FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Aspinwall, CA Yeung, ES AF Aspinwall, CA Yeung, ES TI Screening populations of individual cells for secretory heterogeneity SO ANALYTICAL AND BIOANALYTICAL CHEMISTRY LA English DT Article DE imaging; cells; bioanalysis; chemiluminescence ID PANCREATIC BETA-CELLS; CHROMAFFIN CELLS; ATP RELEASE; EXOCYTOSIS; MICROSCOPY; GRANULES; STORAGE AB Many common metabolic and neurological disorders are related to defective regulation of exocytosis at the level of single cells. In exocytosis, vesicles containing the secretory product of a given cell type fuse with the plasma membrane allowing release of the vesicular contents into the extracellular environment where the physiological action can be exerted. The typical secretory vesicle contains between 0.15 and 10 attomoles of material that is released on a millisecond timescale. Hence, detection of this process presents several chemical and analytical challenges. In this work, we utilize the native ATP, stored at high concentrations within the secretory vesicles of most neuroendocrine cells and co-released during exocytosis and during cell lysis, as a universal tracer of cellular secretion events. Organisms studied include pancreatic islets, mast cells, and Escherischia coli. Cellular processes investigated include exocytotic release, stimulated cell lysis, and programmed cell lysis. C1 Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Yeung, ES (reprint author), Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. EM yeung@ameslab.gov OI Aspinwall, Craig/0000-0002-4359-5812 NR 22 TC 6 Z9 6 U1 0 U2 1 PU SPRINGER HEIDELBERG PI HEIDELBERG PA TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY SN 1618-2642 J9 ANAL BIOANAL CHEM JI Anal. Bioanal. Chem. PD FEB PY 2005 VL 381 IS 3 BP 660 EP 666 DI 10.1007/s00216-004-2981-7 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 907EE UT WOS:000227697400018 PM 15609009 ER PT J AU VerBerkmoes, NC Hervey, WJ Shah, M Land, M Hauser, L Larimer, FW Van Berkel, GJ Goeringer, DE AF VerBerkmoes, NC Hervey, WJ Shah, M Land, M Hauser, L Larimer, FW Van Berkel, GJ Goeringer, DE TI Evaluation of "Shotgun" proteomics for identification of biological threat agents in complex environmental matrixes: Experimental simulations SO ANALYTICAL CHEMISTRY LA English DT Article ID TANDEM MASS-SPECTROMETRY; COMPLETE GENOME SEQUENCE; ESCHERICHIA-COLI; SHEWANELLA-ONEIDENSIS; RAPID IDENTIFICATION; BACILLUS-ANTHRACIS; PROTEIN DATABASE; WHOLE CELLS; TOP-DOWN; MIXTURES AB There is currently a great need for rapid detection and positive identification of biological threat agents, as well as microbial species in general, directly from complex environmental samples. This need is most urgent in the area of homeland security, but also extends into medical, environmental, and agricultural sciences. Mass-spectrometry-based analysis is one of the leading technologies in the field with a diversity of different methodologies for biothreat detection. Over the past few years, "shotgun" proteomics has become one method of choice for the rapid analysis of complex protein mixtures by mass spectrometry. Recently, it was demonstrated that this methodology is capable of distinguishing a target species against a large database of background species from a single-component sample or dual-component mixtures with relatively the same concentration (Dworzanski, J. P.; Snyder, A. P.; Chen, R.; Zhang, H.; Wishart, D.; U, L. AnaL Chem. 2004, 76, 2355-2366). Here, we examine the potential of shotgun proteomics to analyze a target species in a background of four contaminant species. We tested the capability of a common commercial mass-spectrometry-based shotgun proteomics platform for the detection of the target species (Escherichia coli) at four different concentrations and four different time points of analysis. We also tested the effect of database size on positive identification of the four microbes used in this study by testing a small (13-species) database and a large (261-species) database. The results clearly indicated that this technology could easily identify the target species at 20% in the background mixture at a 60, 120, 180, or 240 min analysis time with the small database. The results also indicated that the target species could easily be identified at 20% or 6% but could not be identified at 0.6% or 0.06% in either a 240 min analysis or a 30 h analysis with the small database. The effects of the large database were severe on the target species where detection above the background at any concentration used in this study was impossible, though the three other microbes used in this study were clearly, identified above the background when analyzed with the large database. This study points to the potential application of this technology for biological threat agent detection but highlights many areas of needed research before the technology will be useful in real world samples. C1 Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. Univ Tennessee, Oak Ridge Natl Lab, Grad Sch Genome Sci & Technol, Oak Ridge, TN 37830 USA. RP Goeringer, DE (reprint author), Oak Ridge Natl Lab, Div Chem Sci, POB 2008, Oak Ridge, TN 37831 USA. EM goeringerde@ornl.gov RI Hauser, Loren/H-3881-2012; Land, Miriam/A-6200-2011 OI Land, Miriam/0000-0001-7102-0031 NR 38 TC 22 Z9 24 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 1 PY 2005 VL 77 IS 3 BP 923 EP 932 DI 10.1021/ac049127n PG 10 WC Chemistry, Analytical SC Chemistry GA 893ZG UT WOS:000226759000034 PM 15679362 ER PT J AU Palmblad, M Bench, G Vogel, JS AF Palmblad, M Bench, G Vogel, JS TI Mass by energy loss quantitation as a practical submicrogram balance SO ANALYTICAL CHEMISTRY LA English DT Letter AB A simple device integrating a thin film support and a standard microcentrifuge tube can be used for making solutions of accurately known concentration of any organic compound in a single step, avoiding serial dilution and the use of microgram balances. Nanogram to microgram quantities of organic material deposited on the thin film are quantified by ion energy loss and transferred to the microcentrifuge tube with high recovery. C1 Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RP Palmblad, M (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. EM palmblad1@llnl.gov RI Palmblad, Magnus/B-8649-2016 OI Palmblad, Magnus/0000-0002-5865-8994 FU NCRR NIH HHS [RR-13461] NR 2 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 1 PY 2005 VL 77 IS 3 BP 952 EP 953 DI 10.1021/ac048560u PG 2 WC Chemistry, Analytical SC Chemistry GA 893ZG UT WOS:000226759000039 PM 15679367 ER PT J AU Davalos, RV Mir, LM Rubinsky, B AF Davalos, RV Mir, LM Rubinsky, B TI Tissue ablation with irreversible electroporation SO ANNALS OF BIOMEDICAL ENGINEERING LA English DT Article DE electropermeabilization; cancer therapy; bioheat equation ID ELECTRICAL-IMPEDANCE TOMOGRAPHY; GENE DELIVERY; ELECTROCHEMOTHERAPY; MEMBRANES; BREAKDOWN; FIELDS; TUMORS; CELLS; CRYOSURGERY; BLEOMYCIN AB This study introduces a new method for minimally invasive treatment of cancer - the ablation of undesirable tissue through the use of irreversible electroporation. Electroporation is the permeabilization of the cell membrane due to an applied electric field. As a function of the field amplitude and duration, the permeabilization can be reversible or irreversible. Over the last decade, reversible electroporation has been intensively pursued as a very promising technique for the treatment of cancer. It is used in combination with cytotoxic drugs, such as bleomycin, in a technique known as electrochemotherapy. However, irreversible electroporation was completely ignored in cancer therapy. We show through mathematical analysis that irreversible electroporation can ablate substantial volumes of tissue, comparable to those achieved with other ablation techniques, without causing any detrimental thermal effects and without the need of adjuvant drugs. This study suggests that irreversible electroporation may become an important and innovative tool in the armamentarium of surgeons treating cancer. C1 Sandia Natl Labs, Livermore, CA 94550 USA. Inst Gustave Roussy, CNRS, UMR 8121, Villejuif, France. Univ Calif Berkeley, Dept Mech Engn, Biomed Engn Lab, Berkeley, CA 94720 USA. RP Davalos, RV (reprint author), Sandia Natl Labs, 7011 East Ave,MS 9036, Livermore, CA 94550 USA. EM rvdaval@sandia.gov RI Rubinsky, Boris/B-4439-2010; Davalos, Rafael/F-9012-2011; Sano, Michael/E-1715-2011 OI Rubinsky, Boris/0000-0002-2794-1543; FU NCRR NIH HHS [R01-RR018961] NR 44 TC 412 Z9 430 U1 2 U2 54 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0090-6964 J9 ANN BIOMED ENG JI Ann. Biomed. Eng. PD FEB PY 2005 VL 33 IS 2 BP 223 EP 231 DI 10.1007/s10439-005-8981-8 PG 9 WC Engineering, Biomedical SC Engineering GA 899RO UT WOS:000227162700011 PM 15771276 ER PT J AU Abboud, R Popa, R Souza-Egipsy, V Giometti, CS Tollaksen, S Mosher, JJ Findlay, RH Nealson, KH AF Abboud, R Popa, R Souza-Egipsy, V Giometti, CS Tollaksen, S Mosher, JJ Findlay, RH Nealson, KH TI Low-temperature growth of Shewanella oneidensis MR-1 SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID 2-DIMENSIONAL ELECTROPHORESIS; GEL-ELECTROPHORESIS; TISSUE PROTEINS; CELL FRACTIONS; QUANTITATION; MUTANT; SERUM AB Shewanella oneidensis MR-1 is a mesophilic bacterium with a maximum growth temperature of approximate to35degreesC but the ability to grow over a wide range of temperatures, including temperatures near zero. At room temperature (approximate to22degreesC) MR-1 grows with a doubling time of about 40 min, but when moved from 22degreesC to 3degreesC, MR-1 cells display a very long lag phase of more than 100 h followed by very slow growth, with a doubling time of approximate to67 h. In comparison to cells grown at 22degreesC, the cold-grown cells formed long, motile filaments, showed many spheroplast-like structures, produced an array of proteins not seen at higher temperature, and synthesized a different pattern of cellular lipids. Frequent pilus-like structures were observed during the transition from 3 to 22degreesC. C1 Univ So Calif, Dept Biol Sci, Los Angeles, CA 90089 USA. Argonne Natl Lab, Div Biosci, Argonne, IL 60439 USA. Univ Alabama, Dept Biol Sci, Tuscaloosa, AL USA. CSIC, INTA, Ctr Astrobiol, Madrid, Spain. RP Popa, R (reprint author), Univ So Calif, Dept Biol Sci, 3651 Trousdale Pkwy,AHF 107, Los Angeles, CA 90089 USA. EM rpopa@usc.edu RI Findlay, Robert/G-4223-2011; souza-egipsy, virginia/L-8389-2014 OI souza-egipsy, virginia/0000-0002-9690-9889 NR 27 TC 48 Z9 49 U1 0 U2 15 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD FEB PY 2005 VL 71 IS 2 BP 811 EP 816 DI 10.1128/AEM.71.2.811-816.2005 PG 6 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA 897YS UT WOS:000227043400028 PM 15691935 ER PT J AU Devine, KD Boman, EG Heaphy, RT Hendrickson, BA Teresco, JD Faik, J Flaherty, JE Gervasio, LG AF Devine, KD Boman, EG Heaphy, RT Hendrickson, BA Teresco, JD Faik, J Flaherty, JE Gervasio, LG TI New challenges in dynamic load balancing SO APPLIED NUMERICAL MATHEMATICS LA English DT Article; Proceedings Paper CT Conference on Adaptive Methods for Partial Differential Equations and Large-Scale Computation (ADAPT 03) CY 2003 CL Rensselaer Polytech Inst, Troy, NY HO Rensselaer Polytech Inst DE dynamic load balancing; partitioning; zoltan; geometric partitioning; hypergraph; resource-aware load balancing ID PARALLEL; ALGORITHMS; MULTIPROCESSORS; DECOMPOSITION; MODELS AB Data partitioning and load balancing are important components of parallel computations. Many different partitioning strategies have been developed, with great effectiveness in parallel applications. But the load-balancing problem is not yet solved completely; new applications and architectures require new partitioning features. Existing algorithms must be enhanced to support more complex applications. New models are needed for non-square, non-symmetric, and highly connected systems arising from applications in biology, circuits, and materials simulations. Increased use of heterogeneous computing architectures requires partitioners that account for non-uniform computing, network, and memory resources. And, for greatest impact, these new capabilities must be delivered in toolkits that are robust, easy-to-use, and applicable to a wide range of applications. In this paper, we discuss our approaches to addressing these issues within the Zoltan Parallel Data Services toolkit. (C) 2004 IMACS. Published by Elsevier B.V. All rights reserved. C1 Sandia Natl Labs, Discrete Algorithms & Math Dept, Albuquerque, NM 87185 USA. Williams Coll, Dept Comp Sci, Williamstown, MA 01267 USA. Rensselaer Polytech Inst, Dept Comp Sci, Troy, NY 12180 USA. RP Sandia Natl Labs, Discrete Algorithms & Math Dept, POB 5800, Albuquerque, NM 87185 USA. EM kddevin@sandia.gov NR 70 TC 54 Z9 64 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 EI 1873-5460 J9 APPL NUMER MATH JI Appl. Numer. Math. PD FEB PY 2005 VL 52 IS 2-3 BP 133 EP 152 DI 10.1016/j.apnum.2004.08.028 PG 20 WC Mathematics, Applied SC Mathematics GA 886IK UT WOS:000226220200002 ER PT J AU Lehman, JH Engtrakul, C Gennett, T Dillon, AC AF Lehman, JH Engtrakul, C Gennett, T Dillon, AC TI Single-wall carbon nanotube coating on a pyroelectric detector SO APPLIED OPTICS LA English DT Article ID OPTICAL-PROPERTIES; BLACK COATINGS; SEPARATION; RADIATION AB Carbon single-wall nanotubes (SWNTs) are studied as the thermal-absorption coating on a large area pyroelectric detector. The SWNTs were produced by a laser vaporization method and dispersed onto the detector surface by use of a simple airbrush technique. The detector was based on a 1-cm-diameter, 60-mum-thick lithium tantalate disk having nickel electrodes. We report the spectral responsivity of the detector ranging from 600 to 1800 nm, as well as the spatial and directional uniformity at 850 nm. Using Drude and Lorentzian dielectric functions and an effective medium approximation to obtain the indices of refraction of semiconductor and metallic SWNTs, we compared the expected theoretical relative responsivity for the two types of tube with the measured relative responsivity of the detector. Values of thermal conductivity, specific heat, and damage threshold obtained from the literature are compared with properties of alternatives for thermal coatings such as gold-black and carbon-based paint. C1 Natl Inst Stand & Technol, Sources Detectors & Displays Grp, Boulder, CO 80305 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Lehman, JH (reprint author), Natl Inst Stand & Technol, Sources Detectors & Displays Grp, 325 Broadway, Boulder, CO 80305 USA. EM lehman@boulder.nist.gov RI Engtrakul, Chaiwat/H-5634-2011 NR 31 TC 50 Z9 50 U1 1 U2 13 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1559-128X EI 2155-3165 J9 APPL OPTICS JI Appl. Optics PD FEB 1 PY 2005 VL 44 IS 4 BP 483 EP 488 DI 10.1364/AO.44.000483 PG 6 WC Optics SC Optics GA 894UZ UT WOS:000226818400001 PM 15726942 ER PT J AU Zeng, X Mao, XL Greif, R Russo, RE AF Zeng, X Mao, XL Greif, R Russo, RE TI Experimental investigation of ablation efficiency and plasma expansion during femtosecond and nanosecond laser ablation of silicon SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID FUSED-SILICA; ENERGY DEPOSITION; CAVITIES; TEMPERATURE; PULSES AB Femtosecond laser (Ti:sapphire, 100 fs pulse duration) ablation of silicon in air was compared with nanosecond laser (Nd:YAG, 3 ns pulse duration) ablation at ultraviolet wavelength (266 nm). Laser ablation efficiency was studied by measuring crater depth as a function of pulse number. For the same number of laser pulses, the fs-ablated crater was about two times deeper than the ns-crater. The temperature and electron number density of the laser-induced plasma were determined from spectroscopic measurements. The electron number density and temperature of fs-induced plasmas decreased faster than ns-induced plasmas due to different energy deposition mechanisms. Images of the laser-induced plasma were obtained with femtosecond time-resolved laser shadowgraph imaging. Plasma expansion in both the perpendicular and the lateral directions were compared. 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. EM rerusso@lbl.gov NR 23 TC 127 Z9 130 U1 5 U2 51 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD FEB PY 2005 VL 80 IS 2 BP 237 EP 241 DI 10.1007/s00339-004-2963-9 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 881JU UT WOS:000225864600006 ER PT J AU Sandrock, G Reilly, J Graetz, J Zhou, WM Johnson, J Wegrzyn, J AF Sandrock, G Reilly, J Graetz, J Zhou, WM Johnson, J Wegrzyn, J TI Accelerated thermal decomposition of AlH3 for hydrogen-fueled vehicles SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID ALPHA-ALUMINUM HYDRIDE; PHYSICOCHEMICAL PROPERTIES; STORAGE AB The potential for using aluminum hydride, AlH3, for vehicular hydrogen storage is explored. It is shown that particle-size control and doping of AlH3 with small levels of alkali-metal hydrides ( e. g. LiH) results in accelerated desorption rates. For AlH3 - 20 mol% LiH, 100degreesC desorption kinetics are nearly high enough to supply vehicles. It is highly likely that 2010 gravimetric and volumetric vehicular system targets ( 6 wt% H-2 and 0.045 kg/L) can be met with onboard AlH3. However, a new, low-cost method of off-board regeneration of spent Al back to AlH3 is needed. C1 Sunatech Inc, DOE Sandia Natl Labs, Ringwood, NJ 07456 USA. Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. RP Sandrock, G (reprint author), Sunatech Inc, DOE Sandia Natl Labs, 113 Kraft Pl, Ringwood, NJ 07456 USA. EM sandrock@warwick.net NR 21 TC 101 Z9 103 U1 3 U2 22 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD FEB PY 2005 VL 80 IS 4 BP 687 EP 690 DI 10.1007/s00339-004-3105-0 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 889RU UT WOS:000226460900004 ER PT J AU Eisebitt, S Lorgen, M Eberhardt, W Luning, J Stohr, J AF Eisebitt, S Lorgen, M Eberhardt, W Luning, J Stohr, J TI Lensless X-ray imaging of magnetic materials: basic considerations SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID PHASE-RETRIEVAL ALGORITHMS; HOLOGRAPHY; WAVELENGTHS; SCATTERING; RESOLUTION; PHYSICS AB General aspects related to lensless imaging of magnetic materials using X-rays are discussed. For holographic and iterative approaches, the requirements regarding coherence and oversampling are compared. The polarization dependence in resonant magnetic scattering is discussed with respect to the possibility of interference in holograms and speckle patterns. C1 BESSY, D-12489 Berlin, Germany. SLAC, SSRL, Menlo Pk, CA 94025 USA. RP Eisebitt, S (reprint author), BESSY, Albert Einstein Str 15, D-12489 Berlin, Germany. EM eisebitt@bessy.de NR 33 TC 12 Z9 12 U1 0 U2 15 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD FEB PY 2005 VL 80 IS 5 BP 921 EP 927 DI 10.1007/s00339-004-3117-9 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 935BH UT WOS:000229753300003 ER PT J AU Schafer, J Schrupp, D Rotenberg, E Kevan, SD Claessen, R AF Schafer, J Schrupp, D Rotenberg, E Kevan, SD Claessen, R TI Electronic interactions and phase transitions at surfaces and in low dimensions SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; SPIN-WAVE EXCITATION; CHARGE-DENSITY-WAVE; RESOLVED PHOTOEMISSION; MAGNETIC EXCITATIONS; ENERGY; IRON; SCATTERING; FE(110); STATE AB Low-dimensional and magnetic systems provide particularly clear-cut cases for the study of modified electron states that result from coupling with elementary excitations. Electronic quasiparticles of enhanced mass have been observed on the energy scale of phonons, and very recently on that of spin waves. Such mechanisms have bearing for superconducting pair formation, as spin fluctuations are being considered for high-temperature superconductivity. Phase transitions can occur if these interactions are accompanied by a nesting condition in the Fermi surface, leading to charge-or spin-density waves. The phase transition usually involves a structural distortion and is characterized by the opening of an energy gap. Special cases are the presence of multiple bands at the Fermi surface or the occurrence of thermal fluctuations. Recent progress in photoelectron spectroscopy and synchrotron-radiation instrumentation allow us to study these effects directly and resolved in k-space. Observations on surfaces, in magnetic materials, and in quasi-one-dimensional crystals are presented. C1 Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Univ Oregon, Dept Phys, Eugene, OR 97403 USA. RP Schafer, J (reprint author), Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany. EM joerg.schaefer@physik.uni-augsburg.de RI Kevan, Stephen/F-6415-2010; Rotenberg, Eli/B-3700-2009; Claessen, Ralph/A-2045-2017 OI Kevan, Stephen/0000-0002-4621-9142; Rotenberg, Eli/0000-0002-3979-8844; Claessen, Ralph/0000-0003-3682-6325 NR 35 TC 2 Z9 2 U1 0 U2 6 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0947-8396 EI 1432-0630 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD FEB PY 2005 VL 80 IS 5 BP 965 EP 970 DI 10.1007/s00339-004-3123-y PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 935BH UT WOS:000229753300009 ER PT J AU Isailovic, D Li, HW Phillips, GJ Yeung, ES AF Isailovic, D Li, HW Phillips, GJ Yeung, ES TI High-throughput single-cell fluorescence spectroscopy SO APPLIED SPECTROSCOPY LA English DT Article ID FLOW-CYTOMETRY; CAPILLARY-ELECTROPHORESIS; SPECTRA; MICROSCOPY; SUBUNIT AB A high-throughput method for measuring single-cell fluorescence spectra is presented. Upon excitation with a 488 run argon-ion laser many bacterial cells were imaged by a 20x microscope objective while they moved through a capillary tube. Fluorescence was dispersed by a transmission diffraction grating, and an intensified charge-coupled device (ICCD) camera simultaneously recorded the zero and the first orders of the fluorescence from each cell. Single-cell fluorescence spectra were reconstructed from the distance between zero-order and first-order maxima as well as the length and the pixel intensity distribution of the first-order images. By using this approach, the emission spectrum of E. coli cells expressing green fluorescent protein (GFP) was reconstructed. Also, fluorescence spectra of E. coli cells expressing non-fluorescent apo-subunits of R-phycoerythrin (R-PE) were recorded after incubation of the cells with phycoerythrobilin (PEB) chromophore. The fluorescence spectra are in good agreement with results obtained on the same cells using a fluorescence spectrometer or a fluorescence microscope. When spectra are to be acquired, this approach has a higher throughput, better sensitivity, and better spectral resolution compared to flow cytometry. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Vet Microbiol & Prevent Med, Ames, IA 50011 USA. RP Yeung, ES (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. OI Li, Hung Wing/0000-0003-4840-1965 NR 23 TC 17 Z9 17 U1 1 U2 18 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD FEB PY 2005 VL 59 IS 2 BP 221 EP 226 DI 10.1366/0003702053085124 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 897GF UT WOS:000226991300011 PM 15720763 ER PT J AU Choi, JH Damm, CJ O'Donovan, NJ Sawyer, RF Koshland, CP Lucas, D AF Choi, JH Damm, CJ O'Donovan, NJ Sawyer, RF Koshland, CP Lucas, D TI Detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy SO APPLIED SPECTROSCOPY LA English DT Article DE photofragmentation; fluorescence; photochemistry; plasma; lead ID INDUCED BREAKDOWN SPECTROSCOPY; PLASMA SPECTROSCOPY; HEAVY-METALS; HYDROCARBONS; EMISSIONS; CHILDREN C1 Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Engn Mech, Berkeley, CA 94720 USA. Sierra Nevada Coll, Sci & Technol Dept, Sparks, NV 89451 USA. Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA. RP Lucas, D (reprint author), Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. EM d_lucas@lbl.gov RI Sawyer, Robert/B-5013-2014 FU NIEHS NIH HHS [P42ESO47050-01] NR 19 TC 8 Z9 8 U1 1 U2 8 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD FEB PY 2005 VL 59 IS 2 BP 258 EP 261 DI 10.1366/0003702053085052 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 897GF UT WOS:000226991300016 PM 15720768 ER PT J AU Hall, LC Rogers, JM Denison, MS Johnson, ML AF Hall, LC Rogers, JM Denison, MS Johnson, ML TI Identification of the herbicide Surflan and its active ingredient oryzalin, a dinitrosulfonamide, as xenoestrogens SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID VITELLOGENIN MESSENGER-RNA; TROUT ONCORHYNCHUS-MYKISS; FEMALE-SPECIFIC SUBSTANCE; EGG ENVELOPE CHORION; FISH ORYZIAS-LATIPES; LOW-MOLECULAR-WEIGHT; RAINBOW-TROUT; ESTROGEN-RECEPTOR; IN-VIVO; ENVIRONMENTAL ESTROGENS AB Numerous environmental contaminants have been identified as endocrine disruptors (EDs) - substances that alter endocrine homeostasis by interfering with the biological action, production, or pharmacokinetics of endogenous hormones. Xenoestrogens are those EDs whose biological activity is similar to endogenous estrogen. This report presents data that identified Surflan, a proprietary herbicide emulsion, and its active ingredient oryzalin as xenoestrogens. In vitro, Surflan and oryzalin activated an estrogen-inducible reporter gene, and oryzalin competitively displaced 17 beta-estradiol from the estrogen receptor. In vivo, Surflan and oryzalin induced expression of estrogen-regulated high-molecular-weight choriogenin genes in medaka (Oryzias latipes). These results are consistent with the characteristics of previously identified xenoestrogens and indicate that Surflan and oryzalin have the potential to adversely affect numerous estrogen-regulated biological processes. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Oregon State Univ, Corvallis, OR 97331 USA. Univ Calif Davis, Davis, CA 95616 USA. RP Hall, LC (reprint author), Lawrence Livermore Natl Lab, L-396,POB 808, Livermore, CA 94550 USA. EM hall13@llnl.gov NR 50 TC 4 Z9 4 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD FEB PY 2005 VL 48 IS 2 BP 201 EP 208 DI 10.1007/s00244-003-0164-8 PG 8 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 905YX UT WOS:000227608800007 PM 15696347 ER PT J AU Tabibiazar, R Wagner, RA Spin, JM Ashley, EA Narasimhan, B Rubin, EM Efron, B Tsao, PS Tibshirani, R Quertermous, T AF Tabibiazar, R Wagner, RA Spin, JM Ashley, EA Narasimhan, B Rubin, EM Efron, B Tsao, PS Tibshirani, R Quertermous, T TI Mouse strain-specific differences in vascular wall gene expression and their relationship to vascular disease SO ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY LA English DT Article DE atherosclerosis; vascular disease; gene expression; microarray; inflammation; oxidative stress ID DEFICIENT MICE; ATHEROSCLEROSIS; SUSCEPTIBILITY; IDENTIFICATION; CHOLESTEROL; INVOLVEMENT; ADHESION; MODELS; CELLS AB Objective - Different strains of inbred mice exhibit different susceptibility to the development of atherosclerosis. The C3H/ HeJ and C57Bl/ 6 mice have been used in several studies aimed at understanding the genetic basis of atherosclerosis. Under controlled environmental conditions, variations in susceptibility to atherosclerosis reflect differences in genetic makeup, and these differences must be reflected in gene expression patterns that are temporally related to the development of disease. In this study, we sought to identify the genetic pathways that are differentially activated in the aortas of these mice. Methods and Results - We performed genome- wide transcriptional profiling of aortas from C3H/ HeJ and C57Bl/ 6 mice. Differences in gene expression were identified at baseline as well as during normal aging and longitudinal exposure to high- fat diet. The significance of these genes to the development of atherosclerosis was evaluated by observing their temporal pattern of expression in the well- studied apolipoprotein E model of atherosclerosis. Conclusion - Gene expression differences between the 2 strains suggest that aortas of C57Bl/ 6 mice have a higher genetic propensity to develop inflammation in response to appropriate atherogenic stimuli. This study expands the repertoire of factors in known disease- related signaling pathways and identifies novel candidate genes for future study. C1 Stanford Univ, Sch Med, Div Cardiovasc Med, Donald W Reynolds Cardiovasc Clin Res Ctr, Stanford, CA 94305 USA. Stanford Univ, Sch Med, Dept Hlth Res & Policy, Stanford, CA 94305 USA. Stanford Univ, Sch Med, Dept Stat, Stanford, CA 94305 USA. Lawrence Berkeley Natl Lab, Genome Sci Dept, Berkeley, CA USA. RP Tabibiazar, R (reprint author), Stanford Univ, Sch Med, Div Cardiovasc Med, Donald W Reynolds Cardiovasc Clin Res Ctr, 300 Pasteur Dr,Falk CVRC, Stanford, CA 94305 USA. EM rtabibiazar@cvmed.stanford.edu; tomq1@stanford.edu NR 25 TC 29 Z9 30 U1 0 U2 4 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1079-5642 J9 ARTERIOSCL THROM VAS JI Arterioscler. Thromb. Vasc. Biol. PD FEB PY 2005 VL 25 IS 2 BP 302 EP 308 DI 10.1161/011.ATV.0000151372.86863.a5 PG 7 WC Hematology; Peripheral Vascular Disease SC Hematology; Cardiovascular System & Cardiology GA 891PW UT WOS:000226594000009 PM 15550693 ER PT J AU Walker, L Sherman, M AF Walker, L Sherman, M TI Duct tape and sealant performance SO ASHRAE JOURNAL LA English DT Article C1 Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA USA. RP Walker, L (reprint author), Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA USA. NR 8 TC 0 Z9 0 U1 1 U2 2 PU AMER SOC HEATING REFRIGERATING AIR-CONDITIONING ENG, INC, PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 USA SN 0001-2491 J9 ASHRAE J JI ASHRAE J. PD FEB PY 2005 VL 47 IS 2 BP 34 EP + PG 6 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA 894VH UT WOS:000226819200009 ER PT J AU Quartararo, L Roth, KW Westphalen, D Brodrick, J AF Quartararo, L Roth, KW Westphalen, D Brodrick, J TI Wireless systems for building controls SO ASHRAE JOURNAL LA English DT Editorial Material C1 TIAX, Elect Syst Unit, Cambridge, MA USA. TIAX, Refrigerat Technol Sector, Cambridge, MA USA. HVAC, Cambridge, MA USA. US DOE, Bldg Technol Program, Washington, DC USA. RP Quartararo, L (reprint author), TIAX, Elect Syst Unit, Cambridge, MA USA. NR 11 TC 1 Z9 1 U1 0 U2 1 PU AMER SOC HEATING REFRIGERATING AIR-CONDITIONING ENG, INC, PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 USA SN 0001-2491 J9 ASHRAE J JI ASHRAE J. PD FEB PY 2005 VL 47 IS 2 BP 66 EP 67 PG 2 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA 894VH UT WOS:000226819200013 ER PT J AU De Vries, WH Becker, RH White, RL Loomis, C AF De Vries, WH Becker, RH White, RL Loomis, C TI Structure function analysis of long-term quasar variability SO ASTRONOMICAL JOURNAL LA English DT Article DE galaxies : active; galaxies : statistics; quasars : general ID ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; BL-LACERTAE OBJECTS; SPECTRAL SLOPE VARIABILITY; JHK' IMAGING PHOTOMETRY; OPTICAL VARIABILITY; QSO VARIABILITY; LUMINOSITY FUNCTION; DISK INSTABILITIES; STARBURST MODEL AB In our second paper on long-term quasar variability, we employ a much larger database of quasars than in de Vries, Becker & White. This expanded sample, containing 35,165 quasars from the Sloan Digital Sky Survey (SDSS) Data Release 2 and 6413 additional quasars in the same area of the sky taken from the Two Degree Field (2dF) QSO Redshift Survey, allows us to significantly improve on our earlier conclusions. As before, all the historic quasar photometry has been calibrated onto the SDSS scale by using large numbers of calibration stars around each quasar position. We find the following: (1) The outbursts have an asymmetric light-curve profile, with a fast-rise, slow-decline shape; this argues against a scenario in which microlensing events along the line of sight to the quasars are dominating the long-term variations in quasars. (2) There is no turnover in the structure function of the quasars up to timescales of similar to40 yr, and the increase in variability with increasing time lags is monotonic and constant. (3) Consequently, there is not a single preferred characteristic outburst timescale for the quasars, but most likely a continuum of outburst timescales. (4) The magnitude of the quasar variability is a function of wavelength: variability increases toward the blue part of the spectrum. (5) High-luminosity quasars vary less than low-luminosity quasars, consistent with a scenario in which variations have limited absolute magnitude. On this basis, we conclude that quasar variability is intrinsic to the active galactic nucleus and is caused by chromatic outbursts or flares that have limited luminosity range, varying timescales, and an overall asymmetric light-curve shape. Currently, the model that has the most promise of fitting the observations is based on accretion disk instabilities. C1 Univ Calif Davis, Davis, CA 95616 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Space Telescope Sci Inst, Baltimore, MD 21218 USA. RP De Vries, WH (reprint author), Univ Calif Davis, 1 Shields Ave, Davis, CA 95616 USA. EM devriesl@llnl.gov RI White, Richard/A-8143-2012 NR 48 TC 85 Z9 85 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 2005 VL 129 IS 2 BP 615 EP 629 DI 10.1086/427393 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 895HY UT WOS:000226852900005 ER PT J AU Fraser, OJ Hawley, SL Cook, KH Keller, SC AF Fraser, OJ Hawley, SL Cook, KH Keller, SC TI Long-period variables in the large magellanic cloud: Results from MACHO and 2MASS SO ASTRONOMICAL JOURNAL LA English DT Article DE galaxies : individual (Large Magellanic Cloud); stars : AGB and post-AGB; stars : variables : other ID GRAVITATIONAL LENSING EXPERIMENT; SECONDARY PERIODS; MIRA VARIABLES; GIANT BRANCH; RED GIANTS; STARS; OGLE; LMC; CALIBRATION; PULSATION AB We use the 8 year light-curve database from the MAssive Compact Halo Objects project together with infrared colors and magnitudes from the Two Micron All Sky Survey to identify a sample of 22,000 long-period variables in the Large Magellanic Cloud (referred to hereafter as LMC LPVs). A period-luminosity diagram of these stars reveals six well-defined sequences, in substantial agreement with previous analyses of samples from the Optical Gravitational Lensing Experiment. In our analysis we identify analogues to Galactic LPVs in the LMC LPV sample. We find that carbon-dominated asymptotic giant branch (AGB) stars populate only two of the sequences, one of which includes the Mira variables. The high-luminosity end of the same two sequences are also the location of the only stars with J - K-s > 2, indicating that they are enshrouded in dust. The unknown mechanism that drives the variability of stars in the longest period produces different morphology in the period-luminosity diagram as compared with the shortest period sequences, which are thought to be caused by pulsation. In particular, the longest period sequence extends to lower luminosity red giant branch stars, and the luminosity function does not peak among the AGB stars. We point out several features that will constrain new models of the period-luminosity sequences. C1 Univ Washington, Dept Astron, Seattle, WA 98195 USA. Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia. RP Fraser, OJ (reprint author), Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA. EM fraser@astro.washington.edu; slh@astro.washington.edu; kcook@llnl.gov; stefan@mso.anu.edu.au NR 28 TC 44 Z9 44 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 2005 VL 129 IS 2 BP 768 EP 775 DI 10.1086/426749 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 895HY UT WOS:000226852900015 ER PT J AU Jester, S Roser, HJ Meisenheimer, K Perley, R AF Jester, S Roser, HJ Meisenheimer, K Perley, R TI The radio-ultraviolet spectral energy distribution of the jet in 3C 273 SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE galaxies : jets; galaxies : quasars : individual : 3C 273; radiation mechanisms : non-thermal; acceleration of particles ID X-RAY-EMISSION; HUBBLE-SPACE-TELESCOPE; PARTICLE-ACCELERATION; HOT-SPOTS; M87 JET; SYNCHROTRON-RADIATION; COSMIC-RAYS; PICTOR-A; 3C 273; CHANDRA OBSERVATIONS AB We present deep VLA and HST observations of the large-scale jet in 3C 273 matched to 0."3 resolution. The observed spectra show a significant flattening in the infrared - ultraviolet wavelength range. The jet's emission cannot therefore be assumed to arise from a single electron population and requires the presence of an additional emission component. The observed smooth variations of the spectral indices along the jet imply that the physical conditions vary correspondingly smoothly. We determine the maximum particle energy for the optical jet using synchrotron spectral fits. The slow decline of the maximum energy along the jet implies particle reacceleration acting along the entire jet. In addition to the already established global anti-correlation between maximum particle energy and surface brightness, we find a weak positive correlation between small-scale variations in maximum particle energy and surface brightness. The origin of these conflicting global and local correlations is unclear, but they provide tight constraints for reacceleration models. C1 Max Planck Inst Astron, D-69117 Heidelberg, Germany. Natl Radio Astron Observ, Socorro, NM 87801 USA. RP Jester, S (reprint author), Fermilab Natl Accelerator Lab, MS 127,POB 500, Batavia, IL 60510 USA. EM jester@fnal.gov NR 63 TC 46 Z9 46 U1 0 U2 0 PU E D P SCIENCES PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD FEB PY 2005 VL 431 IS 2 BP 477 EP 502 DI 10.1051/0004-6361:20047021 PG 26 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 894ML UT WOS:000226795800011 ER PT J AU Combi, JA Benaglia, P Romero, GE Sugizaki, M AF Combi, JA Benaglia, P Romero, GE Sugizaki, M TI G337.2+0.1: A new X-ray supernova remnant? SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE X-ray : individuals : AX j1635.9-4719; radio continuum : ISM; ISM : supernova remnants; ISM : cosmic rays; X-rays : ISM; radiative mechanism : non-thermal ID EMISSION; SN-1006; ACCELERATION; VARIABILITY; ELECTRONS; CATALOG AB We present evidence supporting a SNR origin for the radio source G337.2+0.1, which was discovered along the line of sight to the Norma spiral arm in the MOST 843-MHz radio survey. The radio source is spatially superposed to the unidentified ASCA source AX J1635.9-4719. An analysis of this latter source reveals that its X-ray spectrum, extended nature, and non-variable flux are consistent with what is expected for a SNR. In addition, we have used HI-line observations of the region to look for any effect of the presumed remnant on the ISM. We have found a well-defined minimum centered at the position of the radio source in the velocity range of similar to-25 to - 19 km s(-1). This feature appears as a sharp absorption dip in the spectrum that might be produced when the continuum emission from the SNR candidate is absorbed by foreground gas. Hence we have used it to constrain the distance to the source, which seems to be a young ( age similar to a few 10(3) yr) and distant ( d similar to14 kpc) SNR. G337.2+ 0.1 and AX J1635.9- 4719 would be the radio/X-ray manifestations of this remnant. C1 Univ Jaen, Dept Fis EPS, Jaen 23071, Spain. Inst Argentino Radioastron CC5, Buenos Aires, DF, Argentina. UNLP, Fac Ciencias Astron & Geofis, La Plata, Argentina. Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Combi, JA (reprint author), Univ Jaen, Dept Fis EPS, Campus Lagunillas S-N, Jaen 23071, Spain. EM jcombi@ujaen.es NR 26 TC 8 Z9 8 U1 0 U2 0 PU E D P SCIENCES PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD FEB PY 2005 VL 431 IS 2 BP L9 EP L12 DI 10.1051/0004-6361:200400136 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 894ML UT WOS:000226795800003 ER PT J AU Lidman, C Howell, DA Folatelli, G Garavini, G Nobili, S Aldering, G Amanullah, R Antilogus, P Astier, P Blanc, G Burns, MS Conley, A Deustua, SE Doi, M Ellis, R Fabbro, S Fadeyev, V Gibbons, R Goldhaber, G Goobar, A Groom, DE Hook, I Kashikawa, N Kim, AG Knop, RA Lee, BC Mendez, J Morokuma, T Motohara, K Nugent, PE Pain, R Perlmutter, S Prasad, V Quimby, R Raux, J Regnault, N Ruiz-Lapuente, P Sainton, G Schaefer, BE Schahmaneche, K Smith, E Spadafora, AL Stanishev, V Walton, NA Wang, L Wood-Vasey, WM Yasuda, N AF Lidman, C Howell, DA Folatelli, G Garavini, G Nobili, S Aldering, G Amanullah, R Antilogus, P Astier, P Blanc, G Burns, MS Conley, A Deustua, SE Doi, M Ellis, R Fabbro, S Fadeyev, V Gibbons, R Goldhaber, G Goobar, A Groom, DE Hook, I Kashikawa, N Kim, AG Knop, RA Lee, BC Mendez, J Morokuma, T Motohara, K Nugent, PE Pain, R Perlmutter, S Prasad, V Quimby, R Raux, J Regnault, N Ruiz-Lapuente, P Sainton, G Schaefer, BE Schahmaneche, K Smith, E Spadafora, AL Stanishev, V Walton, NA Wang, L Wood-Vasey, WM Yasuda, N CA Supernova Cosmology Project TI Spectroscopic confirmation of high-redshift supernovae with the ESO VLT SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE stars : supernovae : general; cosmology : observations ID PROBE WMAP OBSERVATIONS; HUBBLE-SPACE-TELESCOPE; COSMOLOGICAL PARAMETERS; IA SUPERNOVAE; UNIVERSE; LAMBDA; OMEGA; DECELERATION; CONSTRAINTS; DISCOVERY AB We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using type Ia supernovae (SNe Ia) over a wide range of redshifts. From the spectra alone, 20 candidates are spectrally classified as SNe Ia with redshifts ranging from z=0.212 to z=1.181. Of the remaining 19 candidates, 1 might be a type II supernova and 11 exhibit broad supernova-like spectral features and/or have supernova-like light curves. The candidates were discovered in 8 separate ground-based searches. In those searches in which SNe Ia at zsimilar to0.5 were targeted, over 80% of the observed candidates were spectrally classified as SNe Ia. In those searches in which SNe Ia with z>1 were targeted, 4 candidates with z>1 were spectrally classified as SNe Ia and later followed with ground and space based observatories. We present the spectra of all candidates, including those that could not be spectrally classified as supernova. C1 European So Observ, Santiago 19, Chile. EO Lawrence Berkeley Natl Lab, Berkeley, CA USA. Univ Toronto, Dept Astron & Astrophys, Toronto, ON, Canada. Stockholm Univ, S-10691 Stockholm, Sweden. Univ Paris 06, CNRS, LPNHE, IN2P3, Paris, France. Univ Paris 07, CNRS, LPNHE, IN2P3, Paris, France. Osserv Astron Padova, I-35122 Padua, Italy. Colorado Coll, Colorado Springs, CO 80903 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Amer Astronom Soc, Washington, DC USA. Univ Tokyo, Astron Inst, Sch Sci, Tokyo, Japan. CALTECH, Pasadena, CA 91125 USA. IST, CENTRA, Ctr M Astrofis, Lisbon, Portugal. IST, Dept Phys, Lisbon, Portugal. Univ Oxford, Dept Phys, Nucl & Astrophys Lab, Oxford OX1 2JD, England. Natl Astron Observ, Tokyo 1810058, Japan. Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Isaac Newton Grp, La Palma, Spain. Univ Barcelona, Dept Astron, E-08007 Barcelona, Spain. Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England. Univ Tokyo, Inst Cosm Ray Res, Tokyo, Japan. RP European So Observ, Casilla 19001, Santiago 19, Chile. EM clidman@eso.org RI Folatelli, Gaston/A-4484-2011; Yasuda, Naoki/A-4355-2011; Stanishev, Vallery/M-8930-2013; MOTOHARA, KENTARO/G-4905-2014; Perlmutter, Saul/I-3505-2015 OI Stanishev, Vallery/0000-0002-7626-1181; MOTOHARA, KENTARO/0000-0002-0724-9146; Perlmutter, Saul/0000-0002-4436-4661 NR 26 TC 31 Z9 32 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 1432-0746 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD FEB PY 2005 VL 430 IS 3 BP 843 EP 851 DI 10.1051/0004-6361:20041504 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 892DU UT WOS:000226630800013 ER PT J AU Lavraud, B Cargill, PJ AF Lavraud, B Cargill, PJ TI Cluster reveals the magnetospheric cusps SO ASTRONOMY & GEOPHYSICS LA English DT Article ID HIGH-ALTITUDE CUSP; BOUNDARY-LAYER; RECONNECTION; PLASMA; MAGNETOPAUSE AB We report on the structure of the high-altitude cusp regions of the terrestrial magnetosphere, which has been the topic of numerous studies using the multispacecraft data from the ESA's Cluster mission. This summary of the 8 October 2004 RAS meeting focuses on the characteristics of the large-scale structure of these regions. We explore the role played by the cusps for solar wind plasma penetration and transport into the magnetosphere by examining the effects of the orientation of the interplanetary magnetic field (IMF) and of the occurrence of the magnetic reconnection process. We additionally emphasize, through the description of two selected techniques, the ability of the Cluster four-spacecraft measurements to resolve boundary dynamics and wave characteristics in an unprecedented fashion. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ London Imperial Coll Sci Technol & Med, London, England. RP Lavraud, B (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 23 TC 1 Z9 1 U1 1 U2 2 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 1366-8781 J9 ASTRON GEOPHYS JI Astron. Geophys. PD FEB PY 2005 VL 46 IS 1 BP 32 EP 35 PG 4 WC Astronomy & Astrophysics; Geochemistry & Geophysics SC Astronomy & Astrophysics; Geochemistry & Geophysics GA 890SD UT WOS:000226530200028 ER PT J AU Shaw, WJ Doran, JC Coulter, RL AF Shaw, WJ Doran, JC Coulter, RL TI Boundary-layer evolution over Phoenix, Arizona and the premature mixing of pollutants in the early morning SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE boundary layer; complex terrain; density current; ozone; air pollution ID OZONE; TRANSITION; CHEMISTRY; VALLEY; FLOW AB The 2001 Phoenix Sunrise campaign was a field measurement program to investigate the early morning chemical and meteorological processes associated with the development of ozone pollution in Phoenix, Arizona. As part of that study, atmospheric structure was measured using wind profiling radars, sodars, and radiosondes at several locations in the Phoenix metropolitan area. Chemical measurements made by other investigators showed that vertical mixing of pollutants began prior to sunrise on a number of occasions. This was surprising, since we expected sustained mixing to occur only after sunrise and the onset of solar heating. We have used the meteorological measurements to identify a density current that commonly arrives in downtown Phoenix in the hour or two before sunrise when conditions are undisturbed. Both winds and cold advection associated with this feature act to destabilize the lower atmosphere, and the resulting mixing continues through the morning transition to convective conditions. Because photochemical production of ozone is non-linearly dependent on the concentrations of precursor species, this early mixing will need to be properly represented in combined meteorological and chemical models if they are to be fully successful in simulating ozone concentrations. (C) 2004 Elsevier Ltd. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Shaw, WJ (reprint author), Pacific NW Natl Lab, POB 999,MS K9-30, Richland, WA 99352 USA. EM will.shaw@pnl.gov NR 14 TC 8 Z9 8 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD FEB PY 2005 VL 39 IS 4 BP 773 EP 786 DI 10.1016/j.atmosenv.2004.08.055 PG 14 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 893HS UT WOS:000226710500016 ER PT J AU Ghirardi, ML King, PW Posewitz, MC Maness, PC Fedorov, A Kim, K Cohen, J Schulten, K Seibert, M AF Ghirardi, ML King, PW Posewitz, MC Maness, PC Fedorov, A Kim, K Cohen, J Schulten, K Seibert, M TI Approaches to developing biological H-2-photoproducing organisms and processes SO BIOCHEMICAL SOCIETY TRANSACTIONS LA English DT Article; Proceedings Paper CT International Hydrogenases Conference CY AUG 24-29, 2004 CL Univ Reading, Reading, ENGLAND SP COST, European Sci Fdn, European Off Aerosp Res & Dev HO Univ Reading DE biohydrogen; cyanobacteria; green algae; hydrogenase; O-2 inactivation; sulphur deprivation ID ALGA CHLAMYDOMONAS-REINHARDTII; OXYGEN TOLERANCE; HYDROGEN; PROSPECTS AB The development of efficient biological systems for the direct photoproduction of H-2 gas from water faces several challenges, the more serious of which is the sensitivity of the H-2-evolving enzymes (hydrogenases) to 02, an obligatory by-product of photosynthesis. This high sensitivity is common to both FeFe and NiFe hydrogenases, and is caused by O-2 binding to their respective metallocatalytic sites. This overview describes approaches to (i) molecular engineering of algal FeFe-hydrogenase to prevent 02 access to its catalytic site; (ii) transform a cyanobacterium with an O-2-tolerant bacterial NiFe hydrogenase or (c) partially inactivate algal O-2-evolution activity to create physiologically anaerobiosis and induce hydrogenase expression. C1 Natl Renewable Energy Lab, Golden, CO USA. Colorado Sch Mines, Golden, CO 80401 USA. Univ Illinois, Beckman Inst, Urbana, IL 61801 USA. RP Ghirardi, ML (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM maria_ghirardi@nrel.gov RI Schulten, Klaus/D-5561-2009; King, Paul/D-9979-2011 OI King, Paul/0000-0001-5039-654X NR 17 TC 58 Z9 66 U1 0 U2 13 PU PORTLAND PRESS LTD PI LONDON PA 59 PORTLAND PLACE, LONDON W1B 1QW, ENGLAND SN 0300-5127 J9 BIOCHEM SOC T JI Biochem. Soc. Trans. PD FEB PY 2005 VL 33 BP 70 EP 72 PN 1 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 901GA UT WOS:000227269800021 PM 15667268 ER PT J AU Cohen, J Kim, K Posewitz, M Ghirardi, ML Schulten, K Seibert, M King, P AF Cohen, J Kim, K Posewitz, M Ghirardi, ML Schulten, K Seibert, M King, P TI Molecular dynamics and experimental investigation of H-2 and O-2 diffusion in [Fe]-hydrogenase SO BIOCHEMICAL SOCIETY TRANSACTIONS LA English DT Article; Proceedings Paper CT International Hydrogenases Conference CY AUG 24-29, 2004 CL Univ Reading, Reading, ENGLAND SP COST, European Sci Fdn, European Off Aerosp Res & Dev HO Univ Reading DE Chlamydomonas reinhordtii; gas diffusion; hydrogenase; molecular dynamics; oxygen sensitivity; substrate ID CLOSTRIDIUM-PASTEURIANUM; CARBON-MONOXIDE; ACTIVE-SITE; HYDROGENASE; INACTIVATION; EVOLUTION; PROTEINS; OXYGEN AB The [Fe]-hydrogenase enzymes are highly efficient H-2 catalysts found in ecologically and phylogenetically diverse microorganisms, including the photosynthetic green alga, Chlomydomonas reinhardtii. Although these enzymes can occur in several forms, H-2 catalysis takes place at a unique [FeS] prosthetic group or H-cluster, located at the active site. Significant to the function of hydrogenases is how the surrounding protein structure facilitates substrate-product transfer, and protects the active site H-cluster from inactivation. To elucidate the role of protein structure in O-2 inactivation of [Fe]-hydrogenases, experimental and theoretical investigations have been performed. Molecular dynamics was used to comparatively investigate O-2 and H-2 diffusion in Cpl ([Fe]-hydrogenase I from Clostridium pasteurianum). our preliminary results suggest that H-2 diffuses more easily and freely than O-2, which is restricted to a small number of allowed pathways to and from the active site. These O-2 pathways are located in the conserved active site domain, shown experimentally to have an essential role in active site protection. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Univ Illinois, Beckman Inst, Urbana, IL 61801 USA. Colorado Sch Mines, Dept Environm Sci & Engn, Golden, CO 80401 USA. RP King, P (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM paul_king@nrel.gov RI Schulten, Klaus/D-5561-2009; King, Paul/D-9979-2011 OI King, Paul/0000-0001-5039-654X FU NCRR NIH HHS [P41 RR005969-11, P41-RR05969, P41 RR005969] NR 17 TC 71 Z9 74 U1 0 U2 14 PU PORTLAND PRESS LTD PI LONDON PA 59 PORTLAND PLACE, LONDON W1B 1QW, ENGLAND SN 0300-5127 J9 BIOCHEM SOC T JI Biochem. Soc. Trans. PD FEB PY 2005 VL 33 BP 80 EP 82 PN 1 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 901GA UT WOS:000227269800024 PM 15667271 ER PT J AU Posewitz, MC King, PW Smolinski, SL Smith, RD Ginley, AR Ghirardi, ML Seibert, M AF Posewitz, MC King, PW Smolinski, SL Smith, RD Ginley, AR Ghirardi, ML Seibert, M TI Identification of genes required for hydrogenase activity in Chlamydomonas reinhardtii SO BIOCHEMICAL SOCIETY TRANSACTIONS LA English DT Article; Proceedings Paper CT International Hydrogenases Conference CY AUG 24-29, 2004 CL Univ Reading, Reading, ENGLAND SP COST, European Sci Fdn, European Off Aerosp Res & Dev HO Univ Reading DE Chlamydomonas reinhardtii; H-2 photoproduction; hydrogenase; insertional mutagenesis; metalloprotein assembly; starch ID FE-HYDROGENASE; CYANOBACTERIA; EVOLUTION; PROTEINS AB The eukaryotic green alga, Chlamydomonos reinhordtii, produces H-2 under anaerobic conditions, in a reaction catalysed by an [FeFe]-hydrogenase. To identify genes that influence H-2 production in C reinhordtii, a library of 6000 colonies on agar plates was screened with sensitive chemochromic H-2-sensor films for clones defective in H-2 production. Two mutants of particular interest were fully characterized. One mutant, hydEF-1, is unable to assemble an active [FeFe]-hydrogenase. This is the first reported C. reinhardtii mutant that is not capable of producing any H-2. The second mutant, sta7-10, is not able to accumulate insoluble starch and has significantly lowered H-2-photoproduction rates in comparison with the wild-type. in hydEF-1, anaerobiosis induces transcription of the two reported. C reinhardtii hydrogenase genes, HydA1 and HydA2, indicating a normal transcriptional response to anaerobiosis. in contrast, the transcription of both hydrogenase genes in sta7-10 is significantly attenuated. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Colorado Sch Mines, Dept Environm Sci & Engn, Golden, CO 80401 USA. RP Seibert, M (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. EM Mike_Seibert@nrel.gov RI King, Paul/D-9979-2011 OI King, Paul/0000-0001-5039-654X NR 17 TC 49 Z9 51 U1 2 U2 12 PU PORTLAND PRESS LTD PI LONDON PA 59 PORTLAND PLACE, LONDON W1B 1QW, ENGLAND SN 0300-5127 J9 BIOCHEM SOC T JI Biochem. Soc. Trans. PD FEB PY 2005 VL 33 BP 102 EP 104 PN 1 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 901GA UT WOS:000227269800030 PM 15667277 ER PT J AU Davydov, R Behrouzian, B Smoukov, S Stubbe, J Hoffman, BM Shanklin, J AF Davydov, R Behrouzian, B Smoukov, S Stubbe, J Hoffman, BM Shanklin, J TI Effect of substrate on the diiron(III) site in stearoyl acyl carrier protein Delta(9)-desaturase as disclosed by cryoreduction electron paramagnetic resonance/electron nuclear double resonance spectroscopy SO BIOCHEMISTRY LA English DT Article ID DINUCLEAR IRON SITE; VALENT MU-OXO; RIBONUCLEOTIDE REDUCTASE; METHANE MONOOXYGENASE; RADIOLYTIC REDUCTION; DELTA(9) DESATURASE; OXYGEN ACTIVATION; CRYSTAL-STRUCTURE; ACP DESATURASE; FE CENTER AB The diiron center in stearoyl-acyl carrier protein (ACP) desaturase (DS) from castor plant Ricinus communis catalyzes the dioxygen- and NADPH-dependent introduction of a cis double bond between C9 and C10 of stearoyl-ACP. Radiolytic reduction of diferric DS at 77 K produces an electron paramagnetic resonance (EPR)-detectable mixed-valence center (or [DSox](mv)) that is trapped in the conformation of the diferric precursor and thus provides a sensitive EPR/electron nuclear double resonance (ENDOR) probe of the structure of the diamagnetic diiron(III) state. The cryoreduced DS shows two distinct EPR signals, suggesting the presence of two diiron(III) states: the mu-oxo (major)- and mu-hydroxo (minor)-bridged diiron centers. ENDOR studies show that in the dominant oxo-bridged diferric state each iron(III) coordinates a histidine and a water along with other ligands. Samples containing stoichiometric amounts of stearoyl-ACP show pronounced changes in the EPR and H-1 ENDOR spectra of cryoreduced DS. EPR spectra of the cryoreduced DS-substrate complex reveal two distinct substates of the parent. EPR and ENDOR studies show that both major conformers of the diferric cluster have a mu-oxo bridge. ENDOR shows that the major conformer has a histidine and a water bound to both Fe ions. In the minor conformer, one of the irons has lost the terminal water ligand. The structure of the trapped [DSox](mv) state relaxes upon annealing to 170 K: the mu-oxo bridge in the major cryoreduced DS species protonates on annealing to 170 K; this does not occur for the major DS-substrate complex, even upon annealing to 230 K. The relaxed Fe(II)Fe(III) center in cryoreduced DS and DS-substrate show much less intense and resolved N-14 ENDOR spectra than those of the structurally similar cryoreduced diiron center in ribonucleotide reductase (RNR) protein R2. This difference may reflect some differences in His-Fe bonds. The alterations in the diferric site of DS induced by substrate are suggested to be mediated by conformational changes in the polypeptide chain produced by substrate binding. These structural alterations may provide DS with an additional mechanism for tuning the redox potential of the diferric site. The mixed-valence states of DS are unstable at temperatures above 230 K. C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Brookhaven Natl Lab, Dept BO, Upton, NY 11973 USA. MIT, Dept Chem, Cambridge, MA 02139 USA. RP Hoffman, BM (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA. EM bmh@northwestem.edu RI Smoukov, Stoyan/F-8545-2011 FU NHLBI NIH HHS [HL 13531]; NIGMS NIH HHS [GM 2959] NR 32 TC 15 Z9 17 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 1 PY 2005 VL 44 IS 4 BP 1309 EP 1315 DI 10.1021/bi048599t PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 891QE UT WOS:000226594800023 PM 15667224 ER PT J AU Espeland, EK Carlsen, TM Macqueen, D AF Espeland, EK Carlsen, TM Macqueen, D TI Fire and dynamics of granivory on a California grassland forb SO BIODIVERSITY AND CONSERVATION LA English DT Article DE Amsinckia grandiflora; fire; indirect effects; rare plants; reproductive ecology; seed predation ID POSTDISPERSAL SEED PREDATION; PEROMYSCUS-LEUCOPUS; ENDANGERED PLANT; POPULATION; RODENTS; ECOLOGY; SIZE; COMMUNITY; PATTERNS; ANNUALS AB This study examines the effects of burning and granivory on the reproductive success of the rare plant Amsinckia grandiflora ( Boraginaceae). Fire is often used in California grasslands as a means of exotic species control, but the indirect effects these controls have on the reproductive ecology of native plants are rarely assessed. The interaction of fire with granivory of A. grandiflora seeds was examined in California grasslands over five years ( 1998 - 2002). In 1998 and 1999, both burned and unburned plots had bird-exclusion ( netted) and no-exclusion ( open) treatments. Predation rates were high ( 51 - 99%) and final predation rates did not differ among treatments. In 2000, granivory rates in the unburned, open plots were lower than in previous years (14%), and rodent trapping yielded only a single animal. Low granivory rates were observed in 2001 for unburned, open plots (47%). In 2001, burned/open plots experienced significantly more granivory (87%) than either burned/netted plots (37%) or unburned/open plots ( 47%). In 2002, every seed was taken from burned, open plots. Granivory was highly variable, ranging from 4 to 100% per plot over a 3-week period. Nearly all plots were discovered (> 10% predation) by granivores in all trials in all years. When data from all treatments were combined, significant differences in granivory rates occurred among years, indicating stronger inter-year effects than within-year effects due to burning or bird exclusion. Fire affects granivory when overall predation rates are low, but when predation levels are high ( as they were in 1998 and 1999), fire may not affect granivory occurring within the same year. Models extending seed survivorship through the dry summer indicate that most seeds are eaten, even when granivory rates are low. C1 Lawrence Livermore Natl Lab, Environm Restorat Div, Livermore, CA 94551 USA. RP Espeland, EK (reprint author), Univ Calif Davis, Dept Agron & Range Sci, Grad Ecol Grp, Davis, CA 95616 USA. EM ekespeland@ucdavis.edu OI Espeland, Erin/0000-0001-8541-3610 NR 40 TC 7 Z9 7 U1 1 U2 9 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0960-3115 J9 BIODIVERS CONSERV JI Biodivers. Conserv. PD FEB PY 2005 VL 14 IS 2 BP 267 EP 280 DI 10.1007/s10531-004-5044-7 PG 14 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 899OI UT WOS:000227153600001 ER PT J AU Kuiken, C Yusim, K Boykin, L Richardson, R AF Kuiken, C Yusim, K Boykin, L Richardson, R TI The Los Alamos hepatitis C sequence database SO BIOINFORMATICS LA English DT Article ID VIRUS; MODEL; HIV AB Motivation: The hepatitis C virus (HCV) is a significant threat to public health worldwide. The virus is highly variable and evolves rapidly, making it an elusive target for the immune system and for vaccine and drug design. At present, some 30 000 HCV sequences have been published. A central website that provides annotated sequences and analysis tools will be helpful to HCV scientists worldwide. Results: The HCV sequence database collects and annotates sequence data and provides them to the public via a website that contains a user-friendly search interface and a large number of sequence analysis tools, based on the model of the highly regarded Los Alamos HIV database. The HCV sequence database was officially launched in September 2003. Since then, its usage has steadily increased and is now at an average of similar to280 visits per day from distinct IP addresses. C1 Los Alamos Natl Lab, HCV Database, Los Alamos, NM 87544 USA. RP Kuiken, C (reprint author), Los Alamos Natl Lab, HCV Database, Los Alamos, NM 87544 USA. EM hcv-info@lanl.gov RI Boykin, Laura/H-8876-2014 OI Boykin, Laura/0000-0002-6101-1921 FU PHS HHS [04-2085] NR 21 TC 230 Z9 241 U1 0 U2 5 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1367-4803 J9 BIOINFORMATICS JI Bioinformatics PD FEB 1 PY 2005 VL 21 IS 3 BP 379 EP 384 DI 10.1093/bioinformatics/bth485 PG 6 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 891UE UT WOS:000226605700013 PM 15377502 ER PT J AU LaVan, DA Padera, RF Friedmann, TA Sullivan, JP Langer, R Kohane, DS AF LaVan, DA Padera, RF Friedmann, TA Sullivan, JP Langer, R Kohane, DS TI In vivo evaluation of tetrahedral amorphous carbon SO BIOMATERIALS LA English DT Article DE biocompatibility; amorphous diamond; amorphous carbon; thin film; in vivo testing ID BIOMEDICAL APPLICATIONS; DIAMOND; FILMS; BIOCOMPATIBILITY; COATINGS; MACROPHAGES; ACTIVATION; ADHESION; VITRO AB The in vivo behavior and tissue reaction to tetrahedral amorphous carbon (ta-C) has been evaluated for periods of up to 6 months in SV129 mice. Two sample types were tested-silicon die coated with ta-C (n=53) and micromachined particles (n=40). The coated samples were compared to uncoated silicon die (n=22). Die samples were implanted subcutaneously, and tissue reaction and capsule formation were evaluated at various time points. Micromachined particles of 1, 3 10, and 30 mum were injected adjacent to the sciatic nerve, and tissue samples were examined histologically at various time points (4 days-6 months). Tissue reaction to ta-C was mild and was localized to the area of the injection or implantation. Samples with a higher ratio of 3-fold bonding appeared to shed material during the experiments; this was not observed on samples with a higher level of 4-fold bonding. nor on uncoated silicon die. The results strongly suggest that films with greater 4-fold bonding character (more diamondlike) are more resistant to in vivo fragmentation than films with higher 3-fold character (more graphitic) (C) 2004 Elsevier Ltd. All rights reserved. C1 Massachusetts Gen Hosp, Pediat Intens Care Unit, Dept Pediat, Boston, MA 02114 USA. Yale Univ, Dept Mech Engn, New Haven, CT 06520 USA. MIT, Harvard Mit Div Hlth Sci & Technol, Cambridge, MA 02139 USA. Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. MIT, Dept Chem Engn, Cambridge, MA 02139 USA. RP Kohane, DS (reprint author), Massachusetts Gen Hosp, Pediat Intens Care Unit, Dept Pediat, Ellison 317,55 Fruit St, Boston, MA 02114 USA. EM dkohane@partners.org RI LaVan, David/C-3943-2012 OI LaVan, David/0000-0002-1952-0028 FU NIGMS NIH HHS [GM00684] NR 29 TC 24 Z9 25 U1 0 U2 5 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0142-9612 J9 BIOMATERIALS JI Biomaterials PD FEB PY 2005 VL 26 IS 5 BP 465 EP 473 DI 10.1016/j.biomaterials.2004.02.071 PG 9 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA 857RJ UT WOS:000224135700001 PM 15276354 ER PT J AU Tok, JBH Bi, LR Saenz, M AF Tok, JBH Bi, LR Saenz, M TI Specific recognition of napthyridine-based ligands toward guanine-containing bulges in RNA duplexes and RNA-DNA heteroduplexes SO BIOORGANIC & MEDICINAL CHEMISTRY LETTERS LA English DT Article DE napthyridine; fluorescence; nucleic acids; circular dichroism; DNA melt ID REV RESPONSIVE ELEMENT; VIRUS TAT-PROTEIN; HIV-1 REV; NAPHTHYRIDINE DIMER; BINDING; RRE; PEPTIDE; INHIBITION; COMPLEX; SEQUENCE AB Mismatched bulges in nucleic acid constructs are important in the recognition event between biological molecules. Herein, it is observed that napthyridine dimer 2 is able to specifically bind G-G mismatches in all nucleic acid constructs comprising of RNA-RNA, RNA-DNA and DNA-DNA duplexes. However, the binding affinity of 2 is strongest toward DNA duplex, followed by RNA-DNA heteroduplex and RNA duplex being the weakest binding partner. Nonetheless, this binding behavior suggests that the binding process primarily occurs between the guanine base pairs and the napthyridine moiety, and is independent of the tertiary structure of the nucleic acid duplexes. Published by Elsevier Ltd. C1 CUNY York Coll, Dept Chem, Jamaica, NY 11451 USA. CUNY Grad Ctr, Jamaica, NY 11451 USA. RP Tok, JBH (reprint author), Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, 7000 E Ave,L-234, Livermore, CA 94551 USA. EM tok2@llnl.gov FU NIGMS NIH HHS [GM 08153-26] NR 35 TC 18 Z9 18 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0960-894X J9 BIOORG MED CHEM LETT JI Bioorg. Med. Chem. Lett. PD FEB 1 PY 2005 VL 15 IS 3 BP 827 EP 831 DI 10.1016/j.bmcl.2004.10.059 PG 5 WC Chemistry, Medicinal; Chemistry, Organic SC Pharmacology & Pharmacy; Chemistry GA 896LN UT WOS:000226935700067 PM 15664866 ER PT J AU Werner, JH Cai, H Keller, RA Goodwin, PM AF Werner, JH Cai, H Keller, RA Goodwin, PM TI Exonuclease I hydrolyzes DNA with a distribution of rates SO BIOPHYSICAL JOURNAL LA English DT Article ID ESCHERICHIA-COLI; OPTICAL TRAPS; BINDING; PROCESSIVITY; DEOXYRIBONUCLEASES; HETEROGENEITY; MOLECULES; DYNAMICS; KINETICS AB We report heterogeneity in the time necessary for Exonuclease I to hydrolyze identical DNA fragments. A real-time fluorescence method measured the time required by molecules of Exonuclease I to hydrolyze single-stranded DNA that was synthesized to have two fluorescently labeled nucleotides. One fluorescently labeled nucleotide was located near the 3' end of the DNA and the other near the 5' end. Heterogeneity in the hydrolysis rate of the exonuclease population was inferred from the distribution of times necessary to cleave these DNA fragments. In particular, we found simple first-order kinetics, using a single hydrolysis rate, did not result in a good fit to the data. Better fits to the data were obtained if one assumed a distribution of hydrolysis rates for the exonuclease population. Under our experimental conditions, this broad distribution of rates was centered near 100 nt/s. C1 Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. RP Werner, JH (reprint author), Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. EM jwerner@lanl.gov NR 28 TC 13 Z9 13 U1 0 U2 6 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 2005 VL 88 IS 2 BP 1403 EP 1412 DI 10.1529/biophysj.104.044255 PG 10 WC Biophysics SC Biophysics GA 893WI UT WOS:000226750800057 PM 15542563 ER PT J AU Shi, L Lin, JT Markillie, LM Squier, TC Hooker, BS AF Shi, L Lin, JT Markillie, LM Squier, TC Hooker, BS TI Overexpression of multi-heme C-type cytochromes SO BIOTECHNIQUES LA English DT Article ID SHEWANELLA-ONEIDENSIS MR-1; HIGH-LEVEL EXPRESSION C1 Pacific NW Natl Lab, Microbiol Grp, Richland, WA 99352 USA. RP Shi, L (reprint author), Pacific NW Natl Lab, Microbiol Grp, MSIN P7-50,902 Battelle Blvd,POB 999, Richland, WA 99352 USA. EM Liang.Shi@pnl.gov NR 12 TC 36 Z9 36 U1 1 U2 9 PU EATON PUBLISHING CO PI WESTBOROUGH PA ONE RESEARCH DRIVE, SUITE 400A, PO BOX 1070, WESTBOROUGH, MA 01581-6070 USA SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD FEB PY 2005 VL 38 IS 2 BP 297 EP 299 DI 10.2144/05382PT01 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 897IC UT WOS:000226996200018 PM 15727136 ER PT J AU Kinney, JH Stolken, JS Smith, TS Ryaby, JT Lane, NE AF Kinney, JH Stolken, JS Smith, TS Ryaby, JT Lane, NE TI An orientation distribution function for trabecular bone SO BONE LA English DT Article DE trabecular bone; human vertebra; orientation; microtomography; osteoporosis ID SKELETON GRAPH ANALYSIS; CANCELLOUS BONE; SYNCHROTRON-RADIATION; MECHANICAL-PROPERTIES; CELLULAR MATERIALS; ARCHITECTURE; MICROSCOPY; MODEL; OSTEOPOROSIS; TOMOGRAPHY AB We describe a new method for quantifying the orientation of trabecular bone from three-dimensional images. Trabecular lattices from five human vertebrae were decomposed into individual trabecular elements, and the orientation, mass, and thickness of each element were recorded. Continuous functions that described the total mass (M(phi,theta)) and mean thickness (tau((phi,theta)) of all trabeculae as a function of orientation were derived. The results were compared with experimental measurements of the elastic modulus in three principal anatomic directions. A power law scaling relationship between the anisotropies in mass and elastic modulus was observed; the scaling exponent was 1.41 (R-2 = 0.88). As expected, the preponderance of trabecular mass was oriented along the cranial-caudal direction; on average, there was 3.4 times more mass oriented vertically than horizontally. Moreover, the vertical trabeculae were 30% thicker, on average, than the horizontal trabeculae. The vertical trabecular thickness was inversely related to connectivity (R-2 = 0.70; P = 0.07), suggesting a possible organization into either few, thick trabeculae or many thin trabeculae. The method, which accounts for the mechanical connectedness of the lattice, provides a rapid way to both visualize and quantify the three-dimensional organization of trabecular bone. (c) 2004 Elsevier lnc. All rights reserved. C1 UCSF, Dept Mech Engn, UCB,Joint Grad Grp Bioengn, Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Ortholog Corp, Res & Dev, Tempe, AZ 85281 USA. Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA. RP Kinney, JH (reprint author), UCSF, Dept Mech Engn, UCB,Joint Grad Grp Bioengn, Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM kinney3@llnl.gov FU NIAMS NIH HHS [2R01-AR043052-07] NR 47 TC 19 Z9 19 U1 1 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 8756-3282 J9 BONE JI Bone PD FEB PY 2005 VL 36 IS 2 BP 193 EP 201 DI 10.1016/j.bone.2004.09.023 PG 9 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA 908PR UT WOS:000227800200002 PM 15780945 ER PT J AU Alekseev, AS Chichinin, IS Korneev, VA AF Alekseev, AS Chichinin, IS Korneev, VA TI Powerful low-frequency vibrators for active seismology SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-FIELDS AB In the past two decades, active seismology studies in Russia have made use of powerful (40- and 100-ton) low-frequency vibrators. These sources create a force amplitude of up to 100 tons and function in the 1.5-3, 3-6, and 5-10 Hz frequency bands. The mobile versions of the vibrator have a force amplitude of 40 tons and a 6-12 Hz frequency band. Recording distances for the 100-ton vibrator are as large as 350 km, enabling the refracted waves to penetrate down to 50 km depths. Vibrator operation sessions are highly repeatable, having distinct "summer" or "winter" spectral patterns. A long profile of seismic records allows estimation of fault zone depths using changes in recorded spectra. Other applications include deep seismic profiling, seismic hazard mapping, structural testing, stress-induced anisotropy studies, seismic station calibration, and large-structure integrity testing. The theoretical description of the low-frequency vibrator is given in the appendices, which contain numerical examples. C1 Russian Acad Sci, Siberian Branch, Inst Computat Math & Math Geophys, Novosibirsk 630090, Russia. Russian Acad Sci, Siberian Branch, Inst Geophys, Novosibirsk 630090, Russia. Natl Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Alekseev, AS (reprint author), Russian Acad Sci, Siberian Branch, Inst Computat Math & Math Geophys, Lavrentieva Pr 6, Novosibirsk 630090, Russia. EM alekseev@sscc.ru; iro@online.sinor.ru; VAKorneev@lbl.gov NR 17 TC 11 Z9 21 U1 0 U2 0 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 USA SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD FEB PY 2005 VL 95 IS 1 BP 1 EP 17 DI 10.1785/0120030261 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 911YL UT WOS:000228042800001 ER PT J AU Johnson, LR Nadeau, RM AF Johnson, LR Nadeau, RM TI Asperity model of an earthquake: Dynamic problem SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Review ID SAN-ANDREAS FAULT; ZONE-GUIDED-WAVES; SMALL REPEATING EARTHQUAKES; SLIP-WEAKENING FRICTION; 3D ELASTIC MEDIUM; DEPENDENT FRICTION; HEAT-FLOW; RUPTURE PROPAGATION; SEISMIC-WAVES; INTERNAL STRUCTURE AB A previous study that presented the static solution for an asperity model of an earthquake is extended to solve the dynamic problem that develops when failure occurs on the boundary of an asperity patch and then spreads over the surrounding displacement shadow region. The boundary integral equation method is coupled with basic constitutive equations for failure and friction to solve the dynamic problem, with different parameters used for the strong asperity patch and weak shadow region. No friction, displacement-weakening friction, and velocity-strengthening friction are all investigated. Depending on the type and amount of friction that is present, the dynamic solutions for slip on the fault exhibit a range of different features, including overshoot of the static solution and oscillation, rupture front velocities that may be greater than or less than the S velocity and change with position, and either total or partial release of the static moment. Common characteristics of the solutions are that failure on the asperity patch is almost independent of failure on the shadow region and that the displacement deficit on the shadow region is released by propagating slip pulses. The stress concentrations of the asperity model are sufficient to produce nonlinear elastic effects in a region extending outward from the fault to distances comparable with the dimensions of the shadow region. Beginning with the solutions for slip on the fault, waveforms are simulated for an earthquake of magnitude M, 1.44 and compared with data recorded at a distance of 8.65 km. Simulations that contain both source and propagation effects are capable of explaining most of the basic features of the observational data, including general agreement with the shape of the waveforms in the time domain, the levels and slopes of the spectra at low frequencies (less than 10 Hz) and at high frequencies (greater than 100 Hz), and some of the interference effects present in both the time and frequency domains. C1 Lawrence Berkeley Natl Lab, Div Earth Sci, Ctr Computat Seismol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley Seismol Lab, Berkeley, CA 94720 USA. RP Lawrence Berkeley Natl Lab, Div Earth Sci, Ctr Computat Seismol, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 102 TC 3 Z9 3 U1 1 U2 2 PU SEISMOLOGICAL SOC AMER PI ALBANY PA 400 EVELYN AVE, SUITE 201, ALBANY, CA 94706-1375 USA SN 0037-1106 EI 1943-3573 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD FEB PY 2005 VL 95 IS 1 BP 75 EP 108 DI 10.1785/0120030093 PG 34 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 911YL UT WOS:000228042800006 ER PT J AU Myers, SC AF Myers, SC TI Comment on "improving sparse network seismic location with Bayesian kriging and teleseismically constrained calibration events - Reply SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Editorial Material C1 Lawrence Livermore Natl Lab, Div Earth Sci, Livermore, CA 94550 USA. RP Myers, SC (reprint author), Lawrence Livermore Natl Lab, Div Earth Sci, POB 808,L-205, Livermore, CA 94550 USA. RI Myers, Stephen/K-1368-2014 OI Myers, Stephen/0000-0002-0315-5599 NR 11 TC 2 Z9 2 U1 0 U2 3 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 USA SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD FEB PY 2005 VL 95 IS 1 BP 370 EP 372 DI 10.1785/0120040120 PG 3 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 911YL UT WOS:000228042800027 ER PT J AU Guidotti, CV Sassi, FP Comodi, P Zanazzi, PF Blencoe, JG AF Guidotti, CV Sassi, FP Comodi, P Zanazzi, PF Blencoe, JG TI Slaty cleavage: Does the crystal chemistry of layer silicates play a role in its development? SO CANADIAN MINERALOGIST LA English DT Article DE slaty cleavage; white micas; chlorite; compressibility; crystal chemistry; periodic bond-chain theory ID EDGE SURFACE-STRUCTURES; EQUATION-OF-STATE; HIGH-PRESSURE; PREFERRED ORIENTATION; METAMORPHIC ROCKS; WHITE MICAS; PETROLOGICAL IMPLICATIONS; MUSCOVITE-PARAGONITE; POWDER DIFFRACTION; CENTRAL WALES AB Much literature exists regarding processes by which shales are transformed into slates. Included are mechanical, physical, and chemical processes. We consider here some aspects not treated by previous authors. Specifically, we consider the manner in which, during such processes, certain special crystal-chemical and physical properties of phyllosilicates might strongly enhance both their ability to form and recrystallize with a strongly preferred orientation, and the development of the P and Q domains. Regarding the crystal-chemical aspects, we call attention to adjustments in the cell dimensions of muscovite and chlorite in response to compositional changes commonly observed when shale is syntectonically transformed into slate. Typically, in slates, the muscovite is phengite-rich, and the chlorite, relatively Al-rich. Phengite-rich muscovite has elongate a and b cell dimensions, but a markedly shortened c dimension compared to pure muscovite. All three cell dimensions of M-rich chlorite are shortened, especially in the c dimension. These changes in cell dimensions in phengite-rich muscovite and chlorite, combined with effects expected according to periodic bond-chain theory, may well energetically facilitate the observed flattening. With regard to physical aspects, we point out the potentially important role of the unusually large compressibility of some phyllosilicates, especially along the c cell dimension, and the control on it of the changes in mineral composition during slate formation. We suggest that to varying degrees, these special crystal-chemical and physical properties of phyllosilicates may contribute significantly to the relative ease of development of the typical structure of slates. C1 Univ Maine, Dept Geol Sci, Orono, ME 04469 USA. Univ Padua, Dipartimento Mineral & Petrol, I-35137 Padua, Italy. Dipartimento Sci Terra, I-06100 Perugia, Italy. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. RP Guidotti, CV (reprint author), Univ Maine, Dept Geol Sci, Orono, ME 04469 USA. EM guidotti@maine.edu; francesco.sassi@unipd.it OI COMODI, Paola/0000-0002-1899-0589 NR 82 TC 5 Z9 6 U1 1 U2 8 PU MINERALOGICAL ASSOC CANADA PI QUEBEC PA 490, RUE DE LA COURONNE, QUEBEC, QC G1K 9A9, CANADA SN 0008-4476 EI 1499-1276 J9 CAN MINERAL JI Can. Mineral. PD FEB PY 2005 VL 43 BP 311 EP 325 DI 10.2113/gscanmin.43.1.311 PN 1 PG 15 WC Mineralogy SC Mineralogy GA 916LN UT WOS:000228386500016 ER PT J AU Nayak, T Norenberg, J Anderson, T Atcher, R AF Nayak, T Norenberg, J Anderson, T Atcher, R TI A comparison of high- versus low-linear energy transfer somatostatin receptor targeted radionuclide therapy in vitro SO CANCER BIOTHERAPY AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 1st International Symposium on Radionuclide Therapy and Radiopharmaceutical Dosimetry CY SEP 04-08, 2004 CL Helsinki, FINLAND DE linear energy transfer; somatostatin receptor radionucleotide therapy; apoptosis; preclinical cellular dosimetry ID ALPHA-PARTICLE IRRADIATION; APOPTOSIS; Y-90; LU-177 AB Introduction: The somatostatin analog [DOTA(0)-Tyr(3)]-octreotide (DOTATOC) has been widely used to target somatostatin receptor expressing tumors for therapy using radionuclides such as Y-90 or Lu-177. Aim: This aim of this study was to compare the effects of DOTATOC labeled to high linear energy transfer (LET) alpha-emitter Bi-213 and low-LET beta-emitter Lu-177 in vitro. Materials and Methods: Somatostatin receptor (sstr)-positive cell line Capan-2 and sstr-negative control cell line A549 were used for the experiments. The effects of two exposure times using different radiation doses of high-LET alpha-emitter Bi-213 and low-LET beta-emitter Lu-177 were investigated using cell survival assay. The apoptotic effects were investigated using Cell Death Detection ELISA(PLUS)10X. The cumulated activity and the mean absorbed dose per unit cumulated activity were calculated using MIRD cellular S-values. Results: Bi-213-DOTATOC had an approximately four times greater induction of apoptosis than Lu-177-DOTATOC and a 100 times greater induction of apoptosis than nonradiolabeled DOTATOC. Nonspecific radiolabeled tetra-azacyclododecanetetra-acetic acid (DOTA) had a less pronounced effect on the cell survival and apoptosis, as compared to the sstr-specific radiolabeled DOTATOC. Conclusion: Bi-213-DOTATOC is significantly more potent than Lu-177-DOTATOC in vitro because of its high-LET alpha-emission. Bi-213-DOTATOC shows enhanced effects on mitotic and apoptotic cell deaths. C1 Univ New Mexico, Coll Pharm, Hlth Sci Ctr, Radiopharmaceut Sci Program, Albuquerque, NM 87131 USA. Los Alamos Natl Lab, Biosci Div, Los Alamos, NM USA. RP Norenberg, J (reprint author), Univ New Mexico, Coll Pharm, Hlth Sci Ctr, Radiopharmaceut Sci Program, 2502 Marble Ave,NE MSC09 5360, Albuquerque, NM 87131 USA. EM jpnoren@unm.edu OI Atcher, Robert/0000-0003-4656-2247; Nayak, Tapan/0000-0002-3706-6092 NR 17 TC 14 Z9 14 U1 0 U2 0 PU MARY ANN LIEBERT INC PI NEW ROCHELLE PA 140 HUGUENOT STREET, 3RD FL, NEW ROCHELLE, NY 10801 USA SN 1084-9785 J9 CANCER BIOTHER RADIO JI Cancer Biother. Radiopharm. PD FEB PY 2005 VL 20 IS 1 BP 52 EP 57 DI 10.1089/cbr.2005.20.52 PG 6 WC Oncology; Medicine, Research & Experimental; Pharmacology & Pharmacy; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Research & Experimental Medicine; Pharmacology & Pharmacy; Radiology, Nuclear Medicine & Medical Imaging GA 912YO UT WOS:000228116400008 PM 15778581 ER PT J AU Ege, C Majewski, J Wu, GH Kjaer, K Lee, KYC AF Ege, C Majewski, J Wu, GH Kjaer, K Lee, KYC TI Templating effect of lipid membranes on Alzheimer's amyloid beta peptide SO CHEMPHYSCHEM LA English DT Article DE Alzheimer's disease; monolayers; phospholipids; X-ray diffraction; X-ray reflectivity ID STRUCTURAL-PROPERTIES; MONOLAYERS; MECHANISM; FIBRILS; DISEASE C1 Univ Chicago, James Franck Inst, Dept Chem, Chicago, IL 60637 USA. Univ Chicago, Inst Biophys Dynam, Chicago, IL 60637 USA. Los Alamos Natl Lab, Los Alamos Neutron Scattering Ctr, Los Alamos, NM 87545 USA. Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark. RP Lee, KYC (reprint author), Univ Chicago, James Franck Inst, Dept Chem, Chicago, IL 60637 USA. EM kayeelee@uchicago.edu RI Lujan Center, LANL/G-4896-2012 NR 19 TC 32 Z9 32 U1 1 U2 8 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 1439-4235 J9 CHEMPHYSCHEM JI ChemPhysChem PD FEB PY 2005 VL 6 IS 2 BP 226 EP 229 DI 10.1002/cphc.200400468 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 899QK UT WOS:000227159400004 PM 15751341 ER PT J AU Gomes-Solecki, MJC Savitt, AG Rowehl, R Glass, JD Bliska, JB Dattwyler, RJ AF Gomes-Solecki, MJC Savitt, AG Rowehl, R Glass, JD Bliska, JB Dattwyler, RJ TI LcrV capture enzyme-linked immunosorbent assay for detection of Yersinia pestis from human samples SO CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY LA English DT Article ID V-ANTIGEN; PNEUMONIC PLAGUE; VIRULENCE PLASMID; ENTEROCOLITICA; PROTEIN; PSEUDOTUBERCULOSIS; SURFACE; MICE AB In the United States, there is currently a major gap in the diagnostic capabilities with regard to plague. To address this, we developed an antigen capture assay using an essential virulence factor secreted by Yersinia spp., LcrV, as the target antigen. We generated anti-LcrV monoclonal antibodies (MAbs) and screened them for the ability to bind bacterially secreted native Yersinia pestis LcrV. Anti-LcrV MAb 19.31 was used as a capture antibody, and biotinylated MAb 40.1 was used for detection. The detection limit of this highly sensitive Yersinia LcrV capture enzyme-linked immunosorbent assay is 0.1 ng/ml. The assay detected LcrV from human sputum and blood samples treated with concentrations as low as 0.5 ng/ml of bacterially secreted native Y. pestis LcrV. This assay could be used as a tool to help confirm the diagnosis of plague in patients presenting with pneumonia. C1 SUNY Stony Brook, Ctr Infect Dis, Stony Brook, NY 11794 USA. SUNY Stony Brook, Dept Mol Genet & Microbiol, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Dattwyler, RJ (reprint author), New York Med Coll, Dept Microbiol & Immunol, BSB 308, Valhalla, NY 10595 USA. EM Raymond_Dattwyler@nymc.edu OI Dattwyler, Raymond/0000-0002-1983-1301 FU NIAID NIH HHS [1U54AI57185, 1R43AI52902] NR 24 TC 14 Z9 16 U1 0 U2 4 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 1071-412X J9 CLIN DIAGN LAB IMMUN JI Clin. Diagn. Lab. Immunol. PD FEB PY 2005 VL 12 IS 2 BP 339 EP 346 DI 10.1128/CDLI.12.2.339-346.2005 PG 8 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA 955AG UT WOS:000231196400016 PM 15699431 ER PT J AU Verspoor, K AF Verspoor, K TI Towards a semantic lexicon for biological language processing SO COMPARATIVE AND FUNCTIONAL GENOMICS LA English DT Article; Proceedings Paper CT ISMB BioLink 2004 Meeting CY 2004 CL Glasgow, SCOTLAND DE natural language processing; lexicon; unified medical language system AB This paper explores the use of the resources in the National Library of Medicine's Unified Medical Language System (UMLS) for the construction of a lexicon useful for processing texts in the field of molecular biology. A lexicon is constructed from overlapping terms in the UMLS SPECIALIST lexicon and the UMLS Metathesaurus to obtain both morphosyntactic and semantic information for terms, and the coverage of a domain corpus is assessed. Over 77% of tokens in the domain corpus are found in the constructed lexicon, validating the lexicon's coverage of the most frequent terms in the domain and indicating that the constructed lexicon is potentially an important resource for biological text processing. Copyright (c) 2005 John Wiley T Sons, Ltd. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Verspoor, K (reprint author), Los Alamos Natl Lab, POB 1663,MS B256, Los Alamos, NM 87545 USA. EM verspoor@lanl.gov RI Verspoor, Karin/B-8173-2009; Verspoor, Karin/G-6034-2016 OI Verspoor, Karin/0000-0002-8661-1544; Verspoor, Karin/0000-0002-8661-1544 NR 6 TC 6 Z9 6 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 1531-6912 J9 COMP FUNCT GENOM JI Compar. Funct. Genom. PD FEB-MAR PY 2005 VL 6 IS 1-2 BP 61 EP 66 DI 10.1002/cfg.451 PG 6 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA 909LE UT WOS:000227860600004 PM 18629302 ER PT J AU Levine, RA Yu, ZX Hanley, WG Nitao, JJ AF Levine, RA Yu, ZX Hanley, WG Nitao, JJ TI Implementing componentwise Hastings algorithms SO COMPUTATIONAL STATISTICS & DATA ANALYSIS LA English DT Article DE Markov chain Monte Carlo; metropolis algorithm; Gibbs sampler; adaptive sweep strategies; random proposal distributions ID METROPOLIS ALGORITHM; BAYESIAN COMPUTATION; GIBBS SAMPLER; MARKOV-CHAINS AB Markov chain Monte Carlo (MCMC) routines have revolutionized the application of Monte Carlo methods in statistical application and statistical computing methodology. The Hastings sampler, encompassing both the Gibbs and Metropolis samplers as special cases, is the most commonly applied MCMC algorithm. The performance of the Hastings sampler relies heavily on the choice of sweep strategy, that is, the method by which the components or blocks of the random variable X of interest are visited and updated, and the choice of proposal distribution, that is the distribution from which candidate variates are drawn for the accept-reject rule in each iteration of the algorithm. We focus on the random sweep strategy, where the components of X are updated in a random order, and random proposal distributions, where the proposal distribution is characterized by a randomly generated parameter. We develop an adaptive Hastings sampler which learns from and adapts to random variates generated during the algorithm towards choosing the optimal random sweep strategy and proposal distribution for the problem at hand. As part of the development, we prove convergence of the random variates to the distribution of interest and discuss practical implementations of the methods. We illustrate the results presented by applying the adaptive componentwise Hastings samplers developed to sample multivariate Gaussian target distributions and Bayesian frailty models. (C) 2004 Elsevier B.V. All rights reserved. C1 San Diego State Univ, Dept Math & Stat, San Diego, CA 92128 USA. Rice Univ, Dept Stat, Houston, TX 77251 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Levine, RA (reprint author), San Diego State Univ, Dept Math & Stat, 5500 Campanile Dr, San Diego, CA 92128 USA. EM ralevine@sciences.sdsu.edu NR 23 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9473 J9 COMPUT STAT DATA AN JI Comput. Stat. Data Anal. PD FEB 1 PY 2005 VL 48 IS 2 BP 363 EP 389 DI 10.1016/j.csda.2004.02.002 PG 27 WC Computer Science, Interdisciplinary Applications; Statistics & Probability SC Computer Science; Mathematics GA 887TP UT WOS:000226328700009 ER PT J AU Tomov, S McGuigan, M Bennett, R Smith, G Spiletic, J AF Tomov, S McGuigan, M Bennett, R Smith, G Spiletic, J TI Benchmarking and implementation of probability-based simulations on programmable graphics cards SO COMPUTERS & GRAPHICS-UK LA English DT Article; Proceedings Paper CT International Conference on Virtural Reality Continuum and Its Applications in Industry (VRCAI) CY JUN 15-18, 2004 CL Univ Singapore, Nanyang Technol, Singapore, SINGAPORE HO Univ Singapore, Nanyang Technol DE computer graphics methodologies; hardware architecture (graphics processors); simulation and modeling; (applications Monte Carlo simulations); computer systems organization; performance of systems AB The latest graphics processing units (GPUs) are reported to reach up to 200 billion floating point operations per second (200 Gflops (Spode's Abode, GeForce FX Preview (N-V30), Spode, November (2002), Internet address (accessed on 10/2003): http://www.spodesabode.com/content/article/geforcefx)) and to have price performance of 0.1 cents per Mflop. These facts raise great interest in the plausibility of extending the GPUs' use to non-graphics applications, in particular numerical simulations on structured grids (lattice). In this paper we (1) review previous works on using GPUs for non-graphics applications, (2) implement probability-based simulations on the GPU, namely the Ising and percolation models, (3) implement vector operation benchmarks for the GPU, and finally (4) compare the CPU's and GPU's performance. Original contribution of this work is implementing Monte Carlo type simulations on the GPU. Such simulations have a wide area of applications. They are computationally intensive and, as we show in the paper, lend themselves naturally to implementation on GPUs, therefore allowing us to better use the GPU's computational power and speed up the computation. A general conclusion from the results obtained is that moving computations from the CPU to the GPU is feasible, yielding good time and price performance, for certain lattice computations. Preliminary results also show that it is feasible to use them in parallel. (c) 2004 Published by Elsevier Ltd. C1 Brookhaven Natl Lab, Div Informat Technol, Upton, NY 11973 USA. RP Tomov, S (reprint author), Brookhaven Natl Lab, Div Informat Technol, Bldg 515, Upton, NY 11973 USA. EM tomov@cs.utk.edu; mcguigan@bnl.gov; robertb@bnl.gov; smith3@bnl.gov; spiletic@bnl.gov NR 21 TC 25 Z9 26 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0097-8493 J9 COMPUT GRAPH-UK JI Comput. Graph.