FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MEI, J DAVENPORT, JW AF MEI, J DAVENPORT, JW TI FREE-ENERGY CALCULATIONS AND THE MELTING-POINT OF AL SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; MOLECULAR-DYNAMICS; INTERATOMIC INTERACTIONS; METALS; SURFACES AB The temperature dependence of the Gibbs free energies of crystalline and liquid aluminum have been calculated using the embedded-atom method with molecular dynamics. The resulting thermodynamic melting point T(m) is 800 K, about 130 K below the experimental value. From the simulation, the free energy of the crystalline phase was obtained by thermodynamic integration methods, while the liquid free energy was calculated by choosing the ideal gas as the reference system. Crystal-liquid interface simulations at zero pressure and several temperatures above and below T(m) have been carried out. Melting and freezing processes were observed. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP MEI, J (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. NR 22 TC 124 Z9 136 U1 4 U2 24 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 JUL 1 PY 1992 VL 46 IS 1 BP 21 EP 25 DI 10.1103/PhysRevB.46.21 PG 5 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600003 ER PT J AU SHANNON, RF NAGLER, SE HARKLESS, CR NICKLOW, RM AF SHANNON, RF NAGLER, SE HARKLESS, CR NICKLOW, RM TI TIME-RESOLVED X-RAY-SCATTERING STUDY OF ORDERING KINETICS IN BULK SINGLE-CRYSTAL CU3AU SO PHYSICAL REVIEW B LA English DT Review ID 1ST-ORDER PHASE-TRANSITIONS; 3-DIMENSIONAL MODEL SYSTEM; ANGLE NEUTRON-SCATTERING; DOMAIN-GROWTH KINETICS; QUENCHED BINARY ALLOY; 2 DIMENSIONS; ISING-MODEL; SPINODAL DECOMPOSITION; DISORDER TRANSITION; COMPUTER-SIMULATION AB Time-resolved x-ray scattering has been used to study ordering kinetics in single-crystal bulk Cu3Au. After annealing at high temperatures, the sample is rapidly quenched to fixed temperatures below the order-disorder transition temperature. The development of order is monitored in real time with use of scattering techniques. The data clearly showed three regimes: nucleation, ordering, and coarsening. The anisotropic superlattice peaks that reflect the domains structure are investigated in connection with the ordering kinetics. The line shape of the scattering function exhibits a crossover from a Gaussian to a Lorentzian squared as the system goes from the ordering regime to the coarsening regime. The line shape of S(Q) is analyzed by fitting the data with a variety of functions. The resolution is accounted for during the fitting. The coarsening in Cu3Au is consistent with curvature-driven growth. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SHANNON, RF (reprint author), UNIV FLORIDA,GAINESVILLE,FL 32611, USA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010 OI Nagler, Stephen/0000-0002-7234-2339 NR 111 TC 50 Z9 50 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 40 EP 54 DI 10.1103/PhysRevB.46.40 PG 15 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600005 ER PT J AU USMAR, SG WRIGHT, RN AF USMAR, SG WRIGHT, RN TI INFLUENCE OF PB IMPURITIES ON HE-BUBBLE FORMATION AND GROWTH IN AL STUDIED BY POSITRON-ANNIHILATION AND TRANSMISSION ELECTRON-MICROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; HELIUM BUBBLES; ALUMINUM; METALS; STATES AB Positron-lifetime and transmission-electron-microscopy measurements are reported for He (4.5 at. ppm), in pure Al, and Pb-contaminated (approximately 1 at. ppm) A1:0.5 wt. % Ni alloy. The observed He-bubble growth in pure Al was found to follow at t1/5 dependence, i.e., was in good agreement with previously published data. The Pb-contaminated alloy exhibited accelerated He agglomerate and bubble growth. Bubbles observed by transmission electron microscopy in the Pb-contaminated alloy were found to have precipitates attached to them. No precipitates were observed that were not associated with bubbles and no bubbles observed that did not have a precipitate attached. Agglomerate and bubble radii were calculated using the positron-lifetime data. Again the results for pure Al were found to be in good agreement with previously published data. In the Pb-contaminated alloy agglomeration and coalescence occurred at temperatures as low as approximately 80-degrees-C, while accrual of free volume started at approximately 180-degrees-C. An increase in bubble growth rate, which occurred between approximately 350-degrees and approximately 400-degrees-C, was tentatively associated with the melting of Pb precipitates. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. NR 27 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 69 EP 75 DI 10.1103/PhysRevB.46.69 PG 7 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600007 ER PT J AU HE, LX LOGRASSO, T GOLDMAN, AI AF HE, LX LOGRASSO, T GOLDMAN, AI TI TWINNED ONE-DIMENSIONAL QUASI-CRYSTALS IN BRIDGMAN-GROWN AL-SI-CU-CO ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID QUASI-CRYSTALS; SOLIDIFICATION MORPHOLOGY; DECAGONAL QUASICRYSTALS; SYSTEM; STATE; AXIS; NI AB Single grains of Al60Si2Cu18Co20 with a decaprismatic morphology were grown by the Bridgman method and studied by transmission electron microscopy and x-ray diffraction. Although the diffraction patterns of these grains superficially resemble that of a decagonal quasicrystal, a closer inspection reveals that they are composed of tenfold twins of a one-dimensional quasicrystal along with small domains of three crystalline approximant phases. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP HE, LX (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 9 Z9 9 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 JUL 1 PY 1992 VL 46 IS 1 BP 115 EP 119 DI 10.1103/PhysRevB.46.115 PG 5 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600013 ER PT J AU MCDOWELL, HK CLOGSTON, AM AF MCDOWELL, HK CLOGSTON, AM TI NONLINEARLY COUPLED VIBRATIONAL-MODES AND SELF-TRAPPED STATES - SINGLE-VIBRON-OSCILLATOR CASE WITH ALPHA-HELIX PARAMETERS SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL MOLECULAR-CRYSTALS; LANGEVIN EQUATION THEORY; TEMPERATURE-DEPENDENCE; POLARON FORMATION; SOLITONS; ACETANILIDE; DYNAMICS; SYSTEMS; SPECTRA AB Quantum molecular-time-scale generalized-Langevin-equation (MTGLE) theory is applied to calculate spectral linewidths and redshifts of a single vibron oscillator nonlinearly coupled by the Davydov Hamiltonian in the alpha-helix parameter regime to a chain of linearly coupled molecules. Exact values can also be calculated for this problem. The MTGLE theory gives very accurate results for linewidths and less accurate but acceptable results for redshifts over a wide range of temperatures from 10 to 300 K. These results successfully extend previous calculations carried out in the L-alanine parameter regime to the alpha-helix parameter regime with a 30-fold increase in frequency of the vibron oscillator and a 1000-fold increase in the square of the nonlinear coupling constant. In constrast to the L-alanine case, the vibron-oscillator frequency is more than 16 times greater than the largest frequency in the phonon manifold. RP MCDOWELL, HK (reprint author), LOS ALAMOS NATL LAB,CLS-2 MS G738,LOS ALAMOS,NM 87545, USA. NR 22 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 126 EP 138 DI 10.1103/PhysRevB.46.126 PG 13 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600015 ER PT J AU BAKER, DB ADOLPHI, N CONRADI, MS FEDDERS, PA NORBERG, RE BARNES, RG TORGESON, DR AF BAKER, DB ADOLPHI, N CONRADI, MS FEDDERS, PA NORBERG, RE BARNES, RG TORGESON, DR TI EVIDENCE FOR THE HIGH-TEMPERATURE SPIN-RELAXATION ANOMALY IN METAL-HYDRIDES SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; DYNAMICAL EVIDENCE; TRANSITION-METALS; DIFFUSION; SYSTEMS; PROTON AB Proton spin-lattice relaxation data R1 (1/T1) are reported for the solid solution Nb0.5V0.5H0.36. In the region of the previously reported anomaly (T>700 K), a strong frequency dependence is observed by extending the measurements to a high frequency, 341 MHz. The correlation time tau(c) is determined and is found to decrease with increasing temperature. The mean-square magnetic-field fluctuation M2 responsible for the relaxation is also determined. Surprisingly, M2 increases rapidly with increasing temperature, suggesting an excited state with a large spin interaction, such as molecular hydrogen. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP BAKER, DB (reprint author), WASHINGTON UNIV,DEPT PHYS 1105,ST LOUIS,MO 63130, USA. NR 26 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 184 EP 187 DI 10.1103/PhysRevB.46.184 PG 4 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600021 ER PT J AU BROOKES, NB CLARKE, A JOHNSON, PD AF BROOKES, NB CLARKE, A JOHNSON, PD TI ELECTRONIC AND MAGNETIC-STRUCTURE OF BCC NICKEL SO PHYSICAL REVIEW B LA English DT Article ID FERROMAGNETIC-RESONANCE; EPITAXIAL-GROWTH; FCC FE; PHOTOEMISSION; NI; INTERFACES; OVERLAYERS; METAL; CO AB The electronic and magnetic structure of metastable bcc nickel grown on Fe(001) has been investigated using spin-polarized angle-resolved photoemission. At the iron lattice constant bcc nickel is found to be ferromagnetic, with a moment of (0.4+/-0.45)mu(B) in reasonable agreement with theoretical predictions, and with a Curie temperature above 300 K. A "6-eV" spin-polarized satellite is also observed, analogous to that seen for fcc nickel previously. The observation of spin polarization in this feature confirms the presence of long-range ferromagnetic order at the local nickel sites. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 27 TC 27 Z9 27 U1 3 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 237 EP 241 DI 10.1103/PhysRevB.46.237 PG 5 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600029 ER PT J AU BULAEVSKII, LN CLEM, JR GLAZMAN, LI AF BULAEVSKII, LN CLEM, JR GLAZMAN, LI TI FRAUNHOFER OSCILLATIONS IN A MULTILAYER SYSTEM WITH JOSEPHSON COUPLING OF LAYERS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES AB The equations for gauge-invariant phases are obtained for superconductors with Josephson coupling of the layers. Using these equations, we find the condition under which Fraunhofer oscillatory dependence of the critical current on parallel magnetic field H can be observed in such compounds: The width of the sample along the ab plane in the direction perpendicular to H should be smaller than the Josephson length lambda(J) = gamma-s, where gamma is the penetration depth anisotropy ratio and s is the interlayer spacing. We show that in the presence of weak disorder such oscillations are more pronounced in a multilayer system than in a single Josephson junction with the same level of disorder. We present the expression for the c-axis critical current density that is inherent to the intrinsic interlayer Josephson effect. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV MINNESOTA,INST THEORET PHYS,MINNEAPOLIS,MN 55455. RP BULAEVSKII, LN (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 66 Z9 66 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 350 EP 355 DI 10.1103/PhysRevB.46.350 PG 6 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600044 ER PT J AU BULAEVSKII, LN LEDVIJ, M KOGAN, VG AF BULAEVSKII, LN LEDVIJ, M KOGAN, VG TI VORTICES IN LAYERED SUPERCONDUCTORS WITH JOSEPHSON COUPLING SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; UPPER CRITICAL-FIELD; UNIAXIAL SUPERCONDUCTORS; II SUPERCONDUCTORS; CRYSTALS; MODEL AB Strongly anisotropic layered superconductors are considered within the Lawrence-Doniach model. The differential finite-difference sine-Gordon equation is derived for the order-parameter phase differences; boundary conditions are formulated for a vortex lattice. The structure of a tilted vortex is considered. The line energy of a single tilted vortex and the free energy of a tilted vortex lattice in moderate magnetic fields are calculated. Deviations from the three-dimensional London theory are substantial for field orientations close to the layers. As the applied field approaches the ab plane, the orientational lock-in transition (tilted-parallel lattice) occurs provided lambda(J) less than or similar to lambda(ab); here lambda(J) = lambda(s) is the Josephson length, gamma is the anisotropy parameter, and s is the interlayer spacing. If lambda(J) greater than or similar to lambda(ab), the tilted lattice transforms first into a new type of vortex arrangement that consists of sets of coexisting parallel and perpendicular vortices (combined lattice). Then, as the field further approaches the ab plane, the combined lattice goes over to the parallel one. The angular dependence of the torque is evaluated for tilted, combined, and parallel lattices, which allows one to experimentally distinguish these phases. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP BULAEVSKII, LN (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 41 TC 265 Z9 265 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 366 EP 380 DI 10.1103/PhysRevB.46.366 PG 15 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600046 ER PT J AU GOHNG, JH FINNEMORE, DK AF GOHNG, JH FINNEMORE, DK TI CRITICAL FIELDS AND VORTEX STRUCTURE OF YBA2CU3O7-DELTA DERIVED FROM REVERSIBLE MAGNETIZATION SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTORS; DIAMAGNETISM; TRANSITION; ANISOTROPY; CRYSTALS AB The magnetic-field and temperature dependence of the Ginzburg-Landau order parameter [f] is derived from magnetization studies for grain-aligned YBa2Cu3O7-delta in the region of thermodynamic reversibility, based on the Hao-Clem model. The value of [f] at 5 T and 89 K is still 52.3% of the zero-field value. Fitting the magnetization data to the Hao-Clem theory reveals that kappa(c) is a slowly decreasing function of temperature near T(c). H(c)(T) and H(c2)(T) were determined with high precision along with the kappa(c)(T) values. The detailed shape of the order parameter is derived from kappa(c)(T) and H(c)(T) data. Characteristic variables derived from the data are H(c)(0) = 1.18 x 10(4) Oe, lambda(ab)(0) = 1.31 X 10(3) angstrom, and xi(ab)(0) = 18 angstrom. The BCS fitting of H(c) reveals that the value of -dH(c2)/dT decreases from 2.25 T/K at T=82 K to 1.9 T/K at T(c) of 92.4 K. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP GOHNG, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 23 TC 38 Z9 38 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 398 EP 404 DI 10.1103/PhysRevB.46.398 PG 7 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600049 ER PT J AU LAM, QH JEFFRIES, CD BERDAHL, P RUSSO, RE READE, RP AF LAM, QH JEFFRIES, CD BERDAHL, P RUSSO, RE READE, RP TI COMPLEX AC PERMEABILITY AND HARMONIC-GENERATION OF A THIN-FILM OF YBA2CU3O7-DELTA - MEASUREMENTS AND MODELS SO PHYSICAL REVIEW B LA English DT Article ID BA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; PULSED LASER DEPOSITION; HIGH-TC SUPERCONDUCTORS; CRITICAL-STATE MODEL; CRITICAL CURRENTS; GRAIN-BOUNDARIES; BICRYSTALS; MICROWAVE; CRYSTALS AB ac permeability and harmonic-generation measurements have been carried out on a pulsed-laser-deposited YBa2Cu3O7-delta thin-film sample. The dependence of the inductive and dissipative components of the permeability on the ac magnetic-field amplitude indicates the absence of intergranular weak links in the sample, in contrast to results from bulk ceramic samples. Both the ac permeability and the harmonic spectra of the sample are well explained in terms of the critical-state model of Bean, which assumes that the critical current is independent of the magnetic field. C1 LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LAM, QH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 23 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 437 EP 442 DI 10.1103/PhysRevB.46.437 PG 6 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600053 ER PT J AU KROL, A SOO, YL MING, ZH HUANG, S KAO, YH SMITH, GC LEE, K JAMES, ACWP MURPHY, DW AF KROL, A SOO, YL MING, ZH HUANG, S KAO, YH SMITH, GC LEE, K JAMES, ACWP MURPHY, DW TI LOCAL-STRUCTURE AROUND F IN THE FLUORINE-DOPED ND2CUO4 SUPERCONDUCTOR SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-ABSORPTION; FINE-STRUCTURE SPECTROSCOPY; FLUORESCENCE; FILMS AB Soft-x-ray-absorption fine-structure (XAFS) measurements were performed at the F K edge on Nd2CuO4-xFx compounds with x=0.15 and 0.30. It is found that a majority of F atoms substitute for the O(2) sites in fluorite-type NdO layers between CuO2 sheets. For the compositions x=0.15 and 0.30, a fraction of 0.33+/-0.15 and 0.39+/-0.14 of F dopants, respectively, substitute for the O(1) site in the CuO2 planes. Fluorine anions placed at the O(2) sites in the NdO layers form a reservoir of extra electrons for the superconducting CuO2 sheets in Nd2CuO4-xFx superconductors, analogous to the substitution of Ce or Th cations for Nd. This observation thus provides evidence for a symmetry of anionic (F) and cationic (Ce and Th) substitution in the NdO layers in connection with superconductivity. C1 SUNY BUFFALO,NEW YORK STATE INST SUPERCONDUCT,BUFFALO,NY 14260. BROOKHAVEN NATL LAB,UPTON,NY 11973. SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP KROL, A (reprint author), SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260, USA. NR 17 TC 15 Z9 15 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 443 EP 447 DI 10.1103/PhysRevB.46.443 PG 5 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600054 ER PT J AU MOROSIN, B VENTURINI, EL AF MOROSIN, B VENTURINI, EL TI POSSIBLE PRESSURE-INDUCED VALENCE CHANGES IN TL2CABA2CU2O8 SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID TC; TEMPERATURE; DIFFRACTION; NEUTRON AB The reported nonlinear pressure dependence of the superconducting critical temperature T(c) in Tl2CaBa2Cu2O8 can be explained by valence changes deduced from the annealing behavior under various environments for single crystals of several Tl-Ca-Ba-Cu-O structure types. The pressure data are consistent with partial conversion of Tl+ to Tl3+ With increasing pressure (decreasing c-axis length), resulting in electron transfer from the Tl-O layers to the Cu-O2 sheets. RP MOROSIN, B (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 510 EP 511 DI 10.1103/PhysRevB.46.510 PG 2 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600069 ER PT J AU WADDILL, GD TOBIN, JG PAPPAS, DP AF WADDILL, GD TOBIN, JG PAPPAS, DP TI MAGNETIC DICHROISM IN CORE-LEVEL PHOTOEMISSION FROM FCC FE/CU(001) FILMS SO PHYSICAL REVIEW B LA English DT Note ID X-RAY DICHROISM; ABSORPTION-SPECTRA; METAL AB Circularly polarized x rays from a synchrotron light source were used in 2p core-level photoemission from thin (2-4 monolayer) fcc Fe films on a Cu(001) substrate. The exchange splitting of this level is resolved by varying the relative orientation of the photon helicity and sample magnetization from parallel to antiparallel. The intensity asymmetry and line-shape variations for parallel and antiparallel orientations are consistent with optical selection rules. Interestingly, the measured exchange splitting for the 3s and 2p levels in these films is reduced from that measured in bulk iron, reflecting differences in local bonding and d-band configurations for bulk and thin-film structures. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP WADDILL, GD (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 21 TC 41 Z9 41 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 552 EP 555 DI 10.1103/PhysRevB.46.552 PG 4 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600080 ER PT J AU COFFEY, MW AF COFFEY, MW TI COUPLED NONLINEAR ELECTRODYNAMICS OF TYPE-II SUPERCONDUCTORS IN THE MIXED STATE SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; EQUATIONS AB A theory of the nonlinear electrodynamics of isotropic high-kappa type-II superconductors containing an array of vortices is presented. The theory generalizes a self-consistent approach to vortex dynamics wherein the effects of nonlocality, vortex inertia, pinning, flux now, and flux creep are treated in a unified fashion. We derive and solve a single vector partial differential equation describing the nonlinear response of a type-II superconductor at frequencies well below the gap frequency. The generation of nth-order harmonics due to bilinear field nonlinearity is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP COFFEY, MW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 25 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 1 BP 567 EP 570 DI 10.1103/PhysRevB.46.567 PG 4 WC Physics, Condensed Matter SC Physics GA JC556 UT WOS:A1992JC55600084 ER PT J AU COLLINS, GW FEARON, EM MAPOLES, ER TSUGAWA, RT SOUERS, PC FEDDERS, PA AF COLLINS, GW FEARON, EM MAPOLES, ER TSUGAWA, RT SOUERS, PC FEDDERS, PA TI DEUTERON NMR IN SOLID D-T SO PHYSICAL REVIEW B LA English DT Article ID SPIN-LATTICE RELAXATION; NUCLEAR LONGITUDINAL RELAXATION; H2 AB The longitudinal relaxation times T1 of the deuteron in solid deuterium-tritium (D-T) were measured from 2.5 to 5.0 K. They are shown to obey the Moriya-Motizuki equation, which means that relaxation takes place through the entirety of the J = 1 D2 line. The total J = 1 D2 plus J = 1 T2 concentrations varied from 26% to 0.75%. The D-T relaxation times were shown to be independent of the NMR frequency. The inherent relaxation times T11 of the D-T were in agreement with those of the deuteron in solid D2. It was shown that the deuteron T11 values could be derived from those of the proton by adjusting the d term of the Hamiltonian. In contrast, the deuteron data for HD in the literature does not obey the Moriya-Motizuki equation, and the derived T11 values are much larger than those of D2 and D-T. It was postulated that electric-field gradients from molecular size mismatches in the crystal cause restricted spin diffusion and a diffusion coefficient on the order of 10(-17) m2/S was calculated. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. RP COLLINS, GW (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 28 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 695 EP 701 DI 10.1103/PhysRevB.46.695 PG 7 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200012 ER PT J AU TURCHI, PEA FINEL, A AF TURCHI, PEA FINEL, A TI ORDERING PHENOMENA IN A15-BASED ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL ALLOYS; SHORT-RANGE ORDER; FCC ISING-MODEL; ELECTRONIC-STRUCTURE; PHASE-DIAGRAM; MULTIATOM INTERACTIONS; MONTE-CARLO; STABILITY; SYSTEMS; A15 AB From a ground-state analysis of the Ising model applied to the A15 crystalline structure with first-, second-, and weak third- and seventh-neighbor pair interactions, additional ordered states are predicted at the compositions A5B3 and A7B. Low-temperature expansions are performed and stability properties as a function of temperature and concentration are investigated by means of variational methods, within the Bragg-Williams and cluster-variation-method approximations. The results are compared with those from Monte Carlo simulations. Typical prototype A 15-based order-disorder phase diagrams and short-range-order diffuse-intensity calculations are presented and discussed in relation to experiment. C1 OFF NATL ETUD & RECH AEROSP,DIV OM,F-92322 CHATILLON,FRANCE. RP TURCHI, PEA (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER L268,POB 808,LIVERMORE,CA 94550, USA. NR 69 TC 14 Z9 14 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 JUL 1 PY 1992 VL 46 IS 2 BP 702 EP 722 DI 10.1103/PhysRevB.46.702 PG 21 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200013 ER PT J AU GARG, A SHIN, M STRANDBURG, KJ AF GARG, A SHIN, M STRANDBURG, KJ TI ROUGHENING OF 2-DIMENSIONAL QUASI-CRYSTALS - A STUDY ON THE PENROSE TILING SO PHYSICAL REVIEW B LA English DT Article ID SOLIDIFICATION MORPHOLOGY; RENORMALIZATION-GROUP; SCHRODINGER-EQUATION; INTERFACES; CRYSTALS; SYSTEMS; SHAPES; IDEAL AB We explore the roughening transition of a two-dimensional quasicrystal using a transfer-matrix approach. We study a solid-on-solid model on a Penrose tiling, thus retaining full two-dimensional quasiperiodicity. We find that the interface is smooth at low temperatures. It is necessary to compute the transfer matrix over extremely long distances (approximately 10(20) tile edges) to determine whether the interface is rough. A blocking scheme suggests a roughening temperature T(R) = 0.28+/-0.01 (all temperatures given in units of J/k(B)). If a finite nonzero T(R) does exist, our results show that the roughness exponent must be discontinuous at T(R). We also study the model using an approximate mapping to a one-dimensional Schrodinger equation. In this approximation, for T less than or similar to 0.45, the interface appears rough with oscillatory corrections to scaling for a large x range, and crosses over to a smooth one as x --> infinity. The crossover region becomes very large for T greater than or similar to 0.45, and we cannot say if there exists a finite T(R). We compare the two approaches. C1 NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GARG, A (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 26 TC 0 Z9 0 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 769 EP 786 DI 10.1103/PhysRevB.46.769 PG 18 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200018 ER PT J AU BORSA, F TORGESON, DR MARTIN, SW PATEL, HK AF BORSA, F TORGESON, DR MARTIN, SW PATEL, HK TI RELAXATION AND FLUCTUATIONS IN GLASSY FAST-ION CONDUCTORS - WIDE-FREQUENCY-RANGE NMR AND CONDUCTIVITY MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; DIFFUSION AB Li-7 nuclear spin-lattice relaxation rates (R1) versus the temperature at several resonance frequencies (4 to 40 MHz) are reported together with the conductivity measurements, sigma(omega), in the range 1 Hz to 3.76 MHz on 0.56Li2S+0.44Si2S, a glassy fast-ionic conductor. Both R1 and sigma(omega) are fitted consistently over the whole temperature and frequency range by using a stretched-exponential, i.e., exp(-t/tau(c)*)beta for the corresponding correlation functions (CF). Formulas that relate R1(omega) and sigma(omega) and that give the asymptotic behavior as functions of T and omega of both quantities are tested experimentally. We find significant differences between beta(sigma) related to sigma(omega) and beta(R) related to R1, which implies a difference in the corresponding correlation functions of the ionic diffusional motion. An apparent order-of-magnitude difference in tau-0* attempt times was derived from these conductivity and NMR measurements. The implications of these findings are discussed in terms of the microscopic mechanisms which lead to fluctuations and relaxation in fast-ionic conductors. C1 UNIV PAVIA,DIPARTIMENTO FIS,I-27100 PAVIA,ITALY. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP BORSA, F (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011, USA. NR 35 TC 122 Z9 122 U1 3 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 795 EP 800 DI 10.1103/PhysRevB.46.795 PG 6 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200020 ER PT J AU LOVE, SP WORL, LA DONOHOE, RJ HUCKETT, SC SWANSON, BI AF LOVE, SP WORL, LA DONOHOE, RJ HUCKETT, SC SWANSON, BI TI ORIGIN OF THE FINE-STRUCTURE IN THE VIBRATIONAL-SPECTRUM OF [PT(C2H8N2)2][PT(C2H8N2)2CL2](CLO4)4 - VIBRATIONAL LOCALIZATION IN A QUASI-ONE-DIMENSIONAL SYSTEM SO PHYSICAL REVIEW B LA English DT Article ID CHAIN-STRETCHING MODE; RAMAN-SPECTRA; COMPLEXES; PLATINUM; EXCITATION; STATES AB The complex fine structure in the Raman spectrum of the quasi-one-dimensional solid [Pt(C2H8N2)2][Pt(C2H8N2)2Cl2](ClO4)4 is shown, through studies of isotopically enriched materials and lattice-dynamics calculations, to originate from vibrational modes strongly localized by the positional disorder of the two naturally occurring Cl isotopes, making this an elegant example of a real material displaying vibrational localization in one dimension. The modes responsible for the observed features reside on short chain segments defined by a few statistically favored sequences of isotopes. RP LOVE, SP (reprint author), LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,INC-4,LOS ALAMOS,NM 87545, USA. OI Love, Steven/0000-0003-0588-9622 NR 18 TC 24 Z9 24 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 813 EP 816 DI 10.1103/PhysRevB.46.813 PG 4 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200022 ER PT J AU FREERICKS, JK FALICOV, LM AF FREERICKS, JK FALICOV, LM TI HEAVY-FERMION SYSTEMS IN MAGNETIC-FIELDS - THE METAMAGNETIC TRANSITION SO PHYSICAL REVIEW B LA English DT Article ID INTERMEDIATE-VALENCE SYSTEM; PERIODIC ANDERSON MODEL; CLUSTER HUBBARD-MODEL; MANY-BODY SOLUTION; GROUND-STATE; T/U EXPANSION; KONDO PROBLEM; FLUCTUATIONS; URU2SI2; LATTICE AB Heavy fermions have a large number of low-lying excitations. Antiferromagnetic superexchange typically favors low-spin arrangements for the ground state. A magnetic field favors high-spin arrangements over low-spin arrangements. The transition from a low-spin ground state to a high-spin ground state, as a function of magnetic field, passes through a range where there is a peak in the many-body density of states. This range qualitatively describes the metamagnetic transition. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FREERICKS, JK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Freericks, James/D-7502-2011; OI Freericks, James/0000-0002-6232-9165 NR 50 TC 9 Z9 9 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 874 EP 879 DI 10.1103/PhysRevB.46.874 PG 6 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200030 ER PT J AU TSUNODA, Y CABLE, JW AF TSUNODA, Y CABLE, JW TI CU-MN - ATOMIC SHORT-RANGE ORDER, SPIN-DENSITY WAVE, AND SPIN-GLASS SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-POLARIZATION-ANALYSIS AB Using a specimen with well-developed atomic short-range order (ASRO), the magnetism of a Cu-Mn alloy was studied by use of a neutron-scattering method. A spin-density wave (SDW) with high Neel temperature (T(N) approximately 400 K) was observed. The SDW propagates on the ab plane of the well-developed ASRO, which is accompanied by a tetragonal lattice distortion. The type of ASRO, the spin structure of the SDW, and the origin of the spin-glass-like behavior in ordinary Cu-Mn alloys are discussed on the basis of the present experimental data. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP TSUNODA, Y (reprint author), OSAKA UNIV,FAC SCI,TOYONAKA,OSAKA 560,JAPAN. NR 13 TC 19 Z9 19 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 930 EP 936 DI 10.1103/PhysRevB.46.930 PG 7 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200037 ER PT J AU MARX, DT RADAELLI, PG JORGENSEN, JD HITTERMAN, RL HINKS, DG PEI, SY DABROWSKI, B AF MARX, DT RADAELLI, PG JORGENSEN, JD HITTERMAN, RL HINKS, DG PEI, SY DABROWSKI, B TI METASTABLE BEHAVIOR OF THE SUPERCONDUCTING PHASE IN THE BABI1-XPBXO3 SYSTEM SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON POWDER DIFFRACTION; BAPB1-XBIXO3 SYSTEM; CRYSTAL-STRUCTURE; TEMPERATURE; BAPB0.75BI0.25O3; BA2BI3+BI5+O6; BA1-XKXBIO3; TRANSITION AB The structural phases of the BaBi1-xPbxO3 system have been studied using neutron powder diffraction. As lead is substituted on the bismuth site, the room-temperature structure is monoclinic for 0.00 less-than-or-equal-to x less-than-or-equal-to 0.20, orthorhombic for 0.25 less-than-or-equal-to x less-than-equal-to 0.65, diphasic (orthorhombic and tetragonal) for 0.70 less-than-or-equal-to x less-than-or-equal-to 0.80, and monoclinic for x = 1.0. Superconductivity is observed for samples in the composition range 0.70 less-than-or-equal-to x less-than-or-equal-to 0.80. The superconducting phase is the tetragonal phase. In situ neutron-powder-diffraction measurements versus temperature show that it is not stable at temperatures below about 425 K. All superconducting samples consist of the metastable tetragonal phase and a semiconducting orthorhombic rhombic phase because the tetragonal-to-orthorhombic transition does not proceed to completion. Samples of Ba1-yKyBi1-xPbxO3 have T(c)'s that are inversely proportional to the total dopant concentration, x + y, in the composition region (0.5 less-than-or-equal-to x + y less-than-equal-to 0.9), where the material is metallic. C1 IIT,CHICAGO,IL 60616. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 27 TC 80 Z9 81 U1 2 U2 14 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 1144 EP 1156 DI 10.1103/PhysRevB.46.1144 PG 13 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200062 ER PT J AU CANKURTARAN, M SAUNDERS, GA GORETTA, KC POEPPEL, RB AF CANKURTARAN, M SAUNDERS, GA GORETTA, KC POEPPEL, RB TI ULTRASONIC DETERMINATION OF THE ELASTIC PROPERTIES AND THEIR PRESSURE AND TEMPERATURE DEPENDENCES IN VERY DENSE YBA2CU3O7-X SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; CERAMIC SUPERCONDUCTORS; HYDROSTATIC-PRESSURE; PHASE-TRANSITION; BULK MODULUS; GDBA2CU3O7-X; BEHAVIOR; LA1.85SR0.15CUO4; POLYCRYSTALLINE; ANOMALIES AB The effects of hydrostatic pressure and temperature have been measured on the velocities of longitudinal and shear ultrasonic waves propagated in a very dense (96% of theoretical density) ceramic specimen of YBa2Cu3O7-x. In YBa2Cu3O7-x ceramics with such a high density, the effects of porosity on the elastic properties should be much reduced. Nevertheless the bulk modulus of this dense material has the same small magnitude (= 55 GPa) as that measured ultrasonically in much less dense YBa2Cu3O7-x ceramics. The temperature dependences of the velocities of longitudinal and shear ultrasonic waves, which have been measured between 10 and 300 K, show a steplike increase at about 200 K on cooling and a similar decrease at about 225 K during warming with hysteresis in the range 190-235 K, features previously observed in less dense ceramics and tentatively attributed to a phase transformation. The pressure dependences of both mode velocities for dense YBa2Cu3O7-x ceramic show a pronounced change of slope at a pressure P(c). For pressures below and above P(c), the pressure dependence of ultrasonic velocity is essentially linear. Above the knee, the enormous pressure dependences of the longitudinal mode velocity and hence of the bulk modulus persist. The temperature dependences of pressure derivatives of elastic stiffnesses and bulk modulus have been measured between 250 and 295 K. The pressure P(c) at which the kink occurs decreases almost linearly with decreasing temperature and extrapolates to atmospheric pressure at about 220 K. This is within the temperature range where the steep changes in the temperature dependences of the ultrasonic velocities occur, suggesting that the anomalous elastic behavior under pressure at P(c) correlates with that observed at about 200-235 K at atmospheric pressure. The mean long-wavelength acoustic-mode Gruneisen parameter gamma(el) has a large value of 11, implying that the vibrational anharmonicity of the long-wavelength acoustic modes is considerable. C1 ARGONNE NATL LAB, DIV MAT & COMPONENTS TECHNOL, ARGONNE, IL 60439 USA. HACETTEPE UNIV, DEPT PHYS, ANKARA 06532, TURKEY. RP UNIV BATH, SCH PHYS, BATH BA2 7AY, AVON, ENGLAND. NR 55 TC 61 Z9 61 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 1157 EP 1165 DI 10.1103/PhysRevB.46.1157 PG 9 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200063 ER PT J AU MCNAUGHTON, KH AMBROSE, DA COFFEY, P JOHNSTON, K RILEY, PJ MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ MERCER, DJ ADAMS, DL SPINKA, H JEPPESEN, RH TRIPARD, GE WOOLVERTON, H AF MCNAUGHTON, KH AMBROSE, DA COFFEY, P JOHNSTON, K RILEY, PJ MCNAUGHTON, MW KOCH, K SUPEK, I TANAKA, N GLASS, G HIEBERT, JC NORTHCLIFFE, LC SIMON, AJ MERCER, DJ ADAMS, DL SPINKA, H JEPPESEN, RH TRIPARD, GE WOOLVERTON, H TI NP ELASTIC SPIN-TRANSFER MEASUREMENTS AT 485 AND 635 MEV SO PHYSICAL REVIEW C LA English DT Article ID C ANALYZING POWER; SCATTERING EXPERIMENTS; NUCLEON AB We have measured the spin-transfer parameters K(LL), K(SL), K(LS) and K(SS) at 635 MeV from 50-degrees to 178-degrees c.m. and at 485 MeV from 74-degrees to 176-degrees c.m. These new data have a significant impact on the phase-shift analyses. There are now sufficient data near these energies to overdetermine the elastic nucleon-nucleon amplitudes. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV COLORADO,BOULDER,CO 80303. RICE UNIV,HOUSTON,TX 77251. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MONTANA,MISSOULA,MT 59812. WASHINGTON STATE UNIV,PULLMAN,WA 99164. UNIV CENT ARKANSAS,CONWAY,AR 72032. RP MCNAUGHTON, KH (reprint author), UNIV TEXAS,AUSTIN,TX 78712, USA. NR 21 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 47 EP 51 DI 10.1103/PhysRevC.46.47 PG 5 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300012 ER PT J AU JONES, MK DEHNHARD, D NANDA, SK STERBENZ, SM MORRIS, CL PLUM, M ZUMBRO, JD HUSSEIN, AH OAKLEY, DS SMITHSON, MJ WILLIAMS, AL MCDONALD, J BRYAN, MA FUENTES, AH LYNKER, M CROCKETT, D MACHUCA, MA MORDECHAI, S MOORE, CF AF JONES, MK DEHNHARD, D NANDA, SK STERBENZ, SM MORRIS, CL PLUM, M ZUMBRO, JD HUSSEIN, AH OAKLEY, DS SMITHSON, MJ WILLIAMS, AL MCDONALD, J BRYAN, MA FUENTES, AH LYNKER, M CROCKETT, D MACHUCA, MA MORDECHAI, S MOORE, CF TI HE-4(PI,PI' P)H-3 REACTION NEAR THE P-33 PI-NUCLEON RESONANCE SO PHYSICAL REVIEW C LA English DT Article ID ELASTIC-SCATTERING; KNOCKOUT REACTIONS; QUASI-FREE; REGION; HE-4 AB Inclusive and exclusive spectra of the He-4(pi, pi' p) reaction were measured with pi+ and pi- at T(pi) = 140 MeV and theta(pi) = 40-degrees, and at 180 MeV and 30-degrees, 40-degrees, 60-degrees, and 80-degrees using the EPICS system at LAMPF in coincidence with eight plastic scintillators. The inclusive spectra yield cross section ratios R(pi) = sigma(pi+)/sigma(pi-) = 1.1 +/- 0.1 at both T(pi) and all theta(pi). Exclusive spectra were obtained between He-4(*) excitation energies E(x) = 21.5 and 45.0 MeV. Angular correlation functions for (pi, pi' p) were extracted at T(pi) = 180 MeV at the four pion angles for selected regions of E(x). The (pi+, pi+' p) angular correlations show a distinct peak near the free proton knockout angle; however, the (pi-, pi-' p) data show either a flat distribution or a minimum near that angle. Calculations, using a distorted wave impulse approximation (DWIA) code which models the (pi, pi' p) reaction as a pion-induced proton knockout, predict peaks in the angular correlation functions in the quasifree knockout direction and reproduce quite well the (pi+, pi+' p) data above E(x) = 30 MeV. However, these calculations do not resemble the (pi-, pi-' p) data at any excitation energy. Above E(x) = 30 MeV, the ratios R(pi-p) = sigma(pi+, pi+' p)/sigma(pi-, pi-' p) were found to be unexpectedly large (up to R(pi-p) = 50) near the free proton knockout angle and very small (R(pi-p) = 0.3) in the opposite direction in contrast to DWIA predictions of 8 and 5, respectively. These discrepancies are evidence that strong interference occurs between the quasifree proton knockout and another process, especially in the (pi-, pi-' p) reaction. Near the He-4 --> p + t breakup threshold, where the 2-, T = 0 state in He-4 (E(x) = 21.8 MeV) is known to exist, the ratio R(pi-p) was found to be between 1 and 2 at all pion angles which is in reasonable agreement with the expected value of 1 for the excitation and decay of a state of good isospin. C1 UNIV MINNESOTA,MINNEAPOLIS,MN 55455. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV PENN,PHILADELPHIA,PA 19104. KING FAHD UNIV PETR & MINERALS,DHAHRAN 31261,SAUDI ARABIA. UNIV TEXAS,AUSTIN,TX 78712. LEWIS & CLARK COLL,PORTLAND,OR 97219. BEN GURION UNIV NEGEV,BEER SHEVA,ISRAEL. NR 41 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 52 EP 63 DI 10.1103/PhysRevC.46.52 PG 12 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300013 ER PT J AU KUHNERT, A STOYER, MA BECKER, JA HENRY, EA BRINKMAN, MJ YATES, SW WANG, TF CIZEWSKI, JA STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM MACCHIAVELLI, AO DRAPER, JE AZAIEZ, F KELLY, WH KORTEN, W AF KUHNERT, A STOYER, MA BECKER, JA HENRY, EA BRINKMAN, MJ YATES, SW WANG, TF CIZEWSKI, JA STEPHENS, FS DELEPLANQUE, MA DIAMOND, RM MACCHIAVELLI, AO DRAPER, JE AZAIEZ, F KELLY, WH KORTEN, W TI OBLATE COLLECTIVITY IN PB-197 SO PHYSICAL REVIEW C LA English DT Article ID PB ISOTOPES; NUCLEI; STATES; EXCITATIONS; COEXISTENCE; BANDS AB Evidence for collective behavior in the high-spin region of lead nuclei is provided by the observation of two collective structures in 197Pb. One of these bands is interpreted as an oblate collective structure built on oblate proton and possibly neutron states. A second more irregular band is suggested to be most likely a triaxial rotational band. Neutron and proton configurations for these bands are suggested from the results of quasiparticle Routhians and total Routhians surface calculations. A partial level scheme up to I almost-equal-to 69/2 and E(x) almost-equal-to 8 MeV is presented. C1 UNIV KENTUCKY,LEXINGTON,KY 40506. COMIS NACL ENERGIA ATOM,RA-1429 BUENOS AIRES,DF,ARGENTINA. UNIV CALIF DAVIS,DAVIS,CA 95616. INST PHYS NUCL,F-91406 ORSAY,FRANCE. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. RP KUHNERT, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI KORTEN, Wolfram/H-3043-2013; OI KORTEN, Wolfram/0000-0002-3940-0816 NR 26 TC 62 Z9 65 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 133 EP 143 DI 10.1103/PhysRevC.46.133 PG 11 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300018 ER PT J AU BHATT, KH NESTOR, CW RAMAN, S AF BHATT, KH NESTOR, CW RAMAN, S TI DO NUCLEONS IN ABNORMAL-PARITY STATES CONTRIBUTE TO DEFORMATION SO PHYSICAL REVIEW C LA English DT Article ID EVEN-EVEN NUCLEI; SHELL-MODEL; QUADRUPOLE-MOMENTS; DEFORMED-NUCLEI; VALUES; SYMMETRIES; ENERGIES AB We consider intrinsic states of highly deformed nuclei in the framework of the universal Woods-Saxon model and show that valence nucleons in abnormal-parity high-j states contribute approximately 20% to the electric quadrupole moments of these nuclei. Similarly, we show that in the single-shell asymptotic Nilsson model this contribution is approximately 25% if reasonable effective charges are employed. We discuss, at some length, procedures used to arrive at reasonable effective charges. Both models reproduce the measured B (E2;0(1)+ --> 2(1)+) values in the rare-earth and actinide regions without the need for normalization constants. No support is found for the assumption made in the pseudo-SU(3) and the fermion dynamic symmetry models that valence nucleons in abnormal-parity high-j states do not contribute to deformation. This counterintuitive assumption leads to an underestimate of the B (E2;0(1)+ --> 2(1)+) values, which is compensated in these models by the use of appropriate normalization constants. Once the magnitudes are fixed, both models do correctly reproduce the B (E2) trends. C1 HOLIFIELD HEAVY ION RES FACIL,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BHATT, KH (reprint author), UNIV MISSISSIPPI,DEPT PHYS & ASTRON,UNIVERSITY,MS 38677, USA. NR 30 TC 33 Z9 34 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 164 EP 180 DI 10.1103/PhysRevC.46.164 PG 17 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300021 ER PT J AU VONEIFF, D HADDAD, S WEIGEL, MK AF VONEIFF, D HADDAD, S WEIGEL, MK TI APPROACH TO THE RELATIVISTIC EXTENDED THOMAS-FERMI EXPANSION FOR GREEN-FUNCTIONS, PHASE-SPACE DENSITIES, AND DENSITIES SO PHYSICAL REVIEW C LA English DT Article ID SEMI-CLASSICAL APPROXIMATIONS; NUCLEAR HAMILTONIANS; POTENTIALS; SYSTEMS AB We present an extension of the semiclassical Thomas-Fermi model to relativistic systems. These are obtained by application of the gradient expansion scheme on the Wigner transformed Dyson equation. Explicitly we give the expansion of the Green's functions, phase-space densities, and densities for a system of nucleons in a vector and scalar potential to second order. C1 UNIV MUNICH, SEKT PHYS, W-8046 GARCHING, GERMANY. RP VONEIFF, D (reprint author), LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. NR 21 TC 16 Z9 16 U1 2 U2 3 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 JUL PY 1992 VL 46 IS 1 BP 230 EP 237 DI 10.1103/PhysRevC.46.230 PG 8 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300028 ER PT J AU BALDWIN, AR MADEY, R ZHANG, WM ANDERSON, BD KEANE, D VARGA, J WATSON, JW WESTFALL, GD FRANKEL, K GALE, C AF BALDWIN, AR MADEY, R ZHANG, WM ANDERSON, BD KEANE, D VARGA, J WATSON, JW WESTFALL, GD FRANKEL, K GALE, C TI INCLUSIVE NEUTRON CROSS-SECTIONS FROM NE-PB COLLISIONS AT 790 MEV/NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; 800 MEV NUCLEON; PION-PRODUCTION; ENERGY; MODEL; FLOW; DYNAMICS; EQUATION; SPECTRA; STATE AB Inclusive neutron spectra were measured at 0-degrees, 15-degrees, 30-degrees, 50-degrees, 70-degrees, 90-degrees, 120-degrees, and 160-degrees from Ne-Pb collisions at 790 MeV/nucleon. A peak that originates from neutron evaporation from the projectile appears in the spectra at 0-degrees. The shapes and magnitudes of the spectra are compared with those calculated from models of nucleus-nucleus collisions. The Boltzmann-Uehling-Uhlenbeck (BUU), intranuclear cascade (INC), and firestreak models agree generally with the measured double-differential cross sections and particularly at 50-degrees and beyond; however, none of the models can reproduce the peaks at small angles (theta less-than-or-equal-to 15-degrees). The quantum molecular dynamics (QMD) model underestimates the spectra of the double-differential cross sections at all angles and energies for this asymmetric system. Also, the predictions of the INC model agrees with the angular distribution of the differential cross sections except that it underestimates the cross section at 0-degrees; the BUU prediction overestimates the differential cross section at 0-degrees and 90-degrees; firestreak overpredicts at 15-degrees and 30-degrees and underpredicts at 70-degrees and 90-degrees; and the QMD model underpredicts the measured angular distribution and the energy spectra at forward angles. C1 MICHIGAN STATE UNIV,E LANSING,MI 48823. LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT,BERKELEY,CA 94720. MCGILL UNIV,MONTREAL H3A 2T8,QUEBEC,CANADA. RP BALDWIN, AR (reprint author), KENT STATE UNIV,KENT,OH 44242, USA. NR 28 TC 15 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 258 EP 264 DI 10.1103/PhysRevC.46.258 PG 7 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300032 ER PT J AU GILFOYLE, GP GORDON, MS MCGRATH, RL AUGER, G ALEXANDER, JM KOVAR, DG VINEYARD, MF BECK, C HENDERSON, DJ DEYOUNG, PA KORTERING, D AF GILFOYLE, GP GORDON, MS MCGRATH, RL AUGER, G ALEXANDER, JM KOVAR, DG VINEYARD, MF BECK, C HENDERSON, DJ DEYOUNG, PA KORTERING, D TI HEAVY RESIDUE PRODUCTION IN 215 MEV O-16+AL-27 REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID INCOMPLETE FUSION; EVAPORATION RESIDUES; ENERGY-DEPENDENCE; CROSS-SECTIONS; MEV NUCLEON; O-16+CA-40 AB Mass, velocity, and angular distributions have been measured for heavy products and for light charged particles from the reaction 215 MeV O-16 + Al-27. Coincidences between evaporation residues and light charged particles have also been measured. Statistical-model calculations, incorporating light-particle decay from either the compound nucleus or the composite nucleus formed in the direct emission of a beam velocity particle, cannot account for the observed cross sections or angular distributions of the heavy residues. More elaborate kinematic simulations, which include direct light-particle emission as observed in the light-particle inclusive data, also do not work. This supports the notion that heavy fragment production (A > 4) would be needed to account for the residue distributions. C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. ARGONNE NATL LAB,ARGONNE,IL 60439. HOPE COLL,DEPT PHYS,HOLLAND,MI 49423. GRAND ACCELERATOR NATL IONS LOURDES,F-14021 CAEN,FRANCE. UNIV LOUIS PASTEUR,CTR RECH NUCL,CNRS,IN2P3,F-60737 STRASBOURG,FRANCE. NR 21 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 265 EP 272 DI 10.1103/PhysRevC.46.265 PG 8 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300033 ER PT J AU RANSOME, RD MORRIS, CL JONES, MK RITCHIE, BG WATSON, DL MCGILL, JA PUJARA, K CLAYTON, DB BROWN, I CAMPBELL, P MOORE, CF AF RANSOME, RD MORRIS, CL JONES, MK RITCHIE, BG WATSON, DL MCGILL, JA PUJARA, K CLAYTON, DB BROWN, I CAMPBELL, P MOORE, CF TI PION ABSORPTION IN LIGHT-NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID TRUE ABSORPTION; CROSS-SECTIONS; SCATTERING; LI-6 AB Cross sections have been measured for proton emission following pi+ absorption on Li-6, Li-7, Be-9 B-10, B-11, C-12, and C-13, for pion kinetic energies of 50, 100, 140, and 180 MeV using a large-solid-angle bismuth germanate detector array. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV YORK,YORK YO1 5DD,N YORKSHIRE,ENGLAND. ARIZONA STATE UNIV,TEMPE,AZ 85287. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. UNIV TEXAS,AUSTIN,TX 78712. RP RANSOME, RD (reprint author), RUTGERS STATE UNIV,PISCATAWAY,NJ 08855, USA. NR 20 TC 20 Z9 20 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 273 EP 278 DI 10.1103/PhysRevC.46.273 PG 6 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300034 ER PT J AU BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE DAVID, G DIETZSCH, O DUEK, E FATYGA, M FOX, D GREENE, SV HALL, JR HEIFETZ, R HEMMICK, TK HERMAN, M HERMANN, N HOGUE, RW INGOLD, G JAYANANDA, K KRAUS, D KUMAR, S LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, T MAJKA, R MAKOWIECKI, D MARK, SK MCCORKLE, SR MITCHELL, JT MUTHUSWAMY, M OBRIEN, E OLSEN, L POLYCHRONAKOS, V PRUNEAU, C RAWOOLSULLIVAN, M ROTONDO, F SANDWEISS, J SIMONGILLO, J SONNADARA, U STACHEL, J SULLIVAN, JP SUNIER, J TAKAGUI, EM TAKAI, H THROWE, T VANHECKE, H WATERS, L WOLF, K WOLFE, D WOODY, CL XU, N ZHANG, Z AF BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE DAVID, G DIETZSCH, O DUEK, E FATYGA, M FOX, D GREENE, SV HALL, JR HEIFETZ, R HEMMICK, TK HERMAN, M HERMANN, N HOGUE, RW INGOLD, G JAYANANDA, K KRAUS, D KUMAR, S LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, T MAJKA, R MAKOWIECKI, D MARK, SK MCCORKLE, SR MITCHELL, JT MUTHUSWAMY, M OBRIEN, E OLSEN, L POLYCHRONAKOS, V PRUNEAU, C RAWOOLSULLIVAN, M ROTONDO, F SANDWEISS, J SIMONGILLO, J SONNADARA, U STACHEL, J SULLIVAN, JP SUNIER, J TAKAGUI, EM TAKAI, H THROWE, T VANHECKE, H WATERS, L WOLF, K WOLFE, D WOODY, CL XU, N ZHANG, Z TI CHARGED-PARTICLE MULTIPLICITY IN SI-28 + AL, CU, AND PB REACTIONS AT ELAB = 14.6 GEV/NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; HEAVY-ION COLLISIONS; HADRON-NUCLEUS; MODEL; GEV/C AB Collisions of Si-28+Al, Cu, and Pb at E(lab)=14.6 GeV/nucleon were studied at the Brookhaven National Laboratory Alternating Gradient Synchrotron. Charged particle multiplicity was measured over the pseudorapidity interval 0.875 less-than-or-equal-to eta less-than-or-equal-to 3.86 with a silicon pad detector. A strong correlation is seen between the multiplicity and the transverse energy measured in the interval -0.5 less-than-or-equal-to eta less-than-or-equal-to 0.8. Correlation with the energy going forward after the collision and comparison with calculations indicate that rescattering is required to explain the data. The data are compared under the assumption of Koba-Nielson-Olesen scaling. The measured multiplicity scales approximately with the total number of participant nucleons and less well with the available center-of-mass kinetic energy. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. MCGILL UNIV,MONTREAL H3A 2T8,QUEBEC,CANADA. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY STONY BROOK,STONY BROOK,NY 11794. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. YALE UNIV,NEW HAVEN,CT 06511. UNIV SAO PAULO,SAO PAULO,BRAZIL. RP BARRETTE, J (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Sonnadara, Upul/E-6359-2010; Takai, Helio/C-3301-2012; OI Takai, Helio/0000-0001-9253-8307; Sonnadara, Upul/0000-0001-7862-2537 NR 27 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1992 VL 46 IS 1 BP 312 EP 321 DI 10.1103/PhysRevC.46.312 PG 10 WC Physics, Nuclear SC Physics GA JE063 UT WOS:A1992JE06300038 ER PT J AU ROCK, S ARNOLD, RG BOSTED, PE CHERTOK, BT MECKING, BA SCHMIDT, I SZALATA, ZM YORK, RC ZDARKO, R AF ROCK, S ARNOLD, RG BOSTED, PE CHERTOK, BT MECKING, BA SCHMIDT, I SZALATA, ZM YORK, RC ZDARKO, R TI MEASUREMENT OF ELASTIC ELECTRON-NEUTRON SCATTERING AND INELASTIC ELECTRON-DEUTERON SCATTERING CROSS-SECTIONS AT HIGH MOMENTUM-TRANSFER SO PHYSICAL REVIEW D LA English DT Review ID NUCLEON FORM-FACTORS; SQUARED 4-MOMENTUM TRANSFERS; THRESHOLD REGION; INCLUSIVE SCATTERING; EXCLUSIVE PROCESSES; LEPTON SCATTERING; MUON SCATTERING; SCALING LAWS; IRON TARGETS; 3 (GEV-C)2 AB We have measured inelastic electron-deuteron, electron-proton, and electron-aluminum cross sections at 10-degrees in the kinematic region between elastic deuteron scattering and the second resonance region at six beam energies between 9.8 and 21 GeV. The elastic electron-neutron cross section was extracted from the quasielastic data at Q2=2.5, 4.0, 6.0, 8.0, and 10.0 (GeV/c)2. The ratio of elastic cross sections sigma(n) /sigma(p) falls with increasing Q2 above 6 (GeV/c)2. The inelastic data are compatible either with y scaling (scattering from a single nucleon) or with xi-scaling (scattering from quarks). C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP ROCK, S (reprint author), AMERICAN UNIV,WASHINGTON,DC 20016, USA. RI Schmidt, Ivan/J-5920-2012 NR 92 TC 50 Z9 50 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 24 EP 44 DI 10.1103/PhysRevD.46.24 PG 21 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200006 ER PT J AU BARNES, T SWANSON, ES AF BARNES, T SWANSON, ES TI DIAGRAMMATIC APPROACH TO MESON-MESON SCATTERING IN THE NONRELATIVISTIC QUARK POTENTIAL MODEL SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE HADRON THEORIES; ELASTIC-SCATTERING; CHROMODYNAMICS; ENERGY; SYSTEM; PROTON; PART AB In this paper we use Born-order quark-exchange diagrams in a nonrelativistic potential model to describe low-energy scattering of qqBAR mesons. A formalism for evaluating quark Born diagrams is developed, and as a first application we consider meson-meson scattering in channels in which qqBAR annihilation is thought to be unimportant. In particular our results axe relevant to I = 2-pi-pi and I = 1 KK elastic scattering. Simple rules for the Born diagrams are given, which allow the evaluation of scattering amplitudes in terms of external meson wave functions by inspection. These techniques are applied to systems having identical quarks, and pi+pi+, K+K+, and p+p+ elastic scattering phase shifts, cross sections, and equivalent potentials are derived as examples. The S-wave I = 2-pi-pi phase shift for a Gaussian qqBAR wave function with conventional quark model parameters alpha(s), m(q), and beta(SHO) is found to be in good agreement with experiment and with Weinberg's PCAC (partial conservation of axial-vector current) result. At higher energies the predicted differential cross sections have the characteristic diffractive features of an exponential t peak at small angles and vacuum quantum number exchange. The phase of the predicted amplitude however differs from the experimental diffractive amplitude, so these quark Born diagrams cannot be directly identified with the "Pomeron" of diffractive scattering phenomenology. C1 OAK RIDGE NATL LAB,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. MIT,CTR THEORET PHYS,CAMBRIDGE,MA 02139. RP BARNES, T (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 47 TC 112 Z9 113 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 131 EP 159 DI 10.1103/PhysRevD.46.131 PG 29 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200015 ER PT J AU BERGER, EL MENG, RB AF BERGER, EL MENG, RB TI HEAVY-QUARK CROSS-SECTIONS AT HADRON COLLIDER ENERGIES SO PHYSICAL REVIEW D LA English DT Article ID COLLISIONS; QCD AB Calculations of inclusive cross sections for the production of bottom quarks in proton-proton and proton-antiproton collisions are presented as a function of energy, transverse momentum, rapidity, and pseudorapidity for values of square-root s ranging from 100 GeV to 40 TeV. The computations are based on next-to-leading-order matrix elements from perturbative quantum chromodynamics and on the most recently published sets of parton densities. Variations of the behavior of the gluon density in the region of very small x provide an estimate of the range of theoretical uncertainty. At Superconducting Super Collider energies, results are presented for both the collider configuration square-root s = 40 TeV and the fixed-target option square-root s = 200 GeV. Included are calculations of charm-quark inclusive cross sections at square-root s = 200 GeV and 1.8 TeV. RP BERGER, EL (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. OI Meng, Ruibin/0000-0002-4846-4619 NR 26 TC 17 Z9 18 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 169 EP 180 DI 10.1103/PhysRevD.46.169 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200017 ER PT J AU ANDERSON, JD AUSTERN, MH CAHN, RN AF ANDERSON, JD AUSTERN, MH CAHN, RN TI MEASUREMENT OF Z'-COUPLINGS AT FUTURE HADRON COLLIDERS THROUGH DECAYS TO TAU-LEPTONS SO PHYSICAL REVIEW D LA English DT Article ID EXTRA GAUGE BOSONS; E6 AB The leptonic couplings of a Z' can be determined in a hadron collider by measuring the polarization of tau-leptons produced by its decay. This polarization can be measured despite the unobserved neutrinos produced in tau-decay. The information obtained is complementary to that given by the forward-backward asymmetry and can be used to determine the character of the Z'. We discuss the background to this process, the expected uncertainty of the measurement, and the implied detector requirements. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP ANDERSON, JD (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 19 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 290 EP 302 DI 10.1103/PhysRevD.46.290 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200030 ER PT J AU BAER, H BISSET, M TATA, X WOODSIDE, J AF BAER, H BISSET, M TATA, X WOODSIDE, J TI SUPERCOLLIDER SIGNALS FROM GLUINO AND SQUARK DECAYS TO HIGGS BOSONS SO PHYSICAL REVIEW D LA English DT Article ID HADRON COLLIDERS; Z0 DECAY; SUPERSYMMETRY; QUARK; SIGNATURES; PHYSICS; SEARCH AB If the mass of the charged Higgs boson of the minimal supersymmetric model (MSSM) is smaller than about 150 GeV, the branching fraction for heavy gluinos and left-handed squarks to cascade decay to the heavier Higgs bosons H(h), H(p), and H+/- of the MSSM may be as large as 50-60 % for values of supersymmetric parameters consistent with experimental data. These decays, which have been assumed to be kinematically inaccessible in earlier analyses, can potentially lead to significant modification of the cross section for missing E(T) (is not an element of T), same-sign dilepton, and multilepton events from squarks and gluinos. We find that the is not an element of T, same-sign dilepton, and trilepton production rates are relatively insensitive to low values of m(H+), so that these remain viable signals for the identification of gluinos and squarks at the Superconducting Super Collider or the CERN Large Hadron Collider. Finally, our exploratory study shows that substantial production of H(h) and H(p) (H+/-) in gluino and squark pair events can lead to is not an element of T events with anomalously large numbers of b quarks (tau-leptons). There also exist small regions of parameter space where the H(l) and H(h) may be identifiable via the presence of gamma-gamma is not an element of T events. C1 UNIV HAWAII,DEPT PHYS & ASTRON,HONOLULU,HI 96822. IOWA STATE UNIV,DEPT PHYS,AMES,IA 50011. AMES LAB,AMES,IA 50011. RP BAER, H (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 63 TC 53 Z9 53 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 303 EP 314 DI 10.1103/PhysRevD.46.303 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200031 ER PT J AU AEPPLI, A SONI, A AF AEPPLI, A SONI, A TI ANALYSIS OF THE TAU-DIPOLE MOMENT VIA E+E- AND GAMMA-GAMMA REACTIONS SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-ION COLLISIONS; BEAMSTRAHLUNG; BEAMS AB We calculate CP-odd correlations sensitive to the electric dipole moment of the tau via the direct e+e--->tau+tau- and the two-photon process gamma-gamma-->tau+tau-. Photon beams both from classical bremsstrahlung either in e+e- or ultrarelativistic heavy-ion collisions and from Compton-backscattered laser light off high-energy e+e- beams are considered. For several experimental observables we compare the sensitivity to the electric dipole moment achievable for the various reactions. RP AEPPLI, A (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 21 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 315 EP 321 DI 10.1103/PhysRevD.46.315 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200032 ER PT J AU BURGESS, CP CLINE, JM LUTY, MA AF BURGESS, CP CLINE, JM LUTY, MA TI NATURAL FRAMEWORK FOR SOLAR AND 17-KEV NEUTRINOS SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-NEUTRINO; BETA-DECAY; MODELS; SEARCH; S-35; SPECTRUM; MASSES AB Motivated by recent experimental claims for the existence of a 17-keV neutrino and by the solar-neutrino problem, we consider a class of models which contain in their low-energy spectrum a single light sterile neutrino and one or more Nambu-Goldstone bosons. In these models, the required pattern of small neutrino masses and Nambu-Goldstone-boson couplings are understood as the low-energy residue of the pattern of breaking of lepton-number symmetries near the electroweak scale, and all mass hierarchies are technically natural. The models are compatible with all cosmological and astrophysical constraints, and can solve the solar-neutrino problem either via the Mikheyev-Smirnov-Wolfenstein effect or vacuum oscillations. The deficit in atmospheric muon neutrinos seen in the Kamiokande and IMB detectors can also be explained in these models. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. RP BURGESS, CP (reprint author), MCGILL UNIV,DEPT PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. NR 49 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 364 EP 373 DI 10.1103/PhysRevD.46.364 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200036 ER PT J AU PESKIN, ME TAKEUCHI, T AF PESKIN, ME TAKEUCHI, T TI ESTIMATION OF OBLIQUE ELECTROWEAK CORRECTIONS SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL PERTURBATION-THEORY; PARITY NONCONSERVATION; HADRONIC CONTRIBUTIONS; RADIATIVE-CORRECTIONS; TECHNICOLOR THEORIES; ISOSPIN BREAKING; STANDARD MODEL; ATOMIC CESIUM; ONE-LOOP; MASS AB We review the general analysis of the contributions of electroweak vacuum-polarization diagrams to precision experiments. We first review the representation of these contributions by three parameters S, T, and U and discuss the assumptions involved in this reduction. We then discuss the contributions to these parameters from various models of new physics. We show that S can be computed by a dispersion relation, and we use this technique to estimate S in technicolor models of the Higgs sector. We discuss the reliability and the gauge invariance of this estimate. Finally, we present the limits on S and T imposed by current experimental results. RP PESKIN, ME (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 81 TC 1285 Z9 1285 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 381 EP 409 DI 10.1103/PhysRevD.46.381 PG 29 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200038 ER PT J AU SCHUMM, BA KOETKE, DS ADOLPHSEN, CE ALEXANDER, JP AVERILL, D BARISH, BC BARKLOW, T BARNETT, BA BLOCKUS, D BOYARSKI, A BRABSON, B BREAKSTONE, A BULOS, F BURCHAT, PR BURKE, DL CENCE, RJ CHAPMAN, J CHMEISSANI, M CORDS, D COUPAL, DP DAUNCEY, P DESTAEBLER, HC DORFAN, JM DRELL, PS DREWER, DC DURRETT, D ELIA, R FELDMAN, GJ FIELD, RC FORD, WT FORDHAM, C FREY, R FUJINO, D GAN, KK GERO, E GIDAL, G GLANZMAN, T GOLDHABER, G CADENAS, JJG GRATTA, G HANSON, G HARR, R HARRAL, B HARRIS, FA HAYES, K HEARTY, C HEUSCH, CA HILDRETH, MD HIMEL, T HINSHAW, DA HONG, SJ HUTCHINSON, D HYLEN, J INNES, WR JACOBSEN, RG JAROS, JA JUNG, CK KADYK, JA KENNEY, C KING, M KOMAMIYA, S KOWALSKI, LA KRAL, JF KUHLEN, M LABARGA, L LANKFORD, AJ LEDIBERDER, F LEVI, ME LITKE, AM LOU, XC LUTH, V MCKENNA, JA MATTHEWS, JAJ MATTISON, T MOFFEIT, KC MUNGER, CT MURRAY, WN NASH, J OGREN, H OSHAUGHNESSY, KF PARKER, SI PECK, C PERL, ML PETRADZA, M PITTHAN, R PORTER, FC RANKIN, P ROUSE, FR RUST, DR SADROZINSKI, HFW SCHWARZ, AS SEIDEN, A SMITH, JG SNYDER, A SODERSTROM, E STOKER, DP STROYNOWSKI, R SWARTZ, M THUN, R TRILLING, GH TURALA, M VANKOOTEN, R WEBER, P WEINSTEIN, AJ WICKLUND, E WAGNER, SR WOODS, M YURKO, M ZACCARDELLI, C AF SCHUMM, BA KOETKE, DS ADOLPHSEN, CE ALEXANDER, JP AVERILL, D BARISH, BC BARKLOW, T BARNETT, BA BLOCKUS, D BOYARSKI, A BRABSON, B BREAKSTONE, A BULOS, F BURCHAT, PR BURKE, DL CENCE, RJ CHAPMAN, J CHMEISSANI, M CORDS, D COUPAL, DP DAUNCEY, P DESTAEBLER, HC DORFAN, JM DRELL, PS DREWER, DC DURRETT, D ELIA, R FELDMAN, GJ FIELD, RC FORD, WT FORDHAM, C FREY, R FUJINO, D GAN, KK GERO, E GIDAL, G GLANZMAN, T GOLDHABER, G CADENAS, JJG GRATTA, G HANSON, G HARR, R HARRAL, B HARRIS, FA HAYES, K HEARTY, C HEUSCH, CA HILDRETH, MD HIMEL, T HINSHAW, DA HONG, SJ HUTCHINSON, D HYLEN, J INNES, WR JACOBSEN, RG JAROS, JA JUNG, CK KADYK, JA KENNEY, C KING, M KOMAMIYA, S KOWALSKI, LA KRAL, JF KUHLEN, M LABARGA, L LANKFORD, AJ LEDIBERDER, F LEVI, ME LITKE, AM LOU, XC LUTH, V MCKENNA, JA MATTHEWS, JAJ MATTISON, T MOFFEIT, KC MUNGER, CT MURRAY, WN NASH, J OGREN, H OSHAUGHNESSY, KF PARKER, SI PECK, C PERL, ML PETRADZA, M PITTHAN, R PORTER, FC RANKIN, P ROUSE, FR RUST, DR SADROZINSKI, HFW SCHWARZ, AS SEIDEN, A SMITH, JG SNYDER, A SODERSTROM, E STOKER, DP STROYNOWSKI, R SWARTZ, M THUN, R TRILLING, GH TURALA, M VANKOOTEN, R WEBER, P WEINSTEIN, AJ WICKLUND, E WAGNER, SR WOODS, M YURKO, M ZACCARDELLI, C TI MEASUREMENT OF THE CHARGED MULTIPLICITY OF EVENTS CONTAINING BOTTOM HADRONS AT EC.M.=91 GEV SO PHYSICAL REVIEW D LA English DT Note ID TOTAL CROSS-SECTION; HEAVY-QUARK JETS; MARK-II DETECTOR; LUND MONTE-CARLO; E+E ANNIHILATION; PARTICLE MULTIPLICITIES; DRIFT CHAMBER; FRAGMENTATION; DISTRIBUTIONS; ENERGIES AB Using an impact-parameter tag to select an enriched sample of Z0-->bbBAR events, we have measured the difference between the average charged multiplicity of bbBAR and all hadronic Z0 decays to be 2.1+/-1.8(stat)+/-0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for Z0-->bbBAR events is 23.1(12.0)+/-1.8+/-0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in Z0 decays of [x(E)]b =0.62+/-0.10+/-0.04. C1 INDIANA UNIV,BLOOMINGTON,IN 47405. CALTECH,PASADENA,CA 91125. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV HAWAII,HONOLULU,HI 96822. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV COLORADO,BOULDER,CO 80309. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP SCHUMM, BA (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Gomez Cadenas, Juan Jose/L-2003-2014; Chmeissani, Mokhtar/G-4346-2015; Frey, Raymond/E-2830-2016 OI Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Chmeissani, Mokhtar/0000-0002-2287-4791; Frey, Raymond/0000-0003-0341-2636 NR 40 TC 13 Z9 13 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 453 EP 456 DI 10.1103/PhysRevD.46.453 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200045 ER PT J AU KENNEDY, DC AF KENNEDY, DC TI BREMSSTRAHLUNG FOR P(P)BAR PRODUCTION OF CHARMONIUM SO PHYSICAL REVIEW D LA English DT Note ID E+E ANNIHILATION; ANTIPROTON AB Radiation processes affecting the line shapes of charmonium resonances produced in ppBAR annihilation are considered. It is shown that only the soft infrared-enhanced radiation is important and that the ppBAR case is simpler than the e+e- case, taking proper account of the proton's larger mass. RP KENNEDY, DC (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP 461 EP 462 DI 10.1103/PhysRevD.46.461 PG 2 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200047 ER PT J AU ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T ONG, P PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS AF ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T ONG, P PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS TI EXPERIMENTAL PROBES OF FINAL-STATE INTERACTIONS IN D0-MESON DECAYS SO PHYSICAL REVIEW D LA English DT Note ID D+/ DECAYS; DS+/; D0 AB Using data from the Fermilab photoproduction experiment E691, we have measured the branching ratio for the decay D0-->K0-pi-0BAR to be (5.0+/-0.8+/-0.9)%. We see no evidence for the decay D0-->K0K0BAR and set a 90% confidence level upper limit of 0.12%. The large K0-pi-0BAR branching ratio (relative to K-pi+) indicates either a lack of color suppression or significant elastic final-state interactions. The upper limit on the K0K0BAR mode indicates that final-state interactions mix final states such as K+K- or pi+pi- into the K0K0BAR less than 27% of the time at the 90% confidence level. C1 CARLETON UNIV,OTTAWA K1S 5B6,ONTARIO,CANADA. CTR BRASILERO PESQUISAS FIS,BR-22290 RIO DE JANEIRO,BRAZIL. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,UNIVERSITY,MS 38677. NATL RES COUNCIL,OTTAWA K1S 5B6,ONTARIO,CANADA. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV SAO PAULO,BR-01498 SAO PAULO,BRAZIL. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. YALE UNIV,NEW HAVEN,CT 06511. RP ANJOS, JC (reprint author), UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106, USA. RI Anjos, Joao/C-8335-2013 NR 19 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1992 VL 46 IS 1 BP R1 EP R5 DI 10.1103/PhysRevD.46.R1 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA852 UT WOS:A1992JA85200001 ER PT J AU ASAY, BW MCAFEE, JM FERM, EN AF ASAY, BW MCAFEE, JM FERM, EN TI NONSTEADY DETONATION DRIVEN BY A HYPERVELOCITY JET IN A HOMOGENEOUS EXPLOSIVE SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article AB Experiments are reported that show both steady and nonsteady detonation behavior of nitromethane (NM) that is being penetrated supersonically by a shaped-charge jet. The initial jet velocity and diameter were chosen so that prompt detonation (i.e., occurring immediately upon impact) did not occur and threshold initiation behavior could be observed. For the nonsteady case, after the jet entered the explosive, the penetration bow shock strengthened sufficiently to initiate a detonation whose velocity was greater than the jet penetration velocity. However, the diameter over which the reaction was established was insufficient, and the detonation subsequently failed. Upon failure, a penetration bow shock was again established and the initiation process was then repeated. Comparisons are made with results from tests in which jets of different velocities were used and also from tests in which the target material was water. The effects of jet particulation at late times were also observed. RP ASAY, BW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 2 Z9 2 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUL PY 1992 VL 4 IS 7 BP 1558 EP 1565 DI 10.1063/1.858428 PG 8 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HZ842 UT WOS:A1992HZ84200021 ER PT J AU YE, HC KAUFMAN, AN AF YE, HC KAUFMAN, AN TI SELF-CONSISTENT THEORY FOR ION GYRORESONANCE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LINEAR-MODE-CONVERSION; GUIDING-CENTER THEORIES; CONSERVATION-LAWS; MAXWELL-VLASOV; VARIATIONAL FORMULATION; ELECTROMAGNETIC-WAVES; MAGNETIC-FIELD; EIKONAL THEORY; PLASMA; ENERGY AB For describing ion gyroresonance processes, a complete set of self-consistent Vlasov-Maxwell equations is derived by systematically transforming a self-consistent action principle from particle coordinates to guiding-center/oscillation-center coordinates. They include the oscillation-center Vlasov equation; the equations for wave-particle resonant interactions; and Maxwell equations for the background electromagnetic fields. These equations satisfy local conservation laws for energy, momentum, and angular momentum, constructed by using the Noether algorithm. A heuristic interpretation based on the theory of linear mode conversion in ray phase space is also presented for ion gyroresonance processes, which suggests a method for obtaining analytic solutions in general geometry. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP YE, HC (reprint author), UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712, USA. NR 57 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 1735 EP 1753 DI 10.1063/1.860030 PN 1 PG 19 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100006 ER PT J AU MANICKAM, J AF MANICKAM, J TI THE ROLE OF EDGE CURRENT-DENSITY ON KINK MODE-STABILITY AND ITS IMPLICATION FOR MAGNETOHYDRODYNAMIC ACTIVITY ASSOCIATED WITH EDGE LOCALIZED MODES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID HEATED DIVERTOR DISCHARGES; DIII-D; TOKAMAK; CONFINEMENT; ASDEX AB The stability of a plasma equilibrium to the external kink mode is shown to be dependent on the details of the current density near the plasma edge and the value of the safety factor, q, at the edge. The buildup of the current density near the plasma edge is shown to decrease the shear in the safety-factor profile and lead to destabilization of the kink mode. Tokamak plasmas in the high confinement mode of operation have high current density near the edge and are known to exhibit activity referred to as edge localized modes. An important feature of this activity is intermittent bursts of magnetohydrodynamic (MHD) activity near the plasma edge. A model is proposed for the MHD activity in terms of the external kink mode. The role of the plasma geometry and equilibrium profiles is discussed. RP MANICKAM, J (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 16 TC 52 Z9 52 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 1901 EP 1908 DI 10.1063/1.860042 PN 1 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100020 ER PT J AU REJ, DJ TAGGART, DP BARON, MH CHRIEN, RE GRIBBLE, RJ TUSZEWSKI, M WAGANAAR, WJ WRIGHT, BL AF REJ, DJ TAGGART, DP BARON, MH CHRIEN, RE GRIBBLE, RJ TUSZEWSKI, M WAGANAAR, WJ WRIGHT, BL TI HIGH-POWER MAGNETIC-COMPRESSION HEATING OF FIELD-REVERSED CONFIGURATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID QUADRUPOLE STABILIZATION; ROTATIONAL INSTABILITY; ELECTRON-TEMPERATURE; ENERGY CONFINEMENT; TRANSPORT; PLASMAS; FLUX; TRANSLATION; EQUILIBRIUM; TURBULENCE AB Magnetic compression heating experiments at the 1 GW level on field-reversed configuration (FRC) compact toroid plasmas are reported. FRC's formed in a tapered theta-pinch coil have been translated into a single-turn compression coil, where the external magnetic field is slowly raised up to seven times its initial value. Significant electron and ion heating consistent with the expected B4/5 adiabatic scaling is observed, despite significant particle diffusion, which is enhanced during compression. The n = 2 rotational instability is enhanced during compression, but has been controlled to an extent by the application of an external quadrupole field. The particle and flux confinement times, tau(N) and tau(phi), remain approximately equal and decrease roughly with the square of the plasma radius R during compression, implying a constant nonclassical field-null resistivity. The observed tau(N) and tau(phi) magnitudes and scalings are compared with classical and anomalous transport theories, and existing empirical models. Particle diffusion dominates the energy confinement, accounting for three-fourths of the total losses. Upper bounds on the electron thermal diffusivities are estimated. RP REJ, DJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 51 TC 20 Z9 20 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 1909 EP 1919 DI 10.1063/1.860043 PN 1 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100021 ER PT J AU ROGERS, JH HWANG, DQ THOMAS, JC HORTON, RL KILLEEN, J DIMONTE, G AF ROGERS, JH HWANG, DQ THOMAS, JC HORTON, RL KILLEEN, J DIMONTE, G TI BEAT WAVE EXCITATION OF ELECTRON-PLASMA WAVES IN A TOROIDAL MAGNETIZED PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID CURRENT DRIVE; ELECTROMAGNETIC-WAVES AB Electrostatic waves are driven in a toroidal plasma by counterpropapting microwave beams with a difference in frequency approximately equal to the electron plasma frequency. Energetic electrons are detected when the phase velocity of the electrostatic waves are 3v(e) < v(ph) < 7v(e), where v(e) is the electron thermal velocity. Experiments are performed in the Davis Diverted Torus (DDT) [Bull. Am. Phys. Soc. 33, 2049 (1988)] operating in a high repetition rate (15 Hz), low-density (7 X 10(7)-2 X 10(9) cm-3) mode with only a toroidal magnetic field (approximately 110 G). The microwaves are triggered 30-mu-sec after the pulsed discharge ends. At this time the energetic electrons have left the system and the velocity distribution is Maxwellian (T(e) approximately 1 eV). The microwaves have tunable frequencies over the range 8.5-9.5 GHz, and peak powers approximately 180 kW (400 nsec). Bounded plasma modes are excited when the electron cyclotron frequency is larger than the electron plasma frequency. Direct measurements of the wave vector have been made with a double probe antenna, from which the dispersion relation of the electrostatic wave can be obtained. The electron distribution is measured with an electrostatic energy analyzer. The electron velocity distribution function is found to be constant over an interval that extends well beyond the phase velocity of the wave. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ROGERS, JH (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. NR 17 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 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 1920 EP 1926 DI 10.1063/1.860044 PN 1 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100022 ER PT J AU DUNNING, MJ CERJAN, C MOLVIK, AW NASH, JK PHILLIPS, TW VITELLO, PA AF DUNNING, MJ CERJAN, C MOLVIK, AW NASH, JK PHILLIPS, TW VITELLO, PA TI SPECTRAL EMISSION DIAGNOSTICS USING OXYGEN IMPURITIES IN OPTICALLY THIN PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EXTREME-ULTRAVIOLET SPECTRUM; LINE-INTENSITY RATIOS; NE-VII; IONS; RECOMBINATION; COEFFICIENTS AB Emission from oxygen in the vacuum ultraviolet (VUV) spectral range from 140 to 260 angstrom is evaluated as a diagnostic for optically thin plasmas. A one-dimensional Lagrangian, two-fluid hydrodynamic simulation code, which is self-consistently coupled to a comprehensive atomic rate equation model is used for the analysis. This model with the associated atomic rates is described and compared to recent data from laboratory experiments. RP DUNNING, MJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,POB 808 L-35,LIVERMORE,CA 94550, USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 1998 EP 2006 DI 10.1063/1.860053 PN 1 PG 9 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100031 ER PT J AU ABRAHAMSHRAUNER, B LEWIS, HR AF ABRAHAMSHRAUNER, B LEWIS, HR TI A NOTE ON A HAMILTONIAN-FORMULATION OF FORCE-FREE TOROIDAL MAGNETIC-FIELDS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note AB Recently, a formalism was presented for representing magnetic fields with toroidal topology in terms of field-line invariants [Phys. Fluids B 2, 2551 (1990)]. The representation of a field with a nonvanishing toroidal component depends on a transformation from toroidal coordinates to a set of variables consisting of a poloidal angle function, a toroidal flux function, and a toroidal angle function. A restricted class of such transformations was considered for vacuum fields. Here it is shown that this class of transformations for a vacuum or force-free field always requires that the field be axisymmetric. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ABRAHAMSHRAUNER, B (reprint author), WASHINGTON UNIV,DEPT ELECT ENGN,ST LOUIS,MO 63130, USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2024 EP 2025 DI 10.1063/1.860010 PN 1 PG 2 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100035 ER PT J AU PARK, W PARKER, S BIGLARI, H CHANCE, M CHEN, L CHENG, CZ HAHM, TS LEE, WW KULSRUD, R MONTICELLO, D SUGIYAMA, L WHITE, R AF PARK, W PARKER, S BIGLARI, H CHANCE, M CHEN, L CHENG, CZ HAHM, TS LEE, WW KULSRUD, R MONTICELLO, D SUGIYAMA, L WHITE, R TI 3-DIMENSIONAL HYBRID GYROKINETIC-MAGNETOHYDRODYNAMICS SIMULATION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID OSCILLATIONS; EXCITATION; TOKAMAK; MODES AB A three-dimensional (3-D) hybrid gyrokinetic-MHD (magnetohydrodynamic) simulation scheme is presented. To the 3-D toroidal MHD code, MH3D-K the energetic particle component is added as gyrokinetic particles. The resulting code, MH3D-K, is used to study the nonlinear behavior of energetic particle effects in tokamaks, such as the energetic particle stabilization of sawteeth, fishbone oscillations, and alpha-particle-driven toroidal Alfven eigenmode (TAE) modes. C1 MIT,CAMBRIDGE,MA 02139. RP PARK, W (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI chen, liu/I-2297-2013; Cheng, Chio/K-1005-2014 NR 16 TC 78 Z9 78 U1 0 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2033 EP 2037 DI 10.1063/1.860011 PN 2 PG 5 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200002 ER PT J AU HAMMETT, GW DORLAND, W PERKINS, FW AF HAMMETT, GW DORLAND, W PERKINS, FW TI FLUID MODELS OF PHASE MIXING, LANDAU DAMPING, AND NONLINEAR GYROKINETIC DYNAMICS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID TURBULENCE; SIMULATION AB Fluidlike models have long been used to develop qualitative understanding of the drift-wave class of instabilities (such as the ion temperature gradient mode and various trapped-particle modes) which are prime candidates for explaining anomalous transport in plasmas. Here, the fluid approach is improved by developing fairly realistic models of kinetic effects, such as Landau damping and gyroradius orbit averaging, which strongly affect both the linear mode properties and the resulting nonlinear turbulence. Central to this work is a simple but effective fluid model [Phys. Rev. Lett. 64, 3019 (1990)] of the collisionless phase mixing responsible for Landau damping (and inverse Landau damping). This model is based on a nonlocal damping term with a damping rate approximately v(t)\k(parallel-to)\ in the closure approximation for the nth velocity space moment of the distribution function f, resulting in an n-pole approximation of the plasma dispersion function Z. Alternatively, this closure approximation is linearly exact (and therefore physically realizable) for a particular f0 which is close to Maxwellian. "Gyrofluid" equations (conservation laws for the guiding-center density n, momentum mnu(parallel-to), and parallel and perpendicular pressures p(parallel-to) and p(perpendicular-to)) are derived by taking moments of the gyrokinetic equation in guiding-center coordinates rather than particle coordinates. This naturally yields nonlinear gyroradius terms and an important gyroaveraging of the shear. The gyroradius effects in the Bessel functions are modeled with robust Pade-like approximations. These new fluid models of phase mixing and Landau damping are being applied by others to a broad range of applications outside of drift-wave turbulence, including strong Langmuir turbulence, laser-plasma interactions, and the alpha-driven toroidicity-induced Alfven eigenmode (TAE) instability. RP HAMMETT, GW (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Hammett, Gregory/D-1365-2011; Dorland, William/B-4403-2009 OI Hammett, Gregory/0000-0003-1495-6647; Dorland, William/0000-0003-2915-724X NR 26 TC 94 Z9 94 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2052 EP 2061 DI 10.1063/1.860014 PN 2 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200005 ER PT J AU ISLER, RC ACETO, S BAYLOR, LR BIGELOW, TS BELL, GL BELL, JD CARRERAS, BA COLCHIN, RJ CRUME, EC DOMINGUEZ, N DORY, RA DUNLAP, JL DYER, GR ENGLAND, AC GANDY, RF GLOWIENKA, JC HANSON, GR HARRIS, JH HIROE, S HORTON, LD JERNIGAN, TC JI, H LANGLEY, RA LEE, DK LIKIN, KM LYON, JF MA, CH MORIMOTO, S MURAKAMI, M OKADA, H QUALLS, AL RASMUSSEN, DA ROME, JA SATO, M SCHWELBERGER, JG SHATS, MG SIMPKINS, JE THOMAS, CE UCKAN, T WADE, MR WILGEN, JB WING, WR YAMADA, H ZIELINSKI, JJ AF ISLER, RC ACETO, S BAYLOR, LR BIGELOW, TS BELL, GL BELL, JD CARRERAS, BA COLCHIN, RJ CRUME, EC DOMINGUEZ, N DORY, RA DUNLAP, JL DYER, GR ENGLAND, AC GANDY, RF GLOWIENKA, JC HANSON, GR HARRIS, JH HIROE, S HORTON, LD JERNIGAN, TC JI, H LANGLEY, RA LEE, DK LIKIN, KM LYON, JF MA, CH MORIMOTO, S MURAKAMI, M OKADA, H QUALLS, AL RASMUSSEN, DA ROME, JA SATO, M SCHWELBERGER, JG SHATS, MG SIMPKINS, JE THOMAS, CE UCKAN, T WADE, MR WILGEN, JB WING, WR YAMADA, H ZIELINSKI, JJ TI EFFECTS OF MAGNETIC GEOMETRY, FLUCTUATIONS, AND ELECTRIC-FIELDS ON CONFINEMENT IN THE ADVANCED TOROIDAL FACILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID STABILITY AB Recent experiments in the Advanced Toroidal Facility (ATF) [Fusion Technol. 10, 179 (1986)] have been directed toward investigations of the basic physics mechanisms that control confinement in this device. Measurements of the density fluctuations throughout the plasma volume have provided indications for the existence of theoretically predicted dissipative trapped electron and resistive interchange instabilities. These identifications are supported by results of dynamic configuration scans of the magnetic fields during which the magnetic well volume, shear, and fraction of confined trapped particles are changed continuously. The influence of magnetic islands on the global confinement has been studied by deliberately applying error fields which strongly perturb the nested flux-surface geometry, and the effects of electric fields have been investigated by means of biased limiter experiments. C1 RENSSELAER POLYTECH INST,TROY,NY 12180. AUBURN UNIV,AUBURN,AL 36849. GEORGIA INST TECHNOL,ATLANTA,GA 30332. NATL INST FUS SCI,NAGOYA,JAPAN. MOSCOW GEN PHYS INST,MOSCOW,USSR. KYOTO UNIV,KYOTO 606,JAPAN. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP ISLER, RC (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831, USA. RI Shats, Michael/A-8981-2011; OI Shats, Michael/0000-0003-4725-0587; Isler, Ralph/0000-0002-5368-7200 NR 14 TC 11 Z9 11 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2104 EP 2110 DI 10.1063/1.860018 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200011 ER PT J AU WONG, KL DURST, R FONCK, RJ PAUL, SF ROBERTS, DR FREDRICKSON, ED NAZIKIAN, R PARK, HK BELL, M BRETZ, NL BUDNY, R CHENG, CZ COHEN, S HAMMETT, GW JOBES, FC JOHNSON, L MEADE, DM MEDLEY, SS MUELLER, D NAGAYAMA, Y OWENS, DK SABBAGH, S SYNAKOWSKI, EJ AF WONG, KL DURST, R FONCK, RJ PAUL, SF ROBERTS, DR FREDRICKSON, ED NAZIKIAN, R PARK, HK BELL, M BRETZ, NL BUDNY, R CHENG, CZ COHEN, S HAMMETT, GW JOBES, FC JOHNSON, L MEADE, DM MEDLEY, SS MUELLER, D NAGAYAMA, Y OWENS, DK SABBAGH, S SYNAKOWSKI, EJ TI INVESTIGATION OF GLOBAL ALFVEN INSTABILITIES IN THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID EXCITATION; EIGENMODE; WAVES AB Toroidal Alfven eigenmodes (TAE) were excited by the energetic neutral beam ions tangentially injected into plasmas at low magnetic field in the Tokamak Fusion Test Reactor (TFTR) [Proceedings of the 11th International Conference on Plasma Physics and Controlled Fusion Research (IAEA, Vienna, 1987), Vol. 1, p. 51]. The injection velocities were comparable to the Alfven speed. The modes were identified by measurements from Mirnov coils and beam emission spectroscopy (BES). TAE modes appear in bursts whose repetition rate increases with beam power. The neutron emission rate exhibits sawtoothlike behavior and the crashes always coincide with TAE bursts. This indicates ejection of fast ions from the plasma until these modes are stabilized. The dynamics of growth and stabilization were investigated at various plasma currents and magnetic fields. The results indicate that the instability can effectively clamp the number of energetic ions in the plasmas. The observed instability threshold is discussed in light of recent theories. In addition to these TAE modes, intermittent oscillations at three times the fundamental TAE frequency were observed by Mirnov coils, but no corresponding signal was found in BES. It appears that these high-frequency oscillations do not have a direct effect on the plasma neutron source strength. C1 UNIV WISCONSIN,DEPT NUCL ENGN,MADISON,WI 53706. UNIV TEXAS,AUSTIN,TX 78712. COLUMBIA UNIV,NEW YORK,NY 10027. RP WONG, KL (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Sabbagh, Steven/C-7142-2011; Hammett, Gregory/D-1365-2011; Cheng, Chio/K-1005-2014 OI Hammett, Gregory/0000-0003-1495-6647; NR 23 TC 35 Z9 35 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2122 EP 2126 DI 10.1063/1.860462 PN 2 PG 5 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200013 ER PT J AU PHILLIPS, CK HOSEA, J MARMAR, E PHILLIPS, MW SNIPES, J STEVENS, J TERRY, J WILSON, JR BELL, M BITTER, M BOIVIN, R BUSH, C CHENG, CZ DARROW, D FREDRICKSON, E GOLDFINGER, R HAMMETT, GW HILL, K HOFFMAN, D HOULBERG, W HSUAN, H HUGHES, M JASSBY, D MCCUNE, D MCGUIRE, K NAGAYAMA, Y OWENS, DK PARK, H RAMSEY, A SCHILLING, G SCHIVELL, J SMITHE, DN STRATTON, B SYNAKOWSKI, E TAYLOR, G TOWNER, H WHITE, R ZWEBEN, S AF PHILLIPS, CK HOSEA, J MARMAR, E PHILLIPS, MW SNIPES, J STEVENS, J TERRY, J WILSON, JR BELL, M BITTER, M BOIVIN, R BUSH, C CHENG, CZ DARROW, D FREDRICKSON, E GOLDFINGER, R HAMMETT, GW HILL, K HOFFMAN, D HOULBERG, W HSUAN, H HUGHES, M JASSBY, D MCCUNE, D MCGUIRE, K NAGAYAMA, Y OWENS, DK PARK, H RAMSEY, A SCHILLING, G SCHIVELL, J SMITHE, DN STRATTON, B SYNAKOWSKI, E TAYLOR, G TOWNER, H WHITE, R ZWEBEN, S TI ION-CYCLOTRON RANGE OF FREQUENCIES STABILIZATION OF SAWTEETH ON TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID INTERNAL KINK MODES; MAGNETOHYDRODYNAMIC MODES; HIGH-BETA; PLASMAS AB Results obtained from experiments utilizing high-power ion cyclotron range of frequencies (ICRF) heating to stabilize sawtooth oscillations on Tokamak Fusion Test Reactor (TFTR) [Hawryluk et al., Plasma Phys. Controlled Fusion 33, 1509 (1991)] are reviewed. The key observations include existence of a minimum ICRF power required to achieve stabilization, a dependence of the stabilization threshold on the relative size of the ICRF power deposition profile to the q = 1 volume, and a peaking of the equilibrium pressure and current profiles during sawtooth-free phases of the discharges. In addition, preliminary measurements of the poloidal magnetic field profile indicate that q on axis decreases to a value of 0.55 +/- 0.15 after a sawtooth-stabilized period of approximately 0.5 sec has transpired. The results are discussed in the context of theory, which suggests that the fast ions produced by the ICRF heating suppress sawteeth by stabilizing the m = 1 magnetohydrodynamic (MHD) instabilities believed to be the trigger for the sawtooth oscillations. Though qualitative agreement is found between the observations and the theory, further refinement of the theory coupled with more accurate measurements of experimental profiles will be required in order to complete quantitative comparisons. C1 MIT,CAMBRIDGE,MA 02139. GRUMMAN CORP,PRINCETON,NJ 08540. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TOKYO,TOKYO 113,JAPAN. MISSION RES CORP,NEWINGTON,VA 22122. RP PHILLIPS, CK (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Hammett, Gregory/D-1365-2011; Cheng, Chio/K-1005-2014 OI Hammett, Gregory/0000-0003-1495-6647; NR 35 TC 35 Z9 35 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2155 EP 2164 DI 10.1063/1.860484 PN 2 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200017 ER PT J AU FRIEDMAN, A GROTE, DP HABER, I AF FRIEDMAN, A GROTE, DP HABER, I TI 3-DIMENSIONAL PARTICLE SIMULATION OF HEAVY-ION FUSION BEAMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS AB The beams in a heavy-ion-beam-driven inertial fusion (HIF) accelerator are collisionless, nonneutral plasmas, confined by applied magnetic and electric fields. These space-charge-dominated beams must be focused onto small (few mm) spots at the fusion target, and so preservation of a small emittance is crucial. The nonlinear beam self-fields can lead to emittance growth, and so a self-consistent field description is needed. To this end, a multidimensional particle simulation code, WARP [Friedman et al., Part. Accel. 37-38, 131 (1992)], has been developed and is being used to study the transport of HIF beams. The code's three-dimensional (3-D) package combines features of an accelerator code and a particle-in-cell plasma simulation. Novel techniques allow it to follow beams through many accelerator elements over long distances and around bends. This paper first outlines the algorithms employed in WARP. A number of applications and corresponding results are then presented. These applications include studies of. beam drift-compression in a misaligned lattice of quadrupole focusing magnets; beam equilibria, and the approach to equilibrium; and the MBE-4 experiment [AIP Conference Proceedings 152 (AIP, New York, 1986), p. 145] recently concluded at Lawrence Berkeley Laboratory (LBL). Finally, 3-D simulations of bent-beam dynamics relevant to the planned Induction Linac Systems Experiments (ILSE) [Fessenden, Nucl. Instrum. Methods Plasma Res. A 278, 13 (1989)] at LBL are described. Axially cold beams are observed to exhibit little or no root-mean-square emittance growth at midpulse in transiting a (sharp) bend. Axially hot beams, in contrast, do exhibit some emittance growth. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FRIEDMAN, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 100 Z9 99 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2203 EP 2210 DI 10.1063/1.860024 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200022 ER PT J AU LABAUNE, C BATON, S JALINAUD, T BALDIS, HA PESME, D AF LABAUNE, C BATON, S JALINAUD, T BALDIS, HA PESME, D TI FILAMENTATION IN LONG SCALE LENGTH PLASMAS - EXPERIMENTAL-EVIDENCE AND EFFECTS OF LASER SPATIAL INCOHERENCE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID STIMULATED RAMAN-SCATTERING; UNDERDENSE PLASMA; 2ND-HARMONIC EMISSION; BRILLOUIN-SCATTERING; HARMONIC-GENERATION; HOMOGENEOUS PLASMA; BEAM; LIGHT; EVOLUTION; INSTABILITY AB Signatures of filamentation have been observed in preformed plasmas using complementary diagnostics: time-resolved images of the transmitted laser light, dark field imaging, and time-resolved spectra of Raman light. This last diagnostic clearly shows the presence of small channels inside the plasma with temporal evolution in agreement with the formation of filaments. The filamentary structures disappeared when random phase plates were used in the laser beam. This result is in agreement with a theoretical analysis showing that filamentation does not grow when the speckle size is smaller than the perturbation wavelength which maximizes, in the coherent case, the filamentation growth. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. ECOLE POLYTECH,CTR PHYS THEOR,F-91128 PALAISEAU,FRANCE. RP LABAUNE, C (reprint author), ECOLE POLYTECH,UTILISAT LASERS INTENSES LAB,F-91128 PALAISEAU,FRANCE. NR 64 TC 55 Z9 55 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2224 EP 2231 DI 10.1063/1.860027 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200025 ER PT J AU SEKA, W BAHR, RE SHORT, RW SIMON, A CRAXTON, RS MONTGOMERY, DS RUBENCHIK, AE AF SEKA, W BAHR, RE SHORT, RW SIMON, A CRAXTON, RS MONTGOMERY, DS RUBENCHIK, AE TI NONLINEAR LASER-MATTER INTERACTION PROCESSES IN LONG-SCALE-LENGTH PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID STIMULATED RAMAN-SCATTERING; 2-PLASMON DECAY INSTABILITY; HALF-INTEGER HARMONICS; SMOOTHING TECHNIQUES; FILAMENTATION; EMISSION; LIGHT; BEAM; SUPPRESSION; SCALELENGTH AB This paper reports on nonlinear laser-plasma interaction experiments using long-scale-length plasmas produced by the 24-beam OMEGA laser system operating at 351 nm. The experiments were carried out with distributed phase plates (DPP's) in all beams and with and without smoothing by spectral dispersion (SSD). Most of the beams were used to create a large preformed plasma, which had gradient scale lengths of less-than-or-equal-to 800-mu-m at electron densities below a quarter of the critical density n(c) and temperatures in excess of 1 keV. One of the beams, the "interaction beam," was timed independently and tightly focused to intensities approximately 10(15) W/cm2. All beams had pulse durations of approximately 0.6 nsec. The interaction processes studied were mainly Raman scattering and the two-plasmon decay (TPD) instability as evidenced by its characteristic 3/2-harmonic emission. Details of the Raman and 3/2-harmonic spectra are presented. Evidence was found for the TPD instability close to its Landau cutoff density at approximately 0.2n(c). Raman emission was narrow-band and observed only from densities < 0.2n(c). For late timings of the interaction beam, the Raman emission appeared to originate from near the peak of the density profile, but for earlier timings it appeared to come from densities a factor of 2 below the calculated peak. Application of SSD affected the 3/2-harmonic emission only slightly, but it strongly reduced the Raman emission. A discussion is given of some models that attempt to explain these observations. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. ACAD SCI USSR,NOVOSIBIRSK,USSR. RP SEKA, W (reprint author), UNIV ROCHESTER,LASER ENERGET LAB,250 E RIVER RD,ROCHESTER,NY 14623, USA. OI Montgomery, David/0000-0002-2355-6242 NR 49 TC 46 Z9 46 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2232 EP 2240 DI 10.1063/1.860191 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200026 ER PT J AU COOPER, WS AF COOPER, WS TI NEUTRAL BEAM INJECTORS FOR THE INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS AB The International Thermonuclear Experimental Reactor (ITER) has been proposed as the next major step in the development of fusion power [International Thermonuclear Experimental Reactor (ITER), Establishment of ITER: Relevant Documents, International Atomic Energy Agency, Vienna (1988)]. During the Conceptual Design Activity, deuterium neutral beams were chosen for heating, driving current, and controlling the current profile in the central region of the ITER plasma. In order to penetrate to the center of the ITER plasma, an energy of 1.3 MeV is required, an order of magnitude higher than in existing neutral beam systems. The neutral beam system must deliver 75 MW of D0 to the plasma, with a pulse length that ultimately will reach two weeks. The neutral injection system will consist of nine modules, and will be based on D- ion sources and novel high-current dc accelerators optimized for flexible operation and control of breakdowns. The negative ions can be converted to neutrals in gas or plasma targets, with a resulting system efficiency of 40% to 50%. The successful development and operation of neutral beam injectors for ITER will be a major step toward the application of neutral beams on power reactors. RP COOPER, WS (reprint author), LAWRENCE BERKELEY LAB,MAILSTOP 4-230,BERKELEY,CA 94720, USA. NR 25 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2300 EP 2306 DI 10.1063/1.860200 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200035 ER PT J AU MACGOWAN, BJ DASILVA, LB FIELDS, DJ KEANE, CJ KOCH, JA LONDON, RA MATTHEWS, DL MAXON, S MROWKA, S OSTERHELD, AL SCOFIELD, JH SHIMKAVEG, G TREBES, JE WALLING, RS AF MACGOWAN, BJ DASILVA, LB FIELDS, DJ KEANE, CJ KOCH, JA LONDON, RA MATTHEWS, DL MAXON, S MROWKA, S OSTERHELD, AL SCOFIELD, JH SHIMKAVEG, G TREBES, JE WALLING, RS TI SHORT WAVELENGTH X-RAY LASER RESEARCH AT THE LAWRENCE-LIVERMORE-NATIONAL-LABORATORY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DIELECTRONIC RECOMBINATION; COLLISIONAL-EXCITATION; SELENIUM; IONS; HOLOGRAPHY AB Laboratory x-ray lasers are currently being studied by researchers worldwide. This paper reviews some of the recent work carried out at Lawrence Livermore National Laboratory. Laser action has been demonstrated at wavelengths as short as 35.6 angstrom while saturation of the small signal gain has been observed with longer wavelength schemes. Some of the most successful schemes to date have been collisionally pumped x-ray lasers that use the thermal electron distribution within a laser-produced plasma to excite electrons from closed shells in neon- and nickel-like ions to metastable levels in the next shell. Attempts to quantify and improve the longitudinal and transverse coherence of collisionally pumped x-ray lasers are motivated by the desire to produce sources for specific applications. Toward this goal there is a large effort underway to enhance the power output of the Ni-like Ta x-ray laser at 44.83 angstrom as a source for x-ray imaging of live cells. Improving the efficiency of x-ray lasers in order to produce saturated output with smaller pump lasers is also a goal of this work. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP MACGOWAN, BJ (reprint author), LAWRENCE LIVERMORE NATL LAB, L-476,POB 808, LIVERMORE, CA 94550 USA. NR 60 TC 167 Z9 169 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2326 EP 2337 DI 10.1063/1.860203 PN 2 PG 12 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200038 ER PT J AU KIDDER, RE AF KIDDER, RE TI UNITED-STATES NUCLEAR STOCKPILE SAFETY - REVIEW NO-2 SO PHYSICS TODAY LA English DT Letter RP KIDDER, RE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1992 VL 45 IS 7 BP 14 EP 14 DI 10.1063/1.2809721 PG 1 WC Physics, Multidisciplinary SC Physics GA JB862 UT WOS:A1992JB86200005 ER PT J AU DAVIS, JC KAY, DA AF DAVIS, JC KAY, DA TI IRAQ SECRET NUCLEAR-WEAPONS PROGRAM SO PHYSICS TODAY LA English DT Article C1 URANIUM INST,LONDON,ENGLAND. RP DAVIS, JC (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECT,LIVERMORE,CA 94550, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1992 VL 45 IS 7 BP 21 EP 27 DI 10.1063/1.881312 PG 7 WC Physics, Multidisciplinary SC Physics GA JB862 UT WOS:A1992JB86200012 ER PT J AU BENABIB, M CONGDON, JD AF BENABIB, M CONGDON, JD TI METABOLIC AND WATER-FLUX RATES OF FREE-RANGING TROPICAL LIZARDS SCELOPORUS-VARIABILIS SO PHYSIOLOGICAL ZOOLOGY LA English DT Article ID CNEMIDOPHORUS-TIGRIS; ENERGY-EXPENDITURE; HOME RANGE; MERRIAMI; SIZE; CONSEQUENCES; CONSTRAINTS; ENERGETICS; PROXIMATE AB Daily activity periods, thermal profiles, and stomach contents of Sceloporus variabilis (7.7 g mean body mass) were studied at Bastonal (1,000 m elevation) and Monte Pio (45 m elevation) in southern Veracruz, Mexico. Metabolic rates of free-ranging lizards were measured during late summer using doubly labeled water and were compared to values for temperate sceloporine lizards. Lizards were active from about 0800 hours to 1800 hours. Mean body temperatures of lizards averaged 28.9-degrees-C at Bastonal and 32.4-degrees-C at Monte Pio. Water-influx rates averaged 132 and 108 mL CO2 (kg d)-1 at Bastonal and Monte Pio, respectively. Metabolic rates measured in the field were not different at the two sites and when combined averaged 0.40 mL (g h)-1 or 240 J (g d)-1. Metabolic rates averaged about 6.5 times estimated resting metabolic rate, and activity metabolism accounted for 73% of total respiration. Water-influx rates of S. variabilis are about 4.5 times higher and field metabolic rates are about 1.6 times higher than similar values reported for temperate sceloporine lizards. The increased metabolic and water-influx rates in S. variabilis are apparently due to a combination of greater availability of food and water, favourable thermal conditions, and a higher level of foraging activity and movements than those of temperate sceloporine lizards. C1 UNIV GEORGIA,INST ECOL,ATHENS,GA 30602. UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 36 TC 29 Z9 30 U1 2 U2 8 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0031-935X J9 PHYSIOL ZOOL JI Physiol. Zool. PD JUL-AUG PY 1992 VL 65 IS 4 BP 788 EP 802 PG 15 WC Physiology; Zoology SC Physiology; Zoology GA JH670 UT WOS:A1992JH67000006 ER PT J AU KENNEDY, AC BOLTON, H STROO, HF ELLIOTT, LF FREDRICKSON, JK AF KENNEDY, AC BOLTON, H STROO, HF ELLIOTT, LF FREDRICKSON, JK TI COMPETITIVE ABILITIES OF TN5 TOX- MUTANTS OF A RHIZOBACTERIUM INHIBITORY TO WHEAT GROWTH SO PLANT AND SOIL LA English DT Article DE ANTIBIOSIS; COMPETITIVE ABILITY; DELETERIOUS RHIZOBACTERIA; PSEUDOMONAS SP; RHIZOSPHERE; TOXIN; TRANSPOSON ID PSEUDOMONAS-SYRINGAE; FLUORESCENT PSEUDOMONADS; TRANSPOSON MUTAGENESIS; PACIFIC NORTHWEST; CROP RESIDUES; BACTERIA; RHIZOSPHERE; PATHOGENS; BIOCONTROL; SURVIVAL AB Antibiosis has been thought to impart a competitive advantage to soil microorganisms. A rhizobacterium of the genus Pseudomonas produces a toxin that inhibits the growth of other microorganisms and winter wheat (Triticum aestivum L.). The bacterium was mutagenized with the Tn5 transposon to obtain toxin-negative (Tox-) mutants or was selected for its spontaneous resistance to rifampicin. Tox- mutants were used to determine the role of the toxin in wheat root inhibition, root colonization, and rhizosphere competitiveness. Four Tox- (loss of inhibition of both E. coli and wheat root growth) and four partial Tox+ (partial loss of inhibition of E. coli and wheat root growth) Tn5 mutants were isolated. Seven of the mutants had different Tn5 chromosomal insertions, which suggests that toxin production is the result of several gene loci. Competitive root-colonization abilities of the Tox- isolates were studied in winter wheat rhizospheres using varied population levels in autoclaved and nonautoclaved soil. Toxin production did not affect the competitive abilities of these organisms with native soil microflora. Results here indicate that toxin production by these organisms is not the primary mechanism of their competitive advantage in root colonization. Thus, opportunities exist for biological control of plant-suppressive bacteria using these Tox- strains. C1 REMEDIAT TECHNOL INC, KENT, WA 98032 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. USDA, ARS, CORVALLIS, OR 97331 USA. RP KENNEDY, AC (reprint author), USDA ARS, PULLMAN, WA 99164 USA. RI Bolton, Harvey/E-5583-2011 NR 40 TC 6 Z9 6 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0032-079X J9 PLANT SOIL JI Plant Soil PD JUL PY 1992 VL 144 IS 1 BP 143 EP 153 DI 10.1007/BF00018855 PG 11 WC Agronomy; Plant Sciences; Soil Science SC Agriculture; Plant Sciences GA JH432 UT WOS:A1992JH43200017 ER PT J AU KIELECZAWA, J COUGHLAN, SJ HIND, G AF KIELECZAWA, J COUGHLAN, SJ HIND, G TI ISOLATION AND CHARACTERIZATION OF AN ALKALINE-PHOSPHATASE FROM PEA THYLAKOIDS SO PLANT PHYSIOLOGY LA English DT Article ID PROTEIN PHOSPHATASE; ELECTRON-TRANSPORT; PHOSPHOPROTEINS; PURIFICATION; MECHANISM; ASSAY; LIGHT AB Endogenous dephosphorylation of the light-harvesting chlorophyll-protein complex of photosystem II in pea (Pisum sativum, L. cv Progress 9) thylakoids drives the state 2 to state 1 transition; the responsible enzyme is a thylakoid-bound, fluoride-sensitive phosphatase with a pH optimum of 8.0 (Bennett J [1980] Eur J Biochem 104: 85-89). An enzyme with these characteristics was isolated from well-washed thylakoids. Its molecular mass was estimated at 51.5 kD, and this monomer was catalytically active, although the activity was labile. The active site could be labeled with orthophosphate at pH 5.0. High levels of alkaline phosphatase activity were obtained with the assay substrate, 4-methylumbelliferyl phosphate (350 micromoles per minute per milligram purified enzyme). The isolated enzyme functioned as a phosphoprotein phosphatase toward phosphorylated histone III-S and phosphorylated, photosystem II-enriched particles from pea, with typical activities in the range of 200 to 600 picomoles per minute per milligram enzyme. These activities all had a pH optimum of 8.0 and were fluoride sensitive. The enzyme required magnesium ion for maximal activity but was not dependent on this ion. Evidence supporting a putative function for this phosphatase in dephosphorylation of thylakoid proteins came from the inhibition of this process by a polyclonal antibody preparation raised against the partially purified enzyme. C1 BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. NR 33 TC 15 Z9 16 U1 0 U2 1 PU AMER SOC PLANT BIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA SN 0032-0889 EI 1532-2548 J9 PLANT PHYSIOL JI Plant Physiol. PD JUL PY 1992 VL 99 IS 3 BP 1029 EP 1036 DI 10.1104/pp.99.3.1029 PG 8 WC Plant Sciences SC Plant Sciences GA JG584 UT WOS:A1992JG58400036 PM 16668967 ER PT J AU RUSSELL, LB HUNSICKER, PR CACHEIRO, NLA RINCHIK, EM AF RUSSELL, LB HUNSICKER, PR CACHEIRO, NLA RINCHIK, EM TI GENETIC, CYTOGENETIC, AND MOLECULAR ANALYSES OF MUTATIONS INDUCED BY MELPHALAN DEMONSTRATE HIGH-FREQUENCIES OF HERITABLE DELETIONS AND OTHER REARRANGEMENTS FROM EXPOSURE OF POSTSPERMATOGONIAL STAGES OF THE MOUSE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE NATURE OF SPECIFIC-LOCUS MUTATIONS; QUALITATIVE ANALYSIS OF MUTATIONS; EFFECT OF GERM-CELL STAGE ID LOCUS TEST; TYROSINASE; CDNA; EXPRESSION; REGION; BROWN AB Specific-locus experiments have previously shown melphalan to be mutagenic in all male germ-cell stages tested and particularly so in early spermatids. All but 2 of 24 specific-locus mutations recovered were tested genetically, cytogenetically, and/or molecularly. At least 12 of 15 tested mutations recovered from postspermatogonial stages but only 1 of 7 mutations recovered from stem-cell or differentiating spermatogonia gave evidence of being deletions or other rearrangements. Melphalan-induced mutations, thus, confirm the pattern of dependence of mutation structure on germ-cell stage that had been shown earlier for other chemicals. Results of the present investigation illustrate the capabilities of combined genetic, cytogenetic, and molecular analyses for characterizing the nature of specific-locus mutations. Fine-structure molecular mapping of long regions surrounding specific loci has been greatly facilitated by the availability of genetic reagents (particularly, deletion complexes) generated in specific-locus experiments over the course of decades. Reciprocally, this mapping permits increasingly detailed characterization of the nature of lesions induced by mutagenic exposures of germ cells, adding great powers for qualitative analysis of mutations to the specific-locus test. Cytogenetic and genetic investigations also provide evidence on lesion type, especially for loci at which mutations cannot yet be analyzed molecularly. Melphalan, like chlorambucil, can generate many mutations, a high proportion of which are deletions and other rearrangements, making this chemical valuable for generating mutations (at any locus) amenable to molecular access. RP RUSSELL, LB (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [222Y01-ES-10067] NR 24 TC 26 Z9 26 U1 1 U2 1 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 1 PY 1992 VL 89 IS 13 BP 6182 EP 6186 DI 10.1073/pnas.89.13.6182 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JC868 UT WOS:A1992JC86800099 PM 1352884 ER PT J AU BIEGON, A GREUNER, N AF BIEGON, A GREUNER, N TI AGE-RELATED-CHANGES IN SEROTONIN 5HT(2) RECEPTORS ON HUMAN BLOOD-PLATELETS SO PSYCHOPHARMACOLOGY LA English DT Article DE SEROTONIN RECEPTORS; KETANSERINE; PLATELET ID HUMAN BRAIN POSTMORTEM; BINDING-SITES; AUTORADIOGRAPHIC ANALYSIS; FRONTAL-CORTEX; SUICIDE AB Serotonin receptors of the 5HT2 type were labeled on platelet membranes using tritiated ketanserine. Blood was collected from the umbilical cord of newborns and venous samples were collected from 6-year-old children as well as junior-high and high school students (ages 13 through 18) to determine age-related changes in receptor binding. Among the ages sampled, the highest levels of 5HT2 receptor binding were found in 6-year-olds. A sharp decline in receptor binding occured during adolescence, with levels reduced by half between ages 13 and 17. This pattern is similar to the one we have observed in brain 5HT2 receptors postmortem. There were no significant sex differences in 5HT2 receptors on platelets in newborn and young children. A trend towards higher binding in girls appears around the onset of menstruation in teenage girls (age 14 and up). These results demonstrate that platelet 5HT2 receptors can serve as a model for age dependent changes in 5HT2 receptors in the brain. C1 CARMEL HOSP,DEPT BIOCHEM,HAIFA,ISRAEL. CARMEL HOSP,BIOCHEM RES UNIT,HAIFA,ISRAEL. RP BIEGON, A (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 17 TC 21 Z9 22 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0033-3158 J9 PSYCHOPHARMACOLOGY JI Psychopharmacology PD JUL PY 1992 VL 108 IS 1-2 BP 210 EP 212 DI 10.1007/BF02245309 PG 3 WC Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA HZ555 UT WOS:A1992HZ55500033 PM 1410140 ER PT J AU BLAKELY, EA AF BLAKELY, EA TI CELL INACTIVATION BY HEAVY CHARGED-PARTICLES SO RADIATION AND ENVIRONMENTAL BIOPHYSICS LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON HEAVY CHARGED PARTICLES IN BIOLOGY AND MEDICINE CY SEP 23-25, 1991 CL DARMSTADT, GERMANY SP GESELL SCHWERIONENFORSCH ID FISSION-SPECTRUM NEUTRONS; AM-241 ALPHA-PARTICLES; LOW-ENERGY PROTONS; CO-60 GAMMA-RAYS; MAMMALIAN-CELLS; ONCOGENIC TRANSFORMATION; IONIZING-RADIATION; ESCHERICHIA-COLI; STRAND BREAKS; WILD-TYPE AB The inactivation of cells resulting in lethal or aberrant effects by charged particles is of growing interest. Charged particles at extremely high LET are capable of completely eliminating cell-type and cell-line differences in repair capacity. It is still not clear however whether the repair systems are inactivated, or merely that heavy-ion lesions are less repairable. Studies correlating the particle inactivation dose of radioresistant cells with intact DNA analyzed with pulse field gel electrophoresis and other techniques may be useful, but more experiments are also needed to assess the fidelity of repair. For particle irradiations between 40-100 keV/mu-m there is however evidence for particle-induced activation of specific genes in mammalian cells, and certain repair processes in bacteria. New data are available on the inactivation of developmental processes in several systems including seeds, and cells of the nematode C. elegans. Future experimental and theoretical modeling research emphasis should focus on exploring particle-induced inactivation of endpoints assessing functionality and not just lethality, and on analyzing molecular damage and genetic effects arising in damaged but non-inactivated survivors. The discrete nature of selective types of particle damage as a function of radiation quality indicates the value of accelerated ions as probes of normal and aberrant biological processes. Information obtained from molecular analyses of damage and repair must however be integrated into the context of cellular and tissue functions of the organism. RP BLAKELY, EA (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BLDG 70A-1118,BERKELEY,CA 94720, USA. NR 84 TC 47 Z9 54 U1 2 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-634X J9 RADIAT ENVIRON BIOPH JI Radiat. Environ. Biophys. PD JUL PY 1992 VL 31 IS 3 BP 181 EP 196 DI 10.1007/BF01214826 PG 16 WC Biology; Biophysics; Environmental Sciences; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Environmental Sciences & Ecology; Radiology, Nuclear Medicine & Medical Imaging GA JB070 UT WOS:A1992JB07000002 PM 1502327 ER PT J AU CASTRO, JR PETTI, PL DAFTARI, IK COLLIER, JM RENNER, T LUDEWIGT, B CHU, W PITLUCK, S FLEMING, T ALONSO, J BLAKELY, E AF CASTRO, JR PETTI, PL DAFTARI, IK COLLIER, JM RENNER, T LUDEWIGT, B CHU, W PITLUCK, S FLEMING, T ALONSO, J BLAKELY, E TI CLINICAL GAIN FROM IMPROVED BEAM DELIVERY SYSTEMS SO RADIATION AND ENVIRONMENTAL BIOPHYSICS LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON HEAVY CHARGED PARTICLES IN BIOLOGY AND MEDICINE CY SEP 23-25, 1991 CL DARMSTADT, GERMANY SP GESELL SCHWERIONENFORSCH ID OPTIMIZATION; ALGORITHM; THERAPY AB The feasibility of dynamic conformal heavy charged particle radiotherapy has been investigated at UCLBL, and shows high promise of: 1. an improved therapeutic ratio and 2. reduction in the number of treatment portals required for efficient treatment delivery. Assessment of dose to tumor and critical structures for several anatomical sites have been carried out using a normal tissue complication algorithm developed at LBL. For high-LET charged particle treatment delivery, dynamic conformal therapy using a raster scanned beam with variable modulation and multileaf collimator appears to be the optimal technique for treatment delivery. RP CASTRO, JR (reprint author), LAWRENCE BERKELEY LAB,BLDG 55-121,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA19138] NR 21 TC 12 Z9 12 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-634X J9 RADIAT ENVIRON BIOPH JI Radiat. Environ. Biophys. PD JUL PY 1992 VL 31 IS 3 BP 233 EP 240 DI 10.1007/BF01214830 PG 8 WC Biology; Biophysics; Environmental Sciences; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Environmental Sciences & Ecology; Radiology, Nuclear Medicine & Medical Imaging GA JB070 UT WOS:A1992JB07000006 PM 1502331 ER PT J AU BECK, BL HENJUM, DC ANTONIJCZUK, K ZAHARIA, O KORZA, G OZOLS, J HOPFER, SM BARBER, AM SUNDERMAN, FW AF BECK, BL HENJUM, DC ANTONIJCZUK, K ZAHARIA, O KORZA, G OZOLS, J HOPFER, SM BARBER, AM SUNDERMAN, FW TI PNIXA, A NI2+-BINDING PROTEIN IN XENOPUS OOCYTES AND EMBRYOS, SHOWS IDENTITY TO EP45, AN ESTROGEN-REGULATED HEPATIC SERPIN SO RESEARCH COMMUNICATIONS IN CHEMICAL PATHOLOGY AND PHARMACOLOGY LA English DT Article ID AMINO-ACID-SEQUENCE; FETAX PROCEDURE; RANA-PIPIENS; INHIBITOR; LAEVIS; GENE; IDENTIFICATION; TERATOGENICITY; EXPRESSION; INDUCTION AB A Ni2+-binding protein (pNiXa, 45 kD, pI 8.5) discovered in Xenopus embryos, was isolated from oocytes. Based on amino acid sequences, pNiXa belongs to the serpin superfamily and shows identity to the cDNA sequence of Ep45, an estrogen-regulated hepatic serpin that contains an (HX) n-motif found in eukaryotic transcription factors. Nondenatured pNiXa, purified by Ni-affinity chromatography, inhibited bovine alpha-chymotrypsin. The presence of pNiXa in embryos when they are susceptible to Ni2+, the high avidity of pNiXa for Ni2+, and the (HX) n-motif point to pNiXa as a molecular target of Ni2+-teratogenesis. C1 UNIV CONNECTICUT, SCH MED, DEPT LAB MED, FARMINGTON, CT 06030 USA. UNIV CONNECTICUT, SCH MED, DEPT BIOCHEM, FARMINGTON, CT 06030 USA. UNIV CONNECTICUT, SCH MED, DEPT PHARMACOL, FARMINGTON, CT 06030 USA. US DOE, DIV HLTH SCI & LIFE SCI RES, WASHINGTON, DC 20585 USA. FU NIEHS NIH HHS [ES-05331] NR 34 TC 28 Z9 28 U1 1 U2 1 PU P J D PUBLICATIONS LTD PI WESTBURY PA PO BOX 966, WESTBURY, NY 11590 USA SN 0034-5164 J9 RES COMMUN CHEM PATH PD JUL PY 1992 VL 77 IS 1 BP 3 EP 16 PG 14 WC Pathology; Pharmacology & Pharmacy SC Pathology; Pharmacology & Pharmacy GA JG220 UT WOS:A1992JG22000001 PM 1439178 ER PT J AU PENN, CW BASSFORD, PJ YELTON, DB DUNN, J NELSON, DR FUKUNAGA, M STANEK, G AF PENN, CW BASSFORD, PJ YELTON, DB DUNN, J NELSON, DR FUKUNAGA, M STANEK, G TI GENETIC APPROACHES TO CELL BIOLOGY AND METABOLISM OF SPIROCHETES SO RESEARCH IN MICROBIOLOGY LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL MEETING ON THE MOLECULAR BIOLOGY OF SPIROCHETES CY OCT 21-23, 1991 CL ANNECY, FRANCE SP MARDX DIAGNOST, MEDIMMUNE & SPECIALTY LABS, FDN MARCEL MERIEUX, ABBOTT LABS, BIOCHIM, CONNAUGHT LABS, FT DODGE LABS, HOECHST ROUSSEL DE SPIROCHETE, GENETICS, BIOSYNTHESIS; PATHWAYS, METABOLISM, HEAT SHOCK PROTEINS, ENZYMATIC PROFILES, RNA ID HEAT-SHOCK RESPONSE; RIBOSOMAL-RNA GENES; TREPONEMA-PALLIDUM; LEPTOSPIRA-INTERROGANS; IDENTIFICATION; PROTEIN; CLONING AB Genetic analysis and methodology have only comparatively recently been applied to the study of spirochetes. Although genetic transfer procedures for spirochetes are not widely available, there are several examples of progress in genetic analysis of spirochetes by other approaches. Some examples of these approaches are the following. 1) Genes for synthetic pathways in Treponema and Leptospira have been cloned by complementation of Escherichia coli serving as plasmid hosts. 2) The OspA protein of Borrelia burgdorferi has been overexpressed in E. coli without the signal peptide; the recombinant product has been suitable for circular dichroism as well as other biochemical analyses. 3) The heat shock proteins of B. burgdorferi are homologous to heat shock proteins of E. coli. 4) Enzyme activity profiles of B. burgdorferi and other spirochetes show strain heterogeneity and also indicate which biosynthetic and enzymatic activities are conserved within different spirochetes. 5) The gene organization of rRNA genes have revealed differences between spirochetes and other types of bacteria. C1 UNIV N CAROLINA,DEPT MICROBIOL & IMMUNOL,CHAPEL HILL,NC 27514. W VIRGINIA UNIV,DEPT MICROBIOL & IMMUNOL,MORGANTOWN,WV 26506. BROOKHAVEN NATL LAB,DEPT BIOL,HLTH SCI CTR 2095,UPTON,NY 11973. UNIV RHODE ISL,DEPT MICROBIOL,KINGSTON,RI 02881. UNIV FUKUYAMA,FAC PHARM & PHARMACEUT SCI,FUKUYAMA,HIROSHIMA 72902,JAPAN. UNIV VIENNA,INST HYG,A-1010 VIENNA,AUSTRIA. RP PENN, CW (reprint author), UNIV BIRMINGHAM,SCH BIOL SCI,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. NR 25 TC 3 Z9 3 U1 0 U2 1 PU EDITIONS SCIENTIFIQUES ELSEVIER PI PARIS CEDEX 15 PA 141 RUE JAVEL, 75747 PARIS CEDEX 15, FRANCE SN 0923-2508 J9 RES MICROBIOL JI Res. Microbiol. PD JUL-AUG PY 1992 VL 143 IS 6 BP 605 EP 613 DI 10.1016/0923-2508(92)90118-8 PG 9 WC Microbiology SC Microbiology GA JM117 UT WOS:A1992JM11700008 PM 1475521 ER PT J AU CARR, R KINCAID, B HASSENZAHL, W AF CARR, R KINCAID, B HASSENZAHL, W TI CORRELATION BETWEEN MEASURED UNDULATOR MAGNETIC-FIELDS AND X-RAY-SPECTRA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID RADIATION AB Electron storage ring insertion devices, especially undulators, are designed using ideal device theory and the resulting x-ray spectra are reasonably close to predictions in most cases. However, magnetic field errors result in nonideal x-ray spectra. These effects can be calculated theoretically, and may also be measured. Here we present a study of an undulator whose magnetic fields and x-ray spectra have been measured carefully. We compare experiment and theory and explain the deviation from ideal of the shape of the undulator's spectral peaks in terms of magnet errors. C1 LAWRENCE BERKELEY LAB,ADV LIGHT SOURCE,BERKELEY,CA 94720. RP CARR, R (reprint author), STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1992 VL 63 IS 7 BP 3564 EP 3568 DI 10.1063/1.1143765 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JC048 UT WOS:A1992JC04800003 ER PT J AU GRABER, T ZAJFMAN, D KANTER, EP NAAMAN, R VAGER, Z ZABRANSKY, BJ AF GRABER, T ZAJFMAN, D KANTER, EP NAAMAN, R VAGER, Z ZABRANSKY, BJ TI A SOURCE OF COLD MOLECULAR-IONS FOR COULOMB EXPLOSION IMAGING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INFRARED-SPECTRUM AB A specialized ion source for use in the high voltage terminal of an electrostatic accelerator has been developed to produce vibrationally cold beams of molecular ions. A pulsed valve is used to produce a supersonic expansion of the source gas which is ionized by electron impact near the beginning of the free expansion. Because of the harsh electromagnetic environment in the terminal, special care has been taken to protect the electronic components related to the ion source. The effect of vibrational cooling in the supersonic expansion is demonstrated using Coulomb explosion techniques with a He2+ beam. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. RP GRABER, T (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 26 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1992 VL 63 IS 7 BP 3569 EP 3574 DI 10.1063/1.1143766 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JC048 UT WOS:A1992JC04800004 ER PT J AU KAMPERSCHROER, JH GRISHAM, LR KUGEL, HW OCONNOR, TE STEVENSON, TN VONHALLE, A WILLIAMS, MD AF KAMPERSCHROER, JH GRISHAM, LR KUGEL, HW OCONNOR, TE STEVENSON, TN VONHALLE, A WILLIAMS, MD TI MEASUREMENT OF THERMAL ION PROFILES IN TFTR NEUTRAL BEAMLINES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID FUSION TEST REACTOR; BEAM; 120-KV AB A technique is described whereby the ion dumps inside the TFTR Neutral Beam Test Stand were used to measure thermal profiles of the full-, half-, and third-energy ions. 136 thermocouples were installed on the full-energy ion dump, allowing full beam contours. Additional linear arrays across the widths of the half- and third-energy ion dumps provided a measure of the shape, in the direction parallel to the grid rails, of the half- and third-energy ions, and, hence, of the molecular ions extracted from the source. As a result of these measurements, it was found that the magnet was more weakly focusing, by a factor of 2, than expected, explaining past overheating of the full-energy ion dump. Hollow profiles on the half- and third-energy ion dumps were observed, suggesting that extraction of D2+ and D3+ is primarily from the edge of the ion source. If extraction of half-energy ions is from the edge of the accelerator, a divergence parallel to the grid rails of 0.6-degrees +/- 0.1-degrees is deduced. It is postulated that a nonuniform gas profile near the accelerator is the cause of the hollow partial-energy ion profiles, the pressure being depressed over the accelerator by particles passing through this highly transparent structure. Primary electrons reaching the accelerator produce nonuniform densities of D2+ through the ionization of this gas. D3+ is created through subsequent D2+-gas collisions. A technique of rastering the ion beam across the full-energy dump was examined as a means of reducing the power density. By unbalancing the currents in the two coils of the magnet, on a shot-by-shot basis, by up to a 2:1 ratio, it was possible to move the centerline of the full-energy ion beam sideways by approximately 12.5 cm. The adoption of such a technique, with a ramp of the coil imbalance from 2:1 to 1:2 over a beam pulse, could reduce the full-energy ion dump power density by a factor of > 1.5. RP KAMPERSCHROER, JH (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 25 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1992 VL 63 IS 7 BP 3701 EP 3709 DI 10.1063/1.1143601 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JC048 UT WOS:A1992JC04800026 ER PT J AU RASOLT, M TESANOVIC, Z AF RASOLT, M TESANOVIC, Z TI THEORETICAL ASPECTS OF SUPERCONDUCTIVITY IN VERY HIGH MAGNETIC-FIELDS SO REVIEWS OF MODERN PHYSICS LA English DT Article ID DENSITY-FUNCTIONAL THEORY; ONE-DIMENSIONAL CONDUCTORS; HIGH-TC SUPERCONDUCTORS; ELECTRON-GAS; PERTURBATION-SERIES; PHASE-TRANSITIONS; LATTICE; HC2; QUANTIZATION; INSTABILITY AB This paper reviews the progress made in the last few years in theoretical understanding of the properties of superconductors in very high magnetic fields. The key ingredient in the new understanding is the recognition that the usual negative effect of orbital frustration in a superconducting state, reflected in diamagnetic pair breaking, is obviated when all electrons reside in only the few lowest Landau levels. A new relation between the superconducting order parameter and the magnetic field now exists which permits a strong enhancement of the critical temperature with increasing magnetic field. The issue of Pauli pair breaking and the effect of impurities in this new state are also discussed, along with the important observation that the attractive component of the effective electron-electron interaction in systems with low carrier density is enhanced with increasing magnetic field. While this paper emphasizes the theoretical aspects of this high-field limit, it does present a unified picture of superconductivity throughout the whole temperature and magnetic-field phase diagram. Numerical applications to simple models of low-carrier-density semiconductors and semimetals are also discussed, since these materials are the most likely candidates for this new phase. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA. NR 74 TC 166 Z9 167 U1 4 U2 16 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 EI 1539-0756 J9 REV MOD PHYS JI Rev. Mod. Phys. PD JUL PY 1992 VL 64 IS 3 BP 709 EP 754 DI 10.1103/RevModPhys.64.709 PG 46 WC Physics, Multidisciplinary SC Physics GA JE342 UT WOS:A1992JE34200003 ER PT J AU REISTER, DB AF REISTER, DB TI A NEW WHEEL CONTROL-SYSTEM FOR THE OMNIDIRECTIONAL HERMIES-III ROBOT SO ROBOTICA LA English DT Article DE HERMIES-III ROBOT; CONTROL SYSTEM; OMNIDIRECTIONAL AB We have designed, built, and tested a new wheel control system for the HERMIES-Ill robot. HERMIES-III is a large mobile robot with omnidirectional steering that is designed for human scale experiments. During each cycle (at 20 Hz), the wheel control system moves the robot toward a goal and calculates the current position of the robot. The system has seven modes for moving to a goal and the goal may be changed during motion of the robot. RP REISTER, DB (reprint author), OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,POB 2008,BLDG 6025,MS-6364,OAK RIDGE,TN 37831, USA. NR 0 TC 9 Z9 9 U1 1 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0263-5747 J9 ROBOTICA JI Robotica PD JUL-AUG PY 1992 VL 10 BP 351 EP 360 PN 4 PG 10 WC Robotics SC Robotics GA JA885 UT WOS:A1992JA88500007 ER PT J AU LIU, CT AF LIU, CT TI ENVIRONMENTAL EMBRITTLEMENT AND GRAIN-BOUNDARY FRACTURE IN NI3AL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID BASE L12 ALLOYS; HYDROGEN EMBRITTLEMENT; INTERMETALLIC COMPOUND; TENSILE PROPERTIES; ORDERED ALLOYS; AL-ALLOYS; DUCTILITY; BORON; STRENGTH; FEAL RP LIU, CT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 44 TC 144 Z9 155 U1 3 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1992 VL 27 IS 1 BP 25 EP 28 DI 10.1016/0956-716X(92)90313-4 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HX937 UT WOS:A1992HX93700005 ER PT J AU WADSWORTH, J DOUGHERTY, SE KRAMER, PA NIEH, TG AF WADSWORTH, J DOUGHERTY, SE KRAMER, PA NIEH, TG TI EVIDENCE FOR DISLOCATION GLIDE CONTROLLED CREEP IN NIOBIUM-BASE ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID SOLID-SOLUTION ALLOYS; BEHAVIOR C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. RP WADSWORTH, J (reprint author), LOCKHEED MISSILES & SPACE CO,DIV RES & DEV,O-93-10,B204,3251 HANOVER ST,PALO ALTO,CA 94304, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 29 TC 9 Z9 9 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1992 VL 27 IS 1 BP 71 EP 76 DI 10.1016/0956-716X(92)90322-6 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HX937 UT WOS:A1992HX93700014 ER PT J AU JAYARAM, R MILLER, MK AF JAYARAM, R MILLER, MK TI AN ATOM PROBE FIELD-ION MICROSCOPE CHARACTERIZATION OF PRECIPITATES IN A MODEL VANADIUM ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID BASE ALLOYS RP JAYARAM, R (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 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 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1992 VL 27 IS 1 BP 77 EP 82 DI 10.1016/0956-716X(92)90323-7 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HX937 UT WOS:A1992HX93700015 ER PT J AU GROPP, WD KEYES, DE AF GROPP, WD KEYES, DE TI DOMAIN DECOMPOSITION WITH LOCAL MESH REFINEMENT SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE DOMAIN DECOMPOSITION; ELLIPTIC PROBLEMS; PARALLEL ALGORITHMS; MESH REFINEMENT ID PARTIAL-DIFFERENTIAL EQUATIONS; BOUNDARY-VALUE-PROBLEMS; ELLIPTIC PROBLEMS; SYSTEMS AB A preconditioned Krylov iterative algorithm based on domain decomposition for linear systems arising from implicit finite-difference or finite-element discretizations of partial differential equation problems requiring local mesh refinement is described. To keep data structures as simple as possible for parallel computing applications, the fundamental computational unit in the algorithm is defined as a subregion of the domain spanned by a locally uniform tensor-product grid, called a tile. In the tile-based domain decomposition approach, two levels of discretization are considered at each point of the domain: a global coarse grid defined by tile vertices only, and a local fine grid where the degree of resolution can vary from tile to tile. One global level and one local level provide the flexibility required to adaptively discretize a diverse collection of problems on irregular regions and solve them at convergence rates that deteriorate only logarithmically in the finest mesh parameter, with the coarse tessellation held fixed. A logarithmic departure from optimality seems to be a reasonable compromise for the simplicity of the composite grid data structure and concomitant regular data exchange patterns in a multiprocessor environment. Some experiments with up to 1024 tiles are reported, and the evolution of the algorithm is commented on and contrasted with optimal nonrefining two-level algorithms and optimal refining multilevel algorithms. Computational comparisons with some other popular methods are presented. C1 YALE UNIV,DEPT MECH ENGN,NEW HAVEN,CT 06520. RP GROPP, WD (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 47 TC 20 Z9 20 U1 0 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JUL PY 1992 VL 13 IS 4 BP 967 EP 993 DI 10.1137/0913057 PG 27 WC Mathematics, Applied SC Mathematics GA HZ284 UT WOS:A1992HZ28400008 ER PT J AU GEE, GW CAMPBELL, MD CAMPBELL, GS CAMPBELL, JH AF GEE, GW CAMPBELL, MD CAMPBELL, GS CAMPBELL, JH TI RAPID MEASUREMENT OF LOW SOIL-WATER POTENTIALS USING A WATER ACTIVITY METER SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article AB Water potential is one of the most important physical properties of soil but remains among the most difficult to measure reliably. We describe a water activity meter that can be conveniently used to measure water potentials in soils ranging in wetness from near saturation to air dry (water potentials from - 0.4 to < - 100 MPa). The meter senses the dew point of water vapor with a miniature cooled mirror located above a soil sample in a closed chamber Readings for individual samples are obtained rapidly (2-5 min). Accuracy of the measurement is checked periodically using saturated soil solutions. Repeatability of measurements was found to be equal or better than the rated precision (+/- 0.003 activity units). Water potentials (calculated from water activities using the Kelvin equation) were obtained for soils ranging in texture from sand to clay. The meter was used on soil samples taken from sites near Richland, WA, and summertime water potentials were found to be as low as -264 MPa. C1 DECAGON DEVICES, PULLMAN, WA 99163 USA. WASHINGTON STATE UNIV, DEPT CROP & SOIL SCI, PULLMAN, WA 99164 USA. RP GEE, GW (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 4 TC 97 Z9 98 U1 0 U2 14 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1992 VL 56 IS 4 BP 1068 EP 1070 PG 3 WC Soil Science SC Agriculture GA JQ168 UT WOS:A1992JQ16800010 ER PT J AU ZACHARA, JM SMITH, SC RESCH, CT COWAN, CE AF ZACHARA, JM SMITH, SC RESCH, CT COWAN, CE TI CADMIUM SORPTION TO SOIL SEPARATES CONTAINING LAYER SILICATES AND IRON AND ALUMINUM-OXIDES SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID TRACE-METALS; ADSORPTION CHARACTERISTICS; EXTRACTION TECHNIQUES; CHROMATE ADSORPTION; WATER INTERFACE; SURFACE; COPPER; SEDIMENTS; COMPLEXATION; SPECIATION AB Ion exchange to fixed charge sites and surface complexation to hydroxylated sites are recognized to affect Cd aqueous concentrations in soil; however, the individual contribution of these reactions to Cd sorption in mineralogically complex material has not been documented. The objective of this study was to isolate the contributions of fixed charge and hydroxylated sites to Cd sorption in two Ultisol subsurface horizons that contained kaolinite, 2:1 layer silicates, and crystalline Fe and Al oxides. Cadmium sorption was measured on clay-sized isolates (< 2.0 mum) from the soil materials in NaClO4 electrolyte at ionic strength (I) = 0.1, 0.01, and 0.001 mol L-1 with pH ranging from 4 to 9 and Cd concentrations ranging from 2 x 10(-8) to 3 x 10(-5) mol L-1. Comparative experiments were also performed with smectite (SWy-1), kaolinite (KGa-1), and crystalline and amorphous Fe oxides to evaluate the potential contribution of ion exchange and surface complexation reactions on these phases to Cd sorption in the isolates. Ion exchange of Cd2+ on layer silicates dominated Cd sorption within the isolates when I was less-than-or-equal-to 0.01 mol L-1 and the pH was less than almost-equal-to 6.5. Sorption of Cd on hydroxylated sites on the edges of the layer silicates or on Fe or Al oxides, and/or exchange of CdOH+ on the fixed-charge sites of the layer silicates, dominated Cd sorption at I = 0.1 mol L-1, and when the pH was greater than almost-equal-to 6.5 at any I. Below pH 6.5, the magnitude of the sorption was controlled by the cation-exchange capacity of the isolates, which. in turn, was related to their relative proportions of kaolinite and 2:1 layer silicates. By comparing the Cd sorption on the isolates to that on (i) dithionite-citrate-bicarbonate (DCB) treated islates and (ii) DCB-treated isolates augmented with Fe oxides, it was concluded that crystalline Fe oxides were not significant sorbents of Cd. Instead, the Fe oxides appeared to be associated with the layer silicates by a particle interaction that blocked access of Cd to fixed-charge sited on the layer silicates. C1 PROCTER & GAMBLE CO, IVORYDALE TECH CTR, CINCINNATI, OH 45217 USA. RP ZACHARA, JM (reprint author), PACIFIC NW LAB, DEPT GEOSCI, MSIN K3-61,POB 999, RICHLAND, WA 99352 USA. NR 69 TC 83 Z9 90 U1 0 U2 5 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1992 VL 56 IS 4 BP 1074 EP 1084 PG 11 WC Soil Science SC Agriculture GA JQ168 UT WOS:A1992JQ16800012 ER PT J AU COWAN, CE ZACHARA, JM SMITH, SC RESCH, CT AF COWAN, CE ZACHARA, JM SMITH, SC RESCH, CT TI INDIVIDUAL SORBENT CONTRIBUTIONS TO CADMIUM SORPTION ON ULTISOLS OF MIXED MINERALOGY SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID METAL-IONS; WATER INTERFACE; ADSORPTION; OXIDE; COPPER; MONTMORILLONITE; SEDIMENTS; CHROMATE; SURFACES AB A multisite model was applied to Cd-sorption data across a range in pH and at ionic strength (I) = 0.1 and 0.01 on specimen layer silicates and on untreated and dithionite-citrate-bicarbonate (DCB) treated isolates from two Utisols. The two isolates contained different mass concentrations of kaolinite, 2:1 layer silicates, Al-substituted crystalline Fe oxides, and gibbsite. The multisite model included the exchange of Cd2+ on fixed-charge sites on the layer silicates, complexation to hydroxyl sites on the layer silicate, and Fe oxides, and electrostatic interaction between positively charged sites on Fe oxides and fixed-charge sites on the layer silicates. Site concentrations for the specimen layer silicates and DCB-treated and untreated isolates were estimated from cation-exchange capacity (CEC) data and N2-specific surface area. Equilibrium constants for specific surface re. actions were. estimated from Cd-sorption data on the specimen layer silicates, KGa-1 and SWy-1, and the DCB-treated soil isolates. The combined modeling results indicated that (i) Cd2+ ion exchange to fixed-charge sites was the dominant sorption reaction for pH < 6.5 and I = 0.01, (ii) mass action with Na suppressed ion exchange at I = 0.01, (iii) Cd complexation to hydroxyl sites produced strong pH dependency in Cd sorption and was responsible for all the Cd sorption at I = 0.01 and above pH 6.5 at I = 0.01, and (iv) Fe oxides decreased Cd sorption by blocking access of Cd to exchange sites. The modeling results were unable to determine whether Fe oxides were important sorbents for Cd. Either with or without Cd sorption on Fe oxides, this model was able to describe the Cd sorption on the soil isolates reasonably well. C1 PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RP COWAN, CE (reprint author), PROCTER & GAMBLE CO, IVORYDALE TECH CTR, 5299 SPRING GROVE AVE, CINCINNATI, OH 45217 USA. NR 33 TC 35 Z9 36 U1 0 U2 6 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1992 VL 56 IS 4 BP 1084 EP 1094 PG 11 WC Soil Science SC Agriculture GA JQ168 UT WOS:A1992JQ16800013 ER PT J AU VANMIEGROET, H HOMANN, PS COLE, DW AF VANMIEGROET, H HOMANN, PS COLE, DW TI SOIL-NITROGEN DYNAMICS FOLLOWING HARVESTING AND CONVERSION OF RED ALDER AND DOUGLAS-FIR STANDS SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID CLIMAX ECOSYSTEMS; NITRIFICATION; FOREST; MINERALIZATION; NITRATE; INHIBITION; GRADIENT; TANNINS; LOSSES; RATES AB Drastic reductions in NO3- leaching have been observed after harvesting of mature red alder (Alnus rubra Bong.) stands. Our objective was to examine whether these reduction were linked to changes in soil N dynamics. Adjacent alder and Douglas fir [Pseudotsuga menziessii (Mirbel.) Franco] stands on young glacial soils (Alderwood; a loamy-skeletal, mixed, mesic, ortstein Aquic Haplorthod) in western Washington were harvested and replanted with either alder or Douglas fir seedlings; reference plots were established in nearby undisturbed Three years after site conversion, when NO3- leaching declined most drastically in the harvested alder plots, net N mineralization and net nitrification in the upper soil were determined seasonally by in situ incubation using the buried-bag technique. There were no significant increased in soil NH4-N during incubation, indicating that nitrification rates closely followed net N mineralization in all plots. In the N-poor soils of the harvested and uncut Douglas fir plots, nitrification was consistently <2 mug N g-1 per 30 d. In the N-rich alder reference plot, nitrification was highest in summer (52 mug N g-1 per 30 d), lowest in winter (4 mug N g-1), and intermediate in spring (20 mug N g-1). Seasonal fluctuations in nitrification diminished in the harvested alder plots. Nitrification rates were significantly lower than in the uncut alder plot in summer only (5-9 mug N g-1 per 30 d), but this difference was insufficient to account for the lower NO3- leaching rates in the conversion plots. Soils in the harvested plots were drier and experienced greater temperature extremes, but these changes did not correlate well with the variability in N-mineralization rates between uncut and harvested alder plots. Nitrification was positively correlated to soil temperature in the uncut alder plot only. The establishment of red alder seedlings did not appear to have influenced the N dynamics in either N-poor or N-rich soils. C1 OREGON STATE UNIV,DEPT FOREST SCI,CORVALLIS,OR 97331. UNIV WASHINGTON,COLL FOREST RESOURCES,SEATTLE,WA 98195. RP VANMIEGROET, H (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Van Miegroet, Helga/A-1925-2012 NR 52 TC 34 Z9 35 U1 1 U2 8 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1992 VL 56 IS 4 BP 1311 EP 1318 PG 8 WC Soil Science SC Agriculture GA JQ168 UT WOS:A1992JQ16800050 ER PT J AU LAKS, DB MAGRI, R ZUNGER, A AF LAKS, DB MAGRI, R ZUNGER, A TI DIAMOND-LIKE ORDER IN ZINCBLENDE COMPOUNDS SO SOLID STATE COMMUNICATIONS LA English DT Article ID BAND OFFSETS; GAAS; ENERGIES AB We show that the energy of substitutional randomization of atoms in zinc-blende compounds is surprisingly small. This suggests the existence of a new class of defects in these materials ("random aggregates"), which consist of regions of less than or similar to 10 atoms where the sites of the diamond lattice are randomly occupied by A or B atoms in place of the ordered AB crystal occupancy. The structural and electronic properties of these defects are outlined. RP LAKS, DB (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013; Magri, Rita/O-5267-2016 OI Magri, Rita/0000-0003-2945-0374 NR 15 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUL PY 1992 VL 83 IS 1 BP 21 EP 26 DI 10.1016/0038-1098(92)90006-U PG 6 WC Physics, Condensed Matter SC Physics GA JD237 UT WOS:A1992JD23700005 ER PT J AU PICKERING, IJ LEWANDOWSKI, JT JACOBSON, AJ GOLDSTONE, JA AF PICKERING, IJ LEWANDOWSKI, JT JACOBSON, AJ GOLDSTONE, JA TI A NEUTRON POWDER DIFFRACTION STUDY OF THE ORDERING IN LIXNI1-XO SO SOLID STATE IONICS LA English DT Article ID MAGNESIUM-OXIDE; METHANE; CATALYSTS AB Lithium nickel oxide phases, LixNi1-xO (x=0.400, 0.347, 0.320) have been synthesized by direct solid state reaction of Li2CO3 and NiO. The structures and cation distribution have been determined at ambient temperature and 60 K from time of flight neutron powder diffraction data collected on the Neutron Powder Diffractometer at LANSCE, Los Alamos National Laboratory. The rhombohedral distortion and the order parameter characterizing the lithium distribution have been determined as x decreases. The partitioning of Ni2+ and Ni3+ between the two layers has been inferred from the average metal-oxygen bond lengths for the two inequivalent sites. C1 UNIV HOUSTON, DEPT CHEM, HOUSTON, TX 77204 USA. LOS ALAMOS NATL LAB, LANSCE, LOS ALAMOS, NM 87545 USA. RP PICKERING, IJ (reprint author), EXXON RES & ENGN CO, CORP RES, ROUTE 22 E, ANNANDALE, NJ 08801 USA. RI Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 28 TC 27 Z9 27 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 405 EP 412 DI 10.1016/0167-2738(92)90407-G PN 1 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP968 UT WOS:A1992JP96800050 ER PT J AU BATES, JB DUDNEY, NJ GRUZALSKI, GR ZUHR, RA CHOUDHURY, A LUCK, CF ROBERTSON, JD AF BATES, JB DUDNEY, NJ GRUZALSKI, GR ZUHR, RA CHOUDHURY, A LUCK, CF ROBERTSON, JD TI ELECTRICAL-PROPERTIES OF AMORPHOUS LITHIUM ELECTROLYTE THIN-FILMS SO SOLID STATE IONICS LA English DT Article ID CONDUCTIVE GLASSES; PHOSPHATE-GLASSES; AC CONDUCTIVITY; NITROGEN; MODEL AB The impedance of xLi2O-ySiO2-zP2O5 thin films deposited by RF-magnetron sputtering was analyzed using two models in which the frequency dependence of the bulk response was represented by: (1) a Cole-Cole dielectric function and (2) a constant phase angle element. Increases in the conductivity with Li2O concentration and with addition of SiO2 to Li2O-P2O5 compositions are attributed to an increase in Li+ mobility caused by changes in the film structure. A new amorphous oxynitride electrolyte, Li3-3PO3.9N0.17, prepared by sputtering Li3PO4 in N2, has a conductivity al 25-degrees-C of 2 X 10(-6) S/cm and is stable in contact with lithium. C1 UNIV KENTUCKY, LEXINGTON, KY 40502 USA. RP BATES, JB (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RI Dudney, Nancy/I-6361-2016 OI Dudney, Nancy/0000-0001-7729-6178 NR 25 TC 211 Z9 223 U1 21 U2 135 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 647 EP 654 DI 10.1016/0167-2738(92)90442-R PN 1 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP968 UT WOS:A1992JP96800085 ER PT J AU DUDNEY, NJ BATES, JB ZUHR, RA LUCK, CF ROBERTSON, JD AF DUDNEY, NJ BATES, JB ZUHR, RA LUCK, CF ROBERTSON, JD TI SPUTTERING OF LITHIUM COMPOUNDS FOR PREPARATION OF ELECTROLYTE THIN-FILMS SO SOLID STATE IONICS LA English DT Article AB Several lithium compounds have been sputtered in a planar rf magnetron source. Lithium orthophosphate was observed to sputter normally and nearly stoichiometric films were obtained. Sputtering of lithium orthosilicate, however, resulted in extremely lithium deficient films. This was due to the decomposition of the target and the segregation of large amounts of Li2O to the unsputtered areas of the surface of the target. C1 UNIV KENTUCKY, DEPT CHEM, LEXINGTON, KY 40506 USA. RP DUDNEY, NJ (reprint author), OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. RI Dudney, Nancy/I-6361-2016 OI Dudney, Nancy/0000-0001-7729-6178 NR 6 TC 18 Z9 21 U1 6 U2 26 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 655 EP 661 DI 10.1016/0167-2738(92)90443-S PN 1 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP968 UT WOS:A1992JP96800086 ER PT J AU BLOOM I HASH, MC ZEBROWSKI, JP MYLES, KM KRUMPELT, M AF BLOOM, I HASH, MC ZEBROWSKI, JP MYLES, KM KRUMPELT, M TI OXIDE-ION CONDUCTIVITY OF BISMUTH ALUMINATES SO SOLID STATE IONICS LA English DT Article AB Novel compounds in the Bi-Al-O and La-Bi-Al-O systems were prepared and tested for conductivity at high temperatures (500-800-degrees-C) in an oxygen gradient cell. The purpose is to develop an electrolyte material that will permit operation of a solid oxide fuel cell at 500-800-degrees-C instead of the 1000-degrees-C now used. The Bi-Al-O and La-Bi-Al-O compounds were found to have conductivities of about 10(-2) OMEGA-1 cm-1 and 10(-1) OMEGA-1 cm-1 at 800-degrees-C, respectively, in an oxygen gradient and may have the needed conductivity and stability toward humidified hydrogen for use as fuel cell electrolytes. RP BLOOM I (reprint author), ARGONNE NATL LAB, DIV CHEM TECHNOL, ELECTROCHEM TECHNOL PROGRAM, ARGONNE, IL 60439 USA. NR 13 TC 38 Z9 38 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 739 EP 747 DI 10.1016/0167-2738(92)90249-O PN 2 PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP972 UT WOS:A1992JP97200006 ER PT J AU MARTIN, SW PATEL, HK BORSA, F TORGESON, D AF MARTIN, SW PATEL, HK BORSA, F TORGESON, D TI MULTIPLE FREQUENCY SPIN-LATTICE RELAXATION-TIME AND CONDUCTIVITY MEASUREMENTS OF FIC LI2S+SIS(2)GLASSES SO SOLID STATE IONICS LA English DT Article ID ELECTRICAL RELAXATION; GLASSES AB The glass series Li2S+SiS2 is known to be one of the very best fast Li+ ion-conducting glasses and for this reason, it has provided a unique opportunity to examine both the nuclear spin-lattice relaxation (NSLR) of the Li-7+ cation and the ionic conductivity over wide and overlapping regions of frequency and temperature. Since the decoupling indices for these glasses are so high, a wide temperature range above the NSLR rate maximum (in the frequency-independent regime) can be observed and compared directly to the frequency-independent conductivity. As expected, activation energies compared in this way agree very well and this result is used to resolve the long-standing disagreement that has existed between conductivity and spin-lattice relaxation rate measurements. The frequency-dependent region of the relaxation has been modeled using both the empirical time-domain Kohl-rausch-Williams-Watts function and the Cole-Davidson distribution of relaxation times model. Using a frequency range of 4-40 MHz, the first multiple frequency and simultaneous fit of the NSLR rate, R1, to these functions is provided. Though both functions appear to fit the data well, the KWW function is shown to give the better fit. More important is the result that just as the frequency-dependent conductivity can be fit to a relaxation function over wide ranges of frequency and temperature, so can the NSLR rate. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. RP MARTIN, SW (reprint author), IOWA STATE UNIV SCI & TECHNOL, DEPT MAT SCI & ENGN, AMES, IA 50011 USA. NR 15 TC 10 Z9 10 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 1141 EP 1147 DI 10.1016/0167-2738(92)90303-7 PN 2 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP972 UT WOS:A1992JP97200060 ER PT J AU MITCHELL, TJ MORRIS, MD AF MITCHELL, TJ MORRIS, MD TI BAYESIAN DESIGN AND ANALYSIS OF COMPUTER EXPERIMENTS - 2 EXAMPLES SO STATISTICA SINICA LA English DT Article DE BAYESIAN PREDICTION; COMPUTER MODEL; COMBUSTION; COMPRESSION MOLDING; INTERPOLATION; OPTIMAL DESIGN; STOCHASTIC PROCESS AB In a computer experiment, the data are produced by a computer program that models a physical system. The experiment consists of a set of model runs; the design of the experiment specifies the choice of program inputs for each run. This paper demonstrates two applications of a Bayesian method for the design and analysis of computer experiments to predict model output corresponding to input values for which the model has not been run. When the original code is long-running, the fast predictor produced by this method can serve as an efficient, though approximate, substitute. The models used in the two examples are (i) a computer model for the combustion of methane and (ii) a computer model that simulates the compression molding of sheet molding compound in the manufacture of an automobile hood. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. NR 11 TC 31 Z9 32 U1 0 U2 3 PU STATISTICA SINICA PI WINNIPEG PA C/O DR S W CHENG,MANAG EDITOR DEPT STAT UNIV MANTOBA, WINNIPEG MB R3T 2N2, CANADA SN 1017-0405 J9 STAT SINICA JI Stat. Sin. PD JUL PY 1992 VL 2 IS 2 BP 359 EP 379 PG 21 WC Statistics & Probability SC Mathematics GA JQ012 UT WOS:A1992JQ01200003 ER PT J AU DATTA, RP HIRA, AS RAY, AK WIENKE, BR AF DATTA, RP HIRA, AS RAY, AK WIENKE, BR TI A NOTE ON 2-D ELECTRON-TRANSPORT USING DISCRETE ORDINATES SO SUPERCOMPUTER LA English DT Article ID PLASMAS AB 2-D electron transport calculations were performed using a discrete ordinates technique. Under some simplifying assumptions several cases were considered. This work is aimed at estimating resources required for a more complete modeling of the electron transport problem. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP UNIV TEXAS, DEPT PHYS, POB 19059, ARLINGTON, TX 76019 USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ASFRA PI EDAM PA VOORHAVEN 33, 1135 BL EDAM, NETHERLANDS SN 0168-7875 J9 SUPERCOMPUTER JI Supercomputer PD JUL PY 1992 VL 9 IS 4 BP 15 EP 21 PG 7 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods SC Computer Science GA JM810 UT WOS:A1992JM81000003 ER PT J AU KU, YS OVERBURY, SH AF KU, YS OVERBURY, SH TI SURFACE-STRUCTURE ANALYSIS OF SN ON NI(111) BY LOW-ENERGY ALKALI ION-SCATTERING SO SURFACE SCIENCE LA English DT Article ID ALLOY; NIAL(110); SULFUR; NICKEL AB Low-energy Li+ ion scattering, LEED and AES were applied to analyze the surface structure of Sn on Ni(111). It was found that annealing Sn-covered surfaces with initial coverages from 1/3 to larger than 1 ML gave rise to a stable p(square-root 3 x square-root 3)R30-degrees LEED pattern with a coverage of 1/3 ML. Polar and azimuthal incidence angle dependences of Li+ ion scattering were measured for the clean and Sn-covered surfaces and were used to determine the surface geometry by analysis of shadowing and blocking features. The ion scattering data suggest that Sn incorporates into the first Ni layer but protruding 0.046 +/- 0.004 nm above the Ni plane for the p(square-root 3 x square-root 3)R30-degrees structure. The conclusion that Sn is incorporated was further confirmed by comparison with corresponding data obtained for p(2 x 2)-sulfur/Ni(111) known to form an overlayer structure and previous results for isostructural Sn/Pt(111). C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 27 TC 28 Z9 29 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1992 VL 273 IS 3 BP 341 EP 352 DI 10.1016/0039-6028(92)90071-D PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JD783 UT WOS:A1992JD78300016 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI THE BONDING OF ACETATE, METHOXY, THIOMETHOXY AND PYRIDINE TO CU SURFACES - A MOLECULAR-ORBITAL STUDY SO SURFACE SCIENCE LA English DT Article ID TRANSITION-METAL COMPLEXES; ELECTRON-ENERGY LOSS; PHOTOELECTRON DIFFRACTION; COPPER SURFACES; COORDINATION CHEMISTRY; INTERMEDIATE NEGLECT; THERMAL-DESORPTION; METHANOL SYNTHESIS; CRYSTAL-SURFACES; DIPOLE-MOMENTS AB The bonding of acetate (CH3COO), methoxy (CH3O), thiomethoxy (CH3S) and pyridine (C5H5N) to copper surfaces has been examined employing semi-empirical MO-SCF calculations (INDO/S) and metal clusters of limited size (Cu(n), n = 16 or 18 atoms). CH3COO, CH3O and CH3S behave as electron acceptors when adsorbed. For these species, the chemisorption bond is dominated by the interaction between the LUMO of the adsorbate and the Cu(4s, 4p) bands. The relatively weak C-S bond in CH3Sa makes decomposition to form sulfur adatoms and alkanes a very exothermic process (- DELTA-H = 20 to 30 kcal/mol). In contrast, similar types of decomposition reactions for CH3Oa are almost thermoneutral (as a consequence of a strong C-O bond), and the molecule prefers to decompose forming H2COa and H(a) species. The results of a thermochemical analysis indicate that reactions which involve the cleavage of S-H and/or C-S bonds of alkanethiols are very exothermic on copper. The bonding mechanism of pyridine involves a large charge transfer from the 7a1 and 2b1 orbitals of the molecule into the Cu(4s, 4p) orbitals, and a very small electron transfer from the substrate into the C-N antibonding 3b1 orbital of the adsorbate (pi-backbonding). The fact that Cu is poor at pi-backdonation makes the metal inactive for pyridine decomposition. On the basis of these INDO/S results, the possible UPS spectra of CH3O and CH3S On Cu(111), and of CH3COO and C5H5N on Cu(110) are discussed and compared with experimental results. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 108 TC 27 Z9 27 U1 1 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 JUL 1 PY 1992 VL 273 IS 3 BP 385 EP 404 DI 10.1016/0039-6028(92)90076-I PG 20 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JD783 UT WOS:A1992JD78300021 ER PT J AU SCHROTT, AG FRANKEL, GS DAVENPORT, AJ ISAACS, HS JAHNES, CV RUSSAK, MA AF SCHROTT, AG FRANKEL, GS DAVENPORT, AJ ISAACS, HS JAHNES, CV RUSSAK, MA TI CR LVV AUGER EMISSION AND PHOTOREDUCTION OF HEXAVALENT CR OXIDES - REPLY SO SURFACE SCIENCE LA English DT Letter C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP SCHROTT, AG (reprint author), IBM CORP,DIV RES,TJ WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. RI Davenport, Alison/J-6089-2013 OI Davenport, Alison/0000-0003-0853-515X NR 4 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1992 VL 273 IS 3 BP L480 EP L481 DI 10.1016/0039-6028(92)90061-A PG 2 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JD783 UT WOS:A1992JD78300006 ER PT J AU VOLKOW, ND HITZEMANN, R WANG, GJ FOWLER, JS WOLF, AP DEWEY, SL HANDLESMAN, L AF VOLKOW, ND HITZEMANN, R WANG, GJ FOWLER, JS WOLF, AP DEWEY, SL HANDLESMAN, L TI LONG-TERM FRONTAL BRAIN METABOLIC CHANGES IN COCAINE ABUSERS SO SYNAPSE LA English DT Article DE POSITRON EMISSION; TOMOGRAPHY; ADDICTION; FDG ID POSITRON EMISSION TOMOGRAPHY; CHRONIC-SCHIZOPHRENIA; INTRACRANIAL HEMORRHAGE; GLUCOSE-UTILIZATION; COMPLICATIONS; STROKE; CRACK AB Neurological complications from cocaine use are well recognized. We propose that chronic cocaine use can also cause clinically silent brain dysfunction. We investigated brain glucose metabolism with positron emission tomography (PET) and 2-deoxy-2[F-18] fluoro-D-glucose (FDG) in 21 neurologically intact chronic cocaine abusers (C) and 18 normal controls (N). The cocaine abusers were tested 1-6 weeks after the last use of cocaine and seven were retested after a 3 month drug-free period. Global cerebral glucose metabolism was not significantly different between controls and cocaine abusers (N = 38.4 +/- 3, C = 36.5 +/- 5-mu-mol/100 g of tissue, min). However, cocaine abusers had significantly (P < 0.05) lower metabolic activity in 16 of the 21 left frontal regions and 8 of the 21 right frontal regions. These decreases persisted after 3-4 months of detoxification and were correlated with the dose (P less-than-or-equal-to 0.01) and the years of cocaine use (P less-than-or-equal-to 0.05). This study shows reduced rates of frontal metabolism in neurologically intact cocaine abusers that persist even after 3-4 months of detoxification. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. VET ADM MED CTR,NORTHPORT,NY 11768. VET ADM MED CTR,BRONX,NY 10468. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. FU NIDA NIH HHS [R01 DA 06278]; NINDS NIH HHS [NS 15638] NR 46 TC 251 Z9 256 U1 5 U2 12 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 JUL PY 1992 VL 11 IS 3 BP 184 EP 190 DI 10.1002/syn.890110303 PG 7 WC Neurosciences SC Neurosciences & Neurology GA JA307 UT WOS:A1992JA30700002 PM 1636149 ER PT J AU HACKER, BC AF HACKER, BC TI THE TRANSFORMATION OF WAR - VANCREVELD,M SO TECHNOLOGY AND CULTURE LA English DT Book Review RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD JUL PY 1992 VL 33 IS 3 BP 630 EP 631 DI 10.2307/3106670 PG 2 WC History & Philosophy Of Science SC History & Philosophy of Science GA JM310 UT WOS:A1992JM31000032 ER PT J AU CAVE, RJ XANTHEAS, SS FELLER, D AF CAVE, RJ XANTHEAS, SS FELLER, D TI EXPLOITING REGULARITY IN SYSTEMATIC SEQUENCES OF WAVE-FUNCTIONS WHICH APPROACH THE FULL CI LIMIT SO THEORETICA CHIMICA ACTA LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON AB INITIO METHODS IN QUANTUM CHEMISTRY CY MAY 10, 1991 CL AMES, IA DE CI LIMIT; SYSTEMATIC SEQUENCES OF WAVE-FUNCTIONS; WAVE-FUNCTIONS, FULL CI LIMIT ID CONFIGURATION-INTERACTION CALCULATIONS; PERTURBATION-THEORY; BENCHMARK CALCULATIONS; ABINITIO; ENERGIES; N-2; H2O; HF AB The ground state total energy and related 1-electron properties are computed for three small molecules (N2, H2O, and H2CN) using several systematic sequences of wavefunctions which approach the full CI. These sequences include multireference CI, averaged coupled pair functional and quasidegenerate variational perturbation theory wavefunctions. It is demonstrated that sufficient regularity exists in the sequence of variationally computed energies to permit extrapolation to the full CI limit using simple analytic expressions. It is further-more demonstrated that a subset of the original list of configurations employed in the normal singles and doubles CI procedure can be selected using second order perturbation theory without adversely affecting the extrapolation to the full CI limit. This significantly broadens the range of applicability of the method. Along these lines, a scheme is proposed for the extrapolation of the selected CI results to the zero threshold (i.e. unselected) values in cases where the numbers of configurations associated with the latter would render the calculations intractable. Due to the vast reduction in the number of configurations which are handled variationally, the proposed scheme makes it possible to derive estimates of the full CI limit in cases where explicit full CI is either very difficult or currently impossible. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP CAVE, RJ (reprint author), HARVEY MUDD COLL, DEPT CHEM, CLAREMONT, CA 91711 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 29 TC 38 Z9 38 U1 0 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD JUL PY 1992 VL 83 IS 1-2 BP 31 EP 55 DI 10.1007/BF01113242 PG 25 WC Chemistry, Physical SC Chemistry GA JF164 UT WOS:A1992JF16400005 ER PT J AU YOUNG, RA AF YOUNG, RA TI EFFECTS OF DUVERNOY GLAND SECRETIONS FROM THE EASTERN HOGNOSE SNAKE, HETERODON-PLATIRHINOS, ON SMOOTH-MUSCLE AND NEUROMUSCULAR-JUNCTION SO TOXICON LA English DT Note AB Duvernoy's gland secretions (100-mu-g/ml) from the eastern hognose snake, Heterodon platirhinos, induced a neuromuscular blockade in the isolated frog sciatic nerve-gastrocnemius muscle preparation and effectively antagonized acetylcholine and histamine responses of the rat duodenum preparation. The Duvernoy's secretions (100-mu-g/ml) produced a reversible, excitatory effect in the guinea-pig ileum in vitro. Mice administered the secretions (100 mg/kg, i.p.) exhibited minor, transient signs of toxicity. These preliminary observations provide evidence for toxicity of H. platirhinos Duvernoy's gland secretions but do not warrant categorizing the potential toxicity of this species with that of proteroglyphous, solenoglyphous, or the more venomous opisthoglyphous species. RP YOUNG, RA (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 TC 11 Z9 11 U1 4 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0041-0101 J9 TOXICON JI Toxicon PD JUL PY 1992 VL 30 IS 7 BP 775 EP 779 DI 10.1016/0041-0101(92)90013-U PG 5 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA JD020 UT WOS:A1992JD02000013 PM 1509497 ER PT J AU SAJWAN, KS KAPLAN, DI MITTRA, BN PANDE, HK AF SAJWAN, KS KAPLAN, DI MITTRA, BN PANDE, HK TI MILLING QUALITY OF RICE AS INFLUENCED BY TIME OF HARVESTING AND STORAGE-CONDITIONS SO TROPICAL AGRICULTURE LA English DT Article DE MILLING OUT-TURN; MILL YIELD; HEAD YIELD; GRAIN FISSURES; GERMINATION; VIABILITY; GRAIN HARDNESS; STORAGE AB The performances of three rice varieties, Jaya, Pusa 2-21 and Ratna, with respect to grain and milling quality under various harvest times and storage conditions were studied. Harvesting of crops 32 days after flowering resulted in the highest head yield. The storage duration and condition did not affect the protein content of the grain. Greater grain hardness was obtained when paddy was stored in metal drums than when stored in bamboo mud-plastered bins or gunny bags. Total mill yield remained unaffected by storage duration and conditions. Head yield improved with the increase in duration of storage. A more rapid fall in seed viability in terms of germination percentage was noticed under storage in gunny bags than in the other two. C1 INDIAN INST TECHNOL,DEPT AGR ENGN,KHARAGPUR 721302,W BENGAL,INDIA. RP SAJWAN, KS (reprint author), SAVANNAH RIVER ECOL LAB,DIV BIOGEOCHEM ECOL,DRAWER E,AIKEN,SC 29801, USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU TROPICAL AGRICULTURE PI TRINIDAD PA UNIV WEST INDIES FAC OF AGRICULTURE ST AUGUSTINE, TRINIDAD, WEST INDIES SN 0041-3216 J9 TROP AGR JI Trop. Agric. PD JUL PY 1992 VL 69 IS 3 BP 296 EP 300 PG 5 WC Agriculture, Multidisciplinary; Agronomy SC Agriculture GA JA944 UT WOS:A1992JA94400023 ER PT J AU FERRELL, TL SHARP, SL WARMACK, RJ AF FERRELL, TL SHARP, SL WARMACK, RJ TI PROGRESS IN PHOTON SCANNING TUNNELING MICROSCOPY (PSTM) SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY AB Tunneling of either electrons or photons from a sample to a probe tip yields an exponential signal that permits subwavelength tangential resolution and even better resolution of the tip-to-sample distance. PSTM provides images of both insulators and conductors that are either thin or not too strongly absorbing at the wavelength used. STM provides better spatial resolution but poorer spectroscopic resolution, so there are complementary aspects for the two instruments. Our recent progress with the PSTM includes adding a zoom capability, detection of surface-enhanced Raman signals, imaging of photolithographically prepared arrays of isolated silver particles, and studies of tunneling effects on films of photoresist. RP FERRELL, TL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 408 EP 415 DI 10.1016/0304-3991(92)90300-9 PN A PG 8 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700064 ER PT J AU DUNPHY, JC OGLETREE, DF SALMERON, MB SAUTET, P BOCQUET, ML JOACHIM, C AF DUNPHY, JC OGLETREE, DF SALMERON, MB SAUTET, P BOCQUET, ML JOACHIM, C TI TIP-DEPENDENT CONTRAST IN STM IMAGING OF ADSORBED SULFUR LAYERS - THEORY AND EXPERIMENT SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY ID SCANNING TUNNELING MICROSCOPE; ENERGY ELECTRON-DIFFRACTION; CARBON-MONOXIDE; BENZENE; SURFACE; SPECTROSCOPY; COADSORPTION; RESOLUTION; ATOM AB Sulfur atoms adsorbed on the Re(0001) surface form several different ordered structures as a function of sulfur coverage. Sudden changes in the detailed appearance of atomic-resolution STM images of these structures have been observed. Theoretical image simulations using electron scattering quantum chemical (ESQC) methods show that the image structure is strongly dependent on the chemical identity of the STM tip atom. Observed changes in the sulfur images can be caused by changes from rhenium-terminated to sulfur-terminated STM tips. These results demonstrate the value of ESQC calculations for STM image interpretation. C1 ECOLE NORMALE SUPER LYON,CHIM THEOR LAB,F-69364 LYON 07,FRANCE. INST RECH CATALYSE,F-69626 VILLEURBANNE,FRANCE. CNRS,CEMES,MOLEC ELECTR GRP,F-31055 TOULOUSE,FRANCE. RP DUNPHY, JC (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI BOCQUET, MARIE-LAURE/A-7810-2011; Sautet, Philippe/G-3710-2014; Ogletree, D Frank/D-9833-2016 OI Sautet, Philippe/0000-0002-8444-3348; Ogletree, D Frank/0000-0002-8159-0182 NR 24 TC 29 Z9 29 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 490 EP 497 DI 10.1016/0304-3991(92)90312-8 PN A PG 8 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700076 ER PT J AU TENCH, RJ BALOOCH, M SIEKHAUS, WJ MCLEAN, W AF TENCH, RJ BALOOCH, M SIEKHAUS, WJ MCLEAN, W TI SCANNING-TUNNELING-MICROSCOPY-ENHANCED OXIDATION OF URANIUM DEPOSITED ON THE BASAL-PLANE OF GRAPHITE SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY ID SUPERCONDUCTING FILMS; LASER; EVAPORATION; ABLATION; CLUSTERS; UO2 AB Uranium metal was deposited onto the basal plane of graphite by pulsed excimer-laser ablation in a UHV system equipped with Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). Low deposition coverages imaged by in-situ STM show the formation of clusters of varying sizes on the surface. Thicker films (estimated to be 20-30 monolayers) were also investigated by STM in-situ and in air immediately after removal from the UHV system. Imaging in air was found to be possible for up to one hour, even though the expected oxidation rate at room temperature should lead to the complete oxidation of a uranium film to UO2 in a few minutes. Films estimated to be thicker than 50 monolayers, however, were not imageable at all, suggesting that thin films consisting of clusters exhibit reactivities that are different from bulk samples. STM-enhanced oxidation in air was observed for thin films if the tip was held at a negative potential with respect to the sample. Possible mechanisms of enhancement are discussed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP TENCH, RJ (reprint author), UNIV CALIF DAVIS LIVERMORE,LIVERMORE,CA 94550, USA. NR 8 TC 1 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 668 EP 673 DI 10.1016/0304-3991(92)90339-L PN A PG 6 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700103 ER PT J AU HAWLEY, ME RAISTRICK, ID HOULTON, RJ GARZON, FH PIZA, M AF HAWLEY, ME RAISTRICK, ID HOULTON, RJ GARZON, FH PIZA, M TI THE EFFECT OF SPUTTER DEPOSITION CONDITIONS ON GROWTH-MECHANISM AND MICROSTRUCTURE OF YBA2CU3O7-X THIN-FILMS ON NDGAO3 SUBSTRATES STUDIED BY SCANNING TUNNELING MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY ID INSITU; PRESSURE AB Thin films of YBa2CU3O7-x were deposited on a perovskite substrate, NdGaO3, by off-axis RF magnetron sputtering at it variety of different temperature, total pressure and oxygen partial pressure (pO2) growth conditions in order to study their effect on microstructure. The resulting c-axis and combined c/a-axis-normal films were characterized by scanning tunneling and atomic force microscopies, X-ray diffraction, and eddy-current measurements. Initial stages of deposition proceeded by c-axis-oriented growth on all films. At low pO2, a transition to a-axis perpendicular growth was observed. beyond a critical thickness, while at high pO2, exclusively c-axis perpendicular material was found. A transition from a spiral growth mechanism to a nucleation-dominated growth regime is discussed. RP HAWLEY, ME (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 13 Z9 13 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 705 EP 714 DI 10.1016/0304-3991(92)90346-L PN A PG 10 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700110 ER PT J AU ALLEN, MJ BALOOCH, M SUBBIAH, S TENCH, RJ BALHORN, R SIEKHAUS, W AF ALLEN, MJ BALOOCH, M SUBBIAH, S TENCH, RJ BALHORN, R SIEKHAUS, W TI ANALYSIS OF ADENINE AND THYMINE ADSORBED ON GRAPHITE BY SCANNING TUNNELING AND ATOMIC FORCE MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article AB Analysis of AFM of adenine and thymine adsorbed onto a hot graphite surface shows that these molecules are adsorbed in patches typically 50 nm wide and 5 nm high, but does not provide any discernable atomic structure. In contrast, STM image scans that contain both parts of the graphite substrate and of the adsorbate would mislead one to believe that the adsorbates consist of just one ordered monolayer of either adenine of thymine (like alkylcyanobiphenyl on graphite [D.P.E. Smith et al., Nature 344 (1990)641]). From these STM images the lattice dimensions, structural periodicities, and the epitaxy of the adsorbed molecules with respect to the basal plane of graphite can be determined. The aromatic regions are strongly detected with near-atomic resolution in both molecules, while the various sidegroups are not well resolved. Thus STM can discriminate between purines and pyrimidines - if they are held in thick patches. C1 STANFORD UNIV,MED CTR,SCH MED,BECKMAN LAB STRUCT BIOL,DEPT CELL BIOL,STANFORD,CA 94305. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550. RP ALLEN, MJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550, USA. NR 7 TC 18 Z9 18 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1049 EP 1053 DI 10.1016/0304-3991(92)90400-E PN B PG 5 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300015 ER PT J AU THUNDAT, T WARMACK, RJ ALLISON, DP FERRELL, TL AF THUNDAT, T WARMACK, RJ ALLISON, DP FERRELL, TL TI ELECTROSTATIC SPRAYING OF DNA-MOLECULES FOR INVESTIGATION BY SCANNING TUNNELING MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article ID TUNNELLING MICROSCOPY; GRAPHITE; BIOMOLECULES; SPECTROSCOPY; DEPOSITION; PROSPECTS; IMAGES; ACID AB We have investigated electrostatic spraying of DNA onto gold surfaces as an alternative sample-preparation technique for STM studies. Preliminary results show that a higher distribution of isolated strands as well as well ordered aggregates can be obtained with this technique when compared with electrodeposition or drop evaporation. In many places, the well ordered aggregates were found to cleave in a direction perpendicular to their length after repeated scanning in the same direction. C1 UNIV TENNESSEE,KNOXVILLE,TN 37994. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 24 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1083 EP 1087 DI 10.1016/0304-3991(92)90406-A PN B PG 5 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300021 PM 1413244 ER PT J AU ALLISON, DP WARMACK, RJ BOTTOMLEY, LA THUNDAT, T BROWN, GM WOYCHIK, RP SCHRICK, JJ JACOBSON, KB FERRELL, TL AF ALLISON, DP WARMACK, RJ BOTTOMLEY, LA THUNDAT, T BROWN, GM WOYCHIK, RP SCHRICK, JJ JACOBSON, KB FERRELL, TL TI SCANNING TUNNELING MICROSCOPY OF DNA - A NOVEL TECHNIQUE USING RADIOLABELED DNA TO EVALUATE CHEMICALLY MEDIATED ATTACHMENT OF DNA TO SURFACES SO ULTRAMICROSCOPY LA English DT Article ID MOLECULAR-STRUCTURE; NUCLEIC-ACIDS; IMAGES; WATER; GOLD AB pBS+ plasmid deoxyribonucleic acid (DNA) was imaged by scanning tunneling microscopy (STM) after mounting microdroplets by aerosol deposition onto heated epitaxial gold surfaces. However, the instability of the adsorbate to forces exerted by the tunneling tip points out the need for more aggressive bonding of molecules to surfaces. We describe a sensitive assay for the qualitative and quantitative evaluation of chemical agents to influence binding of DNA to surfaces using P-32-labeled pBS+ plasmid DNA. We propose that such an assay can make an important contribution to immobilization techniques prior to STM imaging. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37830. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37830. UNIV TENNESSEE,GRAD SCH BIOMED SCI,KNOXVILLE,TN 37996. RP ALLISON, DP (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37830, USA. OI Bottomley, Lawrence/0000-0002-2325-9862 NR 18 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1088 EP 1094 DI 10.1016/0304-3991(92)90407-B PN B PG 7 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300022 PM 1413245 ER PT J AU ALLEN, MJ HUD, NV BALOOCH, M TENCH, RJ SIEKHAUS, WJ BALHORN, R AF ALLEN, MJ HUD, NV BALOOCH, M TENCH, RJ SIEKHAUS, WJ BALHORN, R TI TIP-RADIUS-INDUCED ARTIFACTS IN AFM IMAGES OF PROTAMINE-COMPLEXED DNA FIBERS SO ULTRAMICROSCOPY LA English DT Article ID ATOMIC FORCE MICROSCOPE AB Isolated DNA fibers complexed with protamine (the chromosomal protein that packages DNA in mammalian sperm) have been produced by partially decondensing the highly compacted mouse sperm chromatin particle on a glass coverslip. These DNA fibers were then scanned with the atomic force microscope (AFM). While the smallest of the fibers appear in AFM images as ribbon-like structures 250-350 angstrom wide and 10-25 angstrom high, experiments indicate that these images are the result of a convolution of the imaging-tip's shape with the object's actual shape. In such convolutions the height of the object is affected only by the compressibility of the object, while the width is affected in addition by the sharpness of the tip. Images of polyamidoamine particles also appear to show this artifact. We have also deduced the tip's radius of curvature from images of sharp steps and attempt to demonstrate the artifacts associated with a relatively large imaging tip. C1 LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP ALLEN, MJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550, USA. NR 8 TC 88 Z9 88 U1 2 U2 24 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1095 EP 1100 DI 10.1016/0304-3991(92)90408-C PN B PG 6 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300023 PM 1413246 ER PT J AU THUNDAT, T ALLISON, DP WARMACK, RJ FERRELL, TL AF THUNDAT, T ALLISON, DP WARMACK, RJ FERRELL, TL TI IMAGING ISOLATED STRANDS OF DNA-MOLECULES BY ATOMIC FORCE MICROSCOPY SO ULTRAMICROSCOPY LA English DT Article ID SCANNING TUNNELING MICROSCOPY; LANGMUIR-BLODGETT-FILMS; DEOXYRIBONUCLEIC-ACID; AQUEOUS ENVIRONMENT; DOUBLE HELIX; GRAPHITE; IMAGES; SURFACE; DEFORMATION; WATER AB We have employed an atomic force microscope (AFM) to image in air isolated strands of pBS+ plasmid DNA adsorbed onto freshly cleaved mica. At a DNA concentration below 0.3-mu-g/ml isolated strands of the plasmid DNA are usually seen, while for concentrations higher than 3-mu-g/ml a uniform coverage of interconnected DNA strands was observed. We found that the contrast and the width of DNA were dependent upon humidity. When the relative humidity exceeds 60%, negative contrast images with strand widths 20 times the width of DNA are found, while positive contrast images with 7 to 10 times the width of DNA are found when the humidity is below 30%. By placing the AFM in an environment where the humidity could be controlled, we were able to switch between positive and negative contrasts. C1 UNIV TENNESSEE,KNOXVILLE,TN 37994. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 30 TC 70 Z9 70 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1101 EP 1106 DI 10.1016/0304-3991(92)90409-D PN B PG 6 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300024 PM 1413247 ER PT J AU KOLBE, WF OGLETREE, DF SALMERON, MB AF KOLBE, WF OGLETREE, DF SALMERON, MB TI ATOMIC FORCE MICROSCOPY IMAGING OF T4 BACTERIOPHAGES ON SILICON SUBSTRATES SO ULTRAMICROSCOPY LA English DT Article ID SCANNING TUNNELING MICROSCOPY; SURFACES AB A new atomic force microscope incorporating microfabricated cantilevers and employing laser beam deflection for force detection has been constructed and is being applied to studies of biological material. In this study, T4 bacteriophage virus particles were deposited from solution onto electronic-grade flat silicon wafers and imaged in air with the microscope. Microliter droplets of the solution were deposited and either allowed to dry or removed with blotting paper. The images show both isolated viruses and aggregates of various sizes. The external structure as well as strands believed to be DNA streaming out of the virus could be observed. The construction of the microscope and its performance are also described. RP KOLBE, WF (reprint author), LAWRENCE BERKELEY LAB,DIV ENGN & MAT SCI,BERKELEY,CA 94720, USA. RI Ogletree, D Frank/D-9833-2016 OI Ogletree, D Frank/0000-0002-8159-0182 NR 17 TC 63 Z9 63 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1113 EP 1117 DI 10.1016/0304-3991(92)90411-C PN B PG 5 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300026 PM 1413249 ER PT J AU CARR, R THOMSON, RE AF CARR, R THOMSON, RE TI DEVICE FOR HIGH-RESOLUTION POSITIONING SO ULTRAMICROSCOPY LA English DT Article AB This paper is a description of a high resolution actuator consisting of a smooth round shaft and a mechanism which translates when the shaft is rotated. The motion is monotonic and controllable to less than 900 Angstroms per degree of rotation. The mechanism is rigid, stable, and offers an unlimited range; it is vacuum compatible, and ideally suited to the approach function for a scanning tunneling microscope. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CARR, R (reprint author), STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309, USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1606 EP 1609 DI 10.1016/0304-3991(92)90492-3 PN B PG 4 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300107 ER PT J AU SHANNON, JD SISTERSON, DL AF SHANNON, JD SISTERSON, DL TI ESTIMATION OF S-N AND NOX-N DEPOSITION BUDGETS FOR THE UNITED-STATES AND CANADA SO WATER AIR AND SOIL POLLUTION LA English DT Article AB Extensive wet deposition monitoring data, along with much sparser dry deposition monitoring data and isolated field characterizations of droplet deposition, are used to produce an annual deposition budget for S and NO(X)-N for each contiguous U.S. state and Canadian province. The contribution to wet deposition from natural sources is estimated, and wet deposition is adjusted accordingly, to focus the analysis on deposition associated with anthropogenic emissions. The budgets, which are appropriate for 1985-1987, include adjustments for increased local wet and dry deposition near point sources and urban areas, which are generally avoided in selecting monitoring sites. When aggregated over the United States and Canada, estimated wet, dry, and droplet deposition account for about 30, 29, and 4% of anthropogenic S emissions, respectively, implying that 37% is exported. For NO(X)-N, estimated wet, dry, and droplet deposition account for 30, 43, and 4% of anthropogenic emissions, with 23% exported. Results are in general agreement with a variety of other observational analyses and regional modeling simulations, particularly for eastern North America, and are consistent with estimates of net horizontal mass fluxes of S and NO(X)-N across the Atlantic coast of North America. RP SHANNON, JD (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 29 TC 18 Z9 18 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD JUL PY 1992 VL 63 IS 3-4 BP 211 EP 235 DI 10.1007/BF00475491 PG 25 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA HY921 UT WOS:A1992HY92100001 ER PT J AU HWANG, Y PIGFORD, TH CHAMBRE, PL LEE, WWL AF HWANG, Y PIGFORD, TH CHAMBRE, PL LEE, WWL TI ANALYSES OF MASS-TRANSPORT IN A NUCLEAR WASTE REPOSITORY IN SALT SO WATER RESOURCES RESEARCH LA English DT Article ID POROUS ROCK AB Salt is the proposed host rock for geologic repositories of nuclear waste in several nations because it is "dry" and probably "impermeable." To evaluate the safety of nuclear waste disposal in salt, it is necessary to calculate the rate of release of nuclides from solidified waste form and to predict the transport of released radionuclides. Our objective is to develop analytic methods for such prediction, based on mass transfer theory. First, we present an analysis of pressure-driven brine migration. After consolidation, brine migration analyzed by these equations and using the particular set of parameter values is of a small magnitude, with Darcy velocities of the order of micrometers per year. Brine migration in consolidated salt is very localized, within a few meters from the waste package, and highly transient. We have analyzed diffusion of radionuclides near waste packages in a salt repository, using analytic equations for low Peclet systems. According to this analysis it is unlikely that any low-solubility species will have difficulty meeting the U.S. Nuclear Regulatory Commission release rate requirement at the bare waste/salt interface. We have also analyzed the role that an interbed might play in being a preferential pathway for radionuclide migration. We calculate the diffusive mass fluxes from an infinitely long bare waste cylinder in salt, facing an interbed. The fractional release rates of solubility-limited species into the interbed are low for the parameter values used in the numerical illustrations. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. NR 16 TC 4 Z9 4 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUL PY 1992 VL 28 IS 7 BP 1857 EP 1868 DI 10.1029/92WR00470 PG 12 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA JC483 UT WOS:A1992JC48300011 ER PT J AU MAGUIRE, MC EDWARDS, GR DAVID, SA AF MAGUIRE, MC EDWARDS, GR DAVID, SA TI WELDABILITY AND HOT DUCTILITY OF CHROMIUM-MODIFIED NI3AL ALLOYS SO WELDING JOURNAL LA English DT Article DE WELDABILITY; HOT DUCTILITY; CR-MODIFIED ALLOYS; NI3AL ALLOYS; CHROMIUM ADDITIONS; MICROSTRUCTURE; PRIOR HEAT TREATMENT; OIL-QUENCHED ALLOYS; FURNACE-COOLED; SEM FRACTOGRAPHY ID AFFECTED ZONE CRACKING; BORON-DOPED NI3AL; MECHANICAL-PROPERTIES; FRACTURE-BEHAVIOR; 600-DEGREES-C AB Hot ductility and weldability of four chromium-modified Ni3Al alloys were characterized. The chromium content in the alloys varied from 2 to 8 at.-%, and two heat treatments were used to change the ordered microstructure: an anneal at 1190-degrees-C (2174-degrees-F) with a furnace cool, or an anneal at 1240-degrees-C (2264-degrees-F) or 1270-degrees-C (2318-degrees-F) followed by an oil quench. Different annealing temperatures and variation in cooling rates produced significantly different microstructures in the alloys. Oil quenching produced fine antiphase domains (APD) in the higher-chromium alloys; whereas, no such substructure was prevalent in slowly cooled microstructures of the same alloy. Hot ductility tests conducted on heating showed that higher chromium alloys were more ductile in the oil-quenched condition. For example, at 600-degrees-C (1274-degrees-F) an 8 at.-% chromium alloy in the oil-quenched condition exhibited 16% reduction in area; whereas, in the furnace-cooled condition, ductility fell to 9%. Chromium additions also increased the flow and fracture stress. The fracture stress increased from 700 MPa (102 ksi) in a 2 at.-% chromium alloy to 1200 MPa (174 ksi) in an 8 at.-% alloy. These results correlated well with cracking response during autogenous electron beam (EB) welding. Full penetration EB welds were made at speeds of 2.1 to 25.4 mm/s (5 to 60 in./min). on each alloy. HAZ cracking tendency decreased with higher chromium additions, and it was completely eliminated in the 8 at.-% chromium alloy. The improved hot ductility and decreased cracking tendency in the chromium-rich alloys were related to their increased strength, and the presence of a fine antiphase domain microstructure. C1 CTR WELDING & JOINING RES,DEPT MET & MAT ENGN,GOLDEN,CO. OAK RIDGE NATL LAB,MAT JOINING GRP,OAK RIDGE,TN 37831. RP MAGUIRE, MC (reprint author), SANDIA NATL LABS,DIV PROC MET,ALBUQUERQUE,NM 87185, USA. NR 26 TC 2 Z9 2 U1 0 U2 3 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUL PY 1992 VL 71 IS 7 BP S231 EP S242 PG 12 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA JC092 UT WOS:A1992JC09200012 ER PT J AU WEBER, M DONZAUD, C DUFOUR, JP GEISSEL, H GREWE, A GUILLEMAUDMUELLER, D KELLER, H LEWITOWICZ, M MAGEL, A MUELLER, AC MUNZENBERG, G NICKEL, F PFUTZNER, M PIECHACZEK, A PRAVIKOFF, M ROECKL, E RYKACZEWSKI, K SAINTLAURENT, MG SCHALL, I STEPHAN, C SUMMERER, K TASSANGOT, L VIEIRA, DJ VOSS, B AF WEBER, M DONZAUD, C DUFOUR, JP GEISSEL, H GREWE, A GUILLEMAUDMUELLER, D KELLER, H LEWITOWICZ, M MAGEL, A MUELLER, AC MUNZENBERG, G NICKEL, F PFUTZNER, M PIECHACZEK, A PRAVIKOFF, M ROECKL, E RYKACZEWSKI, K SAINTLAURENT, MG SCHALL, I STEPHAN, C SUMMERER, K TASSANGOT, L VIEIRA, DJ VOSS, B TI NEW NEUTRON-RICH ISOTOPES IN THE SCANDIUM-TO-NICKEL REGION, PRODUCED BY FRAGMENTATION OF A 500 MEV/U KR-86 BEAM SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Article AB We have measured production cross-sections of the new neutron-rich isotopes 58Ti, 63Cr, 66Mn, 69Fe, 71Co and neighbouring isotopes that have been identified as projectile fragments from reactions between a 500 MeV/u Kr-83 beam and a beryllium target. The isotope identification was performed with thc zero-degree magnetic spectrometer FRS at GSI, using in addition time-of-flight and energy-loss measurements. The experimental production cross-sections for the new nuclides and neighbouring isotopes are compared with an empirical parametrization. The resulting prospects for reaching even more neutron-rich isotopes, such as the doubly-magic nuclide 78Ni, are discussed. C1 CEN,F-33175 GRADIGNAN,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. GRAND ACCELERATOR NATL IONS LOURDES,F-14021 CAEN,FRANCE. INST PHYS NUCL,F-91406 ORSAY,FRANCE. TH DARMSTADT,INST KERNPHYS,W-6100 DARMSTADT,GERMANY. RP WEBER, M (reprint author), GESELL SCHWERIONENFORSCH GMBH,POSTFACH 110552,W-6100 DARMSTADT,GERMANY. NR 19 TC 35 Z9 35 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD JUL PY 1992 VL 343 IS 1 BP 67 EP 71 DI 10.1007/BF01291599 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE663 UT WOS:A1992JE66300011 ER PT J AU LESIAK, T ANTREASYAN, D BARTELS, HW BESSET, D BIELER, C BIENLEIN, JK BIZZETI, A BLOOM, ED BROCK, I BROCKMULLER, K CABENDA, R CARTACCI, A CAVALLISFORZA, M CLARE, R COMPAGNUCCI, A CONFORTO, G COOPER, S COWAN, R COYNE, D ENGLER, A FAIRFIELD, K FOLGER, G FRIDMAN, A GAISER, J GELPHMAN, D GLASER, G GODFREY, G GRAAF, K HEIMLICH, FH HEINSIUS, FH HOFSTADTER, R IRION, J JAKUBOWSKI, Z JANSSEN, H KARCH, K KEH, S KIEL, T KILIAN, H KIRKBRIDE, I KLOIBER, T KOBEL, M KOCH, W KONIG, AC KONIGSMANN, K KRAEMER, RW KRUGER, S LANDI, G LEE, R LEFFLER, S LEKEBUSCH, R LITKE, AM LOCKMAN, W LOWE, S LURZ, B MARLOW, D MARSISKE, H MASCHMANN, W MCBRIDE, P MESSING, F METZGER, WJ MEYER, H MONTELEONI, B MURYN, B NERNST, R NICZYPORUK, B NOWAK, G PECK, C PELFER, PG POLLOCK, B PORTER, FC PRINDLE, D RATOFF, P REIDENBACH, M RENGER, B RIPPICH, C SCHEER, M SCHMITT, P SCHOTANUS, J SCHUTTE, J SCHWARZ, A SIEVERS, D SKWARNICKI, T STOCK, V STRAUCH, K STROHBUSCH, U TOMPKINS, J TROST, HJ VANUITERT, B VANDEWALLE, RT VOGEL, H VOIGT, A VOLLAND, U WACHS, K WACKER, K WALK, W WEGENER, H WILLIAMS, DA ZSCHORSCH, P AF LESIAK, T ANTREASYAN, D BARTELS, HW BESSET, D BIELER, C BIENLEIN, JK BIZZETI, A BLOOM, ED BROCK, I BROCKMULLER, K CABENDA, R CARTACCI, A CAVALLISFORZA, M CLARE, R COMPAGNUCCI, A CONFORTO, G COOPER, S COWAN, R COYNE, D ENGLER, A FAIRFIELD, K FOLGER, G FRIDMAN, A GAISER, J GELPHMAN, D GLASER, G GODFREY, G GRAAF, K HEIMLICH, FH HEINSIUS, FH HOFSTADTER, R IRION, J JAKUBOWSKI, Z JANSSEN, H KARCH, K KEH, S KIEL, T KILIAN, H KIRKBRIDE, I KLOIBER, T KOBEL, M KOCH, W KONIG, AC KONIGSMANN, K KRAEMER, RW KRUGER, S LANDI, G LEE, R LEFFLER, S LEKEBUSCH, R LITKE, AM LOCKMAN, W LOWE, S LURZ, B MARLOW, D MARSISKE, H MASCHMANN, W MCBRIDE, P MESSING, F METZGER, WJ MEYER, H MONTELEONI, B MURYN, B NERNST, R NICZYPORUK, B NOWAK, G PECK, C PELFER, PG POLLOCK, B PORTER, FC PRINDLE, D RATOFF, P REIDENBACH, M RENGER, B RIPPICH, C SCHEER, M SCHMITT, P SCHOTANUS, J SCHUTTE, J SCHWARZ, A SIEVERS, D SKWARNICKI, T STOCK, V STRAUCH, K STROHBUSCH, U TOMPKINS, J TROST, HJ VANUITERT, B VANDEWALLE, RT VOGEL, H VOIGT, A VOLLAND, U WACHS, K WACKER, K WALK, W WEGENER, H WILLIAMS, DA ZSCHORSCH, P TI SEARCH FOR RADIATIVE B-MESON DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID EXCLUSIVE DECAYS; B->S-GAMMA; PHYSICS; QUARK AB The Crystal Ball detector at the e+ e- storage ring DORIS-II has been used to search for radiative B meson decays, especially of the type b --> s-gamma. No monoenergetic gamma-lines have been found in the inclusive photon spectrum from UPSILON(4S) decays, and upper limits are obtained for radiative decays of B mesons to various strange mesons and to the D*. Integrating the photon spectrum over the corresponding energy range, we find BR (B--> gamma-X) < 2.8 x 10(-3), at 90% confidence level for the mass range 892 MeV less-than-or-equal-to M(X) less-than-or-equal-to 2045 MeV. C1 NATL INST NUCL PHYS & HIGH ENERGY PHYS,6525 ED NIJMEGEN,NETHERLANDS. IST NAZL FIS NUCL,I-50125 FLORENCE,ITALY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CALTECH,PASADENA,CA 91125. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV FLORENCE,I-50125 FLORENCE,ITALY. UNIV HAMBURG,INST EXPTL PHYS 1,W-2000 HAMBURG 13,GERMANY. HARVARD UNIV,CAMBRIDGE,MA 02138. CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS. STANFORD UNIV,HEPL,DEPT PHYS,STANFORD,CA 94305. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV WURZBURG,W-8700 WURZBURG,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. DESY,W-2000 HAMBURG,GERMANY. UNIV ERLANGEN NURNBERG,W-8520 ERLANGEN,GERMANY. RP LESIAK, T (reprint author), CRACOW INST NUCL PHYS,PL-30055 KRAKOW,POLAND. RI Marlow, Daniel/C-9132-2014; Cavalli-Sforza, Matteo/H-7102-2015; Vogel, Helmut/N-8882-2014 OI Vogel, Helmut/0000-0002-6109-3023 NR 32 TC 2 Z9 2 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1992 VL 55 IS 1 BP 33 EP 38 PG 6 WC Physics, Particles & Fields SC Physics GA JE659 UT WOS:A1992JE65900003 ER PT J AU ADEVA, B ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BRUYANT, F BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALES, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMMER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A AF ADEVA, B ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BRUYANT, F BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALES, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMMER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A TI STUDIES OF HADRONIC EVENT STRUCTURE AND COMPARISONS WITH QCD MODELS AT THE Z(0) RESONANCE SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID MONTE-CARLO SIMULATION; ELECTRON-POSITRON ANNIHILATION; SOFT GLUON INTERFERENCE; JET PRODUCTION-RATES; E+E-ANNIHILATION; Z0 RESONANCE; PERTURBATIVE QCD; CHARGED-PARTICLE; MULTIPLICITY DISTRIBUTIONS; QUANTUM CHROMODYNAMICS AB The structure of hadronic events from Z0 decay is studied by measuring event shape variables, factorial moments, and the energy flow distribution. The distributions, after Correction for detector effects and initial and final state radiation, are compared with the predictions of different QCD Monte Carlo programs with optimized parameter values. These Monte Carlo programs use either the second order matrix element or the parton shower evolution for the perturbative QCD calculations and use the string, the cluster, or the independent fragmentation model for hadronization. Both parton shower and O(alpha(s)2) matrix element based models with string fragmentation describe the data well. The predictions of the model based on parton shower and cluster fragmentation are also in good agreement with the data. The model with independent fragmentation gives a poor description of the energy flow distribution. The predicted energy evolutions for the mean values of thrust, sphericity, aplanarity, and charge multiplicity are compared with the data measured at different center-of-mass energies. The parton shower based models with string or cluster fragmentation are found to describe the energy dependences well while the model based on the O(alpha(s)2) calculation falls to reproduce the energy dependences of these mean values. C1 RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. CTR INVEST ENERGET MEDIOAMBIENTALES TECNOL, E-28040 MADRID, SPAIN. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. UNIV LYON 1, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. LAB ANNECY LE VIEUX PHYS PARTICULES, F-74519 ANNECY LE VIEUX, FRANCE. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. BOSTON UNIV, BOSTON, MA 02215 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV FLORENCE, I-50125 FLORENCE, ITALY. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. NAPLES UNIV, I-80125 NAPLES, ITALY. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUC PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. NATL INST NUCL PHYS, ROME, ITALY. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. RP ADEVA, B (reprint author), CERN, CH-1211 GENEVA 23, SWITZERLAND. RI Fiandrini, Emanuele/C-4549-2008; bertucci, bruna/J-5237-2012; Leijtens, Xaveer/F-3302-2010; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; Adeva, Bernardo /L-1378-2014; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; Tsaregorodtsev, Andrei/E-3873-2016; Ferguson, Thomas/O-3444-2014; Vogel, Helmut/N-8882-2014; OI Leijtens, Xaveer/0000-0001-7794-8236; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Adeva, Bernardo /0000-0001-9756-3712; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Ferguson, Thomas/0000-0001-5822-3731; Diemoz, Marcella/0000-0002-3810-8530; Vogel, Helmut/0000-0002-6109-3023; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247 NR 114 TC 119 Z9 119 U1 1 U2 8 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 JUL PY 1992 VL 55 IS 1 BP 39 EP 61 PG 23 WC Physics, Particles & Fields SC Physics GA JE659 UT WOS:A1992JE65900004 ER PT J AU GINTER, DM WENT, GT BELL, AT RADKE, CJ AF GINTER, DM WENT, GT BELL, AT RADKE, CJ TI A PHYSICOCHEMICAL STUDY OF THE AGING OF COLLOIDAL SILICA-GELS USED IN ZEOLITE-Y SYNTHESIS SO ZEOLITES LA English DT Article DE COLLOIDAL SILICA; GELATION AND DISSOLUTION; ALUMINOSILICATE GEL AGING; LIQUID-LINE AND GEL MAS NMR SPECTROSCOPIES; NAY NUCLEATION ID NMR-SPECTROSCOPY; ALUMINOSILICATE; SI-29 AB An investigation was carried out to determine the effects of room-temperature aging on the structure and composition of NaY zeolite synthesis gels prepared from colloidal silica. Alkaline solutions containing varying amounts of sodium aluminate were added to a colloidal silica sol to produce gels of composition 4 Na2O, x Al2O3, 10 SiO2, 180 H2O (x = 0.0 - 1.5). Each of the gels was homogenized and then allowed to age at room temperature. Changes in the composition and structure of the solid and liquid phases of zeolite synthesis gels were followed as a function of time using elemental analysis; n.m.r., i.r. and Raman spectroscopies; and X-ray diffraction. Initial mixing of the colloidal silica, caustic, and aluminate has no noticeable chemical or structural effects beyond gelation via flocculation of the silica particles and adsorption of Al and Na onto the surface of the particles. The colloidal silica dissolves during aging as a consequence of successive cleavage of siloxane bonds. Adsorption of Al reduces the rate of silica dissolution. The slow dissolution of the silica releases monomeric silicate anions that rapidly react with aluminate anions to form an aluminosilicate precipitate, estimated to have a Si/Al ratio of 1. Once the dissolved aluminum is depleted from the liquid phase, the remaining colloidal silica dissolves away, leaving only an amorphous aluminosilicate in the solid phase, which can then rearrange through interaction with the silicates anions in solution. As discussed in a companion study, the aluminosilicate precipitate formed during aging serves as the precursor for nuclei which induce the cyrstallization of NaY zeolite. C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 38 TC 55 Z9 56 U1 4 U2 41 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0144-2449 J9 ZEOLITES JI Zeolites PD JUL-AUG PY 1992 VL 12 IS 6 BP 733 EP 741 DI 10.1016/0144-2449(92)90125-9 PG 9 WC Chemistry, Physical SC Chemistry GA JF022 UT WOS:A1992JF02200015 ER PT J AU GINTER, DM BELL, AT RADKE, CJ AF GINTER, DM BELL, AT RADKE, CJ TI THE EFFECTS OF GEL AGING ON THE SYNTHESIS OF NAY ZEOLITE FROM COLLOIDAL SILICA SO ZEOLITES LA English DT Article DE COLLOIDAL SILICA; NAY CRYSTALLIZATION; GEL AGING; NUCLEATION ID CRYSTALLIZATION AB We have investigated the effects of gel aging on the synthesis of NaY zeolite. Gels were prepared by adding a sodium aluminate solution to a colloidal silica sol. After aging at room temperature for fixed periods of time, the gels were heated to 100-degrees-C. The kinetics of crystallization were followed by powder X-ray diffraction. Compositional and structural information was provided by elemental chemical analysis; n.m.r., i.r., and Raman spectroscopies; and scanning electron microscopy. The rate of crystallization and the composition of the crystalline products depend strongly on the quantity and composition of an amorphous aluminosilicate solid produced during aging. Initial aging produces an Al-rich aluminosilicate solid that readily reacts to form NaY nuclei upon heating. The number of nuclei is directly related to the amount of aluminosilicate precipitated. Prolonged aging leads to incorporation of additional Si into the aluminosilicate solid. This gives rise to a larger number of smaller nuclei and results in a higher final yield of NaY. C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 22 TC 49 Z9 52 U1 2 U2 21 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0144-2449 J9 ZEOLITES JI Zeolites PD JUL-AUG PY 1992 VL 12 IS 6 BP 742 EP 749 DI 10.1016/0144-2449(92)90126-A PG 8 WC Chemistry, Physical SC Chemistry GA JF022 UT WOS:A1992JF02200016 ER PT J AU SASTRY, SS SPIELMANN, HP DWYER, TJ WEMMER, DE HEARST, JE AF SASTRY, SS SPIELMANN, HP DWYER, TJ WEMMER, DE HEARST, JE TI RECENT ADVANCES IN THE SYNTHESIS AND STRUCTURE DETERMINATION OF SITE SPECIFICALLY PSORALEN-MODIFIED DNA OLIGONUCLEOTIDES SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY LA English DT Article DE LASERS; PSORALEN; PHOTOCHEMISTRY; DNA PHOTOADDUCTS; HIGH PERFORMANCE LIQUID CHROMATOGRAPHY; NUCLEAR MAGNETIC RESONANCE ID T7 RNA-POLYMERASE; INTRODUCE APPRECIABLE BENDS; CROSS-LINKS; WAVELENGTH DEPENDENCE; ELONGATION COMPLEXES; PHOTOCHEMISTRY; PHOTOREACTIONS; PHOTOREVERSAL; MONOADDUCTS; TEMPLATE AB We have developed novel methods for the preparation of multimicromole quantities of extremely pure, uniquely photoadducted psoralen-DNA cross-links, furan-side monoadducts and pyrone-side monoadducts. Psoralen cross-linked and furan-side monoadducted DNA were produced by employing high intensity argon ion and krypton ion lasers as light sources. Pyrone-side monoadducts were prepared by base-catalyzed photoreversal of psoralen crosslinks. The various psoralen-adducted DNA oligomers were efficiently purified by high performance liquid chromatography. These methods have permitted us to synthesize 4-mu-mol each of a self-complementary 8-mer d(GCGTACGC) 4'-(hydroxymethyl)-4,5',8-trimethylpsoralen (HMT) furan-side monoadduct and HMT cross-link. Preliminary nuclear magnetic resonance (NMR) data on the HMT cross-linked 8-mer d(GCGTACGC) have been obtained which confirmed the presence of the diadducted psoralen at the unique 5'TpA3' site. NMR data: obtained from the 8-mer furan-side monoadduct revealed that the psoralen molecule is intercalated into the DNA double belix. Preliminary crystals of 8-mer cross-linked DNA molecule have been grown. Conditions for the growth of X-ray diffraction-quality crystals and the further analysis of these crystals are now in progress. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM 41911]; PHS HHS [07075-11] NR 28 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1011-1344 J9 J PHOTOCH PHOTOBIO B JI J. Photochem. Photobiol. B-Biol. PD JUN 30 PY 1992 VL 14 IS 1-2 BP 65 EP 79 DI 10.1016/1011-1344(92)85083-7 PG 15 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JH316 UT WOS:A1992JH31600005 PM 1432385 ER PT J AU SELA, I BOLOGNESI, CR SAMOSKA, LA KROEMER, H AF SELA, I BOLOGNESI, CR SAMOSKA, LA KROEMER, H TI STUDY OF INTERFACE COMPOSITION AND QUALITY IN ALSB/INAS/ALSB QUANTUM-WELLS BY RAMAN-SCATTERING FROM INTERFACE MODES SO APPLIED PHYSICS LETTERS LA English DT Article ID INAS/GASB SUPERLATTICES; PHONONS AB We have studied the interface structure and the quality of molecular-beam-epitaxy grown AlSb/InAs/AlSb quantum wells through Raman scattering from interface vibrational modes from single quantum wells. A series of samples was grown by varying the growth temperature and the interface composition (by forcing either a light AlAs or a heavy InSb interface bond configuration at each InAs/AlSb interface). We have observed the InSb modes for all the samples and related the intensity and shape of the interface modes to the structure and quality of the interfaces. This work demonstrates that a single interface heterostructure can be probed by Raman scattering. C1 UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT ENGN MAT,SANTA BARBARA,CA 93106. RP SELA, I (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 38 Z9 38 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 29 PY 1992 VL 60 IS 26 BP 3283 EP 3285 DI 10.1063/1.106720 PG 3 WC Physics, Applied SC Physics GA JA806 UT WOS:A1992JA80600028 ER PT J AU COESTER, F AF COESTER, F TI FEW BODY-XIII CONFERENCE SUMMARY - IMPRESSIONS OF A SPECTATOR SO NUCLEAR PHYSICS A LA English DT Article ID SCATTERING RP COESTER, F (reprint author), ARGONNE NATL LAB, DIV PHYS, ARGONNE, IL 60439 USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 29 PY 1992 VL 543 IS 1-2 BP C427 EP C434 PG 8 WC Physics, Nuclear SC Physics GA JD763 UT WOS:A1992JD76300030 ER PT J AU GIBSON, BF AF GIBSON, BF TI THE TRINUCLEONS - PHYSICAL OBSERVABLES AND MODEL PROPERTIES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FEW BODY PROBLEMS IN PHYSICS ( FEW BODY 13 ) CY JAN 05-11, 1992 CL ADELAIDE, AUSTRALIA SP INT UNION PURE & APPL PHYS, AUSTR ACAD SCI, AUSTR DEPT IND TECHNOL & COMMERCE, AUSTR INST PHYS, FLINDERS UNIV S AUSTR ID TRITON GROUND-STATE; ASYMPTOTIC NORMALIZATION CONSTANTS; ELECTROMAGNETIC FORM-FACTORS; SPACE FADDEEV CALCULATIONS; CHARGE-SYMMETRY-BREAKING; PD ELASTIC-SCATTERING; PHASE-SHIFT ANALYSIS; DEUTERON SCATTERING; BINDING-ENERGY; SEPARABLE EXPANSION AB Our progress in understanding the properties of H-3 and He-3 in terms of a nonrelativistic Hamiltonian picture employing realistic nuclear forces is reviewed. Trinucleon model properties are summarized for a number of contemporary force models, and predictions for physical observables are presented. Disagreement between theoretical model results and experimental results are highlighted. RP GIBSON, BF (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 75 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 29 PY 1992 VL 543 IS 1-2 BP C1 EP C16 PG 16 WC Physics, Nuclear SC Physics GA JD763 UT WOS:A1992JD76300001 ER PT J AU WIRINGA, RB AF WIRINGA, RB TI MONTE-CARLO CALCULATIONS OF FEW-BODY AND LIGHT-NUCLEI SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FEW BODY PROBLEMS IN PHYSICS ( FEW BODY 13 ) CY JAN 05-11, 1992 CL ADELAIDE, AUSTRALIA SP INT UNION PURE & APPL PHYS, AUSTR ACAD SCI, AUSTR DEPT IND TECHNOL & COMMERCE, AUSTR INST PHYS, FLINDERS UNIV S AUSTR ID FORM-FACTORS; MATTER; ENERGY; 3-BODY; 4-BODY; STATE; O-16 AB A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent dime-nucleon potentials and two-body electroweak current operators, variational Monte Carlo methods are used to calculate nuclear ground-state properties, such as the binding energy, electromagnetic form factors, and momentum distributions. Other properties such as excited states and low-energy reactions are also calculable with these methods. RP WIRINGA, RB (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Wiringa, Robert/M-4970-2015 NR 31 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 29 PY 1992 VL 543 IS 1-2 BP C199 EP C212 PG 14 WC Physics, Nuclear SC Physics GA JD763 UT WOS:A1992JD76300013 ER PT J AU BURROWS, A GANDHI, R TURNER, MS AF BURROWS, A GANDHI, R TURNER, MS TI MASSIVE DIRAC NEUTRINOS AND SN-1987A SO PHYSICAL REVIEW LETTERS LA English DT Article ID BETA-SPECTRUM; SUPERNOVA 1987A; 17-KEV NEUTRINO; SN1987A; MASSES; AXIONS; BURST; S-35 AB The wrong-helicity states of a Dirac neutrino can provide an important cooling mechanism for young neutron stars. Based on numerical models of the early cooling of the neutron star associated with SN 1987A which self-consistently incorporate wrong-helicity neutrino emission, we argue that a Dirac neutrino of mass greater than 30 keV (25 keV if it is degenerate) leads to shortening of the neutrino burst that is inconsistent with the Irvine-Michigan-Brookhaven and Kamiokande II data. If pions are as abundant as nucleons in the cores of neutron stars, our limit improves to 15 keV. C1 FERMI NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. RP BURROWS, A (reprint author), UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721, USA. NR 32 TC 35 Z9 35 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 29 PY 1992 VL 68 IS 26 BP 3834 EP 3837 DI 10.1103/PhysRevLett.68.3834 PG 4 WC Physics, Multidisciplinary SC Physics GA JA760 UT WOS:A1992JA76000004 ER PT J AU BOSTED, PE ANDIVAHIS, L LUNG, A STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH AF BOSTED, PE ANDIVAHIS, L LUNG, A STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH TI MEASUREMENTS OF THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE PROTON FROM Q(2)=1.75 TO 8.83 (GEV/C)(2) SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE-MOMENTUM-TRANSFER; EXCLUSIVE PROCESSES; QUANTUM CHROMODYNAMICS; SCALING LAWS; SCATTERING; NUCLEON AB The proton elastic electric and magnetic form factors, G(Ep)(Q2) and G(Mp)(Q2), have been separately measured in the range Q2=1.75 to 8.83 (GeV/c)2, More than doubling the Q2 range of previous data. Scaled by the dipole fit, G(D)(Q2), the results for G(Mp)(Q2)/mu(p)G(D)(Q2) decrease smoothly from 1.05 to 0.91, while G(Ep)(Q2)/G(D)(Q2) is consistent with unity. Comparisons are made to QCD sum rule, di-quark, constituent quark, and vector meson dominance models, none of which agree with all of the new data. The ratio Q2F2/F1 approaches a constant value for Q2 > 3 (GeV/c)2. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV MARYLAND,COLLEGE PK,MD 20742. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. UNIV MASSACHUSETTS,AMHERST,MA 01003. STANFORD UNIV,STANFORD,CA 94305. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV PENN,PHILADELPHIA,PA 19104. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. UNIV WASHINGTON,SEATTLE,WA 98195. RP BOSTED, PE (reprint author), AMERICAN UNIV,WASHINGTON,DC 20016, USA. NR 24 TC 70 Z9 70 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 29 PY 1992 VL 68 IS 26 BP 3841 EP 3844 DI 10.1103/PhysRevLett.68.3841 PG 4 WC Physics, Multidisciplinary SC Physics GA JA760 UT WOS:A1992JA76000006 ER PT J AU XU, Y KRANE, KS GUMMIN, MA JARRIO, M WOOD, JL ZGANJAR, EF CARTER, HK AF XU, Y KRANE, KS GUMMIN, MA JARRIO, M WOOD, JL ZGANJAR, EF CARTER, HK TI SHAPE COEXISTENCE AND ELECTRIC MONOPOLE TRANSITIONS IN PT-184 SO PHYSICAL REVIEW LETTERS LA English DT Article ID EVEN-EVEN; ISOTOPES; NUCLEI AB Levels in 184Pt were studied from the decay of mass-separated 184Au by gamma-ray and conversion-electron spectroscopy and by gamma-ray angular distributions from low-temperature nuclear orientation. In addition to coexisting K(pi)=0+ bands, coexisting K(pi)=2+ bands are observed at low energy. Strong interband electric monopole transitions are observed between states of the two K(pi)=0+ bands and also between states of the two K(pi)=2+ bands. The coexistence of K(pi)=2+ bands at low energy represents a new type of collective structure. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803. OAK RIDGE ASSOCIATED UNIV,UNISOR,OAK RIDGE,TN 37831. RP XU, Y (reprint author), OREGON STATE UNIV,DEPT PHYS,CORVALLIS,OR 97331, USA. NR 15 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 29 PY 1992 VL 68 IS 26 BP 3853 EP 3856 DI 10.1103/PhysRevLett.68.3853 PG 4 WC Physics, Multidisciplinary SC Physics GA JA760 UT WOS:A1992JA76000009 ER PT J AU ROGERS, JH HWANG, DQ AF ROGERS, JH HWANG, DQ TI MEASUREMENTS OF BEAT-WAVE-ACCELERATED ELECTRONS IN A TOROIDAL PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTROMAGNETIC-WAVES; CURRENT DRIVE AB Electrons are accelerated by large amplitude electron plasma waves driven by counterpropagating microwaves with a difference frequency approximately equal to the electron plasma frequency. Energetic electrons are observed only when the phase velocity of the wave is in the range 3-upsilon(e) Br > CH3SO4 > Cl much greater than OH. This order is roughly correlated to the fractional micellar charge, beta, which follows the order OH > Cl > CH3SO4 approximately Br approximately NO3. Fractional charge changes very little and in an irregular fashion when n and/or surfactant concentration are in but the aggregation number increases with respect to both. C1 THREE M CO,RES LAB,IND & CONSUMER SECTOR,ST PAUL,MN 55144. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP BERR, S (reprint author), UNIV VIRGINIA,DEPT RADIOL,MR4 BLDG ROOM 1186,CHARLOTTESVILLE,VA 22908, USA. NR 15 TC 149 Z9 149 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 25 PY 1992 VL 96 IS 13 BP 5611 EP 5614 DI 10.1021/j100192a075 PG 4 WC Chemistry, Physical SC Chemistry GA JB264 UT WOS:A1992JB26400075 ER PT J AU WANG, RP THIELEMANN, FK FENG, DH WU, CL AF WANG, RP THIELEMANN, FK FENG, DH WU, CL TI MICROSCOPIC NUCLEAR-MASSES AND THEIR ASTROPHYSICAL IMPLICATIONS SO PHYSICS LETTERS B LA English DT Article ID MODEL AB Highly accurate level densities are predicted using masses derived from the microscopic fermion dynamical symmetry model. New features of this model predict a significantly different location of the astrophysical r-process path in the actinide region from that of the traditional mass model. C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. HARVARD UNIV,HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP WANG, RP (reprint author), DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104, USA. NR 15 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 25 PY 1992 VL 284 IS 3-4 BP 196 EP 200 DI 10.1016/0370-2693(92)90419-5 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JD244 UT WOS:A1992JD24400002 ER PT J AU DICUS, DA MINIC, D VAN KOLCK, U VEGA, R AF DICUS, DA MINIC, D VAN KOLCK, U VEGA, R TI THE AXIAL-VECTOR COUPLING AND MAGNETIC-MOMENT OF THE QUARK SO PHYSICS LETTERS B LA English DT Article ID MODEL AB Details of an estimate of the corrections of order 1/N to the axial vector coupling of the constituent quark, where N is the number of colors, are presented. Analogous estimate is made for the magnetic moment of the constituent quark. C1 UNIV TEXAS, DEPT PHYS, THEORY GRP, AUSTIN, TX 78712 USA. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RP DICUS, DA (reprint author), UNIV TEXAS, DEPT PHYS, CTR PARTICLE PHYS, AUSTIN, TX 78712 USA. NR 11 TC 40 Z9 40 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 JUN 25 PY 1992 VL 284 IS 3-4 BP 384 EP 389 DI 10.1016/0370-2693(92)90449-E PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JD244 UT WOS:A1992JD24400032 ER PT J AU ALDE, D BINON, FG BOUTEMEUR, M BRICMAN, C DONSKOV, SV GOUANERE, M INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KULIK, AV LANDSBERG, GL LEDNEV, AA PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP AF ALDE, D BINON, FG BOUTEMEUR, M BRICMAN, C DONSKOV, SV GOUANERE, M INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KNAPP, EA KULIK, AV LANDSBERG, GL LEDNEV, AA PEIGNEUX, JP POLOVNIKOV, SA POULET, M PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV STROOT, JP SUGONYAEV, VP TI PRODUCTION MECHANISM OF THE X(1740) MESON SO PHYSICS LETTERS B LA English DT Article ID ETA AB New data from pi-p charge-exchange at 38 GeV/c confirm the existence of the narrow X(1740) meson, observed in its eta-eta decay mode. The upper limit on its width is 80 MeV. It is not observed decaying into either eta'eta or pi-0-pi-0. This meson is produced in charge-exchange by a mechanism other than OPE with a nucleon isobar (probably DELTA(1232)), and not with a neutron. C1 INST INTERUNIV SCI NUCL,B-1050 BRUSSELS,BELGIUM. UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM. CERN,CH-1211 GENEVA 23,SWITZERLAND. INST HIGH ENERGY PHYS,PROTVINO 142284,USSR. LAB ANNECY LE VIEUX PHYS PARTICULES,F-74019 ANNECY LE VIEUX,FRANCE. RP ALDE, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 16 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 25 PY 1992 VL 284 IS 3-4 BP 457 EP 460 DI 10.1016/0370-2693(92)90461-C PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JD244 UT WOS:A1992JD24400044 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K TAJIMA, H DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, T SATO, Y TEZUKA, T BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K TAJIMA, H DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, T SATO, Y TEZUKA, T BAHK, SY KIM, SK TI CHARM MESON PRODUCTION IN 600 GEV/C PI-EMULSION INTERACTIONS SO PHYSICS LETTERS B LA English DT Article ID BRANCHING FRACTIONS; DECAYS AB We present total and differential cross sections for charm mesons produced in 600 GeV/c pi--emulsion interactions. Fits to d2-sigma/dx(F) dp(T)2 is-proportional-to (1 - Absolute value of x(F))(n)exp(- bp(T)2) for 676 electronically reconstructed D mesons with x(F) > 0 give n=4.25+/-0.24 (stat.) +/-0.23 (syst.) and b=0.76+/-0.03+/-0.03 (GeV/c)-2. The total inclusive D+ and D0 cross sections are sigma(pi--N-->D+/-; x(F) > 0)=8.66+/-0.46+/-1.96-mu-b/nucleon and sigma(pi--N-->D0/D0BAR; x(F) > 0)=22.05+/-1.37+/-4.82-mu-b/nucleon, where a linear dependence on the mean atomic weight of the target is assumed. These results are compared to next-to-leading order QCD predictions. C1 CHONMAN NATL UNIV,KWANGJU 500757,SOUTH KOREA. GYEONGSANG NATL UNIV,JINJU 660300,SOUTH KOREA. UNIV KOREA,SEOUL 136701,SOUTH KOREA. SCI EDUC INST OSAKA PREFECTURE,OSAKA 558,JAPAN. WONKWANG UNIV,IRI 570749,SOUTH KOREA. TOHO UNIV,FUNABASHI,CHIBA 274,JAPAN. UTSUNOMIYA UNIV,UTSUNOMIYA,TOCHIGI 321,JAPAN. UNIV CALIF DAVIS,DAVIS,CA 95616. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. GIFU UNIV,GIFU 50111,JAPAN. KINKI UNIV,HIGASHIOSAKA,OSAKA 577,JAPAN. KOBE UNIV,KOBE 657,JAPAN. NAGOYA UNIV,NAGOYA,AICHI 464,JAPAN. OHIO STATE UNIV,COLUMBUS,OH 43210. OKAYAMA UNIV,OKAYAMA 700,JAPAN. UNIV OKLAHOMA,NORMAN,OK 73019. OSAKA CITY UNIV,OSAKA 558,JAPAN. NAGOYA INST TECHNOL,NAGOYA,AICHI 466,JAPAN. RP KODAMA, K (reprint author), AICHI UNIV EDUC,KARIYA 448,JAPAN. RI Russ, James/P-3092-2014; Aoki, Shigeki/L-6044-2015 OI Russ, James/0000-0001-9856-9155; NR 25 TC 36 Z9 36 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 25 PY 1992 VL 284 IS 3-4 BP 461 EP 470 DI 10.1016/0370-2693(92)90462-D PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JD244 UT WOS:A1992JD24400045 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI DETERMINATION OF ALPHA-S FROM HADRONIC EVENT SHAPES MEASURED ON THE Z0 RESONANCE SO PHYSICS LETTERS B LA English DT Article ID ELECTRON-POSITRON-ANNIHILATION; FREE PERTURBATION-THEORY; JET PRODUCTION-RATES; LUND MONTE-CARLO; TO-BACK JETS; E+E-ANNIHILATION; QUANTUM CHROMODYNAMICS; ENERGY CORRELATIONS; QCD; FRAGMENTATION AB We present a study of the global event shape variables thrust and heavy jet mass, of energy-energy correlations and of jet multiplicities based on 250 000 hadronic Z0 decays. The data are compared to new QCD calculations including resummation of leading and next-to-leading logarithms to all orders. We determine the strong coupling constant alpha(s) (91.2 GeV) = 0.125 +/- 0.003 (exp) +/- 0.008 (theor). The first error is the experimental uncertainty. The second error is due to hadronization uncertainties and approximations in the calculations of the higher order corrections. C1 UNIV FLORENCE, I-50121 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. IST NAZL FIS NUCL, NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, PERURGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH7211 GENEVA, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG 188350, USSR. BULGARIAN ACAD SCI, BU-1113 SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NATL INST NUCL PHYS, ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB PHYS PARTICULES, F-74519 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, NIKHEF, 1009 DB AMSTERDAM, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, CNRS, IN2P3, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, ANHUI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. INST HOCHENERGIEPHYS, O-1615 ZEUTHEN BERLIN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), IST NAZL FIS NUCL, FLORENCE, ITALY. RI Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; Tsaregorodtsev, Andrei/E-3873-2016; van der Zwaan, Bob/F-4070-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; D'Alessandro, Raffaello/F-5897-2015; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014 OI Chmeissani, Mokhtar/0000-0002-2287-4791; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; Leijtens, Xaveer/0000-0001-7794-8236; D'Alessandro, Raffaello/0000-0001-7997-0306; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731 NR 56 TC 64 Z9 65 U1 1 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 JUN 25 PY 1992 VL 284 IS 3-4 BP 471 EP 481 DI 10.1016/0370-2693(92)90463-E PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JD244 UT WOS:A1992JD24400046 ER PT J AU RILLEMA, DP JONES, DS WOODS, C LEVY, HA AF RILLEMA, DP JONES, DS WOODS, C LEVY, HA TI COMPARISON OF THE CRYSTAL-STRUCTURES OF TRIS HETEROCYCLIC LIGAND COMPLEXES OF RUTHENIUM(II) SO INORGANIC CHEMISTRY LA English DT Article ID EXCITED-STATE; HEXAFLUOROPHOSPHATE; ELECTROCHEMISTRY; PHOTOCHEMISTRY; PHOTOCATALYST; PHOTOPHYSICS; MONONUCLEAR AB The structures of [Ru(bpy)3](PF6), (bpy = 2,2'-bipyridine) and [Ru(bpm)3](PF6)2-CH3CN (bpm = 2,2'-bipyrimidine) have been determined by single-crystal X-ray diffraction. [Ru(bpy)3](PF6)2 crystallized in the hexagonal space group P3c1BAR with cell dimensions a = 10.760 (1) angstrom, b = 10.760 (i) angstrom, c = 16.391 (3) angstrom, alpha = beta = 90-degrees gamma = 120-degrees, Z = 2, and d(calcd) = 1.74 g cm-3. Of the 1411 unique reflections (Mo K-alpha, 1-degrees less-than-or-equal-to 2-theta less-than-or-equal-to 57-degrees), 1081 reflections with I > sigma-(I) were used in full-matrix least-squares refinement. Final residuals were R(F) = 0.044. [Ru(bPm)3](PF6)2.CH3CN crystallized in the triclinic space group P1BAR with cell dimensions a = 10.552 (2) angstrom, b = 11.635 (1) angstrom, c = 14.231 (2) angstrom, alpha = 74.47 (1)degrees, beta = 81.41 (1)degrees, gamma = 75.08 (1)degrees, Z = 2, and d(calc) = 1.852 g cm-3. Of the 4269 unique reflections (Mo K-alpha, 3.5-degrees less-than-or-equal-to 2-theta less-than-or-equal-to 45-degrees), 3941 reflections with /F/ > 4.0-sigma-(F) were used in full-matrix least-squares refinement. Final residuals were R(F) = 0.028. Ru-N bond distances in [Ru(bpy)3]2+ were 2.056 (2) angstrom and average 2,067 (4) angstrom in [Ru(bpm)3]2+. Other bond distances and angles lead to the conclusion that the structures of the [Ru(bPy)3]2+ and [Ru(bpm)3]2+ cations are basically the same. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37830. RP RILLEMA, DP (reprint author), UNIV N CAROLINA,DEPT CHEM,CHARLOTTE,NC 28223, USA. NR 23 TC 139 Z9 140 U1 3 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 24 PY 1992 VL 31 IS 13 BP 2935 EP 2938 DI 10.1021/ic00039a049 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JA547 UT WOS:A1992JA54700049 ER PT J AU MILNE, T NIMLOS, M AF MILNE, T NIMLOS, M TI CHEMICAL SAFETY - INCOMPLETE PHOTOCATALYTIC OXIDATION OF TCE SO CHEMICAL & ENGINEERING NEWS LA English DT Letter C1 NATL RENEWABLE ENERGY LAB,CHEM TECHNOL RES BRANCH,GOLDEN,CO. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD JUN 22 PY 1992 VL 70 IS 25 BP 2 EP 2 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA HZ615 UT WOS:A1992HZ61500001 ER PT J AU SCHOLZ, G CURTISS, LA AF SCHOLZ, G CURTISS, LA TI ABINITIO MO CALCULATIONS OF HIGH-TEMPERATURE GASEOUS FLUORINE COMPLEXES MALF4 (M = H, LI OR NA) - A COMPARATIVE-STUDY USING DIFFERENT BASIS-SETS SO JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM LA English DT Article ID MINI-1 POWERFUL TOOL; SYSTEMATIC PREPARATION; ORBITAL SETS; ENERGY AB A comparative study of MAlF4 complexes (M = H, Li or Na) using ab initio molecular orbital theory, including correlation effects, was performed. Edge-bridged and corner-bridged structures of HAlF4 are found to be nearly equal in energy with the results quite sensitive to inclusion of correlation effects and diffuse functions. The LiAlF4 complex bas an edge-bridged structure, whereas the edge-bridged and face-bridged structures of NaAlF4 are of nearly equal stability. Basis set superposition error for the MINI-1 and MINI-1+ basis sets was also investigated. C1 ARGONNE NATL LAB, DIV MAT SCI, DIV CHEM TECHNOL, ARGONNE, IL 60439 USA. RP CTR INORGAN POLYMERS, RUDOWER CHAUSSEE 5, O-1199 BERLIN, GERMANY. NR 39 TC 20 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 J MOL STRUC-THEOCHEM JI Theochem-J. Mol. Struct. PD JUN 22 PY 1992 VL 90 IS 3-4 BP 251 EP 260 DI 10.1016/0166-1280(92)85068-V PG 10 WC Chemistry, Physical SC Chemistry GA JD698 UT WOS:A1992JD69800006 ER PT J AU OGILBY, PR DILLON, MP KRISTIANSEN, M CLOUGH, RL AF OGILBY, PR DILLON, MP KRISTIANSEN, M CLOUGH, RL TI QUENCHING OF SINGLET OXYGEN IN SOLID ORGANIC POLYMERS SO MACROMOLECULES LA English DT Article ID PHASE PHOTOSENSITIZED REACTION; METAL CHELATE STABILIZERS; MOLECULAR-OXYGEN; ABSORPTION-BAND; PHOTOREDUCTION; IRRADIATION; IDENTIFICATION; POLYPROPYLENE; 1-DELTA-GO-2; TEMPERATURE AB The quenching of singlet molecular oxygen (1-DELTA(g)O2) by 1,4-diazabicyclo[2.2.2]octane (DABCO), triphenylamine (TPA), and nickel(II) bis[diisopropyl dithiophosphatel (N) was studied in solid polystyrene (PS) and poly(methyl methacrylate) (PMMA). Quenching rate constants (k(q)) were determined by monitoring the time-resolved 1-DELTA(g)O2 phosphorescence as a function of quencher concentration in photosensitized experiments. For the efficient quencher N and the moderately efficient quencher DABCO, the rate constants determined in the polymers are smaller than those determined in liquid-phase analogs [k(q)(PMMA) < k(q)(PS) < k(q)(liquid)]. Moreover, the solids have a "leveling effect" on the N and DABCO rate constants, minimizing differences in k(q) that are quite pronounced in the liquid. These observations track a decrease in the oxygen diffusion coefficient [Do(PMMA) < D(O)(PS) < D(O)(liquid)] and are consistent with a quenching process in the polymer that is principally controlled by solute diffusion to form the 1-DELTA(g)O2-quencher encounter pair. For the poorer quencher TPA, however, where the rate of quenching is determined more by events in the 1-DELTA(g)O2-quencher encounter pair than by solute diffusion, k(q)(PMMA) > k(q)(PS) > k(q)(liquid). These data are consistent with an increase in the number of collisions between the quencher and 1-DELTA(g)O2 in the more rigid solvent cage of the solid polymer. Because differences between k(q)(polymer) and k(q)(liquid) will vary greatly as a function of the quencher efficiency, published attempts to define the role Of 1-DELTA(g)O2 in a mechanism of polymer degradation may need reinterpretation; specifically, the common practice of comparing values of k(q)(liquid) with parameters that reflect photodegradation in quencher-doped polymers may be misleading. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP OGILBY, PR (reprint author), UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131, USA. NR 46 TC 39 Z9 39 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 22 PY 1992 VL 25 IS 13 BP 3399 EP 3405 DI 10.1021/ma00039a014 PG 7 WC Polymer Science SC Polymer Science GA JA603 UT WOS:A1992JA60300014 ER PT J AU LADD, AJC FRENKEL, D AF LADD, AJC FRENKEL, D TI COMPUTER-SIMULATION STUDIES OF STATIC AND DYNAMIC SCALING IN DILUTE-SOLUTIONS OF EXCLUDED-VOLUME POLYMERS SO MACROMOLECULES LA English DT Article ID MONTE-CARLO SIMULATIONS; MOLECULAR-WEIGHT; CHAIN; DIMENSIONS; MACROMOLECULES; TEMPERATURE; SCATTERING; BENZENE; MODEL AB We have used a novel Monte Carlo method to compute the gyration radius R(G) and the hydrodynamic radius R(H) of excluded-volume polymer chains. The hydrodynamic radius scales as N(almost-equal-to)0.55 (N is the number of bonds) over at least a decade of chain lengths, whereas the gyration radius exponent is close to the theoretical value of 0.59. The anomalous behavior of R(H) is well-known experimentally; it is commonly attributed to the belief that polymers in mediocre solvents are not swollen on short length scales. However, the polymer chains in our simulations are uniformly swollen on all length scales; we suggest that the discreteness of the polymer chain is sufficient to explain the behavior of R(H). C1 FOM,INST ATOM & MOLEC PHYS,1098 SJ AMSTERDAM,NETHERLANDS. RP LADD, AJC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Frenkel, Daan/G-2580-2014 OI Frenkel, Daan/0000-0002-6362-2021 NR 21 TC 13 Z9 13 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 22 PY 1992 VL 25 IS 13 BP 3435 EP 3438 DI 10.1021/ma00039a019 PG 4 WC Polymer Science SC Polymer Science GA JA603 UT WOS:A1992JA60300019 ER PT J AU DICUS, DA GUNION, JF ORR, LH VEGA, R AF DICUS, DA GUNION, JF ORR, LH VEGA, R TI ISOLATING PURELY-LEPTONIC SIGNALS FOR STRONG W-SCATTERING USING ANTI-TAGGING, JET-TAGGING AND LEPTON ISOLATION SO NUCLEAR PHYSICS B LA English DT Article ID HEAVY FLAVOR PRODUCTION; PHYSICS; HIGGS AB We explore in depth several techniques for detecting the l+ l+ mass spectrum coming from W+ W+ scattering at a hadron collider. We focus on the signal, due to enhanced production of longitudinally polarized W+'s, that arises in the Standard Model when the Higgs boson has mass greater than or similar to 1 TeV. We demonstrate that anti-tagging against energetic centrally produced jets must be combined either with our earlier-proposed cut (requiring single-jet tagging) on the minimum jet-lepton invariant mass or with a cut on the isolation of the leptons in order to adequately suppress all backgrounds. In particular, we identify cuts that are sufficient to suppress the ttBAR-induced backgrounds below the level of the signal. Effects due to production of an extra gluon in association with the ttBAR are included. Sensitivity to distribution functions and scale choices is explored. Event rates at the LHC, SSC and Eloisatron energies are given. Use of the isolation requirement along with staged implementation of the other cuts is proposed as a means for verifying the Standard Model expectation for the W+ W+ spectrum in the case where the Higgs boson is light. Applicability of the proposed cut procedures to the purely leptonic decay modes of the W+ W-, ZZ and W +/- Z channels is outlined. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP DICUS, DA (reprint author), UNIV TEXAS,CTR PARTICLE THEORY,AUSTIN,TX 78712, USA. NR 24 TC 18 Z9 18 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN 22 PY 1992 VL 377 IS 1-2 BP 31 EP 54 DI 10.1016/0550-3213(92)90017-6 PG 24 WC Physics, Particles & Fields SC Physics GA JB981 UT WOS:A1992JB98100003 ER PT J AU ITOH, K OHTA, N AF ITOH, K OHTA, N TI BRST COHOMOLOGY AND PHYSICAL STATES IN 2-DIMENSIONAL SUPERGRAVITY COUPLED TO (C)CAP-LESS-THAN-OR-EQUAL-TO-1 MATTER SO NUCLEAR PHYSICS B LA English DT Article ID 2D GRAVITY+1D MATTER; QUANTUM-GRAVITY; COVARIANT QUANTIZATION; ISING-MODEL; RANDOM SURFACES; FIELD-THEORIES; ONE-DIMENSION; STRING THEORY; INVARIANCE; ALGEBRA AB We study the BRST cohomology for two-dimensional supergravity coupled to c less-than-or-equal-to 1 superconformal matter in the conformal gauge. The super-Liouville 'and superconformal matters are represented by free scalar fields phi(L) and phi(M) and fermions psi(L) and psi(M), respectively, with suitable background charges, and these are coupled in such a way that the BRST charge is nilpotent. The physical states of the full theory are determined for the NS and R sectors. It is shown that there are extra states with ghost number N(FP) = 0, +/-1 for discrete momenta other than the degree of freedom corresponding to the "center of mass", and that these are closely related to the "null states" in the minimal models with c < 1. C1 BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. OSAKA UNIV,COLL GEN EDUC,INST PHYS,TOYONAKA,OSAKA 560,JAPAN. RP ITOH, K (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 54 TC 26 Z9 26 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 JUN 22 PY 1992 VL 377 IS 1-2 BP 113 EP 142 DI 10.1016/0550-3213(92)90019-8 PG 30 WC Physics, Particles & Fields SC Physics GA JB981 UT WOS:A1992JB98100005 ER PT J AU PIERCE, DM PAPADOPOULOS, A JOHNSON, SB AF PIERCE, DM PAPADOPOULOS, A JOHNSON, SB TI LIMITS ON THE CP-EVEN HIGGS-BOSON MASSES IN THE MINIMAL SUPERSYMMETRIC MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUM-RULES; STANDARD MODEL; SUPERGRAVITY; PHYSICS AB We calculate corrections to the masses of the two CP-even Higgs bosons in the minimal supersymmetric model. We find an upper bound for the mass of the lighter Higgs scalar, and a lower bound for the mass of the heavier Higgs scalar. In our analysis we consider all possible variations of superparticle masses between 0.1 and 1 TeV. By requiring the light Higgs boson to be greater than the current experimental bound we rule out a region of the tan-beta-top-mass parameter space, where tan-beta is the ratio of vacuum expectation values of the two Higgs fields. We make our formalism explicit to elucidate the treatment of mass thresholds. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP PIERCE, DM (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 63 Z9 63 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 JUN 22 PY 1992 VL 68 IS 25 BP 3678 EP 3681 DI 10.1103/PhysRevLett.68.3678 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000006 ER PT J AU CARLSON, J SCHIAVILLA, R AF CARLSON, J SCHIAVILLA, R TI EUCLIDEAN PROTON RESPONSE IN LIGHT-NUCLEI SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELASTIC ELECTRON-SCATTERING; COULOMB SUM-RULE; LONGITUDINAL RESPONSE; 3-BODY NUCLEI; HE-3; TRANSVERSE; ELECTRODISINTEGRATION AB Green's-function Monte Carlo methods are used to determine the Euclidean proton response of light nuclei from a realistic Hamiltonian containing two- and three-nucleon potential models. Final-state interactions are exactly included in this approach. The calculated Euclidean proton response functions for thc He-4 nucleus are found to be in excellent agreement with those obtained from an analysis of the longitudinal response functions measured in (e,e') experiments at thc Bates and Saclay laboratories. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. INST NUCL THEORY,SEATTLE,WA. RP CARLSON, J (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 30 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 22 PY 1992 VL 68 IS 25 BP 3682 EP 3685 DI 10.1103/PhysRevLett.68.3682 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000007 ER PT J AU SPERBER, W BECKER, D LYNN, KG RAITH, W SCHWAB, A SINAPIUS, G SPICHER, G WEBER, M AF SPERBER, W BECKER, D LYNN, KG RAITH, W SCHWAB, A SINAPIUS, G SPICHER, G WEBER, M TI MEASUREMENT OF POSITRONIUM FORMATION IN POSITRON COLLISIONS WITH HYDROGEN-ATOMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID WAVE BORN APPROXIMATION; ELECTRON-IMPACT; GALACTIC-CENTER; CROSS-SECTIONS; SCATTERING; IONIZATION; HELIUM; BEAM AB The positronium-formation cross section was measured for positron collisions with atomic hydrogen in a crossed-beam experiment. Measurements were made in the energy range of 13 eV less-than-or-equal-to E less-than-or-equal-to 205 eV. At E = 15 +/- 2.8 eV we observed a maximum cross section of (4.3 +/- 0.8) x 10(-16) cm2; because of averaging over an energy-resolution function of 6.5 eV FWHM, the observed maximum is a lower limit of the true maximum. For E greater-than-or-equal-to 75 eV thc cross section is zero within our error margin of 0.3 x 10(-16) cm2 . No other measurements but numerous theoretical predictions are available for comparison. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SPERBER, W (reprint author), UNIV BIELEFELD,FAK PHYS,W-4800 BIELEFELD,GERMANY. NR 40 TC 76 Z9 76 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 JUN 22 PY 1992 VL 68 IS 25 BP 3690 EP 3693 DI 10.1103/PhysRevLett.68.3690 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000009 ER PT J AU KWAK, BS ERBIL, A WILKENS, BJ BUDAI, JD CHISHOLM, MF BOATNER, LA AF KWAK, BS ERBIL, A WILKENS, BJ BUDAI, JD CHISHOLM, MF BOATNER, LA TI STRAIN RELAXATION BY DOMAIN FORMATION IN EPITAXIAL FERROELECTRIC THIN-FILMS SO PHYSICAL REVIEW LETTERS LA English DT Article AB The origin of strain-induced, modulated domain structures observed in epitaxial ferroelectric lead titanate thin-films is discussed using a phenomenological total-energy calculation. Linear elasticity is used to account for the substrate contribution while a free-energy functional of the Landau-Ginzburg-Devonshire type is used to calculate the domain-wall and the polarization contributions from the film. Good agreement between the predictions of this model and the experimental results is found for thickness-dependent properties such as the relative domain population and spontaneous strain. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. BELL COMMUN RES INC,RED BANK,NJ 07701. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Boatner, Lynn/I-6428-2013; Budai, John/R-9276-2016 OI Boatner, Lynn/0000-0002-0235-7594; Budai, John/0000-0002-7444-1306 NR 21 TC 131 Z9 131 U1 3 U2 22 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 22 PY 1992 VL 68 IS 25 BP 3733 EP 3736 DI 10.1103/PhysRevLett.68.3733 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000020 ER PT J AU BERKOWITZ, AE MITCHELL, JR CAREY, MJ YOUNG, AP ZHANG, S SPADA, FE PARKER, FT HUTTEN, A THOMAS, G AF BERKOWITZ, AE MITCHELL, JR CAREY, MJ YOUNG, AP ZHANG, S SPADA, FE PARKER, FT HUTTEN, A THOMAS, G TI GIANT MAGNETORESISTANCE IN HETEROGENEOUS CU-CO ALLOYS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have observed giant magnetoresistance in heterogeneous thin film Cu-Co alloys consisting of ultrafine Co-rich precipitate particles in a Cu-rich matrix. The magnetoresistance scales inversely with the average particle diameter. This behavior is modeled by including spin-dependent scattering at the interfaces between the particles and the matrix, as well as the spin-dependent scattering in the Co-rich particles. C1 UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,LA JOLLA,CA 92093. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. NYU,DEPT PHYS,NEW YORK,NY 10003. RP BERKOWITZ, AE (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. RI Hutten, Andreas/B-3524-2011; Zhang, Shufeng/G-7833-2011 NR 16 TC 1500 Z9 1535 U1 9 U2 81 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 22 PY 1992 VL 68 IS 25 BP 3745 EP 3748 DI 10.1103/PhysRevLett.68.3745 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000023 ER PT J AU ZHANG, XG BUTLER, WH AF ZHANG, XG BUTLER, WH TI SIMPLE CELLULAR METHOD FOR THE EXACT SOLUTION OF THE ONE-ELECTRON SCHRODINGER-EQUATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIPLE-SCATTERING THEORY AB We present a simple cellular method for the exact solution of the single-particle Schrodinger equation of a complex system. It uses basis functions which are locally exact solutions within each potential cell. The wave-function expansion coefficients are determined by the boundary conditions between the neighboring cells, which can be specified on spheres instead of the cell boundaries. The method can yield an exact first-principles tight-binding theory with only nearest-neighbor couplings. Tests of the method using the two-dimensional empty lattice and the hydrogen molecule ion indicate that it converges rapidly and yields accurate results. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP ZHANG, XG (reprint author), UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40506, USA. NR 18 TC 7 Z9 7 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 JUN 22 PY 1992 VL 68 IS 25 BP 3753 EP 3756 DI 10.1103/PhysRevLett.68.3753 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000025 ER PT J AU BULAEVSKII, LN LEDVIJ, M KOGAN, VG AF BULAEVSKII, LN LEDVIJ, M KOGAN, VG TI FLUCTUATIONS OF VORTICES IN LAYERED HIGH-TC SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID VORTEX; LATTICE AB The temperature T(s) of spontaneous creation of vortex lines in Josephson coupled layered superconductors is obtained by taking into account the entropy contribution to the free energy due to thermal distortions. For Bi- and Tl-based high-T(c) superconductors and superlattices, the superconducting critical temperature T(s) lies noticeably below the mean-field transition temperature T(c0) (T(c0) - T(s) almost-equal-to 4 K or more). The contribution of thermal distortions to the free energy causes significant changes in the temperature and field dependences of magnetization below T(s) seen in Bi compounds. C1 INST PHYS,BELGRADE,YUGOSLAVIA. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP BULAEVSKII, LN (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 271 Z9 271 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 JUN 22 PY 1992 VL 68 IS 25 BP 3773 EP 3776 DI 10.1103/PhysRevLett.68.3773 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000030 ER PT J AU TAKAGI, H CAVA, RJ MAREZIO, M BATLOGG, B KRAJEWSKI, JJ PECK, WF BORDET, P COX, DE AF TAKAGI, H CAVA, RJ MAREZIO, M BATLOGG, B KRAJEWSKI, JJ PECK, WF BORDET, P COX, DE TI DISAPPEARANCE OF SUPERCONDUCTIVITY IN OVERDOPED LA2-XSRXCUO4 AT A STRUCTURAL PHASE-BOUNDARY SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON-DIFFRACTION; TL2BA2CACU2O8; TC AB The electronic and structural phase diagram of heavily doped La2-xSrxCuO4 (0.15 less-than-or-equal-to x less-than-or-equal-to 0.3) is reexamined. We demonstrate that the disappearance of superconductivity in "overdoped" La2-xSrxCuO4 is associated with an orthorhombic to tetragonal structural phase transition near x = 0.2, implying a relationship between superconductivity and subtle structural change. The bulk superconducting phase is thus confined to a much narrower composition range than believed. A complete solid solution of La and Sr is observed in the composition range investigated. C1 UNIV JOSEPH FOURIER, CRISTALLOG LAB, CNRS, F-38042 GRENOBLE 09, FRANCE. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP TAKAGI, H (reprint author), AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. RI Takagi, Hidenori/B-2935-2010 NR 16 TC 181 Z9 181 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 22 PY 1992 VL 68 IS 25 BP 3777 EP 3780 DI 10.1103/PhysRevLett.68.3777 PG 4 WC Physics, Multidisciplinary SC Physics GA HZ980 UT WOS:A1992HZ98000031 ER PT J AU JAYASOORIYA, UA KETTLE, SFA MORTIMER, R ECKERT, J MCGUIRE, NK AF JAYASOORIYA, UA KETTLE, SFA MORTIMER, R ECKERT, J MCGUIRE, NK TI HETERIONIC VIBRATIONAL COUPLING IN CRYSTALLINE METHYLAMMONIUM NITRATE SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article AB Heterionic vibrational coupling is shown to exist between the CH3 and NH3 deformation modes of the monomethylammonium cation and the antisymmetric stretching mode, nu(N-O), of the nitrate anion in the salt monomethylammonium nitrate in the solid state. It is concluded that neither a dipole-dipole nor a hydrogen-bonding mechanism separately provides an adequate explanation of these couplings. A clear relationship between the spectra and crystal pseudosymmetry is also shown to exist. C1 UNIV E ANGLIA,SCH CHEM SCI,NORWICH NR4 7TJ,NORFOLK,ENGLAND. LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. NR 11 TC 2 Z9 2 U1 0 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD JUN 21 PY 1992 VL 88 IS 12 BP 1631 EP 1636 DI 10.1039/ft9928801631 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JA948 UT WOS:A1992JA94800007 ER PT J AU NEWMAN, WI NEWMAN, AL LOVELACE, RVE AF NEWMAN, WI NEWMAN, AL LOVELACE, RVE TI INITIATION OF BIPOLAR FLOWS BY MAGNETIC-FIELD TWISTING IN PROTOSTELLAR NEBULAE SO ASTROPHYSICAL JOURNAL LA English DT Article DE INSTABILITIES; ISM, KINEMATICS AND DYNAMICS; MHD; STARS, FORMATION ID ACCRETION DISKS; STAR FORMATION; OUTFLOWS; OBJECTS; WINDS AB A model is developed for the time-dependent twisting of an initial poloidal magnetic field threading a conducting protostellar disk. The region outside the disk is assumed to be filled, at least initially, with a low-density, force-free "coronal" plasma. The differential rotation of the disk acts to twist the B field in the space outside the disk thus generating a toroidal magnetic field. In turn, the toroidal field acts to pinch the plasma and the poloidal field toward the system axis producing a collimated channel. This channel could facilitate the formation of bipolar flows. The magnitude and duration of the field twisting is expected to be limited by magnetohydrodynamic instability. C1 UNIV CALIF LOS ANGELES,DEPT SPACE SCI,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87544. CALIF STATE UNIV DOMINGUEZ HILLS,DEPT PHYS,CARSON,CA 90747. CORNELL UNIV,DEPT APPL PHYS,ITHACA,NY 14853. CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853. RP NEWMAN, WI (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH SCI,4640 GEOL BLDG,405 HILGARD AVE,LOS ANGELES,CA 90024, USA. RI Newman, William/E-5918-2011 OI Newman, William/0000-0002-9835-1428 NR 20 TC 26 Z9 26 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 JUN 20 PY 1992 VL 392 IS 2 BP 622 EP 627 DI 10.1086/171462 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY145 UT WOS:A1992HY14500026 ER PT J AU JUSTTANONT, K BARLOW, MJ SKINNER, CJ TIELENS, AGGM AF JUSTTANONT, K BARLOW, MJ SKINNER, CJ TIELENS, AGGM TI THE NATURE OF DUST AROUND THE POST ASYMPTOTIC GIANT BRANCH OBJECTS HD-161796 AND HD-179821 SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; DUST, EXTINCTION; INFRARED, STARS; STARS, SUPERGIANTS ID PROTO-PLANETARY NEBULAE; NGC-6302; STARS; SUPERGIANTS; SPECTRA; GRAINS AB Ground-based 7.4-24-mu-m spectra of two post-AGB objects, HD 161796 and HD 179821, show emission features at 10-12-mu-m and at 19-mu-m. These features also appear to be present in the IRAS LRS spectrum of another post-AGB object, Roberts 22. HD 161796 and HD 179821 also exhibit a very rapid increase in flux between 13 and 15.5-mu-m. In view of the O-rich photosphere of HD 161796 and the presence of OH maser emission around all three objects, we ascribe these features to various oxides. However, the observed spectral features are quite different from the canonical silicate features observed in most O-rich giants. The 10-12 and 19-mu-m bands may be due to olivines and the rapid rise in flux between 13 and 15.5-mu-m may be due to iron oxides. We argue that HD 161796 and the bipolar nebulae Roberts 22 and NGC 6302 have all undergone the third dredge-up, with most of the dredged-up carbon having been converted to nitrogen by envelope-burning. Carbon-rich grain material, produced during the interval between the end of the third dredge-up and the moment when envelope burning finally reduced the C/O ratio below unity again, could be responsible for the UIR bands now being excited in Roberts 22 and NGC 6302. C1 NUFFIELD RADIO ASTRON LAB,LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,JODRELL BANK,CA. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP JUSTTANONT, K (reprint author), UNIV LONDON UNIV COLL,DEPT PHYS & ASTRON,GOWER ST,LONDON WC1E 6BT,ENGLAND. RI Barlow, Michael/A-5638-2009 OI Barlow, Michael/0000-0002-3875-1171 NR 32 TC 21 Z9 21 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 JUN 20 PY 1992 VL 392 IS 2 BP L75 EP L78 DI 10.1086/186429 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY146 UT WOS:A1992HY14600008 ER PT J AU ROADS, JO CHEN, SC KAO, J LANGLEY, D GLATZMAIER, G AF ROADS, JO CHEN, SC KAO, J LANGLEY, D GLATZMAIER, G TI GLOBAL ASPECTS OF THE LOS-ALAMOS GENERAL-CIRCULATION MODEL HYDROLOGIC-CYCLE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID GROUND SURFACE-TEMPERATURE; PRECIPITATION FLUCTUATIONS; EFFICIENT PREDICTION; LAND AREAS; MOISTURE; 30-DEGREES-S; SIMULATIONS; VEGETATION; INCLUSION; JANUARY AB The global hydrologic cycle in the Los Alamos general circulation model (GCM) is compared to available global observations. Global observations of the water vapor, water-vapor flux and water-vapor flux divergence are derived from the National Meteorological Center's final analysis for the period 1986-1989. The new precipitation data set of Legates and Willmott (1990) is used for the global precipitation observations. Global evaporation is derived as a residual of the precipitation and water-vaporflux divergence. There are a number of similarities as well as discrepancies between the GCM and observations. The large-scale nondivergent and divergent GCM circulations are remarkably similar to the observed circulations; the large-scale GCM precipitation and evaporation patterns are also qualitatively similar to observations. Discrepancies are mainly quantitative and small-scale in nature: the GCM atmosphere is relatively dry which results in a slightly greater evaporation and precipitation rate than is observed; the GCM South Pacific convergence zone is displaced too far to the northwest. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. RP ROADS, JO (reprint author), UNIV CALIF SAN DIEGO, DIV CLIMATE RES, 0224, LA JOLLA, CA 92093 USA. NR 36 TC 24 Z9 24 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JUN 20 PY 1992 VL 97 IS D9 BP 10051 EP 10068 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JA769 UT WOS:A1992JA76900023 ER PT J AU XING, L TESANOVIC, Z AF XING, L TESANOVIC, Z TI DENSE VORTEX PLASMA IN TYPE-II SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID ONE-COMPONENT PLASMA; SINGLE-CRYSTAL YBA2CU3O7; HIGH-TC SUPERCONDUCTORS; STATISTICAL-MECHANICS; EQUILIBRIUM PROPERTIES; IONIZED MATTER; MONTE-CARLO; BI2.2SR2CA0.8CU2O8; SYSTEMS AB The critical behavior of quasi 2D type-II superconductors can be understood by considering an equivalent classical many-particle system with long-ranged, multiple-body interactions. We present here a numerical Monte Carlo study of the thermodynamics and structural correlations in this dense vortex plasma (DVP). In particular, we find that fluctuations strongly renormalize the mean-field transition line (H(c2)(T)) and evaluate a universal value of the DVP coupling constant characterizing the true transition line in all quasi 2D type-II systems. Along this line DVP undergoes a liquid-to-topological solid transition. We also present the pair-distribution function in the vicinity of the transition. C1 MAX PLANCK INST SOLID STATE RES,HIGH FIELD MAGNETLAB,F-38042 GRENOBLE,FRANCE. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. NR 27 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1992 VL 196 IS 3-4 BP 241 EP 246 DI 10.1016/0921-4534(92)90441-E PG 6 WC Physics, Applied SC Physics GA JC734 UT WOS:A1992JC73400004 ER PT J AU LINDEMER, TB WASHBURN, FA MACDOUGALL, CS AF LINDEMER, TB WASHBURN, FA MACDOUGALL, CS TI STUDY OF PHASE-BEHAVIOR IN THE YBA2CU3O7-X-BACUO2+Y-CUO-AG SYSTEM SO PHYSICA C LA English DT Article ID BA-CU OXIDES; LIQUIDUS RELATIONS; OXYGEN-PRESSURE; GRAIN-GROWTH; SILVER; YBA2CU3O7-X; AG; NONSTOICHIOMETRY; SUPERCONDUCTORS; EQUILIBRIA AB The temperature (T) and oxygen pressure (pO2) conditions were determined from 6 Pa to 0.1 MPa O2 for several equilibria in the YBa2Cu3O7-x-BaCuO2+y-CuO-Ag system. These included the y-T-pO2 interrelationships, the T-pO2 conditions for decomposition of BaCuO2+y, and the effects of Ag on several eutectic and peritectic temperatures. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RP LINDEMER, TB (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 64 TC 67 Z9 67 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 JUN 20 PY 1992 VL 196 IS 3-4 BP 390 EP 398 DI 10.1016/0921-4534(92)90462-L PG 9 WC Physics, Applied SC Physics GA JC734 UT WOS:A1992JC73400025 ER PT J AU PHILLIPS, JL BAME, SJ GOSLING, JT MCCOMAS, DJ GOLDSTEIN, BE SMITH, EJ BALOGH, A FORSYTH, RJ AF PHILLIPS, JL BAME, SJ GOSLING, JT MCCOMAS, DJ GOLDSTEIN, BE SMITH, EJ BALOGH, A FORSYTH, RJ TI ULYSSES PLASMA OBSERVATIONS OF CORONAL MASS EJECTIONS NEAR 2.5 AU SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The Ulysses solar wind plasma experiment observed a series of interplanetary shocks and coronal mass ejections (CMEs), the latter evidenced by counterstreaming electrons and a variety of ion signatures, during March and April 1991. A striking sequence was observed near 2.5 AU from March 23 through April 2, with the second of two counterstreaming events lasting 6.4 days. We summarize the plasma observations for these features, suggesting that the second counterstreaming period may be two juxtaposed CMEs. The relationship between the events observed at Ulysses, approximately 60-degrees east of Earth in ecliptic longitude, and those causing a geomagnetic storm on March 24, is unclear. C1 JET PROP LAB,PASADENA,CA 91109. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP PHILLIPS, JL (reprint author), LOS ALAMOS NATL LAB,MS-D438,LOS ALAMOS,NM 87545, USA. NR 9 TC 27 Z9 27 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 JUN 19 PY 1992 VL 19 IS 12 BP 1239 EP 1242 DI 10.1029/92GL00529 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JA744 UT WOS:A1992JA74400016 ER PT J AU KRUPP, N KEPPLER, E FRANZ, M KORTH, A WITTE, M MOUSSAS, X BLAKE, JB NAIDU, K QUENBY, JJ WOCH, J BALOGH, A BAME, S AF KRUPP, N KEPPLER, E FRANZ, M KORTH, A WITTE, M MOUSSAS, X BLAKE, JB NAIDU, K QUENBY, JJ WOCH, J BALOGH, A BAME, S TI ENERGETIC PARTICLE COMPOSITION VARIATIONS DURING THE MARCH 1991 EVENTS MEASURED WITH THE ULYSSES EPAC INSTRUMENT SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID INTERPLANETARY SHOCKS; SOLAR-FLARES; ACCELERATION AB We report on energetic particle measurements obtained with the EPAC instrument on board the Ulysses spacecraft during March 1991, when a series of important flares occurred at the Sun. The EPAC instrument measures electrons (0.1-0.38 MeV), protons (0.3-1.5 MeV) and heavy ions (0.2-6.0 MeV/N). We discuss the time interval March 22 through March 29 (DOY 81 through 88) and divide this interval in three periods with different ion compositions. At a quasi-perpendicular shock on March 23, shock drift acceleration of protons, helium and electrons was observed. Thirteen hours after this shock the energetic ion composition changed dramatically by almost two orders of magnitude, signalling the arrival of a coronal mass ejection (CME) or driver gas. This driver gas was still present at the spacecraft when a second quasi-perpendicular shock passed the spacecraft. The ratio Fe/O increased from 0.6 to 1.0 indicative of a connection to solar particles for about 6 hours after the second shock. The second shock did not accelerate ions as well and electrons not at all. Six hours after this shock the same oxygen and iron composition was observed as before, indicating that the second shock did not alter the energetic ion composition. A third ion composition was observed before the driver gas disappeared which was significantly different from those observed before the first and between the two shocks. C1 SWEDISH INST SPACE PHYS,KIRUNA,SWEDEN. UNIV ATHENS,DEPT PHYS,ATHENS,GREECE. AEROSPACE CORP,SPACE SCI LAB,LOS ANGELES,CA 90009. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,LONDON SW7 2AZ,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP KRUPP, N (reprint author), MAX PLANCK INST AERON,W-3411 KATLENBURG DUHM,GERMANY. NR 6 TC 5 Z9 5 U1 0 U2 0 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 JUN 19 PY 1992 VL 19 IS 12 BP 1255 EP 1258 DI 10.1029/92GL01035 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JA744 UT WOS:A1992JA74400020 ER PT J AU BURTON, ME SMITH, EJ GOLDSTEIN, BE BALOGH, A FORSYTH, RJ BAME, SJ AF BURTON, ME SMITH, EJ GOLDSTEIN, BE BALOGH, A FORSYTH, RJ BAME, SJ TI ULYSSES - INTERPLANETARY SHOCKS BETWEEN 1-AU AND 4-AU SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SOLAR-WIND AB The complex solar events of March 1991 are evident as a large increase in the rate of occurrence of interplanetary shocks. Using Ulysses magnetic field and plasma measurements, 32 forward shocks and 7 reverse shocks have been identified in the 280 day interval from October 26, 1990 to August 1, 1991. The March events alone have produced 9 shocks, several in association with coronal mass ejections. The shocks have been identified and analyzed to find theta(BN), the speeds in the upstream solar wind, the Mach number and the inertial speeds along the radial and magnetic field directions. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BURTON, ME (reprint author), JET PROP LAB,MS 169-506,PASADENA,CA 91109, USA. NR 15 TC 30 Z9 30 U1 0 U2 0 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 JUN 19 PY 1992 VL 19 IS 12 BP 1287 EP 1289 DI 10.1029/92GL01284 PG 3 WC Geosciences, Multidisciplinary SC Geology GA JA744 UT WOS:A1992JA74400028 ER PT J AU MCCOMAS, DJ BAME, SJ FELDMAN, WC GOSLING, JT PHILLIPS, JL AF MCCOMAS, DJ BAME, SJ FELDMAN, WC GOSLING, JT PHILLIPS, JL TI SOLAR-WIND HALO ELECTRONS FROM 1-4 AU SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID GLOBAL PROCESSES; 1-AU AB In this study we use observations from the Ulysses solar wind electron spectrometer to make a first examination of the evolution of the solar wind suprathermal or halo electron population as a function of heliocentric distance beyond 1 AU. Solar wind electron analyzers previously flown to distances > 1 AU did not resolve the halo electron distribution so that the 3-D suprathermal solar wind electron observations from Ulysses represent a unique data set. As the core population cools with increasing heliocentric distance, no gap is formed between the core and halo populations. Rather, the halo electrons extend to increasingly lower energies. As predicted previously on theoretical grounds, the ratio of the core electron temperature to the low energy cutoff of the halo population appears to be roughly constant with a value of approximately 7.5. The total integrated heat flux drops rapidly with increasing heliocentric distance; we find a best fit power law of R-2.36. In addition, we find that the ratio of the halo to core densities is roughly constant over heliocentric distance with the halo representing 4% of the total electron distribution. These results suggest that the halo population may not consist of truly non-interactive test particles over the heliocentric range of 1-4 AU. RP MCCOMAS, DJ (reprint author), LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,MS D438,LOS ALAMOS,NM 87545, USA. NR 8 TC 29 Z9 29 U1 0 U2 0 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 JUN 19 PY 1992 VL 19 IS 12 BP 1291 EP 1294 DI 10.1029/92GL00631 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JA744 UT WOS:A1992JA74400029 ER PT J AU GOLSHANSHIRAZI, S GUIOCHON, G AF GOLSHANSHIRAZI, S GUIOCHON, G TI COMPARISON OF THE VARIOUS KINETIC-MODELS OF NONLINEAR CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID NONLINEAR CHROMATOGRAPHY; LIQUID-CHROMATOGRAPHY; AFFINITY-CHROMATOGRAPHY; OPTIMIZATION; PARAMETERS; EXCHANGE AB It is not possible to separate simply the influences of a slow mass transfer kinetics and of a slow kinetics of adsorption-desorption on the elution profile of a component. Four kinetic models of chromatography are studied: (i) the Thomas or reaction model, which assumes Langmuir kinetics of adsorption-desorption and no axial dispersion; (ii) the reaction-dispersive model, which uses the same Langmuir kinetics as the Thomas model but assumes a finite axial dispersion; (iii) a transport model, which uses the linear solid film driving force model to account for a slow kinetics of mass transfer and assumes no axial dispersion; and (iv) a transport-dispersive model, using the same mass transfer kinetics as the transport model and assumes finite axial dispersion. The analytical solution of the Thomas model can be fitted, with an accuracy which exceeds the precision of experimental measurements, on bands calculated using either one of the other three kinetic models of chromatography. Thus, the Thomas model, which assumes a slow adsorption-desorption kinetics and infinitely fast mass transfer kinetics, accounts very well for profiles calculated with a model making the reverse assumption. However, the values of the lumped kinetic coefficient obtained by curve fitting depend on the sample amount. Thus, the examination of an elution profile and its fitting to a model do not permit an easy solution of the inverse problem of chromatography. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 34 TC 42 Z9 42 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 19 PY 1992 VL 603 IS 1-2 BP 1 EP 11 DI 10.1016/0021-9673(92)85340-Y PG 11 WC Chemistry, Analytical SC Chemistry GA JB262 UT WOS:A1992JB26200001 ER PT J AU MA, ZD GUIOCHON, G AF MA, ZD GUIOCHON, G TI COMPARISON BETWEEN THE HODOGRAPH TRANSFORM METHOD AND FRONTAL CHROMATOGRAPHY FOR THE MEASUREMENT OF BINARY COMPETITIVE ADSORPTION-ISOTHERMS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID NONLINEAR LIQUID-CHROMATOGRAPHY; COMPUTER-SIMULATION; BAND PROFILES; EQUILIBRIUM; PROPAGATION; MIXTURE; MODELS AB Frontal analysis is an accurate method of isotherm determination. However, for the study of binary competitive isotherms, it requires a large number of measurements, it is time consuming and it needs excessive amounts of pure chemicals. The hodograph transform method is of considerable interest because it uses much smaller amounts of chemicals. It requires validation. In this work, the potential precision and accuracy of the two methods were compared and the optimum experimental conditions for each were determined on the basis of simulation study. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 26 TC 18 Z9 19 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 19 PY 1992 VL 603 IS 1-2 BP 13 EP 25 DI 10.1016/0021-9673(92)85341-P PG 13 WC Chemistry, Analytical SC Chemistry GA JB262 UT WOS:A1992JB26200002 ER PT J AU ROLISON, DR THIEL, PA STACY, AM RICHMOND, GL RICE, JK PEMBERTON, JE OSTERYOUNG, JG OGRADY, WE NOWAK, RJ LICHTER, RL AF ROLISON, DR THIEL, PA STACY, AM RICHMOND, GL RICE, JK PEMBERTON, JE OSTERYOUNG, JG OGRADY, WE NOWAK, RJ LICHTER, RL TI WOMEN IN SCIENCE - RESPONSE SO SCIENCE LA English DT Letter C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV OREGON,DEPT CHEM,EUGENE,OR 97403. UNIV OREGON,INST CHEM PHYS,EUGENE,OR 97403. USN,CHEM DYNAM & DIAGNOST BRANCH,WASHINGTON,DC 20375. UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. CAMILLE & HENRY DREYFUS FDN,NEW YORK,NY 10022. RP ROLISON, DR (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 19 PY 1992 VL 256 IS 5064 BP 1614 EP 1615 DI 10.1126/science.256.5064.1614-e PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HZ174 UT WOS:A1992HZ17400017 PM 17841068 ER PT J AU MAZER, JJ BATES, JK BRADLEY, JP BRADLEY, CR STEVENSON, CM AF MAZER, JJ BATES, JK BRADLEY, JP BRADLEY, CR STEVENSON, CM TI ALTERATION OF TEKTITE TO FORM WEATHERING PRODUCTS SO NATURE LA English DT Article ID CRETACEOUS-TERTIARY BOUNDARY; GLASS AB RECENT use of tektites as evidence for a bolide impact at the Cretaceous/Tertiary (K/T) boundary has focused attention on their long-term stability 1-5. It was proposed in these studies that residual clay features with the spherical tektite morphology result from in situ alteration of the original glassy material. By contrast, examination of tektite alteration as an analogue for the long-term degradation of nuclear waste glass has revealed no evidence of alteration, hydration or devitrification either for samples found in nature or for those reacted in the laboratory 6-9: no residual clay minerals were observed, and therefore the glass was interpreted as having reacted by a complete dissolution or etching process 10-12. Here we show that these apparently incongruent observations can be reconciled through understanding the relationship between the environment in which the glass reacts and the chemical processes that control the reaction rate. We have examined both natural and experimental alteration of tektites and have found that, under conditions of restricted water contact, tektite reaction is dominated by water diffusion and in situ hydrolysis of the glass structure, followed by restructuring of the silicate network to form clays. Over time, the effective rate for these processes is lower than that for etching. Thus alteration of tektites to clays, as observed at the K/T boundary, can proceed only under conditions of limited water contact. C1 MCCRONE ASSOCIATES INC,WESTMONT,IL 60559. ARCHAEOL SERV CONSULTANTS,COLUMBUS,OH 43202. RP MAZER, JJ (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 28 TC 18 Z9 18 U1 1 U2 5 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 18 PY 1992 VL 357 IS 6379 BP 573 EP 576 DI 10.1038/357573a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HZ112 UT WOS:A1992HZ11200047 ER PT J AU BULLOCK, RM BRAMMER, L SCHULTZ, AJ ALBINATI, A KOETZLE, TF AF BULLOCK, RM BRAMMER, L SCHULTZ, AJ ALBINATI, A KOETZLE, TF TI LOW-TEMPERATURE NEUTRON-DIFFRACTION STUDY OF HMN2RE(CO)14 AND STUDIES OF A METAL METAL EXCHANGE EQUILIBRIUM THAT CONVERTS HMN2RE(CO)14 INTO HMNRE2(CO)14 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTRON-PARAMAGNETIC RESONANCE; X-RAY-DIFFRACTION; SINGLE-CRYSTAL; MOLECULAR-STRUCTURE; ELIMINATION-REACTIONS; HYDRIDE COMPLEXES; BOND; HYDROGEN; MECHANISMS; LIGANDS AB The crystal and molecular structure of (CO)5Re(mu-H)Mn(CO)5, prepared from reaction of Mn2(CO)9(eta-1-tolualdehyde) with HRe(CO)5, has been determined from neutron diffraction measurements at 15 K; unit-cell constants, a = 9.145 (1) angstrom, b = 15.557 (3) angstrom, c = 14.040 (3) angstrom, beta = 106.60 (2)-degrees, monoclinic, space group P2(1)/n, Z = 4, V = 1914.2 (6) angstrom3. R(F2) = 0.110 for 4859 reflections with F-0(2) greater-than-or-equal-to 3-sigma(F02) and (sin-theta/lambda)max = 1.054 angstrom-1. The Re-H distance (1.827 (4) angstrom) is longer than the Mn-H distance (1.719 (5) angstrom). Spectroscopic and crystallographic data indicate that a small amount (approximately 9%) of (CO)5Re(mu-H)Mn(CO)4Re(CO)5 has cocrystallized with the major component. Further evidence for the identity of (CO)5Re(mu-H)Mn(CO)4Re(CO)5 comes from an independent synthesis by a known route. A mechanism is proposed that accounts for the formation of (CO)5Re(mu-H)Mn(CO)4Re(CO)5 from the reaction of (CO)5Re(A-H)Mn(CO)4Mn(CO)5 with HRe(CO)5. The equilibrium constant for the metal-metal exchange equilibrium, (CO)5Re(mu-H)Mn(CO)4Mn(CO)5 + HRe(CO)5 half arrow right over half arrow left (CO)5Re(mu-H)Mn(CO)4Re(CO)5 + HMn(CO)5, has been determined; K(eq) = 1.00 +/- 0.05 at 22-degrees-C in C6D6. C1 UNIV MILAN,INST PHARMACEUT CHEM,I-20131 MILAN,ITALY. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BULLOCK, RM (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Bullock, R. Morris/L-6802-2016; Albinati, Alberto/I-1262-2015 OI Bullock, R. Morris/0000-0001-6306-4851; Albinati, Alberto/0000-0002-8779-3327 NR 59 TC 16 Z9 16 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 17 PY 1992 VL 114 IS 13 BP 5125 EP 5130 DI 10.1021/ja00039a025 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA JA171 UT WOS:A1992JA17100025 ER PT J AU STEIN, A OZIN, GA MACDONALD, PM STUCKY, GD JELINEK, R AF STEIN, A OZIN, GA MACDONALD, PM STUCKY, GD JELINEK, R TI SILVER, SODIUM HALOSODALITES - CLASS-A SODALITES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID WAVE ROTATIONAL TRANSITIONS; POWDER NEUTRON-DIFFRACTION; NUCLEAR MAGNETIC-RESONANCE; ELECTRIC-DIPOLE MOMENT; X-RAY-DIFFRACTION; SOLID-STATE; ALUMINATE SODALITE; CRYSTAL-STRUCTURES; THERMAL-EXPANSION; ALUMINOSILICATE-SODALITES AB Class A sodalites of the composition Na8X2(SiAlO4)6 were synthesized hydrothermally (X = Cl-, Br-, I-). AgNO3 melt and hydrothermal aqueous exchanges were used to replace Na+ ions by Ag+ ions. The sodalite precursors and products were studied by chemical analysis, powder XRD, mid- and far-IR, multinuclear MAS- and DOR-NMR and optical reflectance spectroscopy. The structures of selected precursors as well as partially and fully silver exchanged sodalites were determined by Rietveld refinement of high resolution powder X-ray data. The unit cell sizes depended on the type and loading of cation and anion. Combined results from the above techniques indicated that a solid-solution structure of cages with different cation contents was formed. Organized assemblies of Na4-nAgnX3+ clusters consisting of the components of insulators (NaX) and semiconductors (AgX) were encapsulated by the cubic sodalite framework which forms perfectly periodic arrays of all-space filling 6.6 angstrom cages. The concentration and identity of cations and nature of the anion controlled the extent of vibrational and electronic coupling between clusters. Vibrational coupling was strongly mediated by the anions. Electronic interaction was possible through the framework (Na, Ag) or directly (Ag). Extended Huckel molecular orbital calculations supported the idea of band formation for an extended Na4-nAgnX3+ cluster lattice at increasing Ag+ loadings. They also aided in the assignment of the optical spectra. The calculations indicated that electronic transitions existed between clusters and the framework. C1 UNIV CALIF SANTA BARBARA, DEPT CHEM, SANTA BARBARA, CA 93106 USA. LAWRENCE BERKELEY LAB, DIV MED, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RP STEIN, A (reprint author), UNIV TORONTO, LASH MILLER CHEM LABS, 80 ST GEORGE ST, TORONTO M5S 1A1, ONTARIO, CANADA. OI jelinek, raz/0000-0002-0336-1384 NR 121 TC 44 Z9 46 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 17 PY 1992 VL 114 IS 13 BP 5171 EP 5186 DI 10.1021/ja00039a032 PG 16 WC Chemistry, Multidisciplinary SC Chemistry GA JA171 UT WOS:A1992JA17100032 ER PT J AU BARALT, E SMITH, SJ HURWITZ, J HORVATH, IT FISH, RH AF BARALT, E SMITH, SJ HURWITZ, J HORVATH, IT FISH, RH TI HOMOGENEOUS CATALYTIC-HYDROGENATION .6. SYNTHETIC AND MECHANISTIC ASPECTS OF THE REGIOSELECTIVE REDUCTIONS OF MODEL COAL NITROGEN, SULFUR, AND OXYGEN HETEROAROMATIC-COMPOUNDS USING THE (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)RHODIUM TRIS(ACETONITRILE) DICATION COMPLEX AS THE CATALYST PRECURSOR SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID METAL CARBONYL HYDRIDES; GAS SHIFT CONDITIONS; HYDRODENITROGENATION REACTION; HETEROGENEOUS CATALYSIS; IRIDIUM COMPLEXES; RHODIUM; RUTHENIUM AB The synthetic and mechanistic aspects of the regioselective hydrogenation of representative mono and polynuclear heteroaromatic nitrogen, sulfur, and oxygen model coal compounds such as 2-methylpyridine (1), N-methylindole (2), benzofuran (3), benzothiophene (4), quinoline (5), 2-methylquinoline (6), 5,6- and 7,8-benzoquinolines (7 and 8), and acridine (9) were studied with a (eta-5-pentamethylcyclopentadienyl)rhodium tris(acetonitrile) dicationic complex, [Cp*Rh(CH3CN)3]2+, as the catalyst precursor. The order of relative rates as a function of structure was found to be 8 >>> 9 > 5 > 7 > 6 > 4 >> 1-3. Competitive hydrogenation experiments of 5 with other model coal compounds, 1-4, 6-9, pyridine (10), and isoquinoline (11) and its regioselective reduction product, 1,2,3,4-tetrahydroquinoline (12), showed the following effects on the initial hydrogenation rate of 5: no effect (2-4), enhancement (8), and inhibition (9-12). In addition, 7,8-benzoquinoline (8) and its reduced product, 1,2,3,4-tetrahydro-7,8-benzoquinoline (13), were found to also enhance the initial hydrogenation rates of 2, 6, and 7; a [Cp*Rh]2+-catalyzed transfer hydrogenation mechanism was invoked as one explanation for this rate enhancement by using 13-d5 in the presence of 5, which showed deuterium atom transfer to provide 12-d3. Replacement of H-2 with D2 provided information on several of the mechanistic aspects of these selective hydrogenation reactions and included reversibility in the N=C and C=C bond reductions of six-membered N heteroaromatic compounds (1, 5-9), stereoselective reduction of the C=C bond in the five-membered N, S, and O heteroaromatic ring compounds (2-4), and exchange of aromatic ring and 2-methyl group hydrogens (2-9). The catalytic hydrogenation precursor Cp*Rh complexes for ligands 1 and 5-9 had the known structural formulas [Cp*Rh(eta-1(N)-ligand)(CH3CN)2]2+, While those for 2-4 are speculated to have [Cp*Rh(eta-2-ligand)(CH3CN)2]2+ structures, eta-2 bonding of the C=C bond in the five-membered heteroaromatic ring to Cp*Rh. A partially hydrogenated pyridine intermediate, 1,2,5,6-tetrahydropyridine (14), bonded to [Cp*Rh]2+, [Cp*Rh(eta-1(N)-1,2,5,6-tetrahydropyridine)(CH3CN)2]2+ (15) was synthesized and reacted with D2 gas to provide further evidence for a possible intermediate in the selective hydrogenation process. Moreover, thermal dehydrogenation of 15 was observed with formation of a [Cp*Rh(eta-1(N)-pyridine)(CH3CN)2]2+ complex. High-pressure NMR experiments were able to further verify the above-mentioned mechanistic pathways with quinoline (5) as an example, but the identity of intermediate [Cp*RhH-quinoline]2+ complexes was not successful. An overall mechanism for selective N, S, and O heteroaromatic ring hydrogenation will be presented. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. EXXON RES & ENGN CO,CORP RES LABS,ANNANDALE,NJ 08801. RI Horvath, Istvan/M-8428-2013; Horvath, Istvan/A-6825-2010 OI Horvath, Istvan/0000-0002-6324-186X NR 33 TC 108 Z9 108 U1 0 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 JUN 17 PY 1992 VL 114 IS 13 BP 5187 EP 5196 DI 10.1021/ja00039a033 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA JA171 UT WOS:A1992JA17100033 ER PT J AU COLVIN, VL GOLDSTEIN, AN ALIVISATOS, AP AF COLVIN, VL GOLDSTEIN, AN ALIVISATOS, AP TI SEMICONDUCTOR NANOCRYSTALS COVALENTLY BOUND TO METAL-SURFACES WITH SELF-ASSEMBLED MONOLAYERS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID AQUEOUS PERMANGANATE INTERACTION; PENETRATION-CONTROLLED REACTIONS; ORGANIZED MOLECULAR ASSEMBLIES; LONG-CHAIN SURFACTANTS; GOLD SURFACES; STRUCTURAL CHARACTERIZATION; COLLOIDAL SEMICONDUCTORS; ORGANOSULFUR COMPOUNDS; MULTILAYER FILMS; CADMIUM-SULFIDE AB A method is described for attaching semiconductor nanocrystals to metal surfaces using self-assembled difunctional organic monolayers as bridge compounds. Three different techniques are presented. Two rely on the formation of self-assembled monolayers on gold and aluminum in which the exposed tail groups are thiols. When exposed to heptane solutions of cadmium-rich nanocrystals, these free thiols bind the cadmium and anchor it to the surface. The third technique attaches nanocrystals already coated with carboxylic acids to freshly cleaned aluminum. The nanocrystals, before deposition on the metals, were characterized by ultraviolet-visible spectroscopy, X-ray powder diffraction, resonance Raman scattering, transmission electron microscopy (TEM), and electron diffraction. Afterward, the nanocrystal films were characterized by resonance Raman scattering, Rutherford back scattering (RBS), contact angle measurements, and TEM. All techniques indicate the presence of quantum confined clusters on the metal surfaces with a coverage of approximately 0.5 monolayers. These samples represent the first step toward synthesis of an organized assembly of clusters as well as allow the first application of electron spectroscopies to be completed on this type of cluster. As an example of this, the first X-ray photoelectron spectra of semiconductor nanocrystals are presented. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 65 TC 540 Z9 549 U1 7 U2 93 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 17 PY 1992 VL 114 IS 13 BP 5221 EP 5230 DI 10.1021/ja00039a038 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA JA171 UT WOS:A1992JA17100038 ER PT J AU BALL, GE ONEILL, RA SCHULTZ, JE LOWE, JB WESTON, BW NAGY, JO BROWN, EG HOBBS, CJ BEDNARSKI, MD AF BALL, GE ONEILL, RA SCHULTZ, JE LOWE, JB WESTON, BW NAGY, JO BROWN, EG HOBBS, CJ BEDNARSKI, MD TI SYNTHESIS AND STRUCTURAL-ANALYSIS USING 2-D NMR OF SIALYL LEWIS-X (SLE(X)) AND LEWIS-X (LE(X)) OLIGOSACCHARIDES - LIGANDS RELATED TO E-SELECTIN [ELAM-1] BINDING SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CELL-ADHESION; SPECTROSCOPY; ENDOTHELIUM; RECOGNITION; LEX C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. GLYCOGEN INC,S SAN FRANCISCO,CA 94080. UNIV MICHIGAN,MED CTR,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT PATHOL,ANN ARBOR,MI 48109. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Ball, Graham/L-6638-2015 OI Ball, Graham/0000-0002-0716-2286 NR 19 TC 109 Z9 109 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 17 PY 1992 VL 114 IS 13 BP 5449 EP 5451 DI 10.1021/ja00039a080 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JA171 UT WOS:A1992JA17100080 ER PT J AU SMITH, S MORRIS, JE HOFF, C DAVIS, WC WELLER, RE AF SMITH, S MORRIS, JE HOFF, C DAVIS, WC WELLER, RE TI IMMUNOPHENOTYPIC CHARACTERIZATION OF OWL MONKEY PERIPHERAL-BLOOD MONONUCLEAR-CELLS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID PLASMODIUM-FALCIPARUM INFECTION; CIRCUMSPOROZOITE PROTEIN; AOTUS-TRIVIRGATUS; MALARIA; SUSCEPTIBILITY C1 PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. UNIV SO ALABAMA, COLL MED, DEPT PEDIAT, MOBILE, AL 36617 USA. WASHINGTON STATE UNIV, COLL VET MED, DEPT VET MICROBIOL & PATHOL, PULLMAN, WA 99164 USA. RP SMITH, S (reprint author), TUSKEGEE UNIV, SCH VET MED, DEPT SMALL ANIM MED & SURG, TUSKEGEE, AL 36088 USA. NR 18 TC 5 Z9 5 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 16 PY 1992 VL 653 BP 146 EP 153 DI 10.1111/j.1749-6632.1992.tb19637.x PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM564 UT WOS:A1992JM56400016 PM 1626863 ER PT J AU DELOSSANTOS, C COSMAN, M HINGERTY, BE IBANEZ, V MARGULIS, LA GEACINTOV, NE BROYDE, S PATEL, DJ AF DELOSSANTOS, C COSMAN, M HINGERTY, BE IBANEZ, V MARGULIS, LA GEACINTOV, NE BROYDE, S PATEL, DJ TI INFLUENCE OF BENZO[A]PYRENE DIOL EPOXIDE CHIRALITY ON SOLUTION CONFORMATIONS OF DNA COVALENT ADDUCTS - THE (-)-TRANS-ANTI-[BP]G.C ADDUCT STRUCTURE AND COMPARISON WITH THE (+)-TRANS-ANTI-[BP]G.C ENANTIOMER SO BIOCHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; OPTICAL ENANTIOMERS; MAMMALIAN-CELLS; BINDING; NMR; 7,8-DIOL-9,10-EPOXIDES; MUTAGENICITY; STEREOISOMERS; COMPLEXES; SEQUENCE AB Benzo[a]pyrene (BP) is an environmental genotoxin, which, following metabolic activation to 7,8-diol 9,10-epoxide (BPDE) derivatives, forms covalent adducts with cellular DNA. A major fraction of adducts are derived from the binding of N2 of guanine to the C-10 position of BPDE. The mutagenic and carcinogenic potentials of these adducts are strongly dependent on the chirality at the four asymmetric benzylic carbon atoms. We report below on the combined NMR-energy minimization refinement characterization of the solution conformation of (-)-trans-anti-[BP]G positioned opposite C and flanked by G.C base pairs in the d(C1-C2-A3-T4-C5-[BP]G6-C7-T8-A9-C10-C11).d(G12-G13-T14-A15-G16-C17-G18-A19-T20-G21-G22) duplex. Two-dimensional NMR techniques were applied to assign the exchangeable and nonexchangeable protons of the benzo[a]pyrenyl moiety and the nucleic acid in the modified duplex. These results establish Watson-Crick base pair alignment at the [BP]G6.C17 modification site, as well as the flanking C5.G18 and C7.G16 pairs within a regular right-handed helix. The solution structure of the (-)-trans-anti- [BP] G.C 11-mer duplex has been determined by incorporating intramolecular and intermolecular proton-proton distances defined by lower and upper bounds deduced from NOE buildup curves as constraints in energy minimization computations. The BP ring spans both strands of the duplex in the minor groove and is directed toward the 3'-end of the modified strand in the refined structure. One face of the BP ring of [BP]G6 stacks over the C17 residue across from it on the partner strand while the other face is exposed to solvent. The long axis of the BP ring makes an angle of approximately 40-degrees with the average direction of the DNA helix axis and is readily accommodated within a widened minor groove of a minimally perturbed B-DNA helix. The present results on the (-)-trans-anti-BP-N2-G adduct opposite C in which the BP ring is oriented toward the 3'-end of the modified strand contrast strikingly with our previous demonstration that the mirror image (+)-trans-anti stereoisomer within the same sequence context orients the BP ring toward the 5'-end of the modified strand [Cosman et al. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 1914-19181. These orientational differences are due to the chiral characteristics of the two BPDE enantiomers and may have profound influences on the interaction of cellular enzyme systems with these two structurally different alignments of this bulky DNA lesion. C1 COLUMBIA UNIV COLL PHYS & SURG,DEPT BIOCHEM & MOLEC BIOPHYS,NEW YORK,NY 10032. OAK RIDGE NATL LAB,HLTH & SAFETY RES DIV,OAK RIDGE,TN 37831. NYU,DEPT CHEM & BIOL,NEW YORK,NY 10003. FU NCI NIH HHS [CA-20851, CA-09503, CA-2111] NR 46 TC 167 Z9 167 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 JUN 16 PY 1992 VL 31 IS 23 BP 5245 EP 5252 DI 10.1021/bi00138a002 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HZ176 UT WOS:A1992HZ17600002 PM 1606148 ER PT J AU POSNER, RG LEE, B CONRAD, DH HOLOWKA, D BAIRD, B GOLDSTEIN, B AF POSNER, RG LEE, B CONRAD, DH HOLOWKA, D BAIRD, B GOLDSTEIN, B TI AGGREGATION OF IGE RECEPTOR COMPLEXES ON RAT BASOPHILIC LEUKEMIA-CELLS DOES NOT CHANGE THE INTRINSIC AFFINITY BUT CAN ALTER THE KINETICS OF THE LIGAND IGE INTERACTION SO BIOCHEMISTRY LA English DT Article ID IMMUNOGLOBULIN-E; CROSS-LINKING; SURFACE RECEPTORS; SEROTONIN RELEASE; PLASMA-MEMBRANE; SMALL OLIGOMERS; BINDING; ASSOCIATION; ENDOCYTOSIS; DIFFUSION AB The aggregation of IgE anchored to high-affinity Fc(epsilon) receptors on rat basophilic leukemia (RBL) cells by multivalent antigens initiates transmembrane signaling and ultimately cellular degranulation. Previous studies have shown that the rate of dissociation of bivalent and multivalent DNP ligands from RBL cells sensitized with anti-DNP IgE decreases with increasing ligand incubation times. One mechanism proposed for this effect is that when IgE molecules are aggregated, a conformational change occurs that results in an increase in the intrinsic affinity of IgE for antigen. This possibility was tested by measuring the equilibrium constant for the binding of monovalent DNP-lysine to anti-DNP IgE under two conditions, where the cell-bound IgE is dispersed and where it has been aggregated into visible patches on the cell surface using anti-IgE and a secondary antibody. No difference in the equilibrium constant in these two cases was observed. We also measured the rate of dissociation of a monovalent ligand from cell surface IgE under these two conditions. Whereas the affinity for monovalent ligand is not altered by IgE aggregation, we observe that the rate of ligand dissociation from IgE in clusters is slower than the rate of ligand dissociation from unaggregated IgE. These results are discussed in terms of recent theoretical developments concerning effects of receptor density on ligand binding to cell surfaces. C1 CORNELL UNIV,BAKER LAB,DEPT CHEM,ITHACA,NY 14853. LOS ALAMOS NATL LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT MICROBIOL & IMMUNOL,RICHMOND,VA 23298. FU NIAID NIH HHS [AI22449]; NIGMS NIH HHS [GM35556, GM07273] NR 35 TC 53 Z9 53 U1 1 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 JUN 16 PY 1992 VL 31 IS 23 BP 5350 EP 5356 DI 10.1021/bi00138a015 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HZ176 UT WOS:A1992HZ17600015 PM 1534998 ER PT J AU TRAVIS, CC WANG, LA MORRIS, JM AF TRAVIS, CC WANG, LA MORRIS, JM TI COMPARISON OF THE GENE-TOX AND RTECS DATA-BASES AS PREDICTORS OF CARCINOGENIC POTENCY SO MUTATION RESEARCH LA English DT Article DE CARCINOGENIC POTENCY; RELATIVE POTENCY; SHORT-TERM ASSAYS; RTECS; GENE-TOX ID NATIONAL-TOXICOLOGY-PROGRAM; ANIMAL BIOASSAYS; CHRONOLOGICAL SUPPLEMENT; CHEMICAL-STRUCTURE; SALMONELLA; MUTAGENESIS; MUTAGENICITY; RODENTS; TESTS RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,OAK RIDGE,TN 37831, USA. 