FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Draper, JV Kaber, DB Usher, JM AF Draper, JV Kaber, DB Usher, JM TI Telepresence SO HUMAN FACTORS LA English DT Article ID PERFORMANCE; EXPERIENCE; SYSTEM; DISPLAY; DESIGN AB Telepresence, the perception of presence within a physically remote or simulated site, has been identified as a design ideal for synthetic environments. However, confusion exists within the literature about the precise definition of telepresence. Furthermore, there is a need for a plausible and parsimonious model of telepresence. This paper identifies three types of telepresence extant in the literature: simple telepresence, cybernetic telepresence, and experiential telepresence. The third definition is the most interesting. This paper reviews the origins of experiential telepresence and the theoretical approaches commonly used to explain it. One can term these technological approaches, which emphasize the role of control/display technology, and psychological approaches, which identify experiential telepresence with known psychological phenomena. Finally, the paper presents and discusses an integrative approach to telepresence featuring a structured attentional resource model. Actual or potential applications of this research include the design of future human-machine interfaces for teleoperated robots and virtual reality systems. C1 Oak Ridge Natl Lab, Robot & Proc Syst Div, Oak Ridge, TN 37831 USA. RP Draper, JV (reprint author), Oak Ridge Natl Lab, Robot & Proc Syst Div, POB 2008,MS 6304, Oak Ridge, TN 37831 USA. RI Usher, John/E-7762-2013 OI Usher, John/0000-0002-4762-6989 NR 72 TC 121 Z9 121 U1 3 U2 20 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 0018-7208 EI 1547-8181 J9 HUM FACTORS JI Hum. Factors PD SEP PY 1998 VL 40 IS 3 BP 354 EP 375 DI 10.1518/001872098779591386 PG 22 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA 144CW UT WOS:000077297000002 PM 9849099 ER PT J AU Giust, GK Sigmon, TW Carey, PG Weiss, B Davis, GA AF Giust, GK Sigmon, TW Carey, PG Weiss, B Davis, GA TI Low-temperature polysilicon thin-film transistors fabricated from laser-processed sputtered-silicon films SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID POLY-SI TFTS; AMORPHOUS-SILICON; LEAKAGE CURRENT; MOSFETS; CRYSTALLIZATION AB In an effort to develop a simple low-temperature high-performance polysilicon thin-him transistor (TFT) technology, we report a fabrication process featuring laser-crystallized sputtered-silicon films. This top Al-gate coplanar TFT process subjects the substrate to a maximum temperature of 300 degrees C, and produces devices with mobilities up to 450 cm(2)/Vs, on/off current ratios greater than 10(7), without using a post-hydrogenation step. We believe these results represent the highest performance TFT's to date fabricated from sputtered silicon films. C1 Arizona State Univ, Dept Elect Engn, Tempe, AZ 85287 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Intevac, Santa Clara, CA 95054 USA. RP Giust, GK (reprint author), LSI Log, Santa Clara, CA 95054 USA. NR 12 TC 11 Z9 11 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD SEP PY 1998 VL 19 IS 9 BP 343 EP 344 DI 10.1109/55.709637 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA 113HL UT WOS:000075544800010 ER PT J AU Vay, JL AF Vay, JL TI Solution of elliptic equations without initial boundary values SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 11th Conference on the Computation of Electromagnetic Fields (COMPUMAG) CY NOV 01-03, 1997 CL RIO JANEIRO, BRAZIL SP IEEE, Univ Sao Paulo, Escola Politecn, Univ Fed Minas Gerais, Univ Fed Santa Catarina, Univ Santa Cecilia, Int Comp Soc, Soc Brasileira Elecromagnet DE boundary value problem; finite-difference methods AB A method for the numerical solution of elliptic equations is presented here, which does not require the computation of initial boundary values. This method is particularly advantageous for a multidimensional system with complex source density distribution for which the accurate computation of boundary values can be several orders of magnitude more expensive than the elliptic problem resolution itself. Associated with the newly developed 'transmitted-wave' boundary condition, ie can allow a multi-scale resolution of an elliptic equation on a system of grids having specific resolution adjusted to the variations of density, giving capabilities similar to tree codes. This elliptic solver is used in the electromagnetic PIC code BPIC3D for the computation of the initial electric and magnetic fields in simulations of beam transport in Heavy-ion Inertial Fusion. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Vay, JL (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 5 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 USA SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1998 VL 34 IS 5 BP 2517 EP 2520 DI 10.1109/20.717580 PN 1 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 120MM UT WOS:000075960200027 ER PT J AU Vay, JL AF Vay, JL TI 'Transmitted-wave' boundary condition for the wave equation multiscale computation of electromagnetic waves SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 11th Conference on the Computation of Electromagnetic Fields (COMPUMAG) CY NOV 01-03, 1997 CL RIO JANEIRO, BRAZIL SP IEEE, Univ Sao Paulo, Escola Politecn, Univ Fed Minas Gerais, Univ Fed Santa Catarina, Univ Santa Cecilia, Int Comp Soc, Soc Brasileira Elecromagnet DE electromagnetic fields; FDTD methods; propagation; adaptive systems AB We present in this paper a boundary condition solving the wave equation at the interfaces of connected grids having arbitrary resolution. This algorithm applies to the finite-difference form of the wave equation and has been developed for the computation of electromagnetic fields on a multiple spatial scale level domains. Because this algorithm is local and explicit, it allows domain decomposition with efficient scaling of run time on parallel computers. This algorithm is being implemented in the 3D electromagnetic Particle-In-Cell code BPIC3D for beam transport calculations in Heavy-Ion Inertial Fusion [1]. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Vay, JL (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1998 VL 34 IS 5 BP 2688 EP 2691 DI 10.1109/20.717623 PN 1 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 120MM UT WOS:000075960200070 ER PT J AU Turner, LR Foster, MW AF Turner, LR Foster, MW TI Modeling forces in high-temperature superconductors SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 11th Conference on the Computation of Electromagnetic Fields (COMPUMAG) CY NOV 01-03, 1997 CL RIO JANEIRO, BRAZIL SP IEEE, Univ Sao Paulo, Escola Politecn, Univ Fed Minas Gerais, Univ Fed Santa Catarina, Univ Santa Cecilia, Int Comp Soc, Soc Brasileira Elecromagnet DE electromagnetic analysis; finite element methods; high-temperature superconductors; magnetic forces; modeling; optimization methods; simulated annealing AB We have developed a simple model that uses computed shielding currents to determine the forces acting on a high-temperature superconductor (HTS), The model has been applied to measurements of the force between HTS and permanent magnets (PM). Results show the expected hysteretic variation of force as the BTS moves first toward and then away from a permanent magnet, including the reversal of the sign of the force. Optimization of the shielding currents is carried out through a simulated annealing algorithm in a C++ program that repeatedly calls a commercial electromagnetic software code, Agreement with measured forces is encouraging. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Turner, LR (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1998 VL 34 IS 5 BP 3024 EP 3027 DI 10.1109/20.717707 PN 1 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 120MM UT WOS:000075960200154 ER PT J AU Lin, YH Cunningham, GA Coggeshall, SV Jones, RD AF Lin, YH Cunningham, GA Coggeshall, SV Jones, RD TI Nonlinear system input structure identification: Two stage fuzzy curves and surfaces SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART A-SYSTEMS AND HUMANS LA English DT Article DE algorithms; finance; fuzzy systems; multidimensional estimation; nonlinear estimation; uncertain systems ID FEATURE-SELECTION; NEURAL-NETWORK; REGRESSION AB When modeling a complex, poorly defined, nonlinear problem with hundreds of possible inputs, we must identify the significant inputs before any known nonlinear modeling techniques can be applied. In this paper we introduce two stage fuzzy curves and surfaces and use them to 1) automatically and quickly order large numbers of inputs according to their significance, 2) eliminate spurious inputs, and 3) eliminate inputs dependent on the significant inputs. C1 Univ Calif Los Alamos Natl Lab, Comp & Commun Div, Los Alamos, NM 87545 USA. New Mexico Inst Min & Technol, Dept Elect Engn, Socorro, NM 87801 USA. Univ Calif Los Alamos Natl Lab, Div Appl Theoret Phys, Los Alamos, NM 87545 USA. RP Lin, YH (reprint author), Univ Calif Los Alamos Natl Lab, Comp & Commun Div, POB 1663, Los Alamos, NM 87545 USA. EM george.cunningham@nmp.nokia.com NR 23 TC 19 Z9 21 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1083-4427 J9 IEEE T SYST MAN CY A JI IEEE Trans. Syst. Man Cybern. Paart A-Syst. Hum. PD SEP PY 1998 VL 28 IS 5 BP 678 EP 684 DI 10.1109/3468.709615 PG 7 WC Computer Science, Cybernetics; Computer Science, Theory & Methods SC Computer Science GA 111FV UT WOS:000075427400011 ER PT J AU Martin, SJ Butler, MA Spates, JJ Schubert, WK Mitchell, MA AF Martin, SJ Butler, MA Spates, JJ Schubert, WK Mitchell, MA TI Magnetically-excited flexural plate wave resonator SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Article ID SENSOR AB A flexural plate wave (FPW) resonator was constructed by patterning current lines on a silicon nitride membrane suspended on a rectangular silicon frame. Eigenmodes of the rectangular membrane were excited using Lorentz forces generated between alternating surface currents and a static in-plane magnetic field. The magnetic field strength required for these devices can be achieved with small permanent magnets (approximate to 1 cm(3)). Preferential coupling to a particular membrane mode was achieved by positioning current lines along longitudinal mode antinodes, An equivalent-circuit model was derived that characterizes the input impedance of a one-port device and the transmission response of a two-port device over a range of frequencies near a single membrane resonance. Experiments were performed to characterize the effects of varying magnetic field, ambient gas, gas pressure, and input power. To our knowledge, this is the first experimental demonstration of a resonant FPW device. C1 Sandia Natl Labs, Microsensor Res & Dev Dept, Albuquerque, NM 87185 USA. Ktech Corp, Albuquerque, NM 87110 USA. RP Martin, SJ (reprint author), Sandia Natl Labs, Microsensor Res & Dev Dept, POB 5800, Albuquerque, NM 87185 USA. NR 12 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD SEP PY 1998 VL 45 IS 5 BP 1381 EP 1387 DI 10.1109/58.726465 PG 7 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA 129WX UT WOS:000076488000033 ER PT J AU Cernosek, RW Martin, SJ Hillman, AR Bandey, HL AF Cernosek, RW Martin, SJ Hillman, AR Bandey, HL TI Comparison of lumped-element and transmission-line models for thickness-shear-mode quartz resonator sensors SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Article ID MICROBALANCE; LIQUID AB Both a transmission-line model and its simpler variant, a lumped-element model, can be used to predict the responses of a thickness-shear-mode quartz resonator sensor. Relative deviations in the parameters computed by the two models (shifts in resonant frequency and motional resistance) do not exceed 3% for most practical sensor configurations operating at the fundamental resonance. If the ratio of the load surface mechanical impedance to the quartz shear characteristic impedance does not exceed 0.1, the lumped-element model always predicts responses within 1% of those for the transmission-line model. C1 Sandia Natl Labs, Microsensor Res & Dev Dept, Albuquerque, NM 87185 USA. Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England. RP Cernosek, RW (reprint author), Sandia Natl Labs, Microsensor Res & Dev Dept, POB 5800, Albuquerque, NM 87185 USA. EM rwcerno@sandia.gov NR 10 TC 72 Z9 72 U1 1 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD SEP PY 1998 VL 45 IS 5 BP 1399 EP 1407 DI 10.1109/58.726468 PG 9 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA 129WX UT WOS:000076488000036 ER PT J AU Ten Brinke, J Selvin, S Hodgson, AT Fisk, WJ Mendell, MJ Koshland, CP Daisey, JM AF Ten Brinke, J Selvin, S Hodgson, AT Fisk, WJ Mendell, MJ Koshland, CP Daisey, JM TI Development of new volatile organic compound (VOC) exposure metrics and their relationship to "sick building syndrome" symptoms SO INDOOR AIR-INTERNATIONAL JOURNAL OF INDOOR AIR QUALITY AND CLIMATE LA English DT Article DE volatile organic compounds (VOC); sick building syndrome (SBS); total volatile organic compounds (TVOC); office buildings; indoor sources ID INDOOR AIR; OFFICE BUILDINGS; EMISSIONS; MODEL; CALIFORNIA; PREVALENCE; CHAMBER; CLIMATE; PAINTS AB Occupants of office buildings are exposed to low concentrations of complex mixtures of volatile organic compounds (VOCs) that encompass a number of chemical classes and a broad range of irritancies. "Sick building syndrome" (SBS) is suspected to be related to these exposures. Using data from 22 office areas in 12 California buildings, seven VOC exposure metrics were developed and their ability to predict self-reported SBS irritant symptoms of office workers was tested. The VOC metrics were each evaluated in a multivariate logistic regression analysis model adjusted for other risk factors or confounders. Total VOCs and most of the other metrics were not statistically significant predictors of symptoms in crude or adjusted analyses. Two metrics were developed using principal components (PC) analysis on subsets of the 39 VOCs. The irritancy/PC metric was the most statistically significant predictor of adjusted irritant symptoms. The irritant potencies of individual compounds, highly correlated nature of indoor VOC mixtures, and probable presence of potent, but unmeasured, VOCs were variously factored into this metric. These results, which for the first time show a Link between low level VOC exposures from specific types of indoor sources to SBS symptoms, require confirmation using data sets from other buildings. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Indoor Environm Dept, Envrionm Energy Technol Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Sch Publ Hlth, Dept Biostat, Berkeley, CA 94720 USA. NIOSH, Industrywide Studies Branch, Cincinnati, OH 45226 USA. Univ Calif Berkeley, Sch Publ Hlth, Dept Environm Hlth Sci, Berkeley, CA 94720 USA. Univ Oxford, Dept Appl Social Studies & Social Res, Oxford OX1 2JD, England. RP Daisey, JM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Indoor Environm Dept, Envrionm Energy Technol Div, Berkeley, CA 94720 USA. NR 45 TC 51 Z9 52 U1 7 U2 25 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6947 J9 INDOOR AIR JI Indoor Air-Int. J. Indoor Air Qual. Clim. PD SEP PY 1998 VL 8 IS 3 BP 140 EP 152 PG 13 WC Construction & Building Technology; Engineering, Environmental; Public, Environmental & Occupational Health SC Construction & Building Technology; Engineering; Public, Environmental & Occupational Health GA 120DQ UT WOS:000075939900002 ER PT J AU Wooley, R Ma, Z Wang, NHL AF Wooley, R Ma, Z Wang, NHL TI A nine-zone simulating moving bed for the recovery of glucose and xylose from biomass hydrolyzate SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID CONTINUOUS CHROMATOGRAPHIC-SEPARATION; ADSORPTION; COUNTERCURRENT; DESIGN; ADSORBER; SUGAR; EQUILIBRIA; SYSTEMS AB A nine-zone simulated moving bed (SMB) process was developed to recover two sugars, glucose and xylose, from biomass hydrolyzate with 88% recovery and near 100% purity. The SMB system consists of two coupled binary SMB rings which are operated at the same switching time. The first ring consists of five zones, in which sulfuric acid (a fast-moving solute) is recovered as the raffinate product, acetic acid (a slow-moving solute) is partially recovered as the extract product, and a mixture of the two sugars (intermediate solute) and the rest of the acetic acid is recovered in a bypass stream, which is input as the feed to the second ring. The second ring consists of four zones, in which the sugars are recovered as the raffinate product and acetic acid is recovered as the extract product. Experimental SMB data obtained using either hydrolyzate or synthetic mixtures of glucose, xylose, sulfuric acid, and acetic acid are presented and analyzed with a lumped mass-transfer model. Single-component and multicomponent pulse tests were used to estimate adsorption and mass-transfer parameters of the four key components present in the hydrolyzate. Simulations based on the estimated parameters were compared with experimental data. Excellent agreement between simulations and experimental data was obtained, indicating that optimization of such a system with a complex feed and more than 19 design parameters can be facilitated with computer simulations. C1 Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Wang, NHL (reprint author), Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA. EM rwooley@nrel.gov; zidu@ecn.purdue.edu; wangn@ecn.purdue.edu NR 36 TC 92 Z9 97 U1 5 U2 25 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD SEP PY 1998 VL 37 IS 9 BP 3699 EP 3709 DI 10.1021/ie9800896 PG 11 WC Engineering, Chemical SC Engineering GA 119DR UT WOS:000075881000022 ER PT J AU Mitchell, JN Snyder, GA Taylor, LA AF Mitchell, JN Snyder, GA Taylor, LA TI Mineral-chemical and isotopic variations in Apollo 16 impact-melt breccias SO INTERNATIONAL GEOLOGY REVIEW LA English DT Article ID EARLY LUNAR; RB-SR; MOON; ROCKS; HIGHLANDS; AGE; PETROGENESIS; BOMBARDMENT; CHRONOLOGY; EVOLUTION AB Lunar impact-melt breccias were formed by intense bombardment of the Moon's surface by meteorites. The compositions of these rocks may record the composition of the underlying lunar crust, but also may contain components that were transported from much larger basin-forming impacts several hundred kilometers away. In this study, a suite of nine impact-melt breccia samples were analyzed for their texture and mineral compositions and a subset of these samples were analyzed for Sr- and Nd-isotopic compositions. These new data were integrated into accumulated databases on the mineral-chemical and geochemical compositions of Apollo 16 impact-melt breccias to develop a better understanding of the formation of these rocks and the nature of the materials from which they were derived. Although not pronounced, there are some distinct mineralogical features characteristic of the various breccia groups and subgroups defined in McKinley et al. (1984) and Korotev (1994). Rocks in the various subgroups have isotopic characteristics that are correlated with the geochemical features used to classify them. Mineralogical and chemical features of Group 3 and Group 4 breccias (feldspathic) are clearly inherited from their anorthositic source. The large compositional variation in Group 3 and Group 4 breccias (mafic) is more complicated, requiring a significantly more mafic and incompatible trace element-rich source than anorthosite. Although rocks of the magnesian and alkali suites have these compositional characteristics, the amount of added material required to shift the compositions of feldspathic breccias to mafic breccias is prohibitive. The mafic impact-melt breccias are interpreted to have been emplaced as a result of the Imbrium impact, and thus contain a record of the composition of the middle to lower crust in the Imbrium region. Compositional similarities between Group 1 breccias and Apollo 15 KREEP basalts suggest that these two rocks may ultimately have the same source region. C1 Univ Tennessee, Dept Geol Sci, Planetary Geosci Inst, Knoxville, TN 37996 USA. RP Mitchell, JN (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Mail Stop K752, Los Alamos, NM 87545 USA. NR 63 TC 0 Z9 0 U1 1 U2 1 PU V H WINSTON & SON INC PI PALM BEACH PA 360 SOUTH OCEAN BLVD, PH-B, PALM BEACH, FL 33480 USA SN 0020-6814 J9 INT GEOL REV JI Int. Geol. Rev. PD SEP PY 1998 VL 40 IS 9 BP 784 EP 804 PG 21 WC Geology SC Geology GA 137UC UT WOS:000076933900004 ER PT J AU Peterson, TC Vose, R Schmoyer, R Razuvaev, V AF Peterson, TC Vose, R Schmoyer, R Razuvaev, V TI Global historical climatology network (GHCN) quality control of monthly temperature data SO INTERNATIONAL JOURNAL OF CLIMATOLOGY LA English DT Article DE global historical climatology network (GHCN); quality control; temperature; monthly; homogeneity tests; outliers ID SERIES AB All geophysical data bases need some form of quality assurance. Otherwise, erroneous data points may produce faulty analyses. However, simplistic quality control procedures have been known to contribute to erroneous conclusions by removing valid data points that were more extreme than the data set compilers expected. In producing version 2 of the global historical climatology network's (GHCN's) temperature data sets, a variety of quality control tests were evaluated and a specialized suite of procedures was developed. Quality control traditionally relies primarily on checks for outliers from both a time series and spatial perspective, the latter accomplished by comparisons with neighbouring stations. This traditional approach was used, and it was determined that there are many data problems that require additional tests to detect. In this paper a suite of quality control tests are justified and documented and applied to this global temperature data base, emphasizing the logic and limitations of each test. (C) 1998 Royal Meteorological Society. C1 NOAA, Natl Climat Data Ctr, Asheville, NC 28801 USA. Arizona State Univ, Tempe, AZ 85287 USA. DOE, Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Res Inst Hydrometeorol Informat, Obninsk, Russia. RP Peterson, TC (reprint author), NOAA, Natl Climat Data Ctr, 151 Patton Ave,Room 120, Asheville, NC 28801 USA. EM tpeterso@ncdc.noaa.gov NR 21 TC 126 Z9 140 U1 2 U2 12 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0899-8418 J9 INT J CLIMATOL JI Int. J. Climatol. PD SEP PY 1998 VL 18 IS 11 BP 1169 EP 1179 DI 10.1002/(SICI)1097-0088(199809)18:11<1169::AID-JOC309>3.0.CO;2-U PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 122XV UT WOS:000076097500001 ER PT J AU Glatzmaier, GA Roberts, PH AF Glatzmaier, GA Roberts, PH TI Dynamo theory then and now SO INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE LA English DT Article ID ROTATING SPHERICAL-SHELL; STELLAR CONVECTIVE DYNAMOS; EARTHS INNER-CORE; NUMERICAL SIMULATIONS; DIFFERENTIAL ROTATION; COMPUTER-SIMULATION; KINEMATIC DYNAMOS; MAGNETIC-FIELD; DRIVEN; GEODYNAMO AB A brief history of dynamo theory is presented, from its earliest beginnings, through the development of successful kinematic models (those in which only the electrodynamic equations are solved), up to the present time when fully magnetohydrodynamic simulations have successfully reproduced the main features of the Earth's magnetic field. A particular focus of this paper is the role of the solid inner core of the Earth on the dynamics of its fluid core. Some new results are presented concerning the age and topography of the inner core. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Los Angeles, Los Angeles, CA 90095 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 89 TC 9 Z9 9 U1 3 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0020-7225 EI 1879-2197 J9 INT J ENG SCI JI Int. J. Eng. Sci. PD SEP-NOV PY 1998 VL 36 IS 12-14 BP 1325 EP 1338 DI 10.1016/S0020-7225(98)00035-4 PG 14 WC Engineering, Multidisciplinary SC Engineering GA 148ZT UT WOS:000077581800003 ER PT J AU Ecke, RE Liu, YM AF Ecke, RE Liu, YM TI Traveling-wave and vortex states in rotating Rayleigh-Benard convection SO INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE LA English DT Article; Proceedings Paper CT Chandrasekhar Memorial Symposium of the Society-of-Engineering-Science CY OCT 21-23, 1996 CL ARIZONA STATE UNIV, TEMPE, ARIZONA HO ARIZONA STATE UNIV DE convection; pattern formation; vortices ID HEAT-TRANSFER; ASYMMETRIC MODES; PRANDTL NUMBERS; STABILITY; CRYOGENS; LIQUID-HE-4; ONSET AB Experimental results on states of rotating Rayleigh-Benard convection in water with a Prandtl number of 6.4 are presented. Using precision heat transport measurements and optical shadowgraph imaging, we have explored the sidewall traveling-wave state in cylindrical convection cells with radius-to-height ratios Gamma = 1, 2.5, and 5. The critical Rayleigh number and precession frequencies for the wall mode were measured as a function of a dimensionless rotation rate and are compared to theoretical predictions. The onset of bulk convection and its pattern wave number are found to agree quite closely with predictions of Chandrasekhar's linear stability analysis. Vortex states at higher Rayleigh number are also described and characteristics of the thermal vortices including the vortex circulation and the frequency of collective vortex motions are presented. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Condensed Matter & Thermal Phys Grp, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Ecke, RE (reprint author), Univ Calif Los Alamos Natl Lab, Condensed Matter & Thermal Phys Grp, POB 1663, Los Alamos, NM 87545 USA. OI Ecke, Robert/0000-0001-7772-5876 NR 21 TC 8 Z9 8 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0020-7225 J9 INT J ENG SCI JI Int. J. Eng. Sci. PD SEP-NOV PY 1998 VL 36 IS 12-14 BP 1471 EP 1480 DI 10.1016/S0020-7225(98)00043-3 PG 10 WC Engineering, Multidisciplinary SC Engineering GA 148ZT UT WOS:000077581800011 ER PT J AU Mackay, D Mahinthakumar, G D'Azevedo, E AF Mackay, D Mahinthakumar, G D'Azevedo, E TI A study of I/O in a parallel finite element groundwater transport code SO INTERNATIONAL JOURNAL OF HIGH PERFORMANCE COMPUTING APPLICATIONS LA English DT Article AB A parallel finite element groundwater transport code is used to compare three different strategies for performing parallel I/O: (1) have a single processor collect data and perform sequential I/O in large blocks, (2) use variations of vendor-specific I/O extensions, or (3) use the extended distributed object network I/O (EDONIO) library. Each processor performs many writes of 1 to 4 kilobytes to reorganize local data in a global shared file. The findings suggest having a single processor collect data and perform large block-contiguous operations may be quite efficient and portable for up to 32 processor configurations. This approach does not scale well for a larger number of processors because the single processor becomes a bottleneck for gathering data. The effective application I/O rate observed, which includes times for opening and closing files, is only a fraction of the peak device read/write rates. Some form of data redistribution and buffering in remote memory as performed in EDONIO may yield significant improvements for noncontiguous data I/O access patterns and short requests. Implementers of parallel I/O systems may consider some form of buffering as performed in EDONIO to speed up such I/O requirements. C1 Intel Corp, Hillsboro, OR 97124 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Mackay, D (reprint author), Intel Corp, Hillsboro, OR 97124 USA. EM David_R_Mackay@ccm.hf.intel.com NR 8 TC 3 Z9 4 U1 1 U2 1 PU SAGE PUBLICATIONS LTD PI LONDON PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND SN 1094-3420 J9 INT J HIGH PERFORM C JI Int. J. High Perform. Comput. Appl. PD FAL PY 1998 VL 12 IS 3 BP 307 EP 319 DI 10.1177/109434209801200301 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA 111ZB UT WOS:000075467800001 ER PT J AU Oldfield, RA Womble, DE Ober, CC AF Oldfield, RA Womble, DE Ober, CC TI Efficient parallel I/O in seismic imaging SO INTERNATIONAL JOURNAL OF HIGH PERFORMANCE COMPUTING APPLICATIONS LA English DT Article AB Although high performance computers tend to be measured by their processor and communication speeds, the bottleneck for many large-scale applications is the I/O performance rather than the computational or communication performance. One such application is the processing of three-dimensional seismic data. Seismic data sets, consisting of recorded pressure waves, can be very large, sometimes more than a terabyte in size. Even if the computations can be performed in core, the time required to read the initial seismic data and velocity model and write images is substantial. In this paper, the authors discuss an approach in handling the massive I/O requirements of seismic processing and show the performance of their imaging code (Salvo) on the Intel Paragon(TM) computer. C1 Dartmouth Coll, Dept Comp Sci, Hanover, NH 03755 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Oldfield, RA (reprint author), Dartmouth Coll, Dept Comp Sci, Hanover, NH 03755 USA. NR 9 TC 13 Z9 14 U1 2 U2 2 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 1094-3420 J9 INT J HIGH PERFORM C JI Int. J. High Perform. Comput. Appl. PD FAL PY 1998 VL 12 IS 3 BP 333 EP 344 DI 10.1177/109434209801200303 PG 12 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA 111ZB UT WOS:000075467800003 ER PT J AU Nieplocha, J Foster, I Kendall, RA AF Nieplocha, J Foster, I Kendall, RA TI ChemIO: High performance parallel I/O for computational chemistry applications SO INTERNATIONAL JOURNAL OF HIGH PERFORMANCE COMPUTING APPLICATIONS LA English DT Article ID ELECTRONIC-STRUCTURE; SCF; COMPUTERS AB Recent developments in I/O systems on scalable parallel computers have sparked renewed interest in out-of-core methods for computational chemistry. These methods can improve execution time significantly relative to direct methods, which perform many redundant computations. However, the widespread use of such out-of-core methods requires efficient and portable implementations of often complex I/O patterns. The ChemIO project has addressed this problem by defining an I/O interface that captures the I/O patterns found in important computational chemistry applications and by providing high performance implementations of this interface on multiple platforms. This development broadens the user community for parallel I/O techniques and provides new insights into the functionality required in general purpose scalable I/O libraries and the techniques required to achieve high performance I/O on scalable parallel computers. C1 Pacific NW Lab, Richland, WA 99352 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Nieplocha, J (reprint author), Pacific NW Lab, POB 999,MSIN-K1087, Richland, WA 99352 USA. EM j_nieplocha@pnl.gov NR 29 TC 12 Z9 13 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 1094-3420 J9 INT J HIGH PERFORM C JI Int. J. High Perform. Comput. Appl. PD FAL PY 1998 VL 12 IS 3 BP 345 EP 363 DI 10.1177/109434209801200304 PG 19 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA 111ZB UT WOS:000075467800004 ER PT J AU Murty, KL Mathew, MD Wang, Y Shah, VN Haggag, FM AF Murty, KL Mathew, MD Wang, Y Shah, VN Haggag, FM TI Nondestructive determination of tensile properties and fracture toughness of cold worked A36 steel SO INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING LA English DT Article DE cold worked A36 steel; fracture toughness; tensile properties; ball indentation ID INDENTATION AB Tensile and fracture properties of ASTM grade A36 steel have been studied using nondestructive Stress-Strain Microprobe(TM) system (SSM), which is developed on the basis of automated ball indentation (ABI) technique. Tests have been carried out on as-received, and cold worked (4, 8 and 12%) materials at several temperatures in the range - 150 degrees C- + 200 degrees C at a constant strain rate. Tensile properties determined from ABI tests agreed well with the results from conventional tensile tests. The elastic-plastic fracture toughness parameter K-JC was estimated from the ABI data. As expected, cold working resulted in increase in strength, decrease in fracture toughness and increase in ductile to brittle transition temperature. ABI is a reliable nondestructive technique for determining tensile and fracture properties of materials and has potential applications in the nuclear industry particularly to determine toughness degradation due to aging in service. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 N Carolina State Univ, Raleigh, NC 27695 USA. Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. Adv Technol Corp, Oak Ridge, TN 37830 USA. RP Mathew, MD (reprint author), N Carolina State Univ, Raleigh, NC 27695 USA. NR 16 TC 54 Z9 55 U1 4 U2 9 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0308-0161 J9 INT J PRES VES PIP JI Int. J. Pressure Vessels Pip. PD SEP PY 1998 VL 75 IS 11 BP 831 EP 840 DI 10.1016/S0308-0161(98)00093-3 PG 10 WC Engineering, Multidisciplinary; Engineering, Mechanical SC Engineering GA 146EK UT WOS:000077414900006 ER PT J AU Robinson, CP Woodard, JB Varnado, SG AF Robinson, CP Woodard, JB Varnado, SG TI Critical infrastructure: Interlinked and vulnerable SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Article C1 Sandia Natl Labs, Energy Informat & Infrastruct Technol Div, Livermore, CA 94550 USA. Sandia Natl Labs, Energy & Crit Informat Technol Ctr, Livermore, CA 94550 USA. RP Robinson, CP (reprint author), Sandia Natl Labs, Energy Informat & Infrastruct Technol Div, Livermore, CA 94550 USA. NR 0 TC 4 Z9 5 U1 1 U2 6 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD FAL PY 1998 VL 15 IS 1 BP 61 EP 67 PG 7 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA 128YY UT WOS:000076437000033 ER PT J AU Hartman, AD Gerdemann, SJ Hansen, JS AF Hartman, AD Gerdemann, SJ Hansen, JS TI Producing lower-cost titanium for automotive applications SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Although titanium has attractive properties that can improve the performance and economy of automobiles, at its current cost, it cannot compete with steel in most applications for which it is suited. It is readily apparent that titanium cannot be considered a viable mass-market automotive materials alternative as long as it is produced with the Kroll process. A look at existing and new technologies (as well as some that have been found lacking) in terms of applicability toward high-volume, low-cost titanium production for automotive applications indicates other options. C1 US Bur Mines, Albany Res Ctr, Dept Energy, Thermal Treatment Technol Div, Albany, OR 97321 USA. RP Hartman, AD (reprint author), US Bur Mines, Albany Res Ctr, Dept Energy, Thermal Treatment Technol Div, 1450 SW Queen Ave, Albany, OR 97321 USA. NR 20 TC 38 Z9 42 U1 1 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD SEP PY 1998 VL 50 IS 9 BP 16 EP 19 DI 10.1007/s11837-998-0408-1 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA 119GP UT WOS:000075887800002 ER PT J AU Prentice, GA Chen, KS AF Prentice, GA Chen, KS TI Effects of current density on adhesion of copper electrodeposits to polyimide substrates SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article DE plating; plastic; copper; polyimide; current density; adhesion ID BOND AB To provide protection, electrical conductivity, or a decorative finish, plastic components are often metallized by a three-step process: deposition of a catalytic palladium-layer followed by electroless and electrolytic plating. In this paper we focused on determining the relationship between applied current density used to electrodeposit copper and adhesion of the metal to a polyimide substrate. To test a range of current densities on a single sample, we deposited a series of copper strips on a planar sheet of the polyimide material and electrodeposited copper in a modified Hull cell. From peel tests we found that strips subjected to higher current density adhered more strongly to the substrate. This experimental procedure should be generally applicable to other metal-polymer systems. C1 Univ Detroit Mercy, Dept Chem Engn, Detroit, MI 48219 USA. Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87185 USA. RP Prentice, GA (reprint author), Univ Detroit Mercy, Dept Chem Engn, Detroit, MI 48219 USA. NR 11 TC 5 Z9 5 U1 1 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD SEP PY 1998 VL 28 IS 9 BP 971 EP 977 DI 10.1023/A:1003437616899 PG 7 WC Electrochemistry SC Electrochemistry GA 148FH UT WOS:000077493800015 ER PT J AU Horn, KM Swartzentruber, BS Osbourn, GC Bouchard, A Bartholomew, JW AF Horn, KM Swartzentruber, BS Osbourn, GC Bouchard, A Bartholomew, JW TI Electronic structure classifications using scanning tunneling microscopy conductance imaging SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SI(111)2X1 SURFACE AB The electronic structure of atomic surfaces is imaged by applying multivariate image classification techniques to multibias conductance data measured using scanning tunneling microscopy. Image pixels are grouped into classes according to shared conductance characteristics. The image pixels, when color coded by class, produce an image that chemically distinguishes surface electronic features over the entire area of a multibias conductance image. Such "classed" images reveal surface features not always evident in a topograph. This article describes the experimental technique used to record multibias conductance images, how image pixels are grouped in a mathematical, classification space, how a computed grouping algorithm can be employed to group pixels with similar conductance characteristics in any number of dimensions, and finally how the quality of the resulting classed images can be evaluated using a computed, combinatorial analysis of the full dimensional space in which the classification is performed. (C) 1998 American Institute of Physics. [S0021-8979(98)01917-3]. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Horn, KM (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 10 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1998 VL 84 IS 5 BP 2487 EP 2496 DI 10.1063/1.368409 PG 10 WC Physics, Applied SC Physics GA 114CC UT WOS:000075590700017 ER PT J AU Johnson, JN Dick, JJ Hixson, RS AF Johnson, JN Dick, JJ Hixson, RS TI Transient impact response of three polymers SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SHOCK; RELEASE AB Experimental data are presented for the transient response of three polymers, Estane, Estane with a nitro-plasticizer, and adiprene, subject to flat-plate impact. These data are analyzed in terms of a generalized Maxwell model and the theory of characteristics for the dynamical motion. Comparison of theory and experiment quantifies the high-frequency component in the Maxwell description; for Adiprene the high-frequency shear modulus and relaxation time are 300 MPa and approximately 50 ns, respectively. For estane the corresponding quantities are 300 MPa and approximately 200 ns. Low-pressure Hugoniot data are also presented for estane. An estimate of the low-pressure Hugoniot is given for Adiprene. Some experimental data are also presented for the Estane/nitro-plasticizer combination; this material is used as a binder in plastic-bonded explosives. Theory is presented for a thermodynamically consistent calculation of temperature in high-rate loading of polymers whose mechanical properties are represented by a generalized Maxwell model. (C) 1998 American Institute of Physics. [S0021-8979(98)07917-1]. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Johnson, JN (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 15 TC 25 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1998 VL 84 IS 5 BP 2520 EP 2529 DI 10.1063/1.368413 PG 10 WC Physics, Applied SC Physics GA 114CC UT WOS:000075590700022 ER PT J AU Samara, GA AF Samara, GA TI Pressure as a probe of the glassy properties of compositionally disordered soft mode ferroelectrics: (Pb0.82La0.12)(Zr0.40Ti0.60)O-3 (PLZT 12/40/60) SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIELECTRIC-PROPERTIES; RELAXATION; BEHAVIOR; CERAMICS AB It is shown that hydrostatic pressure qualitatively changes the dielectric response of a lanthanum-modified, lead zirconate-titanate (PLZT 12/40/60). At 1 bar this material exhibits, on cooling, a very weak relaxor (R) response followed by a spontaneous R-to-normal ferroelectric (nFE) transition. Pressure induces crossover to full relaxer behavior and reveals the continuous evolution of the dynamics and energetics of the relaxation process. These results, which are similar to our earlier results on other disordered perovskites, appear to be general features of soft mode ferroelectrics with random site dipolar impurities or polar nanodomains. They can be understood in terms of a large decrease with pressure in the correlation radius among polar nanodomains-a unique property of soft ferroelectric mode systems. An analogy between the influences of increasing pressure and increasing La concentration on the dielectric response of PLZTs is demonstrated, but it is the pressure results that clarify the physics. (C) 1998 American Institute of Physics. [S0021-8979(98)03717-7]. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Samara, GA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 13 TC 38 Z9 41 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1998 VL 84 IS 5 BP 2538 EP 2545 DI 10.1063/1.368415 PG 8 WC Physics, Applied SC Physics GA 114CC UT WOS:000075590700024 ER PT J AU Duncan, KL Lodenquai, JF Wagh, AS Goretta, KC AF Duncan, KL Lodenquai, JF Wagh, AS Goretta, KC TI A law of mixtures for transport properties in binary particulate composites SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRICAL-CONDUCTIVITY; MECHANICAL-PROPERTIES; POLYMER COMPOSITES; PARTICLES; CERAMICS; SYSTEM AB A connected-grain model was developed earlier to explain mechanical and thermal properties of porous ceramics and sedimentary rocks. We have now generalized this model for binary particulate composites, based on simulation of a connected-grain structure of individual components of the composites by randomly selecting individual grains and shrinking them. Repetition of this procedure results in a structure of a binary particulate composite that contains channels of individual components, through which transport occurs. We developed a generalized law of mixtures in which transport properties are expressed as scaling relationships that depend on the shrinking parameter expressed as an exponent. This parameter provides the skewness of the distribution of the grains. The model is compared with various transport properties of binary composites reported in the literature. In addition, the model is tested on YBa2Cu3Ox superconductors and Ag composites that were fabricated in our laboratory and tested for electrical conductivity and elastic modulus. This test demonstrates how the model predicts two entirely different transport properties through their common microstructure and grain-size distribution. (C) 1998 American Institute of Physics. [S0021-8979(98)01017-2]. C1 Univ W Indies, Dept Phys, Kingston 7, Jamaica. Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Duncan, KL (reprint author), Univ W Indies, Dept Phys, Kingston 7, Jamaica. OI Duncan, Keith/0000-0002-7190-3675; Wagh, Arun/0000-0002-8678-7574 NR 28 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1998 VL 84 IS 5 BP 2665 EP 2672 DI 10.1063/1.368379 PG 8 WC Physics, Applied SC Physics GA 114CC UT WOS:000075590700042 ER PT J AU Kwok, SH Yu, PY Zeman, J Jullian, S Martinez, G Uchida, K AF Kwok, SH Yu, PY Zeman, J Jullian, S Martinez, G Uchida, K TI Optical studies of GaInP(ordered)/GaAs and GaInP(ordered)/GaP/GaAs heterostructures SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID VAPOR-PHASE EPITAXY; QUANTUM-WELLS; BAND OFFSETS; GAINP/GAAS INTERFACE; EMISSION BAND; GAAS; PRESSURE; ALLOYS; SUPERLATTICES; PHOTOLUMINESCENCE AB We report on a detailed optical study of emission from a series of GaInP (ordered)/GaAs heterostructures. Some of these structures contain one or two thin (similar to 2 nm) layers of GaP between the GaInP and GaAs layers. A so-called "deep emission" band at 1.46 eV is observed in all our samples. However, at high excitation power, an emission above the band gap of GaAs (previously identified as quantum well emission) emerges only in structures where GaP layers are inserted on both sides in between the GaAs well and its GaInP barriers. From the pressure dependence we have identified the deep emission peak as due to donor-acceptor pair transitions at the GaAs/GaInP interface. The insertion of GaP layers between the GaInP (ordered) and GaAs layers helps to suppress the defects which contribute to this deep emission. By applying pressure to the sample which exhibits quantum well emission we have determined its band alignments. We show that the GaP layers form two effective barriers for confining electrons within the GaAs well. However, the magnetic field dependence of the quantum well emission reveals that the electrons form only a quasi-two-dimensional gas inside the GaAs well. (C) 1998 American Institute of Physics. [S0021-8979(98)05117-2]. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. MPI, KEK, CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble, France. Univ Electrocommun, Dept Commun & Syst, Chofu, Tokyo, Japan. RP Kwok, SH (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM shkwok@yahoo.com; pyyu@lbl.gov NR 28 TC 8 Z9 8 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1998 VL 84 IS 5 BP 2846 EP 2854 DI 10.1063/1.368426 PG 9 WC Physics, Applied SC Physics GA 114CC UT WOS:000075590700065 ER PT J AU Olajos, EJ Morgan, EW Renne, RA Salem, H McVeety, B Johnson, R Phelps, RL AF Olajos, EJ Morgan, EW Renne, RA Salem, H McVeety, B Johnson, R Phelps, RL TI Acute inhalation toxicity of neutralized chemical agent identification sets (CAIS) containing agent in chloroform SO JOURNAL OF APPLIED TOXICOLOGY LA English DT Article DE inhalation toxicity; head-only; acute toxicity; rat; blistering agents; Chemical Agent Identification Sets (CAIS); Rapid Response System (RRS); sulfur mustard (HD); nitrogen mustard (HN-1); lewisite (L); chemical neutralization AB An acute head-only inhalation study was conducted in rats exposed for Ih to product solution (wastestream) resultant from the chemical neutralization of Chemical Agent Identification Sets (CAIS) containing agent (sulfur mustard (HD), nitrogen mustard (HN-1) or lewisite (L)) in chloroform. Groups of Sprague-Dawley rats were exposed to varying concentrations (24 000, 18 000, 12 000 or 6000 ppm) of CAIS wastestream An additional group was exposed to the vehicle (chloroform/t-butanol) only, at a concentration equivalent to the concentration of vehicle at the highest exposure level, Animals were evaluated for toxic effects, including assessment of toxicant-induced alterations to the ocular and respiratory systems, Mortality on exposure to 24 000 ppm of test article or to vehicle alone was high. Mortality in the other exposure groups was roughly proportional to the concentration of test article (wastestream), Toxic signs were consistent with exposure to solvent system components (chloroform/t-butanol) and to agent decomposition products/by-products. Incidence and severity of ocular effects were similar in vehicle control and treatment groups. The salient respiratory effect observed was a decreased minute volume, which was also noted in vehicle and treatment groups. (C) 1998 John Wiley & Sons, Ltd. C1 USA, Edgewood Res Dev & Engn Ctr, Chem & Biol Def Command, Aberdeen Proving Ground, MD 21010 USA. Pacific NW Lab, Richland, WA 99352 USA. RP Olajos, EJ (reprint author), USA, Edgewood Res Dev & Engn Ctr, Chem & Biol Def Command, Aberdeen Proving Ground, MD 21010 USA. NR 24 TC 3 Z9 3 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0260-437X J9 J APPL TOXICOL JI J. Appl. Toxicol. PD SEP-OCT PY 1998 VL 18 IS 5 BP 363 EP 371 DI 10.1002/(SICI)1099-1263(1998090)18:5<363::AID-JAT521>3.0.CO;2-8 PG 9 WC Toxicology SC Toxicology GA 128WW UT WOS:000076432200010 PM 9804437 ER PT J AU Archer, DG Rard, JA AF Archer, DG Rard, JA TI Isopiestic investigation of the osmotic and activity coefficients of aqueous MgSO4 and the solubility of MgSO4 center dot 7H(2)O(cr) at 298.15 K: Thermodynamic properties of the MgSO4+H2O system to 440 K SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID TEMPERATURE T=298.15 K; MAGNESIUM-SULFATE; ELEVATED-TEMPERATURES; HEAT-CAPACITIES; NACL+H2O SYSTEM; 25-DEGREES-C; CHLORIDE; VOLUMES; NA2SO4; MGCL2 AB Isopiestic determinations of the osmotic coefficient of MgSO4(aq) against NaCl(aq) and KCl(aq) reference standards were performed with long equilibration times ranging to 98 days. A value of the 298.15 K solubility of epsomite, MgSO4. 7H(2)O(cr), was also determined. The new measurements were combined with previous thermodynamic measurements to determine the thermodynamic properties of the MgSO4 + H2O system from the ice-freezing line to 440 K. The thermodynamic measurements were fitted with two different models, an ion-interaction model and a chemical-equilibrium model. The ability of the two models to represent this system was examined. C1 NIST, Phys & Chem Propert Div, Gaithersburg, MD 20899 USA. Univ Calif Lawrence Livermore Natl Lab, Earth & Environm Sci Directorate, Livermore, CA 94550 USA. RP Archer, DG (reprint author), NIST, Phys & Chem Propert Div, Gaithersburg, MD 20899 USA. NR 80 TC 63 Z9 63 U1 0 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD SEP-OCT PY 1998 VL 43 IS 5 BP 791 EP 806 DI 10.1021/je980047o PG 16 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA 119JQ UT WOS:000075892900023 ER PT J AU Jonah, CD AF Jonah, CD TI Cheating Probabilities SO JOURNAL OF CHEMICAL EDUCATION LA English DT Letter C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Jonah, CD (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 1 TC 1 Z9 1 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD SEP PY 1998 VL 75 IS 9 BP 1089 EP 1089 PG 1 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA 111DK UT WOS:000075421900019 ER PT J AU Marr, AJ Sears, TJ Chang, BC AF Marr, AJ Sears, TJ Chang, BC TI Near-infrared spectroscopy of CH2 by frequency modulated diode laser absorption SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ORBITAL ANGULAR-MOMENTUM; TRIATOMIC-MOLECULES; INTERNAL DYNAMICS; INDUCED FLUORESCENCE; SINGLET METHYLENE; RENNER-TELLER; SPECTRUM; STATE; TRANSITION; SPIN AB A diode laser spectrometer incorporating a multi-pass Herriott type cell and frequency modulation detection was used to record a previously unaccessed region of the near-infrared singlet<--singlet absorption spectrum of methylene between 10 000 cm(-1) and 10 600 cm(-1). With this spectrometer, signal-to-noise ratios close to the quantum noise Limit have been attained. Identification of rovibronic transitions to five previously unobserved levels, K=1 (a) over tilde(0,9,0), K=2 (b) over tilde(0,1,0), K =2 (a) over tilde(1,6,0), K=3 (b) over tilde(0,1,0) and K=3 (a) over tilde(0,10,0), was made. Despite the fact that the present spectra access levels within approximately 1300 cm(-1) of the barrier to linearity, the spectrum is dense and perturbed, characteristics in common with spectra recorded in many previous studies at shorter wavelengths. Recent spectroscopic observations of halomethylenes [J. Mel. Spectrosc. 188, 68 (1998)] had suggested that the CH2 spectrum might become simpler at longer wavelengths, but this was not evident in the observed spectra. The mixed nature of the singlet states is evidenced by the assignment of rovibronic transitions to levels containing primarily (a) over tilde (1)A(1) state character. The new measurements provide a stringent test for modern theoretical models for CH2 and will enable refinement of the electronic potential surfaces. (C) 1998 American Institute of Physics. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Natl Cent Univ, Dept Chem, Chungli 32054, Taiwan. RP Sears, TJ (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 40 TC 28 Z9 28 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1998 VL 109 IS 9 BP 3431 EP 3442 DI 10.1063/1.476938 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 114ZP UT WOS:000075639300016 ER PT J AU Kindt, JT Tully, JC Head-Gordon, M Gomez, MA AF Kindt, JT Tully, JC Head-Gordon, M Gomez, MA TI Electron-hole pair contributions to scattering, sticking, and surface diffusion: CO on Cu(100) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LASER-INDUCED DESORPTION; MOLECULAR-DYNAMICS; METAL-SURFACES; EXCITATION; CHEMISORPTION; VIBRATIONS; PT(111); GAS; PROBABILITY; SIMULATIONS AB To assess the importance of coupling to electron-hole pair (ehp) excitations for molecular sticking, scattering, and diffusion dynamics at metal surfaces, simulations of the CO/Cu(100) system were performed using the "molecular dynamics with electronic frictions" method. Over a range of incident translational energies, energy losses to ehp excitations produce a moderate increase in sticking probability and account for 5%-10% of initial translational energy in scattered molecules, significantly less than phonon losses. Vibrational excitation and deexcitation of scattered molecules, while remaining a minor pathway for energy flow, is strongly affected by the inclusion of ehp excitations. Finally, although equilibrium diffusion constants are unaffected by the inclusion of coupling to ehp, it causes a significant quenching of transient mobility following adsorption of translationally hot molecules. (C) 1998 American Institute of Physics. C1 Yale Univ, Dept Chem, New Haven, CT 06511 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Kindt, JT (reprint author), Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA. NR 39 TC 68 Z9 68 U1 3 U2 20 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1998 VL 109 IS 9 BP 3629 EP 3636 DI 10.1063/1.476960 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 114ZP UT WOS:000075639300038 ER PT J AU Almeida, AL Martins, JBL Taft, CA Longo, E Lester, WA AF Almeida, AL Martins, JBL Taft, CA Longo, E Lester, WA TI Ab initio and semiempirical studies of the adsorption and dissociation of water on pure, defective, and doped MgO (001) surfaces SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LARGE CLUSTER-MODELS; MAGNESIUM-OXIDE; CO INTERACTION; ELECTRONIC-STRUCTURE; OXIDATIVE DIMERIZATION; CHARGE-DISTRIBUTION; 3D-METAL SURFACES; SOLID HYDROXIDES; ZNO SURFACES; HYDROGEN AB Ab initio and semiempirical calculations of large cluster models have been performed in order to study water adsorption and dissociation on pure, defective (vacancies) and doped (Li, Na, K, Ca, Fe) MgO (001) surfaces. The geometries of the adsorbed and dissociated molecules have been optimized preparatory to analysis of binding energies, stretching frequencies, charge transfers, preferential sites of interaction, and bond distances. We have used Mulliken, natural bond order, and electrostatic-derived atomic and overlap populations to analyze charge distributions in the clusters. We have also investigated transition structures, activation energies, energy gaps, HOMO, density of states, SCF orbital energies as well as the acid-base properties of our cluster model. Numerical results are compared, where possible, with experiment, interpreted in the framework of various analytical models, and correlated with site coordination numbers, corner and edge site preferential locations, and direction of charge transfer. A thorough charge analysis indicates substantial charge redistribution in the magnesium oxide crystal as a result of water adsorption and dissociation in pure, defective, and doped MgO crystals. The introduction of heavier impurities and vacancies could produce substantial changes in the physical and chemical properties of the catalyst and increase the binding and dissociation energies. Some of the largest changes originate from the introduction of vacancies. Two and three-dimensional potential energy surfaces are used to investigate activation energies of hydroxylation on the MgO surface. Stretching frequencies are correlated with magnesium and oxygen coordination numbers. (C) 1998 American Institute of Physics. C1 Ctr Brasileiro Pesquisas Fis, Dept Mat Condensada & Fis Estat, BR-22290180 Rio De Janeiro, Brazil. Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Almeida, AL (reprint author), Ctr Brasileiro Pesquisas Fis, Dept Mat Condensada & Fis Estat, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro, Brazil. RI Martins, Joao/I-6226-2012; Longo, Elson/B-9395-2012 OI Martins, Joao/0000-0001-8677-3239; Longo, Elson/0000-0001-8062-7791 NR 80 TC 26 Z9 26 U1 0 U2 20 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1998 VL 109 IS 9 BP 3671 EP 3685 DI 10.1063/1.476964 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 114ZP UT WOS:000075639300042 ER PT J AU Felmy, AR Dixon, DA Rustad, JR Mason, MJ Onishi, LM AF Felmy, AR Dixon, DA Rustad, JR Mason, MJ Onishi, LM TI The hydrolysis and carbonate complexation of strontium and calcium in aqueous solution. Use of molecular modeling calculations in the development of aqueous thermodynamic models SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article DE calcium; strontium; hydrolysis; carbonate complexation; thermodynamics; molecular modeling; solubility ID CO2-H2O SOLUTIONS; NATURAL-WATERS; SOLUBILITY; PREDICTION; APPROXIMATION; 25-DEGREES-C; ARAGONITE; ALKALINE; DYNAMICS; ENERGY AB The hydrolysis and carbonate complexation of the alkaline earth cations Ca2+ and Sr2+ were investigated by using a combined experimental and modeling approach. The modeling approach uses both macroscopic thermodynamic models and molecular modeling at the density functional theory (DFT) level. The molecular modeling calculations identify possible speciation schemes in the thermodynamic modeling and provide molecular level insight into the macroscopically observed thermodynamic measurements. In order to develop accurate thermodynamic models valid to high electrolyte concentration and to test for the possible existence of species suggested by the molecular models, experimental measurements were made on the solubility of Ca(OH)(2), Sr(OH)(2). 8H(2)O, and carbonate compounds extending to high base molality (approximate to 5 mol kg(-1)), or carbonate molality (approximate to 2 mol.kg(-1)). A thermodynamic model is developed that satisfactorily explains the macroscopic aqueous thermodynamic data and correlates with the molecular modeling results. The first published values of the equilibrium constants for the formation of Sr(CO3)(2)(2-)(aq) and Ca(CO3)(2)(2-)(aq), and of the solubility product of Sr(OH)(2). 8H(2)O are also provided. In certain cases, specifically when the DFT calculations suggest that the hydroxyl groups are more closely associated viith the first hydration layer of water molecules than directly with the central alkaline earth cation, the thermodynamic relations for these cation-hydroxyl interactions are described by means of Fitter ion-interaction parameters, rather than by the explicit introduction of an aqueous hydrolysis species, (C) 1998 Academic Press. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Felmy, AR (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. NR 35 TC 22 Z9 22 U1 2 U2 7 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD SEP PY 1998 VL 30 IS 9 BP 1103 EP 1120 DI 10.1006/jcht.1998.0376 PG 18 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA 124ZY UT WOS:000076213900007 ER PT J AU Kim, J Miller, NL Guetter, AK Georgakakos, KP AF Kim, J Miller, NL Guetter, AK Georgakakos, KP TI River flow response to precipitation and snow budget in California during the 1994/95 winter SO JOURNAL OF CLIMATE LA English DT Article ID SOIL HYDROLOGY; MODEL; PARAMETERIZATION; STREAMFLOW; SIMULATION; TOPMODEL; SCHEME; WATER AB A numerical study of precipitation and river flow from November 1994 to May 1995 at two California basins is presented. The Hopland watershed of the Russian River in the northern California Coastal Range and the headwater of the North Fork American River in the northern Sierra Nevada were selected to investigate the hydroclimate, snow budget, and streamflow at different elevations. Simulated precipitation and streamflow at the Hopland basin closely approximated observed values. An intercomparison between the semidistributed TOPMODEL and two versions of the lumped Sacramento model for the severe storm event of January 1995 indicates that both types of models predicted a similar response of river outflows from this basin, with the exception that TOPMODEL predicted a faster recession of river flow with less base flow after precipitation ended. Precipitation in this low-elevation watershed was predominantly in the form of rain, causing a fast streamflow response. The high-elevation Sierra Nevada watershed received most of its precipitation as snowfall. As a result, the frozen water held in surface storage delayed runoff and streamflow. Application of a simple elevation-dependent snowfall and rainfall partitioning scheme showed the significance of finescale terrain variation in the surface hydrology at high-elevation watersheds. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Hydrol Res Ctr, San Diego, CA USA. RP Kim, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, L-256,1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Miller, Norman/E-6897-2010 NR 38 TC 15 Z9 15 U1 1 U2 4 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0894-8755 J9 J CLIMATE JI J. Clim. PD SEP PY 1998 VL 11 IS 9 BP 2376 EP 2386 DI 10.1175/1520-0442(1998)011<2376:RFRTPA>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 123YG UT WOS:000076152800014 ER PT J AU Xu, Y Xu, D Uberbacher, EC AF Xu, Y Xu, D Uberbacher, EC TI An efficient computational method for globally optimal threading SO JOURNAL OF COMPUTATIONAL BIOLOGY LA English DT Article DE fold recognition; protein threading; energy functions; combinatorial optimization; and complexity analysis ID PROTEIN DATA-BANK; 3-DIMENSIONAL STRUCTURE; SEQUENCE; FOLD; RECOGNITION; ALIGNMENT AB Computational recognition of native-like folds of an anonymous amino acid sequence from a protein fold database is considered to be a promising approach to the three-dimensional (3D) fold prediction of the amino acid sequence. We present a new method for protein fold recognition through optimally aligning an amino acid sequence and a protein fold template (protein threading). The fitness of aligning an amino acid sequence with a fold template is measured by (1) the singleton fitness, representing the compatibility of substituting one amino acid by another and the combined preference of secondary structure and solvent accessibility for a particular amino acid, (2) the pair,vise interaction, representing the contact preference between a pair of amino acids, and (3) alignment gap penalties. Though a protein threading problem so defined is known to be NP-hard in the most general sense, our algorithm runs efficiently if we place a cutoff distance on the pairwise interactions, as many of the existing threading programs do. For an amino acid sequence of size n and a fold template of size m with M core secondary structures, the algorithm finds an optimal alignment in O (Mn1.5C+1 + mn(C+1)) time and O (MnC+1) space, where C is a (small) nonnegative integer, determined by a particular mathematical property of the pairwise interactions. As a case study, we have demonstrated that C is less than or equal to 4 for about 75% of the 293 unique folds in our protein database, when pairwise interactions are restricted to amino acids less than or equal to 7 Angstrom apart (measured between their beta carbon atoms). An approximation scheme is developed for fold templates with C > 4, when threading requires too much memory and time to be practical on a typical workstation. C1 Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, Oak Ridge, TN 37831 USA. RP Xu, Y (reprint author), Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, Oak Ridge, TN 37831 USA. EM xyn@ornl.gov NR 29 TC 53 Z9 56 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 USA SN 1066-5277 J9 J COMPUT BIOL JI J. Comput. Biol. PD FAL PY 1998 VL 5 IS 3 BP 597 EP 614 DI 10.1089/cmb.1998.5.597 PG 18 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Computer Science, Interdisciplinary Applications; Mathematical & Computational Biology; Statistics & Probability SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Computer Science; Mathematical & Computational Biology; Mathematics GA 119WL UT WOS:000075921100017 PM 9773353 ER PT J AU Dohner, JL AF Dohner, JL TI A guidance and control algorithm for scent tracking micro-robotic vehicle swarms SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article ID MOBILE ROBOTS; OBSTACLES AB Cooperative micro-robotic scent tracking vehicles are designed to collectively "sniff out" locations of high scent concentrations in unknown, geometrically complex environments. These vehicles are programed with guidance and control algorithms that allow inter cooperation among vehicles. In this paper, a cooperative guidance and control algorithm for scent tracking micro-robotic vehicles is presented. This algorithm is comprised of a sensory compensation sub-algorithm using point source cancellation, a guidance sub-algorithm using gradient descent tracking, and a control sub-algorithm using proportional feedback. The concepts of social rank and point source cancellation are new concepts introduced within. Simulation results for cooperative vehicles swarms are given. Limitations are discussed. C1 Sandia Natl Labs, Dept 9234, Albuquerque, NM 87185 USA. RP Dohner, JL (reprint author), Sandia Natl Labs, Dept 9234, MS0439, Albuquerque, NM 87185 USA. NR 13 TC 0 Z9 0 U1 3 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD SEP PY 1998 VL 120 IS 3 BP 353 EP 359 DI 10.1115/1.2805409 PG 7 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA 119WC UT WOS:000075920300008 ER PT J AU Boyd, P Berges, JA Harrison, PJ AF Boyd, P Berges, JA Harrison, PJ TI In vitro iron enrichment experiments at iron-rich and -poor sites in the NE subarctic Pacific SO JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY LA English DT Article DE phytoplankton; NE subarctic Pacific; in vitro Fe enrichment; photosynthetic capability ID SUB-ARCTIC PACIFIC; NITRATE REDUCTASE-ACTIVITY; STEADY-STATE LIGHT; PHYTOPLANKTON PHOTOSYNTHESIS; MARINE-PHYTOPLANKTON; NITROGEN LIMITATION; GROWTH-RATES; OPEN SEA; IN-SITU; OCEAN AB Despite evidence of Fe limitation of phytoplankton biomass in large areas of the ocean: few studies have assessed the relationships between algal stocks and Fe supply. An E-W survey transected the coastal and the open NE subarctic Pacific in May 1995, and revealed low nitrate (< 1 mu M) inshore, which increased westwards to ca. 8 mu M. Over this transect, dissolved Fe fell from > 3 nM kg(-1) inshore to < 0.5 nM kg(-1) offshore. Fluorescence indices of photosystem II quantum efficiency (F-v/F-m, measured using DCMU) increased with distance offshore, but were always submaximal, indicating physiological constraints on photosynthetic capabilities, likely nitrogen inshore and Fe offshore. Six day in vitro Fe enrichments were performed at stations that were 500 (P12, Fe-rich) and 1000 lan offshore (P26, Fe-poor). At P26, there were marked increases in NO3 uptake and in chlorophyll a in both the control and Fe enrichment (3.5 nM Fe). Changes in nitrate reductase (NR) activity paralleled changes in NO3 uptake, indicating true physiological responses. Measurements showed that controls had been contaminated with 1.8 nM Fe. However, transient increases in F-v/F-m were observed only in Fe treatments and not in contaminated controls. This may have been due to the form in which the Fe was added (chelated Fe in treatments versus probably non-chelated Fe in "controls"). The time scale for the rise and fall of F-v/F-m is similar to that reported in the Ironex experiments. At P12, Fe-enrichment did not increase NO3 uptake or NR activity, compared to the controls. Reasons for the differences in the results of enrichments at P26 and P12 are unclear. Neither Fe nor NO3 was limiting at P12, yet F-v/F-m remained sub-maximal, suggesting that non-physiological factors (e.g. grazing) were not responsible. Unlike P26, at P12, there was a relatively small "seed" population of diatoms; factors controlling diatom abundances under ambient conditions may be crucial in determining the outcome of Fe enrichments. (C) 1998 Elsevier Science B.V. C1 Univ British Columbia, Dept Oceanog, Vancouver, BC V6T 1Z4, Canada. Brookhaven Natl Lab, Div Oceanog & Atmospher Sci, Upton, NY 11973 USA. RP Boyd, P (reprint author), Univ Otago, Dept Chem, NTWA, Ctr Chem & Phys Oceanog, POB 56, Dunedin, New Zealand. RI Berges, John /D-9520-2012; Boyd, Philip/J-7624-2014 OI Berges, John /0000-0002-3124-4783; Boyd, Philip/0000-0001-7850-1911 NR 38 TC 34 Z9 36 U1 0 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0981 J9 J EXP MAR BIOL ECOL JI J. Exp. Mar. Biol. Ecol. PD SEP 1 PY 1998 VL 227 IS 1 BP 133 EP 151 DI 10.1016/S0022-0981(97)00264-5 PG 19 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA ZV504 UT WOS:000074311200008 ER PT J AU Lyon, JF Neilson, GH AF Lyon, JF Neilson, GH TI Compact stellarators SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE stellarators; compact stellarators; fusion reactors AB Stellarators offer advantages for reactors, namely the potential for steady state operation with low recirculating power (high engineering Q) and without disruptions. A substantial portion of the world fusion program is devoted to the development of stellarators as a magnetic confinement system. The world stellarator program, as it currently exists, is focused on high-aspect-ratio (R/a = 5 - 11) designs that lead to very large reactors. For example the German advanced stellarator reactor design HSR has an aspect ratio of 12 and a major radius of 22 m. An important issue for stellarator research is whether more compact reactor designs are possible. Could the advantage of stellarators also be realized at dimensions and performance levels closer to those of the advanced tokamak reactor ARIES-RS (R = 5.5 m, neutron wall load of 4 MW/m2)? Theory has identified a class of "compact stellarator" plasma configurations that could be the basis for such a design. They are promising, but need to be studied experimentally in order to realistically assess their potential. The most cost-effective way to accomplish this is to carry out the compact stellarator proof-of-principle program that has been proposed by the U.S. stellarator community. This program would answer the basic physics questions for compact stellarators and make important contributions to the world stellarator knowledge base at a cost (about $30M/year) that is modest compared to expenditures for stellarator and tokamak research world-wide. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Lyon, JF (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 189 EP 191 DI 10.1023/A:1021841825478 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500003 ER PT J AU Thomassen, KI Hooper, EB Ryutov, DD AF Thomassen, KI Hooper, EB Ryutov, DD TI The spheromak path to fusion SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE spheromak; energy confinement; magnetic fusion energy reactor ID OPPORTUNITIES; REACTOR AB Options for a spheromak fusion-energy reactor are described and provide examples of the attractive opportunities which this magnetic configuration offers. However, the ability of the spheromak to confine plasma energy has not yet been demonstrated. The physics issues, including confinement in the presence of current drive by a magnetic dynamo driven by helicity injection, are summarized. These are being studied in the Sustained Spheromak Physics Experiment at LLNL. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Thomassen, KI (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 13 TC 0 Z9 0 U1 0 U2 3 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 193 EP 199 DI 10.1023/A:1021893809548 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500004 ER PT J AU Payne, SA Bibeau, C Beach, RJ Bayramian, A Chanteloup, JC Ebbers, CA Emanuel, MA Nakana, H Orth, CD Rothenberg, JE Schaffers, KI Seppala, LG Skidmore, JA Sutton, SB Zapata, LE Powell, HT AF Payne, SA Bibeau, C Beach, RJ Bayramian, A Chanteloup, JC Ebbers, CA Emanuel, MA Nakana, H Orth, CD Rothenberg, JE Schaffers, KI Seppala, LG Skidmore, JA Sutton, SB Zapata, LE Powell, HT TI Diode-pumped solid-state lasers for inertial fusion energy SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE diodes; Yb : S-FAP crystals; solid-state lasers; inertial fusion energy ID DRIVER AB We have begun building the "Mercury" laser system as the first in a series of new generation diode-pumped solid-state lasers for inertial fusion research. Mercury will integrate three key technologies: diodes, crystals, and gas cooling, within a unique laser architecture that is scalable to kilojoule and megajoule energy levels for fusion energy applications. The primary near-term performance goals include 10% electrical efficiencies at 10 Hz and 100J with a 2-10 ns pulse length at 1.047 mu m wavelength. When completed, Mercury will allow rep-rated target experiments with multiple chambers for high energy density physics research. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Payne, SA (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. RI chanteloup, jean-christophe/H-6514-2013 OI chanteloup, jean-christophe/0000-0002-5643-0056 NR 9 TC 11 Z9 21 U1 0 U2 2 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 213 EP 217 DI 10.1023/A:1021802111366 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500008 ER PT J AU Bangerter, R AF Bangerter, R TI Heavy ion fusion accelerator research SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE heavy ion fusion; accelerators AB This paper describes an economical program for heavy ion fusion accelerator research. The heavy ion accelerator research program is part of a larger national research program to develop inertial fusion for commercial power production. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Bangerter, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 221 EP 222 DI 10.1023/A:1021806312274 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500010 ER PT J AU Barnard, JJ AF Barnard, JJ TI Nonneutral plasma science issues for heavy ion drivers SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE inertial fusion energy; heavy ion accelerators; space-charge-dominated beams; emittance growth ID BEAM; INSTABILITY AB A review of nonneutral plasma science issues for heavy ion drivers is presented. The requirements on transverse and longitudinal focusing at the target lead to constraints on the 6D phase space. Mechanisms which act to prevent focusability, including emittance growth, space charge and instabilities are discussed. Experiments which have explored and validated our understanding of beam transport and focusability of space-charge dominated heavy ion beams are described. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Barnard, JJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 223 EP 225 DI 10.1023/A:1021858329113 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500011 ER PT J AU Key, MH Campbell, EM Cowan, TE Hatchett, SP Henry, EA Koch, JA Langdon, AB Lasinski, BF MacKinnon, A Offenberger, AA Pennington, DM Perry, MD Phillips, TJ Sangster, TC Singh, MS Snavely, RA Stoyer, MA Tsukamoto, M Wharton, KB Wilks, SC AF Key, MH Campbell, EM Cowan, TE Hatchett, SP Henry, EA Koch, JA Langdon, AB Lasinski, BF MacKinnon, A Offenberger, AA Pennington, DM Perry, MD Phillips, TJ Sangster, TC Singh, MS Snavely, RA Stoyer, MA Tsukamoto, M Wharton, KB Wilks, SC TI The potential of fast ignition and related experiments with a petawatt laser facility SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA ID SOLID TARGETS; SHORT-PULSE; ELECTRONS; DENSITY; PLASMA AB A model of energy gain induced by fast ignition of thermonuclear burn in compressed deuterium-tritium fuel, is used to show the potential for 300x gain with a driver energy of 1 MJ, if the National Ignition Facility (NIF) were to be adapted for fast ignition. The physics of fast ignition has been studied using a petawatt laser facility at the Lawrence Livermore National Laboratory. Laser plasma interaction in a preformed plasma on a solid target leads to relativistic self-focusing evidenced by x-ray images. Absorption of the laser radiation transfers energy to an intense source of relativistic electrons. Good conversion efficiency into a wide angular distribution is reported. Heating by the electrons in solid density CD2 produces 0.5 to 1keV temperature, inferred from the D-D thermo-nuclear neutron yield. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Key, MH (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-473, Livermore, CA 94550 USA. RI MacKinnon, Andrew/P-7239-2014; Cowan, Thomas/A-8713-2011 OI MacKinnon, Andrew/0000-0002-4380-2906; Cowan, Thomas/0000-0002-5845-000X NR 22 TC 16 Z9 16 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 231 EP 236 DI 10.1023/A:1021862430021 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500013 ER PT J AU Mattas, RF AF Mattas, RF TI The potential for Advanced Limiter/divertor Systems SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CALIFORNIA DE plasma limiters; plasma divertors AB The Advanced Limiter-divertor Plasma-facing Systems (ALPS) program was initiated in FY 1998 in order to evaluate the potential for improved performance and lifetime for plasma-facing systems. The main goal of the program is; to demonstrate the advantages of advanced limiter/divertor systems over conventional systems in terms of power density capability, component lifetime, and power conversion efficiency, while providing for safe operation and minimizing impurity concerns for the plasma. C1 Argonne Natl Lab, Fus Power Program, Argonne, IL 60439 USA. RP Mattas, RF (reprint author), Argonne Natl Lab, Fus Power Program, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 251 EP 252 DI 10.1023/A:1021818615000 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500016 ER PT J AU Ryutov, DD Baldwin, DE Hooper, EB Thomassen, KI AF Ryutov, DD Baldwin, DE Hooper, EB Thomassen, KI TI A high-flux source of fusion neutrons for material and component testing SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion Power Associates Annual Meeting and Symposium on Cost-Effective Steps to Fusion Power CY JAN 25-27, 1999 CL MARINA DEL REY, CA C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Gen Atom Co, San Diego, CA 92186 USA. RP Ryutov, DD (reprint author), Lawrence Livermore Natl Lab, POB 808,L-630, Livermore, CA 94551 USA. NR 20 TC 11 Z9 11 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD SEP PY 1998 VL 17 IS 3 BP 253 EP 257 DI 10.1023/A:1021870631838 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 359EX UT WOS:000089599500017 ER PT J AU Borovsky, JE Thomsen, MF Elphic, RC Cayton, TE McComas, DJ AF Borovsky, JE Thomsen, MF Elphic, RC Cayton, TE McComas, DJ TI The transport of plasma sheet material from the distant tail to geosynchronous orbit SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Review ID SELF-CONSISTENT THEORY; MAGNETIC-FIELD MODEL; STEADY MAGNETOSPHERIC CONVECTION; PROTON CYCLOTRON INSTABILITY; UV AURORAL DISTRIBUTION; SOLAR-WIND; POLYTROPIC INDEX; BOUNDARY-LAYER; NEUTRAL SHEET; STATISTICAL CHARACTERISTICS AB Several aspects of mass transport in the Earth's plasma sheet are examined. The evolution of plasma sheet material as it moves earthward is examined by statistically comparing plasma sheet properties at three different downtail distances: near-Earth plasma sheet properties obtained from measurements by 1989-046 near the geomagnetic equator near midnight at 6.6 R-E, midtail plasma sheet properties obtained from ISEE 2 measurements during 333 encounters With the neutral sheet, and distant-plasma sheet properties obtained from ISEE 2 measurements during 53 encounters with the interface between the plasma sheet and the plasma sheet boundary layer. Examination of the evolution of the plasma sheet through pressure-density space shows that the transport is nearly adiabatic (gamma = 1.52), with a loss of entropy observed in the near-Earth region. The estimated pressure loss from the plasma sheet associated with the aurora is able to account for the observed decrease in entropy. The near-Earth plasma sheet plasma is also found to be compressed much less than would be expected from magnetic field models. Examination of the evolution of the plasma sheet through density-flux tube-volume space (with the aid of the T89c magnetic field model) indicates that there is a substantial loss of mass from plasma sheet flux tubes. Global magnetic reconnection during substorms and, patchy reconnection at other times is invoked to account (1) for the required mass loss, (2) for the related lack of compression, and (3) for an observed disconnection between ionospheric convection and plasma sheet convection. This reconnection must occur closer than 20 R-E downtail. Selective transport is examined by statistically analyzing the ISEE 2 neutral sheet crossing data set: strong transport is found to be associated with low densities, with weak B-z, and with large flux tube-volume. A correlation between the direction of the flow in the plasma sheet and the solar wind velocity indicates that earthward transport is stronger when the solar wind velocity is lower. An examination of near-Earth and of midtail plasma sheet densities, temperatures, and entropies shows that the plasma sheet is usually spatially homogeneous, contrary to a "bubbles and blobs" picture of transport. Several new points of view about plasma sheet transport are discussed, including the dominant role of near-Earth reconnection, the importance of auroral zone pressure loss, the control of the plasma sheet properties by the density and speed of the solar wind, and the disconnection of the ionospheric and plasma sheet flow patterns. C1 Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, Space & Atmospher Sci Grp, Mail Stop D466, Los Alamos, NM 87545 USA. EM jborovsky@lanl.gov NR 151 TC 90 Z9 92 U1 3 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1998 VL 103 IS A9 BP 20297 EP 20331 DI 10.1029/97JA03144 PG 35 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 118BG UT WOS:000075817300002 ER PT J AU Zong, QG Wilken, B Woch, J Mukai, T Yamamoto, T Reeves, GD Doke, T Maezawa, K Williams, DJ Kokubun, S Ullaland, S AF Zong, QG Wilken, B Woch, J Mukai, T Yamamoto, T Reeves, GD Doke, T Maezawa, K Williams, DJ Kokubun, S Ullaland, S TI Energetic oxygen ion bursts in the distant magnetotail as a product of intense substorms: Three case studies SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID DEEP GEOMAGNETIC TAIL; PLASMA SHEET; FLUX ROPES; O+ IONS; SATELLITE-OBSERVATIONS; IONOSPHERIC ORIGIN; BOUNDARY-LAYER; AURORAL-ZONE; MARCH 22; LOBE AB On the basis of Geotail high energy particle - low energy particle detector (HEP-LD) observations, this paper reports on three energetic (144 - 4000 keV) oxygen burst sequences detected in the distant tail (Xgse = -40 to -66 R-E) and their relation to substorm signatures. Those energetic oxygen ion bursts lasted only 20 to 30 min and exhibited strong beam-like structures. Two of the events (at about 1000 and 1900 UT on February 13, 1994) occurred in tailward flowing plasma after the flow direction changed from earthward to tailward; geostationary and ground based observations detected intense substorm activity during these periods, and the local magnetic field component B-z assumed predominantly negative values. The occurrence of a magnetic field with southward polarity and oxygen bursts embedded in tailward flowing plasma is consistent with the basic signatures of reconnection (formation of a neutral line) in the magnetotail. The third energetic oxygen burst with earthward flow was observed relatively close to Earth on August 27, 1993, X = -40 R-E. No reversal in the plasma flow direction was seen, and the magnetic field polarity was essentially positive throughout the event. This is consistent with a "near-Earth" neutral line that had formed beyond X = -40 R-E. We conclude that (1) a large amount of heavy ions from the ionosphere can be transferred to the distant tail and accelerated to high energies during substorm activity and that (2) these oxygen O+ ions from the polar ionosphere can be considered as "tracer ions" in the substorm dynamical process. C1 Max Planck Inst Aeron, D-37191 Katlenburg Lindau, Germany. Inst Space & Astronaut Sci, Sagamihara, Kanagawa 229, Japan. