FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Subramanian, R Schneibel, JH AF Subramanian, R Schneibel, JH TI FeAl-TiC cermets - melt infiltration processing and mechanical properties SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE iron aluminide; composites; environmental embrittlement; fracture; melt infiltration ID BINDER PHASE; IRON; EMBRITTLEMENT; DEFORMATION; COMPOSITES; TOUGHNESS; FRACTURE AB TiC-based cermets were processed with iron aluminide, an intermetallic, as a binder by pressureless melt infiltration to near full density (>97% theoretical density). Phase equilibria calculations in the quaternary Fe-AI-Ti-C system at 1723 K by Thermocalc (TM) were performed to determine the solubility of TiC in liquid iron aluminide. Results show that molten Fe-40at%Al in equilibrium with T1(0.512)C(0.488) and graphite, dissolves 4.9 at.% carbon and 64 atomic ppm titanium. Due to the low values for the solubility of the carbide phases in liquid iron aluminide, melt infiltration of molten FeA1 into TiC preforms is more successful than conventional liquid phase sintering to process cermets with carbide contents ranging from 70 to 90 vol.%, to greater than 97% of theoretical density. Hardness, bend strength and fracture toughness are reported. SEM observations of fracture surfaces suggest the improved fracture toughness to result from the ductility of the intermetallic phase. Evaluation of room temperature fracture toughnesses showed that relatively high fracture toughnesses (18 MPa m(1/2)) can be obtained with iron aluminide as a binder. A systematic correlation of the ligament sizes with the fracture mode was performed. The results clearly show that FeA1 ligaments larger than about 1.2 mu m fracture by cleavage and those smaller in size fracture predominantly in a ductile manner. Slow crack growth experiments were performed with specimens immersed in water and in an oxygen atmosphere. The extent of environmental embrittlement was evaluated by comparing the work to fracture in water and oxygen, respectively. With additions of more than 20-40 vol.% TiC, the composites showed only small differences in the work of fracture, indicating that environmental embrittlement of iron aluminide is not severe when it is used as a binder in cermets. (C) 1997 Elsevier Science S.A. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Subramanian, R (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. NR 22 TC 26 Z9 31 U1 1 U2 6 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 633 EP 639 DI 10.1016/S0921-5093(97)00641-2 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000088 ER PT J AU Subramanian, R McKamey, CG Buck, LR Schneibel, JH AF Subramanian, R McKamey, CG Buck, LR Schneibel, JH TI Synthesis of iron aluminide-Al2O3 composites by in-situ displacement reactions SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE displacement reactions; iron aluminide matrix; mechanical properties ID SOLID-STATE; FEAL; ALUMINUM; ALLOYS AB Composites consisting of an iron aluminide matrix with ceramic particle reinforcements, such as alumina, could improve the high temperature strength without compromising the oxidation resistance. In this paper, the feasibility of processing Fe-A1 alloy/A1(2)O(3) composites by an in-situ displacement reaction between Fe-40at.%A1 and iron oxide, Fe2O3, is investigated. Simple powder metallurgical processing was performed without resorting to any externally applied pressures or deformations during the high temperature processing step. The microstructural features of the composites are rationalized based on results from diffusion couples. Preliminary mechanical properties such as fracture toughness, yield strength and hardness are determined and compared with the values obtained for monolithic iron aluminide-Fe-28at.%A1. Results suggest that a significant improvement in the properties is needed and further avenues for modifications, such as changes in the interface strength and externally applied forces during processing, are suggested. (C) 1997 Elsevier Science S.A. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Subramanian, R (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. NR 23 TC 24 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 640 EP 646 DI 10.1016/S0921-5093(97)00642-4 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000089 ER PT J AU Abraham, DP Richardson, JW McDeavitt, SM AF Abraham, DP Richardson, JW McDeavitt, SM TI Laves inter-metallics in stainless steel-zirconium alloys SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE heat-treatment; neutron diffraction; compression tests ID PHASES; ZR AB Laves intermetallics have a significant effect on properties of metal waste forms being developed at Argonne National Laboratory. These waste forms are stainless steel-zirconium alloys that will contain radioactive metal isotopes isolated from spent nuclear fuel by electrometallurgical treatment. The baseline waste form composition for stainless steel-clad fuels is stainless steel-15wt.%zirconium (SS-15Zr). This article presents results of neutron diffraction measurements, heat-treatment studies and mechanical testing on SS-15Zr alloys. The Laves intermetallics in these alloys, labeled Zr(Fe,Cr,Ni)(2+x), have both C36 and C15 crystal structures. A fraction of these intermetallics transform into (Fe,Cr,Ni)(2)3Zr(6) during high-temperature annealing; we have proposed a mechanism for this transformation. The SS-15Zr alloys show virtually no elongation in uniaxial tension, but exhibit good strength and ductility in compression tests. This article also presents neutron diffraction and microstructural data for a stainless steel-42wt.%zirconium (SS-42Zr) alloy. (C) 1997 Elsevier Science S.A. C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Abraham, DP (reprint author), Argonne Natl Lab, Div Chem Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 20 TC 30 Z9 30 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 658 EP 664 DI 10.1016/S0921-5093(97)00649-7 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000092 ER PT J AU Jin, Z Gray, GT Kim, YW AF Jin, Z Gray, GT Kim, YW TI Texture evolution during alpha-forging of gamma-TiAl alloys SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE alpha-forging; fiber texture; alloys ID DYNAMIC RECRYSTALLIZATION; DEFORMATION; MECHANISM AB Four gamma-TiAl alloys; Ti-47.0Al-2.0Cr-2.5Nb-0.21W-0.12B, Ti-46.8Al-2.0Cr-4.0Nb-0.30B, Ti-47.0Al-1.7Cr-2.4Nb-0.16W and Ti-46.3Al-1.8Cr-3.0Nb-0.26W-0.2Si-0.10B were forged within the alpha-phase field (alpha-forging) to study the possibility of obtaining aligned microstructures. Pole figures from two locations within each forged plate (near the center and at the rim) were measured and the crystal orientation distribution functions (CODF's) were calculated to evaluate texture evolution during alpha-forging. A general trend toward the formation of a {011}(uvw) fiber texture was observed for all four alloys. The orientation density distribution along the {011}(uvw) fiber texture was found to depend on the alloy, the forging temperature and the radial location within the forged plates. Some scattered individual texture components, which were different in each alloy, were also observed. The observed textures are correlated to the deformation responses of the alloys during alpha-forging. (C) 1997 Elsevier Science S.A. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Universal Energy Syst Inc, Dayton, OH 45432 USA. RP Jin, Z (reprint author), Univ Calif Los Alamos Natl Lab, MS G755, Los Alamos, NM 87545 USA. NR 13 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 729 EP 735 DI 10.1016/S0921-5093(97)00659-X PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000102 ER PT J AU Sikka, VK Loria, EA AF Sikka, VK Loria, EA TI Characteristics of a multicomponent Nb-Ti-Al alloy via industrial-scale practice SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE Nb-Ti-Al alloy; nickel-based superalloy; industrial-scale production AB Within the spectrum of advanced intermetallic materials, an alloy containing 44Nb-35Ti-6A1-5Cr-8V-1W-O.5Mo-0.3Hf (at.%) was investigated in the industrial-scale produced condition. The alloy was tensile tested in air from room temperature to 1000 degrees C and in vacuum at 750 and 850 degrees C. Results of this study have shown that the alloy can be commercially produced and has adequate ductility for its secondary processing even at an oxygen level of 1160 wppm. The alloy has room temperature ductility of 16% and superplastic elongation of 244% at 1000 degrees C. This alloy shows low intermediate temperature (600-850 degrees C) ductility when tested in air. The vacuum testing revealed that the low ductility is associated within oxygen embrittlement phenomenon. It is expected that such an embrittlement can be reduced by an oxidation resistant coating. The alloy also possesses superior strength to similar alloys in this class. Results of this investigation suggest a strong potential for consideration of this alloy to exceed the useful temperature range of nickel-based superalloys. (C) 1997 Elsevier Science S.A. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Reference Met Co, Bridgeville, PA 15017 USA. RP Sikka, VK (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. NR 5 TC 23 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 745 EP 751 DI 10.1016/S0921-5093(97)00662-X PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000105 ER PT J AU Fu, CL Wang, XD AF Fu, CL Wang, XD TI The effect of electronic structure on the defect properties of FeAl SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE defect properties; FeAl; hydrogen-induced embrittlement ID TRANSITION-METAL ALUMINIDES; B2 STRUCTURE; B2-TYPE; EMBRITTLEMENT; TEMPERATURES; HARDNESS AB First-principles local-density-functional calculations have been used to investigate the defect properties of FeAl: (1) the ordering behavior and equilibrium point defects; (2) the binding interactions among vacancies; and (3) the mechanism underlying the hydrogen-induced embrittlement effect. The point defect structure is dominated by substitutional antisite defects on both sublattices and thermal vacancies on the Fe sublattice. It is predicted that the binding between vacancies is strongly attractive when vacancies are aligned along the [100] direction, and becomes weakly repulsive when vacancies are [110]a or [111]a apart (where a is the lattice constant). The binding interaction between vacancies is found to manifest the oscillations in the vacancy-induced charge density on neighboring lattice sites. Energetically, vacancies (and/or vacancy clusters) provide favorable lattice sites for hydrogen segregation. The hydrogen-induced embrittlement is explained in terms of a charge transfer mechanism and the localization behavior of induced charge at the hydrogen site. (C) 1997 Elsevier Science S.A. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Fu, CL (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. NR 19 TC 13 Z9 16 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 761 EP 768 DI 10.1016/S0921-5093(97)00664-3 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000107 ER PT J AU Lee, SB Li, JCM Liu, CT AF Lee, SB Li, JCM Liu, CT TI Pinning of dislocations by solutes in NiAl SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE NiAl; edge dislocation; solute; Cottrell atmosphere ID MECHANICAL-PROPERTIES; DUCTILITY; TENSILE AB Four alloying elements Zr, Hf, B and C added in intermetallic NiAl were found to enhance yield strength. The large increment of yield strength observed cannot be explained by conventional mechanisms such as particle strengthening and solid solution hardening. A new approach based on break away of edge dislocations from Cottrell atmosphere is proposed. The Cottrell atmosphere, as originally proposed for interstitial atoms in the neighborhood of the edge dislocation, is extended for both substitutional and interstitial solutes, with Zr and Hf being substitutional atoms replacing Al and B and C interstitials. This quantitative model yields results in good agreement with the experimental data for the substitutional impurities, but for interstitial solutes the calculated values are smaller than the observed increase in yield stress. The embrittlement of NiAl by these solutes is also discussed in terms of dislocation pinning and the increase of yield stress. (C) 1997 Elsevier Science S.A. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan. Univ Rochester, Dept Mech Engn, Rochester, NY 14627 USA. RP Lee, SB (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 17 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 808 EP 812 DI 10.1016/S0921-5093(97)00670-9 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000113 ER PT J AU Hawk, JA Alman, DE AF Hawk, JA Alman, DE TI Abrasive wear of intermetallic-based alloys and composites SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 4th Conference on High Temperature Intermetallics CY APR 27-MAY 01, 1997 CL SAN DIEGO, CALIFORNIA DE wear behavior; abrasion; intermetallic alloys; intermetallic composites AB In this study, the abrasive wear behavior of Fe3Al, TiAl, Ti3Al, Al3Ti, NiAl, Ni3Al and MoSi2, and composites based on these compounds, were assessed and compared to the behavior of selected metals, alloys and ceramics. Under the wear conditions used for these tests, the softer intermetallic compounds (e.g. TiAl and Fe3Al) behaved in a manner similar to the metals and alloys, whereas, the harder intermetallic compound (i.e. MoSi2) behaved more like a ceramic. The influence of Al atomic fraction, superlattice structure and ternary alloying additions on the wear behavior of Fe3Al was investigated. Controlling the Al content and third element additions affected wear resistance more than superlattice structure. Composite strengthening was also explored as a method for improving wear resistance. The addition of hard second phase particles (i.e. TiB2 to NiAl and SiC to MoSi2) was also very effective improving wear resistance. Surprisingly, the addition of softer Nb particles did not significantly degrade the wear resistance of a MoSi2 matrix, even at Nb additions of 40 degrees. (C) 1997 Elsevier Science S.A. C1 US Dept Energy, Albany Res Ctr, Albany, OR 97321 USA. RP Hawk, JA (reprint author), US Dept Energy, Albany Res Ctr, 1450 Queen Ave SW, Albany, OR 97321 USA. NR 26 TC 60 Z9 61 U1 2 U2 4 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC PY 1997 VL 240 BP 899 EP 906 DI 10.1016/S0921-5093(97)00681-3 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV834 UT WOS:000071868000124 ER PT J AU Adalsteinsson, D Evans, LC Ishii, H AF Adalsteinsson, D Evans, LC Ishii, H TI The level set method for etching and deposition SO MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES LA English DT Article ID VISCOSITY SOLUTIONS; MEAN-CURVATURE; EQUATIONS AB We provide a rigorous interpretation of the level set approach to certain nonlocal geometric motions modelling etching effects in manufacture. The shadowing of certain parts of a surface by other parts gives rise to a nonlocal Hamilton-Jacobi type PDE, with a multivalued Hamiltonian. We also show that deposition effects do not fall within the conventional level set framework, and accordingly must be reinterpreted for numerical implementation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Math, Berkeley, CA 94720 USA. Tokyo Metropolitan Univ, Dept Math, Hachioji, Tokyo 19203, Japan. RP Adalsteinsson, D (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-2025 J9 MATH MOD METH APPL S JI Math. Models Meth. Appl. Sci. PD DEC PY 1997 VL 7 IS 8 BP 1153 EP 1186 DI 10.1142/S0218202597000578 PG 34 WC Mathematics, Applied SC Mathematics GA YM934 UT WOS:000071116500005 ER PT J AU Castillo, JE Otto, JS AF Castillo, JE Otto, JS TI A generalized length strategy for direct optimization in planar grid generation SO MATHEMATICS AND COMPUTERS IN SIMULATION LA English DT Article AB We consider an alternative to conventional grid generation strategies based on the length functional. These conventional strategies include using an inverse mapping (the famous Winslow generator), or augmenting length with other functionals that promote unicity. Both strategies have the drawback that the resulting minimization problem becomes complicated and expensive. As an alternative, we propose a generalized strategy for length which does not use inverse mappings or auxiliary functionals. The strategy, based largely on reference mappings, provides flexibility in controlling grid quality, and its minimization problems can be solved using a simple multigrid algorithm, yielding a grid generation scheme with optimal complexity. C1 San Diego State Univ, Dept Math, San Diego, CA 92812 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Castillo, JE (reprint author), San Diego State Univ, Dept Math, San Diego, CA 92812 USA. NR 12 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4754 J9 MATH COMPUT SIMULAT JI Math. Comput. Simul. PD DEC 1 PY 1997 VL 44 IS 5 BP 441 EP 456 DI 10.1016/S0378-4754(97)00079-7 PG 16 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA YT910 UT WOS:000071658800002 ER PT J AU Zhong, Z AF Zhong, Z TI Bent Laue crystal monochromator for producing areal x-ray beams SO MEDICAL PHYSICS LA English DT Article C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Zhong, Z (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. NR 0 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 USA SN 0094-2405 J9 MED PHYS JI Med. Phys. PD DEC PY 1997 VL 24 IS 12 BP 2055 EP 2055 DI 10.1118/1.598136 PG 1 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA YM376 UT WOS:000071057400027 ER PT J AU Molodkin, VB Olikhovs'ky, SI Kislovs'ky, EN Krivits'ky, VP Los', AV Pervak, EV Ice, JE Larson, BC AF Molodkin, VB Olikhovs'ky, SI Kislovs'ky, EN Krivits'ky, VP Los', AV Pervak, EV Ice, JE Larson, BC TI Interpretation of reflection curves for single crystals with microdefects in the case of the Bragg dynamic diffraction of X-rays SO METALLOFIZIKA I NOVEISHIE TEKHNOLOGII LA Russian DT Article ID ELASTICALLY BENT CRYSTALS; DIFFUSE-SCATTERING; SILICON-CRYSTALS; DEFECTS; PRECIPITATION; EQUATIONS; INTENSITY AB On the base of the dynamical theory of X-ray scattering by real crystals, the theoretical model describing both coherent and diffuse components of the reflection coefficient (RC) in the whole angular range including the total reflection range is developed. The analytical expressions for the RC components are obtained for the Bragg diffraction in single crystals containing randomly distributed microdefects. The coefficient of extinction (due to the diffuse scattering), which is involved in both coherent and diffuse RC components, is connected explicitly with parameters of various-type microdefects. The proposed model enables to consider both small and large microdefects having the radii that are comparable with the extinction length. To test this model, the measurements of RC's from thermally treated Si single crystal have been carried out by using the high-resolution double-crystal X-ray diffractometer. C1 GV Kurdyumov Met Phys Inst, UA-252680 Kiev, Ukraine. Oak Ridge Natl Lab, Oak Ridge, TN USA. NR 37 TC 18 Z9 18 U1 0 U2 0 PU NATL ACAD SCIENCES UKRAINE, INST METAL PHYSICS PI KIEV 142 PA 36 ACADEMICIAN VERNADSKY BLVD, KIEV 142, UKRAINE UA-252180 SN 0204-3580 J9 METALLOFIZ NOV TEKH+ JI Metallofiz. Nov. Tekhnol.-Met. Phys. Adv. Techn. PD DEC PY 1997 VL 19 IS 12 BP 25 EP 34 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA YW439 UT WOS:000071935400004 ER PT J AU Oden, LL Gokcen, NA AF Oden, LL Gokcen, NA TI C-Ni and Al-C-Ni phase diagrams and thermodynamic properties of C in the alloys from 1550 degrees C to 2300 degrees C SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID 1550-DEGREES-C; 2300-DEGREES-C; EQUILIBRIA; SYSTEM AB The C-Ni and Al-C-Ni phase diagrams were determined by chemical analysis of alloys saturated with carbon within sealed graphite crucibles. The solubility of carbon in nickel over the temperature range 1550 degrees C to 2300 degrees C is given by log (at. pct C) = 2.0376 - 1874.68/T, where T is temperature in kelvin. Isothermal sections for the ternary system were determined at intervals of 150 degrees C over the range of temperatures investigated. The univariant points on the 1700 degrees C, 1850 degrees C, and 2000 degrees C isotherms were determined by metallographic examination of rapidly cooled alloys to be about 67.2Al-1.1C-31.7Ni, 70.3Al-2.3C-27.4Ni, and 8.2.5Al-7.0C-10.5Ni, respectively, where all concentrations are in atomic percent. Graphite, Al4C3 (decomposition temperature 2156 degrees C), and AlNi (decomposition temperature 1638 degrees C) were the only solid phases observed within the temperature range investigated. The excess partial Gibbs energy for dissolved C, (G) over bar(2)(e), in liquid Al-C-Ni solutions in equilibrium with C, as calculated from the experimental solubilities and thermodynamic data on Al-Ni, is (G) over bar(2)(e) = -RT ln y = 136,290 - 57.98T + 3.0T ln T + x(2)(-63,170 + 14.4T) + z(2)(-104,716 + 31.76T) + xz[-23,326 + 20.82T + x(-37,040 + 17.22T) + xz(747,390 - 202.02T)] where R is the gas constant and x, y, and z are the atomic fractions of Al, C, and Ni, respectively. The equations for (G) over bar(2)(e) C in equilibrium with Al4C3 have also been obtained for the binary and ternary alloys. C1 US Bur Mines, US Dept Interior, Albany Res Ctr, Albany, OR 97321 USA. NR 16 TC 10 Z9 10 U1 0 U2 11 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD DEC PY 1997 VL 28 IS 12 BP 2453 EP 2458 DI 10.1007/s11661-997-0002-0 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YR348 UT WOS:000071486400002 ER PT J AU Clausen, B Lorentzen, T AF Clausen, B Lorentzen, T TI Experimental evaluation of a polycrystal deformation modeling scheme using neutron diffraction measurements SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID TEXTURE AB The uniaxial behavior of aluminum polycrystals is simulated using a rate-independent incremental self-consistent elastic-plastic polycrystal deformation model, and the results are evaluated by neutron diffraction measurements. The elastic strains deduced from the model show good agreement with the experimental results for the 111 and 220 reflections, whereas the predicted elastic strain level for the 200 reflection is, in general, approximately 10 pct too low in the plastic regime. C1 Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. Riso Natl Lab, Engn Sci Ctr Struct Characterisat & Modelling, DK-4000 Roskilde, Denmark. RP Clausen, B (reprint author), Univ Calif Los Alamos Natl Lab, Lujan Ctr, POB 1663, Los Alamos, NM 87545 USA. RI Clausen, Bjorn/B-3618-2015 OI Clausen, Bjorn/0000-0003-3906-846X NR 9 TC 33 Z9 33 U1 0 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD DEC PY 1997 VL 28 IS 12 BP 2537 EP 2541 DI 10.1007/s11661-997-0011-z PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YR348 UT WOS:000071486400011 ER PT J AU Henshall, GA Strum, MJ Bewlay, BP Sutliff, JA AF Henshall, GA Strum, MJ Bewlay, BP Sutliff, JA TI Ductile-phase toughening in V-V3Si in situ composites SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID FRACTURE-TOUGHNESS; BRITTLE MATERIALS; REINFORCED CERAMICS; INTERMETALLICS; DEFORMATION; INTERFACES; STRENGTH; BEHAVIOR AB This article describes the room-temperature fracture behavior of ductile-phase-toughened V-V3Si in situ composites that were produced by arc melting (AM), cold-crucible induction melting (IM), and cold-crucible directional solidification (DS). Composites were produced containing a wide range of microstructures, interstitial impurity contents, and volume fractions of the ductile V-Si solid solution phase, denoted (V). The fracture toughness of these composites generally increases as the volume fraction of (V) increases, but is strongly influenced by the microstructure, the mechanical properties of the component phases, and the crystallographic orientation of the (V) phase with respect to the maximum principal stress direction. For eutectic composites that have a (V) volume fraction of about 50 pct, the fracture toughness increases with decreasing "effective" interstitial impurity concentration, [I] = [N] + 1.33 [O] + 9 [H]. As [I] decreases from 1400 ppm (AM) to 400 ppm (IM), the fracture toughness of the eutectic composites increases from 10 to 20 MPa root m. Further, the fracture toughness of the DS eutectic composites is greater when the crack propagation direction is perpendicular, rather than parallel, to the composite growth direction. These results are discussed in light of conventional ductile-phase bridging theories, which alone cannot fully explain the fracture toughness of V-Si in situ composites. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. GE, Schenectady, NY 12301 USA. RP Henshall, GA (reprint author), Hewlett Packard Co, 3500 Deer Creek Rd, Palo Alto, CA 94304 USA. NR 34 TC 12 Z9 12 U1 0 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD DEC PY 1997 VL 28 IS 12 BP 2555 EP 2564 DI 10.1007/s11661-997-0013-x PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YR348 UT WOS:000071486400013 ER PT J AU Kolman, DG Scully, JR AF Kolman, DG Scully, JR TI Understanding the potential and pH dependency of high-strength beta-titanium alloy environmental crack-initiation SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID AQUEOUS CHLORIDE SOLUTIONS; HYDROGEN; ELECTROCHEMISTRY; REPASSIVATION; TEMPERATURE; KINETICS; TI; PASSIVITY; DIFFUSION; SURFACES AB An explanation for the strong dependency of crack initiation of precracked high-strength beta-titanium alloy's in room-temperature 0.6 M NaCl on applied potential and bulk-solution pH is presented. It is proposed that environment-assisted cracking (EAC) susceptibility in neutral aqueous NaCl results from (1) film rupture due to plastic deformation at actively deformed crack tips, (2) accelerated dissolution of titanium, (3) crack tip acidification by hydrolysis of titanium ions, (4) crack tip potential excursions toward bare metal open-circuit potentials (OCPs) during film rupture due to large ohmic voltages in the crack solution, (5) accelerated crack tip proton or water reduction concurrent with titanium dissolution, (6) bare surface-dominated hydrogen ingress into a fracture process zone, and (7) crack initiation by hydrogen embrittlement. Evidence for each of the above stages of the crack initiation scenario is presented, with emphasis on crack tip electrode kinetics and ohmic voltage calculations which govern process zone-controlled hydrogen uptake. The seven stages are consistent with the strong dependencies of crack initiation and growth in precracked high-strength beta-titanium alloys on (1) solution pH, (2) applied potential, and (3) strain rate, and they explain the "apparent" EAC resistance of smooth- and blunt-notch specimens. The latter lack both occluded crack tip geometries to promote acidification and ohmic voltage drops below reversible hydrogen, as well as localization of dynamic plastic strain. Hydrogen uptake is, subsequently, limited. C1 Univ Calif Los Alamos Natl Lab, Mat Corros & Environm Effects Lab, Tech Staff, Los Alamos, NM 87545 USA. Univ Virginia, Ctr Electrochem Sci & Engn, Dept Mat Sci & Engn, Charlottesville, VA 22903 USA. Univ Virginia, Ctr Electrochem Sci & Engn, Dept Mat Sci & Engn, Charlottesville, VA 22903 USA. RP Kolman, DG (reprint author), Univ Virginia, Ctr Electrochem Sci & Engn, Dept Mat Sci & Engn, Charlottesville, VA 22903 USA. NR 62 TC 13 Z9 13 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD DEC PY 1997 VL 28 IS 12 BP 2645 EP 2656 DI 10.1007/s11661-997-0021-x PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YR348 UT WOS:000071486400021 ER PT J AU Jordan, CE Zuhr, R Marder, AR AF Jordan, CE Zuhr, R Marder, AR TI Effect of phosphorous surface segregation on iron-zinc reaction kinetics during hot-dip galvanizing SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID STEEL AB Phosphorous was ion implanted on one surface of a large grain (10 to 20 mm) low-carbon steel sheet in order to study the effect of surface segregation on the formation of Fe-Zn phases during galvanizing. Both an Al-free and a 0.20 wt pct Al-Zn bath at 450 degrees C were used in this investigation. It was found that P surface segregation did not affect the kinetics of Fe-Zn phase growth for the total alloy layer or the individual Fe-Zn gamma, delta, and zeta phase alloy layers in the 0.00 wt pct Al-Zn baths. In the 0.20 wt pct Al-Zn bath, the Fe2Al5 inhibition layer formed with kinetics, showing linear growth on both the P-ion implanted and non-P-ion implanted surfaces. Fe-Zn phase growth only occurred after extended reaction times on both surfaces and was found to directly correspond to the location of substrate grain boundary sites. These results indicate that P surface segregation does not affect the growth of Fe-Zn phases or the Fe2Al5 inhibition layer. It was shown that in the 0.20 wt pct Al-Zn bath, substrate grain boundaries are the dominant steel substrate structural feature that controls the kinetics of Fe-Zn alloy phase growth. C1 Lockheed Martin, Knowles Atom Power Lab, Schenectady, NY 12301 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Lehigh Univ, Dept Mat Sci & Engn, Bethlehem, PA 18015 USA. RP Jordan, CE (reprint author), Lockheed Martin, Knowles Atom Power Lab, Schenectady, NY 12301 USA. NR 15 TC 30 Z9 31 U1 3 U2 7 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD DEC PY 1997 VL 28 IS 12 BP 2695 EP 2703 DI 10.1007/s11661-997-0026-5 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YR348 UT WOS:000071486400026 ER PT J AU Gourishankar, KV Johnson, GK Johnson, I AF Gourishankar, KV Johnson, GK Johnson, I TI Thermodynamics of mixed oxide compounds, Li2O center dot Ln(2)O(3) (Ln = Nd or Ce) SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article ID LI8CEO6 AB The thermodynamics of mixed oxide compounds of the type Li2O . Ln(2)O(3) (Ln = Nd or Ce) has been studied by measuring the lanthanide content of molten LiCl-Li2O-Li solutions in equilibrium with the solid mixed oxide compound at 923 K. The observed total lanthanide mole fraction in the molten salt when in equilibrium with both solid Ln(2)O(3) and LiLnO(2) was found to be 1.0 x 10(-4) and 5.9 x 10(-4) for Ln = Nd and Ce, respectively. The calculated mole fractions of LiLnO(2) in the molten salt when the solid mixed oxide compound was present are 2.6 x 10(-5) and 2.1 x 10(-4) for LiNdO2 and LiCeO2, respectively. The unexpectedly large "solubilities" of the sesquioxides in the presence of Li2O can be explained by the formation of complex oxide species, LiLnO(2) and Li(3)LnO(3), in the molten salt solutions. The equilibrium constants and the free energies of formation for these species were derived from the measured data. The free energies of formation of the solid mixed oxide compounds at 923K were found to be -1014 +/- 1.5 kJ/mol for LiNdO2 and -1006 +/- 11.0 kJ/mol for LiCeO2. C1 Argonne Natl Lab, Div Chem Technol, Pyrochem Proc Applicat Grp, Argonne, IL 60439 USA. RP Gourishankar, KV (reprint author), Argonne Natl Lab, Div Chem Technol, Pyrochem Proc Applicat Grp, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 19 TC 8 Z9 8 U1 1 U2 15 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 DEC PY 1997 VL 28 IS 6 BP 1103 EP 1110 DI 10.1007/s11663-997-0066-7 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YT939 UT WOS:000071661700017 ER PT J AU Powell, A Van den Avyle, J Damkroger, B Szekely, J Pal, U AF Powell, A Van den Avyle, J Damkroger, B Szekely, J Pal, U TI Analysis of multicomponent evaporation in electron beam melting and refining of titanium alloys SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article AB Experimental evidence and a mathematical model are presented to evaluate the effect of beam-scan frequency on composition change in electron-beam melting of titanium alloys. Experiments characterized the evaporation rate of commercially pure (CP) titanium and vapor composition over titanium alloy with up to 6 wt pet aluminum and 4.5 wt pet vanadium, as a function of beam power, scan frequency; and background pressure. These data and thermal mapping of the hearth melt surface are used to estimate activity coefficients of aluminum and vanadium in the hearth. The model describes transient heat transfer in the surface of the melt and provides a means of estimating enhancement of pure titanium evaporation and change in final aluminum composition due to local heating at moderate beam-scan frequencies. C1 MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA. Sandia Natl Labs, Mat Joining Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Dept Mat Proc, Albuquerque, NM 87185 USA. RP Powell, A (reprint author), MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA. NR 27 TC 32 Z9 38 U1 0 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 DEC PY 1997 VL 28 IS 6 BP 1227 EP 1239 DI 10.1007/s11663-997-0078-3 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA YT939 UT WOS:000071661700029 ER PT J AU Stubbs, L Carver, EA Cacheiro, NLA Shelby, M Generoso, W AF Stubbs, L Carver, EA Cacheiro, NLA Shelby, M Generoso, W TI Generation and characterization of heritable reciprocal translocations in mice SO METHODS LA English DT Article ID BALANCED TRANSLOCATION; DOMINANT LETHAL; MUTATIONS; GENE; IDENTIFICATION; BREAKPOINT; LOCUS; MODEL AB Reciprocal translocations have provided crucial tools for the localization of genes associated with a variety of human cancers and hereditary diseases. Although heritable translocations are relatively rare in humans, they can be easily induced in mice through exposure of male germ cells at specific spermatogenic stages to different types of radiation and chemicals. Mutagenesis schemes that produce translocations at high frequencies in the progeny of treated males are summarized, and the use of these valuable mutations for analyzing developmental consequences of partial aneuploidy, for identification of mutant genes, and for other purposes is reviewed. Preliminary studies of a large collection of translocation mutants, including several stocks that display dominantly or recessively inherited phenotypes caused by the disruption of critical genes are described. These combined studies demonstrate that several mutagenesis protocols can be used to generate easily mapped, novel mouse mutations with high efficiency and highlight the unique value of reciprocal translocations as tools for gaining access to the biological functions of mammalian genes. (C) 1997 Academic Press. C1 Univ Tennessee, Div Life Sci, Grad Sch Biomed Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. NIEHS, Res Triangle Pk, NC 27709 USA. RP Stubbs, L (reprint author), Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, 7000 East Ave,L-452, Livermore, CA 94550 USA. EM Stubbs5@llnl.gov OI Stubbs, Lisa/0000-0002-9556-1972 FU NIEHS NIH HHS [Y01-ES-20085] NR 50 TC 11 Z9 12 U1 1 U2 2 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1046-2023 J9 METHODS JI Methods PD DEC PY 1997 VL 13 IS 4 BP 397 EP 408 DI 10.1006/meth.1997.0546 PG 12 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YZ446 UT WOS:000072254900007 PM 9480784 ER PT J AU Justice, MJ Zheng, B Woychik, RP Bradley, A AF Justice, MJ Zheng, B Woychik, RP Bradley, A TI Using targeted large deletions and high-efficiency N-ethyl-N-nitrosourea mutagenesis for functional analyses of the mammalian genome SO METHODS-A COMPANION TO METHODS IN ENZYMOLOGY LA English DT Article ID DROSOPHILA-MELANOGASTER; MOUSE CHROMOSOME-7; LETHAL MUTATIONS; LARVAL CUTICLE; ZYGOTIC LOCI; ETHYLNITROSOUREA MUTAGENESIS; POSITIONAL CLONING; TRANSGENIC MICE; QUAKING LOCUS; X-CHROMOSOME AB The Human Genome Project has generated nucleotide sequences from an estimated 80,000 to 100,000 genes, only a small fraction of which have a known role. Nucleotide sequence information alone is insufficient to predict gene function. One of the most powerful ways of revealing gene function, as demonstrated in bacteria, worms, yeast, and flies, is to generate mutations and characterize them at both the phenotypic and the molecular levels. Given the physiological and anatomical parallels between mouse and human, genotype-phenotype relationships established in mice can be extrapolated to human syndromes. A new method is described for functional genetic analyses in the mouse that uses IoxP/Cre engineering to generate coat color-tagged large deletions. The haploid regions can then be dissected by mutagenesis with N-ethyl-N-nitrosourea in phenotype-driven screens to obtain functional information on genes in any desired region of the mouse genome. (C) 1997 Academic Press. C1 Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37830 USA. Baylor Coll Med, Howard Hughes Med Inst, Houston, TX 77030 USA. Case Western Reserve Univ, Rainbow Babies & Childrens Hosp, Cleveland, OH 44106 USA. RP Justice, MJ (reprint author), Oak Ridge Natl Lab, Div Life Sci, POB 2008, Oak Ridge, TN 37830 USA. NR 60 TC 65 Z9 68 U1 0 U2 0 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1046-2023 J9 METHODS JI Methods PD DEC PY 1997 VL 13 IS 4 BP 423 EP 436 DI 10.1006/meth.1997.0548 PG 14 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YZ446 UT WOS:000072254900009 PM 9480786 ER PT J AU Lacks, SA AF Lacks, SA TI Cloning and expression of pneumococcal genes in Streptococcus pneumoniae SO MICROBIAL DRUG RESISTANCE-MECHANISMS EPIDEMIOLOGY AND DISEASE LA English DT Article ID MISMATCH-REPAIR GENE; POLYACRYLAMIDE-GEL-ELECTROPHORESIS; DPNII DNA METHYLASE; ESCHERICHIA-COLI; DEOXYRIBONUCLEIC-ACID; DIPLOCOCCUS-PNEUMONIAE; RECOMBINANT PLASMIDS; BACILLUS-SUBTILIS; SALMONELLA-TYPHIMURIUM; NUCLEOTIDE-SEQUENCE AB An overview of gene cloning in Streptococcus pneumoniae is presented. The advantages of such cloning, especially for pneumococcal genes, are enumerated. The molecular fate of DNA in transformation of S. pneumoniae, in particular, the conversion of DNA to single-strand segments on entry, determines the mechanisms for plasmid establishment and interaction with the chromosome. One of these mechanisms, the chromosomal facilitation of plasmid establishment, is useful for obtaining recombinant plasmids and for introducing an allele from the chromosome into a plasmid. The difference between linear and circular synapsis of donor DNA strands with the chromosome is illustrated. Circular synapsis can give rise to circular integration, which is useful for insertional mutagenesis of chromosomal genes, for coupled cloning in Escherichia coli, and for sequential cloning of DNA along the pneumococcal chromosome. Cloning in S. pneumoniae is not notably affected by DNA mismatch repair or restriction systems in the host cell. Unusual features of gene expression in S. pneumoniae are discussed. Transcription begins most often at promoters with extended -10 sequences, and in a small but significant number of cases, translation does not require a ribosome-binding site with a Shine-Dalgarno sequence. C1 Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Lacks, SA (reprint author), Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. FU NIAID NIH HHS [AI14885] NR 90 TC 9 Z9 9 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 USA SN 1076-6294 J9 MICROB DRUG RESIST JI Microb. Drug Resist.-Mechan. Epidemiol. Dis. PD WIN PY 1997 VL 3 IS 4 BP 327 EP 337 DI 10.1089/mdr.1997.3.327 PG 11 WC Infectious Diseases; Microbiology; Pharmacology & Pharmacy SC Infectious Diseases; Microbiology; Pharmacology & Pharmacy GA YN692 UT WOS:000071196200004 PM 9442484 ER PT J AU Dunne, C Crowley, JJ Moenne-Loccoz, Y Dowling, DN de Bruijn, FJ O'Gara, F AF Dunne, C Crowley, JJ Moenne-Loccoz, Y Dowling, DN de Bruijn, FJ O'Gara, F TI Biological control of Pythium ultimum by Stenotrophomonas maltophilia W81 is mediated by an extracellular proteolytic activity SO MICROBIOLOGY-UK LA English DT Article DE biological control; Pythium ultimum; sugar beet; Stenotrophomonas maltophilia; protease ID GRAM-NEGATIVE BACTERIA; PSEUDOMONAS-FLUORESCENS CHA0; BLACK ROOT-ROT; XANTHOMONAS-MALTOPHILIA; PLANT-PATHOGENS; METABOLITE 2,4-DIACETYLPHLOROGLUCINOL; TRICHODERMA-HARZIANUM; MOLECULAR MECHANISMS; FUSARIUM-WILT; STRAIN AB Stenotrophomonas maltophilia strain W81, isolated from the rhizosphere of field-grown sugar beet, produced the extracellular enzymes chitinase and protease and inhibited the growth of the phytopathogenic fungus Pythium ultimum in vitro. The role of these lytic enzymes in the interaction between W81 and P. ultimum was investigated using Tn5 insertion mutants of W81 incapable of producing extracellular protease (W81M1), extracellular chitinase (W81M2) or the two enzymes (W81A1). Lytic enzyme activity was restored in W81A1 following introduction of a 15 kb cosmid-borne fragment of W81 genomic DNA. Incubation of P. ultimum in the presence of commercial purified protease or cell-free supernatants from cultures of wild-type W81, the chitinase-negative mutant W81M2 or the complemented derivative W81A1(pCU800) resulted in hyphal lysis and loss of subsequent fungal growth ability once re-inoculated onto fresh plates. In contrast, commercial purified chitinase or cell-free supernatants from cultures of the protease-negative mutant W81M1 or the chitinase-and protease-negative mutant W81A1 had no effect on integrity of the essentially chitin-free Pythium mycelium, and did not prevent subsequent growth of the fungus. in soil microcosms containing soil naturally infested by Pythium spp., strains W81, W81M2 and W81A1(pCU800) reduced the ability of Pythium spp. to colonize the seeds of sugar beet and improved plant: emergence compared with the untreated control, whereas W81A1 and W81M1 failed to protect sugar beet from damping-off. Wild-type W81 and its mutant derivatives colonized the rhizosphere of sugar beet to similar extents. It was concluded that the ability of S. maltophilia W81 to protect sugar beet from Pythium-mediated damping-off was due to the production of an extracellular protease. C1 Natl Univ Ireland Univ Coll Cork, Dept Microbiol, Cork, Ireland. Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. Michigan State Univ, Dept Microbiol, E Lansing, MI 48824 USA. RP O'Gara, F (reprint author), Natl Univ Ireland Univ Coll Cork, Dept Microbiol, Cork, Ireland. RI dowling, david/A-6249-2010 OI dowling, david/0000-0001-6952-5495 NR 67 TC 91 Z9 98 U1 1 U2 7 PU SOC GENERAL MICROBIOLOGY PI READING PA MARLBOROUGH HOUSE, BASINGSTOKE RD, SPENCERS WOODS, READING, BERKS, ENGLAND RG7 1AE SN 1350-0872 J9 MICROBIOL-UK JI Microbiology-(UK) PD DEC PY 1997 VL 143 BP 3921 EP 3931 PN 12 PG 11 WC Microbiology SC Microbiology GA YM496 UT WOS:000071069300026 ER PT J AU Egert, CM Hylton, KW AF Egert, CM Hylton, KW TI Automated array assembly: a high throughput, low cost assembly process for LIGA-fabricated micro-components SO MICROSYSTEM TECHNOLOGIES LA English DT Article; Proceedings Paper CT International Conference on High Aspect Ratio Microstructure Technology (HARMST 97) CY JUN 20-21, 1997 CL MADISON, WISCONSIN AB The development of a viable LIGA-based micro-manufacturing capability requires the assembly of discrete micro-components into more complex devices. The size and tolerances of micro-components preclude the direct use of traditional macroscopic assembly process to micro-device manufacturing. Instead specific micro-assembly technologies must be developed and validated for producing complex micro-systems. Automated array assembly, a high throughput, low cost approach to micro-assembly, uses specialized fixtures allowing an array of micro-components to be picked-up and inserted into a corresponding array of devices using automated and highly accurate positioning stages. Assembly rates are measured here for insertion assembly experiments using automated array assembly and these rates compared with manual assembly rates. These results show that the automated array approach can assemble micro-components with rates at least an order of magnitude greater than manual assembly rates. C1 Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN 37831 USA. RP Egert, CM (reprint author), Oak Ridge Natl Lab, Engn Technol Div, Bear Creek Rd, Oak Ridge, TN 37831 USA. NR 1 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0946-7076 J9 MICROSYST TECHNOL JI Microsyst. Technol. PD DEC PY 1997 VL 4 IS 1 BP 25 EP 27 DI 10.1007/s005420050086 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Science & Technology - Other Topics; Materials Science; Physics GA YN076 UT WOS:000071130700007 ER PT J AU Stampfer, MR Bodnar, A Garbe, J Wong, M Pan, A Villeponteau, B Yaswen, P AF Stampfer, MR Bodnar, A Garbe, J Wong, M Pan, A Villeponteau, B Yaswen, P TI Gradual phenotypic conversion associated with immortalization of cultured human mammary epithelial cells SO MOLECULAR BIOLOGY OF THE CELL LA English DT Article ID GROWTH-FACTOR-BETA; HUMAN BREAST-CANCER; TELOMERASE ACTIVITY; TRANSFORMATION; SENESCENCE; INDUCTION; LINES; PROLIFERATION; EXPRESSION; MECHANISM AB Examination of the process of immortal transformation in early passages of two human mammary epithelial cell (HMEC) lines suggests the involvement of an epigenetic step. These lines, 184A1 and 184B5, arose after in vitro exposure of finite lifespan 184 HMEC to a chemical carcinogen, and both are clonally derived. Although early-passage mass cultures of 184A1 and 184B5 maintained continuous slow growth, most individual cells lost proliferative ability. Uniform good growth did not occur until 20-30 passages after the lines first appeared. Early-passage cultures expressed little or no telomerase activity and telomeres continued to shorten with increasing passage. Telomerase activity was first detected when the telomeres became critically short, and activity levels gradually increased thereafter. Early-passage cultures had little or no ability to maintain growth in transforming growth factor-beta (TGF beta); however, both mass cultures and clonal isolates showed a very gradual increase in the number of cells displaying progressively increased ability to maintain growth in TGF beta. A strong correlation between capacity to maintain growth in the presence of TGF beta and expression of telomerase activity was observed. We have used the term ''conversion'' to describe this process of gradual acquisition of increased growth capacity in the absence or presence of TGF beta and reactivation of telomerase. We speculate that the development of extremely short telomeres may result in gradual, epigenetic-based changes in gene expression. Understanding the underlying mechanisms of HMEC conversion in vitro may provide new insight into the process of carcinogenic progression in vivo and offer novel modes for therapeutic intervention. C1 GERON CORP,MENLO PK,CA 94025. RP Stampfer, MR (reprint author), LAWRENCE BERKELEY NATL LAB,1 CYCLOTRON RD,BLDG 934,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA-24844] NR 45 TC 50 Z9 52 U1 0 U2 5 PU AMER SOC CELL BIOLOGY PI BETHESDA PA PUBL OFFICE, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD DEC PY 1997 VL 8 IS 12 BP 2391 EP 2405 PG 15 WC Cell Biology SC Cell Biology GA YK930 UT WOS:A1997YK93000003 PM 9398663 ER PT J AU Dumaz, N Duthu, A Ehrhart, JC Drougard, C Appella, E Anderson, CW May, P Sarasin, A Daya-Grosjean, L AF Dumaz, N Duthu, A Ehrhart, JC Drougard, C Appella, E Anderson, CW May, P Sarasin, A Daya-Grosjean, L TI Prolonged p53 protein accumulation in trichothiodystrophy fibroblasts dependent on unrepaired pyrimidine dimers on the transcribed strands of cellular genes SO MOLECULAR CARCINOGENESIS LA English DT Article DE DNA repair; p53; WAF1; GADD45; ultraviolet light ID TUMOR-SUPPRESSOR PROTEIN; DNA-DAMAGING AGENTS; C-TERMINAL DOMAIN; WILD-TYPE P53; XERODERMA-PIGMENTOSUM; ATAXIA-TELANGIECTASIA; NUCLEAR ACCUMULATION; G(1) ARREST; SKIN TUMORS; REPAIR AB Trichothiodistrophy (TTD), xeroderma pigmentosum (XP), and Cockayne's syndrome (CS) are three distinct human diseases with sensitivity to ultraviolet (UV) radiation affected by mutations in genes involved in nucleotide excision repair (NER). Among the many responses of human cells to UV irradiation, both nuclear accumulation of p53, a tumor suppressor protein, and alterations in cell-cycle checkpoints play crucial roles. The purpose of this study was to define the signals transmitted after UV-C-induced DNA damage, which activates p53 accumulation in TTD/XP-D fibroblasts, and compare this with XP-D cell lines that carry different mutations in the same gene, XPD. Our results showed that p53 was rapidly induced in the nuclei of TTD/XP-D and XP-D fibroblasts in a dose-dependent manner after UV-C irradiation, as seen in XP-A and CS-A fibroblasts, much lower doses being required for the protein accumulation than in normal human fibroblasts, XP variant cells, and XP-C cells. The kinetics of accumulation of p53 and two effector proteins involved in cell-cycle arrest, WAF1 a nd GAD D45, were also directly related to the repair potential of the cells, as in normal human fibroblasts the ir levels declined after 24 h, the time required for repair of UV-induced lesions, whereas NER-deficient TTD/XP-D cells showed p53, WAF1, and GADD45 accumulation for over 72 h after irradiation. Our results indicate that p53 accumulation followed by transcriptional activation of genes implicated in growth arrest is triggered in TTD/XP-D cells by the persistence of cyclobutane pyrimidine dimers, which are known to block transcription, on the transcribed strands of active genes. (C) 1997 Wiley-Liss, Inc. C1 Inst Rech Canc, Genet Mol Lab, Inst Federat, CNRS 1, F-94801 Villejuif, France. NCI, Cell Biol Lab, Bethesda, MD 20892 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Daya-Grosjean, L (reprint author), Inst Rech Canc, Genet Mol Lab, Inst Federat, CNRS 1, IFC1,7 Rue Guy Moquet, F-94801 Villejuif, France. RI Dumaz, Nicolas/B-5907-2008 OI Dumaz, Nicolas/0000-0003-3511-2160 NR 49 TC 59 Z9 60 U1 0 U2 2 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0899-1987 J9 MOL CARCINOGEN JI Mol. Carcinog. PD DEC PY 1997 VL 20 IS 4 BP 340 EP 347 DI 10.1002/(SICI)1098-2744(199712)20:4<340::AID-MC3>3.0.CO;2-N PG 8 WC Biochemistry & Molecular Biology; Oncology SC Biochemistry & Molecular Biology; Oncology GA YQ402 UT WOS:000071383200003 PM 9433478 ER PT J AU Huang, DB Chang, CH Ainsworth, C Johnson, G Solomon, A Stevens, FJ Schiffer, M AF Huang, DB Chang, CH Ainsworth, C Johnson, G Solomon, A Stevens, FJ Schiffer, M TI Variable domain structure of kappa IV human light chain Len: High homology to the murine light chain McPC603 SO MOLECULAR IMMUNOLOGY LA English DT Article DE immunoglobulin; humanization; amyloid; protein stability; x-ray diffraction ID IMMUNOGLOBULIN DEPOSITION; MONOCLONAL-ANTIBODY; MOLECULAR-STRUCTURE; PROTEIN STRUCTURES; X-RAY; CRYSTAL; BINDING; GENES; REFINEMENT; RESOLUTION AB Antibody light chains of the kappa subgroup are the predominant light chain component in human immune responses and are used almost exclusively in the antibody repertoire of mice. Human kappa light chains comprise four subgroups. To date, all crystallographic studies of human kappa light chains were carried out on proteins of the kappa I subgroup. The light chain produced by multiple myeloma patient Len, was of the kappa IV subgroup, it differed by only one residue from the germ-line gene encoded protein. The variable domain fragment of the light chain was crystallized from ammonium sulfate in space group C222(1). The crystal structure was determined by molecular replacement and refined at 1.95 Angstrom resolution to an R-factor of 0.15. Protein Len has six additional residues in its CDR1 segment compared to the kappa I proteins previously characterized. The kappa IV variable domain, Len, differs in only 23 of 113 residues from murine kappa light chain McPC603. The RMS deviation upon superimposing their alpha-carbons was 0.69 Angstrom. The CDRI segment of the human and murine variable domains have the same length and conformation although their amino acid sequences differ in 5 out of 17 residues. Structural features were identified that could account for the significantly higher stability of the human kappa IV protein relative to its murine counterpart. This human kappa IV light chain structure is the closest human homolog to a murine light chain and can be expected to facilitate detailed structural comparisons necessary for effective humanization of murine antibodies. (C) 1998 Published by Elsevier Science Ltd. All rights reserved. C1 Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, Argonne, IL 60439 USA. Univ Tennessee, Med Ctr, Grad Sch Med, Dept Med,Human Immunol & Canc Program, Knoxville, TN 37920 USA. RP Schiffer, M (reprint author), Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, 9700 S Cass Ave, Argonne, IL 60439 USA. FU NCI NIH HHS [CA 10056]; NIDDK NIH HHS [DK43757] NR 49 TC 32 Z9 32 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0161-5890 J9 MOL IMMUNOL JI Mol. Immunol. PD DEC PY 1997 VL 34 IS 18 BP 1291 EP 1301 DI 10.1016/S0161-5890(98)00002-9 PG 11 WC Biochemistry & Molecular Biology; Immunology SC Biochemistry & Molecular Biology; Immunology GA ZW544 UT WOS:000074421600007 PM 9683271 ER PT J AU Ewsuk, KG AF Ewsuk, KG TI Compaction science and technology SO MRS BULLETIN LA English DT Article RP Ewsuk, KG (reprint author), SANDIA NATL LABS,MS 1349,1001 UNIV BLVD,ALBUQUERQUE,NM 87106, USA. NR 0 TC 12 Z9 12 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1997 VL 22 IS 12 BP 14 EP 16 PG 3 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA YL346 UT WOS:A1997YL34600019 ER PT J AU Glass, SJ Ewsuk, KG AF Glass, SJ Ewsuk, KG TI Ceramic powder compaction SO MRS BULLETIN LA English DT Article ID DENSITY; DIE RP Glass, SJ (reprint author), SANDIA NATL LABS,ORG 1833,MS 0367,ALBUQUERQUE,NM 87185, USA. NR 41 TC 29 Z9 29 U1 2 U2 7 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1997 VL 22 IS 12 BP 24 EP 28 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA YL346 UT WOS:A1997YL34600021 ER PT J AU Blumenthal, WR Sheinberg, H Bingert, SA AF Blumenthal, WR Sheinberg, H Bingert, SA TI Compaction issues in powder metallurgy SO MRS BULLETIN LA English DT Article ID SIMULATION; DIE RP Blumenthal, WR (reprint author), LOS ALAMOS NATL LAB,MS G755,LOS ALAMOS,NM 87545, USA. NR 32 TC 4 Z9 4 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1997 VL 22 IS 12 BP 29 EP 33 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA YL346 UT WOS:A1997YL34600022 ER PT J AU Harrison, L Ascione, AG Takiguchi, Y Wilson, DM Chen, DJ Demple, B AF Harrison, L Ascione, AG Takiguchi, Y Wilson, DM Chen, DJ Demple, B TI Comparison of the promoters of the mouse (APEX) and human (APE) apurinic endonuclease genes SO MUTATION RESEARCH-DNA REPAIR LA English DT Article DE DNA repair; abasic site; transcription; development; redox regulation ID DNA-REPAIR ENZYME; COLI EXONUCLEASE-III; MESSENGER-RNA; DIHYDROFOLATE-REDUCTASE; CHROMOSOMAL ASSIGNMENT; EXTRACELLULAR CALCIUM; REDOX FACTOR; EXPRESSION; NUCLEASE; PROTEIN AB We investigated the minimal promoter of APEX, which encodes mouse apurinic DNA repair endonuclease. A 1.85-kb fragment with APEX upstream sequences and similar to 290 bp of the transcribed region linked to a chloramphenicol acetyltransferase (CAT) reporter gene was assayed by transient transfection in NIH-3T3 cells. The minimal APEX promoter was comprised of similar to 190 bp of upstream and similar to 170 bp of transcribed DNA (exon 1 and most of intron 1). This similar to 360-bp region contains two CCAAT boxes and other consensus protein binding sites, but no TATA box. Deletion of the 5'-most CCAAT box decreased activity similar to 5-fold. The second CCAAT box (situated in exon 1) may play an independent role in APEX expression. Transcription start sites have been identified downstream of the second CCAAT box, and DNase I footprinting demonstrated NIH-3T3 nuclear proteins binding this region, including an Sp1 site located between the CCAAT boxes. Electrophoretic mobility-shift assays indicated binding by purified Sp1. Mouse proteins did not bind three myc-like (USF) sites in the APEX promoter, in contrast to the APE promoter. The APEX and APE promoter had similar activity in Hela cells, but in mouse cells, the murine promoter had similar to 5-fold higher activity than did the human promoter, Both the APEX and APE promoters exhibited bidirectional activity in their cognate cells. (C) 1997 Elsevier Science B.V. C1 Harvard Univ, Sch Publ Hlth, Dept Canc Cell Biol, Boston, MA 02115 USA. Univ Calif Los Alamos Natl Lab, Div Life Sci, DNA Damage & Repair Grp, Los Alamos, NM USA. RP Demple, B (reprint author), Harvard Univ, Sch Publ Hlth, Dept Canc Cell Biol, 665 Huntington Ave, Boston, MA 02115 USA. FU NCI NIH HHS [CA50519]; NIGMS NIH HHS [GM40000] NR 42 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8777 J9 MUTAT RES-DNA REPAIR JI Mutat. Res.-DNA Repair PD DEC PY 1997 VL 385 IS 3 BP 159 EP 172 DI 10.1016/S0921-8777(97)00053-0 PG 14 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology GA YZ141 UT WOS:000072224400001 PM 9506886 ER PT J AU Erlandsen, H Fusetti, F Martinez, A Hough, E Flatmark, T Stevens, RC AF Erlandsen, H Fusetti, F Martinez, A Hough, E Flatmark, T Stevens, RC TI Crystal structure of the catalytic domain of human phenylalanine hydroxylase reveals the structural basis for phenylketonuria SO NATURE STRUCTURAL BIOLOGY LA English DT Letter ID AMINO-ACID HYDROXYLASES; MISSENSE MUTATIONS; PROTEIN STRUCTURES; BINDING-SITES; ACTIVE-SITE; PROGRAM; IRON; 4-MONOOXYGENASE; LOCUS AB The 2.0 Angstrom crystal structure of the catalytic domain of human phenylalanine hydroxylase reveals a fold similar to that of tyrosine hydroxylase. It provides the first structural view of where mutations occur and a rationale to explain molecular mechanisms of the enzymatic phenotypes in the autosomal recessive disorder phenylketoneuria. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV TROMSO,INST MATH & PHYS SCI,PROT CRYSTALLOG GRP,DEPT CHEM,N-9037 TROMSO,NORWAY. LAWRENCE BERKELEY LAB,PHYS BIOSCI DIV,BERKELEY,CA 94720. UNIV BERGEN,DEPT BIOCHEM & MOL BIOL,N-5009 BERGEN,NORWAY. RI Stevens, Raymond/K-7272-2015; OI Stevens, Raymond/0000-0002-4522-8725; Martinez, Aurora/0000-0003-1643-6506 NR 41 TC 168 Z9 171 U1 2 U2 18 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1072-8368 J9 NAT STRUCT BIOL JI Nat. Struct. Biol. PD DEC PY 1997 VL 4 IS 12 BP 995 EP 1000 DI 10.1038/nsb1297-995 PG 6 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA YK578 UT WOS:A1997YK57800011 PM 9406548 ER PT J AU Schuff, N Amend, D Ezekiel, F Steinman, SK Tanabe, J Norman, D Jagust, W Kramer, JH Mastrianni, JA Fein, G Weiner, MW AF Schuff, N Amend, D Ezekiel, F Steinman, SK Tanabe, J Norman, D Jagust, W Kramer, JH Mastrianni, JA Fein, G Weiner, MW TI Changes of hippocampal N-acetyl aspartate and volume in Alzheimer's disease - A proton MR spectroscopic imaging and MRI study SO NEUROLOGY LA English DT Article ID MAGNETIC-RESONANCE SPECTROSCOPY; ISCHEMIC VASCULAR DEMENTIA; TEMPORAL-LOBE EPILEPSY; WHITE-MATTER; BRAIN; DIAGNOSIS; IMAGES; ACETYLASPARTATE; ATROPHY; NEURONS AB Hippocampal atrophy detected by MRI is a prominent feature of early Alzheimer's disease (AD), but it is likely that MRI underestimates the degree of hippocampal neuron loss, because reactive gliosis attenuates atrophy. We tested the hypothesis that hippocampal N-acetyl aspartate (NAA; a neuronal marker) and Volume used together provide greater discrimination between AD and normal elderly than does either measure alone. We used proton MR spectroscopic imaging (H-1 MRSI) and tissue segmented and volumetric MR images to measure atrophy-corrected hippocampal NAA and volumes in 12 AD patients (mild to moderate severity) and 17 control subjects of comparable age. In AD, atrophy-corrected NAA from the hippocampal region was reduced by 15.5% on the right and 16.2% on the left (both p <0.003), and hippocampal volumes were smaller by 20.1% (p <0.003) on the right and 21.8% (p <0.001) on the left when compared with control subjects. The NAA reductions and volume losses made independent contributions to the discrimination of AD patients from control subjects. When used separately, neither hippocampal NAA nor volume achieved to classify correctly AD patients better than 80%. When used together, however, the two measures correctly classified 90% of AD patients and 94% of control subjects. In conclusion, hippocampal NAA measured by H-1 MRSI combined with quantitative measurements of hippocampal atrophy by MRI may improve diagnosis of AD. C1 DVA Med Ctr, MR Unit, San Francisco, CA 94121 USA. Univ Calif San Francisco, Dept Radiol, San Francisco, CA 94143 USA. Univ Calif San Francisco, Dept Psychiat, San Francisco, CA 94143 USA. Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA. Univ Calif Davis, Dept Neurol, Davis, CA USA. Univ Calif Davis, Lawrence Berkeley Lab, Ctr Funct Imaging, Davis, CA USA. RP Schuff, N (reprint author), DVA Med Ctr, MR Unit, 4150 Clement St,114M, San Francisco, CA 94121 USA. FU NIA NIH HHS [P01AG12435, R01AG10897, AG10129] NR 41 TC 158 Z9 165 U1 0 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 USA SN 0028-3878 J9 NEUROLOGY JI Neurology PD DEC PY 1997 VL 49 IS 6 BP 1513 EP 1521 PG 9 WC Clinical Neurology SC Neurosciences & Neurology GA YL495 UT WOS:000070961600005 PM 9409338 ER PT J AU Fritschy, JM Benke, D Johnson, DK Mohler, H Rudolph, U AF Fritschy, JM Benke, D Johnson, DK Mohler, H Rudolph, U TI GABA(A)-receptor alpha-subunit is an essential prerequisite for receptor formation in vivo SO NEUROSCIENCE LA English DT Article DE GABA(A)-receptor subunit assembly; subunit gene; benzodiazepine binding site; chromosomal deletion; p locus ID AMINOBUTYRIC-ACID RECEPTOR; UNIQUE PHARMACOLOGICAL PROPERTIES; A RECEPTORS; BENZODIAZEPINE RECEPTORS; CLEFT-PALATE; RAT-BRAIN; SUBTYPES; LOCALIZATION; MICE; MOUSE AB The mechanisms governing the assembly of alpha-, beta- and gamma-subunits to form GABA(A)-receptors are poorly understood. Here, we report that the alpha-subunit is essential for receptor assembly. In mice homozygous for a deletion on chromosome 7 spanning the alpha 5- and gamma 3-subunit genes,(7) zolpidem-insensitive benzodiazepine binding sites, corresponding to GABA(A)-receptors containing the alpha 5-subunit, were absent in the hippocampus. This loss of alpha 5-GABA(A)-receptor binding was also apparent as a 21% decrease in the total number of benzodiazepine binding sites in the hippocampus. In addition, immunoreactivity for the beta 2,3- and gamma 2-subunit was decreased exclusively in neurons which normally express the alpha 5-subunit, such as olfactory bulb granule cells and hippocampal pyramidal cells. In other brain regions of the mutants, the beta 2,3- and gamma 2-subunit staining was unaffected. Controls included two lines of mice homozygous for a shorter chromosomal deletion, that either included or excluded the gamma 3-subunit gene. These two lines were indistinguishable with regard to numbers of benzodiazepine binding sites and levels alpha 5-, beta 2,3- and gamma 2-subunit immunoreactivity, indicating that the lack of gamma 3-subunit gene did not contribute to the observed deficit in receptor formation. These results demonstrate that the absence of the alpha 5-subunit gene prevents the formation of the entire respective receptor complex in adult mouse brain. Thus, the alpha-subunit, unlike the gamma 2-subunit, might play a major role in the assembly or targeting of GABA(A)-receptor complexes. (C) 1997 IBRO. Published by Elsevier Science Ltd. C1 OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. RP Fritschy, JM (reprint author), UNIV ZURICH, INST PHARMACOL, CH-8057 ZURICH, SWITZERLAND. NR 31 TC 46 Z9 46 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4522 J9 NEUROSCIENCE JI Neuroscience PD DEC PY 1997 VL 81 IS 4 BP 1043 EP 1053 DI 10.1016/S0306-4522(97)00244-3 PG 11 WC Neurosciences SC Neurosciences & Neurology GA XY724 UT WOS:A1997XY72400013 PM 9330366 ER PT J AU Galperin, EA Kansa, EJ Makroglou, A Nelson, SA AF Galperin, EA Kansa, EJ Makroglou, A Nelson, SA TI Mathematical programming methods in the numerical solution of Volterra integral and integro-differential equations with weakly-singular kernel SO NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS LA English DT Article; Proceedings Paper CT 2nd World Congress of Nonlinear Analysis CY JUL 10-17, 1996 CL ATHENS, GREECE SP Int Federat Nonlinear Analysts ID POSITIVE DEFINITE FUNCTIONS; 2ND KIND; COLLOCATION METHODS; INTEGRODIFFERENTIAL EQUATIONS; PRODUCT INTEGRATION; NONSMOOTH SOLUTIONS; MULTIQUADRIC INTERPOLATION; SPLINE COLLOCATION; SCATTERED DATA; HALF-LINE AB Nonlinear Volterra integral and integro-differential equations with weakly-singular kernel are considered and solved numerically using nonlinear Mathematical programming methods based on minimax approximations. In both cases polynomial and multiquadric approximation are used. C1 Univ Quebec, Dept Math & Informat, Montreal, PQ H3C 3P8, Canada. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Portsmouth, Sch Math Studies, Portsmouth PO1 2EG, Hants, England. Iowa State Univ, Ames, IA 50011 USA. RP Galperin, EA (reprint author), Univ Quebec, Dept Math & Informat, Case Postale 8888,Succursale A, Montreal, PQ H3C 3P8, Canada. NR 65 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0362-546X J9 NONLINEAR ANAL-THEOR JI Nonlinear Anal.-Theory Methods Appl. PD DEC PY 1997 VL 30 IS 3 BP 1505 EP 1513 DI 10.1016/S0362-546X(96)00340-9 PG 9 WC Mathematics, Applied; Mathematics SC Mathematics GA YV497 UT WOS:000071831000023 ER PT J AU Kim, KH Lee, DB Kim, CK Hofman, GL Paik, KW AF Kim, KH Lee, DB Kim, CK Hofman, GL Paik, KW TI Thermal compatibility of centrifugally atomized U-Mo powders with aluminium in a dispersion fuel SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID TEST REACTORS AB The thermal compatibility of centrifugally atomized U-Mo alloys with aluminum has been studied. Samples of extruded dispersions of 24 vol.% spherical U-2 wt.% Mo and U-10 wt.% Mo powders in an aluminum matrix were annealed for over 2000 h at 400 degrees C. No significant dimensional changes occurred in the U-10 wt.% Mo/aluminum dispersions. The U-2 wt.% Mo/aluminum dispersion, however, increased in volume by 26% after 2000 h at 400 degrees C. This large volume change is mainly due to the formation of voids and cracks resulting from nearly complete interdiffusion of U-Mo and aluminum. Interdiffusion between U-10 wt.% Mo and aluminum was found to be minimal. The different diffusion behavior is primarily due to the fact that U-2 wt.% Mo decomposes from an as-atomized metastable gamma-phase (bcc) solid solution into the equilibrium alpha-U and U2Mo two-phase structure during the experiment, whereas U-10 wt.% Mo retains the metastable gamma-phase structure throughout the 2000 h anneal and thereby displays superior thermal compatibility with aluminum compared to U-2 wt.% Mo. (C) 1997 Elsevier Science S.A. C1 Korea Atom Energy Res Inst, Res Reactor Dev Project, Taejon 305353, South Korea. Argonne Natl Lab, Argonne, IL 60439 USA. Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea. RP Kim, KH (reprint author), Korea Atom Energy Res Inst, Res Reactor Dev Project, Taejon 305353, South Korea. NR 16 TC 11 Z9 11 U1 2 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD DEC PY 1997 VL 178 IS 1 BP 111 EP 117 DI 10.1016/S0029-5493(97)00216-1 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YV006 UT WOS:000071779100009 ER PT J AU Snelgrove, JL Hofman, GL Meyer, MK Trybus, CL Wiencek, TC AF Snelgrove, JL Hofman, GL Meyer, MK Trybus, CL Wiencek, TC TI Development of very-high-density low-enriched-uranium fuels SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Following a hiatus of several years and following its successful development and qualification of 4.8 g U cm(-3) U3Si2-Al dispersion fuel for application with low-enriched uranium in research and test reactors, the US Reduced Enrichment for Research and Test Reactors program has embarked on the development of even-higher-density fuels. Our goal is to achieve uranium densities of 8-9 g cm(-3) in aluminum-based dispersion fuels, Achieving this goal will require the use of high-density, gamma-stabilized uranium alloy powders in conjunction with the most-advanced fuel fabrication techniques. Key issues being addressed are the reaction of the fuel alloys with aluminum and the irradiation behavior of the fuel alloys and any reaction products. Test irradiations of candidate fuels in very-small (micro) plates are scheduled to begin in the Advanced Test Reactor during June, 1997. Initial results are expected to be available in early 1998. We are performing out-of-reactor studies on the phase structure of the candidate alloys on diffusion of the matrix material into the aluminum. In addition, we are modifying our current dispersion fuel irradiation behavior model to accommodate the new fuels. Several international partners are participating in various phases of this work. (C) 1997 Elsevier Science S.A. C1 Argonne Natl Lab, RERTR Program, Argonne, IL 60439 USA. RP Snelgrove, JL (reprint author), Argonne Natl Lab, RERTR Program, 9700 S Cass Ave,Bldg 207, Argonne, IL 60439 USA. OI Meyer, Mitchell/0000-0002-1980-7862 NR 16 TC 120 Z9 120 U1 4 U2 14 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD DEC PY 1997 VL 178 IS 1 BP 119 EP 126 DI 10.1016/S0029-5493(97)00217-3 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YV006 UT WOS:000071779100010 ER PT J AU Sulfredge, CD AF Sulfredge, CD TI Flow excursion time scales in the advanced neutron source reactor SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 7th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NEURETH-7) - Thermal-Hydraulics for the 21st-Century CY SEP 10-15, 1995 CL SARATOGA SPRINGS, NEW YORK SP Amer Nucl Soc, Amer Inst Chem Engineers, Amer Soc Mech Engineers, Canadian Nucl Soc, European Nucl Soc, Atom Energy Soc Japan, Japanese Soc Multiphase Flow, US Nuclear Regulatory Commiss AB Flow excursion transients give rise to a key thermal limit for the proposed advanced neutron source (ANS) reactor because its core involves many parallel flow channels with a common pressure drop. Since one can envision certain accident scenarios in which the thermal limits set by flow excursion correlations might be exceeded for brief intervals, a key objective is to determine how long a flow excursion would take to bring about a system failure that could lead to fuel damage. The anticipated time scale for flow excursions has been examined by subdividing the process into its component phenomena: bubble formation, flow deceleration, and fuel plate heat-up. Models were developed to estimate the time required for each individual stage. Accident scenarios involving sudden reduction in core flow or core exit pressure have been examined, and the models compared with RELAPS output for the ANS geometry. For a high-performance reactor such as the ANS, flow excursion time scales were predicted to be in the millisecond range, so that even very brief transients might lead to fuel damage. These results have been useful for determining the significance of momentary flow excursion events calculated for accident situations in the ANS reactor. In addition, the methods presented are applicable for evaluating the timing of flow excursion transients in other facilities as well. (C) 1997 Elsevier Science S.A. C1 Lockheed Martin Energy Res Corp, Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Sulfredge, CD (reprint author), Lockheed Martin Energy Res Corp, Oak Ridge Natl Lab, Bldg 9204-1,MS-8045, Oak Ridge, TN 37831 USA. EM ufo@ornl.gov NR 15 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD DEC PY 1997 VL 177 IS 1-3 BP 131 EP 145 DI 10.1016/S0029-5493(97)00190-8 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YU454 UT WOS:000071719000012 ER PT J AU Shapira, D Lewis, TA Mosher, JL AF Shapira, D Lewis, TA Mosher, JL TI A three dimensional beam profile monitor based on residual and trace gas ionization SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID STORAGE-RINGS AB A three dimensional beam profile monitor based on tracking the ionization of the residual gas molecules in the evacuated beam pipe is described. Tracking in position and time of the ions and electrons produced in the ionization enables simultaneous position sampling in three dimensions. Special features which make it possible to sample very low beam currents were employed. The characteristics of this detector make it particularly suitable for sampling beams produced at radioactive beam facilities, provided an auxiliary gas feed can be utilized. RP Shapira, D (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 16 TC 11 Z9 11 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 DEC 1 PY 1997 VL 400 IS 2-3 BP 185 EP 194 DI 10.1016/S0168-9002(97)01054-1 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900001 ER PT J AU Liu, H AF Liu, H TI Space-charge effects on bunching of electrons in the CEBAF injector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID FEL INJECTOR; DESIGN AB The main injector for the 4 GeV CEBAF accelerator al Thomas Jefferson National Accelerator Facility was designed to deliver simultaneously three CW electron beams for nuclear physics research. The maximum design current for a single beam from the injector is 100 mu A, or 0.2 pC per microbunch at a repetition rate of 499 MHz. It was found through computer simulation that space charge even at a subpicocoulomb level can spoil the bunching of electrons significantly, and some unexpected phenomena observed experimentally could be explained accordingly. This problem arises because of the low-momentum tilt allowed for bunching to preserve low-momentum spread. In this paper, we analyze in detail the space-charge effects on bunching of electrons with the CEBAF injector as an example. Conditions for effective matching of longitudinal phase space in the presence of space charge are discussed. RP Liu, H (reprint author), THOMAS JEFFERSON NATL ACCELERATOR FACIL,12000 JEFFERSON AVE,NEWPORT NEWS,VA 23606, USA. NR 20 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 213 EP 223 DI 10.1016/S0168-9002(97)00960-1 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900003 ER PT J AU Bosze, E SimonGillo, J Boissevain, J Chang, J Seto, R AF Bosze, E SimonGillo, J Boissevain, J Chang, J Seto, R TI Rohacell foam as a silicon support structure material for the PHENIX multiplicity vertex detector SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Rohacell [1], a low-density rigid foam, has been investigated as a support structure material for silicon strip detectors in the Multiplicity Vertex Detector (MVD) in the PHENIX experiment. Although Rohacell is susceptible to changes in humidity, tests have shown that it is an acceptable material for the MVD silicon support structure. The advantage of using Rohacell is that it offers a mechanically robust structure in which secondary interactions are minimized. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. RI seto, richard/G-8467-2011 NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 224 EP 232 DI 10.1016/S0168-9002(97)00982-0 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900004 ER PT J AU Akchurin, N Ayan, S Bencze, GL Chikin, K Cohn, H Doulas, S Dumanoglu, I Eskut, E Fenyvesi, A Ferrando, A Fouz, MC Gavrilov, V Gershtein, Y Hajdu, C Iosifidis, J Josa, MI Khan, A Kim, SB Kolosov, V Kuleshov, S Langland, J Litvintsev, D Merlo, JP Molnar, J Nikitin, A Onel, Y Onengut, G Osborne, D OzdesKoca, N Penzo, A Pesen, E Podrasky, V Rosowsky, A Salicio, JM Sanzeni, C Sever, R Silvestri, H Stolin, V Sulak, L Sullivan, J Ulyanov, A Umashev, A Uzunian, S Veres, G Vesztergombi, G Winn, D Winsor, R Zalan, P Zeyrek, M AF Akchurin, N Ayan, S Bencze, GL Chikin, K Cohn, H Doulas, S Dumanoglu, I Eskut, E Fenyvesi, A Ferrando, A Fouz, MC Gavrilov, V Gershtein, Y Hajdu, C Iosifidis, J Josa, MI Khan, A Kim, SB Kolosov, V Kuleshov, S Langland, J Litvintsev, D Merlo, JP Molnar, J Nikitin, A Onel, Y Onengut, G Osborne, D OzdesKoca, N Penzo, A Pesen, E Podrasky, V Rosowsky, A Salicio, JM Sanzeni, C Sever, R Silvestri, H Stolin, V Sulak, L Sullivan, J Ulyanov, A Umashev, A Uzunian, S Veres, G Vesztergombi, G Winn, D Winsor, R Zalan, P Zeyrek, M TI Test beam of a quartz-fibre calorimeter prototype with a passive front section SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We present test-beam data analysis of a quartzfibre calorimeter prototype composed of a single active section with a passive absorber in front of it. The partial suppression of the electromagnetic showers leads to the equalization of the response to electrons and pions for a given depth of this passive section. Results are compared with the Monte-Carlo expectations. C1 CIEMAT,E-28040 MADRID,SPAIN. MIDDLE E TECH UNIV,TR-06531 ANKARA,TURKEY. RMKI,KFKI,BUDAPEST,HUNGARY. ITEP,MOSCOW,RUSSIA. OAK RIDGE NATL LAB,OAK RIDGE,TN. BOSTON UNIV,BOSTON,MA 02215. CUKUROVA UNIV,ADANA,TURKEY. ATOMKI,DEBRECEN,HUNGARY. FAIRFIELD UNIV,FAIRFIELD,CT 06430. UNIV TRIESTE,TRIESTE,ITALY. IST NAZL FIS NUCL,SEZ TRIESTE,TRIESTE,ITALY. UNIV IOWA,IOWA CITY,IA 52242. RI Kuleshov, Sergey/D-9940-2013; Kim, Soo-Bong/B-7061-2014; Josa, Isabel/K-5184-2014; Pesen, Erhan/B-1753-2017; OI Kuleshov, Sergey/0000-0002-3065-326X; Uliyanov, Alexey/0000-0001-6935-8949; Gershtein, Yuri/0000-0002-4871-5449 NR 13 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 267 EP 278 DI 10.1016/S0168-9002(97)01003-6 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900008 ER PT J AU Bellwied, R Beuttenmuller, R Chen, W DiMassimo, D Dou, L Dyke, H French, A Hall, JR Hoffmann, GW Humanic, TJ Kotov, IV Kraner, HW Li, Z Liaw, CJ Lopez, J Lynn, D Rykov, VL Pandey, SU Pruneau, C Schambach, J Sedlmeir, J Sugarbaker, E Takahashi, J Wilson, WK AF Bellwied, R Beuttenmuller, R Chen, W DiMassimo, D Dou, L Dyke, H French, A Hall, JR Hoffmann, GW Humanic, TJ Kotov, IV Kraner, HW Li, Z Liaw, CJ Lopez, J Lynn, D Rykov, VL Pandey, SU Pruneau, C Schambach, J Sedlmeir, J Sugarbaker, E Takahashi, J Wilson, WK TI Anode region design and focusing properties of STAR silicon drift detectors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Electron collection at the anodes of large-area silicon drift detectors was studied with STAR2 prototypes, Results of measurements of anode leakage currents, signal dependence on focusing voltages, anode uniformity, and model simulations are reported. A design of the anode region is presented, The design optimization is discussed. C1 OHIO STATE UNIV,COLUMBUS,OH 43210. WAYNE STATE UNIV,DETROIT,MI 48201. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV TEXAS,AUSTIN,TX 78712. IHEP,RU-148284 PROTVINO,MOSCOW REGION,RUSSIA. UNIV SAO PAULO,BR-05508 SAO PAULO,BRAZIL. RI Takahashi, Jun/B-2946-2012 OI Takahashi, Jun/0000-0002-4091-1779 NR 8 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 279 EP 286 DI 10.1016/S0168-9002(97)01030-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900009 ER PT J AU Abe, K Arodzero, A Baltay, C Brau, JE Breidenbach, M Burrows, PN Chou, AS Crawford, G Damerell, CJS Dervan, PJ Dong, DN Emmet, W English, RL Etzion, E Foss, M Frey, R Haller, G Hasuko, K Hertzbach, SS Hoeflich, J Huffer, ME Jackson, DJ Jaros, JA Kelsey, J Lee, I Lia, V Lintern, AL Liu, MX Manly, SL Masuda, H McKemey, AK Moore, TB Nichols, A Nagamine, T Oishi, N Osborne, LS Russell, JJ Ross, D Serbo, VV Sinev, NB Sinnott, J Skarpaas, K Smy, MB Snyder, JA Strauss, MG Dong, S Suekane, F Taylor, FE Trandafir, AI Usher, T Verdier, R Watts, SJ Weiss, ER Yashima, J Yuta, H Zapalac, G AF Abe, K Arodzero, A Baltay, C Brau, JE Breidenbach, M Burrows, PN Chou, AS Crawford, G Damerell, CJS Dervan, PJ Dong, DN Emmet, W English, RL Etzion, E Foss, M Frey, R Haller, G Hasuko, K Hertzbach, SS Hoeflich, J Huffer, ME Jackson, DJ Jaros, JA Kelsey, J Lee, I Lia, V Lintern, AL Liu, MX Manly, SL Masuda, H McKemey, AK Moore, TB Nichols, A Nagamine, T Oishi, N Osborne, LS Russell, JJ Ross, D Serbo, VV Sinev, NB Sinnott, J Skarpaas, K Smy, MB Snyder, JA Strauss, MG Dong, S Suekane, F Taylor, FE Trandafir, AI Usher, T Verdier, R Watts, SJ Weiss, ER Yashima, J Yuta, H Zapalac, G TI Design and performance of the SLD vertex detector: a 307 Mpixel tracking system SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE vertex detector; particle tracking; pixels; charge-coupled device (CCD) heavy flavour; charm quark; bottom quark; tau lepton ID CHARGE-COUPLED-DEVICES; PRECISION; DAMAGE AB This paper describes the design, construction, and initial operation of SLD's upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total of 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements of charged particle tracks with a typical precision of 4 mu m in each co-ordinate. The CCDs are arranged in three concentric cylinders just outside the beam-pipe which surrounds the e(+)e(-) collision point of the SLAG Linear Collider (SLC). The detector is a powerful tool for distinguishing displaced vertex tracks, produced by decay inflight of heavy flavour hadrons or tau leptons, from tracks produced at the primary event vertex. The requirements for this detector include a very low mass structure (to minimize multiple scattering) both for mechanical support and to provide signal paths for the CCDs; operation at love temperature with a high degree of mechanical. stability: and high speed CCD readout, signal processing, and data sparsification. The lessons learned in achieving these goals should be useful for the construction of large arrays of CCDs or active pixel devices in the future in a number of areas of science and technology. C1 RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. TOHOKU UNIV,SENDAI,MIYAGI 98077,JAPAN. UNIV OREGON,EUGENE,OR 97403. YALE UNIV,NEW HAVEN,CT 06511. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. MIT,CAMBRIDGE,MA 02139. BRUNEL UNIV,UXBRIDGE UB8 3PM,MIDDX,ENGLAND. UNIV MASSACHUSETTS,AMHERST,MA 01003. NAGOYA UNIV,NAGOYA,AICHI 464,JAPAN. UNIV WISCONSIN,MADISON,WI 53706. COLORADO STATE UNIV,FT COLLINS,CO 80523. UNIV WASHINGTON,SEATTLE,WA 98195. RI Frey, Raymond/E-2830-2016 OI Frey, Raymond/0000-0003-0341-2636 NR 27 TC 94 Z9 94 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 287 EP 343 DI 10.1016/S0168-9002(97)01011-5 PG 57 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900010 ER PT J AU Charlton, LA Barnes, JM Gabriel, TA Johnson, JO Carpenter, JM Crawford, RK AF Charlton, LA Barnes, JM Gabriel, TA Johnson, JO Carpenter, JM Crawford, RK TI Initial neutronic target station studies for the national spallation neutron source (NSNS) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE spallation source; moderators; neutronic calculations AB Results found during initial NSNS target station neutronic design efforts are reported including the success of comparing neutron sources at 1 eV and moderator performance normalized to 1 I:V. The usefulness of an analytic form is demonstrated. The angular dependence of the neutron current from a moderator face is presented together with the changes in neutron current with variation of moderator width, poison plate location and moderator material. The formation of an equilibrium state at low neutron energy is also discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP Charlton, LA (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 9 TC 3 Z9 3 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 DEC 1 PY 1997 VL 400 IS 2-3 BP 419 EP 427 DI 10.1016/S0168-9002(97)01009-7 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900020 ER PT J AU Fernandez, PB Graber, T Lee, WK Mills, DM Rogers, CS Assoufid, L AF Fernandez, PB Graber, T Lee, WK Mills, DM Rogers, CS Assoufid, L TI Test of a high-heat-load double-crystal diamond monochromator at the Advanced Photon Source SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE high-heat-flux x-ray optics; diamond monochromator; synchrotron radiation ID SILICON MONOCHROMATOR; OPTICS AB We have tested the first diamond double-crystal monochromator at the Advanced Photon Source (APS), The monochromator consisted of two synthetic type Ib (1 1 1) diamond plates in symmetric Bragg geometry. The single-crystal plates were 6 mm x 5 mm x 0.25 mm and 6 mm x 5 mm x 0.37 mm and showed a combination of mosaic spread/strain of the order of 2-4 arcsec over a central 1.4 mm-wide strip. The monochromator first crystal was indirectly cooled by edge contact with a water-cooled copper holder. We studied the performance of the monochromator under the high-power X-ray beam delivered by the APS undulator A. By changing the undulator gap, we varied the power incident on the first crystal and found no indication of thermal distortions or strains even at the highest incident Power (200 W) and power density (108 W/mm(2) in normal incidence). The calculated maximum power and power density absorbed by the first crystal were 14.5 W and 2.4 W/mm(2), respectively. We also compared the maximum intensity delivered by this monochromator and by a silicon (1 1 1) cryogenically cooled monochromator. For energies in the range 6-10 keV, the flux through the diamond monochromator was about a factor of two less than through the silicon monochromator, in good agreement with calculations. We conclude that water-cooled diamond monochromators can handle the high-power beams from the undulator beamlines at the APS. As single-crystal diamond plates of larger size and better quality become available, the use of diamond monochromators will become a very attractive option. RP Fernandez, PB (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,EXPT FACILITIES DIV,ARGONNE,IL 60439, USA. NR 10 TC 24 Z9 24 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1997 VL 400 IS 2-3 BP 476 EP 483 DI 10.1016/S0168-9002(97)01014-0 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK079 UT WOS:A1997YK07900027 ER PT J AU Chen, LX Rajh, T Micic, O Wang, ZY Tiede, DM Thurnauer, M AF Chen, LX Rajh, T Micic, O Wang, ZY Tiede, DM Thurnauer, M TI Photocatalytic reduction of heavy metal ions on derivatized titanium dioxide nano-particle surface studied by XAFS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH ID AQUEOUS SUSPENSIONS; DEPOSITION; CYSTEINE AB Photoreduction of heavy metal ions, Cu2+ and Hg2+, on TiO2 nano-particle surfaces, has been investigated by XAFS measurements. The effects of TiO2 surface modification reagents on the reaction efficiency have been studied. We observed a significant reaction efficiency enhancement when amino acid alanine was added to a mixture of 0.01M Cu2+ and TiO2 nano-particles. Fifty percent of the adsorbed Cu2+ has been reduced to Cu-0 after 1-h illumination with a UV-enhanced xenon lamp. Photoreduction of Hg2+ on TiO2 colloid surfaces was also investigated without and with thiolactic acid (TLA). In this case, the photoreduction efficiency for Hg2+ was lowered. Structures of metal ion surroundings in various complexes as well as their role in photoreduction of metal ions are discussed. (C) 1997 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Chen, LX (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 12 TC 12 Z9 12 U1 0 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 DEC PY 1997 VL 133 IS 1-4 BP 8 EP 14 DI 10.1016/S0168-583X(97)00546-6 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800003 ER PT J AU Suzuya, K Price, DL Saboungi, ML Ohno, H AF Suzuya, K Price, DL Saboungi, ML Ohno, H TI Intermediate-range order in lead metasilicate glass SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH DE intermediate-range order; anomalous X-ray scattering ID STRUCTURAL-ANALYSIS; MOLECULAR-DYNAMICS; SILICATE GLASS; SCATTERING; GESE2 AB The complementarity of anomalous X-ray scattering (AXS) and neutron diffraction (ND) techniques is used here to investigate the nature and origin of intermediate-range order in lead metasilicate glass. Both X-ray and neutron structure factors reveal small peaks at low wave vector which are shown to be associated with intermediate-range order of the Pb-O network. The combination of AXS and ND is shown to be a powerful tool to correlate contributions from the different atom pairs to such a peak. The information thus derived is compared with results from alkali germanate glasses and with structural data on corresponding crystalline compounds. (C) 1997 Elsevier Science B.V. C1 Japan Atom Energy Res Inst, Kansai Res Estab, Dept Synchrotron Radiat Facil Project, Ako, Hyogo 67812, Japan. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Suzuya, K (reprint author), Japan Atom Energy Res Inst, Kansai Res Estab, Dept Synchrotron Radiat Facil Project, Ako, Hyogo 67812, Japan. RI Price, David Long/A-8468-2013; Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 21 TC 16 Z9 16 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 DEC PY 1997 VL 133 IS 1-4 BP 57 EP 61 DI 10.1016/S0168-583X(97)00549-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800011 ER PT J AU Terry, J Mo, R Wigren, C Cao, RY Mount, G Pianetta, P Linford, MR Chidsey, CED AF Terry, J Mo, R Wigren, C Cao, RY Mount, G Pianetta, P Linford, MR Chidsey, CED TI Reactivity of the H-Si (111) surface SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH ID LANGMUIR-BLODGETT MONOLAYERS; ELECTRONIC-STRUCTURE; ALKYL MONOLAYERS; PHOTOEMISSION; CHEMISORPTION; ORIENTATION; SI(111); SILICON AB The H-Si (111) surface has been well characterized [Hricovini et al., Phys. Rev. Lett. 70 (1993) 1992], so the reactivity of this surface was studied. H-Si (111) surfaces exposed to Cl-2, Br-2, and 1-alkenes were studied with photoemission spectroscopy. These particular compounds were chosen because of their importance in semiconductor processing and surface functionalization. The observation of the growth of a Si 2p component at high binding energy, characteristic of halogen reactivity, confirmed that bromine and chlorine gases both reacted with the H-Si (111) surface. Reactions with 1-alkenes were confirmed by measuring both the Si 2p and the C 1s core level spectra. The C 2s-based molecular orbitals in the valence band revealed the identity of the alkyl monolayer on the Si (111) surface. Therefore, we found that the H-Si (111) surface, under certain conditions, was reactive. (C) 1997 Elsevier Science B.V. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Stanford Univ, Dept Chem, Stanford, CA 94305 USA. RP Terry, J (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663,MST-5, Los Alamos, NM 87545 USA. NR 30 TC 54 Z9 55 U1 0 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 DEC PY 1997 VL 133 IS 1-4 BP 94 EP 101 DI 10.1016/S0168-583X(97)00467-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800018 ER PT J AU Bunker, BA Kropf, AJ Kemner, KM Mayanovic, RA Lu, Q AF Bunker, BA Kropf, AJ Kemner, KM Mayanovic, RA Lu, Q TI XAFS and X-ray reflectivity studies of buried interfaces SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH ID ABSORPTION FINE-STRUCTURE; MOLECULAR-BEAM EPITAXY; SURFACE; ZNTE/CDSE; ANISOTROPY AB Many of the properties of materials are not due to single-crystal properties, but rather the structure and behavior of internal interfaces. Unlike a free surface, however, there are few ways to nondestructively probe these "buried" interfaces. Here, results are presented on several systems, including semiconductor heterointerfaces exhibiting complex reconstruction, and internal interfaces in metals and semiconductors showing anisotropic atomic motion, In discussing these results, it is shown how X-ray Absorption Fine-structure Spectroscopy (XAFS), X-ray diffraction, and X-ray reflectivity measurements complement one another. (C) 1997 Published by Elsevier Science B.V. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. SW Missouri State Univ, Dept Phys & Astron, Springfield, MO 65804 USA. RP Bunker, BA (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RI Kropf, Arthur/B-8665-2015 NR 20 TC 2 Z9 2 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 DEC PY 1997 VL 133 IS 1-4 BP 102 EP 108 DI 10.1016/S0168-583X(97)00469-2 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800019 ER PT J AU Melendres, CA Bowmaker, GA Leger, JM Beden, B AF Melendres, CA Bowmaker, GA Leger, JM Beden, B TI Synchrotron far infrared spectroscopy of surface films on a copper electrode in aqueous solutions SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH DE synchrotron source; infrared reflection-absorption spectra; spectroelectrochemical behaviour of copper; synchrotron far IR spectroscopy ID INSITU RAMAN-SPECTROSCOPY; SILVER; GOLD; CUO AB Far infrared (IR) spectra of the surface films on copper have been obtained "in situ" in aqueous solution environments using a synchrotron source. The oxide film on copper at 0.05 V vs. SCE in 0.1 M NaOH solution has been identified as Cu2O. In the passive region at 0.3 V, CuO and Cu(OH)(2) appear to be present on the surface. In dilute solutions of KOCN in perchlorate, vibrational bands have been observed that could be attributed to a few monolayers of Cu(OCN)(2). (C) 1997 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. Univ Auckland, Dept Chem, Auckland, New Zealand. Univ Poitiers, CNRS, Chem Lab, Poitiers, France. Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Melendres, CA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI LEGER, Jean-Michel/D-1125-2013 OI LEGER, Jean-Michel/0000-0002-9879-5029 NR 13 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1997 VL 133 IS 1-4 BP 109 EP 113 DI 10.1016/S0168-583X(97)00539-9 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800020 ER PT J AU Gofron, KJ Lee, PL Jennings, G Beno, M Kimball, CW Montano, PA AF Gofron, KJ Lee, PL Jennings, G Beno, M Kimball, CW Montano, PA TI Magnetic circular X-ray dichroism at an energy dispersive beamline at NSLS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96) CY JUL 29-AUG 02, 1996 CL ILLNOIS INST TECHNOL, KENT LAW SCH, CHICAGO, ILLINOIS SP Ctr Synchrotron Rad Res & Instrumentat HO ILLNOIS INST TECHNOL, KENT LAW SCH ID ABSORPTION AB An energy dispersive beamline at NSLS was modified to allow magnetic circular X-ray dichroism studies. The description of the apparatus is given. The new, much more stable, arrangement is tested and compared with the previous one. The data acquistion sequence is described. The polarization of the X-ray beam has been characterized by Compton polarimetry. Examples of the magnetic systems studied by MCXD are shown. Limitations of the experimental arrangement setup for energies above 10 keV are discussed. (C) 1997 Published by Elsevier Science B.V. C1 Argonne Natl Lab, Argonne, IL 60439 USA. No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. RP Gofron, KJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 0 Z9 0 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 DEC PY 1997 VL 133 IS 1-4 BP 114 EP 119 DI 10.1016/S0168-583X(97)00542-9 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YQ783 UT WOS:000071422800021 ER PT J AU Gyulassy, M Pang, Y Zhang, B AF Gyulassy, M Pang, Y Zhang, B TI Transverse energy evolution as a test of parton cascade models SO NUCLEAR PHYSICS A LA English DT Article DE parton cascade; hydrodynamics; QCD transport theory; nuclear collisions ID HEAVY-ION COLLISIONS; NUCLEUS NUCLEUS COLLISIONS; QUARK-GLUON-PLASMA; HADRONIC-INTERACTIONS; QCD; HYDRODYNAMICS; CAUSALITY; EXPANSION; DYNAMICS; MATTER AB We propose a test of Monte Carlo Parton Cascade models based on analytic solutions of covariant kinetic theory for longitudinally boost and transverse translation invariant boundary conditions. We compute the evolution of the transverse energy per unit rapidity for typical minijet initial conditions expected in ultra-relativistic nuclear collisions, The kinetic theory solutions under these conditions test the models severely because they deviate strongly from free-streaming and also from ideal Euler and dissipative Navier-Stokes hydrodynamical approximations. We show that the newly formulated ZPC model passes this test. In addition, we show that the initial mini-jet density would need to be approximately four times higher than estimated with the HIJING generator in central Au+Au collisions at c.m. energies 200 A GeV in order that parton cascade dynamics can be approximated by Navier-Stokes hydrodynamics. Published by Elsevier Science B.V. C1 Columbia Univ, Dept Phys, New York, NY 10027 USA. Univ Washington, INT, Seattle, WA 98195 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gyulassy, M (reprint author), Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA. NR 34 TC 52 Z9 52 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 DEC 1 PY 1997 VL 626 IS 4 BP 999 EP 1018 DI 10.1016/S0375-9474(97)00604-0 PG 20 WC Physics, Nuclear SC Physics GA YM340 UT WOS:000071053800007 ER PT J AU Bhatnagar, SK AF Bhatnagar, SK TI Isotropic analog - A method for penetration dose rate analysis SO NUCLEAR TECHNOLOGY LA English DT Article AB Penetration shielding design for primary and secondary shield walls in a nuclear power plant proceeds in several iterative cycles. These cycles are needed to refine the conceptual designs for numerous, often conflicting, requirements. These requirements include the following: worker occupancy, in-service inspections, ventilation, pressure and temperature transient controls, equipment qualification, etc. Because the determination of neutron and gamma radiation levels in the containment building of a nuclear power plant requires a three-dimensional calculation, which is both very complicated and expensive, simplified but conservative procedures are needed to provide that input for various other analyses. Once an optimized design is developed, it can be confirmed by either a full three-dimensional analysis or acceptable combinations of discrete ordinates and Monte Carlo methods. The isotropic analog method and its enhancement are presented to provide such an alternative. Included are the methodology, its justification, confirmation, limitations, and suggestions for additional development. This method has already been used for the shielding design of two nuclear power plants and shown to be conservative by a factor of between 2 and 5. RP Bhatnagar, SK (reprint author), US DOE,EH-32,GERMANTOWN,MD 20874, USA. NR 15 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 DEC PY 1997 VL 120 IS 3 BP 224 EP 231 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YH461 UT WOS:A1997YH46100005 ER PT J AU Vest, MA Lewandowski, EF Pierce, RD Smith, JL AF Vest, MA Lewandowski, EF Pierce, RD Smith, JL TI Development of a bench-scale metal distillation furnace SO NUCLEAR TECHNOLOGY LA English DT Article AB Design of an inductively heated bench-scale distillation furnace (retort) capable of processing actinides is described The apparatus consists of a vacuum/inert gas bell jar a bell-jar lift a nonwater-cooled induction coil, the induction tank circuit, and a series of components designed to contain the metal melts and vapors. The apparatus is located within a nitrogen glovebox and is designed to process plutonium-containing feeds. The electrical parameters of the induction coil and tank circuit necessary for design were determined by two different methods; one is based solely on calculated impedance values, and the other used high-frequency impedance measurements on a mock-up of the induction coil/susceptor arrangement. During the design stage, the two methods of determining electrical parameters gave similar results. With the as-built system, the impedance meter did detect some efficiency loss to the metal bell jar and coil support that the calculational method did not predict. These losses were nor significant enough to cause operating problems, and thus, both methods were shown to be adequate for the intended purpose. Zinc and magnesium were distilled, and uranium was melted in a successful series of shakedown runs. RP Vest, MA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 1 Z9 1 U1 1 U2 3 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD DEC PY 1997 VL 120 IS 3 BP 232 EP 242 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YH461 UT WOS:A1997YH46100006 ER PT J AU Vest, MA Johnson, GK Pierce, RD Wesolowski, EJ AF Vest, MA Johnson, GK Pierce, RD Wesolowski, EJ TI Operation of a bench-scale metal distillation furnace SO NUCLEAR TECHNOLOGY LA English DT Article AB The operation and design of an inductively heated, bench-scale distillation furnace (retort) are described. The furnace is used as part of a pyrochemical process for the electrometallurgical treatment of spent light water reactor fuel. The focus is on the components that contain the metal melts and vapors. The forerunner of this paper focuses on the design of the induction power system. The equipment was designed to separate volatile from nonvolative metals; after separation, the nonvolatile metals are consolidated into a stillpot product. Twelve experimental runs were conducted; in seven, we used zinc as the distillate, and in five we used zinc-magnesium. In one of the runs, uranium was the stillpot product, and in two runs, copper was used as a substitute for uranium. After solving problems caused by violent evaporation, reboiling of the collected distillate, and blockage of the vapor path, we were able to evaporate the zinc and magnesium with distillate losses <6%. In some cases, the loss was as low as 0.3%. The stillpot product was successfully consolidated. Complete recovery of the stillpot product was achieved in one run. RP Vest, MA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 0 Z9 0 U1 1 U2 3 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD DEC PY 1997 VL 120 IS 3 BP 243 EP 253 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YH461 UT WOS:A1997YH46100007 ER PT J AU Funk, DJ Moore, DS AF Funk, DJ Moore, DS TI Fourier-transform spectroscopy using liquid-crystal technology SO OPTICS LETTERS LA English DT Article AB We report the use of a ferroelectric liquid-crystal (FLC) mask as an optical encoder for development of a solid-state Fourier-transform spectrometer. For this demonstration a 1 x 64 element array was striped and used as a 1 x 4 element device. The device intersected dispersed radiation and encoded each spectral component with a carrier signal by applying half-wave potential to each of the four striped (1 x 16) FLC elements, which varied the transmitted amplitude of the light from 0.03% to 28% of full scale. The light was spectrally recombined and imaged onto a photomultiplier and the resulting carriers (and their amplitudes) detected by Fourier transformation of the time-varying signal. Spectra of colored-glass filters were taken to demonstrate the possibilities of the instrument. RP Funk, DJ (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. RI Moore, David/C-8692-2013 NR 4 TC 3 Z9 3 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD DEC 1 PY 1997 VL 22 IS 23 BP 1799 EP 1801 DI 10.1364/OL.22.001799 PG 3 WC Optics SC Optics GA YJ147 UT WOS:A1997YJ14700021 PM 18188370 ER PT J AU Jellison, GE Modine, FA Boatner, LA AF Jellison, GE Modine, FA Boatner, LA TI Measurement of the optical functions of uniaxial materials by two-modulator generalized ellipsometry: rutile (TiO2) SO OPTICS LETTERS LA English DT Article ID ANISOTROPIC MEDIA AB Two-modulator generalized ellipsometry is applied to determination of the optical functions of uniaxial rutile. For a nondepolarizing sample the two-modulator generalized ellipsometer determines all the elements of the normalized Jones matrix with one measurement and thereby totally characterizes light reflecting from the sample. If a uniaxial crystal is appropriately aligned, then determining its optical functions requires only a single measurement. We have used this new instrument to obtain optical functions of rutile that are the most accurate available for optical energies above the band edge. (C) 1997 Optical Society of America. RP Jellison, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 17 TC 58 Z9 58 U1 1 U2 12 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD DEC 1 PY 1997 VL 22 IS 23 BP 1808 EP 1810 PG 3 WC Optics SC Optics GA YJ147 UT WOS:A1997YJ14700024 PM 18188373 ER PT J AU Renusch, D Grimsditch, M Koshelev, I Veal, BW Hou, PY AF Renusch, D Grimsditch, M Koshelev, I Veal, BW Hou, PY TI Strain determination in thermally-grown alumina scales using fluorescence spectroscopy SO OXIDATION OF METALS LA English DT Article DE alumina scales; stresses; strains; fluorescence; Raman spectroscopy ID TRANSIENT OXIDATION; STRESS GENERATION; OXIDE SCALES; ALLOYS; BEHAVIOR; RELIEF AB By exploiting the strain dependence of the ruby luminescence line, we have measured room-temperature residual strains in thermally-grown alumina scales, Measurements were made on two alloys Fe-5Cr-28Al and Fe-18Cr-10Al (at.%, bal. Fe), oxidized between 300-1300 degrees C. Significantly different levels of str ain buildup were observed in scales on these alloys, Results on similar alloys containing a dilute reactive element (RE) are also presented Scales formed on RE-containing alloys (Zr or Hf) could support significantly higher strains at T greater than or equal to 1000 degrees C. Strain relief associated with spallation thresholds is readily observed. In early-stage oxidation, the evolution of transition phases is monitored using Raman and fluorescence spectroscopies. The fluorescence technique also provides a sensitive probe of early-stage formation of alpha-Al2O3. It appears that, in the presence of Cr2O3 or Fe2O3, the alpha-phase of Al2O3 can form at anomalously low temperatures. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Western Michigan Univ, Kalamazoo, MI 49008 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Renusch, D (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 39 TC 40 Z9 41 U1 2 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X J9 OXID MET JI Oxid. Met. PD DEC PY 1997 VL 48 IS 5-6 BP 471 EP 495 DI 10.1007/BF02153461 PG 25 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA YT525 UT WOS:000071615800006 ER PT J AU Petri, MC Dayananda, MA AF Petri, MC Dayananda, MA TI Vacancy wind contributions to intrinsic diffusion SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID ZIRCONIUM SYSTEM AB In the absence of kinetic cross interactions between diffusing components, intrinsic diffusion can be described by a simple atomic mobility model in which intrinsic diffusion is driven solely by the chemical potential gradient of each component. For systems in which the diffusional interactions between components cannot be ignored, the interactions can be related to a vacancy wind effect whereby the net vacancy flux makes an additional contribution to the total intrinsic flux of a component. New relations are derived to describe interdiffusion fluxes in terms of atomic mobilities and a vacancy wind parameter. These relations are applied at selected composition points on the diffusion paths of gamma-phase U-Pu-Zr diffusion couples investigated at 750 degrees C. The calculated atomic mobilities and the vacancy wind parameter are employed to assess the contribution of the vacancy wind effect to the intrinsic diffusion of the individual components. The results show that the vacancy wind contribution to intrinsic diffusion can be greater than the contribution arising from chemical potential gradients. When these two contributions are in opposite directions, the net intrinsic diffusion of a component can be against its own chemical potential gradient. This paper reports, for the first time, experimental evidence for the intrinsic diffusion of U up its own chemical potential gradient. C1 PURDUE UNIV,SCH MAT ENGN,W LAFAYETTE,IN 47907. RP Petri, MC (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 6 Z9 6 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1997 VL 76 IS 6 BP 1169 EP 1185 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA YH910 UT WOS:A1997YH91000005 ER PT J AU BussmannHolder, A Bishop, AR AF BussmannHolder, A Bishop, AR TI Antiferromagnetism and superconductivity SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN; BI2SR2CACU2O8; TRANSITION; YBA2CU3O7; PHONONS AB In all copper oxide superconductors the undoped parent compounds show antiferromagnetism in the CuO2 planes. In this paper, antiferromagnetic spin fluctuations are modified through localized Jahn-Teller coupling which leads to a strong reduction in the Coulomb, repulsion and induces superconductivity with increased doping. An isotope experiment on the Neel temperature is proposed, which could eventually uniquely substantiate the proposed model. C1 LOS ALAMOS NATL LAB,DIV THEORET,MS B262,LOS ALAMOS,NM 87545. RP BussmannHolder, A (reprint author), MAX PLANCK INST FESTKORPERFORSCH,HEISENBERGSTR 1,D-70569 STUTTGART,GERMANY. NR 34 TC 8 Z9 8 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER 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 DEC PY 1997 VL 76 IS 6 BP 887 EP 894 DI 10.1080/01418639708243136 PG 8 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA YH909 UT WOS:A1997YH90900004 ER PT J AU Stevens, FJ Li, AD Lateef, SS Anderson, LE AF Stevens, FJ Li, AD Lateef, SS Anderson, LE TI Identification of potential inter-domain disulfides in three higher plant mitochondrial citrate synthases: Paradoxical differences in redox-sensitivity as compared with the animal enzyme SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE redox-sensitive cysteines; redox-regulation; reductive activation; regulatory disulfides ID MOLECULAR CHARACTERIZATION; CHLOROPLAST ENZYMES; PROTEIN; MODULATION; DEHYDROGENASE; EXPRESSION; CYSTEINES; PRINCIPLE; BINDING; FORMS AB The mitochondrial citrate synthases (EC 4.1.3.7) of pummelo, potato and Arabidopsis are activated in crude extracts by dithiothreitol treatment and/or inactivated by the strong oxidizing agent diamide. Surprisingly, homology modeling reveals a potential disulfide involving two cysteine residues which are also present in the redox-insensitive model enzyme, pig heart citrate synthase. Energy minimization calculations suggest that differences in the charge distribution enhance disulfide bond formation in the plant mitochondrial citrate synthase and inhibit disulfide bond formation in the mammalian enzyme. C1 Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA. Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, Argonne, IL 60439 USA. RP Anderson, LE (reprint author), Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA. NR 30 TC 16 Z9 17 U1 1 U2 3 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 DEC PY 1997 VL 54 IS 3 BP 185 EP 197 DI 10.1023/A:1005991423503 PG 13 WC Plant Sciences SC Plant Sciences GA YV067 UT WOS:000071786300003 ER PT J AU Keller, SE Heuser, BJ Carpenter, JM AF Keller, SE Heuser, BJ Carpenter, JM TI MCNP simulations of neutron moderation in the IPNS C moderator SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA AB We have used the MCNP code to simulate neutron moderation in the IPNS target/moderator assembly. The goal of this study was to investigate the effect of groove configuration on neutron leakage from the C moderator. This moderator supplies low energy neutrons to four low-Q elastic scattering instruments; two reflectometers and two SANS instruments. The current horizontally grooved configuration is not optimized for the two vertical-slit-geometry reflectometers. This study resulted in a more optimized groove configuration. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Univ Illinois, Dept Nucl Engn, Urbana, IL 61801 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Heuser, BJ (reprint author), Univ Illinois, Dept Nucl Engn, Urbana, IL 61801 USA. NR 0 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 30 EP 32 DI 10.1016/S0921-4526(97)00504-8 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600007 ER PT J AU Iverson, EB Carpenter, JM Hill, EJ AF Iverson, EB Carpenter, JM Hill, EJ TI Cold neutron beams at the Intense Pulsed Neutron Source SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE neutron spectra; cold neutrons; neutron source modeling AB The three moderators at the Intense Pulsed Neutron Source (IPNS) are of cryogenic methane (CH4); one of liquid methane at 100 K, and two of solid methane at 30 K. These moderators produce intense beams of both cold and thermal neutrons. The moderators are each of a different physical configuration in order to tailor their performance for the 14 instruments and test facilities that operate on the 12 neutron beams. IPNS has started a program to enhance the effectiveness of its target/moderator/reflector system. This program involves both Monte Carlo computer modeling of the system and measuring the intensity distributions of the neutron beams. This paper reports the first phases of this project - calculations and measurements of the existing system - which will serve as points of reference for gauging the effectiveness of the proposed improvements. The measurements provide absolute spectra using foil activation techniques joined with time-of-flight measurements performed with thin beam monitor detectors installed at the neutron-scattering instruments. The comparison of the experimental and computational results provides verification for the physical model of the system and the cross-section data used in the calculations. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Intense Pulsed Neutron Source 360, Argonne, IL 60439 USA. RP Iverson, EB (reprint author), Argonne Natl Lab, Intense Pulsed Neutron Source 360, 9700 S Cass Ave, Argonne, IL 60439 USA. OI Iverson, Erik /0000-0002-7920-705X NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 33 EP 35 DI 10.1016/S0921-4526(97)00505-X PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600008 ER PT J AU West, CD Farrar, MB AF West, CD Farrar, MB TI Upgrading scientific capabilities at the high-flux isotope reactor SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE cold source; thermal neutrons; HFIR AB Following the termination of the Advanced Neutron Source (ANS) Project, an upgrading program for the Department of Energy's High Flux Isotope Reactor (HFIR) was devised by a team of researchers and reactor operators, which has been proposed to the department. HFIR is a multipurpose research reactor, commissioned in 1965, with missions in four nationally important areas: isotope production, especially transuranic isotopes; neutron scattering; neutron activation analysis; and irradiation testing of materials. For neutron scattering, there are two major enhancements and several smaller ones. The first is the installation of a small, hydrogen cold neutron source in one of the four existing beam tubes: because of the high reactor power, and the use of new design concepts developed for ANS, the cold source will be as bright as, or brighter than, the Institut Laue-Langevin liquid deuterium vertical cold source, although space limitations mean that there will be far fewer cold beams and instruments at HFIR. This project is underway, and the cold source is expected to come on line following an extended shutdown in 1999 to replace the reactor's beryllium reflector. The second major change proposed would put five thermal neutron guides at an existing beam port and construct a new guide hall to accommodate instruments on these very intense beams. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, FEDC, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, HFIR, Oak Ridge, TN 37831 USA. RP West, CD (reprint author), Oak Ridge Natl Lab, FEDC, POB 2009, Oak Ridge, TN 37831 USA. NR 0 TC 1 Z9 2 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 46 EP 47 DI 10.1016/S0921-4526(97)00870-3 PG 2 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600012 ER PT J AU Crawford, RK AF Crawford, RK CA NSNS Collaboration Team TI Neutron-scattering instrumentation for the National Spallation Neutron Source SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE pulsed; spallation; source; instruments AB The National Spallation Neutron Source (NSNS) is a 1 MW pulsed spallation neutron source proposed for construction at Oak Ridge National Laboratory. This facility is being designed as a five-laboratory collaboration project. This Foster addresses the proposed facility layout, the process for selection and construction of neutron-scattering instruments at the NSNS, and the initial planning done on the basis of a reference set of 10 instruments. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, NSNS, Oak Ridge, TN 37831 USA. RP Crawford, RK (reprint author), Argonne Natl Lab, IPNS, 9700 S Cass Ave,Bldg 360, Argonne, IL 60439 USA. NR 1 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 107 EP 109 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600029 ER PT J AU Fitzsimmons, MR Lutt, M Pynn, R Kinder, H Prusseit, W AF Fitzsimmons, MR Lutt, M Pynn, R Kinder, H Prusseit, W TI Use of YBCO films for applications with polarized neutrons SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE instrumentation; polarized neutrons; YBCO AB The use of a superconducting thin YBCO film as a Meissner screen in a cryoflipper is demonstrated. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. TU Munchen, Dept Phys, D-85747 Garching, Germany. RP Fitzsimmons, MR (reprint author), Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, POB 1663, Los Alamos, NM 87545 USA. RI Lujan Center, LANL/G-4896-2012 NR 5 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 121 EP 123 DI 10.1016/S0921-4526(97)00527-9 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600033 ER PT J AU Ioffe, A Jacobson, D Arif, M Vrana, M Werner, SA Fischer, P Greene, G Mezei, F AF Ioffe, A Jacobson, D Arif, M Vrana, M Werner, SA Fischer, P Greene, G Mezei, F TI A new neutron interferometric method used to measure the scattering length of silicon SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE neutron interferometry; coherent scattering length; silicon AB The neutron interferometry technique provides a precise and direct way to measure the coherent scattering lengths b of low-energy neutrons, but its potential accuracy has not been fully realized in past experiments due to systematic sources of error. We have used a new method, which eliminates two of the main sources of error, to measure the scattering length of silicon to an accuracy of 0.005%. The resulting value b = 4.1507(2) fm is in agreement with the current accepted value, but has an error limit five times lower. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Hahn Meitner Inst, Berlin Neutron Scattering Ctr, D-14109 Berlin, Germany. St Petersburg Nucl Phys Inst, Gatchina 188350, Russia. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. CAS, Inst Phys Nucl, Rez 20568, Czech Republic. Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. RP Ioffe, A (reprint author), Hahn Meitner Inst, Berlin Neutron Scattering Ctr, Glienicker Str 100, D-14109 Berlin, Germany. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 130 EP 132 DI 10.1016/S0921-4526(97)00866-1 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600036 ER PT J AU Mikkelson, D Worlton, T AF Mikkelson, D Worlton, T TI TOF-VIS, software for interactive exploration of time-of-flight data SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE data visualization; instrumentation; neutron scattering AB TOF-VIS is a fast, highly interactive program for examining time-of-flight neutron-scattering data. All spectra from an experiment are displayed simultaneously as an image. The data can be displayed in terms of time-of-flight, energy, wave vector, or lattice spacing. TOF-VIS has been used for examining data from IPNS and ISIS, and has been useful for diagnosing problems with instruments and detectors as well as for making a quick evaluation of the quality of the data. Hard copy output to a variety of devices using routines built on PGPLOT is now available. TOF-VIS is portable to VMS and UNIX, and is currently implemented primarily using object-based methods in C, MOTIF and X-Windows. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Wisconsin, Dept Math Stat & Comp Sci, Menomonie, WI 54751 USA. Argonne Natl Lab, IPNS, Argonne, IL 60439 USA. RP Mikkelson, D (reprint author), Univ Wisconsin, Dept Math Stat & Comp Sci, Menomonie, WI 54751 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 142 EP 144 DI 10.1016/S0921-4526(97)00533-4 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600040 ER PT J AU Klosowski, P Koennecke, M Tischler, JZ Osborn, R AF Klosowski, P Koennecke, M Tischler, JZ Osborn, R TI NeXus: A common format for the exchange of neutron and synchrotron data SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE data format; data analysis; data visualization; computing AB NeXus is a data format for the exchange of neutron and synchrotron scattering data between facilities and user institutions. It has been developed by an international team of scientists and computer programmers from neutron and X-ray facilities around the world. The NeXus format uses the hierarchical data format (HDF) which is portable, binary, extensible and self-describing. The NeXus format defines the structure and contents of these HDF tiles in order to facilitate the visualization and analysis of neutron and X-ray data. In addition? an application program interface (API) is being produced in order to simplify the reading and writing of NeXus files. The details of the format are available at [http://www.neutron.anl.gov/NeXus/]. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Natl Inst Stand & Technol, Reactor Res Div, Gaithersburg, MD 20899 USA. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Argonne Natl Lab, Argonne, IL 60439 USA. RP Klosowski, P (reprint author), Natl Inst Stand & Technol, Reactor Res Div, Gaithersburg, MD 20899 USA. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 2 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 151 EP 153 DI 10.1016/S0921-4526(97)00865-X PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600043 ER PT J AU Robinson, RA McQueeney, RJ Kelley, TM AF Robinson, RA McQueeney, RJ Kelley, TM TI Observation of transverse phonon modes in the first Brillouin zone in aluminum SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE aluminum phonons; multiple scattering; time-of-flight spectroscopy AB We describe phonon dispersion measurements on a single crystal of aluminum, using the 1280-pixel low-angle detector on PHAROS at Los Alamos. "Forbidden" transverse phonons are observed in the first Brillouin zone: these are due to multiple scattering that preserves the e-dependence of the dispersion surface. We discuss the use of large-area detectors for imaging dispersion surfaces. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, LANSCE 12, Los Alamos, NM 87545 USA. RP Robinson, RA (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE 12, Mail Stop H805, Los Alamos, NM 87545 USA. OI McQueeney, Robert/0000-0003-0718-5602 NR 6 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 161 EP 163 DI 10.1016/S0921-4526(97)00538-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600046 ER PT J AU Drews, AR Barker, JG Glinka, CJ Agamalian, M AF Drews, AR Barker, JG Glinka, CJ Agamalian, M TI Development of a thermal-neutron double-crystal diffractometer for USANS at NIST SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE small-angle scattering; neutron instrumentation; perfect crystal diffraction; microstructure characterization AB The design and projected performance of a Bonse-Hart, ultra-high-resolution, small-angle neutron-scattering (USANS) diffractometer of the type that is being developed at the NIST Center for Neutron Research (NCNR) is described. The instrument is projected to have a minimum Q-value of less than or equal to 0.001 nm(-1) with a beam current at the sample in excess of 10(5) n/s. (C) 1998 Elsevier Science B.V. All rights reserved. C1 NIST, Gaithersburg, MD 20899 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Glinka, CJ (reprint author), NIST, E 151,Bldg 235, Gaithersburg, MD 20899 USA. OI Agamalian, Michael/0000-0002-9112-2534 NR 2 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 189 EP 191 DI 10.1016/S0921-4526(97)00547-4 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600056 ER PT J AU Katano, S Ishii, Y Morii, Y Child, HR Fernandez-Baca, JA AF Katano, S Ishii, Y Morii, Y Child, HR Fernandez-Baca, JA TI Upgrade of the wide-angle neutron diffractometer at the high-flux isotope reactor SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE diffractometer; WAND; HFIR; flat-cone geometry; curved one-dimensional position sensitive detector AB The wide-angle neutron diffractometer (WAND) is an instrument that can be used either as a hat-cone geometry diffractometer or as a fast powder diffractometer. This instrument is located at the high-flux isotope reactor (HFIR), and is currently being upgraded. The central part of this upgrade is the development of a new curved one-dimensional position sensitive detector which covers a 125 degrees angular range with an effective radius of 71 cm. This detector will be a multi-anode (624 anodes on a 0.2 degrees pitch) He-3 gas-filled proportional counter. This totally new system will give high resolution, good uniformity and high counting rate -a maximum capability of 10(5) cps/pixel and a 10(7) cps overall. A prototype of this detector has shown that these design targets can be met. The new WAND will greatly broaden the capabilities for single-crystal diffraction experiments and for time-resolved measurements. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Japan Atom Energy Res Inst, Adv Sci Res Ctr, Neutron Scattering Grp, Oarai, Ibaraki 31911, Japan. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Katano, S (reprint author), Japan Atom Energy Res Inst, Adv Sci Res Ctr, Neutron Scattering Grp, Oarai, Ibaraki 31911, Japan. RI Fernandez-Baca, Jaime/C-3984-2014 OI Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 1 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 198 EP 200 DI 10.1016/S0921-4526(97)00550-4 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600059 ER PT J AU Ozawa, M Loong, CK AF Ozawa, M Loong, CK TI Neutron studies of nanostructured CuO-Al2O3 NOx removal catalysts SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE alumina catalyst; copper-modified alumina; nitrogen oxides; automotive exhaust ID SCATTERING; ALUMINA AB Nanostructured powders of automotive catalytic system CuO-Al2O3, targeted for nitrogen oxides (NOx) removal under lean-burn engine conditions, were investigated using neutron diffraction and small-angle neutron scattering. The crystal phases, structural transformations and microstructure of 10 mol% Cu-Al2O3 powders are characterized according to the heat-treatment conditions. These properties are correlated with the pore structure and NO, removal efficiency determined by nitrogen adsorption isotherm, electron spin resonance, and temperature-programmed reaction measurements. The gamma-(Cu, Al)(2)O-3 phase and the mass-fractal-like aggregate of particles (size approximate to 26 nm) at annealing temperatures below 900 degrees C were found to he crucial to the high NOx removal performance. The transformation to bulk crystalline phases of alpha-Al2O3 + CuAl2O4 spinel above similar to 1050 degrees C corresponds to a drastic drop of NOx removal efficiency. The usefulness of neutron-scattering techniques as well as their complementarity with other traditional methods of catalytic research are discussed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Nagoya Inst Technol, CRL, Gifu 507, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. RP Ozawa, M (reprint author), Nagoya Inst Technol, CRL, Gifu 507, Japan. EM ozawa@crl.nitech.ac.jp NR 15 TC 0 Z9 0 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 269 EP 275 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600077 ER PT J AU Radaelli, PG Iannone, G Cox, DE Marezio, M Hwang, HY Cheong, SW AF Radaelli, PG Iannone, G Cox, DE Marezio, M Hwang, HY Cheong, SW TI Competition between charge ordering and ferromagnetism in manganese perovskites SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE manganese perovskites; colossal magnetoresistance; neutron powder diffraction; magnetic diffuse scattering ID NEUTRON-DIFFRACTION; COLOSSAL-MAGNETORESISTANCE; LA1-XCAXMNO3; TRANSITION; MANGANITES; LA1-XSRXMNO3; TEMPERATURE AB Manganese perovskites have recently been the subject of renewed attention, due to the "colossal" magnetoresistance (CMR) and the coupled metal-insulator and magnetic transitions displayed at the spin-ordering temperature T-C by some of these compounds. The charge localization mechanism above T,appears at present to be the single most important issue in manganite research. Neutron and synchrotron X-ray diffraction studies have revealed, for appropriate doping ranges, a strong competition between the metallic state, which is ferromagnetic and shows small lattice distortions, and a charge-localized/ordered state that becomes antiferromagnetic at low temperatures and shows large lattice distortions of the Jahn-Teller type. In the case of La0.5Ca0.5MnO3 and Pr0.7Ca0.3MnO3, these two states can coexist giving rise to transient inhomogeneities. The possibility that a similar situation may be reproduced in the paramagnetic phase will be discussed, in the light of recent neutron-diffuse-scattering data suggestive of extended ferromagnetic fluctuations aboveT(C). (C) 1998 Elsevier Science B.V. All rights reserved. C1 ILL, F-38042 Grenoble, France. Brookhaven Natl Lab, Upton, NY 11973 USA. CNR, MASPEC, I-42100 Parma, Italy. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08855 USA. RP Radaelli, PG (reprint author), ILL, F-38042 Grenoble, France. RI Radaelli, Paolo/C-2952-2011; Hwang, Harold/I-6943-2012 OI Radaelli, Paolo/0000-0002-6717-035X; NR 30 TC 5 Z9 5 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 295 EP 302 DI 10.1016/S0921-4526(97)00862-4 PG 8 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600081 ER PT J AU Wakabayashi, N Nicklow, RM Katano, S Ishii, Y Child, HR Smith, HG Fernandez-Baca, JA AF Wakabayashi, N Nicklow, RM Katano, S Ishii, Y Child, HR Smith, HG Fernandez-Baca, JA TI Calculation of thermal diffuse scattering SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE thermal diffuse scattering; single-crystal diffraction; neutron instrumentation AB We have developed a computer program to calculate the thermal diffuse scattering (TDS) intensity distribution for single-crystal specimens in a diffractometer with no energy analysis. We assumed that the phonon frequencies are approximated by those of elastic waves and that the elastic constants, density and lattice parameters of the system under study are known. The results of the calculations were compared to experimental data obtained for single crystals of Si, diamond and NiAl at the wide-angle neutron diffractometer (WAND) at the HFIR at Oak Ridge National Laboratory. Excellent agreement was found between the calculations and the experimental observations. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Keio Univ, Dept Phys, Yokohama, Kanagawa 223, Japan. Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 31911, Japan. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Fernandez-Baca, JA (reprint author), Keio Univ, Dept Phys, Yokohama, Kanagawa 223, Japan. RI Fernandez-Baca, Jaime/C-3984-2014 OI Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 0 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 320 EP 322 DI 10.1016/S0921-4526(97)00573-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600085 ER PT J AU Urban, V Chiarizia, R Herlinger, AW Ku, CY Thiyagarajan, P AF Urban, V Chiarizia, R Herlinger, AW Ku, CY Thiyagarajan, P TI SANS study of dialkylsubstituted diphosphonic acids and their complexes with Ca, Fe, La, Th and U in toluene SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE SANS; metal chelates; aggregation; diphosphonic acids AB The aggregation of di(2ethylhexyl) methane-, ethane- and butanediphosphonic acids and their complexes with various metal cations at different concentrations in toluene have been studied in detail using small angle neutron scattering. The diphosphonic acids are being employed as novel solvent extraction reagents in the Chemistry Division of ANL. These compounds exhibit extraordinarily strong affinity for actinide ions and for Fe(III). The growth of large metal-diphosphonate aggregates depends on the metal species, metal to extractant ratio, and the length of the carbon bridge between the two acid groups. Fe(III) complexes with the methane and butane (but not the ethane) bridged diphosphonic acid aggregate to form large polymeric rods at high metal to extractant ratios. Actinide ions likewise give large aggregates with di(2ethylhexyl) methanediphosphonic acid. Ca2+ and La3+ show only the usual formation of small 'monomeric' chelates. Published by Elsevier Science B.V. C1 Argonne Natl Lab, IPNS Div, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Loyola Univ, Dept Chem, Chicago, IL 60626 USA. RP Thiyagarajan, P (reprint author), Argonne Natl Lab, IPNS Div, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Urban, Volker/N-5361-2015 OI Urban, Volker/0000-0002-7962-3408 NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 355 EP 357 DI 10.1016/S0921-4526(97)00586-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600097 ER PT J AU Chakoumakos, BC Nagler, SE Misture, ST Christen, HM AF Chakoumakos, BC Nagler, SE Misture, ST Christen, HM TI High-temperature structural behavior of SrRuO3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE strontium ruthenate; ferromagnet; perovskite; structural phase transition ID NEUTRON POWDER DIFFRACTION; CARUO3; CERAMICS AB The unusual metal SrRuO3 is perhaps the only known 4d transition-metal-based ferromagnet (T-c = 162 K) with a sizable moment. To complement low-T polarized neutron diffraction measurements of the magnetization density, high-cr neutron diffraction measurements are reported here. Two structural phase transitions are observed. Between 10 and 800 K, SrRuO3 is orthorhombic and at 800 K it appears to be tetragonal until 975 K, where it becomes cubic. The temperature variation of the lattice parameters is reported along with a structural description of the tetragonal phase. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Alfred Univ, New York State Coll Ceram, Alfred, NY 14802 USA. Neocera Inc, Beltsville, MD 20705 USA. RP Chakoumakos, BC (reprint author), Oak Ridge Natl Lab, Div Solid State, POB 2008,Bldg 7962, Oak Ridge, TN 37831 USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Christen, Hans/H-6551-2013; Chakoumakos, Bryan/A-5601-2016 OI Nagler, Stephen/0000-0002-7234-2339; Christen, Hans/0000-0001-8187-7469; Chakoumakos, Bryan/0000-0002-7870-6543 NR 14 TC 41 Z9 41 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 358 EP 360 DI 10.1016/S0921-4526(97)00587-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600098 ER PT J AU Chakoumakos, BC AF Chakoumakos, BC TI Systematics of atomic displacement parameters in perovskite oxides SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE atomic displacement parameter; Debye-Waller factor; oxide perovskite ID UNION-OF-CRYSTALLOGRAPHY; REFINEMENT ROUND-ROBIN; RIETVELD REFINEMENT; POWDER-DIFFRACTION; X-RAY; COMMISSION AB Atomic displacement parameters (ADPs) determined from crystal structure refinement principally embody atomic thermal vibration, but they can also include the effects of disorder, partial site occupancy, electronic interactions, and other factors. A growing number of consistently determined studies are becoming available from high T neutron powder diffraction instrumentation, making it possible in the near future to explore the systematic behavior of ADPs for chemically diverse and important classes of oxides such as the perovskites. Factors such as coordination number, formal valence, site symmetry, polyhedral volume, bond valence sum, electronegativity, temperature, atomic number, Debye temperature, phonon density of stares and atomic size can be tested for significance. Ultimately, empirical rules and parameters to account for the systematic behavior can be developed, and then used as tools for studying new materials and identifying anomalous behavior. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Chakoumakos, BC (reprint author), Oak Ridge Natl Lab, Div Solid State, POB 2008, Oak Ridge, TN 37831 USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 8 TC 8 Z9 8 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 361 EP 363 DI 10.1016/S0921-4526(97)00588-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600099 ER PT J AU Hu, Z Jorgensen, JD Teslic, S Short, S Argyriou, DN Evans, JSO Sleight, AW AF Hu, Z Jorgensen, JD Teslic, S Short, S Argyriou, DN Evans, JSO Sleight, AW TI Pressure-induced phase transformation in ZrW2O8 - Compressibility and thermal expansion of the orthorhombic phase SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE in situ neutron diffraction; negative thermal expansion; compressibility; ZrW2O8; pressure AB In situ neutron powder diffraction has been used to show that the application of hydrostatic pressure at room temperature produces a transformation of ZrW2O8 from the cubic to an orthorhombic phase beginning at 2.1 kbar and completed by 3.1 kbar, with a 5% reduction in volume. After release of pressure, the orthorhombic phase is retained at room temperature. Its thermal expansion is negative below room temperature, but is positive above room temperature with a transformation back to the cubic phase at about 390 K. The WO4 groups are found to play the dominant role in both phase transformations. The volume compressibilities of the cubic and orthorhombic phases are 1.38 x 10(-3) and 1.53 x 10(-3) kbar(-1). respectively. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA. RP Hu, Z (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM zhu@anl.gov RI Evans, John/E-6345-2012 OI Evans, John/0000-0001-6305-6341 NR 7 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 370 EP 372 DI 10.1016/S0921-4526(97)00591-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600102 ER PT J AU Luo, H Chen, M Yelon, WB Hu, Z Chang, WC Lu, SL AF Luo, H Chen, M Yelon, WB Hu, Z Chang, WC Lu, SL TI Structural analysis of R2Fe17-(x)Al(x)C1 (R = Y, Pr, Tb, Ho, Er; x = 2,4) alloys by neutron diffraction SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE neutron diffraction; hard magnetic materials; carbide; site occupancy AB The structures of R2Fe17-xAlxC1 (R = Y, Pr, Tb, Ho, Er; x = 2, 4) have been studied with neutron diffraction. All of the compounds have the rhombohedral Th2Zn17 structure (space group R-3m) except for the Er series which has the disordered hexagonal Th2Ni17 structure (space: group P 6(3)/mmc). Both substitution of Fe and interstitial C can trigger the structure change from hexagonal to rhombohedral in the heavy rare-earth 2: 17 compounds. In the rhombohedral compounds, Al is found to prefer the 18h site and fills up the 6c site more rapidly at higher Al concentration. No Al is found at the 9d site. C is mainly found at the 9e site. In the Pr compounds, a small amount of C is also found at the 18g site. In the Er samples, Al is found at the Fe 6g site which is the equivalent of the 9d site in the rhombohedral structure. (C) 1995 Elsevier Science B.V. All rights reserved. C1 Univ Missouri, Res Reactor, Columbia, MO 65211 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Natl Chung Cheng Univ, Dept Phys, Chiayi, Taiwan. RP Luo, H (reprint author), Univ Missouri, Res Reactor, Columbia, MO 65211 USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 379 EP 381 DI 10.1016/S0921-4526(97)00594-2 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600105 ER PT J AU Li, X Lager, GA Loong, CK Richardson, JW Miranda, R AF Li, X Lager, GA Loong, CK Richardson, JW Miranda, R TI Neutron powder diffraction study of sulfated zirconia catalysts SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE sulfated zirconia; metastable zirconia; catalysts; phase transformation AB In situ neutron powder diffraction method was used to investigate the crystal structures, phase abundance and thermal stability of sulfated zirconia catalysts prepared by impregnation of hydrous zirconium oxide gels with 0.5 M H2SO4 solutions. The sample studied was precipated at pH = 10 and dried for 5 h at 493 K, and then calcined at 853 K for 3 h. Diffraction data were collected in the temperature range 295-1273 K in an Ar atmosphere and analyzed using the Rietveld method. Only the metastable tetragonal phase was observed below 673 K. Above this temperature, the sample consisted of a mixture of tetragonal (T) and monoclinic (M) phases in the proportions (T : M wt%) 85 : 15 (1073 K) and 61:39 (1273 K). Surface modification by sulfation was found to retard the onset of the tetragonal-to-monoclinic transformation relative to pure zirconia. The decrease in peak-broadening at the higher temperatures reflects both an increase in crystallite size and a decrease in microstrain. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Louisville, Dept Chem Engn, Louisville, KY 40292 USA. Univ Louisville, Dept Geog & Geosci, Louisville, KY 40292 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA. Natl Sci Fdn, Chem & Transport Syst Div, Arlington, VA 22230 USA. RP Li, X (reprint author), Univ Louisville, Dept Chem Engn, Louisville, KY 40292 USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 382 EP 384 DI 10.1016/S0921-4526(97)00595-4 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600106 ER PT J AU Richardson, JW Birtcher, RC Chan, SK AF Richardson, JW Birtcher, RC Chan, SK TI Neutron irradiation induced amorphization of uranium silicides SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE neutron irradiation; amorphization; powder diffraction AB Time-of-flight neutron powder diffraction studies of incrementally neutron-irradiated U3Si and U3Si2 have revealed details of progressive amorphization of bulk materials, crystalline transformation prior to amorphization, elastic strain and diffuse scattering resulting from scattering interference between crystalline and amorphous fractions. Density differences between amorphous and crystallie fractions give rise, respectively, to tensile and compressive strain in U3Si and U3Si2. Diffuse scattering associated with each Bragg peak shows crystallographic direction-dependent variation both in magnitude and displacement (relative to the Bragg position). A theoretical model describing this behavior relates the size of the amorphous zones, and the magnitude and displacement of the diffuse scattering contribution. After complete amorphization of U3Si and U3Si2, anneals to progressively higher temperatures generate gradual evolution of the short-to intermediate-range amorphous structures prior to re-crystallization. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, IPNS, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Richardson, JW (reprint author), Argonne Natl Lab, IPNS, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jwrichardson@anl.gov NR 12 TC 2 Z9 2 U1 1 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 390 EP 392 DI 10.1016/S0921-4526(97)00598-X PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600109 ER PT J AU Lager, GA Nipko, JC Loong, CK AF Lager, GA Nipko, JC Loong, CK TI Inelastic neutron scattering study of the (O4H4) substitution in garnet SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE hydrogarnet; vibrational spectroscopy; hydrogen bond ID SPECTROSCOPY AB Inelastic scattering data have been collected at incident neutron energies of 50, 150, 300 and 600 meV for hydrogarnet [Sr3Al2(O4H4)(3)], a model compound for silicate hydrogarnets found in the Earth's crust and mantle. The vibrational spectrum is characterized by a relatively sharp O-H stretch at similar to 460 meV, which is consistent with the weak O...H bond( similar to 2.65 Angstrom) and other complex features in the 20-100 meV region. The mode assignments for isostructural grossular and the infrared spectra for hydrogarnet were used as a basis for the interpretation of many of the neutron spectral features. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Louisville, Dept Geog & Geosci, Louisville, KY 40292 USA. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Lager, GA (reprint author), Univ Louisville, Dept Geog & Geosci, Louisville, KY 40292 USA. NR 4 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 406 EP 408 DI 10.1016/S0921-4526(97)00603-0 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600114 ER PT J AU Bao, W Axe, JD Chen, CH Cheong, SW Schiffer, P Roy, M AF Bao, W Axe, JD Chen, CH Cheong, SW Schiffer, P Roy, M TI From double exchange to superexchange in charge-ordering perovskite manganites SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE double exchange; colossal magnetoresistance; charge ordering; paramagnetic fluctuations ID CA-MN-O; MAGNETORESISTANCE; LA1-XCAXMNO3 AB We found dynamic ferromagnetic correlations at the room temperature in perovskite manganites which have an antiferromagnetic insulating ground state. They are replaced by antiferromagnetic correlations when the electrons order. Our results indicate that the double-exchange mechanism is turned off by electron localization at low temperatures. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. AT&T Bell Labs, Murray Hill, NJ 07974 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. RP Bao, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Schiffer, Peter/F-3227-2011; Bao, Wei/E-9988-2011; Chen, Cheng-Hsuan/F-7933-2012; OI Bao, Wei/0000-0002-2105-461X; Schiffer, Peter/0000-0002-6430-6549 NR 16 TC 1 Z9 1 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 418 EP 420 DI 10.1016/S0921-4526(97)00607-8 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600118 ER PT J AU DiFrancesco, RG Billinge, SJL Kwei, GH Neumeier, JJ Thompson, JD AF DiFrancesco, RG Billinge, SJL Kwei, GH Neumeier, JJ Thompson, JD TI Local structure and polaron formation in La1-xCaxMnO3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE colossal magnetoresistance; manganite; pair-distribution function ID MAGNETORESISTANCE AB The local structure of La1-xCaxMnO3 is determined from pair-distribution function (PDF) analysis of pulsed neutron diffraction. We have compared the effect on the local structure of crossing the metal-insulator transition as a function of temperature and composition. Crossing the metal-insulator boundary at low temperature by varying the composition yields similar distortions to those seen in the temperature dependence indicating the presence of polarons in the insulating phase which disappear in the metallic phase. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP DiFrancesco, RG (reprint author), Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. EM difrance@pa.msu.edu NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 421 EP 423 DI 10.1016/S0921-4526(97)00608-X PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600119 ER PT J AU Kelley, TM Argyriou, DN Robinson, RA Nakotte, H Mitchell, JF Osborn, R Jorgensen, JD AF Kelley, TM Argyriou, DN Robinson, RA Nakotte, H Mitchell, JF Osborn, R Jorgensen, JD TI Short-range spin correlations in the CMR material La1.4Sr1.6Mn2O7 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE colossal magneto-resistance; (La1-xSrx)(3)Mn2O7; magnetic polarons ID TRANSITION AB The (La1-xSrx)(2)Mn3O7 compounds are layered materials that exhibit higher magneto-resistance than the corresponding 3D manganite perovskites. Quasi-elastic neutron scattering on a polycrystalline sample of La1.4Sr1.6Mn2O7 shows that the spin-fluctuation spectrum of these layered CMR materials is qualitatively similar to those found in the perovskite manganites (La, Ca)MnO3; their concentration, lifetime, and coherence length increase as T decreases to T-c. Unlike the perovskites, we find a lower spin-diffusion constant above T-c of similar to 5 meV Angstrom(2). (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Kelley, TM (reprint author), Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, MS H805, Los Alamos, NM 87545 USA. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 4 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 439 EP 441 DI 10.1016/S0921-4526(97)00613-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600125 ER PT J AU Rosenkranz, S Osborn, R Mitchell, JF Geiser, U Ku, J Schultz, AJ Young, DM AF Rosenkranz, S Osborn, R Mitchell, JF Geiser, U Ku, J Schultz, AJ Young, DM TI Spin fluctuations at magnetic phase transitions in CMR manganites SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE manganese oxides; magnetoresistance; magnetic ordering ID FIELD AB We present the results of an investigation into the nature of magnetic phase transitions in CMR manganites, using small-angle neutron scattering and single-crystal neutron and X-ray diffraction. In the perovskite compound, Nd0.5Sr0.5MnO3, we observe a second-order phase transition at 250 K to a ferromagnetic phase characterized by a divergent correlation length and conventional critical exponents. At 155 K, a first-order phase transition to an antiferromagnetic phase is observed with evidence for both magnetic and orbital ordering. In the layered manganite, La1.2Sr1.8Mn2O7, the measured correlation length is only weakly temperature dependent above T-c, but may result from nuclear rather than magnetic correlations. Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Rosenkranz, S (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM srosenkranz@anl.gov RI Osborn, Raymond/E-8676-2011; Rosenkranz, Stephan/E-4672-2011 OI Osborn, Raymond/0000-0001-9565-3140; Rosenkranz, Stephan/0000-0002-5659-0383 NR 14 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 448 EP 450 DI 10.1016/S0921-4526(97)00616-9 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600128 ER PT J AU Tennant, DA Nagler, SE Barnes, T Garrett, AW Riera, J Sales, BC AF Tennant, DA Nagler, SE Barnes, T Garrett, AW Riera, J Sales, BC TI Excitations and possible bound states in the S=1/2 alternating chain compound (VO)(2)P2O7 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE bound magnons; alternating Heisenberg chain ID LADDER; SUSCEPTIBILITY; (VO)2P2O7; SPECTRUM AB Magnetic excitations in an array of (VO)(2)P2O7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)(2)P2O7 has been thought of as a two-leg antiferromagnetic Heisenberg spin ladder with chains running in the a-direction. The present results show unequivocally that (VO)(2)P2O7 is best described as an alternating spin-chain directed along the crystallographic b-direction. In addition to the expected magnon with magnetic zone-center energy gap Delta = 3.1 meV, a second elicitation is observed at an energy just below 2 Delta. The higher mode may be a triplet two-magnon bound state. Numerical results in support of bound modes are presented. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Florida, Gainesville, FL 32611 USA. Inst Fis Rosario, RA-2000 Rosario, Argentina. RP Tennant, DA (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM alan@phonon.ssd.ornl.gov RI Riera, Jose/A-1234-2008; Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Tennant, David/Q-2497-2015 OI Riera, Jose/0000-0003-4546-1137; Nagler, Stephen/0000-0002-7234-2339; Tennant, David/0000-0002-9575-3368 NR 14 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 501 EP 505 DI 10.1016/S0921-4526(97)00629-7 PG 5 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600144 ER PT J AU Wakabayashi, N Cable, JW Robertson, JL AF Wakabayashi, N Cable, JW Robertson, JL TI Magnetic structures of Dy in applied fields SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE dysprosium; magnetic structure; mean-field calculation AB The magnetic phase diagram of Dy (T-N = 179 K) shows the presence of two phases at elevated fields and temperatures, and these are presumed to be fan structures. Neutron scattering experiments were performed to determine the magnetic structures of these phases at 141, 149 and 172 K with magnetic fields between 0 and 1.8 T. It was found that the structures were characterized by two modulation wave vectors at 141 and 149 K and by only one modulation wave vector at 172 K, As the helical-fan-ferro structural changes occur, the satellite peak intensity shifts to the fundamental peaks. However, the sum of the peak intensities is not conserved because some of this intensity goes into a diffuse component covering a large range of wave vectors. The general features of the data are reproduced by a mean-field and Monte-Carlo calculations. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Keio Univ, Dept Phys, Kohoku Ku, Yokohama, Kanagawa 223, Japan. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wakabayashi, N (reprint author), Keio Univ, Dept Phys, Kohoku Ku, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223, Japan. NR 7 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 517 EP 523 DI 10.1016/S0921-4526(97)00632-7 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600147 ER PT J AU Dai, PC Mook, HA Dogan, F AF Dai, PC Mook, HA Dogan, F TI Pseudogap and incommensurate magnetic fluctuations in YBa2Cu3O6.6 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE high-Tc superconductivity; magnetic excitations ID NEUTRON-SCATTERING; SPIN SUSCEPTIBILITY; EXCITATIONS AB Unpolarized inelastic neutron scattering is used to study the temperature and wave vector dependence of the dynamical magnetic susceptibility, chi "(q, omega), of a well-characterized single-crystal YBa2Cu3O6.6 (T-c = 62.7 K). We find that a pseudogap opens in the spin-fluctuation spectrum at temperatures well above T-c. We speculate that the appearance of the low-frequency incommensurate fluctuations is associated with the opening of the pseudogap. To within the error of the measurements, a gap in the spin-fluctuation spectrum is found in the superconducting state. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA. RP Dai, PC (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM piq@ornl.gov RI Dai, Pengcheng /C-9171-2012 OI Dai, Pengcheng /0000-0002-6088-3170 NR 20 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 524 EP 527 DI 10.1016/S0921-4526(97)00633-9 PG 4 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600148 ER PT J AU Nishi, M Kakurai, K Fujii, Y Yethiraj, M Tennant, DA Nagler, SE Fernandez-Baca, JA Fujita, O Akimitsu, J AF Nishi, M Kakurai, K Fujii, Y Yethiraj, M Tennant, DA Nagler, SE Fernandez-Baca, JA Fujita, O Akimitsu, J TI Magnetic excitation of CuGeO3 under applied pressure SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin-Peierls CuGeO3; high pressure; magnetic excitation ID SPIN-PEIERLS STATE; COMPOUND CUGEO3 AB Magnetic excitations of the spin-Peierls compound CuGeO3 under applied pressure of 2 GPa have been studied. The dispersion along the chain direction up to the zone boundary has been obtained. The spin-Peierls gap energy increases to 4.2 meV and the zone boundary energy decreases to 14.1 meV. The pressure dependence of dispersion relation can be interpreted by the increase of the next-nearest-neighbor intra-chain interaction under applied pressure causing the increase of both the spin-Peierls gap energy and transition temperature. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Tokyo, Inst Solid State Phys, Neutron Scattering Lab, Tokai, Ibaraki 31911, Japan. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 157, Japan. RP Nishi, M (reprint author), Univ Tokyo, Inst Solid State Phys, Neutron Scattering Lab, 106-1 Shirakata, Tokai, Ibaraki 31911, Japan. EM nishi@red.issp.u-tokyo.ac.jp RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Fernandez-Baca, Jaime/C-3984-2014; Tennant, David/Q-2497-2015 OI Nagler, Stephen/0000-0002-7234-2339; Fernandez-Baca, Jaime/0000-0001-9080-5096; Tennant, David/0000-0002-9575-3368 NR 11 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 537 EP 539 DI 10.1016/S0921-4526(97)00637-6 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600152 ER PT J AU Garrett, AW Nagler, SE Tennant, DA Barnes, T Torardi, CC AF Garrett, AW Nagler, SE Tennant, DA Barnes, T Torardi, CC TI Magnetic excitations in (VO)DPO4 center dot 1/2D(2)O SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin dimer; vanadium compound; magnetism ID (VO)2P2O7 AB The magnetic excitations of an antiferromagnetic spin-dimer system, (VO)DPO4.1/2D(2)O, are examined using inelastic neutron scattering technique. A dispersionless mode is found, consistent with our expectations for a dimer excitation. The intensity variation of the mode reveals a V4+-V4+ dimer separation of 4.43 Angstrom, almost 50% larger than the originally expected length. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Florida, Dept Phys, Gainesville, FL 32611 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Dupont Co, Cent Res & Dev, Wilmington, DE 19880 USA. RP Garrett, AW (reprint author), Univ Florida, Dept Phys, Gainesville, FL 32611 USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Tennant, David/Q-2497-2015 OI Nagler, Stephen/0000-0002-7234-2339; Tennant, David/0000-0002-9575-3368 NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 552 EP 554 DI 10.1016/S0921-4526(97)00641-8 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600157 ER PT J AU Nagler, SE Mandrus, DG Tennant, DA AF Nagler, SE Mandrus, DG Tennant, DA TI Spin waves in CsVBr3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin waves; one-dimensional; magnetic excitations ID MAGNETIC EXCITATIONS; NEUTRON-SCATTERING; CSVCL3 AB Inelastic neutron scattering has been used to measure spin wave excitations in the quasi-one-dimensional S = 3/2 magnetic material CsVBr3. Dispersion relations were determined using standard triple-axis methods. Fits to linear spin wave theory yield model Hamiltonian parameters describing magnetic interactions in the system. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Nagler, SE (reprint author), Oak Ridge Natl Lab, Div Solid State, POB 2008, Oak Ridge, TN 37831 USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Mandrus, David/H-3090-2014; Tennant, David/Q-2497-2015 OI Nagler, Stephen/0000-0002-7234-2339; Tennant, David/0000-0002-9575-3368 NR 4 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 561 EP 562 DI 10.1016/S0921-4526(97)00644-3 PG 2 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600160 ER PT J AU Raymond, S Bao, W Shapiro, SM Motoya, K AF Raymond, S Bao, W Shapiro, SM Motoya, K TI Spin dynamics of the re-entrant spin glass Fe0.7Al0.3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin glass; Fe0.7Al0.3; spin waves ID SCATTERING; NEUTRON AB Inelastic neutron scattering experiments are reported to study magnetic excitations in a single crystal of the re-entrant spin glass Fe0.7Al0.3 near the (111) Bragg peak. In the ferromagnetic phase, the magnetic excitation spectrum is separated in two areas: at low q, spin waves are propagating and at higher q, the response is quasielastic-like. In the spin glass phase, the response is always quasielastic. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Sci Univ Tokyo, Noda, Chiba 278, Japan. RP Raymond, S (reprint author), Brookhaven Natl Lab, Dept Phys, Bldg 510B,POB 5000, Upton, NY 11973 USA. RI Bao, Wei/E-9988-2011 OI Bao, Wei/0000-0002-2105-461X NR 6 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 597 EP 599 DI 10.1016/S0921-4526(97)00874-0 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600172 ER PT J AU Tixier, S Boni, P Endoh, Y Roessli, B Shirane, G AF Tixier, S Boni, P Endoh, Y Roessli, B Shirane, G TI Polarisation dependence of the magnetic fluctuations in the weak itinerant ferromagnet MnSi below T-c SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE ferromagnet; spin waves; itinerant; polarised neutrons ID SPIN FLUCTUATIONS AB The dispersion of the spin-flip and non-spin-flip excitations in the weak itinerant ferromagnet MnSi has been measured in the ferromagnetic phase using inelastic polarised neutron scattering techniques. Because of the steep dispersion curve, the excitations have been determined by means of constant energy scans between 0 and 7 meV. The decrease of the intensity of the spin-flip excitations with increasing energy can be explained by the interaction of the spin waves with the Stoner excitations. The interpretation of the non-spin-flip scattering is a more difficult task because of the low intensify. The non-spin-flip excitations are clearly quasielastic at small E-transfer as in a localised ferromagnet. Their spectral weight is significant near T-C. (C) 1998 Elsevier Science B.V. All rights reserved. C1 ETH Zurich, Lab Neutronenstreuung, CH-5232 Villigen, Switzerland. PSI, CH-5232 Villigen, Switzerland. Tohoku Univ, Dept Phys, Sendai, Miyagi 980, Japan. Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tixier, S (reprint author), ETH Zurich, Lab Neutronenstreuung, CH-5232 Villigen, Switzerland. NR 4 TC 1 Z9 1 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 613 EP 615 DI 10.1016/S0921-4526(97)00659-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600177 ER PT J AU Boni, P Sternlieb, BJ Roessli, B Lorenzo, JE Shirane, G Werner, SA AF Boni, P Sternlieb, BJ Roessli, B Lorenzo, JE Shirane, G Werner, SA TI Polarisation dependence of the spin-density-wave excitations in single-domain chromium SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE antiferromagnetism; incommensurate; itinerant; polarized neutrons AB A polarised neutron scattering experiment has been performed on a single-Q, single domain sample of Cr in a magnetic field of 4 T in the transverse spin-density-wave phase. It is confirmed that the longitudinal fluctuations are enhanced for energy transfers E < 8 meV similarly as in the longitudinal spin-density-wave phase. The transverse modes with delta S parallel and perpendicular to Q are isotropic within the E-range investigated. (C) 1998 Elsevier Science B.V. All rights reserved. C1 ETH Zurich, Lab Neutronenstreuung, CH-5232 Villigen, Switzerland. PSI, CH-5232 Villigen, Switzerland. Brookhaven Natl Lab, Upton, NY 11973 USA. Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France. CNRS, Crystallog Lab, F-38042 Grenoble, France. Univ Missouri, Dept Phys, Columbia, MO 65211 USA. RP Boni, P (reprint author), ETH Zurich, Lab Neutronenstreuung, CH-5232 Villigen, Switzerland. NR 5 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 616 EP 618 DI 10.1016/S0921-4526(97)00660-1 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600178 ER PT J AU Lee, WT Werner, SA Fernandez-Baca, JA Fishman, RS AF Lee, WT Werner, SA Fernandez-Baca, JA Fishman, RS TI Excitations of the transversely polarized spin density waves in chromium SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE inelastic neutron scattering; magnetic excitations; spin density wave; chromium; itinerant magnetism ID DYNAMICS; ALLOYS; CR AB We report here the results of an inelastic neutron scattering experiment of the magnetic excitations of the transversely polarized spin density wave (TSDW) in chromium in zero applied field and a 5 T field. Our results show that the mode with spin fluctuations perpendicular to both the ordered moment m and the TSDW ordering vector Q, and the mode with spin fluctuations parallel to m are equally intense. However, the mode with spin fluctuation perpendicular to m, but parallel to Q is the most intense excitation. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Univ Missouri, Dept Phys, Columbia, MO 65211 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Lee, WT (reprint author), Univ Missouri, Dept Phys, Columbia, MO 65211 USA. RI Fishman, Randy/C-8639-2013; Fernandez-Baca, Jaime/C-3984-2014 OI Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 9 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 622 EP 624 DI 10.1016/S0921-4526(97)00662-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600180 ER PT J AU Noakes, DR Fawcett, E Sternlieb, BJ Shirane, G Jankowska-Kisielinska, J AF Noakes, DR Fawcett, E Sternlieb, BJ Shirane, G Jankowska-Kisielinska, J TI Nature of the triple point in chromium alloys: Mode-softening of the incommensurate spin-density wave SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE chromium alloys; critical behavior; magnetic phase diagram; triple-axis neutron scattering ID PERCENT-V; TRANSITION; DYNAMICS; CR; SYSTEM; LITBF4; ORDER; RE AB The magnetic stiffness parameter, A(2), associated with the critical fluctuations in the paramagnetic phase close to the incommensurate spin-density-wave (SDW) transition of a Cr + 0.18 at% Re single crystal, when compared with that of pure chromium and dilute alloys of vanadium in chromium, indicates that the singularity responsible for the onset of the commensurate SDW phase occurs when A(2) approaches zero at a finite value of the incommensurability parameter, delta congruent to 0.017 rlu, instead of zero as usually assumed. The mode of the incommensurate SDW softens as delta approaches this critical value with rhenium doping, and conversely hardens as delta increases when vanadium is added to chromium. Also, the amplitude of the critical scattering increases as delta approaches its end point, by a factor of about two going from 0.2 and 0.5 at% V to pure chromium, and by another factor near two in going from pure Cr to Cr+0.18 at% Re. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Virginia State Univ, Dept Phys, Petersburg, VA 23806 USA. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Inst Nucl Res SWIERK, PL-05400 Otwock, Poland. RP Noakes, DR (reprint author), Virginia State Univ, Dept Phys, Box 9325, Petersburg, VA 23806 USA. NR 22 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 625 EP 627 DI 10.1016/S0921-4526(97)00663-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600181 ER PT J AU Dervenagas, P Paolasini, L Hiess, A Lander, GH Panchula, A Canfield, PC AF Dervenagas, P Paolasini, L Hiess, A Lander, GH Panchula, A Canfield, PC TI Competing exchange interactions in ferromagnetic CeFe2 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE itinerant; ferromagnets; exchange interactions ID INTERMETALLIC COMPOUNDS; MAGNETISM; CE(FE1-XCOX)2 AB We have measured the dispersion curves of the Fe spin-wave mode in the itinerant ferromagnet CeFe2 (T-C = 235 K). The only mode observed is that involving the Fe sublattice. The Fe mode has a gap of similar to 0.2 meV at the magnetic zone center. which is independent of temperature, and the spin-wave stiffness is similar to 150 meV Angstrom(2) at small q, a value of about half that found in YFe2 and all other rare-earth-Fe-2 compounds. The most unusual feature is that the dispersion along the [1 1 1] direction has another minimum at q = [1/2 1/2 1/2]. This observation implies that there are also strong antiferromagnetic fluctuations in this material. (C) 1998 Elsevier Science B.V. All rights reserved. C1 CEA Grenoble, Dept Rech Fond Mat Condensee, F-38054 Grenoble, France. Commiss European Communities, JRC, Inst Transuranium Elements, D-76125 Karlsruhe, Germany. Ctr Etud Saclay, CEA, CRNS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RP Dervenagas, P (reprint author), CEA Grenoble, Dept Rech Fond Mat Condensee, F-38054 Grenoble, France. EM dervenag@drfmc.ceng.cea.fr RI Canfield, Paul/H-2698-2014 NR 10 TC 0 Z9 0 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 649 EP 650 DI 10.1016/S0921-4526(97)00680-7 PG 2 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600189 ER PT J AU Loong, CK Nipko, JC Goodman, GL Wang, JY Liu, YG Jiang, SS AF Loong, CK Nipko, JC Goodman, GL Wang, JY Liu, YG Jiang, SS TI Phonon and magnetic excitations in neodymium pentaphosphate SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE rare-earth pentaphosphate; ultraphosphate; crystal fields; PO4 chains AB The structure of NdP5O14 consists of cross-linked double chains of corner-sharing PO4 tetrahedra extending parallel to the crystallographic a-axis. Each Nd atom is coordinated by eight O atoms. The NdO8 polyhedra are isolated from each other and share no common O atoms. High-gain and long-lifetime laser action had been reported in NdP5O14 crystals. The neutron excitation spectra reveal a one-phonon density of states extended to about 180 meV with several distinct P-O stretching bands at high energies. These features reflect the existence of different P-O bond lengths among the terminal and bridging configurations and the associated atomic dynamics. Furthermore, magnetic scattering from Nd ions permitted the determination of the energy-level structure of the crystal-field-split Nd:I-4(9/2) ground multiplet. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Shandong Univ, Jinan 250100, Peoples R China. Nanjing Univ, Nanjing 210008, Peoples R China. RP Loong, CK (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 2 Z9 2 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 666 EP 668 DI 10.1016/S0921-4526(97)00686-8 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600195 ER PT J AU Nakotte, H Bull, M McEwen, KA Robinson, RA Swan, T Kelley, TM Eccleston, RS Bruck, E AF Nakotte, H Bull, M McEwen, KA Robinson, RA Swan, T Kelley, TM Eccleston, RS Bruck, E TI Localized excitations in UPdSn SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE inelastic neutron scattering; crystal fields; UPdSn AB We have measured the inelastic-neutron-scattering response of UPdSn using the HET and PHAROS spectrometers at the ISIS and LANSCE facilities, respectively. UPdSn shows some quasielastic scattering, which may be attributed to the hybridization of the Sf-electrons with the conduction electrons. We also find a clear excitation around 40 meV above 40 K. This excitation may be indicative of localized crystal fields in UPdSn, but its strong temperature dependence seems to contradict a simple crystal-held picture. Below T-N, an unusual temperature dependence may be attributed to magnetically driven distortions (and subsequent changes in the local surrounding of the U-ions), but there is some evidence that other additional mechanism(s) may contribute above T-N. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. Univ London Birkbeck Coll, Dept Phys, London WC1E 7HX, England. Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England. Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands. RP Nakotte, H (reprint author), Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. EM nakotte_heinz@msmail.lansce.lanl.gov RI Bruck, Ekkes/E-3365-2014 NR 7 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 675 EP 677 DI 10.1016/S0921-4526(97)00689-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600198 ER PT J AU Prokes, K Sechovsky, V Robinson, RA Sonntag, R Svoboda, P de Boer, FR AF Prokes, K Sechovsky, V Robinson, RA Sonntag, R Svoboda, P de Boer, FR TI Commensurate and incommensurate magnetic order of UPdSi SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE UPdSi; antiferromagnetism; incommensurate order AB UPdSi was studied by the neutron powder diffraction. It crystallises with the orthorhombic TiNiSi-type structure and exhibits two magnetic phase transitions (27 and 33 K). The ground state is commensurate antiferromagnetic with q = (0.25, 0, 0.25). U moments (1.40 mu(B), at 3.5 K) are oriented along the b-axis. Between 27 and 33 K we observe an incommensurate phase with q(inc) = (delta, 0, delta). At 31 K, delta = 0.217 and mu(U) = 0.65 mu(B) parallel to b. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Charles Univ, Dept Met Phys, CR-12116 Prague 2, Czech Republic. Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands. Univ Calif Los Alamos Natl Lab, MLNSC, Los Alamos, NM 87545 USA. Hahn Meitner Inst Kernforsch Berlin GmbH, BENSC, D-14109 Berlin 39, Germany. RP Prokes, K (reprint author), Charles Univ, Dept Met Phys, KE Karlovu 5, CR-12116 Prague 2, Czech Republic. RI Sechovsky, Vladimir/A-5256-2008 OI Sechovsky, Vladimir/0000-0003-1298-2120 NR 4 TC 3 Z9 3 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 687 EP 689 DI 10.1016/S0921-4526(97)00692-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600202 ER PT J AU Skanthakumar, S Lynn, JW Mazumdar, C Nagarajan, R Gupta, LC AF Skanthakumar, S Lynn, JW Mazumdar, C Nagarajan, R Gupta, LC TI Magnetic phase transitions in R2Ni3Si5 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE magnetic order; neutron diffraction; magnetic transitions ID MAGNETORESISTANCE AB Neutron diffraction has been used to investigate the magnetic and crystal structures in R2Ni3Si5 (R = Pr, Nd, Tb, Dy, Ho). Our high-resolution data indicate that this system crystallizes in the Ibam space group. Pr orders antiferromagnetically at T-N = 8.8 K, with a magnetic unit cell that is double the chemical unit cell along the b direction. The magnetic and chemical unit cells are the same for the Nd spins, which order at 9.6 K. Tb first orders with an incommensurately modulated structure at 19 K, and then changes to a commensurate structure at 12.2 K. An incommensurate structure is also observed for Dy, which orders at 9 K, with a lock-in transition at similar to 4 K. The Ho system has an incommensurate structure with an ordering temperature of 6.9 K. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA. Univ Maryland, Ctr Superconduct Res, Dept Phys, College Pk, MD 20742 USA. Indian Inst Technol, Dept Phys, Mumbai 400089, India. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. RP Skanthakumar, S (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 693 EP 695 DI 10.1016/S0921-4526(97)00694-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600204 ER PT J AU Goldman, KI Kepa, H Giebultowicz, TM Sinha, SK AF Goldman, KI Kepa, H Giebultowicz, TM Sinha, SK TI Numerical simulation of neutron diffraction from correlated/uncorrelated magnetic multilayers SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE antiferromagnetic superlattices; antiferromagnetic domains; neutron diffraction; interlayer spin coherence AB We report stochastic diffraction simulations of magnetic multilayered systems. Results show that spectrum fringes from a system of many magnetic domains is a non-random effect -i.e., such fringes cannot occur in the total absence of interlayer spill correlations. Simulation of diffraction spectra from superlattices with interlayer coupling probability 0 < p < 1 (an analogy of short-range ordering in magnetic crystals) is also performed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Oregon State Univ, Dept Phys, Corvallis, OR 97331 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Goldman, KI (reprint author), Oregon State Univ, Dept Phys, Corvallis, OR 97331 USA. NR 3 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 717 EP 718 DI 10.1016/S0921-4526(97)00702-3 PG 2 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600212 ER PT J AU Petrenko, OA Ritter, C Yethiraj, M McK Paul, D AF Petrenko, OA Ritter, C Yethiraj, M McK Paul, D TI Spin-liquid behavior of the gadolinium gallium garnet SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin-liquid; frustration; neutron diffraction ID MAGNET AB Neutron diffraction from a powder sample of Gd3Ga5O12 (GGG) has been measured. Due to the severe degree of magnetic frustration, GGG supports a short-range magnetic order (spin-liquid) over a wide temperature range, 140 mK-5 K. Neutron diffraction shows that at temperatures below 140 mK the magnetic system undergoes a partial transition to a phase with a much longer correlation length. However, even at the lowest temperature (43 mK) true long-range magnetic order is absent. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Petrenko, OA (reprint author), Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. RI Petrenko, Oleg/E-2717-2013 OI Petrenko, Oleg/0000-0003-1529-303X NR 3 TC 8 Z9 8 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 727 EP 729 DI 10.1016/S0921-4526(97)00705-9 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600216 ER PT J AU Tranquada, JM AF Tranquada, JM TI Modulated spin and charge densities in cuprate superconductors SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE superconductivity; antiferromagnetism; charge order ID NEUTRON-SCATTERING; MAGNETIC FLUCTUATIONS; SYSTEM YBA2CU3O6+X; LA1.85SR0.15CUO4; SUSCEPTIBILITY; DEPENDENCE; DYNAMICS; HOLES; STATE; LA2-XSRXCUO4 AB Neutron scattering experiments have played a crucial role in characterizing the spin and charge correlations in copper oxide superconductors. While the data are often interpreted with respect to specific theories of the cuprates, an attempt is made here to distinguish those facts that can be extracted empirically, and the connections that can be made with minimal assumptions. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Tranquada, JM (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 44 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 745 EP 750 DI 10.1016/S0921-4526(97)00711-4 PG 6 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600222 ER PT J AU Medarde, M Lacorre, P Conder, K Rodriguez-Carvajal, J Rosenkranz, S Fauth, F Furrer, A AF Medarde, M Lacorre, P Conder, K Rodriguez-Carvajal, J Rosenkranz, S Fauth, F Furrer, A TI Evidence for electron-lattice coupling in RNiO3 perovskites SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE isotope effect; Jahn-Teller effect; orbital ordering; metal-insulator transition ID DIFFRACTION; PRNIO3 AB In order to get additional insight into the origin of the metal-insulator transition in RNiO3 perovskites we have investigated (a) the stability of the magnetic structure against the proximity of the metallic state and (b) the effect of the oxygen isotope mass on the metal-insulator transition temperature T-MI. The observation of the same kind of magnetic ordering in the four nickelates studied (PrNiO3, NdNiO3 with T-MI = T-N, and (SmNiO3)-Sm-154, (EuNiO3)-Eu-153 with T-N < T-MI), as well as the unusually large, rare-earth-dependent O-16-O-18 isotope shift we found in these materials (Delta T-MI less than or equal to + 10.3 K) strongly support the electron-lattice interaction as the driving force for the metal-insulator transition. The possibility of a dynamic to static Jahn-Teller transition is discussed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 ETH Zurich, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Univ Maine, Lab Fluorures, UPRESA CNRS 6010, F-72085 Le Mans, France. ETH Zurich Honggerberg, Festkorperphys Lab, CH-8093 Zurich, Switzerland. CENS, CEA, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France. Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France. RP Medarde, M (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Rodriguez-Carvajal, Juan/C-4362-2008; Rosenkranz, Stephan/E-4672-2011; Fauth, Francois/K-9643-2014 OI Rodriguez-Carvajal, Juan/0000-0001-5582-2632; Rosenkranz, Stephan/0000-0002-5659-0383; Fauth, Francois/0000-0001-9465-3106 NR 16 TC 2 Z9 2 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 751 EP 757 DI 10.1016/S0921-4526(97)00712-6 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600223 ER PT J AU Matsuda, M AF Matsuda, M TI Neutron scattering studies of the chains and ladders in Sr14Cu24O41 and related compounds SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE quasi-one-dimensional magnet; neutron scattering; dimerized state ID SPIN GAP; SUPERCONDUCTIVITY; STATE AB A review of the neutron scattering studies on the S = 1/2 quasi-one-dimensional magnet Sr14Cu24O41 and related compounds which have both simple chains and two-leg ladders of copper ions is given. Both of the building blocks show interesting singlet ground states and magnetic excitations. In this system it is possible to change the number of hole carriers by substitution for Sr. A dramatic change has been observed in the ground state and the magnetic excitations with decreasing the number of holes. (C) 1998 Elsevier Science B.V. All rights reserved. C1 RIKEN, Inst Phys & Chem Res, Wako, Saitama 35101, Japan. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Matsuda, M (reprint author), RIKEN, Inst Phys & Chem Res, Wako, Saitama 35101, Japan. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 24 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 758 EP 764 DI 10.1016/S0921-4526(97)00713-8 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600224 ER PT J AU Hayden, SM Aeppli, G Dai, P Mook, HA Perring, TG Cheong, SW Fisk, Z Dogan, F Mason, TE AF Hayden, SM Aeppli, G Dai, P Mook, HA Perring, TG Cheong, SW Fisk, Z Dogan, F Mason, TE TI Absolute measurements of the high-frequency magnetic dynamics in high-T-c superconductors SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE spin-waves; high temperature superconductors; 2-D antiferromagnets; quantum corrections ID NEUTRON-SCATTERING; HEISENBERG-ANTIFERROMAGNET; SPIN-WAVES; YBA2CU3O6+X; FLUCTUATIONS; EXCITATIONS; LA2CUO4 AB We review recent measurements of the high-frequency dynamic magnetic susceptibility in the high-T-c superconducting systems La2-xSrxCuO4 and YBa2Cu3O6+x. Experiments were performed using the chopper spectrometers HET and MARI at the ISIS spallation source. We have placed our measurements on an absolute intensity scale; this allows systematic trends to be seen and comparisons with theory to be made. We find that the insulating S = 1/2 antiferromagnetic parent compounds show a dramatic renormalization of the spin wave intensity. The effect of doping on the response is to cause broadenings in wave vector and large redistributions of spectral weight in the frequency spectrum. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. NEC Res Inst, Princeton, NJ 08540 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. RP Hayden, SM (reprint author), Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England. EM s.hayden@bris.ac.uk RI Hayden, Stephen/F-4162-2011; Dai, Pengcheng /C-9171-2012; Mason, Thomas/M-5809-2014 OI Hayden, Stephen/0000-0002-3209-027X; Dai, Pengcheng /0000-0002-6088-3170; Mason, Thomas/0000-0003-1880-3971 NR 23 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 765 EP 772 DI 10.1016/S0921-4526(97)00714-X PG 8 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600225 ER PT J AU Bozin, ES Billinge, SJL Kwei, GH AF Bozin, ES Billinge, SJL Kwei, GH TI Re-examination of the second-order structural phase transition in La(2-x)A(x)CuO(4) (A = Ba,Sr) SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE local structure; pair distribution function analysis; structural phase transition; high temperature superconductors ID NEUTRON-POWDER-DIFFRACTION AB In the high temperature tetragonal phase of La1.85Ba0.15CuO4 (LBCO) and La1.875Sr0.125CuO4 (LSCO), the average octahedral tilts disappear at high temperature. However, we show that, locally, tilts remain at temperatures well above the orthorhombic to tetragonal phase transition. We have used full profile refinement of the real-space atomic pair distribution function (PDF) obtained from pulsed neutron powder diffraction measurements. Our modeling indicates that order-disorder models of the octahedral tilts give significantly better agreement with the data than displacive models. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Bozin, ES (reprint author), Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. RI Bozin, Emil/E-4679-2011 NR 8 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 795 EP 797 DI 10.1016/S0921-4526(97)00720-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600231 ER PT J AU Bullock, M Stassis, C Zarestky, J Goldman, A Canfield, PC Shirane, G Shapiro, S AF Bullock, M Stassis, C Zarestky, J Goldman, A Canfield, PC Shirane, G Shapiro, S TI Inelastic neutron studies of the low-energy phonon excitations in the RENi2B2C superconductors (RE = Lu,Y,Ho,Er) SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE phonon anomalies; superconductivity AB We studied the low-energy phonon excitations for wave vectors close to the Fermi surface nesting vector xi(m) congruent to 0.55a. We find that above T-c the frequencies of the Delta(4)[zeta 00] lowest-lying optical and acoustic phonon modes decrease with decreasing temperature, for xi close to xi(m), and there is a shift of intensity from the upper to the lower mode, an effect characteristic of coupled modes. From approximately 120 K down to temperatures in the vicinity of T-c, only a single unresolved peak is observed. Below T-c, the phonon spectra of the Y and Lu compounds change dramatically: they consist of a sharp peak at approximately 4.5 meV with a weak shoulder at the higher-energy side. No such sharp peak was observed below T-c in the Ho and Er compounds. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Iowa State Univ, Dept Phys, Ames, IA 50011 USA. RP Stassis, C (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. EM stassis@ameslab.gov RI Canfield, Paul/H-2698-2014 NR 8 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 798 EP 801 DI 10.1016/S0921-4526(97)00721-7 PG 4 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600232 ER PT J AU Chmaissem, O Jorgensen, JD Hinks, DG Wagner, JL Dabrowski, B Mitchell, JF AF Chmaissem, O Jorgensen, JD Hinks, DG Wagner, JL Dabrowski, B Mitchell, JF TI Evidence for two competing defects in HgBa2CuO4+delta SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE neutron powder diffraction; superconducting properties; defects; electronic topological transition; van Hove singularity ID CRYSTAL-STRUCTURE; SUPERCONDUCTIVITY AB The defect structure of HgBa2CuO4+delta has been investigated by neutron powder diffraction. By varying the P(O-2)'s over a wide range during annealing, the oxygen content can be modified to both underdope and overdope the compound. Our data give evidence for the presence of at least two defects that contribute to doping. The competition between the two defects results in a "plateau" in the region of maximum T-c. This plateau can be explained by a change in the defect chemistry that results in a constant T-c (at T-c max) for different amounts of total defect oxygen. This could be interpreted as being due to an electronic topological transition when the van Hove singularity is crossed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Sci & Technol Ctr Superconductiv, Argonne, IL 60439 USA. Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. Univ N Dakota, Dept Phys, Grand Forks, ND 58202 USA. No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. RP Chmaissem, O (reprint author), Argonne Natl Lab, Sci & Technol Ctr Superconductiv, Argonne, IL 60439 USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 805 EP 807 DI 10.1016/S0921-4526(97)00723-0 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600234 ER PT J AU Louca, D Egami, T AF Louca, D Egami, T TI Lattice effect in the metal-insulator transition in CMR manganites SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE JT distortion; lattice polarons ID LA1-XSRXMNO3; RESISTIVITY AB The atomic pair density function (PDF) of La1-xSrxMnO3 determined by pulsed neutron diffraction shows that the local structure significantly deviates from the average structure. In particular, the Jahn-Teller (JT) distortion locally persists even when the crystallographic structure shows no evidence of JT distortion. The existence of the local JT distortions is directly related to the formation of lattice polarons. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA. RP Louca, D (reprint author), Univ Calif Los Alamos Natl Lab, MST-10,MS K764, Los Alamos, NM 87545 USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 842 EP 844 DI 10.1016/S0921-4526(97)00734-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600246 ER PT J AU Osborn, R Aronson, MC Rainford, BD Maple, MB Chau, R Andersen, KH AF Osborn, R Aronson, MC Rainford, BD Maple, MB Chau, R Andersen, KH TI Quantum critical scattering in uranium non-Fermi liquid compounds SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE non-Fermi liquids; quantum phase transitions ID BEHAVIOR; ROUTE AB Our recent observation of universal scaling in omega/T of the magnetic response of the non-Fermi liquid compound UCu5-xPdx provides evidence of single-impurity quantum critical fluctuations of the uranium Sf-electrons. The scaling is observed over a wide range of frequencies from similar to 1 to 25 meV, and a wide range of temperatures from similar to 10 to 300 K, with evidence of a cross-over to more conventional moment fluctuations above 25 meV. We now have evidence from measurements with full polarization analysis of the development of antiferromagnetic correlations below 10 K in UCu4Pd, but not in UCu3.5Pd1.5, indicating the cross-over from the quantum critical regime to a low-temperature quantum-disordered regime as predicted by phenomenological theories of quantum phase transitions. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Univ Southampton, Southampton SO17 1BJ, Hants, England. Univ Calif San Diego, San Diego, CA 92093 USA. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. RP Osborn, R (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 859 EP 861 DI 10.1016/S0921-4526(97)00854-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600252 ER PT J AU Wochner, P Tranquada, JM Buttrey, DJ Sachan, V AF Wochner, P Tranquada, JM Buttrey, DJ Sachan, V TI Stripe order of holes and spins in oxygen-doped nickelates SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE antiferromagnetism; spin-density waves; charge-density waves; strongly correlated electron systems ID MAGNETIC CORRELATIONS; LA1.8SR0.2NIO4; LA2NIO4.125 AB We present a detailed neutron-scattering study of the ordering of spins and holes in oxygen-doped La2NiO4.133. The temperature dependence of the stripe spacing, the width of the stripes and the extent of their pinning to the lattice are investigated. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA. RP Wochner, P (reprint author), Brookhaven Natl Lab, Dept Phys, Bldg 510B, Upton, NY 11973 USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 13 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 877 EP 879 DI 10.1016/S0921-4526(97)00743-6 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600258 ER PT J AU Loong, CK Suzuya, K Price, DL Sales, BC Boatner, LA AF Loong, CK Suzuya, K Price, DL Sales, BC Boatner, LA TI Structure and dynamics of phosphate glasses: from ultra- to orthophosphate composition SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE phosphate glasses; inorganic polymer; intermediate-range ordering; extended-range ordering ID LEAD-INDIUM PHOSPHATE; CHEMICAL CHARACTERISTICS; ULTRAPHOSPHATE GLASSES; INFRARED-SPECTRA; VITREOUS P2O5; SPECTROSCOPY AB The short-and intermediate-range order as well as the atomic dynamics in various phosphate glasses were investigated using neutron diffraction and inelastic scattering. The 3-D network of corner-sharing PO4 tetrahedra in g-P2O5 is highly unstable and hygroscopic. Depolymerization of the network to a chain-like structure and eventually to unconnected PO4 units by incorporating alkali, alkali-earth or transition-metal modifiers is clearly evident in the structure factor S(Q) in the Q < 4 Angstrom(-1) region. The dynamic response to such structural changes is equally strong: e.g., the broad P-O stretching band extending to 170 meV in g-P2O5 is sharpened and shifted down to similar to 125 meV in the orthophosphate composition. The correlation between the microscopic structure and physical properties for a series of P-glasses is discussed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, IPNS, Argonne, IL 60439 USA. Japan Atom Energy Res Inst, Ako, Hyogo 67822, Japan. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Loong, CK (reprint author), Argonne Natl Lab, IPNS, Bldg 360, Argonne, IL 60439 USA. RI Price, David Long/A-8468-2013; OI Boatner, Lynn/0000-0002-0235-7594 NR 48 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 890 EP 896 DI 10.1016/S0921-4526(97)00747-3 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600261 ER PT J AU Benmore, CJ Sweeney, S Robinson, RA Egelstaff, PA Suck, JB AF Benmore, CJ Sweeney, S Robinson, RA Egelstaff, PA Suck, JB TI Constant Q measurements of collective modes in Mg70Zn30 glass SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE glasses; inelastic; excitations; phonons ID NEUTRON BRILLOUIN-SCATTERING; METALLIC-GLASS; DISPERSION AB In this study the neutron Brillouin scattering technique has been used to measure longitudinal excitations in a magnesium-zinc glass at momentum transfers within the first pseudo-Brillouin zone. The measurements were performed at room temperature and constant momentum transfer, which enables the data to be readily and reliably compared with theory. The experimental results taken down to Q = 6.2 nm(-1) and E = 27 meV show a 5 meV downward shift in the dispersion energy of the longitudinal 'optic' mode of the glass when compared to theoretical predictions. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0HR, Oxon, England. Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Calif Los Alamos Natl Lab, LANSCE, Los Alamos, NM 87545 USA. TU Chemnitz Zwickau, Inst Phys, D-09107 Chemnitz, Germany. RP Benmore, CJ (reprint author), Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0HR, Oxon, England. OI Benmore, Chris/0000-0001-7007-7749 NR 6 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 912 EP 914 DI 10.1016/S0921-4526(97)00751-5 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600266 ER PT J AU Schneider, S Thiyagarajan, P Geyer, U Johnson, WL AF Schneider, S Thiyagarajan, P Geyer, U Johnson, WL TI SANS of bulk metallic ZrTiCuNiBe glasses SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE SANS; bulk metallic glasses; decomposition; crystallization ID SUPERCOOLED LIQUID; ALLOY; ZR41.2TI13.8CU12.5NI10.0BE22.5; TRANSITION AB The evolution of decomposition and succeeding primary crystallization in the bulk amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy have been studied by small-angle neutron scattering. Samples annealed isothermally in the supercooled liquid and in the solid-state exhibit correlation peaks indicating quasiperiodic inhomogeneities in the scattering length density. The peak positions vary as a function of temperature as predicted by the linear Cahn-Hilliard theory of spinodal decomposition. Variations of the Be-Ti composition ratio of the alloy leads to significant changes in scattering signals. The initially homogeneous alloy separates into two amorphous phases. In the decomposed regions, crystallization probability increases leading to polymorphic crystallization. Published by Elsevier Science B.V. C1 Argonne Natl Lab, IPNS Div, Argonne, IL 60439 USA. Univ Gottingen, D-37073 Gottingen, Germany. SFB, D-37073 Gottingen, Germany. CALTECH, Pasadena, CA 91125 USA. RP Thiyagarajan, P (reprint author), Argonne Natl Lab, IPNS Div, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 11 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 918 EP 920 DI 10.1016/S0921-4526(97)00753-9 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600268 ER PT J AU Pilgrim, WC Ross, M Yang, LH AF Pilgrim, WC Ross, M Yang, LH TI The formation of a molecular state in expanded liquid rubidium SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE inelastic neutron scattering; liquid metals; high temperature ID MAGNETIC-SUSCEPTIBILITY; DYNAMIC STRUCTURE; METALS; TRANSITION; NITROGEN; CESIUM; CURVES AB Inelastic neutron scattering experiments have been carried out on expanded liquid rubidium in a density range between the melting point density and about twice the critical density. The dynamics of the liquid show metallic-like behavior even at relatively low densities. In expanding the liquid further to about twice the critical density, where a breakdown of the metallic properties is expected, S(Q, omega) changes its shape considerably. It is now characterized by a localized excitation, indicating that molecules present in the dilute vapour may survive the condensation into the dense fluid. First principles total energy calculations for Rb-lattices at 0 K support this view and predict that expansion favours spin pairing leading to the formation of Rb, molecules with a continuous increase in vibron energy with decreasing density. Excellent agreement is found between the calculated vibron energy and the experimental result. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Marburg, Inst Phys Chem Nucl Chem & Macromol Chem, D-35032 Marburg, Germany. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Pilgrim, WC (reprint author), Univ Marburg, Inst Phys Chem Nucl Chem & Macromol Chem, D-35032 Marburg, Germany. NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 935 EP 939 DI 10.1016/S0921-4526(97)00757-6 PG 5 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600272 ER PT J AU Szydlowski, J Rebelo, LP Wilczura, H Dadmun, M Melnichenko, Y Wignall, GD Van Hook, WA AF Szydlowski, J Rebelo, LP Wilczura, H Dadmun, M Melnichenko, Y Wignall, GD Van Hook, WA TI Comparison of SANS and DLS hydrodynamic correlation lengths for a polystyrene/methyl-cyclohexane solution in the vicinity of temperature- or pressure-induced critical demixing SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE polystyrene; methylcyclohexane; dynamic light scattering; small-angle neutron scattering AB Phase diagrams for polystyrene(PS)/deuteromethylcyclohexane have been determined over a wide range of temperature and pressure. In this work, we report hydrodynamic and SANS correlation lengths, xi(DLS) and xi(SANS) and intensities I-DLS and I-SANS, from dynamic light and small-angle neutron scattering, respectively, along various approaches to a near-critical demixing surface,f(T*, P*)(cr). We examined isobaric, isothermal, and more complicated paths, sometimes in the hypercritical region. (At a lower hypercritical temperature partial derivative(f(T*, P*)partial derivative P = 0 and partial derivative(2)(f(T*, P*)/partial derivative P-2 > 0, and at a lower hypercritical pressure partial derivative(f(T*, P*)(cr)/partial derivative T = 0 and partial derivative(2)(f(T*, P*)(cr)/partial derivative T-2 > 0.) Both xi(DLS) and xi(SANS) diverge as(T*, P*) is approached, but the strength of the divergence depends on the direction of approach to (P*, T*)(cr). We discuss a modified scaling expression which describes the observations. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Van Hook, WA (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. EM avanhook@utk.edu RI Rebelo, Luis Paulo/B-5285-2008; OI Wignall, George/0000-0002-3876-3244; Rebelo, Luis Paulo/0000-0002-5247-2443 NR 3 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1035 EP 1037 DI 10.1016/S0921-4526(97)00789-8 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600302 ER PT J AU Baker, SM Callahan, A Smith, G Toprakcioglu, C Vradis, A AF Baker, SM Callahan, A Smith, G Toprakcioglu, C Vradis, A TI Shear effects on the geometry of polystyrene-polyethylene oxide copolymers at the solid-solvent interface SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE diblock; shear; poor solvent; neutron reflectivity ID MONTE-CARLO SIMULATION; GRAFTED POLYMER LAYERS; NEUTRON REFLECTIVITY; POOR SOLVENTS; BRUSHES; CHAIN; ADSORPTION; QUALITY AB The geometry of polystyrene (PS)-polyethylene oxide (PEO) diblock copolymers at the quartz-solvent interface has been examined as a function of solvent quality and shear by neutron reflectometry. Under conditions where a brush geometry is observed for the static PS free block, extremely large shear rates(similar to 10000/s) produce little or no effect on the structure, in agreement with the recent theoretical considerations. The geometry of the adsorbed polymer was also examined as a function of solvent quality. Under conditions where the polymer can phase separate, the effect of shear increases. Sparser PS coverage, which tends toward the mushroom geometry in good solvents, increases solvent penetration between the molecules. In poor solvents, the PS film may have lateral inhomogeneity and areas of little coverage. Again, this increased penetration of solvent is suggested to account for the increased sensitivity of the molecules to deformation tinder conditions of shear. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Harvey Mudd Coll, Dept Chem, Claremont, CA 91711 USA. LANL, LANSCE, Los Alamos, NM 87545 USA. Univ Patras, Dept Phys, GR-26110 Patras, Greece. RP Baker, SM (reprint author), Harvey Mudd Coll, Dept Chem, Claremont, CA 91711 USA. EM shenda_baker@hmc.edu NR 31 TC 6 Z9 6 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1041 EP 1047 DI 10.1016/S0921-4526(97)00844-2 PG 7 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600304 ER PT J AU Butler, PD Hamilton, WA Magid, LJ Slawecki, TM Han, Z Hayter, JB AF Butler, PD Hamilton, WA Magid, LJ Slawecki, TM Han, Z Hayter, JB TI Effect of a solid/liquid interface on bulk solution structures under flow SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE micelles; shear; flow ID MICELLES; SURFACE AB It has been known for some time that a shear field can impart enough energy to a liquid system for it to exhibit a phase change. Not as well appreciated is the fact that non-Newtonian solutions can be driven into a quasi-phase separation due to the vastly different shear rates between the bulk and near-surface regions. Using a variety of scattering techniques we have probed the interfacial and near-surface region of a system of wormlike colloidal particles under how separately from the bulk. We find that the hexagonal phase which forms under flow near the surface, does not persist into the bulk. We also present data showing substantial differences in the kinetics of alignment and relaxation of the two phases. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RP Butler, PD (reprint author), Oak Ridge Natl Lab, Div Solid State, POB 2008, Oak Ridge, TN 37831 USA. RI Butler, Paul/D-7368-2011 NR 5 TC 1 Z9 1 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1074 EP 1076 DI 10.1016/S0921-4526(97)00795-3 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600310 ER PT J AU Hamilton, WA Yethiraj, M AF Hamilton, WA Yethiraj, M TI Effects of travelling surface acoustic waves on neutron Bragg scattering from perfect crystals SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE surface acoustic wave; Doppler effects; coherent phonons AB We have studied the effects of a travelling surface acoustic wave (SAW) disturbance on symmetric Bragg case neutron diffraction from a perfect crystal of lithium niobate. Generally, the reflectivity is increased as the SAW distortion creates an effective moving mosaic crystal in the near surface region. Unlike the corresponding X-ray situation in which the crystalline distortion is effectively stationary, thermal neutron and SAW velocities are comparable, giving rise to significant Doppler effects that modify the reflected neutron intensity. No quantitative picture exists of the interaction between the neutron and the coherent surface phonons in the present situation. Several of our observations contradict even the qualitative expectations of a moving mosaic crystal analogy. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Hamilton, WA (reprint author), Oak Ridge Natl Lab, Div Solid State, POB 2008, Oak Ridge, TN 37831 USA. NR 10 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1080 EP 1082 DI 10.1016/S0921-4526(97)00797-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600312 ER PT J AU Bordallo, HN Barthes, M Eckert, J AF Bordallo, HN Barthes, M Eckert, J TI Vibrational dynamics of crystalline L-alanine SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE L-alanine; vibrational spectroscopy; normal-coordinate analysis ID TEMPERATURE-DEPENDENCE; RAMAN-SPECTRA AB We report here a new, complete vibrational analysis of L-alanine and L-alanine-d(4) which utilizes inelastic neutron scattering intensities (INS) in addition to frequency information, and present a self-consistent force field for the molecular vibrations in crystalline L-alanine based on a comparison of computed and observed INS spectra. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Montpellier 2, GDPC, F-34905 Montpellier, France. RP Bordallo, HN (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Bordallo, Heloisa/I-6836-2012 OI Bordallo, Heloisa/0000-0003-0750-0553 NR 12 TC 23 Z9 23 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1138 EP 1140 DI 10.1016/S0921-4526(97)00810-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600326 ER PT J AU Holden, TM Holt, RA Tome, CN AF Holden, TM Holt, RA Tome, CN TI Intergranular strains in Inconel-600 steam generator materials SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE intergranular strain; plasticity; Inconel-600 AB Engineering components are inhomogeneous on the scale of the grain size since the grains generally have different elastic and plastic properties depending on their crystallographic orientations. Constitutive equations describing the mechanical properties of materials in terms of the deformation state of the grains within it are needed to describe the behaviour of structures using the finite element method. Neutron diffraction provides a test of such constitutive models as the elasto-plastic self-consistent (EPSC) model, because the elastic strains in all grain orientations inside a sample can be measured independently. In this paper the intergranular strains measured in tensile test coupons after uniaxial plastic deformation of +5.6% and -6.0% are presented as strain pole-figures for the (1 1 1), (0 0 2), (2 2 0) and (1 1 3) reflections of the FCC structure. The results are compared with the predictions of the EPSC model, which has no adjustable parameters. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Steacie Inst Mol Sci, Neutron Mat Res, Chalk River, ON K0J 1J0, Canada. AECL Res, Chalk River, ON K0J 1J0, Canada. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Holden, TM (reprint author), Steacie Inst Mol Sci, Neutron Mat Res, Chalk River, ON K0J 1J0, Canada. NR 7 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1246 EP 1248 DI 10.1016/S0921-4526(97)00838-7 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600356 ER PT J AU Kawano, H Kajimoto, R Yoshizawa, H Fernandez-Baca, JA Tomioka, Y Kuwahara, H Tokura, Y AF Kawano, H Kajimoto, R Yoshizawa, H Fernandez-Baca, JA Tomioka, Y Kuwahara, H Tokura, Y TI Two-dimensional anisotropy in a layered metallic antiferromagnet RE1-xSrxMnO3 with x similar to 1/2 SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE metal-insulator transition; charge ordering; Mott insulator ID MAGNETIC-FIELD; PHASE-DIAGRAM; PR1-XCAXMNO3; PEROVSKITES; TRANSITION; X-LESS-THAN-OR-EQUAL-TO-0.17; LA1-XCAXMNO3; LA1-XSRXMNO3 AB Some RE1-xSrxMnO3 (RE = Nd, Pr) systems with x similar to 1/2 exhibit an A-type antiferromagnetic (AFM) structure instead of the expected CE-type magnetic structure. This can be understood as being a consequence of the increase of the bandwidth (W). These A-type magnetic systems also show salient features in their crystal structures. We propose a two-dimensional anisotropy of the transport as well as the magnetic properties for the A-type AFM I structure and we shaw that we have, indeed, observed anisotropic spin wave dispersion relations by inelastic neutron measurements. (C) 1998 Elsevier Science B.V. All rights reserved. C1 RIKEN, Inst Phys & Chem Res, Wako, Saitama 35101, Japan. Univ Tokyo, ISSP, Neutron Scattering Lab, Tokai, Ibaraki 31911, Japan. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. JRCAT, Tsukuba, Ibaraki 305, Japan. Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 113, Japan. RP RIKEN, Inst Phys & Chem Res, Hirosawa 2-1, Wako, Saitama 35101, Japan. EM hazuki@postman.riken.go.jp RI Tokura, Yoshinori/C-7352-2009; Fernandez-Baca, Jaime/C-3984-2014; Kawano-Furukawa, Hazuki/M-7646-2016; Kawano-Furukawa, Hazuki/M-7695-2016 OI Fernandez-Baca, Jaime/0000-0001-9080-5096; Kawano-Furukawa, Hazuki/0000-0003-4713-3727; Kawano-Furukawa, Hazuki/0000-0003-4713-3727 NR 24 TC 5 Z9 5 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 289 EP 294 DI 10.1016/S0921-4526(97)00569-3 PG 6 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600080 ER PT J AU McQueeney, RJ AF McQueeney, RJ TI A local dynamic correlation function from inelastic neutron scattering SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE inelastic neutron scattering; amorphous materials; local phenomena; phonons ID AMORPHOUS SOLIDS AB Information about local and dynamic atomic correlations can be obtained from inelastic neutron-scattering measurements by Fourier transform of the Q-dependent intensity oscillations at a particular frequency. A local dynamic structure function S(r, omega), is defined from the dynamic scattering function. S(Q, omega), such that the elastic and frequency-integrated limits correspond to the average and instantaneous pair-distribution Functions, respectively. As an example, S(r, omega) is calculated for polycrystalline aluminum in a model where atomic motions are entirely due to harmonic phonons. Published by Elsevier Science B.V. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, NS H805, Los Alamos, NM 87545 USA. EM mcqueeney@lanl.gov OI McQueeney, Robert/0000-0003-0718-5602 NR 9 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 412 EP 414 DI 10.1016/S0921-4526(97)00605-4 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600116 ER PT J AU Nipko, JC Loong, CK AF Nipko, JC Loong, CK TI Inelastic neutron scattering from zircon SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE phonon density of states; zircon; lattice dynamics ID ZRSIO4 AB A lattice-dynamical investigation of zircon (ZrSiO4) has been carried out to obtain a microscopic understanding of its thermodynamic properties, as well as to examine possible soft modes that may contribute to the phase transformation to scheelite-type under high pressure. We have measured the neutron weighted phonon density of states of zircon from a polycrystalline sample. The neutron spectra reveal one-phonon excitations extending to 1130 cm(-1), with phonon bands centered at 226, 298, 363, 540, 661, 726, 945 and 1081 cm(-1). A quantitative analysis of the neutron results was carried out using a lattice dynamical rigid-ion model. Published by Elsevier Science B.V. C1 Argonne Natl Lab, IPNS, Argonne, IL 60439 USA. RP Argonne Natl Lab, IPNS, Bldg 360, Argonne, IL 60439 USA. EM ckloong@anl.gov NR 4 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 415 EP 417 DI 10.1016/S0921-4526(97)00606-6 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600117 ER PT J AU Zheludev, A AF Zheludev, A TI Coexistence of Haldane-gap excitations and long-range order in R2BaNiO5 (R = rare earth) SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE 1-D antiferromagnetism; Haldane-gap excitations; spin ordering; quantum magnetic system; low-dimensional magnetism ID ONE-DIMENSIONAL ANTIFERROMAGNET; NEUTRON-SCATTERING; HEISENBERG CHAIN; SPIN DYNAMICS; MAGNETIC EXCITATIONS; SIGMA-MODEL; ND2BANIO5; Y2BANIO5; CSNICL3 AB R2BaNiO5 (R = rare earth) quasi-1-D antiferromagnets are structurally equivalent to the well-studied 1-D S = 1 Haldane-gap compound Y2BaNiO5. Unlike the Y-nickelate though, these materials undergo 3-D magnetic ordering at finite temperatures. Recent inelastic neutron-scattering studies of Pr2BaNiO5 and (NdxY1-x)(2)BaNiO5 revealed purely 1-D gap excitations that propagate exclusively on the Ni-chains and are strikingly similar to Haldane-gap modes in Y2BaNiO5. In the ordered phase, these excitations survive and actuary coexist with conventional spin waves. The results suggest that the Haldane-singlet ground state of the Ni-chains is not fully destroyed by Neel ordering. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 35 TC 3 Z9 3 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 495 EP 500 DI 10.1016/S0921-4526(97)00628-5 PG 6 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600143 ER PT J AU Johnson, CS Thackeray, MM Nipko, JC Loong, CK AF Johnson, CS Thackeray, MM Nipko, JC Loong, CK TI Spectroscopic study of the proton dynamics in manganese dioxide electrode materials SO PHYSICA B-CONDENSED MATTER LA English DT Article; Proceedings Paper CT International Conference on Neutron Scattering CY AUG 17-21, 1997 CL TORONTO, CANADA DE manganese dioxide; lithium battery; neutron scattering ID BATTERIES AB Proton or lithium diffusion is a critical electrode process that occurs in manganese dioxide electrode materials during cycling of either aqueous (alkaline) or non-aqueous (lithium) batteries. The structural and electrochemical properties of a number of hydrated alpha-phase manganese dioxide compounds (a-MnO2.nH(2)O; n approximate to 0.2-0.33), the heat-treated products (n approximate to 0-0.1), as well as their more stable lithia-doped derivatives, alpha-[xLi(2)O].MnO2 (0 < x less than or equal to 0.25), have been investigated. Inelastic neutron scattering was used as a means to differentiate and interrogate the key proton or water interactions in these MnO2 structures. The neutron spectra reveal excitations associated with the hydrogen vibrations centered at 4, 13, 16, 26, 36, 65, 90, 110, 140, 200, 420, and 490 meV in the alpha-phase and 14, 24, 65, 84, 100, 202, and 425 meV in the lithia-doped derivatives. Band assignments were carried out by comparing these frequencies with those reported for structurally similar hydrated gamma-MnO2, compounds and by comparison with infrared data. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, Argonne, IL 60439 USA. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RP Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, 9700 S Cass Ave, Argonne, IL 60439 USA. EM john-soncs@cmt.anl.gov NR 8 TC 0 Z9 0 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD DEC PY 1997 VL 241 BP 1252 EP 1254 DI 10.1016/S0921-4526(97)00846-6 PG 3 WC Physics, Condensed Matter SC Physics GA ZT224 UT WOS:000074062600358 ER PT J AU Tsuchiya, Y Hanaguri, T Maeda, A Steel, DG AF Tsuchiya, Y Hanaguri, T Maeda, A Steel, DG TI Josephson plasma resonance in the mixed state of heavy-ion irradiated Bi2Sr2CaCu2Oy SO PHYSICA C LA English DT Article; Proceedings Paper CT 1st RIEC International Symposium on Intrinsic Josephson Effects and THz Plasma Oscillations in High-Tc Superconductors CY FEB 23-25, 1997 CL TOHOKU UNIV, INST MAT RES, SENDAI, JAPAN SP Tohoku Univ, Res Inst Elect Commun, Japan Sci & Technol Corp, Japan Soc Appl Phys HO TOHOKU UNIV, INST MAT RES ID COUPLED SUPERCONDUCTORS; LAYERED SUPERCONDUCTORS; COLUMNAR DEFECTS; VORTEX STATE AB Magnetic-field dependence of microwave absorption was measured in heavy-ion irradiated Bi2Sr2CaCu2Oy. Two distinct peaks were observed. Both of them were considered to be due to Josephson plasma resonance (JPR). The dependence of the higher-field JPR on the defect concentration shows that even small number of vortices trapped at columnar defects improve the interlayer coherence of the vortices. On the other hand, the emergence of the lower-field peak only in irradiated samples suggests that the interplane critical-current density increases with increasing field at low-field region because of the competition between intervortex interaction and vortex wandering. (C) 1997 Elsevier Science B.V. C1 Univ Tokyo, Dept Basic Phys, Meguro Ku, Tokyo 153, Japan. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Tsuchiya, Y (reprint author), Univ Tokyo, Dept Basic Phys, Meguro Ku, 3-8-1 Komaba, Tokyo 153, Japan. RI Hanaguri, Tetsuo/I-6710-2012; Tsuchiya, Yoshishige/B-6127-2013 OI Hanaguri, Tetsuo/0000-0003-2896-0081; NR 12 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC PY 1997 VL 293 IS 1-4 BP 254 EP 258 DI 10.1016/S0921-4534(97)01551-7 PG 5 WC Physics, Applied SC Physics GA YQ843 UT WOS:000071429000049 ER PT J AU Dabrowski, B Rogacki, K Zheng, C Hinks, DG AF Dabrowski, B Rogacki, K Zheng, C Hinks, DG TI Single-crystal growth and characterization of Zn- and Ni-substituted YBa2Cu4O8 SO PHYSICA C LA English DT Article ID FE; CU; PHASES; CO AB Single crystals of Zn-and Ni-substituted YBa2Cu4O8 with T-c = 80-20 K for Zn and T-c = 80-0 K for Ni have been grown from a BaO-CuO flux at 1090 degrees C under 600 bar of O-2. Crystals grown in yttrium stabilized ZrO2 crucibles do not show contamination from the crucible material. The effective distribution coefficients for Zn and Ni are 0.3 and 1, respectively. The solubility limits are around 2% for Zn and above 6.5% for Ni. Single-crystal X-ray diffraction is used to characterize the crystal quality but it lacks the sensitivity to conclusively differentiate the site preference for small amounts of substituted ions. All crystals show sharp superconducting transitions with Delta T-c gradually increasing with decreasing T-c. (C) 1997 Elsevier Science B.V. C1 No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. No Illinois Univ, Dept Chem, De Kalb, IL 60115 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Dabrowski, B (reprint author), No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. NR 20 TC 5 Z9 5 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1997 VL 291 IS 3-4 BP 287 EP 296 DI 10.1016/S0921-4534(97)01668-7 PG 10 WC Physics, Applied SC Physics GA YN502 UT WOS:000071175000015 ER PT J AU Corti, M Nehrke, K Tabak, F Wani, BN Miller, LL AF Corti, M Nehrke, K Tabak, F Wani, BN Miller, LL TI F-19 NMR as a probe of flux-line motion in fluorinated YBa2Cu4O8 SO PHYSICA C LA English DT Article ID SPIN-LATTICE RELAXATION; Y-89 NMR; SUPERCONDUCTORS; ANISOTROPY; DYNAMICS; STATE AB The F-19 NMR linewidth and nuclear spin-lattice relaxation rate T-1(-1) has been measured in the temperature interval 4.2-300 K and at different external magnetic fields in an oriented powder of the superconductor YBa2Cu4O8:F (T-c = 81 K). It is observed that below T-c both the F-19 linewidth and T-1(-1) are affected by the thermal fluctuations of the flux lines demonstrating the possibility of using F-19 nuclei to probe the flux-line dynamics. An anomalous field dependence of both the linewidth and of T-1(-1) is also reported. (C) 1997 Elsevier Science B.V. C1 Dipartimento Fis A Volta, Unita INFM, I-27100 Pavia, Italy. Sez INFN, I-27100 Pavia, Italy. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Hacettepe Univ, Dept Engn Phys, TR-06532 Ankara, Turkey. Bhabha Atom Res Ctr, Div Appl Chem, Bombay 400085, Maharashtra, India. RP Corti, M (reprint author), Dipartimento Fis A Volta, Unita INFM, Via Bassi 6, I-27100 Pavia, Italy. NR 12 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1997 VL 291 IS 3-4 BP 297 EP 301 DI 10.1016/S0921-4534(97)01679-1 PG 5 WC Physics, Applied SC Physics GA YN502 UT WOS:000071175000016 ER PT J AU Kwok, WK Crabtree, GW Fendrich, JA Paulius, LM AF Kwok, WK Crabtree, GW Fendrich, JA Paulius, LM TI Dynamic instabilities in the vortex lattice of YBa2Cu3O7-delta SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 1st RIEC International Symposium on Intrinsic Josephson Effects and THz Plasma Oscillations in High-Tc Superconductors CY FEB 23-25, 1997 CL TOHOKU UNIV, INST MAT RES, SENDAI, JAPAN SP Tohoku Univ, Res Inst Elect Commun, Japan Sci & Technol Corp, Japan Soc Appl Phys HO TOHOKU UNIV, INST MAT RES ID MELTING TRANSITION; SINGLE-CRYSTALS; UNTWINNED YBA2CU3O7-DELTA AB A dynamic instability in the AC response of the vortex solid phase just below the melting/freezing line is reported. The instability takes the form of a voltage oscillation whose frequency is much lower than the driving frequency. The dependence of the voltage oscillation on experimental parameters is described. (C) 1997 Elsevier Science B.V. C1 Argonne Natl Lab, Mat Sci & Sci & Technol Ctr Superconduct, Argonne, IL 60435 USA. RP Crabtree, GW (reprint author), Argonne Natl Lab, Mat Sci & Sci & Technol Ctr Superconduct, Argonne, IL 60435 USA. EM crabtree@anl.gov NR 18 TC 24 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD DEC PY 1997 VL 293 IS 1-4 BP 111 EP 117 DI 10.1016/S0921-4534(97)01525-6 PG 7 WC Physics, Applied SC Physics GA YQ843 UT WOS:000071429000023 ER PT J AU Melik-Alaverdian, V Bonesteel, NE Ortiz, G AF Melik-Alaverdian, V Bonesteel, NE Ortiz, G TI Fixed-phase diffusion Monte Carlo study of the quantum-Hall effect on the Haldane sphere SO PHYSICA E LA English DT Article; Proceedings Paper CT Workshop on Novel Physics in Low-Dimensional Electron Systems (LOWDES) CY JUL 28-AUG 08, 1997 CL MAX PLANCK INST PHYSIK KOMPLEXER SYST, DRESDEN, GERMANY HO MAX PLANCK INST PHYSIK KOMPLEXER SYST DE quantum Hall effect; Haldane sphere ID MAGNETIC-FIELD; ELECTRON-GAS; ENERGIES; EXCITATIONS; STATES; LIQUID AB A generalized diffusion Monte Carlo method for solving the many-body Schrodinger equation on curved manifolds is introduced and used to perform a 'fixed-phase' simulation of the integer and fractional quantum-Hall effect on the Haldane sphere. The effect of Landau level mixing on the v = 1 and v = 1/3 energy gaps and the relative stability of spin-polarized and spin-reversed quasielectron excitations are studied using the new method. Published by Elsevier Science B.V. C1 Florida State Univ, Dept Phys, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Melik-Alaverdian, V (reprint author), Florida State Univ, Dept Phys, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA. NR 23 TC 3 Z9 3 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD DEC PY 1997 VL 1 IS 1-4 BP 138 EP 144 DI 10.1016/S1386-9477(97)00032-5 PG 7 WC Nanoscience & Nanotechnology; Physics, Condensed Matter SC Science & Technology - Other Topics; Physics GA ZW010 UT WOS:000074364500032 ER PT J AU Harff, NE Simmons, JA Lyo, SK Klem, JF Boebinger, GS Pfeiffer, LN West, KW AF Harff, NE Simmons, JA Lyo, SK Klem, JF Boebinger, GS Pfeiffer, LN West, KW TI Landau level formation and magnetic breakdown in coupled double quantum wells SO PHYSICA E LA English DT Article; Proceedings Paper CT Workshop on Novel Physics in Low-Dimensional Electron Systems (LOWDES) CY JUL 28-AUG 08, 1997 CL MAX PLANCK INST PHYSIK KOMPLEXER SYST, DRESDEN, GERMANY HO MAX PLANCK INST PHYSIK KOMPLEXER SYST DE quantum wells; electrical transport measurements; magnetic phenomena ID FIELDS; MASS AB We investigate Landau level formation in closely coupled double quantum wells by measuring the longitudinal resistance (R-xx) as a function of both perpendicular (B-perpendicular to) and in-plane (B-parallel to) magnetic fields. B-parallel to distorts the dispersion curve resulting in a continuously tunable, non-parabolic, two-component system. B-perpendicular to causes Landau level formation in each branch of the dispersion. These two ladders of Landau levels have multiple crossings because the cyclotron masses and Fermi energies of the two components change in opposite directions with B-parallel to. Due to magnetic breakdown of the Fermi surface, a third set of Landau levels, independent of B-parallel to, occurs at slightly higher B-perpendicular to (approximate to 1 T). (C) 1997 Elsevier Science B.V. All rights reserved. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. RP Harff, NE (reprint author), Max Planck Inst Festkorperforsch, Postfach 80 06 65, D-70506 Stuttgart, Germany. EM harff@klizix.mpi-stuttgart.mpg.de NR 8 TC 0 Z9 0 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD DEC PY 1997 VL 1 IS 1-4 BP 185 EP 187 DI 10.1016/S1386-9477(97)00040-4 PG 3 WC Nanoscience & Nanotechnology; Physics, Condensed Matter SC Science & Technology - Other Topics; Physics GA ZW010 UT WOS:000074364500040 ER PT J AU Dilmanian, FA Wu, XY Parsons, EC Ren, B Button, TM Chapman, LD Huang, X Marcovici, S Menk, R Nickoloff, EL Petersen, MJ Roque, CT Thomlinson, WC Zhong, Z AF Dilmanian, FA Wu, XY Parsons, EC Ren, B Button, TM Chapman, LD Huang, X Marcovici, S Menk, R Nickoloff, EL Petersen, MJ Roque, CT Thomlinson, WC Zhong, Z TI The tomography beamline at the National Synchrotron Light Source SO PHYSICA MEDICA LA English DT Article; Proceedings Paper CT V International Conference on Application of Physics in Medicine and Biology (Trieste Medical Physics 96) / IX Congresso AIFB / EFOMP Medical Physics 96 / EUTECH 96 CY SEP 02-06, 1996 CL TRIESTE, ITALY SP Int Ctr Theoret Phys, Ist Nazl Fis Nucl, Univ Studi Trieste, Assoc Italiana Fis Biomed, European Federat Org Med Phys, CNR, Regione Autonoma Friuli Venezia Giulia, Comune Trieste, Provincia Trieste ID COMPUTED-TOMOGRAPHY; SMALL SAMPLES; RADIATION AB We compared the image contrast of a monochromatic CT, Multiple Energy Computed Tomography (MECT), being developed at the National Synchrotron Light Source for imaging the human head and neck, and a conventional CT scanner using phantoms. The same phantom images were also produced by computer simulations. The experimental results indicate that monochromatic CT, with a beam energy tuned just above the iodine K-edge, has approximate to 3-fold advantage in iodine image contrast over conventional CT with a 120 kVp beam. Modeling the same polychromatic beam and a monochromatic beam of the same mean energy at the same 3-rad dose and 3-mm slice height on an 18-cm-diameter acrylic phantom, the simulations show a noise of 1.4 HU for MECT and 1.9 HU for CCT. Furthermore, despite the Cupping-effect corrections the bone contrast is lower in CCT and varies by 16 HU moving from the phantom's center to the edge; this indicates an advantage for MECT in detecting and quantifying lesions differing from surrounding tissue by their effective mean atomic number. C1 SUNY Stony Brook, Sch Med, Dept Radiol, Stony Brook, NY 11794 USA. Anal Corp, Peabody, MA 01960 USA. IIT, Ctr Synchrotron Res & Instrumentat, Chicago, IL 60616 USA. Columbia Univ, Sch Med, Dept Radiol, New York, NY 10032 USA. SUNY Stony Brook, Sch Med, Dept Surg, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. RI Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 17 TC 3 Z9 3 U1 0 U2 1 PU GIARDINI EDITORI S A LUGANO PI LUGANO PA PIAZZA MONTE CENERI 13,, CH6901 LUGANO, SWITZERLAND SN 1120-1797 J9 PHYS MEDICA JI Phys. Medica PD DEC PY 1997 VL 13 SU 1 BP 13 EP 18 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA ZT180 UT WOS:000074057200004 ER PT J AU Thomlinson, W AF Thomlinson, W TI Current status and perspectives of synchrotron radiation in medicine SO PHYSICA MEDICA LA English DT Article; Proceedings Paper CT V International Conference on Application of Physics in Medicine and Biology (Trieste Medical Physics 96) / IX Congresso AIFB / EFOMP Medical Physics 96 / EUTECH 96 CY SEP 02-06, 1996 CL TRIESTE, ITALY SP Int Ctr Theoret Phys, Ist Nazl Fis Nucl, Univ Studi Trieste, Assoc Italiana Fis Biomed, European Federat Org Med Phys, CNR, Regione Autonoma Friuli Venezia Giulia, Comune Trieste, Provincia Trieste DE synchrotron; medical applications; angiography; mammography ID CORONARY ANGIOGRAPHY; X-RAY; MAMMOGRAPHY AB Over the past two decades there has been a phenomenal growth in the number of dedicated synchrotron radiation facilities and a corresponding growth in the number of applications in both basic and applied sciences. The high flux and brightness, tunable beams, time structure and polarization of synchrotron radiation provide an ideal x-ray source for many applications in the medical sciences. There is a dual aspect to the field of medical applications of synchrotron radiation. First there are the important in-vitro programs such as structural biology, x-ray microscopy, and radiation cell biology. Second there are the programs that are ultimately targeted at in-vivo applications. The present status of synchrotron coronary angiography, multiple energy computed tomography, mammography and radiation therapy programs at laboratories around the world is reviewed and some future projections for these applications are made. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. NR 24 TC 12 Z9 12 U1 0 U2 0 PU GIARDINI EDITORI S A LUGANO PI LUGANO PA PIAZZA MONTE CENERI 13,, CH6901 LUGANO, SWITZERLAND SN 1120-1797 J9 PHYS MEDICA JI Phys. Medica PD DEC PY 1997 VL 13 SU 1 BP 19 EP 23 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA ZT180 UT WOS:000074057200005 ER PT J AU Menk, RH Charvet, AM Arfelli, F Chapman, L Thomlinson, W Zhong, Z AF Menk, RH Charvet, AM Arfelli, F Chapman, L Thomlinson, W Zhong, Z TI Three energy computed tomography with synchrotron radiation SO PHYSICA MEDICA LA English DT Article; Proceedings Paper CT V International Conference on Application of Physics in Medicine and Biology (Trieste Medical Physics 96) / IX Congresso AIFB / EFOMP Medical Physics 96 / EUTECH 96 CY SEP 02-06, 1996 CL TRIESTE, ITALY SP Int Ctr Theoret Phys, Ist Nazl Fis Nucl, Univ Studi Trieste, Assoc Italiana Fis Biomed, European Federat Org Med Phys, CNR, Regione Autonoma Friuli Venezia Giulia, Comune Trieste, Provincia Trieste ID CORONARY ANGIOGRAPHY AB Preliminary experiments for digital subtraction computed tomography (CT) at the K-edge of iodine (33.17 keV) were carried out at SMERF (Synchrotron Medical Research Facility X17B2) at the National Synchrotron Light Source, Brookhaven National Laboratory. The major goal was to evaluate the availability of this kind of imaging for in vivo neurological studies. Using the transvenous coronary angiography system, CT images of various samples and phantoms were taken simultaneously at two slightly different energies bracketing the K - absorption edge of iodine, The logarithmic subtraction of the two images resulted in the contrast enhancement of iodine filled structures. An additional CT image was taken at 99.57 keV (second harmonic of the fundamental wave). The third energy allowed the calculation of absolute iodine, tissue and bone images by means of a matrix inversion. A spatial resolution of 0.8 LP/mm was measured in single energy images and iodine concentrations down to 0.082 mg/ml in a 1/4 " diameter detail were visible in the reconstructed subtraction image. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11573 USA. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Universite Joseph Fourier, F-38043 Grenoble, France. European Synchrotron Radiat Facil, F-38043 Grenoble 9, France. IIT, CSRRI, Chicago, IL 60616 USA. RI Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 8 TC 3 Z9 3 U1 0 U2 0 PU GIARDINI EDITORI S A LUGANO PI LUGANO PA PIAZZA MONTE CENERI 13,, CH6901 LUGANO, SWITZERLAND SN 1120-1797 J9 PHYS MEDICA JI Phys. Medica PD DEC PY 1997 VL 13 SU 1 BP 26 EP 29 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA ZT180 UT WOS:000074057200007 ER PT J AU Zegenhagen, J Lyman, PF Bohringer, M Bedzyk, MJ AF Zegenhagen, J Lyman, PF Bohringer, M Bedzyk, MJ TI Discommensurate reconstructions of (111)Si and Ge induced by surface alloying with Cu, Ga and In SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Review ID SCANNING-TUNNELING-MICROSCOPY; X-RAY-DIFFRACTION; ENERGY-ELECTRON-DIFFRACTION; SILICON SURFACE; STANDING WAVES; GE(111); SI(111); PHASE; GALLIUM; GROWTH C1 Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany. Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. Northwestern Univ, Mat Res Ctr, Evanston, IL 60208 USA. Univ Lausanne, Inst Phys Expt, CH-1015 Lausanne, Switzerland. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Zegenhagen, J (reprint author), Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany. RI Bedzyk, Michael/B-7503-2009; Bedzyk, Michael/K-6903-2013 NR 58 TC 21 Z9 21 U1 1 U2 5 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD DEC PY 1997 VL 204 IS 2 BP 587 EP 616 DI 10.1002/1521-3951(199712)204:2<587::AID-PSSB587>3.0.CO;2-Y PG 30 WC Physics, Condensed Matter SC Physics GA YP824 UT WOS:000071318800002 ER PT J AU Friar, JL Martorell, J Sprung, DWL AF Friar, JL Martorell, J Sprung, DWL TI Nuclear sizes and the isotope shift SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-DEUTERON SCATTERING; ELECTROMAGNETIC FORM-FACTORS; RELATIVISTIC CORRECTIONS; 3-NUCLEON FORCES; ATOMIC MASS; LAMB SHIFT; RMS-RADIUS; ENERGY; HE-3; SPECTROSCOPY AB Darwin-Foldy nuclear-size corrections in electronic atoms and nuclear radii are discussed from the nuclear-physics perspective. The interpretation of precise isotope-shift measurements is formalism dependent, and care must be exercised in interpreting these results and those obtained from relativistic electron scattering from nuclei. We strongly advocate that the entire nuclear-charge operator be used in calculating nuclear-size corrections in atoms rather than relegating portions of it to the nonradiative recoil corrections. A preliminary examination of the intrinsic deuteron radius obtained from isotope-shift measurements suggests the presence of small meson-exchange currents (exotic binding contributions of relativistic order) in the nuclear charge operator, which contribute approximately 1/2%. [S1050-2947(97)04312-6]. C1 UNIV BARCELONA,FAC FIS,DEPT ESTRUCTURA & CONSTITUENTS MAT,E-08028 BARCELONA,SPAIN. MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON,ON L8S 4M1,CANADA. RP Friar, JL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 63 TC 83 Z9 84 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 DEC PY 1997 VL 56 IS 6 BP 4579 EP 4586 DI 10.1103/PhysRevA.56.4579 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300034 ER PT J AU Fournier, KB Cohen, M Goldstein, WH AF Fournier, KB Cohen, M Goldstein, WH TI Dielectronic recombination rates in H-like Ar17+ to Ne-like Ar8+ SO PHYSICAL REVIEW A LA English DT Article ID X-RAY LASER; RATE COEFFICIENTS; ISOELECTRONIC SEQUENCE; COMPLEX SPECTRA; IONS; AUTOIONIZATION; IONIZATION; PLASMAS; PROGRAM; IRON AB This paper presents systematic calculations of the dielectronic recombination (DR) rate coefficient for all energy levels in the ground configuration of each L-shell argon ion, Li-like Ar15+ to Ne-like Ar8+. The DR rate coefficients from H-like Ar17+ and He-like Ar16+ an also calculated. The rate coefficients are calculated ab initio using the fully relativistic, parametric potential atomic structure code RELAC. Autoionization rates are computed in the distorted wave approximation using RELAC's wave functions. Configuration interaction (CI) in the levels of the initial and recombined ion is taken into account; CI strongly affects the energies of levels close to the continuum and strongly enhances the rates of weak autoionizing transitions. The contributions to recombination from the promotion of an n = 1 (K shell) or an n = 2 (L shell) electron are calculated. Capture of a free electron into levels with principal quantum numbers as high as n = 14 is allowed, and is extended to n = 18 in the case of Li-and Be-like ions. The contribution to recombination through high angular momentum orbitals (l less than or equal to 6) is included in the calculations. [S1050-2947(97)03612-3]. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. NR 29 TC 9 Z9 9 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 DEC PY 1997 VL 56 IS 6 BP 4715 EP 4732 DI 10.1103/PhysRevA.56.4715 PG 18 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300048 ER PT J AU Lamoreaux, SK AF Lamoreaux, SK TI Thermalization of trapped ions: A quantum perturbation approach SO PHYSICAL REVIEW A LA English DT Article AB The rate at which external random thermal fluctuations drive transitions between, and cause decoherence of, the near ground vibrational (harmonic oscillator) quantum states of trapped cold ions is of crucial importance in relation to quantum computing. Presented here is an estimate of these rates, for a single trapped ion, based on a quantum perturbation approach where an external thermal energy reservoir is electrically coupled to the ion. The results are for a general system, and it is shown that the relevant parameter in the interpretation of experimentally observed heating rates is the correlation time of the fluctuations. The rates due to the fluctuating electric field associated with blackbody radiation are also considered and shown to be negligible. [S1050-2947(97)10311-0]. RP Lamoreaux, SK (reprint author), LOS ALAMOS NATL LAB,PHYS DIV 23,MS H803,POB 1663,LOS ALAMOS,NM 87545, USA. NR 8 TC 42 Z9 43 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1997 VL 56 IS 6 BP 4970 EP 4975 DI 10.1103/PhysRevA.56.4970 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300077 ER PT J AU Friar, JL Payne, GL AF Friar, JL Payne, GL TI Higher-order nuclear-size corrections in atomic hydrogen SO PHYSICAL REVIEW A LA English DT Article ID POTENTIALS AB Nuclear-size corrections-of order (Z alpha)(5) and (Z alpha)(6) to the S-state levels of hydrogenic atoms are considered. These nuclear-elastic contributions are somewhat smaller than the polarizability (nuclear-inelastic) corrections for deuterium, but are of comparable or larger size for the hydrogen case. For deuterium the (attractive) nonrelativistic (Z alpha)(5) correction to the 2S-1S transition is 0.49 kHz, while the (repulsive) relativistic (Z alpha)(6) contribution is -3.40 kHz. For the proton the corresponding corrections are 0.03 kHz and -0.61 kHz, respectively. The (Z alpha)(5) contribution largely cancels the Coulomb-retardation part of the nuclear-polarization correction. [S1050-2947(97)06212-4]. C1 UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP Friar, JL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 26 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1997 VL 56 IS 6 BP 5173 EP 5175 DI 10.1103/PhysRevA.56.5173 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300098 ER PT J AU McCurdy, CW Rescigno, TN AF McCurdy, CW Rescigno, TN TI Calculating differential cross sections for electron-impact ionization without explicit use of the asymptotic form SO PHYSICAL REVIEW A LA English DT Article ID SCATTERING; HYDROGEN; MODEL AB We describe the calculation of singly differential (energy-sharing) cross sections for electron-impact ionization. First, using exterior complex scaling, we calculate the outgoing portion of the scattering wave function without explicit use of asymptotic boundary conditions. Once that wave function is known for a finite region of space, the outgoing flux can be calculated and extrapolated to large distances according to behavior that is specific to the ionization problem. The differential cross section is proportional to the outgoing flux in specific directions of a hyperspherical angle in the coordinates. Calculations on the singlet s-wave radial limit (Temkin-Poet and collinear) models of electron-hydrogen atom ionization are presented. [S1050-2947(97)50812-2]. C1 LAWRENCE LIVERMORE NATL LAB,PHYS & SPACE TECHNOL DIRECTORATE,LIVERMORE,CA 94550. RP McCurdy, CW (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 14 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1997 VL 56 IS 6 BP R4369 EP R4372 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300005 ER PT J AU Xu, J Hulett, LD Moxom, J Wu, W Datz, S Schrader, DM AF Xu, J Hulett, LD Moxom, J Wu, W Datz, S Schrader, DM TI Formation of HeH+ from positron interactions with H-2 and He mixtures SO PHYSICAL REVIEW A LA English DT Article ID IONIZATION; ENERGY AB We have observed the production of HeH+ ions by the bombardment of gaseous mixtures of H-2 and He with slow positrons and measured its dependence on the positron energy. The formation is believed to involve vibrational excitation of H-2(+) via positronium formation, followed by proton transfer from H-2(+) to He. The significance of these results with respect to astrophysics is discussed. [S1050-2947(97)51012-2]. C1 UNIV WISCONSIN,DEPT CHEM,MILWAUKEE,WI 53201. RP Xu, J (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC PY 1997 VL 56 IS 6 BP R4373 EP R4376 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK233 UT WOS:A1997YK23300006 ER PT J AU Donnelly, SE Birtcher, RC AF Donnelly, SE Birtcher, RC TI Heavy ion cratering of gold SO PHYSICAL REVIEW B LA English DT Article ID COMPUTER-SIMULATIONS; MOLECULAR-DYNAMICS; IRRADIATION AB Irradiation of gold films with Xe ions in the energy range 50-400 keV has been monitored using in situ transmission electron microscopy. Craters are produced and annihilated on the irradiated surface at all ion energies studied. Approximately 2-5% of impinging ions in the energy range 50-400 keV produce craters with sizes as large as 12 nm for the higher-energy irradiations. Crater annihilation occurs in discrete steps, due to subsequent ion impacts, or by annealing in a continuous manner due to surface diffusion processes. Crater creation results from flow associated with near surface cascades. Discrete crater annihilation results from plastic Bow induced by ion impacts, including those that do not themselves leave a crater, and annealing that may occur during the quenching phase of cascade thermal spikes. RP Donnelly, SE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. OI Donnelly, Stephen/0000-0002-9749-5550 NR 15 TC 42 Z9 42 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 21 BP 13599 EP 13602 DI 10.1103/PhysRevB.56.13599 PG 4 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900002 ER PT J AU Morosin, B Assink, RA Dunn, RG Massis, TM Schirber, JE Kwei, GH AF Morosin, B Assink, RA Dunn, RG Massis, TM Schirber, JE Kwei, GH TI Methane-intercalated C-60: Preparation, orientational ordering, and structure SO PHYSICAL REVIEW B LA English DT Article ID HIGH-PRESSURE; SOLID C60; DYNAMICS; NE AB The orientational ordering temperature for methane-intercalated C-60 is greatly depressed from similar to 260 K in pure C-60 to similar to 241 and similar to 235 K in the stable compounds C-60-CH4 and C-60-CD4, respectively. C-13 NMR shows that the C-60 molecules have ordered near 200 K while H-2 NMR shows that the CD4 continues to be completely unoriented and freely rotating. The Rietveld refinement of the structures of C-60-CD4 at 15, 200, and 296 K using time-of-flight neutron powder data as well as least squares refinement of Mo-K-alpha x-ray data on C-60-CH4 single crystals are consistent with such rotational disorder. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Morosin, B (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 21 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 DEC 1 PY 1997 VL 56 IS 21 BP 13611 EP 13614 DI 10.1103/PhysRevB.56.13611 PG 4 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900005 ER PT J AU Meldrum, A Boatner, LA Ewing, RC AF Meldrum, A Boatner, LA Ewing, RC TI Displacive radiation effects in the monazite- and zircon-structure orthophosphates SO PHYSICAL REVIEW B LA English DT Article ID IRRADIATION-INDUCED AMORPHIZATION; BEAM-INDUCED AMORPHIZATION; RARE-EARTH ELEMENTS; CERAMIC INSULATORS; GAAS NANOCRYSTALS; ION; URANIUM; THORIUM; DAMAGE AB Monazite-structure orthophosphates, including LaPO4, PrpO(4), NdPO4, SmPO4, EuPo4, GdPO4, and natural monazite, and their zircon-structure analogs, including ScPO4, YPO4, TbPO4, TmPO4, YbPO4, and LuPO4, were irradiated by 800 keV Kr2+ ions in the temperature range of 20 to 600 K. The critical amorphization dose was determined in situ as a function of temperature using selected-area electron diffraction. Amorphization doses were in the range of 10(14) to 10(16) ions/cm(2), depending on the temperature. Materials with the zircon structure were amorphized at higher temperatures than those with the monazite structure. The critical amorphization temperature ranged from 350 to 485 K for orthophosphates with the monazite structure. The critical amorphization temperature ranged from 350 to 485 K for orthophosphates with the monazite structure and from 480 to 580 K for those with the zircon structure. However, natural zircon (ZrSiO4) can be amorphized at over 1000 K. Within each structure type, the critical temperature of amorphization increased with the atomic number of the lanthanide cation. Structural topology models are consistent with the observed differences between the two structure types, but not predict the relative amorphization doses for different compositions. The ratio of electronic-to-nuclear stopping correlates well with the observed of susceptibility to amorphization within each structure type, consistent with previous results that electronic-energy losses enhance defect recombination in the orthophosphates. C1 UNIV NEW MEXICO, DEPT EARTH & PLANETARY SCI, ALBUQUERQUE, NM 87131 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. OI Boatner, Lynn/0000-0002-0235-7594 NR 54 TC 127 Z9 128 U1 3 U2 47 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 DEC 1 PY 1997 VL 56 IS 21 BP 13805 EP 13814 DI 10.1103/PhysRevB.56.13805 PG 10 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900048 ER PT J AU Bellaiche, L Wei, SH Zunger, A AF Bellaiche, L Wei, SH Zunger, A TI Bond-length distribution in tetrahedral versus octahedral semiconductor alloys: The case of Ga1-xInxN SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION FINE-STRUCTURE; RANDOM SOLID-SOLUTIONS; DISORDERED MIXED SALTS; ATOMIC-SCALE STRUCTURE; LOCAL-STRUCTURE; TERNARY ALLOYS AB Large (approximate to 1000 atoms) supercell valence force-field simulations are used to investigate the nearest-neighbor bond-length distribution in relaxed tetrahedral (zinc blende and wurtzite) and octahedral (rocksalt) Ga1-xInxN alloys. We find that, due to the rigidity of the octahedron, the distribution of each anion-cation bond length in rocksalt alloys has two contributions: unrelaxed bonds and relaxed bonds. These two peaks have a large width and overlap slightly, leading to a broad nearest-neighbor distance distribution. On the other hand, the anion-cation nearest-neighbor distribution in zinc-blende alloys can be decomposed into a sum over four closely spaced and sharp peaks associated with different clusters, leading to a narrow, single-peaked nearest-neighbor distribution. Finally the wurtzite alloys exhibit bond-length distributions that are very similar to the corresponding ones in the zinc-blende alloys, leading to a nearly identical strain energy in random zinc-blende and wurtzite alloys. RP Bellaiche, L (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 29 TC 20 Z9 20 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 DEC 1 PY 1997 VL 56 IS 21 BP 13872 EP 13877 DI 10.1103/PhysRevB.56.13872 PG 6 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900057 ER PT J AU Zheludev, A Maslov, S Shirane, G Sasago, Y Koide, N Uchinokura, K Tennant, DA Nagler, SE AF Zheludev, A Maslov, S Shirane, G Sasago, Y Koide, N Uchinokura, K Tennant, DA Nagler, SE TI Square-lattice spiral magnet Ba2CuGe2O7 in an in-plane magnetic field SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-SCATTERING; PHASE-DIAGRAM; MNSI; CSCUCL3 AB The magnetic structure of Ba2CuGe2O7 is investigated by neutron diffraction in magnetic fields applied along several directions in the (a,b) plane of the crystal. In relatively weak fields, H less than or similar to 0.5 T, the propagation vector of the spin spiral rotates to form a finite angle with the field direction. This angle depends on the orientation of H itself. The rotation of the propagation vector is accompanied by a reorientation of the plane of spin rotation in the spiral. The observed behavior is well described by a continuous-limit form of a free-energy functional that includes exchange and Dzyaloshinskii-Moriya interactions, as well as the Zeeman energy and an empirical anisotropy term. C1 UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Zheludev, A (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010; Maslov, Sergei/C-2397-2009; Tennant, David/Q-2497-2015 OI Nagler, Stephen/0000-0002-7234-2339; Maslov, Sergei/0000-0002-3701-492X; Tennant, David/0000-0002-9575-3368 NR 19 TC 21 Z9 21 U1 0 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 21 BP 14006 EP 14012 DI 10.1103/PhysRevB.56.14006 PG 7 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900072 ER PT J AU Sadewasser, S Wang, Y Schilling, JS Zheng, H Paulikas, AP Veal, BW AF Sadewasser, S Wang, Y Schilling, JS Zheng, H Paulikas, AP Veal, BW TI Pressure-dependent oxygen ordering in strongly underdoped YBa2Cu3O7-y SO PHYSICAL REVIEW B LA English DT Article ID TEMPERATURE; SUPERCONDUCTIVITY; STATE AB Previous studies on the high-T-c superconductor Tl2Ba2CuO6+delta have given evidence for distinct low-and high-temperature oxygen ordering processes activated for temperatures above 13 and 200 K, respectively. In contrast, the present experiments on strongly underdoped YBa2Cu3O6.41 with T-c(0)similar or equal to 13 K reveal only high-temperature relaxation processes with a relaxation time tau at 298 K which increases under pressure from approximately 10 h at 1 bar to 50 h at 0.79 GPa to 550 h at 2.3 Gpa. From these results the activation volume is estimated to be 4.2 cm(3)/mol, a value equal to three-quarters of the molar volume of the O2- ion. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP Sadewasser, S (reprint author), WASHINGTON UNIV, DEPT PHYS, CB 1105, 1 BROOKINGS DR, ST LOUIS, MO 63130 USA. RI Sadewasser, Sascha/E-6229-2012; OI Sadewasser, Sascha/0000-0001-8384-6025 NR 26 TC 27 Z9 27 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 21 BP 14168 EP 14175 DI 10.1103/PhysRevB.56.14168 PG 8 WC Physics, Condensed Matter SC Physics GA YJ879 UT WOS:A1997YJ87900094 ER PT J AU Goodrich, RG Adams, PW Lowndes, DH Norton, DP AF Goodrich, RG Adams, PW Lowndes, DH Norton, DP TI Origin of the variation of T-c with superconducting layer thickness and separation in YBa2Cu3O7-x/PrBa2Cu3O7 superlattices SO PHYSICAL REVIEW B LA English DT Article ID FILMS; TRANSITION; SUPPRESSION; MULTILAYERS; ULTRATHIN; STATES AB We have investigated the superconducting (SC) properties of ultra-thin YBa2Cu3O7-x layers in YBa2Cu3O7-x/PrBa2Cu3O7 superlattices in which the coupling between adjacent YBa2Cu3O7-x layers is modulated by varying thicknesses of insulating PrBa2Cu3O7. In particular, we have formulated a phenomenological model that accounts for the dependence of the YBa2Cu3O7-x transition temperature on both the thickness of and the separation between YBa2Cu3O7-x layers. The results of our analysis are compared with previous studies of conventional low-T-c thin film systems. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP Goodrich, RG (reprint author), LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803, USA. NR 22 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 22 BP 14299 EP 14302 PG 4 WC Physics, Condensed Matter SC Physics GA YL011 UT WOS:A1997YL01100018 ER PT J AU Matsuda, M Katsumata, K Osafune, T Motoyama, N Eisaki, H Uchida, S Yokoo, T Shapiro, SM Shirane, G Zarestky, JL AF Matsuda, M Katsumata, K Osafune, T Motoyama, N Eisaki, H Uchida, S Yokoo, T Shapiro, SM Shirane, G Zarestky, JL TI Magnetic excitations and structural change in the S=1/2 quasi-one-dimensional magnet SO PHYSICAL REVIEW B LA English DT Article ID SPIN GAP; SUPERCONDUCTIVITY; LADDERS; CHAINS; STATE AB Neutron-scattering measurements have been performed on the S=1/2 quasi-one-dimensional system Sr14-xYxCu24O41, which has both simple chains and two-leg ladders of copper ions. We observed that when a small amount of yttrium is substituted for strontium, which is expected to reduce the number of holes, the dimerized state and the structure in the chain are changed drastically. The inelastic peaks originating from the dimerized state of the chain become broader in energy but not in momentum space. This implies that the dimerized state becomes unstable but the spin correlations are unchanged with yttrium substitution. Furthermore. it was observed that nuclear-Bragg-peak intensities originating from the chain show strong temperature and x dependence, which suggests that the chains slide along the c axis as temperature and x are varied. C1 UNIV TOKYO,DEPT SUPERCONDUCT,BUNKYO KU,TOKYO 113,JAPAN. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. AOYAMA GAKUIN UNIV,DEPT PHYS,SETAGAYA KU,TOKYO 157,JAPAN. RP Matsuda, M (reprint author), RIKEN,INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 17 TC 33 Z9 33 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 22 BP 14499 EP 14504 DI 10.1103/PhysRevB.56.14499 PG 6 WC Physics, Condensed Matter SC Physics GA YL011 UT WOS:A1997YL01100044 ER PT J AU Butler, WH Zhang, XG Schulthess, TC Nicholson, DMC MacLaren, JM Speriosu, VS Gurney, BA AF Butler, WH Zhang, XG Schulthess, TC Nicholson, DMC MacLaren, JM Speriosu, VS Gurney, BA TI Conductance and giant magnetoconductance of Co vertical bar Cu vertical bar Co spin valves: Experiment and theory SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC MULTILAYERED STRUCTURES; FIRST-PRINCIPLES CALCULATIONS; ELECTRICAL-CONDUCTIVITY; NEGATIVE MAGNETORESISTANCE; METALLIC MULTILAYERS; INTERFACE; TRANSPORT; SCATTERING; CURRENTS; ALLOYS AB We present measurements of the conductance and magnetoconductance,cl as a function of cobalt layer thickness for cobalt-copper-cobalt spin valves deposited by magnetron sputtering,a. We compare these measurements to calculations of the conductance and magnetoconductance , which are based on first-principles calculations of the self-consistent electronic structure of the cobalt-copper-cobalt system. The calculations are performed using a generalized Kubo formula for the: nonlocal layer dependent conductivity, which is implemented within the layer Korringa-Kohn-Rostoker method for electronic-structure calculations. The scattering rates within each layer are adjusted phenomenologically to be consistent with the experimentally observed resistivity of thick films of cobalt and copper. The magnetoconductance and its dependence on the thickness of the cobalt layer are consistent with calculations that include strong but spin-dependent scatter inp within the cobalt layers and possibly some channeling of electrons in the copper layer. We find that the transmission and reflection of electrons al the interfaces are strongly spin dependent and that it is not necessary to invoke additional diffuse spin-dependent scattering al the interfaces to explain the conductance and magnetoconductance of these samples. C1 TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP Butler, WH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 38 TC 29 Z9 29 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1997 VL 56 IS 22 BP 14574 EP 14582 DI 10.1103/PhysRevB.56.14574 PG 9 WC Physics, Condensed Matter SC Physics GA YL011 UT WOS:A1997YL01100054 ER PT J AU McDonald, J Clem, JR AF McDonald, J Clem, JR TI Microwave response and surface impedance of weak links SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; COUPLED-GRAIN MODEL; THIN-FILMS; JOSEPHSON-JUNCTIONS; CRITICAL-STATE; YBA2CU3O7-X; LOSSES; DEPENDENCE; CURRENTS AB The behavior of superconducting weak links in an ac magnetic field is considered. Both small and long uniform junctions are analyzed. Analytical results are presented for various limiting cases. The general case is solved numerically for different parameter choices and the results are presented. Both similarities and significant differences are found between the small junction and the long uniform junction. C1 IOWA STATE UNIV, DEPT PHYS & ASTRON, AMES, IA 50011 USA. RP McDonald, J (reprint author), IOWA STATE UNIV, AMES LAB, AMES, IA 50011 USA. NR 37 TC 26 Z9 26 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 DEC 1 PY 1997 VL 56 IS 22 BP 14723 EP 14732 DI 10.1103/PhysRevB.56.14723 PG 10 WC Physics, Condensed Matter SC Physics GA YL011 UT WOS:A1997YL01100074 ER PT J AU Esbensen, H Bertsch, GF Hencken, K AF Esbensen, H Bertsch, GF Hencken, K TI Application of contact interactions to Borromean halos SO PHYSICAL REVIEW C LA English DT Article ID STATE PROPERTIES; DRIP-LINE; LI-11; NUCLEI; FRAGMENTATION; EXCITATION; MODEL; HE-6 AB Li-11 and He-6 are described as three-body systems using different approaches. We compare our technique, based on a density-dependent, cutoff, contact interaction between the valence neutrons, with a Faddeev approach which is based on realistic interactions. The ground state properties of a weakly bound two-neutron halo are described fairly well once the contact interaction has been adjusted and calibrated to produce a realistic scattering length and effective range. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA. RP Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 23 TC 119 Z9 122 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3054 EP 3062 DI 10.1103/PhysRevC.56.3054 PG 9 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000020 ER PT J AU Hasan, MA Lee, TSH Vary, JP AF Hasan, MA Lee, TSH Vary, JP TI Mean-field calculation of compressed finite nuclei with Delta excitations SO PHYSICAL REVIEW C LA English DT Article ID MESON-EXCHANGE CALCULATION; SHELL-MODEL; SCATTERING; NN AB The energies and matter densities of finite nuclei under radial compression are predicted by using a constrained Hartree-Fock method with the Delta degree of freedom included. The results are presented for Zr-90 in a calculation within a model space of seven major oscillator shells. The main feature of this calculation is that the effective baryon-baryon interactions associated with the Delta are evaluated within a G-matrix approach based on a coupled-channel NN+N Delta+pi NN model that can describe the NN data up to 1 GeV. It is found thats the nucleus is compressed to about 2-3 times of the ordinary nuclear density, the Delta component is sharply increased to about 10% of all baryons ill the system. This result is consistent with the values extracted from relativistic heavy-ion collisions. C1 Appl Sci Univ, Amman, Jordan. Int Inst Theoret & Appl Phys, Ames, IA 50011 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Hasan, MA (reprint author), Appl Sci Univ, Amman, Jordan. NR 23 TC 9 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3063 EP 3069 DI 10.1103/PhysRevC.56.3063 PG 7 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000021 ER PT J AU Radha, PB Dean, DJ Koonin, SE Langanke, K Vogel, P AF Radha, PB Dean, DJ Koonin, SE Langanke, K Vogel, P TI Gamow-Teller strength distributions in fp-shell nuclei SO PHYSICAL REVIEW C LA English DT Article ID WEAK-INTERACTION RATES; INTERMEDIATE-MASS NUCLEI; ELECTRON-CAPTURE RATES; DOUBLE-BETA-DECAY; MONTE-CARLO; PF SHELL; MODEL; FE-54; CA-48 AB We use the shell model Monte Carlo method to calculate complete 0f1p-shell response functions for Gamow-Teller (GT) operators and obtain the corresponding strength distributions using a maximum entropy technique. The approach is validated against direct diagonalization for (48)Ti. Calculated GT strength distributions agree well with data from (n,p) and (p,n) reactions for nuclei with A=48-64. We also calculate the temperature evolution of the GT, distributions for representative nuclei and find that the GT, distributions broaden and the centroids shift to lower energies with increasing temperature. C1 CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark. CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA. RP Radha, PB (reprint author), Univ Rochester, Laser Energet Lab, 250 E River Rd, Rochester, NY 14623 USA. OI Dean, David/0000-0002-5688-703X NR 48 TC 40 Z9 40 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3079 EP 3086 DI 10.1103/PhysRevC.56.3079 PG 8 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000023 ER PT J AU Barrette, J Bellwied, R Bennett, S Bersch, R Braun-Munzinger, P Chang, WC Cleland, WE Cole, J Cormier, TM Dai, Y David, G Dee, J Dietzsch, O Drigert, M Filimonov, K Johnson, SC Hall, JR Hemmick, TK Herrmann, N Hong, B Kwon, Y Lacasse, R Li, Q Ludlam, TW Mark, SK Matheus, R McCorkle, S Murgatroyd, JT Miskowiec, D O'Brien, E Panitkin, S Piazza, T Pollack, M Pruneau, C Rao, MN Reber, E Rosati, M da Silva, NC Sedykh, S Sonnadara, U Stachel, J Takagui, EM Voloshin, S Vongpaseuth, TB Wang, G Wessels, JP Woody, CL Xu, N Zhang, Y Zou, C AF Barrette, J Bellwied, R Bennett, S Bersch, R Braun-Munzinger, P Chang, WC Cleland, WE Cole, J Cormier, TM Dai, Y David, G Dee, J Dietzsch, O Drigert, M Filimonov, K Johnson, SC Hall, JR Hemmick, TK Herrmann, N Hong, B Kwon, Y Lacasse, R Li, Q Ludlam, TW Mark, SK Matheus, R McCorkle, S Murgatroyd, JT Miskowiec, D O'Brien, E Panitkin, S Piazza, T Pollack, M Pruneau, C Rao, MN Reber, E Rosati, M da Silva, NC Sedykh, S Sonnadara, U Stachel, J Takagui, EM Voloshin, S Vongpaseuth, TB Wang, G Wessels, JP Woody, CL Xu, N Zhang, Y Zou, C CA E877 Collaboration TI Proton and pion production relative to the reaction plane in Au+Au collisions at 11A GeV/c SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; TRANSVERSE FLOW; NUCLEAR COLLISIONS; COLLECTIVE FLOW; AZIMUTHAL CORRELATIONS; HADRONIC MATTER; ENERGY; AGS; DISTRIBUTIONS; EXPANSION AB Results are presented of an analysis of proton and charged pion azimuthal distributions measured with respect to the reaction plane in Au + Au collisions at a beam momentum of about 11A GeV/c. The azimuthal anisotropy is studied as a function of particle rapidity and transverse momentum for different centralities of the collisions. The triple differential (in rapidity, transverse momentum, and azimuthal angle) distributions are reconstructed. A comparison of the results with a previous analysis of charged-particle and transverse energy flow as well as with model predictions are presented. C1 McGill Univ, Dept Phys & Astron, Montreal, PQ H3A 2K6, Canada. Brookhaven Natl Lab, Upton, NY 11973 USA. Gesell Schwerionenforsch GmbH, D-64291 Darmstadt, Germany. Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany. Idaho Natl Engn Lab, Idaho Falls, ID 83402 USA. Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Univ Sao Paulo, Dept Phys, BR-05508 Sao Paulo, Brazil. Wayne State Univ, Dept Phys, Detroit, MI 48202 USA. RP Barrette, J (reprint author), McGill Univ, Dept Phys & Astron, Montreal, PQ H3A 2K6, Canada. RI Sonnadara, Upul/E-6359-2010; Voloshin, Sergei/I-4122-2013 NR 38 TC 113 Z9 113 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3254 EP 3264 DI 10.1103/PhysRevC.56.3254 PG 11 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000041 ER PT J AU Bulgac, A Miller, GA Strikman, M AF Bulgac, A Miller, GA Strikman, M TI Chiral limit of nuclear physics SO PHYSICAL REVIEW C LA English DT Article ID QCD SUM-RULES; MATTER AB We study nuclear physics in the chiral limit (m(u), m(d)=0) in which the pion mass vanishes. We find that the deuteron mass is changed little, but that P-wave nucleon-nucleon scattering volumes are infinite. This motivates an investigation of the possibilities that there could be a two-nucleon P-3(0) bound state, and that the nuclear matter ground state is likely to be a condensed state of nucleons paired to those quantum numbers. However, the short distance repulsion in the nucleon-nucleon potential is not affected by the chiral limit and prevents such new chiral possibilities. Thus the chiral limit physics of nuclei is very similar to that of nature. Using the chiral limit to simplify QCD sum rule calculations of nuclear matter properties seems to be a reasonable approximation. C1 Univ Washington, Dept Phys, Seattle, WA 98195 USA. Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Penn State Univ, University Pk, PA 16802 USA. Russian Acad Sci, Inst Nucl Phys, St Petersburg, Russia. RP Bulgac, A (reprint author), Univ Washington, Dept Phys, POB 351560, Seattle, WA 98195 USA. EM bulgac@phys.washington.edu; miller@phys.washington.edu; strikman@phys.psu.edu OI Bulgac, Aurel/0000-0003-0556-4107 NR 18 TC 16 Z9 16 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 EI 1089-490X J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3307 EP 3310 DI 10.1103/PhysRevC.56.3307 PG 4 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000045 ER PT J AU Maris, P Roberts, CD AF Maris, P Roberts, CD TI pi- and K-meson Bethe-Salpeter amplitudes SO PHYSICAL REVIEW C LA English DT Article ID CHIRAL-SYMMETRY BREAKING; ANALYTIC PROPERTIES; GLUON PROPAGATOR; QUARK PROPAGATOR; VERTEX FUNCTION; GAUGE-THEORIES; MASS-SPECTRUM; CONFINEMENT; EQUATIONS; SPACE AB Independent of assumptions about the form of the quark-quark scattering kernel K, we derive the explicit relation between the flavor-nonsinglet pseudoscalar-meson Bethe-Salpeter amplitude Gamma(H) and the dressed-quark propagator in the chiral limit. In addition to a term proportional to gamma(5), Gamma(H) necessarily contains qualitatively and quantitatively important terms proportional to gamma 5 gamma . P and gamma 5 gamma . kk . P, where P is the total momentum of the bound state. The axial-vector vertex contains a bound state pole described by TH, whose residue is the leptonic decay constant for the bound state. The pseudoscalar vertex also contains such a bound stare pole and, in the chiral limit. the residue of this pole is related to the vacuum quark condensate. The axial-vector Ward-Takahashi identity relates these pole residues, with the Gell-Mann-Oakes-Renner relation a corollary of this identity. The dominant ultraviolet asymptotic behavior of the scalar functions in the meson Bethe-Salpeter amplitude is fully determined by the behavior of the chiral limit quark mass function, and is characteristic of the QCD renormalization group. The rainbow-ladder Ansatz for K, with a simple model for the dressed-quark quark interaction, is used to illustrate and elucidate these general results. The model preserves the one-loop renormalization group structure of QCD. The numerical studies also provide a means of exploring procedures for solving the Bethe-Salpeter equation without a three-dimensional reduction. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Maris, P (reprint author), Argonne Natl Lab, Div Phys, Bldg 203, Argonne, IL 60439 USA. NR 47 TC 348 Z9 350 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3369 EP 3383 DI 10.1103/PhysRevC.56.3369 PG 15 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000053 ER PT J AU Toth, KS Sousa, DC Batchelder, JC Nitschke, JM Wilmarth, PA AF Toth, KS Sousa, DC Batchelder, JC Nitschke, JM Wilmarth, PA TI Decay properties of Tm-154 and observation of fine structure in its alpha-particle spectrum SO PHYSICAL REVIEW C LA English DT Article AB Decay properties of the high-and low-spin isomers of Tm-154 were investigated following the on-line mass separation of A = 154 nuclides produced in Zn-64 irradiations of Mo-92 and (MO)-M-94. The alpha-decay branching ratio of the high-spin isomer was determined and two gamma rays were added to its (beta(+)+EC) decay. In addition, fine-structure peaks were observed in the alpha spectra of both isomers. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Eastern Kentucky Univ, Richmond, KY 40475 USA. RP Toth, KS (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 13 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP 3410 EP 3413 DI 10.1103/PhysRevC.56.3410 PG 4 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000056 ER PT J AU Guglielmetti, A Bonetti, R Poli, G Collatz, R Hu, Z Kirchner, R Roeckl, E Gunn, N Price, PB Weaver, BA Westphal, A Szerypo, J AF Guglielmetti, A Bonetti, R Poli, G Collatz, R Hu, Z Kirchner, R Roeckl, E Gunn, N Price, PB Weaver, BA Westphal, A Szerypo, J TI Nonobservation of C-12 cluster decay of Ba-114 SO PHYSICAL REVIEW C LA English DT Article ID HALF-LIVES; ISOTOPES; IDENTIFICATION; EMISSIONS; SN-100; SEARCH AB By means of the on-line mass separator at Gesellschaft fur Schwerionenforschung, Darmstadt, we produced Ba-114 through the Ni-51(Ni-58,2n) reaction, separated it as a (BaF+)-Ba-114-F-19 beam, and implanted it into a stopper foil positioned in the center of an array of track detectors, which were used to search for C-12 radioactivity of Ba-114. A total number of (5.4+/-1.7)X10(4 114)Ba atoms were implanted. No C-12 event was found after a total exposure time of 116 h, corresponding to a Ni-58 beam dose of 1.3X10(17). The resulting upper limit of 3.4x10(-5) (84% C.L.) for the branching ratio for C-12 decay of Ba-114 is considerably lower than the limits obtained in previous experiments, which represents an inconsistency at levels of more than 90%. A semiempirical estimate of 19.3 MeV for the upper limit of the Q value for C-12 decay of Ba-114 is derived. C1 Univ Milan, Ist Fis Gen Applicata, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Gesell Schwerionenforsch, D-64220 Darmstadt, Germany. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. RP Guglielmetti, A (reprint author), Univ Milan, Ist Fis Gen Applicata, I-20133 Milan, Italy. NR 25 TC 46 Z9 46 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP R2912 EP R2916 PG 5 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000002 ER PT J AU Tostevin, JA Al-Khalili, JS Zahar, M Belbot, M Kolata, JJ Lamkin, K Morrissey, DJ Sherrill, BM Lewitowicz, M Wuosmaa, AH AF Tostevin, JA Al-Khalili, JS Zahar, M Belbot, M Kolata, JJ Lamkin, K Morrissey, DJ Sherrill, BM Lewitowicz, M Wuosmaa, AH TI Elastic and quasielastic scattering of He-8 from C-12 SO PHYSICAL REVIEW C LA English DT Article ID MOMENTUM DISTRIBUTIONS; NEUTRON CORRELATIONS; LI-9 FRAGMENT; MODEL AB We present new calculations and experimental measurements of the quasielastic cross section angular distribution for He-8 scattering from C-12 at 60 MeV/nucleon. He-8 is treated as a five-body alpha + 4n system and the six-body He-8 + target scattering calculations make use of the eikonal few-body method and the cluster orbital shell model approximation for the He-8 wave function. The qualitative features of the new data are successfully described without parameter variation. The sensitivity of the calculations to correlations in the He-8 wave function is assessed. C1 Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA. GANIL, F-14021 Caen, France. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Tostevin, JA (reprint author), Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. RI Sherrill, Bradley/B-4098-2009; Sherrill, Bradley/B-3378-2011 NR 22 TC 14 Z9 14 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1997 VL 56 IS 6 BP R2929 EP R2933 PG 5 WC Physics, Nuclear SC Physics GA YN089 UT WOS:000071132000006 ER PT J AU Abachi, S Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D CastillaValdez, K Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MDC Cutts, D Dahl, OI Davis, K De, K DelSignore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M DiLoreto, G Draper, P Drinkard, J Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldshmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Ha, RE Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JoffeMinor, T Johari, H Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kim, CL Kim, SK Klatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R MaganaMendoza, L Mani, S Mao, HS Markeloff, R Markosky, L Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A deMiranda, JM Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P daMotta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rapidis, PA Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J SanchezHernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A AF Abachi, S Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D CastillaValdez, K Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MDC Cutts, D Dahl, OI Davis, K De, K DelSignore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M DiLoreto, G Draper, P Drinkard, J Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldshmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Ha, RE Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JoffeMinor, T Johari, H Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kim, CL Kim, SK Klatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R MaganaMendoza, L Mani, S Mao, HS Markeloff, R Markosky, L Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A deMiranda, JM Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P daMotta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rapidis, PA Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J SanchezHernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A TI Studies of gauge boson pair production and trilinear couplings SO PHYSICAL REVIEW D LA English DT Article ID ALPHA-S CALCULATION; WW-GAMMA COUPLINGS; ROOT-S=1.8 TEV; P(P)OVER-BAR COLLISIONS; HADRON COLLIDERS; PHOTON COUPLINGS; WZ PRODUCTION; TOP-QUARK; SEARCH; ORDER AB The gauge boson pair production processes W gamma, WW, WZ, and Z gamma were studied using p (p) over bar p collisions corresponding to an integrated luminosity of approximately 14 pb(-1) at a center-of-mass energy of root s = 1.8 TeV. Analysis of W gamma production with subsequent W boson decay to l nu (l = e, mu) is reported, including a fit to the p(T) spectrum of the photons which leads to limits on anomalous WW gamma couplings. A search for WW production with subsequent decay to ll nu<(nu)over bar> (l = e, mu) is presented, leading to an upper limit on the WW production cross section and limits on anomalous WW gamma and WWZ couplings. A search for high p(T) W bosons in WW and WZ production is described, where one W boson decays to an electron and a neutrino and the second W boson or the Z boson decays to two jets. A maximum likelihood fit to the p(T) spectrum of W bosons resulted in limits on anomalous WW gamma and WWZ couplings. A combined fit to the three data sets which provided the tightest limits on anomalous WW gamma and WWZ couplings is also described. Limits on anomalous ZZ gamma and Z gamma gamma couplings are presented from an analysis of the photon E-T spectrum in Z gamma events in the decay channels (ee, mu mu, and nu nu) of the Z boson. [S0556-2821(97)01123-5]. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. BOSTON UNIV,BOSTON,MA 02215. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV BUENOS AIRES,RA-1053 BUENOS AIRES,DF,ARGENTINA. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF IRVINE,IRVINE,CA 92697. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,BRAZIL. CINVESTAV,MEXICO CITY 14000,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV DELHI,DELHI 110007,INDIA. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60607. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV,AMES,IA 50011. KOREA UNIV,SEOUL 136701,SOUTH KOREA. KYUNGSUNG UNIV,PUSAN 608736,SOUTH KOREA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA. UNIV NEBRASKA,LINCOLN,NE 68588. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV OKLAHOMA,NORMAN,OK 73019. PANJAB UNIV,CHANDIGARH 160014,INDIA. MOSCOW HIGH ENERGY PHYS INST,PROTVINO 142284,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77005. UNIV ESTADUAL RIO DE JANEIRO,RIO JANEIRO,BRAZIL. UNIV ROCHESTER,ROCHESTER,NY 14627. CTR ETUD SACLAY,SERV PHYS PARTICLES,DAPNIA,CEA,GIF SUR YVETTE,FRANCE. SEOUL NATL UNIV,SEOUL,SOUTH KOREA. SUNY STONY BROOK,STONY BROOK,NY 11794. TATA INST FUNDAMENTAL RES,MUMBAI 400005,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP Abachi, S (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016; Aihara, Hiroaki/F-3854-2010; Alves, Gilvan/C-4007-2013; Belyaev, Alexander/F-6637-2015; Kim, Sun Kee/G-2042-2015; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013 OI Sznajder, Andre/0000-0001-6998-1108; Baarmand, Marc/0000-0002-9792-8619; Aihara, Hiroaki/0000-0002-1907-5964; Belyaev, Alexander/0000-0002-1733-4408; Kim, Sun Kee/0000-0002-0013-0775; Dudko, Lev/0000-0002-4462-3192; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; NR 53 TC 29 Z9 29 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 6742 EP 6778 DI 10.1103/PhysRevD.56.6742 PG 37 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000003 ER PT J AU Cheng, HC Feng, JL Polonsky, N AF Cheng, HC Feng, JL Polonsky, N TI Superoblique corrections and nondecoupling of supersymmetry breaking SO PHYSICAL REVIEW D LA English DT Article ID WEAK-SCALE SUPERSYMMETRY; LIGHTEST HIGGS BOSON; STANDARD MODEL; RADIATIVE-CORRECTIONS; ELECTROWEAK PARAMETERS; TECHNICOLOR THEORIES; MASSES; GLUINO; UNIFICATION; COLLIDERS AB If supersymmetric partners of the known particles have masses at the multi-TeV scale, they will not be directly discovered at planned future colliders and decouple from most observables. However, such superpartners also induce nondecoupling effects that break the supersymmetric equivalence of gauge boson couplings g(i) and gaugino couplings h(i) through supersymmetric analogues of the oblique corrections. Working within well-motivated theoretical frameworks, we find that multi-TeV scale supersymmetric particles produce deviations at the 1-10 % level in the ratios h(i)/g(i). Such effects allow one to bound the scale of kinematically inaccessible superpartners through precision measurements of processes involving the accessible superparticles. Alternatively, if all superpartners are found, significant deviations imply the existence of highly split exotic supermultiplets. [S0556-2821(97)05223-5]. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. RP Cheng, HC (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 77 TC 52 Z9 52 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 6875 EP 6884 DI 10.1103/PhysRevD.56.6875 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000014 ER PT J AU Amelino-Camelia, G Bjorken, JD Larsson, SE AF Amelino-Camelia, G Bjorken, JD Larsson, SE TI Pion production from baked-Alaska disoriented chiral condensate SO PHYSICAL REVIEW D LA English DT Article ID HIGH-ENERGY COLLISIONS; FIELD; PERSPECTIVE; EVOLUTION; FORM AB We study the various stages of the evolution of chiral condensates disoriented via the ''baked-Alaska'' mechanism, in which the condensates are described as the products of external sources localized on the light cone. Our analysis is based on the classical equations of motion of either the linear or the nonlinear sigma model. We use the associated framework of coherent states and, especially, their source functions to make the connection to the distribution functions for the produced particles. We also compare our classical approach with a mean-field calculation which includes a certain class of quantum corrections. [S0556-2821(97)07123-3]. C1 STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RP UNIV OXFORD, 1 KEBLE RD, OXFORD OX1 3NP, ENGLAND. NR 37 TC 49 Z9 49 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 DEC 1 PY 1997 VL 56 IS 11 BP 6942 EP 6956 DI 10.1103/PhysRevD.56.6942 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000020 ER PT J AU Brodsky, SJ Hautmann, F Soper, DE AF Brodsky, SJ Hautmann, F Soper, DE TI Virtual photon scattering at high energies as a probe of the short distance Pomeron SO PHYSICAL REVIEW D LA English DT Article ID HEAVY FLAVOR PRODUCTION; BFKL POMERON; INFINITE-MOMENTUM; SINGULARITY; COLLISIONS AB Perturbative QCD predicts the behavior of scattering at high energies and fixed (sufficiently large) transferred momentia in terms of the BFKL Pomeron (or short distance Pomeron). We study the prospects for testing these predictions in two-photon processes at CERN LEP 200 and a possible future e(+/-)e(-) collider. We argue that the total cross section for scattering two photons sufficiently far off shell provides a clean probe of BFKL dynamics. The photons act as color dipoles with small transverse size, so that the QCD interactions can be treated perturbatively. We analyze the properties of the QCD result and the possibility testing them experimentally. We give an estimate of the rates expected and discuss the uncertainties of these results associated with the accuracy of the present theoretical calculations. [S0556-2821(97)05421-0]. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. RP Brodsky, SJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 35 TC 107 Z9 107 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 6957 EP 6979 DI 10.1103/PhysRevD.56.6957 PG 23 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000021 ER PT J AU Brodsky, SJ Ellis, J Gardi, E Karliner, M Samuel, MA AF Brodsky, SJ Ellis, J Gardi, E Karliner, M Samuel, MA TI Pade approximants, optimal renormalization scales, and momentum flow in Feynman diagrams SO PHYSICAL REVIEW D LA English DT Article ID ESTIMATING PERTURBATIVE COEFFICIENTS; QUANTUM-FIELD THEORY; TO-LEADING ORDER; QCD; SCHEME; CHROMODYNAMICS; RENORMALONS AB We show that the Pade approximant (PA) approach for resummation of perturbative series in QCD provides a systematic method for approximating the flow of momentum in Feynman diagrams. In the large-beta(0) limit, diagonal PA's generalize the Brodsky-Lepage-Mackenzie (BLM) scale-setting method to higher orders in a renormalization scale- and scheme-invariant manner, using multiple scales that represent Neubert's concept of the distribution of momentum flow through a virtual gluon. If the distribution is non-negative, the PA's have only real roots, and approximate the distribution function by a sum of delta functions, whose locations and weights are identical to the optimal choice provided by the Gaussian quadrature method for numerical integration. We show how the first few coefficients in a perturbative series can set rigorous bounds on the all-order momentum distribution function, if it is positive. We illustrate the method with the vacuum polarization function and the Bjorken sum rule computed in the large-beta(0) limit. [S0556-2821(97)03323-7]. C1 CERN,DIV THEORET PHYS,CH-1211 GENEVA 23,SWITZERLAND. TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078. RP Brodsky, SJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 36 TC 45 Z9 46 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 6980 EP 6992 DI 10.1103/PhysRevD.56.6980 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000022 ER PT J AU Pisarski, RD Trueman, TL Tytgat, MHG AF Pisarski, RD Trueman, TL Tytgat, MHG TI How pi(0)->gamma gamma changes with temperature SO PHYSICAL REVIEW D LA English DT Article ID HARD THERMAL LOOPS; CHIRAL PERTURBATION-THEORY; HOT GAUGE-THEORIES; QUARK-GLUON PLASMA; FINITE-TEMPERATURE; ANOMALOUS PROCESSES; HIGHER DIMENSIONS; SCHWINGER MODEL; VECTOR-MESONS; LAGRANGIANS AB At zero temperature, in the chiral limit the amplitude for pi(0) to decay into two photons is directly related to the coefficient of the axial anomaly. At any nonzero temperature, this direct relationship is lost: while the coefficient of the axial anomaly is independent of temperature, in a thermal bath the anomalous Ward identities do not uniquely constrain the amplitude for pi(0)-->gamma gamma. Explicit calculation shows that to lowest order about zero temperature this amplitude decreases. [S0556-2821(97)00423-2]. RP BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 80 TC 41 Z9 41 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 DEC 1 PY 1997 VL 56 IS 11 BP 7077 EP 7088 DI 10.1103/PhysRevD.56.7077 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000031 ER PT J AU Burakovsky, L Goldman, T Horwitz, LP AF Burakovsky, L Goldman, T Horwitz, LP TI New mass relations for heavy quarkonia SO PHYSICAL REVIEW D LA English DT Article ID ANTIQUARK POTENTIAL MODELS; GLUON STRING MODEL; DUAL-PARTON MODEL; E+E ANNIHILATION; INCLUSIVE SPECTRA; NARROW RESONANCE; HIGH-ENERGIES; DISTRIBUTIONS; DISCOVERY; MESON AB By assuming the existence of (quasi)linear Regge trajectories for heavy quarkonia in the low energy region, we derive a new meson mass relation which shows good agreement with experiment for both charmed and b-flavored mesons. We show that for this relation to avoid depending on the values of the Regge slopes of these (quasi)linear trajectories, it must be of sixth power in meson masses. It may be reduced to a quadratic Gell-Mann-Okubo-type formula by fitting the values of the slopes. For charmed mesons, such a formula holds with an accuracy of similar to 1%, and is in qualitative agreement with the relation obtained previously by the application of the linear mass spectrum to an SU(4) meson multiplet. [S0556-2821(97)05723-8]. C1 TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 RAMAT AVIV,ISRAEL. BAR ILAN UNIV,DEPT PHYS,RAMAT GAN,ISRAEL. RP Burakovsky, L (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B285,LOS ALAMOS,NM 87545, USA. NR 68 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7119 EP 7123 DI 10.1103/PhysRevD.56.7119 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000034 ER PT J AU Burakovsky, L Goldman, T Horwitz, LP AF Burakovsky, L Goldman, T Horwitz, LP TI New quadratic baryon mass relations SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-FLAVORED HADRONS; QUARK-MODEL; CHARMED BARYONS; UNIFIED DESCRIPTION; POTENTIAL MODEL; LATTICE QCD; SUM-RULES; SPECTROSCOPY; REGGE; CHROMODYNAMICS AB By assuming the existence of (quasi)linear baryon Regge trajectories, we derive new quadratic Gell-Mann-Okubo-type baryon mass relations. These relations are used to predict thr masses of the charmed baryons absent from the baryon summary table so far, in good agreement with the predictions of many other approaches. [S0556-2821(97)06223-1]. C1 TEL AVIV UNIV, SCH PHYS & ASTRON, IL-69978 RAMAT AVIV, ISRAEL. BAR ILAN UNIV, DEPT PHYS, RAMAT GAN, ISRAEL. RP LOS ALAMOS NATL LAB, DIV THEORET, MS B285, LOS ALAMOS, NM 87545 USA. NR 75 TC 16 Z9 16 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 DEC 1 PY 1997 VL 56 IS 11 BP 7124 EP 7132 DI 10.1103/PhysRevD.56.7124 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000035 ER PT J AU Carone, CD Hall, LJ Moroi, T AF Carone, CD Hall, LJ Moroi, T TI New mechanism of flavor symmetry breaking from supersymmetric strong dynamics SO PHYSICAL REVIEW D LA English DT Article ID MASS MATRIX MODELS AB We present a class of supersymmetric models in which flavor symmetries are broken dynamically, by a set of composite haven fields. The strong dynamics that is responsible for confinement in the flavor sector also drives flavor symmetry-breaking vacuum expectation values, as a consequence of a quantum-deformed moduli space. Yukawa couplings result as a power series in the ratio of the confinement to Planck scale, and the fermion mass hierarchy depends on the differing number of preens in different flavor symmetry-breaking operators. We present viable non-Abelian and Abelian flavor models that incorporate this mechanism. [S0556-2821(97)01923-1]. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP Carone, CD (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 18 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7183 EP 7192 DI 10.1103/PhysRevD.56.7183 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000040 ER PT J AU Grossman, Y Quinn, HR AF Grossman, Y Quinn, HR TI Removing discrete ambiguities in CP asymmetry measurements SO PHYSICAL REVIEW D LA English DT Article ID STANDARD MODEL; WIDTH DIFFERENCE; B-DECAYS; VIOLATION; PHYSICS; MATRIX; PHASES; GAMMA AB We discuss methods to resolve the ambiguities in CP-violating phase angles phi that are left when a measurement of sin2 phi is made. We show what knowledge of hadronic quantities will be needed to fully resolve all such ambiguities. [S0556-2821(97)06523-5]. RP Grossman, Y (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 39 TC 56 Z9 56 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7259 EP 7266 DI 10.1103/PhysRevD.56.7259 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000047 ER PT J AU Chung, SU AF Chung, SU TI Techniques of amplitude analysis for two-pseudoscalar systems SO PHYSICAL REVIEW D LA English DT Article ID GEV-C; FORMALISM AB The analytical tools needed for an amplitude analysis of two-pseudoscalar systems are described in some detail. Analyses involving two identical spinless particles require a new type of polynomial; the general form of such a polynomial is given for the first time. RP Chung, SU (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 16 TC 47 Z9 48 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7299 EP 7316 DI 10.1103/PhysRevD.56.7299 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000053 ER PT J AU Edin, A Ingelman, G Rathsman, J AF Edin, A Ingelman, G Rathsman, J TI Quarkonium production at the Fermilab Tevatron through soft color interactions SO PHYSICAL REVIEW D LA English DT Article ID GLUON FRAGMENTATION; HEAVY QUARKONIUM; RAPIDITY GAPS; SCATTERING AB The direct charmonium and bottomonium production rate observed at high p(perpendicular to) in p (p) over bar collisions at the Fermilab Tevatron is factors of 10 larger than predictions based on conventional perturbative QCD. We show that this excess can be accounted for by our model for soft color interactions, previously introduced to describe in a novel way the large rapidity gap events observed at DESY HERA. C1 DESY,D-22603 HAMBURG,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP Edin, A (reprint author), UNIV UPPSALA,DEPT RADIAT SCI,BOX 535,S-75121 UPPSALA,SWEDEN. NR 23 TC 50 Z9 50 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7317 EP 7320 DI 10.1103/PhysRevD.56.7317 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000054 ER PT J AU Cao, Z Ding, LK Zhu, QQ He, YD AF Cao, Z Ding, LK Zhu, QQ He, YD TI Cosmic-ray double-core gamma-family events at ultrahigh energies SO PHYSICAL REVIEW D LA English DT Article ID JET CROSS-SECTION; INELASTIC DIFFRACTIVE SCATTERING; NUCLEON-NUMBER DEPENDENCE; LARGE TRANSVERSE-MOMENTUM; HADRON-HADRON COLLISIONS; MULTIPLICITY DISTRIBUTIONS; INCLUSIVE PRODUCTION; QUARK COMPOSITENESS; E+E ANNIHILATION; PAIR PRODUCTION AB We present a detailed account of our analysis on ultrahigh-energy cosmic-ray double-core gamma-family events observed in emulsion chambers at mountain levels. Extending the leading-order perturbative QCD jet calculations for hadron-hadron collisions to hadron-nucleus collisions by including nuclear effects, we performed a Monte Carlo simulation of cosmic-ray particle interaction and propagation in the atmosphere. We find a significant excess of event rates at large transverse momenta with respect to our prediction based on perturbative QCD. The excess cannot be accounted for by a compositeness model of quarks with a characteristic energy scale lower limit Lambda(c)>1.4 TeV or a possible value of Lambda(c) similar or equal to 1.6 TeV from the CDF at the Fermilab Tevatron. We discuss possible onset of new physics indicated by the large discrepancy at E(lab)similar to 10(4)-10(5) TeV, an energy region beyond the reach of existing colliders but within the range of future hadron colliders such as the proposed Large Hadron Collider at CERN. C1 UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. ACAD SINICA,INST HIGH ENERGY PHYS,COSM RAY LAB,BEIJING 100039,PEOPLES R CHINA. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,INST NUCL & PARTICLE ASTROPHYS,BERKELEY,CA 94720. RP Cao, Z (reprint author), UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403, USA. NR 70 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 DEC 1 PY 1997 VL 56 IS 11 BP 7361 EP 7375 DI 10.1103/PhysRevD.56.7361 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000060 ER PT J AU Raja, R AF Raja, R TI Remark on the errors associated with the Dalitz-Goldstein method SO PHYSICAL REVIEW D LA English DT Article AB In a recent paper [R. Raja, Phys. Rev. D 55, 2902 (1997)], it was shown that the Dalitz-Goldstein weighting scheme produced a bias towards lower top quark masses and that unbiased masses result if no weights are used. The statistical errors obtained using the Dalitz-Goldstein scheme were numerically smaller than the unbiased ''no-weights'' method. We comment on possible reasons for this. RP Raja, R (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP 7465 EP 7465 DI 10.1103/PhysRevD.56.7465 PG 1 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000072 ER PT J AU ArkaniHamed, N Murayama, H AF ArkaniHamed, N Murayama, H TI Can the supersymmetric flavor problem be solved by decoupling? SO PHYSICAL REVIEW D LA English DT Article ID HORIZONTAL SYMMETRIES; SOFT TERMS; MASSES; MODEL; SUPERGRAVITY; NATURALNESS; CONSTRAINTS; BREAKING AB It has been argued that the squarks and sleptons of the first and second generations can be relatively heavy without destabilizing the weak scale, thereby improving the situation with too-large flavor-changing neutral current (FCNC) and CP-violating processes; In theories where the soft supersymmetry-breaking parameters are generated at a high scale (such as the Planck scale), we show that such a mass spectrum tends to drive the scalar top quark mass squared m((Q) over tilde 3)(2) negative from two-loop renormalization group evolution. Even ignoring CP violation and allowing O(lambda) similar to 0.22 alignment, the first two generation scalars must be heavier than 22 TeV to suppress FCNCs. This in turn requires the boundary condition on m((Q) over tilde 3)(2) > 4 TeV to avoid negative m((Q) over tilde 3)(2) at the weak scale. Some of the models in the literature employing the anomalous U(1) in string theory are excluded by our analysis. [S0556-2821(97)50121-4]. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP ArkaniHamed, N (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. RI Murayama, Hitoshi/A-4286-2011 NR 27 TC 133 Z9 133 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1997 VL 56 IS 11 BP R6733 EP R6737 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH610 UT WOS:A1997YH61000001 ER PT J AU Watson, G Canright, G Somer, FL AF Watson, G Canright, G Somer, FL TI Reasonable and robust Hamiltonians violating the third law of thermodynamics SO PHYSICAL REVIEW E LA English DT Article ID DISORDERED GROUND-STATES; DEGENERACY; MODEL AB It has recently been shown that the third law of thermodynamics is violated by an entire class of classical Hamiltonians in one dimension, over a finite volume of coupling-constant space, assuming only that certain elementary symmetries are exact, and that the interactions are finite ranged. However, until now, only the existence of such Hamiltonians was known, while almost nothing was known of the nature of the couplings. Here we show how to define the subvolume of these Hamiltonians-a "wedge" W in a d-dimensional space-in terms of simple properties of a directed graph. We then give a simple expression for a specific Hamiltonian H* in this wedge, and show that H* is a physically reasonable Hamiltonian, in the sense that its coupling constants lie within an envelope that decreases smoothly, as a function of the range I, to zero at l= r+1, where r is the range of the interaction. C1 Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Watson, G (reprint author), Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. NR 16 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1997 VL 56 IS 6 BP 6459 EP 6465 DI 10.1103/PhysRevE.56.6459 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500039 ER PT J AU Boettcher, S AF Boettcher, S TI Aging exponents in self-organized criticality SO PHYSICAL REVIEW E LA English DT Article ID PUNCTUATED-EQUILIBRIUM; SPIN-GLASSES; BIOLOGICAL EVOLUTION; AVALANCHE DYNAMICS; SIMPLE-MODEL; EARTHQUAKES; MEMORY; PILE AB In a recent Letter [Phys. Rev. Lett. 79, 889 (1947)] we demonstrated that the avalanches in the Bak-Sneppen model display aging behavior similar to glassy systems. Numerical results for temporal correlations show a broad distribution with two distinct regimes separated by a time scale that is related to the age of the avalanche. This dynamical breaking of time-translational invariance results in a previously unrecognized critical exponent r. Here we present results for r from extensive numerical simulations of self-organized critical models in d=1 and 2. We find r(d=1) =0.45=/-0.05 and r(d=2)=0.23+/-0.05 for the Bak-Sneppen model, and our results suggest r= 1/4 for the analytically tractable multitrade model in both dimensions. C1 Clark Atlanta Univ, Ctr Theoret Studies Phys Syst, Atlanta, GA 30314 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Boettcher, S (reprint author), Clark Atlanta Univ, Ctr Theoret Studies Phys Syst, Atlanta, GA 30314 USA. RI Boettcher, Stefan/G-2640-2010 OI Boettcher, Stefan/0000-0003-1273-6771 NR 36 TC 8 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1997 VL 56 IS 6 BP 6466 EP 6474 DI 10.1103/PhysRevE.56.6466 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500040 ER PT J AU Ben-Naim, E Krapivsky, PL AF Ben-Naim, E Krapivsky, PL TI Stationary velocity distributions in traffic flows SO PHYSICAL REVIEW E LA English DT Article ID MODEL; CONGESTION AB We introduce a traffic flow model that incorporates clustering and passing. We obtain analytically the steady state characteristics of the flow from a Boltzmann-like equation. A single dimensionless parameter, R = c(0) upsilon(0)t(0) with c(0) the concentration, upsilon(0) the velocity range, and t(0)(-1) the passing rate, determines the nature of the steady state. When R much less than 1, uninterrupted flow with single cars occurs. When R much greater than 1, large clusters with average mass [m] similar to R-alpha form, and the flux is J similar to R-gamma. The initial distribution of slow cars governs the statistics. When P-0(upsilon) similar to upsilon(mu) as upsilon --> 0, the scaling exponents are gamma = 1/(mu + 2), alpha = 1/2 when mu > 0, and alpha = (mu + 1)/(mu + 2) when mu < 0. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. RP Ben-Naim, E (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Ben-Naim, Eli/C-7542-2009; Krapivsky, Pavel/A-4612-2014 OI Ben-Naim, Eli/0000-0002-2444-7304; NR 27 TC 25 Z9 26 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 DEC PY 1997 VL 56 IS 6 BP 6680 EP 6686 DI 10.1103/PhysRevE.56.6680 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500061 ER PT J AU He, XY Luo, LS AF He, XY Luo, LS TI Theory of the lattice Boltzmann method: From the Boltzmann equation to the lattice Boltzmann equation SO PHYSICAL REVIEW E LA English DT Article ID NAVIER-STOKES EQUATION; PARTICULATE SUSPENSIONS; NUMERICAL SIMULATIONS; GAS AUTOMATA; MODEL; FLUID; HYDRODYNAMICS AB In this paper, the lattice Boltzmann equation is directly derived from the Boltzmann equation. It is shown that the lattice Boltzmann equation is a special discretized form of the Boltzmann equation. Various approximations for the discretization of the Boltzmann equation in both time and phase space are discussed in detail. A general procedure to derive the lattice Boltzmann model from the continuous Boltzmann equation is demonstrated explicitly. The lattice Boltzmann models derived include the two-dimensional 6-bit, 7-bit, and 9-bit, and three-dimensional 27-bit models. C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Complex Syst Grp T13, Los Alamos, NM 87545 USA. NASA, Langley Res Ctr, ICASE, Hampton, VA 23681 USA. RP He, XY (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS-B258, Los Alamos, NM 87545 USA. RI Luo, Li-Shi/A-4561-2011 OI Luo, Li-Shi/0000-0003-1215-7892 NR 46 TC 746 Z9 767 U1 17 U2 114 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 DEC PY 1997 VL 56 IS 6 BP 6811 EP 6817 DI 10.1103/PhysRevE.56.6811 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500077 ER PT J AU Bailey, JE MacFarlane, JJ Wang, P Carlson, AL Haill, TA Johnson, DJ Lake, P McGuire, EJ Mehlhorn, TA AF Bailey, JE MacFarlane, JJ Wang, P Carlson, AL Haill, TA Johnson, DJ Lake, P McGuire, EJ Mehlhorn, TA TI Measurements of planar target heating by an intense lithium ion beam SO PHYSICAL REVIEW E LA English DT Article ID INERTIAL CONFINEMENT FUSION; LASER-PRODUCED PLASMAS; X-RAY SPECTROSCOPY; ALUMINUM PLASMAS; PBFA-II; MULTIPLE IONIZATION; PROTON-BEAMS; SPECTRA; HEAVY; DIAGNOSTICS AB The heating of a planar multilayer (CH-Au-Al-CH) foil target by an intense lithium ion beam is measured using time-integrated spectroscopy of K alpha x-ray satellite emission from the Al layer. The time-resolved beam irradiance, kinetic energy, and focal spot size are simultaneously measured using lithium ions Rutherford scattered from the foil. The approximately 20 ns full width at half maximum, 10 MeV peak kinetic energy, Li3+ ion beam deposited up to 435 TW/g (+/-30%) in the Al layer. The peak electron temperature reached in the Al layer is estimated to be 38-43 eV by comparing the relative emission intensities from the He-like and Li-like Al with collisional-radiative-equilibrium (CRE) calculations. The data are used to examine one-dimensional radiation-hydrodynamic simulations that calculate the target plasma temperature and density using the measured beam parameters as input. It was found that a detailed CRE treatment of the atomic level populations and the line transport is essential for accurate calculations of the radiation loss from the ion heated target. Simulations that include such a treatment embedded within the radiation-hydrodynamic calculations are in good agreement with the data, within the experimental uncertainties. The methods developed here for observation and analysis of K alpha spectra provide a sensitive tool suitable for the more stringent examinations of intense ion beam-matter interaction models that will ultimately be required for light-ion driven fusion. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Wisconsin, Fus Technol Inst, Madison, WI 53706 USA. K Tech Corp, Albuquerque, NM 87110 USA. RP Bailey, JE (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 60 TC 3 Z9 3 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 DEC PY 1997 VL 56 IS 6 BP 7147 EP 7158 DI 10.1103/PhysRevE.56.7147 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500113 ER PT J AU Tremaine, A Rosenzweig, J Schoessow, P AF Tremaine, A Rosenzweig, J Schoessow, P TI Electromagnetic wake fields and beam stability in slab-symmetric dielectric structures SO PHYSICAL REVIEW E LA English DT Article ID LINEAR COLLIDERS; PLASMA AB Several promising schemes for high-gradient acceleration of charged particles in slab-symmetric electromagnetic structures have been recently proposed. In this paper we investigate, by both computer simulation and theoretical analysis, the longitudinal and transverse wake fields experienced by a relativistic charged particle beam in a planar structure. We show that in the limit of an infinitely wide beam the net deflecting wake fields vanishes. This result is verified in the limit of a large aspect ratio (sheet) beam by finite beam analysis based on a Fourier decomposition of the current profile, as well as a paraxial wave analysis of the wake fields driven by Gaussian profile beams. The Fourier analysis forms the basis of an examination of flute instability in the sheet beam system. Practical implications of this result for beam stability and enhanced current loading in short-wavelength advanced accelerators are discussed. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Tremaine, A (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, 405 Hilgard Ave, Los Angeles, CA 90095 USA. NR 16 TC 57 Z9 57 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 DEC PY 1997 VL 56 IS 6 BP 7204 EP 7216 DI 10.1103/PhysRevE.56.7204 PG 13 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500120 ER PT J AU Cai, D Bishop, AR Gronbech-Jensen, N AF Cai, D Bishop, AR Gronbech-Jensen, N TI Resonance in the collision of two discrete intrinsic localized excitations SO PHYSICAL REVIEW E LA English DT Article ID KINK-ANTIKINK INTERACTIONS; 2-DIMENSIONAL ANHARMONIC LATTICES; NONLINEAR SCHRODINGER-EQUATIONS; WEAKLY COUPLED OSCILLATORS; HAMILTONIAN NETWORKS; MODES; BREATHERS; EXISTENCE; STABILITY; SYSTEMS AB The collision dynamics of two solitonlike localized excitations in a nonintegrable discrete (1 x 1)-dimensional nonlinear Schrodinger system is studied numerically. It is demonstrated that the collision dynamics exhibits a complicated resonance structure of interlacing bound-state regions and escape regions of localized excitations with a sensitive dependence on the incoming energies of the localized excitations. We emphasize that this resonance is a combined effect of discreteness and nonintegrability of the system and contrast it with topological kink-antikink collisions in phi(4) and related systems. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Cai, D (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 38 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD DEC PY 1997 VL 56 IS 6 BP 7246 EP 7252 DI 10.1103/PhysRevE.56.7246 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500126 ER PT J AU Borzsak, I Cummings, PT AF Borzsak, I Cummings, PT TI Electrofreezing of water in molecular dynamics simulation accelerated by oscillatory shear SO PHYSICAL REVIEW E LA English DT Article ID SUPERCRITICAL WATER; LIQUID WATER; COMPUTER-SIMULATION; ICE AB We present a study of the effect of oscillatory shear on the crystallization of supercooled water in nonequilibrium molecular dynamics simulations of simple water models. [The TIP4P model has been used throughout; calculations using the extended simple point charge (SPC/E) model were checked for consistency and gave qualitatively the same results.] The application of a planar Couette flow field alone did not result in crystallization but in combination with a static electric field different isomorphs of ice emerged depending on the state of the system. At high pressures (3 - 5 kbar) the oscillatory shear substantially speeded up the formation of the conjectured ice polymorph (ice XII). At ambient pressures lower density systems could be forced to order in situations where hitherto the application of the electric field alone has not resulted in ordering. These results suggest that this method will be very useful in exploration of the fluid-solid boundaries of the phase diagram of models for water. C1 Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RP Borzsak, I (reprint author), Univ Tennessee, Dept Chem Engn, 419 Dougherty Engn Bldg, Knoxville, TN 37996 USA. RI Cummings, Peter/B-8762-2013 OI Cummings, Peter/0000-0002-9766-2216 NR 20 TC 13 Z9 13 U1 1 U2 5 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 DEC PY 1997 VL 56 IS 6 BP R6279 EP R6282 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YM237 UT WOS:000071043500015 ER PT J AU Zaerpoor, K Chan, YD DiGregorio, DE Dragowsky, MR Hindi, MM Isaac, MCP Krane, KS Larimer, RM Macchiavelli, AO Macleod, RW Miocinovic, P Norman, EB AF Zaerpoor, K Chan, YD DiGregorio, DE Dragowsky, MR Hindi, MM Isaac, MCP Krane, KS Larimer, RM Macchiavelli, AO Macleod, RW Miocinovic, P Norman, EB TI Galactic confinement time of iron-group cosmic rays derived from the Mn-54 chronometer SO PHYSICAL REVIEW LETTERS LA English DT Article ID ISOTOPIC COMPOSITION; HALF-LIFE; PROPAGATION; NUCLEI; AGE AB The beta-decay half-life of Mn-54 is needed to employ this isotope as a cosmic ray chronometer. We have determined the partial half-life of Mn-54 for positron emission by counting a highly purified 35-mu Ci source of Mn-54 in GAMMASPHERE to search for the astrophysically interesting beta(+) decay branch through the observation of coincident positron annihilation gamma rays. A careful analysis of 97 hours of source counting and 61 hours of background shows a net signal of 24 +/- 10 back-to-back 511-511 keV coincident events. Based on this result, the branch for this decay mode is (2.2 +/- 0.9) x 10(-7)%. The implications of this result for the Mn-54 cosmic-ray chronometer problem are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. COMIS NACL ENERGIA ATOM,LAB TANDAR,RA-1429 BUENOS AIRES,DF,ARGENTINA. TENNESSEE TECHNOL UNIV,DEPT PHYS,COOKEVILLE,TN 38505. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP Zaerpoor, K (reprint author), OREGON STATE UNIV,DEPT PHYS,CORVALLIS,OR 97331, USA. NR 16 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 1 PY 1997 VL 79 IS 22 BP 4306 EP 4309 DI 10.1103/PhysRevLett.79.4306 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800003 ER PT J AU Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z CastillaValdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K DelSignore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M DiLoreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JoffeMinor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK Klatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R MaganaMendoza, L Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P daMotta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J SanchezHernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z CastillaValdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C CullenVidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K DelSignore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M DiLoreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U HernandezMontoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JoffeMinor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK Klatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J LiDemarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R MaganaMendoza, L Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P daMotta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J SanchezHernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A TI Search for scalar leptoquark pairs decaying to electrons and jets in (p)over-bar-p collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID DETECTOR AB We have searched for the pair production of first generation scalar leptoquarks in the eejj channel using the full data set (123 pb(-1)) collected with the DO detector at the Fermilab Tevatron during 1992-1996. We observe no candidates with an expected background of approximately 0.4 events. Comparing the experimental 95% confidence level upper limit to theoretical calculations of the cross section with the assumption of a 100% branching fraction of eq, we set a lower limit on the mass of a first generation scalar leptoquark of 225 GeV/c(2). The results of this analysis rule out the interpretation of the excess of high Q(2) events at DESY HERA as leptoquarks which decay exclusively to eq. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. BOSTON UNIV,BOSTON,MA 02215. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV BUENOS AIRES,BUENOS AIRES,DF,ARGENTINA. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF IRVINE,IRVINE,CA 92697. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,BRAZIL. CINVESTAV,MEXICO CITY 10027,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV DELHI,DELHI 110007,INDIA. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60607. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV,AMES,IA 50011. KOREA UNIV,SEOUL 136701,SOUTH KOREA. KYUNGSUNG UNIV,PUSAN 608736,SOUTH KOREA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA. UNIV NEBRASKA,LINCOLN,NE 68588. NORTHWESTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV OKLAHOMA,NORMAN,OK 73019. PANJAB UNIV,CHANDIGARH 160014,INDIA. PROTVINO HIGH ENERGY PHYS INST,PROTVINO 142284,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77005. UNIV ESTADO RIO DE JANEIRO,RIO JANEIRO,BRAZIL. UNIV ROCHESTER,ROCHESTER,NY 14627. CTR ETUD SACLAY,CEA,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE. SEOUL NATL UNIV,SEOUL,SOUTH KOREA. SUNY STONY BROOK,STONY BROOK,NY 11794. TATA INST FUNDAMENTAL RES,MUMBAI 400005,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP Abbott, B (reprint author), NYU,NEW YORK,NY 10003, USA. RI Belyaev, Alexander/F-6637-2015; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Roe, Natalie/A-8798-2012; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016 OI Belyaev, Alexander/0000-0002-1733-4408; Aihara, Hiroaki/0000-0002-1907-5964; Dudko, Lev/0000-0002-4462-3192; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Kim, Sun Kee/0000-0002-0013-0775; Sznajder, Andre/0000-0001-6998-1108 NR 25 TC 55 Z9 55 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 DEC 1 PY 1997 VL 79 IS 22 BP 4321 EP 4326 DI 10.1103/PhysRevLett.79.4321 PG 6 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800007 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bolognesi, V Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cen, Y Cerri, A Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guimaraes, J Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kongeter, A Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, H Liss, TH Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R Mazzanti, P McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Sganos, G Shah, T Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strait, J Strohmer, R Strumia, F Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bolognesi, V Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cen, Y Cerri, A Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guimaraes, J Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kongeter, A Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, H Liss, TH Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R Mazzanti, P McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Sganos, G Shah, T Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strait, J Strohmer, R Strumia, F Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S TI Search for first generation leptoquark pair production in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID (P)OVER-BAR-P COLLISIONS; SCALAR LEPTOQUARKS; SYMMETRY-BREAKING; Z0 DECAYS; DETECTOR; MODELS; QUARK AB We present the results of a search for first generation scalar leptoquarks pairs (S-1 (S)over-bar(1)) in 110 +/- 7 pb(-1) of data collected by the Collider Detector at Fermilab. We assume both leptoquarks decay to an electron and a quark. Three candidate events, with masses below 140 GeV/c(2) and consistent with background expectations, are observed. We obtain a 95% confidence level upper limit on the production cross section as a function of the leptoquark mass. Using a next-to-leading order calculation of S-1 (S)over-bar(1) production, we exclude scalar leptoquarks with mass less than 213 GeV/c(2) at 95% C.L. for a branching ratio into eq equal to 1. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27708. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV FLORIDA,GAINESVILLE,FL 33611. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. HARVARD UNIV,CAMBRIDGE,MA 02138. HIROSHIMA UNIV,HIGASHIHIROSHIMA 724,JAPAN. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ H3A 2T8,CANADA. UNIV TORONTO,TORONTO,ON M5S 1A7,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV KARLSRUHE,INST EXPT KERNPHYS,D-76128 KARLSRUHE,GERMANY. ERNEST ORLANDO LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. OHIO STATE UNIV,COLUMBUS,OH 43310. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-36132 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV PITTSBURGH,PITTSBURGH,PA 15260. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. ACAD SINICA,TAIPEI 11530,TAIWAN. TEXAS A&M UNIV,COLLEGE STN,TX 77843. TEXAS TECH UNIV,LUBBOCK,TX 79409. UNIV TSUKUBA,TSUKUBA,IBARAKI 315,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. WASEDA UNIV,TOKYO 169,JAPAN. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06520. RP Abe, F (reprint author), NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 315,JAPAN. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014; Introzzi, Gianluca/K-2497-2015 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787; Introzzi, Gianluca/0000-0002-1314-2580 NR 33 TC 62 Z9 63 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 1 PY 1997 VL 79 IS 22 BP 4327 EP 4332 DI 10.1103/PhysRevLett.79.4327 PG 6 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800008 ER PT J AU Blanpied, G Blecher, M Caracappa, A Djalali, C Giordano, G Hicks, K Hoblit, S Khandaker, M Kistner, OC Kuczewski, A Lowry, M Lucas, M Matone, G Miceli, L Preedom, B Rebreyend, D Sandorfi, AM Schaerf, C Sealock, RM Stroher, H Thorn, CE Thornton, ST Tonnison, J Whisnant, CS Zhang, H Zhao, X AF Blanpied, G Blecher, M Caracappa, A Djalali, C Giordano, G Hicks, K Hoblit, S Khandaker, M Kistner, OC Kuczewski, A Lowry, M Lucas, M Matone, G Miceli, L Preedom, B Rebreyend, D Sandorfi, AM Schaerf, C Sealock, RM Stroher, H Thorn, CE Thornton, ST Tonnison, J Whisnant, CS Zhang, H Zhao, X TI N->Delta transition from simultaneous measurements of p((gamma)over-right-arrow,pi) and p((gamma)over-right-arrow,gamma) SO PHYSICAL REVIEW LETTERS LA English DT Article ID DELTA-RESONANCE REGION; PION-PHOTOPRODUCTION; COMPTON-SCATTERING; PROTON; MODEL AB New high-precision measurements of p((gamma)over-right-arrow,pi) and p((gamma)over-right-arrow,gamma) cross sections and beam asymmetries have been combined with other polarization ratios in a simultaneous analysis of both reactions. Compton scattering has provided two important new constraints on the photopion amplitude. The E2/M1 mixing ratio for the N --> delta transition extracted from this analysis is [-3.0 +/- 0.3(stat + syst) +/- 0.2 (model)]%. Both data and analysis of this work are in conflict with recent results from Mainz. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ROMA TOR VERGATA,ROME,ITALY. IST NAZL FIS NUCL,SEZ ROMA 2,ROME,ITALY. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. OHIO UNIV,DEPT PHYS,ATHENS,OH 45701. UNIV GIESSEN,INST PHYS 2,GIESSEN,GERMANY. RP Blanpied, G (reprint author), UNIV S CAROLINA,DEPT PHYS,COLUMBIA,SC 29208, USA. NR 38 TC 145 Z9 147 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 DEC 1 PY 1997 VL 79 IS 22 BP 4337 EP 4340 DI 10.1103/PhysRevLett.79.4337 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800010 ER PT J AU Hjort, EL Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Elliott, JB Gilkes, ML Hauger, JA Hirsch, AS Insolia, A Justice, M Keane, D Kintner, JC Lisa, MA Matis, HS McMahan, M McParland, C Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, M Tuve, C Wang, S Warren, PG Wieman, HH Wienold, T Wolf, K AF Hjort, EL Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Elliott, JB Gilkes, ML Hauger, JA Hirsch, AS Insolia, A Justice, M Keane, D Kintner, JC Lisa, MA Matis, HS McMahan, M McParland, C Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, M Tuve, C Wang, S Warren, PG Wieman, HH Wienold, T Wolf, K TI Delta resonance production in Ni-58+Cu collisions at E=1.97A GeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEUS COLLISIONS; TRANSVERSE-MOMENTUM; PION-PRODUCTION; GEV/NUCLEON; EXCITATION; ENERGY AB Invariant mass analyses of (p, pi(+/-)) pairs in Ni-58 + Cu collisions at 1.97A GeV have been performed and show correlations resulting from the decays of the Delta resonance, the Lambda baryon, and possibly the N*(1440) resonance. A reduction in the Delta mass is observed and the mass reduction increases with collision centrality. Events generated by the relativistic cascade model (ARC) also reveal a mass reduction. The mass reduction is related to the size of the reaction volume and the details of Delta production mechanisms in heavy ion collisions. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. KENT STATE UNIV,KENT,OH 44242. UNIV CALIF DAVIS,DAVIS,CA 95616. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV CATANIA,I-95129 CATANIA,ITALY. IST NAZL FIS NUCL,SEZ CATANIA,I-95129 CATANIA,ITALY. RP Hjort, EL (reprint author), PURDUE UNIV,W LAFAYETTE,IN 47907, USA. RI Insolia, Antonio/M-3447-2015; TUVE', Cristina/P-3933-2015 OI Insolia, Antonio/0000-0002-9040-1566; TUVE', Cristina/0000-0003-0739-3153 NR 18 TC 38 Z9 40 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 DEC 1 PY 1997 VL 79 IS 22 BP 4345 EP 4348 DI 10.1103/PhysRevLett.79.4345 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800012 ER PT J AU Grossman, JC Mitas, L AF Grossman, JC Mitas, L TI High accuracy molecular heats of formation and reaction barriers: Essential role of electron correlation SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM MONTE-CARLO; UNIMOLECULAR TRIPLE DISSOCIATION; DENSITY-FUNCTIONAL THEORY; TRANSITION-STATE; EXACT EXCHANGE; S-TETRAZINE; CYCLOOCTATETRAENE; ATOMS; AZABENZENES; GEOMETRY AB We demonstrate that the quantum Monte Carlo (QMC) methodology (i) provides barrier heights and heats of formation within similar to 0.05 eV of experimental values, (ii) confirms recent measurements for the ring inversion of cyclo-octatetraene, and (iii) enables us to predict quantities not yet measured. Density functional methods show a mixed performance in achieving the accuracy required for predictive calculations. Further comparisons show that QMC is competitive in accuracy with the best correlated wave function methods while being applicable to much larger systems because of more favorable scaling. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV ILLINOIS, NATL CTR SUPERCOMP APPLICAT, URBANA, IL 61801 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 33 TC 40 Z9 40 U1 0 U2 5 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 DEC 1 PY 1997 VL 79 IS 22 BP 4353 EP 4356 DI 10.1103/PhysRevLett.79.4353 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800014 ER PT J AU Pasternak, MP Rozenberg, GK Milner, AP Amanowicz, M Zhou, T Schwarz, U Syassen, K Taylor, RD Hanfland, M Brister, K AF Pasternak, MP Rozenberg, GK Milner, AP Amanowicz, M Zhou, T Schwarz, U Syassen, K Taylor, RD Hanfland, M Brister, K TI Pressure-induced concurrent transformation to an amorphous and crystalline phase in berlinite-type FePO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID ALPHA-QUARTZ; INDUCED AMORPHIZATION; MEMORY-GLASS; ALPO4; TRANSITION; ALPHA-ALPO4; PHOSPHATE; BEHAVIOR; ALASO4; GAPO4 AB X-ray diffraction, Raman scattering, and Mossbauer spectroscopy provide a diverse description of the high pressure behavior of berlinite-type FePO4. At a pressure of 2.5(5) GPa, a transformation to a coexisting new crystalline (chp) and amorphous (ahp) phase is observed with about equal abundance. The chp phase is identified as a VCrO4 type, where Fe-III and P-V ions, respectively, are sixfold and fourfold coordinated. In the 6-25 GPa range and after decompression, the relative abundance of the chp and ahp phases remains unchanged. These phenomena of concurrent amorphous and crystalline transformations at low hydrostatic pressure and stable abundance ratio over a large pressure range are unique in pressure-induced structural transformations of SiO2 analogs. C1 MAX PLANCK INST FESTKORPERFORSCH,D-70569 STUTTGART,GERMANY. LOS ALAMOS NATL LAB,MST10,LOS ALAMOS,NM 87545. EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE. CORNELL UNIV,CORNELL HIGH ENERGY SYNCHROTRON SOURCE,WILSON LAB,ITHACA,NY 14853. RP Pasternak, MP (reprint author), TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 28 TC 52 Z9 52 U1 3 U2 24 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 DEC 1 PY 1997 VL 79 IS 22 BP 4409 EP 4412 DI 10.1103/PhysRevLett.79.4409 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800028 ER PT J AU Kellogg, GL AF Kellogg, GL TI Hydrogen inhibition of exchange diffusion on Pt(100) SO PHYSICAL REVIEW LETTERS LA English DT Article ID BY-LAYER GROWTH; SURFACE-DIFFUSION; EPITAXIAL-GROWTH; ADSORPTION; PT(111); PT(001); NUCLEATION; MECHANISM; METAL; ATOMS AB Field ion microscope observations show that the diffusion rate of Pt atoms on Pt(100) is significantly reduced when the surface is exposed to hydrogen. A hydrogen partial pressure of 1 x 10(-10) Torr causes the exchange diffusion rate to decrease by similar to 3 orders of magnitude over 2-3 hours. Higher pressures suppress exchange displacements to the point where hopping displacements become energetically accessible. The ability to influence both the displacement rate and the transport mechanism indicates that hydrogen may be used to control thin-film growth at the atomic level. RP Kellogg, GL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 26 TC 22 Z9 22 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 1 PY 1997 VL 79 IS 22 BP 4417 EP 4420 DI 10.1103/PhysRevLett.79.4417 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800030 ER PT J AU Moon, JS Simmons, JA Reno, JL Johnson, BL AF Moon, JS Simmons, JA Reno, JL Johnson, BL TI Multiterminal capacitance tensor elements of composite fermions and anomalous capacitance peaks at even denominator fillings SO PHYSICAL REVIEW LETTERS LA English DT Article ID LANDAU-LEVEL; EDGE STATES; REFLECTION PROBABILITIES; MAGNETOTRANSPORT; TRANSMISSION; CONDUCTANCE; CURRENTS; DYNAMICS AB We experimentally determine the propagation direction of fractional quantum Hall effect (FQHE) edge states via the symmetry properties of the multiterminal capacitances of two dimensional electron gases. Although strong asymmetries with respect to zero magnetic field appear, no asymmetries with respect to even denominator Landau level filling factor nu are seen. This indicates that current-carrying FQHE edge states propagate in the same direction as integer QHE edge states, consistent with a composite fermion gauge effective electric field. We also observe anomalous capacitance features indicative of enhanced bulk conduction at nu = 1/2, 3/2, and 3/4. C1 WESTERN WASHINGTON UNIV,DEPT PHYS,BELLINGHAM,WA 98225. MICHIGAN STATE UNIV,DEPT PHYS,E LANSING,MI 48824. RP Moon, JS (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 26 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 1 PY 1997 VL 79 IS 22 BP 4457 EP 4460 DI 10.1103/PhysRevLett.79.4457 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800040 ER PT J AU Shan, YY Lynn, KG Szeles, C AsokaKumar, P Thio, T Bennett, JW Beling, CB Fung, S Becla, P AF Shan, YY Lynn, KG Szeles, C AsokaKumar, P Thio, T Bennett, JW Beling, CB Fung, S Becla, P TI Microscopic structure of DX centers in Cd0.8Zn0.2Te:Cl SO PHYSICAL REVIEW LETTERS LA English DT Article ID DONORS AB Photoexcitation of chlorine DX centers induces a transition of the Cl atoms to the shallow-donor state and persistent photoconductivity at low temperature in Cd0.8Zn0.2Te:Cl. The relaxation of the substitutional Cl atoms to the DX state at 140 K is coincident with a decrease of the positron lineshape parameter and an increase of annihilation with high-momentum core electrons. The results indicate positron trapping and annihilation at DX centers and at chlorine A centers. The data support the bond breaking model of the DX centers and the outward relaxation of the Cl and Cd(Zn) atoms along the [111] direction. The thermal barrier for the shallow-deep transition was found to be 0.44 eV. C1 EV PROD, SAXONBURG, PA 16056 USA. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NEC RES INST, PRINCETON, NJ 08540 USA. UNIV HONG KONG, DEPT PHYS, HONG KONG, HONG KONG. MIT, DEPT MAT SCI & ENGN, CAMBRIDGE, MA 02139 USA. RP WASHINGTON STATE UNIV, DEPT PHYS, PULLMAN, WA 99164 USA. RI Fung, Stevenson/D-3081-2009 NR 16 TC 7 Z9 7 U1 0 U2 5 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 DEC 1 PY 1997 VL 79 IS 22 BP 4473 EP 4476 DI 10.1103/PhysRevLett.79.4473 PG 4 WC Physics, Multidisciplinary SC Physics GA YJ388 UT WOS:A1997YJ38800044 ER PT J AU Brow, RK Tallant, DR Warren, WL McIntyre, A Day, DE AF Brow, RK Tallant, DR Warren, WL McIntyre, A Day, DE TI Spectroscopic studies of the structure of titanophosphate and calcium titanophosphate glasses SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID TITANIUM PHOSPHATE-GLASSES; SHORT-RANGE STRUCTURE; NMR CHEMICAL-SHIFTS; VIBRATIONAL-SPECTRA; OPTICAL-ABSORPTION; RAMAN-SPECTROSCOPY; SILICATE-GLASSES; SYSTEM; EXAFS AB The polyhedral arrangements in xTiO(2 .)(1-x)P2O5 (0.55 less than or equal to x less than or equal to 0.70) and yTiO(2 .)(1-y)Ca(PO3)(2) glasses have been characterised by Raman spectroscopy, electron spin resonance (ESR) spectroscopy and solid state P-31 magic angle nuclear magnetic resonance (MAS NMR) spectroscopy In the binary titanophosphate glasses, structures consist of distorted Ti octahedra linked to orthophosphate units through Ti-O-P bonds. There is evidence for Ti-O-Ti linkages in the Raman spectra from glasses with the highest TiO2 contents. When titania is added to calcium metaphosphate glass, phosphate chains are depolymerised by the incorporation of distorted Ti(5) and Ti(6) units through Ti-O-P bonds. Pyrophosphate units are present in glasses with the highest TiO2 contents. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Missouri, Rolla, MO 65401 USA. RP Brow, RK (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 34 TC 88 Z9 89 U1 2 U2 18 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD DEC PY 1997 VL 38 IS 6 BP 300 EP 306 PG 7 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA YV402 UT WOS:000071819400004 ER PT J AU Olson, AP AF Olson, AP TI Quantum vortex structure of mesons and baryons SO PHYSICS ESSAYS LA English DT Article DE quantum vortex; vortex dipole; meson masses; baryon masses; internal structure of mesons and baryons; strong interactions ID FLUID; VORTICES; MASSES AB Spin: what is if, and what does it do, if anything, to define particle form, mass, and interactions A quantum vortex model (QVM) of the proton is described and extended to mesons and to excited baryon states, The internal energy components and rest masses of a wide variety of mesons and baryons are shown to be precisely calculable from the properties of systems of quantum vortices, from the eigenmodes of the proton, and from other vacuum excitations consisting of particle-antiparticle pairs. The proton is shown to be analogous to a quantum vortex system of three neutral spin-1 vortices having 0.99656 of the total rest mass, plus a lighter charged component, These spin-1 vortices appear to have the rest mass of a neutral pion pair, With that assumption, the pi(0)-to-proton mass ratio is derived as In (4/3)/2, from which the pi(0) mass of 134.9621 +/- 0.0004 MeV is found. Predicted tensions inside the proton from the strong force and from the electromagnetic force are 492.306 MeV/fm and 3.5925 MeV/fm, from which the neutron-proton mass difference of + 1.2937 MeV is obtained, The Lamb-Chaplygin vortex dipole is shown to be the basis for the D mesons, The D-0 is predicted to have a radius of 0.4310 fm. The K+/- mass is found to be 493.6959 +/- 0.0002 MeV based on the predicted ratio: K+/-/m(p) = 0.52617551. The quantum vortex content and pole masses Of many baryon states are proposed and related to their production and decay. Rules governing particle formation are proposed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Olson, AP (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU PHYSICS ESSAYS PUBLICATION PI HULL PA C/O ALFT INC, 189 DEVEAULT ST, UNIT NO. 7, HULL, PQ J8Z1S7, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD DEC PY 1997 VL 10 IS 4 BP 586 EP 607 PG 22 WC Physics, Multidisciplinary SC Physics GA YU019 UT WOS:000071671700008 ER PT J AU Kapila, AK Son, SF Bdzil, JB Menikoff, R Stewart, DS AF Kapila, AK Son, SF Bdzil, JB Menikoff, R Stewart, DS TI Two-phase modeling of DDT: Structure of the velocity-relaxation zone SO PHYSICS OF FLUIDS LA English DT Article ID MIXTURE THEORY; DETONATION AB The structure of the velocity relaxation zone in a hyperbolic, nonconservative, two-phase model is examined in the limit of large drag, and in the context of the problem of deflagration-to-detonation transition in a granular explosive. The primary motivation for the study is the desire to relate the end states across the relaxation zone, which can then be treated as a discontinuity in a reduced, equivelocity model, that is computationally more efficient than its parent. In contrast to a conservative system, where end states across thin zones of rapid variation are determined principally by algebraic statements of conservation, the nonconservative character of the present system requires an explicit consideration of the structure. Starting with the minimum admissible wave speed, the structure is mapped out as the wave speed increases. Several critical wave speeds corresponding to changes in the structure are identified. The archetypal structure is partly dispersed, monotonic, and involves conventional hydrodynamic shocks in one or both phases. The picture is reminiscent of, but more complex than, what is observed in such (simpler) two-phase media as a dusty gas. (C) 1997 American Institute of Physics. [S1070-6631(97)00312-7]. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV ILLINOIS,URBANA,IL 61801. RP Kapila, AK (reprint author), RENSSELAER POLYTECH INST,TROY,NY 12180, USA. OI Son, Steven/0000-0001-7498-2922 NR 13 TC 59 Z9 59 U1 0 U2 6 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 DEC PY 1997 VL 9 IS 12 BP 3885 EP 3897 DI 10.1063/1.869488 PG 13 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA YH897 UT WOS:A1997YH89700030 ER PT J AU Ghosal, S Rose, HA AF Ghosal, S Rose, HA TI Effect of induced spatial incoherence on flow induced laser beam deflection: Analytic theory SO PHYSICS OF PLASMAS LA English DT Article ID INERTIAL CONFINEMENT FUSION; RANDOM-PHASE PLATE; HOT-SPOTS; PLASMAS AB Analytic results are presented for the laser beam deflection rate in the case of spatial and temporal smoothing by induced spatial incoherence (ISI). It is shown that for flow perpendicular to the beam propagation direction with Mach number M, temporal smoothing decreases the beam deflection rate for M > 1, but may increase it for M < 1 and weak acoustic wave damping. (C) 1997 American Institute of Physics. C1 LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. RP Ghosal, S (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. RI Ghosal, Sandip/A-3534-2009; Ghosal, Sandip/B-7595-2009 OI Ghosal, Sandip/0000-0001-6587-3716; NR 17 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 DEC PY 1997 VL 4 IS 12 BP 4189 EP 4191 DI 10.1063/1.872609 PG 3 WC Physics, Fluids & Plasmas SC Physics GA YK919 UT WOS:A1997YK91900001 ER PT J AU Elisseev, VV Ourdev, I Rozmus, W Tikhonchuk, VT Capjack, CE Young, PE AF Elisseev, VV Ourdev, I Rozmus, W Tikhonchuk, VT Capjack, CE Young, PE TI Ion wave response to intense laser beams in underdense plasmas SO PHYSICS OF PLASMAS LA English DT Article ID STIMULATED BRILLOUIN-SCATTERING; CHANNEL FORMATION; HOT-SPOT; FILAMENTATION; LIGHT AB Numerical and theoretical studies of laser beam interaction with underdense plasmas involving ion wave instabilities are presented. The theoretical model that is used involves realistic distribution of laser intensity in a focal spot and a non-paraxial electromagnetic wave equation coupled to the ion acoustic wave equation in a two-dimensional geometry. Included among the important results is a weak correlation between backscattered stimulated Brillouin scattering (SBS) reflectivity and filamentation or self-focusing instabilities. The transmitted Light demonstrates angular spreading and frequency shifts consistent with near-forward SBS. The role of filamentation and self-focusing on the transmitted light is also discussed. (C) 1997 American Institute of Physics. C1 UNIV ALBERTA,DEPT ELECT ENGN,EDMONTON,AB T6G 2G7,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP Elisseev, VV (reprint author), UNIV ALBERTA,INST THEORET PHYS,DEPT PHYS,EDMONTON,AB T6G 2J1,CANADA. NR 27 TC 21 Z9 21 U1 1 U2 2 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 DEC PY 1997 VL 4 IS 12 BP 4333 EP 4346 DI 10.1063/1.872596 PG 14 WC Physics, Fluids & Plasmas SC Physics GA YK919 UT WOS:A1997YK91900021 ER PT J AU Dimonte, G Schneider, M AF Dimonte, G Schneider, M TI Turbulent Richtmyer-Meshkov instability experiments with strong radiatively driven shocks SO PHYSICS OF PLASMAS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; INERTIAL CONFINEMENT FUSION; NUMERICAL-SIMULATION; SINGLE-MODE; SCALE PERTURBATIONS; LASER; INTERFACE; NOVA; COMPRESSION; DIMENSIONS AB The Richtmyer-Meshkov instability is investigated in the turbulent regime with strong radiatively driven shocks (Mach >10) on the Nova laser [Phys. Rev. Lett. 70, 1806 (1993)]. The targets are planar with near solid density and Atwood number similar to-0.9. The interfacial perturbations are three dimensional (3-D), random, and nonlinear with a broad scale distribution such that they develop into a turbulent mixing zone (TMZ). The TMZ is diagnosed radiographically using x-ray dopants localized to the center of the target to avoid edge effects. Two different diagnostic configurations yield comparable results. The total width of the TMZ is found to increase in time as H similar to t(Theta), with Theta similar to 0.51+/-0.1. When compared to shock tube data, this result supports the suggestion [Phys. Fluids 8, 614 (1996)] that Theta decreases with Mach number. The data are used to test turbulence models and to determine the effective drag coefficient C-d similar to 2.61+/-1.2 for potential how mix models in the high compression regime. (C) 1997 American Institute of Physics. RP Dimonte, G (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 69 TC 30 Z9 31 U1 1 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 DEC PY 1997 VL 4 IS 12 BP 4347 EP 4357 DI 10.1063/1.872597 PG 11 WC Physics, Fluids & Plasmas SC Physics GA YK919 UT WOS:A1997YK91900022 ER PT J AU Yukhimuk, V RousselDupre, R AF Yukhimuk, V RousselDupre, R TI Magnetic field pulses produced via whistler mode wave decay in the ionosphere SO PHYSICS OF PLASMAS LA English DT Article ID DE-1 AB The nonlinear ionospheric effects of very low-frequency (VLF) electromagnetic radiation produced by lightning discharges are considered. Electric and magnetic field measurements by a rocket in the ionosphere reported by Kelly et al [Geophys. Res. Lett. 17, 2221 (1990)] show the simultaneous presence of powerful electromagnetic whistler wave bursts along with electrostatic waves and a magnetic pulse with duration about 20 ms. The parametric decay of whistler mode waves into electrostatic waves and ultralow-freuency (ULF) electromagnetic waves is proposed as a possible explanation for the observed phenomenon. The evolution of whistler mode wave decay instabilities in time and two spatial dimensions is studied. The nonlinear dispersion equation is obtained, and solved numerically. Two-fluid magnetohydrodynamics is used to described the three-wave interaction. The theoretical results are observational data. RP Yukhimuk, V (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MS D466,LOS ALAMOS,NM 87545, USA. NR 19 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD DEC PY 1997 VL 4 IS 12 BP 4388 EP 4393 DI 10.1063/1.872601 PG 6 WC Physics, Fluids & Plasmas SC Physics GA YK919 UT WOS:A1997YK91900026 ER PT J AU Riordan, M Hoddeson, L AF Riordan, M Hoddeson, L TI The moses of Silicon Valley SO PHYSICS TODAY LA English DT Article C1 UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV ILLINOIS,URBANA,IL 61801. RP Riordan, M (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 15 TC 1 Z9 1 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1997 VL 50 IS 12 BP 42 EP 47 DI 10.1063/1.881629 PG 6 WC Physics, Multidisciplinary SC Physics GA YJ169 UT WOS:A1997YJ16900011 ER PT J AU Diamond, RM AF Diamond, RM TI Obituary Earl K. Hyde SO PHYSICS TODAY LA English DT Item About an Individual RP Diamond, RM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1997 VL 50 IS 12 BP 91 EP 92 DI 10.1063/1.882037 PG 2 WC Physics, Multidisciplinary SC Physics GA YJ169 UT WOS:A1997YJ16900026 ER PT J AU Saltmarsh, MJ Berry, LA AF Saltmarsh, MJ Berry, LA TI Obituary O.B. ''Bill'' Morgan SO PHYSICS TODAY LA English DT Item About an Individual RP Saltmarsh, MJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1997 VL 50 IS 12 BP 93 EP 93 DI 10.1063/1.882039 PG 1 WC Physics, Multidisciplinary SC Physics GA YJ169 UT WOS:A1997YJ16900028 ER PT J AU Bond, P AF Bond, P TI BNL official explains sources and handling of tritium leaks SO PHYSICS TODAY LA English DT Letter RP Bond, P (reprint author), BROOKHAVEN NATL LAB,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 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1997 VL 50 IS 12 BP 95 EP 95 DI 10.1063/1.882047 PG 1 WC Physics, Multidisciplinary SC Physics GA YJ169 UT WOS:A1997YJ16900030 ER PT J AU Nevins, B AF Nevins, B TI Stark choice for tokamaks SO PHYSICS WORLD LA English DT Article C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Nevins, B (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8585 J9 PHYS WORLD JI Phys. World PD DEC PY 1997 VL 10 IS 12 BP 24 EP 25 PG 2 WC Physics, Multidisciplinary SC Physics GA YM419 UT WOS:000071061600022 ER PT J AU Albrow, M AF Albrow, M TI Seeing particles SO PHYSICS WORLD LA English DT Editorial Material C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Albrow, M (reprint author), Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8585 J9 PHYS WORLD JI Phys. World PD DEC PY 1997 VL 10 IS 12 BP 84 EP 84 PG 1 WC Physics, Multidisciplinary SC Physics GA YM419 UT WOS:000071061600039 ER PT J AU Adams, JM Ageladarakis, P Arshad, SA Alper, B Altmann, H Andrew, P Bailey, D Bainbridge, N Balet, B Baranov, Y Barker, P Barnsley, R Baronian, M Bartlett, DV Bell, AC Bertolini, E Bhatnagar, V Bickley, AJ Bindslev, H Blackler, K Bond, D Bonicelli, T Borba, D Brandon, M Breger, P Brelen, H Brennan, P Brewerton, WJ Browne, ML Budd, T Burt, A Businaro, T Buzio, M Caldwell-Nichols, C Campling, D Card, P Challis, CD Chankin, AV Chiron, D Christiansen, J Chuilon, P Ciric, D Claesen, R Clarke, HE Clement, S Coad, JP Coffey, I Conroy, S Conway, G Cooper, S Cordey, JG Corrigan, G Cottrell, G Cox, M Cox, SJ Cusack, R Davies, N Davies, SJ Davis, JJ de Benedetti, M de Esch, H de Haas, J Deksnis, E Deliyanakis, N Dines, A Dmitrenko, SL Dobbing, J Dolgetta, N Dorling, SE Dorr, J Doyle, PG Duquenoy, H Edwards, AM Edwards, AW Egedal, J Ehrenberg, J Ekedahl, A Elevant, T Ellis, J Endler, M Erents, SK Ericsson, S Esposito, B Eriksson, LG Falter, H Farthing, JW Fasoli, A Fichtmuller, M Fischer, B Fishpool, G Fullard, K Gadeberg, M Galbiati, L Giannella, R Gibson, A Gill, RD Godden, D Gondhalekar, A Goodall, D Gormezano, C Gowers, C Guenther, K Guo, H Haigh, A Haist, B Hancock, CJ Harbour, PJ Hawkes, NC Hawkes, NP Hemmerich, JL Hender, T Hoekzema, J Horton, L How, J Howman, A Huart, M Hughes, TP Hurd, F Huysmans, G Ingesson, C Ingram, B Irving, M Jacquinot, J Jaeckel, H Jaeger, JF Jarvis, ON Jensen, F Johnson, M Jones, EM Jones, TTC Junger, JF Junique, F Kaye, A Keen, BE Keilhacker, M Kerner, W Kidd, NG Knipe, S Konig, R Krom, JG Kupschus, P Lasser, R Last, JR Lauro-Taroni, L Lawson, K Lennholm, M Lingertat, J Lomas, PJ Loughlin, M Lovegrove, T Lowry, C Maas, AC Macklin, B Maggi, CF Mantsinen, M Marchese, V Marcus, F Mart, J Martin, D Matthews, G McBryan, H McCracken, G McCullen, PA Meigs, A Middleton, R Miele, P Milani, F Mills, J Mohanti, R Monk, R Morgan, P Murphy, G Nave, F Newbert, G Nielsen, P Noll, P Obert, W O'Brien, D Oord, E Ostrom, R Ottaviani, M Papastergiou, S Parail, VV Parkinson, R Parsons, W Patel, B Paynter, A Perevezentsev, A Peacock, A Peacock, N Pearce, RJH Perry, C Pick, MA Plancoulaine, J Pogutse, O Prentice, R Puppin, S Radford, G Reichle, R Riccardo, V Righi, E Rimini, F Rolfe, A Roquemore, L Ross, RT Rossi, A Rossi, L Sadler, G Saibene, G Salisbury, M Santagiustina, A Sartori, F Saunders, R Schild, P Schmid, M Schmidt, V Schokker, B Schunke, B Scibile, L Scott, SM Sharapov, S Sibley, A Simonini, R Sips, ACC Smeulders, P Smith, P Smith, R Soldner, F Spence, J Springmann, E Stagg, R Stamp, M Stangeby, P Start, DF Stork, D Stott, PE Strachen, P Stubberfield, P Summers, D Svensson, L Svensson, P Tabasso, A Tabellini, M Tait, J Tanga, A Taroni, A Terella, C Thomas, PR Thomsen, K Traneus, E Tubbing, B Twyman, P Ul'Haq, Y Vadgama, A van Belle, P van der Linden, R Vlases, GC von Hellermann, M Wade, T Walton, R Ward, D Watkins, ML Watkins, N Watson, MJ Wheatley, M Wilson, D Winkel, T Young, D Young, ID Yu, Q Zastrow, KD Zhang, W Zornig, N Zwingmann, W AF Adams, JM Ageladarakis, P Arshad, SA Alper, B Altmann, H Andrew, P Bailey, D Bainbridge, N Balet, B Baranov, Y Barker, P Barnsley, R Baronian, M Bartlett, DV Bell, AC Bertolini, E Bhatnagar, V Bickley, AJ Bindslev, H Blackler, K Bond, D Bonicelli, T Borba, D Brandon, M Breger, P Brelen, H Brennan, P Brewerton, WJ Browne, ML Budd, T Burt, A Businaro, T Buzio, M Caldwell-Nichols, C Campling, D Card, P Challis, CD Chankin, AV Chiron, D Christiansen, J Chuilon, P Ciric, D Claesen, R Clarke, HE Clement, S Coad, JP Coffey, I Conroy, S Conway, G Cooper, S Cordey, JG Corrigan, G Cottrell, G Cox, M Cox, SJ Cusack, R Davies, N Davies, SJ Davis, JJ de Benedetti, M de Esch, H de Haas, J Deksnis, E Deliyanakis, N Dines, A Dmitrenko, SL Dobbing, J Dolgetta, N Dorling, SE Dorr, J Doyle, PG Duquenoy, H Edwards, AM Edwards, AW Egedal, J Ehrenberg, J Ekedahl, A Elevant, T Ellis, J Endler, M Erents, SK Ericsson, S Esposito, B Eriksson, LG Falter, H Farthing, JW Fasoli, A Fichtmuller, M Fischer, B Fishpool, G Fullard, K Gadeberg, M Galbiati, L Giannella, R Gibson, A Gill, RD Godden, D Gondhalekar, A Goodall, D Gormezano, C Gowers, C Guenther, K Guo, H Haigh, A Haist, B Hancock, CJ Harbour, PJ Hawkes, NC Hawkes, NP Hemmerich, JL Hender, T Hoekzema, J Horton, L How, J Howman, A Huart, M Hughes, TP Hurd, F Huysmans, G Ingesson, C Ingram, B Irving, M Jacquinot, J Jaeckel, H Jaeger, JF Jarvis, ON Jensen, F Johnson, M Jones, EM Jones, TTC Junger, JF Junique, F Kaye, A Keen, BE Keilhacker, M Kerner, W Kidd, NG Knipe, S Konig, R Krom, JG Kupschus, P Lasser, R Last, JR Lauro-Taroni, L Lawson, K Lennholm, M Lingertat, J Lomas, PJ Loughlin, M Lovegrove, T Lowry, C Maas, AC Macklin, B Maggi, CF Mantsinen, M Marchese, V Marcus, F Mart, J Martin, D Matthews, G McBryan, H McCracken, G McCullen, PA Meigs, A Middleton, R Miele, P Milani, F Mills, J Mohanti, R Monk, R Morgan, P Murphy, G Nave, F Newbert, G Nielsen, P Noll, P Obert, W O'Brien, D Oord, E Ostrom, R Ottaviani, M Papastergiou, S Parail, VV Parkinson, R Parsons, W Patel, B Paynter, A Perevezentsev, A Peacock, A Peacock, N Pearce, RJH Perry, C Pick, MA Plancoulaine, J Pogutse, O Prentice, R Puppin, S Radford, G Reichle, R Riccardo, V Righi, E Rimini, F Rolfe, A Roquemore, L Ross, RT Rossi, A Rossi, L Sadler, G Saibene, G Salisbury, M Santagiustina, A Sartori, F Saunders, R Schild, P Schmid, M Schmidt, V Schokker, B Schunke, B Scibile, L Scott, SM Sharapov, S Sibley, A Simonini, R Sips, ACC Smeulders, P Smith, P Smith, R Soldner, F Spence, J Springmann, E Stagg, R Stamp, M Stangeby, P Start, DF Stork, D Stott, PE Strachen, P Stubberfield, P Summers, D Svensson, L Svensson, P Tabasso, A Tabellini, M Tait, J Tanga, A Taroni, A Terella, C Thomas, PR Thomsen, K Traneus, E Tubbing, B Twyman, P Ul'Haq, Y Vadgama, A van Belle, P van der Linden, R Vlases, GC von Hellermann, M Wade, T Walton, R Ward, D Watkins, ML Watkins, N Watson, MJ Wheatley, M Wilson, D Winkel, T Young, D Young, ID Yu, Q Zastrow, KD Zhang, W Zornig, N Zwingmann, W CA JET Team TI Latest JET results in deuterium and deuterium-tritium plasmas SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 24th European-Physical-Society Conference on Controlled Fusion and Plasma Physics CY JUN 09-13, 1997 CL BERCHTESGADEN, GERMANY SP European Phys Soc, Plasma Phys Div, Max Planck Inst Plasmaphys AB All major JET systems have been fully commissioned for D-T and the DTE1 series of experiments has started with the D-T fuel mixture and operating conditions foreseen for ITER. In the area of ITER physics, significant results have been produced in both D-D and D-T. In D-D, the LH threshold power database has been extended, the bounds on edge-electron temperature and density in ELMy H-modes have been defined and the advantages of Types I and III ELMy discharges have been compared. In D-T plasmas, the isotope effect on H-mode threshold power and transport has been determined so that a more accurate assessment can be made of the ignition margin and heating requirements for ITER. Trace tritium experiments have provided first particle transport measurements and an assessment of the ITER reference ion-cyclotron resonance-frequency heating scenarios has been started, In the area of fusion performance, record D-D neutron yields have been obtained by controlling the plasma and current profiles in hot ion ELM-free H-modes and optimized shear modes. In D-T, internal transport barriers have been readily established in optimized shear discharges and Alfven eigenmodes have been observed. C1 Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England. UKAEA, Didcot, Oxon, England. Univ Leicester, Leicester, Leics, England. FZK, Karlsruhe, Germany. Forschungszentrum Julich, D-5170 Julich, Germany. Aalto Univ, FIN-02150 Espoo, Finland. Acad Sinica, Inst Plasma Phys, Hefei 230031, Peoples R China. UKAEA, Culham Lab, Abingdon OX14 3DB, Oxon, England. Univ Oxford, Inst Theoret Phys, Oxford OX1 2JD, England. ENEA, CRE Frascati, Rome, Italy. Royal Inst Technol, S-10044 Stockholm, Sweden. Univ London Imperial Coll Sci Technol & Med, London, England. EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. FOM, Inst Plasmafys, Nieuwegein, Netherlands. Uppsala Univ, Stredburg Lab, S-75105 Uppsala, Sweden. Univ Saskatchewan, Saskatoon, SK, Canada. Ecole Polytech Fed Lausanne, Lausanne, Switzerland. IST, Ctr Fuseo Nucl, Lisbon, Portugal. Univ Toronto, Inst Aerosp Studies, Toronto, ON, Canada. AF Ioffe Inst, St Petersburg, Russia. RP Adams, JM (reprint author), Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England. RI Nave, Maria/A-5581-2013 OI Nave, Maria/0000-0003-2078-6584 NR 18 TC 23 Z9 23 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1997 VL 39 SU 12B BP B1 EP B18 PG 18 WC Physics, Fluids & Plasmas SC Physics GA YU064 UT WOS:000071677500002 ER PT J AU Fasoli, A Borba, D Gormezano, C Heeter, R Jaun, A Jacquinot, J Kerner, W King, Q Lister, JB Sharapov, S Start, D Villard, L AF Fasoli, A Borba, D Gormezano, C Heeter, R Jaun, A Jacquinot, J Kerner, W King, Q Lister, JB Sharapov, S Start, D Villard, L TI Alfven eigenmode experiments in tokamaks and stellarators SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 24th European-Physical-Society Conference on Controlled Fusion and Plasma Physics CY JUN 09-13, 1997 CL BERCHTESGADEN, GERMANY SP European Phys Soc, Plasma Phys Div, Max Planck Inst Plasmaphys ID TFTR; INSTABILITIES; EXCITATION; WAVES AB In tokamaks and stellarators, measurements of electromagnetic fluctuations in the presence of resonant particle drive, including fusion-produced alpha's, reveal the excitation of Alfven eigenmodes (AE), related under certain conditions to a degradation in the fast-particle confinement. The balance between the drive and the background damping is investigated using active diagnostic systems to excite and measure the AE spectrum in terms of frequencies and damping rates. At JET, saddle-coil antennae drive low toroidal mode number (n < 4) AE in the range 30-500 kHz, including toroidal AE, kinetic AE, elliptical AE and global AE. Conditions for weak damping (gamma/omega(damp) < 1%) are identified. Low-n AE appear to be strongly damped (gamma/omega(damp) > 1%) during the creation of the magnetic X-point. In the presence of resonant fast particles, information on the instability drive is obtained: low-n modes are found to be stable in the presence of NBI with upsilon(parallel to)/upsilon(A) < 1. Fast ions generated by ICRH are observed to produce a drive for 4(ICRH) > P-thresh, with 2.5 MW < P-thresh < 5 MW; under these conditions, intrinsically driven TAE and EAE are clearly observed in the magnetic fluctuation spectra, with no measurable effect on the plasma performance. C1 Assoc Euratom Confederat Suisse, CRPP ERFL, CH-1015 Lausanne, Switzerland. Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England. Inst Super Tecn, EURATOM Assoc, P-1096 Lisbon, Portugal. Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Alfven Lab, Stockholm, Sweden. RP Fasoli, A (reprint author), Assoc Euratom Confederat Suisse, CRPP ERFL, CH-1015 Lausanne, Switzerland. NR 32 TC 51 Z9 51 U1 1 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1997 VL 39 SU 12B BP B287 EP B301 DI 10.1088/0741-3335/39/12B/022 PG 15 WC Physics, Fluids & Plasmas SC Physics GA YU064 UT WOS:000071677500022 ER PT J AU Strachan, JD Batha, S Beer, M Bell, MG Bell, RE Belov, A Berk, H Bernabei, S Bitter, M Breizman, B Bretz, NL Budny, R Bush, CE Callen, J Cauffman, S Chang, CS Chang, Z Cheng, CZ Darrow, DS Dendy, RO Dorland, W Duong, H Efthimion, PC Ernst, D Evenson, H Fisch, NJ Fisher, R Fonck, RJ Fredrickson, ED Fu, GY Furth, HP Gorelenkov, NN Goloborod'ko, VY Grek, B Grisham, LR Hammett, GW Hawryluk, RJ Heidbrink, W Herrmann, HW Herrmann, MC Hill, KW Hogan, J Hooper, B Hosea, JC Houlberg, WA Hughes, M Jassby, DL Jobes, FC Johnson, DW Kaita, R Kaye, S Kesner, J Kim, JS Kissick, M Krasilnikov, AV Kugel, H Kumar, A Lam, NT Lamarche, P Leblanc, B Levinton, FM Ludescher, C Machuzak, J Majeski, RP Manickam, J Mansfield, DK Mauel, M Mazzucato, E McChesney, J McCune, DC McKee, G McGuire, KM Meade, DM Medley, SS Mikkelsen, DR Mirnov, SV Mueller, D Nagayama, Y Navratil, GA Nazikian, R Okabayashi, M Osakabe, M Owens, DK Park, HK Park, W Paul, SF Petrov, MP Phillips, M Phillips, P Ramsey, AT Rice, B Redi, MH Rewoldt, G Reznik, S Roquemore, AL Rogers, J Ruskov, E Sabbagh, SA Sasao, M Schilling, G Schmidt, GL Scott, SD Semenov, I Senko, T Skinner, CH Stevenson, T Strait, EJ Stratton, BC Stodiek, W Synakowski, E Takahashi, H Tang, W Taylor, G Thompson, ME von Goeler, S von Halle, A Walters, RT Wang, S White, R Wieland, RM Williams, M Wilson, JR Wong, KL Wurden, GA Yamada, M Yavorski, V Young, KM Zakharov, L Zarnstorff, MC Zweben, SJ AF Strachan, JD Batha, S Beer, M Bell, MG Bell, RE Belov, A Berk, H Bernabei, S Bitter, M Breizman, B Bretz, NL Budny, R Bush, CE Callen, J Cauffman, S Chang, CS Chang, Z Cheng, CZ Darrow, DS Dendy, RO Dorland, W Duong, H Efthimion, PC Ernst, D Evenson, H Fisch, NJ Fisher, R Fonck, RJ Fredrickson, ED Fu, GY Furth, HP Gorelenkov, NN Goloborod'ko, VY Grek, B Grisham, LR Hammett, GW Hawryluk, RJ Heidbrink, W Herrmann, HW Herrmann, MC Hill, KW Hogan, J Hooper, B Hosea, JC Houlberg, WA Hughes, M Jassby, DL Jobes, FC Johnson, DW Kaita, R Kaye, S Kesner, J Kim, JS Kissick, M Krasilnikov, AV Kugel, H Kumar, A Lam, NT Lamarche, P Leblanc, B Levinton, FM Ludescher, C Machuzak, J Majeski, RP Manickam, J Mansfield, DK Mauel, M Mazzucato, E McChesney, J McCune, DC McKee, G McGuire, KM Meade, DM Medley, SS Mikkelsen, DR Mirnov, SV Mueller, D Nagayama, Y Navratil, GA Nazikian, R Okabayashi, M Osakabe, M Owens, DK Park, HK Park, W Paul, SF Petrov, MP Phillips, M Phillips, P Ramsey, AT Rice, B Redi, MH Rewoldt, G Reznik, S Roquemore, AL Rogers, J Ruskov, E Sabbagh, SA Sasao, M Schilling, G Schmidt, GL Scott, SD Semenov, I Senko, T Skinner, CH Stevenson, T Strait, EJ Stratton, BC Stodiek, W Synakowski, E Takahashi, H Tang, W Taylor, G Thompson, ME von Goeler, S von Halle, A Walters, RT Wang, S White, R Wieland, RM Williams, M Wilson, JR Wong, KL Wurden, GA Yamada, M Yavorski, V Young, KM Zakharov, L Zarnstorff, MC Zweben, SJ TI TFTR DT experiments SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 24th European-Physical-Society Conference on Controlled Fusion and Plasma Physics CY JUN 09-13, 1997 CL BERCHTESGADEN, GERMANY SP European Phys Soc, Plasma Phys Div, Max Planck Inst Plasmaphys ID TRITIUM TOKAMAK PLASMA; CONFINED ALPHAS; DEUTERIUM; DETECTORS AB The Tokamak Fusion Test Reactor (TFTR) is a large tokamak which has performed experiments with 50:50 deuterium-tritium fuelled plasmas. Since 1993, TFTR has produced about 1090 D-T plasmas using about 100 grams of tritium and producing about 1.6 GJ of D-T fusion energy. These plasmas have significant populations of 3.5 MeV alphas (the charged D-T fusion product). TFTR research has focused on alpha particle confinement, alpha driven modes, and alpha heating studies. Maximum D-T fusion power production has aided these studies, requiring simultaneously operation at high input heating power and large energy confinement time (to produce the highest temperature and density), while maintaining low impurity content. The principal limitation to the TFTR fusion power production was the disruptive stability limit. Secondary limitations were the confinement time, and limiter power handling capability. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. Fus Phys & Technol, Torrance, CA USA. Troitsk Inst Innovat & Thermonucl Res, Moscow, Russia. Univ Texas, Inst Fus Studies, Austin, TX 78712 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Univ Wisconsin, Madison, WI USA. NYU, Courant Inst, New York, NY USA. UKAEA, Culham Lab, Abingdon OX14 3DB, Oxon, England. Gen Atom Co, San Diego, CA USA. MIT, Cambridge, MA 02139 USA. Ukrainian Inst Nucl Res, Kiev, Ukraine. Univ Calif Irvine, Irvine, CA 92717 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. Northrop Grumman Corp, Princeton, NJ USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Columbia Univ, New York, NY USA. Natl Inst Fus Sci, Nagoya, Aichi, Japan. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. RP Strachan, JD (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; Dendy, Richard/A-4533-2009; Dorland, William/B-4403-2009; White, Roscoe/D-1773-2013; Cheng, Chio/K-1005-2014; Yamada, Masaaki/D-7824-2015; Wurden, Glen/A-1921-2017; Wang, Shaojie/A-2675-2017 OI Hammett, Gregory/0000-0003-1495-6647; Ernst, Darin/0000-0002-9577-2809; Dorland, William/0000-0003-2915-724X; White, Roscoe/0000-0002-4239-2685; Yamada, Masaaki/0000-0003-4996-1649; Wurden, Glen/0000-0003-2991-1484; Wang, Shaojie/0000-0002-2786-519X NR 21 TC 17 Z9 17 U1 0 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1997 VL 39 SU 12B BP B103 EP B114 DI 10.1088/0741-3335/39/12B/008 PG 12 WC Physics, Fluids & Plasmas SC Physics GA YU064 UT WOS:000071677500008 ER PT J AU DiBari, G Dini, J AF DiBari, G Dini, J TI Unusual electroforming accomplishments SO PLATING AND SURFACE FINISHING LA English DT Article C1 LAWRENCE LIVERMORE NATL LAB,MAT FABRICAT DIV,LIVERMORE,CA. RP DiBari, G (reprint author), NICKEL PLATIN PRODUCTS,INCO,PARK 80 W,PLAZA 2,SADDLEBROOK,NJ 07662, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD DEC PY 1997 VL 84 IS 12 BP 20 EP 21 PG 2 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA YK099 UT WOS:A1997YK09900005 ER PT J AU Bonivert, WD Cushnie, G AF Bonivert, WD Cushnie, G TI Technical database is a popular feature SO PLATING AND SURFACE FINISHING LA English DT News Item C1 CAI ENGN,OAKTON,VA 22124. RP Bonivert, WD (reprint author), SANDIA NATL LABS,M-S 9404,BOX 969,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD DEC PY 1997 VL 84 IS 12 BP 58 EP 59 PG 2 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA YK099 UT WOS:A1997YK09900017 ER PT J AU Dini, JW Morrissey, RJ Pacheco, DR AF Dini, JW Morrissey, RJ Pacheco, DR TI Materials characterization of a non-cyanide silver electrodeposit SO PLATING AND SURFACE FINISHING LA English DT Article ID ELECTROLESS COPPER-DEPOSITS; FILMS; NICKEL; ALLOYS; MICROSTRUCTURE; MICROPOROSITY; DUCTILITY; CHROMIUM; HYDROGEN AB This paper presents results of a CRADA (Cooperative Research and Development Agreement) between Technic, Inc., and the Lawrence Livermore National Laboratory, directed at developing a non-cyanide plating solution for deposition of thick (>125 mu m) deposits, Results were quite successful with a succinimide-based formulation, Data are included on grain size (transmission electron microscopy), hardness, electrical resistivity, ductility, stress and wear. C1 TECHNIC INC,PROVIDENCE,RI. LAWRENCE LIVERMORE NATL LAB,CHEM & ELECTROCHEM PROC LAB,LIVERMORE,CA. NR 44 TC 4 Z9 9 U1 2 U2 6 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD DEC PY 1997 VL 84 IS 12 BP 62 EP 67 PG 6 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA YK099 UT WOS:A1997YK09900019 ER PT J AU Chen, W Pyda, M Habenschuss, A Londono, JD Wunderlich, B AF Chen, W Pyda, M Habenschuss, A Londono, JD Wunderlich, B TI Nanophase separation and crystallization in PEIM-12 poly(4,4 '-phthaloimidobenzoyl-dodecamethyleneoxycarbonyl) SO POLYMERS FOR ADVANCED TECHNOLOGIES LA English DT Article DE poly(4,4 '-phthaloimidobenzoyl-dodecamethyleneoxycarbonyl); C-13-NMR; wide-angle X-ray diffraction; neutron scattering; mesophases; nanophases; polymorphism; conformational disorder; amphiphilic liquid crystal; thermotropic liquid crystal; condis crystal ID HEAT-CAPACITY MEASUREMENTS; C-13 NMR; POLY(ESTER IMIDE)S; LAYER STRUCTURES; CHAIN PACKING; TRANSITIONS; POLYIMIDES; SPACERS AB Nanophase separated poly(4,4'-phthaloimidobenzoyl-dodecamethyleneoxycarbonyl) (PEIM-12) is studied by solid-state C-13-NMR (nuclear magnetic resonance), differential scanning calorimetry and X-ray and neutron diffraction techniques. On cooling from the melt, PEIM-12 shows a layer structure that has been described in the literature either as a nanophase-separated material or a monotropic, thermotropic liquid crystal. Further crystallization leads to two possible crystalline phases (I and II). The Mew measurements reveal a biphasic behavior below the thermal transition temperatures. The lamellar superstructure is shown by neutron and X-ray scattering to be largely independent of the crystals and may even exist above the melting point. The two crystal forms are shown by NMR to differ in conformational ordering in the flexible spacers. Crystal II possesses conformational order in the center of the flexible spacer, while crystal I shows order at the ends. Sufficient conformational disorder remains, however, in both crystals, to make them condis crystals, short for conformationally disordered crystals. Calorimetry agrees with the measured entropies of disordering. The disagreement between the earlier analyses is eliminated by assuming that PEIM-12 is a special borderline liquid crystal former. Small changes in the structural order (head-to-head or head-to-tail) can change the behavior from that of a monotropic, thermotropic liquid crystal to an amphiphilic, nanophase-separated liquid crystal. (C) 1997 by John Wiley & Sons, Ltd. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 22 TC 15 Z9 15 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1042-7147 J9 POLYM ADVAN TECHNOL JI Polym. Adv. Technol. PD DEC PY 1997 VL 8 IS 12 BP 747 EP 760 DI 10.1002/(SICI)1099-1581(199712)8:12<747::AID-PAT711>3.3.CO;2-R PG 14 WC Polymer Science SC Polymer Science GA YQ839 UT WOS:000071428400002 ER PT J AU Finch, RJ Hawthorne, FC Miller, ML Ewing, RC AF Finch, RJ Hawthorne, FC Miller, ML Ewing, RC TI Distinguishing among schoepite, [(UO2)(8)O-2(OH)(12)](H2O)(12), and related minerals by X-ray powder diffraction SO POWDER DIFFRACTION LA English DT Article DE schoepite; metaschoepite; paraschoepite; uranyl oxide hydrate; calculated powder pattern ID CORROSION; URANINITE; FUEL AB We have calculated X-ray powder-diffraction data for schoepite, [(UO2)(8)O-2(OK)(12)](H2O)(12), using unit-cell and atomic parameters from the crystal structure (a 14.337, b 16.813, c 14.781, Z=4, Dx-4.87 g cm(-3). Schoepite crystallizes in space group P2(1)ca but is strongly pseudo-centrosymmetric, and observed reflections (I-rel>0.1%) conform to space group Pbca. The six strongest reflections for schoepite are [d(Angstrom), hkl (relative intensity)] 7.365, 002 (100), 3.253, 242 (55), 3.626, 240 (36), 3.223, 402 (25), 3.683, 004 (20), 2.584, 244 (18). The calculated intensities of reflections that distinguish space group Pbca from space group Pbna (the space group of metaschoepite), i.e., h01 with h odd and l even, are weak, and may not be evident in experimental powder patterns. The a axis of schoepite (14.34 Angstrom) is significantly longer than that of synthetic metaschoepite (13.98 Angstrom), and the two phases can best be distinguished by their unit-cell parameters. However, potential overlap of the strangest reflections can make identification and unit-cell determination difficult, especially for ne-grained material. Natural samples commonly contain intergrowths of schoepite, metaschoepite, and dehydrated schoepite. The calculated powder pattern for schoepite agrees well with data reported for natural schoepite (PDF 13-241) but shows discrepancies with the data from synthesis products. Data for "synthetic schoepite" indicate that this product was a mixture. Powder data labeled "paraschoepite" in the Powder Diffraction File do not correspond to the mineral of that name. (C) 1997 International Centre for Diffraction Data. C1 Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada. Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA. RP Finch, RJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Hawthorne, Frank/F-6864-2011; Finch, Robert/D-9553-2013 OI Hawthorne, Frank/0000-0001-6405-9931; Finch, Robert/0000-0001-9342-5574 NR 35 TC 10 Z9 10 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0885-7156 J9 POWDER DIFFR JI Powder Diffr. PD DEC PY 1997 VL 12 IS 4 BP 230 EP 238 PG 9 WC Materials Science, Characterization & Testing SC Materials Science GA YM411 UT WOS:000071060800004 ER PT J AU Zhu, YT Baldonado, PS Peterson, EJ Peterson, DE Mueller, FM AF Zhu, YT Baldonado, PS Peterson, EJ Peterson, DE Mueller, FM TI Powder diffraction data of SmBa4Cu3O8.5+delta SO POWDER DIFFRACTION LA English DT Article ID SYSTEM; SUPERCONDUCTIVITY AB Rietveld analysis of X-ray powder diffraction data was performed on SmBa4Cu3O8.5+delta, which was synthesized from precursors Sm2O3, BaO2, and CuO at 1000 degrees C in an oxygen atmosphere. SmBa4CuO8.5+delta has a cubic perovskite-related structure that is isostructural with YBa4Cu3O8.5+delta, and a doubled perovskite unit cell parameter of 8.177 90+/-0.000 04 Angstrom. (C) 1997 International Centre for Diffraction Data. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Zhu, YT (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS G755, Los Alamos, NM 87545 USA. RI Zhu, Yuntian/B-3021-2008 OI Zhu, Yuntian/0000-0002-5961-7422 NR 8 TC 4 Z9 4 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0885-7156 J9 POWDER DIFFR JI Powder Diffr. PD DEC PY 1997 VL 12 IS 4 BP 242 EP 244 PG 3 WC Materials Science, Characterization & Testing SC Materials Science GA YM411 UT WOS:000071060800006 ER PT J AU Bignozzi, CA Argazzi, R Indelli, MT Scandola, F Schoonover, JR Meyer, GJ AF Bignozzi, CA Argazzi, R Indelli, MT Scandola, F Schoonover, JR Meyer, GJ TI Intercomponent and interfacial electron transfer processes in polynuclear metal complexes anchored on transparent TiO2 films SO PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES LA English DT Article; Proceedings Paper CT Conference on Photochemical Conversion and Storage of Solar Energy CY JUL 28-AUG 02, 1996 CL INDIAN INST SCI, BANGALORE, INDIA HO INDIAN INST SCI DE polynuclear metal complexes; interfacial electron transfer studies; sensitizers; nanocrystalline TiO2 ID SPECTRAL SENSITIZATION; ENERGY-TRANSFER; CONVERSION; RUTHENIUM(II); LIGHT; SEMICONDUCTORS; SPECTROSCOPY; ELECTRICITY; MOLECULES AB A series of polynuclear complexes based on Ru-II, Os-II, Re-I and Rh-III polypyridine moieties have been prepared in the context of intramolecular energy and electron transfer studies and of interfacial electron transfer with nanocrystalline TiO2. The polynuclear complexes allow for the occurrence of vectorial intramolecular energy and electron transfer and have been proven to be efficient sensitizers of the wide band-gap semiconductor. The performance of photoregenerative cells based on these systems and the dynamics of the excited state intramolecular processes and of the interfacial electron transfer processes are discussed. C1 Univ Ferrara, Dipartimento Chim, I-44100 Ferrara, Italy. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Johns Hopkins Univ, Dept Chem, Baltimore, MD 21218 USA. RP Bignozzi, CA (reprint author), Univ Ferrara, Dipartimento Chim, Via L Borsari 46, I-44100 Ferrara, Italy. RI Indelli, Maria Teresa /F-9544-2015; Argazzi, Roberto/C-4819-2015; OI Indelli, Maria Teresa /0000-0002-8048-4441; Argazzi, Roberto/0000-0002-2619-6860; Bignozzi, Carlo Alberto/0000-0002-7882-3694 NR 35 TC 4 Z9 4 U1 0 U2 0 PU INDIAN ACAD SCIENCES PI BANGALORE PA C V RAMAN AVENUE, SADASHIVANAGAR, P B #8005, BANGALORE 560 080, INDIA SN 0253-4134 J9 P INDIAN AS-CHEM SCI JI Proc. Indian Acad. Sci.-Chem. Sci. PD DEC PY 1997 VL 109 IS 6 BP 397 EP 409 PG 13 WC Chemistry, Multidisciplinary SC Chemistry GA ZK445 UT WOS:000073321600005 ER PT J AU Pellegrini, M GronbechJensen, N Kelly, JA Pfluegl, GMU Yeates, TO AF Pellegrini, M GronbechJensen, N Kelly, JA Pfluegl, GMU Yeates, TO TI Highly constrained multiple-copy refinement of protein crystal structures SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE overdamped langevin dynamics; thermal motion; neurotrophin; glutamine synthetase; atomic displacement parameter; x-ray diffraction data; loop mobility; disorder ID UNADENYLYLATED GLUTAMINE-SYNTHETASE; RESTRAINED MOLECULAR-DYNAMICS; NERVE GROWTH-FACTOR; SALMONELLA-TYPHIMURIUM; THERMAL MOTION; DISORDER; CRYSTALLIZATION AB In the course of refining atomic protein structures, one often encounters difficulty with molecules that are unusually flexible or otherwise disordered. We approach the problem by combining two relatively recent developments: simultaneous refinement of multiple protein conformations and highly constrained refinement. A constrained Langevin dynamics refinement is tested on two proteins: neurotrophin-3 and glutamine synthetase, The method produces closer agreement between the calculated and observed scattering amplitudes than standard, single-copy, Gaussian atomic displacement parameter refinement. This is accomplished without significantly increasing the number of fitting parameters in the model, These results suggest that loop motion in proteins within a crystal lattice can be extensive and that it is poorly modeled by isotropic Gaussian distributions for each atom, (C) 1997 Wiley-Liss, Inc. C1 UNIV CALIF LOS ANGELES,INST MOL BIOL,LOS ANGELES,CA 90095. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM. OI Yeates, Todd/0000-0001-5709-9839 NR 24 TC 27 Z9 27 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-3585 J9 PROTEINS JI Proteins PD DEC PY 1997 VL 29 IS 4 BP 426 EP 432 DI 10.1002/(SICI)1097-0134(199712)29:4<426::AID-PROT3>3.0.CO;2-6 PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA YJ506 UT WOS:A1997YJ50600003 PM 9408940 ER PT J AU Geary, DL AF Geary, DL TI Consulting success using higher performance standards SO PUBLIC RELATIONS REVIEW LA English DT Book Review C1 US DOE, Washington, DC 20585 USA. RP Geary, DL (reprint author), US DOE, Washington, DC 20585 USA. NR 1 TC 0 Z9 0 U1 0 U2 2 PU JAI PRESS INC PI STAMFORD PA 100 PROSPECT ST, PO BOX 811, STAMFORD, CT 06901 USA SN 0363-8111 J9 PUBLIC RELAT REV JI Public Relat. Rev. PD WIN PY 1997 VL 23 IS 4 BP 421 EP 422 DI 10.1016/S0363-8111(97)90065-5 PG 2 WC Business; Communication SC Business & Economics; Communication GA YW541 UT WOS:000071946700017 ER PT J AU Marsh, SF Jarvinen, GD Kim, JS Nam, J Bartsch, RA AF Marsh, SF Jarvinen, GD Kim, JS Nam, J Bartsch, RA TI New bifunctional anion-exchange resins for nuclear waste treatment SO REACTIVE & FUNCTIONAL POLYMERS LA English DT Article DE anion exchange; resins; bifunctional; plutonium; nitric acid; nuclear waste ID NITRATE COMPLEXES; SPECTROSCOPY AB Several new types of bifunctional anion-exchange resin have been designed, synthesized, and tested for their ability to remove Pu(TV) from nitric acid. The functional group present in all of these resins is a pyridinium unit derived from the host poly(4-vinylpyridine) resin. Bifunctionality was achieved by adding a second anion-exchange site to the pyridine nitrogen via an alkylene spacer that encompassed ethylene through hexylene. The attached anion-exchange sites include trimethylammonium, pyridinium, and trimethylphosphonium. The sorption kinetics and distribution coefficients of Pu(IV) from 5 to 9 M nitric acid generally were best when the two anion-exchange sites were separated by a five-carbon spacer. The order of affinity for Pu(TV) from 7 M nitric acid was pyridinium>phosphonium>trimethylammonium. Replacing the central methylene unit in a five-carbon spacer with an ether-oxygen further enhanced the sorption of Pu(IV) onto the trimethylammonium-containing resin. Because these bifunctional resins are modifications of existing commercial Reillex(TM) resins, they are much easier to prepare than resins that require complete synthesis. We plan to evaluate these and related bifunctional resin structures for their ability to selectively remove other targeted anions from groundwater and industrial waste streams. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA. RP Marsh, SF (reprint author), Univ Calif Los Alamos Natl Lab, Mail Stop E510, Los Alamos, NM 87545 USA. RI Kim, Jong Seung/N-4504-2015 OI Kim, Jong Seung/0000-0003-3477-1172 NR 9 TC 15 Z9 16 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-5148 J9 REACT FUNCT POLYM JI React. Funct. Polym. PD DEC PY 1997 VL 35 IS 1-2 BP 75 EP 80 DI 10.1016/S1381-5148(97)00051-5 PG 6 WC Chemistry, Applied; Engineering, Chemical; Polymer Science SC Chemistry; Engineering; Polymer Science GA YN131 UT WOS:000071136200013 ER PT J AU Bradley, DJ Franck, CW Mikerin, Y AF Bradley, DJ Franck, CW Mikerin, Y TI Nuclear contamination in Siberia SO RECHERCHE LA French DT Article C1 DEPT ENERGIE ETATS UNIS,WASHINGTON,DC. MINIST ENERGIE ATOM FEDERAT RUSSE,DEPT SCI & TECHNOL,MOSCOW,RUSSIA. RP Bradley, DJ (reprint author), PACIFIC NW NATL LAB,RICHLAND,WA, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU SOC ED SCIENTIFIQUES PI PARIS 06 PA 57 RUE DE SEINE, 75280 PARIS 06, FRANCE SN 0029-5671 J9 RECHERCHE JI Recherche PD DEC PY 1997 IS 304 BP 56 EP 59 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YH832 UT WOS:A1997YH83200023 ER PT J AU Combs, SK Foust, CR AF Combs, SK Foust, CR TI New extruder-based deuterium feed system for centrifuge pellet injection SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID JOINT EUROPEAN TORUS AB The pellet injection systems for the next-generation fusion devices (such as the International Thermonuclear Experimental Reactor) and future fusion reactors will have to provide deuterium-tritium fueling for much loner pulse lengths (up to approximate to 1000 s) than present applications (typically limited to less than several seconds). Thus, a prototype pellet feed system for centrifuge pellet injection has been developed and used in long-pulse (> 100 s) tests at the Oak Ridge National Laboratory (ORNL). The new apparatus has two key components: (1) a cryogenic deuterium extruder and (2) an electromagnetic pellet punch mechanism. For maximum testing flexibility, the prototype is equipped with several other active components that allow remote adjustments, including precise positioning of the punch and the capability to index through eight different pellet lengths. The new feed system was designed to mate with an existing centrifuge accelerator facility at ORNL, and experiments in the facility were carried out to document the performance and reliability of the new feed system. With 2.3-mm-diam deuterium pellets and a catenary-shaped accelerator (approximate to 1.2 m diam), the prototype feed system was found to be capable of placing up to approximate to 90% of the punched pellets in the proper time/space window for pickup and acceleration by the high-speed rotating (approximate to 50 Hz) arbor. For these operating parameters, the pellet nominal speed was approximate to 430 m/s, and maximum pellet feed rates of 10 pellets/s and greater were tested. 18 this article the equipment is briefly described, and the experimental test results are summarized. Also, issues affecting overall pellet delivery efficiency are discussed. (C) 1997 American Institute of Physics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Combs, SK (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 14 TC 7 Z9 7 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1997 VL 68 IS 12 BP 4448 EP 4457 DI 10.1063/1.1148412 PG 10 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA YM344 UT WOS:000071054200022 ER PT J AU Gore, BF Dukelow, JS Mitts, TM Nicholson, WL AF Gore, BF Dukelow, JS Mitts, TM Nicholson, WL TI Conservatism of the Accident Sequence Evaluation Program HRA procedure SO RISK ANALYSIS LA English DT Article DE accident sequence evaluation program; ASEP; human reliability analysis; HRA; operator licensing examination; requalification examination; simulator examination AB This paper presents a limited assessment of the conservatism of the Accident Sequence Evaluation Program (ASEP) human reliability analysis (HRA) procedure described in NUREG/CR-4772. The data for this study are derived from simulator examination reports from the NRC requalification examination cycle for nuclear power plant operators. The ASEP procedure was used to estimate human error probability (HEP) values for critical tasks, and the HEP results were compared with the failure rates observed in the examinations. The ASEP procedure was applied by PNNL operator license examiners who supplemented the limited information in the examination reports with expert judgment based upon their extensive simulator examination experience. Comparison of the average of the ASEP HEP values with the fraction of the population actually failed and demonstrated that the ASEP HEP values are larger (conservative) by a statistically significant average factor of two. Partitioning of tasks into subgroups based on the ASEP HEP values and comparison of the subgroup average ASEP HEP values with observed subgroup failure rates showed little or no conservatism for small ASEP HEP values, but considerable conservatism for larger ASEP HEP values. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Gore, BF (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1997 VL 17 IS 6 BP 781 EP 787 DI 10.1111/j.1539-6924.1997.tb01283.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 YU635 UT WOS:000071738500011 ER PT J AU Touzet, CF AF Touzet, CF TI Neural reinforcement learning for behaviour synthesis SO ROBOTICS AND AUTONOMOUS SYSTEMS LA English DT Article DE neural Q-learning; reinforcement learning; obstacle avoidance behaviour; self-organising map; autonomous robotics ID AGENTS AB We present the results of a research aimed at improving the Q-learning method through the use of artificial neural networks. Neural implementations are interesting due to their generalisation ability. Two implementations are proposed: one with a competitive multilayer perceptron and the other with a self-organising map. Results obtained on a task of learning an obstacle avoidance behaviour for the mobile miniature robot Khepera show that this last implementation is very effective, learning more than 40 times faster than the basic Q-learning implementation. These neural implementations are also compared with several Q-learning enhancements, like the Q-learning with Hamming distance, Q-learning with statistical clustering and Dyna-Q. C1 Univ Aix Marseille 3, DIAM, IUSPIM, F-13397 Marseille 20, France. RP Touzet, CF (reprint author), Oak Ridge Natl Lab, Ctr Engn Syst Adv Res, POB 2008, Oak Ridge, TN 37831 USA. EM touzetc@mars.epm.ornl.gov NR 27 TC 63 Z9 66 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8890 J9 ROBOT AUTON SYST JI Robot. Auton. Syst. PD DEC PY 1997 VL 22 IS 3-4 BP 251 EP 281 DI 10.1016/S0921-8890(97)00042-0 PG 31 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Robotics SC Automation & Control Systems; Computer Science; Robotics GA YU687 UT WOS:000071744100006 ER PT J AU Gibson, EK McKay, DS ThomasKeprta, K Romanek, CS AF Gibson, EK McKay, DS ThomasKeprta, K Romanek, CS TI The case for relic life on Mars SO SCIENTIFIC AMERICAN LA English DT Article C1 UNIV CHICAGO,DEPT GEOL,CHICAGO,IL 60637. UNIV CHICAGO,SAVANNAH RIVER ECOL LAB,CHICAGO,IL 60637. RP Gibson, EK (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,EARTH SCI & SOLAR SYST EXPLORAT DIV,HOUSTON,TX 77058, USA. NR 6 TC 9 Z9 9 U1 0 U2 2 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD DEC PY 1997 VL 277 IS 6 BP 58 EP 65 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YG852 UT WOS:A1997YG85200025 PM 11536819 ER PT J AU Lemke, H Thomas, G AF Lemke, H Thomas, G TI Influence of small Cu additions on the microscopical magnetic properties of sintered Nd-Fe-B magnets SO SCRIPTA MATERIALIA LA English DT Article ID DIE-UPSET; COERCIVITY ENHANCEMENT; NDFEB MAGNETS; RICH PHASE; ELEMENTS; ALLOYS; PR C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP Lemke, H (reprint author), UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. NR 21 TC 5 Z9 5 U1 1 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD DEC 1 PY 1997 VL 37 IS 11 BP 1651 EP 1657 DI 10.1016/S1359-6462(97)00314-X PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YF880 UT WOS:A1997YF88000006 ER PT J AU Engler, O AF Engler, O TI Influence of particle stimulated nucleation on the recrystallization textures in cold deformed Al-alloys .2. Modeling of recrystallization textures SO SCRIPTA MATERIALIA LA English DT Article RP Engler, O (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,K765,LOS ALAMOS,NM 87545, USA. NR 12 TC 14 Z9 14 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD DEC 1 PY 1997 VL 37 IS 11 BP 1675 EP 1683 DI 10.1016/S1359-6462(97)00316-3 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YF880 UT WOS:A1997YF88000009 ER PT J AU Yang, X Johnson, S Shi, J Holesinger, T Swanson, B AF Yang, X Johnson, S Shi, J Holesinger, T Swanson, B TI Polyelectrolyte and molecular host ion self-assembly to multilayer thin films: An approach to thin film chemical sensors SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE polyelectrolyte; calixarene; self-assembly; thin-film Sensor ID CHARGED SURFACES; CONDUCTING POLYMERS; ADSORPTION; MICROSENSORS; RECOGNITION; MONOLAYERS; BUILDUP AB Multilayer molecular films of polyelectrolyte/calixarene and polyelectrolyte/cyclodextrin hosts were fabricated by alternating adsorption of charged species in aqueous solutions onto a substrate (quartz or silicon wafer). This layer-by-layer molecular deposition approach has been successfully used to integrate molecular recognition reagents into polymer films as chemically selective layers for surface acoustic wave (SAW) chemical sensing applications. The resulting sensors have high sensitivity and selectivity to the organic vapors studied. The films were characterized with SEM, infrared and W-vis spectroscopy, and monitored by SAW devices. These measurements revealed that the deposition process is highly reproducible and the resulting films are uniform and stable. (C) 1997 Elsevier Science S.A. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, CST-1,MS J565, Los Alamos, NM 87545 USA. NR 22 TC 56 Z9 61 U1 0 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD DEC 1 PY 1997 VL 45 IS 2 BP 87 EP 92 DI 10.1016/S0925-4005(97)00274-8 PG 6 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA YU804 UT WOS:000071756300001 ER PT J AU Mackenzie, PD AF Mackenzie, PD TI The random adversary: A lower-hound technique for randomized parallel algorithms SO SIAM JOURNAL ON COMPUTING LA English DT Article DE parallel algorithms; parallel computation; PRAM model; randomized parallel algorithms; expected time; lower bounds; load balancing ID RANDOM GRAPHS; TIME; BOUNDS; COMPUTATION; CIRCUITS; CYCLES; PRAMS; PATH AB The random-adversary technique is a general method for proving lower bounds on randomized parallel algorithms. The bounds apply Do the number of communication steps, and they apply regardless of the processors' instruction sets, the lengths of messages, etc. This paper introduces the random-adversary technique and shows how it can be used to obtain lower bounds on randomized parallel algorithms for load balancing, compaction, padded sorting, and finding Hamiltonian cycles in random graphs. Using the random-adversary technique, we obtain the first lower bounds for randomized parallel algorithms which are provably faster than their deterministic counterparts (specifically, for load balancing and related problems). C1 SANDIA NATL LABS, LIVERMORE, CA 94550 USA. RP Mackenzie, PD (reprint author), BOISE STATE UNIV, DEPT MATH & COMP SCI, BOISE, ID 83725 USA. NR 41 TC 1 Z9 1 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0097-5397 EI 1095-7111 J9 SIAM J COMPUT JI SIAM J. Comput. PD DEC PY 1997 VL 26 IS 6 BP 1559 EP 1580 DI 10.1137/S0097539791224030 PG 22 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA YJ266 UT WOS:A1997YJ26600001 ER PT J AU Bischof, CH Roh, L Mauer-oats, AJ AF Bischof, CH Roh, L Mauer-oats, AJ TI ADIC: an extensible automatic differentiation tool for ANSI-C SO SOFTWARE-PRACTICE & EXPERIENCE LA English DT Article DE automatic differentiation; derivatives; semantic augmentation; source transformation AB In scientific computing, we often require the derivatives partial derivative f/partial derivative x of a function f expressed as a program with respect to some input parameter(s) x, say, Automatic Differentiation (AD) techniques augment the program with derivative computation by applying the chain rule of calculus to elementary operations in an automated fashion, This article introduces ADIC (Automatic Differentiation of C), a new AD tool for ANSI-C programs, ADIC is currently the only tool for ANSI-C that employs a source-to-source program transformation approach; that is, it takes a C code and produces a new C code that computes the original results as well as the derivatives, We first present ADIC 'by example' to illustrate the functionality and ease of use of ADIC and then describe in detail the architecture of ADIC. ADIC incorporates a modular design that provides a foundation for both rapid prototyping of better AD algorithms and their sharing across AD tools for different languages, A component architecture called AIF (Automatic Differentiation Intermediate Form) separates core AD concepts from their language-specific implementation and allows the development of generic AD modules that can be reused directly in other AIF-based AD tools, The language-specific ADIC front-end and back-end canonicalize C: programs to make them fit for semantic augmentation and manage, for example, the association of a program variable with its derivative object, We also report on applications of ADIC to a semiconductor device simulator, 3-D CFD grid generator, vehicle simulator, and neural network code. (C) 1997 by John Wiley & Sons, Ltd. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. Univ Illinois, Dept Math, Urbana, IL 61802 USA. RP Bischof, CH (reprint author), Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM bischof@mcs.anl.gov; roh@mcs.anl.gov; mauer@math.uiuc.edu RI Bischof, Christian/D-2897-2009 NR 55 TC 84 Z9 87 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0038-0644 J9 SOFTWARE PRACT EXPER JI Softw.-Pract. Exp. PD DEC PY 1997 VL 27 IS 12 BP 1427 EP 1456 PG 30 WC Computer Science, Software Engineering SC Computer Science GA YP036 UT WOS:000071234800004 ER PT J AU Chlopecka, A Adriano, DC AF Chlopecka, A Adriano, DC TI Zinc uptake by plants on amended polluted soils (Reprinted from Plant nutrition for sustainable food production and environment, 1997) SO SOIL SCIENCE AND PLANT NUTRITION LA English DT Reprint CT 13th International Plant Nutrition Colloquium CY SEP 13-19, 1997 CL TOKYO UNIV AGR, TOKYO, JAPAN SP Japanese Soc Soil & Plant Nutr, Sci Council Japan, Int Council Plant Nutr HO TOKYO UNIV AGR DE alkaline sewage sludge; amendment; apatite; Fe oxide; zeolite ID CONTAMINATED SOILS; SEWAGE-SLUDGE; CADMIUM; METALS; COPPER; NICKEL; PH; AVAILABILITY; RYEGRASS; LEAD AB This study evaluated the efficacy of various soil amendments in reducing Zn availability in an ultisol Appling silt loam. Zinc was added to the soil at two rates (1000 and 2000 mg kg(-1)) as a defined mixture of various Zn sources (40% of ZnSO4, 25% of ZnCO3, 20% of ZnO, and 15% of ZnCl2). After soil equilibration, one of five amendments was added: lime, apatite. natural zeolite (phillipsite), Fe-rich(TM), and N-viro (an alkaline stabilized sewage sludge). Lime was added to adjust soil pH to a value of 6.5 and the zeolite, apatite, Fe-rich(TM), and N-viro were added at a rate of 25 g kg(-1). Early plant mortality resulted from Zn-treated soils receiving no amendment. In contrast, each of the soil amendments reduced Zn uptake by plants. Based on plant yield, Zn tissue concentrations, and extractability of Zn in treated soils, Fe-rich(TM), apatite, and N-viro appear to be more effective in reducing Zn availability than either Lime or zeolite. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Chlopecka, A (reprint author), Univ Georgia, Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 22 TC 8 Z9 9 U1 0 U2 1 PU JAPANESE SOC SOIL SCIENCE PLANT NUTRITION PI TOKYO PA BUSINESS CENTER ACAD SOC JAPAN 16-9, HONKOMAGOME 5-CHOME, BUNKYO-KU, TOKYO, 113, JAPAN SN 0038-0768 J9 SOIL SCI PLANT NUTR JI Soil Sci. Plant Nutr. PD DEC PY 1997 VL 43 SI SI BP 1031 EP 1036 PG 6 WC Plant Sciences; Environmental Sciences; Soil Science SC Plant Sciences; Environmental Sciences & Ecology; Agriculture GA ZB142 UT WOS:000072440600018 ER PT J AU Bogner, J Meadows, M Czepiel, P AF Bogner, J Meadows, M Czepiel, P TI Fluxes of methane between landfills and the atmosphere: natural and engineered controls SO SOIL USE AND MANAGEMENT LA English DT Article DE ethane; emission; soil; landfills; World ID COVER SOIL; TRACER METHODS; OXIDATION; EMISSIONS; RATES; LASER; CONSUMPTION; NITROGEN; BACTERIA; WATER AB Field measurement of landfill methane (CH4) emissions indicates natural variability spanning more than seven orders of magnitude, from less than 0.0004 to more than 4000 g/m(2) per day. This aide range reflects net emissions resulting from production (methanogenesis), consumption (methanotrophic oxidation), and gaseous transport processes. The determination of an 'average' emission rate for a given field site requires sampling designs and statistical techniques which consider spatial and temporal variability. Moreover, particularly at sites with pumped gas recovery systems, it is possible for methanotrophic microorganisms in aerated cover soils to oxidize all of the CH4 from landfill sources below and, additionally, to oxidize CH4 diffusing into cover soils from atmospheric sources above In such cases, a reversed soil gas concentration gradient is observed in shallow cover soils, indicating bidirectional diffusional transport to the depth of optimum CH4 oxidation. Rates of landfill CH4 oxidation from field and laboratory incubation studies range up to 166 g/m(2) per day among the highest for any natural setting, providing an effective natural control on net emissions. It has been shown that methanotrophs in landfill soils can adapt rapidly to elevated CH4 concentrations with increased rates of CH4 oxidation related to depth of oxygen penetration, soil moisture, and the nutrient status of the soil. Estimates of worldwide landfill CH4 emissions to the atmosphere have ranged from 9 to 70 Tg/y, differing mainly in assumed CH4 yields from estimated quantities of landfilled refuse. At highly controlled landfill sites in developed countries, landfill CH4 is often collected via vertical wells or horizontal collectors. Recovery of landfill CH4 through engineered systems can provide both environmental and energy benefits by mitigating subsurface migration, reducing surface emissions, and providing an alternative energy resource far industrial, boiler use, on-site electrical generation, or upgrading to a substitute natural. gas. Manipulation of landfill cover soils to maximize their oxidation potential could provide a complementary strategy for controlling CH4 emissions, particularly at older sites where the CH4 concentration in landfill gas is too lon for energy recovery or flaring. For the future, it is necessary to better quantify net emissions relative to rates of CH4 production, oxidation, and transport. Field measurements, manipulative studies, and model development are currently underway at various spatial scales in several countries. C1 Argonne Natl Lab, Argonne, IL 60439 USA. ETSU, Harwell, Oxon, England. Harvard Univ, Cambridge, MA 02138 USA. RP Bogner, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 67 TC 91 Z9 95 U1 0 U2 35 PU C A B INTERNATIONAL PI WALLINGFORD PA C/O PUBLISHING DIVISION, WALLINGFORD OX10 8DE, OXON, ENGLAND SN 0266-0032 J9 SOIL USE MANAGE JI Soil Use Manage. PD DEC PY 1997 VL 13 IS 4 SU S BP 268 EP 277 DI 10.1111/j.1475-2743.1997.tb00598.x PG 10 WC Soil Science SC Agriculture GA YU759 UT WOS:000071751400006 ER PT J AU Contreras, MA Wiesner, H Tuttle, J Ramanathan, K Noufi, R AF Contreras, MA Wiesner, H Tuttle, J Ramanathan, K Noufi, R TI Sues on the chalcopyrite/defect-chalcopyrite junction model for high-efficiency Cu(In,Ga)Se-2 solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article DE chalcopyrite/defect-chalcopyrite junction model; Cu(In,Ga)Se-2; solar cells ID THIN-FILMS AB Considering the chalcopyrite/defect-chalcopyrite junction model for Cu(In1-xGax)Se-2-based devices and our previously reported findings for the Cu(In1-xGax)(3)Se-5 defect chalcopyrites, we have postulated that uniform high-Ga-content photovoltaic structures (with x > 0.35) do not yield acceptable device performance due to the electrical and structural differences between both types of materials (chalcopyrite and defect-chalcopyrite). In this contribution, the structural properties of the surface region of Ga containing absorber materials have been studied by grazing incidence X-ray diffraction. We find that there are significant differences between surface and bulk. A structural model is proposed for the growth of the chalcopyrite/defect-chalcopyrite junction relative to its Ga content. And we demonstrate that closely lattice matched high-Ga-content structures (x > 0.35) can produce solar cells with acceptable performances. The high-voltage and low-current electrical outputs from high Ga structures are very desirable in module fabrication because overall resistive losses can be substantially reduced. RP NATL RENEWABLE ENERGY LAB, 1617 COLE BLVD, GOLDEN, CO 80401 USA. NR 9 TC 12 Z9 12 U1 0 U2 5 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 DEC PY 1997 VL 49 IS 1-4 BP 239 EP 247 DI 10.1016/S0927-0248(97)00200-6 PG 9 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA YH232 UT WOS:A1997YH23200033 ER PT J AU Sadewasser, S Looney, C Schilling, JS Schlueter, JA Williams, JM Nixon, PG Winter, RW Gard, GL AF Sadewasser, S Looney, C Schilling, JS Schlueter, JA Williams, JM Nixon, PG Winter, RW Gard, GL TI Dependence of T-c on hydrostatic pressure in beta''-(ET)(2)SF5CH2CF2SO3 and kappa-(ET)(2)Cu(NCS)(2) SO SOLID STATE COMMUNICATIONS LA English DT Article DE organic crystals; superconductors; phase transitions; strain; high pressure ID BAND ELECTRONIC-STRUCTURE; ORGANIC SUPERCONDUCTOR; TRANSITION-TEMPERATURE; SOLID HELIUM; BEDT-TTF AB The dependence of T-c on hydrostatic (He-gas) pressure is determined for the recently discovered organic superconductor beta ''-(ET)(2)SF5CH2CF2SO3 [ET = bis(ethylenedithio)-tetrathiafulvalene] with T-c(0)similar or equal to 5 K, yielding the pressure derivative dT(c)/dP similar or equal to -1.34 K kbar(-1). The present experiments also included kappa-(ET)(2)Cu(NCS)(2) where we find the extremely large value dT(c)/dP = -3.84 K kbar in agreement with earlier studies. For both samples the pressure dependence T-c(P) does not depend on the temperature at which the pressure is changed. (C) 1997 Elsevier Science Ltd. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. PORTLAND STATE UNIV,DEPT CHEM,PORTLAND,OR 97207. RP Sadewasser, S (reprint author), WASHINGTON UNIV,DEPT PHYS,CB 1105,1 BROOKINGS DR,ST LOUIS,MO 63130, USA. RI Sadewasser, Sascha/E-6229-2012; OI Sadewasser, Sascha/0000-0001-8384-6025 NR 20 TC 19 Z9 19 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD DEC PY 1997 VL 104 IS 10 BP 571 EP 575 DI 10.1016/S0038-1098(97)00398-0 PG 5 WC Physics, Condensed Matter SC Physics GA YH937 UT WOS:A1997YH93700001 ER PT J AU Zhang, Y Fluegel, B Mascarenhas, A Geisz, JF Olson, JM Alsina, F Duda, A AF Zhang, Y Fluegel, B Mascarenhas, A Geisz, JF Olson, JM Alsina, F Duda, A TI Low-temperature birefringence in ordered GaInP alloy studied by polarized transmission spectroscopy SO SOLID STATE COMMUNICATIONS LA English DT Article DE order-disorder effects; optical properties; semiconductors; crystal structure and symmetry ID MULTIPLE-QUANTUM WELLS; REFRACTIVE-INDEX; PHOTOLUMINESCENCE; OPTICS AB The low-temperature birefringence of spontaneously ordered GaInP is studied by using polarized transmission spectroscopy at 5 K. Refractive indexes n(o), n(e) and the birefringence Delta n(oe) = n(o)-n(e) are obtained by applying two independent techniques: (1) measuring the polarized transmission spectra with polarization parallel to each of the two cleaved edges individually; and (2) measuring one transmission spectrum with a crosspolarization configuration. The results of these two techniques are consistent, and both give Delta n(oe) similar to 0.02 near the band-gap of partially ordered GaInP. Exact and approximate formulae have been derived for analyzing the cross-polarization spectrum. A possible device-polarization rotator-is proposed based on the in-plane birefringence. (C) 1997 Elsevier Science Ltd. RP Zhang, Y (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Alzina, Francesc/C-5468-2008 OI Alzina, Francesc/0000-0002-7082-0624 NR 17 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD DEC PY 1997 VL 104 IS 10 BP 577 EP 580 DI 10.1016/S0038-1098(97)00392-X PG 4 WC Physics, Condensed Matter SC Physics GA YH937 UT WOS:A1997YH93700002 ER PT J AU Vartuli, CB Pearton, SJ Abernathy, CR MacKenzie, JD Ren, F Zolper, JC Shul, RJ AF Vartuli, CB Pearton, SJ Abernathy, CR MacKenzie, JD Ren, F Zolper, JC Shul, RJ TI Wet chemical etching survey of III-nitrides SO SOLID-STATE ELECTRONICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; GALLIUM NITRIDE; GAN; ALN; INN; GROWTH; PLASMAS; FILMS; GAAS; DIODES AB Wet chemical etching of GaN, InN, AlN; InAlN and InGaN was investigated in various acid and base solutions at temperatures up to 75 degrees C. Only KOH-based solutions were found to etch AIN and InAlN. No enchants were found for the other nitrides, emphasizing; their extreme lack of chemical reactivity. The native oxide on most of the nitrides could be removed in potassium tetraborate at 75 degrees C, or HCl/H2O at 25 degrees C. (C) 1997 Elsevier Science Ltd. C1 AT&T BELL LABS,LUCENT TECHNOL,MURRAY HILL,NJ 07974. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Vartuli, CB (reprint author), UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611, USA. NR 40 TC 53 Z9 55 U1 3 U2 22 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD DEC PY 1997 VL 41 IS 12 BP 1947 EP 1951 DI 10.1016/S0038-1101(97)00173-1 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA YL168 UT WOS:A1997YL16800019 ER PT J AU Schlom, DG Knapp, SB Wozniak, S Zou, LN Park, J Liu, Y Hawley, ME Brown, GW Dabkowski, A Dabkowska, HA Uecker, R Reiche, P AF Schlom, DG Knapp, SB Wozniak, S Zou, LN Park, J Liu, Y Hawley, ME Brown, GW Dabkowski, A Dabkowska, HA Uecker, R Reiche, P TI Growth of epitaxial (Sr,Ba)(n+1)RunO3n+1 films SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 3rd European Conference on Applied Superconductivity CY JUN 30-JUL 03, 1997 CL NETHERLANDS ID CRYSTAL-GROWTH; SR2RUO4 FILMS; PEROVSKITE; SYSTEM AB We have grown epitaxial (Sr, Ba)(n+1)RunO3n+1 films, n = 1,2 and infinity, by pulsed laser deposition (PLD) and controlled their orientation by choosing appropriate substrates. The growth conditions yielding phase-pure films have been mapped out. Resistivity versus temperature measurements show that both a-axis and c-axis films of Sr2RuO4 are metallic, but not superconducting. The latter is probably due to the presence of low-level impurities that are difficult to avoid given the target preparation process involved in growing these films by PLD. C1 Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. McMaster Univ, Inst Mat Res, Hamilton, ON L8S 4M1, Canada. Inst Crystal Growth, D-12489 Berlin, Germany. RP Schlom, DG (reprint author), Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA. RI Schlom, Darrell/J-2412-2013 OI Schlom, Darrell/0000-0003-2493-6113 NR 20 TC 8 Z9 8 U1 0 U2 16 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD DEC PY 1997 VL 10 IS 12 BP 891 EP 895 DI 10.1088/0953-2048/10/12/006 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA YM502 UT WOS:000071069900006 ER PT J AU Walter, KC Kern, KT Tesmer, JR Scarborough, WK Woodring, JS Nastasi, M AF Walter, KC Kern, KT Tesmer, JR Scarborough, WK Woodring, JS Nastasi, M TI Nitrogen and boron ion implantation into electrodeposited hard chrome SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 5th International Conference on Plasma Surface Engineering CY SEP 09-13, 1996 CL GARMISCH PARTENKI, GERMANY SP European Joint Comm Plasma & Ion Surf Engn DE electrodeposited hard chrome; ion implantation; nanohardness ID WEAR; METALS; FILMS; MICROSTRUCTURE; REDUCTION; BEHAVIOR; LAYERS AB Electrodeposited hard chrome has been ion implanted with nitrogen alone, boron alone, and a combination of nitrogen and boron. Separately, nitrogen and boron implantation was carried out at 75 keV and incident doses of 2, 4 and 8 x 10(17) at cm(-2). Samples implanted with both nitrogen and boron used beam energies of 75 keV and incident dose levels of 4 x 10(17) N-at cm(-2) and 4 x 10(17) B-at cm(-2). All ion implantations were accomplished using a beam-line system. The retained dose was measured using ion beam analysis. Surface hardness, wear coefficient and the coefficient of friction were determined by nanohardness indentation and pin-on-disk wear testing of each sample. Ion beam analysis indicated a majority of the incident dose was retained. At a depth of 50 nm, the surface hardness increased from 18 +/- 1 GPa for unimplanted chrome, to a maximum of 23 +/- 4 GPa for boron implanted chrome and 26 +/- 1 GPa for nitrogen implanted chrome. Pin-on-disk wear testing indicated reductions in the wear coefficient by factors of 1.3-7.4, depending on the implantation treatment. It is shown that nitrogen implantation of chromium results in lower wear coefficients than boron implantation. (C) 1997 Elsevier Science S.A. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Norfolk State Univ, Ctr Mat Res, Norfolk, VA 23504 USA. RP Walter, KC (reprint author), Univ Calif Los Alamos Natl Lab, MS-K762, Los Alamos, NM 87545 USA. NR 21 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC PY 1997 VL 97 IS 1-3 BP 250 EP 253 DI 10.1016/S0257-8972(97)00194-1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA ZD061 UT WOS:000072647000035 ER PT J AU Ellis, WP Bastasz, R AF Ellis, WP Bastasz, R TI Low-energy He-4(+) scattering from deuterium adsorbed on stepped Pd(331) SO SURFACE REVIEW AND LETTERS LA English DT Article; Proceedings Paper CT 5th International Conference on the Structure of Surfaces (ICSOS-5) CY JUL 08-12, 1996 CL UNIV AIX MARSEILLE, AIX PROVENCE, FRANCE HO UNIV AIX MARSEILLE ID SURFACES; PD(110) AB We have taken angle-resolved data for the scattering of low-energy (< 1 keV) He-4(+) from deuterium adsorbed on a stepped Pd(331) surface. The impact geometry was "up the staircase," i.e. the He-4(+) beam was perpendicular to and directly incident onto the unshadowed [011] Pd ledge atoms. A strong quasielastic scattering signal of He-4(+) from D (He-4(+)/D) was observed at a forward-scattering angle of theta = 25 degrees and an incidence angle of alpha = 76 degrees from the (331) normal. The results agree with shadow-cone calculations of scattering first from Pd ledge atoms followed by a second event, He-4(+)/D. The resultant adsorption geometry shows D to reside in the quasi-threefold ledge site on the surface directly above the bulk fee octahedral void. These results are consistent with the previous He-4(+) scattering study of the geometrically related Pd(110)-D(ads) system. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Sandia Natl Labs, Org 8716, Livermore, CA 94551 USA. RP Ellis, WP (reprint author), Univ Calif Los Alamos Natl Lab, CST-1,MS J565, Los Alamos, NM 87545 USA. NR 8 TC 1 Z9 1 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 0218-625X J9 SURF REV LETT JI Surf. Rev. Lett. PD DEC PY 1997 VL 4 IS 6 BP 1305 EP 1308 DI 10.1142/S0218625X97001711 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YX219 UT WOS:000072018300038 ER PT J AU Shultz, AN Hetherington, WM Baer, DR Wang, LQ Engelhard, MH AF Shultz, AN Hetherington, WM Baer, DR Wang, LQ Engelhard, MH TI Comparative SHG and XPS studies of interactions between defects and N2O on rutile TiO2(110) surfaces SO SURFACE SCIENCE LA English DT Article DE nitrogen oxide; oxygen; SHG; surface defects; titanium oxide; XPS ID STIMULATED DESORPTION; SYNCHROTRON RADIATION; TIO2; ADSORPTION; OXYGEN; H2O; CHEMISORPTION; SPECTROSCOPY; HYDROGEN; DENSITY AB In previous studies on TiO2(110) surfaces O-2 has been shown to heal Ti3+ defects generated by above band-gap UV or low-energy electron-beam exposure. Electron affinity, rather than oxygen content may dictate whether a molecule will interact with a defect to result in defect healing. This paper examines interactions between TiO2(110) surfaces and N2O which has a substantial electron affinity. N2O is seen to heal defects at comparable exposures to those needed for O-2 healing. XPS indicates that N2O heals defects by dissociating such that no nitrogen remains on the surface. XPS could detect no difference between surfaces healed by N2O and those healed by O-2. However, SHG indicates that surfaces healed by N2O differ slightly from surfaces similarly healed by O-2, suggesting that O-2 may interact with defects on these surfaces to form Ti4+:O-2(-) complexes. (C) 1997 Elsevier Science B.V. C1 OREGON STATE UNIV, DEPT PHYS, CORVALLIS, OR 97331 USA. PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. PACIFIC NW LAB, MAT & CHEM SCI CTR, RICHLAND, WA 99352 USA. RP Shultz, AN (reprint author), FT LEWIS COLL, DEPT PHYS & ENGN, DURANGO, CO 81301 USA. RI Engelhard, Mark/F-1317-2010; Baer, Donald/J-6191-2013; OI Baer, Donald/0000-0003-0875-5961; Engelhard, Mark/0000-0002-5543-0812 NR 31 TC 21 Z9 21 U1 4 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD DEC 1 PY 1997 VL 392 IS 1-3 BP 1 EP 7 DI 10.1016/S0039-6028(96)01006-0 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YL162 UT WOS:A1997YL16200013 ER PT J AU Logan, J Volkow, ND Fowler, JS Wang, GJ Fischman, MW Foltin, RW Abumrad, NN Vitkun, S Gatley, SJ Pappas, N Hitzemann, R Shea, CE AF Logan, J Volkow, ND Fowler, JS Wang, GJ Fischman, MW Foltin, RW Abumrad, NN Vitkun, S Gatley, SJ Pappas, N Hitzemann, R Shea, CE TI Concentration and occupancy of dopamine transporters in cocaine abusers with [C-11]cocaine and PET SO SYNAPSE LA English DT Article DE brain; Bmax; compartment model ID POSITRON EMISSION TOMOGRAPHY; I-123 BETA-CIT; C-11 RACLOPRIDE BINDING; HUMAN-BRAIN; SEROTONIN TRANSPORTERS; GRAPHICAL ANALYSIS; NONHUMAN-PRIMATES; KINETIC-ANALYSIS; UPTAKE SITES; MODEL AB The concentration (Bmax) of the dopamine transporter (DAT) and the maximum and effective occupancies by cocaine doses of 0.1 mg/kg or 0.05 mg/kg were measured in the striatum of cocaine abusers (n = 12) by using [C-11]cocaine as a radiotracer for the DAT and positron emission tomography (PET). Two methods based on a three-compartment model with one binding site (the nonlinear least squares (NLSQ) and the Farde pseudoequilibrium method) were used to estimate Bmax. Effective occupancies and maximum occupancies were calculated from the distribution volume ratios (DVR) and a three-compartment model, respectively. The NLSQ and Farde methods gave similar values of Bmax (average, 650 +/- 350 pmol/ml and 776 +/- 400 pmol/ml, respectively), but the individual estimates of Bmax were found to be very sensitive to small variations in other model parameters and were not correlated with the parameter Bmax/Kd (r = .07). The average maximum (and effective) occupancies were found to be 67% (50%) and 52% (39%) for the 0.1-mg/kg and the 0.05-mg/kg studies, respectively. The ED50 based on the effective occupancy corresponds to 0.1 mg/kg, which is significantly smaller than the ED50 Of 3 mg/kg calculated from studies in which [I-123] beta-CIT is displaced by cocaine. The effect on the Bmax estimate of two binding sites with different Kd's is also considered by simulation. We conclude (1) that the lack of robustness in the Bmax estimate limits the usefulness of any one subject's Bmax and suggests that the combination parameter Bmax/Kd (or the DVR), which has been used extensively, is a more stable measure of free receptor/ transporter concentration. The average Bmax may, however, provide an estimate of the expected concentration in humans. (2) The DVR can be used as a measure of DAT occupancy without applying an explicit model. (C) 1997 Wiley-Liss, Inc.(dagger) C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. SUNY STONY BROOK,DEPT ANESTHESIOL,STONY BROOK,NY 11794. COLUMBIA UNIV,DEPT PSYCHIAT,NEW YORK,NY. N SHORE UNIV HOSP,DEPT SURG,MANHASSET,NY. RP Logan, J (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. FU NIDA NIH HHS [DA09490-01, DA-03818] NR 29 TC 39 Z9 40 U1 2 U2 4 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-4476 J9 SYNAPSE JI Synapse PD DEC PY 1997 VL 27 IS 4 BP 347 EP 356 DI 10.1002/(SICI)1098-2396(199712)27:4<347::AID-SYN8>3.0.CO;2-C PG 10 WC Neurosciences SC Neurosciences & Neurology GA YE826 UT WOS:A1997YE82600008 PM 9372557 ER PT J AU Baker, RJ Longmire, JL Maltbie, M Hamilton, MJ Van den Bussche, RA AF Baker, RJ Longmire, JL Maltbie, M Hamilton, MJ Van den Bussche, RA TI DNA synapomorphies for a variety of taxonomic levels from a cosmid library from the new world bat Macrotus waterhousii SO SYSTEMATIC BIOLOGY LA English DT Article DE Cosmid library; DNA synapomorphies; genome; Macrotus waterhousii; phylogenetic screening; Rhinolophoidea; taxonomic levels ID HIGHLY REPETITIVE DNA; CORAL GENUS ACROPORA; SATELLITE DNA; CONCERTED EVOLUTION; PHYLOGENETIC-RELATIONSHIPS; INTRAGENOMIC MOVEMENT; INSITU HYBRIDIZATION; RETROTRANSPOSON MYS; GENOME ORGANIZATION; PEROMYSCUS-LEUCOPUS AB An effective method yielding taxon-specific markers from the genome of a single individual would be valuable for many types of scientific investigations, including systematic, forensic, conservation, and evolutionary studies. We explored the use of cosmid libraries, with insert sizes averaging 35 kb, to streamline the process of locating sequences of DNA that can serve as taxonomic markers from the specific to the ordinal levels. By screening approximately 2.6% of the leaf-nosed bat (Macrotus waterhousii) genome, we identified several potential DNA fragments that appear to be synapomorphic for a variety of taxonomic levels. A more thorough analysis of the markers documented that 17 Macrotus-specific clones represent three distinct DNA generic markers, whereas 30 microchiropteran clones represent multiple copies of a single family of repetitive DNA. The Microchiroptera taxon markers hybridize with representatives of most of the Microchiroptera families; however, no hybridization was detected for members of the superfamily Rhinolophoidea. These results demonstrate that cosmid libraries can be a valuable source for isolating taxon-specific markers from mammals even when the insert size is as large as 35 kb. C1 Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. Texas Tech Univ Museum, Lubbock, TX 79409 USA. Los Alamos Natl Lab, Div Life Sci, Genom Grp, Los Alamos, NM 87545 USA. RP Baker, RJ (reprint author), Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. EM bjrjb@ttacs.ttu.edu; mjh@okway.okstate.edu; ron.van.den.bussche@okway.okstate.edu NR 51 TC 13 Z9 14 U1 0 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1063-5157 J9 SYST BIOL JI Syst. Biol. PD DEC PY 1997 VL 46 IS 4 BP 579 EP 589 DI 10.2307/2413496 PG 11 WC Evolutionary Biology SC Evolutionary Biology GA YX756 UT WOS:000072074100001 PM 11975334 ER PT J AU Smirnov, BI Nikolaev, VI Burenkov, YA Routbort, JL Goretta, KC AF Smirnov, BI Nikolaev, VI Burenkov, YA Routbort, JL Goretta, KC TI Some physical properties of an Al2O3-SiC-TiC composite SO TECHNICAL PHYSICS LETTERS LA English DT Article ID WHISKER-REINFORCED ALUMINA; BEHAVIOR AB Ceramic samples obtained by hot pressing from a mixture of Al2O3 with admixtures of 23 vol.% TiC powder and 30.9 vol.% SiC whisker crystals are investigated experimentally. The resistivity of the material is measured at temperatures of 4.2-300 K, the infrared reflection spectra are recorded in the region 400-4200 cm(-1), and the temperature dependence of the Young's modulus is investigated at temperatures up to 1300 K. As a result it is it is shown that the conductivity and optical reflection of the high-strength composite have a semimetallic character, which is due to the titanium carbide particles contained in it. (C) 1997 American Institute of Physics. [S1063-7850(97)01012-4]. C1 Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 196140, Russia. Argonne Natl Lab, Argonne, IL 60439 USA. RP Smirnov, BI (reprint author), Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 196140, Russia. NR 11 TC 0 Z9 0 U1 2 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1063-7850 J9 TECH PHYS LETT+ JI Tech. Phys. Lett. PD DEC PY 1997 VL 23 IS 12 BP 923 EP 926 DI 10.1134/1.1261934 PG 4 WC Physics, Applied SC Physics GA ZW424 UT WOS:000074409600010 ER PT J AU Morgan, DL Shines, CJ Jeter, SP Blazka, ME Elwell, MR Wilson, RE Ward, SM Price, HC Moskowitz, PD AF Morgan, DL Shines, CJ Jeter, SP Blazka, ME Elwell, MR Wilson, RE Ward, SM Price, HC Moskowitz, PD TI Comparative pulmonary absorption, distribution, and toxicity of copper gallium diselenide, copper indium diselenide, and cadmium telluride in Sprague-Dawley rats SO TOXICOLOGY AND APPLIED PHARMACOLOGY LA English DT Article ID MACROPHAGE FIBRONECTIN RELEASE; ALVEOLAR MACROPHAGE; LUNG INJURY; FIBROSIS; RESPONSES; AEROSOL; CELLS AB Copper gallium diselenide (CGS), copper indium diselenide (CIS), and cadmium telluride (CdTe) are novel compounds used in the photovoltaic and semiconductor industries. This study was conducted to characterize the relative toxicities of these compounds and to evaluate the pulmonary absorption and distribution after intratracheal instillation. Female Sprague-Dawley rats were administered a single equimolar dose (70 mM) of CGS (21 mg/kg), CIS (24 mg/kg), CdTe (17 mg/kg), or saline by intratracheal instillation. Bronchoalveolar lavage fluid (BALF) protein, fibronectin, inflammatory cells, lung hydroxyproline, and tissue distribution were measured 1, 3, 7, 14, and 28 days after instillation. Relative lung weights were significantly increased in CIS- and CdTe-treated rats at most time points. Inflammatory lesions in the lungs consisting of an influx of macrophages, lymphocytes, and PMNs were most severe in CdTe-treated rats, intermediate in CIS-treated rats, and minimal in rats receiving CGS. Hyperplasia of alveolar type 2 cells was present in CIS-and CdTe-treated rats and was greatest in CdTe-treated rats. Pulmonary interstitial fibrosis was observed in CdTe-treated rats at all time points. All three compounds caused marked increases in total BALF cell numbers, with the greatest increase observed in CIS-treated rats. BALF protein, fibronectin, and lung hydroxyproline were significantly increased in all treated animals and were highest in CdTe-treated animals. There was no apparent pulmonary absorption or tissue distribution of CGS. Indium levels increased in extrapulmonary tissues of CIS-treated rats, although Cu and Se levels remained unchanged. CdTe was absorbed from the lung to a greater extent than CGS and CIS. Cd and Te levels decreased in the lung and increased in extrapulmonary tissues. Of these compounds CdTe presents the greatest potential health risk because it causes severe pulmonary inflammation and fibrosis and because it is readily absorbed from the lung may potentially cause extrapulmonary toxicity. C1 NIEHS, Res Triangle Pk, NC 27709 USA. Mantech Environm Technol Inc, Res Triangle Pk, NC 27709 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Morgan, DL (reprint author), NIEHS, POB 12233, Res Triangle Pk, NC 27709 USA. NR 27 TC 24 Z9 25 U1 0 U2 4 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0041-008X J9 TOXICOL APPL PHARM JI Toxicol. Appl. Pharmacol. PD DEC PY 1997 VL 147 IS 2 BP 399 EP 410 DI 10.1006/taap.1997.8267 PG 12 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA YR553 UT WOS:000071506800024 PM 9439735 ER PT J AU David, SA Babu, SS AF David, SA Babu, SS TI Modeling microstructure development in weld metals SO TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS LA English DT Article; Proceedings Paper CT International Symposium on Fifty Years of Metallurgy - Retrospect and Prospect CY NOV, 1996 CL NEW DELHI, INDIA ID RAPID SOLIDIFICATION; INCLUSION FORMATION; STEEL; MECHANISMS; DEPOSITS AB Microstructure development in the weld metal region is controlled by various physical processes such as thermochemical reactions in liquid, solidification, and solid state transformation. There is a need for fundamental and generalized models that can predict the effect of these physical processes on microstructure development in a wide variety of alloy systems during welding processes. This paper describes certain advances made in the area of modeling the microstructure development in low-alloy steel, stainless steel, and Ni-base superalloy. In addition, this paper describes the importance of advanced analytical techniques for fundamental understanding of phase transformation mechanisms in welds. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP David, SA (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008, Oak Ridge, TN 37831 USA. RI Babu, Sudarsanam/D-1694-2010 OI Babu, Sudarsanam/0000-0002-3531-2579 NR 58 TC 1 Z9 1 U1 0 U2 1 PU INDIAN INST METALS PI CALCUTTA PA METAL HOUSE, PLOT 13/4, BLOCK AQ, SECTOR V, SALT LAKE, CALCUTTA 700 091, INDIA SN 0019-493X J9 T INDIAN I METALS JI Trans. Indian Inst. Met. PD DEC PY 1997 VL 50 IS 6 BP 591 EP 602 PG 12 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA ZJ933 UT WOS:000073268300017 ER PT J AU Dsouza, M Larsen, N Overbeek, R AF Dsouza, M Larsen, N Overbeek, R TI Searching for patterns in genomic data SO TRENDS IN GENETICS LA English DT Article C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. Michigan State Univ, Ctr Microbial Ecol, E Lansing, MI 48824 USA. RP Dsouza, M (reprint author), Argonne Natl Lab, Div Math & Comp Sci, Bldg 221,9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 201 Z9 208 U1 0 U2 10 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0168-9525 J9 TRENDS GENET JI Trends Genet. PD DEC PY 1997 VL 13 IS 12 BP 497 EP 498 DI 10.1016/S0168-9525(97)01347-4 PG 2 WC Genetics & Heredity SC Genetics & Heredity GA YM147 UT WOS:000071033900010 PM 9433140 ER PT J AU Bois, FY Fahmy, T Block, JC Gatel, D AF Bois, FY Fahmy, T Block, JC Gatel, D TI Dynamic modeling of bacteria in a pilot drinking-water distribution system SO WATER RESEARCH LA English DT Article DE bacterial growth model; biofilm; Markov chain Monte Carlo sampling; Metropolis-Hastings algorithm; water distribution networks ID BAYESIAN-ANALYSIS AB Computer modeling can be a useful tool in understanding the dynamics of bacterial population growth. Yet, the variability and complexity of biological systems pose unique challenges in model building and adjustment. Recent tools from Bayesian statistical inference can be brought together to solve these problems. As an example, the authors modeled the development of biofilm in an industrial pilot drinking-water network. The relationship between chlorine disinfectant, organic carbon, and bacteria concentrations was described by differential equations. Using a Bayesian approach, they derived statistical distributions for the model parameters, on the basis of experimental data. The model was found to adequately fit both prior biological information and the data, particularly at chlorine concentrations between 0.1 and 2 mg/liter. Bacteria were found to have different characteristics in the different parts of the network. The model was used to analyze the effects of various scenarios of water quality at the inlet of the network. The biofilm appears to be very resistant to chlorine and confers a large inertia to the system. Free bacteria are efficiently inactivated by chlorine, particularly at low concentrations of dissolved organic carbon. (C) 1997 Elsevier Science Ltd. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Ecole Natl Genie Rural Eaux & Forets, GRESE, Paris, France. Co Gen Eaux, Paris, France. NANCIE, Nancy, France. RP Bois, FY (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS 90-3058, Berkeley, CA 94720 USA. EM fbois@diana.lbl.gov RI Bois, Frederic/E-9241-2012 OI Bois, Frederic/0000-0002-4154-0391 NR 34 TC 34 Z9 36 U1 0 U2 20 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0043-1354 J9 WATER RES JI Water Res. PD DEC PY 1997 VL 31 IS 12 BP 3146 EP 3156 DI 10.1016/S0043-1354(97)00178-4 PG 11 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA YM261 UT WOS:000071045900025 ER PT J AU Anderson, SP Dietrich, WE Montgomery, DR Torres, R Conrad, ME Loague, K AF Anderson, SP Dietrich, WE Montgomery, DR Torres, R Conrad, ME Loague, K TI Subsurface flow paths in a steep, unchanneled catchment SO WATER RESOURCES RESEARCH LA English DT Article ID HUMID HEADWATER CATCHMENTS; SMALL FORESTED CATCHMENT; STORM RUNOFF GENERATION; TRANSPORT PROCESSES; SOLUTE TRANSPORT; STREAM CHEMISTRY; WATER; SOIL; FLOWPATHS; DEUTERIUM AB Tracer studies during catchment-scale sprinkler experiments illuminate the pathways of subsurface flow in a small, steep catchment in the Oregon Coast Range. Bromide point injections into saturated materials showed rapid flow in bedrock to the catchment outlet. Bedrock flow returned to the colluvium, sustaining shallow subsurface flow there. The bromide peak velocity of similar to 10(-3) m s(-1) exceeded the saturated hydraulic conductivity of intact bedrock. This, and the peak shapes, verify that fractures provide important avenues for saturated flow in the catchment. Deuterium added to the sprinkler water moved through the vadose zone as plug flow controlled by rainfall rate and water content. Ninety-two percent of the labeled water remained in the vadose zone after 3 days (similar to 140 mm) of sprinkling. Preferential flow of new water was not observed during either low-intensity irrigation or natural storms; however, labeled preevent water was mobile in shallow colluvium during a storm following our spiking experiment. In response to rainfall, waters from the deeper bedrock pathway, which have traveled through the catchment, exfiltrate into the colluvium mantle and mix with relatively young vadose zone water, derived locally, creating an area of subsurface saturation near the channel head. This effectively becomes a subsurface variable source area, which, depending on its size and the delivery of water from the vadose zone, dictates the apportioning of old and new water in the runoff and, correspondingly, the runoff chemistry. The slow movement of water through the vadose zone allows for chemical modification and limits the amount of new water in the runoff. Moreover, it suggests that travel time of new rain water does not control the timing of runoff generation. C1 UNIV CALIF SANTA CRUZ,INST TECTON,SANTA CRUZ,CA 95064. LAWRENCE BERKELEY LAB,BERKELEY CTR ISOTOPE GEOCHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. STANFORD UNIV,DEPT GEOL & ENVIRONM SCI,STANFORD,CA 94305. UNIV WASHINGTON,DEPT GEOL SCI,SEATTLE,WA 98195. RP Anderson, SP (reprint author), UNIV CALIF SANTA CRUZ,DEPT EARTH SCI,SANTA CRUZ,CA 95064, USA. RI Conrad, Mark/G-2767-2010; Anderson, Suzanne/F-4039-2014 OI Anderson, Suzanne/0000-0002-6796-6649 NR 52 TC 153 Z9 156 U1 2 U2 41 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD DEC PY 1997 VL 33 IS 12 BP 2637 EP 2653 DI 10.1029/97WR02595 PG 17 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA YJ964 UT WOS:A1997YJ96400002 ER PT J AU Ho, CK AF Ho, CK TI Evaporation of pendant water droplets in fractures SO WATER RESOURCES RESEARCH LA English DT Article ID EQUATION AB This paper investigates the evaporation of pendant water droplets in fractured tuffaceous rock. The droplets are assumed to exist near asperities and cavities as a result of gravity-dominated flow through fractures. Because pf the curvature of the droplet, the vapor pressure near the liquid-vapor interface is greater than the saturated vapor pressure of water held in the matrix at the system temperature. Expressions for the vapor pressure and evaporation rate of water droplets are developed as a function of droplet radius and relative humidity of the surroundings. The relative humidity is calculated using Kelvin's equation to account for vapor pressure lowering in the surrounding tuffaceous rock. Results indicate that the vapor pressure of water droplets is not significantly increased above the saturated vapor pressure of freestanding water when the droplet size is greater than 100 mu m. However, if the relative humidity of the surroundings is exactly equal to 1 or if the droplet radius is very small (<< 1 mu m), the effects of interface curvature will enhance the evaporation of water droplets. Finally, expressions are developed to determine the minimum liquid flux required to propagate flow through either a single fracture or a network of fractures without being evaporated. RP Ho, CK (reprint author), SANDIA NATL LABS,POB 5800,MS 1324,ALBUQUERQUE,NM 87185, USA. NR 10 TC 17 Z9 17 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD DEC PY 1997 VL 33 IS 12 BP 2665 EP 2671 DI 10.1029/97WR02489 PG 7 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA YJ964 UT WOS:A1997YJ96400004 ER PT J AU Kim, JW AF Kim, JW TI Precipitation and snow budget over the southwestern United States during the 1994-1995 winter season in a mesoscale model simulation SO WATER RESOURCES RESEARCH LA English DT Article ID SOIL HYDROLOGY; CALIFORNIA; RAINFALL; PARAMETERIZATION; STREAMFLOW; SCHEME AB Precipitation and snow budget over the southwestern United States during the 1994-1995 winter were simulated using an interactively coupled mesoscale atmospheric-land surface model. Temporal and spatial distributions of simulated precipitation agreed closely with available observations. It is found that precipitation in California is closely correlated with the moisture influx from the Pacific Ocean. The observed and simulated precipitation indicates that over 70% of the total precipitation in the area during this period was associated with less than 30% of the total winter storms passing this region. Amounts of the simulated season total precipitation generally increased with elevation, with maximum precipitation, mostly in the form of snow, occurring along the ridge of the Sierra Nevada. Simulated surface snow budget indicates that snow plays a major role in seasonal surface hydrology at high elevations where most of surface runoff originates during spring and summer seasons. RP Kim, JW (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L-256, LIVERMORE, CA 94551 USA. NR 34 TC 21 Z9 21 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD DEC PY 1997 VL 33 IS 12 BP 2831 EP 2839 DI 10.1029/97WR02516 PG 9 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA YJ964 UT WOS:A1997YJ96400018 ER PT J AU Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF Piccioni, D Roff, DG Tapper, RJ Ameodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Jakubowski, Z Przybycien, MB Zachara, M Zawiejski, L Adamczyk, L Bednarek, B Bukowy, M Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Grosse-Knetter, J Haas, T Hain, W Hasell, D Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewski, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Park, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bromley, JT Brook, NH Bussey, PJ Doyle, AT Saxon, DH Sinclair, LE Strickland, E Utley, ML Waugh, R Wilson, AS Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, LK Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, TCBI Cole, JE Harris, VL Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Whitfield, AF Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Nakao, M Tokushuku, K Yamada, S Yamazaki, Y An, SH Lee, SB Nam, SW Park, HS Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Lim, JN Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Kooijman, P van Sighem, A Tiecke, H Tuning, N Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Harnew, N Lancaster, M McFall, JD Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F De Giorgi, M Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Zuin, F Bulmahn, J Feild, RG Oh, BY Okrasinski, JR Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Suzuki, I Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Yamauchi, K Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Sacchi, R Solano, A Stiano, A Dardo, M Bailey, DC Brkic, M Fagerstroem, CP Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sampson, CR Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Kaziewicz, PB Lane, JB Saunders, RL Shulman, J Sutton, MR Lu, B Mo, LW Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Revel, D Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB AF Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF Piccioni, D Roff, DG Tapper, RJ Ameodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Jakubowski, Z Przybycien, MB Zachara, M Zawiejski, L Adamczyk, L Bednarek, B Bukowy, M Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Grosse-Knetter, J Haas, T Hain, W Hasell, D Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewski, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Park, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bromley, JT Brook, NH Bussey, PJ Doyle, AT Saxon, DH Sinclair, LE Strickland, E Utley, ML Waugh, R Wilson, AS Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, LK Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, TCBI Cole, JE Harris, VL Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Whitfield, AF Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Nakao, M Tokushuku, K Yamada, S Yamazaki, Y An, SH Lee, SB Nam, SW Park, HS Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Lim, JN Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Kooijman, P van Sighem, A Tiecke, H Tuning, N Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Harnew, N Lancaster, M McFall, JD Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F De Giorgi, M Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Zuin, F Bulmahn, J Feild, RG Oh, BY Okrasinski, JR Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Suzuki, I Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Yamauchi, K Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Sacchi, R Solano, A Stiano, A Dardo, M Bailey, DC Brkic, M Fagerstroem, CP Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sampson, CR Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Kaziewicz, PB Lane, JB Saunders, RL Shulman, J Sutton, MR Lu, B Mo, LW Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Revel, D Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB TI Measurement of inelastic J/psi photoproduction at HERA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CENTRAL TRACKING DETECTOR; STRUCTURE-FUNCTION F-2(X,Q(2)); ZEUS BARREL CALORIMETER; LUND MONTE-CARLO; PARTON DISTRIBUTIONS; QCD ANALYSIS; J-PSI; GLUON DISTRIBUTION; PROTON; CONSTRUCTION AB We present a measurement of the inelastic, non diffractive J/psi photoproduction cross section in the reaction e(+)p --> e(+)J/psi X with the ZEUS detector at HERA, The J/psi was identified using both the mu(+)mu(-) and e(+)e(-) decay channels and events were selected within the range 0.4 < z < 0.9 (0.5 < z < 0.9) for the muon (electron) decay mode, where z is the fraction of the photon energy carried by the J/psi in the proton rest frame. The cross section, the p(T)(2) and the z distributions, after having subtracted the contributions from resolved photon and diffractive proton dissociative processes, are given for the photon-proton centre of mass energy range 50 < W < 180 GeV; p(T)(2) is the square of the J/psi transverse momentum with respect to the incoming proton beam direction. In the kinematic range 0.4 < z < 0.9 and p(T)2 > 1 GeV(2), NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data, The predictions of a specific leading order colour-octet. model, as formulated to describe the CDP data on J/psi hadroproduction, are not consistent with the data. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Andrews Univ, Berrien Springs, MI 49104 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, I-40126 Bologna, Italy. Univ Bonn, Inst Phys, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, I-87036 Cosenza, Italy. Ist Nazl Fis Nucl, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju, South Korea. Columbia Univ, Nevis Labs, Irvington, NY USA. Inst Phys Nucl, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Dept Phys, Krakow, Poland. DESY, D-2000 Hamburg, Germany. DESY, IFH Zeuthen, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany. KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan. Korea Univ, Seoul 136701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ H3A 2T5, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Phys Engn Inst, Moscow, Russia. Moscow MV Lomonosov State Univ, Inst Phys Nucl, Moscow, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Amsterdam, NL-1012 WX Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Oxford, Dept Phys, Oxford, England. Univ Padua, Dipartimento Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, Rome, Italy. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Fac Sci 2, Turin, Italy. INFN Alessandria, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA. Univ Warsaw, Inst Expt Phys, Warsaw, Poland. Inst Nucl Studies, PL-00681 Warsaw, Poland. Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. York Univ, Dept Phys, N York, ON M3J 1P3, Canada. CNR, IROE, I-50127 Florence, Italy. DESY, Hamburg, Germany. RP Breitweg, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Hernandez Calama, Jose Maria/H-9127-2015; Gladilin, Leonid/B-5226-2011; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Morandin, Mauro/A-3308-2016; Solomin, Anatoly/C-3072-2016; Bashkirov, Vladimir/A-4818-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Tassi, Enrico/K-3958-2015 OI Hernandez Calama, Jose Maria/0000-0001-6436-7547; Kasemann, Matthias/0000-0002-0429-2448; Arneodo, Michele/0000-0002-7790-7132; Abbiendi, Giovanni/0000-0003-4499-7562; Gladilin, Leonid/0000-0001-9422-8636; De Pasquale, Salvatore/0000-0001-9236-0748; Morandin, Mauro/0000-0003-4708-4240; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; NR 59 TC 45 Z9 45 U1 0 U2 3 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1997 VL 76 IS 4 BP 599 EP 612 DI 10.1007/s002880050583 PG 14 WC Physics, Particles & Fields SC Physics GA YM567 UT WOS:000071077700002 ER PT J AU Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Feld, L Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF Piccioni, D Roff, DG Tapper, RJ Arneodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Jakubowski, Z Przybycien, MB Zachara, M Zawiejski, L Adamczyk, L Bednarek, B Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Grosse-Knetter, J Haas, T Hain, W Hasell, D Johnson, KF Kasemann, E Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewsci, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Parks, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bohnet, I Brook, NH Bussey, PJ Doyle, AT Saxon, DH Sinclair, LE Strickland, E Utley, ML Waugh, R Wilson, AS Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, K Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, I Cole, JE Harris, VL Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Whitfield, AF Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Nakao, M Tokushuku, K Yamada, S Yamazaki, Y An, SH Lee, SB Nam, SW Park, HS Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Lim, JN Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Shumilin, AV Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Kooijman, P Kruse, A van Sighem, A Tiecke, H Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Harnew, N Lancaster, M McFall, JD Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Bulmahn, J Feild, RG Oh, BY Okrasinski, JR Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Doeker, T Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Suzuki, I Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Yamauchi, K Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Brkic, M Fagerstroem, CP Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sampson, CR Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Kaziewicz, PB Lane, JB Saunders, RL Shulman, J Sutton, MR Lu, B Mo, LW Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Revel, D Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, D Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB AF Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Feld, L Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF Piccioni, D Roff, DG Tapper, RJ Arneodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Jakubowski, Z Przybycien, MB Zachara, M Zawiejski, L Adamczyk, L Bednarek, B Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Grosse-Knetter, J Haas, T Hain, W Hasell, D Johnson, KF Kasemann, E Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewsci, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Parks, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bohnet, I Brook, NH Bussey, PJ Doyle, AT Saxon, DH Sinclair, LE Strickland, E Utley, ML Waugh, R Wilson, AS Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, K Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, I Cole, JE Harris, VL Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Whitfield, AF Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Nakao, M Tokushuku, K Yamada, S Yamazaki, Y An, SH Lee, SB Nam, SW Park, HS Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Lim, JN Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Shumilin, AV Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Kooijman, P Kruse, A van Sighem, A Tiecke, H Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Harnew, N Lancaster, M McFall, JD Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Bulmahn, J Feild, RG Oh, BY Okrasinski, JR Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Doeker, T Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Suzuki, I Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Yamauchi, K Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Brkic, M Fagerstroem, CP Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sampson, CR Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Kaziewicz, PB Lane, JB Saunders, RL Shulman, J Sutton, MR Lu, B Mo, LW Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Revel, D Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, D Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB TI A search for excited fermions in e(+)p collisions at HERA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; P(P)OVER-BAR COLLISIONS; LEPTON PRODUCTION; MONTE-CARLO; CONSTRUCTION; ELECTRON; EVENTS; DESIGN; COLLIDERS AB Using the ZEUS detector at HERA, we have searched for heavy excited states of electrons, neutrinos, and quarks in e(+)p collisions at a center-of-mass energy of 300 GeV, With an integrated luminosity of 9.4 pb(-1), no evidence was found for electroweak production and decay of such states, Limits on the production cross section times branching ratio and on the characteristic couplings, f/Lambda, are derived for masses up to 250 GeV. For the particular choice f/Lambda = 1/M-f*, we exclude at the 95% confidence level excited electrons with mass between 30 and 200 GeV, excited electron neutrinos with mass between 40 and 96 GeV, and quarks excited electroweakly with mass between 40 and 169 GeV. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Andrews Univ, Berrien Springs, MI 49104 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, I-40126 Bologna, Italy. Univ Bonn, Inst Phys, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, I-87036 Cosenza, Italy. Ist Nazl Fis Nucl, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju, South Korea. Columbia Univ, Nevis Labs, Irvington, NY USA. Inst Nucl Phys, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Dept Phys, Krakow, Poland. DESY, D-2000 Hamburg, Germany. DESY, IFH Zeuthen, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany. KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan. Korea Univ, Seoul 136701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ H3A 2T5, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Phys Engn Inst, Moscow, Russia. Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Amsterdam, NL-1012 WX Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Oxford, Dept Phys, Oxford, England. Univ Padua, Dipartimento Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, Rome, Italy. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Fac Sci 2, Turin, Italy. INFN Alessandria, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA. Univ Warsaw, Inst Expt Phys, Warsaw, Poland. Inst Nucl Studies, PL-00681 Warsaw, Poland. Weizmann Inst Sci, Dept Nucl Phys, IL-76100 Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. York Univ, Dept Phys, N York, ON M3J 1P3, Canada. CNR, IROE, I-50127 Florence, Italy. Univ Turin, Turin, Italy. DESY, Hamburg, Germany. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Hernandez Calama, Jose Maria/H-9127-2015; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Bashkirov, Vladimir/A-4818-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Tassi, Enrico/K-3958-2015; Morandin, Mauro/A-3308-2016; Solomin, Anatoly/C-3072-2016; Capua, Marcella/A-8549-2015; OI Hernandez Calama, Jose Maria/0000-0001-6436-7547; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Morandin, Mauro/0000-0003-4708-4240; Castellini, Guido/0000-0002-0177-0643; Kasemann, Matthias/0000-0002-0429-2448; Capua, Marcella/0000-0002-2443-6525; Arneodo, Michele/0000-0002-7790-7132; Abbiendi, Giovanni/0000-0003-4499-7562 NR 45 TC 21 Z9 21 U1 0 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1997 VL 76 IS 4 BP 631 EP 646 DI 10.1007/s002880050585 PG 16 WC Physics, Particles & Fields SC Physics GA YM567 UT WOS:000071077700004 ER PT J AU Asratyan, AE Aderholz, M Ammosov, VV Barth, M Bingham, HH Brucker, EB Burnstein, RA Chatterjee, TK Clayton, EC Ermolov, PF Erofeeva, IN Faulkner, PJW Gapienko, GS Guy, J Hanlon, J Harigel, G Ivanilov, AA Jain, V Jones, GT Jones, MD Kafka, T Kaftanov, VS Kalelkar, M Kohli, JM Korablev, VM Kubantsev, MA Lauko, M Lys, J Lyutov, SI Marage, P Milburn, RH Mittra, IS Morrison, DRO Moskalev, VI Murzin, VS Myatt, G Naon, R Passmore, D Peters, MW Rubin, H Sacton, J Schneps, J Singh, JB Singh, S Smart, W Stamer, P Vataga, ES Varvell, KE Venus, W Willocq, S AF Asratyan, AE Aderholz, M Ammosov, VV Barth, M Bingham, HH Brucker, EB Burnstein, RA Chatterjee, TK Clayton, EC Ermolov, PF Erofeeva, IN Faulkner, PJW Gapienko, GS Guy, J Hanlon, J Harigel, G Ivanilov, AA Jain, V Jones, GT Jones, MD Kafka, T Kaftanov, VS Kalelkar, M Kohli, JM Korablev, VM Kubantsev, MA Lauko, M Lys, J Lyutov, SI Marage, P Milburn, RH Mittra, IS Morrison, DRO Moskalev, VI Murzin, VS Myatt, G Naon, R Passmore, D Peters, MW Rubin, H Sacton, J Schneps, J Singh, JB Singh, S Smart, W Stamer, P Vataga, ES Varvell, KE Venus, W Willocq, S TI Production of D*(+)(2010) mesons by high energy neutrinos from the Tevatron SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CHARGED-CURRENT INTERACTIONS; BUBBLE-CHAMBER; DECAYS AB Charged vector D*(+)(2010) meson production is studied in a high energy neutrino bubble chamber experiment with mean neutrino energy of 141 GeV, The D*(+) are produced in (5.6+/-1.8)% of the neutrino charged current interactions, indicating a steep increase of cross section with energy. The mean fractional hadronic energy of the D*(+) meson is 0.55 +/- 0.06. C1 Inst Theoret & Expt Phys, RU-117259 Moscow, Russia. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Free Univ Brussels, Interuniv Inst High Energies, B-1050 Brussels, Belgium. CERN, CH-1211 Geneva 23, Switzerland. Punjab Univ, Chandigarh 160014, India. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Hawaii, Honolulu, HI 96822 USA. Inst High Energy Phys, RU-142284 Protvino, Moscow Region, Russia. IIT, Chicago, IL 60616 USA. Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. Univ Jammu, Jammu 180001, India. Max Planck Inst Phys, D-80805 Munich, Germany. Moscow State Univ, RU-119899 Moscow, Russia. Univ Oxford, Dept Nucl Phys, Oxford OX1 3RH, England. Rutgers State Univ, New Brunswick, NJ 08903 USA. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CENS, DPHPE, F-91191 Gif Sur Yvette, France. Stevens Inst Technol, Hoboken, NJ 07030 USA. Tufts Univ, Medford, MA 02155 USA. Kansas State Univ, Manhattan, KS 66503 USA. Seton Hall Univ, S Orange, NJ 07079 USA. RP Asratyan, AE (reprint author), Inst Theoret & Expt Phys, RU-117259 Moscow, Russia. NR 16 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1997 VL 76 IS 4 BP 647 EP 652 DI 10.1007/s002880050586 PG 6 WC Physics, Particles & Fields SC Physics GA YM567 UT WOS:000071077700005 ER PT J AU Finkel, RC Nishiizumi, K AF Finkel, RC Nishiizumi, K TI Beryllium 10 concentrations in the Greenland Ice Sheet Project 2 ice core from 3-40 ka SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID ATMOSPHERIC C-14; SOLAR MODULATION; TRACE-ELEMENTS; ANTARCTIC ICE; POLAR ICE; BE-10; DEPOSITION; RECORD; CALIBRATION; CLIMATE AB A nearly continuous record of Be-10 (half-life of 1.5 x 10(6) years) concentrations is reported in the Greenland Ice Sheet Project 2 (GISP2) ice core for the time period between 3288 and 40,055 years B.P. The resolution is between 20 and 50 years in the Holocene. During the Pleistocene, sampling was coarser, with the resolution ranging between 50 and 200 years. Both concentrations and fluxes are reported. Concentrations of Be-10 are observed to correlate strongly with delta(18)O and more weakly with snow accumulation rates. Beryllium 10 fluxes show less dependence than do concentrations on climate-related parameters. A good correlation exists between Delta(14)C and Be-10 for centennial scale variations, which are most likely due to heliomagnetic modulation of the lone production rate in the atmosphere. There is no evidence of a long-term geomagnetic effect on the Be-10 flux at GISP2. The interpretation of the record depends strongly on the model one uses to infer atmospheric Be-10 concentrations' from the measured concentrations in snow. C1 LAWRENCE LIVERMORE NATL LAB,GEOSCI & ENVIRONM TECHNOL DIV,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP Finkel, RC (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,7000 E AVE,LIVERMORE,CA 94550, USA. NR 42 TC 171 Z9 173 U1 0 U2 18 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD NOV 30 PY 1997 VL 102 IS C12 BP 26699 EP 26706 DI 10.1029/97JC01282 PG 8 WC Oceanography SC Oceanography GA YJ671 UT WOS:A1997YJ67100033 ER PT J AU Benites, RA Roberts, PM Yomogida, K Fehler, M AF Benites, RA Roberts, PM Yomogida, K Fehler, M TI Scattering of elastic waves in 2-D composite media .1. Theory and test SO PHYSICS OF THE EARTH AND PLANETARY INTERIORS LA English DT Article; Proceedings Paper CT Symposium on Stochastic Seismic Wave Fields and Realistic Media CY MAR 11-15, 1996 CL NEUSTADT, GERMANY SP Deut Forschungsgemein, Japanese Soc Promotion Sci DE earth's crust; seismic waves; cavities; coda waves ID INTRINSIC ATTENUATION; MULTIPLE-SCATTERING; CODA WAVES; SH-WAVES; SEPARATION; ENERGY; MODELS; SV AB dLocalised regions in the earth's crust exhibiting complex variations of density and seismic wave velocities can be represented by random distribution of cavities, in a manner described by Matsunami (1983) for two-dimensional (2-D) media. In order to study the multiple scattering of seismic waves propagating in such media, we develop an indirect boundary integral scheme with discretisation based on wave source distribution around The cavities. Numerical experiments using seven generic 2-D models and incident P, SV and SH plane waves, as well as el:plosive line sources, are carried out. These experiments are intended to both assess the accuracy of the method, and to examine the character of attenuation of the direct wave, coda waveforms, and travel time features that emerge from pure scattering (no intrinsic attenuation), computed in all cases for wavelengths comparable to the size of the heterogeneities. The wavefield computed for one cavity shows a remarkable diffracted wave that creeps around it, for all the incident waves, regardless of the shape of its cross-section. This wave contributes significantly to the multiple scattering caused by the direct and all reflected/converted waves in the presence of many cavities. For complex regions defined by random distribution of cavities, an explosive line source located below the region produces slight amplification of the horizontal component of the wavefield, apparently due to constructive interference, at observation points above the region, while the vertical component is strongly attenuated. The durations of the seismograms are about the same for observation points located towards both ends of tine region. These results appear to be reversed when the source is above the region. Ln this case, the horizontal component is strongly attenuated, and the duration of the seismograms is significantly larger at observation points on the side of the incidence than at the opposite side, suggesting the dominant effect of backscattering. The amplitudes of the multiple scattered phases, the attenuation of the direct wave and the duration of the seismograms, appear to be larger when the line source is very near or within the heterogeneous region, than when it is outside. For the same geometry of the scattering region, the seismograms appear to be more complex and amplitudes of multiple scattered phases larger for a plane SH wave in a half-space. (C) 1997 Elsevier Science B.V. C1 IGNS Geophys, Wellington, New Zealand. Los Alamos Natl Lab, Geoengn Grp, Los Alamos, NM 87545 USA. Hiroshima Univ, Dept Earth & Planetary Syst Sci, Hiroshima 739, Japan. RP IGNS Geophys, POB 1320, Wellington, New Zealand. RI Yomogida, Kiyoshi/A-4275-2012 NR 25 TC 16 Z9 16 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-9201 EI 1872-7395 J9 PHYS EARTH PLANET IN JI Phys. Earth Planet. Inter. PD NOV 30 PY 1997 VL 104 IS 1-3 BP 161 EP 173 DI 10.1016/S0031-9201(97)00096-4 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA YR291 UT WOS:000071480100012 ER PT J AU Yomogida, K Benites, R Roberts, PM Fehler, F AF Yomogida, K Benites, R Roberts, PM Fehler, F TI Scattering of elastic waves in 2-D composite media II. Waveforms and spectra SO PHYSICS OF THE EARTH AND PLANETARY INTERIORS LA English DT Article; Proceedings Paper CT Symposium on Stochastic Seismic Wave Fields and Realistic Media CY MAR 11-15, 1996 CL NEUSTADT, GERMANY SP Deut Forschungsgemein, Japanese Soc Promotion Sci DE scattering; frequency dependence; P-S conversion; cluster of cavities ID MULTIPLE-SCATTERING; SH-WAVES; CODA-Q; ATTENUATION; LITHOSPHERE; 3-COMPONENT; CRACKS AB The boundary integral representation of the complete seismic wavefield in two-dimensional composite media characterised by the distribution of many cavities (Paper I in this issue) is used to study the waveforms and spectra of the scattered wavefield for three models of media heterogeneity, upon the incidence of P and S plane waves and line sources. First, the case of one circular cavity and S primary waves shows that the scattered wavefield is composed mainly of S waves, and that S-P scattering can be ignored in any frequency ranee for all forward scattering angles (scattering angle theta measured clockwise with respect to the direction of propagation of the primary wave). The spectra of forward scattering computed for theta similar or equal to 0 degrees resemble the spectrum predicted by the Born approximation for acoustic or scalar waves for theta = 0 degrees: of small amplitudes for small values of non-dimensional frequency kd (k is the wavenumber and d is the cavity diameter), increasing with kd, up to kd similar or equal to 2, and becoming constant for larger values of kd. The spectra for backward scattering (theta similar or equal to 180 degrees) behave similarly, showing amplitudes as large as those computed for the forward cases. The non-isotropic pattern of scattering predicted by analytical solutions is also confirmed. In the case of P primary waves, P-S scattering appears to be significantly stronger than P-P scattering for most scattering angles, except for theta similar or equal to 0 degrees and theta similar or equal to 180 degrees. The computation of synthetic seismograms for models with many cavities show scattered waves of low frequency corresponding to wavelengths much larger than the size of the cavities, as well as those of high frequency due to multiple reflections and conversions at the boundaries of the cavities. A cluster of 20 cavities randomly distributed within a small region produces well-defined low frequency waves that appear to be associated with the presence of one low-velocity heterogeneous body, or soft inclusion, represented by the whole cluster. The case of 50 cavities randomly distributed within a horizontally extended region (of narrow thickness) shows coda-like wave arrivals, particularly strong in the horizontal component. Also in this case, nearly horizontally incident plane waves produce low frequency scattered waves of large amplitudes. It appears that while in the long-wavelength limit this model synthesises a coherent wave corresponding to reflection upon a horizontal interface, towards the short-wavelength limit the scattered waves show a rather complex, incoherent pattern immediately after the arrival of the incident wave, as if the region were a transitional zone of effective thickness. The analysis presented in this paper suggests that if the wavelengths are much larger than the size of the cavities, our representation of random media can he used to represent regional heterogeneity in the earth's crust, associated with observed seismic scattering phenomena. (C) 1997 Elsevier Science B.V. C1 Inst Geol & Nucl Sci, Wellington, New Zealand. Hiroshima Univ, Fac Sci, Dept Earth & Planetary Syst Sci, Higashihiroshima 739, Japan. Univ Calif Los Alamos Natl Lab, Geoengn Grp, Los Alamos, NM 87545 USA. RP Yomogida, K (reprint author), Inst Geol & Nucl Sci, POB 1320, Wellington, New Zealand. RI Yomogida, Kiyoshi/A-4275-2012 NR 32 TC 14 Z9 14 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-9201 J9 PHYS EARTH PLANET IN JI Phys. Earth Planet. Inter. PD NOV 30 PY 1997 VL 104 IS 1-3 BP 175 EP 192 DI 10.1016/S0031-9201(97)00054-X PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA YR291 UT WOS:000071480100013 ER PT J AU Bardeen, CJ Cerullo, G Shank, CV AF Bardeen, CJ Cerullo, G Shank, CV TI Temperature-dependent electronic dephasing of molecules in polymers in the range 30 to 300 K SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PHOTON-ECHO; ABSORPTION-SPECTROSCOPY; SOLVATION DYNAMICS; MODE SUPPRESSION; DYE MOLECULES; FEMTOSECOND; TRANSIENT; LIQUIDS; STATES; GLASS AB The ultrafast electronic dephasing of the molecules LD690 and LDS750 dissolved in amorphous polymer hosts is examined in the temperature range 30-300 K. The polarization decay time of LD690 in PMMA and PVA varies from about 40 fs at room temperature to 160 fs at 28 K, while the decay of LDS750 in PMMA is close to pulsewidth-limited at all temperatures. The difference between the dynamics observed in these two molecules shows how the molecular nature of the solute can affect the observed dephasing dynamics. (C) 1997 Published by Elsevier Science B.V. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy. RP Bardeen, CJ (reprint author), Univ Calif San Diego, Dept Chem 0339, La Jolla, CA 92093 USA. RI Cerullo, Giulio/F-6534-2011; OI Cerullo, Giulio/0000-0002-9534-2702 NR 35 TC 32 Z9 32 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 28 PY 1997 VL 280 IS 1-2 BP 127 EP 133 DI 10.1016/S0009-2614(97)01082-8 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YN622 UT WOS:000071188400020 ER PT J AU LeMaster, DM Springer, PA Unkefer, CJ AF LeMaster, DM Springer, PA Unkefer, CJ TI The role of the buried aspartate of Escherichia coli thioredoxin in the activation of the mixed disulfide intermediate SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID ACTIVE-SITE CYSTEINE; BOND FORMATION; CRYSTAL-STRUCTURE; ISOMERASE; RESIDUES; CATALYSIS; DSBA; RESOLUTION; REACTIVITY; IONIZATION AB The structurally homologous protein disulfide isomerases and thioredoxins exhibit a 10(5) variation of redox equilibria. It is demonstrated that the kinetic distinction among these protein family members lies primarily in the rate of breakdown of the mixed disulfide intermediate, The conserved buried acid group serves as a proton transfer catalyst for the buried active site cysteine in the formation and breakdown of the mixed disulfide, The reduction rats of Escherichia coli thioredoxin by dithiothreitol is directly proportional to the fraction of Asp-26 in the protonated farm over the pH range of 6-9. The kinetic role of Asp-26 is further probed via differential solvent kinetic isotope effect measurements versus a D26N variant, The differential solvent isotope effect of 0.6 is consistent with a direct proton donation to the thiolate leaving group (Cys-35) via an enforced general acid catalysis by trapping mechanism, Such a donation necessitates a structural rearrangement as these two buried side chains are separated by 6 Angstrom in both the oxidized and reduced forms of the protein. RP LeMaster, DM (reprint author), LOS ALAMOS NATL LAB,CHEM SCI & TECHNOL GRP 4,POB 1663,LOS ALAMOS,NM 87545, USA. NR 33 TC 35 Z9 36 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD NOV 28 PY 1997 VL 272 IS 48 BP 29998 EP 30001 DI 10.1074/jbc.272.48.29998 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH613 UT WOS:A1997YH61300005 PM 9374473 ER PT J AU Nunomura, W Takakuwa, Y Tokimitsu, R Krauss, SW Kawashima, M Mohandas, N AF Nunomura, W Takakuwa, Y Tokimitsu, R Krauss, SW Kawashima, M Mohandas, N TI Regulation of CD44-protein 4.1 interaction by Ca2+ and calmodulin - Implications for modulation of CD44-ankyrin interaction SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID MEMBRANE SKELETAL PROTEIN-4.1; ERYTHROCYTE ANION-EXCHANGER; SPECTRIN-ACTIN BINDING; PLASMA-MEMBRANE; ANKYRIN-BINDING; TRANSMEMBRANE GLYCOPROTEIN; OPTICAL BIOSENSOR; RESONANT MIRROR; GLYCOPHORIN-C; CELLS AB Erythrocyte membrane skeletal protein 4.1 isoforms have been identified in a variety of non-erythroid cells. However, interactions between protein 4.1 and its binding partners in non-erythroid cell membranes are poorly understood. In the erythrocyte membrane, protein 4.1 binds to the cytoplasmic domain of band 3 and, through this interaction, modulates ankyrin binding to band 3. The sequences LRRRY or IRRRY in band 3 mediate the interaction between band 3 and protein 4.1. The cytoplasmic domain of CD44, a transmembrane glycoprotein found in erythroid as well. as non-erythroid cells, has internal sequences SRRRC and QKKKL. We wanted to determine if protein 4.1 binds to CD44 in a fashion analogous to its binding to band 3 and through this interaction modulates ankyrin binding to CD44, We report here that protein 4.1 binds to the cytoplasmic domain of CD44 with a dissociation constant on the order of 10(-7) M and that Ca2+ and calmodulin reduce the affinity of this interaction Furthermore, although independent binding of both protein 4.1 and ankyrin to CD44 could be documented, binding of protein 4.1 prevented subsequent ankyrin binding These studies have enabled us to identify a potentially important functional role for protein 4.1 in modulating ankyrin binding to CD44. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. TOKYO WOMENS MED COLL,DEPT BIOCHEM,SHINJUKU KU,TOKYO 162,JAPAN. TOKYO WOMENS MED COLL,DEPT DERMATOL,SHINJUKU KU,TOKYO 162,JAPAN. FU NHLBI NIH HHS [HL31579]; NIDDK NIH HHS [DK26263, DK32094] NR 54 TC 103 Z9 105 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD NOV 28 PY 1997 VL 272 IS 48 BP 30322 EP 30328 DI 10.1074/jbc.272.48.30322 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH613 UT WOS:A1997YH61300051 PM 9374519 ER PT J AU Sega, GA Tomkins, BA Griest, WH AF Sega, GA Tomkins, BA Griest, WH TI Analysis of methylphosphonic acid, ethyl methylphosphonic acid and isopropyl methylphosphonic acid at low microgram per liter levels in groundwater SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE warfare agents; methylphosphonic acids ID MASS-SPECTROMETRY; DEGRADATION PRODUCTS; GAS-CHROMATOGRAPHY; BIOLOGICAL SAMPLES AB A method is described for determining methylphosphonic acid, ethyl methylphosphonic acid and isopropyl methylphosphonic acid, which are hydrolysis products of the nerve agents VX (S-2-diisopropylaminoethyl O-ethyl methyl phosphonothiolate) and GB (sarin, isopropylmethyl phosphonofluoridate). The analytes are extracted from 50 mi groundwater using a solid-phase extraction column packed with 500 mg of silica with a bonded quaternary amine phase, and are eluted and derivatized with methanolic trimethylphenylammonium hydroxide. Separation and quantitation are achieved using a capillary column gas chromatograph equipped with a flame photometric detector operated in its phosphorus-selective mode. Two independent statistically-unbiased procedures were employed to determine the detection limits, which ranged between 3 and 9 mu g/l, for the three analytes. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Organ Chem Sect, Oak Ridge, TN 37831 USA. RP Tomkins, BA (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Organ Chem Sect, POB 2008, Oak Ridge, TN 37831 USA. OI Tomkins, Bruce/0000-0001-8520-1415 NR 21 TC 57 Z9 59 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD NOV 28 PY 1997 VL 790 IS 1-2 BP 143 EP 152 DI 10.1016/S0021-9673(97)00747-4 PG 10 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA YL693 UT WOS:000070982700015 PM 9435117 ER PT J AU Kelly, JA Lee, CS AF Kelly, JA Lee, CS TI On-line post-capillary affinity detection of immunoglobulin G subclasses and monoclonal antibody variants for capillary electrophoresis SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE affinity detection; detection, electrophoresis; protein heterogeneity; immunoglobulins; monoclonal antibodies; proteins ID PROTEIN-A; IGG; GLYCOSYLATION; COMPLEMENT AB Human immunoglobulin G (IgG) subclasses each play a unique role in an immune response to foreign antigens. Three of the human IgG subclasses have distinct electrophoretic mobilities and are resolved by capillary zone electrophoresis (CZE). A post-capillary reactor is constructed to allow on-line addition of fragment B (of protein A)-fluorescein to form affinity complexes with separated IgG subclasses. Post-capillary affinity detection provides selective identification of human IgG subclasses and illustrates the effect of affinity binding constant on detection sensitivity. Additionally, post-capillary affinity detection for CZE facilitates rapid and selective heterogeneity analysis of mouse monoclonal anti-(human-alpha(1)-antitrypsin) and anti-human follicle stimulating hormone in complex sample matrices. A constant mobility difference is observed between the antibody isoforms, likely the result of charge heterogeneity due to deamination, degradation or variation in sialic acid content. (C) 1997 Elsevier Science B.V. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. RP Lee, CS (reprint author), Iowa State Univ, Dept Chem, Gilman Hall, Ames, IA 50011 USA. NR 19 TC 12 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD NOV 28 PY 1997 VL 790 IS 1-2 BP 207 EP 214 DI 10.1016/S0021-9673(97)00760-7 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA YL693 UT WOS:000070982700022 PM 9435121 ER PT J AU Benham, C KohwiShigematsu, T Bode, J AF Benham, C KohwiShigematsu, T Bode, J TI Stress-induced duplex DNA destabilization in scaffold/matrix attachment regions SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE scaffold-attached regions; nuclear scaffold; chromatin domain; DNA duplex stability; DNA superhelicity ID CELL-SPECIFIC DEMETHYLATION; CHROMOSOMAL LOOP ANCHORAGE; SUPPRESSOR SITES FLANKING; MATRIX-ASSOCIATED REGION; INTERFERON GENE-CLUSTER; HEAVY-CHAIN ENHANCER; NUCLEAR-MATRIX; SUPERHELICAL DNA; BINDING-PROTEIN; SUPERCOILED DNA AB S/MARs are DNA elements 300 to several thousand base-pairs long, which are operationally defined by their affinity for the nuclear scaffold or matrix. S/MARs occur exclusively in eukaryotic genomes, where they mediate several functions. Because S/MARs do not have a clearcut consensus sequence, the characteristics that define their activity are thought to be structural. Ubiquitous S/MAR binding proteins have been identified, but to date no unique binding sequence or structural motif has been found. Here we show by computational analysis that S/MARs conform to a specific design whose essential attribute is the presence of stress-induced base-unpairing regions (BURs). Stress-induced destabilization (SIDD) profiles are calculated using a previously developed statistical mechanical procedure in which the superhelical deformation is partitioned between strand separation, twisting within denatured regions, and residual superhelicity. The results of these calculations show that BURs exhibit a succession of evenly spaced destabilized sites that would render part or all of the S/MAR sequence single stranded at sufficient superhelicity. These analyses are performed for a range of sequenced S/MAR elements from the borders of eukaryotic gene domains, from centromeres, and from positions where S/MARs are known to support the action of an enhancer. The results reported here are in excellent agreement with earlier in vitro chemical reactivity studies. This approach demonstrates the potential for computational analysis to predict the points of division of the eukaryotic genome into functional units (domains), and also to locate certain cis-regulatory sequences. (C) 1997 Academic Press Limited. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. GESELL BIOTECHNOL FORSCH MBH,GENEREGULAT DIFFERNEZIERUNG GENET EUKARYONTEN,D-38124 BRAUNSCHWEIG,GERMANY. RP Benham, C (reprint author), CUNY MT SINAI SCH MED,DEPT BIOMATH SCI,BOX 1023,1 GUSTAVE LEVY PL,NEW YORK,NY 10029, USA. RI Benham, Craig/G-1512-2013 NR 78 TC 109 Z9 114 U1 0 U2 2 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD NOV 28 PY 1997 VL 274 IS 2 BP 181 EP 196 DI 10.1006/jmbi.1997.1385 PG 16 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YK496 UT WOS:A1997YK49600005 PM 9398526 ER PT J AU Zetner, PW Trajmar, S Wang, S Kanik, I Csanak, G Clark, REH Abdallah, J Nickel, JC AF Zetner, PW Trajmar, S Wang, S Kanik, I Csanak, G Clark, REH Abdallah, J Nickel, JC TI Inelastic electron scattering by laser-excited Ba-138( ... 6s6p P-1(1)) atoms SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID IMPACT COHERENCE PARAMETERS; CROSS-SECTIONS; SUPERELASTIC SCATTERING; NEUTRAL BARIUM; EXCITATION; ORIENTATION; TRANSITION; ALIGNMENT; SODIUM; LEVEL AB We present experimental and theoretical results of an investigation into low-energy electron scattering from Ba-138 atoms coherently prepared in the (...6s6p)P-l(1) state by laser excitation. We measured the differential cross section from the coherently prepared (...6s6p)P-1(1) state (referred to as partial differential cross section) for excitations of the (...5d(2))P-3(2), (...6p5d)F-1(3), (...6s6d)D-1(2), (...6s7p)P-1(1), (...6s8s)S-3(1), and (...6s8d)D-1(2) levels at E-o = 20 eV and 36.7 eV incident electron energies and compared them with theoretical results obtained from unitarized distorted wave approximation calculations. In some cases (e.g, the excitation of D-1(2) and P-1(1) levels) there is reasonable or good agreement between theory and experiment, in other cases (e.g, the excitation of the P-3(2) and S-3, levels) there are order of magnitude (or more) differences. C1 CALTECH,JET PROP LAB,PASADENA,CA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. RP Zetner, PW (reprint author), UNIV MANITOBA,DEPT PHYS,WINNIPEG,MB R3T 2N2,CANADA. NR 61 TC 22 Z9 22 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL, ENGLAND BS1 6BE SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 28 PY 1997 VL 30 IS 22 BP 5317 EP 5339 DI 10.1088/0953-4075/30/22/026 PG 23 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YK156 UT WOS:A1997YK15600026 ER PT J AU Gifford, AN Tang, YJ Gatley, SJ Volkow, ND Lan, RX Makriyannis, A AF Gifford, AN Tang, YJ Gatley, SJ Volkow, ND Lan, RX Makriyannis, A TI Effect of the cannabinoid receptor SPECT agent, AM 281, on hippocampal acetylcholine release from rat brain slices SO NEUROSCIENCE LETTERS LA English DT Article DE cannabinoid receptor; marijuana; acetylcholine; hippocampus; SPECT AB The SPECT ligand AM 281, a less lipophilic analog of the cannabinoid receptor antagonist SR 141716A, robustly potentiated electrically-evoked release of acetylcholine from superfused hippocampal slices and prevented the inhibition of acetylcholine release by the cannabimimetic drug WIN 55212-2. These results, similar to earlier observations with SR 141716A, indicate that AM 281 is either a cannabinoid receptor antagonist or inverse agonist. Despite showing lower affinity than SR 141716A in hippocampal membrane binding experiments, AM 281 had slightly greater potency than SR 141716A in the hippocampal slice experiments, perhaps because of reduced drug absorption to slice membranes and to the apparatus. (C) 1997 Elsevier Science Ireland Ltd. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Connecticut, Sch Pharm, Storrs, CT 06269 USA. Univ Connecticut, Dept Mol & Cell Biol, Storrs, CT 06269 USA. RP Gifford, AN (reprint author), Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. NR 9 TC 54 Z9 54 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3940 J9 NEUROSCI LETT JI Neurosci. Lett. PD NOV 28 PY 1997 VL 238 IS 1-2 BP 84 EP 86 DI 10.1016/S0304-3940(97)00851-3 PG 3 WC Neurosciences SC Neurosciences & Neurology GA YP383 UT WOS:000071271400022 PM 9464661 ER PT J AU Linderoth, NA Simon, MN Russel, M AF Linderoth, NA Simon, MN Russel, M TI The filamentous phage pIV multimer visualized by scanning transmission electron microscopy SO SCIENCE LA English DT Article ID GRAM-NEGATIVE BACTERIA; OUTER-MEMBRANE PROTEIN; SECRETION; EXPORT; CHANNELS; PATHWAY; PORINS; FORMS AB A family of homomultimeric outer-membrane proteins termed secretins mediates the secretion of large macromolecules such as enzymes and filamentous bacteriophages across bacterial outer membranes to the extracellular milieu. The secretin encoded by done filamentous phage fl was purified. Mass determination of individual molecules by scanning transmission electron microscopy revealed two forms, a unit multimer composed of about 14 subunits and a multimer dimer. The secretin is roughly cylindrical and has an internal diameter of about 80 angstroms, which is large enough to accommodate filamentous phage (diameter of 65 angstroms). C1 ROCKEFELLER UNIV,NEW YORK,NY 10021. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU PHS HHS [P41-4401777] NR 30 TC 117 Z9 118 U1 0 U2 3 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 28 PY 1997 VL 278 IS 5343 BP 1635 EP 1638 DI 10.1126/science.278.5343.1635 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ874 UT WOS:A1997YJ87400045 PM 9374466 ER PT J AU Kato, S Ackerman, TP Clothiaux, EE Mather, JH Mace, GG Wesely, ML Murcray, F Michalsky, J AF Kato, S Ackerman, TP Clothiaux, EE Mather, JH Mace, GG Wesely, ML Murcray, F Michalsky, J TI Uncertainties in modeled and measured clear-sky surface shortwave irradiances SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID REFLECTANCE MEASUREMENTS; SCATTERING ATMOSPHERES; RADIANCE CALCULATIONS; SIZE DISTRIBUTIONS; RADIATIVE FLUXES; AEROSOLS; PHOTODISSOCIATION; POLARIZATION; CLIMATE; RATES AB A comparison of five independent measurements of the clear-sky downward shortwave irradiance at the surface shows that they scatter within a 5% range depending on their calibration constants. When the measurements are corrected using data from two cavity radiometers, three of the five independent measurements agree within 3 W m(-2) over three clear-sky days, which is well within the estimated error limit of +/-1.5%. A comparison of these three sets of irradiance measurements with the computed irradiance by a delta 2-stream model reveals that the model overestimates the irradiance by 5%. Detailed investigation of the approximations and uncertainties associated with the computations (including the measurement error in the water vapor and ozone amounts, neglecting the state of polarization and trace gas absorption, the 2-stream approximation, the neglect of the spectral dependence of the surface albedo, and the uncertainties associated with aerosols) demonstrates that the discrepancy is not due to these approximations. Further analysis of the modeled and measured irradiance shows that the discrepancy is almost entirely due to the difference between modeled and measured diffuse field irradiances. An analysis of narrow-band diffuse to total irradiance ratios shows that this discrepancy is the largest near 400 nm and decreases with wavelength. These results rely on the absolute calibrations of two cavity radiometers, two shaded pyranometers, and one unshaded pyranometer, as well as ratios of irradiances measured by a multifilter rotating shadow-band radiometer. Therefore, in order for instrumental error to account for the diffuse field discrepancy, three independent measurements of the diffuse held irradiance must be biased low by at least 40%. For an aerosol to account for this discrepancy, it must be highly absorbing with a single-scattering albedo as low as 0.3. The unlikelihood of instrumental errors of 40% and aerosol single-scattering albedos of 0.3 suggests a third possibility: the neglect of some gaseous absorption process at visible wavelengths. C1 SUNY ALBANY, ATMOSPHER SCI RES CTR, ALBANY, NY 12205 USA. UNIV DENVER, DEPT PHYS RES, DENVER, CO 80208 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP Kato, S (reprint author), PENN STATE UNIV, DEPT METEOROL, 503 WALKER BLDG, UNIVERSITY PK, PA 16802 USA. NR 44 TC 134 Z9 137 U1 1 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 27 PY 1997 VL 102 IS D22 BP 25881 EP 25898 DI 10.1029/97JD01841 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA YH593 UT WOS:A1997YH59300013 ER PT J AU Smith, J Phillips, J Graham, A Steele, R Redondo, A Coons, J AF Smith, J Phillips, J Graham, A Steele, R Redondo, A Coons, J TI Homogeneous chemistry in lean-burn exhaust mixtures SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID SELECTIVE REDUCTION; NITRIC-OXIDE; CATALYTIC REDUCTION; NITROGEN MONOXIDE; ZEOLITES; HYDROCARBONS; COMBUSTION; OXIDATION; OXYGEN; NO AB The search for catalysts capable of reducing NOx in the exhaust of internal combustion engines operated in the lean-burn mode is presently focused on copper-exchanged zeolites. Despite intensive study, the mechanism of reduction over these catalysts is not well understood. In this study new complications are revealed. Specifically, it is demonstrated in a typical synthetic exhaust stream (containing hydrocarbons and oxygen) NO is rapidly, and in some cases nearly completely, homogeneously (no catalyst present) converted to NO2. Under some conditions N2O is also formed. It is also shown that most of the hydrocarbons are homogeneously oxidized in these same streams in the temperature range in which lean-burn catalysts are expected to operate. These processes only take place in gas mixtures containing both hydrocarbons and oxygen. Moreover, the extent of NO conversion to NO2 is shown to be a function of temperature, the hydrocarbon to NO ratio of the input stream, the input CO concentration, and flow rate. In short, homogeneous chemistry is in some cases a significant factor in catalytic NOx reduction. C1 PENN STATE UNIV,DEPT CHEM ENGN,FENSKE LAB 133,UNIVERSITY PK,PA 16802. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. RI Coons, Jim/G-5159-2011; Phillips, Jonathan/D-3760-2011 NR 26 TC 7 Z9 7 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 27 PY 1997 VL 101 IS 48 BP 9157 EP 9162 DI 10.1021/jp9716647 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YK289 UT WOS:A1997YK28900025 ER PT J AU Hodges, MP Stone, AJ Xantheas, SS AF Hodges, MP Stone, AJ Xantheas, SS TI Contribution of many-body terms to the energy for small water clusters: A comparison of ab initio calculations and accurate model potentials SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID PERTURBATION-THEORY; MOLECULAR-DYNAMICS; LIQUID WATER; BASIS-SETS; TRIMER; HYDROGEN; SPECTRA; DIMERS; REARRANGEMENTS; WAVEFUNCTIONS AB We have tested the ability of two new model potentials constructed using intermolecular perturbation theory methods to reproduce ab initio results at a comparable level of theory. Several configurations of water trimer, tetramer, and pentamer are studied, and in addition to the contributions to the interaction energy, the potential energy surfaces are compared by optimizing the model potential geometries to local stationary points within a rigid-body framework. In general the agreement between the two methods is good, validating the model potentials as suitable candidates for providing starting geometries for further ab initio calculations and for the simulation of larger systems. C1 UNIV CAMBRIDGE, CHEM LAB, CAMBRIDGE CB2 1EW, ENGLAND. PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; Stone, Anthony/M-8040-2015; OI Stone, Anthony/0000-0002-3846-245X; Xantheas, Sotiris/0000-0002-6303-1037 NR 45 TC 170 Z9 172 U1 0 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 27 PY 1997 VL 101 IS 48 BP 9163 EP 9168 DI 10.1021/jp9716851 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YK289 UT WOS:A1997YK28900026 ER PT J AU Eppler, AS Rupprechter, G Guczi, L Somorjai, GA AF Eppler, AS Rupprechter, G Guczi, L Somorjai, GA TI Model catalysts fabricated using electron beam lithography and pulsed laser deposition SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID SINGLE-CRYSTAL SURFACES; METAL PARTICLES; NAY-ZEOLITE; CLUSTERS; PLATINUM; XPS; PD; REDUCIBILITY; PALLADIUM; GROWTH AB Supported metal nanoparticles have been fabricated using electron beam lithography (EEL) and pulsed laser deposition (PLD). EEL produced ordered two-dimensional arrays with particle diameters of 40 +/- 0.5 nm, uniform interparticle distances (230 +/- 2 nm), and uniform height (20 +/- 0.5 nm). Due to the narrow size distribution of the particles and the long-range (cm(2)) order, the arrays produced using EBL were applied as models for supported metal catalysts. Smaller particle sizes can be obtained using PLD, but with larger size and spatial distributions of the particles. Particles fabricated with PLD have mean sizes ranging from 2 to 50 nm, depending on the ambient pressure during deposition. The nanoparticles have been characterized using TEM, AFM, UPS, and SEM. Reaction studies of ethylene hydrogenation on Pt nanoparticle arrays have demonstrated that detectable amounts of ethane are produced, despite the low surface area of the model catalysts. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. HUNGARIAN ACAD SCI, INST ISOTOPES, DEPT SURFACE CHEM & CATALYSIS, H-1525 BUDAPEST, HUNGARY. NR 49 TC 81 Z9 81 U1 2 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 27 PY 1997 VL 101 IS 48 BP 9973 EP 9977 DI 10.1021/jp972818l PG 5 WC Chemistry, Physical SC Chemistry GA YK290 UT WOS:A1997YK29000016 ER PT J AU Gonzales, NO Bell, AT Chakraborty, AK AF Gonzales, NO Bell, AT Chakraborty, AK TI Density functional theory calculations of the effects of local composition and defect structure on the proton affinity of H-ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MOLECULAR-ORBITAL METHODS; ACID SITES; BASIS SETS; NMR-SPECTROSCOPY; ZEOLITE ACIDITY; HYDROXYL-GROUPS; SILANOL GROUPS; ZSM-5; ALUMINUM; DEALUMINATION AB Density functional theory has been used to determine the effects of local composition and structure oil the proton affinity (PA) of H-ZSM-5. These calculations were performed with clusters ranging in size from 34 to 41 atoms. For isolated Al sites, the associated PA is 329 kcal/mol. Introduction of a defect in the form of a silanol group immediately adjacent to such a Bronsted acid site reduces the PA to 316 kcal/mol. For an isolated structure containing two Al atoms in nest-nearest-neighbor T sites, the value of PA lies between 330 and 298 kcal/mol, depending on the location of the two charge-compensating cations, and is not affected by the presence of a silanol group on the Si atom situated between the two Al atoms, However, the presence of a trigonally coordinated Si atom immediately adjacent to the Bronsted acid site reduces the PA dramatically to 281 kcal/mol, but the presence of trigonally coordinated Al in the vicinity of a Bronsted acid site has no effect on the value of PA. However, the presence of an extraframework Lewis acid center in the form of Al=O+ will lower the PA for a proton associated with one of the Al atoms in a structure containing two next-nearest-neighbor Al atoms, to 305 kcal/mol. Defects situated on Al atoms have PAs lying between 338 and 320 kcal/mol. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 42 TC 41 Z9 41 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 27 PY 1997 VL 101 IS 48 BP 10058 EP 10064 DI 10.1021/jp971449q PG 7 WC Chemistry, Physical SC Chemistry GA YK290 UT WOS:A1997YK29000028 ER PT J AU Watson, JN Iton, LE Keir, RI Thomas, JC Dowling, TL White, JW AF Watson, JN Iton, LE Keir, RI Thomas, JC Dowling, TL White, JW TI TPA-silicalite crystallization from homogeneous solution: Kinetics and mechanism of nucleation and growth SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MOLECULAR-SIEVE SYNTHESIS; ANGLE NEUTRON-SCATTERING; X-RAY; ZEOLITE; CRYSTAL; TPA-SILICALITE-1 AB The formation and growth of tetrapropylammonium-templated crystal nuclei of silicalite from a clear homogeneous solution was recorded in situ as a function of time at temperatures between 90 and 115 degrees C using small-angle X-ray scattering (SAXS), The kinetics of the nucleation process was studied and give an apparent activation energy of 70 kJ mol(-1). A small-angle neutron scattering (SANS) contrast variation study confirms that the nuclei contain the tetrapropylammonium template in the expected stoichiometry of the completed crystal, Infrared spectroscopy provides evidence that the silicalite framework structure is present in the nuclei. Our SAXS and SANS data both show that a cylindrical form factor gave the best fit to the measured scattering functions for the particles that developed from nucleation to the end of the induction period, Dynamic light scattering measurements were used to follow the crystal growth in the 100-6000 Angstrom size domain, beyond the range of the SAXS measurements. Scanning electron microscopy was also used to determine crystal morphology and particle sizes of sedimented crystals and freeze-dried solutions. We have proposed a detailed model for the nucleation and crystallization processes wherein cylindrical primary nuclei, 2 x 2 unit cells in Gross section, form very quickly upon heating and then assemble end-to-end along the crystal c axis into 330 Angstrom long primary crystallites during an extended induction period, followed by the aggregation of the primary crystallites into polycrystalline ellipsoids of length 6000 Angstrom. C1 AUSTRALIAN NATL UNIV, RES SCH CHEM, CANBERRA, ACT 0200, AUSTRALIA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. UNIV S AUSTRALIA, SCH PHYS & ELECT SYST ENGN, ADELAIDE, SA 5001, AUSTRALIA. RI Thomas, John/D-1259-2011 OI Thomas, John/0000-0001-8966-5014 NR 25 TC 136 Z9 136 U1 4 U2 49 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 27 PY 1997 VL 101 IS 48 BP 10094 EP 10104 DI 10.1021/jp971531l PG 11 WC Chemistry, Physical SC Chemistry GA YK290 UT WOS:A1997YK29000033 ER PT J AU Dohrmann, CR Segalman, DJ AF Dohrmann, CR Segalman, DJ TI Use of quadratic components for buckling calculations SO JOURNAL OF SOUND AND VIBRATION LA English DT Letter ID ROTATING FLEXIBLE STRUCTURES; DYNAMICS RP Dohrmann, CR (reprint author), SANDIA NATL LABS,STRUCT DYNAM DEPT,ORG 9234,MAIL STOP 0439,ALBUQUERQUE,NM 87185, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD NOV 27 PY 1997 VL 208 IS 2 BP 339 EP 344 DI 10.1006/jsvi.1997.1180 PG 6 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA YK468 UT WOS:A1997YK46800012 ER PT J AU Rayner, S Malone, EL AF Rayner, S Malone, EL TI Zen and the art of climate maintenance SO NATURE LA English DT Editorial Material RP Rayner, S (reprint author), PACIFIC NW NATL LAB,SUITE 900,901 D ST SW,WASHINGTON,DC 20024, USA. NR 1 TC 27 Z9 27 U1 2 U2 6 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 27 PY 1997 VL 390 IS 6658 BP 332 EP 334 DI 10.1038/36975 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YH549 UT WOS:A1997YH54900028 ER PT J AU Klenk, HP Clayton, RA Tomb, JF White, O Nelson, KE Ketchum, KA Dodson, RJ Gwinn, M Hickey, EK Peterson, JD Richardson, DL Kerlavage, AR Graham, DE Kyrpides, NC Fleischmann, RD Quackenbush, J Lee, NH Sutton, GG Gill, S Kirkness, EF Dougherty, BA McKenney, K Adams, MD Loftus, B Peterson, S Reich, CI McNeil, LK Badger, JH Glodek, A Zhou, LX Overbeek, R Gocayne, JD Weidman, JF McDonald, L Utterback, T Cotton, MD Spriggs, T Artiach, P Kaine, BP Sykes, SM Sadow, PW DAndrea, KP Bowman, C Fujii, C Garland, SA Mason, TM Olsen, GJ Fraser, CM Smith, HO Woese, CR Venter, JC AF Klenk, HP Clayton, RA Tomb, JF White, O Nelson, KE Ketchum, KA Dodson, RJ Gwinn, M Hickey, EK Peterson, JD Richardson, DL Kerlavage, AR Graham, DE Kyrpides, NC Fleischmann, RD Quackenbush, J Lee, NH Sutton, GG Gill, S Kirkness, EF Dougherty, BA McKenney, K Adams, MD Loftus, B Peterson, S Reich, CI McNeil, LK Badger, JH Glodek, A Zhou, LX Overbeek, R Gocayne, JD Weidman, JF McDonald, L Utterback, T Cotton, MD Spriggs, T Artiach, P Kaine, BP Sykes, SM Sadow, PW DAndrea, KP Bowman, C Fujii, C Garland, SA Mason, TM Olsen, GJ Fraser, CM Smith, HO Woese, CR Venter, JC TI The complete genome sequence of the hyperthermophilic, sulphate-reducing archaeon Archaeoglobus fulgidus SO NATURE LA English DT Article ID MONOXIDE DEHYDROGENASE PATHWAY; ARCHAEBACTERIA; OXIDOREDUCTASE; CO2; OXIDATION; BACTERIA; PROTEIN; ENZYME AB Archaeoglobus fulgidus is the first sulphur-metabolizing organism to have its genome sequence determined. Its genome of 2,178,400 base pairs contains 2,436 open reading frames (ORFs). The Information processing systems and the biosynthetic pathways for essential components (nucleotides, amino acids and cofactors) have extensive correlation with their counterparts in the archaeon Methanococcus jannaschii. The genomes of these two Archaea indicate dramatic differences in the way these organisms sense their environment, perform regulatory and transport functions, and gain energy. In contrast to M. jannaschii, A. fulgidus has fewer restriction-modification systems, and none of its genes appears to contain inteins. A quarter (651 ORFs) of the A. fulgidus genome encodes functionally uncharacterized yet conserved proteins, two-thirds of which are shared with M. jannaschii (428 ORFs). Another quarter of the genome encodes new proteins indicating substantial archaeal gene diversity. C1 INST GENOM RES TIGR,ROCKVILLE,MD 20850. UNIV ILLINOIS,DEPT MICROBIOL,CHAMPAIGN,IL 61801. ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RI Graham, David/F-8578-2010; Kyrpides, Nikos/A-6305-2014; OI Graham, David/0000-0001-8968-7344; Kyrpides, Nikos/0000-0002-6131-0462; Fraser, Claire/0000-0003-1462-2428 NR 43 TC 1114 Z9 2155 U1 4 U2 48 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 27 PY 1997 VL 390 IS 6658 BP 364 EP & PG 15 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YH549 UT WOS:A1997YH54900052 PM 9389475 ER PT J AU Budai, JD White, CW Withrow, SP Chisholm, MF Zhu, J Zuhr, RA AF Budai, JD White, CW Withrow, SP Chisholm, MF Zhu, J Zuhr, RA TI Controlling the size, structure and orientation of semiconductor nanocrystals using metastable phase recrystallization SO NATURE LA English DT Article ID CADMIUM SELENIDE NANOCRYSTALS; CLUSTERS; SAPPHIRE; ALUMINA; GROWTH; SIO2 AB Materials engineering at the nanometre scale should provide smaller technological devices than are currently available(1,2). In particular, research on semiconductor nanostructures with size-dependent optical and electronic properties is motivated by potential applications which include quantum-dot lasers and high-speed nonlinear optical switches(3,4). Here we describe an approach for controlling the size, orientation and lattice structure of semiconductor nanocrystals embedded in a transparent matrix. We form nanocrystalline precipitates by implanting ions of the semiconductor into a single-crystal alumina substrate and applying thermal annealing(5-7). Control over the microstructure of the nanocrystals is achieved using substrate amorphization and recrystallization. In essence, the substrate microstructure is manipulated using ion beams to induce changes in impurity solubility, crystal symmetry and cation bonding, which exert a profound influence on the microstructure of the embedded precipitates-a concept familiar in metallurgy(8). This approach can be extended to exercise control over virtually any type of precipitate (such as metals, insulators or magnetic clusters) as well as epitaxial thin films. RP Budai, JD (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 21 TC 91 Z9 94 U1 2 U2 27 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 27 PY 1997 VL 390 IS 6658 BP 384 EP 386 DI 10.1038/37079 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YH549 UT WOS:A1997YH54900057 ER PT J AU Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC CHristenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JOffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK KLatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinely, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P da Motta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amidi, E Amos, N Anderson, EW Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC CHristenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, M Fatyga, MK Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Grim, G Grinstein, S Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY JOffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK KLatchko, A Klima, B Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Lander, R Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinely, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P da Motta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoianova, DA Stoker, D Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A TI Color coherent radiation in multijet events from p(p)over-bar collisions at root s=1.8 TeV SO PHYSICS LETTERS B LA English DT Article ID E+E ANNIHILATION; 3-JET EVENTS; QCD COHERENCE; MODELS; FRAGMENTATION; ENERGY; JETS; GLUONS; DECAYS; TESTS AB We report on a study of color coherence effects in p (p) over bar collisions at a center of mass energy root(s) = 1.8 TeV. The data were collected with the D detector during the 1992-1993 run of the Fermilab Tevatron Collider. We observe the presence of initial-to-final state color interference with the spatial correlations between soft and hard jets in multijet events in the central and in forward pseudorapidity regions. The results are compared to Monte Carlo simulations with different color coherence implementations and to the predictions of C(alpha(s)(3)) QCD calculations. (C) 1997 Elsevier Science B.V. C1 NYU, New York, NY 10003 USA. Univ Los Andes, Bogota, Colombia. Univ Arizona, Tucson, AZ 85721 USA. Boston Univ, Boston, MA 02215 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Brown Univ, Providence, RI 02912 USA. Univ Buenos Aires, Buenos Aires, DF, Argentina. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. CINVESTAV, Mexico City 14000, DF, Mexico. Columbia Univ, New York, NY 10027 USA. Univ Delhi, Delhi 110007, India. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Univ Illinois, Chicago, IL 60607 USA. Indiana Univ, Bloomington, IN 47405 USA. Iowa State Univ, Ames, IA 50011 USA. Korea Univ, Seoul 136701, South Korea. Kyungsung Univ, Pusan 608736, South Korea. Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Moscow State Univ, Moscow, Russia. Univ Nebraska, Lincoln, NE 68588 USA. Northeastern Univ, Boston, MA 02115 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Univ Oklahoma, Norman, OK 73019 USA. Panjab Univ, Chandigarh 160014, India. Protvino High Energy Phys Inst, Protvino 142284, Russia. Purdue Univ, W Lafayette, IN 47907 USA. Rice Univ, Houston, TX 77005 USA. Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil. Univ Rochester, Rochester, NY 14627 USA. CEA, DAPNIA, Serv Phys Particules, CE SACLAY, Gif Sur Yvette, France. Seoul Natl Univ, Seoul, South Korea. SUNY Stony Brook, Stony Brook, NY 11794 USA. Tata Inst Fundamental Res, Colaba 400005, Mumbai, India. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. RP Abbott, B (reprint author), NYU, New York, NY 10003 USA. RI Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Belyaev, Alexander/F-6637-2015; Gutierrez, Phillip/C-1161-2011; Roe, Natalie/A-8798-2012; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013 OI Kim, Sun Kee/0000-0002-0013-0775; Sznajder, Andre/0000-0001-6998-1108; Aihara, Hiroaki/0000-0002-1907-5964; Belyaev, Alexander/0000-0002-1733-4408; Dudko, Lev/0000-0002-4462-3192; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; NR 33 TC 18 Z9 18 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 NOV 27 PY 1997 VL 414 IS 3-4 BP 419 EP 427 DI 10.1016/S0370-2693(97)01190-8 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM438 UT WOS:000071063500022 ER PT J AU Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castelini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF McFall, JD Piccioni, D Roff, DG Tapper, RJ Arneodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Figiel, J Klimek, K Przybycien, MB Zawiejski, L Adamczyk, L Bednarek, B Bukowy, M Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Haas, T Hain, W Hasell, D Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewski, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Park, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bromley, JT Brook, NH Bussey, PJ Doyle, AT Macdonald, N Saxon, DH Sinclair, LE Strickland, E Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, LK Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, I Cole, JE Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Suzuki, I Tokushuku, K Yamada, S Yamauchi, K Yamazaki, Y Hong, SJ Lee, SB Nam, SW Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Koffeman, E Kooijman, P van Sighem, A Tiecke, H Tuning, N Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Grosse-Knetter, J Harnew, N Lancaster, M Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Bulmahn, J Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Lane, JB Saunders, RL Shulman, J Sutton, MR Wing, M Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB AF Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, RL Yoshida, R Zhang, H Mattingly, MCK Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castelini, G Cifarelli, L Cindolo, F Contin, A Corradi, M De Pasquale, S Gialas, I Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Ricci, F Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Eckert, M Grothe, M Hartmann, H Heinloth, K Heinz, L Hilger, E Jakob, HP Katz, UF Kerger, R Paul, E Pfeiffer, M Rembser, C Stamm, J Wedemeyer, R Wieber, H Bailey, DS Campbell-Robson, S Cottingham, WN Foster, B Hall-Wilton, R Hayes, ME Heath, GP Heath, HF McFall, JD Piccioni, D Roff, DG Tapper, RJ Arneodo, M Ayad, R Capua, M Garfagnini, A Iannotti, L Schioppa, M Susinno, G Kim, JY Lee, JH Lim, IT Pac, MY Caldwell, A Cartiglia, N Jing, Z Liu, W Mellado, B Parsons, JA Ritz, S Sampson, S Sciulli, F Straub, PB Zhu, Q Borzemski, P Chwastowski, J Eskreys, A Figiel, J Klimek, K Przybycien, MB Zawiejski, L Adamczyk, L Bednarek, B Bukowy, M Jelen, K Kisielewska, D Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Zajac, J Dulinski, Z Kotanski, A Abbiendi, G Bauerdick, LAT Behrens, U Beier, H Bienlein, JK Cases, G Deppe, O Desler, K Drews, G Fricke, U Gilkinson, DJ Glasman, C Gottlicher, P Haas, T Hain, W Hasell, D Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Labs, J Lindemann, L Lohr, B Lowe, M Manczak, O Milewski, J Monteiro, T Ng, JST Notz, D Ohrenberg, K Park, IH Pellegrino, A Pelucchi, F Piotrzkowski, K Roco, M Rohde, M Roldan, J Ryan, JJ Savin, AA Schneekloth, U Selonke, F Surrow, B Tassi, E Voss, T Westphal, D Wolf, G Wollmer, U Youngman, C Zarnecki, AF Zeuner, W Burow, BD Grabosch, HJ Meyer, A Schlenstedt, S Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Eisenhardt, S Markun, P Trefzger, T Wolfle, S Bromley, JT Brook, NH Bussey, PJ Doyle, AT Macdonald, N Saxon, DH Sinclair, LE Strickland, E Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Gladilin, LK Horstmann, D Kcira, D Klanner, R Lohrmann, E Poelz, G Schott, W Zetsche, F Bacon, TC Butterworth, I Cole, JE Howell, G Hung, BHY Lamberti, L Long, KR Miller, DB Pavel, N Prinias, A Sedgbeer, JK Sideris, D Mallik, U Wang, SM Wu, JT Cloth, P Filges, D Fleck, JI Ishii, T Kuze, M Suzuki, I Tokushuku, K Yamada, S Yamauchi, K Yamazaki, Y Hong, SJ Lee, SB Nam, SW Park, SK Barreiro, F Fernandez, JP Garcia, G Graciani, R Hernandez, JM Hervas, L Labarga, L Martinez, M del Peso, J Puga, J Terron, J de Troconiz, JF Corriveau, F Hanna, DS Hartmann, J Hung, LW Murray, WN Ochs, A Riveline, M Stairs, DG St-Laurent, M Ullmann, R Tsurugai, T Bashkirov, V Dolgoshein, BA Stifutkin, A Bashindzhagyan, GL Ermolov, PF Golubkov, YA Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Zotkin, SA Bokel, C Botje, M Brummer, N Chlebana, F Engelen, J Koffeman, E Kooijman, P van Sighem, A Tiecke, H Tuning, N Verkerke, W Vossebeld, J Vreeswijk, M Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Nylander, P Romanowski, TA Blaikley, HE Cashmore, RJ Cooper-Sarkar, AM Devenish, RCE Edmonds, JK Grosse-Knetter, J Harnew, N Lancaster, M Nath, C Noyes, VA Quadt, A Ruske, O Tickner, JR Uijterwaal, H Walczak, R Waters, DS Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Voci, C Bulmahn, J Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Raso, M Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Rahn, JT Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Schwarzer, O Walenta, AH Abramowicz, H Briskin, G Dagan, S Kananov, S Levy, A Abe, T Fusayasu, T Inuzuka, M Nagano, K Umemori, K Yamashita, T Hamatsu, R Hirose, T Homma, K Kitamura, S Matsushita, T Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Petrucci, MC Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Hartner, GF Joo, KK Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Teuscher, RJ Butterworth, JM Catterall, CD Jones, TW Lane, JB Saunders, RL Shulman, J Sutton, MR Wing, M Ciborowski, J Grzelak, G Kasprzak, M Muchorowski, K Nowak, RJ Pawlak, JM Pawlak, R Tymieniecka, T Wroblewski, AK Zakrzewski, JA Adamus, M Coldewey, C Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Dasu, S Foudas, C Loveless, RJ Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wodarczyk, M Bhadra, S Frisken, WR Khakzad, M Schmidke, WB TI Observation of scaling violations in scaled momentum distributions at HERA SO PHYSICS LETTERS B LA English DT Article ID CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; FRAGMENTATION FUNCTIONS; E+E-ANNIHILATION; MASS-ENERGY; QCD; PROTON; CONSTRUCTION; DESIGN; SCATTERING AB Charged particle production has been measured in deep inelastic scattering (DIS) events over a large range of x and Q(2) using the ZEUS detector. The evolution of the scaled momentum, x(p), with Q(2), in the range 10 to 1280 GeV2, has been investigated in the current fragmentation region of the Breit frame. The results show clear evidence, in a single experiment, for scaling violations in scaled momenta as a function of Q(2). (C) 1997 Elsevier Science B.V. C1 CNR, IROE, I-50127 Florence, Italy. Argonne Natl Lab, Argonne, IL 60439 USA. Andrews Univ, Berrien Springs, MI 49104 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, Bologna, Italy. Univ Bonn, Inst Phys, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju, South Korea. Columbia Univ, Nevis Labs, Irvington, NY USA. Inst Nucl Phys, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Dept Phys, Krakow, Poland. DESY, Hamburg, Germany. Univ Turin, Turin, Italy. DESY, D-2000 Hamburg, Germany. DESY, IFH, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Ist Nazl Fis Nucl, Cosenza, Italy. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Expt Phys 1, D-2000 Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Imperial Coll London, High Energy Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Forschungszentrum Julich, Inst Kernphys, Julich, Germany. Natl Lab High Energy Phys, KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 305, Japan. Korea Univ, Seoul 136701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Phys Engn Inst, Moscow, Russia. Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Amsterdam, Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Oxford, Dept Phys, Oxford OX1 2JD, England. Univ Padua, Dept Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dept Fis, Rome, Italy. Ist Nazl Fis Nucl, Rome, Italy. Rutherford Appleton Lab, Chilton, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany. Tel Aviv Univ, Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Fac Sci 2, Alessandria, Italy. Ist Nazl Fis Nucl, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Univ Warsaw, Inst Expt Phys, Warsaw, Poland. Inst Nucl Studies, PL-00681 Warsaw, Poland. Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. York Univ, Dept Phys, N York, ON M3J 1P3, Canada. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Gladilin, Leonid/B-5226-2011; Bashkirov, Vladimir/A-4818-2008; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Wing, Matthew/C-2169-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Hernandez Calama, Jose Maria/H-9127-2015; Tassi, Enrico/K-3958-2015; Morandin, Mauro/A-3308-2016; Solomin, Anatoly/C-3072-2016; Capua, Marcella/A-8549-2015; OI Gladilin, Leonid/0000-0001-9422-8636; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Hernandez Calama, Jose Maria/0000-0001-6436-7547; Morandin, Mauro/0000-0003-4708-4240; Bailey, David C/0000-0002-7970-7839; Ricci, Fulvio/0000-0001-5475-4447; Castellini, Guido/0000-0002-0177-0643; Kasemann, Matthias/0000-0002-0429-2448; Capua, Marcella/0000-0002-2443-6525; Arneodo, Michele/0000-0002-7790-7132; Lancaster, Mark/0000-0002-8872-7292; Abbiendi, Giovanni/0000-0003-4499-7562; Graciani Diaz, Ricardo/0000-0001-7166-5198 NR 53 TC 27 Z9 27 U1 0 U2 3 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 NOV 27 PY 1997 VL 414 IS 3-4 BP 428 EP 443 DI 10.1016/S0370-2693(97)01194-5 PG 16 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM438 UT WOS:000071063500023 ER PT J AU Chlopecka, A Adriano, DC AF Chlopecka, A Adriano, DC TI Influence of zeolite, apatite and Fe-oxide on Cd and Pb uptake by crops SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article DE cadmium; lead; zeolite; apatite; Fe-rich ID CONTAMINATED SOILS; SOUTHWEST POLAND; SEWAGE SLUDGES; CADMIUM; LEAD; ZINC; PLANTS; BIOAVAILABILITY; INACTIVATION; METALS AB Natural zeolite (clinoptilolite), hydroxyapatite and an iron-oxide waste by-product (Fe-rich(TM), a trademark name of E.I. du Pont de Nemours) were added to an artificially contaminated Appling soil to immobilize and limit the uptake of metals by crops. A greenhouse pot study employed spiking the soil with Cd and Pb from metal flue dust. Maize (Zea mays) and barley (Hordeum vulgare) were planted in 7-kg potted soil to determine the effects of Cd and Pb on plant growth and uptake. Sequential extraction of soil indicates the substantial influence of soil pH and type of ameliorant on the chemical form and bioavailability of the metals. Data indicates that a dose of 50 g/kg of soil of iron-oxide appears to be very effective, based on the yields, metal contents of plant tissues and available forms of Cd and Pb in the soil. Lower doses of zeolite and apatite (15 g/kg and 4 g/kg soil, respectively) in most cases also reduced significantly the uptake of Cd and Pb by crops. (C) 1997 Elsevier Science B.V. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Chlopecka, A (reprint author), Univ Georgia, Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 36 TC 78 Z9 93 U1 1 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-9697 J9 SCI TOTAL ENVIRON JI Sci. Total Environ. PD NOV 27 PY 1997 VL 207 IS 2-3 BP 195 EP 206 DI 10.1016/S0048-9697(97)00268-4 PG 12 WC Environmental Sciences SC Environmental Sciences & Ecology GA YP500 UT WOS:000071283800013 PM 9447748 ER PT J AU Luecke, HF Bergman, RG AF Luecke, HF Bergman, RG TI Synthesis and C-H activation reactions of cyclometalated complexes of Ir(III): Cp*(PMe3)Ir(CH3)(+) does not undergo intermolecular C-H activation in solution via a cyclometalated intermediate SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTRON-TRANSFER CATALYSIS; IRIDIUM COMPLEXES; BOND ACTIVATION; METHANE; INSERTION; RHENIUM C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 20 TC 57 Z9 57 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 NOV 26 PY 1997 VL 119 IS 47 BP 11538 EP 11539 DI 10.1021/ja972340z PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA YH773 UT WOS:A1997YH77300025 ER PT J AU Grgur, BN Markovic, NM Ross, PN AF Grgur, BN Markovic, NM Ross, PN TI Underpotential deposition of lead on Pt(111) in perchloric acid solution: RRDPt(111)E measurements SO LANGMUIR LA English DT Letter ID SCANNING-TUNNELING-MICROSCOPY; SINGLE-CRYSTAL SURFACES; X-RAY-SCATTERING; AUGER-SPECTROSCOPY; LOW-INDEX; COPPER; ELECTRODEPOSITION; ADSORPTION; PLATINUM(111); ANIONS AB Underpotential deposition (UPD) of lead (Pb-upd) on Pt(111) in perchloric acid solution was studied using the rotation ring disk, electrode (RRDPt(111)E) method for measurements of the Pb2+ ion-specific flux. The total amount of Pb deposited underpotentially is 0.62 +/- 5% monolayer (1 monolayer = 1 Pb per Pt) equivalent to a close-packed monolayer of fully discharged Pb adatoms. The electrosorption valence, gamma(Pb), of Pb-upd is approximate to gamma(Pb) = 2, implying that two electrons per Pb-upd adatom are exchanged through the interface. In this work we showed that the formation of this close-packed monolayer of Pb-upd occurs through four distinctive voltammetric features: two major sharp peaks at approximate to 0.5 V (vs saturated calomel electrode) and 0.3 V and smaller reversible peaks at 0 V and -0.15 V. We concluded that the adsorption of OHad is shifted negatively by Pb-upd adatoms, with the shift attributed to induced adsorption of OHad onto Pt atoms neighboring the Pb-upd adatoms due to lowering of the local point of zero charge (pcz) by the Pb-upd. Consequently, the pH dependence of the Pb UPD peak at 0.3 V appears entirely through a pH-dependent adsorption of OHad onto the Pt(111) surface modified by Pb-upd adatoms. The pH independence of the peak at 0.5 V is consistent with the Pb2+ ion-flux measurements that the main process associated with this pseudocapacitance is Pb UPD. The smaller peaks observed at lower potentials are probably associated with a final deposition of Pb-upd adatoms along step edges and compacting of adatoms on the (111)-terraces to form an ordered (3 x root 3) close-packed structure. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. OI Grgur, Branimir/0000-0003-4684-9053 NR 23 TC 24 Z9 24 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD NOV 26 PY 1997 VL 13 IS 24 BP 6370 EP 6374 DI 10.1021/la970699v PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA YJ331 UT WOS:A1997YJ33100008 ER PT J AU Lio, A Reichert, A Ahn, DJ Nagy, JO Salmeron, M Charych, DH AF Lio, A Reichert, A Ahn, DJ Nagy, JO Salmeron, M Charych, DH TI Molecular imaging of thermochromic carbohydrate-modified polydiacetylene thin films SO LANGMUIR LA English DT Article ID LANGMUIR-BLODGETT-FILMS; RESONANCE RAMAN-SPECTROSCOPY; ORDER-DISORDER TRANSITIONS; PHASE-TRANSITION; INFLUENZA-VIRUS; SIALIC-ACID; MONOLAYERS; POLYMERIZATION; POLY(DIACETYLENES); LIPOSOMES AB Polymerized thin films based on polydiacetylenes (PDAs) undergo distinct color transitions that lend themselves to applications in biosensing, surface modification, nonlinear optics, and molecular electronics. The mechanism of the thermochromic blue to red color transition of PDA thin films was investigated at the molecular level using atomic force microscopy and at the macroscopic level with visible absorption and Fourier transform infrared spectroscopy. The thermochromic transition temperature is found to be between 70 and 90 degrees C. At the molecular level, the ordering of the film increases at the thermochromic transition and remains ordered up to temperatures well above the transition (e.g., 130 degrees C). No evidence for previously suggested entanglement or disordering of the alkyl side chains is observed. The pendant side chains rearrange from a partially disordered configuration characteristic of the blue film, to a well-ordered close-packed hexagonal arrangement in the red form. The rearrangment of the pendant side chains is linked to the formation of the red phase PDA. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. KOREA UNIV, DEPT CHEM ENGN, SEOUL 136701, SOUTH KOREA. NR 43 TC 108 Z9 109 U1 3 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD NOV 26 PY 1997 VL 13 IS 24 BP 6524 EP 6532 DI 10.1021/la970406y PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA YJ331 UT WOS:A1997YJ33100032 ER PT J AU Durbin, MK Malik, A Richter, AG Huang, KG Dutta, P AF Durbin, MK Malik, A Richter, AG Huang, KG Dutta, P TI In-situ X-ray diffraction study of Langmuir-Blodgett deposition SO LANGMUIR LA English DT Article ID PHASE-TRANSITION; DOCOSANOIC ACID; MONOLAYERS AB We have built a Langmuir-Blodgett (LB) deposition trough that mounts onto a Huber 4-circle diffractometer, so that the LB substrate and the water are in the same closed, temperature-controlled environment. We have used this system to study Langmuir-Blodgett films just after transfer using synchrotron X-ray diffraction. We were able to deposit from the L-2, L-2', S, and RII phases of a fatty acid monolayer, and observe the same structures in the transferred monolayers. Three of these phases have not been observed before on a glass substrate. Once deposited, the LB monolayer structure was not affected either by pressure changes in the water monolayer (when part of the substrate was still immersed) or by the substrate remaining in contact with the water or not. The structures were stable over time but changed irreversibly under the effects of radiation damage and temperature cycling. These results show that the change from the structure observed on water to the final LB structure does not occur during deposition, but long afterward. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP Durbin, MK (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 15 TC 10 Z9 10 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 NOV 26 PY 1997 VL 13 IS 24 BP 6547 EP 6549 DI 10.1021/la970872n PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA YJ331 UT WOS:A1997YJ33100035 ER PT J AU Sanchez, J Quinn, DP Tringides, MC AF Sanchez, J Quinn, DP Tringides, MC TI The use of the Boltzmann-Matano analysis in two-dimensional concentration profiles SO SURFACE SCIENCE LA English DT Article DE interacting systems; scaling; surface diffusion ID INDUCED THERMAL-DESORPTION; SURFACE-DIFFUSION; COVERAGE DEPENDENCE; HYDROGEN AB We have examined the use of the Boltzmann-Matano method to analyze two-dimensional concentration profiles and extract diffusion coefficients D(c). First, this method requires showing that the scaling condition c(x,t)=c(x/root t) holds, where c(x,t) is the concentration at position x and time t. Diffusion coefficients can be extracted either with the Boltzmann-Matano method or from the time dependence of the interface width w. We show that even for very weakly coverage-dependent D(c) (i.e. D=1 or D(c)=2D(1)(c/c(0))(1-c/c(0))) the scaling condition is not satisfied because the finite amount enclosed by the patch is not sufficient to maintain the shape of the profile as it spreads outside the patch region. This implies the failure of the method will be more dramatic for other forms of D(c). If diffusion coefficients are extracted using the Boltzmann-Matano formula and the time dependence of the interface width, their values are smaller than the ones used as inputs in the simulation. (C) 1997 Elsevier Science B.V. C1 IOWA STATE UNIV,AMES LAB,AMES,IA 50011. UNIV NACL MAR DEL PLATA,DEPT PHYS,MAR DEL PLATA,ARGENTINA. IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. NR 8 TC 7 Z9 7 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 NOV 26 PY 1997 VL 391 IS 1-3 BP 101 EP 108 DI 10.1016/S0039-6028(97)00460-3 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK652 UT WOS:A1997YK65200027 ER PT J AU Gierer, M Barbieri, A VanHove, MA Somorjai, GA AF Gierer, M Barbieri, A VanHove, MA Somorjai, GA TI Structural reanalysis of the Rb(111)+(root 3x root 3)R30 degrees-CO and Rh(111)+(2x2)-3CO phases using automated tensor LEED SO SURFACE SCIENCE LA English DT Article DE carbon monoxide; chemisorption; electron-solid interactions; scattering; diffraction; low energy electron diffraction LEED); low index single crystal surfaces; rhodium; surface chemical reaction; surface relaxation and reconstruction; surface structure, morphology, roughness, and topography; vibrations of adsorbed molecules ID ENERGY ELECTRON-DIFFRACTION; SIMULTANEOUS BRIDGE; DYNAMICAL LEED; CO; SURFACE; ADSORPTION; RH(111); CHEMISORPTION; RU(0001) AB The structures of Rh(111)+(root 3 x root 3)R30-CO and Rh(111)+(2 x 2)-3CO have been reanalyzed using automated tensor LEED. In accordance with the result of an earlier LEED analysis: the CO molecules were found to occupy top sites in Rh(111)+ (root 3 x root 3)R30-CO; for the topmost substrate layer, a buckling is non determined, with the Rh atom underneath CO being pulled out by 0.08 Angstrom. In the (2 x 2)-3CO structure, the CO molecules are found to occupy top sites and three-fold hollow sites, in contrast to results of an earlier LEED analysis. These findings are in line with recent core electron spectroscopy experiments, but are at odds with earlier conclusions from vibrational spectroscopy where assignment was made to top and bridge sites. Together with other metal-CO and metal-NO systems described in the literature, the Rh(111)+(2 x 2)-3CO phase demonstrates that great care has to be taken in adsorption site assignment using the C-O and N-O stretch frequencies. (C) 1997 Elsevier Science B.V. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 20 TC 69 Z9 70 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 26 PY 1997 VL 391 IS 1-3 BP 176 EP 182 DI 10.1016/S0039-6028(97)00480-9 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK652 UT WOS:A1997YK65200034 ER PT J AU Ma, Q Rosenberg, RA AF Ma, Q Rosenberg, RA TI Interaction of Al clusters with the (0001) surface of highly oriented pyrolytic graphite SO SURFACE SCIENCE LA English DT Letter DE adatom-induced surface reconstruction; aluminum; chemical reaction; HOPG; soft X-ray photoelectron spectroscopy ID SCANNING-TUNNELING-MICROSCOPY; X-RAY PHOTOEMISSION; ABSORPTION FINE-STRUCTURE; AUGER LINE-SHAPE; ATOMIC-STRUCTURE; BASAL-PLANE; ALUMINUM; GOLD; CHEMISORPTION; SPECTRA AB Interfacial reaction of Al clusters with the (0001) surface of highly oriented pyrolytic graphite (HOPG) was examined using soft X-ray photoelectron spectroscopy. Clusters were deposited at 300, 573 and 773 K. The most striking observation is that no chemical reaction occurs at any temperature. Reactions were only observed if the surface integrity was compromised. This may indicate that upon deposition of Al, there is littler if any, adatom-induced surface reconstruction on the HOPG surface. This result should resolve discrepancies that have arisen in previous experimental and theoretical studies. (C) 1997 Elsevier Science B.V. C1 ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RI Rosenberg, Richard/K-3442-2012 NR 38 TC 21 Z9 21 U1 1 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 26 PY 1997 VL 391 IS 1-3 BP L1224 EP L1229 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK652 UT WOS:A1997YK65200011 ER PT J AU Swan, AK Shi, ZP Wendelken, JF Zhang, ZY AF Swan, AK Shi, ZP Wendelken, JF Zhang, ZY TI Flux-dependent scaling behavior in Cu(100) submonolayer homoepitaxy SO SURFACE SCIENCE LA English DT Letter DE copper; low energy electron diffraction (LEED); low index single crystal surface; scanning tunneling microscopy (STM); surface diffusion; surface structure ID BY-LAYER GROWTH; MOLECULAR-BEAM EPITAXY; MEDIATED ISLAND GROWTH; CLUSTER MOBILITY; THIN-FILMS; NUCLEATION; DIFFUSION; SURFACES; SIZES; DISSOCIATION AB The average separation of two-dimensional islands in Cu(100) submonolayer homoepitaxy as a function of the deposition flux at 213K has been studied using spot profile analysis low-energy electron diffraction. As the flux decreases, a large change in the apparent critical island size; from one to a value between seven and 12 atoms, is obtained even though the temperature is held constant. This is shown to be consistent with a recently proposed dimer shearing mechanism which has a significant influence on the stability of islands with eight atoms or less. (C) 1997 Elsevier Science B.V. RP Swan, AK (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. NR 34 TC 21 Z9 21 U1 5 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 26 PY 1997 VL 391 IS 1-3 BP L1205 EP L1211 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK652 UT WOS:A1997YK65200008 ER PT J AU Lee, AL Volkman, BF Robertson, SA Rudner, DZ Barbash, DA Cline, TW Kanaar, R Rio, DC Wemmer, DE AF Lee, AL Volkman, BF Robertson, SA Rudner, DZ Barbash, DA Cline, TW Kanaar, R Rio, DC Wemmer, DE TI Chemical shift mapping of the RNA-binding interface of the multiple-RBD protein sex-lethal SO BIOCHEMISTRY LA English DT Article ID SMALL NUCLEAR RIBONUCLEOPROTEIN; HUMAN U1A PROTEIN; HNRNP-C-PROTEINS; CRYSTAL-STRUCTURE; SECONDARY STRUCTURE; MAGNETIC-RESONANCE; TRANSFORMER GENE; DNA-BINDING; IN-VITRO; DOMAIN AB The Drosophila protein Sex-lethal (Sx1) contains two RNP consensus-type RNA-binding domains (RBDs) separated by a short linker sequence. Both domains are essential for high-affinity binding to the single-stranded polypyrimidine tract (PPT) within the regulated 3' splice site of the transformer (tra) pre-mRNA. In this paper, the effect of RNA binding to a protein fragment containing both RBDs from Sx1 (Sx1-RBD1+2) has been characterized by heteronuclear NMR. Nearly complete (85-90%) backbone resonance assignments have been obtained for unbound and RNA-bound states of Sx1-RBD1+2. A comparison of amide H-1 and N-15 chemical shifts between free and bound states has highlighted residues which respond to RNA binding. The beta-sheets in both RBDs (RBD1 and RBD2) form an RNA interaction surface, as has been observed in other RBDs. A significant number of residues display different behavior when comparing RBD1 and RBD2. This argues for a model in which RBD1 and RBD2 of Sx1 have different or nonanalogous points of interaction with the tra PPT. R-142 (in RBD2) exhibits the largest chemical shift change upon RNA binding. The role of R-142 in RNA binding was tested by measuring the K-d of a mutant of Sx1-RBD1+2 in which R-142 was replaced by alanine. This mutant lost the ability to bind RNA, showing a correlation with the chemical. shift difference data. The RNA-binding affinities of two other mutants, F(146)A and (TI)-I-138, were also shown to correlate with the NMR observations. C1 UNIV CALIF BERKELEY,DEPT MOL & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV WISCONSIN,DEPT BIOCHEM,MADISON,WI 53706. UNIV WISCONSIN,NATL MAGNET RESONANCE FACIL,MADISON,WI 53706. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,STRUCT BIOL DIV,BERKELEY,CA 94720. FU NCRR NIH HHS [RR02301]; NICHD NIH HHS [HD 28063] NR 50 TC 42 Z9 41 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 NOV 25 PY 1997 VL 36 IS 47 BP 14306 EP 14317 DI 10.1021/bi970830y PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH566 UT WOS:A1997YH56600005 PM 9398148 ER PT J AU Mao, B Gorin, A Gu, ZT Hingerty, BE Broyde, S Patel, DJ AF Mao, B Gorin, A Gu, ZT Hingerty, BE Broyde, S Patel, DJ TI Solution structure of the aminofluorene-intercalated conformer of the syn [AF]-C-8-dG adduct opposite a -2 deletion site in the NarI hot spot sequence context SO BIOCHEMISTRY LA English DT Article ID SINGLE ACETYLAMINOFLUORENE ADDUCT; 2 INTERCHANGEABLE CONFORMATIONS; SALMONELLA-TYPHIMURIUM HISD3052; INDUCED FRAMESHIFT MUTAGENESIS; RESTRAINED MOLECULAR-DYNAMICS; DNA DUPLEX; ESCHERICHIA-COLI; CARCINOGEN N-2-ACETYLAMINOFLUORENE; PROPANODEOXYGUANOSINE OPPOSITE; COMPUTATIONAL CHARACTERIZATION AB This paper addresses structural issues related to the capacity of aminofluorene [AF] for frameshift mutations of the -2 type on C-8 covalent adduct formation at the G(3) site in the d(C-G(1)-G(2)-C-G(3)-C-C) NarI hot spot sequence. This problem has been approached from a combined NMR and relaxation matrix analysis computational structural study of the [AF]dG adduct in the d(C-G-G-C-[AF]G-C-C).d(G-G-C-C-G) sequence context at the 12/10-mer adduct level (designated [AF]dG.del(-2) 12/10-mer). The proton spectra of this system are of exceptional quality and are consistent with the formation of an AF-intercalated conformer with the modified guanine in a syn alignment displaced along with the 5'-flanking cytosine residue into the major groove. The solution structure has been determined by initially incorporating intramolecular and intermolecular proton-proton distances defined by lower and upper bound deduced from NOESY spectra as restraints in molecular mechanics computations in torsion angle space and subsequently refined through restrainted molecular dynamics calculations based on a NOE distance and intensity refinement protocol. Strikingly, the [AF]dG.del(-2) 12/10-mer duplex adopts only one of two potential AF-intercalation alignments for the [AF]dG adduct opposite the -2 deletion site in the NarI sequence context with the extrusion of the dC-[AF]dG step favored completely over extrusion of the [AF]dG-dC step at the lesion site. This polarity establishes that the structural perturbation extends 5' rather than 3' to the [AF]dG lesion site in the adduct duplex. This structure of the [AF]dG adduct opposite a -2 deletion site shows distinct differences with conclusions reported on the alignment of the related acetylaminofluorene [AAF]dG adduct opposite a -2 deletion site in the identical NarI sequence context [Milhe, C., Fuchs, R. P. P., and Lefevre, J. F. (1996) Eur. J. Biochem. 235, 120-127]. In that study, qualitative NMR data without computational analysis were employed to conclude that the extrusion at the lesion site occurs at the [AAF]dG-dC step for the AAF-intercalated conformer of the adduct duplex. The structure of the [AF]dG adduct opposite a -2 deletion site determined in our group provides molecular insights into the architecture of extended slipped mutagenic intermediates involving aromatic amine intercalation and base-displaced syn modified guanines in AF and, by analogy, AAF-induced mutagenesis in the NarI hot spot sequence context. C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV LIFE SCI,OAK RIDGE,TN 37831. NYU,DEPT BIOL,NEW YORK,NY 10003. RI Gorin, Andrey/B-1545-2014 FU NCI NIH HHS [CA-75449, CA-28038, CA-49982] NR 50 TC 27 Z9 27 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 25 PY 1997 VL 36 IS 47 BP 14479 EP 14490 DI 10.1021/bi972205z PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH566 UT WOS:A1997YH56600024 PM 9398167 ER PT J AU Mao, B Gu, ZT Gorin, A Hingerty, BE Broyde, S Patel, DJ AF Mao, B Gu, ZT Gorin, A Hingerty, BE Broyde, S Patel, DJ TI Solution structure of the aminofluorene-stacked conformer of the syn [AF]-C-8-dG adduct positioned at a template-primer junction SO BIOCHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; DNA DUPLEX; 2-AMINOFLUORENE-MODIFIED DNA; ENERGY MINIMIZATION; MOLECULAR-DYNAMICS; BASE DISPLACEMENT; DG OPPOSITE; MAJOR GROOVE; NMR; 2-ACETYLAMINOFLUORENE AB A solution structural study has been undertaken on the aminofluorene-C-8-dG ([AF]dG) adduct located at a single strand-double strand d(A1-A2-C3-[AF]G4-C5-T6-A7-C8-C9-A10-T11-C12-C13) . d(G14-G15-A16-T17-G18-G19-T20-A21-G22) 13/9-mer junction (designated [AF]dG 13/9-mer) using proton-proton distance and intensity restraints derived from NMR data in combination with a computational protocol, which includes intensity refinement. This single strand-double strand junction models one arm of a replication fork composed of a 13-mer template strand, which contains the [AF]dG modification site, and a 9-mer primer strand, which has been elongated up to, but not including, the modified guanine. The NMR data establish that the duplex segment retains a minimally perturbed B-DNA conformation including Watson-Crick hydrogen-bonding at the junctional dC5.dG22 base pair. The NMR spectra are consistent with the guanine ring of the [AF]dG4 adduct adopting a syn glycosidic torsion angle and being displaced into the major groove with the adjacent dC3 residue displaced into the minor groove. Such a base displacement of the modified guanine is accompanied by stacking of one face of the fluorene ring of [AF]dG4 with the dC5.dG22 base pair, while the other face of the flourene ring is stacked with the purine ring of the nonadjacent dA2 residue in the intensity-refined solution structures of the [AF]dG 13/9-mer. A comparison of structural features of the C-8-[AF]dG adduct (this study) with those of the (+)-trans-anti-N-2-[BP]dG adduct [Cosman et al. (1995) Biochemistry 34, 15334-15350] in the same 13/9-mer junctional sequence context has identified common features associated with the alignment of the modified guanine adducts at the template-primer junction. Thus, despite differences in the covalent linkage site for the C-8-[AF]dG and (+)-trans-anti-N-2-[BP]dG adducts, one face of the aromatic ring of the carcinogen stacks over the junctional base pair and in so doing displaces the modified guanine in a syn alignment into the major groove. These results lend credence to earlier proposals that such an adduct alignment may represent a common mutagenic conformer at a template-primer junction associated with a replication fork. C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV LIFE SCI,OAK RIDGE,TN 37831. NYU,DEPT BIOL,NEW YORK,NY 10003. RI Gorin, Andrey/B-1545-2014 FU NCI NIH HHS [CA-28038, CA-49982, CA75449] NR 34 TC 18 Z9 18 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 25 PY 1997 VL 36 IS 47 BP 14491 EP 14501 DI 10.1021/bi972206r PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH566 UT WOS:A1997YH56600025 PM 9398168 ER PT J AU Newton, MD AF Newton, MD TI Medium reorganization and electronic coupling in long-range electron transfer SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article; Proceedings Paper CT International Symposium on Electron Transfer in Protein and Supramolecular Assesmblies at Interfaces CY MAR 17-20, 1996 CL SHONAN VILLAGE CTR, HAYAMA, JAPAN SP Yokohama Natl Univ, Minist Educ Sci & Culture, Japan HO SHONAN VILLAGE CTR DE long-range electron transfer; reorganization energy; electronic coupling integral; bridge conformation ID TRANSITION-METAL COMPLEXES; SUPEREXCHANGE PATHWAY CALCULATION; BENZENE-DERIVATIVES; SPECTROSCOPY; ELEMENTS; REFINEMENT; ABINITIO; SPACERS; LIGAND; RATES AB Two quantities crucial in controlling long-range electron transfer (ET) kinetics are the medium (or solvent) reorganization energy E-r and the donor/acceptor (D/A) electronic coupling integral H-DA. Detailed theoretical models for E-r and H-DA are exploited in a variety of calculations, which include either continuum or molecular-level representations of solvent. The ability of different types of interactions (covalent, hydrogen-bonded and non-bonded) in mediating effective D/A coupling are evaluated, and new procedures for defining diabatic states, including a generalization of the Mulliken-Hush model, allow applications to optical and excited state as well as ground state ET in a many-state framework. (C) 1997 Elsevier Science S.A. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Newton, MD (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 30 TC 22 Z9 22 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD NOV 25 PY 1997 VL 438 IS 1-2 BP 3 EP 10 DI 10.1016/S0022-0728(96)05025-5 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA YR039 UT WOS:000071451300002 ER PT J AU Sibbald, MS Chumanov, G Cotton, TM AF Sibbald, MS Chumanov, G Cotton, TM TI Reductive properties of iodide-modified silver nanoparticles SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article; Proceedings Paper CT International Symposium on Electron Transfer in Protein and Supramolecular Assesmblies at Interfaces CY MAR 17-20, 1996 CL SHONAN VILLAGE CTR, HAYAMA, JAPAN SP Yokohama Natl Univ, Minist Educ Sci & Culture, Japan HO SHONAN VILLAGE CTR DE silver; cytochrome c; 2,6-dichloroindophenol; films; reduction; colloid; surface enhanced Raman ID ENHANCED RAMAN-SPECTROSCOPY; CYTOCHROME-C; MODIFIED GOLD; SURFACE; ELECTRODE; ADSORPTION; BINDING; INTERFACES; COLLOIDS; ANIONS AB Reduction of cytochrome c and 2,6-dichloroindophenol was observed on iodide-modified colloidal silver films. Two different processes were identified: reduction at sub-to monolayer coverages by I- on the Ag surface and reduction in the presence of free iodide in solution. In the former, only about 5% of the electron acceptor molecules relative to surface-bound I- underwent reduction, whereas in the latter a 1:1 stoichiometry was observed. Emission around 425 nm indicated the formation of molecular silver iodide. It was concluded that, in the absence of an electron acceptor, binding of iodide to the silver surface forms a complex which is different from molecular AgI. The electron derived from partial charge transfer between I- and the Ag metal resides near the silver-iodide complex and does not contribute to the 'free' electron density of the silver nanoparticles. (C) 1997 Elsevier Science S.A. C1 Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Cotton, TM (reprint author), Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. NR 31 TC 29 Z9 30 U1 1 U2 9 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD NOV 25 PY 1997 VL 438 IS 1-2 BP 179 EP 185 DI 10.1016/S0022-0728(97)00035-1 PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA YR039 UT WOS:000071451300028 ER PT J AU Feldman, WC Barraclough, BL Hansen, CJ Sprague, AL AF Feldman, WC Barraclough, BL Hansen, CJ Sprague, AL TI The neutron signature of Mercury's volatile polar deposits SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID HYDROGEN CONTENT; ICE; STABILITY; ANOMALIES; IMAGES; POLES AB Neutron leakage flux spectra are simulated to explore whether the nature of volatile deposits residing within the permanently shaded craters near the poles of Mercury can be identified using state-of-the-art space neutron detection techniques deployed aboard a flyby mission to Mercury. The most sensitive method for discriminating between H2O (ice)-rich and S-rich deposits involves measurement of the flux of epithermal neutrons. We conclude that a single flyby over crater Chao Meng-Fu at an altitude of 200 km is sufficient to detect a circular deposit rich in elemental sulfur at the 2.6 sigma statistical significance level, and that a similar deposit rich in H2O can be identified at the 7.8 sigma level. Whereas identification of a S-rich deposit is not unique but compelling because of auxiliary physical arguments, that of an H2O deposit is unique. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. RP Feldman, WC (reprint author), LOS ALAMOS NATL LAB,MS-D466,LOS ALAMOS,NM 87545, USA. NR 23 TC 19 Z9 19 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-PLANET JI J. Geophys. Res.-Planets PD NOV 25 PY 1997 VL 102 IS E11 BP 25565 EP 25574 DI 10.1029/97JE02353 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA YK014 UT WOS:A1997YK01400001 ER PT J AU Wilson, DM Thompson, LH AF Wilson, DM Thompson, LH TI Life without DNA repair SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Editorial Material DE DNA damage; base excision repair; knockout mutations; transgenic mice ID BASE-EXCISION-REPAIR; MOLECULAR NICK-SENSOR; POLYMERASE-BETA; ESCHERICHIA-COLI; LIGASE-III; POLY(ADP-RIBOSE) POLYMERASE; EXONUCLEASE-III; BOVINE TESTIS; HUMAN HOMOLOG; CDNA CLONING RP Wilson, DM (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551, USA. NR 61 TC 197 Z9 203 U1 2 U2 8 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 NOV 25 PY 1997 VL 94 IS 24 BP 12754 EP 12757 DI 10.1073/pnas.94.24.12754 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ456 UT WOS:A1997YJ45600011 PM 9398071 ER PT J AU Barenblatt, GI Chorin, AJ Kast, A AF Barenblatt, GI Chorin, AJ Kast, A TI The influence of the flow of the reacting gas on the conditions for a thermal explosion SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article AB The classical problem of thermal explosion is modified so that the chemically active gas is not at rest but is flowing in a long cylindrical pipe, Up to a certain section the heat-conducting walls of the pipe are held at ion: temperature so that the reaction rate is small and there is no heat release; at that section the ambient temperature is increased and an exothermic reaction begins, The question is whether a slow reaction regime will be established or a thermal explosion will occur, The mathematical formulation of the problem is presented, It is shown that when the pipe radius is larger than a critical value, the solution of the new problem exists only up to a certain distance along the axis, The critical radius is determined by conditions in a problem with a uniform axial temperature, The loss of existence is interpreted as a thermal explosion; the critical distance is the safe reactor's length, Both laminar and developed turbulent flow regimes are considered, In a computational experiment the loss of the existence appears as a divergence of a numerical procedure; numerical calculations reveal asymptotic scaling laws with simple powers for the critical distance. RP Barenblatt, GI (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT MATH,BERKELEY,CA 94720, USA. NR 3 TC 5 Z9 5 U1 0 U2 2 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 NOV 25 PY 1997 VL 94 IS 24 BP 12762 EP 12764 DI 10.1073/pnas.94.24.12762 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ456 UT WOS:A1997YJ45600014 PM 11038593 ER PT J AU Hang, B Singer, B Margison, GP Elder, RH AF Hang, B Singer, B Margison, GP Elder, RH TI Targeted deletion of alkylpurine-DNA-N-glycosylase in mice eliminates repair of 1,N-6-ethenoadenine and hypoxanthine but not of 3,N-4-ethenocytosine or 8-oxoguanine SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID CHLORIDE METABOLITE CHLOROACETALDEHYDE; SITE-SPECIFIC MUTAGENESIS; ESCHERICHIA-COLI; ULTRAVIOLET-B; 3-METHYLADENINE; GENE; PURIFICATION; LACKING; MOUSE; CELLS AB It has previously been reported that 1,N-6-ethenoadenine (epsilon A), deaminated adenine (hypoxanthine, Hx), and 7,8-dihydro-8-oxoguanine (8-oxoG), but not 3,N-4-ethenocytosine (epsilon C), are released from DNA in vitro by the DNA repair enzyme alkylpurine-DNA-N-glycosylase (APNG), To assess the potential contribution of APNG to the repair of each of these mutagenic lesions in vivo, we have used cell-free extracts of tissues from APNG-null mutant mice and wild-type controls, The ability of these extracts to cleave defined oligomers containing a single modified base was determined, The results showed that both testes and liver cells of these knockout mice completely lacked activity toward oligonucleotides containing epsilon A and Hx, but retained wild-type levels of activity for epsilon C and 8-oxoG, These findings indicate that (i) the previously identified epsilon A-DNA glycosylase and Hx-DNA glycosylase activities are functions of APNG; (ii) the two structurally closely related mutagenic adducts epsilon A and epsilon C are repaired by separate gene products; and (iii) APNG does not contribute detectably to the repair of 8-oxoG. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. CHRISTIE HOSP NHS TRUST,PATERSON INST CANC RES,CANC RES CAMPAIGN,SECT GENOME DAMAGE & REPAIR,MANCHESTER M20 4BX,LANCS,ENGLAND. FU NCI NIH HHS [CA 47723, CA 72079, R01 CA047723, R01 CA072079]; NIEHS NIH HHS [ES 07363] NR 36 TC 120 Z9 122 U1 0 U2 2 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 NOV 25 PY 1997 VL 94 IS 24 BP 12869 EP 12874 DI 10.1073/pnas.94.24.12869 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ456 UT WOS:A1997YJ45600034 PM 9371767 ER PT J AU Knowles, DW Tilley, L Mohandas, N Chasis, JA AF Knowles, DW Tilley, L Mohandas, N Chasis, JA TI Erythrocyte membrane vesiculation: Model for the molecular mechanism of protein sorting SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID RED BLOOD-CELLS; TRANSFERRIN RECEPTOR; GLYCOPHORIN-A; EXPRESSION; MATURATION; GOLGI; DIFFERENTIATION; IDENTIFICATION; RETICULOCYTES; COMPONENTS AB Budding and vesiculation of erythrocyte membranes occurs by a process involving an uncoupling of the membrane skeleton from the lipid bilayer, Vesicle formation provides an important means whereby protein sorting and trafficking can occur. To understand the mechanism of sorting at the molecular level, we have developed a micropipette technique to quantify the redistribution of fluorescently labeled erythrocyte membrane components during mechanically induced membrane deformation and vesiculation. Our previous studies indicated that the spectrin-based membrane skeleton deforms elastically, producing a constant density gradient during deformation. Our current studies showed that during vesiculation the skeleton did not fragment but rather retracted to the cell body, resulting in a vesicle completely depleted of skeleton, These local changes in skeletal density regulated the sorting of nonskeletal membrane components, Highly mobile membrane components, phosphatidylethanolamine- and glycosylphosphatidylinositol-linked CD59 with no specific skeletal association were enriched in the vesicle, In contrast, two components with known specific skeletal association, band 3 and glycophorin A, were differentially depleted in vesicles, Increasing the skeletal association of glycophorin A by liganding its extrafacial domain reduced the fraction partitioning to the vesicle. We conclude that this technique of bilayer/skeleton uncoupling provides a means with which to study protein sorting driven by changes in local skeletal density. Moreover, it is the interaction of particular membrane components with the spectrin-based skeleton that determines molecular partitioning during protein sorting. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. LA TROBE UNIV,BUNDOORA,VIC 3083,AUSTRALIA. FU NHLBI NIH HHS [HL31579, R01 HL031579]; NIDDK NIH HHS [P01 DK032094, DK26263, DK32094, R01 DK026263, R37 DK026263] NR 31 TC 56 Z9 56 U1 1 U2 3 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 NOV 25 PY 1997 VL 94 IS 24 BP 12969 EP 12974 DI 10.1073/pnas.94.24.12969 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ456 UT WOS:A1997YJ45600051 PM 9371784 ER PT J AU Shin, MK Russell, LB Tilghman, SM AF Shin, MK Russell, LB Tilghman, SM TI Molecular characterization of four induced alleles at the Ednrb locus SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID ENDOTHELIN-B-RECEPTOR; MOUSE AGOUTI LOCUS; TRANSLATIONAL REGULATION; HIRSCHSPRUNG DISEASE; MUTATIONS; DELETION; GENE; MICE; BINDING; PROTEIN AB The piebald locus on mouse chromosome 14 encodes the endothelin B receptor (EDNRB), a G protein-coupled, seven-transmembrane domain protein, which is required for neural crest-derived melanocyte and enteric neuron development, A spontaneous null allele of Ednrb results in homozygous mice that are predominantly white and die as juveniles from megacolon, To identify the important domains for EDNRB function, four recessive juvenile lethal alleles created by either radiation or chemical mutagens (Ednrb(27Pub), Ednrb(17Frs), Ednrb(1Chlc), and Ednrb(3Chlo)) were examined at the molecular level, Ednrb(27Pub) mice harbor a mutation at a critical proline residue in the fifth transmembrane domain of the EDNRB protein, A gross genomic alteration within the Ednrb gene in Ednrb(3Chlo) results in the production of aberrantly sized transcripts and no authentic Ednrb mRNA. Ednrb(17FrS) mice exhibited a decreased level of Ednrb mRNA, supporting previous observations that the degree of spotting in piebald mice is dependent on the amount of EDNRB expressed, Finally, no molecular defect was detected in Ednrb(1Chlc) mice, which produce normal levels of Ednrb mRNA in adult brain, suggesting that the mutation affects important regulatory elements that mediate the expression of the gene during development. C1 PRINCETON UNIV,HOWARD HUGHES MED INST,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT MOL BIOL,PRINCETON,NJ 08544. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. FU NIEHS NIH HHS [1-Y01-ES-50318-00] NR 43 TC 21 Z9 21 U1 0 U2 2 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 NOV 25 PY 1997 VL 94 IS 24 BP 13105 EP 13110 DI 10.1073/pnas.94.24.13105 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YJ456 UT WOS:A1997YJ45600074 PM 9371807 ER PT J AU Menon, PM Feigerle, CS Thundat, T Heatherly, L Clausing, RE AF Menon, PM Feigerle, CS Thundat, T Heatherly, L Clausing, RE TI Indexing the hopper shaped {111} face produced in chemical vapor deposited diamond SO APPLIED PHYSICS LETTERS LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; ATOMIC-FORCE MICROSCOPY; 100 FACES; GROWTH; SURFACE; FILMS; MORPHOLOGY; NUCLEATION; RECONSTRUCTION AB The hopper shaped {111} face frequently observed in cube octahedral crystallites of diamond has been analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The diamond was grown via hot filament assisted chemical vapor deposition with a feed gas composition of 1% methane in hydrogen. The SEM images of these crystallites show that the {100} faces are usually flatter than the {111}. The hopper shaped (111) faces have been imaged using the tapping mode of the AFM and the angles between planes and their orientations determined. The planes comprising the hoppered {111} face were found to belong to the {221} and {331} family. The implications of the presence of higher index planes as well as other growth features on the growth mechanisms involved are presented. (C) 1997 American Institute of Physics. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Menon, PM (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 22 TC 1 Z9 1 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 24 PY 1997 VL 71 IS 21 BP 3078 EP 3080 DI 10.1063/1.120282 PG 3 WC Physics, Applied SC Physics GA YG834 UT WOS:A1997YG83400016 ER PT J AU Han, J Ng, TB Biefeld, RM Crawford, MH Follstaedt, DM AF Han, J Ng, TB Biefeld, RM Crawford, MH Follstaedt, DM TI The effect of H-2 on morphology evolution during GaN metalorganic chemical vapor deposition SO APPLIED PHYSICS LETTERS LA English DT Article ID BUFFER LAYER; PLANE SAPPHIRE; GROWTH; ALN AB lit situ optical reflectance transients reveal that the morphology evolution of the initial low-temperature buffer layer strongly influences the structural and electrical quality of the high-temperature GaN films. Moreover, the morphology evolution of that buffer layer, specifically evolution of the spatial and orientational distributions of the nuclei, is strongly affected by H-2. The growth conditions for which surface smoothness is maintained throughout the two-step growth do not necessarily produce the best quality final GaN films; instead, there may be an optimal roughness and incubation period en route to the best quality final films. RP Han, J (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 150 Z9 151 U1 2 U2 24 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 24 PY 1997 VL 71 IS 21 BP 3114 EP 3116 DI 10.1063/1.120263 PG 3 WC Physics, Applied SC Physics GA YG834 UT WOS:A1997YG83400028 ER PT J AU Agarwal, A Gossmann, HJ Eaglesham, DJ Pelaz, L Jacobson, DC Haynes, TE Erokhin, YE AF Agarwal, A Gossmann, HJ Eaglesham, DJ Pelaz, L Jacobson, DC Haynes, TE Erokhin, YE TI Reduction of transient diffusion from 1-5 keV Si+ ion implantation due to surface annihilation of interstitials SO APPLIED PHYSICS LETTERS LA English DT Article ID ENHANCED DIFFUSION; SILICON; EPITAXY; DEFECT; BORON; FILMS AB The reduction of transient enhanced diffusion (TED) with reduced implantation energy has been investigated and quantified. A fixed dose of 1 x 10(14) cm(-2) Si+ was implanted at energies ranging from 0.5 to 20 keV into boron doping superlattices and enhanced diffusion of the buried boron marker layers was measured for anneals at 810, 950, and 1050 degrees C. A linearly decreasing dependence of diffusivity enhancement on decreasing Si+ ion range is observed at all temperatures, extrapolating to similar to 1 for 0 keV. This is consistent with our expectation that at zero implantation energy there would be no excess interstitials from the implantation and hence no TED. Monte Carlo modeling and continuum simulations are used to fit the experimental data. The results are consistent with a surface recombination length for interstitials of <10 nm. The data presented here demonstrate that in the range of annealing temperatures of interest for p-n junction formation, TED is reduced at smaller ion implantation energies and that this is due to increased interstitial annihilation at the surface. (C) 1997 American Institute of Physics. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. EATON CORP,BEVERLY,MA 01950. UNIV VALLADOLID,DEPT ELECT & ELECT,VALLADOLID,SPAIN. RP Agarwal, A (reprint author), LUCENT TECHNOL,BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. RI Pelaz, Lourdes/M-1766-2014; Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 16 TC 69 Z9 69 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 24 PY 1997 VL 71 IS 21 BP 3141 EP 3143 DI 10.1063/1.120552 PG 3 WC Physics, Applied SC Physics GA YG834 UT WOS:A1997YG83400037 ER PT J AU Xu, J Somieski, B Hulett, LD Pint, BA Tortorelli, PF Suzuki, R Ohdaira, T AF Xu, J Somieski, B Hulett, LD Pint, BA Tortorelli, PF Suzuki, R Ohdaira, T TI Microdefects in Al2O3 films and interfaces revealed by positron lifetime spectroscopy SO APPLIED PHYSICS LETTERS LA English DT Article AB We have studied microdefects and interfaces of Al2O3 films On iron and nickel aluminide substrates using variable-energy positron lifetime spectroscopy. Di-vacancies, vacancy clusters, and microvoids were observed in the oxide scales. Their sizes and distributions were determined by the nature of the process used to synthesize the alumina film, and influenced by the composition of the alloy substrates. For oxide-iron aluminide interfaces, positron lifetimes are longer than those for the alumina layer itself, suggesting a greater defect concentration at such sites. (C) 1997 American Institute of Physics. C1 ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN. RP Xu, J (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Pint, Bruce/A-8435-2008 OI Pint, Bruce/0000-0002-9165-3335 NR 15 TC 7 Z9 7 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 NOV 24 PY 1997 VL 71 IS 21 BP 3165 EP 3167 DI 10.1063/1.120278 PG 3 WC Physics, Applied SC Physics GA YG834 UT WOS:A1997YG83400045 ER PT J AU Kitching, P Nakano, T Rozon, M Soluk, R Adler, S Atiya, MS Chiang, IH Frank, JS Haggerty, JS Kycia, TF Li, KK Littenberg, LS Sambamurti, A Stevens, A Strand, RC Witzig, C Louis, WC Akerib, DS Ardebili, M Convery, M Ito, MM Marlow, DR McPherson, RA Meyers, PD Selen, MA Shoemaker, FC Smith, FC Blackmore, EW Bryman, DA Felawka, L Konaka, A Kuno, Y Macdonald, JA Numao, T Padley, P Poutissou, JM Poutissou, R Roy, J Turcot, AS AF Kitching, P Nakano, T Rozon, M Soluk, R Adler, S Atiya, MS Chiang, IH Frank, JS Haggerty, JS Kycia, TF Li, KK Littenberg, LS Sambamurti, A Stevens, A Strand, RC Witzig, C Louis, WC Akerib, DS Ardebili, M Convery, M Ito, MM Marlow, DR McPherson, RA Meyers, PD Selen, MA Shoemaker, FC Smith, FC Blackmore, EW Bryman, DA Felawka, L Konaka, A Kuno, Y Macdonald, JA Numao, T Padley, P Poutissou, JM Poutissou, R Roy, J Turcot, AS TI Observation of the decay K+->pi(+)gamma gamma SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIATIVE KAON DECAYS; CHIRAL PERTURBATION-THEORY; SEARCH AB The first observation of the decay K+ --> pi(+)gamma gamma is reported. A total of 31 events was observed with an estimated background of 5.1 +/- 3.3 events in the pi(+) momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K+ --> pi(+)gamma gamma, 100 MeV/c < Ppi+ < 180 MeV/c), is [6.0 +/- 1.5(stat) +/- 0.7(syst)] X 10(-7). No K+ --> pi(+)gamma gamma decay was observed in the pi(+) momentum region greater than 215 MeV/c. The observed pi(+) momentum spectrum is compared with the predictions of chiral perturbation theory. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. LOS ALAMOS NATL LAB,MEDIUM ENERGY PHYS DIV,LOS ALAMOS,NM 87545. PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544. TRIUMF,VANCOUVER,BC V6T 2A3,CANADA. RP Kitching, P (reprint author), UNIV ALBERTA,CTR SUBATOM RES,EDMONTON,AB T6G 2N5,CANADA. RI Marlow, Daniel/C-9132-2014; OI Littenberg, Laurence/0000-0001-8373-7179 NR 14 TC 46 Z9 46 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4079 EP 4082 DI 10.1103/PhysRevLett.79.4079 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800009 ER PT J AU Adams, J AlaviHarati, A Albuquerque, IF Alexopoulos, T Arenton, M Arisaka, K Averitte, S Barker, AR Bellantoni, L Bellavance, A Belz, J BenDavid, R Blucher, E Bock, GJ Bown, C Bricker, JD Bright, S Cheu, E Childress, S Coleman, R Corcoran, MD Corti, G Cox, B Crisler, MB Erwin, AR Ford, R Graham, G Graham, J Hagan, K Halkiadakis, E Hanagaki, K Hidaka, S Jejer, V Jennings, J Jensen, DA Johnson, P Kessler, R Kobrak, HGE LaDue, J Lath, A Ledovskoy, A McManus, AP Mikelsons, P Monnier, E Nakaya, T Nauenberg, U Nelson, KS Nguyen, H ODell, V Pang, M Pordes, R Prasad, V Qiao, C Quinn, B Ramberg, E Ray, RE Ronzhin, A Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, P Slater, W Solomey, N Somalwar, SV Stone, RL Swallow, EC Swanson, RA Tesarek, RJ Thomson, GB Tschirhart, R Wah, YW White, HB Whitmore, J Winstein, B Winston, R Wu, JY Yamanaka, T Zimmerman, ED AF Adams, J AlaviHarati, A Albuquerque, IF Alexopoulos, T Arenton, M Arisaka, K Averitte, S Barker, AR Bellantoni, L Bellavance, A Belz, J BenDavid, R Blucher, E Bock, GJ Bown, C Bricker, JD Bright, S Cheu, E Childress, S Coleman, R Corcoran, MD Corti, G Cox, B Crisler, MB Erwin, AR Ford, R Graham, G Graham, J Hagan, K Halkiadakis, E Hanagaki, K Hidaka, S Jejer, V Jennings, J Jensen, DA Johnson, P Kessler, R Kobrak, HGE LaDue, J Lath, A Ledovskoy, A McManus, AP Mikelsons, P Monnier, E Nakaya, T Nauenberg, U Nelson, KS Nguyen, H ODell, V Pang, M Pordes, R Prasad, V Qiao, C Quinn, B Ramberg, E Ray, RE Ronzhin, A Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, P Slater, W Solomey, N Somalwar, SV Stone, RL Swallow, EC Swanson, RA Tesarek, RJ Thomson, GB Tschirhart, R Wah, YW White, HB Whitmore, J Winstein, B Winston, R Wu, JY Yamanaka, T Zimmerman, ED TI Search for light gluinos via the spontaneous appearance of pi(+)pi(-) pairs with an 800 GeV/c proton beam at Fermilab SO PHYSICAL REVIEW LETTERS LA English DT Article ID MESON PRODUCTION; PARTICLES AB We searched for the appearance of pi(+)pi(-) pairs with invariant mass greater than or equal to 648 MeV/c(2) in a neutral beam. Such an observation could signify the decay of a long-lived light neutral particle. We find no evidence for this decay. Our null result severely constrains the existence of an R-0 hadron, which is the lightest bound state of a gluon and a light gluino (g (g) over tilde), and thereby also the existence of a light gluino. Depending on the photino mass, we exclude the R-0 in the mass and lifetime ranges of 1.2-4.6 GeV/c(2) and 2 X 10(-10)-7 X 10(-4) s, respectively. C1 RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. UNIV ARIZONA,TUCSON,AZ 85721. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90095. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. 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. OSAKA UNIV,TOYONAKA,OSAKA 560,JAPAN. RICE UNIV,HOUSTON,TX 77005. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. UNIV WISCONSIN,MADISON,WI 53706. RI Albuquerque, Ivone/H-4645-2012 OI Albuquerque, Ivone/0000-0001-7328-0136 NR 17 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4083 EP 4087 DI 10.1103/PhysRevLett.79.4083 PG 5 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800010 ER PT J AU Hackman, G Khoo, TL Carpenter, MP Lauritsen, T LopezMartens, A Calderin, IJ Janssens, RVF Ackermann, D Ahmad, I Agarwala, S Blumenthal, DJ Fischer, SM Nisius, D Reiter, P Young, J Amro, H Moore, EF Hannachi, F Korichi, A Lee, IY Macchiavelli, AO Dossing, T Nakatsukasa, T AF Hackman, G Khoo, TL Carpenter, MP Lauritsen, T LopezMartens, A Calderin, IJ Janssens, RVF Ackermann, D Ahmad, I Agarwala, S Blumenthal, DJ Fischer, SM Nisius, D Reiter, P Young, J Amro, H Moore, EF Hannachi, F Korichi, A Lee, IY Macchiavelli, AO Dossing, T Nakatsukasa, T TI Spins, parity, excitation energies, and octupole structure of an excited superdeformed band in Hg-194 and implications for identical bands SO PHYSICAL REVIEW LETTERS LA English DT Article ID HG NUCLEI; QUANTIZED ALIGNMENT; STATES AB An excited superdeformed band in Hg-194, observed to decay directly to both normal-deformed and superdeformed yrast states, is proposed to be a K-pi = 2(-) octupole vibrational band, based on its excitation energies, spins, and likely parity. The transition energies are identical to those of the yrast superdeformed band in Hg-192, but originate from levels with different spins and parities. The evolution of transition energies with spin suggests that cancellations between pairing and particle alignment are partly responsible for the identical transition energies. C1 CTR SPECTROMETRIE NUCL & SPECTROMETRIE MASSE,CNRS,IN2P3,F-91405 ORSAY,FRANCE. N CAROLINA STATE UNIV,RALEIGH,NC 27695. TUNL,DURHAM,NC 27708. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. UMIST,MANCHESTER M60 1QD,LANCS,ENGLAND. RP Hackman, G (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Carpenter, Michael/E-4287-2015; Nakatsukasa, Takashi/O-9995-2014 OI Carpenter, Michael/0000-0002-3237-5734; NR 35 TC 94 Z9 95 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4100 EP 4103 DI 10.1103/PhysRevLett.79.4100 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800014 ER PT J AU Aranson, IS Bishop, AR AF Aranson, IS Bishop, AR TI Instability and stretching of vortex lines in the three-dimensional complex Ginzburg-Landau equation SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPIRAL WAVES; OSCILLATORY MEDIA; EXCITABLE MEDIA; DYNAMICS; STATES; RINGS AB The dynamics of curved vortex filaments is studied analytically and numerically in the framework of a three-dimensional complex Ginzburg-Landau equation (CGLE). It is proved that a straight vortex line is unstable with respect to spontaneous stretching and bending in a certain range of parameters of the CGLE, resulting in formation of persistent entangled vortex configurations. The analysis shows that the standard approach relating the velocity of the filament with the local curvature is insufficient to describe the instability and stretching of vortex lines. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP Aranson, IS (reprint author), BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. RI Aranson, Igor/I-4060-2013 NR 23 TC 19 Z9 19 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4174 EP 4177 DI 10.1103/PhysRevLett.79.4174 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800033 ER PT J AU Hannon, JB Bartelt, NC Swartzentruber, BS Hamilton, JC Kellogg, GL AF Hannon, JB Bartelt, NC Swartzentruber, BS Hamilton, JC Kellogg, GL TI Step faceting at the (001) surface of boron doped silicon SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY-ELECTRON MICROSCOPY; SI(001); SHAPES; PHASE AB We have used low energy electron microscopy to study the energetics of steps on the (001) surface of heavily boron doped Si. When the surface is cooled below 980 degrees C, the S-B step restructures dramatically, assuming a sawtooth profile consisting of triangular facets. The apex angle of the facets is strongly temperature dependent. By quantitative analysis of thermal step fluctuations and 2D island shapes we show that the free energy of isolated S-A steps decreases sharply as the temperature is lowered. Using the Wulff construction, we demonstrate that the observed faceting is a direct consequence of the vanishing S-A step free energy. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP Hannon, JB (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 42 Z9 42 U1 1 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 NOV 24 PY 1997 VL 79 IS 21 BP 4226 EP 4229 DI 10.1103/PhysRevLett.79.4226 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800046 ER PT J AU Lopez, D KrusinElbaum, L Safar, H Vinokur, VM Marwick, AD Sun, JZ Feild, C AF Lopez, D KrusinElbaum, L Safar, H Vinokur, VM Marwick, AD Sun, JZ Feild, C TI Forced entanglement vs anisotropic dissipation in a vortex line liquid SO PHYSICAL REVIEW LETTERS LA English DT Article ID COLUMNAR DEFECTS; II SUPERCONDUCTORS; SINGLE-CRYSTALS; LATTICE; YBA2CU3O7-DELTA; VORTICES; TRANSITION; MODEL AB We present evidence for forced topological entanglement of line-like vortices in the liquid regime of YBa2Cu3O7-delta With columnar defects. By splaying the defects within a fixed plane (in-fan) we create a (c) over cap-axis phase coherent vortex (string) structure which correlates with anisotropic dissipation. The high-field vortex motion is ''easy'' in fan and ''hard'' across fan in crystals - a signature of forced entanglement by a small angle splay. The high-field anisotropy is surprisingly reversed in thin films, where forced entanglement is absent. C1 UNIV ILLINOIS, DEPT PHYS, CHICAGO, IL 60607 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP IBM RES CORP, YORKTOWN HTS, NY 10598 USA. RI Sun, Jonathan/C-2773-2009 NR 24 TC 22 Z9 23 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4258 EP 4261 DI 10.1103/PhysRevLett.79.4258 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800054 ER PT J AU Toney, MF Davenport, AJ Oblonsky, LJ Ryan, MP Vitus, CM AF Toney, MF Davenport, AJ Oblonsky, LJ Ryan, MP Vitus, CM TI Atomic structure of the passive oxide film formed on iron SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCATTERING; DEFECTS AB We have used x-ray scattering to measure the structure of the passive oxide film formed at high anodic potentials on Fe(110) and Fe(001). The crystalline film has a small crystallite size (approximate to 50 Angstrom) and is oriented with the substrate. The film structure is based on Fe3O4, but with cation vacancies on octahedral and tetrahedral sites (80% and 66% occupancies, respectively) and with cations occupying octahedral interstitial sites (12% occupancy). These results resolve the long-standing controversy surrounding the film structure and provide a basis for understanding and modeling film properties important for corrosion resistance. C1 BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. RP IBM CORP, ALMADEN RES CTR, DIV RES, 650 HARRY RD, SAN JOSE, CA 95120 USA. RI Davenport, Alison/J-6089-2013 OI Davenport, Alison/0000-0003-0853-515X NR 21 TC 130 Z9 130 U1 3 U2 26 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4282 EP 4285 DI 10.1103/PhysRevLett.79.4282 PG 4 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800060 ER PT J AU Back, BB Hofman, DJ Nanal, V AF Back, BB Hofman, DJ Nanal, V TI Scaling laws, shell effects, and transient times in fission probabilities - Comment SO PHYSICAL REVIEW LETTERS LA English DT Article RP Back, BB (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4294 EP 4294 DI 10.1103/PhysRevLett.79.4294 PG 1 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800063 ER PT J AU Moretto, LG Jing, KX Gatti, R Rubehn, T Wozniak, GJ Schmitt, RP AF Moretto, LG Jing, KX Gatti, R Rubehn, T Wozniak, GJ Schmitt, RP TI Scaling laws, shell effects, and transient times in fission probabilities - Reply SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON C1 TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP Moretto, LG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 24 PY 1997 VL 79 IS 21 BP 4295 EP 4295 DI 10.1103/PhysRevLett.79.4295 PG 1 WC Physics, Multidisciplinary SC Physics GA YH018 UT WOS:A1997YH01800064 ER PT J AU Friedman, P Ferris, KF AF Friedman, P Ferris, KF TI A theoretical study of the aromaticity of hypervalent sulfur heterocycles SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article DE aromaticity; sulfur; heterocycles; electronic structure ID MOLECULAR-ORBITAL METHODS; VALENCE BASIS-SETS; ELECTRONIC-STRUCTURE; 2ND-ROW ELEMENTS AB In this paper we report on the heteroaromaticity of 1,2,5-thiadiazole-1,l-dioxide (I) and its isomers 1,2,4-thiadiazole-1,1-dioxide (II), 1,3,4-thiadiazole-1,I-dioxide (III) and 1,2,3-thiadiazoIe-1,1-dioxide (IV) by calculating their electronic structures and estimating their aromatic character in terms of our previously developed criteria: N, MDQ, Delta E-pi L(NLMO) and Delta E-pi L(Boys) as well as comparing their total energies. (I) is shown to be the most aromatic isomer in good agreement with chemical reasoning and experimental evidence. The 1,l-dioxides of thiazole and isothiazole were predicted to be intermediate in aromaticity between thiophene-l, 1-dioxide and the isomers, (I)-(N). N value measures indicate that thiophene-l,1-dioxide would retain a small measure of aromatic character relative to thiophene (N(thiophene) = 0.868, N(thiophene-l,l-dioxide) = 0.389). (C) 1997 Elsevier Science B.V. C1 Pacific NW Lab, Energy & Environm Sci Div, Richland, WA 99352 USA. Pratt Inst, Dept Math & Sci, Brooklyn, NY 11205 USA. RP Ferris, KF (reprint author), Pacific NW Lab, Energy & Environm Sci Div, POB 999, Richland, WA 99352 USA. NR 24 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD NOV 24 PY 1997 VL 418 IS 2-3 BP 119 EP 126 DI 10.1016/S0166-1280(96)05017-8 PG 8 WC Chemistry, Physical SC Chemistry GA YT292 UT WOS:000071586100003 ER PT J AU Wu, HB Wang, LS AF Wu, HB Wang, LS TI Electronic structure of titanium oxide clusters: TiOy (y=1-3) and (TiO2)(n) (n=1-4) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; NANOPHASE TIO2; TRANSITION; OXYGEN; SPECTRA; MOLECULES; ENERGIES; STATES; FECN AB The electronic structure of two series of small titanium oxide clusters, TiOy (y = 1-3) and (TiO2)(n) (n = 1-4), is studied using anion photoelectron spectroscopy. Vibrationally resolved spectra are obtained for TiO- and TiO2-. Six low-lying electronic states for TiO are observed with five of these excited states resulting from multielectron transitions in the photodetachment processes. TiO2 is found to be closed-shell with a 2 eV highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO-LUMO) gap. The two lowest triplet and singlet excited states of TiO2 are observed with excitation energies at 1.96 and 2.4 eV, respectively. TiO3 is found to have a very high electron affinity (EA) of 4.2 eV, compared to 1.30 and 1.59 eV for TiO and TiO2, respectively. The larger (TiO2)(n) clusters are all closed-shell with HOMO-LUMO gaps similar to that of TiO2 and with increasing EAs: 2.1 eV for n = 2, 2.9 eV for n = 3, 3.3 eV for n = 4. The small HOMO-LUMO gaps for the clusters compared to that of bulk TiO2 are discussed in terms of the structure and bonding of these clusters. (C) 1997 American Institute of Physics. [S0021-9606(97)02444-6]. C1 PACIFIC NW LAB, ENVIRONM MOL SCI LAB, MS K8 88, RICHLAND, WA 99352 USA. RP Wu, HB (reprint author), WASHINGTON STATE UNIV, DEPT PHYS, RICHLAND, WA 99352 USA. NR 46 TC 118 Z9 121 U1 3 U2 26 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 22 PY 1997 VL 107 IS 20 BP 8221 EP 8228 DI 10.1063/1.475026 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG958 UT WOS:A1997YG95800001 ER PT J AU Simpson, WC Sieger, MT Orlando, TM Parenteau, L Nagesha, K Sanche, L AF Simpson, WC Sieger, MT Orlando, TM Parenteau, L Nagesha, K Sanche, L TI Dissociative electron attachment in nanoscale ice films: Temperature and morphology effects SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CORE-EXCITED RESONANCES; AMORPHOUS WATER ICE; VAPOR-DEPOSITED ICE; STIMULATED DESORPTION; GLASS-TRANSITION; PHOTOELECTRON-SPECTROSCOPY; MOLECULAR-SOLIDS; REFRACTIVE-INDEX; HEAT-CAPACITY; CUBIC ICE AB The electron-stimulated desorption (ESD) of D- ions from condensed D2O films is investigated. Three low-energy peaks are observed which are identified as arising from excitation of B-2(1), (2)A(1), and B-2(2) dissociative electron attachment (DEA) resonances. A fourth, higher energy feature is also seen in the D- yield which is likely due to the formation of a transient anion state that dissociates and/or decays into a dissociative excited state. The energies and ion yields of the resonances vary with the temperature and morphology of the D2O film. Below 60 K, the work function of the ice films changes with temperature and the DEA resonances shift in energy. The D- ESD yield generally increases with temperature, but it deviates from this trend at temperatures corresponding to structural phase transitions in ice. The (B-2(1)) D- temperature dependence is remarkably similar to that observed for the ESD of low-energy D+ ions from D2O ice, even though the two originate from different electronic excitations. These results are attributed to thermally induced changes in the hydrogen bonding network, which changes the lifetimes of the predissociative states that lead to ESD and which also allows for the reorientation of surface molecules. (C) 1997 American Institute of Physics. [S0021-9606(97)02344-1]. C1 PACIFIC NW LAB, WR WILEY ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. UNIV SHERBROOKE, FAC MED, CANADIAN MED RES GRP RADIAT SCI, SHERBROOKE, PQ J1H 5N4, CANADA. RI Sieger, Matthew/B-4261-2011 OI Sieger, Matthew/0000-0001-7387-3660 NR 72 TC 64 Z9 64 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 22 PY 1997 VL 107 IS 20 BP 8668 EP 8677 DI 10.1063/1.475019 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG958 UT WOS:A1997YG95800048 ER PT J AU Kaiser, RI Sun, W Suits, AG Lee, YT AF Kaiser, RI Sun, W Suits, AG Lee, YT TI Crossed beam reaction of atomic carbon, C(P-3(j)), with the propargyl radical, C3H3((XB2)-B-2): Observation of diacetylene, C4H2(X-1 Sigma(g)(+)) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HYDROCARBON MOLECULES; CHEMICAL-DYNAMICS; PHOTOCHEMISTRY; MODELS AB The reaction of ground-state carbon, C(P-3(j)), with the propargyl radical, C3H3((XB2)-B-2), is investigated at an average collision energy of 42.0 kJmol(-1) employing the crossed molecular beams technique and a universal mass spectrometric detector. The laboratory angular distribution and time-of-flight spectra of the C4H2 product are recorded at m/e = 50. Forward-convolution fitting of our data reveals the formation of diacetylene, HCCCCH, in its X-1 Sigma(g)(+) electronic ground state. The reaction dynamics are governed by an initial attack of C(P-3(j)) to the pi-electron density at the acetylenic carbon atom of the propargyl radical, followed by a [1,2]-hydrogen migration to the n-C4H3 isomer. A final carbon-hydrogen bond rupture yields atomic hydrogen and diacetylene through a tight exit transition state located 30-60 kJmol(-1) above the products. This first successful crossed molecular beams study of a reaction between an atom and a free radical marks the beginning of the next generation of crossed beams experiments elucidating the formation of molecular species in combustion processes, chemical vapor deposition, in the interstellar medium, outflows of carbon stars, and hydrocarbon-rich planetary atmospheres via radical-radical reactions. (C) 1997 American Institute of Physics. [S0021-9606(97)04144-5]. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Lee, Yuan-Tseh/F-7914-2012 NR 27 TC 39 Z9 39 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 22 PY 1997 VL 107 IS 20 BP 8713 EP 8716 DI 10.1063/1.475025 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG958 UT WOS:A1997YG95800054 ER PT J AU Bakhtiar, R Chen, H Ogo, S Fish, RH AF Bakhtiar, R Chen, H Ogo, S Fish, RH TI Gas phase molecular recognition of aromatic amino acid and aromatic carboxylic acid guests with a supramolecular [(eta(5)-pentamethylcyclopentadienyl)rhodium(2'-deoxyadenosine)](3)(3+) cyclic trimer host via non-covalent pi-pi interactions utilizing electrospray ionization mass spectroscopy SO CHEMICAL COMMUNICATIONS LA English DT Article ID SPECTROMETRY; CHEMISTRY; COMPLEXES AB A novel, gas phase, host-guest molecular recognition process, detected by electrospray ionization mass spectrometry, using guests that encompass aromatic amino acids and aromatic and aliphatic carboxylic acids with a supramolecular, bioorganometallic host, [Cp*Rh(2'-deoxyadenosine)](3)[OTf](3) (Cp* = eta(5)-C5Me5), is found to occur predominately via non-covalent pi-pi interactions; non-covalent hydrophobic forces apparently being weak or non-existent. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STEVENS INST TECHNOL,DEPT CHEM,HOBOKEN,NJ 07030. NR 12 TC 26 Z9 26 U1 1 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 1359-7345 J9 CHEM COMMUN JI Chem. Commun. PD NOV 21 PY 1997 IS 22 BP 2135 EP 2136 DI 10.1039/a703100i PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA YG758 UT WOS:A1997YG75800002 ER PT J AU Thuery, P Nierlich, M Bryan, JC Lamare, V Dozol, JF Asfari, Z Vicens, J AF Thuery, P Nierlich, M Bryan, JC Lamare, V Dozol, JF Asfari, Z Vicens, J TI Crown ether conformations in 1,3-calix[4]arene bis(crown ethers): crystal structures of a caesium complex and solvent adducts and molecular dynamics simulations SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID SUPPORTED LIQUID MEMBRANES; 1,3-ALTERNATE CONFORMATION; ALKALI CATIONS; ACETONITRILE; 18-CROWN-6; CALIX<4>ARENES; GUESTS; CALIX<4>-BIS-CROWNS; SOLVATION; HYDRATION AB The crystal structures of solvent adducts of 1,3-calix[4]arene bis(18-crown-6) I and 1,3-calix[4]arene bis(naphtho-18-crown-6) 3 as well as the structure of the caesium complex of 3 have been determined. In 1.3CH(3)NO(2) and 3.3CH(3)CN the complexed solvent molecules have their methyl group at the centre of the crown ether rings, whereas in 3.C6H5CH3, the solvent is located in the crystal voids. The consequences on the crown ether conformations are noticeable: comparison with previous results shows that the conformation of I-is only slightly different in its acetonitrile and nitromethane adducts, the conformation with acetonitrile being the same as in the caesium and potassium complexes; the conformation of the acetonitrile adduct of 3 is the same as that in the caesium complex and is strongly different from the one obtained by crystallization in toluene. Molecular dynamics simulations in vacua were performed on free 3 and on its mononuclear caesium complex, and discussed in terms of the conformational mobility of the crown ether loop. C1 OAK RIDGE NATL LAB, CHEM SEPARAT GRP, OAK RIDGE, TN 37831 USA. CEA, SEP, LPTE, F-13108 ST PAUL LES DURANCE, FRANCE. ECPM, LAB CHIM INTERACT MOL SPECIF, CNRS URA 405, F-67008 STRASBOURG, FRANCE. RP Thuery, P (reprint author), CEA SACLAY, SCM, CNRS URA 331, BAT 125, F-91191 GIF SUR YVETTE, FRANCE. RI Thuery, Pierre/A-7429-2009 NR 53 TC 67 Z9 67 U1 0 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1472-7773 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD NOV 21 PY 1997 IS 22 BP 4191 EP 4202 PG 12 WC Chemistry, Inorganic & Nuclear SC Chemistry GA YJ429 UT WOS:A1997YJ42900010 ER PT J AU Moen, A Nicholson, DG Ronning, M Lamble, GM Lee, JF Emerich, H AF Moen, A Nicholson, DG Ronning, M Lamble, GM Lee, JF Emerich, H TI X-Ray absorption spectroscopic study at the cobalt K-edge on the calcination and reduction of the microporous cobalt silicoaluminophosphate catalyst CoSAPO-34 SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID ALUMINOPHOSPHATE MOLECULAR-SIEVES; CRYSTALLINE INORGANIC SOLIDS; REDOX CENTERS; CHEMISTRY; COAPO-5; STATE; ION AB The local environments about the cobalt atoms in as-synthesised, calcined and hydrogen-reduced CoSAPO-34 have been studied by X-ray absorption spectroscopy. Calcination of the as-synthesised material and reduction in hydrogen of the product of calcination were carried out at 450 degrees C and for 6 h, respectively. The results show that cobalt is sited as Co-II in the framework and that calcining CoSAPO-34 with 4.4% Co leads to two-thirds of the Co-II content being oxidised to Co-III thereby lending support to the view that the material is a redox catalyst. Reducing the calcined material with hydrogen leads to a material containing only Co-II. Taken together, the pre-edge, XANES and EXAFS regions indicate that one-third of the original tetrahedrally coordinated divalent cobalt in the as-synthesised product is maintained in the calcined and reduced products with the remaining cobalt being in the form of trivalent hexacoordinated and divalent hexacoordinated cobalt, respectively. C1 NORWEGIAN UNIV SCI & TECHNOL, DEPT CHEM, N-7055 TRONDHEIM, NORWAY. NORWEGIAN UNIV SCI & TECHNOL, DEPT IND CHEM, N-7055 TRONDHEIM, NORWAY. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. EUROPEAN SYNCHROTRON RADIAT FACIL, SWISS NORWEGIAN BEAMLINE, F-38043 GRENOBLE, FRANCE. RI Nicholson, David/I-3749-2013 NR 43 TC 39 Z9 39 U1 2 U2 14 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD NOV 21 PY 1997 VL 93 IS 22 BP 4071 EP 4077 DI 10.1039/a704488g PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG245 UT WOS:A1997YG24500024 ER PT J AU Smith, DJ Forrest, S Hightower, RR Perelson, AS AF Smith, DJ Forrest, S Hightower, RR Perelson, AS TI Deriving shape space parameters from immunological data SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID ORIGINAL ANTIGENIC SIN; ANTIBODY REPERTOIRE; IMMUNE-SYSTEM; CLONAL SELECTION; SIZE; DISCRIMINATION; INFLUENZA; NETWORK; REGION; MODEL AB We present a method for deriving shape space parameters that are consistent with immunological data, and illustrate the method by deriving shape space parameters for a model of cross-reactive memory. Cross-reactive memory responses occur when the immune system is primed by one strain of a pathogen and challenged with a related, but different, strain. Much of the nature of a cross-reactive response is determined by the quantity and distribution of the memory cells, raised to the primary antigen, that cross-react with the secondary antigen. B cells with above threshold affinity for an antigen lie in a region of shape space that we call a ball of stimlulation. In a cross-reactive response, the intersection of the balls of stimulation of the primary and secondary antigens contains the cross-reactive B cells and thus determines the degree of cross-reactivity between the antigens. We derive formulas for the volume of intersection of balls of stimulation in different shape spaces and show that the parameters of shape space, such as its dimensionality, have a large impact on the number of B cells in the intersection. The application of our method for deriving shape space parameters indicates that, for Hamming shape spaces, 20 to 25 dimensions, a three or four letter alphabet, and balls of stimulation of radius five or six, are choices that match the experimental data. For Euclidean shape spaces, five to eight dimensions and balls of stimulation with radius about 20% of the radius of the whole space, match the experimental data. C1 UNIV NEW MEXICO,DEPT COMP SCI,ALBUQUERQUE,NM 87131. RP Smith, DJ (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 34 TC 36 Z9 43 U1 0 U2 4 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD NOV 21 PY 1997 VL 189 IS 2 BP 141 EP 150 DI 10.1006/jtbi.1997.0495 PG 10 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA YL184 UT WOS:A1997YL18400003 PM 9405131 ER PT J AU Hui, L Gnedin, NY AF Hui, L Gnedin, NY TI Equation of state of the photoionized intergalactic medium SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE equation of state; intergalactic medium; quasars, absorption lines; cosmology, theory ID LYMAN-ALPHA FOREST; GRAVITATIONAL-INSTABILITY; COSMOLOGICAL CONSTANT; SCALE STRUCTURE; DARK MATTER; EVOLUTION; CLOUDS; MODEL; ABSORPTION; REDSHIFT AB We develop an efficient method of studying the effects of reionization history on the temperature-density relation of the intergalactic medium in the low-density limit (overdensity delta less than or similar to 5). It is applied to the study of photo-reionization models in which the amplitude, spectrum and onset epoch of the ionizing flux, as well as the cosmology: are systematically varied. We find that the mean temperature-density relation at z = 2-4 is well approximated by a power-law equation of state for uniform reionization models. We derive analytical expressions for its evolution and exhibit its asymptotic behaviour: it is found that for sufficiently early reionization, imprints of reionization history prior to z similar to 10 on the temperature-density relation are washed out. In this limit the temperature at the cosmic mean density is proportional to [Omega(b)h/root Omega(0)](1/1.7). While the amplitude of the radiation flux at the ionizing frequency of H I is found to have a negligible effect on the temperature-density relation as long as the universe reionizes before z similar to 5, the spectrum can change the overall temperature by about 20 per cent, through variations in the abundances of helium species. However, the slope of the mean equation of state is found to lie within a narrow range for all reionization models we study, where reionization takes place before z similar to 5, We discuss the implications of these findings for the observational properties of the Ly alpha forest. In particular, uncertainties in the temperature of the intergalactic medium, arising from the uncertain reionization history of our Universe, introduce a 30 per cent scaling in the amplitude of the column density distribution while the slope of the distribution is only affected by about 7 per cent. Finally, we discuss how a fluctuating ionizing field affects the above results. We argue that under certain conditions, the loss of memory of reionization history implies that at late times, the temperature-density relation of a gas in a fluctuating ionizing background can be approximated by one that results from a uniform radiation field, provided the universe reionizes sufficiently early. C1 UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP Hui, L (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,POB 500,BATAVIA,IL 60510, USA. NR 49 TC 395 Z9 395 U1 1 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0NE SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD NOV 21 PY 1997 VL 292 IS 1 BP 27 EP 42 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YK356 UT WOS:A1997YK35600013 ER PT J AU Souw, EK Meilunas, RJ AF Souw, EK Meilunas, RJ TI Response of CVD diamond detectors to alpha radiation SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE alpha radiation; detector; CVD diamond; polarization; carrier traps; band-gap model ID VAPOR-DEPOSITED DIAMOND; THIN-FILMS; SINGLE-CRYSTAL; DEFECTS; VACANCY; STATES AB This article describes some results from an experiment with CVD diamond films used as alpha particle detectors. It demonstrates that bulk polarization can be effectively stopped within a reasonable rime interval, This will enable detector calibration and quantitative measurement. A possible mechanism for the observed polarization quenching is discussed. It involves two types of carrier traps and a tentative band-gap model derived from the results of photoconductive current measurements. The experiment was set up mainly to investigate alpha detection properties of polycrystalline diamond films grown by the technique of microwave plasma enhanced chemical vapor deposition. For comparison, two commercially purchased diamond wafers were also investigated, i.e., one grown by the DC are jet method, and the other, a type-IIa natural diamond wafer (not preselected). The best response to cc particles was obtained using diamond thin-films grown by the microwave PECVD method, followed by the type-IIa natural diamond, and finally, the CVD diamond grown by the DC are jet technique. C1 NORTHROP GRUMMAN CORP,BETHPAGE,NY 11714. RP Souw, EK (reprint author), BROOKHAVEN NATL LAB,BLDG 70I,UPTON,NY 11973, USA. NR 43 TC 56 Z9 57 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 21 PY 1997 VL 400 IS 1 BP 69 EP 86 DI 10.1016/S0168-9002(97)00963-7 PG 18 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK334 UT WOS:A1997YK33400007 ER PT J AU Biggeri, U Borchi, E Bruzzi, M Pirollo, S Sciortino, S Lazanu, S Li, Z AF Biggeri, U Borchi, E Bruzzi, M Pirollo, S Sciortino, S Lazanu, S Li, Z TI Hall effect measurements on proton-irradiated ROSE samples SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Bulk samples obtained from two wafers of a silicon monocrystal material produced by float-zone refinement have been analysed using the four-point probe method. One of the two wafers comes from an oxygenated ingot; two sets of pure and oxygenated samples have been irradiated with 24 GeV/c protons in the fluence range from 10(13) to 1.74 x 10(14) p/cm(2). Van der Pauw resistivity and Hall coefficient have been measured before and after irradiation as a function of the temperature. A thermal treatment (30 min at 100 degrees C) has been performed to accelerate the reverse annealing effect in the irradiated silicon. The irradiated samples show the same exponential dependence of the resistivity and of the Hall coefficient on the temperature corresponding to the presence of radiation-induced deep energy levels around 0.6-0.7 eV in the silicon gap. The free carrier concentrations (n, p) have been evaluated in the investigated fluence range. The inversion of the conductivity type from n to p occurred, respectively, at 7 x 10(13) and at 4 x 10(13) p/cm(2) before and after the annealing treatment for both the two sets. Only slight differences have been detected between the pure and the oxygenated samples. C1 IST NAZL FIS NUCL,I-50139 FLORENCE,ITALY. DIPARTIMENTO ENERGET SERGIO STECCO,I-50139 FLORENCE,ITALY. INST PHYS & TECHNOL MAT,BUCHAREST,ROMANIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Lazanu, Sorina/B-7819-2012; Bruzzi, Mara/K-1326-2015; OI Lazanu, Sorina/0000-0003-0390-0779; Bruzzi, Mara/0000-0001-7344-8365; Sciortino, Silvio/0000-0003-0570-7489 NR 6 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 21 PY 1997 VL 400 IS 1 BP 113 EP 123 DI 10.1016/S0168-9002(97)00930-3 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK334 UT WOS:A1997YK33400012 ER PT J AU Bonifacio, R AF Bonifacio, R TI Classical bunching contribution in the photon statistics of a high-gain FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID FREE-ELECTRON LASER; QUANTUM INITIATION; INSTABILITIES AB In a previous paper we have calculated quantum mechanically the photon statistics of a high-gain FEL in the exponential SASE regime started only by the quantum fluctuations. In this paper we extend the previous calculation to include the effect of a properly defined ''classical bunching'' and the presence of many coherence lengths in the electron bunch. The new concept of Quantum SASE is defined. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 21 PY 1997 VL 400 IS 1 BP 165 EP 169 DI 10.1016/S0168-9002(97)00988-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK334 UT WOS:A1997YK33400018 ER PT J AU Akerib, DS DaSilva, A Hurley, DL Pritychenko, B Sadoulet, B Smith, A AF Akerib, DS DaSilva, A Hurley, DL Pritychenko, B Sadoulet, B Smith, A TI Production of solder and flux with low radioactivity SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter ID DARK-MATTER AB The problem of radioactivity in solder has been studied. A low-radioactive rosin-core solder has been produced. Low-radioactive alternatives for rosin-based flux have also been considered. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 4 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 21 PY 1997 VL 400 IS 1 BP 181 EP 183 DI 10.1016/S0168-9002(97)01031-0 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YK334 UT WOS:A1997YK33400022 ER PT J AU Aeppli, G Mason, TE Hayden, SM Mook, HA Kulda, J AF Aeppli, G Mason, TE Hayden, SM Mook, HA Kulda, J TI Nearly singular magnetic fluctuations in the normal state of a high-T-c cuprate superconductor SO SCIENCE LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; BEHAVIOR; DYNAMICS; LA1.86SR0.14CUO4; LA1.85SR0.15CUO4; ANTIFERROMAGNETS; SUSCEPTIBILITY; LA2-XSRXCUO4; EXCITATIONS; SCATTERING AB Polarized and unpolarized neutron scattering was used to measure the wave vector-and frequency-dependent magnetic fluctuations in the normal state (from the superconducting transition temperature, T-c = 35 kelvin, up to 350 kelvin) of single crystals of La1.86Sr0.14CuO4. The peaks that dominate the fluctuations have amplitudes that decrease as T-2 and widths that increase in proportion to the thermal energy, k(B)T (where k(B) is Boltzmann's constant), and energy transfer added in quadrature. The nearly singular fluctuations are consistent with a nearby quantum critical point. C1 UNIV TORONTO, DEPT PHYS, TORONTO, ON M5S 1A7, CANADA. NEC RES INST, PRINCETON, NJ 08540 USA. RISO NATL LAB, DK-4000 ROSKILDE, DENMARK. UNIV BRISTOL, DEPT PHYS, BRISTOL BS8 1TL, AVON, ENGLAND. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. RI Hayden, Stephen/F-4162-2011; Mason, Thomas/M-5809-2014; Kulda, Jiri/G-8667-2016 OI Hayden, Stephen/0000-0002-3209-027X; Mason, Thomas/0000-0003-1880-3971; Kulda, Jiri/0000-0002-0570-0570 NR 36 TC 241 Z9 241 U1 3 U2 24 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD NOV 21 PY 1997 VL 278 IS 5342 BP 1432 EP 1435 DI 10.1126/science.278.5342.1432 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YG858 UT WOS:A1997YG85800035 ER PT J AU Bai, GR Wang, A Foster, CM Vetrone, J AF Bai, GR Wang, A Foster, CM Vetrone, J TI Low-temperature growth and orientational control in RuO2 thin films by metal-organic chemical vapor deposition SO THIN SOLID FILMS LA English DT Article DE ruthenium oxide; thin films; chemical vapor deposition ID SPUTTERED RUTHENIUM DIOXIDE; ELECTRICAL-PROPERTIES; BOTTOM ELECTRODES; CAPACITORS; FATIGUE; HETEROSTRUCTURES AB For growth temperatures in the range of 275 degrees C to 425 degrees C, highly conductive RuO2 thin films with either (110)- or (101)-textured orientations have been grown by metal-organic chemical vapor deposition (MOCVD) on both SiO2/Si(001) and Pt/Ti/SiO2/Si(001) substrates. Both the growth temperature and growth rate were used to control the type and degree of orientational texture of the RuO2 films. In the upper part of this growth temperature range (similar to 350 degrees C) and at a low growth rate (< 3.0 nm/min.), the RuO2 films favored a (110)-textured orientation. In contrast, at the lower part of this growth temperature range (similar to 300 degrees C) and at a high growth rate (> 3.0 nm/min.), the RuO, films favored a (101)-textured orientation. In contrast, higher growth temperatures (> 425 degrees C) always produced randomly-oriented polycrystalline films. For either of these low-temperature growth processes, the films produced were crack-free, well-adhered to the substrates, and had smooth, specular surfaces. Atomic force microscopy showed that the films had a dense microstructure with an average grain size of 50-80 nm and a rms. surface roughness of similar to 3-10 nm. Four-probe electrical transport measurements showed that the films were highly conductive with resistivities of 34-40 mu Omega-cm (at 25 degrees C). Published by Elsevier Science S.A. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Foster, CM (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 35 TC 42 Z9 42 U1 1 U2 6 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 21 PY 1997 VL 310 IS 1-2 BP 75 EP 80 DI 10.1016/S0040-6090(97)00353-2 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YY297 UT WOS:000072133000012 ER PT J AU Ruffner, JA Tuenge, RT Sun, SS Grandon, PD Hlava, PF AF Ruffner, JA Tuenge, RT Sun, SS Grandon, PD Hlava, PF TI Sputter deposition of ZnS : Mn/SrS : Ce multilayered thin film white phosphor SO THIN SOLID FILMS LA English DT Article DE luminescence; multilayers; sputtering; sulphides ID MN AB A full color thin film electroluminescent (TFEL) display can be fabricated by using color filters in combination with a high efficiency 'white' phosphor, such as a thin film multilayered stack of ZnS:Mn and SrS:Ce (denoted ZnS:Mn/SrS:Ce). To date, deposition of these multilayers has been limited to vacuum evaporation techniques and atomic layer epitaxy, both of which require different substrate temperatures for growth of high quality ZnS:Mn and SrS:Ce. This repeated thermal cycling during multilayer deposition can adversely affect electroluminescent (EL) performance and manufacturability. Sputter deposition of ZnS:Nln and SrS:Ce produces high quality phosphors for a wider range of substrate temperatures. We have determined a common set of radio frequency (rf) sputter deposition parameters for ZnS:Mn and SrS:Ce that result in high performance, multilayered white phosphors for use in TFEL devices. The EL performance of our samples is comparable to the best performance reported for evaporated multilayered samples. The major improvement is that the rf sputtered ZnS:Mn and SrS:Ce layers were deposited at the same substrate temperature. We report on the effects of sputter deposition parameters on the resultant composition and morphology of ZnS:Mn and SrS:Ce thin films and multilayers. Their EL performance was evaluated and correlated to composition and morphology. (C) 1997 Elsevier Science S.A. C1 Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA. Planar Amer, Beaverton, OR 97006 USA. Ktech, Albuquerque, NM 87106 USA. RP Ruffner, JA (reprint author), Sandia Natl Labs, Adv Mat Lab, 1001 Univ Blvd SE,Suite 100, Albuquerque, NM 87106 USA. NR 33 TC 13 Z9 15 U1 1 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 21 PY 1997 VL 310 IS 1-2 BP 123 EP 131 DI 10.1016/S0040-6090(97)00372-6 PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YY297 UT WOS:000072133000020 ER PT J AU MacKerrow, EP Schmitt, MJ Thompson, DC AF MacKerrow, EP Schmitt, MJ Thompson, DC TI Effect of speckle on lidar pulse-pair ratio statistics SO APPLIED OPTICS LA English DT Article DE laser speckle; differential absorption lidar; correlation area; averaging statistics; pulse-pair ratio; gamma distribution; albedo; remote sensing ID DIFFERENTIAL ABSORPTION LIDAR; LONG-PATH SYSTEMS; ERRORS AB The ratio of temporally adjacent lidar pulse returns is commonly used in differential absorption Lidar (DIAL) to reduce correlated noise. These pulses typically are generated at different wavelengths with the assumption that the dominant noise is common to hath. This is not the case when the mean number of laser speckle integrated per pulse by the lidar receiver is small (namely, less than 10 speckles at each wavelength). In this case a large increase in the standard deviation of the ratio data results. We demonstrate this effect both theoretically and experimentally. The theoretical value for the expected standard deviation of the pulse-pair ratio data compares well with the measured values that used a dual CO2 laser-based lidar with a hard target. Pulse averaging statistics of the pulse-pair data obey the expected sigma(1)/root N reduction in the standard deviation, sigma(N), for N-pulse averages. We consider the ratio before average, average before ratio, and log of the ratio before average methods for noise reduction in the lidar equation. The implications of our results are discussed in the context of dual-laser versus single-laser lidar configurations. (C) 1997 Optical Society of America. C1 LOS ALAMOS NATL LAB,CHEM SCI & TECHNOL DIV,LOS ALAMOS,NM 87545. RP MacKerrow, EP (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,XCM,MAIL STOP E543,LOS ALAMOS,NM 87545, USA. NR 32 TC 7 Z9 7 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 20 PY 1997 VL 36 IS 33 BP 8650 EP 8669 DI 10.1364/AO.36.008650 PG 20 WC Optics SC Optics GA YF886 UT WOS:A1997YF88600021 PM 18264416 ER PT J AU Stancil, PC Dalgarno, A AF Stancil, PC Dalgarno, A TI The radiative association of H and D SO ASTROPHYSICAL JOURNAL LA English DT Article DE atomic processes; early universe ID MOLECULE; ENERGIES; SPECTRUM; HYDROGEN; LINE; H-2 AB The formation of the deuterated hydrogen molecule HD by the radiative association of H and D is investigated. Spontaneous association and stimulated association in a blackbody radiation field are considered. For a collision temperature of 1000 K, the rate coefficient for spontaneous radiative association is 1.0 x 10(-26) cm(3) s(-1). At the same collision temperature, the rate coefficient is enhanced by stimulated association to 1.8 x 10(-26) cm(3) s(-1) for a radiation temperature of 10,000 K. The role of radiative association in the deuterium chemistry of the early universe is discussed. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP Stancil, PC (reprint author), OAK RIDGE NATL LAB,DIV PHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 18 TC 26 Z9 26 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP 76 EP 78 DI 10.1086/304878 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YG999 UT WOS:A1997YG99900009 ER PT J AU Park, HS Ables, E Band, DL Barthelmy, SD Bionta, RM Butterworth, PS Cline, TL Ferguson, DH Fishman, GJ Gehrels, N Hurley, K Kouveliotou, C Lee, BC Meegan, CA Ott, LL Parker, EL AF Park, HS Ables, E Band, DL Barthelmy, SD Bionta, RM Butterworth, PS Cline, TL Ferguson, DH Fishman, GJ Gehrels, N Hurley, K Kouveliotou, C Lee, BC Meegan, CA Ott, LL Parker, EL TI Real-time optical flux limits from gamma-ray bursts measured by the gamma-ray optical counterpart search experiment SO ASTROPHYSICAL JOURNAL LA English DT Article DE gamma rays, bursts ID RELATIVISTIC FIREBALLS; X-RAY; SPECTRA; MODELS; RADIATION; EMISSION; ENERGY; GRB AB The Gamma-Ray Optical Counterpart Search Experiment presents new experimental upper limits on the optical flux from gamma-ray bursts (GRBs). Our experiment consisted of a fully automated very wide-held opto-electronic detection system that imaged locations of GRBs within a few seconds of receiving trigger signals provided by BATSE's real-time burst coordinate distribution network. The experiment acquired 3800 observing hours, recording 22 gamma-ray burst triggers within similar to 30 s of the start of the burst event. Some of these bursts were imaged while gamma-ray radiation was being detected by BATSE. We identified no optical counterparts associated with gamma-ray bursts among these events at the m(V) similar to 7.0-8.3 sensitivity level. We find the ratio of the upper limit to the V-band optical flux, F-nu, to the gamma-ray fluence, Phi(gamma), from these data to be 1 x 10(-18) < F-nu/Phi(gamma) < 2 x 10(-16). C1 UNIV CALIF SAN DIEGO,CASS 0424,LA JOLLA,CA 92093. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV SPACE RES ASSOC,COLUMBIA,MD. CALIF STATE UNIV HAYWARD,DEPT PHYS,HAYWARD,CA 94542. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. RP Park, HS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Gehrels, Neil/D-2971-2012; Barthelmy, Scott/D-2943-2012 NR 56 TC 13 Z9 13 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP 99 EP 108 DI 10.1086/304860 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YG999 UT WOS:A1997YG99900012 ER PT J AU Hale, DDS Bester, M Danchi, WC Hoss, S Lipman, E Monnier, JD Tuthill, PG Townes, CH Johnson, M Lopez, B Geballe, TR AF Hale, DDS Bester, M Danchi, WC Hoss, S Lipman, E Monnier, JD Tuthill, PG Townes, CH Johnson, M Lopez, B Geballe, TR TI Multiple dust shells and motions around IK Tauri as seen by infrared interferometry SO ASTROPHYSICAL JOURNAL LA English DT Article DE infrared, stars; stars, circumstellar matter; stars, imaging; stars, individual (IK Tauri); stars, mass loss; stars, oscillations ID STARS; POSITIONS; MASERS AB A visibility curve of IK Tau has been measured with the ISI, an 11 mu m stellar interferometer, over a period of several years. Time variations in 11 mu m flux were also measured. The results indicate an approximately periodic distribution of dust shells around the star, with shells separated by 200-250 mas and a diameter of about 200 mas for the innermost shell. Some shell motion has been detected, and if velocities are the same as those measured for CO gas and OH masers, the motion implies that the distance to IK Tau is about 265 pc and that shells have been emitted at times separated by about 12 yr, which is considerably longer than the star's luminosity period of 470 days. C1 UNIV PITTSBURGH,ALLEGHENY OBSERV,OBSERV STN,PITTSBURGH,PA 15214. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OBSERV COTE AZUR,UMR 6528,F-06304 NICE 4,FRANCE. JOINT ASTRON CTR,HILO,HI 96720. RP Hale, DDS (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. RI Lipman, Everett/D-1696-2009 NR 11 TC 36 Z9 36 U1 1 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP 407 EP 411 DI 10.1086/512794 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YG999 UT WOS:A1997YG99900042 ER PT J AU Alcock, C Allsman, RA Alves, DR Axelrod, TS Becker, AC Bennett, DP Cook, KH Freeman, KC Griest, K Lehner, MJ Marshall, SL Minniti, D Peterson, BA Pratt, MR Quinn, PJ Rodgers, AW Rorabeck, A Stubbs, CW Sutherland, W Tomaney, AB Vandehei, T Welch, DL AF Alcock, C Allsman, RA Alves, DR Axelrod, TS Becker, AC Bennett, DP Cook, KH Freeman, KC Griest, K Lehner, MJ Marshall, SL Minniti, D Peterson, BA Pratt, MR Quinn, PJ Rodgers, AW Rorabeck, A Stubbs, CW Sutherland, W Tomaney, AB Vandehei, T Welch, DL TI Is the Large Magellanic Cloud microlensing due to an intervening dwarf galaxy? SO ASTROPHYSICAL JOURNAL LA English DT Article DE galaxies, individual (Large Magellanic Cloud, Sagittarius); Galaxy, halo; stars, individual (RR Lyrae); stars, variables, other ID LMC CLUSTERS; VELOCITIES; ABUNDANCES; STARS; SPECTROSCOPY; SAGITTARIUS; EVOLUTION; GIANTS; HALO AB The recent suggestion that the microlensing events observed toward the Large Magellanic Cloud are due to an intervening Sgr-like dwarf galaxy is examined. A search for foreground RR Lyrae in the MACHO photometry database yields 20 stars whose distance distribution follow the expected halo density profile. Cepheid and red giant branch clump stars in the MACHO database are consistent with membership in the LMC. There is also no evidence in the literature for a distinct kinematic population, for intervening gas, or for the turnoff of such a hypothetical galaxy. We conclude that if the lenses are in a foreground galaxy, it must be a particularly dark galaxy. C1 UNIV CALIF BERKELEY, CTR PARTICLE ASTROPHYS, BERKELEY, CA 94720 USA. AUSTRALIAN NATL UNIV, MT STROMLO & SIDING SPRING OBSERV, WESTON, ACT 2611, AUSTRALIA. UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. UNIV WASHINGTON, DEPT ASTRON, SEATTLE, WA 98195 USA. UNIV NOTRE DAME, DEPT PHYS, NOTRE DAME, IN 46556 USA. UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. EUROPEAN SO OBSERV, D-85748 GARCHING, GERMANY. MCMASTER UNIV, DEPT PHYS & ASTRON, HAMILTON, ON L8S 4M1, CANADA. UNIV OXFORD, DEPT PHYS, CLARENDON LAB, OXFORD OX1 3RH, ENGLAND. RP Alcock, C (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RI Stubbs, Christopher/C-2829-2012; Quinn, Peter/B-3638-2013; OI Stubbs, Christopher/0000-0003-0347-1724; Lehner, Matthew/0000-0003-4077-0985 NR 35 TC 30 Z9 30 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP L59 EP L63 DI 10.1086/311016 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YH001 UT WOS:A1997YH00100015 ER PT J AU Bershady, MA Majewski, SR Koo, DC Kron, RG Munn, JA AF Bershady, MA Majewski, SR Koo, DC Kron, RG Munn, JA TI The luminosity function for L>L* galaxies at z>3 SO ASTROPHYSICAL JOURNAL LA English DT Article DE galaxies, luminosity function, mass function; galaxies, evolution; galaxies, distances and redshifts ID HIGH-REDSHIFT GALAXIES; HUBBLE DEEP FIELD; LYMAN LIMIT; QSO FIELDS; POPULATION; COLORS AB Through the use of multiband (U, B-j, R-F, I-N) photometry we have isolated high-redshift (3.0 < z < 3.5) galaxy candidates in surveys of 1.27 deg(2) to R-F = 21.25 and 0.02 deg(2) to R-F = 23.5. Our pool of candidates constrains the nature of the 3.0 < z < 3.5 luminosity function over the range L* less than or similar to L less than or similar to 100L* if we grant a similar level of completeness to these data as for very faint samples (to R = 25.5) selected in a similar fashion. Our constraints agree with the high-redshift sky density at R-F = 20.5 estimated from Yee et al.'s serendipitous discovery of a bright, z = 2.7 galaxy, as well as the density at R-F approximate to 23 by Steidel et al. We strongly rule out-by more than 2 orders of magnitude at M-RF = -25-the L > L* luminosity function for z = 3-5 galaxies obtained by a photometric redshift analysis of the Hubble deep field (HDF) by Gwyn & Hartwick. Our results at R-F approximate to 23 are more consistent with the photometric redshift analysis of the faint HDF galaxies by Sawicki, Lin, & Yee, but our present upper limits at the brightest magnitudes (R-F < 21.5, M-RF < -24) allow more generous volume densities of these super-L* galaxies. C1 UNIV WISCONSIN, DEPT ASTRON, MADISON, WI 53706 USA. UNIV VIRGINIA, DEPT ASTRON, CHARLOTTESVILLE, VA 22903 USA. UNIV CALIF SANTA CRUZ, UNIV CALIF OBSERV, LICK OBSERV, BOARD STUDIES ASTRON & ASTROPHYS, SANTA CRUZ, CA 95064 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. USN OBSERV, FLAGSTAFF STN, FLAGSTAFF, AZ 86002 USA. RP Bershady, MA (reprint author), PENN STATE UNIV, DEPT ASTRON & ASTROPHYS, 525 DAVEY LAB, UNIVERSITY PK, PA 16802 USA. NR 29 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP L41 EP L45 DI 10.1086/310995 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YH001 UT WOS:A1997YH00100011 ER PT J AU Park, HS Williams, GG Ables, E Band, DL Barthelmy, SD Bionta, R Butterworth, PS Cline, TL Ferguson, DH Fishman, GJ Gehrels, N Hartmann, D Hurley, K Kouveliotou, C Meegan, CA Ott, L Parker, E Wurtz, R AF Park, HS Williams, GG Ables, E Band, DL Barthelmy, SD Bionta, R Butterworth, PS Cline, TL Ferguson, DH Fishman, GJ Gehrels, N Hartmann, D Hurley, K Kouveliotou, C Meegan, CA Ott, L Parker, E Wurtz, R TI New constraints on simultaneous optical emission from gamma-ray bursts measured by the Livermore Optical Transient Imaging System experiment SO ASTROPHYSICAL JOURNAL LA English DT Article DE gamma rays, bursts ID BATSE AB LOTIS is a gamma-ray burst optical counterpart search experiment located near Lawrence Livermore National Laboratory in California. Since operations began in 1996 October, LOTIS has responded to five triggers as of 1997 July 30, which occurred during good weather conditions. GRB 970223 (BATSE trigger 6100) was an exceptionally strong burst, lasting similar to 30 s with a peak at similar to 8 s. LOTIS began imaging the error box similar to 11 s after the burst began and achieved simultaneous optical coverage of 100% of the region enclosed by the BATSE 3 sigma error circle and the interplanetary network annulus. No optical transients were observed brighter than the m(V) similar to 11 completeness limit of the resulting images, providing a new upper limit on the ratio of simultaneous optical to gamma-ray fluence of R-L < 1.1 x 10(-4) and on the ratio of simultaneous optical (at 700 nm) to gamma-ray (at 100 keV) flux density of R-F < 305 for a B-type spectrum and R-F < 475 for an M-type spectrum. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. UNIV CALIF SAN DIEGO,CASS 0424,LA JOLLA,CA 92093. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV SPACE RES ASSOC,COLUMBIA,MD. CALIF STATE UNIV HAYWARD,DEPT PHYS,HAYWARD,CA 94542. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP Park, HS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Gehrels, Neil/D-2971-2012; Barthelmy, Scott/D-2943-2012 NR 18 TC 18 Z9 18 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP L21 EP L24 DI 10.1086/311020 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YH001 UT WOS:A1997YH00100006 ER PT J AU Ryutova, M AF Ryutova, M TI Estimate of the energy flux from time-distance analysis SO ASTROPHYSICAL JOURNAL LA English DT Article DE sun, oscillations; sun, photosphere AB In this Letter we show that time-distance measurements in helioseismology can be used to estimate the energy flux on the solar surface. Nonreciprocity of travel time along the ray path and different parity properties of sound speed, how velocity, and magnetic field allow one to obtain information on large-scale distribution of plasma flows and magnetic fields. Hen we extend our analysis and show that the covariance of sum and difference of the reciprocal travel times is a measure of large-scale, ''climatological'' heat flux and that the covariance of sum and difference of their departures from the mean gives an estimate for the magnetic energy flux. Using the reciprocal travel times measured in north-south and west-east directions, one can estimate the latitude-and longitude-dependent energy fluxes. The possibility of estimating the ''eddy'' fluxes, the heat and magnetic energy transport provided by small-scale motions, is outlined. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP Ryutova, M (reprint author), STANFORD UNIV,STANFORD,CA 94305, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1997 VL 490 IS 1 BP L111 EP & DI 10.1086/310996 PN 2 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YH001 UT WOS:A1997YH00100027 ER PT J AU Elston, RA Drum, AS Pearson, WH Parker, K AF Elston, RA Drum, AS Pearson, WH Parker, K TI Health and condition of Pacific herring Clupea pallasi from Prince William Sound, Alaska, 1994 SO DISEASES OF AQUATIC ORGANISMS LA English DT Article DE Pacific herring; health; condition; diseases; Prince William Sound; environmental impact; 'Exxon Valdez' oil spill ID HARENGUS-PALLASI; USA AB This study determined baseline health and condition values of Pacific herring Clupea pallasi in 1994 in Prince William Sound (PWS), Alaska. In April 1994, 134 herring were collected from 3 spawning sites in PWS, including a sequential sampling from 1 site. For each herring, morphometric characteristics, sex and presence of gross external and internal lesions were documented, and samples were processed for aging, virological, bacteriological and histological analysis. The study did not reveal trends in herring health and condition in 1994 that could reasonably be attributed to the 'Exxon Valdez' oil spill in 1989. No viruses or pathogenic bacteria were detected, but herring worms, a coccidian parasite and a systemic and virulent fungal infection were found in the herring. The degree of vacuolation in liver cells, previously thought to indicate exposure of fish to oil, varied significantly with the stage of reproductive development of the herring. Similarly, the liver melanomacrophage index, also believed to be correlated with environmental toxicant exposures, varied significantly among sample locations and with collection date. In this study, significant differences in age distribution of spawning herring populations occur in close geographic proximity and collection time intervals in PWS. Based on our results, the use of condition factor, disease and indices of liver function to indicate pollutant exposure are likely to be invalid unless other factors unrelated to pollutant exposure are taken into account, such as reproductive stage of the herring, spawning behavior and location, age of herring and collection date. Thus, we conclude that various hypotheses advanced regarding impacts of the 'Exxon Valdez' oil spill as well as other cases of environmental contamination cannot be supported without rigorous statistical evaluation of natural variations in indices of fish health and condition. C1 AquaTech Inc, Carlsborg, WA 98324 USA. Battelle Marine Sci Lab, Sequim, WA 98382 USA. Data Anal Grp, Cloverdale, CA 95425 USA. RP Elston, RA (reprint author), AquaTech Inc, POB 687, Carlsborg, WA 98324 USA. NR 30 TC 15 Z9 20 U1 0 U2 6 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0177-5103 J9 DIS AQUAT ORGAN JI Dis. Aquat. Org. PD NOV 20 PY 1997 VL 31 IS 2 BP 109 EP 126 DI 10.3354/dao031109 PG 18 WC Fisheries; Veterinary Sciences SC Fisheries; Veterinary Sciences GA YQ493 UT WOS:000071393300005 ER PT J AU Hegg, DA Livingston, J Hobbs, PV Novakov, T Russell, P AF Hegg, DA Livingston, J Hobbs, PV Novakov, T Russell, P TI Chemical apportionment of aerosol column optical depth off the mid-Atlantic coast of the United States SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID DIFFUSION DENUDER SAMPLER; ATMOSPHERIC AEROSOLS; VERTICAL PROFILES; GREENHOUSE GASES; EXTINCTION; PARTICLE; CLIMATE; RELEVANT; SULFATE; SYSTEM AB Aerosol column optical depths derived from airborne Sun photometer and in situ measurements of aerosol properties in 14 vertical profiles off the mid-Atlantic coast of the United States in June show excellent agreement. Simultaneous measurements of the chemical compositions of the aerosol allows an assessment of the chemical apportionment of the aerosol column optical depths. The optical depths had essentially three chemical components, which, in order of descending average contributions, were condensed water, carbonaceous species, and sulfate. These results do not support the common assumption that sulfate dominates aerosol optical depths in polluted regions. C1 SRI INT, MENLO PK, CA 94025 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP Hegg, DA (reprint author), UNIV WASHINGTON, DEPT ATMOSPHER SCI, BOX 351640, SEATTLE, WA 98195 USA. NR 41 TC 203 Z9 204 U1 0 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1997 VL 102 IS D21 BP 25293 EP 25303 DI 10.1029/97JD02293 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA YH548 UT WOS:A1997YH54800003 ER PT J AU Benkovitz, CM Schwartz, SE AF Benkovitz, CM Schwartz, SE TI Evaluation of modeled sulfate and SO2 over North America and Europe for four seasonal months in 1986-1987 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID TROPOSPHERIC SULFUR CYCLE; LONG-RANGE TRANSPORT; GREENHOUSE GASES; ANTHROPOGENIC AEROSOLS; CLIMATE RESPONSE; 3-DIMENSIONAL MODEL; ADVECTION SCHEME; UNCERTAINTY; DEPOSITION; EMISSIONS AB A three-dimensional Eulerian transport and transformation model driven by observation-derived synoptic meteorological data has been applied to calculate mixing ratios (MRs) of sulfate and SO2 and wet deposition of sulfate over the North Atlantic and adjacent continental regions for 1-month periods in each of four seasons in 1986-1987. Model performance is evaluated by comparison of grid-cell average (1.125 degrees) modeled MRs for sulfate (24-hour average) and SO2 (6- and 24-hour average) in the lowest model level (surface to similar to 65 m) to surface MRs observed at monitoring stations in North America and Europe. For sulfate similar to 8000 model-observation comparisons were made employing similar to 10,000 individual measurements; for 24-hour SO 2, 21,000 comparisons (54,000 measurements) and for 6-hour SO2, similar to 71,000 comparisons (211,000 measurements). Subgrid variation of observed MRs is inferred from the spread of multiple simultaneous measurements within individual grid cells. The median spread of the observed MRs is a factor of 1.5 for 24-hour sulfate and 2.2 for 24-hour SO2. The median spread between observed and modeled MRs is a factor of 2.3 for sulfate and 2.1 for 24-hour SO2, comparable to that for the observations themselves. This suggests that much of the departure between modeled and observed MRs can be attributed to subgrid spatial variation and nonrepresentative sampling of model grid cells at the stations used for the comparisons, For SO2 the median ratio of modeled to observed MRs is 0.97, with little seasonal variation, somewhat lower in North America but considerably higher in Europe; little difference was evidenced in comparisons of 6-hour averages versus 24-hour averages. For sulfate the median ratio is 0.51, with the range for the four simulation periods 0.36 to 0.66, lowest in January-February 1987, and with comparable values for Europe and North America. For all four simulations the time series of 24-hour average modeled MRs at most locations rather closely reproduce the magnitudes and temporal episodicity of the observed sulfate and SO2 MRs. Analysis of correlations of observed and modeled MRs was carried out for all grid cell locations for which at least 25 days of observations were available in a simulation period; 76% of 203 correlations for 24-hour sulfate and 51% of 526 correlations for 24-hour SO2 were significant at the 95% confidence level. The superior model performance in this respect for sulfate is attributed to the lower subgrid variation in the mixing ratio of this mainly secondary atmospheric species versus the mainly primary emitted species SO2. Comparisons of modeled and observed sulfate wet deposition (concentration times precipitation amount) for similar to 300 daily and similar to 1100 weekly samples, all in North America, indicate a median spread between modeled and observed deposition of a factor of 2.6 and a median ratio of modeled to observed deposition of 0.82. The major contributor to model underestimation of sulfate MR in air is tentatively attributed to the lack of representation in the model of the aqueous-phase conversion of SO2 to sulfate in nonprecipitating clouds. RP Benkovitz, CM (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, BLDG 815E, UPTON, NY 11973 USA. RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 70 TC 33 Z9 33 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1997 VL 102 IS D21 BP 25305 EP 25338 DI 10.1029/97JD02211 PG 34 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA YH548 UT WOS:A1997YH54800004 ER PT J AU Clerc, DG Poshusta, RD Hess, AC AF Clerc, DG Poshusta, RD Hess, AC TI Periodic Hartree-Fock study of LixTiS2, 0<=x<=1: The structural, plastic, and electronic effects of lithium intercalation in TiS2 SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID TRANSITION-METAL DICHALCOGENIDES; BASIS-SET; PRESSURE; PHASES; OXIDE; MOS2 AB The structural and electronic properties of the intercalation compound LixTiS2, x = 1/4, 3/4, and 1, are investigated at the ab initio, all-electron, periodic Hartree-Fock level, using an extended basis set and a posteriori density functional correlation corrections to the total energy, Calculated lattice parameters, bulk moduli, linear moduli, cohesive energy, elastic constants, band structure? density of states, and Mulliken populations are reported. This study indicates that the following physical changes in LixTiS2 are induced by intercalation. (1) The crystal expands uniaxially in the (c) over right arrow direction. (2) The S-Ti-S layers expand negligibly (<0.01 Angstrom) in the (c) over right arrow direction at x = 1/4, but a large (0.16 Angstrom) layer expansion occurs at x = 1. (3) The elastic properties change negligibly at x = 1/4, but the interlayer stiffness c(33) increases by a factor of similar to 4 at x = 1. (4) Lithium charge is donated to the S(3p) and Ti(3d) orbitals. At least 75% of this charge is acquired by sulfur atoms. (5) At x = 1/4, the donated charge is localized over the lithium near-neighbor S(3p) and Ti(3d) orbitals. (6) Charge transfer to a Ti(3d)-based conduction band yields metallic properties. C1 PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RP Clerc, DG (reprint author), WASHINGTON STATE UNIV, MAT SCI PROGRAM, PULLMAN, WA 99164 USA. NR 34 TC 13 Z9 13 U1 2 U2 21 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 20 PY 1997 VL 101 IS 47 BP 8926 EP 8931 DI 10.1021/jp9618789 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YH530 UT WOS:A1997YH53000024 ER PT J AU Totir, DA Bae, IT Hu, YN Antonio, MR Stan, MA Scherson, DA AF Totir, DA Bae, IT Hu, YN Antonio, MR Stan, MA Scherson, DA TI In situ Fe K-edge X-ray absorption fine structure of a pyrite electrode in a Li/polyethylene oxide(LiClO4)/FeS2 battery environment SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID TEMPERATURE LITHIUM BATTERIES; FE-57 MOSSBAUER-SPECTROSCOPY; POLYMER ELECTROLYTE; CATHODES; CRYSTAL; SYSTEM AB Electronic and structural properties of materials generated by the reduction and subsequent oxidation of pyrite (FeS2) In a Li+-based solid polymer electrolyte (SPE) have been examined in situ by fluorescence Fe K-edge X-ray absorption fine structure (XAFS) in a Li/SPE/FeS2 battery environment. The in situ X-ray absorption near edge structure (XANES) of fully, i.e., four-electron, discharged FeS2 displayed features consistent with the presence of metallic iron, in agreement with information derived from in situ X-ray diffraction (XRD) and in situ Fe-57 Mossbauer effect spectroscopy (MES) reported by other groups. The two-electron reoxidation (half-recharge) of such fully reduced material yielded an in situ XANES very similar to that of genuine crystalline Li2FeS2 prepared and characterized in this laboratory. These spectroscopic findings support conclusions made purely on the basis of electrochemical information, which identified Li2FeS2 as an intermediate in the charge-discharge mechanism of FeS2 in room-temperature Li+-containing electrolytes. C1 CASE WESTERN RESERVE UNIV,DEPT CHEM,CLEVELAND,OH 44106. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106. NR 19 TC 28 Z9 28 U1 2 U2 30 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 20 PY 1997 VL 101 IS 47 BP 9751 EP 9756 DI 10.1021/jp971470r PG 6 WC Chemistry, Physical SC Chemistry GA YH531 UT WOS:A1997YH53100012 ER PT J AU Waldfried, C Welipitiya, D Hutchings, CW deSilva, HSV Gallup, GA Dowben, PA Pai, WW Zhang, JD Wendelken, JF Boag, NM AF Waldfried, C Welipitiya, D Hutchings, CW deSilva, HSV Gallup, GA Dowben, PA Pai, WW Zhang, JD Wendelken, JF Boag, NM TI Preferential bonding orientations of ferrocene on surfaces SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; ELECTRONIC-STRUCTURE; PHOTOELECTRON-SPECTROSCOPY; SYNCHROTRON-RADIATION; IONIZATION-POTENTIALS; ORGANOMETALLIC COMPOUNDS; MOLECULAR-ORIENTATION; AZIMUTHAL ORIENTATION; LEAD PHTHALOCYANINE; ORGANIC-MOLECULES AB We have measured the molecular orientation and bonding of adsorbed ferrocene on Ag(100) and Cu(100) using angle-resolved photoemission spectroscopy (ARPES). The results for molecular adsorption on Ag(100) are complemented by high-resolution electron energy loss spectroscopy (HREELS) measurements and ab initio calculations for the ferrocene vibrational modes. The measurements indicate that ferrocene adsorbs on Ag(100) with the molecular axis perpendicular to the surface. In contrast, as indicted using ARPES and scanning tunneling microscopy, ferrocene adsorbed on the Cu(100) surface is oriented with the molecular axis parallel with the surface. Model calculations allow us to assign all of the observed vibrational modes for the weakly bound molecular ferrocene on Ag(100)-both dipole and impact scattering modes have been observed. C1 UNIV NEBRASKA,DEPT PHYS & ASTRON,LINCOLN,NE 68588. UNIV NEBRASKA,CTR MAT RES & ANAL,LINCOLN,NE 68588. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV SALFORD,DEPT CHEM,SALFORD M5 4WT,LANCS,ENGLAND. NR 66 TC 28 Z9 28 U1 1 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 20 PY 1997 VL 101 IS 47 BP 9782 EP 9789 DI 10.1021/jp972496l PG 8 WC Chemistry, Physical SC Chemistry GA YH531 UT WOS:A1997YH53100016 ER PT J AU Frazier, N Brown, BA Millener, DJ Zelevinsky, V AF Frazier, N Brown, BA Millener, DJ Zelevinsky, V TI Gamow-Teller strength as a function of excitation energy SO PHYSICS LETTERS B LA English DT Article ID NUCLEAR SHELL-MODEL; SD-SHELL; QUANTUM CHAOS; PF SHELL; SN-100; SPIN AB We study the dependence of the total Gamow-Teller strength in an N=Z nucleus (Mg-24) as a function of excitation energy within a complete O (h) over bar omega shell-model space (the Od1s shell). We find an essentially monotonic increase in strength with increasing excitation energy. We are able to relate this behavior to a decrease in spatial symmetry (increase in SU(4) symmetry) as a function of excitation energy. (C) 1997 Elsevier Science B.V. C1 Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. RP Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA. NR 22 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 20 PY 1997 VL 414 IS 1-2 BP 7 EP 12 DI 10.1016/S0370-2693(97)01144-1 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM658 UT WOS:000071086800002 ER PT J AU Carena, M Choudhury, D Raychaudhuri, S Wagner, CEM AF Carena, M Choudhury, D Raychaudhuri, S Wagner, CEM TI Supersymmetry and charged current events at HERA SO PHYSICS LETTERS B LA English DT Article ID R-PARITY BREAKING; SCALAR TOP; SIGNATURES; B->S-GAMMA; DECAYS; STOP AB A light stop, with an R-parity-violating coupling lambda'(131), has been suggested as an explanation of the excess in high-Q(2) neutral current events observed at the HERA collider, We show that in this scheme a corresponding excess in charged current events - such as that reported by the H1 Collaboration - can appear naturally, without calling-for the presence of light sleptons or additional R-parity-violating couplings, if there exists a chargino lighter than the stop. The predicted event shapes agree well with the data. The relevant region of parameter space is identified, taking into account constraints coming from precision electroweak measurements, atomic parity violation and recent searches for first-generation leptoquarks at the Tevatron collider. (C) 1997 Elsevier Science B.V. C1 CERN, Div Theory, CH-1211 Geneva 23, Switzerland. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP CERN, Div Theory, CH-1211 Geneva 23, Switzerland. EM mcarena@fnal.gov; debchou@mail.cern.ch; sreerup@mail.cern.ch; cwagner@mail.cern.ch NR 60 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 20 PY 1997 VL 414 IS 1-2 BP 92 EP 103 DI 10.1016/S0370-2693(97)01162-3 PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM658 UT WOS:000071086800014 ER PT J AU Goity, JL AF Goity, JL TI N-c limit of spin-flavor breaking in excited baryon levels SO PHYSICS LETTERS B LA English DT Article ID HYPERFINE MASS SPLITTINGS; STRONG-COUPLING THEORY; WEISBERGER SUM-RULE; QUARK-MODEL; MAGNETIC-MOMENTS; 1/N(C) EXPANSION; HEAVY-QUARK; QCD; CONFINEMENT; CHROMODYNAMICS AB Spin-flavor symmetry breaking in the levels of excited baryons are studied to leading order in the 1/N-c expansion. This breaking occurs at zeroth order. For non-strange baryons with a single quark excited, it is shown that to first order of perturbation theory the breaking is given by one I-body operator (spin-orbit), and three 2-body operators, all involving the orbital angular momentum of the excited quark. Higher-body operators can be reduced to that set of operators. As illustration. p-wave baryons are briefly discussed. (C) 1997 Elsevier Science B.V. C1 Hampton Univ, Dept Phys, Hampton, VA 23668 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Goity, JL (reprint author), Hampton Univ, Dept Phys, Hampton, VA 23668 USA. NR 33 TC 102 Z9 102 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 20 PY 1997 VL 414 IS 1-2 BP 140 EP 148 DI 10.1016/S0370-2693(97)01154-4 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM658 UT WOS:000071086800021 ER PT J AU Serimaa, R Etelaniemi, V Laitalainen, T Bienenstock, A Vahvaselka, S Paakkari, T AF Serimaa, R Etelaniemi, V Laitalainen, T Bienenstock, A Vahvaselka, S Paakkari, T TI Structure of amorphous platinum uridine green sulfate by AWAXS and EXAFS SO INORGANIC CHEMISTRY LA English DT Article ID X-RAY-SCATTERING; RADIAL-DISTRIBUTION FUNCTIONS; ANTICANCER DRUG CISPLATIN; PYRIMIDINE GREENS; CRYSTAL-STRUCTURE; ALPHA-PYRIDONE; MAJOR ADDUCT; HEAD HEAD; COMPLEXES; DNA AB Amorphous platinum uridine green sulfate was studied using anomalous wide-angle X-ray scattering and X-ray absorption techniques. Experiments were made with synchrotron radiation in the vicinity of the Pt L-III absorption edge. The experimental results agree with a mixture model where the major components are mono-and dinuclear Pt complexes. The intramolecular Pt-Pt distance of 3 Angstrom and the shortest intermolecular Pt-PI distances of 5.1 and 7.3 Angstrom were determined from the approximative regularized Pt-Pt partial, radial distribution function. The shortest average Pt-O and Pt-N distance of 2.03 Angstrom was obtained from the EXAFS data. C1 UNIV HELSINKI,DEPT CHEM,FIN-00014 HELSINKI,FINLAND. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP Serimaa, R (reprint author), UNIV HELSINKI,DEPT PHYS,POB 9,FIN-00014 HELSINKI,FINLAND. NR 55 TC 9 Z9 9 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 19 PY 1997 VL 36 IS 24 BP 5574 EP 5579 DI 10.1021/ic9611756 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA YH560 UT WOS:A1997YH56000025 ER PT J AU McNeill, K Andersen, RA Bergman, RG AF McNeill, K Andersen, RA Bergman, RG TI C-C and C-H bond activation at ruthenium(II): The stepwise degradation of a neopentyl ligand to a trimethylenemethane ligand SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Review ID BETA-METHYL-ELIMINATION; PROMOTED SULFATED ZIRCONIA; TRANSITION-METAL COMPLEXES; RAY CRYSTAL-STRUCTURE; CARBON BOND; HYDROGEN-TRANSFER; SPIRO<2.4>HEPTA-4,6-DIENE SYSTEM; METALLACYCLOBUTANE COMPLEXES; CYCLOPENTADIENYL COMPLEXES; THERMOLYTIC REARRANGEMENT AB Ruthenacyclobutane complexes (SiP3)(PMe3)Ru(CH2EMe2CH2) (SiP3 = MeSi(CH2PMe2)(3); 1, E = C; 2, E = Si) were synthesized from (SiP3)(PMe3)RuCl2 (3) and 2 equiv of the Grignard reagents, Me3ECH2MgCl. Metallacycle 1 was found to reversibly interconvert with the allyl complex (SiP3)Ru(Me)(eta(3)-CH2CMeCH2) (4) and PMe3 when heated above 75 degrees C. From the results of kinetic studies and thermolysis of labeled material, the interconversion is proposed to take place by reversible beta-methyl elimination/insertion. Conversion of 1 to 4 is an endothermic process (Delta H degrees = 14.3 +/- 1.1 kcal mol(-1)), but it is entropically favorable (Delta S degrees = 40.9 +/- 2.8 cal K-1 mol(-1)) due to the loss of the PMe3 ligand. Activation parameters for the beta-insertion were determined to be Delta H-double dagger = 26.0 +/- 1.2 kcal mol(-1) and Delta S double dagger = -10.5 +/- 0.9 cal K-1 mol(-1) Allyl complex 4 has been isolated as a mixture of isomers (7:1 endo:exo). The mechanism of interconversion of 4(endo) and 4(exo) was determined by H-1{P-31} NMR spectroscopy (EXSY) to be a process involving a stereochemically rigid, square-pyramidal eta(1)-intermediate. Thermolysis of 4 leads to loss of CH4 and the production of the trimethylenemethane complex (SiP3)Ru(eta(4)-C(CH2)(3)) (7). The solid state structures of 1 and 7 were determined by X-ray diffraction. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI McNeill, Kristopher/A-9834-2009 OI McNeill, Kristopher/0000-0002-2981-2227 NR 113 TC 60 Z9 61 U1 4 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 19 PY 1997 VL 119 IS 46 BP 11244 EP 11254 DI 10.1021/ja972131e PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA YG901 UT WOS:A1997YG90100013 ER PT J AU Messinger, J Robblee, JH Yu, WO Sauer, K Yachandra, VK Klein, MP AF Messinger, J Robblee, JH Yu, WO Sauer, K Yachandra, VK Klein, MP TI The S-0 state of the oxygen-evolving complex in photosystem II is paramagnetic: Detection of EPR multiline signal SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MANGANESE COMPLEXES; SPINACH-CHLOROPLASTS; EVOLUTION; RES; INTERMEDIATE; RESONANCE; ENZYME; WATER; IONS C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP Messinger, J (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [R01 GM055302, R56 GM055302] NR 22 TC 140 Z9 143 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 19 PY 1997 VL 119 IS 46 BP 11349 EP 11350 DI 10.1021/ja972696a PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA YG901 UT WOS:A1997YG90100038 PM 25221336 ER PT J AU DeMarini, DM Hastings, SB Brooks, LR Eischen, BT Bell, DA Watson, MA Felton, JS Sandler, R Kohlmeier, L AF DeMarini, DM Hastings, SB Brooks, LR Eischen, BT Bell, DA Watson, MA Felton, JS Sandler, R Kohlmeier, L TI Pilot study of free and conjugated urinary mutagenicity during consumption of pan-fried meats: possible modulation by cruciferous vegetables, glutathione S-transferase-M1, and N-acetyltransferase-2 SO MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS LA English DT Article DE urinary mutagenicity; diet; phenotype ID S-TRANSFERASE M1; COLON-CANCER; COLORECTAL-CANCER; BRUSSELS-SPROUTS; HETEROCYCLIC AMINES; CARCINOGEN-METABOLISM; GENETIC-POLYMORPHISM; CYTOCHROME P4501A2; AROMATIC-AMINES; RISK AB Epidemiological and experimental evidence indicates that consumption of fried meats in conjunction with certain genotypes of phase I and II metabolism genes poses an elevated risk for colorectal cancer. Parallel to this, the consumption of cruciferous vegetables is associated with a reduced risk of colon cancer. Therefore, we designed a 6-week pilot feeding study to evaluate the effect of these variables on urinary mutagenicity, which is a biomarker associated with fried-meat consumption. Eight subjects were fed fried meats daily for six weeks; four ate cruciferous vegetables, and four ate non-cruciferous vegetables, Urinary mutagenicity was evaluated in the presence of S9 in strain YG1024 of Salmonella, which is a frameshift strain that overproduces acetyltransferase. C18/methanol extracts of 24-h urines collected once each week were tested unhydrolyzed (free mutagenicity) and hydrolyzed (total mutagenicity); the difference between the two was the conjugated mutagenicity. Although not significant, the levels of conjugated urinary mutagenicity doubled among crucifera consumers and decreased to 30% of the initial levels among non-crucifera consumers, suggesting the possibility that crucifera may enhance the level of conjugated urinary mutagenicity resulting from consumption of fried meats. Such an effect would be consistent with the documented ability of cruciferous vegetables to induce phase II enzymes. The NAT2 rapid phenotype was significantly associated with similar to 2-fold increases in conjugated(p = 0.05) and total (p = 0.004) urinary mutagenicity relative to NAT2 slow subjects, consistent with the elevated risk confirmed by the NAT2 rapid phenotype for colorectal cancer among meat consumers, An similar to 2-fold increase in urinary mutagenicity among the GSTMI(-) subjects relative to the GSTM1(+) subjects approached significance for free (p = 0.18) and total (p = 0.13) urinary mutagenicity. This is the first report on (a) the mutagenicity of hydrolyzed urine, which was consistently more mutagenic than unhydrolyzed urine; (b) the potential enhancement of conjugated urinary mutagenicity by crucifera; and (c) the association of the rapid NAT2 and possibly the GSTM1(-) phenotype with elevated levels of fried meat-associated urinary mutagenicity. (C) 1997 Elsevier Science B.V. C1 UNIV N CAROLINA,DEPT NUTR,CHAPEL HILL,NC 27599. UNIV N CAROLINA,DEPT EPIDEMIOL,CHAPEL HILL,NC 27599. NIEHS,RES TRIANGLE PK,NC 27709. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. UNIV N CAROLINA,SCH MED,CHAPEL HILL,NC 27599. RP DeMarini, DM (reprint author), US EPA,DIV ENVIRONM CARCINOGENESIS,RES TRIANGLE PK,NC 27711, USA. NR 78 TC 25 Z9 25 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0027-5107 J9 MUTAT RES-FUND MOL M JI Mutat. Res.-Fundam. Mol. Mech. Mutagen. PD NOV 19 PY 1997 VL 381 IS 1 BP 83 EP 96 DI 10.1016/S0027-5107(97)00152-8 PG 14 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology GA YH086 UT WOS:A1997YH08600010 PM 9403034 ER PT J AU Orlando, TM Kimmel, GA AF Orlando, TM Kimmel, GA TI The role of excitons and substrate temperature in low-energy (5-50 eV) electron-stimulated dissociation of amorphous D2O ice SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 7th International Workshop on Desorption Induced by Electronic Transitions (DIET-7) CY APR 08-11, 1997 CL AMBLESIDE, ENGLAND DE amorphous surfaces; electron-stimulated desorption; water ID H2O ICE; MOLECULAR-HYDROGEN; SOLID H2O; DESORPTION; WATER; YIELDS; DISTRIBUTIONS; SPECTROSCOPY; EXCITATIONS; PROTONS AB We have studied the interaction of low-energy (5-50 eV) electrons with nanoscale (similar to 10 ML) ice films by probing the yields and quantum-state distributions of the neutral dissociation products using laser resonance-enhanced multiphoton ionization spectroscopy. In particular, we have observed the electron-stimulated desorption (ESD) of D (S-2), O (P-3(2)) and O (D-1(2)) from amorphous D2O films. These products are observed at threshold energies (relative to the vacuum level) between similar to 6.5-7 eV and desorb with low kinetic energies (similar to 60-85 meV) which are independent of the incident electron energy. We associate the ESD of atomic fragments from ice with dissociation of Frenkel-type excitons of 4a(1) character which are near the bottom of the ice conduction band. These excitons are created either directly or via electron-ion recombination. Changing the surface temperature from 88 to 145 K results in an increase in the thermal component of the time-of-flight (kinetic energy) distributions and an overall increase in the neutral fragment yield. We suggest that the change in neutral yield with substrate temperature results from a combination of: (1) increased electron-ion recombination; (2) exciton transport to the near-surface region; and (3) dissociation followed by inelastic scattering and desorption. (C) 1997 Elsevier Science B.V. RP Orlando, TM (reprint author), PACIFIC NW LAB, ENVIRONM MOL SCI LAB, POB 999,MS K8-88, RICHLAND, WA 99352 USA. NR 29 TC 43 Z9 43 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 18 PY 1997 VL 390 IS 1-3 BP 79 EP 85 DI 10.1016/S0039-6028(97)00511-6 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK135 UT WOS:A1997YK13500012 ER PT J AU Simpson, WC Parenteau, L Smith, RS Sanche, L Orlando, TM AF Simpson, WC Parenteau, L Smith, RS Sanche, L Orlando, TM TI Electron-stimulated desorption of D- (H-) from condensed D2O (H2O) films SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 7th International Workshop on Desorption Induced by Electronic Transitions (DIET-7) CY APR 08-11, 1997 CL AMBLESIDE, ENGLAND DE amorphous thin films; desorption induced by electronic transitions (DIET); electron-stimulated desorption (ESD); polycrystalline thin films; water ID AMORPHOUS WATER ICE; MOLECULAR-HYDROGEN; ATTACHMENT; ENERGY; RESONANCES; SURFACES; YIELDS; SCATTERING; DEPENDENCE; SOLIDS AB The electron-stimulated desorption (ESD) of D- and H- ions from condensed D2O and H2O films is investigated. Three low-energy peaks are observed in the ESD anion yield, which are identified as arising from excitation of B-2(1), (2)A(1) and B-2(2) dissociative electron attachment (DEA) resonances. Additional structure is observed between 18 and 32 eV, which may be due to ion pair formation or to DEA resonances involving the 2a(1) orbital. The ion yield resulting from excitation of the B-2(1) resonance increases as the film is heated. We attribute the increase in the ion yield to thermally induced hydrogen bond breaking near the surface, which enhances the lifetimes of the excited stales that lead to desorption. (C) 1997 Elsevier Science B.V. C1 PACIFIC NW NATL LAB,ENVIRONM MOL SCI LAB,RICHLAND,WA 99352. UNIV SHERBROOKE,FAC MED,CANADIAN MED RES GRP RADIAT SCI,SHERBROOKE,PQ J1H 5N4,CANADA. RI Smith, Scott/G-2310-2015 OI Smith, Scott/0000-0002-7145-1963 NR 32 TC 31 Z9 31 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 18 PY 1997 VL 390 IS 1-3 BP 86 EP 91 DI 10.1016/S0039-6028(97)00522-0 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK135 UT WOS:A1997YK13500013 ER PT J AU Sieger, MT Orlando, TM AF Sieger, MT Orlando, TM TI Effect of surface roughness on the electron-stimulated desorption of D+ from microporous D2O ice SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 7th International Workshop on Desorption Induced by Electronic Transitions (DIET-7) CY APR 08-11, 1997 CL AMBLESIDE, ENGLAND DE amorphous thin films; electron-stimulated desorption; surface structure, morphology, roughness and topography; water ID AMORPHOUS WATER ICE; VAPOR-DEPOSITED ICE; MOLECULAR-HYDROGEN; REFRACTIVE-INDEX; ENERGY; H2O; ADSORPTION; DISTRIBUTIONS; SPECTROSCOPY; PT(111) AB The electron-stimulated desorption (ESD) of D+ from microporous D2O ice films condensed on Pt(lll) has been investigated. The total D+ yield as a function of temperature from 90-180 K depends sensitively on the him roughness, surface temperature and ice phase. In particular, we observe an irreversible increase in the cation yield as the microporous thin film is heated from 90-120 K, which we associate with a decrease in surface roughness as the micropores collapse. We present evidence which suggests that the number of surface sites available for emission, the surface roughness. and reneutralization or reactive scattering of the D+ desorbate play major roles in determining the ion yield. A simple model which qualitatively addresses the role of surface roughening on ESD ion yields shows good agreement with the data. (C) 1997 Elsevier Science B.V. C1 PACIFIC NW NATL LAB,ENVIRONM MOL SCI LAB,RICHLAND,WA 99352. RI Sieger, Matthew/B-4261-2011 OI Sieger, Matthew/0000-0001-7387-3660 NR 26 TC 19 Z9 19 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 18 PY 1997 VL 390 IS 1-3 BP 92 EP 96 DI 10.1016/S0039-6028(97)00523-2 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK135 UT WOS:A1997YK13500014 ER PT J AU Jennison, DR Sullivan, JP Schultz, PA Sears, MP Stechel, EB AF Jennison, DR Sullivan, JP Schultz, PA Sears, MP Stechel, EB TI DIET in the bulk: evidence for hot electron cleavage of Si-H bonds in SiO2 films SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 7th International Workshop on Desorption Induced by Electronic Transitions (DIET-7) CY APR 08-11, 1997 CL AMBLESIDE, ENGLAND DE amorphous thin films; atomistic dynamics; density functional calculations; electron-solid interactions; electron-stimulated desorption; silicon oxides ID DANGLING BONDS; DESORPTION; SILICON; SURFACE; TRANSITIONS; ADSORBATE; DEUTERIUM; DYNAMICS; STATE; STM AB The observed increase in leakage current through SiO2 films after hot electron exposure is ascribed to dissociation induced by electronic transitions (''DIET'') of bulk Si-H bonds. producing mobile hydrogen. We use ab initio supercell bandstructure calculations at the local density functional level to locate features produced by hydrogen-containing defects in alpha-SiO2. The edge of the Si-H sigma* resonance is found to be about 2.7 eV above the conduction band rise, in good agreement with the observed threshold for hot electron induced damage in amorphous SiO2 films grown on Si substrates. The O-H sigma* resonance is almost 4 eV higher. Removing H from O-H in the supercell does not affect the gap region (-O- forms); however, removing H from Si-H produces a mid-gap state. suggesting leakage current by hopping conductivity between Si dangling bonds. A Morse potential model is used to explore the dynamics of bond scission by short-lived (<1 fs) hot electron sigma* capture. Supercell calculations on interstitial atomic hydrogen indicate the energy cost to break an embedded Si-II bond is about 0.6 eV less than in the gas phase. The DIET yield is substantially increased by reducing both ground and electron-attached state binding by this amount. While uncertainty over the displaced equilibrium in the electron-attached excited stale remains. the computed DIET cross-section for reasonable parameters is approximate to 10(-18) cm(2), and is in agreement with the semi-empirically derived value for trap creation. Comparisons are made to surface DIET processes involving Si-H bonds. (C) 1997 Elsevier Science B.V. RP SANDIA NATL LABS, POB 5800, ALBUQUERQUE, NM 87185 USA. RI Stechel, Ellen/B-1253-2012 NR 32 TC 12 Z9 12 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD NOV 18 PY 1997 VL 390 IS 1-3 BP 112 EP 118 DI 10.1016/S0039-6028(97)00527-X PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA YK135 UT WOS:A1997YK13500018 ER PT J AU Ruvimov, S LilientalWeber, Z Washburn, J Drummond, TJ Hafich, M Lee, SR AF Ruvimov, S LilientalWeber, Z Washburn, J Drummond, TJ Hafich, M Lee, SR TI Microstructure of GaN layers grown on (001) GaAs by plasma assisted molecular-beam epitaxy SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSMISSION ELECTRON-MICROSCOPE; CUBIC GAN; GALLIUM NITRIDE; PHASE; FILMS; MBE; ZINCBLENDE AB High resolution electron microscopy has been applied to characterize the structure of beta-GaN epilayers grown on (001) GaAs substrates by plasma-assisted molecular-beam epitaxy. An rf plasma source was used to promote chemically active nitrogen. An exposure of the layer surface to the As flux during the growth of the first few monolayers was shown to result in remarkably flat GaN-GaAs interface. The best quality GaN layers were achieved by near-stoichiometric nucleation with optimal Ga-to-N ratio. Deviation from these nucleation conditions leads to interface roughening and formation of the wurtzite phase within the GaN layer. All the layers contained a high density of stacking faults near the interface which sharply decreases toward the surface. Stacking faults were anisotropically distributed within the GaN layer probably due to different properties of alpha compared to beta dislocations in cubic GaN. The majority of stacking faults intersect the interface along lines parallel to the major flat of the GaAs wafer. The stacking faults are often associated with atomic steps at the GaN-GaAs interface. (C) 1997 American Institute of Physics. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP Ruvimov, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 23 TC 25 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 17 PY 1997 VL 71 IS 20 BP 2931 EP 2933 DI 10.1063/1.120219 PG 3 WC Physics, Applied SC Physics GA YF675 UT WOS:A1997YF67500021 ER PT J AU Durston, PJ Schmidt, J Palmer, RE Wilcoxon, JP AF Durston, PJ Schmidt, J Palmer, RE Wilcoxon, JP TI Scanning tunneling microscopy of ordered coated cluster layers on graphite SO APPLIED PHYSICS LETTERS LA English DT Article ID ASSEMBLED MOLECULAR NANOSTRUCTURE; ROOM-TEMPERATURE; SIZE SEGREGATION; NANOCRYSTALLITES; COLLOIDS; SHAKING AB Surfactant stabilized gold clusters have been deposited on graphite and studied with scanning tunneling microscopy in vacuum. Cluster layers with a superlattice constant of approximate to 31 Angstrom were found, extending over several micrometers. The clusters form a hexagonal lattice which is ordered over distances of about Angstrom. At low samples biases (<0.75 V) the clusters are not imaged, consistent with a Coulomb blockade effect. (C) 1997 American Institute of Physics. C1 UNIV BIRMINGHAM,SCH PHYS & ASTRON,NANOSCALE PHYS RES LAB,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. SANDIA NATL LABS,NANOSTRUCT & ADV MAT DEPT 1152,ALBUQUERQUE,NM 87185. RI Palmer, Richard/A-5366-2008 OI Palmer, Richard/0000-0001-8728-8083 NR 18 TC 45 Z9 45 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 17 PY 1997 VL 71 IS 20 BP 2940 EP 2942 DI 10.1063/1.120222 PG 3 WC Physics, Applied SC Physics GA YF675 UT WOS:A1997YF67500024 ER PT J AU Iglesia, E Barton, DG Biscardi, JA Gines, MJL Soled, SL AF Iglesia, E Barton, DG Biscardi, JA Gines, MJL Soled, SL TI Bifunctional pathways in catalysis by solid acids and bases SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT International Symposium on Acid-Base Catalysis III CY APR 20-24, 1997 CL ROLDUC, NETHERLANDS DE bifunctional pathway, concerted; solid acid; adatom migration ID TUNGSTEN CARBIDES; LOW-TEMPERATURE; REACTION-MECHANISM; PROBE MOLECULES; MAGNESIUM-OXIDE; CARBON-MONOXIDE; SURFACE OXYGEN; HYDROGEN; ZEOLITES; ALKANES AB Chemical reactions catalyzed by solid acids and bases often require that reactants, intermediates, or activated complexes interact with several surface functions. Concerted and sequential bifunctional pathways also occur in homogeneous and enzyme catalysis. Hydrogenation and dehydration reactions require acid-base site pairs of intermediate strength, because such sites can form, stabilize, and discard adsorbed intermediates during a catalytic turnover. Deuterium exchange and H-H dissociation reactions also occur on acid-base pairs present in single-component or binary oxides and in supported oxide clusters. Hydrogenation of aromatic acids, dehydration of alkanols and methanolamine, condensation of alcohols, and deuterium exchange provide specific examples of bifunctional acid-base catalysis. Dehydration and dehydrogenation reactions of alkanols, widely used as probes of acid or base sites, probe instead the density and chemical properties of acid-base site pairs. Concerted bifunctional pathways require that sites co-exist within molecular distances. On surfaces, the inappropriate location of these sites can prevent concerted interactions, but rapid transfer of intermediates via surface or gas phase diffusion leads to kinetic coupling between distant sites and to sequential bifunctional pathways. These bifunctional sequences overcome proximity requirements by equilibration of adsorbed species throughout surface regions containing several types of sites. Diffusion of alkenes in the gas phase couples dehydrogenation and acid sites during n-alkane isomerization on bifunctional tungsten carbides modified by chemisorbed oxygen. These bifunctional surfaces form Bronsted acid sites by surface migration of H adatoms from WC to WOx sites. Acid (or base) sites and H-2 dissociation sites on surfaces interact via surface diffusion of H adatoms. This leads to bifunctional alkane and alkanol reactions via kinetic coupling of C-H or O-H bond activation and hydrogen adsorption-desorption steps. Propane dehydrogenation on H-ZSM5 modified by exchanged cations, n-heptane isomerization on ZrO2 doped with WOx and Pt, and alcohol condensation on Cu-promoted Mg5CeOx oxides illustrate the role of kinetic coupling mediated by migration of hydrogen adatoms. In each example, metal clusters or isolated cations increase the rate of acid or base catalysis by providing a 'porthole' for hydrogen adsorption and desorption. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. EXXON RES & ENGN CO, CORP RES LAB, ANNANDALE, NJ 08801 USA. RP UNIV CALIF BERKELEY, DEPT CHEM ENGN, EO LAWRENCE BERKELEY NATL LAB, BERKELEY, CA 94720 USA. RI Barton, David/B-8601-2013; Iglesia, Enrique/D-9551-2017 OI Barton, David/0000-0002-4518-6609; Iglesia, Enrique/0000-0003-4109-1001 NR 98 TC 151 Z9 152 U1 6 U2 94 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 EI 1873-4308 J9 CATAL TODAY JI Catal. Today PD NOV 17 PY 1997 VL 38 IS 3 BP 339 EP 360 DI 10.1016/S0920-5861(97)81503-7 PG 22 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA YK040 UT WOS:A1997YK04000005 ER PT J AU Jager, HI Cardwell, HE Sale, MJ Bevelhimer, MS Coutant, CC VanWinkle, W AF Jager, HI Cardwell, HE Sale, MJ Bevelhimer, MS Coutant, CC VanWinkle, W TI Modelling the linkages between flow management and salmon recruitment in rivers SO ECOLOGICAL MODELLING LA English DT Article DE Oncorhynchus tshawytscha; Chinook salmon; individual-based model; spatially explicit model; instream flow ID INDIVIDUAL-BASED MODEL; JUVENILE SALMONIDS; POPULATION; STREAMS; SIZE; SENSITIVITY; INCUBATION AB We developed a simulation model to predict instream flow effects on smelt production for fall chinook salmon (Oncorhynchus tshawytscha) in regulated rivers. The principal purpose of this model is to serve as a management tool to evaluate effects on salmon of instream releases from upstream reservoirs. The dramatic decline in chinook salmon in California rivers suggests a need for such a tool. We developed an individual-based and spatially explicit model to simulate the influences of riverine habitat on each lifestage leading to successful outmigration of chinook salmon. Model predictions of development, growth and survival showed good agreement with four years of field data collected on the Tuolumne River, California. Our analysis of parameter sensitivities identified flow-related redd mortality and temperature-related juvenile mortality as limitations on smelt production. (C) 1997 Elsevier Science B.V. RP Jager, HI (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,MAIL STOP 6036,OAK RIDGE,TN 37831, USA. OI Jager, Henriette/0000-0003-4253-533X NR 46 TC 35 Z9 37 U1 3 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD NOV 17 PY 1997 VL 103 IS 2-3 BP 171 EP 191 DI 10.1016/S0304-3800(97)00084-7 PG 21 WC Ecology SC Environmental Sciences & Ecology GA YJ453 UT WOS:A1997YJ45300006 ER PT J AU Loehle, C AF Loehle, C TI The pathogen transmission avoidance theory of sexual selection SO ECOLOGICAL MODELLING LA English DT Article DE showy males; fitness; heritability; good-genes model; sexual dimorphism ID BRIGHT MALE PLUMAGE; MATE CHOICE; FEMALE CHOICE; MATING PREFERENCES; BLOOD PARASITES; EVOLUTION; BIRDS; POPULATIONS; ORNAMENT; INFECTION AB The current theory that sexual selection results from female preference for males with good genes suffers from several problems. An alternative explanation, the pathogen transmission avoidance hypothesis, argues that the primary function of showy traits is to provide a reliable signal of current disease status, so that sick individuals can be avoided during mating. This study shows that a significant risk of pathogen transmission occurs during mating and that showy traits are reliable indicators of current disease status. A simulation model of population dynamics linked with pathogen transmission indicates that female choosiness traits are selectively advantageous and spread through the population but because the selective benefit of choosiness depends on the percentage of choosy females and bright males, as sexual selection proceeds the selection pressure is reduced and the process becomes self-limiting rather than runaway. Thus, an epidemic model approach leads to very different conclusions than a constant selection-coefficient population genetic approach. The origin of female choosiness is argued to lie in a general tendency to avoid sick individuals, even in the absence of showy traits, which originate as exaggerations of normal traits that are indicative of good health (bright feathers, vigorous movement, large size). Thus, in this new model the origins of both showy traits and female choosiness are not problematic and there is no threshold effect. This model predicts that when the possession of male showy traits does not help to reduce disease in the female, showy traits are unlikely to occur. This case corresponds to thorough exposure of every animal to all group pathogens, on average, in large groups. Such species are shown with a large data set on birds to be less likely to exhibit showy traits. The good-genes model does not make this prediction. The pathogen transmission avoidance model can also lead to the evolution of showy traits even when selection is not effective against a given pathogen (e.g. when there is no heritable variation for resistance), but can result in selection for resistance if such genes are present. Monogamy is argued to reduce selection pressures for showy traits; data show monogamous species to be both less parasitized and less showy. Overall, the pathogen transmission avoidance hypothesis provides a complete alternative to the good-genes theory and makes new predictions. (C) 1997 Elsevier Science B.V. RP Loehle, C (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 61 TC 40 Z9 41 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD NOV 17 PY 1997 VL 103 IS 2-3 BP 231 EP 250 DI 10.1016/S0304-3800(97)00106-3 PG 20 WC Ecology SC Environmental Sciences & Ecology GA YJ453 UT WOS:A1997YJ45300009 ER PT J AU Londono, JD Annis, BK Habenschuss, A Borodin, O Smith, GD Turner, JZ Soper, AK AF Londono, JD Annis, BK Habenschuss, A Borodin, O Smith, GD Turner, JZ Soper, AK TI Cation environment in molten lithium iodide doped poly(ethylene oxide) SO MACROMOLECULES LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; PAIR CORRELATION-FUNCTIONS; POLYMER ELECTROLYTES; NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; COMPLEXES; TEMPERATURE; CONFORMATIONS; ASSOCIATION; DEPENDENCE AB We present neutron diffraction isotopic substitution (NDIS) and molecular dynamics (MD) simulation results on molten poly(ethylene oxide) doped with LiI in a molar ratio of five ether oxygens per Li+ ion. The NDIS and the MD studies yield estimates of the par tial radial distribution function about the Li+ ion. Using a quantum chemistry based atomistic force field, excellent agreement between simulation and experiment is obtained. The agreement between NDIS and MD is improved significantly if ion/ion and ion/polymer polarization effects are introduced in the simulations, indicating the importance of polarization effects in this system. Results indicate a strong coordination between the Li+ cations and the ether oxygen atoms. The simulation results suggest a value of n(0)(r < 3 Angstrom) similar or equal to 3.5 for the coordination number of oxygens about Li+. The variation of n(0) with Li-O separation to 2.5 Angstrom is similar from simulation and experiment, although experimentally beyond 2.5 Angstrom this function is impossible to determine. C1 UNIV MISSOURI,DEPT CHEM ENGN,COLUMBIA,MO 65211. UNIV LONDON BIRKBECK COLL,DEPT CRYSTALLOG,LONDON WC1E 7HX,ENGLAND. RUTHERFORD APPLETON LAB,ISIS SCI DIV,DIDCOT OX11 0QX,OXON,ENGLAND. RP Londono, JD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. RI Borodin, Oleg/B-6855-2012 OI Borodin, Oleg/0000-0002-9428-5291 NR 42 TC 55 Z9 55 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 17 PY 1997 VL 30 IS 23 BP 7151 EP 7157 DI 10.1021/ma9705681 PG 7 WC Polymer Science SC Polymer Science GA YH247 UT WOS:A1997YH24700018 ER PT J AU Wen, JM Somorjai, G Lim, F Ward, R AF Wen, JM Somorjai, G Lim, F Ward, R TI XPS study of surface composition of a segmented polyurethane block copolymer modified by PDMS end groups and its blends with phenoxy SO MACROMOLECULES LA English DT Article ID DIBLOCK COPOLYMERS; INTERFACIAL-TENSION; POLY(DIMETHYLSILOXANE) AB Quantitative angle-resolved X-ray photoelectron spectroscopy (XPS) was used to investigate surface modification of a newly developed biomaterial, segmented polyurethane capped with poly-(dimethylsiloxane) (PDMS) end groups, and its blends with phenoxy. The composition of the freshly prepared films are not in equilibrium but they can be equilibrated both in air and in water. The surface segregation of PDMS is found both in nonequilibrium and in equilibrium states, XPS data also indicate that the PDMS is enriched in the film surfaces of both air/polymer and glass substrate/polymer interfaces for the pure segmented polyurethane and its blends. The surface composition is affected by annealing temperature and water. Below the polymer glass transition temperature, there is a small increase in PDMS surface concentration during annealing. Above Tg, PDMS surface concentration can increase by a factor of 2. The presence of water will decrease the PDMS surface segregation at temperatures both below and above Tg. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. POLYMER TECHNOL GRP INC,EMERYVILLE,CA 94608. NR 18 TC 41 Z9 42 U1 0 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 17 PY 1997 VL 30 IS 23 BP 7206 EP 7213 DI 10.1021/ma961442r PG 8 WC Polymer Science SC Polymer Science GA YH247 UT WOS:A1997YH24700026 ER PT J AU Henning, W AF Henning, W TI Nuclear structure and reactions with stored nuclei SO NUCLEAR PHYSICS A LA English DT Article ID ISOTOPES AB The use of ion-storage rings is discussed for studies of nuclear reactions and structure, with emphasis on energetic beams of short-lived, radioactive nuclei. Aspects of internal versus external luminosity are considered as well as other issues connected with the inverse kinematics of reactions induced by a circulating beam of complex nuclei. Some of the physics motivation that is driving studies with radioactive beams is described. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Henning, W (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 17 PY 1997 VL 626 IS 1-2 SI SI BP 225C EP 234C PG 10 WC Physics, Nuclear SC Physics GA YM176 UT WOS:000071037400026 ER PT J AU Viola, VE Hsi, WC Kwiatkowski, K Wang, G Bracken, DS Breuer, H Brzychczyk, J Chu, YY Cornell, E Foxford, ER Gimeno-Nogues, F Ginger, D Gushue, S Huang, MJ Korteling, RG Legrain, R Lynch, WG Morley, KB Pollacco, EC Ramakrishnan, E Remsberg, LP Rowland, D Tsang, MB Volant, C Xi, H Yennello, SJ Yoder, NR AF Viola, VE Hsi, WC Kwiatkowski, K Wang, G Bracken, DS Breuer, H Brzychczyk, J Chu, YY Cornell, E Foxford, ER Gimeno-Nogues, F Ginger, D Gushue, S Huang, MJ Korteling, RG Legrain, R Lynch, WG Morley, KB Pollacco, EC Ramakrishnan, E Remsberg, LP Rowland, D Tsang, MB Volant, C Xi, H Yennello, SJ Yoder, NR TI Probing the nuclear EOS with GeV light-ion beams SO NUCLEAR PHYSICS A LA English DT Article ID HIGH-ENERGY; HOT NUCLEI; COLLISIONS; PROTONS; 4-PI AB The first 4 pi studies of identified light-charged-particles and IMFs emitted in the p, pi(-) + Au-197 reactions above 5 GeV/c are reported. Multiplicity and angular distributions show little sensitivity to either bombarding energy or projectile type. Excitation energy distributions obtained from data for the 4.8 GeV He-3 + Au-197 reaction yield values up to E* less than or similar to 1500 MeV and E*/A(residue) less than or similar to 10 MeV/nucleon. Analysis of large-angle, IMF-IMF correlations for this same system suggests that multifragmentation is a fast, time-dependent process. C1 Indiana Univ, Bloomington, IN 47405 USA. Univ Maryland, College Pk, MD 20742 USA. Jagiellonian Univ, Krakow, Poland. Brookhaven Natl Lab, Upton, NY 11973 USA. Texas A&M Univ, College Stn, TX USA. Michigan State Univ, E Lansing, MI 48824 USA. Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada. CEA Saclay, F-91191 Gif Sur Yvette, France. RP Viola, VE (reprint author), Indiana Univ, Bloomington, IN 47405 USA. RI Ginger, David/C-4866-2011; Lynch, William/I-1447-2013; Rowland, Douglas/F-3104-2014; Yennello, Sherry/B-5803-2015 OI Ginger, David/0000-0002-9759-5447; Lynch, William/0000-0003-4503-176X; Rowland, Douglas/0000-0001-8059-6905; Yennello, Sherry/0000-0003-3963-5217 NR 28 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 17 PY 1997 VL 626 IS 1-2 SI SI BP 287C EP 294C PG 8 WC Physics, Nuclear SC Physics GA YM176 UT WOS:000071037400036 ER PT J AU Beiersdorfer, P Elliott, SR Lopez-Urrutia, JC Widmann, K AF Beiersdorfer, P Elliott, SR Lopez-Urrutia, JC Widmann, K TI Measurements of nuclear parameters of high-Z isotopes performed on a high-energy electron beam ion trap SO NUCLEAR PHYSICS A LA English DT Article ID HYPERFINE-STRUCTURE; RADIOACTIVE ISOTOPES; LASER SPECTROSCOPY; HYDROGENLIKE ATOMS; CHARGE RADII; SPECTROMETER; TEMPERATURE; HO-165; SHIFT AB Spectral measurements of highly charged ions have been performed on the Livermore high-energy electron beam ion trap (EBIT) for determining various nuclear parameters. A value of mu = 4.1267 mu(N) was inferred for the nuclear magnetic moment from a measurement of the hyperfine transition of Ho-165(66+) in the visible. Values of delta[r(2)](233,238) = -0.432 fm(2) and delta[r(2)](235,238) = -0.250 fm(2) were determined for the isotopic variation of the nuclear charge radius from the energy shift of L-shell transitions in U-233(q+) and U-235(q+) relative to the x-ray line emission from U-238(q+) ions, with q = 86, 87, 88, 89. The accuracy of these measurements equals or exceeds that of earlier measurements relying on different techniques, because the atomic structure of highly charged ions is greatly simplified compared to that of neutral or few-times charged ions. The measurements can be extended to a variety of isotopes from hydrogen to transuranic elements. The latter was demonstrated in the first production of highly charged Cf-249 ions in the trap. C1 Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Sci, Livermore, CA 94550 USA. Univ Washington, Dept Phys, Seattle, WA 98195 USA. RP Beiersdorfer, P (reprint author), Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Sci, Livermore, CA 94550 USA. RI Crespo Lopez-Urrutia, Jose R./F-7069-2011 OI Crespo Lopez-Urrutia, Jose R./0000-0002-2937-8037 NR 31 TC 7 Z9 7 U1 1 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 NOV 17 PY 1997 VL 626 IS 1-2 SI SI BP 357C EP 364C PG 8 WC Physics, Nuclear SC Physics GA YM176 UT WOS:000071037400045 ER PT J AU Meier, HJ Egelhof, P Henning, W von Kienlin, A Kraus, G Weinbach, A AF Meier, HJ Egelhof, P Henning, W von Kienlin, A Kraus, G Weinbach, A TI Low temperature bolometers for experiments with cooled heavy ion beams from storage rings SO NUCLEAR PHYSICS A LA English DT Article AB The development of calorimetric low temperature detectors for the energy sensitive detection of heavy ions is discussed. Due to its high intrinsic energy resolution this detector type promises to be a useful tool for nuclear physics experiments with cooled heavy ion beams from storage rings. Detector tests performed with relativistic heavy ions from the SIS synchrotron at GSI yielded relative energy resolutions of 2-4 . 