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 0921-8262 J9 MUTAT RES PD JUN 16 PY 1992 VL 279 IS 4 BP 261 EP 268 DI 10.1016/0165-1218(92)90242-R PG 8 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JA601 UT WOS:A1992JA60100006 PM 1377781 ER PT J AU KOCKS, UF CHEN, SR AF KOCKS, UF CHEN, SR TI ON THE 2 DISTINCT EFFECTS OF THERMAL-ACTIVATION ON PLASTICITY - APPLICATION TO NICKEL SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article ID ALLOYS; FLOW; DEFORMATION; TEMPERATURE; MECHANISMS; KINETICS; BEHAVIOR AB The effects of temperature and strain rate on dislocation glide at constant structure in nickel and nickel alloys are summarized in terms of their dependence on structure, making expanded use of a diagram introduced by Haasen. New results on the temperature and strain-rate dependence of the rate of strain hardening in pure nickel polycrystals are presented and analyzed in terms of thermally activated dynamic recovery, as also introduced by Haasen; in place of the starting stress for stage III strain hardening, a general scaling stress has been proposed. RP KOCKS, UF (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,MAIL STOP K765,LOS ALAMOS,NM 87545, USA. RI Kocks, Fred/E-1159-2011 NR 27 TC 11 Z9 11 U1 1 U2 5 PU AKADEMIE 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 JUN 16 PY 1992 VL 131 IS 2 BP 403 EP 413 DI 10.1002/pssa.2211310214 PG 11 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JE204 UT WOS:A1992JE20400013 ER PT J AU BUTCHER, RJ HAYDEN, HH DEYRUP, MMD STORM, CB AF BUTCHER, RJ HAYDEN, HH DEYRUP, MMD STORM, CB TI STRUCTURE OF (ANILINE)(CHLORO)BIS(ETHYLENEDIAMINE)COBALT(III) CHLORIDE MONOHYDRATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note ID ORGANOCOBALT-B12 MODELS AB C10H23ClCoN5(2+).2Cl-.H2O, M(r) = 396.64, triclinic, P1BAR, a = 8.189 (3), b = 9.502 (4), c = 12.051 (5) angstrom, alpha = 104.12 (2), beta = 101.89 (2), gamma = 100.68 (2)-degrees, V = 862.0 (1) angstrom 3, Z = 2, D(x) = 1.53 g cm-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 14.7 cm-1, F(000) = 412, room temperature, final R = 0.054 for 1893 observed reflections [I > 3-sigma(I)] out of 3540 independent reflections. The aniline and chloride are in cis positions. The aniline nitrogen is sp3 hybridized; the aniline N-Co distance is 0.07 angstrom longer than the ethylenediamine N-Co bonds. The aniline ring tilts away from the ethylenediamine chelate rings in contrast to the situation found in aniline complexes of organometallic cobalt dimethylglyoxime derivatives. An extended network of hydrogen bonds is formed by the chlorides, water, and one of the ethylenediamine N atoms. The Co-N(aniline) bonds in Co(III) aniline complexes fall into long (2.156 angstrom av.) and short (2.022 angstrom av.) groups. The long Co-N(aniline) bonds are trans to alkyl groups; the short bonds are trans to N, Cl- or I-. C1 LOS ALAMOS NATL LAB,MDO,LOS ALAMOS,NM 87545. RP BUTCHER, RJ (reprint author), HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059, USA. NR 13 TC 5 Z9 5 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 JUN 15 PY 1992 VL 48 BP 1122 EP 1124 DI 10.1107/S0108270191012040 PN 6 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JC130 UT WOS:A1992JC13000057 ER PT J AU PAL, T PAL, A MILLER, GH VO-DINH, T AF PAL, T PAL, A MILLER, GH VO-DINH, T TI PASSIVE DOSIMETER FOR MONITORING AMMONIA VAPOR SO ANALYTICA CHIMICA ACTA LA English DT Article DE FLUOROMETRY; AIR; AMMONIA; PASSIVE DOSIMETER ID SENSOR; ABSORPTION; SYSTEM; WATER AB A method is presented for ammonia detection in the vapor phase that exploits the reaction between fluorescamine and ammonia on a sodium lauryl sulfate (NaLS)-treated paper substrate. The fluorescence intensity of the aquamarine fluorescence product is used as a measure of the air vapor concentration (AVC) of ammonia. The substrate treatment with NaLS enhances the intensity of the fluorescent product and improves the reproductibility of the determination of ammonia. The paper substrate is mounted on a dosimeter and used to monitor exposure to ammonia vapor. The developed dosimeter is a self-contained, badge-sized device that passively collects ammonia on a precoated filter-paper at a rate determined by molecular diffusion. The dosimeter can detect ammonia AVC at the ppm level after only 1 min of exposure. For an 8-h exposure period the limit of detection is ca. 1 ppb. RP PAL, T (reprint author), OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, OAK RIDGE, TN 37831 USA. NR 19 TC 11 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 EI 1873-4324 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD JUN 15 PY 1992 VL 263 IS 1-2 BP 175 EP 178 DI 10.1016/0003-2670(92)85441-8 PG 4 WC Chemistry, Analytical SC Chemistry GA JA439 UT WOS:A1992JA43900022 ER PT J AU JANATA, J AF JANATA, J TI CHEMICAL SENSORS SO ANALYTICAL CHEMISTRY LA English DT Review ID ION-SELECTIVE ELECTRODES; FIELD-EFFECT TRANSISTOR; COATED-WIRE ELECTRODES; POLY(VINYL CHLORIDE) MEMBRANE; LANGMUIR-BLODGETT-FILMS; SENSITIVE ENZYME ELECTRODE; GLUCOSE-OXIDASE ELECTRODE; SEMICONDUCTOR GAS SENSORS; PHTHALOCYANINE THIN-FILMS; CARBON-PASTE ELECTRODE C1 UNIV UTAH, MAT SCI & ENGN, SALT LAKE CITY, UT 84112 USA. RP PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 1345 TC 90 Z9 91 U1 3 U2 27 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD JUN 15 PY 1992 VL 64 IS 12 BP R196 EP R219 PG 24 WC Chemistry, Analytical SC Chemistry GA HZ518 UT WOS:A1992HZ51800012 ER PT J AU KOPPENAAL, DW AF KOPPENAAL, DW TI ATOMIC MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Review ID INDUCTIVELY-COUPLED PLASMA; MICROWAVE-INDUCED PLASMA; RARE-EARTH ELEMENTS; POLYATOMIC ION INTERFERENCES; ISOTOPE-DILUTION ANALYSIS; PERFORMANCE LIQUID-CHROMATOGRAPHY; RESONANCE IONIZATION SPECTROSCOPY; EXCHANGEABLE METABOLIC POOL; BODY ENDOGENOUS SELENIUM; LONG-LIVED RADIONUCLIDES RP KOPPENAAL, DW (reprint author), PACIFIC NW LAB, MS P8-08,POB 999, RICHLAND, WA 99352 USA. NR 748 TC 20 Z9 20 U1 2 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD JUN 15 PY 1992 VL 64 IS 12 BP R320 EP R342 PG 23 WC Chemistry, Analytical SC Chemistry GA HZ518 UT WOS:A1992HZ51800018 ER PT J AU KORTRIGHT, JB KIMURA, H NIKITIN, V MAYAMA, K YAMAMOTO, M YANAGIHARA, M AF KORTRIGHT, JB KIMURA, H NIKITIN, V MAYAMA, K YAMAMOTO, M YANAGIHARA, M TI SOFT-X-RAY (97-EV) PHASE RETARDATION USING TRANSMISSION MULTILAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID VUV AB Phase retardation as a function of incidence angle of 97-eV soft x rays from a laser plasma source on transmission through a free-standing molybdenum/silicon multilayer was measured using a multilayer polarizer and a polarization analyzer. The maximum retardation of 49-degrees between sigma and pi-components is over 2/3 that calculated for an ideal structure. At maximum retardation the transmittance ratio of sigma- to pi-amplitudes was 0.66 and the intensity transmittance, averaged for both components, was 20%. These multilayer structures will be useful in soft x-ray polarization applications. C1 GRAD UNIV ADV STUDIES,DEPT SYNCHROTRON RADIAT SCI,PHOTON FACTORY,NATL LAB HIGH ENERGY PHYS,TSUKUBA 305,JAPAN. TOHOKU UNIV,SCI MEASUREMENTS RES INST,SENDAI,MIYAGI 980,JAPAN. RP KORTRIGHT, JB (reprint author), LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720, USA. NR 15 TC 52 Z9 53 U1 2 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 JUN 15 PY 1992 VL 60 IS 24 BP 2963 EP 2965 DI 10.1063/1.106802 PG 3 WC Physics, Applied SC Physics GA HY988 UT WOS:A1992HY98800005 ER PT J AU HESS, WP CHANDLER, DW THOMAN, JW AF HESS, WP CHANDLER, DW THOMAN, JW TI PHOTOFRAGMENT IMAGING - THE 205-NM PHOTODISSOCIATION OF CH3BR AND CD3BR SO CHEMICAL PHYSICS LA English DT Article ID EMISSION-SPECTROSCOPY; DYNAMICS; EXCITATION; MOLECULES AB The photofragment imaging technique is used to measure the velocity distributions of the Br(2P3/2) and Br*(2P1/2) atoms formed following laser dissociation of CH3Br and CD3Br at 205 nm. The speed and angular distributions are markedly different for the two bromine electronic states. The Br* images are anisotropic and have the appearance of a cos2-theta angular distribution indicative of a parallel transition. The Br ground-state images appear more isotropic but contain a distinct sin2-theta angular component. The speed distributions extracted from the Br* images are narrow compared with the Br speed distributions. This indicates that the sibling methyl fragments formed in the Br dissociation channel have greater internal excitation than the methyl fragments formed in the Br* dissociation channel. The results are compared with methyl iodide dissociation and the importance of surface crossings in the dissociation is discussed. C1 SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94551 USA. WILLIAMS COLL, THOMPSON CHEM LAB, DEPT CHEM, WILLIAMSTOWN, MA 01267 USA. RP HESS, WP (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 22 TC 48 Z9 49 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD JUN 15 PY 1992 VL 163 IS 2 BP 277 EP 286 DI 10.1016/0301-0104(92)87108-L PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JA039 UT WOS:A1992JA03900010 ER PT J AU STUMP, NA CHEN, G PETERSON, JR HAIRE, RG AF STUMP, NA CHEN, G PETERSON, JR HAIRE, RG TI EMISSION-SPECTRUM FROM EU-3+ IONS IN ANHYDROUS EUCL3 SO INORGANICA CHIMICA ACTA LA English DT Article ID EUROPIUM AB While the emission spectrum from Eu3+ ion doped into lanthanum trichloride has been thoroughly studied, that from pure EuCl3 has not been reported correctly. We have recorded the emission spectrum from anhydrous EuCl3 at 77 K with high resolution. As reported in the literature for other UCl3-type lanthanide trichlorides, the Eu3+ ion in EuCl3 exhibits an emission spectrum which is indicative of a D3/h site symmetry for the Eu3+ ion, even though X-ray diffraction data from EuCl3 support a Eu3+ ion site symmetry of C3h. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. NR 10 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD JUN 15 PY 1992 VL 196 IS 2 BP 209 EP 211 DI 10.1016/S0020-1693(00)86125-3 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JM158 UT WOS:A1992JM15800013 ER PT J AU KADISH, A AF KADISH, A TI PARAMETRIC ANALYSIS OF A SURFACE ELECTRICAL-DISCHARGE MODEL SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LUMPED-CIRCUIT MODEL; DIELECTRIC SURFACES AB A transmission line model for electric surface flashovers is analyzed. The model features an empirical scaling of resistance with current: The local resistance per unit length is taken to be inversely proportional to the magnitude of the local current. This scaling results in thresholds for discharge current onset and local abrupt termination of discharge current, as well as other observed properties of transient electrical discharges. The model predicts secondary current propagation: The current may terminate in a portion of the current channel and be restarted there at a later time. This results from the wave dynamics of voltage gradients in the channel. Conditions for current reversal and current termination are derived, and the dynamics of the free boundary between current-carrying and current-free regions of the current channel is studied. RP KADISH, A (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1992 VL 71 IS 12 BP 5806 EP 5819 DI 10.1063/1.350475 PG 14 WC Physics, Applied SC Physics GA HZ316 UT WOS:A1992HZ31600009 ER PT J AU NELSON, AJ FRIGO, S ROSENBERG, R AF NELSON, AJ FRIGO, S ROSENBERG, R TI SOFT-X-RAY PHOTOEMISSION CHARACTERIZATION OF THE H2S EXPOSED SURFACE OF PARA-INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDIUM-PHOSPHIDE; GAAS-SURFACES; SPECTROSCOPY; PASSIVATION; SULFUR AB Synchrotron radiation soft x-ray photoemission spectroscopy was used to characterize the surface chemistry of p-InP before and after exposure to H2S gas at ambient temperature. The effect of the H2S dosing was determined by in situ photoemission measurements which were acquired after each gas exposure in order to observe changes in the valence band electronic structure as well as changes in the In 4d, P 2p, and S2p core lines. The results were used to correlate the surface chemistry to the electronic properties. These measurements indicate that the H2S exposure type converts the p-type InP surface to an n-type surface and that the magnitude of the band bending is 0.6 eV resulting in a homojunction interface. C1 UNIV WISCONSIN,SYNCHROTRON RADIAT CTR,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LABS,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Rosenberg, Richard/K-3442-2012 NR 20 TC 22 Z9 22 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 JUN 15 PY 1992 VL 71 IS 12 BP 6086 EP 6089 DI 10.1063/1.350415 PG 4 WC Physics, Applied SC Physics GA HZ316 UT WOS:A1992HZ31600052 ER PT J AU DUNLAP, DH DUNCAN, RV AF DUNLAP, DH DUNCAN, RV TI LIMITS TO THE FUNDAMENTAL MEASUREMENT ACCURACY IN JOSEPHSON JUNCTION ARRAY VOLTAGE INTERCOMPARISONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SERIES-ARRAY; PHASE LOCK; STANDARDS; STABILITY AB The dc voltage output from a hysteretic Josephson junction which is locked to an ac frequency source differs from the ideal Josephson relation if the junction drives a current about a closed superconducting circuit. The difference in voltage-DELTA-V from two hysteretic Josephson junctions driven in series opposition is proportional to the difference in their driving frequencies-DELTA-omega if the junctions are each biased to the nth voltage step. It is shown here, however, that DELTA-V is systematically smaller than the voltage difference-DELTA-V0 predicted by the ideal junction relation DELTA-V0=(nHBAR/2e)DELTA-omega. If the loop inductance approaches zero, the smallest detectable voltage difference DELTA-V0 between two junctions is limited by the intrinsic Josephson inductance. For arrays of more than one junction, however, DELTA-V0 remains proportional to the loop inductance. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP DUNLAP, DH (reprint author), UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1992 VL 71 IS 12 BP 6177 EP 6181 DI 10.1063/1.350427 PG 5 WC Physics, Applied SC Physics GA HZ316 UT WOS:A1992HZ31600065 ER PT J AU CARNALL, WT AF CARNALL, WT TI A SYSTEMATIC ANALYSIS OF THE SPECTRA OF TRIVALENT ACTINIDE CHLORIDES IN D3H SITE SYMMETRY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CRYSTAL AB The optical spectra of actinide ions in the compound AnCl3 and doped into single-crystal LaCl3 were interpreted in terms of transitions within 5f(N) configurations. Energy-level calculations were carried out using an effective-operator Hamiltonian, the parameters of which were determined by fitting experimental data. Atomic and crystal-field matrices were diagonalized simultaneously assuming an approximate D3h site symmetry. Spectroscopic data were taken from the literature but in most cases supplemented by unpublished measurements in absorption and in fluorescence. Data for each ion were analyzed independently, then the model parameters were intercompared and in many cases adjusted such that in the final fitting process the principal interactions showed uniform trends in parameter values with increasing atomic number. Consistent with analyses of the spectra of lanthanide ions in both LaCl3 and LaF3, abrupt changes in magnitude of certain crystal-field parameters were found near the center of the 5f(N) series. This resulted in two groups of parameter values, but with consistent trends for both halves of the series, and generally very good agreement between observed and computed energies. A new energy-level chart based on computed crystal-field level energies for each trivalent actinide ion has been prepared. RP CARNALL, WT (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 44 TC 82 Z9 82 U1 2 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1992 VL 96 IS 12 BP 8713 EP 8726 DI 10.1063/1.462278 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ098 UT WOS:A1992HZ09800007 ER PT J AU CURTISS, LA CARPENTER, JE RAGHAVACHARI, K POPLE, JA AF CURTISS, LA CARPENTER, JE RAGHAVACHARI, K POPLE, JA TI VALIDITY OF ADDITIVITY APPROXIMATIONS USED IN GAUSSIAN-2 THEORY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-ENERGIES AB Three additivity approximations used in GAUSSIAN-2 (G2) theory to compute effective QCISD (T)/6-31 1 + G(3df,2p) energies for molecular systems are investigated by carrying out full QCISD(T)/6-311 + G(3df,2p) calculations on the set of 125 systems used for validation [J. Chem. Phys. 94, 7221 (1991 )]. The results indicate that the approximations work very well. The average absolute deviation of the full results from experiment is 1. 17 kcal/mol which is close to that of G2 theory (1.21 kcal/mol). The average absolute deviation with G2 theory is only 0.30 kcal/mol. However, the cpu cost increases by a factor of 2-3. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. CRAY RES INC,EAGAN,MN 55121. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 10 TC 244 Z9 245 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1992 VL 96 IS 12 BP 9030 EP 9034 DI 10.1063/1.462261 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ098 UT WOS:A1992HZ09800041 ER PT J AU EASTMAN, MA GRANDINETTI, PJ LEE, YK PINES, A AF EASTMAN, MA GRANDINETTI, PJ LEE, YK PINES, A TI DOUBLE-TUNED HOPPING-COIL PROBE FOR DYNAMIC-ANGLE-SPINNING NMR SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article ID SOLIDS; NUCLEI; AXIS C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP EASTMAN, MA (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Grandinetti, Philip/F-1084-2010 OI Grandinetti, Philip/0000-0003-0102-316X NR 13 TC 32 Z9 32 U1 2 U2 8 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2364 J9 J MAGN RESON JI J. Magn. Reson. PD JUN 15 PY 1992 VL 98 IS 2 BP 333 EP 341 DI 10.1016/0022-2364(92)90136-U PG 9 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA HZ623 UT WOS:A1992HZ62300008 ER PT J AU BURLEY, JD JOHNSTON, HS AF BURLEY, JD JOHNSTON, HS TI PHOTOABSORPTION CROSS-SECTIONS OF (FSO3)2 AND FSO3 SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article ID SPECTRUM; EXCITATION AB Photoabsorption cross-sections are measured for peroxydisulfuryl difluoride (FSO3)2 and the fluorosulfate radical FSO3. For (FSO3)2, the cross-sections measured at 298 K decline smoothly from 7.43 x 10(-18) cm2 at 180 nm to 1.27 x 10(-21) cm2 at 340 nm. At wavelengths between 340 and 450 nm, temperature-dependent measurements yield both dimer and radical cross-sections. For this second set of data, calculated cross-sections depend strongly on the choice of K(eq) for the dimer-radical equilibrium. If the results are analyzed with the K(eq) value determined by Dudley and Cady (J. Am. Chem. Soc., 85 (1963) 3375), dimer cross-sections decline smoothly from 1.21 x 10(-21) cm2 at 340 nm to 5.42 x 10(-23) cm2 at 430 nm and then increase slightly to 9.31 x 10(-23) cm2 at 450 nm. For FSO3, the cross-sections increase from 5.51 x 10(-19) cm2 at 340 nm to 4.21 x 10(-18) cm2 at 450 nm. If the results are calculated with the K(eq) value obtained by Cobos et al. (J. Phys. Chem., 93 (1989) 3089), the dimer cross-sections decline smoothly from 1.21 x 10(-21) cm2 at 340 nm to 6.54 x 10(-23) cm2 at 430 nm and then increase slightly to 1.08 x 10(-22) cm2 at 450 nm. Radical cross-sections increase from 4.30 x 10(-19) cm2 at 340 nm to 3.29 x 10(-18) cm2 at 450 nm. The present results are in reasonable agreement with the previous sigma (FSO3) measurements of Croce (J. Photochem. Photobiol. A: Chem., 51 (1990) 293) and Cobos et al., but disagree markedly with the measurement of Cobos et al. at 450 nm. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP BURLEY, JD (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 18 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD JUN 15 PY 1992 VL 66 IS 2 BP 141 EP 151 DI 10.1016/1010-6030(92)85208-C PG 11 WC Chemistry, Physical SC Chemistry GA JA981 UT WOS:A1992JA98100002 ER PT J AU ABRAHAM, MM BAKER, JM BLEANEY, B PFEFFER, JZ WELLS, MR AF ABRAHAM, MM BAKER, JM BLEANEY, B PFEFFER, JZ WELLS, MR TI ANTIFERROMAGNETIC-RESONANCE IN GDVO4 SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article AB Antiferromagnetic resonance has been observed in single crystals of gadolinium vanadate at frequencies of 0.035, 17, 24 and 34 GHz. At 1.36 K the frequency at zero applied magnetic field is 30.61(2) GHz, and its variation when a field is applied along the c-axis is compared with the predictions of mean field theory. A detailed comparison with a range of magnetic measurements on this model compound shows that overall agreement with mean field theory can only be obtained within about 10%. The variation of the field for resonance has also been determined at a range of angles including 90-degrees from the c-axis. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ABRAHAM, MM (reprint author), UNIV OXFORD,CLARENDON LAB,OXFORD,ENGLAND. NR 7 TC 7 Z9 7 U1 1 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 15 PY 1992 VL 4 IS 24 BP 5443 EP 5446 DI 10.1088/0953-8984/4/24/014 PG 4 WC Physics, Condensed Matter SC Physics GA HZ140 UT WOS:A1992HZ14000014 ER PT J AU BAXTER, AM KHOO, TL BLEICH, ME CARPENTER, MP AHMAD, I JANSSENS, RVF MOORE, EF BEARDEN, IG BEENE, JR LEE, IY AF BAXTER, AM KHOO, TL BLEICH, ME CARPENTER, MP AHMAD, I JANSSENS, RVF MOORE, EF BEARDEN, IG BEENE, JR LEE, IY TI COMPTON-SUPPRESSION TESTS ON GE AND BGO PROTOTYPE DETECTORS FOR GAMMASPHERE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Measurements are described of the Compton suppression of two prototype detectors for GAMMASPHERE. The prototypes consist of a large (75% efficient) n-type germanium detector with a BGO Compton-suppression shield. A peak-to-total ratio of 0.678(2) is achieved with a Co-60 source. This is the best ratio reported to date for a detector of this kind. The results are compared with those obtained from Monte Carlo simulations. The simulations can predict the observed peak-to-total ratios if a significant background from scattered photons is included. C1 PURDUE UNIV,W LAFAYETTE,IN 47907. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BAXTER, AM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 4 TC 32 Z9 34 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 101 EP 110 DI 10.1016/0168-9002(92)90597-W PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700009 ER PT J AU HARTOUNI, EP JENSEN, DA KLIMA, B KREISLER, MN LEE, S MARKIANOS, K NORDBERG, M RABIN, MSZ URIBE, J WESSON, D CHURCH, M GARA, A GOTTSCHALK, E HYLTON, R KNAPP, BC SIPPACH, W STERN, B WIENCKE, L CHRISTIAN, D ETCHEGOYEN, MCB GUTIERREZ, G HOLMES, S STRAIT, J WEHMANN, A AVILEZ, C CORREA, W FELIX, J FLORES, H MORENO, G ROMERO, M SOSA, M FORBUSH, M HUSON, FR WHITE, JT WIGHTMAN, JA AF HARTOUNI, EP JENSEN, DA KLIMA, B KREISLER, MN LEE, S MARKIANOS, K NORDBERG, M RABIN, MSZ URIBE, J WESSON, D CHURCH, M GARA, A GOTTSCHALK, E HYLTON, R KNAPP, BC SIPPACH, W STERN, B WIENCKE, L CHRISTIAN, D ETCHEGOYEN, MCB GUTIERREZ, G HOLMES, S STRAIT, J WEHMANN, A AVILEZ, C CORREA, W FELIX, J FLORES, H MORENO, G ROMERO, M SOSA, M FORBUSH, M HUSON, FR WHITE, JT WIGHTMAN, JA TI HIGH-SPEED SIMULTANEOUS MEASUREMENT OF PULSE AREA AND TIME-OF-FLIGHT FOR PHOTOMULTIPLIER SIGNALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A modular system to provide high speed simultaneous measurements of pulse area and time-of-flight for photomultiplier signals is described. By requiring a minimum pulse size and a time-of-flight signal within a gate before recording either measurement, the system achieves several advantages over other techniques. In particular, since no time is wasted reading channels without useful information, readout speed is enhanced. The system permits accurate measurements at rates exceeding 10 MHz per channel and can be read out without excessive dead time at rates up to approximately 100 kHz. Data storage problems are also reduced. Both pulse area and time-of-flight are measured using 128 bins (7 bits). Costs are less than $40 US per channel. Other advantages and design features are discussed. C1 COLUMBIA UNIV,NEVIS LABS,NEW YORK,NY 10533. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CUANAJUATO,INST FIS,LEON,GUANAJUATO,MEXICO. TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843. RP HARTOUNI, EP (reprint author), UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,AMHERST,MA 01003, USA. OI Hartouni, Edward/0000-0001-9869-4351 NR 4 TC 9 Z9 9 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 161 EP 169 DI 10.1016/0168-9002(92)90605-4 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700017 ER PT J AU GREENWOOD, RC STRUTTMANN, DA WATTS, KD AF GREENWOOD, RC STRUTTMANN, DA WATTS, KD TI USE OF A TOTAL ABSORPTION GAMMA-RAY SPECTROMETER TO MEASURE GROUND-STATE BETA-BRANCHING INTENSITIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DECAY; CE-145 AB A method has been developed to measure ground-state beta--branching intensities with the total absorption gamma-ray spectrometer at the INEL ISOL facility. This spectrometer, which is used to measure beta-feeding (or beta-strength) distributions to excited states in neutron-rich fission-product nuclei, consists of a 25.4 cm diameter x 30.5 cm long well-type NaI(Tl) scintillation detector together with a Si beta- detector located in the collection-tape transport line in the well. With this spectrometer operating in the beta-gamma coincidence mode as a 4-pi-gamma-beta detector, ground-state beta--branching intensities are obtained from simple ratios of beta-gamma coincidence to beta-singles count rates together with additional, generally small, correction terms. Results obtained for Rh-106, Cs-138-141, Ba-141-142, La-142-145 and Ce-145 are presented and compared with existing data obtained with conventional nuclear spectroscopic methods. RP GREENWOOD, RC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 35 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 175 EP 184 DI 10.1016/0168-9002(92)90607-6 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700019 ER PT J AU BAO, XJ SCHLESINGER, TE JAMES, RB HARVEY, SJ CHENG, AY GERRISH, V ORTALE, C AF BAO, XJ SCHLESINGER, TE JAMES, RB HARVEY, SJ CHENG, AY GERRISH, V ORTALE, C TI CORRELATIONS BETWEEN MERCURIC IODIDE PHOTOLUMINESCENCE SPECTRA AND NUCLEAR-DETECTOR PERFORMANCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID TEMPERATURE OSCILLATION; HGI2; SPECTROSCOPY; GROWTH; LUMINESCENCE; RESOLUTION; CRYSTALS; DEFECTS; SEARCH AB Low temperature photoluminescence spectroscopy was performed on a variety of HgI2 samples and also on graded HgI2 nuclear detectors. Correlations were found between features in the photoluminescence spectra and a crystal's ability to produce high-quality detectors. The intensity of a broad emission band centered at 6200 angstrom (designated as band 3) is weaker in crystals that yield high-quality detectors. Therefore, the defects responsible for this emission band are undesirable in the fabrication of HgI2 nuclear detectors. The measurements also revealed that stronger emission in the exciton region (designated as band 1) is associated with crystals which Produce high-quality detectors, indicating that a high degree of structural perfection is important for HgI2 detector applications. These correlations, together with. earlier results from studies of processing-induced defects, lead to suggestions regarding improvement of the manufacturing yield of high-quality HgI2 detectors. C1 SANDIA NATL LABS,DIV ADV MAT RES,LIVERMORE,CA 94550. EG&G ENERGY MEASUREMENTS INC,GOLETA,CA 93116. RP BAO, XJ (reprint author), CARNEGIE MELLON UNIV,DEPT ELECT & COMP ENGN,PITTSBURGH,PA 15213, USA. NR 34 TC 17 Z9 17 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 194 EP 201 DI 10.1016/0168-9002(92)90609-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700021 ER PT J AU KREEK, SA NURMIA, MJ KADKHODAYAN, B GREGORICH, KE LEE, DM HOFFMAN, DC HALL, HL PALMER, CEA BAISDEN, PA HENDERSON, RA AF KREEK, SA NURMIA, MJ KADKHODAYAN, B GREGORICH, KE LEE, DM HOFFMAN, DC HALL, HL PALMER, CEA BAISDEN, PA HENDERSON, RA TI AN AUTOMATED, ONLINE RAPID CHEMISTRY SYSTEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have developed an automated chromatographic chemical element separation system (ACCESS) and an automated injection system (AIS) for rapid and reproducible ion-exchange separations of various chemical species. The system is modular to allow for many different separation configurations. Two high precision chromatography pumps, LDCs, provide constant solvent pressure throughout the system. An additional pump, and a six-way valve, permit the use of a total of up to eight different eluants in succession. The system is controlled by an IBM PC running a BASIC program. Chemical yield with the system has been determined to be 80+/-9%. C1 LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550. EG&G ROCKY FLATS INC,GOLDEN,CO 80402. RP KREEK, SA (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,MAIL STOP 70A-3307,BERKELEY,CA 94720, USA. OI Hall, Howard/0000-0002-4080-5159 NR 7 TC 2 Z9 2 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 251 EP 253 DI 10.1016/0168-9002(92)90615-B PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700027 ER PT J AU KADKHODAYAN, B TURLER, A GREGORICH, KE NURMIA, MJ LEE, DM HOFFMAN, DC AF KADKHODAYAN, B TURLER, A GREGORICH, KE NURMIA, MJ LEE, DM HOFFMAN, DC TI THE HEAVY ELEMENT VOLATILITY INSTRUMENT (HEVI) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have constructed the heavy element volatility instrument (HEVI), an on-line gas chromatography system which is used to continuously separate halides according to their volatility. Both gaseous HBr and HCl have been used as halogenating agents. The detailed design of the apparatus is described and some preliminary results are presented. The experimental results are compared with those from a Monte Carlo code simulation based on a microscopic model for gas thermochromatography in open columns with laminar flow of the carrier gas. There is good agreement between the experimental results and the simulation. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP KADKHODAYAN, B (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 13 TC 17 Z9 20 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 254 EP 261 DI 10.1016/0168-9002(92)90616-C PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700028 ER PT J AU LINDSEY, CS DENBY, B HAGGERTY, H JOHNS, K AF LINDSEY, CS DENBY, B HAGGERTY, H JOHNS, K TI REAL-TIME TRACK FINDING IN A DRIFT CHAMBER WITH A VLSI NEURAL NETWORK SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB In a test setup, a hardware neural network determined track parameters of charged particles traversing a drift chamber. Voltages proportional to the drift times in 6 cells of the 3-layer chamber were inputs to the Intel ETANN neural network chip which had been trained to give the slope and intercept of tracks. We compare network track parameters to those obtained from off-line track fits. To our knowledge this is the first on-line application of a VLSI neural network to a high energy physics detector. This test explored the potential of the chip and the practical problems of using it in a real world setting. We compare the chip performance to a neural network simulation on a conventional computer. We discuss possible applications of the chip in high energy physics detector triggers. C1 UNIV ARIZONA,DEPT ORAL PATHOL,TUCSON,AZ 85721. RP LINDSEY, CS (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 13 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 15 PY 1992 VL 317 IS 1-2 BP 346 EP 356 DI 10.1016/0168-9002(92)90628-H PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF397 UT WOS:A1992JF39700040 ER PT J AU ROBERTS, JP BENICEWICZ, PK TAYLOR, AJ AF ROBERTS, JP BENICEWICZ, PK TAYLOR, AJ TI SYNCHRONOUSLY PUMPED FEMTOSECOND DYE OSCILLATOR-AMPLIFIER SYSTEM AT 815-NM SO OPTICS COMMUNICATIONS LA English DT Article ID OPTICAL PULSES; AMPLIFICATION; GENERATION AB A tunable dye oscillator-amplifier system that produces 0.25 mJ, 105 fs pulses at 815 nm is demonstrated. The system consists of a synchronously pumped femtosecond dye laser followed by a dye amplifier that is quasi-longitudinally pumped using the frequency-doubled output from a Nd:YAG regenerative amplifier. C1 UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87106. RP ROBERTS, JP (reprint author), LOS ALAMOS NATL LAB,LASER SCI & APPLICAT GRP,CLS-5,MS E543,LOS ALAMOS,NM 87545, USA. NR 11 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD JUN 15 PY 1992 VL 90 IS 4-6 BP 287 EP 291 DI 10.1016/0030-4018(92)90278-Y PG 5 WC Optics SC Optics GA JB842 UT WOS:A1992JB84200021 ER PT J AU BAK, P FLYVBJERG, H AF BAK, P FLYVBJERG, H TI SELF-ORGANIZATION OF MAGNETIC DOMAIN PATTERNS SO PHYSICA A LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON COMPLEX SYSTEMS : FRACTALS, SPIN GLASSES AND NEURAL NETWORKS CY JUL 02-06, 1991 CL TRIESTE, ITALY SP INT CTR THEORET PHYS TRIESTE ID GARNET-FILMS; CRITICALITY AB We model the self-organizing dynamics of two-dimensional magnetic domain patterns with magnetic bubble traps. Avalanches of topological rearrangements and domain destruction are simulated numerically. AsYmptotic forms for distributions of avalanche sizes and lifetimes are found analytically. They are power laws with exponential damping factors. Experimental results are shown to obey these asymptotic forms, indicating that the experimentally observed self-organized state is sub-critical. C1 NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. RP BAK, P (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Flyvbjerg, Henrik/C-1127-2009 OI Flyvbjerg, Henrik/0000-0002-1691-9367 NR 10 TC 4 Z9 4 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD JUN 15 PY 1992 VL 185 IS 1-4 BP 3 EP 10 DI 10.1016/0378-4371(92)90431-O PG 8 WC Physics, Multidisciplinary SC Physics GA JC914 UT WOS:A1992JC91400002 ER PT J AU GIBSON, JF FARMER, JD CASDAGLI, M EUBANK, S AF GIBSON, JF FARMER, JD CASDAGLI, M EUBANK, S TI AN ANALYTIC APPROACH TO PRACTICAL STATE-SPACE RECONSTRUCTION SO PHYSICA D LA English DT Article ID TIME-SERIES; ATTRACTORS; SYSTEM AB We study the three standard methods for reconstructing a state space from a time series: delays, derivatives, and principal components. We derive a closed-form solution to principal component analysis in the limit of small window widths. This solution explains the relationship between delays, derivatives, and principal components, it shows how the singular spectrum scales with dimension and delay time, and it explains why the eigenvectors resemble the Legendre polynomials. Most importantly, the solution allows us to derive a guideline for choosing a good window width. Unlike previous suggestions, this guideline is based on first principles and simple quantities. We argue that discrete Legendre polynomials provide a quick and not-so-dirty substitute for principal component analysis, and that they are a good practical method for state space reconstruction. C1 SANTA FE INST,SANTA FE,NM 87501. LOS ALAMOS NATL LAB,COMPLEX SYST GRP,LOS ALAMOS,NM 87545. RI Eubank, Stephen/D-7497-2011 OI Eubank, Stephen/0000-0002-7177-309X NR 17 TC 119 Z9 127 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 15 PY 1992 VL 57 IS 1-2 BP 1 EP 30 DI 10.1016/0167-2789(92)90085-2 PG 30 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA JD721 UT WOS:A1992JD72100001 ER PT J AU WAGNER, NJ HOLIAN, BL VOTER, AF AF WAGNER, NJ HOLIAN, BL VOTER, AF TI MOLECULAR-DYNAMICS SIMULATIONS OF 2-DIMENSIONAL MATERIALS AT HIGH-STRAIN RATES SO PHYSICAL REVIEW A LA English DT Article AB The mechanical behavior of model two-dimensional materials is investigated by large-scale molecular-dynamics (MD) simulations on a massively parallel computer. Both a pair-potential and a model embedded-atom many-body potential are examined. A parallel MD algorithm is developed to exploit the architecture of the Connection Machine, enabling simulations of greater than 10(6) atoms. Adiabatic expansions and spallation experiments on both perfect crystals and granular solids are performed. It is demonstrated that a uniform adiabatic expansion is a good model for the spallation process. The spall strength is shown to be proportional to the logarithm of the applied strain rate. A dislocation-dynamics model is developed to explain the results, which also leads to predictions for the impact spallation experiments. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Wagner, Norman/B-6558-2012; OI Wagner, Norman/0000-0001-9565-619X; Voter, Arthur/0000-0001-9788-7194 NR 16 TC 63 Z9 65 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 15 PY 1992 VL 45 IS 12 BP 8457 EP 8470 DI 10.1103/PhysRevA.45.8457 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JA214 UT WOS:A1992JA21400024 ER PT J AU YOUNGER, SM AF YOUNGER, SM TI MANY-ATOM SCREENING EFFECTS ON DIFFUSION IN DENSE HELIUM SO PHYSICAL REVIEW A LA English DT Article AB The structure and dynamics of helium at 5 eV over the density range 1.5 less-than-or-equal-to rho less-than-or-equal-to 8 g/cm3 were studied using self-consistent-field molecular dynamics. Representative results for the pair-correlation function, velocity autocorrelation function, and the average charge density surrounding an atom are presented. Many-atom screening is found to have an important effect on all of these quantities above 0.3 g/cm3. Above 2 g/cm3, screening effects appear to saturate, and the coefficient of diffusion tends to the limit of a one-component plasma. RP YOUNGER, SM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 18 TC 8 Z9 8 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 15 PY 1992 VL 45 IS 12 BP 8657 EP 8665 DI 10.1103/PhysRevA.45.8657 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JA214 UT WOS:A1992JA21400045 ER PT J AU JAMES, RA GIRUZZI, G DEGENTILE, B RODRIGUEZ, L HARVEY, R LOHR, J LUCE, TC MATSUDA, K MOELLER, CP PRATER, R SNIDER, R FYAKHRETDINOV, A GORELOV, Y TRUKHIN, V JANZ, S AF JAMES, RA GIRUZZI, G DEGENTILE, B RODRIGUEZ, L HARVEY, R LOHR, J LUCE, TC MATSUDA, K MOELLER, CP PRATER, R SNIDER, R FYAKHRETDINOV, A GORELOV, Y TRUKHIN, V JANZ, S TI ELECTRON-CYCLOTRON-CURRENT-DRIVE EXPERIMENTS IN THE DIII-D TOKAMAK SO PHYSICAL REVIEW A LA English DT Article ID PLASMA; WAVES AB Electron-cyclotron-current-drive (ECCD) experiments performed in the DIII-D tokamak have produced rf-driven currents of up to 100 kA. The experimental results, which exceed predictions using linear theory, are enhanced by the presence of a residual, toroidal de electric field. These ECCD experiments are performed with plasma conditions sufficient to result in strong localized deposition of the rf power and good confinement of the rf-generated current carriers. These improved conditions permit a test of theory under reactor relevant conditions. Theoretical predictions obtained using a Fokker-Planck code are in good agreement with the experimental results when effects due to electron trapping and the residual dc electric field are included. C1 CEN CADARACHE,CEA,ASSOC EURATOM,F-13115 ST PAUL DURANCE,FRANCE. GEN ATOM CO,SAN DIEGO,CA 92186. IV KURCHATOV ATOM ENERGY INST,MOSCOW,USSR. UNIV MARYLAND,COLLEGE PK,MD 20742. RP JAMES, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 18 TC 40 Z9 41 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 15 PY 1992 VL 45 IS 12 BP 8783 EP 8786 DI 10.1103/PhysRevA.45.8783 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JA214 UT WOS:A1992JA21400056 ER PT J AU DONOHOE, RJ WORL, LA ARRINGTON, CA BULOU, A SWANSON, BI AF DONOHOE, RJ WORL, LA ARRINGTON, CA BULOU, A SWANSON, BI TI PHOTOINDUCED DEFECTS IN THE BROMIDE-BRIDGED PLATINUM LINEAR-CHAIN [PT(EN)2][PT(EN)2BR2](CLO4)4 (WITH EN=ETHYLENEDIAMINE) SO PHYSICAL REVIEW B LA English DT Article ID MIXED-VALENCE PLATINUM; NONLINEAR LATTICE-RELAXATION; CHARGE-TRANSFER EXCITATION; OPTICAL-PROPERTIES; POLARONIC STATES; METAL-COMPLEXES; BAND; ABSORPTION; CRYSTALS; 4 AB Photoinduced defects in the bromide-bridged platinum linear chain [Pt(en)2][Pt(en)2Br2](ClO4)4 (PtBr, where en=ethylenediamine) yield Raman, absorption, and electron paramagnetic resonance (EPR) signals that have been examined as a function of temperature in order to determine the kinetics of the decay of these metastable defects in an intermediate-strength low-dimensional charge-density-wave (CDW) solid. Both diamagnetic and paramagnetic defects are photogenerated with the initial excitonic transient primarily decaying to form electron bipolarons and hole polarons. The photogenerated Raman signal is indicative of the former and the EPR signal of the latter. The type and stability of these photoinduced defects are dependent on the sample history, with PtBr crystals grown in the orthorhombic phase (above 30-degrees-C) leading to greater variety and stability of defects as compared with those photoinduced in crystals grown in the monoclinic phase (below 10-degrees-C). The temperature dependence of the photogenerated spectroscopic signals reveals complicated decay routes, with the eventual recombination of valence defects mediated by lattice pinning potentials of various strengths, interconversion of defect states (including the possible "melting" of electron bipolarons into electron polarons) and a strengthening of the CDW as the crystals are warmed toward room temperature. The observation of bromide hyperfine splitting in the EPR data and the reversible intensity changes in the Raman defect signals indicates that these defects are spatially quite disperse, with ten or greater platinum sites revealed in the EPR signal, and demonstrates that the weakening of the CDW in PtBr relative to the strong CDW solid PtCl has a significant effect on the ground- and defect-state properties. C1 FURMAN UNIV,GREENVILLE,SC 29613. UNIV MAINE,FAC SCI,PHYS ETAT CONDENSE LAB,F-72017 LE MANS,FRANCE. RP DONOHOE, RJ (reprint author), LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,INC-4,MS-C345,LOS ALAMOS,NM 87545, USA. NR 52 TC 38 Z9 38 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13185 EP 13195 DI 10.1103/PhysRevB.45.13185 PG 11 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500001 ER PT J AU COX, LE WARD, JW HAIRE, RG AF COX, LE WARD, JW HAIRE, RG TI X-RAY-PHOTOEMISSION-SPECTROSCOPY STUDY OF THE ELECTRONIC-STRUCTURE OF AM METAL AND AMHX (FOR X-SIMILAR-OR-EQUAL-TO-2) SO PHYSICAL REVIEW B LA English DT Article ID LOCALIZATION; AMERICIUM AB In order to test the proposal that the anomalous valence-level photemission spectrum of Am results from a divalent (5f7) surface layer, we have performed variable-takeoff-angle experiments on the metal. 4f spectra obtained at 10-degrees and 85-degrees off normal showed no significant difference in the intensity of the 5f7 (i.e., f-screened) satellite, which is not consistent with an electronically altered surface. Core and valence spectra of a hydrided sample were also obtained for comparison. Pronounced differences in the 5f-derived multiplet manifold were evident, and suggest that alternate screening channels are responsible for the additional features in the metal spectrum. Differences in the metal and hydride 4f peak shapes and satellite intensities are discussed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP COX, LE (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 23 TC 13 Z9 13 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13239 EP 13243 DI 10.1103/PhysRevB.45.13239 PG 5 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500005 ER PT J AU STEINER, MM ALBERS, RC SHAM, LJ AF STEINER, MM ALBERS, RC SHAM, LJ TI QUASI-PARTICLE PROPERTIES OF FE, CO, AND NI SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METALS; SELF-ENERGY; COULOMB-INTERACTION; ANDERSON MODEL; PERTURBATION TREATMENT; ELECTRONIC-PROPERTIES; FERROMAGNETIC IRON; BAND-STRUCTURE; FERMI-SURFACE; AUGER-SPECTRA AB For narrow electronic bands in metals, we seek improvement over the local-density approximation (LDA) by including the on-site Coulomb interaction between localized electrons. For the 3d ferromagnetic series of Fe, Co, and Ni, by treating fluctuations to second order in the on-site interaction around the LDA solution, in comparison with experiment a distinct improvement over the conventional LDA is obtained for a number of properties: effective masses, x-ray photoemission spectra, and results derived from angle-resolved photoemission spectra, such as exchange splittings and quasiparticle bands. In addition, the predicted quasiparticle broadenings and satellite features, which are not present in standard LDA calculations, are in reasonable agreement with observation. C1 UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RP LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. OI Sham, Lu/0000-0001-5718-2077 NR 69 TC 111 Z9 111 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13272 EP 13284 DI 10.1103/PhysRevB.45.13272 PG 13 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500010 ER PT J AU HEYMAN, JN AGER, JW HALLER, EE JOHNSON, NM WALKER, J DOLAND, CM AF HEYMAN, JN AGER, JW HALLER, EE JOHNSON, NM WALKER, J DOLAND, CM TI HYDROGEN-INDUCED PLATELETS IN SILICON - INFRARED-ABSORPTION AND RAMAN-SCATTERING SO PHYSICAL REVIEW B LA English DT Article ID A-SI-H AB The local vibrational modes of hydrogen-induced platelets in crystalline silicon have been studied using infrared absorption and Raman-scattering spectroscopy. Four overlapping but distinct bands are observed in the region 2000-2200 cm-1. Hydrogen-isotope substitution confirms that these are hydrogen-related stretching vibrations. Hydrogen concentrations obtained from the integrated infrared band intensities are comparable to total hydrogen concentrations obtained from secondary-ion mass spectroscopy. Relative intensities of the bands depend on sample history and can be varied by annealing. This indicates that the four bands arise from at least three distinct structures. Polarization-sensitive Raman measurements indicate that the Raman-active local modes transform according to the fully symmetric representation of a trigonal point group. One structure possesses distinct ir and Raman-active local modes. We conclude that the platelets are highly ordered structures with fundamental building blocks consisting of silicon atoms with one hydrogen-saturated bond, and that at least one inversion-symmetric structure exists. We compare our results with previously proposed structures. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. XEROX CORP, PALO ALTO RES CTR, PALO ALTO, CA 94304 USA. RP HEYMAN, JN (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. OI Ager, Joel/0000-0001-9334-9751 NR 12 TC 66 Z9 66 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13363 EP 13366 DI 10.1103/PhysRevB.45.13363 PG 4 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500021 ER PT J AU LANGFORD, AA FLEET, ML NELSON, BP LANFORD, WA MALEY, N AF LANGFORD, AA FLEET, ML NELSON, BP LANFORD, WA MALEY, N TI INFRARED-ABSORPTION STRENGTH AND HYDROGEN CONTENT OF HYDROGENATED AMORPHOUS-SILICON SO PHYSICAL REVIEW B LA English DT Article ID A-SI-H; X-RAY-SCATTERING; VIBRATIONAL-SPECTRA; GLOW-DISCHARGE; THIN-FILM; ELECTRONIC-PROPERTIES; OPTICAL-PROPERTIES; NUCLEAR-REACTION; GERMANIUM; MICROVOIDS AB We have used infrared transmission and nuclear-reaction analysis to determine the ir absorption strength of the Si-H wagging and stretching modes in hydrogenated amorphous silicon (a-Si:H). The films were deposited by plasma-assisted chemical vapor deposition and reactive magnetron sputtering. We show that the widely used ir-data-analysis method of Brodsky, Cardona, and Cuomo can lead to significant errors in determining the absorption coefficients, particularly for films less than approximately 1-mu-m thick. To eliminate these errors we explicitly take into account the effects of optical interference to analyze our data. We show that the hydrogen content can be determined from the stretching modes at omega=2000 and 2100 cm-1 as well as the wagging mode at omega=640 cm-1. By assigning different oscillator strengths to the 2000- and 2100-cm-1 modes, we show that the absorption strength of the stretching modes does not depend on the details of sample preparation, contrary to hypotheses previously invoked to explain experimental data. We obtain A640=(2.1+/-0.2)X10(19) cm-2, A2000=(9.0+/-1.0)X10(19) cm-2, and A2100=(2.2+/-0.2)X10(20) cm-2 for the proportionality constants between the hydrogen concentration and the integrated absorbance of the wagging and stretching modes. The value of A640 is approximately 30% larger than the generally used value. We show that previously published data for both the wagging and stretching modes are consistent with the proportionality factors determined in the present study. C1 SUNY ALBANY,DEPT PHYS,ALBANY,NY 12222. UNIV ILLINOIS,COORDINATED SCI LAB,URBANA,IL 61801. RP LANGFORD, AA (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 51 TC 419 Z9 432 U1 4 U2 59 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13367 EP 13377 DI 10.1103/PhysRevB.45.13367 PG 11 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500022 ER PT J AU CHANG, S VITOMIROV, IM BRILLSON, LJ MAILHIOT, C RIOUX, DF KIME, YJ KIRCHNER, PD PETTIT, GD WOODALL, JM AF CHANG, S VITOMIROV, IM BRILLSON, LJ MAILHIOT, C RIOUX, DF KIME, YJ KIRCHNER, PD PETTIT, GD WOODALL, JM TI CHEMICAL AND ELECTRONIC-PROPERTIES OF AL/[VICINAL GAAS(100)] AND AU/[VICINAL GAAS(100)] INTERFACE SO PHYSICAL REVIEW B LA English DT Article ID SCHOTTKY-BARRIER FORMATION; MOLECULAR-BEAM EPITAXY; UNIFIED DEFECT MODEL; FERMI-LEVEL MOVEMENT; GAAS 001; CRYSTALLOGRAPHIC RELATIONSHIPS; SEMICONDUCTOR SURFACES; AL/GAAS(001) INTERFACE; GAAS(001) SURFACES; METAL CONTACTS AB Soft-x-ray photoemission studies of Al and Au on molecular-beam epitaxially grown GaAs(100) vicinal surfaces at low temperature demonstrate orientation-dependent interface electronic properties and chemistry. Misorientation of the substrate introduces both electrically and chemically active sites. With increasing misorientation-induced step-site density, the Fermi level at the Al/GaAs(100) interface moves toward the midgap. For the Au/GaAs(100) interface, substrate misorientation has only a minor effect on the electronic barrier height. The chemically active sites modify the extent of interface chemistry. A self-consistent electrostatic calculation of the misorientation-dependent barrier height for Al interfaces indicates a nearly one-to-one correlation between interface states and step-induced bonding sites. These results emphasize the importance of an atomic-scale interface bonding structure in the Schottky-barrier formation. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP CHANG, S (reprint author), XEROX WEBSTER RES CTR,900 PHILLIPS RD,WEBSTER,NY 14580, USA. RI Schaff, William/B-5839-2009 NR 79 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13438 EP 13451 DI 10.1103/PhysRevB.45.13438 PG 14 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500032 ER PT J AU TYCKO, R DABBAGH, G KURTZ, SR GORAL, JP AF TYCKO, R DABBAGH, G KURTZ, SR GORAL, JP TI QUANTITATIVE STUDY OF ATOMIC ORDERING IN GA0.5IN0.5P THIN-FILMS BY P-31 NUCLEAR-MAGNETIC-RESONANCE SO PHYSICAL REVIEW B LA English DT Article ID VAPOR-PHASE EPITAXY; ALLOY SEMICONDUCTORS; BAND-GAP; GAINP; ELECTROREFLECTANCE; INGAP; NMR AB We use P-31 nuclear-magnetic-resonance (NMR) spectra to measure the degree of cation ordering in thin films of the semiconductor alloy Ga0.5In0.5P grown by organometallic vapor-phase epitaxy. We show that the five possible GanIn4-nP clusters in GaxIn1-xP give rise to resolved NMR lines under magic-angle spinning, allowing a determination of the degree of cation ordering from the relative areas of the five lines. The ordering is shown to be weak (order parameter less-than-or-equal-to 0.6) even in films that appear highly ordered in transmission electron microscopy. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP TYCKO, R (reprint author), AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. NR 25 TC 30 Z9 30 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13452 EP 13458 DI 10.1103/PhysRevB.45.13452 PG 7 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500033 ER PT J AU VONWITTENAU, AES HUSSAIN, Z WANG, LQ HUANG, ZQ JI, ZG SHIRLEY, DA AF VONWITTENAU, AES HUSSAIN, Z WANG, LQ HUANG, ZQ JI, ZG SHIRLEY, DA TI REEVALUATION OF THE P(2X2)S/CU(001) STRUCTURE USING ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE-STRUCTURE SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID CU(100)-(2X2)-S SURFACE-STRUCTURE; ENERGY ELECTRON-DIFFRACTION; CRYSTALLOGRAPHIC ANALYSIS; SCATTERING; CU(001); COPPER AB We have performed low-temperature (110-160 K) angle-resolved photoemission extended-fine-structure studies of p(2X2)S/Cu(001). Analysis based on multiple-scattering spherical-wave calculations indicates that S adsorbs into a fourfold hollow site 1.32 angstrom above the Cu surface, with near-surface reconstruction of the Cu layers in general similar to recent low-energy-electron-diffraction and medium-energy-ion scattering results, removing an earlier discrepancy. The S-Cu bond length is determined to be 2.26 angstrom. The second-layer Cu(001) plane appears to be corrugated more than indicated by the other methods. Additional reconstruction may be present in this system. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP VONWITTENAU, AES (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 34 TC 31 Z9 31 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13614 EP 13623 PG 10 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500054 ER PT J AU JENSEN, E BARTYNSKI, RA GARRETT, RF HULBERT, SL JOHNSON, ED KAO, CC AF JENSEN, E BARTYNSKI, RA GARRETT, RF HULBERT, SL JOHNSON, ED KAO, CC TI ORIGIN OF THE LOW-ENERGY TAIL IN THE AL L2,3VV AUGER SPECTRUM STUDIED WITH AUGER-PHOTOELECTRON COINCIDENCE SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID X-RAY PHOTOEMISSION; VALENCE-VALENCE PROCESSES; DEEP-HOLE EXCITATIONS; LINE-SHAPES; BAND-STRUCTURE; SIMPLE METALS; KLV AUGER; ALUMINUM; SURFACE; SOLIDS AB Al L2,3VV auger-photoelectron coincidence (APEC) data are presented and discussed. The well-known ability of APEC to suppress inelastic-scattering contributions to Auger and photoelectron spectra is used to demonstrate that much of the large low-energy tail common to core-valence-valence Auger spectra from many wide-band solids is not due to secondary-electron scattering, but, rather, is an intrinsic part of the core-hole-decay process. C1 RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP JENSEN, E (reprint author), BRANDEIS UNIV,DEPT PHYS,WALTHAM,MA 02254, USA. NR 47 TC 25 Z9 25 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13636 EP 13641 DI 10.1103/PhysRevB.45.13636 PG 6 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500057 ER PT J AU GUO, J ELLIS, DE LAM, DJ AF GUO, J ELLIS, DE LAM, DJ TI ELECTRONIC-STRUCTURE AND ENERGETICS OF SAPPHIRE (0001) AND (1102) SURFACES SO PHYSICAL REVIEW B LA English DT Article ID ALPHA-ALUMINA; DEFECT STRUCTURE; WUSTITE FE1-XO; ENERGY; DIFFRACTION; CRYSTAL AB Electronic structure and energetics of (0001) and (1102BAR) surfaces of sapphire, alpha-Al2O3, were calculated using the self-consistent-field discrete variational (DV) method in the local-density framework. Clusters of a size of 70-120 atoms embedded in the semi-infinite host lattice were used to model the sapphire free surfaces. Calculations were performed on all possible terminating (0001) and (1102BAR) surfaces obtained from cleaving a sapphire single crystal. The energetic calculations show that the surface with the lowest cleavage energy is terminated with an Al layer for the (0001) surface, while it is terminated with an O layer for the (1102BAR) surface. The concept of the surface building block, useful in determining the surface atomic termination, was proposed. Two unoccupied surface bands derived from the top-layer Al atoms are found within the bulk band gap at 2 and 8 eV below the conduction-band minimum (CBM) for the (0001) surface. For the (1102BAR) surface, the occupied valence states derived from 2p states of the top-layer 0 atoms are found approximately 4.0 eV below the CBM, which may explain the 4.7-eV energy-loss feature found experimentally on a sapphire (1102BAR) surface. RP GUO, J (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 39 TC 164 Z9 165 U1 4 U2 26 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13647 EP 13656 DI 10.1103/PhysRevB.45.13647 PG 10 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500059 ER PT J AU WEINERT, M DAVENPORT, JW AF WEINERT, M DAVENPORT, JW TI FRACTIONAL OCCUPATIONS AND DENSITY-FUNCTIONAL ENERGIES AND FORCES SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-DYNAMICS; METALS AB The explicit inclusion of fractional occupation numbers in density-functional calculations is shown to require an additional term to make the energy functional variational. The contribution from this term to the density-functional force exactly cancels the correction term depending on changes in the occupation number. For occupation numbers obeying a Fermi distribution, the resulting functional is identical in form to the grand potential; other choices for the form of the occupation numbers will result in different functionals. These terms, although numerically small, should be included in practical calculations that allow for fractional occupation numbers. RP WEINERT, M (reprint author), BROOKHAVEN NATL LAB, DEPT PHYS 510A, UPTON, NY 11973 USA. NR 21 TC 198 Z9 199 U1 3 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13709 EP 13712 DI 10.1103/PhysRevB.45.13709 PG 4 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500068 ER PT J AU CAO, R YANG, X TERRY, J PIANETTA, P AF CAO, R YANG, X TERRY, J PIANETTA, P TI CORE-LEVEL SHIFTS OF THE GE(100)-(2X1) SURFACE AND THEIR ORIGINS SO PHYSICAL REVIEW B LA English DT Note ID SYNCHROTRON PHOTOEMISSION; SI(100) SURFACES; DIMERS AB The surface shifts of the Ge 3d core level from the clean Ge(100)-(2x1) surface have been investigated using Si epitaxial layers grown with Sb as a surfactant. We are able to obtain a line shape close to that of the natural line shape of the Ge 3d and, in turn, we have resolved two surface-related components in the core-level spectrum of the clean surface, in contrast to previously observed single component. The origin of these shifts is addressed: one comes from the top layer and the other from the layer below the surface. A comparison with the Si(100)-(2x1) surface is also presented. RP STANFORD SYNCHROTRON RADIAT LAB, POB 4349, BIN 69, STANFORD, CA 94309 USA. NR 25 TC 32 Z9 32 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13749 EP 13752 DI 10.1103/PhysRevB.45.13749 PG 4 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500078 ER PT J AU TSUEI, KD JOHNSON, PD AF TSUEI, KD JOHNSON, PD TI CO ON CU(001) - AN INVERSE-PHOTOEMISSION STUDY SO PHYSICAL REVIEW B LA English DT Note ID ELECTRON-SCATTERING; METAL-SURFACES; CHEMISORBED CO; STATES; RESONANCE; MOLECULES; ENERGY; LEVEL AB Inverse photoemission is used to examine the adsorbate-induced unoccupied band structure of the c(2x2)CO/Cu(001) adsorption system. As in an earlier study we observe two adsorbate-induced peaks above the Fermi level. By comparing with a simple tight-binding model, we associate one unoccupied adsorbate band with the molecular 2-pi level and another band with a substrate surface band interacting with the molecular 5-sigma level. RP TSUEI, KD (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 25 TC 26 Z9 26 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13827 EP 13830 DI 10.1103/PhysRevB.45.13827 PG 4 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500098 ER PT J AU CHUNG, M WANG, YQ BRILL, JW XIANG, XD MOSTOVOY, R HOU, JG ZETTL, A AF CHUNG, M WANG, YQ BRILL, JW XIANG, XD MOSTOVOY, R HOU, JG ZETTL, A TI AC CALORIMETRY OF C-60 SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Note ID HEAT AB We have measured the (effective) specific heat of single crystals of C60 using ac calorimetry. For an fcc crystal prepared by sublimation, there is a sharp hysteretic lambda-shaped anomaly at 260 K, reflecting a latent heat spread over 3 K, similar to what is observed in powders using differential scanning calorimetry. There is also a discontinuity of 11.6R in the specific heat. For orthorhombic crystals prepared by slow evaporation from a toluene-hexane solution, a nonhysteretic, apparently second-order, transition is observed at 239 K. There is a peak in the specific heat consistent with a transition entropy of R ln12. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CHUNG, M (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. RI Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; NR 15 TC 16 Z9 16 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13831 EP 13833 DI 10.1103/PhysRevB.45.13831 PG 3 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500099 ER PT J AU WILLS, JM ERIKSSON, O AF WILLS, JM ERIKSSON, O TI CRYSTAL-STRUCTURE STABILITIES AND ELECTRONIC-STRUCTURE FOR THE LIGHT ACTINIDES TH, PA, AND U SO PHYSICAL REVIEW B LA English DT Article ID RELATIVISTIC CORRECTIONS; BULK PROPERTIES; ATOMIC VOLUMES; BRILLOUIN-ZONE; SPECIAL POINTS; TRANSITION; METALS; BAND; AMERICIUM; ELEMENTS AB The crystal-structure stabilities, equilibrium volumes, and bulk moduli (at T=O) of the light actinides Th, Pa, and U, have been calculated by means of full-potential, total-energy band-structure calculations. The total energies of the three elements were calculated as a function of volume in the three experimentally observed crystal structures: fcc, bct, and orthorhombic (alpha-U). Our calculations reproduce the experimentally observed crystal structures, as well as the equilibrium volumes and bulk moduli (the bulk modulus of Pa being an exception). Other calculated ground-state properties are also in good agreement with experiment, e.g., crystal-structure parameters (c/a ratio and positional parameters). On the basis of our results, we argue that the 5f electrons are participating in the chemical bonds, and that they have a large influence on the crystal structure. The equilibrium volumes of hypothetical fcc structures are found to show increasing deviations from the volumes obtained in the true crystal structures, as the 5f band becomes filled. Also, these fully relativistic calculations (assuming a fcc structure) show a smaller volume for Pu than for Np, in contrast to the experimental finding. We therefore propose that the anomalous volume of alpha-Pu is associated with its very unusual crystal structure, rather than with relativistic effects. Detailed information from the calculations is presented, such as the density of states, charge-density contour plots, and orbital occupation numbers. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WILLS, JM (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 37 TC 84 Z9 86 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 13879 EP 13890 DI 10.1103/PhysRevB.45.13879 PG 12 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200001 ER PT J AU LAKS, DB ZUNGER, A AF LAKS, DB ZUNGER, A TI THEORY OF INTERFACIAL STABILITY OF SEMICONDUCTOR SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID 1ST-PRINCIPLES CALCULATION; PHASE-DIAGRAMS; BAND OFFSETS; ALLOY AB With few exceptions, abrupt isovalent AC/BC semiconductor superlattices (SL's) were predicted previously to be globally unstable at T = 0 with respect to the random alloy. We examine the stability of these SL's with respect to local swaps of atoms near the interface, leading to interface-broadening reconstructions. For lattice-mismatched GaP/InP SL's, we find that reconstruction is most energetically favorable for SL's in the [111] and [011] directions, and somewhat less favorable for SL's in the (001] direction. These results are independent of period p for p > 3; for p < 3, reconstruction results in large energy gains (nearly 60% for p = 1 [111]) in the [001] and [111] directions, but reconstruction is unfavorable for short-period [011] and [201] SL's. For monolayer SL's, reconstruction is accompanied by a large increase in the electronic band gap. The stability of abrupt SL's with respect to reconstruction shows a strong dependence on the substrate lattice constant on which the SL is grown; SL's grown in a GaP substrate are the most stable, while those grown on InP are the least stable. For lattice-matched AlAs/GaAs SL's, small energy lowerings are found for some SL's with p less-than-or-equal-to 3, while no reconstructions are found for longer periods. RP LAKS, DB (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 26 TC 11 Z9 11 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14177 EP 14188 DI 10.1103/PhysRevB.45.14177 PG 12 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200040 ER PT J AU JIANG, QT GUSTAFSSON, T HABERLE, P ZEHNER, DM AF JIANG, QT GUSTAFSSON, T HABERLE, P ZEHNER, DM TI MISSING-ROW SURFACE RECONSTRUCTION OF AU(113) INDUCED BY ADSORBED CALCIUM ATOMS SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-ION-SCATTERING; SCANNING TUNNELING MICROSCOPY; METAL-SURFACES; RELAXATION; STABILITY; GOLD; AU; TRANSITION; POTENTIALS; COLLISIONS AB We report the structure of the (1 X 2) reconstruction induced by 0.1 monolayer of Ca atoms on the Au(113) surface, using medium-energy ion scattering. Our data show that the (1 X 2) surface corresponds to a missing-row-type reconstruction. Monte Carlo simulations of the experiment provide a quantitative measurement of the atomic positions at the surface. All the displacements in the surface region are such that the resulting structure smooths out the corrugation inherent in a missing-row reconstruction. We discuss the relation between this reconstruction and the energy balance between competing surface-electronic-charge densities. C1 RUTGERS STATE UNIV, SURFACE MODIFICAT LAB, PISCATAWAY, NJ 08855 USA. UNIV TECN FEDERICO SANTA MARIA, DEPT FIS, VALPARAISO, CHILE. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP RUTGERS STATE UNIV, DEPT PHYS & ASTRON, POB 849, PISCATAWAY, NJ 08855 USA. RI Haberle, Patricio/A-5774-2013 NR 42 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14256 EP 14263 DI 10.1103/PhysRevB.45.14256 PG 8 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200049 ER PT J AU JOYCE, SA CLARK, C CHAKARIAN, V SHUH, DK YARMOFF, JA MADEY, TE NORDLANDER, P MASCHHOFF, B TAO, HS AF JOYCE, SA CLARK, C CHAKARIAN, V SHUH, DK YARMOFF, JA MADEY, TE NORDLANDER, P MASCHHOFF, B TAO, HS TI INFLUENCE OF COADSORBED POTASSIUM ON THE ELECTRON-STIMULATED DESORPTION OF F+, F-, AND F-ASTERISK FROM PF3 ON RU(0001) SO PHYSICAL REVIEW B LA English DT Article ID ION ANGULAR-DISTRIBUTION; METAL-SURFACES; OSCILLATOR-STRENGTHS; CHARGE-TRANSFER; NEGATIVE-IONS; ADSORPTION; OXYGEN; NI(111); ATOMS; CO AB The electron-stimulated-desorption ion angular distributions (ESDIAD) of positive ions, negative ions, and metastable species from PF3 and K coadsorbed on a Ru(0001) surface are measured. In the absence of K, only positive- and negative-ion ESDIAD is observed, showing highly anisotropic, off-normal fluorine-ion emission (F+, F-) from PF3, which demonstrates that PF bonds are inclined away from the surface normal. In the presence of K, ESDIAD patterns of F+, F-, and metastable F* display only normal emission, suggesting a reorientation or chemical reaction which results in fluorine bonding perpendicular to the surface. Thermal desorption spectrometry, Auger electron spectroscopy, and soft-x-ray photoemission (SXPS) are used to determine the surface chemistry as an aid in intepreting the ESDIAD results. The SXPS data show that in the presence of potassium, PF3 dissociates, possibly forming KF-like species, which suggests that an alkali-metal-induced chemical reaction is reponsible for the changes observed in ESDIAD. The yields of the various desorbed fluorine species vary strongly with potassium coverage; the results for F- and F* are interpreted in terms of a charge-transfer model. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08855. RUTGERS STATE UNIV,SURFACE MODIFICAT LAB,PISCATAWAY,NJ 08855. RI Clark, Charles/A-8594-2009; Nordlander, Peter/A-2560-2008; Joyce, Stephen/Q-7804-2016 OI Clark, Charles/0000-0001-8724-9885; Nordlander, Peter/0000-0002-1633-2937; Joyce, Stephen/0000-0003-1330-7362 NR 40 TC 19 Z9 19 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14264 EP 14272 DI 10.1103/PhysRevB.45.14264 PG 9 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200050 ER PT J AU RUCKMAN, MW CHEN, J STRONGIN, M HORACHE, E AF RUCKMAN, MW CHEN, J STRONGIN, M HORACHE, E TI OXIDATION OF IRON FILMS AT 25 K AND THE REACTIVE OXIDATION OF IRON IN SOLID OXYGEN SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-LOSS-SPECTROSCOPY; INITIAL OXIDATION; ELECTRON-DIFFRACTION; LEED-AES; PHOTOEMISSION; FE(110); CHEMISORPTION; FE(001); ADSORPTION; SURFACES AB The oxidation of iron films at approximately 25 K and the reactive formation of iron oxides in a solid oxygen matrix is investigated using synchrotron-radiation-based photoemission. For O2 on Fe, the oxygen molecules dissociate and go into a chemisorbed state. At intermediate oxygen coverages, a disordered divalent FeO-like phase grows at the expense of the chemisorbed state. Further exposures of oxygen lead to the condensation of molecular oxygen on top of the oxide. Initial Fe depositions into a solid molecular oxygen film produce a trivalent Fe2O3-like phase. At higher iron coverages divalent FeO-like and metallic iron phases form because the supply of O2 for the oxide-forming reaction decreases. C1 UNIV PENN,DEPT MAT SCI & ENGN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 37 TC 19 Z9 19 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14273 EP 14278 DI 10.1103/PhysRevB.45.14273 PG 6 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200051 ER PT J AU KRESIN, VV AF KRESIN, VV TI ELECTRON-DISTRIBUTION AND COLLECTIVE RESONANCES IN NONSPHERICAL METAL-CLUSTERS SO PHYSICAL REVIEW B LA English DT Article ID SURFACE; PHOTOABSORPTION; FREQUENCIES; SPHERES AB The influence of shape deformation on the electronic structure and photoabsorption resonances of open-shell metal clusters is analyzed. A general approach is developed which takes into account both shape and electron spill-out effects, The method employs a special coordinate transformation and the sum-rule formalism. Analytical expressions are given for the valence electron density distribution and the splitting of collective resonances in spheroidal clusters. Applications to cluster photoabsorption experiments are discussed. RP KRESIN, VV (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Kresin, Vitaly/N-8095-2014 OI Kresin, Vitaly/0000-0002-6226-4576 NR 23 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14321 EP 14327 DI 10.1103/PhysRevB.45.14321 PG 7 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200057 ER PT J AU KELLOGG, GL AF KELLOGG, GL TI DIFFUSION OF PD-ADATOMS AND STABILITY OF PD-OVERLAYERS ON THE (011) SURFACE OF PT SO PHYSICAL REVIEW B LA English DT Article ID ATOMIC EXCHANGE MECHANISM; SELF-DIFFUSION; INDUCED RECONSTRUCTION; PT(110); AG(110); LEED; PLATINUM; IRIDIUM AB Field-ion microscopy has been used to examine the migration of individual Pd atoms and the stability of Pd overlayers on the (011) surface of Pt. Pd atoms are found to migrate within the [011BAR] surface channels in the temperature range 207-235 K with an activation energy of 0.58+/-0.05 eV. Cross-channel displacements are not observed. Clusters of Pd atoms on Pt (011) form stable (1 X 1) structures at temperatures below 300 K and do not reconstruct to the "missing-row" structure. Pd adatoms deposited on top of (1 X 1) Pd overlayers are found to diffuse in channel at a temperature of 167 K. RP KELLOGG, GL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 34 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14354 EP 14357 DI 10.1103/PhysRevB.45.14354 PG 4 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200061 ER PT J AU SURANYI, E GONIS, A AF SURANYI, E GONIS, A TI ANALYTIC PROPERTIES OF THE KORRINGA-KOHN-ROSTOKER COHERENT-POTENTIAL APPROXIMATION SO PHYSICAL REVIEW B LA English DT Note AB It is shown that the coherent-potential approximation when used in connection with the Green-function formalism of Korringa, Kohn, and Rostoker (KKR-CPA) yields an effective-medium propagator and self-energy that possess the proper analytic structure in the complex-energy plane. The proof emphasizes the unifying features of the CPA within the tight-binding and KKR formalisms, and it is valid for the case of both muffin-tin as well as arbitrarily shaped, space-filling potential cells. RP SURANYI, E (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14371 EP 14373 DI 10.1103/PhysRevB.45.14371 PG 3 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200064 ER PT J AU MACLAREN, JM GONIS, A SCHADLER, G AF MACLAREN, JM GONIS, A SCHADLER, G TI 1ST-PRINCIPLES CALCULATION OF STACKING-FAULT ENERGIES IN SUBSTITUTIONALLY DISORDERED ALLOYS SO PHYSICAL REVIEW B LA English DT Note ID COHERENT-POTENTIAL APPROXIMATION; GROUND-STATE AB A generalization of the coherent-potential approximation to two-dimensional defects in substitutionally disordered alloys, based on the layer Korringa-Kohn-Rostoker method, is presented. We illustrate the method with ab initio, self-consistent total-energy calculations implemented within the muffin-tin approximation of intrinsic stacking-fault energies in various Cu1-xZnx alloys (x=0, 0.1, 0.2, and 0.3). Excellent agreement is found between calculated fault energies and experimentally determined values. C1 LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, LIVERMORE, CA 94550 USA. SWISS FED INST TECHNOL, FESTKORPERPHYS LAB, CH-8092 ZURICH, SWITZERLAND. RP TULANE UNIV, DEPT PHYS, NEW ORLEANS, LA 70118 USA. NR 24 TC 20 Z9 20 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 24 BP 14392 EP 14395 DI 10.1103/PhysRevB.45.14392 PG 4 WC Physics, Condensed Matter SC Physics GA JA212 UT WOS:A1992JA21200070 ER PT J AU KOLB, EW WANG, Y AF KOLB, EW WANG, Y TI DOMAIN-WALL FORMATION IN LATE-TIME PHASE-TRANSITIONS SO PHYSICAL REVIEW D LA English DT Article ID PSEUDO-GOLDSTONE BOSONS AB We investigate domain-wall formation in late-time phase transitions. We find that, as in the invisible-axion-domain-wall phenomenon, thermal effects alone are insufficient to drive different regions of the Universe to different parts of the disconnected vacuum manifold. This suggests that domain walls do not form unless either there is some supplemental (but perhaps not unreasonable) dynamics to localize the scalar field responsible for the phase transition to the low-temperature maximum (to an extraordinary precision) before the onset of the phase transition, or there is some nonthermal mechanism to produce large fluctuations in the scalar field. The fact that domain-wall production is not a robust prediction of late-time transitions may suggest future directions in model building. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. RP KOLB, EW (reprint author), UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106, USA. RI Wang, Yun/B-5724-2011 OI Wang, Yun/0000-0002-4749-2984 NR 10 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1992 VL 45 IS 12 BP 4421 EP 4427 DI 10.1103/PhysRevD.45.4421 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200010 ER PT J AU KOSOWSKY, A TURNER, MS WATKINS, R AF KOSOWSKY, A TURNER, MS WATKINS, R TI GRAVITATIONAL-RADIATION FROM COLLIDING VACUUM BUBBLES SO PHYSICAL REVIEW D LA English DT Article ID EXTENDED INFLATION; FALSE VACUUM; UNIVERSE; STRINGS; FATE AB In the linearized-gravity approximation we numerically compute the amount of gravitational radiation produced by the collision of two true-vacuum bubbles in Minkowski space. The bubbles are separated by distance d and we calculate the amount of gravitational radiation that is produced in a time tau approximately d (in a cosmological phase transition tau-corresponds to the duration of the transition, which is expected to be of the order of the mean bubble separation d). Our approximations are generally valid for tau less-than-or-similar-to H-1. We find that the amount of gravitational radiation produced depends only upon the grosset features of the collision: the time tau and the energy density associated with the false-vacuum state, rho(vac). In particular, the spectrum dE(GW)/d-omega is-proportional-to rho(vac)2-tau(6) and peaks at a characteristic frequency omega(max) congruent-to 3.8/tau, and the fraction of the vacuum energy released into gravitational waves is about 1.3 x 10(-3) (tau/H-1)2, where H-2 = 8-pi-G-rho(vac)/3 (tau/H-1 is expected to be of the order of a few percent). We address in some detail the important symmetry issues in the problem, and how the familiar "quadrupole approximation" breaks down in a most unusual way: it overestimates the amount of gravitational radiation produced in this highly relativistic situation by more than a factor of 50. Most of our results are for collisions of bubbles of equal size, though we briefly consider the collision of vacuum bubbles of unequal size. Our work implies that the vacuum-bubble collisions associated with a strongly first-order phase transition are a very potent cosmological source of gravitational radiation. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP KOSOWSKY, A (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 31 TC 133 Z9 133 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 JUN 15 PY 1992 VL 45 IS 12 BP 4514 EP 4535 DI 10.1103/PhysRevD.45.4514 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200018 ER PT J AU YEE, K AF YEE, K TI GAUGE-FIXING AMBIGUITIES AND GAUGE DEPENDENCE OF GAUGE-VARIANT SCHWINGER-MODEL CORRELATION-FUNCTIONS SO PHYSICAL REVIEW D LA English DT Article ID SINE-GORDON EQUATION; QUARK CONFINEMENT; GLUON PROPAGATOR; GRIBOV AMBIGUITY AB Motivated by recent numerical studies of gauge-variant correlation functions in (3+1)-dimensional lattice QCD, we examine quark and photon correlation functions in the massless Schwinger model on D = 1+1 Minkowski space M2. Quantizing QED M2 in covariant gauges, we find that (i) the effective quark mass depends on the covariant gauge parameter xi and (ii) gauge-fixing ambiguities modify operator-product-expansion coefficients computed by matching nonperturbative quark correlation functions. RP YEE, K (reprint author), BROOKHAVEN NATL LAB,PHYS THEORY GRP,UPTON,NY 11973, USA. NR 36 TC 5 Z9 5 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1992 VL 45 IS 12 BP 4644 EP 4651 DI 10.1103/PhysRevD.45.4644 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200030 ER PT J AU KLUGER, Y EISENBERG, JM SVETITSKY, B COOPER, F MOTTOLA, E AF KLUGER, Y EISENBERG, JM SVETITSKY, B COOPER, F MOTTOLA, E TI FERMION PAIR PRODUCTION IN A STRONG ELECTRIC-FIELD SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; VACUUM; MODEL AB The initial-value problem for the quantum back reaction in spinor QED is formulated and solved in the semiclassical mean-field approximation for a homogeneous but time-dependent electric field E(t). We apply the method of adiabatic regularization to the Dirac equation in order to renormalize the expectation value of the current and derive a finite coupled set of ordinary differential equations for the time evolution of the system. We solve this system in 1+1 dimensions numerically and compare the solution to a simple model based on a relativistic Boltzmann-Vlasov equation, with a particle production source term inferred from the Schwinger particle creation rate and a Pauliblocking factor. This model reproduces very well the time behavior of the electric field and the creation rate of e+ e- pairs of the semiclassical calculation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP KLUGER, Y (reprint author), TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. OI Svetitsky, Benjamin/0000-0001-5536-4707 NR 26 TC 164 Z9 165 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1992 VL 45 IS 12 BP 4659 EP 4671 DI 10.1103/PhysRevD.45.4659 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200032 ER PT J AU BARDEEN, WA LOVE, ST AF BARDEEN, WA LOVE, ST TI EFFECTIVE LAGRANGIAN FOR SCALE-INVARIANT QUANTUM ELECTRODYNAMICS SO PHYSICAL REVIEW D LA English DT Article ID DYNAMICAL SYMMETRY-BREAKING; GAUGE FIELD-THEORIES; VECTOR-GLUON MODEL; SELF-ENERGY PARTS; CHIRAL-SYMMETRY; TECHNICOLOR THEORIES; CONTINUUM-LIMIT; CRITICAL LINE; HIERARCHIES; EQUATION AB In the critical scaling region of quenched, planar QED a composite scalar state plays an essential role in the effective dynamics. We construct an effective potential describing the dynamics of this state for both weak and strong gauge coupling. The scalar propagator at the strong-coupling end point is also constructed using dispersion relation techniques. The role of the four-fermion interaction in the critical region is emphasized and the fate of the scale symmetry elucidated. C1 PURDUE UNIV, DEPT PHYS, W LAFAYETTE, IN 47907 USA. RP FERMI NATL ACCELERATOR LAB, MS 106, POB 500, BATAVIA, IL 60510 USA. NR 34 TC 21 Z9 21 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1992 VL 45 IS 12 BP 4672 EP 4680 DI 10.1103/PhysRevD.45.4672 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200033 ER PT J AU BLUDMAN, SA AF BLUDMAN, SA TI IMPROVED COSMOLOGICAL AND RADIATIVE DECAY CONSTRAINTS ON NEUTRINO MASSES AND LIFETIMES SO PHYSICAL REVIEW D LA English DT Note ID UNIVERSE; MAJORONS; LIMITS; SN-1987A; SO(10); MODEL AB The best upper bounds on the masses of stable and unstable light neutrinos derive from the upper bound on the total mass density, as inferred from the lower limit t(0) > 13 Gyr on the dynamical age of the Universe: If the Universe is matter dominated, m(v) < 35 (23) x max[1,(t(0)/tau(nu))1/2] eV, accordingly as a cosmological constant is (is not) allowed. The best bounds on the radiative decay of light neutrinos derive from the failure to observe prompt-gamma rays accompanying the neutrinos from supernova 1987A: For any m(nu) > 630 eV, this provides a stronger bound on the neutrino transition moment than that obtained from red giants or white dwarfs. Our results improve on earlier cosmological and radiative decay constraints by an overall factor 20 and allow neutrinos more massive than 35 eV only if they decay overwhelmingly into singlet Majorons or other new particles with a lifetime less than one month. We review the 17-keV neutrino situation in order to stress that (1) its existence may be resolved by modest improvements in neutrino oscillation probabilities, and (2) double-beta decay and nucleosynthesis constraints require that its massive partner be an active neutrino, but allow solar neutrinos to oscillate into low-mass sterile neutrinos. RP BLUDMAN, SA (reprint author), LAWRENCE BERKELEY LAB,CTR PARTICLE ASTROPHYS,DIV NUCL SCI,THEORY GRP,BERKELEY,CA 94720, USA. NR 37 TC 28 Z9 28 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1992 VL 45 IS 12 BP 4720 EP 4723 DI 10.1103/PhysRevD.45.4720 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ562 UT WOS:A1992HZ56200040 ER PT J AU MISHRA, SR LEUNG, WC ARROYO, C BACHMANN, KT BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK SANDLER, PH SMITH, WH AF MISHRA, SR LEUNG, WC ARROYO, C BACHMANN, KT BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, FJ SELIGMAN, WG SHAEVITZ, MH MERRITT, FS OREGLIA, MJ SCHUMM, BA BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, MJ MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, DD BODEK, A BUDD, HS DEBARBARO, P SAKUMOTO, WK SANDLER, PH SMITH, WH TI SEARCH FOR RIGHT-HANDED COUPLING IN NU-N SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article AB The relative absence of nu(mu)BAR-induced charged current events with respect to nu(mu)-induced events at large x (> 0.45) and large y (> 0.70) enables us to limit the right handed coupling of the weak current. Our data restrict \eta\2=\g(R)/g(L)\2 < 0.0015 with 90% C.L. Within the framework of left-right symmetric models, this measurement imposes a limit upon the mixing angle of the left and right handed bosons. Unlike the limits imposed by the mu-decay and nuclear beta-decay experiments, our limit is valid irrespective of the mass of the right handed neutrino. C1 COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV WISCONSIN,MADISON,WI 53706. NR 10 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3499 EP 3502 DI 10.1103/PhysRevLett.68.3499 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300004 ER PT J AU SAEED, M YANG, B TANG, X DIMAURO, LF AF SAEED, M YANG, B TANG, X DIMAURO, LF TI ENERGY PARTITION AMONG FRAGMENTS AND ELECTRONS IN HIGH-FIELD DISSOCIATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID IONIZATION; ATOMS AB We present an experimental investigation for chlorine molecules and their atomic fragments in which high field molecular dissociation is followed by fragment ionization. It is shown that the intensity dependence of the photoelectron and atomic photofragment energy spectra provides a direct measure of the fragments' ac-Stark shift. Furthermore, we observe an unusually strong above-threshold ionization photoelectron series associated with the two-photon ionization of the excited chlorine fragment. This implies that the fragments are experiencing field strengths in excess of the "low field" saturation intensity. These results are compared to a single-channel quantum-defect calculation. RP SAEED, M (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 12 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3519 EP 3522 DI 10.1103/PhysRevLett.68.3519 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300009 ER PT J AU KRAUSE, JL SCHAFER, KJ KULANDER, KC AF KRAUSE, JL SCHAFER, KJ KULANDER, KC TI HIGH-ORDER HARMONIC-GENERATION FROM ATOMS AND IONS IN THE HIGH-INTENSITY REGIME SO PHYSICAL REVIEW LETTERS LA English DT Article ID MODEL AB We present calculated optical harmonic spectra for atoms and ions in the high intensity regime relevant to current short-pulse experiments. We find that ions can produce harmonics comparable in strength to those obtained from neutrals, and that the emission extends to much higher order. Simple scaling laws for the strength of the harmonic emission and the maximum observable harmonic are suggested. These results imply that the photoemission observed in recent experiments in helium and neon contains contributions from ions as well as neutrals. RP KRAUSE, JL (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 14 TC 812 Z9 827 U1 14 U2 81 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3535 EP 3538 DI 10.1103/PhysRevLett.68.3535 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300013 ER PT J AU WOLK, JA WALUKIEWICZ, W THEWALT, MLW HALLER, EE AF WOLK, JA WALUKIEWICZ, W THEWALT, MLW HALLER, EE TI FORMATION OF A DX CENTER IN INP UNDER HYDROSTATIC-PRESSURE SO PHYSICAL REVIEW LETTERS LA English DT Article ID PERSISTENT PHOTOCONDUCTIVITY; DEFORMATION POTENTIALS; ELECTRONIC-STRUCTURE; SEMICONDUCTORS; MODEL; ALXGA1-XAS; ABSORPTION; DONOR AB We have discovered a DX center in InP:S under hydrostatic pressure greater than 82 kbar. This defect exhibits the persistent photoconductivity typical of such centers. The optical ionization energy for this new DX center is between 0.86 and 1.02 eV, and we have measured the energy dependence of the optical absorption cross section. The thermal barrier for capture from the shallow donor state into the deep DX state is in the range 0.23-0.33 eV. We estimate that at zero pressure the energy of the DX center lies 0.51 +/- 0.07 eV above the GAMMA-conduction-band minimum. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. SIMON FRASER UNIV,DEPT PHYS,BURNABY V5A 1S6,BC,CANADA. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP WOLK, JA (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Thewalt, Michael/B-3534-2008 OI Thewalt, Michael/0000-0002-5806-0618 NR 25 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3619 EP 3622 DI 10.1103/PhysRevLett.68.3619 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300034 ER PT J AU TOBIN, JG WADDILL, GD PAPPAS, DP AF TOBIN, JG WADDILL, GD PAPPAS, DP TI GIANT X-RAY ABSORPTION CIRCULAR-DICHROISM IN MAGNETIC ULTRATHIN FILMS OF FE/CU(001) SO PHYSICAL REVIEW LETTERS LA English DT Article ID FCC FE FILMS; CU(100) AB Extraordinarily large circular dichroism has been observed in the near-edge x-ray absorption of the Fe 2p3/2 and 2p1/2 lines of monolayer magnetic films of Fe on Cu(001). This is the first reported observation of normal incidence dichroism in a metal overlayer. Analysis of such large variations using a simple and concise theoretical formulation suggests a saturation of the dichroism effect. This analytical approach also permits an approximate determination of the magnetic moment directly from experimental parameters. C1 IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120. RP TOBIN, JG (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 25 TC 95 Z9 95 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3642 EP 3645 DI 10.1103/PhysRevLett.68.3642 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300040 ER PT J AU FOUGERE, GE WEERTMAN, JR SIEGEL, RW KIM, S AF FOUGERE, GE WEERTMAN, JR SIEGEL, RW KIM, S TI GRAIN-SIZE DEPENDENT HARDENING AND SOFTENING OF NANOCRYSTALLINE CU AND PD SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID HALL-PETCH RELATIONSHIP; MICROHARDNESS C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. YEUNG NAM UNIV,DEPT PRECIS MECH ENGN,GYONGSAN 632,SOUTH KOREA. RP FOUGERE, GE (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Weertman, Julia/B-7540-2009 NR 11 TC 175 Z9 180 U1 5 U2 30 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN 15 PY 1992 VL 26 IS 12 BP 1879 EP 1883 DI 10.1016/0956-716X(92)90052-G PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HW367 UT WOS:A1992HW36700017 ER PT J AU WANG, ZL BENTLEY, J KENIK, EA HORTON, LL MCKEE, RA AF WANG, ZL BENTLEY, J KENIK, EA HORTON, LL MCKEE, RA TI INSITU FORMATION OF MGO2 THIN-FILMS ON MGO SINGLE-CRYSTAL SURFACES AT HIGH-TEMPERATURES SO SURFACE SCIENCE LA English DT Article ID REFLECTION ELECTRON-MICROSCOPY; 111 SILICON SURFACES; FCC METALS; RHEED; REM AB Structures on MgO(100) surfaces heated to high temperatures have been comprehensively studied in-situ using the combined electron microscopy techniques of imaging (REM, HREM), diffraction (RHEED, THEED) and spectroscopy (REELS, TEELS, EDS) in both reflection and transmission geometries. A thin film, less than about 10 atomic layers in thickness. is formed on the surface after heating to 1500 K inside a conventional electron microscope. The newly formed film consists of mainly MgO2 and small amounts of calcium and chromium impurities produced by surface segregation at high temperature. The film covers the entire surface in patches of a few tens of nanometers in size; the [110] direction and the (001) plane of each MgO2 patch are parallel to the [110] direction and the {111} plane of the MgO matrix, respectively. This MgO2 film is stable at high temperature (1500 K), room temperature. and even after being exposed to air for two weeks, and can be produced on surfaces other than (100) such as irregularly shaped MgO fragments. It has been found that multiple-diffraction effects may create additional "rods" in RHEED patterns, leading to possibly incorrect structural interpretation. The combination of RHEED with imaging techniques is important for solving the surface structures. C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 32 TC 25 Z9 25 U1 1 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 JUN 15 PY 1992 VL 273 IS 1-2 BP 88 EP 108 DI 10.1016/0039-6028(92)90278-E PG 21 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JA640 UT WOS:A1992JA64000021 ER PT J AU KUO, CT KWOR, R JONES, KM AF KUO, CT KWOR, R JONES, KM TI STUDY OF SPUTTERED HFO2 THIN-FILMS ON SILICON SO THIN SOLID FILMS LA English DT Article ID DIELECTRIC-PROPERTIES; HAFNIUM COMPOUNDS; OXIDE-FILMS; CAPACITORS; INSULATOR; CIRCUITS AB Thin HfO2 films were deposited on Si(100) wafers by magnetron sputtering, followed by a high temperature anneal in oxygen. Structure evolution and/or allotropic transformation occurred during the annealing process. A very thin well-defined SiO2 layer was also formed at the HfO2-Si interface as a result of annealing. The HfO2/SiO2 film showed a high dielectric constant, very low leakage current, extremely high dielectric strength, low dielectric loss, well-behaved capacitance-voltage characteristics and good stability, making it a viable candidate for applications in very-large-scale and ultralarge-scale integration circuits. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP KUO, CT (reprint author), UNIV COLORADO,DEPT ELECT & COMP ENGN,COLORADO SPRINGS,CO 80933, USA. NR 28 TC 52 Z9 54 U1 0 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD JUN 15 PY 1992 VL 213 IS 2 BP 257 EP 264 DI 10.1016/0040-6090(92)90291-I PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HY247 UT WOS:A1992HY24700018 ER PT J AU ZACHOS, CK AF ZACHOS, CK TI ALTERING THE SYMMETRY OF WAVE-FUNCTIONS IN QUANTUM ALGEBRAS AND SUPERSYMMETRY SO MODERN PHYSICS LETTERS A LA English DT Article AB The statistics-altering operators M present in the limit q = -1 of multiparticle SUq(2)-invariant subspaces parallel the action of such operators which naturally occur in supersymmetric theories. We illustrate this heuristically by comparison to a toy N = 2 supersymmetry algebra, and ask whether there is a supersymmetry structure underlying SUq(2) at that limit. We remark on the relevance of such alternating-symmetry multiplets to the construction of invariant Hamiltonians. RP ZACHOS, CK (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD JUN 14 PY 1992 VL 7 IS 18 BP 1595 EP 1600 DI 10.1142/S0217732392001270 PG 6 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA JB364 UT WOS:A1992JB36400002 ER PT J AU FAIDAS, H CHRISTOPHOROU, LG MCCORKLE, DL AF FAIDAS, H CHRISTOPHOROU, LG MCCORKLE, DL TI LASER PHOTODETACHMENT IN LIQUIDS - C6F6- IN TETRAMETHYLSILANE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-AFFINITIES AB The photodetachment cross section of C6F6- in liquid tetramethylsilane was measured as a function of the photon energy, using a new two laser photoconductivity technique. The photodetachment threshold was found to be 1.51 eV using a 3/2 power threshold law. Two maxima were observed in the photodetachment cross section at photon energies of 2.58 and 3.15 eV; the cross section value at these two maxima is almost-equal-to 11X10(-18) cm2. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP FAIDAS, H (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,ATOM MOLEC & HIGH VOLTAGE PHYS GRP,OAK RIDGE,TN 37831, USA. NR 21 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 12 PY 1992 VL 193 IS 6 BP 487 EP 492 DI 10.1016/0009-2614(92)85837-Z PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ329 UT WOS:A1992HZ32900008 ER PT J AU MEDHURST, LJ HEIMANN, PA SIGGEL, MRF SHIRLEY, DA CHEN, CT MA, Y MODESTI, S SETTE, F AF MEDHURST, LJ HEIMANN, PA SIGGEL, MRF SHIRLEY, DA CHEN, CT MA, Y MODESTI, S SETTE, F TI VIBRATIONALLY RESOLVED THRESHOLD PHOTOEMISSION OF N2 AND CO AT THE N-K EDGE AND C-K EDGE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PHOTOIONIZATION; SATELLITES; MOLECULE; SPECTRA AB Zero-kinetic-energy photoelectron spectroscopy was used to measure the Franck-Condon factors for the carbon and nitrogen K-shell ionized states in N2 and CO. Corresponding features in the two spectra showed nearly identical energy spacings, both below and above the ionization threshold, as predicted by the equivalent-core model. The equilibrium bond length, R(e) for the CO C-1s-1 state was determined to be 1.077+/-0.005 angstrom, and R(e) for the N2 N-1s-1 state was found to be 1.077+/-0.010 angstrom, changes of -0.051 angstrom for CO and -0.020 angstrom for N2 from their ground-state equilibrium bond lengths. The two-electron states corresponding to 1s-1 val-1-pi* were examined in the binding energy region predicted by Green function calculations. Two-electron states absent in the X-ray photoemission spectrum are present in both molecules and show evidence of vibrational structure. C1 UNIV CALIF BERKELEY,DEPT CHEM,1 CYCLOTRON RD,MS 2-300,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. AT&T BELL LABS,MURRAY HILL,NJ 07974. NR 19 TC 47 Z9 47 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 JUN 12 PY 1992 VL 193 IS 6 BP 493 EP 498 DI 10.1016/0009-2614(92)85838-2 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ329 UT WOS:A1992HZ32900009 ER PT J AU SEWELL, TD THOMPSON, DL GEZELTER, JD MILLER, WH AF SEWELL, TD THOMPSON, DL GEZELTER, JD MILLER, WH TI SOME PROBLEMS OF CORRECTING THE ZERO-POINT ENERGY PROBLEM IN CLASSICAL TRAJECTORIES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HYDROGEN-PEROXIDE; MODE SPECIFICITY; DISSOCIATION; DYNAMICS AB We have examined the effects on the fundamental behavior of the dynamics of applying constraints to control the aphysical flow of zero-point energy in classical trajectories of molecular systems. Test calculations on the popular Henon-Heiles potential surface show that these costraints can induce physically undesirable effects in the dynamics, e.g., changing quasiperiodic motion (characterized by a few discrete frequencies) into chaotic motion (characterized by a continuous distribution of frequencies). C1 OKLAHOMA STATE UNIV,DEPT CHEM,STILLWATER,OK 74078. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Gezelter, J. Daniel/D-1894-2010 OI Gezelter, J. Daniel/0000-0002-2935-3163 NR 16 TC 49 Z9 49 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 12 PY 1992 VL 193 IS 6 BP 512 EP 517 DI 10.1016/0009-2614(92)85841-W PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HZ329 UT WOS:A1992HZ32900012 ER PT J AU YU, DW GATLEY, SJ WOLF, AP MACGREGOR, RR DEWEY, SL FOWLER, JS SCHLYER, DJ AF YU, DW GATLEY, SJ WOLF, AP MACGREGOR, RR DEWEY, SL FOWLER, JS SCHLYER, DJ TI SYNTHESIS OF C-11 LABELED IODINATED COCAINE DERIVATIVES AND THEIR DISTRIBUTION IN BABOON BRAIN MEASURED USING POSITRON EMISSION TOMOGRAPHY SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID BINDING; RECEPTORS; DOPAMINE; TRANSPORTERS; SITES AB Three iodine-substituted derivatives of cocaine, methyl esters of 3-[(2'-, 3'-, and 4'-iodobenzoyl)oxy]-8-methyl-[1R-(exo,exo)]-8-azabicyclo [3.2.1]octane-2-carboxylic acid (2a-c), were synthesized and subjected to N-demethylation to give the corresponding noriodococaines 3-[(2'-, 3'-, and 4'-iodobenzoyl)oxy]-[1R-(exo,exo)]-8-azabicyclo[3.2.1]-octane-2-carboxylic acid (3a-c). These were remethylated with [C-11]CH3I to give the [N-C-11-methyl]iodococaines 4a-c which were examined in baboon brain in vivo using positron emission tomography (PET). Compared to [N-C-11]cocaine itself the regional distributions were changed from a highly specific localization in the corpus striatum to more diffuse patterns which included the cerebellum and cortex. Peak brain uptakes and clearance kinetics were also changed. [N-C-11]-o-lodococaine (4a) had a peak uptake in the striatum at 4-5 min after injection of only 17% that of cocaine in the same animal. The peak uptake of [N-C-11]-p-iodococaine (4c) was 60% of that of [N-C-11]cocaine and a clearance half-time of approximately 55 min, twice that of [N-C-11]cocaine. [N-C-11]-m-Iodococaine (4b) displayed half the uptake of [N-C-11]cocaine, buts its clearance was similar to that of the parent molecule. The fractions of unmetabolized tracer in blood plasma at 1-30 min were higher for 4a-c than for [N-C-11]cocaine. Plasma protein binding experiments showed 10%, 0.3%, 1.6%, and 6% as the free fraction for cocaine and o-, m-, and p-iodococaines respectively, consistent with the low brain uptake observed for the ortho isomer, and implicated al-acid glycoprotein as responsible for the low free fraction of o-iodococaine. The potencies of 2a-c to displace tritiated cocaine from striatal membranes were p-iodo almost-equal-to cocaine > m-iodo almost-equal-to o-iodo. C1 BROOKHAVEN NATL LAB,DEPT OTOLARYNGOL & MAXILLOFACIAL SURG,UPTON,NY 11973. FU NINDS NIH HHS [NS-15380] NR 28 TC 41 Z9 42 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD JUN 12 PY 1992 VL 35 IS 12 BP 2178 EP 2183 DI 10.1021/jm00090a005 PG 6 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA HZ303 UT WOS:A1992HZ30300005 PM 1613745 ER PT J AU MYERS, G AF MYERS, G TI AIDS ORIGIN SO SCIENCE LA English DT Letter RP MYERS, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 12 PY 1992 VL 256 IS 5063 BP 1502 EP 1502 DI 10.1126/science.1530706 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HY075 UT WOS:A1992HY07500002 PM 1530706 ER PT J AU LOVEJOY, ER KIM, SK MOORE, CB AF LOVEJOY, ER KIM, SK MOORE, CB TI OBSERVATION OF TRANSITION-STATE VIBRATIONAL THRESHOLDS IN THE RATE OF DISSOCIATION OF KETENE SO SCIENCE LA English DT Article ID PHOTOFRAGMENTATION; EXCITATION; CH2(X3B1); SPECTRA AB Rate constants for the dissociation of highly vibrationally excited ketene (CH2CO) have been measured at the threshold for the production of CH2(B-3(1)) and CO(1-SIGMA+). The rate constant increases in a stepwise manner with increasing energy, consistent with the long-standing premise that the rate of a unimolecular reaction is controlled by flux through quantized transition-state thresholds. The data give the energies of the torsional and C-C-O bending vibrations of the transition state. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RP LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RI Kim, Sang Kyu/C-1613-2011 NR 17 TC 86 Z9 87 U1 0 U2 5 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 JUN 12 PY 1992 VL 256 IS 5063 BP 1541 EP 1544 DI 10.1126/science.256.5063.1541 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HY075 UT WOS:A1992HY07500024 PM 17836322 ER PT J AU FERRIERI, RA WOLF, AP AF FERRIERI, RA WOLF, AP TI REACTIONS INVOLVING HOT O(3P) ATOMS AND ISOMERIC 2-BUTENE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID OXYGEN-ATOMS AB The low-pressure gas-phase investigation is reported on the reactions involving high-energy O(3P) atoms with cis- and trans-2-butene. Gas chromatographic analysis of stable hydrocarbon end products revealed a complex spectrum of compounds containing carbonyl, epoxide, and alcohol groups. The large distribution of alcohol products was a distinct feature in these hot atom systems, indicating that OH radical formation was important. These analyses revealed differences in the internal energy levels of the reaction intermediates formed through the greater pressure dependence exhibited by the degree of stereospecific addition of oxygen atoms to trans-butene then reaction with cis-butene and through the greater degree of internal rearrangement and carbon-carbon bond scission exhibited by the trans intermediate. Direct measurements using on-line mass spectrometry also revealed that CO product signals were 14.6 times higher from reactions with cis-butene than with trans-butene, indicating greater reactivity of the cis pi-bond toward oxygen atom attack. Similarly, these direct analyses revealed that OH product signals were 1.7 times higher from reactions with cis-butene, suggesting that in addition to direct H abstraction an indirect pathway involving mutual interaction with the substrate's pi-bond may have contributed, in part, to those OH products observed in then studies. Kinetic energy moderator studies supported this hypothesis through the different moderator dependencies exhibited by the OH product signals seen to arise from high-energy oxygen atom reactions with the two stereoisomers. RP FERRIERI, RA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 24 TC 3 Z9 3 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 4747 EP 4752 DI 10.1021/j100191a006 PG 6 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200006 ER PT J AU HAN, P BARTELS, DM AF HAN, P BARTELS, DM TI H/D ISOTOPE EFFECTS IN WATER RADIOLYSIS .4. THE MECHANISM OF (H)AQ-REVERSIBLE-ARROW(E-)AQ INTERCONVERSION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYDRATED-ELECTRON; LIQUID WATER; QUANTUM SIMULATION; PULSE RADIOLYSIS; HYDROGEN-ATOMS; RADICALS; SPECTROSCOPY; ENTHALPY; DYNAMICS; ENTROPY AB We report new measurements of the reaction rates of H with OH- in light water and D with OD- in heavy water. Measurements performed by optical transient absorption and by EPR using the free induction decay attenuation method agree quantitatively. Arrhenius parameters for the H + OH- reaction are A = (1.33 +/- 0.16) x 10(14) M-1 s-1 and E(a) = 38.38 +/- 0.31 kJ/mol. For the D + OD- reaction corresponding parameters are A = (1.19 +/- 0.22) x 10(14) M-1 s-1 and E(a) = 38.16 +/- 0.47 kJ/mol. The reaction rate data for the forward and reverse reactions, taken together with our current understanding of the electron and H atom solvation structure and dynamics, lead us to conclude that the reaction mechanism is best described as a proton transfer from the weak acid (H)aq to the strong base (OH-)aq. The H atom effectively disproportionates, leaving the electron to become hydrated within the H atom solvent cage. By extension, numerous reactions of (e-)aq With protonated aqueous species and water itself can best be understood in terms of a proton transfer to the weak base (e-)aq. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 75 TC 55 Z9 56 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 4899 EP 4906 DI 10.1021/j100191a033 PG 8 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200033 ER PT J AU JIN, YM CHENG, JL VARMANAIR, M LIANG, GH FU, YG WUNDERLICH, B XIANG, XD MOSTOVOY, R ZETTL, AK AF JIN, YM CHENG, JL VARMANAIR, M LIANG, GH FU, YG WUNDERLICH, B XIANG, XD MOSTOVOY, R ZETTL, AK TI THERMODYNAMIC CHARACTERIZATION OF C-60 BY DIFFERENTIAL SCANNING CALORIMETRY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HEAT-CAPACITY MEASUREMENTS; LINEAR MACROMOLECULES; ICOSAHEDRAL SYMMETRY; SKELETAL VIBRATIONS; NORMAL-MODES; C-60; CARBON; BUCKMINSTERFULLERENE; SPECTRA; MOLECULES AB Heat capacity measurements on C60 were carried out by differential scanning calorimetry from 120 to 560 K. This heat capacity was linked based on existing normal-mode and lattice calculation, to the vibrational heat capacities. In this way the thermodynamic functions are available from absolute zero of temperature. The phase transition at 256 K could be identified as a crystal-to-plastic crystal transition with an increase in entropy of 27.3 J/(K mol). A broad beginning of this transition at 190 K is linked to the change from a jumplike rotation that is starting already at about 100 K without increase in entropy to the rotational motion that ultimately causes the disordering transition. This classification is based on reinterpretation of the solid-state NMR results with calorimetry data. No melting temperature could be detected up to 950 K, the temperature limit of our calorimeter. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RI Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; NR 46 TC 65 Z9 68 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 5151 EP 5156 DI 10.1021/j100191a073 PG 6 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200073 ER PT J AU GLEZEN, MM CHERNOVITZ, AC JONAH, CD AF GLEZEN, MM CHERNOVITZ, AC JONAH, CD TI PULSE-RADIOLYSIS OF DEXTRAN WATER SOLUTIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON AB The yield and rates of the reaction of the hydrated electron, e(aq)-, and the precursor of e(aq)- with nitromethane were measured in 5%-50% dextran solutions in water. The results show no decrease in the initial yield of e(aq)- nor in its reactivity. These results suggest that the dextran divides the solution into regions of water that are separated from each other by polymer and that the electron can move facilely within a water region but not across the polymer-water boundary. The results also suggest that the electron is more strongly hydrated than is the dextran molecule. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 29 TC 3 Z9 3 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 5180 EP 5183 DI 10.1021/j100191a079 PG 4 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200079 ER PT J AU KENNEDY, DC AF KENNEDY, DC TI WHICH THEORY SO NATURE LA English DT Letter RP KENNEDY, DC (reprint author), FERMI NATL ACCELERATOR LAB,DEPT THEORET PHYS,MAIL STOP 106,POB 500,BATAVIA,IL 60510, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 11 PY 1992 VL 357 IS 6378 BP 449 EP 450 DI 10.1038/357449b0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HY052 UT WOS:A1992HY05200040 ER PT J AU RYE, HS YUE, S WEMMER, DE QUESADA, MA HAUGLAND, RP MATHIES, RA GLAZER, AN AF RYE, HS YUE, S WEMMER, DE QUESADA, MA HAUGLAND, RP MATHIES, RA GLAZER, AN TI STABLE FLUORESCENT COMPLEXES OF DOUBLE-STRANDED DNA WITH BIS-INTERCALATING ASYMMETRIC CYANINE DYES - PROPERTIES AND APPLICATIONS SO NUCLEIC ACIDS RESEARCH LA English DT Article ID ACRIDINE ETHIDIUM HETERODIMER; LABELING REAGENTS; BIFUNCTIONAL INTERCALATORS; HOMODIMER; BINDING; BIS(ACRIDINES); D(AT)5.D(AT)5; H-1-NMR AB The synthesis, proof of structure, and the absorption and fluorescence properties of two new unsymmetrical cyanine dyes, thiazole orange dimer (TOTO; 1,1'-(4,4,7,7-tetramethyl-4,7-diazaundecamethylene)-bis-4-[3-methyl-2,3-dihydro-(benzo-1,3-thiazole)-2-methyl-idene]-quinolinium tetraiodide) and oxazole yellow dimer (YOYO; an analogue of TOTO with a benzo-1,3-oxazole in place of the benzo-1,3-thiazole) are reported. TOTO and YOYO are virtually non-fluorescent in solution, but form highly fluorescent complexes with double-stranded DNA (dsDNA), up to a maximum dye to DNA bp ratio of 1:4, with > 1 000-fold fluorescence enhancement. The dsDNA-TOTO (lambda(max) 513 nm lambda(max)F 532 nm) and dsDNA-YOYO (lambda(max) 489 n; lambda(max)F 509 nm) complexes are completely stable to electrophoresis on agarose and acrylamide gels. Mixtures of restriction fragments pre-labeled with ethidium dimer (EthD; lambda(max)F 616 nm) and those pre-labeled with either TOTO or YOYO were separated by electrophoresis. Laser excitation at 488 nm and simultaneous confocal fluorescence detection at 620 - 750 nm (dsDNA-EthD emission) and 500 - 565 nm (dsDNA-TOTO or dsDNA-YOYO emission) allowed sensitive detection, quantitation, and accurate sizing of restriction fragments ranging from 600 to 24,000 bp. The limit of detection of dsDNA-TOTO and YOYO complexes with a laser-excited confocal fluorescence gel scanner for a band 5-mm wide on a 1-mm thick agarose gel was 4 picograms, about 500-fold lower than attainable by conventional staining with ethidium bromide. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,MCB STANLEY DONNER ASU,229 STANLEY HALL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. MOLEC PROBES INC,EUGENE,OR 97402. FU NIGMS NIH HHS [GM08295] NR 22 TC 509 Z9 519 U1 10 U2 89 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUN 11 PY 1992 VL 20 IS 11 BP 2803 EP 2812 DI 10.1093/nar/20.11.2803 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HZ673 UT WOS:A1992HZ67300025 PM 1614866 ER PT J AU COLONNA, M ROUSSELCHOMAZ, P COLONNA, N DITORO, M MORETTO, LG WOZNIAK, GJ AF COLONNA, M ROUSSELCHOMAZ, P COLONNA, N DITORO, M MORETTO, LG WOZNIAK, GJ TI DYNAMICS AND STATISTICS IN MULTIFRAGMENT PRODUCTION SO PHYSICS LETTERS B LA English DT Article ID COMPLEX FRAGMENT EMISSION; HEAVY-ION COLLISIONS; TIME AB Complex fragment production in intermediate-energy heavy-ion reactions is described by coupling the dynamics of the collision stage with the subsequent statistical deexcitation stage. The simulations are compared to experimental data from the reaction La-139+Al-27 at 55 MeV/u. Many of the features observed in the inclusive charge distribution, as well as in the multifragment coincidence events are reproduced. C1 IST NAZL FIS NUCL,NUCL SCI LAB,CATANIA,ITALY. CENS,SEPN,F-91191 GIF SUR YVETTE,FRANCE. RP COLONNA, M (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 24 TC 30 Z9 30 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 11 PY 1992 VL 283 IS 3-4 BP 180 EP 184 DI 10.1016/0370-2693(92)90004-N PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA628 UT WOS:A1992JA62800004 ER PT J AU SHI, X SCHRAMM, DN AF SHI, X SCHRAMM, DN TI AN UPDATE ON THE SOLAR NEUTRINO PROBLEM AND THE 3-FAMILY MSW EFFECT ALLOWING FOR ASTROPHYSICAL UNCERTAINTIES SO PHYSICS LETTERS B LA English DT Article ID 3-NEUTRINO OSCILLATIONS; MATTER; PHYSICS; MASS AB Three-neutrino MSW mixing is considered, assuming m3(2) much greater than m2(2) much greater than m1(2) as expected from theoretical considerations, and the corresponding allowed mixing parameter space is calculated from the Cl-37 and Kamiokande II experiments. The expected depletion for the Ga-71 experiment is also calculated. The possible variations induced by a range of astrophysical uncertainty is explored by varying the B-8 neutrino flux and redoing the MSW mixing calculation with such variations, including the consistency with the possible atmospheric neutrino mixing observations. C1 FERMI NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP SHI, X (reprint author), UNIV CHICAGO,ENRICO FERMI INST,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 33 TC 58 Z9 58 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 JUN 11 PY 1992 VL 283 IS 3-4 BP 305 EP 312 DI 10.1016/0370-2693(92)90024-X PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA628 UT WOS:A1992JA62800024 ER PT J AU DINE, M LEIGH, RG HUET, P LINDE, A LINDE, D AF DINE, M LEIGH, RG HUET, P LINDE, A LINDE, D TI COMMENTS ON THE ELECTROWEAK PHASE-TRANSITION SO PHYSICS LETTERS B LA English DT Article ID BARYON ASYMMETRY; GAUGE-THEORIES; FINITE TEMPERATURE; SYMMETRY BEHAVIOR; FALSE VACUUM; UNIVERSE; COSMOLOGY; QCD AB We report on an investigation of various problems related to the theory of the electroweak phase transition. This includes a determination of the nature of the phase transition, a discussion of the possible role of higher order radiative corrections and the theory of the formation and evolution of the bubbles of the new phase. We find in particular that no dangerous linear terms appear in the effective potential. However, the strength of the first-order phase transition is 2/3 times less than what follows from the one-loop approximation. This rules out baryogenesis in the minimal version of the electroweak theory with light Higgs bosons. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. GUNN HIGH SCH,PALO ALTO,CA 94305. RP DINE, M (reprint author), UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064, USA. NR 48 TC 100 Z9 100 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 11 PY 1992 VL 283 IS 3-4 BP 319 EP 325 DI 10.1016/0370-2693(92)90026-Z PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA628 UT WOS:A1992JA62800026 ER PT J AU ADEVA, B ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDERSON, EW ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BRUYANT, F BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, E PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A AF ADEVA, B ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDERSON, EW ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLOMEKE, P BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BRUYANT, F BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KRIZMANIC, J KUMAR, KS KUMAR, V KUNIN, A LANDI, G LANIUS, K LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTAM, L LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIESSEN, L NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, E PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VONDARDEL, G VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A TI SEARCH FOR THE NEUTRAL HIGGS BOSON AT LEP SO PHYSICS LETTERS B LA English DT Article ID Z0 DECAY; E+E COLLISIONS; MONTE-CARLO; MASS; LIMITS AB A search for the standard model neutral Higgs boson is described. Data collected during 1990 and 1991, corresponding to 408 000 hadronic decays of the Z0, were used. At the 95% confidence level we exclude the existence of the minimal standard model Higgs boson in the mass range 0 less-than-or-equal-to M(H0) < 52 GeV. C1 IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. IOWA STATE UNIV SCI & TECHNOL, AMES, IA 50011 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. IST NAZL FIS NUCL, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB PHYS PARTICULES, F-74519 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADEVA, B (reprint author), CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. RI Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; Adeva, Bernardo /L-1378-2014; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; Tsaregorodtsev, Andrei/E-3873-2016; OI Leijtens, Xaveer/0000-0001-7794-8236; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; Chmeissani, Mokhtar/0000-0002-2287-4791; Adeva, Bernardo /0000-0001-9756-3712; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530 NR 44 TC 22 Z9 22 U1 1 U2 2 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 JUN 11 PY 1992 VL 283 IS 3-4 BP 454 EP 464 DI 10.1016/0370-2693(92)90047-8 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JA628 UT WOS:A1992JA62800047 ER PT J AU CHOU, MH CREUTZ, C SUTIN, N AF CHOU, MH CREUTZ, C SUTIN, N TI DONOR-ACCEPTOR ELECTRONIC COUPLING AS A FUNCTION OF BRIDGING GROUP - MIXED-VALENCE DIRUTHENIUM(II,III) COMPLEXES BRIDGED BY ISONICOTINATO AND ISONICOTINAMIDO LIGANDS SO INORGANIC CHEMISTRY LA English DT Article ID RUTHENIUM-AMMINE COMPLEXES; CHARGE-TRANSFER SPECTRA; ISOMERIC FORMS; AMINO-ACIDS; POLYPEPTIDES; PEPTIDES; PEROXYDISULFATE; SUBSTITUTION; OXIDATION; PROTEINS AB Binuclear, mixed-valence mu-isonicotinato and mu-isonicotinamido complexes capped by pentaammineruthenium(II) at the pyridine site and pentaammineruthenium(III) at the carboxylato or amido site have been synthesized and characterized. On the basis of their electronic absorption spectra and redox properties, the amido complexes are assigned as the N-bonded (Ru(III)-NHC(O)R) isomers. The mixed-valence complexes exhibit intervalence charge-transfer bands at 720 nm (epsilon = 2.6 x 10(2) M-1 cm-1) and 761 nm (0.9 x 10(3) M-1 cm-1), respectively, in aqueous acetate buffer at pH 4.8. The redox potentials of the two sites differ by 0.44 V in the isonicotinato and by 0.54 V in the isonicotinamido complexes in the above medium, and the donor-acceptor coupling elements, evaluated from the intensities of the intervalence bands, are 300 and 510 cm-1, respectively. Solvent dependences of the electronic spectra and electrochemical parameters are also reported. Both bridges provide significant coupling between the Ru(II) and Ru(III) metal centers in the mixed-valence complexes. These coupling energies serve as a point of departure for a consideration of coupling mechanisms in related polyproline-bridged systems for which thermal electron-transfer rates have been determined. It is concluded that "hole" transfer pathways predominate when osmium(II) pentaammine is the donor and cobalt(III) or ruthenium(III) pentaammine is the electron acceptor. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 70 TC 49 Z9 49 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 10 PY 1992 VL 31 IS 12 BP 2318 EP 2327 DI 10.1021/ic00038a007 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HY814 UT WOS:A1992HY81400007 ER PT J AU SCOTT, B WILLETT, R PORTER, L WILLIAMS, J AF SCOTT, B WILLETT, R PORTER, L WILLIAMS, J TI SYNTHESIS AND CHARACTERIZATION OF THE PSEUDO-1-D MIXED-VALENCE (ET4-(N)ME(N)N)CU2X4 SALTS - PINNED CHARGE-DENSITY WAVE SYSTEMS EXHIBITING INTERVALENCE CHARGE-TRANSFER SO INORGANIC CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE AB A series of mixed-valence Cu(I)/Cu(II) linear chain compounds exhibiting pinned charge density waves have been synthesized. The compounds have stoichiometry ACuICuIIX4 with X = Cl or Br and A = tetraethylammonium (TEA), triethylmethylammonium (TEM), or diethyldimethylammonium (DEM). The crystal structures of thc bromide analogues have been determined. The (TEM)Cu2Br4 salt is tetragonal, with space group P4(2)/ncm, a = 10.812 (1) angstrom, c = 13.234 (2) angstrom, V = 1546.9 (4) angstrom3, Z = 4, d(x) = 2.42 g/cm3, and R = 0.0647. The (DEM)Cu2Br4 salt is also tetragonal, with space group P4(2)/ncm, a = 10.523 (1) angstrom, c = 13.1630 (9) angstrom, V = 1457.5 (4) angstrom3, Z = 4, d(x) = 2.50 g/cm3, and R = 0.0974. The (TEA)Cu2Br4 salt is orthorhombic, with space group P2(1)2(1)2(1), a = 11.084 (2) angstrom, b = 19.696 (3) angstrom, c = 21.847 (2) angstrom, V = 4770 (1) angstrom3, Z = 12, d(x) = 2.41 g/cm3, and R = 0.0358. These structures reveal infinite chains of alternating Cu(I)X4(3-) and Cu(II)X4(2-) tetrahedra (distorted) sharing edges, thc chains being effectively isolated by bulky tetraalkylammonium cations. Although the valence states appear to be localized, with a 0.1 angstrom difference in thc Cu(I)-X and Cu(II)-X bond lengths, several characterization techniques indicate Robin and Day class II behavior. The data also support a Peierls 4k(f) distorted charge density wave state for these chains. All salts show an intervalence charge-transfer band in the visible region of the spectrum. Conductivity measurements indicate semiconductive behavior. Temperature-dependent magnetic susceptibility measurements on (TEA)Cu2Br4 reveal weak antiferromagnetic coupling, which is attributed to short Br...Br contacts between Cu(II)X4(2-) species within the chains. The above physical properties are rationalized in light of previous EHMO band calculations. C1 WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI Scott, Brian/D-8995-2017 OI Scott, Brian/0000-0003-0468-5396 NR 34 TC 38 Z9 38 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 EI 1520-510X J9 INORG CHEM JI Inorg. Chem. PD JUN 10 PY 1992 VL 31 IS 12 BP 2483 EP 2492 DI 10.1021/ic00038a034 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HY814 UT WOS:A1992HY81400034 ER PT J AU CHRISTENSEN, K OLAMI, Z AF CHRISTENSEN, K OLAMI, Z TI VARIATION OF THE GUTENBERG-RICHTER B VALUES AND NONTRIVIAL TEMPORAL CORRELATIONS IN A SPRING-BLOCK MODEL FOR EARTHQUAKES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID DYNAMICS; FAULT AB We show that a two-dimensional spring-block model for earthquakes is equivalent to a continuous, nonconservative cellular automaton model. The level of conservation is a function of the relevant elastic parameters describing the model. The model exhibits power law distributions for the energy released during an earthquake. The corresponding exponent is not universal. It is a function of the level of conservation. Thus the observed variation in the b value in the Gutenberg-Richter law could be explained by a variation in the elastic parameters. We address the problem of the boundary conditions and display results for two extreme possibilities. Furthermore, we discuss the correlation in the interoccurrence time of earthquakes. The model exhibits the features of real earthquakes: the occurrence of small earthquakes is random, while the larger earthquakes seem to be bunched. Primarily, the results of our work indicate that the dynamic of earthquakes is intimately related to the nonconservative nature of the model, which gives birth to both the change in the exponent and the correlations in interoccurrence time. RP CHRISTENSEN, K (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,BLDG 510A,UPTON,NY 11973, USA. NR 18 TC 92 Z9 93 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUN 10 PY 1992 VL 97 IS B6 BP 8729 EP 8735 DI 10.1029/92JB00427 PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HZ072 UT WOS:A1992HZ07200001 ER PT J AU TSANG, YW NARASIMHAN, TN AF TSANG, YW NARASIMHAN, TN TI EFFECTS OF PERIODIC ATMOSPHERIC-PRESSURE VARIATION ON RADON ENTRY INTO BUILDINGS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SATURATED-UNSATURATED FLOW; DEFORMABLE POROUS-MEDIA; NUMERICAL-MODEL; AIR-FLOW; SOIL; TRANSPORT; FLUX AB Using a mathematical model, we have investigated the temporal variations of radon entry into a house basement in the presence of time-dependent periodic variations of barometric pressure as well as a persistent small steady depressurization within the basement. The tool for our investigation is an integral finite difference numerical code which can solve for both diffusive and advective flux of radon in the soil gas which is treated as a slightly compressible fluid. Two different boundary conditions at the house basement are considered: (1) a dirt floor basement so that diffusion is equally or more important than advective transport, and (2) an "impermeable" cement basement except for a 1-cm-wide crack near the perimeter of the basement floor; in which case, advective transport of radon flux dominates. Two frequencies of barometric pressure fluctuation with representative values of amplitudes, based on a Fourier decomposition of barometric pressure data, were chosen in this study: one with a short period of 0.5 hour with pressure amplitude of 50 Pa, the other a diurnal variation with a period of 24 hours with the typical pressure amplitude of 250 Pa. For a homogeneous soil medium with soil permeability to air between 10(-13) and 10(-10) m2, we predict that the barometric fluctuations increase the radon entry into the basement by up to 120% of the steady radon inflow into the basement owing to a steady depressurization of 5 Pa. If soil permeability heterogeneity is present, such as the presence of a thin layer of higher permeability aggregate immediately below the basement floor, radon flux due to atmospheric pumping is further increased. Effects of pressure pumping on radon entry are also compared to diffusion-only transport when the steady depressurization is absent. It is found that contribution to radon entry is significant for the basement crack configuration. In particular, for pressure pumping at 0.5-hour period and for a homogeneous medium of permeability of 10(-10) m2, the radon entry is a factor of 10 larger than that predicted by the diffusion-only transport. This may help to explain indoor radon concentrations during times of low steady state driving force. Extending beyond radon transport, the results of this case study establish the importance of transient advective transport resulting from atmospheric pressure variation. These results may have relevance in the estimations of the transfer of trace gases such as methane and nitrous oxide across the soil-atmosphere interface and their impact on global climate changes. RP LAWRENCE BERKELEY LAB, DIV EARTH SCI, BERKELEY, CA 94720 USA. NR 28 TC 19 Z9 19 U1 0 U2 8 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 JUN 10 PY 1992 VL 97 IS B6 BP 9161 EP 9170 DI 10.1029/92JB00707 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HZ072 UT WOS:A1992HZ07200032 ER PT J AU TORRIE, BH VONDREELE, R LARSON, AC AF TORRIE, BH VONDREELE, R LARSON, AC TI STRUCTURE OF SOLID CYANAMIDE AT 13-K SO MOLECULAR PHYSICS LA English DT Article AB The structure of cyanamide ND2CN, was determined at 13 K using Rietveld refinement of neutron powder profiles. The space group was confirmed to be Pbca with 8 molecules in a unit cell with dimensions a = 6.559(2), b = 9.169(2) and c = 6.775(2) angstrom. Molecules are linked in a three dimensional array by hydrogen bonds. A satisfactory model for the observed structure was developed using standard exp-6 potentials for all interactions except D-N which was represented by a modified exp-6 potential, a collection of point charges or a simple attractive exponential potential. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TORRIE, BH (reprint author), UNIV WATERLOO,DEPT PHYS,GUELPH WATERLOO PROGRAM GRAD WORK PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD JUN 10 PY 1992 VL 76 IS 2 BP 405 EP 410 DI 10.1080/00268979200101421 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JB356 UT WOS:A1992JB35600012 ER PT J AU NORMAN, MR AKERA, H MACDONALD, AH AF NORMAN, MR AKERA, H MACDONALD, AH TI MEAN-FIELD SUPERCONDUCTIVITY IN A STRONG MAGNETIC-FIELD SO PHYSICA C LA English DT Article ID VORTEX-CORE AB We have solved the microscopic mean-field equations for a BCS superconductor in a strong magnetic field. Calculations were Performed for fields both above and below the semiclassical upper critical field. In the low-field regime we find small quantum corrections to the results of semiclassical theory, whereas in the reentrant strong-field regime we find that the vortex lattice state changes qualitatively. C1 INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. RP NORMAN, MR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Norman, Michael/C-3644-2013 NR 20 TC 23 Z9 23 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 10 PY 1992 VL 196 IS 1-2 BP 43 EP 47 DI 10.1016/0921-4534(92)90135-Y PG 5 WC Physics, Applied SC Physics GA JB530 UT WOS:A1992JB53000007 ER PT J AU MILLER, PA GREENBERG, KE AF MILLER, PA GREENBERG, KE TI PERIOD-DOUBLING BIFURCATION IN A PLASMA REACTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID CHAOTIC BEHAVIOR; OSCILLATOR AB We describe the response of an industrial plasma reactor to excitation at varying power levels. When the reactor is excited at low power, rf voltage and current waveforms contain components at multiples of the drive frequency (13-56 MHz) due to the plasma's nonlinear impedance. As power is increased, a transition point is reached and the waveforms change. Above the transition power level, signals at the half-harmonic frequency (6.78 MHz) and its multiples are also present, which is indicative of a period-doubling bifurcation. Above and below the bifurcation point, the dc bias and the etch rate behave quite differently. RP MILLER, PA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 20 Z9 20 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 8 PY 1992 VL 60 IS 23 BP 2859 EP 2861 DI 10.1063/1.106847 PG 3 WC Physics, Applied SC Physics GA HX466 UT WOS:A1992HX46600013 ER PT J AU FLEETWOOD, DM AF FLEETWOOD, DM TI LONG-TERM ANNEALING STUDY OF MIDGAP INTERFACE-TRAP CHARGE NEUTRALITY SO APPLIED PHYSICS LETTERS LA English DT Article ID MOS DEVICES; RADIATION; SILICON; TRANSISTORS; GENERATION; SEPARATION; DEFECTS; SYSTEMS; STATES; CMOS AB Non-radiation-hardened metal-oxide-semiconductor (MOS) devices were irradiated to doses from 30 to 90 krad (SiO2) and baked at 100-degrees-C under positive bias for 2.75 yr. Threshold-voltage shifts due to radiation-induced oxide- and interface-trap charge were estimated via the subthreshold current-voltage technique of McWhorter and Winokur [Appl. Phys. Lett. 48, 133 (1986)], which depends on the assumption that radiation-induced interface traps are neutral at midgap surface potential. The oxide-trap charge inferred via this technique asymptotically approached zero approximately 9 months after irradiation and remained constant for the next 2 yr, despite large changes in the subthreshold current-voltage characteristics caused by changes in interface-trap density (which increased during the first 4-9 months of 100-degrees-C annealing, then decreased during the remaining 2-2.5 yr). This strongly reinforces the often controversial idea that radiation-induced interface traps are charge-neutral at midgap. Finally, a new figure of merit is developed to assess the self-consistency of interface-trap charge measurements on irradiated MOS devices. RP FLEETWOOD, DM (reprint author), LOS ALAMOS NATL LAB,DEPT 1332,LOS ALAMOS,NM 87545, USA. NR 33 TC 35 Z9 35 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 JUN 8 PY 1992 VL 60 IS 23 BP 2883 EP 2885 DI 10.1063/1.106807 PG 3 WC Physics, Applied SC Physics GA HX466 UT WOS:A1992HX46600021 ER PT J AU SWIATECKI, WJ AF SWIATECKI, WJ TI A MODIFIED THOMAS-FERMI TREATMENT OF NUCLEI SO NUCLEAR PHYSICS A LA English DT Article AB An improved nuclear Thomas-Fermi theory is studied in which, rather than adding density-gradient corrections to the standard expression for the kinetic energy density (proportional to rho-5/3, where rho is the density) one simply modifies this rho-5/3 function to reflect the fact that the kinetic energy density, becomes negative for small values of rho when, in a typical nuclear problem, one is dealing with the outer fringes of the surface region. The net result of this study is simply stated: in order to find the density associated with a given nuclear potential, one exponentiates this potential instead of raising its depth with respect to the chemical potential to the three-halves power, as in the standard treatment. An improved description of the nuclear surface profile is obtained, including the quantal halo in the classically forbidden region. But since density derivatives are not involved, there is no need to solve a partial differential equation in order to find the density. RP SWIATECKI, WJ (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 6 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 8 PY 1992 VL 542 IS 2 BP 195 EP 207 DI 10.1016/0375-9474(92)90212-3 PG 13 WC Physics, Nuclear SC Physics GA JD551 UT WOS:A1992JD55100002 ER PT J AU ESBENSEN, H BERTSCH, GF AF ESBENSEN, H BERTSCH, GF TI SOFT DIPOLE EXCITATIONS IN LI-11 SO NUCLEAR PHYSICS A LA English DT Article ID NUCLEUS LI-11; NEUTRON HALO; FRAGMENTATION; COULOMB AB A three-body model of Li-11 is extended to include all interactions in unbound states in the continuum. We use a Green function technique to solve the three-body hamiltonian equation, and study the continuum dipole states produced by electromagnetic excitations of the ground state. The final-state interaction modifies the dipole strength function substantially, making it similar to an independent-particle strength function, but the total strength is enhanced by 50% due to ground-state correlations. The dipole strength is concentrated in a peak just above threshold, and the strength distribution is consistent with the measured beam energy dependence of the Coulomb dissociation cross section. This threshold peak also gives a narrow component in the neutron and the residual nucleus momentum distributions. The angular distributions of the neutrons emitted in Coulomb-induced reactions show a surprising anticorrelation, favoring emission with a large opening angle between the directions of the two neutrons in the rest frame of Li-11. C1 MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824. RP ESBENSEN, H (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 24 TC 146 Z9 147 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 8 PY 1992 VL 542 IS 2 BP 310 EP 340 DI 10.1016/0375-9474(92)90219-A PG 31 WC Physics, Nuclear SC Physics GA JD551 UT WOS:A1992JD55100009 ER PT J AU BARGER, V BERGER, MS HAN, T ZRALEK, M AF BARGER, V BERGER, MS HAN, T ZRALEK, M TI TEST OF THE DIMOPOULOS-HALL-RABY ANSATZ FOR FERMION MASS MATRICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOP QUARK AB By evolution of fermion mass matrices of the Fritzsch and the Georgi-Jarlskog forms from the supersymmetric grand unified scale, Dimopoulos, Hall, and Raby obtained predictions for the quark masses and mixings. Using Monte Carlo methods we test these predictions against the latest determinations of the mixings, the CP-violating parameter-epsilon(K), and the B(d)0-B(d)0BAR mixing parameter r(d). The acceptable solutions closely specify the quark mixings, but lie at the edges of allowed regions at 90% confidence level. C1 UNIV SILESIA,DEPT PHYS,KATOWICE,POLAND. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BARGER, V (reprint author), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. NR 27 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 8 PY 1992 VL 68 IS 23 BP 3394 EP 3397 DI 10.1103/PhysRevLett.68.3394 PG 4 WC Physics, Multidisciplinary SC Physics GA HX413 UT WOS:A1992HX41300007 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BLOOM, K BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ETCHEGOYEN, A ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BLOOM, K BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ETCHEGOYEN, A ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LISS, TM LIMON, P LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI MEASUREMENT OF THE RATIO BETA(W-]TAU-NU)/BETA(W-]E-NU) IN P(P)BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID DETECTOR; CDF AB We have observed over 10(2) events of the type W --> tau-v followed by tau --> hadrons, where the taus are identified by their decay into one or three charged particles. We measure the cross section times branching ratio for ppBAR --> W --> tau-v and compare it to the value for W --> ev to directly measure the ratio of weak coupling constants g(tau)/g(e). We find g(tau)/g(e) = 0.97 +/- 0.07, consistent with lepton universality. C1 BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. TUFTS UNIV, MEDFORD, MA 02155 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. UNIV ILLINOIS, URBANA, IL 61801 USA. NATL LAB HIGH ENERGY PHYS, TSUKUBA, IBARAKI 305, JAPAN. UNIV PENN, PHILADELPHIA, PA 19104 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV PADUA, IST NAZL FIS NUCL, I-35131 PADUA, ITALY. UNIV PISA, I-56100 PISA, ITALY. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 30031, JAPAN. TEXAS A&I UNIV, KINGSVILLE, TX 78363 USA. IST NAZL FIS NUCL, PISA, ITALY. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. RUTGERS STATE UNIV, NEW BRUNSWICK, NJ 08903 USA. RP ABE, F (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052 NR 15 TC 25 Z9 25 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 8 PY 1992 VL 68 IS 23 BP 3398 EP 3402 DI 10.1103/PhysRevLett.68.3398 PG 5 WC Physics, Multidisciplinary SC Physics GA HX413 UT WOS:A1992HX41300008 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, G GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A DEBARBARO, P BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B ETCHEGOYEN, A FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, G GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LEWIS, J LI, W LIMON, P LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI MEASUREMENT OF THE BETA-MESON AND B-QUARK CROSS-SECTIONS AT ROOT-S = 1.8 TEV USING THE EXCLUSIVE DECAY BETA+/--]J/PSI-KAPPA+/- SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC COLLISIONS; E+E ANNIHILATION; CDF AB This Letter reports the full reconstruction of B mesons through the decay chain B +/- --> J/psi-K +/-, J/psi --> mu+-mu-, using data obtained at thc Collider Detector at Fermilab in ppBAR collisions at square-root s = 1.8 TeV. This exclusive sample, the first observed at a hadron collider, is then used to measure the B-meson cross section, from which we extract the b-quark cross section. We obtain sigma = 2.8 +/- 0.9(stat) +/- 1.1 (syst) mu-b for B- mesons with P(T) > 9.0 GeV/c and rapidity \y\ < 1.0. We obtain sigma = 6.1 +/- 1.9(stat) +/- 2.4(syst) mu-b for b quarks with transverse momentum P(T) > 11.5 GeV/c and rapidity \y\ < 1.0. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. HARVARD UNIV,CAMBRIDGE,MA 02138. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. TUFTS UNIV,MEDFORD,MA 02155. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. UNIV PENN,PHILADELPHIA,PA 19104. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV PADUA,IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PISA,I-56100 PISA,ITALY. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV WISCONSIN,MADISON,WI 53706. UNIV TSUKUBA,TSUKUBA,IBARAKI 30031,JAPAN. TEXAS A&I UNIV,KINGSVILLE,TX 78363. IST NAZL FIS NUCL,PISA,ITALY. ROCKEFELLER UNIV,NEW YORK,NY 10021. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012; St.Denis, Richard/C-8997-2012 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052; NR 18 TC 40 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 8 PY 1992 VL 68 IS 23 BP 3403 EP 3407 DI 10.1103/PhysRevLett.68.3403 PG 5 WC Physics, Multidisciplinary SC Physics GA HX413 UT WOS:A1992HX41300009 ER PT J AU KNIGHT, CC SOMORJAI, GA AF KNIGHT, CC SOMORJAI, GA TI THE STRUCTURE OF SULFUR OVERLAYERS ON STEPPED MO(910) AND KINKED MO(28,4,1) SINGLE-CRYSTAL SURFACES SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MOLECULAR-SURFACE INTERACTIONS CY OCT 14-15, 1991 CL JULICH, GERMANY ID INDUCED RECONSTRUCTION; FACE AB We have studied the ordered surface structures that develop upon sulfur adsorption on the stepped Mo(910) and kinked Mo(28,4,1) surfaces. The influence of adsorbed sulfur on the terrace width and step height has also been investigated. While the clean Mo(910) and Mo(28,4,1) surfaces have predominantly monatomic height steps, sulfur adsorption leads to a restructuring of the surface through the formation of two atom height steps. On both surfaces, c(2 x 2) and then p(2 x 1) structures form with increasing sulfur coverage. The steps are domain selective for the p(2 x 1) structure. Only those domains with the longer side of the unit cell perpendicular to the step edges are well ordered. This suggests a particularly strong adsorbate-step interaction. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP KNIGHT, CC (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 14 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 8 PY 1992 VL 272 IS 1-3 BP 326 EP 333 DI 10.1016/0039-6028(92)91458-N PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HZ819 UT WOS:A1992HZ81900045 ER PT J AU PARK, SH SHAH, NN TAYLOR, RT DROEGE, MW AF PARK, SH SHAH, NN TAYLOR, RT DROEGE, MW TI BATCH CULTIVATION OF METHYLOSINUS-TRICHOSPORIUM-OB3B .2. PRODUCTION OF PARTICULATE METHANE MONOOXYGENASE SO BIOTECHNOLOGY AND BIOENGINEERING LA English DT Article DE METHANOTROPH; PARTICULATE METHANE MONOOXYGENASE; NITRATE DEPLETION; OPTIMIZATION OF CULTURE CONDITIONS ID METHYLOSINUS-TRICHOSPORIUM OB3B; BACTERIUM VIBRIO-ALGINOLYTICUS; MONO-OXYGENASE; BIODEGRADATION; COPPER; TRICHLOROETHYLENE; OXIDATION AB The obligatory methanotroph, Methylosinus trichosporium OB3b, was studied to optimize the batch culture conditions for the formation of particulate methane monooxygenase (pMMO) in a nitrate minimal salts medium. The important medium components investigated were copper, carbon dioxide, and nitrate. The whole-cell specific pMMO activity decreased sharply with increasing copper concentrations in the range of 10-40-mu-M and remained constant upon further increases of the copper concentration to 120-mu-M. The cell growth rate (mu), on the other hand, decreased over the entire range (10-120-mu-M) of copper concentrations tested. When pMMO was produced in a bioreactor with an optimal initial copper concentration of 10-mu-M. M. trichosporium OB3b exhibited a much faster overall growth rate and a higher whole-cell propene epoxidation activity compared to our earlier study, in which soluble methane monooxygenase (sMMO) was produced with copper-deficient medium. The addition of external carbon dioxide to the bioreactor culture eliminated an initial lag period in the cell growth. When the standard culture medium nitrate concentration (10 mM) was depleted, the pMMO activity, but not the growth rate, decreased rapidly. The whole-cell specific pMMO activity could be maintained by subsequent supplementation of nitrate. A 4-fold higher initial culture medium nitrate concentration of 40 mM, however, resulted in slower cell growth and lower pMMO activity. These observations demonstrate that, in addition to affecting the exclusive production of pMMO, copper also has an important previously unrecognized role in enhancing the growth rate of M. trichosporium OB3b. They also indicate that for the optimal batch production of pMMO with the minimal medium under study, nitrate should be supplied intermittently during the course of cultivation until other culture medium components become growth-limiting. C1 LAWRENCE LIVERMORE NATL LAB,DIV CHEM SCI,LIVERMORE,CA 94550. RP PARK, SH (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,POB 5507,LIVERMORE,CA 94550, USA. NR 21 TC 34 Z9 36 U1 1 U2 14 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3592 J9 BIOTECHNOL BIOENG JI Biotechnol. Bioeng. PD JUN 5 PY 1992 VL 40 IS 1 BP 151 EP 157 DI 10.1002/bit.260400121 PG 7 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HW243 UT WOS:A1992HW24300020 PM 18601056 ER PT J AU GAYEN, S ERMLER, WC AF GAYEN, S ERMLER, WC TI ABINITIO STUDY OF K-ADSORPTION ON A AG(100) SURFACE SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID ALKALI-METAL OVERLAYERS; ELECTRONIC-STRUCTURE; CHEMISORPTION; POTASSIUM AB Ab initio Hartree-Fock calculations are reported for the chemisorption of K on Ag using three different types of clusters to model the system. Geometry optimization is done in 4 degrees of freedom. It is found that since there is an absence of complete charge transfer between the adsorbate and substrate, the interaction can be interpreted as being predominately covalent in nature. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP GAYEN, S (reprint author), STEVENS INST TECHNOL LIB, DEPT CHEM & CHEM ENGN, HOBOKEN, NJ 07030 USA. RI Ermler, Walter/B-6876-2011 NR 41 TC 2 Z9 2 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD JUN 5 PY 1992 VL 42 IS 5 BP 1091 EP 1099 DI 10.1002/qua.560420502 PG 9 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA HP605 UT WOS:A1992HP60500001 ER PT J AU QIAN, YW FRITZ, JS AF QIAN, YW FRITZ, JS TI NEW THIOHYDRAZONES FOR COMPLEXATION AND CHROMATOGRAPHIC DETERMINATION OF METAL-IONS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; 2,6-DIACETYLPYRIDINE; RETENTION AB A general scheme is outlined for rapid determination of metal cations by complexation and subsequent high-performance liquid chromatographic separation. The synthesis and general properties are described for several new thiohydrazone complexing reagents. Solubility considerations suggest that the metal complexes have a positive charge. Excellent chromatographic separations are obtained for mixtures of up to seven metal ion complexes. Addition of a positively charged additive to the eluent is shown to have a significant effect on both the retention times and sharpness of the chromatographic peaks. Separation of the metal complexes on resins with a permanent charge is also shown to be feasible. C1 IOWA STATE UNIV,US DOE,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV,US DOE,AMES LAB,AMES,IA 50011. NR 19 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 5 PY 1992 VL 602 IS 1-2 BP 103 EP 110 DI 10.1016/0021-9673(92)80069-7 PG 8 WC Chemistry, Analytical SC Chemistry GA HZ914 UT WOS:A1992HZ91400016 ER PT J AU MORRIS, J FRITZ, JS AF MORRIS, J FRITZ, JS TI ION CHROMATOGRAPHY OF METAL-CATIONS ON CARBOXYLIC-ACID RESINS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID COMPLEXING AGENTS; SEPARATION AB The goal of the present work is to study cation separations on weak-acid resins that are easily synthesized and carry the exchange group on the crosslinking benzene ring of the resin or on a short spacer arm from the ring. The synthesis and general properties of two carboxylic resins are described. A higher exchange capacity is required for effective ion chromatographic separations than that needed for sulfonated resins. A number of excellent separations are reported using eluents containing ethylenediammonium cations plus a weak complexing agent. The effect of pH on retention times of metal ions is reported. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 9 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 5 PY 1992 VL 602 IS 1-2 BP 111 EP 117 DI 10.1016/0021-9673(92)80070-B PG 7 WC Chemistry, Analytical SC Chemistry GA HZ914 UT WOS:A1992HZ91400017 ER PT J AU MUSKAL, SM KIM, SH AF MUSKAL, SM KIM, SH TI PREDICTING PROTEIN SECONDARY STRUCTURE-CONTENT - A TANDEM NEURAL NETWORK APPROACH SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE SECONDARY STRUCTURE CONTENT; NEURAL NETWORK; MEMORIZATION; PROTEIN STRUCTURE PREDICTION; PROTEIN FOLDING ID MAMMALIAN SERINE PROTEASES; AMINO-ACID-COMPOSITION; GLOBULAR PROTEINS; SEQUENCE; MICROCOMPUTER; IMPROVEMENTS; CHARACTERS; REGIONS; DESIGN C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 45 TC 92 Z9 94 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUN 5 PY 1992 VL 225 IS 3 BP 713 EP 727 DI 10.1016/0022-2836(92)90396-2 PG 15 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX635 UT WOS:A1992HX63500011 PM 1602478 ER PT J AU WERNER, MH WEMMER, DE AF WERNER, MH WEMMER, DE TI IDENTIFICATION OF A PROTEIN-BINDING SURFACE BY DIFFERENTIAL AMIDE HYDROGEN-EXCHANGE MEASUREMENTS - APPLICATION TO BOWMAN-BIRK SERINE-PROTEASE INHIBITOR SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE BOWMAN-BIRK INHIBITOR; BINDING SURFACE; HYDROGEN EXCHANGE; NUCLEAR MAGNETIC RESONANCE ID PANCREATIC TRYPSIN-INHIBITOR; NUCLEAR MAGNETIC-RESONANCE; MOLECULAR-DYNAMICS; SUBTILISIN CARLSBERG; SECONDARY STRUCTURE; NMR-SPECTROSCOPY; COMPLEX; CHYMOTRYPSIN; RESOLUTION; CRYSTAL C1 LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. FU ORS NIH HHS [8SORROS61A] NR 36 TC 26 Z9 26 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUN 5 PY 1992 VL 225 IS 3 BP 873 EP 889 DI 10.1016/0022-2836(92)90407-B PG 17 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX635 UT WOS:A1992HX63500022 PM 1602487 ER PT J AU LOLIS, E SWEET, RM COUSENS, LS TEKAMPOLSON, P SHERRY, BA CERAMI, A AF LOLIS, E SWEET, RM COUSENS, LS TEKAMPOLSON, P SHERRY, BA CERAMI, A TI PRELIMINARY CRYSTALLOGRAPHIC ANALYSIS OF MURINE MACROPHAGE INFLAMMATORY PROTEIN-2 SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE CRYSTALLIZATION; X-RAY DIFFRACTION; MACROPHAGE INFLAMMATORY PROTEIN; INTERLEUKIN-8 ID COLONY FORMATION INVITRO; MACROMOLECULAR CRYSTALLOGRAPHY; 3-DIMENSIONAL STRUCTURE; PROGENITOR CELLS; SYSTEM C1 ROCKEFELLER UNIV,MED BIOCHEM LAB,NEW YORK,NY 10021. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. CHIRON CORP,EMERYVILLE,CA 94608. NR 17 TC 2 Z9 2 U1 0 U2 1 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 JUN 5 PY 1992 VL 225 IS 3 BP 913 EP 915 DI 10.1016/0022-2836(92)90411-C PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HX635 UT WOS:A1992HX63500026 PM 1602491 ER PT J AU GOLDSTEIN, AN ECHER, CM ALIVISATOS, AP AF GOLDSTEIN, AN ECHER, CM ALIVISATOS, AP TI MELTING IN SEMICONDUCTOR NANOCRYSTALS SO SCIENCE LA English DT Article ID SMALL PARTICLES; MOLECULAR-DYNAMICS; SIZE; CLUSTERS; GOLD AB New physics occurs in semiconductors when one or more dimensions of the crystal are reduced to a size comparable to bulk electron delocalization lengths (tens to hundreds of angstroms). The properties of "quantum dots" or semiconductor nanocrystals are now being studied, as techniques to fabricate the crystallites are developed. Temperature-dependent electron diffraction studies on nanocrystals of CdS show a large depression in the melting temperature with decreasing size, as a larger fraction of the total number of atoms is on the surface. Thermal stability may play a role in determining the uses of semiconductor nanocrystals. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, NATL CTR ELECTRON MICROSCOPY, BERKELEY, CA 94720 USA. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 34 TC 766 Z9 779 U1 7 U2 132 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 JUN 5 PY 1992 VL 256 IS 5062 BP 1425 EP 1427 DI 10.1126/science.256.5062.1425 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX337 UT WOS:A1992HX33700028 PM 17791609 ER PT J AU PENNER, JE DICKINSON, RE ONEILL, CA AF PENNER, JE DICKINSON, RE ONEILL, CA TI EFFECTS OF AEROSOL FROM BIOMASS BURNING ON THE GLOBAL RADIATION BUDGET SO SCIENCE LA English DT Article ID CLIMATE AB An analysis is made of the likely contribution of smoke particles from biomass burning to the global radiation balance. These particles act to reflect solar radiation directly; they also can act as cloud condensation nuclei, increasing the reflectivity of clouds. Together these effects, although uncertain, may add up globally to a cooling effect as large as 2 watts per square meter, comparable to the estimated contribution of sulfate aerosols. Anthropogenic increases of smoke emission thus may have helped weaken the net greenhouse warming from anthropogenic trace gases. C1 UNIV ARIZONA,INST ATMOSPHER PHYS,TUCSON,AZ 85721. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Penner, Joyce/J-1719-2012 NR 26 TC 392 Z9 407 U1 8 U2 68 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 5 PY 1992 VL 256 IS 5062 BP 1432 EP 1434 DI 10.1126/science.256.5062.1432 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX337 UT WOS:A1992HX33700031 PM 17791612 ER PT J AU RICHTER, B AF RICHTER, B TI SLAC DEFENDED SO NATURE LA English DT Letter RP RICHTER, B (reprint author), STANFORD LINEAR ACCELERATOR CTR,POB 4349,STANFORD,CA 94309, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 4 PY 1992 VL 357 IS 6377 BP 354 EP 354 DI 10.1038/357354b0 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HX172 UT WOS:A1992HX17200015 ER PT J AU CHAU, LL HUANG, DW AF CHAU, LL HUANG, DW TI ISING FLUCTUATIONS FOR THE INTERMITTENT AND SCALING BEHAVIORS OF HIGH-ENERGY MULTIPARTICLE PRODUCTIONS SO PHYSICS LETTERS B LA English DT Article ID DISTRIBUTIONS; SYSTEMS AB We have derived explicitly the factorial moments in the one-dimensional Ising model on the lattice and shown that they have intermittency. In the continuum limit, we show that the intermittency persists and scaling relations emerge among factorial moments. Multiparticle production in hadronic scatterings are effectively one-dimensional distributions in the rapidity variable. By introducing a parameter relating the lattice sites to experimental rapidity bins, in addition to the two parameters in the Ising model which are fixed by average multiplicity [n] and its dispersion [n2], we can fit the intermittent patterns of multiparticle productions in a few different high energy nuclear scatterings. We also present the nuclear-emulsion data in scaling plots. It will be interesting to further test such intermittency and scaling behavior with more accurate data and in other high energy hadronic particle experiments. C1 LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545. RP CHAU, LL (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 12 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 J9 PHYS LETT B JI Phys. Lett. B PD JUN 4 PY 1992 VL 283 IS 1-2 BP 1 EP 7 DI 10.1016/0370-2693(92)91415-6 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ376 UT WOS:A1992HZ37600001 ER PT J AU TEICHMANN, SG GAZES, SB MASON, JE ROBERTS, RB KIM, HJ AF TEICHMANN, SG GAZES, SB MASON, JE ROBERTS, RB KIM, HJ TI BREAKUP FUSION AS A SOURCE OF PROMPT PROTONS IN LOW-ENERGY SI-28 + MO-98, NI-58 REACTIONS SO PHYSICS LETTERS B LA English DT Article ID EMISSION; PARTICLES AB Prompt protons emitted in low-energy Si-28+Mo-98, Ni-58 reactions were measured in coincidence with evaporation residues using a velocity filter. The proton energy spectra are found to be sensitive to the residue mass. Mass-gated spectra at forward angles show non-statistical protons characterized by a high-energy bump. A simple Serber-like model for breakup-fusion reproduces the data well. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP TEICHMANN, SG (reprint author), UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 4 PY 1992 VL 283 IS 1-2 BP 37 EP 41 DI 10.1016/0370-2693(92)91422-6 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA HZ376 UT WOS:A1992HZ37600008 ER PT J AU JELINEK, R OZKAR, S OZIN, GA AF JELINEK, R OZKAR, S OZIN, GA TI EXTRAFRAMEWORK SODIUM-CATION SITES IN SODIUM ZEOLITE-Y PROBED BY NA-23 DOUBLE-ROTATION NMR SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 UNIV TORONTO,LASH MILLER CHEM LABS,ADV ZEOLITE MAT SCI GRP,80 ST GEORGE ST,TORONTO M5S 1A1,ONTARIO,CANADA. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. OI jelinek, raz/0000-0002-0336-1384 NR 10 TC 23 Z9 23 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 3 PY 1992 VL 114 IS 12 BP 4907 EP 4908 DI 10.1021/ja00038a068 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HX815 UT WOS:A1992HX81500068 ER PT J AU PANG, Y SCHNEIDER, A BARTON, TJ GORDON, MS CARROLL, MT AF PANG, Y SCHNEIDER, A BARTON, TJ GORDON, MS CARROLL, MT TI SYNTHESIS AND STRUCTURE OF A TETRASILACYCLOHEXYNE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID RING CYCLIC ALKYNES; CYCLOHEXYNE C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. N DAKOTA STATE UNIV, DEPT CHEM, FARGO, ND 58105 USA. NR 22 TC 20 Z9 21 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 3 PY 1992 VL 114 IS 12 BP 4920 EP 4921 DI 10.1021/ja00038a077 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HX815 UT WOS:A1992HX81500077 ER PT J AU THOR, AD MOORE, DH EDGERTON, SM KAWASAKI, ES REIHSAUS, E LYNCH, HT MARCUS, JN SCHWARTZ, L CHEN, LC MAYALL, BH SMITH, HS AF THOR, AD MOORE, DH EDGERTON, SM KAWASAKI, ES REIHSAUS, E LYNCH, HT MARCUS, JN SCHWARTZ, L CHEN, LC MAYALL, BH SMITH, HS TI ACCUMULATION OF P53 TUMOR SUPPRESSOR GENE PROTEIN - AN INDEPENDENT MARKER OF PROGNOSIS IN BREAST CANCERS SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Article ID MUTATIONS; EXPRESSION; TRANSFORMATION; ANTIBODIES; SARCOMAS; ONCOGENE; ANTIGEN; 17P13 AB Background: Mutations of the tumor suppressor gene p53 have been identified in breast cancer cell fines, and some breast carcinomas are detectable by immunohistochemical assay because of p53 protein accumulation. Purpose: This study was designed to determine whether p53 protein accumulation in breast cancers correlates with p53 gene mutation, with survival, and with five pathobiologic factors associated with prognosis. Methods: IgG1 monoclonal antibody to human p53 protein (PAb 1801) and immunohistochemical methods were used to detect p53 protein accumulation in archival formalin-fixed, paraffin-embedded, randomly selected carcinomas. We studied 295 invasive ductal carcinomas from the Massachusetts General Hospital; 151 were determined to be sporadic (not hereditary). We also studied 97 invasive ductal carcinomas-21 sporadic and 76 familial (hereditary)-from Creighton University. In addition, we examined 31 archival in situ carcinomas, 15 snap-frozen invasive ductal carcinomas, primary cell cultures from three benign breast tissue samples, and breast carcinoma cell lines MDA-MB-231 and MDA-MB-468. Results: Nuclear p53 protein was observed in 16% of the 31 in situ carcinomas, 22% of the 172 sporadic carcinomas, 34% of the 50 tumors from patients with familial breast cancer, 52% of the 23 tumors from patients with the familial breast and ovarian cancer syndrome, and all three tumors from two patients with the Li-Fraumeni syndrome. There was complete concordance between p53 gene mutation and p53 protein accumulation in the 15 snap-frozen carcinomas and in both breast carcinoma cell lines. Statistically significant associations of p53 protein accumulation with estrogen receptor negativity and with high nuclear grade were found. There were statistically significant associations, independent of other prognostic factors, between p53 protein accumulation and metastasis-free and overall survival, for randomly accrued and for both sporadic and familial tumors. Conclusions: Immunohistochemically detected p53 protein accumulation was an independent marker of shortened survival and was seen more often in familial than in sporadic carcinomas. Our findings also suggest a correlation between p53 protein accumulation and p53 gene mutation. C1 MASSACHUSETTS GEN HOSP,DEPT RADIAT MED,BOSTON,MA 02114. HARVARD UNIV,SCH MED,BOSTON,MA 02115. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. CETUS CORP,DEPT HUMAN GENET,EMERYVILLE,CA 94608. CREIGHTON UNIV,DEPT PREVENT MED & PATHOL,OMAHA,NE 68178. CALIF PACIFIC MED CTR,GERALDINE BRUSH CANC RES INST,SAN FRANCISCO,CA. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. RP THOR, AD (reprint author), MASSACHUSETTS GEN HOSP,DEPT PATHOL,WARREN 2,FRUIT ST,BOSTON,MA 02114, USA. FU NCI NIH HHS [CA-44768, CA-48802] NR 49 TC 785 Z9 791 U1 3 U2 16 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD JUN 3 PY 1992 VL 84 IS 11 BP 845 EP 855 DI 10.1093/jnci/84.11.845 PG 11 WC Oncology SC Oncology GA HW636 UT WOS:A1992HW63600009 PM 1317462 ER PT J AU TANG, PTP AF TANG, PTP TI TABLE-DRIVEN IMPLEMENTATION OF THE EXPM-1 FUNCTION IN IEEE FLOATING-POINT ARITHMETIC SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE ALGORITHMS; ERROR ANALYSIS; EXPONENTIAL FUNCTION; IEEE ARITHMETIC; IMPLEMENTATION AB Algorithms and implementation details for the function e(x) - 1 in both single and double precision of IEEE 754 arithmetic are presented here. With a table of moderate size, the implementations need only working-precision arithmetic and are provably accurate to within 0.58 ulp. RP TANG, PTP (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 14 Z9 14 U1 0 U2 1 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD JUN PY 1992 VL 18 IS 2 BP 211 EP 222 DI 10.1145/146847.146928 PG 12 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA LQ591 UT WOS:A1992LQ59100010 ER PT J AU OLANDER, DR ELSAIED, UM AF OLANDER, DR ELSAIED, UM TI THE EFFECT OF GRAIN-BOUNDARY MOTION ON THE KINETICS OF SOLUTE PENETRATION INTO A POLYCRYSTALLINE MEDIUM SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID DIFFUSION AB An approximate computational scheme that accounts for boundary movement during diffusion of a surface-deposited tracer into a polycrystalline solid is presented. The method is compared to exact solutions for stationary boundaries and for rapidly-moving boundaries and found to be acceptably accurate. The proposed method bridges the transition between these two limiting cases. When applied to existing data for tracer diffusion into polycrystalline lead. the tracer grain boundary diffusivity is found to be approximately 5 times larger than the value deduced for stationary-boundary theories. The importance of measuring grain growth during the diffusion experiments is noted. C1 UNIV CALIF BERKELEY, DEPT NUCL ENGN, BERKELEY, CA 94720 USA. RP OLANDER, DR (reprint author), LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1992 VL 40 IS 6 BP 1329 EP 1336 DI 10.1016/0956-7151(92)90434-G PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HW524 UT WOS:A1992HW52400025 ER PT J AU OKADA, H TAMURA, T RAMAKRISHNAN, N ATLURI, SN EPSTEIN, JS AF OKADA, H TAMURA, T RAMAKRISHNAN, N ATLURI, SN EPSTEIN, JS TI ANALYSIS OF TOUGHENING OF MAGNESIA PARTIALLY-STABILIZED ZIRCONIA, DUE TO DILATATIONAL TRANSFORMATION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID CERAMICS; STRENGTH; ZRO2 AB An analysis of toughening of magnesia partially stabilized zirconia (Mg-PSZ) due to dilatational transformation is presented in this paper. Transformation toughening of Mg-PSZ is attributed to the stress-induced phase transformation of tetragonal zirconia to monoclinic structure in the neighborhood of a macro-crack tip. A rate (incremental) type constitutive model is developed, using a micromechanics approach, wherein the interaction between a transformed zirconia particle and the rest of the material is considered. Problems of stationary and stably propagating cracks are analyzed, using a finite element method. The results of finite element analysis are compared to those of an experimental study by Perry el al. In the comparison, it is found that the displacement field and toughness enhancement during stable crack propagation, predicted by the finite element analysis, are very analogous to those obtained in the experimental study. Moreover, the present constitutive model is capable of revealing detailed information, such as the distribution of transformed zirconia in the wake zone. C1 IDAHO NATL ENGN LAB, FRACTURE BEHAV GRP, IDAHO FALLS, ID 83415 USA. RP OKADA, H (reprint author), GEORGIA INST TECHNOL, CTR COMPUTAT MODELING & INFRASTRUCT REHABIL, ATLANTA, GA 30332 USA. RI Atluri, Satya/C-5040-2013 OI Atluri, Satya/0000-0001-6793-9619 NR 24 TC 14 Z9 15 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1992 VL 40 IS 6 BP 1421 EP 1432 DI 10.1016/0956-7151(92)90444-J PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HW524 UT WOS:A1992HW52400035 ER PT J AU BJORKEN, JD AF BJORKEN, JD TI HOW BLACK IS A CONSTITUENT QUARK SO ACTA PHYSICA POLONICA B LA English DT Article ID MULTIPARTICLE PRODUCTION; HEAVY MESONS; COLLISIONS; MODEL; PP AB We review the question posed in the title, with emphasis on hard-collision phenomena utilizing rapidity gaps and jets as a diagnostic. If constituent quarks are very black, it is conceivable that various exotic phenomena exist, including production of strange matter, disoriented chiral condensate, and/or ultra-hot quark-gluon plasma. RP BJORKEN, JD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 34 TC 54 Z9 54 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD JUN PY 1992 VL 23 IS 6 BP 637 EP 653 PG 17 WC Physics, Multidisciplinary SC Physics GA HY778 UT WOS:A1992HY77800012 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI A NOVEL TOOL FOR SURFACE ELECTRONIC-STRUCTURE CALCULATIONS - INSIGHT INTO SURFACE SELF-DIFFUSION ON METALS SO ADVANCED MATERIALS LA English DT Article ID VACANCY FORMATION ENERGIES; ATOMIC EXCHANGE MECHANISM; CORE-LEVEL SHIFTS; SEGREGATION; ADSORBATE; CRYSTAL; ADATOM; HEATS AB The diffusion of adatom clusters on surfaces and the nature and energetics of diffusion across a step are crucial in the synthesis of tailored materials, for example growing a structure involving atom A on substrate B. A recently developed method enables the study of such diffusion including concerted substitution diffusion, the mode in which atom A dives into the surface replacing atom B (see figure). The various aspects of the new method are presented. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS, DIV SURFACE & INTERFACE SCI, ALBUQUERQUE, NM 87185 USA. NR 23 TC 2 Z9 2 U1 0 U2 0 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 101161, 69451 WEINHEIM, GERMANY SN 0935-9648 EI 1521-4095 J9 ADV MATER JI Adv. Mater. PD JUN PY 1992 VL 4 IS 6 BP 396 EP 401 DI 10.1002/adma.19920040604 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA JB802 UT WOS:A1992JB80200003 ER PT J AU DEMUTH, SF COUNCE, RM AF DEMUTH, SF COUNCE, RM TI ZIRCONIUM TRANSPORT DYNAMICS IN THE PUREX SOLVENT-EXTRACTION PROCESS SO AICHE JOURNAL LA English DT Article AB The primary objective of this study was to develop and validate experimental and mathematical procedures that can be used to determine the fundamental mechanisms of the Purex (plutonium and uranium) extraction process. The mechanisms of this solvent extraction process have been established by classical chemical engineering principles. In the past, modeling of transport phenomena for the solvent extraction of spent nuclear fuel by the Purex process has typically (1) relied solely on diffusion, (2) relied solely on chemical reaction, (3) combined diffusion and chemical reaction in a semiempirical fashion, or (4) combined diffusion and chemical reaction in a nonclassical chemical engineering manner. This study was conducted with the single Purex species, aqueous Zr4+, to simplify the chemistry and modeling mathematics. The validated procedures and model are applicable to most all Purex species. C1 UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. RP DEMUTH, SF (reprint author), LOS ALAMOS NATL LAB,POB 1663,MS K560,LOS ALAMOS,NM 87545, USA. NR 23 TC 0 Z9 0 U1 1 U2 6 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD JUN PY 1992 VL 38 IS 6 BP 801 EP 810 DI 10.1002/aic.690380602 PG 10 WC Engineering, Chemical SC Engineering GA HZ551 UT WOS:A1992HZ55100001 ER PT J AU SANTELLA, ML AF SANTELLA, ML TI A REVIEW OF TECHNIQUES FOR JOINING ADVANCED CERAMICS SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article ID SILICON-NITRIDE; FILLER METAL; ALUMINA; MECHANISM; NICKEL RP SANTELLA, ML (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 53 TC 56 Z9 62 U1 4 U2 8 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD JUN PY 1992 VL 71 IS 6 BP 947 EP 954 PG 8 WC Materials Science, Ceramics SC Materials Science GA HY857 UT WOS:A1992HY85700009 ER PT J AU HECHT, NL GOODRICH, SM MCCULLUM, DE YANEY, PP JANG, SD TENNERY, VJ AF HECHT, NL GOODRICH, SM MCCULLUM, DE YANEY, PP JANG, SD TENNERY, VJ TI CHARACTERIZATION STUDIES OF TRANSFORMATION-TOUGHENED CERAMICS SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article ID TETRAGONAL ZIRCONIA POLYCRYSTALS; PARTIALLY-STABILIZED ZIRCONIA; WATER; ZRO2 AB The goal of this study was to characterize transformation-toughened zirconia ceramics and determine the effect of environment on strength and crystal phases. Eight commercial ceramics and three laboratory-prepared high-purity ZrO2 specimens containing 2, 3, and 4 mol% Y2O3 were used for this investigation. The effects of exposure to temperatures ranging from 150-degrees-C to 800-degrees-C in varying atmospheric conditions (aging) on the crystal phases of the toughened ceramics were evaluated. Four-point flexural strength measurements were made at several selected stressing rates and temperatures (25-degrees to 1050-degrees-C) in dry N2 and N2 with 10 vol% H2O. X-ray diffraction was used to evaluate phase changes during low-temperature aging. The toughened ceramics showed premature tetragonal-to-monoclinic phase transformation caused by low-temperature aging. The magnitude of the aging effect depended on the environment and the chemical composition and microstructure of the ceramic. The flexural strengths measured for the eight commercial ceramics at 25-degrees-C were two and three times those reported for nontoughened ZrO2 and Al2O3 ceramics. At 1050-degrees-C, flexural strength decreased 52% to 72% from values found at 25-degrees-C. Flexural strength values among the eight toughened commercial ceramics also showed considerable variation. C1 KOREA ADV INST SCI & TECHNOL, SEOUL 131, SOUTH KOREA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. RP UNIV DAYTON, DAYTON, OH 45419 USA. NR 22 TC 6 Z9 6 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 600 N CLEVELAND AVE, WESTERVILLE, OH 43082 USA SN 0002-7812 EI 1945-2705 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD JUN PY 1992 VL 71 IS 6 BP 955 EP 959 PG 5 WC Materials Science, Ceramics SC Materials Science GA HY857 UT WOS:A1992HY85700010 ER PT J AU YANG, YM DONNELL, C WILBORN, W GOODMAN, SR FILES, B MOORE, RB MOHANDAS, N MANKAD, VN AF YANG, YM DONNELL, C WILBORN, W GOODMAN, SR FILES, B MOORE, RB MOHANDAS, N MANKAD, VN TI SPLENIC SEQUESTRATION ASSOCIATED WITH SICKLE-CELL TRAIT AND HEREDITARY SPHEROCYTOSIS SO AMERICAN JOURNAL OF HEMATOLOGY LA English DT Article DE SPLENIC SEQUESTRATION; SICKLE TRAIT; HEREDITARY SPHEROCYTOSIS ID DISEASE AB Coexistence of sickle cell trait and hereditary spherocytosis (HS) is unusual, and only 16 cases have been reported in the literature. These patients have the same clinical and hematological features as individuals having HS alone. We report a serious complication, acute splenic sequestration crisis (ASSC), occurring in two patients with sickle cell trait and HS. One patient experienced four episodes of ASSC during an 11-year span, while the other had two episodes of this complication during a 4-year period. Red blood cell studies and membrane protein analysis confirmed the diagnosis of HS as a consequence of spectrin deficiency. Splenectomy resulted in marked clinical and hematological improvement in both patients. Histological examination of spleens following splenectomy confirmed that significant erythrostasis and sickling had indeed occurred. ASSC can occur in patients with coexistence of sickle cell trait and HS, and this potentially life-threatening complication should be considered in this condition. C1 UNIV SO ALABAMA,DEPT PATHOL,MOBILE,AL 36617. UNIV SO ALABAMA,CTR ELECTRON MICROSCOPY,MOBILE,AL 36617. UNIV SO ALABAMA,CTR COMPREHENS SICKLE CELL,MOBILE,AL 36617. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. UNIV SO ALABAMA,DEPT STRUCT & CELLULAR BIOL,MOBILE,AL 36617. RP YANG, YM (reprint author), UNIV SO ALABAMA,MED CTR,DEPT PEDIAT,2451 FILLINGIM ST,MOBILE,AL 36617, USA. FU NHLBI NIH HHS [HL 31579] NR 23 TC 21 Z9 21 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0361-8609 J9 AM J HEMATOL JI Am. J. Hematol. PD JUN PY 1992 VL 40 IS 2 BP 110 EP 116 DI 10.1002/ajh.2830400207 PG 7 WC Hematology SC Hematology GA HU705 UT WOS:A1992HU70500006 PM 1585908 ER PT J AU JOHNSON, NF HOOVER, MD THOMASSEN, DG CHENG, YS DALLEY, A BROOKS, AL AF JOHNSON, NF HOOVER, MD THOMASSEN, DG CHENG, YS DALLEY, A BROOKS, AL TI INVITRO ACTIVITY OF SILICON-CARBIDE WHISKERS IN COMPARISON TO OTHER INDUSTRIAL FIBERS USING 4 CELL-CULTURE SYSTEMS SO AMERICAN JOURNAL OF INDUSTRIAL MEDICINE LA English DT Article DE SILICON CARBIDE; CONTINUOUS GLASS FILAMENTS; UICC SAMPLES; FIBER TOXICITY; OCCUPATIONAL EXPOSURES ID TRACHEAL EPITHELIAL-CELLS; RATS; ASBESTOS; WORKERS; INHALATION; MORTALITY; EXPOSURE; COHORT; LONG AB Silicon carbide whiskers (SiCW) and continuous glass filaments are important components of composite materials having potentially widespread use in the automotive, aerospace, and power generation industries. We determined the in vitro activity of three well-characterized samples of silicon carbide whiskers and a continuous glass filament sample in four different cellular assays and compared this to the activities of UICC crocidolite, JM Code 100 glass microfiber, and erionite in the same assay systems. The SiCW had a diameter range of 0.32-0.75-mu-m and a length range of 4.5-20.1-mu-m. The SiCW was significantly toxic; on a mass basis, one SiCW sample was more toxic than crocidolite; however, JM Code 100 glass microfiber, which is not toxic in vivo (i.e., it does not cause fibrogenesis or carcinogenesis when inhaled), was also more toxic than crocidolite. The glass filament sample was the least cytotoxic of all the samples tested. On a fiber number basis, all three SiCW samples were more toxic than crocidolite. The results of our study showed that SiCW exhibits significant in vitro biological reactivity. Thus, despite the caution that must be exercised in extrapolating the results of in vitro studies to conclusions about in vivo health effects, SiCW should be considered toxic until further toxicological data are available. C1 PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. RP JOHNSON, NF (reprint author), LOVELACE BIOMED & ENVIRONM RES INST, INHALAT TOXICOL RES INST, POB 5890, ALBUQUERQUE, NM 87185 USA. RI Hoover, Mark/I-4201-2012 OI Hoover, Mark/0000-0002-8726-8127 NR 41 TC 21 Z9 21 U1 1 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0271-3586 J9 AM J IND MED JI Am. J. Ind. Med. PD JUN PY 1992 VL 21 IS 6 BP 807 EP 823 DI 10.1002/ajim.4700210604 PG 17 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA HV345 UT WOS:A1992HV34500003 PM 1320327 ER PT J AU MCCRAY, PB BETTENCOURT, JD BASTACKY, J AF MCCRAY, PB BETTENCOURT, JD BASTACKY, J TI SECRETION OF LUNG FLUID BY THE DEVELOPING FETAL-RAT ALVEOLAR EPITHELIUM IN ORGAN-CULTURE SO AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY LA English DT Article ID ION-TRANSPORT; BIOELECTRIC PROPERTIES; TRACHEAL EPITHELIUM; SUBMERSION CULTURE; CELL MONOLAYERS; LIQUID; ADULT; LAMB; ABSORPTION; SODIUM AB We studied lung explants in submersion organ culture to examine the role of the developing fetal alveolar epithelium in the production of lung fluid. Fourteen-day-gestation fetal rat lungs were grown in a collagen gel matrix supplemented with F-12 media and 10% fetal calf serum. In this model, the lung continues to grow, secrete fluid, and become progressively cystic in morphology. There is gradual thinning of the distal epithelial layer, which is lined by alveolar type II cells and their precursors. After 6 to 8 days in culture, we impaled the cyst walls with a microelectrode and continuously recorded the transepithelial potential (psi(t)). Stable, baseline transepithelial potentials of -1.1 to -6.2 mV (mean +/- SEM = -3.3 +/- 0.11 mV, lumen negative, n = 34) were measured in bicarbonate-buffered Ringer's solution, suggesting active electrolyte transport. When bumetanide, an inhibitor of chloride secretion in other systems, was added to the bathing solution, psi(t) decreased from a baseline of -3.5 +/- 0.07 mV (mean +/- SEM) to a value of -2.2 +/- 0.07 mV, suggesting chloride transport contributes to the voltage (n = 18, P < 0.0005). Isoproterenol hyperpolarized psi(t) from a baseline of -4.3 +/- 1.0 mV to -6.5 +/- 1.0 mV (n = 7, P < 0.005). 8-(4-Chlorophenylthio) adenosine 3':5'cyclic monophosphate (CPT-cAMP) plus isobutylmethylxanthine (IBMX) similarly hyperpolarized psi(t) from a baseline of -4.6 +/- 0.4 mV to -7.3 +/- 0.7 mV (n = 11, P < 0.005). Addition of bumetanide after stimulation with isoproterenol or CPT-cAMP/IBMX depolarized psi(t). Bath chloride was replaced with gluconate to further test the hypothesis,that the change in psi(t) in response to isoproterenol was due to chloride transport. In Cl- free solution, baseline psi(t) decreased and there was no significant change in psi(t) in response to isoproterenol. These findings suggest: (1) the developing fetal alveolar epithelium actively produces lung fluid by a process that is chloride dependent, (2) chloride secretion can be stimulated by a beta-adrenergic agonist, and (3) chloride secretion is mediated in part through cAMP-dependent pathways. C1 CHILDRENS HOSP OAKLAND,DEPT PULM,OAKLAND,CA. CHILDRENS HOSP OAKLAND,RES INST,OAKLAND,CA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL 40521, HL 33009, HL 45679] NR 29 TC 15 Z9 15 U1 0 U2 1 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 1044-1549 J9 AM J RESP CELL MOL JI Am. J. Respir. Cell Mol. Biol. PD JUN PY 1992 VL 6 IS 6 BP 609 EP 616 PG 8 WC Biochemistry & Molecular Biology; Cell Biology; Respiratory System SC Biochemistry & Molecular Biology; Cell Biology; Respiratory System GA HY984 UT WOS:A1992HY98400007 PM 1317192 ER PT J AU DENNIS, ML SODERSTROM, EJ AF DENNIS, ML SODERSTROM, EJ TI A REJOINDER TO GELLER AND CRABB SO AMERICAN PSYCHOLOGIST LA English DT Letter C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. RP DENNIS, ML (reprint author), RES TRIANGLE INST,RES TRIANGLE PK,NC 27709, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0003-066X J9 AM PSYCHOL JI Am. Psychol. PD JUN PY 1992 VL 47 IS 6 BP 816 EP 817 DI 10.1037//0003-066X.47.6.816 PG 2 WC Psychology, Multidisciplinary SC Psychology GA HY514 UT WOS:A1992HY51400018 ER PT J AU LEE, TT YEUNG, ES AF LEE, TT YEUNG, ES TI COMPENSATING FOR INSTRUMENTAL AND SAMPLING BIASES ACCOMPANYING ELECTROKINETIC INJECTION IN CAPILLARY ZONE ELECTROPHORESIS SO ANALYTICAL CHEMISTRY LA English DT Article ID MICELLAR SOLUTIONS; SEPARATION; CHROMATOGRAPHY; QUANTITATION AB The quantitative precision in capillary zone electrophoresis (CZE) with electrokinetic injection can be improved by proper correction with the integrated current during injection. By monitoring the electrophoretic current during separation, one can also correct for temporal fluctuations in the analyte migration velocity. A model based on field-amplified capillary electrophoresis is used to describe the electrokinetic injection process involving sample solutions with distinct conductivities, and an equation is developed to allow normalization of peak areas at the 0-5% level without the need of quantitative internal standardization. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 28 TC 51 Z9 52 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUN 1 PY 1992 VL 64 IS 11 BP 1226 EP 1231 DI 10.1021/ac00035a007 PG 6 WC Chemistry, Analytical SC Chemistry GA HX003 UT WOS:A1992HX00300008 ER PT J AU OTOOLE, RP BURNS, SG BASTIAANS, GJ PORTER, MD AF OTOOLE, RP BURNS, SG BASTIAANS, GJ PORTER, MD TI THIN ALUMINUM NITRIDE FILM RESONATORS - MINIATURIZED HIGH-SENSITIVITY MASS SENSORS SO ANALYTICAL CHEMISTRY LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; QUARTZ CRYSTAL MICROBALANCE; ACOUSTIC-WAVE SENSORS; STRUCTURAL CHARACTERIZATION; POLYMER-FILMS; SURFACE; MONOLAYERS; LIQUID; DEVICES AB A miniaturized piezoelectric mass sensor has been developed that displays a very high mass sensitivity, S(m). The sensor is based upon thin film resonator (TFR) technology, 1 which is used to produce a gold-coated thin film (5.5-mu-m) resonator (TFR) of piezoelectric aluminum nitride in the shape of 400-mu-m squares. At this thickness, the TFRs support a standing bulk acoustic wave in a longitudinal mode at frequencies of approximately 1 GHz. Coatings of poly(methyl methacrylate) and spontaneously adsorbed monolayers from alkanethiols (CH3-(CH2)nSH, n = 3, 17) were used for the evaluation of S(m). Results indicated that the S(m)(approximately -550 cm2/g) of the TFRs rivals those of the most sensitive mass sensors currently available, while offering such performance in a markedly smaller device. Coatings were also used to sorb a gaseous analyte (i.e. methanol) at the TFRs to test their potential as gas-phase sensors. Tests conducted using monolayers formed by the chemisorption of a fluorinated thiol (CF3(CF2)7(CH2)2-SH) and an acid-terminated thiol (HO2C(CH2)15SH) at the gold electrodes demonstrated both the performance of the TFRs and a primitive manipulation of the sorption selectivity of the interfacial structure. Possible applications of the TFRs as mass sensors are examined based upon their high mass sensitivity and compatibility for device integration using semiconductor processing technology. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE,AMES LAB,DEPT ELECT ENGN & COMP ENGN, MICROELECTR RES CTR, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. NR 51 TC 39 Z9 40 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD JUN 1 PY 1992 VL 64 IS 11 BP 1289 EP 1294 DI 10.1021/ac00035a017 PG 6 WC Chemistry, Analytical SC Chemistry GA HX003 UT WOS:A1992HX00300018 ER PT J AU DOBSON, JE AF DOBSON, JE TI SPATIAL LOGIC IN PALEOGEOGRAPHY AND THE EXPLANATION OF CONTINENTAL-DRIFT SO ANNALS OF THE ASSOCIATION OF AMERICAN GEOGRAPHERS LA English DT Article DE PALEOGEOGRAPHY; CONTINENTAL DRIFT; PLATE TECTONICS; SPATIAL LOGIC; LITHOSPHERE; ASTHENOSPHERE ID PLATE MOTION; TECTONICS; SUPERCONTINENT; GONDWANA; TERRANES AB The scientific methods employed in paleogeography have followed two distinct logics. Spatial logic accepts morphology, spatial distribution, and spatial association as primary evidence of earth processes that must be tested through process-oriented research. Process logic accepts contemporary knowledge about individual earth processes, synthesizes general theory, and proposes spatial tests. Wegener's argument for continental drift, based on spatial logic, was rejected by most scientists from 1912 to 1960. Arguments for sea-floor spreading and plate tectonics, based on spatial logic, were accepted by most scientists from the 1960s to the present. Since the 1960s, process logic has dominated the search for mechanisms causing plate tectonics. Extension of spatial logic in this research finds previously undocumented continental fits among South America and Africa, South America and North America, and North America and Australia. This evidence suggests a new theoretical model of continental drift and plate tectonics, with circular plate motion caused by thermal convection and lateral plate motion caused by gravity. RP DOBSON, JE (reprint author), OAK RIDGE NATL LAB,DIV COMP & TELECOMMUN,POB 2008,OAK RIDGE,TN 37831, USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 74 TC 15 Z9 15 U1 0 U2 8 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0004-5608 J9 ANN ASSOC AM GEOGR JI Ann. Assoc. Am. Geogr. PD JUN PY 1992 VL 82 IS 2 BP 187 EP 206 DI 10.1111/j.1467-8306.1992.tb01904.x PG 20 WC Geography SC Geography GA HZ184 UT WOS:A1992HZ18400001 ER PT J AU BALDI, F CLARK, T POLLACK, SS OLSON, GJ AF BALDI, F CLARK, T POLLACK, SS OLSON, GJ TI LEACHING OF PYRITES OF VARIOUS REACTIVITIES BY THIOBACILLUS-FERROOXIDANS SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article AB Wide variations were found in the rate of chemical and microbiological leaching of iron from pyritic materials from various sources. Thiobacillus ferrooxidans accelerated leaching of iron from all of the pyritic materials tested in shake flask suspensions at loadings of 0.4% (wt/vol) pulp density. The most chemically reactive pyrites exhibited the fastest bioleaching rates. However, at 2.0% pulp density, a delay in onset of bioleaching occurred with two of the pyrites derived from coal sources. T. ferrooxidans was unable to oxidize the most chemically reactive pyrite at 2.0% pulp density. No inhibition of pyrite oxidation by T. ferrooxidans occurred with mineral pyrite at 2.0% pulp density. Experiments with the most chemically reactive pyrite indicated that the leachates from the material were not inhibitory to iron oxidation by T. ferrooxidans. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. UNIV SIENA,DIPARTIMENTO BIOL AMBIENTALE,I-53100 SIENNA,ITALY. NR 18 TC 33 Z9 33 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD JUN PY 1992 VL 58 IS 6 BP 1853 EP 1856 PG 4 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA HX945 UT WOS:A1992HX94500009 PM 16348718 ER PT J AU Imai, T Slichter, CP Paulikas, AP Veal, B AF Imai, T. Slichter, C. P. Paulikas, A. P. Veal, B. TI Low Field (63)Cu NMR Study of Indirect Nuclear Spin-Spin Coupling in YBa(2)Cu(3)O(6.9). A New Approach to Probe Strong Correlation Effects in High-T(c) Superconductors SO APPLIED MAGNETIC RESONANCE LA English DT Article AB The authors carried out a low field (6.3 kOe) NMR measurement of the Gaussian component of (63)Cu nuclear spin-spin relaxation rate 1/T(2G) at the planar Cu site in a high-T(c) superconductor YBa(2)Cu(3)O(6.9) (T(c) = 92 K). They demonstrate that the results provide quantitative information concerning the static spin susceptibility chi' (q) at non-zero wave vector q. The detailed analysis of the data assuming a model susceptibility peaked at the corner of first Brillouin zone q = Q (Q = (pi/a, pi/a), a: lattice constant) shows that chi'(q) satisfies a Curie-Weiss law around q = Q. Stoner enhancement over the calculated Lindhard function at q = Q is estimated to be of the order of similar to 0-20. They also demonstrate that combined analysis of 1/T(1) and 1/T(2G) allows one to judge whether anomalous shift of the low frequency spectral weight of chi ''(Q,omega) to higher frequencies (i.e. pseudo gap) exists or not. Application of the method to YBa(2)Cu(3)O(6.9) revealed no appreciable pseudo gap in the material. C1 [Imai, T.; Slichter, C. P.; Veal, B.] Univ Illinois, Sci & Technol Ctr Superconduct, Urbana, IL 61801 USA. [Imai, T.; Slichter, C. P.] Univ Illinois, Dept Phys, Urbana, IL 61801 USA. [Slichter, C. P.] Univ Illinois, Dept Chem, Urbana, IL 61801 USA. [Slichter, C. P.] Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA. [Paulikas, A. P.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Slichter, CP (reprint author), Univ Illinois Urbana Champaign, 1110 W Green St, Urbana, IL 61801 USA. FU U.S. National Science Foundation through the Science and Technotogy Center for Superconductivity [DMR-88-09854]; U.S. department of Energy Materials Sciences Division [W-31-109-ENG-38, DEFG02-91ER45439] FX The authors wish to thank K. O'Hara, C. Klug, S. DeSoto, J. Martindale and K. Sakaie for their help in experiments and fruitful conversations. They also thank D. Pines, A. Millis, H. Monien, J.P. Lu, D. Thelen, J.J. Yu, Y.Q. Song and W. Halperin for enlightening discussions. This work was supported by the U.S. National Science Foundation through the Science and Technotogy Center for Superconductivity Grant Number DMR-88-09854 (C.P.S., T.I., and B.V.), the U.S. department of Energy Materials Sciences Division under Contract Number W-31-109-ENG-38 (B.V. and A.P.P.) and under Grant Number DEFG02-91ER45439 to the University of Illinois at Urbana-Champaign, Materials Research Laboratory (C.P.S. and T.I.). NR 48 TC 6 Z9 6 U1 1 U2 3 PU SPRINGER WIEN PI WIEN PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 WIEN, AUSTRIA SN 0937-9347 J9 APPL MAGN RESON JI Appl. Magn. Reson. PD JUN PY 1992 VL 3 IS 3-4 BP 729 EP 744 PG 16 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA V20BI UT WOS:000208115100019 ER PT J AU SWARNALATHA, M STEWART, AF GUENTHER, AH CARNIGLIA, CK AF SWARNALATHA, M STEWART, AF GUENTHER, AH CARNIGLIA, CK TI OPTICAL AND STRUCTURAL-PROPERTIES OF THIN-FILMS DEPOSITED FROM LASER FUSED ZIRCONIA, HAFNIA, AND YTTRIA SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID DIOXIDE; OXIDE; INTERRELATIONSHIP AB The optical and structural properties of films deposited from laser sintered Zirconia (ZrO2), Hafnia (HfO2), and Yttria (Y2O3) and from the commercially available (unprocessed material) Zirconia. Hafnia and Yttria, were studied and compared. All the films had low absorption. Films deposited from the laser sintered material had very low optical inhomogeneity. ZrO2 films showed negative inhomogeneity for films deposited from the unprocessed material. The refractive index increased for ZrO2 films deposited from the laser sintered material. HfO2 and Y2O3 films showed positive inhomogeneity when deposited from the unprocessed material. The refractive index of the films of these materials decreased when deposited from the laser sintered material. The thin films of ZrO2 and Y2O3 prepared from laser sintered material had stable monoclinic and cubic structures respectively while HfO2 films were found to be amorphous. C1 LITTON GUIDANCE & MISSILE SYST,LOS ANGELES,CA 91367. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. S SYST CORP,ALBUQUERQUE,NM 87119. RP SWARNALATHA, M (reprint author), INDIAN INST SCI,INSTRUMENTAT & SERV UNIT,BANGALORE 560012,KARNATAKA,INDIA. NR 23 TC 14 Z9 15 U1 1 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD JUN PY 1992 VL 54 IS 6 BP 533 EP 537 DI 10.1007/BF00324335 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JA801 UT WOS:A1992JA80100013 ER PT J AU GOURLEY, PL WARREN, ME VAWTER, GA BRENNAN, TM HAMMONS, BE AF GOURLEY, PL WARREN, ME VAWTER, GA BRENNAN, TM HAMMONS, BE TI OPTICAL BLOCH WAVES IN A SEMICONDUCTOR PHOTONIC LATTICE SO APPLIED PHYSICS LETTERS LA English DT Article AB We have observed multiple optical Bloch waves in a semiconductor photonic lattice. This photonic lattice comprises epitaxial quarter-wave periodic layers surrounding a periodic quantum-well region. After growth, the layers are structured laterally into periodic square unit cells by reactive-ion-beam etching. When photoexcited, the lattice emits a complex angular distribution of photons that reflects its periodic structure. Scattered light is distributed according to the Laue conditions in analogy with x-ray diffraction from a bulk crystal. Optical Bloch waves photostimulated in the lattice are analogous to electron Bloch waves in an atomic lattice. These optical Bloch waves exhibit long-range translational symmetry and local symmetry due to the shape of the unit cell. Interestingly, the far-field pattern of stimulated emission gives a direct mapping of the allowed Bloch wave vectors in the Brillouin zone. The mapping exhibits a wave-vector gap at the Bragg condition and may be associated with a photonic energy gap. In addition to measuring the intensity distribution of these Bloch waves, we directly measure the phase of the wave by polarization shearing interferometry. RP GOURLEY, PL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 14 Z9 14 U1 1 U2 6 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 JUN 1 PY 1992 VL 60 IS 22 BP 2714 EP 2716 DI 10.1063/1.106853 PG 3 WC Physics, Applied SC Physics GA HW729 UT WOS:A1992HW72900002 ER PT J AU GEOHEGAN, DB AF GEOHEGAN, DB TI FAST INTENSIFIED-CCD PHOTOGRAPHY OF YBA2CU3O7-X LASER ABLATION IN VACUUM AND AMBIENT OXYGEN SO APPLIED PHYSICS LETTERS LA English DT Article ID DEPOSITION; FILMS; ENVIRONMENT; GROWTH AB The propagation of laser ablation plumes from 248 nm laser-irradiated YBCO into vacuum and 100 mTorr ambient oxygen has been photographed with a gated, intensified CCD array camera system. The thermalization of the laser plasma and onset of shock structures due to collisions with the background gas are investigated from two-dimensional digitized images of the visible plume emission. RP GEOHEGAN, DB (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Geohegan, David/D-3599-2013 OI Geohegan, David/0000-0003-0273-3139 NR 17 TC 304 Z9 307 U1 0 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 1 PY 1992 VL 60 IS 22 BP 2732 EP 2734 DI 10.1063/1.106859 PG 3 WC Physics, Applied SC Physics GA HW729 UT WOS:A1992HW72900008 ER PT J AU ERES, D SHARP, JW AF ERES, D SHARP, JW TI REAL-TIME MONITORING OF A SURFACE-REACTION IN GERMANIUM FILM GROWTH SO APPLIED PHYSICS LETTERS LA English DT Article AB Epitaxial germanium film growth by a surface reaction was investigated using a pulsed molecular jet. Time-resolved reflectometry was utilized for in situ monitoring of both the formation and the evolution of a chemisorbed layer of digermane. The rate of chemisorption was independent of temperature. Evolution of the adsorption layers occurred by a temperature dependent first-order process, believed to be molecular hydrogen desorption. Digital growth of germanium films was demonstrated by periodically refilling the active surface sites liberated by molecular hydrogen desorption between two successive gas pulses. Epitaxial germanium films over 150 nm thick were grown on Si (100) substrates. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. RP ERES, D (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Eres, Gyula/C-4656-2017 OI Eres, Gyula/0000-0003-2690-5214 NR 12 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 1 PY 1992 VL 60 IS 22 BP 2764 EP 2766 DI 10.1063/1.106870 PG 3 WC Physics, Applied SC Physics GA HW729 UT WOS:A1992HW72900019 ER PT J AU KLAUSMEIERBROWN, ME VIRSHUP, GF BOZOVIC, I ECKSTEIN, JN RALLS, KS AF KLAUSMEIERBROWN, ME VIRSHUP, GF BOZOVIC, I ECKSTEIN, JN RALLS, KS TI ENGINEERING OF ULTRATHIN BARRIERS IN HIGH-TC, TRILAYER JOSEPHSON-JUNCTIONS SO APPLIED PHYSICS LETTERS LA English DT Article ID EDGE JUNCTIONS; THIN-FILMS; GROWTH; BI2SR2CA2CU3OX; FABRICATION; SQUIDS AB Josephson junctions with ultrathin (25-40 angstrom) barriers were fabricated using high T(C), trilayer films grown by atomic layer-by-layer molecular beam epitaxy (ALL-MBE). The films consisted of top and bottom electrodes of Bi2Sr2CaCu2O8, Separated by a single molecular layer of a metastable compound, Bi2Sr2(Ca, Sr, Bi, Dy)n-1CunO2n + 4, with n = 5 to 11. Systematic variation of Bi or Dy doping on Ca sites in the barrier layer provided four orders of magnitude of tuning of both the junction critical current and the normal state resistance, while keeping their product approximately constant, near 0.5 mV. Barrier and junction engineering, on an atomic length scale, has been demonstrated for the first time. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KLAUSMEIERBROWN, ME (reprint author), VARIAN ASSOCIATES INC,EDWARD L GINZTON RES CTR,PALO ALTO,CA 94304, USA. NR 29 TC 48 Z9 48 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 1 PY 1992 VL 60 IS 22 BP 2806 EP 2808 DI 10.1063/1.106834 PG 3 WC Physics, Applied SC Physics GA HW729 UT WOS:A1992HW72900033 ER PT J AU FIROUZBAKHT, ML SCHYLER, DJ WOLF, AP AF FIROUZBAKHT, ML SCHYLER, DJ WOLF, AP TI EFFECT OF FOIL MATERIAL ON THE APPARENT YIELD OF THE XE-124(P, X) I-123 REACTION SO APPLIED RADIATION AND ISOTOPES LA English DT Article ID HIGH-PURITY I-123; EXCITATION-FUNCTIONS; ENRICHED XENON-124; PROTON AB The effect of the foil material on the recovery of Xe- 123 from the irradiation cell used for the measurement of the production of I-123 from the proton reaction on xenon-124 has been studied. The metal used for the foil can have a significant effect on the amount of Xe-123 which can be cryogenically pumped out of the irradiation cell at 30 min after the end of irradiation. Foils made from several metals and alloys were tested. Of these, the effect is most pronounced with "Havar" alloy foil where only 58% of the theoretically available activity was recovered. This effect should be considered and tested in the measurement of reaction cross-sections in irradiation cells and targets which have metal foils. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 21 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD JUN PY 1992 VL 43 IS 6 BP 741 EP 745 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HZ541 UT WOS:A1992HZ54100008 ER PT J AU CALLAHAN, AP RICE, DE MCPHERSON, DW MIRZADEH, S KNAPP, FF AF CALLAHAN, AP RICE, DE MCPHERSON, DW MIRZADEH, S KNAPP, FF TI THE USE OF ALUMINA SEPPAKS AS A SIMPLE METHOD FOR THE REMOVAL AND DETERMINATION OF TUNGSTEN-188 BREAKTHROUGH FROM TUNGSTEN-188 RE-188 GENERATORS SO APPLIED RADIATION AND ISOTOPES LA English DT Note ID RADIONUCLIDE GENERATOR; SYSTEM; IRIDIUM-191M; CARBON AB A simple method using an alumina SepPak(R) has been developed to determine the breakthrough levels of W-188 from W-188/Re-188 generator systems. Detection of low levels of W-188 in the presence of high levels of Re-188 (155 keV, 15%) by traditional counting techniques is not possible because the W-188 parent emits gamma photons of only very low intensity at 227 keV (0.22%) and 290 keV (0.40%). In order to remove and quantitate levels of W-188 in "real time" without having to wait several days for decay of the Re-188 daughter, the use of an alumina SepPak(R) in tandem with the alumina generator is an effective technique to trap the W-188 breakthrough. The efficiency of this technique was demonstrated by doping 2 mCi of Re-188 with 2-mu-Ci of W-188. This doped sample provided a control which would correspond to a very high breakthrough value (0.1%), which is 10(3) times greater than the usual breakthrough of the alumina system (< 10(-4)%). Even these very high levels of W-188 could not be detected by gamma-ray spectroscopy in the presence of the Re-188. When the eluant was subsequently passed through an acid-washed alumina SepPak(R) followed by thorough washing (20 mL) with 0.9% NaCl, however, the 227 and 290 keV gamma lines were clearly detected, which facilitated quantification of the W-188 breakthrough levels. Breakthrough levels 1000 times lower could still be detected by this method, making it a useful quality control tool in assessing W-188/Re-188 generator performance. C1 OAK RIDGE NATL LAB,NUCL MED GRP,POB 2008,OAK RIDGE,TN 37831. NR 19 TC 16 Z9 16 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD JUN PY 1992 VL 43 IS 6 BP 801 EP 804 PG 4 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HZ541 UT WOS:A1992HZ54100017 ER PT J AU WARD, KJ HAALAND, DM ROBINSON, MR EATON, RP AF WARD, KJ HAALAND, DM ROBINSON, MR EATON, RP TI POSTPRANDIAL BLOOD-GLUCOSE DETERMINATION BY QUANTITATIVE MIDINFRARED SPECTROSCOPY SO APPLIED SPECTROSCOPY LA English DT Article DE NONINVASIVE GLUCOSE DETERMINATION; IR SPECTROSCOPY; MULTIVARIATE CALIBRATION; PARTIAL LEAST-SQUARES ID FT-IR-SPECTROSCOPY; WHOLE-BLOOD; PROTEIN ADSORPTION; CALIBRATION AB The multivariate calibration method of partial least-squares (PLS) was applied to the mid-infrared spectra of whole blood for quantitatively determining blood glucose concentrations. Separate calibration models were developed on the basis of spectra of whole blood obtained from six diabetic subjects from either in vitro glucose-supplemented blood or blood obtained from the same subjects in the post-prandial state during meal tolerance tests. The cross-validated PLS calibrations yielded average errors in glucose concentration of 11 and 13 mg/dL, respectively. It is desirable to use the calibration models based on the in vitro glucose-supplemented blood for determining glucose concentrations in unknown blood samples. However, when these multivariate calibration models based upon in vitro blood spectra were applied to the spectra of the post-prandial blood samples, a subject-dependent concentration bias was observed. The source of this bias was not identified, but when the glucose determinations were corrected for the bias, average concentration errors were found to be 14 mg/dL. Changes in spectrometer design or calibrations based on large numbers of subjects are expected to eliminate the presence of this bias. If these measures do not succeed in eliminating the bias, then methods are demonstrated that significantly reduce the bias while retaining the sensitive outlier detection capabilities of the PLS methods. These latter methods require that the infrared spectrum and reference glucose levels be obtained from a single blood sample from each subject. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,SCH MED,ALBUQUERQUE,NM 87131. NR 11 TC 63 Z9 64 U1 2 U2 4 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUN PY 1992 VL 46 IS 6 BP 959 EP 965 DI 10.1366/0003702924124493 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA HZ915 UT WOS:A1992HZ91500012 ER PT J AU CHAN, WT MAO, XL RUSSO, RE AF CHAN, WT MAO, XL RUSSO, RE TI DIFFERENTIAL VAPORIZATION DURING LASER ABLATION DEPOSITION OF BI-SR-CA-CU-O SUPERCONDUCTING MATERIALS SO APPLIED SPECTROSCOPY LA English DT Article DE LASER ABLATION; THERMAL VAPORIZATION; ICP-AES; HIGH-TEMPERATURE SUPERCONDUCTORS ID THIN-FILMS; HIGH-TC; EVAPORATION AB Nanosecond and picosecond pulsed laser ablated materials from Bi-Sr-Ca-Cu-O superconducting targets are monitored by inductively coupled plasma-atomic emission spectrometry with a photodiode array detector. Differential vaporization was observed; elements of the lower-melting-point oxides (Bi2O3 and CuO) are enriched in the vapor phase, indicating a thermal vaporization mechanism. Melted droplets observed with SEM and enriched Ca and Sr content in the ablation crater measured with EDX support the hypothesis. A steady-state mass ablation composition after prolonged laser sampling is also observed; the ratios of intensity for Bi, Ca, and Sr to Cu are constant for power density 0.1 to 3.0 GW/cm2. C1 LAWRENCE BERKELEY LAB,M-S 90-2024,BERKELEY,CA 94720. NR 25 TC 37 Z9 38 U1 0 U2 7 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUN PY 1992 VL 46 IS 6 BP 1025 EP 1031 DI 10.1366/0003702924124510 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA HZ915 UT WOS:A1992HZ91500023 ER PT J AU COAN, C JI, JY HIDEG, K MEHLHORN, RJ AF COAN, C JI, JY HIDEG, K MEHLHORN, RJ TI PROTEIN SULFHYDRYLS ARE PROTECTED FROM IRREVERSIBLE OXIDATION BY CONVERSION TO MIXED DISULFIDES SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID SARCOPLASMIC-RETICULUM MEMBRANES; RADICAL FORMATION; TRANSPORT CYCLE; SPIN-LABEL; ATPASE; CA-2+-ATPASE; ORIENTATION; REACTIVITY; STRESS C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,MAILSTOP 70-193A,BERKELEY,CA 94720. UNIV PACIFIC,SAN FRANCISCO,CA 94115. UNIV PECS,CENT LAB CHEM,H-7643 PECS,HUNGARY. FU NIGMS NIH HHS [GM 38073] NR 35 TC 57 Z9 57 U1 1 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD JUN PY 1992 VL 295 IS 2 BP 369 EP 378 DI 10.1016/0003-9861(92)90530-A PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HU937 UT WOS:A1992HU93700022 PM 1316737 ER PT J AU LEONARD, PJT LINNELL, AP AF LEONARD, PJT LINNELL, AP TI ON THE POSSIBILITY OF A COLLISIONAL ORIGIN FOR THE BLUE STRAGGLERS AND CONTACT BINARIES IN THE OLD OPEN CLUSTERS M67 AND NGC-188 SO ASTRONOMICAL JOURNAL LA English DT Review ID ANGULAR-MOMENTUM LOSS; STELLAR COLLISIONS; NGC 188; GRAVITATIONAL ENCOUNTERS; SPECTROSCOPIC BINARIES; GLOBULAR-CLUSTERS; CLOSE BINARIES; SINGLE STAR; EVOLUTION; SYSTEMS AB We examine the problem of the origin of the blue stragglers and contact binaries in the old open clusters M67 and NGC 188. The existing formation scenarios for these objects face many observational difficulties. As an alternative, we consider the hypothesis that the blue stragglers and contact binaries are formed via physical stellar collisions and tidal captures, respectively, during strong dynamical interactions involving binary stars. This mechanism can naturally account for many of the observed properties of these objects. We have attempted to test the collisional hypothesis by carrying out binary-binary and binary-single scattering experiments tailored to the old open clusters M67 and NGC 188. Our experiments indicate that isolated interactions involving binaries composed of main-sequence stars are unlikely to account for 100% of the blue stragglers and contact binaries in the two clusters. However, such interactions can easily produce congruent-to 10% of the observed objects. We describe ways in which the production rate of blue stragglers and contact binaries via collisions may be enhanced. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. RP LEONARD, PJT (reprint author), UNIV BRITISH COLUMBIA,DEPT GEOPHYS & ASTRON,VANCOUVER V6T 1Z4,BC,CANADA. NR 106 TC 59 Z9 61 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUN PY 1992 VL 103 IS 6 BP 1928 EP 1944 DI 10.1086/116202 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV913 UT WOS:A1992HV91300014 ER PT J AU HILLS, JG AF HILLS, JG TI EFFECT OF INTRUDER MASS ON COLLISIONS WITH HARD BINARIES .2. DEPENDENCE ON IMPACT PARAMETER AND COMPUTATIONS OF THE INTERACTION CROSS-SECTIONS SO ASTRONOMICAL JOURNAL LA English DT Article ID DYNAMICAL EVOLUTION; CLOSE ENCOUNTERS; SINGLE STARS; COMPUTER-SIMULATIONS; STELLAR COLLISIONS; GLOBULAR-CLUSTERS; VELOCITY; SYSTEM AB I simulated over 125 000 encounters between a hard binary (orbital velocity is 10(3) times the impact velocity) with equal mass M0, components and orbital eccentricity e(o) = 0 and intruders with masses ranging from M(i) = (0.01 to 10 000) M0. Each encounter was followed up to a maximum of 5 X 10(6) integration steps to allow long-term "resonances," temporary trinary systems, to break into a binary and a single star. These simulations were done over a range of impact parameters to find the cross sections for various processes occurring in these encounters. Many cross sections, particularly that for energy exchange, tend to approach simple analytic limits if M(i)/M0 much less than 1 and M(i)/M0 much greater than 1. The cross sections tend to have inflection points around M0/M0 = 1 that cannot be modeled except by detailed numerical simulations. A critical impact parameter found in these simulations is the one beyond which no exchange collisions can occur. The closest approach distance, R(min), corresponding to this impact parameter is R(c) congruent to 2.1 a(o)[(M(i) + 2M0)/2M0]1/3 where a(o) is the initial semimajor axis of the orbit. The energy exchange between the binary and a massive intruder decreases greatly in collisions with R(min) greater-than-or-equal-to R(c). The semimajor axes and orbital eccentricity of the surviving binary also drops rapidly at R(c) in encounters with massive intruders. The formation of temporary trinary systems is important for all intruder masses. There is a drastic increase ("rupture") in the median semimajor axis, [a(out)], of the outer member of the trinaries (resonances) formed in encounters where R(min) greater-than-or-equal-to R(c); i.e., [a(out)] typically increases by a factor of 10(4) in going from R(min) = R(c) to 1.5R(c). These trinaries have long lives, so they have a chance of being stabilized by the perturbations of other stars that can decrease the eccentricity of the outer member of the trinary sufficiently that it no longer passes near the inner binary. This can produce stable trinaries with very distant members such as Proxima Centauri orbiting the Alpha Centauri binary. RP HILLS, JG (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 28 TC 35 Z9 35 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUN PY 1992 VL 103 IS 6 BP 1955 EP 1969 DI 10.1086/116204 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV913 UT WOS:A1992HV91300016 ER PT J AU KOVACS, G BUCHLER, JR MAROM, A IGLESIAS, CA ROGERS, FJ AF KOVACS, G BUCHLER, JR MAROM, A IGLESIAS, CA ROGERS, FJ TI CHEMICAL-COMPOSITION EFFECTS AND DOUBLE-MODE RR-LYRAE MASSES SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE STARS, RR-LYR; STARS, OSCILLATIONS OF; STARS, ABUNDANCES OF ID GLOBULAR-CLUSTERS; METAL ABUNDANCES; STARS; OXYGEN; CARBON; RATIOS AB On the basis of accumulating observational evidence that Pop. II stars are overabundant in oxygen and other heavy elements, we compute RR Lyrae models with new mixtures of heavy elements. Comparing these results with the ones obtained with a solar (Anders-Grevesse) composition we conclude that: (i) with the same total metal abundance Z the models with Pop. II mixtures yield masses smaller than the ones with a solar mixture, (ii) with the same absolute Fe abundance the new masses are higher, (iii) these two effects increase with Z; (iv) the masses of the double-mode RR Lyrae (especially Oosterhoff I) stars obtained with the period ratio method therefore are left uncertain up to almost-equal-to 0.1 M. until accurate abundances for the dominant elements become available for individual stars. C1 UNIV FLORIDA, DEPT PHYS, GAINESVILLE, FL 32611 USA. KONKOLY OBSERV BUDAPEST, BUDAPEST, HUNGARY. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. HEBREW UNIV JERUSALEM, DEPT PHYS, JERUSALEM, ISRAEL. NR 18 TC 27 Z9 27 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JUN PY 1992 VL 259 IS 2 BP L46 EP L48 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JB318 UT WOS:A1992JB31800005 ER PT J AU BENNETT, CL SMOOT, GF JANSSEN, M GULKIS, S KOGUT, A HINSHAW, G BACKUS, C HAUSER, MG MATHER, JC ROKKE, L TENORIO, L WEISS, R WILKINSON, DT WRIGHT, EL DEAMICI, G BOGGESS, NW CHENG, ES JACKSON, PD KEEGSTRA, P KELSALL, T KUMMERER, R LINEWEAVER, C MOSELEY, SH MURDOCK, TL SANTANA, J SHAFER, RA SILVERBERG, RF AF BENNETT, CL SMOOT, GF JANSSEN, M GULKIS, S KOGUT, A HINSHAW, G BACKUS, C HAUSER, MG MATHER, JC ROKKE, L TENORIO, L WEISS, R WILKINSON, DT WRIGHT, EL DEAMICI, G BOGGESS, NW CHENG, ES JACKSON, PD KEEGSTRA, P KELSALL, T KUMMERER, R LINEWEAVER, C MOSELEY, SH MURDOCK, TL SANTANA, J SHAFER, RA SILVERBERG, RF TI COBE DIFFERENTIAL MICROWAVE RADIOMETERS - CALIBRATION TECHNIQUES SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; INSTRUMENTATION, DETECTORS ID COSMIC-BACKGROUND-EXPLORER AB The COBE spacecraft was launched 1989 November 18 UT carrying three scientific instruments into Earth orbit for studies of cosmology. One of these instruments, the Differential Microwave Radiometer (DMR), is designed to measure the large-angular-scale temperature anisotropy of the cosmic microwave background radiation at three frequencies (31.5, 53, and 90 GHz). In this paper we present three methods used to calibrate the DMR. First, the signal difference between beam-filling hot and cold targets observed on the ground provides a primary calibration that is transferred to space by noise sources internal to the instrument. Second, the Moon is used in flight as an external calibration source. Third, the signal arising from the Doppler effect due to the Earth's motion around the barycenter of the solar system is used as an external calibration source. Preliminary analysis of the external source calibration techniques confirms the accuracy of the currently more precise ground-based calibration. Assuming the noise source behavior did not change from the ground-based calibration to flight we derive a 0.1%-0.4% relative and 0.7%-2.5% absolute calibration uncertainty, depending on radiometer channel. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. HUGHES STX CORP,LANHAM,MD 20706. GEN RES CORP,DANVERS,MA 01923. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. JET PROP LAB,PASADENA,CA 91109. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. RP BENNETT, CL (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,CODE 685,GREENBELT,MD 20771, USA. RI Moseley, Harvey/D-5069-2012; Kogut, Alan/D-6293-2012; Rokke, Laurie/I-5642-2015 OI Rokke, Laurie/0000-0002-5696-7240 NR 14 TC 41 Z9 41 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 JUN 1 PY 1992 VL 391 IS 2 BP 466 EP 482 DI 10.1086/171363 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV512 UT WOS:A1992HV51200007 ER PT J AU MATHEWS, GJ BAZAN, G COWAN, JJ AF MATHEWS, GJ BAZAN, G COWAN, JJ TI EVOLUTION OF HEAVY-ELEMENT ABUNDANCES AS A CONSTRAINT ON SITES FOR NEUTRON-CAPTURE NUCLEOSYNTHESIS SO ASTROPHYSICAL JOURNAL LA English DT Review DE NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, ABUNDANCES; SUPERNOVAE, GENERAL ID METAL-POOR STARS; R-PROCESS NUCLEOSYNTHESIS; INTERMEDIATE-MASS STARS; GIANT BRANCH EVOLUTION; S-PROCESS ABUNDANCES; EXTREME HALO STARS; SOLAR NEIGHBORHOOD; CHEMICAL EVOLUTION; OXYGEN ABUNDANCES; GALACTIC DISK AB Observed heavy-element abundance ratios in the halo and the disk are compared with one-zone models of galactic chemical evolution. These comparisons provide useful insight into the kinds of stellar environments responsible for r- and s-process nucleosynthesis. The growth of r-process material appears to be associated with the ejection rate of material from massive stars. Low-mass Type II supernovae are slightly favored if the r-process is primary. The growth of s-process material is consistent with production in intermediate-mass stars. The yields for both the s- and the r-process, however, appear to require a neutron source which does not depend upon initial metallicity. C1 UNIV ILLINOIS, DEPT ASTRON, URBANA, IL 61801 USA. UNIV OKLAHOMA, DEPT PHYS & ASTRON, NORMAN, OK 73019 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 140 TC 152 Z9 155 U1 1 U2 2 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 JUN 1 PY 1992 VL 391 IS 2 BP 719 EP 735 DI 10.1086/171383 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV512 UT WOS:A1992HV51200027 ER PT J AU STARRFIELD, S SHORE, SN SPARKS, WM SONNEBORN, G TRURAN, JW POLITANO, M AF STARRFIELD, S SHORE, SN SPARKS, WM SONNEBORN, G TRURAN, JW POLITANO, M TI A PREDICTION OF THE GAMMA-RAY FLUX FROM NOVA HERCULIS 1991 SO ASTROPHYSICAL JOURNAL LA English DT Article DE NOVAE, CATACLYSMIC VARIABLES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID OUTBURST AB Hydrodynamic simulations of thermonuclear runaways in the accreted hydrogen-rich envelopes on 1.0 M., 1.25 M., and 1.35 M. white dwarfs predict Na-22 and Al-26 gamma-ray emission from ONeMg novae in outburst. We present and discuss the ultraviolet observations made with the International Ultraviolet Explorer satellite of Nova Her 1991, the most recent bright ONeMg nova. A distance of 3.4 kpc and reddening of E(B-V) = 0.6 to Nova Her 1991 are determined by comparing its UV and optical outburst behavior with those of the extragalactic ONeMg nova LMC 1990 No. 1. Her 1991 was also detected by ROSAT five days into its outburst and we argue that a small fraction of the X-rays may be the product of Comptonized 1.2 and 0.5 MeV emission from the decay of Na-22. If the mass of the ejected shell is indeed as high as has been estimated by Woodward et al., approximately 10(-4) M., then our results predict that Na-22 gamma-ray emission from the ejecta of Nova Her 1991 should still be detectable by GRO in the spring of 1992. The detection level is expected to be approximately 5-sigma in a 2 week observation. Such a detection would strongly guide and constrain the hydrodynamic and nucleosynthesis simulations of nova outbursts on massive white dwarfs. C1 NASA,GODDARD SPACE FLIGHT CTR,COMP SCI CORP,GHRS SCI TEAM,GREENBELT,MD 20771. LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS GRP,GREENBELT,MD 20771. UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. RP STARRFIELD, S (reprint author), ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287, USA. NR 23 TC 48 Z9 48 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 JUN 1 PY 1992 VL 391 IS 2 BP L71 EP L74 DI 10.1086/186401 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV513 UT WOS:A1992HV51300006 ER PT J AU HILST, GR AF HILST, GR TI PROPORTIONALITY BETWEEN SO2 EMISSIONS AND WET SO42-CONCENTRATIONS - THE EFFECT OF AREA OF AVERAGING SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE ACID RAIN; SULFATE; POLLUTANT EMISSIONS; SOURCE RECEPTOR RELATIONSHIPS; CENTRAL NORTH AMERICA ID ACID DEPOSITION; UNITED-STATES AB An earlier analysis of empirical associations between SO2 emissions and wet SO42- concentrations in central North America (Hilst and Chapman, 1990, Atmospheric Environment 24A, 1889-1901) showed that local wet SO42- concentrations were not proportional to SO2 emissions averaged over areas up to approximately 10(6)km2. Because it is axiomatic that at a global level of averaging a proportionality between total S emissions and S deposition should exist, we have extended these analyses in an attempt to determine whether there is proportionality between S emissions and wet SO42- deposition. We have found that for the eastern half of central North America (an area of about 4.3 x 10(6) km2), the annual average wet SO42- concentration exhibits a linear-proportional dependence on anthropogenic SO2 emissions. However, the internal structure of this association for subareas of the eastern half of central North America suggests the "global" proportionality is achieved by a combination of imported SO2 from major source areas and an oxidant-limited conversion of SO2 to SO42- within the major source areas. If this inference is even approximately correct, a rollback SO2 control strategy for the eastern United States and southeast Canada should result in an immediate proportional decrease in wet SO42- concentrations in minor SO2 source areas, but no appreciable reduction of wet SO42- concentrations in major SO2 source areas until the oxidant limitation has been overcome. RP HILST, GR (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 11 TC 7 Z9 8 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1992 VL 26 IS 8 BP 1413 EP 1420 DI 10.1016/0960-1686(92)90126-6 PG 8 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HR206 UT WOS:A1992HR20600005 ER PT J AU LOVETT, GM LINDBERG, SE AF LOVETT, GM LINDBERG, SE TI CONCENTRATION AND DEPOSITION OF PARTICLES AND VAPORS IN A VERTICAL PROFILE THROUGH A FOREST CANOPY SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE DRY DEPOSITION; SULFATE; NITRATE; AMMONIUM; POTASSIUM; CALCIUM; ACIDITY ID DECIDUOUS FOREST; DRY DEPOSITION; NITRATE; ATMOSPHERE; MODEL AB Vertical profiles of deposition and concentration of several particulate and gaseous species were measured in a mixed oak forest in eastern Tennessee. Deposition was measured to plastic petri plates and to paper filters, and atmospheric concentrations were measured by low-volume filtration. The results show that concentration of HNO3 vapor and coarse particle-associated elements like Ca2+ decrease markedly with depth in the canopy, but this is not true for substances associated with fine aerosols like SO42-, NH4+ and H+. Potassium showed a trend of increasing deposition to the petri plates with depth in the canopy, indicating a significant in-canopy source of particulate K+. The paper filters showed a strong decrease in deposition of SO42-, NO3- and NH4+ in the canopy, indicating that surfaces in the interiors of the canopy are subject to substantially less S and N deposition than those at the top. The deposition velocity of HNO3 vapor to the paper filters was at a minimum in mid-canopy. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP LOVETT, GM (reprint author), NEW YORK BOT GARDEN,MARY FLAGLER CARY ARBORETUM,INST ECOSYST STUDIES,BOX AB,MILLBROOK,NY 12545, USA. RI Lovett, Gary/H-3800-2013; OI Lovett, Gary/0000-0002-8411-8027 NR 22 TC 21 Z9 28 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1992 VL 26 IS 8 BP 1469 EP 1476 DI 10.1016/0960-1686(92)90132-5 PG 8 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HR206 UT WOS:A1992HR20600011 ER PT J AU LINDBERG, SE LOVETT, GM AF LINDBERG, SE LOVETT, GM TI DEPOSITION AND FOREST CANOPY INTERACTIONS OF AIRBORNE SULFUR - RESULTS FROM THE INTEGRATED FOREST STUDY SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE DEPOSITION; NUTRIENT CYCLE; FOREST; CANOPY; SULFUR; RECEPTOR ID PARTICLE DRY DEPOSITION; ATMOSPHERIC DEPOSITION; DECIDUOUS FOREST; INERT SURFACES; MAJOR IONS; THROUGHFALL; VELOCITIES; SULFATE; RATES; WET AB The Integrated Forest Study (IFS) was a long-term research project designed to determine the effects of atmospheric deposition on forest nutrient cycles. Concentrations and fluxes of airborne sulfur compounds were determined for several years at the 13 IFS research forests in North America and Europe using a standard set of protocols. Annual mean air concentrations of sulfur ranged from approximately 1.5 to 8-mu-gSm-3, and were generally dominated by SO2 (approximately 60% of total sulfur on the average). Atmospheric deposition of sulfate at these forests was highest at the high elevation (approximately 1000-2000 eq ha-1yr-1) and at the southeastern U.S. sites(approximately 800-1000 eq ha-1yr-1), and lowest in the Pacific northwest (approximately 300 eq ha-1yr-1). Cloud water contributed significantly to the sulfur flux at the mountain sites (45-50%), and dry deposition was comparable to wet at the drier southeastern sites (> 40% of total). Deposited sulfur appeared to behave more or less conservatively in these canopies, showing little net uptake (of SO2) and minor foliar leaching (of soil-derived, internal SO42-) relative to the total atmospheric flux. The estimated fluxes in total deposition were generally within 15% of the measured fluxes in throughfall plus stemflow, indicating that useful estimates of total atmospheric deposition of sulfur can be derived from measurements of throughfall. C1 NEW YORK BOT GARDEN,INST ECOSYST STUDIES,MILLBROOK,NY 12545. RP LINDBERG, SE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Lovett, Gary/H-3800-2013 NR 91 TC 100 Z9 106 U1 2 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1992 VL 26 IS 8 BP 1477 EP 1492 DI 10.1016/0960-1686(92)90133-6 PG 16 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HR206 UT WOS:A1992HR20600012 ER PT J AU HORWEDEL, JE RARIDON, RJ WRIGHT, RQ AF HORWEDEL, JE RARIDON, RJ WRIGHT, RQ TI AUTOMATED SENSITIVITY ANALYSIS OF AN ATMOSPHERIC DISPERSION MODEL SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE ADJOINT SENSITIVITY ANALYSIS; ATMOSPHERIC MODELING; AUTOMATED SENSITIVITY ANALYSIS; COMPUTER CALCULUS; COMPUTER MODELING; FORTRAN; RADIONUCLIDE DISPERSION; SENSITIVITY ANALYSIS AB Sensitivity analysis is a necessary component in the evaluation of computer models utilized in support of performance assessment activities. Understanding the behavior of predictive models with respect to input data is important for (1) verifying the validity of a model, (2) determining parameters for which it is important to have accurate values, and (3) understanding the behavior of the system being modeled. This paper describes an automated procedure for performing a comprehensive sensitivity analysis using computer calculus. The procedure employs an automated system called GRESS that utilizes a precompiler to enhance a FORTRAN computer code by adding derivative-taking capabilities. From a single run of an enhanced model, GRESS calculates and reports normalized sensitivities of selected results with respect to all input data. GRESS computes a normalized sensitivity by multiplying a derivative by its associated input parameter value and dividing by the associated output value. The automated GRESS procedure is applied to the code AIRDOS-EPA, which estimates radiation doses caused by atmospheric dispersion of radionuclides around nuclear facilities. The sensitivity calculations for a sample problem show good agreement with those obtained by perturbation analysis. Results demonstrate that an automated procedure can be used cheaply and efficiently to perform a comprehensive sensitivity analysis of existing computer models. A methodology for developing enhanced versions of assessment models that include the capability to report routinely sensitivities for important parameters is discussed. Both GRESS and AIRDOS-EPA are available from the Radiation Shielding Information Center at Oak Ridge National Laboratory, P.O. Box 2008. RP HORWEDEL, JE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 12 TC 5 Z9 7 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1992 VL 26 IS 9 BP 1643 EP 1649 DI 10.1016/0960-1686(92)90063-Q PG 7 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HW525 UT WOS:A1992HW52500009 ER PT J AU BENNER, WH OGOREVC, B NOVAKOV, T AF BENNER, WH OGOREVC, B NOVAKOV, T TI OXIDATION OF SO-2 IN THIN WATER FILMS CONTAINING NH3 SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE SO-2 OXIDATION; SULFATE; NH3; THIN WATER FILM ID SULFUR-DIOXIDE; DROPLETS; SO2(G) AB The reaction between NH3 and SO2 in thin water films was studied with a focus on the formation of sulfate. The reactions were conducted at 5 and 60% relative humidities or partial pressure of water vapor and at 0.04, 0.16 or 0.20 atm O2 for temperatures between 20 and 50-degrees-C using a flow reactor and static flask reactors. In the presence of water vapor, the oxidation of SO2 to sulfate was observed only when NH3 was present. The product was primarily (NH4)2SO4. Conversion of as much as 81 % of the SO2 to sulfate was observed after 10 min of reaction when the initial concentrations of SO2 and NH3 were 1 ppm and the relative humidity was 60%. Conversion was only 1-3% when NH3 and/or water vapor were absent from the system. The surface of the reactor was found to influence the reaction by providing a place for a film of liquid water to form, and for the first several hours of reaction in the film, the rate of sulfate formation was observed to be faster than oxidation in liquid water. In general, these results suggest that thin water films on environmental surfaces play a greater role in the deposition of atmospheric gases and the accumulation of their reaction products on surfaces than previously considered. RP BENNER, WH (reprint author), LAWRENCE BERKELEY LAB,DIV APPL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 22 TC 22 Z9 22 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1992 VL 26 IS 9 BP 1713 EP 1723 DI 10.1016/0960-1686(92)90069-W PG 11 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA HW525 UT WOS:A1992HW52500015 ER PT J AU BAEDECKER, PA REDDY, MM REIMANN, KJ SCIAMMARELLA, CA AF BAEDECKER, PA REDDY, MM REIMANN, KJ SCIAMMARELLA, CA TI EFFECTS OF ACIDIC DEPOSITION ON THE EROSION OF CARBONATE STONE - EXPERIMENTAL RESULTS FROM THE UNITED-STATES NATIONAL ACID PRECIPITATION ASSESSMENT PROGRAM (NAPAP) SO ATMOSPHERIC ENVIRONMENT PART B-URBAN ATMOSPHERE LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON ACIDIC DEPOSITION : ITS NATURE AND IMPACTS CY SEP 16-21, 1990 CL GLASGOW, SCOTLAND DE CARBONATE STONE DECAY; ACID RAIN; MATERIALS DAMAGE; AIR POLLUTION AB One of the goals of NAPAP-sponsored research on the effects of acidic deposition on carbonate stone has been to quantify the incremental effects of wet and dry deposition of hydrogen ion, sulfur dioxide and nitrogen oxides on stone erosion. Test briquettes and slabs of freshly quarried Indiana limestone and Vermont marble have been exposed to ambient environmental conditions in a long-term exposure program. Physical measurements of the recession of test stones exposed to ambient conditions at an angle of 30-degrees to horizontal at the five NAPAP materials exposure sites range from approximately 15 to approximately 30-mu-m yr-1 for marble, and from approximately 25 to approximately 45-mu-m yr-1 for limestone, and are approximately double the recession estimates based on the observed calcium content of run-off solutions from test slabs. The difference between the physical and chemical recession measurements is attributed to the loss of mineral grains from the stone surfaces that are not measured in the run-off experiments. The erosion due to grain loss does not appear to be influenced by rainfall acidity, however, preliminary evidence suggests that grain loss may be influenced by dry deposition of sulfur dioxide between rainfall events. Chemical analyses of the run-off solutions and associated rainfall blanks suggest that approximately 30% of erosion by dissolution can be attributed to the wet deposition of hydrogen ion and the dry deposition of sulfur dioxide and nitric acid between rain events. The remaining approximately 70% of erosion by dissolution is accounted for by the solubility of carbonate stone in rain that is in equilibrium with atmospheric carbon dioxide ("clean rain"). These results are for marble and limestone slabs exposed at an angle of 30-degrees from horizontal. The relative contribution of sulfur dioxide to chemical erosion is significantly enhanced for stone slabs having an inclination of 60-degrees or 85-degrees. The dry deposition of alkaline particulate material has a mitigating effect at the two urban field exposure sites at Washington, DC, and Steubenville, OH. C1 IIT,CHICAGO,IL 60616. US GEOL SURVEY,LAKEWOOD,CO 80225. ARGONNE NATL LAB,ARGONNE,IL 60439. RP BAEDECKER, PA (reprint author), US GEOL SURVEY,RESTON,VA 22092, USA. NR 17 TC 37 Z9 37 U1 6 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0957-1272 J9 ATMOS ENVIRON B-URB PD JUN PY 1992 VL 26 IS 2 BP 147 EP 158 DI 10.1016/0957-1272(92)90018-N PG 12 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JD996 UT WOS:A1992JD99600001 ER PT J AU LIPFERT, FW DAUM, ML AF LIPFERT, FW DAUM, ML TI THE DISTRIBUTION OF COMMON CONSTRUCTION MATERIALS AT RISK TO ACID DEPOSITION IN THE UNITED-STATES SO ATMOSPHERIC ENVIRONMENT PART B-URBAN ATMOSPHERE LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON ACIDIC DEPOSITION : ITS NATURE AND IMPACTS CY SEP 16-21, 1990 CL GLASGOW, SCOTLAND DE MATERIALS DAMAGE; STOCK AT RISK; ACID DEPOSITION; COST BENEFIT ANALYSIS; SURVEY METHODS; ECONOMIC ASSESSMENT; SOCIOECONOMIC IMPACTS AB Information on the geographic distribution of various types of exposed materials is required to estimate the economic costs of damage to construction materials from acid deposition. This paper focuses on the identification, evaluation and interpretation of data describing the distributions of exterior construction materials, primarily in the United States. This information could provide guidance on how data needed for future economic assessments might be acquired in the most cost-effective ways. Materials distribution surveys from 16 cities in the U.S. and Canada and five related databases from government agencies and trade organizations were examined. Data on residential buildings are more commonly available than on nonresidential buildings; little geographically resolved information on distributions of materials in infrastructure was found. Survey results generally agree with the appropriate ancillary databases, but the usefulness of the databases is often limited by their coarse spatial resolution. Information on those materials which are most sensitive to acid deposition is especially scarce. Since a comprehensive error analysis has never been performed on the data required for an economic assessment, it is not possible to specify the corresponding detailed requirements for data on the distributions of materials. RP LIPFERT, FW (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 33 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0957-1272 J9 ATMOS ENVIRON B-URB PD JUN PY 1992 VL 26 IS 2 BP 217 EP 226 DI 10.1016/0957-1272(92)90025-N PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JD996 UT WOS:A1992JD99600008 ER PT J AU ROSKIES, AL WOOD, CC AF ROSKIES, AL WOOD, CC TI CINEMA 1-2-MANY OF THE MIND SO BEHAVIORAL AND BRAIN SCIENCES LA English DT Article ID MOTION C1 LOS ALAMOS NATL LAB,BIOPHYS GRP P6,LOS ALAMOS,NM 87545. RP ROSKIES, AL (reprint author), UNIV CALIF SAN DIEGO,DEPT PHILOSOPHY,LA JOLLA,CA 92037, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0140-525X J9 BEHAV BRAIN SCI JI Behav. Brain Sci. PD JUN PY 1992 VL 15 IS 2 BP 221 EP 223 PG 3 WC Psychology, Biological; Behavioral Sciences; Neurosciences SC Psychology; Behavioral Sciences; Neurosciences & Neurology GA HZ688 UT WOS:A1992HZ68800021 ER PT J AU KONG, S YONGE, DR JOHNSTONE, DL PETERSEN, JN BROUNS, TM AF KONG, S YONGE, DR JOHNSTONE, DL PETERSEN, JN BROUNS, TM TI CHROMIUM DISTRIBUTION IN SUBCELLULAR COMPONENTS BETWEEN FRESH AND STARVED SUBSURFACE BACTERIAL CONSORTIUM SO BIOTECHNOLOGY LETTERS LA English DT Article ID ENTEROBACTER-CLOACAE STRAIN; ANAEROBIC CONDITIONS; MICROORGANISMS; RESISTANCE; SEDIMENTS; CHROMATE; METALS; GROWTH AB The distribution of chromium in subcellular components was examined with a fresh and starved denitrifying consortium by performing Cr+6 equilibration and cell fractionation tests. The cell wall fraction of 50 day starved cells adsorbed approximately 100% more chromium than did the cell wall fraction in fresh cells. The soluble fraction of 50 day old cells showed less affinity for chromium than fresh cells. C1 WASHINGTON STATE UNIV, DEPT CIVIL & ENVIRONM ENGN, PULLMAN, WA 99164 USA. BATTELLE PACIFIC NORTHWEST LABS, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, DEPT CHEM ENGN, PULLMAN, WA 99164 USA. RI Petersen, James/B-8924-2008 NR 16 TC 7 Z9 7 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0141-5492 EI 1573-6776 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD JUN PY 1992 VL 14 IS 6 BP 521 EP 524 DI 10.1007/BF01023179 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA JB715 UT WOS:A1992JB71500017 ER PT J AU FINGER, PT AF FINGER, PT TI MICROWAVE PLAQUE THERMORADIOTHERAPY FOR CHOROIDAL MELANOMA SO BRITISH JOURNAL OF OPHTHALMOLOGY LA English DT Article ID HELIUM ION IRRADIATION; HYPERTHERMIC TREATMENT; UVEAL MELANOMAS; CLINICAL-EXPERIENCE; MALIGNANT-MELANOMA; INTRAOCULAR TUMORS; RADIATION; I125; THERAPY; RADIOTHERAPY AB Microwave thermoradiotherapy was used as a primary treatment for 44 patients with choroidal melanoma. An episcleral dish-shaped microwave antenna was placed beneath the tumour at the time of plaque brachy-therapy. While temperatures were measured at the sclera, the tumour's apex was targeted to receive a minimum of 42-degrees-C for 45 minutes. In addition, the patients received full or reduced doses of plaque radiotherapy. No patients have been lost to follow-up. Two eyes have been enucleated: one for rubeotic glaucoma, and one for uveitic glaucoma. Though six patients have died, only one death was due to metastatic choroidal melanoma (39 months after treatment). Clinical observations suggest that the addition of microwave heating to plaque radiation therapy of choroidal melanoma has been well tolerated. There has been a 97.7% local control rate (with a mean follow-up of 22.2 months). We have reduced the minimum tumour radiation dose (apex dose) to levels used for thermoradiotherapy of cutaneous melanomas (50 Gy/5000 rad). Within the range of this follow-up period no adverse effects which might preclude the use of this microwave heat delivery system for treatment of choroidal melanoma have been noted. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. NEW YORK EYE & EAR INFIRM,DEPT OPHTHALMOL,OCULAR TUMOR SERV,NEW YORK,NY 10003. RP FINGER, PT (reprint author), CORNELL UNIV,N SHORE UNIV HOSP,COLL MED,DEPT OPHTHALMOL,DIV OCULAR TUMOR & ORBITAL DIS,MANHASSET,NY 11030, USA. OI Finger, Paul T/0000-0002-8111-3896 NR 64 TC 37 Z9 37 U1 0 U2 1 PU BRITISH MED JOURNAL PUBL GROUP PI LONDON PA BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON, ENGLAND WC1H 9JR SN 0007-1161 J9 BRIT J OPHTHALMOL JI Br. J. Ophthalmol. PD JUN PY 1992 VL 76 IS 6 BP 358 EP 364 DI 10.1136/bjo.76.6.358 PG 7 WC Ophthalmology SC Ophthalmology GA HX131 UT WOS:A1992HX13100013 PM 1622949 ER PT J AU KARAGEORGI, E CLYMER, R MCEVILLY, TV AF KARAGEORGI, E CLYMER, R MCEVILLY, TV TI SEISMOLOGICAL STUDIES AT PARKFIELD .2. SEARCH FOR TEMPORAL VARIATIONS IN WAVE-PROPAGATION USING VIBROSEIS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID EARTHQUAKE PREDICTION; CALIFORNIA; ANISOTROPY AB For more than 3 years the propagation characteristics of shear waves have been monitored for paths near the 1966 hypocenter at Parkfield, the presumed nucleation site for the expected next M6 earthquake there. Data have been collected repeatedly (33 sets as of April 1991) from eight S-wave Vibroseis source positions into the 10 borehole-installed three-component seismometers of the local high-sensitivity digital network. Twenty-second correlated records from a 6- to 24-Hz sweep are acquired, and the entire seismogram is viewed for analysis as the elastic response of the local crustal structure, which includes the San Andreas fault zone. Amplitudes, travel times, spectra, and particle motions of the P and S waves are monitored for indications of any changes in these properties that may be attributed to processes associated with nucleation. The horizontal vibrator at each source point is positioned at three surface-orientations to study anisotropy. Unorthodox methods have been developed to display the waveform properties in time in order to visualize the resulting massive data sets. The first-order variations seen in some of the parameters are attributed to changes from dry to wet conditions in the shallow subsurface due to the seasonal rainfall, which affects the source function of the vibrator. Corrections have been devised for these source-specific variations. Secular variations not obviously coupled to seasonal near-surface changes are also seen in some localized time intervals within the 20-sec records. The most striking of such changes is a progressive travel-time decrease at rates of 3 to 7 msec / year seen for late arrivals (7 to 11 sec travel time) on at least five paths into station VCA, which sample the region southeast of the anticipated epicenter at Middle Mountain. This anomaly appears to be genuine and is now the subject of intensified study. In the same general area, along the fault in the southwestern block, the direct S wave is clearly split, with the faster of the split phases polarized parallel to the fault zone, a result in agreement with that from the VSP survey in the Varian well on the northeast side of the fault. C1 LAWRENCE BERKELEY LAB,DEPT GEOL & GEOPHYS,SEISMOL STN,BERKELEY,CA 94720. RP KARAGEORGI, E (reprint author), LAWRENCE BERKELEY LAB,CTR COMPUTAT SEISMOL,BERKELEY,CA 94720, USA. NR 17 TC 36 Z9 39 U1 1 U2 3 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD JUN PY 1992 VL 82 IS 3 BP 1388 EP 1415 PG 28 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HY197 UT WOS:A1992HY19700011 ER PT J AU HILL, WR AF HILL, WR TI FOOD LIMITATION AND INTERSPECIFIC COMPETITION IN SNAIL-DOMINATED STREAMS SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID INTRASPECIFIC COMPETITION; PERIPHYTON RESPONSES; CADDISFLY POPULATION; LABORATORY STREAM; AQUATIC INSECTS; DISTURBANCE; PHOSPHORUS; MACROINVERTEBRATES; COMMUNITY; EFFICIENCY AB Food limitation and exploitative competition were implicated in two experiments on lotic grazers in eastern Tennessee. In a laboratory feeding experiment, grazing snails (Elimia clavaeformis) and caddisfly larvae (Neophylax etnieri) from upper White Oak Creek (WOC) grew 7 and 2 times faster, respectively, on a diet of high-biomass periphyton than they did on a diet of WOC periphyton. When fed on the high-biomass periphyton, both grazers accumulated disproportionately more neutral lipid, and snails increased their mean condition index 50% (ash-free dry mass per unit wet mass). Growth and condition of grazers fed WOC periphyton in the laboratory were quite similar to growth and condition in situ, indicating that laboratory conditions were realistic. Analysis of gut contents demonstrated considerable dietary overlap between the two taxa regardless of periphyton diet and suggested that quantity rather than quality of periphyton limited grazer growth and condition in WOC. In a natural experiment, periphyton and Neophylax from six streams containing Elimia were compared with periphyton and Neophylax from six streams that lacked Elimia. Periphyton biomass, Neophylax diapause mass, and Neophylax lipid content were substantially greater in streams lacking Elimia, implying that the snail created or exacerbated food-limiting conditions for Neophylax. RP HILL, WR (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 65 TC 56 Z9 56 U1 0 U2 16 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD JUN PY 1992 VL 49 IS 6 BP 1257 EP 1267 PG 11 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA HY493 UT WOS:A1992HY49300022 ER PT J AU JOSLIN, JD WOLFE, MH AF JOSLIN, JD WOLFE, MH TI RED SPRUCE SOIL SOLUTION CHEMISTRY AND ROOT DISTRIBUTION ACROSS A CLOUD WATER DEPOSITION GRADIENT SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID FOREST DECLINE; FIR FORESTS; ACID MIST; SEEDLINGS; ALUMINUM; PATTERNS; STANDS; MATURE; PINE AB The decline of red spruce (Picea rubens Sarg.) at high elevations in eastern North America has been linked in time and space with exposure to acidic cloud water. To investigate the belowground effects of a cloud water deposition gradient between two mature red spruce stands on the summit of Whitetop Mountain, Virginia, the chemistries of precipitation, throughfall, and soil solution were monitored over a 2-year period, and fine-root distributions were characterized. Deposition of water, sulfate, nitrate, and ammonium in throughfall and stemflow was from 15 to 55% greater at the site with greater exposure to cloud water deposition (high cloud site), depending upon the particular ion and year. Soil solution nitrate concentrations were highly variable over time, and base cation, Al, and H ion concentrations were highly correlated with nitrate in both organic and mineral horizons at both sites. Soil solution nitrate, base cation, Al, and H ion concentrations were two to six times greater during periods of low soil moisture in the summer-autumn of 1987 and 1988 than during the remainder of the study period. In the mineral soil solutions, the high cloud site had significantly higher (p < 0.001) concentrations of nitrate and Al, and significantly lower (p < 0.05) Ca:Al and Mg:Al ratios. The high cloud stand also had shallower root systems, with fine-root biomass less than 40% of that of the low cloud stand (p < 0.05) at all depths greater than 18 cm. Soil solutions collected from below 15 cm at the high cloud site had a mean Ca:Al ratio less than 0.5 and Al concentrations that during dry periods, frequently approached or exceeded the literature values for the toxicity threshold for red spruce root growth. Restricted root development in the high cloud stand was apparently the result of this unfavorable chemical environment. RP JOSLIN, JD (reprint author), OAK RIDGE NATL LAB,DEPT ATMOSPHER SCI,COOPERAT FOREST STUDIES PROGRAM,OAK RIDGE,TN 37831, USA. NR 56 TC 44 Z9 46 U1 0 U2 5 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD JUN PY 1992 VL 22 IS 6 BP 893 EP 904 DI 10.1139/x92-119 PG 12 WC Forestry SC Forestry GA JD779 UT WOS:A1992JD77900015 ER PT J AU SOOD, PC SHELINE, RK HOFF, RW AF SOOD, PC SHELINE, RK HOFF, RW TI LEVEL STRUCTURES IN HF-180 FROM THE BETA-DECAY OF LU-180 SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID NUCLEI; ISOTOPES AB Configuration assignments to the levels of Hf-180 populated in the beta decay of the 5.7 min ground state of 180Lu are derived based on the observed beta-transition rates, calculated two-quasiparticle excitation energies, and the observed decay modes of the levels under consideration. Corroborative evidence is sought from the results of the other experimental investigations including (n, gamma), (n, 2gamma), (n, n'gamma), and particle transfer reaction studies. Specifically the 1607.7 and 1742.7 keV levels are assigned the I(pi)K = 4+4 and 5+4 {7/2[514] + 1/2[510]} two-neutron configuration, and the 1374.7 and 1609.7 keV levels are assigned the 4-4 and 5-5 {9/2[6241 -/+ 1/2[510]} two-neutron configuration. C1 FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. BANARAS HINDU UNIV,DEPT PHYS,VARANASI 221005,UTTAR PRADESH,INDIA. LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550. RP SOOD, PC (reprint author), FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306, USA. NR 34 TC 3 Z9 3 U1 1 U2 1 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD JUN PY 1992 VL 70 IS 6 BP 395 EP 400 PG 6 WC Physics, Multidisciplinary SC Physics GA JW240 UT WOS:A1992JW24000004 ER PT J AU KOWLURU, A KOWLURU, RA AF KOWLURU, A KOWLURU, RA TI PHOSPHOLIPID N-METHYLATION IN DIABETIC ERYTHROCYTES - EFFECTS ON MEMBRANE NA+, K+ ATPASE ACTIVITY SO CELL BIOCHEMISTRY AND FUNCTION LA English DT Article DE PHOSPHOLIPID METHYLATION; STREPTOZOTOCIN DIABETES; ERYTHROCYTE NA+, K+ ATPASE ID ADENOSINE-TRIPHOSPHATASE; PANCREATIC-ISLETS; PUMPING ACTIVITY; FLUIDITY; INSULIN; MYOINOSITOL; INVITRO; RATS; PHOSPHATIDYLETHANOLAMINE; PHOSPHATIDYLCHOLINE AB Phospholipid methylation was quantified in non-diabetic and streptozotocin diabetic rat erythrocytes. While the total mass of methylated lipids remained the same in both groups, the relative abundance of individual methylated lipid species differed significantly in diabetic erythrocytes. Moreover. incubation of erythrocytes membranes with S-adenosyl methionine, a substrate for methyl transferases, not only increased membrane lipid methylation but also decreased Na+, K+ ATPase activity significantly. These results suggest that phospholipid methylation may cause the observed depression of erythrocyte Na+, K+ ATPase activity in diabetes and could contribute to the altered rheology of erythrocytes in diabetes. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,MOLEC & CELL BIOL GRP,LOS ALAMOS,NM 87545. NR 35 TC 4 Z9 4 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0263-6484 J9 CELL BIOCHEM FUNCT JI Cell Biochem. Funct. PD JUN PY 1992 VL 10 IS 2 BP 95 EP 101 DI 10.1002/cbf.290100205 PG 7 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA HX087 UT WOS:A1992HX08700004 PM 1321009 ER PT J AU TREWHELLA, J AF TREWHELLA, J TI THE SOLUTION STRUCTURES OF CALMODULIN AND ITS COMPLEXES WITH SYNTHETIC PEPTIDES BASED ON TARGET ENZYME BINDING DOMAINS SO CELL CALCIUM LA English DT Article ID LIGHT-CHAIN KINASE; X-RAY-SCATTERING; RABBIT SKELETAL-MUSCLE; TRANSFORM INFRARED-SPECTROSCOPY; AMINO-ACID-SEQUENCE; TROPONIN-C; PHOSPHORYLASE-KINASE; CENTRAL HELIX; BIOLOGICAL-ACTIVITY; SECONDARY STRUCTURE AB Small-angle X-ray and neutron scattering experiments have given important information on the solution structures of calmodulin and its complexes with synthetic peptides used to model target enzyme interactions. In combination with crystallographic data, site directed mutagenesis and various spectroscopic studies, these experiments have contributed to our understanding of the solution structure of calmodulin in different functional states. We have gained important insights into the conformational flexibility in calmodulin that appears to be crucial to its regulatory functions. Specifically, flexibility in the interconnecting helix region of calmodulin has been shown to play a critical role in facilitating calmodulin's binding to a wide variety of target enzymes whose activities are thus regulated. This review will focus mainly on the contributions small-angle scattering has made to our understanding of the solution structure of calmodulin in the context of other studies, with particular regard to circular dichroism and Fourier transform infrared studies that complement the small-angle scattering data. RP TREWHELLA, J (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. OI Trewhella, Jill/0000-0002-8555-6766 NR 78 TC 37 Z9 37 U1 0 U2 5 PU CHURCHILL LIVINGSTONE PI EDINBURGH PA JOURNAL PRODUCTION DEPT, ROBERT STEVENSON HOUSE, 1-3 BAXTERS PLACE, LEITH WALK, EDINBURGH, MIDLOTHIAN, SCOTLAND EH1 3AF SN 0143-4160 J9 CELL CALCIUM JI Cell Calcium PD JUN-JUL PY 1992 VL 13 IS 6-7 BP 377 EP 390 DI 10.1016/0143-4160(92)90051-S PG 14 WC Cell Biology SC Cell Biology GA JF053 UT WOS:A1992JF05300004 PM 1505003 ER PT J AU YASWEN, P SMOLL, A HOSODA, J PARRY, G STAMPFER, MR AF YASWEN, P SMOLL, A HOSODA, J PARRY, G STAMPFER, MR TI PROTEIN PRODUCT OF A HUMAN INTRONLESS CALMODULIN-LIKE GENE SHOWS TISSUE-SPECIFIC EXPRESSION AND REDUCED ABUNDANCE IN TRANSFORMED-CELLS SO CELL GROWTH & DIFFERENTIATION LA English DT Article ID MAMMARY EPITHELIAL-CELLS; PSEUDOGENE; VERTEBRATE; SEQUENCES; PASSAGE; GROWTH; CYCLE; ACID; SITE AB The recently identified NB-1 mRNA is transcribed from a single intronless gene, previously thought to be an unexpressed calmodulin pseudogene. Although expression levels of the three known human calmodulin genes fluctuate only slightly in all cell types and tissues examined, NB-1 expression is limited to certain cells of pseudostratified and stratified epithelial tissues. Like calmodulin, the protein encoded by NB-1 is heat stable and binds to phenyl-Sepharose in a calcium-dependent manner. Despite the shared identity of 85% of their 148 amino acids, however, calmodulin and NB-1 protein are easily distinguished electrophoretically and immunologically. Polyclonal antibodies prepared against recombinant NB-1 protein recognize a protein with an apparent molecular weight of 16,000 which is abundant in cultured normal human mammary epithelial cells, but which is absent or barely detectable in fibroblasts or tumor cell lines. The immunohistochemical distribution of NB-1 protein in histologically normal tissues suggests that expression of the gene is regulated during epithelial differentiation. The majority of a small number of malignant tissues examined had lowered or undetectable NB-1 protein expression relative to normal tissues. Given its restricted distribution, the NB-1 protein may be involved in the initiation or maintenance of certain differentiated functions. Its absence may be due to or necessary for the manifestation of the transformed phenotype in certain cell types. RP YASWEN, P (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BLDG 934-47A,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA-24844, CA-08359] NR 47 TC 30 Z9 30 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 1044-9523 J9 CELL GROWTH DIFFER JI Cell Growth Differ. PD JUN PY 1992 VL 3 IS 6 BP 335 EP 345 PG 11 WC Cell Biology SC Cell Biology GA HY017 UT WOS:A1992HY01700001 PM 1419896 ER PT J AU SU, CM HARSH, JB BERTSCH, PM AF SU, CM HARSH, JB BERTSCH, PM TI SODIUM AND CHLORIDE SORPTION BY IMOGOLITE AND ALLOPHANES SO CLAYS AND CLAY MINERALS LA English DT Article DE ZERO NET CHARGE; NUCLEAR MAGNETIC RESONANCE; ISOMORPHIC SUBSTITUTION; PZC; ION ADSORPTION; PERMANENT CHARGE; SALT ABSORPTION; INTERCALATION ID NUCLEAR MAGNETIC-RESONANCE; SYNTHETIC ALLOPHANE; AL-27; ALUMINUM; SOILS AB The surface excesses of Na and Cl on synthetic imogolite and allophanes with varying Al/Si molar ratios in 0.10 M and 0.01 M NaCl solutions were determined using Na-22 and Cl-36 as ion probes. The point of zero net charge (PZNC) values ranged from 4.1 to 8.4, increasing with the Al/Si molar ratio for the allophanes, and was highest for imogolite (Al/Si = 2.01). The PZNC values were significantly lower than the point of zero charge (PZC) values previously determined by microelectrophoresis for the same material, indicating that Na resided within the shear plane to a greater extent than Cl. The PZNC values of allophanes were lower than their PZSE values, indicating that permanent charge existed in allophanes, and increased as Al/Si decreased. Conversely, the PZNC of imogolite was higher than its point of zero salt effect (PZSE) determined by potentiometric titration. Adsorption of Cl on imogolite from 0.1 and 0.01 M NaCl solutions below pH 8.4 and of Na from 0.1 M NaCl solutions between pH 5 and 8.4 exceeded the proton charge determined by potentiometric titration. There was no direct evidence of permanent charge in imogolite and excess Cl adsorption could not be entirely explained by simultaneous intercalation of Na and Cl. Isomorphic substitution of Al in tetrahedral sites was shown to increase with decreasing Al/Si by Al-27 high-resolution solid-state nuclear magnetic resonance (NMR) spectra of allophanes, and was absent in imogolite. The chemical shifts of Al(4) and Al(6) were similar in allophanes (63.0-64.7 ppm and 6.1-7.8 ppm, respectively) and the chemical shift of Al(6) was 9.4 in imogolite. C1 UNIV GEORGIA,DIV BIOGEOCHEM,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP SU, CM (reprint author), WASHINGTON STATE UNIV,COLL AGR & HOME ECON,DEPT CROP & SOIL SCI,PULLMAN,WA 99164, USA. RI Harsh, James/C-7455-2014 OI Harsh, James/0000-0002-0177-3342 NR 21 TC 25 Z9 26 U1 0 U2 7 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD JUN PY 1992 VL 40 IS 3 BP 280 EP 286 DI 10.1346/CCMN.1992.0400305 PG 7 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA JW964 UT WOS:A1992JW96400005 ER PT J AU WALKER, JR BISH, DL AF WALKER, JR BISH, DL TI APPLICATION OF RIETVELD REFINEMENT TECHNIQUES TO A DISORDERED-IIB MG-CHAMOSITE SO CLAYS AND CLAY MINERALS LA English DT Article DE CHLORITE; DISORDER; RIETVELD REFINEMENT ID CLAY-MINERALS; DIFFRACTION AB The structure of a disordered IIb Mg-chamosite was studied using Rietveld refinement techniques and powder X-ray diffraction (CuKalpha, 18-120-degrees 2theta in 0.02-degrees 2theta increments). The refinement in space group C1BAR yielded high precision lattice parameters (a = 5.36982(5)angstrom, b = 9.3031(9)angstrom, c = 14.2610(6)angstrom, alpha = 90.315(5)-degrees, beta = 97.234(7)-degrees, gamma = 90.022(9)-degrees) and atomic coordinates very similar to previous studies. However, the presence of semi-random stacking in this specimen created a situation in which not all atoms could be precisely located: the positions of the octahedral cations and anions which repeat at intervals of +/-b/3 could be uniquely determined in three dimensions whereas only the z parameter of the other atoms could be refined. The reasonable appearance of the final model, despite the fact that many of the atom positions could be located in only one dimension, may have resulted because all of the atoms in this structure except O(5) repeat at intervals which are very nearly +/-b/3. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP WALKER, JR (reprint author), VASSAR COLL,DEPT GEOL & GEOG,POUGHKEEPSIE,NY 12601, USA. NR 21 TC 7 Z9 7 U1 1 U2 2 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD JUN PY 1992 VL 40 IS 3 BP 319 EP 322 DI 10.1346/CCMN.1992.0400311 PG 4 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA JW964 UT WOS:A1992JW96400011 ER PT J AU HAMSTRA, JR FINK, RL AF HAMSTRA, JR FINK, RL TI FFOL TRANSMISSION SERVICES - ISSUES FOR A PHY PHYSICAL LAYER PROTOCOL SO COMPUTER COMMUNICATIONS LA English DT Article DE FFOL; PHYSICAL LAYER PROTOCOL; TRANSMISSION SERVICES; STANDARDIZATION; PHY AB The FDDI Follow-On LAN (FFOL) standard is being developed as a successor to FDDI. FFOL, like FDDI, consists of several standards, each a part of the whole. The lower three layers of FFOL standards provide the Transmission Services of FFOL These are a Physical Layer Medium Dependent (PMD) standard, a Physical Layer Protocol (PHY) standard, and a Service Multiplexer (SMUX) standard. This paper discusses the issues affecting the development of the PHY standard. These include the FFOL physical topology and the PHY functions required to support the other FFOL standards. Future papers in this Computer Communications series on FFOL will discuss the SMUX and PMD components of Transmission Services. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HAMSTRA, JR (reprint author), STANATEK,SHOREWOOD,MN, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD JUN PY 1992 VL 15 IS 5 BP 305 EP 310 DI 10.1016/0140-3664(92)90091-R PG 6 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA HV463 UT WOS:A1992HV46300004 ER PT J AU LEE, DK AF LEE, DK TI CALCULATION OF COEFFICIENTS IN A POWER-SERIES EXPANSION OF THE NOME Q = EXP[-PI-K(K')/K(K)] SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article AB A recurrence relation is derived for expansion coefficients in a power series of the nome q = exp[ - pi-K(k')/K(k)] = SIGMA-a(m)-lambda-4m + 1, where K(k) is the complete elliptic integral of the first kind, k' = (1 - k2)1/2, and lambda = 1/2(1 - k'1/2)/(1 + k'1/2). A simple numerical method based on the recurrence relation is developed for calculation of the coefficients a(m). Analysis of errors arising from truncation of the power series for q suggests that numerical evaluation of q from this series is more useful than other known methods, except when k is very close to unity. RP LEE, DK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD JUN PY 1992 VL 70 IS 2 BP 292 EP 296 DI 10.1016/0010-4655(92)90194-4 PG 5 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JA304 UT WOS:A1992JA30400005 ER PT J AU JADACH, S RICHTERWAS, E WARD, BFL WAS, Z AF JADACH, S RICHTERWAS, E WARD, BFL WAS, Z TI MONTE-CARLO PROGRAM BHLUMI 2.01 FOR BHABHA SCATTERING AT LOW ANGLES WITH YENNIE-FRAUTSCHI-SUURA EXPONENTIATION SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID HARD PHOTON CORRECTIONS; RADIATIVE-CORRECTIONS; PAIR PRODUCTION; E+E ANNIHILATION; CROSS-SECTION; HIGH-ENERGIES; SOFT PHOTONS; Z0 REGION; DISTRIBUTIONS; GENERATORS AB A Monte Carlo program for small-angle Bhabha scattering with an overall precision of 0.25% is presented. The QED calculation at this precision level is of vital importance for luminosity measurements at LEP/SLC experiments. BHLUMI is a stand-alone Monte Carlo event generator with three sub-generators: BHLUM2, LUMLOG and OLDBIS. The first of them is based on Yennie-Frautschi-Suura O(alpha) exponentiation and the two other ones serve, essentially, to cross-check results from the first one. LUMLOG represents pure leading-logarithmic calculation up to O(L3-alpha-3) and OLDBIS represents ordinary (non-exponentiated) O(alpha) calculation. The important advantage of LUMLOG and OLDBIS is that they feature a very high technical precision of 0.02%. All three sub-generators form a very powerful tool box of programs for precise calculations of QED corrections to the luminosity measurements in present e +/- annihilation experiments. C1 CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. JAGIELLONIAN UNIV,CHAIR COMP SCI,PL-31007 KRAKOW,POLAND. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. RP JADACH, S (reprint author), JAGIELLONIAN UNIV,INST PHYS,UL REYMONTA 4,PL-31007 KRAKOW,POLAND. NR 41 TC 125 Z9 126 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD JUN PY 1992 VL 70 IS 2 BP 305 EP 344 DI 10.1016/0010-4655(92)90196-6 PG 40 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JA304 UT WOS:A1992JA30400007 ER PT J AU WORLEY, PH DRAKE, JB AF WORLEY, PH DRAKE, JB TI PARALLELIZING THE SPECTRAL TRANSFORM METHOD SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article AB The spectral transform method is a standard numerical technique used to solve partial differential equations on the sphere in global climate modeling. In particular, it is used in CCM1 and CCM2, the Community Climate Models developed at the National Center for Atmospheric Research. This paper describes initial experiences in parallelizing a program that uses the spectral transform method to solve the non-linear shallow water equations on the sphere, showing that an efficient implementation is possible on the Intel iPSC/860. The use of PICL, a portable instrumented communication library, and ParaGraph, a performance visualization tool, in tuning the implementation is also described. The Legendre transform and the Fourier transform comprise the computational kernel of the spectral transform method. This paper is a case study of parallelizing the Legendre transform. For many problem sizes and numbers of processors, the spectral transform method can be parallelized efficiently by parallelizing only the Legendre transform. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. NR 39 TC 11 Z9 11 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1040-3108 J9 CONCURRENCY-PRACT EX JI Concurrency-Pract. Exp. PD JUN PY 1992 VL 4 IS 4 BP 269 EP 291 DI 10.1002/cpe.4330040402 PG 23 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JA362 UT WOS:A1992JA36200001 ER PT J AU GEIST, GA SUNDERAM, VS AF GEIST, GA SUNDERAM, VS TI NETWORK-BASED CONCURRENT COMPUTING ON THE PVM SYSTEM SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article AB Concurrent computing environments based on loosely coupled networks have proven effective as resources for multiprocessing. Experiences with and enhancements to version 1.0 of PVM (Parallel Virtual Machine) are described in this paper. PVM is a software package that allows the utilization of a heterogeneous network of parallel and serial computers as a single computational resource. This report also describes an interactive graphical interface to PVM, and porting and performance results from production applications. C1 EMORY UNIV,DEPT MATH & COMP SCI,ATLANTA,GA 30322. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,MATH SCI SECT,OAK RIDGE,TN 37831. NR 25 TC 102 Z9 102 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1040-3108 J9 CONCURRENCY-PRACT EX JI Concurrency-Pract. Exp. PD JUN PY 1992 VL 4 IS 4 BP 293 EP 311 DI 10.1002/cpe.4330040403 PG 19 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JA362 UT WOS:A1992JA36200002 ER PT J AU FRAZER, NB AF FRAZER, NB TI SEA-TURTLE CONSERVATION AND HALFWAY TECHNOLOGY SO CONSERVATION BIOLOGY LA English DT Article AB How we define a problem often determines what we are willing to consider as a solution. When we define the impending extinction of a sea turtle species solely in terms of there being too few turtles, we are tempted to think of solutions solely in terms of increasing the numbers of turtles. Hence, some of our attempts to conserve sea turtles involve "halfway technology," which does not address the causes of or provide amelioration for the actual threats turtles face. Programs such as headstarting, captive breeding, and hatcheries may serve only to release more turtles into a degraded environment in which their parents have already demonstrated that they cannot flourish. Furthermore, captive programs may keep turtles from serving important ecological functions in the natural environment, or place them at some disadvantage relative to their natural counterparts once released Such programs can be contrasted with more appropriate technologies that directly address and correct particular problems encountered by sea turtles without removing them from their natural habitat For example, installing turtle excluder devices in shrimp trawl nets will reduce mortality of adults and larger juvenile sea turtles, and using low pressure sodium lighting on beaches may prevent hatchlings and nesting females from becoming disoriented In the final analysis we need clean and productive marine and coastal environments. Without a commitment to such long term goals, efforts to protect sea turtles will be futile. RP FRAZER, NB (reprint author), SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. NR 0 TC 78 Z9 83 U1 3 U2 38 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 SN 0888-8892 J9 CONSERV BIOL JI Conserv. Biol. PD JUN PY 1992 VL 6 IS 2 BP 179 EP 184 DI 10.1046/j.1523-1739.1992.620179.x PG 6 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA HW990 UT WOS:A1992HW99000007 ER PT J AU CHEN, WYC ROTA, GC AF CHEN, WYC ROTA, GC TI Q-ANALOGS OF THE INCLUSION EXCLUSION-PRINCIPLE AND PERMUTATIONS WITH RESTRICTED POSITION SO DISCRETE MATHEMATICS LA English DT Article ID FINITE VECTOR-SPACES; COMBINATORIAL THEORY; FOUNDATIONS; FIELD; PROOF AB We derive a q-analog of the principle of inclusion-exclusion, and use it to derive a q-analog of the Kaplansky-Riordan theory of permutations with restricted position. Some analogies with the theory of Mahonian statistics are pointed out at the end, leading to a conjectured relationship between the two. C1 MIT,DEPT MATH,CAMBRIDGE,MA 02139. RP CHEN, WYC (reprint author), LOS ALAMOS NATL LAB,C-3,MAIL STOP B265,LOS ALAMOS,NM 87545, USA. NR 32 TC 18 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-365X J9 DISCRETE MATH JI Discret. Math. PD JUN 1 PY 1992 VL 104 IS 1 BP 7 EP 22 DI 10.1016/0012-365X(92)90622-M PG 16 WC Mathematics SC Mathematics GA JF753 UT WOS:A1992JF75300002 ER PT J AU THOMSON, RE DELANEY, JR MCDUFF, RE JANECKY, DR MCCLAIN, JS AF THOMSON, RE DELANEY, JR MCDUFF, RE JANECKY, DR MCCLAIN, JS TI PHYSICAL CHARACTERISTICS OF THE ENDEAVOR RIDGE HYDROTHERMAL PLUME DURING JULY 1988 SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID DE-FUCA RIDGE; VENT FIELD; OCEAN; ENTRAINMENT; TRANSPORT; RATES; FLUX; FLOW AB We conducted CTD-transmissometer tows from 8 to 26 July, 1988 within 15 km of the central hydrothermal vent site (almost-equal-to 47-degrees 57-degrees N, 129-degrees 06'W) on the Endeavour segment of Juan de Fuca Ridge. Anomalies of temperature, salinity and light attenuation reveal possible new vent sites 4 and 8 km northeast and 6 km south of the central vent site. As a result of widespread plume dispersion, background values of potential temperature, salinity and light attenuation below the 1900 m depth exceeded those for "pristine" ambient waters by 0.05-degrees-C, 0.05 psu and 0.03 m-1, respectively. Maximum plume anomalies relative to the background waters were of the order of 0.10-degrees-C, 0.010 psu and 0.10 m-1 at core depths of 2000-2050 m. Heat and salt anomalies were detectable more than 5 km from the central vent site whereas light attenuation (particle) anomalies were confined to within 2.5 km of the vent site. Based on the background water property anomalies and moored current meter records, the mean (time-averaged) heat fluxes for the survey region were +2.3(+/- 1.5) x 10(8) W in the along-ridge direction (20-degrees-T) and -7.7(+/- 4.7) x 10(8) W in the cross-ridge direction (110-degrees-T). Mean along- and cross-ridge salt fluxes were +7(+/- 5) and -25(+/- 15) kg s-1; mean particle fluxes were +0.09(+/- 0.06) and -0.29(+/- 0.18) kg s-1. Estimates of the instantaneous fluxes derived from coincident current and plume measurements indicate that heat fluxes from the central vent field may have been as high as 1.2(+/- 0.6)x10(10) W and corresponding particulate fluxes as high as 6(+/- 3) kg s-1. C1 UNIV WASHINGTON,SCH OCEANOG,SEATTLE,WA 98195. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF DAVIS,DEPT GEOL,DAVIS,CA 95616. RP THOMSON, RE (reprint author), INST OCEAN SCI,9860 W SAANICH RD,SIDNEY V8L 4B2,BC,CANADA. NR 30 TC 63 Z9 64 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD JUN PY 1992 VL 111 IS 1 BP 141 EP 154 DI 10.1016/0012-821X(92)90175-U PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JE267 UT WOS:A1992JE26700012 ER PT J AU WATSON, AP JONES, TD ADAMS, JD AF WATSON, AP JONES, TD ADAMS, JD TI RELATIVE POTENCY ESTIMATES OF ACCEPTABLE RESIDUES AND REENTRY INTERVALS AFTER NERVE AGENT RELEASE SO ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY LA English DT Article ID PESTICIDE-RESIDUES C1 US EPA,OFF PESTICIDE PROGRAMS,WASHINGTON,DC 20460. RP WATSON, AP (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,OAK RIDGE,TN 37831, USA. NR 39 TC 6 Z9 6 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0147-6513 J9 ECOTOX ENVIRON SAFE JI Ecotox. Environ. Safe. PD JUN PY 1992 VL 23 IS 3 BP 328 EP 342 DI 10.1016/0147-6513(92)90082-E PG 15 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA HY368 UT WOS:A1992HY36800008 PM 1376237 ER PT J AU LUCAS, JP AF LUCAS, JP TI DELAMINATION FRACTURE - EFFECT OF FIBER ORIENTATION ON FRACTURE OF A CONTINUOUS FIBER COMPOSITE LAMINATE SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID GRAPHITE-EPOXY; CRACK DEFLECTION; INTERLAMINAR; TOUGHNESS; PEEK; MORPHOLOGY; MECHANISMS; MOISTURE; GROWTH; MODE AB Delamination fracture toughness (DFT) of continuous fiber reinforced resin matrix composites is of significant interest because failure by delamination is considered to be the weak link in the fracture process. In this investigation, the effect of fiber orientation on delamination fracture toughness was examined. A modified version of the monolithic short bar test specimen (the hybrid short bar, HSB) was used to determine DFT in relationship to the orientation of the reinforcing fibers. The fracture toughness was determined for a graphite/epoxy composite laminate in which the crack direction-fiber orientation (CD/FO) angle varied from 0 to 90-degrees. The fracture toughness increased as the CD/FO angle increased. The observed increase in fracture toughness as a function of fiber misorientation was attributed to deviant crack tip behavior. Misorientation of the fibers promoted crack tip bifurcation, deflection, and twisting. Such deviant behavior increased mixed mode fracture character locally at the crack tip; and as a consequence, the near field stress intensity at the crack tip was reduced. Since the local crack tip driving force is reduced, the applied load must be increased to advance fracture in the laminate, hence, an apparent increase in the DFT is observed. Results showed that the fracture toughness increased by nearly a factor of 2 as the CD/FO angle increased from 0 to 90-degrees. RP LUCAS, JP (reprint author), SANDIA NATL LABS,DIV ORGAN & COMPOSITE MAT,LIVERMORE,CA 94551, USA. NR 30 TC 16 Z9 16 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD JUN PY 1992 VL 42 IS 3 BP 543 EP 561 DI 10.1016/0013-7944(92)90173-C PG 19 WC Mechanics SC Mechanics GA HY980 UT WOS:A1992HY98000011 ER PT J AU BLACKWOOD, LG AF BLACKWOOD, LG TI THE LOGNORMAL-DISTRIBUTION, ENVIRONMENTAL DATA, AND RADIOLOGICAL MONITORING SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article AB The lognormal distribution has become a common choice to represent intrinsically positive and often highly skewed environmental data in statistical analysis. However the implications of its use are often not carefully considered. With an emphasis on radiological monitoring applications, this paper reviews what assuming lognormality means in terms of data analysis and interpretation. The relationship of using normal theory methods on log transformed data to multiplicative errors and hypothesis testing in the original scale is also discussed. RP BLACKWOOD, LG (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 0 TC 17 Z9 17 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-6369 J9 ENVIRON MONIT ASSESS JI Environ. Monit. Assess. PD JUN PY 1992 VL 21 IS 3 BP 193 EP 210 DI 10.1007/BF00399687 PG 18 WC Environmental Sciences SC Environmental Sciences & Ecology GA JA961 UT WOS:A1992JA96100003 PM 24234486 ER PT J AU GAFFNEY, JS MARLEY, NA ORLANDINI, KA AF GAFFNEY, JS MARLEY, NA ORLANDINI, KA TI EVIDENCE FOR THORIUM ISOTOPIC DISEQUILIBRIA DUE TO ORGANIC COMPLEXATION IN NATURAL-WATERS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Note ID RATE CONSTANTS; URANIUM; GROUNDWATERS; RADIUM RP GAFFNEY, JS (reprint author), ARGONNE NATL LAB,DIV REACTOR ANAL & SAFETY,DIV ENVIRONM RES,BLDG 203,ARGONNE,IL 60439, USA. NR 23 TC 14 Z9 15 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD JUN PY 1992 VL 26 IS 6 BP 1248 EP 1250 DI 10.1021/es50002a615 PG 3 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HX727 UT WOS:A1992HX72700030 ER PT J AU SMITH, RW JENNE, EA AF SMITH, RW JENNE, EA TI RECALCULATION, EVALUATION, AND PREDICTION OF SURFACE COMPLEXATION CONSTANTS FOR METAL ADSORPTION ON IRON AND MANGANESE OXIDES - COMMENT SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Letter C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP SMITH, RW (reprint author), IDAHO NATL ENGN LAB, IDAHO FALLS, ID 83415 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD JUN PY 1992 VL 26 IS 6 BP 1253 EP 1254 DI 10.1021/es50002a617 PG 2 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HX727 UT WOS:A1992HX72700032 ER PT J AU ECKE, RE ZHONG, F KNOBLOCH, E AF ECKE, RE ZHONG, F KNOBLOCH, E TI HOPF-BIFURCATION WITH BROKEN REFLECTION SYMMETRY IN ROTATING RAYLEIGH-BENARD CONVECTION SO EUROPHYSICS LETTERS LA English DT Article DE HYDRODYNAMIC STABILITY AND INSTABILITY; TURBULENT FLOWS, CONVECTION, AND HEAT TRANSFER ID DYNAMICS; WAVES AB Experimental observations of azimuthally traveling waves in rotating Rayleigh-Benard convection in a circular container are presented and described in terms of the theory of bifurcation with symmetry. The amplitude of the convective states varies as square-root-epsilon and the traveling-wave frequency depends linearly on epsilon with a finite value at onset. Here epsilon = R/R(c) - 1, where R(c) the critical Rayleigh number. The onset value of the frequency decreases to zero as the dimensionless rotation rate-OMEGA decreases to zero. These experimental observations are consistent with the presence of a Hopf bifurcation from the conduction state expected to arise when rotation breaks the reflection symmetry in vertical planes of the nonrotating apparatus. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. OI Ecke, Robert/0000-0001-7772-5876 NR 14 TC 55 Z9 55 U1 0 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JUN 1 PY 1992 VL 19 IS 3 BP 177 EP 182 DI 10.1209/0295-5075/19/3/005 PG 6 WC Physics, Multidisciplinary SC Physics GA HZ347 UT WOS:A1992HZ34700005 ER PT J AU SUCK, JB EGELSTAFF, PA ROBINSON, RA SIVIA, DS TAYLOR, AD AF SUCK, JB EGELSTAFF, PA ROBINSON, RA SIVIA, DS TAYLOR, AD TI BRILLOUIN-SCATTERING WITH NEUTRONS IN AN AMORPHOUS SOLID SO EUROPHYSICS LETTERS LA English DT Article DE VIBRATIONAL STATES IN DISORDERED SYSTEMS ID METALLIC-GLASS; DISPERSION AB The dispersion of collective models in the amorphous solid, Mg70Zn30, has been determined down to momentum transfers below the first pseudo-Brillouin zone for the first time using epithermal neutrons at the high-resolution time-of-flight spectrometer HET at the spallation source ISIS. In the region of Q values, where the previous experiment done with thermal neutrons and the present experiment overlap, the two sets of results agree very well. Also the previous discrepancies with the dispersion determined from the calculated one-phonon spectral function for the same metallic glass reported earlier are now less severe in the comparison with a more recent and more complete theoretical investigation of the dynamics of this glass. The extension into the first pseudo-Brillouin zone by neutron Brillouin scattering now allows this dispersion branch to be assigned to predominantly longitudinal excitations. Previously, it was erroneously assumed to be a transverse branch due to the discrepancies with the earlier theoretical results. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH, INST NUKL FESTKORPERPHYS, W-7500 KARLSRUHE 1, GERMANY. UNIV GUELPH, DEPT PHYS, GUELPH N1G 2W1, ONTARIO, CANADA. LOS ALAMOS NATL LAB, LOS ALAMOS NEUTRON SCATTERING CTR, LOS ALAMOS, NM 87545 USA. RUTHERFORD APPLETON LAB, ISIS FACIL, DIDCOT OX11 0QX, OXON, ENGLAND. RP SUCK, JB (reprint author), INST LAUE LANGEVIN, BP 156, F-38042 GRENOBLE 9, FRANCE. NR 13 TC 26 Z9 26 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JUN 1 PY 1992 VL 19 IS 3 BP 207 EP 213 DI 10.1209/0295-5075/19/3/010 PG 7 WC Physics, Multidisciplinary SC Physics GA HZ347 UT WOS:A1992HZ34700010 ER PT J AU DEFONTAINE, D ASTA, M CEDER, G MCCORMACK, R VANTENDELOO, G AF DEFONTAINE, D ASTA, M CEDER, G MCCORMACK, R VANTENDELOO, G TI ON THE ASYMMETRIC NEXT-NEAREST-NEIGHBOR ISING-MODEL OF OXYGEN ORDERING IN YBA2CU3OZ SO EUROPHYSICS LETTERS LA English DT Article DE PEROVSKITE PHASE SUPERCONDUCTORS; CRYSTALLOGRAPHIC ASPECTS OF POLYMORPHIC AND ORDER-DISORDER TRANSFORMATIONS; ORDER-DISORDER AND STATISTICAL MECHANICS OF MODEL SYSTEMS ID BASAL-PLANE; PHASE-DIAGRAM AB Basic results concerning oxygen ordering in the superconducting compound YBa2Cu3Oz are briefly summarized. It is shown that, at equilibrium, only infinite-chain structures can be stabilized and those models based on hypothetical (and actually nonphysical) screened Coulomb interactions cannot produce stable ground states. It is suggested that diffraction data (neutrons, X-rays, electrons) from oxygen-lean samples are indicative of metastable displacive transformations, and are not directly related to oxygen ordering. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. UNIV ANTWERP,RIJKSUNIV CTR ANTWERP,B-2020 ANTWERP,BELGIUM. RP DEFONTAINE, D (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 22 TC 33 Z9 33 U1 0 U2 1 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JUN 1 PY 1992 VL 19 IS 3 BP 229 EP 234 PG 6 WC Physics, Multidisciplinary SC Physics GA HZ347 UT WOS:A1992HZ34700013 ER PT J AU FARRAR, CR BAKER, WE AF FARRAR, CR BAKER, WE TI MEASURING THE STIFFNESS OF CONCRETE SHEAR WALLS DURING DYNAMIC TESTS SO EXPERIMENTAL MECHANICS LA English DT Article AB Results from a series of experiments designed to measure the stiffness of low-aspect-ratio, reinforced-concrete shear walls subjected to simulated seismic inputs on a shake table are reported. The geometry of the test structures allows them to be modeled as single-degree-of-freedom systems. Forces were estimated from accelerometer measurements on masses attached to the structures. Dynamic relative-displacement measurements were obtained from groups of strain gages wired in series to act as one continuous gage. Because this method measures relative displacements, potential sources of error associated with unspecified base motion are avoided. Stiffness values determined from the relative displacement measurements were compared with stiffness values determined indirectly from frequency-response functions. Measured accelerometer data were used to calculate the frequency-response functions. The stiffness values determined from the relative-displacement measurements gave results similar to those given by mechanics-of-materials beam theory that accounts for shear deformation. The stiffness values determined from the frequency-response functions were considerably less than those from the theory. C1 UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131. RP FARRAR, CR (reprint author), LOS ALAMOS NATL LAB,MS J576,LOS ALAMOS,NM 87545, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD JUN PY 1992 VL 32 IS 2 BP 179 EP 183 DI 10.1007/BF02324730 PG 5 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA JF521 UT WOS:A1992JF52100013 ER PT J AU BAKER, WE FARRAR, CR AF BAKER, WE FARRAR, CR TI MEASUREMENT OF DYNAMIC RELATIVE DISPLACEMENTS SO EXPERIMENTAL MECHANICS LA English DT Article AB A method for measuring relative displacements on structures subjected to simulated seismic-base excitations is presented. This method uses a group of strain gages, mounted end-to-end and wired in series, as the sensor. Because the sensors are mounted directly to the structure, problems associated with the motion of the mounting hardware are avoided. Prior to their use in dynamic applications, static tests were performed to verify that strain-gage sensors give relative displacement readings that are as accurate as those obtained with conventional displacement transducers. These tests also showed that the hysteresis loops measured with the strain-gage sensors were smaller than those measured with the conventional displacement transducers. At similar load levels, the relative displacement results measured during dynamic tests were similar to those measured during static tests. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BAKER, WE (reprint author), UNIV NEW MEXICO,MECH ENGN,ALBUQUERQUE,NM 87131, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD JUN PY 1992 VL 32 IS 2 BP 184 EP 189 DI 10.1007/BF02324731 PG 6 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA JF521 UT WOS:A1992JF52100014 ER PT J AU HEDRICK, DB PLEDGER, RD WHITE, DC BAROSS, JA AF HEDRICK, DB PLEDGER, RD WHITE, DC BAROSS, JA TI INSITU MICROBIAL ECOLOGY OF HYDROTHERMAL VENT SEDIMENTS SO FEMS MICROBIOLOGY ECOLOGY LA English DT Article DE HYDROTHERMAL VENTS; THERMOPHILES; ARCHAEBACTERIA ID PROKARYOTIC COMMUNITY STRUCTURE; FATTY-ACID PROFILES; DEEP-SEA; REPRODUCIBLE ASSAYS; ESTUARINE SEDIMENTS; LIPIDS; METHANOGEN AB Lipid analysis of a preliminary sampling of the Endeavor Ridge hydrothermal vent site was performed in order to estimate the extent and nature of the diversity of the microbial community. The vent microbial community was found to be highly variable in density and composition. Evidence was found for a dense microbial community of archaebacteria and possibly Thiobacilli in the interior of the flange of a black smoker, a red Beggiatoa-type colony in a sediment sample, and large amounts of polyenoic fatty acids of the type previously found in barophilic eubacteria. Lipid analysis provided a 'snapshot' of the in situ biomass, community structure, and metabolic status of the microbial community, a valuable addition to the techniques available to the microbial ecologist, C1 UNIV WASHINGTON,DEPT OCEANOG,SEATTLE,WA 98195. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37830. RP HEDRICK, DB (reprint author), INST APPL MICROBIOL,10515 RES DR,KNOXVILLE,TN 37932, USA. NR 38 TC 44 Z9 49 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-6496 J9 FEMS MICROBIOL ECOL JI FEMS Microbiol. Ecol. PD JUN PY 1992 VL 101 IS 1 BP 1 EP 10 PG 10 WC Microbiology SC Microbiology GA JA847 UT WOS:A1992JA84700001 ER PT J AU ITO, T SMITH, CL CANTOR, CR AF ITO, T SMITH, CL CANTOR, CR TI AFFINITY CAPTURE ELECTROPHORESIS FOR SEQUENCE-SPECIFIC DNA PURIFICATION SO GENETIC ANALYSIS-BIOMOLECULAR ENGINEERING LA English DT Note ID TRIPLE-HELIX FORMATION; 3-STRANDED DNA; RECA PROTEIN; GENE; RECOGNITION; CLEAVAGE; CLONING; INVITRO; PH AB A new method, affinity capture electrophoresis (ACE), has been developed for the sequence-specific isolation of DNA. The target DNA is complexed with a biotinylated probe and electrophoresed in a gel equipped with a trap of immobilized streptavidin. This selectively captures the target molecule and its biotinylated probe, while other nontarget molecules pass through the trap. The target DNA is subsequently recovered from the trap by destroying the interaction between the target DNA and the biotinylated probe. Two variations of this technique, one using triple-helix formation and the other using hybridization with a uracil-containing DNA probe at the end of the target fragment, proved effective in model experiments. Since this technique requires no denaturation and handles DNA inside an agarose gel matrix, it is, in principle, applicable to the isolation of very large DNAs. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA39782] NR 23 TC 3 Z9 3 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1050-3862 J9 GENET ANAL-BIOMOL E JI Genet. Anal.-Biomol. Eng. PD JUN PY 1992 VL 9 IS 3 BP 96 EP 99 DI 10.1016/1050-3862(92)90005-P PG 4 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA JY655 UT WOS:A1992JY65500005 PM 1476797 ER PT J AU STALLINGS, RL DOGGETT, NA OKUMURA, K WARD, DC AF STALLINGS, RL DOGGETT, NA OKUMURA, K WARD, DC TI CHROMOSOME-16-SPECIFIC REPETITIVE DNA-SEQUENCES THAT MAP TO CHROMOSOMAL REGIONS KNOWN TO UNDERGO BREAKAGE - REARRANGEMENT IN LEUKEMIA-CELLS SO GENOMICS LA English DT Article ID ACUTE MYELOMONOCYTIC LEUKEMIA; INSITU HYBRIDIZATION; MINISATELLITE; GENE C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. YALE UNIV,SCH MED,DEPT HUMAN GENET,NEW HAVEN,CT 06510. RP STALLINGS, RL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545, USA. RI Stallings, Raymond/A-7213-2008 FU NIGMS NIH HHS [GM-00272] NR 26 TC 31 Z9 31 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1992 VL 13 IS 2 BP 332 EP 338 DI 10.1016/0888-7543(92)90249-R PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA HT926 UT WOS:A1992HT92600012 PM 1612592 ER PT J AU ZUCMAN, J DELATTRE, O DESMAZE, C AZAMBUJA, C ROULEAU, G DEJONG, P AURIAS, A THOMAS, G AF ZUCMAN, J DELATTRE, O DESMAZE, C AZAMBUJA, C ROULEAU, G DEJONG, P AURIAS, A THOMAS, G TI RAPID ISOLATION OF COSMIDS FROM DEFINED SUBREGIONS BY DIFFERENTIAL ALU-PCR HYBRIDIZATION ON CHROMOSOME-22-SPECIFIC LIBRARY SO GENOMICS LA English DT Article ID POLYMERASE CHAIN-REACTION; SOMATIC-CELL HYBRID; HUMAN-CHROMOSOMES; HUMAN GENOME; DNA MARKERS; LONG ARM; PROBES; LINES; GENE; MICRODISSECTION C1 INST CURIE,GENET TUMEURS LAB,26 RUE DULM,F-75231 PARIS 05,FRANCE. INST CURIE,CNRS,URA 620,F-75231 PARIS 05,FRANCE. INST INVEST BIOL CLEMENTE ESTABLE,MONTEVIDEO,URUGUAY. MCGILL UNIV,CTR RECH ENUROSCI,MONTREAL H3G 1A4,QUEBEC,CANADA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. OI zucman-rossi, Jessica/0000-0002-5687-0334 NR 23 TC 19 Z9 19 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1992 VL 13 IS 2 BP 395 EP 401 DI 10.1016/0888-7543(92)90259-U PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA HT926 UT WOS:A1992HT92600022 PM 1612598 ER PT J AU FIELDS, CA GRADY, DL MOYZIS, RK AF FIELDS, CA GRADY, DL MOYZIS, RK TI THE HUMAN THE-LTR(O) AND MSTII INTERSPERSED REPEATS ARE SUBFAMILIES OF A SINGLE WIDELY DISTRIBUTED HIGHLY VARIABLE REPEAT FAMILY SO GENOMICS LA English DT Article ID HUMAN GENOME; NUCLEOTIDE-SEQUENCE; HUMAN DNA; REPETITIVE DNA; GENE; ALU; ORGANIZATION; POLYMORPHISM; ELEMENT; LINES C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,COMP RES LAB,LAS CRUCES,NM 88003. OI Fields, Chris/0000-0002-4812-0744 NR 32 TC 20 Z9 20 U1 1 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1992 VL 13 IS 2 BP 431 EP 436 DI 10.1016/0888-7543(92)90264-S PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA HT926 UT WOS:A1992HT92600027 PM 1319393 ER PT J AU TRASK, BJ MASSA, HF BURMEISTER, M AF TRASK, BJ MASSA, HF BURMEISTER, M TI FLUORESCENCE INSITU HYBRIDIZATION ESTABLISHES THE ORDER CEN-DXS28(C7)-DXS67(B24)-DXS68(L1)-TEL IN HUMAN CHROMOSOME-XP21.3 SO GENOMICS LA English DT Note ID DUCHENNE MUSCULAR-DYSTROPHY; HUMAN X-CHROMOSOME; DNA-SEQUENCES; DXS67 B24; DELETION; LOCUS; GENE; INTERPHASE; MARKERS; XP21 C1 UNIV MICHIGAN,SCH MED,MENTAL HLTH RES INST,ANN ARBOR,MI 48104. RP TRASK, BJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,L-452,POB 5507,LIVERMORE,CA 94550, USA. RI Burmeister, Margit/A-3157-2013 OI Burmeister, Margit/0000-0002-1914-2434 FU NHGRI NIH HHS [R01 HG-00256-01] NR 15 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUN PY 1992 VL 13 IS 2 BP 455 EP 457 DI 10.1016/0888-7543(92)90271-S PG 3 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA HT926 UT WOS:A1992HT92600034 PM 1612605 ER PT J AU EARY, LE AF EARY, LE TI THE SOLUBILITY OF AMORPHOUS AS2S3 FROM 25 TO 90-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID EXISTING EXPERIMENTAL-DATA; SB(III) SULFIDE COMPLEXES; HYDROGEN-SULFIDE; GOLD DEPOSITION; APPARENT MOLAL; 25-DEGREES-C; STOICHIOMETRY; TEMPERATURES; ADSORPTION; SPECIATION AB The solubility of amorphous arsenic sulfide [As2S3(am)] has been experimentally determined from 25 to 90-degrees-C. In acidic, sulfide-deficient solutions, H3AsO30 is the dominant product of As2S3(am) dissolution: 1/2 As2S3(am) + 3 H2O = H3AsO30 + 3/2 H2S0. The respective logarithms of equilibrium constants for this reaction are -11.9 +/- 0.3 at 25-degrees-C, -11.2 +/- 0.2 at 40-degrees-C, -10.2 +/- 0.1 at 60-degrees-C, and -9.0 +/- 0.2 at 90-degrees-C, all at 0.1 m ionic strength. In acidic solutions with excess sulfide, experimental data are consistent with H2As3S6- being the dominant dissolved As species: 3/2 As2S3(am) + 3/2 H2S0 = H2As3S6- + H+. The respective logarithms of equilibrium constants for this reaction are -5.0 +/- 0.3 at 25-degrees-C, -5.1 +/- 0.3 at 40-degrees-C, -4.9 +/- 0.2 at 60-degrees-C, and -4.1 +/- 0.1 at 90-degrees-C, all at 0.1 m ionic strength. Speciation calculations for a number of acidic hot springs indicate that many have As and H2S0 concentrations that are bracketed by the solubilities of As2S3(am) and orpiment and that H3AsO30 is generally the dominant dissolved As species. The solubility data indicate that lowering of temperature and pH are the most likely mechanisms of As2S3(am) precipitation in hot spring systems. RP EARY, LE (reprint author), PACIFIC NW LAB, POB 999, MS K6-81, RICHLAND, WA 99352 USA. NR 35 TC 89 Z9 89 U1 1 U2 19 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD JUN PY 1992 VL 56 IS 6 BP 2267 EP 2280 DI 10.1016/0016-7037(92)90188-O PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HZ452 UT WOS:A1992HZ45200007 ER PT J AU STERNER, SM CHOU, IM DOWNS, RT PITZER, KS AF STERNER, SM CHOU, IM DOWNS, RT PITZER, KS TI PHASE-RELATIONS IN THE SYSTEM NACL-KCL-H2O .5. THERMODYNAMIC-PTX ANALYSIS OF SOLID-LIQUID EQUILIBRIA AT HIGH-TEMPERATURES AND PRESSURES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID DIFFERENTIAL THERMAL-ANALYSIS; NACL-H2O; CHLORIDE; MIXTURES; EQUATION; HALITE; STATE; BARS AB The Gibbs energies of mixing for NaCl-KCl binary solids and liquids and solid-saturated NaCl-KCl-H2O ternary liquids were modeled using asymmetric Margules treatments. The coefficients of the expressions were calibrated using an extensive array of binary solvus and solidus data, and both binary and ternary liquidus data. Over the PTX range considered, the system exhibits complete liquid miscibility among all three components and extensive solid solution along the anhydrous binary. Solid-liquid and solid-solid phase equilibria were calculated by using the resulting equations and invoking the equality of chemical potentials of NaCl and KCl between appropriate phases at equilibrium. The equations reproduce the ternary liquidus and predict activity coefficients for NaCl and KCl components in the aqueous liquid under solid-saturation conditions between 673 and 1200 K from vapor saturation up to 5 kbar. In the NaCl-KCl anhydrous binary system, the equations describe phase equilibria and predict activity coefficients of the salt components for all stable compositions of solid and liquid phases between room temperature and 1200 K and from 1 bar to 5 kbar. C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. US GEOL SURVEY, RESTON, VA 22092 USA. VIRGINIA POLYTECH INST & STATE UNIV, DEPT GEOL SCI, BLACKSBURG, VA 24061 USA. RP UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. NR 20 TC 42 Z9 42 U1 2 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD JUN PY 1992 VL 56 IS 6 BP 2295 EP 2309 DI 10.1016/0016-7037(92)90190-T PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HZ452 UT WOS:A1992HZ45200009 ER PT J AU THOMPSON, ML SINGH, P CORAK, S STRASZHEIM, WE AF THOMPSON, ML SINGH, P CORAK, S STRASZHEIM, WE TI CAUTIONARY NOTES FOR THE AUTOMATED-ANALYSIS OF SOIL PORE-SPACE IMAGES SO GEODERMA LA English DT Article; Proceedings Paper CT SYMP ON DIGITIZATION, PROCESSING AND QUANTITATIVE INTERPRETATION OF IMAGE ANALYSIS IN SOIL SCIENCE AND RELATED AREAS, AT THE MEETING OF THE SOIL SCIENCE SOC OF AMERICA CY OCT 21-26, 1990 CL SAN ANTONIO, TX SP SOIL SCI SOC AMER, SOIL MICROMORPHOL COMM ID SATURATED HYDRAULIC CONDUCTIVITY; MACROPORE STRUCTURE; RAPID METHOD; TILLED SOIL; 2 SOILS; IMPREGNATION; PRINCIPLES; MODEL AB The commercial development of relatively low-cost, software-based image-analyzing systems has made automated analysis of two-dimensional images of soil pore space attractive to a number of soil science laboratories. Such analyses are not necessarily straightforward, however, because the available measurement programs were not designed to be used with images as complex as those of many soils. Each laboratory must address a number of relevant problems before meaningful analyses and comparisons can begin. The problems include: (1) establishing adequate contrast between pores and soil matrix on the image; (2) determining the appropriate number of samples and images per sample to analyze; (3) choosing images representative of pore space at the scale (magnification) of interest; (4) developing and standardizing image-segmentation protocols; (5) standardizing indexes of pore shape; (6) determining when measurements of pore individuals are inappropriate; (7) identifying relevant statistical tests to compare pore-space patterns; and (8) relating the data generated by image analysis to soil behavior. By controlling as many variables as possible during image preparation and by applying fundamental stereological and statistical principles, researchers can use image analysis as an important tool to study soil pore space. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT AGR & BIOSYST ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CIVIL & CONSTRUCT ENGN,AMES,IA 50011. RP THOMPSON, ML (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT AGRON,AMES,IA 50011, USA. NR 39 TC 23 Z9 23 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0016-7061 J9 GEODERMA JI Geoderma PD JUN PY 1992 VL 53 IS 3-4 BP 399 EP 415 DI 10.1016/0016-7061(92)90067-H PG 17 WC Soil Science SC Agriculture GA JG283 UT WOS:A1992JG28300015 ER PT J AU KING, SD GABLE, CW WEINSTEIN, SA AF KING, SD GABLE, CW WEINSTEIN, SA TI MODELS OF CONVECTION-DRIVEN TECTONIC PLATES - A COMPARISON OF METHODS AND RESULTS SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE CONVECTION; EARTHS MANTLE; PLATE TECTONICS ID MANTLE CONVECTION AB Recent numerical studies of convection in the Earth's mantle have included various features of plate tectonics. A number of different methods for modelling 'plate-like' behaviour have been used. The differences in the methods of modelling plates may assume or predict significantly different plate deformation. We describe three methods of modelling plates through: material properties, force balance, and a thin power-law sheet approximation. We compare the results obtained using each method on a series of simple calculations. From these results we are able to develop scaling relations between the different parametrizations. While each method produces different degrees of deformation within the surface plate, the surface heat flux and average plate velocity agree to within a few per cent. The main results are not dependent upon the plate modelling method and therefore are representative of the physical system we set out to model. C1 UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, INST GEOPHYS & PLANETARY PHYS, LA JOLLA, CA 92093 USA. LOS ALAMOS NATL LAB, INST GEOPHYS & PLANETARY PHYS, LOS ALAMOS, NM 87545 USA. HARVARD UNIV, DEPT EARTH & PLANETARY SCI, CAMBRIDGE, MA 02138 USA. JOHNS HOPKINS UNIV, DEPT EARTH & PLANETARY SCI, BALTIMORE, MD 21218 USA. RI King, Scott/B-1220-2008; Gable, Carl/B-4689-2011; OI King, Scott/0000-0002-9564-5164; Gable, Carl/0000-0001-7063-0815 NR 23 TC 70 Z9 70 U1 1 U2 5 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0956-540X EI 1365-246X J9 GEOPHYS J INT JI Geophys. J. Int. PD JUN PY 1992 VL 109 IS 3 BP 481 EP 487 DI 10.1111/j.1365-246X.1992.tb00111.x PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HW932 UT WOS:A1992HW93200001 ER PT J AU HEIKEN, G AF HEIKEN, G TI THERA AND THE AEGEAN WORLD SO GEOTIMES LA English DT Letter RP HEIKEN, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER GEOLOGICAL INST PI ALEXANDRIA PA 4220 KING ST, ALEXANDRIA, VA 22302-1507 SN 0016-8556 J9 GEOTIMES JI Geotimes PD JUN PY 1992 VL 37 IS 6 BP 4 EP 4 PG 1 WC Geosciences, Multidisciplinary SC Geology GA HX329 UT WOS:A1992HX32900002 ER PT J AU CASSEL, CK RUDBERG, MA OLSHANSKY, SJ AF CASSEL, CK RUDBERG, MA OLSHANSKY, SJ TI THE PRICE OF SUCCESS - HEALTH-CARE IN AN AGING SOCIETY SO HEALTH AFFAIRS LA English DT Article ID RESTRICTION AB Americans are growing older, in part as a consequence of dramatic advances in the treatment of acute and chronic illness. Paradoxically, these achievements are making the task of providing health care to every citizen more formidable. Not only does death occur later in life, but the causes of death have shifted dramatically over the course of the twentieth century. While impressive gains have been made in postponing deaths from heart disease, cancer, and stroke, as Christine Cassel and her colleagues point out in this paper, far less progress is evident in preventing, postponing, and treating the nonfatal diseases of old age. Much more emphasis should be placed on controlling disability and chronic disease and providing effective long-term care. Cassel, a member of the Institute of Medicine, National Academy of Sciences, and her colleagues have sought to develop more effective approaches to forecasting future health care needs by combining what they characterize as medical demography with biological factors. Cassel holds a medical degree from the University of Massachusetts. She trained in internal medicine at the University of California, San Francisco, and has completed fellowships in bioethics and geriatrics. Cassel chairs the Section of General Internal Medicine at the University of Chicago and is director of the Center for Health Policy at the university's Harris School of Public Policy Studies. During 1991-1992, she was a Henry J. Kaiser Family Foundation Fellow at the Center for Advanced Study in the Behavioral Sciences in Stanford, California. Mark Rudberg trained in medicine at the Medical College of Wisconsin and holds a master's degree in public health from Boston University. Jay Olshansky has a doctorate in sociology from the University of Chicago and is a scientist at Argonne National Laboratories. He is on the faculty of medicine at the University of Chicago. C1 UNIV CHICAGO,GEN INTERNAL MED SECT,CHICAGO,IL 60637. CTR ADV STUDY BEHAV SCI,STANFORD,CA 94305. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CHICAGO,FAC MED,CHICAGO,IL 60637. RP CASSEL, CK (reprint author), NATL ACAD SCI,INST MED,WASHINGTON,DC 20418, USA. FU NIA NIH HHS [K07 AG06188-02] NR 32 TC 23 Z9 24 U1 0 U2 6 PU PROJECT HOPE-HEALTH AFFAIRS PI SYRACUSE PA PO BOX 8015, SYRACUSE, NY 13217 SN 0278-2715 J9 HEALTH AFFAIR JI Health Aff. PD SUM PY 1992 VL 11 IS 2 BP 87 EP 99 DI 10.1377/hlthaff.11.2.87 PG 13 WC Health Care Sciences & Services; Health Policy & Services SC Health Care Sciences & Services GA JB450 UT WOS:A1992JB45000006 PM 1500063 ER PT J AU FRAME, PW AF FRAME, PW TI NATURAL RADIOACTIVITY IN CURATIVE DEVICES AND SPAS (REPRINTED FROM OAK RIDGER NEWSPAPER, 5 NOVEMBER 1989) SO HEALTH PHYSICS LA English DT Reprint RP FRAME, PW (reprint author), OAK RIDGE ASSOCIATED UNIV, POB 117, OAK RIDGE, TN 37830 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUN PY 1992 VL 62 IS 6 SU S BP S80 EP S82 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HV106 UT WOS:A1992HV10600001 ER PT J AU LENNON, GG LAMERDIN, J LIEUALLEN, K AMEMIYA, C ASLANIDIS, C DEJONG, PJ CARRANO, AV AF LENNON, GG LAMERDIN, J LIEUALLEN, K AMEMIYA, C ASLANIDIS, C DEJONG, PJ CARRANO, AV TI AN STS FROM A CDNA LOCATED IN THE MYOTONIC-DYSTROPHY REGION (DM) ON HUMAN CHROMOSOME-19Q13.3 SO HUMAN MOLECULAR GENETICS LA English DT Article C1 LAWRENCE LIVERMORE NATL LAB, HUMAN GENOME CTR, LIVERMORE, CA 94550 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0964-6906 J9 HUM MOL GENET JI Hum. Mol. Genet. PD JUN PY 1992 VL 1 IS 3 BP 217 EP 217 DI 10.1093/hmg/1.3.217 PG 1 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA JN242 UT WOS:A1992JN24200024 PM 1303190 ER PT J AU ISHIMITSU, T UEHARA, Y NUMABE, A TSUKADA, H OGAWA, Y IWAI, J IKEDA, T MATSUOKA, H SUGIMOTO, T YAGI, S AF ISHIMITSU, T UEHARA, Y NUMABE, A TSUKADA, H OGAWA, Y IWAI, J IKEDA, T MATSUOKA, H SUGIMOTO, T YAGI, S TI INTERFERON-GAMMA ATTENUATES HYPERTENSIVE RENAL INJURY IN SALT-SENSITIVE DAHL RATS SO HYPERTENSION LA English DT Article; Proceedings Paper CT 45TH ANNUAL FALL CONF AND SCIENTIFIC SESSION OF THE COUNCIL FOR HIGH BLOOD PRESSURE RESEARCH CY SEP 24-27, 1991 CL CHICAGO, IL SP COUNCIL HIGH BLOOD PRESSURE RES DE INTERFERON TYPE-II; RENAL FUNCTION; KIDNEY; DAHL RATS; SPONTANEOUSLY HYPERTENSIVE RATS ID INTERLEUKIN-2 AB Evidence has been provided that the immunological mechanism is involved in the genesis or maintenance of hypertension. In the present study, we investigated the effects of interferon gamma, a potent immunomodulator derived from lymphocytes, on hypertension and organ damage in Dahl salt-sensitive rats and in spontaneously hypertensive rats. Subcutaneous injection of interferon gamma (5 x 10(4) units/kg body wt once a week for 10 weeks) reduced blood pressure in Dahl salt-sensitive rats fed a 4% high salt diet (174 versus 194 mm Hg, p<0.025). This blood pressure reduction was associated with an improvement of renal functions, an increase in glomerular filtration rate (690 versus 569 ml/day/100 g body wt, p<0.05), and decreases in urinary protein excretion (48 versus 78 mg/day/100 g body wt, p<0.025) and urinary N-acetyl-beta-D-glucosaminidase excretion (143 versus 183 milliunits/day/100 g body wt, p<0.05). Morphological investigation showed a marked resolution of the vascular injuries seen in untreated Dahl salt-sensitive rats, e.g., intimal and medial hyperplasia, with infiltration of inflammatory cells, and significant amelioration of the glomerular sclerotic changes. In contrast, interferon gamma affected neither blood pressure nor renal functions in spontaneously hypertensive rats. These data indicate that interferon gamma ameliorates the development of hypertension and vascular and renal injuries in Dahl salt-sensitive rats. The resolution of vascular and renal injuries contributes, in part, to the antihypertensive action of interferon gamma. C1 UNIV TOKYO,DEPT MED 2,TOKYO 113,JAPAN. BROOKHAVEN NATL LAB,UPTON,NY 11973. KANTO TEISHIN HOSP,DEPT NEPHROL,TOKYO 141,JAPAN. RP ISHIMITSU, T (reprint author), DOKKYO UNIV,SCH MED,DEPT MED,DIV HYPERTENS & CARDIORENAL DIS,MIBU,TOCHIGI 32102,JAPAN. NR 20 TC 22 Z9 22 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0194-911X J9 HYPERTENSION JI Hypertension PD JUN PY 1992 VL 19 IS 6 BP 804 EP 808 PN 2 PG 5 WC Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA HX023 UT WOS:A1992HX02300042 PM 1592485 ER PT J AU STILLER, L AF STILLER, L TI ENDGAME SOURCE CODE GOES PUBLIC SO ICCA JOURNAL LA English DT Letter C1 LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTL COMPUTER CHESS ASSN UNIV LIMBURG,DEPT COMPUTER SCI PI MAASTRICHT PA FACULTY GENERAL SCIENCES PO BOX 616, 6200 MAASTRICHT, NETHERLANDS SN 0920-234X J9 ICCA J JI ICCA J. PD JUN PY 1992 VL 15 IS 2 BP 107 EP 107 PG 1 WC Computer Science, Software Engineering SC Computer Science GA JE654 UT WOS:A1992JE65400016 ER PT J AU LIU, SH AF LIU, SH TI FORMATION AND ANOMALOUS PROPERTIES OF FRACTALS SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article ID DIFFUSION-LIMITED AGGREGATION; NONINTEGER DIMENSIONS; PERCOLATION CLUSTERS; DENDRITIC GROWTH; SURFACES; CHEMISTRY; INTERFACE; MODEL RP LIU, SH (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 41 TC 8 Z9 10 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD JUN PY 1992 VL 11 IS 2 BP 28 EP 39 DI 10.1109/51.139034 PG 12 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA HV962 UT WOS:A1992HV96200004 ER PT J AU STROBL, K GOLUB, I AF STROBL, K GOLUB, I TI ALL-OPTICAL SWITCHING OF REFLECTIVITY AND TRANSMISSIVITY BY A NONLINEAR SANDWICH SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Letter ID NON-LINEAR INTERFACE; FILM AB We demonstrate a simple model system comprised of a thin nonlinear layer sandwiched between two glass plates. This nonlinear sandwich allows the investigation of both the transmitted and reflected beams for all-optical switching. With a thermal (negative) nonlinearity, high-contrast switching is obtained within several nanoseconds. We also show, for the first time, the avoidance of multiple thresholds and associated beam breakup for a nonsaturating nonlinearity for both the transmitted and reflected beams. This promises cascadability of all-optical devices based on the nonlinear interface. RP STROBL, K (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 19 TC 18 Z9 18 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD JUN PY 1992 VL 28 IS 6 BP 1435 EP 1438 DI 10.1109/3.135294 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HU742 UT WOS:A1992HU74200005 ER PT J AU DARROW, JT ZHANG, XC MORSE, JD AF DARROW, JT ZHANG, XC MORSE, JD TI SATURATION PROPERTIES OF LARGE-APERTURE PHOTOCONDUCTING ANTENNAS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID PULSES; SPECTROSCOPY AB We describe the saturation properties of ultrafast pulsed electromagnetic radiation generated by large-aperture photoconducting antennas as a function of optical excitation fluence. We present a theory that predicts this effect. The amplitude saturation of the radiation has been observed from antennas incorporating GaAs, InP, and radiation damaged silicon-on-sapphire consistent with theoretical expectations. The radiated fields were measured directly with a time resolution of 0.6 ps with the use of a large-aperture antenna as a detector. From these experimental studies, information about the high-speed response (i.e., the transient carrier mobility in the first few picoseconds after optical excitation) of the photoconductors incorporated in the antenna can be obtained under conditions of high applied electric fields and optical fluences. C1 RENSSELAER POLYTECH INST,DEPT PHYS,TROY,NY 12180. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,OPT & ELECTR DEVICES GRP,LIVERMORE,CA 94550. RP DARROW, JT (reprint author), COLUMBIA UNIV,DEPT ELECT ENGN,NEW YORK,NY 10027, USA. RI Zhang, Xi-Cheng/G-1306-2016 OI Zhang, Xi-Cheng/0000-0003-3721-1357 NR 31 TC 168 Z9 182 U1 2 U2 15 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD JUN PY 1992 VL 28 IS 6 BP 1607 EP 1618 DI 10.1109/3.135314 PG 12 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HU742 UT WOS:A1992HU74200025 ER PT J AU Martens, JS Hietala, VM Zipperian, TE Vawter, GA Ginley, DS Tigges, CP AF Martens, J. S. Hietala, Vincent M. Zipperian, Thomas E. Vawter, G. Allen Ginley, D. S. Tigges, Chris P. TI The RF Performance of Long Junction Active Devices Using TlCaBaCuO Step Edge Structures SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article AB The development of nonhysteretic Josephson junctions in high temperature superconducting (HTS) materials again raises the possibility of useful active devices based on flux motion in long junctions. We have made long step edge junctions with TlCaBaCuO with associated control lines that demonstrate strong modulation of critical current, usable current gains, large power gains, and fairly large bandwidths. The devices are operational at up to 95 K and RF measurements have been made at 77 K at frequencies up to a probe-limited 10 GHz. These four terminal devices have output impedances of 2-20 Omega, small signal current gains greater than 2.5, available power gains of over 10dB from 0.5 to 10 GHz and minimum noise figures of <1 dB. C1 [Martens, J. S.; Hietala, Vincent M.; Zipperian, Thomas E.; Vawter, G. Allen; Ginley, D. S.; Tigges, Chris P.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Martens, JS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. FU U.S. Department of Energy [DEAC04-76P00789]; Office of Naval Research FX This work was supported in part by the U.S. Department of Energy under Contract DEAC04-76P00789 and in part by the Office of Naval Research. NR 13 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1051-8223 EI 1558-2515 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD JUN PY 1992 VL 2 IS 2 BP 74 EP 78 DI 10.1109/77.139222 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA V30OA UT WOS:000208824100004 ER PT J AU Martens, JS Hietala, VM Zipperian, TE Kurtz, SR Ginley, DS Tigges, CP Phillips, JM Newman, N AF Martens, J. S. Hietala, V. M. Zipperian, T. E. Kurtz, S. R. Ginley, D. S. Tigges, C. P. Phillips, J. M. Newman, N. TI High Temperature Superconducting Transresistance Amplifiers for Far Infrared Detectors SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article AB Far infrared (IR) focal plane arrays are becoming increasingly important for terrestrial and space-based imaging applications. For noise reasons, it is desirable to have transresistance preamplifiers at the focal plane, and therefore, they need to operate over wide temperature ranges. We have developed high temperature superconducting (HTS) amplifiers that have high gain, relatively low noise, and response times < 200 ps over at least a 10-80 K temperature range. C1 [Martens, J. S.; Hietala, V. M.; Zipperian, T. E.; Kurtz, S. R.; Ginley, D. S.; Tigges, C. P.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Phillips, J. M.] AT&T Bell Labs, Murray Hill, NJ 07974 USA. [Newman, N.] Conductus Inc, Sunnyvale, CA USA. RP Martens, JS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 FU Strategic Defense Initiative; U.S. Department of Energy [DE-AC04-76P00789] FX This work was supported in part by the Strategic Defense Initiative and in part by the U.S. Department of Energy under Contract DE-AC04-76P00789. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1051-8223 EI 1558-2515 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD JUN PY 1992 VL 2 IS 2 BP 111 EP 113 DI 10.1109/77.139228 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA V30OA UT WOS:000208824100010 ER PT J AU PIERRE, DA TRUDNOWSKI, DJ HAUER, JF AF PIERRE, DA TRUDNOWSKI, DJ HAUER, JF TI IDENTIFYING LINEAR REDUCED-ORDER MODELS FOR SYSTEMS WITH ARBITRARY INITIAL CONDITIONS USING PRONY SIGNAL ANALYSIS SO IEEE TRANSACTIONS ON AUTOMATIC CONTROL LA English DT Note ID STABILIZERS; PREDICTION AB Presented in this technical note is a method of identifying reduced-order linear models for systems operating in the neighborhood of an equilibrium point. The method is based on Prony signal analysis which has recently received considerable attention in the study of power system electromechanical oscillations. Prior to the application of the input test signal, the system can be in a transient state. The system input test signal is piecewise continuous and allows several Prony analyses to be performed during aa transient, with each analysis conducted between input discontinuities. Results of these Prony analyses can be combined in various ways to obtain system eigenvalues, transfer-function residues, and initial condition residues. Two examples are given to illustrate the use of the method. C1 PACIFIC NW LAB, DEPT ENERGY SCI, RICHLAND, WA 99352 USA. BONNEVILLE POWER ADM, PORTLAND, OR 97208 USA. RP PIERRE, DA (reprint author), MONTANA STATE UNIV, DEPT ELECT ENGN, BOZEMAN, MT 59717 USA. NR 13 TC 33 Z9 38 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9286 J9 IEEE T AUTOMAT CONTR JI IEEE Trans. Autom. Control PD JUN PY 1992 VL 37 IS 6 BP 831 EP 835 DI 10.1109/9.256344 PG 5 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA HW459 UT WOS:A1992HW45900019 ER PT J AU MOSHER, JC LEWIS, PS LEAHY, RM AF MOSHER, JC LEWIS, PS LEAHY, RM TI MULTIPLE DIPOLE MODELING AND LOCALIZATION FROM SPATIOTEMPORAL MEG DATA SO IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING LA English DT Article ID PRINCIPAL COMPONENT ANALYSIS; EVENT-RELATED POTENTIALS; MAXIMUM-LIKELIHOOD; EVOKED-POTENTIALS; RECONSTRUCTION; MISALLOCATION; LOCATION; VARIANCE AB An array of biomagnetometers may be used to measure the spatio-temporal neuromagnetic field or magnetoencephalogram (MEG) produced by neural activity in the brain. A popular model for the neural activity produced in response to a given sensory stimulus is a set of current dipoles, where each dipole represents the primary current associated with the combined activation of a large numer of neurons located in a small volume of the brain. An important problem in the interpretation of MEG data from evoked response experiments is the localization of these neural current dipoles. We present here a linear algebraic framework for three common spatio-temporal dipole models: i) unconstrained dipoles, ii) dipoles with a fixed location, and iii) dipoles with a fixed orientation and location. In all cases, we assume that the location, orientation, and magnitude of the dipoles are unknown. With a common model, we show how the parameter estimation problem may be decomposed into the estimation of the time invariant parameters using nonlinear least-squares minimization, followed by linear estimation of the associated time varying parameters. A subspace formulation is presented and used to derive a suboptimal least-squares subspace scanning method. The resulting algorithm is a special case of the well-known multiple SIgnal Classification (MUSIC) method, in which the solution (multiple dipole locations) is found by scanning potential locations using a simple one dipole model. Principal components analysis (PCA) dipole fitting has also been used to individually fit single dipoles in a multiple dipole problem. Analysis is presented here to show why PCA dipole fitting will fail in general, whereas the subspace method presented here will generally succeed. Numerically efficient means of calculating the cost functions are presented, and problems of model order selection and missing moments are discussed. Results from a simulation and a somatosensory experiment are presented. C1 LOS ALAMOS NATL LAB,DEPT MECH & ELECTR ENGN,LOS ALAMOS,NM 87544. UNIV SO CALIF,DEPT ELECT ENGN SYST,INST SIGNAL & IMAGE PROC,LOS ANGELES,CA 90089. RP MOSHER, JC (reprint author), TRW CO INC,DIV ENGN & DEV,DEPT ELECTROMAGNET SURVIVABIL,1 SPACE PK,REDONDO BEACH,CA 90278, USA. NR 39 TC 645 Z9 665 U1 4 U2 33 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9294 J9 IEEE T BIO-MED ENG JI IEEE Trans. Biomed. Eng. PD JUN PY 1992 VL 39 IS 6 BP 541 EP 557 DI 10.1109/10.141192 PG 17 WC Engineering, Biomedical SC Engineering GA HW463 UT WOS:A1992HW46300001 PM 1601435 ER PT J AU BOENIG, HJ SCHILLIG, JB KONKEL, HE KLINGNER, PL PETERSEN, TL ROGERS, JD AF BOENIG, HJ SCHILLIG, JB KONKEL, HE KLINGNER, PL PETERSEN, TL ROGERS, JD TI DESIGN, INSTALLATION AND COMMISSIONING OF THE LOS-ALAMOS-NATIONAL-LABORATORY PULSED POWER GENERATOR SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article; Proceedings Paper CT 1992 WINTER MEETING OF THE POWER ENGINEERING SOC OF IEEE CY JAN 26-30, 1991 CL NEW YORK, NY SP IEEE, POWER ENGN SOC AB A 1430 MVA synchronous generator from a cancelled nuclear power plant has been installed and commissioned at Los Alamos National Laboratory (LANL) to provide pulsed power and energy for large physics experiments. This paper describes special studies, tests and design modifications to enable a high-power, steady-state machine to operate as a pulsed, variable-speed generator. The generator rotor and stator core cooling have been changed from hydrogen to air to facilitate the operation. An all solid-state drive system accelerates the generator rotor from standstill to the maximum operating speed of 1800 rpm and from 1260 rpm to 1800 rpm between load pulses. The excitation system has been modified to provide both the motor and generator mode of operation. The generator is mounted on a spring foundation to minimize the transmission of shaft vibrations into the subsoil. The springs also dampen shocks stemming from the pulsed loads. RP BOENIG, HJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 8 TC 4 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD JUN PY 1992 VL 7 IS 2 BP 260 EP 266 DI 10.1109/60.136219 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA HV168 UT WOS:A1992HV16800002 ER PT J AU KALLMAN, JS BERRYMAN, JG AF KALLMAN, JS BERRYMAN, JG TI WEIGHTED LEAST-SQUARES CRITERIA FOR ELECTRICAL-IMPEDANCE TOMOGRAPHY SO IEEE TRANSACTIONS ON MEDICAL IMAGING LA English DT Article ID NONLINEAR TRAVELTIME TOMOGRAPHY; COMPUTED-TOMOGRAPHY; RECONSTRUCTION; ALGORITHM AB Methods are developed for design of electrical impedance tomographic reconstruction algorithms with specified properties. Assuming a starting model with constant conductivity or some other specified background distribution, an algorithm with the following properties is found. 1) The optimum constant for the starting model is determined automatically. 2) The weighted least-squares error between the predicted and measured power dissipation data is as small as possible. 3) The variance of the reconstructed conductivity from the starting model is minimized. 4) Potential distributions with the largest volume integral of gradient squared have the least influence on the reconstructed conductivity, and therefore distributions most likely to be corrupted by contact impedance effects are deemphasized. 5) Cells that dissipate the most power during the current injection tests tend to deviate least from the background value. The resulting algorithm maps the reconstruction problem into a vector space where the contribution to the inversion from the background conductivity remains invariant, while the optimum contributions in orthogonal directions are found. For a starting model with nonconstant conductivity, the reconstruction algorithm has analogous properties. RP KALLMAN, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Berryman, James/A-9712-2008 NR 36 TC 16 Z9 16 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0278-0062 J9 IEEE T MED IMAGING JI IEEE Trans. Med. Imaging PD JUN PY 1992 VL 11 IS 2 BP 284 EP 292 DI 10.1109/42.141653 PG 9 WC Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Engineering, Electrical & Electronic; Imaging Science & Photographic Technology; Radiology, Nuclear Medicine & Medical Imaging SC Computer Science; Engineering; Imaging Science & Photographic Technology; Radiology, Nuclear Medicine & Medical Imaging GA HZ576 UT WOS:A1992HZ57600017 PM 18218383 ER PT J AU BARNES, CE FLEETWOOD, DM SHAW, DC WINOKUR, PS AF BARNES, CE FLEETWOOD, DM SHAW, DC WINOKUR, PS TI POST IRRADIATION EFFECTS (PIE) IN INTEGRATED-CIRCUITS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON RADIATION AND ITS EFFECTS ON DEVICES AND SYSTEMS ( RADECS 91 ) CY SEP 09-12, 1991 CL LA GRANDE MOTTE, FRANCE ID SPACE ENVIRONMENTS; HARDNESS ASSURANCE; MOS DEVICES; RADIATION HARDNESS; DOSE-RATE; X-RAY; CMOS; TRANSISTORS; ELECTRONICS; MECHANISMS AB Post Irradiation Effects (PIE) ranging from normal recovery to catastrophic failure have been observed in integrated circuits during the PIE period. These variations indicate that a rebound or PIE "recipe" used for radiation hardness assurance must be chosen with care. In this paper, we provide examples of PIE in a variety of integrated circuits of importance to spacecraft electronics. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BARNES, CE (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 32 TC 8 Z9 8 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1992 VL 39 IS 3 BP 328 EP 341 DI 10.1109/23.277513 PN 1 PG 14 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JA320 UT WOS:A1992JA32000002 ER PT J AU BENFORD, JN SWEGLE, JA AF BENFORD, JN SWEGLE, JA TI THE 4TH SPECIAL ISSUE ON HIGH-POWER MICROWAVE GENERATION SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Editorial Material C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP BENFORD, JN (reprint author), OLIN CORP,PHYS INT CO,DIV HIGH,POWER MICROWAVE,2700 MERCED ST,SAN LEANDRO,CA, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 109 EP 114 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000001 ER PT J AU FAZIO, MV FREEMAN, BL HOEBERLING, RF KINROSSWRIGHT, J RICKEL, DG STRINGFIELD, RM AF FAZIO, MV FREEMAN, BL HOEBERLING, RF KINROSSWRIGHT, J RICKEL, DG STRINGFIELD, RM TI A MICROSECOND-PULSE-LENGTH, FREQUENCY-STABILIZED VIRTUAL-CATHODE OSCILLATOR USING A RESONANT CAVITY SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID VIRCATOR AB Experiments at the microsecond pulse length have demonstrated that the virtual-cathode oscillator generates narrow-band (0.3% bandwidth) microwave pulses when the virtual cathode is surrounded by a resonant cavity and is driven by an appropriate electron beam. This result is a significant departure from the behavior of a free-running virtual-cathode oscillator where the frequency depends on the (current density)1/2 . This paper describes the long-pulse experimental results. C1 LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV DYNAM TESTING,LOS ALAMOS,NM 87545. NR 11 TC 4 Z9 6 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 305 EP 311 DI 10.1109/27.142832 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000024 ER PT J AU MARDER, BM CLARK, MC BACON, LD HOFFMAN, JM LEMKE, RW COLEMAN, PD AF MARDER, BM CLARK, MC BACON, LD HOFFMAN, JM LEMKE, RW COLEMAN, PD TI THE SPLIT-CAVITY OSCILLATOR - A HIGH-POWER E-BEAM MODULATOR AND MICROWAVE SOURCE SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Review AB This paper describes a compact device, called a split-cavity oscillator, whose self-excited oscillating electromagnetic field converts a large-area steady electron beam into one that is highly density modulated. It does this in a short beam travel length, easing both space-charge and pinching limitations. Thus high currents are possible without requiring a magnetic guide field. Methods for converting the modulated output beam into high-power microwaves are discussed, as are ways to phase-lock several oscillators together. Analytic theory, numerical simulations, and experiments describing the device are presented. C1 SUPERCONDUCTING SUPERCOLLIDER,WAXAHACHIE,TX. USAF,PHILLIPS LAB,ALBUQUERQUE,NM. RP MARDER, BM (reprint author), SANDIA NATL LABS,DIV MICROWAVE PHYS,ALBUQUERQUE,NM 87185, USA. NR 25 TC 51 Z9 63 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 312 EP 331 DI 10.1109/27.142833 PG 20 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000025 ER PT J AU MILLER, RB MCCULLOUGH, WF LANCASTER, KT MUEHLENWEG, CA AF MILLER, RB MCCULLOUGH, WF LANCASTER, KT MUEHLENWEG, CA TI SUPER-RELTRON THEORY AND EXPERIMENTS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB We have developed a highly efficient, high-power microwave tube called Super-Reltron. We have achieved operation at > 400 MW with approximately 50% efficiency at 1 GHz, and 250 MW with 40% efficiency at 3 GHz. The RF pulse durations are typically a few hundred nanoseconds. These compact lightweight tubes do not require an external magnetic field. The RF output coupling is straightforward and delivers the power directly via the fundamental TE10 wave in rectangular waveguide without a mode converter. The key features of our tube include (i) generation of a well-modulated electron beam by periodic virtual cathode formation, (ii) postacceleration of the modulated beam to reduce the relative electron energy spread, and (iii) a multicavity output section that efficiently extracts power without RF breakdown. In this paper, we discuss various theoretical aspects of our device and briefly summarize our experimental results. C1 SANDIA NATL LABS,DIRECTED ENERGY RES DEPT,ALBUQUERQUE,NM 87185. RP MILLER, RB (reprint author), TITAN CORP,DIV SPECTRON,ALBUQUERQUE,NM 87119, USA. NR 8 TC 34 Z9 44 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 332 EP 343 DI 10.1109/27.142834 PG 12 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000026 ER PT J AU RICKEL, DG CARLSTEN, BE FAZIO, MV FAEHL, RJ KWAN, TJT STRINGFIELD, RM WASIERSKI, RF AF RICKEL, DG CARLSTEN, BE FAZIO, MV FAEHL, RJ KWAN, TJT STRINGFIELD, RM WASIERSKI, RF TI DEVELOPMENT OF A LONG-PULSE 1.3 GHZ RELATIVISTIC KLYSTRON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB A research approach is described for obtaining kilojoule microwave pulses of microsecond duration at 1.3 GHz from the relativistic klystron amplifier. Achieving kilojoule microwave pulses requires extending electron beam pulse durations and maximizing the microwave extraction efficiency at the fundamental frequency. An electron beam diode has been constructed that delivers peak currents in excess of 5 kA with a monotonically increasing current pulse exceeding durations of 1-mu-s at beam kinetic energies above 400 keV. Close attention has been given to minimizing the current losses from the diode. Maximum microwave extraction efficiency at the fundamental frequency has been related to the beam bunching amplitude and output cavity shunt impedance in terms of a simple circuit theory. The circuit theory predictions have been tested by particle-in-cell code calculations of the electron beam interactions with the proposed cavity structures. The successful cavity structures have been constructed and are awaiting testing. C1 LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,LOS ALAMOS,NM 87545. RP RICKEL, DG (reprint author), LOS ALAMOS NATL LAB,PULSED MAGNET FIELD FACIL,NATL HIGH MAGNET FIELD LAB,LOS ALAMOS,NM 87545, USA. NR 6 TC 6 Z9 6 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 373 EP 382 DI 10.1109/27.142839 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000031 ER PT J AU CHONG, CK MCDERMOTT, DB RAZEGHI, MM LUHMANN, NC PRETTEREBNER, J WAGNER, D THUMM, M CAPLAN, M KULKE, B AF CHONG, CK MCDERMOTT, DB RAZEGHI, MM LUHMANN, NC PRETTEREBNER, J WAGNER, D THUMM, M CAPLAN, M KULKE, B TI BRAGG REFLECTORS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID DESIGN AB A Bragg reflector composed of periodic cylindrically symmetric corrugations can provide a reflection of nearly unity through the principles of constructive interference, allowing the formation of a frequency selective resonator. Mode conversion will occur, but can be reduced by tapering the amplitude of the corrugations. Reflection measurements are compared with theoretical predictions for untapered sinusoidal and rectangular corrugation as well as a reflector tapered according to the Hamming-window prescription. Measurements of Bragg resonators are also presented. C1 UNIV STUTTGART,INST PLASMA RES,W-7000 STUTTGART 80,GERMANY. UNIV KARLSRUHE,INST HIGH FREQUENCY ELECTR,W-7500 KARLSRUHE,GERMANY. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST TECH PHYS,W-7500 KARLSRUHE 1,GERMANY. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CHONG, CK (reprint author), UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024, USA. RI Razeghi, Manijeh/B-7265-2009 NR 11 TC 71 Z9 79 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 393 EP 402 DI 10.1109/27.142841 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000033 ER PT J AU ANDERSON, KM SEED, TM WILSON, DE HARRIS, JE AF ANDERSON, KM SEED, TM WILSON, DE HARRIS, JE TI 5,8,11,14-EICOSATETRAYNOIC ACID-INDUCED DESTRUCTION OF MITOCHONDRIA IN HUMAN PROSTATE CELLS (PC-3) SO IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL LA English DT Article DE PC-3; PROSTATE; MITOCHONDRIA; ETYA; ULTRASTRUCTURE ID ARACHIDONIC-ACID; DNA-SYNTHESIS; TUMOR-CELLS; METABOLISM; INHIBITORS; RAT AB Culturing human prostate PC-3 cells for 4, 24, or 72 h in the presence of 5,8,11,14-eicosatetraynoic acid (ETYA), an inhibitor of arachidonic acid metabolism and cholesterol biosynthesis, markedly altered the morphology and reduced the number of mitochondria in the treated cells. Using quantitative electron microscopic morphometry, we documented changes in the number, form, area, matrix density, and integrity of the-cristae and limiting membranes of mitochondria in cells cultured with ETYA. The inhibition of cholesterol synthesis or the substitution of ETYA for polyunsaturated fatty acids in the inner membrane may participate in the disruption of the mitochondria, which resembles the morphologic sequelae of oxidative stress. If sufficiently extensive, these changes could contribute to the inhibition of cellular proliferation by ETYA. C1 RUSH MED COLL,DEPT MED,CHICAGO,IL 60612. RUSH MED COLL,DEPT BIOCHEM,CHICAGO,IL 60612. RUSH MED COLL,DEPT NEUROSURG,CHICAGO,IL 60612. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. NR 25 TC 10 Z9 10 U1 0 U2 1 PU SOC IN VITRO BIOLOGY PI COLUMBIA PA 8815 CENTRE PARK DR,STE 210, COLUMBIA, MD 21045 SN 1071-2690 J9 IN VITRO CELL DEV-AN JI In Vitro Cell. Dev. Biol.-Anim. PD JUN PY 1992 VL 28A IS 6 BP 410 EP 414 PG 5 WC Cell Biology; Developmental Biology SC Cell Biology; Developmental Biology GA JE072 UT WOS:A1992JE07200009 PM 1634441 ER PT J AU GAUTESEN, AK AF GAUTESEN, AK TI THE INTERFACE CRACK IN A TENSION FIELD - AN EIGENVALUE PROBLEM FOR THE GAP SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article ID SHEAR FIELD; CONTACT AB The problem of the interface crack in a tension field is reexamined with the objective of obtaining simple and explicit expressions for all quantities of physical interest. The known exact solution to this problem is complicated and difficult to analyze. Here the gap is shown to satisfy an eigenvalue problem. The condition that the gap is nonnegative implies that the smallest eigenvalue is the correct one. A simple uniform approximation for the gap is obtained by using the method of matched asymptotic expansions to take advantage of the smallness of the contact zones. As the tangential shift satisfies the same differential equation as the gap, a uniform approximation for this quantity is obtained by the same method. The tractions are also shown to satisfy a second order ordinary differential equation, and uniform approximations are given for the quantities. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. RP GAUTESEN, AK (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 16 TC 8 Z9 9 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD JUN 1 PY 1992 VL 55 IS 3 BP 261 EP 271 PG 11 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA JA973 UT WOS:A1992JA97300005 ER PT J AU STRIP, D KARASICK, M AF STRIP, D KARASICK, M TI SOLID MODELING ON A MASSIVELY PARALLEL PROCESSOR SO INTERNATIONAL JOURNAL OF SUPERCOMPUTER APPLICATIONS AND HIGH PERFORMANCE COMPUTING LA English DT Article AB Solid modeling underlies many technologies that are key to modern manufacturing. These range from computer-aided design systems to robot simulators, from finite element analysis to integrated circuit process modeling. The accuracy, and hence the utility, of these models is often constrained by the amount of computer time required to perform the desired operations. We present a family of algorithms for solid modeling operations using the Connection Machine, a massively parallel SIMD processor. We describe a data structure for representing solid models and algorithms that use the representation to implement efficiently a variety of solid modeling operations. We give a sketch of the algorithm for intersecting solids and present computational experience using these algorithms. The data structure and algorithms are contrasted with those of serial architectures, and execution times are compared. C1 IBM CORP,DIV RES,TJ WATSON RES CTR,MFG RES DEPT,MODELLING SYST PROJECT,RES STAFF,YORKTOWN HTS,NY. SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185. CORNELL UNIV,DEPT COMP SCI,ROBOT RES PROJECT,ITHACA,NY 14853. RP STRIP, D (reprint author), SANDIA NATL LABS,INTELLIGENT SYST & TECHNOL GRP,DEPT INTELLIGENT SYST PRINCIPLES,ALBUQUERQUE,NM 87185, USA. NR 20 TC 4 Z9 4 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1078-3482 J9 INT J SUPERCOMPUT AP JI Int. J. Supercomput. Appl. High Perform. Comput. PD SUM PY 1992 VL 6 IS 2 BP 175 EP 192 DI 10.1177/109434209200600205 PG 18 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications SC Computer Science GA HY354 UT WOS:A1992HY35400005 ER PT J AU SEIDEL, RW AF SEIDEL, RW TI THE MANHATTAN-PROJECT - A DOCUMENTARY INTRODUCTION TO THE ATOMIC AGE - STOFF,MB, FANTON,JF, WILLIAMS,RH SO ISIS LA English DT Book Review RP SEIDEL, RW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0021-1753 J9 ISIS JI Isis PD JUN PY 1992 VL 83 IS 2 BP 361 EP 361 DI 10.1086/356184 PG 1 WC History & Philosophy Of Science SC History & Philosophy of Science GA HY339 UT WOS:A1992HY33900083 ER PT J AU CANAVAN, GH AF CANAVAN, GH TI DO WE NEED NUCLEAR MISSILES SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter RP CANAVAN, GH (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD SUM PY 1992 VL 8 IS 4 BP 18 EP 19 PG 2 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA JE506 UT WOS:A1992JE50600019 ER PT J AU NAZAROFF, WW DUNG, K GADGIL, AJ AF NAZAROFF, WW DUNG, K GADGIL, AJ TI NUMERICAL INVESTIGATIONS OF THE DEPOSITION OF UNATTACHED PO-218 AND PB-212 FROM NATURAL-CONVECTION ENCLOSURE FLOW SO JOURNAL OF AEROSOL SCIENCE LA English DT Article ID RADON DAUGHTER; RECTANGULAR ENCLOSURES; OZONE; EXPOSURES; REMOVAL; THORON AB We report numerical predictions of the deposition to enclosure surfaces of unattached Po-218 and Pb-212, short-lived decay products of Rn-222 and Rn-220, respectively. The simulations are conducted for square and rectangular two-dimensional enclosures under laminar natural convection flow with Grashof numbers in the range 7 x 10(7) to 8 x 10(10). The predictions are based upon a finite-difference natural-convection fluid-mechanics model that has been extended to simulate the behavior of indoor radon decay products. In the absence of airborne particles. the deposition velocity averaged over the enclosure surface was found to be in the range (2-4) x 10(-4) m s-1 for Po-218 and (1-3) x 10(-4) m s-1 for Pb-212. In each simulation, the deposition rate varied by more than an order of magnitude around the surface of the enclosure with the largest rates occurring near corners. Attachment of decay products to airborne particles increased the deposition velocity; for example, attachment of Po-218 at a rate of 50 h-1 increased the predicted average deposition velocity by 30-70% over values in the absence of attachment. The simulation results have significance for assessing the health risk associated with indoor exposure to Rn-222 and Rn-220 decay products and for investigating the more general problem of the interaction of air pollutants with indoor surfaces. C1 LAWRENCE BERKELEY LAB, DIV ENERGY & ENVIRONM, INDOOR ENVIRONM PROGRAM, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT CIVIL ENGN, BERKELEY, CA 94720 USA. RI Nazaroff, William/C-4106-2008; OI Nazaroff, William/0000-0001-5645-3357; Gadgil, Ashok/0000-0002-0357-9455 NR 35 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-8502 EI 1879-1964 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD JUN PY 1992 VL 23 IS 4 BP 339 EP 352 DI 10.1016/0021-8502(92)90003-E PG 14 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JB811 UT WOS:A1992JB81100003 ER PT J AU CHENG, YS SU, YF NEWTON, GJ YEH, HC AF CHENG, YS SU, YF NEWTON, GJ YEH, HC TI USE OF A GRADED DIFFUSION BATTERY IN MEASURING THE ACTIVITY SIZE DISTRIBUTIONS OF THORON PROGENY SO JOURNAL OF AEROSOL SCIENCE LA English DT Article ID WIRE SCREENS; ULTRAFINE AEROSOLS; RADON; POLONIUM-218; PARTICLES; PB-212; NEUTRALIZATION; COEFFICIENTS; ENVIRONMENT; DEPOSITION AB This paper describes the performance of a graded diffusion battery in measuring the activity size distribution of Pb-212. The diffusion battery consisted of five stainless steel screens with 24,35,50,200 and 635 mesh numbers and a backup filter. Calibration of the screens indicated that the collection of ultrafine particles on these screen follows the diffusion battery theory if the flow rate is kept at a level at which the flow Reynolds number (Re=d(w)U/nu, where d(w) is the wire diameter, U is the face velocity and nu is the kinematic viscosity of air) is less than 1. The activity size distribution of Pb-212 in an aging chamber was measured in ultra-pure air with dry (< 10% r.h.) and humid (40-50% r.h.) conditions. The particle size of Pb-212 (about 1 nm) did not change significantly in the humid air when the mean residence time was between 0.33 and 8.3 min. However, in thc dry air, the thoron progeny grew with aging time from about 1 to 3 nm. By adjusting the relative humidity and the aging time, Pb-212 of activity median diameters from 1 to 3 nm could be produced. This allowed us to study the effect of the particle size of 'unattached' thoron progeny on the deposition efficiency in the upper respiratory tract. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP CHENG, YS (reprint author), INHALAT TOXICOL RES INST, ALBUQUERQUE, NM 87185 USA. NR 33 TC 41 Z9 41 U1 0 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-8502 EI 1879-1964 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD JUN PY 1992 VL 23 IS 4 BP 361 EP 372 DI 10.1016/0021-8502(92)90005-G PG 12 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JB811 UT WOS:A1992JB81100005 ER PT J AU CONRY, MJ HEGARTY, A AF CONRY, MJ HEGARTY, A TI EFFECT OF SOWING DATE AND SEED RATE ON THE GRAIN-YIELD AND PROTEIN-CONTENT OF WINTER BARLEY SO JOURNAL OF AGRICULTURAL SCIENCE LA English DT Article ID NITROGEN-CONTENT AB An experiment, carried out over a 5-year period (1984-88) on medium-heavy textured soil at Athy (Ireland), tested the effect of five sowing dates (early September-early December) and four seed rates (c. 100, 150, 200 and 250 kg/ha) on the grain yield and protein content of winter barley (cv. Panda). September-sown plots gave the greatest yields in all years. Plots sown in mid-October and later gave significantly reduced yields. Yield reductions over the 5-year period averaged 15. 24 and 34% for the mid-October. November and December sowing dates, respectively. Significant differences in yield between the smaller and larger seed rates were obtained, with the latter giving the greatest yields at all sowing dates from late-September to December. Increasing the seed rate. however, did not compensate for the yield reduction due to delayed sowing. In the early September-sown plots. the higher seed rates gave reduced yields in four of the five years (1984-87) with the opposite result in 1988. In 1988 the early September-sown plots gave greater yields than the late September-sown plots. Regression analysis showed a strong relationship between yield and log(ears/m2) in four of the five years (1984-87) but the relationship was poor in 1988 primarily due to the inexplicably low ear population of the early sown plots. The inclusion of 1000-grain weight in the model gave a better fit and accounted for a high proportion (62-80%) of the yield variation. The late September sowing date and the higher seed rates gave slightly lower protein levels in four of the five years. There was an inverse relationship between grain yield and protein for the same four years (1984-87). RP CONRY, MJ (reprint author), OAK PK RES CTR,CARLOW,IRELAND. NR 9 TC 1 Z9 1 U1 2 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0021-8596 J9 J AGR SCI JI J. Agric. Sci. PD JUN PY 1992 VL 118 BP 279 EP 287 PN 3 PG 9 WC Agriculture, Multidisciplinary SC Agriculture GA HY651 UT WOS:A1992HY65100003 ER PT J AU HACKER, BL AF HACKER, BL TI BRODIE,BERNARD AND THE FOUNDATIONS OF AMERICAN NUCLEAR STRATEGY - STEINER,BH SO JOURNAL OF AMERICAN HISTORY LA English DT Book Review RP HACKER, BL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ORGANIZATION AMER HISTORIANS PI BLOOMINGTON PA 112 N BRYAN ST, BLOOMINGTON, IN 47408 SN 0021-8723 J9 J AM HIST JI J. Am. Hist. PD JUN PY 1992 VL 79 IS 1 BP 333 EP 334 DI 10.2307/2078609 PG 2 WC History SC History GA HY817 UT WOS:A1992HY81700143 ER PT J AU CRAIN, JS GALLIMORE, DL AF CRAIN, JS GALLIMORE, DL TI DETERMINATION OF TRACE IMPURITIES IN URANIUM-OXIDES BY LASER ABLATION INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article; Proceedings Paper CT 4TH SURREY CONF ON PLASMA SOURCE MASS SPECTROMETRY / 2ND KINGSTON CONF ON PLASMA SPECTROMETRY IN THE EARTH SCIENCES CY JUL 14-19, 1991 CL GUILDFORD, ENGLAND DE LASER ABLATION INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; TRACE IMPURITY; ACTINIDE AB Laser ablation inductively coupled plasma mass spectrometry was used to perform a semi-quantitative determination of 23 impurity elements in a U3O8 Certified reference material (CRM). Matrix-matched, single-point calibration was achieved by using another CRM from the same series of standards. Based on uncertainties derived from error propagation, most measured concentrations fell within one standard deviation of certified values. Under optimum laser sampling conditions, limits of detection (LODs) for low m/z elements were found to be about 1-mu-g g-1; high m/z elements had LODs approximately 100 times lower. Upper limits of quantification were generally in the low mg g-1 range. Median short-term signal reproducibility was 8% relative standard deviation when an internal reference isotope (U-234) was used. Reproducibility was poorer when the internal reference was not used or when the same area of the target was ablated in replicate. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. NR 15 TC 22 Z9 23 U1 1 U2 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD JUN PY 1992 VL 7 IS 4 BP 605 EP 610 DI 10.1039/ja9920700605 PG 6 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA JJ619 UT WOS:A1992JJ61900009 ER PT J AU SUORTTI, P CHAPMAN, D SCHNEIDER, JR TSCHENTSCHER, T AF SUORTTI, P CHAPMAN, D SCHNEIDER, JR TSCHENTSCHER, T TI BENT-CRYSTAL MONOCHROMATOR FOR 150 KEV SYNCHROTRON RADIATION SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID GROWN SILICON-CRYSTALS; X-RAYS AB The 220 reflectivity curve of a 4 mm thick Si crystal is measured in asymmetric transmission (Laue) geometry. The crystal is bent to a radius varying from 24 to 138 m, and the analyzer is a nearly perfect Si(220) crystal in non-dispersive (+, -) arrangement. The full width at half-maximum of the reflectivity curves varies from 61 to 10-mu-rad, while that of a flat perfect crystal is 1.2-mu-rad, and the observed maximum reflectivity is about 60%. The calculated value is even higher, exceeding 80%. The bent crystal is used as an inverse-Cauchois monochromator, where the source of radiation is on the focusing circle. The effect of the beam divergence on the energy bandpass is eliminated, leaving only the contribution of the reflectivity curve. This can be matched to the desired resolution of the experiment by the choice of the thickness and asymmetry angle of the crystal. Compton-profile measurements from Ag and Au foils are used for a comparison of different monochromators. The bent-crystal monochromator provides 50 times more flux than the perfect Si(220) crystal and a better energy resolution than heat-treated Si(220) or mosaic Ge(220) crystals. C1 BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973. HASYLAB,W-2000 HAMBURG 50,GERMANY. RP SUORTTI, P (reprint author), ESRF,BP 220,F-38043 GRENOBLE,FRANCE. NR 12 TC 8 Z9 8 U1 0 U2 3 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD JUN 1 PY 1992 VL 25 BP 432 EP 438 DI 10.1107/S0021889892000839 PN 3 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA HY826 UT WOS:A1992HY82600015 ER PT J AU FENG, WW AF FENG, WW TI VISCOELASTIC BEHAVIOR OF ELASTOMERIC MEMBRANES SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Article AB The formulation for large deformations of an axisymmetric nonlinear plane viscoelastic membrane is developed. The solutions from the formulation for both creep and relaxation of a circular membrane are presented. An experiment that demonstrates the relaxation phenomenon was performed, and the experimental data are used to determine the constitutive equation of an elastomer. RP FENG, WW (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 6 TC 21 Z9 21 U1 1 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD JUN PY 1992 VL 59 IS 2 BP S29 EP S34 DI 10.1115/1.2899504 PN 2 PG 6 WC Mechanics SC Mechanics GA JA699 UT WOS:A1992JA69900005 ER PT J AU YAMADA, T BUNKER, S MOSS, M AF YAMADA, T BUNKER, S MOSS, M TI NUMERICAL SIMULATIONS OF ATMOSPHERIC TRANSPORT AND DIFFUSION OVER COASTAL COMPLEX TERRAIN SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID TURBULENCE CLOSURE-MODEL AB The purpose of this study was to demonstrate the feasibility of operating the three-dimensional atmospheric models HOTMAC (higher-order turbulence model for atmospheric circulation) and RAPTAD (random puff transport and diffusion) to forecast the transport and dispersion of airborne hazardous materials at Vandenberg Air Force Base, California (VAFB). HOTMAC provides three-dimensional distributions of the mean and turbulence variables to RAPTAD, which simulates transport and diffusion of airborne materials. To test the HOTMAC-RAPTAD model results, data were selected from the Mountain Iron (MI) diffusion experiments that were conducted at VAFB during 1965 and 1966. The data included surface winds, upper-air soundings, and ground-level exposure values of fluorescent particles. Conclusions of this study include: HOTMAC and RAPTAD predictions of the ground-level exposure values were as good as those obtained by diagnostic and empirical models and were the best practical solution where wind data were not available. The HOTMAC and RAPTAD modeling system would be a useful addition to enhance current emergency response management capabilities. C1 USAF, ENGN & SERV CTR, TYNDALL AFB, FL USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. NR 15 TC 26 Z9 27 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD JUN PY 1992 VL 31 IS 6 BP 565 EP 578 DI 10.1175/1520-0450(1992)031<0565:NSOATA>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HV480 UT WOS:A1992HV48000005 ER PT J AU WU, ZC ARAKAWA, ET JIMENEZ, JR SCHOWALTER, LJ AF WU, ZC ARAKAWA, ET JIMENEZ, JR SCHOWALTER, LJ TI OPTICAL-PROPERTIES OF EPITAXIAL COSI2/SI AND COSI2 PARTICLES IN SI FROM 0.062 TO 2.76 EV SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FILMS; SILICON; NISI2 AB We have measured the optical properties of epitaxial CoSi2 films on Si from 0.062 to 2.76 eV by ellipsometry and spectrophotometry. The energy dependencies of the dielectric constants show Drude behavior at energies lower than approximately 0.2 eV with Drude parameters h-omega(p) = (5.8 +/- 0.2) eV and h/tau = (0.09 +/- 0.02) eV. Using the measured optical constants, the CoSi2 film is shown to have maximum absorptance at a thickness of approximately 20 nm for lambda > 1.4-mu-m. Finally, we have calculated the absorptance of a composite film of CoSi2 particles embedded in Si and found that the absorptance peak due to a surface plasmon resonance in the CoSi2 particles shifts to higher energy as the ellipsoidal particles become more elongated, in agreement with recent observations by Fathauer et al. [Phys. Rev. B 44, 1345 (1991)]. C1 RENSSELAER POLYTECH INST,DEPT PHYS,TROY,NY 12181. RENSSELAER POLYTECH INST,CTR INTEGRATED ELECTR,TROY,NY 12181. RENSSELER POLYTECH INST,DEPT PHYS,TROY,NY 12181. RP WU, ZC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 16 TC 19 Z9 19 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 JUN 1 PY 1992 VL 71 IS 11 BP 5601 EP 5605 DI 10.1063/1.350539 PG 5 WC Physics, Applied SC Physics GA HX256 UT WOS:A1992HX25600050 ER PT J AU ASOKAKUMAR, P LEUNG, TC LYNN, KG NIELSEN, B FORCIER, MP WEINBERG, ZA RUBLOFF, GW AF ASOKAKUMAR, P LEUNG, TC LYNN, KG NIELSEN, B FORCIER, MP WEINBERG, ZA RUBLOFF, GW TI POSITRON-ANNIHILATION STUDIES IN THE FIELD-INDUCED DEPLETION REGIONS OF METAL-OXIDE-SEMICONDUCTOR STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MONOENERGETIC POSITRONS; SIO2/SI INTERFACE; MICROVOIDS AB The centroid shifts of positron annihilation spectra are reported from the depletion regions of metal-oxide-semiconductor (MOS) capacitors at room temperature and at 35 K. The centroid shift measurement can be explained using the variation of the electric field strength and depletion layer thickness as a function of the applied gate bias. An estimate for the relevant MOS quantities is obtained by fitting the centroid shift versus beam energy data with a steady-state diffusion-annihilation equation and a derivative-gaussian positron implantation profile. Inadequacy of the present analysis scheme is evident from the derived quantities and alternate methods are required for better predictions. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP ASOKAKUMAR, P (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Nielsen, Bent/B-7353-2009; Rubloff, Gary/D-4142-2009 OI Nielsen, Bent/0000-0001-7016-0040; Rubloff, Gary/0000-0002-1901-3982 NR 15 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1992 VL 71 IS 11 BP 5606 EP 5609 DI 10.1063/1.350540 PG 4 WC Physics, Applied SC Physics GA HX256 UT WOS:A1992HX25600051 ER PT J AU MOONEY, TM ALP, EE YUN, WB AF MOONEY, TM ALP, EE YUN, WB TI MOSSBAUER-FRESNEL ZONE PLATE SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID INCIDENCE ANTIREFLECTION FILMS; NUCLEAR BRAGG-DIFFRACTION; X-RAYS; SYNCHROTRON RADIATION AB We present a novel application of the Fresnel zone plate geometry in which the Mossbauer effect is used to focus nuclear-resonant x-ray photons and thereby to monochromatize synchrotron radiation. The calculated efficiency and energy bandpass of the Mossbauer-Fresnel zone plate monochromator compare well with those of other Mossbauer-effect monochromators currently in use. The unique capability of focusing Mossbauer radiation into a small (few mu-m) spot may have applications in spatially resolved and high-pressure Mossbauer-effect studies. RP MOONEY, TM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 14 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1992 VL 71 IS 11 BP 5709 EP 5711 DI 10.1063/1.350506 PG 3 WC Physics, Applied SC Physics GA HX256 UT WOS:A1992HX25600070 ER PT J AU OU, LC CHEN, J FIORE, E LEITER, JC BRINCKJOHNSEN, T BIRCHARD, GF CLEMONS, G SMITH, RP AF OU, LC CHEN, J FIORE, E LEITER, JC BRINCKJOHNSEN, T BIRCHARD, GF CLEMONS, G SMITH, RP TI VENTILATORY AND HEMATOPOIETIC RESPONSES TO CHRONIC HYPOXIA IN 2 RAT STRAINS SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE CHRONIC MOUNTAIN SICKNESS; HIGH ALTITUDE; VENTILATION; BLOOD GASES; RENAL TISSUE OXYGENATION; PULMONARY GAS EXCHANGE; ERYTHROPOIETIN; MEDULLARY AND SPLENIC ERYTHROPOIESIS; POLYCYTHEMIA; THROMBOCYTOPENIA ID HIGH-ALTITUDE; CARDIOPULMONARY RESPONSES; ERYTHROPOIETIN; BLOOD; PLATELETS; EXPOSURE; EXTRACTS; SERUM; SLEEP AB Hilltop (H) and Madison (M) strains of Sprague-Dawley rats exhibit strikingly different susceptibilities to the effects of chronic altitude exposure. The H rats develop greater polycythemia, hypoxemia, and pulmonary hypertension. We studied ventilation, pulmonary gas exchange, tissue oxygenation, and hematologic adaptations in the two rat strains during a 50-day exposure to a simulated altitude (HA) of 5,500 m (18,000 ft). There were no strain differences among the variables we studied under sea level (SL) conditions. Within the first 14 days of hypoxic exposure, the only significant strain differences were that erythropoietin (EPO) rose much higher and erythroid activity was greater in the H rats, even though arterial PO2 and PCO2 (Pa(O2) and Pa(co2), respectively), renal venous PO2 (Prv(O2)), and ventilation (VE) were equivalent in the two strains during this time. By day 14 at HA, the H rats had significantly higher erythroid activity, hematocrit (Hct), and EPO levels, significantly lower Pa(O2) and Prv(O2), but equivalent VE and Pa(CO2). These changes persisted for the remainder of the exposure, except that the Hct continued to rise and the increase was greater in H rats. Despite the greater O2-carrying capacity of H rats in the later stages of hypoxic exposure, Pa(O2) and Prv(O2) were significantly lower in H rats. There were no strain differences at either SL or HA in ventilatory responses to hypercapnia or hypoxia, in blood O2 affinity or 2,3-diphosphoglycerate, in extrarenal production of EPO, or in EPO clearance. We conclude that early in the hypoxic exposure the H rats produce more EPO at apparently equivalent levels of hypoxia, and this is the first step in the pathogenesis of the maladaptation to HA manifest by H rats. We find no consistent evidence that differences in VE contribute to the variable susceptibility to hypoxia in the two rat strains. C1 DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT MED,HANOVER,NH 03756. DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT PATHOL,HANOVER,NH 03756. DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT PHARMACOL & TOXICOL,HANOVER,NH 03756. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP OU, LC (reprint author), DARTMOUTH COLL,HITCHCOCK MED CTR,DARTMOUTH MED SCH,DEPT PHYSIOL,HANOVER,NH 03756, USA. FU NHLBI NIH HHS [HL-01998, HL-21159] NR 38 TC 28 Z9 28 U1 1 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD JUN PY 1992 VL 72 IS 6 BP 2354 EP 2363 PG 10 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA HZ317 UT WOS:A1992HZ31700044 PM 1629091 ER PT J AU TUNG, CS AF TUNG, CS TI A REDUCED SET OF COORDINATES FOR MODELING DNA STRUCTURES .1. A B-TO-A TRANSITION PATHWAY DRIVEN BY PSEUDOROTATIONAL ANGLE SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID STATISTICAL-MECHANICAL PROCEDURE; NATIVE CONFORMATION; BACKBONE STRUCTURE; FURANOSE RING; NUCLEIC-ACIDS; FORCE-FIELD; POLYMORPHISM; POLYPEPTIDE; PREDICTION; ENKEPHALIN AB The A-DNA and the B-DNA are two well characterized polymorphous forms of DNA duplex. By using Metropolis Monte Carlo Simulations in a reduced coordinate space, we have shown that the B double-line arrow pointing left and right A transitions can be induced by forcing pseudorotational angle (W) to change between C3'-endo and C2'-endo puckerings. The energy barrier for the transition pathway is less than 10 Kcal . mol-1. Base-pair parameters x-displacement (D(x)) and roll (rho), which have the largest differences between the two forms of structures, cannot drive the transition. Our results support the view that the bistable states of the DNA duplex are due to the bistable structures of the sugar ring. RP TUNG, CS (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 22 TC 10 Z9 10 U1 0 U2 0 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD JUN PY 1992 VL 9 IS 6 BP 1185 EP 1194 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JC180 UT WOS:A1992JC18000010 PM 1637508 ER PT J AU KATONA, T GUCZI, L SOMORJAI, GA AF KATONA, T GUCZI, L SOMORJAI, GA TI THE REDUCTION OF NITRIC-OXIDE BY AMMONIA OVER POLYCRYSTALLINE PLATINUM MODEL CATALYSTS IN THE PRESENCE OF OXYGEN SO JOURNAL OF CATALYSIS LA English DT Article ID SINGLE-CRYSTAL SURFACE; DEACTIVATED CATALYSTS; SO2 DEACTIVATION; NO REDUCTION; NH3; OXIDATION; AUGER; RH C1 JOZSEF A UNIV,DEPT ORGAN CHEM,H-6720 SZEGED,HUNGARY. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. HUNGARIAN ACAD SCI,INST ISOTOPES,H-1525 BUDAPEST,HUNGARY. RP KATONA, T (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT & CHEM SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 18 TC 16 Z9 16 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD JUN PY 1992 VL 135 IS 2 BP 434 EP 443 DI 10.1016/0021-9517(92)90045-J PG 10 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA HW963 UT WOS:A1992HW96300009 ER PT J AU HAMAGUCHI, JR TOBEY, RA PINES, J CRISSMAN, HA HUNTER, T BRADBURY, EM AF HAMAGUCHI, JR TOBEY, RA PINES, J CRISSMAN, HA HUNTER, T BRADBURY, EM TI REQUIREMENT FOR P34(CDC2) KINASE IS RESTRICTED TO MITOSIS IN THE MAMMALIAN CDC2 MUTANT FT210 SO JOURNAL OF CELL BIOLOGY LA English DT Article ID CELL-CYCLE CONTROL; MATURATION-PROMOTING FACTOR; HISTONE H-1 KINASE; YEAST SCHIZOSACCHAROMYCES-POMBE; LYSINE-RICH HISTONE; FISSION YEAST; PROTEIN-KINASE; M-PHASE; SACCHAROMYCES-CEREVISIAE; MESSENGER-RNA AB The mouse FT210 cell line is a temperature-sensitive cdc2 mutant. FT210 cells are found to arrest specifically in G2 phase and unlike many alleles of cdc2 and cdc28 mutants of yeasts, loss of p34cdc2 at the nonpermissive temperature has no apparent effect on cell cycle progression through the G1 and S phases of the division cycle. FT210 cells and the parent wild-type FM3A cell line each possess at least three distinct histone H1 kinases. H1 kinase activities in chromatography fractions were identified using a synthetic peptide substrate containing the consensus phosphorylation site of histone H1 and the kinase subunit compositions were determined immunochemically with antisera prepared against the "PSTAIR" peptide, the COOH-terminus of mammalian p34cdc2 and the human cyclins A and B1. The results show that p34cdc2 forms two separate complexes with cyclin A and with cyclin B1, both of which exhibit thermal lability at the nonpermissive temperature in vitro and in vivo. A third H1 kinase with stable activity at the nonpermissive temperature is comprised of cyclin A and a cdc2-like 34-kD subunit, which is immunoreactive with anti-"PSTAIR" antiserum but is not recognized with anti-serum specific for the COOH-terminus of p34cdc2 . The cyclin A-associated kinases are active during S and G2 phases and earlier in the division cycle than the p34cdc2-cyclin B1 kinase. We show that mouse cells possess at least two cdc2-related gene products which form cell cycle regulated histone H1 kinases and we propose that the murine homolog of yeast p34cdc/CDC28 is essential only during the G2-to-M transition in FT210 cells. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. SALK INST BIOL STUDIES,MOLEC BIOL & VIROL LAB,SAN DIEGO,CA 92186. OI Pines, Jonathon/0000-0002-5227-6004 NR 93 TC 70 Z9 70 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0021-9525 J9 J CELL BIOL JI J. Cell Biol. PD JUN PY 1992 VL 117 IS 5 BP 1041 EP 1053 DI 10.1083/jcb.117.5.1041 PG 13 WC Cell Biology SC Cell Biology GA HV350 UT WOS:A1992HV35000011 PM 1533642 ER PT J AU TRUONG, TN MCCAMMON, JA KOURI, DJ HOFFMAN, DK AF TRUONG, TN MCCAMMON, JA KOURI, DJ HOFFMAN, DK TI A COMBINED QUANTUM-CLASSICAL DYNAMICS METHOD FOR CALCULATING THERMAL RATE CONSTANTS OF CHEMICAL-REACTIONS IN SOLUTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STOCHASTIC BOUNDARY-CONDITIONS; PROTON-TRANSFER REACTIONS; TIME-DEPENDENT TREATMENT; INTEGRAL CROSS-SECTIONS; MOLECULAR-DYNAMICS; SCATTERING; MECHANICS; ENZYMES AB We present a combined quantum-classical-stochastic dynamics method based on the flux-flux correlation function for calculating the thermal rate constants of chemical reactions in solution or in biological systems. The present method is an extension of an earlier method by Metiu and co-workers [J. Chem. Phys. 88, 2478 (1988)] to include stochastic dynamics. The method is tested by applying it to a simple model of hydrogen atom transfer reaction in solution. We also examine the behavior of the flux-flux correlation function and the rate constants as functions of viscosity. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. UNIV HOUSTON, DEPT PHYS, HOUSTON, TX 77204 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. RP UNIV HOUSTON, DEPT CHEM, HOUSTON, TX 77204 USA. NR 39 TC 27 Z9 27 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1992 VL 96 IS 11 BP 8136 EP 8142 DI 10.1063/1.462316 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HW836 UT WOS:A1992HW83600028 ER PT J AU KLIPPENSTEIN, SJ KRESS, JD AF KLIPPENSTEIN, SJ KRESS, JD TI COMPARISON OF VARIATIONAL RICE-RAMSPERGER-KASSEL-MARCUS THEORY WITH QUANTUM SCATTERING-THEORY FOR THE HE+H-2+-]HEH(+)+H REACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FLEXIBLE TRANSITION-STATES; CLASSICAL MECHANICAL THEORY; PHOTODETACHMENT SPECTRUM; REACTION PROBABILITIES; COLLINEAR REACTIONS; CHEMICAL-REACTIONS; SINGLET THRESHOLD; HEH2+ SYSTEMS; DISSOCIATION; PHOTOFRAGMENTATION AB Three-dimensional quantum-scattering-theory calculations of the cumulative reaction probability (CRP) for the He + H2+ --> HeH+ + H reaction are reported for total angular momentum J = 0. The results of these calculations are compared with variational calculations of the number of available states at the transition state for the dissociation of HeH2+ into HeH+ and H. For this reaction at zero total angular momentum two separate transition-state regions are found to exist throughout a broad energy range. The long-range transition state is found to be dominant for total energies up to at least 1.5 eV. As a result the energy spacings of the steps observed in the averaged CRP roughly correlate with the product rotational energy spacings. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP KLIPPENSTEIN, SJ (reprint author), CASE WESTERN RESERVE UNIV,DEPT CHEM,CLEVELAND,OH 44106, USA. OI Klippenstein, Stephen/0000-0001-6297-9187 NR 54 TC 31 Z9 31 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1992 VL 96 IS 11 BP 8164 EP 8170 DI 10.1063/1.462320 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HW836 UT WOS:A1992HW83600032 ER PT J AU PARKS, EK WINTER, BJ KLOTS, TD RILEY, SJ AF PARKS, EK WINTER, BJ KLOTS, TD RILEY, SJ TI EVIDENCE FOR POLYICOSAHEDRAL STRUCTURE IN AMMONIATED IRON, COBALT, AND NICKEL CLUSTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IONIZATION-POTENTIALS; CHEMICAL PROBES; ARGON CLUSTERS; PHOTOIONIZATION; HYDROGEN AB Experimental evidence is presented that small (19- to 34-atom) clusters of iron, cobalt, and nickel tend to adopt polyicosahedral structure when saturated with ammonia. Clusters in the polyicosahedral series (having 19, 23, 26, 29, 32, and 34 atoms) often saturate with 12 NH3 molecules, the expected number for polyicosahedral structure. Other clusters in this size range, which do not have an obvious number of NH3 binding sites, generally do not show a clear saturation. Adsorbate-induced structural changes are also seen, and suggest that for larger clusters in the series there is a transformation to an alternate structure that binds more than 12 NH3 molecules. RP ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RI Winter, Bernd/D-4657-2011 NR 16 TC 69 Z9 69 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1992 VL 96 IS 11 BP 8267 EP 8274 DI 10.1063/1.462330 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HW836 UT WOS:A1992HW83600043 ER PT J AU LI, Y HONIGMANN, M BHANUPRAKASH, K HIRSCH, G BUENKER, RJ DILLON, MA KIMURA, M AF LI, Y HONIGMANN, M BHANUPRAKASH, K HIRSCH, G BUENKER, RJ DILLON, MA KIMURA, M TI COUPLED DIABATIC CONFIGURATION-INTERACTION TREATMENT OF THE O2 B'-X TRANSITION INCLUDING COMPUTATION OF PREDISSOCIATION LINEWIDTHS, OPTICAL F-VALUES, AND GENERALIZED OSCILLATOR-STRENGTHS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CI CALCULATIONS; ENERGY EXTRAPOLATION; ELECTRONIC-SPECTRUM; MOLECULAR-OXYGEN; RYDBERG STATES; AB-INITIO; ABINITIO; VALENCE; O-2; REPRESENTATION AB Ab initio CI (configuration interaction) calculations are carried out for O2 in various (3)SIGMA(U)- excited states in order to study the avoided crossing that is responsible for the discrete B'-X bands found in the high-energy region of the Schumann-Runge continuum. A diabatic transformation is carried out which allows for the description of nonadiabatic effects in this spectral range. A coupled vibrational treatment is employed in conjunction with the complex scaling technique in order to compute the predissociation linewidths of the B' levels, and these results are found to be in good agreement with experiment, particularly for trends observed between different isotopomers of this system. Optical f values and generalized oscillator strengths (GOS) are calculated for a series of vibrational transitions and are also found to compare well with measured data. The observed finding that the GOS varies quite slowly with K2 for the 0-0 transition, but decreases rather sharply for the 1-0 species is reproduced in the calculations and the behavior of this property for other transitions is predicted. C1 ARGONNE NATL LAB,DIV ENVIRONM PHYS,ARGONNE,IL 60439. RP LI, Y (reprint author), BERG UNIV GESAMTHHSCH WUPPERTA,FACHBEREICH THEORET CHEM 9,GAUSSSTR 20,W-5600 WUPPERTAL 1,GERMANY. NR 40 TC 37 Z9 38 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1992 VL 96 IS 11 BP 8314 EP 8322 DI 10.1063/1.462335 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HW836 UT WOS:A1992HW83600048 ER PT J AU MATSUDA, Y SMITH, GR AF MATSUDA, Y SMITH, GR TI A MICROINSTABILITY CODE FOR A UNIFORM MAGNETIZED PLASMA WITH AN ARBITRARY DISTRIBUTION FUNCTION SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID CYCLOTRON MASER INSTABILITY; KILOMETRIC RADIATION; PROPAGATION C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 22 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUN PY 1992 VL 100 IS 2 BP 229 EP 235 DI 10.1016/0021-9991(92)90230-V PG 7 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JB297 UT WOS:A1992JB29700002 ER PT J AU SHARAFEDDIN, OA BOWEN, HF KOURI, DJ HOFFMAN, DK AF SHARAFEDDIN, OA BOWEN, HF KOURI, DJ HOFFMAN, DK TI NUMERICAL EVALUATION OF SPHERICAL BESSEL TRANSFORMS VIA FAST FOURIER-TRANSFORMS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID TIME-DEPENDENT TREATMENT; EQUATION; SCATTERING 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 SHARAFEDDIN, OA (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 9 TC 12 Z9 12 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUN PY 1992 VL 100 IS 2 BP 294 EP 296 DI 10.1016/0021-9991(92)90236-R PG 3 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JB297 UT WOS:A1992JB29700008 ER PT J AU BRACKBILL, JU KOTHE, DB ZEMACH, C AF BRACKBILL, JU KOTHE, DB ZEMACH, C TI A CONTINUUM METHOD FOR MODELING SURFACE-TENSION SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FLUID-FLOWS; DYNAMICS RP BRACKBILL, JU (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 34 TC 2839 Z9 3042 U1 39 U2 264 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUN PY 1992 VL 100 IS 2 BP 335 EP 354 DI 10.1016/0021-9991(92)90240-Y PG 20 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JB297 UT WOS:A1992JB29700012 ER PT J AU NUNEZ, L ROGERS, RD AF NUNEZ, L ROGERS, RD TI CRYSTAL-STRUCTURE OF [PRCL3(15-CROWN-5)] PREPARED VIA ELECTROCRYSTALLIZATION SO JOURNAL OF CRYSTALLOGRAPHIC AND SPECTROSCOPIC RESEARCH LA English DT Article ID CROWN-ETHER COMPLEXES; LANTHANIDE CHLORIDE COMPLEXES; 15-CROWN-5; CHEMISTRY; CL3.(15-CROWN-5); CRYSTALLIZATION; 12-CROWN-4 AB [PrCl3(15-crown-5)] was synthesized by electrocrystallization using a 1 : 1 metal to crown molar ratio. The complex crystallizes in the centric P2(1)/c space group with a = 8.191(4) angstrom, b = 14.245(9) angstrom, c = 14.226(6) angstrom, beta = 104.69(6)-degrees, and D(calc) = 1.93 g/cm3 for Z = 4 (20-degrees-C). A final R value of 0.070 was obtained via least-squares refinement using 2356 independent observed [F(o) greater-than-or-equal-to 5sigma(F(o))] reflections. The Pr ion is eight-coordinate with three chloride ions and the five oxygens of the crown ether directly coordinated. C1 NO ILLINOIS UNIV,DEPT CHEM,DE KALB,IL 60115. RP NUNEZ, L (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. RI Rogers, Robin/C-8265-2013 OI Rogers, Robin/0000-0001-9843-7494 NR 15 TC 11 Z9 11 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0277-8068 J9 J CRYST SPECTROSC PD JUN PY 1992 VL 22 IS 3 BP 265 EP 269 DI 10.1007/BF01199527 PG 5 WC Crystallography; Spectroscopy SC Crystallography; Spectroscopy GA JQ118 UT WOS:A1992JQ11800003 ER PT J AU MEI, Z MORRIS, JW AF MEI, Z MORRIS, JW TI CHARACTERIZATION OF EUTECTIC SN-BI SOLDER JOINTS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE LOW TEMPERATURE SOLDERS; BISMUTH-TIN SOLDER AB This report presents experimental results on 58Bi-42Sn solder joints, optical and SEM microstructures of their matrix and of their interface with copper, solidification behavior studied by differential scanning calorimetry, wettability to copper, creep, and low cycle fatigue. These results are discussed in comparison with 60Sn-40Pb solder, and with three low temperature solders, 52In-48Sn, 43Sn-43Pb-14Bi, and 40In-40Sn-20Pb. The 58Bi-42Sn solder paste with RMA flux wets Cu matrix with a wetting angle of 35-degrees and had a 15-degrees-C undercooling during solidification. The constitutive equation of the steady state shear strain rate, and the Coffin-Manson relation constants for the low cycle shear fatigue life at 65-degrees-C have been determined. The test results show that this solder has the best creep resistance but the poorest fatigue strength compared with the other four solders. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP MEI, Z (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 26 TC 166 Z9 167 U1 4 U2 32 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUN PY 1992 VL 21 IS 6 BP 599 EP 607 DI 10.1007/BF02655427 PG 9 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA HZ504 UT WOS:A1992HZ50400007 ER PT J AU FREER, JL MORRIS, JW AF FREER, JL MORRIS, JW TI MICROSTRUCTURE AND CREEP OF EUTECTIC INDIUM TIN ON COPPER AND NICKEL SUBSTRATES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE IN-SN; CREEP; EUTECTIC MICROSTRUCTURE AB The behavior during creep in shear of eutectic indium-tin joints on copper and nickel substrates was examined in order to determine the effect of creep deformation on the microstructure of the alloy. Primary creep was absent in all the samples tested. The stress exponent at 20-degrees-C was much higher for samples on nickel than for those on copper, indicating a different creep deformation mechanism. Also, the microstructure within the indium-tin joints differed significantly with a change of substrate. Samples with a nickel substrate showed a colony microstructure that was not observed in those with a copper substrate. Thus, eutectic morphology is important in determining deformation mechanism during creep. The microstructure within the joints in tested and untested regions of the samples was effectively the same. This is quite distinct from the behavior of eutectic lead-tin observed in previous work. Lead-tin formed a recrystallized band of material along a region of concentrated shear deformation. While the deformation pattern in the indium-tin samples appeared to be the same as for lead-tin, the microstructural changes did not occur. This implies that the behavior observed in lead-tin is not universal to eutectic alloys. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP FREER, JL (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 8 TC 42 Z9 42 U1 2 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUN PY 1992 VL 21 IS 6 BP 647 EP 652 DI 10.1007/BF02655434 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA HZ504 UT WOS:A1992HZ50400014 ER PT J AU LONG, RC MITCHELL, BJ AF LONG, RC MITCHELL, BJ TI A NEW APPROACH TO DIRECTIONAL SURVEY INTERPRETATION AND COURSE CORRECTION BY THE SECTIONAL METHOD SO JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB An oblique circular arc representation for wellbore trajecories, a geometric analysis termed the sectional method, is presented. This approach permits projected line segments to be functions of the dogleg angle and to be related to usually measured displacements between survey stations. The advantages of this analysis are: a solution for the dogleg angle and a method of survey interpretation, the sectional method; a procedure for exact interpolation of true vertical depth, azimuth, and inclination between survey stations; a basis of solution for a computer program which provides course correction information during a turn to a target. The program provides a solution summary for a course correction from various survey stations in a well to any planned target. As a result, an optimum course correction or "minimum plugback depth" can be quickly determined. Once the desired kickoff point is selected, the program provides an exact solution of true vertical depth, azimuth, inclination, and toolface angle for every 100 of correction course length. The latter result provides a dramatic improvement in existing technology because all measurements used to control the correction run are now based on a center of turn rather than the arbitrary reference used in the typical ouija board solution; and because the solution is exact, such variables as effective toolface angle can better be evaluated and precisely corrected resulting in the smoothest possible turn with minimum doglegs. RP LONG, RC (reprint author), US DOE,CHARACTERIZAT PROJECT OFF,YUCCA MT SITE,LAS VEGAS,NV 89103, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0195-0738 J9 J ENERG RESOUR-ASME JI J. Energy Resour. Technol.-Trans. ASME PD JUN PY 1992 VL 114 IS 2 BP 163 EP 174 DI 10.1115/1.2905937 PG 12 WC Energy & Fuels SC Energy & Fuels GA HZ822 UT WOS:A1992HZ82200010 ER PT J AU BERCOVICI, D SCHUBERT, G GLATZMAIER, GA AF BERCOVICI, D SCHUBERT, G GLATZMAIER, GA TI 3-DIMENSIONAL CONVECTION OF AN INFINITE-PRANDTL-NUMBER COMPRESSIBLE FLUID IN A BASALLY HEATED SPHERICAL-SHELL SO JOURNAL OF FLUID MECHANICS LA English DT Article ID LARGE-SCALE STRUCTURE; THERMAL-CONVECTION; EARTHS MANTLE; NUMERICAL SIMULATIONS; TERRESTRIAL PLANETS; PLATE MOTIONS; MODEL; HETEROGENEITY; TOPOGRAPHY; EVOLUTION AB A numerical investigation is made of the effects of compressibility on three-dimensional thermal convection in a basally heated, highly viscous fluid spherical shell with an inner to outer radius ratio of approximately 0.55, characteristic of the Earth's whole mantle. Compressibility is implemented with the anelastic approximation and a hydrostatic adiabatic reference state whose bulk modulus is a linear function of pressure. The compressibilities studied range from Boussinesq cases to compressibilities typical of the Earth's whole mantle. Compressibility has little effect on the spatial structure of steady convection when the superadiabatic temperature drop across the shell DELTA-T(sa) is comparable to a characteristic adiabatic temperature. When DELTA-T(sa) is approximately an order of magnitude smaller than the adiabatic temperature, compressibility is significant. For all the non-Boussinesq cases, the regular polyhedral convective patterns that exist at large DELTA-T(sa) break down at small DELTA-T(sa) into highly irregular patterns; as DELTA-T(sa) decreases convection becomes penetrative in the upper portion of the shell and is strongly time dependent at Rayleigh numbers only ten times the critical Rayleigh number, [Ra]cr. Viscous heating in the compressible solutions is concentrated around the upwelling plumes and is greatest near the top and bottom of the shell. Solutions with regular patterns (and large DELTA-T(sa)) remain steady up to fairly high Rayleigh numbers (100[Ra]cr), while solutions with irregular convective patterns are time dependent at similar Rayleigh numbers. Compressibility, affects the pattern evolution of the irregular solutions, producing fewer upwelling plumes with increasing compressibility. C1 UNIV CALIF LOS ANGELES, DEPT EARTH & SPACE SCI, LOS ANGELES, CA 90024 USA. LOS ALAMOS NATL LAB, DIV EARTH & ENVIRONM SCI, LOS ALAMOS, NM 87545 USA. RP UNIV HAWAII, SCH OCEAN & EARTH SCI & TECHNOL, DEPT GEOL & GEOPHYS, HONOLULU, HI 96822 USA. RI Bercovici, David/B-1676-2008 NR 66 TC 49 Z9 49 U1 0 U2 8 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD JUN PY 1992 VL 239 BP 683 EP 719 DI 10.1017/S0022112092004580 PG 37 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JB432 UT WOS:A1992JB43200030 ER PT J AU NUCKOLLS, JH AF NUCKOLLS, JH TI FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP NUCKOLLS, JH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 57 EP 58 DI 10.1007/BF01080163 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000002 ER PT J AU GLASS, AJ AF GLASS, AJ TI STATUS AND PLANS FOR ITER SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP GLASS, AJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-7,LIVERMORE,CA 94551, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 59 EP 62 DI 10.1007/BF01080164 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000003 ER PT J AU SHEFFIELD, J AF SHEFFIELD, J TI FUTURE-DIRECTIONS IN MAGNETIC FUSION SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP SHEFFIELD, J (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,POB 2009,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 67 EP 67 DI 10.1007/BF01080166 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000005 ER PT J AU COOK, DL AF COOK, DL TI FUTURE-DIRECTIONS IN PULSED POWER DRIVEN ICF SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP COOK, DL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 69 EP 71 DI 10.1007/BF01080167 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000006 ER PT J AU YOUNGER, SM AF YOUNGER, SM TI INERTIAL CONFINEMENT FUSION AT LOS-ALAMOS SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP YOUNGER, SM (reprint author), LOS ALAMOS NATL LAB,INERTIAL CONFINEMENT FUS PROGR,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 75 EP 77 DI 10.1007/BF01080169 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000008 ER PT J AU GLASS, AJ AF GLASS, AJ TI OPPORTUNITIES FOR UNITED-STATES INDUSTRY IN THE ITER PROJECT SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP GLASS, AJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-7,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD JUN PY 1992 VL 11 IS 2 BP 99 EP 102 DI 10.1007/BF01080172 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000011 ER PT J AU SONG, P RUSSELL, CT THOMSEN, MF AF SONG, P RUSSELL, CT THOMSEN, MF TI SLOW MODE TRANSITION IN THE FRONTSIDE MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID DAYSIDE MAGNETOPAUSE; PLASMA; SOLAR; DEPLETION; WAVES; SHOCK AB Three magnetosheath passes with density enhancements in front of the magnetopause are studied with data from ISEE 1,2, and 3. The density structure appears to be locally generated and slow mode in nature. In one pass when ISEE 1 and 2 were well separated, the motion of the density structure can be determined. The density structure appears to stand in the magnetosheath flow. Thus it propagates upstream in the rest frame of the flow. The flow in and near the density structure appears to be closer to isothermal than adiabatic. The flow velocity decreases from super-slow to being close to the intermediate and slow mode velocities at the outer edge of the density structure. This study provides additional evidence that the density structure in front of the magnetopause is a slow mode transition in which the flow velocity decreases to the MHD slow mode velocity. The slow mode transition may consist of two waves fronts and a region with strong slow mode waves. This slow mode transition may play an important role in establishing the flow and field pattern near the magnetopause. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OI Russell, Christopher/0000-0003-1639-8298 NR 26 TC 136 Z9 136 U1 2 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1992 VL 97 IS A6 BP 8295 EP 8305 DI 10.1029/92JA00381 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HX984 UT WOS:A1992HX98400017 ER PT J AU GARY, SP AF GARY, SP TI THE MIRROR AND ION-CYCLOTRON ANISOTROPY INSTABILITIES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID QUASI-PERPENDICULAR SHOCK; EARTHS BOW SHOCK; COLLISIONLESS SHOCKS; SOLAR-WIND; WAVES; MAGNETOSHEATH; TURBULENCE; DOWNSTREAM; BETA; MAGNETOSPHERE AB The linear dispersion equation for fully electromagnetic waves and instabilities at arbitrary directions of propagation relative to a background magnetic field B(o) in a homogeneous Vlasov plasma is solved numerically for bi-Maxwellian particle distribution. For isotropic plasmas the dispersion and damping of the three modes below the proton cyclotron frequency are studied as functions of beta(i) and T(e)/T(i). The transport ratios of helicity, cross-helicity, Alfven ratio, compressibility, and parallel compressibility are defined. Under the condition that the proton temperature perpendicular to B(o) is greater than the parallel temperature, the growth rates and transport ratios of the mirror instability and the ion cyclotron anisotropy instability are examined and compared. Both the proton parallel compressibility and the proton Alfven ratio are significantly different for the two growing modes. RP GARY, SP (reprint author), LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 40 TC 135 Z9 135 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1992 VL 97 IS A6 BP 8519 EP 8529 DI 10.1029/92JA00299 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HX984 UT WOS:A1992HX98400032 ER PT J AU VAN DE WALLE, CG LAKS, DB AF VAN DE WALLE, CG LAKS, DB TI THEORY OF DEFECTS, IMPURITIES, AND DOPING IN ZNSE SO JOURNAL OF LUMINESCENCE LA English DT Article ID P-TYPE ZNSE; SELF-COMPENSATION; SEMICONDUCTORS; CENTERS; PHOSPHORUS; RESONANCE AB The formation of native defects and incorporation of dopant impurities in ZnSe are addressed from a first-principles point of view. Our calculations of the atomic and electronic structure yield explicit microscopic information about atomic positions, relaxation and bonding. Hyperfine parameters are computed, which can be directly compared with experimental data. Our formalism also produces concentrations of the various defects and impurities. One of our major findings is that native defects are not responsible for the doping difficulties in ZnSe. Investigations of Li, a potential p-type dopant, indicate that the achievable hole concentration is restricted in this case by the limited stability and solubility of Li on the substitutional acceptor site. C1 NORTH AMER PHILIPS CORP, PHILIPS LABS, BRIARCLIFF MANOR, NY 10510 USA. NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Van de Walle, Chris/A-6623-2012 OI Van de Walle, Chris/0000-0002-4212-5990 NR 23 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 EI 1872-7883 J9 J LUMIN JI J. Lumines. PD JUN PY 1992 VL 52 IS 1-4 BP 1 EP 8 DI 10.1016/0022-2313(92)90229-3 PG 8 WC Optics SC Optics GA HY320 UT WOS:A1992HY32000002 ER PT J AU MCMICHAEL, RD SHULL, RD SWARTZENDRUBER, LJ BENNETT, LH WATSON, RE AF MCMICHAEL, RD SHULL, RD SWARTZENDRUBER, LJ BENNETT, LH WATSON, RE TI MAGNETOCALORIC EFFECT IN SUPERPARAMAGNETS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID MAGNETIC REFRIGERATION; ROOM-TEMPERATURE AB The magnetocaloric effect is calculated for superparamagnetic materials as a function of temperature, field and cluster size. Assuming classical behavior, a universal curve is calculated from which an optimum cluster moment may be found for maximum entropy change upon application of a given field H at a given temperature T. Quantum effects are shown to be small for temperatures above 10 K and fields less than a few tesla. A comparison with results for a spin-7/2 paramagnet such as Gd3Ga5O12 (GGG) is made, which indicates that superparamagnetic materials such as magnetic nanocomposites offer the possibility of extending the upper useful temperature limit of paramagnetic materials for magnetic refrigeration. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP MCMICHAEL, RD (reprint author), NATL INST STAND & TECHNOL,BLDG 223,RM B152,GAITHERSBURG,MD 20899, USA. RI McMichael, Robert/J-8688-2012; Shull, Robert/F-5971-2013; OI McMichael, Robert/0000-0002-1372-664X NR 12 TC 362 Z9 365 U1 2 U2 53 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD JUN PY 1992 VL 111 IS 1-2 BP 29 EP 33 DI 10.1016/0304-8853(92)91049-Y PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JF843 UT WOS:A1992JF84300006 ER PT J AU LIU, C PARK, Y BADER, SD AF LIU, C PARK, Y BADER, SD TI RESISTANCE MINIMUM IN ULTRATHIN FERROMAGNETIC-FILMS OF FE ON MGO(100) SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Letter ID TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; EPITAXIAL-FILMS; SPIN-GLASS; LOCALIZATION; SURFACE; SYSTEMS; THIN; TEMPERATURE; ANISOTROPY AB Ultrathin films of Fe grown on MgO(100) in ultrahigh vacuum were studied in Situ as a function of temperature and thickness by means of sheet-resistance Rsquare, Kerr-effect, electron-diffraction and Auger measurements. Ferromagnetic hysteresis appears at room temperature for Fe dosages > 4 monolayers (almost-equal-to 5.7 angstrom). For films almost-equal-to 11 to 14 angstrom thick Rsquare has a minimum at the relatively high temperature of almost-equal-to 260 to 140 K, respectively, attributed to a crossover from 2 dimensional disordered to and 3D metallic system. RP LIU, C (reprint author), ARGONNE NATL LAB,DIV MAT SCI,BLDG 223,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Park, Yongsup/B-6387-2009 NR 40 TC 29 Z9 30 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD JUN PY 1992 VL 111 IS 3 BP L225 EP L230 DI 10.1016/0304-8853(92)91079-9 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JJ482 UT WOS:A1992JJ48200003 ER PT J AU DAVIS, BM LI, DX SEIDMAN, DN KETTERSON, JB BHADRA, R GRIMSDITCH, M AF DAVIS, BM LI, DX SEIDMAN, DN KETTERSON, JB BHADRA, R GRIMSDITCH, M TI ELASTIC AND NANOSTRUCTURAL PROPERTIES OF CU/PD SUPERLATTICES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NI THIN-FILMS; COMPOSITION-MODULATED ALLOYS; FOILS; MULTILAYERS; CONSTANTS; MODULUS; NICKEL; EVAPORATOR; PALLADIUM; ANOMALIES AB A series of Cu/Pd superlattices with composition modulation wavelengths (lambda's) ranging from 1.6 to 3.5 nm and a strong [111] growth texture were prepared by electron beam evaporation. The elastic properties of the films were examined using the methods of uniaxial tension tests [a Young's modulus (1/s11), where s(ij) is an elastic compliance] with the applied load parallel to the plane of the Cu/Pd interface and Brillouin scattering [a shear modulus (1/s44) with the shear waves parallel to the plane of the Cu/Pd interface]. Also, the films were characterized using both x-ray diffraction and high-resolution electron microscopy; this was done to assess the effect of the nanostructure on a possible "supermodulus effect." The films are nanostructurally very similar to the superlattice films employed in previous studies at Northwestern in which a supermodulus effect was reported. But, contrary to previous studies, no anomalous behavior was observed for the measured elastic properties of the thin films. Therefore the present results negate the earlier results and cast a serious doubt on the existence of a supermodulus effect. C1 NORTHWESTERN UNIV,ROBERT R MCCORMICK SCH ENGN & APPL SCI,MAT RES CTR,EVANSTON,IL 60208. NORTHWESTERN UNIV,COLL ARTS & SCI,DEPT PHYS & ASTRON,EVANSTON,IL 60208. NORTHWESTERN UNIV,COLL ARTS & SCI,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DAVIS, BM (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Seidman, David/B-6697-2009; Ketterson, John/B-7234-2009 NR 47 TC 15 Z9 16 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1992 VL 7 IS 6 BP 1356 EP 1369 DI 10.1557/JMR.1992.1356 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA HY106 UT WOS:A1992HY10600008 ER PT J AU UNAL, O MITCHELL, TE AF UNAL, O MITCHELL, TE TI CVD SI3N4 ON SINGLE-CRYSTAL SIC .2. HIGH-RESOLUTION ELECTRON-MICROSCOPY AND ATOMIC MODELS OF THE INTERFACE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID DEPOSITED SILICON-NITRIDE; ALPHA-SI3N4; MECHANISM; DEFECTS; GROWTH AB Interface studies of CVD Si3N4 grown on (111BAR) SiC single crystal substrates have been made by transmission electron microscopy (TEM). It is found that there are two orientation relationships both of which involve the same (1010BAR)Si3N4//(111BAR)SiC planar relationship. However, the orientation relationships are not perfect and rotations of 2-6-degrees are commonly seen between both directions and planes involved. High resolution electron microscopy (HREM) of the interfaces shows that the SiC and Si3N4 are continuous up to the interface and that no intermediate phases are formed. However, due to the small rotations, the HREM images are difficult to interpret directly in terms of atomic positions. Nevertheless, possible atomic models of the interface are proposed based upon the experimental findings. These models exploit the similarities between the [SiN4] and [SiC4] tetrahedra in Si3N4 and SiC, respectively. The observed orientation relationships appear to be due to matching of tetrahedra across the interface along with adequate lattice matches. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. NR 34 TC 9 Z9 9 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1992 VL 7 IS 6 BP 1445 EP 1454 DI 10.1557/JMR.1992.1445 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA HY106 UT WOS:A1992HY10600020 ER PT J AU SUSMAN, S ROWLAND, SC VOLIN, KJ AF SUSMAN, S ROWLAND, SC VOLIN, KJ TI THE PURIFICATION OF ELEMENTAL SULFUR SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Sulfur has been purified by a dynamic pyrolysis procedure that takes into account the unique viscosity-temperature relationship of the liquid. An apparatus is described that incorporates gas-bubbling and rocking to overcome diffusion-limited kinetics. For the first time, a mechanism is proposed for the pyrolytic purification of sulfur based upon Carsul formation and the H2S <-- --> H2Sx equilibrium. Infrared methods are delineated for qualitative analysis and quantitative estimates of anion contaminants, including the omnipresent hydrocarbon impurities. Our purified sulfur has a total carbon, oxygen, and hydrogen impurity level of <10-mu-g/g. C1 ANDREWS UNIV,DEPT PHYS,BERRIEN SPRINGS,MI 49104. RP SUSMAN, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 21 TC 9 Z9 9 U1 0 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1992 VL 7 IS 6 BP 1526 EP 1533 DI 10.1557/JMR.1992.1526 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA HY106 UT WOS:A1992HY10600028 ER PT J AU OLIVER, WC PHARR, GM AF OLIVER, WC PHARR, GM TI AN IMPROVED TECHNIQUE FOR DETERMINING HARDNESS AND ELASTIC-MODULUS USING LOAD AND DISPLACEMENT SENSING INDENTATION EXPERIMENTS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID SILICON; BEHAVIOR AB The indentation load-displacement behavior of six materials tested with a Berkovich indenter has been carefully documented to establish an improved method for determining hardness and elastic modulus from indentation load-displacement data. The materials included fused silica, soda-lime glass, and single crystals of aluminum, tungsten, quartz, and sapphire. It is shown that the load-displacement curves during unloading in these materials are not linear, even in the initial stages, thereby suggesting that the flat punch approximation used so often in the analysis of unloading data is not entirely adequate. An analysis technique is presented that accounts for the curvature in the unloading data and provides a physically justifiable procedure for determining the depth which should be used in conjunction with the indenter shape function to establish the contact area at peak load. The hardnesses and elastic moduli of the six materials are computed using the analysis procedure and compared with values determined by independent means to assess the accuracy of the method. The results show that with good technique, moduli can be measured to within 5%. C1 RICE UNIV,DEPT MAT SCI,HOUSTON,TX 77251. RP OLIVER, WC (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI zhang, mingjie/C-1507-2012 NR 37 TC 11858 Z9 12237 U1 107 U2 977 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1992 VL 7 IS 6 BP 1564 EP 1583 DI 10.1557/JMR.1992.1564 PG 20 WC Materials Science, Multidisciplinary SC Materials Science GA HY106 UT WOS:A1992HY10600033 ER PT J AU SPITZIG, WA OWEN, CV REED, LK AF SPITZIG, WA OWEN, CV REED, LK TI EFFECT OF HYDROGEN ON THE LOW-TEMPERATURE MECHANICAL-PROPERTIES OF V-5 AT PERCENT TI ALLOYS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID INTERSTITIAL ATOM COMPLEXES; FUSION-REACTOR APPLICATIONS; ANELASTIC RELAXATION; VANADIUM ALLOYS; DUCTILITY; NB; TA; SOLUBILITY; STRENGTH; NIOBIUM AB The effects of grain size and hydrogen in solid solution or as hydrides on the strength and ductility of V-5 at % Ti was studied over the temperature range 1 5-448 K. Comparison of the strength and ductility characteristics of hydrogenated alloys where hydrides were not observed down to 78 K (1.8 and 1.9 at % H alloys) or where hydrides were observed to form near 230 K (3.8 and 3.9 at % H alloys) indicated that the presence of hydride precipitates had no apparent influence on the strength or ductility characteristics. It appears that the main consequence of hydride precipitation is that hydrogen is removed from solid solution making strengthening less effective than expected based on the total hydrogen content. Decreasing grain size from 31-mu-m to 8-mu-m had no apparent effect on ductility in the nonhydrogenated alloys (< 0.05 at % H) but it did increase the strength over most of the temperature range and especially at 1 5 K. In the hydrogenated alloys this decrease in grain size lowered the transition temperature about 10 K and it appreciably increased the degree of ductility return at 78 K and below. The ductility return below 78 K peaked near 50 K before decreasing below 30 K with the improvement in ductility being greatest in the alloys with the lower hydrogen contents. RP SPITZIG, WA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 1 PY 1992 VL 27 IS 11 BP 2848 EP 2856 DI 10.1007/BF01154091 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HY330 UT WOS:A1992HY33000002 ER PT J AU SUGAMA, T CARCIELLO, N KUKACKA, LE GRAY, G AF SUGAMA, T CARCIELLO, N KUKACKA, LE GRAY, G TI INTERFACE BETWEEN ZINC PHOSPHATE-DEPOSITED STEEL FIBERS AND CEMENT PASTE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID CONVERSION COATINGS; CORROSION; CONCRETE AB In an attempt to protect steel fibre reinforcements from corrosion and improve their adherence to cement pastes, we deposited a zinc phosphate (ZnPh) conversion coating on the surface of the fibres. At the interfacial contact zones between the cement paste and ZnPh, alkali-induced dissolution caused the dissociation of abundant PO43- ions from the ZnPh. The interaction of PO43- ions with Ca2+ ions from the pastes led to the formation of hydroxyapatite and brushite in the vicinity of the dissolved ZnPh surface. Such intermediate calcium phosphate compounds played important roles in (1) improving the cement-fibre interfacial bonds, and (2) repairing the damage of the ZnPh surfaces dissolved by alkali. These processes protected the steel fibre from corrosion. C1 MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 17 TC 20 Z9 21 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 1 PY 1992 VL 27 IS 11 BP 2863 EP 2872 DI 10.1007/BF01154093 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA HY330 UT WOS:A1992HY33000004 ER PT J AU RAWERS, JC WRZESINSKI, WR AF RAWERS, JC WRZESINSKI, WR TI REACTION-SINTERED HOT-PRESSED TIAL SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID HIGH-TEMPERATURE SYNTHESIS; COMPOSITES AB Titanium aluminide intermetallic alloys and composites were formed from elemental titanium and aluminium powders by self propagating, high-temperature synthesis in an induction-heated hot-press. The crystal phases, density, transverse rupture stress, and hardness of the reaction-sintered compacts, were observed to be controlled by hot-pressing conditions. The principal phase formed was TiAl together with a significant second-phase concentration of Ti3Al. The transverse rupture strength (TRS) of the intermetallic composites was observed to vary directly with compact density. Under selected high-temperature synthesis hot-pressing conditions, TRS values were comparable to those obtained for fully dense TiAl. Titanium aluminide composites were formed by adding boron, carbon, silicon and Al2O3, and SiC powders and whiskers to the Ti-Al powders before reaction sintering. Changing the alloying additions did not have as strong an effect on properties of the composite compacts as did varying hot-pressing conditions. RP RAWERS, JC (reprint author), BUR MINES,ALBANY RES CTR,ALBANY,OR, USA. NR 12 TC 48 Z9 50 U1 0 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 JUN 1 PY 1992 VL 27 IS 11 BP 2877 EP 2886 DI 10.1007/BF01154095 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA HY330 UT WOS:A1992HY33000006 ER PT J AU BHATTACHARYA, AK AF BHATTACHARYA, AK TI TEMPERATURE ENTHALPY APPROACH TO THE MODELING OF SELF-PROPAGATING COMBUSTION SYNTHESIS OF MATERIALS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SOLIDIFICATION AB A new temperature-enthalpy approach has been proposed to model self-propagating combustion synthesis of advanced materials. This approach includes the effect of phase change which might take place during a combustion process. The effect of compact porosity is also modelled based on the conduction, convection and radiation in the local scale. Various parametric studies are made to analyse numerically the effects of activation energy, non-reacting phase content, porosity, Biot number, etc. The model predictions of the combustion pattern are in close agreement with those observed in experiments. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 22 TC 9 Z9 9 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUN 1 PY 1992 VL 27 IS 11 BP 3050 EP 3061 DI 10.1007/BF01154118 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA HY330 UT WOS:A1992HY33000029 ER PT J AU HOLCOMBE, CE WALKER, LR SWARTOUT, WM AF HOLCOMBE, CE WALKER, LR SWARTOUT, WM TI TRIBOCOR-532N AS A RELATIVELY INERT MATERIAL FOR USE AS CRUCIBLES MOLDS FOR MELTING RARE-EARTH ALLOYS SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article RP HOLCOMBE, CE (reprint author), OAK RIDGE Y-12 PLANT,POB 2009,OAK RIDGE,TN 37831, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUN 1 PY 1992 VL 11 IS 11 BP 777 EP 778 DI 10.1007/BF00729490 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA HY332 UT WOS:A1992HY33200022 ER PT J AU KHEYFETS, A MILLER, WA AF KHEYFETS, A MILLER, WA TI E CARTAN MOMENT OF ROTATION IN ASHTEKAR SELF-DUAL REPRESENTATION OF GRAVITATION SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB The geometric construction of the E. Cartan moment of rotation associated to the spacetime curvature provides a geometric interpretation of the gravitational field sources and describes geometrically how the sources are "wired" to the field in standard geometrodynamics. The E. Cartan moment of rotation yields an alternate way (as opposed to using variational principles) to obtain Einstein equations. The E. Cartan construction uses, in an essential way, the soldering structure of the frame bundle underlying the geometry of the gravitational field of general relativity. The geometry of Ashtekar's connection formulation of gravitation is based on a complex-valued self-dual connection that is not defined on the frame bundle of spacetime. It is shown how to transfer the construction of the E. Cartan moment of rotation of Ashtekar's formulation of the theory of gravity and demonstrate that no spurious equations are produced via this procedure. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP KHEYFETS, A (reprint author), N CAROLINA STATE UNIV,DEPT MATH,RALEIGH,NC 27695, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUN PY 1992 VL 33 IS 6 BP 2242 EP 2248 DI 10.1063/1.529645 PG 7 WC Physics, Mathematical SC Physics GA HV475 UT WOS:A1992HV47500031 ER PT J AU COLWELL, FS STORMBERG, GJ PHELPS, TJ BIRNBAUM, SA MCKINLEY, J RAWSON, SA VEVERKA, C GOODWIN, S LONG, PE RUSSELL, BF GARLAND, T THOMPSON, D SKINNER, P GROVER, S AF COLWELL, FS STORMBERG, GJ PHELPS, TJ BIRNBAUM, SA MCKINLEY, J RAWSON, SA VEVERKA, C GOODWIN, S LONG, PE RUSSELL, BF GARLAND, T THOMPSON, D SKINNER, P GROVER, S TI INNOVATIVE TECHNIQUES FOR COLLECTION OF SATURATED AND UNSATURATED SUBSURFACE BASALTS AND SEDIMENTS FOR MICROBIOLOGICAL CHARACTERIZATION SO JOURNAL OF MICROBIOLOGICAL METHODS LA English DT Article DE SUBSURFACE; ARGON; SEDIMENT; BASALT; QUALITY ASSURANCE ID DEEP TERRESTRIAL SUBSURFACE; BACTERIA; DIVERSITY; AQUIFER AB Basalt and sediment samples were cored from depths of up to 183 m at the Idaho National Engineering Laboratory (INEL) for evaluation of microbial abundance and diversity in the subsurface. The overall goal of the research is to understand subsurface microbial ecology to effectively conduct in situ bioremediation. To minimize the impact of sampling on the biological and chemical integrity of subsurface strata, argon (Ar) was used as an inert drilling fluid. Upon retrieval, cores were placed into Ar-filled chambers for processing. Subsamples for microbiological analyses were pared by hydraulic splitting and milled to diameters of 0. 1 - 0. 5 cm and then aseptically packaged for distribution to investigators. Multiple tracers measured potential contamination which may have occurred during drilling or coring. Fluorescent microspheres and lithium bromide (Br-) served as downhole tracers while gaseous perfluorocarbon tracers (PFTs) were used to monitor intrusion of drilling fluids into the cored zone. Tracer concentrations in samples indicated that microsphere and Br- occurrence and quantity was not necessarily correlated to the type of material cored but possibly related to characteristics of individual cores such as presence of fractures or core length. Microsphere and Br- concentrations indicated that, in samples provided to the investigators, any contaminating microbes or chemicals introduced during the coring process would have been diluted to the extent that they would have been insignificant. PFTs indicated gaseous intrusion into sediments and basalts deeper than the drill bit-stratum interface and provided evidence of Ar intrusion into the sample and ahead of the drill bit. Tracer data provided evidence that the quality control techniques employed protected the integrity of the subsurface samples. C1 UNIV TENNESSEE, INST APPL MICROBIOL, KNOXVILLE, TN 37932 USA. GOLDER ASSOCIATES INC, RICHLAND, WA 99352 USA. UNIV TEXAS, DIV EARTH & PHYS SCI, SAN ANTONIO, TX 78285 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. WHITMAN COLL, WALLA WALLA, WA 99362 USA. IDAHO STATE UNIV, POCATELLO, ID 83209 USA. RP COLWELL, FS (reprint author), IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. RI phelps, tommy/A-5244-2011; Long, Philip/F-5728-2013 OI Long, Philip/0000-0003-4152-5682 NR 15 TC 61 Z9 61 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-7012 J9 J MICROBIOL METH JI J. Microbiol. Methods PD JUN PY 1992 VL 15 IS 4 BP 279 EP 292 DI 10.1016/0167-7012(92)90047-8 PG 14 WC Biochemical Research Methods; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA JB484 UT WOS:A1992JB48400003 ER PT J AU LAGATTUTA, KJ AF LAGATTUTA, KJ TI LASER EFFECTS IN PHOTOIONIZATION - SPECTRUM OF RADIATION SCATTERED RESONANTLY BY ATOMIC-HYDROGEN SO JOURNAL OF MODERN OPTICS LA English DT Article ID NUMERICAL-SOLUTION; HARMONIC-GENERATION; COUPLED EQUATIONS; FLUORESCENCE; IONIZATION AB The spectrum of scattered radiation was computed for an electron, bound initially in the ground state of an isolated hydrogen atom and driven resonantly by the field of a moderately intense (approximately 10(13) W(cm)-2), linearly polarized laser. A numerical solution of the time-dependent Schrodinger equation was performed for the duration of a short (approximately 30 femtosecond) laser pulse. The spectrum of radiation scattered by this transient state was determined from the autocorrelation function of the electronic acceleration defined as: C(a)(t) = integral-infinity/-infinity dt'[1s\a(t').a(t' - t)\1s]. The spectral density of emitted radiation was then S(OMEGA) = (alpha-3/3-pi) integral-infinity/-infinity dt exp(i-OMEGA-t) C(a)(t). Numerical results are presented and comparison is made with an earlier less precise formulation. C1 UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. RP LAGATTUTA, KJ (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 15 TC 14 Z9 14 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0340 J9 J MOD OPTIC JI J. Mod. Opt. PD JUN PY 1992 VL 39 IS 6 BP 1181 EP 1194 DI 10.1080/713823540 PG 14 WC Optics SC Optics GA JA574 UT WOS:A1992JA57400003 ER PT J AU HOSONO, H FUKUSHIMA, H ABE, Y WEEKS, RA ZUHR, RA AF HOSONO, H FUKUSHIMA, H ABE, Y WEEKS, RA ZUHR, RA TI CROSS-SECTIONAL TEM OBSERVATION OF COPPER-IMPLANTED SIO2 GLASS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID STRUCTURAL DEFECTS AB Transmission electron microscopic observation has been made on SiO2 glass implanted to a dose of 6 x 10(16) ions/cm2 at an energy of 160 keV and in a sample implanted to 6 x 10(16) ions/cm2 at 160 keV and to 2 x 10(16) ions/cm2 at 35 keV. In the sample with 6 x 10(16) ions/cm2, the depth distribution of implanted Cu is bimodal in shape. It has been found that nano-sized particles of copper are formed in both depth regions of the bimodal distribution and the distribution of Cu colloid diameters has a shape that is close to that of implanted Cu concentrations. A triple layer of Cu colloid particles has been formed by sequential implantation using differing acceleration voltages (160 keV followed by 35 keV). C1 VANDERBILT UNIV,DEPT MAT SCI & ENGN,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP HOSONO, H (reprint author), NAGOYA INST TECHNOL,DEPT MAT SCI & ENGN,GOKISO CHO,SHOWA KU,NAGOYA,AICHI 466,JAPAN. RI Hosono, Hideo/J-3489-2013 OI Hosono, Hideo/0000-0001-9260-6728 NR 12 TC 67 Z9 68 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1992 VL 143 IS 2-3 BP 157 EP 161 DI 10.1016/S0022-3093(05)80564-2 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HZ276 UT WOS:A1992HZ27600008 ER PT J AU DEJUS, RJ SUSMAN, S VOLIN, KJ MONTAGUE, DG PRICE, DL AF DEJUS, RJ SUSMAN, S VOLIN, KJ MONTAGUE, DG PRICE, DL TI STRUCTURE OF VITREOUS AG-GE-SE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID INTERMEDIATE-RANGE ORDER; SYNCHROTRON RADIATION; GERMANIUM DISELENIDE; ELECTRONIC-STRUCTURE; NEUTRON-DIFFRACTION; ATOMIC CORRELATIONS; MOLECULAR-DYNAMICS; CRYSTAL-STRUCTURE; AMORPHOUS GESE2; THIN-FILMS AB Pulsed neutron diffraction has been used to study the short- and intermediate-range order of vitreous g-Ag4Ge3Se9. By utilizing the techniques of isotopic substitution and temperature variation, it has been possible to estimate four of the six partial pair-distribution functions for the first coordination shells. Measurements at T = 10 K extending out to wavevectors Q almost-equal-to 34 angstrom-1 provide accurate results for the bond lengths and coordination numbers. Comparison is also made with results derived from a variant of the maximum entropy method. Ge is fourfold-coordinated by Se at an average interatomic distance of 2.37 +/- 0.005 angstrom which is consistent with the GeSe4/2 tetrahedron also being a structural unit in the Ag-doped Ge-Se glass. Ag is predominantly bonded to Se at an average distance of 2.68 +/- 0.01 angstrom and is threefold-coordinated. This low coordination might be a key factor in understanding the fast ion motion in this system. The temperature dependence of the structure factor, S(Q), and the radial distribution functions were investigated. The Ge-Se and Se-Se correlations solely reflect increased thermal vibrations of the atoms, whereas the Ag correlations behave quite differently with increasing temperature up to 170-degrees-C. The Ag correlations change rapidly and become liquid-like at elevated temperatures reflecting the diffusive motion of Ag. The first sharp diffraction peak at 1.04 angstrom-1 in S(Q) exhibits the anomalous temperature dependence typical of chalcogenide glasses in that the peak becomes narrower and increases in amplitude with increasing temperature (approximately 2% from room temperature to 170-degrees-C). RP DEJUS, RJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Price, David Long/A-8468-2013 NR 55 TC 75 Z9 75 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1992 VL 143 IS 2-3 BP 162 EP 180 DI 10.1016/S0022-3093(05)80565-4 PG 19 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HZ276 UT WOS:A1992HZ27600009 ER PT J AU SATO, RK KIRKPATRICK, RJ BROW, RK AF SATO, RK KIRKPATRICK, RJ BROW, RK TI STRUCTURE OF LI,NA METAPHOSPHATE GLASSES BY P-31 AND NA-23 MAS-NMR CORRELATED WITH THE MIXED ALKALI EFFECT SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID PHOSPHORUS OXYNITRIDE GLASSES; CHEMICAL-SHIFTS; PHOSPHATES; AL-27 AB P-31 and Na-23 NMR spectra for glasses along the Li,Na metaphosphate join have been obtained by MAS-NMR spectroscopy. The P-31 results are interpreted in terms of phosphate Q2 (two bridging oxygens) tetrahedra. The P-31 chemical shifts become less shielded (less negative) with increasing [Na]/[Na + Li] ratio. This observation is rationalized in terms of increased paramagnetic deshielding due to increased average electron density in the P-O bonds with increasing [Na]/[Na + Li] ratio. The Na-23 peak maxima also become deshielded with increased [Na]/[Na + Li], suggesting the effects of Li-(non-bridging oxygen)-Na linkages. Both P-31 and Na-23 peaks have greater full-widths at half-height (FWHH) for the intermediate (mixed Li,Na) compositions compared with the Li or Na end-member, reflecting a greater distribution of P and Na sites due to the presence of both Li and Na. The glass transition temperatures have a minimum at [Na]/[Na + Li] = 0.6, thus showing a mixed alkali effect, previously explained by mixed alkali pairs (Li-NBO-Na) detected by the NMR experiments. C1 UNIV ILLINOIS,DEPT GEOL,1301 W GREEN ST,URBANA,IL 61801. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 28 TC 67 Z9 67 U1 2 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1992 VL 143 IS 2-3 BP 257 EP 264 DI 10.1016/S0022-3093(05)80575-7 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HZ276 UT WOS:A1992HZ27600019 ER PT J AU PAHL, RG PORTER, DL CRAWFORD, DC WALTERS, LC AF PAHL, RG PORTER, DL CRAWFORD, DC WALTERS, LC TI IRRADIATION BEHAVIOR OF METALLIC FAST-REACTOR FUELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON NUCLEAR MATERIALS FOR FISSION REACTORS, AT THE 1991 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC CY NOV 05-08, 1991 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, SERV DOCUMENTAT TOURIST PALAIS CONGRES STRASBOURG, EUROPEAN PARLIAMENT AB Metallic fuels were the first fuels chosen for liquid metal cooled fast reactors (LMRs). In the late 1960s worldwide interest turned toward ceramic LMR fuels before the full potential of metallic fuel was realized. However, during the 1970s the performance limitations of metallic fuel were resolved in order to achieve a high plant factor at the Argonne National Laboratory's Experimental Breeder Reactor II. The 1980s spawned renewed interest in metallic fuel when the Integral Fast Reactor (IFR) concept emerged at Argonne National Laboratory. A fuel performance demonstration program was put into place to obtain the data needed for the eventual licensing of metallic fuel. This paper will summarize the results of the irradiation program carried out since 1985. RP PAHL, RG (reprint author), ARGONNE NATL LAB,DIV FUELS & ENGN,IDAHO FALLS,ID 83402, USA. OI Crawford, Douglas/0000-0001-5639-7885 NR 8 TC 32 Z9 32 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1992 VL 188 BP 3 EP 9 DI 10.1016/0022-3115(92)90447-S PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JC611 UT WOS:A1992JC61100002 ER PT J AU CUNNINGHAM, ME FRESHLEY, MD LANNING, DD AF CUNNINGHAM, ME FRESHLEY, MD LANNING, DD TI DEVELOPMENT AND CHARACTERISTICS OF THE RIM REGION IN HIGH BURNUP UO2 FUEL PELLETS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON NUCLEAR MATERIALS FOR FISSION REACTORS, AT THE 1991 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC CY NOV 05-08, 1991 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, SERV DOCUMENTAT TOURIST PALAIS CONGRES STRASBOURG, EUROPEAN PARLIAMENT AB Research to define the behavior of Zircaloy-clad light-water reactor fuel irradiated to high burnup levels was conducted as part of the High Burnup Effects Program. One observed microstructural change related to irradiation to high burnup levels (up to 83 MWd/kgM pellet-average) is the development of a well-defined, unique microstructural region at the fuel pellet edge (rim). This rim region is characterized by the loss of optically-definable grain structure, increased porosity, and the depletion of matrix fission gas. The rim region holds the potential for significant localized increases in the athermal release of fission gases at high burnup levels, but the contribution of the rim release to the fractional release of the total fission gas produced in the rod is small. RP CUNNINGHAM, ME (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 6 TC 62 Z9 62 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1992 VL 188 BP 19 EP 27 DI 10.1016/0022-3115(92)90449-U PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JC611 UT WOS:A1992JC61100004 ER PT J AU THOMAS, LE BEYER, CE CHARLOT, LA AF THOMAS, LE BEYER, CE CHARLOT, LA TI MICROSTRUCTURAL ANALYSIS OF LWR SPENT FUELS AT HIGH BURNUP SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID STATE AB The microstructural changes in commercial light-water reactor (LWR) fuels irradiated to average burnups near 50 MWd/kgM were studied by analytical transmission electron microscopy and Auger electron spectrometry. Several poorly understood aspects of the fuel behavior were examined, including (a) precipitation of the fission gases in dense, highly pressurized inclusions, (b) apparent solution of Cs, Ba, Zr, and Te in the UO2 matrix, and (c) the "rim effect" involving restructuring of the enhanced burnup region at the fuel outer edges. Initial observations of the high-burnup rim showed an extremely fine-grained structure formed by recrystallization of the original UO2. The restructuring is a burnup-induced instability of the UO2, possibly driven by the stored energy of fission products in solution, and is expected to extend across LWR fuel pellets irradiated to higher burnups. RP THOMAS, LE (reprint author), PACIFIC NW LAB, POB 999, MS P8-15, RICHLAND, WA 99352 USA. NR 25 TC 66 Z9 66 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUN PY 1992 VL 188 BP 80 EP 89 DI 10.1016/0022-3115(92)90457-V PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JC611 UT WOS:A1992JC61100012 ER PT J AU BREITZ, HB WEIDEN, PL VANDERHEYDEN, JL APPELBAUM, JW BJORN, MJ FER, MF WOLF, SB RATLIFF, BA SEILER, CA FOISIE, DC FISHER, DR SCHROFF, RW FRITZBERG, AR ABRAMS, PG AF BREITZ, HB WEIDEN, PL VANDERHEYDEN, JL APPELBAUM, JW BJORN, MJ FER, MF WOLF, SB RATLIFF, BA SEILER, CA FOISIE, DC FISHER, DR SCHROFF, RW FRITZBERG, AR ABRAMS, PG TI CLINICAL-EXPERIENCE WITH RHENIUM-186-LABELED MONOCLONAL-ANTIBODIES FOR RADIOIMMUNOTHERAPY - RESULTS OF PHASE-I TRIALS SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID THERAPY; ANTIGENS; CANCER; XENOGRAFTS; FRAGMENTS; CARCINOMA; TOXICITY; RE-186; MODEL; LUNG AB Rhenium is a radionuclide with physical and chemical properties suitable for radioimmunotherapy. Two Phase I trials were carried out using Re-186-labeled murine monoclonal antibodies. Patients with refractory metastatic epithelial carcinoma received single doses of either Re-186-labeled intact NR-LU-10, a pancarcinoma antibody, 25-120 mCi/m2 (n = 15) or Re-186-labeled F(ab')2 fragment of NR-CO-02, an anti-CEA variant antibody, 25-200 mCi/m2 (n = 31). Prior to radioimmunotherapy, tumor localization of antibody was confirmed by Tc-99m-labeled NR-LU-10 Fab or Tc-99m-labeled NR-CO-02 F(ab')2 imaging. Dose-limiting myelosuppression was observed at 120 mCi/m2 following Re-186-NR-LU-10 intact antibody and at 150 mCi/m2 following NR-CO-02 F(ab')2 fragment in heavily pretreated patients. In patients with minimal prior therapy, a maximum tolerated dose for NR-CO-02 F(ab')2 was not reached by 200 mCi/m2. Non-marrow toxicity was minimal. Human anti-mouse antibody developed in all patients receiving intact NR-LU-10, and in 86% patients receiving F(ab')2 NR-CO-02. One patient treated with Re-186 NR-CO-02 achieved a partial response. We conclude that Re-186-labeled antibody can be safely administered with significant toxicity limited to marrow. C1 PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA. NEORX CORP, SEATTLE, WA USA. RP BREITZ, HB (reprint author), VIRGINIA MASON MED CTR, DEPT RADIOL, POB 900, C2S, SEATTLE, WA 98111 USA. NR 44 TC 138 Z9 141 U1 0 U2 3 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 USA SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD JUN PY 1992 VL 33 IS 6 BP 1099 EP 1112 PG 14 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA HX245 UT WOS:A1992HX24500007 PM 1597723 ER PT J AU JARVIS, EE DUNAHAY, TG BROWN, LM AF JARVIS, EE DUNAHAY, TG BROWN, LM TI DNA NUCLEOSIDE COMPOSITION AND METHYLATION IN SEVERAL SPECIES OF MICROALGAE SO JOURNAL OF PHYCOLOGY LA English DT Article DE CRYPTHECODINIUM-COHNII; CYCLOTELLA-CRYPTICA; DNA COMPOSITION; DNA METHYLATION; GC CONTENT; MONORAPHIDIUM-MINUTUM; NITZSCHIA-PUSILLA; PHAEODACTYLUM-TRICORNUTUM; STICHOCOCCUS; TETRASELMIS-SUECICA ID HIGHER-PLANT DNA; CHLAMYDOMONAS-REINHARDTII; NUCLEAR TRANSFORMATION; ESCHERICHIA-COLI; GENE; RESTRICTION; SEQUENCE; SPECIFICITY; EXPRESSION; ALGAE AB Total DNA was isolated from 10 species of microalgae, including representatives of the Chlorophyceae (Chlorella ellipsoidea, Chlamydomonas reinhardtii, and Monoraphidium minutum), Bacillariophyceae (Cyclotella cryptica, Navicula saprophila, Nitzschia pusilla, and Phaeodactylum tricornutum), Charophyceae (Stichococcus sp.), Dinophyceae (Crypthecodinium cohnii), and Prasinophyceae (Tetraselmis suecica). Control samples of Escherichia coli and calf thymus DNA were also analyzed. The nucleoside base composition of each DNA sample was determined by reversed-phase high performance liquid chromatography. All samples contained 5-methyldeoxycytidine, although at widely varying levels. In M. minutum, about one-third of the cytidine residues were methylated. Restriction analysis supported this high degree of methylation in M. minutum and suggested that methylation is biased toward 5'-CG dinucleotides. The guanosine + cytosine (GC) contents of the green algae were, with the exception of Stichococcus sp., consistently higher than those of the diatoms. Monoraphidium minutum exhibited an extremely high GC content of 71%. Such a value is rare among eukaryotic organisms and might indicate an unusual codon usage. This work is important for developing strategies for transformation and gene cloning in these algae. RP JARVIS, EE (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 46 TC 23 Z9 23 U1 1 U2 14 PU PHYCOLOGICAL SOC AMER INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044 SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD JUN PY 1992 VL 28 IS 3 BP 356 EP 362 DI 10.1111/j.0022-3646.1992.00356.x PG 7 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA HZ755 UT WOS:A1992HZ75500013 ER PT J AU HO, KM ELSASSER, C CHAN, CT FAHNLE, M AF HO, KM ELSASSER, C CHAN, CT FAHNLE, M TI 1ST-PRINCIPLES PSEUDOPOTENTIAL CALCULATIONS FOR HYDROGEN IN 4D-TRANSITION METALS .1. MIXED-BASIS METHOD FOR TOTAL ENERGIES AND FORCES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; GROUND-STATE PROPERTIES; TRANSITION-METALS; ELECTRONIC-STRUCTURE; BRILLOUIN-ZONE; SPECIAL POINTS; SOLIDS; DENSITY; FORMALISM; MATRICES AB A first-principles study of hydrogen in transition metals within the framework of the Born-Oppenheimer and local density-functional approximations using a mixed-basis pseudopotential method is presented in this work, which consists of two parts. In this first part our computational techniques are outlined. The features of the norm-conserving ionic pseudopotentials, the mixed basis and the calculation of total energies are summarized. A mixed-basis formalism for the calculation of forces on atoms in crystals, using the Hellmann-Feynman theorem and including contributions originating from the atom-centred localized functions in the mixed basis, is described in detail and applied to the example of restoring forces in PdH. An application to a study of vibrational properties of hydrogen isotopes in Pd and Nb will follow in the second part. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. MAX PLANCK INST MET RES,INST PHYS,W-7000 STUTTGART 80,GERMANY. RP HO, KM (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 35 TC 113 Z9 113 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 1 PY 1992 VL 4 IS 22 BP 5189 EP 5206 DI 10.1088/0953-8984/4/22/017 PG 18 WC Physics, Condensed Matter SC Physics GA HY393 UT WOS:A1992HY39300017 ER PT J AU ELSASSER, C HO, KM CHAN, CT FAHNLE, M AF ELSASSER, C HO, KM CHAN, CT FAHNLE, M TI 1ST-PRINCIPLES PSEUDOPOTENTIAL CALCULATIONS FOR HYDROGEN IN 4D-TRANSITION METALS .2. VIBRATIONAL-STATES FOR INTERSTITIAL HYDROGEN ISOTOPES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID PALLADIUM-HYDROGEN; DIFFUSION; PD; SUPERCONDUCTIVITY; ANHARMONICITY; IMPURITIES; DEPENDENCE; DYNAMICS; NIOBIUM; CRYSTAL AB In this second part of our first-principles study of hydrogen in transition metals within the framework of the Born-Oppenheimer and the local density-functional approximations, the mixed-basis pseudopotential method, which was outlined in the first part, is applied to calculate total energies and internal forces in Pd(n)H supercells with n less-than-or-equal-to 32 and Nb(n)H supercells with n less-than-or-equal-to 4. Adiabatic potentials for H in PdH and NbH are determined and the influence of lattice relaxations is discussed. Analytic model potentials are fitted to the first-principles results, and the importance of anharmonicity for vibrational states of interstitial H isotopes is investigated. By comparing our calculated vibrational energies with results from neutron-scattering experiments, we find that for NbH the anharmonicity is weak and the results obtained in harmonic approximation or via perturbation theory are in good agreement with experiment. For PdH the harmonic approximation as well as the perturbation theory are insufficient. The anharmonicity and the periodicity of the adiabatic potential need to be represented carefully by a Fourier series. Then the agreement with experiment is found to be as good as for NbH and even allows us to propose a reinterpretation of the experimental data. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP ELSASSER, C (reprint author), MAX PLANCK INST MET RES,INST PHYS,HEISENBERGSTR 1,W-7000 STUTTGART 80,GERMANY. NR 32 TC 53 Z9 53 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 1 PY 1992 VL 4 IS 22 BP 5207 EP 5226 DI 10.1088/0953-8984/4/22/018 PG 20 WC Physics, Condensed Matter SC Physics GA HY393 UT WOS:A1992HY39300018 ER PT J AU AGRAWAL, HM GARG, JB TIKKU, VK HARVEY, JA MACKLIN, RL AF AGRAWAL, HM GARG, JB TIKKU, VK HARVEY, JA MACKLIN, RL TI HIGH-RESOLUTION NEUTRON TOTAL AND CAPTURE CROSS-SECTIONS IN ZN-67 SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article ID RESONANCE PARAMETERS AB High-resolution measurements of the neutron total and capture cross sections have been performed on the separated isotope Zn-67 in the energy range from a few keV to about 1 MeV using the neutron time of flight technique and the pulsed Oak Ridge Electron Linear Accelerator. From R-matrix analysis of the total cross section data up to approximately 180 keV and least-squares fitting of capture data up to approximately 24 keV, values of E0, g-GAMMA(n), J(pi) and GAMMA(gamma-0) for resonances have been obtained. These results have provided the following values of average quantities: [S0J=2(X10(4)) = (1.35 +/- 0.15), S0J=3(X10(4)) = (2.23 +/- 0.34) and S0J=2,3(X10(4)) = (1.86 +/- 0.20) up to 180 keV], [D0J=2 = (1.09 +/- 0.06) keV, D0J=3 = (0.83 +/- 0.04) keV and D0J=2,3 = (413 +/- 28) eV up to 50 keV], [S1(X10(4)) = (0.72 +/- 0.07) and D1 = (137 +/- 14) eV up to 24 keV]. The value of average radiation width is (0.44 +/- 0.06) eV for 47 s-wave resonances up to approximately 24 keV. The investigation of the statistical properties of s-wave neutron-reduced widths and level spacings for each J(pi)(2-, 3-) showed fairly good agreement of the data with the Porter-Thomas distribution for neutron reduced widths, and the Dyson-Mehta-DELTA-3 statistic and the Wigner distribution for the level spacing distribution up to 50 keV. No correlation between GAMMA(n)0 and GAMMA(gamma-0) has been observed for 47 s-wave resonances in contrast to the reported significant correlation for other nuclei in this mass region. The experimental ratio of s to p wave levels was found to be (3 +/- 0.4). This is much larger than the theoretical prediction of 1.78 (for sigma = 3.5), suggestive of a parity dependence of the level density at high excitation. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. SUNY ALBANY,ALBANY,NY 12222. NR 27 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD JUN PY 1992 VL 18 IS 6 BP 1069 EP 1087 DI 10.1088/0954-3899/18/6/008 PG 19 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA HY343 UT WOS:A1992HY34300008 ER PT J AU SAMARA, GA AF SAMARA, GA TI PRESSURE-DEPENDENCE OF THE BETA-MOLECULAR RELAXATION PROCESS AND DIELECTRIC-PROPERTIES OF POLYVINYLIDENE FLUORIDE SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE DIELECTRIC PROPERTIES OF POLY(VINYLIDENE FLUORIDE), PRESSURE DEPENDENCE OF; POLY(VINYLIDENE FLUORIDE), PRESSURE DEPENDENCE OF RELAXATION AND DIELECTRIC PROPERTIES OF ID VOGEL-FULCHER LAW; POLY(VINYLIDENE FLUORIDE); VINYLIDENE FLUORIDE; FREE-VOLUME; POLYMERS; TRIFLUOROETHYLENE; COPOLYMERS; ENTROPY AB The effects of hydrostatic pressure to 20 kbar on the beta-molecular relaxation process of polyvinylidene fluoride (PVDF) and on the dielectric properties in the neighborhood of this relaxation have been investigated. This relaxation has a strong influence on the electrical and mechanical properties of PVDF. Pressure causes a large shift to higher temperatures (approximately 10K/kbar) of the dielectric relaxation peak and a decrease in the width of the distribution of relaxation times. This slowing down of the relaxation process is discussed in terms of the Vogel-Fulcher equation and related models, and it results from an increase in both the energy barrier to dipolar motion and the reference temperature (T0) for the kinetic relaxation process which represents the "static" dipolar freezing temperature for the process. The general applicability of the Vogel-Fulcher equation to relaxional processes in polymers and other systems is briefly discussed. The pressure dependence of the dielectric constant both above and below the relaxation peak temperature (T(max)) is found to be dominated by the change in polarizability. The effect is larger above T(max) because of the relatively large decrease in the dipolar orientational polarizability with pressure. RP SAMARA, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 31 TC 15 Z9 15 U1 0 U2 7 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD JUN PY 1992 VL 30 IS 7 BP 669 EP 679 DI 10.1002/polb.1992.090300703 PG 11 WC Polymer Science SC Polymer Science GA HU280 UT WOS:A1992HU28000003 ER PT J AU LAMB, JD NORDMEYER, FR SMITH, RG VANORDEN, A ALLISON, R LASH, RP AF LAMB, JD NORDMEYER, FR SMITH, RG VANORDEN, A ALLISON, R LASH, RP TI SEPARATION AND ANALYSIS OF RADIOIODINE IN NUCLEAR REPROCESSING SOLUTIONS OF HIGH IONIC-STRENGTH SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article ID IODINE AB Ion chromatography (IC) can be used to separate radioiodine from fission products and other ionic species in complex reprocessing solution matrices. A preliminary concentration and separation of the radioiodine is performed using a column filled with a platinum-coated copper bed which converts all forms of iodine to iodide and selectively adsorbs the iodide. The separation is completed by employing an anion chromatographic system. The iodide peak aliquot is collected for subsequent radioanalysis by low energy photon spectroscopy. Results indicate quantitative separation and recovery of iodine. The entire system is automated under computer control and is able to handle small (mu-l) and large (500 ml) sample sizes. C1 WESTINGHOUSE IDAHO NUCL CO,IDAHO FALLS,ID 83403. RP LAMB, JD (reprint author), BRIGHAM YOUNG UNIV,DEPT CHEM,PROVO,UT 84602, USA. RI Van Orden, Alan/N-4219-2015 NR 12 TC 1 Z9 1 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD JUN PY 1992 VL 159 IS 2 BP 285 EP 292 DI 10.1007/BF02040722 PG 8 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JF676 UT WOS:A1992JF67600011 ER PT J AU FELMY, AR RAI, D MASON, MJ AF FELMY, AR RAI, D MASON, MJ TI THE SOLUBILITY OF CAMOO4(C) AND AN AQUEOUS THERMODYNAMIC MODEL FOR CA2+-MOO4(2-) ION-INTERACTIONS SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE CALCIUM; MOLYBDATE; AQUEOUS; THERMODYNAMIC; COMPLEXATION ID NATURAL-WATERS; INTERACTION PARAMETERS; MINERAL SOLUBILITIES; PREDICTION; 25-DEGREES-C; ELECTROLYTES; SULFATE; SYSTEM AB The solubility of powellite [CaMoO4(C)] was studied in aqueous Na2MoO4, CaCl2 and Ca(NO3)2 solutions ranging in concentrations from 1x10(-4)M to 1.0M and over equilibration times extending to 36 days. Our experimental data were interpreted using the aqueous ion-interaction model of Pitzer and coworkers. The Ca2+-MoO42- ion-interactions were found to be analogous to Ca2+-SO42-. The use of Ca2+-MoO42- ion-interactions parameters (beta(0) = 0.2, beta(1) = 3.1973 and beta(2) = -54.24) and a log K(sp) of -7.93 gave excellent predictions of all of the experimental data. Common-ion ternary interaction parameters such as MoO42--Cl- or MoO42--NO3- were not required. RP FELMY, AR (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 15 TC 9 Z9 9 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD JUN PY 1992 VL 21 IS 6 BP 525 EP 532 DI 10.1007/BF00649561 PG 8 WC Chemistry, Physical SC Chemistry GA HY661 UT WOS:A1992HY66100002 ER PT J AU PLIMPTON, SJ MICHAEL, JR ROMIG, AD AF PLIMPTON, SJ MICHAEL, JR ROMIG, AD TI PARALLEL SIMULATION OF ELECTRON-SOLID INTERACTIONS FOR ELECTRON-MICROSCOPY MODELING SO JOURNAL OF SUPERCOMPUTING LA English DT Article DE MONTE-CARLO; PARALLEL; ELECTRON; MICROSCOPY; RANDOM NUMBER GENERATION ID RANDOM NUMBER GENERATORS; VECTORIZATION; CODE AB A parallel implementation of a Monte Carlo algorithm for modeling the scattering of electrons in solids and the resulting X-ray production is described. Two important issues for accurate and fast parallel simulation are discussed-random number generation and load-balancing. Timing results for the parallel simulation are given which show even modest-sized parallel machines can be competitive with conventional vector supercomputers for Monte Carlo trajectory simulations. Examples of parallel calculations performed to analyze specimen composition data and to characterize electron microscope performance are briefly highlighted. C1 SANDIA NATL LABS,CTR MAT & PROC SCI,ALBUQUERQUE,NM 87185. RP PLIMPTON, SJ (reprint author), SANDIA NATL LABS,DEPT PARALLEL COMPUTAT SCI 1421,ALBUQUERQUE,NM 87185, USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0920-8542 J9 J SUPERCOMPUT JI J. Supercomput. PD JUN PY 1992 VL 6 IS 2 BP 139 EP 151 DI 10.1007/BF00129775 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JX860 UT WOS:A1992JX86000003 ER PT J AU GEIST, GA GINATEMPO, B SHELTON, WA STOCKS, GM AF GEIST, GA GINATEMPO, B SHELTON, WA STOCKS, GM TI PARALLEL SUPERCONDUCTOR CODE ON THE IPSC/860 SO JOURNAL OF SUPERCOMPUTING LA English DT Article DE MATERIALS SCIENCE; 1ST PRINCIPLES; PARALLEL COMPUTATION; PVM ID ALLOYS AB Researchers at Oak Ridge National Laboratory have developed an application code tor calculating the electronic properties and energetics of disordered materials. The same source code has been compiled and run on workstations, Crays, and the Intel iPSC/860. This electronic structures code is capable of running at over 2 gigaflops on both an 8-processor CRAY Y-MP and a 128-processor Intel iPSC/860. Using this new KKR-CPA code, we executed density of-state computations of a perovskite superconductor at a rate of 2527 megaflops on the Intel iPSC/860. This corresponds to a price/performance rate of 842 megaflops per $1 million based on the list price of this computer. Similar but smaller computations done on a network of ten IBM RS/6000 workstations executed at a price/performance rate of 1.3 gigaflops per $1 million. C1 USN,RES LAB,WASHINGTON,DC 20375. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV MESSINA,CISM,UNITA GRP NAZL STRUTTURA MAT,IST FIS TEOR,I-98100 MESSINA,ITALY. RP GEIST, GA (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,POB 2008,OAK RIDGE,TN 37831, USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 10 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0920-8542 J9 J SUPERCOMPUT JI J. Supercomput. PD JUN PY 1992 VL 6 IS 2 BP 153 EP 162 DI 10.1007/BF00129776 PG 10 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JX860 UT WOS:A1992JX86000004 ER PT J AU KRESIN, VZ AF KRESIN, VZ TI SUPERCONDUCTING STATE IN M3C60 - STRONG VS WEAK-COUPLING SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SUPERCONDUCTIVITY; FULLERENES; COUPLING STRENGTH ID TRANSITION-TEMPERATURE AB The superconducting state in the doped fullerenes is due to strong coupling (e.g., lambda almost-equal-to 2.1 for Rb3C60) to low-frequency intramolecular modes OMEGA is-approximately-equal-to OMEGA(L) almost-equal-to 250 cm-1 (OMEGA = [OMEGA2]1/2). The analysis is based on an equation describing T(c) for any strength of the coupling and on recent isotope effect and NMR data. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 21 TC 2 Z9 2 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD JUN PY 1992 VL 5 IS 3 BP 297 EP 300 DI 10.1007/BF00617630 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JT192 UT WOS:A1992JT19200010 ER PT J AU ROBERTS, PM PHILLIPS, WS FEHLER, MC AF ROBERTS, PM PHILLIPS, WS FEHLER, MC TI DEVELOPMENT OF THE ACTIVE DOUBLET METHOD FOR MEASURING SMALL VELOCITY AND ATTENUATION CHANGES IN SOLIDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID MOUNT ST-HELENS; CENTRAL CALIFORNIA; EARTHQUAKES; WAVES AB The measurement of small changes in elastic wave velocity and attenuation is important to a broad range of problems, such as earthquake prediction and early detection of rock failure in mines. Previous authors proposed a method for estimating small temporal velocity changes in the earth's crust by analyzing progressive relative phase delays between the scattered waves of two signals generated by nearly identical earthquake sources, called doublets, recorded at different times at the same receivers. Several improvements have been made to the original method and are presented here. The reliability of measured velocity changes has been increased by using active, repeatable sources instead of natural earthquakes. The robustness of the analysis technique has been improved by eliminating unnecessary intermediate phase regression steps and thus reducing the sensitivity to spurious data. Finally, the phase-delay algorithm has been extended to allow measurement of small attenuation changes from relative amplitude decay rates. Using ultrasonic source and receiver transducers embedded in Plexiglas test samples, velocity changes as small as 0.01%, caused by ambient temperature variations in the Plexiglas, have been measured. Changes in attenuation on the order of 10%, due to permanent damage induced in one of the samples, have also been measured. RP ROBERTS, PM (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,GEOENGN GRP,EES-4,MAIL STOP D443,LOS ALAMOS,NM 87545, USA. NR 19 TC 35 Z9 41 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1992 VL 91 IS 6 BP 3291 EP 3302 DI 10.1121/1.402864 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HX655 UT WOS:A1992HX65500021 ER PT J AU ELLISON, AJG NAVROTSKY, A AF ELLISON, AJG NAVROTSKY, A TI ENTHALPY OF FORMATION OF ZIRCON SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE ZIRCON; ENTHALPY; FORMATION; OXIDES; FREE ENERGY ID CALORIMETRY AB Using high-temperature solution calorimetry in molten 2PbO.B2O3, the enthalpy of reaction of the formation of zircon, ZrSiO4, from its constituent oxides has been determined: DELTA(r)H977(ZrSiO4) = -27.9 (+/-1.9) kJ/mol. With previously reported data for the heat contents of ZrO2, SiO2, and ZrSiO4 and standard-state enthalpies of formation of ZrO2 and SiO2, we obtain DELTA(f)H298-degrees.(ZrSiO4) = -2034.2 (+/-3.1) kJ/mol and DELTA(f)G298-degrees (ZrSiO4) = -1919.8 kJ/mol. The free energy value is in excellent agreement with a range previously estimated from solid-state reaction equilibria. At higher temperature also the data are in close agreement with existing data, though the data sets diverge somewhat with increasing T. The limitations of the data for predicting the breakdown temperature of zircon into its constituent oxides are discussed. C1 PRINCETON UNIV,DEPT GEOL & GEOPHYS SCI,PRINCETON,NJ 08544. RP ELLISON, AJG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 35 Z9 37 U1 2 U2 8 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1992 VL 75 IS 6 BP 1430 EP 1433 DI 10.1111/j.1151-2916.1992.tb04205.x PG 4 WC Materials Science, Ceramics SC Materials Science GA HZ219 UT WOS:A1992HZ21900019 ER PT J AU WADE, RK PETROVIC, JJ AF WADE, RK PETROVIC, JJ TI FRACTURE MODES IN MOSI2 SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE MOLYBDENUM; SILICIDES; INDENTATION; FRACTURE TOUGHNESS; HARDNESS ID MATRIX COMPOSITES; CRACK-DEFLECTION AB The room-temperature fracture behavior of polycrystalline MoSi2 was characterized using Vickers indentation fracture. Fracture analysis was aided by the optically active grain structure of MoSi2 revealed under polarized light. Radial crack propagation from indentations was found to be predominantly transgranular. The approximate indentation fracture toughness of MoSi2 was 3 MPa.m1/2, while the measured hardness was 8.7 GPa. Fracture behavior is believed to be controlled by anisotropy and cleavage energy of the tetragonal MoSi2 crystal structure. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,CERAM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545. RP WADE, RK (reprint author), UNIV ARIZONA,DEPT MAT SCI & ENGN,ARIZONA MAT LABS,TUCSON,AZ 85712, USA. NR 26 TC 55 Z9 56 U1 4 U2 5 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1992 VL 75 IS 6 BP 1682 EP 1684 DI 10.1111/j.1151-2916.1992.tb04246.x PG 3 WC Materials Science, Ceramics SC Materials Science GA HZ219 UT WOS:A1992HZ21900060 ER PT J AU PICARD, R BRYSON, M AF PICARD, R BRYSON, M TI CALIBRATED SEISMIC VERIFICATION OF THE THRESHOLD TEST BAN TREATY SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE ARMS CONTROL; BAYESIAN METHODS; CALIBRATION; EXPERT OPINION; VERIFICATION TECHNOLOGY ID UNDERGROUND NUCLEAR-EXPLOSIONS; WEAPONS AB To improve verification of the Threshold Test Ban Treaty, the United States and Russia have embarked on an effort to make on-site yield measurements of each other's nuclear tests. Beyond their direct use in verification, these measurements also may prove useful in calibrating a monitoring system based on seismic magnitudes. The relative merits of seismic monitoring vis-a-vis on-site measurement have been at the core of a long-standing controversy. Many seismic verification problems hinge on statistical issues, including linear calibration based on a small data set and the formal use of expert opinion. RP PICARD, R (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 31 TC 2 Z9 2 U1 0 U2 1 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD JUN PY 1992 VL 87 IS 418 BP 293 EP 299 PG 7 WC Statistics & Probability SC Mathematics GA HW622 UT WOS:A1992HW62200004 ER PT J AU CHEN, JS DEVINE, TM SALMERON, M AF CHEN, JS DEVINE, TM SALMERON, M TI BRITTLE-FRACTURE OF CU-30 AU INDUCED BY A SURFACE-LAYER SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID STRESS-CORROSION CRACKING AB A dealloyed surface layer formed on Cu-30 Au with zero applied stress by anodic polarization in 0.6M NaCl was found to be capable of inducing intergranular fracture of the normally ductile substrate during impact loading. If the sample was simultaneously stressed and dealloyed, the fracture mode was transgranular cleavage. The results indicate that the mechanisms of intergranular stress corrosion cracking and transgranular stress corrosion cracking of Cu-30 Au are identical. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CHEN, JS (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JUN PY 1992 VL 139 IS 6 BP L55 EP L57 DI 10.1149/1.2069496 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HX978 UT WOS:A1992HX97800001 ER PT J AU RYE, RR CHI, KM HAMPDENSMITH, M KODAS, TT AF RYE, RR CHI, KM HAMPDENSMITH, M KODAS, TT TI PATTERNED DEPOSITION OF COPPER ON POLY(TETRAFLUOROETHYLENE) SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID CU-TEFLON ADHESION; POLYTETRAFLUOROETHYLENE; RADIATION AB A three step process has been developed for patterned deposition of Cu onto poly(tetrafluoroethylene) (PTFE). The first step involves patterned irradiation with low doses of x-rays or electrons which cross-link the PTFE surface; step two involves chemical etching with the result that only the nonirradiated, noncross-linked areas are etched; and step three involves selective chemical vapor deposition (CVD) of Cu onto the etched surface at 200-degrees-C using (hexafluoroacetylacetonato)Cu(I)trimethylphosphine ((hfac)Cu(PMe3)). The nonirradiated surface is activated for selective Cu CVD by the chemical etching step, while the irradiated portions remain unactivated due to cross-linking. Continuous Cu films with resistivities of 4-mu-ohm-cm are formed on the nonirradiated areas. X-ray photoelectron spectra show the nonirradiated areas of the surface to be covered by pure Cu with only surface impurities resulting from air transfer of the samples, while the irradiated areas show the presence of only C and F, characteristic of PTFE. C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP RYE, RR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 12 TC 29 Z9 29 U1 1 U2 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JUN PY 1992 VL 139 IS 6 BP L60 EP L61 DI 10.1149/1.2069498 PG 2 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HX978 UT WOS:A1992HX97800003 ER PT J AU BERMAN, SM FEIN, G JEWETT, DL SAIKA, G ASHFORD, F AF BERMAN, SM FEIN, G JEWETT, DL SAIKA, G ASHFORD, F TI SPECTRAL DETERMINANTS OF STEADY-STATE PUPIL SIZE WITH FULL FIELD OF VIEW SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720, USA. NR 0 TC 39 Z9 39 U1 0 U2 8 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD SUM PY 1992 VL 21 IS 2 BP 3 EP 13 PG 11 WC Optics SC Optics GA KX583 UT WOS:A1992KX58300001 ER PT J AU STEINMAN, AD MULHOLLAND, PJ HILL, WR AF STEINMAN, AD MULHOLLAND, PJ HILL, WR TI FUNCTIONAL-RESPONSES ASSOCIATED WITH GROWTH FORM IN STREAM ALGAE SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE PERIPHYTON; FUNCTIONAL-FORM; STREAMS; ALGAE; GRAZING; LIGHT; NUTRIENTS; PHOTOSYNTHESIS; SNAILS AB The relationship of growth form to phosphorus uptake, carbon fixation, and susceptibility to grazing was tested in stream algae, We hypothesized that algal species with high surface area: volume (SA:V) ratios would have higher biomass-specific rates of nutrient uptake and photosynthesis than species with low SA:V ratios. We also predicted that algal species with gelatinous or prostrate growth forms would have low susceptibility to grazing. Physiological measurements were made using ten taxa comprising five different algal growth forms commonly found in flowing waters (unbranched filamentous; branched filamentous; gelatinous, branched filamentous; gelatinous, colonial; and prostrate). Significant positive relationships were obtained between SA:V and phosphorus uptake, and SA:V and carbon fixation at high light (200-mu-mol quanta m-2 s-1), but only after two outlying taxa were deleted from the analysis. A significant regression was obtained between SA:V and carbon fixation at low light (20-mu-mol quanta m-2 s-1) when all ten taxa were included. Herbivore preference for different growth forms was assessed in a short-term experiment which compared the amount of algae in snail feces vs. that on substrates. The ranking for least preferred to most preferred growth form was: gelatinous (colonial) = unbranched filamentous (Oedogonium) < prostrate < unbranched filamentous (Fragilaria), The overall results are consistent with the hypothesis that the functional attributes of lotic algae are related to their growth form. However, other factors beside growth form also can influence the functional performance and, by inference, the distribution of lotic algae in nature. RP STEINMAN, AD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Mulholland, Patrick/C-3142-2012 NR 0 TC 53 Z9 55 U1 0 U2 11 PU NORTH AMER BENTHOLOGICAL SOC PI LAWRENCE PA 1041 NEW HAMSPHIRE STREET, LAWRENCE, KS 66044 SN 0887-3593 J9 J N AM BENTHOL SOC JI J. N. Am. Benthol. Soc. PD JUN PY 1992 VL 11 IS 2 BP 229 EP 243 DI 10.2307/1467388 PG 15 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA HV975 UT WOS:A1992HV97500009 ER PT J AU MUMFORD, JL LEWTAS, J WILLIAMS, K TUCKER, WG TRAYNOR, GW AF MUMFORD, JL LEWTAS, J WILLIAMS, K TUCKER, WG TRAYNOR, GW TI MUTAGENICITY OF ORGANIC EMISSIONS FROM UNVENTED KEROSENE HEATERS IN A CHAMBER STUDY SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article ID AIR POLLUTANT EMISSIONS; SPACE HEATERS; ASSAY; GAS AB A study was conducted to assess the mutagenicity of semivolatile organics and particle-bound organics emitted from unvented kerosene space heaters. The units tested included a well-tuned radiant heater and a maltuned convective heater. The tests were conducted in a 27-m3 chamber with a prescribed on/off heater usage pattern. The organic emissions were collected on Teflon-coated glass filters backed by XAD-2 resin. The dichloromethane-extractable organics from both the filters and the XAD were analyzed for nitropolycyclic hydrocarbons using gas chromatography/mass spectrometry, and were bioassayed for mutagenicity in microsuspension assays using Salmonella typhimurium strains TA98 with and without S9 and TA98NR (a nitroreductase-deficient strain) without S9. The results showed that both the semivolatile and particle-bound organics emitted from the kerosene heaters were mutagenic, and the presence of nitropolycyclic hydrocarbons in these organic emissions substantiated these findings. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MUMFORD, JL (reprint author), US EPA,RES TRIANGLE PK,NC 27711, USA. NR 18 TC 5 Z9 5 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD JUN PY 1992 VL 36 IS 2 BP 151 EP 159 PG 9 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA JA561 UT WOS:A1992JA56100004 PM 1608068 ER PT J AU CAPONETTI, E LIZZIO, A TRIOLO, R GRIFFITH, WL JOHNSON, JS AF CAPONETTI, E LIZZIO, A TRIOLO, R GRIFFITH, WL JOHNSON, JS TI ALCOHOL PARTITION IN A WATER-IN-OIL MICROEMULSION FROM SMALL-ANGLE NEUTRON-SCATTERING SO LANGMUIR LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; PERCUS-YEVICK FLUID; DISTRIBUTED DIAMETERS; POLYDISPERSE SYSTEMS; LIGHT-SCATTERING; SPHERES; TEMPERATURE; MICELLES; SIZE; HARD AB It is often necessary to add a cosurfactant, typically an alcohol of medium chain length, to water, oil, and surfactant for a microemulsion to form. To gain information on the role of alcohols, we have measured small-angle neutron scattering (SANS) from microemulsions comprised of n-hexadecane, potassium oleate, and water, plus several concentrations of 1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol, in two regions of the phase diagram. Several models, including polydisperse spheres interpreted by recently developed equations for the structure function, were tested. Experimental data could be fit successfully with the core-plus-shell monodisperse-oblate-ellipsoids model previously used for similar compositions. Variation of the alcohol chain length had little apparent effect on microemulsion structure, except in 1-pentanol systems, where high intensities at low angles are attributed to critical scattering. At fixed alcohol-to-surfactant molar ratios, particle dimensions increase with alcohol chain length in both regions of the phase diagrams. For a given alcohol, increasing the alcohol-to-surfactant molar ratio decreases particle dimensions. The water phase volume can reasonably be assumed constant, and estimates of the amount of alcohol at the water-surfactant interface were made from the parameters obtained from the fits. At fixed alcohol-to-surfactant molar ratios, we found a lower fraction of larger alcohols at the interface, in agreement with the increase of hydrophobicity. For a given alcohol, increasing the alcohol-to-surfactant ratio increased the amount of alcohol at the interface, although the fraction of total alcohol in the particle decreases. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CAPONETTI, E (reprint author), DIPARTIMENTO CHIM FIS,VIA ARCHIRAFI 26,I-90123 PALERMO,ITALY. OI CAPONETTI, Eugenio/0000-0003-0218-8556 NR 33 TC 34 Z9 34 U1 3 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1992 VL 8 IS 6 BP 1554 EP 1562 DI 10.1021/la00042a011 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JA583 UT WOS:A1992JA58300011 ER PT J AU DIACK, M GUIOCHON, G AF DIACK, M GUIOCHON, G TI ADSORPTION-ISOTHERMS AND OVERLOADED ELUTION PROFILES OF PHENYL-N-ALKANES ON POROUS CARBON IN LIQUID-CHROMATOGRAPHY SO LANGMUIR LA English DT Article ID PERFORMANCE; BAND; PROPAGATION; ADSORBENTS; SIMULATION; PACKINGS AB The adsorption isotherms of phenyltridecane, phenylundecane, phenyldecane, and phenyloctane between acetonitrile and graphitized carbon have been measured by frontal analysis. Like the isotherm of phenyldodecane previously reported, all of these isotherms exhibit two inflection points and can be empirically accounted for by the sum of a quadratic and a Langmuir term. The elution profiles of large size samples of these hydrocarbons are calculated from the experimental isotherms, using the equilibrium-dispersive model of chromatography. In spite of the complexity of the profiles, the results of the calculations are in excellent agreement with the experimental band profiles. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 30 TC 15 Z9 15 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1992 VL 8 IS 6 BP 1587 EP 1593 DI 10.1021/la00042a016 PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JA583 UT WOS:A1992JA58300016 ER PT J AU SAMANT, MG BROWN, CA GORDON, JG AF SAMANT, MG BROWN, CA GORDON, JG TI FORMATION OF AN ORDERED SELF-ASSEMBLED MONOLAYER OF DOCOSANESELENOL ON GOLD(111) - STRUCTURE BY SURFACE X-RAY-DIFFRACTION SO LANGMUIR LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; ALKYL THIOL MONOLAYERS; LANGMUIR-BLODGETT; ADSORBED FILMS; GOLD SURFACES; ELLIPSOMETRY; SPECTROSCOPY; INTERFACE; WATER AB Docosaneselenol in solution spontaneously forms an ordered (self-assembled (SA)) monolayer on the gold(111) surface. The contact wetting angle of hexadecane (53-55-degrees) on the SA monolayer coated Au surface is consistent with a surface exposing methyl groups which are at the end of the C22 chains. The in-plane structure of this SA monolayer was probed by surface X-ray diffraction. The SA monolayer forms an incommensurate structure with an oblique unit cell with a = 5.204 angstrom, b = 4.897 angstrom, and gamma = 120-degrees. The (a over arrow pointing right + b over arrow pointing right) axis is along the Au [202BAR] direction. The correlation length obtained from the radial scan was approximately 60 angstrom. The tilt angle measured from the surface normal was 15-degrees with the chains tilted along the Au [202BAR] direction (i.e. R30-degrees). The oblique structure of the unit cell represents a distorted hexagonal close packed lattice. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP SAMANT, MG (reprint author), IBM CORP,ALMADEN RES CTR,DIV RES,650 HARRY RD,SAN JOSE,CA 95120, USA. NR 24 TC 98 Z9 98 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1992 VL 8 IS 6 BP 1615 EP 1618 DI 10.1021/la00042a020 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JA583 UT WOS:A1992JA58300020 ER PT J AU OGIEVETSKY, O ZUMINO, B AF OGIEVETSKY, O ZUMINO, B TI REALITY IN THE DIFFERENTIAL-CALCULUS ON Q-EUCLIDEAN SPACES SO LETTERS IN MATHEMATICAL PHYSICS LA English DT Article AB The nonlinear reality structure of the derivatives and the differentials for the Euclidean q-spaces are found. A real Laplacian is constructed and reality properties of the exterior derivative are given. C1 LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP OGIEVETSKY, O (reprint author), MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,POB 401212,W-8000 MUNICH 40,GERMANY. RI Ogievetsky, Oleg/N-4540-2015 NR 6 TC 37 Z9 37 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0377-9017 J9 LETT MATH PHYS JI Lett. Math. Phys. PD JUN PY 1992 VL 25 IS 2 BP 121 EP 130 DI 10.1007/BF00398308 PG 10 WC Physics, Mathematical SC Physics GA JP179 UT WOS:A1992JP17900005 ER PT J AU SCHUPP, P WATTS, P ZUMINO, B AF SCHUPP, P WATTS, P ZUMINO, B TI DIFFERENTIAL GEOMETRY ON LINEAR QUANTUM GROUPS SO LETTERS IN MATHEMATICAL PHYSICS LA English DT Article ID CALCULUS AB An exterior derivative, inner derivation, and Lie derivative are introduced on the quantum group GL(q)(N). SL(q)(N) is then found by constructing matrices with determinant unity, and the induced calculus is found. C1 LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. RP SCHUPP, P (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 17 TC 67 Z9 67 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0377-9017 J9 LETT MATH PHYS JI Lett. Math. Phys. PD JUN PY 1992 VL 25 IS 2 BP 139 EP 147 DI 10.1007/BF00398310 PG 9 WC Physics, Mathematical SC Physics GA JP179 UT WOS:A1992JP17900007 ER PT J AU RATHI, AK CHURCH, RL SOLANKI, RS AF RATHI, AK CHURCH, RL SOLANKI, RS TI ALLOCATING RESOURCES TO SUPPORT A MULTICOMMODITY FLOW WITH TIME WINDOWS SO LOGISTICS AND TRANSPORTATION REVIEW LA English DT Article AB This paper presents mathematical models for a macro level analysis of a supply logistics problem. The problem involves the allocation of a limited number of transport resources (assets) towards the shipment of cargo and personnel (movement requirements) between many origins and destinations within prescribed time windows. The problem has been modeled by three linear programming formulations which can be solved in a personal computer environment in a timely manner. The first and second formulations represent an explicit statement of the problem. These formulations attempt to minimize the amount of cargo which is delivered late by determining the most appropriate assets to be allocated to movement requirements in each time period. A much smaller statement of the problem is achieved in the third formulation by assuming that lateness is distributed evenly over all routes. Thus, the formulations offer a tradeoff between the degree of control to be exercised by the planner and the speed of computation. The paper presents the basic structure of these formulations along with some test results. RP RATHI, AK (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37830, USA. NR 0 TC 8 Z9 9 U1 0 U2 1 PU UNIV BRITISH COLUMBIA PI VANCOUVER PA LOGISTICS & TRANSPORT REVIEW, VANCOUVER BC V6T 1W5, CANADA SN 0047-4991 J9 LOGIST TRANSPORT REV JI Logist. Transp. Rev. PD JUN PY 1992 VL 28 IS 2 BP 167 EP 188 PG 22 WC Operations Research & Management Science; Transportation SC Operations Research & Management Science; Transportation GA JF262 UT WOS:A1992JF26200003 ER PT J AU FERNANDO, JA CHAWLA, KK FERBER, MK COFFEY, D AF FERNANDO, JA CHAWLA, KK FERBER, MK COFFEY, D TI EFFECT OF BORON-NITRIDE COATING ON THE TENSILE-STRENGTH OF NEXTEL-480(TM) FIBER SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB The effect of a boron nitride (BN) coating 0.2-mu-m thick on the tensile strength of Nextel 480 (trade mark of the 3M Company) fiber was investigated. Nextel 480 fiber has an oval cross-section corresponding to a 10.65-mu-m equivalent diameter. It is essentially a mullite fiber with a chemical composition of 70 wt.% Al2O3, 28 wt.% SiO2 and 2 wt.% B2O3. Statistical analysis of the single fiber tensile strength was done on 50 fibers of both the uncoated and the coated type using a two-parameter Weibull distribution. The mean tensile strength of the BN-coated fiber was 2905 MPa while that of the uncoated fiber was 1766 MPa. Such an increase in the mean tensile strength of the BN-coated fiber was attributed to the surface healing effect of the BN coating. The high temperature chemical vapor deposition process used to coat the fiber with BN will result in thermal stresses. The thermal stresses, calculated using a two-element cylindrical model, showed that the radial stress at the fiber-coating interface was insignificantly small. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP FERNANDO, JA (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT CORP RES,SOCORRO,NM 87801, USA. NR 14 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUN 1 PY 1992 VL 154 IS 1 BP 103 EP 108 DI 10.1016/0921-5093(92)90369-C PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA121 UT WOS:A1992JA12100014 ER PT J AU KEEN, GM REDGRAVE, GW LAWTON, JR CINKOSKY, MJ MISHRA, SK FICKETT, JW BURKS, C AF KEEN, GM REDGRAVE, GW LAWTON, JR CINKOSKY, MJ MISHRA, SK FICKETT, JW BURKS, C TI ACCESS TO MOLECULAR-BIOLOGY DATABASES SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB The LiMB database was created to catalogue and begin coordinating access to the rapidly proliferating databases relevant to molecular biology. LiMB contains information about these databases and is currently implemented in a relational database management system that allows for complex, multiconditional queries. We present an over-view of LiMB, a description of its current implementation, and a discussion of the role of LiMB in developing strategies for automated access to distributed, heterogeneous databases. C1 WASHINGTON UNIV,SCH MED,DEPT GENET,ST LOUIS,MO 63110. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP KEEN, GM (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GP,T-10,MS K710,LOS ALAMOS,NM 87545, USA. OI Redgrave, Graham/0000-0001-6854-9268 NR 12 TC 15 Z9 15 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD JUN-JUL PY 1992 VL 16 IS 6-7 BP 93 EP 101 DI 10.1016/0895-7177(92)90154-D PG 9 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA JA602 UT WOS:A1992JA60200008 ER PT J AU LI, J AF LI, J TI PERIODIC-SOLUTIONS OF POPULATION-MODELS IN A PERIODICALLY FLUCTUATING ENVIRONMENT SO MATHEMATICAL BIOSCIENCES LA English DT Article AB A periodically fluctuating environment is assumed in a population-modeling process that generates nonautonomous difference equations. The existence and uniqueness of periodic solutions are studied. A sufficient condition for existence and a necessary condition for uniqueness are obtained. Stability of the periodic solutions is investigated. Several numerical examPles are given to illustrate the basic results, and a brief discussion is presented. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,DIV THEORET,LOS ALAMOS,NM 87545. RP LI, J (reprint author), UNIV ALABAMA,DEPT MATH SCI,HUNTSVILLE,AL 35899, USA. NR 18 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0025-5564 J9 MATH BIOSCI JI Math. Biosci. PD JUN PY 1992 VL 110 IS 1 BP 17 EP 25 DI 10.1016/0025-5564(92)90012-L PG 9 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA HX353 UT WOS:A1992HX35300002 PM 1623295 ER PT J AU JANKOWSKI, AF AF JANKOWSKI, AF TI THE ATOMIC ARRANGEMENT OF INTERSTITIALS IN MOLYBDENUM ORDERED SOLUTIONS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB The concentration wave approach is used to predict the atomic arrangement of both octahedral and tetrahedral interstitials in molybdenum ordered solutions. A comparison of the predicted ordered phases with experimental studies shows good agreement in the molybdenum-oxide and -carbide systems. RP JANKOWSKI, AF (reprint author), LAWRENCE LIVERMORE NATL LAB,MET PROC DEPOSIT GRP,LIVERMORE,CA 94550, USA. NR 27 TC 2 Z9 2 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD JUN PY 1992 VL 23 IS 6 BP 1601 EP 1606 DI 10.1007/BF02804355 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA HW874 UT WOS:A1992HW87400001 ER PT J AU CHOO, RTC SZEKELY, J DAVID, SA AF CHOO, RTC SZEKELY, J DAVID, SA TI ON THE CALCULATION OF THE FREE-SURFACE TEMPERATURE OF GAS-TUNGSTEN-ARC WELD POOLS FROM 1ST PRINCIPLES .2. MODELING THE WELD POOL AND COMPARISON WITH EXPERIMENTS SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article ID TYPE-304 STAINLESS-STEEL; GTA; GEOMETRY; METAL AB By combining a mathematical model of the welding arc and of the weld pool, calculations are presented to describe the free surface temperature of weld pools for spot welding operations. The novel aspects of the treatment include the calculation of the heat and current fluxes falling on the free weld pool surface from first principles, a realistic allowance for heat losses due to vaporization, and a realistic allowance for the temperature dependence of the surface tension. The most important finding reported in this article is that the free surface temperature of weld pools appears to be limited by Marangoni convection, rather than heat losses due to vaporization. Furthermore. it was found that once thermocapillary flow can produce high enough surface velocities (> 25 cm/s), the precise nature of the relationship between temperature and surface tension will become less important. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. RP CHOO, RTC (reprint author), UNIV TORONTO,DEPT MET & MAT SCI,TORONTO M5S 1A4,ONTARIO,CANADA. NR 27 TC 70 Z9 79 U1 1 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD JUN PY 1992 VL 23 IS 3 BP 371 EP 384 DI 10.1007/BF02656292 PG 14 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA HW877 UT WOS:A1992HW87700014 ER PT J AU HOANG, P HANH, KP AF HOANG, P HANH, KP TI MEAN-LIFE OF K-TO-L-OUT-OF-N SYSTEMS WITH NONIDENTICAL WEIBULL DISTRIBUTION COMPONENTS SO MICROELECTRONICS AND RELIABILITY LA English DT Article AB A k-to-1-out-of-n system is a noncoherent system in which no fewer than k and no more than 1 out of n units are to function for the successful operation of the system. Examples of noncoherent systems are found in communication, multiprocessor and transportation systems. A noncoherent system is very general and includes the parallel, series and N-Modular Redundancy (NMR) systems as special cases. In this paper presents the formulas for calculating the reliability and the mean life of a k-to-1-out-of-n system with non-identical weibull distribution components. RP HOANG, P (reprint author), EG&G IDAHO INC,NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 8 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 0026-2714 J9 MICROELECTRON RELIAB JI Microelectron. Reliab. PD JUN PY 1992 VL 32 IS 6 BP 845 EP 850 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HT494 UT WOS:A1992HT49400014 ER PT J AU ALLEN, RW WHEELOCK, TD AF ALLEN, RW WHEELOCK, TD TI EFFECT OF PREPARATION TECHNIQUES ON KINETICS OF OIL AGGLOMERATION OF FINE COAL SO MINERALS ENGINEERING LA English DT Article DE COAL; OIL AGGLOMERATION; KINETICS; GRINDING METHOD; DEGASSING ID FLOWING SUSPENSIONS AB The present study was carried out to establish whether the air adsorbed on fresh coal particle surfaces created by dry grinding affects the subsequent agglomeration of an aqueous suspension of the particles with oil. The agglomeration response of coal suspensions which had been degassed by applying a moderate vacuum were compared to those which had not been degassed. Aqueous suspensions of No. 2 Gas Seam coal from Raleigh County, West Virginia, were agglomerated with hexadecane in a closed mixing system. A photometric dispersion analyzer was used to monitor the turbidity of a suspension undergoing agglomeration. The behavior of both wet- and dry-ground samples was established in a series of runs made with oil dosages ranging from 1 to 33 v/w%. The presence of an air film on highly hydrophobic coal particles appeared to increase both the initial rate and final extent of agglomeration by making it easier for the oil to wet the coal particle surface and by reducing the amount of oil required to bond the agglomerates. The effects were particularly pronounced when low oil dosages were used. The presence of an air film was significant only for dry-ground coal. Since different results were achieved with wet-ground coal and dry-ground coal which had been degassed, it does not seem possible to simulate wet grinding by degassing dry-ground coal prior to agglomeration. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. RP ALLEN, RW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 13 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0892-6875 J9 MINER ENG JI Miner. Eng. PD JUN PY 1992 VL 5 IS 6 BP 649 EP 660 DI 10.1016/0892-6875(92)90060-M PG 12 WC Engineering, Chemical; Mineralogy; Mining & Mineral Processing SC Engineering; Mineralogy; Mining & Mineral Processing GA HM496 UT WOS:A1992HM49600004 ER PT J AU SCHMIDHAUSER, C CASPERSON, GF MYERS, CA SANZO, KT BOLTEN, S BISSELL, MJ AF SCHMIDHAUSER, C CASPERSON, GF MYERS, CA SANZO, KT BOLTEN, S BISSELL, MJ TI A NOVEL TRANSCRIPTIONAL ENHANCER IS INVOLVED IN THE PROLACTIN AND EXTRACELLULAR MATRIX-DEPENDENT REGULATION OF BETA-CASEIN GENE-EXPRESSION SO MOLECULAR BIOLOGY OF THE CELL LA English DT Article ID MAMMARY EPITHELIAL-CELLS; RECONSTITUTED BASEMENT-MEMBRANE; EPIDERMAL GROWTH-FACTOR; FUNCTIONAL-DIFFERENTIATION; MOLECULAR-CLONING; CULTURES; COMPONENTS; LINE; MORPHOGENESIS; HEPATOCYTES AB Lactogenic hormones and extracellular matrix (ECM) act synergistically to regulate beta-casein expression in culture. We have developed a functional subpopulation of the mouse mammary epithelial cell strain COMMA-1D (designated CID 9), which expresses high level of beta-casein, forms alveolar-like structures when plated onto the EHS tumor-derived matrix, and secretes beta-casein unidirectionally into a lumen. We have further shown that ECM- and prolactin-dependent regulations of beta-casein occur mainly at the transcriptional level and that 5'sequences play an important role in these regulations. To address the question of the nature of the DNA sequence requirements for such regulation, we analyzed the bovine-beta-casein gene promoter in these cells. We now have located a 160-bp transcriptional enhancer (BCE1) within the 5' flanking region of the beta-casein gene. Using functional assays, we show that BCE1 contains responsive elements for prolactin- and ECM-dependent regulation. BCE1 placed upstream of a truncated and inactive beta-casein promoter (the shortest extending from -89 to +42 bp with regard to the transcription start site) reconstitutes a promoter even more potent than the intact promoter, which contains BCE1 in its normal context more than 1.5 kb upstream. This small fusion promoter also reconstitutes the normal pattern of regulation, including a requirement for both prolactin and ECM and a synergistic action of prolactin and hydrocortisone. By replacing the milk promoter with a heterologous viral promoter, we show that BCE1 participates in the prolactin- and ECM-mediated regulation. C1 MONSANTO CORP RES AA3C,CHESTERFIELD,MO 63198. RP SCHMIDHAUSER, C (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 46 TC 159 Z9 161 U1 0 U2 0 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 JUN PY 1992 VL 3 IS 6 BP 699 EP 709 PG 11 WC Cell Biology SC Cell Biology GA JD737 UT WOS:A1992JD73700011 PM 1498370 ER PT J AU PIKE, GE AF PIKE, GE TI ISSUES IN MATERIALS MANUFACTURING SO MRS BULLETIN LA English DT Article RP PIKE, GE (reprint author), SANDIA NATL LABS,MAT & PROC SCI OPERAT OFF,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1992 VL 17 IS 6 BP 5 EP 5 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HY165 UT WOS:A1992HY16500001 ER PT J AU PICRAUX, ST CHASON, E MAYER, TM AF PICRAUX, ST CHASON, E MAYER, TM TI ION-ASSISTED SURFACE PROCESSING OF ELECTRONIC MATERIALS SO MRS BULLETIN LA English DT Article ID MOLECULAR-BEAM EPITAXY; PLASMA-ENHANCED CVD; DEPOSITION; SILICON; GROWTH; KINETICS C1 SANDIA NATL LABS,DEPT SURFACE & INTERFACE SCI,ALBUQUERQUE,NM 87185. RP PICRAUX, ST (reprint author), SANDIA NATL LABS,DEPT SEMICOND PHYS,ALBUQUERQUE,NM 87185, USA. NR 26 TC 7 Z9 7 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1992 VL 17 IS 6 BP 52 EP 57 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HY165 UT WOS:A1992HY16500011 ER PT J AU HATCH, FT KNIZE, MG MOORE, DH FELTON, JS AF HATCH, FT KNIZE, MG MOORE, DH FELTON, JS TI QUANTITATIVE CORRELATION OF MUTAGENIC AND CARCINOGENIC POTENCIES FOR HETEROCYCLIC AMINES FROM COOKED FOODS AND ADDITIONAL AROMATIC-AMINES SO MUTATION RESEARCH LA English DT Article DE LINEAR REGRESSION ANALYSIS; SALMONELLA MUTAGENICITY; RODENT TUMOR BIOASSAY; STRUCTURAL FACTORS MODULATING POTENCY; ANIMAL AND HUMAN CARCINOGENS ID NATIONAL-TOXICOLOGY-PROGRAM; GENETIC TOXICITY ASSAYS; TERM TEST INFORMATION; SALMONELLA MUTAGENICITY; COVALENT BINDING; CHEMICAL-STRUCTURE; ANIMAL BIOASSAYS; AMES TEST; CHRONOLOGICAL SUPPLEMENT; BACTERIAL MUTAGENICITY AB Aromatic amines have long been recognized as animal and human carcinogens. Recently heterocyclic aromatic amines (thermic amines) have been found in small amounts in cooked foods, primarily meats, and have proven to be potent mutagens and rodent carcinogens. Availability of quantitative databases for mutagenic potency in Salmonella and for carcinogenic potency in rodents has made possible a study of ten heterocyclic thermic amines and 24 aromatic amines. Potencies on mutagenic and carcinogenic scales were significantly correlated. By multiple linear regression analysis and multivariate analysis of variance, two descriptive structural factors were found to modulate the two modes of biological response. These factors were number of rings and methyl substitution at carbon atoms. The quantitative correlation between mutagenic and carcinogenic potencies and the modulating structural factors suggest a significant similarity of molecular mechanisms and support the utility of the short-term bacterial assay in evaluating hazard levels. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. FU NIEHS NIH HHS [222Y01-ES-10063] NR 96 TC 54 Z9 54 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD JUN PY 1992 VL 271 IS 3 BP 269 EP 287 DI 10.1016/0165-1161(92)90022-E PG 19 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JA584 UT WOS:A1992JA58400009 PM 1378200 ER PT J AU MENDELSOHN, ML AF MENDELSOHN, ML TI ANTIMUTAGENIC EFFECTS IN HUMANS SO MUTATION RESEARCH LA English DT Article; Proceedings Paper CT WORKSHOP ON ASSESSMENT OF ANTIMUTAGENICITY AND ANTICARCINOGENICITY : END-POINTS AND SYSTEMS, AT THE 3RD INTERNATIONAL CONF ON ANTIMUTAGENESIS AND ANTICARCINOGENESIS CY MAY 05-10, 1991 CL IL CIOCCO, ITALY DE SOMATIC GENE MUTATION; AGE RESPONSE; SUPPRESSOR GENES; GLYCOPHORIN-A; HEMOGLOBIN; BLOOMS SYNDROME; ATOM-BOMB SURVIVORS; CYCLOPHOSPHAMIDE; MICRONUCLEI; CHROMOSOME ABERRATIONS; FOLIC ACID DEFICIENCY; DNA ADDUCTS ID GLYCOPHORIN-A LOCUS; SOMATIC-CELL MUTATIONS; ATOMIC-BOMB SURVIVORS; MUTANT LYMPHOCYTES-T; 6-THIOGUANINE-RESISTANT LYMPHOCYTES; VARIANT ERYTHROCYTES; MOLECULAR ANALYSES; INVIVO MUTATIONS; BLOOMS SYNDROME; FREQUENCY AB The application of antimutagenicity studies to human somatic mutation is discussed, with emphasis on the potential for future studies. Five assay-gene combinations are now available for measuring human somatic mutation in lymphocytes and erythrocytes. Results with these combinations have defined the human background levels, and show clear responses of mutant frequency to a variety of mutagens. The testing of antimutagenic effects on background frequencies is feasible, but has not yet been done. The major uncertainty in such studies is the unknown age of mutant cells in the background, since only the newly forming mutants are potentially susceptible to most antimutagenic treatments. Intervention studies in the face of active mutagenicity and the use of other genotoxicity endpoints, such as chromosome aberrations, micronuclei and DNA adducts, are considered briefly. RP MENDELSOHN, ML (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,POB 5507,LIVERMORE,CA 94550, USA. NR 42 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD JUN PY 1992 VL 267 IS 2 BP 257 EP 264 DI 10.1016/0027-5107(92)90070-I PG 8 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA HZ647 UT WOS:A1992HZ64700012 PM 1376428 ER PT J AU PATEL, PI ROA, BB WELCHER, AA SCHOENERSCOTT, R TRASK, BJ PENTAO, L SNIPES, GJ GARCIA, CA FRANCKE, U SHOOTER, EM LUPSKI, JR SUTER, U AF PATEL, PI ROA, BB WELCHER, AA SCHOENERSCOTT, R TRASK, BJ PENTAO, L SNIPES, GJ GARCIA, CA FRANCKE, U SHOOTER, EM LUPSKI, JR SUTER, U TI THE GENE FOR THE PERIPHERAL MYELIN PROTEIN-PMP-22 IS A CANDIDATE FOR CHARCOT-MARIE-TOOTH DISEASE TYPE-1A SO NATURE GENETICS LA English DT Article ID HEREDITARY HYPERTROPHIC NEUROPATHY; TREMBLER MOUSE; SENSORY NEUROPATHY; MICROSCOPY; MOTOR; MICE; ACID; MAP AB Charcot-Marie-Tooth disease type 1A (CMT1A) is an autosomal dominant peripheral neuropathy associated with a large DNA duplication on the short arm of human chromosome 17. The trembler (Tr) mouse serves as a model for CMT1A because of phenotypic similarities and because the Tr locus maps to mouse chromosome 11 in a region of conserved synteny with human chromosome 17. Recently, the peripheral myelin gene Pmp-22 was found to carry a point mutation in Tr mice. We have isolated cDNA and genomic clones for human PMP-22. The gene maps to human chromosome 17p11.2-17p2, is expressed at high levels in peripheral nervous tissue and is duplicated, but not disrupted, in CMT1A patients. Thus, we suggest that a gene dosage effect involving PMP-22 is at least partially responsible for the demyelinating neuropathy seen in CMT1A. C1 BAYLOR COLL MED,CTR HUMAN GENOME,HOUSTON,TX 77030. BAYLOR COLL MED,DEPT PEDIAT,HOUSTON,TX 77030. AMGEN INC,AMGEN CTR,THOUSAND OAKS,CA 91320. STANFORD UNIV,MED CTR,SCH MED,HOWARD HUGHES MED INST,STANFORD,CA 94305. STANFORD UNIV,MED CTR,SCH MED,DEPT NEUROBIOL,STANFORD,CA 94305. STANFORD UNIV,MED CTR,SCH MED,DEPT NEUROPATHOL,STANFORD,CA 94305. STANFORD UNIV,MED CTR,SCH MED,DEPT GENET & PEDIAT,STANFORD,CA 94305. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. LOUISIANA STATE UNIV,MED CTR,DEPT NEUROL,NEW ORLEANS,LA 70112. LOUISIANA STATE UNIV,MED CTR,DEPT PATHOL,NEW ORLEANS,LA 70112. RP PATEL, PI (reprint author), BAYLOR COLL MED,INST MOLEC GENET,HOUSTON,TX 77030, USA. RI Suter, Ueli/A-1624-2010 NR 46 TC 436 Z9 438 U1 1 U2 11 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 1061-4036 J9 NAT GENET JI Nature Genet. PD JUN PY 1992 VL 1 IS 3 BP 159 EP 165 DI 10.1038/ng0692-159 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA JC982 UT WOS:A1992JC98200005 PM 1303228 ER PT J AU FISH, RH FONG, RH OBERHAUSEN, KJ KONINGS, MS VEGA, MC CHRISTOU, G VINCENT, JB BUCHANAN, RM AF FISH, RH FONG, RH OBERHAUSEN, KJ KONINGS, MS VEGA, MC CHRISTOU, G VINCENT, JB BUCHANAN, RM TI BIOMIMETIC OXIDATION STUDIES .6. SYNTHETIC AND MECHANISTIC ASPECTS OF MANGANESE CLUSTER MEDIATED ALKANE FUNCTIONALIZATION REACTIONS SO NEW JOURNAL OF CHEMISTRY LA English DT Article ID TERT-BUTYL HYDROPEROXIDE; DEPENDENT MONO-OXYGENASES; X-RAY STRUCTURE; HYDROGEN-PEROXIDE; HYDROCARBON FUNCTIONALIZATION; METHANE MONOOXYGENASE; ALKYL HYDROPEROXIDES; PORPHYRIN COMPLEXES; CARBOXYLATE COMPLEX; PHYSICAL-PROPERTIES AB Manganese clusters, [Mn2O(O2CMe)(tmima)2](ClO4)3 (tmima = tris[(1-methylimidazol-2-yl)methyl]amine), Mn3O(O2CMe)6(PY)3, [Mn3O(O2CMe)6(PY)3](ClO4), Mn4O2(O2CPh)7(bipy)2, [Mn4O2(O2CPh)7(bipy)2](ClO4), 1-5, were found to functionalize ethane, propane, cyclohexane, adamantane, and toluene to their respective alcohols, aldehydes, and ketones with monooxygen transfer reagents, t-butyl hydroperoxide (TBHP) or iodosylbenzene (IB), in the presence Of 02. Factors such as solvent, oxidant, catalyst stability, substrate, and presence Of O2 affected the oxidation reactions. For example, in acetonitrile, the complexes showed no sign of decomposition or loss of activity upon repeated additions of TBHP. However, lower mmol of product/mmol of Mn complex and complex decomposition are seen if methylene chloride is substituted as the solvent or if IB was used as the monooxygen transfer reagent. Primary kinetic isotope effects (cyclohexane/cyclohexane-d12) were determined to give values of approximately 8 and C-H selectivity studies with adamantane and toluene gave C3/C2 values of approximately 10 for the former, while the latter gave a benzaldehyde/benzyl alcohol ratio of 4 with no aromatic ring hydroxylation products, o, m, p-cresols, evident. In addition, the cyclohexane oxidation reactions were studied extensively and found to be quenched when oxygen gas was removed by an Argon gas purge, but not effected to any significant extent by the addition of a free radical inhibitor. There also is a direct Mn cluster catalyzed oxidation of alcohol to ketone or aldehyde, which is not affected by the absence of O2, The overall results imply that a putative Mn=O species is formed, via reaction of Mn complex with TBHP or IB, and homolytically abstracts hydrogen from C-H bonds of hydrocarbons to give a carbon radical and Mn-OH. The carbon radical, we speculate, is then trapped by O2 to form a alkyl hydroperoxide, which decomposes via a alkyl peroxy-Mn complex intermediate to alcohol, ketone, aldehyde, and Mn=O complex; no alkyl t-butylperoxides were detected. Furthermore, the putative Mn=O complex can oxidize the alcohol product to provide the ketone or aldehyde in an O2 independent reaction. The synthetic and mechanistic implications will be discussed. C1 INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. UNIV LOUISVILLE,DEPT CHEM,LOUISVILLE,KY 40292. RP FISH, RH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Christou, George /A-3072-2014 NR 79 TC 26 Z9 26 U1 0 U2 4 PU GAUTHIER-VILLARS PI PARIS PA S P E S-JOURNAL DEPT, 120 BD ST GERMAIN, F-75006 PARIS, FRANCE SN 1144-0546 J9 NEW J CHEM JI New J. Chem. PD JUN PY 1992 VL 16 IS 6 BP 727 EP 733 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA JP771 UT WOS:A1992JP77100012 ER PT J AU BREEDING, RJ HELTON, JC GORHAM, ED HARPER, FT AF BREEDING, RJ HELTON, JC GORHAM, ED HARPER, FT TI SUMMARY DESCRIPTION OF THE METHODS USED IN THE PROBABILISTIC RISK ASSESSMENTS FOR NUREG-1150 SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID NUCLEAR-POWER-PLANTS; SAFETY GOALS; UNCERTAINTY AB This paper summarizes the methods utilized by the staff of Sandia National Laboratories in performing four probabilistic risk assessments (PRAs) in support of NUREG-1150. The emphasis is on the "back-end" analyses, that is, the accident progression, source term, and consequence analyses. The accident progression and source term analyses performed for NUREG-1150 differ from previous analyses in several ways. Some of the features of the new analysis procedures were adopted to facilitate a comprehensive treatment of uncertainty in the complete risk analyses. The use of sampling techniques to provide quantitative estimates of the uncertainty in risk required that new approaches be developed for the accident progression and source term analyses. The uncertainties in the consequence analysis were not included in the overall uncertainty estimates in this project. The PRAs performed for NUREG-1150 also devoted a large effort to obtaining expert opinion to quantify parameters and phenomena for which there is large uncertainty and divergent opinions in the reactor safety community. C1 ARIZONA STATE UNIV,TEMPE,AZ 85287. RP BREEDING, RJ (reprint author), SANDIA NATL LABS,DIV SPECIAL PROJECTS 6411,ALBUQUERQUE,NM 87185, USA. NR 81 TC 45 Z9 45 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 1 BP 1 EP 27 DI 10.1016/0029-5493(92)90300-K PG 27 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC312 UT WOS:A1992JC31200001 ER PT J AU BREEDING, RJ HELTON, JC MURFIN, WB SMITH, LN JOHNSON, JD JOW, HN SHIVER, AW AF BREEDING, RJ HELTON, JC MURFIN, WB SMITH, LN JOHNSON, JD JOW, HN SHIVER, AW TI THE NUREG-1150 PROBABILISTIC RISK ASSESSMENT FOR THE SURRY-NUCLEAR-POWER-STATION SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper summarizes the findings of the probabilistic risk assessment for Unit 1 of the Surry Power Station performed in support of NUREG-1150. The emphasis is on the "back-end" analyses, that is, the accident progression, source term, and consequence analyses, and the risk results obtained when the results of these analyses are combined with the accident frequency analysis. The results show that the risk from internal initiators is well below the safety goals and is somewhat lower than estimated by Reactor Safety Study (RSS) over a decade ago. The risk from internal initiators is dominated by bypass accidents in the current analysis. The risk from seismic initiators is comparable to or greater than the risk from internal initiators, but still less than that estimated for internal initiators in the RSS. The uncertainty band for both types of initiators is considerably greater than that estimated in the RSS. C1 ARIZONA STATE UNIV,TEMPE,AZ 85287. SCI APPLICAT INT CORP,SAN DIEGO,CA. APPL PHYS INC,NANUET,NY. RP BREEDING, RJ (reprint author), SANDIA NATL LABS,DIV SPECIAL PROJECTS 6411,ALBUQUERQUE,NM 87185, USA. NR 17 TC 18 Z9 18 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 1 BP 29 EP 59 DI 10.1016/0029-5493(92)90301-B PG 31 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC312 UT WOS:A1992JC31200002 ER PT J AU PAYNE, AC BREEDING, RJ HELTON, JC SMITH, LN JOHNSON, JD JOW, HN SHIVER, AW AF PAYNE, AC BREEDING, RJ HELTON, JC SMITH, LN JOHNSON, JD JOW, HN SHIVER, AW TI THE NUREG-1150 PROBABILISTIC RISK ASSESSMENT FOR THE PEACH-BOTTOM-ATOMIC-POWER-STATION SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper summarizes the findings of the probabilistic risk assessment (PRA) for Unit 2 of the Peach Bottom Power Station performed in support of NUREG-1150. The emphasis is on the "back-end" analyses, that is, the accident progression, source term, and consequence analyses, and the risk results obtained when the results of these analyses are combined with the accident frequency analysis. The results show that the annual risk from internal initiators is much lower than estimated by the Reactor Safety Study (RSS) over a decade ago. The risk from fire initiators is about an order of magnitude higher than the risk from internal initiators, but is still less than the risk from internal initiators estimated by the RSS. The risk from seismic initiators at Peach Bottom is much greater than the risk from internal initiators. The uncertainty band for all types of initiators is considerably greater than that estimated in the RSS. C1 SANDIA NATL LABS,DIV SPECIAL PROJECTS 6411,ALBUQUERQUE,NM 87185. ARIZONA STATE UNIV,TEMPE,AZ 85287. SCI APPLICAT INT CORP,SAN DIEGO,CA. NR 18 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 1 BP 61 EP 94 DI 10.1016/0029-5493(92)90302-C PG 34 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC312 UT WOS:A1992JC31200003 ER PT J AU GREGORY, JJ BREEDING, RJ HELTON, JC MURFIN, WB HIGGINS, SJ SHIVER, AW AF GREGORY, JJ BREEDING, RJ HELTON, JC MURFIN, WB HIGGINS, SJ SHIVER, AW TI THE NUREG-1150 PROBABILISTIC RISK ASSESSMENT FOR THE SEQUOYAH-NUCLEAR-PLANT SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper summarizes the findings of the probabilistic risk assessment (PRA) for Unit 1 of the Sequoyah Nuclear Plant performed in support of NUREG-1150. The emphasis is on the "back-end" analyses, that is, the accident progression, source term, and consequence analyses, and the risk results obtained when the results of these analyses are combined with the accident frequency analysis. The results of this PRA indicate that the offsite risk from internal initiating events at Sequoyah are quite low with respect to the safety goals. The containment appears likely to withstand the loads that might be placed upon it if the reactor vessel fails. A good portion of the risk, in this analysis, comes from initiating events which bypass the containment. These events are estimated to have a relatively low frequency of occurrence, but their consequences are quite large. Other events that contribute to offsite risk involve early containment failures that occur during degradation of the core or near the time of vessel breach. Considerable uncertainty is associated with the risk estimates produced in this analysis. Offsite risk from external initiating events was not included in this analysis. C1 SANDIA NATL LABS,DIV SPECIAL PROJECTS 6411,ALBUQUERQUE,NM 87185. ARIZONA STATE UNIV,TEMPE,AZ 85287. NR 14 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD JUN PY 1992 VL 135 IS 1 BP 95 EP 115 DI 10.1016/0029-5493(92)90303-D PG 21 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC312 UT WOS:A1992JC31200004 ER EF