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Waseda Univ, Adv Res Ctr Sci & Engn, Tokyo 169, Japan. Nagoya Univ, Dept Phys, Nagoya, Aichi 46401, Japan. Nagoya Univ, Solar Terr Environm Lab, Toyokawa, Aichi 442, Japan. Univ Bergen, Dept Phys, N-5007 Bergen, Norway. RP Zong, QG (reprint author), Max Planck Inst Aeron, D-37191 Katlenburg Lindau, Germany. RI Reeves, Geoffrey/E-8101-2011 OI Reeves, Geoffrey/0000-0002-7985-8098 NR 46 TC 29 Z9 31 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1998 VL 103 IS A9 BP 20339 EP 20363 DI 10.1029/97JA01146 PG 25 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 118BG UT WOS:000075817300004 ER PT J AU Kahler, S Crooker, NU Gosling, JT AF Kahler, S Crooker, NU Gosling, JT TI Properties of interplanetary magnetic sector boundaries based on electron heat-flux flow directions SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HELIOSPHERIC CURRENT SHEET; WIND PLASMA-EXPERIMENT; SOLAR-WIND; FIELD; RECONNECTION; TOPOLOGY AB We have used the solar wind electron heat flux flow directions to determine the interplanetary magnetic field polarities for the ISEE 3 period from 1978 to 1982. This technique assumes that the heat flux electrons flow away from the Sun along magnetic field lines. It provides the field polarities independently of the field directions. The resulting distribution of sector durations and the changes in that distribution with solar activity cycle are presented for four 1-year periods. The large-scale sectors expected from extrapolation of the Stanford source surface maps are present along with a population of small-scale sectors with a peak in the time range of 9 hour to 1 day. About half the small-scale sectors contain bidirectional electron (BDE) flows, suggesting their origins in coronal mass ejections. We also examine cases of false polarities, in which the directions of the fields imply polarities opposite to those determined from the heat-flux directions. These constitute only 6 to 8% of all the hourly averages of the data. The majority (78%) of these false polarity regions were not associated with BDEs, and 75% were of only 1 or 2 hour durations. False polarity regions tended to lie nearly orthogonal to the spiral field angles and at relatively high latitudinal angles. While multiple (greater than or equal to 3 in 24 hours) current sheet crossings are common, we find no cases consistent with a wavy current sheet. C1 USAF, Res Lab, VSBS, Hanscom AFB, MA 01731 USA. Boston Univ, Ctr Space Phys, Boston, MA 02215 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kahler, S (reprint author), USAF, Res Lab, VSBS, 29 Randolph Rd, Hanscom AFB, MA 01731 USA. NR 24 TC 23 Z9 23 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1998 VL 103 IS A9 BP 20603 EP 20612 DI 10.1029/98JA01745 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 118BG UT WOS:000075817300025 ER PT J AU Daughton, W Gary, SP AF Daughton, W Gary, SP TI Electromagnetic proton/proton instabilities in the solar wind SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ION-BEAM INSTABILITIES; PROTON CYCLOTRON INSTABILITY; PLASMA DEPLETION LAYER; TEMPERATURE ANISOTROPY; MAGNETOSHEATH; SIMULATIONS; BETA AB Electromagnetic proton/proton instabilities are excited by the relative streaming parallel to the magnetic field of two distinct proton components, the more dense core and the more tenuous beam. Here linear Vlasov theory is used to study these instabilities in a homogeneous plasma model. Under conditions often observed in the high-speed solar wind, both magnetosonic and Alfven modes become proton/proton unstable; for various parameter domains there are two unstable regimes of the magnetosonic mode and three unstable regimes of the Alfven mode. In a dimensionless parameter model representing typical high-speed solar wind conditions, the most strongly unstable modes are the magnetosonic instability with maximum growth rate in the direction of the background magnetic field and the Alfven mode at propagation oblique to that field. Although the former mode has been regarded by several previous researchers to be the dominant proton/proton instability in the solar wind, the results described here indicate that the strongly unstable regime of the Alfven mode, which previously has not been studied in a solar wind model, has the lower threshold at sufficiently large beam density and/or sufficiently small core beta. Earlier studies of proton/proton instabilities in the solar wind based on the assumption that the magnetosonic mode is most important may need reconsideration. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Daughton, W (reprint author), Univ Calif Los Alamos Natl Lab, MS D466, Los Alamos, NM 87545 USA. RI Daughton, William/L-9661-2013 NR 26 TC 71 Z9 71 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1998 VL 103 IS A9 BP 20613 EP 20620 DI 10.1029/98JA01385 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 118BG UT WOS:000075817300026 ER PT J AU Kallosh, R Rahmfeld, J Rajaraman, A AF Kallosh, R Rahmfeld, J Rajaraman, A TI Near horizon superspace SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE M-theory; D-branes; superstring vacua; superspaces ID 11-DIMENSIONAL SUPERGRAVITY AB The adS(p+2) x Sd-p-2 geometry of the near horizon branes is promoted to a supergeometry: the solution of the supergravity constraints for the vielbein, connection and form superfields are found. This supergeometry can be used for the construction of new superconformal theories. We also discuss the Green-Schwarz action for a type IIB string on adS(5) x S-5. C1 Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kallosh, R (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA. EM kallosh@physics.stanford.edu; rahmfeld@leland.stanford.edu; arvindra@leland.stanford.edu NR 14 TC 77 Z9 77 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1029-8479 J9 J HIGH ENERGY PHYS JI J. High Energy Phys. PD SEP PY 1998 IS 9 AR 002 PG 9 WC Physics, Particles & Fields SC Physics GA 124EN UT WOS:000076168700001 ER PT J AU Chandler, DP AF Chandler, DP TI Redefining relativity: quantitative PCR at low template concentrations for industrial and environmental microbiology SO JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY LA English DT Article DE quantitative PCR; competitive PCR; MPN-PCR; low template; bias; polymerase chain reaction; environmental microbiology ID POLYMERASE CHAIN-REACTION; DIRECT DNA EXTRACTION; RIBOSOMAL-RNA GENES; MESSENGER-RNA; COMPETITIVE PCR; REACTION AMPLIFICATION; SUBSURFACE SEDIMENTS; LIMITING DILUTION; ESCHERICHIA-COLI; RAPID METHOD AB The application of PCR techniques in environmental and industrial microbiology is complicated by innumerable organic and inorganic contaminants and enzyme inhibitors that copurify with nucleic acids. These complications are compounded in quantitative PCR (qPCR) methods, which are predicated upon subtle yet significant assumptions of amplification efficiency and the representativeness of the sample with respect to the environment or industrial process from which it was obtained. In low-biomass and/or low-template situations, additional concerns related to target gene spatial heterogeneity in the sample, differential DNA (or RNA) extraction efficiency, molecular sampling error, attenuation of PCR inhibitors and amplification bias can quickly undermine fundamental assumptions of conventional competitive PCR (cPCR) and most-probable-number PCR (MPN-PCR) formats. A critical evaluation of cPCR and MPN-PCR assumptions is therefore presented within the context of environmental microbiology and low-template enumerations. Fundamental conclusions from the analysis of qPCR assumptions are that: (a) environmental qPCR enumerations are invariably estimates, not absolute enumerations, which are relative to the PCR standard; (b) traditional cPCR assays are ill-suited for environmental applications, especially in low-biomass situations; and (c) both cPCR and traditional MPN-PCR practices insufficiently account for field-scale, process-level or experimental variations that arise and become amplified in PCR enumerations. Thus, sample representativeness and errors related to sample replication are frequently more important than errors related to the qPCR assay itself. Based upon this critique of qPCR assumptions, an alternate qPCR method for routine environmental application is described which is based upon replicative limiting dilution analysis and the pragmatic tradeoffs between analytical sensitivity and practical utility. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Chandler, DP (reprint author), Pacific NW Lab, 900 Battelle Blvd,Mail Stop P7-50, Richland, WA 99352 USA. NR 73 TC 67 Z9 68 U1 4 U2 16 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE RG21 6XS, HAMPSHIRE, ENGLAND SN 1367-5435 J9 J IND MICROBIOL BIOT JI J. Ind. Microbiol. Biotechnol. PD SEP PY 1998 VL 21 IS 3 BP 128 EP 140 DI 10.1038/sj.jim.2900546 PG 13 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 152AB UT WOS:000077752100006 ER PT J AU Vo, NV AF Vo, NV TI Fabrication of wind-react and react-wind high-temperature superconducting Bi-2223/Ag coils and magnets SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article DE superconducting coils; superconducting magnets; wind-react; react-wind; composite materials ID BI-(PB)-SR-CA-CU-O TAPES; SINTERING PERIODS; MICROSTRUCTURE; WIRES AB High-temperature superconducting (HTS) (Bi,Pb)(2)Sr2Ca2Cu3O10/Ag coils and magnets have been successfully fabricated using both the wind-react (W-R) and react-wind (R-W) approach. Critical current obtained for a 139 turn, made from a 14 m tape solenoidal coil with a ceramic former fabricated using the W-R procedure was 7 A, which generated a self-field of similar to 19 mT at 77 K. A test magnet system of overall I-c of 6.2 A (and corresponding field at 77 K of similar to 30 mT) has been constructed from double-pancake coils, also fabricated by the W-R procedure. Superconducting 'straps' were used to connect the double-pancakes. Based on its strength and thermal properties, alumina-based slurry has been found to be the best among those materials tested and has been used as an insulator for W-R HTS coils and magnets. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Superconduct Technol Ctr, Los Alamos, NM 87545 USA. RP Vo, NV (reprint author), Univ Calif Los Alamos Natl Lab, Superconduct Technol Ctr, MS-K763, Los Alamos, NM 87545 USA. NR 22 TC 5 Z9 5 U1 0 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 SEP PY 1998 VL 188 IS 1-2 BP 145 EP 152 DI 10.1016/S0304-8853(98)00177-2 PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 115ZV UT WOS:000075697200017 ER PT J AU Jia, QX Arendt, P Groves, JR Fan, Y Roper, JM Foltyn, SR AF Jia, QX Arendt, P Groves, JR Fan, Y Roper, JM Foltyn, SR TI Role of yttria-stabilized zirconia produced by ion-beam-assisted deposition on the properties of RuO2 on SiO2/Si SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID THIN-FILMS; ELECTRICAL-PROPERTIES; RUTHENIUM DIOXIDE; BOTTOM ELECTRODES; GROWTH; SI; HETEROSTRUCTURES; CAPACITORS; FATIGUE AB Highly conductive biaxially textured RuO2 thin films were deposited on technically important SiO2/Si substrates by pulsed laser deposition, where yttria-stabilized zirconia (YSZ) produced by ion-beam-assisted-deposition (IBAD) was used as a template to enhance the biaxial texture of RuO2 on SiO2/Si. The biaxially oriented RuO2 had a room-temperature resistivity of 37 mu Omega-cm and residual resistivity ratio above 2. We then deposited Ba0.5Sr0.5TiO3 thin films on RuO2/IBAD-YSZ/SiO2/Si. The Ba0.5Sr0.5TiO3 had a pure (111) orientation normal to the substrate surface and a dielectric constant above 360 at 100 kHz. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Jia, QX (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS K763, Los Alamos, NM 87545 USA. RI Jia, Q. X./C-5194-2008 NR 27 TC 2 Z9 2 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1998 VL 13 IS 9 BP 2461 EP 2464 DI 10.1557/JMR.1998.0344 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA 114RA UT WOS:000075621600018 ER PT J AU Hsueh, CH Sun, EY Becher, PF Plucknett, KP AF Hsueh, CH Sun, EY Becher, PF Plucknett, KP TI Crack profiles in applied moment double cantilever beam tests SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID WHISKER-REINFORCED ALUMINA; FRACTURE-RESISTANCE BEHAVIOR; R-CURVE RESPONSE; BRITTLE MATERIALS; MATRIX COMPOSITE; CERAMICS AB In situ observations of crack propagation in an applied moment double cantilever beam specimen were used previously to obtain the R-curve behavior of ceramic composites. To predict the R-curve using constitutive models, knowledge of the crack profile is required to derive the bridging stress distribution along the crack length and to analyze the toughening effect. To predict the crack profile in an applied moment double cantilever beam test, both the deformation of the crack surface due to the bending moment and the movement of the crack surface due to the rigid body motion of the loading fixture need to be considered. The analytical solution for the crack profile is derived in the present study. The predicted crack profiles agree well with experimental measurements. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Hsueh, CH (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 22 TC 1 Z9 1 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1998 VL 13 IS 9 BP 2539 EP 2546 DI 10.1557/JMR.1998.0354 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA 114RA UT WOS:000075621600028 ER PT J AU Sriram, MA McMichael, PH Waghray, A Kumta, PN Misture, S Wang, XL AF Sriram, MA McMichael, PH Waghray, A Kumta, PN Misture, S Wang, XL TI Chemical synthesis of the high-pressure cubic-spinel phase of ZnIn2S4 SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID TITANIUM DISULFIDE; GLASS-CERAMICS; CORDIERITE; POWDERS AB Chemical reactions conducted in solution are known to generate solid precursors containing molecular units that help in the formation of high-temperature phases. The structural units are created by controlling the molecular environments in solution, and as a result, phases that normally form and are stable at high temperatures can be synthesized at low or moderately elevated temperatures. However, the application of chemical approaches for synthesizing phases that normally form at high pressure are relatively unknown. In this work, a simple room-temperature aqueous chemical precipitation route has been used to synthesize the high-pressure cubic spinel modification of Znln(2)S(4). A solution coordination model (SCM) has been proposed to explain the formation of the high-pressure phase. The crystallinity, phase purity and phase transformation characteristics of the cubic phase have been studied using X-ray diffraction (XRD) including Rietveld refinement, transmission electron microscopy (TEM), and Auger electron microscopy (AEM). Results of these studies are discussed in the light of a proposed solution coordination model (SCM). (C) 1998 Kluwer Academic Publishers. C1 Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Sriram, MA (reprint author), Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA. EM kumta@emu.edu RI Wang, Xun-Li/C-9636-2010 OI Wang, Xun-Li/0000-0003-4060-8777 NR 41 TC 24 Z9 25 U1 2 U2 18 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 1 PY 1998 VL 33 IS 17 BP 4333 EP 4339 DI 10.1023/A:1004424629498 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA 183GQ UT WOS:000079546200008 ER PT J AU Kohn, MJ Valley, JW AF Kohn, MJ Valley, JW TI Effects of cation substitutions in garnet and pyroxene on equilibrium oxygen isotope fractionations SO JOURNAL OF METAMORPHIC GEOLOGY LA English DT Article DE cation substitutions; fractionations; garnet; oxygen isotopes; pyroxene ID GRANULITE FACIES METAMORPHISM; STABLE-ISOTOPE; CLOSURE TEMPERATURES; SELF-DIFFUSION; HIGH-PRECISION; ROCKS; MINERALS; THERMOMETRY; PRESSURE; ADIRONDACKS AB High-grade metamorphic rocks were used to explore oxygen isotope fractionations between pyroxene and garnet, and to investigate the effects on fractionation factors of the cation substitutions Fe3+Al-1 and Ca(Fe,Mg)(-1). Recrystallized, granulite facies (725 degrees C) wollastonite ores from the northern Adirondack highlands contain essentially only the minerals clinopyroxene (a Di-Hd solid solution)+ garnet (a Grs-Adr solid solution)+/- wollastonite, and exhibit a systematic dependence of measured fractionations on the Fe3+ content of calcic garnet: Delta(Cpx-CaGrt)=(0.14 +/- 0.12)+(0.78 +/- 0.20)X-Adr and Delta(Wo-CaGrt)=(0.15+/-0.22)+(0.57+/-0.33)X-Adr. In eclogites formed at T less than or equal to 650 degrees C: measured compositions of Ca-poor garnet and omphacite combined with experimental data indicate that Ca-poor, Fe-rich garnet is enriched in O-18 compared to both diopside and grossular: extrapolating to 1000 K, Delta(Alm-Di)approximate to c. 0.2% and Delta(Alm-Grs)approximate to c. 0.5%. Orthopyroxene and clinopyroxene from Gore Mountain, New York, show a constant fractionation that is independent of rock type, as expected if they have the same closure temperature. These data imply Delta(Opx-Cpx)Delta approximate to c. 0.7% at 1000 K. Measured fractionations among Ca-poor garnet, orthopyroxene, clinopyroxene and hornblende in the Gore Mountain rocks further indicate an O-18 enrichment in Ca-poor garnet over Grs (approximate to c. 0.5% at 1000 K). The new measurements are indistinguishable from expected equilibrium values based on experiments for the minerals enstatite, diopside, grossular, wollastonite and feldspar, but consistently indicate a significant isotope effect for the simple octahedral cation substitutions Fe3+ Al-1 (Grs vs. Adr) and Ca(Fe,Mg)(-1) (Ca-poor garnet vs. Grs; Opx vs. Cpx). Neither cation substitution has been directly investigated for its effect on O-18/O-16 fractionation with experiments in silicates. Chemical characterization of minerals is required prior to petrological interpretation of oxygen isotope trends. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA. RP Kohn, MJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. RI Valley, John/B-3466-2011; Kohn, Matthew/A-2562-2012 OI Valley, John/0000-0003-3530-2722; NR 59 TC 42 Z9 42 U1 3 U2 13 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0263-4929 J9 J METAMORPH GEOL JI J. Metamorph. Geol. PD SEP PY 1998 VL 16 IS 5 BP 625 EP 639 DI 10.1111/j.1525-1314.1998.00162.x PG 15 WC Geology SC Geology GA 105XM UT WOS:000075100700003 ER PT J AU Holman, HYN Perry, DL Hunter-Cevera, JC AF Holman, HYN Perry, DL Hunter-Cevera, JC TI Surface-enhanced infrared absorption-reflectance (SEIRA) microspectroscopy for bacteria localization on geologic material surfaces SO JOURNAL OF MICROBIOLOGICAL METHODS LA English DT Article DE endoliths; basalt; minerals; infrared spectroscopy; infrared microspectroscopy ID FT-IR SPECTROSCOPY; DEEP SUBSURFACE; MICROORGANISMS; INFORMATION; MONOLAYERS; MOLECULES; SURVIVAL; ROCK; TOOL AB Surface-enhanced infrared absorption-reflectance (SEIRA) microspectroscopy is potentially a useful chemical/biological probe to provide insights into the localization of living endolithic bacteria on the surfaces of geologic materials. This hypothesis was tested by validating and demonstrating the use of SEIRA with a metal-overlayer configuration ti, identify qualitatively on vesicular basalt surfaces the highly localized differences in the chemical composition and in the structure of clusters of endolithic bacteria, vesicles, and minerals. The metal-overlayer configuration was achieved by evaporating a thin gold-film on basalt specimen surfaces. Fourier-transform SEIRA microspectra of the specimen surfaces were recorded in the 650-4000 cm(-1) infrared region at a resolution of 4 cm(-1) on a Fourier-transform infrared spectrometer coupled to an infrared microscope. All bacteria-inhabiting surfaces exhibited infrared absorption bands indicative of bacterial cells, bands that became ideal biomarkers by which to detect the presence of bacteria. All basalt surfaces exhibited infrared absorption bands indicative of silicates, bands that became ideal mineral markers by which to detect the presence of silicate-containing minerals and locations of vesicles (gas-bubble cavities). Comparative analysis of space-resolved microspectra suggested that bacteria in the vesicular basalt lived not only on the vesicle surface but that they also penetrated and lived beneath the vesicle surface. The penetration terminated when calcic-plagioclase feldspar became the dominant constituent mineral in the vesicular basalt. With this experimental effort, the practical aspects and the usefulness of SEIRA as a promising tool to complement existing techniques for studying the in-situ localization of living bacteria in geologic materials have been demonstrated. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, EO Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Holman, HYN (reprint author), Univ Calif Berkeley, EO Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM hyholman@lbl.gov RI Holman, Hoi-Ying/N-8451-2014 OI Holman, Hoi-Ying/0000-0002-7534-2625 NR 43 TC 22 Z9 22 U1 0 U2 9 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 SEP PY 1998 VL 34 IS 1 BP 59 EP 71 DI 10.1016/S0167-7012(98)00069-4 PG 13 WC Biochemical Research Methods; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA 134GY UT WOS:000076736200008 ER PT J AU McBranch, DW Maniloff, ES Vacar, D Heeger, AJ AF McBranch, DW Maniloff, ES Vacar, D Heeger, AJ TI Ultrafast nonlinear optical properties of charge-transfer polymers: Transient holography and transient absorption studies SO JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS LA English DT Article DE pi-conjugated polymers; photoinduced charge transfer; transient absorption; holography ID PHOTOINDUCED ELECTRON-TRANSFER; CONJUGATED POLYMERS; STIMULATED-EMISSION; CONDUCTING POLYMERS; DYNAMIC HOLOGRAPHY; FILMS; POLY(P-PHENYLENEVINYLENE); STORAGE; SINGLET; DYE AB Charge-transfer polymers are a new class of nonlinear optical materials which can be used for generating femtosecond holographic gratings. Using semiconducting polymers sensitized with varying concentrations of C-60, holographic gratings were recorded by individual ultrafast laser pulses; the diffraction efficiency and time decay of the gratings were measured using nondegenerate four-wave mixing. Using a figure of merit for dynamic data processing, the temporal diffraction efficiency, this new class of materials exhibits between two and 12 orders of magnitude higher response than previous reports. The charge-transfer range at polymer/C-60 interfaces was further studied using transient absorption spectroscopy. The fact that charge transfer occurs in the picosecond-time scale in bilayer structures (thickness 200 Angstrom) implies that diffusion of localized excitations to the interface is not the dominant mechanism; the charge-transfer range is a significant fraction of the film thickness. El-om analysis of the excited state decay curves, we estimate the charge-transfer range to be 80 Angstrom and interpret that range as resulting from quantum delocalization of the photoexcitations. C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA. RP McBranch, DW (reprint author), Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Mail Stop J567, Los Alamos, NM 87545 USA. NR 46 TC 4 Z9 4 U1 1 U2 3 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-1991 J9 J NONLINEAR OPT PHYS JI J. Nonlinear Opt. Phys. Mater. PD SEP PY 1998 VL 7 IS 3 BP 313 EP 330 DI 10.1142/S0218863598000259 PG 18 WC Optics; Physics, Applied SC Optics; Physics GA 130HW UT WOS:000076515100001 ER PT J AU McDeavitt, SM Abraham, DP Park, JY AF McDeavitt, SM Abraham, DP Park, JY TI Evaluation of stainless steel zirconium alloys as high-level nuclear waste forms SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID ELECTROMETALLURGICAL TREATMENT; PHASE; FUEL; GLASSES AB Stainless steel-zirconium (SS-Zr) alloys have been developed for the consolidation and disposal of waste stainless steel, zirconium, and noble metal fission products such as Nb, Mo, Tc, Ru, Pd, and Ag recovered from spent nuclear fuel assemblies. These remnant waste metals are left behind following electrometallurgical treatment, a molten salt-based process being demonstrated by Argonne National Laboratory. Two SS-Zr compositions have been selected as baseline waste form alloys: (a) stainless steel-15 wt% zirconium (SS-15Zr) for stainless steel-clad fuels and (b) zirconium-8 wt% stainless steel (Zr-8SS) for Zircaloy-clad fuels. Simulated waste form. alloys were prepared and tested to characterize the metallurgy of SS-15Zr and Zr-8SS and to evaluate their physical properties and corrosion resistance. Both SS-15Zr and Zr-8SS have multi-phase microstructures, are mechanically strong, and have thermophysical properties comparable to other metals. They also exhibit high resistance to corrosion in simulated groundwater as determined by immersion, electrochemical, and vapor hydration tests. Taken together, the microstructure, physical property, and corrosion resistance data indicate that SS-15Zr and Zr-8SS are viable materials as high-level waste forms. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. RP McDeavitt, SM (reprint author), Argonne Natl Lab, Div Chem Technol, 9700 S Cass Ave,Bldg 205, Argonne, IL 60439 USA. EM mcdeavitt@cmt.anl.gov NR 45 TC 38 Z9 39 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1998 VL 257 IS 1 BP 21 EP 34 DI 10.1016/S0022-3115(98)00433-4 PG 14 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 132NR UT WOS:000076636900003 ER PT J AU Ladd, AJC Kinney, JH Haupt, DL Goldstein, SA AF Ladd, AJC Kinney, JH Haupt, DL Goldstein, SA TI Finite-element modeling of trabecular bone: Comparison with mechanical testing and determination of tissue modulus SO JOURNAL OF ORTHOPAEDIC RESEARCH LA English DT Article ID AGE-RELATED-CHANGES; ELASTIC PROPERTIES; SPECIMEN GEOMETRY; ARCHITECTURE; OSTEOPOROSIS; MICROSCOPY; BEHAVIOR; WIDTH AB We combined three techniques - mechanical testing, three-dimensional imaging, and finite-element modeling - to distinguish between the contributions of architecture and tissue modulus to mechanical function in human trabecular bone. The objectives of this study were 2-fold. The first was to assess the accuracy of micromechanical modeling of trabecular bone using high-contrast x-ray images of the trabecular architecture. The second was to combine finite-element calculations with mechanical testing to infer an average tissue modulus for the specimen. Specimens from five human L1 vertebrae were mechanically tested along the three anatomic axes. The specimens were then imaged by synchrotron x-ray tomography, and the elastic moduli of each specimen were calculated from the tomographic image by finite-element modeling. We found that 23-mu m tomographic images resolved sufficient structural detail such that the calculated anisotropy in the elastic modulus was within the uncertainties of the experimental measurements in all cases. The tissue modulus of each specimen was then estimated by comparing the calculated mean stiffness of the specimen, averaged over the three anatomical directions, with the experimental measurement. The absolute values of the experimental elastic constants could be fitted, again within the uncertainties of the experimental measurements, by a single tissue modulus of 6.6 GPa, which was the average tissue modulus of the five specimens. These observations suggest that a combination of mechanical testing, three-dimensional imaging, and finite-element modeling might enable the physiological variations in tissue moduli to be determined as a function of age and gender. C1 Univ Michigan, Orthopaed Res Labs, Ann Arbor, MI 48109 USA. Lawrence Livermore Natl Lab, Livermore, CA USA. RP Ladd, AJC (reprint author), Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA. EM ladd@che.ufl.edu NR 30 TC 103 Z9 104 U1 0 U2 9 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0736-0266 J9 J ORTHOP RES JI J. Orthop. Res. PD SEP PY 1998 VL 16 IS 5 BP 622 EP 628 DI 10.1002/jor.1100160516 PG 7 WC Orthopedics SC Orthopedics GA 136LZ UT WOS:000076861700015 PM 9820288 ER PT J AU Wang, PM Pitzer, KS Simonson, JM AF Wang, PM Pitzer, KS Simonson, JM TI Thermodynamic properties of aqueous magnesium chloride solutions from 250 to 600 K and to 100 MPa SO JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA LA English DT Article DE activity coefficient; apparent molar properties; aqueous solutions; density; enthalpy; heat capacity; magnesium chloride; osmotic coefficient; Pitzer equation; thermodynamics; vapor pressure ID MOLAR HEAT-CAPACITIES; ELEVATED-TEMPERATURES; ACTIVITY-COEFFICIENTS; ISOPIESTIC DETERMINATION; CALCIUM-CHLORIDE; OSMOTIC COEFFICIENTS; SALT SYSTEMS; MGCL2; 25-DEGREES-C; VOLUMES AB A new general model that describes the thermodynamic properties of MgCl2(aq) has been developed from a global fit to experimental results, including isopiestic molalities, vapor pressure measurements, freezing-point depressions, enthalpies of dilution, heat capacities, and densities, for this system. The model is based on a recent ion-interaction treatment with extended higher-order virial terms, and on experimental results from 240 to 627 K at pressures to 100 MPa and molalities to 25 mol . kg(-1). (C) 1998 American Institute of Physics and American Chemical Society. [S0047-2689(98)00305-5]. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wang, PM (reprint author), OLI Syst Inc, 108 Amer Rd, Morris Plains, NJ 07950 USA. EM pwang@olisystems.com NR 69 TC 33 Z9 34 U1 1 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0047-2689 J9 J PHYS CHEM REF DATA JI J. Phys. Chem. Ref. Data PD SEP-OCT PY 1998 VL 27 IS 5 BP 971 EP 991 PG 21 WC Chemistry, Multidisciplinary; Chemistry, Physical; Physics, Multidisciplinary SC Chemistry; Physics GA 125TG UT WOS:000076252700005 ER PT J AU Kurmaev, EZ Yarmoshenko, YM Neumann, M Stadler, S Ederer, DL Hase, I Fujimori, A Sato, M Yasui, Y Perera, RCC Grush, MM Callcott, TA Zatsepin, DA Trofimova, VA Sokolov, VV AF Kurmaev, EZ Yarmoshenko, YM Neumann, M Stadler, S Ederer, DL Hase, I Fujimori, A Sato, M Yasui, Y Perera, RCC Grush, MM Callcott, TA Zatsepin, DA Trofimova, VA Sokolov, VV TI Valence band spectra of BaCo1-xNixS2 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE inorganic compounds; photoelectron spectroscopy; electronic structure ID ADVANCED LIGHT-SOURCE; ELECTRONIC-STRUCTURE; TRANSPORT; BEAMLINE; BANIS2; SYSTEM AB The band properties of the quasi two-dimensional transition metal sulphide alloy system BaCo1-xNixS2 (x = 0, 0.1, 0.2, 0.5, 1.0) have been studied by X-ray photoelectron, X-ray absorption and X-ray fluorescence spectroscopy with tunable synchrotron radiation. It is found that the metallic character of the BaCo1-xNixS2 system increases with x in accordance with the results of transport property measurements. The S L-2,L-3 X-ray emission spectra show an excitation energy dependence which allowed separate mapping of the distribution of S(2) and S(1) + S(2) 3s3d partial density of states. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Russian Acad Sci, Inst Met Phys, Ural Div, Yekaterinburg 620219, Russia. Univ Osnabruck, Fachbereich Phys, D-49069 Osnabruck, Germany. Tulane Univ, Dept Phys, New Orleans, LA 70118 USA. Electrotech Lab, Tsukuba, Ibaraki 305, Japan. Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 113, Japan. Nagoya Univ, Dept Phys, Div Sci Mat, Chikusa Ku, Nagoya, Aichi 46401, Japan. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Russian Acad Sci, Inst Inorgan Chem, Siberian Div, Novosibirsk 630090, Russia. RP Kurmaev, EZ (reprint author), Russian Acad Sci, Inst Met Phys, Ural Div, Gsp 170, Yekaterinburg 620219, Russia. RI Yarmoshenko, Yuri/E-9531-2011; Kurmaev, Ernst/J-4254-2013; Zatsepin, Dmitry/F-5520-2012 OI Yarmoshenko, Yuri/0000-0001-8971-2052; Kurmaev, Ernst/0000-0003-4625-4930; NR 16 TC 5 Z9 5 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD SEP PY 1998 VL 59 IS 9 BP 1459 EP 1467 DI 10.1016/S0022-3697(98)00235-2 PG 9 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 135LG UT WOS:000076802700014 ER PT J AU Kohara, S Koura, N Idemoto, Y Takahashi, S Saboungi, ML Curtiss, LA AF Kohara, S Koura, N Idemoto, Y Takahashi, S Saboungi, ML Curtiss, LA TI The structure of LiKCO3 studied by ab initio calculations and Raman spectroscopy SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE inorganic compounds; Ab initio calculations; Raman spectroscopy ID MOLECULAR-DYNAMICS SIMULATION; ALKALI CARBONATES; DIFFRACTION AB The equilibrium structures of the LiKCO3 monomer and dimer were derived from ab initio calculations. The most stable cation site in the equilibrium structure of the LiKCO3 monomer is the 'edge' site of the CO32- ion, which is similar to our previous results for Li2CO3 and K2CO3. Moreover, the structure with Li at the 'edge' site and K at the 'corner' site was found to have a low energy. The vibrations of both these geometries were calculated and compared with the measured Raman spectrum for monoclinic LiKCO3. Harmonic vibrational frequencies derived from these geometries could not be assigned to the measured Raman bands, which showed split v(1) and v(3) bands. Therefore, the LiKCO3 dimer was examined. Harmonic vibrational frequencies derived from the equilibrium structure of LiKCO3 dimer showed two split v(1) bands and four v(3) bands which are in good agreement with the measured Raman spectrum. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Sci Univ Tokyo, Fac Sci & Technol, Dept Ind Chem, Noda, Chiba 2788510, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. Nisshin Steel Co Ltd, Steel & Technol Dev Lab, Chiba 2720011, Japan. RP Kohara, S (reprint author), Sci Univ Tokyo, Fac Sci & Technol, Dept Ind Chem, 2641 Yamazaki, Noda, Chiba 2788510, Japan. EM kohara@koura00.ci.nada.sut.ac.jp RI Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 12 TC 14 Z9 15 U1 1 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD SEP PY 1998 VL 59 IS 9 BP 1477 EP 1485 DI 10.1016/S0022-3697(98)00225-X PG 9 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 135LG UT WOS:000076802700017 ER PT J AU Johnson, CS Dees, DW Mansuetto, MF Thackeray, MM Vissers, DR Argyriou, D Loong, CK Christensen, L AF Johnson, CS Dees, DW Mansuetto, MF Thackeray, MM Vissers, DR Argyriou, D Loong, CK Christensen, L TI Structural and electrochemical studies of alpha-manganese dioxide (alpha-MnO2) (vol 68, pg 570, 1997) SO JOURNAL OF POWER SOURCES LA English DT Correction C1 Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. 3M Co, 3M Ctr, St Paul, MN 55144 USA. RP Johnson, CS (reprint author), Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 1 TC 13 Z9 13 U1 1 U2 16 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD SEP 1 PY 1998 VL 75 IS 1 BP 183 EP 184 PG 2 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA 121MX UT WOS:000076018600026 ER PT J AU Choueiri, E AF Choueiri, E TI Scaling of thrust in self-field magnetoplasmadynamic thrusters SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID PLASMA AB The magnetoplasmadynamic thruster (MPDT) has recently passed milestones in performance and lifetime that have prompted renewed interest in its unique advantages for energetic space missions. Mission and system studies, as well as ongoing performance characterization, require the use of simple relations for the scaling of performance parameters, The Maecker formula has long played such a role for the thrust of the self-field MPDT. The formula is shown to be too simplistic to account for the trends in measured thrust data that exhibit departures from the model, particularly at low current, We show that at high currents, the departures can be explained by the evolution of the current densities over the electrode surfaces that influence the spatial distribution of the volumetric Lorentz force densities. At low current levels the departures are attributed to the scaling of gasdynamic pressure distributions induced by the pinching components of the volumetric electromagnetic forces. The insight was used to formulate a more accurate empirically based model for the scaling of the thrust of an MPDT. C1 Princeton Univ, Elect Prop & Plasma Dynam Lab, Princeton, NJ 08544 USA. Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA. Princeton Univ, Dept Aerosp Engn & Mech, Appl Phys Grp, Princeton, NJ 08544 USA. RP Choueiri, E (reprint author), Princeton Univ, Elect Prop & Plasma Dynam Lab, Princeton, NJ 08544 USA. NR 38 TC 29 Z9 29 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 USA SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD SEP-OCT PY 1998 VL 14 IS 5 BP 744 EP 753 DI 10.2514/2.5337 PG 10 WC Engineering, Aerospace SC Engineering GA 146XB UT WOS:000077457200020 ER PT J AU Ward, WC Martinez, HE Abeyta, CL Morgan, AN Nelson, TO AF Ward, WC Martinez, HE Abeyta, CL Morgan, AN Nelson, TO TI Direct-scanning alpha-spectrometer for americium and plutonium contamination on highly-enriched uranium surfaces SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Trace Pu-239 and Am-241 contamination on a surface whose alpha count is dominated by U-235 and U-234 decay has been successfully quantified by counting swipes in external alpha-spectroscopy chambers. The swipe process, however, is labor intensive and subject to uncertainties in the swiping process as well as degraded spectral resolution due to the presence of the swipe material. A multichannel instrument for automated in situ measurements of interior and exterior contamination has been developed which incorporates a rotary table, 13 fixed ion-implanted silicon detectors, and spectroscopy electronics. Custom software was written to allow alpha-spectrometer to function as a virtual instrument in the LabView environment. This system gives improved speed and resolution as well as a complete log of the location of areas of high surface contamination, a feature not practical to obtain by other methods, and one which opens the possibility of long term studies such as Pu outgrowth evaluation employing the instrument. We present performance data as well as system integration, calibration, control and dynamic geometric efficiency calculations related to the design of this and next generation systems. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Ward, WC (reprint author), Univ Calif Los Alamos Natl Lab, MS-J576,MS-E510, Los Alamos, NM 87545 USA. NR 1 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 5 EP 10 DI 10.1007/BF02385928 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500001 ER PT J AU Kinard, WF Hunter, DB Clark, SB AF Kinard, WF Hunter, DB Clark, SB TI Applications of laser photoacoustic spectroscopy using an optical parametric oscillator to the study of complexation equilibria in dilute aqueous solutions SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A 30 Hz YAG laser pumped, narrow-line, optical parametric oscillator (OPO) has been used to investigate the chemical states of selected compounds in aqueous solution. The OPO system has the advantage that it can scan wavelengths over large ranges without significant loss of output power. The visible spectra of rare earth complexes in dilute aqueous solutions (as chemical analogs for the actinides) have been studied and preliminary qualitative results for erbium acetate complexes at the 100 micromolar level are in good agreement with literature data. Quantitative measurements of the protonation constant for phenol red at the 100 nanomolar level were measured. The particular implementation of the OPO system used in this work introduced a number of spectral artifacts due to optical signal overlap with near-infrared water absorption bands. In addition, it was demonstrated that the concentration limiting factor for photoacoustic spectroscopy is the intrinsic absorption of water in the visible region of the spectrum. C1 Coll Charleston, Dept Biochem & Chem, Charleston, SC 29424 USA. Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. Washington State Univ, Dept Chem, Pullman, WA 99164 USA. RP Kinard, WF (reprint author), Coll Charleston, Dept Biochem & Chem, Charleston, SC 29424 USA. EM kinardf@cofc.edu NR 17 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 11 EP 16 DI 10.1007/BF02385929 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500002 ER PT J AU Yarbro, SL Schreiber, SB Ortiz, EM Ames, RL AF Yarbro, SL Schreiber, SB Ortiz, EM Ames, RL TI Reducing Pu(IV) to Pu(III) with hydroxylamine in nitric acid solutions SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Los Alamos National Laboratory (LANL) has evaluated different techniques to concentrate and remove plutonium from solutions stored at the Rocky Flats Environmental Technology Site (RFETS). Pu(III) oxalate precipitation was chosen to treat nitric acid solutions because it is a simple and efficient technique for removing plutonium. Reducing Pu(IV) to Pu(III) is a key process step which affects the rest of the processing sequence. Because of differences in the literature(1) over the kinetics of the reaction, additional data was obtained and compared with existing data to examine the kinetic relationship, and determine an appropriate relationship for future engineering evaluations. The results and conclusions of this work, along with new experimental data, are presented. C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. RP Yarbro, SL (reprint author), Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 6 TC 9 Z9 12 U1 0 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 21 EP 24 DI 10.1007/BF02385931 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500004 ER PT J AU Berg, JM Veirs, DK Vaughn, RB Cisneros, MA Smith, CA AF Berg, JM Veirs, DK Vaughn, RB Cisneros, MA Smith, CA TI Plutonium(IV) mononitrate and dinitrate complex formation in acid solutions as a function of ionic strength SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Titrations of Pu(IV) with HNO3 in a series of aqueous HClO4 solutions ranging in ionic strength from 2 to 19 moral were followed using visible and near-infrared absorption spectrophotometry. The Pu 5f-5f spectra in the visible and near IR range change with complex formation. At each ionic strength, a series of spectra were obtained by varying nitrate concentration. Each series was deconvoluted into spectra of Pu4+(aq), Pu(NO3)(3+) and Pu(NO3)(2)(2+) complexes, and simultaneously their formation constants were determined. When corrected for the incomplete dissociation of nitric acid, the ionic strength dependence of each formation constant can be described by two parameters, beta(0) and Delta epsilon using the formulae of specific ion interaction theory. C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. RP Berg, JM (reprint author), Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 12 TC 14 Z9 14 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 25 EP 29 DI 10.1007/BF02385932 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500005 ER PT J AU Benicewicz, BC Jarvinen, GD Kathios, DJ Jorgensen, BS AF Benicewicz, BC Jarvinen, GD Kathios, DJ Jorgensen, BS TI Open-celled polymeric foam monoliths for heavy metal separations study SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID IN-OIL EMULSIONS; POLYSTYRENE AB Open-celled polymeric foam monoliths prepared by high internal phase emulsion polymerization (HIPE) are being investigated as improved materials for separation of heavy metals. In column flow studies, the foam monoliths have high flow rates and are durable up to at feast 40 psi. A 4-vinylpyridine functionality has been incorporated into vinylbenzylchloride/styrene copolymer foams by graft-polymerization of vinylpyridine. The open structure of the foam and the flexible graft-polymerized ion-exchange chains result in improved kinetics in metal uptake. Iron uptake kinetics were greatly increased in the grafted foams over resin beads of similar structure. Plutonium uptake kinetics were moderately increased in the foams. C1 Rensselaer Polytech Inst, Troy, NY 12180 USA. Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Benicewicz, BC (reprint author), Rensselaer Polytech Inst, Troy, NY 12180 USA. OI Benicewicz, Brian/0000-0003-4130-1232 NR 13 TC 40 Z9 40 U1 4 U2 20 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 31 EP 35 DI 10.1007/BF02385933 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500006 ER PT J AU Marsh, SF Jarvinen, GD Bartsch, RA Nam, J Barr, ME AF Marsh, SF Jarvinen, GD Bartsch, RA Nam, J Barr, ME TI New bifunctional anion-exchange resins for nuclear waste treatment SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Additional(1) bifunctional: anion-exchange resins have been designed, synthesized and evaluated for their ability to take up Pu(IV) from nitric acid solutions. Bifunctionality is achieved by adding a second anion-exchange site to the pyridine nitrogen (also an anion-exchange site) of the base poly(4-vinylpyridine) resin. Previous work focused on the effect of varying the chemical properties of the added site along with the length of an alkylene 'spacer' between the two sites. Here we examine four new 3- and 4-picolyl derivatives which maintain more rigidly defined geometries between the two nitrogen cationic sites. These materials, which have the two anion-exchange sites separated by three and four carbons, respectively, exhibit lower overall Pu(IV) distribution coefficients than the corresponding N-alkylenepyridium derivatives with more flexible spacers. Methylation of the second pyridium site results in a ca. 20% increase in the Pu(IV) distribution coefficients. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA. RP Marsh, SF (reprint author), Univ Calif Los Alamos Natl Lab, MS E510, Los Alamos, NM 87545 USA. NR 8 TC 8 Z9 8 U1 1 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 37 EP 40 DI 10.1007/BF02385934 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500007 ER PT J AU Blau, MS AF Blau, MS TI Zone refining of plutonium metal SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB An experiment demonstrated the possibility of developing a zone refining process that would produce the first plutonium metal of extremely high purity. Plutonium rods containing known amounts of impurities were melted inside tantalum boats and passed horizontally through a three-turn, high-frequency coil so as to cause a narrow molten zone to pass through each rod 10 times. The impurity elements cobalt, chromium, iron, nickel, neptunium, and uranium moved in the same direction as the molten zone, as predicted; the elements aluminum, americium, and gallium moved in the opposite direction of the molten zone, as predicted. As the impure alloy was zone refined, delta-phase plutonium metal crystals formed. C1 Univ Calif Los Alamos Natl Lab, Adv Technol Grp, Los Alamos, NM 87545 USA. RP Blau, MS (reprint author), Univ Calif Los Alamos Natl Lab, Adv Technol Grp, MS E510, Los Alamos, NM 87545 USA. NR 5 TC 1 Z9 1 U1 3 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 41 EP 45 DI 10.1007/BF02385935 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500008 ER PT J AU Bowyer, TW Abel, KH Hubbard, CW McKinnon, AD Panisko, ME Perkins, RW Reeder, PL Thompson, RC Warner, RA AF Bowyer, TW Abel, KH Hubbard, CW McKinnon, AD Panisko, ME Perkins, RW Reeder, PL Thompson, RC Warner, RA TI Automated separation and measurement of radioxenon for the Comprehensive Test Ban Treaty SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A fully automatic radioxenon sampler/analyzer (ARSA) has been developed and demonstrated for the collection and quantitative measurement of the four xenon radionuclides, Xe-131m(11.9 d), Xe-133m(2.2 d), (133Xe)(5.2 d), and Xe-135(9.1 hr), in the atmosphere. These radionuclides are important signatures in monitoring for compliance to a Comprehensive Test Ban Treaty (CTBT). Activity ratios of these radionuclides permit source attribution. Xenon, continuously and automatically separated from the atmosphere. is automatically analyzed by electron-photon coincidence spectrometry providing a lower limit of detection of about 100 mu Bq/m(3). The demonstrated detection limit is about 100 times better than achievable with reported laboratory-based procedures for the short-time collection intervals of interest. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Bowyer, TW (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. OI McKinnon, Archibald/0000-0002-3963-783X NR 7 TC 26 Z9 30 U1 0 U2 4 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 77 EP 81 DI 10.1007/BF02385941 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500014 ER PT J AU Miley, HS Bowyer, SM Hubbard, CW McKinnon, AD Perkins, RW Thompson, RC Warner, RA AF Miley, HS Bowyer, SM Hubbard, CW McKinnon, AD Perkins, RW Thompson, RC Warner, RA TI A description of the DOE radionuclide aerosol sampler/analyzer for the Comprehensive Test Ban Treaty SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Radionuclide monitoring, though slower than vibrational methods of explosion detection, provides a basic and certain component of Comprehensive Test Ban Treaty (CTBT) verification. Measurement of aerosol radioactive debris, specifically a suite of shea-lived fission products. gives high confidence that a nuclear weapon has been detonated in or vented to the atmosphere. The variable nature of wind-borne transport of the debris requires that many monitoring stations cover the globe to insure a high degree of confidence that tests which vent to the atmosphere will be detected within a reasonable time period. To fulfill the CTBT aerosol measurement requirements, a system has been developed at PNNL to automatically collect and measure radioactive aerosol debris, then communicate spectral data to a central data center. This development has proceeded through several design iterations which began with sufficient measurement capability (<30 mu Bq/m(3) Ba-140) and resulted in a system with a minimal footprint (1 mx2 m), minimal power requirement (1600W), and support of network infrastructure needs. The Mark IV prototype (Fig. 1) is currently the subject of an Air Force procurement with private industry to partially fulfill US treaty obligations under the CTBT. It is planned that the system will be available for purchase from a manufacturer in late 1997. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Miley, HS (reprint author), Pacific NW Lab, Battelle Blvd, Richland, WA 99352 USA. OI McKinnon, Archibald/0000-0002-3963-783X NR 7 TC 13 Z9 13 U1 1 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 83 EP 87 DI 10.1007/BF02385942 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500015 ER PT J AU Reeder, PL Bowyer, TW Perkins, RW AF Reeder, PL Bowyer, TW Perkins, RW TI Beta-gamma counting system for Xe fission products SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A beta-gamma coincidence counting system has been developed for automated analysis of Xe gas samples separated from air. The Xe gas samples are contained in a cylindrical plastic scintillator cell located between two NaI(Tl) scintillation detectors. The X-ray and gamma spectra gated by coincident events in the plastic scintillator cell are recorded for each NaI(Tl) crystal. The characteristic signatures of the Xe-131m, Xe-133g, Xe-133m, and Xe-135g isotopes of interest for nuclear test-ban verification as well as the procedures and results of absolute efficiency measurements are described. A NaI(Tl) crystal with provision for 4 sample cells has been implemented for the system to be deployed in the field. Examples of data on ambient air samples in New York City obtained with the field prototype are presented. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Reeder, PL (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 4 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 89 EP 94 DI 10.1007/BF02385943 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500016 ER PT J AU Smart, JE AF Smart, JE TI Real-time airborne radiation analysis and collection (RTARAC) searching for airborne species characteristic to nuclear proliferation SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB An effective means of detecting airborne radioactive aerosol plumes has been developed and tested on aircraft platforms. The Real-Time Airborne Radiation Analysis and Collection (RTARAC) system was mounted in the wing pod of a Navy P-3 where it sampled 20 cubic meters of air per minute on each of eleven sequentially advanced filters. A 140% intrinsic germanium detector counted radioactive particles collected on the 15 cm circular filters in real-time. Gamma-energy spectrum and near real-time analysis of the sample were displayed on a laptop computer. C1 Pacific NW Lab, Radiat Instrumentat & Applicat Grp, Richland, WA 99352 USA. RP Smart, JE (reprint author), Pacific NW Lab, Radiat Instrumentat & Applicat Grp, POB 999, Richland, WA 99352 USA. NR 1 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 105 EP 108 DI 10.1007/BF02385945 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500018 ER PT J AU Geelhood, BD AF Geelhood, BD TI Analysis of gamma-ray spectra from an aircraft-mounted array of high-resolution sensors SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Gamma-ray spectra have been collected using the Environmental Radionuclide Sensor System.(2) Twenty aircraft-mounted, high-purity germanium sensors are utilized to collect high-resolution environmental spectra. Since time-over-target is limited for aerial surveys, one must often attempt to glean the maximum quantity of information from low-count spectra. The spectral data are collected in a time-stamped-list-mode, which time tags every gamma-ray. This allows a gamma-ray spectrum to be built without dilution for only the time-over-target. The analysis package utilizes photopeaks from natural background isotopes to autocalibrate and gain shift the individual spectra into a composite spectrum. The analysis software utilizes several unique techniques to robustly analyze low-count spectra Tt carefully determines the spectral baseline, finds all the peaks which differ from the baseline by more than 4-standard deviations, uses a binary-search technique to fit Gaussian peaks, and utilizes a large library to identify peaks (including minor and escape peaks). Although in an aerial survey, the source geometry is often unknown or difficult to model, the software attempts to assign consistent source strengths to radionuclides. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Geelhood, BD (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 1 TC 1 Z9 1 U1 2 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 109 EP 114 DI 10.1007/BF02385946 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500019 ER PT J AU McKinnon, AD Bowyer, SM Hubbard, CW Miley, HS Perkins, RW Thompson, RC Warner, RA AF McKinnon, AD Bowyer, SM Hubbard, CW Miley, HS Perkins, RW Thompson, RC Warner, RA TI Environmental measurements with a comprehensive Nuclear Test Ban Treaty radionuclide particulate monitor SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A Radionuclide Aerosol Sampler/Analyzer (RASA Mark 4) has been developed at PNNL for use in verifying the Comprehensive Nuclear Test Ban Treaty (CTBT). The RASA Mark 4 collects about 20,000 m(3) of air per day on a 0.25 m(2) filter. This filter is automatically decayed for 24 hours, then advanced to a germanium detector for a 24 hour count. This system has been operated in Richland WA for a limited period of time in a predeployment testing phase. The germanium-detector gamma-ray spectra have been analyzed by automatic spectral analysis codes to determine Minimum Detectable Concentrations (MDC) for a number of isotopes of interest. These MDC's have been compared to other atmospheric measurements in the field and in the laboratory. C1 Pacific NW Lab, Richland, WA 99352 USA. RP McKinnon, AD (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. OI McKinnon, Archibald/0000-0002-3963-783X NR 2 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 115 EP 119 DI 10.1007/BF02385947 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500020 ER PT J AU Bowyer, SM Gerlach, DC Miley, HS Pratt, SL Thomas, CW Wacker, JF Kniedler, MJ AF Bowyer, SM Gerlach, DC Miley, HS Pratt, SL Thomas, CW Wacker, JF Kniedler, MJ TI Radiochemistry of the 3M SBMF-40VF filter media used by the DOE CTBT Radionuclide Aerosol Sampler/Analyzer (RASA) SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB The Comprehensive Test Ban Treaty calls for the monitoring of aerosol radionuclides throughout the globe. Pacific Northwest National Laboratory has developed the Radionuclide Aerosol Sampler/Analyzer (RASA) for the Department of Energy to automatically collect and measure radioactive aerosols from the atmosphere. The RASA passes high volumes of air through a 3M(TM) Substrate Blown Microfiber Media (SBMF) specifically designated as SBMF-40VF. It then automatically moves the filter media in front of a high-purity germanium detector and collects a gamma spectrum. If further analysis on the filter is desired, the filter is sent to a laboratory and radiochemical analysis is performed. This paper discusses the method of dissolution of the SBMF-40VF filter media and the separation of the radioisotopes of interest. C1 Pacific NW Lab, Richland, WA 99352 USA. TMA, AFTAC, Patrick AFB, FL 32925 USA. RP Bowyer, SM (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 2 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 121 EP 124 DI 10.1007/BF02385948 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500021 ER PT J AU Jardine, LJ Peddicord, KL Witmer, FE Krumpe, PF Lazarev, L Moshkov, M AF Jardine, LJ Peddicord, KL Witmer, FE Krumpe, PF Lazarev, L Moshkov, M TI Reducing nuclear danger through intergovernmental technical exchanges on nuclear materials safety management SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB The United States (U.S.) and Russia are dismantling nuclear weapons and generating hundreds of tons of excess plutonium and high-enriched uranium fissile nuclear materials that require disposition. The U.S. Department of Energy and the Ministry of the Russian Federation for Atomic Energy (Minatom) organizations are planning and implementing safe, secure storage and disposition operations for these materials in numerous facilities. This provides a new opportunity for technical exchanges between Russian and U.S. scientists that can establish an improved and sustained common safety culture for handling these materials. An initiative that develops and uses personal relationships and joint projects among Russian and U.S. participants involved in nuclear materials safety management contributes to improving nuclear materials nonproliferation and to making a safer world. Technical exchanges and workshops are being used to systematically identify opportunities in the nuclear materials facilities to improve and ensure the safety of workers, the public, and the environment. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Texas A&M Univ, Zachry Engn Ctr 129, College Stn, TX 77843 USA. US DOE, Def Program, Germantown, MD 20874 USA. VG Khlopin Radium Inst, Foreign Relat Dept, St Petersburg 194021, Russia. RP Jardine, LJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-195, Livermore, CA 94551 USA. NR 2 TC 0 Z9 0 U1 1 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 125 EP 127 DI 10.1007/BF02385949 PG 3 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500022 ER PT J AU Grant, PM Moody, KJ Hutcheon, ID Phinney, DL Whipple, RE Haas, JS Alcaraz, A Andrews, JE Klunder, GL Russo, RE Fickies, TE Pelkey, GE Andresen, BD Kruchten, DA Cantlin, S AF Grant, PM Moody, KJ Hutcheon, ID Phinney, DL Whipple, RE Haas, JS Alcaraz, A Andrews, JE Klunder, GL Russo, RE Fickies, TE Pelkey, GE Andresen, BD Kruchten, DA Cantlin, S TI Nuclear forensics in law enforcement applications SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Over the past several years, the Livermore Forensic Science Center has conducted analyses of nuclear-related samples in conjunction with domestic and international criminal investigations. Law enforcement officials have sought conventional and nuclear-forensic analyses of questioned specimens that have typically consisted of miscellaneous metal species or actinide salts. The investigated activities have included nuclear smuggling and the proliferation of alleged fissionable materials, nonradioactive hoaxes such as "Red Mercury," and the interdiction of illegal laboratories engaged in methamphetamine synthesis. C1 Univ Calif Lawrence Livermore Natl Lab, Forens Sci Ctr, Livermore, CA 94550 USA. RP Grant, PM (reprint author), Univ Calif Lawrence Livermore Natl Lab, Forens Sci Ctr, L-178, Livermore, CA 94550 USA. NR 10 TC 12 Z9 12 U1 1 U2 11 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 129 EP 132 DI 10.1007/BF02385950 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500023 ER PT J AU Shebell, P Hutter, AR AF Shebell, P Hutter, AR TI Environmental radiation and radioactivity in the vicinity of the Semipalatinsk Test Site SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB The International Atomic Energy Agency's Mission to Kazakhstan studied the present environmental contamination and the exposure risk from nuclear tests performed at the Semipalatinsk Test Site. On this mission, EML scientists collected in-situ gamma-ray spectra, measured external gamma dose rates, and collected soil samples. With the exception of plowshare areas and near ground zero, all the areas visited had external dose rates within typical environmental levels. Measurements within a 15 km radius of ground zero showed elevated levels of Cs-137, Eu-152, and Co-60. The dose rate within similar to 1 km of ground zero ranged from 500 to 30000 nGy.h(-1). C1 US DOE, Environm Measurements Lab, New York, NY 10014 USA. RP Shebell, P (reprint author), US DOE, Environm Measurements Lab, New York, NY 10014 USA. NR 8 TC 8 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 133 EP 138 DI 10.1007/BF02385951 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500024 ER PT J AU Smith, DK AF Smith, DK TI A recent drilling program to investigate radionuclide migration at the Nevada Test Site SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID NUCLEAR TEST CAVITY AB Recent drilling affords new opportunities to investigate the occurrence, distribution, and transport of radionuclides above and below the water table at the Nevada Test Site (NTS), Nye County, Nevada. This program is unique because of elevated levels of radioactivity encountered during drilling (>3.7E+6 Bq/l H-3), extreme completion depths (>950 m), and the expense of constructing new wells (>$1E+6/borehole). Sites of five nuclear tests have been drilled. Three of the events were fired in Yucca Flat which is a hydrologically closed basin and two were fired in fractured volcanics of Pahute Mesa. Results from Yucca Flat indicate that volatile and refractory radionuclides, fractionated at zero time, ate not highly mobile under saturated conditions. In contrast, boreholes completed on Pahute Mesa intercept high concentrations of tritium (>3.7E+6 Bq/l H-3) and other radionuclides transported more than 300 m from event cavities as disserved species or as colloids. C1 Univ Calif Lawrence Livermore Natl Lab, Isotope Sci Div, Livermore, CA 94550 USA. RP Smith, DK (reprint author), Univ Calif Lawrence Livermore Natl Lab, Isotope Sci Div, Livermore, CA 94550 USA. NR 25 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 159 EP 166 DI 10.1007/BF02385955 PG 8 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500028 ER PT J AU Hinton, TG Malek, MA Sherony, C Clark, SB AF Hinton, TG Malek, MA Sherony, C Clark, SB TI Operationally defined availability from sequential extractions compared to plant uptake of Cs-137 and Sr-90 SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID SOIL TYPES; MOBILITY; BIOAVAILABILITY; SPECIATION; BYELARUS; UKRAINE; RUSSIA; CROPS AB The operationally defined bioavailable fraction from a commonly used sequential extraction (SE) procedure was compared to biological availability represented by plant uptake of Cs-137 and Sr-90. Experiments were conducted at two locations in the Ukraine and at several field locations on the Savannah River Site, South Carolina. A significant regression existed between plant uptake and the ammonium acetate fraction (r(2) = 0.65), however, ratios of predicted uptake from the SE procedure to observed plant uptake ranged from 0.03 to 5.2. Data suggest that the SE procedure was useful for qualitative interpretations of biological availability but lacked sufficient rigor to be useful for quantitative predictions. C1 Savannah River Ecol Lab, Aiken, SC 29802 USA. Washington State Univ, Dept Environm Chem, Pullman, WA 99164 USA. RP Hinton, TG (reprint author), Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 22 TC 11 Z9 12 U1 0 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 185 EP 190 DI 10.1007/BF02385959 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500032 ER PT J AU Failor, R Belovodsky, L Gaevoy, V Golubev, A AF Failor, R Belovodsky, L Gaevoy, V Golubev, A TI Method for rapid tritiated water extraction from environmental samples SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB We have developed a thermal vacuum desorption process to rapidly extract water from environmental samples for tritium analysis. Thermal vacuum desorption allows for extraction of the moisture from the sample within a few hours in a form and quantity suitable far liquid scintillation counting and allows detection of tritium at the levels of <2 Bq/l of milk, <0.5 Bq/g of vegetation, and <0.5 Bq/g of soil. We developed a prototype unit that can process batches of twenty or more samples within 24 hours. Early data shows that a high percentage of water is extracted reproducibly without enrichment or depletion of the tritium content. The quench coefficient of the extracted water is low allowing for accurate, direct liquid scintillation counting. In most samples, good comparison has been observed with results using freeze-dry lyophilization as the water extraction method. C1 Univ Calif Lawrence Livermore Natl Lab, Safety Labs Div, Livermore, CA 94550 USA. All Russian Sci Res Inst Expt Phys, Russian Fed Nucl Ctr, Arzamas 16, Russia. RP Failor, R (reprint author), Univ Calif Lawrence Livermore Natl Lab, Safety Labs Div, Livermore, CA 94550 USA. NR 4 TC 1 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 201 EP 206 DI 10.1007/BF02385962 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500035 ER PT J AU Wolf, SF AF Wolf, SF TI Application of instrumental radioanalytical techniques to nuclear waste testing and characterization SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID SPECTROMETRY; PLUTONIUM AB This paper describes the validation of a multi-technique analytical methodology that uses inductively coupled plasma-mass spectrometry, a-spectrometry, and gamma-spectrometry for the routine analysis of samples containing transuranic radionuclides. This methodology is capable of the determination of concentrations bf both Pu-238 and Pu-241 in the presence of U-238 and Am-241 without the need for chemical separations. The relative merits of these three techniques were evaluated as they are applied in a nuclear waste material and spent nuclear fuel testing program by analyzing (1) standards and (2) solutions prepared from the dissolution of glasses doped with Np-237, Pu-239, and Am-241. The uncertainty associated with each technique was within +/-4% for standards and +/-10% for doped nuclear waste glasses. The methodology was then used to analyze three fully radioactive waste glasses. C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. RP Wolf, SF (reprint author), Argonne Natl Lab, Div Chem Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 9 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 207 EP 212 DI 10.1007/BF02385963 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500036 ER PT J AU Sandoval, W Cournoyer, ME Bustos, L Quintana, D Ortega, L AF Sandoval, W Cournoyer, ME Bustos, L Quintana, D Ortega, L TI A new waste minimization method for the determination of total nonhalogenated volatile organic compounds in TRU wastes SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB As part of the technical support CST-12 provides for a:wide variety of defense and nondefense programs within Los Alamos National Laboratory (LANL) and the Department of Energy (DOE) complex, new waste minimization technique is under development for radiological volatile organic analysis (Hot VOA). Currently all Hot VOA must be run in a glovebox. Several types of samples contain TRU radiological waste in the form of particulates. By prefiltering the samples through a 1.2 micron syringe and counting the radioactivity it has been found that many of the samples can be analyzed outside of a glovebox. In the present investigation, the types of Hot VOA samples that can take advantage of this new technique, the volume and types of waste reduced and the experimental parameters will he discussed. Overall the radioactive waste generated is minimized. C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RP Sandoval, W (reprint author), Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, MS G740, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 221 EP 224 DI 10.1007/BF02385965 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500038 ER PT J AU Hollis, WK Velarde, K Lashley, J Bustos, L Cournoyer, M Villarreal, R AF Hollis, WK Velarde, K Lashley, J Bustos, L Cournoyer, M Villarreal, R TI Gas generation from contact of radioactive waste and brine SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB Defense related activities have produced a legacy of waste that must now be addressed. Temporary storage of the waste presents a great risk to the environment from potential release of radioactive material. This has resulted in the need fora permanent waste repository. One aspect to verify that a permanent repository is feasible is to study the effects of radioactive waste when integrated into the disposal environment Specific studies have been performed that study the gas generated from the direct contact of possible repository brine and radioactive waste. Four factors have been identified which influence the production of gases: radiolysis, microbial activity, corrosion, and evolved residual gas. The influence of these variables on the relative rates and total quantity of gases generated from waste contacted by brine are presented. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hollis, WK (reprint author), Univ Calif Los Alamos Natl Lab, MS G740, Los Alamos, NM 87545 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD SEP PY 1998 VL 235 IS 1-2 BP 235 EP 239 DI 10.1007/BF02385968 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 127YN UT WOS:000076378500041 ER PT J AU Sugama, T AF Sugama, T TI Yttrium acetate-derived particle coatings for mitigating oxidation and corrosion of Inconel 625 SO JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY LA English DT Article DE yttrium acetate precursor; particle coating; oxidation; corrosion; Inconel ID SOL-GEL PROCESS; THIN-FILMS; XPS AB "Sol paint" that yields yttrium-based compounds was prepared by mixing four chemical ingredients, yttrium acetate tetrahydrate precursor, diethanolamine, isopropyl alcohol, and hydrochloric acid, and then applied as oxidation/corrosion resistant coatings for Inconel 625 substrates. Annealing the coatings at 500 degrees C developed a coalescent microstructure of coarse particles consisting of amorphous yttrium carbonate as the major component and crystalline yttrium oxide (Y2O3) as the minor one. At 700 degrees C, the yttrium carbonate was transformed into Y2O3 by decarbonation. Increasing the annealing temperature to 900 degrees C led to the formation of the YCrO3 phase yielded by interaction between Y2O3 and the Cr2O3 which had arisen from the oxidation of the underlying Inconel; the YCrO3 phase created a particle coating with a densified microstructure. There were two key factors in mitigating the degree of oxidation of Inconel at 900 degrees C in air: (1) an uptake of oxygen by Y2O3 in the coatings, and (2) a densified coating layer that suppresses the diffusion and permeation of oxygen through it. Furthermore, inhibiting the rate of NaCl-caused corrosion was not only due to the excellent coverage of particle coatings over the entire surfaces of the substrates, but also may be associated with a good adherence of the coatings to the substrates. C1 Brookhaven Natl Lab, Dept Appl Sci, Energy Efficiency & Conservat Div, Upton, NY 11973 USA. RP Sugama, T (reprint author), Brookhaven Natl Lab, Dept Appl Sci, Energy Efficiency & Conservat Div, Upton, NY 11973 USA. NR 25 TC 3 Z9 4 U1 2 U2 10 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0928-0707 J9 J SOL-GEL SCI TECHN JI J. Sol-Gel Sci. Technol. PD SEP PY 1998 VL 12 IS 1 BP 35 EP 48 DI 10.1023/A:1008653026137 PG 14 WC Materials Science, Ceramics SC Materials Science GA 129MV UT WOS:000076468300004 ER PT J AU Fedorov, VV Montepiedra, G Nachtsheim, CJ AF Fedorov, VV Montepiedra, G Nachtsheim, CJ TI Optimal design and the model validity range SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE model validity; D-optimality; first-order iterative algorithm; linear regression; mean squared error; model-robust design AB A class of model-robust optimal designs, based on an extension of the standard optimality criteria to cases where there exist some prior information on the validity of a response function, is considered, Under this set-up, the concept of the "model validity range" is introduced and explored. A necessary condition for optimality is obtained for the determinant criterion (D-optimality in the classical case). A modified version of this criterion is proposed and discussed. The corresponding results provide upper and low bounds for the original problem and help to construct approximate solutions, when contamination is relatively small. Optimal designs for simple but commonly used regression models are obtained and studied. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Bowling Green State Univ, Bowling Green, OH 43403 USA. Univ Minnesota, Minneapolis, MN 55455 USA. NR 10 TC 4 Z9 4 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD SEP 1 PY 1998 VL 72 IS 1-2 BP 215 EP 227 DI 10.1016/S0378-3758(98)00033-0 PG 13 WC Statistics & Probability SC Mathematics GA 130NW UT WOS:000076527000016 ER PT J AU Taha, H Konopacki, S Akbari, H AF Taha, H Konopacki, S Akbari, H TI Impacts of lowered urban air temperatures on precursor emission and ozone air quality SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID VEGETATION; ALBEDO; MODEL; BASIN AB Meteorological, photochemical, building-energy, and power plant simulations were performed to assess the possible precursor emission and ozone air quality impacts of decreased air temperatures tl-lat could result from implementing the "cool communities" concept in California's South Coast Air Basin (SoCAB). Two pathways are considered. In the direct pathway, a reduction in cooling energy use translates into reduced demand for generation capacity and, thus, reduced precursor emissions from electric utility power plants. In the indirect pathway, reduced air temperatures can slow the atmospheric production of ozone as well as precursor emission from anthropogenic and biogenic sources. The simulations suggest small impacts on emissions following implementation of cool communities in the SoCAB. In summer, for example, there can be reductions of up to 3% in NOx emissions from in-basin power plants. The photochemical simulations suggest that the air quality impacts of these direct emission reductions are small. However, the indirect atmospheric effects of cool communities can be significant. For example, ozone peak concentrations can decrease by up to 11% in summer and population-weighted exceedance exposure to ozone above the California and National Ambient Air Quality Standards can decrease by up to 11 and 17%, respectively. The modeling suggests that if these strategies are combined with others, such as mobile-source emission control, the improvements in ozone air quality can be substantial. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RP Taha, H (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, MS 90-2000, Berkeley, CA 94720 USA. EM hgtaha@lbl.gov NR 21 TC 11 Z9 16 U1 0 U2 0 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA ONE GATEWAY CENTER, THIRD FL, PITTSBURGH, PA 15222 USA SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD SEP PY 1998 VL 48 IS 9 BP 860 EP 865 PG 6 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 123XG UT WOS:000076150500009 PM 28076196 ER PT J AU Rebillat, F Lamon, J Naslain, R Lara-Curzio, E Ferber, MK Theodore, M AF Rebillat, F Lamon, J Naslain, R Lara-Curzio, E Ferber, MK Theodore, M TI Properties of multilayered interphases in SiC/SiC chemical-vapor-infiltrated composites with "weak" and "strong" interfaces SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID BRITTLE-MATRIX COMPOSITES; MECHANICAL-PROPERTIES; CERAMIC COMPOSITES; ROUGHNESS; STRESSES; FRICTION; FIBERS AB The interfacial properties of SiC/SiC composites with interphases that consist of (C-SIC) sequences deposited on the fibers have been determined by single-fiber push-out tests. The matrix has been reinforced with either as-received or treated Nicalon fibers. The measured interfacial properties are correlated with the fiber-coating bond strength and the number of interlayers. For the composites reinforced with as-received (weakly bonded) fibers, interfacial characteristics are extracted from the nonlinear portion of the stress-displacement curve by fitting Hsueh's push-out model. The interfacial characteristics are controlled by the carbon layer adjacent to the fiber. The resistance to interface crack growth and fiber sliding increases as the number of (C-SiC) sequences increases. For the composites reinforced with treated (strongly bonded) fibers, the push-out curves exhibit an uncommon upward curvature, which reflects different modes of interphase cracking and a contribution of fiber roughness. C1 UB1, SEP, LCTS, CNRS,UMR 5801, F-33600 Pessac, France. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Rebillat, F (reprint author), UB1, SEP, LCTS, CNRS,UMR 5801, F-33600 Pessac, France. NR 33 TC 62 Z9 65 U1 4 U2 24 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1998 VL 81 IS 9 BP 2315 EP 2326 PG 12 WC Materials Science, Ceramics SC Materials Science GA 121AB UT WOS:000075989000013 ER PT J AU Saiz, E Tomsia, AP AF Saiz, E Tomsia, AP TI Kinetics of metal-ceramic composite formation by reactive penetration of silicates with molten aluminum SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SYSTEM; MICROSTRUCTURE; INFILTRATION; MODEL AB Wetting and reactions between molten Al and silicate substrates (particularly mullite) are studied to determine both how substrate density and p(O-2) influence wetting behavior, reaction rates, composition, and reaction product microstructure and what key steps control penetration kinetics. Guidelines are provided for using reactive penetration or infiltration when fabricating metal/ceramic composites. For dense substrates, a reactive penetration process occurs. For a certain range, the chemical reaction between Al and the ceramic is a limiting kinetic step resulting in fast reaction rates. Maximum dense mullite substrate reaction rates are between 1000 degrees and 1200 degrees C independent of p(O-2), unlike fused silica, which has faster penetration rates at higher temperatures. For mullite, reaction layer microstructure evolution halts reaction at higher temperatures, For porous substrates, reactive infiltration alone occurs. Either a critical temperature or p(O-2) must be reached before infiltration starts. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. NR 42 TC 51 Z9 53 U1 1 U2 7 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0002-7820 EI 1551-2916 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1998 VL 81 IS 9 BP 2381 EP 2393 PG 13 WC Materials Science, Ceramics SC Materials Science GA 121AB UT WOS:000075989000020 ER PT J AU Stephenson, JL McLuckey, SA AF Stephenson, JL McLuckey, SA TI Reactions of poly(ethylene glycol) cations with iodide and perfluorocarbon anions SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID PROTON-TRANSFER REACTIONS; IONIZATION MASS-SPECTROMETRY; SIZE-EXCLUSION CHROMATOGRAPHY; ION-MOLECULE REACTIONS; ELECTROSPRAY-IONIZATION; POLYMERS; TRAP; PRINCIPLES; PROTEINS AB Multiply charged poly(ethylene glycol) ions of the form (M+nNa)(n+) derived from electrospray ionization have been subjected to reactions with negative ions in the quadrupole ion trap. Mixtures of multiply charged positive ions ranging in average mass from about 2000 to about 14,000 Da were observed to react with perfluorocarbon anions by either proton transfer or fluoride transfer. Iodide anions reacted with the same positive ions by attachment. Ln no case was fragmentation of the polymer ion observed. In all cases, the multiply charged positive ion charge states could be readily reduced to +1, thereby eliminating the charge state overlap observed in the normal electrospray mass spectrum. With all three reaction mechanisms, however, the +1 product ions were comprised of mixtures of products with varying numbers of sodium ions, and in the case of iodide attachment and fluoride transfer, varying numbers of halogen anions. These reactions shift the mass distributions to higher masses and broaden the distributions. The extents to which these effects occur are functions of the magnitudes of the initial charges and the width of the initial charge state distributions. Care must be taken in deriving information about the polymer molecular weight distribution from the singly charged product ions arising from these ion/ion reactions. The cluster ions containing iodide were shown to be intermediates in sodium ion transfer. Dissociation of the adduct ions can therefore lead to a +1 product ion population that is comprised predominantly of M+Na+ ions. However, a strategy based on the dissociation of the iodide cluster ions is limited by difficulties in dissociating high mass-to-charge ions in the quadrupole ion trap. (C) 1998 American Society for Mass Spectrometry. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP McLuckey, SA (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Stephenson, James/A-9262-2009; McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 37 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD SEP PY 1998 VL 9 IS 9 BP 957 EP 965 DI 10.1016/S1044-0305(98)00066-X PG 9 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA 112MP UT WOS:000075498600011 ER PT J AU Lancaster, VA Keller-McNulty, S AF Lancaster, VA Keller-McNulty, S TI A review of composite sampling methods SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Review DE group screening; group testing; pooling; weighing designs ID RARE DISEASE; POOLED SERA; PREVALENCE; SEROPREVALENCE; POPULATION AB A composite is formed by collecting multiple sample units and combining them in their entirety or in part, to form a new sample. The sample units that make up the composite may retain their integrity or be homogenized through physical processes such as ball milling, sieving, shaking, or centrifuging. One or more subsequent measurements are taken on the composite and the information on the sample units is lost. This counterintuitive loss of information has fueled opposition to composite sampling, while the methodology's adherents find their motivation in its ability to reduce measurement costs for many classes of problems. This article reviews the scientific literature related to the development of composite sampling methods. The literature on compositing exists only as a compendium derived from disparate disciplines in which terms such as compositing, group screening, pooling, and weighing designs are used. The goal of this review is to synthesize this body of literature. The articles reviewed are Limited to those that offer original applications or methodologies. A novel application in numerical regularization, is illustrated using data from an environmental investigation into mercury contamination at a waste disposal site in New Mexico. What is unusual about these data is the existence of measurements at both the composite and sample unit levels, thus allowing an opportunity to evaluate estimates based on composite sampling methods. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Lancaster, VA (reprint author), 657 Magnolia Wood Ave, Baton Rouge, LA 70808 USA. NR 60 TC 20 Z9 20 U1 3 U2 11 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 USA SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD SEP PY 1998 VL 93 IS 443 BP 1216 EP 1230 DI 10.2307/2669863 PG 15 WC Statistics & Probability SC Mathematics GA 123BG UT WOS:000076105500045 ER PT J AU Rougier, A Striebel, KA Wen, SJ Cairns, EJ AF Rougier, A Striebel, KA Wen, SJ Cairns, EJ TI Cyclic voltammetry of pulsed laser deposited LixMn2O4 thin films SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SECONDARY LITHIUM BATTERIES; RECHARGEABLE MICROBATTERIES; LIMN2O4; SYSTEM; CELLS; INSERTION; CATHODES AB Electrochemical properties of thin films of LixMn2O4 spinel prepared by pulsed laser deposition were studied using constant current cycling and cyclic voltammetry. Films have been cycled more than 220 times with no significant capacity fading. The shape of the cyclic voltammogram is very sensitive to the composition and morphology of the film. The diffusion process for the LixMn2O4 thin films with an excess of lithium (x > 1) appears to be slower than for lithium-deficient films. Films were subjected to overcharge (5 V vs. Li/Li+) and overdischarge (2 V vs. Li/Li+). Overcharge does not significantly affect the structure of the film. Overdischarge leads to changes in the shape of the cyclic voltammogram: (i) loss of resolution of the two oxidation peaks at 4.1 and 4.2 V which are the signatures of the spinel structure, and (ii) loss of capacity. These changes in the electrochemical behavior may be correlated to the structural disorder associated with the phase transition when more than one lithium is intercalated in LiMn2O4. It is a reversible phenomenon. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RP Rougier, A (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 22 TC 84 Z9 87 U1 3 U2 25 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1998 VL 145 IS 9 BP 2975 EP 2980 DI 10.1149/1.1838750 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 112DR UT WOS:000075479300002 ER PT J AU Shea, LE McKittrick, J Phillips, MLF AF Shea, LE McKittrick, J Phillips, MLF TI Predicting and modeling the low-voltage cathodoluminescent efficiency of oxide phosphors SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID PARTICLE AB A novel ceramic synthesis technique, combustion synthesis, was used to produce submicron-sized Y2O3:Eu3+ phosphors. This technique exploits the exothermic redox reaction of yttrium and europium nitrates (oxidizers) with urea (CH4N2O) fuel (reducing agent). Resulting powders were luminescent in the as-synthesized state. However, their luminous intensity increased with increasing postreaction annealing treatments (1000-1600 degrees C for 2 h). The low-voltage (200-1000 V) cathodoluminescence efficiency of Y2O3:Eu3+ was found to increase with increasing crystallite size, independent of the particle size. A model of low-voltage cathodoluminescence that includes the effects of the crystallite size, the probability of radiative recombination, and the effect of surface-bound electrons was developed to predict phosphor efficiency at low voltages. The efficiencies predicted by the model are in very good agreement with experimental results. C1 Univ Calif San Diego, Dept Appl Mech & Engn Sci, La Jolla, CA 92093 USA. Univ Calif San Diego, Mat Sci Program, La Jolla, CA 92093 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Shea, LE (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 18 TC 19 Z9 21 U1 0 U2 5 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1998 VL 145 IS 9 BP 3165 EP 3170 DI 10.1149/1.1838781 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 112DR UT WOS:000075479300033 ER PT J AU Stein, DJ Hetherington, D Guilinger, T Cecchi, JL AF Stein, DJ Hetherington, D Guilinger, T Cecchi, JL TI In situ electrochemical investigation of tungsten electrochemical behavior during chemical mechanical polishing SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID FILMS AB The electrochemical behavior of tungsten during chemical mechanical polishing (CMP) was observed in order to investigate a proposed blanket passivation and abrasion mechanism for tungsten removal. The experiments were performed in a cell that allowed electrochemical measurements to be made during polish. Polish rates were determined from the same samples used in the cell. Alumina-based polish slurries containing potassium iodate, ferric nitrate, or ammonium persulfate were used. DC polarization experiments show no evidence of passive film formation on the tungsten during polish. Tungsten oxidation rates measured during polish account for removal rates that are 1 to 2 orders of magnitude below the measured polish rate. Values of the charge-transfer resistance (measured bg ac impedance spectroscopy) during polish are I to 2 orders of magnitude higher than expected from the polish rate. thus corroborating the de-based data. Polish rates under potentiostatic conditions were also measured. The current required to maintain the metal anodic of the open-circuit potential is well below the current expected from measured polish rates. assuming complete oxidation of the tungsten. The polish rate during cathodic potentiostatic conditions (-0.5 V with regard to the open-circuit potential) was similar to the polish rate at open circuit. We conclude that the formation of a blanket passive layer does not significantly contribute to tungsten removal during CMP. C1 Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Stein, DJ (reprint author), Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA. NR 15 TC 51 Z9 52 U1 1 U2 7 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1998 VL 145 IS 9 BP 3190 EP 3196 DI 10.1149/1.1838785 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA 112DR UT WOS:000075479300037 ER PT J AU Lopez, AR Hassan, B Oberkampf, WL Neiser, RA Roemer, TJ AF Lopez, AR Hassan, B Oberkampf, WL Neiser, RA Roemer, TJ TI Computational fluid dynamics analysis of a wire-feed, high-velocity oxygen fuel (HVOF) thermal spray porch SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE CFD; experimental data; HVOF; thermal spray; two-phase flow ID TORCH AB The fluid and particle dynamics of a high-velocity oxygen fuel (HVOF) thermal spray torch are analyzed using computational and experimental techniques. Three-dimensional computational fluid dynamics (CFD) results are presented for a curved aircap used for coating interior surfaces such as engine cylinder bores. The device analyzed is similar to the Metco diamond jet rotating wire (DJRW) torch. The feed gases are injected through an axisymmetric nozzle into the curved aircap. Premixed propylene and oxygen are introduced from an annulus in the nozzle, while cooling air is injected between the nozzle and the interior wall of the aircap. The combustion process is modeled using a single-step, finite-rate chemistry model with a total of nine gas species which includes dissociation of combustion products. A continually fed steel wire passes through the center of the nozzle, and melting occurs at a conical tip near the exit of the aircap. Wire melting is simulated computationally by injecting liquid steel particles into the flow field near the tip of the wire. Experimental particle velocity measurements during wire feed were also taken using a laser two-focus (L2F) velocimeter system. Flow fields inside and outside the aircap are presented, and particle velocity predictions are compared with experimental measurements outside of the aircap. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Ktech Corp, Albuquerque, NM USA. RP Lopez, AR (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM arlopez@sandia.gov NR 18 TC 17 Z9 17 U1 1 U2 8 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 USA SN 1059-9630 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD SEP PY 1998 VL 7 IS 3 BP 374 EP 382 DI 10.1361/105996398770350855 PG 9 WC Materials Science, Coatings & Films SC Materials Science GA 119WF UT WOS:000075920600020 ER PT J AU Hollis, K Neiser, R AF Hollis, K Neiser, R TI Analysis of the nonthermal emission signal present in a molybdenum particle-laden plasma-spray plume SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE diagnostic; line emission; nonthermal correction; particle pyrometry ID TEMPERATURE AB In-flight measurement of the surface temperature of plasma-sprayed particles is important for the correlation of particle characteristics to coating structure and properties. However, the use of optical pyrometry for particle surface temperature measurement has inherent uncertainties due to nonthermal emission signals in the plasma/particle plume. This nonthermal signal is especially bothersome near the torch exit and in regions of the plume where there are few particles. This work presents measurements of the nonthermal signals present when making temperature measurements of plasma-sprayed molybdenum particles. Changes in the nonthermal emission signals were found to be caused by particle vapor, the spectral plasma loading effect, and particle reflection of plasma light, Care must be taken to avoid particle temperature errors due to these effects. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Hollis, K (reprint author), Univ Calif Los Alamos Natl Lab, MST-6 Met,MS G-770,POB 1663, Los Alamos, NM 87545 USA. NR 16 TC 9 Z9 9 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 USA SN 1059-9630 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD SEP PY 1998 VL 7 IS 3 BP 383 EP 391 DI 10.1361/105996398770350864 PG 9 WC Materials Science, Coatings & Films SC Materials Science GA 119WF UT WOS:000075920600021 ER PT J AU Hollis, K Neiser, R AF Hollis, K Neiser, R TI Particle temperature and flux measurement utilizing a nonthermal signal correction process SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE diagnostic, flux; multi-color pyrometry; nonthermal correction; particle AB In-flight measurement of the surface temperature of plasma-sprayed particles is important for the correlation of particle characteristics to coating structure and properties. However, the use of optical pyrometry for particle surface temperature measurement has inherent uncertainties due to nonthermal emission signals in the plasma/particle plume, This nonthermal signal is especially pronounced near the torch exit and in regions of the plume where there are few particles. This work shows that both plasma and particle vapor signals in the form of line emission and continuum emission can be compensated for when calculating particle temperatures from the emission of the plasma/particle plume. The nonthermal signals have been estimated and removed from the ram spectral data, producing a more accurate calculated particle temperature. Using spectral shape fitting to determine the particle temperatures allows the radiant intensity to be used for particle flux estimation, thus providing more information on the state of the particle plume. Additionally, the spectral emittance of molybdenum particles sprayed in air was found to more closely resemble the emittance of pure molybdenum than the emittance of MoO3. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Hollis, K (reprint author), Univ Calif Los Alamos Natl Lab, MST-6 Met,MS G-770,POB 1663, Los Alamos, NM 87545 USA. NR 13 TC 13 Z9 13 U1 0 U2 3 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 USA SN 1059-9630 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD SEP PY 1998 VL 7 IS 3 BP 392 EP 402 DI 10.1361/105996398770350873 PG 11 WC Materials Science, Coatings & Films SC Materials Science GA 119WF UT WOS:000075920600022 ER PT J AU Wang, LQ Ferris, KF Winokur, JP Shultz, AN Baer, DR Engelhard, MH AF Wang, LQ Ferris, KF Winokur, JP Shultz, AN Baer, DR Engelhard, MH TI Interactions of methanol with stoichiometric and defective TiO2(110) and (100) surfaces SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 44th National Symposium of the American-Vacuum-Society CY OCT 20-24, 1997 CL SAN JOSE, CALIFORNIA SP Amer Vacuum Soc ID FORMIC-ACID; ADSORPTION; HCOOH AB Interactions of CH3OH with stoichiometric (nearly defect-free) and defective TiO2(110) and (100) surfaces have been studied using x-ray photoelectron spectroscopy and ultraviolet photoemission spectroscopy. The CH3OH saturation coverage was increased by increasing the number of defects created by electron-beam exposure or Ar+ ion bombardment. A small percentage of any defects produced were healed upon the saturation exposure (defect healing means a reduction in defect signal observed by the photoemission measurements). The structural influence on the adsorption and surface defect reactivity was found to be less significant for CH3OH than for H2O. The CH3OH coverages at a given exposure and defect reactivity were comparable for both the (100) and (110) surfaces. (C) 1998 American Vacuum Society. [S0734-2101(98)02005-3]. C1 Pacific NW Natl Lab, Mat & Chem Sci Ctr, Richland, WA 99352 USA. Ft Lewis Coll, Dept Phys, Durango, CO 81301 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99452 USA. RP Wang, LQ (reprint author), Pacific NW Natl Lab, Mat & Chem Sci Ctr, POB 999, Richland, WA 99352 USA. RI Engelhard, Mark/F-1317-2010; Baer, Donald/J-6191-2013; OI Baer, Donald/0000-0003-0875-5961; Engelhard, Mark/0000-0002-5543-0812 NR 16 TC 28 Z9 28 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1998 VL 16 IS 5 BP 3034 EP 3040 DI 10.1116/1.581456 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA 121MJ UT WOS:000076017300041 ER PT J AU Zhuang, GR Wang, K Chen, Y Ross, PN AF Zhuang, GR Wang, K Chen, Y Ross, PN TI Study of the reactions of Li with tetrahydrofuran and propylene carbonate by photoemission spectroscopy SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 44th National Symposium of the American-Vacuum-Society CY OCT 20-24, 1997 CL SAN JOSE, CALIFORNIA SP Amer Vacuum Soc ID LITHIUM; XPS AB The reaction of Li with two organic solvents of technical importance in Li batteries, tetrahydrofuran (THF) and propylene carbonate (PC), were studied in ultrahigh vacuum by photoemission spectroscopy. The organic condensate layers were formed by dosing thin (6-10 nm) films of Li at 120-135 K, with the reactions monitored by x-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy upon subsequent warming of the sample. Activation of the first layer of THF by Li starts at a temperature as low as 120 It. Polymerization of tetrahydrofuran (THF) (forming poly-THF) occurs upon melting near 180 K, but is accompanied by chain-terminating reactions that form lithium alkoxide(s) and hydrocarbon gas(es), such as ethylene and/or propylene. Between 180 and 320 K, there is progressively greater conversion of poly-THF to alkoxide such that at 320 K, the surface film is almost entirely composed of alkoxide. At or near its bulk melting temperature of 220 K, essentially all of the PC remaining on the surface has reacted with Li to form an alkyl carbonate. With increasing temperature, part (25%-33%) of the alkyl carbonate decomposes to form an alkoxide. The alkyl group in the organo-li compounds derived from PC are most probably propylene. There is no evidence of the formation of any gaseous products containing carbon or oxygen at temperatures below 320 K under the conditions of these experiments. Of particular relevance to battery technology, however, is that in both cases the organo-li layers that have formed at 270-320 K were formed in the presence of excess unreacted Li, which is the usual circumstance in a real battery, and that no evidence was found of inorganic Li carbonate as a product of the reaction with PC. (C) 1998 American Vacuum Society. [S0734-2101 (98)00405-9]. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Ross, PN (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. NR 11 TC 17 Z9 17 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1998 VL 16 IS 5 BP 3041 EP 3045 DI 10.1116/1.581475 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA 121MJ UT WOS:000076017300042 ER PT J AU Hong, J Cho, H Maeda, T Abernathy, CR Pearton, SJ Shul, RJ Hobson, WS AF Hong, J Cho, H Maeda, T Abernathy, CR Pearton, SJ Shul, RJ Hobson, WS TI New plasma chemistries for dry etching of InGaAIP alloys: Bl(3) and BBr3 SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID MOLECULAR-BEAM EPITAXY; HETEROJUNCTION BIPOLAR-TRANSISTORS; FIELD-EFFECT TRANSISTORS; SINGLE-HETEROJUNCTION; LAYER; INP; PERFORMANCE; FABRICATION; HEMTS; GAAS AB Inductively coupled plasma etching of InCaP, AlInP and AlGaP in BI3 or BBr3 discharges was investigated as a function of source power, de chuck bias and plasma composition. InGaP etches at the fastest rates (>6000 Angstrom min(-1)) in both chemistries, followed by AlGaP. It is found that AlInP provides an excellent etch stop for the other two materials in both mixtures. The InGaP surface morphology improves with increasing BI3 of BBr3 content, and with increasing de chuck bias. The etched features for this material are highly anisotropic. Etch selectivities for InGaP over SiO2 and SiNx of greater than or equal to 8 are obtained in both plasma chemistries, and there is no etch incubation time with either mixture, indicating that both can scavenge the native oxide on InGaP, AlGaP and AlInP. (C) 1998 American Vacuum Society. C1 Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. Fujitsu Labs Ltd, Kanagawa, Japan. RP Hong, J (reprint author), Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA. NR 30 TC 4 Z9 4 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1998 VL 16 IS 5 BP 2690 EP 2694 DI 10.1116/1.590258 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA 129WW UT WOS:000076487900018 ER PT J AU Higgins, SR Jordan, G Eggleston, CM Knauss, KG AF Higgins, SR Jordan, G Eggleston, CM Knauss, KG TI Dissolution kinetics of the barium sulfate (001) surface by hydrothermal atomic force microscopy SO LANGMUIR LA English DT Letter ID DISLOCATION DENSITY; GROWTH AB Dissolution of the BaSO4(001) surface was studied for the first time by hydrothermal atomic force microscopy. Step velocities and pit nucleation rates as a function of temperature along with observations of surface morphology led to the conclusion that the dissolution process is most accurately described by a two-dimensional birth-and-spread model. C1 Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA. Univ Calif Lawrence Livermore Natl Lab, Div Earth Sci, Livermore, CA 94550 USA. RP Higgins, SR (reprint author), Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA. RI knauss, kevin/K-2827-2012 NR 15 TC 40 Z9 40 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD SEP 1 PY 1998 VL 14 IS 18 BP 4967 EP 4971 DI 10.1021/la9806606 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 116YX UT WOS:000075753800005 ER PT J AU Marion, J Kim, BM AF Marion, J Kim, BM TI Ultrafast lasers pin down tissue types SO LASER FOCUS WORLD LA English DT Article C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Marion, J (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 USA SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD SEP PY 1998 VL 34 IS 9 BP 86 EP 86 PG 1 WC Optics SC Optics GA 117NQ UT WOS:000075788700024 ER PT J AU Dearborn, DSP Seddon, MT Bauer, BS AF Dearborn, DSP Seddon, MT Bauer, BS TI The sanctuary of Titicaca: Where the sun returns to earth (Historical and archaeological evidence for Inka solar cult) SO LATIN AMERICAN ANTIQUITY LA English DT Article C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Chicago, Dept Anthropol, Chicago, IL 60637 USA. Univ Illinois Chicago, Dept Anthropol, Chicago, IL 60607 USA. RP Dearborn, DSP (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 28 TC 5 Z9 8 U1 0 U2 3 PU SOC AMER ARCHAEOLOGY PI WASHINGTON PA 900 SECOND ST., NE STE 12, WASHINGTON, DC 20002-3557 USA SN 1045-6635 J9 LAT AM ANTIQ JI Lat. Am. Antiq. PD SEP PY 1998 VL 9 IS 3 BP 240 EP 258 DI 10.2307/971730 PG 19 WC Archaeology SC Archaeology GA 124KM UT WOS:000076181500003 ER PT J AU Jones, JB Mulholland, PJ AF Jones, JB Mulholland, PJ TI Methane input and evasion in a hardwood forest stream: Effects of subsurface flow from shallow and deep pathways SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article ID INTRODUCED ORGANIC-COMPOUNDS; CARBON-DIOXIDE; CRYSTALLINE BEDROCK; SURFACE WATERS; GROUNDWATER; EXCHANGE; NUTRIENT; PATTERNS; RIVER; LAKES AB Streams are typically supersaturated and emit methane to the atmosphere. Much of this gas appears to be imported from groundwater and riparian zones, where anoxia and methane production are common. We investigated how methane evasion and the concentration in groundwater discharge varied between five stream sections with differing rates of groundwater discharge along the east fork of Walker Branch in eastern Tennessee. Evasion and groundwater concentration were determined from measurements of methane in surface water in conjunction with coinjection of conservative solute and volatile gas tracers. Methane in surface water was supersaturated, varying from 0.67 to 1.56 mu g CH4 liter(-1), which translates to concentrations 17.6-41.4 times greater than those at atmospheric equilibrium. Methane evasion rates ranged from 0.4 to 13.2 mg CH4 m(-2) d(-1). Differences in methane concentration and evasion were related to variation in subsurface discharge and concentration in groundwater. All study sections gained flow, although the rate of subsurface discharge into the second study section (section 2) was particularly low. Furthermore, the specific conductance of groundwater flowing into section 2 averaged only 82.3 mu S cm(-1), compared with 110-125 mu S cm(-1) in the other study sections, indicating that groundwater discharge was derived from riparian soils as opposed to deeper flow from fractured bedrock. The mean concentration of 549.2 mu g CH4 liter(-1) in subsurface water flowing into section 2 was notably greater than in the other sections, where average groundwater concentration ranged from 158.9 to 376.2 mu g CH4 liter(-1). Our results suggest that subsurface flow from riparian soils appears to be the major source of methane to streams, although deeper bedrock Bow also supplies methane at a lower concentration to surface waters. C1 Univ Nevada, Dept Biol Sci, Las Vegas, NV 89154 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Jones, JB (reprint author), Univ Nevada, Dept Biol Sci, 4505 Maryland Pkwy, Las Vegas, NV 89154 USA. RI Mulholland, Patrick/C-3142-2012 NR 40 TC 45 Z9 45 U1 1 U2 19 PU AMER SOC LIMNOLOGY OCEANOGRAPHY PI WACO PA 5400 BOSQUE BLVD, STE 680, WACO, TX 76710-4446 USA SN 0024-3590 J9 LIMNOL OCEANOGR JI Limnol. Oceanogr. PD SEP PY 1998 VL 43 IS 6 BP 1243 EP 1250 PG 8 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA 135GC UT WOS:000076791700018 ER PT J AU Pan, JW Twieg, DB Hetherington, HP AF Pan, JW Twieg, DB Hetherington, HP TI Quantitative spectroscopic imaging of the human brain SO MAGNETIC RESONANCE IN MEDICINE LA English DT Article DE magnetic resonance spectroscopy; quantification; B-1 mapping; N-acetylaspartate; creatine ID ABSOLUTE QUANTITATION; WHITE-MATTER; IN-VIVO; 4.1 T; METABOLITES; QUANTIFICATION; SPECTRA; INVIVO; GRAY AB A method to provide B-1 correction and cerebrospinal fluid (CSF) referencing is developed and applied to spectroscopic imaging of the human brain at 4.1 T using a volume head coil. The B-1 image allows rapid determination of the spatially dependent B-1 that is then used to compensate for the B-1 sensitivity of the spectroscopic sequence. The reference signal is acquired from CSF located in a lateral ventricular position using a point-resolved echo spectroscopy (PRESS) acquisition. The CSF spectrum is also corrected for B-1 dependence, Together with T-2 and T-1 corrections, this method is used to provide quantitative values of N-acetylaspartate (NAA), creatine (Cr), and choline (Ch). The metabolite concentrations obtained from a spectroscopic imaging slice through the ventricles in seven normal controls are in good agreement with previously published literature values. This method is applied in a patient with secondary progressive multiple sclerosis, showing separate areas of abnormalities in both NAA and Cr. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Alabama, Ctr Nucl Imaging Res, Dept Neurol, Birmingham, AL USA. Univ Alabama, Ctr Nucl Imaging Res, Dept Biomed Engn, Birmingham, AL USA. RP Pan, JW (reprint author), Brookhaven Natl Lab, Dept Med, POB 5000, Upton, NY 11973 USA. FU NCRR NIH HHS [P41-RR-118811]; NINDS NIH HHS [R01-NS-33991] NR 21 TC 72 Z9 73 U1 1 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 USA SN 0740-3194 J9 MAGNET RESON MED JI Magn.Reson.Med. PD SEP PY 1998 VL 40 IS 3 BP 363 EP 369 DI 10.1002/mrm.1910400305 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 113UE UT WOS:000075570500004 PM 9727938 ER PT J AU Natesan, K AF Natesan, K TI Corrosion performance of ceramic materials in slagging environments SO MATERIALS PERFORMANCE LA English DT Article AB Conceptual designs of advanced combustion systems that use coal as a feedstock require high-temperature furnaces and heat-transfer surfaces that can operate at temperatures much higher than those prevalent in current coal-fired power plants. The combination of elevated temperatures and hostile combustion environments requires the development and application of advanced ceramic materials in these designs. The objectives of the present program are to evaluate the chemistry of gaseous and condensed products that arise during combustion of coal; corrosion behavior of candidate materials in air, sing, and salt environments for application in the combustion environments; and residual mechanical properties of the materials after corrosion. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Natesan, K (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 USA SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD SEP PY 1998 VL 37 IS 9 BP 28 EP 33 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA 115UU UT WOS:000075684700007 ER PT J AU Gilmore, DL Han, HN Derby, B AF Gilmore, DL Han, HN Derby, B TI Model for consolidation of Ti-6Al-4V/SiC fibre composite from plasma sprayed monotape SO MATERIALS SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT Conference on Metal Matrix Composites VI (MMCVI) CY NOV 26-27, 1997 CL ROYAL SOC LONDON, LONDON, ENGLAND HO ROYAL SOC LONDON ID BEHAVIOR; ALLOY AB A model has been developed for the consolidation of low pressure plasma sprayed (LPPS) titanium alloy matrix/silicon carbide fibre composites. Empirical constitutive equations were combined with an analytical model to describe the deformation of the rough surface region. The same constitutive equations were combined with alternatively analytical and empirical yield criteria to describe the deformation of the regions of closed porosity surrounding the fibres. The two submodels were then combined with finite element analysis to make predictions of relative density and gl ain size as functions of pressure, temperature , and time, as well as predictions of the variations in porosity with position and fibre spacing. Experiments to validate the model were carried out using Archimedes' pl principle and both optical and scanning electron metallography. Data were found to agree reasonably well with predicted values. MST/4027. C1 Univ Oxford, Dept Mat, Oxford Ctr Adv Mat & Composite, Oxford OX1 3PH, England. RP Gilmore, DL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RI Derby, Brian/E-3529-2010; Han, Heung Nam/D-6461-2013; Han, Heung Nam/I-7675-2016 OI Derby, Brian/0000-0001-5753-0166; Han, Heung Nam/0000-0001-5271-9023; NR 13 TC 2 Z9 2 U1 0 U2 1 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON SW1Y 5DB, ENGLAND SN 0267-0836 J9 MATER SCI TECH SER JI Mater. Sci. Technol. PD SEP-OCT PY 1998 VL 14 IS 9-10 BP 933 EP 938 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 127DE UT WOS:000076334600016 ER PT J AU Martin, MHE Cesarano, J Xu, X Stiopina, N Yanusova, L AF Martin, MHE Cesarano, J Xu, X Stiopina, N Yanusova, L TI Oligopeptide amphiphiles for Langmuir-Blodgett films SO MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC MATERIALS SENSORS AND SYSTEMS LA English DT Article DE oligopeptide amphiphiles; Langmuir-Blodgett films; Merrifield solid phase synthesis; stearic acid ID INORGANIC-ORGANIC INTERFACES; ACID MONOLAYERS; CRYSTALLIZATION; CRYSTALS; GROWTH; NUCLEATION AB A series of oligopeptide amphiphiles for use in a biomineralization model system were designed and fabricated using an automated Merrifield peptide synthesis. The isothermic compression behavior of these molecules in an aqueous Langmuir-Blodgett trough was investigated and compared with the behavior of a well-understood fatty acid molecule (stearic acid). Films of an oligopeptide were deposited on a hydrophobic silicon wafer and preliminary structural measurements were made using ellipsometry and small angle X-ray scattering. (C) 1998 Elsevier Science S.A. All rights reserved. C1 Sandia Natl Labs, AML, Albuquerque, NM 87106 USA. Univ New Mexico, AML, Albuquerque, NM 87106 USA. Russian Acad Sci, Inst Crystallog, Moscow 117333, Russia. NR 32 TC 0 Z9 0 U1 2 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0928-4931 J9 MAT SCI ENG C-BIOMIM JI Mater. Sci. Eng. C-Biomimetic Mater. Sens. Syst. PD SEP PY 1998 VL 6 IS 1 BP 1 EP 5 DI 10.1016/S0928-4931(97)00068-4 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA 133GL UT WOS:000076678700001 ER PT J AU Mittler, JE Sulzer, B Neumann, AU Perelson, AS AF Mittler, JE Sulzer, B Neumann, AU Perelson, AS TI Influence of delayed viral production on viral dynamics in HIV-1 infected patients SO MATHEMATICAL BIOSCIENCES LA English DT Article DE HIV-1; AIDS; mathematical models; viral load; antiretroviral therapy; protease inhibitors ID IMMUNODEFICIENCY-VIRUS TYPE-1; IN-VIVO; LIFE-SPAN; THERAPY; PLASMA; DECAY AB We present and analyze a model for the interaction of human immunodeficiency virus type 1 (HIV-1) with target cells that includes a time delay between initial infection and the formation of productively infected cells. Assuming that the variation among cells with respect to this 'intracellular' delay can be approximated by a gamma distribution, a high flexible distribution that can mimic a variety of biologically plausible delays, we provide analytical solutions for the expected decline in plasma virus concentration after the initiation of antiretroviral therapy with one or more protease inhibitors. We then use the model to investigate whether the parameters that characterize viral dynamics can be identified from biological data. Using non-linear least-squares regression to fit the model to simulated data in which the delays conform to a gamma distribution, we show that good estimates for free viral clearance rates, infected cell death rates, and parameters characterizing the gamma distribution can be obtained. For simulated data sets in which the delays were generated using other biologically plausible distributions, reasonably good estimates for viral clearance rates, infected cell death rates, and mean delay times can be obtained using the gamma-delay model. For simulated data sets that include added simulated noise, viral clearance rate estimates are not as reliable. If the mean intracellular delay is known, however, we show that reasonable estimates for the viral clearance rate can be obtained by taking the harmonic mean of viral clearance rate estimates from a group of patients. These results demonstrate that it is possible to incorporate distributed intracellular delays into existing models for HIV dynamics and to use these refined models to estimate the half-life of free virus from data on the decline in HIV-1 RNA following treatment. (C) 1998 Elsevier Science Inc. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Theoret Biol & Biophys Grp, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Lion BioSci AG, D-69120 Heidelberg, Germany. Bar Ilan Univ, Dept Biol, Tel Aviv, Israel. Santa Fe Inst, Santa Fe, NM 87501 USA. RP Mittler, JE (reprint author), Univ Calif Los Alamos Natl Lab, Theoret Biol & Biophys Grp, MS-K710, Los Alamos, NM 87545 USA. FU NCRR NIH HHS [RR06555]; NIAID NIH HHS [AI40387] NR 18 TC 154 Z9 161 U1 1 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0025-5564 J9 MATH BIOSCI JI Math. Biosci. PD SEP PY 1998 VL 152 IS 2 BP 143 EP 163 DI 10.1016/S0025-5564(98)10027-5 PG 21 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA 120ZD UT WOS:000075987000003 PM 9780612 ER PT J AU Difilippo, FC AF Difilippo, FC TI Forward and adjoint methods for radiotherapy planning SO MEDICAL PHYSICS LA English DT Article DE dose optimization; sensitivity theory; Monte Carlo; and discrete ordinates methods; adjoint and forward techniques; tagging of functionals AB The sensitivity theory developed for nuclear engineering applications is applied to radiotherapy planning. After emphasizing the mathematical equivalence of solving the Boltzmann equation in forward and adjoint spaces both mathematical approaches are implemented to calculate the sensitivities of the dose distributions in a mathematical phantom to changes in the source of radiation. The tagging of the functionals of the radiation field with the origin of the source (forward or adjoint) makes possible the calculation of the sensitivity of the dose to the position, angular distribution, intensity, and spectra of the source, in a very efficient way by using present day available codes and hardware. There is then a potential for a new, accurate and potentially faster method that does not rely on a trial and error methodology. (C) 1998 American Association of Physicists in Medicine. C1 Oak Ridge Natl Lab, Computat Phys & Engn Div, Oak Ridge, TN 37831 USA. RP Difilippo, FC (reprint author), Oak Ridge Natl Lab, Computat Phys & Engn Div, POB 2008,Bldg 6025, Oak Ridge, TN 37831 USA. EM fcd@ornl.gov NR 17 TC 11 Z9 11 U1 0 U2 2 PU AMER ASSOC PHYSICISTS MEDICINE AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0094-2405 J9 MED PHYS JI Med. Phys. PD SEP PY 1998 VL 25 IS 9 BP 1702 EP 1710 DI 10.1118/1.598358 PG 9 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 121BL UT WOS:000075992200014 PM 9775376 ER PT J AU Bleuel, DL Donahue, RJ Ludewigt, BA Vujic, J AF Bleuel, DL Donahue, RJ Ludewigt, BA Vujic, J TI Designing accelerator-based epithermal neutron beams for boron neutron capture therapy SO MEDICAL PHYSICS LA English DT Article DE BNCT; accelerator; epithermal neutron beam; moderator design ID BNCT AB The Li-7(p,n)Be-7 reaction has been investigated as an accelerator-driven neutron source for proton energies between 2.1 and 2.6 MeV. Epithermal neutron beams shaped by three moderator materials, Al/AlF3, (LiF)-Li-7, and D2O, have been analyzed and their usefulness for boron neutron capture therapy (BNCT) treatments evaluated. Radiation transport through the moderator assembly has been simulated with the Monte Carlo N-particle code (MCNP). Fluence and dose distributions in a head phantom were calculated using BNCT treatment planning software. Depth-dose distributions and treatment times were studied as a function of proton beam energy and moderator thickness. It was found that an accelerator-based neutron source with Al/AlF3 or( 7)LiF as moderator material can produce depth-dose distributions superior to those calculated for a previously published neutron beam design for the Brookhaven Medical Research Reactor, achieving up to similar to 50% higher doses near the midline of the brain. For a single beam treatment, a proton beam current of 20 mA, and a 7LiF moderator, the treatment time was estimated to be about 40 min. The tumor dose deposited at a depth of 8 cm was calculated to be about 21 Gy-Eq. (C) 1998 American Association of Physicists in Medicine. C1 EO Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Bleuel, DL (reprint author), EO Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 31 TC 51 Z9 54 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0094-2405 J9 MED PHYS JI Med. Phys. PD SEP PY 1998 VL 25 IS 9 BP 1725 EP 1734 DI 10.1118/1.598353 PG 10 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 121BL UT WOS:000075992200017 PM 9775379 ER PT J AU Alburger, DE Raparia, D Zucker, MS AF Alburger, DE Raparia, D Zucker, MS TI Phantoms with (10)BF(3) detectors for boron neutron capture therapy applications SO MEDICAL PHYSICS LA English DT Article DE BNCT; phantom; (10)BF(3) detector; depth-dose distributions AB Two acrylic cube phantoms have been constructed for BNCT applications that allow the depth distribution of neutrons to be measured with miniature (10)BF(3) detectors in 0.5-cm steps beginning at l-cm depth. Sizes and weights of the cubes are 14 cm, 3.230 kg, and 11 cm, 1.567 kg. Tests were made with the epithermal neutron beam from the patient treatment port of the Brookhaven Medical. Research Reactor. Thermal neutron depth profiles were measured with a bare (10)BF(3) detector at a reactor power of 50 W, and Cd-covered detector profiles were measured at a reactor power of 1 kW. The resulting plots of counting rate versus depth illustrate the dependence of neutron moderation on the size of the phantom. But more importantly the data can serve as benchmarks for testing the thermal and epithermal neutron profiles obtained with accelerator-based BNCT facilities. Such tests could be made with these phantoms at power levels about five orders of magnitude lower than that required for the treatment of patients with brain tumors. (C) 1998 American Association of Physicists in Medicine. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Alburger, DE (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU AMER ASSOC PHYSICISTS MEDICINE AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0094-2405 J9 MED PHYS JI Med. Phys. PD SEP PY 1998 VL 25 IS 9 BP 1735 EP 1738 DI 10.1118/1.598354 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 121BL UT WOS:000075992200018 PM 9775380 ER PT J AU Alexandrov, IV Zhu, YT Lowe, TC Islamgaliev, RK Valiev, RZ AF Alexandrov, IV Zhu, YT Lowe, TC Islamgaliev, RK Valiev, RZ TI Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Mechanical Behavior of Bulk Nanocrystalline Solids at the Fall TMS/ASM Meeting and Materials Week CY SEP 14-18, 1997 CL INDIANAPOLIS, INDIANA SP Mech Met (SMD), Powder Mat (MDMD), Chem & Physics Mat (EMPMD/SMD) Comm of TMS ID SEVERE PLASTIC-DEFORMATION; NANOCRYSTALLINE MATERIALS; GRAINED MATERIALS; MECHANICAL-PROPERTIES; ZR ALLOY; COPPER; METALS; CU; TEMPERATURE; BEHAVIOR AB The microstructures and properties of copper- and aluminum-based nanocomposites processed through severe plastic torsional straining (SPTS) consolidation of metallic micrometer powders and ceramic nanopowders were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), microhardness and electrical resistivity measurements, and mechanical tests. It was shown that the SPTS consolidation of powders is an effective technique for fabricating metal-ceramic nanocomposites with a high density, ultrafine grain size, and high strength. Copper samples processed under a high pressure of 6 GPa exhibited high failure strength and strain as well as unusual strain hardening. Superplastic-like behavior was found in Al-Al2O3 nanocomposite samples. C1 Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia. Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Alexandrov, IV (reprint author), Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia. RI Zhu, Yuntian/B-3021-2008 OI Zhu, Yuntian/0000-0002-5961-7422 NR 52 TC 95 Z9 106 U1 0 U2 14 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1998 VL 29 IS 9 BP 2253 EP 2260 DI 10.1007/s11661-998-0103-4 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 120WX UT WOS:000075981400004 ER PT J AU Beaudoin, AJ Bryant, JD Korzekwa, DA AF Beaudoin, AJ Bryant, JD Korzekwa, DA TI Analysis of ridging in aluminum auto body sheet metal SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID POLYCRYSTAL PLASTICITY; TEXTURE; DEFORMATION; EVOLUTION AB A finite-element model is presented for the analysis of surface roughening of aluminum sheet metal. A hybrid finite-element model is developed which accounts for the elasto-viscoplastic constitutive response of a single crystallographic orientation. Initialization bf a finite-element mesh representing several grains is performed using data gathered through automated collection of backscattered Kikuchi diffraction data. To handle a region that contains sufficient:variation (contains numerous distinct grains), the implementation is carried out using distributed computation strategies. Application is made to 6111-T4 sheet metal intended for auto body applications. The numerical simulations are complemented with mechanical testing in plane strain and biaxial stretch. Based on the simulation results, there are two conclusions that can be drawn concerning the action of surface grains deforming through crystallographic slip. One is that grains can act collectively to form localized regions of thinning. The other is that grain interactions can lead to behavior which is different from that expected if grains deform with the average (macroscale) strain. Neighbor interactions can alter the deformation from that computed using the macroscale deformation rate. C1 Dept Mech & Ind Engn, Urbana, IL 61801 USA. Reynolds Met Co, Dept Corp Res & Dev, Chester, VA 23836 USA. Univ Calif Los Alamos Natl Lab, Dept Mat Sci, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Technol, Los Alamos, NM 87545 USA. RP Beaudoin, AJ (reprint author), Dept Mech & Ind Engn, Urbana, IL 61801 USA. NR 27 TC 54 Z9 55 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 USA SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1998 VL 29 IS 9 BP 2323 EP 2332 DI 10.1007/s11661-998-0109-y PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 120WX UT WOS:000075981400010 ER PT J AU Brockman, FJ Li, SW Fredrickson, JK Ringelberg, DB Kieft, TL Spadoni, CM White, DC McKinley, JP AF Brockman, FJ Li, SW Fredrickson, JK Ringelberg, DB Kieft, TL Spadoni, CM White, DC McKinley, JP TI Post-sampling changes in microbial community composition and activity in a subsurface paleosol SO MICROBIAL ECOLOGY LA English DT Article ID SOIL; BACTERIA; BIOMASS; STORAGE; SEDIMENTS; NUMBERS AB Laboratory storage of deep vadose zone sediments has previously resulted in an increase in the abundance of cultured microorganisms by as much as 10,000-fold, without concomitant increases in total microscopic counts. In the present study, factors contributing to the time-dependent stimulation of various microbiological parameters were examined during a 224 d post-sampling period, using a factorial-design experiment that partitioned the effects of storage time, sediment condition (intact blocks or homogenized) during storage, and O-2 concentration (0.5, 4.5, and 21%) during storage at 15 degrees C. Stored samples were analyzed at selected intervals, to determine direct microscopic counts, viable biomass, lipid biomarker profiles, cultured aerobic heterotrophic microorganisms, and microbial activity. Time of storage prior to analysis of the samples was the most important factor affecting the microbiological response. Sediment condition influenced the stimulation response: microbial activity and the population of cultured microorganisms increased faster, and reached slightly higher values, in the homogenized samples, although maximum values were reached at similar times in the homogenized and intact samples. O-2 concentration also influenced the response, but was the least important of the factors evaluated. Total cells and viable biomass, measured as total phospholipid fatty acids, changed little during storage. Maximum cultured populations and activity were attained at 63 to 112 d, with culture counts approximating the total numbers of microscopically counted cells. At approximately the same time, unbalanced growth (evidenced by high ratios of polyhydroxybutyrate to phospholipid fatty acid) indicated that inorganic nutrients became limiting. Lipid biomarkers indicative of Gram-positive bacteria, including actinomycetes, became dominant components of the community profiles in samples maintained at 0.5% and 4.5% O-2. The shift in the microbial community from relatively inactive, predominantly uncultured microorganisms to metabolically active populations that were nearly all cultured highlights the need for rapid initiation of analyses after sample acquisition, ii measurement of in situ microbiological properties is desired. The fact that these processes also occur in intact sediment blocks suggests that minor perturbations in the chemical or physical properties of subsurface sediments can result in major changes in the activity and composition of the microbial community. C1 Pacific NW Lab, Biogeochem Dept, Richland, WA 99352 USA. Univ Tennessee, Ctr Environm Biotechnol, Knoxville, TN 37932 USA. New Mexico Inst Min & Technol, Dept Biol, Socorro, NM 87801 USA. RP Brockman, FJ (reprint author), Pacific NW Lab, Biogeochem Dept, POB 999, Richland, WA 99352 USA. EM fj_brockman@pnl.gov NR 40 TC 23 Z9 24 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0095-3628 J9 MICROBIAL ECOL JI Microb. Ecol. PD SEP-OCT PY 1998 VL 36 IS 2 BP 152 EP 164 DI 10.1007/s002489900102 PG 13 WC Ecology; Marine & Freshwater Biology; Microbiology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Microbiology GA 107XP UT WOS:000075236500005 ER PT J AU Leff, LG McArthur, JV Shimkets, LJ AF Leff, LG McArthur, JV Shimkets, LJ TI Persistence and dissemination of introduced bacteria in freshwater microcosms SO MICROBIAL ECOLOGY LA English DT Article ID GENETICALLY ENGINEERED MICROORGANISMS; ESCHERICHIA-COLI; LAKE WATER; PSEUDOMONAS-FLUORESCENS; ANTIBIOTIC-RESISTANCE; SUSPENDED BACTERIA; EPIPHYTIC BACTERIA; AQUATIC MICROCOSMS; MODEL-ECOSYSTEMS; SURVIVAL AB Genetically engineered microorganisms (GEMs) released into the environment may persist and spread, depending on their features and conditions encountered. In streams, the extent of dispersion depends largely on cycles of attachment to, and detachment from, biofilms, because distribution of microorganisms is limited only by stream flow and settling rates, and because biofilms are the primary generator of bacterial cells. To simulate dissemination of introduced bacteria, multiple antibiotic-resistant bacteria (Chryseobacterium (Flavobacterium) indologenes) were introduced into microcosms containing water, sediments, and leaves. Marked bacteria reached greatest abundances in sediments, and contributions of bacteria from sediments to other habitats was relatively low. Bacterial attachment and detachment occurred rapidly, but the ability of marked bacteria to successfully exploit receiving habitats was comparatively low. Current speed influenced bacterial dis semination. A mechanistic model, using mortality and attachment/detachment rates, determined experimentally, was developed to predict bacterial exchanges in nature. The model was predictive of experimental results when only 5% of bacteria in sediments were available for detachment. Based on model results, an introduced bacterial strain, with mortality rates comparable to those of the model strain, is predicted to maintain highest abundances in sediments. However, within a month, abundance was predicted to be reduced by 98%; long-term persistence is possible if these low population sizes can be sustained. C1 Savannah River Ecol Lab, Aiken, SC 29802 USA. Univ Georgia, Dept Microbiol, Athens, GA 30602 USA. RP Leff, LG (reprint author), Kent State Univ, Dept Biol Sci, Box 5190, Kent, OH 44242 USA. NR 42 TC 14 Z9 15 U1 0 U2 9 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0095-3628 J9 MICROBIAL ECOL JI Microb. Ecol. PD SEP-OCT PY 1998 VL 36 IS 2 BP 202 EP 211 DI 10.1007/s002489900107 PG 10 WC Ecology; Marine & Freshwater Biology; Microbiology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Microbiology GA 107XP UT WOS:000075236500010 ER PT J AU Joy, DC Joy, CS AF Joy, DC Joy, CS TI Study of the dependence of E2 energies on sample chemistry SO MICROSCOPY AND MICROANALYSIS LA English DT Article DE SEM; polymers; charging; secondary electrons; backscattered electrons; charge balance ID ELECTRON AB Specimens that charge under electron beam irradiation in the scanning electron microscope (SEM) can be stabilized by choosing the beam energy to be such a value that the sum of the secondary and backscatter electron yields is unity, as this establishes a dynamic charge balance. We show here that for pure elements, the energies El and E2, for which charge balance occurs, are related directly to the atomic number of the material. Although generally there is no comparable relation for compounds, we also show that for polymers, the E2 energy is related both to the ratio of the number of valence electrons to molecular weight and to the electronegativity of the monomer units that form the polymer. C1 Univ Tennessee, Dept Biochem Cellular & Mol Biol, EM Facil, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Joy, DC (reprint author), Univ Tennessee, Dept Biochem Cellular & Mol Biol, EM Facil, Knoxville, TN 37996 USA. NR 8 TC 11 Z9 11 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1431-9276 J9 MICROSC MICROANAL JI Microsc. microanal. PD SEP-OCT PY 1998 VL 4 IS 5 BP 475 EP 480 DI 10.1017/S1431927698980448 PG 6 WC Materials Science, Multidisciplinary; Microscopy SC Materials Science; Microscopy GA 166XZ UT WOS:000078604400002 ER PT J AU Vasiliskov, VA Timofeev, EN Surzhikov, SA Drobyshev, AL Shik, VV Mirzabekov, AD AF Vasiliskov, VA Timofeev, EN Surzhikov, SA Drobyshev, AL Shik, VV Mirzabekov, AD TI A method for making microchips by copolymerization with acrylamide SO MOLECULAR BIOLOGY LA English DT Article ID DNA; HYBRIDIZATION; OLIGONUCLEOTIDE; PHOTOPOLYMERIZATION; MUTATIONS; SEQUENCES; ARRAYS C1 Moscow Phys Tech Inst, Dolgoprudnyi 141700, Russia. Russian Acad Sci, Engelhardt Inst Mol Biol, Moscow 117984, Russia. Argonne Natl Lab, Argonne, IL 60439 USA. RP Vasiliskov, VA (reprint author), Moscow Phys Tech Inst, Dolgoprudnyi 141700, Russia. NR 11 TC 1 Z9 1 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA CONSULTANTS BUREAU, 233 SPRING ST, NEW YORK, NY 10013 USA SN 0026-8933 J9 MOL BIOL+ JI Mol. Biol. PD SEP-OCT PY 1998 VL 32 IS 5 BP 780 EP 782 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 133HA UT WOS:000076680100023 ER PT J AU Kozik, A Bradbury, EM Zalensky, A AF Kozik, A Bradbury, EM Zalensky, A TI Increased telomere size in sperm cells of mammals with long terminal (TTAGGG)(n) arrays SO MOLECULAR REPRODUCTION AND DEVELOPMENT LA English DT Article DE bovine; porcine; human; telomere length; spermatogenesis ID ARCHITECTURE; VARIABILITY; NUCLEUS; LENGTH; DNA AB An increase in the length of telomeres in human sperm compared to somatic cells has long been noted and considered within a popular hypothesis involving telomere shortening and cell aging. In the present study we determined telomere length in two species with long terminal TTAGGG arrays-bovine and porcine. Using several independent methods we demonstrate that the telomeres in the sperm of human, porcine and bovine are elongated by 69%, 24%, and 14%, respectively, in comparison with somatic tissues. Therefore, increased sperm telomere length is a feature preserved throughout mammalian evolution. The biological role of this phenomenon is discussed in the context of telomere functions in meiosis and fertilization. Mel. Reprod. Dev. 51:98-104, 1998. (C) 1998 Wiley-Liss, Inc. C1 Univ Calif Davis, Sch Med, Dept Biol Chem, Davis, CA 95616 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. RP Zalensky, A (reprint author), Univ Calif Davis, Sch Med, Dept Biol Chem, Davis, CA 95616 USA. EM aozalensky@ucdavis.edu NR 34 TC 48 Z9 50 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 1040-452X J9 MOL REPROD DEV JI Mol. Reprod. Dev. PD SEP PY 1998 VL 51 IS 1 BP 98 EP 104 PG 7 WC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology SC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology GA 106WP UT WOS:000075174300012 PM 9712323 ER PT J AU Gruen, DM Buckley-Golder, I AF Gruen, DM Buckley-Golder, I TI Diamond films: Recent developments SO MRS BULLETIN LA English DT Article C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. AEA Technol, Harwell Lab, Didcot 11 ORA, Oxon, England. RP Gruen, DM (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave,Bldg 200, Argonne, IL 60439 USA. NR 0 TC 22 Z9 22 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD SEP PY 1998 VL 23 IS 9 BP 16 EP 17 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 121BU UT WOS:000075992900016 ER PT J AU Gruen, DM AF Gruen, DM TI Nucleation, growth, and microstructure of nanocrystalline diamond films SO MRS BULLETIN LA English DT Article ID VAPOR-DEPOSITION; SURFACE; ACETYLENE; PRECURSORS; ENERGETICS; MECHANISM; HYDROGEN; KINETICS; PLASMAS; C-60 C1 Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Gruen, DM (reprint author), Argonne Natl Lab, Div Sci Mat, 9700 S Cass Ave,Bldg 200, Argonne, IL 60439 USA. NR 40 TC 60 Z9 61 U1 1 U2 8 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD SEP PY 1998 VL 23 IS 9 BP 32 EP 35 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 121BU UT WOS:000075992900019 ER PT J AU Keblinski, P Wolf, D Cleri, F Phillpot, SR Gleiter, H AF Keblinski, P Wolf, D Cleri, F Phillpot, SR Gleiter, H TI On the nature of grain boundaries in nanocrystalline diamond SO MRS BULLETIN LA English DT Article ID AMORPHOUS INTERGRANULAR FILMS; ELECTRONIC-STRUCTURE; COMPUTER-SIMULATION; COVALENT MATERIALS; SILICON; STABILITY; CARBON; PLASMAS; TILT C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany. Ctr Ric Casaccia, ENEA, I-00100 Rome, Italy. RP Keblinski, P (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Phillpot, Simon/J-9117-2012; OI Phillpot, Simon/0000-0002-7774-6535 NR 30 TC 43 Z9 43 U1 0 U2 7 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA SN 0883-7694 J9 MRS BULL JI MRS Bull. PD SEP PY 1998 VL 23 IS 9 BP 36 EP 41 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 121BU UT WOS:000075992900020 ER PT J AU Collins, PG Bando, H Zettl, A AF Collins, PG Bando, H Zettl, A TI Nanoscale electronic devices on carbon nanotubes SO NANOTECHNOLOGY LA English DT Article; Proceedings Paper CT 5th Foresight Conference on Molecular Nanotechnology CY NOV 05-08, 1997 CL PALO ALTO, CALIFORNIA SP Foresight Inst ID MICROTUBULES; CONDUCTANCE; TRANSPORT; DEFECTS; ROPES AB Conductivity measurements were performed on bundles of single-walled carbon nanotubes with the aid of a scanning tunneling microscope (STM). Semimetallic current-voltage (I-V) characteristics generally indicated the bundles to be electronically similar to graphite. However, by moving the STM tip along the length of the nanotubes, sharp deviations in the I-V characteristics could also be observed. Well-defined positions were found at which the nanotube transport current changed abruptly from a graphitic response to one that is highly nonlinear and asymmetric, including near-perfect rectification. This abrupt change in the nanotube transport suggests that the STM tip had passed a region of the nanotube which acts less like a wire than it does a Schottky barrier or other heterojunction. Similar on-tube nanodevices have been theoretically predicted for point defects in individual carbon nanotubes and are consistent with our observations. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Electrotech Lab, Div Phys Sci, Tsukuba, Ibaraki 305, Japan. RP Collins, PG (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 19 TC 41 Z9 44 U1 0 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD SEP PY 1998 VL 9 IS 3 BP 153 EP 157 DI 10.1088/0957-4484/9/3/003 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA 126JH UT WOS:000076289800003 ER PT J AU Ruehlicke, C Schneider, D Schneicler, M DuBois, RD Balhorn, R AF Ruehlicke, C Schneider, D Schneicler, M DuBois, RD Balhorn, R TI Protein fragmentation due to slow highly charged ion impact SO NANOTECHNOLOGY LA English DT Article; Proceedings Paper CT 5th Foresight Conference on Molecular Nanotechnology CY NOV 05-08, 1997 CL PALO ALTO, CALIFORNIA SP Foresight Inst ID SURFACES; MICA AB We present first results of experiments on the fragmentation of biomolecules using highly charged heavy ions. Fragmentation and modification of oligopeptides, such as dimerization and attachment of ionic salt components, have been observed by means of mass spectrometry. Plasmid DNA molecules were imaged with an atomic force microscope after ion irradiation and profound molecular damage was found. C1 Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Technol, Livermore, CA 94550 USA. Univ Missouri, Dept Phys, Rolla, MO 65401 USA. Univ Calif Lawrence Livermore Natl Lab, Dept Biol & Biotechnol, Livermore, CA 94550 USA. RP Ruehlicke, C (reprint author), Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Technol, POB 808,Mail Stop L-421, Livermore, CA 94550 USA. EM ruehlicke1@llnl.gov; schneider2@llnl.gov; rdubois@physics.umr.edu; balhorn2@llnl.gov NR 8 TC 8 Z9 8 U1 0 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD SEP PY 1998 VL 9 IS 3 BP 251 EP 256 DI 10.1088/0957-4484/9/3/017 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA 126JH UT WOS:000076289800017 ER PT J AU Weis, AE Abrahamson, WG AF Weis, AE Abrahamson, WG TI Just lookin' for a home SO NATURAL HISTORY LA English DT Article C1 Univ Calif Irvine, Irvine, CA 92717 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Bucknell Univ, Lewisburg, PA 17837 USA. RP Weis, AE (reprint author), Univ Calif Irvine, Irvine, CA 92717 USA. NR 0 TC 1 Z9 1 U1 1 U2 13 PU AMER MUSEUM NAT HISTORY PI NEW YORK PA ATTN: LIBRARY SERIALS UNIT CENTRAL PK WEST AT 79TH ST, NEW YORK, NY 10024-5192 USA SN 0028-0712 J9 NAT HIST JI Nat. Hist. PD SEP PY 1998 VL 107 IS 7 BP 60 EP 63 PG 4 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 110NY UT WOS:000075388300011 ER PT J AU Frauenfelder, H Leeson, DT AF Frauenfelder, H Leeson, DT TI The energy landscape in non-biological and biological molecules SO NATURE STRUCTURAL BIOLOGY LA English DT Article ID PROTEIN; MYOGLOBIN AB The concept of energy landscapes promises to connect aspects of biology, chemistry and physics. A recent paper highlights the need for continuous exchange of information between fields to maximize the utility of this idea. C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Frauenfelder, H (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS B258, Los Alamos, NM 87545 USA. NR 16 TC 65 Z9 67 U1 0 U2 6 PU NATURE AMERICA INC PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1072-8368 J9 NAT STRUCT BIOL JI Nat. Struct. Biol. PD SEP PY 1998 VL 5 IS 9 BP 757 EP 759 DI 10.1038/1784 PG 3 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 114NB UT WOS:000075614600004 PM 9731762 ER PT J AU Shah, VN Hookham, CJ AF Shah, VN Hookham, CJ TI Long-term aging of light water reactor concrete containments SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper evaluates the aging of light water reactor concrete containments and identifies three degradation mechanisms that have the potential to cause widespread aging damage after years of satisfactory experience: alkali-silica reactions; corrosion of reinforcing steel, steel liner, and prestressing steel; and sulfate attack. The aging evaluation is based on a comprehensive review of the relevant technical literature. Low-alkali cement and slow-reacting aggregates selected according to ASTM requirements cause deleterious alkali-silica reactions. Low concentrations of chloride ions can initiate corrosion of the reinforcing steel if the hydroxyl ions are sufficiently reduced by carbonation, leaching or magnesium sulfate attack. Magnesium sulfate attack on concrete can also cause loss of strength and degradation of cementitious properties of the containment concrete after long-term exposure. The techniques for inspecting, mitigating and repairing these long-term aging effects are discussed. (C) 1998 Elsevier Science S.A. All rights reserved. C1 Lockheed Martin Idaho Technol, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Shah, VN (reprint author), Lockheed Martin Idaho Technol, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. EM vns@inel.gov NR 64 TC 13 Z9 16 U1 1 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD SEP PY 1998 VL 185 IS 1 BP 51 EP 81 DI 10.1016/S0029-5493(98)00187-3 PG 31 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 134FC UT WOS:000076731400005 ER PT J AU Medley, SS Budny, RV Duong, HH Fisher, RK Petrov, MP Gorelenkov, NN Redi, MH Roquemore, AL White, RB AF Medley, SS Budny, RV Duong, HH Fisher, RK Petrov, MP Gorelenkov, NN Redi, MH Roquemore, AL White, RB TI Confined trapped alpha behaviour in TFTR deuterium-tritium plasmas SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 5th IAEA Technical Committee Meeting on Alpha Particles in Fusion Research CY SEP 08-11, 1997 CL ABINGDON, ENGLAND SP IAEA, Tech Comm ID FUSION TEST REACTOR; REVERSED MAGNETIC SHEAR; FAST-ION TRANSPORT; DT EXPERIMENTS; PARTICLE LOSS; SAWTOOTH OSCILLATIONS; TOKAMAK; RIPPLE; REDISTRIBUTION; DETECTORS AB Confined trapped alpha energy spectra and differential radial density profiles in TFTR D-T plasmas were obtained with the pellet charge exchange (PCX) diagnostic, which measures high energy (E-alpha = 0.5-3.5 MeV) trapped alphas (v(parallel to)/v = -0.048) at a single time slice (Delta t approximate to 1 ms) with a spatial resolution of Delta r approximate to 5 cm. Tritons produced in D-D plasmas and RF driven ion tails (H, He-3 or T) were also observed and energetic tritium ion tail measurements are discussed. PCX alpha and triton energy spectra extending up to their birth energies were measured in the core of MHD quiescent discharges where the expected classical slowing down and pitch angle scattering effects are not complicated by stochastic ripple diffusion and sawtooth activity. Both the shape of the measured alpha and triton energy distributions and their density ratios are in good agreement with TRANSP predictions, indicating that the PCX measurements are consistent with classical thermalization of the fusion generated alphas and tritons. From calculations, these results set an upper limit on possible anomalous radial diffusion for trapped alphas of D-alpha less than or equal to 0.01 m(2).s(-1). Outside the core, where the trapped alphas are influenced by stochastic ripple diffusion effects, the PCX measurements are consistent with the functional dependence of the Goldston-White-Boozer stochastic ripple threshold on the alpha energy and the q profile. In the presence of strong sawtooth activity, the PCX diagnostic observes significant redistribution of the alpha signal radial profile wherein alphas are depleted in the core and redistributed to well outside the q = 1 radius, but apparently not beyond the energy dependent stochastic ripple loss boundary. The helical electric field produced during the sawtooth crash plays an essential role in modelling the sawtooth redistribution data. In sawtooth free discharge scenarios with reversed shear operation, the PCX diagnostic also observes radial profiles of the alpha signal that are significantly broader than those for supershots. ORBIT modelling of reversed shear and monotonic shear discharges is in agreement with the q dependent alpha profiles observed. Redistribution of trapped alpha particles in the presence of core localized toroidal Alfven eigenmode (TAE) activity was observed and modelling of the PCX measurements based on a synergism involving the alpha-TAE resonance and the effect of stochastic ripple diffusion is in progress. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Medley, SS (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 47 TC 17 Z9 17 U1 0 U2 3 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD SEP PY 1998 VL 38 IS 9 BP 1283 EP 1302 DI 10.1088/0029-5515/38/9/303 PG 20 WC Physics, Fluids & Plasmas SC Physics GA 128TT UT WOS:000076423200004 ER PT J AU Kimura, H Kusama, Y Saigusa, M Kramer, GJ Tobita, K Nemoto, M Kondoh, T Nishitani, T Da Costa, O Ozeki, T Oikawa, T Moriyama, S Morioka, A Fu, GY Cheng, CZ Afanas'ev, VI AF Kimura, H Kusama, Y Saigusa, M Kramer, GJ Tobita, K Nemoto, M Kondoh, T Nishitani, T Da Costa, O Ozeki, T Oikawa, T Moriyama, S Morioka, A Fu, GY Cheng, CZ Afanas'ev, VI TI Alfven eigenmode and energetic particle research in JT-60U SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 5th IAEA Technical Committee Meeting on Alpha Particles in Fusion Research CY SEP 08-11, 1997 CL ABINGDON, ENGLAND SP IAEA, Tech Comm ID REVERSED MAGNETIC SHEAR; ION-CYCLOTRON EMISSION; TOROIDAL FIELD RIPPLE; DISCHARGES; PLASMAS; STABILITY; RANGE; ICRF; TFTR; CONFINEMENT AB Recent results on investigations of Alfven eigenmodes, fast ion confinement and fast ion diagnostics in JT-60U are presented. It was found that toroidicity induced Alfven eigenmodes (TAEs) were stable in negative shear discharges with a large density gradient at the internal transport barrier (ITB). If the density gradient was small at the ITB, multiple TAEs appeared around the q = 2 surface (pitch minimum) and showed a large frequency chirping (Delta f approximate to 80 kHz). In low-q positive shear discharges, the location of the TAEs changed from outside to inside the q = 1 surface, owing to a temporal change of the q profile. A significant depression of the megaelectronvolt ion population was observed only with high-n (n up to 14) multiple TAEs inside the q = 1 surface. Non-circular triangularity induced Alfven eigenmodes were observed for the first time. Considerable depression of the triton burnup was observed in negative shear discharges. Orbit following Monte Carlo simulations indicated that ripple loss was responsible for the enhanced triton losses. The fast ion stored energies in ICRF heated negative shear discharges were comparable to those of positive shear plasmas. Tail ion temperatures in high (second to fourth) harmonic ICRF heating experiments were first analysed with an MeV neutral particle analyser. The behaviour of MeV ions produced by ICRF heating was studied with gamma ray diagnostics. A scintillating fibre detector system for detecting the 14 MeV neutron emission was developed for the triton burnup studies. Ion cyclotron emission measurements discriminating between parallel and perpendicular components of the electric field were carried out for the first time. C1 Japan Atom Energy Res Inst, Naka Fus Res Estab, Naka, Ibaraki 31101, Japan. Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. RP Kimura, H (reprint author), Japan Atom Energy Res Inst, Naka Fus Res Estab, Naka, Ibaraki 31101, Japan. EM kimuraha@naka.jaeri.go.jp RI Afanasyev, Valery/C-7657-2014; Cheng, Chio/K-1005-2014 NR 36 TC 81 Z9 86 U1 2 U2 9 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD SEP PY 1998 VL 38 IS 9 BP 1303 EP 1314 DI 10.1088/0029-5515/38/9/304 PG 12 WC Physics, Fluids & Plasmas SC Physics GA 128TT UT WOS:000076423200005 ER PT J AU Zweben, SJ Medley, SS White, RB AF Zweben, SJ Medley, SS White, RB TI Summary of alpha particle transport SO NUCLEAR FUSION LA English DT Article; Proceedings Paper CT 5th IAEA Technical Committee Meeting on Alpha Particles in Fusion Research CY SEP 08-11, 1997 CL ABINGDON, ENGLAND SP IAEA, Tech Comm AB This paper summarizes the contents of the 5th IAEA Technical Committee Meeting on Alpha Particles in Fusion Research regarding alpha particle transport, and the confinement of alpha particles. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Zweben, SJ (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 2 TC 4 Z9 4 U1 0 U2 3 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD SEP PY 1998 VL 38 IS 9 BP 1345 EP 1352 DI 10.1088/0029-5515/38/9/308 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 128TT UT WOS:000076423200009 ER PT J AU Moses, DL Chebeskov, AN Matveev, VI Vasiliev, BA Maltsev, VV AF Moses, DL Chebeskov, AN Matveev, VI Vasiliev, BA Maltsev, VV TI Plutonium disposition in the BN-600 fast-neutron reactor at the Beloyarsk nuclear power plant SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB In 1996, the United States and the Russian Federation completed an initial joint study that evaluated the candidate options for the disposition of surplus weapons-derived plutonium in both countries. While Russia advocates building new reactors for converting weapons-derived plutonium to spent Fuel, the cost is high, and the continuing joint study of the Russian options is considering only the use of the existing VVER-1000 LWRs in Russia land possibly in Ukraine) and the existing BN-600 fast-neutron reactor at the Beloyarsk Nuclear Power Plant in Russia. The BN-600 reactor, which currently uses enriched uranium fuel, is capable with certain design modifications of converting up to 1.3 metric tons (MT) of surplus weapons-derived plutonium to spent fuel each year. The steps needed to convert BN-600 to a plutonium-burner core will be discussed. The step involving the hybrid core allows an early and timely start that takes advantage of the limited capacity for fabricating uranium-plutonium mixed-oxide Fuel early in the disposition program. The design lifetime of BN-600 must safely and reliably be extended by 10 yr to at least 2020 so that a sufficient amount of plutonium (similar to 20 MT) can be converted to spent fuel. Published by Elsevier Science B.V. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Inst Phys & Power Engn, Obninsk 249020, Russia. Expt Design Bur Mech Engn, Nizhnii Novgorod 603074, Russia. Beloyarsk Nucl Power Plant, Zarechny Sverdlovsk Regi 624051, Russia. RP Moses, DL (reprint author), Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA. NR 1 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 1 PY 1998 VL 414 IS 1 BP 28 EP 35 DI 10.1016/S0168-9002(98)00524-5 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 120LL UT WOS:000075957800004 ER PT J AU Mashnik, SG Sierk, AJ Bersillon, O Gabriel, T AF Mashnik, SG Sierk, AJ Bersillon, O Gabriel, T TI Cascade-exciton model analysis of proton induced reactions from 10 MeV to 5 GeV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CROSS-SECTIONS; HIGH-ENERGIES; DECAY AB We have used an extended version of the Cascade-Exciton Model (CEM) to analyze more than 600 excitation functions for proton induced reactions on 19 targets ranging from C-12 to Au-197, for incident energies ranging from 10 MeV to 5 GeV. We have compared the calculations to available data. to calculations using approximately two dozen other models, and to predictions of several phenomenological systematics. We present here our conclusions concerning the relative roles of different reaction mechanisms in the production of specific final nuclides. We comment on the strengths and weaknesses of the CEM and suggest possible further improvements to the CEM and to other models. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Ctr Etud Bruyeres Le Chatel, CEA, F-91680 Bruyeres Le Chatel, France. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Mashnik, SG (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, T-2, Los Alamos, NM 87545 USA. NR 59 TC 28 Z9 28 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 SEP 1 PY 1998 VL 414 IS 1 BP 68 EP 72 DI 10.1016/S0168-9002(98)00529-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 120LL UT WOS:000075957800008 ER PT J AU Titarenko, YE Shvedov, OV Igumnov, MM Mashnik, SG Karpikhin, EI Kazaritsky, VD Batyaev, VF Koldobsky, AB Zhivun, VM Sosnin, AN Prael, RE Chadwick, MB Gabriel, TA Blann, M AF Titarenko, YE Shvedov, OV Igumnov, MM Mashnik, SG Karpikhin, EI Kazaritsky, VD Batyaev, VF Koldobsky, AB Zhivun, VM Sosnin, AN Prael, RE Chadwick, MB Gabriel, TA Blann, M TI Experimental and computer simulation study of the radionuclides produced in thin Bi-209 targets by 130 MeV and 1.5 GeV proton-induced reactions SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID INTRANUCLEAR-CASCADE CALCULATION; FESHBACH-KERMAN-KOONIN; ENERGY-RANGE; ELEMENTS 6-LESS-THAN-OR-EQUAL-TO-Z-LESS-THAN-OR-EQUAL-TO-29; NUCLIDE PRODUCTION; MODEL AB The results of experimental and computer simulation studies of the yields of residual product nuclei in Bi-209 thin targets irradiated by 130 MeV and 1.5 GeV protons are presented. The yields were measured by direct high-precision gamma-spectrometry. The gamma-spectrometer resolution was 1.8 keV in the 1332 keV line. The gamma-spectra were processed by the ASPRO code. The gamma-lines were identified, and the cross sections defined, by the SIGMA code using the GDISP radioactive database. The process was monitored by the Al-27(p,x)Na-24 reaction. Results are presented for comparisons between the Bi-209(p,x) reaction yields obtained experimentally and simulated by the HETC, GNASH, LAHET, INUCL, CEM95, CASCADE, and ALICE codes. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Inst Theoret & Expt Phys, SSC, Moscow 117259, Russia. Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Moscow Region, Russia. Moscow Engn Phys Inst, Moscow 115409, Russia. Joint Inst Nucl Res, Lab Comp Tech & Automat, Dubna 141980, Russia. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Titarenko, YE (reprint author), Inst Theoret & Expt Phys, SSC, B Cheremushkinskaya 25, Moscow 117259, Russia. NR 84 TC 38 Z9 38 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 SEP 1 PY 1998 VL 414 IS 1 BP 73 EP 99 DI 10.1016/S0168-9002(98)00530-0 PG 27 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 120LL UT WOS:000075957800009 ER PT J AU Neil, GR AF Neil, GR CA Jefferson Lab FEL Team TI Industrial applications of the Jefferson Lab high-power free-electron laser SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT International Symposium on Free Electron Laser Facilities and Applications (FELFA 98) CY JAN 26-29, 1998 CL KYOTO, JAPAN SP AF Off Sci Res Asian Off Aerosp Res & Dev (AFOSR/AOARD) DE linac; FEL; applications; user; materials; technology AB In partnership with the US Navy, high-technology corporations, and research universities, Jefferson Lab is building a superconducting radio-frequency (SRF) accelerator-driven free-electron laser (FEL) and is outfitting an FEL user facility. This first fourth-generation light source - a 1 kW, 3 mu m infrared (IR) laser - is the first step in a program to develop high-average-power SRF-based IR and ultraviolet (UV) FELs for multiple manufacturing applications as well as for defense-related applied research and basic scientific research. This initial FEL will be driven by a 42 MeV, 5 mA recirculating SRF linac similar to the much larger SRF linac in Jefferson Lab's 4 GeV, 200 mu A Continuous Electron Beam Accelerator Facility (CEBAF). The FEL is expected to demonstrate 75% energy recovery. Its linac will be cooled by the existing CEBAF cryogenic system. At Jefferson Lab, an infrastructure of facilities and people already supports the advance of SRF and closely related technologies in the furtherance of the lab's primary mission of nuclear and particle physics. This paper summarizes the opportunity represented by SRF-driven FELs and reports on the program now underway to develop them. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Thomas Jefferson Natl Accelerator Fac, Newport News, VA 23606 USA. RP Neil, GR (reprint author), Thomas Jefferson Natl Accelerator Fac, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 3 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD SEP PY 1998 VL 144 IS 1-4 BP 40 EP 49 DI 10.1016/S0168-583X(98)00295-X PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 121NT UT WOS:000076020700008 ER PT J AU Jiang, W Weber, WJ Thevuthasan, S McCready, DE AF Jiang, W Weber, WJ Thevuthasan, S McCready, DE TI Damage accumulation and annealing in 6H-SiC irradiated with Si+ SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID BEAM-INDUCED AMORPHIZATION; IMPLANTED SILICON-CARBIDE; INDUCED CRYSTALLINE; AMORPHOUS TRANSITION; MOLECULAR-DYNAMICS; SINGLE-CRYSTALS; ION; TEMPERATURE; RECRYSTALLIZATION; DEPENDENCE AB Damage accumulation and annealing in 6H-silicon carbide (alpha-SiC) single crystals have been studied in situ using 2.0 MeV He+ RES in a [0 0 0 1]-axial channeling geometry (RBS/C). The damage was induced by 550 keV Si+ ion implantation (30 degrees off normal) at a temperature of -110 degrees C, and the damage recovery was investigated by subsequent isochronal annealing (20 min) over the temperature range from -110 degrees C to 900 degrees C. At ion fluences below 7.5 x 10(13) Si+/cm(2) (0.04 dpa in the damage peak), only point defects appear to be created. Furthermore, the defects on the Si sublattice can be completely recovered by thermal annealing at room temperature (RT), and recovery of defects on the C sublattice is suggested. At higher fluences, amorphization occurs; however, partial damage recovery at RT is still observed, even at a fluence of 6.6 x 10(14) Si+/cm(2) (0.35 dpa in the damage peak) where a buried amorphous layer is produced. At an ion fluence of 6.0 x 10(15) Si+/cm(2) (-90 degrees C), an amorphous layer is created from the surface to a depth of 0.6 mu m. Because of recovery processes at the buried crystalline-amorphous interface, the apparent thickness of this amorphous layer decreases slightly (<10%) with increasing temperature over the range from -90 degrees C to 600 degrees C. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Jiang, W (reprint author), Pacific NW Natl Lab, POB 999,MSIN K8-93,902 Battelle Blvd, Richland, WA 99352 USA. RI Weber, William/A-4177-2008; OI Weber, William/0000-0002-9017-7365; Jiang, Weilin/0000-0001-8302-8313 NR 26 TC 41 Z9 41 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD SEP PY 1998 VL 143 IS 3 BP 333 EP 341 DI 10.1016/S0168-583X(98)00381-4 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 116EX UT WOS:000075711900010 ER PT J AU Adams, ML Wareing, TA Walters, WF AF Adams, ML Wareing, TA Walters, WF TI Characteristic methods in thick diffusive problems SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID SYNTHETIC ACCELERATION; TRANSPORT ITERATIONS; EQUATIONS; LIMIT AB The performance of characteristic methods (CMs) on problems that contain optically thick diffusive regions is analyzed and tested. The asymptotic analysis holds for moment-based characteristics methods that are algebraically linear; for one-, two-, and three-dimensional Cartesian coordinate systems; and for arbitrary spatial grids composed of polygons (two dimensions) or polyhedra (three dimensions). The analysis produces a theory that predicts and explains how CMs behave when applied to thick diffusive problems. The theory predicts that as spatial cells become optically thick and highly scattering, CMs behave almost exactly like discontinuous finite element methods (DFEMs). This means that there are two classes of CMs: those that fail dramatically on thick diffusive problems and those whose solutions satisfy discretizations of the correct diffusion equation. Most CMs in the latter set behave poorly in general, sometimes producing oscillatory and negative solutions in thick diffusive regions. However the analysis suggests that certain reduced-order CMs, which use less information on cell surfaces than is readily available, will behave more robustly in thick diffusive regions. The predictions regarding standard CMs are tested by using the linear and bilinear characteristics methods on several test problems with rectangular grids in x-y geometry The predictions regarding reduced-order CMs are tested by solving x-y test problems on triangular grids using a CM that employs linear functions for cell-interior sources but constants for cell-surface fluxes. In every case the numerical results agree precisely with the predictions of the theory. C1 Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Adams, ML (reprint author), Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA. NR 17 TC 16 Z9 16 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 USA SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD SEP PY 1998 VL 130 IS 1 BP 18 EP 46 PG 29 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 122HV UT WOS:000076066800002 ER PT J AU Mihalczo, JT Lynn, JJ Taylor, JR AF Mihalczo, JT Lynn, JJ Taylor, JR TI The central void reactivity in the Oak Ridge National Laboratory enriched uranium (93.2) metal sphere SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The reactivity worth of a central void region in the Oak Ridge National Laboratory (ORNL) unmoderated and unreflected uranium (93.20 wt% U-235) metal sphere was obtained by replacement measurements in a small (0.460-cm-diam) central spherical region in this 3.4420-in.-radius sphere. The measured central void region worth was 9.165 +/- 0.023 c using the delayed neutron parameters of Keepin, Wimett, and Zeigler to obtain the reactivity from the measured stable reactor periods. This value is slightly larger than measurements for GODIVA I with larger cylindrical samples of uranium (93.70 wt% U-235) in, the center: 135.50 +/- 0.12 c/mol for GODIVA I and 138.05 +/- 0.34 c/mol for the ORNL sphere measurements. The difference could be due to sample size effect. The central worth was also calculated by neutron transport theory methods to be 6.02 +/- 0.01 x 10(-4) Delta k. The measured and calculated values are related by the effective delayed neutron fraction. The value of the effective delayed neutron fraction obtained in this way from the ORNL sphere is 0.00657 +/- 0.00002, which is in excellent agreement with that obtained from GODIVA I measurements, where the effective delayed neutron fraction was determined as the increment between delayed and prompt criticality and was 0.0066. From these ORNL measurements, using the delayed neutron parameters of ENDF-B/VI to obtain the reactivity from the stable reactor period measurements, the central void worth is 7.984 +/- 0.021 c, and the inferred effective delayed neutron fraction is 0.00754. These values are 14.2% higher than those obtained from use of the Keepin, Wimett, and Zeigler delayed neutron data and produce a value of effective delayed neutron fraction in disagreement with GODIVA I measurements, thus questioning the usefulness of the six-group delayed neutron parameters (fast fission) of uranium from ENDF-B/VI for obtaining the reactivity from the measured reactor period using the Inhour equation. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Mihalczo, JT (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. NR 13 TC 4 Z9 4 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 USA SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD SEP PY 1998 VL 130 IS 1 BP 153 EP 163 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 122HV UT WOS:000076066800012 ER PT J AU Forsberg, CW Beahm, EC AF Forsberg, CW Beahm, EC TI Recovery of fissile materials from wastes and conversion of the residual wastes to glass SO NUCLEAR TECHNOLOGY LA English DT Article DE reprocessing; plutonium residues; waste glass AB A new process has been invented that converts complex wastes containing fissile materials into a chemical form that allows the use of existing technologies (such as Purer and ion exchange) to recover the fissile materials and convert the resultant wastes to glass. Potential feed materials include (a) uranium fissile wastes, (b) miscellaneous spent nuclear fuel, and (c) plutonium scrap and residue. The initial feed materials may contain mixtures of metals, ceramics, amorphous solids, halides, and organics. The process consists of three major sets of process operations. During the first set of operations, the feed is dissolved into molten lead-berate glass and then converted to a boron oxide (B2O3) fusion melt. During this process, (a) the organics and metals are oxidized and (b) the halides and noble metals are separated from the melt. During the second set of operations, the cooled fusion melt is dissolved into nitric acid, and the uranium and plutonium are recovered from the acid using standard aqueous separation processes such as Purer and ion exchange. During the third set of operations, standard waste vitrification processes convert the residual waste to borosilicate glass. The B2O3 can be recovered and recycled at several locations within the process. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Forsberg, CW (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM forsbergcw@ornl.gov NR 22 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 USA SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD SEP PY 1998 VL 123 IS 3 BP 341 EP 349 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 111GH UT WOS:000075428600010 ER PT J AU Allen, BL Uhlmann, F Gaur, LK Mulder, BA Posey, KL Jones, LB Hardin, SH AF Allen, BL Uhlmann, F Gaur, LK Mulder, BA Posey, KL Jones, LB Hardin, SH TI DNA recognition properties of the N-terminal DNA binding domain within the large subunit of Replication Factor C SO NUCLEIC ACIDS RESEARCH LA English DT Article ID SACCHAROMYCES-CEREVISIAE; ACCESSORY PROTEINS; CLONING; POLYMERASE; GENE; EXPRESSION; HOMOLOGY; TEMPLATE; LIGASES; REGIONS AB Replication Factor C (RFC) is a five-subunit protein complex required for eukaryotic DNA replication and repair. The large subunit within this complex contains a C-terminal DNA binding domain which provides specificity for PCNA loading at a primer-template and a second, N-terminal DNA binding domain of unknown function. We isolated the N-terminal DNA binding domain from Drosophila melanogaster and defined the region within this polypeptide required for DNA binding. The DNA determinants most efficiently recognized by both the Drosophila minimal DNA binding domain and the N-terminal half of the human large subunit consist of a double-stranded DNA containing a recessed 5' phosphate. DNA containing a recessed 5' phosphate was preferred 5-fold over hairpined DNA containing a recessed 3' hydroxyl, Combined with existing data, these DNA binding properties suggest a role for the N-terminal DNA binding domain in the recognition of phosphorylated DNA ends. C1 Texas A&M Univ, Dept Biol, College Stn, TX 77843 USA. Mem Sloan Kettering Canc Ctr, Sloan Kettering Inst, New York, NY 10021 USA. Univ Houston, Dept Biol & Biochem, Houston, TX 77204 USA. RP Hardin, SH (reprint author), Univ Calif Los Alamos Natl Lab, Div Life Sci, LS-4, Los Alamos, NM 87544 USA. FU NIGMS NIH HHS [GM123451] NR 25 TC 23 Z9 25 U1 0 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD SEP 1 PY 1998 VL 26 IS 17 BP 3877 EP 3882 DI 10.1093/nar/26.17.3877 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 117FF UT WOS:000075769700002 PM 9705493 ER PT J AU Sharpe, SW Kelly, JF Hartman, JS Gmachl, C Capasso, F Sivco, DL Baillargeon, JN Cho, AY AF Sharpe, SW Kelly, JF Hartman, JS Gmachl, C Capasso, F Sivco, DL Baillargeon, JN Cho, AY TI High-resolution (Doppler-limited) spectroscopy using quantum-cascade distributed-feedback lasers SO OPTICS LETTERS LA English DT Article AB Lasing characteristics were evaluated for distributed-feedback quantum-cascade (QC) lasers operating in a continuous mode at cryogenic temperatures. These tests were performed to determine the QC lasers' suitability for use in high-resolution spectroscopic applications, including Doppler-limited molecular absorption and pressure-limited lidar applications. By use of a rapid-scan technique, direct absorbance measurements of nitric oxide (NO) and ammonia (NH3) were performed with several QC lasers, operating at either 5.2 or 8.5 mu m. Results include time-averaged linewidths of better than 40 MHz and long-term laser frequency reproducibility, even after numerous temperature cycles, of 80 MHz or better. Tuning rates of 2.5 cm(-1) in 0.6 ms can be easily achieved. Noise-equivalent absorbance of 3 x 10(-6) was also obtained without optimizing the optical arrangement. (C) 1998 Optical Society of America. C1 Pacific NW Lab, Richland, WA USA. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. RP Sharpe, SW (reprint author), Pacific NW Lab, POB 999, Richland, WA USA. NR 12 TC 90 Z9 91 U1 1 U2 9 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 1 PY 1998 VL 23 IS 17 BP 1396 EP 1398 DI 10.1364/OL.23.001396 PG 3 WC Optics SC Optics GA 115ZX UT WOS:000075697400023 PM 18091797 ER PT J AU Kung, H Margevicius, RW AF Kung, H Margevicius, RW TI Preface - T.E. Mitchell - Papers to celebrate his sixtieth birthday SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Biographical-Item C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kung, H (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 523 EP 524 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800001 ER PT J AU Hecker, SS AF Hecker, SS TI Untitled SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Letter C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hecker, SS (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 527 EP 528 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800003 ER PT J AU Misra, A Wu, ZL Kush, MT Gibala, R AF Misra, A Wu, ZL Kush, MT Gibala, R TI Deformation and fracture behaviour of directionally solidified NiAl-Mo and NiAl-Mo(Re) eutectic composites SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID FATIGUE-CRACK GROWTH; MECHANICAL-PROPERTIES; SINGLE-CRYSTALS; ALLOY; CR; MICROSTRUCTURES; MOLYBDENUM; INTERFACE; SYSTEMS; METALS AB The mechanical behaviour of directionally solidified NiAl-Mo and NiAl-Mo(Re) eutectic alloys has been examined. The fracture toughness of a NiAl-9 at.