10(-3) for Ne-20 and for Bi-209 ions, limited in this case by the energy spread of the beam. In a first application of such detectors the excitation of the giant resonance in lead nuclei via the reaction Pb-nat (Ne-20, Ne-20') Pb-nat* was investigated by separating inelastically from elastically scattered Ne-20 ions in the energy spectrum. At a scattering angle of Theta(Lab) = 3 degrees the excitation energy and the strength of the giant resonance were found to be in good agreement with theoretical predictions. In a recent experiment calorimetric detectors were bombarded with cooled U-238 ions at E = 360 MeV/u, extracted from the storage ring ESR. An energy resolution of Delta E = 97 MeV, corresponding to a relative resolution of Delta E/E = 1.1 . 10(-3), was obtained. C1 Gesell Schwerionenforsch, D-64291 Darmstadt, Germany. Argonne Natl Lab, Argonne, IL 60431 USA. RP Meier, HJ (reprint author), Gesell Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany. EM egelhof@vscn.gsi.de; henning@anlphy.phy.anl.gov NR 6 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 17 PY 1997 VL 626 IS 1-2 SI SI BP 451C EP 456C PG 6 WC Physics, Nuclear SC Physics GA YM176 UT WOS:000071037400056 ER PT J AU Veil, JA AF Veil, JA TI Offsite oil field waste disposal varies across US SO OIL & GAS JOURNAL LA English DT Article RP Veil, JA (reprint author), ARGONNE NATL LAB,WATER POLICY PROGRAM,WASHINGTON,DC, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0030-1388 J9 OIL GAS J JI Oil Gas J. PD NOV 17 PY 1997 VL 95 IS 46 BP 79 EP 85 PG 7 WC Energy & Fuels; Engineering, Petroleum SC Energy & Fuels; Engineering GA YG733 UT WOS:A1997YG73300028 ER PT J AU Khare, A Habib, S Saxena, A AF Khare, A Habib, S Saxena, A TI Exact thermodynamics of the double sinh-Gordon theory in 1+1 dimensions SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRUCTURAL PHASE-TRANSITIONS; STATISTICAL-MECHANICS; MODEL; SOLITONS; KINKS AB We study the classical thermodynamics of a (1 + 1)-dimensional double-well sinh-Gordon theory. Remarkably, the Schrodinger-like equation resulting from the transfer integral method is quasi-exactly solvable at several temperatures. This allows exact calculation of the partition function and some correlation functions above and below the short-range order (''kink'') transition, in striking agreement with high resolution Langevin simulations. Interesting connections with the Landau-Ginzburg and double sine-Gordon models are also established. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP Khare, A (reprint author), INST PHYS,BHUBANESWAR 751005,ORISSA,INDIA. NR 16 TC 29 Z9 29 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3797 EP 3801 DI 10.1103/PhysRevLett.79.3797 PG 5 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600001 ER PT J AU Worah, MP AF Worah, MP TI Supersymmetric baryogenesis and flavor physics SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTROWEAK BARYOGENESIS; LIGHT STOP; MODELS AB We study the flavor physics implications of baryogenesis in the minimal supersymmetric standard model (MSSM). Enhanced B-(B) over bar mixing and b --> s gamma rates are generic to all scenarios. Depending on the origin of the CP violating phase responsible for baryogenesis there could be a large neutron electric dipole moment, large CP violating D-(D) over bar mixing, or CP violation in top quark production. We discuss how the combination of these measurements with the requirement of baryogenesis shed light on the MSSM parameter space and the source of CP violation. RP Worah, MP (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 25 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3810 EP 3813 DI 10.1103/PhysRevLett.79.3810 PG 4 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600004 ER PT J AU Anderson, S Kubota, Y Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Homoelle, D Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Ford, WT Park, H Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A ValantSpaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N AF Anderson, S Kubota, Y Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Homoelle, D Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Ford, WT Park, H Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A ValantSpaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N TI Study of the decay tau(-)->2 pi(-)pi(+)3 pi(0)nu(tau) SO PHYSICAL REVIEW LETTERS LA English DT Article ID MONTE-CARLO; PHYSICS; LIBRARY; TAUOLA AB The decay tau(-) --> 2 pi(-)pi(+)3 pi(0) nu(tau) has been studied with the CLEO II detector at the Cornell Electron Storage Ring. The branching fraction is measured to be (2.85 +/- 0.56 +/- 0.51) x 10(-4). The result is in good agreement with the isospin expectation but somewhat below the conserved-vector-current prediction. We have searched for resonance substructure in the decay. Within the statistical precision, the decay is saturated by the channels tau(-) --> pi(-)2 pi(0) omega nu(tau), 2 pi(-)pi(+)eta nu(tau), and pi(-)2 pi(0) eta nu(tau). This is the first observation of this omega decay mode and the branching fraction is measured to be (1.89(-0.67)(+0.74) +/- 0.40) x 10(-4). C1 SUNY ALBANY, ALBANY, NY 12222 USA. OHIO STATE UNIV, COLUMBUS, OH 43210 USA. UNIV OKLAHOMA, NORMAN, OK 73019 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. SO METHODIST UNIV, DALLAS, TX 75275 USA. SYRACUSE UNIV, SYRACUSE, NY 13244 USA. VANDERBILT UNIV, NASHVILLE, TN 37235 USA. VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. WAYNE STATE UNIV, DETROIT, MI 48202 USA. CALTECH, PASADENA, CA 91125 USA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV CALIF SANTA BARBARA, SANTA BARBARA, CA 93106 USA. UNIV COLORADO, BOULDER, CO 80309 USA. CORNELL UNIV, ITHACA, NY 14853 USA. UNIV FLORIDA, GAINESVILLE, FL 32611 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV HAWAII MANOA, HONOLULU, HI 96822 USA. UNIV ILLINOIS, CHAMPAIGN, IL 61801 USA. CARLETON UNIV, OTTAWA, ON K1S 5B6, CANADA. INST PARTICLE PHYS, MONTREAL, PQ, CANADA. MCGILL UNIV, MONTREAL, PQ H3A 2T8, CANADA. ITHACA COLL, ITHACA, NY 14850 USA. UNIV KANSAS, LAWRENCE, KS 66045 USA. RP UNIV MINNESOTA, MINNEAPOLIS, MN 55455 USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 15 TC 8 Z9 8 U1 1 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3814 EP 3818 DI 10.1103/PhysRevLett.79.3814 PG 5 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600005 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolla, G Bolognesi, V Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, L Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Sono, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolla, G Bolognesi, V Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, L Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Sono, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S TI Search for new particles decaying into b(b)over-bar and produced in association with W bosons decaying into e nu or mu nu at the Fermilab Tevatron SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOP-QUARK PRODUCTION; COLLIDER DETECTOR; COLLISIONS; QCD AB We search for new particles that decay into b(b)over-bar and are produced with W bosons in p(p)over-bar collisions at root s = 1.8 TeV. The search uses 109 +/- 7 pb(-1) accumulated by the CDF experiment at Fermilab. We select events with an e nu or mu nu, and two jets, one of them b tagged. The number of events and the two-jet mass distribution are consistent with expectations. Using W + Higgs production as a model for the acceptance, we set an upper limit on the production cross section times branching ratio for the new particle ranging from 14 to 19 pb (95% C.L.) as the particle mass varies from 70 to 120 GeV/c(2). C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40127 BOLOGNA,ITALY. BRANDEIS UNIV,WALTHAM,MA 02264. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60638. DUKE UNIV,DURHAM,NC 28708. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV FLORIDA,GAINESVILLE,FL 33611. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. HARVARD UNIV,CAMBRIDGE,MA 02138. HIROSHIMA UNIV,HIGASHIHIROSHIMA 724,JAPAN. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ H3A 2T8,CANADA. UNIV TORONTO,TORONTO,ON M5S 1A7,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV KARLSRUHE,INST EXPT KERNPHYS,D-76128 KARLSRUHE,GERMANY. ERNEST ORLANDO LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87132. OHIO STATE UNIV,COLUMBUS,OH 43320. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PADUA,IST NAZL FIS NUCL,I-36132 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV PITTSBURGH,PITTSBURGH,PA 15270. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14628. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. ACAD SINICA,TAIPEI 11530,TAIWAN. TEXAS A&M UNIV,COLLEGE STN,TX 77843. TEXAS TECH UNIV,LUBBOCK,TX 79409. UNIV TSUKUBA,TSUKUBA,IBARAKI 315,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53806. YALE UNIV,NEW HAVEN,CT 06511. RP Abe, F (reprint author), KEK NAT LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 315,JAPAN. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014; Introzzi, Gianluca/K-2497-2015 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787; Introzzi, Gianluca/0000-0002-1314-2580 NR 14 TC 26 Z9 26 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3819 EP 3824 DI 10.1103/PhysRevLett.79.3819 PG 6 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600006 ER PT J AU Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Prell, S Sivertz, M Sharma, V Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Fulton, R Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S AF Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Prell, S Sivertz, M Sharma, V Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Fulton, R Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S TI Limit on the two-photon production of the glueball candidate f(J)(2220) at the Cornell electron storage ring SO PHYSICAL REVIEW LETTERS LA English DT Article ID J/PSI RADIATIVE DECAYS; STATE AB We use the CLEO detector at the Cornell e(+)e(-) storage ring, CESR, to search for the two-photon production of the glueball candidate f(J)(2220) in its decay to KsKs. We present a restrictive upper limit on the product of the two-photon partial width and the KsKs branching fraction, (Gamma(gamma gamma)B(KsKs))(fJ(2220)). We use this limit to calculate a lower limit on the stickiness, which is a measure of the two-gluon coupling relative to the two-photon coupling. This limit on stickiness indicates that the f(J)(2220) has substantial glueball content. C1 WAYNE STATE UNIV, DETROIT, MI 48202 USA. CALTECH, PASADENA, CA 91125 USA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV CALIF SANTA BARBARA, SANTA BARBARA, CA 93106 USA. UNIV COLORADO, BOULDER, CO 80309 USA. CORNELL UNIV, ITHACA, NY 14853 USA. UNIV FLORIDA, GAINESVILLE, FL 32611 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV HAWAII, HONOLULU, HI 96822 USA. UNIV ILLINOIS, CHAMPAIGN, IL 61801 USA. CARLETON UNIV, OTTAWA, ON K1S 5B6, CANADA. INST PARTICLE PHYS, MONTREAL, PQ, CANADA. MCGILL UNIV, MONTREAL, PQ, CANADA. ITHACA COLL, ITHACA, NY 14850 USA. UNIV KANSAS, LAWRENCE, KS 66045 USA. UNIV MINNESOTA, MINNEAPOLIS, MN 55455 USA. SUNY ALBANY, ALBANY, NY 12222 USA. OHIO STATE UNIV, COLUMBUS, OH 43210 USA. UNIV OKLAHOMA, NORMAN, OK 73019 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. SO METHODIST UNIV, DALLAS, TX 75275 USA. SYRACUSE UNIV, SYRACUSE, NY 13244 USA. VANDERBILT UNIV, NASHVILLE, TN 37235 USA. RP VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. RI Schaffner, Stephen/D-1189-2011; Briere, Roy/N-7819-2014; Frasconi, Franco/K-1068-2016; OI Briere, Roy/0000-0001-5229-1039; Frasconi, Franco/0000-0003-4204-6587; Bean, Alice/0000-0001-5967-8674 NR 17 TC 27 Z9 27 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3829 EP 3833 DI 10.1103/PhysRevLett.79.3829 PG 5 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600008 ER PT J AU Ishida, S Fujita, T Akasaka, H Akino, N Annou, K Aoyagi, T Arai, T Arakawa, K Asakura, N Azumi, M Budny, R Chiba, S DaCosta, O Ebisawa, N Fujii, T Fukuda, T Funahashi, A Grisham, L Gunji, S Hamamatsu, K Hasegawa, Y Hatae, T Higashijima, S Hiratsuka, H Hirauchi, S Hirayama, T Honda, A Honda, M Hosogane, N Ichige, H Ide, S Ikeda, Y Isaka, M Isayama, A Isei, N Ishii, Y Isozaki, N Itami, K Itoh, T Iwahashi, T Kamada, Y Kaminaga, A Kashiwabara, T Kawai, M Kawamata, Y Kawano, Y Kazama, D Kazawa, M Kikuchi, M Kimura, H Kimura, T Kishimoto, H Kishimoto, Y Kitamura, S Kiyono, K Kodama, K Koide, Y Kokusen, S Kondoh, T Konoshima, S Koog, J Kramer, GJ Kubo, H Kurihara, K Kurita, G Kuriyama, M Kusama, Y Masaki, K Matsuda, T Matsumoto, T Matukawa, M Miura, T Miya, N Miyachi, K Miyata, H Miyo, Y Mogaki, K Mori, M Morimoto, M Morioka, S Moriyama, S Nagami, M Nagashima, A Nagashima, K Nagaya, S Naito, O Nakamura, Y Nemoto, M Neyatani, Y Nishitani, T Ogiwara, N Ohga, T Ohsawa, M Ohshima, T Oikawa, T Okabe, T Okano, J Omori, K Omori, S Omori, Y Onose, Y Oohara, H Ozeki, T Saidoh, M Saigusa, M Saito, N Sakasai, A Sakata, S Sakurai, S Sasajima, T Sato, M Scott, SD Seimiya, M Seiki, H Seki, M Shimada, M Shimizu, K Shimizu, M Shimono, M Shinozaki, S Shirai, H Shitomi, M Suganuma, K Sugie, T Sunaoshi, H Takahashi, M Takahashi, S Takeji, S Takenaga, H Takizuka, T Tamai, H Terakado, M Terakado, T Tobita, K Tokuda, S Totsuka, T Toyokawa, Y Toyoshima, N Tsuchiya, K Tsugita, T Tsukahara, Y Tuda, T Uramoto, Y Ushigusa, K Usui, K Yagyu, J Yamagiwa, M Yamamoto, M Yamamoto, T Yamashita, O Yokokura, K Yoshida, H Yoshida, M Yoshino, R AF Ishida, S Fujita, T Akasaka, H Akino, N Annou, K Aoyagi, T Arai, T Arakawa, K Asakura, N Azumi, M Budny, R Chiba, S DaCosta, O Ebisawa, N Fujii, T Fukuda, T Funahashi, A Grisham, L Gunji, S Hamamatsu, K Hasegawa, Y Hatae, T Higashijima, S Hiratsuka, H Hirauchi, S Hirayama, T Honda, A Honda, M Hosogane, N Ichige, H Ide, S Ikeda, Y Isaka, M Isayama, A Isei, N Ishii, Y Isozaki, N Itami, K Itoh, T Iwahashi, T Kamada, Y Kaminaga, A Kashiwabara, T Kawai, M Kawamata, Y Kawano, Y Kazama, D Kazawa, M Kikuchi, M Kimura, H Kimura, T Kishimoto, H Kishimoto, Y Kitamura, S Kiyono, K Kodama, K Koide, Y Kokusen, S Kondoh, T Konoshima, S Koog, J Kramer, GJ Kubo, H Kurihara, K Kurita, G Kuriyama, M Kusama, Y Masaki, K Matsuda, T Matsumoto, T Matukawa, M Miura, T Miya, N Miyachi, K Miyata, H Miyo, Y Mogaki, K Mori, M Morimoto, M Morioka, S Moriyama, S Nagami, M Nagashima, A Nagashima, K Nagaya, S Naito, O Nakamura, Y Nemoto, M Neyatani, Y Nishitani, T Ogiwara, N Ohga, T Ohsawa, M Ohshima, T Oikawa, T Okabe, T Okano, J Omori, K Omori, S Omori, Y Onose, Y Oohara, H Ozeki, T Saidoh, M Saigusa, M Saito, N Sakasai, A Sakata, S Sakurai, S Sasajima, T Sato, M Scott, SD Seimiya, M Seiki, H Seki, M Shimada, M Shimizu, K Shimizu, M Shimono, M Shinozaki, S Shirai, H Shitomi, M Suganuma, K Sugie, T Sunaoshi, H Takahashi, M Takahashi, S Takeji, S Takenaga, H Takizuka, T Tamai, H Terakado, M Terakado, T Tobita, K Tokuda, S Totsuka, T Toyokawa, Y Toyoshima, N Tsuchiya, K Tsugita, T Tsukahara, Y Tuda, T Uramoto, Y Ushigusa, K Usui, K Yagyu, J Yamagiwa, M Yamamoto, M Yamamoto, T Yamashita, O Yokokura, K Yoshida, H Yoshida, M Yoshino, R TI Achievement of high fusion performance in JT-60U reversed shear discharges SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLASMAS AB Fusion performance of reversed shear discharges with an L-mode edge has been significantly improved in a thermonuclear dominant regime with up to 2.8 MA of plasma current in the JT-60U tokamak. The core plasma energy is efficiently confined due to the existence of persistent internal transport barriers formed for both ions and electrons at a large minor radius of r/a similar to 0.7 near the boundary of the reversed shear region. In an assumed deuterium-tritium fuel, the peak fusion amplification factor defined for transient conditions involving the dW/dt term would be in excess of unity. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. KYUSHU UNIV,APPL MECH RES INST,ADV FUS RES CTR,KASUGA,FUKUOKA 816,JAPAN. RP Ishida, S (reprint author), JAPAN ATOM ENERGY RES INST,NAKA FUS RES ESTAB,NAKA,IBARAKI 31101,JAPAN. RI Kyushu, RIAM/F-4018-2015; Kikuchi, Mitsuru/O-1036-2015; U-ID, Kyushu/C-5291-2016; ISHIDA, SHINICHI/E-7046-2017 OI Kikuchi, Mitsuru/0000-0002-5485-8737; NR 15 TC 73 Z9 75 U1 4 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 NOV 17 PY 1997 VL 79 IS 20 BP 3917 EP 3921 DI 10.1103/PhysRevLett.79.3917 PG 5 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600030 ER PT J AU Floro, JA Chason, E Twesten, RD Hwang, RQ Freund, LB AF Floro, JA Chason, E Twesten, RD Hwang, RQ Freund, LB TI SiGe coherent islanding and stress relaxation in the high mobility regime SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRAINED LAYERS; GROWTH; HETEROEPITAXY; SI(001); GE AB Real-time stress measurements during Si8Ge2/Si(001) heteroepitaxy, combined with ex situ microscopy, are used to examine islanding dynamics under conditions of relatively low strain and high adatom mobility, where morphological evolution bypasses dislocation formation. We show that growth in this regime proceeds similarly to growth of Ge/Si(001) (i.e., at high strain, low temperature), but with the length scales expanded by the reduced strain. This greatly facilitates measurement of the coupled kinetics of morphological evolution and stress relaxation. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. RP Floro, JA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 18 TC 137 Z9 137 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 NOV 17 PY 1997 VL 79 IS 20 BP 3946 EP 3949 DI 10.1103/PhysRevLett.79.3946 PG 4 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600037 ER PT J AU You, H Zhang, QM AF You, H Zhang, QM TI Diffuse x-ray scattering study of lead magnesium niobate single crystals SO PHYSICAL REVIEW LETTERS LA English DT Article ID RELAXOR FERROELECTRICS; PBMG1/3NB2/3O3; TRANSITION; MAGNONIOBATE; DIFFRACTION; RELAXATION; ORDER; MODEL AB Single crystals of lead magnesium niobate, PbMg1/3Nb2/3O3, were studied with x-ray scattering measurements at temperatures between 10 and 350 K. The diffuse scattering around odd-integer Bragg reflections (H + K + L = odd) has a significant anisotropic component with ledges along (110) directions. We show that the transverse optic (ferro distortion) modes whose polarizations are along (110) directions are soft and responsible for the observed diffuse scattering. Upon cooling, these modes undergo a freezing process with q-dependent freezing temperatures. Below the lowest freezing temperature (T less than or similar to 190 K) the diffuse scattering follows 1/q(2) law, indicating an elastically distorted, static structure. C1 PENN STATE UNIV,MAT RES LAB,UNIVERSITY PK,PA 16802. RP You, H (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 22 TC 98 Z9 98 U1 1 U2 17 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3950 EP 3953 DI 10.1103/PhysRevLett.79.3950 PG 4 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600038 ER PT J AU Baer, R HeadGordon, M AF Baer, R HeadGordon, M TI Sparsity of the density matrix in Kohn-Sham density functional theory and an assessment of linear system-size scaling methods SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE CALCULATIONS; BINDING MOLECULAR-DYNAMICS; FAST MULTIPOLE METHOD; SCHRODINGER-EQUATION; WANNIER FUNCTIONS; ALGORITHM; ATOMS AB The range and sparsity of the one-electron density matrix (DM) in density functional theory is studied for large systems using the analytical properties of its Chebyshev expansion. General estimates of the range of the DM are derived, showing that the range is inversely proportional to the square root of an insulator band gap and inversely proportional to the square root of the temperature. These findings support ''principle of nearsightedness'' introduced recently by W. Kohn [Phys. Rev. Lett. 76, 3168 (1996)]. These estimates are used to study the complexity of several linear system-size scaling electronic structure algorithms which differ in their dependence on the geometric dimensionality of the system. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP Baer, R (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 35 TC 88 Z9 91 U1 2 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 17 PY 1997 VL 79 IS 20 BP 3962 EP 3965 DI 10.1103/PhysRevLett.79.3962 PG 4 WC Physics, Multidisciplinary SC Physics GA YF786 UT WOS:A1997YF78600041 ER PT J AU Lovenich, R Schafer, W Kner, P Chemla, DS AF Lovenich, R Schafer, W Kner, P Chemla, DS TI Theory of coherently driven biexcitons in strong magnetic fields SO PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT 5th International Meeting on Optics of Excitons in Confined Systems (OECS 5) CY AUG 10-14, 1997 CL GOTTINGEN, GERMANY AB A new regime at low excitation densities which is not in accordance with the semiconductor Bloch equations lias been revealed in recent experiments on fs time-resolved coherent wave mixing under high magnetic field. We present a rigorous theory of strongly correlated magneto-excitons which is based on the coherent truncation scheme. Due to the restriction of excitonic degrees of freedom by the magnetic field Coulomb correlation effects are strongly enhanced. Om numerical results for GaAs explain most of the experimental findings. Especially we can show that the slow rising time of the time-integrated four-wave mixing signals results from the non-Markovian coupling of the polarization to biexcitonic continuum states. C1 Forschungszentrum Julich, Hochstleistungsrechenzentrum, D-52425 Julich, Germany. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Lovenich, R (reprint author), Forschungszentrum Julich, Hochstleistungsrechenzentrum, Postfach 1913, D-52425 Julich, Germany. EM r.loevenich@fz-juelich.de NR 8 TC 6 Z9 6 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 1862-6300 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Mat. PD NOV 16 PY 1997 VL 164 IS 1 BP 347 EP 351 DI 10.1002/1521-396X(199711)164:1<347::AID-PSSA347>3.0.CO;2-L PG 5 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YP830 UT WOS:000071319400069 ER PT J AU Kner, P Bar-Ad, S Marquezini, MV Mukamel, S Chemla, DS AF Kner, P Bar-Ad, S Marquezini, MV Mukamel, S Chemla, DS TI Quantum confined Fano interference SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article; Proceedings Paper CT 5th International Meeting on Optics of Excitons in Confined Systems (OECS 5) CY AUG 10-14, 1997 CL GOTTINGEN, GERMANY ID RESONANCES AB We have observed the suppression of Fano resonances in epitaxial layers of GaAs in a magnetic field due to discretization of the quasi-continuum by quantum confinement. Our observations can be explained using a simple "picket fence" model in which the density of states can be adjusted to model the different thickness epitaxial layers. The suppression of the Fano resonance occurs for length scales which are unusually large for optical experiments. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Kner, P (reprint author), Univ Calif Berkeley, Dept Phys, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD NOV 16 PY 1997 VL 164 IS 1 BP 319 EP 323 DI 10.1002/1521-396X(199711)164:1<319::AID-PSSA319>3.0.CO;2-P PG 5 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YP830 UT WOS:000071319400063 ER PT J AU Mascarenhas, A Fluegel, B Zhang, Y Geisz, JF Olson, JM AF Mascarenhas, A Fluegel, B Zhang, Y Geisz, JF Olson, JM TI Carrier relaxation and exciton bleaching in spontaneously ordered GaInP SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article; Proceedings Paper CT 5th International Meeting on Optics of Excitons in Confined Systems (OECS 5) CY AUG 10-14, 1997 CL GOTTINGEN, GERMANY ID LONG-RANGE-ORDER; SEMICONDUCTOR ALLOYS; OPTICAL-PROPERTIES; BAND AB Using time-resolved small-signal exciton absorption bleaching at low temperature, the optical transition energies from all three valence bands in spontaneously-ordered GaInP have been measured with high accuracy. The origin of the bleaching signal and the contributions of binding energy are discussed. With three measured energies from each sample, all parameters in the quasi-cubic pertur bation model can be fitted. Good agreement is obtained with a spin-orbit splitting parameter of 103 meV, nearly independent of the degree of ordering. The ratio of bandgap reduction to crystal-field splitting parameter is found to be 2.7, slightly higher than in previous works. This difference is attributed to a more accurate determination of light-hole-like bandgap energy. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Mascarenhas, A (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 12 TC 0 Z9 0 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD NOV 16 PY 1997 VL 164 IS 1 BP 477 EP 480 DI 10.1002/1521-396X(199711)164:1<477::AID-PSSA477>3.0.CO;2-5 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YP830 UT WOS:000071319400095 ER PT J AU Kner, P Bar-Ad, S Marquezini, MV Chemla, DS Schafer, W AF Kner, P Bar-Ad, S Marquezini, MV Chemla, DS Schafer, W TI Exciton-exciton correlations in high magnetic fields SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article; Proceedings Paper CT 5th International Meeting on Optics of Excitons in Confined Systems (OECS 5) CY AUG 10-14, 1997 CL GOTTINGEN, GERMANY ID FANO RESONANCES; SEMICONDUCTORS; DYNAMICS AB The results of femtosecond four-wave mixing experiments in bulk GaAs in high magnetic field are presented. At high magnetic field and level density, our measurements are dominated by features that cannot be explained by the semiconductor Bloch equations. These features are due to exciton-exciton correlations and are accounted for by a calculation based on the chi(3)-truncation formalism. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Hochstleistungsrechenzentrum Forschungszentrum Ju, Julich, Germany. RP Kner, P (reprint author), Univ Calif Berkeley, Dept Phys, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 17 TC 7 Z9 7 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD NOV 16 PY 1997 VL 164 IS 1 BP 579 EP 585 DI 10.1002/1521-396X(199711)164:1<579::AID-PSSA579>3.0.CO;2-U PG 7 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA YP830 UT WOS:000071319400114 ER PT J AU Morosin, B Dunn, RG Assink, R Massis, TM Fronabarger, J Duesler, EN AF Morosin, B Dunn, RG Assink, R Massis, TM Fronabarger, J Duesler, EN TI The secondary explosive tetraammine-cis-bis(5-nitro-2H-tetrazolato-N-2)cobalt perchlorate at 293 and 213 K SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB For the title compound, (OC-6-22)-[Co(CN5O2)(2)-(NH3)(4)]ClO4, the structure determination confirms the cis relationship of the two ring ligands deduced from NMR and shows that these ligands involve N-2 bonding to the Co atom. The accompanying low-temperature study suggests several O atoms of the ClO4- ion are slightly disordered rather than having large thermal displacements. C1 PACIFIC SCI,GOODYEAR,AZ 85338. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP Morosin, B (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 25 Z9 28 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD NOV 15 PY 1997 VL 53 BP 1609 EP 1611 DI 10.1107/S0108270197007634 PN 11 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA YK416 UT WOS:A1997YK41600042 ER PT J AU Kim, JY Carver, EA Stubbs, L AF Kim, JY Carver, EA Stubbs, L TI Amplification and sequencing of end fragments from bacterial artificial chromosome clones by single-primer polymerase chain reaction SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID WALKING; CLONING; PCR RP Kim, JY (reprint author), UNIV TENNESSEE,GRAD SCH BIOMED SCI,OAK RIDGE NATL LAB,DIV LIFE SCI,POB 2009,OAK RIDGE,TN 37831, USA. OI Stubbs, Lisa/0000-0002-9556-1972 NR 11 TC 4 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD NOV 15 PY 1997 VL 253 IS 2 BP 272 EP 275 DI 10.1006/abio.1997.2404 PG 4 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA YG994 UT WOS:A1997YG99400022 PM 9367517 ER PT J AU Farkas, T Guiochon, G AF Farkas, T Guiochon, G TI Contribution of the radial distribution of the flow velocity to band broadening in HPLC columns SO ANALYTICAL CHEMISTRY LA English DT Article ID LIQUID-CHROMATOGRAPHY; CYLINDRICAL SYMMETRY; HETEROGENEITY; HOMOGENEITY; DISPERSION; EFFICIENCY AB The radial distributions of the local linear velocity of the mobile phase, the local efficiency, and the local analyte concentration were determined at the outlet of 0.3-0.4 in. i.d. chromatographic columns by simultaneously recording the elution bands at different radial locations over the column exit cross section, The now profiles exhibited by these columns are parabolic in shape, as was found previously for analytical and preparative size columns, The linear velocity measured in the wall region of the packing is about 2-5% lower than that in the center of the column, depending on the quality of the packed bed, The local efficiency is highest in the core region of the packed bed, where local, on-column detection would yield better separations, exhibiting a higher degree of resolution, The radial distribution of the analyte concentration is not uniform but shows important fluctuations along the radius of the column, The differences in local linear velocity, local efficiency, and local analyte concentration observed are the smallest for the most efficient columns. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 29 TC 77 Z9 78 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1997 VL 69 IS 22 BP 4592 EP 4600 DI 10.1021/ac970530m PG 9 WC Chemistry, Analytical SC Chemistry GA YF130 UT WOS:A1997YF13000016 ER PT J AU Wei, C Bard, AJ Feldberg, SW AF Wei, C Bard, AJ Feldberg, SW TI Current rectification at quartz nanopipet electrodes SO ANALYTICAL CHEMISTRY LA English DT Article ID SCANNING ELECTROCHEMICAL MICROSCOPY; ION-CONDUCTANCE MICROSCOPE; POTENTIOMETRIC MICROSCOPY AB Ag/AgCl reference electrodes fabricated from pulled quartz tubes with orifice radii of 20 mn to 20 mu m were characterized in KCI solutions of different concentrations by cyclic voltammetry. Linear current-voltage (i-V) dependence was observed with micropipet electrodes (with micrometer-sized tips) with the same concentration (0.01-1 M) of KCI inside and outside the pipet, but current rectification was found at nanopipet electrodes at KCl concentrations of less than or equal to 0.1 M (with nanometer-sized tips), This is attributed to formation of a diffuse electrical double layer within the tip orifice. The effects of electrode size, electrolyte concentration, and solution pH on the nonlinear i-V behavior of these electrodes were investigated. A model for the observed behavior shows the rectification to be caused by the permselectivity in the tip region and the geometric asymmetry of the tip orifice. This phenomenon may be important in studies of ion transport in charged channels and porous membranes. C1 UNIV TEXAS,DEPT CHEM & BIOCHEM,AUSTIN,TX 78712. BROOKHAVEN NATL LAB,DEPT APPL SCI,LONG ISL CITY,NY 11973. NR 13 TC 252 Z9 254 U1 13 U2 76 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1997 VL 69 IS 22 BP 4627 EP 4633 DI 10.1021/ac970551g PG 7 WC Chemistry, Analytical SC Chemistry GA YF130 UT WOS:A1997YF13000021 ER PT J AU Lersch, R Gee, SL Wu, M Conboy, JG AF Lersch, R Gee, SL Wu, M Conboy, JG TI Protein 4.1 exon 16 splicing requires functional interaction between a conserved 3' splice site and the regulated downstream 5' splice site. SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 198 EP 198 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42400198 ER PT J AU Wang, Z Ma, L Paszty, C Narla, M Kosower, N Schrier, SL AF Wang, Z Ma, L Paszty, C Narla, M Kosower, N Schrier, SL TI The role of oxidation in the severity of anemia in murine beta thalassemia. SO BLOOD LA English DT Meeting Abstract C1 STANFORD UNIV,SCH MED,DIV HEMATOL,STANFORD,CA 94305. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 571 EP 571 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42400571 ER PT J AU Podsakoff, GM Paszty, C Colosi, PC McQuiston, SA Kuypers, FA Witkowska, HE Mohandas, N Kurtzman, GJ AF Podsakoff, GM Paszty, C Colosi, PC McQuiston, SA Kuypers, FA Witkowska, HE Mohandas, N Kurtzman, GJ TI Single dose, long-term treatment of beta-thalassemia in mice following intramuscular administration of the erythropoietin gene. SO BLOOD LA English DT Meeting Abstract C1 AVIGEN,ALAMEDA,CA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA. CHILDRENS HOSP,OAKLAND RES INST,OAKLAND,CA 94609. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 1058 EP 1058 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42401058 ER PT J AU Parra, M Gascard, P Walensky, LD Snyder, SH Mohandas, N Conboy, JG AF Parra, M Gascard, P Walensky, LD Snyder, SH Mohandas, N Conboy, JG TI A family of distinct protein 4.1 genes is expressed in human tissues. SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DIV LIFE SCI,BERKELEY,CA 94720. JOHNS HOPKINS UNIV,BALTIMORE,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 1167 EP 1167 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42401166 ER PT J AU Shi, ZT Walensky, LD Snyder, SH Nelson, RJ Conboy, JG Mohandas, N Rubin, E AF Shi, ZT Walensky, LD Snyder, SH Nelson, RJ Conboy, JG Mohandas, N Rubin, E TI Protein 4.1-R knockout mice exhibit mechanically unstable erythrocytes and unexpected neurological defects. SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,DIV LIFE SCI,BERKELEY,CA 94720. JOHNS HOPKINS SCH MED,DEPT NEUROSCI,BALTIMORE,MD. JOHNS HOPKINS UNIV,DEPT PSYCHOL,BALTIMORE,MD 21218. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 1168 EP 1168 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42401167 ER PT J AU Pallavicini, MG Grewal, L AF Pallavicini, MG Grewal, L TI Genomic instability in mice with varying genetic susceptibility to radiation induced leukemia. SO BLOOD LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,CTR CANC,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 1425 EP 1425 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42401424 ER PT J AU Wiseman, GA Solinger, AM GrilloLopez, A Stabin, M Dunn, WL Witzig, TE Spies, S Gordon, L Raubitschek, A Margolin, K Karvelis, K Janakiraman, N Silverman, DH Emmanoulides, C Royston, I Chinn, P Parker, E Carter, W White, CA AF Wiseman, GA Solinger, AM GrilloLopez, A Stabin, M Dunn, WL Witzig, TE Spies, S Gordon, L Raubitschek, A Margolin, K Karvelis, K Janakiraman, N Silverman, DH Emmanoulides, C Royston, I Chinn, P Parker, E Carter, W White, CA TI IDEC-Y2B8 (Y-90 conjugated anti-CD20) dosimetry calculated from In-111 anti-CD20 in patients with low and intermediate grade B-cell non-Hodgkin's lymphoma (NHL) emphasis on bone marrow (BM). SO BLOOD LA English DT Meeting Abstract C1 MAYO CLIN & MAYO FDN,ROCHESTER,MN 55905. IDEC PHARMACEUT CORP,SAN DIEGO,CA. OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN. NORTHWESTERN UNIV,CHICAGO,IL 60611. CITY HOPE NATL MED CTR,DUARTE,CA 91010. HENRY FORD HOSP,DETROIT,MI 48202. UNIV CALIF LOS ANGELES,LOS ANGELES,CA. SIDNEY KIMMELL CANC CTR,SAN DIEGO,CA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 2273 EP 2273 PN 1 PG 1 WC Hematology SC Hematology GA YG424 UT WOS:A1997YG42402269 ER PT J AU Roa, D Kopsombut, P Iyamu, W Popp, R Aguinaga, MDP Turner, EA AF Roa, D Kopsombut, P Iyamu, W Popp, R Aguinaga, MDP Turner, EA TI Effect of hydroxyurea on mice hemoglobin. SO BLOOD LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. MEHARRY MED COLL,CTR COMPREHENS SICKLE CELL,DEPT PEDIAT & INTERNAL MED,NASHVILLE,TN 37208. MEHARRY MED COLL,CTR COMPREHENS SICKLE CELL,DEPT PHARMACOL,NASHVILLE,TN 37208. MEHARRY MED COLL,CTR COMPREHENS SICKLE CELL,DEPT OBSTET & GYNECOL,NASHVILLE,TN 37208. NR 0 TC 0 Z9 0 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 2824 EP 2824 PN 2 PG 1 WC Hematology SC Hematology GA YG425 UT WOS:A1997YG42500134 ER PT J AU Wilhide, CC Jin, Y Guo, QB Li, L Li, SX Rubin, E Bray, PF AF Wilhide, CC Jin, Y Guo, QB Li, L Li, SX Rubin, E Bray, PF TI The human integrin beta(3) gene is 63 kb and contains a 5'-UTR sequence regulating expression SO BLOOD LA English DT Article ID PLATELET GLYCOPROTEIN-IIIA; MEGAKARYOCYTIC CELL-LINE; VITRONECTIN-RECEPTOR; GLANZMANN THROMBASTHENIA; 5'-UNTRANSLATED REGION; EMBRYONIC FIBROBLASTS; ADHESION RECEPTORS; MENSTRUAL-CYCLE; MESSENGER-RNA; HIGH-LEVEL AB The human blood platelet fibrinogen receptor, integrin alpha(IIb)beta(3) (glycoprotein IIb-IIIa) is an archetypal member of the integrin family of adhesive molecules and is the only integrin encoded by genes physically linked in the genome. Because studies on the normal and abnormal expression of any gene require a thorough understanding of its organization, the initial goals of the current study were to determine the size and complete the genomic organization for the beta(3) gene. We now report the isolation of the entire beta(3) gene in a single P1 plasmid and for the first time have linked the first and second exons on a contiguous fragment of DNA. Using pulsed-field gel analysis, we determined the full size of the beta(3) gene to be 63 kb and show a large (16.7 kb) first intron; based on this information, we propose a uniform numbering system for the beta(3) exons. We have completed the 5' genomic structure and generated a long-range restriction map. The promoter and the 5' end of the first intron were found to have approximately 50% sequence identity with a region of the avian beta(3) gene known to possess functional transcriptional activity. Analysis of three different homologous regions led to the identification of a sequence in the 5'-UTR of the human gene, CCGCGGGAGG, which shares 90% identity with the avian gene and which bound nuclear proteins in DNasel and electrophoretic mobility shift assay studies. Mutating this sequence caused a 2.6-fold reduction in reporter gene activity. In these studies we have (1) determined the full length and 5' organization of the beta(3) gene, (2) identified a large region of homology between the 5' regions of the avian and human genes, and (3) identified a sequence in the 5'-UTR that augments gene expression. Knowing the genomic structure of beta(3) has permitted the uncovering of new mechanisms of mutagenesis causing Glanzmann thrombasthenia (Jin et al, J Clin Invest 98:1745, 1996), and our findings will be valuable for such genetic analyses as well as for studies on the transcriptional regulation of beta(3) and other integrin genes. (C) 1997 by The American Society of Hematology. C1 JOHNS HOPKINS SCH MED,DEPT MED,DIV HEMATOL,BALTIMORE,MD. LAWRENCE BERKELEY LAB,BERKELEY,CA. FU NHLBI NIH HHS [HL51457] NR 57 TC 30 Z9 30 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 BP 3951 EP 3961 PG 11 WC Hematology SC Hematology GA YF299 UT WOS:A1997YF29900016 PM 9354663 ER PT J AU Nilsson, SK Dooner, MS Weier, HUG Frenkel, B Lian, JB Stein, GS Quesenberry, PJ AF Nilsson, SK Dooner, MS Weier, HUG Frenkel, B Lian, JB Stein, GS Quesenberry, PJ TI Osteoblast progenitors engraft from whole bone marrow transplants in nonablated mice. SO BLOOD LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA. UNIV MASSACHUSETTS,MED CTR,WORCESTER,MA. RI Nilsson, Susie/C-5563-2015 OI Nilsson, Susie/0000-0002-7926-7335 NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1997 VL 90 IS 10 SU 1 BP 4174 EP 4174 PN 2 PG 1 WC Hematology SC Hematology GA YG425 UT WOS:A1997YG42501483 ER PT J AU Dubey, MK Smith, GP Hartley, WS Kinnison, DE Connell, PS AF Dubey, MK Smith, GP Hartley, WS Kinnison, DE Connell, PS TI Rate parameter uncertainty effects in assessing stratospheric ozone depletion by supersonic aviation SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Box model sensitivity-uncertainty calculations for O-3 depletion from supersonic aircraft emissions were performed at the most perturbed locale using localized outputs of the LLNL 2-D diurnally averaged assessment model. Processes controlling N2O5, catalytic O-3 loss steps O+NO2 and HO2+O-3, HOx sink reactions OH+ HNO3/HNO4, and the O+O-2 recombination that forms O-3 are identified as the dominant photochemical uncertainty sources, Guided by local sensitivities, 2-D model runs were repeated with 9 targeted input parameters altered to 1/3 of their 1-sigma uncertainties to put error-bounds on the predicted O-3 change, Results indicate these kinetic errors can cause the predicted local O-3 loss of 1.5% to be uncertain by up to 3% in regions of large aircraft NOx injection. C1 SRI INT,MENLO PK,CA 94025. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP Dubey, MK (reprint author), LOS ALAMOS NATL LAB,MS J585,CST-6,LOS ALAMOS,NM 87545, USA. RI Dubey, Manvendra/E-3949-2010 OI Dubey, Manvendra/0000-0002-3492-790X NR 7 TC 10 Z9 10 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV 15 PY 1997 VL 24 IS 22 BP 2737 EP 2740 DI 10.1029/97GL02859 PG 4 WC Geosciences, Multidisciplinary SC Geology GA YG509 UT WOS:A1997YG50900013 ER PT J AU Schultz, CA AF Schultz, CA TI A density-tapering approach for modeling the seismic response of free-surface topography SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID WAVE-PROPAGATION; SITE AB This study investigates the accuracy of a density-tapering approach for modeling the seismic response of free-surface topography on a fourth-order staggered finite-difference grid. The accuracy of the boundary condition near the free-surface and at-depth is rigorously tested in 2D where noise artifacts are identified and characterized. This technique is then modified using spatial density filters, to reduce the noise artifacts while retaining the accuracy, stability, and computational efficiency of the original algorithm. The modified density-tapering boundary condition is accurate down to 15 points per wavelength (PPW) with noise levels below 5% in almost all instances. This multi-step technique adjusts only the material properties near the taper zone allowing it to remain a preprocessing technique, applied prior to the finite-difference calculation. RP Schultz, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,L-205,LIVERMORE,CA 94551, USA. NR 14 TC 3 Z9 4 U1 2 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV 15 PY 1997 VL 24 IS 22 BP 2809 EP 2812 DI 10.1029/97GL02896 PG 4 WC Geosciences, Multidisciplinary SC Geology GA YG509 UT WOS:A1997YG50900031 ER PT J AU Albinati, A Bracher, G Carmona, D Jans, JHP Klooster, WT Koetzle, TF Macchioni, A Ricci, JS Thouvenot, R Venanzi, LM AF Albinati, A Bracher, G Carmona, D Jans, JHP Klooster, WT Koetzle, TF Macchioni, A Ricci, JS Thouvenot, R Venanzi, LM TI Synthetic and reactivity studies of some asymmetric dinuclear platinum(II) monohydrido-bridged cations. The neutron diffraction structure of [(PEt3)(2)(Ph)Pt(mu-H)PtH(PEt3)(2)][BPh4] SO INORGANICA CHIMICA ACTA LA English DT Article DE neutron diffraction; platinum complexes; hydrido-bridged complexes; dinuclear complexes ID MOLECULAR-STRUCTURE; TRIHYDRIDE COMPLEXES; CRYSTAL; LIGANDS; C-13; CENTERS; CIS; H-1 AB The complexes [(PEt3)(2)(Ar)Pt(mu-H)PtH(PEt3)(2)][BPh4] (Ar=Ph, 2,4-Me2C6H3, 2,4,6-Me3C6H2) were prepared and characterized. Multinuclear, multidimensional NMR studies of these complexes show that, in solution, (i) they exist in rapidly interconverting conformers which retain the bent Pt(mu-H)PtH moieties found in the solid state, (ii) the coordination at each platinum atom is square planar, (iii) the two coordination planes are perpendicular to each other and (iv) the aryl group is perpendicular to the coordination plane of the platinum atom to which it is bonded. The complex [(PEt3)(2)(Ph)Pt(mu-H)PtH(PEt3)(2)][BPh4] does not react with C2H4 and CH2:CH . CO2Me. At -60 degrees C or above, [(PEt3)(2)(Ph)Pt(mu-H)PtH(PEt3)(2)][BPh4] reacts with CO giving the platinum(II) cations trans-[PtX(CO)(PEt3)(2)](+) (X=H and Ph), and [PtH(PEt3)(3)](+) and the platinum(0) carbonyl cluster [Pt-4(mu-CO)(5)(PEt3)(4)]. The crystal structure of [(PEt3)(2)(Ph)Pt(mu-H)PtH(PEt3)(2)][BPh4], [BPh4], obtained by neutron diffraction, shows that the Pt-H-Pt bond angle in this cation is 125(1)degrees indicating that the interaction between these three atoms is weak. (C) 1997 Elsevier Science S.A. C1 ETH ZENTRUM,ANORGAN CHEM LAB,CH-8092 ZURICH,SWITZERLAND. UNIV MILAN,IST CHIM FARMACEUT,I-20131 MILAN,ITALY. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Macchioni, Alceo/F-1234-2014; Carmona Gascon, Daniel/H-5323-2015; Albinati, Alberto/I-1262-2015 OI Macchioni, Alceo/0000-0001-7866-8332; Carmona Gascon, Daniel/0000-0003-4196-5856; Albinati, Alberto/0000-0002-8779-3327 NR 43 TC 13 Z9 13 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD NOV 15 PY 1997 VL 265 IS 1-2 BP 255 EP 265 DI 10.1016/S0020-1693(97)05746-0 PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA YE916 UT WOS:A1997YE91600030 ER PT J AU Freitag, LA OllivierGooch, C AF Freitag, LA OllivierGooch, C TI Tetrahedral mesh improvement using swapping and smoothing SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE mesh improvement; local reconnection; mesh smoothing; optimal smoothing ID LOCAL TRANSFORMATIONS; FINITE; TRIANGULATIONS; GENERATION AB Automatic mesh generation and adaptive refinement methods for complex three-dimensional domains have proven to be very successful tools for the efficient solution of complex applications problems. These methods can, however, produce poorly shaped elements that cause the numerical solution to be less accurate and more difficult to compute. Fortunately, the shape of the elements can be improved through several mechanisms, including face-and edge-swapping techniques, which change local connectivity, and optimization-based mesh smoothing methods, which adjust mesh point location. We consider several criteria for each of these two methods and compare the quality of several meshes obtained by using different combinations of swapping and smoothing. Computational experiments show that swapping is critical to the improvement of general mesh quality and that optimization-based smoothing is highly effective in eliminating very small and very large angles. High-quality meshes are obtained in a computationally efficient manner by using optimization-based smoothing to improve only the worst elements and a smart variant of Laplacian smoothing on the remaining elements. Based on our experiments, we offer several recommendations for the improvement of tetrahedral meshes. (C) 1997 John Wiley & Sons, Ltd. C1 UNIV BRITISH COLUMBIA,DEPT MECH ENGN,VANCOUVER,BC V6T 1Z4,CANADA. RP Freitag, LA (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,MCS 221-C236,ARGONNE,IL 60439, USA. RI Ollivier-Gooch, Carl/E-8934-2011 OI Ollivier-Gooch, Carl/0000-0001-6514-058X NR 23 TC 157 Z9 171 U1 0 U2 10 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 15 PY 1997 VL 40 IS 21 BP 3979 EP 4002 DI 10.1002/(SICI)1097-0207(19971115)40:21<3979::AID-NME251>3.0.CO;2-9 PG 24 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA YA179 UT WOS:A1997YA17900006 ER PT J AU Clements, BE Johnson, JN Addessio, FL AF Clements, BE Johnson, JN Addessio, FL TI Wave propagation in an epoxy-graphite laminate SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID COMPOSITE-MATERIALS AB The third-order, nonhomogenized, dynamic method of cells is used to calculate the particle velocity for a shock wave experiment involving an epoxy-graphite laminate. Constitutive relations suitable for the various materials are used. This includes linear and nonlinear elasticity and, when appropriate, viscoelasticity. It is found to be beneficial to incorporate artificial viscosity into the analysis. Artificial viscosity successfully removes the unphysical high-frequency ringing in the numerical solutions of the theory, while leaving the physical oscillations, characteristic of wave propagation in a periodic laminate, largely undiminished. It also allows the viscoelastic relaxed moduli to be closer to their unrelaxed counterparts than in a previous calculation, thus making them more acceptable. The results agree well with the corresponding plate-impact experiment, and are compared to the second-order theory of Clements, Johnson, and Hixson [Phys. Rev. E, 54, 6876 (1996)]. (C) 1997 American Institute of Physics. RP Clements, BE (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 6 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1997 VL 82 IS 10 BP 4831 EP 4837 DI 10.1063/1.366343 PG 7 WC Physics, Applied SC Physics GA YG473 UT WOS:A1997YG47300019 ER PT J AU Michiels, J Gschneidner, KA AF Michiels, J Gschneidner, KA TI Effect of long term heat treatment on the electrical properties of RSe1.47 (R=La and Nd) and LaSe1.48 SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The phase stability of the gamma-cubic LaSe1.47, LaSe1.48 and NdSe1.47 compounds with the Th3P4 type structure, along with their electrical resistivity, Seebeck coefficient, and Hall effect were measured periodically as the materials were annealed at 800 degrees C or 1000 degrees C to determine their potential as thermoelectric materials for long term applications at high temperatures. The LaSex samples showed the presence of the ternary oxide La10Se14O (beta-phase), The content of this phase; increased with increasing anneal time, whereas the NdSe1.47 samples showed no sign of a ternary oxide second phase. The room temperature electrical resistivity and Seebeck coefficient of LaSe, increased with increased annealing time, while those of NdSe1.47 decreased, The power factors remained relatively stable with annealing time. The high temperature electrical resistivity of LaSe1.47 and NdSe1.47 increased with increasing temperature up to 1000 degrees C, while the Seebeck coefficient became more negative. The power factor, however, peaks at 800 degrees C for LaSe1.47 and at 500 degrees C for NdSe1.47. Based an this study we find that LaSex is not a promising high temperature thermoelectric material due to the formation of the beta-phase, whereas the NdSe1.47 which does not form the P-phase oxide is a potential candidate material. (C) 1997 American Institute of Physics. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. NR 13 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1997 VL 82 IS 10 BP 4952 EP 4956 DI 10.1063/1.366293 PG 5 WC Physics, Applied SC Physics GA YG473 UT WOS:A1997YG47300039 ER PT J AU Warren, WL Seager, CH Sun, SS Naman, A Holloway, PH Jones, KS Soininen, E AF Warren, WL Seager, CH Sun, SS Naman, A Holloway, PH Jones, KS Soininen, E TI Microstructure and atomic effects on the electroluminescent efficiency of SrS:Ce thin film devices SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON-PARAMAGNETIC-RESONANCE; LUMINESCENCE AB Transmission electron microscopy and x-ray diffraction data show that rapid thermal anneals of SrS:Ce thin films enhance grain size and reduce crystalline defects. Electron paramagnetic resonance results suggest that these anneals lead to less variance in the crystal field environments at the nearly cubic Ce3+ sites along with the formation of another type of Ce3+ sire believed to involve a nearby Sr vacancy. We suggest that the association of Ce3+ sites with V-Sr shifts the electroluminescence towards larger wavelengths as the symmetry of the activator sire is lowered. (C) 1997 American Institute of Physics. C1 PLANAR AMER INC,BEAVERTON,OR 97006. UNIV FLORIDA,DEPT MAT SCI,GAINESVILLE,FL 32611. PLANAR INT LTD,SF-02201 ESPOO,FINLAND. RP Warren, WL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 25 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1997 VL 82 IS 10 BP 5138 EP 5143 DI 10.1063/1.366547 PG 6 WC Physics, Applied SC Physics GA YG473 UT WOS:A1997YG47300073 ER PT J AU Wright, AF AF Wright, AF TI Basal-plane stacking faults and polymorphism in AlN, GaN, and InN SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON-MICROSCOPY; PSEUDOPOTENTIALS; SEMICONDUCTORS; CRYSTALS AB Energies of basal-plane stacking faults in wurtzite AlN, GaN, and InN are determined using a one-dimensional Ising-type model incorporating effective layer-layer interactions obtained from density-functional-theory calculations. Stacking-fault energies are found to be largest for AIN and smallest for GaN consistent with density-functional results for the wurtzite/zinc-blende energy differences. Estimates are also given for stacking-fault energies in the zinc-blende structure. The values are negative, consistent with observations that nominal zinc-blende films typically contain large numbers of stacking faults. A related result is that hexagonal structures with stacking sequences repeating after four and six bilayers have lower energies than zinc-blende for all three compounds. (C) 1997 American Institute of Physics. RP Wright, AF (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 18 TC 49 Z9 49 U1 2 U2 28 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1997 VL 82 IS 10 BP 5259 EP 5261 DI 10.1063/1.366393 PG 3 WC Physics, Applied SC Physics GA YG473 UT WOS:A1997YG47300092 ER PT J AU Zanni, MT Taylor, TR Greenblatt, BJ Soep, B Neumark, DM AF Zanni, MT Taylor, TR Greenblatt, BJ Soep, B Neumark, DM TI Characterization of the I-2(-) anion ground state using conventional and femtosecond photoelectron spectroscopy SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STIMULATED RAMAN-SCATTERING; VIBRATIONAL WAVE-PACKET; I2-(CO2)N CLUSTER IONS; AB-INITIO CALCULATIONS; RECOMBINATION DYNAMICS; PUMP-PROBE; MULTIPHOTON IONIZATION; IMPULSIVE EXCITATION; TRANSITION-STATE; SURFACE DYNAMICS AB The (X) over tilde (2) Sigma(u)(+) state of the I-2(-) anion has been fit to a Morse potential using data from two techniques: conventional and femtosecond photoelectron spectroscopy (FPES). Conventional photoelectron spectroscopy is used to determine the adiabatic electron affinity of I-2 as well as the well depth and equilibrium nuclear geometry of I-2(-). In the FPES experiment, the pump pulse induces coherent nuclear motion on the ground state of I-2(-) by resonant impulsive stimulated Raman scattering (RISRS), and the vibrational frequency of the anion is determined from the resulting oscillatory structure in the time-dependent photoelectron spectra. We find the electron affinity (EA) of I-2 to be 2.524 +/- 0.005 eV, the well depth (D-e) for I-2(-) to be 1.014 +/- 0.005 eV, the equilibrium internuclear separation (R-e) to be 3.205 +/- 0.005 Angstrom, and the vibrational frequency to be 110 +/- 2 cm(-1). These values for the I-2(-) potential parameters differ significantly from previous results. (C) 1997 American Institute of Physics. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Zanni, Martin/K-2707-2013; Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 50 TC 81 Z9 81 U1 0 U2 14 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1997 VL 107 IS 19 BP 7613 EP 7619 DI 10.1063/1.475110 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG655 UT WOS:A1997YG65500003 ER PT J AU Wang, XB Wang, LS AF Wang, XB Wang, LS TI Electronic structure and photoelectron spectroscopy of AlSi mixed dimer SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IONIZED CLUSTER BEAM; SMALL SILICON CLUSTERS; ABINITIO CALCULATIONS; ALUMINUM CLUSTERS; NEGATIVE-IONS; GROUND-STATE; AL-2; SI-2; TRANSITION; ENERGIES AB The electronic structure of the heterodimer AlSi is experimentally studied using anion photoelectron spectroscopy. Four low-lying electronic excited states are observed for AlSi. The electron affinity of AlSi is measured to be 1.32 (5) eV, which is lower than that of both Al-2 and Si-2. The electronic structure of AlSi is understood by comparing to that of the known Al-2 and Al-2(-) molecules. The ground state of AlSi is determined to be X (4) Sigma(-) with a vibrational frequency of 400 (50) cm(-1). The four excited states are A (2) Sigma(-), B (2) Delta, C (2) Pi, and D (2) Sigma(+) with excitation energies of 0.23, 0.67, 0.82, and 1.13 eV, respectively. The photoelectron spectra of Al-2(-) are also presented and excited states of the Al-2(-) anion are definitively observed. The electronic structure of AlSi is discussed and compared to that of the homonuclear dimers, Al-2 and Si-2. (C) 1997 American Institute of Physics. C1 PACIFIC NW LAB, WR WILEY ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RP Wang, XB (reprint author), WASHINGTON STATE UNIV, DEPT PHYS, RICHLAND, WA 99352 USA. NR 31 TC 9 Z9 9 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1997 VL 107 IS 19 BP 7667 EP 7672 DI 10.1063/1.475116 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG655 UT WOS:A1997YG65500009 ER PT J AU Yang, CY Gray, SK AF Yang, CY Gray, SK TI The effect of angular momentum on the unimolecular dissociation HCO->H+CO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DISCRETE VARIABLE REPRESENTATION; H+CO-REVERSIBLE-HCO; H + CO; QUANTUM-DYNAMICS; RESONANCE ENERGIES; FILTER-DIAGONALIZATION; STATE DISTRIBUTIONS; SCATTERING; ROTATION; WIDTHS AB Full dimensional wave packet calculations are performed to model the unimolecular dissociation HCO --> H + CO on its ground electronic state. Results of calculations up to total (nuclear) angular momentum J = 10 are reported. Most of our results are based on the recent potential surface of Werner, Keller, Schinke, and co-workers, although some comparative results with the earlier surface of Bowman, Bittman, and Harding are also presented. We focus on certain unimolecular resonances, and determine their positions, widths, and associated CO product distributions. We find good agreement with the available experimental results of Neyer et al. We also consider how rotation affects a group of states associated with the 2:1 stretch/bend resonance. Bowman's adiabatic rotation model is found to provide a reasonable description of our results, and is also a useful tool for analysis. (C) 1997 American Institute of Physics. RP Yang, CY (reprint author), ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439, USA. NR 40 TC 28 Z9 28 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 NOV 15 PY 1997 VL 107 IS 19 BP 7773 EP 7786 DI 10.1063/1.475091 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG655 UT WOS:A1997YG65500020 ER PT J AU Althorpe, SC Kouri, DJ Hoffman, DK AF Althorpe, SC Kouri, DJ Hoffman, DK TI Further partitioning of the reactant-product decoupling equations of state-to-state reactive scattering and their solution by the time-independent wave-packet method SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; LIPPMANN-SCHWINGER EQUATIONS; POTENTIAL-ENERGY SURFACE; REACTION PROBABILITIES; 6 DIMENSIONS; ACCURATE; H-3 AB The reactant-product decoupling (RPD) equations are a rigorous formulation of state-to-state reactive scattering recently introduced by Peng and Zhang. For an N-arrangement reaction there are a total of N RPD equations, each of which describes the dynamics in just one region of coordinate space. One of the regions (the r-region) encloses the reactant channel and the strong interaction region; each of the other N - 1 regions encloses one of the product channels. In this paper we develop a suggestion later made by Kouri and co-workers: that the original RPD equations can be further partitioned into a set of new RPD equations, in which the original r-region is now partitioned into three regions-two enclosing the reactant channel, and one enclosing the strong interaction region. After introducing the new RPD equations, we derive the time-independent wave-packet (TIW) form of the equations, and show how to solve them using an extended version of the Chebyshev propagator. We test the new RPD equations (and the method) by calculating state-to-state reaction probabilities and inelastic probabilities for the three-dimensional (J = 0) H + H-2 reaction. (C) 1997 American Institute of Physics. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP Althorpe, SC (reprint author), UNIV HOUSTON,DEPT CHEM,UNIV PK,HOUSTON,TX 77204, USA. NR 28 TC 45 Z9 45 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1997 VL 107 IS 19 BP 7816 EP 7824 DI 10.1063/1.475095 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG655 UT WOS:A1997YG65500024 ER PT J AU Wang, JH Liu, K Schatz, GC terHorst, M AF Wang, JH Liu, K Schatz, GC terHorst, M TI Experimental and theoretical angular and translational energy distributions for the reaction CN+D-2->DCN+D SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VIBRATIONALLY EXCITED HCN; REACTION DYNAMICS; CROSSED-BEAM; CN+H-2 REACTION; SCATTERING; PRODUCT; CN; H-2+CN->H+HCN; SECTIONS; CN+D-2 AB This paper presents new measurements of angular and translational energy distributions for the title reaction at a reagent kinetic energy of 5.8 kcal/mol, and compares them with the corresponding results from quasiclassical trajectory calculations based on an accurate global potential energy surface. The comparison of theory and experiment is generally good; however, the minor deviations that we find provide valuable information concerning errors in the potential energy surface. Both experiment and theory indicate that CN+D-2 is a simple abstraction reaction, with predominantly backward-scattered angular distributions and about 37% of the available energy ending up in product translation. Strong dependence of the calculated angular and translational energy distributions on reagent kinetic energy is noted. (C) 1997 American Institue of Physics. C1 ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. RP Wang, JH (reprint author), ACAD SINICA,INST ATOM & MOL SCI,POB 23-166,TAIPEI 10764,TAIWAN. RI Liu, Kopin/F-7929-2012 NR 30 TC 31 Z9 32 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1997 VL 107 IS 19 BP 7869 EP 7875 DI 10.1063/1.475099 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG655 UT WOS:A1997YG65500029 ER PT J AU Tuzun, RE Noid, DW Sumpter, BG AF Tuzun, RE Noid, DW Sumpter, BG TI Efficient treatment of out-of-plane bend and improper torsion interactions in MM2, MM3, and MM4 molecular mechanics calculations SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article DE molecular mechanics; geometric statement function method; inplane and out-of-plane bend; improper torsion; MM2, MM3, and MM4 force fields ID CONJUGATED HYDROCARBONS; FORCE-FIELD; DYNAMICS; POLYMERS; ALKENES AB Simple and very efficient formulas are presented for four-body out-of-plane bend (used in MM2 and MM3 force fields) and improper torsion (used in the MM4 force field) internal coordinates and their first and second derivatives. The use of a small set of bend and stretch. intermediates allows for order of magnitude decreases in calculation time for potential energies and their first and second derivatives, which are required in molecular mechanics calculations. The formulas are eminently suitable for use in molecular simulations of systems with complicated bond networks. (C) 1997 John Wiley & Sons, Inc. RP Tuzun, RE (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 14 TC 14 Z9 14 U1 1 U2 7 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD NOV 15 PY 1997 VL 18 IS 14 BP 1804 EP 1811 DI 10.1002/(SICI)1096-987X(19971115)18:14<1804::AID-JCC9>3.0.CO;2-O PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA YB524 UT WOS:A1997YB52400009 ER PT J AU Adalsteinsson, D Sethian, JA AF Adalsteinsson, D Sethian, JA TI A level set approach to a unified model for etching, deposition, and lithography .3. Redeposition, reemission, surface diffusion, and complex simulations SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID HAMILTON-JACOBI EQUATIONS; FREE MOLECULAR-TRANSPORT; MEAN-CURVATURE; PROPAGATING INTERFACES; RECTANGULAR TRENCHES; FLOW; MOTION; ALGORITHMS; FRONTS AB Previously, Adalsteinsson and Sethian have applied the level set formulation to the problem of surface advancement in two and three-dimensional topography simulation of deposition, etching, and lithography processes in integrated circuit fabrication. The level set formulation is based on solving a Hamilton-Jacobi type equation for a propagating level set function, using techniques borrowed from hyperbolic conservation laws. Topological changes, corner, and cusp development, and accurate determination of geometric properties such as curvature and normal direction are naturally obtained in this setting. Part I presented the basic equations and algorithms for two dimensional simulations, including the effects of isotropic and uni-directional deposition and etching, visibility, reflection, and material dependent etch/deposition rates. Part II focused on the extension to three dimensions. This paper completes the series, and add the effects of redeposition, reemission, and surface diffusion. This requires the solution of the transport equations for arbitrary geometries, and leads to simulations that contain multiple simultaneous competing effects of visibility, directional and source flux functions, complex sputter yield flux functions, wide ranges of sticking coefficients for the reemission and redeposition functions, multilayered fronts and thin film layers. (C) 1997 Academic Press. C1 NATL LAWRENCE BERKELEY LAB,DEPT MATH,BERKELEY,CA. RP Adalsteinsson, D (reprint author), UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720, USA. NR 50 TC 44 Z9 44 U1 2 U2 6 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 NOV 15 PY 1997 VL 138 IS 1 BP 193 EP 223 DI 10.1006/jcph.1997.5817 PG 31 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA YJ249 UT WOS:A1997YJ24900009 ER PT J AU Gopal, M Chan, WJM DeJonghe, LC AF Gopal, M Chan, WJM DeJonghe, LC TI Room temperature synthesis of crystalline metal oxides SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MEMBRANES; ALUMINA; FIELD AB Crystalline titanium dioxide powders have been synthesized as either rutile or anatase from aqueous solutions at low temperatures (T less than or equal to 100 degrees C) and atmospheric pressure. First, a sol is prepared by the hydrolysis of a titanium alkoxide in an acidic solution. The sol is subsequently heated at different rates to produce the different crystalline phases of titanium dioxide. Powder characterization was carried out using X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy. In general, the precipitate size was observed to be between 50 and 100 nm. Possible mechanisms involved in determining the crystal variants are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP Gopal, M (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 40 TC 210 Z9 222 U1 3 U2 41 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 NOV 15 PY 1997 VL 32 IS 22 BP 6001 EP 6008 DI 10.1023/A:1018671212890 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA YH337 UT WOS:A1997YH33700013 ER PT J AU Wu, SJ DeJonghe, LC AF Wu, SJ DeJonghe, LC TI Alumina-coated hollow glass spheres alumina composites SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID POWDERS; SULFATE AB Coating of alumina onto the surface of hollow glass spheres was accomplished by controlled heterogeneous precipitation from aqueous solutions. The processing conditions were optimized to yield thin and uniform precursor coatings. After calcination, converting the precursor to alumina, the alumina-coated hollow glass spheres formed free-flowing powders that were used to produce glass/alumina composites with up to 35 vol% of controlled and well dispersed closed porosity. The dielectric constants and the flexural strengths of such porous composites were determined as a function of porosity. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP Wu, SJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 31 TC 19 Z9 22 U1 1 U2 7 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 NOV 15 PY 1997 VL 32 IS 22 BP 6075 EP 6084 DI 10.1023/A:1018691817433 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA YH337 UT WOS:A1997YH33700023 ER PT J AU David, P Efrati, E Tocco, G Krauss, SW Goodman, MF AF David, P Efrati, E Tocco, G Krauss, SW Goodman, MF TI DNA replication and postreplication mismatch repair in cell-free extracts from cultured human neuroblastoma and fibroblast cells SO JOURNAL OF NEUROSCIENCE LA English DT Article DE DNA replication; mismatch repair; abasic lesion bypass; SY5Y neuroblastoma; WI38 fibroblasts; human cell-free extracts; differentiation; Pol alpha; Pol beta ID ESCHERICHIA-COLI; NUCLEAR ANTIGEN; ADAPTIVE MUTATION; OXIDATIVE STRESS; POLYMERASE-ALPHA; EXCISION-REPAIR; GENE-EXPRESSION; BRAIN NEURONS; INVITRO; MUTS AB DNA synthesis and postreplication mismatch repair were measured in vitro using cell-free extracts from cultured human SY5Y neuroblastoma and WI38 fibroblast cells in different growth states. All extracts, including differentiated SY5Y and quiescent WI38 fibroblasts, catalyzed SV40 origin-dependent DNA synthesis, totally dependent on SV40 T-antigen. Thus, although differentiated neuroblastoma and quiescent fibroblasts cells were essentially nondividing, their extracts were competent for DNA replication using DNA polymerases delta, alpha and possibly epsilon, with proliferating cell nuclear antigen. Nonreplicative DNA synthesis and lesion bypass by either alpha- or beta-polymerases were detected independently in extracts using primed or gapped single-stranded DNA templates. Long-patch postreplication mismatch repair was measured for the first time in neuroblastoma cell-free extracts. Extracts from subconfluent and high-density SY5Y cells catalyzed postreplication mismatch repair with efficiencies comparable to those of HeLa cell extracts. No significant differences were observed in repair between SY5Y differentiated and undifferentiated cell extracts. Mismatch repair efficiencies were threefold lower in extracts from subconfluent WI38 cells, and repair in WI38 quiescent cells was fourfold less than in subconfluent cells, suggesting that mismatch repair may be regulated. The spectrum of mismatch repair in SY5Y extracts closely resembled the mismatch removal specificities of HeLa extracts: T . G and G .G mismatches were repaired most efficiently; C . A, A . A, A . G and a five-base loop were repaired with intermediate efficiency; repair of G . A, C . C, and T . T mismatches was extremely inefficient. C1 UNIV SO CALIF,DEPT BIOL SCI,HEDCO MOL BIOL LABS,LOS ANGELES,CA 90089. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT BIOPHYS & BIOMOL STRUCT,BERKELEY,CA 94720. FU NIA NIH HHS [AG11398]; NIDDK NIH HHS [DK32094] NR 62 TC 15 Z9 16 U1 0 U2 0 PU SOC NEUROSCIENCE PI WASHINGTON PA 11 DUPONT CIRCLE, NW, STE 500, WASHINGTON, DC 20036 SN 0270-6474 J9 J NEUROSCI JI J. Neurosci. PD NOV 15 PY 1997 VL 17 IS 22 BP 8711 EP 8720 PG 10 WC Neurosciences SC Neurosciences & Neurology GA YE666 UT WOS:A1997YE66600007 PM 9348340 ER PT J AU Pedlowski, MA Dale, VH Matricardi, EAT da Silva, EP AF Pedlowski, MA Dale, VH Matricardi, EAT da Silva, EP TI Patterns and impacts of deforestation in Rondonia, Brazil SO LANDSCAPE AND URBAN PLANNING LA English DT Article DE tropical rain forest; land development; deforestation; Brazil ID AMAZON; MERCURY; FRONTIER; MANAGEMENT; SETTLEMENT; BASIN AB Land development in the Brazilian Amazon has gone through phases of rubber extraction, agricultural development, immigration, road expansion, and promotion of large enterprises in cattle ranching, timber extraction and mining. Land development patterns in the western state of Rondonia provide a place to focus on rapid development and its effects. The expanding land-use activities in Rondonia have resulted in an increase in the human population and the rate of deforestation so that by 1993 about 25% of the forest area had been cleared. In Rondonia the main activities responsible for the deforestation are small farmers, cattle ranchers, miners and loggers. The implications of the Rondonia Natural Resource Management Project (PLANAFLORO), which is just now being implemented, are critical to the future of the environment and economy of the region. (C) 1997 US Government. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA USA. Ambiento Estado Rondonia, Secretaria Desenvolvimento, Porto Vehlo, Rondonia, Brazil. Univ Fed Rondonia, Dept Geog, Porto Vehlo, Rondonia, Brazil. RP Dale, VH (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Matricardi, Eraldo/J-6598-2014 OI Matricardi, Eraldo/0000-0002-5323-6100 NR 37 TC 40 Z9 43 U1 1 U2 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-2046 J9 LANDSCAPE URBAN PLAN JI Landsc. Urban Plan. PD NOV 15 PY 1997 VL 38 IS 3-4 BP 149 EP 157 DI 10.1016/S0169-2046(97)00030-3 PG 9 WC Ecology; Environmental Studies; Geography; Geography, Physical; Urban Studies SC Environmental Sciences & Ecology; Geography; Physical Geography; Urban Studies GA YQ481 UT WOS:000071392100003 ER PT J AU Li, RC AF Li, RC TI Relative perturbation theory .3. More bounds on eigenvalue variation SO LINEAR ALGEBRA AND ITS APPLICATIONS LA English DT Article ID SINGULAR-VALUES; MATRICES AB Classically, the relative error in <(alpha)over tilde> = alpha(1 + delta) as an approximation to alpha is measured by delta = (relative error in <(alpha)over tilde>) = (<(alpha)over tilde> - alpha)/alpha. The quantity -log(10) \delta\ is usually used for the number of correct decimal digits in numerical results, although this delta-measure is clearly not a metric, since it lacks symmetry between alpha and <(alpha)over tilde>. In part I of this series, two other kinds of relative distances which have much better mathematical properties have been introduced and employed to establish theories, It is shown that these different measurements are topologically equivalent. However, the delta-measure is more convenient to use in practice. In this part, we established relative perturbation bounds directly using the classical measure. The new bounds for diagonalizable matrices are cleaner than the corresponding ones in part I and yield nice bounds for Hermitian matrices, too. But when applied to nonnegative definite Hermitian matrices, the new bounds are weaker than those in part I. (C) 1997 Elsevier Science Inc. RP Li, RC (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,POB 2008,BLDG 6012,OAK RIDGE,TN 37831, USA. NR 10 TC 18 Z9 19 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0024-3795 J9 LINEAR ALGEBRA APPL JI Linear Alg. Appl. PD NOV 15 PY 1997 VL 266 BP 337 EP 345 DI 10.1016/S0024-3795(97)00029-3 PG 9 WC Mathematics, Applied; Mathematics SC Mathematics GA YA279 UT WOS:A1997YA27900018 ER PT J AU Doherty, RD Hughes, DA Humphreys, FJ Jonas, JJ Jensen, DJ Kassner, ME King, WE McNelley, TR McQueen, HJ Rollett, AD AF Doherty, RD Hughes, DA Humphreys, FJ Jonas, JJ Jensen, DJ Kassner, ME King, WE McNelley, TR McQueen, HJ Rollett, AD TI Current issues in recrystallization: a review SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Review DE As-deformed state; nucleation; recrystallization ID BOUNDARY-CHARACTER-DISTRIBUTION; ALUMINUM SINGLE-CRYSTALS; LARGE-STRAIN DEFORMATION; GEOMETRIC-DYNAMIC-RECRYSTALLIZATION; ENERGY-DISSIPATION EFFICIENCY; MODELING TEXTURE CHANGE; HIGH-PURITY ALUMINUM; IN-SITU OBSERVATION; GRAIN-BOUNDARIES; MICROSTRUCTURAL EVOLUTION AB The current understanding of the fundamentals of recrystallization is summarized. This includes understanding the as-deformed state. Several aspects of recrystallization are described: nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recrystallization, particle effects, and texture. This article is authored by the leading experts in these areas. The subjects are discussed individually and recommendations for further study are listed in the final section. (C) 1997 Elsevier Science S.A. C1 Oregon State Univ, Dept Mech Engn, Corvallis, OR 97331 USA. Drexel Univ, Dept Mat Engn, Philadelphia, PA 19104 USA. Sandia Natl Labs, Ctr Mat & Appl Mech, Livermore, CA 94550 USA. Univ Manchester, Manchester Mat Sci Ctr, Manchester M1 7H5, Lancs, England. Univ Manchester, Manchester M1 7H5, Lancs, England. McGill Univ, Dept Engn Met, Quebec City, PQ H3A 2A7, Canada. Riso Natl Lab, Dept Mat, DK-4000 Roskilde, Denmark. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. USN, Postgrad Sch, Dept Mech Engn, Monterey, CA 93943 USA. Concordia Univ, Dept Mech Engn, Montreal, PQ 63G 1M8, Canada. Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA. RP Oregon State Univ, Dept Mech Engn, Corvallis, OR 97331 USA. EM kassner@engr.orst.edu RI Jonas, John/A-2773-2008; LAI, JING/F-6526-2010; Rollett, Anthony/A-4096-2012; OI Jonas, John/0000-0001-7291-6673; Rollett, Anthony/0000-0003-4445-2191; Juul Jensen, Dorte/0000-0001-5096-6602 NR 366 TC 1022 Z9 1086 U1 47 U2 349 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 EI 1873-4936 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 15 PY 1997 VL 238 IS 2 BP 219 EP 274 DI 10.1016/S0921-5093(97)00424-3 PG 56 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV826 UT WOS:000071867200001 ER PT J AU Wright, JK Williamson, RL Cannon, RM AF Wright, JK Williamson, RL Cannon, RM TI Finite element analysis of the effects of corners on residual stresses in protective oxide scales (vol 230, pg 202, 1997) SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Correction DE finite element analysis; protective oxide scales; residual stress ID METAL; INTERFACE; CRACKING; GROWTH; MECHANICS; JOINTS; ALLOYS; FILMS AB Finite element simulations are used to examine residual thermal stresses and strains in corner regions of protective Al2O3 scales on Fe3Al specimens, both during cooling from oxide formation temperatures and during subsequent thermal cycling. The effects of a corner's radius of curvature and oxide thickness, as well as the impact of aluminide plasticity, are considered. Localized plasticity is found to have a major influence on net deformation and on the magnitude and location of maximum stress. As the ratio of corner curvature to oxide thickness (r(s)/t) is reduced, stresses within the oxide corner shift from highly compressive to tensile and the location of the maximum principal stress moves from the substrate to the oxide scale. Based on these stress distributions prior to the development of any flaws, key implications about the tendencies for damage are addressed. The stress evolution during cooling and thermal cycling is presented; these results demonstrate the effects of temperature-dependent material properties. For the material behavior assumed in this study, thermal cycling does not cause significant stress relaxation. (C) 1997 Elsevier Science S.A. C1 Idaho Natl Engn Lab, Idaho Falls, ID 83415 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Wright, JK (reprint author), Idaho Natl Engn Lab, POB 1625, Idaho Falls, ID 83415 USA. NR 23 TC 7 Z9 7 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 15 PY 1997 VL 238 IS 2 BP 411 EP 421 PG 11 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YV826 UT WOS:000071867200018 ER PT J AU Dalgaard, JZ Klar, AJ Moser, MJ Holley, WR Chatterjee, A Mian, IS AF Dalgaard, JZ Klar, AJ Moser, MJ Holley, WR Chatterjee, A Mian, IS TI Statistical modeling and analysis of the LAGLIDADG family of site-specific endonucleases and identification of an intein that encodes a site-specific endonuclease of the HNH family SO NUCLEIC ACIDS RESEARCH LA English DT Article ID GROUP-I INTRON; HIDDEN MARKOV-MODELS; RIBOSOMAL-RNA GENE; YEAST MITOCHONDRIAL-DNA; PI-SCEI ENDONUCLEASE; SACCHAROMYCES-CEREVISIAE; PYROBACULUM-ORGANOTROPHUM; INTERVENING SEQUENCES; SPEECH RECOGNITION; ESCHERICHIA-COLI AB The LAGLIDADG and HNH families of site-specific DNA endonucleases encoded by viruses, bacteriophages as well as archaeal, eucaryotic nuclear and organellar genomes are characterized by the sequence motifs 'LAGLIDADG' and 'HNH', respectively, These endonucleases have been shown to occur in different environments: LAGILIDADG endonucleases are found in inteins, archaeal and group I introns and as free standing open reading frames (ORFs); HNH endonucleases occur in group I and group II introns and as ORFs, Here, statistical models (hidden Markov models, HMMs) that encompass both the conserved motifs and more variable regions of these families have been created and employed to characterize known and potential new family members, A number of new, putative LAGLIDADG and HNH endonucleases have been identified including an intein-encoded HNH sequence. Analysis of an HMM-generated multiple alignment of 130 LAGLIDADG family members and the th ree-dimensional structure of the I-CreI endonuclease has enabled definition of the core elements of the repeated domain (similar to 90 residues) that is present in this family of proteins, A conserved negatively charged residue is proposed to be involved in catalysis, Phylogenetic analysis of the two families indicates a lack of exchange of endonucleases between different mobile elements (environments) and between hosts from different phylogenetic kingdoms, However, there does appear to have been considerable exchange of endonuclease domains amongst elements of the same type, Such events are suggested to be important for the formation of elements of new specficity. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV LIFE SCI, BERKELEY, CA 94720 USA. RP NCI, FREDERICK CANC RES & DEV CTR, ABL BASIC RES PROGRAM,POB B,BLDG 549, ROOM 154, FREDERICK, MD 21702 USA. NR 85 TC 153 Z9 156 U1 1 U2 4 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 EI 1362-4962 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD NOV 15 PY 1997 VL 25 IS 22 BP 4626 EP 4638 DI 10.1093/nar/25.22.4626 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YJ405 UT WOS:A1997YJ40500027 PM 9358175 ER PT J AU Hankla, AK Bullock, AB White, WE Squier, JA Barty, CPJ AF Hankla, AK Bullock, AB White, WE Squier, JA Barty, CPJ TI Tunable short-pulse beat-wave laser source operating at 1 mu m SO OPTICS LETTERS LA English DT Article ID ACCELERATION; ELECTRONS AB We have demonstrated a chirped-pulse-amplification system utilizing an air-spaced etalon inside a regenerative amplifier to produce two simultaneous 2.0-ps pulses, one centered at the gain peak of Nd:phosphate glass (1052 nm) and the other centered at the gain peak of Nd:silicate (1061 nm). Autocorrelations of the resulting beat wave demonstrate a beat frequency of 2.3 THz. We achieved wavelength tunability over a 10-nm range by electronically adjusting the etalon spacing and variable pulse width by changing the etalon rotation. (C) 1997 Optical Society of America. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP Hankla, AK (reprint author), POSIT LIGHT INC,103 COOPER COURT,LOS GATOS,CA 95030, USA. NR 8 TC 4 Z9 4 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 15 PY 1997 VL 22 IS 22 BP 1713 EP 1715 DI 10.1364/OL.22.001713 PG 3 WC Optics SC Optics GA YF194 UT WOS:A1997YF19400018 PM 18188344 ER PT J AU Morozov, N Zeldov, E Konczykowski, M Doyle, RA AF Morozov, N Zeldov, E Konczykowski, M Doyle, RA TI Geometrical and distributed surface barriers in Bi2Sr2CaCu2O8 SO PHYSICA C LA English DT Article DE vortex dynamics; surface barrier; geometry effect; magnetic susceptibility ID HIGH-TEMPERATURE SUPERCONDUCTORS; PERPENDICULAR MAGNETIC-FIELD; HIGH-TC SUPERCONDUCTORS; IRREVERSIBILITY LINE; II SUPERCONDUCTORS; AC SUSCEPTIBILITY; FLAT SUPERCONDUCTORS; TRANSPORT CURRENTS; SINGLE-CRYSTALS; FLUX-CREEP AB The local ac magnetic response in Bi2Sr2CaCu2O8 crystals of platelet and prism shapes has been measured using microscopic arrays of Hall sensors. At elevated temperatures the ac response in platelet samples is governed by the geometrical barrier whereas a distributed Bean-Livingston surface barrier is dominant for the prism-shaped sample. In the local measurements these two barriers display qualitatively different behavior and can be individually studied. Models for the local ac response are derived for the two cases and good agreement with experiment is obtained. (C) 1997 Elsevier Science B.V. C1 Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel. Ecole Polytech, Solides Irradies Lab, CNRS, URA 1380, F-91128 Palaiseau, France. Univ Cambridge, Interdisciplinary Res Ctr Superconduct, Cambridge CB3 0HE, England. RP Morozov, N (reprint author), Univ Calif Los Alamos Natl Lab, Superconduct Technol Ctr, K763, Los Alamos, NM 87545 USA. RI Zeldov, Eli/K-1546-2012 OI Zeldov, Eli/0000-0002-8200-4974 NR 53 TC 49 Z9 51 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 15 PY 1997 VL 291 IS 1-2 BP 113 EP 131 DI 10.1016/S0921-4534(97)01666-3 PG 19 WC Physics, Applied SC Physics GA YN725 UT WOS:000071199600016 ER PT J AU Reichertz, LA Dubon, OD Sirmain, G Brundermann, E Hansen, WL Chamberlin, DR Linhart, AM Roser, HP Haller, EE AF Reichertz, LA Dubon, OD Sirmain, G Brundermann, E Hansen, WL Chamberlin, DR Linhart, AM Roser, HP Haller, EE TI Stimulated far-infrared emission from combined cyclotron resonances in germanium SO PHYSICAL REVIEW B LA English DT Article ID P-GE; MAGNETIC-FIELDS; LASER; STATES; HOLES AB We have measured the spectrum of stimulated far-infrared emission from Be-and Zn-doped germanium single crystals in crossed electric and magnetic fields. The spectrum consists of broad radiation bands in the frequency range of 40 - 130 cm(-1) that are due to intervalence band transitions and new narrow emission bands with their center frequencies rising Linearly with magnetic field. We demonstrate that the latter emission is due to cyclotron resonance hole transitions between Landau levels of the light-hole subband accompanied by simultaneous spin flip, ''combined resonances.'' C1 DLR,INST SPACE SENSOR TECHNOL,D-12489 BERLIN,GERMANY. RP Reichertz, LA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720, USA. RI Bruendermann, Erik/J-7186-2016 OI Bruendermann, Erik/0000-0003-4119-3489 NR 24 TC 24 Z9 24 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12069 EP 12072 DI 10.1103/PhysRevB.56.12069 PG 4 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500010 ER PT J AU Michihiro, Y Mahan, GD AF Michihiro, Y Mahan, GD TI Shielding factors of ions in rock-salt crystals SO PHYSICAL REVIEW B LA English DT Article AB The calculation of the quadrupole shielding factor of closed-shell ions in crystalline solids with rock-salt structure is done based on the self-consistent-field local-density approximation, modified Sternheimer equation, and spherical solid model. A significant reduction of the values of the quadrupole shielding factor is found for the anions, and the amount of the reduction is different in different crystals. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. NR 22 TC 8 Z9 8 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12151 EP 12153 DI 10.1103/PhysRevB.56.12151 PG 3 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500031 ER PT J AU Zambetaki, I Li, QM Economou, EN Soukoulis, CM AF Zambetaki, I Li, QM Economou, EN Soukoulis, CM TI Localization in weakly coupled planes and weakly coupled wires SO PHYSICAL REVIEW B LA English DT Article ID C-AXIS TRANSPORT; ANDERSON LOCALIZATION; ANISOTROPIC SYSTEMS; METAL-ALLOYS; MODEL; TRANSMISSION; CONDUCTIVITY; TRANSITION; STATES; MEDIA AB We investigate the localization behavior of the Anderson model with anisotropic hopping integral t for weakly coupled planes and weakly coupled chains both numerically with the transfer matrix method and analytically within the self-consistent theory of localization. It is found that the mobility edge is independent of the propagating direction. However, the correlation xi (localization L-c) length in the extended (localized) side of the transition can be very different for the two directions. We find that xi(parallel to) = t(2) xi(perpendicular to) and L-c(perpendicular to) = tL(c)(parallel to), in agreement with the scaling theory of localization. We discuss how this can possibly explain the transport properties of high-T-c materials. The critical disorder W-c is found to vary as t(1/4) for weakly coupled planes and as t(1/2) for weakly coupled chains. A discrepancy with the predictions of a diagrammatic analysis on the conductance ratio is discussed. C1 DEPT PHYS,IRAKLION 71110,CRETE,GREECE. IOWA STATE UNIV,AMES LAB,AMES,IA 50011. IOWA STATE UNIV,DEPT PHYS & ASTRON,AMES,IA 50011. RP Zambetaki, I (reprint author), RES CTR CRETE,POB 1527,IRAKLION 71110,CRETE,GREECE. RI Economou, Eleftherios /E-6374-2010; Soukoulis, Costas/A-5295-2008 NR 36 TC 5 Z9 5 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12221 EP 12231 DI 10.1103/PhysRevB.56.12221 PG 11 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500042 ER PT J AU McMahan, AK Klepeis, JE AF McMahan, AK Klepeis, JE TI Direct calculation of Slater-Koster parameters: Fourfold-coordinated silicon/boron phases SO PHYSICAL REVIEW B LA English DT Article ID TIGHT-BINDING PARAMETERS; FUNCTIONAL-BASED CONSTRUCTION; TOTAL-ENERGY; ATOMIC ORBITALS; SI; POTENTIALS; MODELS AB The need for tight-binding total-energy representations of interatomic forces has renewed interest in Slater-Koster parametrization of electron band structure. For larger numbers of parameters, as in multicomponent systems, and to truly test issues of transferability, it is advantageous to have means of directly calculating these parameters. Here we derive analytic expressions for the two-center Slater-Roster hopping parameters, effective site energies, and effective crystal-field parameters in terms of the one-electron Hamiltonian matrix elements in any localized minimal basis, and analogous quantities for the overlap. We apply these expressions to the cubic diamond phases of Si and B, and the zinc-blende phase of SiB at three volumes each, using spd, nonorthogonal full potential linear muffin-tin orbital matrix elements calculated with a linked or contracted minimal basis. RP McMahan, AK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 38 TC 12 Z9 12 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 NOV 15 PY 1997 VL 56 IS 19 BP 12250 EP 12262 DI 10.1103/PhysRevB.56.12250 PG 13 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500046 ER PT J AU Wang, LW Zunger, A AF Wang, LW Zunger, A TI Magnitude and size scaling of intervalley coupling in semiconductor alloys and superlattices SO PHYSICAL REVIEW B LA English DT Article ID INAS/GAAS QUANTUM DOTS; ELECTRONIC-STRUCTURE; HIGH-PRESSURE; PSEUDOPOTENTIALS; TRANSITION; ALXGA1-XAS; CROSSOVER AB Coupling between different Gamma, X, and L band-structure valleys is responsible for (a) level anticrossing in superlattices as a function of period, pressure, and electric field and for (b) ''optical bowing'' of band gaps in random alloys. We investigate the symmetry, magnitude, and size scaling of intervalley coupling in semiconductor superlattices and alloys by direct supercell calculations, performed with screened pseudopotentials and a plane-wave basis, considering up to 10(6) atoms/supercell. Projecting the calculated electronic wave functions psi(i) of alloys or superlattices onto the bulk states of the constituent zinc-blende materials shows that psi(i) contain a ''majority representation'' from one or more zinc-blende states gamma. The intervalley coupling E(i,j) between the alloy states psi(i) and psi(j) then includes a term 2F(gamma, gamma')V(gamma, gamma') due to the ''majority representations'' gamma and gamma' of psi(i) and psi j, respectively, plus residual terms due to the minority representations. We find the following: (i) In alloys, the orbital overlap function F(gamma,gamma') is large, since the wave functions are extended. The intervalley coupling element V(gamma, gamma') exhibits simple selection rules. being zero for (Gamma(1c),X-1c), (Gamma(1c),L-3c), (X-1c(x),X-1c(y)), etc. (''weak coupling''), and nonzero for (Gamma(1c), X-3c), (Gamma(1c),L-1c), (L-3c,X-1c), etc. (''strong coupling''). This explains why the <(Gamma)over bar>-like conduction band of mixed-cation alloys contains zinc-blende Gamma(1c) and L-1c character, but not X-1c. in the case of strong coupling, E(i,j) scales as 1/root Omega, where Omega is the volume, while in the weak-coupling case the entire coupling originates from the ''minority representation,'' and is 20-100 times smaller. The minority representation, however, contributes to the bowing of the band gap vs composition. (ii) In superlattices, although the above selection rule for V(gamma, gamma') still exists, the magnitude of the intervalley coupling is governed by the overlap function F(gamma, gamma'). For simple superlattices, F(gamma, gamma') is small, since the wave functions are localized in particular segments (''weak coupling''). Consequently, the ''majority representation'' contributes 5-100 times less than in the analogous case of alloys. Furthermore, E(i,j) scales as 1/n(3), where n is the superlattice period. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 31 TC 22 Z9 22 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12395 EP 12403 DI 10.1103/PhysRevB.56.12395 PG 9 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500064 ER PT J AU Sitko, P Yi, KS Quinn, JJ AF Sitko, P Yi, KS Quinn, JJ TI Composite fermion hierarchy: Condensed states of composite fermion excitations SO PHYSICAL REVIEW B LA English DT Article ID INCOMPRESSIBLE QUANTUM FLUID; HALL SYSTEMS; SPECTRA AB A composite fermion hierarchy theory is constructed in a way related to the original Haldane picture by applying the composite fermion (CF) transformation to quasiparticles of Jain states. It is shown that the Jain theory coincides with the Haldane hierarchy theory for principal CF fillings. Within the Fermi liquid approach for few-electron systems on the sphere, a simple interpretation of many-quasiparticle spectra is given, and provides an explanation of failure of CF hierarchy picture when applied to the hierarchical 4/11 state. C1 WROCLAW TECH UNIV,INST PHYS,PL-50370 WROCLAW,POLAND. PUSAN NATL UNIV,PUSAN 609735,SOUTH KOREA. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP Sitko, P (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 14 TC 45 Z9 45 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12417 EP 12421 DI 10.1103/PhysRevB.56.12417 PG 5 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500067 ER PT J AU Xiao, XD Xie, YL Jakobsen, C Shen, YR AF Xiao, XD Xie, YL Jakobsen, C Shen, YR TI Effects of surface impurities on surface diffusion of CO on Ni(110) SO PHYSICAL REVIEW B LA English DT Article ID INDUCED THERMAL-DESORPTION; ELECTRONIC-STRUCTURE; HETEROGENEOUS CATALYSIS; ADSORBATE INTERACTIONS; SELF-DIFFUSION; ADSORPTION; PT(111); NI(100); HYDROGEN; SULFUR AB A small amount of coadsorbed impurity species could significantly alter the surface diffusion of CO on Ni(110). Three impurity species, sulfur, oxygen, and potassium are studied here. The former two are known as ''poisons'' and the latter as a ''promoter'' for CO hydrogenation on Ni. All three are found to impede CO diffusion drastically. The apparent diffusion activation energy E-D increases from the clean-surface Value of 2-3 kcal/mol, to a saturation value of 7-8 kcal/mol at sufficiently high impurity-coverages. The impeding effect decreases from S to O to K. Mechanisms responsible for the effect are discussed in detail. With S and O, the impurity-covered step-controlled diffusion appears to be the dominant mechanism. With K, the nearest-neighbor attractive interaction between CO and K seems to be most important. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720. RP Xiao, XD (reprint author), HONG KONG UNIV SCI & TECHNOL,DEPT PHYS,HONG KONG,HONG KONG. NR 58 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 19 BP 12529 EP 12538 DI 10.1103/PhysRevB.56.12529 PG 10 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500081 ER PT J AU Li, YG Bartelt, MC Evans, JW Waelchli, N Kampshoff, E Kern, K AF Li, YG Bartelt, MC Evans, JW Waelchli, N Kampshoff, E Kern, K TI Transition from one- to two-dimensional island growth on metal (110) surfaces induced by anisotropic corner rounding SO PHYSICAL REVIEW B LA English DT Article ID DIFFUSION-LIMITED AGGREGATION; MOLECULAR-BEAM EPITAXY; 2-DIMENSIONAL ISLANDS; DENDRITIC GROWTH; SI; SI(001); NUCLEATION; HOMOEPITAXY; MECHANISM; PD(110) AB We propose a kinetic model to describe the temperature dependence of the shape of islands formed during submonolayer epitaxy on anisotropic metal surfaces. Our model reveals that ''anisotropic corner rounding'' is the key atomic process responsible for a transition in island shape, from chain structures at lower temperatures, to compact islands at higher temperatures. Exploiting data for the temperature and flux scaling of the island density, we analyze such behavior observed experimentally in Cu/Pd(110) epitaxy, estimating activation barriers of 0.45 and 0.3 eV for anisotropic terrace diffusion, and 0.65 eV for the slow corner-rounding process. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,IPRT,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. ECOLE POLYTECH FED LAUSANNE,INST PHYS EXPT,CH-1015 LAUSANNE,SWITZERLAND. NR 30 TC 45 Z9 45 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 NOV 15 PY 1997 VL 56 IS 19 BP 12539 EP 12543 DI 10.1103/PhysRevB.56.12539 PG 5 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500082 ER PT J AU Claessen, R Wilde, C Reinert, F Hufner, S Gweon, GH Allen, JW Poirier, DM Olson, CG AF Claessen, R Wilde, C Reinert, F Hufner, S Gweon, GH Allen, JW Poirier, DM Olson, CG TI Temperature dependence of electronic states in (TaSe4)(2)I - Comment SO PHYSICAL REVIEW B LA English DT Editorial Material ID ONE-DIMENSIONAL METALS; PHOTOEMISSION; TRANSITION AB In a recent photoemission study on the quasi-one-dimensional Peierls system (TaSe4)(2)I Terrasi et al. [Phys. Rev. B 52, 5592 (1995)] report, that two (rather than one) anticyclic dispersing conduction bands exist in this material, each of them observable for a different Light polarization relative to the direction of the conducting axis and each displaying a periodicity consistent with the charge-density wave vector. Our own angle-resolved photoemission data do not confirm these observations. C1 UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP Claessen, R (reprint author), UNIV SAARLAND,FACHRICHTUNG EXPT PHYS,D-66041 SAARBRUCKEN,GERMANY. RI Reinert, Friedrich/J-3005-2013; Claessen, Ralph/A-2045-2017 OI Claessen, Ralph/0000-0003-3682-6325 NR 18 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 NOV 15 PY 1997 VL 56 IS 19 BP 12643 EP 12646 DI 10.1103/PhysRevB.56.12643 PG 4 WC Physics, Condensed Matter SC Physics GA YH165 UT WOS:A1997YH16500094 ER PT J AU Remes, Z Vanecek, M Mahan, AH Crandall, RS AF Remes, Z Vanecek, M Mahan, AH Crandall, RS TI Silicon network relaxation in amorphous hydrogenated silicon SO PHYSICAL REVIEW B LA English DT Article ID A-SI-H; OPTICAL-CONSTANTS; DENSITY; FILMS AB We have investigated nanovoid-free, low-defect-density, amorphous hydrogenated silicon, a-Si:H, with variable hydrogen content. We have observed reconstruction of all silicon-silicon bonds at temperatures as low as 430 degrees C, well below the crystallization temperature. This bond reconstruction leads to a decrease in thin-film thickness and an increase in material density, about 3% for the material with 9 at. % of hydrogen, during slow hydrogen outdiffusion. These results suggest that a long-range structural rearrangement of the silicon network can occur simultaneously with hydrogen motion and this has important consequences for all metastability models in amorphous hydrogenated silicon. C1 NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RP Remes, Z (reprint author), ACAD SCI CZECH REPUBL, INST PHYS, CUKROVARNICKA 10, CZ-16253 PRAGUE 6, CZECH REPUBLIC. RI Remes, Zdenek/G-9420-2014; Vanecek, Milan/H-1995-2014 OI Remes, Zdenek/0000-0002-3512-9256; NR 23 TC 54 Z9 54 U1 0 U2 5 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 NOV 15 PY 1997 VL 56 IS 20 BP 12710 EP 12713 PG 4 WC Physics, Condensed Matter SC Physics GA YH588 UT WOS:A1997YH58800008 ER PT J AU Nicholson, DMC Zhang, XG AF Nicholson, DMC Zhang, XG TI Approximate occupation functions for density-functional calculations SO PHYSICAL REVIEW B LA English DT Article ID ENERGY AB The density-functional free energy can be written in a form that is stationary with respect to variations in the occupation function. For this reason it is useful to look for approximate occupation functions that are sufficiently close to the Fermi function that accuracy is not compromised and yet have advantages for computation. From a computational point of view it is useful to reduce the number of poles of the occupation function in the upper half of the complex energy plane and to locate the poles as far from the real axis as possible. A family of approximate occupation functions that economize computation is introduced. Their properties are discussed and illustrated for a model system. RP Nicholson, DMC (reprint author), OAK RIDGE NATL LAB,COMPUTAT PHYS & ENGN DIV,OAK RIDGE,TN 37831, USA. NR 10 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 20 BP 12805 EP 12810 DI 10.1103/PhysRevB.56.12805 PG 6 WC Physics, Condensed Matter SC Physics GA YH588 UT WOS:A1997YH58800031 ER PT J AU Harrison, N Mielke, CH Rickel, DG Montgomery, LK Burgin, T AF Harrison, N Mielke, CH Rickel, DG Montgomery, LK Burgin, T TI De Haas-van Alphen effect in the organic metal kappa-(BEDT-TSF)(2)Cu[N(CN)(2)]Br: Crossover to two-dimensional behavior in the complete-breakdown regime SO PHYSICAL REVIEW B LA English DT Article ID HIGH MAGNETIC-FIELDS; QUANTUM OSCILLATIONS; AMBIENT-PRESSURE; SUPERCONDUCTOR; CONDUCTORS; SALTS AB de Haas-van Alphen measurements are reported in the organic metal kappa-(BEDT-TSF)(2)Cu[N(CN)(2)]Br, which is the structural analog of the highest T-c (BEDT-TTF) salt. The frequencies are consistent with the calculated Fermi surface in the complete magnetic breakdown regime, with the warped structure manifesting itself as beats in the oscillations. Above the final node at similar to 38.5 T, the oscillations become characteristic of a two-dimensional metal. C1 INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. RP Harrison, N (reprint author), LOS ALAMOS NATL LAB,NATL HIGH MAGNET FIELD LAB,MAILSTOP E536,LOS ALAMOS,NM 87545, USA. RI Mielke, Charles/S-6827-2016 OI Mielke, Charles/0000-0002-2096-5411 NR 17 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 20 BP 12905 EP 12908 DI 10.1103/PhysRevB.56.12905 PG 4 WC Physics, Condensed Matter SC Physics GA YH588 UT WOS:A1997YH58800043 ER PT J AU Alsina, F Cheong, HM Webb, JD Mascarenhas, A Geisz, JF Olson, JM AF Alsina, F Cheong, HM Webb, JD Mascarenhas, A Geisz, JF Olson, JM TI Far-infrared reflection studies in ordered GaInP2 SO PHYSICAL REVIEW B LA English DT Article ID VAPOR-PHASE EPITAXY; RAMAN-SCATTERING; PHOTOLUMINESCENCE; MODES AB We report on room-temperature polarized far-infrared reflectance in partially ordered GaInP performed with the incidence plane parallel to the growth and ordering directions. Measurements in the s-polarization geometry show only one feature related to the vibrations in the plane of ordering. On the contrary, those performed using p polarization display a structure appearing in the range of InP-like vibrations as the order parameter increases, which we relate to a resonance with longitudinal-optic mode character due to the anisotropy of the longitudinal phonons. RP Alsina, F (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Alzina, Francesc/C-5468-2008; Cheong, Hyeonsik/D-7424-2012 OI Alzina, Francesc/0000-0002-7082-0624; Cheong, Hyeonsik/0000-0002-2347-4044 NR 24 TC 13 Z9 14 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 20 BP 13126 EP 13131 DI 10.1103/PhysRevB.56.13126 PG 6 WC Physics, Condensed Matter SC Physics GA YH588 UT WOS:A1997YH58800067 ER PT J AU Pankratov, O Huang, HC delaRubia, TD Mailhiot, C AF Pankratov, O Huang, HC delaRubia, TD Mailhiot, C TI As-vacancy interaction and ring mechanism of diffusion in Si SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; SILICON AB Vacancy-mediated diffusion of substitutional impurities in Si drastically depends on the character of the impurity-vacancy interaction. The attractive interaction which extends to at least the third nearest neighbors allows a vacancy to move along a ring of Si sites around the impurity. This process enables the impurity-vacancy pair to move and underlies the ''ring mechanism'' of diffusion. To evaluate the importance of this mechanism for As impurity in Si we performed density functional calculations of the As-vacancy interaction. We also calculated the vacancy migration barriers on the circular path around the impurity. The binding energy of the As-V pair was found to be 1.17 eV. This energy decreases down to 0.36 eV when the vacancy moves onto the third-nearest-neighbor site, which is the most remote site on the ring path. We found that the migration barriers for the vacancy hops around the impurity are an order of magnitude smaller than in a bulk Si. The effective barrier alone the ring path is therefore mostly determined by the difference of the binding energies on the first-and the third-nearest-neighbor sites and was found to be about 0.81 eV, in a fairly good agreement with experiment. Using ab initio binding energies and migration barriers we carried out the Monte Carlo simulation of As diffusion in silicon. We found that in a temperature range between 700 K and 1300 K the vacancy-assisted As diffusion is totally dominated by the ring mechanism. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RI Huang, Hanchen/A-9323-2008; Pankratov, Oleg/C-5553-2013 NR 12 TC 52 Z9 52 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1997 VL 56 IS 20 BP 13172 EP 13176 DI 10.1103/PhysRevB.56.13172 PG 5 WC Physics, Condensed Matter SC Physics GA YH588 UT WOS:A1997YH58800074 ER PT J AU Chung, DJH Farrar, GR Kolb, EW AF Chung, DJH Farrar, GR Kolb, EW TI Relic abundance of light photinos SO PHYSICAL REVIEW D LA English DT Article ID NEUTRALINO DARK MATTER; CROSS-SECTIONS; PARTICLES; GLUINO; MASSES; CANDIDATES; GAUGINO AB We solve the coupled Boltzmann equation for the system of light photinos interacting with pions and R-0's (the gluon-gluino bound state) to determine the relic abundance of light photinos in the light gaugino scenario. Cosmology bounds the ratio r of the R-0 mass to the <(gamma)over tilde> mass to be less than about 1.8. We also use a model Lagrangian embodying crossing symmetry between the R-0<-><(gamma)over tilde>pi pi and R-0 pi<-><(gamma)over tilde>pi reactions to identify cosmologically favored regions of R-0 lifetime as a function of R-0 and <(gamma)over tilde> masses. [S0556-2821(97)07322-0]. C1 UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP Chung, DJH (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. NR 30 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 NOV 15 PY 1997 VL 56 IS 10 BP 6096 EP 6106 DI 10.1103/PhysRevD.56.6096 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH166 UT WOS:A1997YH16600008 ER PT J AU Kolb, EW Riotto, A Tkachev, II AF Kolb, EW Riotto, A Tkachev, II TI Evolution of the order parameter after bubble collisions SO PHYSICAL REVIEW D LA English DT Article ID PHASE-TRANSITIONS; PARTICLE-PRODUCTION; INFLATION; BARYOGENESIS; UNIVERSE AB If a first-order phase transition is terminated by percolation and collisions of new-phase bubbles, there will exist a period of nonequilibrium between the time bubbles collide and the time thermal equilibrium is established. We study the behavior of the order parameter during this phase. We find that large nonthermal fluctuations at this stage reduce the order parameter below its eventual thermal equilibrium value. We comment on possible consequences for electroweak baryogenesis. [S0556-2821(97)04422-6]. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117312,RUSSIA. RP Kolb, EW (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,POB 500,BATAVIA,IL 60510, USA. NR 22 TC 11 Z9 11 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 NOV 15 PY 1997 VL 56 IS 10 BP 6133 EP 6138 DI 10.1103/PhysRevD.56.6133 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH166 UT WOS:A1997YH16600013 ER PT J AU MolinaParis, C Visser, M AF MolinaParis, C Visser, M TI Casimir effect in dielectrics: Surface area contribution SO PHYSICAL REVIEW D LA English DT Article ID WAVE EQUATION; FINITE DOMAIN; LIGHT; ENERGY; EIGENFREQUENCIES; FIELD AB In this paper we rake a deeper look at the technically elementary but physically robust viewpoint in which the Casimir energy in dielectric media is interpreted as the change in the total zero-point energy of the electromagnetic vacuum summed over all states. Extending results presented in previous papers we approximate the sum over stares by an integral over the density of states including finite volume corrections. For an arbitrarily shaped finite dielectric, the first finite-volume correction to the density of states is shown to be proportional to the surface area of the dielectric interface and is explicitly evaluated as a function of the permeability and permitivity. Since these calculations are founded in an elementary and straightforward way on the underlying physics of the Casimir effect they serve as an important consistency check on field-theoretic calculations. As a concrete example we discuss Schwinger's suggestion that the Casimir effect might be the underlying physical basis behind sonoluminescence. The recent controversy concerning the relative importance of volume and surface contributions is discussed. For sufficiently large bubbles the volume effect is always dominant. Furthermore we can explicitly calculate the surface area contribution as a function of refractive index. [S0556-2821(97)00922-3]. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. RP MolinaParis, C (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Visser, Matt/0000-0003-1088-6485 NR 25 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 15 PY 1997 VL 56 IS 10 BP 6629 EP 6639 DI 10.1103/PhysRevD.56.6629 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YH166 UT WOS:A1997YH16600062 ER PT J AU Fu, CL Yoo, MH AF Fu, CL Yoo, MH TI Interfacial energies in two-phase TiAl-Ti3Al alloy SO SCRIPTA MATERIALIA LA English DT Article ID POLYSYNTHETICALLY TWINNED CRYSTALS; PLANAR FAULT ENERGIES; LAMELLAR STRUCTURE; FRACTURE-BEHAVIOR; ELASTIC-CONSTANTS; DEFORMATION; TI3AL; AL RP Fu, CL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 37 Z9 38 U1 2 U2 15 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD NOV 15 PY 1997 VL 37 IS 10 BP 1453 EP 1459 DI 10.1016/S1359-6462(97)00313-8 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YC290 UT WOS:A1997YC29000002 ER PT J AU Russell, AM Cook, BA AF Russell, AM Cook, BA TI Coefficient of thermal expansion anisotropy and texture effects in ultra-thin titanium sheet SO SCRIPTA MATERIALIA LA English DT Article RP Russell, AM (reprint author), IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011, USA. OI Russell, Alan/0000-0001-5264-0104 NR 13 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD NOV 15 PY 1997 VL 37 IS 10 BP 1461 EP 1467 DI 10.1016/S1359-6462(97)00312-6 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YC290 UT WOS:A1997YC29000003 ER PT J AU Carson, L Chumbley, LS AF Carson, L Chumbley, LS TI The deposition of chromium by the use of an inductively-coupled radio-frequency plasma torch SO SCRIPTA MATERIALIA LA English DT Article RP Carson, L (reprint author), IOWA STATE UNIV,AMES LAB,214 WILHELM,AMES,IA 50014, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD NOV 15 PY 1997 VL 37 IS 10 BP 1531 EP 1538 DI 10.1016/S1359-6462(97)00292-3 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YC290 UT WOS:A1997YC29000013 ER PT J AU Wang, JN Nieh, TG AF Wang, JN Nieh, TG TI Effect of minor Sz addition on the creep of a fully lamellar TiAl alloy SO SCRIPTA MATERIALIA LA English DT Article ID TITANIUM ALUMINIDE; DEFORMATION RP Wang, JN (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-369,LIVERMORE,CA 94550, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 18 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD NOV 15 PY 1997 VL 37 IS 10 BP 1545 EP 1550 DI 10.1016/S1359-6462(97)00281-9 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YC290 UT WOS:A1997YC29000015 ER PT J AU Peralta, P Maloy, SA Chu, F Petrovic, JJ Mitchell, TE AF Peralta, P Maloy, SA Chu, F Petrovic, JJ Mitchell, TE TI Mechanical properties of monocrystalline C11(b) MoSi2 with small aluminum additions SO SCRIPTA MATERIALIA LA English DT Article ID SINGLE-CRYSTALS RP Peralta, P (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Maloy, Stuart/A-8672-2009 OI Maloy, Stuart/0000-0001-8037-1319 NR 13 TC 32 Z9 33 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD NOV 15 PY 1997 VL 37 IS 10 BP 1599 EP 1604 DI 10.1016/S1359-6462(97)00280-7 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA YC290 UT WOS:A1997YC29000022 ER PT J AU Vincent, JM Rabion, A Yachandra, VK Fish, RH AF Vincent, JM Rabion, A Yachandra, VK Fish, RH TI Fluorous biphasic catalysis: Complexation of 1,4,7-[C8F17(CH2)(3)](3)-1,4,7-triazacyclononane with [M(C8F17(CH2)(2)CO2)(2)] (M = Mn, Co) to provide perfluoroheptane-soluble catalysts for alkane and alkene functionalization in the presence of t-BuOOH and O-2 SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article DE biphasic catalysis; cobalt; fluorohydrocarbons; manganese; oxidations ID OXIDATION; WATER C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. GRP RECH LACQ,F-64170 ARTIX,FRANCE. NR 16 TC 134 Z9 134 U1 2 U2 10 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 10 11 61, D-69451 WEINHEIM, GERMANY SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD NOV 14 PY 1997 VL 36 IS 21 BP 2346 EP 2349 DI 10.1002/anie.199723461 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA YH944 UT WOS:A1997YH94400015 ER PT J AU Song, YQ Goodson, BM Taylor, RE Laws, DD Navon, G Pines, A AF Song, YQ Goodson, BM Taylor, RE Laws, DD Navon, G Pines, A TI Selective enhancement of NMR signals for alpha-cyclodextrin with laser-polarized xenon SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article DE cyclodextrins; host-guest chemistry; laser polarization; NMR spectroscopy; xenon ID MAGNETIC-RESONANCE; ADSORBED XENON; XE-129 NMR; NOBLE-GAS; SURFACE; SOLIDS C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. TEL AVIV UNIV,SCH CHEM,IL-69978 TEL AVIV,ISRAEL. NR 29 TC 54 Z9 55 U1 0 U2 14 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 10 11 61, D-69451 WEINHEIM, GERMANY SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD NOV 14 PY 1997 VL 36 IS 21 BP 2368 EP 2370 DI 10.1002/anie.199723681 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA YH944 UT WOS:A1997YH94400025 ER PT J AU Wang, JM Hartling, JA Flanagan, JM AF Wang, JM Hartling, JA Flanagan, JM TI The structure of ClpP at 2.3 angstrom resolution suggests a model for ATP-dependent proteolysis SO CELL LA English DT Article ID BACTERIAL CHAPERONIN GROEL; ESCHERICHIA-COLI CLPP; CRYSTAL-STRUCTURE; MOLECULAR CHAPERONES; SERINE PROTEASES; SUBSTRATE-SPECIFICITY; PROTEIN; DEGRADATION; COMPONENT; 2-COMPONENT AB We have determined the crystal structure of the proteolytic component of the caseinolytic Clp protease (ClpP) from E. coli at 2.3 Angstrom resolution using an ab initio phasing procedure that exploits the internal 14-fold symmetry of the oligomer. The structure of a ClpP monomer has a distinct fold that defines a fifth structural family of serine proteases but a conserved catalytic apparatus. The active protease resembles a hollow, solid-walled cylinder composed of two 7-fold symmetric rings stacked back-to-back. Its 14 proteolytic active sites are located within a central, roughly spherical chamber similar to 51 Angstrom in diameter. Access to the proteolytic chamber is controlled by two axial pores, each having a minimum diameter of similar to 10 Angstrom. From the structural features of ClpP, we suggest a model for its action in degrading proteins. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. YALE UNIV,DEPT MOL BIOPHYS & BIOCHEM,NEW HAVEN,CT 06520. FU NIGMS NIH HHS [GM-22778] NR 62 TC 413 Z9 419 U1 3 U2 22 PU CELL PRESS PI CAMBRIDGE PA 1050 MASSACHUSETTES AVE, CIRCULATION DEPT, CAMBRIDGE, MA 02138 SN 0092-8674 J9 CELL JI Cell PD NOV 14 PY 1997 VL 91 IS 4 BP 447 EP 456 DI 10.1016/S0092-8674(00)80431-6 PG 10 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA YG492 UT WOS:A1997YG49200006 PM 9390554 ER PT J AU Reichardt, D BonacicKoutecky, V Fantucci, P Jellinek, J AF Reichardt, D BonacicKoutecky, V Fantucci, P Jellinek, J TI Ab initio gradient corrected density functional molecular dynamics: investigation of structural and dynamical properties of the Li-8 cluster SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SELF-CONSISTENT-FIELD; ENERGY; APPROXIMATION; QUADRATURE; EXCHANGE; SIMULATIONS; PREDICTIONS; SCHEMES AB An ab initio molecular dynamics procedure based on gradient corrected density functionals for exchange and correlation with Gaussian atomic basis (AIMD-GDF) has been implemented for parallel processing. Gradients of the Born-Oppenheimer ground state energy, obtained by iterative solution of the Kohn-Sham (KS) equations, are used to calculate the forces acting on atoms at each instantaneous configuration. The procedure is suitable for detailed and accurate investigation of structural and dynamical properties of small systems. This is illustrated by applying the method to the study of individual isomers of the Li-8 cluster at increasing excess energy. (C) 1997 Elsevier Science B.V. C1 CTR CNR, DIPARTIMENTO CHIM INORGAN MET ORGAN & ANALIT, I-20133 MILAN, ITALY. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RP HUMBOLDT UNIV BERLIN, WALTHER NERNST INST PHYS & THEORET CHEM, BUNSENSTR 1, D-10117 BERLIN, GERMANY. NR 35 TC 40 Z9 41 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 14 PY 1997 VL 279 IS 3-4 BP 129 EP 139 DI 10.1016/S0009-2614(97)01019-1 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YL310 UT WOS:A1997YL31000003 ER PT J AU Oumi, M Maurice, D Lee, TJ HeadGordon, M AF Oumi, M Maurice, D Lee, TJ HeadGordon, M TI A diagnostic for the applicability of the CIS and CIS(D) excitation energy methods SO CHEMICAL PHYSICS LETTERS LA English DT Article ID COUPLED-CLUSTER SINGLES; MOLECULAR-ORBITAL THEORY; EXCITED-STATES; CONFIGURATION-INTERACTION; AB-INITIO; EQUATION; TRANSITION; MODEL AB A 'theta diagnostic' is introduced that measures the reliability of the single excitation configuration interaction (CIS) approach to excitation energies, and a second order perturbation correction, CIS(D). This diagnostic characterizes the extent of mixing between CIS excited states due to electron correlation effects through second order in a Moller-Plesset expansion. Its evaluation requires negligible additional computation in a CIS(D) calculation. Calculations on ethylene, formaldehyde, nitric acid, chlorine nitrate, styrene and benzaldehyde are presented to show its utility. Small diagnostic values indicate the CIS states are stable to near-degeneracy effects. (C) 1997 Elsevier Science B.V. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP Oumi, M (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Lee, Timothy/K-2838-2012 NR 28 TC 25 Z9 25 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 14 PY 1997 VL 279 IS 3-4 BP 151 EP 157 DI 10.1016/S0009-2614(97)01028-2 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YL310 UT WOS:A1997YL31000005 ER PT J AU Salsbury, FR Harris, RA AF Salsbury, FR Harris, RA TI Hydrogen chemical shieldings in small molecules: a magnetic field density functional approach SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HARTREE-FOCK; CONSTANTS; SHIFT AB Three approximations to the isotropic chemical shielding functional are used to calculate isotropic hydrogen chemical shieldings in small molecules. The approximations, at most, require the electron density and its angular derivative at the hydrogen nucleus. Results are compared to a variety of theoretical calculations and/or experiments. Deviations from these calculations are at worst off by 40%, and at best off by a few percent. (C) 1997 Elsevier Science B.V. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP Salsbury, FR (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Salsbury, Freddie/A-5923-2008 NR 31 TC 11 Z9 11 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 14 PY 1997 VL 279 IS 3-4 BP 247 EP 251 DI 10.1016/S0009-2614(97)00993-7 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YL310 UT WOS:A1997YL31000020 ER PT J AU Canfield, PC Budko, SL AF Canfield, PC Budko, SL TI Angular dependence of metamagnetic transitions in RNi2B2C (R = Er, Ho, Dy, and Tb) SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT 12th International Conference on Solid Compounds of Transition Elements (SCTE 97) CY APR 22-25, 1997 CL RENNES, FRANCE SP Lab Chim Solide & Inorganique Mol, CNRS, Univ Rennes, France DE angular dependence; metamagnetic transitions; applied magnetic field ID WEAK FERROMAGNETISM; SUPERCONDUCTIVITY; ERNI2B2C; COEXISTENCE; MAGNETISM; HONI2B2C; DYNI2B2C; BEHAVIOR; YBNI2B2C; TBNI2B2C AB The angular dependence of metamagnetic transitions is examined for RNi2B2C (R = Er - Tb) as a function of the angle the applied magnetic field makes with respect to the easy axis. For R = Ho and Dy the easy axis is [110] and for R = Er and Tb the easy axis is [100]. All four compounds manifest clear angular dependencies of three or more transitions. (C) 1997 Elsevier Science S.A. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Canfield, PC (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RI Canfield, Paul/H-2698-2014 NR 19 TC 36 Z9 36 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD NOV 14 PY 1997 VL 262 BP 169 EP 174 DI 10.1016/S0925-8388(97)00374-5 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA YN806 UT WOS:000071209700031 ER PT J AU Thorgeirsson, TE Xiao, WZ Brown, LS Needleman, R Lanyi, JK Shin, YK AF Thorgeirsson, TE Xiao, WZ Brown, LS Needleman, R Lanyi, JK Shin, YK TI Transient channel-opening in bacteriorhodopsin: an EPR study SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE electron paramagnetic resonance; spin labels; bacteriorhodopsin; photocycle; retinal proteins ID X-RAY-DIFFRACTION; STRUCTURAL-CHANGES; N-INTERMEDIATE; REPROTONATION SWITCH; PHOTOCYCLE; MECHANISM; TRANSDUCTION; TRANSPORT; MODEL; PUMP AB Active translocation of ions across membranes requires alternating access of the ion binding site inside the pump to the two membrane surfaces. Proton translocation by bacteriorhodopsin (bR), the Light-driven proton pump in Halobacterium salinarium, involves this kind of,a change in the accessibility of the centrally located retinal Schiff base. This key event in bR's photocycle ensures that proton release occurs to the extracellular side and proton uptake from the cytoplasmic side. To study the role of protein conformational changes in this reprotonation switch, spin labels were attached to pairs of engineered cysteine residues in the cytoplasmic interhelical loops of bR. Light-induced changes in the distance between a spin label on the EF interhelical loop and a label on either the AB or the CD interhelical loop were observed, and the changes were monitored following photoactivation with time-resolved electron paramagnetic resonance (EPR) spectroscopy. Both distances increase transiently by about 5 Angstrom during the photocycle. This opening occurs between proton release and uptake, and may be the conformational switch that changes the accessibility of the retinal Schiff base to the cytoplasmic surface after proton release to the extracellular side. (C) 1997 Academic Press Limited. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF IRVINE,DEPT PHYSIOL & BIOPHYS,IRVINE,CA 92697. WAYNE STATE UNIV,SCH MED,DEPT BIOCHEM,DETROIT,MI 48201. RI Brown, Leonid/A-1050-2008; Lanyi, Janos/C-3808-2011; OI Brown, Leonid/0000-0002-5614-8317; xiao, wenzhong/0000-0003-4944-6380; Thorgeirsson, Thorgeir/0000-0002-5149-7040 FU NIGMS NIH HHS [GM51290-03] NR 30 TC 101 Z9 102 U1 0 U2 4 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD NOV 14 PY 1997 VL 273 IS 5 BP 951 EP 957 DI 10.1006/jmbi.1997.1362 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YH779 UT WOS:A1997YH77900001 PM 9367783 ER PT J AU Neu, R Fournier, KB Schlogl, D Rice, J AF Neu, R Fournier, KB Schlogl, D Rice, J TI Observations of x-ray spectra from highly charged tungsten ions in tokamak plasmas SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID LASER-PRODUCED PLASMAS; TRANSITIONS; PROGRAM; RANGE; ATOMS; RE AB X-ray spectra in the range 7-10 Angstrom from highly charged tungsten (Z = 74) ions were observed in the tokamak ASDEX Upgrade. Lines emitted from W37+ to W47+ were identified by comparison with ab initio calculations and with the expected ionization equilibrium charge-state distribution. Most of the features in the observed spectra coincide with predicted lines. A spectral line of As I-like W41+ could be identified as the predominant one for plasmas with 2.5-3 keV central electron temperature. The calculations predict clearly separated spectral lines for Kr I-like W at about 18.4 Angstrom and strong lines between 5.6 and 6.0 Angstrom for all charge states under consideration that can be used for monitoring W densities in the soft x-ray region. Tungsten concentrations in the range of 10(-4) were extracted from the emissivities of spectral lines from W40+ and W41+. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. MIT,PLASMA SCI & FUS CTR,CAMBRIDGE,MA 02139. RP Neu, R (reprint author), MAX PLANCK INST PLASMA PHYS,IPP,EURATOM ASSOC,D-85748 GARCHING,GERMANY. RI Neu, Rudolf /B-4438-2010 OI Neu, Rudolf /0000-0002-6062-1955 NR 35 TC 51 Z9 52 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL, ENGLAND BS1 6BE SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 14 PY 1997 VL 30 IS 21 BP 5057 EP 5067 DI 10.1088/0953-4075/30/21/036 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YH110 UT WOS:A1997YH11000036 ER PT J AU Hemmers, O Fisher, G Glans, P Hansen, DL Wang, H Whitfield, SB Wehlitz, R Levin, JC Sellin, IA Perera, RCC Dias, EWB Chakraborty, HS Deshmukh, PC Manson, ST Lindle, DW AF Hemmers, O Fisher, G Glans, P Hansen, DL Wang, H Whitfield, SB Wehlitz, R Levin, JC Sellin, IA Perera, RCC Dias, EWB Chakraborty, HS Deshmukh, PC Manson, ST Lindle, DW TI Beyond the dipole approximation: angular-distribution effects in valence photoemission SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID RANDOM-PHASE APPROXIMATION; DISTRIBUTION PARAMETERS; MULTIPOLE CORRECTIONS; LOW ENERGIES; PHOTOELECTRONS; PHOTOIONIZATION; RETARDATION AB Angular distributions of valence photoelectrons showing effects due to higher-multipole photon interactions have been measured for the first time. Neon 2s and 2p photoemission exhibits effects beyond the dipole approximation throughout the 250-1200 eV photon-energy range studied. The results suggest that any photoemission experiment, on any sample, can be affected at relatively low photon energies, pointing to a general need for caution in interpreting angle-resolved-photoemission measurements. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. INDIAN INST TECHNOL,DEPT PHYS,MADRAS 600036,TAMIL NADU,INDIA. GEORGIA STATE UNIV,DEPT PHYS,ATLANTA,GA 30303. RP Hemmers, O (reprint author), UNIV NEVADA,DEPT CHEM,LAS VEGAS,NV 89154, USA. NR 25 TC 84 Z9 85 U1 0 U2 9 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL, ENGLAND BS1 6BE SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 14 PY 1997 VL 30 IS 21 BP L727 EP L733 DI 10.1088/0953-4075/30/21/003 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YH110 UT WOS:A1997YH11000003 ER PT J AU McPherson, A Cobble, J Borisov, AB Thompson, BD Omenetto, F Boyer, K Rhodes, CK AF McPherson, A Cobble, J Borisov, AB Thompson, BD Omenetto, F Boyer, K Rhodes, CK TI Evidence of enhanced multiphoton (248 nm) coupling from single-pulse energy measurements of Xe(L) emission induced from Xe clusters SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID INTENSE LASER-PULSES; RAY-EMISSION; XENON CLUSTERS; CHANNELED PROPAGATION; UNDERDENSE PLASMA; CROSS-SECTIONS; EXCITATION; IONIZATION; AMPLIFICATION; TEMPERATURE AB Single-pulse energy measurements of the Xe(L) emission induced by femtosecond (similar to 270 fs) multiphoton ultraviolet (248 nm) excitation of Xe clusters have been made with a transmission grating spectrograph equipped with a calibrated x-ray CCD camera. On the basis of the observed magnitude of the Xe(L) single-pulse yield (3 mu J less than or equal to E(L) less than or equal to 6 mu J) and the morphology measured by Thomson scattering of the self-trapped channels guiding the incident 248 nm pulse, it is concluded that the coupling strength for x-ray production from the clusters cannot be accounted for by an interaction involving only independent single-electron processes. Analysis indicates that the coupling requires augmentation by a factor of similar to 22-45. This conclusion is in good agreement with an independent spectral study involving the direct comparison of the multiphoton coupling strength with electron collisional data for Xe obtained from EBIT studies, an analysis which placed the corresponding factor of augmentation of the coupling in the interval similar to 25-50. These findings are consistent with estimates of the magnitude of the strengthened coupling which could arise from the development of ordered multi-electron motions. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TSUKUBA,TSUKUBA ADV RES ALLIANCE,TSUKUBA,IBARAKI 305,JAPAN. RP McPherson, A (reprint author), UNIV ILLINOIS,DEPT PHYS MC 273,845 W TAYLOR ST,CHICAGO,IL 60607, USA. NR 38 TC 12 Z9 12 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL, ENGLAND BS1 6BE SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 14 PY 1997 VL 30 IS 21 BP L767 EP L775 DI 10.1088/0953-4075/30/21/008 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YH110 UT WOS:A1997YH11000008 ER PT J AU Kennedy, BM Kharaka, YK Evans, WC Ellwood, A DePaolo, DJ Thordsen, J Ambats, G Mariner, RH AF Kennedy, BM Kharaka, YK Evans, WC Ellwood, A DePaolo, DJ Thordsen, J Ambats, G Mariner, RH TI Mantle fluids in the San Andreas fault system, California SO SCIENCE LA English DT Article ID ISOTOPIC COMPOSITION; PLATE BOUNDARY; PACIFIC PLATE; COAST-RANGES; HELIUM; GASES; CARBON; YELLOWSTONE; COMPACTION; TECTONICS AB Fluids associated with the San Andreas and companion faults in central and southcentral California have high He-3/He-4 ratios. The lack of correlation between helium isotopes and fluid chemistry or local geology requires that fluids enter the fault system from the mantle. Mantle fluids passing through the ductile lower crust must enter the brittle fault zone at or near lithostatic pressures; estimates of fluid flux based on helium isotopes suggest that they may thus contribute directly to fault-weakening high-fluid pressures at seismogenic depths. C1 US GEOL SURVEY,DIV WATER RESOURCES,MENLO PK,CA 94025. UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,CTR ISOTOPE GEOCHEM,BERKELEY,CA 94720. RP Kennedy, BM (reprint author), LAWRENCE BERKELEY NATL LAB,CTR ISOTOPE GEOCHEM,BERKELEY,CA 94720, USA. RI Evans, William/J-4283-2012 NR 39 TC 139 Z9 154 U1 1 U2 20 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 14 PY 1997 VL 278 IS 5341 BP 1278 EP 1281 DI 10.1126/science.278.5341.1278 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA YG043 UT WOS:A1997YG04300041 ER PT J AU Larsen, FH Jakobsen, HJ Ellis, PD Nielsen, NC AF Larsen, FH Jakobsen, HJ Ellis, PD Nielsen, NC TI Sensitivity-enhanced quadrupolar-echo NMR of half-integer quadrupolar nuclei. Magnitudes and relative orientation of chemical shielding and quadrupolar coupling tensors SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID PRINCIPAL-AXIS SYSTEMS; MAGNETIC-RESONANCE; SPIN-ECHO; MAS-NMR; ANISOTROPIC MEDIA; LINE-SHAPES; CO-59 NMR; SPECTROSCOPY; SOLIDS; RB-87 AB A novel approach to quadrupolar-echo (QE) NMR of half-integer quadrupolar nuclei in static powders is analyzed. By acquisition of the QE spectrum during a Carr-Purcell-Meiboom-Gill (CPMG) train of selective pi pulses, the second-order quadrupolar line shape for the central transition is split into a comb of sidebands leading to a considerable increase in the sensitivity compared to a conventional QE spectrum. The applicability of the method for determination of magnitudes and relative orientation of chemical shielding and quadrupolar coupling tensors is examined. Through numerical simulation and iterative fitting of experimental Rb-87 (RbClO4 and RbVO3) and Co-59 spectra (Co(NH3)(5) Cl-3), it is demonstrated that the quadrupolar CPMG experiment represents a useful method for studying half-integer quadrupolar nuclei exhibiting large quadrupolar coupling combined with anisotropic chemical shielding interactions. Sensitivity enhancements by a factor of up to about 30 are observed for the samples studied. C1 AARHUS UNIV, DEPT CHEM, INSTRUMENT CTR SOLID STATE NMR SPECT, DK-8000 AARHUS C, DENMARK. PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. RI Larsen, Flemming/A-5255-2015 OI Larsen, Flemming/0000-0001-5180-6870 NR 51 TC 202 Z9 204 U1 4 U2 51 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 13 PY 1997 VL 101 IS 46 BP 8597 EP 8606 DI 10.1021/jp971547b PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG462 UT WOS:A1997YG46200005 ER PT J AU Kumaran, SS Su, MC Lim, KP Michael, JV Klippenstein, SJ DiFelice, J Mudipalli, PS Kiefer, JH Dixon, DA Peterson, KA AF Kumaran, SS Su, MC Lim, KP Michael, JV Klippenstein, SJ DiFelice, J Mudipalli, PS Kiefer, JH Dixon, DA Peterson, KA TI Experiments and theory on the thermal decomposition of CHCl3 and the reactions of CCl2 SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; COLLISION RATE CONSTANTS; MOLECULAR WAVE-FUNCTIONS; UNIMOLECULAR RATE THEORY; SHOCK TUBE TECHNIQUE; GAUSSIAN-BASIS SETS; FALL-OFF RANGE; BENCHMARK CALCULATIONS; DIATOMIC HYDRIDES; ATOM ABSORPTION AB Rate constants for the thermal decomposition of CHCl3 in Kr diuent have been measured by the laser schlieren density gradient method. The only decomposition process indicated is molecular elimination giving the singlet carbene, CCl2, and HCl. Rate constants are determined under different conditions of density over the temperature range 1282-1878 K, giving k(+/-15%) = 4.26 x 10(16) exp(-22 516 WT) cm(3) mol(-1) s(-1). Electronic structure calculations have provided models for both the transition state and molecule. With these models, both semiempirical Tree and Rice-Ramsperger-Kassel-Marcus unimolecular theoretical calculations are carried out. The experimental results agree with theory provided E-0 = 56.0 kcal mol(-1) and (Delta E)(down) = (820 +/- 30) cm(-1), suggesting that the barrier for back reaction is 3.8 kcal mol(-1). Cl-atom atomic resonance absorption spectrometric (ARAS) experiments, also in Kr diluent, are then carried out, confirming that atom formation is entirely due to the thermal reactivity of CCl2. On the basis of Cl-atom yield measurements, a mechanism for Cl-atom formation is devised. Chemical simulations of the absolute Cl-atom profile data then provide estimates of the temperature dependences for the rate constants used in the mechanism. These results ate discussed in terms of unimolecular reaction rate theory suggesting that the heat of formation for CCl radicals is 100 +/- 4 kcal mol(-1) at 0 K. Our calculated results (R-CCSD(T)) extrapolated to the complete Delta(f)H(CCl20K)(0) = 53.0 and Delta fH(CCl,0K)(0) = 102.5 kcal mol(-1) and are consistent with the experimental results reported herein. Additionally, the results suggest that CCl2 undergoes dissociative recombination with a substantial activation energy. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. UNIV ILLINOIS, DEPT CHEM ENGN, CHICAGO, IL 60680 USA. PACIFIC NW LAB, ENVIRONM MOL SCI LAB, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA. RI Michael, Joe/E-3907-2010; OI Klippenstein, Stephen/0000-0001-6297-9187 NR 67 TC 50 Z9 51 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 13 PY 1997 VL 101 IS 46 BP 8653 EP 8661 DI 10.1021/jp971723g PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG462 UT WOS:A1997YG46200012 ER PT J AU Wu, CJ Fried, LE AF Wu, CJ Fried, LE TI Ab initio study of RDX decomposition mechanisms SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID DENSITY-FUNCTIONAL THEORY; HARTREE-FOCK; THERMAL-DECOMPOSITION; MOLECULAR GEOMETRIES; ELECTRONIC-STRUCTURE; CHEMICAL-REACTIONS; EXACT EXCHANGE; BASIS-SETS; GAS-PHASE; PERFORMANCE AB The mechanism of the gas phase unimolecular decomposition of hexahydro-1,3,5,-trinitro-1,3,5,-triazine (RDX) has been investigated using first principles gradient-corrected density functional theory. We have calculated the potential energy profile for two previously suggested dissociation channels: (I) N-NO2 bond rupture, and (II) concerted ring fission to three methylenenitramine molecules. The activation barriers for channels I and II are predicted to be 34.2 and 52.5 kcal/mol at the B-PW91/cc-pVDZ level, respectively. We have performed a simple transition state theory analysis which indicates that the prefactors for channel I and II are roughly 7 x 10(17) and 1 x 10(17) s(-1), respectively. Thus, our results suggest that path I is the dominant channel in gas phase thermal RDX decomposition. RP Wu, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RI Fried, Laurence/L-8714-2014 OI Fried, Laurence/0000-0002-9437-7700 NR 52 TC 79 Z9 83 U1 3 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 13 PY 1997 VL 101 IS 46 BP 8675 EP 8679 DI 10.1021/jp970678+ PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG462 UT WOS:A1997YG46200015 ER PT J AU Redfern, PC Blaudeau, JP Curtiss, LA AF Redfern, PC Blaudeau, JP Curtiss, LA TI Assessment of modified Gaussian-2 (G2) and density functional theories for molecules containing third-row atoms Ga-Kr SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID MOLLER-PLESSET; 3RD-ROW ATOMS; EXCHANGE; ENERGY AB The performance of G2(MP2) and G2(MP2,SVP) theories for molecules containing third-row nontransition elements Ga-Kr is assessed. The average absolute deviation from experiment for 40 test energies is 1.92 kcal/mol for both methods compared to 1.37 kcal/mol for G2 theory. Four density functional theories (BPW91, BLYP, B3PW91, and B3LYP) are also assessed for the 40 test energies and found to have average absolute deviations of 3.58, 4.75, 2.03, and 2.62 kcal/mol, respectively. The B3PW91 density functional theory gives the best agreement with experiment in contrast to first-and second-row systems, where B3LYP does better than B3PW91. Of the four density functional methods, the B3PW91 method gave the best agreement with experiment for geometries and is about as accurate as second-order perturbation theory. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,DIV SCI MAT,ARGONNE,IL 60439. NR 16 TC 42 Z9 42 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD NOV 13 PY 1997 VL 101 IS 46 BP 8701 EP 8705 DI 10.1021/jp971491l PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YG462 UT WOS:A1997YG46200018 ER PT J AU Chakoumakos, BC Loong, CK Schultz, AJ AF Chakoumakos, BC Loong, CK Schultz, AJ TI Low-temperature structure and dynamics of brucite SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID NEUTRON-DIFFRACTION; PRESSURE; MG(OH)(2); M(OH)(2); CA(OH)2; MG(OD)2; SPECTRA AB Structural refinements of time-of-flight neutron powder diffraction data for Mg(OD)(2) and inelastic neutron scattering measurements for Mg(OH)2 demonstrate that the mechanism of thermal contraction is primarily the reduction of the octahedral thickness and secondarily the reduction of the interlayer thickness. The contraction of the octahedral layer thickness is 4 times as great as the contraction of the interlayer thickness over the temperature interval 300-15 K. The volume of brucite at 15 K is equivalent to that at 0.2 GPa which should not be sufficient to observe the H-bonding between the octahedral layer that occurs at high pressure; however, the three-site split-atom model, in which the O-D direction makes an angle a with the 3-fold c axis, provides a better fit to the data for each temperature than the single-site model. The O-D distance from the single-site model is markedly shortened by the large atomic displacement parameter of the D atom, but if the O-D distance is corrected for ''riding'' motion, it lengthens roughly to the same values determined from the three-site split-atom model. The temperature dependence of the lattice parameters are given by a = 3.1435 + 2.911 x 10(-5)T + 9.944 x 10(-8)T(2) -1.965 x 10(-11)T(3) -4.789 x 10(-13)T(4), c = 4.7478 + 1.793 x 10(-4)T + 4.496 x 10(-7)T(2) + 3.910 x 10(-10)T(3), V = 40.635 + 2.330 x 10(-3)T + 5.592 x 10(-6)T(2) + 1.748 x 10(-9)T(3), for T in degrees C. The vibrational spectrum of hydrogen in Mg(OH)(2) at 15 K obtained from inelastic scattering measurements shows a sharp OH stretch band at 461.8 meV, an E-u OH libration at 47.5 meV, and other broad features due to lattice vibrations and combination excitations. No evidence of enhanced hydrogen bonding was found at low temperatures. C1 ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. RP Chakoumakos, BC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 22 TC 29 Z9 30 U1 1 U2 16 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 13 PY 1997 VL 101 IS 46 BP 9458 EP 9462 DI 10.1021/jp972225a PG 5 WC Chemistry, Physical SC Chemistry GA YG463 UT WOS:A1997YG46300008 ER PT J AU Stevens, RG AF Stevens, RG TI Leukemia and exposure to magnetic fields SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP Stevens, RG (reprint author), PACIFIC NW NATL LAB,RICHLAND,WA 99352, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD NOV 13 PY 1997 VL 337 IS 20 BP 1471 EP 1472 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA YF253 UT WOS:A1997YF25300014 PM 9380107 ER PT J AU Templon, JA Raue, BA Murphy, K Millener, DJ Carman, DS Huber, GM Markham, BC Miller, DW Schwandt, P Bland, LC AF Templon, JA Raue, BA Murphy, K Millener, DJ Carman, DS Huber, GM Markham, BC Miller, DW Schwandt, P Bland, LC TI Study of continuum nuclear structure of C-12 via (p,p ' X) at intermediate energies SO PHYSICS LETTERS B LA English DT Article DE (p,p '); decay; angular correlations; giant resonances ID GIANT-RESONANCE; SCATTERING; STRENGTH; DECAY AB The inclusive C-12(p,p') and exclusive C-12(p,p'X) reactions have been studied with a beam energy of 156 MeV and for X = p and alpha. The study focuses on the (p,p'X) reaction mechanism and on the structure of C-12 just above the particle-emission threshold, 14 less than or equal to E-x less than or equal to 28 MeV. Cross sections were simultaneously measured for all three reactions. The exclusive data were analyzed by making multiple-peak fits of the spectra and by Legendre-polynomial fits of the angular correlations. Multiple-peak fits were also made of the inclusive spectra. An analysis of the results shows that this region of E-x consists predominantly of resonant excitations, in contradiction to the findings of previous analyses. (C) 1997 Elsevier Science B.V. C1 Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA. Florida Int Univ, Miami, FL 33199 USA. Univ Regina, Regina, SK S4S 0A2, Canada. Indiana Univ, Cyclotron Facil, Bloomington, IN 47408 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Templon, JA (reprint author), Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA. OI Templon, Jeffrey/0000-0002-3371-788X NR 33 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 13 PY 1997 VL 413 IS 3-4 BP 253 EP 259 DI 10.1016/S0370-2693(97)01149-0 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YM657 UT WOS:000071086700003 ER PT J AU Petersson, EJ Fanuele, JC Nimlos, MR Lemal, DM Ellison, GB Radziszewski, JG AF Petersson, EJ Fanuele, JC Nimlos, MR Lemal, DM Ellison, GB Radziszewski, JG TI Nonplanarity of tetrafluorocyclobutadiene SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CYCLOBUTADIENE; SPECTRUM; MATRIX C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. DARTMOUTH COLL,DEPT CHEM,HANOVER,NH 03755. UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309. NR 24 TC 17 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 12 PY 1997 VL 119 IS 45 BP 11122 EP 11123 DI 10.1021/ja971930u PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA YG273 UT WOS:A1997YG27300044 ER PT J AU Swank, RA Thng, JPH Guo, XW Valdez, J Bradbury, EM Gurley, LR AF Swank, RA Thng, JPH Guo, XW Valdez, J Bradbury, EM Gurley, LR TI Four distinct cyclin-dependent kinases phosphorylate histone H1 at all of its growth-related phosphorylation sites SO BIOCHEMISTRY LA English DT Article ID CHINESE-HAMSTER CELLS; CHROMOSOME CONDENSATION; F1-HISTONE PHOSPHOKINASE; PHYSARUM-POLYCEPHALUM; CHROMATIN; MITOSIS; PROTEIN; METAPHASE AB In mammalian cells, up to six serines and threonines in histone H1 are phosphorylated in vivo in a cell cycle dependent manner that has long been linked with chromatin condensation. Growth-associated H1 kinases, now known as cyclin-dependent kinases (CDKs), are thought to be the enzymes responsible for this process. This paper describes the phosphorylation of histone H1 by four different purified CDKs. The four CDKs phosphorylate only the cell cycle specific phosphorylation sites of H1, indicating that they belong to the kinase class responsible for growth-related H1 phosphorylation in vivo. All four CDKs phosphorylate all of the interphase and mitotic-specific H1 sites. In addition to the (S/T)PXK consensus phosphorylation sires, these four CDKs also phosphorylate a mitotic-specific in vivo H1 phosphorylation site that lacks this sequence. There is no site selectivity among the growth-related phosphorylation sites by any of the four CDKs because all four CDKs phosphorylate all relevant sites. The results imply that the cell cycle dependent H1 phosphorylations observed in vivo must involve differential accessibility of H1 sites at different stages of the cell cycle. C1 UNIV CALIF DAVIS, DEPT BIOL CHEM, SCH MED, DAVIS, CA 95616 USA. LOS ALAMOS NATL LAB, DIV LIFE SCI, LOS ALAMOS, NM 87545 USA. FU NIGMS NIH HHS [GM 45890-03] NR 53 TC 34 Z9 34 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 11 PY 1997 VL 36 IS 45 BP 13761 EP 13768 DI 10.1021/bi9714363 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YF601 UT WOS:A1997YF60100002 PM 9374852 ER PT J AU Feng, BB Gorin, A Hingerty, BE Geacintov, NE Broyde, S Patel, DJ AF Feng, BB Gorin, A Hingerty, BE Geacintov, NE Broyde, S Patel, DJ TI Structural alignment of the (+)-trans-anti-benzo[a]pyrene-dG adduct positioned opposite dC at a DNA template-primer junction SO BIOCHEMISTRY LA English DT Article ID (+)-ANTI-BENZOPYRENE DIOL EPOXIDE; NUCLEAR MAGNETIC-RESONANCE; 2D NMR-SPECTRA; SOLUTION CONFORMATION; MODIFIED DEOXYGUANOSINE; SINGLE STEREOISOMER; BASE DISPLACEMENT; MAJOR ADDUCT; BENZOPYRENE; DUPLEX AB This study reports on the solution conformation of the covalent (+)-trans-anti-[BP]dG adduct (derived from the binding of the highly mutagenic and tumorigenic (+)-anti-benzo[a]pyrene diol epoxide to the N-2 of deoxyguanosine) positioned opposite dC at a junctional site in the d(A1-A2-C3-[BP]G4-C5-T6-A7-C8-C9-A10-T11-C12-C13). d(G14-G15-A16-T17-G18-G19-T20-A21-G22-C23) 13/10-mer DNA sequence. The 13-mer represents the template strand containing the junction [BP]dG4 lesion while the complementary 10-mer models a primer strand which extends upto and is complementary to the modified dG4 residue. The solution conformation has been determined by initially incorporating intramolecular and intermolecular proton-proton distances defined by lower and upper bounds deduced from NOESY spectra as restraints in molecular mechanics computations in torsion angle space and subsequently through restrained molecular dynamics calculations based on a NOE distance and intensity refinement protocol. The duplex segment retains a minimally perturbed B-DNA conformation with all base pairs, including the junctional [BP]dG4 . dC23 pair, in Watson-Crick hydrogen-bonded alignments, The pyrenyl ring is not stacked over the adjacent dC5 . dG22 base pair but is positioned on the minor groove-side of the [BP]dG moiety and directed toward the 5'-end of the template strand. The pyrenyl ring stacks over the base of the non-adjacent dA2 residue in one direction and the sugar ring of dC23 in the other direction. The solution structure of the (+)-trans-anti-[BP]dG adduct opposite dC in the 13/10-mer in which the modified deoxyguanosine adopts an anti glycosidic torsion angle (this study) is in striking contrast to the structure of the same (+)-trans-anti-[BP]dG moiety in a 13/9-mer of the same sequence but without the dC23 residue positioned opposite the adduct site [Cosman, M,, et al. (1995) Biochemistry 34, 15334-15350]. For the latter case, the aromatic portion of the BP residue stacks over the adjacent dC5 . dG22 base pair, the modified deoxyguanosine adopts a syn glycosidic torsion angle and is displaced toward the major groove direction. Insights into the factors that affect the sequence and context dependent conformations of stereoisomeric [BP]dG lesions have emerged following comparison of these two structures with the minor groove conformations of the same (+)-trans-anti-[BP]dG lesion in the fully complementary Il-mer duplex [Cosman, M., et al. (1992) Proc. Natl. Acad. Sci, U.S.A. 89, 1914-1918] and in the base displaced-intercalative conformation of the 11/10-mer deletion duplex containing a -1 deletion site opposite the lesion [Cosman, M., et al. (1994) Biochemistry 33, 11507-11517]. The contributing factors where applicable include Watson-Crick base pairing at the site of the lesion, positioning of the carcinogen within the floor of the minor groove, and the tendency of the bulky hydrophobic aromatic BP residue to assume stacked or intercalative conformations. C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. KNOX COMP CONSULTANTS,KNOXVILLE,TN 37923. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. RI Gorin, Andrey/B-1545-2014 FU NCI NIH HHS [CA-20851, CA-28038, CA-46533] NR 41 TC 37 Z9 37 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 11 PY 1997 VL 36 IS 45 BP 13769 EP 13779 DI 10.1021/bi970069s PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YF601 UT WOS:A1997YF60100003 PM 9374853 ER PT J AU Feng, BB Gorin, A Kolbanovskiy, A Hingerty, BE Geacintov, NE Broyde, S Patel, DJ AF Feng, BB Gorin, A Kolbanovskiy, A Hingerty, BE Geacintov, NE Broyde, S Patel, DJ TI Solution conformation of the (-)-trans-anti-[BP]dG adduct opposite a deletion site in a DNA duplex: Intercalation of the covalently attached benzo[a]pyrene into the helix with base displacement of the modified deoxyguanosine into the minor groove SO BIOCHEMISTRY LA English DT Article ID DEOXYADENOSINE N-6-AMINO GROUP; NUCLEAR-MAGNETIC-RESONANCE; RAS CODON-61 SEQUENCE; INDUCED FRAMESHIFT MUTAGENESIS; C-8-MODIFIED SYN GUANINE; NMR SOLUTION STRUCTURE; DG MISMATCH OPPOSITE; MAJOR GROOVE; OPTICAL ENANTIOMERS; TRANS ADDITION AB A combined NMR-computational approach was employed to determine the solution structure of the (-)-trans-anti-[BP]dG adduct positioned opposite a -1 deletion site in the d(C1-C2-A3-T4-C5-[BP]Cs-C7-T8-A9-C10-C11). d(G12-G13-T14-A15-G16-G17-A18-T19-G20-G21) sequence context, The (-)-trans-anti-[BP]dG moiety is derived from the binding of the (-)-anti-benzo[a]pyrene diol epoxide [(-)-anti-BPDE] to N-2 of dG6 and has a 10R absolute configuration at the [BP]dG linkage site. The exchangeable and non-exchangeable protons of the benzo[a]pyrenyl moiety and the nucleic acid were assigned following analysis of two-dimensional NMR data sets in H2O and D2O solution, The solution conformation has been determined by incorporating intramolecular and intermolecular proton-proton distances defined by lower and upper bounds deduced from NOESY spectra as restraints in molecular mechanics computations in torsion angle space followed by restrained molecular dynamics calculations based on a NOE distance and intensity refinement protocol, Our structural studies establish that the aromatic BP ring system intercalates into the helix opposite the deletion site, while the modified deoxyguanosine residue is displaced into the minor groove with its face parallel to the helix axis, The intercalation site is wedge-shaped and the BP aromatic ring system slacks over intact flanking Watson-Crick dG.dC base pairs. The modified deoxyguanosine stacks over-the minor groove face of the sugar ring of the 5'-flanking dC5 residue. The BP moiety is positioned with the benzylic ting oriented toward the minor groove and the distal pyrenyl aromatic ring directed toward the major groove. This conformation strikingly contrasts with the corresponding structure in the full duplex with the same 10R (-)-trans-anti-[BP]dG lesion positioned opposite a complementary dC residue [de los Santos et al. (1992) Biochemistry 31, 5245-5252); in this case the aromatic BP ring system is located in the minor groove, and there is no disruption of the [BP]dG.dC Watson-Crick base pairing alignment. The intercaIation-base displacement features of the 10R (-)-trans-anti-[BP]dG adduct opposite a deletion site have features in common to those of the 10S (+)-trans-anti-[BP]dG adduct opposite a deletion site previously reported by Cosman et al. [(1994)(Biochemistry 33, 11507-12517], except that there is a nearly 180 degrees rotation of the BP residue about the axis of the helix at the base-displaced intercalation site and the modified deoxyguanosine is positioned in the opposite groove. In the 10S adduct, the benzylic ring is in the major groove and the aromatic ring systems point toward the minor groove. This work extends the theme of opposite orientations of adducts derived from chiral pairs of (+)- and (-)-anti-BPDE enantiomers; both 10S and 10R adducts can be positioned with opposite orientations either in the minor groove or at base displaced intercalation sites, depending on the presence or absence of the partner dC base in the complementary strand. C1 MEM SLOAN KETTERING CANC CTR, CELLULAR BIOCHEM & BIOPHYS PROGRAM, NEW YORK, NY 10021 USA. NYU, DEPT CHEM, NEW YORK, NY 10003 USA. NYU, DEPT BIOL, NEW YORK, NY 10003 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. KNOX COMP CONSULTANTS, KNOXVILLE, TN 37923 USA. RI kolbanovskiy, aleksandr/I-7278-2013; Gorin, Andrey/B-1545-2014 FU NCI NIH HHS [CA-28038, CA-20851, CA-46533] NR 49 TC 22 Z9 22 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 NOV 11 PY 1997 VL 36 IS 45 BP 13780 EP 13790 DI 10.1021/bi970070r PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YF601 UT WOS:A1997YF60100004 PM 9374854 ER PT J AU Allgower, CE Arvieux, J Ausset, P Ball, J Beauvais, PY Bedfer, Y Bystricky, J Chamouard, PA Demierre, P Fontaine, JM Janout, Z Kalinnikov, VA Kasprzyk, TE Khachaturov, BA Kunne, R Lagniel, JM Lehar, F deLesquen, A Popov, AA Prokofiev, AN Rapin, D Sans, JL Spinka, HM Teglia, A Vikhrov, VV Vuaridel, B Zhdanov, AA AF Allgower, CE Arvieux, J Ausset, P Ball, J Beauvais, PY Bedfer, Y Bystricky, J Chamouard, PA Demierre, P Fontaine, JM Janout, Z Kalinnikov, VA Kasprzyk, TE Khachaturov, BA Kunne, R Lagniel, JM Lehar, F deLesquen, A Popov, AA Prokofiev, AN Rapin, D Sans, JL Spinka, HM Teglia, A Vikhrov, VV Vuaridel, B Zhdanov, AA TI Dependence of proton beam polarization on ion source transition configurations SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PP ELASTIC-SCATTERING; ANALYZING POWER; CARBON; REGION; ANN AB The polarization of extracted SATURNE II proton beam as a function of different ion source configurations was studied. Two distinct experiments were necessary for this purpose. In the first one, the LEFT-RIGHT instrumental asymmetry of the beam polarimeter was determined using an unpolarized beam. In the second one this correction factor was applied to asymmetries measured with the beam from the polarized ion source in all polarization states. The measurements were carried out at the proton beam kinetic energy 0.80 GeV, where the pp-elastic scattering analysing power is near its maximum. The results confirmed that the two so-called ''unpolarized states'' of the source were polarized to several percent, whereas the absolute values of the beam polarizations in the so-called ''polarized states'' were equal and opposite. It was observed that the hexapole lens of the ion source produced beam polarization in the absence of any transition. The beam polarization as a function of hexapole current, transition field attenuation, and spin rotation solenoid current was measured. It was also shown how to obtain a strictly unpolarized beam using the polarized source only. The results obtained with the SATURNE II ion source HYPERION may also be relevant to similar sources at other accelerators. C1 CTR ETUD SACLAY,CEA,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,CEA,DSM,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,IN2P3,CNRS,LAB NATL SATURNE,F-91191 GIF SUR YVETTE,FRANCE. ARGONNE NATL LAB,HEP DIV,ARGONNE,IL 60439. UNIV GENEVA,DPNC,CH-1211 GENEVA 4,SWITZERLAND. CZECH TECH UNIV,FAC NUCL SCI & PHYS ENGN,CR-11519 PRAGUE 1,CZECH REPUBLIC. JOINT INST NUCL RES,LAB NUCL PROBLEMS,DUBNA 141980,MOSCOW REGION,RUSSIA. PETERSBURG NUCL PHYS INST,GATCHINA 188350,RUSSIA. NR 23 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 171 EP 179 DI 10.1016/S0168-9002(97)00905-4 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500001 ER PT J AU Akchurin, N Ayan, S Bencze, GL Chikin, K Cohn, H Doulas, S Dumanoglu, I Eskut, E Fenyvesi, A Ferrando, A Fouz, MC Ganel, O Gavrilov, V Gershtein, Y Hajdu, C Iosifidis, J Josa, MI Khan, A Kim, SB Kolosov, V Kuleshov, S Langland, J Litvintsev, D Merlo, JP Molnar, J Nikitin, A Onel, Y Onengut, G Osborne, D OzdesKoca, N Penzo, A Pesen, E Podrasky, V Rosowsky, A Salico, JM Sanzeni, C Sever, R Silvestri, H Stolin, V Sulak, L Sullivan, J Ulyanov, A Uzunian, S Vesztergombi, G Wigmans, R Winn, D Winsor, R Yumashev, A Zalan, P Zeyrek, M AF Akchurin, N Ayan, S Bencze, GL Chikin, K Cohn, H Doulas, S Dumanoglu, I Eskut, E Fenyvesi, A Ferrando, A Fouz, MC Ganel, O Gavrilov, V Gershtein, Y Hajdu, C Iosifidis, J Josa, MI Khan, A Kim, SB Kolosov, V Kuleshov, S Langland, J Litvintsev, D Merlo, JP Molnar, J Nikitin, A Onel, Y Onengut, G Osborne, D OzdesKoca, N Penzo, A Pesen, E Podrasky, V Rosowsky, A Salico, JM Sanzeni, C Sever, R Silvestri, H Stolin, V Sulak, L Sullivan, J Ulyanov, A Uzunian, S Vesztergombi, G Wigmans, R Winn, D Winsor, R Yumashev, A Zalan, P Zeyrek, M TI Beam test results from a fine-sampling quartz fiber calorimeter for electron, photon and hadron detection SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ELECTROMAGNETIC CALORIMETER; RADIATION RESISTANT; DEPENDENCE; PROTOTYPE AB We present the results of beam tests with high-energy (8-375 GeV) electrons, pions, protons and muons of a sampling calorimeter based on the detection of Cherenkov light produced by shower particles. The detector, a prototype for the very forward calorimeters in the CMS experiment, consists of thin quartz fibers embedded in a copper matrix. Results are given on the light yield of this device, on its energy resolution for electron and hadron detection, and on the signal uniformity and linearity. The signal generation mechanism gives this type of detector unique properties, especially for the detection of hadron showers: narrow, shallow shower profiles and extremely fast signals. These specific properties were measured in detail. The implications for measurements in the high-rate, high-radiation Large Hadron Collider (LHC) environment are discussed. C1 TEXAS TECH UNIV,DEPT PHYS,LUBBOCK,TX 79409. ITEP,MOSCOW,RUSSIA. FAIRFIELD UNIV,FAIRFIELD,CT 06430. UNIV TRIESTE,TRIESTE,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. CIEMAT,E-28040 MADRID,SPAIN. ATOMKI,DEBRECEN,HUNGARY. CUKUROVA UNIV,ADANA,TURKEY. BOSTON UNIV,BOSTON,MA 02215. OAK RIDGE NATL LAB,OAK RIDGE,TN. NPI MOSCOW STATE UNIV,MOSCOW,RUSSIA. KFKI,RMKI,BUDAPEST,HUNGARY. MIDDLE E TECH UNIV,TR-06531 ANKARA,TURKEY. UNIV IOWA,IOWA CITY,IA. RI Kuleshov, Sergey/D-9940-2013; Kim, Soo-Bong/B-7061-2014; Josa, Isabel/K-5184-2014; Pesen, Erhan/B-1753-2017; OI Kuleshov, Sergey/0000-0002-3065-326X; Uliyanov, Alexey/0000-0001-6935-8949; Gershtein, Yuri/0000-0002-4871-5449 NR 22 TC 44 Z9 44 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 202 EP 226 DI 10.1016/S0168-9002(97)00789-4 PG 25 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500005 ER PT J AU Castoldi, A Gatti, E Manzari, V Rehak, P AF Castoldi, A Gatti, E Manzari, V Rehak, P TI Performance of silicon drift detectors in a magnetic field SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CHAMBERS AB A study of the properties of silicon drift detectors in a magnetic field was carried out. A silicon drift detector with 41 anodes, providing unambiguous x and y position information, was used for measurements. Studies were done in three principal orientations of the detector relative to the direction of the magnetic field. The magnetic field was varied between 0 and 0.7 T and the drift field between 300 and 600 V/cm. Basic agreement with the theory of electron transport in semiconductors in a magnetic field was found. The transport properties of electrons in a magnetic field can be described by a mobility matrix. The components of the matrix depend on the electron mobility, Hall mobility and on the vector of the magnetic field. The precision of measurement was better than 0.2% for most of the parameters. For the electric field of a silicon drift detector, there is a first-order effect of the magnetic field only in one out of three principal directions. In this direction, the plane of the detector is perpendicular to the magnetic field and electrons drift at an angle ct relative to the direction of the drift field. In two other principal directions, which are more important for tracking of the particles with drift detectors, there are no first-order magnetic effects. C1 POLITECN MILAN, DIPARTIMENTO ELETTRON, I-20133 MILAN, ITALY. IST NAZL FIS NUCL, I-70124 BARI, ITALY. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. RP Castoldi, A (reprint author), BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 13 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 227 EP 243 DI 10.1016/S0168-9002(97)00909-1 PG 17 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500006 ER PT J AU Uretsky, JL AF Uretsky, JL TI Penetration of cosmic ray muons into the Earth SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB I present a new analytic solution to the integro-differential equation that describes the underground propagation of cosmic ray muons. The exact solution is given in the form of an infinite series in inverse powers of the muon energy. Convergence is proved for sufficiently high energies. The series is shown to be summable in closed form, in certain approximations. The closed forms provides analytic continuations to low energies of the series solution. One approximation resembles a well-known solution that ignores discrete energy loss, but this approximation introduces additional constants. I apply the approximate solution using an expression for the surface muon flux, derived from the primary flux, as a boundary condition. The result predicts the underground muon vertical intensity over seven orders of magnitude (10 km depth), compares favorably with published Monte Carlo calculations, and can be performed in seconds on a personal computer. As an application, the same approximation predicts the ''catastrophic'' energy-loss event rate at Soudan II. RP Uretsky, JL (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 27 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 NOV 11 PY 1997 VL 399 IS 2-3 BP 285 EP 300 DI 10.1016/S0168-9002(97)00996-0 PG 16 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500011 ER PT J AU Lee, HK Suh, TS Choe, BY Shinn, KS Cho, G PerezMendez, V AF Lee, HK Suh, TS Choe, BY Shinn, KS Cho, G PerezMendez, V TI Transient photoconductive gain in a-Si:H devices and its applications in radiation detection SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE photoconductive gain; photocurrent; photoconductivity; a-Si:H; p-i-n photodiode; n-i-n photoconductor ID AMORPHOUS-SILICON; LAYERS; BIAS AB Using the transient behavior of the photoconductive-gain mechanism, a signal gain in radiation detection with a-Si : H devices may be possible. The photoconductive gain mechanism in two types of hydrogenated amorphous silicon devices, p-i-n and n-i-n configurations, was investigated in connection with applications to radiation detection. Photoconductive gain was measured in two time scales: one for short pulses of visible light (< 1 mu s) which simulate the transit of energetic charged particles or gamma-rays, and the other for rather long pulses of light (greater than or equal to 1 ms) which simulate X-ray exposure in medical imaging. The photoconductive gain in our devices could be calculated by comparing the photo-induced signals from n-i-n photoconductors and forward biased p-i-n photodiodes to the maximum signals from corresponding reverse biased p-i-n photodiodes. We used two definitions of photoconductive gain: current gain and charge gain which is an integration of the current gain. We obtained typical charge gains of 3-9 for short pulses and a few hundreds for long pulses at a dark current density level of 10 mA/cm(2). Various gain results are discussed in terms of the device structure, applied bias and dark-current density. C1 KOREA ADV INST SCI & TECHNOL,TAEJON,SOUTH KOREA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP Lee, HK (reprint author), CATHOLIC UNIV,COLL MED,DEPT BIOMED ENGN,505 BANPO DONG,SEOUL 137040,SOUTH KOREA. RI Cho, Gyuseong/C-1527-2011 NR 22 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 324 EP 334 DI 10.1016/S0168-9002(97)00924-8 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500013 ER PT J AU Takashita, H Takahashi, H AF Takashita, H Takahashi, H TI Radiation damage to a transmutation system based on a proton accelerator SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID WASTE TRANSMUTATION; DRIVEN AB We discuss radiation damage to a transmutation system driven by a proton accelerator. The transmuter is composed of a lead target, beam window, structural wall, subcritical core, and reflector. Because of its subcritical condition, neutrons are supplied by the spallation reaction generated by high-energy protons. The spallation neutrons, as well as the fission neutrons, cause the radiation damage. We calculated the atomic displacement, the production rates of hydrogen and helium, and energy deposition, varying the effective multiplication factor (k(eff)) and fuel of the transmuter. To vary k(eff), the thickness of the core was changed. Two types of fuel were investigated. One was He-cooled particle fuel that contains minor actinides (MAs), and the other was Na-cooled mixed-oxide (MOX) fuel. The lead target and the beam window incurred large damages. The structural wall near the beam window also had a large atomic displacement. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP Takashita, H (reprint author), POWER REACTOR & NUCL FUEL DEV CORP,TOKAI WORKS,NUCL FUEL DESIGN SECT,4-33 MURAMATSU,TOKAI,IBARAKI 31911,JAPAN. NR 14 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 421 EP 431 DI 10.1016/S0168-9002(97)00917-0 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500024 ER PT J AU Zhong, Z Chapman, D Thomlinson, W Arfelli, F Menk, R AF Zhong, Z Chapman, D Thomlinson, W Arfelli, F Menk, R TI A bent Laue crystal monochromator for monochromatic radiography with an area beam SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE radiography; bent crystal monochromator; glitch ID X-RAY SOURCE; SYNCHROTRON-RADIATION AB A bent Laue crystal monochromator which can diffract a large area of monochromatic X-rays from a polyenergetic X-ray rotating-anode source has been developed at the National Synchrotron Light Source (NSLS). The monochromatic beam, with a solid angle of more than 5 degrees x 5 degrees and energy range tunable from 15 to 100keV, is completely separated from the white beam at a distance of less than Im from the source. The absolute reflectivity of the monochromator ranges from 10% to 40% (depending on the energy of the X-rays being diffracted and the source size). The energy bandwidth of around 2% is controllable by varying the diffraction planes used, the crystal thickness, asymmetry angle and the bending radius. A single emission line from an X-ray tube source can be selectively diffracted into the entire exit-beam solid angle. Potential applications of the device in clinical radiography are discussed. C1 IIT,CSRRI,CHICAGO,IL 60616. IST NAZL FIS NUCL,SOC SINCROTRONE TRIESTE & SEZ,I-34012 TRIESTE,ITALY. UNIV GESAMTHSCH SIEGEN,D-57068 SIEGEN,GERMANY. RP Zhong, Z (reprint author), BROOKHAVEN NATL LAB,BLDG 725D,UPTON,NY 11973, USA. NR 18 TC 8 Z9 9 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 11 PY 1997 VL 399 IS 2-3 BP 489 EP 498 DI 10.1016/S0168-9002(97)00969-8 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YF195 UT WOS:A1997YF19500030 ER PT J AU Pedersen, PS AF Pedersen, PS TI Cauchy's integral theorem on a finitely generated, real, commutative, and associative algebra SO ADVANCES IN MATHEMATICS LA English DT Article AB Let R[alpha] = R[alpha(1), alpha(2), ..., alpha(n)] (where alpha(1) = 1) be a real, unitary, finitely generated, commutative, and associative algebra. We consider functions f(z) = f(Sigma(i=1)(n) x(i) alpha(i)) which map R[alpha](n) = {Sigma(i=1)(n) a(i) alpha(i) \ 1 less than or equal to i less than or equal to n, a(i) is an element of R} into R[alpha] = finite dimensional subspaces of {Sigma(k is an element of N0n) b(k) alpha(k) \ b(k) is an element of R, k = (k(1), ..., k(n)) is an element of N-0(n)} where N-0 = {0, 1, 2, ...}. We impose a total order on an algorithmically defined basis B For R[alpha]. The resulting algebra and ordered basis will be written as (R[alpha], <). We then use this basis to define a norm parallel to.parallel to on (R[alpha], < ). Continuous functions, differentiable functions, and the concept of Riemann integration will then be defined and discussed in this new setting. We then show that integral(y)f(z) dz = 0 when f(z) is a continuous and differentiable function defined in a simply connected region G subset of R[alpha](n) subset of (R[alpha], <)containing the closed path y. (C) 1997 Academic Press. RP Pedersen, PS (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0001-8708 J9 ADV MATH JI Adv. Math. PD NOV 10 PY 1997 VL 131 IS 2 BP 344 EP 356 DI 10.1006/aima.1997.1671 PG 13 WC Mathematics SC Mathematics GA YJ092 UT WOS:A1997YJ09200002 ER PT J AU Lubben, D Eres, G Jellison, GE Westbrook, RD Wood, RF AF Lubben, D Eres, G Jellison, GE Westbrook, RD Wood, RF TI Growth and doping of Si layers by molecular-jet chemical vapor deposition: Device fabrication SO APPLIED PHYSICS LETTERS LA English DT Article ID DOPED EPITAXIAL SILICON; LOW-TEMPERATURES; SOLAR-CELLS AB Homoepitaxial Si films doped both n- and p-type were deposited by molecular-jet chemical vapor deposition (CVD) from 10% Si2H6 in H-2. Doping was accomplished from the background using PH3 for n-type and B2H6 for p-type. The dopant concentration was controlled over four orders of magnitude (10(15)-10(19) cm(-2)) for films deposited between 650 and 800 degrees C, and n-type films had significantly higher growth rates and doping levels compared to films deposited by very-low pressure CVD at equal Si2H6 throughput in the same reactor. Even without optimization, solar cells constructed from these films had open-circuit voltages and short-circuit currents as high as 490 mV and 21 mA cm(-2), respectively, with fill factors as high as 70%. (C) 1997 American Institute of Physics. [S0003-6951(97)03045-3]. RP Lubben, D (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,MS 6030,OAK RIDGE,TN 37831, USA. RI Eres, Gyula/C-4656-2017 OI Eres, Gyula/0000-0003-2690-5214 NR 14 TC 2 Z9 2 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 10 PY 1997 VL 71 IS 19 BP 2812 EP 2814 DI 10.1063/1.120194 PG 3 WC Physics, Applied SC Physics GA YE753 UT WOS:A1997YE75300030 ER PT J AU Middleditch, J Imamura, JN SteimanCameron, TY AF Middleditch, J Imamura, JN SteimanCameron, TY TI Discovery of quasi-periodic oscillations in the AM Herculis object BL Hydri SO ASTROPHYSICAL JOURNAL LA English DT Article DE accretion, accretion disks; novae, cataclysmic variables; stars, individual (BL Hydri, H0139-68); stars, oscillations ID DRIVEN RADIATIVE SHOCKS; WHITE-DWARFS; VARIABILITY AB We obtained high-speed optical photometry of the AM Her object BL Hyi at the Las Campanas Observatory and the Cerro Tololo Inter-American Observatory during 1989-1996. BL Hyi was in its faint-luminosity state in 1989; it subsequently brightened and was in its high-luminosity state for our 1994-1996 observations. We discovered broad, 0.2-0.8 Hz quasi-periodic oscillations (QPOs) and narrower QPOs superposed on the broad QPOs when BL Hyi was in its high-luminosity state. The broad QPOs had widths of Delta f/f(p) similar to 0.5-1 and rms pulsed amplitudes of similar to 1%-4%, wheref(p) is the frequency of the QPO peak. The narrow QPOs had widths of Delta f/f(p) < 0.1 and rms pulsed amplitudes of less than 1%. BL Hyi showed stronger QPOs and was slightly brighter in 1994 than in 1995-1996. The amplitudes of the broad and narrow QPOs were modulated on the orbital period of the system; they were strongest during the bright orbital phase. BL Hyi is the fifth AM Her system to show the short-period QPOs discovered by Middleditch. C1 UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA. UNIV OREGON, INST THEORET SCI, EUGENE, OR 97403 USA. NASA, AMES RES CTR, MS 245 3, MOFFETT FIELD, CA 94035 USA. RP Middleditch, J (reprint author), LOS ALAMOS NATL LAB, COMP INFORMAT & COMMUN DIV, MS B256, CIC 19, POB 1663, LOS ALAMOS, NM 87545 USA. NR 18 TC 11 Z9 11 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1997 VL 489 IS 2 BP 912 EP 916 DI 10.1086/304834 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YF300 UT WOS:A1997YF30000036 ER PT J AU Kibedi, T Kerr, M Norman, EB Dracoulis, GD Byrne, AP AF Kibedi, T Kerr, M Norman, EB Dracoulis, GD Byrne, AP TI beta(-) decay and cosmic-ray half-life of Mn-54 SO ASTROPHYSICAL JOURNAL LA English DT Article DE cosmic rays; nuclear reactions, nucleosynthesis, abundances ID ELECTRON-CAPTURE DECAY; ISOTOPIC COMPOSITION; PROPAGATION; NUCLEI; NICKEL AB A superconducting solenoid electron spectrometer operated in the lens mode was adapted to search for the beta(-) decay of Mn-54. The Compton electron and other instrumental backgrounds were largely reduced by special shielding of the absorber system. An improved procedure was developed to select the events by momenta. An upper limit of less than 3.9 x 10(-5) has been established for the intensity of the beta(-)branch. This would define the partial half-life of the Mn-54 beta(-) decay to be greater than 2.2 x 10(4) yr. The implications of this result for the Mn-54 cosmic-ray chronometry problem are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP Kibedi, T (reprint author), AUSTRALIAN NATL UNIV,RES SCH PHYS SCI & ENGN,DEPT NUCL PHYS,CANBERRA,ACT 0200,AUSTRALIA. RI Dracoulis, George/A-8123-2008; Kibedi, Tibor/E-8282-2010; OI Kibedi, Tibor/0000-0002-9205-7500; Byrne, Aidan/0000-0002-7096-6455 NR 26 TC 6 Z9 6 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1997 VL 489 IS 2 BP 951 EP 959 DI 10.1086/304790 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YF300 UT WOS:A1997YF30000041 ER PT J AU Cerqueira, AH DalPino, EMD Herant, M AF Cerqueira, AH DalPino, EMD Herant, M TI Magnetic field effects on the head structure of protostellar jets SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, jets and outflows; MHD; stars, mass loss; stars, pre-main-sequence ID HERBIG-HARO OBJECTS; YOUNG STELLAR OBJECTS; NUMERICAL SIMULATIONS; 3-DIMENSIONAL SIMULATIONS; STABILITY; MODELS; FLOWS; STARS AB We present the results of three-dimensional smooth particle magnetohydrodynamics numerical simulations of supermagnetosonic, overdense, radiatively cooling jets. Together with a baseline nonmagnetic calculation, two initial magnetic configurations (in approximate equipartition with the gas) are considered: (1) a helical field and (2) a longitudinal field, both of which permeate both the jet and the ambient medium. We find that magnetic fields have important effects on the dynamics and structure of radiative cooling jets, especially at the head. The presence of a helical field suppresses the formation of the clumpy structure that is found to develop at the head of purely hydrodynamical jets by fragmentation of the cold shell of shocked material. On the other hand, a cooling jet embedded in a longitudinal magnetic field retains clumpy morphology at its head. This fragmented structure resembles the knotty pattern commonly observed in HH objects behind the bow shocks of protostellar jets. This suggests that a strong (equipartition) helical magnetic field configuration is ruled out at the jet head. Therefore, if strong magnetic fields are present, they are probably predominantly longitudinal in those regions. In both magnetic configurations, we find that the confining pressure of the cocoon is able to excite short-wavelength MHD Kelvin-Helmholtz pinch modes that drive low-amplitude internal shocks along the beam. These shocks are not strong however, and it is likely that they could only play a secondary role in the formation of the bright knots observed in protostellar jets. C1 LOS ALAMOS NATL LAB, DIV THEORY, LOS ALAMOS, NM 87545 USA. RP Cerqueira, AH (reprint author), UNIV SAO PAULO, INST ASTRON & GEOFIS, AV MIGUEL STEFANO 4200, BR-04301904 SAO PAULO, BRAZIL. RI Cerqueira, Adriano/D-2534-2011; de Gouveia Dal Pino, Elisabete/H-9560-2013 OI Cerqueira, Adriano/0000-0003-3708-1564; de Gouveia Dal Pino, Elisabete/0000-0001-8058-4752 NR 33 TC 34 Z9 34 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1997 VL 489 IS 2 BP L185 EP + DI 10.1086/316791 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YF301 UT WOS:A1997YF30100016 ER PT J AU Liu, WH Jeffery, DJ Schultz, DR Quinet, P Shaw, J Pindzola, MS AF Liu, WH Jeffery, DJ Schultz, DR Quinet, P Shaw, J Pindzola, MS TI Emission from cobalt in Type Ia supernovae SO ASTROPHYSICAL JOURNAL LA English DT Article DE supernovae, general; atomic processes; atomic data ID ENERGY DEPOSITION AB Nebular spectra of Type Ia supernovae are modelled by including the forbidden lines of cobalt ions for which the radiative transition probabilities and effective collision strengths have recently been calculated. As a result, the agreement between the synthetic and observed spectra is significantly improved in the early nebular phase when cobalt is as abundant as iron in the supernovae. Strong cobalt emission lines are identified in the supernova spectra, which provides a direct spectroscopic evidence for the radioactive decay of Ni-56-->Co-56-->Fe-56 that powers the supernovae. C1 UNIV MONS,DEPT ASTROPHYS & SPECTROSCOPIE,B-7000 MONS,BELGIUM. AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849. RP Liu, WH (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 16 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 NOV 10 PY 1997 VL 489 IS 2 BP L141 EP L143 DI 10.1086/316790 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YF301 UT WOS:A1997YF30100006 ER PT J AU Truelove, JK Klein, RI McKee, CF Holliman, JH Howell, LH Greenough, JA AF Truelove, JK Klein, RI McKee, CF Holliman, JH Howell, LH Greenough, JA TI The jeans condition. A new constraint on spatial resolution in simulations of isothermal self-gravitational hydrodynamics SO ASTROPHYSICAL JOURNAL LA English DT Article DE gravitation; hydrodynamics; ISM, clouds; methods, numerical; stars, formation ID FRAGMENTATION; CORES AB We demonstrate with a new three-dimensional adaptive mesh refinement code that perturbations arising from discretization of the equations of self-gravitational hydrodynamics can grow into fragments in multiple-grid simulations, a process we term ''artificial fragmentation.'' We present star formation calculations of isothermal collapse of dense molecular cloud cores. In simulation of a Gaussian-profile cloud free of applied perturbations, we find artificial fragmentation can be avoided across the isothermal density regime by ensuring the ratio of cell size to Jeans length, which we call the Jeans number, J drop Delta x/lambda(J), is kept below 0.25. We refer to the constraint that lambda(J) be resolved as the Jeans condition. When an m = 2 perturbation is included, we again find it necessary to keep J less than or equal to 0.25 to achieve a converged morphology. Collapse to a filamentary singularity occurs without fragmentation of the filament, in agreement with the predictions of Inutsuka & Miyama. Simulation beyond the time of this singularity requires an arresting agent to slow the runaway density growth. Physically, the breakdown of isothermality due to the buildup of opacity acts as this agent, but many published calculations have instead used artificial viscosity for this purpose. Because artificial viscosity is resolution dependent, such calculations produce resolution-dependent results. In the context of the perturbed Gaussian cloud, we show that use of artificial viscosity to arrest collapse results in significant violation of the Jeans condition. We also show that if the applied perturbation is removed from such a calculation, numerical fluctuations grow to produce substantial fragments not unlike those found when the perturbation is included. These findings indicate that calculations that employ artificial viscosity to halt collapse are susceptible to contamination by artificial fragmentation. The Jeans condition has important implications for numerical studies of isothermal self-gravitational hydrodynamics problems insofar as it is a necessary but not, in general, sufficient condition for convergence. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR COMPUTAT SCI & ENGN,BERKELEY,CA 94720. RP Truelove, JK (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,601 CAMPBELL HALL,BERKELEY,CA 94720, USA. NR 16 TC 378 Z9 378 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1997 VL 489 IS 2 BP L179 EP & DI 10.1086/310975 PN 2 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA YF301 UT WOS:A1997YF30100015 ER PT J AU Ahluwalia, DV AF Ahluwalia, DV TI Notes on the kinematic structure of the three-flavor neutrino oscillation framework SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID NUCLEAR-POWER-REACTOR; QUANTUM-FIELD THEORY; UPPER LIMIT; SOLAR; PHYSICS; PARTICLES; MASS; CONSTRUCT; DEFICIT; CLUSTER AB These notes present a critique of the standard three-flavor neutrino oscillation framework. The design proposal of the MINOS at Fermilab based on a two-mass eigenstate framework may require serious reconsideration if there is strong mixing between all three flavors of neutrinos. For the LSND and KARMEN neutrino oscillation experiments, the amplitude of neutrino oscillation of the ''one mass scale dominance'' framework vanishes for certain values of mixing angles as a result of opposite signs of two equal and opposite contributions. Recent astronomical observations leave open the possibility that one of the neutrino mass eigenstates may be nonrelativistic in some instances. Neutrino oscillation phenomenology with a superposition of two relativistic, and one nonrelativistic, mass eigenstates is constructed. It is concluded that if the transition from the nonrelativistic to the relativistic regime happens for energies relevant to the reactor and the LSND neutrino oscillation experiments, then one must consider an ab initio analysis of the existing data. C1 ANSER INC, GLOBAL POWER DIV, ARLINGTON, VA 22202 USA. RP LOS ALAMOS NATL LAB, DIV PHYS P25, H 846, LOS ALAMOS, NM 87545 USA. NR 67 TC 7 Z9 7 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-751X EI 1793-656X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD NOV 10 PY 1997 VL 12 IS 28 BP 5081 EP 5101 DI 10.1142/S0217751X97002711 PG 21 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA YG580 UT WOS:A1997YG58000007 ER PT J AU Devaux, JP Schubert, G Anderson, C AF Devaux, JP Schubert, G Anderson, C TI Formation of a metastable olivine wedge in a descending slab SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SUBDUCTING LITHOSPHERE; PHASE-TRANSFORMATIONS; SPINEL TRANSFORMATION; DEEP EARTHQUAKES; TRANSITION; KINETICS; MANTLE AB We present a thermal model of a descending slab in which the transformation of olivine to spinel is controlled by pressure-and temperature-dependent reaction kinetics. Two different formulations of the kinetics are considered with the main discriminant being the temperature range over which olivine converts to spinel at pressures of about 15 GPa (about 500 degrees-515 degrees C and 560 degrees-650 degrees C). We use a finite element method to solve the coupled heat conduction (perpendicular and parallel to the dip of the slab) and kinetics equations, and we include the latent heat of the phase transformation. Latent heat release together with beat conduction parallel to the dip of the slab reduces significantly the length of the metastable olivine wedge and results in a very thin (less than or similar to 5 km) two-phase region. We employ the thermal parameter v tau sin delta (v is the velocity of the descending slab, tau is the age of the slab, and delta is the dip of the slab to the horizontal) to interpret the results for the length of the metastable wedge. For values of the thermal parameter smaller than about 4000 and 7000 km, depending on the model of the kinetics, no metastable olivine wedge exists (the critical value of 7000 km for the thermal parameter corresponds to the kinetics model with the lowest transition temperature range). The length of the metastable olivine wedge is also found to be very sensitive to the model of the kinetics and to the effects of adiabatic heating. If the occurrence of deep earthquakes is related to the transformation of metastable olivine to spinel, then data on earthquake depth versus thermal parameter require that the onset of the reaction takes place at temperatures of about 550 degrees-575 degrees C. In this case the slab thermal parameter must be larger than 10,000 km for the metastable olivine wedge to extend down to 660 km depth. But deep earthquakes occur near 660 km depth in slabs with thermal parameter as small as about 5000 km (South America, for example). Either some deep earthquakes are unrelated to olivine metastability or our knowledge of olivine-spinel reaction kinetics is incomplete. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV CALIF LOS ANGELES, INST GEOPHYS & PLANETARY PHYS, LOS ANGELES, CA 90024 USA. RP Devaux, JP (reprint author), UNIV CALIF LOS ANGELES, DEPT EARTH & SPACE SCI, BOX 951567, LOS ANGELES, CA 90095 USA. NR 26 TC 37 Z9 38 U1 1 U2 3 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 NOV 10 PY 1997 VL 102 IS B11 BP 24627 EP 24637 DI 10.1029/97JB02334 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA YF511 UT WOS:A1997YF51100016 ER PT J AU Blair, SC Berge, PA Berryman, JG AF Blair, SC Berge, PA Berryman, JG TI Using two-point correlation functions to characterize microgeometry and estimate permeabilities of sandstones and porous glass - Reply SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Editorial Material ID 2-POINT CORRELATION-FUNCTIONS; FLUID PERMEABILITY; MEDIA RP Blair, SC (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94551 USA. RI Berryman, James/A-9712-2008 NR 6 TC 1 Z9 1 U1 3 U2 5 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 NOV 10 PY 1997 VL 102 IS B11 BP 24813 EP 24813 DI 10.1029/97JB01386 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA YF511 UT WOS:A1997YF51100029 ER PT J AU Abele, A Adomeit, J Armstrong, DS Baker, CA Batty, CJ Benayoun, M Berdoz, A Beuchert, K Bischoff, S Blum, P Braune, K Bugg, DV Case, T Cooper, AR Cramer, O Crowe, KM Dietz, HP Djaoshvili, N Dunnweber, W Engelhardt, D Englert, M Faessler, MA Haddock, RP Heinsius, FH Herz, M Hessey, NP Hidas, P Holtzhaussen, C Illinger, P Jamnik, D Kammle, B Kammel, P Kiel, T Koch, H Kolo, C Lakata, M Matthay, H McCrady, R Meier, J Meyer, CA Montanet, L Pinder, CN Pinter, G Regenfus, C Reissmann, J Rothel, W Sarantsev, AV Schmidt, P Scott, I Seibert, R Strassburger, C Strohbusch, U Suffert, M Thoma, U Tischhauser, M Volcker, C Walther, D Zou, B AF Abele, A Adomeit, J Armstrong, DS Baker, CA Batty, CJ Benayoun, M Berdoz, A Beuchert, K Bischoff, S Blum, P Braune, K Bugg, DV Case, T Cooper, AR Cramer, O Crowe, KM Dietz, HP Djaoshvili, N Dunnweber, W Engelhardt, D Englert, M Faessler, MA Haddock, RP Heinsius, FH Herz, M Hessey, NP Hidas, P Holtzhaussen, C Illinger, P Jamnik, D Kammle, B Kammel, P Kiel, T Koch, H Kolo, C Lakata, M Matthay, H McCrady, R Meier, J Meyer, CA Montanet, L Pinder, CN Pinter, G Regenfus, C Reissmann, J Rothel, W Sarantsev, AV Schmidt, P Scott, I Seibert, R Strassburger, C Strohbusch, U Suffert, M Thoma, U Tischhauser, M Volcker, C Walther, D Zou, B TI Further analysis of (p)over-bar-p->3 pi(0), eta eta pi(0) and eta pi(0)pi(0) at rest (vol 609, pg 562, 1996) SO NUCLEAR PHYSICS A LA English DT Correction, Addition C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV BOCHUM,D-44780 BOCHUM,GERMANY. UNIV BONN,D-53115 BONN,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 LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. LPNHE PARIS 6,D-80799 MUNICH,GERMANY. LPNHE PARIS 7,D-80799 MUNICH,GERMANY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RP Abele, A (reprint author), UNIV KARLSRUHE,D-76021 KARLSRUHE,GERMANY. NR 1 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD NOV 10 PY 1997 VL 625 IS 4 BP 899 EP 900 PG 2 WC Physics, Nuclear SC Physics GA YK790 UT WOS:A1997YK79000012 ER PT J AU ArkaniHamed, N Feng, JL Hall, LJ Cheng, HC AF ArkaniHamed, N Feng, JL Hall, LJ Cheng, HC TI CP violation from slepton oscillations at the LHC and NLC SO NUCLEAR PHYSICS B LA English DT Article ID LINEAR E(+)E(-) COLLIDERS; DYNAMICAL SUPERSYMMETRY BREAKING; STANDARD MODEL; PHYSICS AB In supersymmetric theories the charged sleptons of different generations may oscillate amongst themselves while they decay. In the case of three generation oscillations, superpartner production at the LHC and NLC may lead to an observable CP-vioIating signal N('e(+)mu(-)) -N(mu(+)e(-)). This signal is proportional to a CP-violating invariant of the slepton mass matrix, (J) over tilde, which is not constrained by searches for the electric dipole moment of the electron. The sensitivity of the LHC and NLC to this signal is highly dependent on superpartner masses, but (J) over tilde may be probed to a level of 10(-3). Observation of the CP-violating signal would imply a definite structure for the slepton mass matrices and have strong implications for models of flavor and SUSY breaking. (C) 1997 Elsevier Science B.V. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP ArkaniHamed, N (reprint author), UNIV CALIF BERKELEY,LBNL,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 40 TC 79 Z9 79 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 NOV 10 PY 1997 VL 505 IS 1-2 BP 3 EP 39 DI 10.1016/S0550-3213(97)00433-1 PG 37 WC Physics, Particles & Fields SC Physics GA YG547 UT WOS:A1997YG54700001 ER PT J AU Bardakci, K Bernardo, LM AF Bardakci, K Bernardo, LM TI String field equations from the generalized sigma model SO NUCLEAR PHYSICS B LA English DT Article DE renormalization group; generalized sigma model; background field ID RENORMALIZATION-GROUP; WILSON AB We propose a new approach for deriving the string field equations from a general sigma model on the world-sheet, This approach leads to an equation which combines some of the attractive features of both the renormalization group method and the covariant beta function treatment of the massless excitations. It has the advantage of being covariant under a very general set of both local and non-local transformations in the field space. We apply it to the tachyon, massless and first massive level, and show that the resulting field equations reproduce the correct spectrum of a left-right symmetric closed bosonic string. (C) 1997 Elsevier Science B.V. C1 LAWRENCE BERKELEY LAB, THEORET PHYS GRP, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 20 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD NOV 10 PY 1997 VL 505 IS 1-2 BP 463 EP 496 DI 10.1016/S0550-3213(97)00320-9 PG 34 WC Physics, Particles & Fields SC Physics GA YG547 UT WOS:A1997YG54700021 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolognesi, V Bolla, G Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, R Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuwabara, T Kuhlmann, SE Kuns, E Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Mathews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F AzziBacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J deBarbaro, P BarbaroGaltieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolognesi, V Bolla, G Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N BuckleyGeer, E Budd, HS Burkett, K Busetto, G ByonWagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D CroninHennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S DellAgnello, S DellOrso, R Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O GarciaSciveres, M Garfinkel, AF Gay, C Geer, S Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L GrossoPilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuwabara, T Kuhlmann, SE Kuns, E Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Mathews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D NewmanHolmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, W Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R ThurmanKeup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W deTroconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J vandenBrink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S TI The mu tau and e tau decays of top quark pairs produced in p(p)over-bar collisions at root s = 1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID (P)OVER-BAR-P COLLISIONS; DETECTOR; PHYSICS; ENERGY AB We present a search for dilepton events from t (t) over bar production with one electron or muon and one hadronically decaying tau lepton from the decay t (t) over bar --> (l nu(l))(tau nu(tau))b (b) over bar, (l = e, mu)(-), using the Collider Detector at Fermilab. In a 109 pb(-1) data sample of p (p) over bar collisions at root s = 1.8 TeV we expect similar to 1 signal event and a total background of similar to 2 events; we observe 4 candidate events (2 e tau and 2 mu tau). Three of these events have jets identified as b candidates, compared to an estimated background of 0.28 +/- 0.02 events. [S0031-9007(97)04295-6]. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40127 BOLOGNA,ITALY. BRANDEIS UNIV,WALTHAM,MA 02264. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60638. DUKE UNIV,DURHAM,NC 28708. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV FLORIDA,GAINESVILLE,FL 33611. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV GENEVA,CH-1211 GENEVA 4,SWITZERLAND. HARVARD UNIV,CAMBRIDGE,MA 02138. HIROSHIMA UNIV,HIGASHIHIROSHIMA 724,JAPAN. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ H3A 2T8,CANADA. UNIV TORONTO,TORONTO,ON M5S 1A7,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV KARLSRUHE,D-76128 KARLSRUHE,GERMANY. NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 315,JAPAN. ERNESTO ORLANDO LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV NEW MEXICO,ALBUQUERQUE,NM 87132. OHIO STATE UNIV,COLUMBUS,OH 43210. OSAKA CITY UNIV,OSAKA 588,JAPAN. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-36132 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV PITTSBURGH,PITTSBURGH,PA 15270. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14628. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. ACAD SINICA,TAIPEI 11530,TAIWAN. TEXAS A&M UNIV,COLLEGE STN,TX 77843. TEXAS TECH UNIV,LUBBOCK,TX 79409. UNIV TSUKUBA,TSUKUBA,IBARAKI 315,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53806. YALE UNIV,NEW HAVEN,CT 06511. RP Abe, F (reprint author), NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 315,JAPAN. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014; Introzzi, Gianluca/K-2497-2015 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787; Introzzi, Gianluca/0000-0002-1314-2580 NR 12 TC 33 Z9 33 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3585 EP 3590 DI 10.1103/PhysRevLett.79.3585 PG 6 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600011 ER PT J AU vonSmekal, L Hauck, A Alkofer, R AF vonSmekal, L Hauck, A Alkofer, R TI Infrared behavior of gluon and ghost propagators in Landau gauge QCD SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCHWINGER-DYSON EQUATIONS; QUANTUM CHROMODYNAMICS; MULTIPLICATIVE RENORMALIZABILITY; NONPERTURBATIVE CONFINEMENT; LATTICE; MANDELSTAM; PHYSICS; VERTEX; LAW AB A truncation scheme for the Dyson-Schwinger equations of Euclidean QCD in Landau gauge is presented. It implements the Slavnov-Taylor identities for the three-gluon and ghost-gluon vertices, whereas irreducible four-gluon couplings as well as the gluon-ghost and ghost-ghost scattering kernels are neglected. The infrared behavior of gluon and ghost propagators is obtained analytically: The gluon propagator vanishes for small momenta, whereas the ghost propagator diverges strongly. The numerical solutions are compared with recent lattice results. The running coupling approaches a fixed point, alpha(c) similar or equal to 9.5, in the infrared. [S0031-9007(97)04470-0]. C1 UNIV TUBINGEN,INST THEORET PHYS,D-72076 TUBINGEN,GERMANY. RP vonSmekal, L (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 24 TC 296 Z9 297 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3591 EP 3594 DI 10.1103/PhysRevLett.79.3591 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600012 ER PT J AU Blum, T Soni, A AF Blum, T Soni, A TI Domain wall quarks and kaon weak matrix elements SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHIRAL FERMIONS; LATTICE; QCD AB We present lattice calculations of kaon matrix elements with domain wall fermions. Using lattices with 6/g(2) = 5.85, 6.0, and 6.3, we estimate B-K(mu approximate to 2 GeV) = 0.628(47) in quenched QCD, which is consistent with previous calculations. At 6/g(2) = 6.0 and 5.85 we find the ratio f(K)/m(rho), in agreement with the experimental value, within errors. These results support expectations that O(a) errors are exponentially suppressed in low energy (E << a(-1)) observables, and indicate that domain wall fermions have good scaling behavior at relatively strong couplings. We also demonstrate that the axial current numerically satisfies the lattice analog of the usual continuum axial Ward identity. [S0031-9007(97)04682-6]. RP Blum, T (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 14 TC 70 Z9 70 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3595 EP 3598 DI 10.1103/PhysRevLett.79.3595 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600013 ER PT J AU Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Prell, S Sharma, V Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A ValantSpaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, R Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ AF Barish, B Chadha, M Chan, S Eigen, G Miller, JS OGrady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Prell, S Sharma, V Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A ValantSpaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ ONeill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, R Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ TI First observation of inclusive B decays to the charmed strange baryons xi(0)(c) and xi(+)(c) SO PHYSICAL REVIEW LETTERS LA English DT Article ID MESON DECAYS; EXCLUSIVE DECAYS; ANTIBARYON PAIRS; BOTTOM MESONS; LIFETIME; C+; A+ AB Using data collected in the region of the Upsilon(4S) resonance with the CLEO II detector operating at the Cornell Electron Storage Ring (CESR), we present the first observation of B mesons decaying into the charmed strange baryons Xi(c)(0) and Xi(c)(+). We find 79 +/- 27 Xi(c)(0) and 125 +/- 28 Xi(c)(+) candidates from B decays, leading to product branching fractions of B((B) over bar --> Xi(c)(0)X)B(Xi(c)(0) --> Xi(-)pi(+)) = (0.144 +/- 0.048 +/- 0.021) X 10(-3) and B((B) over bar --> Xi(c)(+)X)B(Xi(C)(+) --> Xi(-)pi(+)pi(+)) = (0.453 +/- 0.096(+0.085)(-0.065)) X 10(-3). [S0031-9007(97)04481-5]. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV COLORADO,BOULDER,CO 80309. CORNELL UNIV,ITHACA,NY 14853. UNIV FLORIDA,GAINESVILLE,FL 32611. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV HAWAII MANOA,HONOLULU,HI 96822. UNIV ILLINOIS,CHAMPAIGN,IL 61801. CARLETON UNIV,OTTAWA,ON K1S 5B6,CANADA. INST PARTICLE PHYS,MONTREAL,PQ,CANADA. MCGILL UNIV,MONTREAL,PQ H3A 2T8,CANADA. ITHACA COLL,ITHACA,NY 14850. UNIV KANSAS,LAWRENCE,KS 66045. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. SUNY ALBANY,ALBANY,NY 12222. OHIO STATE UNIV,COLUMBUS,OH 43210. UNIV OKLAHOMA,NORMAN,OK 73019. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. SO METHODIST UNIV,DALLAS,TX 75275. SYRACUSE UNIV,SYRACUSE,NY 13244. RP Barish, B (reprint author), CALTECH,PASADENA,CA 91125, USA. RI Briere, Roy/N-7819-2014; Frasconi, Franco/K-1068-2016 OI Briere, Roy/0000-0001-5229-1039; Frasconi, Franco/0000-0003-4204-6587 NR 28 TC 12 Z9 12 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3599 EP 3603 DI 10.1103/PhysRevLett.79.3599 PG 5 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600014 ER PT J AU Armstrong, TA Barish, KN Bennett, MJ Bennett, SJ Chikanian, A Coe, SD Cormier, TM Davies, R DeCataldo, G Dee, P Diebold, GE Dover, CB Fachini, P Finch, LE George, NK Giglietto, N Greene, SV Haridas, P Hill, JC Hirsch, AS Hoversten, RA Huang, HZ Kim, B Kumar, BS Lainis, T Lajoie, JG Lewis, RA Li, Q Libby, B Majka, RD Munhoz, MG Nagle, JL Pless, LA Pope, JK Porile, NT Pruneau, CA Rabin, MSZ Raino, A Reid, JD Rimai, A Rotondo, FS Sandweiss, J Scharenberg, RP Slaughter, AJ Smith, GA Spinelli, P Srivastava, BK Tincknell, ML Toothacker, WS VanBuren, G Wilson, WK Wohn, FK Wolin, EJ Xu, Z Zhao, K AF Armstrong, TA Barish, KN Bennett, MJ Bennett, SJ Chikanian, A Coe, SD Cormier, TM Davies, R DeCataldo, G Dee, P Diebold, GE Dover, CB Fachini, P Finch, LE George, NK Giglietto, N Greene, SV Haridas, P Hill, JC Hirsch, AS Hoversten, RA Huang, HZ Kim, B Kumar, BS Lainis, T Lajoie, JG Lewis, RA Li, Q Libby, B Majka, RD Munhoz, MG Nagle, JL Pless, LA Pope, JK Porile, NT Pruneau, CA Rabin, MSZ Raino, A Reid, JD Rimai, A Rotondo, FS Sandweiss, J Scharenberg, RP Slaughter, AJ Smith, GA Spinelli, P Srivastava, BK Tincknell, ML Toothacker, WS VanBuren, G Wilson, WK Wohn, FK Wolin, EJ Xu, Z Zhao, K TI Search for charged strange quark matter produced in 11.5A GeV/c Au+Pb collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; GLUON PLASMA; DROPLETS; SEPARATION; NUCLEATION; PARTICLES; DROPS AB We present results of a search for strange quark matter (strangelets) in 11.5A GeV/c Au + Pb collisions from the 1994 and 1995 runs of experiment E864 at Brookhaven's Alternating Gradient Synchrotron. We observe no strangelet candidates and set a 90% confidence level upper limit of approximately 3 X 10(-8) per 10% central interaction for the production of \Z\ = 1 and \Z\ = 2 strangelets over a large mass range and with metastable lifetimes of about 50 ns or more. These results place constraints primarily on quark-gluon plasma based production models for strangelets. [S0031-9007(97)04465-7]. C1 UNIV BARI,IST NAZL FIS NUCL,BARI,ITALY. PENN STATE UNIV,UNIVERSITY PK,PA 16802. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90095. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV MASSACHUSETTS,AMHERST,MA 01003. MIT,CAMBRIDGE,MA 02139. PURDUE UNIV,W LAFAYETTE,IN. US MIL ACAD,W POINT,NY 10996. VANDERBILT UNIV,NASHVILLE,TN 37235. WAYNE STATE UNIV,DETROIT,MI 48201. YALE UNIV,NEW HAVEN,CT 06520. RI giglietto, nicola/I-8951-2012 OI giglietto, nicola/0000-0002-9021-2888 NR 30 TC 40 Z9 40 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3612 EP 3616 DI 10.1103/PhysRevLett.79.3612 PG 5 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600017 ER PT J AU Braun, OM Bishop, AR Roder, J AF Braun, OM Bishop, AR Roder, J TI Hysteresis in the underdamed driven Frenkel-Kontorova model SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINE-GORDON EQUATION; DIFFUSIVITY; NUCLEATION; DYNAMICS; MOTION; SYSTEM; KINKS AB We study a commensurate chain of atoms subject to a periodic substrate potential, damping, and a thermal bath, and driven by an external dc force. In the underdamped case the average system velocity as a function of adiabatically varying force exhibits hysteresis at nonzero temperatures. The hysteresis exists due to the instability of the driven motion of kinks at high velocities. In the force-decreasing process, the system passes through two regimes: the ''cavity-mode'' regime (a standing wave superimposed on the state of running atoms) and the ''traffic-jam'' regime, where the mobility is due to kink-antikink pairs, the kinks being bunched into compact groups. [S0031-9007(97)0443O-X]. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UKRAINIAN ACAD SCI,INST PHYS,UA-252022 KIEV,UKRAINE. RP Braun, OM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 20 TC 81 Z9 81 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3692 EP 3695 DI 10.1103/PhysRevLett.79.3692 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600037 ER PT J AU Kosugi, M Matsuda, Y Gaifullin, MB Bulaevskii, LN Chikumoto, N Konczykowski, M Shimoyama, J Kishio, K Hirata, K Kumagai, K AF Kosugi, M Matsuda, Y Gaifullin, MB Bulaevskii, LN Chikumoto, N Konczykowski, M Shimoyama, J Kishio, K Hirata, K Kumagai, K TI Coupling transition of the vortex liquid in Bi2Sr2CaCu2O8+delta with columnar defects SO PHYSICAL REVIEW LETTERS LA English DT Article ID AXIS PLASMA RESONANCE; SUPERCONDUCTORS; CRYSTALS; PHASE; FIELD AB The interlayer Josephson coupling in the vortex fluid phase of heavy-ion irradiated Bi2Sr2CaCu2O8+delta is probed by Josephson plasma resonance. The introduction of columnar defects changes the nature of the vortex liquid dramatically. We show that two types of vortex liquid, the well-coupled and the decoupled pancake vortex liquids, appear in the irradiated crystals. The pancake vortices tend to couple with increasing magnetic field, which is opposite to the pristine crystal. The double resonance peaks appear as a function of field in a narrow temperature range well above the irreversibility line. This implies an occurrence of the coupling transition in the liquid phase. [S0031-9007(97)04422-0]. C1 AOYAMA GAKUIN UNIV,DEPT PHYS,TOKYO 157,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. ISTEC,SUPERCONDUCT RES LAB,MINATO KU,TOKYO 105,JAPAN. ECOLE POLYTECH,SOLIDES IRRADIES LAB,F-91128 PALAISEAU,FRANCE. UNIV TOKYO,DEPT SUPERCONDUCT,BUNKYO KU,TOKYO 113,JAPAN. NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN. HOKKAIDO UNIV,DEPT PHYS,SAPPORO,HOKKAIDO 060,JAPAN. RP Kosugi, M (reprint author), UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,7-22-1 ROPPONGI,TOKYO 106,JAPAN. RI Gaifullin, Marat/G-4803-2015 NR 22 TC 57 Z9 57 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3763 EP 3766 DI 10.1103/PhysRevLett.79.3763 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600055 ER PT J AU Balatsky, AV Trugman, SA AF Balatsky, AV Trugman, SA TI Lifshitz tail in the density of states of a superconductor with magnetic impurities SO PHYSICAL REVIEW LETTERS LA English DT Article AB We argue that any superconductor with magnetic impurities is gapless due to a Lifshitz tail in the density of states extending to zero energy. At low energy the density of states nu(E --> 0) remains finite. We show that fluctuations in the impurity distribution produce regions of suppressed superconductivity, which are responsible for the low energy density of states. [S0031-9007(97)04452-9]. C1 LD LANDAU THEORET PHYS INST,MOSCOW,RUSSIA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 15 TC 36 Z9 36 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3767 EP 3770 DI 10.1103/PhysRevLett.79.3767 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600056 ER PT J AU Bartolome, F Tonnerre, JM Seve, L Raoux, D Chaboy, J Garcia, LM Krisch, M Kao, CC AF Bartolome, F Tonnerre, JM Seve, L Raoux, D Chaboy, J Garcia, LM Krisch, M Kao, CC TI Identification of quadrupolar excitation channels at the L-3 edge of rare-earth compounds SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY DICHROISM; CIRCULAR-DICHROISM; L(III) EDGE; SCATTERING; METAL; ABSORPTION; DEPENDENCE; (RE)2CO17; HOLMIUM AB Resonant inelastic x-ray scattering spectra are recorded at the L-3 absorption edge of rare-earth ions in R2Fe14B. In all cases, weak resonances are observed at energies below the dipolar white line resonance, originating from 2p --> 4f quadrupolar excitations. Their energy position is in excellent agreement with that of preedge features in the x-ray magnetic circular dichroism (XMCD) spectra of the same samples. Our results therefore evidence the systematic appearance of quadrupolar excitation channels and the importance of their inclusion in the correct interpretation of the XMCD at the L-3 edges of rare-earth systems. [S0031-9007(97)04451-7]. C1 INST CIENCIA MAT ARAGON,ZARAGOZA 50009,SPAIN. EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,UPTON,NY 11973. RP Bartolome, F (reprint author), CNRS,CRISTALLOG LAB,BP 166,F-38042 GRENOBLE,FRANCE. RI Bartolome, Fernando/K-1700-2014 OI Bartolome, Fernando/0000-0002-0047-1772 NR 32 TC 62 Z9 62 U1 1 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3775 EP 3778 DI 10.1103/PhysRevLett.79.3775 PG 4 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600058 ER PT J AU Abulafia, Y Shaulov, A Prozorov, R Wolfus, Y Burlachkov, L Yeshurun, Y Zeldov, E Vinokur, V Geshkenbein, VB AF Abulafia, Y Shaulov, A Prozorov, R Wolfus, Y Burlachkov, L Yeshurun, Y Zeldov, E Vinokur, V Geshkenbein, VB TI Plastic vortex creep in YBa2Cu3O7-x crystals - Reply SO PHYSICAL REVIEW LETTERS LA English DT Article C1 WEIZMANN INST SCI,CONDENSED MATTER PHYS,IL-76100 REHOVOT,ISRAEL. ARGONNE NATL LAB,ARGONNE,IL 60439. ETH ZURICH,ZURICH,SWITZERLAND. RP Abulafia, Y (reprint author), BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. RI Prozorov, Ruslan/A-2487-2008; Zeldov, Eli/K-1546-2012 OI Prozorov, Ruslan/0000-0002-8088-6096; Zeldov, Eli/0000-0002-8200-4974 NR 5 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 10 PY 1997 VL 79 IS 19 BP 3796 EP 3796 DI 10.1103/PhysRevLett.79.3796 PG 1 WC Physics, Multidisciplinary SC Physics GA YF186 UT WOS:A1997YF18600067 ER PT J AU Hoover, WG AF Hoover, WG TI Multifractals from Hamiltonian many-body molecular dynamics SO PHYSICS LETTERS A LA English DT Article ID LYAPUNOV SPECTRA; LORENTZ GAS; EQUILIBRIUM; STATES; SYSTEM AB Nonequilibrium simulations with time-reversible thermostats provide multifractal phase-space structures. But alternative stochastic approaches to temperature control rule out such fine-grained structures. Thus, the validity of the fractals has been questioned. I detail here the construction of the fully-Hamiltonian many-body problems which produce fractal structures isomorphic to those of the nonequilibrium simulations. (C) 1997 Published by Elsevier Science B.V. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP Hoover, WG (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,LIVERMORE,CA 94551, USA. NR 18 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD NOV 10 PY 1997 VL 235 IS 4 BP 357 EP 362 DI 10.1016/S0375-9601(97)00665-8 PG 6 WC Physics, Multidisciplinary SC Physics GA YD646 UT WOS:A1997YD64600008 ER PT J AU Wang, HB Thompson, WH Miller, WH AF Wang, HB Thompson, WH Miller, WH TI Thermal rate constant calculation using flux-flux autocorrelation functions: Application to Cl+H-2->HCl+H reaction SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DISCRETE VARIABLE REPRESENTATION; CUMULATIVE REACTION PROBABILITY; TRANSITION-STATE THEORY; RATE COEFFICIENTS; QUANTUM; SCATTERING; MECHANICS; ROTATION; CL+H-2 AB An efficient method was recently introduced by Thompson and Miller [J. Chem. Phys. 106, 142 (1997)] for calculating thermal rate constants using the flux-flux autocorrelation function with absorbing boundary conditions. The method uses an iterative method to exploit the low rank feature of the Boltzmannized flux operator and subsequently only propagates the eigenvectors that have significant contributions to the rate constant. In the present article, this method is used to calculate the thermal rate constants of the Cl+H-2-->HCl+H reaction in the temperature range of 200-1500 degrees K. Total angular momentum is treated by employing the body-fixed axis frame, both exactly and also via various approximations. Comparisons with previous exact and approximate theoretical results are made. (C) 1997 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Wang, Haobin/E-1208-2011; OI Thompson, Ward/0000-0002-3636-6448 NR 34 TC 81 Z9 82 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 8 PY 1997 VL 107 IS 18 BP 7194 EP 7201 DI 10.1063/1.474959 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YE668 UT WOS:A1997YE66800019 ER PT J AU Longfellow, CA Berrie, CL Suits, AG Lee, YT AF Longfellow, CA Berrie, CL Suits, AG Lee, YT TI Infrared multiphoton dissociation of two perfluorobutenes SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MULTI-PHOTON DISSOCIATION AB Photofragment translational spectroscopy was used to examine the infrared multiphoton dissociation of octafluoro-1-butene and octafluoro-2-butene. The predominant unimolecular reaction in octafluoro-1-butene at moderate laser fluences is cleavage of a carbon-carbon single bond to give the products CF3 and C3F5. The two other reactions that take place are CF2 elimination and the formation of equal weight fragments with the chemical composition C2F4; both reactions take place via a diradical intermediate. Dissociation of octafluoro-1-butene to the resonance stabilized perfluoroallyl radical is suggested to account for the favoring of simple bond rupture. These three reaction pathways were also observed in octafluoro-2-butene dissociation, however, the branching fraction is different than from octafluoro-1-butene. In octafluoro-2-butene all three channels occur with roughly equal probability. The reactions involving CF2 loss and C2F4 formation in octafluoro-2-butene are thought to proceed through the same diradical intermediate as in octafluoro-1-butene, necessitating a 1,2-fluorine migration. (C) 1997 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Lee, Yuan-Tseh/F-7914-2012 NR 19 TC 1 Z9 1 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 8 PY 1997 VL 107 IS 18 BP 7202 EP 7208 DI 10.1063/1.474960 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YE668 UT WOS:A1997YE66800020 ER PT J AU Zhao, HQ Cheung, YS Liao, CL Liao, CX Ng, CY Li, WK AF Zhao, HQ Cheung, YS Liao, CL Liao, CX Ng, CY Li, WK TI A laser photofragmentation time-of-flight mass spectrometric study of acetophenone at 193 and 248 nm SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ENERGY-DISTRIBUTIONS; GAUSSIAN-2 THEORY; ACETYL-CHLORIDE; PHOTODISSOCIATION; ACETONE; CH3CO; THERMOCHEMISTRY; DISSOCIATION; DYNAMICS; KINETICS AB The photodissociation of acetophenone (C6H5COCH3) at 193 and 248 nm has been studied using the time-of-flight mass spectrometric technique. For h nu=193 nm, two major primary channels, C6H5COCH3+liv-->C6H5CO+CH3 [channel (1)] and C6H5+CH3CO [channel (2)], are observed with comparable cross sections. Data analysis shows that approximate to 30%-50% of primary C6H5CO and CH3CO radicals further decomposes, yielding secondary products C6H5+CO and CH3+CO, respectively. The translational energy release measurements indicate that for both channels (I) and (2) at 193 nm, approximate to 25%-30% of the available energy is channeled into kinetic energies of the primary photofragments. Measurements at h nu=248 nm reveal that the branching ratio of channel (2) to channel (1) is approximate to 0.01. For channel (1) at h nu=248 nm, approximate to 42% of the available energy is directed as the kinetic energy of the photofragments. The observed maximum kinetic energy release for channel (1) at 248 nm yields a value of 85.0 +/- 2.2 kcal/mol for the C6H5CO-CH3 bond dissociation energy at 0 K (D-0). The photofragment angular distributions are found to be isotropic for both channels (1) and (2) at h nu=193 nm and for channel (1) at h nu=248 nm. A minor photodissociation channel C6H5COCH3+h nu-->C6H5CH3+CO is identified at both h nu=193 and 248 nm. The energetics for the dissociation reactions of acetophenone have also been investigated using ab initio Gaussian-2-type procedures, The heats of formation at 0 K (Delta(f)H degrees(0)) for C6H5CO and C6H5 calculated using the isodesmic reaction scheme are 33.9 +/- 1.3 and 87.6 +/- 1.0 kcal/mol, respectively. These results suggest that the literature Delta(f)H degrees(0) values for C6H5CO and C6H5 are likely to be low by 3-4 kcal/mol. These theoretical Delta(f)H degrees values for C6H5CO and C6H5 yield a theoretical D-0(C6H5CO-CH3) value of 85.1 +/- 1.4 kcal/mol, which is in excellent accord with the experimental results obtained in the present study. (C) 1997 American Institute of Physics. C1 IOWA STATE UNIV,US DOE,AMES,IA 50011. IOWA STATE UNIV,DEPT CHEM,AMES,IA 50011. CHINESE UNIV HONG KONG,DEPT CHEM,SHATIN,HONG KONG. RP Zhao, HQ (reprint author), IOWA STATE UNIV,AMES LAB,AMES,IA 50011, USA. NR 40 TC 25 Z9 25 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 NOV 8 PY 1997 VL 107 IS 18 BP 7230 EP 7241 DI 10.1063/1.474964 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YE668 UT WOS:A1997YE66800024 ER PT J AU Salsbury, FR Harris, RA AF Salsbury, FR Harris, RA TI The current in magnetic field density functional theory and its application to the chemical shielding and magnetic susceptibility SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID THOMAS-FERMI THEORY; FOCK WAVE-FUNCTIONS; HARTREE-FOCK; ELECTRON-GAS; GRADIENT CORRECTION; TENSOR; ENERGY AB A gradient expansion of the electronic current in the electron density is used to obtain expressions for the magnetic susceptibity and chemical shielding. The first term in the expansion is the Thomas Fermi expression. All succeeding terms diverge for both properties. A renormalized functional is used which removes the divergences and gives asymptotic diamagnetism. A single parameter which depends linearly on the number of electrons gives all heavy rare gas susceptibities to within 1% of exact calculation using the same electron density, Similar results are found for the chemical shielding. Susceptibility and shielding calculations for the helium dimer and the hydrogen molecule in singlet and triplet states are presented. The results are compared with other calculations over a full range of internuclear distances. (C) 1997 American Institute of Physics. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP Salsbury, FR (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Salsbury, Freddie/A-5923-2008 NR 43 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 8 PY 1997 VL 107 IS 18 BP 7350 EP 7359 DI 10.1063/1.475165 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA YE668 UT WOS:A1997YE66800037 ER EF