% Mo eutectic alloy is a factor of at least two higher than that of monolithic NIAl. No single dominant toughening mechanism was identified. The toughness enhancement was attributed to a combination of intrinsic toughening of NiAl due to dislocations generated from the interfaces, crack trapping, crack deflection along interfaces and crack bridging. The Mo fibres were solid solution strengthened by Al and Ni partitioned from the NiAl matrix and had low ductility. Extensive interface debonding was noted, particularly when the fibres were either inclined or parallel to the crack plane. The deflection of the crack along the interfaces was analysed in terms of the elastic and plastic properties of the two phases. Alloying with Re was effective in reducing the hardness of Mo fibres in the composite, but also reduced the fibre alignment relative to that of the NiAl-9 at.% Mo alloys. No change in the extent of interface debonding was noted in the Re-alloyed composites. The toughnesses of NiAl-Mo(Re) and NiAl-Mo alloys were compared in the light of the differences in microstructures and effects of Re on ductility of Mo fibres. Solidification processing methods are suggested to produce NiAl-Mo(Re) alloys having completely eutectic microstructures with fibres well aligned along the growth direction to allow direct comparison with the NiAl-9 at.% Mo eutectic alloy. C1 Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA. RP Misra, A (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, MS K765, Los Alamos, NM 87545 USA. RI Misra, Amit/H-1087-2012 NR 44 TC 33 Z9 33 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 533 EP 550 PG 18 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800005 ER PT J AU Chu, F Zhu, Q Thoma, DJ Mitchell, TE AF Chu, F Zhu, Q Thoma, DJ Mitchell, TE TI Structural and defect analysis of V-alloyed C15 NbCr2 from high resolution synchrotron X-ray powder diffraction SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID LAVES-PHASE; MECHANICAL-PROPERTIES; ELECTRONIC-STRUCTURE; STABILITY; DEFORMATION; INTERMETALLICS; BEHAVIOR; SYSTEM; CR2NB; HFV2 AB The structural and defect characteristics of V-alloyed C15 Laves phase based on NbCr2 have been studied using a combination of high-resolution synchrotron X-ray powder diffraction and Rietveld structure refinement. The results show that V atoms substitute on the Cr site in the C15 structure, in spite of the fact that the atomic radii of the three elements indicate that r(Cr) < r(V) < r(Nb). It is also found that the lattice parameter increases linearly with increasing V content, suggesting a random occupancy of V on the Cr site. The alloying behaviour and the defect structures are qualitatively explained in terms of the electronic structure of C15 NbCr2 obtained by first-principles total energy and electronic structure calculations. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Chu, F (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS K765, Los Alamos, NM 87545 USA. NR 40 TC 7 Z9 8 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 551 EP 565 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800006 ER PT J AU Margevicius, RW Gumbsch, P AF Margevicius, RW Gumbsch, P TI Influence of crack propagation direction on {110} fracture toughness of gallium arsenide SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID BRITTLE DUCTILE TRANSITION; ELECTRON-MICROSCOPY; SILICON; GAAS; INDENTATION; DISLOCATION; CRYSTALS; MODEL AB Cleavage of {110} planes in a GaAs single crystal was investigated to study whether propagation direction influences the measured fracture toughness. The propagation direction for cracks on the (110) plane was varied to be [001], [112], [111], [110] and [00 (1) over bar]. Pre-cracks were introduced by Vickers hardness indents, and through-thickness-pre-crack bend bars were also tested. One orientation, (110)[(1) over bar 10], tested only with the latter method, had a substantially lower toughness than the others, suggesting the existence of one specific 'easy' propagation direction. Possible reasons for toughness differences with respect to the propagation direction are discussed. Different testing methods to resolve such issues as firstly direct determination of fracture toughness from indenter cracks, secondly bending fracture toughness experiments from indenter precracks, and thirdly bending fracture toughness experiments from through-thickness pre-cracks are critically compared for their potential to resolve toughness anisotropies. C1 Max Planck Inst Met Forsch, Inst Werkstoffwissensch, D-70174 Stuttgart, Germany. RP Margevicius, RW (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RI Schaff, William/B-5839-2009; Gumbsch, Peter/E-5879-2012 OI Gumbsch, Peter/0000-0001-7995-228X NR 23 TC 21 Z9 21 U1 0 U2 5 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 567 EP 581 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800007 ER PT J AU Donlon, WT Heuer, AH Mitchell, TE AF Donlon, WT Heuer, AH Mitchell, TE TI Compositional softening in Mg-Al spinel SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID DIFFUSION; CRYSTALS AB Deviations from stoichiometry in Mg-Al spinel (MgO . nAl(2)O(3), n > 1) cause a marked decrease in both the high-temperature critical resolved shear stress (CRSS) and the steady-state flow stress for both {111} [(1) over bar)01] and {101}[(1) over bar 01] slip. However, Arrhenius plots give activation energies and stress exponents which are essentially the same for both stoichiometric and nonstoichiometric crystals. Dislocations observed after deformation in non-stoichiometric specimens undergoing {101} slip are predominately edge in character, while 60 degrees climb-dissociated dislocations are found in specimens which have undergone (111) slip. In contrast, edge and 30 degrees dislocations are found in stoichiometric (n = 1) spinel which has undergone {111} slip (Donlon et al., 1982, Phil. Mag. A, 45, 1013). Most of the dislocations in the non-stoichiometric crystals are dissociated by climb, although some partial dislocations are seen bounding widely separated glide faults, and some dislocations have segments alternately dissociated by a combination of glide and climb. Further analysis of the CRSS data shows a linear relationship between log(CRSS) and temperature which is at least as good as the usual Arrhenius plot. In addition, the CRSS decreases as [V-c](-2) where the concentration [V-c] of cation vacancies is given by (n - 1)/[3(3n + 1)1. These relationships imply that the CRSS is controlled by a Peierls stress which is reduced by kink nucleation at cation vacancies. The activation energy is slightly lower for {101} [(1) over bar 01] slip, so that this system is favoured in non-stoichiometric compositions at lower temperatures. C1 Ford Motor Co, Sci Res Lab, Dearborn, MI USA. Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA. Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. RP Donlon, WT (reprint author), Ford Motor Co, Sci Res Lab, MD 3182, Dearborn, MI USA. NR 43 TC 12 Z9 12 U1 2 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 615 EP 641 PG 27 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800010 ER PT J AU Mitchell, JN Yu, N Sickafus, KE Nastasi, MA McClellan, KJ AF Mitchell, JN Yu, N Sickafus, KE Nastasi, MA McClellan, KJ TI Ion irradiation damage in geikielite (MgTiO3) SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID PHASE-TRANSITION; INDUCED AMORPHIZATION; MGAL2O4 SPINEL; PRESSURE; ILMENITE; DISORDER; PEROVSKITE; MNTIO3; FETIO3; POLYMORPHS AB A series of ion-irradiation experiments were conducted to explore the radiation response of the ilmenite-group oxide geikielite (MgTiO3). In these experiments, oriented single crystals were irradiated with either 200 keV Ar2+ or 400 keV Xe2+ and Rutherford back-scattering spectrometry combined with ion channelling (RBS/C) was used to characterize consequent radiation damage. In the 200 keV Ar2+ experiments, the sample was held at 100 K and a buried amorphous layer 55 nm thick formed underneath a defective crystalline layer 90 nm thick after exposure to a fluence of 2 x 10(15) ions cm(-2). More detailed experiments with 400 keV Xe2+ employed incremental ion irradiation followed by RBS/C to determine the extent and rate of radiation damage at temperatures of 170, 300 and 470 K. These irradiations show that there is a strong temperature dependence for damage accumulation and that critical amorphization fluences increase from 2 x 10(15) Xe2+ cm(-2) (170 K) to 6 x 10(15) Xe2+ cm(-2) (300 K) to greater than 2.5 x 10(16) Xe2+ cm(-2) (470 K). Damage appears to accumulate in several stages, with a rapid initial growth that levels at an intermediate stage. This is followed by an increase in and, eventually, saturation in the damage rare. At 170 and 300 K the damage fraction saturates at 100%, whereas saturation occurs at about 80% at 470 K. RBS/C data suggest the possible formation of a radiation-induced metastable phase in the damaged region, which may be analogous to pressure- or temperature-induced phase transformations in other ilmenite-group oxides. In particular, these materials transform to either the lithium niobate or the orthorhombic perovskite structure at high pressures and temperatures. The results presented in this study and similar investigations on the olivine system suggest that ionicity, composition and melting temperature may play important roles in the radiation response of ceramics, and particularly in predicting the relative radiation tolerance of materials within a solid-solution series. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Mitchell, JN (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. NR 42 TC 6 Z9 6 U1 0 U2 6 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 713 EP 725 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800015 ER PT J AU Heuer, AH Lagerlof, KPD Castaing, J AF Heuer, AH Lagerlof, KPD Castaing, J TI Slip and twinning dislocations in sapphire (alpha-Al2O3) SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID BASAL SLIP AB The 1/3[10 (1) over bar 0] partial dislocation plays a crucial role in the plastic deformation of sapphire (alpha-Al2O3). During deformation at high temperatures, basal slip (1/3(11 (2) over bar 0)(0001)) has the lowest critical resolved shear stress; 1/3[11 (2) over bar 0] perfect dislocations undergo dissociation (which is probably restricted to the dislocation core) to 1/3[10 (1) over bar 0] and 1/3[01 (1) over bar 0] half-partial dislocations. These partials glide on an electrically neutral motion plane within a puckered cation array. The 1/3[10 (1) over bar 0] partial also acts as the twinning partial when basal twinning occurs at intermediate temperatures, say 600-1000 degrees C. Twinning occurs when a pinned screw partial sweeps out on this same motion plane, forms a complete loop of a microtwin and then cross-slips onto the next available motion plane to permit twin thickening. New transmission electron microscopy evidence is presented, confirming several predictions of this new model of basal twinning. Prism plane slip ([10 (1) over bar 0] {1 (2) over bar 10}) is actually the preferred slip system at lower temperatures (below about 600 degrees C). in spite of the very large Burgers vector of the [10 (1) over bar 0] dislocation, 0.822 nm. This occurs because this dislocation dissociates into three colinear 1/3[10 (1) over bar 0] partials, separated by two relatively low-energy slacking faults. (The stacking-fault energy in sapphire is much lower on prism planes than on basal planes.) The motion plane for prism plane slip is between two puckered oxygen layers but also permits dislocation motion with no net change. C1 Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA. Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. RP Heuer, AH (reprint author), Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA. NR 25 TC 50 Z9 51 U1 2 U2 20 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 747 EP 763 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800018 ER PT J AU Chen, SJ Howitt, DG AF Chen, SJ Howitt, DG TI Observations of partial dislocations and basal twin boundaries in shock-wave-deformed sapphire SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article; Proceedings Paper CT Workshop on Defects in Crystals CY MAY, 1997 CL LOS ALAMOS NATL LAB, LOS ALAMOS, NEW MEXICO HO LOS ALAMOS NATL LAB ID ALUMINUM-OXIDE; ALPHA-AL2O3; DEFORMATION; SLIP AB Basal twins and 1/3[10 (1) over bar 0] partial dislocations are two of the most commonly observed microstructures in shock-wave-deformed sapphire. The relationship between them, established by transmission electron microscopy, is that the partial dislocations are the twinning dislocation for basal twins. In the light of this observation: the existing dislocation theories for the basal twinning are discussed. C1 Univ Calif Davis, Dept Chem Engn & Mat Sci, Livermore, CA 95616 USA. RP Chen, SJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 19 TC 13 Z9 13 U1 1 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD SEP PY 1998 VL 78 IS 3 BP 765 EP 776 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 115KQ UT WOS:000075663800019 ER PT J AU Wu, LJ Zhu, JM Suenaga, M AF Wu, LJ Zhu, JM Suenaga, M TI Crystallographic analysis of the intermediate phases observed during the conversion of (Bi, Pb)(2)Sr2CaCu2O8+delta to (Bi, Pb)(2)Sr2Ca2Cu3O10+delta in composite tapes SO PHYSICA C LA English DT Article DE crystallographic analysis; composite tapes; Bi/2212; Bi/2223 ID (BI,PB)(2)SR2CA2CU3O10+DELTA PHASE; SUPERCONDUCTING PHASE; FORMATION MECHANISM; BI(2223) TAPES; PB; BI2SR2CA2CU3O10+DELTA; TRANSFORMATION; TEMPERATURE; STABILITY; KINETICS AB We report our crystallographic analysis of three major intermediate phases during the conversion of (Bi, Pb)(2)Sr2CaCu2O8+delta (Bi/2212) to (Bi, Pb)(2)Sr2Ca2Cu3O10+delta (Bi/2223) phase in Ag-sheathed composite tapes. The intermediate phase (Ca, Sr)(5+x)(Pb, Bi)(3+y)CuO has a c-centered monoclinic lattice with a = 1.723 nm, b = 0.975 nm, c = 0.342 nm, and alpha = 93.5 degrees; while both (Ca, Sr)CuO2 and (Ca, Sr)(14)Cu24O41+delta are phase mixtures with nano-precipitates randomly imbedded in their matrix. The structure of the matrix for the former has face-centered monoclinic symmetry with a = 1.105 nm, b = 0.643 nm, c = 0.347 nm, and beta = 92.3 degrees; the precipitates for the latter are face-centered orthorhombic with a = 1.147 nm, b = 1.339 nm, and c = 0.277 nm. We discuss the structural evolution of these intermediate phases and their relation to Bi/2212 and Bi/2223, (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. RP Wu, LJ (reprint author), Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. EM ljwu@bnl.gov NR 27 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD SEP 1 PY 1998 VL 305 IS 3-4 BP 167 EP 178 DI 10.1016/S0921-4534(98)00343-8 PG 12 WC Physics, Applied SC Physics GA 126WU UT WOS:000076318300002 ER PT J AU Benioff, P AF Benioff, P TI The Landauer resistance and band spectra for the counting quantum turing machine SO PHYSICA D LA English DT Article; Proceedings Paper CT 4th Workshop on Physics and Computation (PhyComp96) CY NOV 22-24, 1996 CL BOSTON, MASSACHUSETTS ID THUE-MORSE; COMPUTERS; UNIVERSAL; SYSTEMS; COMPUTATION; LATTICES; LOGIC AB In other work, the generalized counting quantum turing machine (GCQTM) was studied. For any N this machine enumerates the first 2(N) integers in succession as binary strings. The generalization consists of associating a potential with read 1 steps only. The Landauer resistance (LR) and band spectra were determined for the tight binding Hamiltonians associated with the GCQTM for energies below the potential height. Here these calculations are extended to energies both above and below the barrier height. For parameters and potentials in the electron region, the LR fluctuates rapidly between very high and very low values as a function of momentum. The rapidity and extent of the fluctuations increases rapidly with increasing N. For N = 18, the largest value considered, the LR shows good transmission probability as a function of momentum with numerous holes of very high LR values present. This is true for energies both above and below the potential height. It is suggested that the main features of the LR can be explained by coherent superposition of the component waves reflected from or transmitted through or across the 2(N-1) potentials present in the distribution. If this explanation is correct, it provides a dramatic illustration of the effects of quantum nonlocality. Published by Elsevier Science B.V. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Benioff, P (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 31 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 1 PY 1998 VL 120 IS 1-2 BP 12 EP 29 DI 10.1016/S0167-2789(98)00041-4 PG 18 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA 107EF UT WOS:000075193500002 ER PT J AU Jacquemot, S Cornille, M Nilsen, J AF Jacquemot, S Cornille, M Nilsen, J TI Dielectronic recombination for F-like and Ne-like ions SO PHYSICA SCRIPTA LA English DT Article ID AUTOIONIZATION RATES; RATE COEFFICIENTS; SELENIUM; SEQUENCE; SYSTEMS; STATES AB Energy levels, radiative and Anger rates have been explicitly calculated for ten ions, with atomic number ranging from Z = 22 to Z = 47, to describe dielectronic recombination into the n = 3 neon-like and sodium-like levels, by using the multiconfigurational AUTOLSJ method in intermediate coup hug Averaged coefficients have been deduced from the detailed computed results to allow their easy incorporation into kinetics simulations and compared to those obtained by the multiconfigurational Dirac-Fock method, through the YODA code. C1 CEA, Ctr Etud Limeil Valenton, F-94195 Villeneuve St Georges, France. Observ Paris, CNRS, DARC, UPR 176, F-92195 Meudon, France. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Jacquemot, S (reprint author), CEA, Ctr Etud Limeil Valenton, F-94195 Villeneuve St Georges, France. NR 29 TC 2 Z9 2 U1 0 U2 1 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD SEP PY 1998 VL 58 IS 3 BP 203 EP 219 DI 10.1088/0031-8949/58/3/003 PG 17 WC Physics, Multidisciplinary SC Physics GA 118PR UT WOS:000075847900003 ER PT J AU Gubanov, VA Wright, AF Nelson, JS Fong, CY Lu, ZW Klein, BM Hamann, DR AF Gubanov, VA Wright, AF Nelson, JS Fong, CY Lu, ZW Klein, BM Hamann, DR TI Electronic structure of a nitrogen vacancy in cubic gallium nitride SO PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; HYDROSTATIC-PRESSURE; OPTICAL-PROPERTIES; ELASTIC-CONSTANTS; NATIVE DEFECTS; GAN EPILAYERS; HEXAGONAL GAN; 001 SILICON; THIN-FILMS; PHOTOLUMINESCENCE AB The electronic structure of a nitrogen vacancy in zinc-blende GaN has been calculated using two different supercells with the plane-wave pseudopotential (PWPP) and the tight-binding linear muffin-tin orbitals (TB-LMTO) methods. The Ga 3d states are included in the valence states. Relaxation near a nitrogen vacancy site was examined with the PWPP method using a 31-atom unit cell. The nearest neighbor Ga atoms were found to move toward the vacancy site by 0.04 Angstrom resulting in a relaxation energy of only 0.04 eV. Given the absence of large relaxations, TB-LMTO calculations were then performed for 31- and 63-atom unit cells using an ideal (unrelaxed) geometry. Densities of states and charge density maps show that a nitrogen vacancy can induce a partially filled band, which overlaps with the conduction states, resulting in n-type conductivity The energy shift of this band under pressure was investigated for volume compressions up to 12% and compared with results from recent high-pressure measurements for GaN. C1 San Jose State Univ, Dept Phys, San Jose, CA 96192 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Calif Davis, Dept Phys, Livermore, CA 95616 USA. AT&T Bell Labs, Murray Hill, NJ 07974 USA. RP San Jose State Univ, Dept Phys, San Jose, CA 96192 USA. NR 57 TC 4 Z9 4 U1 2 U2 6 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA POSTFACH 101161, 69451 WEINHEIM, GERMANY SN 0370-1972 EI 1521-3951 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Solid State Phys. PD SEP PY 1998 VL 209 IS 1 BP 63 EP 79 DI 10.1002/(SICI)1521-3951(199809)209:1<63::AID-PSSB63>3.0.CO;2-4 PG 17 WC Physics, Condensed Matter SC Physics GA 121ZX UT WOS:000076046900010 ER PT J AU Reginatto, M AF Reginatto, M TI Derivation of the equations of nonrelativistic quantum mechanics using the principle of minimum Fisher information SO PHYSICAL REVIEW A LA English DT Article AB The many-particle time-dependent Schrodinger equation is derived using the principle of minimum Fisher information. This application of information theory leads to a physically well motivated derivation of the Schrodinger equation, which distinguishes between subjective and objective elements of the theory. C1 US DOE, Environm Measurements Lab, New York, NY 10014 USA. RP Reginatto, M (reprint author), US DOE, Environm Measurements Lab, New York, NY 10014 USA. NR 8 TC 113 Z9 113 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 SEP PY 1998 VL 58 IS 3 BP 1775 EP 1778 DI 10.1103/PhysRevA.58.1775 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200021 ER PT J AU Rislove, DC Strauss, CEM Bryant, HC Gulley, MS Funk, DJ Zhao, XM Miller, WA AF Rislove, DC Strauss, CEM Bryant, HC Gulley, MS Funk, DJ Zhao, XM Miller, WA TI Characterization of the D-1(e) autodetaching resonance in H- and D- SO PHYSICAL REVIEW A LA English DT Article ID EXCESS-PHOTON DETACHMENT; ATOMIC-HYDROGEN; MULTIPHOTON IONIZATION; 2-PHOTON DETACHMENT; NEGATIVE-ION; ELECTRON; SCATTERING; THRESHOLD; FIELD AB We have measured the hydrogen-deuterium isotope shift in the energy of the lowest D-1(e) autodetaching resonance in the two-photon absorption spectrum of H-. The D-1(e) resonance in negative deuterium lies 2.0 +/-0.5 meV, with a possible systematic error of 0.4 meV, above the corresponding resonance in negative hydrogen when measured with respect to the ion ground state. From the isotope shift, we obtain a mass polarization of 2.4+/-1.1 meV, with a possible sytematic error of 0.8 meV, for the D-1(e) in H- under the assumption that the Fano shape parameters, q, for the two isotopes are the same. Recent theoretical calculations give the mass polarization for this resonance in H- as -0.1 meV. The generalized absolute cross section of two-photon absorption at the peak of the D-1(e) is found to be (3.2(-1.2)(+1.8))x10(-49) cm(4) s. The measured asymmetry parameters beta(2) and beta(4) of the photodetachment process are 1.9+/-1.2 and 2.21+/-0.45, respectively, consistent with a pure D-wave distribution. Upper bounds on the second recursion of the lowest S-1(e) resonance and three-photon excess photon detachment are 2.8x10(-49) cm(4) s and 3.1x10(-78) cm(6) s(2), respectively. C1 Univ New Mexico, Albuquerque, NM 87131 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Cirrus Log Inc, Austin, TX 78744 USA. RP Rislove, DC (reprint author), Univ New Mexico, Albuquerque, NM 87131 USA. NR 37 TC 29 Z9 29 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 1889 EP 1897 DI 10.1103/PhysRevA.58.1889 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200036 ER PT J AU Beiersdorfer, P Osterheld, AL Elliott, SR AF Beiersdorfer, P Osterheld, AL Elliott, SR TI Measurements and modeling of electric-dipole-forbidden 2p(1/2)-2p(3/2) transitions in fluorinelike U81+ through berylliumlike U88+ SO PHYSICAL REVIEW A LA English DT Article ID BEAM ION-TRAP; LAMB SHIFT; 2S(1/2)-2P(3/2) LEVELS; URANIUM IONS; GROUND-STATE; ENERGIES; COMPLEX; SPECTRA; TOKAMAK; XXVIII AB We report the observation of electric-dipole-forbidden 2p(1/2)-2p(3/2) transitions in berylliumlike, boronlike, carbonlike, nitrogenlike, oxygenlike, and fluorinelike uranium. Our measurement identified nine magnetic dipole transitions, as well as one strong electric quadrupole transition in carbonlike U86+ that has not been observed in lower-Z ions because of collisional quenching. The measurement was carried out with a high-resolution crystal spectrometer, and an accuracy as good as 35 ppm was obtained in the determination of the transition energies. The transitions are significantly less affected by quantum electrodynamical effects than analogous electric-dipole-allowed transitions in these ions. The data thus provide benchmarks for theoretical approaches of electron-electron correlation effects in the high-Z limit Z alpha approximate to 1 that complement earlier measurements of 2s-2p transitions in such highly charged ions. The accuracy of the present measurements, however, was sufficient to determine the residual contributions from quantum electrodynamics (about 2 eV) with an accuracy of 5%, i.e., with an accuracy comparable to that of the best measurements of such contributions to the Is ground level in hydrogenic U91+. The contributions from quantum electrodynamics are in large part due to the vacuum polarization terms. The 2p(1/2)-2p(3/2) transition energies thus provide a handle for testing the accuracy of vacuum polarization terms nearly independent of the terms arising from the electron self energy. Results from collisional-radiative calculations are presented that show that the forbidden lines are almost exclusively produced by indirect processes, i.e., radiative cascades, radiative electron capture, and the ionization of 2p(1/2) electrons. This is in stark contrast to the electric dipole-allowed transitions, which are mostly populated by direct electron-impact excitation. C1 Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Technol, Livermore, CA 94551 USA. RP Beiersdorfer, P (reprint author), Univ Calif Lawrence Livermore Natl Lab, Dept Phys & Space Technol, Livermore, CA 94551 USA. NR 29 TC 9 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 1944 EP 1953 DI 10.1103/PhysRevA.58.1944 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200042 ER PT J AU Bechthold, U Ullrich, J Ramm, U Kraft, G Hagmann, S Schultz, DR Reinhold, CO Schmidt-Bocking, H AF Bechthold, U Ullrich, J Ramm, U Kraft, G Hagmann, S Schultz, DR Reinhold, CO Schmidt-Bocking, H TI Binary-encounter electron emission after fast heavy-ion impact on complex rare- and molecular-gas targets SO PHYSICAL REVIEW A LA English DT Article ID CHARGE-STATE DEPENDENCE; ATOM COLLISIONS; ANGULAR-DISTRIBUTION; CONTINUUM STATES; HE; IONIZATION; PEAK; 0-DEGREES; HELIUM; EXCHANGE AB Doubly differential cross sections (DDCSs) for electron emission have been measured for collisions of 3.6 MeV/u Ne10+, Xe40+ and 5.9 MeV/u U29+ On neon, xenon, water, ethanol, methanol, propanol, C2F6, SF6, and C3F8. Electrons ejected with emission angles between 0 degrees and 180 degrees with respect to the ion beam axis have been recorded simultaneously using a toroidal electron spectrometer. We analyze the singly differential cross section (SDCS) for binary encounter electron (BEe) production as a function of target electron number and laboratory emission angle. We find that there exists a linear scaling of the BEe SDCS with the number of electrons bound in the target with an energy lower than the reduced projectile energy. The enhancement of BEe production in the forward direction in collisions with partially stripped ions is studied for the different projectiles and targets and compared to theoretical calculations. C1 Gesell Schwerionenforsch GmbH, D-64291 Darmstadt, Germany. Kansas State Univ, JR Macdonald Lab, Manhattan, KS 66506 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Inst Kernphys, D-60486 Frankfurt, Germany. RP Bechthold, U (reprint author), Gesell Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany. OI Reinhold, Carlos/0000-0003-0100-4962 NR 44 TC 11 Z9 11 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 1971 EP 1979 DI 10.1103/PhysRevA.58.1971 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200046 ER PT J AU Stohlker, T Ludziejewski, T Reich, H Bosch, F Dunford, RW Eichler, J Franzke, B Kozhuharov, C Menzel, G Mokler, PH Nolden, F Rymuza, P Stachura, Z Steck, M Swiat, P Warczak, A Winkler, T AF Stohlker, T Ludziejewski, T Reich, H Bosch, F Dunford, RW Eichler, J Franzke, B Kozhuharov, C Menzel, G Mokler, PH Nolden, F Rymuza, P Stachura, Z Steck, M Swiat, P Warczak, A Winkler, T TI Charge-exchange cross sections and beam lifetimes for stored and decelerated bare uranium ions SO PHYSICAL REVIEW A LA English DT Article ID RELATIVISTIC HEAVY-IONS; RADIATIVE ELECTRON-CAPTURE; ATOMIC-COLLISIONS; SHELL IONIZATION; PAIR-PRODUCTION; H-LIKE; TARGET; STATE AB Charge-exchange cross sections and beam lifetimes are studied for decelerated bare uranium ions at the ESR storage ring. By deceleration from the initial energy of 358 MeV/u down to various energies as low as 49 MeV/u, i.e., far below the production energy of bare ionic species, the electron pickup cross sections were obtained for collisions with N-2, Ar, CH4, and Kr gaseous targets. The measured cross sections and beam lifetimes are compared with the theoretical results for radiative and nonradiative electron capture. The present data, along with the theoretical approximations discussed, provide a solid basis for the estimation of beam lifetimes for decelerated bare high-Z ions. Moreover, a normalization procedure is proposed, in which absolute total charge-exchange cross sections are derived by normalizing the simultaneously measured yield of radiative electron capture photons to rigorously calculated relativistic cross sections. This method, along with the unprecedented beam conditions at the ESR storage ring, allows a significant improvement of the accuracy of cross-section data. C1 Gesell Schwerionenforsch, D-64220 Darmstadt, Germany. Univ Frankfurt, Inst Kernphys, D-6000 Frankfurt, Germany. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Hahn Meitner Inst Kernforsch Berlin GmbH, Bereich Theoret Phys, D-14109 Berlin, Germany. Free Univ Berlin, Fachbereich Phys, D-1000 Berlin, Germany. Soltan Inst Nucl Studies, PL-05400 Otwock, Poland. Inst Nucl Phys, PL-31342 Krakow, Poland. Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland. RP Stohlker, T (reprint author), Gesell Schwerionenforsch, D-64220 Darmstadt, Germany. NR 36 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 2043 EP 2050 DI 10.1103/PhysRevA.58.2043 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200056 ER PT J AU Kurpick, P Reinhold, CO Burgdorfer, J Gervais, B AF Kurpick, P Reinhold, CO Burgdorfer, J Gervais, B TI Excited-state subshell population of hydrogen atoms after transmission of relativistic H- ions through thin foils SO PHYSICAL REVIEW A LA English DT Article ID SIMULATION; COLLISIONS; FIELD AB We present a theoretical study of the transmission of relativistic H- ions through thin carbon foils for a broad range of beam energies, Our study is based on a Monte Carlo solution of the Langevin equation describing electronic excitations of the atoms during the transport through the foil. We present calculations for the subshell populations of outgoing hydrogen atoms and we show that there exists a propensity for populating extreme Stark states. Our results are found to be in good agreement with recent experimental data. We analyze the effect of a laboratory magnetic field on the population dynamics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. CEA, CNRS, Ctr Interdisciplinaire Rech Ions Lourds, Lab Mixte, F-14040 Caen, France. RP Kurpick, P (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 24 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 2183 EP 2190 DI 10.1103/PhysRevA.58.2183 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200070 ER PT J AU Yoshida, S Reinhold, CO Burgdorfer, J Tannian, BE Popple, RA Dunning, FB AF Yoshida, S Reinhold, CO Burgdorfer, J Tannian, BE Popple, RA Dunning, FB TI Accurate ionization thresholds of atoms subject to half-cycle pulses SO PHYSICAL REVIEW A LA English DT Article ID ORIENTED RYDBERG STATES; ELECTROMAGNETIC PULSES; STARK STATES; HYDROGEN; SUBPICOSECOND; INTERFERENCE; RESONANCES; SCATTERING; DYNAMICS; FIELDS AB The evolution of Rydberg states of hydrogen and alkali-metal atoms subject to short half-cycle pulses is studied. The convergence of the numerical solutions of the time-dependent Schrodinger equation based on an expansion of the electronic wave function in a finite basis set of Sturmian functions is analyzed in detail. It is shown that the accuracy of such calculations can be established by investigating the stabilization of the transition probabilities with respect to the parameters that define the basis set. The dependence of the quantum and classical ionization thresholds on the pulse shape is investigated. The calculations are compared with experimental data for various pulse profiles, which feature slow or fast rise times. The results show that the ionization thresholds for long pulses are very sensitive to the rise time of the electric field. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Tennessee, Knoxville, TN 37996 USA. Rice Univ, Dept Phys, Houston, TX 77251 USA. Rice Univ, Rice Quantum Inst, Houston, TX 77251 USA. RP Yoshida, S (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 36 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP 2229 EP 2241 DI 10.1103/PhysRevA.58.2229 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200076 ER PT J AU Reinhold, CO Schultz, DR Bechthold, U Kraft, G Hagmann, S Schmidt-Bocking, H AF Reinhold, CO Schultz, DR Bechthold, U Kraft, G Hagmann, S Schmidt-Bocking, H TI Ternary ridge of ejected electrons from fast ion-atom collisions SO PHYSICAL REVIEW A LA English DT Article ID CLUSTER-IMPACT FUSION; SURFACE COLLISIONS; DOUBLE SCATTERING; CHARGE-TRANSFER; CROSS-SECTIONS; IONIZATION; EMISSION; PEAK; HE; DIFFRACTION AB We present a theoretical analysis of the spectrum of swift electrons resulting from collisions of 5.9 MeV/u U29+ With Xe atoms. Our calculations include, within an independent model, all sources of electrons (i.e., target L-O shells and projectile O-P shells). We show that there exists clear evidence for a ternary ridge of swift electrons originating from head-on collisions between target electrons and the impinging projectile followed by elastic scattering at the target core. These findings provide a theoretical confirmation of an experimental observation of a ternary ridge in isolated ion-atom collisions. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Gesell Schwerionenforsch GmbH, D-64291 Darmstadt, Germany. Kansas State Univ, JR Macdonald Lab, Manhattan, KS 66506 USA. Inst Kernphys, D-60486 Frankfurt, Germany. RP Reinhold, CO (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 21 TC 12 Z9 12 U1 0 U2 10 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 SEP PY 1998 VL 58 IS 3 BP 2611 EP 2614 DI 10.1103/PhysRevA.58.2611 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200121 ER PT J AU Guckert, R Zhao, X Crane, SG Hime, A Taylor, WA Tupa, D Vieira, DJ Wollnik, H AF Guckert, R Zhao, X Crane, SG Hime, A Taylor, WA Tupa, D Vieira, DJ Wollnik, H TI Magneto-optical trapping of radioactive Rb-82 atoms SO PHYSICAL REVIEW A LA English DT Article AB We report the successful trapping of 6 x 10(6) Rb-82 (t(1/2) = 75 S) atoms with a trap lifetime of similar to 30 s in a magneto-optical trap that is coupled to an off-line mass separator. Efficient sample introduction is achieved by implanting Rb-82 ions into a small yttrium catcher foil located inside the trapping cell. Upon heating, the radioactive atoms are released from the foil and trapped without significant gas loading. This advancement makes a variety of high-precision electroweak interaction experiments possible, including the measurement of beta-decay correlations associated with spin-polarized Rb-82 nuclei. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Justus Liebig Univeritat Giessen, Inst Phys 2, D-35392 Giessen, Germany. Utah State Univ, Dept Phys, Logan, UT 84322 USA. RP Guckert, R (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 14 TC 20 Z9 20 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP PY 1998 VL 58 IS 3 BP R1637 EP R1640 DI 10.1103/PhysRevA.58.R1637 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 116MY UT WOS:000075730200002 ER PT J AU Becker, JD Wills, JM Cox, L Cooper, BR AF Becker, JD Wills, JM Cox, L Cooper, BR TI Calculated lattice relaxation in Pu-Ga SO PHYSICAL REVIEW B LA English DT Article ID PLUTONIUM; SPECTROSCOPY; LOCALIZATION; SYSTEMS; METALS AB The thermodynamic behavior of the high-temperature delta (fcc) phase of plutonium is highly anomalous. It has been well established that ab initio, local-density-approximation (LDA) calculations predict an overbonding and consequent overly large density to a much greater degree in delta-plutonium than in any other metallic phases for which such calculations have been reported (including (alpha-Pu). Small amounts of gallium stabilize the delta structure, at least kinetically, to below room temperature. To investigate the relaxation of Pu neighbors of Ga, presumably related to the delta stabilization, LDA force calculations are performed with a full-potential linear combination of muffin-tin orbitals method. Calculated relaxations are about one half or less of those observed by x-ray-absorption fine-structure spectroscopy, and this discrepancy is briefly discussed. C1 Los Alamos Natl Lab, ESA, EA, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Nucl Mat Technol Div MS P946, Los Alamos, NM 87545 USA. W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA. RP Los Alamos Natl Lab, ESA, EA, Div Theoret, Los Alamos, NM 87545 USA. NR 16 TC 11 Z9 11 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 9 BP 5143 EP 5145 DI 10.1103/PhysRevB.58.5143 PG 3 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100003 ER PT J AU Hicks, TJ Cable, JW AF Hicks, TJ Cable, JW TI Moment clouds in CuMn SO PHYSICAL REVIEW B LA English DT Article ID SPIN-GLASS AB Advantage was taken of the high magnetic susceptibility of Cu-Mn alloys in the range 12 to 22 at. % Mn to observe field-dependent magnetic neutron scattering from a single crystal containing 21.3 at. % Mn. The scattering was measured with unpolarized neutrons at low angles and between the (1,0,0) and (1,1/2,0) positions in reciprocal space using a neutron energy of 14.8 MeV. The magnetic scattering was approximately uniformly reduced by about 10% at 4.2 K after warming above the glass temperature and cooling again to 4.2 K in a field of 4.25 T. Reduction of the intensity of all magnetic features by the application of the field indicates that all the magnetic periodicities are intimately connected to the uniform magnetic response. A model which assumes that the alloy contains entities with both a ferromagnetic moment associated with the (0,0,0) scattering and an antiferromagnetic periodicity associated with the (1,1/2-delta,0) scattering yields a ferromagnetic moment for the entity of 36 mu(B) estimated from the reduction in scattering. This compares with 42 mu(B) estimated from the intensity and width of the low angle. scattering. C1 Monash Univ, Dept Phys, Clayton, Vic 3168, Australia. ORNL, Div Solid State, Oak Ridge, TN USA. RP Hicks, TJ (reprint author), Monash Univ, Dept Phys, Clayton, Vic 3168, Australia. NR 10 TC 4 Z9 4 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 SEP 1 PY 1998 VL 58 IS 9 BP 5177 EP 5180 DI 10.1103/PhysRevB.58.5177 PG 4 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100013 ER PT J AU Roy, M Mitchell, JF Ramirez, AP Schiffer, P AF Roy, M Mitchell, JF Ramirez, AP Schiffer, P TI Doping-induced transition from double exchange to charge order in La1-xCaxMnO3 near x = 0.50 SO PHYSICAL REVIEW B LA English DT Article ID METAL-INSULATOR-TRANSITION; COLOSSAL-MAGNETORESISTANCE; MAGNETIC-FIELD; GIANT MAGNETORESISTANCE; PHASE-DIAGRAM; DOPED LAMNO3; LA1-XSRXMNO3; MANGANITES; TRANSPORT; FILMS AB We study a series of the perovskite manganite compounds La1-xCaxMnO3 closely spaced in doping near x = 0.50 where the ground state undergoes a doping-dependent metal-insulator transition (MIT) from a metallic to a charge-ordered state. A significant difference is found between the value of x and the Mn+4 fraction which defines the metal-insulator phase boundary. In the immediate doping regime of the MIT, the resistivity data can be quantitatively described by a model based on the coexistence of two carrier types: nearly localized carriers in the charge-ordered state exhibiting variable-range hopping and a parasitic population of free carriers which is tunable by either magnetic field or stoichiometry. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. RP Schiffer, P (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RI Schiffer, Peter/F-3227-2011; OI Schiffer, Peter/0000-0002-6430-6549 NR 41 TC 60 Z9 61 U1 2 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 SEP 1 PY 1998 VL 58 IS 9 BP 5185 EP 5188 DI 10.1103/PhysRevB.58.5185 PG 4 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100015 ER PT J AU Vergara, I Gonzalez, R Ramirez, R Santiuste, JEM Chen, Y AF Vergara, I Gonzalez, R Ramirez, R Santiuste, JEM Chen, Y TI Laser-induced-impurity colloid formation and dissociation in MgO single crystals SO PHYSICAL REVIEW B LA English DT Article ID POSITIVE-ION EMISSION; DOPED MGO; ELECTRON-MICROSCOPE; SILVER COLLOIDS; NICKEL COLLOIDS; MAGNESIUM-OXIDE; RADIATION; SAPPHIRE; LITHIUM; CAO AB Optical-absorption measurements were used to monitor impurity precipitation and dissociation of precipitates in both laser-irradiated and furnace-annealed MgO single crystals doped with Li, Co, or Ni impurities. In as-grown MgO:Li crystals, both Li2O precipitates and isolated substitutional Li+ ions are present; oxidation above 1100 K disperses lithium ions from the precipitates and forms stable [Li](0) centers (substitutional Li+ ions, each with a trapped hole) around the precipitates. Laser-induced experiments showed that both lithium precipitation and dispersion were enhanced by the presence of cracks in the samples. A cross-section value of 0.2 bs was obtained for Li displacement, indicating that the diffusion of lithium occurs via a thermal process rather than a radiation-induced diffusion, as in the case of ionizing radiation. In MgO:Co crystals, metallic colloids were produced by thermochemical reduction at high temperatures that resulted in an extinction band at 3.7 eV due to Mie scattering from the precipitates. Dissociation of cobalt precipitates was produced under laser irradiation. An activation energy of 3.0 eV and a cross section of 0.01 b s was obtained for displacement of cobalt ions from the precipitates. Laser-induced desorption and ablation was observed when the laser was focused on the crystal. In nickel-doped MgO crystals, an activation energy of 1.9 eV was determined for displacement of Ni ions from the metallic nickel precipitates. In such crystals, different patterns can be inscribed with the laser. C1 Univ Carlos III Madrid, Dept Fis, Escuela Politecn Super, E-28911 Madrid, Spain. US Dept Energy, Div Mat Sci ER 131, Washington, DC 20585 USA. RP Vergara, I (reprint author), Univ Carlos III Madrid, Dept Fis, Escuela Politecn Super, Butarque 15, E-28911 Madrid, Spain. RI Ramirez Jimenez, Rafael/I-1769-2015; Munoz Santiuste, Juan/K-7461-2015 OI Munoz Santiuste, Juan/0000-0001-6286-139X NR 43 TC 4 Z9 4 U1 1 U2 7 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 SEP 1 PY 1998 VL 58 IS 9 BP 5236 EP 5242 DI 10.1103/PhysRevB.58.5236 PG 7 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100028 ER PT J AU Smith, E AF Smith, E TI Localization in nonuniform media: Exponential decay of the late-time Ginzburg-Landau impulse response SO PHYSICAL REVIEW B LA English DT Article AB Instanton methods have been used, in the context of a classical Ginzburg-Landau field theory, to compute the averaged density of states and probability Green's function for electrons scattered by statistically uniform site energy perturbations. At tree level, all states below some critical energy appear localized, and all states above extended. The same methods are applied here to macroscopically nonuniform systems, for which it is shown that localized and extended states can be coupled through a tunneling barrier created by the instanton background. Both electronic and acoustic systems are considered. An incoherent exponential decay is predicted for the late-time impulse response in both cases, valid for long-wavelength nonuniformity, and scaling relations are derived for the decay time constant as a function of energy or frequency and spatial dimension. The acoustic results are found to lie within a range of scaling relations obtained empirically from measurements of seismic coda, suggesting a connection between the universal properties of localization and the robustness of the observed scaling. The relation of instantons to the acoustic coherent-potential approximation is demonstrated in the recovery of the uniform limit. C1 Univ Texas, Appl Res Labs, Austin, TX 78713 USA. Univ Calif Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA. RP Smith, E (reprint author), Univ Texas, Appl Res Labs, Austin, TX 78713 USA. NR 18 TC 4 Z9 4 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 9 BP 5346 EP 5366 DI 10.1103/PhysRevB.58.5346 PG 21 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100042 ER PT J AU Vogelgesang, R Alvarenga, AD Kim, H Ramdas, AK Rodriguez, S Grimsditch, M Anthony, TR AF Vogelgesang, R Alvarenga, AD Kim, H Ramdas, AK Rodriguez, S Grimsditch, M Anthony, TR TI Multiphonon Raman and infrared spectra of isotopically controlled diamond SO PHYSICAL REVIEW B LA English DT Article ID LATTICE-DYNAMICS; SCATTERING; SEMICONDUCTORS; CRYSTALS; SILICON; SI; GE AB Two-phonon spectra of (C1-xCx)-C-12-C-13 diamonds, 0 less than or equal to x less than or equal to 1, are measured with a sensitive charge-coupled device-based Raman and a Fourier transform infrared spectrometer. Exploiting the infrared activity and the polarization characteristics of the Raman spectra recorded for a variety of scattering geometrics, the two-phonon features are interpreted in terms of the critical points revealed in the phonon dispersion curves determined by inelastic neutron scattering. The occurrence of identical spectroscopic features in both C-13 and natural diamond, consistent with virtual crystal approximation, proved invaluable in arriving at assignments for them. Space group selection rules for two-phonon combinations/overtones and the wave-vector conservation, all employed in a self-consistent fashion, yield the frequencies of the critical points with improved precision. C1 Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. Argonne Natl Lab, Argonne, IL 60439 USA. GE, Corp Res & Dev, Schenectady, NY 12309 USA. RP Vogelgesang, R (reprint author), Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. RI Vogelgesang, Ralf/B-4460-2009; Alvarenga, Ana Paula/M-9790-2014 OI Vogelgesang, Ralf/0000-0002-1026-3205; NR 41 TC 31 Z9 31 U1 1 U2 6 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 SEP 1 PY 1998 VL 58 IS 9 BP 5408 EP 5416 DI 10.1103/PhysRevB.58.5408 PG 9 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100048 ER PT J AU Kivshar, YS Champneys, AR Cai, D Bishop, AR AF Kivshar, YS Champneys, AR Cai, D Bishop, AR TI Multiple states of intrinsic localized modes SO PHYSICAL REVIEW B LA English DT Article ID WEAKLY COUPLED OSCILLATORS; HAMILTONIAN NETWORKS; BREATHERS; CHAINS AB In the framework of the continuum approximation, localized modes in nonlinear lattices ("intrinsic localized modes'' or ''discrete breathers'') are described by the nonlinear Schrodinger, (NLS) equation. We go beyond this approximation and analyze what kind of qualitatively new effects can be introduced by discreteness. Taking into account the higher-order linear and nonlinear dispersion terms in the NLS equation derived from a lattice model, we predict the existence of bound states of intrinsic localized excitations. These bound: states of nonlinear localized modes are also found numerically for a discrete chain with linear and nonlinear cubic interparticle interaction. C1 Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia. Univ Bristol, Dept Engn Math, Bristol BS8 1TR, Avon, England. NYU, Courant Inst Math Sci, New York, NY 10012 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Kivshar, YS (reprint author), Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia. RI Champneys, Alan/A-2278-2013 NR 19 TC 24 Z9 24 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 9 BP 5423 EP 5428 DI 10.1103/PhysRevB.58.5423 PG 6 WC Physics, Condensed Matter SC Physics GA 116JA UT WOS:000075720100050 ER PT J AU Watson, RE Weinert, M AF Watson, RE Weinert, M TI Transition-metal aluminide formation: Ti, V, Fe, and Ni aluminides SO PHYSICAL REVIEW B LA English DT Article ID THERMODYNAMIC PROPERTIES; INTERMETALLIC COMPOUNDS; ELECTRONIC-STRUCTURE; PHASE-STABILITY; 1ST-PRINCIPLES; ENTHALPIES; DIAGRAM; SYSTEMS; ALLOYS AB The heats of formation for binary and ternary 3d transition-metal (Ti, V, Fe, and Ni) aluminides are calculated from first principles within the local density approximation. The calculated heats for Ti and Ni aluminides an typically within similar to 0.02 eV/atom of the experimental values, while the Fe aluminides heats appear to be overestimated by similar to 0.15 eV/atom. This discrepancy appears to be related to the local density underestimation of the on-site magnetic energy in elemental Fe that enters the alloy heat of formation. The stabilities of selected ternary phases are also discussed, and it is shown that sublattice disorder may stabilize some ternary phases. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Watson, RE (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 32 TC 80 Z9 83 U1 2 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP 5981 EP 5988 DI 10.1103/PhysRevB.58.5981 PG 8 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600022 ER PT J AU Karimi, M Yates, H Ray, JR Kaplan, T Mostoller, M AF Karimi, M Yates, H Ray, JR Kaplan, T Mostoller, M TI Elastic constants of silicon using Monte Carlo simulations SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; COMPUTER-SIMULATION; LATTICE-DYNAMICS; TEMPERATURE; POTENTIALS; ENSEMBLE AB Elastic constants of a bulk silicon crystal are calculated using the Monte Carlo (MC) technique in conjunction with an isoenthalpic-isotension-isobaric ensemble (HtN ensemble) and the Stillinger Weber (SW) potential or one of the Tersoff potentials. This MC method is the counterpart of the Parrinello-Rahman HtN molecular dynamics. We present HtN MC calculations of the adiabatic elastic constants of a crystalline silicon at three different temperatures, using an HtN ensemble fluctuation formula, and compare with the corresponding results from EhN ensemble molecular dynamics (MD) simulation. Calculation of the elastic constants of SW silicon using HtN MC simulation is a superior technique when compared to a corresponding HtN MD simulation that failed to produce accurate results. The calculation of the elastic constants using the HtN ensemble is, in general, slower in convergence than the corresponding calculation using the EhN ensemble. It is still a useful technique for the calculation of elastic constants, because it does not require any knowledge of the derivatives of the potential, which could be nontrivial for potentials with terms beyond two body. In order to investigate the convergence of another potential, elastic constants of the latest silicon Tersoff potential were calculated at a nonzero temperature. The zero-temperature elastic constants of Si SW and Si Tersoff potentials were also calculated using a direct method and extrapolation of HtN MC results to zero temperature. C1 Indiana Univ Penn, Dept Phys, Indiana, PA 15705 USA. Kinard Lab Phys, Dept Phys & Astron, Clemson, SC 29634 USA. Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. RP Karimi, M (reprint author), Indiana Univ Penn, Dept Phys, Indiana, PA 15705 USA. NR 22 TC 25 Z9 25 U1 2 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 SEP 1 PY 1998 VL 58 IS 10 BP 6019 EP 6025 DI 10.1103/PhysRevB.58.6019 PG 7 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600026 ER PT J AU Kress, JD Saxena, A Bishop, AR Martin, RL AF Kress, JD Saxena, A Bishop, AR Martin, RL TI Enhancement of optical nonlinearity due to breathers in finite polyenes SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; POLYACETYLENE; PARAMETERS; MOLECULES AB We systematically investigate the effect of strongly nonlinear breather (multiphonon bound) states on static polarizability (alpha) and hyperpolarizability (gamma) of finite polyenes (C24H26, C40H42) within the time-dependent Hartree-Fock approximation. Electronic structure, molecular-dynamics, and geometry optimization calculations are performed using the PM3 parametrization of the modified neglect of differential overlap Hamiltonian as implemented in the MOPAC 93 program. AII degrees of freedom are allowed to evolve, including those coupling to the C-C bond distances. Breathers are obtained as coherent nonlinear excitations from appropriate initial conditions, and a strong increase in alpha and a very significant enhancement in gamma in the presence of breathers is found. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Kress, JD (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM jdk@lanl.gov; avadh@lanl.gov; arb@idun.lanl.gov; rlm@t12.lanl.gov NR 16 TC 12 Z9 12 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP 6161 EP 6165 DI 10.1103/PhysRevB.58.6161 PG 5 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600041 ER PT J AU Cheon, KO Fisher, IR Kogan, VG Canfield, PC Miranovic, P Gammel, PL AF Cheon, KO Fisher, IR Kogan, VG Canfield, PC Miranovic, P Gammel, PL TI Resistivity and magnetic susceptibility of single-crystal Lu(Ni1-xCox)(2)B2C (x=0.0-0.09) SO PHYSICAL REVIEW B LA English DT Article ID FLUX-LINE-LATTICE; LUNI2B2C; SUPERCONDUCTIVITY; FIELD; ERNI2B2C; YNI2B2C; SYSTEM; HEAT; ER; HO AB Single crystal samples of Lu(Ni1-xCox)(2)B2C have been prepared for x=0-0.09. In-plane electrical resistivity measurements show that the residual resistivity of these samples increases linearly with x, though by less than is observed for polycrystalline samples. T-c is suppressed by the cobalt substitution (from 16.0 K for x = 0 to 9.5 K for x = 0.09), though magnetization measurements indicate that this is not due to pair breaking by magnetic impurities. The critical field H-C2(T) decreases with increasing Co concentration, and has some anisotropy between H parallel to c and H perpendicular to c. The ratio of the coherence length to the mean-free path (xi(0)/l) is estimated, and found to be approaching the dirty limit (xi(0)/l much greater than 1) as x increases. These results are discussed with reference to nonlocal effects and the vortex lattice structure of the borocarbides in the mixed state. C1 Iowa State Univ Sci & Technol, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA. Univ Tokyo, Nucl Engn Lab, Tokai, Ibaraki 31911, Japan. AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. RP Cheon, KO (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA. RI Canfield, Paul/H-2698-2014 NR 18 TC 51 Z9 51 U1 1 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 SEP 1 PY 1998 VL 58 IS 10 BP 6463 EP 6467 DI 10.1103/PhysRevB.58.6463 PG 5 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600074 ER PT J AU Jisrawi, NM Ruckman, MW Thurston, TR Reisfeld, G Weinert, M Strongin, M Gurvitch, M AF Jisrawi, NM Ruckman, MW Thurston, TR Reisfeld, G Weinert, M Strongin, M Gurvitch, M TI Reversible depression in the T-c of thin Nb films due to enhanced hydrogen adsorption SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTIVITY; NIOBIUM; DESTRUCTION; DISORDER; OXYGEN AB The effect of large hydrogen concentrations (approximate to 30% atomic), on the superconducting transition temperature T-c of Nb films is discussed. The hydrogen is incorporated in solutionlike phases which occur at these concentrations because the (alpha to beta) hydride transition in these films is suppressed. X-ray-diffraction data show an asymmetric expansion of the [110] Nb interplanar spacing. This can be as high as a 6-8 % expansion perpendicular to the plane of the film for the addition of similar to 70% hydrogen, with only a 1-2 % change in the plane of the film. T-c is depressed to a value near 50% of that of the undoped film with about 30% atomic hydrogen, and returns to its initial value when the hydrogen is removed. A discussion is given of how both disorder and changes in the electronic structure can affect T-c. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. RP Jisrawi, NM (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 26 TC 10 Z9 10 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP 6585 EP 6590 DI 10.1103/PhysRevB.58.6585 PG 6 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600084 ER PT J AU Anders, S Parthasarathy, R Jaeger, HM Guptasarma, P Hinks, DG van Veen, R AF Anders, S Parthasarathy, R Jaeger, HM Guptasarma, P Hinks, DG van Veen, R TI Dynamics of the second peak in the magnetization of Bi2Sr2CaCu2O8 crystals SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; CA-CU-O; SINGLE-CRYSTALS; DIMENSIONAL CROSSOVER; COLUMNAR DEFECTS; BSCCO CRYSTALS; 2ND PEAK; RELAXATION; ANISOTROPY AB We use a combination of relaxation measurements and magnetic hysteresis loops at different field ramp rates to explore the dynamical behavior of the second peak in the magnetization of Bi2Sr2CaCu2O8 crystals. We find that the second peak is absent in the short-time limit. It evolves at intermediate time scales due to a different decay rate of the Bean profile at fields above and below the second peak. At long time scales, when the Bean profile for fields below the second peak has decayed, the size of the second peak saturates. Finally, while the Bean profile above the second peak field slowly decays, the second peak decreases and vanishes. C1 Univ Chicago, James Franck Inst, Chicago, IL 60637 USA. Univ Chicago, Dept Phys, Chicago, IL 60637 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Delft Inst Microelect & Submicron Technol, NL-2628 CJ Delft, Netherlands. RP Anders, S (reprint author), Univ Chicago, James Franck Inst, Chicago, IL 60637 USA. RI Parthasarathy, Raghuveer/A-5958-2008 OI Parthasarathy, Raghuveer/0000-0002-6006-4749 NR 34 TC 26 Z9 26 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP 6639 EP 6644 DI 10.1103/PhysRevB.58.6639 PG 6 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600090 ER PT J AU Fishman, RS Liu, SH AF Fishman, RS Liu, SH TI Spin-wave gap and spin dynamics of gamma-Mn alloys SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC EXCITATIONS; TEMPERATURE-DEPENDENCE; LATTICE DISTORTION; DENSITY WAVE; MANGANESE AB The magnetic phase diagram of gamma-Mn alloys contains both collinear and noncollinear magnetic phases in fct and fee crystal structures. Using a two-band model which incorporates the magnetoelastic coupling, we find that the gap Delta(sw)(T) in the spin-wave dispersion is proportional to the 3/2 power of the sublattice magnetization M(T), in agreement with experiments on both the collinear and noncollinear magnetic phases. For the noncollinear magnetic phases observed in MnNi and FeMn alloys, high-frequency excitations are predicted with omega((q) over right arrow=0)similar to Delta, where 2 Delta is the energy gap in the quasiparticle spectrum. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RP Fishman, RS (reprint author), Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RI Fishman, Randy/C-8639-2013 NR 21 TC 8 Z9 8 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP R5912 EP R5915 DI 10.1103/PhysRevB.58.R5912 PG 4 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600007 ER PT J AU Ozolins, V Wolverton, C Zunger, A AF Ozolins, V Wolverton, C Zunger, A TI First-principles theory of vibrational effects on the phase stability of Cu-Au compounds and alloys SO PHYSICAL REVIEW B LA English DT Article ID DISORDERED NI3AL; ENTROPY; AG; GA1-XINXP; DIAGRAM; METALS; NI AB The importance of vibrational effects on the phase stability of Cu-Au alloys is investigated via a combination of first-principles linear response calculations and a statistical mechanics cluster expansion method. We find that (i) the logarithmic average of the phonon density of states in ordered compounds is lower than in the pure constituents, thus leading to positive vibrational entropies of formation and to negative free energies of formation, stabilizing the compounds and alloys with respect to the phase separated state. (ii) The vibrational free energy is lower in the configurationally random alloy than in ordered ground states, which leads to lower order-disorder transition temperatures. (iii) The random alloys have larger thermal expansion coefficients than ordered ground states, and therefore the vibrational entropy difference between the random and ordered states is a strongly increasing function of temperature. However, (iv) due to the associated increase in the static internal energy, the effect of thermal expansion on the free energy (and thus on the phase diagram) is only half that of the entropy alone. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ozolins, V (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Wolverton, Christopher/B-7542-2009; Ozolins, Vidvuds/D-4578-2009; Zunger, Alex/A-6733-2013 NR 24 TC 87 Z9 87 U1 2 U2 22 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 SEP 1 PY 1998 VL 58 IS 10 BP R5897 EP R5900 DI 10.1103/PhysRevB.58.R5897 PG 4 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600003 ER PT J AU Schmeltzer, D Bishop, AR AF Schmeltzer, D Bishop, AR TI Collapse of the spin gap with pressure in spin-ladder compounds SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC EXCITATIONS; S=1/2; SPECTRUM; TEMPERATURE; CROSSOVER; STATE AB We introduce a model of weakly coupled spin ladders using a decomposition into triplet and singlet Majorana fermions. We show that a weak coupling between the ladders causes the triplet gap to vanish. Assuming that pressure enhances the interladder coupling, we find that the triplet gap vanishes with increased pressure. We suggest that this is the explanation of recent nuclear magnetic resonance experimental data in superconducting spin-ladder compounds such as Sr2Ca12Cu24O41. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. CUNY City Coll, Dept Phys, New York, NY 10031 USA. RP Schmeltzer, D (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 20 TC 2 Z9 2 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1998 VL 58 IS 10 BP R5905 EP R5907 DI 10.1103/PhysRevB.58.R5905 PG 3 WC Physics, Condensed Matter SC Physics GA 121HN UT WOS:000076007600005 ER PT J AU Kharraja, B Garg, U Jin, H Ernst, RJ Ghugre, SS Janssens, RVF Carpenter, MP Fischer, SM Khoo, TL Lauritsen, T Nisius, D Moore, EF Byrski, T Krucken, R Macchiavelli, AO MacLeod, R Kaczarowski, R Govil, IM AF Kharraja, B Garg, U Jin, H Ernst, RJ Ghugre, SS Janssens, RVF Carpenter, MP Fischer, SM Khoo, TL Lauritsen, T Nisius, D Moore, EF Byrski, T Krucken, R Macchiavelli, AO MacLeod, R Kaczarowski, R Govil, IM TI Quadrupole moments and identical superdeformed bands in Tb-149 SO PHYSICAL REVIEW C LA English DT Article ID LIFETIME MEASUREMENTS; STATES; EXCITATIONS; NUCLEI; PROTON; DY-152 AB Five superdeformed (SD) bands have been observed in Tb-149, using the Gammasphere spectrometer. The measurement was performed with a backed target to obtain lifetime information from a Doppler-shift attenuation method analysis. It is proposed that the yrast SD band corresponds to the Gd-148(yrast)x pi 6(3) intruder configuration. The first excited band (band 2) is found to be identical to the Tb-150 yrast SD band. Band 3 is proposed to correspond to the pi[301]1/2(alpha = - 1/2)-->[651]3/2(alpha = -1/2) proton-hole excitation coupled to the pi 6(4)v7(1)(v[651]1/2)(-1) intruder configuration. Bands 4 and 5, the weakest SD bands seen in the present work, show similarities with band 3 and are most Likely associated with a similar intruder configuration. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. Univ Strasbourg 1, IN2P3, IRES, F-67037 Strasbourg, France. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Soltan Inst Nucl Studies, PL-05400 Swierk, Poland. Panjab Univ, Dept Phys, Chandigarh 160014, India. RP Kharraja, B (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RI Carpenter, Michael/E-4287-2015; Kruecken, Reiner/A-1640-2013 OI Carpenter, Michael/0000-0002-3237-5734; Kruecken, Reiner/0000-0002-2755-8042 NR 23 TC 7 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1422 EP 1429 DI 10.1103/PhysRevC.58.1422 PG 8 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700008 ER PT J AU Lalazissis, GA Raman, S AF Lalazissis, GA Raman, S TI Proton drip-line nuclei in relativistic mean-held theory SO PHYSICAL REVIEW C LA English DT Article ID GROUND-STATE PROPERTIES; FIELD DESCRIPTION; PARTICLE STABILITY; IDENTIFICATION; RADIOACTIVITY; ISOTOPES; SN-100; BEAMS AB The position of the two-proton drip line has been calculated for even-even nuclei with 10 less than or equal to Z less than or equal to 82 in the framework of the relativistic mean-field (RMF) theory. The current model uses the NL3 effective interaction in the mean-field Lagrangian and describes pairing correlations in the Bardeen-Cooper-Schrieffer (BCS) formalism. The predictions of the RMF theory are compared with those of the Hartree-Fock+BCS approach (with effective force Skyrme SIII) and the finite-range droplet model (FRDM) and with the available experimental information. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Lalazissis, GA (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 40 TC 25 Z9 27 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1467 EP 1472 DI 10.1103/PhysRevC.58.1467 PG 6 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700012 ER PT J AU Lee, TSH Ma, ZY Saghai, B Toki, H AF Lee, TSH Ma, ZY Saghai, B Toki, H TI Photoproduction of a Lambda on C-12 SO PHYSICAL REVIEW C LA English DT Article ID KAON PHOTOPRODUCTION; HYPERNUCLEI; NUCLEI; MODEL AB The photoproduction of a Lambda on C-12 is investigated by using the recently developed Saclay-Lyon amplitudes for the gamma p-->K(+)Lambda reaction and the single-particle wave functions from a relativistic mean-field model of nuclei and Lambda hypernuclei. With the nuclear transition matrix elements taken from a shell-model calculation, the predicted bound-h production cross sections are close to the C-12(gamma,K+)(Lambda)B-12 reaction data. The dependence of the predictions on the model of gamma p-->K(+)Lambda amplitudes has been investigated. The cross sections of quasifree processes leading to an unbound Lambda are also calculated in a simple three-body model. The predicted cross sections of the inclusive C-12(gamma,K+) reaction reproduce the energy dependence of the data up to 1.1 GeV, but overestimate the magnitude by a factor of about 2.2. We discuss the extent to which this overestimation can be understood in terms of medium effects on the propagation of the outgoing K+ and Lambda. C1 Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. China Inst Atom Energy, Beijing 102413, Peoples R China. CEA Saclay, Serv Phys Nucl, F-91191 Gif Sur Yvette, France. RP Lee, TSH (reprint author), Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan. NR 27 TC 8 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1551 EP 1557 DI 10.1103/PhysRevC.58.1551 PG 7 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700020 ER PT J AU Benck, S Slypen, I Meulders, JP Corcalciuc, V Chadwick, MB Young, PG Koning, AJ AF Benck, S Slypen, I Meulders, JP Corcalciuc, V Chadwick, MB Young, PG Koning, AJ TI Light charged particle production in neutron-induced reactions on aluminum at E-n = 62.7 MeV SO PHYSICAL REVIEW C LA English DT Article ID CONTINUUM ANGULAR-DISTRIBUTIONS; NUCLEAR-REACTIONS; ENERGY; PROTON; IDENTIFICATION; BOMBARDMENT; SYSTEMATICS; CARBON; MODEL; BEAM AB Double-differential cross sections for 62.7+/-1.0 MeV neutron-induced light charged particle (p, d, t, and alpha) production on aluminum are reported. Angular distributions were measured at laboratory angles between 20 degrees and 160 degrees in steps of 10 degrees. Procedures for data taking and data reduction are described. Results for double-differential, energy-differential, and total production cross sections are presented. The measurements are compared to existing proton-induced data and to nuclear model calculations which include preequilibrium and equilibrium decay mechanisms. Agreement with the model calculations is good for all ejectile types except for deuterons, where pickup processes are overestimated. The neutron-induced data presented are shown to be in good agreement with experimental proton-induced data for charge-symmetric reaction channels. For the proton emission channel the approximate factor of two between the two emission spectrum measurements is explained. C1 Univ Catholique Louvain, Inst Phys Nucl, B-1348 Louvain, Belgium. Inst Atom Phys, R-76900 Bucharest, Romania. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Netherlands Energy Res Fdn, ECN, BU Nucl Energy, NL-1755 ZG Petten, Netherlands. RP Benck, S (reprint author), Univ Catholique Louvain, Inst Phys Nucl, Chemin Cyclotron 2, B-1348 Louvain, Belgium. NR 28 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1558 EP 1568 DI 10.1103/PhysRevC.58.1558 PG 11 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700021 ER PT J AU Murgatroyd, JT Pople, JS Clarke, NM Fulton, BR Leddy, MJ Catford, WN Fox, SP Gyapong, GJ Jones, CD Watson, DL Rae, WDM Chan, Y Stokstad, RG Bennett, SJ AF Murgatroyd, JT Pople, JS Clarke, NM Fulton, BR Leddy, MJ Catford, WN Fox, SP Gyapong, GJ Jones, CD Watson, DL Rae, WDM Chan, Y Stokstad, RG Bennett, SJ TI O-16+Be-8 breakup of Mg-24 via the C-12(Ne-20, (OBe)-O-16-Be-8)Be-8 and C-12(Mg-24, (OBe)-O-16-Be-8)C-12 reactions SO PHYSICAL REVIEW C LA English DT Article ID HARTREE-FOCK CALCULATIONS; INELASTIC-SCATTERING; ANGULAR-CORRELATIONS; RESONANCES; FISSION; STATES; C-12; DECAY AB A study of the C-12(Ne-20, O-16 Be-8)Be-8 and C-12(Mg-24, O-16 Be-8)C-12 reactions has revealed O-16+Be-8 breakup occurring from specific states in the Mg-24 nucleus at high-excitation energies. A spin assignment has been determined for one of these states from an angular correlation measurement of the breakup fragments. In the 20Ne beam reaction, states have been identified at 22.33, 22.96, 24.00, 24.43, 24.88, 25.53, 27.35, 27.97, 28.88, and 30.13 MeV, and in the Mg-24 beam reaction states have been identified at 20.58, 21.54, 22.70, and 24.31 MeV. The results have been compared with previous measurements of the C-12+C-12 breakup channel. C1 Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England. Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. Univ York, Dept Phys, York YO1 5DD, N Yorkshire, England. Univ Oxford, Nucl Phys Lab, Oxford OX1 3RH, England. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA. RP Murgatroyd, JT (reprint author), Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England. NR 24 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 SEP PY 1998 VL 58 IS 3 BP 1569 EP 1575 DI 10.1103/PhysRevC.58.1569 PG 7 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700022 ER PT J AU Begemann-Blaich, M Lindenstruth, V Pochodzalla, J Adloff, JC Bouissou, P Hubele, J Imme, G Iori, I Kreutz, P Kunde, GJ Leray, S Liu, Z Lynen, U Meijer, RJ Milkau, U Moroni, A Muller, WFJ Ngo, C Ogilvie, CA Raciti, G Rudolf, G Sann, H Schnittker, M Schuttauf, A Seidel, W Stuttge, L Trautmann, W Tucholski, A AF Begemann-Blaich, M Lindenstruth, V Pochodzalla, J Adloff, JC Bouissou, P Hubele, J Imme, G Iori, I Kreutz, P Kunde, GJ Leray, S Liu, Z Lynen, U Meijer, RJ Milkau, U Moroni, A Muller, WFJ Ngo, C Ogilvie, CA Raciti, G Rudolf, G Sann, H Schnittker, M Schuttauf, A Seidel, W Stuttge, L Trautmann, W Tucholski, A TI Breakup conditions of projectile spectators from dynamical observables SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; INTERMEDIATE-MASS FRAGMENTS; GAS PHASE-TRANSITION; STATISTICAL MULTIFRAGMENTATION; NUCLEAR MULTIFRAGMENTATION; TIME-SCALE; AR-36+AU-197 COLLISIONS; HOT NUCLEI; EMISSION; DECAY AB Momenta and masses of heavy projectile fragments (Z greater than or equal to 8), produced in collisions of (197)AU With C, Al, Cu, and Pb targets at EIA = 600 MeV, were determined with the ALADIN magnetic spectrometer at SIS. Using this information, an analysis of kinematic correlations between the two and three heaviest projectile fragments in their rest frame was performed. The sensitivity of these correlations to the conditions at breakup was verified within the schematic sos model. For a quantitative investigation, the data were compared to calculations with statistical multifragmentation models and to classical three-body calculations. With classical trajectory calculations, where the charges and masses of the fragments are taken from a Monte Carlo sampling of the experimental events, the dynamical observables can be reproduced. The deduced breakup parameters, however, differ considerably from those assumed in the statistical multifragmentation models which describe the charge correlations. If, on the other hand, the analysis of kinematic and charge correlations is performed for events with two and three heavy fragments produced by statistical multifragmentation codes, good agreement with the data is found with the exception that the fluctuation widths of the intrinsic fragment energies are significantly underestimated. A new Version of the multifragmentation code MCFRAG was therefore used to investigate the potential role of angular momentum at the breakup stage. If a mean angular momentum of 0.75(h)over bar>/nucleon is added to the system, the energy fluctuations can be reproduced, but at the same time the charge partitions are modified and deviate from the data. C1 Gesell Schwerionenforsch mbH, D-64220 Darmstadt, Germany. MPI Kernphys Heidelberg, D-69029 Heidelberg, Germany. Ctr Rech Nucl, F-67037 Strasbourg, France. CENS, Natl Saturne Lab, F-91191 Gif Sur Yvette, France. Univ Catania, Dipartmento Fis, I-95129 Catania, Italy. Ist Nazl Fis Nucl, I-95129 Catania, Italy. Univ Milan, Ist Sci Fis, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Goethe Univ Frankfurt, Inst Kernphys, D-60486 Frankfurt, Germany. Forschungszentrum Rossendorf, D-01314 Dresden, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Yale Univ, Dept Phys, New Haven, CT 06512 USA. Inst High Energy Phys, Beijing 100039, Peoples R China. MIT, Dept Phys, Cambridge, MA 02139 USA. RP Gesell Schwerionenforsch mbH, D-64220 Darmstadt, Germany. OI Ogilvie, Craig/0000-0002-5188-5123 NR 57 TC 13 Z9 13 U1 1 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1639 EP 1655 DI 10.1103/PhysRevC.58.1639 PG 17 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700031 ER PT J AU Bearden, IG Boggild, H Boissevain, J Dodd, J Erazmus, B Esumi, S Fabjan, CW Ferenc, D Fields, DE Franz, A Gaardhoje, J Hamelin, M Hansen, AG Hansen, O Hardtke, D van Hecke, H Holzer, EB Humanic, TJ Hummel, P Jacak, BV Jayanti, R Kaimi, K Kaneta, M Kohama, T Kopytine, M Leltchouk, M Ljubicic, A Lorstad, B Maeda, N Malina, R Medvedev, A Murray, M Ohnishi, H Paic, G Pandey, SU Piuz, F Pluta, J Polychronakos, V Potekhin, M Poulard, G Reichhold, D Sakaguchi, A Simon-Gillo, J Schmidt-Sorensen, J Sondheim, W Spegel, M Sugitate, T Sullivan, JP Sumi, Y Willis, WJ Wolf, KL Xu, N Zachary, DS AF Bearden, IG Boggild, H Boissevain, J Dodd, J Erazmus, B Esumi, S Fabjan, CW Ferenc, D Fields, DE Franz, A Gaardhoje, J Hamelin, M Hansen, AG Hansen, O Hardtke, D van Hecke, H Holzer, EB Humanic, TJ Hummel, P Jacak, BV Jayanti, R Kaimi, K Kaneta, M Kohama, T Kopytine, M Leltchouk, M Ljubicic, A Lorstad, B Maeda, N Malina, R Medvedev, A Murray, M Ohnishi, H Paic, G Pandey, SU Piuz, F Pluta, J Polychronakos, V Potekhin, M Poulard, G Reichhold, D Sakaguchi, A Simon-Gillo, J Schmidt-Sorensen, J Sondheim, W Spegel, M Sugitate, T Sullivan, JP Sumi, Y Willis, WJ Wolf, KL Xu, N Zachary, DS TI High energy Pb+Pb collisions viewed by pion interferometry SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; BOSE-EINSTEIN CORRELATIONS; QUANTUM MOLECULAR-DYNAMICS; S+A COLLISIONS; CERN SPS; DEPENDENCE AB Two-pion correlations from Pb+Pb collisions at 158 GeV/c per nucleon are measured by the NA44 experiment at CERN. Multidimensional fits characterize the emission volume, which is found to be larger than in S-induced collisions. Comparison to the RQMD model is used to relate the fit parameters to the actual emission volume. C1 Niels Bohr Inst, DK-2100 Copenhagen, Denmark. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Columbia Univ, New York, NY 10027 USA. Nucl Phys Lab Nantes, F-44072 Nantes, France. Hiroshima Univ, Higashihiroshima 739, Japan. CERN, CH-1211 Geneva 23, Switzerland. Rudjer Boskovic Inst, Zagreb, Croatia. Ohio State Univ, Columbus, OH 43210 USA. Univ Lund, S-22362 Lund, Sweden. Texas A&M Univ, College Stn, TX 77843 USA. SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bearden, IG (reprint author), Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark. RI Bearden, Ian/M-4504-2014; OI Bearden, Ian/0000-0003-2784-3094; Gaardhoje, Jens-Jorgen/0000-0001-6122-4698 NR 21 TC 78 Z9 79 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1656 EP 1665 DI 10.1103/PhysRevC.58.1656 PG 10 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700032 ER PT J AU Poskanzer, AM Voloshin, SA AF Poskanzer, AM Voloshin, SA TI Methods for analyzing anisotropic flow in relativistic nuclear collisions SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; TRANSVERSE FLOW; COLLECTIVE FLOW; PHASE-TRANSITION; HADRONIC MATTER; EXPANSION; ENERGY; HYDRODYNAMICS; EMISSION; MOTION AB The strategy and techniques for analyzing anisotropic flow (directed, elliptic, etc.) in relativistic nuclear collisions are presented. The emphasis is on the use of the Fourier expansion of azimuthal distributions. We present formulas relevant for this approach, and in particular, show how the event multiplicity enters into the event plane resolution. We also discuss the role of nonflow correlations and a method for introducing flow into a simulation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Heidelberg, Inst Phys, D-6900 Heidelberg, Germany. RP Poskanzer, AM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Voloshin, Sergei/I-4122-2013 NR 43 TC 729 Z9 734 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 SEP PY 1998 VL 58 IS 3 BP 1671 EP 1678 DI 10.1103/PhysRevC.58.1671 PG 8 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700034 ER PT J AU Baltz, AJ McLerran, L AF Baltz, AJ McLerran, L TI Two center light cone calculation of pair production induced by ultrarelativistic heavy ions SO PHYSICAL REVIEW C LA English DT Article ID GLUON DISTRIBUTION-FUNCTIONS; LARGE NUCLEI AB An exact solution of the two center time-dependent Dirac equation for pair production induced by ultrarelativistic heavy ion collisions is presented. Cross sections to specific final states approach those of perturbation theory. Multiplicity rates are reduced from perturbation theory. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Minnesota, Sch Phys & Astron, Inst Theoret Phys, Minneapolis, MN 55455 USA. RP Baltz, AJ (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 10 TC 66 Z9 66 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 SEP PY 1998 VL 58 IS 3 BP 1679 EP 1688 DI 10.1103/PhysRevC.58.1679 PG 10 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700035 ER PT J AU Srivastava, DK Geiger, K AF Srivastava, DK Geiger, K TI Flash of photons from the early stage of heavy-ion collisions SO PHYSICAL REVIEW C LA English DT Article ID TRANSVERSE-MOMENTUM; NUCLEAR COLLISIONS AB The dynamics of partonic cascades may be an important aspect for particle production in relativistic collisions of nuclei at CERN SPS and BNL RHIC energies. Within the parton-cascade model, we estimate the production of single photons from such cascades due to the scattering of quarks and gluons qg-->q gamma, quark antiquark annihilation q (q) over bar-->g gamma or gamma gamma, and electromagnetic bremsstrahlung of quarks q-->q gamma. We find that the latter QED branching process plays the dominant role for photon production, similarly as the QCD branchings q-->qg and g-->gg play a crucial role for parton multiplication. We conclude therefore that photons accompanying the parton-cascade evolution during the early stage of heavy-ion collisions shed light on the formation of a partonic plasma. C1 Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Calcutta 700064, W Bengal, India. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Srivastava, DK (reprint author), Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, 1-AF Bidhan Nagar, Calcutta 700064, W Bengal, India. NR 22 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1734 EP 1737 DI 10.1103/PhysRevC.58.1734 PG 4 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700042 ER PT J AU Blaschke, D Holl, A Roberts, CD Schmidt, S AF Blaschke, D Holl, A Roberts, CD Schmidt, S TI Analysis of chiral and thermal susceptibilities SO PHYSICAL REVIEW C LA English DT Article ID GLUON PROPAGATOR; SYMMETRY BREAKING; MODEL; CONFINEMENT; PHYSICS; QCD AB We calculate the chiral and thermal susceptibilities for two confining Dyson-Schwinger equation models of QCD with two light flavors, a quantitative analysis of which yields the critical exponents beta and delta that characterize the second-order chiral symmetry restoration transition. The method itself is of interest, minimizing the influence of numerical noise in the calculation of the order parameter for chiral symmetry breaking near the critical temperature. For the more realistic of the two models we estimate T-C approximate to 153 MeV and the non-mean-field values beta = 0.46 +/- 0.04, delta = 4.3 +/- 0.3, and 1/(beta delta) = 0.54 +/- 0.05, which we discuss in comparison with the results of other models. C1 Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Blaschke, D (reprint author), Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany. OI Roberts, Craig/0000-0002-2937-1361 NR 19 TC 20 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP 1758 EP 1766 DI 10.1103/PhysRevC.58.1758 PG 9 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700046 ER PT J AU Gervais, G Thoennessen, M Ormand, WE AF Gervais, G Thoennessen, M Ormand, WE TI Temperature dependence of the giant dipole resonance in Sn-120 SO PHYSICAL REVIEW C LA English DT Article ID HIGH-EXCITATION ENERGIES; INELASTIC ALPHA-SCATTERING; HOT NUCLEI; EXCITED-STATES; WIDTH; PB-208; FLUCTUATIONS; SATURATION; MOTION AB Complete statistical model calculations including temperature- and spin-dependent theoretical strength functions of the giant dipole resonance (GDR) have been performed for the decay of excited Sn-120 for the first time. Previous analyses of GDR data with theoretical models compared the centroid and full width at half maximum of the theoretical strength functions with the extracted GDR parameters. In the new approach presented, the entire shape of the strength functions is considered and the theoretical spectra obtained can be directly compared with the experiment. This analysis does not rely on the accuracy of extracting the GDR parameters and/or the nuclear temperature of one data point. The nature of the temperature dependence of the GDR in the hot Sn-120 nucleus within the thermal fluctuation and collisional damping model is discussed in this new perspective. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Michigan State Univ, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. RP Gervais, G (reprint author), Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA. NR 27 TC 27 Z9 27 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD SEP PY 1998 VL 58 IS 3 BP R1377 EP R1381 DI 10.1103/PhysRevC.58.R1377 PG 5 WC Physics, Nuclear SC Physics GA 119LC UT WOS:000075896700003 ER PT J AU Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amos, N Anderson, EW Astur, R Baarmand, MM Babukhadia, L Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Barberis, E Bartlett, JF Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Coney, L Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, MK Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Geld, TL Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Glenn, S Gobbi, B Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY Joffe-Minor, T Johari, H Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmanov, D Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK Klima, B Klopfenstein, C Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kuleshov, S Kunori, S Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Manankov, V Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Monda, NK Montgomery, HE Mooney, P da Motta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Norman, D Oesch, L Oguri, V Oliveira, E Oltman, E Oshima, N Owen, D Padley, P Para, A Park, YM Partridge, R Parua, N Paterno, M Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sosebee, M Sotnikova, N Souza, M Spadafora, AL Steinbruck, G Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhou, Z Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alves, GA Amos, N Anderson, EW Astur, R Baarmand, MM Babukhadia, L Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Barberis, E Bartlett, JF Belyaev, A Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Coney, L Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahland, T Fatyga, MK Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Geld, TL Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Glenn, S Gobbi, B Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY Joffe-Minor, T Johari, H Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Karmanov, D Karmgard, D Kehoe, R Kelly, ML Kim, CL Kim, SK Klima, B Klopfenstein, C Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kuleshov, S Kunori, S Landry, F Landsberg, G Lauer, B Leflat, A Li, H Li, J Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Manankov, V Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miettinen, H Mincer, A Mishra, CS Mokhov, N Monda, NK Montgomery, HE Mooney, P da Motta, H Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Norman, D Oesch, L Oguri, V Oliveira, E Oltman, E Oshima, N Owen, D Padley, P Para, A Park, YM Partridge, R Parua, N Paterno, M Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sosebee, M Sotnikova, N Souza, M Spadafora, AL Steinbruck, G Stephens, RW Stevenson, ML Stewart, D Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhou, Z Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A TI Limits on WW gamma and WWZ couplings from W boson pair production SO PHYSICAL REVIEW D LA English DT Article ID ROOT-S=1.8 TEV; P(P)OVER-BAR COLLISIONS; E(+)E(-) INTERACTIONS; W+W PRODUCTION; SEARCH; SECTOR; ORDER; LEP AB The results of a search for W boson pair production in p (p) over bar collisions at root s = 1.8 TeV with subsequent decay to e mu, ee, and mu mu channels are presented. Five candidate events are observed with an expected background of 3.1+/-0.4 events for an integrated luminosity of approximately 97 pb(-1). Limits on the anomalous couplings are obtained from a maximum likelihood fit of the E-T spectra of the leptons in the candidate events. Assuming identical WW gamma and WWZ couplings, the 95% C.L. limits are -0.62bW(+)(b) over bar W- final states with one W boson decaying to q (q) over bar and the other to e nu or mu nu. Likelihood fits to the data yield m(t)(l + jets) = 173.3 +/- 5.6 (stat) +/- 5.5 (syst) GeV/c(2). When this result is combined with an analysis of events in which both W bosons decay into leptons, we obtain m(t) = 172.1 +/- 5.2 (stat) +/- 4.9 (syst) GeV/c(2) An alternate analysis, using three constraint fits to fixed top quark masses, gives m(t)(l + jets) = 176.0 +/- 7.9 (stat) +/- 4.8 (syst) GeV/c(2), consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. [S0556-2821(98)06815-5]. C1 NYU, New York, NY 10003 USA. Univ Los Andes, Bogota, Colombia. Univ Arizona, Tucson, AZ 85721 USA. Boston Univ, Boston, MA 02215 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Brown Univ, Providence, RI 02912 USA. Univ Buenos Aires, Buenos Aires, DF, Argentina. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. CINVESTAV, Mexico City 14000, DF, Mexico. Columbia Univ, New York, NY 10027 USA. Univ Delhi, Delhi 110007, India. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Univ Illinois, Chicago, IL 60607 USA. Indiana Univ, Bloomington, IN 47405 USA. Iowa State Univ, Ames, IA 50011 USA. Korea Univ, Seoul 136701, South Korea. Kyungsung Univ, Pusan 608736, South Korea. Inst Nucl Phys, Krakow, Poland. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Moscow State Univ, Moscow, Russia. Univ Nebraska, Lincoln, NE 68588 USA. Northeastern Univ, Boston, MA 02115 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Univ Oklahoma, Norman, OK 73019 USA. Panjab Univ, Chandigarh 160014, India. Protvino High Energy Phys Inst, Protvino 142284, Russia. Purdue Univ, W Lafayette, IN 47907 USA. Rice Univ, Houston, TX 77005 USA. Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil. Univ Rochester, Rochester, NY 14627 USA. CE Saclay, Serv Phys Particules, DAPNIA, CEA, Gif Sur Yvette, France. Seoul Natl Univ, Seoul, South Korea. SUNY Stony Brook, Stony Brook, NY 11794 USA. Tata Inst Fundamental Res, Colaba 400005, Mumbai, India. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. RP Abbott, B (reprint author), NYU, New York, NY 10003 USA. RI Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016; Kim, Sun Kee/G-2042-2015; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Belyaev, Alexander/F-6637-2015 OI Sznajder, Andre/0000-0001-6998-1108; Kim, Sun Kee/0000-0002-0013-0775; Aihara, Hiroaki/0000-0002-1907-5964; Dudko, Lev/0000-0002-4462-3192; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Belyaev, Alexander/0000-0002-1733-4408 NR 40 TC 124 Z9 123 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 052001 DI 10.1103/PhysRevD.58.052001 PG 39 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700005 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azzi-Bacchetta, P Bacchetta, N Bagdasarov, S Bailey, MW de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Brunetti, R Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chiou, CN Chlebana, F Christofek, L Chu, ML Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Costanzo, D Couyoumtzelis, C Cronin-Hennessy, D Culbertson, R Dagenhart, D Daniels, T DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Frisch, H Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gold, M Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L Grosso-Pilcher, C Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hauser, J Hayashi, E Heinrich, J Hao, W Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Huang, Z Huffman, BT Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Joshi, U Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kestenbaum, D Khazins, D Kikuchi, T Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kowald, W Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kurino, K Kuwabara, T Laasanen, AT Nakano, I Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mazzanti, P McIntyre, P Melese, P Menguzzato, M Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Miyashita, S Moggi, N Moore, E Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Nakada, H Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Peterson, JR Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pompos, A Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reischl, M Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Shah, T Shapiro, MD Shaw, NM Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Spalding, J Speer, T Sphicas, P Spinella, F Spiropalu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strohmer, R Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, J Suzuki, T Takahashi, T Takano, T Takashima, R Takikawa, K Tanaka, M Tannenbaum, B Tartarelli, F Taylor, W Tecchio, M Teng, PK Teramoto, Y Terashi, K Tether, S Theriot, D Thomas, TL Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Ukegawa, F Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Warburton, A Watanabe, T Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Zanetti, A Zetti, F Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azzi-Bacchetta, P Bacchetta, N Bagdasarov, S Bailey, MW de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Brunetti, R Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chiou, CN Chlebana, F Christofek, L Chu, ML Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Costanzo, D Couyoumtzelis, C Cronin-Hennessy, D Culbertson, R Dagenhart, D Daniels, T DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Frisch, H Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gold, M Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L Grosso-Pilcher, C Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hauser, J Hayashi, E Heinrich, J Hao, W Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Huang, Z Huffman, BT Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Joshi, U Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kestenbaum, D Khazins, D Kikuchi, T Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kowald, W Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kurino, K Kuwabara, T Laasanen, AT Nakano, I Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mazzanti, P McIntyre, P Melese, P Menguzzato, M Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Miyashita, S Moggi, N Moore, E Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Nakada, H Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Peterson, JR Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pompos, A Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reischl, M Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Shah, T Shapiro, MD Shaw, NM Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Spalding, J Speer, T Sphicas, P Spinella, F Spiropalu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strohmer, R Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, J Suzuki, T Takahashi, T Takano, T Takashima, R Takikawa, K Tanaka, M Tannenbaum, B Tartarelli, F Taylor, W Tecchio, M Teng, PK Teramoto, Y Terashi, K Tether, S Theriot, D Thomas, TL Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Ukegawa, F Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Warburton, A Watanabe, T Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Zanetti, A Zetti, F Zucchelli, S TI Search for long-lived parents of Z(0) bosons in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW D LA English DT Article ID DETECTOR AB We search for new long-lived particles which decay to Z(o) bosons by looking for Z(o)-->e(+)e(-) decays with displaced vertices. We find no evidence for parent particles of the Z(o) with long lifetimes in 90 pb(-1) of data from the CDF experiment at Fermilab. We set a cross section limit as a function of the lifetime of the parent particle for both a generic Z(o) parent and a fourth-generation, charge -1/3 quark that decays into Z(o)b. [S0556-2821(98)50217-2]. C1 Natl Lab High Energy Phys, KEK, Tsukuba 305, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Chicago, Chicago, IL 60637 USA. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 32611 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ New Mexico, Albuquerque, NM 87131 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Padua, Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Rockefeller Univ, New York, NY 10021 USA. Rutgers State Univ, Piscataway, NJ 08855 USA. Acad Sinica, Taipei 11530, Taiwan. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba 315, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Natl Lab High Energy Phys, KEK, Tsukuba 305, Japan. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Introzzi, Gianluca/K-2497-2015 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Introzzi, Gianluca/0000-0002-1314-2580 NR 8 TC 18 Z9 19 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 SEP 1 PY 1998 VL 58 IS 5 AR 051102 DI 10.1103/PhysRevD.58.051102 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700002 ER PT J AU Afanasev, A Carlson, CE Wahlquist, C AF Afanasev, A Carlson, CE Wahlquist, C TI Measuring polarized gluon and quark distributions with meson photoproduction SO PHYSICAL REVIEW D LA English DT Article ID TO-LEADING-ORDER; LARGE TRANSVERSE-MOMENTUM; DIRECT PHOTON PRODUCTION; SPIN STRUCTURE-FUNCTION; PION FORM-FACTOR; DEEP-INELASTIC SCATTERING; PARTON DISTRIBUTIONS; SEMIEXCLUSIVE PRODUCTION; PRECISION-MEASUREMENT; QCD AB We calculate polarization asymmetries in the photoproduction of high transverse momentum mesons, focusing on charged pions, considering the direct, fragmentation, and resolved photon processes. The results at very high meson momentum measure the polarized quark distributions and are sensitive to differences among the existing models. The results at moderate meson momentum are sensitive to the polarized gluon distribution and can provide a good way to measure it. Suitable data may come as a by-product of deep inelastic experiments to measure g(1) or from dedicated experiments. [S0556-2821(98)05015-2]. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Hampton Univ, Dept Phys, Hampton, VA 23668 USA. Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA. RP N Carolina Cent Univ, Dept Phys, Durham, NC 27707 USA. NR 51 TC 23 Z9 23 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 054007 DI 10.1103/PhysRevD.58.054007 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700025 ER PT J AU Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patton, S Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Ryd, A Balest, R Behrens, BH Ford, WT Gritsan, A Park, H Roy, J Smith, JG AF Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Galik, RS Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patton, S Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Ryd, A Balest, R Behrens, BH Ford, WT Gritsan, A Park, H Roy, J Smith, JG TI Hadronic transitions Y(2S)-> Y(1S) SO PHYSICAL REVIEW D LA English DT Article ID UPPER LIMIT; DECAY; SYSTEM; STATES AB Using a 73.6 pb(-1) data sample of Y(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Y(2S) and the T(1S). The dipion transition Y(2S)-->Y(1S) pi(+)pi(-) was studied using two different analysis techniques. Selecting events in which Y(1S)-->e(+)e(-), mu(+)mu(-) ("exclusive'' analysis), and using the Y(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Y(2S)-->Y(1S) pi(+)pi(-)) = 0.189 +/- 0.004 +/- 0.010, while using a method allowing T(1S)-->anything ("inclusive" analysis) we obtained B(Y(2S) -->Y(1S)pi(+)pi(-)) = 0.196 +/- 0.002 +/- 0.010. The appropriate weighted average of the two measurements gives a(T(2S) --> Y(1S) pi(+)pi(-)) = 0.192 +/- 0.002 +/- 0.010. Combining the exclusive and inclusive results we derive the T(1S) leptonic branching fractions B-ee = 0.0229 +/- 0.0008 +/- 0.0011 and B-mu mu = 0.0249 +/- 0.0008 +/- 0.0013. We also studied Y(2S)-->Y(1S) pi(o)pi(o) and obtained B(Y(2S)-->Y(1S) pi(o)pi(o))= 0.092 +/- 0.006 +/- 0.008. Parameters of the pi pi system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the eta and single pi(o) transitions and obtained the 90% confidence level upper limits B(Y(2S)-->(1S) eta)<0.0028 and B(Y(2S)-->(1S) pi(o))<0.0011. [S0556-2821(98)07417-7]. C1 Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Montreal, PQ, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Univ Texas, Austin, TX 78712 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. BINP, RU-630090 Novosibirsk, Russia. Yonsei Univ, Seoul 120749, South Korea. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Alexander, JP (reprint author), Cornell Univ, Ithaca, NY 14853 USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 29 TC 20 Z9 20 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 052004 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700008 ER PT J AU Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wolf, A Zoeller, MM Nemati, B Richichi, SJ Rose, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Kwon, Y Lyon, AL Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patron, S Prescott, C Yelton, J Zheng, J AF Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wolf, A Zoeller, MM Nemati, B Richichi, SJ Rose, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Kwon, Y Lyon, AL Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patron, S Prescott, C Yelton, J Zheng, J TI Continuum charged D* spin alignment at root s=10.5 GeV SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-QUARK FRAGMENTATION; HADRONIC Z(0) DECAYS; D-STAR PRODUCTION; E+E ANNIHILATION; MESONS; RESONANCE; MODEL AB A measurement of the spin alignment of charged D* mesons produced in continuum e(+)e(-)-->c (c) over bar events at root s = 10.5 GeV is presented. This study using 4.72 fb(-1) of CLEO II data shows that there is little evidence of any D* spin alignment. [S0556-2821(98)01317-4]. C1 Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Montreal, PQ, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. BINP, RU-630090 Novosibirsk, Russia. Yonsei Univ, Seoul 120749, South Korea. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Texas, Austin, TX 78712 USA. RP Brandenburg, G (reprint author), Harvard Univ, Cambridge, MA 02138 USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 32 TC 8 Z9 8 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 SEP 1 PY 1998 VL 58 IS 5 AR 052003 DI 10.1103/PhysRevD.58.052003 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700007 ER PT J AU Buck, WW Lebed, RF AF Buck, WW Lebed, RF TI New constraints on dispersive form factor parametrizations from the timelike region SO PHYSICAL REVIEW D LA English DT Article AB We generalize a recent model-independent form factor parametrization derived from rigorous dispersion relations to include constraints from data in the timelike region. These constraints dictate the convergence properties of the parametrization and appear as sum rules on the parameters. We further develop a new parametrization that takes into account finiteness and asymptotic conditions on the form factor, and use it to fit to the elastic pi electromagnetic form factor. We find that the existing world sample of timelike data gives only loose bounds on the form factor in the spacelike region, but we explain how the acquisition of additional timelike data and fits to other form factors are expected to give much better results. The same parametrization is seen to fit spacelike data extremely well. [S0556-2821(98)01217-X]. C1 Hampton Univ, Nucl High Energy Phys Res Ctr, Hampton, VA 23668 USA. Jefferson Lab, Newport News, VA 23606 USA. RP Buck, WW (reprint author), Hampton Univ, Nucl High Energy Phys Res Ctr, Hampton, VA 23668 USA. EM buck@jlab.org; lebed@jlab.org NR 27 TC 8 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 056001 DI 10.1103/PhysRevD.58.056001 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700052 ER PT J AU Burakovsky, L AF Burakovsky, L TI Scalar glueball mass in Regge phenomenology SO PHYSICAL REVIEW D LA English DT Article ID DIMENSIONS; SPECTRUM; PHYSICS AB We show that linear Regge trajectories for mesons and glueballs, and the cubic mass spectrum associated with them, determine a relation between the masses of the rho meson and the scalar glueball, M(0(++)) = 3/root 2M(rho), which implies M(0(++)) = 1620 +/- 10 MeV. We also discuss relations between the masses of the scalar and tensor and 3(--) glueballs, M(2(++)) = root 2M(0(++)), M(3(--)) = 2M(0(++)), which imply M(2(++)) = 2290 +/- 15 MeV, M(3(--)) = 3240 +/- 20 MeV. [S0556-2821(98)04317-3]. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Burakovsky, L (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, T-8, Los Alamos, NM 87545 USA. EM BURAKOV@QMC.LANL.GOV NR 37 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 057503 DI 10.1103/PhysRevD.58.057503 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700058 ER PT J AU Grossman, Y Isidori, G Worah, MP AF Grossman, Y Isidori, G Worah, MP TI CP asymmetry in B-d ->phi K-s: Standard model pollution SO PHYSICAL REVIEW D LA English DT Article ID KOBAYASHI-MASKAWA MATRIX; B-DECAY; PHYSICS; SUPERSYMMETRY; VIOLATION AB The difference in the time dependent CP asymmetries between the modes B-->psi K-S and B-->phi K-S is a clean signal for physics beyond the standard model. This interpretation could fail if there is a large enhancement of the matrix element of the b-->u (u) over bar s operator between the B-d initial stateand the phi K-S final state. We argue against this possibility and propose some experimental tests that could shed light on the situation. [S0556-2821(98)04817-6]. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Washington, Dept Phys, Seattle, WA 98185 USA. RP Grossman, Y (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 25 TC 76 Z9 76 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 057504 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700059 ER PT J AU Hewett, JL Rizzo, TG AF Hewett, JL Rizzo, TG TI Don't stop thinking about leptoquarks: Constructing new models SO PHYSICAL REVIEW D LA English DT Article ID PRECISION ELECTROWEAK EXPERIMENTS; HERA LARGE-Q(2) DATA; PARTON DISTRIBUTIONS; P(P)OVER-BAR COLLISIONS; FERMILAB TEVATRON; PARITY VIOLATION; HIGH-Q(2) EVENTS; BOSON PRODUCTION; PAIR PRODUCTION; HEAVY PHYSICS AB We discuss the general framework for the construction of new models containing a single fermion number zero scalar leptoquark of mass similar or equal to 200-220 GeV which can both satisfy the D0 and CDF search constraints as well as low-energy data, and can lead to both neutral and charged currentlike final states at DESY HERA. The class of models of this kind necessarily contain new vectorlike fermions with masses at the TeV scale which mix with those of the standard model after symmetry breaking. In this paper we classify all models of this type and examine their phenomenological implications as well as their potential embedding into supersymmetric (SUSY) and non-SUSY grand unified theory scenarios. The general coupling parameter space allowed by low-energy as well as collider data for these models is described and requires no fine-tuning of the parameters. [S0556-2821(98)03515-2] C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Hewett, JL (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 96 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 055005 DI 10.1103/PhysRevD.58.055005 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700045 ER PT J AU Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Mukhin, Y Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Barish, B Chadha, T Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Sharma, V Gronberg, J Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yang, S Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M O'Neill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Fulton, R Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH AF Jessop, CP Lingel, K Marsiske, H Perl, ML Schaffner, SF Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Mukhin, Y Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Freyberger, A Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Barish, B Chadha, T Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Brower, WS Masek, G Paar, HP Sharma, V Gronberg, J Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Cho, K Ford, WT Park, H Rankin, P Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Katayama, N Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yang, S Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M O'Neill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Fulton, R Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Wood, M Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Johnson, SD Kwon, Y Roberts, S Thorndike, EH TI Measurement of the branching ratios for the decays of Ds(+) to eta pi(+), eta 'pi(+), eta rho(+), and eta 'rho(+) SO PHYSICAL REVIEW D LA English DT Article ID D-MESONS; ETA AB Using a data sample with an integrated luminosity of 3.9 fb(-1) collected in e(+)e(-) annihilation with the CLEO-II detector at the Cornell Electron Storage Ring, we have measured the branching ratios for the decay modes D-s(+)-->(eta, eta')pi(+) and D-s(+)-->(eta, eta')rho(+) relative to D-s(+)--> phi pi(+). These decay modes are among the most common hadronic decays of the D-s(+), and can be related by factorization to the semileptonic decays D-s(+) --> (eta, eta') l(+)nu(l). The results obtained are compared with previous CLEO results and with the branching ratios measured for the related semileptonic decays. We also report results on the Cabibbo-suppressed decays of the D+ to the same final states. [S0556-2821(98)00417-2]. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Montreal, PQ, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Univ Texas, Austin, TX 78712 USA. BINP, RU-630090 Novosibirsk, Russia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Jessop, CP (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RI Schaffner, Stephen/D-1189-2011; Briere, Roy/N-7819-2014; Frasconi, Franco/K-1068-2016 OI Briere, Roy/0000-0001-5229-1039; Frasconi, Franco/0000-0003-4204-6587 NR 11 TC 15 Z9 15 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 052002 DI 10.1103/PhysRevD.58.052002 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700006 ER PT J AU Kogut, JB Lagae, JF Sinclair, DK AF Kogut, JB Lagae, JF Sinclair, DK TI Topology, fermionic zero modes, and flavor singlet correlators in finite temperature QCD SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL PHASE-TRANSITION; SCHWINGER MODEL; LATTICE QCD; 2 FLAVORS; THERMODYNAMICS; CHROMODYNAMICS; SYMMETRY; EQUATION; QUARKS; STATE AB We compute the screening correlators in the sigma and eta' flavor singlet channels in finite temperature QCD with 2 light quark flavors. Together with the correlators in the <(pi)over right arrow> and <(delta)over right arrow> channels, these are used to discuss several issues related to symmetry restoration and the nature of the QCD phase transition. Our calculations span a range of temperature extending from approximately 125 MeV to 170 MeV and are carried out in the context of a staggered fermion formulation on a 16(3) x 8 lattice. In addition to the computation at a fixed quark mass (am(q) = 0.00625), we discuss the issue of the chiral limit. After careful consideration of the zero-mode shift lattice artifact, we present rather strong (topological) arguments in favor of the non-restoration of U-A(1) at T-c. [S0556-2821(98)03517-6] C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA. RP Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA. NR 47 TC 47 Z9 47 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 054504 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700038 ER PT J AU Kronfeld, AS AF Kronfeld, AS TI Perturbative pole mass in QCD SO PHYSICAL REVIEW D LA English DT Article AB It is widely believed that the pole mass of a quark is infrared finite and gauge independent to all orders in perturbation theory. This seems not to have been proved in the literature. A proof is provided here. [S0556-2821(98)50515-2]. C1 Fermi Natl Accelerator Lab, Theoret Phys Grp, Batavia, IL 60510 USA. RP Kronfeld, AS (reprint author), Fermi Natl Accelerator Lab, Theoret Phys Grp, POB 500, Batavia, IL 60510 USA. OI Kronfeld, Andreas/0000-0003-2716-1149 NR 21 TC 70 Z9 70 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 051501 DI 10.1103/PhysRevD.58.051501 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700003 ER PT J AU Mahlon, G Parke, S AF Mahlon, G Parke, S TI Deconstructing angular correlations in ZH, ZZ, and WW production at CERN LEP 2 SO PHYSICAL REVIEW D LA English DT Article ID BOSON PAIR PRODUCTION; HIGGS-BOSON; COLLIDERS; COUPLINGS; AMPLITUDES; E+E-->W+W; DECAY; MASS AB We apply a generalized spin-basis analysis to associated Higgs boson production and gauge boson pair production at CERN LEP. This framework allows us to identify a choice of spin axes for the processes e(+)e(-)-->ZH, ZZ which leads to strikingly different correlations among the decay products, even well above threshold. This spin basis optimizes the difference in the angular correlations for these two processes. In contrast, the same distributions display little contrast when the helicity basis is used. We also apply this technique to the case of W boson pair production. [S0556-2821(98)04717-1] C1 McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada. Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP McGill Univ, Dept Phys, 3600 Univ St, Montreal, PQ H3A 2T8, Canada. EM mahlon@hep.physics.mcgill.ca; parke@fnal.gov NR 21 TC 11 Z9 11 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD SEP 1 PY 1998 VL 58 IS 5 AR 054015 DI 10.1103/PhysRevD.58.054015 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700033 ER PT J AU Rizzo, TG AF Rizzo, TG TI Right-handed currents in B decay reexamined SO PHYSICAL REVIEW D LA English DT Review ID SEMILEPTONIC BRANCHING RATIO; WEAK CHARGED CURRENT; FORM-FACTORS; QCD CORRECTIONS; MESON DECAYS; HEAVY QUARKS; P(P)OVER-BAR COLLISIONS; RADIATIVE-CORRECTIONS; SYMMETRICAL MODEL; LAMBDA(B) DECAYS AB We critically re-examine the case for and against a sizeable right-handed component in the b-->c charged current coupling with a strength xi relative to the conventional left-handed current. Using data from CLEO on the decay B-->D*l nu, as well as our knowledge of V-cb extracted from both inclusive and exclusive processes, we are able to determine the presently allowed parameter space for xi via HQET. We then identify several observables which could be measured at B factories to either strengthen these constraints or otherwise observe right-handed currents. This parameter space region is found to be consistent with the low degree of Lambda(b) polarization as determined by ALEPH as well as the measurements of the charged lepton and neutrino energy spectra from b decay made by L3. We discuss how future measurements of semileptonic decay distributions may distinguish between exotic Lambda(b) depolarization mechanisms and the existence of right-handed currents. Within the parameter space allowed by CLEO, using the left-right symmetric model as a guide, we perform a detailed search for specific sub-regions which can lead to a reduction in both the B semileptonic branching fraction as well as the the average yield of charmed quarks in B decay. The results provide a concrete realization of an earlier suggestion by Voloshin, but may lead to potential difficulties with certain penguin mediated decay processes. [S0556-2821(98)00119-2]. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Rizzo, TG (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 107 TC 12 Z9 12 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 SEP 1 PY 1998 VL 58 IS 5 AR 055009 DI 10.1103/PhysRevD.58.055009 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 116WU UT WOS:000075748700049 ER PT J AU Smith, E AF Smith, E TI Carnot's theorem as Noether's theorem for thermoacoustic engines SO PHYSICAL REVIEW E LA English DT Article ID PRIME MOVER AB Onset in thermoacoustic engines, the transition to spontaneous self-generation of oscillations, is studied here as both a dynamical critical transition and a limiting heat engine behavior. The critical transition is interesting because it occurs for both dissipative and conservative systems, with common scaling properties. When conservative, the stable oscillations above the critical point also implement a reversible engine cycle satisfying Carnot's theorem, a universal conservation law for entropy flux. While criticality in equilibrium systems is naturally associated with symmetries and universal conservation laws, these are usually exploited with global minimization principles, which dynamical critical systems may not have if dissipation is essential to their criticality. Acoustic heat engines furnish an example connecting equilibrium methods with dynamical and possibly even dissipative critical transitions: A reversible engine is shown to map, by a change of variables, to an equivalent system in apparent thermal equilibrium; a Noether symmetry in the equilibrium field theory implies Carnot's theorem for the engine. Under the same association, onset is shown to be a process of spontaneous symmetry breaking and the scaling of the quality factor predicted for both the reversible and irreversible engines is shown to arise from the Ginzburg-Landau description of the broken phase. C1 Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA. Univ Texas, Appl Res Labs, Austin, TX 78713 USA. RP Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA. NR 26 TC 9 Z9 9 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1998 VL 58 IS 3 BP 2818 EP 2832 DI 10.1103/PhysRevE.58.2818 PN A PG 15 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 121JV UT WOS:000076011200028 ER PT J AU Chitanvis, SM AF Chitanvis, SM TI Onset of polymer entanglement SO PHYSICAL REVIEW E LA English DT Article ID MODEL AB We have developed a theory of polymer entanglement using an extended Cahn-Hilliard functional with two extra terms. One is a nonlocal attractive term, operating over mesoscales, which is interpreted as giving rise to entanglement, and the other is a local repulsive term indicative of excluded volume interactions. This functional can be derived using notions from gauge theory. We go beyond the Gaussian approximation, to the one-loop level, to show that the system exhibits a crossover to a state of entanglement as the average chain length between points of entanglement decreases. This crossover is marked by critical slowing down, as the effective diffusion constant goes to zero. We have also computed the tensile modulus of the system, and we find a corresponding crossover to a regime of high modulus. The single parameter in our theory is obtained by fitting to available experimental data on polystyrene melts of various chain lengths. Extrapolation of this fit yields a model for the crossover to entanglement. The need for additional experiments detailing the crossover to the entangled state is pointed out. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Chitanvis, SM (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 29 TC 6 Z9 8 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1998 VL 58 IS 3 BP 3469 EP 3477 DI 10.1103/PhysRevE.58.3469 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 121HM UT WOS:000076007400030 ER PT J AU Perry, TS Klein, RI Bach, DR Budil, KS Cauble, R Kornblum, HN Wallace, RJ Lee, RW AF Perry, TS Klein, RI Bach, DR Budil, KS Cauble, R Kornblum, HN Wallace, RJ Lee, RW TI Measurement of the expansion of an aluminum plasma heated by M-band x rays SO PHYSICAL REVIEW E LA English DT Article ID INTERPENETRATION AB Gold M-band x rays produced by irradiating a gold sample with laser light from the Nova laser were used to heat an aluminum foil volumetrically. The hydrodynamic expansion and temperature of the resulting aluminum plasma were measured. The M-band source was characterized spatially and temporally, and provided a nearly uniform hulk heating of the sample. This provided an experimental test of hydrodynamic simulations free from the complications of laser-plasma interactions, multiple shocks, or strength of materials. Experiments and simulations of a simple planar expansion and the collision of two parallel foils are presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Perry, TS (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. RI Perry, Theodore/K-3333-2014 OI Perry, Theodore/0000-0002-8832-2033 NR 10 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1998 VL 58 IS 3 BP 3739 EP 3743 DI 10.1103/PhysRevE.58.3739 PN B PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 121HM UT WOS:000076007400060 ER PT J AU Okamoto, H Wei, J AF Okamoto, H Wei, J TI Theory of tapered cooling SO PHYSICAL REVIEW E LA English DT Article ID STORED ION-BEAM; STORAGE RING; LASER; CAVITY AB A theory of tapered cooling for fast circulating ion beams in a storage ring is constructed. We describe the fundamentals of this cooling scheme, a scheme that effectively yields both transverse and longitudinal cooling through radial-position-dependent longitudinal momentum cooling, emphasizing that it might be the most promising way to beam crystallization. The cooling rates are analytically evaluated to study the ideal operating condition. We discuss the physical implication of the tapering factor of the cooling force, and show how to determine its optimum value. Molecular dynamics is employed to demonstrate the validity of the present theory. C1 Kyoto Univ, Inst Chem Res, Accelerator Lab, Uji 611, Japan. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Okamoto, H (reprint author), Kyoto Univ, Inst Chem Res, Accelerator Lab, Uji 611, Japan. NR 23 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1998 VL 58 IS 3 BP 3817 EP 3825 DI 10.1103/PhysRevE.58.3817 PN B PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 121HM UT WOS:000076007400067 ER PT J AU Castillo, VM Hoover, WG AF Castillo, VM Hoover, WG TI Heat flux at the transition from harmonic to chaotic flow in thermal convection SO PHYSICAL REVIEW E LA English DT Article ID ATTRACTORS AB Numerical simulations of the fully compressible Navier-Stokes equations are used to study the transition from simple-periodic "harmonic" thermal convection to chaotic thermal convection as the Rayleigh number Ra is increased. The simulations suggest that a sharp discontinuity in the relationship between the Nusselt number Nu (the ratio of the total heat flux to the Fourier heat flux) and the Rayleigh number is associated with this transition in flow morphology. This drop in the Nusselt number is also seen in the data reported in independent experiments involving the convection of two characteristically different fluids-liquid mercury [Phys. Rev. E 56, R1302 (1997)] (a nearly incompressible fluid with Prandtl number Pr=0.024) and gaseous helium [Phys. Rev. A 36, 5870 (1987)] (a compressible fluid with unit Pr). The harmonic flow generates a dual-maximum (quasiharmonic) temperature histogram, while the chaotic flow generates a single-maximum histogram at the center point in the simulated cell. This is consistent with the temperature distributions reported for the convecting mercury before and after the drop in Nu. Our simulations also suggest a hysteresis in the Nu-Ra curve linking the two distinctly different flow morphologies, heat fluxes, and temperature-fluctuation histograms at the same Rayleigh number. C1 Univ Calif Davis, Dept Appl Sci, Livermore, CA 94551 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Castillo, VM (reprint author), Univ Calif Davis, Dept Appl Sci, Livermore, CA 94551 USA. NR 10 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1998 VL 58 IS 3 BP 4016 EP 4018 DI 10.1103/PhysRevE.58.4016 PN B PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 121HM UT WOS:000076007400090 ER PT J AU Linton, J Navrotsky, A Fei, Y AF Linton, J Navrotsky, A Fei, Y TI The thermodynamics of ordered perovskites on the CaTiO3-FeTiO3 join SO PHYSICS AND CHEMISTRY OF MINERALS LA English DT Article ID HIGH-PRESSURE; HIGH-TEMPERATURE; CRYSTAL-STRUCTURE; PHASE; MANTLE; FETIO3; CAFETI2O6; STABILITY; CATIO3 AB The enthalpies of formation from ilmenite, FeTiO3, and perovskite, CaTiO3, of two intermediate ordered perovskite phases, CaFeTi2O6 and CaFe3Ti4O12, have been measured at 801 degrees C using oxide melt solution calorimetry. These data, in combination with experiments at high pressure and temperature, indicate that below 1518+/-50 degrees C CaFe3Ti4O12 is stable at lower pressures (similar to 7 GPa at 1200 degrees C) than CaFeTi2O6 (similar to 13 GPa at 1200 degrees C). This relationship should be reversed, and CaFeTi2O6 should become stable at lower pressures than CaFe3Ti4O12, at temperatures above 1518+/-50 degrees C. These intermediate phases are of petrological interest because they form as a reaction between two minerals, ilmenite and perovskite, which are commonly associated in kimberlites, and because their pressure-temperature range of formation overlaps that of origin of kimberlites. C1 Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA. Princeton Univ, Ctr High Pressure Res, Princeton, NJ 08544 USA. Univ Calif Davis, Thermochem Facil, Davis, CA 95616 USA. Univ Calif Davis, Ctr High Pressure Res, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA. Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. Carnegie Inst Washington, Ctr High Pressure Res, Washington, DC 20015 USA. RP Linton, J (reprint author), Argonne Natl Lab, Basic Energy Sci Synchrotron Radiat Ctr, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Fei, Yingwei/F-3709-2011 OI Fei, Yingwei/0000-0001-9955-5353 NR 28 TC 10 Z9 10 U1 0 U2 10 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0342-1791 J9 PHYS CHEM MINER JI Phys. Chem. Miner. PD SEP PY 1998 VL 25 IS 8 BP 591 EP 596 DI 10.1007/s002690050152 PG 6 WC Materials Science, Multidisciplinary; Mineralogy SC Materials Science; Mineralogy GA 128KH UT WOS:000076404500007 ER PT J AU Arunasalam, V AF Arunasalam, V TI Angular momentum in velocity-dependent potentials: Bloch versus Feynman SO PHYSICS ESSAYS LA English DT Article DE angular momentum; velocity-dependent potentials; Landau gyration states; g-value; gauge invariance; Aharonov-Bohm phase; magnetic flux; Feynman; Bloch ID MAGNETIC-FLUX; STATISTICS AB It is shown here for the first time that conflicting views exist in the literature on the basic definition of the orbital angular momentum in velocity-dependent potentials between two of the world's leading physicists: Nobel laureates Feynman and Bloch. It is found that the Bloch definition is correct and the Feynman definition is incorrect. Implications of this for other related problems are also discussed. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Arunasalam, V (reprint author), Princeton Univ, Plasma Phys Lab, James Forrestal Campus,POB 451, Princeton, NJ 08543 USA. NR 15 TC 1 Z9 1 U1 0 U2 2 PU PHYSICS ESSAYS PUBLICATION PI HULL PA C/O ALFT INC, 189 DEVEAULT ST, UNIT NO. 7, HULL, PQ J8Z1S7, CANADA SN 0836-1398 J9 PHYS ESSAYS JI Phys. Essays PD SEP PY 1998 VL 11 IS 3 BP 408 EP 412 PG 5 WC Physics, Multidisciplinary SC Physics GA 154TF UT WOS:000077904400012 ER PT J AU Smithies, DJ Milner, TE Tanenbaum, BS Goodman, DM Nelson, JS AF Smithies, DJ Milner, TE Tanenbaum, BS Goodman, DM Nelson, JS TI Accuracy of subsurface temperature distributions computed from pulsed photothermal radiometry SO PHYSICS IN MEDICINE AND BIOLOGY LA English DT Article ID CHROMOPHORES; COMPONENTS; REGRESSION AB Pulsed photothermal radiometry (PPTR) is a non-contact method for determining the temperature increase in subsurface chromophore layers immediately following pulsed laser irradiation. In this paper the inherent limitations of PPTR are identified. A time record of infrared emission from a test material due to laser heating of a subsurface chromophore layer is calculated and used as input data for a non-negatively constrained conjugate gradient algorithm. Position and magnitude of temperature increase in a model chromophore layer immediately following pulsed laser irradiation are computed. Differences between simulated and computed temperature increase are reported as a function of thickness, depth and signal-to-noise ratio (SNR). The average depth of the chromophore layer and integral of temperature increase in the test material are accurately predicted by the algorithm. When the thickness/depth ratio is less than 25%, the computed peak temperature increase is always significantly less than the true value. Moreover, the computed thickness of the chromophore layer is much larger than the true value. The accuracy of the computed subsurface temperature distribution is investigated with the singular value decomposition of the kernel matrix. The relatively small number of right singular vectors that may be used (8% of the rank of the kernel matrix) to represent the simulated temperature increase in the test material limits the accuracy of PPTR. We show that relative error between simulated and computed temperature increase is essentially constant for a particular thickness/depth ratio. C1 Univ Calif Irvine, Beckman Laser Inst & Med Clin, Irvine, CA 92612 USA. Harvey Mudd Coll, Claremont, CA 91711 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand. RP Nelson, JS (reprint author), Univ Calif Irvine, Beckman Laser Inst & Med Clin, Irvine, CA 92612 USA. FU NIAMS NIH HHS [1R01-AR42437-01A1, 1R29-AR41638-01A1] NR 20 TC 26 Z9 26 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0031-9155 J9 PHYS MED BIOL JI Phys. Med. Biol. PD SEP PY 1998 VL 43 IS 9 BP 2453 EP 2463 DI 10.1088/0031-9155/43/9/002 PG 11 WC Engineering, Biomedical; Radiology, Nuclear Medicine & Medical Imaging SC Engineering; Radiology, Nuclear Medicine & Medical Imaging GA 119PH UT WOS:000075904800002 PM 9755938 ER PT J AU Nelkin, M Chen, S AF Nelkin, M Chen, S TI The scaling of pressure in isotropic turbulence SO PHYSICS OF FLUIDS LA English DT Letter ID TRANSVERSE STRUCTURE FUNCTIONS AB We study the scaling behavior of the pressure structure function for isotropic turbulence. This function is given exactly by Hill and Wilczak [J. Fluid Mech. 296, 247 (1995)] in terms of the three independent fourth order velocity structure functions, L(r)=[Delta u(4)(r)], T(r)=[Delta v(4)(r)], and M(r) = [Delta u(2)(r)Delta u(2)(r)]. We show from direct numerical simulation (DNS) that the cancellation between the positive terms proportional to L(r) and T(r) and the negative terms proportional to M(r) is almost complete. This suggests that the pressure structure function is extremely sensitive to recently observed small differences in scaling among the three quantities L(r), T(r), and M(r). We illustrate this sensitivity by calculating the pressure structure function in the atmospheric boundary layer using the recent data of B. Dhruva, Y. Tsuji, and K. R. Sreenivasan [Phys. Rev. E 56, R4928 (1997)]. The cancellation among the three terms persists, and gives an effective scaling exponent for the pressure structure function,[(Delta p(r))(2)]proportional to r(1.17), which is smaller than the scaling exponent for any of the three velocity structure functions. (C) 1998 American Institute of Physics. C1 NYU, Dept Phys, New York, NY 10003 USA. CUNY City Coll, Levich Inst, New York, NY 10031 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Nelkin, M (reprint author), NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USA. RI Chen, Shiyi/A-3234-2010 NR 11 TC 16 Z9 16 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD SEP PY 1998 VL 10 IS 9 BP 2119 EP 2121 DI 10.1063/1.869731 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 114JA UT WOS:000075604300011 ER PT J AU Tur, AV Maurice, S Blanc, M Yanovsky, VV AF Tur, AV Maurice, S Blanc, M Yanovsky, VV TI Solutions of the plasma equilibrium within the magnetic field of a point dipole SO PHYSICS OF PLASMAS LA English DT Article ID PRESSURE; MAGNETOSPHERE AB For axial symmetry, in this study we report on analytical solutions of the magnetohydrodynamics (MHD) equilibrium of a plasma within the magnetic environment of a point dipole. Inside the plasma domain, the magnetic flux function is calculated for a given shape of the pressure profile. Another magnetic flux function is derived outside the plasma domain, where the pressure vanishes. Both functions and their normal derivatives are continuous through the boundary between the two domains; together they constitute the solution of our problem. A pressure profile that is a quadratic function of the magnetic flux function is used. It leads to an exact solution which is a simple function of the spherical coordinates. It is shown that, in this situation, the plasma energy is distributed over the entire plasma domain. This solution is well suited as a magnetospheric model. The magnetic flux function determined outside the plasma domain is expressed by a very general formula that is valid for wide classes of both the pressure profiles and the shape of a plasma exterior boundary. Far away from this boundary, as near the coordinate center, the magnetic field tends to be dipolar. (C) 1998 American Institute of Physics. [S1070-664X(98)02808-0]. C1 Observ Midi Pyrenees, Lab Astrophys Toulouse, F-31400 Toulouse, France. Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87545 USA. Kharkov Single Crystals Inst, Lab Turbulence Res, UA-310001 Kharkov, Ukraine. RP Observ Midi Pyrenees, Lab Astrophys Toulouse, 14 Av Ed Belin, F-31400 Toulouse, France. NR 28 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3101 EP 3115 DI 10.1063/1.873036 PG 15 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900004 ER PT J AU Murillo, MS AF Murillo, MS TI Static local field correction description of acoustic waves in strongly coupling dusty plasmas SO PHYSICS OF PLASMAS LA English DT Article ID MODES AB The kinetic equations for an interacting dust system with external time-dependent forces is considered from the Born-Bogolyubov-Green-Kirkwood-Yvon equations. A kinetic equation is obtained by writing the two-particle distribution function as a product of two one-particle distribution functions and the equilibrium radial distribution function. It is shown that a Vlasov-like equation is recovered with a collision term which is a functional of the pair correlation function. Wave behavior from the corresponding fluid equations is considered for a dusty plasma. The results are in qualitative agreement with previously obtained dispersion relations based on generalized hydrodynamics and the quasilocalized charge approximation. (C) 1998 American Institute of Physics. [S1070-664X(98)00809-X]. C1 Univ Calif Los Alamos Natl Lab, Appl Theoret Div, Los Alamos, NM 87545 USA. RP Murillo, MS (reprint author), Univ Calif Los Alamos Natl Lab, Appl Theoret Div, Los Alamos, NM 87545 USA. NR 23 TC 61 Z9 61 U1 1 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3116 EP 3121 DI 10.1063/1.873037 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900005 ER PT J AU Borovsky, JE Hansen, PJ AF Borovsky, JE Hansen, PJ TI The morphological evolution and internal convection of ExB-drifting plasma clouds: Theory, dielectric-in-cell simulations, and N-body dielectric simulations SO PHYSICS OF PLASMAS LA English DT Article ID REGULARIZED CONTOUR DYNAMICS; IONOSPHERIC BARIUM CLOUDS; NON-LINEAR EVOLUTION; MAGNETIC-FIELD; BACKGROUND IONOSPHERE; STRIATIONS; STABILITY; PROPAGATION; INSTABILITY; DEFORMATION AB The evolution of E x B-drifting plasma clouds is investigated with the aid of a computational technique denoted here as "dielectric-in-cell." Many of the familiar phenomena associated with clouds of collisionless plasma are seen and explained and less-well-known phenomena associated with convection patterns, with the stripping of cloud material, and with the evolution of plasma clouds composed of differing ion species are investigated. The effects of spatially uniform diffusion are studied with the dielectric-in-cell technique and with another computational technique denoted as "N-body dielectric;" the suppression of convection, the suppression of structure growth, the increase in material stripping, and the evolution of cloud anisotropy are examined. (C) 1998 American Institute of Physics. [S1070-664X(98)01708-X]. C1 Univ Calif Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87501 USA. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. RP Borovsky, JE (reprint author), Univ Calif Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87501 USA. NR 38 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3195 EP 3223 DI 10.1063/1.872988 PG 29 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900016 ER PT J AU Uzdensky, DA Kulsrud, RM AF Uzdensky, DA Kulsrud, RM TI On the viscous boundary layer near the center of the resistive reconnection region SO PHYSICS OF PLASMAS LA English DT Article AB This paper studies the behavior of the magnetic field near the center ai the reconnection layer in the framework of two-dimensional incompressible resistive magnetohydrodynamics with uniform resistivity in a steady state. Priest and Cowley [J. Plasma Phys. 14, 271 (1975)] have presented an argument showing that when the viscosity nu is zero,the magnetic separatrices do not cross at a finite angle but osculate at the X-point In the present paper it is shown that this conclusion is in fact not correct. First, some results of numerical simulations of the reconnection layer are presented. These results contradict the conclusions of Priest and Cowley. To explain this contradiction, an analytical theory for the neighborhood of the X-point is developed. When viscosity nu is small, a narrow boundary layer develops near the neutral point. Some of the higher derivatives of the stream function Phi become very large near the X-point, leading to a nonzero angle between the separatrices. As nu-->0, the boundary layer shrinks and nonanalytic logarithmic terms emerge in the expansion of Phi in the outer region. This makes the Taylor expansion of Priest and Cowley invalid in the case nu=0. The results of our boundary layer analysis are in good agreement with the numerical simulations. (C) 1998 American Institute of Physics. [S1070-664X(98)00109-8]. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Uzdensky, DA (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 10 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 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3249 EP 3256 DI 10.1063/1.872992 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900020 ER PT J AU Peterson, DL Bowers, RL McLenithan, KD Deeney, C Chandler, GA Spielman, RB Matzen, MK Roderick, NF AF Peterson, DL Bowers, RL McLenithan, KD Deeney, C Chandler, GA Spielman, RB Matzen, MK Roderick, NF TI Characterization of energy flow and instability development in two-dimensional simulations of hollow Z pinches SO PHYSICS OF PLASMAS LA English DT Article ID IMPLOSIONS; OUTPUT; POWER AB A two-dimensional (2-D) Eulerian Radiation-Magnetohydrodynamic (RMHD) code has been used to simulate imploding Z pinches for three experiments fielded on the Los Alamos Pegasus B capacitor bank [J. C. Cochrane et al., Dense Z-Pinches, Third International Conference, London, United Kingdom 1993 (American Institute of Physics, New York, 1994), p. 381] and the Sandia Saturn accelerator [R. B. Spielman et al., Dense Z-Pinches, Second International Conference, Laguna Beach, 1989 (American Institute of Physics, New York, 1989), p. 3] and Z accelerator [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)]. These simulations match the experimental results closely and illustrate how the code results may be used to track the flow of energy in the simulation and account for the amount of total radiated energy. The differences between the calculated radiated energy and power in 2-D simulations and those from zero-dimensional (0-D) and one-dimensional (1-D) Lagrangian simulations (which typically underpredict the total radiated energy and overpredict power) are due to the radially extended nature of the plasma shell, an effect which arises from the presence of magnetically driven Rayleigh-Taylor instabilities. The magnetic Rayleigh-Taylor instabilities differ substantially from hydrodynamically driven instabilities and typical measures of instability development such as e-folding times and mixing layer thickness are inapplicable or of limited value. A new measure of global instability development is introduced, tied to the imploding plasma mass, termed "fractional involved mass." Examples of this quantity are shown for the three experiments along with a discussion of the applicability of this measure. (C) 1998 American Institute of Physics. [S1070-664X(98)00209-2] C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ New Mexico, Albuquerque, NM 87131 USA. RP Peterson, DL (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 18 TC 100 Z9 102 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3302 EP 3310 DI 10.1063/1.873062 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900026 ER PT J AU Gorelenkov, NN Cheng, CZ Tang, WM AF Gorelenkov, NN Cheng, CZ Tang, WM TI HINST: A two-dimensional code for high-n toroidicity induced Alfven eigenmodes stability SO PHYSICS OF PLASMAS LA English DT Article ID AXISYMMETRIC TOROIDAL PLASMAS; DIII-D TOKAMAK; WAVES; INSTABILITIES; SIMULATION; PARTICLES AB A high-n stability code, HINST, has been developed to study the stability of TAE (toroidicity induced Alfven eigenmodes) in large tokamaks such as the International Thermonuclear Experimental Reactor (ITER) [D. E. Post, Plasma Physics and Controlled Nuclear Fusion Research (International Atomic Energy Agency, Vienna, 1991), Vol. 3, p. 239] where the spectrum of unstable TAE modes is shifted toward medium to high-n modes. The code solves the two-dimensional (2-D) eigenmode problem by expanding the eigenfunction in terms of basis functions. Based on the Fourier-ballooning formalism the eigenmode problem is reduced to a system of coupled one-dimensional equations, which is solved numerically by using the finite element method. The numerical method allows one to include nonperturbatively nonideal effects such as: finite ion Larmor radius, trapped electron collisional damping, etc. The 2-D numerical results of TAE and resonance TAE (RTAE) modes are compared with those from local ballooning calculations and the global magnetohydrodynamic nonvariational code NOVA [C. Z. Cheng and M. S. Chance, J. Comput. Phys. 71, 124 (1987)]. The results show that for ITER-like plasma parameters, TAE and RTAE modes can be driven unstable by alpha particles for n = 10-20. The growth rate for the most unstable mode is within the range gamma/omega(A)similar or equal to 0.3%-1.5%. The most unstable modes are localized near r/a similar or equal to 0.5 and have a broad radial mode envelope width. (C) 1998 American Institute of Physics. [S1070-664X(98)04409-7] C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. TRINITI, Troitsk 142092, Russia. RP Gorelenkov, NN (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI Cheng, Chio/K-1005-2014 NR 29 TC 23 Z9 23 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3389 EP 3397 DI 10.1063/1.873052 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900036 ER PT J AU Cohen, BI Lasinski, BF Langdon, AB Williams, EA Baldis, HA Labaune, C AF Cohen, BI Lasinski, BF Langdon, AB Williams, EA Baldis, HA Labaune, C TI Suppression of stimulated Brillouin scattering by seeded ion wave mode coupling SO PHYSICS OF PLASMAS LA English DT Article ID LASER-IRRADIATED PLASMAS; PARAMETRIC-INSTABILITIES; BEAMS; LIGHT AB Particle simulations and the analytical solution of coupled mode equations are used to demonstrate that the mode coupling of a primary ion acoustic wave produced by stimulated Brillouin backscatter with a secondary finite-amplitude ion wave propagating at a finite relative angle can reduce the amplitude of the primary ion wave and the backscatter. The simulations and analysis give results that are in qualitative agreement with experimental observations [Baldis et al., Phys. Rev. Lett. 77, 2957 (1996)] of the partial suppression of stimulated Brillouin backscattering (SBBS) when there are simultaneous, overlapping SBBS processes at a finite relative angle, which may influence SBBS reflectivities in other current and future laser-fusion experiments with multiple overlapping beams. (C) 1998 American Institute of Physics. [S1070-664X(98)00309-7] C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Ecole Polytech, CNRS, Lab Utilisat Lasers Intenses, F-91128 Palaiseau, France. RP Cohen, BI (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 20 TC 13 Z9 13 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3402 EP 3407 DI 10.1063/1.873054 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900038 ER PT J AU Cohen, BI Lasinski, BF Langdon, AB Williams, EA Wharton, KB Kirkwood, RK Estabrook, KG AF Cohen, BI Lasinski, BF Langdon, AB Williams, EA Wharton, KB Kirkwood, RK Estabrook, KG TI Resonant stimulated Brillouin interaction of opposed laser beams in a drifting plasma SO PHYSICS OF PLASMAS LA English DT Article ID ION WAVES; ELECTROMAGNETIC-WAVES; ENERGY-TRANSFER; SCATTERING; LIGHT AB Particle simulations and solutions of coupled mode equations are used to analyze the energy transfer between two equal-frequency, opposed laser beams resonantly interacting with ion acoustic waves in a plasma drifting at the sound speed. The simulations and analysis illustrate the dependence of the energy transfer and the ion wave dynamics on laser intensities and detuning, and the time dependence of the phenomena. The simulation results are in qualitative agreement with experimental observations in the NOVA laser facility [E. M. Campbell et al., Rev. Sci. Instrum. 57, 2101 (1986)] at the Lawrence Livermore National Laboratory. This work is part of a continuing examination of possible resonant crossed-beam interactions in flowing plasmas and their potential effects on the fusion performance of current and future laser-fusion experiments with multiple crossing beams, e.g., proposed experiments in the National Ignition Facility [National Tech. Info. Service Document Nos. DE95017671-DE95017673 and DE95017676-DE95017700 (J. A. Paisner, E. M. Campbell, and W. J. Hogan, The Natl. Ignition Facility Project, UCRL-JC-117397 and UCRL-PROP-117093, May, 1994)]. (C) 1998 American Institute of Physics. [S1070-664X(98)01509-2] C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Cohen, BI (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 24 TC 18 Z9 19 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3408 EP 3415 DI 10.1063/1.873055 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900039 ER PT J AU Davidson, RC AF Davidson, RC TI Three-dimensional kinetic stability theorem for high-intensity charged particle beams SO PHYSICS OF PLASMAS LA English DT Article ID EQUILIBRIA AB Global conservation constraints obtained from the nonlinear Vlasov-Maxwell equations are used to derive a three-dimensional kinetic stability theorem for an intense non-neutral ion beam (or charge bunch) propagating in the z direction with average axial velocity upsilon(b) = const and characteristic kinetic energy (gamma(b)-1)mc(2) in the laboratory frame. Here, gamma(b) = (1 - upsilon(b)(2)/c(2))(-1/2) is the relativistic mass factor, and a perfectly conducting cylindrical wall is located at radius r=r2(w), where r=(x(2) +y(2))(1/2) is the radial distance from the beam axis. The particle motion in the beam frame (''primed'' coordinates) is assumed to be nonrelativistic, and the beam is assumed to have sufficiently high directed axial velocity that upsilon(b)much greater than\v'\. Space-charge effects and transverse electromagnetic effects are incorporated into the analysis in a fully self-consistent manner. The nonlinear Vlasov-Maxwell equations are Lorentz-transformed to the beam frame, and the applied focusing potential is assumed to have the (time-stationary) form psi(sf)'(x') = (gamma(b)m/2)[omega(beta perpendicular to)(2)(x'(2) + y'(2)) + omega(beta z)(2)z'(2)], where omega(beta perpendicular to) and up, are constant focusing frequencies. It is shown that a sufficient condition for linear and nonlinear stability for perturbations with arbitrary polarization about a beam equilibrium distribution f(eq)(x',p') is that f(eq) be a monotonically decreasing function of the single-particle energy, i.e., partial derivative f(eq)(H')/partial derivative H' less than or equal to 0. Here, H' = p'(2)/2m + psi(sf)'(x') + phi(eq)(x'), where phi(eq)(x') is the space-charge potential. (C) 1998 American Institute of Physics. [S1070-664X(98)01909-0] C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Davidson, RC (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 21 TC 28 Z9 28 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1998 VL 5 IS 9 BP 3459 EP 3468 DI 10.1063/1.873059 PG 10 WC Physics, Fluids & Plasmas SC Physics GA 117KR UT WOS:000075780900043 ER PT J AU Jones, S Kidder, R von Hippel, F AF Jones, S Kidder, R von Hippel, F TI The question of pure-fusion explosions under the CTBT SO PHYSICS TODAY LA English DT Editorial Material C1 Univ Calif Berkeley, Berkeley, CA 94720 USA. Princeton Univ, Princeton, NJ 08544 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Jones, S (reprint author), Univ Calif Berkeley, Berkeley, CA 94720 USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD SEP PY 1998 VL 51 IS 9 BP 57 EP 59 DI 10.1063/1.882464 PG 3 WC Physics, Multidisciplinary SC Physics GA 116XG UT WOS:000075749900020 ER PT J AU Benton, CC AF Benton, CC TI A place in the sun (Daniel Solomon's project for Beth Israel Memorial Chapel) SO PLACES-A FORUM OF ENVIRONMENTAL DESIGN LA English DT Article C1 Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Berkeley, CA USA. RP Benton, CC (reprint author), Univ Calif Berkeley, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU DESIGN HISTORY FOUNDATION PI LAWRENCE PA C/O PLACES, PO BOX 1897, LAWRENCE, KS 66044-8897 USA SN 0731-0455 J9 PLACES-FORUM ENVIRON JI Places-Forum Environ. Des. PD FAL PY 1998 VL 12 IS 1 BP 75 EP 75 PG 1 WC Architecture SC Architecture GA 132AQ UT WOS:000076607800022 ER PT J AU Heese-Peck, A Raikhel, NV AF Heese-Peck, A Raikhel, NV TI The nuclear pore complex SO PLANT MOLECULAR BIOLOGY LA English DT Review DE nuclear envelope; nuclear import; nuclear import receptor; nuclear pore complex; nucleoporin; O-linked GlcNAc modification ID LINKED N-ACETYLGLUCOSAMINE; SCANNING ELECTRON-MICROSCOPY; MESSENGER-RNA EXPORT; GTP-BINDING-PROTEIN; NUCLEOCYTOPLASMIC TRANSPORT; YEAST NUCLEOPORIN; LOCALIZATION SIGNAL; POLY(A)(+) RNA; PLANT NUCLEI; IN-VITRO AB The nuclear pore complex is the largest supramolecular complex that assembles in the eukaryotic cell. This structure is highly dynamic and must disassemble prior to mitosis and reassemble after the event. The directed movement of macromolecules into and out of the nucleus occurs through the nuclear pore complex, a potentially regulatory point for translocation. Using biochemical and genetic approaches, several nuclear pore complex proteins from yeast and vertebrates have been well characterized. Although very little is known about plant nuclear pore proteins, research is providing new information that indicates that plant nuclear pore complexes may have some unique features. C1 Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. RP Raikhel, NV (reprint author), Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. NR 141 TC 35 Z9 35 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD SEP PY 1998 VL 38 IS 1-2 BP 145 EP 162 DI 10.1023/A:1006020204649 PG 18 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA 113HC UT WOS:000075543800009 PM 9738965 ER PT J AU Chen, YR Hartman, FC Lu, TYS Larimer, FW AF Chen, YR Hartman, FC Lu, TYS Larimer, FW TI D-ribulose-5-phosphate 3-epimerase: Cloning and heterologous expression of the spinach gene, and purification and characterization of the recombinant enzyme SO PLANT PHYSIOLOGY LA English DT Article ID RIBULOSE 5-PHOSPHATE 3-EPIMERASE; GLYCERALDEHYDE-3-PHOSPHATE DEHYDROGENASE; PENTOSE-5-PHOSPHATE 3-EPIMERASE; ESCHERICHIA-COLI; CHLOROPLASTS; PHOSPHORIBULOKINASE; ASSIMILATION; CARBOXYLASE; MUTAGENESIS; COMPLEXES AB We have achieved, to our knowledge, the first high-level heterologous expression of the gene encoding D-ribulose-5-phosphate 3-epimerase from any source, thereby permitting isolation and characterization of the epimerase as found in photosynthetic organisms. The extremely labile recombinant spinach (Spinacia oleracea L.) enzyme was stabilized by DL-alpha-glycerophosphate or ethanol and destabilized by D-ribulose-5-phosphate or 2-mercaptoethanol. Despite this lability, the unprecedentedly high specific activity of the purified material indicates that the structural integrity of the enzyme is maintained throughout isolation. Ethylenediaminetetraacetate and divalent metal cations did not affect epimerase activity, thereby excluding a requirement for the latter in catalysis. As deduced from the sequence of the cloned spinach gene and the electrophoretic mobility under denaturing conditions of the purified recombinant enzyme, its 25-kD subunit size was about the same as that of the corresponding epimerases of yeast and mammals. However, in contrast to these other species, the recombinant spinach enzyme was octameric rather than dimeric, as assessed by gel filtration and polyacrylamide gel electrophoresis under nondenaturing conditions. Western-blot analyses with antibodies to the purified recombinant enzyme confirmed that the epimerase extracted from spinach leaves is also octameric. C1 Univ Tennessee, Oak Ridge Grad Sch Biomed Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Life Sci, Prot Engn Program, Oak Ridge, TN 37831 USA. RP Hartman, FC (reprint author), Univ Tennessee, Oak Ridge Grad Sch Biomed Sci, Oak Ridge, TN 37831 USA. NR 33 TC 8 Z9 9 U1 0 U2 3 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD SEP PY 1998 VL 118 IS 1 BP 199 EP 207 DI 10.1104/pp.118.1.199 PG 9 WC Plant Sciences SC Plant Sciences GA 120KG UT WOS:000075955100020 PM 9733539 ER PT J AU Burrell, KH Austin, ME Greenfieldt, CM Lao, LL Rice, BW Staebler, GM Stallard, BW AF Burrell, KH Austin, ME Greenfieldt, CM Lao, LL Rice, BW Staebler, GM Stallard, BW TI Effects of E x B velocity shear and magnetic shear in the formation of core transport barriers in the DIII-D tokamak SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID RADIAL ELECTRIC-FIELD; ENHANCED CONFINEMENT; D DISCHARGES; PLASMA; ENERGY; STABILITY; PROGRESS; PARTICLE AB Core transport barriers can be reliably formed in DIII-D by tailoring the evolution of the current density profile. This paper reports studies of the relative role of magnetic and E x B sheer in creating core transport barriers in the DIII-D tokamak and considers the detailed dynamics of the barrier formation. The core barriers seen in DIII-D negative shear discharges form in a stepwise fashion during the initial current ramp. The reasons for the stepwise formation are not known. Their extremely good shot to shot reproducibility suggests the steps are connected to a very reproducible plasma parameter such as the current density profile; however, the simple hypothesis that they occur each time q (0) or q(min) crosses an integer value is not consistent with all the data. The data from DIII-D are consistent with previous results that negative magnetic shear facilitates the formation of core transport barriers in the ion transport channel but is not necessary. However, strongly negative magnetic shear does allow formation of transport barriers in panicle, electron thermal, ion thermal and angular momentum transport channels. Shots with strong negative magnetic shear have produced the steepest ion temperature and toroidal rotation profiles seen yet in DIII-D. In addition, the E x B shearing rates seen in these shots exceed the previous DIII-D record value by a factor of four. C1 Gen Atom Co, San Diego, CA 92186 USA. Univ Texas, Austin, TX 78712 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. RP Burrell, KH (reprint author), Gen Atom Co, POB 85608, San Diego, CA 92186 USA. NR 23 TC 27 Z9 27 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD SEP PY 1998 VL 40 IS 9 BP 1585 EP 1596 DI 10.1088/0741-3335/40/9/003 PG 12 WC Physics, Fluids & Plasmas SC Physics GA 127KK UT WOS:000076349900003 ER PT J AU Shoeb, M Usmani, QN Bodmer, AR AF Shoeb, M Usmani, QN Bodmer, AR TI Lambda N Space-exchange effects in the s-shell hypernuclei and Be-9(Lambda) SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article DE hypernuclei; space-exchange Lambda N potential; variational Monte Carlo; Lambda N scattering ID BINDING-ENERGIES; 3-NUCLEON INTERACTION; 3-BODY; HE-6(LAMBDA-LAMBDA); HE-5(LAMBDA); 4-BODY AB Variational Monte Carlo calculations of the ground state separation energies B-Lambda of the s-shell hypernuclei and also of Be-9(Lambda) have been made for an Urbana-type central space-exchange Lambda N potential consistent with Lambda p scattering, and also including three-body Lambda NN forces. The s-shell hypernuclei are treated as A-body systems (A = baryon number), and Be-9(Lambda) is analysed as a partially nine-body problem in the Lambda - 2 alpha model. The reduction of B-Lambda due to the space-exchange Lambda N potential has been calculated for the s-shell hypernuclei for a range of interactions: both Lambda N and Lambda N + Lambda NN forces. For A = 3, 4, 5 the exchange energy is approximately, 0.04, 0.15 and 0.50 MeV, respectively. For Be-9(Lambda) a much more Limited study gives similar or equal to 1.3 MeV. These values are much larger than that for 'soft' Lambda N + NN potentials when the correlations are weak. C1 Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India. Jamia Millia Islamia, Dept Phys, New Delhi 110025, India. Univ Chicago, Dept Phys, Chicago, IL 60637 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Shoeb, M (reprint author), Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India. EM ms@amu.nic.in; usmni.ph@jmi.emet.in NR 21 TC 11 Z9 11 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD SEP-OCT PY 1998 VL 51 IS 3-4 BP 421 EP 432 DI 10.1007/BF02828935 PG 12 WC Physics, Multidisciplinary SC Physics GA 155PP UT WOS:000077955800009 ER PT J AU Kim, KK Hung, LW Yokota, H Kim, R Kim, SH AF Kim, KK Hung, LW Yokota, H Kim, R Kim, SH TI Crystal structures of eukaryotic translation initiation factor 5A from Methanococcus jannaschii at 1.8 angstrom resolution SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID HYPUSINE-CONTAINING PROTEIN; ELECTRON-DENSITY MAPS; SACCHAROMYCES-CEREVISIAE; DEOXYHYPUSINE SYNTHASE; ANOMALOUS DIFFRACTION; ESCHERICHIA-COLI; FACTOR EIF-5A; INHIBITORS; CELLS; PROLIFERATION AB Eukaryotic translation initiation factor 5A (eIF-5A) is a ubiquitous protein found in all eukaryotic cells. The protein is closely associated with cell proliferation in the G(1)-S stage of the cell cycle. Recent findings show that the eIF-5A proteins are highly expressed in tumor cells and act as a cofactor of the Rev protein in HIV-1-infected cells. The mature eIF is the only protein known to have the unusual amino acid hypusine, a post-translationally modified lysine. The crystal structure of eIF-5A from Methanococcus jannaschii (MJ eIF-5A) has been determined at 1.9;Angstrom and 1.8 Angstrom resolution in two crystal forms by using the multiple isomorphous replacement method and the multiwavelength anomalous diffraction method for the first crystal form and the molecular replacement method for the second crystal form. The structure consists of two folding domains, one of which is similar to the oligonucleotide-binding domain found in the prokaryotic cold shock protein and the translation initiation factor IF1 despite the absence of any significant sequence similarities. The 12 highly conserved amino acid residues found among eIF-5As include the hypusine site and form a long protruding loop at one end of the elongated molecule. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Kim, SH (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. EM shkim@lbl.gov NR 38 TC 86 Z9 94 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 1 PY 1998 VL 95 IS 18 BP 10419 EP 10424 DI 10.1073/pnas.95.18.10419 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 116NB UT WOS:000075730500016 PM 9724718 ER PT J AU Mosesson, MW Siebenlist, KR Meh, DA Wall, JS Hainfeld, JF AF Mosesson, MW Siebenlist, KR Meh, DA Wall, JS Hainfeld, JF TI The location of the carboxy-terminal region of gamma chains in fibrinogen and fibrin D domains SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE factor XIII; crosslinking; electron microscopy ID CROSS-LINKING; ELECTRON-MICROSCOPY; FACTOR-XIIIA; BINDING-SITES; FRAGMENT-D; CROSSLINKING; RECEPTOR; PROTEIN; POLYMERIZATION; IDENTIFICATION AB Elongated fibrinogen molecules are comprised of two outer "D" domains, each connected through a "coiled-coil" region to the central "E" domain. Fibrin forms following thrombin cleavage in the E domain and then undergoes intermolecular end-to-middle D:E domain associations that result in double-stranded fibrils. Factor XIIIa mediates crosslinking of the C-terminal regions of gamma chains in each D domain (the gamma(XL) site) by incorporating intermolecular epsilon-(gamma-glutamyl)lysine bonds between amine donor gamma 406 lysine of one gamma chain and a glutamine acceptor at gamma 398 or gamma 399 of another. Several lines of evidence show that crosslinked gamma chains extend "transversely" between the strands of each fibril, but other data suggest instead that crosslinked gamma chains can only traverse end-to-end-aligned D domains within each strand. To examine this issue and determine the location of the gamma(XL) site in fibrinogen and assembled fibrin fibrils, we incorporated an amine donor, thioacetyl cadaverine, into glutamine acceptor sites in fibrinogen in the presence of XIIIa, and then labeled the thiol with a relatively small (0.8 nm diameter) electron dense gold cluster compound, undecagold monoaminopropyl maleimide (Au-11). Fibrinogen was examined by scanning transmission electron microscopy to locate Au-11-cadaverine-labeled gamma 398/399 D domain sites. Seventy-nine percent of D domain Au-11 clusters were situated in middle to proximal positions relative to the end of the molecule, with the remaining Au-11 clusters in a distal position. In fibrin fibrils, D domain Au-11 clusters were located in middle to proximal positions. These findings show that most C-terminal gamma chains in fibrinogen or fibrin are oriented toward the central domain and indicate that gamma(XL) sites in fibrils are situated predominantly between strands, suitably aligned for transverse crosslinking. C1 Univ Wisconsin, Sch Med, Sinai Samaritan Med Ctr, Milwaukee, WI 53233 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Mosesson, MW (reprint author), Univ Wisconsin, Sch Med, Sinai Samaritan Med Ctr, Milwaukee Clin Campus, Milwaukee, WI 53233 USA. EM mosesson@facstaff.wisc.edu FU NCRR NIH HHS [RR-01777, P41 RR001777]; NHLBI NIH HHS [HL-47000] NR 38 TC 21 Z9 21 U1 0 U2 4 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 1 PY 1998 VL 95 IS 18 BP 10511 EP 10516 DI 10.1073/pnas.95.18.10511 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 116NB UT WOS:000075730500032 PM 9724734 ER PT J AU Ekman, ME Werner, PW Covan, JM D'Antonio, PE AF Ekman, ME Werner, PW Covan, JM D'Antonio, PE TI A thematic approach to system safety SO PROCESS SAFETY PROGRESS LA English DT Article AB Sandia National Laboratories (Sandia) has refined a process for developing inherently safer system designs based on methods used by Sandia to design detonation safety into nuclear weapons. The process was created when Sandia realized that standard engineering practices did not provide the level of safety assurance necessary for nuclear weapon operations, with their potential for catastrophic accidents. A systematic approach, which relies on mutually supportive design principles integrated through fundamental physical principles, was developed to ensure a predictably safe system response under a variety of operational and accident based stresses. Robust, safe system designs result from this thematic approach to safety, minimizing the number of safety critical features. This safety assurance process has two profound benefits: the process avoids the need to understand or limit the ultimate intensity of off-normal environments and it avoids the requirement to analyze and test a large array of accident environment scenarios (e.g., directional threats, sequencing of environments, time races, etc.) to demonstrate conformance to all safety requirements. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Ekman, ME (reprint author), Sandia Natl Labs, POB 5800,MS 0490, Albuquerque, NM 87185 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1066-8527 J9 PROCESS SAF PROG JI Process Saf. Prog. PD FAL PY 1998 VL 17 IS 3 BP 219 EP 224 DI 10.1002/prs.680170312 PG 6 WC Engineering, Chemical SC Engineering GA 120KR UT WOS:000075956000010 ER PT J AU Stone, JL Tsuo, YS Ullal, HS Wallace, WL Sastry, EVR Li, BS AF Stone, JL Tsuo, YS Ullal, HS Wallace, WL Sastry, EVR Li, BS TI PV electrification in India and China: The NREL's experience in international cooperation SO PROGRESS IN PHOTOVOLTAICS LA English DT Article AB The US Department of Energy (DOE) through its National Renewable Energy Laboratory (NREL) has initiated rural development projects in India and China to demonstrate the viability of photovoltaics in meeting the needs of the rural masses for cost-effective and reliable electricity. This paper contains clef ails of the major projects in the tao countries, along with descriptions of the implemented photovoltaic systems and lessons learned to date. The successful outcome of these projects will allow duplication of the experiences in other developing areas of the world. (C) 1998 John Wiley & Sons, Ltd. C1 NREL, Natl Ctr Photovltaics, Golden, CO 80401 USA. Minist Non Convent Energy Sources, New Delhi, India. State Sci & Technol Commiss, Beijing, Peoples R China. RP Ullal, HS (reprint author), NREL, Natl Ctr Photovltaics, 1617 Cole Blvd, Golden, CO 80401 USA. NR 12 TC 5 Z9 5 U1 0 U2 6 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1062-7995 J9 PROG PHOTOVOLTAICS JI Prog. Photovoltaics PD SEP-OCT PY 1998 VL 6 IS 5 BP 341 EP 356 DI 10.1002/(SICI)1099-159X(1998090)6:5<341::AID-PIP237>3.0.CO;2-S PG 16 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 132JQ UT WOS:000076626900006 ER PT J AU Stoldt, CR Cadilhe, AM Bartelt, MC Jenks, CJ Thiel, PA Evans, JW AF Stoldt, CR Cadilhe, AM Bartelt, MC Jenks, CJ Thiel, PA Evans, JW TI Formation and relaxation of 2D island arrays in metal(100) homoepitaxy SO PROGRESS IN SURFACE SCIENCE LA English DT Article; Proceedings Paper CT Bi-Annual International Seminar on Surface Physics (ISSP-19) CY JUN 15-19, 1998 CL POLANICA ZDROJ, POLAND SP Univ Wroclaw, Inst Exptl Phys ID DIFFUSION; COALESCENCE; SIMULATIONS; DEPOSITION; NUCLEATION; SURFACES; GROWTH AB We present a comprehensive analysis of both the formation of near-square islands during deposition in submonolayer metal(100) homoepitaxy, as well as the subsequent post-deposition relaxation of these island arrays. We highlight recent fundamental advances in our understanding of the nucleation and growth of islands, as well as of the kinetic pathways controlling the relaxation of island arrays (including a study of the "collision" and coalescence of diffusing islands). Extensive Scanning Tunneling Microscopy results are presented for the Ag/Ag(100) system at 295K, and these are analyzed utilizing kinetic Monte Carlo simulations of appropriate lattice-gas models. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Math, Ames, IA 50011 USA. Iowa State Univ, IPRT, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Sandia Natl Labs, Livermore, CA 94550 USA. RP Stoldt, CR (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RI Cadilhe, Antonio/G-1479-2016 OI Cadilhe, Antonio/0000-0002-0252-6992 NR 23 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6816 J9 PROG SURF SCI JI Prog. Surf. Sci. PD SEP-DEC PY 1998 VL 59 IS 1-4 BP 67 EP 77 DI 10.1016/S0079-6816(98)00036-7 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 156CL UT WOS:000077983800006 ER PT J AU Terwilliger, TC Waldo, G Peat, TS Newman, JM Chu, K Berendzen, J AF Terwilliger, TC Waldo, G Peat, TS Newman, JM Chu, K Berendzen, J TI Class-directed structure determination: Foundation for a protein structure initiative SO PROTEIN SCIENCE LA English DT Review DE biotechnology; class-directed structures; genome projects; microorganisms; protein structure determination ID COMPLETE GENOME SEQUENCE; BIOLOGY AB The recent sequencing of many complete genomes, combined with the development of methods that allow rapid structure determination for many proteins, has changed the way in which protein structure determinations can be approached. One-by-one determinations of individual protein structures will soon be augmented by class-directed structure analyses in which a group of proteins is targeted and structures of representative members are determined and used to represent the entire group. Such a shift in approach would be the foundation for a broad protein structure initiative targeting classes of proteins important for biotechnology and for a fundamental understanding of protein function. C1 Univ Calif Los Alamos Natl Lab, Struct Biol Grp, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Biophys Grp, Los Alamos, NM 87545 USA. RP Terwilliger, TC (reprint author), Univ Calif Los Alamos Natl Lab, Struct Biol Grp, POB 1663, Los Alamos, NM 87545 USA. RI Terwilliger, Thomas/K-4109-2012; Peat, Thomas/F-9817-2010; OI Terwilliger, Thomas/0000-0001-6384-0320; Peat, Thomas/0000-0002-6488-0831; Newman, Janet/0000-0003-2666-3219 NR 21 TC 70 Z9 71 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD SEP PY 1998 VL 7 IS 9 BP 1851 EP 1856 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 120KN UT WOS:000075955700001 PM 9761466 ER PT J AU Taylor, MG Rajpal, A Kirsch, JF AF Taylor, MG Rajpal, A Kirsch, JF TI Kinetic epitope mapping of the chicken lysozyme center dot HyHEL-10 Fab complex: Delineation of docking trajectories SO PROTEIN SCIENCE LA English DT Article DE epitope mapping; hen (chicken) egg-white lysozyme; HyHEL-10; monoclonal antibody; protein-protein interaction; site-directed mutagenesis; transition state ID SITE-DIRECTED MUTAGENESIS; EGG-WHITE LYSOZYME; PROTEIN ENGINEERING PROCEDURE; MONOCLONAL-ANTIBODY HYHEL10; DIFFUSION-LIMITED RATES; DOUBLE MUTANT CYCLES; BINDING-KINETICS; FREE-ENERGY; ANTIGEN; BARNASE AB The rate constants, k(on), for the formation of hen (chicken) lysozyme (HEWL).Fab-10 complexes have been determined for wild-type (WT) and epitope-mutated lysozymes by a homogeneous solution method based on the 95% reduced enzymatic activity of the complex. The values fall within a narrow 10-fold range [(0.18 to 1.92) X 10(6) M-1 s(-1)]. The affinity constants, K-D, cover a broader, 440-fold, range from 0.075 to 33 nM. Values of K-D as high as 7 mu M were obtained for the complexes prepared from some mutations at HEWL positions 96 and 97, but the associated kinetic constants could not be determined. The values of k(on) are negatively correlated with side-chain volume at position 101(HEWL), but are essentially independent of this parameter for position 21(HEWL) substitutions. The multiple mutations made at positions 21(HEWL) and 101(HEWL) provide sufficient experimental data on complex formation to evaluate Phi values [Phi = (Delta Delta G(on)(double dagger))/(Delta Delta G(D))] at these two positions to begin to define trajectories for protein-protein association. The data, when interpreted within the concept of a two-step association sequence embracing a metastable encounter complex intermediate, argue that the rate determining step at position 21(HEWL) (Phi(avg) = 0.2) is encounter complex formation, but the larger Phi(avg) value of 0.36 experienced for most position 101(HEWL) mutations indicates a larger contribution from the post-encounter annealing process at this site for these replacements. C1 Univ Calif Berkeley, Dept Mol & Cell Biol, Div Biochem & Mol Biol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Kirsch, JF (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, Div Biochem & Mol Biol, 229 Stanley Hall, Berkeley, CA 94720 USA. FU NIGMS NIH HHS [GM14514-01] NR 54 TC 33 Z9 33 U1 1 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD SEP PY 1998 VL 7 IS 9 BP 1857 EP 1867 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 120KN UT WOS:000075955700002 PM 9761467 ER PT J AU Rajpal, A Taylor, MG Kirsch, JF AF Rajpal, A Taylor, MG Kirsch, JF TI Quantitative evaluation of the chicken lysozyme epitope in the HyHEL-10 Fab complex: Free energies and kinetics SO PROTEIN SCIENCE LA English DT Article DE alanine scan mutagenesis; association dissociation kinetics; epitope mapping; hen egg-white lysozyme; monoclonal antibody HyHEL-10; protein-protein interaction ID SITE-DIRECTED MUTAGENESIS; EGG-WHITE LYSOZYME; MONOCLONAL-ANTIBODY HYHEL10; MUTATIONAL ANALYSIS; FUNCTIONAL EPITOPE; AVIAN LYSOZYME; IN-VIVO; PROTEIN; ANTIGEN; BINDING AB The hen (chicken) egg-white lysozyme (HEWL) epitope for the monoclonal antibody HyHEL-10 Fab (Fab-10) was investigated by alanine scan mutagenesis. The association rate constants (k(on)) for the HEWL.Fab-10 complexes were obtained from the homogenous solution method described in the preceding paper (Taylor et al., 1998), A new method for determining the dissociation rate constant (k(off)) for the complex, by trapping nascent free antibody with an inactive HEWL mutant is described. The values of k(on) fall within a factor of 2 of the wild-type (WT) HEWL value (1.43 +/- 0.13 x 10(6) M-1 s(-1)), while the increases in k(off) more nearly reflect the total change in free energies of the complex (Delta Delta G(D)). The dissociation constants (K-D) were measured directly in those cases where satisfactory kinetic data could not be obtained. The Y20A, K96A, and K97A HEWL.Fab-10 complexes are destabilized by more than 4 kcal/mol compared to the WT complex. The R21A, L75A, and D101A antibody complexes are moderately destabilized (0.7 < Delta Delta G(D) less than or equal to 1.0 kcal/mol). Additional mutations of the "hotspot" residues (Tyr20, Lys96, Lys97) were constructed to probe, more precisely, the nature of their contributions to complex formation. The results show that the entire hydrocarbon side chains of Tyr20 and Lys97, and only the E-amino group of Lys96, contribute to the stability of the complex. The value of Delta Delta G(D) for the R21A mutant complex is a distinct outlier in the Arg21 replacement series demonstrating the importance of supplementing alanine scan mutagenesis with additional mutations. C1 Univ Calif Berkeley, Dept Mol & Cell Biol, Div Biochem & Mol Biol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. RP Kirsch, JF (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, Div Biochem & Mol Biol, 229 Stanley Hall, Berkeley, CA 94720 USA. NR 32 TC 31 Z9 31 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD SEP PY 1998 VL 7 IS 9 BP 1868 EP 1874 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 120KN UT WOS:000075955700003 PM 9761468 ER PT J AU Hess, NJ Buchko, GW Conradson, SD Espinosa, FJ Ni, SS Thrall, BD Kennedy, MA AF Hess, NJ Buchko, GW Conradson, SD Espinosa, FJ Ni, SS Thrall, BD Kennedy, MA TI Human nucleotide excision repair protein XPA: Extended X-ray absorption fine-structure evidence for a metal-binding domain SO PROTEIN SCIENCE LA English DT Article DE DNA repair protein; EXAFS; metalloproteins; nucleotide excision repair; XPA ID DNA-DAMAGE RECOGNITION; PIGMENTOSUM GROUP-C; XERODERMA-PIGMENTOSUM; ZINC-FINGER; TRANSCRIPTION FACTOR; SITE; GENE; COMPLEMENTATION; COMPLEX; MUTANT AB The ubiquitous, multi-enzyme, nucleotide excision repair (NER) pathway is responsible for correcting a wide range of chemically and structurally distinct DNA lesions in the eukaryotic genome. Human XPA, a 31 kDa, zinc-associated protein, is thought to play a major NER role in the recognition of damaged DNA and the recruitment of other proteins, including RPA, ERCC1, and TFIIH, to repair the damage. Sequence analyses and genetic evidence suggest that zinc is associated with a C4-type motif, C105-X(2)-C108-X(17)-C126-X(2)-C129, located in the minimal DNA binding region of XPA (M98-F219). The zinc-associated motif is essential for damaged DNA recognition. Extended X-ray absorption fine structure (EXAFS) spectra collected on the zinc associated minimal DNA-binding domain of XPA (ZnXPA-MBD) show directly, for the first time, that the zinc is coordinated to the sulfur atoms of four cysteine residues with an average Zn-S bond length of 2.34 +/- 0.01 Angstrom. XPA-MBD was also expressed in minimal medium supplemented with cobalt nitrate to yield a blue-colored protein that was primarily (>95%) cobalt associated (CoXPA-MBD). EXAFS spectra collected on CoXPA-MBD show that the cobalt is also coordinated to the sulfur atoms of four cysteine residues with an average Co-S bond length of 2.33 +/- 0.02 Angstrom. C1 Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Mol Biosci Dept, Richland, WA 99352 USA. Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Kennedy, MA (reprint author), Pacific NW Lab, Environm Mol Sci Lab, POB 999, Richland, WA 99352 USA. EM ma_kennedy@pnl.gov RI Buchko, Garry/G-6173-2015; OI Buchko, Garry/0000-0002-3639-1061; Hess, Nancy/0000-0002-8930-9500 NR 52 TC 18 Z9 18 U1 0 U2 3 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD SEP PY 1998 VL 7 IS 9 BP 1970 EP 1975 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 120KN UT WOS:000075955700012 PM 9761477 ER PT J AU James, DFV AF James, DFV TI The Wolf effect and the redshift of quasars SO PURE AND APPLIED OPTICS LA English DT Article ID FREQUENCY-SHIFTS; SPECTRAL-LINES; SCATTERING; MEDIA AB We consider a simple model, based on currently accepted models for active galactic nuclei, for a quasi-stellar object (QSO or 'quasar') and examine the influence that correlation-induced spectral changes ('the Wolf effect') may have upon the redshifts of the optical emission lines. C1 Univ Calif Los Alamos Natl Lab, Div Theoret T4, Los Alamos, NM 87545 USA. RP James, DFV (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret T4, Mail Stop B-268, Los Alamos, NM 87545 USA. RI James, Daniel/B-9805-2009 OI James, Daniel/0000-0003-3981-4602 NR 21 TC 7 Z9 7 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-9659 J9 PURE APPL OPT JI Pure Appl. Opt. PD SEP PY 1998 VL 7 IS 5 BP 959 EP 970 DI 10.1088/0963-9659/7/5/006 PG 12 WC Optics SC Optics GA 122ZU UT WOS:000076102000006 ER PT J AU Friberg, AT James, DFV AF Friberg, AT James, DFV TI Physical optics and coherence theory SO PURE AND APPLIED OPTICS LA English DT Biographical-Item C1 Royal Inst Technol, Opt Sect, S-10044 Stockholm, Sweden. Univ Calif Los Alamos Natl Lab, Div Theoret T4, Los Alamos, NM 87545 USA. RP Friberg, AT (reprint author), Royal Inst Technol, Opt Sect, S-10044 Stockholm, Sweden. RI James, Daniel/B-9805-2009 OI James, Daniel/0000-0003-3981-4602 NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0963-9659 J9 PURE APPL OPT JI Pure Appl. Opt. PD SEP PY 1998 VL 7 IS 5 BP U3 EP U6 PG 4 WC Optics SC Optics GA 122ZU UT WOS:000076102000001 ER PT J AU Morgan, AE Brodie, JD Dewey, SL AF Morgan, AE Brodie, JD Dewey, SL TI What are we measuring with PET? SO QUARTERLY JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE tomography, emission computed; dopamine; serotonin; acetylcholine; GABA; neurotransmitters ID POSITRON EMISSION TOMOGRAPHY; BRAIN GLUCOSE-METABOLISM; ALZHEIMERS-DISEASE; MUSCARINIC RECEPTORS; CAUDATE-NUCLEUS; SENILE DEMENTIA; BINDING-SITES; DOPAMINE; SEROTONIN; SCHIZOPHRENIA AB Positron emission tomography is a medical imaging technique that provides unique information concerning many biochemical mechanisms underlying normal physiologic function. With respect to the central nervous system (CNS), selective radiolabeled compounds targeted at specific neurotransmitter receptor systems reveal information not only concerning receptor distribution and enzymatic activity but neurotransmitter concentrations as well. Recent advances in our understanding of these systems may be utilized to further understand changes in brain biochemistry that either result from or produce symptomatology associated with many CNS disease states. The ability to measure interactions between neurotransmitter systems in the human brain may also add to our knowledge of drug side effects and disease progression. While many CNS diseases have been defined as "neurotransmitter-specific" in nature, scientific data now suggests that changes in multiple neurotransmitter systems are evident in the brains of patients suffering from these classically described diseases. PET is a powerful tool that can be used to examine many of these changes in the living human brain. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NYU, Sch Med, Dept Psychiat, New York, NY USA. RP Dewey, SL (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. FU NIMH NIH HHS [MH-49165] NR 56 TC 4 Z9 5 U1 0 U2 1 PU EDIZIONI MINERVA MEDICA PI TURIN PA CORSO BRAMANTE 83-85 INT JOURNALS DEPT., 10126 TURIN, ITALY SN 1125-0135 J9 Q J NUCL MED JI Q. J. Nucl. Med. PD SEP PY 1998 VL 42 IS 3 BP 151 EP 157 PG 7 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 154NZ UT WOS:000077896300002 PM 9796363 ER PT J AU Benson, LV May, HM Antweiler, RC Brinton, TI Kashgarian, M Smoot, JP Lund, SP AF Benson, LV May, HM Antweiler, RC Brinton, TI Kashgarian, M Smoot, JP Lund, SP TI Continuous lake-sediment records of glaciation in the Sierra Nevada between 52,600 and 12,500 C-14 yr BP SO QUATERNARY RESEARCH LA English DT Article DE Tioga glaciation; Sierra Nevada; Owens Lake; Pyramid Lake ID RADIOCARBON AGES; LAHONTAN BASIN; OWENS LAKE; CLIMATE; CORALS; CALIBRATION; CALIFORNIA; DEPOSITION; CHRONOLOGY; SUBBASIN AB The chemistry of the carbonate-free clay-size fraction of Owens Lake sediments supports the use of total organic carbon and magnetic susceptibility as indicators of stadial-interstadial oscillations. Owens Lake records of total organic carbon, magnetic susceptibility, and chemical composition of the carbonate-free, clay-size fraction indicate that Tioga glaciation began similar to 24,500 and ended by similar to 13,600 C-14 yr B.P. Many of the components of glacial rock flour (e.g., TiO2, MnO, BaO) found in Owens Lake sediments achieved maximum values during the Tioga glaciation when valley glaciers reached their greatest extent, Total organic carbon and SiO2 (amorphous) concentrations reached minimum values during Tioga glaciation, resulting from decreases in productivity that accompanied the introduction of rock hour into the surface waters of Owens Lake. At least 20 stadial-interstadial oscillations occurred in the Sierra Nevada between 52,600 and 14,000 C-14 yr B.P. Total organic carbon data from a Pyramid Lake sediment core also indicate oscillations in glacier activity between >39,500 and similar to 13,600 C-14 yr B.P. Alpine glacier oscillations occurred on a frequency of less than or equal to 1900 yr in both basins, suggesting that millennial-scale oscillations occurred in California and Nevada during most of the past 52,600 yr. (C) 1998 University of Washington. C1 US Geol Survey, Boulder, CO 80303 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. US Geol Survey, Reston, VA 22092 USA. Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA. RP Benson, LV (reprint author), US Geol Survey, 3215 Marine St, Boulder, CO 80303 USA. RI Kashgarian, Michaele/E-1665-2011 OI Kashgarian, Michaele/0000-0001-7824-8418 NR 48 TC 45 Z9 45 U1 1 U2 10 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0033-5894 J9 QUATERNARY RES JI Quat. Res. PD SEP PY 1998 VL 50 IS 2 BP 113 EP 127 DI 10.1006/qres.1998.1993 PG 15 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA 128GV UT WOS:000076398300001 ER PT J AU Budinger, TF Berson, A McVeigh, ER Pettigrew, RI Pohost, GM Watson, JT Wickline, SA AF Budinger, TF Berson, A McVeigh, ER Pettigrew, RI Pohost, GM Watson, JT Wickline, SA TI Cardiac MR imaging: Report of a working group sponsored by the National Heart, Lung, and Blood Institute SO RADIOLOGY LA English DT Article DE heart, MR; magnetic resonance (MR), vascular studies; special reports AB Dramatic progress has been made over the past several years in the research and development of magnetic resonance (MR) techniques for imaging biologic structure and function, and much of this work has been supported by the National Institutes of Health (NIH). MR imaging has capabilities that are unique, as compared with other imaging modalities, for measurement and monitoring of biologic processes in vivo. Despite these capabilities, the use of MR imaging by cardiovascular and cardiopulmonary clinicians remains limited; in many institutions, clinicians rarely refer patients for MR examinations. The principal reasons for this include long imaging times with associated patient discomfort, low postprocessing speeds, inadequate access to patients during imaging, and lack of understanding of MR processes and benefits by clinicians and their associates. On October 28-29, 1996, the National Heart, Lung, and Blood Institute (NHLBI) sponsored a Working Group to explore the potential of MR for imaging the heart, lung, and vasculature. They recommend areas of research and development that could lead to more extensive clinical use of MR methods to improve the diagnosis and management of cardiovascular and cardiopulmonary disorders. Approximately 50 scientists, bioengineers, and clinicians from academia, industry, and government convened at the NIH Natcher Conference Center, Bethesda, Md.Dramatic progress has been made over the past several years in the research and development of magnetic resonance (MR) techniques for imaging biologic structure and function, and much of this work has been supported by the National Institutes of Health (NIH). MR imaging has capabilities that are unique, as compared with other imaging modalities, for measurement and monitoring of biologic processes in vivo. Despite these capabilities, the use of MR imaging by cardiovascular and cardiopulmonary clinicians remains limited; in many institutions, clinicians rarely refer patients for MR examinations. The principal reasons for this include long imaging times with associated patient discomfort, low postprocessing speeds, inadequate access to patients during imaging, and lack of understanding of MR processes and benefits by clinicians and their associates. On October 28-29, 1996, the National Heart, Lung, and Blood Institute (NHLBI) sponsored a Working Group to explore the potential of MR for imaging the heart, lung, and vasculature. They recommend areas of research and development that could lead to more extensive clinical use of MR methods to improve the diagnosis and management of cardiovascular and cardiopulmonary disorders. Approximately 50 scientists, bioengineers, and clinicians from academia, industry, and government convened at the NIH Natcher Conference Center, Bethesda, Md. C1 NHLBI, NIH, Bethesda, MD 20892 USA. Univ Calif Berkeley, Ctr Funct Imaging, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Johns Hopkins Univ, Sch Med, Dept Biomed Engn, Baltimore, MD 21205 USA. Emory Univ Hosp, Dept Radiol, Atlanta, GA 30322 USA. Univ Alabama, Div Cardiovasc Dis, Birmingham, AL 35294 USA. Jewish Hosp, Dept Internal Med, St Louis, MO USA. RP Berson, A (reprint author), NHLBI, NIH, 9000 Rockville Pike, Bethesda, MD 20892 USA. NR 0 TC 13 Z9 13 U1 0 U2 2 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 USA SN 0033-8419 J9 RADIOLOGY JI Radiology PD SEP PY 1998 VL 208 IS 3 BP 573 EP 576 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 112HN UT WOS:000075488200006 PM 9722831 ER PT J AU Morris, GM Coderre, JA Hopewell, JW Micca, PL Wielopolski, L AF Morris, GM Coderre, JA Hopewell, JW Micca, PL Wielopolski, L TI Boron neutron capture therapy: re-irradiation response of the rat spinal cord SO RADIOTHERAPY AND ONCOLOGY LA English DT Article DE BNCT; total effect; re-irradiation; rat spinal cord ID CENTRAL-NERVOUS-SYSTEM; P-BORONOPHENYLALANINE; RADIATION RESPONSE; X-RAYS; RETREATMENT; TOLERANCE; REIRRADIATION; DAMAGE AB Purpose: To evaluate the retreatment response of the CNS to BNC irradiation using a rat spinal cord model. Materials and methods, Fischer 344 rats were irradiated with single doses of 6 MeV X-rays which were 22, 40 or 80% of a total effect (TE). An additional group of rats was irradiated with a single exposure of thermal neutrons in the presence of the neutron capture agent boronophenylalanine (BPA) to a dose that represented 82% of the TE. After an interval of 26 weeks, animals were re-irradiated using various single doses of thermal neutrons in combination with BPA. Results: The re-irradiation ED50 doses represented 77, 80 or 50% of the TE after an initial X-ray dose of 22, 40 or 80% of the TE, respectively. The re-irradiation ED50 dose was 55% of the TE after an initial BNC irradiation dose representing 82% of the TE. Conclusion: The level of the initial radiation damage had a direct bearing on the re-irradiation response. Recovery following initial treatment with BNC irradiation was similar to that after initial irradiation with X-rays. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Univ Oxford, Churchill Hosp, Res Inst, Oxford OX3 7LJ, England. RP Coderre, JA (reprint author), Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0167-8140 J9 RADIOTHER ONCOL JI Radiother. Oncol. PD SEP PY 1998 VL 48 IS 3 BP 313 EP 317 DI 10.1016/S0167-8140(98)00060-7 PG 5 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA 145JK UT WOS:000077367300009 PM 9925251 ER PT J AU Schlapfer, D Borel, CC Keller, J Itten, KI AF Schlapfer, D Borel, CC Keller, J Itten, KI TI Atmospheric precorrected differential absorption technique to retrieve columnar water vapor SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID IMAGING SPECTROMETER DATA; AVIRIS DATA; AIRBORNE AB Differential absorption techniques are suitable to retrieve the total column water vapor contents from imaging spectroscopy data. A technique called Atmospheric Precorrected Differential Absorption (APDA) is derived directly from simplified radiative transfer equations. It combines a partial atmospheric correction with a differential absorption technique. The atmospheric path radiance term is iteratively corrected during the retrieval of water vapor. This improves the results especially over low background albedos. The error of the method for various ground reflectance spectra is below 7% for most of the spectra. The channel combinations for two test cases are then defined, using a quantitative procedure, which is based on MOD-TRAN simulations and the image itself. An error analysis indicates that the influence of aerosols and channel calibration is minimal. The APDA technique is then applied to two AVIRIS images acquired in 1991 and 1995. The accuracy of the measured water vapor columns is within a range of +/-5% compared to ground truth radiosonde data. (C)Elsevier Science Inc., 1998 C1 Univ Zurich, Dept Geog, Remote Sensing Lab, CH-8057 Zurich, Switzerland. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. Paul Scherrer Inst, Villigen, Switzerland. RP Schlapfer, D (reprint author), Univ Zurich, Dept Geog, Remote Sensing Lab, CH-8057 Zurich, Switzerland. RI Keller, Johannes/C-7732-2009; Borel, Christoph/P-2528-2014 NR 27 TC 71 Z9 75 U1 0 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD SEP PY 1998 VL 65 IS 3 BP 353 EP 366 DI 10.1016/S0034-4257(98)00044-3 PG 14 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA 112ZL UT WOS:000075524700011 ER PT J AU San Martin, RL AF San Martin, RL TI Energy future from the United States perspective SO RENEWABLE ENERGY LA English DT Article AB Affordable and abundant supplies of energy are essential to economic, environmental and national security. Clearly energy matters because: energy is a key economic driver; energy offers real market opportunities for business; energy impacts the environment; and energy is an important global commodity of strategic importance. (C) 1998 Published by Elsevier Science Ltd. All rights reserved. C1 US DOE, Washington, DC 20585 USA. RP San Martin, RL (reprint author), US DOE, 1000 Independence Ave SW, Washington, DC 20585 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 8 EP 9 PG 2 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900003 ER PT J AU Rannels, JE AF Rannels, JE TI Technology development in the US Photovoltaic Program SO RENEWABLE ENERGY LA English DT Article DE photovoltaics; US PV Program; Thin-Film Partnerships; PVMaT; million solar roofs initiative AB This paper explores the current activities of the U.S. Photovoltaic (PV) Program to advance the technological development and commercialization of PV technologies. The U.S. PV Program assists industry to develop photovoltaic technology that will both provide competitive electricity generation and become an important contributor to the national and global energy mix. Under the Program's leadership, great strides have been made in PV technology in recent years-in materials, manufacturing processes and products. Important technological and economic challenges remain, however, and the PV Program is addressing these through a multifaceted technology development strategy, comprised of strategic research and development, technology development, and systems engineering and applications. (C) 1998 Published by Elsevier Science Ltd. All rights reserved. C1 US DOE, Photovolta & Wind Technol Div, Washington, DC 20585 USA. RP Rannels, JE (reprint author), US DOE, Photovolta & Wind Technol Div, 1000 Independence Ave SW, Washington, DC 20585 USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 89 EP 94 DI 10.1016/S0960-1481(98)00142-6 PG 6 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900016 ER PT J AU Farhar, BC AF Farhar, BC TI Gender and renewable energy: Policy, analysis, and market implications SO RENEWABLE ENERGY LA English DT Article DE gender roles; renewable energy; energy policy; analysis; marketing; microcredit; training; sustainable development AB Women are the main producers of energy in developing countries and households are the main user of energy. Because gender roles and traditions have been largely ignored in energy, the global potential for renewable energy has been negatively affected. However, microcredit lending could fund sustainable development technology. This paper argues that renewable energy, gender roles, and microfinancing should be inherent pans of sustainable economic development programs. The relevant activities of pertinent development organizations and potential synergies are briefly described, the plans of the U.S. National Renewable Energy Laboratory to explore the gender issue are summarized, and the evolution of gender and energy as a field is addressed. (C) 1998 Published by Elsevier Science Ltd. All rights reserved. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Farhar, BC (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 19 TC 8 Z9 8 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 230 EP 239 DI 10.1016/S0960-1481(98)00164-5 PG 10 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900040 ER PT J AU Schoen, T Prasad, D Toggweiler, P Eiffert-Taylor, P Sorensen, H AF Schoen, T Prasad, D Toggweiler, P Eiffert-Taylor, P Sorensen, H TI Status report of task VII of the IEA program: PV in buildings SO RENEWABLE ENERGY LA English DT Article DE photovoltaics; building integration; strategy; implementation AB On January 1, 1997, a new Task started within IEA's PV Power Systems Program: Task VII. Objective of Task VII is to enhance the architectural quality, the technical quality and the economic viability of PV systems in the built environment and to assess and remove non-technical barriers for their introduction as an energy-significant option. The value of building integration for the introduction of grid connected PV is recognized around the world. Rooftop programs, aiming at large-scale application in the next century are carried out in many countries. In order to reach this widespread application, however, cost reductions still are essential. BIPV R&D should therefor focus on achieving these cost reductions, by optimizing integration concepts, by developing new building products and by the development of standardized products. Building integrated PV does not only offer perspectives for the next century. PV systems are installed today by building owners who appreciate the added value of solar roofs and facades, and who are willing to pay a premium for PV. This market potential must be captured and assisted. From the R&D side, this can be done by focusing on architectural issues and on non-technical barriers that impede short-term market penetration. The work in Task VII concentrates on all these aspects. The Task VII R&D strategy is to enhance systems technologies, to work on the architecture of building integrated PV and to assess and remove non-technical barriers that impede the widespread application of PV in the built environment. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Ecofys Energy & Environm, NL-3503 RK Utrecht, Netherlands. Univ New S Wales, Natl Solar Architecture Res Unit, Sydney, NSW 2052, Australia. ENECOLO, CH-8617 Monchaltorf, Switzerland. Natl Renewable Energy Lab, Ctr Energy Anal & Applicat, Golden, CO 80401 USA. Esbensen Consulting Engn, DK-2830 Virum, Denmark. RP Schoen, T (reprint author), Ecofys Energy & Environm, POB 8408, NL-3503 RK Utrecht, Netherlands. NR 8 TC 2 Z9 2 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 251 EP 256 DI 10.1016/S0960-1481(98)00169-4 PG 6 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900043 ER PT J AU Deb, SK AF Deb, SK TI Recent developments in high efficiency photovoltaic cells SO RENEWABLE ENERGY LA English DT Article DE thin films; solar cells; photovoltaics; amorphous silicon; copper gallium indium diselenide; cadmium telluride; gallium arsenide ID TANDEM SOLAR-CELLS AB Enormous progress has been made in recent years on a number of photovoltaic materials and devices in terms of conversion efficiencies. Efficiencies in the range of 18%-24% have been achieved in traditional silicon-based devices fabricated from both multicrystalline and single-crystal materials. Ultrahigh-efficiency (>30%) photovoltaic (PV) cells have been fabricated from gallium arsenide (GaAs) and its ternary alloys like gallium indium phosphide (GaInP2). The high-efficiency GaAs-based solar cells are being produced on a commercial scale, particularly for space applications. Major advances in efficiency have also been made on various thin-film solar cells based on amorphous silicon (aSi:H), copper gallium indium diselenide (CIGS), and cadmium telluride materials. This paper gives a brief overview of the recent progress in PV cell efficiencies based on these materials and devices. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Deb, SK (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 14 TC 7 Z9 9 U1 3 U2 14 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 467 EP 472 DI 10.1016/S0960-1481(98)00206-7 PG 6 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900080 ER PT J AU McConnell, RD Surek, T Witt, CE AF McConnell, RD Surek, T Witt, CE TI Progress in PV manufacturing technologies SO RENEWABLE ENERGY LA English DT Article DE photovoltaics; crystalline silicon; amorphous silicon; thin-film photovoltaics; photovoltaic manufacturing AB This paper discusses the different PV technologies in the market today in terms of their research and manufacturing status, as well as issues and advantages they are facing in their future. These technologies include crystalline silicon, amorphous silicon, cadmium telluride, copper indium gallium diselenide, and concentrators. Future generations of PV technologies-for example, the dye-sensitized photoelectrochemical cell-are discussed in the context of the richness of photovoltaic technology for opportunities to convert sunlight into electricity. (C) 1998 Published by Elsevier Science Ltd. C1 Natl Renewable Energy Lab, Golden, CO 80433 USA. RP McConnell, RD (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80433 USA. NR 4 TC 2 Z9 2 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-1481 J9 RENEW ENERG JI Renew. Energy PD SEP-DEC PY 1998 VL 15 IS 1-4 BP 502 EP 505 DI 10.1016/S0960-1481(98)00213-4 PG 4 WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels SC Science & Technology - Other Topics; Energy & Fuels GA 125GK UT WOS:000076228900087 ER PT J AU Schwoerer-Bohning, M Macrander, AT Abbamonte, PM Arms, DA AF Schwoerer-Bohning, M Macrander, AT Abbamonte, PM Arms, DA TI High resolution inelastic x-ray scattering spectrometer at the advanced photon source SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ENERGY-RESOLUTION; MONOCHROMATOR; BACKSCATTERING AB We have commissioned a new instrument for high resolution inelastic x-ray scattering on the inelastic scattering beamline of the Synchrotron Radiation Instrumentation Collaborative Access Team on sector 3 of the Advanced Photon Source. So far, the instrument is set up at 13.84 keV with a total energy resolution of 7.5 meV and a momentum resolution of less than or equal to 0.1 Angstrom(-1). We present technical details of the instrument, which includes an in-line monochromator, a focusing mirror, and a focusing analyzer. The performance of the instrument was demonstrated in studies of phonons in diamond and chromium. (C) 1998 American Institute of Physics. [S0034-6748(98)04109-4] C1 Argonne Natl Lab, Adv Photon Source, Expt Facil Div, Argonne, IL 60439 USA. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA. RP Schwoerer-Bohning, M (reprint author), Argonne Natl Lab, Adv Photon Source, Expt Facil Div, Argonne, IL 60439 USA. EM schwoere@aps.anl.gov NR 18 TC 18 Z9 18 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1998 VL 69 IS 9 BP 3109 EP 3112 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 119ML UT WOS:000075900200004 ER PT J AU Bilek, MMM Brown, IG AF Bilek, MMM Brown, IG TI Deposition probe technique for the determination of film thickness uniformity SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID VACUUM; TRANSPORT AB We describe a quantitative method of measuring film thickness profiles as deposited by plasma beams. Film thickness profiles are usually closely related to the plasma density profile of the depositing beam. The technique relies on the deposition of a semiopaque film over a large area transparent medium in situ and thus is particularly suitable for plasma systems used for thin film deposition. A simple and fast technique for quantifying the optical density versus position in the deposited film using a scanner and image processing software is described. The ability to quantify the relative optical density between different deposition profiles makes this a powerful tool for the study of the effects of process parameters on plasma density profiles and for the optimization of deposition systems. (C) 1998 American Institute of Physics. [S0034-6748(98)01909-1] C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England. RP Bilek, MMM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS 53-004,1 Cyclotron Rd, Berkeley, CA 94720 USA. EM mmmb@eng.cam.ac.uk NR 9 TC 18 Z9 18 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1998 VL 69 IS 9 BP 3353 EP 3356 DI 10.1063/1.1149100 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 119ML UT WOS:000075900200044 ER PT J AU Kang, S Hwang, YK Kim, M Lee, C Lee, KI AF Kang, S Hwang, YK Kim, M Lee, C Lee, KI TI A compliant controller dynamically updating the compliance center by contact localization SO ROBOTICA LA English DT Article DE compliant motion; motion planning; insertion; concave object; contact; planar robot; contact localization; stiffness control; moving compliance frame; real-time controller ID UNCERTAINTY AB This paper presents a compliant control method for insertion of complex objects with concavities. Most work on robot assembly using compliant motion control schemes focuses on overcoming jamming conditions for simple peg-in-hole problems, and cannot be used for complex shapes frequently encountered in assembly applications. When an object is being inserted to a hole or slot with a small clearance, a contact path is issued to compensate for uncertainties. When the object shape is complex, however, the contact state changes several times and severely, making compliant control difficult. The algorithm presented here is capable of generating satisfactory compliant motion control in spite of changing contact states. During the execution of a nominal motion plan, it computes the actual position of the contact point from the force/torque sensor reading using a contact localization algorithm. It then dynamically updates the center for compliance to the computed contact point, and minimize the chance of jamming and unwanted collisions. The control scheme has been implemented on hardware and tested on the task of inserting a T-shape into a C-shape involving a very tight tolerance. The insertion motion was accomplished by a sequence of 2 translational and 1 rotational compliant motions, and successfully executed by the proposed compliant motion controller. C1 Korea Adv Inst Sci & Technol, Humanoid Robot Res Ctr, Seoul, South Korea. Sandia Natl Labs, Intelligent Syst Principles Dept 9621, Albuquerque, NM 87185 USA. Seoul Natl Univ, Dept Mech Design & Prod Engn, Kwanak Gu, Seoul, South Korea. RP Korea Adv Inst Sci & Technol, Humanoid Robot Res Ctr, POB 131, Seoul, South Korea. EM kasch@kistmail.kist.re.kr; hwang@isrc.sandia.gov; ki@plaza.snu.ac.kr NR 23 TC 3 Z9 4 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0263-5747 EI 1469-8668 J9 ROBOTICA JI Robotica PD SEP-OCT PY 1998 VL 16 BP 543 EP 550 DI 10.1017/S0263574798000058 PN 5 PG 8 WC Robotics SC Robotics GA 132VF UT WOS:000076650800010 ER PT J AU Borisov, YA Garrett, BC AF Borisov, YA Garrett, BC TI Structure and isomerization of arenonium ions of dichlorobenzenes in the gas phase. A theoretical study SO RUSSIAN CHEMICAL BULLETIN LA English DT Article DE ab initio calculations; MP2 method; dichlorobenzenes; arenonium ions; proton affinity; 1,2-shifts of H and Cl atoms; activation energy ID PROTON AB Ab initio MP2 calculations of all isomeric arenonium ions (AI) of ortho-, meta-, and para-dichlorobenzenes in the gas phase were carried out with full optimization of geometry with the 6-31G* basis set. The calculated proton affinities depend substantially on the position of geminal center in the corresponding dichlorobenzenonium ion and decrease in the series 1,2-dichloro-4H-benzenonium > 1,2-dichloro-3H-benzenonium > 1,2-dichloro-2H-benzenonium; 1,3-dichloro-4H-benzenonium > 1,3-dichloro-2H-benzenonillm > I,3-dichloro-5H-benzenonium >1,3-dichloro-3H-benzenonium; 1,4-dichloro-2H-benzenonium > 1,4-dichloro-4H-benzenonium. The structures of transition states and activation energies (E-a) of almost all 1,2-shifts of H and Cl atoms in Al were determined. The activation energies of migrations of H atoms are about 6 kcal mol(-1) less than those of migrations of Cl atoms in similar structures. The isomerization routes and relations between the rate constants for isomerization of dichlorobenzenes through AI were established. C1 AN Nesmeyanov Organoelement Cpds Inst, Moscow 117813, Russia. Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Borisov, YA (reprint author), AN Nesmeyanov Organoelement Cpds Inst, 28 Ul Vavilova, Moscow 117813, Russia. RI Garrett, Bruce/F-8516-2011 NR 15 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA CONSULTANTS BUREAU, 233 SPRING ST, NEW YORK, NY 10013 USA SN 1066-5285 J9 RUSS CHEM B+ JI Russ. Chem. Bull. PD SEP PY 1998 VL 47 IS 9 BP 1677 EP 1682 DI 10.1007/BF02495684 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA 133ZV UT WOS:000076718200006 ER PT J AU Mohan, A Khanna, N Hwu, J Joy, DC AF Mohan, A Khanna, N Hwu, J Joy, DC TI Secondary electron imaging in the variable pressure scanning electron microscope SO SCANNING LA English DT Article DE variable pressure SEM; secondary electrons; detectors; ions AB Secondary electron imaging is not possible in the variable pressure scanning electron microscope because the mean free path of the secondaries in the gas is too shea to permit them to reach the detector. This paper therefore investigates an alternative strategy for producing an image containing significant amounts of secondary electron contrast. This involves modifying the microscope by the addition of a biased electrode above the sample and then collecting a specimen current signal. This system, originally described by Farley and Shah (1988), is found to produce true secondary electron detail over a wide range of conditions. C1 Univ Tennessee, EM Facil, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Joy, DC (reprint author), Univ Tennessee, EM Facil, Knoxville, TN 37996 USA. NR 14 TC 30 Z9 30 U1 0 U2 5 PU FAMS INC PI MAHWAH PA BOX 832, MAHWAH, NJ 07430 USA SN 0161-0457 J9 SCANNING JI Scanning PD SEP PY 1998 VL 20 IS 6 BP 436 EP 441 PG 6 WC Instruments & Instrumentation; Microscopy SC Instruments & Instrumentation; Microscopy GA 138GW UT WOS:000076964600003 ER PT J AU Quintana-Orti, G Sun, IB Bischof, CH AF Quintana-Orti, G Sun, IB Bischof, CH TI A BLAS-3 version of the QR factorization with column pivoting SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE QR factorization; column pivoting; rank revealing factorization; block algorithm ID SINGULAR VALUE DECOMPOSITION; RANK AB The QR factori ation with column pivoting (QRP), originally suggested by Golub [Numer. Math., 7 (1965), 206-216], is a popular approach to computing rank-revealing factori ations. Using Level 1 BLAS, it was implemented in LINPACK, and, using Level 2 BLAS, in LAPACK. While the Level 2 BLAS version delivers superior performance in general, it may result in worse performance for large matrix si es due to cache e ects. We introduce a modification of the QRP algorithm which allows the use of Level 3 BLAS kernels while maintaining the numerical behavior of the LINPACK and LAPACK implementations. Experimental comparisons of this approach with the LINPACK and LAPACK implementations on IBM RS/6000, SGI R8000, and DEC A P platforms show considerable performance improvements. C1 Duke Univ, Dept Comp Sci, Levine Sci Res Ctr, Durham, NC 27706 USA. Univ Tennessee, Dept Comp Sci, Knoxville, TN 37996 USA. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Quintana-Orti, G (reprint author), Univ Jaime I, Dept Informat, Castellon, Spain. RI Bischof, Christian/D-2897-2009 NR 26 TC 25 Z9 25 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD SEP PY 1998 VL 19 IS 5 BP 1486 EP 1494 PG 9 WC Mathematics, Applied SC Mathematics GA 107ZL UT WOS:000075241100005 ER PT J AU Brown, PN Hindmarsh, AC Petzold, LR AF Brown, PN Hindmarsh, AC Petzold, LR TI Consistent initial condition calculation for differential-algebraic systems SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article ID CONVERGENCE THEORY; KRYLOV METHODS; EQUATIONS AB In this paper we describe a new algorithm for the calculation of consistent initial conditions for a class of systems of differential-algebraic equations which includes semi-explicit index-one systems. We consider initial condition problems of two types-one where the differential variables are specified, and one where the derivative vector is specified. The algorithm requires a minimum of additional information from the user. We outline the implementation in a general-purpose solver DASPK for differential-algebraic equations, and present some numerical experiments which illustrate its effectiveness. C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. RP Brown, PN (reprint author), Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, L-316, Livermore, CA 94551 USA. NR 21 TC 63 Z9 63 U1 0 U2 5 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD SEP PY 1998 VL 19 IS 5 BP 1495 EP 1512 DI 10.1137/S1064827595289996 PG 18 WC Mathematics, Applied SC Mathematics GA 107ZL UT WOS:000075241100006 ER PT J AU Golub, GH Huang, LC Simon, H Tang, WP AF Golub, GH Huang, LC Simon, H Tang, WP TI A fast Poisson solver for the finite difference solution of the incompressible Navier-Stokes equations SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE fast solver; generalized eigenvalues; Poisson equation; incompressible Navier-Stokes equations ID NUMERICAL-SOLUTION; PROJECTION METHOD; ALGORITHM AB In this paper, a fast direct solver for the Poisson equation on the half-staggered grid is presented. The Poisson equation results from the projection method of the finite difference solution of the incompressible Navier-Stokes equations. To achieve our goal, new algorithms for diagonalizing a semidefinite pair are developed. The fast solver can also be extended to the three-dimensional case. The motivation and related issues in using this half-staggered grid are also discussed. C1 Stanford Univ, Dept Comp Sci, Stanford, CA 94305 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, NERSC Div, Berkeley, CA 94720 USA. Univ Waterloo, Dept Comp Sci, Waterloo, ON N2L 3G1, Canada. RP Golub, GH (reprint author), Stanford Univ, Dept Comp Sci, Stanford, CA 94305 USA. NR 24 TC 13 Z9 14 U1 0 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD SEP PY 1998 VL 19 IS 5 BP 1606 EP 1624 DI 10.1137/S1064827595285299 PG 19 WC Mathematics, Applied SC Mathematics GA 107ZL UT WOS:000075241100012 ER PT J AU Sanchez, A Bishop, AR AF Sanchez, A Bishop, AR TI Collective coordinates and length-scale competition in spatially inhomogeneous soliton-bearing equations SO SIAM REVIEW LA English DT Article DE solitons; spatially dependent perturbations; perturbation theories; nonperturbative results; collective coordinates; length scales; sine-Gordon; nonlinear Schrodinger ID SINE-GORDON SOLITONS; NONLINEAR SCHRODINGER-EQUATION; PERIODIC POTENTIALS; NUMERICAL-INTEGRATION; PERTURBATION-THEORY; DISORDERED-SYSTEMS; DISCRETE LATTICE; KINK DYNAMICS; PHI(4) MODEL; PROPAGATION AB Perturbed, one-dimensional, integrable (i.e., soliton-bearing) equations arise in many applied contexts when trying to improve the (usually highly idealized) description of problems of interest in terms of the purely integrable equations. In particular, when the assumption of perfect homogeneity is dropped to account for unavoidable impurities or defects, perturbations depending on the spatial coordinate must be added to the original equation. In this review, we use the one-dimensional sine-Gordon (sG) equation perturbed by a spatially periodic term as a generic paradigm to discuss the main perturbative techniques available for the study of this class of problems. To place the work in context, we summarize the approaches developed to date and focus on the collective coordinate approach as one of the most useful tools. We introduce several versions of this perturbative method and relate them to more involved procedures. We analyze in detail the application to the sG equation, but the procedure is very general. To illustrate this other examples of the application of collective coordinates are briefly revisited. In our case study, this approach helps us identify perturbative and nonperturbative regimes, yielding a very simple picture of the former. Beyond perturbative calculations, the same example of the inhomogeneous sG equation allows us to introduce a phenomenon, termed length scale competition, which we show to be a rather general mechanism for the appearance of complex spatiotemporal behavior in perturbed integrable systems, as other instances discussed in the review show. Such nonperturbative results are obtained by means of numerical simulations of the full perturbed problem; numerical linear stability analysis is also used to clarify the origins of the instability originated by this competition. To complement our description of the techniques employed in these studies, computational details of our numerical simulations are also included. Finally, the paper closes with a discussion of the above ideas and a speculative outlook on general questions concerning the interplay of nonlinearity with disorder. C1 Univ Carlos III Madrid, Dept Matemat, Grp Interdisciplinar Sistemas Complicados, Madrid 28911, Spain. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA. RP Sanchez, A (reprint author), Univ Carlos III Madrid, Dept Matemat, Grp Interdisciplinar Sistemas Complicados, C Butarque 15, Madrid 28911, Spain. EM anxo@dulcinea.uc3m.es RI Sanchez, Angel/A-9229-2008 OI Sanchez, Angel/0000-0003-1874-2881 NR 76 TC 66 Z9 66 U1 0 U2 3 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1445 J9 SIAM REV JI SIAM Rev. PD SEP PY 1998 VL 40 IS 3 BP 579 EP 615 PG 37 WC Mathematics, Applied SC Mathematics GA 111JZ UT WOS:000075434700005 ER PT J AU Brooks, SC Taylor, DL Jardine, PM AF Brooks, SC Taylor, DL Jardine, PM TI Thermodynamics of bromide exchange on ferrihydrite: Implications for bromide transport SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID ANION EXCLUSION; ION-TRANSPORT; MOVEMENT; SAMPLES; COLUMNS; CHARGE; OXISOL; SOILS AB Because Br- is often assumed to be nonreactive with mineral surfaces, it is frequently employed as a tracer in transport experiments. We investigated the thermodynamics of Br--Cl- exchange on the synthetic ferric oxide ferrihydrite [Fe5O7(OH). 4H(2)O], Even with 475 times mure Cl- than Br- in solution, sites on the ferrihydrite surface selectively adsorbed Br-. The implications of these results for Br transport were examined in a series of column now experiments. During flow through columns packed with ferrihydrite-coated silica, Br- retardation increased from 0.912 to 2.42 as the pH of column experiments decreased from 7.8 to 5, This behavior is consistent with the variable-charge nature of ferrihydrite, which exhibits increasing positive surface charge below the pH of its zero point of charge (pH(zpc) approximate to 7.5). These results show that Br- can behave as a reactive tracer under certain circumstances, thus lending to erroneous estimates of transport parameters that rely solely on the use of Br- as a nonreactive solute. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Brooks, SC (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008,MS 6038, Oak Ridge, TN 37831 USA. EM 3sb@ornl.gov RI Brooks, Scott/B-9439-2012 OI Brooks, Scott/0000-0002-8437-9788 NR 32 TC 19 Z9 19 U1 0 U2 5 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 0361-5995 EI 1435-0661 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD SEP-OCT PY 1998 VL 62 IS 5 BP 1275 EP 1279 PG 5 WC Soil Science SC Agriculture GA 130CF UT WOS:000076500900018 ER PT J AU Lemke, RL Izaurralde, RC Nyborg, M AF Lemke, RL Izaurralde, RC Nyborg, M TI Seasonal distribution of nitrous oxide emissions from soils in the Parkland region SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID LANDSCAPE SCALE; DENITRIFICATION; ALBERTA; FERTILIZERS; LOSSES; FLUXES AB The temporal variability of soil-derived N2O emissions presents a major challenge to the accurate quantification of N2O-N losses from agroecosystems. We characterized the seasonal distribution of N2O emissions from two agricultural sites in the Parkland region of Alberta during 1993 and 1993. Treatments studied were fallow, and spring wheat (Triticum aestivum L.) with and without urea fertilizer, under conventional till management. Gas samples were collected from vented static soil chambers and were analyzed for N2O with a gas chromatograph equipped with a Ni-63 electron capture detector. Soil water content and concentrations of NO3--N, NH4+-N, and water-soluble organic C (WSOC) were measured several times during the season. A brief burst of N2O emission was recorded at both sites during and immediately following spring snow melt. A second period of activity occurred between mid-June and mid-July. Between 16 and 60% of estimated annual N2O-N loss occurred during spring thaw, while >80% of cumulative annual N2O-N Loss had occurred by mid-July. Mean soil NO3--N concentration explained up to 65% of the temporal variability in geometric mean N2O emissions. A multiple regression model that included fall soil concentrations of NO3-N, NH4+-N, and WSOC explained 94% of the variability in estimated cumulative N2O-N loss during the following spring thaw. Most N2O-N losses in the Parkland region appear to occur during spring thaw and early summer; therefore, sampling schedules need to focus on these time periods. Management practices that minimize N availability during spring thaw may be an effective mitigation strategy for this region. C1 Agr & Agri Food Canada, Lethbridge Res Ctr, Lethbridge, AB T1J 4B1, Canada. Battelle PNNL, Washington, DC 20024 USA. Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada. RP Lemke, RL (reprint author), Agr & Agri Food Canada, Lethbridge Res Ctr, Lethbridge, AB T1J 4B1, Canada. RI Izaurralde, Roberto/E-5826-2012 NR 26 TC 42 Z9 45 U1 3 U2 22 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD SEP-OCT PY 1998 VL 62 IS 5 BP 1320 EP 1326 PG 7 WC Soil Science SC Agriculture GA 130CF UT WOS:000076500900025 ER PT J AU Burch, JD Thomas, KE AF Burch, JD Thomas, KE TI Water disinfection for developing countries and potential for solar thermal pasteurization SO SOLAR ENERGY LA English DT Article; Proceedings Paper CT Solar World Congress of the International-Solar-Energy-Society CY AUG 24-29, 1997 CL TAEJON, SOUTH KOREA SP Int Solar Energy Soc AB Water-borne disease in developing countries leads to millions of deaths and billions of illnesses annually. Water disinfection is one of several interventions that can improve public health, especially if part of a broad program that considers all disease transmission routes and sustainably involves the community. Considering water volumes less than or similar to 30 m(3)/day, appropriate disinfection methods include chlorination, slow sand filtration, ultraviolet (UV) radiation and pasteurization. Pretreatment with a coarse roughing filtration is generally used with the first three of these technologies to reduce turbidity and maintain high effectiveness. Cysts and worm eggs are resistant to chlorination and UV but can be filtered relatively easily. Chlorination is widely used and inexpensive but requires a continual supply of chemicals. Slow sand filtration is lowest in cost but requires high investment in labor. Household filtration using indigenous devices requires little capital investment but is relatively ineffective and difficult to properly maintain. Batch treatment with solar UV is very easy to implement but effectiveness in practice is uncertain since temperatures above 50 degrees C should be attained. UV lamp devices are inexpensive and easy to use but require power and access to maintenance infrastructure. Boiling of water requires no initial expense but fuel and labor costs are very high. Solar pasteurization devices (batch and flow-through) are effective and relatively maintenance-free, but existing products yield high treatment cost. Flow-through systems with selective Rat plate collectors become cost-competitive with UV technology at costs of about $380/m(2) and $80/m(2) for home-scale and village-scale use, respectively. These cost goals might be attained with polymer thin film designs if durability issues are adequately resolved. Published by Elsevier Science Ltd. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Burch, JD (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 27 TC 26 Z9 26 U1 0 U2 15 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-092X J9 SOL ENERGY JI Sol. Energy PD SEP PY 1998 VL 64 IS 1-3 BP 87 EP 97 DI 10.1016/S0038-092X(98)00036-X PN 1 PG 11 WC Energy & Fuels SC Energy & Fuels GA 136BJ UT WOS:000076837600012 ER PT J AU Ramanathan, K Noufi, R Granata, J Webb, J Keane, J AF Ramanathan, K Noufi, R Granata, J Webb, J Keane, J TI Prospects for in situ junction formation in CuInSe2 based solar cells SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT International Symposium on H2 Fuel Cell Photovoltaic Systems CY AUG 31-SEP 05, 1998 CL CANCUN, MEXICO DE in situ junction formation; CuInSe2 AB In this paper we describe our research efforts directed towards the understanding of the CdS/CuInGase(2) junctions and, specifically, the interaction of the chemical bath with the CuInGaSe2. Information gained from these studies has been used to develop a set of criteria for forming junctions without the need for chemical bath deposition or CdS. Our approach differs from many others previously used "alternative buffer layer" methods which appear to be somewhat problematic in implementation as well as in the quality of the results. This "buffer-free" technology has resulted in a 13.5% efficiency cell. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ramanathan, K (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 8 TC 35 Z9 35 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD SEP PY 1998 VL 55 IS 1-2 BP 15 EP 22 DI 10.1016/S0927-0248(98)00042-7 PG 8 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 119XM UT WOS:000075923700004 ER PT J AU Calixto, ME Bhattacharya, RN Sebastian, PJ Fernandez, AM Gamboa, SA Noufi, RN AF Calixto, ME Bhattacharya, RN Sebastian, PJ Fernandez, AM Gamboa, SA Noufi, RN TI Cu(In,Ga)Se-2 based photovoltaic structure by electrodeposition and processing SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT International Symposium on H2 Fuel Cell Photovoltaic Systems CY AUG 31-SEP 05, 1998 CL CANCUN, MEXICO DE Cu(In,Ga)Se-2; CdS,ZnO; photovoltaic structure; electrodeposition ID CUINSE2 THIN-FILMS; SOLAR-CELLS AB CuIn1-xGaxSe2 (CIGS) thin films were formed from an electrodeposited CuInSe2 (CIS) precursor by thermal processing in vacuum in which the film stoichiometry was adjusted by adding In, Ga and Se. The structure, composition, morphology and opto-electronic properties of the as-deposited and selenized CIS precursors were characterized by various techniques. A 9.8% CIGS based thin film solar cell was developed using the electrodeposited and processed him. The cell structure consisted of Mo/CIGS/CdS/ZnO/MgF2. The cell parameters such as J(sc), V-oc, FF and eta were determined from I-V characterization of the cell. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Energy Res Ctr, Solar H2 Fuel Cell Area, Temixco 62580, Morelos, Mexico. NREL, Golden, CO 80401 USA. RP Calixto, ME (reprint author), Univ Nacl Autonoma Mexico, Energy Res Ctr, Solar H2 Fuel Cell Area, Temixco 62580, Morelos, Mexico. OI Calixto, Ma. Estela/0000-0002-9611-3346 NR 12 TC 22 Z9 26 U1 0 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD SEP PY 1998 VL 55 IS 1-2 BP 23 EP 29 DI 10.1016/S0927-0248(98)00043-9 PG 7 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 119XM UT WOS:000075923700005 ER PT J AU Ahrenkiel, RK Johnston, S AF Ahrenkiel, RK Johnston, S TI Contactless measurement of recombination lifetime in photovoltaic materials SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT International Symposium on H2 Fuel Cell Photovoltaic Systems CY AUG 31-SEP 05, 1998 CL CANCUN, MEXICO DE recombination; photovoltaics ID SEMICONDUCTORS AB Contactless measurement of important semiconductor parameters has become the goal of current semiconductor diagnostics. Here we will describe an improved version of radiofrequency photoconductive decay operating in the ultra-high frequency (UHF) region. Previous work has referred to the general technique as UHF photoconductive decay. This work will show that the improved technique is capable of measuring samples ranging in size from submicron thin films to large silicon ingots. The UHF frequency region is an ideal compromise for volume penetration and lifetime resolution with system response or 10 ns or less. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ahrenkiel, RK (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. EM richard_ahrenkiel@nrel.gov NR 14 TC 29 Z9 29 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD SEP PY 1998 VL 55 IS 1-2 BP 59 EP 73 DI 10.1016/S0927-0248(98)00047-6 PG 15 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 119XM UT WOS:000075923700009 ER PT J AU Bhattacharya, RN Batchelor, W Granata, JE Hasoon, F Wiesner, H Ramanathan, K Keane, J Noufi, RN AF Bhattacharya, RN Batchelor, W Granata, JE Hasoon, F Wiesner, H Ramanathan, K Keane, J Noufi, RN TI CuIn1-xGaxSe2-based photovoltaic cells from electrodeposited and chemical bath deposited precursors SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article; Proceedings Paper CT International Symposium on H2 Fuel Cell Photovoltaic Systems CY AUG 31-SEP 05, 1998 CL CANCUN, MEXICO DE electrodeposition; chemical bath deposition; copper-indium-gallium-selenide; physical vapor deposition; photovoltaic device ID SOLAR-CELLS; THIN-FILMS; DEVICE AB We have fabricated 13.7%- and 7.3%-efficient CuIn1-xGaxSe2 (CIGS)-based devices from electrodeposited and chemical bath deposited precursors. As-deposited precursors are Cu-rich films and polycrystalline (grain size is very small) in nature. Only preliminary data is presented on chemical bath deposited precursors. Additional In, Ga, and Se were added to the precursor films by physical evaporation to adjust the final composition to CuIn1-xGaxSe2. Addition of In and Ga and also selenization at high temperature are very crucial to obtain high efficiency devices. Three devices with Ga/(In + Ga) ratios of 0.16, 0.26, and 0.39 were fabricated from electrodeposited precursors. The device fabricated from the chemical bath deposited precursor had a Ga/(In + Ga) ratio of 0.19. The films/devices have been characterized by inductive-coupled plasma spectrometry, Auger electron spectroscopy, X-ray diffraction, electron-probe microanalysis, current-voltage characteristics, capacitance-voltage, and spectral response. The compositional uniformity of the electrodeposited precursor films both in the vertical and horizontal directions were studied. The electrodeposited device parameters are compared with those of a 17.7% physical vapor deposited device. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Bhattacharya, RN (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 12 TC 44 Z9 47 U1 2 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD SEP PY 1998 VL 55 IS 1-2 BP 83 EP 94 DI 10.1016/S0927-0248(98)00049-X PG 12 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 119XM UT WOS:000075923700011 ER PT J AU Cho, H Donovan, SM Mackenzie, JD Abernathy, CR Pearton, SJ Han, J Shul, RJ Lee, JW AF Cho, H Donovan, SM Mackenzie, JD Abernathy, CR Pearton, SJ Han, J Shul, RJ Lee, JW TI High resolution pattern transfer in III-nitrides using BCl3/Ar inductively coupled plasmas SO SOLID-STATE ELECTRONICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; ETCHING CHARACTERISTICS; V NITRIDES; GAN; ALN; INN; DRY; SEMICONDUCTORS AB High anisotropic features are formed in GaN, AlN, InN, In0.5Ga0.5N and In0.5Al0.5N using BCl3/Ar inductively coupled plasmas. Etch rates of 1.1 mu m x min(-1) for InN and 2.2 mu m x min(-1) for In0.5Ga0.5N were obtained, the highest reported for these materials. Selectivities of 20 for InN over AlN and 7 for InN over GaN were obtained. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Plasma Therm, St Petersburg, FL 33716 USA. RP Cho, H (reprint author), Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD SEP PY 1998 VL 42 IS 9 BP 1719 EP 1722 DI 10.1016/S0038-1101(98)00135-X PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA 123ZR UT WOS:000076156200013 ER PT J AU Goretta, KC Park, ET Guan, J Balachandran, U Dorris, SE Routbort, JL AF Goretta, KC Park, ET Guan, J Balachandran, U Dorris, SE Routbort, JL TI Diffusional creep of BaCe0.8Y0.2O3-alpha mixed conductors SO SOLID STATE IONICS LA English DT Article DE creep; cation; diffusion; perovskite; proton conductor ID TRANSPORT-PROPERTIES; SOLID-ELECTROLYTE; COMPRESSIVE CREEP; HIGH-TEMPERATURES; LOWER MANTLE; PEROVSKITE; YBA2CU3OX; OXYGEN; VISCOSITY; OXIDES AB Compressive creep tests of BaCe0.8Y0.2O3-alpha polycrystals were conducted in Ar to determine deformation rate and calculate the diffusivity of the rate-controlling diffusing species for diffusional creep. At 1200-1450 degrees C, the steady-state strain rate ((epsilon) over dot) could be expressed as (epsilon) over dot = A sigma(1.1+/-0.1) exp[(- 343+/-30 kJ/mole)/RT] where A is a constant, sigma is the steady-state stress, R is the universal gas constant, and T is the absolute temperature. The data and microstructural observations indicated that creep occurred by a grain-boundary-sliding mechanism, which was probably controlled by lattice diffusion of either Ba or Ce. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Goretta, KC (reprint author), Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. NR 50 TC 25 Z9 25 U1 2 U2 9 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 SEP PY 1998 VL 111 IS 3-4 BP 295 EP 299 DI 10.1016/S0167-2738(98)00176-3 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 128UJ UT WOS:000076425400011 ER PT J AU Gentzler, M Patil, S Reimer, JA Denn, MM AF Gentzler, M Patil, S Reimer, JA Denn, MM TI Molecular motion and orientation distributions in melt-processed, fully aromatic liquid crystalline polyesters from H-1 NMR SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE liquid crystal polymer; molecular motion; orientation distribution ID X-RAY-SCATTERING; 6-HYDROXY-2-NAPHTHOIC ACID; THERMOTROPIC COPOLYESTERS; 4-HYDROXYBENZOIC ACID; POLYMER; RELAXATION; DYNAMICS; ECHO; FLOW AB Fully-aromatic thermotropic liquid crystalline polymers (LCP) containing 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid (HNA) were studied with H-1 NMR. A two- or three-parameter nematic director distribution in molten or nearly molten samples was obtained via rigorous simulation of wideline spectral lineshapes. This methodology was further employed to yield the chain director distribution in macroscopic sections derived from a frozen contraction flow. In addition, the dynamic conformation of polymer chains through the melting transition was monitored via lineshape analysis of samples having (bulk) isotropic director distributions. Extension of rigorous H-1 NMR spectral deconvolution to recently developed solid-state NMR imaging sequences is discussed. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RP Reimer, JA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Adv Mat, Berkeley, CA 94720 USA. EM reimer@garnet.berkeley.edu NR 49 TC 4 Z9 4 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD SEP PY 1998 VL 12 IS 2-3 BP 97 EP 112 DI 10.1016/S0926-2040(98)00056-3 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA 135LT UT WOS:000076803700004 PM 9809783 ER PT J AU Kurdi-Haidar, B Heath, D Lennon, G Howell, SB AF Kurdi-Haidar, B Heath, D Lennon, G Howell, SB TI Chromosomal localization and genomic structure of the human arsenite-stimulated ATPase (hASNA-I) SO SOMATIC CELL AND MOLECULAR GENETICS LA English DT Article ID METALLOTHIONEIN; DBP AB The hASNA-I is a novel human arsenite-stimulated ATPase identified as the human paralogue sf:the ATPase component of the arsenite efflux system in E. coli, The hASNA-I has distinct biochemical properties and a dual nuclear and cytoplasmic distribution. Immunohistochemical staining showed a distinct pattern of hASNA-I expression ir? cells within normal tissues, and its overexpression in breast cancel: Recently, the yeast two-hybrid system has identified hASNA-I as a cellular partner of metallothionein II suggesting an additional role in Zn homeostasis and cellular detoxification. This report describes the assignment of hASNA-I to human chromosome 19 by somatic-cell hybrid PCR mapping, the isolation of a chromosome 19-specific cosmid clone, and the genomic structure and exon-intron boundaries of hASNA-I. Our results indicate that the coding region of hASNA-I consists of 4 exons spanning 6 kb on band 19q13.3. These data will facilitate molecular analysis of the role of hASNA-I in human disease. C1 Univ Calif San Diego, Dept Med, La Jolla, CA 92093 USA. Univ Calif San Diego, Ctr Canc, La Jolla, CA 92093 USA. Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. RP Kurdi-Haidar, B (reprint author), Univ Calif San Diego, Dept Med, La Jolla, CA 92093 USA. FU NCI NIH HHS [R01 CA69004-01] NR 18 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0740-7750 J9 SOMAT CELL MOLEC GEN JI Somat.Cell Mol.Genet. PD SEP PY 1998 VL 24 IS 5 BP 307 EP 311 DI 10.1023/B:SCAM.0000007134.16744.8b PG 5 WC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity GA 269FR UT WOS:000084466500006 PM 10696239 ER PT J AU Sheffield, J AF Sheffield, J TI World population growth and the role of annual energy use per capita SO TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE LA English DT Article ID DEVELOPING-COUNTRIES; SUSTAINABILITY; DECLINE AB Is there a sustainable solution for the world and the resources it needs to maintain a decent standard of living for everybody, at a population very much higher than today's? Clearly, there cannot be both a permanent growth in the use of materials and a sustainable future. In this article, the focus is on the possible coupling of the annual energy use per capita and the population growth rate for each region; and the consequences of such a connection if the world's population is to stabilize. Energy is used as a factor because it is a proactive agent in facilitating increases in the standard of living and changes in the social conditions which are believed to influence the fertility rate. Historical trends and near-term projections for energy use and population growth rate are used to indicate a possible path in the future for developing regions. Improvements in the efficiency of energy use and modest cultural changes are invoked in an example projection of coupled energy use and population growth For each decade, the incremental increase in annual commercial energy use per capita and a corresponding decrease in population growth rate are chosen to continue the historical trends for developing regions of the world. This approach leads to population changes following closely the projections of the World Bank for the period up to 2150. The world energy use is projected to rise from about 9000 million tonnes of oil equivalent today to 15,000 to 21,000 Mtoe/a by the time the world's population has risen from 6 billion to around 12 billion people in the 22nd century. The energy demands of each developing region are compared with potential, indigenous energy sources to see whether each developing region might be able to cope with its increased energy demand, without massive energy imports. It seems that the availability of easily moveable, cheap fuels, requiring the use of all energy sources, will be important to allowing the developing world to make the transition to a stable population with a decent standard of living. (C) 1998 Elsevier Science Inc. C1 Oak Ridge Natl Lab, Energy Technol Program, Oak Ridge, TN 37831 USA. RP Sheffield, J (reprint author), Oak Ridge Natl Lab, Energy Technol Program, POB 2008, Oak Ridge, TN 37831 USA. NR 36 TC 16 Z9 16 U1 2 U2 23 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0040-1625 J9 TECHNOL FORECAST SOC JI Technol. Forecast. Soc. Chang. PD SEP PY 1998 VL 59 IS 1 BP 55 EP 87 DI 10.1016/S0040-1625(97)00071-1 PG 33 WC Business; Planning & Development SC Business & Economics; Public Administration GA 113AP UT WOS:000075527400006 PM 12294507 ER PT J AU Merdink, JL Gonzalez-Leon, A Bull, RJ Schultz, IR AF Merdink, JL Gonzalez-Leon, A Bull, RJ Schultz, IR TI The extent of dichloroacetate formation from trichloroethylene, chloral hydrate, trichloroacetate, and trichloroethanol in B6C3F1 mice SO TOXICOLOGICAL SCIENCES LA English DT Article ID SPECIES-DIFFERENCES; BIOLOGICAL SAMPLES; MOUSE-LIVER; METABOLISM; ACID; RATS; HEPATOCARCINOGENICITY; CARCINOGENICITY; KINETICS AB Conflicting data have been published related to the formation of dichloroacetate (DCA) from trichloroethylene (TRI), chloral hydrate (CH), or trichloroacetic acid (TCA) in B6C3F1 mice. TCA is usually indicated as the primary metabolic precursor to DCA. Model simulations based on the known pharmacokinetics of TCA and DCA predicted blood concentrations of DCA that were 10- to 100-fold lower than previously published reports. Because DCA has also been shown to form as an artifact during sample processing, we reevaluated the source of the reported DCA, i.e,, whether it was metabolically derived or formed as an artifact. Male B6C3F1 mice were dosed with TRI, CH, trichloroethanol (TCE), or TCA and metabolic profiles of each were determined. DCA was not detected in any of these samples above the assay LOQ of 1.9 mu M of whole blood. in order to slow the clearance of DCA, mice were pretreated for 2 weeks with 2 g/liter of DCA in their drinking water. Even under this pretreatment condition, no DCA was detected from a 100 mg/kg iv dose of TCA. Although there is significant uncertainty in the amount of DCA that could be generated from TRI or its metabolites, our experimental data and pharmacokinetic model simulations suggest that DCA is likely formed as a short-lived intermediate metabolite. However, its rapid elimination relative to its formation from TCA prevents the accumulation of measurable amounts of DCA in the blood. (C) 1998 Society of Toxicology. C1 Pacific NW Lab, Richland, WA 99352 USA. Washington State Univ, Grad Program Pharmacol Toxicol, Pullman, WA 99164 USA. RP Merdink, JL (reprint author), Pacific NW Lab, POB 999 P7-56, Richland, WA 99352 USA. NR 29 TC 35 Z9 35 U1 0 U2 3 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1096-6080 J9 TOXICOL SCI JI Toxicol. Sci. PD SEP PY 1998 VL 45 IS 1 BP 33 EP 41 DI 10.1093/toxsci/45.1.33 PG 9 WC Toxicology SC Toxicology GA 138VX UT WOS:000076995000004 PM 9848108 ER PT J AU Chan, PC Herbert, RA Roycroft, JH Haseman, JK Grumbein, SL Miller, RA Chou, BJ AF Chan, PC Herbert, RA Roycroft, JH Haseman, JK Grumbein, SL Miller, RA Chou, BJ TI Lung tumor induction by inhalation exposure to molybdenum trioxide in rats and mice SO TOXICOLOGICAL SCIENCES LA English DT Article AB Inhalation studies of molybdenum trioxide (MoO3) were conducted because of its wide use in industry, human exposure, and lack of data on carcinogenicity. Groups of 50 male and 50 female F344/N rats and B6C3F1 mice were exposed to MoO3 by inhalation at 0, 10, 30, or 100 mg/m(3), 6 h/day, 5 days/week, for 2 years. In both rats and mice, survival and mean body weights of exposed groups of males and females were similar to those of their respective controls. There were significant exposure-dependent increases in blood molybdenum concentration in exposed rats and mice. There were no toxicological differences in bone density or curvature between exposed animals and their respective controls. In rats, dose-dependent increases in incidence of hyaline degeneration in the nasal olfactory epithelium and squamous metaplasia of the epithelium lining the base of the epiglottis were observed. The incidence of alveolar/bronchiolar adenoma or carcinoma (combined) was marginally increased in males but not in females compared with controls. In mice, the incidences of squamous metaplasia of the epithelium lining the base of the epiglottis, hyperplasia of the laryngeal epithelium, and metaplasia of the alveolar epithelium were significantly increased in all exposed males and females compared with controls. The incidence of alveolar/bronchiolar adenoma or carcinoma (combined) in exposed groups of males and females was significantly greater than that in the control groups. (C) 1998 Society of Toxicology. C1 NIEHS, Res Triangle Pk, NC 27709 USA. Pacific NW Lab, Richland, WA 99352 USA. RP Chan, PC (reprint author), NIEHS, POB 12233, Res Triangle Pk, NC 27709 USA. NR 19 TC 11 Z9 12 U1 1 U2 5 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1096-6080 J9 TOXICOL SCI JI Toxicol. Sci. PD SEP PY 1998 VL 45 IS 1 BP 58 EP 65 DI 10.1093/toxsci/45.1.58 PG 8 WC Toxicology SC Toxicology GA 138VX UT WOS:000076995000007 PM 9848111 ER PT J AU Russo, RE Mao, XL Borisov, OV AF Russo, RE Mao, XL Borisov, OV TI Laser ablation sampling SO TRAC-TRENDS IN ANALYTICAL CHEMISTRY LA English DT Review DE laser ablation sampling; solid sample introduction; ICP-MS; ICP-AES; sampling using laser ablation ID INDUCTIVELY-COUPLED PLASMA; ATOMIC-EMISSION-SPECTROMETRY; LA-ICP-MS; STRESS POWER MEASUREMENTS; RARE-EARTH ELEMENTS; GAS-FLOW RATE; MASS-SPECTROMETRY; SOLID SAMPLES; QUANTITATIVE-ANALYSIS; GEOLOGICAL-MATERIALS AB Laser ablation sampling provides significant benefits and capabilities for chemical analysis. It represents one of the most promising technologies for direct solid sample introduction. Despite the advantages, there are a number of issues that should be addressed to better understand and utilize this technology. baser ablation itself is a complex process and is poorly understood, fundamentally. In this paper, we describe the current achievements and limitations in order to better understand and utilize laser ablation sampling for chemical analysis. Several current issues related to laser ablation sampling are discussed, including calibration and optimization, fractionation, sensitivity enhancements, mass loading, and particle transport. Published by Elsevier Science B.V. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Russo, RE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 115 TC 76 Z9 79 U1 3 U2 39 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-9936 J9 TRAC-TREND ANAL CHEM JI Trac-Trends Anal. Chem. PD SEP-OCT PY 1998 VL 17 IS 8-9 BP 461 EP 469 DI 10.1016/S0165-9936(98)00047-8 PG 9 WC Chemistry, Analytical SC Chemistry GA 121UE UT WOS:000076031700011 ER PT J AU Vo-Dinh, T AF Vo-Dinh, T TI Surface-enhanced Raman spectroscopy using metallic nanostructures SO TRAC-TRENDS IN ANALYTICAL CHEMISTRY LA English DT Review DE surface-enhanced Raman scattering; remote sensor; single molecule; near field; in situ analysis; biomedical diagnostics; human immunodeficiency virus ID FLOW-INJECTION ANALYSIS; SILVER-COATED ALUMINA; P-AMINOBENZOIC ACID; SCATTERING SPECTROMETRY; ELECTROMAGNETIC THEORY; QUANTITATIVE DETECTION; CHARGE-TRANSFER; ISLAND FILMS; GOLD SOLS; PYRIDINE AB This article provides an overview of the development and application of the surface-enhanced Raman scattering (SERS) techniques using metal-coated nanostructures on solid substrates, An introduction to theoretical principles of the SERS effect and the different SERS-active media is presented. The focus is on nanostructured solid substrates and their practical applications in chemical, environmental and biomedical areas. Specific examples of analytical techniques, instruments and sensors developed in the author's laboratory will be discussed to illustrate the usefulness and potential of the SERS techniques. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Life Sci, Adv Monitoring Dev Grp, Oak Ridge, TN 37831 USA. RP Vo-Dinh, T (reprint author), Oak Ridge Natl Lab, Div Life Sci, Adv Monitoring Dev Grp, Oak Ridge, TN 37831 USA. NR 139 TC 329 Z9 338 U1 11 U2 145 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-9936 J9 TRAC-TREND ANAL CHEM JI Trac-Trends Anal. Chem. PD SEP-OCT PY 1998 VL 17 IS 8-9 BP 557 EP 582 DI 10.1016/S0165-9936(98)00069-7 PG 26 WC Chemistry, Analytical SC Chemistry GA 121UE UT WOS:000076031700021 ER PT J AU Ping, Y Engler, O Gottstein, G AF Ping, Y Engler, O Gottstein, G TI Formation of recrystallization texture with rolling orientation in Al-1.3%Mn alloy SO TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA LA English DT Article DE recrystallization; texture; AlMn; ODF ID ALUMINUM-IRON-ALLOYS; DEFORMATION; CRYSTALS AB The formation of recrystallization texture with rolling orientation (e g the R texture) and its influencing factors in a pure Al-1.3 % Mn alloy were investigated by means of X-ray texture analysis and particularly local orientation measurements based on EBSD in SEM and MEED in TEM. The results show that this texture component is caused by the grains formed at grain boundaries through SIBM mechanism and its formation is favored by Mn atoms in solution, large initial grain size and low annealing temperature. The grains formed in this way are mainly B/R oriented and their growth is inferior to that of cube grains. The reason for the formation of such texture component is attributed to the differences in misorientations of different matrices, the deformation behavior relates to initial grain size and the Mn atoms in solution. C1 Univ Sci & Technol Beijing, Dept Mat Sci & Engn, Beijing 100083, Peoples R China. Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. Rhein Westfal TH Aachen, Inst Met Kunde & Met Phys, D-52056 Aachen, Germany. NR 22 TC 4 Z9 5 U1 0 U2 2 PU ALLERTON PRESS INC PI NEW YORK PA 150 FIFTH AVE, NEW YORK, NY 10011 USA SN 1003-6326 J9 T NONFERR METAL SOC JI Trans. Nonferrous Met. Soc. China PD SEP PY 1998 VL 8 IS 3 BP 363 EP 372 PG 10 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 121TW UT WOS:000076030900002 ER PT J AU Henke, KR AF Henke, KR TI Chemistry of heavy metal precipitates resulting from reactions with Thio-Red (R) SO WATER ENVIRONMENT RESEARCH LA English DT Article DE water treatment; heavy metal; Thio-Red (R); thiocarbonate; metal sulfides; carbon disulfide AB Thio-Red(R) is a commercial product that is widely used to precipitate divalent heavy metal contaminants from water. To gain a better understanding of how Thio-Red(R) reacts with dissolved divalent metals, the product was added to laboratory aqueous solutions, each of which contained one of several dissolved copper, lead, mercury, and zinc compounds. In all of the solutions, precipitates rapidly formed after adding Thio-Red(R). X-ray diffraction analyses of the precipitates detected ordinary metal sulfides rather than metal thiocarbonates. Further investigations identified reactions that may be responsible for the formation of the precipitates. C1 Univ N Dakota, Dept Geol & Geol Engn, Grand Forks, ND 58201 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Henke, KR (reprint author), Univ Kentucky, Dept Chem, Chem Phys Bldg, Lexington, KY 40506 USA. NR 19 TC 17 Z9 17 U1 1 U2 4 PU WATER ENVIRONMENT FEDERATION PI ALEXANDRIA PA 601 WYTHE ST, ALEXANDRIA, VA 22314-1994 USA SN 1061-4303 J9 WATER ENVIRON RES JI Water Environ. Res. PD SEP-OCT PY 1998 VL 70 IS 6 BP 1178 EP 1185 DI 10.2175/106143098X123516 PG 8 WC Engineering, Environmental; Environmental Sciences; Limnology; Water Resources SC Engineering; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA 125PT UT WOS:000076246700009 ER PT J AU Pan, LH Wu, LS AF Pan, LH Wu, LS TI A hybrid global optimization method for inverse estimation of hydraulic parameters: Annealing-simplex method SO WATER RESOURCES RESEARCH LA English DT Article ID ONE-DIMENSIONAL INFILTRATION; FLOW; SOILS; CONDUCTIVITY; EQUATION AB Inverse estimation of unsaturated hydraulic parameters is often a highly nonlinear optimization problem with multiple parameters. The objective functions involved are often topographically complex and may contain many local minima. Because of these reasons, the inverse solutions are commonly very sensitive to the initial guess of the parameters when conventional optimizers are used. This paper presents an annealing-simplex method that incorporates simulated annealing strategies into a classical downhill simplex method. An upward infiltration experiment was used as an example of inverse estimation to test the method. Numerical experiments of both minimizing an algebraic function and inversion of upward infiltration data showed that the new method successfully converged to the global minimum En all cases, irrespective of the initial hydraulic parameter estimates, while the classical downhill method often converged to unfavorable local minima. The CPU times needed for the annealing-simplex method to estimate 5 and 7 hydraulic parameters simultaneously are about a half hour and 1 hour on a PC, respectively. Additionally, no special requirements are imposed on the objective function, and the method is independent of the details of the simulation submodel. Therefore the proposed method should be applicable to other optimization problems in water resources when it is important to have a robust global search capability. C1 Univ Calif Riverside, Dept Soil & Environm Sci, Riverside, CA 92521 USA. RP Pan, LH (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, 90-1116,1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Pan, Lehua/G-2439-2015 NR 24 TC 46 Z9 52 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD SEP PY 1998 VL 34 IS 9 BP 2261 EP 2269 DI 10.1029/98WR01672 PG 9 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA 115PX UT WOS:000075674800014 ER PT J AU Fluckiger, JJ AF Fluckiger, JJ TI A single standard for welding qualification stands ready to use SO WELDING JOURNAL LA English DT Article C1 Lockheed Martin Idaho Technol Co, Qual Engn & Assurance, Idaho Falls, ID USA. RP Fluckiger, JJ (reprint author), Lockheed Martin Idaho Technol Co, Qual Engn & Assurance, Idaho Falls, ID USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 USA SN 0043-2296 J9 WELD J JI Weld. J. PD SEP PY 1998 VL 77 IS 9 BP 59 EP 60 PG 2 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 116QW UT WOS:000075736900012 ER PT J AU McLeod, KW Ciravolo, TG AF McLeod, KW Ciravolo, TG TI Boron tolerance and potential boron removal by bottomland tree seedlings SO WETLANDS LA English DT Article DE boron; remediation; elemental concentration; biomass; Betula nigra; Nyssa sylvatica var. biflora; Nyssa aquatica; Platanus occidentalis; Taxodium distichum; Quercus alba; Quercus falcata var. pagodaefolia; Quercus nigra; Quercus michauxii; Quercus phellos ID TOXICITY; DEFICIENCY; CHEMISTRY AB Boron is present in many household, industrial, and municipal products and by-products. Uncontrolled release of boron-containing materials into wetland environments could cause toxicity in bottom-land and swamp tree species. To test this hypothesis, boron was added to 10-liter pots containing seedlings of Betula nigra, Nyssa sylvatica var. biflora, Nyssa aquatica, Platanus occidentalis, Taxodium distichum, Quercus alba, Q. falcata var. pagodaefolia, Q. nigra, Q. michauxii, and Q. phellos at rates of 0, 2, 4, 8, and 16 mg/L, and the seedlings grown for four months. Elemental leaf concentrations, growth, and biomass were determined. Boron concentration in leaves was linearly related to boron addition. The highest boron treatment significantly decreased growth for B. nigra, N. aquatica, P. occidentalis, and T. distichum. Platanus occidentalis had the highest boron recovery (23% at 4 mg/L), while T. distichum had the most consistent recovery (11-13%) over all treatments. Although leaf damage was severe in the oaks, there were no significant differences in growth parameters between the control and boron treatments. This is attributed to the determinate growth of the oaks and possibly the short duration of the study. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP McLeod, KW (reprint author), Univ Georgia, Savannah River Ecol Lab, PO Drawer E, Aiken, SC 29802 USA. NR 18 TC 5 Z9 6 U1 0 U2 2 PU SOC WETLAND SCIENTISTS PI LAWRENCE PA 810 E TENTH ST, P O BOX 1897, LAWRENCE, KS 66044 USA SN 0277-5212 J9 WETLANDS JI Wetlands PD SEP PY 1998 VL 18 IS 3 BP 431 EP 436 PG 6 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA 123TF UT WOS:000076139900010 ER PT J AU Plohr, BJ Sharp, DH AF Plohr, BJ Sharp, DH TI Instability of accelerated elastic metal plates SO ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK LA English DT Article DE Rayleigh-Taylor instability; shear strength ID RAYLEIGH-TAYLOR INSTABILITY; PLASTIC SOLIDS AB When subjected to rapid acceleration, a metal plate that is not perfectly hat displays a type of Rayleigh-Taylor instability, which is affected by shear strength. We investigate the initial stage of this instability assuming that the deviation from flatness is small and the pressure producing the acceleration is moderate. Under these assumptions, the plate can be modeled as elastic and incompressible, and the linearized form of the governing are valid. We derive a linear initial/boundary-value problem that models the flow and obtain analytical formulae for the solutions. Our solutions exhibit vorticity inside the plate, an important feature caused by shear strength that was omitted in previous solutions. The theoretical relationship between the acceleration and the critical perturbation wave length, beyond which the flow is unstable, agrees quantitatively with results of numerical simulations and experiments. C1 SUNY Stony Brook, Dept Math, Stony Brook, NY 11794 USA. SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Plohr, BJ (reprint author), SUNY Stony Brook, Dept Math, Stony Brook, NY 11794 USA. NR 14 TC 22 Z9 22 U1 1 U2 1 PU BIRKHAUSER VERLAG AG PI BASEL PA VIADUKSTRASSE 40-44, PO BOX 133, CH-4010 BASEL, SWITZERLAND SN 0044-2275 J9 Z ANGEW MATH PHYS JI Z. Angew. Math. Phys. PD SEP PY 1998 VL 49 IS 5 BP 786 EP 804 DI 10.1007/s000330050121 PG 19 WC Mathematics, Applied SC Mathematics GA 129NM UT WOS:000076469900006 ER PT J AU de Arellano-Lopez, AR Smirnov, BI Goretta, KC Routbort, JL AF de Arellano-Lopez, AR Smirnov, BI Goretta, KC Routbort, JL TI Creep of an Al2O3-SiC(whisker)-TiC(particle) composite SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article DE ceramic-matrix composites; compressive creep; electrodischarge machining ID MATRIX COMPOSITES; DEFORMATION; MECHANISMS; CERAMICS; ALUMINA AB Compressive creep of an electrodischarge-machinable composite, Al2O3/30.9 vol.% SiC-whiskers/23 vol.% TiC-particles, was studied at 1350-1458 degrees C in inert atmospheres. The microstructure of the deformed specimens was analyzed by scanning and transmission electron microscopy. At stresses below 80 MPa, partially unaccommodated grain-boundary sliding was the rate-controlling mechanism for creep, with a stress exponent of approximately 1 and an activation energy of approximately 470 kJ mol(-1). Damage accumulated at stresses above 80 MPa as a consequence of the insufficient diffusional transport of matter. This damage was responsible for an increased stress exponent. (C) 1998 Elsevier Science S.A. All rights reserved. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. Univ Sevilla, Dept Fis Mat Condensada, E-41080 Seville, Spain. Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia. RP Routbort, JL (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. EM routbort@anl.gov OI R. de Arellano Lopez, Antonio/0000-0002-7443-0244 NR 21 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD AUG 31 PY 1998 VL 252 IS 1 BP 93 EP 97 DI 10.1016/S0921-5093(98)00654-6 PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 108HV UT WOS:000075261000011 ER PT J AU Sahni, V Habib, S AF Sahni, V Habib, S TI Does inflationary particle production suggest Omega(m)< 1? SO PHYSICAL REVIEW LETTERS LA English DT Article ID ROBERTSON-WALKER UNIVERSES; QUANTUM FIELD-THEORY; DENSITY; FLUCTUATIONS; GRAVITY; MODELS; ORIGIN AB We study a class of Friedmann-Robertson-Walker spacetimes with a nonminimally coupled light massive scalar held. Values of the coupling parameter xi < 0 enhance long range power in the vacuum expectation value of the energy-momentum tensor [T-mu v] and fundamentally alter the nature of inflationary particle production: the energy density of created particles behaves like an effective cosmological constant, leading generically to Omega(m) < 1 in clustered matter and providing a possible resolution of the "Omega problem" for low density cosmological models. C1 Interuniv Ctr Astron & Astrophys, Poona 411007, Maharashtra, India. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Sahni, V (reprint author), Interuniv Ctr Astron & Astrophys, Post Bag 4, Poona 411007, Maharashtra, India. RI Sahni, Varun/H-3336-2012 NR 25 TC 107 Z9 107 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 AUG 31 PY 1998 VL 81 IS 9 BP 1766 EP 1769 DI 10.1103/PhysRevLett.81.1766 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300005 ER PT J AU Athanassopoulos, C Auerbach, LB Burman, RL Caldwell, DO Church, ED Cohen, I Donahue, JB Fazely, A Federspiel, FJ Garvey, GT Gunasingha, RM Imlay, R Johnston, K Kim, HJ Louis, WC Majkic, R McIlhany, K Milis, GB Reeder, RA Sandberg, V Smith, D Stancu, I Strossman, W Tayloe, R VanDalen, GJ Vernon, W Wadia, N Waltz, J White, DH Works, D Xiao, Y Yellin, S AF Athanassopoulos, C Auerbach, LB Burman, RL Caldwell, DO Church, ED Cohen, I Donahue, JB Fazely, A Federspiel, FJ Garvey, GT Gunasingha, RM Imlay, R Johnston, K Kim, HJ Louis, WC Majkic, R McIlhany, K Milis, GB Reeder, RA Sandberg, V Smith, D Stancu, I Strossman, W Tayloe, R VanDalen, GJ Vernon, W Wadia, N Waltz, J White, DH Works, D Xiao, Y Yellin, S TI Results on upsilon(mu) -> upsilon(e) neutrino oscillations from the LSND experiment SO PHYSICAL REVIEW LETTERS LA English DT Article ID RANDOM-PHASE-APPROXIMATION; DETECTOR AB A search for nu(mu) - nu(e) oscillations has been conducted with the LSND apparatus using v(mu) from pi(+) decay in flight. Two analyses observe a total of 40 beam-on high-energy (60-200 MeV) electron events consistent with the nu(e) C --> e(-) X inclusive reaction. This number is significantly above the 21.9 +/- 2.1 events expected from the nu(e) contamination in the beam and the beam-off background. If interpreted as an oscillation signal, the observed oscillation probability of (2.6 +/- 1.0 +/- 0.5) x 10(-3) is consistent with the previously reported <(nu)over bar>(mu) --> <(nu)over bar>(e) oscillation evidence from LSND. C1 Temple Univ, Philadelphia, PA 19122 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, San Diego, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Embry Riddle Aeronaut Univ, Prescott, AZ 86301 USA. Linfield Coll, McMinnville, OR 97128 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Louisiana State Univ, Baton Rouge, LA 70803 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ New Mexico, Albuquerque, NM 87131 USA. So Univ, Baton Rouge, LA 70813 USA. RP Athanassopoulos, C (reprint author), Temple Univ, Philadelphia, PA 19122 USA. NR 11 TC 631 Z9 630 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 AUG 31 PY 1998 VL 81 IS 9 BP 1774 EP 1777 DI 10.1103/PhysRevLett.81.1774 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300007 ER PT J AU Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Kwon, Y Lyon, AL Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patton, S Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H AF Browder, TE Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Kotov, S Kravchenko, I Kwak, N Zhou, L Anderson, S Kubota, Y Lee, SJ O'Neill, JJ Poling, R Riehle, T Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Timm, S Wappler, F Anastassov, A Duboscq, JE Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Severini, H Skubic, P Bishai, M Fast, J Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Glenn, S Kwon, Y Lyon, AL Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Azfar, F Efimov, A Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Xing, X Bartelt, J Csorna, SE Jain, V McLean, KW Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Chadha, M Chan, S Eigen, G Miller, JS Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Bliss, DW Masek, G Paar, HP Prell, S Sharma, V Asner, DM Gronberg, J Hill, TS Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Roberts, D Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Bloom, K Boisvert, V Cassel, DG Crowcroft, DS Dickson, M von Dombrowski, S Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Patton, S Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Ershov, A Gao, YS Kim, DYJ Wilson, R Yamamoto, H CA CLEO Collaboration TI Observation of high momentum eta(l) production in B decays SO PHYSICAL REVIEW LETTERS LA English DT Article ID CP VIOLATION; MESONS AB We report the first observation of B --> eta'X transitions with high momentum eta' mesons. We observe 39.0 +/- 11.6 B decay events with 2.0 < p(eta') < 2.7 GeV/c, the high momentum region where background from b --> c processes is suppressed. We discuss the physical interpretation of the signal, including the possibility that it is due to b sg transitions. Given that interpretation, we find B(B --> eta'X-s) = [6.2 +/- 1.6(stat) +/- 1.3(syst)(-1.5)(+0.0)(bkg)] x 10(-4) for 2.0 < p(eta') < 2.7 GeV/c. C1 Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Montreal, PQ, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. RP Browder, TE (reprint author), Univ Hawaii Manoa, Honolulu, HI 96822 USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 20 TC 58 Z9 58 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1786 EP 1790 DI 10.1103/PhysRevLett.81.1786 PG 5 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300010 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azzi-Bacchetta, P Bacchetta, N Bagdasarov, S Bailey, MW de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Brunetti, R Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chiou, CN Chlebana, F Christofek, L Chu, ML Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Costanzo, D Couyoumtzelis, C Cronin-Hennessy, D Culbertson, R Dagenhart, D Daniels, T DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Frisch, H Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gold, M Gordon, A Goshaw, AT Gotra, Y Goulianos, K Groer, L Grosso-Pilcher, C Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hauser, J Hayashi, E Heinrich, J Hao, W Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Huang, Z Huffman, BT Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Joshi, U Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kestenbaum, D Khazins, D Kikuchi, T Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kowald, W Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kurino, K Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martignom, G Martin, A Matthews, JAJ Mazzanti, P McFarland, K McIntyre, P Melese, P Menguzzato, M Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Miyashita, S Moggi, N Moore, E Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Musy, M Nakada, H Nakano, I Nakaya, T Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pompos, A Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reischl, M Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Shah, T Shapiro, MD Shaw, NM Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strohmer, R Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, J Suzuki, T Takahashi, T Takano, T Takashima, R Takikawa, K Tanaka, M Tannenbaum, B Tartarelli, F Taylor, W Tecchio, M Teng, PK Teramoto, Y Terashi, K Tether, S Theriot, D Thomas, TL Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Ukegawa, F Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Warburton, A Watanabe, T Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Zanetti, A Zetti, F Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amadon, A Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azzi-Bacchetta, P Bacchetta, N Bagdasarov, S Bailey, MW de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bettelli, S Bevensee, B Bhatti, A Biery, K Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Blusk, S Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Brunetti, R Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chertok, M Chiarelli, G Chiou, CN Chlebana, F Christofek, L Chu, ML Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Costanzo, D Couyoumtzelis, C Cronin-Hennessy, D Culbertson, R Dagenhart, D Daniels, T DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Feng, Z Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Frisch, H Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gold, M Gordon, A Goshaw, AT Gotra, Y Goulianos, K Groer, L Grosso-Pilcher, C Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handa, T Handler, R Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hauser, J Hayashi, E Heinrich, J Hao, W Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Huang, Z Huffman, BT Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Joshi, U Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kestenbaum, D Khazins, D Kikuchi, T Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kowald, W Kroll, J Kruse, M Kuhlmann, SE Kuns, E Kurino, K Kuwabara, T Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M Lanzoni, M Latino, G LeCompte, T Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maksimovic, P Mangano, M Mariotti, M Marriner, JP Martignom, G Martin, A Matthews, JAJ Mazzanti, P McFarland, K McIntyre, P Melese, P Menguzzato, M Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Miyashita, S Moggi, N Moore, E Morita, Y Mukherjee, A Muller, T Murat, P Murgia, S Musy, M Nakada, H Nakano, I Nakaya, T Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pompos, A Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reischl, M Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semeria, F Shah, T Shapiro, MD Shaw, NM Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Sliwa, K Smith, C Snider, FD Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strohmer, R Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, J Suzuki, T Takahashi, T Takano, T Takashima, R Takikawa, K Tanaka, M Tannenbaum, B Tartarelli, F Taylor, W Tecchio, M Teng, PK Teramoto, Y Terashi, K Tether, S Theriot, D Thomas, TL Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Ukegawa, F Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Warburton, A Watanabe, T Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Zanetti, A Zetti, F Zucchelli, S CA CDF Collaboration TI Searches for new physics in diphoton events in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID MEDIATED SUPERSYMMETRY-BREAKING; TOP-QUARK PRODUCTION; FERMILAB TEVATRON; (P)OVER-BAR-P COLLISIONS; ENERGY; DETECTOR; COLLIDER; MODEL AB We have searched for anomalous production of missing E-T ((E) over bar(T)), jets, leptons (e, mu, tau), b quarks, or additional photons in events containing two isolated, central (\eta\ < 1.0) photons with E-T > 12 GeV. The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-E-T electromagnetic cluster, and large (E) over bar(T). We set limits using two specific supersymmetry scenarios for production of diphoton events with (E) over bar(T). C1 Natl Lab High Energy Phys, KEK, Tsukuba, Ibaraki 305, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Chicago, Chicago, IL 60637 USA. Duke Univ, Durham, NC 27708 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 32611 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ New Mexico, Albuquerque, NM 87131 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Rockefeller Univ, New York, NY 10021 USA. Rutgers State Univ, Piscataway, NJ 08855 USA. Acad Sinica, Taipei 11530, Taiwan. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 315, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Abe, F (reprint author), Natl Lab High Energy Phys, KEK, Tsukuba, Ibaraki 305, Japan. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Peters, Michael/B-4973-2009; Nomerotski, Andrei/A-5169-2010; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Paulini, Manfred/N-7794-2014; Introzzi, Gianluca/K-2497-2015; vilar, rocio/D-7454-2014 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787; Introzzi, Gianluca/0000-0002-1314-2580; NR 36 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1791 EP 1796 DI 10.1103/PhysRevLett.81.1791 PG 6 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300011 ER PT J AU Emel'yanov, V Khodinov, A Klein, SR Vogt, R AF Emel'yanov, V Khodinov, A Klein, SR Vogt, R TI Spatial variation of nuclear structure functions and heavy quark production SO PHYSICAL REVIEW LETTERS LA English DT Article ID PB-PB INTERACTIONS; ION COLLISIONS; 158 GEV/C; DEPENDENCE; J/PSI AB We explore how nuclear modifications to the free nucleon structure functions (also known as shadowing) affect heavy quark production in collisions at different impact parameters. We assume that the nuclear modifications arise from a density dependent effect such as gluon recombination and are thus proportional to the local density. We calculate the dependence of charm and bottom quark production on impact parameter and show that density dependent modifications can lead to significant reductions in the heavy quark production cross sections in central relative to peripheral interactions. C1 Tech Univ, Moscow State Engn Phys Inst, Moscow 115409, Russia. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RP Emel'yanov, V (reprint author), Tech Univ, Moscow State Engn Phys Inst, Kashirskoe Ave 31, Moscow 115409, Russia. RI KHODINOV, ALEKSANDR/D-6269-2015 OI KHODINOV, ALEKSANDR/0000-0003-3551-5808 NR 21 TC 30 Z9 30 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1801 EP 1804 DI 10.1103/PhysRevLett.81.1801 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300013 ER PT J AU Niculescu, G Mohring, RM Gueye, P Abbott, D Ahmidouch, A Amatuni, TA Ambrozewicz, P Angelescu, T Armstrong, CS Assamagan, K Avery, S Bailey, K Baker, OK Beard, K Beedoe, S Beise, E Breuer, H Carlini, R Cha, J Chang, CC Chant, N Cisbani, E Collins, G Cummings, W Danagoulian, S De Leo, R Duncan, F Dunne, J Dutta, D Eden, T Ent, R Eyraud, L Ewell, L Finn, M Fortune, T Frolov, V Frullani, S Furget, C Garibaldi, F Gaskell, D Geesaman, DF Gustafsson, KK Hansen, JO Harvey, M Hinton, W Hungerford, E Iodice, M Jackson, C Keppel, C Kim, W Kino, K Koltenuk, D Kox, S Kramer, L Leone, T Lolos, G Lung, A Mack, D Madey, R Maeda, M Majewski, S Markowitz, P Martoff, CJ Meekins, D Mihul, A Mitchell, J Mkrtchyan, H Mtingwa, S Niculescu, I Perrino, R Potterveld, D Price, JW Raue, BA Real, JS Reinhold, J Roos, P Saito, T Savage, G Sawafta, R Segel, R Stepanyan, S Stoler, P Tadevosian, V Tang, L Teodorescu, L Terasawa, T Tsubota, H Urciuoli, GM Volmer, J Vulcan, W Welch, P Williams, R Wood, S Yan, C Zeidman, B AF Niculescu, G Mohring, RM Gueye, P Abbott, D Ahmidouch, A Amatuni, TA Ambrozewicz, P Angelescu, T Armstrong, CS Assamagan, K Avery, S Bailey, K Baker, OK Beard, K Beedoe, S Beise, E Breuer, H Carlini, R Cha, J Chang, CC Chant, N Cisbani, E Collins, G Cummings, W Danagoulian, S De Leo, R Duncan, F Dunne, J Dutta, D Eden, T Ent, R Eyraud, L Ewell, L Finn, M Fortune, T Frolov, V Frullani, S Furget, C Garibaldi, F Gaskell, D Geesaman, DF Gustafsson, KK Hansen, JO Harvey, M Hinton, W Hungerford, E Iodice, M Jackson, C Keppel, C Kim, W Kino, K Koltenuk, D Kox, S Kramer, L Leone, T Lolos, G Lung, A Mack, D Madey, R Maeda, M Majewski, S Markowitz, P Martoff, CJ Meekins, D Mihul, A Mitchell, J Mkrtchyan, H Mtingwa, S Niculescu, I Perrino, R Potterveld, D Price, JW Raue, BA Real, JS Reinhold, J Roos, P Saito, T Savage, G Sawafta, R Segel, R Stepanyan, S Stoler, P Tadevosian, V Tang, L Teodorescu, L Terasawa, T Tsubota, H Urciuoli, GM Volmer, J Vulcan, W Welch, P Williams, R Wood, S Yan, C Zeidman, B TI Longitudinal and transverse cross sections in the H-1(e, e ' K+)Lambda reaction SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTROMAGNETIC PRODUCTION; KAON PHOTOPRODUCTION; ELECTROPRODUCTION; STRANGENESS; NUCLEONS; MODEL AB The H-1(e, e'K+)Lambda reaction was studied as a function of the squared four-momentum transfer, Q(2), and the virtual photon polarization, epsilon. For each of four Q(2) settings, 0.52, 0.75, 1.00, and 2.00 (GeV/c)(2), the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The Q(2) dependence of the sigma(L)/sigma(T) ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations. C1 Hampton Univ, Hampton, VA 23668 USA. Univ Maryland, College Pk, MD 20742 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Kent State Univ, Kent, OH 44242 USA. Yerevan Phys Inst, Yerevan 375306, Armenia. Temple Univ, Philadelphia, PA 19122 USA. Univ Bucharest, R-76900 Bucharest, Romania. Coll William & Mary, Williamsburg, VA 23187 USA. Argonne Natl Lab, Argonne, IL 60439 USA. N Carolina Agr & Technol State Univ, Greensboro, NC 27411 USA. Free Univ Amsterdam, NL-1081 Amsterdam, Netherlands. Ist Super Sanita, Phys Lab, I-00161 Rome, Italy. Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy. Northwestern Univ, Evanston, IL 60201 USA. ISN, F-38026 Grenoble, France. Univ Penn, Philadelphia, PA 19104 USA. Rensselaer Polytech Inst, Troy, NY 12180 USA. Oregon State Univ, Corvallis, OR 97331 USA. Univ Houston, Houston, TX 77204 USA. Kyungpook Natl Univ, Taegu 702701, South Korea. Tohoku Univ, Sendai, Miyagi 982, Japan. Florida Int Univ, Miami, FL 33199 USA. RP Niculescu, G (reprint author), Hampton Univ, Hampton, VA 23668 USA. RI Perrino, Roberto/B-4633-2010; kino, koichi/D-6173-2012; Cisbani, Evaristo/C-9249-2011 OI Perrino, Roberto/0000-0002-5764-7337; Cisbani, Evaristo/0000-0002-6774-8473 NR 16 TC 49 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 AUG 31 PY 1998 VL 81 IS 9 BP 1805 EP 1808 DI 10.1103/PhysRevLett.81.1805 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300014 ER PT J AU Enachescu, M van den Oetelaar, RJA Carpick, RW Ogletree, DF Flipse, CFJ Salmeron, M AF Enachescu, M van den Oetelaar, RJA Carpick, RW Ogletree, DF Flipse, CFJ Salmeron, M TI Atomic force microscopy study of an ideally hard contact: The diamond(111) tungsten carbide interface SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCALE FRICTION; QUANTITATIVE-ANALYSIS; SOLID MATERIALS; ELASTIC SPHERE; RIGID PLANE; LOW LOADS; SURFACE; ADHESION; STICKING; TIP AB A comprehensive nanotribological study of a hydrogen-terminated diamond(lll)/tungsten carbide interface has been performed using ultrahigh vacuum atomic force microscopy. Both contact conductance, which is proportional to contact area, and friction have been measured as a function of applied load. We demonstrate for the first time that the load dependence of the contact area in UHV for this extremely hard single asperity contact is described by the Derjaguin-Muller-Toporov continuum mechanics model. Furthermore, the frictional force is found to be directly proportional to the contact area. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Bucharest, Dept Phys, Bucharest, Romania. RP Salmeron, M (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Enachescu, Marius/C-4963-2011; Ogletree, D Frank/D-9833-2016 OI Ogletree, D Frank/0000-0002-8159-0182 NR 30 TC 125 Z9 126 U1 4 U2 24 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1877 EP 1880 DI 10.1103/PhysRevLett.81.1877 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300032 ER PT J AU Backhaus, S Packard, RE AF Backhaus, S Packard, RE TI Shot noise acoustic radiation generated by phase slippage in superfluid He-4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUBMICRON APERTURES; CRITICAL VELOCITIES; OSCILLATING FLOW; STEADY AB We present a model calculation and measurements of the acoustic radiation spectrum generated by thermally activated phase slippage driven by a constant pressure head. The calculation of the spectrum, which is similar to that for shot noise in an electrical current, takes into account the stochastic nature of phase-slip vortex nucleation. The observed acoustic amplitude depends on the driving pressure Delta P, the frequency omega, and the quality factor Q of a coupled cavity, as (Delta PQ/omega(5))(1/2), consistent with the model predictions. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Backhaus, S (reprint author), Univ Calif Los Alamos Natl Lab, MS K764, Los Alamos, NM 87545 USA. RI Backhaus, Scott/F-4285-2012 NR 18 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1893 EP 1896 DI 10.1103/PhysRevLett.81.1893 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300036 ER PT J AU Tober, ED Farrow, RFC Marks, RF Witte, G Kalki, K Chambliss, DD AF Tober, ED Farrow, RFC Marks, RF Witte, G Kalki, K Chambliss, DD TI Self-assembled lateral multilayers from thin film alloys of immiscible metals SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE; MAGNETORESISTANCE; MAGNETISM; SYSTEMS; GROWTH AB Thin films consisting of alloys of immiscible metals display a unique form of compositional ordering not observed in the bulk. Utilizing scanning tunneling microscopy and low energy electron diffraction, we have examined thin films of CoetaAg1-eta and FeetaAg1-eta grown on Mo(110) surfaces. Both of these systems are observed to form a compositionally ordered alloy of alternating, contiguous stripes of Co (or Fe) and Ag with the long axis of the stripe coinciding with the Mo[001] direction in the plane of the substrate. The average stripe periodicities are on the order of 2.0 to 2.5 nm along the Mo[<(1)over bar 10>] (perpendicular to the stripes) direction depending on film stoichiometry. C1 IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. Ruhr Univ Bochum, Lehrstuhl Phys Chem 1, D-44801 Bochum, Germany. RP Tober, ED (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. NR 14 TC 42 Z9 42 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1897 EP 1900 DI 10.1103/PhysRevLett.81.1897 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300037 ER PT J AU Bartelt, MC Schmid, AK Evans, JW Hwang, RQ AF Bartelt, MC Schmid, AK Evans, JW Hwang, RQ TI Island size and environment dependence of adatom capture: Cu/Co islands on Ru(0001) SO PHYSICAL REVIEW LETTERS LA English DT Article ID GROWTH; EPITAXY; NUCLEATION; DEPOSITION; METAL AB We quantify the rate of capture by Co islands on Ru(0001) of additionally deposited Cu atoms, using scanning tunneling microscopy. The dependence of the capture rates on Go-island size is shown to reflect larger island-free areas surrounding bigger islands, a feature neglected in mean-field treatments. We also find a strong direction dependence in Cu adatom capture, reflecting the local environment of individual islands. These features are elucidated by simulations and diffusion equation analyses. C1 Sandia Natl Labs, Livermore, CA 94550 USA. Iowa State Univ Sci & Technol, Dept Math, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RP Bartelt, MC (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 13 TC 71 Z9 71 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 AUG 31 PY 1998 VL 81 IS 9 BP 1901 EP 1904 DI 10.1103/PhysRevLett.81.1901 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300038 ER PT J AU Faulkner, JS Wang, Y Stocks, GM AF Faulkner, JS Wang, Y Stocks, GM TI Core level chemical shifts in metallic alloys SO PHYSICAL REVIEW LETTERS LA English DT Article ID INDIVIDUAL PAIR DISPLACEMENTS; BINDING-ENERGY SHIFTS; ELECTRONIC-STRUCTURE; SCATTERING; FE46.5NI53.5; FE22.5NI77.5; DENSITY; ORDER AB The average chemical shifts and the distribution of the shifts about the average are obtained for CuPd, CuZn, and AgPd alloys using supercells that contain hundreds of atoms. Density functional theory and local density approximation (DFT-LDA) calculations are carried out using the order-N locally self-consistent multiple-scattering method. The DFT-LDA calculations provide reliable predictions for the chemical shifts in the alloys, but the electron spectroscopy for chemical analysis potential model does not. C1 Florida Atlantic Univ, Alloy Res Ctr, Boca Raton, FL 33431 USA. Florida Atlantic Univ, Dept Phys, Boca Raton, FL 33431 USA. Pittsburgh Supercomp Ctr, Pittsburgh, PA 15213 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37830 USA. RP Faulkner, JS (reprint author), Florida Atlantic Univ, Alloy Res Ctr, Boca Raton, FL 33431 USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 29 TC 36 Z9 36 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1905 EP 1908 DI 10.1103/PhysRevLett.81.1905 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300039 ER PT J AU Li, X Wu, HB Wang, XB Wang, LS AF Li, X Wu, HB Wang, XB Wang, LS TI s-p hybridization and electron shell structures in aluminum clusters: A photoelectron spectroscopy study SO PHYSICAL REVIEW LETTERS LA English DT Article ID SIMPLE METAL-CLUSTERS; IONS; DISSOCIATION; TRANSITION; PHYSICS; MODEL AB Using photoelectron spectroscopy of size-selected Al-x(-) (x = 1-162) clusters, we studied the electronic structure evolution of Al, and observed that the Al 3s- and 3p-derived bands evolve and broaden with cluster size and begin to overlap at Al-9. Direct spectroscopic signatures were obtained for electron shell structures with spherical shell closings at Al-11(-), Al-13(-), Al-19(-), Al-23(-), Al-35(-), Al-37(-), Al-46. Al-52, Al-55(-), Al-56, Al-66, and Al-73(-) The electron shell effect diminishes above Al-75 and new spectral features appearing in Al-x(-) (x > 100) suggest a possible geometrical packing effect in large clusters. C1 Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Washington State Univ, Dept Phys, 2710 Univ Dr, Richland, WA 99352 USA. NR 27 TC 248 Z9 259 U1 3 U2 33 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 AUG 31 PY 1998 VL 81 IS 9 BP 1909 EP 1912 DI 10.1103/PhysRevLett.81.1909 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300040 ER PT J AU Greven, M Birgeneau, RJ AF Greven, M Birgeneau, RJ TI Correlations and Neel order of randomly diluted quantum spin ladders SO PHYSICAL REVIEW LETTERS LA English DT Article ID NONMAGNETIC IMPURITIES; HEISENBERG-CHAINS; MONTE-CARLO; SYSTEM; GAP; SR(CU1-XZNX)(2)O-3; MODEL AB We present a Monte Carlo study of the correlation length xi of randomly diluted antiferromagnetic spin-1/2 two-chain Heisenberg ladders with weak and intermediate interchain couplings, J/J less than or equal to 1. We are able to access the experimentally relevant low-temperature regime, T/J approximate to 1/500, and find (i) that the form xi(z, T) = A(z) + B(z)T-v, with v = 0.40(5), describes our data at low and moderate dilution z and up to rather high temperatures, (ii) evidence for scaling of xi J/J in the variable zJ/J at weak J/J, (iii) an enhancement of correlations that is strongest for a fraction z approximate to J/(8J) of dilutants, and (iv) that the Neel temperature of Sr(Cu1-xZnz)(2)O-3 corresponds well to a curve of constant correlation length xi = 18(2) of the single diluted ladder with J/J less than or equal to 1/2. C1 Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA. MIT, Dept Phys, Cambridge, MA 02139 USA. RP Greven, M (reprint author), Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA. NR 29 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1945 EP 1948 DI 10.1103/PhysRevLett.81.1945 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300049 ER PT J AU Park, JH Vescovo, E Kim, HJ Kwon, C Ramesh, R Venkatesan, T AF Park, JH Vescovo, E Kim, HJ Kwon, C Ramesh, R Venkatesan, T TI Magnetic properties at surface boundary of a half-metallic ferromagnet La0.7Sr0.3MnO3 SO PHYSICAL REVIEW LETTERS LA English DT Article ID PEROVSKITE MANGANITE FILMS; SPIN POLARIZATION; MAGNETORESISTANCE; TEMPERATURE; SCATTERING; INJECTION; JUNCTIONS AB The surface-boundary magnetization (M-SB) for a manganese perovskite La0.7Sr0.3MnO3 has been investigated using spin-resolved photoemission spectroscopy, which has an similar to 5 Angstrom probing depth. M-SB shows the full moment at very low temperature but decays much faster than the bulk magnetization (M-B) upon heating. This result provides direct insight into various novel properties at grain and surface boundaries observed in the polycrystalline samples and junctions of manganese perovskites. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. Univ Maryland, Dept Phys, Ctr Superconduct Res, College Pk, MD 20742 USA. RP Park, JH (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RI Kwon, Chuhee/A-8687-2008; Venkatesan, Thirumalai/E-1667-2013 NR 26 TC 360 Z9 362 U1 1 U2 40 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 AUG 31 PY 1998 VL 81 IS 9 BP 1953 EP 1956 DI 10.1103/PhysRevLett.81.1953 PG 4 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300051 ER PT J AU Glendenning, NK AF Glendenning, NK TI Comment on "Signal of quark deconfinement in the timing structure of pulsar spin-down" - Reply SO PHYSICAL REVIEW LETTERS LA English DT Article C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA. RP Glendenning, NK (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 31 PY 1998 VL 81 IS 9 BP 1984 EP 1984 DI 10.1103/PhysRevLett.81.1984 PG 1 WC Physics, Multidisciplinary SC Physics GA 114TY UT WOS:000075626300061 ER PT J AU Rosmej, FB Abdallah, J AF Rosmej, FB Abdallah, J TI Blue satellite structure near He-alpha and He-beta and redistribution of level populations SO PHYSICS LETTERS A LA English DT Article DE blue satellites; dielectronic capture; autoionising levels; redistribution ID LI-LIKE SATELLITES; PLASMAS; LINES; SPECTRA; TRANSITIONS; ELECTRONS; IONS AB For a wide class of ions a mechanism for the emission of blue satellites close to the He-like resonance line in dense plasmas is proposed. It is based on the collisional transfer of population between autoionising levels. Detailed collisional radiative calculations involving all J-split autoionising levels are carried out for Al and may serve as a benchmark. A general consideration of redistribution effects inside the autoionising levels discovered diagnostically attractive density effects for laser-produced plasmas for both the He-alpha and He-beta satellite structure. (C) 1998 Elsevier Science B.V. C1 Ruhr Univ Bochum, Inst Expt Phys 5, D-44780 Bochum, Germany. Univ Calif Los Alamos Natl Lab, Atom & Opt Phys Grp T4, Los Alamos, NM 87545 USA. RP Rosmej, FB (reprint author), Ruhr Univ Bochum, Inst Expt Phys 5, D-44780 Bochum, Germany. NR 23 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 31 PY 1998 VL 245 IS 6 BP 548 EP 554 DI 10.1016/S0375-9601(98)00451-4 PG 7 WC Physics, Multidisciplinary SC Physics GA 113WJ UT WOS:000075576600006 ER PT J AU Vo-Dinh, T AF Vo-Dinh, T TI Development of a DNA biochip: principle and applications SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article; Proceedings Paper CT 4th European Conference on Optical Chemical Sensors and Biosensors CY MAR 29-APR 01, 1998 CL MUNSTER, GERMANY DE biochip; DNA fluorescence detection; integrated circuit; human immune-deficiency virus ID INFECTION; PROBES; VIRUS AB This paper provides an overview of the operating principle of a DNA biochip based on integrated circuit for use in biomedical diagnostics. The device is a self-contained system with photosensors, amplifiers, discriminators and logic circuitry on board. The development and evaluation of various microchip system components of the genosensor are reviewed. Fluorescence detection of gene probes specific to DNA sequences related to pathogens such as the human immune-deficiency virus 1 (HIV1) system illustrates the usefulness and potential of the DNA biochip technology for rapid and cost-effective medical diagnostics. Potential usefulness of the DNA biochip in clinical applications and functional genomics research is discussed. (C) 1998 Elsevier Science S.A. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Vo-Dinh, T (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM tvo@ornl.gov NR 17 TC 43 Z9 48 U1 0 U2 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD AUG 31 PY 1998 VL 51 IS 1-3 BP 52 EP 59 DI 10.1016/S0925-4005(98)00182-8 PG 8 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA 156WD UT WOS:000078024400008 ER PT J AU Miranda, PB Pflumio, V Saijo, H Shen, YR AF Miranda, PB Pflumio, V Saijo, H Shen, YR TI Surfactant monolayers at solid-liquid interfaces: conformation and interaction SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 8th International Conference on Organized Molecular Films CY AUG 24-29, 1997 CL PACIFIC GROVE, CALIFORNIA SP Stanford Univ, Ctr Polymer Interfaces & Macromolec Assemblies, Thin Solid Films, NIH DE sum-frequency generation; self-assembly; surfactant monolayers; surface density; hydrophobic effect; chain-chain interaction ID SUM-FREQUENCY SPECTROSCOPY; VIBRATIONAL SPECTROSCOPY; CHAIN-LENGTH; WETTING PROPERTIES; WATER-INTERFACE; DEPENDENCE; ALCOHOLS; GOLD; COADSORPTION; ALKANETHIOLS AB Sum-frequency vibrational spectroscopy is used to study chain conformation of self-assembled surfactant monolayers at various solid-liquid interfaces. In contrast to monolayers with fully packed alkyl chains, the chain conformation of monolayers with lower surface density is found to be extremely sensitive to different liquid environments. Published by Elsevier Science S.A. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Shen, YR (reprint author), Univ Calif Berkeley, Dept Phys, 366 Le Conte Hall 7300, Berkeley, CA 94720 USA. RI Miranda, Paulo/C-5933-2012 OI Miranda, Paulo/0000-0002-2890-0268 NR 32 TC 19 Z9 19 U1 2 U2 12 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD AUG 31 PY 1998 VL 327 BP 161 EP 165 DI 10.1016/S0040-6090(98)00620-8 PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA 124MX UT WOS:000076187000037 ER PT J AU Hopkins, AR Rasmussen, PG Basheer, RA Annis, BK Wignall, GD Hamilton, WA AF Hopkins, AR Rasmussen, PG Basheer, RA Annis, BK Wignall, GD Hamilton, WA TI Investigation of ordering in polyaniline salt films prepared from hexafluoroisopropanol solutions SO SYNTHETIC METALS LA English DT Article DE polyaniline; films; hexafluoroisopropanol ID CONDUCTING POLYANILINE; SOLVENTS AB Hexafluoroisopropanol has proved to be a useful solvent for salts of the emeraldine form of polyaniline prepared from a number of sulfonic acids. Large peaks at relatively small X-ray scattering angles establish the presence of domains containing a periodicity with a spacing in the 1-3 nm range. The spacings suggest that the emeraldine chains are separated by distances equivalent to two anion lengths. The domain size in the direction of periodicity indicate that only 2-4 repeat units are involved. Neither the X-ray scattering nor results obtained from neutron reflectometry show evidence for preferential orientation of the domains. (C) 1998 Elsevier Science S.A. All rights reserved. C1 Univ Michigan, Ctr Macromol Sci & Engn, Ann Arbor, MI 48109 USA. Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA. GM Corp, Ctr Res & Dev, Polymers Dept, Warren, MI 48090 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Rasmussen, PG (reprint author), Univ Michigan, Ctr Macromol Sci & Engn, Ann Arbor, MI 48109 USA. OI Wignall, George/0000-0002-3876-3244 NR 19 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 30 PY 1998 VL 97 IS 1 BP 47 EP 51 DI 10.1016/S0379-6779(98)00109-X PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA 128CD UT WOS:000076386900009 ER PT J AU Meijer, AJHM Goldfield, EM Gray, SK Balint-Kurti, GG AF Meijer, AJHM Goldfield, EM Gray, SK Balint-Kurti, GG TI Flux analysis for calculating reaction probabilities with real wave packets SO CHEMICAL PHYSICS LETTERS LA English DT Article ID QUANTUM STATE DISTRIBUTIONS; SCATTERING; COLLISION; DYNAMICS; ACCURATE; SYSTEM AB A recent approach to obtain scattering probabilities involves propagating the real part of a wave packet and analysis in the asymptotic product channel. We show that real wave packet propagation can also be used with analysis methods based on flux through a surface. We also show the relation between asymptotic product analysis and flux-based methods. Flux analysis with real wave packets is illustrated with an application to D + H(2) --> DH + H in three dimensions. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Wayne State Univ, Dept Chem, Detroit, MI 48202 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England. RP Meijer, AJHM (reprint author), Wayne State Univ, Dept Chem, Detroit, MI 48202 USA. OI Meijer, Anthony/0000-0003-4803-3488 NR 21 TC 120 Z9 120 U1 1 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 AUG 28 PY 1998 VL 293 IS 3-4 BP 270 EP 276 DI 10.1016/S0009-2614(98)00743-X PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 115WN UT WOS:000075689500017 ER PT J AU Lee, SH Cummings, PT Simonson, JM Mesmer, RE AF Lee, SH Cummings, PT Simonson, JM Mesmer, RE TI Molecular dynamics simulation of the limiting conductance of NaCl in supercritical water SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DIELECTRIC FRICTION; AQUEOUS-SOLUTIONS; ALKALI-METAL; ION; 600-DEGREES-C; 25-DEGREES-C; ASSOCIATION; POTENTIALS; MOBILITY; FLOW AB We report molecular dynamics calculations of the ionic mobility and limiting conductance of NaCl in supercritical water as a function of density along an isotherm 5% above the critical temperature. The number of hydration water molecules around ions is found to dominate the behavior of the limiting conductance in the higher-density region while the interaction between the ions and hydration water molecules is found to dominate in the lower-density region. The different effects in the lower- and higher-density regimes lead to different slopes for the limiting conductance as a function of density in the two regimes. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Kyungsung Univ, Dept Chem, Pusan 608736, South Korea. RP Cummings, PT (reprint author), Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. RI Cummings, Peter/B-8762-2013 OI Cummings, Peter/0000-0002-9766-2216 NR 34 TC 42 Z9 42 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 AUG 28 PY 1998 VL 293 IS 3-4 BP 289 EP 294 DI 10.1016/S0009-2614(98)00766-0 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 115WN UT WOS:000075689500020 ER PT J AU Zhang, NY Yeung, ES AF Zhang, NY Yeung, ES TI On-line coupling of polymerase chain reaction and capillary electrophoresis for automatic DNA typing and HIV-1 diagnosis SO JOURNAL OF CHROMATOGRAPHY B LA English DT Article; Proceedings Paper CT 8th Annual Frederick Conference on Capillary Electrophoresis CY OCT 20-22, 1997 CL HOOD COLL, FREDERICK, MARYLAND HO HOOD COLL DE polymerase chain reaction; DNA; human immunodeficiency virus ID LASER-INDUCED FLUORESCENCE; CROSS-LINKED POLYACRYLAMIDE; SILICON-GLASS CHIPS; GEL-ELECTROPHORESIS; STRANDED-DNA; HIGH-SPEED; CONFORMATION POLYMORPHISM; AMPLIFICATION SYSTEMS; REACTION PRODUCTS; 1000 BASES AB We demonstrate an integrated on-line system with a fused-silica capillary as the microreactor for PCR and capillary gel electrophoresis with laser-induced fluorescence detection for DNA typing and disease diagnosis. Two applications have been investigated: the four short tandem repeat (STR) loci vWA, THO1, TPOX and CSF1PO (CTTv) for DNA typing, and DNA probe for human immunodeficiency virus (HIV-1) diagnosis. The CTTv are important loci in forensic and genetic linkage analysis. The PCR technique is a powerful tool in HIV research because it can detect the presence of the virus before any antibody response in the infected person. Thus it is important for early diagnosis. Multiplexed PCR in a fused-silica capillary, on-line injection, DNA denaturation and calibration based on a standard ladder have been successfully combined. Also, on-line liquid flow management, DNA separation and detect:on have been completely integrated. (C) 1998 Elsevier Science B.V. All rights reserved. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Yeung, ES (reprint author), US DOE, Ames Lab, Gilman Hall, Ames, IA 50011 USA. NR 42 TC 16 Z9 17 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4347 J9 J CHROMATOGR B JI J. Chromatogr. B PD AUG 28 PY 1998 VL 714 IS 1 BP 3 EP 11 DI 10.1016/S0378-4347(98)00105-4 PG 9 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 112UV UT WOS:000075513500002 PM 9746229 ER PT J AU Stone, DB Timmins, PA Schneider, DK Krylova, I Ramos, CHI Reinach, FC Mendelson, RA AF Stone, DB Timmins, PA Schneider, DK Krylova, I Ramos, CHI Reinach, FC Mendelson, RA TI The effect of regulatory Ca2+ on the in situ structures of troponin C and troponin I: A neutron scattering study SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE troponin structure; Ca2+ switch; regulation of muscle contraction; neutron scattering ID SKELETAL-MUSCLE TROPONIN; SMALL-ANGLE SCATTERING; X-RAY-SCATTERING; ESCHERICHIA-COLI; THIN-FILAMENTS; MYOSIN SUBFRAGMENT-1; COMPLEX; TROPOMYOSIN; EXPRESSION; CALCIUM AB The effects of regulatory amounts of Ca2+ on the in situ structures of troponin C (TnC) and troponin I (TnI) in whole troponin have been investigated by neutron scattering. Ln separate difference experiments, 97% deuterated TnC and TnI within whole troponin were studied +/-Ca2+ in 41.6% (H2O)-H-2 buffers in which protonated subunits were rendered "invisible". We found that the radius of gyration (R-g) Of TnI decreased by approximate to 10% upon addition of regulatory Ca2+ indicating that it was significantly more compact in the presence of Ca2+. The apparent cross-sectional radius of gyration (R-c) of TnI increased by about 9% when regulatory Ca2+ was bound to TnC. Modeling studies showed that the high-Q scattering patterns of TnI could be fit by a TnI which consisted of two subdomains: one, a highly oblate ellipsoid of revolution containing about 65% of the mass and the other,a highly prolate ellipsoid of resolution consisting of about 35% of the mass. No other fits could be found with this class of models. Best fits were achieved when the axes of revolution of these ellipsoids were steeply inclined with respect to each other. Ca2+ addition decreased the center of mass separation by about 1.5 nm. The R-g of TnI, its high-Q scattering pattern, and the resultant structure were different from previous results on neutron scattering by TnI in the (+Ca2+) TnC TnI complex. The R-g of TnC indicated that it was elongate in situ. The R-g of TnC was not sensitive to the Ca2+ occupancy of its regulatory sites. However, R-c increased upon Ca2+ addition in concert with expectations from NMR and crystallography of isolated TnC. The present observations indicate that TnI acts like a molecular switch which is controlled by smaller Ca2+ induced changes in TnC. (C) 1998 Academic Press. C1 Univ Calif San Francisco, Cardiovasc Res Inst, San Francisco, CA 94143 USA. Univ Calif San Francisco, Dept Biochem & Biophys, San Francisco, CA 94143 USA. Inst Max Von Laue Paul Langevin, Large Scale Struct Grp, F-38042 Grenoble, France. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-05599970 Sao Paulo, Brazil. RP Mendelson, RA (reprint author), Univ Calif San Francisco, Cardiovasc Res Inst, San Francisco, CA 94143 USA. RI Ramos, Carlos/C-1571-2012 OI Ramos, Carlos/0000-0002-7246-9081 FU NCRR NIH HHS [RR01614] NR 71 TC 56 Z9 56 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD AUG 28 PY 1998 VL 281 IS 4 BP 689 EP 704 DI 10.1006/jmbi.1998.1965 PG 16 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 114QZ UT WOS:000075621500010 PM 9710540 ER PT J AU Marsh, GE AF Marsh, GE TI Monopoles, gauge fields and de Rham's theorems SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID ABELIAN STOKES THEOREM; FORMULATION AB The topology assumed by most authors for a spacelike hypersurface in a spacetime containing a monopole is generally R-3 - {0}; save for the surface S-2 isolating the monopole, this space is unbounded. For such a topology, a consistency relation of de Rham's theorems shows that a single isolated monopole cannot exist. Monopoles, with charge +/-m, if they exist at all, must occur in pairs having opposite magnetic charge. An extension of de Rham's theorems to non-Abelian monopoles which are generalizations of Dirac monopoles (those characterized by pi(1)(G), the fundamental group of the gauge group G) is made using the definition of an ordered integral of a path-dependent curvature over a surface. This integral is similar to that found in the non-Abelian Stokes theorem. The implications of de Rham's theorems for non-Abelian monopoles are shown to be similar to the Abelian case. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Marsh, GE (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 37 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD AUG 28 PY 1998 VL 31 IS 34 BP 7077 EP 7094 DI 10.1088/0305-4470/31/34/011 PG 18 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA 117FM UT WOS:000075770300011 ER PT J AU Stancil, PC Gu, JP Havener, CC Krstic, PS Schultz, DR Kimura, M Zygelman, B Hirsch, G Buenker, RJ Bannister, ME AF Stancil, PC Gu, JP Havener, CC Krstic, PS Schultz, DR Kimura, M Zygelman, B Hirsch, G Buenker, RJ Bannister, ME TI Electron capture in collisions of C+ with H and H+ with C SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID MULTIPLY CHARGED IONS; ENERGY EXTRAPOLATION; PERTURBATION-THEORY; INELASTIC PROCESSES; TRANSITION MOMENTS; THERMAL ENERGIES; SLOW COLLISIONS; ATOMIC-HYDROGEN; CROSS-SECTIONS; EXCITED-STATES AB A comprehensive theoretical and experimental study of electron capture in collisions of C+ with H and H+ with C extending over the energy range 0.1 meV u(-1) to 1000 keV u(-1) is presented. A variety of theoretical approaches were used including those based on quantal molecular-orbital close-coupling (MOCC), multielectron hidden crossings (MEHC), quantal decay and classical trajectory Monte Carlo techniques. Radiative charge transfer cross sections were computed using the optical potential/distorted wave (OPDW) and fully quantal (FQ) approaches. The MOCC, OPDW and FQ calculations incorporated ab initio potentials, nonadiabatic coupling matrix elements and transition moments computed at the configuration-interaction level. Ab initio potential surfaces in the plane of complex internuclear distance were obtained for the MEHC calculations. Merged-beam measurements were performed between 75 eV u(-1) and 1.7 keV u(-1) for the C+/H(D) collision system. Diagnostics of the C+ beam with a crossed electron beam could find no presence of a C+ metastable component. The current results, in conjunction with previous measurements, are used to deduce a set of recommended cross sections. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Berg Univ Gesamthsch Wuppertal, D-42097 Wuppertal, Germany. Yamaguchi Univ, Sch Allied Hlth Sci, Ube, Yamaguchi 755, Japan. Rice Univ, Dept Phys, Houston, TX 77251 USA. Univ Nevada, Dept Phys, WM Keck Lab Computat Phys, Las Vegas, NV 89154 USA. RP Stancil, PC (reprint author), Oak Ridge Natl Lab, Div Phys, POB 2008, Oak Ridge, TN 37831 USA. NR 53 TC 28 Z9 28 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD AUG 28 PY 1998 VL 31 IS 16 BP 3647 EP 3663 DI 10.1088/0953-4075/31/16/017 PG 17 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 117FW UT WOS:000075771100017 ER PT J AU Song, CS O'Connor, P Takatsuka, T Gardner, TJ AF Song, CS O'Connor, P Takatsuka, T Gardner, TJ TI Advances in catalysis and processes for heavy oil conversion: an introduction SO CATALYSIS TODAY LA English DT Editorial Material C1 Penn State Univ, Fuel Sci Program, University Pk, PA 16802 USA. Penn State Univ, Lab Hydrocarbon Proc Chem, University Pk, PA 16802 USA. Akzo Nobel Catalysts, Prod Dev FCC Worldwide, NL-3800 AE Amersfoort, Netherlands. Chiyoda Corp, Environm Technol Ctr, Kanagawa Ku, Yokohama, Kanagawa 221, Japan. Sandia Natl Labs, Catalysis & Chem Technol Dept, Albuquerque, NM 87185 USA. RP Song, CS (reprint author), Penn State Univ, Fuel Sci Program, University Pk, PA 16802 USA. RI Song, Chunshan/B-3524-2008 OI Song, Chunshan/0000-0003-2344-9911 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD AUG 27 PY 1998 VL 43 IS 3-4 BP 159 EP 159 PG 1 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 122MQ UT WOS:000076076400001 ER PT J AU Cugini, AV Rothenberger, KS Krastman, D Ciocco, MV Thompson, RL McCreary, C Gardner, TJ AF Cugini, AV Rothenberger, KS Krastman, D Ciocco, MV Thompson, RL McCreary, C Gardner, TJ TI The use of coal liquefaction catalysts for coal/oil coprocessing and heavy oil upgrading SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT 213th American-Chemical-Society National Meeting CY APR 13-17, 1997 CL SAN FRANCISCO, CALIFORNIA SP Amer Chem Soc DE coal liquefaction; heavy oil upgrading; coal-oil coprocessing ID HYDROGENATION AB The catalytic hydrogenation of heavy oil and mixed coal-heavy oil (coprocessing) systems has been the focus of a recent study at the Federal Energy Technology Center (FETC). The intent of this effort was to extend the use of coal liquefaction technologies to heavy oil upgrading and coprocessing systems. Specifically, new dispersed molybdenum-based catalysts developed at FETC and a novel silica-doped hydrous titanium oxide (HTO : Si)-supported NiMo catalyst developed at Sandia National Laboratories (SNL) were tested in these systems. The results indicate the potential of coal liquefaction catalysts for use in coprocessing and heavy oil upgrading. High conversions of coal-oil mixtures were observed with dispersed catalyst loadings as low as 100 ppm Mo. Similar results were observed in heavy oil systems. Also, the novel NiMo/HTO : Si catalyst was at least as effective as commercially-available supported catalysts (e.g. Amocat 1C) for conversion of high boiling point material to distillable products and aromatics removal. Published by Elsevier Science B.V. C1 US DOE, Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. Parsons Infrastruct & Technol Grp Inc, Library, PA 15129 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Cugini, AV (reprint author), US DOE, Fed Energy Technol Ctr, POB 10940, Pittsburgh, PA 15236 USA. NR 17 TC 3 Z9 5 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD AUG 27 PY 1998 VL 43 IS 3-4 BP 291 EP 303 DI 10.1016/S0920-5861(98)00158-8 PG 13 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 122MQ UT WOS:000076076400014 ER PT J AU Ferrare, RA Melfi, SH Whiteman, DN Evans, KD Leifer, R AF Ferrare, RA Melfi, SH Whiteman, DN Evans, KD Leifer, R TI Raman lidar measurements of aerosol extinction and backscattering - 1. Methods and comparisons SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID OPTICAL-PROPERTIES; ATMOSPHERIC AEROSOL; NEPHELOMETER; TROPOSPHERE; AIRBORNE; COUNTER; RATIO AB This paper examines the aerosol backscattering and extinction profiles measured at night by the NASA Goddard Space Flight Center Scanning Raman Lidar (SRL) during the remote cloud sensing (RCS) intensive operations period (IOP) at the Department of Energy Atmospheric Radiation Measurement (ARM) southern Great Plains (SGP) site in April 1994. These lidar data are used to derive aerosol profiles for altitudes between 0.015 and 5 km. Since this lidar detects Raman scattering from nitrogen and oxygen molecules as well as the elastic scattering from molecules and aerosols, it measures both aerosol backscattering and extinction simultaneously, The aerosol extinction/backscattering ratio varied between approximately 30 sr and 75 sr at 351 nm. Aerosol optical thicknesses derived by integrating the lidar profiles of aerosol extinction measured at night between 0.1 and 5 km are found to be about 10-40% lower than those measured by a Sun photometer during the day. This difference is attributed to the contribution by stratospheric aerosols not included in the lidar estimates as well as to diurnal differences in aerosol properties and concentrations. Aerosol profiles close to the surface were acquired by pointing the lidar nearly horizontally. Measurements of aerosol scattering from a tower-mounted nephelometer are found to be 40% lower than lidar measurements of aerosol extinction over a wide range of relative humidities even after accounting for the difference in wavelengths. The reasons for this difference are not clear but may be due to the inability of the nephelometer to accurately measure scattering by large particles. C1 NASA, Langley Res Ctr, Hampton, VA 23681 USA. Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA. NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. Univ Maryland Baltimore Cty, Joint Ctr Earth Syst Technol, Baltimore, MD 21250 USA. US DOE, Environm Measurements Lab, New York, NY 10014 USA. RP Ferrare, RA (reprint author), NASA, Langley Res Ctr, Mail Stop 401A,Bldg 1250,Room 132A,21 Langley Blv, Hampton, VA 23681 USA. EM r.ferrare@larc.nasa.gov NR 35 TC 79 Z9 83 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD AUG 27 PY 1998 VL 103 IS D16 BP 19663 EP 19672 DI 10.1029/98JD01646 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 114ED UT WOS:000075595400018 ER PT J AU Feller, D Dixon, DA Peterson, KA AF Feller, D Dixon, DA Peterson, KA TI Heats of formation of simple boron compounds SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID MOLECULAR WAVE-FUNCTIONS; CONFIGURATION-INTERACTION CALCULATIONS; BODY PERTURBATION-THEORY; GAUSSIAN-BASIS SETS; BENCHMARK CALCULATIONS; DISSOCIATION-ENERGY; DIATOMIC HYDRIDES; 1ST-ROW; BORANE; ATOMS AB The heats of formation of BH, BH(2), BH(3), and B(2)H(6) have been obtained from ab initio coupled cluster calculations by using a systematic sequence of correlation consistent Gaussian basis sets. The best values were obtained by extrapolating the finite basis set results to the complete basis set limit and by incorporating an estimate of core/valence correlation effects. In general, the largest calculations in this study utilized quadruple-zeta-level basis sets that were augmented by an additional shell of diffuse functions. Even larger basis set calculations were performed on the smallest of the four systems in order to test the accuracy of the complete basis set extrapolation. Vibrational zero point energies were taken from experiment when available. Missing values were replaced by theoretical harmonic frequencies scaled to more closely approximate the experimental values. The calculated heats of formation are Delta HO(f)(0)(BH) = 106.2 +/- 0.3 kcal/mol, Delta H(f)(0)(BH(2)) = 78.4 +/- 0.6 kcal/mol, Delta H(f)(0)(BH(3)) = 25.8 +/- 0.7 kcal/mol, and Delta H(f)(0)(B(2)H(6)) = 13.7 +/- 1.4 kcal/mol. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Washington State Univ, Richland, WA 99352 USA. RP Feller, D (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, 906 Battelle Blvd,MS K1-96, Richland, WA 99352 USA. NR 51 TC 79 Z9 79 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD AUG 27 PY 1998 VL 102 IS 35 BP 7053 EP 7059 DI 10.1021/jp981734p PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 116UX UT WOS:000075744300024 ER PT J AU Gidalevitz, D Mindyuk, OY Stetzer, MR Heiney, PA Kurnaz, ML Schwartz, DK Ocko, BM McCauley, JP Smith, AB AF Gidalevitz, D Mindyuk, OY Stetzer, MR Heiney, PA Kurnaz, ML Schwartz, DK Ocko, BM McCauley, JP Smith, AB TI A conformational phase transition in a Langmuir film of an amphiphilic azacrown SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID AIR-WATER-INTERFACE; HEXACYCLEN DERIVATIVES; SELF-ORGANIZATION; MONOLAYERS; MOLECULES; DIFFRACTION; MESOPHASES; CRYSTALS AB We have used grazing-incidence X-ray diffraction, X-ray reflectivity, and Brewster-angle microscopy to study an amphiphilic azacrown derivative at the air-water interface. The compound studied has a ring-shaped, flexible core with six alkyl chains attached. As the density is increased, the molecules undergo a phase transition from a face-on structure, with the alkyl tails extending away from the interface, to a thicker edge-on structure, with the tails extending radially away from the core. Concomitant with this rearrangement, the film develops long-range in-plane structural order. C1 Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. Univ Penn, Res Struct Matter Lab, Philadelphia, PA 19104 USA. Tulane Univ, Dept Chem, New Orleans, LA 70118 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Heiney, PA (reprint author), Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. RI Kurnaz, Levent/B-8925-2008; Gidalevitz, David/D-6717-2012; Schwartz, Daniel/H-5153-2012 NR 22 TC 19 Z9 19 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 27 PY 1998 VL 102 IS 35 BP 6688 EP 6691 DI 10.1021/jp982412o PG 4 WC Chemistry, Physical SC Chemistry GA 116UU UT WOS:000075744000002 ER PT J AU Burakovsky, L Goldman, T AF Burakovsky, L Goldman, T TI On the Regge slopes intramultiplet relation SO PHYSICS LETTERS B LA English DT Article DE Regge phenomenology; chiral limit; heavy quark limit ID GLUON STRING MODEL; DUAL-PARTON MODEL; MASS-RELATIONS; INCLUSIVE SPECTRA; HIGH-ENERGIES; BARYONS; QUARKS AB We show that only additivity of inverse Regge slopes is consistent with both the formal chiral limit m(n) --> 0 and the heavy quark limit M(Q) much greater than M(n), where n = u,d, and rn,M are current and constituent quark masses, respectively. (C) 1998 Published by Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Burakovsky, L (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, MS B285, Los Alamos, NM 87545 USA. NR 32 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD AUG 27 PY 1998 VL 434 IS 3-4 BP 251 EP 256 DI 10.1016/S0370-2693(98)00821-1 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 119DC UT WOS:000075879400004 ER PT J AU Drake, GW Dixon, DA Sheehy, JA Boatz, JA Christe, KO AF Drake, GW Dixon, DA Sheehy, JA Boatz, JA Christe, KO TI Seven-coordinated pnicogens. Synthesis and characterization of the SbF72- and BiF72- dianions and a theoretical study of the AsF(7)(2-)dianion SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID COMPACT EFFECTIVE POTENTIALS; EXPONENT BASIS-SETS; VIBRATIONAL-SPECTRA; CRYSTAL-STRUCTURE; SALTS; FLUORIDE; EXAMPLE; ANIONS; HEPTACOORDINATION; ENCAPSULATION AB The novel seven-coordinated BiF72- and SbF72- dianions have been prepared and characterized. The Cs2BiF7, Rb2BiF7, K2BiF7 and Na2BiF7 salts were obtained in high yield by heating BiF5 with an excess of the corresponding alkali metal fluorides to about 250 degrees C. Attempts failed to prepare the corresponding BiF83- salts or Li2BiF7 under similar conditions. The [N(CH3)(4)](2)BiF7 Salt was obtained by the combination of excess N(CH3)(4)F with BiF5 in CH3CN solution at -31 degrees C. The (NO2)(2)BiF7 salt was prepared from BiF5 and a large excess of liquid FNO at -78 degrees C and decomposes at room temperature to NOBiF6 and FNO. The corresponding Cs2SbF7, K2SbF7, and [N(CH3)(4)](2)SbF7 salts were also synthesized in a similar fashion, but Na2SbF7 was not formed. The pronounced fluoride ion affinity of SbF6- was further demonstrated by the formation of some Cs2SbF7 when dry CsF and CsSbF6 were ball-milled at room temperature. The BiF72- and SbF72- anions, which are the first examples of binary pnicogen compounds with coordination numbers in excess of six, were characterized by vibrational spectroscopy and ab initio electronic structure calculations. They possess pentagonal bipyramidal, highly fluxional structures of D-5h symmetry, similar to those of IF7 and TeF7-, which are isoelectronic with SbF72-. Although our theoretical calculations indicate that AsF72- is also vibrationally stable, experiments to prepare this dianion were unsuccessful. C1 Raytheon STX, Edwards AFB, CA 93524 USA. Air Force Res Lab, Prop Directorate, Edwards AFB, CA 93524 USA. Univ So Calif, Loker Hydrocarbon Res Inst, Los Angeles, CA 90089 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Drake, GW (reprint author), Raytheon STX, Edwards AFB, CA 93524 USA. RI Christe, Karl/O-4885-2014 OI Christe, Karl/0000-0003-0661-5519 NR 45 TC 29 Z9 29 U1 0 U2 0 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 AUG 26 PY 1998 VL 120 IS 33 BP 8392 EP 8400 DI 10.1021/ja9805728 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA 114PX UT WOS:000075618900012 ER PT J AU Jang, SB Hung, LW Chi, YI Holbrook, EL Carter, RJ Holbrook, SR AF Jang, SB Hung, LW Chi, YI Holbrook, EL Carter, RJ Holbrook, SR TI Structure of an RNA internal loop consisting of tandem C-A(+) base pairs SO BIOCHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; CENTER-DOT-A; K-RAS GENE; CRYSTAL-STRUCTURE; MOLECULAR-DYNAMICS; RIBOSOMAL-RNA; RECOGNITION; MISMATCHES; HELIX; PH AB The crystal structure of the RNA octamer 5'-CGC(CA)GCG-3' has been determined from X-ray diffraction data to 2.3 Angstrom resolution. In the crystal, this oligomer forms a self-complementary double helix in the asymmetric unit. Tandem non-Watson-Crick C-A and A-C base pairs comprise an internal loop in the middle of the duplex, which is incorporated with little distortion of the A-form double helix. From the geometry of the C-A base pairs, it is inferred that the adenosine imino group is protonated and donates a hydrogen bond to the carbonyl group of the cytosine. The wobble geometry of the C-A(+) base pairs is very similar to that of the common U-G non-Watson-Crick pair. C1 Univ Calif Berkeley, Phys Biosci Div, Dept Biol Struct, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Holbrook, SR (reprint author), Univ Calif Berkeley, Phys Biosci Div, Dept Biol Struct, Lawrence Berkeley Lab, Melvin Calvin Bldg, Berkeley, CA 94720 USA. EM srholbrook@lbl.ov FU NIGMS NIH HHS [GM 49215] NR 39 TC 50 Z9 50 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD AUG 25 PY 1998 VL 37 IS 34 BP 11726 EP 11731 DI 10.1021/bi980758j PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 117QK UT WOS:000075793100003 PM 9718295 ER PT J AU Wadkins, RM Vladu, B Tung, CS AF Wadkins, RM Vladu, B Tung, CS TI Actinomycin D binds to metastable hairpins in single-stranded DNA SO BIOCHEMISTRY LA English DT Article ID NUCLEIC-ACID STRUCTURES; DISSOCIATION KINETICS; MODELING TOOL; TRANSCRIPTION; DRUG; SEQUENCE; 7-AMINO-ACTINOMYCIN-D; ANTIBIOTICS; COMPLEXES; LOOPS AB We have examined the role of DNA composition in the binding of actinomycin D to single-stranded DNA. By using the fluorescent analogue 7-aminoactinomycin D, we were able to monitor binding of the drug to ssDNA with single base changes distant from the 5'-TAGT-3' site previously determined to be a high-affinity site for actinomycin D binding (Wadkins et al. (1996) J. Mel. Biol. 262, 53-68). Our binding studies indicated that secondary structures in the ssDNA were likely to be responsible for binding the drug. A series of six low-melting DNA hairpins containing all or part of the 5'-TAGT-3' binding site were synthesized. The highest T-m observed for the melting of these hairpins was 34.2 +/- 0.3 degrees C, and it depended on the length of the stem region. These metastable hairpins were stabilized by 7-aminoactinomycin D, with the drug shifting the T-m for the drug-hairpin complex to similar to 45 degrees C. The hairpins showed very high affinity (K-d similar to 0.1 mu M) for 7-aminoactinomycin D, with some dependence on stem length. Digestion of the hairpins in the presence and absence of drug using mung bean nuclease, which specifically interacts with the loop region of hairpin DNA, revealed that the stable hairpins (i) contain a number of non-Watson-Crick base pairs, and (ii) undergo a conformational change in the loop region upon binding 7-aminoactinomycin D. Our results suggest that stabilization of unusual hairpins by actinomycin D may be an important aspect of the potent transcription inhibition activity of this drug. C1 Inst Drug Dev, Canc Therapy & Res Ctr, Biophys Chem Lab, San Antonio, TX 78245 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wadkins, RM (reprint author), Inst Drug Dev, Canc Therapy & Res Ctr, Biophys Chem Lab, 14960 Omicron Dr, San Antonio, TX 78245 USA. NR 44 TC 63 Z9 65 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD AUG 25 PY 1998 VL 37 IS 34 BP 11915 EP 11923 DI 10.1021/bi9809730 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 117QK UT WOS:000075793100023 PM 9718315 ER PT J AU Sharma, KK Gu, ZY Lal, D Caffee, MW Southon, J AF Sharma, KK Gu, ZY Lal, D Caffee, MW Southon, J TI Late Quaternary morphotectonic evolution of Upper Indus valley profile: A cosmogenic radionuclide study of river polished surfaces SO CURRENT SCIENCE LA English DT Article ID LADAKH; HIMALAYA; PAKISTAN; UPLIFT; TIBET; BE-10; AL-26 AB We have studied cosmogenic exposure ages in a set of five samples from the river polished surfaces (1-46 m above present river level) of the Indus river (Ladakh), at maximum discharge yield during August. These ages not only provide an opportunity to unravel the complex morphotectonic history of the Upper Indus valley, but also yield estimates of river incision rates during down-cutting of bedrocks. The three lower surfaces, 21 m, 6 m and 1 m above the river level have monotonically decreasing cosmic ray exposure ages of 22, 15 and 3 ka BP, suggesting that the river has been cutting the bedrocks initially (22-15 ka) at high rate of 2 mm yr(-1) which reduced to 0.3-0.4 mm yr(-1) since 15 ka BP, The latter is at par with the reported values of exhumation rate for the Ladakh region. The present data together with similar data from the Indus valley west of Skardu, reported earlier, give a better understanding of the so far poorly understood interplay of regional exhumation, incision rate and the role of climate in the morphotectonic evolution of the Upper Indus valley. C1 Wadia Inst Himalayan Geol, Dehra Dun 248001, Uttar Pradesh, India. Chinese Acad Sci, Inst Geol, Beijing, Peoples R China. Univ Calif San Diego, Scripps Inst Oceanog, Geosci Res Div, La Jolla, CA 92093 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RP Sharma, KK (reprint author), Wadia Inst Himalayan Geol, Dehra Dun 248001, Uttar Pradesh, India. RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 23 TC 8 Z9 8 U1 0 U2 2 PU CURRENT SCIENCE ASSN PI BANGALORE PA C V RAMAN AVENUE, PO BOX 8005, BANGALORE 560 080, INDIA SN 0011-3891 J9 CURR SCI INDIA JI Curr. Sci. PD AUG 25 PY 1998 VL 75 IS 4 BP 366 EP 371 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 124RK UT WOS:000076195500017 ER PT J AU Fayeulle, S Nastasi, M AF Fayeulle, S Nastasi, M TI Stress-related interdiffusion in dc sputtered TiN/B-C-N multilayers SO APPLIED PHYSICS LETTERS LA English DT Article ID CHEMICAL GUIDANCE; ION AB The diffusion in TiN/B-C-N multilayers during vacuum annealing at temperatures up to 1000 degrees C and/or 300 keV argon irradiation is studied. Changes in composition, stress field, bilayer repeat length, and interface quality are reported. The effect of stress on diffusion is proved by performing the same annealing or the same irradiation on a multilayer with and without compressive stress. During thermal annealing, demixing or phase separation is observed. On the contrary, during irradiation, mixing occurs. Both phenomena are enhanced in the presence of the stress field. (C) 1998 American Institute of Physics. [S0003-6951(98)00234-4]. C1 Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Fayeulle, S (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. NR 20 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 24 PY 1998 VL 73 IS 8 BP 1077 EP 1079 DI 10.1063/1.122089 PG 3 WC Physics, Applied SC Physics GA 113UN UT WOS:000075572000021 ER PT J AU Gao, C Duewer, F Lu, YL Xiang, XD AF Gao, C Duewer, F Lu, YL Xiang, XD TI Quantitative nonlinear dielectric microscopy of periodically polarized ferroelectric domains SO APPLIED PHYSICS LETTERS LA English DT Article ID 2ND-HARMONIC GENERATION AB A nonlinear dielectric scanning tip microwave near-field microscope capable of submicron quantitative imaging of nonlinear dielectric constant was developed. This nondestructive technique was used to image the nonlinear dielectric constant profiles of an yttrium-doped LiNbO3 single crystal with periodically polarized ferroelectric domains. (C) 1998 American Institute of Physics. [S0003-6951(98)00634-2] C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Xiang, XD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Xiang, Xiaodong/A-9445-2012; Xiang, Xiaodong/A-5936-2017 NR 9 TC 33 Z9 33 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 24 PY 1998 VL 73 IS 8 BP 1146 EP 1148 DI 10.1063/1.122111 PG 3 WC Physics, Applied SC Physics GA 113UN UT WOS:000075572000044 ER PT J AU Fu, HX Wang, LW Zunger, A AF Fu, HX Wang, LW Zunger, A TI Comment on "Comparison of the k center dot p and the direct diagonalization approaches for describing the electron structure of quantum dots" - Response SO APPLIED PHYSICS LETTERS LA English DT Editorial Material ID INP C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Fu, HX (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 14 TC 14 Z9 14 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 24 PY 1998 VL 73 IS 8 BP 1157 EP 1158 DI 10.1063/1.122155 PG 2 WC Physics, Applied SC Physics GA 113UN UT WOS:000075572000048 ER PT J AU Sano, Y Takahata, N Igarashi, G Koizumi, N Sturchio, NC AF Sano, Y Takahata, N Igarashi, G Koizumi, N Sturchio, NC TI Helium degassing related to the Kobe earthquake SO CHEMICAL GEOLOGY LA English DT Article DE helium; earthquake; isotope; degassing; groundwater ID HYDROTHERMAL SYSTEM; ARC TECTONICS; JAPAN; GROUNDWATER; ISOTOPES; VOLCANO; MANTLE; FLUXES; CARBON; RATIOS AB The He-3/He-4 ratios of groundwaters at Nishinomiya city close to the epicenter decreased immediately after the 1995 Kobe Earthquake in Japan, while the He-4/Ne-20 ratios increased. The delta D and delta(18)O values of the groundwaters were identical before and after the earthquake. Apparent groundwater ages calculated by tritium-He-3 concentrations also did not change, if we correct the addition of radiogenic helium into the samples by the earthquake. These observations may be attributed to following phenomenon; (1) release of radiogenic He as a result of micro-fracturing of rocks during the earthquake followed by degassing from the aquifer system, in the amount of about 4.0 +/- 1.3 x 10(-9) cm(3) STP/cm(3)-rock, (2) simple mixing of low-tritium water with high radiogenic helium in the clay layer and high-tritium water with atmospheric helium in the aquifer, and (3) flow path mixing in the region of the sample screen. If we take the (1) degassing hypothesis as a function of micro-fracturing, it is possible to calculate the total He degassing related to the Kobe earthquake, 4 x 10(11) cm(3) STP, which is about 3% of the steady-state global He flux of 1.2 x 10(13) cm(3) STP/year. Thus, earthquake may play an important role in He degassing from the solid earth. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Hiroshima Univ, Fac Sci, Dept Earth & Planetary Sci, Higashihiroshima 7398526, Japan. Univ Tokyo, Fac Sci, Earthquake Chem Lab, Tokyo 113, Japan. Geol Survey Japan, Tsukuba, Ibaraki 305, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Tokyo, Earthquake Res Inst, Tokyo 113, Japan. RP Sano, Y (reprint author), Hiroshima Univ, Fac Sci, Dept Earth & Planetary Sci, 1-3-1 Kagamiyama, Higashihiroshima 7398526, Japan. EM ysano@ue.ipc.hiroshima-u.ac.jp NR 31 TC 38 Z9 40 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD AUG 24 PY 1998 VL 150 IS 1-2 BP 171 EP 179 DI 10.1016/S0009-2541(98)00055-2 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 122JT UT WOS:000076069000010 ER PT J AU Summers, JS Roe, D Boyle, PD Colvin, M Shaw, BR AF Summers, JS Roe, D Boyle, PD Colvin, M Shaw, BR TI Structural studies of a borane-modified phosphate diester linkage: Ab initio calculations on the dimethylboranophosphate anion and the single-crystal X-ray structure of its diisopropylammonium salt SO INORGANIC CHEMISTRY LA English DT Article ID ACCEPTOR C1 Duke Univ, Dept Chem, Durham, NC 27708 USA. Sandia Natl Labs, Livermore, CA 94551 USA. N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Shaw, BR (reprint author), Duke Univ, Dept Chem, Durham, NC 27708 USA. NR 18 TC 33 Z9 33 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD AUG 24 PY 1998 VL 37 IS 17 BP 4158 EP 4159 DI 10.1021/ic971435z PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 115GX UT WOS:000075656600001 ER PT J AU Jia, SL Jentzen, W Shang, M Song, XZ Ma, JG Scheidt, WR Shelnutt, JA AF Jia, SL Jentzen, W Shang, M Song, XZ Ma, JG Scheidt, WR Shelnutt, JA TI Axial coordination and conformational heterogeneity of nickel(II) tetraphenylporphyrin complexes with nitrogenous bases SO INORGANIC CHEMISTRY LA English DT Article ID RESONANCE RAMAN-SPECTRA; PORPHYRIN FORCE-FIELD; SPIN COBALT PORPHYRINS; NONPLANAR PORPHYRINS; CYTOCHROMES-B; MOLECULAR STEREOCHEMISTRY; LIGAND ORIENTATION; CRYSTAL-STRUCTURE; ISOTOPE SHIFTS; HEME PROTEINS AB Axial ligation of nickel(II) 5,10,15,20-tetraphenylporphyrin (NiTPP) with pyrrolidine or piperidine has been investigated using X-ray crystallography, UV-visible spectroscopy, resonance Raman spectroscopy, and molecular mechanics (MM) calculations. By varying the pyrrolidine concentration in dichloromethane, distinct nu(4) Raman lines are found for the four-, five-, and six-coordinate species of NiTPP. The equilibrium constants for addition of the first and second pyrrolidine axial ligands are 1.1 and 3.8 M-1, respectively. The axial ligands and their orientations influence the type and magnitude of the calculated nonplanar distortion. The differences in the calculated energies of the conformers having different ligand rotational angles are small so they may coexist in solution. Because of the similarity in macrocyclic structural parameters of these conformers and the free rotation of the axial ligands, narrow and symmetric nu(2) and nu(8) Raman lines are observed. Nonetheless, the normal-coordinate structural-decomposition analysis of the nonplanar distortions of the calculated structures and the crystal structure of the bis(piperidine) complex reveals a relationship between the orientations of axial ligand(s) and the macrocyclic distortions. For the five-coordinate complex with the plane of the axial ligand bisecting the Ni-N-pyrrole bonds, a primarily ruffled deformation results. With the ligand plane eclipsing the Ni-N-pyrrole bonds, a mainly saddled deformation occurs. With the addition of the second axial ligand, the small doming of the five-coordinate complexes disappears, and ruffling or saddling deformations change depending on the relative orientation of the two axial ligands. The crystal structure of the NiTPP bis(piperidine) complex shows a macrocycle distortion composed of wav(x) and wav(y) symmetric deformations, but no ruffling, saddling, or doming. The difference in the calculated and observed distortions results partly from the phenyl group orientation imposed by crystal packing forces. NIM calculations predict three stable conformers (ruf, sad, and planar) for four-coordinate NiTPP, and resonance Raman evidence for these conformers was given previously. C1 Sandia Natl Labs, Mat Theory & Computat Dept, Albuquerque, NM 87185 USA. Univ New Mexico, Dept Chem, Albuquerque, NM 87131 USA. Univ Essen Gesamthsch, Nukl Med Klin & Poliklin, D-45147 Essen, Germany. Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA. RP Shelnutt, JA (reprint author), Sandia Natl Labs, Mat Theory & Computat Dept, POB 5800, Albuquerque, NM 87185 USA. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 69 TC 47 Z9 46 U1 4 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD AUG 24 PY 1998 VL 37 IS 17 BP 4402 EP 4412 DI 10.1021/ic980289+ PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 115GX UT WOS:000075656600036 ER PT J AU Schreckenbach, G Hay, PJ Martin, RL AF Schreckenbach, G Hay, PJ Martin, RL TI Theoretical study of stable trans and cis isomers in [UO2(OH)(4)](2-) using relativistic density functional theory SO INORGANIC CHEMISTRY LA English DT Article ID VIBRATIONAL FREQUENCIES; MOLECULAR GEOMETRIES; ELECTRONIC-STRUCTURE; FORCE-CONSTANTS; PRACTICAL TOOL; SPIN-ORBIT; CHEMISTRY; COMPLEXES; EXCHANGE; ABINITIO AB The title compound, uranyl(VI) tetrahydroxide [UO2(OH)(4)](2-), has been studied in detail using density functional theory (DFT) in the first systematic theoretical study of the compound. Scalar relativistic effects are included approximately by replacing the uranium core with a relativistic effective core potential. A total of nine stable structures have been characterized. Four of them (I-IV) possess the usual linear uranyl bond, and rapid exchange between these conformations is expected at finite temperatures. The uranyl and U-OH bond lengths of the minimum energy structure, I, are calculated as 1.842 and 2.334 Angstrom, respectively. This compares well with the experimental crystal structure values of 1.824(3) Angstrom and 2.258(3) Angstrom, respectively. The existence of stable structures with a bent uranyl bond ("cis-uranyl") is predicted for the first time (structures V-IX). These conformers are only 18-19 kcal/mol higher in energy than the global energy minimum, and their uranyl bond angles cover a range of 113-132 degrees. Harmonic vibrational frequencies for all stable conformers, I-IX, were calculated. They are compared to experiment where possible. a mechanism is suggested for the nonaqueous intramolecular oxygen ligand exchange in [UO2(OH)(4)](2-) between uranyl and hydroxide involving a "cis-uranyl" structure as a stable intermediate in a two-step process with a calculated activation energy of 38 kcal/mol. C1 Univ Calif Los Alamos Natl Lab, Theoret Div MS B268, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Seaborg Inst Transactinium Sci, Los Alamos, NM 87545 USA. RP Hay, PJ (reprint author), Univ Calif Los Alamos Natl Lab, Theoret Div MS B268, Los Alamos, NM 87545 USA. NR 44 TC 100 Z9 101 U1 0 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD AUG 24 PY 1998 VL 37 IS 17 BP 4442 EP 4451 DI 10.1021/ic980057a PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 115GX UT WOS:000075656600040 ER PT J AU Dimitrov, DA Wysin, GM AF Dimitrov, DA Wysin, GM TI Free vortex and vortex-pair lifetimes in classical two-dimensional easy-plane magnets SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID 2-DIMENSIONAL XY-MODEL; ANISOTROPIC HEISENBERG-MODEL; MONTE-CARLO; NEUTRON-SCATTERING; SQUARE LATTICE; DYNAMICS; VORTICES; ANTIFERROMAGNET; FERROMAGNETS; TRANSITION AB We report numerical simulation results for free-vortex lifetimes in the critical region of classical two-dimensional easy-plane ferro- and antiferromagnets having three-component order parameters. The fluctuations in the vortex number density in a spin dynamics simulation were used to estimate the lifetimes. The observed lifetimes are of the same order of magnitude but smaller than the characteristic timescale above which a phenomenological ideal vortex-gas theory that has been used to account for the central peak in the dynamic structure factor S-alpha alpha(q,omega) is expected to be valid. For strong anisotropy, where the vortices are in-plane, the free vortex lifetimes for ferromagnets and antiferromagnets are the same, while for weak anisotropy, where the vortices have non-zero out-of-easy-plane components, the lifetimes in antiferromagnets are smaller than in ferromagnets. The dependence of the free-vortex and total vortex densities on the size dependent correlation length in the critical region is examined. We also determined the lifetimes of vortex-antivortex pairs for T = T-KT and well below T-KT. The observed timescales are very short, and the observed pair densities are extremely small. These results suggest that pair creation and annihilation are unlikely to play any role in the central peak in S-xx(q,omega) observed in computer simulations for the ferromagnetic model for T less than or equal to T-KT. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA. RP Dimitrov, DA (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Wysin, Gary/I-8162-2012 OI Wysin, Gary/0000-0001-8422-800X NR 49 TC 5 Z9 5 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD AUG 24 PY 1998 VL 10 IS 33 BP 7453 EP 7465 DI 10.1088/0953-8984/10/33/014 PG 13 WC Physics, Condensed Matter SC Physics GA 115BJ UT WOS:000075643400014 ER PT J AU Chrien, R Millener, J AF Chrien, R Millener, J TI Hypernuclear and strange particle physics - Proceedings of the International Conference on Hypernuclear and Strange Particle Physics - Brookhaven National Laboratory, Upton, USA 13-18 October 1997 - Preface SO NUCLEAR PHYSICS A LA English DT Editorial Material C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Chrien, R (reprint author), Brookhaven Natl Lab, 501A, Upton, NY 11973 USA. EM chrien@bnl.gov; millener@bnl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP XI EP XII DI 10.1016/S0375-9474(98)90284-6 PG 2 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600001 ER PT J AU Rusek, A AF Rusek, A CA E907 Collaboration TI (K-stop(-),pi(0)) with the neutral meson spectrometer SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB AB During the 1997 proton run at the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory (BNL), we carried out a study of C-12(Kappa(stop)(-), pi(0))Chi using a combination of the Neutral Meson Spectrometer (NMS) and an active target as part of E907. Presented here is a brief review of tl-le method and a demonstration of the current performance with calibration data and preliminary results. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rusek, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM rusek@bnldag.ags.bnl.gov RI Androic, Darko/A-7482-2008 NR 2 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 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 111C EP 116C DI 10.1016/S0375-9474(98)00257-7 PG 6 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600014 ER PT J AU Ahmed, MW Comfort, J Gaulard, C Ramirez, A Chrien, R Gill, R Pile, P Rusek, A Sutter, R Briscoe, W Tang, L Peng, J Riedel, C Thiessen, H Neerman, C Johnston, K Sawafta, R Supek, I Hashimoto, O Peterson, RJ Saunders, A Ahmed, M Cui, X Empl, A Hungerford, E Lan, A Mayes, B Youn, M Zeps, V Bjoraker, J Dehnhard, D Gerald, J O'Donnell, J Androic, D Bosnar, D Uric, M Petkovic, T Planinic, M Taragin, M AF Ahmed, MW Comfort, J Gaulard, C Ramirez, A Chrien, R Gill, R Pile, P Rusek, A Sutter, R Briscoe, W Tang, L Peng, J Riedel, C Thiessen, H Neerman, C Johnston, K Sawafta, R Supek, I Hashimoto, O Peterson, RJ Saunders, A Ahmed, M Cui, X Empl, A Hungerford, E Lan, A Mayes, B Youn, M Zeps, V Bjoraker, J Dehnhard, D Gerald, J O'Donnell, J Androic, D Bosnar, D Uric, M Petkovic, T Planinic, M Taragin, M CA E907 Collaboration TI Characteristics of an active chamber target to locate the reaction vertex in the (K-stopped(-),pi(0)) reaction. SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB C1 Univ Houston, Dept Phys, Houston, TX 77204 USA. Arizona State Univ, Tempe, AZ USA. Brookhaven Natl Lab, Upton, NY USA. George Washington Univ, Washington, DC USA. Hampton Univ, Hampton, VA USA. Los Alamos Natl Lab, Los Alamos, NM USA. Louisiana Tech Univ, Ruston, LA USA. N Carolina Agr & Tech State Univ, Greensboro, NC USA. Rudjer Boskovic Inst, Zagreb, Croatia. Tohoku Univ, Sendai, Miyagi, Japan. Univ Colorado, Denver, CO USA. Univ Houston, Houston, TX 77204 USA. Univ Kentucky, Lexington, KY USA. Univ Minnesota, Minneapolis, MN USA. Univ Zagreb, Zagreb, Croatia. Weizmann Inst Sci, Rehovot, Israel. RP Ahmed, MW (reprint author), Univ Houston, Dept Phys, 4300 Calhoun, Houston, TX 77204 USA. EM mahmed@uh.edu RI Androic, Darko/A-7482-2008 NR 2 TC 1 Z9 1 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 117C EP 120C DI 10.1016/S0375-9474(98)00259-0 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600015 ER PT J AU Usmani, QN Bodmer, AR AF Usmani, QN Bodmer, AR TI Microscopic calculations of Lambda single-particle energies SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID HYPERON-NUCLEON INTERACTION; VARIATIONAL CALCULATIONS; HYPERNUCLEUS; BREAKING; MODELS AB Lambda binding energy data for total baryon number A less than or equal to 208 and for Lambda angular momenta l(Lambda) less than or equal to 3 are analyzed in terms of phenomenological (but generally consistent with meson-exchange) Lambda Nu and Lambda Nu Nu potentials. The Fermi hypernetted chain technique is used to calculate the expectation values for the Lambda binding tonuclear matter. Accurate effective Lambda Nu and Lambda Nu potentials are obtained which are folded with the core-nucleus nucleon densities to calculate the Lambda single-particle potential U-Lambda (r). We use a dispersive Lambda Nu Nu potential but also include an explicit rho dependence to allow for reduced repulsion in the surface, and the best fits have a large rho dependence giving consistency with the variational Monte Carlo calculations for He-5(Lambda). The exchange fraction of the Lambda Nu space-exchange potential is found to be 0.2-0.3 corresponding to m(Lambda)(*) similar or equal to (0.74 - 0.82)m(Lambda). Charge-symmetry breaking is found to be significant for heavy hypernuclei with a large neutron excess, with a strength consistent with that obtained from the A = 4 hypernuclei. C1 Univ Putra Malaysia, Dept Phys, Horsham, Vic 3400, Australia. Jamia Millia Islamia, Dept Phys, New Delhi 110025, India. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Usmani, QN (reprint author), Univ Putra Malaysia, Dept Phys, Horsham, Vic 3400, Australia. EM usmani@fsas.upm.edu.my; drbillig@aol.com NR 32 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 147C EP 156C DI 10.1016/S0375-9474(98)00263-2 PG 10 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600019 ER PT J AU Tzeng, YH Tzeng, SYT Kuo, TTS Lee, TSH AF Tzeng, YH Tzeng, SYT Kuo, TTS Lee, TSH TI Folded-diagram effective interactions for hypernuclei SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID HYPERON-NUCLEON-INTERACTION; REALISTIC EFFECTIVE INTERACTIONS; EXCHANGE-POTENTIAL APPROACH; BARYON-BARYON SCATTERING; MATRIX; MODELS AB We have performed folded-diagram G-matrix calculations of the particle-hole effective interaction for the hypernucleus O-16(Lambda), using both the Nijmegen soft-core and the Julich-B hyperon-nucleon potentials. Significant differences between the energy spectra given by these two potentials are noticed. The effects of the folded diagrams and the effective three-body force induced by Lambda-Sigma coupling are found io be important. C1 Acad Sinica, Inst Phys, Nankang, Taiwan. Taipei Univ Technol, Dept Phys, Taipei, Taiwan. SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Tzeng, YH (reprint author), Acad Sinica, Inst Phys, Nankang, Taiwan. EM kuo@nuclear.physics.sunysb.edu; lee@anlphy.phy.anl.gov NR 25 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 165C EP 168C DI 10.1016/S0375-9474(98)00266-8 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600022 ER PT J AU Niculescu, G AF Niculescu, G CA E93-18 Collaboration TI Associated Lambda production at Jefferson Lab SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID ELECTROPRODUCTION AB The H-1(e, e'K+)Lambda and H-1(e, e'K+)Sigma(0) reactions were studied as a function of the squared four-momentum-transfer: Q(2), and the virtual photon polarization, epsilon, thus enabling the separation of the longitudinal and transverse parts of the cross section. The existence of a sizable longitudinal component for the 1H(e, e' K+)Lambda reaction seems to be indicated by these data. C1 Hampton Univ, Hampton, VA 23668 USA. Univ Maryland, College Pk, MD 20742 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Kent State Univ, Kent, OH 44242 USA. Yerevan Phys Inst, Yerevan, Armenia. Temple Univ, Philadelphia, PA 19122 USA. Univ Bucharest, Bucharest, Romania. Coll William & Mary, Williamsburg, VA 23187 USA. N Carolina Agr & Technol State Univ, Greensboro, NC 27411 USA. Free Univ Amsterdam, Amsterdam, Netherlands. Ist Nazl Fis Nucl, Rome, Italy. Northwestern Univ, Evanston, IL 60201 USA. ISN, Grenoble, France. Univ Penn, Philadelphia, PA 19104 USA. Rensselaer Polytech Inst, Troy, NY 12180 USA. Oregon State Univ, Corvallis, OR 97331 USA. Univ Houston, Houston, TX 77204 USA. Kyungpook Natl Univ, Taegu 702701, South Korea. Tohoku Univ, Sendai, Miyagi 982, Japan. Florida Int Univ, Miami, FL 33199 USA. RP Niculescu, G (reprint author), Hampton Univ, Hampton, VA 23668 USA. EM gabriel@jlab.org NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 189C EP 196C DI 10.1016/S0375-9474(98)00272-3 PG 8 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600028 ER PT J AU Reinhold, J AF Reinhold, J CA E91-16 Collaboration TI Kaon electroproduction on deuterium SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB AB Kaon electroproduction on deuterium and hydrogen targets has been measured at beam energies of 3.245 and 2.445 GeV and momentum transfer Q(2) = 0.38 and 0.5 (GeV/c)(2). Associated Lambda production off a proton in the deuteron exhibits a quasifree production mechanism. The electroproduction of a Sigma(-) off the neutron could be extracted for the first time with reasonable errors. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Thomas Jefferson Natl Accelerator Lab, Newport News, VA 23606 USA. Hampton Univ, Hampton, VA 23668 USA. Kent State Univ, Kent, OH 44242 USA. Temple Univ, Philadelphia, PA 19122 USA. Coll William & Mary, Williamsburg, VA 23187 USA. CALTECH, Pasadena, CA 91125 USA. N Carolina Agr & Technol State Univ, Greensboro, NC 27411 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Virginia, Charlottesville, VA 22901 USA. Northwestern Univ, Evanston, IL 60201 USA. Univ Penn, Philadelphia, PA 19104 USA. Old Dominion Univ, Norfolk, VA 23529 USA. Florida Int Univ, Miami, FL 33199 USA. Yerevan Phys Inst, Yerevan 375036, Armenia. Rensselaer Polytech Inst, Troy, NY 12180 USA. Univ Mississippi, University, MS 38677 USA. Univ Illinois, Urbana, IL 61801 USA. RP Reinhold, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM joerg.reinhold@anl.gov RI Arrington, John/D-1116-2012 OI Arrington, John/0000-0002-0702-1328 NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 197C EP 204C DI 10.1016/S0375-9474(98)00273-5 PG 8 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600029 ER PT J AU Bennhold, C Goers, S Barth, J Braun, W Burgwinkel, R Ernst, J Glander, KH Hannapel, J Jopen, N Kalinowsky, H Kirch, U Klein, F Klein, FJ Klempt, E Kozela, A Lawall, R Li, ZP Link, J Mart, T Menze, D Neuerburg, W Paganetti, M Paul, E van Pee, H Plotzke, R Schumacher, M Schwille, WJ Smend, F Smyrski, J Tran, HN Tran, MQ Wehnes, F Wiegers, B Wieland, FW Wisskirchen, J AF Bennhold, C Goers, S Barth, J Braun, W Burgwinkel, R Ernst, J Glander, KH Hannapel, J Jopen, N Kalinowsky, H Kirch, U Klein, F Klein, FJ Klempt, E Kozela, A Lawall, R Li, ZP Link, J Mart, T Menze, D Neuerburg, W Paganetti, M Paul, E van Pee, H Plotzke, R Schumacher, M Schwille, WJ Smend, F Smyrski, J Tran, HN Tran, MQ Wehnes, F Wiegers, B Wieland, FW Wisskirchen, J TI K-0-Sigma(+) photoproduction with SAPHIR SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID ELECTROPRODUCTION; MODEL AB Preliminary results of the analysis of the reaction gamma + p --> K-0 + Sigma(+) are presented. We show the first measurement of the differential cross section and data for the total cross section, which are much improved with respect to previous measurements. The data are compared with model predictions from different isobar and quark models that give a good description of gamma + p --> K+ + Lambda and gamma + p --> K+ + Sigma(0) data in the same energy range. Results of ChPT describe the data adequately et threshold, while isobar models that include hadronic form factors reproduce the data at intermediate energies. C1 George Washington Univ, Dept Phys, Ctr Nucl Studies, Washington, DC 20052 USA. Univ Bonn, Inst Phys, D-53115 Bonn, Germany. Univ Bonn, ISKP, D-53115 Bonn, Germany. Univ Gottingen, Inst Phys 2, D-37073 Gottingen, Germany. Jagiellonian Univ, Krakow, Poland. Univ Indonesia, FMIPA, Depok 16424, Indonesia. TJNAF, Newport News, VA 23606 USA. Peking Univ, Dept Phys, Beijing 100871, Peoples R China. RP Bennhold, C (reprint author), George Washington Univ, Dept Phys, Ctr Nucl Studies, Washington, DC 20052 USA. EM bennhold@gwis2.circ.gwu.edu; ernst@iskp-uni.bonn.de NR 12 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 209C EP 212C DI 10.1016/S0375-9474(98)00275-9 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600031 ER PT J AU Lee, TSH Stoks, V Saghai, B Fayard, C AF Lee, TSH Stoks, V Saghai, B Fayard, C TI Study of hyperon-nucleon interactions with d(e,e ' K) reactions SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID EXCHANGE AB The dependence of the d(e,e'K+) reaction cross sections on the hyperon-nucleon interactions is investigated. It is shown that the data obtained with longitudinal-transverse separation or polarized photons can distinguish a class of Nijmegen models for hyperon-nucleon interactions which are chi(2) equivalent in fitting the existing 35 data points for hyperon-nucleon reactions. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. CEA Saclay, Serv Phys Nucl, F-91191 Gif Sur Yvette, France. Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France. RP Lee, TSH (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. EM stoks@theory2.phy.anl.gov; saghai@phnx7.saclay.cea.fr NR 6 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 247C EP 250C DI 10.1016/S0375-9474(98)00280-2 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600036 ER PT J AU Gibson, BF Timmermans, R AF Gibson, BF Timmermans, R TI The pi(+)-emission puzzle in He-4(Lambda) decay SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands. RP Gibson, BF (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 341C EP 344C DI 10.1016/S0375-9474(98)00294-2 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600050 ER PT J AU May, M AF May, M TI Search for nuclei containing two strange quarks SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID H-DIBARYON; LAMBDA-HYPERNUCLEI; K-,K+ REACTION; XI CAPTURE AB This paper discusses a search for nuclei containing two strange quarks performed at Brookhaven National Laboratory. The goals and approach of experiment E885 are reviewed. Preliminary missing mass spectra for a subset of the data are presented, showing sensitivity for Xi hypernuclei and H particle searches. Existence of an angular correlation between pions in the sequential decay of Lambda Lambda hypernuclei is suggested on theoretical grounds. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP May, M (reprint author), Brookhaven Natl Lab, Dept Phys, 510A, Upton, NY 11973 USA. EM may2@bnl.gov NR 20 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 363C EP 370C DI 10.1016/S0375-9474(98)00297-8 PG 8 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600053 ER PT J AU Yamamoto, K Alburger, D Bassalleck, B Berdoz, AR Burger, T Burger, M Carman, D Chrien, RE Davis, CA Fischer, H Franklin, GB Franz, J Gan, L Ichikawa, A Iijima, T Imai, K Khaustov, P Koran, P Kondo, Y Landry, M Lee, L Lowe, J Magahiz, R May, M McCrady, R Merrill, F Meyer, CA Page, SA Paschke, K Pile, PH Quinn, BP Ramsay, WD Rusek, A Sawafta, R Schumacher, RA Schumit, H Stotzer, RW Sutter, R Takeuchi, F van Oers, WTH Yosoi, M Zeps, V AF Yamamoto, K Alburger, D Bassalleck, B Berdoz, AR Burger, T Burger, M Carman, D Chrien, RE Davis, CA Fischer, H Franklin, GB Franz, J Gan, L Ichikawa, A Iijima, T Imai, K Khaustov, P Koran, P Kondo, Y Landry, M Lee, L Lowe, J Magahiz, R May, M McCrady, R Merrill, F Meyer, CA Page, SA Paschke, K Pile, PH Quinn, BP Ramsay, WD Rusek, A Sawafta, R Schumacher, RA Schumit, H Stotzer, RW Sutter, R Takeuchi, F van Oers, WTH Yosoi, M Zeps, V TI H-dibaryon search via the (K-,K+) reaction using a diamond target (BNL-E885) SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID WEAK DECAY; HYPERNUCLEI AB An experiment to study double-strangeness systems was performed at the BNL-AGS via the (K-, K+) reaction using a diamond target and scintillating fiber (SCIFI) blocks (E885). A search for the H dibaryon through the stopped Xi(-) process is one of the objectives. The number of stopped Xi(-)'s is about 9,000, and the expected sensitivity of the H dibaryon search is more than one order of magnitude higher than that of the previous experiment at KEK-PS (E224). C1 Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 606, Japan. Brookhaven Natl Lab, Upton, NY 11973 USA. Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA. Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany. KEK, High Energy Accelerator Res Org, Ibaraki 305, Japan. Univ Kentucky, Dept Phys, Lexington, KY 40507 USA. Kyoto Sangyo Univ, Fac Sci, Kyoto 603, Japan. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Manitoba, Dept Phys, Winnipeg, MB R3T 2N2, Canada. Univ New Mexico, Dept Phys, Albuquerque, NM 87131 USA. TRIUMF, Vancouver, BC V6T 2A3, Canada. Univ Birmingham, Dept Phys, Birmingham B15 2TT, W Midlands, England. RP Yamamoto, K (reprint author), Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 606, Japan. EM yamamoto@ne.scphys.kyoto-u.ac.jp; bassalleck@baryon.phys.unm.edu; chrien@bnl.gov; gbfranklin@cmu.edu; khaustov@cmu.edu; lee@anlphy.phy.anl.gov; may2@bnl.gov; pile@bnl.gov; rusek@bnldag.ags.bnl.gov; sawafta@cebaf.gov; zeps@pa.uky.edu RI Schumacher, Reinhard/K-6455-2013 OI Schumacher, Reinhard/0000-0002-3860-1827 NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 371C EP 374C DI 10.1016/S0375-9474(98)00298-X PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600054 ER PT J AU Hirata, Y Nara, Y Ohnishi, A Harada, T Randrup, J AF Hirata, Y Nara, Y Ohnishi, A Harada, T Randrup, J TI Formation of twin and double Lambda hypernuclei from Xi(-) absorption at rest on C-12 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB C1 Hokkaido Univ, Fac Sci, Dept Phys, Sapporo, Hokkaido 060, Japan. Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 31911, Japan. Sapporo Gakuin Univ, Dept Social Informat, Ebetsu, Hokkaido 069, Japan. Univ Calif Berkeley, Lawrence Berkeley Lab, Nucl Sci Div 70A 3307, Berkeley, CA 94720 USA. RP Hirata, Y (reprint author), Hokkaido Univ, Fac Sci, Dept Phys, Sapporo, Hokkaido 060, Japan. EM hirata@nucl.sci.hokudai.ac.jp; harada@rikaxp.riken.go.jp RI Ohnishi, Akira/F-7403-2011 OI Ohnishi, Akira/0000-0003-1513-0468 NR 6 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 389C EP 392C DI 10.1016/S0375-9474(98)00302-9 PG 4 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600058 ER PT J AU Cole, BA AF Cole, BA CA E910 Collaboration TI Strange particle production and an H-dibaryon search in p-A collisions at the AGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID HEAVY-ION COLLISIONS; HIGH-ENERGY; MULTIPARTICLE PRODUCTION AB In Experiment 910 at the Brookhaven National Laboratory AGS accelerator, we studied proton-nucleus collisions in a large-acceptance, TPC-based spectrometer using a variety of target/beam energy combinations. The experiment was designed to study strange particle production in proton-nucleus collisions and has excellent acceptance for neutral strange particles decaying at least 1 cm downstream of the target. The E910 spectrometer also has good sensitivity to Lambda p pi(-) decays and modest sensitivity to Sigma(-)p decay channels of the hypothesized H dibaryon. Preliminary results on the centrality dependence of Lambda production in 18 GeV p+Au collisions are presented along with results of our first search for H --> Lambda p pi(-) and H --> Sigma(-)p decays in the 18 GeV/c p+Au data set. C1 Columbia Univ, Nevis Labs, Irvington, NY 10533 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Florida State Univ, Tallahassee, FL 32306 USA. SUNY Stony Brook, Stony Brook, NY 11974 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Kent State Univ, Kent, OH 44242 USA. Yonsei Univ, Seoul 120749, South Korea. Univ Tennessee, Knoxville, TN 37996 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Cole, BA (reprint author), Columbia Univ, Nevis Labs, Irvington, NY 10533 USA. EM cole@nevis.columbia.edu OI Read, Kenneth/0000-0002-3358-7667; Thomas, James/0000-0002-6256-4536 NR 11 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 407C EP 416C DI 10.1016/S0375-9474(98)00306-6 PG 10 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600062 ER PT J AU Crawford, HJ AF Crawford, HJ TI H-particle searches with heavy ions SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID WEAK DECAY; DIBARYON; COLLISIONS AB This talk provides a status report on H searches using heavy-ion beams at the AGS. I will concentrate on the short lifetime regime of E896, a search for the H dibaryon using the Au beam, and briefly discuss E810 whose data has been analysed for H production from Si+Pb interactions. C1 Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. RP Crawford, HJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM crawford@lbl.gov NR 12 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 417C EP 422C DI 10.1016/S0375-9474(98)00307-8 PG 6 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600063 ER PT J AU Barish, KN AF Barish, KN CA E864 Collaboration TI Strangelet searches in high energy heavy ion collisions SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID QUARK-GLUON PLASMA; MATTER; GEV/C; DROPLETS; NUCLEATION; PARTICLES AB In this contribution I concentrate on the recent results from experiment E864 at the BNL-AGS. E864's recent analyses have achieved sensitivities of approximately 3 x 10(-8) per 10% central interaction for the production of charged strangelets and the first analysis for neutral strangelets is near completion. I put the results in the context of coalescence and quark-gluon plasma strangelet production models. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Ames Lab, Ames, IA USA. Univ Bari, I-70121 Bari, Italy. BNL, Upton, NY USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Iowa State Univ, Ames, IA 50011 USA. Univ Massachusetts, Amherst, MA 01003 USA. MIT, Cambridge, MA 02139 USA. Penn State Univ, University Pk, PA 16802 USA. Purdue Univ, W Lafayette, IN 47907 USA. USMA, W Point, NY USA. Vanderbilt Univ, Nashville, TN 37240 USA. Wayne State Univ, Detroit, MI 48202 USA. Yale Univ, New Haven, CT 06520 USA. RP Barish, KN (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, 405 Hilgard Ave, Los Angeles, CA 90095 USA. EM barish@physics.ucla.edu NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 423C EP 432C DI 10.1016/S0375-9474(98)00308-X PG 10 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600064 ER PT J AU Schaffner-Bielich, J AF Schaffner-Bielich, J TI Strangelets and strange quark matter SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID HEAVY-ION COLLISIONS; DROPLETS; CREATION; HADRONS; SYSTEMS; BAG; QCD AB I summarize the properties of finite lumps of strange quark matter (strangelets) with emphasis on the two scenarios for producing strange matter in relativistic heavy ion collisions. As an outlook, I discuss the possibility of short-lived strange composites and charmed matter. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Schaffner-Bielich, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. EM schaffne@nsdssd.lbl.gov NR 22 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 443C EP 450C DI 10.1016/S0375-9474(98)00310-8 PG 8 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600066 ER PT J AU Kahana, DE Kahana, SH AF Kahana, DE Kahana, SH TI Ultrarelativistic cascades and strangeness production SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB ID NUCLEAR COLLISIONS; PARTICLE SPECTRA; FRAGMENTATION; DEPENDENCE; DYNAMICS; GEV/C; MODEL; FLOW AB A two-phase cascade code, LUCIFER II [1], developed for the treatment of ultra high energy ion-ion collisions is applied to the production of strangeness at SPS energies root s = 17 - 20. This simulation is able to simultaneously describe both hard processes such as Drell-Yan and slower, soft processes such as the production of light mesons by separating the dynamics into two steps, a fast cascade involving only the nucleons in the original colliding relativistic ions followed, after an appropriate delay, by a normal multiscattering of the resulting excited baryons and mesons produced virtually in the first step. No energy loss can take place in the short time interval over which the first cascade takes place. The chief result is a reconciliation of the important Drell-Yan measurements with the apparent success of standard cascades to describe the nucleon stopping and meson production in heavy-ion experiments at the CERN SPS. C1 SUNY Stony Brook, Dept Phys, Stony Brook, NY 11791 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP SUNY Stony Brook, Dept Phys, Stony Brook, NY 11791 USA. EM dkahana@bnl.gov; kahana@bnl.gov OI Kahana, David Ewan/0000-0003-1266-9089; Kahana, Sidney/0000-0002-5790-9384 NR 28 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 465C EP 474C DI 10.1016/S0375-9474(98)00313-3 PG 10 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600069 ER PT J AU Mecking, BA AF Mecking, BA TI Strange-particle physics at Jefferson Lab SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT International Conference on Hypernuclear and Strange Particle Physics CY OCT 13-18, 1997 CL BROOKHAVEN NATL LAB, UPTON, NY HO BROOKHAVEN NATL LAB AB The Continuous Electron Beam Accelerator Facility (CEBAF) at the Thomas Jefferson National Accelerator Facility is devoted to the investigation of the electromagnetic structure of mesons, nucleons, and nuclei using high duty-cycle electron and photon beams in the energy range up to 4 GeV. The basic features and the status of the accelerator and the experimental instrumentation are presented. The program to study strange particle physics is discussed, and some specific examples are given. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Mecking, BA (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM mecking@cebaf.gov NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 24 PY 1998 VL 639 IS 1-2 BP 559C EP 568C DI 10.1016/S0375-9474(98)00326-1 PG 10 WC Physics, Nuclear SC Physics GA 123GZ UT WOS:000076118600082 ER PT J AU Erler, J Pierce, DM AF Erler, J Pierce, DM TI Bounds on supersymmetry from electroweak precision analysis SO NUCLEAR PHYSICS B LA English DT Review DE supersymmetry; precision experiments; radiative corrections; electroweak neutral current data analysis ID W-BOSON MASS; SEMILEPTONIC NEUTRINO SCATTERING; GRAND UNIFIED THEORIES; RARE B-DECAYS; STANDARD MODEL; TOP-QUARK; RADIATIVE-CORRECTIONS; PARITY NONCONSERVATION; B->S-GAMMA DECAY; PARTICLE PHYSICS AB The Standard Model global fit to precision data is excellent. The Minimal Supersymmetric Standard Model can also fit the data well, though not as well as the Standard Model. At best, supersymmetric contributions either decouple or only slightly decrease the total chi(2), at the expense of decreasing the number of degrees of freedom. In general, regions of parameter space with large supersymmetric corrections from light superpartners are associated with poor fits to the data. We contrast results of a simple (oblique) approximation with full one-loop results, and show that for the most important observables the non-oblique corrections can be larger than the oblique corrections, and must be taken into account. We elucidate the regions of parameter space in both gravity- and gauge-mediated models which are excluded. Significant regions of parameter space are excluded, especially with positive supersymmetric mass parameter mu. We give a complete listing of the bounds on all the superpartner and Higgs boson masses. For either sign of mu, and for all supersymmetric models considered, we set a lower limit on the mass of the lightest CP-even Higgs scaler, m(h) greater than or equal to 78 GeV. Also, the first and second generation squark masses are constrained to be above 280 (325) GeV in the supergravity (gauge-mediated) model. (C) 1998 Elsevier Science B.V. C1 Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Erler, J (reprint author), Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. EM erler@langacker.hep.upenn.edu; pierce@slac.stanford.edu NR 133 TC 69 Z9 69 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 AUG 24 PY 1998 VL 526 IS 1-3 BP 53 EP 80 DI 10.1016/S0550-3213(98)00359-9 PG 28 WC Physics, Particles & Fields SC Physics GA 114FD UT WOS:000075597700003 ER PT J AU Fukuda, Y Hayakawa, T Ichihara, E Inoue, K Ishihara, K Ishino, H Itow, Y Kajita, T Kameda, J Kasuga, S Kobayashi, K Kobayashi, Y Koshio, Y Miura, M Nakahata, M Nakayama, S Okada, A Okumura, K Sakurai, N Shiozawa, M Suzuki, Y Takeuchi, Y Totsuka, Y Yamada, S Earl, M Habig, A Kearns, E Messier, MD Scholberg, K Stone, JL Sulak, LR Walter, CW Goldhaber, M Barszczxak, T Casper, D Gajewski, W Halverson, PG Hsu, J Kropp, WR Price, LR Reines, F Smy, M Sobel, HW Vagins, MR Ganezer, KS Keig, WE Ellsworth, RW Tasaka, S Flanagan, JW Kibayashi, A Learned, JG Matsuno, S Stenger, VJ Takemori, D Ishii, T Kanzaki, J Kobayashi, T Mine, S Nakamura, K Nishikawa, K Oyama, Y Sakai, A Sakuda, M Sasaki, O Echigo, S Kohama, M Suzuki, AT Haines, TJ Blaufuss, E Kim, BK Sanford, R Svoboda, R Chen, ML Conner, Z Goodman, JA Sullivan, GW Hill, J Jung, CK Martens, K Mauger, C McGrew, C Sharkey, E Viren, B Yanagisawa, C Doki, W Miyano, K Okazawa, H Saji, C Takahata, M Nagashima, Y Takita, M Yamaguchi, T Yoshida, M Kim, SB Etoh, M Fujita, K Hasegawa, A Hasegawa, T Hatakeyama, S Iwamoto, T Koga, M Maruyama, T Ogawa, H Shirai, J Suzuki, A Tsushima, F Koshiba, M Nemoto, M Nishijima, K Futagami, T Hayato, Y Kanaya, Y Kaneyuki, K Watanabe, Y Kielczewska, D Doyle, RA George, JS Stachyra, AL Wai, LL Wilkes, RJ Young, KK AF Fukuda, Y Hayakawa, T Ichihara, E Inoue, K Ishihara, K Ishino, H Itow, Y Kajita, T Kameda, J Kasuga, S Kobayashi, K Kobayashi, Y Koshio, Y Miura, M Nakahata, M Nakayama, S Okada, A Okumura, K Sakurai, N Shiozawa, M Suzuki, Y Takeuchi, Y Totsuka, Y Yamada, S Earl, M Habig, A Kearns, E Messier, MD Scholberg, K Stone, JL Sulak, LR Walter, CW Goldhaber, M Barszczxak, T Casper, D Gajewski, W Halverson, PG Hsu, J Kropp, WR Price, LR Reines, F Smy, M Sobel, HW Vagins, MR Ganezer, KS Keig, WE Ellsworth, RW Tasaka, S Flanagan, JW Kibayashi, A Learned, JG Matsuno, S Stenger, VJ Takemori, D Ishii, T Kanzaki, J Kobayashi, T Mine, S Nakamura, K Nishikawa, K Oyama, Y Sakai, A Sakuda, M Sasaki, O Echigo, S Kohama, M Suzuki, AT Haines, TJ Blaufuss, E Kim, BK Sanford, R Svoboda, R Chen, ML Conner, Z Goodman, JA Sullivan, GW Hill, J Jung, CK Martens, K Mauger, C McGrew, C Sharkey, E Viren, B Yanagisawa, C Doki, W Miyano, K Okazawa, H Saji, C Takahata, M Nagashima, Y Takita, M Yamaguchi, T Yoshida, M Kim, SB Etoh, M Fujita, K Hasegawa, A Hasegawa, T Hatakeyama, S Iwamoto, T Koga, M Maruyama, T Ogawa, H Shirai, J Suzuki, A Tsushima, F Koshiba, M Nemoto, M Nishijima, K Futagami, T Hayato, Y Kanaya, Y Kaneyuki, K Watanabe, Y Kielczewska, D Doyle, RA George, JS Stachyra, AL Wai, LL Wilkes, RJ Young, KK TI Evidence for oscillation of atmospheric neutrinos SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUX; DETECTOR; MATTER; DECAY AB We present an analysis of atmospheric neutrino data from a 33.0 kton yr (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor nu(mu),<----> nu(tau) oscillations With sin(2) 2 theta > 0.82 and 5 x 10(-4) < Delta m(2) < 6 x 10(-3) eV(2) at 90% confidence level. C1 Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 1888502, Japan. Boston Univ, Dept Phys, Boston, MA 02215 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA. Calif State Univ Dominguez Hills, Dept Phys, Carson, CA 90747 USA. George Mason Univ, Dept Phys, Fairfax, VA 22030 USA. Gifu Univ, Dept Phys, Gifu 5011193, Japan. Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA. High Energy Accelerator Res Org, KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan. Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan. Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87544 USA. Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. Univ Maryland, Dept Phys, College Pk, MD 20742 USA. SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. Niigata Univ, Dept Phys, Niigata 9502181, Japan. Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea. Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan. Univ Tokyo, Tokyo 1130033, Japan. Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan. Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan. Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. Univ Washington, Dept Phys, Seattle, WA 98195 USA. RP Fukuda, Y (reprint author), Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 1888502, Japan. RI Takeuchi, Yasuo/A-4310-2011; Nakamura, Kenzo/F-7174-2010; Sobel, Henry/A-4369-2011; Suzuki, Yoichiro/F-7542-2010; Martens, Kai/A-4323-2011; Wilkes, R.Jeffrey/E-6011-2013; Kim, Soo-Bong/B-7061-2014; Sakurai, Nobuyuki/M-5009-2014; Ishino, Hirokazu/C-1994-2015; Koshio, Yusuke/C-2847-2015; Kibayashi, Atsuko/K-7327-2015 OI Sakurai, Nobuyuki/0000-0002-1002-217X; Ishino, Hirokazu/0000-0002-8623-4080; Koshio, Yusuke/0000-0003-0437-8505; NR 28 TC 3300 Z9 3314 U1 32 U2 273 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 AUG 24 PY 1998 VL 81 IS 8 BP 1562 EP 1567 DI 10.1103/PhysRevLett.81.1562 PG 6 WC Physics, Multidisciplinary SC Physics GA 112FJ UT WOS:000075483200007 ER PT J AU Jung, M Dunford, RW Gemmell, DS Kanter, EP Krassig, B LeBrun, TW Southworth, SH Young, L Carney, JPJ LaJohn, L Pratt, RH Bergstrom, PM AF Jung, M Dunford, RW Gemmell, DS Kanter, EP Krassig, B LeBrun, TW Southworth, SH Young, L Carney, JPJ LaJohn, L Pratt, RH Bergstrom, PM TI Manifestations of nonlocal exchange, correlation, and dynamic effects in x-ray scattering SO PHYSICAL REVIEW LETTERS LA English DT Article ID ATOMIC FORM-FACTORS; COMPTON-SCATTERING; ELASTIC-SCATTERING; WAVE-FUNCTIONS; BOUND ELECTRONS; SHELL ELECTRONS; CROSS-SECTIONS; PHOTONS; HE; LITHIUM AB We report precise measurements of differential x-ray scattering cross sections in Ne and He from 11-22 keV and develop a method for obtaining predictions of comparable accuracy (1%). The measurement of ratios (total scattering in Ne to He and Compton to Rayleigh scattering in Ne) facilitates comparison to theories. We find evidence for the need to include nonlocal exchange, electron correlation, and dynamic effects for an accurate description at low Z and conclude that no single current theory is sufficient. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA. Lawrence Livermore Natl Lab, N Div, Livermore, CA 94551 USA. RP Jung, M (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 26 TC 42 Z9 42 U1 0 U2 7 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 AUG 24 PY 1998 VL 81 IS 8 BP 1596 EP 1599 DI 10.1103/PhysRevLett.81.1596 PG 4 WC Physics, Multidisciplinary SC Physics GA 112FJ UT WOS:000075483200015 ER PT J AU Schone, WD Eguiluz, AG AF Schone, WD Eguiluz, AG TI Self-consistent calculations of quasiparticle states in metals and semiconductors SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUASI-PARTICLES; ENERGIES; APPROXIMATION; POTASSIUM AB We solve the Dyson equation for the one-particle Green's function in a periodic solid self-consistently within the shielded-interaction (or GW) approximation. The effect of self-consistency (propagator renormalization) is found to be substantial. We illustrate this finding via calculations of quasiparticle states in K and Si. In the case of Si we show that the current standard of ab initio quasiparticle theory, thr: GW self-energy diagram, fails to account for the observed value of the absolute band gap-if properly, i.e., self-consistently, evaluated. [S0031-9007(98)06874-4]. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. NR 28 TC 95 Z9 95 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 24 PY 1998 VL 81 IS 8 BP 1662 EP 1665 DI 10.1103/PhysRevLett.81.1662 PG 4 WC Physics, Multidisciplinary SC Physics GA 112FJ UT WOS:000075483200032 ER PT J AU Heffner, RH MacLaughlin, DE Nieuwenhuys, GJ Kimura, T Luke, GM Tokura, Y Uemura, YJ AF Heffner, RH MacLaughlin, DE Nieuwenhuys, GJ Kimura, T Luke, GM Tokura, Y Uemura, YJ TI Effects of reduced dimensionality on spin dynamics in the layered perovskite La1.4Sr1.6Mn2O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTERPLANE TUNNELING MAGNETORESISTANCE; MANGANITE CRYSTAL; TEMPERATURE; SITES; LA1-XCAXMNO3; LA1-XSRXMNO3; TRANSITION; MAGNETISM AB We report zero-field muon spin rotation data in single crystals of La1.4Sr1.6Mn2O7 for T = 5-325 K. The spin-lattice relaxation rate is spatially inhomogeneous below the 3D magnetic transition temperature T-C and anisotropic above T-C. We find evidence against 2D spin ordering or in-plane correlations above T-C. Additionally, the very slow spin fluctuations found below T-C in cubic (3D) perovskites like (La, Ca)MnO3 or (La, Sr)MnO3, and attributed to relatively small magnetoelastic polarons, are absent in La1.4Sr1.6Mn2O7. This suggests that the polaron size in the layered material is significantly larger than in the 3D perovskites. [S0031-9007(98)06898-7]. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands. Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 305, Japan. Columbia Univ, Dept Phys, New York, NY 10027 USA. Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 113, Japan. RP Heffner, RH (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RI Tokura, Yoshinori/C-7352-2009; Luke, Graeme/A-9094-2010; OI Luke, Graeme/0000-0003-4762-1173 NR 28 TC 30 Z9 30 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 24 PY 1998 VL 81 IS 8 BP 1706 EP 1709 DI 10.1103/PhysRevLett.81.1706 PG 4 WC Physics, Multidisciplinary SC Physics GA 112FJ UT WOS:000075483200043 ER PT J AU He, GW Dubrulle, B Graner, F AF He, GW Dubrulle, B Graner, F TI Thermodynamical versus log-Poisson distribution in turbulence SO PHYSICS LETTERS A LA English DT Article ID FULLY-DEVELOPED TURBULENCE; SCALE-INVARIANCE; TEMPERATURE; STATISTICS; EXPONENTS AB The thermodynamical model of intermittency in fully developed turbulence due to Castaing (B. Castaing, J. Phys. II France 6 (1996) 105) is investigated and compared with the log-Poisson model (Z-S, She, E. Leveque, Phys. Rev. Lett. 72 (1994) 336). It is shown that the thermodynamical model obeys general scaling laws and corresponds to the degenerate class of scale-invariant statistics. We also find that its structure function shapes have physical behaviors similar to the log-Poisson's one. The only difference between them lies in the convergence of the log-Poisson's structure functions and divergence of the thermodynamical one. As far as the comparison with experiments on intermittency is concerned, they are indifferent. (C) 1998 Published by Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China. Ctr Etud Saclay, CNRS, URA 2052, CEA,DSM,DAPNIA,Serv Astrophys, F-91191 Gif Sur Yvette, France. Observ Midi Pyrenees, CNRS, URA 285, F-31400 Toulouse, France. Univ Grenoble 1, Spectrometrie Phys Lab, CNRS, UMR 5588, F-38402 St Martin Dheres, France. RP He, GW (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 20 TC 5 Z9 6 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 24 PY 1998 VL 245 IS 5 BP 419 EP 424 DI 10.1016/S0375-9601(98)00468-X PG 6 WC Physics, Multidisciplinary SC Physics GA 112YN UT WOS:000075522600014 ER PT J AU Aceves, SM Berry, GD Garcia-Villazona, O AF Aceves, SM Berry, GD Garcia-Villazona, O TI Analytical and experimental evaluation of pressure vessels for cryogenic hydrogen storage. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI aceves, salvador/G-9052-2011 OI aceves, salvador/0000-0001-5687-7256 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 086-FUEL BP U859 EP U859 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902527 ER PT J AU Alam, TM AF Alam, TM TI Ab initio calculations of 31 P NMR chemical shifts and CSA tensors in phosphates. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 162-COMP BP U744 EP U744 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902187 ER PT J AU Allen, PG Bucher, JJ Edelstein, NM Shuh, DK AF Allen, PG Bucher, JJ Edelstein, NM Shuh, DK TI Chloride complexation of aqueous trivalent actinide ions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Ernest O Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 094-NUCL BP U345 EP U345 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001123 ER PT J AU Anghel, I Turin, HJ Carey, JW Reimus, PW AF Anghel, I Turin, HJ Carey, JW Reimus, PW TI Effects of mineralogy and cation-exchange capacity on lithium sorption to Yucca Mountain tuffs. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RI Carey, James/B-4421-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 090-ENVR BP U786 EP U786 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902310 ER PT J AU Assink, RA Click, CA Brinker, CJ Naik, SJ AF Assink, RA Click, CA Brinker, CJ Naik, SJ TI The investigation of molecular templating in amorphous silicas by NMR spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ New Mexico, Albuquerque, NM 87131 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 026-MACR BP U307 EP U307 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100932 ER PT J AU Baird, MJ Erwin, J AF Baird, MJ Erwin, J TI The production of diesel fuels from coal-derived liquids obtained from the direct liquefaction process. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SW Res Inst, San Antonio, TX 78228 USA. Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 006-PETR BP U597 EP U597 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001876 ER PT J AU Baker, RT Abrams, MB Cameron, TM Carter, CA Tumas, W Westcott, SA Nolan, SA AF Baker, RT Abrams, MB Cameron, TM Carter, CA Tumas, W Westcott, SA Nolan, SA TI Tandem catalysis and novel reaction media for addition of B-X bonds to unsaturated organics. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Mt Allison Univ, Dept Chem, Sackville, NB E4L 1G8, Canada. Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 194-COLL BP U639 EP U639 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901879 ER PT J AU Balazs, GB Cooper, JF Lewis, PR Adamson, MG AF Balazs, GB Cooper, JF Lewis, PR Adamson, MG TI Transition metal catalysts for the ambient temperature destruction of organic waste using peroxydisulfate. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 127-IEC BP U949 EP U949 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902805 ER PT J AU Barr, ME Jarvinen, GD Moody, EW Vaughn, RB AF Barr, ME Jarvinen, GD Moody, EW Vaughn, RB TI Sorption of Pu(IV) by soluble anion-exchange polymers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 088-NUCL BP U343 EP U343 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001117 ER PT J AU Barr, ME Jarvinen, GD Moody, EW Vaughn, RB AF Barr, ME Jarvinen, GD Moody, EW Vaughn, RB TI Sorption of Pu(IV) by soluble anion-exchange polymers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 005-TECH BP U543 EP U543 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901566 ER PT J AU Barrans, RE Casadio, C AF Barrans, RE Casadio, C TI Formation of diethanolamine boronates in aqueous solution. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 034-IEC BP U922 EP U922 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902713 ER PT J AU Bastacky, J Goerke, J Clements, JA Ngo, P Grewal, J Clausnitzer, E Ziesler, G Lien, A Lee, C AF Bastacky, J Goerke, J Clements, JA Ngo, P Grewal, J Clausnitzer, E Ziesler, G Lien, A Lee, C TI Surface tension of biological liquid surfaces: Measurement by low-temperature scanning electron microscopy of fluorocarbon microdroplets. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 284-COLL BP U666 EP U666 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901969 ER PT J AU Bautista, JA Atticks, K Hiller, R Sharples, F Gosztola, D Wasielewski, M Frank, HA AF Bautista, JA Atticks, K Hiller, R Sharples, F Gosztola, D Wasielewski, M Frank, HA TI Singlet and triplet energy transfer from peridinin to chlorophyll in the peridinin chlorophyll a protein from Amphidinium carterae SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Connecticut, Dept Chem, Storrs, CT 06269 USA. Macquarie Univ, Sch Biol Sci, N Ryde, NSW 2109, Australia. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 416-PHYS BP U780 EP U780 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002347 ER PT J AU Beitz, JV AF Beitz, JV TI Heavy element probes of fluoride ion availability in hydrofluoric acid. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60493 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 083-NUCL BP U342 EP U342 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001112 ER PT J AU Bell, AT Iglesia, E Khodakov, A Yang, J Su, SC Olthof, B AF Bell, AT Iglesia, E Khodakov, A Yang, J Su, SC Olthof, B TI Structure and catalytic properties of dispersed vanadia. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RI Khodakov, Andrei/I-3379-2014 OI Khodakov, Andrei/0000-0003-4599-3969 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 021-PHYS BP U629 EP U629 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001966 ER PT J AU Bernard, JG Schroeder, NC Clark, DL Ashley, KR Truong, AP AF Bernard, JG Schroeder, NC Clark, DL Ashley, KR Truong, AP TI Fundamental chemistry, characterization, and separation of technetium complexes in hanford waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 029-IEC BP U921 EP U921 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902708 ER PT J AU Bockrath, B LaCount, R Kern, D Parffitt, D Martello, D Frommell, E Keller, M AF Bockrath, B LaCount, R Kern, D Parffitt, D Martello, D Frommell, E Keller, M TI Characterization of MoS2 catalysts by controlled-atmosphere programmed-temperature oxidation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. VIROLAC Inc, Waynesburg, PA 15370 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 142-FUEL BP U876 EP U876 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902582 ER PT J AU Bond, AH Dietz, ML Sylvester, P Clearfield, A AF Bond, AH Dietz, ML Sylvester, P Clearfield, A TI Inorganic materials for potential use in radionuclide generators. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 050-IEC BP U927 EP U927 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902729 ER PT J AU Bond, AH Dietz, ML Chiarizia, R Huber, VJ Herlinger, AW Hay, BP AF Bond, AH Dietz, ML Chiarizia, R Huber, VJ Herlinger, AW Hay, BP TI Synergistic extraction of cations by dicyclohexano-18-crown-6 and dialkyl phosphoric acids in an alcohol diluent. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Argonne, IL 60439 USA. Loyola Univ, Chicago, IL 60226 USA. Pacific NW Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 024-IEC BP U919 EP U919 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902703 ER PT J AU Borole, AP Kaufman, EN AF Borole, AP Kaufman, EN TI Bioprocessing of heavy oils and desulfurization using electro-spray reactors. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RI Borole, AP/F-3933-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 147-FUEL BP U877 EP U877 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902587 ER PT J AU Brachmann, A Wruck, DA Palmer, CEA Terminello, LJ AF Brachmann, A Wruck, DA Palmer, CEA Terminello, LJ TI Laser induced photoacoustic breakdown spectroscopy for colloid size distribution and colloid concentration analysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Glenn T Seaborg Inst Transactinium Sci, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 177-COLL BP U634 EP U634 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901862 ER PT J AU Bray, LA Tingey, JM DesChane, JR Egorov, OB AF Bray, LA Tingey, JM DesChane, JR Egorov, OB TI Development of a unique Bismuth (Bi-213) automated generator for use in cancer therapy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 049-IEC BP U927 EP U927 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902728 ER PT J AU Brinker, CJ Sellinger, A Lu, Y Fan, H Huesing, N Ward, TJ Doshi, D Weiss, P AF Brinker, CJ Sellinger, A Lu, Y Fan, H Huesing, N Ward, TJ Doshi, D Weiss, P TI Evaporation-induced self-assembly of nanocomposite films and powders. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ New Mexico, Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA. RI Huesing, Nicola/E-7296-2011; Sellinger, Alan/C-6250-2015 OI Huesing, Nicola/0000-0003-2274-9779; Sellinger, Alan/0000-0001-6705-1548 NR 0 TC 1 Z9 1 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 059-MACR BP U316 EP U316 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100965 ER PT J AU Britt, PF Cooney, MJ Buchanan, AC AF Britt, PF Cooney, MJ Buchanan, AC TI Flash vacuum pyrolysis of hydroxy-substituted phenethyl phenyl ethers: Impact of hydrogen bonding on C-O homolysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 636-ORGN BP U559 EP U559 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001760 ER PT J AU Brock, SL Giraldo, O Suib, SL Potter, D Urban, V Thiyagarajan, P Ressler, T AF Brock, SL Giraldo, O Suib, SL Potter, D Urban, V Thiyagarajan, P Ressler, T TI Nanocrystals of manganese oxide: Structure, growth, and characteristics of sol-gel prepared thin films. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA. Argonne Natl Lab, Intense Pulsed Neurtron Source, Argonne, IL 60439 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RI Urban, Volker/N-5361-2015 OI Urban, Volker/0000-0002-7962-3408 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 015-MACR BP U304 EP U304 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100921 ER PT J AU Brown, GM Sloop, FV Moyer, BA Meyer, TJ AF Brown, GM Sloop, FV Moyer, BA Meyer, TJ TI Deuterium and tritium kinetic isotope effects for the oxidation of formate by ruthenium(IV) oxo compounds. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. RI Solominow, Sonia/A-4021-2008; Sloop, Jr., Frederick/J-2301-2016; Moyer, Bruce/L-2744-2016 OI Sloop, Jr., Frederick/0000-0001-6473-9507; Moyer, Bruce/0000-0001-7484-6277 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 636-INOR BP U192 EP U192 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000635 ER PT J AU Buchanan, AC Britt, PF AF Buchanan, AC Britt, PF TI Investigation of thermolysis pathways for diarylmethane model compounds under restricted diffusion SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 011-FUEL BP U836 EP U836 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902458 ER PT J AU Burleigh, M Dai, S Barnes, CE Xue, BZ AF Burleigh, M Dai, S Barnes, CE Xue, BZ TI Removal of Cu2+ from aqueous solutions via sol-gel extraction. A molecular imprinting approach. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 196-INOR BP U58 EP U58 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000197 ER PT J AU Butler, PD Hamilton, WA Magid, LJ Sommer, C Schurtenberger, P Slawecki, TM Hayter, JB AF Butler, PD Hamilton, WA Magid, LJ Sommer, C Schurtenberger, P Slawecki, TM Hayter, JB TI Effect of fluid flow on surfactant aggregates near a solid wall. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NIST, Gaithersburg, MD 20899 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. ETH Zurich, Inst Polymere, CH-8092 Zurich, Switzerland. RI Butler, Paul/D-7368-2011; Schurtenberger, Peter/K-1777-2013 OI Schurtenberger, Peter/0000-0002-2790-8831 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 268-COLL BP U661 EP U661 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901953 ER PT J AU Carrado, KA Xu, LQ AF Carrado, KA Xu, LQ TI Materials with controlled mesoporosity derived from synthetic PVP-clays. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem 200, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 058-MACR BP U316 EP U316 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100964 ER PT J AU Carrado, KA Xu, LQ AF Carrado, KA Xu, LQ TI In situ synthesis of polymer-clay nanocomposites from silicate gels. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem 200, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 032-MACR BP U308 EP U309 PN 3 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100938 ER PT J AU Carson, SD McDonald, MJ Garcia, MJ Tallant, DR AF Carson, SD McDonald, MJ Garcia, MJ Tallant, DR TI Radiation chemistry of simulated Mo-99 product. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 004-IEC BP U914 EP U914 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902683 ER PT J AU Chambers, SA AF Chambers, SA TI Surface structure determination of MBE grown iron and manganese oxides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 198-PHYS BP U717 EP U717 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002140 ER PT J AU Chen, Q Bertozzi, C AF Chen, Q Bertozzi, C TI The preparation and characterization of hema-modified surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 136-COLL BP U622 EP U623 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901822 ER PT J AU Chiarizia, F Horwitz, EP Dietz, ML AF Chiarizia, F Horwitz, EP Dietz, ML TI Uptake of actinides by diphosphonic acid based resins. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 2 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 086-NUCL BP U343 EP U343 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001115 ER PT J AU Christian, JD Tranter, TJ Kirkham, RJ AF Christian, JD Tranter, TJ Kirkham, RJ TI Separation of sodium from molybdenum in aqueous solutions by acidic alumina and by Dowex 50W-X8 cation resin. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lockheed Martin Idaho Technol Co, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 005-IEC BP U914 EP U914 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902684 ER PT J AU Clark, DL Conradson, SD Donohoe, RJ Keogh, DW Morris, DE Neu, MP Palmer, PD Runde, W Tait, CD AF Clark, DL Conradson, SD Donohoe, RJ Keogh, DW Morris, DE Neu, MP Palmer, PD Runde, W Tait, CD TI Structural and spectroscopic studies of heptavalent neptunium in alkaline solution. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Seaborg Inst Transactinium Sci, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 084-NUCL BP U342 EP U342 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001113 ER PT J AU Clark, NC Rau, JA Ott, KC Paffett, MT AF Clark, NC Rau, JA Ott, KC Paffett, MT TI The role of hydrocarbon reductant in metal entrained zeolite and AlPO denox catalysis SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 025-PETR BP U603 EP U603 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001895 ER PT J AU Costa, DA Smith, WH AF Costa, DA Smith, WH TI The redoxbehavior of actinide complexes in room temperture ionic liquid. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 592-INOR BP U179 EP U179 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000592 ER PT J AU Cournoyer, ME Quintana, D AF Cournoyer, ME Quintana, D TI Glovebox decontamination technology comparison. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 156-ENVR BP U807 EP U808 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902376 ER PT J AU Curiale, RL Bangerter, RM Sanchez, JS Lindley, K Stetzenbach, KJ AF Curiale, RL Bangerter, RM Sanchez, JS Lindley, K Stetzenbach, KJ TI Breakthrough curve development for pentafluorobenzoic acid, 2,6-difluorobenzoic acid, and iodide tracers in groundwater using HPLC methods. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Nevada Operat, Las Vegas, NV 89193 USA. IT Corp, Las Vegas, NV 89193 USA. Univ Nevada, Harry Reid Ctr Environm Studies, Las Vegas, NV 89154 USA. NR 0 TC 0 Z9 0 U1 2 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 097-ENVR BP U788 EP U788 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902317 ER PT J AU Dabestani, R Higgin, J Ivanov, I Sigman, ME AF Dabestani, R Higgin, J Ivanov, I Sigman, ME TI Photophysical and photochemical of 2-tert-butylanthracene adsorbed on silica. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI ivanov, ilia/D-3402-2015 OI ivanov, ilia/0000-0002-6726-2502 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 454-PHYS BP U791 EP U792 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002384 ER PT J AU Dadmun, MD Chidambaram, S Butler, PD Hamilton, WA AF Dadmun, MD Chidambaram, S Butler, PD Hamilton, WA TI What is a model liquid crystalline polymer? Solvent effects on the flow behavior of LCP solutions SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Tennessee, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Butler, Paul/D-7368-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 269-PMSE BP U897 EP U897 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002695 ER PT J AU Dai, PS Cebe, P Alamo, RG Mandelkern, L Capel, M AF Dai, PS Cebe, P Alamo, RG Mandelkern, L Capel, M TI Real-time SAXS study of crystallization of metallocene poly(propylene) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA. Florida State Univ, Dept Chem Engn, Tallahassee, FL 32306 USA. Florida State Univ, Inst Mol Biophys, Tallahassee, FL 32306 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 169-PMSE BP U864 EP U864 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002598 ER PT J AU Dair, BJ Thomas, EL Avgeropoulos, A Hadjichristidis, N Capel, M AF Dair, BJ Thomas, EL Avgeropoulos, A Hadjichristidis, N Capel, M TI Anisotropic deformation behavior of the cubic double gyroid phase in ABA elastomeric triblock copolymers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA. Univ Athens, Dept Chem, Athens 15771, Greece. Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RI Avgeropoulos, Apostolos/I-5772-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 076-PMSE BP U835 EP U835 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002505 ER PT J AU Dang, LX AF Dang, LX TI Molecular dynamics simulations with polarizable potential models SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 069-COMP BP U704 EP U704 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902091 ER PT J AU Danis, JA Eichhorn, BW Hawkins, HT Runde, WH AF Danis, JA Eichhorn, BW Hawkins, HT Runde, WH TI Hydrothermal synthesis of novel actinide phosphates SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Maryland, College Pk, MD 20742 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 008-NUCL BP U320 EP U320 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001038 ER PT J AU Davids, CN Woods, PJ Seweryniak, D Sonzogni, A Batchelder, JC Bingham, CR Davinson, T Henderson, DJ Irvine, RJ Poli, GL Uusitalo, J Walters, WB AF Davids, CN Woods, PJ Seweryniak, D Sonzogni, A Batchelder, JC Bingham, CR Davinson, T Henderson, DJ Irvine, RJ Poli, GL Uusitalo, J Walters, WB TI Deformed proton emitters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Argonne, IL 60439 USA. Univ Edinburgh, Edinburgh, Midlothian, Scotland. ORAU, UNIRIB, Oak Ridge, TN USA. Univ Tennessee, Knoxville, TN USA. Univ Milan, Milan, Italy. Univ Maryland, College Pk, MD 20742 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 023-NUCL BP U325 EP U325 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001053 ER PT J AU Davis, MJ AF Davis, MJ TI Hierarchical analysis of molecular spectra and intramolecular dynamics. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 474-PHYS BP U798 EP U798 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002403 ER PT J AU de Rege, FM Ott, KC Rau, JA Brown, GH Stuckey, GD Morey, M AF de Rege, FM Ott, KC Rau, JA Brown, GH Stuckey, GD Morey, M TI Influence of catalyst design and reaction parameters on the epoxidation of olefins with peroxides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 027-CATL BP U286 EP U286 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100870 ER PT J AU de Rege, FM Morita, DK Tumas, W Ott, KC AF de Rege, FM Morita, DK Tumas, W Ott, KC TI Transition metal catalysts supported on mesoporous materials SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 187-COLL BP U637 EP U637 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901872 ER PT J AU Devine, KK Lewis, JL Grant, PG Bench, GS AF Devine, KK Lewis, JL Grant, PG Bench, GS TI Quantitative particle induced x-ray emission imaging of rat olfactory epithelium applied to the permeability of rat epithelium to inhaled aluminum. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. Univ New Mexico, Ctr Populat Hlth, Albuquerque, NM 87131 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 066-TOXI BP U564 EP U564 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901636 ER PT J AU Dietz, ML Horwitz, EP AF Dietz, ML Horwitz, EP TI Applications of extraction chromatography in the development of radionuclide generators. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 046-IEC BP U926 EP U926 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902725 ER PT J AU Dietz, RN Senum, GI Fajer, RW Wieser, RF Rappolt, TJ AF Dietz, RN Senum, GI Fajer, RW Wieser, RF Rappolt, TJ TI New detectability in atmospheric perfluorocarbon tracing. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Tracer Env Sci & Tech Inc, San Marcos, CA 92069 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 078-ENVR BP U782 EP U782 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902298 ER PT J AU Ding, CF Wang, XB Wang, LS Wiley, WR AF Ding, CF Wang, XB Wang, LS Wiley, WR TI Photoelectron spectroscopy of multiply charged anions SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. Washington State Univ, Dept Phys, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 337-PHYS BP U759 EP U759 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002277 ER PT J AU Dixon, DA AF Dixon, DA TI Computational structure and spectroscopy of main group and transition metal fluorides and oxofluorides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 McMaster Univ, Hamilton, ON L8S 4L8, Canada. Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 032-FLUO BP U828 EP U828 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902442 ER PT J AU Dugger, MT Senft, DC Nelson, GC AF Dugger, MT Senft, DC Nelson, GC TI Friction and durability of chemisorbed organic lubricants for mems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 473-POLY BP U141 EP U141 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100470 ER PT J AU Duran, BL Ehler, DS Sauer, NN AF Duran, BL Ehler, DS Sauer, NN TI Extraction & segregation of uranium & lead from mixed waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 043-IEC BP U925 EP U925 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902722 ER PT J AU Dyer, RB Gai, F Rodriguez, HM Gregoret, LM AF Dyer, RB Gai, F Rodriguez, HM Gregoret, LM TI Fast folding/unfolding events in cold shock protein A. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 471-PHYS BP U797 EP U797 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002400 ER PT J AU Ehler, DS Duran, BL Sauer, N AF Ehler, DS Duran, BL Sauer, N TI Beryllium issues in the DARHT treatment process. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 002-TECH BP U542 EP U542 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901563 ER PT J AU Eisenberg, D Thompson, MJ Grothe, R Fischer, D Rice, DW Weiss, R AF Eisenberg, D Thompson, MJ Grothe, R Fischer, D Rice, DW Weiss, R TI 3D fold assignments of genome sequences. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Angeles, DOE, Lab Struct Biol & Mol Med, Los Angeles, CA 90095 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 039-PHYS BP U635 EP U635 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001984 ER PT J AU Evans, BR Zhou, J Poole, TL Bunick, GJ Palumbo, AV Woodward, J AF Evans, BR Zhou, J Poole, TL Bunick, GJ Palumbo, AV Woodward, J TI Extremozymes for bioprocessing. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Palumbo, Anthony/A-4764-2011 OI Palumbo, Anthony/0000-0002-1102-3975 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 206-BIOT BP U308 EP U309 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900856 ER PT J AU Fallon, P AF Fallon, P TI High-spin phenomena in nuclei. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 039-NUCL BP U329 EP U329 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001069 ER PT J AU Feldberg, SW Smalley, JF AF Feldberg, SW Smalley, JF TI Some implications of the distance dependence of heterogeneous electron transfer SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 164-ANYL BP U187 EP U187 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900505 ER PT J AU Fernandez, C Cinco, RM Sauer, K Yachandra, VK Klein, MP AF Fernandez, C Cinco, RM Sauer, K Yachandra, VK Klein, MP TI The S3 state of the Mn cluster: Structure from oriented psii membranes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Struct Biol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 436-INOR BP U130 EP U130 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000436 ER PT J AU Ferrance, JP Warzinski, RP Bockrath, B AF Ferrance, JP Warzinski, RP Bockrath, B TI The effect of catalyst, hydrogen pressure, and solvent in coal liquefaction under simulated preheater conditions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 136-FUEL BP U874 EP U874 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902576 ER PT J AU Free, SJ Moore, RC AF Free, SJ Moore, RC TI A thermodynamic model for lactate complexation with AM(III), Th(IV), Np(V) and U(VI) in concentrated SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 062-ENVR BP U777 EP U777 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902282 ER PT J AU Friedrich, DM Wang, Z Ainsworth, CC Gassman, PL Joly, AG AF Friedrich, DM Wang, Z Ainsworth, CC Gassman, PL Joly, AG TI Effect of leaving group lability on kinetics of organic anion sorption at aqueous mineral interfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 009-ENVR BP U759 EP U759 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902229 ER PT J AU Fukui, K Sumpter, BG Barnes, MD Noid, DW Otaigbe, JU AF Fukui, K Sumpter, BG Barnes, MD Noid, DW Otaigbe, JU TI Atomistic simulation and modeling of ultra fine polymer particles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 179-POLY BP U53 EP U53 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100178 ER PT J AU Garrett, JD AF Garrett, JD TI Probing the limits of nuclear stability with the new Holifield Radioactive Ion Beam Facility at ORNL. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 022-NUCL BP U324 EP U325 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001052 ER PT J AU Geiger, HC Chen, LH Perlstein, J Whitten, D AF Geiger, HC Chen, LH Perlstein, J Whitten, D TI Aggregation studies of styryl-naphthalene fatty acids and phospholipid derivatives: Factors controlling association. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Rochester, Ctr Photoinduced Charge Transfer, NSF, Rochester, NY 14627 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 453-PHYS BP U791 EP U791 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002383 ER PT J AU Georgiev, G Dai, PS Oyebode, E Cebe, P Capel, M AF Georgiev, G Dai, PS Oyebode, E Cebe, P Capel, M TI Real-time SAXS and thermal analysis study of multiple melting behavior in PEEK SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 176-PMSE BP U866 EP U866 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002605 ER PT J AU Gottesfeld, S AF Gottesfeld, S TI Computer simulation of fuel cell performance with impure fuel feed streams. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 165-ANYL BP U187 EP U187 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900506 ER PT J AU Gregorich, KE AF Gregorich, KE TI The Berkeley Gas-Filled Separator. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 040-NUCL BP U330 EP U330 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001070 ER PT J AU Haar, CM Nolan, SP Baker, RT Carter, CA Tumas, W AF Haar, CM Nolan, SP Baker, RT Carter, CA Tumas, W TI Fluoroalkylphosphine and hybrid alkyl-/fluoroalkylphosphine ligands for transition metal complexes SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. W Virginia Univ, Dept Chem, Morgantown, WV 26506 USA. RI Nolan, Steven/C-8465-2013 OI Nolan, Steven/0000-0001-9024-2035 NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 037-INOR BP U11 EP U11 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000038 ER PT J AU Hagaman, EW AF Hagaman, EW TI Cross-linking a soluble lignin by a coal demineralization treatment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 116-FUEL BP U868 EP U868 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902556 ER PT J AU Hamad, KS Roth, R Mizel, A van Buuren, T Chase, LL Cohen, M Alivisatos, AP AF Hamad, KS Roth, R Mizel, A van Buuren, T Chase, LL Cohen, M Alivisatos, AP TI Quantum confinement effects in colloidal inas nanocrystals studied by X-ray absorption spectroscopy SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Phys, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94564 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 155-COLL BP U628 EP U628 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901840 ER PT J AU Harbottle, G Holmes, L AF Harbottle, G Holmes, L TI In the steps of William the Conqueror with INAA. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 064-NUCL BP U336 EP U336 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001093 ER PT J AU Hay, BP AF Hay, BP TI A "points-on-a-sphere" approach to model metal-ligand interactions with an extended MM3 model. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Theory Modeling & Simulat Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 054-COMP BP U700 EP U700 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902076 ER PT J AU Henderson, MA Joyce, SA Rustad, JR AF Henderson, MA Joyce, SA Rustad, JR TI Probing the effect of surface reduction on the structure and chemistry of hematite surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 200-PHYS BP U717 EP U717 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002142 ER PT J AU Henry, EA Archer, DE Younes, W Becker, JA Nelson, RO AF Henry, EA Archer, DE Younes, W Becker, JA Nelson, RO TI Lu(N,XN) cross section measurements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 043-NUCL BP U331 EP U331 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001073 ER PT J AU Hess, AC AF Hess, AC TI The geometric, electronic and magnetic properties of oxide surface using first principles solid state quantum mechanical methods. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 049-PHYS BP U638 EP U638 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001994 ER PT J AU Ho, PC Palmer, DA AF Ho, PC Palmer, DA TI Ion association of dilute aqueous electrolyte solutions to 600 degrees C and 300MPa by electrical conductance measurements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 020-IEC BP U918 EP U918 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902699 ER PT J AU Hoffman, DC Lee, DM AF Hoffman, DC Lee, DM TI Women in nuclear chemistry - An extraordinary heritage. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 034-HIST BP U903 EP U903 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902664 ER PT J AU Holman, HYN Perry, DL Goldman, S Martin, MC McKinney, WR AF Holman, HYN Perry, DL Goldman, S Martin, MC McKinney, WR TI Application of synchrotron infrared microspectroscopy to the study of chromium-biomolecule interactions at the bacterial-mineral interface SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Holman, Hoi-Ying/N-8451-2014 OI Holman, Hoi-Ying/0000-0002-7534-2625 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 371-INOR BP U109 EP U109 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000372 ER PT J AU Horwitz, EP Hines, J Chiarizia, R Dietz, ML AF Horwitz, EP Hines, J Chiarizia, R Dietz, ML TI A generator for the production of Bi-213 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 048-IEC BP U926 EP U926 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902727 ER PT J AU Hsu, PC Hipple, DL Squire, DV Ford, TD Foster, KG Soto, GT Adamson, MG AF Hsu, PC Hipple, DL Squire, DV Ford, TD Foster, KG Soto, GT Adamson, MG TI Molten salt oxidation for hazardous waste treatment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 125-IEC BP U948 EP U948 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902803 ER PT J AU Huang, J Lisowski, MS Runt, J Hall, ES Kean, RT Buehler, N Lin, JS AF Huang, J Lisowski, MS Runt, J Hall, ES Kean, RT Buehler, N Lin, JS TI Crystallization and microstructure of poly(L-lactide-co-meso-lactide) copolymers SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA. Cargill Inc, Cent Res & EcoPLA, Minneapolis, MN 55440 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 035-POLY BP U12 EP U12 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100036 ER PT J AU Huber, VJ Bond, AH Chiarizia, R Dietz, ML AF Huber, VJ Bond, AH Chiarizia, R Dietz, ML TI An improved synthesis of individual dicyclohexano crown isomers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 023-IEC BP U919 EP U919 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902702 ER PT J AU Janata, J AF Janata, J TI The chemical legacy of the Manhattan Project. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA. Pacific NW Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 017-HIST BP U899 EP U899 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902647 ER PT J AU Jensen, MP AF Jensen, MP TI Thermodynamics of dioxoneptunium(V) complexation by dicarboxylic acids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 085-NUCL BP U342 EP U343 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001114 ER PT J AU Jensen, MP AF Jensen, MP TI Nickel extraction by P,P '-di(2-ethylhexyl)methane diphosphonic acid. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 025-IEC BP U920 EP U920 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902704 ER PT J AU Ji, HF Dabestani, R Brown, G AF Ji, HF Dabestani, R Brown, G TI Fluorescent probes for the detection of potassium ions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 140-PHYS BP U699 EP U699 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002083 ER PT J AU Josephsohn, NS Morita, DK Pesiri, DR Tumas, W AF Josephsohn, NS Morita, DK Pesiri, DR Tumas, W TI Palladium catalyzed cross coupling reactions in dense phase fluids: Dimethyl ether as a polar alternative to CO2. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 083-INOR BP U24 EP U24 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000084 ER PT J AU Kaminski, MD Nunez, L AF Kaminski, MD Nunez, L TI Extractant-coated magnetic microparticles - Application to industrial waste minimization. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 083-IEC BP U937 EP U937 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902761 ER PT J AU Kaszuba, JP Runde, WH Janecky, DR Tait, CD AF Kaszuba, JP Runde, WH Janecky, DR Tait, CD TI Thermodynamic modeling of geochemical reactions of neptunium. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 064-ENVR BP U777 EP U777 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902284 ER PT J AU Kerr, JB Rabbi, F Stringfellow, W Clarke, R AF Kerr, JB Rabbi, F Stringfellow, W Clarke, R TI Electrokinetic effects on bioremediation of metal ion and organic pollutants in soil. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Geokinet Int, Berkeley, CA 94710 USA. RI Stringfellow, William/O-4389-2015 OI Stringfellow, William/0000-0003-3189-5604 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 059-IEC BP U929 EP U930 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902738 ER PT J AU Kirkby, SJ Frei, H AF Kirkby, SJ Frei, H TI Photo-assisted highly selective chlorination of benzene by chlorine in NaZSM-5. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, MS Calvin Lab, Phys Biosci Div, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 288-PHYS BP U744 EP U744 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002228 ER PT J AU Konze, WV Kubas, GJ Scott, BL AF Konze, WV Kubas, GJ Scott, BL TI From BArF to Ar-F: First example of B-C bond cleavage in the BArF (B[C6H3(3,5-CF3)(2)]4) anion by a cationic transition metal complex. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 093-INOR BP U27 EP U27 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000094 ER PT J AU Krishnan, M Nghiem, NP Davison, BH AF Krishnan, M Nghiem, NP Davison, BH TI Fuel ethanol production in a fluidized-bed bioreactor using immobilized biocatalysts. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Davison, Brian/D-7617-2013 OI Davison, Brian/0000-0002-7408-3609 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 209-BIOT BP U309 EP U310 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900859 ER PT J AU Kung, CY Barnes, MD Sumpter, BG Noid, DW AF Kung, CY Barnes, MD Sumpter, BG Noid, DW TI Production of monodisperse polymer nanoparticles from solution SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ, Dept Mat Sci, Ames, IA 50011 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 178-POLY BP U53 EP U53 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100177 ER PT J AU Lagomarsino, RJ AF Lagomarsino, RJ TI Perfluorocarbon compounds as atmospheric tracers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US Dept Energy, Environm Measurements Lab, New York, NY 10014 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 077-ENVR BP U782 EP U782 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902297 ER PT J AU Laue, CA Gregorich, KE Sudowe, R Hendricks, MB Adams, JL Lane, MR Lee, DM McGrath, CA Shaughnessy, DA Strellis, DA Sylwester, ER Wilk, PA Hoffman, DC AF Laue, CA Gregorich, KE Sudowe, R Hendricks, MB Adams, JL Lane, MR Lee, DM McGrath, CA Shaughnessy, DA Strellis, DA Sylwester, ER Wilk, PA Hoffman, DC TI First evidence of new isotope, PU-231 - Production and characterization. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 LBNL, Berkeley, CA 94720 USA. RI McGrath, Christopher/E-8995-2013 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 042-NUCL BP U330 EP U330 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001072 ER PT J AU Le, QT Ehler, DS Sauer, NN AF Le, QT Ehler, DS Sauer, NN TI Chelating water-soluble polymers for extraction and separation of beryllium and other metal ions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 044-IEC BP U925 EP U925 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902723 ER PT J AU Lee, YW Johal, MS Parikh, AN Foster, L Robinson, JM McBranch, DW Li, D AF Lee, YW Johal, MS Parikh, AN Foster, L Robinson, JM McBranch, DW Li, D TI An SHG study of L-B films from 4-eicosyl-oxo-(E)-stilbazolium iodide. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RI PARIKH, ATUL/D-2243-2014 OI PARIKH, ATUL/0000-0002-5927-4968 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 145-COLL BP U625 EP U625 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901830 ER PT J AU Leeson, DT Wiersma, DA AF Leeson, DT Wiersma, DA TI Exploring protein energy landscapes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87544 USA. Univ Groningen, Dept Chem, Ultrafast Laser & Spect Lab, NL-9747 AG Groningen, Netherlands. Univ Groningen, Ctr Mat Sci, NL-9747 AG Groningen, Netherlands. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 391-PHYS BP U773 EP U773 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002324 ER PT J AU Li, J Fritz, JS AF Li, J Fritz, JS TI Capillary electrophoresis separation of neutral compounds in non-aqueous media SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 098-ANYL BP U168 EP U168 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900440 ER PT J AU Li, ZZ Silks, LA LeMaster, DM AF Li, ZZ Silks, LA LeMaster, DM TI A convenient synthesis of thieno-, seleno[2,3-B] pyrroles from 1-triisopropylsilylpyrrole. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Biosci & Biotechnol Grp, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 730-ORGN BP U589 EP U589 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001854 ER PT J AU Lin, MR Paviet-Hartmann, P Xu, Y Tait, CD Runde, WH AF Lin, MR Paviet-Hartmann, P Xu, Y Tait, CD Runde, WH TI Uranyl(VI) compounds in NACL solutions: Structure, solubility, and thermodynamics. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87544 USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 065-ENVR BP U778 EP U778 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902285 ER PT J AU Lugo, JL Ford, D Wedman, D Trujilo, V Martinez, HE AF Lugo, JL Ford, D Wedman, D Trujilo, V Martinez, HE TI Glovebox decontamination by an electrolytic method. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 009-TECH BP U544 EP U544 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901570 ER PT J AU Makarova, O Norris, JR Meisel, D AF Makarova, O Norris, JR Meisel, D TI Fluorescent probes in silica nanobubbles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Chicago, Dept Chem, Chicago, IL 60637 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 075-MTLS BP U347 EP U348 PN 3 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235101060 ER PT J AU Marr, AJ Chang, BC Sears, TJ AF Marr, AJ Chang, BC Sears, TJ TI Near infrared frequency modulated diode laser absorption spectroscopy of methylene. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 346-PHYS BP U762 EP U762 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002286 ER PT J AU Mathews, JP Hatcher, PG Eser, S Walsh, PM Scaroni, AW AF Mathews, JP Hatcher, PG Eser, S Walsh, PM Scaroni, AW TI Time-temperature histories of bituminous coal particles in a drop-tube reactor. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Penn State Univ, Fuel Sci Program, University Pk, PA 16802 USA. Penn State Univ, Energy Inst, University Pk, PA 16802 USA. Sandia Natl Labs, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 007-FUEL BP U834 EP U834 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902454 ER PT J AU McCusker, JK Curtright, A Frei, H Damrauer, NH AF McCusker, JK Curtright, A Frei, H Damrauer, NH TI Dynamics of electronic excited states in low-symmetry Ru(II) polypyridyl complexes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 559-INOR BP U169 EP U169 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000559 ER PT J AU McDonald, MJ Bourcier, SC Carson, SD Naranjo, G Talley, D Wemple, J AF McDonald, MJ Bourcier, SC Carson, SD Naranjo, G Talley, D Wemple, J TI Challenges of extracting and purifying fission produced molybdenum-99. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 003-IEC BP U913 EP U913 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902682 ER PT J AU McMahon, BH Stojkovic, BP Frauenfelder, H Hay, PJ Martin, RL Garcia, A AF McMahon, BH Stojkovic, BP Frauenfelder, H Hay, PJ Martin, RL Garcia, A TI Ab-initio calculation of heme - CO interaction potential. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 031-BIOL BP U214 EP U214 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900588 ER PT J AU McNichol, AP Ertel, JR Eglinton, TI Benitez-Nelson, B AF McNichol, AP Ertel, JR Eglinton, TI Benitez-Nelson, B TI The radiocarbon content of individual lignin-derived phenols - Tracing terrestrial carbon in the marine environment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 081-NUCL BP U341 EP U341 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001110 ER PT J AU Meade, RA AF Meade, RA TI Chemistry at Los Alamos. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Arch Program, Los Alamos, NM 87544 USA. Univ Calif Los Alamos Natl Lab, Hist Program, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 016-HIST BP U899 EP U899 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902646 ER PT J AU Meisel, D Makarova, O Norris, JR AF Meisel, D Makarova, O Norris, JR TI Fluorescent probes in silica nanobubbles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Chicago, Dept Chem, Chicago, IL 60637 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 043-MTLS BP U338 EP U338 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235101030 ER PT J AU Melnichenko, YB Wignall, GD Van Hook, WA AF Melnichenko, YB Wignall, GD Van Hook, WA TI The phase diagram of polymer solutions below the theta temperature from sans. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 138-PMSE BP U854 EP U854 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002567 ER PT J AU Micic, OI Jones, KM Nozik, AJ AF Micic, OI Jones, KM Nozik, AJ TI Properties of individual and close-packed arrays of InP quantum dots. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 046-MTLS BP U339 EP U339 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235101033 ER PT J AU Miller, SE Marsh, EM Svec, WA Debreczeny, MP Wasielewski, MR AF Miller, SE Marsh, EM Svec, WA Debreczeny, MP Wasielewski, MR TI Effects of bridge energetics on charge separation and recombination rates in aromatic imide-based Donor-Bridge-Acceptor systems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 132-PHYS BP U697 EP U697 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002075 ER PT J AU Mirzadeh, S AF Mirzadeh, S TI Recent medical applications of radium isotopes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 052-NUCL BP U333 EP U333 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001081 ER PT J AU Mirzadeh, S Du, MT Alexander, CW Knapp, FF AF Mirzadeh, S Du, MT Alexander, CW Knapp, FF TI Thermochromatographic separation of medical radioisotopes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 013-IEC BP U916 EP U916 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902692 ER PT J AU Moller, P AF Moller, P TI Nuclear shapes in fission and fusion. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 004-NUCL BP U319 EP U319 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001034 ER PT J AU Morgan, AN Burns, CJ Schake, AR Warner, BP AF Morgan, AN Burns, CJ Schake, AR Warner, BP TI Redox behavior and ligand affinities of plutonium and neptunium. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 204-INOR BP U60 EP U60 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000205 ER PT J AU Morss, LR AF Morss, LR TI The chemical behavior of neptunium and its importance in nuclear waste disposition. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 093-NUCL BP U345 EP U345 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001122 ER PT J AU Mukerjee, S Lee, SJ Ticianelli, EA McBreen, J AF Mukerjee, S Lee, SJ Ticianelli, EA McBreen, J TI Enhanced CO tolerance by carbon supported PtMo electrocatalyst for proton exchange membrane fuel cells: In situ investigation by synchrotron based x-ray absorption spectroscopy SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. RI Ticianelli, Edson/D-1560-2012 OI Ticianelli, Edson/0000-0003-3432-2799 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 002-CATL BP U279 EP U279 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100848 ER PT J AU Munoz-Galarza, JO Marshall, CL Brenner, JR AF Munoz-Galarza, JO Marshall, CL Brenner, JR TI Role of MoS2 in catalysts used in the hydrodesulfurization of high-sulfur-containing heavy oils. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Puerto Rico, Dept Chem Engn, Mayaguez, PR 00861 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 072-PRES BP U229 EP U229 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100700 ER PT J AU Myneni, SCB Brown, JT Meyer-Ilse, W Martinez, GA Hussain, Z Warwick, A AF Myneni, SCB Brown, JT Meyer-Ilse, W Martinez, GA Hussain, Z Warwick, A TI Applications of soft X-rays in probing the chemistry of natural organic molecules. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Univ Puerto Rico, Agr Expt Stn, San Juan, PR 00936 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 005-ENVR BP U758 EP U758 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902225 ER PT J AU Narla, M Knowles, DW Gimm, JA Chasis, JA Evans, EA AF Narla, M Knowles, DW Gimm, JA Chasis, JA Evans, EA TI Fluorescence-imaged microdeformation: Insights into structural organization of red cell membrane. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 320-COLL BP U676 EP U676 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902004 ER PT J AU Nash, KL AF Nash, KL TI Kinetics of actinide reactions: Contributions of James C. Sullivan. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 069-NUCL BP U338 EP U338 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235001098 ER PT J AU Nozik, AJ Bertram, D Micic, O AF Nozik, AJ Bertram, D Micic, O TI Optical spectroscopy of InP and GaAs quantum dots. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 228-PHYS BP U727 EP U727 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002170 ER PT J AU Nozik, AJ Micic, OI Bertram, D Hanna, M AF Nozik, AJ Micic, OI Bertram, D Hanna, M TI Spectroscopic and electronic properties of III-V semiconductor quantum dots SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 037-MTLS BP U337 EP U337 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235101024 ER PT J AU Ohzono, T Fujihira, M Glosli, JN AF Ohzono, T Fujihira, M Glosli, JN TI Molecular dynamics simulations of friction in ordered organic monolayers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tokyo Inst Technol, Dept Biomol Engn, Midori Ku, Yokohama, Kanagawa 2268501, Japan. Univ Calif Lawrence Livermore Natl Lab, Dept Phys, H Div, Livermore, CA 94550 USA. RI Ohzono, Takuya/M-5400-2016 OI Ohzono, Takuya/0000-0003-2185-2504 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 066-PHYS BP U644 EP U644 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002011 ER PT J AU Omberg, KM Schoonover, JR Meyer, TJ AF Omberg, KM Schoonover, JR Meyer, TJ TI Application of TRIR to electronic structure. Metal-to-ligand charge transfer (MLCT) excited states. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Chapel Hill, NC 27599 USA. Univ Calif Los Alamos Natl Lab, Biosci & Biotechnol Grp, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RI Omberg, Kristin/I-5972-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 563-INOR BP U170 EP U170 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000563 ER PT J AU Orler, EB Wrobleski, DA Smith, ME AF Orler, EB Wrobleski, DA Smith, ME TI The influence of hydrolytic degradation on the mechanical properties of a poly(ester urethane). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Polymer & Coatings Grp, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 374-POLY BP U111 EP U111 PN 3 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WZ UT WOS:000075235100371 ER PT J AU Padro, CEG AF Padro, CEG TI The road to the hydrogen future: R & D in the USDOE hydrogen program. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Washington, DC 20585 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 022-FUEL BP U839 EP U839 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234902466 ER PT J AU Palmer, PD Clark, DL Conradson, SD Keogh, DW Neu, MP Reilly, SD Runde, W Tait, CD AF Palmer, PD Clark, DL Conradson, SD Keogh, DW Neu, MP Reilly, SD Runde, W Tait, CD TI Neptunyl chemistry under alkaline conditions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 003-TECH BP U542 EP U542 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234901564 ER PT J AU Parikh, AN Gillmor, SD Bardeau, JF Swanson, BI Schivley, MA Allara, DL AF Parikh, AN Gillmor, SD Bardeau, JF Swanson, BI Schivley, MA Allara, DL TI Temperature-induced, structural reconstructions in chain-organized microstructures. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA. RI PARIKH, ATUL/D-2243-2014 OI PARIKH, ATUL/0000-0002-5927-4968 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 002-ANYL BP U142 EP U142 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900351 ER PT J AU Patterson, HH Yersin, H Trumbach, D Strasser, J Assefa, Z AF Patterson, HH Yersin, H Trumbach, D Strasser, J Assefa, Z TI Photoluminescence study of tunable radiationless energy transfer in the layered solid, Eu[Au(CN)(2)](3) 3H(2)O by variation of temperature and pressure. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Maine, Dept Chem, Orono, ME 04469 USA. Univ Regensburg, Inst Phys & Theoret Chem, D-93040 Regensburg, Germany. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 588-INOR BP U178 EP U178 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000588 ER PT J AU Pavski, V Gao, D Yeung, ES AF Pavski, V Gao, D Yeung, ES TI Reusable uncoated capillary arrays for multiplexed DNA sequencing. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. US DOE, Ames Lab, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 058-ANYL BP U156 EP U157 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WX UT WOS:000075234900400 ER PT J AU Peters, DW Power, MP Bourret, ED Arnold, J AF Peters, DW Power, MP Bourret, ED Arnold, J TI Alkylgallium hydrazine complexes: Rings and cages en route to gallium nitride. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 031-INOR BP U10 EP U10 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000032 ER PT J AU Peters, RG Warner, BP Burns, CJ AF Peters, RG Warner, BP Burns, CJ TI Catalytic reactions of novel organouranium complexes: Involvement of F-orbitals during reactivity. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 587-INOR BP U177 EP U178 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235000587 ER PT J AU Peterson, KA Bowman, JM AF Peterson, KA Bowman, JM TI Accurate rovibrational calculations for HOCl molecule. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Emory Univ, Dept Chem, Atlanta, GA 30322 USA. Emory Univ, Cherry L Emerson Ctr Sci Computat, Atlanta, GA 30322 USA. Washington State Univ, Dept Chem, Pullman, WA 99164 USA. Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1998 VL 216 MA 496-PHYS BP U804 EP U805 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 107WY UT WOS:000075235002425 ER EF