-UK PD FEB PY 2005 VL 29 IS 1 BP 71 EP 80 DI 10.1016/j.cag.2004.11.008 PG 10 WC Computer Science, Software Engineering SC Computer Science GA 905TB UT WOS:000227591600008 ER PT J AU Schultz, E AF Schultz, E TI Malware update SO COMPUTERS & SECURITY LA English DT News Item C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Schultz, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Cyclotron Rd,MS 50A-3111, Berkeley, CA 94720 USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER ADVANCED TECHNOLOGY PI OXFORD PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0167-4048 J9 COMPUT SECUR JI Comput. Secur. PD FEB PY 2005 VL 24 IS 1 BP 1 EP 9 DI 10.1016/j.cose.2004.12.001 PG 9 WC Computer Science, Information Systems SC Computer Science GA 896TL UT WOS:000226956400001 ER PT J AU Cummins, SJ Francois, MM Kothe, DB AF Cummins, SJ Francois, MM Kothe, DB TI Estimating curvature from volume fractions SO COMPUTERS & STRUCTURES LA English DT Article DE distance functions; volume-of-fluid; curvature; height function; smoothing kernels ID COUPLED LEVEL SET; OF-FLUID METHOD; TRACKING METHOD; FLOWS AB An interface represented by discrete, abruptly-varying volume fractions poses particular challenges for the accurate estimation of interfacial curvature. Most approaches within a volume-of-fluid (VOF) framework do not estimate curvature directly from the VOF function, but instead from a smoothly-varying function derived from some mapping (e.g., convolution, discrete quadrature) of the VOF function. In this study we assess and compare the accuracy and robustness of curvature estimates derived from three smooth, VOF-based functions: a convolved VOF (CV) function, a height function (HF), and a reconstructed distance function (RDF). The methodology used in reconstructing a distance function from volume fractions is new and therefore presented in detail along with an analysis of the resulting sensitivities. We find that curvature estimates derived from the height function provide superior results, as measured in smaller error and higher (second-order) convergence rate. While curvature estimates from the RDF provides smaller errors relative to those derived from the CV, both techniques exhibit similar convergence behaviour. Numerical results, including a new cosine wave verification test, are presented to substantiate the findings. Published by Elsevier Ltd. C1 Los Alamos Natl Lab, Comp & Computat Sci Div, Los Alamos, NM 87545 USA. RP Cummins, SJ (reprint author), Los Alamos Natl Lab, Comp & Computat Sci Div, POB 1663, Los Alamos, NM 87545 USA. EM scummins@lanl.gov; mmfran@lanl.gov; dbk@lanl.gov RI Cummins, Sharen/D-4842-2009; Francois, Marianne/B-2423-2012 OI Cummins, Sharen/0000-0001-7745-1393; NR 14 TC 129 Z9 129 U1 1 U2 22 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD FEB PY 2005 VL 83 IS 6-7 BP 425 EP 434 DI 10.1016/j.compstruc.2004.08.017 PG 10 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA 901WM UT WOS:000227312900004 ER PT J AU Malony, A Shende, S Trebon, N Ray, J Armstrong, R Rasmussen, C Sottile, M AF Malony, A Shende, S Trebon, N Ray, J Armstrong, R Rasmussen, C Sottile, M TI Performance technology for parallel and distributed component software SO CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE LA English DT Article DE component software; performance; parallel; distributed; optimization ID SHOCK HYDRODYNAMICS AB This work targets the emerging use of software component technology for high-performance scientific parallel and distributed computing. While component software engineering will benefit the construction of complex science applications, its use presents several challenges to performance measurement, analysis, and optimization. The performance of a component application depends on the interaction (possibly nonlinear) of the composed component set. Furthermore, a component is a 'binary unit of composition' and the only information users have is the interface the component provides to the outside world. A performance engineering methodology and development approach is presented to address evaluation and optimization issues in high-performance component environments. We describe a prototype implementation of a performance measurement infrastructure for the Common Component Architecture (CCA) system. A case study demonstrating the use of this technology for integrated measurement, monitoring, and optimization in CCA component-based applications is given. Copyright (C) 2005 John Wiley Sons, Ltd. C1 Univ Oregon, Dept Comp & Informat Sci, Eugene, OR 97403 USA. Sandia Natl Labs, Livermore, CA 94551 USA. Los Alamos Natl Lab, Adv Comp Lab, Los Alamos, NM 87545 USA. RP Univ Oregon, Dept Comp & Informat Sci, Eugene, OR 97403 USA. EM malony@cs.uoregon.edu NR 26 TC 4 Z9 5 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 1532-0626 EI 1532-0634 J9 CONCURR COMP-PRACT E JI Concurr. Comput.-Pract. Exp. PD FEB-APR PY 2005 VL 17 IS 2-4 BP 117 EP 141 DI 10.1002/cpe.931 PG 25 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA 903XZ UT WOS:000227460200003 ER PT J AU Vadhiyar, SS Dongarra, JJ AF Vadhiyar, SS Dongarra, JJ TI Self adaptivity in Grid computing SO CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE LA English DT Article DE self adaptivity; migration; GrADS; rescheduling; redistribution; checkpointing ID MIGRATION; SOFTWARE; SYSTEMS AB Optimizing a given software system to exploit the features of the underlying system has been an area of research for many years. Recently, a number of self-adapting software systems have been designed and developed for various computing environments. In this paper, we discuss the design and implementation of a software system that dynamically adjusts the parallelism of applications executing on computational Grids in accordance with the changing load characteristics of the underlying resources. The migration framework implemented by our software system is aimed at performance-oriented Grid systems and implements tightly coupled policies for both suspension and migration of executing applications. The suspension and migration policies consider both the load changes on systems as well as the remaining execution times of the applications thereby taking into account both system load and application characteristics. The main goal of our migration framework is to improve the response times for individual applications. We also present some results that demonstrate the usefulness of our migration framework. Published in 2005 by John Wiley Sons,Ltd. C1 Indian Inst Sci, Supercomp Educ & Res Ctr, Bangalore 560012, Karnataka, India. Univ Tennessee, Dept Comp Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Indian Inst Sci, Supercomp Educ & Res Ctr, Bangalore 560012, Karnataka, India. EM vss@serc.iisc.ernet.in RI Dongarra, Jack/E-3987-2014 NR 34 TC 56 Z9 57 U1 0 U2 2 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 1532-0626 EI 1532-0634 J9 CONCURR COMP-PRACT E JI Concurr. Comput.-Pract. Exp. PD FEB-APR PY 2005 VL 17 IS 2-4 BP 235 EP 257 DI 10.1002/cpe.927 PG 23 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA 903XZ UT WOS:000227460200008 ER PT J AU Espenson, JH AF Espenson, JH TI Related rhenium(V) catalysts adopt different mechanisms for oxygen atom transfer SO COORDINATION CHEMISTRY REVIEWS LA English DT Review DE heterocycles; ligand; catalyst; oxygen atom transfer ID OXORHENIUM(V) COMPLEXES; PHOTOCHEMICAL REACTIONS; SUBSTITUTION-REACTIONS; TRACER EXPERIMENTS; KINETICS; DIMER; MONOMERIZATION; EXCHANGE; LIGANDS; OXIDATION AB The chemical mechanisms for three related rhenium(V) catalysts of oxygen atom transfer reactions are reviewed. Two of the catalysts are compounds with a single rhenium atom, [MeReE(mtp)(PPh3)], where E is either O (1) or S (2) and mtpH(2) is 2-(mercaptomethyl)thiophenol; the third is the di-rhenium compound {MeReO(mtp)}(2) (3). In each of them, the Re atom is square-pyramidal, sitting slightly above the approximate basal plane defined by S, S, C, and P; the oxo or thio group occupies the axial position. They all catalyze oxygen atom transfer from pyridine N-oxides to PAr3. The reaction rates are in the orders 3 much greater than 1 much greater than 2; even more striking is that the rate laws for the trio of catalysts is distinctly different. This signals the intervention of different chemical steps and intermediates. (C) 2004 Elsevier B.V. All rights reserved. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. RP Espenson, JH (reprint author), Iowa State Univ Sci & Technol, Ames Lab, 25 Speeding Hall, Ames, IA 50011 USA. EM espenson@iastate.edu NR 46 TC 67 Z9 67 U1 2 U2 10 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0010-8545 J9 COORDIN CHEM REV JI Coord. Chem. Rev. PD FEB PY 2005 VL 249 IS 3-4 BP 329 EP 341 DI 10.1016/j.ccr.2004.06.018 PG 13 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 900HX UT WOS:000227207100006 ER PT J AU Creutz, C Chou, MH Fujita, E Szalda, DJ AF Creutz, C Chou, MH Fujita, E Szalda, DJ TI Reactions of hydroxymethyl and hydride complexes in water: synthesis, structure and reactivity of a hydroxymethyl-cobalt complex SO COORDINATION CHEMISTRY REVIEWS LA English DT Review DE hydroxymethyl complex; hydride complex; water reduction mechanism ID MOLECULAR-HYDROGEN COMPLEXES; CARBON-DIOXIDE ACTIVATION; ALIPHATIC FREE-RADICALS; ONE-ELECTRON REDUCTION; AQUEOUS-SOLUTIONS; PULSE-RADIOLYSIS; HOMOGENEOUS CATALYSIS; VISIBLE-LIGHT; MACROCYCLIC LIGANDS; ELECTROCHEMICAL REDUCTION AB The properties and reactions of hydroxymethyl and hydride complexes are surveyed with an emphasis on their aqueous chemistry; then the syntheses and reactions found for macrocyclic cobalt complexes of these ligands are presented. The hydroxymethyl-cobalt(III) complex was prepared by addition of the photogenerated CH2OH radical to the cobalt(H) macrocycle N-meso-CoHMD2+ (HMD = 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) in 0.1 M perchloric acid and characterized by an X-ray crystallographic study and spectroscopic characterization in solution. Acidic aqueous solutions are fairly stable and the complex decomposes, with formaldehyde elimination, by a base-catalyzed pathway. At 25 degreesC, formaldehyde elimination proceeds with the rate law -d[N-meso-CoHMD(CH2OH)(2+)]/dt = k(1)[N-meso-CoHMD(CH2OH)(2+)]/[H+], with k(1) = (3.5 +/- 0.5) x 10(-9) M s(-1) at pH 4-7 and 0.5 M ionic strength to yield the hydride complex, N-meso-CoHMD(H)(2+) and CH2O. In a subsequent stage, N-meso-CoHMD 2+ and H, form with the rate law-d[N-meso-CoHMD(H)(2+)]/dt=(2 +/- 1) x 10(-7) [N-meso-CoHMD(H)(2+)](2)/[H+] s(-1) at pH 4.5-8 and 0.5 M ionic strength. Ultimately, the N-meso complex isomerizes to yield N-rac-CoHMD2+ with previously observed kinetics. (C) 2004 Elsevier B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Creutz, C (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM ccreutz@bnl.gov RI Fujita, Etsuko/D-8814-2013 NR 107 TC 14 Z9 14 U1 1 U2 22 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0010-8545 J9 COORDIN CHEM REV JI Coord. Chem. Rev. PD FEB PY 2005 VL 249 IS 3-4 BP 375 EP 390 DI 10.1016/j.ccr.2004.08.027 PG 16 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 900HX UT WOS:000227207100008 ER PT J AU Huynh, MHV Dattelbaum, DM Meyer, TJ AF Huynh, MHV Dattelbaum, DM Meyer, TJ TI Exited state electron and energy transfer in molecular assemblies SO COORDINATION CHEMISTRY REVIEWS LA English DT Review DE metal-to-ligand charge transfer; excited state; photophysics; electron transfer; energy transfer; artificial photosynthesis; molecular assemblies; polystyrene; polymers; oligopeptides ID CHROMOPHORE-QUENCHER COMPLEX; TRANSITION-METAL COMPLEXES; TRANSFER EXCITED-STATES; BRIDGING LIGAND 2,3,5,6-TETRAKIS(2-PYRIDYL)PYRAZINE; POLYMERS INCORPORATING 2,2'-BIPYRIDINES; TIME-RESOLVED SPECTROSCOPY; MIXED-VALENCE DIMERS; CHARGE-TRANSFER; INTRAMOLECULAR ELECTRON; POLYPYRIDYL COMPLEXES AB The metal-to-ligand charge transfer (MLCT) excited states of polypyridyl complexes of the d(6) ions Ru(II), Os(II), and Re(l) have provided the basis for many studies on photochemical electron and energy transfer. In this account, a brief review of photochemical electron transfer by [Ru(bpy)(3)](2+*) is given, followed by an update on MLCT excited state molecular and electronic structure, and an introduction to photochemical electron and energy transfer in molecular assemblies. The majority of the account is devoted to describing the evolution of two approaches to preparing complex molecular assemblies for the study of photochemical electron and energy transfer both inspired by the demands of achieving artificial photosynthesis. The first approach involves the derivatization of preformed polystyrene by added chromophores and electron or energy transfer donors or acceptors and three generations of polymers differing in polymer content and linkage strategies. The second approach has exploited solid-state peptide synthesis and the stepwise preparation of oligopeptides with spatial control of added groups and alignment on the resulting helical scaffolds. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Dynam Expt Div, Mat & Dynam Grp, Los Alamos, NM 87545 USA. RP Meyer, TJ (reprint author), Los Alamos Natl Lab, Dynam Expt Div, Mat & Dynam Grp, MS A127, Los Alamos, NM 87545 USA. EM tjmeyer@lanl.gov NR 163 TC 163 Z9 164 U1 7 U2 59 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0010-8545 J9 COORDIN CHEM REV JI Coord. Chem. Rev. PD FEB PY 2005 VL 249 IS 3-4 BP 457 EP 483 DI 10.1016/j.ccr.2004.07.005 PG 27 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 900HX UT WOS:000227207100013 ER PT J AU Distefano, AJ Wishart, JF Isied, SS AF Distefano, AJ Wishart, JF Isied, SS TI Convergence of spectroscopic and kinetic electron transfer parameters for mixed-valence binuclear dipyridylamide ruthenium ammine complexes SO COORDINATION CHEMISTRY REVIEWS LA English DT Review DE binuclear ruthenium(II,III); hush theory ID TRANSITION-METAL-COMPLEXES; CHARGE-TRANSFER STATES; ELECTROABSORPTION SPECTROSCOPY; PENTAAMMINERUTHENIUM COMPLEXES; INTERVALENCE TRANSFER; BRIDGED COMPLEXES; TRANSFER RATES; LIGAND; DELOCALIZATION; MOLECULES AB A series of binuclear ruthenium(II,III) pentaammine complexes bridged by 4-pyridyl isonicotinamide (iso-apy) and methyl,4-pyridyl isonicotinamide (iso-mapy), and their mononuclear congeners, were studied by spectroscopic and kinetic techniques. The amide functionality provides asymmetry between the electronic environments of the metal ions bound to the aminopyridine (apy) and pyridine carbonyl (iso) ends. The resulting difference is observed in the charge transfer spectra and the electrochemical properties of the mononuclear and binuclear complexes. The mixed-valence binuclear ruthenium(II,III) complexes exhibit bands in the NIR region assigned to intervalence charge transfer transitions between the metal centers (MMCT). The MMCT band for [(NH3)(5)Ru-iso-apy-Ru(NH3)(5)](5+) has lambda(max) = 809 nm and epsilon(max) = 50 M-1 cm(-1) and [(NH3)(5)Ru-iso-mapy-Ru(NH3)(5)](5+) has lambda(max) = 743 nm and epsilon(max) = 20 M-1 cm(-1). Methylation of the amide nitrogen increases the energy of the MMCT transition while decreasing the electronic coupling between the two metal centers. The electronic coupling constants (H-MM') for the mixed-valence complexes were evaluated from the metal-to-ligand and metal-to-metal charge transfer spectra using both Hush's model and the CNS method. The spectroscopy shows that electronic coupling is more efficient when the bridging ligand can adopt a more planar configuration. The kinetics of the spontaneous (thermal) intramolecular ET reactions in the binuclear ruthenium pentaammine systems of iso-mapy and iso-apy were studied using pulse radiolysis transient absorption spectroscopy. An ET rate constant of 2.7 x 10(6) s(-1) was obtained for [(NH3)(5)Ru-iso-mapy-Ru(NH3)(5)](5+), while only a lower limit for the thermal reaction rate constant could be obtained for [(NH3)(5)Ru-iso-apy-Ru(NH3)(5)](5+). The estimated ET rate constants calculated by Hush's model are slightly faster than those directly obtained through kinetic measurements. (C) 2004 Elsevier B.V. All rights reserved. C1 Rutgers State Univ, Dept Chem & Biol Chem, Piscataway, NJ 08854 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Wishart, JF (reprint author), Rutgers State Univ, Dept Chem & Biol Chem, Piscataway, NJ 08854 USA. EM wishart@bnl.gov; isied@rutchem.rutgers.edu RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 41 TC 28 Z9 28 U1 2 U2 17 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0010-8545 J9 COORDIN CHEM REV JI Coord. Chem. Rev. PD FEB PY 2005 VL 249 IS 3-4 BP 507 EP 516 DI 10.1016/j.ccr.2004.09.008 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 900HX UT WOS:000227207100016 ER PT J AU Soika, R Ghosh, AK AF Soika, R Ghosh, AK TI Interstrand resistances in cored Rutherford-type superconducting cables SO CRYOGENICS LA English DT Article DE interstrand resistance; cored Rutherford cable; Ac-losses ID LHC MAIN MAGNETS; SYNCHROTRON; GSI AB The network model of interstrand contact resistances (ICRs) is often used to describe the flow of interstrand coupling currents in Rutherford cables, and to predict the contribution of these currents to the ac losses of such cables. Recent evidence indicates that in cored Rutherford cables, the interstrand resistances are significantly lower in the cable edge region than they are in the flat area of the cable. To investigate these non-uniformities, the VI method was used to determine voltage profiles for cored cables of varying length. The results of the measurements have implications for both the measurement of ICRs via the VI method, and the calculation of ac losses. Published by Elsevier Ltd. C1 Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. RP Ghosh, AK (reprint author), Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. EM aghosh@bnl.gov NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD FEB PY 2005 VL 45 IS 2 BP 149 EP 154 DI 10.1016/j.cryogenics.2004.07.003 PG 6 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA 887AG UT WOS:000226274000008 ER PT J AU Sawyer, RH Rogers, L Washington, L Glenn, TC Knapp, LW AF Sawyer, RH Rogers, L Washington, L Glenn, TC Knapp, LW TI Evolutionary origin of the feather epidermis SO DEVELOPMENTAL DYNAMICS LA English DT Review DE feather origin; evolution; alligator; avian mutant; ectoderm; epidermis; ectodermal placode; embryonic layers; beta-keratins ID AVIAN SCALE DEVELOPMENT; BETA BETA KERATINS; ALLIGATOR ALLIGATOR-MISSISSIPPIENSIS; SPHENODON-PUNCTATUS SPHENODONTIDA; DERMAL TISSUE INTERACTIONS; CHICK-EMBRYO INTEGUMENT; ANTERIOR SHANK SKIN; SCUTATE SCALES; CELL-PROLIFERATION; DEVELOPMENTAL EVOLUTION AB The formation of scales and feathers in reptiles and birds has fascinated biologists for decades. How might the developmental processes involved in the evolution of the amniote ectoderm be interpreted to shed light on the evolution of integumental appendages? An Evo-Devo approach to this question is proving essential to understand the observation that there is homology between the transient embryonic layers covering the scale epidermis of alligators and birds and the epidermal cell populations of embryonic feather filaments. Whereas the embryonic layers of scutate scales are sloughed off at hatching, that their homologues persist in feathers demonstrates that the predecessors of birds took advantage of the ability of their ectoderm to generate embryonic layers by recruiting them to make the epidermis of the embryonic feather filament. Furthermore, observations on mutant chickens with altered scale and feather development (Abbott and Asmundson [1957] J. Hered. 18:63-70; Abbott [1965] Poult. Sci. 44:1347; Abbott [1967] Methods in developmental biology. New York: Thomas Y. Crowell) suggest that the ectodermal placodes of feathers, which direct the formation of unique dermal condensations and subsequently appendage outgrowth, provided the mechanism by which the developmental processes generating the embryonic layers diverged during evolution to support the morphogenesis of the epidermis of the primitive feather filament with its barb ridges. (C) 2005 Wiley-Liss, Inc. C1 Univ S Carolina, Dept Biol Sci, Columbia, SC 29802 USA. Savannah River Ecol Lab, Aiken, SC USA. RP Sawyer, RH (reprint author), Univ S Carolina, Dept Biol Sci, Columbia, SC 29802 USA. EM sawyer@cosm.psc.sc.edu RI Glenn, Travis/A-2390-2008 NR 135 TC 23 Z9 24 U1 3 U2 18 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 1058-8388 J9 DEV DYNAM JI Dev. Dyn. PD FEB PY 2005 VL 232 IS 2 BP 256 EP 267 DI 10.1002/dvdy.20291 PG 12 WC Anatomy & Morphology; Developmental Biology SC Anatomy & Morphology; Developmental Biology GA 889KC UT WOS:000226440900002 PM 15637693 ER PT J AU Newton, RL Davidson, JL Lance, MJ AF Newton, RL Davidson, JL Lance, MJ TI Raman microscopic characterization of proton-irradiated polycrystalline diamond films SO DIAMOND AND RELATED MATERIALS LA English DT Article DE diamond film; microelectromechanical systems (MEMS); radiation-induced effects ID ION-IMPLANTATION; DAMAGE AB The microstructural effects of irradiating polycrystalline diamond films with protons was examined. The dosages ranged from 10(15) to 10(17) H+/cm(2). Scanning electron microscopy (SEM) and Raman microscopy were used to examine the ion implantation related changes as a function of depth. The results indicate that single crystal diamond and polycrystalline diamond exhibit similar behavior with respect to predicted vs. actual ion implant range, microstructural damage, and ion behavior both along the implant path and near the stopping location of the ions. Published by Elsevier B.V. C1 NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Newton, RL (reprint author), NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA. EM robby.newton@nasa.gov RI Lance, Michael/I-8417-2016 OI Lance, Michael/0000-0001-5167-5452 NR 10 TC 4 Z9 4 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD FEB PY 2005 VL 14 IS 2 BP 173 EP 178 DI 10.1016/j.diamond.2004.09.008 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA 899UK UT WOS:000227170600006 ER PT J AU Jacobsohn, LG Nastasi, M Daemen, LL Jenei, Z Asoka-Kumar, P AF Jacobsohn, LG Nastasi, M Daemen, LL Jenei, Z Asoka-Kumar, P TI Positron annihilation spectroscopy of sputtered boron carbide films SO DIAMOND AND RELATED MATERIALS LA English DT Article DE positron annihilation spectroscopy; sputter deposition; boron carbide; defects ID X-RAY-SCATTERING; AMORPHOUS-CARBON; ION-BOMBARDMENT; THIN-FILMS; DEPOSITION; MICROSTRUCTURE; DEFECTS; GROWTH; MODEL AB Positron annihilation spectroscopy (PAS) was carried out on boron carbide films deposited by sputtering and the results correlated to the bombardment conditions during film growth. Films were deposited with substrate bias voltages in the range of 0 to -200 V with a working pressure of 5 mTorr of Ar. Films deposited with bias voltages from -100 to -200 V present the same type of defect and the defect concentration increased linearly with the bias voltage. This defect was ascribed to vacancies in agreement with Monte Carlo simulations of Ar+ bombardment of boron carbide. On the other hand, films deposited with 0 V bias presented a higher S parameter values, whose origin was tentatively attributed to a relatively more open nanosized columnar structure, as suggested by the structure zone model. Annealing up to 800 degreesC for 30 min did not change the defect content. (C) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Jacobsohn, LG (reprint author), Los Alamos Natl Lab, Mat Sci & Technol Div, POB 1663,MST-8 G755, Los Alamos, NM 87545 USA. EM lgjacob@lanl.gov RI Jenei, Zsolt/B-3475-2011; Lujan Center, LANL/G-4896-2012; OI Jacobsohn, Luiz/0000-0001-8991-3903 NR 28 TC 5 Z9 5 U1 0 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD FEB PY 2005 VL 14 IS 2 BP 201 EP 205 DI 10.1016/j.diamond.2004.11.003 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA 899UK UT WOS:000227170600011 ER PT J AU Gautier, DC Muenchausen, RE Jacobsohn, LG Springer, RW Schulze, RK Desia, A AF Gautier, DC Muenchausen, RE Jacobsohn, LG Springer, RW Schulze, RK Desia, A TI Microwave plasma enhanced chemical vapor deposition of diamond in silicon pores SO DIAMOND AND RELATED MATERIALS LA English DT Article DE plasma CVD; polycrystalline diamond films; doped diamond ID SECONDARY-ELECTRON EMISSION; RAMAN-SPECTRUM; CYCLIC PROCESS; CARBON-FILMS; NUCLEATION; GROWTH; UV AB In this work, the feasibility of growing boron-doped diamond coatings, approximately 0.3 mum thick, on thin silicon substrates that have 50-mum diameter pores etched 125 mum deep has been demonstrated using deep reactive ion etching (DRIE) in combination with chemical-mechanical polishing (CMP). Using a microwave plasma enhanced chemical vapor deposition (MPECVD) cyclic growth process consisting of carburization, bias-enhanced nucleation, diamond growth and boron-doped diamond growth, uniform diamond coatings throughout the pores have been obtained, The coatings were characterized by Raman spectroscopy and scanning electron microscopy and the secondary electron emission coefficients were found to increase from 4 to 10 between 200 and 1000 V, in agreement with reported values for thicker polycrystalline-diamond films grown under similar conditions. (C) 2005 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Tanner Labs, Pasadena, CA 91107 USA. RP Muenchausen, RE (reprint author), Los Alamos Natl Lab, MS E546, Los Alamos, NM 87545 USA. EM rossm@lant.gov OI Jacobsohn, Luiz/0000-0001-8991-3903 NR 24 TC 3 Z9 5 U1 0 U2 4 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD FEB PY 2005 VL 14 IS 2 BP 220 EP 225 DI 10.1016/j.diamond.2004.11.040 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA 899UK UT WOS:000227170600014 ER PT J AU Wilcox, BP Newman, BD AF Wilcox, BP Newman, BD TI Ecohydrology of semiarid landscapes SO ECOLOGY LA English DT Editorial Material DE deep drainage; evapotranspiration; landscape ecology; nutrient cycling; rangeland hydrology; recharge; runoff; soil erosion; water budget; water yield; woody plants; xeric shrubs C1 Texas A&M Univ, College Stn, TX 77843 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wilcox, BP (reprint author), Texas A&M Univ, College Stn, TX 77843 USA. NR 0 TC 22 Z9 23 U1 1 U2 19 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1707 H ST NW, STE 400, WASHINGTON, DC 20006-3915 USA SN 0012-9658 J9 ECOLOGY JI Ecology PD FEB PY 2005 VL 86 IS 2 BP 275 EP 276 DI 10.1890/04-0631 PG 2 WC Ecology SC Environmental Sciences & Ecology GA 906IM UT WOS:000227634400001 ER PT J AU Seyfried, MS Schwinning, S Walvoord, MA Pockman, WT Newman, BD Jackson, RB Phillips, EM AF Seyfried, MS Schwinning, S Walvoord, MA Pockman, WT Newman, BD Jackson, RB Phillips, EM TI Ecohydrological control of deep drainage in arid and semiarid regions SO ECOLOGY LA English DT Article DE deep drainage; ecohydrology; groundwater recharge; xeric shrubs ID PLANT FUNCTIONAL TYPE; DESERT VADOSE ZONES; SOIL-WATER; ROOTING DEPTH; MOJAVE DESERT; ARTEMISIA-TRIDENTATA; VEGETATION CHANGE; UNSATURATED FLOW; HYDRAULIC LIFT; SONORAN DESERT AB The amount and spatial distribution of deep drainage (downward movement of water across the bottom of the root zone) and groundwater recharge affect the quantity and quality of increasingly limited groundwater in arid and semiarid regions. We synthesize research from the fields of ecology and hydrology to address the issue of deep drainage in and and semiarid regions. We start with a recently developed hydrological model that accurately simulates soil water potential and geochemical profiles measured in thick (>50 m), unconsolidated vadose zones. Model results indicate that, since the climate change that marked the onset of the Holocene period 10000-15000 years ago, there has been no deep drainage in vegetated interdrainage areas and that continuous, relatively low (<-1 MPa) soil water potentials have been maintained at depths of 2-3 m. A conceptual model consistent with these results proposes that the native, xeric-shrub-dominated, plant communities that gained dominance during the Holocene generated and maintained these conditions. We present three lines of ecological evidence that support the conceptual model. First, xeric shrubs have sufficiently deep rooting systems with low extraction limits to generate the modeled conditions. Second, the characteristic deep-rooted soil-plant systems store sufficient water to effectively buffer deep soil from climatic fluctuations in these dry environments, allowing stable conditions to persist for long periods of time. And third, adaptations resulting in deep, low-extraction-limit rooting systems confer significant advantages to xeric shrubs in and and semiarid environments. We then consider conditions in arid and semiarid regions in which the conceptual model may not apply, leading to the expectation that portions of many arid and semiarid watersheds supply some deep drainage. Further ecohydrologic research is required to elucidate critical climatic and edaphic thresholds, evaluate the role of important physiological processes (Such as hydraulic redistribution), and evaluate the role of deep roots in terms of carbon costs, nutrient uptake, and whole-plant development. C1 USDA, ARS, NW Watershed Res Ctr, Boise, ID 83712 USA. Biosphere 2 Ctr, Oracle, AZ 85623 USA. US Geol Survey, Denver Fed Ctr, Lakewood, CO 80225 USA. Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Duke Univ, Dept Biol, Durham, NC 27708 USA. New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA. RP Seyfried, MS (reprint author), USDA, ARS, NW Watershed Res Ctr, 800 Pk Blvd, Boise, ID 83712 USA. EM mseyfrie@nwrc.ars.usda.gov RI Pockman, William/D-4086-2014; Schwinning, Susanne/G-6412-2015 OI Pockman, William/0000-0002-3286-0457; Schwinning, Susanne/0000-0002-9740-0291 NR 73 TC 98 Z9 103 U1 7 U2 68 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1707 H ST NW, STE 400, WASHINGTON, DC 20006-3915 USA SN 0012-9658 J9 ECOLOGY JI Ecology PD FEB PY 2005 VL 86 IS 2 BP 277 EP 287 DI 10.1890/03-0568 PG 11 WC Ecology SC Environmental Sciences & Ecology GA 906IM UT WOS:000227634400002 ER PT J AU Huxman, TE Wilcox, BP Breshears, DD Scott, RL Snyder, KA Small, EE Hultine, K Pockman, WT Jackson, RB AF Huxman, TE Wilcox, BP Breshears, DD Scott, RL Snyder, KA Small, EE Hultine, K Pockman, WT Jackson, RB TI Ecohydrological implications of woody plant encroachment SO ECOLOGY LA English DT Article DE carbon cycling; ecohydrology; evapotranspiration; vegetation change; woody plant encroachment ID CHIHUAHUAN DESERT; MOJAVE DESERT; WATER YIELD; NEW-MEXICO; GRASSLAND/FOREST CONTINUUM; CATCHMENT EXPERIMENTS; AMERICAN SOUTHWEST; VEGETATION CHANGES; TEXAS RANGELANDS; ROOTING DEPTH AB Increases in the abundance or density of woody plants in historically semiarid and arid grassland ecosystems have important ecological, hydrological, and socioeconomic implications. Using a simplified water-balance model, we propose a framework for conceptualizing how woody plant encroachment is likely to affect components of the water cycle within these ecosystems. We focus in particular on streamflow and the partitioning of evapotranspiration into evaporation and transpiration. On the basis of this framework, we Suggest that streamflow and evaporation processes are affected by woody plant encroachment in different ways, depending on the degree and seasonality of aridity and the availability of subsurface water. Differences in landscape physiography, climate, and runoff mechanisms mediate the influence of woody plants on hydrological processes. Streamflow is expected to decline as a result of woody plant encroachment in landscapes dominated by subsurface flow regimes. Similarly, encroachment of woody plants can be expected to produce an increase in the fractional contribution of bare soil evaporation to evapotranspiration in semiarid ecosystems, Whereas such shifts may be small or negligible in both subhumid and and ecosystems. This framework for considering the effects of woody plant encroachment highlights important ecological and hydrological interactions that serve as a basis for predicting other ecological aspects of vegetation change-such as potential changes in carbon cycling within an ecosystem. In locations where woody plant encroachment results in increased plant transpiration and concurrently the availability of soil water is reduced, increased accumulation of carbon in soils emerges as one prediction. Thus, explicitly considering the ecohydrological linkages associated with vegetation change provides needed information on the consequences of woody plant encroachment on water yield, carbon cycling, and other processes. C1 Univ Arizona, Tucson, AZ 85721 USA. Texas A&M Univ, College Stn, TX 77843 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. USDA, ARS, SW Watershed Res Ctr, Tucson, AZ 85719 USA. USDA, ARS, Jornada Expt Range, Las Cruces, NM 88003 USA. Univ Colorado, Boulder, CO 80309 USA. Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA. Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA. Duke Univ, Dept Biol, Durham, NC 27708 USA. Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC 27708 USA. RP Huxman, TE (reprint author), Univ Arizona, Tucson, AZ 85721 USA. EM huxman@arizona.edu RI small, eric/B-4939-2011; Pockman, William/D-4086-2014; Small, eric/K-6007-2015; Breshears, David/B-9318-2009 OI Pockman, William/0000-0002-3286-0457; Breshears, David/0000-0001-6601-0058 NR 74 TC 325 Z9 341 U1 24 U2 158 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1707 H ST NW, STE 400, WASHINGTON, DC 20006-3915 USA SN 0012-9658 J9 ECOLOGY JI Ecology PD FEB PY 2005 VL 86 IS 2 BP 308 EP 319 DI 10.1890/03-0583 PG 12 WC Ecology SC Environmental Sciences & Ecology GA 906IM UT WOS:000227634400005 ER PT J AU Romme, WH Turner, MG Tuskan, GA Reed, RA AF Romme, WH Turner, MG Tuskan, GA Reed, RA TI Establishment, persistence, and growth of aspen (Populus tremuloides) seedlings in Yellowstone National Park SO ECOLOGY LA English DT Article DE browsing; Cervus elaphus; clonal plants; elk; experimental studies; herbivory; Populus tremuloides; quaking aspen; random amplified polymorphic DNA (RAPD) genetic analyses; Yellowstone ID TREMBLING ASPEN; CLONAL PLANTS; NUTRIENT AVAILABILITY; GENETIC-VARIATION; QUAKING ASPEN; FIRE; ELK; LANDSCAPE; USA; RECRUITMENT AB Quaking aspen (Populas tremuloides Michx.) is a long-lived clonal species in which many genetically identical stems (ramets) arise from a common root system. Establishment by seed is extremely rare in the Rocky Mountain region, where most clones that exist today are thought to have established hundreds or thousands of years ago. However, recruitment of new genetic individuals through sexual reproduction has occurred periodically throughout the Holocene, and widespread establishment of seedling aspen occurred in Yellowstone National Park, USA, following the extensive 1988 fires. We combined extensive survey methods with manipulative experiments to investigate the patterns and mechanisms of new aspen genet establishment, growth, and survival during their first decade of development. Excavation and aging of 171 aspen stems in 1996 demonstrated that 65% had established within the first three years after the 1988 fires, and that none predated 1988. Random amplified polymorphic DNA (RAPD) genetic analyses revealed that 92% of the plants were genetically distinct individuals, and 8% were ramets. Annual surveys of 22 permanently marked aspen seedling plots revealed that 24% of 417 seedlings tallied in 1996 had died by 2000. However, mortality varied greatly among the 22 plots, from < 10% to > 40%, with greater mortality at lower elevations and where soil organic matter was low. To evaluate the mechanisms underlying seedling persistence or mortality, we constructed exclosures in three sites to protect aspen seedlings from ungulate browsing, and applied four experimental treatments from 1996 to 1998: (1) clipping of current year's growth to simulate browsing, (2) removal of potential competitors including lodgepole pine (Pinus contorta var. latifolia) saplings and herbaceous plants, (3) clipping and competitor removal, and (4) control, i.e., no treatment except protection from browsing. Clipping prevented stem elongation, but removing competitors had no significant effect on height growth of aspen seedlings. Even with protection from browsing, most aspen stems grew slowly (mean increment < 25 cm from 1996 to 2000), and many died from causes unrelated to herbivory. Nevertheless, some individuals were > 2 m tall in 2003 and appeared vigorous. The aspen cohort that germinated after the 1988 fires appears to be in the earliest stage of a long-term population process, a process that likely will entail a shift from many genetically distinct individuals but few ramets, to relatively few genets having numerous ramets. We predict that many or most of the post-1988 aspen seedlings will die within the next few decades, with little lasting effect on broad-scale vegetation patterns or postfire successional trajectories. However, some new genets appear likely to survive and to establish new aspen clones, with potentially important consequences for demographic and genetic structure of the Yellowstone aspen population. C1 Colorado State Univ, Dept Forest Rangeland & Watershed Stewardship, Ft Collins, CO 80523 USA. Univ Wisconsin, Dept Zool, Madison, WI 53706 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Univ Wisconsin, Dept Zool, Madison, WI 53706 USA. RP Romme, WH (reprint author), Colorado State Univ, Dept Forest Rangeland & Watershed Stewardship, Ft Collins, CO 80523 USA. EM romme@cnr.colostate.edu RI Tuskan, Gerald/A-6225-2011; Turner, Monica/B-2099-2010; Romme, William/C-7317-2016 OI Tuskan, Gerald/0000-0003-0106-1289; NR 71 TC 55 Z9 58 U1 8 U2 55 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1990 M STREET NW, STE 700, WASHINGTON, DC 20036 USA SN 0012-9658 J9 ECOLOGY JI Ecology PD FEB PY 2005 VL 86 IS 2 BP 404 EP 418 DI 10.1890/03-4093 PG 15 WC Ecology SC Environmental Sciences & Ecology GA 906IM UT WOS:000227634400017 ER PT J AU Yue, M Schlueter, R AF Yue, M Schlueter, R TI Bifurcation subsystem method based classification for power system stability problems SO ELECTRIC POWER COMPONENTS AND SYSTEMS LA English DT Article DE bifurcation subsystem method; Hope bifurcation; saddle-node bifurcation; singularity induced bifurcation ID OUTAGE AB A bifurcation subsystem method based classification of types and classes of bifurcation is presented in this article. The study of the types of stability problems in power systems and the identification of different classes of each type of bifurcation are required in order to prescribe cures for stabilizing a specific bifurcation. With the help of the bifurcation subsystem method, this article is trying to address the following questions which have been raised: (a) what is the relation between network and dynamic bifurcation?; (b) how and why are interarea and local modes produced?; (c) what are the classes and types of bifurcation for different load models?; and (d) how do we find the bifurcation subsystem and the behaviors when singularity induced bifurcation occurs? The bifurcation subsystem method is applied to a two-area example power system and the classification of bifurcations that occur to this example system is studied thoroughly. The complete numerical examples are shown and analyzed to verify the classes of saddle-node, Hopf, and singularity induced bifurcation hypothesized previously. C1 Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA. Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA. RP Yue, M (reprint author), POB 42, Upton, NY 11973 USA. EM yuemeng@bnl.gov NR 11 TC 0 Z9 0 U1 1 U2 3 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 1532-5008 J9 ELECTR POW COMPO SYS JI Electr. Power Compon. Syst. PD FEB PY 2005 VL 33 IS 2 BP 213 EP 231 DI 10.1080/15325000590463115 PG 19 WC Engineering, Electrical & Electronic SC Engineering GA 886TT UT WOS:000226256300007 ER PT J AU Park, KW Toney, MF AF Park, KW Toney, MF TI Electrochemical and electrochromic properties of nanoworm-shaped Ta2O5-Pt thin-films SO ELECTROCHEMISTRY COMMUNICATIONS LA English DT Article DE proton transfer; electrochromism; Ta2O5; Pt nanophases; nanocomposite ID IN-SITU OBSERVATION; FUEL-CELLS; NANOCRYSTALS; NANOWIRES; ELECTRODE; GROWTH; SCATTERING AB A Ta2O5-Pt nanostructure electrode was fabricated by means of cosputtering deposition method. Worm-like Pt nanoparticles were produced in Ta2O5 matrix as observed by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). The electrochemical and electrochromic properties of nanoworm-shaped Ta2O5-Pt electrode are compared with those of Ta2O5 thin-film electrode without Pt nanoparticles. (C) 2004 Elsevier B.V. All rights reserved. C1 Penn State Univ, Dept Chem, University Pk, PA 16802 USA. Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA. RP Park, KW (reprint author), Penn State Univ, Dept Chem, 104 Chem Bldg, University Pk, PA 16802 USA. EM kup12@psu.edu; mftoney@slac.Stanford.edu NR 19 TC 10 Z9 10 U1 0 U2 11 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1388-2481 J9 ELECTROCHEM COMMUN JI Electrochem. Commun. PD FEB PY 2005 VL 7 IS 2 BP 151 EP 155 DI 10.1016/j.elecom.2004.12.001 PG 5 WC Electrochemistry SC Electrochemistry GA 897ST UT WOS:000227026100007 ER PT J AU Lin, YH Cui, XL Li, LY AF Lin, YH Cui, XL Li, LY TI Low-potential amperometric determination of hydrogen peroxide with a carbon paste electrode modified with nanostructured cryptomelane-type manganese oxides SO ELECTROCHEMISTRY COMMUNICATIONS LA English DT Article DE hydrogen peroxide; carbon paste electrode; H2O2 sensor; nanostructured cryptomelane-type manganese oxides ID OCTAHEDRAL MOLECULAR-SIEVES; MNO2 NANOPARTICLES; OXIDATION; OMS-2; NANOTUBES; CATALYSTS; EFFICIENT; SENSOR; METAL AB Nanostructured. cryptomelane-type manganese oxides were synthesized, characterized, and evaluated for chemical sensing. Cryp-tomelane-type manganese oxides are nanofibrous crystals with sub-nanometer open tunnels that provide a unique property for sensing applications. Carbon paste electrodes (CPEs), modified with the nanostructured cryptomelane-type manganese oxides, were investigated for amperometric detection of hydrogen peroxide. With an operating potential of +0.3 V versus Ag/AgCl, H2O2 produces catalytic oxidation currents at the modified CPE, which can be exploited for quantitative determinations. The amperometric signals are linearly proportional to H2O2 concentration in the range 1.0 X 10(-4) -6.9 x 10(-4) M with a correlation coefficient of 0.995 (n = 7). At a signal-to-noise ratio of 3, a detection limit of 2 muM can be observed for the CPE modified with 5.5 wt% cryptomelane-type manganese oxides. In addition, the sensor has a good stability and reproducibility. The construction and renewal are simple and inexpensive. A possible response mechanism was proposed and discussed. The significant electrocatalytic activity of the modified CPE may result from the nanostructure of cryptomelane-type manganese oxides. (C) 2004 Elsevier B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China. RP Lin, YH (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd,POB 999, Richland, WA 99352 USA. EM yuehe.lin@pnl.gov RI Lin, Yuehe/D-9762-2011 OI Lin, Yuehe/0000-0003-3791-7587 NR 24 TC 114 Z9 116 U1 0 U2 29 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1388-2481 J9 ELECTROCHEM COMMUN JI Electrochem. Commun. PD FEB PY 2005 VL 7 IS 2 BP 166 EP 172 DI 10.1016/j.elecom.2004.12.005 PG 7 WC Electrochemistry SC Electrochemistry GA 897ST UT WOS:000227026100010 ER PT J AU Wang, D Federspiel, CC Rubinstein, F AF Wang, D Federspiel, CC Rubinstein, F TI Modeling occupancy in single person offices SO ENERGY AND BUILDINGS LA English DT Article DE commercial buildings; occupancy properties; single person offices; modeling AB This paper examines the statistical properties of occupancy in single person offices of a large office building in San Francisco. A probabilistic model to predict and simulate occupancy in single person offices is proposed. It is found that vacancy intervals are exponentially distributed and that the coefficient of the exponential distribution for a single office could be treated as a constant over the day. Occupancy intervals are more complex than vacancy intervals. The distribution of occupancy intervals is time varying. Variations among different offices are examined. The implications of the findings on thermal and air quality control are discussed. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Ctr Environm Design Res, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Wang, D (reprint author), Univ Calif Berkeley, Ctr Environm Design Res, 390 Wurster Hall,1839, Berkeley, CA 94720 USA. EM wangdn@berkeley.edu NR 7 TC 73 Z9 74 U1 1 U2 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0378-7788 J9 ENERG BUILDINGS JI Energy Build. PD FEB PY 2005 VL 37 IS 2 BP 121 EP 126 DI 10.1016/j.enbuild.2004.06.015 PG 6 WC Construction & Building Technology; Energy & Fuels; Engineering, Civil SC Construction & Building Technology; Energy & Fuels; Engineering GA 873UH UT WOS:000225306100002 ER PT J AU Szklo, AS Schaeffer, R Schuller, ME Chandler, W AF Szklo, AS Schaeffer, R Schuller, ME Chandler, W TI Brazilian energy policies side-effects on CO2 emissions reduction SO ENERGY POLICY LA English DT Article DE Brazil's energy sector; CO2 emissions; energy policies ID COGENERATION; TECHNOLOGY; POWER AB This study focuses on some of the programs and measures Brazil has undertaken over the past two or three decades in order to mitigate economic or environmental problems, which have also had positive effects on the reduction of the country's carbon dioxide emissions. Results show that, in the year 2000 alone, some 11% in CO2 emissions from energy use in Brazil have been reduced compared to what would have been emitted that year had the actions reviewed here not been implemented in good time. As these actions have not been motivated as a strategy to curb global climate change, if their benefits related to avoided carbon emissions are not fully appraised in the near future, chances are that these policies may be discontinued. For instance, in the case of the business-as-usual scenario drawn up by the Ministry of Mines and Energy in 2001, the discontinuity of the policies analyzed here would result in CO2 emissions 20% higher by 2020, compared to what would happen were these policies kept over the long term. Therefore, the perspective presented here spotlights some of the hidden benefits of the programs and measures underway in the country, justifying their continuation or even intensification. (C) 2003 Elsevier Ltd. All rights reserved. C1 Univ Fed Rio de Janeiro, COPPE, Energy Planning Program, BR-21945970 Rio De Janeiro, Brazil. Pacific NW Natl Lab, Battelle Mem Inst, Washington, DC 20024 USA. RP Szklo, AS (reprint author), Univ Fed Rio de Janeiro, COPPE, Energy Planning Program, POB 68565, BR-21945970 Rio De Janeiro, Brazil. EM szklo@ppe.ufrj.br RI SZKLO, ALEXANDRE /C-3315-2013 NR 47 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD FEB PY 2005 VL 33 IS 3 BP 349 EP 364 DI 10.1016/j.enpol.2003.08.005 PG 16 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA 871ZW UT WOS:000225176300007 ER PT J AU Goldman, CA Hopper, NC Osborn, JG AF Goldman, CA Hopper, NC Osborn, JG TI Review of US ESCO industry market trends: an empirical analysis of project data SO ENERGY POLICY LA English DT Article DE energy efficiency; energy service companies (ESCOs); performance contracting ID ENERGY-EFFICIENCY; FAILURES AB This comprehensive empirical analysis of US energy service company (ESCO) industry trends and performance employs two parallel analytical approaches: a survey of firms to estimate total industry size, and a database of 1500 ESCO projects, from which we report target markets and typical project characteristics, energy savings and customer economics. We estimate that industry investment for energy-efficiency related services reached US$2 billion in 2000 following a decade of strong growth. ESCO activity is concentrated in states with high economic activity and strong policy support. Typical projects save 150-200 MJ/m(2)/year and are cost-effective with median benefit/cost ratios of 1.6 and 2.1 for institutional and private sector projects. The median simple payback time (SPT) is 7 years among institutional customers; 3 years is typical in the private sector. Reliance on DSM incentives has decreased since 1995. Preliminary evidence suggests that state enabling policies have boosted the industry in medium-sized states. ESCOs have proven resilient in the face of restructuring and will probably shift toward selling "energy solutions", with energy efficiency part of a package. We conclude that appropriate policy support-both financial and non-financial-can "jump-start" a viable private-sector energy-efficiency services industry that targets large institutional and commercial/industrial customers. (C) 2003 Elsevier Ltd. All rights reserved. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Goldman, CA (reprint author), Lawrence Berkeley Natl Lab, 1 Cyclotron Rd,MS 90-4000, Berkeley, CA 94720 USA. EM cagoldman@lbl.gov NR 22 TC 51 Z9 53 U1 4 U2 21 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD FEB PY 2005 VL 33 IS 3 BP 387 EP 405 DI 10.1016/j.enpol.2003.08.008 PG 19 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA 871ZW UT WOS:000225176300009 ER PT J AU Hopkins, WA Winne, CT DuRant, SE AF Hopkins, WA Winne, CT DuRant, SE TI Differential swimming performance of two natricine snakes exposed to a cholinesterase-inhibiting pesticide SO ENVIRONMENTAL POLLUTION LA English DT Article DE carbaryl; cholinesterase; reptiles; snakes; swimming performance ID BULLFROGS RANA-CATESBEIANA; TROUT ONCORHYNCHUS-MYKISS; RAINBOW-TROUT; AMPHIBIAN COMMUNITIES; METHYL PARATHION; TOXICITY; INSECTICIDE; CARBARYL; BEHAVIOR; NEUROTOXICITY AB Environmental contaminants have direct effects on organisms at the molecular, cellular, and tissue levels, but the net results of these sub-organismal effects are only consequential to exposed populations if they alter organism-level traits that ultimately influence fitness (e.g., growth, locomotor performance, reproduction, and survival). Here, we explore the possibility that the swimming performance of neonate black swamp snakes (Seminatrix pygaea) and diamondback water snakes (Nerodia rhombifer) may be affected by exposure to carbaryl (2.5 and 5.0 mg/L). The highest concentration of carbaryl caused greater reductions in swim velocity in S. pygaea than in N. rhombifer. Most individuals recovered from the effects of carbaryl on swimming performance within 96 h, but recovery was significantly slower in S. pygaea than in N. rhombifer. We hypothesize that the sensitivity of S. pygaea may arise from its highly permeable integument compared to other natricines. Our findings suggest that performance can serve as an ecologically relevant response to contaminant exposure in reptiles and warrants further study. Published by Elsevier Ltd. C1 Univ Georgia, Savannah River Ecol Lab, Wildlife Ecotoxicol & Physiol Ecol Program, Aiken, SC 29802 USA. RP Hopkins, WA (reprint author), Univ Georgia, Savannah River Ecol Lab, Wildlife Ecotoxicol & Physiol Ecol Program, PO Drawer E, Aiken, SC 29802 USA. EM hopkins@srel.edu NR 50 TC 24 Z9 24 U1 1 U2 6 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0269-7491 J9 ENVIRON POLLUT JI Environ. Pollut. PD FEB PY 2005 VL 133 IS 3 BP 531 EP 540 DI 10.1016/j.envpol.2004.06.014 PG 10 WC Environmental Sciences SC Environmental Sciences & Ecology GA 875KZ UT WOS:000225420400014 PM 15519728 ER PT J AU Gu, BH Ku, YK Brown, GM AF Gu, BH Ku, YK Brown, GM TI Sorption and desorption of perchlorate and U(VI) by strong-base anion-exchange resins SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ION-EXCHANGE; CONTAMINATED GROUNDWATER; IMPROVED SELECTIVITY; MICROBIAL REDUCTION; DRINKING-WATER; URANIUM; REMOVAL; CR(VI); PERTECHNETATE; KINETICS AB This study investigated the sorption affinity and capacity of six strong-base anion-exchange (SBA) resins for both uranium [U(VI)] and perchlorate (ClO4-) in simulated groundwater containing varying concentrations of sulfate (SO42-). Additionally, desorption of U(VI) from spent resins was studied to separate U(VI) from resins with sorbed ClO4- for waste segregation and minimization. Results indicate that all SBA resins investigated in this study strongly sorb U(VI). The gel-type polyacrylic resin (Purolite A850) showed the highest sorption affinity and capacity for U(VI) but was the least effective in sorbing ClO4-. The presence of SO42- had little impact on the sorption of U(VI) but significantly affected the sorption of ClO4-, particularly on monofunctional SBA resins. A dilute acid wash was found to be effective in desorbing U(VI) but ineffective in desorbing ClO4- from bifunctional resins (Purolite A530E and WBR109). A single wash removed similar to75% of sorbed U(VI) but only similar to0.1% of sorbed ClO4- from the bifunctional resins. On the other hand, only 21.4% of sorbed U(VI) but similar to34% of sorbed ClO4- was desorbed from the Purolite A850 resin. This study concludes that bifunctional resins could be used effectively to treat water contaminated with ClO4- and traces of U(VI), and dilute acid washes could minimize hazardous wastes by separating sorbed U(VI) from ClO4- prior to the regeneration of the spent resin loaded with ClO4-. C1 Oak Ridge Natl Lab, Environm Sci Div, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37831 USA. RP Gu, BH (reprint author), Oak Ridge Natl Lab, Environm Sci Div, POB 2008,MS-6036, Oak Ridge, TN 37831 USA. EM gub1@ornl.gov RI Gu, Baohua/B-9511-2012 OI Gu, Baohua/0000-0002-7299-2956 NR 28 TC 70 Z9 70 U1 0 U2 32 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD FEB 1 PY 2005 VL 39 IS 3 BP 901 EP 907 DI 10.1021/es049121f PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 893IN UT WOS:000226712600042 PM 15757357 ER PT J AU Plaza, G Ulfig, K Worsztynowicz, A Malina, G Krzeminska, B Brigmon, RL AF Plaza, G Ulfig, K Worsztynowicz, A Malina, G Krzeminska, B Brigmon, RL TI Respirometry for assessing the biodegradation of petroleum hydrocarbons SO ENVIRONMENTAL TECHNOLOGY LA English DT Article DE Micro-Oxymax((R)); petroleum hydrocarbons; bioremediation; biodegradation ID POLYCYCLIC AROMATIC-HYDROCARBONS; CONTAMINATED SOIL; BIOREMEDIATION; CHEMICALS AB The respiration method using the Micro-Oxymax (R) respirometer was applied to evaluate the bioremediation potential of hydrocarbon-contaminated soils in two biopiles at the oil refinery in Czechowice-Dziedzice, Poland. In biopiles 1 and 2, two different technologies, i.e., enhanced (engineered) bioremediation and monitored natural attenuation (MNA) were used, respectively. In biopiles 1 and 2, the bioremediation process lasted 6 years and 8 months, respectively. The biodegradation of petroleum hydrocarbons was evaluated on the basis of CO2 production and O-2 uptake. The CO2 production and O-2 consumption rates during hydrocarbon biodegradation were calculated from the slopes of cumulative curve linear regressions. The results confirmed the hydrocarbon biodegradation process in both biopiles. However, in biopile 2 the process was more effective compared to biopile 1. In biopile 2, the O-2 consumption and CO2 production means were 3.37 and 2.4 milliliters per kilogram of soil (dry weight) per minute, respectively. Whereas, in biopile 1, the O-2 consumption and CO2 production means were 1.52 and 1.07 milliliters per kilogram of soil (dry weight) per minute, respectively. The mean biodegradation rate for biopile 2 was two times higher - 67 mg hydrocarbons kg d.w.(-1)day(-1) compared with biopile 1, where the mean was 30 mg hydrocarbons kg d.w.(-1)day(-1). The results were correlated with petroleum hydrocarbon concentrations and microbial activity measured by dehydrogenase assay. C1 Inst Ecol Ind Area, Dept Environ Microbiol, PL-40844 Katowice, Poland. Czestochowa Tech Univ, Inst Environm Engn, Czestochowa, Poland. Savannah River Natl Lab, Aiken, SC 29808 USA. RP Plaza, G (reprint author), Inst Ecol Ind Area, Dept Environ Microbiol, Kossutha 6, PL-40844 Katowice, Poland. NR 22 TC 15 Z9 15 U1 0 U2 4 PU SELPER LTD, PUBLICATIONS DIV PI LONDON PA 79 RUSTHALL AVENUE, LONDON W4 1BN, ENGLAND SN 0959-3330 J9 ENVIRON TECHNOL JI Environ. Technol. PD FEB PY 2005 VL 26 IS 2 BP 161 EP 169 DI 10.1080/09593332608618569 PG 9 WC Environmental Sciences SC Environmental Sciences & Ecology GA 914WF UT WOS:000228258000006 PM 15791797 ER PT J AU Hopkins, WA Snodgrass, JW Baionno, JA Roe, JH Staub, BP Jackson, BP AF Hopkins, WA Snodgrass, JW Baionno, JA Roe, JH Staub, BP Jackson, BP TI Functional relationships among selenium concentrations in the diet, target tissues, and nondestructive tissue samples of two species of snakes SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE selenium; reptiles; trophic transfer; nondestructive tissues; risk assessment ID CHORIOALLANTOIC MEMBRANES; MERCURY LEVELS; NERODIA-FASCIATA; GREAT EGRETS; ICP-MS; EGGS; FEATHERS; EXPOSURE; ACCUMULATION; BIRDS AB Nondestructive sampling methods, such as removal of feathers for contaminant analysis, are desirable in ecological monitoring programs that seek to minimize the impacts of harvesting organisms. Although many reptiles are declining worldwide, nondestructive sampling techniques seldom have been employed for assessing contaminant exposure in these organisms. In this study, we examined the utility of nondestructive tissue sampling for assessing Se exposure in reptiles. We describe the functional relationships among dietary Se concentrations, target tissue Se concentrations, and Se concentrations in nondestructive tissue samples (blood and tail tissue biopsy) in two species of snakes that had been exposed to Se under very different experimental protocols. Using nonlinear regression, we found strong positive correlations (r(2) > 0.92) in all comparisons among Se concentrations in nondestructive tissues, diet, and target tissues. Moreover, equations describing these relationships can be used to estimate concentrations of Se in diet and target organs, from known concentrations of Se in nondestructive tissue samples. Although the current paucity of toxicity data on reptiles precludes tests of our models, we demonstrate how the equations describing these relationships might be used to make predictions about Se accumulation in target organs for risk assessment. Future studies on reptiles that examine these relationships under different Se exposure conditions, and those that document physiological responses of reptiles to various concentrations of Se, will help to refine our models and test their efficacy for predicting health risk. C1 Univ Georgia, Savannah River Ecol Lab, Wildlife Ecotoxicol & Physiol Ecol Program, Aiken, SC 29802 USA. Towson Univ, Dept Biol, Towson, MD 21252 USA. RP Hopkins, WA (reprint author), Univ Georgia, Savannah River Ecol Lab, Wildlife Ecotoxicol & Physiol Ecol Program, PO Drawer E, Aiken, SC 29802 USA. EM hopkins@srel.edu RI Snodgrass, Joel/C-5288-2016 NR 42 TC 16 Z9 16 U1 2 U2 9 PU SETAC PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3367 USA SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD FEB PY 2005 VL 24 IS 2 BP 344 EP 351 DI 10.1897/03-601.1 PG 8 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 888LM UT WOS:000226375600013 PM 15719994 ER PT J AU Diakonov, D AF Diakonov, Dmitri TI Relativistic mean field approximation to baryons SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB We stress the importance of the spontaneous chiral symmetry breaking for understanding the low-energy structure of baryons. The Mean Field Approximation to baryons is formulated, which solves several outstanding paradoxes of the naive quark models, and which allows to compute parton distributions at low virtuality in a consistent way. We explain why this approach to baryons leads to the prediction of relatively light exotic pentaquark baryons, in contrast to the constituent models which do not take seriously the importance of chiral symmetry breaking. We briefly discuss why, to our mind, it is easier to produce exotic pentaquarks at low than at high energies. C1 [Diakonov, Dmitri] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. [Diakonov, Dmitri] NORDITA, DK-2100 Copenhagen, Denmark. [Diakonov, Dmitri] St Petersburg Nucl Phys Inst, Gatchina 188300, Russia. RP Diakonov, D (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RI Diakonov, Dmitri/F-2450-2012 OI Diakonov, Dmitri/0000-0003-4334-2513 FU US Department of Energy [DE-AC05-84ER40150] FX I thank the organizers of the Elba Workshop on electron-nucleus scattering for hospitality. This work has been supported in part by the US Department of Energy under contract DE-AC05-84ER40150. NR 26 TC 10 Z9 11 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 3 EP 8 DI 10.1140/epjad/s2005-05-001-3 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300001 ER PT J AU de Jager, K AF de Jager, Kees TI Electromagnetic form factors of the nucleon SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB The experimental and theoretical status of elastic electron scattering from the nucleon is reviewed. As a consequence of new experimental facilities and new theoretical insights, this subject is advancing with unprecedented precision. C1 [de Jager, Kees] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP de Jager, K (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. FU DOE [DE-AC05-84ER40150, M175] FX This work was supported by DOE contract DE-AC05-84ER40150 Modification No. M175, under which the Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility. NR 55 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 43 EP 47 DI 10.1140/epjad/s2005-05-007-9 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300007 ER PT J AU Blunden, PG Melnitchouk, W Tjon, JA AF Blunden, P. G. Melnitchouk, W. Tjon, J. A. TI Two-photon exchange in elastic electron-proton scattering SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB Two-photon exchange contributions to unpolarized and polarized elastic electron-proton scattering cross sections are evaluated taking into account nucleon finite size effects using realistic form factors. Contributions from nucleon elastic intermediate states are found to have a strong angular dependence, which partially resolves the discrepancy between Rosenbluth and polarization transfer measurements of the proton electric to magnetic form factor ratio. Two-photon contributions to the longitudinal and transverse polarizations are generally found to be small. A comparison is made of two-photon exchange effects with existing data on the ratio of e(+)p to e(-)p cross sections, which is predicted to be enhanced at backward angles. C1 [Blunden, P. G.] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada. [Melnitchouk, W.; Tjon, J. A.] Jefferson Lab, Newport News, VA 23606 USA. [Tjon, J. A.] Univ Maryland, Dept Phys, College Pk, MD 20742 USA. RP Blunden, PG (reprint author), Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada. FU NSERC (Canada); DOE [DE-FG02-93ER-40762, DE-AC05-84ER-40150] FX This work was supported in part by NSERC (Canada), DOE grant DE-FG02-93ER-40762, and DOE contract DE-AC05-84ER-40150 under which the Southeastern Universities Research Association operates the Thomas Jefferson National Accelerator Facility. NR 22 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 59 EP 63 DI 10.1140/epjad/s2005-05-010-2 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300010 ER PT J AU Saha, A AF Saha, Arun CA Hall A Collaboration TI Detailed study of the few nucleon systems with (e,e'p) reactions SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB In a new and detailed experimental program carried out at Jefferson Laboratory, the few nucleon systems has been studied via electrodisintegration of Deuterium and the Helium nuclei. Interesting new results probing the high momentum structure have been studied via the (e,e'p) reaction using the two high resolution spectrometers in Hall A and various kinematic regions have been investigated. Detailed and precise information on the effective bound state momentum distributions have been measured for the first time up to missing momenta of 1 Gev/c in (3)He, exhibiting significant strength at these high momenta which standard nuclear calculations fail to explain and could be an indication of the onset of non-nucleonic degrees of freedom. The continuum region in (3)He has also been invsetigated in great detail looking for nuclear correlations and quasi-deuteron strength. Response function separations have been carried out to extract details of the few body structure and relativistic dynamics. Measurements made so far on D and (4)He have focussed on specific kinematic regions and there are plans to extend them over kinematic ranges similar to the (3)He investigation. C1 [Saha, Arun; Hall A Collaboration] Jefferson Lab, Newport News, VA 23606 USA. RP Saha, A (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. FU DOE [DE-AC05-84ER40150] FX The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility under DOE Contract No. DE-AC05-84ER40150. NR 8 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 81 EP 83 DI 10.1140/epjad/s2005-05-014-x PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300014 ER PT J AU Marcucci, LE Viviani, M Schiavilla, R Kievsky, A Rosati, S AF Marcucci, L. E. Viviani, M. Schiavilla, R. Kievsky, A. Rosati, S. TI Electrodisintegration of (3)He below and above deuteron breakup threshold SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB Recent advances in the study of electrodisintegration of (3)He are here presented and discussed. The pair-correlated hyperspherical harmonics method is used to calculate the initial and final state wave functions, with a realistic Hamiltonian consisting of the Argonne v(18) two-nucleon and Urbana IX three-nucleon interactions. The model for the nuclear current and charge operators retains one-and many-body contributions. Particular attention is made in the construction of the two-body current operators arising from the momentum-dependent part of the two-nucleon interaction. Three-body current operators are also included so that the full current operator is strictly conserved. The present model for the nuclear current operator is tested comparing theoretical predictions and experimental data of pd radiative capture cross section and spin observables. C1 [Marcucci, L. E.; Viviani, M.; Kievsky, A.; Rosati, S.] Univ Pisa, Dept Phys, I-56100 Pisa, Italy. [Marcucci, L. E.; Viviani, M.; Kievsky, A.; Rosati, S.] INFN, Sez Pisa, I-56100 Pisa, Italy. [Schiavilla, R.] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. [Schiavilla, R.] Jefferson Lab, Newport News, VA 23606 USA. RP Marcucci, LE (reprint author), Univ Pisa, Dept Phys, I-56100 Pisa, Italy. FU U.S. DOE [DE-AC05-84ER40150] FX The work of R.S. was supported by the U.S. DOE Contract No. DE-AC05-84ER40150, under which the Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelarator Facility. NR 28 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 95 EP 99 DI 10.1140/epjad/s2005-05-017-7 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300017 ER PT J AU Carlson, J Paris, M AF Carlson, J. Paris, M. TI Parity violation in few-nucleon systems SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB We summarize recent results on parity-violation in few-nucleon systems, including pp elastic scattering and np radiative capture. These results are relevant to recent or present experimental measurements at TRIUMF and LANSCE, respectively. We also present results for other potential or planned experiments, summarizing the contributions they will make to understanding the weak parity-violating NN interaction. Dependencies upon the NN strong interaction are also addressed. C1 [Carlson, J.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. [Paris, M.] Jefferson Lab, Div Theory, Newport News, VA USA. RP Carlson, J (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 123 EP 125 DI 10.1140/epjad/s2005-05-022-x PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300022 ER PT J AU Brodsky, SJ AF Brodsky, Stanley J. TI Novel aspects of QCD in leptoproduction SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB I review several topics in electroproduction which test fundamental aspects of QCD. These include the role of final-state interactions in producing diffractive leptoproduction processes, the shadowing of nuclear structure functions, and target-spin asymmetries. The antishadowing of nuclear structure functions is shown to be quark-flavor specific, suggesting that some part of the anomalous NuTeV result for sin(2) theta(W) could be due to the non-universality of nuclear antishadowing for charged and neutral currents. I also discuss the physics of the heavy-quark sea, hidden color in nuclear wavefunctions, and evidence for color transparency for nuclear processes. The AdS/CFT correspondence connecting superstring theory to superconformal gauge theory has important implications for hadron phenomenology in the conformal limit, including an all-orders demonstration of counting rules for hard exclusive processes, as well as determining essential aspects of hadronic light-front wavefunctions. C1 [Brodsky, Stanley J.] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Brodsky, SJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. FU Department of Energy [DE-AC02-76SF00515] FX It is a pleasure to thank Omar Benhar, Adelchi Fabrocini, and Rocco Schiavilla, the organizers of the Electron-Nucleus Scattering VIII meeting for their hospitality in Elba. I also thank my collaborators, particularly Carl Carlson, Guy de Teramond, Rikard Enberg, Paul Hoyer, Dae Sung Hwang, Gunnar Ingelman, Volodya Karmanov, Joerg Raufeisen, and Ivan Schmidt. This work was supported by the Department of Energy, contract No. DE-AC02-76SF00515. NR 90 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 129 EP 135 DI 10.1140/epjad/s2005-05-023-9 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300023 ER PT J AU Paris, MW Pandharipande, VR Sick, I AF Paris, M. W. Pandharipande, V. R. Sick, I. TI Spin asymmetries for confined Dirac particles SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article ID DEEP-INELASTIC SCATTERING; PARTON DISTRIBUTIONS; NUCLEON; MODEL AB We study the Bjorken x (or equivalently Nachtmann xi) dependence of the virtual photon spin asymmetry in polarized deep inelastic scattering of electrons from hadrons. We use an exactly solved relativistic potential model of the hadron, treating the constituents as independent massless Dirac particles confined to an infinitely massive force center. The importance of including the p-wave components of the Dirac wave function is demonstrated. Comparisons are made to the observed data on the proton by taking into account the observed flavor dependence of the valence quark distribution functions. C1 [Paris, M. W.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. [Pandharipande, V. R.] Univ Illinois, Dept Phys, Urbana, IL 61801 USA. [Sick, I.] Univ Basel, Dept Phys & Astron, CH-4003 Basel, Switzerland. RP Paris, MW (reprint author), Thomas Jefferson Natl Accelerator Facil, MS12H2,12000 Jefferson Ave, Newport News, VA 23606 USA. FU US National Science Foundation [PHY-00-98353]; US Department of Energy [W-7405-ENG-36]; Schweizerische Nationalfonds FX This work has been supported by the US National Science Foundation via grant PHY-00-98353, and by the US Department of Energy under contract W-7405-ENG-36 and the Schweizerische Nationalfonds. NR 18 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 143 EP 147 DI 10.1140/epjad/s2005-05-025-7 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300025 ER PT J AU Vanderhaeghen, M AF Vanderhaeghen, Marc TI Deeply exclusive processes and generalized parton distributions SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article AB We discuss how generalized parton distributions (GPDs) enter into hard exclusive processes, and focuss on the links between GPDs and elastic nucleon form factors. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for the GPDs at small momentum transfer -t is extended to the large-t region and it is found to catch the basic features of proton and neutron electromagnetic form factor data. This parametrization allows to estimate the quark contribution to the nucleon spin. It is furthermore discussed how these GPDs at large-t enter into two-photon exchange processes and resolve the discrepancy between Rosenbluth and polarization experiments of elastic electron nucleon scattering. C1 [Vanderhaeghen, Marc] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. [Vanderhaeghen, Marc] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA. RP Vanderhaeghen, M (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. FU U.S. DOE [DE-AC05-84ER40150, DE-FG02-04ER41302] FX This work is supported by the U.S. DOE under contracts DE-AC05-84ER40150 and DE-FG02-04ER41302. NR 17 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD FEB PY 2005 VL 24 SU 1 BP 149 EP 152 DI 10.1140/epjad/s2005-05-026-6 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA V19NO UT WOS:000208079300026 ER PT J AU Azuelos, G Benslama, K Costanzo, D Couture, G Garcia, JE Hinchliffe, I Kanaya, N Lechowski, M Mehdiyev, R Polesello, G Ros, E Rousseau, D AF Azuelos, G. Benslama, K. Costanzo, D. Couture, G. Garcia, J. E. Hinchliffe, I. Kanaya, N. Lechowski, M. Mehdiyev, R. Polesello, G. Ros, E. Rousseau, D. TI Exploring Little Higgs models with ATLAS at the LHC SO EUROPEAN PHYSICAL JOURNAL C LA English DT Article AB We discuss possible searches for the new particles predicted by Little Higgs Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate how the predicted quark, gauge bosons and additional Higgs bosons can be found and estimate the mass range over which their properties can be constrained. C1 [Azuelos, G.; Benslama, K.; Couture, G.; Mehdiyev, R.] U Montreal, Montreal, PQ, Canada. [Costanzo, D.; Hinchliffe, I.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. [Garcia, J. E.; Ros, E.] Univ Valencia, CSIC, IFIC, E-46003 Valencia, Spain. [Kanaya, N.] Univ Victoria, Victoria, BC, Canada. [Lechowski, M.; Rousseau, D.] Univ Paris 11, CNRS, IN2P3, F-91405 Orsay, France. [Mehdiyev, R.] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan. [Polesello, G.] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy. RP Azuelos, G (reprint author), U Montreal, Montreal, PQ, Canada. RI Garcia, Jose /H-6339-2015 FU Office of Energy Research, Office of High Energy Physics of the U.S. Department of Energy [DE-AC03-76SF00098] FX This work was supported in part by the Director, Office of Energy Research, Office of High Energy Physics of the U.S. Department of Energy under Contract DE-AC03-76SF00098. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. NR 23 TC 82 Z9 82 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6044 J9 EUR PHYS J C JI Eur. Phys. J. C PD FEB PY 2005 VL 39 SU 2 BP 13 EP 24 DI 10.1140/epjcd/s2004-02-002-x PG 12 WC Physics, Particles & Fields SC Physics GA V11XC UT WOS:000207563300002 ER PT J AU Assamagan, KA Gollub, N AF Assamagan, Ketevi A. Gollub, Nils TI The ATLAS discovery potential for a heavy charged Higgs boson in gg -> tbH(+/-) with H(+/-) -> tb SO EUROPEAN PHYSICAL JOURNAL C LA English DT Article DE charged Higgs; MSSM AB The feasibility of detecting a heavy charged Higgs boson, m(H +/-) > m(t) + m(b), decaying in the H(+/-) -> tb channel is studied with the fast simulation of the atlas detector. We study the gg -> H(+/-)tb production process at the LHC which together with the aforementioned decay channel leads to four b-quarks in the final state. The whole production and decay chain reads gg -> tbH(+/-) -> t (t) over barb (b) over bar -> b (b) over barb (t) over bar lv (q) over barq. Combinatorial background is a major difficulty in this multi-jet environment but can be overcome by employing multivariate techniques in the event reconstruction. Requiring four b-tagged jets in the event helps to effectively suppress the Standard Model backgrounds but leads to no significant improvement in the discovery potential compared to analyses requiring only three b-tagged jets. This study indicates that charged Higgs bosons can be discovered at the LHC up to high masses (m(H+) > 400 GeV) in the case of large tan beta. C1 [Assamagan, Ketevi A.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. [Gollub, Nils] Uppsala Univ, Dept Radiat Sci, S-75121 Uppsala, Sweden. RP Assamagan, KA (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM ketevi@bnl.gov; nils.gollub@tsl.uu.se FU development team FX This work has been performed within the atlas Collaboration, and we thank collaboration members for helpful discussions. We have made use of the physics analysis framework and tools which are the result of collaboration-wide efforts. Further we would like to thank Stefano Moretti, Johan Rathsman and Gunnar Ingelman for helpful advice and discussions. Parts of the MC samples were produced on the Nordugrid [21] and we thank the development team for their support. NR 21 TC 19 Z9 19 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6044 J9 EUR PHYS J C JI Eur. Phys. J. C PD FEB PY 2005 VL 39 SU 2 BP 25 EP 40 DI 10.1140/epjcd/s2004-01-009-7 PG 16 WC Physics, Particles & Fields SC Physics GA V11XC UT WOS:000207563300003 ER PT J AU Abdullin, S Banerjee, S Bellucci, L Charlot, C Denegri, D Dittmar, M Drollinger, V Dubinin, MN Dzelalija, M Green, D Iasvili, I Ilyin, VA Kinnunen, R Kunori, S Lassila-Perini, K Lehti, S Mazumdar, K Moortgat, F Muller, T Nikitenko, A Puljak, I Salmi, P Seez, C Slabospitsky, S Stepanov, N Vidal, R Wu, W Yildiz, HD Zeyrek, M AF Abdullin, S. Banerjee, S. Bellucci, L. Charlot, C. Denegri, D. Dittmar, M. Drollinger, V. Dubinin, M. N. Dzelalija, M. Green, D. Iasvili, I. Ilyin, V. A. Kinnunen, R. Kunori, S. Lassila-Perini, K. Lehti, S. Mazumdar, K. Moortgat, F. Muller, Th. Nikitenko, A. Puljak, I. Salmi, P. Seez, C. Slabospitsky, S. Stepanov, N. Vidal, R. Wu, W. Yildiz, H. D. Zeyrek, M. TI Summary of the CMS potential for the Higgs boson discovery SO EUROPEAN PHYSICAL JOURNAL C LA English DT Article AB This work summarizes the studies for the Higgs boson searches in CMS at the LHC collider. The main discovery channels are presented and the potential is given for the discovery of the SM Higgs boson and the Higgs bosons of the MSSM. The phenomenology, detector, trigger and reconstruction issues are briefly discussed. C1 [Abdullin, S.; Kunori, S.] Univ Maryland, College Pk, MD 20742 USA. [Banerjee, S.; Mazumdar, K.] Tata Inst Fundamental Res, Mumbai 400005, Maharashtra, India. [Bellucci, L.] Univ Florence, Florence, Italy. [Bellucci, L.] Sezione Ist Nazl Fis Nucl, Florence, Italy. [Charlot, C.] Ecole Polytech, CNRS, IN2P3, F-91128 Palaiseau, France. [Denegri, D.; Stepanov, N.] CERN, European Lab Nucl Res, CH-1211 Geneva 23, Switzerland. [Dittmar, M.] ETH, Zurich, Switzerland. [Drollinger, V.] Univ Padua, Dept Phys, Padua, Italy. [Dubinin, M. N.; Ilyin, V. A.] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia. [Dzelalija, M.; Puljak, I.] Univ Split, Split, Croatia. [Green, D.; Iasvili, I.; Vidal, R.; Wu, W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Kinnunen, R.; Lassila-Perini, K.; Lehti, S.; Salmi, P.] Helsinki Inst Phys, Helsinki, Finland. [Moortgat, F.] Univ Antwerp, Dept Phys, B-2020 Antwerp, Belgium. [Muller, Th.] Univ Karlsruhe, IEKP, Karlsruhe, Germany. [Nikitenko, A.; Seez, C.] Univ London Imperial Coll Sci Technol & Med, London, England. [Slabospitsky, S.] IHEP, Protvino, Moscow Region, Russia. [Yildiz, H. D.; Zeyrek, M.] Middle E Tech Univ, TR-06531 Ankara, Turkey. RP Abdullin, S (reprint author), Univ Maryland, College Pk, MD 20742 USA. FU European Community [HPRN-CT-2002-00326] FX The authors would like to thank A. Djouadi, S. Moretti, T. Plehn, D. Rainwater, D. P. Roy, M. Spira and D. Zeppenfeld for helpful discussions. One of us (V. D.) would like to thank the European Community for financial support (fellowship HPRN-CT-2002-00326). The authors are grateful to all members of the CMS PRS Editorial Board, P. Janot, I. Van Vulpen, N. Marinelli, N. Neumeister, D. Denegri and V. Hagopian. NR 89 TC 42 Z9 42 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6044 J9 EUR PHYS J C JI Eur. Phys. J. C PD FEB PY 2005 VL 39 SU 2 BP 41 EP 61 DI 10.1140/epjcd/s2004-02-003-9 PG 21 WC Physics, Particles & Fields SC Physics GA V11XC UT WOS:000207563300004 ER PT J AU Berger, CF Schweiger, W AF Berger, CF Schweiger, W TI Exclusive decuplet-baryon pair production in two-photon collisions SO EUROPEAN PHYSICAL JOURNAL C LA English DT Article ID LARGE MOMENTUM-TRANSFER; ROOT-S(EE)=183-189 GEV; PROTON-ANTIPROTON; WAVE-FUNCTIONS; CROSS-SECTION; QCD; LEP; ANNIHILATION; ANTIBARYON; SCHEME AB This work extends our previous studies of two-photon annihilation into baryon-antibaryon pairs from spin-1/2 octet to spin-3/2 decuplet baryons. Our approach is based on perturbative QCD and treats baryons as quark-diquark systems. Using the same model parameters as in our previous work, supplemented by QCD sum-rule results for decuplet baryon wave functions, we are able to give absolute predictions for decuplet baryon cross sections without introducing new parameters. We find that the Delta(++) cross section is of the same order of magnitude as the proton cross section, well within experimental bounds. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Graz Univ, Inst Phys, A-8010 Graz, Austria. RP Berger, CF (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM cfberger@slac.stanford.edu; wolfgang.schweiger@uni-graz.at NR 40 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6044 EI 1434-6052 J9 EUR PHYS J C JI Eur. Phys. J. C PD FEB PY 2005 VL 39 IS 2 BP 173 EP 178 DI 10.1140/epjc/s2004-02092-y PG 6 WC Physics, Particles & Fields SC Physics GA 892CZ UT WOS:000226628700004 ER PT J AU Gianotti, F Mangano, ML Virdee, T Abdullin, S Azuelos, G Ball, A Barberis, D Belyaev, A Bloch, P Bosman, M Casagrande, L Cavalli, D Chumney, P Cittolin, S Dasu, S De Roeck, A Ellis, N Farthouat, P Fournier, D Hansen, JB Hinchliffe, I Hohlfeld, M Huhtinen, M Jakobs, K Joram, C Mazzucato, F Mikenberg, G Miagkov, A Moretti, M Moretti, S Niinikoski, T Nikitenko, A Nisati, A Paige, F Palestini, S Papadopoulos, CG Piccinini, F Pittau, R Polesello, G Richter-Was, E Sharp, P Slabospitsky, SR Smith, WH Stapnes, S Tonelli, G Tsesmelis, E Usubov, Z Vacavant, L van der Bij, J Watson, A Wielers, M AF Gianotti, F Mangano, ML Virdee, T Abdullin, S Azuelos, G Ball, A Barberis, D Belyaev, A Bloch, P Bosman, M Casagrande, L Cavalli, D Chumney, P Cittolin, S Dasu, S De Roeck, A Ellis, N Farthouat, P Fournier, D Hansen, JB Hinchliffe, I Hohlfeld, M Huhtinen, M Jakobs, K Joram, C Mazzucato, F Mikenberg, G Miagkov, A Moretti, M Moretti, S Niinikoski, T Nikitenko, A Nisati, A Paige, F Palestini, S Papadopoulos, CG Piccinini, F Pittau, R Polesello, G Richter-Was, E Sharp, P Slabospitsky, SR Smith, WH Stapnes, S Tonelli, G Tsesmelis, E Usubov, Z Vacavant, L van der Bij, J Watson, A Wielers, M TI Physics potential and experimental challenges of the LHC luminosity upgrade SO EUROPEAN PHYSICAL JOURNAL C LA English DT Review ID BOSON PAIR PRODUCTION; ALPHA-S CALCULATION; INTERACTING WW SYSTEM; DEEP-SUBMICRON CMOS; GOLD-PLATED MODES; HADRONIC COLLISIONS; EXTRA DIMENSIONS; MAGNETIC-MOMENT; EVENT GENERATOR; SELF-COUPLINGS AB We discuss the physics potential and the experimental challenges of an upgraded LHC running at an instantaneous luminosity of 10(35) cm(-2) s(-1). The detector R&D needed to operate ATLAS and CMS in a very high radiation environment and the expected detector performance are discussed. A few examples of the increased physics potential are given, ranging from precise measurements within the Standard Model (in particular in the Higgs sector) to the discovery reach for several New Physics processes. C1 CERN, Expt Phys Div, Geneva, Switzerland. CERN, Div Theoret Phys, CH-1211 Geneva, Switzerland. Univ London Imperial Coll Sci Technol & Med, London, England. Univ Maryland, College Pk, MD 20742 USA. Univ Montreal, Grp Particle Phys, Montreal, PQ, Canada. Univ Genoa, Dipartimento Fis, Genoa, Italy. Univ Genoa, Ist Nazl Fis Nucl, Genoa, Italy. Florida State Univ, Tallahassee, FL 32306 USA. IFAE, Barcelona, Spain. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Wisconsin, Madison, WI USA. LAL, Orsay, France. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Mainz, Inst Phys, D-6500 Mainz, Germany. Univ Geneva, Sect Phys, CH-1211 Geneva 4, Switzerland. Weizmann Inst Sci, IL-76100 Rehovot, Israel. Inst High Energy Phys, Protvino, Russia. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Univ Ferrara, Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3HP, England. Univ Roma 1, Dipartimento Fis, Rome, Italy. Univ Roma 1, Ist Nazl Fis Nucl, Rome, Italy. Brookhaven Natl Lab, Upton, NY 11973 USA. NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece. Univ Turin, Dipartimento Fis Teor, I-10124 Turin, Italy. Univ Turin, Ist Nazl Fis Nucl, I-10124 Turin, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Jagiellonian Univ, Inst Comp Sci, Krakow, Poland. Inst Nucl Phys, Krakow, Poland. Univ Oslo, N-0316 Oslo, Norway. Univ Pisa, I-56100 Pisa, Italy. Ist Nazl Fis Nucl, Pisa, Italy. Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan. Joint Inst Nucl Res, Dubna, Russia. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England. TRIUMF, Vancouver, BC V6T 2A3, Canada. RP Gianotti, F (reprint author), CERN, Expt Phys Div, Geneva, Switzerland. RI Bosman, Martine/J-9917-2014; Belyaev, Alexander/F-6637-2015; Pittau, Roberto/E-7953-2016; OI Bosman, Martine/0000-0002-7290-643X; Belyaev, Alexander/0000-0002-1733-4408; Pittau, Roberto/0000-0003-1365-2959; MORETTI, Mauro/0000-0001-5778-1803 NR 101 TC 191 Z9 190 U1 1 U2 11 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 1434-6044 J9 EUR PHYS J C JI Eur. Phys. J. C PD FEB PY 2005 VL 39 IS 3 BP 293 EP 333 DI 10.1140/epjc/s2004-02061-6 PG 41 WC Physics, Particles & Fields SC Physics GA 894SP UT WOS:000226812200002 ER PT J AU Beloborodov, IS Lopatin, AV Hekking, FWJ Fazio, R Vinokur, VM AF Beloborodov, IS Lopatin, AV Hekking, FWJ Fazio, R Vinokur, VM TI Thermal transport in granular metals SO EUROPHYSICS LETTERS LA English DT Article ID CONDUCTIVITY; SYSTEMS AB We study the electron thermal transport in granular metals at large tunnel conductance between the grains, 9(T) much greater than 1, and not too low a temperature, T > 9(T)delta, where delta is the mean energy level spacing for a single grain. Taking into account the electron-electron interaction effects, we calculate the thermal conductivity and show that the Wiedemann-Franz law is violated for granular metals. We find that interaction effects suppress the thermal conductivity less than the electrical conductivity. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. CNRS, Lab Phys & Modelisat Milieux Condenses, F-38042 Grenoble 9, France. Univ Grenoble 1, F-38042 Grenoble 9, France. NEST, INFM, I-56126 Pisa, Italy. Scuola Normale Super Pisa, I-56126 Pisa, Italy. RP Beloborodov, IS (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Fazio, rosario/M-1742-2013 OI Fazio, rosario/0000-0002-7793-179X NR 18 TC 16 Z9 16 U1 1 U2 2 PU E D P SCIENCES PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD FEB PY 2005 VL 69 IS 3 BP 435 EP 441 DI 10.1209/epl/i2004-10355-6 PG 7 WC Physics, Multidisciplinary SC Physics GA 898IJ UT WOS:000227070200020 ER PT J AU Zhou, C Berciu, M AF Zhou, C Berciu, M TI Resistance fluctuations near integer quantum Hall transitions in mesoscopic samples SO EUROPHYSICS LETTERS LA English DT Article ID CONDUCTANCE AB We perform first-principles simulations to study the resistance fluctuations of mesoscopic samples, near transitions between quantum Hall plateaus. We use six-terminal geometry and sample sizes similar to those of real devices and calculate the Hall and longitudinal resistances using the Landauer formula. Our simulations recapture all the observed experimental features. We then use a generalization of the Landauer-Buttiker model, based oft the interplay between tunneling and chiral currents, to explain the three regimes with distinct fluctuations observed, and identify the central regime as the critical region. C1 Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA. Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada. RP Zhou, C (reprint author), Oak Ridge Natl Lab, POB 2008,MS 6164, Oak Ridge, TN 37831 USA. RI Berciu, Mona/O-4889-2014 NR 19 TC 3 Z9 3 U1 0 U2 0 PU E D P SCIENCES PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD FEB PY 2005 VL 69 IS 4 BP 602 EP 608 DI 10.1209/epl/i2004-10398-7 PG 7 WC Physics, Multidisciplinary SC Physics GA 900LS UT WOS:000227217000018 ER PT J AU Fornasiero, F Krull, F Radke, CJ Prausnitz, JM AF Fornasiero, F Krull, F Radke, CJ Prausnitz, JM TI Diffusivity of water through a HEMA-based soft contact lens SO FLUID PHASE EQUILIBRIA LA English DT Article; Proceedings Paper CT 10th International Conference on Propertiies and Phase Equilibria for Product and Process Design CY MAY 16-21, 2004 CL Snowbird, UT DE evaporation-cell method; water diffusion coefficient; HEMA soft contact lens; extended Maxwell-Stefan model ID POLY(2-HYDROXYETHYL METHACRYLATE); STATISTICAL-MECHANICS; T-2 RELAXATION; TRANSPORT; HYDROGELS; MOBILITY; MODEL; VAPOR; DEHYDRATION; MEMBRANES AB Using an evaporation-cell method, molecular diffusion data were obtained for water through a thin membrane of HEMA (2-hydroxyethyl methacrylate) that is a soft contact lens material. Water evaporates from the bottom surface of the membrane that supports a small water reservoir on the top surface. The so-induced chemical potential gradient causes a water flux across the membrane. Measured steady-state water fluxes are interpreted with an extended Maxwell-Stefan model for mixtures whose molecules differ appreciably in size. Flory-Rehner theory accounts for thermodynamic non-ideality of the hydrogel membrane/water mixture. Measured diffusivities are a strong increasing function of water concentration in the membrane. (c) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP Prausnitz, JM (reprint author), BASF, Dept GCTC, Carl Bosch Str 38, D-67056 Ludwigshafen, Germany. EM prausnit@cchem.berkeley.edu RI Fornasiero, Francesco/I-3802-2012 NR 36 TC 12 Z9 12 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD FEB PY 2005 VL 228 SI SI BP 269 EP 273 DI 10.1016/j.fluid.2004.08.020 PG 5 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA 932WJ UT WOS:000229584900032 ER PT J AU Turner, DJ Cherry, RS Sloan, ED AF Turner, DJ Cherry, RS Sloan, ED TI Sensitivity of methane hydrate phase equilibria to sediment pore size SO FLUID PHASE EQUILIBRIA LA English DT Article; Proceedings Paper CT 10th International Conference on Properties and Phase Equilibria for Product and Process Design CY MAY 16-21, 2004 CL Snowbird, UT DE methane hydrate; sediment; Adriatic sandstone; equilibria shift; porous media; surface energy ID POROUS-MEDIA; CARBON-DIOXIDE; SILICA-GELS; DISTRIBUTIONS; TEMPERATURES; PRESSURES AB Hydrate equilibria experiments were conducted in Adriatic sandstone of average pore radius 550 A. The hydrate equilibria in these experiments were indistinguishable from bulk hydrate equilibria data. A sensitivity calculation of methane hydrate equilibrium shifts in porous media was conducted using the Kelvin-Clapeyron equation. The calculation indicates that no shift is discernible from equilibria in pores larger than about 600 A with thermocouple error of +/- 0.5 K. The interfacial energy used in the sensitivity calculations is that between water and hydrate. Nucleation phenomena can be applied to explain the appropriateness of this interfacial energy with the Kelvin-Clapeyron equation. (c) 2004 Elsevier B.V. All rights reserved. C1 Colorado Sch Mines, Ctr Hydrate Res, Golden, CO 80401 USA. Idaho Natl Lab, Idaho Falls, ID 83415 USA. RP Sloan, ED (reprint author), Colorado Sch Mines, Ctr Hydrate Res, 1500 Illinois St, Golden, CO 80401 USA. EM djturner@mines.edu; chy@inel.gov; esloan@mines.edu NR 23 TC 34 Z9 40 U1 3 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 EI 1879-0224 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD FEB PY 2005 VL 228 SI SI BP 505 EP 510 DI 10.1016/j.fluid.2004.09.025 PG 6 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA 932WJ UT WOS:000229584900061 ER PT J AU Gillies, GT Allison, SW AF Gillies, GT Allison, SW TI Experimental test of a time-temperature formulation of the uncertainty principle via nanoparticle fluorescence SO FOUNDATIONS OF PHYSICS LETTERS LA English DT Article DE uncertainty principle; thermal quantum limit; nanoparticle fluorescence ID QUANTUM-MECHANICAL DESCRIPTION; RELATIVE-PHASE INTERACTIONS; THERMAL-EQUILIBRIUM; THERMOGRAPHIC PHOSPHORS; PRECISION-MEASUREMENTS; STATES; INSTRUMENTATION; THERMOMETRY AB The uncertainty in the measured fluorescence decay lifetimes of 30 nm particles of YAG:Ce was used to evaluate the predictions of a novel form of the Heisenberg uncertainty principle suggested by de Sabbata and Sivaram, DeltaTDeltat greater than or equal to (h) over bar /k. The worst-case uncertainty in temperature of approximate to 4.5 degreesK (as derived from the relationship between temperature and lifetime) and the measured uncertainty in decay lifetime, approximate to 0.45 ns, yielded an "internal" estimate of DeltaTDeltat = 2.0 x 10(-9) degreesK s, which is approximate to 263 times larger than (h) over bar /k = 7.6 x 10(-12) degreesK s. An "external" estimate of DeltaTDeltat = 4.5 x 10(11) degreesK s (which is = 6 times (h) over bar /k) is derived from the independently measured uncertainty in the temperature of the sample and the experimentally determined uncertainty in lifetime. These results could be low by a factor of 5.6 if signal averaging must be taken into account. If valid, the findings are consistent with the predictions of this version of the uncertainty principle and they imply the existence of a type of "thermal quantum limit." C1 Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA. Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN 37932 USA. RP Gillies, GT (reprint author), Univ Virginia, Dept Mech & Aerosp Engn, POB 400746, Charlottesville, VA 22904 USA. EM gtg@virginia.edu; allisonsw@ornl.gov NR 25 TC 0 Z9 0 U1 0 U2 2 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0894-9875 J9 FOUND PHYS LETT JI Found. Phys. Lett. PD FEB PY 2005 VL 18 IS 1 BP 65 EP 74 DI 10.1007/s10702-005-2470-z PG 10 WC Physics, Multidisciplinary SC Physics GA 900LQ UT WOS:000227216800005 ER PT J AU Uckan, NA AF Uckan, NA TI Untitled - Comments SO FUSION SCIENCE AND TECHNOLOGY LA English DT Editorial Material C1 Oak Ridge Natl Lab, Div Fus Energy, Oak Ridge, TN 37831 USA. RP Uckan, NA (reprint author), Oak Ridge Natl Lab, Div Fus Energy, Res Off Bldg,ROB-5700,R-F323,MS-6169, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60526 USA SN 1536-1055 J9 FUSION SCI TECHNOL JI Fusion Sci. Technol. PD FEB PY 2005 VL 47 IS 2 BP III EP III PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 895PT UT WOS:000226876100001 ER PT J AU Finken, KH Reiter, D Denner, T Dippel, KH Hobirk, J Mank, G Kever, H Wolf, GH Noda, N Miyahara, A Shoji, T Sato, KN Akaishi, K Boedo, JA Brooks, JN Conn, RW Corbett, WJ Doerner, RP Goebel, D Gray, DS Hillis, DL Hogan, J McGrath, RT Matsunaga, M Moyer, R Nygren, RE Watkins, J AF Finken, KH Reiter, D Denner, T Dippel, KH Hobirk, J Mank, G Kever, H Wolf, GH Noda, N Miyahara, A Shoji, T Sato, KN Akaishi, K Boedo, JA Brooks, JN Conn, RW Corbett, WJ Doerner, RP Goebel, D Gray, DS Hillis, DL Hogan, J McGrath, RT Matsunaga, M Moyer, R Nygren, RE Watkins, J TI The toroidal pump limiter ALT-II in TEXTOR SO FUSION SCIENCE AND TECHNOLOGY LA English DT Article DE pump limiter; particle exhaust; power exhaust ID THERMAL LOAD DISTRIBUTION; ION-CYCLOTRON RANGE; HELIUM EXHAUST; CONFINEMENT DISCHARGES; DEUTERIUM ENVIRONMENT; PARTICLE CONFINEMENT; PELLET INJECTION; TOKAMAK PLASMAS; VELOCITY SHEAR; HIGH-DENSITY AB The Advanced Limiter Test (ALT) project is the focus of a fruitful and intense International Energy Agreement collaboration on TEXTOR. The pump limiter is a mechanical boundary that is laid out for taking the full heat load of TEXTOR, namely 8 MW (assuming 2 MW radiated power)for 10 s, and provides a pumping efficiency of at least 5% of the working gas. This layout is adopted from the requirements of a fusion reactor: It is mandatory to remove both the full power that is convected to the limiter or divertor and the helium ash that is generated in the fusion process. In order to obtain pumping for all gases, the ALT-II is equipped with turbomolecular pumps. A short description of ALT-II is given, and the power and particle fluxes to the limiter surface and into the exhaust scoops are discussed. Requirements of the helium removal rate for a reactor and relevant measurements are discussed, and particle removal and the power distribution to the limiters are treated. Related topics of the ALT-II program were hydrogen recycling and the measurement of turbulence-induced anomalous particle transport in the plasma edge. C1 Forschungszentrum Julich, EURATOM Assoc, Inst Plasmaphys, D-52425 Julich, Germany. Natl Inst Fus Sci, Gifu, Japan. Nagoya Univ, Dept Energy Engn & Sci, Nagoya, Aichi 4648603, Japan. Univ Calif San Diego, Dept Appl Mech & Engn Sci, San Diego, CA 92103 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Toyama Univ, Hydrogen Isotope Res Ctr, Toyama 9308555, Japan. RP Finken, KH (reprint author), Forschungszentrum Julich, EURATOM Assoc, Inst Plasmaphys, Trilateral Euregio Cluster, D-52425 Julich, Germany. EM k.h.finken@fz-juelich.de NR 73 TC 8 Z9 8 U1 0 U2 2 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 1536-1055 J9 FUSION SCI TECHNOL JI Fusion Sci. Technol. PD FEB PY 2005 VL 47 IS 2 BP 126 EP 137 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 895PT UT WOS:000226876100009 ER PT J AU Donne, AJH De Bock, MFM Classen, IGJ Von Hellermann, MG Jakubowska, K Jaspers, R Barth, CJ Van der Meiden, HJ Oyevaar, T Van de Pol, MJ Varshney, SK Bertschinger, G Biel, W Busch, C Finken, KH Koslowski, HR Kramer-Flecken, A Kreter, A Liang, Y Oosterbeek, H Zimmermann, O Telesca, G Verdoolaege, G Domier, CW Luhmann, NC Mazzucato, E Munsat, T Park, H Kantor, M Kouprienko, D Alexeev, A Ohdachi, S Korsholm, S Woskov, P Bindslev, H Meo, F Michelsen, PK Michelsen, S Nielsen, SK Tsakadze, E Shmaenok, L AF Donne, AJH De Bock, MFM Classen, IGJ Von Hellermann, MG Jakubowska, K Jaspers, R Barth, CJ Van der Meiden, HJ Oyevaar, T Van de Pol, MJ Varshney, SK Bertschinger, G Biel, W Busch, C Finken, KH Koslowski, HR Kramer-Flecken, A Kreter, A Liang, Y Oosterbeek, H Zimmermann, O Telesca, G Verdoolaege, G Domier, CW Luhmann, NC Mazzucato, E Munsat, T Park, H Kantor, M Kouprienko, D Alexeev, A Ohdachi, S Korsholm, S Woskov, P Bindslev, H Meo, F Michelsen, PK Michelsen, S Nielsen, SK Tsakadze, E Shmaenok, L TI Overview of core diagnostics for TEXTOR SO FUSION SCIENCE AND TECHNOLOGY LA English DT Article DE TEXTOR; diagnostics; core diagnostics ID MULTIPOSITION THOMSON SCATTERING; ION TEMPERATURE-MEASUREMENTS; RUTHERFORD-SCATTERING; RUNAWAY ELECTRONS; SYNCHROTRON-RADIATION; CONFINED PLASMAS; MHD MODES; TOKAMAK; DENSITY; FLUCTUATIONS AB The diagnostic system of TEXTOR comprises about 50 individual diagnostic devices. Since the start of the Trilateral Euregio Cluster collaboration, part of the emphasis in the experimental program has shifted toward the study of physics processes in the plasma core. To aid these studies several new and advanced core diagnostics have been implemented, whereas a number of other core diagnostics have been upgraded to higher resolution, more channels, and better accuracy. In this paper a brief overview is given of the present set of plasma core diagnostics at TEXTOR. C1 EURATOM, FOM, Inst Plasma Phys Rijnhuizen, NL-3430 BE Nieuwegein, Netherlands. Forschungszentrum Julich, EURATOM Assoc, Inst Plasmaphys, D-52425 Julich, Germany. Univ Ghent, B-9000 Ghent, Belgium. Univ Calif Davis, Davis, CA 95616 USA. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. Multitech, St Petersburg 194021, Russia. Natl Inst Fus Studies, Toki, Japan. MIT, Cambridge, MA 02139 USA. Riso Natl Lab, DK-4000 Roskilde, Denmark. Phystex, Vaals, Netherlands. RP Donne, AJH (reprint author), EURATOM, FOM, Inst Plasma Phys Rijnhuizen, Trilateral Euregio Cluster,POB 1207, NL-3430 BE Nieuwegein, Netherlands. EM donne@rijnh.nl RI Meo, Fernando/A-3937-2012; Korsholm, Soren/A-4234-2012; Kantor, Mikhail/B-9601-2014; Michelsen, Poul/A-3866-2012; nielsen, stefan/G-6300-2013; Verdoolaege, Geert/I-4655-2012 OI Kantor, Mikhail/0000-0001-9512-2155; Kramer-Flecken, Andreas/0000-0003-4146-5085; Korsholm, Soren/0000-0001-7160-8361; Michelsen, Poul/0000-0001-7409-0131; nielsen, stefan/0000-0003-4175-3829; Verdoolaege, Geert/0000-0002-2640-4527 NR 55 TC 14 Z9 14 U1 1 U2 5 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 1536-1055 J9 FUSION SCI TECHNOL JI Fusion Sci. Technol. PD FEB PY 2005 VL 47 IS 2 BP 220 EP 245 PG 26 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 895PT UT WOS:000226876100017 ER PT J AU Bondarescu, R Allen, G Daues, G Kelley, I Russell, M Seidel, E Shalf, J Tobias, M AF Bondarescu, R Allen, G Daues, G Kelley, I Russell, M Seidel, E Shalf, J Tobias, M TI The Astrophysics Simulation Collaboratory Portal: a framework for effective distributed research SO FUTURE GENERATION COMPUTER SYSTEMS LA English DT Article DE grid computing; globus; cactus; Astrophysics Simulation Collaboratory Portal; GridLab AB We describe the Astrophysics Simulation Collaboratory (ASC) Portal, a collaborative environment in which distributed projects can perform research. The ASC project seeks to provide a web-based problem solving framework for the astrophysics community to harness Computational Grids. To facilitate collaboration amongst distributed researchers within a virtual organization, the ASC Portal supplies specialized tools for the management of large-scale numerical simulations and the resources on which they are performed. The ASC virtual organization uses the Cactus framework for studying numerical relativity and astrophysics phenomena. We describe the architecture of the ASC Portal and present its components with emphasis on elements related to the Cactus framework. (C) 2003 Elsevier B.V. All rights reserved. C1 Univ Illinois, Natl Ctr Supercomp Applicat, Champaign, IL 61820 USA. Univ Illinois, Dept Phys & Astron, Champaign, IL 61820 USA. Albert Einstein Inst, Max Planck Inst Gravitat Phys, Potsdam, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Washington Univ, St Louis, MO 63130 USA. RP Daues, G (reprint author), Univ Illinois, Natl Ctr Supercomp Applicat, Champaign, IL 61820 USA. EM ruxandra@ncsa.uiuc.edu; gabrielle.allen@aei.mpg.de; daues@ncsa.uiuc.edu; ikelley@aei.mpg.de; michael.russell@aei.mpg.de; edward.seidel@aei.mpg.de; jshalf@lbl.gov; mtobias@wugrav.wustl.edu OI Bondarescu, Ruxandra/0000-0003-0330-2736 NR 12 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-739X J9 FUTURE GENER COMP SY JI Futur. Gener. Comp. Syst. PD FEB 1 PY 2005 VL 21 IS 2 BP 259 EP 270 DI 10.1016/j.future.2003.10.008 PG 12 WC Computer Science, Theory & Methods SC Computer Science GA 888XH UT WOS:000226407000003 ER PT J AU Sandiford, M Coblentz, D Schellart, WP AF Sandiford, M Coblentz, D Schellart, WP TI Evaluating slab-plate coupling in the Indo-Australian plate SO GEOLOGY LA English DT Article DE subduction; plate tectonics; stress; Indo-Australian plate; slabs ID INTRAPLATE STRESS-FIELD; CENTRAL INDIAN-OCEAN; LITHOSPHERE; FORCES; MANTLE; SUBDUCTION; DYNAMICS; MOTIONS AB Distributed seismicity in the central Indian Ocean affords a unique opportunity to evaluate the extent of slab-plate coupling in the Indo-Australian plate. The mix of reverse-fault and strike-slip mechanisms in this region, with northwest-southeast to north-south maximum horizontal stress, S-Hmax, implies that the effective slab pull is no more than similar to10% of the total negative buoyancy operating on the subducting slab. Numerical models of the intraplate stress field predict a slab-pull component along the Sumatra and Java boundary segments of 2.82 +/- 0.82 and 0.89 +/- 0.35 X 10(12) N(.)m(-1), respectively. Mantle tomographic constraints coupled with insights from analogue modeling suggest that the differences relate to variations in the depth extent of the slabs and the degree of slab support provided by the transition zone. These results help resolve apparent contradictions between insights from intraplate stress fields and plate dynamics; i.e., although plate motion is dominated by subduction, slab pull is only poorly expressed in the intraplate stress field because of low slab-plate coupling. C1 Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia. RP Sandiford, M (reprint author), Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia. RI Schellart, Wouter/A-1467-2008; Wright, Dawn/A-4518-2011; Sandiford, Mike/B-5020-2016 OI Wright, Dawn/0000-0002-2997-7611; Sandiford, Mike/0000-0002-9757-745X NR 25 TC 21 Z9 21 U1 2 U2 7 PU GEOLOGICAL SOC AMER, INC PI BOULDER PA PO BOX 9140, BOULDER, CO 80301-9140 USA SN 0091-7613 EI 1943-2682 J9 GEOLOGY JI Geology PD FEB PY 2005 VL 33 IS 2 BP 113 EP 116 DI 10.1130/G20898.1 PG 4 WC Geology SC Geology GA 894WA UT WOS:000226821100009 ER PT J AU Nichols, KK Bierman, PR Caffee, M Finkel, R Larsen, J AF Nichols, KK Bierman, PR Caffee, M Finkel, R Larsen, J TI Cosmogenically enabled sediment budgeting SO GEOLOGY LA English DT Article DE sediment yield; piedmont; erosion; sediment transport; Mojave Desert; Be-10 ID EROSION RATES; BE-10; AL-26; TRANSPORT; DESERT; NUCLIDES; SURFACES; INSITU AB We used Be-10 and Al-26 to constrain the millennial-scale sediment and nuclide budget for a common, long-studied, but poorly understood landform in and regions, the desert piedmont. We sampled the Chemehuevi Mountain piedmont, a complex multi-surfaced landform in the Mojave Desert, western United States. The nuclide data indicate that sediment is produced more rapidly (1.1 X 10(5) kg(.)yr(-1.)km(-2)) in steep mountain source basins than on the low-gradient pediment (4.0 X 10(4) kg(.)yr(-1.)km(-2)) or the intra-piedmont mountain range (2.5 X 10(4) kg(.)yr(-1.)km(-2)). However, the bulk of the sediment in transport is derived from erosion of the large abandoned alluvial surface (3.9 X 10(4) kg(.)yr(-1.)km(-2)). The combination of mass and nuclide budgeting suggests that sediment transport speeds decrease downslope from tens of meters per year in confined channels on the proximal pediment to decimeters per year in unconfined distributaries on distal wash surfaces. The sediment and nuclide budgeting approach we use is particularly valuable in and regions where geomorphically significant events are infrequent and dating control is poor, thus confounding traditional sediment-budgeting techniques. C1 Univ Vermont, Dept Geol, Burlington, VT 05405 USA. Univ Vermont, Sch Nat Resources, Burlington, VT 05405 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94405 USA. Univ Vermont, Dept Geol, Burlington, VT 05405 USA. RP Nichols, KK (reprint author), Skidmore Coll, Dept Geosci, Saratoga Springs, NY 12866 USA. EM knichols@skidmore.edu RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 25 TC 26 Z9 26 U1 0 U2 6 PU GEOLOGICAL SOC AMERICA, INC PI BOULDER PA PO BOX 9140, BOULDER, CO 80301-9140 USA SN 0091-7613 J9 GEOLOGY JI Geology PD FEB PY 2005 VL 33 IS 2 BP 133 EP 136 DI 10.1130/G21006.1 PG 4 WC Geology SC Geology GA 894WA UT WOS:000226821100014 ER PT J AU Maxfield, BT Ginosar, DM McMurtrey, RD Rollins, HW Shook, GM AF Maxfield, BT Ginosar, DM McMurtrey, RD Rollins, HW Shook, GM TI The effect of moisture content on retention of fluorocarbon tracers on sand SO GEOTHERMICS LA English DT Article DE tracers; hydrofluorocarbons; perfluorocarbons; freons ID PERFLUOROCARBON TRACER; TECHNOLOGY; FIELD AB Several fluorocarbon compounds have been evaluated as geothermal, tracers in sand column tests using damp, dry, and untreated 'washed sea sand'. Fluorocarbons evaluated in these tests included two hydrofluorocarbon freons: trifluoromethane (R23) and 1,1,1,2-tetrafluoroethane (R134a), and five perfluorocarbons: perfluorodimethylcyclobutane, perfluoromethyleyclopentane, perfluoromethylcyclohexane, perfluorodimethylcyclohexane and perfluorotrimethylcyclohexane. Transport of the fluorocarbon compounds was explored in flowing helium at 23 and 60degreesC. This work found that fluorocarbon retention is strongly affected by sand moisture content. The fluorocarbon compounds flowed with the bulk fluid when the sand was damp, but were significantly retained by the solid phase when the sand was thoroughly dried. The data suggest that the fluorocarbons may be conservative tracers in geothermal conditions up to mild superheat but they may not be conservative at geothermal conditions with a high degree of superheat. (C) 2004 CNR. Published by Elsevier Ltd. All rights reserved. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Maxfield, BT (reprint author), Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. EM bmaxfiel@inel.gov RI Rollins, Harry/B-6327-2017 OI Rollins, Harry/0000-0002-3926-7445 NR 29 TC 3 Z9 3 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0375-6505 J9 GEOTHERMICS JI Geothermics PD FEB PY 2005 VL 34 IS 1 BP 47 EP 60 DI 10.1016/j.geothermics.2004.06.003 PG 14 WC Energy & Fuels; Geosciences, Multidisciplinary SC Energy & Fuels; Geology GA 897RF UT WOS:000227021900003 ER PT J AU Khokhryakov, VF Suslova, KG Vostrotin, VV Romanov, SA Eckerman, KF Krahenbuhl, MP Miller, SC AF Khokhryakov, VF Suslova, KG Vostrotin, VV Romanov, SA Eckerman, KF Krahenbuhl, MP Miller, SC TI Adaptation of the ICRP Publication 66 Respiratory Tract Model to data on plutonium biokinetics for Mayak workers SO HEALTH PHYSICS LA English DT Article DE plutonium; lungs, human; modeling, biological factors; biokinetics ID PRODUCTION-ASSOCIATION; LUNG AB The biokinetics of inhaled plutonium were analyzed using compartment models representing their behavior within the respiratory tract, the gastrointestinal tract, and in systemic tissues. The processes of aerosol deposition, particle transport, absorption, and formation of a fixed deposit in the respiratory tract were formulated in the framework of the Human Respiratory Tract Model described in ICRP Publication 66. The values of parameters governing absorption and formation of the fixed deposit were established by fitting the model to the observations in 530 autopsy cases. The influence of smoking on mechanical clearance of deposited plutonium activity was considered. The dependence of absorption on the aerosol transportability, as estimated by in vitro methods (dialysis), was demonstrated. The results of this stud.), were compared to those obtained from an earlier model of plutonium behavior in the respiratory tract, which was based on the same set of autopsy data. That model did not address the early phases of respiratory clearance and hence underestimated the committed lung dose by about 25% for plutonium oxides. Little difference in lung dose was found for nitrate forms. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. So Ural Biophys Inst, Ozyorsk 456780, Chelyabinsk Reg, Russia. Univ Utah, Salt Lake City, UT 84108 USA. RP Eckerman, KF (reprint author), Oak Ridge Natl Lab, 1060 Commerce Pk, Oak Ridge, TN 37830 USA. EM kfe@ornl.gov NR 13 TC 19 Z9 21 U1 0 U2 4 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD FEB PY 2005 VL 88 IS 2 BP 125 EP 132 DI 10.1097/01.HP.0000144575.37546.9d PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 889VO UT WOS:000226471100003 PM 15650587 ER PT J AU Simpkins, AA AF Simpkins, AA TI Method for estimating ingestion doses to the public near the Savannah River Site following an accidental atmospheric release SO HEALTH PHYSICS LA English DT Article DE ingestion; dose, internal; exposure, population; emissions, atmospheric ID MODEL AB At the Savannah River Site, emergency response computer models are used to estimate dose following releases of radioactive materials to the environment. Downwind air and ground concentrations and their associated doses from inhalation and ground shine pathways are estimated. The emergency response model (PUFF-PLUME) uses real-time data to track either instantaneous (puff) or continuous (plume) releases. A site-specific ingestion dose model was developed for use with PUFF-PLUME that includes the following ingestion dose pathways pertinent to the surrounding Savannah River Site area: milk, beef, water, and fish. The model is simplistic and can be used with existing code output. C1 Savannah River Natl Lab, Aiken, SC 29808 USA. RP Simpkins, AA (reprint author), Savannah River Natl Lab, Savannah River Site, Aiken, SC 29808 USA. EM ali.simpkins@srs.gov NR 16 TC 1 Z9 1 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD FEB PY 2005 VL 88 IS 2 BP 133 EP 138 DI 10.1097/01.HP.0000144571.50744.ce PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 889VO UT WOS:000226471100004 PM 15650588 ER PT J AU Degteva, MO Anspaugh, LR Akleyev, AV Jacob, P Ivanov, DV Wieser, A Vorobiova, MI Shishkina, EA Shved, VA Vozilova, A Bayankin, SN Napier, BA AF Degteva, MO Anspaugh, LR Akleyev, AV Jacob, P Ivanov, DV Wieser, A Vorobiova, MI Shishkina, EA Shved, VA Vozilova, A Bayankin, SN Napier, BA TI Electron paramagnetic resonance and fluorescence in situ hybridization-based investigations of individual doses for persons living at Metlino in the upper reaches of the Techa River SO HEALTH PHYSICS LA English DT Article DE dose assessment; effluents; environmental assessment; gamma radiation ID CHROMOSOME-ABERRATIONS; HUMAN-LYMPHOCYTES; DOSIMETRY SYSTEM; GAMMA-RAYS; RECONSTRUCTION; POPULATION; TRANSLOCATIONS; RADIATION; SR-90; EXPOSURE AB Waterborne releases to the Techa River from the Mayak Production Association in Russia during 1949-1956 resulted in significant doses to persons living downstream; the most contaminated village was Metlino, about 7 km from the site of release. Internal and external doses have been estimated for these residents using the Techa River Dosimetry System2000 (TRDS-2000); the primary purpose is to support epidemiological studies of the members of the Extended Techa River Cohort. Efforts to validate the calculations of external and internal dose are considered essential. One validation study of the TRDS-2000 system has been performed by the comparison of calculated doses to quartz from bricks in old buildings at Metlino with those measured by luminescence dosimetry. Two additional methods of validation considered here are electron paramagnetic resonance (EPR) measurements of teeth and fluorescence in situ hybridization (FISH) measurements of chromosome translocations in circulating lymphocytes. For electron paramagnetic resonance, 36 measurements on 26 teeth from 16 donors from Metlino were made at the GSF-National Research Center for Environment and Health (16 measurements) and the Institute of Metal Physics (20 measurements); the correlation among measurements made at the two laboratories has been found to be 0.99. Background measurements were also made on 218 teeth (63 molars, 128 premolars, and 27 incisors). Fluorescence in situ hybridization measurements were made for 31 residents of Metlino. These measurements were handicapped by the analysis of a limited number of c ells; for several individuals no stable translocations were observed. Fluorescence in situ hybridization measurements were also made for 39 individuals believed to be unexposed. The EPR- and FISH-based estimates agreed well for permanent residents of Metlino: 0.67 +/- 0.21 Gy and 0.48 +/- 0.18 Gy (mean standard error of the mean), respectively. Results of the two experimental methods also agreed well with the estimates derived from the use of the TRDS-2000. For all persons investigated according to each technique, the EPR-measured dose to enamel was 0.55 +/- 0.17 Gy, and the TRDS-2000 prediction for the dose to enamel for these individuals is 0.55 +/- 0.07 Gy. The fluorescence, in Am hybridization-based dose, 038 +/- 0.10 Gy.. compared well to the TRDS-2000 prediction of external dose. 031 +/- 0.03 Gy2 to red bone marrow for these persons. Validation of external doses at the remaining villages is an active area of investigation. C1 Urals Res Ctr Radiat Med, Chelyabinsk 454076, Russia. Univ Utah, Dept Radiol, Div Radiobiol, Salt Lake City, UT 84108 USA. GSF Natl Res Ctr Environm & Hlth, D-85764 Neuherberg, Germany. Inst Met Phys, Ekaterinburg 620219, Russia. Battelle Pacific NW Natl Lab, Richland, WA 99352 USA. RP Anspaugh, LR (reprint author), POB 171319, Salt Lake City, UT 84117 USA. EM lanspaugh@aol.com RI Ivanov, Denis/J-3235-2013; Shishkina, Elena/G-4595-2016 OI Ivanov, Denis/0000-0001-6757-5587; Shishkina, Elena/0000-0003-4464-0889 NR 38 TC 25 Z9 29 U1 0 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD FEB PY 2005 VL 88 IS 2 BP 139 EP 153 DI 10.1097/01.HP.0000146612.69488.9c PG 15 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 889VO UT WOS:000226471100005 PM 15650589 ER PT J AU Fasso, A AF Fasso, A TI Radiation protection for particle accelerator facilities SO HEALTH PHYSICS LA English DT Book Review C1 SLAC RP, Menlo Pk, CA 94025 USA. RP Fasso, A (reprint author), SLAC RP, MS 4S,2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM fasso@slac.stanford.edu NR 1 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD FEB PY 2005 VL 88 IS 2 BP 175 EP 175 DI 10.1097/00004032-200502000-00009 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 889VO UT WOS:000226471100009 ER PT J AU Love, LJ Jansen, JF McKnight, TE Roh, Y Phelps, TJ Yeary, LW Cunningham, GT AF Love, LJ Jansen, JF McKnight, TE Roh, Y Phelps, TJ Yeary, LW Cunningham, GT TI Ferrofluid field induced flow for microfluidic applications SO IEEE-ASME TRANSACTIONS ON MECHATRONICS LA English DT Article DE ferrofluid; microfluidics; multidomain finite element analysis ID MICROPUMP; FABRICATION; TECHNOLOGY; DIAPHRAGM AB Exposing a column of ferrofluid to coincident magnetic and thermal fields produces a pressure gradient in the magnetic fluid. As the column of ferrofluid heats up, it loses its attraction to the magnetic field and is displaced by cooler fluid. Subsequently, it is possible to generate a ferrofluid pump with no moving mechanical parts. Until recently, limitations in the magnetic and thermal properties of conventional materials severely limited operating pressures. Advancements in the design and synthesis of metal substituted magnetite enable fine control over both the magnetic and thermal properties of magnetic nanoparticles, a key element in ferrofluids. This manuscript covers three recent contributions to the design of ferrofluid. pumps. First, we introduce a new approach to the synthesis of metal substituted magnetite nanoparticles based on thermophilic metal-reducing bacteria. Next, we extend the previous work in the modeling of the ferrofluid pumps to include the coupling between each of the three fundamental domains: magnetic, thermal and fluid dynamic. We validate these models with a comparison between experimental results and a multidomain finite element model. Our results show a good match between the model and experiment as well as approximately an order of magnitude increase in the fluid flow rate over conventional magnetite based ferrofluids operating below 80degreesC. Finally, as a practical demonstration; we describe a novel application of this technology: pumping fluids at the microfluidic scale. C1 Oak Ridge Natl Lab, Robot & Energet Syst Grp, Oak Ridge, TN 37922 USA. Oak Ridge Natl Lab, Monolith Syst Dev Crp, Oak Ridge, TN 37922 USA. Oak Ridge Natl Lab, Appl environm Sci & Technol Grp, Oak Ridge, TN 37922 USA. Tennessee Technol Univ, Dept Mech Engn, Cookeville, TN 38505 USA. RP Love, LJ (reprint author), Oak Ridge Natl Lab, Robot & Energet Syst Grp, Oak Ridge, TN 37922 USA. EM lovelj@ornl.gov RI phelps, tommy/A-5244-2011; McKnight, Tim/H-3087-2011 OI McKnight, Tim/0000-0003-4326-9117 NR 27 TC 36 Z9 36 U1 2 U2 20 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1083-4435 J9 IEEE-ASME T MECH JI IEEE-ASME Trans. Mechatron. PD FEB PY 2005 VL 10 IS 1 BP 68 EP 76 DI 10.1109/TMECH.2004.842224 PG 9 WC Automation & Control Systems; Engineering, Manufacturing; Engineering, Electrical & Electronic; Engineering, Mechanical SC Automation & Control Systems; Engineering GA 899FR UT WOS:000227130800009 ER PT J AU Reines, IC Goldsmith, CL Nordquist, CD Dyck, CW Kraus, GM Plut, TA Finnegan, PS Austin, F Sullivan, CT AF Reines, IC Goldsmith, CL Nordquist, CD Dyck, CW Kraus, GM Plut, TA Finnegan, PS Austin, F Sullivan, CT TI A low loss RF MEMS K u-band integrated switched filter bank SO IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS LA English DT Article DE end-coupled filters; microelectromechanical systems (MEMS) filters; MEMS devices; microstrip filters; RF MEMS; tunable filters AB A switched Ku-band filter bank has been developed using two single-pole triple-throw (SP3T) microelectromechanical systems (MEMS) switching networks, and three fixed three-pole end-coupled bandpass filters. A tuning range of 17.7% from 14.9 to 17.8 GHz was achieved with a fractional bandwidth of 7.7 +/- 2.9%, and mid-band insertion loss ranging from 1.7 to 2.0 dB. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. L&M Technol, Albuquerque, NM 87109 USA. MEMtron Corp, Plano, TX 75075 USA. Plus Grp, Albuquerque, NM 87112 USA. RP Reines, IC (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM icreine@sandia.gov NR 5 TC 21 Z9 22 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1531-1309 J9 IEEE MICROW WIREL CO JI IEEE Microw. Wirel. Compon. Lett. PD FEB PY 2005 VL 15 IS 2 BP 74 EP 76 DI 10.1109/LMWC.2004.842823 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA 894LA UT WOS:000226792000010 ER PT J AU Cao, HJ Ling, H Liu, CY Deng, H Benavidez, M Smagley, VA Caldwell, RB Peake, GM Smolyakov, GA Eliseev, PG Osinski, M AF Cao, HJ Ling, H Liu, CY Deng, H Benavidez, M Smagley, VA Caldwell, RB Peake, GM Smolyakov, GA Eliseev, PG Osinski, M TI Large S-section-ring-cavity diode lasers: Directional switching, electrical diagnostics, and mode beating spectra SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article DE directional switching; mode beating spectra; ring diode laser; unidirectional operation ID UNIDIRECTIONAL OPERATION; BISTABILITY AB Semiconductor lasers with monolithically integrated ring cavities exceeding 1 cm in perimeter were fabricated and characterized optically and electrically. Directional switching was observed, influenced by S-section seeding of unidirectional operation. The lasing threshold was identified by differential current-voltage measurements, which are also shown to be useful in monitoring directional switching. Mode beating was observed at three radio-frequency bands: 7.6, 15.2, and 22.9 GHz. C1 Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. PN Lebedev Phys Inst, Moscow 117924, Russia. RP Cao, HJ (reprint author), Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA. EM hjcao@chtm.unm.edu; linghai@chtm.unm.edu; cliu@chtm.unm.edu; huideng@chtm.unm.edu; marcita@chtm.unm.edu; vladimir@chtm.unm.edu; caldwell@chtm.unm.edu; gmpeake@sandia.gov; gen@chtm.unm.edu; eliseev@chtm.unm.edu; osinski@chtm.unm.edu NR 12 TC 17 Z9 17 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 2005 VL 17 IS 2 BP 282 EP 284 DI 10.1109/LPT.2004.840060 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA 889ZO UT WOS:000226481700007 ER PT J AU Monacelli, B Pryor, JB Munk, BA Kotter, D Boreman, GD AF Monacelli, B Pryor, JB Munk, BA Kotter, D Boreman, GD TI Infrared frequency selective surface based on circuit-analog square loop design SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article DE frequency selective surfaces (FSS); infrared measurements; infrared radiometry ID SPECTRAL BEHAVIOR; BANDPASS-FILTERS; MOLECULAR-WEIGHT; ARRAY; TRANSMISSION; SCATTERING; EMISSION; PATCHES AB A frequency selective surface (FSS) was designed to have a resonant spectral signature in the infrared. The lithographically composed, layered structure of this infrared FSS yields a resonant response in absorption to infrared radiation at a wavelength determined by its FSS element structure and the structure of its substrate layers. The infrared spectral characteristics of this surface are studied via Fourier transform infrared spectroscopy and spectral radiometry in the 3 to 15 mum region of the spectrum. The design is based on circuit-analog resonant behavior of square loop conducting elements. C1 Univ Cent Florida, Coll Opt & Photon CREOL & FPCE, Orlando, FL 32816 USA. Ohio State Univ, Electrosci Lab, Columbus, OH 43212 USA. Idaho Natl Lab, Idaho Falls, ID 83415 USA. RP Univ Cent Florida, Coll Opt & Photon CREOL & FPCE, Orlando, FL 32816 USA. EM Monacelli@CREOL.UCF.edu RI zhou, hang/H-3387-2011 NR 42 TC 45 Z9 47 U1 1 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-926X EI 1558-2221 J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD FEB PY 2005 VL 53 IS 2 BP 745 EP 752 DI 10.1109/TAP.2004.841290 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA 896OT UT WOS:000226944100018 ER PT J AU Mei, T Roychowdhury, J Coffey, TS Hutchinson, SA Day, DM AF Mei, T Roychowdhury, J Coffey, TS Hutchinson, SA Day, DM TI Robust, stable time-domain methods for solving MPDEs of fast/slow systems SO IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS LA English DT Article DE discretization; eigenstructure; envelope; multi-time partial differential equation (MPDE); stability; time-domain ID STEADY-STATE ANALYSIS; NONLINEAR CIRCUITS; SIMULATION AB In this paper, we explore the stability properties of time-domain numerical methods for multitime partial differential equations (MPDEs) in detail. We demonstrate that simple techniques for numerical discretization can lead easily to instability. By investigating the underlying eigenstructure of several discretization techniques along different artificial time scales, we show that not all combinations of techniques are stable. We identify choices of discretization method and step size, along fast and slow time scales, that lead to robust, stable time-domain integration methods for the MPDE. One of our results is that applying overstable methods along one time-scale can compensate for unstable discretization along others. Our novel integration schemes bring robustness to time-domain MPDE solution methods, as we demonstrate with examples. C1 Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA. EM meiting@ece.umn.edu NR 40 TC 15 Z9 15 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0278-0070 EI 1937-4151 J9 IEEE T COMPUT AID D JI IEEE Trans. Comput-Aided Des. Integr. Circuits Syst. PD FEB PY 2005 VL 24 IS 2 BP 226 EP 239 DI 10.1109/TCAD.2004.841073 PG 14 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA 889YL UT WOS:000226478700007 ER PT J AU Hamilton, CA Kupferman, SL Salazar, MT Deaver, D Wood, BM AF Hamilton, CA Kupferman, SL Salazar, MT Deaver, D Wood, BM TI Interlaboratory comparison at 10 V dc SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article DE interlaboratory comparison; Josephson voltage standard; zener reference standard ID JOSEPHSON VOLTAGE STANDARDS AB An interlaboratory comparison at 10 V dc has been made among 16 national, industrial, and military standards laboratories in North America. The comparison used a set of four traveling Zener dc reference standards. A pivot laboratory made measurements at the beginning, at the end, and at four other times during the comparison. The measured differences and their uncertainties are reported and used to demonstrate equivalence between each participant and the pivot, and between each participant and the National Institute of Standards and Technology (NIST). All of the differences fall within two parts in 10(8). C1 VMetrix LLC, Boulder, CO 80303 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Fluke Corp, Everett, WA 98206 USA. Natl Res Council Canada, Ottawa, ON K1A 0R6, Canada. RP Hamilton, CA (reprint author), VMetrix LLC, Boulder, CO 80303 USA. NR 11 TC 3 Z9 3 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD FEB PY 2005 VL 54 IS 1 BP 215 EP 221 DI 10.1109/TIM.2004.838134 PG 7 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA 887ZA UT WOS:000226342800027 ER PT J AU Tang, YH Kupferman, SL Salazar, MT AF Tang, YH Kupferman, SL Salazar, MT TI An evaluation of two methods for comparing Josephson voltage standards of two laboratories SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article DE Josephson voltage standard (JVS); measurement assurance program (MAP); transfer standard; traveling standards; uncertainty; Zener voltage standards ID OUTPUT AB The 10 V Josephson voltage standard (JVS) systems of the National Institute of Standard's and Technology (NIST) and the Sandia National Laboratories (SNL) were compared by two different methods used simultaneously. The first method uses the well-established technique of the NIST's Measurement Assurance Program (MAP) in which Zener-diode electronic voltage standards (often called Zener voltage standards) are used as traveling standards. The second method, reported here for the first time, used a recently developed portable JVS as the traveling standard. This method provides a thorough verification of a JVS system including all the components of hardware and software as they are used normally to calibrate a secondary voltage standard. The uncertainty of the second method was more than an order of magnitude smaller and provided a way to evaluate the uncertainty associated with the predictability of Zeners when used as traveling standards. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Tang, YH (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. NR 12 TC 2 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD FEB PY 2005 VL 54 IS 1 BP 398 EP 403 DI 10.1109/TIM.2004.840236 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA 887ZA UT WOS:000226342800054 ER PT J AU Qi, JY AF Qi, JY TI Noise propagation in iterative reconstruction algorithms with line searches SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE emission tomography; iterative image reconstruction; noise analysis ID LIKELIHOOD IMAGE-RECONSTRUCTION; SPATIAL-RESOLUTION PROPERTIES; EMISSION TOMOGRAPHY; EM ALGORITHM; TRANSMISSION TOMOGRAPHY; MAXIMUM-LIKELIHOOD; MAP RECONSTRUCTION; PET; DETECTABILITY; VARIANCE AB In this paper, we analyze the propagation of noise in iterative image reconstruction algorithms. We derive theoretical expressions for the general form of preconditioned gradient algorithms with line searches. The results are applicable to a wide range of iterative reconstruction problems, such as emission tomography, transmission tomography, and image restoration. A unique contribution of this paper compared to the previous work [1] is that the line search is explicitly modeled and we do not use the approximation that the gradient of the objective function is zero. As a result, the accuracy of the theoretical prediction is significantly improved. C1 Univ Calif Davis, Dept Biomed Engn, Davis, CA 95616 USA. Lawrence Berkeley Natl Lab, Dept Nucl Med & Funct Imaging, Berkeley, CA 94720 USA. RP Qi, JY (reprint author), Univ Calif Davis, Dept Biomed Engn, Davis, CA 95616 USA. EM qi@ucdavis.edu RI Qi, Jinyi/A-1768-2010 OI Qi, Jinyi/0000-0002-5428-0322 NR 23 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 57 EP 62 DI 10.1109/TNS.2005.843610 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QT UT WOS:000228168700010 ER PT J AU Qi, JY Huber, JS Huesman, RH Moses, WW Derenzo, SE Budinger, TF AF Qi, JY Huber, JS Huesman, RH Moses, WW Derenzo, SE Budinger, TF TI Septa design for a prostate specific PET camera SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE cancer detection; positron emission tomography; prostate cancer; septa design; system optimization ID POSITRON-EMISSION-TOMOGRAPHY; MONTE-CARLO-SIMULATION; LESION DETECTABILITY; PERFORMANCE; OBSERVERS AB The recent development of new prostate tracers has motivated us to build a low cost PET camera optimized to image the prostate. Coincidence imaging of positron emitters is achieved using a pair of curved detector banks. The bottom bank is fixed below the patient bed, and the top bank (which is above the patient) moves upward for patient access and downward for maximum sensitivity. In this paper, we study the design of septa for the prostate camera using Monte Carlo simulations. The system performance is measured by the detectability of a prostate tumor and by the conventional noise equivalent count (NEC). We have studied 27 septa configurations. The results show that septa design has a large impact on the lesion detection at a given activity concentration. At the background activity level of 0.1 mu Ci/cc, sparse septa with 8-crystal spacing outperforms the traditional two-dimension (inter-plane septa) and three-dimension (septaless) designs in terms of both the lesion detection and NEC. Significant differences are observed between the lesion detectability and NEC performance, indicating that the NEC may not be suitable for this lesion detection task. C1 Univ Calif Davis, Dept Biomed Engn, Davis, CA 95616 USA. Lawrence Berkeley Natl Lab, Dept Funct Imaging, Berkeley, CA 94720 USA. RP Qi, JY (reprint author), Univ Calif Davis, Dept Biomed Engn, Davis, CA 95616 USA. EM qi@ucdavis.edu RI Qi, Jinyi/A-1768-2010 OI Qi, Jinyi/0000-0002-5428-0322 NR 15 TC 6 Z9 6 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 107 EP 113 DI 10.1109/TNS.2004.843132 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QT UT WOS:000228168700017 ER PT J AU Gullberg, GT Zeng, GSL AF Gullberg, GT Zeng, GSL TI Cardiac single-photon emission-computed tomography using combined cone-beam/fan-beam collimation SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE cardiac; convergent collimation; iterative image reconstruction; single-photon emission-computed tomography (SPECT) ID CORONARY-ARTERY DISEASE; INCREMENTAL PROGNOSTIC VALUE; FILTERED BACKPROJECTION RECONSTRUCTION; MYOCARDIAL PERFUSION SCINTIGRAPHY; ISCHEMIC-HEART-DISEASE; SIMULTANEOUS TRANSMISSION; ITERATIVE RECONSTRUCTION; FAN-BEAM; TECHNETIUM-99M-SESTAMIBI SPECT; RISK STRATIFICATION AB The objective of this work is to increase system sensitivity in cardiac single-photon emission-computed tomography (SPECT) studies without increasing patient imaging time. For imaging the heart, convergent collimation offers the potential of increased sensitivity over that of parallel-hole collimation. However, if a cone-beam collimated gamma camera is rotated in a planar orbit, the projection data obtained are not complete. Two cone-beam collimators and one fan-beam collimator are used with a three-detector SPECT system. The combined cone-beam/ fan-beam collimation provides a complete set of data for image reconstruction. The imaging geometry is evaluated using data acquired from phantom and patient studies. For the Jaszazck cardiac torso phantom. experiment, the combined cone-beam/fan-beam collimation provided 1.7 times greater sensitivity than standard parallel-hole collimation (low-energy high-resolution collimators). Also, phantom and patient comparison studies showed improved image quality. The combined cone-beam/fan-beam imaging geometry with appropriate weighting of the two data sets provides improved system sensitivity while measuring sufficient data for artifact free cardiac images. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Utah, Dept Radiol, Salt Lake City, UT 84108 USA. RP Gullberg, GT (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM gtgullberg@lbl.gov NR 63 TC 8 Z9 8 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 143 EP 153 DI 10.1109/TNS.2004.843118 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QT UT WOS:000228168700023 ER PT J AU Choong, WS Moses, WW Tindall, CS Luke, PN AF Choong, WS Moses, WW Tindall, CS Luke, PN TI Design for a high-resolution small-animal SPECT system using pixellated Si(Li) detectors for in vivo I-125 imaging SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE in vivo; iodine-125; lithium-drifted silicon [Si(Li)]; pixellated detector; small-animal; single-photon emission computed tomography (SPECT) ID STRIP DETECTORS; SILICON; TOMOGRAPHY; CAMERAS AB We propose a design for a high-resolution single-photon emission computed tomography (SPECT) system for in vivo (125) I imaging in small animal using pixellated lithium-drifted silicon [Si(Li)] detectors. The proposed detectors are expected to have high interaction probability (>90%), good energy resolution [< 15% full-width at half-maximum (FWHM)], and good intrinsic spatial resolution (similar to 1 mm FWHM). The SPECT system will consist of a dual head detector geometry with the distance between the detectors ranging 30-50 mm to minimize the imaging distance between the mouse and the detectors. The detectors, each with an active area of 64 x 40 mm [64 x 40 array of 1 mm(2) pixels and a 6 mm thick Si(Li) detector], will be mounted on a rotating gantry with an axial field-of-view of 64 mm. The detector signals will be read out by custom application-specific integrated circuits (ASICs). Using a high-resolution parallel-hole collimator, the expected spatial resolution is 1.6 mm. FWHM at an imaging distance of 20 mm, and sensitivity is 6.7 cps/mu Ci. 1251 is a readily available radioisotope with a long half-life of 59.4 days and it is commonly used to label biological compounds in molecular biology. Conventional gamma cameras are not optimized to detect the low emission energies (27 to 35 keV) of (125) I. However, Si(Li) detector provides an ideal solution for detecting the low-energy emissions of I-125. In addition to presenting the design of the system, this paper presents a feasibility study of using Si(Li) detectors to detect the emissions of I-125. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Choong, WS (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM wschoong@lbl.gov NR 31 TC 10 Z9 10 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 174 EP 180 DI 10.1109/TNS.2004.843146 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QT UT WOS:000228168700027 ER PT J AU Kwon, SI Lynch, M Prokop, M AF Kwon, SI Lynch, M Prokop, M TI Decoupling PI controller design for a normal conducting RF cavity using a recursive Levenberg-Marquardt algorithm SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE capacitor bank droop; high voltage power supply ripple; least square; Levenberg-Marquardt algorithm; normal conducting RF cavity; operating point; PI feedback control; spallation neutron source; system identification AB This paper addresses the system identification and the decoupling PI controller design for a normal conducting RF cavity. Based on the open-loop measurement data of an SNS DTL cavity, the open-loop system's bandwidths and loop time delays are estimated by using hatched least square. With the identified system, a PI controller is designed in such a way that it suppresses the time varying klystron droop and decouples the In-phase and Quadrature of the cavity field. The Levenberg-Marquardt algorithm is applied for nonlinear least squares to obtain the optimal PI controller parameters. The tuned PI controller gains are downloaded to the low-level RF system by using channel access. The experiment of the closed-loop system is performed and the performance is investigated. The proposed tuning method is running automatically in real time interface between a host computer with controller hardware through ActiveX Channel Access. C1 Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA. RP Kwon, SI (reprint author), Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87545 USA. EM skwon@lanl.gov NR 21 TC 3 Z9 3 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 440 EP 449 DI 10.1109/TNS.2004.842732 PN 3 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QW UT WOS:000228169000004 ER PT J AU Bolotnikov, AE Baker, J DeVito, R Sandoval, J Szurbart, L AF Bolotnikov, AE Baker, J DeVito, R Sandoval, J Szurbart, L TI HgI2 detector with a virtual Frisch ring SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article DE Frisch-ring detectors; HgI2 detectors; virtual Frisch-grid detectors ID CDZNTE DETECTORS; PERFORMANCE AB We investigated the performance of the modification of a Frisch-ring device design applied to the bar shaped HgI2 detector. In this device, the ring electrode, separated from the detector surface by thin insulating layer, is extended to cove the entire area of side surfaces of the crystal, and connected to the cathode. To fabricate this device the side surfaces of 3 x 3 x 6 mm(3) HgI2 crystals were wrapped in a Cu foil separated from the crystal by a thin layer of a Teflon tape. These bar-shaped HgI2 detectors can be used in large-area high-efficiency detector arrays that are in demand for medical imaging and nuclear materials detection. We obtained an energy resolution of similar to 5% FWHM at 511 keV with our tested detectors. This is a very good result for the HgI2 detector of such thickness. However, this resolution is far away from the theoretical limit predicted for HgI2 material. This paper analyzes several factors affecting the energy resolution of this type of the virtual Frisch-grid devices, of which the fluctuation of charge loss due to electron trapping by local defects with high concentration of traps seems is a dominant factor. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Constellat Technol Corp, Largo, FL 33777 USA. RP Bolotnikov, AE (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM bolotnik@bnl.gov NR 12 TC 10 Z9 10 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD FEB PY 2005 VL 52 IS 1 BP 468 EP 472 DI 10.1109/TNS.2004.842726 PN 3 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 913QW UT WOS:000228169000008 ER PT J AU Ekdahl, C Pedrow, P AF Ekdahl, C Pedrow, P TI Special issue on plenary and invited papers from ICOPS 2004 SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Editorial Material C1 Los Alamos Natl Lab, DARHT Accelerator Grp, Los Alamos, NM 87545 USA. Washington State Univ, Sch Elect Engn & Comp Sci, Pullman, WA 99164 USA. RP Ekdahl, C (reprint author), Los Alamos Natl Lab, DARHT Accelerator Grp, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 1 EP 2 DI 10.1109/TPS.2004.842364 PN 1 PG 2 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800001 ER PT J AU Kimura, WD Andreev, NE Babzien, M Ben-Zvi, I Cline, DB Dilley, CE Gottschalk, SC Hooker, SA Kusche, KP Kuznetsov, SV Pavlishin, IV Pogorelsky, IV Pogosova, AA Steinhauer, LC Ting, A Yakimenko, V Zigler, A Zhou, F AF Kimura, WD Andreev, NE Babzien, M Ben-Zvi, I Cline, DB Dilley, CE Gottschalk, SC Hooker, SA Kusche, KP Kuznetsov, SV Pavlishin, IV Pogorelsky, IV Pogosova, AA Steinhauer, LC Ting, A Yakimenko, V Zigler, A Zhou, F TI Pseudoresonant laser wakefield acceleration driven by 10.6-mu m laser light SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 31st International Conference on Plasma Science CY JUN, 2003 CL Baltimore, MD DE capillary discharge; carbon dioxide lasers; electron accelerators; laser accelerators; laser wakefield acceleration ID CHANNEL AB This paper describes an experiment to demonstrate, for the first time, laser wakefield acceleration (LWFA), driven by 10.6-mum light from a CO2 laser. This experiment is also noteworthy because it will operate in a pseudoresonant LWFA regime, in which the laser-pulse-length is too long for resonant LWFA, but too short for self-modulated LWFA. Nonetheless, high acceleration gradients are still possible. This experiment builds upon an earlier experiment called staged electron laser acceleration (STELLA), where efficient trapping and monoenergetic laser acceleration of electrons were demonstrated using inverse free electron lasers. The aim is to apply the STELLA approach of laser-driven microbunch formation followed by laser-driven trapping and acceleration to LWFA. These capabilities are important for a practical electron linear accelerator based upon LWFA. C1 STI Optron Inc, Bellevue, WA 98004 USA. Russian Acad Sci, Inst High Energy Densities, Moscow 125412, Russia. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Calif Los Angeles, Los Angeles, CA 90095 USA. Univ Oxford, Oxford OX1 3PU, England. Univ Washington, Redmond Plasma Phys Lab, Redmond, WA 98052 USA. USN, Res Lab, Washington, DC 20375 USA. Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel. RP Kimura, WD (reprint author), STI Optron Inc, Bellevue, WA 98004 USA. EM wkimura@stioptronics.com RI zigler, arie/C-2667-2012; Hooker, Simon/D-1402-2015 OI Hooker, Simon/0000-0002-1243-520X NR 18 TC 7 Z9 7 U1 2 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 3 EP 7 DI 10.1109/TPS.2004.841173 PN 1 PG 5 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800002 ER PT J AU Leemans, WP Esarey, E van Tilborg, J Michel, PA Schroeder, CB Toth, C Geddes, CGR Shadwick, BA AF Leemans, WP Esarey, E van Tilborg, J Michel, PA Schroeder, CB Toth, C Geddes, CGR Shadwick, BA TI Radiation from laser accelerated electron bunches: Coherent terahertz and femtosecond X-rays SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 31st International Conference on Plasma Science CY JUN, 2003 CL Baltimore, MD DE electromagnetic radiation; electron accelerators; lasers; plasmas; X-rays ID 90-DEGREES THOMSON SCATTERING; WAKEFIELD ACCELERATOR; RELATIVISTIC ELECTRONS; TRANSITION RADIATION; PLASMA INTERACTIONS; GENERATION; PULSES; BEAMS; INJECTION; BREAKING AB Electron beam based radiation sources provide electromagnetic radiation for countless applications. The properties of the radiation are primarily determined by the properties of the electron beam. Compact laser driven accelerators are being developed that can provide ultrashort electron bunches (femtosecond duration) with relativistic energies reaching toward a GeV. The electron bunches are produced when an intense laser interacts with a dense plasma and excites a large amplitude plasma density modulation (wakefield) that can trap background electrons and accelerate them to high energies. The short-pulse nature of the accelerated bunches and high particle energy offer the possibility of generating radiation from one compact source that ranges from coherent terahertz to gamma rays. The intrinsic synchronization to a laser pulse and unique character of the radiation offer a wide range of possibilities for scientific applications. Two particular radiation source regimes are discussed: coherent terahertz emission, and X-ray emission based on betatron oscillations and Thomson scattering. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Tech Univ Eindhoven, NL-5600 MB Eindhoven, Netherlands. Inst Adv Phys, Conifer, CO 80433 USA. RP Leemans, WP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Michel, Pierre/J-9947-2012; OI Schroeder, Carl/0000-0002-9610-0166 NR 54 TC 28 Z9 28 U1 2 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0093-3813 EI 1939-9375 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 8 EP 22 DI 10.1109/TPS.2004.841618 PN 1 PG 15 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800003 ER PT J AU Glebov, VY Stoeckl, C Sangster, IC Roberts, S Lerche, RA Schmid, GJ AF Glebov, VY Stoeckl, C Sangster, IC Roberts, S Lerche, RA Schmid, GJ TI NIF neutron bang time detector prototype test on OMEGA SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 31st International Conference on Plasma Science CY JUN, 2003 CL Baltimore, MD DE inertial confinement; neutron detectors; neutrons; national ignition facility (NIF) ID NATIONAL-IGNITION-FACILITY; STREAK CAMERA; DIAGNOSTICS; SYSTEM AB The time interval between the beginning of the laser pulse and the peak of neutron emission (bang time) is an important characteristic of inertial confinement fusion (ICF) implosions, directly comparable to numerical simulation. For this reason, neutron bang time (NBT) detectors have been successfully operated on ICF facilities such as the Nova and OMEGA lasers, and have been proposed as a core diagnostic for the National Ignition Facility (NIF). Prototypes of the NBT detector suitable for the NIF have been built and tested on the 60-beam OMEGA laser system. These prototypes have three channels. The first, most-sensitive channel consists of a fast plastic scintillator coupled with a microchannel-plate (MCP) photomultiplier tube (PMT). The second and third channels are based on a synthetic polycrystalline diamond produced by chemical vapor deposition (CVD). These three independent channels will be able to cover a wide range of DD and DT neutron yields: from 1 x 10(9) to 1 x 10(16). The signals from the NBT prototype channels are recorded on a fast digital oscilloscope. Absolute timing was accomplished using the OMEGA optical fiducial system. The NIF NBT prototypes show better than 100-ps timing accuracy, satisfying the NIF specification. C1 Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Glebov, VY (reprint author), Univ Rochester, Laser Energet Lab, 250 E River Rd, Rochester, NY 14623 USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 70 EP 76 DI 10.1109/TPS.2004.841171 PN 1 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800009 ER PT J AU Redmer, R Reinholz, H Ropke, G Thiele, R Holl, A AF Redmer, R Reinholz, H Ropke, G Thiele, R Holl, A TI Theory of X-ray Thomson scattering in dense plasmas SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 31st International Conference on Plasma Science CY JUN, 2003 CL Baltimore, MD DE diagnostic of dense plasmas; dielectric function; dynamic collision frequency; X-ray Thomson scattering ID RELAXATION-TIME APPROXIMATION; LINDHARD DIELECTRIC FUNCTION; HIGH-TEMPERATURE PLASMAS; 2-COMPONENT PLASMA; INTERPARTICLE CORRELATIONS; NONIDEAL PLASMAS; CONDUCTIVITY; DENSITIES; LIQUIDS; MATTER AB For the diagnostics of dense plasmas, photons in the vacuum ultraviolet (VUV) or X-ray domain are required. First experiments have demonstrated the great capacity of X-ray Thomson scattering for the determination of plasma parameters such as density, temperature, and ionization state. For a reliable interpretation of the experimental data, the interaction of energetic photons with the plasma has to be considered. The cross section for Thomson scattering is related to the dynamic structure factor S(k, w). We improve the usual random phase approximation by including collisions and calculate a dynamic collision frequency in Born approximation. We also study the influence of dynamic screening and the relation to the concept of dynamic local-field corrections to the dielectric function. We give results for a variety of plasma parameters and determine the region where collisions are of relevance. C1 Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Redmer, R (reprint author), Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany. EM ronald.redmer@physik.uni-rostock.de; hoell@phy.anl.gov RI Redmer, Ronald/F-3046-2013; OI Thiele, Robert/0000-0001-8350-9942 NR 36 TC 35 Z9 35 U1 0 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 77 EP 84 DI 10.1109/TPS.2004.841170 PN 1 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800010 ER PT J AU Carlsten, BE Russell, SJ Earley, LM Krawczyk, FL Potter, JM Ferguson, P Humphries, S AF Carlsten, BE Russell, SJ Earley, LM Krawczyk, FL Potter, JM Ferguson, P Humphries, S TI Technology development for a mm-wave sheet-beam traveling-wave tube SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 31st International Conference on Plasma Science CY JUN, 2003 CL Baltimore, MD DE beams; electron beam focusing; electron tubes; millimeter wave power amplifiers; traveling-wave tubes ID ELECTRON-BEAMS AB A sheet-beam traveling-wave amplifier has been proposed as a high-power generator of radio frequency (RF) from 95 to 300 GHz, using a microfabricated RF slow-wave structure (Carlsten, 2002). The planar geometry of microfabrication technologies matches well with the nearly planar geometry of a sheet beam, and the greater allowable beam current leads to high-peak power, high-average power, and wide bandwidths. Simulations of nominal designs using a vane-loaded waveguide as the slow-wave structure have indicated gains in excess of 1 dB/mm, with extraction efficiencies greater than 20% at 95 GHz with a 120-kV, 20-A electron beam. We have identified stable sheet beam formation and transport as the key enabling technology for this type of device. Also, due to the high aspect ratio in the slow-wave structure, the RF coupling is complicated and requires multiple input and output couplers. The RF mode must be transversely flat over the width of the electron beam, which impacts both the vane design and the input and output coupling. In this paper, we report on new insights on stable sheet-beam transport and RF mode control in the slow-wave structure. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. JP Accelerator Works, Los Alamos, NM 87544 USA. MDS Co, Oakland, CA 94611 USA. Field Precis, Albuquerque, NM 87192 USA. RP Carlsten, BE (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM bcarlsten@lani.gov; srussell@lanl.gov; earley@lani.gov; fkrawczyk@lani.gov; jpotter@jpaw.com; mdsfer@netvista.net; humphries@fieldp.com NR 13 TC 47 Z9 58 U1 1 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 85 EP 93 DI 10.1109/TPS.2004.841172 PN 1 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 898IZ UT WOS:000227071800011 ER PT J AU Rosocha, LA AF Rosocha, LA TI Nonthermal plasma applications to the environment: Gaseous electronics and power conditioning SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE air pollution; chemistry; plasmas; pulse generation ID ATMOSPHERIC-PRESSURE; DISCHARGE; REMEDIATION AB For nearly two decades, interest in gas-phase pollution control has greatly increased, arising from a greater respect for the environment, more attention to the effects of pollution, and a larger body of regulations and laws. Nonthermal plasma (NTP) technology shows promise for destroying pollutants in gas streams and cleaning contaminated surfaces, using plasma-generated reactive species (e.g., free radicals). NTPs can generate both oxidative and reductive radicals, showing promise for treating a variety of pollutants, sometimes simultaneously decomposing multiple species. In this paper, some applications of NTP processing for the environment, associated discharge physics and plasma chemistry, and power conditioning systems for driving the NTP reactors will be discussed. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rosocha, LA (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. EM rosocha@lanl.gov NR 32 TC 34 Z9 39 U1 1 U2 13 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 129 EP 137 DI 10.1109/TPS.2004.841800 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 898JP UT WOS:000227073400004 ER PT J AU Anders, A AF Anders, A TI Time-dependence of ion charge state distributions of vacuum arcs: An interpretation involving atoms and charge exchange collisions SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE charge exchange collisions; ion charge states; vacuum arcs ID MOLECULAR-DYNAMICS SIMULATIONS; MAGNETIC-FIELD; PLASMAS; CATHODE; VAPOR; PARAMETERS; DEPOSITION; SURFACES; CU AB Experimentally observed charge state distributions are known to be higher at the beginning of each arc discharge. Until know, this has been attributed to cathode surface effects in terms of changes in temperature, chemical composition, and spot mode. Here it is shown that the initial decay of charge states of cathodic arc plasmas may be at least in part due to charge exchange collisions of ions with neutrals. Neutrals gradually fill the discharge volume, and therefore, the effect of charge exchange shows delayed onset after arc initiation. Besides desorbed gases, sources of neutrals may include evaporated atoms from macroparticles and still-hot craters of previously active are spots. More importantly, atoms are also produced by energetic condensation of the cathodic arc plasma. Self-sputtering is significant, and additionally, ions have a low sticking probability when impacting at oblique angle of incidence. Estimates show that the characteristic time for filling the discharge volume agrees well with the charge state decay time, and the likelihood of charge exchange is reasonably large to be taken into account. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Anders, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Anders, Andre/B-8580-2009 OI Anders, Andre/0000-0002-5313-6505 NR 28 TC 21 Z9 22 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 2005 VL 33 IS 1 BP 205 EP 209 DI 10.1109/TPS.2004.841804 PN 2 PG 5 WC Physics, Fluids & Plasmas SC Physics GA 898JP UT WOS:000227073400014 ER PT J AU Yue, M Schlueter, R AF Yue, M Schlueter, R TI Robust control designs for multiple bifurcations SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article DE interarea oscillation; local oscillation; multiple bifurcations; overlapping bifurcation subsystem; mu-synthesis design ID POWER-SYSTEMS; DAMPING CONTROLLER AB A multiple bifurcation phenomena is observed in a two-area example power system. A local bifurcation and an inter-area bifurcation develop because of the multiple bifurcation parameter changes. The dynamic behaviors of the bifurcating system are complex due to the overlapping of the two different bifurcation subsystems and are shown to be difficult to control. The double bifurcations are studied in this paper and in order to stabilize them, three kinds of p-synthesis robust controls are designed: 1) P-synthesis power system stabilizer (MPSS); 2) mu-synthesis SVC control (MSVC); and 3) a mixed MPSS/MSVC control. Based on the bifurcation subsystem analysis, the measurement signals and locations of the controls are selected. The control performances and the RGA matrix information of three kind of controls are compared. The conclusions are given according to the analysis and time simulation results. C1 Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA. Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA. RP Yue, M (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA. EM yuemeng@bnl.gov; schluete@egr.msu.edu NR 18 TC 5 Z9 5 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD FEB PY 2005 VL 20 IS 1 BP 301 EP 311 DI 10.1109/TPWRS.2004.841245 PG 11 WC Engineering, Electrical & Electronic SC Engineering GA 893QB UT WOS:000226733200037 ER PT J AU Yue, M Schlueter, R AF Yue, M Schlueter, R TI Nonlinear effects of a robust control design SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Letter DE MPSS; normal form; second interaction index ID POWER-SYSTEMS; VECTOR-FIELDS AB The nonlinear effects of a robust mu-synthesis power system stabilizer (MPSS) using a bifurcation subsystem-based control design methodology is studied in this paper. A normal form representation of the nonlinear power system model is introduced such that the nonlinear model can be approximated up to the second order. An MPSS is designed using a bifurcation subsystem-based control design methodology, and the second-order interaction indices of the system with MPSS and conventional excitation control are calculated. The analysis of the nonlinear effects shows that the MPSS becomes dominant in dynamics by replacing the inertial dynamics that were dominant in the original system. C1 Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA. RP Yue, M (reprint author), Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. EM yuemeng@bnl.gov; schluete@egr.msu.edu NR 6 TC 2 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD FEB PY 2005 VL 20 IS 1 BP 508 EP 510 DI 10.1109/TPWRS.2004.841155 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA 893QB UT WOS:000226733200063 ER PT J AU Lee, D Santella, ML Anderson, IM Pharr, GM AF Lee, D Santella, ML Anderson, IM Pharr, GM TI Thermal aging effects on the microstructure and short-term oxidation behavior of a cast Ni3Al alloy SO INTERMETALLICS LA English DT Article DE nickel alummides; based on Ni3Al; oxidation; thermal stability; phase identification; casting; microstructure ID ADDITIONS; CHROMIUM AB Specimens of the castable, nickel aluminide alloy IC221M were annealed in still air at 900 degreesC to examine the effects of oxidation and thermal aging on its microstructure. The alloy, which is comprised primarily of a gamma-gamma' mixture but also contains a lower melting gamma + Ni5Zr eutectic, is used in applications that require casting. The as-cast microstructure is dendritic and exhibits microsegregation of the alloying elements. Microstructures of as-cast specimens annealed for periods up to 16,600 h were examined using scanning electron microscopy and energy dispersive X-ray spectroscopy with spectrum imaging. Although the material partially homogenizes with aging time, approximately 3 vol% of the gamma + Ni5Zr eutectic remains after 16,600 h, and there is a tendency for the eutectic colonies to spherodize. Oxidation products were identified using X-ray diffraction and energy dispersive X-ray spectroscopy. During the initial stages of oxidation, the oxide is predominantly NiO with small amounts of Cr2O3, ZrO2, NiCr2O4, and theta-Al2O3. Initial oxidation occurs primarily in the interdendritic regions of the microstructure. With further aging, the predominant surface oxides become NiO and NiAl2O4, with a continuous film of alpha-Al2O3 forming immediately beneath them. Although these oxides are constrained to the near surface region, other oxides penetrate to depths greater than 10 times that of the continuous surface oxide, facilitated by oxidation of the gamma+Ni5Zr interdendritic eutectic. These oxides appear in the microstructure as long, thin spikes of ZrO2 Surrounded by a sheath of Al2O3. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Pharr, GM (reprint author), Univ Tennessee, Dept Mat Sci & Engn, 425 Dougherty Hall, Knoxville, TN 37996 USA. EM pharr@utk.edu RI Lee, Dongyun/D-2469-2012 NR 18 TC 16 Z9 17 U1 0 U2 5 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0966-9795 EI 1879-0216 J9 INTERMETALLICS JI Intermetallics PD FEB PY 2005 VL 13 IS 2 BP 187 EP 196 DI 10.1016/j.intermet.2004.07.046 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA 876QZ UT WOS:000225513600010 ER PT J AU Evans, G Greif, R Siebers, D Tieszen, S AF Evans, G Greif, R Siebers, D Tieszen, S TI Turbulent mixed convection from a large, high temperature, vertical flat surface SO INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW LA English DT Article DE turbulent mixed convection; RANS; v(2)-f; k-epsilon; vertical flat plate ID BACKWARD-FACING STEP; NATURAL-CONVECTION; BOUNDARY-LAYER; HEAT-TRANSFER; PLATE; FLOW; MODEL AB Turbulent mixed convection heat transfer at high temperatures and large length scales is an important and seldom studied phenomenon that can represent a significant part of the overall heat transfer in applications ranging from solar central receivers to objects in fires. This work is part of a study to validate turbulence models for predicting heat transfer to or from surfaces at large temperature differences and large length scales. Here, turbulent, three-dimensional, mixed convection heat transfer in air from a large (3m square) vertical flat surface at high temperatures is studied using two RANS turbulence models: a standard k-epsilon, model and the (v(2)) over bar -f model. Predictions for three cases spanning the range of the experiment (Siebers, D.L., Schwind, R.G., Moffat, R.F. 1982. Experimental mixed convection from a large, vertical plate in a horizontal flow. Paper MC13, vol. 3, Proc. 7th Int. Heat Transfer Conf.. Munich; Siebers, D.L., 1983. Experimental mixed convection heat transfer from a large, vertical surface in a horizontal flow. PhD thesis. Stanford University) from forced (Gr(H)/Re-L(2) = 0.18) to mixed (Gr(H)/Re-L(2) = 3.06) to natural (Gr(H)/Re-L(2) = infinity) convection are compared with data. The results show a decrease in the heat transfer coefficient as Gr(H)/Re-L(2) is increased from 0.18 to 3.06, for a free-stream velocity of 4.4m/s. In the natural convection case, the experimental heat transfer coefficient is approximately constant in the fully turbulent region, whereas the calculated heat transfer coefficients show a slight increase with height. For the three cases studied, the calculated and experimental heat transfer coefficients agree to within 5-35% over most of the surface with the (v(2)) over bar -f model results showing better agreement with the data. Calculated temperature and velocity profiles show good agreement with the data. (C) 2004 Elsevier Inc. All rights reserved. C1 Sandia Natl Labs, Livermore, CA 94551 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Evans, G (reprint author), Sandia Natl Labs, POB 969, Livermore, CA 94551 USA. EM evans@sandia.gov NR 28 TC 10 Z9 10 U1 0 U2 7 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0142-727X J9 INT J HEAT FLUID FL JI Int. J. Heat Fluid Flow PD FEB PY 2005 VL 26 IS 1 BP 1 EP 11 DI 10.1016/j.ijheatfluidflow.2004.07.001 PG 11 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA 890VW UT WOS:000226540200001 ER PT J AU Cowell, AJ Stanney, KM AF Cowell, AJ Stanney, KM TI Manipulation of non-verbal interaction style and demographic embodiment to increase anthropomorphic computer character credibility SO INTERNATIONAL JOURNAL OF HUMAN-COMPUTER STUDIES LA English DT Article DE anthropomorphic interfaces; interface agents; non-verbal behavior ID PERFORMANCE-APPRAISAL; STEREOTYPES; AGE; EXPRESSION; BEHAVIOR; CONTEXT; TRUST; SMILE; GAZE AB For years, people have sought more natural means of communicating with their computers. Many have suggested that interaction with a computer should be as easy as interacting with other people, taking advantage of the multimodal nature of human communication. While users should, in theory, gravitate to such anthropomorphic embodiments, quite the contrary has been experienced; users generally have been dissatisfied and abandoned their use. This suggests a disconnect between factors that make human-human communication engaging and those used by designers to support human-agent interaction. This paper discusses a set of empirical studies that attempted to replicate human-human non-verbal behaviour. The focus revolved around behaviours that portray a credible facade, thereby helping embodied conversational agents (ECAs) to form a successful cooperative dyad with users. Based on a review of the non-verbal literature, a framework was created that identified trustworthy and credible non-verbal behaviours across five areas and formed design guidelines for character interaction. The design suggestions for those areas emanating from the facial region were experimentally supported but there was no concordant increase in perceived trust when bodily regions (posture, gesture) were added. In addition, in examining the importance of demographic elements in embodiment, it was found that users prefer to interact with characters that match their ethnicity and are young looking. There was no significant preference for gender. The implications of these results, as well as other interesting consequences are discussed. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Cent Florida, Dept Ind Engn, Orlando, FL 32816 USA. RP Cowell, AJ (reprint author), Pacific NW Natl Lab, MSIN K7-28,250 Gage Blvd,Apt 2126,POB 999, Richland, WA 99352 USA. EM andrew@pnl.gov; stanney@mail.ucf.edu NR 71 TC 23 Z9 23 U1 2 U2 6 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 1071-5819 J9 INT J HUM-COMPUT ST JI Int. J. Hum.-Comput. Stud. PD FEB PY 2005 VL 62 IS 2 BP 281 EP 306 DI 10.1016/j.ijhcs.2004.11.008 PG 26 WC Computer Science, Cybernetics; Ergonomics; Psychology, Multidisciplinary SC Computer Science; Engineering; Psychology GA 904NW UT WOS:000227506000009 ER PT J AU Jacobs, JM Monroe, ME Qin, WJ Shen, YF Anderson, GA Smith, RD AF Jacobs, JM Monroe, ME Qin, WJ Shen, YF Anderson, GA Smith, RD TI Ultra-sensitive, high throughput and quantitative proteomics measurements SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY LA English DT Article; Proceedings Paper CT Symposium on Mass Spectrometry of Biopolymers - From Model Systems to Ribosomes CY MAR, 2004 CL Anaheim, CA DE AMT; proteomic measurements; LC-MS ID TANDEM MASS-SPECTROMETRY; ION-CYCLOTRON RESONANCE; ELECTRON-CAPTURE DISSOCIATION; PROTEIN IDENTIFICATION TECHNOLOGY; CATALYZED O-16-TO-O-18 EXCHANGE; PHASE LIQUID-CHROMATOGRAPHY; HUMAN PLASMA PROTEOME; LOW-FEMTOMOLE LEVEL; COMPLEX-MIXTURES; SEQUENCE INFORMATION AB We describe the broad basis and application of an approach for very high throughput, ultra-sensitive, and quantitative proteomic measurements based upon the use of ultra-high performance separations and mass spectrometry (MS). An overview of the accurate mass and time (AMT) tag approach and a description of the incorporated data analysis pipeline necessary for efficient proteomic studies are presented. AdC, junct technologies, including stable-isotope labeling methodologies and improvements in the utilization of liquid chromatography (LC)-MS peak intensity information for quantitative purposes are also discussed. Related areas include the use of automated sample handling for improving analysis reproducibility, methods for using information from the separation for more confident peptide peak identification. and the utilization of smaller diameter capillary columns having lower volumetric flow rates to increase electrospray ionization efficiency and a flow, for more predictable and quantitative results. The developments are illustrated in the context of studies of complex biological systems. (C) 2004 Elsevier B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99354 USA. RP Smith, RD (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99354 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 85 TC 14 Z9 14 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1387-3806 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. PD FEB 1 PY 2005 VL 240 IS 3 BP 195 EP 212 DI 10.1016/j.ijms.2004.09.024 PG 18 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA 890VY UT WOS:000226540400004 ER PT J AU Boyukata, M Guvenc, ZB Ozcelik, S Durmus, P Jellinek, J AF Boyukata, M Guvenc, ZB Ozcelik, S Durmus, P Jellinek, J TI Reaction dynamics of Ni(n) (n=19 and 20) with D(2): Dependence on cluster size, temperature and initial rovibrational states of the molecule SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C LA English DT Article DE nickel clusters; structure; reactivity; molecule; MD simulations; deuterium molecule; chemisorption; dissociation ID DISSOCIATION DYNAMICS; NI(111) SURFACES; PALLADIUM CLUSTERS; NICKEL CLUSTERS; METAL-CLUSTERS; H-2; HYDROGEN; D2; SYSTEMS; DEUTERIUM AB The Ni(n)(n = 19, 20) + D2(v, j) collision systems have been studied to investigate the dependence of cluster reactivity on the cluster temperature and the initial rovibrational states of the molecule using quasiclassical molecular dynamics simulations. The clusters are described by an embedded atom potential, whereas the interaction between the molecule and the cluster is modeled by a LEPS (London-Eyring-Polani-Sato) potential energy function. Reaction (dissociative adsorption) cross-sections are computed as functions of the collision energy for different initial rovibrational states of the molecule and for different temperatures of the clusters. Rovibrational, temperature and size-dependent rate constants are also presented, and the results are compared with earlier studies. Initial vibrational excitation of the molecule increases the reaction cross-section more efficiently than the initial rotational excitation. The reaction cross-sections strongly depend on the collision energies below 0.1 eV. C1 Erciyes Univ, Dept Phys, TR-66100 Yozgat, Turkey. Cankaya Univ, Dept Elect & Commun Engn, TR-06530 Ankara, Turkey. Gazi Univ, Dept Phys, TR-06500 Ankara, Turkey. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Boyukata, M (reprint author), Erciyes Univ, Dept Phys, TR-66100 Yozgat, Turkey. EM boyukata@erciyes.edu.tr; guvenc@cankaya.edu.tr RI Ozcelik, Suleyman/J-6494-2014 OI Ozcelik, Suleyman/0000-0002-3761-3711 NR 35 TC 18 Z9 19 U1 1 U2 5 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0129-1831 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C PD FEB PY 2005 VL 16 IS 2 BP 295 EP 308 DI 10.1142/S0129183105007108 PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 933QQ UT WOS:000229648400008 ER PT J AU Ormand, WE AF Ormand, WE TI Nuclear physics with statistics SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article; Proceedings Paper CT International Conference on Blueprints for the Nucleus CY MAY 17-22, 2004 CL Istanbul, TURKEY DE nuclear structure; level density; shell model; Lanczos ID LEVEL DENSITIES; SPIN AB Properties of shell model Hamiltonians, and in particular the tri-diagonal matrices obtained with the Lanczos procedure are exploited to determine the density of states and to estimate the ground-state energies. It will be shown that with a few parameters that are adjusted to the moments up to fourth order of the Hamiltonian, one can model the resultant tri-diagonal matrices. An estimate of the ground state energy can quickly be obtained from the modeled matrices, and the density of states for the full matrix can quickly be obtained using the WKB approximation. The accuracy of the ground state is dependent on high moments, six and greater. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Ormand, WE (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. EM ormand1@llnl.gov NR 17 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD FEB PY 2005 VL 14 IS 1 BP 67 EP 74 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 909SO UT WOS:000227881200009 ER PT J AU Navratil, P AF Navratil, P TI Ab initio nuclear structure and nuclear reactions in light nuclei SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article; Proceedings Paper CT International Conference on Blueprints for the Nucleus CY MAY 17-22, 2004 CL Istanbul, TURKEY DE Shell model; forces in hadronic systems and effective interactions; nucleon-nucleon interactions; direct reactions; spectroscopic factors ID SHELL-MODEL CALCULATIONS; MONTE-CARLO CALCULATIONS; ART. NO. 014001; 3-NUCLEON FORCE; 1P SHELL; ENERGY; C-12 AB There has been significant progress in the ab initio approaches to the structure of light nuclei. One such method is the ab initio no-core shell model (NCSM). Starting from the realistic two- and three-nucleon interactions, this method can predict the low-lying levels in p-shell nuclei. It is a challenging task to extend the ab initio methods to describe nuclear reactions. In this contribution, we present a brief overview of the NCSM with examples of recent applications as well as the first steps taken toward nuclear reaction applications. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Lawrence Livermore Natl Lab, L-414,POB 808, Livermore, CA 94551 USA. EM navratil1@llnl.gov NR 31 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 EI 1793-6608 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD FEB PY 2005 VL 14 IS 1 BP 85 EP 93 DI 10.1142/S0218301305002801 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 909SO UT WOS:000227881200011 ER PT J AU Stetcu, I Barrett, BR Navratil, P Johnson, CW AF Stetcu, I Barrett, BR Navratil, P Johnson, CW TI Electromagnetic transitions with effective operators SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article; Proceedings Paper CT International Conference on Blueprints for the Nucleus CY MAY 17-22, 2004 CL Istanbul, TURKEY DE Shell model; electromagnetic transitions; nucleon-nucleon interaction; effective operators ID MONTE-CARLO CALCULATIONS; INITIO SHELL-MODEL; 3-NUCLEON FORCE; LIGHT-NUCLEI; ENERGY AB In the no-core shell model formalism we compute effective one- and two-body operators, using the Lee-Suzuki procedure within the two-body cluster approximation. We evaluate the validity of the latter through calculations in reduced model spaces. In particular, we test the results for the two-body system and find that indeed the effective operators in the reduced space reproduce the expectation values or transition strengths computed in the full space. On the other hand, the renormalization for operators in the case of Li-6 is very weak, suggesting the need for higher-body clusters in computing the effective interaction. C1 Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. San Diego State Univ, Dept Phys, San Diego, CA 92182 USA. RP Univ Arizona, Dept Phys, POB 210081, Tucson, AZ 85721 USA. NR 25 TC 13 Z9 13 U1 0 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 EI 1793-6608 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD FEB PY 2005 VL 14 IS 1 BP 95 EP 103 DI 10.1142/S0218301305002813 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 909SO UT WOS:000227881200012 ER PT J AU Ginocchio, JN AF Ginocchio, JN TI Pseudospin symmetry and the nucleon-nucleon interaction SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS LA English DT Article; Proceedings Paper CT International Conference on Blueprints for the Nucleus CY MAY 17-22, 2004 CL Istanbul, TURKEY DE pseudospin symmetry; relativistic mean field; nucleon-nucleon interaction; QCD sum rules ID WAVE-FUNCTIONS; SCATTERING; TRANSITIONS; SPIN AB Pseudospin symmetry is an approximate relativistic symmetry of the nucleus as demonstrated by experimental data. This symmetry follows from the fact that the vector and scalar potentials of nucleons moving in a relativistic mean field are approximately equal in magnitude and opposite in sign. QCD sum rules in nuclear matter support this conclusion. Such an observation suggests a fundamental reason for pseudospin symmetry. We review the status of pseudospin symmetry conservation in the nucleon-nucleon interaction. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Ginocchio, JN (reprint author), Los Alamos Natl Lab, Div Theoret, MS B283, Los Alamos, NM 87545 USA. EM gino@lanl.gov NR 16 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-3013 J9 INT J MOD PHYS E JI Int. J. Mod. Phys. E-Nucl. Phys. PD FEB PY 2005 VL 14 IS 1 BP 105 EP 110 DI 10.1142/S0218301305002825 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 909SO UT WOS:000227881200013 ER PT J AU Zheng, X Ryan, A Patel, N Klemons, S Hansson, A Shih, WCJ Lin, Y Huberman, E Chang, RL Conney, AH AF Zheng, X Ryan, A Patel, N Klemons, S Hansson, A Shih, WCJ Lin, Y Huberman, E Chang, RL Conney, AH TI Synergistic stimulatory effect of 12-O-tetradecanoylphorbol-13-acetate and capsaicin on macrophage differentiation in HL-60 and HL-525 human myeloid leukemia cells SO INTERNATIONAL JOURNAL OF ONCOLOGY LA English DT Article ID PROTEIN-KINASE-C; TRANS-RETINOIC ACID; PHORBOL ESTER; MONOCYTIC DIFFERENTIATION; TUMOR PROMOTERS; DOWN-REGULATION; INDUCTION; EXPRESSION; APOPTOSIS; UCN-01 AB Our previous studies demonstrated that 12-O-tetradecanoylphorbol-13-acetate (TPA) had pharmacological activity for the treatment of myeloid leukemia patients. In the present study, we investigated the effects of TPA alone or in combination with capsaicin (8-methyl-N-vanillyl-6-nonenamide) on growth and differentiation in myeloid leukemia HL-60 cells and in a TPA-resistant HL-60 variant cell line termed HL-525. Treatment of HL-60 cells with TPA (0.16-1.6 nM) for 48 It resulted in concentration-dependent growth inhibition and cell differentiation (via the macrophage pathway). Capsaicin (5-50 muM) inhibited the growth of HL-60 cells in a concentration-dependent manner. Treatment of HL-60 cells with capsaicin alone only resulted in a small increase in the number of differentiated cells but treatment of the cells with TPA in combination with capsaicin synergistically increased differentiation. Moreover, inhibitors of protein kinase C (PKC), 7-hydroxystaurosporin (UCN-01; 100 nM) and chelerythrine (0.5 muM), significantly decreased HL-60 cell differentiation induced by the combination of TPA and capsaicin. These results suggest that PKC may be involved in HL-60 cell differentiation induced by TPA in combination with capsaicin. Capsaicin alone caused a very small increase in differentiation in the TPA-resistant HL-525 cells. However, treatment of HL-525 cells with combinations of TPA (0.16 nM) and capsaicin (10-50 muM) caused a strong synergistic increase in differentiation. Results from the present study suggest that a combination of TPA and capsaicin may improve the therapeutic efficacy of TPA and overcome resistance to TPA in sonic myeloid leukemia patients. C1 Rutgers State Univ, Susan Lehman Cullman Lab Canc Res, Dept Biol Chem, Ernest Mario Sch Pharm, Piscataway, NJ 08854 USA. Univ Med & Dent New Jersey, Sch Publ Hlth, Div Biometr, New Brunswick, NJ 08903 USA. Argonne Natl Lab, Biochip Technol Ctr, Argonne, IL 60439 USA. Canc Inst New Jersey, New Brunswick, NJ 08903 USA. RP Conney, AH (reprint author), Rutgers State Univ, Susan Lehman Cullman Lab Canc Res, Dept Biol Chem, Ernest Mario Sch Pharm, Piscataway, NJ 08854 USA. EM aconney@rci.rutgers.edu FU NCI NIH HHS [CA 80826, CA 092268] NR 42 TC 5 Z9 5 U1 0 U2 0 PU PROFESSOR D A SPANDIDOS PI ATHENS PA 1, S MERKOURI ST, EDITORIAL OFFICE,, ATHENS 116 35, GREECE SN 1019-6439 J9 INT J ONCOL JI Int. J. Oncol. PD FEB PY 2005 VL 26 IS 2 BP 441 EP 448 PG 8 WC Oncology SC Oncology GA 889ZM UT WOS:000226481500017 PM 15645129 ER PT J AU Williams, TO AF Williams, TO TI A three-dimensional, higher-order, elasticity-based micromechanics model SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article DE micromechanics; elasticity-based cell model (ECM); particulate composites; homogenization; method of cells; periodicity; elasticity ID METAL-MATRIX COMPOSITES AB The three-dimensional (3D) version of a new homogenization theory [A Two-Dimensional, Higher-Order, Elasticity-Based Micromechanics Model, in print] is presented. The 3D theory utilizes a higher-order, elasticity-based cell model (ECM) analysis for a periodic array of 3D unit cells. The unit cell is discretized into eight subregions or subcells. The displacement field within each subcell is approximated by a (truncated) eigenfunction expansion of up to fifth order. The governing equations are developed by satisfying the pointwise governing equations of geometrically linear continuum mechanics exactly up through the given order of the subcell displacement fields. The specified governing equations are valid for any type of constitutive model used to describe the behavior of the material in a subcell. The specialization of the theory to lower orders and to two-dimcinsions (2D) and to the exact one-dimensional (ID) theory is discussed. Since the proposed 3D homogenization theory correctly reduces to both 2D and I D the validation process applied to the 2D theory [A Two-Dimensional, Higher-Order, Ellasticity-Based Micromechanics Model, in print] directly applies to the current formulation. Additional comparisons of the predicted responses obtained from the 3D ECM theory with existing published results are conducted. The good agreement obtained shows that the current theory represents a viable 3D homogenization tool. The improved agreement between the current theory results and published results as compared to the comparison of the MOC results and the published results is due to the correct incorporation of the coupling effects between the local fields. Additional results showing the convergence behavior of the average fields as a function of the order of the analysis is presented. These results show that the 1st order theory may not accurately predict the local averages but that consistent and converged behavior is obtained using the higher order ECM theories. The proposed theory represents the necessary theoretical foundations for the development of exact homogenization solutions of generalized, three-dimensional microstructures. (C) 2004 Elsevier Ltd. All rights reserved. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Williams, TO (reprint author), Los Alamos Natl Lab, Div Theoret, T-3, Los Alamos, NM 87545 USA. EM oakhill@lanl.gov NR 18 TC 7 Z9 7 U1 2 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD FEB PY 2005 VL 42 IS 3-4 BP 971 EP 1007 DI 10.1016/j.ijsolstr.2004.06.056 PG 37 WC Mechanics SC Mechanics GA 874QD UT WOS:000225364000010 ER PT J AU Williams, TO AF Williams, TO TI A two-dimensional, higher-order, elasticity-based micromechanics model SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article DE micromechanics; elasticity-based cell model (ECM); continuous fiber composites; homogenization; method of cells; periodicity; elasticity ID METAL-MATRIX COMPOSITES AB A new, two-dimensional (2D) homogenization theory is proposed. The theory utilizes a higher-order, elasticity-based cell model (ECM) analysis. The material microstructure is modeled as a 2D periodic array of unit cells where each unit cell is discretized into four subregions (or subcells). The analysis utilizes a (truncated) eigenfunction expansion of up to fifth order for the displacement field in each subcell. The governing equations for the theory are developed by satisfying the pointwise governing equations of geometrically linear continuum mechanics exactly up through an order consistent with the order of the subcell displacement field. The formulation is carried out independently of any specified constitutive models for the behavior of the individual phases (in the sense that the general governing equations hold for any constitutive model). The fifth order theory is subsequently specialized to a third order theory. Additionally, the higher order analyzes reduce to a theory equivalent to the original 2D method of cells (MOC) theory when all higher order terms are eliminated. The proposed 2D theory is the companion theory to an equivalent 3D theory [T.O. Williams, A three-dimensional, higher-order, elasticity-based micromechanics model, Int. J. Solids Struc., in press]. Comparison of the predicted bulk and local responses with published results indicates that the theory accurately predicts both types of responses. The high degree of agreement between the current theory results and published results is due to the correct incorporation of the coupling effects between the local fields. The proposed theory represents the necessary theoretical foundations for the development of exact homogenization solutions of generalized, two-dimensional microstructures. (C) 2004 Elsevier Ltd. All rights reserved. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Williams, TO (reprint author), Los Alamos Natl Lab, Div Theoret, T-3,MA B216, Los Alamos, NM 87545 USA. EM oakhill@lanl.gov NR 19 TC 13 Z9 13 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD FEB PY 2005 VL 42 IS 3-4 BP 1009 EP 1038 DI 10.1016/j.ijsolstr.2004.06.057 PG 30 WC Mechanics SC Mechanics GA 874QD UT WOS:000225364000011 ER PT J AU Fialho, P Hansen, ADA Honrath, RE AF Fialho, P Hansen, ADA Honrath, RE TI Absorption coefficients by aerosols in remote areas: a new approach to decouple dust and black carbon absorption coefficients using seven-wavelength Aethalometer data SO JOURNAL OF AEROSOL SCIENCE LA English DT Article DE absorption coefficient; black carbon; iron oxides; Sahara dust; aerosol exponents; PICO-NARE; seven-wavelength Aethalometer ID ATMOSPHERIC DUST; OPTICAL-PROPERTIES; SOUTH-POLE; PARTICLES; MONOXIDE AB We present a new approach to decouple aerosol absorption coefficients due to iron oxide in Sahara dust from those due to black carbon (BC) particles. Absorption coefficients, sigma(aerosol)(lambda, t), were measured at the summit of Pico mountain (2225 m ASL) in the Azores Islands using a seven-wavelength Aethalometer. Measurements between 27th July and lst August, 2001, are analyzed here. Variations in aerosol absorption coefficients were uncorrelated to those of CO during the latter part of this period, suggesting the presence of non-combustion-derived aerosol, apparently African dust. To differentiate between BC and other absorbing particles, we analyzed the wavelength dependence Of sigma(aerosol)(lambda, t) and determined a best-fit exponent during the later period equal to -2.9 +/- 0.2, somewhat lower than previously reported for soil dust. Using this method, it is possible to estimate the aerosol absorption due to BC and that due to soil dust separately through the full period analyzed. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Acores, Dept Ciencias Agrarias, Grp Quim & Fis Atmosfera, PT-9701850 Terra Cha, Portugal. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Michigan Technol Univ, Dept Civil & Environm Engn, Houghton, MI 49931 USA. RP Fialho, P (reprint author), Univ Acores, Dept Ciencias Agrarias, Grp Quim & Fis Atmosfera, PT-9701850 Terra Cha, Portugal. EM paulo.fialho@mail.angra.uac.pt OI Fialho, Paulo/0000-0001-9137-3870 NR 27 TC 64 Z9 66 U1 2 U2 18 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0021-8502 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD FEB PY 2005 VL 36 IS 2 BP 267 EP 282 DI 10.1016/j.jaerosci.2004.09.004 PG 16 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 895TF UT WOS:000226885800007 ER PT J AU Jeong, IK Graf, MJ Heffner, RH AF Jeong, IK Graf, MJ Heffner, RH TI Effects of Bragg peak profiles and nanoparticle sizes on the real-space pair distribution function SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID X-RAY-DIFFRACTION; RIETVELD REFINEMENT; ORDER AB A study of the effects of Bragg peak profiles and nanoparticle size broadening on the real-space pair distribution function (PDF) is presented, using 'synthetic' powder diffraction data. Bragg peak profiles from both asymmetric time-of-flight (TOF) spallation neutron data and symmetric synchrotron X-ray data are considered. Due to their asymmetric peak profiles, the TOF data cause artificial shifts of the PDF peak positions towards higher pair distances. Coupled with this effect is a broadening of the PDF peak widths due to a Q-dependent spectrometer resolution, making reliable refinement of thermal parameters difficult. These effects become more pronounced as the Q resolution becomes worse. By contrast, the symmetric X-ray powder diffraction data do not cause a systematic shift of the PDF peak positions, and the broadening of the PDF peak widths has a relatively minor effect on the extraction of the thermal parameters. Finally, nanoparticle size broadening of the asymmetric neutron TOF powder diffraction data causes a shift of the PDF peak positions towards lower r values and smears the PDF intensities from one atomic shell to another. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Jeong, IK (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM jeong@lanl.gov NR 29 TC 3 Z9 3 U1 0 U2 9 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD FEB PY 2005 VL 38 BP 55 EP 61 DI 10.1107/S0021889804025841 PN 1 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 889AA UT WOS:000226414500004 ER PT J AU Snell, EH van der Woerd, MJ Miller, MD Deacon, AM AF Snell, EH van der Woerd, MJ Miller, MD Deacon, AM TI Finding a cold needle in a warm haystack: infrared imaging applied to locating cryocooled crystals in loops SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID STRUCTURAL GENOMICS; MACROMOLECULAR CRYSTALLOGRAPHY; PROTEIN CRYSTALLOGRAPHY; DRUG DISCOVERY; BEAMLINE; SYSTEM; CRYOCRYSTALLOGRAPHY; FIP AB The use of infrared imaging to locate crystals mounted in cryoloops and cryopreserved in a nitrogen gas stream at 100 K is demonstrated. In the home laboratory, crystals are clearly seen in the infrared images with light transmitting through the sample while irradiating the crystal from behind, and with illumination from a direction perpendicular to the direction of view. The crystals transmit and reflect infrared radiation at different levels to the surrounding mother liquor and loop. Because of differences in contrast between crystals and their surrounding mother liquor, it is possible to identify the crystal position. At the synchrotron, with robotically mounted crystals, the small depth of field of the lens required the recording of multiple images at different focal points. Image processing techniques were then used to construct a clear image of the crystal. The resulting infrared images and intensity profiles show that infrared imaging can be a powerful complement to visual imaging in locating crystals in cryocooled loops. C1 NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA. Stanford Univ, JCSG, SSRL, Menlo Pk, CA 94025 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Snell, EH (reprint author), NASA, George C Marshall Space Flight Ctr, Code SD46, Huntsville, AL 35812 USA. EM eddie.snell@msfc.nasa.gov NR 23 TC 9 Z9 9 U1 0 U2 0 PU BLACKWELL MUNKSGAARD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD FEB PY 2005 VL 38 BP 69 EP 77 DI 10.1107/S0021889804027566 PN 1 PG 9 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 889AA UT WOS:000226414500006 ER PT J AU Ruland, W Smarsly, B AF Ruland, W Smarsly, B TI SAXS of self-assembled nanocomposite films with oriented two-dimensional cylinder arrays: an advanced method of evaluation SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID SMALL-ANGLE SCATTERING; 2-PHASE SYSTEMS; POROUS SILICA; THIN-FILMS; MODEL AB In a recent paper [Ruland & Smarsly ( 2002). J. Appl. Cryst. 35, 624 - 633], an advanced method for the evaluation of the small-angle X-ray scattering (SAXS) from oriented lamellar systems was presented. In the present work, a comparable method is developed for the study of oriented cylinder arrays. Basic differences between the two methods are found in the way in which the preferred orientation affects the intensity distribution. The method is applied to the SAXS of SiO2-surfactant nanocomposite films which contain highly oriented arrays of cylinders. It is shown that up to eight structural parameters can be obtained by this method which characterize size, imperfection and preferred orientation of the two-dimensional hexagonal lattice formed by the cylinders, the radius and the polydispersity of the cylinders, and the interface boundary. C1 Univ Marburg, Dept Chem, D-35032 Marburg, Germany. Univ Marburg, Ctr Mat Sci, D-35032 Marburg, Germany. Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Ruland, W (reprint author), Univ Marburg, Dept Chem, D-35032 Marburg, Germany. EM ruland@staff.uni-marburg.de RI Smarsly, Bernd/G-8514-2011 NR 18 TC 37 Z9 37 U1 1 U2 10 PU BLACKWELL MUNKSGAARD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD FEB PY 2005 VL 38 BP 78 EP 86 DI 10.1107/S0021889804027724 PN 1 PG 9 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 889AA UT WOS:000226414500007 ER PT J AU Brzustowicz, MR Brunger, AT AF Brzustowicz, MR Brunger, AT TI X-ray scattering from unilamellar lipid vesicles SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID DETECTOR; SANS; SAXS AB An improved small-angle X-ray scattering (SAXS) method for determining asymmetric lipid bilayer structure in unilamellar vesicles is presented. From scattering theory, analytic expressions are derived for the bilayer form factor over flat and spherical geometries, assuming the lipid bilayer electron density to be composed of a series of Gaussian shells. This is in contrast to both classic diffraction and Guinier hard-shell SAXS methods which, respectively, are capable only of ascertaining symmetric bilayer structure and limited-resolution asymmetric structure. Using model fitting and direct calculation of the form factor, using only one equation, an asymmetric electron density profile of the lipid vesicle is obtained with high accuracy, as well as the average radius. The analysis suggests that the inner leaflet of a unilamellar lipid vesicle is 'rougher' than the outer one. C1 Dept Cellular & Mol Physiol, Stanford, CA 94305 USA. Dept Neurol & Neurol Sci, Stanford, CA 94305 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA. Howard Hughes Med Inst, Coconut Grove, FL 33133 USA. RP Brunger, AT (reprint author), Dept Cellular & Mol Physiol, JH Clark Ctr Romm E300-C,318 Campus Dr, Stanford, CA 94305 USA. EM brunger@slac.stanford.edu NR 16 TC 40 Z9 40 U1 6 U2 25 PU BLACKWELL MUNKSGAARD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD FEB PY 2005 VL 38 BP 126 EP 131 DI 10.1107/S0021889804029206 PN 1 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 889AA UT WOS:000226414500014 ER PT J AU Grote, K Hubbard, S Harvey, J Rubin, Y AF Grote, K Hubbard, S Harvey, J Rubin, Y TI Evaluation of infiltration in layered pavements using surface GPR reflection techniques SO JOURNAL OF APPLIED GEOPHYSICS LA English DT Article DE ground penetrating radar; water content; pavement aggregates; reflection ID GROUND-PENETRATING RADAR; TIME-DOMAIN REFLECTOMETRY; SOIL-WATER CONTENT AB The bearing capacity of sub-asphalt soils, which is a critical parameter for assessing pavement conditions and guiding pavement maintenance, is greatly influenced by soil water content. In this study, ground-coupled ground penetrating radar (GPR) techniques were used to non-destructively monitor the volumetric water content in sub-asphalt aggregate layers during an extended infiltration experiment. Water was injected over a period of several months into two differently layered pavement test sections, one of which contained a sub-asphalt drainage layer. GPR travel time data were used to estimate the water content in each aggregate layer and the variations in water content with time, and GPR amplitude data were used to indicate areas of high water content immediately beneath the asphalt layer. The GPR data revealed significant variations in the water content of the aggregate layers in both the horizontal and vertical directions and over time. Comparison of the water content estimates from GPR travel time data and from gravimetric water content measurements showed that the difference between the two techniques was approximately 0.02 cm(3)/cm(3). These results suggest that GPR techniques can be used for accurate, non-invasive water content estimation in sub-asphalt aggregate layers and for assessing the efficacy of pavement drainage layers. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Wisconsin, Dept Geol, Eau Claire, WI 54702 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Davis, Davis, CA 95616 USA. RP Grote, K (reprint author), Univ Wisconsin, Dept Geol, 105 Garfield Ave, Eau Claire, WI 54702 USA. EM grotekr@uwec.edu; sshubbard@lbl.gov; jtharvey@ucdavis.edu; rubin@ce.berkeley.edu RI Hubbard, Susan/E-9508-2010 NR 40 TC 42 Z9 44 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-9851 J9 J APPL GEOPHYS JI J. Appl. Geophys. PD FEB PY 2005 VL 57 IS 2 BP 129 EP 153 DI 10.1016/j.jappgeo.2004.10.002 PG 25 WC Geosciences, Multidisciplinary; Mining & Mineral Processing SC Geology; Mining & Mineral Processing GA 897OL UT WOS:000227014400005 ER PT J AU Abrams, BL Williams, L Bang, JS Holloway, PH AF Abrams, BL Williams, L Bang, JS Holloway, PH TI Thermal quenching of cathodoluminescence from ZnS : Ag,Cl powder phosphors SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FIELD EMISSION DISPLAYS; SULFIDE PHOSPHORS; DEGRADATION; TEMPERATURE AB Thermal quenching of cathodoluminescence (CL) was studied by incrementally increasing the temperature of a ZnS:Ag,Cl phosphor without exposure to a continuous electron beam and measuring the decreased CL intensity. A characteristic thermal quenching temperature of 150 degreesC with an activation energy (E-a) of 0.87 eV was measured. In addition to the reduced CL intensity, the spectra shifted to longer wavelengths and changed shape at elevated temperature due to band gap narrowing at high temperatures and to copper contamination from the heater stage. The CL spectral distribution and intensity were 100% recoverable upon cooling back to room temperature when the electron beam exposure was <1 C/cm(2). (C) 2005 American Institute of Physics. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA. RP Abrams, BL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM blabram@sandia.gov RI Abrams, Billie/C-1668-2012 NR 16 TC 6 Z9 6 U1 2 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033521 DI 10.1063/1.1847719 PG 4 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300027 ER PT J AU Carrier, P Wei, SH AF Carrier, P Wei, SH TI Theoretical study of the band-gap anomaly of InN SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FUNDAMENTAL OPTICAL-TRANSITIONS; ALLOYS 0.36-LESS-THAN-X-LESS-THAN-1; INDIUM NITRIDE; HEXAGONAL INN; INGAN ALLOYS; SEMICONDUCTORS; APPROXIMATION; LOCALIZATION; ABSORPTION; ENERGY AB Using a band-structure method that includes the correction to the band-gap error in the local-density approximation (LDA), we find that the band gap for InN is 0.8+/-0.1 eV, in good agreement with recent experimental data, but is much smaller than previous experimental value of similar to1.9 eV. The unusually small band gap for InN is explained in terms of the high electronegativity of nitrogen and, consequently, the small band-gap deformation potential of InN. The possible origin of the measured large band gaps is discussed in terms of the nonparabolicity of the bands, the Moss-Burstein shift, and the effect of oxygen. Based on the error analysis of our LDA-corrected calculations we have compiled the band-structure parameters for wurtzite AlN, GaN, and InN. (C) 2005 American Institute of Physics. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. EM suhuai_wei@nrel.gov NR 43 TC 89 Z9 91 U1 1 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033707 DI 10.1063/1.1849425 PG 5 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300042 ER PT J AU Hu, XB Wang, JY Teng, B Loong, CK Grimsditch, M AF Hu, XB Wang, JY Teng, B Loong, CK Grimsditch, M TI Raman study of phonons in bismuth triborate BiB3O6 crystal SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NONLINEAR-OPTICAL CRYSTAL; TOP-SEEDED GROWTH; BORATE BIB3O6; SPECTRA AB A Raman-scattering study of the vibrational modes in a BiB3O6 crystal was conducted at room temperature. The numbers of external and internal modes obtained in experiment are consistent with the results of a group theoretical analysis. The Raman lines below similar to300 cm(-1) and from similar to300 to 1600 cm(-1) are assigned to the external modes of the lattice and internal vibrations of the BO3 and BO4 subunits of the BiB3O6 structure, respectively. (C) 2005 American Institute of Physics. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China. RP Loong, CK (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM ckloong@anl.gov NR 18 TC 13 Z9 13 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033501 DI 10.1063/1.1823573 PG 5 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300007 ER PT J AU Jacobsohn, LG Bennett, BL Cooke, DW Muenchausen, RE Nastasi, M AF Jacobsohn, LG Bennett, BL Cooke, DW Muenchausen, RE Nastasi, M TI The effects of ion irradiation on porous silicon photoluminescence SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPTICAL-PROPERTIES; QUANTUM DOTS; BLUE-SHIFT; LUMINESCENCE; RAMAN; SURFACE; HYDROGEN; SI; MICROCRYSTALLINE; SEMICONDUCTORS AB The effects of ion irradiation on porous Si (po-Si) photoluminescence (PL) are investigated to gain insight into the emission mechanism. Po-Si was obtained by standard electrochemical etching of p-doped Si(100) and the samples were aged for several weeks to achieve stability of the PL intensity. Specimens were progressively irradiated with H+, He+, or Ne++ ions followed by PL measurements. PL spectra were obtained as a function of the displacement per atom (DPA) parameter up to a DPA level of similar to10(-2), which was sufficient to nearly extinguish PL. The quenching behavior showed a strong dependence on the chemical nature of the implanted species. Within experimental error, the quenching efficiency was equivalent for He+ and Ne++ irradiations, but was considerably higher for H+ irradiation. Channeling spectrometry showed the efficiency to be correlated with the self-recovery of defects generated during irradiation. The observed PL quenching is associated with the creation of nonradiative recombination sites within the band gap, but not with Si nanostructure amorphization and/or surface oxygen removal. Significant recovery of quenched PL occurs over a period of 120 days for specimens that are stored in air, but not for samples that are stored in vacuum. These results demonstrate the importance and complexity of surface oxidation on the po-Si luminescence mechanism. (C) 2005 American Institute of Physics. C1 Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Jacobsohn, LG (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, MST-8 G755, Los Alamos, NM 87545 USA. EM lgjacob@lanl.gov OI Jacobsohn, Luiz/0000-0001-8991-3903 NR 39 TC 13 Z9 14 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033528 DI 10.1063/1.1849434 PG 5 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300034 ER PT J AU Lu, JG Rozgonyi, G Schonecker, A Gutjahr, A Liu, ZX AF Lu, JG Rozgonyi, G Schonecker, A Gutjahr, A Liu, ZX TI Impact of oxygen on carbon precipitation in polycrystalline ribbon silicon SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CZOCHRALSKI SILICON; DIFFUSION; ABSORPTION; CRYSTALS AB This article reports experimental evidence for the effect of oxygen on carbon precipitation in polycrystalline ribbon silicon. Four sets of wafers subject to various heat treatments have been examined by infrared spectroscopy. It is found that carbon precipitation in an oxygen-containing wafer consists of two distinct steps, namely, an initial rapid oxygen-carbon coprecipitation in the very first hour annealing, followed by slow precipitation during subsequent prolonged annealing. A high oxygen content enhances carbon precipitation throughout the two steps. It is shown that the formation of interstitial carbon in the presence of excess silicon self-interstitials generated during oxygen precipitation plays an important role in increasing the carbon precipitation rate in the first hour annealing. Because of the absence of interstitial injection during the following slow precipitation process, the enhancement effect of oxygen can only arise from an increase in precipitation sites. It is proposed that the oxygen-carbon coprecipitates formed in the very first hour annealing provide sites for continuous carbon precipitation. This explains why carbon impurities precipitate faster in a high oxygen-containing wafer, even after removal of all the interstitial oxygen from the silicon matrix. (C) 2005 American Institute of Physics. C1 N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA. Energy Res Ctr Netherlands, NL-1755 ZG Petten, Netherlands. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Lu, JG (reprint author), N Carolina State Univ, Dept Mat Sci & Engn, Box 7907, Raleigh, NC 27695 USA. EM jlu7@ncsu.edu NR 22 TC 5 Z9 5 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033509 DI 10.1063/1.1847699 PG 4 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300015 ER PT J AU Nachimuthu, P Thevuthasan, S Shutthanandan, V Adams, EM Weber, WJ Begg, BD Shuh, DK Lindle, DW Gullikson, EM Perera, RCC AF Nachimuthu, P Thevuthasan, S Shutthanandan, V Adams, EM Weber, WJ Begg, BD Shuh, DK Lindle, DW Gullikson, EM Perera, RCC TI Near-edge x-ray absorption fine-structure study of ion-beam-induced phase transformation in Gd-2(Ti1-yZry)(2)O-7 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS; PYROCHLORES; IMMOBILIZATION; A(2)B(2)O(7); TRANSITION; PLUTONIUM; DISORDER; GD2TI2O7; OXIDES AB The structural and electronic properties of Gd-2(Ti1-yZry)(2)O-7 (y=0-1) pyrochlores following a 2.0-MeV Au2+ ion-beam irradiation (similar to5.0x10(14) Au2+/cm(2)) have been investigated by Ti 2p and O 1s near-edge x-ray absorption fine structure (NEXAFS). The irradiation of Gd-2(Ti1-yZry)(2)O-7 leads to the phase transformation from the ordered pyrochlore structure (Fd3m) to the defect fluorite structure (Fm3m) regardless of Zr concentration. Irradiated Gd-2(Ti1-yZry)(2)O-7 with yless than or equal to0.5 are amorphous, although significant short-range order is present. Contrasting to this behavior, compositions with ygreater than or equal to0.75 retain crystallinity in the defect fluorite structure following irradiation. The local structures of Zr4+ in the irradiated Gd-2(Ti1-yZry)(2)O-7 with ygreater than or equal to0.75 determined by NEXAFS are the same as in the cubic fluorite-structured yttria-stabilized zirconia (Y-ZrO2), thereby providing conclusive evidence for the phase transformation. The TiO6 octahedra present in Gd-2(Ti1-yZry)(2)O-7 are completely modified by ion-beam irradiation to TiOx polyhedra, and the Ti coordination is increased to eight with longer Ti-O bond distances. The similarity between cation sites and the degree of disorder in Gd2Zr2O7 facilitate the rearrangement and relaxation of Gd, Zr, and O ions/defects. This inhibits amorphization during the ion-beam-induced phase transition to the radiation-resistant defect fluorite structure, which is in contrast to the ordered Gd2Ti2O7. (C) 2005 American Institute of Physics. C1 Univ Nevada, Dept Chem, Las Vegas, NV 89154 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia. RP Nachimuthu, P (reprint author), Univ Nevada, Dept Chem, Las Vegas, NV 89154 USA. EM PNachimuthu@lbl.gov RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 26 TC 14 Z9 14 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 033518 DI 10.1063/1.1840097 PG 5 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300024 ER PT J AU Perkins, CL Lee, SH Li, XN Asher, SE Coutts, TJ AF Perkins, CL Lee, SH Li, XN Asher, SE Coutts, TJ TI Identification of nitrogen chemical states in N-doped ZnO via x-ray photoelectron spectroscopy SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID P-TYPE ZNO; THIN-FILMS; MOLECULAR NITROGEN; EPITAXIAL-GROWTH; SINGLE-CRYSTALS; ADSORPTION; DEPOSITION; SURFACES; IMPLANTATION; TEMPERATURE AB Nitrogen-doped films of ZnO grown by two methods, metalorganic chemical vapor deposition (MOCVD) and reactive sputtering, were studied with x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS). Systematic differences in the N chemical states were observed between films grown by sputtering and MOCVD: only two N chemical states were observed in films grown by reactive sputtering, whereas four N chemical states were observed in MOCVD films. To aid in the assignment of the N chemical states, photoemission data from the polycrystalline films were compared with data taken on N-2(+)-implanted Zn metal and N-2(+)-implanted ZnO. High-resolution core level spectra of the N 1s region indicated that nitrogen can occupy at least four different chemical environments in ZnO; these include the N-O acceptor, the double donor (N-2)(O), and two carbon-nitrogen species. Valence band spectra indicate that the Fermi energy of all films studied was near the conduction band minimum, implying that the films remained n-type after nitrogen doping. Analysis of the relative amounts of acceptors and donors identified by XPS in the sputter-grown films provides clues as to why only a small percentage of incorporated nitrogen is found to contribute to carriers, and points toward possible paths to higher quality ZnO:N films. (C) 2005 American Institute of Physics. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Perkins, CL (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd,MS 3215, Golden, CO 80401 USA. EM craig_perkins@nrel.gov RI Lee, Sehee/A-5989-2011 NR 41 TC 192 Z9 201 U1 8 U2 102 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 2005 VL 97 IS 3 AR 034907 DI 10.1063/1.1847728 PG 7 WC Physics, Applied SC Physics GA 894GG UT WOS:000226778300092 ER PT J AU Sugita, T Sato, K Komistek, RD Mahfouz, MR Maeda, I Sano, T AF Sugita, T Sato, K Komistek, RD Mahfouz, MR Maeda, I Sano, T TI In vivo determination of knee kinematics for Japanese subjects having either a low contact stress rotating platform or an anteroposterior glide total knee arthroplasty SO JOURNAL OF ARTHROPLASTY LA English DT Article DE total knee arthroplasty; in vivo; fluoroscopy; kinematics ID CONDYLAR LIFT-OFF; FOLLOW-UP; INVITRO; REPLACEMENT; PROSTHESIS; SYSTEM AB The objective of this study was to work with a consecutive series of patients having Hospital for Special Surgery scores higher than 90 to evaluate kinematic patterns, under in vivo conditions, for 20 Japanese subjects implanted with 2 different mobile-bearing (MB) total knee arthroplasties (TKAs). Femorotibial contact paths for the medial and lateral condyles were then determined using a computer-automated model-fitting technique. This present study has shown that kinematic patterns for subjects having 2 different MB TKA designs differed but were not statistically different. Subjects implanted with a rotating platform (RP) MB TKA experienced minimal anteroposterior (AP) motion and larger axial rotation (RP). Subjects implanted with an anterior glide MB TKA experienced both femoral rotation and femoral translation (AP glide). There was minimal variability in the kinematic patterns for subjects implanted with an RP, whereas subjects implanted with an AP glide experienced more variable kinematic patterns. (C) 2005 Elsevier Inc. All rights reserved. C1 Univ Tennessee, Dept Biomed Engn, Knoxville, TN 37996 USA. Tohoku Univ, Dept Orthoped, Sendai, Miyagi 980, Japan. Tohoku Rosai Hosp, Dept Orthopaed, Sendai, Miyagi, Japan. Oak Ridge Natl Lab, Bioengn Lab, Oak Ridge, TN USA. RP Komistek, RD (reprint author), Univ Tennessee, Dept Biomed Engn, 313 Perkins Hall, Knoxville, TN 37996 USA. NR 39 TC 10 Z9 10 U1 0 U2 1 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI PHILADELPHIA PA CURTIS CENTER, INDEPENDENCE SQUARE WEST, PHILADELPHIA, PA 19106-3399 USA SN 0883-5403 J9 J ARTHROPLASTY JI J. Arthroplast. PD FEB PY 2005 VL 20 IS 2 BP 154 EP 161 DI 10.1016/j.arth.2004.10.008 PG 8 WC Orthopedics SC Orthopedics GA 900YP UT WOS:000227250500004 PM 15902853 ER PT J AU Huang, G Qing, F Lechno-Yossef, S Wojciuch, E Wolk, CP Kaneko, T Tabata, S AF Huang, G Qing, F Lechno-Yossef, S Wojciuch, E Wolk, CP Kaneko, T Tabata, S TI Clustered genes required for the synthesis of heterocyst envelope polysaccharide in Anabaena sp strain PCC 7120 SO JOURNAL OF BACTERIOLOGY LA English DT Article ID BLUE-GREEN-ALGA; AEROBIC NITROGEN-FIXATION; CYANOBACTERIUM-ANABAENA; ESCHERICHIA-COLI; DEVELOPMENTAL REGULATION; SPORE ENVELOPES; CLONING VECTORS; PCC 7120; EXPRESSION; COMPLEMENTATION AB As demonstrated with alr2835 (hepA) and alr2834 (hepC) mutants, heterocysts of Anabaena sp. strain PCC 7120, a filamentous cyanobacterium, must have an envelope polysaccharide layer (the Hep(+) phenotype) to fix dinitrogen in an oxygen-containing milieu (the Fox(+) phenotype). Transpositions presumptively responsible for a Fox(-) phenotype were localized in open reading frames (ORFs) near hepA and hepC. A mutation in each of nine of these ORFs was complemented by a clone bearing only that single, intact ORF. Heterocysts of the nine mutants were found to lack an envelope polysaccharide layer. Complementation of mutations in alr2832 and alr2840 may have resulted from recombination. However, alr2825, alr2827, alr2831, alr2833, alr2837, air2839, and alr2841, like hepA and hepC, are required for a Hep(+) Fox(+) phenotype. C1 Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. Kazusa DNA Res Inst, Chiba, Japan. RP Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. EM wolk@msu.edu RI FAN, QING/G-6356-2012 NR 45 TC 46 Z9 48 U1 2 U2 5 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0021-9193 EI 1098-5530 J9 J BACTERIOL JI J. Bacteriol. PD FEB PY 2005 VL 187 IS 3 BP 1114 EP 1123 DI 10.1128/JB.187.3.1114-1123.2005 PG 10 WC Microbiology SC Microbiology GA 893FR UT WOS:000226705200031 PM 15659688 ER PT J AU Maltsev, N Glass, EM Ovchinnikova, G Gu, ZL AF Maltsev, N Glass, EM Ovchinnikova, G Gu, ZL TI Molecular mechanisms involved in robustness of yeast central metabolism against null mutations SO JOURNAL OF BIOCHEMISTRY LA English DT Article DE enzymes; gene duplication; isozymes; phenotype; subunits ID SACCHAROMYCES-CEREVISIAE; PHOSPHOGLUCOSE ISOMERASE; GENE-EXPRESSION; PHOSPHATE; SEQUENCE; CARBON; DUPLICATION; SYNTHASE; MUTANTS AB Adaptive strategies employed by the yeast Saccharomyces cerevisiae provide robustness and adaptability of its central metabolism. Since central metabolism in yeast has been well studied at the enzymatic and genetic levels, it represents an excellent system for evaluating the relative roles of duplicate genes and alternative metabolic pathways as possible mechanisms for the stability of central metabolism against null mutations. Yeast appears to employ a variety of mechanisms to ensure functional robustness of its central metabolism. Uninterrupted flow of energy and precursor metabolites through the pathways of central metabolism via glycolysis (EMP), pentose phosphate shunt (PPS), and the tricarboxylic acid (TCA) cycle are ensured by a variety of adaptive mechanisms. One of the most significant mechanisms appears to be gene duplication events that have produced a number of isozymes functioning under variable environmental and physiological conditions. Alternative pathways represent another important mechanism for increasing the robustness of the system. The robustness of the pathways of central metabolism is apparently higher than that of the other parts of metabolism, because of its exceptional importance to the organism's vitality. The proportion of duplicated viable genes also is substantially larger in central metabolism than that in a pool of other metabolic genes. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. Univ Chicago, Dept Ecol & Evolut, Chicago, IL 60637 USA. RP Maltsev, N (reprint author), Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM maltsev@mcs.anl.gov NR 34 TC 11 Z9 12 U1 0 U2 2 PU JAPANESE BIOCHEMICAL SOC PI TOKYO PA ISHIKAWA BLDG-3F, 25-16 HONGO-5-CHOME, BUNKYO-KU, TOKYO, 113, JAPAN SN 0021-924X J9 J BIOCHEM JI J. Biochem. PD FEB PY 2005 VL 137 IS 2 BP 177 EP 187 DI 10.1093/jb/mvi017 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 911YV UT WOS:000228045200010 PM 15749832 ER PT J AU Komistek, RD AF Komistek, RD TI Special issue on knee mechanics SO JOURNAL OF BIOMECHANICS LA English DT Editorial Material C1 Univ Tennessee, Oak Ridge Natl Lab, Knoxville, TN 37996 USA. RP Komistek, RD (reprint author), Univ Tennessee, Oak Ridge Natl Lab, 313 Perkins Hall, Knoxville, TN 37996 USA. EM rkomiste@utk.edu NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-9290 J9 J BIOMECH JI J. Biomech. PD FEB PY 2005 VL 38 IS 2 BP 195 EP 195 DI 10.1016/j.jbiomech.2004.11.010 PG 1 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA 889SP UT WOS:000226463100001 ER PT J AU Komistek, RD Kane, TR Mahfouz, M Ochoa, JA Dennis, DA AF Komistek, RD Kane, TR Mahfouz, M Ochoa, JA Dennis, DA TI Knee mechanics: a review of past and present techniques to determine in vivo loads SO JOURNAL OF BIOMECHANICS LA English DT Review DE mathematical model; fluoroscopy; dynamics; kinetics; mechanics ID MUSCLE FORCE ESTIMATIONS; OPTIMIZATION TECHNIQUES; LOWER-EXTREMITY; FEMORAL REPLACEMENTS; MATHEMATICAL-MODEL; JOINT FORCES; WALKING; HIP; SIMULATION; TELEMETRY AB This review article evaluates various techniques that have been used to determine in vivo loads in the human knee. Two main techniques that have been used are telemetry, which is an experimental approach, and mathematical modeling, which is a theoretical approach. Telemetric analyses have previously been used to determine the in vivo loading of the human hip and more recently evaluated in the determination of in vivo knee loads. Mathematical modeling approaches can be categorized two ways; those that use optimization techniques to solve an indeterminate system and those that utilize a reduction method that minimizes the number of unknowns, keeping the system solvable as the number of equations of motion are equal to the number of unknown quantities. More recently, we have developed an approach that relies fully on the use of in vivo data from fluoroscopy, CT scanning, magnetic resonant imaging and a revised motion analysis technique that involves only two markers on each rigid body. A review of all techniques revealed a wide range of forces at the human knee, ranging from 1.9 to 7.2 times body weight during level walking. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Tennessee, Dept Biomed Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Stanford Univ, Stanford, CA 94305 USA. Rocky Mtn Musculoskeletal Res Lab, Denver, CO USA. A Johnson & Johnson Co, DePuy, Warsaw, IA USA. RP Komistek, RD (reprint author), Univ Tennessee, Dept Biomed Engn, 301 Perkins Hall, Knoxville, TN 37996 USA. EM rkomistek@aol.com OI Ochoa, Jorge/0000-0003-1992-8143 NR 60 TC 60 Z9 64 U1 1 U2 12 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-9290 J9 J BIOMECH JI J. Biomech. PD FEB PY 2005 VL 38 IS 2 BP 215 EP 228 DI 10.1016/j.jbiomech.2004.02.041 PG 14 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA 889SP UT WOS:000226463100004 PM 15598448 ER PT J AU Mahfouz, MR Hoff, WA Komistek, RD Dennis, DA AF Mahfouz, MR Hoff, WA Komistek, RD Dennis, DA TI Effect of segmentation errors on 3D-to-2D registration of implant models in X-ray images SO JOURNAL OF BIOMECHANICS LA English DT Article DE 3-D to 2-D registration; TKA knee implants; X-ray fluoroscopy; segmentation; pose estimation ID KNEE REPLACEMENT KINEMATICS; FLUOROSCOPY; SNAKES AB In many biomedical applications, it is desirable to estimate the three-dimensional (3D) position and orientation (pose) of a metallic rigid object (such as a knee or hip implant) from its projection in a two-dimensional (2D) X-ray image. If the geometry of the object is known, as well as the details of the image formation process, then the pose of the object with respect to the sensor can be determined. A common method for 3D-to-2D registration is to first segment the silhouette contour from the X-ray image; that is, identify all points in the image that belong to the 2D silhouette and not to the background. This segmentation step is then followed by a search for the 3D pose that will best match the observed contour with a predicted contour. Although the silhouette of a metallic object is often clearly visible in an X-ray image, adjacent tissue and occlusions can make the exact location of the silhouette contour difficult to determine in places. Occlusion can occur when another object (such as another implant component) partially blocks the view of the object of interest. In this paper, we argue that common methods for segmentation can produce errors in the location of the 2D contour, and hence errors in the resulting 3D estimate of the pose. We show, on a typical fluoroscopy image of a knee implant component, that interactive and automatic methods for segmentation result in segmented contours that vary significantly. We show how the variability in the 2D contours (quantified by two different metrics) corresponds to variability in the 3D poses. Finally, we illustrate how traditional segmentation methods can fail completely in the (not uncommon) cases of images with occlusion. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Tennessee, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. Colorado Sch Mines, Golden, CO 80401 USA. RP Mahfouz, MR (reprint author), Univ Tennessee, 313 Perkins Hall, Knoxville, TN 37996 USA. EM mmahfouz@rmmrl.org NR 22 TC 30 Z9 33 U1 0 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-9290 J9 J BIOMECH JI J. Biomech. PD FEB PY 2005 VL 38 IS 2 BP 229 EP 239 DI 10.1016/j.jbiomech.2004.02.025 PG 11 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA 889SP UT WOS:000226463100005 PM 15598449 ER PT J AU Dennis, DA Mahfouz, MR Komistek, RD Hoff, W AF Dennis, DA Mahfouz, MR Komistek, RD Hoff, W TI In vivo determination of normal and anterior cruciate ligament-deficient knee kinematics SO JOURNAL OF BIOMECHANICS LA English DT Article DE kinematics; helical axis; registration; anterior cruciate ligament deficient; fluoroscopy; normal knee ID REPLACEMENT KINEMATICS; FLUOROSCOPIC ANALYSIS; IMAGE REGISTRATION; ARTHROPLASTY; JOINT; ROTATION; INVITRO; MOTION; RECONSTRUCTION; TRANSLATION AB The objective of the current study was to use fluoroscopy to accurately determine the three-dimensional (3D), in vivo, weight-bearing kinematics of 10 normal and five anterior cruciate ligament deficient (ACLD) knees. Patient-specific bone models were derived from computed tomography (CT) data. 3D computer bone models of each subject's femur, tibia, and fibula were recreated from the CT 3D bone density data. Using a model-based 3D-to-2D imaging technique registered CT images were precisely fit onto fluoroscopic images, the full six degrees of freedom motion of the bones was measured from the images. The computer-generated 3D models of each subject's femur and tibia were precisely registered to the 2D digital fluoroscopic images using an optimization algorithm that automatically adjusts the pose of the model at various flexion/extension angles. Each subject performed a weight-bearing deep knee bend while under dynamic fluoroscopic surveillance. All 10 normal knees experienced posterior femoral translation of the lateral condyle and minimal change in position of the medial condyle with progressive knee flexion. The average amount of posterior femoral translation of the lateral condyle was 21.07 mm, whereas the average medial condyle translation was 1.94 mm, in the posterior direction. In contrast, all five ACLD knees experienced considerable change in the position of the medial condyle. The average amount of posterior femoral translation of the lateral condyle was 17.00 mm, while the medial condyle translation was 4.65 mm, in the posterior direction. In addition, the helical axis of motion was determined between maximum flexion and extension. A considerable difference was found between the center of rotation locations of the normal and ACLD subjects, with ACLD subjects exhibiting substantially higher variance in kinematic patterns. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Tennessee, Dept Biomed Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Colorado Sch Mines, Div Engn, Golden, CO 80401 USA. RP Mahfouz, MR (reprint author), Univ Tennessee, Dept Biomed Engn, 313 Perkins Hall, Knoxville, TN 37996 USA. EM mmahfouz@rmmrl.org NR 62 TC 131 Z9 136 U1 0 U2 13 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0021-9290 J9 J BIOMECH JI J. Biomech. PD FEB PY 2005 VL 38 IS 2 BP 241 EP 253 DI 10.1016/j.jbiomech.2004.02.042 PG 13 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA 889SP UT WOS:000226463100006 PM 15598450 ER PT J AU Parrinello, S Coppe, JP Krtolica, A Campisi, J AF Parrinello, S Coppe, JP Krtolica, A Campisi, J TI Stromal-epithelial interactions in aging and cancer: senescent fibroblasts alter epithelial cell differentiation SO JOURNAL OF CELL SCIENCE LA English DT Article DE epithelial to mesenchyme transition (EMT); beta-casein; mammary epithelial cells; matrix metalloproteinase-3 (MMP-3); morphogenesis; tissue structure and function ID HEPATOCYTE GROWTH-FACTOR; MAMMARY-GLAND; IN-VIVO; ENDOTHELIAL-CELLS; DNA-DAMAGE; LIFE-SPAN; EXPRESSION; CULTURE; AGE; METALLOPROTEINASE AB Cellular senescence suppresses cancer by arresting cells at risk of malignant tumorigenesis. However, senescent cells also secrete molecules that can stimulate premalignant cells to proliferate and form tumors, suggesting the senescence response is antagonistically pleiotropic. We show that premalignant mammary epithelial cells exposed to senescent human fibroblasts in mice irreversibly lose differentiated properties, become invasive and undergo full malignant transformation. Moreover, using cultured mouse or human fibroblasts and non-malignant breast epithelial cells, we show that senescent fibroblasts disrupt epithelial alveolar morphogenesis, functional differentiation and branching morphogenesis. Furthermore, we identify MMP-3 as the major factor responsible for the effects of senescent fibroblasts on branching morphogenesis. Our findings support the idea that senescent cells contribute to age-related pathology, including cancer, and describe a new property of senescent fibroblasts - the ability to alter epithelial differentiation - that might also explain the loss of tissue function and organization that is a hallmark of aging. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. Buck Inst Age Res, Novato, CA 94945 USA. RP Campisi, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, 1000 Centennial Dr, Berkeley, CA 94720 USA. EM jcampisi@lbl.gov FU NCI NIH HHS [Z01 BC010658]; NIA NIH HHS [AG09909, R37 AG009909] NR 48 TC 271 Z9 285 U1 0 U2 12 PU COMPANY OF BIOLOGISTS LTD PI CAMBRIDGE PA BIDDER BUILDING CAMBRIDGE COMMERCIAL PARK COWLEY RD, CAMBRIDGE CB4 4DL, CAMBS, ENGLAND SN 0021-9533 J9 J CELL SCI JI J. Cell Sci. PD FEB 1 PY 2005 VL 118 IS 3 BP 485 EP 496 DI 10.1242/jcs.01635 PG 12 WC Cell Biology SC Cell Biology GA 901AY UT WOS:000227256600003 PM 15657080 ER PT J AU Alexandrova, AN Boldyrev, AI Zhai, HJ Wang, LS AF Alexandrova, AN Boldyrev, AI Zhai, HJ Wang, LS TI Photoelectron spectroscopy and ab initio study of the doubly antiaromatic B-6(2-) dianion in the LiB6- cluster SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COLLISION-INDUCED DISSOCIATION; TRANSITION-METAL CLUSTERS; DENSITY-FUNCTIONAL THEORY; MOLECULAR-ORBITAL METHODS; CATIONIC BORON CLUSTERS; ELECTRONIC-STRUCTURE; GENETIC ALGORITHM; B-13(+) CLUSTERS; WAVE-FUNCTIONS; BARE BORON AB A metal-boron mixed cluster LiB6- was produced and characterized by photoelectron spectroscopy and ab initio calculations. A number of electronic transitions were observed and used to compare with theoretical calculations. An extensive search for the global minimum of LiB6- was carried out via an ab initio genetic algorithm technique. The pyramidal C-2v ((1)A(1)) molecule was found to be the most stable at all levels of theory. The nearest low-lying isomer was found to be a triplet C-2 (B-3) structure, 9.2 kcal/mol higher in energy. Comparison of calculated detachment transitions from LiB6- and the experimental photoelectron spectra confirmed the C-2v pyramidal global minimum structure. Natural population calculation revealed that LiB6- is a charge-transfer complex, Li+B62-, in which Li+ and B-6(2-) interact in a primarily ionic manner. Analyses of the molecular orbitals and chemical bonding of B-6(2-) showed that the planar cluster is twofold (pi- and sigma-) antiaromatic, which can be viewed as the fusion of two aromatic B-3(-) units. (C) 2005 American Institute of Physics. C1 Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Natl Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Boldyrev, AI (reprint author), Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. EM boldyrev@cc.usu.edu; ls.wang@pnl.gov RI Boldyrev, Alexander/C-5940-2009 OI Boldyrev, Alexander/0000-0002-8277-3669 NR 72 TC 63 Z9 63 U1 1 U2 11 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 2005 VL 122 IS 5 AR 054313 DI 10.1063/1.1839575 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 895RG UT WOS:000226880100026 PM 15740328 ER PT J AU Bragg, AE Verlet, JRR Kammrath, A Cheshnovsky, O Neumark, DM AF Bragg, AE Verlet, JRR Kammrath, A Cheshnovsky, O Neumark, DM TI Time-resolved intraband electronic relaxation dynamics of Hg-n(-) clusters (n=7-13,15,18) excited at 1.0 eV SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MERCURY CLUSTERS; PHOTOELECTRON-SPECTROSCOPY; SIZE DEPENDENCE; METAL-CLUSTERS; ULTRAFAST; STATE; NANOPARTICLES; TRANSITION; EXCITATION; BEHAVIOR AB Time-resolved photoelectron imaging has been used to study the relaxation dynamics of small Hg-n(-) clusters (n = 7-13, 15, 18) following intraband electronic excitation at 1250 nm (1.0 eV). This study furthers our previous investigation of single electron, intraband relaxation dynamics in Hg-n(-) clusters at 790 nm by exploring the dynamics of smaller clusters (n = 7-10), as well as those of larger clusters (n = 11-13, 15, 18) at a lower excitation energy. We measure relaxation time scales of 2-9 ps, two to three times faster than seen previously after 790 nm excitation of Hg-n(-), n = 11-18. These results, along with size-dependent trends in the absorption cross-section and photoelectron angular distribution anisotropy, suggest significant evolution of the cluster anion electronic structure in the size range studied here. Furthermore, the smallest clusters studied here exhibit 35-45 cm(-1) oscillations in pump-probe signal at earliest temporal delays that are interpreted as early coherent nuclear motion on the excited potential energy surfaces of these clusters. Evidence for evaporation of one or two Hg atoms is seen on a time scale of tens of picoseconds. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. Tel Aviv Univ, Sackler Fac Exact Sci, Sch Chem, IL-69978 Tel Aviv, Israel. RP Neumark, DM (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. EM dneumark@berkeley.edu RI Neumark, Daniel/B-9551-2009; Verlet, Jan/G-5940-2012 OI Neumark, Daniel/0000-0002-3762-9473; Verlet, Jan/0000-0002-9480-432X NR 44 TC 24 Z9 24 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 2005 VL 122 IS 5 AR 054314 DI 10.1063/1.1828042 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 895RG UT WOS:000226880100027 PM 15740329 ER PT J AU Duan, YH Halley, JW Curtiss, L Redfern, P AF Duan, YH Halley, JW Curtiss, L Redfern, P TI Mechanisms of lithium transport in amorphous polyethylene oxide SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; POLY(ETHYLENE OXIDE); POLYMER ELECTROLYTES; COMPUTER-SIMULATION; STRUCTURAL RELAXATION; COMPLEX ELECTROLYTE; SYSTEM; MODEL; CONDUCTIVITY; IODIDE AB We report calculations using a previously reported model of lithium perchlorate in polyethylene oxide in order to understand the mechanism of lithium transport in these systems. Using an algorithm suggested by Voter, we find results for the diffusion rate which are quite close to experimental values. By analysis of the individual events in which large lithium motions occur during short times, we find that no single type of rearrangement of the lithium environment characterizes these events. We estimate the free energies of the lithium ion as a function of position during these events by calculation of potentials of mean force and thus derive an approximate map of the free energy as a function of lithium position during these events. The results are consistent with a Marcus-like picture in which the system slowly climbs a free energy barrier dominated by rearrangement of the polymer around the lithium ions, after which the lithium moves very quickly to a new position. Reducing the torsion forces in the model causes the diffusion rates to increase. (C) 2005 American Institute of Physics. C1 Univ Minnesota, Dept Phys & Astron, Minneapolis, MN 55455 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Duan, YH (reprint author), Univ Minnesota, Dept Phys & Astron, Minneapolis, MN 55455 USA. NR 46 TC 27 Z9 27 U1 1 U2 15 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 2005 VL 122 IS 5 AR 054702 DI 10.1063/1.1839555 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 895RG UT WOS:000226880100039 PM 15740341 ER PT J AU Strachan, A Kober, EM van Duin, ACT Oxgaard, J Goddard, WA AF Strachan, A Kober, EM van Duin, ACT Oxgaard, J Goddard, WA TI Thermal decomposition of RDX from reactive molecular dynamics SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FORCE-FIELD; SIMULATION; HYDROCARBONS; DETONATIONS; SILICON; OXIDE; GAS; HMX AB We use the recently developed reactive force field ReaxFF with molecular dynamics to study thermal induced chemistry in RDX [cyclic-[CH2N(NO2)](3)] at various temperatures and densities. We find that the time evolution of the potential energy can be described reasonably well with a single exponential function from which we obtain an overall characteristic time of decomposition that increases with decreasing density and shows an Arrhenius temperature dependence. These characteristic timescales are in reasonable quantitative agreement with experimental measurements in a similar energetic material, HMX [cyclic-[CH2N(NO2)](4)]. Our simulations show that the equilibrium population of CO and CO2 (as well as their time evolution) depend strongly of density: at low density almost all carbon atoms form CO molecules; as the density increases larger aggregates of carbon appear leading to a C deficient gas phase and the appearance of CO2 molecules. The equilibrium populations of N-2 and H2O are more insensitive with respect to density and form in the early stages of the decomposition process with similar timescales. (C) 2005 American Institute of Physics. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. CALTECH, Mat & Proc Simulat Ctr, Beckman Inst 137 74, Pasadena, CA 91125 USA. RP Strachan, A (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM strachan@lanl.gov RI Oxgaard, Jonas/A-1196-2007 NR 33 TC 183 Z9 196 U1 13 U2 100 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 2005 VL 122 IS 5 AR 054502 DI 10.1063/1.1831277 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 895RG UT WOS:000226880100032 PM 15740334 ER PT J AU Zhai, HJ Wang, LS AF Zhai, HJ Wang, LS TI Chemisorption sites of CO on small gold clusters and transitions from chemisorption to physisorption SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CARBON-MONOXIDE ADSORPTION; CATALYTIC-ACTIVITY; PHOTOELECTRON-SPECTROSCOPY; SUPPORTED GOLD; AU CLUSTERS; OXIDATION; SIZE; OXYGEN; O-2; NANOPARTICLES AB Gold clusters adsorbed with CO, Au-m(CO)(n)(-) (m=2-5; n=0-7), were studied by photoelectron spectroscopy (PES). The first few CO adsorptions were observed to induce significant redshifts to the PES spectra relative to pure gold clusters. For each Au cluster, a critical CO number (n(c)) was observed, beyond which the PES spectra of Au-m(CO)(n)(-) change very little with increasing n. n(c) was shown to correspond exactly to the available low coordination apex sites in each Au cluster. CO first chemisorbs to these sites and additional CO then only physisorbs to the chemisorption-sautrated Au-m(CO)(n)(-) complexes. (C) 2005 American Institute of Physics. C1 Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Natl Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Wang, LS (reprint author), Washington State Univ, Dept Phys, Richland, WA 99352 USA. EM ls.wang@pnl.gov NR 35 TC 81 Z9 81 U1 2 U2 20 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 2005 VL 122 IS 5 AR 051101 DI 10.1063/1.1850091 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 895RG UT WOS:000226880100001 PM 15740303 ER PT J AU Hakin, AW Liu, JL Erickson, K Munoz, JV Rard, JA AF Hakin, AW Liu, JL Erickson, K Munoz, JV Rard, JA TI Apparent molar volumes and apparent molar heat capacities of Pr(NO3)(3)(aq), Gd(NO3)(3)(aq), Ho(NO3)(3)(aq), and Y(NO3)(3)(aq) at T = (288.15, 298.15, 313.15, and 328.15) K and p = 0.1 MPa SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID EARTH ELECTROLYTE-SOLUTIONS; ISOPIESTIC DETERMINATION; ACTIVITY-COEFFICIENTS; TRANSPORT-PROPERTIES; P=0.1 MPA; THERMOCHEMICAL PROPERTIES; NITRATE SOLUTIONS; HIGH-PRESSURES; 25-DEGREES-C; STATE AB Relative densities and relative massic heat capacities have been measured for acidified solutions of Y(NO3)(3)(aq), Pr(NO3)(3)(aq), and Gd(NO3)(3)(aq) at T = (288.15, 298.15, 313.15, and 328.15) K and p = 0.1 MPa. In addition, relative densities and massic heat capacities have been measured at the same temperatures and pressure for Y(NO3)(3)(aq) and Ho(NO3)(3)(aq) solutions without excess acid (n.b. measurements at T = 328.15 K for Ho(NO3)(3)(aq) were not performed due to the limited volume of solution available). Apparent molar volumes and apparent molar heat capacities for the aqueous salt solutions have been calculated from the experimental apparent molar properties of the acidified solutions using Young's rule, whereas the apparent molar properties of the solutions without excess acid were calculated directly from the measured densities and massic heat capacities. The two sets of data for the Y(NO3)(3)(aq) systems provide a check of the internal consistency of the Young's rule approach we have utilised. The concentration dependences of the apparent molar volumes and heat capacities of the aqueous salt solutions have been modelled at each investigated temperature using the Pitzer ion interaction equations to yield apparent molar properties at infinite dilution. Complex formation within the aqueous rare earth nitrate systems is discussed qualitatively by probing the concentration dependence of apparent molar volumes and heat capacities. In spite of the complex formation in the aqueous rare earth nitrate systems, there is a high degree of self-consistency between the apparent molar volumes and heat capacities at infinite dilution reported in this manuscript and those previously reported for aqueous rare earth perchlorates. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Lethbridge, Dept Chem & Biochem, Lethbridge, AB T1K 3M4, Canada. Lawrence Livermore Natl Lab, Energy & Environm Directorate, Livermore, CA 94550 USA. RP Hakin, AW (reprint author), Univ Lethbridge, Dept Chem & Biochem, 4401 Univ Dr, Lethbridge, AB T1K 3M4, Canada. EM hakin@uleth.ca NR 29 TC 11 Z9 11 U1 0 U2 4 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD FEB PY 2005 VL 37 IS 2 BP 153 EP 167 DI 10.1016/j.jct.2004.08.010 PG 15 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA 894AU UT WOS:000226763000006 ER PT J AU Cherepy, NJ Shen, TH Esposito, AP Tillotson, TM AF Cherepy, NJ Shen, TH Esposito, AP Tillotson, TM TI Characterization of an effective cleaning procedure for aluminum alloys: surface enhanced Raman spectroscopy and zeta potential analysis SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article DE aluminum surfaces; metal cleaning; surface enhanced Raman spectroscopy; zeta potential AB We have developed a cleaning procedure for aluminum alloys for effective minimization of surface-adsorbed sub-micrometer particles and nonvolatile residue. The procedure consists of a phosphoric acid etch followed by an alkaline detergent wash. To better understand the mechanism whereby this procedure reduces surface contaminants, we characterized the aluminum surface as a function of cleaning step using surface enhanced Raman spectroscopy (SERS). SERS indicates that phosphoric acid etching re-establishes a surface oxide of different characteristics, including deposition of phosphate and increased hydration, while the subsequent alkaline detergent wash appears to remove the phosphate and modify the new surface oxide, possibly leading to a more compact surface oxide. We also studied the zeta potential of <5 mum pure aluminum and aluminum alloy 6061-T6 particles to determine how surface electrostatics may be affected during the cleaning process. The particles show a decrease in the magnitude of their zeta potential in the presence of detergent, and this effect is most pronounced for particles that have been etched with phosphoric acid. (C) 2004 Elsevier Inc. All rights reserved. C1 Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. RP Cherepy, NJ (reprint author), Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. EM cherepy1@llnl.gov RI Cherepy, Nerine/F-6176-2013 OI Cherepy, Nerine/0000-0001-8561-923X NR 17 TC 12 Z9 12 U1 0 U2 13 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD FEB 1 PY 2005 VL 282 IS 1 BP 80 EP 86 DI 10.1016/j.jcis.2004.08.064 PG 7 WC Chemistry, Physical SC Chemistry GA 882QR UT WOS:000225953900011 PM 15576083 ER PT J AU Gdanitz, RJ Black, GD Lansing, CS Palmer, BJ Schuchardt, KL AF Gdanitz, RJ Black, GD Lansing, CS Palmer, BJ Schuchardt, KL TI Registering the Amica electronic structure code in the extensible Computational Chemistry Environment SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article DE atomic and molecular physics; explicitly correlated wave functions; graphical user interfaced; problem solving environment; quanturn chemistry ID EXPLICITLY CORRELATED (R(12)-)MR-CI; UNITARY-GROUP APPROACH; MULTIREFERENCE CONFIGURATION-INTERACTION; HELIUM-DIMER HE-2; R(12)-MR-CI; SCHRODINGER-EQUATION; GROUND-STATE; 1ST-ROW ATOMS; CORRELATION CUSP; WAVE-FUNCTIONS AB We describe the integration and use of the Amica software package ("Atoms & Molecules In Chemical Accuracy") within the Extensible Computational Chemistry Environment (Ecce). Arnica is capable of accurately solving the electronic Schrodinger equation of small atoms and molecules using terms that are linear in the interelectronic distances, r(12) on multireference level of theory, but it requires expert knowledge to configure and execute its algorithms. Ecce is a comprehensive suite of tools that support the computational chemistry research processes of computation setup, execution, and analysis through a convenient graphical user interface. Additionally, Ecce was architected with mechanisms to integrate alternative electronic structure codes. The successful integration of Amica within Ecce validates the architecture of the latter and brings the high-accuracy capabilities of Arnica to a wider audience. (C) 2004 Wiley Periodicals, Inc. C1 N Carolina Agr & Tech State Univ, Dept Phys, Greensboro, NC 27411 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Gdanitz, RJ (reprint author), N Carolina Agr & Tech State Univ, Dept Phys, 101 Marteena Hall, Greensboro, NC 27411 USA. EM g-danitz@ncat.edu NR 61 TC 4 Z9 4 U1 0 U2 1 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD FEB PY 2005 VL 26 IS 3 BP 214 EP 225 DI 10.1002/jcc.20152 PG 12 WC Chemistry, Multidisciplinary SC Chemistry GA 891CF UT WOS:000226558200002 PM 15599951 ER PT J AU Hall, JA Mailloux, BJ Onstott, TC Scheibe, TD Fuller, ME Dong, H DeFlaun, MF AF Hall, JA Mailloux, BJ Onstott, TC Scheibe, TD Fuller, ME Dong, H DeFlaun, MF TI Physical versus chemical effects on bacterial and bromide transport as determined from on site sediment column pulse experiments SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article DE chemical effects; physical effects; bacterial transport; Br retardation ID ADHESION-DEFICIENT BACTERIA; FLUORESCENT STAINING METHOD; COASTAL-PLAIN AQUIFER; POROUS-MEDIA; INTACT CORES; SOUTH OYSTER; THEORETICAL PREDICTION; VIRUS TRANSPORT; IONIC-STRENGTH; SANDY AQUIFER AB Twenty-eight bacterial and Br transport experiments were performed in the field to determine the effects of physical and chemical heterogeneity of the aquifer sediment. The experiments were performed using groundwater from two field locations to examine the effects of groundwater chemistry on transport. Groundwater was extracted from multilevel samplers and pumped through 7-cm-long columns of intact sediment or repacked sieved and coated or uncoated sediment from the underlying aquifer. Two bacterial strains, Comamonas sp. DA001 and Paenibacillus polymyxa FER-02, were injected along with Br into the influent end of columns to examine the effect of cell morphology and cell surface properties on bacterial transport. The effects of column sediment grain size and mineral coatings coupled with groundwater geochemistry were also investigated. Significant irreversible attachment of DA001 was observed in the Fe oxyhydroxide-coated columns, but only in the suboxic groundwater where the concentrations of dissolved organic carbon (DOC) were ca. 1 ppm. In the oxic groundwater where DOC was ca. 8 ppm, little attachment of DA001 to the Fe oxyhydroxide-coated columns was observed. This indicates that DOC can significantly reduce bacterial attachment due electrostatic interactions. The larger and more negatively charged FER-02 displayed increasing attachment with decreasing grain size regardless of DOC concentration, and modeling of FER-02 attachment revealed that the presence of Fe and Al coatings on the sediment also promoted attachment. Finally, the presence of Al coatings and Al containing minerals appeared to significantly retard the Br tracer regardless of the concentration of DOC. These findings suggest that DOC in shallow oxic groundwater aquifers can significantly enhance the transport of bacteria by reducing attachment to Fe, Mn and Al oxyhydroxides. This effect appears to be profound for weakly and strongly charged hydrophilic bacteria and may contribute to differences in observations between laboratory experiments versus field-scale investigations particularly if the groundwater pH remains subneutral and Fe oxyhydroxide phases exist. These observation validate the novel approach taken in the experiments outlined here of performing laboratory-scale experiments on site to facilitate the use of fresh groundwater and thus be more representative of in situ groundwater conditions. (C) 2004 Elsevier B.V. All rights reserved. C1 Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. Miami Univ, Dept Geol, Oxford, OH 45056 USA. Envirogen Inc, Princeton Res Ctr, Lawrenceville, NJ 08648 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Hall, JA (reprint author), Carnegie Inst Washington, Geophys Lab, 5251 Broad Branch Rd NW, Washington, DC 20015 USA. EM j.hall@gl.ciw.edu RI Scheibe, Timothy/A-8788-2008 OI Scheibe, Timothy/0000-0002-8864-5772 NR 47 TC 18 Z9 18 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD FEB PY 2005 VL 76 IS 3-4 BP 295 EP 314 DI 10.1016/j.jconhyd.2004.11.003 PG 20 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA 900AZ UT WOS:000227189100007 PM 15683885 ER PT J AU Agashe, K Servant, G AF Agashe, K Servant, G TI Baryon number in warped grand unified theories: model building and (dark matter related) phenomenology SO JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS LA English DT Article DE dark matter; extra dimensions; cosmology of theories beyond the SM ID RANDALL-SUNDRUM MODEL; EXTRA DIMENSION; ELASTIC-SCATTERING; PROTON STABILITY; STRING THEORY; UNIFICATION; GEOMETRY; COMPACTIFICATION; GRAVITY; MIXINGS AB In the past year, a new non-supersymmetric framework for electroweak symmetry breaking ( with or without Higgs) involving SU(2)(L) x SU( 2)(R) x U(1)(B-L) in higher dimensional warped geometry has been suggested. In this work, we embed this gauge structure into a GUT such as SO(10) or Pati-Salam. We showed recently (in hep-ph/ 0403143) that in a warped GUT, a stable Kaluza-Klein fermion can arise as a consequence of imposing proton stability. Here, we specify a complete realistic model where this particle is a weakly interacting right-handed neutrino, and present a detailed study of this new dark matter candidate, providing relic density and detection predictions. We discuss phenomenological aspects associated with the existence of other light ( less than or similar to TeV) KK fermions ( related to the neutrino), whose lightness is a direct consequence of the top quark's heaviness. The AdS/CFT interpretation of this construction is also presented. Most of our qualitative results do not depend on the nature of the breaking of the electroweak symmetry provided that it happens near the TeV brane. C1 Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. Aspen Ctr Phys, Aspen, CO USA. RP Agashe, K (reprint author), Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. EM kagashe@pha.jhu.edu; servant@spht.saclay.cea.fr NR 81 TC 92 Z9 92 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 1475-7516 J9 J COSMOL ASTROPART P JI J. Cosmol. Astropart. Phys. PD FEB PY 2005 IS 2 AR 002 DI 10.1088/1475-7516/2005/02/002 PG 66 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 909JD UT WOS:000227855300002 ER PT J AU Easther, R Greene, BR Jackson, MG Kabat, D AF Easther, R Greene, BR Jackson, MG Kabat, D TI String windings in the early universe SO JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS LA English DT Article DE extra dimensions; string theory and cosmology ID COSMOLOGY; THERMODYNAMICS AB We study string dynamics in the early universe. Our motivation is the proposal of Brandenberger and Vafa that string winding modes may play a key role in decompactifying three spatial dimensions. We model the universe as a homogeneous but anisotropic nine-torus filled with a gas of excited strings. We adopt initial conditions which. x the dilaton and the volume of the torus, but otherwise assume all states are equally likely. We study the evolution of the system both analytically and numerically to determine the late-time behaviour. We find that, although dynamical evolution can indeed lead to three large spatial dimensions, such an outcome is not statistically favoured. C1 Yale Univ, Dept Phys, New Haven, CT 06520 USA. Columbia Univ, Inst Strings Cosmol & Astroparticle Phys, New York, NY 10027 USA. Columbia Univ, Dept Phys, New York, NY 10027 USA. Columbia Univ, Dept Math, New York, NY 10027 USA. Fermilab Natl Accelerator Lab, NASA Fermilab Theoret Astrophys Grp, Batavia, IL 60510 USA. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08855 USA. RP Easther, R (reprint author), Yale Univ, Dept Phys, New Haven, CT 06520 USA. EM richard.easther@yale.edu; greene@physics.columbia.edu; markj@fnal.gov; kabat@physics.columbia.edu OI Easther, Richard/0000-0002-7233-665X NR 35 TC 39 Z9 39 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 1475-7516 J9 J COSMOL ASTROPART P JI J. Cosmol. Astropart. Phys. PD FEB PY 2005 IS 2 AR 009 DI 10.1088/1475-7516/2005/02/009 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 909JD UT WOS:000227855300009 ER PT J AU An, K Reifsnider, KL AF An, K Reifsnider, KL TI A multiphysics modeling study of (Pr0.7Sr0.3)MnO3 +/-delta/8 mol % yttria-stabilized zirconia composite cathodes for solid oxide fuel cells SO JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY LA English DT Article ID PLANAR SOFC; POLARIZATION; PERFORMANCE; ELECTRODES; IMPEDANCE; TRANSPORT; ANODES; STACK AB Solid oxide fuel cells (SOFCs) are expected to be a future power source. Simulation analyses of SOFCs can help to understand well the interactive functions among the multiphysics phenomena in the SOFC system. A three-dimensional multiphysics finite-element model was used to simulate the performance of a half-cell SOFC with (Pr0.7Sr0.3)MnO3+/-delta/8 mol % yttria-stabilized zirconia (8YSZ) composite cathode 017 one side of the 8YSZ electrolyte before and after aging. Multiphysics phenomena in the SOFC were considered in the modeling. The current/voltage curves simulated matched the experimental data before and after aging. The average current density was found to have a linear relationship to the logarithm of the effective exchange current density. The effect of the effective ionic conductivity of the composite cathode was more apparent for small total effective ionic conductivity values than for large ones. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Univ Connecticut, Connecticut Global Fuel Cell Ctr, Storrs, CT 06269 USA. RP An, K (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. EM kean@vt.edu RI An, Ke/G-5226-2011 OI An, Ke/0000-0002-6093-429X NR 32 TC 5 Z9 5 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 1550-624X J9 J FUEL CELL SCI TECH JI J. Fuel Cell Sci. Technol. PD FEB PY 2005 VL 2 IS 1 BP 45 EP 51 DI 10.1115/1.1842782 PG 7 GA 046XO UT WOS:000237844600008 ER PT J AU O'Brien, JE Sohal, MS AF O'Brien, JE Sohal, MS TI Heat transfer enhancement for finned-tube heat exchangers with winglets SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article ID LONGITUDINAL VORTEX GENERATORS; OVAL TUBE AB This paper presents the results of an experimental study of forced convection heat transfer in a narrow rectangular duct fitted with a circular tube and/or a delta-winglet pair The duct was designed to simulate a single passage in a fin-tube heat exchanger Heat transfer measurements were obtained using a transient technique in which a heated airflow is suddenly introduced to the test section. High-resolution local fin-surface temperature distributions were obtained at several times after initiation of the transient using an imaging infrared camera. Corresponding local fin-surface heat transfer coefficient distributions were then calculated from a locally applied one-dimensional semi-infinite inverse heat conduction model. Heat transfer results were obtained over an airflow rate ranging from 1.51 x 10(-3) to 14.0 x 10(-3) kg/s. These flow rates correspond to a duct-height Reynolds number range of 670-6300 with a duct height of 1.106 cm and a duct width-to-height ratio, W/H, of 11.25. The test cylinder was sized such that the diameter-to-duct height ratio, D/H is 5. Results presented in this paper reveal visual and quantitative details of local fin-surface heat transfer distributions in the vicinity of a circular tube, a delta-winglet pair, and a combination of a circular tube and a delta-winglet pair Comparisons of local and average heat transfer distributions for the circular tube with and without winglets are provided. Overall mean fin-surface Nusselt-number results indicate a significant level of heat transfer enhancement associated with the deployment of the winglets with the circular cylinder At the lowest Reynolds numbers (which correspond to the laminar operating conditions of existing geothermal air-cooled condensers), the enhancement level is nearly a factor of 2. At higher Reynolds numbers, the enhancement level is close to 50%. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP O'Brien, JE (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 9 TC 17 Z9 19 U1 3 U2 6 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 2005 VL 127 IS 2 BP 171 EP 178 DI 10.1115/1.1842786 PG 8 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA 917JI UT WOS:000228456500008 ER PT J AU DeWolfe, O Giryavets, A Kachru, S Taylor, W AF DeWolfe, O Giryavets, A Kachru, S Taylor, W TI Enumerating flux vacua with enhanced symmetries SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Review DE superstrings and heterotic strings; superstring vacua ID CALABI-YAU COMPACTIFICATIONS; SOFT SUPERSYMMETRY BREAKING; COSMOLOGICAL CONSTANT; STRING THEORY; SPLIT SUPERSYMMETRY; IIB ORIENTIFOLDS; YANG-MILLS; F-THEORY; SUPERGRAVITY; MANIFOLDS AB We study properties of flux vacua in type-IIB string theory in several simple but illustrative models. We initiate the study of the relative frequencies of vacua with vanishing superpotential W = 0 and with certain discrete symmetries. For the models we investigate we also compute the overall rate of growth of the number of vacua as a function of the D3-brane charge associated to the fluxes, and the distribution of vacua on the moduli space. The latter two questions can also be addressed by the statistical theory developed by Ashok, Denef and Douglas, and our results are in good agreement with their predictions. Analysis of the first two questions requires methods which are more number-theoretic in nature. We develop some elementary techniques of this type, which are based on arithmetic properties of the periods of the compactification geometry at the points in moduli space where the flux vacua are located. C1 Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA. RP DeWolfe, O (reprint author), Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. EM odewolfe@princeton.edu; giryav@stanford.edu; skachru@stanford.edu; wati@mit.edu NR 106 TC 54 Z9 54 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 FEB PY 2005 IS 2 AR 037 PG 69 WC Physics, Particles & Fields SC Physics GA 922TK UT WOS:000228861300037 ER PT J AU Horava, P Shepard, PG AF Horava, P Shepard, PG TI Topology changing transitions in bubbling geometries SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE superstrings and heterotic strings; Penrose limit and pp-wave background; AdS-CFT and dS-CFT correspondence; matrix models AB Topological transitions in bubbling half-BPS type-IIB geometries with SO (4) x SO(4) symmetry can be decomposed into a sequence of n elementary transitions. The half-BPS solution that describes the elementary transition is seeded by a phase space distribution of fermions filling two diagonal quadrants. We study the geometry of this solution in some detail. We show that this solution can be interpreted as a time dependent geometry, interpolating between two asymptotic pp-waves in the far past and the far future. The singular solution at the transition can be resolved in two different ways, related by the particle-hole duality in the effective fermion description. Some universal features of the topology change are governed by two-dimensional type-0B string theory, whose double scaling limit corresponds to the Penrose limit of AdS(5) x S-5 at topological transition. In addition, we present the full class of geometries describing the vicinity of the most general localized classical singularity that can occur in this class of half-BPS bubbling geometries. C1 Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Horava, P (reprint author), Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA. EM horava@socrates.berkeley.edu; pgs@socrates.berkeley.edu NR 18 TC 22 Z9 22 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 FEB PY 2005 IS 2 AR 063 PG 22 WC Physics, Particles & Fields SC Physics GA 922TK UT WOS:000228861300063 ER PT J AU McAllister, L Mitra, I AF McAllister, L Mitra, I TI Relativistic D-brane scattering is extremely inelastic SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE D-branes; brane dynamics in gauge theories ID CREATION; STRINGS AB We study the effects of quantum production of open strings on the relativistic scattering of D-branes. We find strong corrections to the brane trajectory from copious production of highly-excited open strings, whose typical oscillator level is proportional to the square of the rapidity. In the corrected trajectory, the branes rapidly coincide and remain trapped in a configuration with enhanced symmetry. This is a purely stringy effect which makes relativistic brane collisions exceptionally inelastic. We trace this effect to velocity-dependent corrections to the open string mass, which render open strings between relativistic D-branes surprisingly light. We observe that pair-creation of open strings could play an important role in cosmological scenarios in which branes approach each other at very high speeds. C1 Stanford Univ, SLAC, Stanford, CA 94309 USA. Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP McAllister, L (reprint author), Stanford Univ, SLAC, Stanford, CA 94309 USA. EM lpm@stanford.edu; imitra@socrates.berkeley.edu NR 39 TC 17 Z9 17 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 FEB PY 2005 IS 2 AR 019 PG 29 WC Physics, Particles & Fields SC Physics GA 922TK UT WOS:000228861300019 ER PT J AU Nagatani, Y Perez, G AF Nagatani, Y Perez, G TI Leptogenesis from split fermions SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE baryogenesis; beyond standard model; neutrino physics; CP violation ID MODEL CP-VIOLATION; STANDARD MODEL; ELECTROWEAK BARYOGENESIS; BARYON ASYMMETRY AB We present a new type of leptogenesis mechanism based on a two-scalar split-fermions framework. At high temperatures the bulk scalar vacuum expectation values (VEVs) vanish and lepton number is strongly violated. Below some temperature, T-c, the scalars develop extra dimension dependent VEVs. This transition is assumed to proceed via a first order phase transition. In the broken phase the fermions are localized and lepton number violation is negligible. The lepton-bulk scalar Yukawa couplings contain sizable CP phases which induce lepton production near the interface between the two phases. We provide a qualitative estimation of the resultant baryon asymmetry which agrees with current observation. The neutrino flavor parameters are accounted for by the above model with an additional approximate U(1) symmetry. C1 Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Nagatani, Y (reprint author), Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. EM yukinori.nagatani@weizmann.ac.il; gperez@lbl.gov NR 28 TC 11 Z9 11 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 FEB PY 2005 IS 2 AR 068 PG 9 WC Physics, Particles & Fields SC Physics GA 922TK UT WOS:000228861300068 ER PT J AU Navarro, I Santiago, J AF Navarro, I Santiago, J TI Gravity on codimension 2 brane worlds SO JOURNAL OF HIGH ENERGY PHYSICS LA English DT Article DE field theories in higher dimensions; p-branes; classical theories of gravity ID COSMOLOGICAL CONSTANT PROBLEM; 6 DIMENSIONS; GENERAL-RELATIVITY; ABELIAN VORTICES; EXTRA DIMENSION; DEFICIT; COMPACTIFICATION; ACCELERATION; SUPERGRAVITY; EVOLUTION AB We compute the matching conditions for a general thick codimension 2 brane, a necessary previous step towards the investigation of gravitational phenomena in codimension 2 braneworlds. We show that, provided the brane is weakly curved, they are specified by the integral in the extra dimensions of the brane energy-momentum, independently of its detailed internal structure. These general matching conditions can then be used as boundary conditions for the bulk solution. By evaluating Einstein equations at the brane boundary we are able to write an evolution equation for the induced metric on the brane depending only on physical brane parameters and the bulk energy-momentum tensor. We particularise to a cosmological metric and show that a realistic cosmology can be obtained in the simplest case of having just a non-zero cosmological constant in the bulk. We point out several parallelisms between this case and the codimension 1 brane worlds in an AdS space. C1 Univ Durham, IPPP, Durham DH1 3LE, England. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Navarro, I (reprint author), Univ Durham, IPPP, Durham DH1 3LE, England. EM ignacio.navarro@durham.ac.uk; jsantiag@fnal.gov NR 62 TC 45 Z9 45 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 FEB PY 2005 IS 2 AR 007 PG 21 WC Physics, Particles & Fields SC Physics GA 922TK UT WOS:000228861300007 ER PT J AU Wagner, D Maser, J Lai, B Cai, ZH Barry, CE Bentrup, KHZ Russell, DG Bermudez, LE AF Wagner, D Maser, J Lai, B Cai, ZH Barry, CE Bentrup, KHZ Russell, DG Bermudez, LE TI Elemental analysis of Mycobacterium avium-, Mycobacterium tuberculosis-, and Mycobacterium smegmatis-containing phagosomes indicates pathogen-induced microenvironments within the host cell's endosomal system SO JOURNAL OF IMMUNOLOGY LA English DT Article ID IRON TRANSPORT; SUPEROXIDE-DISMUTASE; MOUSE MACROPHAGES; VIRULENCE; TRANSFERRIN; INFECTION; NRAMP1; ACIDIFICATION; ACTIVATION; EXPRESSION AB Mycobacterium avium and Mycobacterium tuberculosis are human pathogens that infect and replicate within macrophages Both organisms live in phagosomes that fail to fuse with lysosomes and have adapted their lifestyle to accommodate the changing environment within the endosomal system. Among the many environmental factors that could influence. expression of bacterial genes are the concentrations of single elements within the phagosomes. We used a novel hard x-ray microprobe with suboptical spatial resolution to analyze characteristic x-ray fluorescence of 10 single elements inside phagosomes of macrophages infected with M. tuberculosis and M avium or with avirulent M. smegmatis. The iron concentration decreased over time in phagosomes of macrophages infected with Mycobacterium smegmatis but increased in those infected with pathogenic mycobacteria. Autoradiography of infected macrophages incubated with Fe-59-loaded transferrin demonstrated that the bacteria could acquire iron delivered via the endocytic-route, confirming the. results obtained in the x-ray microscopy. In addition. the concentrations of chlorine, calcium, potassium, manganese, copper, and zinc were shown to differ between the vacuole of pathogenic mycobacteria and M smegmatis. Differences in the concentration of several elements between M. avium and M. tuberculosis vacuoles were also observed. Activation of macrophages with recombinant IFN-gamma or TNF-alpha before infection altered the concentrations of elements in the, phagosome, which was not observed in cells activated following infection. Siderophore knockout M. tuberculosis vacuoles exhibited retarded acquisition of iron ' compared with phagosomes with wild-type M. tuberculosis. This is a unique approach to define the environmental conditions within the pathogen-containing compartment. C1 Kuzell Inst Arthritis & Infect Dis, San Francisco, CA 94115 USA. Univ Freiburg, Dept Internal Med 2 Infect Dis, Freiburg, Germany. Argonne Natl Lab, Expt Fac Div, Argonne, IL 60439 USA. NIH, Tuberculosis Res Sect, Host Def Lab, Rockville, MD 20852 USA. Cornell Univ, Coll Vet Med, Dept Microbiol & Immunol, Ithaca, NY 14853 USA. RP Bermudez, LE (reprint author), Oregon State Univ, Coll Vet Med, Dept Biomed Sci, 105 Magruder Hall, Corvallis, OR 97331 USA. EM Luiz.Bermudez@oregonstate.edu RI Russell, David/D-4533-2009; Barry, III, Clifton/H-3839-2012; Wagner, Dirk/G-4598-2013; Maser, Jorg/K-6817-2013; Wagner, Dirk/D-9778-2016 OI Wagner, Dirk/0000-0002-3271-5815 FU Intramural NIH HHS [Z01 AI000783-11]; NIAID NIH HHS [R01-AI 47010] NR 41 TC 189 Z9 195 U1 0 U2 15 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD FEB 1 PY 2005 VL 174 IS 3 BP 1491 EP 1500 PG 10 WC Immunology SC Immunology GA 891HG UT WOS:000226571300044 PM 15661908 ER PT J AU Thyrell, L Sangfelt, O Zhivotovsky, B Pokrovskaja, K Wang, YS Einhorn, S Grander, D AF Thyrell, L Sangfelt, O Zhivotovsky, B Pokrovskaja, K Wang, YS Einhorn, S Grander, D TI The HPV-16 E7 oncogene sensitizes malignant cells to IFN-alpha-induced apoptosis SO JOURNAL OF INTERFERON AND CYTOKINE RESEARCH LA English DT Article ID NECROSIS-FACTOR-ALPHA; TUMOR-SUPPRESSOR PROTEIN; HUMAN-PAPILLOMAVIRUS; INTERFERON-ALPHA; HUMAN KERATINOCYTES; ONCOPROTEIN; GROWTH; P53; ACTIVATION; INDUCTION AB Interferons (IFNs) exert antitumor effects in several human malignancies, but their mechanism of action is unclear. There is a great variability in sensitivity to IFN treatment depending on both tumor type and the individual patient. The reason for this variable sensitivity is not known. The fact that several IFN-induced anticellular effects are exerted through modulation of proto-oncogenes and tumor suppressor genes may indicate that the malignant genotype may be decisive in the cell's sensitivity to IFN. To determine if a deregulated oncogene could alter the cellular response to IFN, a mouse lymphoma cell line (J3D) was stably transfected with the viral human papillomavirus-16 (HPV-16) E7 oncogene. The E7-transfected cells and their respective mock-transfected sister clones were treated with IFN-alpha and examined for possible IFN-induced anticellular effects. We found that the E7-transfected clones were greatly sensitized to IFN-alpha-induced apoptosis compared with their mock-transfected counterparts. Induction of apoptosis in the transfected cells correlated with the ability of IFN to activate parts of the proapoptotic machinery specifically in these cells, including activation of caspases and the proapoptotic protein Bak. In summary, our data suggest that transfection of malignant cells with the E7 oncogene can sensitize them to IFN-a-induced apoptosis. This demonstrates that an oncogenic event may alter the cellular sensitivity to IFN and might also have implications for treatment of HPV-related diseases with IFN. C1 Karolinska Hosp & Inst, Res Lab Radiumhemmet, CCK, Dept Pathol & Oncol, S-17176 Stockholm, Sweden. Karolinska Inst, Dept Toxicol, Inst Environm Med, S-17177 Stockholm, Sweden. Oak Ridge Natl Lab, Funct Genomics Grp, Div Life Sci, Oak Ridge, TN 37831 USA. RP Grander, D (reprint author), Karolinska Hosp & Inst, Res Lab Radiumhemmet, CCK, Dept Pathol & Oncol, Bldg R8,03, S-17176 Stockholm, Sweden. EM Dan.Grander@cck.ki.se NR 35 TC 5 Z9 5 U1 0 U2 1 PU MARY ANN LIEBERT INC PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 USA SN 1079-9907 J9 J INTERF CYTOK RES JI J. Interferon Cytokine Res. PD FEB PY 2005 VL 25 IS 2 BP 63 EP 72 DI 10.1089/jir.2005.25.63 PG 10 WC Biochemistry & Molecular Biology; Cell Biology; Immunology SC Biochemistry & Molecular Biology; Cell Biology; Immunology GA 898IG UT WOS:000227069900001 PM 15695927 ER PT J AU Vasdev, N Dorff, PN Gibbs, AR Nandanan, E Reid, LM O'Neill, JP VanBrocklin, HF AF Vasdev, N Dorff, PN Gibbs, AR Nandanan, E Reid, LM O'Neill, JP VanBrocklin, HF TI Synthesis of 6-acrylamido-4-(2-[F-18]fluoroanilino)quinazoline: a prospective irreversible EGFR binding probe SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE EGFR; fluorine-18; PET; quinazoline ID GROWTH-FACTOR RECEPTOR; INHIBITORS; BIOMARKER; ML03 AB Acrylamido-quinazolines substituted at the 6-position bind irreversibly to the intracellular ATP binding domain of the epidermal growth factor receptor (EGFR). A general route was developed for preparing 6-substituted-4-anilinoquinazolines from [F-18]fluoroanilines for evaluation as EGFR targeting agents with PET. By a cyclization reaction, 2-[F-18]fluoroaniline was reacted with N'-(2-cyano-4-nitrophenyl)-N,N-dimethylimidoformamide to produce 6-nitro-4-(2-[F-18]fluoroanilino)quinazoline in 27.5% decay-corrected radiochemical yield. Acid mediated tin chloride reduction of the nitro group was achieved in 5 min (80% conversion) and subsequent acylation with acrylic acid gave 6-acrylamido-4-(2-[F-18]fluoroanilino)quinazoline in 8.5% decay-corrected radiochemical yield, from starting fluoride, in less than 2 h. Copyright (C) 2005 John Wiley Sons, Ltd. C1 Lawrence Berkeley Natl Lab, Dept Nucl Med & Funct Imaging, Berkeley, CA 94720 USA. Mol Therapeut Inc, Ann Arbor, MI 48104 USA. RP VanBrocklin, HF (reprint author), Lawrence Berkeley Natl Lab, Dept Nucl Med & Funct Imaging, 1 Cyclotron Rd,MS55R0121, Berkeley, CA 94720 USA. EM hfvanbrocklin@lbl.gov RI Erathodiyil, Nandanan/A-8333-2010 NR 12 TC 27 Z9 28 U1 1 U2 4 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 0362-4803 J9 J LABELLED COMPD RAD JI J. Label. Compd. Radiopharm. PD FEB PY 2005 VL 48 IS 2 BP 109 EP 115 DI 10.1002/jlcr.903 PG 7 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA 899BQ UT WOS:000227120300003 ER PT J AU Kalos, MH Colletti, L Pederiva, F AF Kalos, MH Colletti, L Pederiva, F TI Fermion Monte Carlo calculations of liquid He-3 SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Symposium on Quantum Fluids and Solids (QFS 2004) CY JUL 05-09, 2004 CL Univ Trento, Povo, ITALY HO Univ Trento ID HELIUM; PAIRS AB Methods and results for calculations of the ground state energy of the bulk System of He-3 atoms are discussed. Results are encouraging: we believe that they demonstrate that our methods offer a solution of the "fermion sign problem" and the possibility of direct computation of many-fermion systems with no uncontrolled approximations. Although the method is still rather inefficient compared to variational or fixed-node methods, we have been able to obtain useful answers. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Trent, Dipartimento Fis, I-38050 Povo, TN, Italy. Free Univ Bolzano, Dept Comp Sci, I-39100 Bolzano, Italy. DEMOCRITOS INFM Natl Simulat Ctr, Trieste, Italy. RP Kalos, MH (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RI Colletti, Leonardo/F-9381-2011 NR 10 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD FEB PY 2005 VL 138 IS 3-4 SI SI BP 747 EP 752 DI 10.1007/s10909-005-2297-9 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 908JU UT WOS:000227784100044 ER PT J AU Nazaretski, E Dimov, S Pohl, RO Parpia, JM AF Nazaretski, E Dimov, S Pohl, RO Parpia, JM TI Acoustic and thermal properties of Stycast 1266 below 100 mK SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Symposium on Quantum Fluids and Solids (QFS 2004) CY JUL 05-09, 2004 CL Univ Trento, Povo, ITALY HO Univ Trento ID AMORPHOUS SILICA; TUNNELING MODEL; CONDUCTIVITY; OSCILLATOR; GLASSES AB We report on the acoustic and thermal behavior of a Stycast 1266 - quartz composite torsional oscillator below 100 mK. The epoxy exhibits heat release manifested by a strong time dependence of the sound velocity below 10 mK. Also, the Stycast sample is sensitive to both gamma and mu radiation, displaying transients superposed on the resonant response of the composite oscillator, as well as heating when exposed to a Na-22 source. The long thermal relaxation time of the tunneling states together with the high thermal resistance limits the lowest achievable temperature in this insulating amorphous material. C1 Cornell Univ, LASSP, Ithaca, NY 14853 USA. Cornell Univ, CCMR, Ithaca, NY 14853 USA. RP Nazaretski, E (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM jmp9@cornell.edu NR 16 TC 3 Z9 3 U1 0 U2 4 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD FEB PY 2005 VL 138 IS 3-4 SI SI BP 881 EP 886 DI 10.1007/s10909-005-2319-7 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 908JU UT WOS:000227784100066 ER PT J AU Steinwart, I Hush, D Scovel, C AF Steinwart, I Hush, D Scovel, C TI A classification framework for anomaly detection SO JOURNAL OF MACHINE LEARNING RESEARCH LA English DT Article DE unsupervised learning; anomaly detection; density levels; classification; SVMs ID NOVELTY DETECTION; DENSITY-ESTIMATION; SUPPORT; CLASSIFIERS; CONTOUR AB One way to describe anomalies is by saying that anomalies are not concentrated. This leads to the problem of finding level sets for the data generating density. We interpret this learning problem as a binary classification problem and compare the corresponding classification risk with the standard performance measure for the density level problem. In particular it turns out that the empirical classification risk can serve as an empirical performance measure for the anomaly detection problem. This allows us to compare different anomaly detection algorithms empirically, i. e. with the help of a test set. Furthermore, by the above interpretation we can give a strong justification for the well-known heuristic of artificially sampling "labeled" samples, provided that the sampling plan is well chosen. In particular this enables us to propose a support vector machine (SVM) for anomaly detection for which we can easily establish universal consistency. Finally, we report some experiments which compare our SVM to other commonly used methods including the standard one-class SVM. C1 Los Alamos Natl Lab, Modeling Algorithms & Informat Grp, Los Alamos, NM 87545 USA. RP Steinwart, I (reprint author), Los Alamos Natl Lab, Modeling Algorithms & Informat Grp, CCS-3, Los Alamos, NM 87545 USA. EM INGO@LANL.GOV; DHUSH@LANL.GOV; JCS@LANL.GOV OI Steinwart, Ingo/0000-0002-4436-7109 NR 33 TC 96 Z9 99 U1 3 U2 7 PU MICROTOME PUBLISHING PI BROOKLINE PA 31 GIBBS STREET, BROOKLINE, MA 02446 USA SN 1532-4435 J9 J MACH LEARN RES JI J. Mach. Learn. Res. PD FEB PY 2005 VL 6 BP 211 EP 232 PG 22 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA 026HC UT WOS:000236329000002 ER PT J AU Bowman, MK Mailer, C Halpern, HJ AF Bowman, MK Mailer, C Halpern, HJ TI The solution conformation of triarylmethyl radicals SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article DE trityl radical; ENDOR; pulsed EPR ID ELECTRON-PARAMAGNETIC-RESONANCE; DYNAMIC NUCLEAR-POLARIZATION; HIGH-RESOLUTION; EPR; LINE; SPECTROSCOPY; COHERENCE; SPECTRA; PROBE; DNP AB Hyperfine coupling tensors to H-1, H-2, and natural abundance C-13 were measured using X-band pulsed electron nuclear double resonance (ENDOR) spectroscopy for two triarylmethyl (trityl) radicals used in electron paramagnetic resonance imaging and oximetry: methyl tris(8-carboxy-2,2,6,6-tetramethyl-benzo[1,2d:4,5-d']bis(1,3)dithiol-4-yl) and methyl tris(8-carboxy-2,2,6,6-tetramethyl(-d(3))-benzo[1,2d:4,5-d']bis(1,3)dithiol-4-yl). Quantum chemical calculations using density functional theory predict a structure that reproduces the experimentally determined hyperfine tensors. The radicals are propeller-shaped with the three aryl rings nearly mutually orthogonal. The central carbon atom carrying most of the Unpaired electron spin density is surrounded by the sulfur atoms in the radical and is completely shielded from solvent. This structure explains features of the electron spin relaxation of these radicals and suggests ways in which the radicals can be chemically modified to improve their characteristics for imaging and oximetry. (C) 2004 Elsevier Inc. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Ctr EPR Imaging Vivo Physiol, Dept Radiat & Cellular Oncol, Chicago, IL 60637 USA. RP Bowman, MK (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM michael.bowman@pnl.gov RI Bowman, Michael/F-4265-2011 OI Bowman, Michael/0000-0003-3464-9409 FU NIBIB NIH HHS [EB002034]; NIGMS NIH HHS [GM61904] NR 28 TC 30 Z9 30 U1 1 U2 21 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1090-7807 J9 J MAGN RESON JI J. Magn. Reson. PD FEB PY 2005 VL 172 IS 2 BP 254 EP 267 DI 10.1016/j.jmr.2004.10.010 PG 14 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA 893OB UT WOS:000226728000010 PM 15649753 ER PT J AU Cheng, RH Pearson, J Li, DQ AF Cheng, RH Pearson, J Li, DQ TI Guided self-assembly growth of epitaxial Co dots on lithographically pattered Ru single crystals SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 5th International Symposium on Metallic Multilayers CY JUN 08-11, 2004 CL Natl Inst Stand & Technol, Boulder, CO HO Natl Inst Stand & Technol DE magnetic nanostructures; magnetic anisotropy ID FE FILMS AB Epitaxial Co islands were grown onto lithographically etched Ru(0 0 0 1) substrate at 350degreesC and characterized ex situ with atomic force microscopy, magnetic force microscopy, and magneto-optical Kerr effect. On 100-nm deep, 6 x 6 mum(2) etched squares, the submicron Co islands tend to decorate the edges. In contrast, on shallow patterns of 5-nm deep and 750-nm wide lines, no preferred island location was observed. The islands tend to elongate into stripes and fine wires when the etched lines are along high-symmetry directions. All patterns induce an in-plane easy axis along the lithographic pattern edges. (C) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Cheng, RH (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 EI 1873-4766 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB 1 PY 2005 VL 286 SI SI BP 14 EP 17 DI 10.1016/j.jmmm.2004.09.027 PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 892GP UT WOS:000226638400005 ER PT J AU Camley, RE Lohstroh, W Felcher, GP Hosoito, N Hashizume, H AF Camley, RE Lohstroh, W Felcher, GP Hosoito, N Hashizume, H TI Tunable thermal hysteresis in magnetic multilayers: magnetic superheating and supercooling SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 5th International Symposium on Metallic Multilayers CY JUN 08-11, 2004 CL Natl Inst Stand & Technol, Boulder, CO HO Natl Inst Stand & Technol DE Fe; Gd; magnetic multilayers; thermal hysteresis ID PHASE-TRANSITIONS; GD/FE MULTILAYERS; SPIN CONFIGURATIONS; FE/GD MULTILAYERS; TWISTED STATE; SUPERLATTICES; GD; MAGNETORESISTANCE; SCATTERING; DICHROISM AB The phenomena of superheating and supercooling can lead to a thermal hysteresis curve where two states are stable over a range of temperatures. Here we present a simple magnetic multilayer system (Fe/Gd) that can be designed to show a thermal hysteresis curve. Calculations show that, with proper choice of parameters, the width, in temperature, of the hysteresis curve can be controlled by an external magnetic field and varies from 20 to 100 K over a field range of 300-600 Oe. Polarized neutron reflectivity measurements confirm that such behavior is realized experimentally in multilayers of Fe/Gd. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Colorado, Dept Phys, Colorado Springs, CO 80933 USA. Free Univ Amsterdam, NL-1081 HV Amsterdam, Netherlands. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Nara Inst Sci & Technol, Res & Educ Ctr Mat Sci, Ikoma 6300192, Japan. RP Camley, RE (reprint author), Univ Colorado, Dept Phys, 1420 Austin Bluffs Pkwy,POB 7150, Colorado Springs, CO 80933 USA. EM rcamley@uccs.edu NR 19 TC 20 Z9 20 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 EI 1873-4766 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB 1 PY 2005 VL 286 SI SI BP 65 EP 71 DI 10.1016/j.jmmm.2004.09.041 PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 892GP UT WOS:000226638400016 ER PT J AU Cho, YC Kim, DH Lee, KD Im, JS You, CY Shin, SC AF Cho, YC Kim, DH Lee, KD Im, JS You, CY Shin, SC TI Correlation between local coercivity variation and local relaxation time with varying the field sweeping rate in Co/Pd multilayer wires SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 5th International Symposium on Metallic Multilayers CY JUN 08-11, 2004 CL Natl Inst Stand & Technol, Boulder, CO HO Natl Inst Stand & Technol DE Co/Pd multilayer wire; local coercivity; local relaxation time; field sweeping rate ID ULTRATHIN FERROMAGNETIC-FILMS; MAGNETIZATION-REVERSAL; ANISOTROPY; PD/CO AB We have investigated the effect of the field sweeping rate on the correlation between the local coercivity variation and the local relaxation time in Co/Pd multilayer wire with width of 10mum. The local coercivity variations at various field sweeping rates are obtained from two-dimensional arrays of the local hysteresis loops and the local relaxation times are determined from time-resolved domain evolution patterns at exactly the same position of the sample. The activation volume determined from the correlation between the local coercivity variation and the local relaxation time is found to be independent of the sweeping rate variation within an experimental error. (C) 2004 Elsevier B.V. All rights reserved. C1 Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Inha Univ, Dept Phys, Inchon, South Korea. RP Cho, YC (reprint author), Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea. EM scshin@kaist.ac.kr RI You, Chun-Yeol/B-1734-2010; Shin, Sung-Chul/C-1992-2011 OI You, Chun-Yeol/0000-0001-9549-8611; NR 10 TC 0 Z9 0 U1 1 U2 1 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 FEB 1 PY 2005 VL 286 SI SI BP 177 EP 180 DI 10.1016/j.jmmm.2004.09.024 PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 892GP UT WOS:000226638400040 ER PT J AU Krishnamurthy, VV te Velthuis, SGE Srinath, S Mani, P Mankey, GJ AF Krishnamurthy, VV te Velthuis, SGE Srinath, S Mani, P Mankey, GJ TI Growth and magnetic properties of epitaxial Au/Fe/Au and Ag/Fe/Au films on alpha-Al2O3 SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 5th International Symposium on Metallic Multilayers CY JUN 08-11, 2004 CL Natl Inst Stand & Technol, Boulder, CO HO Natl Inst Stand & Technol DE magnetic multilayers; nanostructure; iron; neutron reflectivity ID AU(111); FE AB Nanoscale Fe(1 1 0) layers have been fabricated on alpha-Al2O3 using DC magnetron sputtering with Au(1 1 1) or Ag(1 1 1) as a buffer layer. Atomic force microscopy shows that Au(1 1 1) grows as a continuous layer and Ag(1 1 1) grows as nanoislands of irregular shapes and sizes. Magneto-optic Kerr effect shows that a 12nm Fe(1 1 0) layer deposited on Au(1 1 1) at 295 K and on Ag(1 1 1) at 640 K is ferromagnetic at room temperature. In-plane magnetic anisotropy is observed for the Fe(1 1 0) layer on Au(1 1 1). The layer thickness, the surface coverage and the magnetization of the films have been determined by polarized neutron reflectometry. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Krishnamurthy, VV (reprint author), Univ Alabama, Ctr Mat Informat Technol, Box 870209, Tuscaloosa, AL 35487 USA. EM vemuru@bama.ua.edu RI te Velthuis, Suzanne/I-6735-2013; Mankey, Gary/G-9110-2011 OI te Velthuis, Suzanne/0000-0002-1023-8384; Mankey, Gary/0000-0003-3163-5159 NR 6 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB 1 PY 2005 VL 286 SI SI BP 432 EP 436 DI 10.1016/j.jmmm.2004.09.060 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 892GP UT WOS:000226638400092 ER PT J AU Cubbins, LA Vannoy, D AF Cubbins, LA Vannoy, D TI Socioeconomic resources, gender traditionalism, and wife abuse in urban Russian couples SO JOURNAL OF MARRIAGE AND FAMILY LA English DT Article; Proceedings Paper CT Annual Meeting of the National-Council-on-Family-Relations CY NOV, 1997 CL ARLINGTON, VA SP Natl Council Family Relat DE domestic violence; family violence; resource theory; Russian family spousal abuse; wife abuse ID INTIMATE PARTNER VIOLENCE; DOMESTIC VIOLENCE; ALCOHOL-CONSUMPTION; UNITED-STATES; FAMILY; PERPETRATOR; TRANSITIONS; HOMICIDE; DISTRESS; STRESS AB Until recently, Soviet data restrictions led to limited knowledge about wife abuse in Russia. This study adds to emerging research on Russian domestic violence by testing hypotheses derived front resource theory on the effects on wife abuse of husband's absolute resources versus spouses' relative resources. Analysis of data from the 1996 National Survey of Russian Marriages (N = 664) shows support only for the influence of husband's absolute socioeconomic resources (education, employment status, and occupational rank). As in U.S. studies, intergenerational patterns of wife abuse and husband's alcohol use have notable effects on wife abuse. The findings suggest that although resource theory may partly explain wife abuse in urban Russia, spouses' relative resources and husband's gender traditionalism currently have little influence. C1 Battelle Seattle Res Ctr, Seattle, WA 98109 USA. Univ Cincinnati, Dept Sociol, Cincinnati, OH 45221 USA. RP Cubbins, LA (reprint author), Battelle Seattle Res Ctr, 1100 Dexter Ave N,Suite 400, Seattle, WA 98109 USA. EM cubbins1@battelle.org NR 54 TC 29 Z9 30 U1 4 U2 7 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0022-2445 J9 J MARRIAGE FAM JI J. Marriage Fam. PD FEB PY 2005 VL 67 IS 1 BP 37 EP 52 DI 10.1111/j.0022-2445.2005.00004.x PG 16 WC Family Studies; Sociology SC Family Studies; Sociology GA 893XN UT WOS:000226754500004 ER PT J AU Palmblad, M Buchholz, BA Hillegonds, DJ Vogel, JS AF Palmblad, M Buchholz, BA Hillegonds, DJ Vogel, JS TI Neuroscience and accelerator mass spectrometry SO JOURNAL OF MASS SPECTROMETRY LA English DT Article DE accelerator mass spectrometry; carbon-14; radiocarbon; diisopropyl fluorophosphate; Alzheimer's disease ID CENTRAL-NERVOUS-SYSTEM; BOMB C-14; ATRAZINE METABOLITES; SYNAPTIC PLASTICITY; BIOCHEMICAL SAMPLES; HUMAN URINE; GRAPHITE; ALUMINUM; EXPOSURE; RATS AB Accelerator mass spectrometry (AMS) is a mass spectrometric method for quantifying rare isotopes. It has had a great impact in geochronology and archaeology and is now being applied in biomedicine. AMS measures radioisotopes such as (3)H, (14)C, (26)Al, (36)Cl and (41)Ca, with zepto- or attomole sensitivity and high precision and throughput, allowing safe human pharmacokinetic studies involving microgram doses, agents having low bioavailability or toxicology studies where administered doses must be kept low (<1 mug kg(-1)). It is used to study long-term pharmacokinetics, to identify biomolecular interactions, to determine chronic and low-dose effects or molecular targets of neurotoxic substances, to quantify transport across the blood-brain barrier and to resolve molecular turnover rates in the human brain on the time-scale of decades. We review here how AMS is applied in neurotoxicology and neuroscience. Copyright (C) 2005 John Wiley Sons, Ltd. C1 Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RP Vogel, JS (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. EM vogel@llnl.gov RI Buchholz, Bruce/G-1356-2011; Palmblad, Magnus/B-8649-2016 OI Palmblad, Magnus/0000-0002-5865-8994 FU NCRR NIH HHS [P41 RR013461] NR 54 TC 12 Z9 12 U1 0 U2 6 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 1076-5174 J9 J MASS SPECTROM JI J. Mass Spectrom. PD FEB PY 2005 VL 40 IS 2 BP 154 EP 159 DI 10.1002/jms.734 PG 6 WC Biochemical Research Methods; Chemistry, Analytical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA 902FS UT WOS:000227340500004 PM 15706618 ER PT J AU Zhao, YH Liao, XZ Zhu, YT Valiev, RZ AF Zhao, YH Liao, XZ Zhu, YT Valiev, RZ TI Enhanced mechanical properties in ultrafine grained 7075 Al alloy SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ZN-MG; ECAP; MICROSTRUCTURE; 7075-AL-ALLOY; EVOLUTION; SYSTEM; SIZE AB Highest strength for 7075 Al alloy was obtained by combining the equal-channel-angular pressing (ECAP) and natural aging processes. The tensile yield strength and ultimate strength of the ECAP processed and naturally aged sample were 103% and 35% higher, respectively, than those of the coarse-grained 7075 Al alloy counterpart. The enhanced strength resulted from high densities of Guinier-Preston (G-P) zones and dislocations. This study shows that severe plastic deformation has the potential to significantly enhance the mechanical properties of precipitate hardening 7000 series Al alloys. C1 Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA. Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia. RP Zhu, YT (reprint author), Los Alamos Natl Lab, Mat Sci & Technol Div, POB 1663, Los Alamos, NM 87545 USA. EM yzhu@lanl.gov RI Zhu, Yuntian/B-3021-2008; Zhao, Yonghao/A-8521-2009; Liao, Xiaozhou/B-3168-2009; Lujan Center, LANL/G-4896-2012 OI Zhu, Yuntian/0000-0002-5961-7422; Liao, Xiaozhou/0000-0001-8565-1758; NR 20 TC 30 Z9 31 U1 1 U2 12 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 FEB PY 2005 VL 20 IS 2 BP 288 EP 291 DI 10.1557/JMR.2005.0057 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA 928SW UT WOS:000229293000003 ER PT J AU Sounart, TL Michalske, TA Zavadil, KR AF Sounart, TL Michalske, TA Zavadil, KR TI Frequency-dependent electrostatic actuation in microfluidic MEMS SO JOURNAL OF MICROELECTROMECHANICAL SYSTEMS LA English DT Article DE actuators; comb drive; double layer; electrode polarization; water ID SYSTEMS MEMS; SEPARATION; CHANNELS; DEVICES; DESIGN; CHIP AB Electrostatic actuators exhibit fast response times and are easily integrated into microsystems because they can be fabricated with standard IC micromachining processes and materials. Although electrostatic actuators have been used extensively in "dry" MEMS, they have received less attention in microfluidic systems probably because of challenges such as electrolysis, anodization, and electrode polarization. Here we demonstrate that ac drive signals can be used to prevent electrode polarization, and thus enable electrostatic actuation in many liquids, at potentials low enough to avoid electrochemistry. We measure the frequency response of an interdigitated silicon comb-drive actuator in liquids spanning a decade of dielectric permittivities and four decades of conductivity, and present a simple theory that predicts the characteristic actuation frequency. The analysis demonstrates the importance of the native oxide on silicon actuator response, and suggests that the actuation frequency can be shifted by controlling the thickness of the oxide. For native silicon devices, actuation is predicted at frequencies less than 10 MHz, in electrolytes of ionic strength up to 100 mmol/L, and thus electrostatic actuation may be feasible in many bioMEMS and other microfluidic applications. C1 Sandia Natl Labs, Mat & Proc Sci Ctr, Albuquerque, NM 87185 USA. Sandia Natl Labs, Dept Energy Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, Mat & Proc Sci Ctr, POB 5800, Albuquerque, NM 87185 USA. EM tlsouna@sandia.gov NR 44 TC 66 Z9 67 U1 0 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1057-7157 EI 1941-0158 J9 J MICROELECTROMECH S JI J. Microelectromech. Syst. PD FEB PY 2005 VL 14 IS 1 BP 125 EP 133 DI 10.1109/JMEMES.2004.839006 PG 9 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Instruments & Instrumentation; Physics, Applied SC Engineering; Science & Technology - Other Topics; Instruments & Instrumentation; Physics GA 896WP UT WOS:000226965200014 ER PT J AU Wang, G Shen, J Sun, JF Huang, YJ Zou, J Lu, ZP Stachurski, ZH Zhou, BD AF Wang, G Shen, J Sun, JF Huang, YJ Zou, J Lu, ZP Stachurski, ZH Zhou, BD TI Superplasticity and superplastic forming ability of a Zr-Ti-Ni-Cu-Be bulk metallic glass in the supercooled liquid recgion SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID DEFORMATION-BEHAVIOR; AMORPHOUS ALLOY; REGION; TRANSITION; VISCOSITY; CURVES; FLOW AB The superplastic deformation behavior and superplastic forming ability of the Zr41.25Ti13.75Ni10Cu12.5Be22.5 (at.%) bulk metallic glass (BMG) in the supercooled liquid region were investigated. The isothermal tensile results indicate (hat the BMG exhibits a Newtonian behavior at low strain rates but a non-Newtonian behavior at hiqh-strain rates in the initial deformation stage. The maximum elongation reaches as high as 1624% at 656 K. and nanocrystallization was found to occur during the deformation process. Based cm the analysis on tensile deformation. a gear-like micropart is successfully die-forged via a superplastic forgings process. demonstrating that the BMG has excellent workability in the supercooled liquid region. (C) 2004 Elsevier B.V. All rights reserved. C1 Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China. Australian Natl Univ, FEIT, Dept Engn, Canberra, ACT 0200, Australia. Univ Queensland, Sch Engn, St Lucia, Qld 4066, Australia. Univ Queensland, Ctr Microscopy & Microanal, St Lucia, Qld 4066, Australia. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Shen, J (reprint author), Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China. EM junshen@public.hr.hl.cn RI Huang, Yongjiang/D-4809-2009; Zou, Jin/B-3183-2009; Wang, Gang/K-2630-2012; Lu, Zhao-Ping/A-2718-2009 OI Zou, Jin/0000-0001-9435-8043; NR 24 TC 47 Z9 57 U1 3 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD FEB 1 PY 2005 VL 351 IS 3 BP 209 EP 217 DI 10.1016/j.jnoncrysol.2004.11.006 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA 889IV UT WOS:000226437600003 ER PT J AU Golenia, J Prykarpatsky, AK Prykarpatsky, YA AF Golenia, J Prykarpatsky, AK Prykarpatsky, YA TI The structure of Gelfand-Levitan-Marhenko type equations for Delsarte transmutation operators of linear multidimensional differerential operators and operator penicils. Part 1 SO JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS LA English DT Article AB An analog of Gelfand-Levitan-Marchenko integral equations for multi-dimensional Delsarte transmutation operators is constructed by means of studying their differential-geometric structure based on the classical Lagrange identity for a formally conjugated pair of differential operators. An extension of the method for the case of affine pencils of differential operators is suggested. C1 AGH Univ Sci & Technol, Dept Appl Math, PL-30059 Krakow, Poland. NAS, Inst Math, UA-01601 Kiev, Ukraine. AMM Univ Sci & Technol, Dept Appl Math, PL-30059 Krakow, Poland. CDIC, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Golenia, J (reprint author), AGH Univ Sci & Technol, Dept Appl Math, PL-30059 Krakow, Poland. EM napora@wms.mat.agh.edu.pl; prykanat@cybergal.com; yarpry@bnl.gov NR 23 TC 0 Z9 0 U1 0 U2 0 PU NORBERT EULER PI LULEA PA LULEA UNIV TECHNOL, DEPT MATHEMATICS, SE-971 87 LULEA, SWEDEN SN 1402-9251 J9 J NONLINEAR MATH PHY JI J. Nonlinear Math. Phys. PD FEB PY 2005 VL 12 IS 1 BP 73 EP 87 DI 10.2991/jnmp.2005.12.1.7 PG 15 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA 879NP UT WOS:000225724800007 ER PT J AU Ibarra, A Bravo, D Lopez, FJ Garner, FA AF Ibarra, A Bravo, D Lopez, FJ Garner, FA TI High-dose neutron irradiation of MgAl2O4 spinel: effects of post-irradiation thermal annealing on EPR and optical absorption SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID MAGNESIUM-ALUMINATE SPINEL; CATION DISORDER; COLOR-CENTERS; V-CENTERS; CERAMICS; CRYSTALS; OXIDE; LUMINESCENCE; TRANSITIONS; ELECTRON AB Electron paramagnetic resonance (EPR) and optical absorption spectra were measured during thermal annealing of stoichiometric MgAl2O4 spinel that was previously irradiated in the Materials Open Test Assembly in the Fast Flux Test Facility (FFTF/MOTA) at approximate to 680 K to;approximate to 50 dpa. Both F and F+ centres are to persist up to very high temperatures (over 1000K) suggesting the operation of an annealing mechanism controlled by the thermal stability of extended defects. Using X-ray irradiation following the different annealing steps it was shown that an optical absorption band at 37000cm(-1) is related to a sharp EPR band at g = 2.0005 and that the defect causing these effects is the F+ centre. (C) 2004 Elsevier B.V. All rights reserved. C1 CIEMAT Fus Assoc, EURATOM, Inst Invest Basica, E-28040 Madrid, Spain. Univ Autonoma Madrid, Dept Fis Mat, Fac Ciencias C 4, E-28049 Madrid, Spain. Pacific NW Natl Lab, Richland, WA USA. RP Ibarra, A (reprint author), CIEMAT Fus Assoc, EURATOM, Inst Invest Basica, Complutense,22, E-28040 Madrid, Spain. EM angel.ibarra@ciemat.es OI Ibarra, Angel/0000-0002-2420-2497 NR 31 TC 12 Z9 12 U1 3 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 156 EP 162 DI 10.1016/j.jnucmat.2004.09.003 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700004 ER PT J AU Surh, MP Sturgeon, JB Wolfer, WG AF Surh, MP Sturgeon, JB Wolfer, WG TI Radiation swelling behavior and its dependence on temperature, dose rate, and dislocation structure evolution SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID VACANCY CLUSTER EVOLUTION; PRODUCTION BIAS; MICROSTRUCTURAL EVOLUTION; IRRADIATED METALS; VOID NUCLEATION; ALLOYS; INTERSTITIALS; EQUATION; GROWTH AB The microstructural evolution of high-purity steel under irradiation is modeled including a dislocation density that evolves simultaneously with void nucleation and growth. Analysis of the coupled microstructure sinks indicates the evolving dislocation density shapes the rate of void nucleation and the void size distribution so as to enhance steady-swelling behavior at high doses. The incubation dose, to roughly the point of transition to steady-state swelling, is closely related to and even controlled by evolution of the dislocation structure. Incubation is thus a strong function of both the irradiation temperature and the dose rate. The predicted swelling trends versus temperature, flux, and time are closer to experimental results than earlier calculations of void nucleation and growth with a fixed dislocation density. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM jsturgeon@llnl.gov NR 32 TC 7 Z9 7 U1 0 U2 10 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 FEB 1 PY 2005 VL 336 IS 2-3 BP 217 EP 224 DI 10.1016/j.jnucmat.2004.09.016 PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700012 ER PT J AU Hashimoto, N Byun, TS Farrell, K Zinkle, SJ AF Hashimoto, N Byun, TS Farrell, K Zinkle, SJ TI Deformation microstructure of neutron-irradiated pure polycrystalline vanadium SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID AUSTENITIC STAINLESS-STEELS; COPPER SINGLE-CRYSTALS; DEFECT MICROSTRUCTURES; MECHANISMS; METALS; TEMPERATURE; STRENGTH AB The deformation microstructure of irradiated pure vanadium has been investigated by transmission electron microscopy. Dislocation pileup on grain boundaries were observed in the deformed specimens irradiated to 0.012 dpa, indicating that the source of channeling could not be grain boundary only. TEM analysis suggested a relationship between tensile direction and channeling-occurred grain: there is a tendency that directions of the applied stress with greater resolved shear stress lie on the trace containing [0 11] and [112] directions. Channel width is wider in case the angle between tensile direction and dislocation slip direction is close to 45degrees. There is a dose dependence on the correlation between channel width and resolved shear stress, the slope of this correlation decreased with increasing dose. It is suggested that the loss of work hardening capacity in irradiated pure vanadium could be mainly due to dislocation channeling locally formed with high resolved shear stress. (C) 2004 Elsevier B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Hashimoto, N (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, POB 2008,Bldg 4500S,MS 6136, Oak Ridge, TN 37831 USA. EM hashimoton@ornl.gov RI HASHIMOTO, Naoyuki/D-6366-2012; OI Zinkle, Steven/0000-0003-2890-6915 NR 37 TC 17 Z9 17 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 225 EP 232 DI 10.1016/j.jnucmat.2004.09.017 PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700013 ER PT J AU Caro, A Turchi, PEA Caro, M Lopasso, EM AF Caro, A Turchi, PEA Caro, M Lopasso, EM TI Thermodynamics of an empirical potential description of Fe-Cu alloys SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID MONTE-CARLO SIMULATIONS; PRESSURE-VESSEL STEELS; COMPUTER-SIMULATION; ALPHA-IRON; EVOLUTION; METALS; PHASE; SYSTEM AB We apply molecular dynamics simulations based on a classic many-body potential to calculate the thermodynamic properties of Fe-Cu alloys. In a recent publication [E.M. Lopasso, M. Caro, A. Caro, P.E.A. Turchi, Phys. Rev. B 68 (2003) 214205], we report on computational thermodynamics tools applied to the prediction of the phase diagram of such a system. In this work, we calculate all its thermodynamic functions and cast the results in a so-called CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry, www.calphad.org) format to critically compare them with measured and calculated values as described in the CALPHAD database. From this comparison, conclusions are drawn on the power and limitations of empirical potentials to describe the thermodynamics of complex systems. (C) 2004 Elsevier B.V. All rights reserved. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina. RP Caro, A (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. EM caro2@llnl.gov NR 26 TC 23 Z9 23 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 233 EP 242 DI 10.1016/j.jnucmat.2004.09.018 PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700014 ER PT J AU Smith, KL Zaluzec, NJ AF Smith, KL Zaluzec, NJ TI The displacement energies of cations in perovskite (CaTiO(3)) SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID X-RAY-EMISSION; ELECTRON; IRRADIATION; TITANATES; CRYSTALS; ALCHEMI; DAMAGE AB High angular resolution electron channelling X-ray spectroscopy (HARECXS) was used to monitor the intensity ratio of CaKalpha/TiKalpha X-rays emitted by perovskite (CaTiO(3)) as a function of incident electron beam orientation. The collected HARECXS data suggest that the displacement energies of calcium and titanium in perovskite (CaTiO(3)) are 82 I I eV and 69 9 eV, respectively. These values are approximately 40% larger than those currently used to convert ion doses applied to oxides into dpa using SRIM. (C) 2004 Elsevier B.V. All rights reserved. C1 Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Smith, KL (reprint author), Australian Nucl Sci & Technol Org, PMB 1, Menai, NSW 2234, Australia. EM kls@ansto.gov.au NR 25 TC 24 Z9 24 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 261 EP 266 DI 10.1016/j.jnucmat.2004.09.021 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700017 ER PT J AU Cockeram, BV Hollenbeck, JL Snead, LL AF Cockeram, BV Hollenbeck, JL Snead, LL TI Hardness and electrical resistivity of molybdenum in the post-irradiated and annealed conditions SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID NEUTRON-IRRADIATION; TENSILE PROPERTIES; COPPER-ALLOYS; RECOVERY; DAMAGE; TEMPERATURE; DUCTILITY; FRACTURE; DEFECTS; FLUENCE AB Hardness and electrical resistivity were measured for LCAC molybdenum following irradiation at 270-1100degreesC and neutron fluences of 10.5-64.4 x 10(24) n/m(2) (E > 0.1 MeV) to provide a basic assessment of the influence of irradiation and post-irradiation annealing on recovery. Hardness was a more sensitive measure of defect density than electrical resistivity. Irradiation at 935-1100degreesC resulted in little hardening and therefore no recovery was observed. Recovery of the radiation hardening for molybdenum irradiated at 270-605degreesC was observed to begin at Stage V recovery temperatures (approximate to 600degreesC) and was completed at 980degreesC and 1100degreesC, respectively. Isothermal annealing was performed at 700degreesC and Meechan-Brinkman analysis indicated that the activation energy for recovery was 4.07-4.88eV +/- 0.83eV, which is comparable to values for molybdenum self-diffusion. These results indicate that the recovery of molybdenum irradiated at temperatures < 605 degreesC occurs by the solid-state diffusion of vacancies to coarsen the dislocation loops and voids. (C) 2004 Elsevier B.V. All rights reserved. C1 Bechtel Bettis Inc, Bettis Atom Power Lab, W Mifflin, PA 15122 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Cockeram, BV (reprint author), Bechtel Bettis Inc, Bettis Atom Power Lab, POB 79, W Mifflin, PA 15122 USA. EM cockeram@bettis.gov NR 51 TC 17 Z9 17 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 299 EP 313 DI 10.1016/j.jnucmat.2004.10.119 PG 15 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700021 ER PT J AU Sencer, BH Was, GS Yuya, H Isobe, Y Sagisaka, M Garner, FA AF Sencer, BH Was, GS Yuya, H Isobe, Y Sagisaka, M Garner, FA TI Cross-sectional TEM and X-ray examination of radiation-induced stress relaxation of peened stainless steel surfaces SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FISSION-FUSION CORRELATIONS; NEUTRON-SPECTRA; PRESSURE-VESSEL; EMULATION; REACTOR; PROTON; DAMAGE AB Neutron irradiation-induced relaxation was emulated using proton irradiation in order to determine the expected amount of stress relaxation in the peened surface layer of a BWR core shroud during its 40 year lifetime. Samples of 304 SS were shot peened to induce a compressive residual stress, and then irradiated with 3.2 MeV protons at 288 degreesC to four dose levels spanning 0.1-2.0 dpa. One set of specimens was as-peened and a second was pre-injected with 25 appm He. Depth-dependent measurements of internal stress were conducted using successive steps of X-ray line broadening measurement and electropolishing. Results showed that the compressive stress state was progressively relaxed, but was maintained at some level for the majority of the 2 dpa target dose. Helium pre-injection did not significantly affect the relaxation, but the magnitude of thermally-induced relaxation was somewhat greater, although it was observed to be largely a transient, saturable process. A new cross-section technique was developed that allows multiple observations to be made in one specimen at all depths, both in and beyond the peen-damaged range. The as-peened microstructure varies strongly with depth, consisting of deformation twins and dense dislocation networks. The radiation-induced relaxation on the microstructural level was expressed primarily in modification and reduction of the dislocation structure. A comparison was made between the proton-induced relaxation of internal stresses and predictions based on neutron-induced relaxation of externally-applied stresses. The relatively good agreement indicates that proton irradiation is a valid emulation of neutron irradiation for this application. 2004 Elsevier B.V. Ali rights reserved. C1 Los Alamos Natl Lab, MST 8, Los Alamos, NM 87545 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Chubu Elect Co Inc, Midori Ku, Nagoya, Aichi 4598552, Japan. Nucl Fuel Ind Ltd, Osaka 5900491, Japan. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Sencer, BH (reprint author), Los Alamos Natl Lab, MST 8, POB 1663,MS-G755, Los Alamos, NM 87545 USA. EM sencer@lanl.gov; gsw@umich.edu; yuya.hideki@chuden.co.jp; sagisaka@nfi.co.jp; frank.garner@pnl.gov NR 21 TC 4 Z9 4 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD FEB 1 PY 2005 VL 336 IS 2-3 BP 314 EP 322 DI 10.1016/j.jnucmat.2004.10.120 PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA 894US UT WOS:000226817700022 ER PT J AU Benveniste, H Fowler, JS Rooney, W Ding, YS Baumann, AL Moller, DH Du, CW Backus, W Logan, J Carter, P Coplan, JD Biegon, A Rosenblum, L Scharf, B Gatley, JS Volkow, ND AF Benveniste, H Fowler, JS Rooney, W Ding, YS Baumann, AL Moller, DH Du, CW Backus, W Logan, J Carter, P Coplan, JD Biegon, A Rosenblum, L Scharf, B Gatley, JS Volkow, ND TI Maternal and fetal C-11-cocaine uptake and kinetics measured in vivo by combined PET and MRI in pregnant nonhuman primates SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE C-11-cocaine; maternal-fetal exchange; PET; MRI; primate ID DOPAMINE TRANSPORTER; BLOOD-FLOW; COCAINE; PHARMACOKINETICS; DISPOSITION; FETUS; SHEEP; RAT AB Cocaine use during pregnancy has been shown to be deleterious to the infant. This may reflect reduction of flow to placenta or effects on the fetal brain. Methods to assess pharmacokinetics of drugs of abuse in vivo would be useful to investigate the mechanisms underlying the fetal adverse effects. We recently reported that combined MRI and PET technology allows the measurement of radioisotope distribution in maternal and fetal organs in pregnant Macaca radiata. Here, we evaluate the utility of PET to measure the uptake and distribution of C-11-cocaine in the third-trimester fetus. Methods: Six pregnant M. radiata weighing 3.8-9.0 kg were anesthetized and MR images were acquired on a 4-T MRI instrument. In all 6 animals, dynamic PET scans were subsequently acquired using 148-259 MBq of C-11-cocaine. Time-activity curves for both maternal and fetal organs were obtained simultaneously with the pregnant animal positioned transverse in the PET scanner. Distribution volume ratios for maternal and fetal brain for C-11-cocaine were calculated. Results: Coregistration of PET and MR images allowed identification of fetal organs and brain regions and demonstrated that C-11-cocaine or its labeled metabolites readily cross the placenta and accumulate mainly in fetal liver and to a lesser extent in the brain. Time to reach peak C-11 uptake in brain was shorter for the mother than for the fetus. The distribution volume ratios of the maternal striatum were higher than those of the fetus. Placenta was clearly visible on the early time frames and showed more rapid uptake and clearance than other fetal tissues. Conclusion: The pregnant M. radiata model allows the noninvasive measurement of radioisotope pharmacokinetics in maternal and fetal brain and other organs simultaneously. Although the uptake of radioactivity into the fetal brain after the injection of C-11-cocaine is lower and slower than in the maternal brain, a measurable quantity of C-11-cocaine (or its labeled metabolites) accumulates in the fetal brain at early times after injection. The highest accumulation of C-11 occurs in the fetal liver. Rapid radioisotope accumulation and clearance in the placenta offer potential as an input function for kinetic modeling for future studies of binding site availability. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11793 USA. SUNY Stony Brook, Dept Anesthesiol, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Suny Downstate Med Ctr, Dept Psychiat, Brooklyn, NY 11203 USA. NIAAA, NIH, Bethesda, MD USA. RP Benveniste, H (reprint author), Brookhaven Natl Lab, Dept Med, Bldg 490,30 Bell ASve, Upton, NY 11793 USA. EM Benveniste@bnl.gov FU NIDA NIH HHS [1R21DA0015545] NR 23 TC 22 Z9 22 U1 1 U2 1 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 USA SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD FEB PY 2005 VL 46 IS 2 BP 312 EP 320 PG 9 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 896JD UT WOS:000226929500037 PM 15695792 ER PT J AU Kafesaki, M Koschny, T Penciu, RS Gundogdu, TF Economou, EN Soukoulis, CM AF Kafesaki, M Koschny, T Penciu, RS Gundogdu, TF Economou, EN Soukoulis, CM TI Left-handed metamaterials: detailed numerical studies of the transmission properties SO JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS LA English DT Article DE left-handed materials; negative refraction; electromagnetic waves ID LOW-FREQUENCY PLASMONS; SPLIT-RING RESONATORS; MAGNETIC ACTIVITY; FREE-SPACE; REFRACTION AB Using numerical simulation techniques such as the transfer matrix method and the commercially available code Microwave Studio, we study the transmission properties of left-handed (LH) metamaterials and arrays of split-ring resonators (SRRs). We examine the dependence of the transmission through single- and double-ring SRRs on parameters of the system such as the size and shape of the SRRs, size of the unit cell, dielectric properties of the embedding medium where the SRRs reside, and SRR orientation relative to the incoming electromagnetic field. Moreover, we discuss the role of SRRs and wires on the electric cut-off frequency of the combined system of wires and SRRs, as well as the influence of the various system parameters on the LH transmission peak of a medium composed of SRRs and wires. Finally, demonstrating the disadvantages of the currently used SRR designs due to the lack of symmetry, we discuss more symmetric, multigap SRRs, which constitute very promising components for future two-dimensional and three-dimensional LH structures. C1 FORTH, IESL, Iraklion 71110, Crete, Greece. Dept Mat Sci & Technol, Iraklion 71110, Crete, Greece. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Univ Crete, Dept Phys, Iraklion, Greece. RP Soukoulis, CM (reprint author), FORTH, IESL, Box 1527, Iraklion 71110, Crete, Greece. EM soukoulis@ameslab.gov RI Soukoulis, Costas/A-5295-2008; Economou, Eleftherios /E-6374-2010; Kafesaki, Maria/E-6843-2012 OI Kafesaki, Maria/0000-0002-9524-2576 NR 28 TC 79 Z9 83 U1 3 U2 19 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 1464-4258 J9 J OPT A-PURE APPL OP JI J. Opt. A-Pure Appl. Opt. PD FEB PY 2005 VL 7 IS 2 SU S BP S12 EP S22 DI 10.1088/1464-4258/7/2/002 PG 11 WC Optics SC Optics GA 906MX UT WOS:000227647400003 ER PT J AU Wolff, JA Rowe, MC Teasdale, R Gardner, JN Ramos, FC Heikoop, CE AF Wolff, JA Rowe, MC Teasdale, R Gardner, JN Ramos, FC Heikoop, CE TI Petrogenesis of pre-caldera mafic lavas, Jemez Mountains volcanic field (New Mexico, USA) SO JOURNAL OF PETROLOGY LA English DT Article DE Jemez Mountains volcanic field; Rio Grande rift; lithospheric mantle; crustal contamination; trace elements; radiogenic isotopes ID RIO-GRANDE RIFT; ASSIMILATION-FRACTIONAL CRYSTALLIZATION; ENERGY-CONSTRAINED ASSIMILATION; PLUME-LITHOSPHERE INTERACTIONS; SYSTEM MAGMATIC EVOLUTION; NORTHERN NEW-MEXICO; BANDELIER-TUFF; VALLES CALDERA; TRACE-ELEMENT; ISOTOPE DISEQUILIBRIUM AB The Miocene-Quaternary Jemez Mountains volcanic field (JMVF), the site of the Valles caldera, lies at the intersection of the Jemez lineament, a Proterozoic suture, and the Cenozoic Rio Grande rift. Parental magmas are of two types: K-depleted silica-undersaturated, derived from the partial melting of lithospheric mantle with residual amphibole, and tholeiitic, derived from either asthenospheric or lithospheric mantle. Variability in silica-undersaturated basalts reflects contributions of melts derived from lherzolitic and pyroxenitic mantle, representing heterogeneous lithosphere associated with the suture. The K depletion is inherited by fractionated, crustally contaminated derivatives (hawaiites and mugearites), leading to distinctive incompatible trace element signatures, with Th/(Nb,Ta) and La/(Nb,Ta) greater than, but K/(Nb,Ta) similar to, Bulk Silicate Earth. These compositions dominate the mafic and intermediate lavas, and the JMVF is therefore derived largely, and perhaps entirely, from melting of fertile continental Jemez lineament lithosphere during rift-related extension. Significant variations in Pb and Nd isotope ratios (Pb-206/Pb-204 = 17.20-18.93; Nd-143/Nd-144 = 0.51244-0.51272) result from crustal contamination, whereas Sr-87/Sr-86 is low and relatively uniform (0.7040-0.7048). We compare the effects of contamination by low-Sr-87/Sr-86 crust with assimilation of high-Sr-87/Sr-86 granitoid by partial melting, with Sr retained in a feldspathic residue. Both models satisfactorily reproduce the isotopic features of the rocks, but the lack of a measurable Eu anomaly in most JMVF mafic lavas is difficult to reconcile with a major role for residual plagioclase during petrogenesis. C1 Washington State Univ, Dept Geol, Pullman, WA 99164 USA. Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA. Calif State Univ Los Angeles, Dept Geog & Environm Sci, Chico, CA 95929 USA. Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. McMaster Univ, Dept Geol, Hamilton, ON L8S 4M1, Canada. RP Wolff, JA (reprint author), Washington State Univ, Dept Geol, Pullman, WA 99164 USA. EM jawolff@mail.wsu.edu NR 89 TC 17 Z9 17 U1 1 U2 6 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0022-3530 EI 1460-2415 J9 J PETROL JI J. Petrol. PD FEB PY 2005 VL 46 IS 2 BP 407 EP 439 DI 10.1093/petrology/egh082 PG 33 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 891XK UT WOS:000226614100009 ER PT J AU Ross, C Vreeland, V Waite, JH Jacobs, RS AF Ross, C Vreeland, V Waite, JH Jacobs, RS TI Rapid assembly of a wound plug: Stage one of a two-stage wound repair mechanism in the giant unicellular chlorophyte Dasycladus vermicularis (Chlorophyceae) SO JOURNAL OF PHYCOLOGY LA English DT Article DE algae; carbohydrate; coumarin; Dasycladus vermicularis; gelling; lectin; wounding ID ALGA LAMPROTHAMNIUM-PAPULOSUM; SIPHONOUS GREEN-ALGAE; DISINTEGRATED CELLS; TURGOR PRESSURE; FINE-STRUCTURE; BRYOPSIS; CAULERPA; ADHESION; CALCIUM; DIATOM AB Upon injury, selected coenocytic algae are capable of forming temporary wound plugs to prevent detrimental cytoplasmic loss. Wound plugs of Dasycladus vermicularis ([Scropoli] Krasser) were harvested 5 min post-injury and dried. The plug material contained 94% water and can be considered a hydrogel. The gel plug extended several millimeters from the cut end and filled the space inside the cell wall, which resulted from cytoplasmic retraction. Total organic carbon included 55% sugars, 5%-15% protein, and 0.18% lipids. The major sugars were glucose, galactose, mannose, and galacturonic acid. Fluorescein isothiocyanate-lectins specific for these sugars were localized around the plug matrix. Sulfur content calculated as sulfate corresponded to 17% of the carbohydrate by weight, and sulfated material was detected in plugs by Alcian Blue staining. Formation of the initial plug occurred within 1 min of injury and was not significantly perturbed by the addition of ionic, antioxidant, or chelating agents to the seawater medium. However, addition of exogenous D(+)-galactose and D(+)-glucose prevented formation of the nascent gel plug. Wound plugs that were allowed to form from 10 min up until 24 h post-injury were isolated and incubated with selected biochemical probes to identify the biochemical processes involved in plug formation. The operative strategy in Dasycladus to prevent "cytoplasmic hemorrhage" required availability of sequestered carbohydrate and lectin precursor components throughout the thallus for plug assembly. Once the initial assembly had commenced, additional biochemical interactions were initiated (as a function of time) to promote structural integrity. C1 Univ Calif Santa Barbara, Interdept Program Marine Sci, Santa Barbara, CA 93106 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Jacobs, RS (reprint author), Univ Calif Santa Barbara, Interdept Program Marine Sci, Santa Barbara, CA 93106 USA. EM RSJacobs@chem.ucsb.edu RI Ross, Cliff/B-8291-2011 NR 45 TC 14 Z9 16 U1 0 U2 8 PU BLACKWELL PUBLISHING INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD FEB PY 2005 VL 41 IS 1 BP 46 EP 54 DI 10.1111/j.1529-8817.2005.04071.x PG 9 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA 894KT UT WOS:000226791300006 ER PT J AU Igawa, N Taguchi, T Nozawa, T Snead, LL Hinoki, T McLaughlin, JC Katoh, Y Jitsukawa, S Kohyama, A AF Igawa, N Taguchi, T Nozawa, T Snead, LL Hinoki, T McLaughlin, JC Katoh, Y Jitsukawa, S Kohyama, A TI Fabrication of SiC fiber reinforced SiC composite by chemical vapor infiltration for excellent mechanical properties SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT 11th International Conference on High Temperature materials Chemistry (HTMC-XI) CY MAY 19-23, 2003 CL Tokyo, JAPAN DE ceramics; interface; vapour deposition ID FUSION; STRENGTH AB The process optimization for the forced-flow/thermal gradient chemical vapor infiltrated SiC based composites with an advanced SiC fiber(Tyranno SA) was carried out. The new SiC/SiC composites had a lower porosity and the uniform distribution of pores compared with conventional CVI. The uniform interphases between SiC fibers and matrix could be obtained by reversing the gas-flow direction mid-way through the coating process. The tensile strength was slightly increased with the thickness of carbon interphase in the range of 20-250 nm. It was found that the fabric layer orientation and multilayer SiC/C interphase were very effective to improve the mechanical properties. (c) 2004 Elsevier Ltd. All rights reserved. C1 Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan. Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. Kyoto Univ, Uji, Kyoto 6110011, Japan. RP Igawa, N (reprint author), Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan. EM igawa@maico.tokai.jaeri.go.jp NR 8 TC 27 Z9 35 U1 1 U2 8 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 FEB-APR PY 2005 VL 66 IS 2-4 SI SI BP 551 EP 554 DI 10.1016/j.jpcs.2004.06.030 PG 4 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA 905NW UT WOS:000227576500065 ER PT J AU Yoon, JH Wong, CY AF Yoon, JH Wong, CY TI Relativistic generalization of the Gamow factor for fermion pair production or annihilation SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article ID 2-BODY DIRAC EQUATIONS; COVARIANT INTERACTIONS; PARTICLES; THRESHOLD AB In the production or annihilation of a pair of fermions, the initial-state or final-state interactions often lead to significant effects on the reaction cross sections. For Coulomb-type interactions, the Gamow factor has traditionally been used to take into account these effects. However, the Gamow factor needs to be modified when the magnitude of the coupling constant or the relative velocity of two particles increases. We obtain the relativistic generalization of the Gamow factor in terms of the overlap of the Feynman amplitude with the relativistic wavefunction of two fermions with an attractive Coulomb-type interaction. An explicit form of the corrective factor is presented for the spin-singlet S-wave state. While the corrective factor approaches the Gamow factor in the non-relativistic limit, we found that the Gamow factor significantly overestimates the effects when the coupling constant or the velocity is large. C1 Inha Univ, Dept Phys, Inchon, South Korea. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. RP Yoon, JH (reprint author), Inha Univ, Dept Phys, Inchon, South Korea. EM jinyoon@inha.ac.kr; wongc@ornl.gov OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 39 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD FEB PY 2005 VL 31 IS 2 BP 149 EP 160 DI 10.1088/0954-3899/31/2/007 PG 12 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 901NM UT WOS:000227289200007 ER PT J AU Tarver, CM Chidester, SK AF Tarver, CM Chidester, SK TI On the violence of high explosive reactions SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID SOLID EXPLOSIVES; DETONATION-WAVES; IMPACT IGNITION; HMX; PRESSURE AB High explosive reactions can be caused by three general energy deposition processes: impact ignition by frictional and/or shear heating; bulk thermal heating; and shock compression. The violence of the subsequent reaction varies from benign slow combustion to catastrophic detonation of the entire charge. The degree of violence depends on many variables, including the rate of energy delivery, the physical and chemical properties of the explosive, and the strength of the confinement surrounding the explosive charge. The current state of experimental and computer-modeling research on the violence of impact, thermal, and shock-induced reactions is briefly reviewed in this paper C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Tarver, CM (reprint author), Lawrence Livermore Natl Lab, POB 808,L-282, Livermore, CA 94551 USA. EM tarver1@llnl.gov NR 40 TC 11 Z9 12 U1 1 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD FEB PY 2005 VL 127 IS 1 BP 39 EP 48 DI 10.1115/1.1845474 PG 10 WC Engineering, Mechanical SC Engineering GA 917JE UT WOS:000228456100007 ER PT J AU Wang, JA Konduri, S Rao, NSV AF Wang, JA Konduri, S Rao, NSV TI Information fusion technique for evaluating radiation embrittlement of reactor pressure vessel steels SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT ASME Pressure Vessels and Piping Division Conference CY JUL 25-29, 2004 CL San Diego, CA SP ASME ID SENSOR AB A new approach that utilizes the information fusion technique was developed to predict the radiation embrittlement of reactor pressure vessel (RPV) steels. The Charpy transition temperature-shift data is used as the primary index of the RPV radiation embrittlement in this study. Six parameters, Cu, Ni, P neutron fluence, it-radiation time, and irradiation temperature are used in the embrittlement prediction models. The results indicate that this new embrittlement predictor achieved about 66% and 53% reductions, respectively, in the uncertainties for the update General Electric (GE) Boiling Water Reactor (BWR) plate and weld data compared to the Nuclear Regulator, v Commission (NRC) Regulatory Guide 1.99, Rev. 2 (RG1.99/R2). The implications of irradiation temperature effects for the development of radiation embrittlement models are also discussed. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wang, JA (reprint author), Oak Ridge Natl Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA. EM wangja@ornl.gov OI Rao, Nageswara/0000-0002-3408-5941; Wang, Jy-An/0000-0003-2402-3832 NR 21 TC 1 Z9 1 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD FEB PY 2005 VL 127 IS 1 BP 98 EP 104 DI 10.1115/1.1858926 PG 7 WC Engineering, Mechanical SC Engineering GA 917JE UT WOS:000228456100015 ER PT J AU Kratz, DP Mlynczak, MG Mertens, CJ Brindley, H Gordley, LL Martin-Torres, J Miskolczi, FM Turner, DD AF Kratz, DP Mlynczak, MG Mertens, CJ Brindley, H Gordley, LL Martin-Torres, J Miskolczi, FM Turner, DD TI An inter-comparison of far-infrared line-by-line radiative transfer models SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article DE far-infrared; FIRST; line-by-line; inter-comparison ID MOLECULAR SPECTROSCOPIC DATABASE; WATER-VAPOR ABSORPTION; ATMOSPHERIC FLUXES; COOLING RATES; CERES WINDOW; SENSITIVITY; CLOUDS; PARAMETERIZATION; RESOLUTION; RADIANCES AB A considerable fraction (>40%) of the outgoing longwave radiation escapes from the Earth's atmosphere-surface system within a region of the spectrum known as the far-infrared (wave-numbers less than 650 cm(-1)). Dominated by the line and continuum spectral features of the pure rotation band of water vapor, the far-infrared has a strong influence upon the radiative balance of the troposphere, and hence upon the climate of the Earth. Despite the importance of the far-infrared contribution, however, very few spectrally resolved observations have been made of the atmosphere for wave-numbers less than 650 cm(-1). The National Aeronautics and Space Administration (NASA), under its Instrument Incubator Program (IIP), is currently developing technology that will enable routine, space-based spectral measurements of the far-infrared. As part of NASA's IIP, the Far-Infrared Spectroscopy of the Troposphere (FIRST) project is developing an instrument that will have the capability of measuring the spectrum over the range from 100 to 1000 cm(-1) at a resolution of 0.6 cm(-1). To properly analyze the data from the FIRST instrument, accurate radiative transfer models will be required. Unlike the mid-infrared, however, no inter-comparison of codes has been performed for the far-infrared. Thus, in parallel with the development of the FIRST instrument, an investigation has been under-taken to inter-compare radiative transfer models for potential use in the analysis of far-infrared measurements. The initial phase of this investigation has focused upon the inter-comparison of six distinct line-by-line models. The results from this study have demonstrated remarkably good agreement among the models, with differences being of order 0.5%, thereby providing a high measure of confidence in our ability to accurately compute spectral radiances in the far-infrared. (C) 2004 Elsevier Ltd. All rights reserved. C1 NASA, Langley Res Ctr, Radiat & Aerosols Branch, Hampton, VA 23665 USA. Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, London, England. G&A Tech Software Inc, Hampton, VA USA. Analyt Serv & Mat Inc, Hampton, VA USA. Pacific NW Natl Lab, Richland, WA USA. RP Kratz, DP (reprint author), NASA, Langley Res Ctr, Radiat & Aerosols Branch, Hampton, VA 23665 USA. EM david.p.kratz@nasa.gov RI Mlynczak, Martin/K-3396-2012; Martin-Torres, Francisco Javier/G-6329-2015; OI Martin-Torres, Francisco Javier/0000-0001-6479-2236; Brindley, Helen/0000-0002-7859-9207 NR 40 TC 25 Z9 25 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD FEB 1 PY 2005 VL 90 IS 3-4 BP 323 EP 341 DI 10.1016/j.jqsrt.2004.04.006 PG 19 WC Optics; Spectroscopy SC Optics; Spectroscopy GA 864XV UT WOS:000224667500005 ER PT J AU Schroeder, NC Ashley, KR AF Schroeder, NC Ashley, KR TI Separation of non-pertechnetate species from Hanford AN-107 tank waste SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A significant amount of technetium in Hanford waste exists as unidentified, stable, reduced technetium complexes. In order to facilitate the identification of these non-pertechnetate species we have developed a separation scheme which involves three major steps: (1) pretreatment of the sample with Zn2+, (2) cation-exchange to remove gross activity (Sr-90), and (3) size exclusion chromatography to remove residual activity and separate the technetium fractions. Addition of Zn2+ is used to compete for the complexants that bind strontium without perturbing the pH of the sample. Technetium recovery was similar to 50%. One technetium fraction was obtained free of residual gross activity. C1 Los Alamos Natl Lab, C INC, Los Alamos, NM 87545 USA. Texas A&M Univ, Dept Chem, Commerce, TX 75429 USA. RP Schroeder, NC (reprint author), Los Alamos Natl Lab, C INC, POB 1663, Los Alamos, NM 87545 USA. EM nschroeder@lanl.gov NR 12 TC 2 Z9 2 U1 1 U2 1 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 567 EP 573 DI 10.1007/s10967-005-0625-9 PG 7 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100002 ER PT J AU Wolf, SF Tsai, Y AF Wolf, SF Tsai, Y TI Application of ICP-MS and HR-ICP-MS for the characterization of solutions generated from corrosion testing of spent nuclear fuel SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID URANIUM AB The corrosion behavior of spent nuclear fuels under simulated geologically unsaturated and oxidizing conditions are being studied by subjecting both unirradiated and irradiated nuclear fuels to dripping groundwater. Solutions and solid materials are periodically sampled and subsequently analyzed to determine concentrations of groundwater and fuel components in these materials to elucidate corrosion mechanisms. The analyses are performed primarily by inductively coupled plasma mass spectrometry (ICP-MS). For ICP- MS we use the method of internal standardization with direct external calibration with multi-elemental standards possessing natural isotopic abundances for the determination of concentrations groundwater components and indirect instrumental response calibration for the determination of fuel components. Additionally, we are utilizing high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) to enhance our ability to determine concentrations of low-solubility actinides at ultratrace concentrations. C1 Indiana State Univ, Dept Chem, Terre Haute, IN 47809 USA. Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. RP Wolf, SF (reprint author), Indiana State Univ, Dept Chem, Terre Haute, IN 47809 USA. EM wolf@instate.edu NR 11 TC 5 Z9 5 U1 0 U2 3 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 575 EP 579 DI 10.1007/s10967-005-0626-8 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100003 ER PT J AU Wolf, SF Bowers, DL Cunnane, JC AF Wolf, SF Bowers, DL Cunnane, JC TI Analysis of high burnup spent nuclear fuel by ICP-MS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB We have used inductively coupled plasma mass spectrometry (ICP-MS) as the primary tool for determining concentrations of a suite of nuclides in samples excised from high-burnup spent nuclear fuel rods taken from light water nuclear reactors. The complete analysis included the determination of Mo-95, Tc-99, Ru-101, Rh-103, Ag-109, Cs-137, Nd-143, Nd-145, Nd-148, Sm-147, Sm-149, Sm-150, Sm-151, Sm-152, Eu-151, Eu-153, Eu-155, Gd-155, Np-237, U-234, U-235, U-236, U-238, Pu-238, Pu-239, Pu-240, Pu-241, Pu-242, Am-241, Am-242m, and Am-243. The isotopic composition of fissiogenic lanthanide elements was determined using high-performance liquid chromatography (HPLC) with ICP-MS detection. These analytical results allow the determination of fuel burn-up based on Nd-148, Pu, and U content, as well as provide input for storage and disposal criticality calculations. Results show that ICP-MS along with HPLC-ICP-MS are suitable of performing routine determinations of most of these nuclides, with an uncertainty of +/- 10% at the 95% confidence level. C1 Indiana State Univ, Dept Chem, Terre Haute, IN 47809 USA. Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. RP Wolf, SF (reprint author), Indiana State Univ, Dept Chem, Terre Haute, IN 47809 USA. EM wolf@indstate.edu NR 8 TC 30 Z9 30 U1 2 U2 12 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 581 EP 586 DI 10.1007/s10967-005-0627-7 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100004 ER PT J AU Berning, DE Schroeder, NC Chamberlin, RM AF Berning, DE Schroeder, NC Chamberlin, RM TI The autoreduction of pertechnetate in aqueous, alkaline solutions SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID COMPLEXES; WASTE AB The autoreduction of pertechnetate ((TcO4-)-Tc-99) to Tc(IV/V) alkoxide complexes in aqueous, alkaline, solutions is described. Solutions of sodium pertechnetate (0.01M) reacted with nitrogen and oxygen donor ligands (1.0M) in 2M sodium hydroxide. Solutions containing nitrogen donor ligands (e.g., EDTA) showed the initial formation of lightly colored complexes followed by rapid decomposition in air. In contrast, stable, reduced complexes were formed within minutes of mixing pertechnetate with mono- and disaccharides in strong base, as indicated by a persistent color change. Chemical yields of these reactions were determined by thin layer chromatography or paper chromatography and radiochemically assayed with a Bioscan imaging scanner. Analysis by UV-vis spectroscopy suggested that Tc(IV) or Tc(V) complexes were produced, with the oxidation state dependent on the reducing ligand. These experiments may help explain the reduction of pertechnetate to the soluble complexes that have been found in the Hanford nuclear waste tanks. C1 Los Alamos Natl Lab, Div Chem, C INC, Los Alamos, NM 87545 USA. RP Berning, DE (reprint author), Los Alamos Natl Lab, Div Chem, C INC, MS j514, Los Alamos, NM 87545 USA. RI Chamberlin, Rebecca/A-1335-2011 OI Chamberlin, Rebecca/0000-0001-6468-7778 NR 13 TC 4 Z9 4 U1 4 U2 6 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 613 EP 618 DI 10.1007/s10967-005-0632-x PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100009 ER PT J AU Brodzinski, RL Craig, RA Fink, SD Hensley, WK Holt, NO Knopf, MA Lepel, EA Mullen, OD Salaymeh, SR Samuel, TJ Smart, JE Tinker, MR AF Brodzinski, RL Craig, RA Fink, SD Hensley, WK Holt, NO Knopf, MA Lepel, EA Mullen, OD Salaymeh, SR Samuel, TJ Smart, JE Tinker, MR TI An instrument for measuring the TRU concentration in high-level liquid waste SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB An online monitor has been designed, built, and tested that is capable of measuring the residual transuranic concentrations in processed high-level wastes with a detection limit of 370 Bq/ml (10 nCi/ml) is less than six hours. The monitor measures the (alpha,n) neutrons in the presence of gamma-ray fields up to 1 Sv/h (100 R/h). The optimum design was determined by Monte Carlo modeling and then tempered with practical engineering and cost considerations. A multiplicity counter is used in data acquisition to reject the large fraction of coincident and highly variable cosmic-ray-engendered background events and results in an S/N ratio similar to 1. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Brodzinski, RL (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM Ron.Brodzinski@pnl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 625 EP 628 DI 10.1007/s10967-005-0634-8 PG 4 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100011 ER PT J AU Egorov, OB O'Hara, MJ Grate, JW AF Egorov, OB O'Hara, MJ Grate, JW TI Automated radiochemical analysis of total Tc-99 in aged nuclear waste processing streams SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article AB A fully automated analysis procedure and instrument for the measurement of total Tc-99 in aged nuclear waste has been developed. The overall analysis approach is based on a fully automated wet radiochemical analysis method. Microwave-assisted sample oxidation is used prior to a chemical separation step in order to oxidize all of the non-pertechnetate species to pertechnetate. Separation of the pertechnetate from interfering radioactive and stable matrix species is carried out using an anion-exchange column. The separate Tc-99 is quantified using a flow-through solid cell scintillation detector. The instrument is capable of an analysis time of < 13 minute per sample with a detection limit of 2000 dpm/ml. Nuclear waste samples from the Hanford site with a high content of non-pertechnetate species were successfully analyzed using this method. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Egorov, OB (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. EM oleg.egorov@pnl.gov RI O'Hara, Matthew/I-4967-2013; OI O'Hara, Matthew/0000-0003-3982-5897 NR 8 TC 6 Z9 6 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CH JI J. Radioanal. Nucl. Chem. PD FEB PY 2005 VL 263 IS 3 BP 629 EP 633 DI 10.1007/s10967-005-0635-7 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA 910VU UT WOS:000227961100012 ER PT J AU Brosseau, D Kelton, JW Ray, D Edgar, M Chisman, K Emms, B AF Brosseau, D Kelton, JW Ray, D Edgar, M Chisman, K Emms, B TI Testing of thermocline filler materials and molten-salt heat transfer fluids for thermal energy storage systems in parabolic trough power plants SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT International Solar Energy Conference CY JUL 01-14, 2004 CL Portland, OR SP Amer Soc Mech Engineers AB Parabolic trough power systems that utilize concentrated solar energy to generate electricity are a proven technology. Industry and laboratory research efforts are now focusing on integration of thermal energy storage as a viable means to enhance dispatchability of concentrated solar energy. One option to significantly reduce costs is to use thermocline storage systems, low-cost filler materials as the primary thermal storage medium, and molten nitrate salts as the direct heat transfer fluid. Prior thermocline evaluations and thermal cycling tests at the Sandia National Laboratories' National Solar Thermal Test Facility identified quartzite rock and silica sand as potential filler materials. An expanded series of isothermal and thermal cycling experiments were planned and implemented to extend those studies in order to demonstrate the durability of these filler materials in molten nitrate salts over a range of operating temperatures for extended time frames. Upon test completion, careful analyses of filler material samples, as well as the molten salt, were conducted to assess long-term durability and degradation mechanisms in these test conditions. Analysis results demonstrate that the quartzite rock and silica sand appear able to withstand the molten salt environment quite well. No significant deterioration that would impact the performance or operability of a thermocline thermal energy storage system was evident. There re, additional studies of the thermocline concept can continue armed with confidence that appropriate filler materials have been identified for the intended application. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Brosseau, D (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM dabross@sandia.gov; jwkelto@sandia.gov; rmedgar@sandia.gov; kchism@sandia.gov; beemms@sandia.gov NR 8 TC 64 Z9 74 U1 1 U2 31 PU ASME PI NEW YORK PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA SN 0199-6231 EI 1528-8986 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 2005 VL 127 IS 1 BP 109 EP 116 DI 10.1115/1.1824107 PG 8 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA 905OI UT WOS:000227577800016 ER PT J AU Ruby, DS Zaidi, S Narayanan, S Yamanaka, S Balanga, R AF Ruby, DS Zaidi, S Narayanan, S Yamanaka, S Balanga, R TI RIE-texturing of industrial multicrystalline silicon solar cells SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article DE multicrystalline silicon; plasma-texturization; reactive ion etching; reflectance control AB We developed a maskless plasma texturing technique for multicrystalline Si (mc-Si) cells using Reactive Ion Etching (RIE) that results in higher cell performance than that of standard untextured cells. Elimination of plasma damage has been achieved while keeping front reflectance to low levels. Internal quantum efficiencies higher than those on planar and wet-textured cells have been obtained, boosting cell. currents and efficiencies by up to 6% on tricrystalline Si cells. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Gratings Inc, Albuquerque, NM 87107 USA. BP Solar, Frederick, MD 21703 USA. Ebara Solar Inc, Belle Vernon, PA 15012 USA. Shell Solar, Camarillo, CA 93012 USA. RP Ruby, DS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM dsruby@sandia.gov; saleem@uswest.net; Narayam@BP.com; syamanaka@ebarasolar.com; ruben.balanga@solar.Shell.com NR 4 TC 9 Z9 15 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 2005 VL 127 IS 1 BP 146 EP 149 DI 10.1115/1.1756926 PG 4 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA 905OI UT WOS:000227577800021 ER PT J AU Gawlik, K Christensen, C Kutscher, C AF Gawlik, K Christensen, C Kutscher, C TI A numerical and experimental investigation of low-conductivity unglazed, transpired solar air heaters SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID PLATE AB The performance of low-conductivity unglazed, transpired solar collectors was determined numerically and experimentally. The numerical work consisted of modeling flow conditions, plate geometries, and plate conductivities with modified commercial computational fluid dynamics software, and the experimental work compared the performance of two plate geometries made with high and low conductivity materials under a variety of flow conditions. Good agreement was found between the numerical and experimental results. The results showed that for practical low-conductivity materials, performance differed little from the equivalent plate geometry in high-conductivity material. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Gawlik, K (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. EM keith_gawlik@nrel.gov; craig_christensen@nrel.gov; chuck_kutscher@nrel.gov NR 9 TC 22 Z9 22 U1 1 U2 10 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 2005 VL 127 IS 1 BP 153 EP 155 DI 10.1115/1.1823494 PG 3 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA 905OI UT WOS:000227577800023 ER PT J AU Beitz, JV Edelstein, NM Liu, GK Morss, LR AF Beitz, JV Edelstein, NM Liu, GK Morss, LR TI Special issue on f-element spectroscopy and coordination chemistry - Preface SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Editorial Material C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Beitz, JV (reprint author), Argonne Natl Lab, Div Chem, CHM 200,Room M 157,Bldg 200,9700 S Cass Ave, Argonne, IL 60439 USA. EM gkliu@anl.gov NR 0 TC 0 Z9 0 U1 1 U2 4 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 405 EP 405 DI 10.1016/j.jssc.2004.10.001 PG 1 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300001 ER PT J AU Chen, XY Liu, GK AF Chen, XY Liu, GK TI The standard and anomalous crystal-field spectra of Eu3+ SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE crystal-field spectra; Eu3+; charge-transfer states; energy levels; Wybourne-Downer mechanism ID RARE-EARTH IONS; SITE-SELECTIVE SPECTROSCOPY; OPTICAL-TRANSITION INTENSITIES; TRANSFER-LATTICE CLUSTERS; ENERGY-LEVELS; LUMINESCENT PROPERTIES; ABSORPTION SPECTRA; LASER EXCITATION; KRAMERS IONS; C2 SITES AB The crystal-field (CF) spectra of Eu3+ in various inorganic crystalline phases are summarized based on previous investigations. A majority of experimental results can be well interpreted using a standard CF model. However, there are cases in which the spectroscopic properties and fluorescence dynamics of Eu3+ cannot be interpreted within the framework of the standard model. A particularly interesting system is Eu3+ doped into microcrystals of a charge-unbalanced host such as BaFCl. For Eu3+ :BaFCl, one Eu3+ site (Site 1) exhibits normal CF splitting and its energy levels and fluorescence intensity are similar to most other normal systems ever reported. A standard CF fitting has been performed for Site I. However, Eu3+ at a distorted site (Site II) is of anomalous fluorescence dynamics and CF splitting which are significantly different from those of Site I. In the metastable state of D-5(0), Eu3+ ions at Site II also exhibit unusual temperature-dependent lifetime. (c) 2004 Elsevier Inc. All rights reserved. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Chen, XY (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. EM xchen70@anl.gov; gkliu@anl.gov RI Chen, Xueyuan/C-5613-2012 OI Chen, Xueyuan/0000-0003-0493-839X NR 83 TC 127 Z9 127 U1 4 U2 29 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 419 EP 428 DI 10.1016/j.jssc.2004.09.002 PG 10 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300005 ER PT J AU Barandiaran, Z Edelstein, NM Ruiperez, F Ruiprez, F Seijo, L AF Barandiaran, Z Edelstein, NM Ruiperez, F Ruiprez, F Seijo, L TI Bond lengths of 4f(1) and 5d(1) states of Ce3+ hexahalides SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE lanthanide complexes; Ce3+; halides; elpasolites.; bond lengths; excited states; f to d transitions ab initio calculations; solvent effects ID 2ND-ORDER PERTURBATION-THEORY; MODEL POTENTIAL METHOD; SPACE SCF METHOD; CRYSTALLINE ENVIRONMENT; 5D-LEVEL ENERGIES; CORE POTENTIALS; U4+ DEFECTS; SPECTROSCOPY; LANTHANIDE; IONS AB Ligand and solvent effects on the bond length shift experienced by complexes of lanthanide ions upon 4f -> 5d excitation, addressed by means of ab initio embedded cluster calculations, are presented on the clusters (CeF6)(3-), (CeCl6)(3-), and (CeBr6)(3-) in solid elpasolites, in liquid acetonitrile and in vacuo. Previous predictions of bond length shortening upon 4f -> 5d((t2g)) excitation seem to be general and, in particular, chloride and bromide compounds in liquid solution are predicted to be good candidates for excited-state EXAFS measurements of the distortion signs. A quantitative analysis of contributions to the bond length shifts is presented, which shows the importance of ligand field effects and points out insufficiencies in the Judd-Morrison model proposed to account for 4f -> 5d transitions in crystals. (c) 2004 Elsevier Inc. All rights reserved. C1 Univ Autonoma Madrid, Dept Quim, C XIV, E-28049 Madrid, Spain. Univ Autonoma Madrid, Inst Ciencia Mat Nicolas Cabrera, E-28049 Madrid, Spain. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Seijo, L (reprint author), Univ Autonoma Madrid, Dept Quim, C XIV, Campus Cantoblanco, E-28049 Madrid, Spain. EM luis.seijo@uam.es RI Seijo, Luis/G-3872-2011; Ruiperez, Fernando/H-9744-2013; Barandiaran, Zoila/K-5218-2014 OI Seijo, Luis/0000-0002-0621-3694; Ruiperez, Fernando/0000-0002-5585-245X; Barandiaran, Zoila/0000-0001-7166-6844 NR 32 TC 27 Z9 27 U1 1 U2 7 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 464 EP 469 DI 10.1016/j.jssc.2004.09.020 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300011 ER PT J AU Liu, GK AF Liu, GK TI Systematics of f-element crystal-field interaction SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE f-element spectroscopy; ion-ligand interaction; crystal-field theory ID RARE-EARTH IONS; CONFIGURATION INTERACTION; ELECTRONIC-STRUCTURE; ACTINIDE TETRAFLUORIDES; MAGNETIC INTERACTIONS; SINGLE-CRYSTALS; ENERGY LEVELS; SPECTRA; CM3+; SITE AB Systematic behaviors of free-ion and crystal-field interactions are elucidated as a function of N, the number of f electrons in a lanthanide or actinide ion. Experimentally determined values of the free-ion interaction parameters are compared with those calculated based on Hartree-Fock theory. Comparison is also made between the lanthanide series in 4f(N) configurations and the actinide series in 5f(N) configurations. Variation in intra-ionic electrostatic interaction, spin-orbit coupling, and ion ligand interaction is analyzed in comparison between the iso-f-electron lanthanide and actinide ions. Based oil an exchange-charge model of crystal-field theory, crystal-field parameters of the f-element ions in various crystals are summarized in terms of point charge contribution and covalence effect. A systematic correlation is found between the free-ion parameters and the crystal-field strength. Increase of the crystal-field interaction results in a reduction in the free-ion parameters, (c) 2004 Elsevier Inc. All rights reserved. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Liu, GK (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. EM gkliu@anl.gov NR 65 TC 10 Z9 10 U1 1 U2 14 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 489 EP 498 DI 10.1016/j.jssc.2004.09.023 PG 10 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300015 ER PT J AU Assefa, Z Yaita, T Haire, RG Tachimori, S AF Assefa, Z Yaita, T Haire, RG Tachimori, S TI Intramolecular energy transfer in actinide complexes of 6-methyl-2-(2-pyridyl)-benzimidazole (biz): comparison between Cm3+ and Tb3+ systems SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE sensitized emission; energy transfer; actinide spectroscopy; F-elements; photoluminescence ID LANTHANIDE(III) LUMINESCENCE; PHOTOPHYSICAL PROPERTIES; EXCITED-STATES; LIGAND; IONS; PHOTOLUMINESCENCE; MONONUCLEAR; EXCITATION; EU(III); SPECTRA AB Coordination of the 6-methyl-2-(2-pyridyl)-benzimidazole ligand with actinide and lanthanide species can produce enhanced emission due to increased efficiency of intramolecular energy transfer to metal centers. A comparison between the curium and terbium systems indicates that the position of the ligand's triplet state is critical for the enhanced emission. The energy gap between the ligand's triplet state and the acceptor level in curium is about 1000 cm(-1), as compared to a similar to 600 cm(-1) gap in the terbium system. Due to the larger gap, the back transfer with curium is reduced and the radiative yield is significantly higher. The quantum yield for this "sensitized" emission increases to 6.2%, compared to the 0.26% value attained for the metal centered excitation prior to ligand addition. In the terbium case, the smaller donor/acceptor gap enhances back transfer and the energy transfer is less efficient than with the curium system. (c) 2004 Elsevier Inc. All rights reserved. C1 Oak Ridge Natl Lab, Div Chem Sci, Transuranium Chem Grp, Oak Ridge, TN 37831 USA. Japan Atom Energy Res Inst, Dept Mat Sci, Tokai, Ibaraki 31911, Japan. RP Assefa, Z (reprint author), Oak Ridge Natl Lab, Div Chem Sci, Transuranium Chem Grp, MS 6375, Oak Ridge, TN 37831 USA. EM assefaz@ornl.gov NR 25 TC 2 Z9 2 U1 1 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 505 EP 510 DI 10.1016/j.jssc.2004.09.017 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300017 ER PT J AU Beitz, JV Williams, CW Hong, KS Liu, GK AF Beitz, JV Williams, CW Hong, KS Liu, GK TI Heavy metal phosphate nanophases in silica: influence of radiolysis probed via f-electron state properties SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE radiation damage; nanophase; f-element spectroscopy; laser-induced fluorescence; ion-ion energy transfer ID ION-EXCHANGE RESIN; SPECTRA; PHOTOLUMINESCENCE; GLASSES; ORTHOPHOSPHATES; SIZE AB We have assessed the feasibility of carrying out time- and wavelength-resolved laser-induced fluorescence measurements of radiation damage in glassy silica. The consequences of alpha decay of Es-253 in LaPO(4) nanophases embedded in silica were probed based on excitation of 5f states of Cm(3+), Bk(3+), and Es(3+) ions. The recorded emission spectra and luminescence decays showed that alpha decay of Es-253 ejected Bk-249 decay daughter ions into the surrounding silica and created radiation damage within the LaPO(4) nanophases. This conclusion is consistent with predictions of an ion transport code commonly used to model ion implantation. Luminescence from the (6)D(7/2) state of Cm(3+) was Used as an internal standard. Ion-ion energy transfer dominated the dynamics of the observed emitting 5f states and strongly influenced the intensity of observed spectra. In appropriate sample materials, laser-induced fluorescence provides a powerful method for fundamental investigation of alpha-induced radiation damage in silica. (c) 2004 Elsevier Inc. All rights reserved. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Beitz, JV (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. EM beitz@anl.gov NR 28 TC 1 Z9 1 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 511 EP 520 DI 10.1016/j.jssc.2004.09.019 PG 10 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300018 ER PT J AU Conradson, SD Begg, BD Clark, DL den Auwer, C Ding, M Dorhout, PK Espinosa-Faller, FJ Gordon, PL Haire, RG Hess, NJ Hess, RF Keogh, DW Lander, GH Manara, D Morales, LA Neu, MP Paviet-Hartmann, P Rebizant, J Rondinella, VV Runde, W Tait, CD Veirs, DK Villella, PM Wastin, F AF Conradson, SD Begg, BD Clark, DL den Auwer, C Ding, M Dorhout, PK Espinosa-Faller, FJ Gordon, PL Haire, RG Hess, NJ Hess, RF Keogh, DW Lander, GH Manara, D Morales, LA Neu, MP Paviet-Hartmann, P Rebizant, J Rondinella, VV Runde, W Tait, CD Veirs, DK Villella, PM Wastin, F TI Charge distribution and local structure and speciation in the UO2+x and PuO2+x binary oxides for x <= 0.25 SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE speciation; local structure; X-ray absorption fine structure spectroscopy; urania; plutonia; mixed valence actinide oxide; XAFS ID NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; PLUTONIUM DIOXIDE; URANIUM-DIOXIDE; ENVIRONMENT; NEPTUNIUM; SPECTROSCOPY; CHEMISTRY; ACTINIDES; CLUSTERS AB The local structure and chemical speciation of the mixed valence, fluorite-based oxides UO2+x (0.00 <= x <= 0.20) and PuO2+x/PuO2+x-y(OH)(2y)center dot zH(2)O have been determined by U/Pu L-m XAFS spectroscopy. The U spectra indicate (1) that the O atoms are incorporated as oxo groups at short (1.75 angstrom) U-O distances consistent with U(VI) concomitant with a large range of U displacements that reduce the apparent number of U neighbors and (2) that the UO2 fraction remains intact implying that these O defects interact to form Clusters and give the heterogeneous structure consistent with the diffraction patterns. The PuO2+x system, which does not show a separate phase at its x = 0.25 endpoint, also displays (1) oxo groups at longer 1.9 angstrom distances consistent with Pu(V + delta), (2) a multisite Pu-O distribution even when x is close to zero indicative of the formation of stable species with H2O and its hydrolysis products with O2-, and (3) a highly disordered, spectroscopically invisible Pu-Pu component. The structure and bonding in AnO(2+x) are therefore more complicated than have previously been assumed and show both similarities but also distinct differences among the different elements. (c) 2004 Elsevier Inc. All rights reserved. C1 Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Nucl Mat Technol Div, Los Alamos, NM 87545 USA. Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia. CEA, F-30207 Bagnols Sur Ceze, France. Colorado State Univ, Ft Collins, CO 80523 USA. Ctr Marista Estudios Super, Merida, Yucatan, Mexico. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany. RP Conradson, SD (reprint author), Los Alamos Natl Lab, Div Chem, POB 1663, Los Alamos, NM 87545 USA. EM conradson@lanl.gov RI Clark, David/A-9729-2011; Manara, Dario/L-4821-2013; OI Hess, Nancy/0000-0002-8930-9500 NR 44 TC 50 Z9 50 U1 3 U2 37 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 521 EP 535 DI 10.1016/j.jssc.2004.09.029 PG 15 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300019 ER PT J AU Kalvius, GM Dunlap, BD Asch, L Weigel, F AF Kalvius, GM Dunlap, BD Asch, L Weigel, F TI Mossbauer spectroscopy of neptunyl species SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE Mossbauer spectroscopy; neptunium compounds; neptunyl; f-electron structure; bond properties ID ELECTRONIC-STRUCTURE; ALKALINE-SOLUTION; RELAXATION; SPECTRA; NP(VII); IONS AB Systematics of hyperfine parameters from Np-237 Mossbauer resonance data of compounds with Np in a high formal charge state (Np6+, Np7+) are discussed with respect to electronic structure properties. In neptunyl(VI) species, we find a linear correlation between the isomer shift and the strength of quadrupole interaction. Both scale linearly with the actinide-oxygen bond length, stressing the central role of this parameter. Some Compounds show paramagnetic relaxation spectra which makes their analysis difficult. The hyperfine interactions are often not rotational symmetric indicating a deviation from the simple linear O-Np-O configuration. Mossbauer spectra of NpO3 center dot 2H(2)O reveal that this compound should be described as a neptunyl. A comparison or hyperfine parameter systematics indicates that the Np valence electron properties in Np(VII) species are basically similar to those in Np(VI) neptunyls. (c) 2004 Elsevier Inc. All rights reserved. C1 Tech Univ Munich, Dept Phys, D-85747 Garching, Germany. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Kalvius, GM (reprint author), Tech Univ Munich, Dept Phys, James Franck Str, D-85747 Garching, Germany. EM Michael_Kalvius@ph.tum.de NR 18 TC 3 Z9 3 U1 0 U2 7 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 545 EP 553 DI 10.1016/j.jssc.2004.07.025 PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300021 ER PT J AU Penneman, RA Paffett, MT AF Penneman, RA Paffett, MT TI An alternative structure of Pu4O9 ("PuO2.25") incorporating interstitial hydroxyl rather than oxide SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE plutonium oxide; bond orders; actinide valence; EXAFS; XPS ID ELEMENT AB Bond length/bond strength relationships are applied to the Pu4O9 ("PuO2.25") structure proposed by others and support one Pu(V) with a central hydroxyl ion but not a central oxide ion nor formation of Pu(VI). Bond distances and bond strengths are normal for a central ion of unit charge, and reconcile the finding that cell dimensions are so minimally changed from those of PuO2. Substitution of hydroxyl for oxide accounts for the "excess" oxygen content of PuO2.265, yielding PuO2(OH)(0.249). The short range, local order (structure) of the "Pu4O9" entity is alternatively formulated as Pu4O8OH. Published by Elsevier Inc. C1 Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. RP Paffett, MT (reprint author), Los Alamos Natl Lab, Div Chem, MS J964, Los Alamos, NM 87545 USA. EM mtp@lanl.gov NR 13 TC 3 Z9 3 U1 2 U2 15 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 563 EP 566 DI 10.1016/j.jssc.2004.08.022 PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300023 ER PT J AU Sykora, RE Raison, PE Haire, RG AF Sykora, RE Raison, PE Haire, RG TI Self-irradiation induced structural changes in the transplutonium pyrochlores An(2)Zr(2)O(7) (An = Am, Cf) SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE zirconium pyrochlore; actinide; Californium; Americium; X-ray diffraction; radiation stability; phase transformation ID NUCLEAR-WASTE FORM; RADIATION-DAMAGE; STABILIZED ZIRCONIA; PLUTONIUM; GD2TI2O7; TRANSMUTATION; IMPACT AB We have pursued the fundamental chemistry of actinide pyrochlore oxides, An(2)Zr(2)O(7) (An = Am, Cm, Bk, and Cf), using X-ray diffraction as well as optical spectroscopy. One recent facet of our studies has been to observe the structural changes of these materials under self-irradiation as a function of time. It has been reported that both titanate and silicate materials transform from a crystalline to an amorphous state under irradiation. With the Zr-based actinide pyrochlores studied here, we have observed a phase change from a pyrochlore structure to a fluorite-type structure with the retention ofcrystallinity. We focus here on the impact of alpha-radiation (Am-243 and Cf-249), rather than that from neutrons (Cm-248) or beta-radiation (Bk-249), on the An(2)Zr(2)O(7) pyrochlore structures. As a result of this phase change, the local coordination environments of both the actinide and zirconium atoms are altered. We consider a defect/ion deficiency driven mechanism and also address the occurrence of oxidation of the trivalent actinides during the self-irradiation process as being potential mechanisms responsible for the observed phase change. Published by Elsevier Inc. C1 Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. Commiss European Communities, Inst Energy, Joint Res Ctr Petten, NL-1755 ZG Petten, Netherlands. RP Sykora, RE (reprint author), Oak Ridge Natl Lab, Div Chem Sci, POB 2008, Oak Ridge, TN 37831 USA. EM sykorare@ornl.gov NR 29 TC 23 Z9 27 U1 0 U2 6 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 578 EP 583 DI 10.1016/j.jssc.2004.07.037 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300025 ER PT J AU Wilkerson, MP Berg, JM Hopkins, TA Dewey, HJ AF Wilkerson, MP Berg, JM Hopkins, TA Dewey, HJ TI First observation of intra-5f fluorescence from an actinyl center: Np(VI) near-IR emission in Cs2U(Np)O2Cl4 SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE neptunyl; neptunyl lifetime; neptunyl luminescence; neptunyl tetrachloride; near-infrared luminescence; 5f-5f ID ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURE; IONS; TRANSITIONS; CS2NPO2CL4 AB Fluorescence from an excited 5f state of Np(VI) has been observed in the doped impurity system Cs2U(Np)O2Cl4. This is the first intra-5f fluorescence transition that has been detected at room temperature in a condensed-phase system with an actinyl (An(VI)O-2(2+)) core, and it is a rare example of fluorescence of any kind from non-uranyl ions of this type. The emission originates from an excited state approximately 6890 cm(-1) above the ground state. Its emission spectrum and fluorescence lifetime at 295 K will be discussed. Vibronic structure in the emission spectrum is assigned based on comparison with the detailed analysis of the absorption spectra published by Denning et al. (c) 2004 Elsevier Inc. All rights reserved. C1 Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Nucl Mat & Technol Div, Los Alamos, NM USA. RP Wilkerson, MP (reprint author), Los Alamos Natl Lab, Div Chem, POB 1663,Mail Stop J565, Los Alamos, NM 87545 USA. EM mpw@lanl.gov; jberg@lanl.gov; hd@lanl.gov NR 17 TC 17 Z9 17 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 584 EP 588 DI 10.1016/j.jssc.2004.07.049 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300026 ER PT J AU Wyart, JF Blaise, J Worden, EF AF Wyart, JF Blaise, J Worden, EF TI Studies of electronic configurations in the emission spectra of lanthanides and actinides: application to the interpretation of EsI and EsII, predictions for FmI SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE atomic spectra; Racah-Slater theory; hyperfine structure; isotope shift; praseodyinium; plutonium; Californium; Einsteinium; fermium ID TRIPLY IONIZED PRASEODYMIUM; ATOMIC F-SHELL; ENERGY-LEVELS; HYPERFINE-STRUCTURE; TRANSITION-PROBABILITIES; 3-ELECTRON OPERATORS; EXTENDED ANALYSIS; MATRIX-ELEMENTS; PU-I; YTTERBIUM AB The interpretation of the spectra of free atoms and gaseous ions in the 4f(N) and 5f(N) periods became less active after critical compilations of energy levels appeared. However, several spectra are still under study and the application of the Racah-Slater and HFR methods to extended sets of configurations leads to revisions and additions. In doubly charged ions of lanthanides, the treatment of configuration interaction by means of effective parameters and by extension of the basis of states are both important. Concerning actinides, calculations of several observables (Lande factors and isotope shifts in Pu I, hyperfine constants, transition probabilities) prove the quality of eigenfunctions. The classification of Es I and Es II has been extended and radial parameters for fine and hyperfine structures have been derived. Level predictions for the next element fermium are supported by parameter extrapolations. (c) 2004 Elsevier Inc. All rights reserved. C1 Ctr Univ Orsay, CNRS, Aime Cotton Lab, FR-91405 Orsay, France. Lawrence Livermore Natl Lab, Phys & Adv Technol Directorate, Livermore, CA 94550 USA. RP Wyart, JF (reprint author), Ctr Univ Orsay, CNRS, Aime Cotton Lab, Batiment 505, FR-91405 Orsay, France. EM jean-francois.wyart@lac.u-psud.fr NR 42 TC 8 Z9 8 U1 1 U2 8 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD FEB PY 2005 VL 178 IS 2 SI SI BP 589 EP 602 DI 10.1016/j.jssc.204.09.032 PG 14 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA 905JV UT WOS:000227565300027 ER PT J AU Srinivasan, V Cornilsen, BC Weidner, JW AF Srinivasan, V Cornilsen, BC Weidner, JW TI A nonstoichiometric structural model to characterize changes in the nickel hydroxide electrode during cycling SO JOURNAL OF SOLID STATE ELECTROCHEMISTRY LA English DT Article DE nickel hydroxide; EQCM; point defect; nonstoichiometry; side reaction; water content ID QUARTZ-CRYSTAL MICROBALANCE; ATOMIC-FORCE MICROSCOPY; REVERSIBLE POTENTIALS; REDOX BEHAVIOR; FILMS; OXIDE; DEPOSITION; THICKNESS AB Experimental capacities and mass changes are recorded using an electrochemical quartz crystal microbalance during the first nine charge and discharge cycles of nickel hydroxide thin films cycled in 3.0 weight percent ( wt%) potassium hydroxide electrolyte. For the first time, the film capacities have been corrected for the oxygen evolution side reaction, and the data used as input into a point defect-containing structural model to track the changes that occur during short-term cycling. Variations in capacity and mass during formation and charge/discharge cycling are related to changes in the point defect parameters, thus providing a structural origin for the unique experimental variations observed here and often reported in the literature, but previously unexplained. Proton-, potassium-, and water-content vary in the active material during charge/discharge cycling. The observed capacity loss, or "capacity fade,'' is explained by incomplete incorporation of potassium ions in ( or near) the nickel vacancy during charge, as additional protons are then allowed to occupy the vacant lattice site. The increase in water content during reduction parallels the expansion of the electrode that is well known during cycling. This result confirms the origin of the swelling phenomenon as being caused by water incorporation. The model and methodology developed in this paper can be used to correlate electrochemical signatures with material chemical structure. C1 Univ S Carolina, Dept Chem Engn, Ctr Electrochem Engn, Columbia, SC 29208 USA. Michigan Technol Univ, Dept Chem, Houghton, MI 49931 USA. Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RP Weidner, JW (reprint author), Univ S Carolina, Dept Chem Engn, Ctr Electrochem Engn, Columbia, SC 29208 USA. EM weidner@engr.sc.edu OI Weidner, John/0000-0002-3928-9740 NR 27 TC 7 Z9 7 U1 1 U2 7 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 1432-8488 J9 J SOLID STATE ELECTR JI J. Solid State Electrochem. PD FEB PY 2005 VL 9 IS 2 BP 61 EP 76 DI 10.1007/s10008-004-0525-x PG 16 WC Electrochemistry SC Electrochemistry GA 895WW UT WOS:000226895800001 ER PT J AU Ostashev, VE Wilson, DK Liu, LB Aldridge, DF Symons, NP Marlin, D AF Ostashev, VE Wilson, DK Liu, LB Aldridge, DF Symons, NP Marlin, D TI Equations for finite-difference, time-domain simulation of sound propagation in moving inhomogeneous media and numerical implementation SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FLOW; MODEL AB Finite-difference, time-domain (FDTD) calculations are typically performed with partial differential equations that are first order in time. Equation sets appropriate for FDTD calculations in a moving inhomogeneous medium (with an emphasis on the atmosphere) are derived and discussed in this paper. Two candidate equation sets, both derived from linearized equations of fluid dynamics, are proposed. The first, which contains three coupled equations for the sound pressure, vector acoustic velocity, and acoustic density, is obtained without any approximations. The second, which contains two coupled equations for the sound pressure and vector acoustic velocity, is derived by ignoring terms proportional to the divergence of the medium velocity and the gradient of the ambient pressure. It is shown that the second set has the same or a wider range of applicability than equations for the sound pressure that have been previously used for analytical and numerical studies of sound propagation in a moving atmosphere. Practical FDTD implementation of the second set of equations is discussed. Results show good agreement with theoretical predictions of the sound pressure due to a point monochromatic source in a uniform, high Mach number flow and with Fast Field Program calculations of sound propagation in a stratified moving atmosphere. (C) 2005 Acoustical Society of America. C1 NOAA, Environm Technol Lab, Boulder, CO 80305 USA. New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA. USA, Engineer Res & Dev Ctr, Hanover, NH 03755 USA. Sandia Natl Labs, Dept Geophys Technol, Albuquerque, NM 87185 USA. USA, Res Lab, White Sands Missile Range, NM 88002 USA. RP Ostashev, VE (reprint author), NOAA, Environm Technol Lab, Boulder, CO 80305 USA. RI Wilson, D. Keith/A-4687-2012 OI Wilson, D. Keith/0000-0002-8020-6871 NR 36 TC 67 Z9 67 U1 1 U2 17 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 2005 VL 117 IS 2 BP 503 EP 517 DI 10.1121/1.1841531 PG 15 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA 897EN UT WOS:000226986900005 PM 15759672 ER PT J AU Minonzio, JG Prada, C Chambers, D Clorennec, D Fink, M AF Minonzio, JG Prada, C Chambers, D Clorennec, D Fink, M TI Characterization of subwavelength elastic cylinders with the decomposition of the time-reversal operator: Theory and experiment SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DORT METHOD; PHASE-CONJUGATION; SCATTERERS; SEPARATION; SIGNALS; MEDIA AB The decomposition of the time-reversal operator provides information on the scattering medium. It has been shown [Chambers and Gautesen, J. Acoust. Soc. Am. 109, 2616-2624 (2001)] that a small spherical scatterer is in general associated with four eigenvalues and eigenvectors of the time-reversal operator. In this paper, the 2D problem of scattering by an elastic cylinder, imbedded in water, measured by a linear array of transducers is considered. In this case, the array response matrix has three nonzero singular values. Experimental. results are obtained with linear arrays of transducers and for wires of different diameters smaller that the wavelength. It is shown how the singular value distribution and the singular vectors depend on the elastic velocities C-L, C-T, the density p of each wire, and on the density rho(0) and velocity c(0) of the surrounding fluid. These results offer a new perspective towards solution of the inverse problem by determining more than scattering contrast using conventional array processing like that used in medical ultrasonic imaging. (C) 2005 Acoustical Society of America. C1 Univ Denis Diderot, Lab Ondes & Acoust, CNRS, UMR 7587,ESPCI, F-75231 Paris 05, France. Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA. RP Chambers, D (reprint author), Lawrence Livermore Natl Lab, POB 808,L-154, Livermore, CA 94551 USA. RI PRADA, CLAIRE/F-8782-2010; fink, mathias/M-9437-2016; OI Fink, Mathias/0000-0002-8494-7562 NR 20 TC 24 Z9 24 U1 0 U2 0 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 2005 VL 117 IS 2 BP 789 EP 798 DI 10.1121/1.1811471 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA 897EN UT WOS:000226986900032 PM 15759699 ER PT J AU Cadle, SH Belian, TC Black, KN Minassian, F Natarajan, M Tierney, EJ Lawson, DR AF Cadle, SH Belian, TC Black, KN Minassian, F Natarajan, M Tierney, EJ Lawson, DR TI Real-world vehicle emissions: A summary of the 14th Coordinating Research Council On-Road Vehicle Emissions Workshop SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Editorial Material AB The Coordinating Research Council held its 14th Vehicle Emissions Workshop in March 2004, where results of the most recent on-road vehicle emissions research were presented. We summarize ongoing work from researchers who are engaged in improving our understanding of the contribution of mobile sources to ambient air quality and emission inventories. Participants in the workshop discussed efforts to improve mobile source emission models, light- and heavy-duty vehicle emissions measurements, on- and off-road emissions measurements, effects of fuels and lubricating oils on emissions, as well as topics for future research. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Coordinating Res Council, Alpharetta, GA USA. Fed Highway Adm, Washington, DC 20591 USA. S Coast Air Qual Management Dist, Diamond Bar, CA USA. Marathon Ashland Petr, Findlay, OH USA. US EPA, Ann Arbor, MI USA. Gen Motors R&D Ctr, Warren, MI USA. RP Lawson, DR (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. EM doug_lawson@nrel.gov NR 0 TC 3 Z9 3 U1 0 U2 2 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 FEB PY 2005 VL 55 IS 2 BP 130 EP 146 PG 17 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 895FF UT WOS:000226845600001 PM 15796104 ER PT J AU Wang, Y Zhang, LG Fan, Y Lu, JS McCready, DE Wang, C An, LN AF Wang, Y Zhang, LG Fan, Y Lu, JS McCready, DE Wang, C An, LN TI Synthesis, characterization, and optical properties of pristine and doped yttrium aluminum garnet nanopowders SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID TRANSPARENT YAG; POLYCRYSTALLINE; LASER; CERAMICS; PRECIPITATION; PRECURSORS AB Pristine, Si-doped, and Si/Nd-codoped yttrium aluminum garnet (YAG) nanoparticles were synthesized by pyrolysis of complex compounds of aluminum and yttrium with triethanolamine. It was found that the coexistence of Si4+ and Nd3+ increased the solubility of both ions and promoted the formation of YAG phase. Single-phase, nanocrystalline Si/Nd:YAG powders were obtained at calcination temperatures as low as 920 degrees C. The optical behavior of the Si/Nd:YAG nanopowders was similar to that of single-crystal Nd:YAG. C1 Univ Cent Florida, Adv Mat Proc & Anal Ctr, Orlando, FL 32816 USA. Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Lab Excited State Proc, Changchun, Peoples R China. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP An, LN (reprint author), Univ Cent Florida, Adv Mat Proc & Anal Ctr, Orlando, FL 32816 USA. EM lan@mail.ucf.edu NR 13 TC 26 Z9 27 U1 2 U2 14 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43086-6136 USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD FEB PY 2005 VL 88 IS 2 BP 284 EP 286 DI 10.1111/j.1551-2916.2005.00071.x PG 3 WC Materials Science, Ceramics SC Materials Science GA 904PM UT WOS:000227510200004 ER PT J AU Page, JS Bogdanov, B Vilkov, AN Prior, DC Buschbach, MA Tang, K Smith, RD AF Page, JS Bogdanov, B Vilkov, AN Prior, DC Buschbach, MA Tang, K Smith, RD TI Automatic gain control in mass spectrometry using a jet disrupter electrode in an electrodynamic ion funnel SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID STORAGE ASSISTED DISSOCIATION; SPACE-CHARGE; CYCLOTRON RESONANCE; HUMAN PLASMA; ESI-FTICR; INTERFACE; TRAP; ACCUMULATION; CHROMATOGRAPHY; PROTEOMICS AB We report on the use of a jet disrupter electrode in an electrodynamic ion funnel as an electronic valve to regulate the intensity of the ion beam transmitted through the interface of a mass spectrometer in order to perform automatic gain control (AGC). The ion flux is determined by either directly detecting the ion current on the conductance limiting orifice of the ion funnel or using a short mass spectrometry acquisition. Based upon the ion flux intensity, the voltage of the jet disrupter is adjusted to alter the transmission efficiency of the ion funnel to provide a desired ion population to the mass analyzer. Ion beam regulation by an ion funnel is shown to provide control to within a few percent of a targeted ion intensity or abundance. The utility of ion funnel AGC was evaluated using a protein tryptic digest analyzed with liquid chromatography Fourier transform ion cyclotron resonance (LC-FTICR) mass spectrometry. The ion population in the ICR cell was accurately controlled to selected levels, which improved data quality and provided better mass measurement accuracy. (C) 2004 American Society for Mass Spectrometry. C1 Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA. RP Smith, RD (reprint author), Pacific NW Natl Lab, Div Biol Sci, 3335 Q Ave,K8-98,POB 999, Richland, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NCRR NIH HHS [P41 RR018522, RR 12365] NR 31 TC 25 Z9 26 U1 1 U2 14 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD FEB PY 2005 VL 16 IS 2 BP 244 EP 253 DI 10.1016/j.jasms.2004.11.003 PG 10 WC Biochemical Research Methods; Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA 897JI UT WOS:000226999700012 PM 15694774 ER PT J AU Said, A Stevens, DK Sehlke, G AF Said, A Stevens, DK Sehlke, G TI Estimating water budget in a regional aquifer using HSPF-modflow integrated model SO JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION LA English DT Article DE watershed modeling; surface water; ground water; Big Lost River; Snake River; Idaho ID BASIN AB Integrated water resources management is important, especially in watersheds where substantial interactions exist between the ground and surface water sources. This management warrants the need for reliable estimates of both an overall basin water budget and hydrologic fluctuations between ground water and surface water sources. The objectives of this study were to estimate the total water budget and to simulate the effects of the management of water in the Big Lost River Basin in Idaho. The study used the FIPR Hydrological Model (FHM), a hydrological model developed by the University of South Florida for the Florida Institute of Phosphate Research (FIPR). The FHM is an integrated model that simulates the full water budget of the surface and ground water systems. It has two public domain components: Hydrological Simulation Program - FORTRAN (HSPF) and Modular Three-Dimensional Finite-Difference Ground Water Flow Model (MODFLOW). This study quantified the hydrologic fluxes between ground water and surface water and determined a comprehensive and accurate water budget for the Big Lost River. The study showed an annual amount of 10.44 m3/sec leaves the basin and never to return to the system. The study is useful in developing and calculating the annual water budget in the Big Lost River, and this process should be applicable to estimating water budgets in other basins. C1 Univ S Florida, Dept Civil & Environm Engn, Tampa, FL 33620 USA. Utah State Univ, Civil & Environm Dept, Logan, UT 84322 USA. Idaho Natl Lab, Idaho Falls, ID 83415 USA. RP Said, A (reprint author), Univ S Florida, Dept Civil & Environm Engn, 4202 E Fowler Ave,ENB118, Tampa, FL 33620 USA. EM asaid@eng.usf.edu NR 28 TC 14 Z9 14 U1 0 U2 4 PU AMER WATER RESOURCES ASSOC PI MIDDLEBURG PA 4 WEST FEDERAL ST, PO BOX 1626, MIDDLEBURG, VA 20118-1626 USA SN 1093-474X J9 J AM WATER RESOUR AS JI J. Am. Water Resour. Assoc. PD FEB PY 2005 VL 41 IS 1 BP 55 EP 66 DI 10.1111/j.1752-1688.2005.tb03717.x PG 12 WC Engineering, Environmental; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA 916ZL UT WOS:000228425400006 ER PT J AU Pack, MV Armstrong, DJ Smith, AV Aka, G Ferrand, B Pelenc, D AF Pack, MV Armstrong, DJ Smith, AV Aka, G Ferrand, B Pelenc, D TI Measurement of the chi((2)) tensor of GdCa4O(BO3)(3) and YCa4O(BO3)(3) crystals SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID NONLINEAR-OPTICAL PROPERTIES; 2ND-HARMONIC GENERATION; YCOB; ND; COEFFICIENTS; GD AB Using the separated-beam method, we have measured the full second-order nonlinear optical tensors of the crystals GdCa4O(BO3)(3) and YCa4O(BO3)(3). Our d tensors (d = chi((2))/2) differ from those of previous reports but give nearly the same values of d(eff) for type-I doubling of 1064-nm light. However, for other wavelengths or for type-II doubling, our tensors give values for d(eff) distinctly different from the alternative tensors. (C) 2005 Optical Society of America. C1 Sandia Natl Labs, Dept Lasers Opt & Remote Sensing 1112, Albuquerque, NM 87185 USA. Ecole Natl Super Chim Paris, CNRS, UMR 7574, Lab Chim Appl Etat Solide, F-75231 Paris 05, France. CEA, SCMDO CENG, STCO DOPT, Technol Avancees DOPT, F-38054 Grenoble 09, France. RP Smith, AV (reprint author), Sandia Natl Labs, Dept Lasers Opt & Remote Sensing 1112, POB 5800, Albuquerque, NM 87185 USA. EM arlsmit@sandia.gov RI PELENC, Denis/J-5314-2013; AKA, Gerard/P-4818-2016 OI AKA, Gerard/0000-0002-0962-4931 NR 20 TC 27 Z9 27 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD FEB PY 2005 VL 22 IS 2 BP 417 EP 425 DI 10.1364/JOSAB.22.000417 PG 9 WC Optics SC Optics GA 896XM UT WOS:000226967800016 ER PT J AU Kim, YH Grice, WP AF Kim, YH Grice, WP TI Quantum interference with distinguishable photons through indistinguishable pathways SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID PARAMETRIC DOWN-CONVERSION; 2-PHOTON INTERFERENCE; DELAYED CHOICE; ERASER; PAIRS; PUMP AB We report a two-photon quantum interference experiment in which the detected individual photons have quite different properties. The interference is observed even when no effort is made to mask the distinguishing features before the photons are detected. The results can be explained only in terms of indistinguishable two-photon amplitudes. (C) 2005 Optical Society of America. C1 Pohang Univ Sci & Technol, POSTECH, Dept Phys, Pohang 790784, South Korea. Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. RP Pohang Univ Sci & Technol, POSTECH, Dept Phys, Pohang 790784, South Korea. EM yoonho@postech.ac.kr RI Kim, Yoonho/D-2591-2012; Grice, Warren/L-8466-2013; OI Grice, Warren/0000-0003-4266-4692 NR 26 TC 16 Z9 16 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 EI 1520-8540 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD FEB PY 2005 VL 22 IS 2 BP 493 EP 498 DI 10.1364/JOSAB.22.000493 PG 6 WC Optics SC Optics GA 896XM UT WOS:000226967800026 ER PT J AU Kotegawa, H Harada, A Kawasaki, S Kawasaki, Y Kitaoka, Y Haga, Y Yamamoto, E Onuki, Y Itoh, KM Haller, EE Harima, H AF Kotegawa, H Harada, A Kawasaki, S Kawasaki, Y Kitaoka, Y Haga, Y Yamamoto, E Onuki, Y Itoh, KM Haller, EE Harima, H TI Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2: A Ge-73-NQR study under pressure SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE itinerant ferromagnetism; unconventional superconductivity; UGe2; NQR under pressure; first-order phase transition ID HEAVY-FERMION SUPERCONDUCTOR; NUCLEAR-QUADRUPOLE RESONANCE; TRANSITION; ANTIFERROMAGNETISM; FLUCTUATIONS; DESTRUCTION; CRITICALITY; ERRH4B4; SURFACE; ORDER AB We report on the itinerant ferromagnetic superconductor UGe2 through Ge-73-NQR measurements under pressure (P). The P dependence of the NQR spectrum signals a first-order transition from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1) around a critical pressure of P-x similar to 1.2 GPa. The superconductivity exhibiting a maximum value of T-sc = 0.7 K at P-x similar to 1.2 GPa, was found to take place in connection with the P-induced first-order transition. The nuclear spin-lattice relaxation rate 1/T-1 has probed the ferromagnetic transition, exhibiting a peak at the Curie temperature as well as a decrease without the coherence peak below T-sc. These results reveal the uniformly coexistent phase of ferromagnetism and unconventional superconductivity with a line-node gap. We remark on an intimate interplay between the onset of superconductivity and the underlying electronic state for the ferromagnetic phases. C1 Osaka Univ, Grad Sch Engn Sci, Dept Mat Engn Sci, Toyonaka, Osaka 5608531, Japan. Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan. Osaka Univ, Grad Sch Sci, Dept Phys, Toyonaka, Osaka 5600043, Japan. Keio Univ, Dept Appl Phys & Phys Informat, Yokohama, Kanagawa 2238522, Japan. Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Kobe Univ, Fac Sci, Dept Phys, Kobe, Hyogo 6578501, Japan. RP Okayama Univ, Fac Sci, Dept Phys, Okayama 7008530, Japan. RI KAWASAKI, Shinji/B-2586-2011; Itoh, Kohei/C-5738-2014 NR 32 TC 33 Z9 35 U1 2 U2 7 PU PHYSICAL SOC JAPAN PI TOKYO PA YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD FEB PY 2005 VL 74 IS 2 BP 705 EP 711 DI 10.1143/JPSJ.74.705 PG 7 WC Physics, Multidisciplinary SC Physics GA 900NZ UT WOS:000227222900035 ER PT J AU Leslie, KK Marquez-Lago, T Slepoy, A Plimpton, S Oliver, J Steinberg, S AF Leslie, KK Marquez-Lago, T Slepoy, A Plimpton, S Oliver, J Steinberg, S TI Chemcell mathematical modeling defines a biologically relevant lower limit of progesterone receptors in endometrial cancer cells. SO JOURNAL OF THE SOCIETY FOR GYNECOLOGIC INVESTIGATION LA English DT Meeting Abstract CT 52nd Annual Meeting of the Society-for-Gynecologic-Investigation CY MAR 23-26, 2005 CL Los Angeles, CA SP Soc Gynecolog Invest C1 Univ New Mexico, Hlth Sci Ctr, Albuquerque, NM 87131 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1071-5576 J9 J SOC GYNECOL INVEST JI J. Soc. Gynecol. Invest. PD FEB PY 2005 VL 12 IS 2 SU S MA 248 BP 164A EP 164A PG 1 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA 902CN UT WOS:000227329100249 ER PT J AU Androsch, R Wunderlich, B Radusch, HJ AF Androsch, R Wunderlich, B Radusch, HJ TI Analysis of reversible melting in polytetrafluoroethylene SO JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY LA English DT Article DE DSC; polytetrafluoroethylene; reversible and irreversible crystallization and melting; specific reversibility of crystals; TMDSC ID DIFFERENTIAL SCANNING CALORIMETRY; TEMPERATURE-MODULATED DSC; EXTENDED-CHAIN CRYSTALS; X-RAY-SCATTERING; HEAT-CAPACITY; CRYSTALLIZATION BEHAVIOR; DENSITY POLYETHYLENE; LINEAR POLYETHYLENE; SPHERULITIC GROWTH; PHASE-TRANSITIONS AB The reversibility of crystallization and melting of polytetrafluoroethylene (PTFE) has been investigated as function of crystallization conditions and temperature by temperature-modulated differential scanning calorimetry (TMDSC). The total and average specific reversibility of the melt-crystallized PTFE is considerably larger than in case of as-polymerized powder. This experimental observation must be attributed to different coupling between crystallized sequences of the molecules within the globally semi-crystalline superstructure. The crystallinity of as-polymerized PTFE is close to 100%, and the crystals melt in a narrow temperature interval close to the equilibrium melting temperature. Melt-crystallized PTFE, in turn, shows a crystallinity of about only 40% and melts at lower temperatures. The morphology of the melt-crystallized PTFE allows molecule segments to melt and crystallize reversibly as a function of temperature. The extended-chain conformation, evident in as-polymerized powder, inhibits reversible melting due to required molecular nucleation after complete melting of a molecule. The experimental findings are discussed within the framework of a similar investigation on polyethylene of different crystal morphology and support both the concepts of lateral-surface activity and molecular nucleation. C1 Univ Halle Wittenberg, Inst Sci Mat, D-06217 Merseburg, Germany. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. RP Androsch, R (reprint author), Univ Halle Wittenberg, Inst Sci Mat, Geusaer Str, D-06217 Merseburg, Germany. EM rene.androsch@iw.uni-halle.de NR 60 TC 25 Z9 26 U1 2 U2 13 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 1388-6150 J9 J THERM ANAL CALORIM JI J. Therm. Anal. Calorim. PD FEB PY 2005 VL 79 IS 3 BP 615 EP 622 DI 10.1007/s10973-005-0586-9 PG 8 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 910VR UT WOS:000227960800021 ER PT J AU Druckenbrod, DL Shugart, HH Davies, I AF Druckenbrod, DL Shugart, HH Davies, I TI Spatial pattern and process in forest stands within the Virginia piedmont SO JOURNAL OF VEGETATION SCIENCE LA English DT Article DE individual-based model; MUSE; point pattern analysis; resource competition; Ripley's K function; soil moisture ID LEAF-AREA INDEX; MONTPELIER-PLANTATION; LIGHT TRANSMITTANCE; ABOVEGROUND BIOMASS; DECIDUOUS FORESTS; SUCCESSION MODEL; SOIL-MOISTURE; UNITED-STATES; OLD-GROWTH; GAP MODEL AB Question: Underlying ecological processes have often been inferred from the analysis of spatial patterns in ecosystems. Using an individual-based model, we evaluate whether basic assumptions of species' life-history, drought-susceptibility, and shade tolerance generate dynamics that replicate patterns between and within forest stands. Location: Virginia piedmont, USA. Method: Model verification examines the transition in forest composition and stand structure between mesic, intermediate and xeric sites. At each site, tree location, diameter, and status were recorded in square plots ranging from 0.25 to 1.0 ha. Model validation examines the simulated spatial pattern of individual trees at scales of 1-25 m within each forest site using a univariate Ripley's K function. Results: 7512 live and dead trees were surveyed across all sites. All sites exhibit a consistent, significant shift in pattern for live trees by size, progressing from a clumped understorey (trees >= 0.1 m in diameter) to a uniform overstorey (trees > 0.25 m). Simulation results reflect not only the general shift in pattern of trees at appropriate scales within sites, but also the general transition in species composition and stand structure between sites. Conclusions: This shift has been observed in other forest ecosystems and interpreted as a result of competition; however. this hypothesis has seldom been evaluated using simulation models. These results support the hypothesis that forest pattern in the Virginia piedmont results front competition involving species' life-history attributes driven by soil moisture availability between sites and light availability within sites. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA. Australian Natl Univ, Res Sch Biol Sci, Ecosyst Dynam Grp, Canberra, ACT 2601, Australia. RP Druckenbrod, DL (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. EM druckenbrodd@ornl.gov RI Druckenbrod, Daniel/L-4717-2013; Shugart, Herman/C-5156-2009; OI Druckenbrod, Daniel/0000-0003-2998-0017 NR 76 TC 38 Z9 60 U1 3 U2 24 PU OPULUS PRESS UPPSALA AB PI GRANGARDE PA GAMLA VAGEN 40, S-770 13 GRANGARDE, SWEDEN SN 1100-9233 J9 J VEG SCI JI J. Veg. Sci. PD FEB PY 2005 VL 16 IS 1 BP 37 EP 48 DI 10.1111/j.1654-1103.2005.tb02336.x PG 12 WC Plant Sciences; Ecology; Forestry SC Plant Sciences; Environmental Sciences & Ecology; Forestry GA 916NH UT WOS:000228391900005 ER PT J AU Chen, JY Ratera, I Ogletree, DF Salmeron, M Murphy, AR Frechet, JMJ AF Chen, JY Ratera, I Ogletree, DF Salmeron, M Murphy, AR Frechet, JMJ TI Atomic force microscopy study of beta-substituted-T7 oligothiophene films on mica: Mechanical properties and humidity-dependent phases SO LANGMUIR LA English DT Article ID LANGMUIR-BLODGETT-FILMS; POLYMER INTEGRATED-CIRCUITS; FIELD-EFFECT TRANSISTORS; LIGHT-EMITTING-DIODES; ORGANIC THIN-FILMS; CONJUGATED POLYMERS; FRICTIONAL-PROPERTIES; POLY(2,5-THIENYLENE); ELECTROLUMINESCENCE; POLYTHIOPHENES AB The structural and mechanical properties of Langmuir-Blodgett monolayer and multilayer films of 3"",4""-didecyl-5,2';5',2";5",2"';5"',2"";5""2""';5""',2"""-heptathiophene-4"'-acetic acid on mica have been studied by atomic force microscopy (AFM) as a function of humidity, temperature, and applied force. The molecules orient with the carboxylic acid group pointing toward the mica surface and expose the alkyl side chains to the air interface. As the load applied by the AFM tip increases, the film is compressed easily from an initial height of 2 to 1.2 nm. After compression the films can support much higher loads without loss of height. The state of aggregation of the molecules was found to be sensitive to the environmental humidity, which induced reversible changes. Annealing the samples with monolayer or multilayer films resulted in irreversible changes when the temperature exceeded approximately 100 degreesC. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Salmeron, M (reprint author), Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Ratera, Imma/E-2353-2014 OI Ratera, Imma/0000-0002-1464-9789 NR 45 TC 12 Z9 13 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD FEB 1 PY 2005 VL 21 IS 3 BP 1080 EP 1085 DI 10.1021/la040089c PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 891XL UT WOS:000226614200044 PM 15667193 ER PT J AU Gnezdilov V Kurnosov V Yeremenko, A Pashkevich, Y Lemmens, P Tranquada, J Choi, KY Guntherodt, G Nakajima, K AF Gnezdilov, V Kurnosov, V Yeremenko, A Pashkevich, Y Lemmens, P Tranquada, J Choi, KY Guntherodt, G Nakajima, K TI Phonons and magnons in stripe-ordered nickelates. A Raman scattering study SO LOW TEMPERATURE PHYSICS LA English DT Article ID INCOMMENSURATE MAGNETIC CORRELATIONS; CHARGE-TRANSPORT; SPIN; PHASE; LA2NIO4; HOLES; SUPERCONDUCTORS; LA2-XSRXNIO4; FLUCTUATIONS; TRANSITION AB Electronic correlation effects in La(2-x)Sr(x)NiO(4) (x = 1/3 and 0.225) lead to spontaneous phase separation into microscopic spin/charge stripes with commensurate and incommensurate order, respectively. Raman scattering experiments Oil Such single-crystalline materials show a rich phenomenology of phonon and magnon anomalies due to the new, self-organized periodicities. These effects are observable as function of temperature but can also be induced by cooling in seemingly small magnetic fields leading to a reorganization of stripe Structure. (C) 2005 American Institute of Physics. C1 Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine. Natl Acad Sci Ukraine, A Galkin Donetsk Physicotech Inst, UA-83114 Donetsk, Ukraine. MPI FKF, MPI Solid State Res, D-70569 Stuttgart, Germany. Brookhaven Natl Lab, Upton, NY 11973 USA. Rhein Westfal TH Aachen, Inst Phys, D-52056 Aachen, Germany. Univ Tokyo, Neutron Scattering Lab ISSP, Tokai, Ibaraki, Japan. RP Gnezdilov V (reprint author), Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, 47 Lenin Ave, UA-61103 Kharkov, Ukraine. EM kurnosov@ilt.kharkov.ua RI Tranquada, John/A-9832-2009; Lemmens, Peter /C-8398-2009 OI Tranquada, John/0000-0003-4984-8857; Lemmens, Peter /0000-0002-0894-3412 NR 41 TC 1 Z9 1 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1063-777X J9 LOW TEMP PHYS+ JI Low Temp. Phys. PD FEB PY 2005 VL 31 IS 2 BP 154 EP 160 DI 10.1063/1.1820563 PG 7 WC Physics, Applied SC Physics GA 904CX UT WOS:000227474800011 ER PT J AU Sakellariou, D Meriles, CA Martin, RW Pines, A AF Sakellariou, D Meriles, CA Martin, RW Pines, A TI NMR in rotating magnetic fields: magic-angle field spinning SO MAGNETIC RESONANCE IMAGING LA English DT Article; Proceedings Paper CT 7th International Conference on Magnetic Resonance in Porous Media (MRPM7) CY JUL 04-08, 2004 CL Palaiseau, FRANCE DE rotating field; magic-angle spinning; averaging; high resolution; ex situ NMR; HR-MAS; susceptibility broadening ID RESOLUTION H-1-NMR SPECTROSCOPY; RESONANCE; SAMPLES AB Magic-angle sample spinning is one of the cornerstones in high-resolution NMR of solid and semisolid materials. The technique enhances spectral resolution by averaging away rank 2 anisotropic spin interactions, thereby producing isotropic-like spectra with resolved chemical shifts and scalar couplings. In principle, it should be possible to induce similar effects in a static sample if the direction of the magnetic field is varied (e.g., magic-angle rotation of the B-0 field). Here we will review some recent experimental results that show progress toward this goal. Also, we will explore some alternative approaches that may enable the recovery of spectral resolution in cases where the field is rotating off the magic angle. Such a possibility could help mitigate the technical problems that render difficult the practical implementation of this method at moderately strong magnetic fields. (c) 2005 Elsevier Inc. All rights reserved. C1 Lawrence Berkeley Natl Labs, Div Sci Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. CEA Saclay, Serv Chim Mol, DSM, DRECAM, F-91191 Gif Sur Yvette, France. CUNY City Coll, Dept Phys, New York, NY 10031 USA. RP Pines, A (reprint author), Lawrence Berkeley Natl Labs, Div Sci Mat, Berkeley, CA 94720 USA. EM pines@berkeley.edu RI Sakellariou, Dimitrios/F-2846-2010 OI Sakellariou, Dimitrios/0000-0001-7424-5543 NR 16 TC 14 Z9 14 U1 0 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0730-725X J9 MAGN RESON IMAGING JI Magn. Reson. Imaging PD FEB PY 2005 VL 23 IS 2 SI SI BP 295 EP 299 DI 10.1016/j.mri.2004.11.067 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 920AD UT WOS:000228658400030 PM 15833630 ER PT J AU Baroukh, N Ahituv, N Chang, J Shoukry, M Afzal, V Rubin, EM Pennacchio, LA AF Baroukh, N Ahituv, N Chang, J Shoukry, M Afzal, V Rubin, EM Pennacchio, LA TI Comparative genomic analysis reveals a distant liver enhancer upstream of the COUP-TFII gene SO MAMMALIAN GENOME LA English DT Article ID STEROID-RECEPTOR SUPERFAMILY; TRANSCRIPTION FACTORS; IDENTIFICATION; EXPRESSION; MEMBER; LOCALIZATION; MOUSE AB COUP-TFII is a central nuclear hormone receptor that tightly regulates the expression of numerous target lipid metabolism genes in vertebrates. However, it remains unclear how COUP-TFII itself is transcriptionally controlled since studies with its promoter and upstream region fail to recapitulate the gene's liver expression. In an attempt to identify liver enhancers in the vicinity of COUP-TFII, we employed a comparative genomic approach. Initial comparisons between humans and mice of the 3470kb gene-poor region surrounding COUP-TFII revealed 2023 conserved noncoding elements. To oritize a subset of these elements for functional studies, we performed further genomic comparisons with the orthologous pufferfish (Fugu rubripes) locus and uncovered two anciently conserved noncoding sequences (CNS) upstream of COUP-TFII (CNS62kb and CNS-66kb). Testing these two elements using reporter constructs in liver cells (HepG2) revealed that CNS-66kb, but not CNS-62kb, yielded robust in vitro enhancer activity. In addition, an in vivo reporter assay using naked DNA transfer with CNS-66kb linked to luciferase displayed strong reproducible liver expression in adult mice, further supporting its role as a liver enhancer. Together, these studies further support the utility of comparative genomics to uncover gene regulatory sequences based on evolutionary conservation and provide the substrates to better understand the regulation and expression of COUP-TFII. C1 Lawrence Berkeley Natl Lab, Genomics Div, Berkeley, CA 94720 USA. US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA. RP Pennacchio, LA (reprint author), Lawrence Berkeley Natl Lab, Genomics Div, MS 84-171,1 Cyclotron Rd, Berkeley, CA 94720 USA. EM LAPennacchio@lbl.gov OI Ahituv, Nadav/0000-0002-7434-8144 FU NHLBI NIH HHS [HL071954A, HL66681] NR 20 TC 14 Z9 14 U1 1 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0938-8990 J9 MAMM GENOME JI Mamm. Genome PD FEB PY 2005 VL 16 IS 2 BP 91 EP 95 DI 10.1007/s00335-004-2442-9 PG 5 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA 893VT UT WOS:000226749300003 PM 15859353 ER PT J AU Kassner, ME Nemat-Nasser, S Suo, ZG Bao, G Barbour, JC Brinson, LC Espinosa, H Gao, HJ Granick, S Gumbsch, P Kim, KS Knauss, W Kubin, L Langer, J Larson, BC Mahadevan, L Majumdar, A Torquato, S van Swol, F AF Kassner, ME Nemat-Nasser, S Suo, ZG Bao, G Barbour, JC Brinson, LC Espinosa, H Gao, HJ Granick, S Gumbsch, P Kim, KS Knauss, W Kubin, L Langer, J Larson, BC Mahadevan, L Majumdar, A Torquato, S van Swol, F TI New directions in mechanics SO MECHANICS OF MATERIALS LA English DT Article; Proceedings Paper CT Workshop on new Directions in Mechanics CY SEP 07-10, 2003 CL Warrenton, VA SP US Dept Energy, Basic Energy Sci ID MOLECULAR-DYNAMICS SIMULATION; DISLOCATION DYNAMICS; SINGLE-CRYSTALS; STATISTICAL-MECHANICS; DISCRETE DISLOCATION; PLASTIC-DEFORMATION; METAL-SURFACES; THIN-FILMS; SILICON; NANOSTRUCTURES AB The Division of Materials Sciences and Engineering of the US Department of Energy (DOE) sponsored a workshop to identify cutting-edge research needs and opportunities, enabled by the application of theoretical and applied mechanics. The workshop also included input from biochemical, surface science, and computational disciplines, on approaching scientific issues at the nanoscale, and the linkage of atomistic-scale with nano-, meso-, and continuum-scale mechanics. This paper is a summary of the outcome of the workshop, consisting of three main sections, each put together by a team of workshop participants. Section 1 addresses research opportunities that can be realized by the application of mechanics fundamentals to the general area of self-assembly, directed self-assembly, and fluidics. Section 2 examines the role of mechanics in biological, bioinspired, and biohybrid material systems, closely relating to and complementing the material covered in Section 1. In this manner, it was made clear that mechanics plays a fundamental role in understanding the biological functions at all scales, in seeking to utilize biology and biological techniques to develop new materials and devices, and in the general area of bionanotechnology. While direct observational investigations are an essential ingredient of new discoveries and will continue to open new exciting research doors, it is the basic need for controlled experimentation and fundamentally-based modeling and computational simulations that will be truly empowered by a systematic use of the fundamentals of mechanics. Section 3 brings into focus new challenging issues in inelastic deformation and fracturing of materials that have emerged as a result of the development of nanodevices, biopolymers, and hybrid bio-abio systems. Each section begins with some introductory overview comments, and then provides illustrative examples that were presented at the workshop and which are believed to highlight the enabling research areas and, particularly, the impact that mechanics can make in enhancing the fundamental understanding that can lead to new technologies. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Calif San Diego, Ctr Excellence Adv Mat, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA. Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA. Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Georgia Inst Technol, Dept Biomed Engn, Atlanta, GA 30332 USA. Sandia Natl Labs, Dept Nanostruct & Semicond Phys, Albuquerque, NM 87185 USA. Northwestern Univ, Dept Engn Mech, Evanston, IL 60208 USA. Max Planck Inst Met Res, D-70569 Stuttgart, Germany. Univ Illinois, Dept Mat Sci & Engn, Mat Res Lab 106, Urbana, IL 61801 USA. Fraunhofer Inst Mat Mech IWM, Freiburg, Germany. Univ Karlsruhe, Inst Reliabil Construct Units & Syst, Karlsruhe, Germany. Brown Univ, Div Engn, Providence, RI 02912 USA. CALTECH, GALCIT, Pasadena, CA 91125 USA. CNRS, ONERA, Lab Etude Microstruct, F-92322 Chatillon, France. Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. Princeton Univ, Dept Chem, Princeton, NJ 08544 USA. Princeton Univ, Princeton Mat Inst, Princeton, NJ 08544 USA. Univ New Mexico, Dept Chem & Nucl Engn, Adv Mat Lab, Albuquerque, NM 87106 USA. RP Univ Calif San Diego, Ctr Excellence Adv Mat, Dept Mech & Aerosp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA. EM sia@ucsd.edu RI Brinson, L. Catherine/B-6678-2009; Espinosa, Horatio/B-6693-2009; Suo, Zhigang/B-1067-2008; Gao, Huajian/F-9360-2010; Gumbsch, Peter/E-5879-2012; Brinson, L Catherine/B-1315-2013 OI Suo, Zhigang/0000-0002-4068-4844; Gumbsch, Peter/0000-0001-7995-228X; Brinson, L Catherine/0000-0003-2551-1563 NR 124 TC 84 Z9 105 U1 3 U2 52 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 EI 1872-7743 J9 MECH MATER JI Mech. Mater. PD FEB-MAR PY 2005 VL 37 IS 2-3 BP 231 EP 259 DI 10.1016/j.mechmat.2004.04.009 PG 29 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA 870LL UT WOS:000225058500002 ER PT J AU Solanki, K Horstemeyer, MF Baskes, MI Fang, H AF Solanki, K Horstemeyer, MF Baskes, MI Fang, H TI Multiscale study of dynamic void collapse in single crystals SO MECHANICS OF MATERIALS LA English DT Article; Proceedings Paper CT Workshop on new Directions in Mechanics CY SEP 07-10, 2003 CL Warrenton, VA SP US Dept Energy, Basic Energy Sci DE void collapse; EAM; plastic flow; Fcc metals; size scale ID EMBEDDED-ATOM METHOD; MOLECULAR-DYNAMICS; LENGTH SCALE; SIMULATIONS; PLASTICITY; DEFECTS; SOLIDS; METALS; SHEAR AB Molecular. dynamics calculations were performed using embedded atom method (EAM) potentials to study the localization of inelastic flow and crack initiation in fcc single crystal copper and nickel. We compared the atomic scale anisotropic inelastic response of the copper single crystals from EAM to the results of [Philos. Mag. 78(5) (1998) 1151] (experiments and finite element results using single crystal plasticity). Hollow circular cylinders of single crystals were loaded radially with a constant average velocity at a strain rate of 10(9)s(-1), inducing the collapse of the cylinder. Various initial orientations of the lattice are examined to study the localization of flow and crack initiation. Comparisons between EAM, experiments, and finite element simulations were in good agreement with each other illustrating that kinematic and localization effects are invariant to extremely large spatial and temporal regimes. Finally, similar dislocation nucleation patterns, localization sites, and crack initiation sites were observed when comparing copper to nickel. (C) 2004 Elsevier Ltd. All rights reserved. C1 Mississippi State Univ, Ctr Adv Vehicular Syst, Mississippi State, MS 39762 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Fang, H (reprint author), Mississippi State Univ, Ctr Adv Vehicular Syst, POB 9627, Mississippi State, MS 39762 USA. EM hfang@cavs.msstate.edu RI Solanki, Kiran/E-8337-2010; OI Solanki, Kiran/0000-0002-4385-620X; Horstemeyer, Mark/0000-0003-4230-0063 NR 20 TC 19 Z9 21 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 J9 MECH MATER JI Mech. Mater. PD FEB-MAR PY 2005 VL 37 IS 2-3 BP 317 EP 330 DI 10.1016/j.mechmat.2003.08.014 PG 14 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA 870LL UT WOS:000225058500007 ER PT J AU Hasnah, MO Parham, C Pisano, ED Zhong, Z Oltulu, O Chapman, D AF Hasnah, MO Parham, C Pisano, ED Zhong, Z Oltulu, O Chapman, D TI Mass density images from the diffraction enhanced imaging technique SO MEDICAL PHYSICS LA English DT Article DE soft-tissue imaging; radiography; diffraction-enhanced imaging; mammography; x-ray AB Conventional x-ray radiography measures the projected x-ray attenuation of an object. It requires attenuation differences to obtain contrast of embedded features. In general, the best absorption contrast is obtained at x-ray energies where the absorption is high, meaning a high absorbed dose. Diffraction-enhanced imaging (DEI) derives contrast from absorption, refraction, and extinction. The refraction angle image of DEI visualizes the spatial gradient of the projected electron density of the object. The projected electron density often correlates well with the projected mass density and projected absorption in soft-tissue imaging, yet the mass density is not an "energy"-dependent property of the object, as is the case of absorption. This simple difference can lead to imaging with less x-ray exposure or dose. In addition, the mass density image can be directly compared (i.e., a signal-to-noise comparison) with conventional radiography. We present the method of obtaining the mass density image, the results of experiments in which comparisons are made with radiography, and an application of the method to breast cancer imaging. (C) 2005 American Association of Physicists in Medicine. C1 Univ Quatar, Dept Phys, Doha, Qatar. Univ N Carolina, Dept Radiol, Chapel Hill, NC 27599 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. IIT, Chicago, IL 60616 USA. Univ Saskatchewan, Coll Med, Saskatoon, SK S7N 5E5, Canada. RP Hasnah, MO (reprint author), Univ Quatar, Dept Phys, POB 2713, Doha, Qatar. RI Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 FU NIAMS NIH HHS [AR48292] NR 8 TC 16 Z9 18 U1 0 U2 1 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 FEB PY 2005 VL 32 IS 2 BP 549 EP 552 DI 10.1118/1.1852794 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 903JA UT WOS:000227420800029 PM 15789601 ER PT J AU Fort, J Garnich, M Klymyshyn, N AF Fort, J Garnich, M Klymyshyn, N TI Electromagnetic and thermal-flow modeling of a cold-wall crucible induction melter SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article ID FINITE-ELEMENT-ANALYSIS; HEAT AB An approach for modeling cold-wall crucible induction melters is described. Materials in the melt and Inciter are nonferromagnetic. In contrast to other modeling studies reported in the literature. the numerical models use commercial codes. The ANSYS finite-clement code([1]) is employed for electromagnetic field simulations and the STAR-CD finite-volume code([2]) for themal-flow calculations. Results from the electromagnetic calculations in the form of local Joule heat and Lorentz force distributions are included as source terms in the thermal-flow analysis. This loosely coupled approach is made possible by the small variation in temperature and, consequently, small variation in electrical properties across the melt as well as the quasi-steady-state nature of the thermal-flow calculations. A three-dimensional finite-element grid for electromagnetic calculations is adapted to a similar axisymmetric finite-volume grid for data transfer to the thermal-flow model. Results from the electromagnetic model compare well with operational data from a 175-mm-diameter melter. Results from the thermal-flow simulation provide insight about molten metal circulation patterns, temperature variations, and velocity magnitudes. Initial results are included for a model that simulates the formation of a solid (skull) layer on the crucible base and wall. Overall, the modeling approach is shown to produce useful results that relate operational parameters to the physics of steady-state melter operation. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Wyoming, Laramie, WY 82071 USA. RP Fort, J (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM james.fort@pnl.gov NR 22 TC 5 Z9 6 U1 1 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1073-5615 J9 METALL MATER TRANS B JI Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci. PD FEB PY 2005 VL 36 IS 1 BP 141 EP 152 DI 10.1007/s11663-005-0014-3 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 892MU UT WOS:000226655500014 ER PT J AU Feng, H Jones, KW Tomov, S Stewart, B Herzog, GF Schnabel, C Brownlee, DE AF Feng, H Jones, KW Tomov, S Stewart, B Herzog, GF Schnabel, C Brownlee, DE TI Internal structure of type I deep-sea spherules by X-ray computed microtomography SO METEORITICS & PLANETARY SCIENCE LA English DT Article ID COSMIC SPHERULES; ELEMENTAL COMPOSITION; METEORITE; SEDIMENTS; ORIGIN; NICKEL; IRON AB The internal structures of type I spherules (melted micrometeorites rich in iron) have been investigated using synchrotron-based computed microtomography. Variations from sphericity are small-the average ratio of the largest to the smallest semimajor axis is 1.07 &PLUSMN; 0.06. The X-ray tomographs reveal interior cavities, four spherules with metal cores with diameters ranging from 57 to 143 μ m and, in two spherules, high attenuation features thought to be nuggets rich in platinum-group elements. Bulk densities range from 4.2 to 5.9 g/cm(3) and average grain densities from 4.5 to 6.5 (g/cm3) with uncertainties of 10-15%. The average grain densities are those expected for materials containing mostly oxides of iron and nickel. The tomographic density measurements indicate an average void space of 5(-5)(+8)%. The void spaces may be contraction features or the skeletons of bubbles that formed in the molten precursors during atmospheric passage. C1 Rutgers State Univ, Dept Chem & Biol Chem, Piscataway, NJ 08854 USA. Brookhaven Natl Lab, Lab Earth & Environm Sci, Upton, NY 11973 USA. Univ Washington, Dept Astron, Seattle, WA 98915 USA. RP Herzog, GF (reprint author), Rutgers State Univ, Dept Chem & Biol Chem, Piscataway, NJ 08854 USA. EM herzog@rutchem.rutgers.edu NR 36 TC 9 Z9 9 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA SN 1086-9379 J9 METEORIT PLANET SCI JI Meteorit. Planet. Sci. PD FEB PY 2005 VL 40 IS 2 BP 195 EP 206 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 924GW UT WOS:000228968000004 ER PT J AU Lloyd, EL Liu, R Marathe, MV Ramanathan, R Ravi, SS AF Lloyd, EL Liu, R Marathe, MV Ramanathan, R Ravi, SS TI Algorithmic aspects of topology control problems for ad hoc networks SO MOBILE NETWORKS & APPLICATIONS LA English DT Article DE power control; approximation algorithms; topology ID PACKET RADIO NETWORKS; CONNECTIVITY AB Topology control problems are concerned with the assignment of power values to the nodes of an ad hoc network so that the power assignment leads to a graph topology satisfying some specified properties. This paper considers such problems under several optimization objectives, including minimizing the maximum power and minimizing the total power. A general approach leading to a polynomial algorithm is presented for minimizing maximum power for a class of graph properties called monotone properties. The difficulty of generalizing the approach to properties that are not monotone is discussed. Problems involving the minimization of total power are known to be NP-complete even for simple graph properties. A general approach that leads to an approximation algorithm for minimizing the total power for some monotone properties is presented. Using this approach, a new approximation algorithm for the problem of minimizing the total power for obtaining a 2-node-connected graph is developed. It is shown that this algorithm provides a constant performance guarantee. Experimental results from an implementation of the approximation algorithm are also presented. C1 Univ Delaware, Dept Comp & Informat Sci, Newark, DE 19716 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. BBN Technol, Internetwork Res Dept, Cambridge, MA USA. SUNY Albany, Dept Comp Sci, Albany, NY 12222 USA. RP Univ Delaware, Dept Comp & Informat Sci, Newark, DE 19716 USA. EM elloyd@cis.udel.edu; ruliu@cis.udel.edu; marathe@lanl.gov; ramanath@bbn.com; ravi@cs.albany.edu NR 31 TC 83 Z9 84 U1 2 U2 3 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 1383-469X EI 1572-8153 J9 MOBILE NETW APPL JI Mobile Netw. Appl. PD FEB-APR PY 2005 VL 10 IS 1-2 BP 19 EP 34 DI 10.1023/B:MONE.0000048543.95178.f5 PG 16 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Telecommunications SC Computer Science; Telecommunications GA 872DA UT WOS:000225185500003 ER PT J AU Nowak, M Helleboid-Chapman, A Jakel, H Martin, G Duran-Sandoval, D Staels, B Rubin, EM Pennacchio, LA Taskinen, MR Fruchart-Najib, J Fruchart, JC AF Nowak, M Helleboid-Chapman, A Jakel, H Martin, G Duran-Sandoval, D Staels, B Rubin, EM Pennacchio, LA Taskinen, MR Fruchart-Najib, J Fruchart, JC TI Insulin-mediated down-regulation of apolipoprotein A5 gene expression through the phosphatidylinositol 3-kinase pathway: Role of upstream stimulatory factor SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID CORONARY-HEART-DISEASE; MAJOR LATE PROMOTER; PLECKSTRIN HOMOLOGY DOMAIN; PLASMA TRIGLYCERIDE LEVELS; PROTEIN-KINASE PATHWAY; ACID SYNTHASE PROMOTER; TRANSCRIPTION FACTOR; PHOSPHOENOLPYRUVATE CARBOXYKINASE; SIGNAL-TRANSDUCTION; TRANSGENIC MICE AB The apolipoprotein A5 gene (APOA5) has been repeatedly implicated in lowering plasma triglyceride levels. Since several studies have demonstrated that hyperinsulinemia is associated with hypertriglyceridemia, we sought to determine whether APOA5 is regulated by insulin. Here, we show that cell lines and mice treated with insulin down-regulate APOA5 expression in a dose-dependent manner. Furthermore, we found that insulin decreases human APOA5 promoter activity, and subsequent deletion and mutation analyses uncovered a functional E box in the promoter. Electrophoretic mobility shift and chromatin immunoprecipitation assays demonstrated that this APOA5 E box binds upstream stimulatory factors (USFs). Moreover, in transfection studies, USF1 stimulates APOA5 promoter activity, and the treatment with insulin reduced the binding of USF1/USF2 to the APOA5 promoter. The inhibition of the phosphatidylinositol 3-kinase (PI3K) pathway abolished insulin's effect on APOA5 gene expression, while the inhibition of the P70 S6 kinase pathway with rapamycin reversed its effect and increased APOA5 gene expression. Using an oligonucleotide precipitation assay for USF from nuclear extracts, we demonstrate that phosphorylated USF1 fails to bind to the APOA5 promoter. Taken together, these data indicate that insulin-mediated APOA5 gene transtrepression could involve a phosphorylation of USFs through the PI3K and P70 S6 kinase pathways that modulate their binding to the APOA5 E box and results in APOA5 down-regulation. The effect of exogenous hyperinsulinemia in men showed a decrease in the plasma ApoAV level. These results suggest a potential contribution of the APOA5 gene in hypertriglyceridemia associated with hyperinsulinemia. C1 Univ Lille 2, Inst Pasteur, INSERM, Dept Atherosclerose,Ur 545, F-59120 Loos, France. Genfit SA, Loos, France. Lawrence Berkeley Natl Lab, Joint Genome Inst, Berkeley, CA USA. Lawrence Berkeley Natl Lab, Genome Sci Dept, Berkeley, CA USA. Univ Helsinki, Cent Hosp, Dept Internal Med, Helsinki, Finland. RP Fruchart-Najib, J (reprint author), Univ Lille 2, Inst Pasteur, INSERM, Dept Atherosclerose,Ur 545, Parc Eurasante,885 Ave Eugene Avinee, F-59120 Loos, France. EM jfruchart@pharma.univ-lille2.fr OI Staels, Bart/0000-0002-3784-1503 FU NHLBI NIH HHS [HL071954A, HL66681, R01 HL071954, U01 HL066681] NR 64 TC 74 Z9 85 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD FEB PY 2005 VL 25 IS 4 BP 1537 EP 1548 DI 10.1128/MCB.25.4.1537-1548.2005 PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 896AW UT WOS:000226908000027 PM 15684402 ER PT J AU Zhang, H Yi, EC Li, XJ Mallick, P Kelly-Spratt, KS Masselon, CD Camp, DG Smith, RD Kemp, CJ Aebersold, R AF Zhang, H Yi, EC Li, XJ Mallick, P Kelly-Spratt, KS Masselon, CD Camp, DG Smith, RD Kemp, CJ Aebersold, R TI High throughput quantitative analysis of serum proteins using glycopeptide capture and liquid chromatography mass spectrometry SO MOLECULAR & CELLULAR PROTEOMICS LA English DT Article ID HUMAN PLASMA PROTEOME; MOUSE SKIN CARCINOGENESIS; N-LINKED GLYCOPROTEINS; CODED AFFINITY TAGS; 2-DIMENSIONAL ELECTROPHORESIS; STATISTICAL-ANALYSIS; CANCER; IDENTIFICATION; GLYCOSYLATION; CHEMISTRY AB It is expected that the composition of the serum proteome can provide valuable information about the state of the human body in health and disease and that this information can be extracted via quantitative proteomic measurements. Suitable proteomic techniques need to be sensitive, reproducible, and robust to detect potential biomarkers below the level of highly expressed proteins, generate data sets that are comparable between experiments and laboratories, and have high throughput to support statistical studies. Here we report a method for high throughput quantitative analysis of serum proteins. It consists of the selective isolation of peptides that are N-linked glycosylated in the intact protein, the analysis of these now deglycosylated peptides by liquid chromatography electrospray ionization mass spectrometry, and the comparative analysis of the resulting patterns. By focusing selectively on a few formerly N-linked glycopeptides per serum protein, the complexity of the analyte sample is significantly reduced and the sensitivity and throughput of serum proteome analysis are increased compared with the analysis of total tryptic peptides from unfractionated samples. We provide data that document the performance of the method and show that sera from untreated normal mice and genetically identical mice with carcinogen-induced skin cancer can be unambiguously discriminated using unsupervised clustering of the resulting peptide patterns. We further identify, by tandem mass spectrometry, some of the peptides that were consistently elevated in cancer mice compared with their control littermates. C1 Inst Syst Biol, Seattle, WA 98103 USA. Fred Hutchinson Canc Res Ctr, Seattle, WA 98109 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Zurich, Swiss Fed Inst Technol, ETH, CH-8093 Zurich, Switzerland. Univ Zurich, Fac Nat Sci, CH-8093 Zurich, Switzerland. RP Zhang, H (reprint author), Inst Syst Biol, Seattle, WA 98103 USA. EM hzhang@systemsbiology.org RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NCI NIH HHS [R33 CA 93302]; NCRR NIH HHS [RR 18522]; NHLBI NIH HHS [N01 HV 28179] NR 40 TC 157 Z9 162 U1 4 U2 34 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 1535-9476 J9 MOL CELL PROTEOMICS JI Mol. Cell. Proteomics PD FEB PY 2005 VL 4 IS 2 BP 144 EP 155 DI 10.1074/mcp.M400090-MCP200 PG 12 WC Biochemical Research Methods SC Biochemistry & Molecular Biology GA 902UF UT WOS:000227381300004 PM 15608340 ER PT J AU Chakrabarti, S Holub, MA Bhattacharya, P Mishima, TD Santos, MB Johnson, MB Blom, DA AF Chakrabarti, S Holub, MA Bhattacharya, P Mishima, TD Santos, MB Johnson, MB Blom, DA TI Spin-polarized light-emitting diodes with Mn-doped InAs quantum dot nanomagnets as a spin aligner SO NANO LETTERS LA English DT Article ID (GA,MN)AS; TEMPERATURES; ELECTRONICS; INJECTION AB We have fabricated and characterized surface-emitting, spin-polarized light-emitting diodes with a Mn-doped InAs dilute magnetic quantum dot spin-injector and contact region grown by low-temperature molecular beam epitaxy, and an In0.4Ga0.6As quantum dot active region. Energy-dispersive X-ray and electron energy loss spectroscopies performed on individual dots indicate that the Mn atoms incorporate within the dots themselves. Circularly polarized light is observed up to 160 K with a maximum degree of circular polarization of 5.8% measured at 28 K, indicating high-temperature spin injection and device operation. C1 Univ Michigan, Dept Elect Engn & Comp Sci, Solid State Elect Lab, Ann Arbor, MI 48109 USA. Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA. Univ Oklahoma, Ctr Semicond Phys Nanostruct, Norman, OK 73019 USA. Oak Ridge Natl Lab, Met & Ceram Div, Oak Ridge, TN 37831 USA. RP Bhattacharya, P (reprint author), Univ Michigan, Dept Elect Engn & Comp Sci, Solid State Elect Lab, Ann Arbor, MI 48109 USA. EM pkb@eecs.umich.edu RI Santos, Michael/B-5836-2013 NR 15 TC 34 Z9 35 U1 2 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 209 EP 212 DI 10.1021/nl048613n PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500002 PM 15794597 ER PT J AU Stewart, DA Leonard, F AF Stewart, DA Leonard, F TI Energy conversion efficiency in nanotube optoelectronics SO NANO LETTERS LA English DT Article ID FIELD-EFFECT TRANSISTORS; CARBON NANOTUBE; SINGLE; PHOTODETECTORS AB We present theoretical performance estimates for nanotube optoelectronic devices under bias. Current-voltage characteristics of illuminated nanotube p-n junctions are calculated using a self-consistent nonequilibrium Green's function approach. Energy conversion rates reaching tens of percent are predicted for incident photon energies near the band gap energy. In addition, the energy conversion rate increases as the diameter of the nanotube is reduced, even though the quantum efficiency shows little dependence on nanotube radius. These results indicate that the quantum efficiency is not a limiting factor for use of nanotubes in optoelectronics. C1 Sandia Natl Labs, Livermore, CA 94551 USA. RP Stewart, DA (reprint author), Sandia Natl Labs, Livermore, CA 94551 USA. EM stewart@cnf.cornell.edu; fleonar@sandia.gov RI Stewart, Derek/B-6115-2008; OI Stewart, Derek/0000-0001-7355-2605 NR 18 TC 42 Z9 43 U1 2 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 219 EP 222 DI 10.1021/nl048410z PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500004 PM 15794599 ER PT J AU Sonnichsen, C Alivisatos, AP AF Sonnichsen, C Alivisatos, AP TI Gold nanorods as novel nonbleaching plasmon-based orientation sensors for polarized single-particle microscopy SO NANO LETTERS LA English DT Article ID FLUORESCENCE MICROSCOPY; MOLECULES; SPECTROSCOPY; F-1-ATPASE; DIFFUSION; ROTATION AB By monitoring the polarized light scattering from individual gold nanorods in a darkfield microscope, we are able to determine their orientation as a function of time. We demonstrate time resolution of milliseconds and observation times of hours by observing the two-dimensional rotational diffusion of gold rods attached to a glass surface. The observed orientational diffusion shows a fast component of about 60 ms and "sticky times" of seconds. The large signal-to-noise ratio, chemical and photochemical stability, last time response, and small size of these gold nanorods make them an ideal probe for orientation sensing in material science and molecular biology. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Alivisatos, AP (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. EM alivis@berkeley.edu RI Sonnichsen, Carsten/A-5682-2009; Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 28 TC 305 Z9 313 U1 6 U2 71 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 301 EP 304 DI 10.1021/nl048089k PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500020 PM 15794615 ER PT J AU Ramaswamy V Haynes, TE White, CW MoberlyChan, WJ Roorda, S Aziz, MJ AF Ramaswamy, V Haynes, TE White, CW MoberlyChan, WJ Roorda, S Aziz, MJ TI Synthesis of nearly monodisperse embedded nanoparticles by separating nucleation and growth in ion implantation SO NANO LETTERS LA English DT Article ID OPTICAL-PROPERTIES; NANOCRYSTALS; SILICA; SI AB We investigate the formation of nanoparticles of Au in SiO(2) by multiple ion implantation steps and intermediate anneals to isolate nucleation and growth, thereby producing a narrow particle size distribution. We discuss the effects of varying the initial nucleation dose and the growth temperature and establish guidelines for synthesizing nanoparticles with improved size uniformity. By this method, we have obtained a standard deviation of 16% on an average diameter of 1.68 nm, compared to 28% when no attempt is made to isolate nucleation and growth. C1 Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN USA. Harvard Univ, Ctr Imaging & Mesoscale Struct, Cambridge, MA 02138 USA. Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada. RP Aziz, MJ (reprint author), Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. EM maziz@harvard.edu RI Roorda, Sjoerd/N-2604-2014; Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 15 TC 45 Z9 45 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 373 EP 377 DI 10.1021/nl048077z PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500033 PM 15794628 ER PT J AU Buchanan, KS Zhu, XB Meldrum, A Freeman, MR AF Buchanan, KS Zhu, XB Meldrum, A Freeman, MR TI Ultrafast dynamics of a ferromagnetic nanocomposite SO NANO LETTERS LA English DT Article ID MAGNETIZATION DYNAMICS; NANOPARTICLES; MICROSCOPY; FILMS; IRON AB Ensembles of iron nanocrystals up to 25 nm in diameter embedded in SiO2 were found to exhibit an ultrafast magnetic response to a transient out-of-plane magnetic field. The response time varies as a function of in-plane bias magnetic field with the fastest rise times, as short as 26 ps, observed for both zero and high bias fields (140 kA/m). Analytical modeling and micromagnetic simulations confirm that magnetostatic interactions between nanoparticles play an important role in the dynamic response. C1 Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. RP Buchanan, KS (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. EM buchanan@anl.gov RI Freeman, Mark/E-4609-2013; OI Buchanan, Kristen/0000-0003-0879-0038 NR 31 TC 30 Z9 30 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 383 EP 387 DI 10.1021/nl0482377 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500035 PM 15794630 ER PT J AU Hor, YS Xiao, ZL Welp, U Ito, Y Mitchell, JF Cook, RE Kwok, WK Crabtree, GW AF Hor, YS Xiao, ZL Welp, U Ito, Y Mitchell, JF Cook, RE Kwok, WK Crabtree, GW TI Nanowires and nanoribbons of charge-density-wave conductor NbSe3 SO NANO LETTERS LA English DT Article ID TIME-DEPENDENT IMAGES; X-RAY; ELECTRON-DIFFRACTION; TRANSPORT-PROPERTIES; CRYSTALS; GROWTH; PHASE; TRANSITION; MICROSCOPY; NIOBIUM AB We report synthesis of nanowires and nanoribbons of the charge-density-wave conductor NbSe3 through direct reaction of Nb and Se powders. The transverse dimension of the obtained nanostructures, as identified with scanning/transmission electron microscopy, ranges from 20 to 700 nm. X-ray and selected area electron diffraction analyses indicate that these nanowires and nanoribbons are single crystalline. Four-probe resistivity measurements confirm the expected charge-density-wave transitions, and furthermore, we find significant enhancement in the depinning threshold fields, which we attribute to a confinement effect. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA. RP Xiao, ZL (reprint author), Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. EM xiao@anl.gov NR 38 TC 30 Z9 30 U1 2 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD FEB PY 2005 VL 5 IS 2 BP 397 EP 401 DI 10.1021/nl0480722 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 898UA UT WOS:000227100500037 PM 15794632 ER PT J AU Rivera, JL McCabe, C Cummings, PT AF Rivera, JL McCabe, C Cummings, PT TI The oscillatory damped behaviour of incommensurate double-walled carbon nanotubes SO NANOTECHNOLOGY LA English DT Article ID MOLECULAR-DYNAMICS ALGORITHM; CHEMICAL-VAPOR-DEPOSITION; INTERFACIAL CHARACTERISTICS; ATOMISTIC SIMULATIONS; LOW-FRICTION; BEARINGS; CRYSTALS; STRENGTH; SYMMETRY; SYSTEMS AB The mechanical properties of sliding carbon nanotubes have been investigated by classical molecular dynamics simulations in the canonical ensemble. In particular we have studied damped oscillations in the separation between the centres of mass of the inner and outer tubes of double-walled carbon nanotubes (DWCN). Incommensurate DWCNs forming (7, 0)@(9, 9) structures were simulated for systems at 298.15 K with axial lengths from 12.21 to 98.24 tim. The oscillations exhibited frequencies in the range of gigahertz with the frequency decreasing as the length of the system increases. The time until oscillations become negligible exhibited a nearly linear dependence on the length of the system. Two macroscopic models were developed in order to understand the forces involved in terms of macroscopic properties like friction and shear. The first model considered constant restoring forces during the whole event, while in the second the value of these constant restoring forces depended on the initial conditions of each oscillation. Both models reproduced the oscillations quite well, while the second model allows us to predict the dynamic shear strength in terms of the axial length of the system for tubes with the same diameters. The calculated dynamic shear strength exhibited monotonic behaviour with an inverse dependence on the length of the system. For systems with unequal axial lengths, the restoring force, which drives the oscillation, is reduced compared to the system with equal lengths, regardless of whether the outer nanotube is longer or shorter. C1 Univ Michoacana, Dept Chem Engn, Colonia Ctr 403, Morelia 58000, Michoacan, Mexico. Vanderbilt Univ, Dept Chem Engn, Nashville, TN 37235 USA. Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA. RP Cummings, PT (reprint author), Univ Michoacana, Dept Chem Engn, Colonia Ctr 403, Morelia 58000, Michoacan, Mexico. EM peter.t.cummings@vanderbilt.edu RI Rivera, Jose/A-2795-2008; McCabe, Clare/I-8017-2012; Cummings, Peter/B-8762-2013 OI Rivera, Jose/0000-0002-6985-7841; McCabe, Clare/0000-0002-8552-9135; Cummings, Peter/0000-0002-9766-2216 NR 54 TC 95 Z9 96 U1 0 U2 11 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD FEB PY 2005 VL 16 IS 2 BP 186 EP 198 DI 10.1088/0957-4484/16/2/003 PG 13 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA 903EL UT WOS:000227408200004 PM 21727422 ER PT J AU Li, HY Pellegrini, M Eisenberg, D AF Li, HY Pellegrini, M Eisenberg, D TI Detection of parallel functional modules by comparative analysis of genome sequences SO NATURE BIOTECHNOLOGY LA English DT Article ID RNA POLYMERASE-II; ESCHERICHIA-COLI; DROSOPHILA-MELANOGASTER; SALMONELLA-TYPHIMURIUM; ANTIMICROBIAL PEPTIDES; CAENORHABDITIS-ELEGANS; PROTEIN INTERACTIONS; GENE DUPLICATIONS; BINDING-PROTEIN; LARGEST SUBUNIT AB Parallel functional modules are separate sets of proteins in an organism that catalyze the same or similar biochemical reactions but act on different substrates or use different cofactors. They originate by gene duplication during evolution. Parallel functional modules provide versatility and complexity to organisms, and increase cellular flexibility and robustness. We have developed a four-step approach for genome-wide discovery of parallel modules from protein functional linkages. From ten genomes, we identified 37 cellular systems that consist of parallel functional modules. This approach recovers known parallel complexes and pathways, and discovers new ones that conventional homology-based methods did not previously reveal, as illustrated by examples of peptide transporters in Escherichia coli and nitrogenases in Rhodopseudomonas palustris. The approach untangles intertwined functional linkages between parallel functional modules and expands our ability to decode protein functions from genome sequences. C1 Univ Calif Los Angeles, Howard Hughes Med Inst, UCLA DOE Inst Genom & Proteom, Dept Chem & Biochem, Los Angeles, CA 90095 USA. RP Eisenberg, D (reprint author), Univ Calif Los Angeles, Howard Hughes Med Inst, UCLA DOE Inst Genom & Proteom, Dept Chem & Biochem, Box 951570, Los Angeles, CA 90095 USA. EM david@mbi.ucla.edu NR 51 TC 19 Z9 19 U1 0 U2 2 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1087-0156 J9 NAT BIOTECHNOL JI Nat. Biotechnol. PD FEB PY 2005 VL 23 IS 2 BP 253 EP 260 DI 10.1038/nbt1065 PG 8 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 894NC UT WOS:000226797600034 PM 15696156 ER PT J AU Larsson, P Oyston, PCF Chain, P Chu, MC Duffield, M Fuxelius, HH Garcia, E Halltorp, G Johansson, D Isherwood, KE Karp, PD Larsson, E Liu, Y Michell, S Prior, J Prior, R Malfatti, S Sjostedt, A Svensson, K Thompson, N Vergez, L Wagg, JK Wren, BW Lindler, LE Andersson, SGE Forsman, M Titball, RW AF Larsson, P Oyston, PCF Chain, P Chu, MC Duffield, M Fuxelius, HH Garcia, E Halltorp, G Johansson, D Isherwood, KE Karp, PD Larsson, E Liu, Y Michell, S Prior, J Prior, R Malfatti, S Sjostedt, A Svensson, K Thompson, N Vergez, L Wagg, JK Wren, BW Lindler, LE Andersson, SGE Forsman, M Titball, RW TI The complete genome sequence of Francisella tularensis, the causative agent of tularemia SO NATURE GENETICS LA English DT Article ID CHEMICALLY DEFINED MEDIUM; PASTEURELLA-TULARENSIS; INTRACELLULAR INFECTION; METABOLIC PATHWAYS; GROWTH INITIATION; VIRULENCE FACTORS; MACROPHAGES; GENE; IDENTIFICATION; ESCAPE AB Francisella tularensis is one of the most infectious human pathogens known. In the past, both the former Soviet Union and the US had programs to develop weapons containing the bacterium. We report the complete genome sequence of a highly virulent isolate of F. tularensis (1,892, 819 bp). The sequence uncovers previously uncharacterized genes encoding type IV pili, a surface polysaccharide and iron-acquisition systems. Several virulence-associated genes were located in a putative pathogenicity island, which was duplicated in the genome. More than 10% of the putative coding sequences contained insertion-deletion or substitution mutations and seemed to be deteriorating. The genome is rich in IS elements, including IS630 Tc-1 mariner family transposons, which are not expected in a prokaryote. We used a computational method for predicting metabolic pathways and found an unexpectedly high proportion of disrupted pathways, explaining the fastidious nutritional requirements of the bacterium. The loss of biosynthetic pathways indicates that F. tularensis is an obligate host-dependent bacterium in its natural life cycle. Our results have implications for our understanding of how highly virulent human pathogens evolve and will expedite strategies to combat them. C1 Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. Def Sci & Technol Lab, Salisbury SP4 0JQ, Wilts, England. Swedish Def Res Agcy, SE-90182 Umea, Sweden. Ctr Dis Control & Prevent, Div Vector Borne Infect Dis, Ft Collins, CO USA. Univ Uppsala, Dept Mol Evolut, S-75236 Uppsala, Sweden. SRI Int, Bioinformat Res Grp, Menlo Pk, CA 94025 USA. Walter Reed Army Inst Res, Silver Spring, MD 20910 USA. Umea Univ, Dept Clin Microbiol, SE-90185 Umea, Sweden. Wellcome Trust Sanger Inst, Cambridge CB10 1SA, England. Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England. RP Titball, RW (reprint author), Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. EM rtitball@dstl.gov.uk RI chain, patrick/B-9777-2013; Forsman, Mats/A-1426-2016; OI Forsman, Mats/0000-0002-4466-5325; Sjostedt, Anders/0000-0002-0768-8405; Karp, Peter/0000-0002-5876-6418 NR 50 TC 292 Z9 597 U1 2 U2 19 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1061-4036 J9 NAT GENET JI Nature Genet. PD FEB PY 2005 VL 37 IS 2 BP 153 EP 159 DI 10.1038/ng1499 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA 893AB UT WOS:000226690100021 PM 15640799 ER PT J AU Hennig, RG Trinkle, DR Bouchet, J Srinivasan, SG Albers, RC Wilkins, JW AF Hennig, RG Trinkle, DR Bouchet, J Srinivasan, SG Albers, RC Wilkins, JW TI Impurities block the alpha to omega martensitic transformation in titanium SO NATURE MATERIALS LA English DT Article ID TRANSITION; PSEUDOPOTENTIALS; ZIRCONIUM; PRESSURE; METALS; PHASE AB Impurities control phase stability and phase transformations in natural and man-made materials, from shape-memory alloys(1) to steel(2) to planetary cores(3). Experiments and empirical databases are still central to tuning the impurity effects. What is missing is a broad theoretical underpinning. Consider, for example, the titanium martensitic transformations: diffusionless structural transformations proceeding near the speed of sound(2). Pure titanium transforms from ductile a to brittle. at 9 GPa, creating serious technological problems for beta-stabilized titanium alloys. Impurities in the titanium alloys A-70 and Ti-6Al-4V (wt%) suppress the transformation up to at least 35 GPa, increasing their technological utility as lightweight materials in aerospace applications. These and other empirical discoveries in technological materials call for broad theoretical understanding. Impurities pose two theoretical challenges: the effect on the relative phase stability, and the energy barrier of the transformation. Ab initio methods(4,5) calculate both changes due to impurities. We show that interstitial oxygen, nitrogen and carbon retard the transformation whereas substitutional aluminium and vanadium influence the transformation by changing the d-electron concentration(6). The resulting microscopic picture explains the suppression of the transformation in commercial A-70 and Ti-6Al-4V alloys. In general, the effect of impurities on relative energies and energy barriers is central to understanding structural phase transformations. C1 Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hennig, RG (reprint author), Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA. EM rhennig@mps.ohio-state.edu RI Hennig, Richard/A-2978-2008; Trinkle, Dallas/E-6609-2010 OI Hennig, Richard/0000-0003-4933-7686; NR 23 TC 97 Z9 97 U1 11 U2 68 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 1476-1122 J9 NAT MATER JI Nat. Mater. PD FEB PY 2005 VL 4 IS 2 BP 129 EP 133 DI 10.1038/nmat1292 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 893VU UT WOS:000226749400014 PM 15665839 ER PT J AU Urbich, C Heeschen, C Aicher, A Sasaki, K Bruhl, T Farhadi, MR Vajkoczy, P Hofmann, WK Peters, C Pennacchio, LA Abolmaali, ND Chavakis, E Reinheckel, T Zeiher, AM Dimmeler, S AF Urbich, C Heeschen, C Aicher, A Sasaki, K Bruhl, T Farhadi, MR Vajkoczy, P Hofmann, WK Peters, C Pennacchio, LA Abolmaali, ND Chavakis, E Reinheckel, T Zeiher, AM Dimmeler, S TI Cathepsin L is required for endothelial progenitor cell-induced neovascularization SO NATURE MEDICINE LA English DT Article ID CYSTEINE PROTEASES; EXTRACELLULAR-MATRIX; MICE DEFICIENT; STEM-CELLS; IN-VITRO; ANGIOGENESIS; INHIBITORS; GROWTH; VIVO; TRANSPLANTATION AB Infusion of endothelial progenitor cells (EPC), but not of mature endothelial cells, promotes neovascularization after ischemia. We performed gene expression profiling of EPC and endothelial cells to identify genes that might be important for the neovascularization capacity of EPC. Notably, the protease cathepsin L (CathL) was highly expressed in EPC as opposed to endothelial cells and was essential for matrix degradation and invasion by EPC in vitro. CathL-deficient mice showed impaired functional recovery following hind limb ischemia, supporting the concept of a crucial role for CathL in postnatal neovascularization. Infused CathL-deficient progenitor cells neither homed to sites of ischemia nor augmented neovascularization. Forced expression of CathL in mature endothelial cells considerably enhanced their invasive activity and sufficed to confer their capacity for neovascularization in vivo. We concluded that CathL has a critical role in the integration of circulating EPC into ischemic tissue and is required for EPC-mediated neovascularization. C1 Univ Frankfurt, Dept Internal Med 3, D-60590 Frankfurt, Germany. Univ Heidelberg, Dept Neurosurg, Fac Med, D-68167 Mannheim, Germany. Univ Frankfurt, Dept Hematol & Oncol, D-60590 Frankfurt, Germany. Univ Freiburg, Dept Mol Med & Cell Res, D-79104 Freiburg, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Genome Sci, Berkeley, CA 94720 USA. Univ Frankfurt, Inst Diagnost & Intervent Radiol, D-60590 Frankfurt, Germany. RP Dimmeler, S (reprint author), Univ Frankfurt, Dept Internal Med 3, Theodor Stern Kai 7, D-60590 Frankfurt, Germany. EM dimmeler@em.uni-frankfurt.de RI Abolmaali, Nasreddin/A-1061-2012 FU NHLBI NIH HHS [HL071954A]; NIDCR NIH HHS [DE-AC03-76SF00098] NR 41 TC 194 Z9 209 U1 2 U2 13 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1078-8956 J9 NAT MED JI Nat. Med. PD FEB PY 2005 VL 11 IS 2 BP 206 EP 213 DI 10.1038/nm1182 PG 8 WC Biochemistry & Molecular Biology; Cell Biology; Medicine, Research & Experimental SC Biochemistry & Molecular Biology; Cell Biology; Research & Experimental Medicine GA 894MZ UT WOS:000226797300029 PM 15665831 ER PT J AU Edwards, MD Li, YZ Kim, S Miller, S Bartlett, W Black, S Dennison, S Iscla, I Blount, P Bowie, JU Booth, IR AF Edwards, MD Li, YZ Kim, S Miller, S Bartlett, W Black, S Dennison, S Iscla, I Blount, P Bowie, JU Booth, IR TI Pivotal role of the glycine-rich TM3 helix in gating the MscS mechanosensitive channel SO NATURE STRUCTURAL & MOLECULAR BIOLOGY LA English DT Article ID BACTERIAL ION CHANNELS; ESCHERICHIA-COLI MSCS; TRANSMEMBRANE HELIX; PROTEIN; MECHANISM; MEMBRANE; CELLS; IDENTIFICATION; DYNAMICS; MOTIFS AB The crystal structure of an open form of the Escherichia coli MscS mechanosensitive channel was recently solved. However, the conformation of the closed state and the gating transition remain uncharacterized. The pore-lining transmembrane helix contains a conserved glycine- and alanine-rich motif that forms a helix-helix interface. We show that introducing `knobs' on the smooth glycine face by replacing glycine with alanine, and substituting conserved alanines with larger residues, increases the pressure required for gating. Creation of a glycine- glycine interface lowers activation pressure. The importance of residues Gly104, Ala106 and Gly108, which flank the hydrophobic seal, is demonstrated. A new structural model is proposed for the closed-to-open transition that involves rotation and tilt of the pore-lining helices. Introduction of glycine at Ala106 validated this model by acting as a powerful suppressor of defects seen with mutations at Gly104 and Gly108. C1 Univ Aberdeen, Inst Med Sci, Sch Med Sci, Aberdeen AB25 2ZD, Scotland. Univ Texas, SW Med Ctr, Dept Physiol, Dallas, TX 75390 USA. Univ Calif Los Angeles, DOE Ctr Gen & Prote, Los Angeles, CA 90095 USA. RP Booth, IR (reprint author), Univ Aberdeen, Inst Med Sci, Sch Med Sci, Aberdeen AB25 2ZD, Scotland. EM gen118@abdn.ac.uk RI Miller, Samantha/A-4799-2010; Iscla, Irene/B-8594-2013 OI Iscla, Irene/0000-0001-8936-430X FU NIDDK NIH HHS [DK60818]; NIGMS NIH HHS [R01 GM063919, GM61028, R01 GM061028]; Wellcome Trust [040174] NR 46 TC 72 Z9 79 U1 0 U2 2 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1545-9985 J9 NAT STRUCT MOL BIOL JI Nat. Struct. Mol. Biol. PD FEB PY 2005 VL 12 IS 2 BP 113 EP 119 DI 10.1038/nsmb895 PG 7 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 893VW UT WOS:000226749600007 PM 15665866 ER PT J AU Goedken, ER Kazmirski, SL Bowman, GD O'Donnell, M Kuriyan, J AF Goedken, ER Kazmirski, SL Bowman, GD O'Donnell, M Kuriyan, J TI Mapping the interaction of DNA with the Escherichia coli DNA polymerase clamp loader complex SO NATURE STRUCTURAL & MOLECULAR BIOLOGY LA English DT Article ID REPLICATION IN-VITRO; BETA-SLIDING CLAMP; III HOLOENZYME; GAMMA-COMPLEX; CRYSTAL-STRUCTURE; DELTA-SUBUNIT; STRUCTURAL-ANALYSIS; ATP HYDROLYSIS; MECHANISM; MACHINE AB Sliding clamps are loaded onto DNA by ATP-dependent clamp loader complexes. A recent crystal structure of a clamp loader-clamp complex suggested an unexpected mechanism for DNA recognition, in which the ATPase subunits of the loader spiral around primed DNA. We report the results of fluorescence-based assays that probe the mechanism of the Escherichia coli clamp loader and show that conserved residues clustered within the inner surface of the modeled clamp loader spiral are critical for DNA recognition, DNA-dependent ATPase activity and clamp release. Duplex DNA with a 5'-overhang single-stranded region (corresponding to correctly primed DNA) stimulates clamp release, as does blunt-ended duplex DNA, whereas duplex DNA with a 3 overhang and single-stranded DNA are ineffective. These results provide evidence for the recognition of DNA within an inner chamber formed by the spiral organization of the ATPase domains of the clamp loader. C1 Univ Calif Berkeley, Howard Hughes Med Inst, Dept Mol & Cell Biol, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Rockefeller Univ, Howard Hughes Med Inst, New York, NY 10021 USA. RP Kuriyan, J (reprint author), Univ Calif Berkeley, Howard Hughes Med Inst, Dept Mol & Cell Biol, Dept Chem, Berkeley, CA 94720 USA. EM kuriyan@berkeley.edu FU NIGMS NIH HHS [GM38839, GM45547, F32 GM066586] NR 42 TC 28 Z9 28 U1 1 U2 1 PU NATURE PUBLISHING GROUP PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1545-9985 J9 NAT STRUCT MOL BIOL JI Nat. Struct. Mol. Biol. PD FEB PY 2005 VL 12 IS 2 BP 183 EP 190 DI 10.1038/nsmb889 PG 8 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 893VW UT WOS:000226749600017 PM 15665871 ER PT J AU Cada, G Smith, J Busey, J AF Cada, G Smith, J Busey, J TI Use of pressure-sensitive film to quantify sources of injury to fish SO NORTH AMERICAN JOURNAL OF FISHERIES MANAGEMENT LA English DT Article ID TEXTURAL PROPERTIES; FILLETS AB We examined the use of pressure-sensitive film (PSF) to estimate pressures experienced by fish exposed to potentially damaging mechanical and fluid structures during downstream passage at hydroelectric dams. The films responded well to a wide range of applied pressures (0.5-50 MPa), providing reliable estimates of pressures even when contained within waterproof plastic packaging, stacked under other films, and exposed at low water temperatures or low and high relative humidities. Waterproof packages of PSF were field-tested by wrapping them around polycarbonate plastic cylinders and passing them down the spillways of hydroelectric dams. Most of the spillway-passed PSF samples had marks indicating impacts. Many of the marks revealed high values of pressure (e.g., > 40 MPa) that are likely to injure fish. C1 Oak Ridge Natl Lab, Environm Sci Div, Oak Ridge, TN 37831 USA. RP Cada, G (reprint author), Oak Ridge Natl Lab, Environm Sci Div, POB 2008, Oak Ridge, TN 37831 USA. EM cadagf@ornl.gov NR 22 TC 1 Z9 2 U1 1 U2 4 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 0275-5947 J9 N AM J FISH MANAGE JI North Am. J. Fish Manage. PD FEB PY 2005 VL 25 IS 1 BP 57 EP 66 DI 10.1577/M03-190.1 PG 10 WC Fisheries SC Fisheries GA 911UN UT WOS:000228031200007 ER PT J AU Johnson, GE Anglea, SM Adams, NS Wik, TO AF Johnson, GE Anglea, SM Adams, NS Wik, TO TI Evaluation of a prototype surface flow bypass for juvenile salmon and steelhead at the powerhouse of Lower Granite Dam, Snake River, Washington, 1996-2000 SO NORTH AMERICAN JOURNAL OF FISHERIES MANAGEMENT LA English DT Article ID AMERICAN SHAD; WELLS DAM; ONCORHYNCHUS; PASSAGE; SMOLTS AB A surface flow bypass takes advantage of the natural surface orientation of most juvenile salmon Oncorhynchus spp. and steelhead O. mykiss by providing a route in the upper water column that downstream migrant fishes can use to pass a hydroelectric dam safely. A prototype structure, called the surface bypass and collector (SBC), was retrofitted on the powerhouse of Lower Granite Dam and was evaluated annually with biotelemetry and hydroacoustic techniques during the 5-year life span of the structure (1996-2000) to determine the entrance configuration that maximized passage efficiency and minimized forebay residence time. The best tested entrance configuration had maximum inflow (99 m(3)/s) concentrated in a single surface entrance (5 m wide, 8.5 m deep). We identified five important considerations for future surface flow bypass development in the lower Snake River and elsewhere: (1) an extensive flow net should be formed in the forebay by use of relatively high surface flow bypass discharge (> 7% of total project discharge); (2) a gradual increase in water velocity with increasing proximity to the surface flow bypass (ideally, acceleration < 1 m/s per meter) should be created; (3) water velocities at an entrance should be high enough (> 3 m/s) to entrain the subject juvenile fishes; (4) the shape and orientation of the surface entrance(s) should be adapted to fit site-specific features; and (5) construction of a forebay wall to increase fish availability to the surface flow bypass should be considered. The efficiency of the SBC was not high enough (maximum of 62% relative to passage at turbine units 4-5) for the SBC to operate as a stand-alone bypass. Anywhere that surface-oriented anadromous fish must negotiate hydroelectric dams, surface flow bypass systems can provide cost-effective use of typically limited water supplies to increase the nonturbine passage, and presumably survival, of downstream migrants. C1 Battelles Pacific NW Div, Portland, OR 97204 USA. Battelles Pacific NW Div, Richland, WA 99352 USA. Columbia River Res Lab, US Geol Survey, Biol Resources Div, Cook, WA 98605 USA. US Army Corps Engineers, Walla Walla, WA 99362 USA. RP Johnson, GE (reprint author), Battelles Pacific NW Div, 620 SW 5th Ave,Suite 810, Portland, OR 97204 USA. EM gary.johnson@pnl.gov NR 44 TC 23 Z9 23 U1 4 U2 13 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 0275-5947 J9 N AM J FISH MANAGE JI North Am. J. Fish Manage. PD FEB PY 2005 VL 25 IS 1 BP 138 EP 151 DI 10.1577/M04.024.1 PG 14 WC Fisheries SC Fisheries GA 911UN UT WOS:000228031200016 ER PT J AU Tuli, JK AF Tuli, JK TI Nuclear Data Sheets - Volume 104, Number 2 - February 2005 SO NUCLEAR DATA SHEETS LA English DT Article ID ODD-ODD NUCLEI; FLUORESCENCE YIELDS; A NUCLEI; TRANSITIONS; STATES C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tuli, JK (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0090-3752 J9 NUCL DATA SHEETS JI Nucl. Data Sheets PD FEB PY 2005 VL 104 IS 2 BP I EP XI PG 11 WC Physics, Nuclear SC Physics GA 896RD UT WOS:000226950300001 ER PT J AU Browne, E AF Browne, E TI Nuclear Data Sheets for A=212 SO NUCLEAR DATA SHEETS LA English DT Review ID HIGH-SPIN ISOMERS; ALPHA-DECAY WIDTHS; INDEPENDENT PARTICLE MODEL; RAY EMISSION PROBABILITIES; ABSOLUTE MAGNETIC-MOMENTS; THORIUM ACTIVE DEPOSIT; ENERGY GAMMA-RADIATION; ATOMIC MASS EVALUATION; TRANS-BISMUTH NUCLEI; CORE-EXCITED STATES AB The evaluator presents in this publication spectroscopic data and level schemes from radioactive decay and nuclear reactions for all nuclei with mass number A=212. Highlights from this evaluation include the recent studies of the 208Pb(Li-7,3ngamma) reaction (1999Ba30,1998By01), which have extended the previously known level scheme of At-212 up to Jpi=25- and provided additional shell-model configuration assignments. Also, it includes the new a-particle and gamma-ray data from the a decays of Fr-216 (ground state and isomer) (1996Li37), Ac-216 (ground state and isomer)(2000He17), and Pa-216 (2000111,17). Finally, this evaluation presents strong evidence supporting the discovery of a new isotope of protactinium, Pa-212 (1997Mi03). The use of the radius parameter (r(0)) from 1998Ak04 in the calculation of a hindrance factors for odd-odd nuclei presented here provides uniformity for the application of these quantities to nuclear systematics. The Limitation of Relative Statistical Weight (LWM) method (1985ZIZY) has been very useful for the analyses of discrepant data throughout this evaluation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Browne, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 253 TC 22 Z9 23 U1 0 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0090-3752 EI 1095-9904 J9 NUCL DATA SHEETS JI Nucl. Data Sheets PD FEB PY 2005 VL 104 IS 2 BP 427 EP + DI 10.1016/j.nds.2005.01.002 PG 68 WC Physics, Nuclear SC Physics GA 896RD UT WOS:000226950300003 ER PT J AU Logan, BG Bieniosek, FM Celata, CM Henestroza, E Kwan, JW Lee, EP Leitner, M Roy, PK Seidl, PA Eylon, S Vay, JL Waldron, WL Yu, SS Barnard, JJ Callahan, DA Cohen, RH Friedman, A Grote, DP Covo, MK Meier, WR Molvik, AW Lund, SM Davidson, RC Efthimion, PC Gilson, EP Grisham, LR Kaganovich, ID Qin, H Startsev, EA Rose, DV Welch, DR Olson, CL Kishek, RA O'Shea, P Haber, I Prost, LR AF Logan, BG Bieniosek, FM Celata, CM Henestroza, E Kwan, JW Lee, EP Leitner, M Roy, PK Seidl, PA Eylon, S Vay, JL Waldron, WL Yu, SS Barnard, JJ Callahan, DA Cohen, RH Friedman, A Grote, DP Covo, MK Meier, WR Molvik, AW Lund, SM Davidson, RC Efthimion, PC Gilson, EP Grisham, LR Kaganovich, ID Qin, H Startsev, EA Rose, DV Welch, DR Olson, CL Kishek, RA O'Shea, P Haber, I Prost, LR TI Overview of US heavy ion fusion research SO NUCLEAR FUSION LA English DT Article ID TRANSPORT; CHAMBER AB Significant experimental and theoretical progress has been made in the US heavy ion fusion programme on high-current sources, injectors, transport, final focusing, chambers and targets for high-energy density physics and inertial fusion energy (IFE) driven by induction linac accelerators. One focus of the present research is the beam physics associated with quadrupole focusing of intense, space-charge-dominated heavy ion beams, including gas and electron cloud effects at high currents, and the study of long-distance-propagation effects such as emittance growth due to field errors in scaled experiments. A second area of emphasis in the present research is the introduction of background plasma to neutralize the space-charge of intense heavy ion beams and assist in focusing the beams to a small spot size. In the near future, research will continue in the above areas, and a new area of emphasis will be to explore the physics of neutralized beam compression and focusing to high intensities required to heat targets to high-energy density conditions as well as for IFE. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Livermore, CA USA. Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. ATK Mission Res, Albuquerque, NM USA. Sandia Natl Labs, Livermore, CA 94550 USA. Univ Maryland, College Pk, MD 20742 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Logan, BG (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 24 TC 27 Z9 27 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0029-5515 EI 1741-4326 J9 NUCL FUSION JI Nucl. Fusion PD FEB PY 2005 VL 45 IS 2 BP 131 EP 137 DI 10.1088/0029-5515/45/2/006 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 908VO UT WOS:000227818500008 ER PT J AU Weisen, H Zabolotsky, A Angioni, C Furno, I Garbet, X Giroud, C Leggate, H Mantica, P Mazon, A Weiland, J Zabeo, L Zastrow, KD AF Weisen, H Zabolotsky, A Angioni, C Furno, I Garbet, X Giroud, C Leggate, H Mantica, P Mazon, A Weiland, J Zabeo, L Zastrow, KD TI Collisionality and shear dependences of density peaking in JET and extrapolation to ITER SO NUCLEAR FUSION LA English DT Letter ID L-MODE PLASMAS; PARTICLE PINCH; ASDEX UPGRADE; INVERSION; TOKAMAK; PROFILE; SHAPE; TCV AB Results from an extensive database analysis of JET density profiles in stationary conditions show that the density peaking factor n(e0)/< n(e)> in JET H modes increases from near 1.2 at high collisionality to around 1.5 as the plasma collisionality decreases towards the values expected for ITER. This result confirms an earlier observation on AUG. The density peaking behaviour of L modes is remarkably different from that of H modes, scaling with overall plasma shear as (n(e0)/< n(e)> similar to 1.5l(i)), independently of collisionality. H-mode density profiles show no shear dependence, except at the lowest collisionalities. No evidence for L-Te, L-Ti, rho* or beta dependences has been obtained. Carbon impurity density profiles from charge exchange spectroscopy are always less peaked than electron density profiles and usually flat in H modes. The peaking of the electron density profiles, together with the flatness of the impurity density profiles, are favourable for fusion performance if they can be extrapolated to ignited conditions. C1 Assoc Euratom Confederat Suisse, Ctr Rech Phys Plasmas, EPFL, CH-1015 Lausanne, Switzerland. EURATOM, IPP, Max Planck Inst Plasmaphys, D-85748 Garching, Germany. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. CEA, DRFC, DSM, EURATOM Assoc, Cadarache, France. United Kingdom Atom Energy Author, UKAEA Euratom Fus Assoc, Abingdon, Oxon, England. CNR, ENEA, EURATOM Assoc, Ist Fis Plasma, I-20133 Milan, Italy. Euratom VR Assoc, Gothenburg, Sweden. RP Weisen, H (reprint author), Assoc Euratom Confederat Suisse, Ctr Rech Phys Plasmas, EPFL, CH-1015 Lausanne, Switzerland. RI Mantica, Paola/K-3033-2012 NR 16 TC 58 Z9 58 U1 1 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD FEB PY 2005 VL 45 IS 2 BP L1 EP L4 DI 10.1088/0029-5515/45/2/L01 PG 4 WC Physics, Fluids & Plasmas SC Physics GA 908VO UT WOS:000227818500001 ER PT J AU Norem, J Insepov, Z Konkashbaev, I AF Norem, J Insepov, Z Konkashbaev, I TI Triggers for RF breakdown SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE RF breakdown; dark currents; field emission ID SCANNING TUNNELING POTENTIOMETRY; ELECTRICAL BREAKDOWN; TRANSPORT; VACUUM AB We outline a model of breakdown in RF cavities. In this model, the breakdown trigger is the injection of ions, atoms and clusters into cavities by either of two mechanisms. One mechanism is some combination of fracture and field evaporation of ions from solid surfaces caused by locally high electric fields. The second mechanism, driven by high local current densities, is localized Ohmic heating at grain boundaries and defects. Field evaporation and fracturing are similar processes, both driven by the high tensile stresses in the electric field that occur at local electric fields of similar to10(10)V/m, which have been measured in a number of experimental environments. We also outline how ions can be injected into cavities in the presence of large RF electric fields. The model can explain most of the behavior seen in a variety of cavities at different frequencies without assuming that melting or gas emission occurs at breakdown sites. This model may also be relevant to DC vacuum breakdown. (C) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA. EM norem@anl.gov RI Insepov, Zinetula/L-2095-2013 OI Insepov, Zinetula/0000-0002-8079-6293 NR 27 TC 21 Z9 21 U1 1 U2 5 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 FEB 1 PY 2005 VL 537 IS 3 BP 510 EP 520 DI 10.1016/j.nima.2004.07.289 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 894SQ UT WOS:000226812300003 ER PT J AU Egorov, OB Addleman, RS O'Hara, MJ Marks, T Grate, JW AF Egorov, OB Addleman, RS O'Hara, MJ Marks, T Grate, JW TI Direct measurement of alpha emitters in liquids using passivated ion implanted planar silicon (PIPS) diode detectors SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE pips diode detectors; total alpha analysis; liquid samples; process monitoring ID EXTRACTION CHROMATOGRAPHIC-SEPARATIONS; SEQUENTIAL INJECTION TECHNIQUES; GROSS-ALPHA; ICP-MS; ACTINIDES; ELEMENTS; URANIUM AB The present study evaluated the feasibility of direct measurement of alpha emitting radionuclides in liquids using passivated ion implanted planar silicon (PIPS) diode detectors. The performance characteristics and durability of PIPS diode detectors enabled direct detection of alpha particles from liquid samples by placing the diode detector in close proximity to the liquid sample. Factors affecting the sensitivity and accuracy of direct detection of alpha-emitters in solution and interferences of beta/gamma emitters have been examined. Direct assay of liquid samples using PIPS diode detectors can enable rapid and straightforward detection methodologies suitable for process control applications. (C) 2004 Elsevier B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Egorov, OB (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd,POB 999, Richland, WA 99352 USA. EM oleg.egorov@pnl.gov RI O'Hara, Matthew/I-4967-2013; OI O'Hara, Matthew/0000-0003-3982-5897 NR 26 TC 12 Z9 12 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 1 PY 2005 VL 537 IS 3 BP 600 EP 609 DI 10.1016/j.nima.2004.07.290 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 894SQ UT WOS:000226812300010 ER PT J AU Cusanno, F Garibaldi, F Cisbani, E Colilli, S De Cataldo, G De Leo, R Giuliani, F Gricia, M Lagamba, L Lucentini, M Reitz, B Santavenere, F Urciuoli, GM AF Cusanno, F Garibaldi, F Cisbani, E Colilli, S De Cataldo, G De Leo, R Giuliani, F Gricia, M Lagamba, L Lucentini, M Reitz, B Santavenere, F Urciuoli, GM TI Erratum to: "A RICH detector for strangeness physics in Hall A at Jefferson lab" (vol 525, pg 163, 2004) SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Correction C1 Lab Phys, I-00161 Rome, Italy. INFN, Sez Bari, Bari, Italy. Jefferson Lab, Newport News, VA USA. INFN, Sez Roma 1, Rome, Italy. RP Cusanno, F (reprint author), Lab Phys, Viale Regina Elena 299, I-00161 Rome, Italy. EM francesco.cusanno@iss.infn.it RI Cisbani, Evaristo/C-9249-2011 OI Cisbani, Evaristo/0000-0002-6774-8473 NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD FEB 1 PY 2005 VL 537 IS 3 BP 703 EP 703 DI 10.1016/j.nima.2004.10.020 PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 894SQ UT WOS:000226812300021 ER PT J AU Selvi, S Tek, Z Oztarhan, A Akbas, N Brown, IG AF Selvi, S Tek, Z Oztarhan, A Akbas, N Brown, IG TI High fluence effects on ion implantation stopping and range SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE ion implantation; implantation codes; high dose implantation; nuclear and electronic stopping powers ID HEAVY-IONS; SOLIDS; POWER; SIMULATION; EQUATION; DEPTH AB We have developed a code STOPPO which can be used to modify the more-widely used ion implantation codes to more accurately predict the mean nuclear and electronic stopping power, preferential sputtering and range of heavy ions in monatomic target materials. In our simulations an effective atomic number and effective atomic mass are introduced into conveniently available analytical stopping cross-sections and a better fitting function for preferential sputtering yield is carefully evaluated for each ion implantation. The accuracy of the code confirmed experimentally by comparison with measured Rutherford backscattering spectrometry (RBS) concentration profiles for 130 keV Zr ions implanted into Be to fluences of 1 x 10(17), 2 x 10(17) and 4 x 10(17) ions/cm(2). We find a steady increase in the mean nuclear and electronic stopping powers of the target; the increase in nuclear stopping power is much greater than the increase in electronic stopping power. (C) 2004 Elsevier B.V. All rights reserved. C1 Ege Univ, Fac Sci, Dept Phys, TR-35100 Bornova, Turkey. Celal Bayar Univ, Fac Sci, Dept Phys, TR-45040 Manisa, Turkey. Ege Univ, Fac Engn, Dept Bioengn, TR-35100 Bornova, Turkey. Celal Bayar Univ, Fac Engn, Dept Met, TR-45040 Manisa, Turkey. Univ Calif Berkeley, Lawrence Berkeley Lab, AFRD, Berkeley, CA 94720 USA. RP Selvi, S (reprint author), Ege Univ, Fac Sci, Dept Phys, TR-35100 Bornova, Turkey. EM selvi@sci.ege.edu.tr; igbrown@comcast.net NR 26 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD FEB PY 2005 VL 229 IS 1 BP 60 EP 64 DI 10.1016/j.nimb.2004.11.015 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 904UF UT WOS:000227522500007 ER PT J AU Gerasimov, MR Ferrieri, RA Pareto, D Logan, J Alexoff, D Ding, YS AF Gerasimov, MR Ferrieri, RA Pareto, D Logan, J Alexoff, D Ding, YS TI Synthesis and evaluation of inhaled [C-11]butane and intravenously injected [C-11]acetone as potential radiotracers for studying inhalant abuse SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article DE PET; inhalants; substance abuse; pharmacokinetics ID TOLUENE-BASED ADHESIVES; BRAIN UPTAKE; ACETONE METABOLISM; VOLATILE SUBSTANCE; NONHUMAN-PRIMATES; ORGANIC-SOLVENTS; BUTANE GAS; METHYLPHENIDATE; DOPAMINE; MICE AB The phenomenon of inhalant abuse is a growing problem in the US and many countries around the world. Yet, relatively little is known about the pharmacokinetic properties of inhalants that underlie their abuse potential. While the synthesis of 11 C-labeled toluene, acetone and butane has been proposed in the literature, none of these compounds has been developed as radiotracers for PET studies. In the present report we extend our previous studies with [C-11]toluene to include [C-11]acetone and [11C]butane with the goal of comparing the pharmacokinetic profiles of these three volatile abused substances. Both [C-11]toluene and [C-11]acetone were administered intravenously and [C-11]butane was administered via inhalation to anesthesized baboons. Rapid and efficient uptake of radiolabeled toluene and acetone into the brain was followed by fast clearance in the case of toluene and slower kinetics in the case of acetone. [C-11]Butane was detected in the blood and brain following inhalation, but the levels of radioactivity in both tissues dropped to half of the maximal values over the period of less than a minute. To our knowledge, this is the first reported study of the in vivo brain pharmacokinetics of labeled acetone and butane in nonhuman primates. These data provide insight into the pharmacokinetic features possibly associated with the abuse liability of toluene, acetone and butane. (c) 2005 Elsevier Inc. All rights reserved. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Berkeley Natl Lab, Dept Nucl Med & Funct Imaging, Berkeley, CA 94720 USA. RP Logan, J (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM logan@bnl.gov OI Logan, Jean/0000-0002-6993-9994 FU NIDA NIH HHS [NIH1R01 DA15082-01] NR 61 TC 9 Z9 10 U1 1 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0969-8051 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD FEB PY 2005 VL 32 IS 2 BP 201 EP 208 DI 10.1016/j.nucmedbio.2004.11.002 PG 8 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA 907BF UT WOS:000227689100012 PM 15721766 ER PT J AU Harris, DA AF Harris, DA TI Oscillation measurements with calorimeters: Why does NuINT matter? SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 3rd International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region CY MAR 17-21, 2004 CL Assergi, ITALY AB This document briefly describes the primary goals of the next generation of oscillation experiments to use calorimetric detectors, and why a precise understanding of neutrino interactions is important for them to correctly interpret their data. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Harris, DA (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 EI 1873-3832 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD FEB PY 2005 VL 139 BP 33 EP 38 DI 10.1016/j.nuclphysbps.2004.11.227 PG 6 WC Physics, Particles & Fields SC Physics GA 895KH UT WOS:000226859700007 ER PT J AU Budd, H Bodek, A Arrington, J AF Budd, H Bodek, A Arrington, J TI Vector and axial form factors applied to neutrino quasielastic scattering SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 3rd International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region CY MAR 17-21, 2004 CL Assergi, ITALY ID DEUTERIUM; NUCLEON AB We calculate the quasielastic cross sections for neutrino scattering on nucleons using up to date fits to the nucleon elastic electromagnetic form factors G(E)(p), G(E)(n), G(M)(p), G(M)(n), and weak form factors. We show the extraction of F-A(q(2)) for neutrino experiments. We show how well MINERnuA, a new approved experiment at FNAL, can measure F-A(q(2)). We show the that F-A(q(2)) has a different contribution to the anti-neutrino cross section, and how the anti-neutrino data can be used to check F-A(q(2)) extracted from neutrino scattering. (Presented by Howard Budd at NuInt04, Mar. 2004, Laboratori Nazionali del Gran Sasso - INFN - Assergi, Italy [1]). C1 Univ Rochester, Dept Phys & Astron, Rochester, NY 14618 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Budd, H (reprint author), Univ Rochester, Dept Phys & Astron, Rochester, NY 14618 USA. RI Arrington, John/D-1116-2012; OI Arrington, John/0000-0002-0702-1328; Bodek, Arie/0000-0003-0409-0341 NR 21 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD FEB PY 2005 VL 139 BP 90 EP 95 DI 10.1016/j.nuclphysbps.2004.11.181 PG 6 WC Physics, Particles & Fields SC Physics GA 895KH UT WOS:000226859700016 ER PT J AU Kretzer, S Reno, MH AF Kretzer, S Reno, MH TI sigma(DIS)(vN), NLO perturbative QCCD and O(1GeV) mass corrections SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 3rd International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region CY MAR 17-21, 2004 CL Assergi, ITALY ID NUCLEON-SCATTERING; CHARGED CURRENT; PION-PRODUCTION; CROSS-SECTION; HEAVY QUARKS; HIGHER TWIST; RESONANCES; BEHAVIOR; DUALITY AB The deep-inelastic neutrino-nucleon cross section is one of the components of few GeV neutrino interactions. We present here our results for neutrino-isoscalar nucleon charged current scattering including perturbative next-to-leading order QCD corrections, target mass corrections, charm mass and lepton mass corrections. C1 Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA. Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. RP Kretzer, S (reprint author), Brookhaven Natl Lab, Phys Dept, Bldg 510a, Upton, NY 11973 USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD FEB PY 2005 VL 139 BP 134 EP 139 DI 10.1016/j.nuclphysbps.2004.11.237 PG 6 WC Physics, Particles & Fields SC Physics GA 895KH UT WOS:000226859700023 ER PT J AU Brice, S Bugel, L Conrad, JM Doskow, J Dukes, C Finley, D Fleming, BT Garvey, GT Green, C Horowitz, C Katori, T Link, JM Louis, WC Lu, L McGregor, G Metcalf, W Meyer, HO Nelson, K Norman, A Ockerse, P Papavassiliou, V Pate, SF Peng, JC Ray, H Shaevitz, M Stefanski, R Sung, M Tayloe, R Van de Water, R Visser, G Wang, L Wascko, MO Zeller, GP AF Brice, S Bugel, L Conrad, JM Doskow, J Dukes, C Finley, D Fleming, BT Garvey, GT Green, C Horowitz, C Katori, T Link, JM Louis, WC Lu, L McGregor, G Metcalf, W Meyer, HO Nelson, K Norman, A Ockerse, P Papavassiliou, V Pate, SF Peng, JC Ray, H Shaevitz, M Stefanski, R Sung, M Tayloe, R Van de Water, R Visser, G Wang, L Wascko, MO Zeller, GP TI The FlNeSSE detector SO NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS LA English DT Article; Proceedings Paper CT 3rd International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region CY MAR 17-21, 2004 CL Assergi, ITALY ID PROTON AB Experimental results from the last five years showing that neutrinos oscillate and have mass have revolutionized how we think about neutrinos. This includes not only what their place is in the Standard Model, but also how we can use them to understand the universe. Can neutrinos also help us probe the smallest scales of matter, such as mapping out the spin structure of the nucleon? New high intensity beams and novel detection techniques have rekindled interest in neutrino scattering physics, allowing us to answer these questions. Described here is a detection technique for the FINeSSE experiment, designed to well measure low Q(2), v-p elastic scattering events, necessary to determine the spin carried by the strange quarks in the nucleon. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Columbia Univ, Nevis Labs, Irvington, NY 10533 USA. Indiana Univ, Bloomington, IN 47408 USA. Univ Virginia, Charlottesville, VA 22901 USA. Yale Univ, New Haven, CT 06520 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Louisiana State Univ, Baton Rouge, LA 70803 USA. New Mexico State Univ, Las Cruces, NM 88003 USA. Univ Illinois, Urbana, IL 61801 USA. RP Brice, S (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5632 J9 NUCL PHYS B-PROC SUP JI Nucl. Phys. B-Proc. Suppl. PD FEB PY 2005 VL 139 BP 317 EP 322 DI 10.1016/j.nuclphysbps.2004.11.232 PG 6 WC Physics, Particles & Fields SC Physics GA 895KH UT WOS:000226859700049 ER PT J AU Phuoc, TX AF Phuoc, TX TI An experimental and numerical study of laser-induced spark in air SO OPTICS AND LASERS IN ENGINEERING LA English DT Article ID INDUCED BREAKDOWN; IGNITION ENERGY; DIFFUSION FLAME; GASES; MODEL; WAVES; FUEL AB The present work studied the expansion of a laser-induced spark in air. The experiments were carried out using the beam deflection technique. Numerical analysis used a simple one-dimensional spherical model and the governing equations were integrated numerically using the MacCormack predictor-corrector scheme. The present results indicated that the shock radius R is proportional to shock arrival time t(0.4) and the shock pressure is proportional to R-3 as functionally described by the blast wave theory. For the range of the spark energies from 15 to 50 mJ, the shock front reached a distance of about 2 mm within a few microseconds or less. During this period the shock-wave energy loss was from about 51% to 70%, the radiation energy losses accounted for were from 22% to 34%, and the energy of the remaining hot gas, was about 7-8% of the absorbed energy. Published by Elsevier Ltd. C1 Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. RP Phuoc, TX (reprint author), Natl Energy Technol Lab, POB 10940,MS 84-340, Pittsburgh, PA 15236 USA. EM phuoc.tran@netl.doe.gov NR 28 TC 26 Z9 32 U1 2 U2 9 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0143-8166 J9 OPT LASER ENG JI Opt. Lasers Eng. PD FEB PY 2005 VL 43 IS 2 BP 113 EP 129 DI 10.1016/j.optlaseng.2004.07.003 PG 17 WC Optics SC Optics GA 879YZ UT WOS:000225756700001 ER PT J AU DeMange, P Carr, CW Negres, RA Radousky, HB Demos, SG AF DeMange, P Carr, CW Negres, RA Radousky, HB Demos, SG TI Multiwavelength investigation of laser-damage performance in potassium dihydrogen phosphate after laser annealing SO OPTICS LETTERS LA English DT Article ID RAPID-GROWTH; CRYSTALS; KH2PO4; IRRADIATION; DEFECTS AB The laser-induced damage performance of potassium dihydrogen phosphate and deuterated potassium dihydrogen phosphate nonlinear optical crystals after pre-exposure to lower-energy laser pulses (laser annealing, also known as laser conditioning) is investigated as a function of wavelength for both the damaging and conditioning pulses. We obtain a quantitative evaluation of the bulk damage performance of these materials by measuring the density of damage events as a function of laser parameters. This new, method allows for a detailed assessment of the improvement of material performance from laser conditioning and reveals the key parameters for optimizing performance depending on the operational wavelength. (C) 2005 Optical Society or America. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP DeMange, P (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94551 USA. EM demange1@llnl.gov RI Carr, Chris/F-7163-2013 NR 15 TC 25 Z9 27 U1 3 U2 7 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 FEB 1 PY 2005 VL 30 IS 3 BP 221 EP 223 DI 10.1364/OL.30.000221 PG 3 WC Optics SC Optics GA 892VO UT WOS:000226678300001 PM 15751865 ER PT J AU Pint, BA DiStefano, JR AF Pint, BA DiStefano, JR TI The role of oxygen uptake and scale formation on the embrittlement of vanadium alloys SO OXIDATION OF METALS LA English DT Article DE refractory metal; vanadium alloy; environmental effects; mechanical properties; oxide dissolution ID CR-TI ALLOYS; REACTOR STRUCTURAL-MATERIALS; MECHANICAL-PROPERTIES; CRITICAL-ISSUES; LOW-PRESSURE; BASE ALLOYS; OXIDATION; FUSION; COMPATIBILITY; AIR AB Vanadium alloys are of interest in fusion energy systems, however, their environmental durability is a major concern. Specimens of V-4Cr-4Ti were exposed to air and oxygen (10(5) Pa), low pressure (10(-3)-10(-6) Pa) oxygen and high purity He environments (10(5)- 10(1) Pa) at 500-700degreesC in order to characterize the surface oxide, determine oxidation kinetics and quantify effects on mechanical properties at 25 and 600degreesC. At low oxygen pressures (Po-2 less than or equal to 10(-5) Pa), linear reaction kinetics were measured for exposures up to 2000 hr and the data were used to develop a mathematical expression for the oxidation rate as a function of temperature and oxygen pressure. At higher pressures, linear-parabolic reaction kinetics were associated with high oxygen uptake and the formation of an external oxide layer. Room-temperature and 600degreesC tensile ductility was reduced by these exposures, but specimens which formed an external oxide were found to retain some tensile ductility after exposure. However, similar specimens with an external oxide that were subsequently annealed for 2000 hr at 700degreesC became severely embrittled demonstrating that a surface oxide will not prevent degradation of this refractory alloy. Exposures in He were performed to determine the effect of total gas pressure on oxygen uptake. C1 Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Pint, BA (reprint author), Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. EM pintba@ornl.gov RI Pint, Bruce/A-8435-2008 OI Pint, Bruce/0000-0002-9165-3335 NR 32 TC 10 Z9 12 U1 0 U2 5 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X J9 OXID MET JI Oxid. Met. PD FEB PY 2005 VL 63 IS 1-2 BP 33 EP 55 DI 10.1007/s11085-005-1950-7 PG 23 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 896PM UT WOS:000226946000003 ER PT J AU Hou, PY Priimak, K AF Hou, PY Priimak, K TI Interfacial segregation, pore formation, and scale adhesion on NiAl alloys SO OXIDATION OF METALS LA English DT Article DE NiAl; Al2O3; oxide/metal interface; segregation; sulfur; adhesion; interface void ID OXIDATION BEHAVIOR; SULFUR SEGREGATION; OXIDE SCALE; GROWTH; ALPHA-AL2O3; SURFACE; SPECTROMETRY; MECHANISM; ADHERENCE; IMPURITY AB Ni-40 and 50at% Al alloys were oxidized at 1000degreesC for various times in oxygen. Auger electron microscopy was used to study the interface chemistry after scale spallation in ultra high vacuum. The interfacial failure stresses were determined using a tensile pull tester and related to the interface chemistry, pore area and density. Results showed that sulfur started to segregate to areas of the Al2O3/Ni40Al interface, where the scale was in contact with the alloy after a complete layer of alpha-Al2O3 developed there; the concentration then gradually increased to a steady level of similar to 2 at%. However, sulfur did not segregate to similar areas of the Al2O3/Ni50Al interface even after extended oxidation when it was amply present on interfacial void faces. This behavior demonstrated a strong dependence of interface segregation on NiAl alloy composition. Interfacial failure stress was found to decrease with increasing sulfur content between voids and with higher interface porosity. The level of porosity was strongly related to the sulfur content in the alloy. When Ni40Al was doped with excess sulfur, the segregation behavior did not change, but the interfacial pore density increased significantly. The detrimental effect of sulfur on scale adhesion is 2-fold: to weaken the interface and to enhance interfacial pore formation. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Hou, PY (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM PYHou@lbl.gov NR 38 TC 74 Z9 77 U1 4 U2 25 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X EI 1573-4889 J9 OXID MET JI Oxid. Met. PD FEB PY 2005 VL 63 IS 1-2 BP 113 EP 130 DI 10.1007/s11085-005-1954-3 PG 18 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 896PM UT WOS:000226946000007 ER PT J AU Nagaoka, S Katoh, S WoldeGabriel, G Sato, H Nakaya, H Beyene, Y Suwa, G AF Nagaoka, S Katoh, S WoldeGabriel, G Sato, H Nakaya, H Beyene, Y Suwa, G TI Litho stratigraphy and sedimentary environments of the hominid-bearing Pliocene-Pleistocene Konso formation in the southern Main Ethiopian Rift, Ethiopia SO PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY LA English DT Article DE Pliocene-Pleistocene Konso formation; lithostratigraphy; depositional history; lake environments; quaternary rifting; Main Ethiopian Rift ID AMARO HORST; VOLCANISM; KENYA AB The Pliocene-Pleistocene Konso Formation defined here is >180 m thick and is extensively exposed in the Konso area at the southernmost part of the Ganjuli graben of the Main Ethiopian Rift. The Konso area is known for its abundant vertebrate fossils, including those of Homo erectus and Australopithecus boisei. and its rich Acheulean archaeological assemblages. The fluvial, floodplain, lake margin. and lacustrine sediments of the formation were mostly deposited between 1.9 and 1.4 Ma. based on single-crystal Ar-40/Ar-39 ages of interbedded marker tuffs. The formation is subdivided into the Sorobo, Turoha, Kayle, and Karat Members, in ascending stratigraphic order. Each member contains dark brown or dark grey clay beds of lake margin and/or lacustrine origin, suggesting the recurrence of lake environments. Most of the fossils and artifacts derive from whitish grey or brown silt, sand, and gravel beds widely exposed between the finer sediments. These beds appear to have been deposited in an emerging marginal floodplain following repeated recession of the palaeo-lake. The depositional history of the Konso Formation reveals aspects of Quaternary rifting at the southern terminus of the Main Ethiopian Rift, Rifting. subsidence. and sedimentation in the Ganjuli graben occurred in the Konso area mainly between 1.9 and 1.4 Ma. while active faulting with associated volcanism during the Pleistocene was mostly confined to the middle pan of the graben between Lakes, Abaya and Chamo and to the Segen basin east of Konso. A shift of rift-related faulting and subsidence from the Konso area eastward to the Segen basin is likely to have resulted in the erosion and exposure of the fossiliferous Konso Formation. (C) 2004 Elsevier B.V. All rights reserved. C1 Hyogo Museum Nat & Human Activ, Div Earth Sci, Sanda, Hyogo 6691546, Japan. Nagasaki Univ, Dept Geog, Nagasaki 8528131, Japan. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Kagawa Univ, Dept Earth Sci, Takamatsu, Kagawa 7608522, Japan. Minist Youth Sports & Culture, CRCCH, Dept Archaeol & Anthropol, Addis Ababa, Ethiopia. Univ Tokyo, Univ Museum, Bunkyo Ku, Tokyo 1130033, Japan. RP Katoh, S (reprint author), Hyogo Museum Nat & Human Activ, Div Earth Sci, Yayoigaoka 6, Sanda, Hyogo 6691546, Japan. EM katochan@hitohaku.jp NR 29 TC 12 Z9 13 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-0182 J9 PALAEOGEOGR PALAEOCL JI Paleogeogr. Paleoclimatol. Paleoecol. PD FEB 1 PY 2005 VL 216 IS 3-4 BP 333 EP 357 DI 10.1016/j.palaeo.2004.11.008 PG 25 WC Geography, Physical; Geosciences, Multidisciplinary; Paleontology SC Physical Geography; Geology; Paleontology GA 892UJ UT WOS:000226675200010 ER PT J AU Gao, JZ Wang, C Li, LY Shen, HW AF Gao, JZ Wang, C Li, LY Shen, HW TI A parallel multiresolution volume rendering algorithm for large data visualization SO PARALLEL COMPUTING LA English DT Article; Proceedings Paper CT Symposium on Parallel Graphics and Visualization CY JUN, 2004 CL Grenoble, FRANCE DE large scale data; multiresolution; wavelet transform; space-filling curve; load balancing; volume rendering; parallel rendering AB We present a new parallel multiresolution volume rendering algorithm for visualizing large data sets. Using the wavelet transform, the raw data is first converted to a multi resolution wavelet tree. To eliminate the data dependency between processors at run-time, and achieve load-balanced rendering, we design a novel algorithm to partition the tree and distribute the data along a hierarchical space-filling curve with error-guided bucketization. Further optimization is achieved by storing reconstructed data at pre-selected tree nodes for each processor based on the available storage resources to reduce the overall wavelet reconstruction cost. At run time, the wavelet tree is first traversed according to the user-specified error tolerance. Data blocks of different resolutions that satisfy the error tolerance are then decompressed and rendered to compose the final image in parallel. Experimental results showed that our algorithm can reduce the run-time communication cost to a minimum and ensure a well-balanced workload among processors when visualizing gigabytes of data with arbitrary error tolerances. (c) 2005 Elsevier B.V.. All rights reserved. C1 Ohio State Univ, Columbus, OH 43210 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37381 USA. RP Ohio State Univ, 395 Dreese Labs,2015 Neil Ave, Columbus, OH 43210 USA. EM gao.52@osu.edu; wang.726@osu.edu; li.530@osu.edu; hwshen@cse.ohio-state.edu RI Gao, Jinzhu/B-4716-2011 NR 27 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 EI 1872-7336 J9 PARALLEL COMPUT JI Parallel Comput. PD FEB PY 2005 VL 31 IS 2 BP 185 EP 204 DI 10.1016/j.parco.2005.02.005 PG 20 WC Computer Science, Theory & Methods SC Computer Science GA 932NV UT WOS:000229561300004 ER PT J AU Price, JR Gee, TF AF Price, JR Gee, TF TI Face recognition using direct, weighted linear discriminant analysis and modular subspaces SO PATTERN RECOGNITION LA English DT Article DE face recognition; linear discriminant analysis; dimensionality reduction; pairwise Fisher criteria ID REDUCTION; MODEL AB We present a modular linear discriminant analysis (LDA) approach for face recognition. A set of observers is trained independently on different regions of frontal faces and each observer projects face images to a lower-dimensional subspace. These lower-dimensional subspaces are computed using LDA methods, including a new algorithm that we refer to as direct, weighted LDA or DW-LDA. DW-LDA combines the advantages of two recent LDA enhancements, namely direct LDA (DLDA) and weighted pairwise Fisher criteria. Each observer performs recognition independently and the results are combined using a simple sum-rule. Experiments compare the proposed approach to other face recognition methods that employ linear dimensionality reduction. These experiments demonstrate that the modular LDA method performs significantly better than other linear subspace methods. The results also show that D-LDA does not necessarily perform better than the well-known principal component analysis followed by LDA approach. This is an important and significant counterpoint to previously published experiments that used smaller databases. Our experiments also indicate that the new DW-LDA algorithm is an improvement over D-LDA. (C) 2004 Pattern Recognition Society. Published by Elsevier Ltd. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Price, JR (reprint author), Oak Ridge Natl Lab, POB 2008,MS-6010, Oak Ridge, TN 37831 USA. EM pricejr@ornl.gov NR 29 TC 37 Z9 39 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0031-3203 J9 PATTERN RECOGN JI Pattern Recognit. PD FEB PY 2005 VL 38 IS 2 BP 209 EP 219 DI 10.1016/j.patcog.2004.07.001 PG 11 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA 874KP UT WOS:000225349600005 ER PT J AU Becquart, CS Schaublin, RE Wirth, BD AF Becquart, CS Schaublin, RE Wirth, BD TI Microstructural processes in irradiated materials. Selected papers from the symposium held as part of the 2003 TMS Annual Meeting, San Diego, California, 2-6 March, 2003 - Preface SO PHILOSOPHICAL MAGAZINE LA English DT Editorial Material C1 CNRS, Lab Met Phys & Genie Mat, F-59655 Villeneuve Dascq, France. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Becquart, CS (reprint author), CNRS, Lab Met Phys & Genie Mat, F-59655 Villeneuve Dascq, France. RI Wirth, Brian/O-4878-2015; Schaeublin, Robin/O-1426-2016 OI Wirth, Brian/0000-0002-0395-0285; Schaeublin, Robin/0000-0002-8379-9705 NR 0 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 399 EP 399 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800001 ER PT J AU Miller, MK Russell, KF Sokolov, MA Nanstad, RK AF Miller, MK Russell, KF Sokolov, MA Nanstad, RK TI Atom probe tomography of radiation-sensitive KS-01 weld SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate AB An atom probe tomography characterization has been performed on a neutron-irradiated (fluence=0.8 x 10(19) n cm(-2) (E > 1 MeV)) high copper (0.37%), high manganese (1.64%), high nickel (1.23%) and high chromium (0.47%) KS-01 test weld. This weld exhibited a high sensitivity to neutron irradiation. Atom probe tomography revealed that there was an unusually high supersaturation of copper in the matrix after the stress relief treatment, which resulted in a high number density (3 x 10(24) m(-3)) of Cu-Mn-Ni-enriched precipitates after neutron irradiation. Their average size and composition were estimated to be =2.6+/-10.5nm and Fe-17.0+/-9.7 at% Cu, 31.9+/-13.8% Ni, 31.7+/-11.8% Mn. Phosphorus clusters and a Cr-, Mn-, Ni-, Cu-, C-, N-, Si- and Mo-enriched atmosphere, possibly associated with a dislocation, were also observed in the neutron irradiated material. Nickel, manganese, silicon, phosphorus and carbon segregation to a grain boundary were observed in the unirradiated condition. The microstructural and mechanical response to irradiation was consistent with other lower solute level steels. C1 Oak Ridge Natl Lab, Microscopy Microanal Microstruct Grp, Div Met & Ceram, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Radiat Mat Sci & Technol Grp, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Miller, MK (reprint author), Oak Ridge Natl Lab, Microscopy Microanal Microstruct Grp, Div Met & Ceram, POB 2008,Bldg 4500S, Oak Ridge, TN 37831 USA. EM millermk@ornl.gov NR 12 TC 9 Z9 9 U1 0 U2 2 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 401 EP 408 DI 10.1080/0267837041233132060 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800002 ER PT J AU Schwartz, AJ Wall, MA Zocco, TG Wolfer, WG AF Schwartz, AJ Wall, MA Zocco, TG Wolfer, WG TI Characterization and modelling of helium bubbles in self-irradiated plutonium alloys SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate AB The self-irradiation damage generated by alpha decay of Pu results in the formation of lattice defects and helium and uranium atoms. Over time, microstructural evolution as a result of the self-irradiation may influence the physical and mechanical properties of the material. Transmission electron microscopy investigations of Pu-Ga alloys ranging in age up to 42 years old, reveal the presence of nanometre-sized helium bubbles. The number density of bubbles and the average size have been determined for eight different age materials. The nucleation and growth of these bubbles have been modelled with rate equations. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Schwartz, AJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM schwartz@poptop.llnl.gov NR 14 TC 54 Z9 57 U1 2 U2 12 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 479 EP 488 DI 10.1080/02678370412331320026 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800008 ER PT J AU Kirk, MA Davidson, RS Jenkins, ML Twesten, RD AF Kirk, MA Davidson, RS Jenkins, ML Twesten, RD TI Measurement of diffuse electron scattering by single nanometre-sized defects in gold SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate ID COPPER AB Diffuse elastic scattering of electrons by single nanometre-sized defects in ion-irradiated Au has been measured quantitatively. Diffuse scattering from isolated single dislocation loops is separated from Bragg scattering at a weakly excited diffraction peak. Results are compared among several dislocation loop geometries and published calculations for diffuse scattering of x-rays. The pattern in the diffuse scattering within a single reciprocal lattice plane reveals the loop geometry and interstitial or vacancy nature. C1 Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. Univ Oxford, Dept Mat, Oxford OX1 3PH, England. Seitz Mat Res Lab, Ctr Microanal Mat, Urbana, IL 61801 USA. RP Kirk, MA (reprint author), Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. EM kirk@anl.gov NR 5 TC 9 Z9 9 U1 0 U2 7 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 497 EP 507 DI 10.1080/02678370412331320189 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800010 ER PT J AU Gao, F Weber, WJ AF Gao, F Weber, WJ TI Atomic-level computer simulation of SiC: defect accumulation, mechanical properties and defect recovery SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate ID SILICON-CARBIDE; INDUCED AMORPHIZATION; NEUTRON-IRRADIATION; MOLECULAR-DYNAMICS; ION; DISORDER; ENERGY AB Damage accumulation simulated previously (F. Gao and W.J. Weber, Phys. Rev. B 66 024106 (2002)) has been used to Study volume swelling of 3C-SiC, and to calculate the clastic constants, bulk and elastic moduli of the cascade-amorphized SiC. The swelling increases rapidly with dose at low-dose levels, but the rate of increase decreases dramatically at higher dose with a saturation volume change of 8.2% for the cascade-amorphized state. The elastic constants in the cascade-amorphized SiC decrease by about 19, 29 and 46% for C-11, C-12 and C-44, respectively, and 23% for bulk and elastic moduli. In order to understand defect annealing of damage accumulation, the stable Frenkel pairs created at low-energy events have been annealed at different temperatures, using molecular dynamics methods, to determine the time required for interstitials to recombine with vacancies. The results show that the low activation energies qualitatively overlap with experimental values determined for defect recovery below 300 K. Thus, the present results Suggest that this experimental recovery stage is associated with the spontaneous recovery of Frenkel pairs. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Gao, F (reprint author), Pacific NW Natl Lab, MS K8-93,POB 999, Richland, WA 99352 USA. EM fei.gao@pnl.gov RI Weber, William/A-4177-2008; Gao, Fei/H-3045-2012 OI Weber, William/0000-0002-9017-7365; NR 21 TC 7 Z9 7 U1 0 U2 13 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 509 EP 518 DI 10.1080/02678370412331320170 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800011 ER PT J AU Sun, K Wang, LM Ewing, RC Weber, WJ AF Sun, K Wang, LM Ewing, RC Weber, WJ TI Effects of electron irradiation in nuclear waste glasses SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals-Metals-and-Materials-Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Minerals Met & Mat Soc ID PHASE-SEPARATION; BOROSILICATE GLASSES; METALLIC GLASSES; MICROSCOPY; DIFFRACTION; ORDER; OXIDE AB This article summarizes recent studies of electron irradiation damage in sodium borosilicate, iron phosphate and aluminophosphate glass waste forms using a modern analytical electron microscope. Three different borosilicate (wt%) (17.72% B2O3 - 16.67% Na2O - 64.61% SiO2, 17.78% B2O3 - 15.83% Na2O - 61.39% SiO2 - 4.99% Fe2O3 and 17.86% B2O3 - 15.90% Na2O - 61.63% SiO2 - 4.61% FeO) and iron phosphate (mol%) (45% Fe2O3 - 55% P2O5, 20% Fe2O3 - 80% P2O5, and 20% Fe2O3 - 20% Na2O - 60% P2O5) glasses, and an aluminophosphate (mol%) (44.5% P2O5 - 31.5% Al2O3 - 20.2% Na2O - 3.8% K2O) glass were studied. Results indicate that all these glasses decomposed under the 200 kV electron irradiation (at doses higher than 1.0 x 10(26) e m(-2)). Migration of alkali elements from the irradiated centres to the peripheries under irradiation occurred in the alkali element-containing glasses, which results in the formation of alkali element-depleted and -enriched phases. Formation of bubbles was only observed in the alkali element-containing iron phosphate and aluminophosphate glasses, not in sodium borosilicate glasses when irradiated over a broad of dose rates (1.6 x 10(22) e m(-2) s to 8 x 10(26) e m(-2) s). Separation of boron-rich phase from silicon-rich phase, iron-rich/aluminium-rich phase from phosphorous-rich domains were observed in the three types of glasses, respectively. Further irradiation resulted in formation of small particles. In Fe-containing borosilicate glasses, the Fe is associated with the boron-rich phases after phase separation. C1 Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA. EM lmwang@umich.edu RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 29 TC 16 Z9 17 U1 0 U2 9 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 1478-6435 EI 1478-6443 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 597 EP 608 DI 10.1080/02678370412331320080 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800020 ER PT J AU Busby, JT Sowa, MM Was, GS Simonen, EP AF Busby, JT Sowa, MM Was, GS Simonen, EP TI Post-irradiation annealing of small defect clusters SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate ID NEUTRON-IRRADIATION; STAINLESS-STEELS; EVOLUTION; BUBBLES AB Post-irradiation annealing studies indicate small defect clusters may be a potential contributor to IASCC. In this study, small defect clusters and their behavior during annealing are examined. A CP-304 SS alloy was irradiated with 3.2 MeV protons to 0.17 dpa at <75degreesC. The increase in hardness after 0.17 dpa at <75degreesC was greater than that after 0.55 dpa at 360degreesC, but dropped significantly after annealing at 350degreesC for short times, although, no dislocation damage was observed using transmission electron microscopy (TEM). For samples irradiated in a previous study at 360degreesC, the smallest dislocation loops and clusters were removed preferentially during annealing at 500degreesC for 45 minutes. Computer simulations of the annealing behavior were performed for the data from both sets of experiments in order to gain further insight into the nature of small clusters. C1 Univ Michigan, Ann Arbor, MI 48109 USA. Pacific NW Natl Lab, Richland, WA USA. RP Busby, JT (reprint author), Univ Michigan, Ann Arbor, MI 48109 USA. EM jbusby@engin.umich.edu NR 21 TC 4 Z9 4 U1 0 U2 5 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 609 EP 617 DI 10.1080/02678370412331320071 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800021 ER PT J AU Gao, F Heinisch, H Kurtzt, RJ Osetsky, YN Hoagland, RG AF Gao, F Heinisch, H Kurtzt, RJ Osetsky, YN Hoagland, RG TI Migration and directional change of interstitial clusters in alpha-Fe: searching for transition states by the dimer method SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals-Metals-and-Materials-Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Minerals Met & Mat Soc ID SCALE COMPUTER-SIMULATION; DEFECT PRODUCTION; CASCADES; METALS; IRON AB The interstitial clusters produced by cascades in metals have very high mobility and exhibit thermally activated, one-dimensional glide along (111) directions. Only small interstitial Clusters (<4) are observed to change their glide direction during the period of molecular dynamics (MD) Simulations (similar to10ns), but the directional change for larger Clusters is inaccessible to MD due to the limited time-scale. In order to overcome the 'time barrier' in MD simulations, the dimer method is employed to search for possible transition states of interstitials and small interstitial clusters in alpha-Fe. The method uses only the first derivatives of the potential energy to find saddle points without knowledge of the filial state of the transition. The possible transition states are Studied as a function of interstitial cluster size, and the lowest energy barriers correspond to defect migration along (111) directions, as seen in MD simulations. Small clusters change their direction by a (110) fragment mechanism involving rotation of each crowdion into and out of the (110) dumbbell configuration, whereas the directional change for larger clusters is a two-step process consisting of translation along a (100) direction and rotation into an equivalent (111) direction. The mechanism of changing direction for a tri-interstitial cluster is also investigated using MD simulations. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Liverpool, Dept Engn, Liverpool L69 3GH, Merseyside, England. RP Gao, F (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM fei.gao@pnl.gov RI Hoagland, Richard/G-9821-2012; Gao, Fei/H-3045-2012 NR 11 TC 8 Z9 8 U1 0 U2 4 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 EI 1478-6443 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 619 EP 627 DI 10.1080/02678370412331320062 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800022 ER PT J AU Glade, SC Wirht, BD Odettes, GR Asoka-Kumar, P Sterne, PA Howell, RH AF Glade, SC Wirht, BD Odettes, GR Asoka-Kumar, P Sterne, PA Howell, RH TI Positron annihilation spectroscopy and small-angle neutron scattering characterization of the effect of Mn on the nanostructural features formed in irradiated Fe-Cu-Mn alloys SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate ID PRESSURE-VESSEL STEELS; PRECIPITATION; EMBRITTLEMENT AB The size, number density, and composition of the nanometre-sized defects responsible for the hardening and embrittlement in irradiated Fe-0.9 wt% Cu and Fe-0.9 wt% Cu-1.0 wt% Mn model reactor pressure vessel alloys were measured using small-angle neutron scattering and positron annihilation spectroscopy. These alloys were irradiated at 290degreesC to relatively low neutron fluences (E > 1 MeV, 6.0 x 10(20) to 4.0 x 10(21) n m(-2)) in order to study the effect of manganese on the nucleation and growth of copper-rich precipitates and secondary defect features. Copper-rich precipitates were present in both alloys following irradiation. The effect of Mn was to reduce the size and increase the number density of precipitates in the Fe-Cu-Mn alloy relative to the Fe-CU alloy. Vacancy clusters were observed in the Fe-Cu alloy, but not in the Fe-Cu-Mn alloy. These results suggest a strong effect of Mn on vacancy diffusion and clustering. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. Univ Calif Santa Barbara, Dept Mech & Environm Engn, Santa Barbara, CA 93106 USA. RP Glade, SC (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94550 USA. EM glade1@llnl.gov RI Wirth, Brian/O-4878-2015 OI Wirth, Brian/0000-0002-0395-0285 NR 22 TC 26 Z9 26 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 629 EP 639 DI 10.1080/02678370412331320053 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800023 ER PT J AU Hudson, TS Dudarev, SL Caturlas, MJ Sutton, AP AF Hudson, TS Dudarev, SL Caturlas, MJ Sutton, AP TI Effects of elastic interactions on post-cascade radiation damage evolution in kinetic Monte Carlo simulations SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals-Metals-and-Materials-Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Minerals Met & Mat Soc ID MOLECULAR-DYNAMICS; ALPHA-FE; IRRADIATION; IRON; CU; COLLAPSE AB We describe a series of kinetic Monte Carlo simulations of post-cascade radiation damage evolution in alpha-iron that illustrates the part played by elastic interaction between defects. Elastic interactions are included as a bias to the diffusion of mobile point defects and defect clusters. The simulations show that recombination fractions are reduced, and vacancy clustering is enhanced. The sensitivity of these effects to temperature, cascade energy, and geometric description of vacancy clusters is also investigated. C1 Univ Oxford, Dept Mat, Oxford OX1 3PH, England. UKAEA, EURATOM, Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England. Univ Alicante, Fac Ciencias, Dept Fis Aplicada, E-03690 Alicante, Spain. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. Helsinki Univ Technol, Lab Computat Engn, FIN-02150 Espoo, Finland. RP Hudson, TS (reprint author), Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England. EM toby.hudson@materials.oxford.ac.uk RI Hudson, Toby/B-3856-2012; OI Hudson, Toby/0000-0002-3348-3622 NR 19 TC 15 Z9 15 U1 1 U2 6 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 661 EP 675 DI 10.1080/14786430412331320026 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800026 ER PT J AU Zepeda-Ruiz, LA Marian, J Wirths, BD AF Zepeda-Ruiz, LA Marian, J Wirths, BD TI On the character of self-interstitial dislocation loops in vanadium SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals-Metals-and-Materials-Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Minerals Met & Mat Soc ID IRON; SIMULATIONS; CASCADES; CLUSTERS AB Molecular statics and molecular dynamics simulations based on a new Finnis-Sinclair potential were used to investigate the energy and structure of self-interstitial atom (SIA) dislocation loops in vanadium. The results are compared to experimental observations and recent results in ferritic alloys which detail the formation mechanism responsible for the nucleation and growth mechanism of (100) dislocation loops. The SIA dislocation loops in vanadium are composed of (111) split dumbbells and crowdions. The clusters can be described as perfect prismatic dislocation loops with Burgers vector b = 1/2 (111). As the loops grow, SIAs fill successive jogged-edge rows with minimum free-energy cusps corresponding to unjogged filled hexagonal shells. Notably, dislocation loops of (100) Burgers vector are not observed in vanadium, and these results provide a basis for understanding the experimental observations. C1 Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. CALTECH, Grad Aeronaut Labs, Pasadena, CA 91125 USA. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. RP Wirths, BD (reprint author), Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. EM bdwirth@nuc.berkeley.edu RI Wirth, Brian/O-4878-2015 OI Wirth, Brian/0000-0002-0395-0285 NR 16 TC 2 Z9 2 U1 1 U2 5 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 697 EP 702 DI 10.1080/14786430412331319983 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800029 ER PT J AU Jing, P Khrasihi, T Young, JA Wirths, BD AF Jing, P Khrasihi, T Young, JA Wirths, BD TI Multi-scale simulations of the effects of irradiation-induced voids and helium bubbles on the mechanical properties of aluminium SO PHILOSOPHICAL MAGAZINE LA English DT Article; Proceedings Paper CT Symposium on Microstructural Process in Irradiated Materials held at the Annual Meeting of the Minerals, Metals and Materials Society CY MAR 02-06, 2003 CL San Diego, CA SP Oak Ridge Natl Lab, Metal & Ceram Div, Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate ID AUSTENITIC STAINLESS-STEEL; DYNAMICS SIMULATIONS; DISLOCATION DYNAMICS; BCC METALS; MICROSTRUCTURE; DEFORMATION; POTENTIALS; NUCLEATION; DEPENDENCE; STRESS AB As a result or irradiation, pressurized helium bubbles are observed in large number densities in some metals, which produce mechanical property changes. This paper presents the results of a computational multi-scale study (dislocation dynamics, DD, and molecular dynamics simulations, MD) to quantify the effect of He bubbles on material hardening from the impediment to dislocation motion. The effects of voids were studied using MD, and the effects of He bubbles, with a mean size of 2.5 nm and number densities from 3 x 10(22) m(-3) to 6 x 10(22) m(-3), were investigated using DD over a range of internal He pressures ranging from 125 to 750 MPa. The MD simulations elucidated the dislocation pinning action of voids and bubbles. Also, within the range of parameters studied, the DD simulations showed a clear, but weak correlation between the number density of He bubbles, and the internal He pressure, on the flow stress of the metal. C1 Univ New Mexico, Dept Mech Engn, Albuquerque, NM 87131 USA. Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94551 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Khrasihi, T (reprint author), Univ New Mexico, Dept Mech Engn, Albuquerque, NM 87131 USA. EM khraishi@me.unm.edu RI Wirth, Brian/O-4878-2015 OI Wirth, Brian/0000-0002-0395-0285 NR 32 TC 3 Z9 4 U1 0 U2 9 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1478-6435 J9 PHILOS MAG JI Philos. Mag. PD FEB-MAR PY 2005 VL 85 IS 4-7 SI SI BP 757 EP 767 DI 10.1080/14786430412331319958 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 892ZZ UT WOS:000226689800034 ER PT J AU Calderon, HA Kostorz, G Calzado-Lopez, L Kisielowski, C Mori, T AF Calderon, HA Kostorz, G Calzado-Lopez, L Kisielowski, C Mori, T TI High-resolution electron-microscopy analysis of splitting patterns in Ni alloys SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID ELASTICALLY STRESSED SOLIDS; PRECIPITATE EVOLUTION; DYNAMICS; SYSTEMS; SHAPE AB The late stages of coarsening of coherent solid particles is strongly influenced by the reduction of elastic strain energy. This produces migration and alignment of particles as well as some other effects. In this investigation, the origin of the so-called splitting pattern arrangement of gamma' precipitate particles, an arrangement which has often been interpreted as being due to splitting of a larger particle into smaller ones, has been studied. The two-particle relationship as to whether they are in-phase or out-of-phase is examined by means of a translation order domain analysis of high-resolution electron-microscopy images along a zone axis parallel to [001]. Ni alloys have been used for the investigation including a binary Ni-Al alloy (producing different volume fractions) and two commercial multicomponent alloys with high volume fraction. About 72% of two-particle pairs forming the splitting configuration are in the out-of-phase relationship, indicating that adjacent pairs are randomly formed and that they are not formed by the splitting of a large particle. In addition, an elasticity analysis shows that the elastic interaction energy of two gamma' particles exhibits a minimum at a certain separation distance along [100]. C1 IPN, ESFM, Dept Ciencia Mat, Mexico City 07738, DF, Mexico. Swiss Fed Inst Technol, Inst Angew Phys, Zurich, Switzerland. Univ Calif Berkeley, LBNL, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. Univ Manchester, Ctr Mat Sci, Manchester, Lancs, England. CNRS, CEMES, Toulouse, France. RP Calderon, HA (reprint author), IPN, ESFM, Dept Ciencia Mat, Mexico City 07738, DF, Mexico. EM hcalderon@ipn.mx RI kostorz, gernot/B-6489-2009 NR 12 TC 5 Z9 5 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD FEB PY 2005 VL 85 IS 2 BP 51 EP 59 DI 10.1080/09500830500164237 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA 940GO UT WOS:000230131900001 ER PT J AU Goeckner, HP Claus, H Kouvel, JS AF Goeckner, HP Claus, H Kouvel, JS TI Vortex-flux anomalies in MgB2 polycrystals SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article DE MgB2 polycrystals; abrupt magnetization decrease; anomalous remanence vs. temperature; vortex pinning forces ID BULK SUPERCONDUCTORS AB For two MgB2 polycrystalline samples prepared differently, magnetic hysteresis loops at 4.2 K revealed some striking magnetization (M) anomalies at low magnetic fields (H). In one sample, M drops abruptly by an amount that diminishes to zero as the maximum M, reached just before the drop, is reduced below a critical value (by reducing the slowly cycled H). The remanent magnetization (M-rem), measured as the temperature (T) was slowly raised from 4.2 K to T-c (39 K), was seen to decrease very rapidly just above 4.2 K and then remain constant up to similar to20 K, where it starts to descend gradually to zero at T-c. A similar set of anomalies was observed with the second sample, but where the hysteretic drop of M is rapid but not abrupt. However, both samples showed that the vortex-flux component of M remains nearly constant over a range of H just before the rapid drop of All, indicating that the vortices in the sample stay fairly constant in number before many of them exit the sample rapidly. For both MgB2, samples, this whole set of anomalous properties disappears at temperatures above 5 K, where the slow steady descent of M-rem as T increases to T-c indicates that the size distribution of vortex pinning forces extends tip to very high values. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Illinois, Dept Phys, Chicago, IL 60607 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Goeckner, HP (reprint author), Univ Illinois, Dept Phys, Chicago, IL 60607 USA. EM kouvel@uic.edu NR 11 TC 6 Z9 6 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 FEB 1 PY 2005 VL 418 IS 3-4 BP 93 EP 98 DI 10.1016/j.physc.2004.11.008 PG 6 WC Physics, Applied SC Physics GA 895FZ UT WOS:000226847600001 ER PT J AU Wilke, RHT Bud'ko, SL Canfield, PC Kramer, MJ Wu, YQ Finnemore, DK Suplinskas, RJ Marzik, JC Hannahs, ST AF Wilke, RHT Bud'ko, SL Canfield, PC Kramer, MJ Wu, YQ Finnemore, DK Suplinskas, RJ Marzik, JC Hannahs, ST TI Superconductivity in MgB2 doped with Ti and C SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID CRITICAL-CURRENT DENSITY; MAGNESIUM DIBORIDE; BULK MGB2; CONDUCTORS AB Measurements of the superconducting tipper critical field, H-c2, and critical current density, J(c) have been carried out for MgB2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB2 lattice and apparently shortens the electronic mean free path of MgB2 and raising H-c2. Titanium forms precipitates of either TiB or TiB2 that enhance the flux pinning and raise J(c). Most of these precipitates are intra-granular in the MgB2 phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB2 lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB2, the resulting superconductor has H-mu0(c2)(T = 0) similar to 25 T and J(c) similar to 10,000 A/cm(2) at 5 K and 2.2 T. (C) 2004 Elsevier B.V. All rights reserved. C1 Iowa State Univ, Ames Lab, Dept Phys, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Specialty Mat Inc, Lowell, MA 01851 USA. Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. RP Finnemore, DK (reprint author), Iowa State Univ, Ames Lab, Dept Phys, Ames, IA 50011 USA. EM finnemor@ameslab.gov RI Hannahs, Scott/B-1274-2008; Canfield, Paul/H-2698-2014 OI Hannahs, Scott/0000-0002-5840-7714; NR 13 TC 13 Z9 13 U1 1 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 1 PY 2005 VL 418 IS 3-4 BP 160 EP 167 DI 10.1016/j.physc.2004.11.022 PG 8 WC Physics, Applied SC Physics GA 895FZ UT WOS:000226847600009 ER PT J AU Fradkin, L Langof, L Lifshitz, E Gaponik, N Rogach, A Eychmuller, A Weller, H Micic, OI Nozik, AJ AF Fradkin, L Langof, L Lifshitz, E Gaponik, N Rogach, A Eychmuller, A Weller, H Micic, OI Nozik, AJ TI A direct measurement of g-factors in II-VI and III-V core-shell nanocrystals SO PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES LA English DT Article; Proceedings Paper CT 3rd International Conference on Quantum Dots (QD 2004) CY MAY 10-13, 2004 CL Max Bell Bldg Banff Ctr, Banff, CANADA HO Max Bell Bldg Banff Ctr DE colloidal quantum dots; core-shell nanocrystals; g-factors; ODMR ID DETECTED MAGNETIC-RESONANCE; INP QUANTUM DOTS; POLARIZED PHOTOLUMINESCENCE; TEMPERATURE AB This study describes a direct measurement of spectroscopic g-factors of photo-generated carriers in lnP/ZnS and HgTe/HgxCd1-xTe(S) core-shell nanocrystals. The g-factor of trapped electrons and their spin-lattice versus radiative relaxation ratio (T-1/tau) were measured by the use of continuous-wave and time-resolved optically detected magnetic resonance (ODMR) spectroscopy. The g-factors of excitons and donor-hole pairs were derived by the use of field-induced circular-polarized photoluminescence (CP-PL) spectroscopy. The combined information enabled to determine the g-factors of the individual band-edge electrons and holes. The results suggested an increase of the g-factor of the exciton and conduction electron with a decrease of the nanocrystal size. (C) 2004 Elsevier B.V. All rights reserved. C1 Technion Israel Inst Technol, Inst Solid State, Dept Chem, IL-32000 Haifa, Israel. Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany. Univ Munich, Dept Phys, D-80799 Munich, Germany. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Lifshitz, E (reprint author), Technion Israel Inst Technol, Inst Solid State, Dept Chem, IL-32000 Haifa, Israel. EM ssefrat@tx.technion.ac.il RI Eychmuller, Alexander/G-2354-2010; Weller, Horst/B-5715-2014; Nozik, Arthur/A-1481-2012; Nozik, Arthur/P-2641-2016; OI Gaponik, Nikolai/0000-0002-8827-2881 NR 15 TC 4 Z9 5 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD FEB PY 2005 VL 26 IS 1-4 BP 9 EP 13 DI 10.1016/j.physe.2004.08.013 PG 5 WC Nanoscience & Nanotechnology; Physics, Condensed Matter SC Science & Technology - Other Topics; Physics GA 900YA UT WOS:000227249000003 ER PT J AU Ishizumi, A White, CW Kanemitsu, Y AF Ishizumi, A White, CW Kanemitsu, Y TI Photoluminescence properties of impurity-doped ZnS nanocrystals fabricated by sequential ion implantation SO PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES LA English DT Article; Proceedings Paper CT 3rd International Conference on Quantum Dots (QD 2004) CY MAY 10-13, 2004 CL Max Bell Bldg Banff Ctr, Banff, CANADA HO Max Bell Bldg Banff Ctr DE nanocrystal; ion implantation; ZnS; photoluminescence ID BROAD-BAND LUMINESCENCES; CDS NANOCRYSTALS; OPTICAL-PROPERTIES; MECHANISM; EMISSION; PHOSPHORS AB We have studied photoluminescence (PL) spectrum and dynamics of Cu- and Al-doped ZnS (ZnS:Cu,Al) nanocrystals fabricated by sequential implantation of Zn (+), S (+), Cu (+), and Al (+) ions into Al2O3 matrices. These samples exhibit intense green PL under UV light excitation. The space- and time-resolved PL measurements show that the broad green PL is due to the donor acceptor (DA) pair luminescence of single ZnS:Cu,Al nanocrystals. (C) 2004 Elsevier B.V. All rights reserved. C1 Kyoto Univ, Int Res Ctr Elements Sci, Inst Chem Res, Uji, Kyoto 6100011, Japan. Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300192, Japan. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN USA. RP Kanemitsu, Y (reprint author), Kyoto Univ, Int Res Ctr Elements Sci, Inst Chem Res, Uji, Kyoto 6100011, Japan. EM kanemitu@scl.kyoto-u.ac.jp NR 14 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD FEB PY 2005 VL 26 IS 1-4 BP 24 EP 27 DI 10.1016/j.physe.2004.08.016 PG 4 WC Nanoscience & Nanotechnology; Physics, Condensed Matter SC Science & Technology - Other Topics; Physics GA 900YA UT WOS:000227249000006 ER PT J AU Hertlein, MP Adaniya, H Cole, K Feinberg, B Maddi, J Prior, MH Schriel, R Belkacem, A AF Hertlein, MP Adaniya, H Cole, K Feinberg, B Maddi, J Prior, MH Schriel, R Belkacem, A TI Electron correlation during photoionization and relaxation of potassium and argon after K-shell photoexcitation SO PHYSICAL REVIEW A LA English DT Article ID SYNCHROTRON RADIATION; ION CHARGE; EDGE; YIELDS; AUGER; THRESHOLD; COINCIDENCE; SPECTRA AB We have measured the charge-state distributions of argon and potassium after ionization by photons with energies near the K-shell ionization threshold. Despite the similarity in core electron configurations, the two atoms show remarkable differences in the resulting distribution of ion charge states. The valence electron in potassium is rarely a spectator during core relaxation, and its presence enhances the loss of electrons excited into Rydberg levels or strongly reduces the recapture of slow photoelectrons during postcollision interaction. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Hertlein, MP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 17 TC 4 Z9 4 U1 2 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 FEB PY 2005 VL 71 IS 2 AR 022702 DI 10.1103/PhysRevA.71.022702 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 904GK UT WOS:000227483900061 ER PT J AU Kevrekidis, PG Frantzeskakis, DJ Carretero-Gonzalez, R Malomed, BA Herring, G Bishop, AR AF Kevrekidis, PG Frantzeskakis, DJ Carretero-Gonzalez, R Malomed, BA Herring, G Bishop, AR TI Statics, dynamics, and manipulations of bright matter-wave solitons in optical lattices SO PHYSICAL REVIEW A LA English DT Article ID BOSE-EINSTEIN CONDENSATION; NONLINEAR SCHRODINGER-EQUATIONS; PERIODIC POTENTIALS; HAMILTONIAN-SYSTEMS; STABILITY THEORY; SOLITARY WAVES; NOBEL LECTURE; DARK SOLITONS; ATOM OPTICS; ARRAYS AB Motivated by the recent experimental achievements in the work with Bose-Einstein condensates (BECs), we consider bright matter-wave solitons, in the presence of a parabolic magnetic trap and a spatially periodic optical lattice (OL), in the attractive BEC. We examine pinned states of the soliton and their stability by means of perturbation theory. The analytical predictions are found to be in good agreement with numerical simulations. We then explore possibilities to use a time-modulated OL as a means of stopping and trapping a moving soliton, and of transferring an initially stationary soliton to a prescribed position by a moving OL. We also study the emission of radiation from the soliton moving across the combined magnetic trap and OL. We find that the soliton moves freely (without radiation) across a weak lattice, but suffers strong loss in deeper OLs. C1 Univ Massachusetts, Dept Math & Stat, Amherst, MA 01003 USA. Univ Athens, Dept Phys, Athens 15784, Greece. San Diego State Univ, Dept Math & Stat, Nonlinear Dynam Syst Grp, San Diego, CA 92182 USA. Tel Aviv Univ, Fac Engn, Dept Interdisciplinary Studies, IL-69978 Tel Aviv, Israel. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Kevrekidis, PG (reprint author), Univ Massachusetts, Dept Math & Stat, Amherst, MA 01003 USA. NR 57 TC 28 Z9 28 U1 0 U2 2 PU AMER 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 FEB PY 2005 VL 71 IS 2 AR 023614 DI 10.1103/PhysRevA.71.023614 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 904GK UT WOS:000227483900100 ER PT J AU Sapirstein, J Cheng, KT AF Sapirstein, J Cheng, KT TI Calculation of radiative corrections to E1 matrix elements in the neutral alkali metals SO PHYSICAL REVIEW A LA English DT Article ID PARITY NONCONSERVATION; OSCILLATOR-STRENGTHS; LIFETIME; LITHIUM; ATOMS; STATE; ENERGIES; CESIUM AB Radiative corrections to E1 matrix elements for ns-np transitions in the alkali-metal atoms lithium through francium are evaluated. They are found to be small for the lighter alkali metals but significantly larger for the heavier alkali metals, and in the case of cesium much larger than the experimental accuracy. The relation of the matrix element calculation to a recent decay rate calculation for hydrogenic ions is discussed, and application of the method to parity nonconservation in cesium is described. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Sapirstein, J (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. EM jsapirst@nd.edu; ktcheng@llnl.gov NR 24 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB PY 2005 VL 71 IS 2 AR 022503 DI 10.1103/PhysRevA.71.022503 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 904GK UT WOS:000227483900049 ER PT J AU Alvarez-Garcia, J Barcones, B Perez-Rodriguez, A Romano-Rodriguez, A Morante, JR Janotti, A Wei, SH Scheer, R AF Alvarez-Garcia, J Barcones, B Perez-Rodriguez, A Romano-Rodriguez, A Morante, JR Janotti, A Wei, SH Scheer, R TI Vibrational and crystalline properties of polymorphic CuInC2 (C=Se,S) chalcogenides SO PHYSICAL REVIEW B LA English DT Article ID CHALCOPYRITE SEMICONDUCTORS; RAMAN-SCATTERING; SOLAR-CELLS; CUINSE2; FILMS; POLYTYPES AB This paper deals with the analysis of the vibrational and crystallographic properties of CuInC2 (C=S,Se) chalcogenides. Experimentally, evidence on the coexistence in epitaxial layers of domains with different crystalline order-corresponding to the equilibrium chalcopyrite (CH) and to CuAu (CA)-has been obtained by cross section transmission electron microsopy (TEM) and high resolution TEM (HREM). Electron diffraction and HREM images give the crystalline relationship [1 (1) over bar0](CH)parallel to[100](CA) and (112)(CH)parallel to(011)(CA), observing the existence of a (112)(CH)parallel to(001)(CA) interphase between different ordered domains. The vibrational properties of these polytypes have been investigated by Raman scattering. Raman scattering, in conjunction with XRD, has allowed identifying the presence of additional bands in the Raman spectra with vibrational modes of the CA ordered phase. In order to interpret these spectra, a valence field force model has been developed to calculate the zone-center vibrational modes of the CA structure for both CuInS2 and CuInSe2 compounds. The results of this calculation have led to the identification, in both cases, of the main additional band in the spectra with the total symmetric mode from the CuAu lattice. This identification is also supported by first-principles frozen-phonon calculations. Finally, the defect structure at the interphase boundaries between different polymorphic domains has also been investigated. C1 CRIC, Barcelona 08017, Spain. Univ Barcelona, EME,CEMIC, CERMAE, Dept Elect, E-08028 Barcelona, Spain. Natl Renewable Energy Lab, Golden, CO 80401 USA. Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany. RP Alvarez-Garcia, J (reprint author), CRIC, MArgallo 12 Les Planes, Barcelona 08017, Spain. RI Romano-Rodriguez, Albert/C-7564-2012; Morante, J.R./A-4480-2014; Janotti, Anderson/F-1773-2011 OI Romano-Rodriguez, Albert/0000-0002-4999-6588; Morante, J.R./0000-0002-4981-4633; Janotti, Anderson/0000-0001-5028-8338 NR 25 TC 68 Z9 69 U1 4 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054303 DI 10.1103/PhysRevB.71.054303 PG 9 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400045 ER PT J AU Benedict, LX Klepeis, JE Streitz, FH AF Benedict, LX Klepeis, JE Streitz, FH TI Calculation of optical absorption in Al across the solid-to-liquid transition SO PHYSICAL REVIEW B LA English DT Article ID POLYVALENT METALS; ALUMINUM; TEMPERATURES; SODIUM AB We calculate the optical-absorption spectrum of solid and liquid Al for temperatures between 0 and 1800 K with an empirical pseudopotential technique. It is found that a prominent peak in the spectrum of the solid (at (h) over bar omega similar to 1.5 eV) smoothly disappears as the temperature is raised above T-melt=938 K. This is in agreement with earlier measurements on solid and liquid Al, but is in disagreement with more recent measurements on the liquid, in which the peak was seen to remain at T = 1550 K. Our results suggest that in situ optical constants measurements may be used as a diagnostic for the shock melting of Al. C1 Lawrence Livermore Natl Lab, Phys & Adv Technol Directorate, Div H, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, Phys & Adv Technol Directorate, Div H, POB 5508, Livermore, CA 94550 USA. NR 20 TC 8 Z9 8 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 FEB PY 2005 VL 71 IS 6 AR 064103 DI 10.1103/PhysRevB.71.064103 PG 5 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500016 ER PT J AU Bester, G Zunger, A Shumway, J AF Bester, G Zunger, A Shumway, J TI Broken symmetry and quantum entanglement of an exciton in InxGa1-xAs/GaAs quantum dot molecules SO PHYSICAL REVIEW B LA English DT Article ID 2 INTERACTING ELECTRONS; EXCHANGE INTERACTION; OPTICAL-PROPERTIES; STATES; COMPUTATION; SINGLE; STRAIN; LOCALIZATION; INFORMATION; ABSORPTION AB The ability of a quantum dot to confine photogenerated electron-hole pairs created interest in the behavior of such an exciton in a "dot molecule," being a possible register in quantum computing. When two quantum dots are brought close together, the quantum state of the exciton may extend across both dots. The exciton wave function in such a dot molecule may exhibit entanglement. Atomistic pseudopotential calculations of the wave function for an electron-hole pair in a dot molecule made of two identical InxGal-xAs/GaAs dots reveal that the common assumption of single-particle wave functions forming bonding and antibonding states is erroneous. The true behavior of single-particle electrons and holes leads to symmetry-broken excitonic two-particle wave functions, dramatically suppressing entanglement. We find that at large interdot separations, the exciton states are built from heteronuclear single-particle states while at small interdot separations the exciton is derived from heteronuclear hole states and homonuclear electron states. We calculate the entanglement of the excitons and find a maximum value of 80% at an interdot separation of 8.5 nm and very small values for larger and smaller distances. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA. RP Bester, G (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Bester, Gabriel/I-4414-2012; Zunger, Alex/A-6733-2013 OI Bester, Gabriel/0000-0003-2304-0817; NR 39 TC 66 Z9 66 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 7 AR 075325 DI 10.1103/PhysRevB.71.075325 PG 13 WC Physics, Condensed Matter SC Physics GA 911OJ UT WOS:000228013600075 ER PT J AU Bud'ko, SL Morosan, E Canfield, PC AF Bud'ko, SL Morosan, E Canfield, PC TI Anisotropic Hall effect in single-crystal heavy-fermion YbAgGe SO PHYSICAL REVIEW B LA English DT Article ID TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; SYSTEMS; ANTIFERROMAGNETISM; YBRH2SI2 AB Temperature- and field-dependent Hall effect measurements are reported for YbAgGe, a heavy-fermion compound exhibiting a field-induced quantum phase transition, and for two other closely related members of the RAgGe series: a nonmagnetic analog, LuAgGe and a representative, "good local moment," magnetic material, TmAgGe. Whereas the temperature-dependent Hall coefficient of YbAgGe shows behavior similar to what has been observed in a number of heavy-fermion compounds, the low temperature, field-dependent measurements reveal well-defined, sudden changes with applied field; in specific for H perpendicular to c a clear local maximum that sharpens as temperature is reduced below 2 K and that approaches a value of 45 kOe-a value that has been proposed as-the T=0 quantum critical point. Similar behavior was observed for H parallel to c where a clear minimum in the field-dependent Hall resistivity was observed at low temperatures. Although at our base temperatures it is difficult to distinguish between the field-dependent behavior predicted for (i) diffraction off a critical spin density wave or (ii) breakdown in the composite nature of the heavy electron, for both field directions there is a distinct temperature dependence of a feature that can clearly be associated with a field-induced quantum critical point at T=0 persisting up to at least 2 K. C1 Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. RI Canfield, Paul/H-2698-2014 NR 24 TC 28 Z9 28 U1 1 U2 11 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054408 DI 10.1103/PhysRevB.71.054408 PG 8 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400053 ER PT J AU Cantoni, C Verebelyi, DT Specht, ED Budai, J Christen, DK AF Cantoni, C Verebelyi, DT Specht, ED Budai, J Christen, DK TI Anisotropic nonmonotonic behavior of the superconducting critical current in thin YBa2Cu3O7-delta films on vicinal SrTiO3 surfaces SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL-CURRENT DENSITY; ANTIPHASE BOUNDARIES; EPITAXIAL DEPOSITION; TRANSPORT-PROPERTIES; SELF-ORGANIZATION; VORTICES; TAPES; MECHANISM; DEFECTS; OXIDE AB The critical current density of epitaxial YBa2Cu3O7-delta (YBCO) films grown on vicinal SrTiO3 Substrates was investigated by electrical transport measurements along and across the steps of the SrTiO3 surface for a range of temperatures of 10 to 85 K and in applied magnetic fields varying from 0 to 14 T. For vicinal angles of 4 degrees and 8 degrees, we found evidence of enhanced pinning in the longitudinal direction at low magnetic fields for a wide region of temperatures and attribute this phenomenon to antiphase boundaries in the YBCO film. The transverse J(c) data showed a peak in the J(c)(H) curve at low magnetic fields, which was explained on the basis of magnetic interaction between Abrikosov and Abrikosov-Josephson vortices. The in-plane J(c) anisotropy observed for vicinal angles of 0.4 degrees was reversed with respect to the 8 degrees and 4 degrees samples. This phenomenon was interpreted on the basis of strain induced in the YBCO film by the stepped substrate's surface. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Amer Superconductor Corp, Westborough, MA 01581 USA. RP Cantoni, C (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. RI Specht, Eliot/A-5654-2009; Cantoni, Claudia/G-3031-2013 OI Specht, Eliot/0000-0002-3191-2163; Cantoni, Claudia/0000-0002-9731-2021 NR 24 TC 15 Z9 15 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054509 DI 10.1103/PhysRevB.71.054509 PG 9 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400074 ER PT J AU Chung, JH Proffen, T Shamoto, S Ghorayeb, AM Croguennec, L Tian, W Sales, BC Jin, R Mandrus, D Egami, T AF Chung, JH Proffen, T Shamoto, S Ghorayeb, AM Croguennec, L Tian, W Sales, BC Jin, R Mandrus, D Egami, T TI Local structure of LiNiO2 studied by neutron diffraction SO PHYSICAL REVIEW B LA English DT Article ID TRIANGULAR LATTICE LINIO2; MAGNETIC-PROPERTIES; ORBITAL FRUSTRATION; SCATTERING; RESONANCE; BEHAVIOR AB The nature of the magnetic state of LiNiO2 has been controversial. In this compound Ni spins (S=1/2) form a triangular lattice with the possibility of magnetic frustration, but the exact state of spin correlation has not yet been known in spite of the extensive research work. A factor that complicates understanding of the magnetic state is the orbital state of Ni3+ which is a Jahn-Teller (JT) ion. While there is no signature of long-range Jahn-Teller distortion, local JT distortion has been suspected. We have performed neutron diffraction and atomic pair-density function analyses up to unprecedented large distances to discover a number of unusual features, such as anomalous peak broadening, local JT distortion, sharp oxygen-oxygen distance correlations, and inverted temperature dependence of medium range correlation. These observations are best explained by local orbital ordering of Ni3+ ions into three sublattices. This orbital ordering, however, cannot develop into long-range order because of the strain field it generates, and domains of about 10 nm in size are formed. Domains are susceptible to random pinning by impurities (site disorder) resulting in the loss of structural long-range order. We suggest that this local orbital ordering is the basis for the complex magnetic properties observed in this compound. C1 Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA. Univ Penn, Res Struct Matter Lab, Philadelphia, PA 19104 USA. Los Alamos Natl Lab, Lujan Ctr, Los Alamos, NM 87545 USA. JAERI, Neutron Sci Res Ctr, Tokai, Ibaraki 3191195, Japan. Univ Aix Marseille 3, CNRS, UMR 6137, Lab Mat & Microelect Provence, F-13397 Marseille, France. CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. RP Chung, JH (reprint author), Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA. RI Ghorayeb, Andre/B-3313-2010; Laurence, CROGUENNEC/E-4558-2010; Lujan Center, LANL/G-4896-2012; Tian, Wei/C-8604-2013; Mandrus, David/H-3090-2014; Proffen, Thomas/B-3585-2009; Croguennec, Laurence/R-9512-2016 OI Tian, Wei/0000-0001-7735-3187; Proffen, Thomas/0000-0002-1408-6031; Croguennec, Laurence/0000-0002-3018-0992 NR 30 TC 47 Z9 47 U1 0 U2 22 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064410 DI 10.1103/PhysRevB.71.064410 PG 11 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500044 ER PT J AU Clerouin, J Renaudin, P Laudernet, Y Noiret, P Desjarlais, MP AF Clerouin, J Renaudin, P Laudernet, Y Noiret, P Desjarlais, MP TI Electrical conductivity and equation-of-state study of warm dense copper: Measurements and quantum molecular dynamics calculations SO PHYSICAL REVIEW B LA English DT Article ID AUGMENTED-WAVE METHOD; METALS; TRANSITION AB Absolute measurements of the pressure and the electrical conductivity of expanded copper in the warm dense matter regime (rho=0.5-0.3 g/cm(3) and 6000 K < T < 30 000 K) are obtained in an isochoric plasma closed-vessel (EPI). Quantum molecular dynamics simulations are found to be in excellent agreement with the experimental results, allowing for a detailed interpretation of the optical conductivities. A shift in energy of the 4s -> 4p atomic line is explained by the rise of ionization with temperature. C1 CEA DAM Ole France, Dept Phys Theoret & Appl, F-91680 Bruyeres Le Chatel, France. Sandia Natl Labs, Pulsed Power Sci Ctr, Albuquerque, NM 87185 USA. RP Clerouin, J (reprint author), CEA DAM Ole France, Dept Phys Theoret & Appl, Boite Postal 12, F-91680 Bruyeres Le Chatel, France. EM jean.clerouin@cea.fr RI Clerouin, jean/D-8528-2015 OI Clerouin, jean/0000-0003-2144-2759 NR 24 TC 52 Z9 52 U1 2 U2 11 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064203 DI 10.1103/PhysRevB.71.064203 PG 5 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500028 ER PT J AU Cuenya, BR Keune, W Li, DQ Bader, SD AF Cuenya, BR Keune, W Li, DQ Bader, SD TI Enhanced hyperfine magnetic fields for face-centered tetragonal Fe(110) ultrathin films on vicinal Pd(110) SO PHYSICAL REVIEW B LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; FE FILMS; MOSSBAUER-SPECTROSCOPY; FCC FE; CIRCULAR-DICHROISM; FE/PD MULTILAYERS; SURFACE MAGNETISM; PALLADIUM-IRON; FE(001) FILMS; THIN-FILMS AB The structure and hyperfine magnetic proper-ties of epitaxial Fe ultrathin films on a vicinal Pd(110) surface have been investigated by means of low-energy electron diffraction (LEED), reflection high-energy electron diffraction (RHEED) and Fe-57 conversion electron Mossbauer spectroscopy (CEMS). LEED and RHEED provide evidence for initial pseudomorphic film growth. The RHEED determination of the in-plane atomic distance versus Fe film thickness demonstrates the stabilization of the metastable fcc-like Fe structure on Pd(110). This interpretation is supported by in situ Fe-57 CEMS measurements which indicate an enhanced saturation hyperfine field of similar to 39 T for a 3-monolayers-thick Fe film at 25 K. This is the highest value ever measured for Fe on a metallic substrate. Our results suggest that ultrathin fcc-like (face-centered tetragonal) Fe films on Pd(110) are in a ferromagnetic high-moment state with an enhanced hyperfine field due to electronic 3d-4d hybridization at the Fe/Pd interface. C1 Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA. Univ Duisburg Essen, Fachbereich Phys, D-47048 Duisburg, Germany. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA. EM roldan@physics.ucf.edu RI Bader, Samuel/A-2995-2013; Roldan Cuenya, Beatriz/L-1874-2016 OI Roldan Cuenya, Beatriz/0000-0002-8025-307X NR 81 TC 5 Z9 5 U1 1 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064409 DI 10.1103/PhysRevB.71.064409 PG 9 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500043 ER PT J AU Daniel, M Han, SW Booth, CH Cornelius, AL Pagliuso, PG Sarrao, JL Thompson, JD AF Daniel, M Han, SW Booth, CH Cornelius, AL Pagliuso, PG Sarrao, JL Thompson, JD TI X-ray absorption studies of the local structure and f-level occupancy in CeIr1-xRhxIn5 SO PHYSICAL REVIEW B LA English DT Article ID FERMI-LIQUID BEHAVIOR; UNCONVENTIONAL SUPERCONDUCTIVITY; GRIFFITHS PHASE; HEAVY; CERHIN5; TEMPERATURE; ELECTRON; CEIRIN5; DEPENDENCE; SYSTEMS AB The CeIr1-xRxIn5 series exhibits a range of interesting phenomena, including heavy-fermion superconductivity, non-Fermi liquid behavior, and concomitant antiferromagnetism and superconductivity. In the low-Rh concentration range (0.1 <= x <= 0.5), specific heat measurements show a broad anomaly, suggestive of gross phase separation. We have performed x-ray absorption experiments at the Ce L-III, Ir L-III, and Rh K-edges as a function of Rh concentration and temperature. X-ray absorption near-edge structure measurements indicate that cerium is close to trivalent in this system, with no measurable change with temperature from 20-300 K, consistent with a heavy-fermion material. Extended x-ray absorption fine structure measurements as a function of temperature from all measured edges indicate the local crystal structure of all samples is well ordered, with no gross phase separation observed, even for samples with x=0.125 and x=0.25. These results therefore suggest that the anomalous specific heat behavior in the 0.1 <= x <= 0.5 range have some other explanation, and some possibilities are discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA. Chonbuk Natl Univ, Jeonju 561756, South Korea. Los Alamos Natl Lab, Div Sci Mat, Los Alamos, NM 87501 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RI Booth, Corwin/A-7877-2008; Cornelius, Andrew/A-9837-2008; Pagliuso, Pascoal/C-9169-2012 NR 42 TC 9 Z9 9 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054417 DI 10.1103/PhysRevB.71.054417 PG 8 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400062 ER PT J AU dela Cruz, C Yen, F Lorenz, B Wang, YQ Sun, YY Gospodinov, MM Chu, CW AF dela Cruz, C Yen, F Lorenz, B Wang, YQ Sun, YY Gospodinov, MM Chu, CW TI Strong spin-lattice coupling in multiferroic HoMnO3: Thermal expansion anomalies and pressure effect SO PHYSICAL REVIEW B LA English DT Article ID HEXAGONAL MANGANITES; MAGNETIC-STRUCTURES; DIFFRACTION; RMNO3 AB Evidence for a strong spin-lattice coupling in multiferroic HoMnO3 is derived from thermal expansion measurements along the a and c axes. The magnetoelastic effect results in sizable anomalies of the thermal expansivities at the antiferromagnetic (T-N) and the spin rotation (T-SR) transition temperatures as well as in a negative c-axis expansivity below room temperature. The coupling between magnetic orders and dielectric properties below T-N is explained by the lattice strain induced by the magnetoelastic effect. At T-SR various physical quantities show discontinuities that are thermodynamically consistent with a first-order phase transition. C1 Univ Houston, Dept Phys, Houston, TX 77204 USA. Univ Houston, TCSUH, Houston, TX 77204 USA. Bulgarian Acad Sci, Inst Solid State Phys, BU-1784 Sofia, Bulgaria. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China. RP dela Cruz, C (reprint author), Univ Houston, Dept Phys, Houston, TX 77204 USA. RI dela Cruz, Clarina/C-2747-2013; Yen, Fei/C-8713-2015 OI dela Cruz, Clarina/0000-0003-4233-2145; Yen, Fei/0000-0003-2295-3040 NR 26 TC 77 Z9 77 U1 3 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 060407 DI 10.1103/PhysRevB.71.060407 PG 4 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500008 ER PT J AU Dordevic, SV Komiya, S Ando, Y Wang, YJ Basov, DN AF Dordevic, SV Komiya, S Ando, Y Wang, YJ Basov, DN TI Josephson vortex state across the phase diagram of La2-xSrxCuO4: A magneto-optics study SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CUPRATE SUPERCONDUCTORS; MAGNETIC-FIELD; MIXED-STATE; PLASMA; DYNAMICS; ELECTRONS; VORTICES; ZEEMAN; FILMS AB We present a detailed doping dependent study of the Josephson vortex state in La2-xSrxCuO4 using infrared spectroscopy. A magnetic field as high as 17 tesla, applied along the CuO2 planes, is found to suppress the Josephson plasmon in all measured samples. We find the strongest suppression in samples with dopings close to x=1/8 and attribute this effect to the spontaneous formation of in-plane charge inhomogenities at this doping level. Several theoretical models of the Josephson vortex state are applied to explain the observed effects. C1 Cent Res Inst Elect Power Ind, Tokyo 201, Japan. Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RP Dordevic, SV (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RI Ando, Yoichi/B-8163-2013 OI Ando, Yoichi/0000-0002-3553-3355 NR 49 TC 18 Z9 18 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054503 DI 10.1103/PhysRevB.71.054503 PG 9 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400068 ER PT J AU Goupalov, SV AF Goupalov, SV TI Continuum model for long-wavelength phonons in two-dimensional graphite and carbon nanotubes SO PHYSICAL REVIEW B LA English DT Article AB A continuum model yielding dispersion relations for long-wavelength acoustic and optical phonons in two-dimensional graphite and achiral single-walled carbon nanotubes is developed. Close relations with the theory of thin elastic plates and cylindrical shells are established. The effective thickness of a nanotube determining the limits of validity of the continuum model is estimated. A qualitative analysis of vibrations of chiral nanotubes is presented. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. RP Goupalov, SV (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 18 TC 49 Z9 49 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 8 AR 085420 DI 10.1103/PhysRevB.71.085420 PG 7 WC Physics, Condensed Matter SC Physics GA 912GJ UT WOS:000228065300082 ER PT J AU Haraldsen, JT Barnes, T Musfeldt, JL AF Haraldsen, JT Barnes, T Musfeldt, JL TI Neutron scattering and magnetic observables for S=1/2 spin clusters and molecular magnets SO PHYSICAL REVIEW B LA English DT Article ID EQUILATERAL TRIANGULAR LATTICE; EXCHANGE INTERACTIONS; QUANTUM COHERENCE; DIMER; LOCALIZATION; COPPER(II); DYNAMICS; COMPLEX; STATES AB In this paper we report results for magnetic observables of finite spin clusters composed of S = 1/2 ions. We consider clusters of two, three, and four spins in distinct spatial arrangements, with isotropic Heisenberg interactions of various strengths between ion pairs. In addition to the complete set of energy eigenvalues and eigenvectors, specific heat and magnetic susceptibility, we also quote results for the single crystal and powder average inelastic neutron scattering structure factors. Examples of the application of these results to experimental systems are also discussed. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. RP Haraldsen, JT (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RI Haraldsen, Jason/B-9809-2012 OI Haraldsen, Jason/0000-0002-8641-5412 NR 43 TC 38 Z9 38 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064403 DI 10.1103/PhysRevB.71.064403 PG 20 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500037 ER PT J AU Kim, JH Lee, Y Homes, CC Rhyee, JS Cho, BK Oh, SJ Choi, EJ AF Kim, JH Lee, Y Homes, CC Rhyee, JS Cho, BK Oh, SJ Choi, EJ TI Optical spectroscopy study of the electronic structure of Eu1-xCaxB6 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-PROPERTIES; PARASITIC FERROMAGNETISM; FERMI-SURFACE; EUB6; CAB6; CA1-XLA(X)B-6; HEXABORIDES; TRANSPORT; GAS AB The room temperature optical conductivity sigma(1)(omega) of Eu1-xCaxB6 has been obtained from reflectivity and ellipsometry measurements for a series of compositions, 0 <= x <= 1. The interband part of sigma(1)(omega) shifts continuously to higher frequency as Ca content x increases. Also the intraband spectral weight of sigma(1)(omega) decreases rapidly and essentially vanishes for x >= x(c)=0.35. These results show that the valence band and the conduction band of Eu1-xCaxB6 move away from each other such that their band overlap decreases with increasing Ca substitution. As a result, the electronic state evolves from the semimetallic structure of EuB6 to the insulating CaB6 where the two bands are separated to open a finite gap (similar or equal to 0.25 eV) at the X point of the Brillouin zone. C1 Seoul Natl Univ, Sch Phys, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea. Univ Seoul, Dept Phys, Seoul 130743, South Korea. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. K JIST, Ctr Frontier Mat, Kwangju 500712, South Korea. K JIST, Dept Mat Sci & Engn, Kwangju 500712, South Korea. RP Choi, EJ (reprint author), Seoul Natl Univ, Sch Phys, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea. NR 36 TC 9 Z9 9 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 7 AR 075105 DI 10.1103/PhysRevB.71.075105 PG 4 WC Physics, Condensed Matter SC Physics GA 911OJ UT WOS:000228013600029 ER PT J AU Kopnin, NB Mel'nikov, AS Vinokur, VM AF Kopnin, NB Mel'nikov, AS Vinokur, VM TI Loss of Andreev backscattering in superconducting quantum point contacts SO PHYSICAL REVIEW B LA English DT Article ID JOSEPHSON CURRENT; MAGNETIC FIELD; REFLECTION; JUNCTIONS; CHANNEL; QUANTIZATION; ENERGY AB We study effects of magnetic field on the quasiparticle energy spectrum in a superconducting quantum point contact. The supercurrent induced by the magnetic field leads to intermode transitions between the electron waves that pass and do not pass through the constriction. The latter experience normal reflections which couple the states with opposite momenta inside the quantum channel and create a minigap in the low-energy spectrum that depends on the magnetic field. C1 Helsinki Univ Technol, Low Temp Lab, FIN-02015 Espoo, Finland. LD Landau Theoret Phys Inst, Moscow 117940, Russia. Russian Acad Sci, Inst Microstruct Phys, Nizhnii Novgorod 603950, Russia. Argonne Natl Lab, Argonne, IL 60439 USA. RP Kopnin, NB (reprint author), Helsinki Univ Technol, Low Temp Lab, POB 2200, FIN-02015 Espoo, Finland. RI Mel'nikov, Alexander/E-8099-2017 OI Mel'nikov, Alexander/0000-0002-4241-467X NR 25 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 052505 DI 10.1103/PhysRevB.71.052505 PG 4 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400021 ER PT J AU Li, SL Wilson, SD Mandrus, D Zhao, BR Onose, Y Tokura, Y Dai, PC AF Li, SL Wilson, SD Mandrus, D Zhao, BR Onose, Y Tokura, Y Dai, PC TI Spin-charge coupling in lightly doped Nd2-xCexCuO4 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-STRUCTURE; ANTIFERROMAGNETIC YBA2CU3O6+X; MAGNETORESISTANCE ANOMALIES; PR2CUO4; FIELD; TRANSITION; DYNAMICS; CRYSTAL; STRIPES; PR AB We use neutron scattering to study the influence of a magnetic field on spin structures of Nd2CuO4. On cooling from room temperature, Nd2CuO4 goes through a series of antiferromagnetic (AF) phase transitions with different noncollinear spin structures. While a c-axis aligned magnetic field does not alter the basic zero-field noncollinear spin structures, a field parallel to the CuO2 Plane can transform the noncollinear structure to a collinear one ("spin-flop" transition), induce magnetic disorder along the c axis, and cause hysteresis in the AF phase transitions. By comparing these results directly to the magnetoresistance (MR) measurements of Nd1.975Ce0.025CuO4, which has essentially the same AF structures as Nd2CuO4, we find that a magnetic-field-induced spin-flop transition, AF phase hysteresis, and spin c-axis disorder all affect the transport properties of the material. Our results thus provide direct evidence for the existence of a strong spin-charge coupling in electron-doped copper oxides. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China. Japan Sci & Technol, ERATO, Spin Superstruct Project, Tsukuba, Ibaraki 3058562, Japan. Correlated Electron Res Ctr, Tsukuba, Ibaraki 3058562, Japan. Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan. Oak Ridge Natl Lab, Ctr Neutron Scattering, Oak Ridge, TN 37831 USA. RP Li, SL (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. EM daip@ornl.gov RI Li, Shiliang/B-9379-2009; Onose, Yoshinori/F-1977-2010; Dai, Pengcheng /C-9171-2012; Tokura, Yoshinori/C-7352-2009; Mandrus, David/H-3090-2014 OI Dai, Pengcheng /0000-0002-6088-3170; NR 37 TC 14 Z9 15 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054505 DI 10.1103/PhysRevB.71.054505 PG 10 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400070 ER PT J AU Markos, P Soukoulis, CM AF Markos, P Soukoulis, CM TI Intensity distribution of scalar waves propagating in random media SO PHYSICAL REVIEW B LA English DT Article ID UNIVERSAL CONDUCTANCE FLUCTUATIONS; RANDOM-MATRIX-THEORY; SCALING THEORY; PHOTON LOCALIZATION; MULTIPLE-SCATTERING; CLASSICAL WAVES; 2 DIMENSIONS; TRANSMISSION; DIFFUSION; ABSENCE AB Transmission of a scalar field through a random medium, represented by a system of randomly distributed dielectric cylinders, is calculated numerically. The system is mapped to the problem of electronic transport in disordered two-dimensional systems. Universality of the statistical distribution of transmission parameters is analyzed in the metallic and localized regimes. In the metallic regime, the universality of transmission statistics in all transparent channels is observed. In the band gaps, we distinguish a disorder induced (Anderson) localization from tunneling through the system, due to a gap in the density of states. We also show that absorption causes a rapid decrease of the mean conductance, but, contrary to the case of the localized regime, the conductance is self-averaged with a Gaussian distribution. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Slovak Acad Sci, Inst Phys, Bratislava 84511, Slovakia. FORTH, Res Ctr Crete, Iraklion 71110, Crete, Greece. RP Markos, P (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. EM peter.markos@savba.sk RI Soukoulis, Costas/A-5295-2008 NR 30 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054201 DI 10.1103/PhysRevB.71.054201 PG 7 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400037 ER PT J AU McCarty, KF Nobel, JA Bartelt, NC AF McCarty, KF Nobel, JA Bartelt, NC TI Surface dynamics dominated by bulk thermal defects: The case of NiAl(110) SO PHYSICAL REVIEW B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; ENERGY-ELECTRON MICROSCOPY; SELF-DIFFUSION; POINT-DEFECTS; INTERMETALLIC COMPOUNDS; ATOMISTIC SIMULATION; CRYSTALLINE SURFACE; TIO2(110) SURFACE; METAL-SURFACES; DECAY AB We find that small temperature changes cause steps on the NiAl(110) surface to move. We show that this step motion occurs because mass is transferred between the bulk and the surface as the concentration of bulk thermal defects (i.e., vacancies) changes with temperature. Since the change in an island's area with a temperature change is found to scale strictly with the island's step length, the thermally generated defects are created (annihilated) very near the surface steps. To quantify the bulk/surface exchange, we oscillate the sample temperature and measure the amplitude and phase lag of the system response, i.e., the change in an island's area normalized to its perimeter. Using a one-dimensional model of defect diffusion through the bulk in a direction perpendicular to the surface, we determine the migration and formation energies of the bulk thermal defects. During surface smoothing, we show that there is no flow of material between islands on the same terrace and that all islands in a stack shrink at the same rate. We conclude that smoothing occurs by mass transport through the bulk of the crystal rather than via surface diffusion. Based on the measured relative sizes of the activation energies for island decay, defect migration, and defect formation, we show that attachment/ detachment at the steps is the rate-limiting step in smoothing. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP McCarty, KF (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. RI McCarty, Kevin/F-9368-2012; Bartelt, Norman/G-2927-2012 OI McCarty, Kevin/0000-0002-8601-079X; NR 78 TC 9 Z9 9 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 8 AR 085421 DI 10.1103/PhysRevB.71.085421 PG 12 WC Physics, Condensed Matter SC Physics GA 912GJ UT WOS:000228065300083 ER PT J AU Moussa, R Foteinopoulou, S Zhang, L Tuttle, G Guven, K Ozbay, E Soukoulis, CM AF Moussa, R Foteinopoulou, S Zhang, L Tuttle, G Guven, K Ozbay, E Soukoulis, CM TI Negative refraction and superlens behavior in a two-dimensional photonic crystal SO PHYSICAL REVIEW B LA English DT Article ID BOUNDARY AB We experimentally and theoretically studied a left-handed structure based on a photonic crystal (PC) with a negative refractive index. The structure consists of triangular array of rectangular dielectric bars with dielectric constant 9.61. Experimental and theoretical results demonstrate the negative refraction and the superlensing phenomena in the microwave regime. The results show high transmission for our structure for a wide range of incident angles. Furthermore, surface termination within a specific cut of the structure excite surface waves at the interface between air and PC and allow the reconstruction of evanescent waves for a better focus and better transmission. The normalized average field intensity calculated in both the source and image planes shows almost the same full width at half maximum for the source and the focused beam. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA. Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA. Bilkent Univ, Dept Phys, TR-06533 Bilkent, Turkey. RP US DOE, Ames Lab, Ames, IA 50011 USA. RI Soukoulis, Costas/A-5295-2008; Ozbay, Ekmel/B-9495-2008 NR 19 TC 130 Z9 135 U1 7 U2 20 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 8 AR 085106 DI 10.1103/PhysRevB.71.085106 PG 5 WC Physics, Condensed Matter SC Physics GA 912GJ UT WOS:000228065300022 ER PT J AU Parish, MM Mihaila, B Timmermans, EM Blagoev, KB Littlewood, PB AF Parish, MM Mihaila, B Timmermans, EM Blagoev, KB Littlewood, PB TI BCS-BEC crossover with a finite-range interaction SO PHYSICAL REVIEW B LA English DT Article ID BOSE-EINSTEIN CONDENSATION; GROUND-STATE; FERMI GAS; MOLECULES; ENERGY AB We study the crossover from BEC to BCS pairing for dilute systems but with a realistic finite-range interaction. We exhibit the changes in the excitation spectrum that provide a clean qualitative distinction between the two limits. We also study how the dilute system converges to the results from a zero-range pseudopotential derived by Leggett. C1 Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. RP Parish, MM (reprint author), Univ Cambridge, Cavendish Lab, Madingley Rd, Cambridge CB3 0HE, England. RI Cavendish, TCM/C-9489-2009; Littlewood, Peter/B-7746-2008; Mihaila, Bogdan/D-8795-2013; Parish, Meera/E-5102-2013 OI Mihaila, Bogdan/0000-0002-1489-8814; NR 41 TC 30 Z9 30 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064513 DI 10.1103/PhysRevB.71.064513 PG 6 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500070 ER PT J AU Park, T Malinowski, A Hundley, MF Thompson, JD Sun, Y Salamon, AB Choi, EM Kim, HJ Lee, SI Canfield, PC Kogan, VG AF Park, T Malinowski, A Hundley, MF Thompson, JD Sun, Y Salamon, AB Choi, EM Kim, HJ Lee, SI Canfield, PC Kogan, VG TI Anomalous paramagnetic effects in the mixed state of LuNi2B2C SO PHYSICAL REVIEW B LA English DT Article ID FLUX-LINE-LATTICE; VORTEX-LATTICE; SINGLE-CRYSTAL; MELTING TRANSITION; PHASE-TRANSITION; SUPERCONDUCTORS; TEMPERATURE; YBA2CU3O7-DELTA; YNI2B2C; MAGNETISM AB Anomalous paramagnetic effects in dc magnetization were observed in the mixed state of LuNi2B2C, unlike any reported previously. It appears as a kink-like feature for H >= 30 kOe and becomes more prominent with increasing field. A specific heat anomaly at the corresponding temperature suggests that the magnetization anomaly is due to a true bulk transition. A magnetic flux transition from a square to an hexagonal lattice is consistent with the anomaly. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Illinois, Dept Phys & Mat Res Lab, Urbana, IL 61801 USA. Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconductiv, Pohang 790784, South Korea. Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea. Iowa State Univ, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA. RP Park, T (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Park, Tuson/A-1520-2012; Canfield, Paul/H-2698-2014; Malinowski, Artur/A-2184-2015; Sun, Young/A-7772-2013 OI Malinowski, Artur/0000-0003-3771-9353; Sun, Young/0000-0001-8879-3508 NR 32 TC 8 Z9 8 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054511 DI 10.1103/PhysRevB.71.054511 PG 5 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400076 ER PT J AU Seppala, ET Belak, J Rudd, RE AF Seppala, ET Belak, J Rudd, RE TI Three-dimensional molecular dynamics simulations of void coalescence during dynamic fracture of ductile metals SO PHYSICAL REVIEW B LA English DT Article ID POROUS PLASTIC SOLIDS; HIGH STRAIN-RATE; ATOMISTIC SIMULATION; GROWTH; FAILURE; MODEL; NUCLEATION; CRYSTALS; CRITERIA; LINKING AB Void coalescence and interaction in dynamic fracture of ductile metals have been investigated using three-dimensional strain-controlled multimillion atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical intervoid ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain rate of the expansion of the system. The interaction of the voids. is not reflected in the volumetric asymptotic growth rate of the voids, as demonstrated here. Finally, the practice of using a single void and periodic boundary conditions to study coalescence is examined critically and shown to produce results markedly different than the coalescence of a pair of isolated voids. C1 Lawrence Livermore Natl Lab, Condensed Matter Phys Div, Livermore, CA 94551 USA. RP Rudd, RE (reprint author), Lawrence Livermore Natl Lab, Condensed Matter Phys Div, L-045, Livermore, CA 94551 USA. EM eira@iki.fi; belak@llnl.gov; robert.rudd@llnl.gov NR 53 TC 55 Z9 59 U1 3 U2 23 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064112 DI 10.1103/PhysRevB.71.064112 PG 10 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500025 ER PT J AU Sidorov, VA Ekimov, EA Stishov, SM Bauer, ED Thompson, JD AF Sidorov, VA Ekimov, EA Stishov, SM Bauer, ED Thompson, JD TI Superconducting and normal-state properties of heavily hole-doped diamond SO PHYSICAL REVIEW B LA English DT Article ID CARRIER-CONCENTRATION; NATURAL DIAMOND; DEPENDENCE; FILMS; TEMPERATURE; SEMICONDUCTORS AB We report measurements of the specific heat, Hall effect,.upper critical field, and resistivity on bulk, B-doped diamond prepared by reacting amorphous B and graphite under high-pressure, high-temperature conditions. These experiments establish unambiguous evidence for bulk superconductivity and provide a consistent set of materials parameters that favor a conventional, weak coupling electron-phonon interpretation of the superconducting mechanism at high hole doping. C1 Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Sidorov, VA (reprint author), Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia. RI Bauer, Eric/D-7212-2011 NR 32 TC 62 Z9 62 U1 0 U2 14 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 060502 DI 10.1103/PhysRevB.71.060502 PG 4 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500011 ER PT J AU Smirnov, AV Shelton, WA Johnson, DD AF Smirnov, AV Shelton, WA Johnson, DD TI Importance of thermal disorder on the properties of alloys: Origin of paramagnetism and structural anomalies in bcc-based Fe1-xAlx SO PHYSICAL REVIEW B LA English DT Article ID FE-AL ALLOYS; RANDOM SUBSTITUTIONAL ALLOYS; TRANSITION-METAL ALUMINIDES; ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; TOTAL-ENERGY; IRON; TEMPERATURE; SPIN; HARDNESS AB Fe1-xAlx exhibits interesting magnetic and anomalous structural properties as a function of composition and sample processing conditions arising from thermal or off-stoichiometric chemical disorder, and, although well studied, these properties are not understood. In stoichiometric B2 FeAl, including the effects of partial long-range order, i.e., thermal antisites, we find the experimentally observed paramagnetic response with nonzero local moments, in contrast to past investigations that find either a ferromagnetic or nonmagnetic state, both inconsistent with experiment. Moreover, from this magnetochemical coupling, we are able to determine the origins of the observed lattice constant anomalies found in Fe1-xAlx for x similar or equal to 0.25-0.5 under various processing conditions. C1 Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA. RP Smirnov, AV (reprint author), Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. OI Johnson, Duane/0000-0003-0794-7283 NR 49 TC 29 Z9 29 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064408 DI 10.1103/PhysRevB.71.064408 PG 6 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500042 ER PT J AU Staub, U Shi, M Schulze-Briese, C Patterson, BD Fauth, F Dooryhee, E Soderholm, L Cross, JO Mannix, D Ochiai, A AF Staub, U Shi, M Schulze-Briese, C Patterson, BD Fauth, F Dooryhee, E Soderholm, L Cross, JO Mannix, D Ochiai, A TI Temperature dependence of the crystal structure and charge ordering in Yb4As3 SO PHYSICAL REVIEW B LA English DT Article ID S=1/2 ANTIFERROMAGNET YB4AS3; METAL-INSULATOR-TRANSITION; LOW-ENERGY EXCITATIONS; X-RAY-ABSORPTION; ELECTRONIC-STRUCTURE; HEAVY-FERMION; SYSTEM YB4AS3; SCATTERING; DIFFRACTION; VALENCE AB Resonant and nonresonant x-ray scattering, combined with x-ray absorption data, are presented on Yb4As3. The nonresonant data allow a detailed determination of the low-temperature crystal structure and its evolution as a function of temperature. Bond-valence-sum calculations are performed and compared with theoretical predictions. Using the structural knowledge, the energy dependence, near the Yb L-3 edge, of particular x-ray reflections are calculated and compared with experiment, and the temperature dependence of the charge order is extracted. A united picture of the temperature-dependent crystal structure and charge ordering in Yb4As3 emerges and is compared with theory. C1 Paul Scherrer Inst, CH-5232 Villigen, Switzerland. European Synchrotron Radiat Facil, F-38043 Grenoble, France. CNRS, Cristallog Lab, F-38042 Grenoble, France. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Adv Photon Source, PNC CAT, Argonne, IL 60439 USA. European Synchrotron Radiat Facil, F-38043 Grenoble, France. Tohoku Univ, Ctr Low Temp Sci, Sendai, Miyagi 9808578, Japan. RP Staub, U (reprint author), Paul Scherrer Inst, CH-5232 Villigen, Switzerland. RI dooryhee, eric/D-6815-2013; Staub, Urs/C-4914-2015; Fauth, Francois/K-9643-2014 OI Fauth, Francois/0000-0001-9465-3106 NR 54 TC 14 Z9 14 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 7 AR 075115 DI 10.1103/PhysRevB.71.075115 PG 11 WC Physics, Condensed Matter SC Physics GA 911OJ UT WOS:000228013600039 ER PT J AU Wang, Y Liu, ZK Chen, LQ Burakovsky, L Preston, DL Luo, W Johansson, B Ahuja, R AF Wang, Y Liu, ZK Chen, LQ Burakovsky, L Preston, DL Luo, W Johansson, B Ahuja, R TI Mean-field potential calculations of shock-compressed porous carbon SO PHYSICAL REVIEW B LA English DT Article ID EQUATION-OF-STATE; THERMODYNAMIC PROPERTIES; LIQUID DEUTERIUM; MBAR; GPA; TPA; MO; CU; PRESSURES; HUGONIOT AB The mean-field potential approach with first-principles total energy data as input is used to investigate shock-compressed carbon with initial densities of 3.51, 2.2, 1.85, and 1.6 g/cm(3) up to 1400 GPa. We have calculated the shock Hugoniot, and the temperature and electronic contribution to the heat capacity along the Hugoniot. While excellent agreement with underground nuclear explosion data is obtained, our results do not show the high compressibility of carbon at megabar pressures indicated by recent laser-driven shock wave experiments. C1 Penn State Univ, State Coll, PA 16802 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Uppsala, Dept Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden. Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden. RP Wang, Y (reprint author), Penn State Univ, State Coll, PA 16802 USA. EM yuw3@psu.edu RI Wang, Yi/D-1032-2013; Chen, LongQing/I-7536-2012; Liu, Zi-Kui/A-8196-2009 OI Chen, LongQing/0000-0003-3359-3781; Liu, Zi-Kui/0000-0003-3346-3696 NR 41 TC 9 Z9 9 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 054110 DI 10.1103/PhysRevB.71.054110 PG 6 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400034 ER PT J AU Zheng, XG Kawae, T Kashitani, Y Li, CS Tateiwa, N Takeda, K Yamada, H Xu, CN Ren, Y AF Zheng, XG Kawae, T Kashitani, Y Li, CS Tateiwa, N Takeda, K Yamada, H Xu, CN Ren, Y TI Unconventional magnetic transitions in the mineral clinoatacamite Cu2Cl(OH)(3) SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM HEISENBERG ANTIFERROMAGNETS; DZYALOSHINSKII-MORIYA INTERACTION; CANTED ANTIFERROMAGNETISM; CRYSTAL-STRUCTURE; BOTALLACKITE; GLASSINESS AB Unconventional magnetic properties are found for a quantum spin system of mineral clinoatacamite, Cu2Cl(OH)(3). Clinoatacamite is found to undergo an antiferromagnetic transition at 18.1 K with a small entropy fall (0.05R In 2). At temperatures below 6.4 K, it transits into a disordered spin-glass-like state but with large specific heat anomalies. The entire entropy fall for the spin system is about 0.31R In 2, which is smaller than those for dipolar spin ice (0.67R ln 2) and for ice I-h (0.71R ln 2). Geometric frustration for the quantum Cu2+ spins is suggested based on its crystal structure, magnetization, and specific heat studies. C1 Saga Univ, Dept Phys, Saga 8408502, Japan. Kyushu Univ, Fac Engn, Fukuoka 8128581, Japan. Natl Inst Adv Ind Sci & Technol, Saga 8410052, Japan. Argonne Natl Lab, Argonne, IL 60439 USA. RP Zheng, XG (reprint author), Saga Univ, Dept Phys, Saga 8408502, Japan. EM zheng@cc.saga-u.ac.jp RI Tateiwa, Naoyuki/P-6725-2014; U-ID, Kyushu/C-5291-2016 NR 12 TC 65 Z9 66 U1 1 U2 16 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 5 AR 052409 DI 10.1103/PhysRevB.71.052409 PG 4 WC Physics, Condensed Matter SC Physics GA 911OH UT WOS:000228013400014 ER PT J AU Zipse, D Dalal, NS Vasic, R Brooks, JS Kogerler, P AF Zipse, D Dalal, NS Vasic, R Brooks, JS Kogerler, P TI Dielectric and transport properties of K-6[V15As6O42(H2O)center dot 8H(2)O SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-PARAMAGNETIC-RESONANCE; CRYSTAL-STRUCTURE; MOLECULAR CLUSTERS; MN-12 ACETATE; IRON CLUSTER; MAGNETIZATION; NANOMAGNET; MN-12-ACETATE; EXCITATIONS; RELAXATION AB The dielectric, transport, and vibrational properties of the polyoxovanadate cluster K-6[V15As6O42(H2O)] center dot 8H(2)O, V-15, have been investigated by ac impedance and Raman scattering techniques. Over a temperature range of 77-300 K, V15 shows an essentially temperature-independent dielectric constant of 6 1, and two independent relaxation mechanisms with activation energies of 0.22 and 0.85 eV, respectively. While the origin of 0.85 eV mode remains unclear, Raman scattering experiments show a series of intramolecular vibrations between 85 and 1000 cm(-1) that we believe contribute to the 0.22 eV mode, as its preexponential factor nu(0) is similar to 10(13) Hz (167 cm(-1)). Resistivity data also reveal that V-15 exhibits thermally activated, semiconductorlike behavior over the 285-325 K temperature range. The activation energy, E-a, of V-15 was 0.2 eV, in reasonable agreement with earlier optical measurements of the band gap similar to 0.5 eV, assuming E-g=2E(a). C1 Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA. Florida State Univ, Natl High Magnet Field, Tallahassee, FL 32306 USA. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Zipse, D (reprint author), Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA. RI Kogerler, Paul/H-5866-2013 OI Kogerler, Paul/0000-0001-7831-3953 NR 48 TC 11 Z9 11 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB PY 2005 VL 71 IS 6 AR 064417 DI 10.1103/PhysRevB.71.064417 PG 8 WC Physics, Condensed Matter SC Physics GA 911OI UT WOS:000228013500051 ER PT J AU Ahmad, I Banar, JC Becker, JA Bredeweg, TA Cooper, JR Gemmell, DS Kraemer, A Mashayekhi, A McNabb, DP Miller, GG Moore, EF Palmer, P Pangault, LN Rundberg, RS Schiffer, JP Shastri, SD Wang, TF Wilhelmy, JB AF Ahmad, I Banar, JC Becker, JA Bredeweg, TA Cooper, JR Gemmell, DS Kraemer, A Mashayekhi, A McNabb, DP Miller, GG Moore, EF Palmer, P Pangault, LN Rundberg, RS Schiffer, JP Shastri, SD Wang, TF Wilhelmy, JB TI Search for x-ray induced decay of the 31-yr isomer of Hf-178 using synchrotron radiation SO PHYSICAL REVIEW C LA English DT Article ID ACCELERATED EMISSION; GAMMA-EMISSION; ROTATIONAL BAND; IRRADIATION; EXCITATION; SCATTERING AB Isomeric Hf-178 (t(1/2)=31 yr, E-x=2.446 MeV, J(pi)=16(+)) was bombarded by a white beam of x rays from the Advanced Photon Source at Argonne National Laboratory. A search was made for x-ray induced decay of the isomer by detecting prompt and delayed gamma rays associated with the decay. No induced decay was observed. Upper limits for such a process for x-ray energies between 7 and 100 keV were set. The limits between 7 and 30 keV are below approximate to3x10(-27) cm(2) keV for induced decay that bypasses the 4-s isomer and approximate to5x10(-27) cm(2) keV for induced decay that is delayed through this isomer, which are orders of magnitude below values at which induced decay was reported previously. These limits are consistent with what is known about the properties of atomic nuclei. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Ahmad, I (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 44 TC 20 Z9 22 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD FEB PY 2005 VL 71 IS 2 AR 024311 DI 10.1103/PhysRevC.71.024311 PG 16 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300022 ER PT J AU Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Veres, GI Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J AF Back, BB Baker, MD Ballintijn, M Barton, DS Becker, B Betts, RR Bickley, AA Bindel, R Busza, W Carroll, A Decowski, MP Garcia, E Gburek, T George, N Gulbrandsen, K Gushue, S Halliwell, C Hamblen, J Harrington, AS Henderson, C Hofman, DJ Hollis, RS Holynski, R Holzman, B Iordanova, A Johnson, E Kane, JL Khan, N Kulinich, P Kuo, CM Lee, JW Lin, WT Manly, S Mignerey, AC Nouicer, R Olszewski, A Pak, R Park, IC Pernegger, H Reed, C Roland, C Roland, G Sagerer, J Sarin, P Sedykh, I Skulski, W Smith, CE Steinberg, P Stephans, GSF Sukhanov, A Tonjes, MB Trzupek, A Vale, C van Nieuwenhuizen, GJ Verdier, R Veres, GI Wolfs, FLH Wosiek, B Wozniak, K Wyslouch, B Zhang, J CA PHOBOS Collaboration TI Charged antiparticle to particle ratios near midrapidity in p+p collisions at root s(NN)=200 GeV SO PHYSICAL REVIEW C LA English DT Article ID AU+AU COLLISIONS; PROTONS AB The ratios of the yields of primary charged antiparticles to particles have been obtained for pions, kaons, and protons near midrapidity for p+p collisions at s(NN)=200 GeV. Ratios of =1.000+/-0.012 (stat.) +/- 0.019 (syst.), =0.93+/-0.05 (stat.) +/- 0.03 (syst.), and <(p) over bar /p>=0.85+/-0.04 (stat.) +/- 0.03 (syst.) have been measured. The reported values represent the ratio of the yields averaged over the rapidity range of 0.1/v(T)=13.0+/-0.5 mb at kT=5.1 keV. C1 Forschungszentrum Karlsruhe, Inst Kernphys, D-76021 Karlsruhe, Germany. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RP Heil, M (reprint author), Forschungszentrum Karlsruhe, Inst Kernphys, Postfach 3640, D-76021 Karlsruhe, Germany. EM Michael.Heil@ik.fzk.de RI Dababneh, Saed/E-7281-2017 OI Dababneh, Saed/0000-0002-7376-1084 NR 17 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD FEB PY 2005 VL 71 IS 2 AR 025803 DI 10.1103/PhysRevC.71.025803 PG 6 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300048 ER PT J AU Johnson, MS Cizewski, JA Smith, MB Thomas, JS Becker, JA Bernstein, LA Schiller, A McNabb, DP Fallon, P Macchiavelli, AO AF Johnson, MS Cizewski, JA Smith, MB Thomas, JS Becker, JA Bernstein, LA Schiller, A McNabb, DP Fallon, P Macchiavelli, AO TI Population of superdeformed excitations in Po-198 SO PHYSICAL REVIEW C LA English DT Article ID BAND; STATES; DECAY; MECHANISM; ENERGIES; NUCLEI; PB-192; MODEL; LINE AB Superdeformed excitations in Po-198 were studied using the Yb-174(Si-29,5n) reaction and gamma-ray spectroscopy with Gammasphere. Energy-spin entry distributions for populating normal (ND) and superdeformed (SD) excitations were extracted by gating on discrete ND and SD transitions, respectively. Information on the SD excitation energy, SD well depth, and fission barrier in Po-198 was deduced. C1 Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Johnson, MS (reprint author), Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. NR 26 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD FEB PY 2005 VL 71 IS 2 AR 024317 DI 10.1103/PhysRevC.71.024317 PG 5 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300028 ER PT J AU Pandharipande, VR Paris, MW Sick, I AF Pandharipande, VR Paris, MW Sick, I TI Virtual photon asymmetry for confined, interacting Dirac particles with spin symmetry SO PHYSICAL REVIEW C LA English DT Article ID NUCLEON STRUCTURE FUNCTIONS; RELATIVISTIC SYMMETRY; PRECISION-MEASUREMENT; PARTON DISTRIBUTIONS; BAG THEORY; MODEL; SCATTERING; QUARKS; PROTON AB We study the Bjorken x dependence of the virtual photon spin asymmetry in polarized deep inelastic scattering of electrons from hadrons. We use an exactly solved relativistic potential model of the hadron, treating the constituents as independent massless Dirac particles bound to an infinitely massive force center. The potential is chosen to have spin symmetry and a linear radial dependence with spherical symmetry. The effect of interactions of the struck constituent with the remainder of the target on the longitudinal photon asymmetry is demonstrated. In particular, the small-x suppression of the photon asymmetry observed in polarized deep inelastic scattering from the proton is shown to be a consequence of these interactions. The effect of p-wave components of the Dirac wave function, long known to give an important contribution to the spin of hadrons, is explicitly demonstrated through their interference with the s-wave term. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Univ Basel, Dept Phys & Astron, CH-4003 Basel, Switzerland. RP Pandharipande, VR (reprint author), Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA. EM vrp@uiuc.edu; mparis@jlab.org; Ingo.Sick@unibas.ch NR 28 TC 6 Z9 6 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 FEB PY 2005 VL 71 IS 2 AR 022201 DI 10.1103/PhysRevC.71.022201 PG 5 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300004 ER PT J AU Reddy, S Rupak, G AF Reddy, S Rupak, G TI Phase structure of two-flavor quark matter: Heterogeneous superconductors SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-STAR MATTER; HIGH-DENSITY; COLOR SUPERCONDUCTIVITY; QCD; TRANSITIONS; DROPLETS; CHARGE AB We analyze the free energy of charge- and color-neutral two-flavor quark matter within the BCS approximation. We consider both the homogeneous gapless superconducting phase and the heterogeneous mixed phase where normal and BCS superconducting phases coexist. We calculate the surface tension between normal and superconducting phases and use it to compare the free energies of the gapless and mixed phases. Our calculation, which retains only the leading-order gradient contribution to the free energy and ignores finite size effects such as Debye screening, indicates that the mixed phase is energetically favored over an interesting range of densities of relevance to two-flavor quark matter in neutron stars. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Reddy, S (reprint author), Los Alamos Natl Lab, Div Theoret, POB 1663, Los Alamos, NM 87545 USA. NR 43 TC 50 Z9 50 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD FEB PY 2005 VL 71 IS 2 AR 025201 DI 10.1103/PhysRevC.71.025201 PG 10 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300042 ER PT J AU Thomas, JS Bardayan, DW Blackmon, JC Cizewski, JA Greife, U Gross, CJ Johnson, MS Jones, KL Kozub, RL Liang, JF Livesay, RJ Ma, Z Moazen, BH Nesaraja, CD Shapira, D Smith, MS AF Thomas, JS Bardayan, DW Blackmon, JC Cizewski, JA Greife, U Gross, CJ Johnson, MS Jones, KL Kozub, RL Liang, JF Livesay, RJ Ma, Z Moazen, BH Nesaraja, CD Shapira, D Smith, MS TI First study of the level structure of the r-process nucleus Ge-83 SO PHYSICAL REVIEW C LA English DT Article ID HRIBF; DECAY AB The first (d,p) neutron transfer reaction on a neutron-rich r-process nucleus has been measured at the Holifield Radioactive Ion Beam Facility. The H-2(Ge-82,p)Ge-83 reaction was studied by bombarding a 430-mug/cm(2) (CD2)(n) target with a 330-MeV beam of radioactive Ge-82. The reaction Q value (Q=1.47+/-0.02 stat. +/-0.07 sys. MeV) has been measured leading to the first determination of the mass of the N=51 nucleus Ge-83. Excitation energies, angular distributions, and spectroscopic factors for the first two states of Ge-83 have also been determined. C1 Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA. Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. RP Thomas, JS (reprint author), Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. RI Jones, Katherine/B-8487-2011; OI Jones, Katherine/0000-0001-7335-1379; Nesaraja, Caroline/0000-0001-5571-8341 NR 23 TC 55 Z9 55 U1 0 U2 6 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 FEB PY 2005 VL 71 IS 2 AR 021302 DI 10.1103/PhysRevC.71.021302 PG 4 WC Physics, Nuclear SC Physics GA 901YX UT WOS:000227319300002 ER PT J AU Abazajian, K Switzer, ER Dodelson, S Heitmann, K Habib, S AF Abazajian, K Switzer, ER Dodelson, S Heitmann, K Habib, S TI Nonlinear cosmological matter power spectrum with massive neutrinos: The halo model SO PHYSICAL REVIEW D LA English DT Article ID LARGE-SCALE STRUCTURE; GALAXY; PARAMETERS; OSCILLATIONS; CONSTRAINTS; EVOLUTION; UNIVERSE; BIAS AB Measurements of the linear power spectrum of galaxies have placed tight constraints on neutrino masses. We extend the framework of the halo model of cosmological nonlinear matter clustering to include the effect of massive neutrino infall into cold dark matter (CDM) halos. The magnitude of the effect of neutrino clustering for three degenerate mass neutrinos with m(nui)=0.9 eV is of order similar to1%, within the potential sensitivity of upcoming weak lensing surveys. In order to use these measurements to further constrain-or eventually detect-neutrino masses, accurate theoretical predictions of the nonlinear power spectrum in the presence of massive neutrinos will be needed, likely only possible through high-resolution multiple particle (neutrino, CDM and baryon) simulations. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. NASA, Fermilab Astrophys Ctr, Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. Los Alamos Natl Lab, ISR Div, Los Alamos, NM 87545 USA. RP Abazajian, K (reprint author), Los Alamos Natl Lab, Div Theoret, MS B285, Los Alamos, NM 87545 USA. NR 40 TC 40 Z9 40 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 4 AR 043507 DI 10.1103/PhysRevD.71.043507 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800016 ER PT J AU Acosta, D Adelman, J Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Ben-Haim, E Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D Carron, S Carosi, R Cavalli-Sforza, M Castro, A Catastini, P Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Cho, I Cho, K Chokheli, D Chou, JP Chu, ML Chuang, S Chung, JY Chung, WH Chung, YS Ciobanu, CI Ciocci, MA Clark, AG Clark, D Coca, M Connolly, A Convery, M Conway, J Cooper, B Cordelli, M Cortiana, G Cranshaw, J Cuevas, J Culbertson, R Currat, C Cyr, D Dagenhart, D Da Ronco, S D'Auria, S de Barbaro, P De Cecco, S De Lentdecker, G Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Doksus, P Dominguez, A Donati, S Donega, M Donini, J D'Onofrio, M Dorigo, T Drollinger, V Ebina, K Eddy, N Ely, R Erbacher, R Erdmann, M Errede, D Errede, S Eusebi, R Fang, HC Farrington, S Fedorko, I Fedorko, WT Feild, RG Feindt, M Fernandez, JP Ferretti, C Field, RD Flanagan, G Flaugher, B Flores-Castillo, LR Foland, A Forrester, S Foster, GW Franklin, M Freeman, JC Frisch, H Fujii, Y Furic, I Gajjar, A Gallas, A Galyardt, J Gallinaro, M Garfinkel, AF Gay, C Gerberich, H Gerdes, DW Gerchtein, E Giagu, S Giannetti, P Gibson, A Gibson, K Ginsburg, C Giolo, K Giordani, M Giunta, M Giurgiu, G Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, D Goldstein, J Gomez, G Gomez-Ceballos, G Goncharov, M Gonzalez, O Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Griffiths, M Grosso-Pilcher, C Grundler, U Guenther, M da Costa, JG Haber, C Hahn, K Hahn, SR Halkiadakis, E Hamilton, A Han, BY Handler, R Happacher, F Hara, K Hare, M Harr, RF Harris, RM Hartmann, F Hatakeyama, K Hauser, J Hays, C Hayward, H Heider, E Heinemann, B Heinrich, J Hennecke, M Herndon, M Hill, C Hirschbuehl, D Hocker, A Hoffman, KD Holloway, A Hou, S Houlden, MA Huffman, BT Huang, Y Hughes, RE Huston, J Ikado, K Incandela, J Introzzi, G Iori, M Ishizawa, Y Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jang, D Jarrell, J Jeans, D Jensen, H Jeon, EJ Jones, M Joo, KK Jun, S Junk, T Kamon, T Kang, J Unel, MK Karchin, PE Kartal, S Kato, Y Kemp, Y Kephart, R Kerzel, U Khotilovich, V Kilminster, B Kim, DH Kim, HS Kim, JE Kim, MJ Kim, MS Kim, SB Kim, SH Kim, TH Kim, YK King, BT Kirby, M Kirsch, L Klimenko, S Knuteson, B Ko, BR Kobayashi, H Koehn, P Kong, DJ Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kotelnikov, K Kotwal, AV Kovalev, A Kraus, J Kravchenko, I Kreymer, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lai, S Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G Lauhakangas, R Lazzizzera, I Le, Y Lecci, C LeCompte, T Lee, J Lee, J Lee, SW Lefevre, R Leonardo, N Leone, S Lewis, JD Li, K Lin, C Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Liu, Y Lockyer, NS Loginov, A Loreti, M Loverre, P Lu, RS Lucchesi, D Lujan, P Lukens, P Lungu, G Lyons, L Lys, J Lysak, R MacQueen, D Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Marginean, R Martin, M Martin, A Martin, V Martinez, M Maruyama, T Matsunaga, H Mattson, M Mazzanti, P McFarland, KS McGivern, D McIntyre, PM McNamara, P NcNulty, R Menzemer, S Menzione, A Merkel, P Mesropian, C Messina, A Miao, T Miladinovic, N Miller, L Miller, R Miller, JS Miquel, R Miscetti, S Mitselmakher, G Miyamoto, A Miyazaki, Y Moggi, N Mohr, B Moore, R Morello, M Mukherjee, A Mulhearn, M Muller, T Mumford, R Munar, A Murat, P Nachtman, J Nahn, S Nakamura, I Nakano, I Napier, A Napora, R Naumov, D Necula, V Niell, F Nielsen, J Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Nicollerat, AS Nigmanov, T Nodulman, L Norniella, O Oesterberg, K Ogawa, T Oh, SH Oh, YD Ohsugi, T Okusawa, T Oldeman, R Orava, R Orejudos, W Pagliarone, C Palencia, E Paoletti, R Papadimitriou, V Pashapour, S Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Plager, C Pompos, A Pondrom, L Pope, G Poukhov, O Prakoshyn, F Pratt, T Pronko, A Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Rappoccio, S Ratnikov, F Ray, H Reichold, A Reisert, B Rekovic, V Renton, P Rescigno, M Rimondi, F Rinnert, K Ristori, L Robertson, WJ Robson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Russ, J Rusu, V Ruiz, A Ryan, D Saarikko, H Sabik, S Safonov, A St Denis, R Sakumoto, WK Salamanna, G Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Sato, K Savard, P Savoy-Navarro, A Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scribano, A Scuri, F Sedov, A Seidel, S Seiya, Y Semeria, F Sexton-Kennedy, L Sfiligoi, I Shapiro, MD Shears, T Shepard, PF Sherman, D Shimojima, M Shochet, M Shon, Y Shreyber, I Sidoti, A Siegrist, J Siket, M Sill, A Sinervo, P Sisakyan, A Skiba, A Slaughter, AJ Sliwa, K Smirnov, D Smith, JR Snider, FD Snihur, R Soha, A Somalwar, SV Spalding, J Spezziga, M Spiegel, L Spinella, F Spiropulu, M Squillacioti, P Stadie, H Stelzer, B Stelzer-Chilton, O Strologas, J Stuart, D Sukhanov, A Sumorok, K Sun, H Suzuki, T Taffard, A Tafirout, R Takach, SF Takano, H Takashima, R Takeuchi, Y Takikawa, K Tanaka, M Tanaka, R Tanimoto, N Tapprogge, S Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tiwari, V Tkaczyk, S Toback, D Tollefson, K Tomura, T Tonelli, D Tonnesmann, M Torre, S Torretta, D Tourneur, S Trischuk, W Tseng, J Tsuchiya, R Tsuno, S Tsybychev, D Turini, N Turner, M Ukegawa, F Unverhau, T Uozumi, S Usynin, D Vacavant, L Vaiciulis, A Varganov, A Vataga, E Vejcik, S Velev, G Veszpremi, V Veramendi, G Vickey, T Vidal, R Vila, I Vilar, R Vollrath, I Volobouev, I von der Mey, M Wagner, P Wagner, RG Wagner, RL Wagner, W Wallny, R Walter, T Yamashita, T Yamamoto, K Wan, Z Wang, MJ Wang, SM Warburton, A Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wittich, P Wolbers, S Wolter, M Worcester, M Worm, S Wright, T Wu, X Wurthwein, F Wyatt, A Yagil, A Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoon, P Yorita, K Yoshida, T Yu, I Yu, S Yu, Z Yun, JC Zanello, L Zanetti, A Zaw, I Zetti, F Zhou, J Zsenei, A Zucchelli, S AF Acosta, D Adelman, J Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Ben-Haim, E Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D Carron, S Carosi, R Cavalli-Sforza, M Castro, A Catastini, P Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Cho, I Cho, K Chokheli, D Chou, JP Chu, ML Chuang, S Chung, JY Chung, WH Chung, YS Ciobanu, CI Ciocci, MA Clark, AG Clark, D Coca, M Connolly, A Convery, M Conway, J Cooper, B Cordelli, M Cortiana, G Cranshaw, J Cuevas, J Culbertson, R Currat, C Cyr, D Dagenhart, D Da Ronco, S D'Auria, S de Barbaro, P De Cecco, S De Lentdecker, G Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Doksus, P Dominguez, A Donati, S Donega, M Donini, J D'Onofrio, M Dorigo, T Drollinger, V Ebina, K Eddy, N Ely, R Erbacher, R Erdmann, M Errede, D Errede, S Eusebi, R Fang, HC Farrington, S Fedorko, I Fedorko, WT Feild, RG Feindt, M Fernandez, JP Ferretti, C Field, RD Flanagan, G Flaugher, B Flores-Castillo, LR Foland, A Forrester, S Foster, GW Franklin, M Freeman, JC Frisch, H Fujii, Y Furic, I Gajjar, A Gallas, A Galyardt, J Gallinaro, M Garfinkel, AF Gay, C Gerberich, H Gerdes, DW Gerchtein, E 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Menzione, A Merkel, P Mesropian, C Messina, A Miao, T Miladinovic, N Miller, L Miller, R Miller, JS Miquel, R Miscetti, S Mitselmakher, G Miyamoto, A Miyazaki, Y Moggi, N Mohr, B Moore, R Morello, M Mukherjee, A Mulhearn, M Muller, T Mumford, R Munar, A Murat, P Nachtman, J Nahn, S Nakamura, I Nakano, I Napier, A Napora, R Naumov, D Necula, V Niell, F Nielsen, J Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Nicollerat, AS Nigmanov, T Nodulman, L Norniella, O Oesterberg, K Ogawa, T Oh, SH Oh, YD Ohsugi, T Okusawa, T Oldeman, R Orava, R Orejudos, W Pagliarone, C Palencia, E Paoletti, R Papadimitriou, V Pashapour, S Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Plager, C Pompos, A Pondrom, L Pope, G Poukhov, O Prakoshyn, F Pratt, T Pronko, A Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Rappoccio, S Ratnikov, F Ray, H Reichold, A Reisert, B Rekovic, V Renton, P Rescigno, M Rimondi, F Rinnert, K 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CDF Collaboration TI Search for anomalous production of diphoton events with missing transverse energy at CDF and limits on gauge-mediated supersymmetry-breaking models SO PHYSICAL REVIEW D LA English DT Article ID E(+)E(-) COLLISIONS; P(P)OVER-BAR COLLISIONS; ROOT-S=189 GEV; TEV; NEUTRALINOS; CHARGINOS; MASS AB We present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb(-1) of p (p) over bar collisions at s=1.96 TeV we observe no candidate events, with an expected standard model background of 0.27+/-0.07(stat)+/-0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c(2), and lightest neutralino of mass less than 93 GeV/c(2) at 95% C.L. in a gauge-mediated supersymmetry-breaking model with a light gravitino. C1 Univ Florida, Gainesville, FL 32611 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Inst Nucl Res, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. Harvard Univ, Cambridge, MA 02138 USA. Univ Helsinki, Helsinki Inst Phys, Helsinki Grp, FIN-00044 Helsinki, Finland. Univ Helsinki, Dept Phys Sci, Div High Energy Phys, FIN-00044 Helsinki, Finland. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 305, Japan. Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Liverpool, Liverpool L69 7ZE, Merseyside, England. UCL, London WC1E 6BT, England. MIT, Cambridge, MA 02139 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Univ New Mexico, Albuquerque, NM 87131 USA. Northwestern Univ, Evanston, IL 60208 USA. Ohio State Univ, Columbus, OH 43210 USA. Okayama Univ, Okayama 7008530, Japan. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. Univ Padua, Ist Nazl Fis Nucl, Sez Padova Trento, 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. Univ Roma La Sapienza, Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy. Rutgers State Univ, Piscataway, NJ 08855 USA. 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 305, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Wayne State Univ, Detroit, MI 48201 USA. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Univ Florida, Gainesville, FL 32611 USA. RI Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Lysak, Roman/H-2995-2014; Gallas Torreira, Abraham Antonio/K-6508-2014; Scodellaro, Luca/K-9091-2014; Connolly, Amy/J-3958-2013; Cabrera Urban, Susana/H-1376-2015; Cavalli-Sforza, Matteo/H-7102-2015; ciocci, maria agnese /I-2153-2015; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015; Prokoshin, Fedor/E-2795-2012; Leonardo, Nuno/M-6940-2016; Annovi, Alberto/G-6028-2012; Chiarelli, Giorgio/E-8953-2012; Lancaster, Mark/C-1693-2008; Ruiz, Alberto/E-4473-2011; Robson, Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; Wolter, Marcin/A-7412-2012; St.Denis, Richard/C-8997-2012; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Amerio, Silvia/J-4605-2012; Punzi, Giovanni/J-4947-2012; messina, andrea/C-2753-2013; Ivanov, Andrew/A-7982-2013; OI Warburton, Andreas/0000-0002-2298-7315; Gallas Torreira, Abraham Antonio/0000-0002-2745-7954; Scodellaro, Luca/0000-0002-4974-8330; ciocci, maria agnese /0000-0003-0002-5462; Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133; Prokoshin, Fedor/0000-0001-6389-5399; Leonardo, Nuno/0000-0002-9746-4594; Lami, Stefano/0000-0001-9492-0147; Giordani, Mario/0000-0002-0792-6039; Casarsa, Massimo/0000-0002-1353-8964; Latino, Giuseppe/0000-0002-4098-3502; iori, maurizio/0000-0002-6349-0380; Lancaster, Mark/0000-0002-8872-7292; Nielsen, Jason/0000-0002-9175-4419; Jun, Soon Yung/0000-0003-3370-6109; Annovi, Alberto/0000-0002-4649-4398; Chiarelli, Giorgio/0000-0001-9851-4816; Ruiz, Alberto/0000-0002-3639-0368; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Ivanov, Andrew/0000-0002-9270-5643; Toback, David/0000-0003-3457-4144; Hays, Chris/0000-0003-2371-9723; Farrington, Sinead/0000-0001-5350-9271; Robson, Aidan/0000-0002-1659-8284; Gallinaro, Michele/0000-0003-1261-2277; Salamanna, Giuseppe/0000-0002-0861-0052; Paulini, Manfred/0000-0002-6714-5787; Torre, Stefano/0000-0002-7565-0118; Turini, Nicola/0000-0002-9395-5230; Miquel, Ramon/0000-0002-6610-4836; Goldstein, Joel/0000-0003-1591-6014 NR 32 TC 21 Z9 21 U1 1 U2 4 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 FEB PY 2005 VL 71 IS 3 AR 031104 DI 10.1103/PhysRevD.71.031104 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400004 ER PT J AU Acosta, D Adelman, J Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Ben-Haim, E Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Brau, B Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D Carron, S Carosi, R Cavalli-Sforza, M Castro, A Catastini, P Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Cho, I Cho, K Chokheli, D Chou, JP Chu, ML Chuang, S Chung, JY Chung, WH Chung, YS Ciobanu, CI Ciocci, MA Clark, AG Clark, D Coca, M Connolly, A Convery, M Conway, J Cooper, B Cordelli, M Cortiana, G Cranshaw, J Cuevas, J Culbertson, R Currat, C Cyr, D Dagenhart, D Da Ronco, S D'Auria, S de Barbaro, P De Cecco, S De Lentdecker, G Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Dorr, C Doksus, P Dominguez, A Donati, S Donega, M Donini, J D'Onofrio, M Dorigo, T Drollinger, V Ebina, K Eddy, N Ehlers, J Ely, R Erbacher, R Erdmann, M Errede, D Errede, S Eusebi, R Fang, HC Farrington, S Fedorko, I Fedorko, WT Feild, RG Feindt, M Fernandez, JP Ferretti, C Field, RD Flanagan, G Flaugher, B Flores-Castillo, LR Foland, A Forrester, S Foster, GW Franklin, M Freeman, JC Fujii, Y Furic, I Gajjar, A Gallas, A Galyardt, J Gallinaro, M Garcia-Sciveres, M Garfinkel, AF Gay, C Gerberich, H Gerdes, DW Gerchtein, E Giagu, S Giannetti, P Gibson, A Gibson, K Ginsburg, C Giolo, K Giordani, M Giunta, M Giurgiu, G Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, D Goldstein, J Gomez, G Gomez-Ceballos, G Goncharov, M Gonzalez, O Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Griffiths, M Grosso-Pilcher, C Grundler, U Guenther, M da Costa, JG Haber, C Hahn, K Hahn, SR Halkiadakis, E Hamilton, A Han, BY Handler, R Happacher, F Hara, K Hare, M Harr, RF Harris, RM Hartmann, F Hatakeyama, K Hauser, J Hays, C Hayward, H Heider, E Heinemann, B Heinrich, J Hennecke, M Herndon, M Hill, C Hirschbuehl, D Hocker, A Hoffman, KD Holloway, A Hou, S Houlden, MA Huffman, BT Huang, Y Hughes, RE Huston, J Ikado, K Incandela, J Introzzi, G Iori, M Ishizawa, Y Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jang, D Jarrell, J Jeans, D Jensen, H Jeon, EJ Jones, M Joo, KK Jun, SY Junk, T Kamon, T Kang, J Unel, MK Karchin, PE Kartal, S Kato, Y Kemp, Y Kephart, R Kerzel, U Khotilovich, V Kilminster, B Kim, DH Kim, HS Kim, JE Kim, MJ Kim, MS Kim, SB Kim, SH Kim, TH Kim, YK King, BT Kirby, M Kirsch, L Klimenko, S Knuteson, B Ko, BR Kobayashi, H Koehn, P Kong, DJ Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kotelnikov, K Kotwal, AV Kovalev, A Kraus, J Kravchenko, I Kreymer, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kwang, S Laasanen, AT Lai, S Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G Lauhakangas, R Lazzizzera, I Le, Y Lecci, C LeCompte, T Lee, J Lee, J Lee, SW Lefevre, R Leonardo, N Leone, S Levy, S Lewis, JD Li, K Lin, C Lin, CS Lindgren, M Liss, TM Lister, A Litvintsev, DO Liu, T Liu, Y Lockyer, NS Loginov, A Loreti, M Loverre, P Lu, RS Lucchesi, D Lujan, P Lukens, P Lungu, G Lyons, L Lys, J Lysak, R MacQueen, D Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Marginean, R Marino, C Martin, A Martin, M Martin, V Martinez, M Maruyama, T Matsunaga, H Mattson, M Mazzanti, P McFarland, KS McGivern, D McIntyre, PM McNamara, P NcNulty, R Mehta, A Menzemer, S Menzione, A Merkel, P Mesropian, C Messina, A Miao, T Miladinovic, N Miller, L Miller, R Miller, JS Miquel, R Miscetti, S Mitselmakher, G Miyamoto, A Miyazaki, Y Moggi, N Mohr, B Moore, R Morello, M Fernandez, PAM Mukherjee, A Mulhearn, M Muller, T Mumford, R Munar, A Murat, P Nachtman, J Nahn, S Nakamura, I Nakano, I Napier, A Napora, R Naumov, D Necula, V Niell, F Nielsen, J Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Nigmanov, T Nodulman, L Norniella, O Oesterberg, K Ogawa, T Oh, SH Oh, YD Ohsugi, T Okusawa, T Oldeman, R Orava, R Orejudos, W Pagliarone, C Palencia, E Paoletti, R Papadimitriou, V Pashapour, S Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Plager, C Pompos, A Pondrom, L Pope, G Portell, X Poukhov, O Prakoshyn, F 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Stuart, D Sukhanov, A Sumorok, K Sun, H Suzuki, T Taffard, A Tafirout, R Takach, SF Takano, H Takashima, R Takeuchi, Y Takikawa, K Tanaka, M Tanaka, R Tanimoto, N Tapprogge, S Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tiwari, V Tkaczyk, S Toback, D Tollefson, K Tomura, T Tonelli, D Tonnesmann, M Torre, S Torretta, D Tourneur, S Trischuk, W Tseng, J Tsuchiya, R Tsuno, S Tsybychev, D Turini, N Turner, M Ukegawa, F Unverhau, T Uozumi, S Usynin, D Vacavant, L Vaiciulis, A Varganov, A Vataga, E Vejcik, S Velev, G Veszpremi, V Veramendi, G Vickey, T Vidal, R Vila, I Vilar, R Vollrath, I Volobouev, I von der Mey, M Wagner, P Wagner, RG Wagner, RL Wagner, W Wallny, R Walter, T Yamashita, T Yamamoto, K Wan, Z Wang, MJ Wang, SM Warburton, A Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wittich, P Wolbers, S Wolfe, C Wolter, M Worcester, M Worm, S Wright, T Wu, X Wurthwein, F Wyatt, A Yagil, A Yang, C Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoon, P Yorita, K Yoshida, T Yu, I Yu, S Yu, Z Yun, JC Zanello, L Zanetti, A Zaw, I Zetti, F Zhou, J Zsenei, A Zucchelli, S AF Acosta, D Adelman, J Affolder, T Akimoto, T Albrow, MG Ambrose, D Amerio, S Amidei, D Anastassov, A Anikeev, K Annovi, A Antos, J Aoki, M Apollinari, G Arisawa, T Arguin, JF Artikov, A Ashmanskas, W Attal, A Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barker, GJ Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bellettini, G Bellinger, J Ben-Haim, E Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Booth, PSL Bortoletto, D Boudreau, J Bourov, S Brau, B Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Byrum, KL Cabrera, S Campanelli, M Campbell, M Canepa, A Casarsa, M Carlsmith, D 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Stuart, D Sukhanov, A Sumorok, K Sun, H Suzuki, T Taffard, A Tafirout, R Takach, SF Takano, H Takashima, R Takeuchi, Y Takikawa, K Tanaka, M Tanaka, R Tanimoto, N Tapprogge, S Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tiwari, V Tkaczyk, S Toback, D Tollefson, K Tomura, T Tonelli, D Tonnesmann, M Torre, S Torretta, D Tourneur, S Trischuk, W Tseng, J Tsuchiya, R Tsuno, S Tsybychev, D Turini, N Turner, M Ukegawa, F Unverhau, T Uozumi, S Usynin, D Vacavant, L Vaiciulis, A Varganov, A Vataga, E Vejcik, S Velev, G Veszpremi, V Veramendi, G Vickey, T Vidal, R Vila, I Vilar, R Vollrath, I Volobouev, I von der Mey, M Wagner, P Wagner, RG Wagner, RL Wagner, W Wallny, R Walter, T Yamashita, T Yamamoto, K Wan, Z Wang, MJ Wang, SM Warburton, A Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wittich, P Wolbers, S Wolfe, C Wolter, M Worcester, M Worm, S Wright, T Wu, X Wurthwein, F Wyatt, A Yagil, A Yang, C Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoon, P Yorita, K Yoshida, T Yu, I Yu, S Yu, Z Yun, JC Zanello, L Zanetti, A Zaw, I Zetti, F Zhou, J Zsenei, A Zucchelli, S CA CDF Collaboration TI Measurement of the J/psi meson and b-hadron production cross sections in p(p)over-bar collisions at root s=1960 GeV SO PHYSICAL REVIEW D LA English DT Article ID HEAVY QUARK PRODUCTION; ROOT S=1.8 TEV; ELASTIC-SCATTERING; LUMINOSITY MONITOR; DETECTOR AB We present a new measurement of the inclusive and differential production cross sections of J/psi mesons and b hadrons in proton-antiproton collisions at roots=1960 GeV. The data correspond to an integrated luminosity of 39.7 pb(-1) collected by the CDF run II detector. We find the integrated cross section for inclusive J/psi production for all transverse momenta from 0 to 20 GeV/c in the rapidity range |y|<0.6 to be 4.08+/-0.02(stat)(-0.33)(+0.36)(syst) mub. We separate the fraction of J/psi events from the decay of the long-lived b hadrons using the lifetime distribution in all events with p(T)(J/psi)>1.25 GeV/c. We find the total cross section for b hadrons, including both hadrons and antihadrons, decaying to J/psi with transverse momenta greater than 1.25 GeV/c in the rapidity range |y(J/psi)|<0.6 is 0.330+/-0.005(stat)(-0.033)(+0.036)(syst) mub. Using a Monte Carlo simulation of the decay kinematics of b hadrons to all final states containing a J/psi, we extract the first measurement of the total single b-hadron cross section down to zero transverse momentum at roots=1960 GeV. 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RI Prokoshin, Fedor/E-2795-2012; Canelli, Florencia/O-9693-2016; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Lysak, Roman/H-2995-2014; Gallas Torreira, Abraham Antonio/K-6508-2014; Scodellaro, Luca/K-9091-2014; Connolly, Amy/J-3958-2013; Lazzizzera, Ignazio/E-9678-2015; Cabrera Urban, Susana/H-1376-2015; Cavalli-Sforza, Matteo/H-7102-2015; ciocci, maria agnese /I-2153-2015; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Amerio, Silvia/J-4605-2012; Punzi, Giovanni/J-4947-2012; messina, andrea/C-2753-2013; Annovi, Alberto/G-6028-2012; Lancaster, Mark/C-1693-2008; Ruiz, Alberto/E-4473-2011; Robson, Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; Wolter, Marcin/A-7412-2012; St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Ivanov, Andrew/A-7982-2013 OI Prokoshin, Fedor/0000-0001-6389-5399; Canelli, Florencia/0000-0001-6361-2117; Warburton, Andreas/0000-0002-2298-7315; Gallas Torreira, Abraham Antonio/0000-0002-2745-7954; Scodellaro, Luca/0000-0002-4974-8330; Lazzizzera, Ignazio/0000-0001-5092-7531; ciocci, maria agnese /0000-0003-0002-5462; Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Annovi, Alberto/0000-0002-4649-4398; Ruiz, Alberto/0000-0002-3639-0368; Chiarelli, Giorgio/0000-0001-9851-4816; Ivanov, Andrew/0000-0002-9270-5643 NR 53 TC 619 Z9 618 U1 6 U2 43 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. 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Mulhearn, M Muller, T Munar, A Murat, P Nachtman, J Nahn, S Nakano, I Napora, R Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Niell, F Nigmanov, T Nodulman, L Oh, SH Oh, YD Ohsugi, T Okusawa, T Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Pompos, A Pondrom, L Pope, G Poukhov, O Pratt, T Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Ratnikov, F Ray, H Reichold, A Renton, P Rescigno, M Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Roy, A Ruiz, A Ryan, D Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Savard, P Savoy-Navarro, A Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scribano, A Sedov, A Seidel, S Seiya, Y Semenov, A Semeria, F Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Sidoti, A Sill, A Sinervo, P Slaughter, AJ Sliwa, K Snider, FD Snihur, R Spezziga, M Spiegel, L Spinella, F Spiropulu, M Stefanini, A Strologas, J Stuart, D Sukhanov, A Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thomas, TL Thompson, AS Thomson, E Tipton, P Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Toyoda, H Trischuk, W Tseng, J Tsybychev, D Turini, N Ukegawa, F Unverhau, T Vaiciulis, T Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wan, Z Wang, C Wang, MJ Wang, SM Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wolbers, S Wolter, M Worm, S Wu, X Wurthwein, F Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoshida, T Yu, I Yu, S Yun, JC Zanello, L Zanetti, A Zetti, F Zucchelli, S AF Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bell, WH Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Bortoletto, D Boudreau, J Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Byrum, KL Cabrera, S Campbell, M Carithers, W Carlsmith, D Castro, A Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Chu, ML Chung, JY Chung, WH Chung, YS Ciobanu, CI Clark, AG Coca, M Connolly, A Convery, M Conway, J Cordelli, M Cranshaw, J Culbertson, R Dagenhart, D D'Auria, S de Barbaro, P De Cecco, S Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Dominguez, A Donati, S D'Onofrio, M Dorigo, T Eddy, N Erbacher, R Errede, D Errede, S Eusebi, R Farrington, S Feild, RG Fernandez, JP Ferretti, C Field, RD Fiori, I Flaugher, B Flores-Castillo, LR Foster, GW Franklin, M Friedman, J Furic, I Gallinaro, M Garfinkel, AF Gay, C Gerdes, DW Gerstein, E Giagu, S Giannetti, P Giolo, K Giordani, M Giromini, P Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, J Gomez, G Goncharov, M Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Grosso-Pilcher, C Guenther, M da Costa, JG Haber, C Hahn, SR Halkiadakis, E Handler, R Happacher, F Hara, K Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Hennecke, M Herndon, M Hill, C Hocker, A Hoffman, KD Hou, S Huffman, BT Hughes, R Huston, J Incandela, J Introzzi, G Iori, M Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jones, M Kamon, T Kang, J Unel, MK Kartal, S Kasha, H Kato, Y Kennedy, RD Kephart, R Kilminster, B Kim, DH Kim, HS Kim, MJ Kim, SB Kim, SH Kim, TH Kim, YK Kirby, M Kirsch, L Klimenko, S Koehn, P Kondo, K Konigsberg, J Korn, A Korytov, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G LeCompte, T Le, Y Lee, J Lee, SW Leonardo, N Leone, S Lewis, JD Li, K Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Lockyer, NS Loginov, A Loreti, M Lucchesi, D Lukens, P Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Mangano, M Mariotti, M Martin, A Martin, M Martin, V Martinez, M Mazzanti, P McFarland, KS McIntyre, P Menguzzato, M Menzione, A Merkel, P Mesropian, C Meyer, A Miao, T Miller, JS Miller, R Miscetti, S Mitselmakher, G Moggi, N Moore, R Moulik, T Mukherjee, A Mulhearn, M Muller, T Munar, A Murat, P Nachtman, J Nahn, S Nakano, I Napora, R Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Niell, F Nigmanov, T Nodulman, L Oh, SH Oh, YD Ohsugi, T Okusawa, T Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Pompos, A Pondrom, L Pope, G Poukhov, O Pratt, T Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Ratnikov, F Ray, H Reichold, A Renton, P Rescigno, M Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Roy, A Ruiz, A Ryan, D Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Savard, P Savoy-Navarro, A Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scribano, A Sedov, A Seidel, S Seiya, Y Semenov, A Semeria, F Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Sidoti, A Sill, A Sinervo, P Slaughter, AJ Sliwa, K Snider, FD Snihur, R Spezziga, M Spiegel, L Spinella, F Spiropulu, M Stefanini, A Strologas, J Stuart, D Sukhanov, A Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thomas, TL Thompson, AS Thomson, E Tipton, P Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Toyoda, H Trischuk, W Tseng, J Tsybychev, D Turini, N Ukegawa, F Unverhau, T Vaiciulis, T Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wan, Z Wang, C Wang, MJ Wang, SM Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wolbers, S Wolter, M Worm, S Wu, X Wurthwein, F Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoshida, T Yu, I Yu, S Yun, JC Zanello, L Zanetti, A Zetti, F Zucchelli, S TI Comparison of three-jet events in p(p)over-bar collisions at root s=1.8 TeV to predictions from a next-to-leading order QCD calculation SO PHYSICAL REVIEW D LA English DT Article ID (P)OVER-BAR-P COLLISIONS; PPBAR COLLISIONS; HADRON COLLIDERS; MULTIJET EVENTS; CROSS-SECTION; SCATTERING; CDF; ENERGY; JETS; DISTRIBUTIONS AB The properties of three-jet events with total transverse energy greater than 320 GeV and individual jet energy greater than 20 GeV have been analyzed and compared to absolute predictions from a next-to-leading order (NLO) perturbative QCD calculation. These data, of integrated luminosity 86 pb(-1), were recorded by the CDF Experiment for p (p) over bar collisions at roots=1.8 TeV. This study tests a model of higher order QCD processes that result in gluon emission and may give some indication of the magnitude of the contribution of processes higher than NLO. The total cross section is measured to be 466+/-3(stat.)(-70)(+207)(syst.) pb. The differential cross section is furthermore measured for all kinematically accessible regions of the Dalitz plane, including those for which the theoretical prediction is unreliable. While the measured cross section is consistent with the theoretical prediction in magnitude, the two differ somewhat in shape in the Dalitz plane. C1 Univ Florida, Gainesville, FL 32611 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. 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 Davis, Davis, CA 95616 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Inst Nucl Res, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. UCL, London WC1E 6BT, England. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Univ New Mexico, Albuquerque, NM 87131 USA. Northwestern Univ, Evanston, IL 60208 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. 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. Rockefeller Univ, New York, NY 10021 USA. Univ Rome 1, Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Toronto, Inst Particle Phys, Toronto, ON M5S 1A7, Canada. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, 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 Univ Florida, Gainesville, FL 32611 USA. RI Paulini, Manfred/N-7794-2014; Cabrera Urban, Susana/H-1376-2015; Prokoshin, Fedor/E-2795-2012; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015; Leonardo, Nuno/M-6940-2016; Canelli, Florencia/O-9693-2016; Lancaster, Mark/C-1693-2008; Kim, Soo-Bong/B-7061-2014; Scodellaro, Luca/K-9091-2014; Connolly, Amy/J-3958-2013; Ruiz, Alberto/E-4473-2011; De Cecco, Sandro/B-1016-2012; Wolter, Marcin/A-7412-2012; St.Denis, Richard/C-8997-2012; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Ivanov, Andrew/A-7982-2013 OI Paulini, Manfred/0000-0002-6714-5787; Prokoshin, Fedor/0000-0001-6389-5399; Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133; Leonardo, Nuno/0000-0002-9746-4594; Canelli, Florencia/0000-0001-6361-2117; Scodellaro, Luca/0000-0002-4974-8330; Ruiz, Alberto/0000-0002-3639-0368; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Ivanov, Andrew/0000-0002-9270-5643 NR 31 TC 3 Z9 3 U1 1 U2 2 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 FEB PY 2005 VL 71 IS 3 AR 032002 DI 10.1103/PhysRevD.71.032002 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400008 ER PT J AU Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bell, WH Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Bortoletto, D Boudreau, J Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Byrum, KL Cabrera, S Campbell, M Carithers, W Carlsmith, D Castro, A Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Chu, ML Chung, JY Chung, WH Chung, YS Ciobanu, CI Clark, AG Coca, M Connolly, A Convery, M Conway, J Cordelli, M Cranshaw, J Culbertson, R Dagenhart, D D'Auria, S de Barbaro, P Cecco, SD Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Dominguez, A Donati, S D'Onofrio, M Dorigo, T Eddy, N Erbacher, R Errede, D Errede, S Eusebi, R Farrington, S Feild, RG Fernandez, JP Ferretti, C Field, RD Fiori, I Flaugher, B Flores-Castillo, LR Foster, GW Franklin, M Friedman, J Furic, I Gallinaro, M Garcia-Sciveres, M Garfinkel, AF Gay, C Gerdes, DW Gerstein, E Giagu, S Giannetti, P Giolo, K Giordani, M Giromini, P Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, J Gomez, G Goncharov, M Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Grosso-Pilcher, C Guenther, M da Costa, JG Haber, C Hahn, SR Halkiadakis, E Handler, R Happacher, F Hara, K Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Hennecke, M Herndon, M Hill, C Hocker, A Hoffman, KD Hou, S Huffman, BT Hughes, R Huston, J Incandela, J Introzzi, G Iori, M Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jones, M Kamon, T Kang, J Unel, MK Kartal, S Kasha, H Kato, Y Kennedy, RD Kephart, R Kilminster, B Kim, DH Kim, HS Kim, MJ Kim, SB Kim, SH Kim, TH Kim, YK Kirby, M Kirsch, L Klimenko, S Koehn, P Kondo, K Konigsberg, J Korn, A Korytov, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G LeCompte, T Le, Y Lee, J Lee, SW Leonardo, N Leone, S Lewis, JD Li, K Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Lockyer, NS Loginov, A Loreti, M Lucchesi, D Lukens, P Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Mangano, M Mariotti, M Martin, A Martin, M Martin, V Martinez, M Mazzanti, P McFarland, KS McIntyre, P Menguzzato, M Menzione, A Merkel, P Mesropian, C Meyer, A Miao, T Miller, JS Miller, R Miscetti, S Mitselmakher, G Moggi, N Moore, R Moulik, T Mukherjee, A Mulhearn, M Muller, T Munar, A Murat, P Nachtman, J Nahn, S Nakano, I Napora, R Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Niell, F Nigmanov, T Nodulman, L Oh, SH Oh, YD Ohsugi, T Okusawa, T Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Pompos, A Pondrom, L Pope, G Poukhov, O Pratt, T Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Ratnikov, F Ray, H Reichold, A Renton, P Rescigno, M Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Roy, A Ruiz, A Ryan, D Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Savard, P Savoy-Navarro, A Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scribano, A Sedov, A Seidel, S Seiya, Y Semenov, A Semeria, F Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Sidoti, A Sill, A Sinervo, P Slaughter, AJ Sliwa, K Snider, FD Snihur, R Spezziga, M Spiegel, L Spinella, F Spiropulu, M Stefanini, A Strologas, J Stuart, D Sukhanov, A Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Toyoda, H Trischuk, W Tseng, J Tsybychev, D Turini, N Ukegawa, F Unverhau, T Vaiciulis, T Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wan, Z Wang, C Wang, MJ Wang, SM Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wolbers, S Wolter, M Worm, S Wu, X Wurthwein, F Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoshida, T Yu, I Yu, S Yun, JC Zanello, L Zanetti, A Zetti, F Zucchelli, S AF Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, VE Barnett, BA Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Bell, WH Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Binkley, M Bisello, D Bishai, M Blair, RE Blocker, C Bloom, K Blumenfeld, B Bocci, A Bodek, A Bolla, G Bolshov, A Bortoletto, D Boudreau, J Bromberg, C Brubaker, E Budagov, J Budd, HS Burkett, K Busetto, G Byrum, KL Cabrera, S Campbell, M Carithers, W Carlsmith, D Castro, A Cauz, D Cerri, A Cerrito, L Chapman, J Chen, C Chen, YC Chertok, M Chiarelli, G Chlachidze, G Chlebana, F Chu, ML Chung, JY Chung, WH Chung, YS Ciobanu, CI Clark, AG Coca, M Connolly, A Convery, M Conway, J Cordelli, M Cranshaw, J Culbertson, R Dagenhart, D D'Auria, S de Barbaro, P Cecco, SD Dell'Agnello, S Dell'Orso, M Demers, S Demortier, L Deninno, M De Pedis, D Derwent, PF Dionisi, C Dittmann, JR Dominguez, A Donati, S D'Onofrio, M Dorigo, T Eddy, N Erbacher, R Errede, D Errede, S Eusebi, R Farrington, S Feild, RG Fernandez, JP Ferretti, C Field, RD Fiori, I Flaugher, B Flores-Castillo, LR Foster, GW Franklin, M Friedman, J Furic, I Gallinaro, M Garcia-Sciveres, M Garfinkel, AF Gay, C Gerdes, DW Gerstein, E Giagu, S Giannetti, P Giolo, K Giordani, M Giromini, P Glagolev, V Glenzinski, D Gold, M Goldschmidt, N Goldstein, J Gomez, G Goncharov, M Gorelov, I Goshaw, AT Gotra, Y Goulianos, K Gresele, A Grosso-Pilcher, C Guenther, M da Costa, JG Haber, C Hahn, SR Halkiadakis, E Handler, R Happacher, F Hara, K Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Hennecke, M Herndon, M Hill, C Hocker, A Hoffman, KD Hou, S Huffman, BT Hughes, R Huston, J Incandela, J Introzzi, G Iori, M Issever, C Ivanov, A Iwata, Y Iyutin, B James, E Jones, M Kamon, T Kang, J Unel, MK Kartal, S Kasha, H Kato, Y Kennedy, RD Kephart, R Kilminster, B Kim, DH Kim, HS Kim, MJ Kim, SB Kim, SH Kim, TH Kim, YK Kirby, M Kirsch, L Klimenko, S Koehn, P Kondo, K Konigsberg, J Korn, A Korytov, A Kroll, J Kruse, M Krutelyov, V Kuhlmann, SE Kuznetsova, N Laasanen, AT Lami, S Lammel, S Lancaster, J Lancaster, M Lander, R Lannon, K Lath, A Latino, G LeCompte, T Le, Y Lee, J Lee, SW Leonardo, N Leone, S Lewis, JD Li, K Lin, CS Lindgren, M Liss, TM Litvintsev, DO Liu, T Lockyer, NS Loginov, A Loreti, M Lucchesi, D Lukens, P Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Manca, G Mangano, M Mariotti, M Martin, A Martin, M Martin, V Martinez, M Mazzanti, P McFarland, KS McIntyre, P Menguzzato, M Menzione, A Merkel, P Mesropian, C Meyer, A Miao, T Miller, JS Miller, R Miscetti, S Mitselmakher, G Moggi, N Moore, R Moulik, T Mukherjee, A Mulhearn, M Muller, T Munar, A Murat, P Nachtman, J Nahn, S Nakano, I Napora, R Nelson, C Nelson, T Neu, C Neubauer, MS Newman-Holmes, C Niell, F Nigmanov, T Nodulman, L Oh, SH Oh, YD Ohsugi, T Okusawa, T Orejudos, W Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Patrick, J Pauletta, G Paulini, M Pauly, T Paus, C Pellett, D Penzo, A Phillips, TJ Piacentino, G Piedra, J Pitts, KT Pompos, A Pondrom, L Pope, G Poukhov, O Pratt, T Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Rademacker, J Rakitine, A Ratnikov, F Ray, H Reichold, A Renton, P Rescigno, M Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Rott, C Roy, A Ruiz, A Ryan, D Safonov, A St Denis, R Sakumoto, WK Saltzberg, D Sanchez, C Sansoni, A Santi, L Sarkar, S Savard, P Savoy-Navarro, A Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scribano, A Sedov, A Seidel, S Seiya, Y Semenov, A Semeria, F Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Sidoti, A Sill, A Sinervo, P Slaughter, AJ Sliwa, K Snider, FD Snihur, R Spezziga, M Spiegel, L Spinella, F Spiropulu, M Stefanini, A Strologas, J Stuart, D Sukhanov, A Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Tecchio, M Teng, PK Terashi, K Tesarek, RJ Tether, S Thom, J Thompson, AS Thomson, E Tipton, P Tkaczyk, S Toback, D Tollefson, K Tonelli, D Tonnesmann, M Toyoda, H Trischuk, W Tseng, J Tsybychev, D Turini, N Ukegawa, F Unverhau, T Vaiciulis, T Varganov, A Vataga, E Vejcik, S Velev, G Veramendi, G Vidal, R Vila, I Vilar, R Volobouev, I von der Mey, M Wagner, RG Wagner, RL Wagner, W Wan, Z Wang, C Wang, MJ Wang, SM Ward, B Waschke, S Waters, D Watts, T Weber, M Wester, WC Whitehouse, B Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Wolbers, S Wolter, M Worm, S Wu, X Wurthwein, F Yang, UK Yao, W Yeh, GP Yi, K Yoh, J Yoshida, T Yu, I Yu, S Yun, JC Zanello, L Zanetti, A Zetti, F Zucchelli, S CA CDF Collaboration TI Measurement of the W boson polarization in top decay at CDF at root s=1.8 TeV SO PHYSICAL REVIEW D LA English DT Article ID SILICON VERTEX DETECTOR; COLLIDER DETECTOR; PARTON DISTRIBUTIONS; SYMMETRY-BREAKING; HADRON COLLIDERS; STANDARD-MODEL; QUARK MASS; FERMILAB; PHYSICS; TESTS AB The polarization of the W boson in t-->Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t-->Wb and the lepton from W-->lnu whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (f(V+A)) of the W produced from the decay of the top quark in the hypothesis of V+A structure of the tWb vertex. We find no evidence for the nonstandard V+A vertex and set a limit on f(V+A) < 0.80 at 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit on f(V+A) < 0.61 at 95% CL. This corresponds to a constraint on the right-handed helicity component of the W polarization of f(+)<0.18 at 95% CL. This limit is the first significant direct constraint on f(V+A) in top decay. C1 Univ Florida, Gainesville, FL 32611 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. 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 Davis, Davis, CA 95616 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Inst Nucl Res, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. UCL, London WC1E 6BT, England. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Inst Theoret & Expt Phys, Moscow 117259, Russia. Univ New Mexico, Albuquerque, NM 87131 USA. Northwestern Univ, Evanston, IL 60208 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. 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. Univ Roma 1, Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Toronto, Inst Particle Phys, Toronto, ON M5S 1A7, Canada. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, 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 Univ Florida, Gainesville, FL 32611 USA. RI vilar, rocio/P-8480-2014; Cabrera Urban, Susana/H-1376-2015; Introzzi, Gianluca/K-2497-2015; Gorelov, Igor/J-9010-2015; Lancaster, Mark/C-1693-2008; Ruiz, Alberto/E-4473-2011; Wolter, Marcin/A-7412-2012; St.Denis, Richard/C-8997-2012; Azzi, Patrizia/H-5404-2012; manca, giulia/I-9264-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Ivanov, Andrew/A-7982-2013; Prokoshin, Fedor/E-2795-2012; Kim, Soo-Bong/B-7061-2014; Scodellaro, Luca/K-9091-2014; Connolly, Amy/J-3958-2013 OI Introzzi, Gianluca/0000-0002-1314-2580; Gorelov, Igor/0000-0001-5570-0133; Ruiz, Alberto/0000-0002-3639-0368; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Ivanov, Andrew/0000-0002-9270-5643; Prokoshin, Fedor/0000-0001-6389-5399; Scodellaro, Luca/0000-0002-4974-8330; NR 32 TC 24 Z9 24 U1 1 U2 3 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 FEB PY 2005 VL 71 IS 3 AR 031101 DI 10.1103/PhysRevD.71.031101 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400001 ER PT J AU Airapetian, A Akopov, N Akopov, Z Amarian, M Andrus, A Aschenauer, EC Augustyniak, W Avakian, R Avetissian, A Avetissian, E Bailey, P Balin, D Beckmann, M Belostotski, S Bianchi, N Blok, HP Bottcher, H Borissov, A Borysenko, A Bouwhuis, M Brull, A Bryzgalov, V Capiluppi, M Capitani, GP Chen, T Ciullo, G Contalbrigo, M Dalpiaz, PF Deconinck, W De Leo, R Demey, M De Nardo, L De Sanctis, E Devitsin, E Diefenthaler, M Di Nezza, P Drechsler, J Duren, M Ehrenfried, M Elalaoui-Moulay, A Elbakian, G Ellinghaus, F Elschenbroich, U Fabbri, R Fantoni, A Felawka, L Frullani, S Funel, A Gapienko, G Gapienko, V Garibaldi, F Garrow, K Gavrilov, G Gharibyan, V Giordano, F Grebeniouk, O Gregor, IM Hadjidakis, C Hafidi, K Hartig, M Hasch, D Hesselink, WHA Hillenbrand, A Hoek, M Holler, Y Hommez, B Hristova, I Iarygin, G Ivanilov, A Izotov, A Jackson, HE Jgoun, A Kaiser, R Keri, T Kinney, E Kisselev, A Kobayashi, T Kopytin, M Korotkov, V Kozlov, V Krauss, B Krivokhijine, VG Lagamba, L Lapikas, L Laziev, A Lenisa, P Liebing, P Linden-Levy, LA Lorenzon, W Lu, H Lu, J Lu, S Ma, BQ Maiheu, B Makins, NCR Mao, Y Marianski, B Marukyan, H Masoli, F Mexner, V Meyners, N Michler, T Mikloukho, O Miller, CA Miyachi, Y Muccifora, V Murray, M Nagaitsev, A Nappi, E Naryshkin, Y Negodaev, M Nowak, WD Oganessyan, K Ohsuga, H Osborne, A Pickert, N Potterveld, DH Raithel, M Reggiani, D Reimer, PE Reischl, A Reolon, AR Riedl, C Rith, K Rosner, G Rostomyan, A Rubacek, L Rubin, J Ryckbosch, D Salomatin, Y Sanjiev, I Savin, I Schafer, A Schnell, G Schuler, KP Seele, J Seidl, R Seitz, B Shearer, C Shibata, TA Shutov, V Sinram, K Sommer, W Stancari, M Statera, M Steffens, E Steijger, JJM Stenzel, H Stewart, J Stinzing, F Tait, P Tanaka, H Taroian, S Tchuiko, B Terkulov, A Trzcinski, A Tytgat, M Vandenbroucke, A van der Nat, PB van der Steenhoven, G van Haarlem, Y Vikhrov, V Vincter, MG Vogel, C Volmer, J Wang, S Wendland, J Ye, Y Ye, Z Yen, S Zihlmann, B Zupranski, P AF Airapetian, A Akopov, N Akopov, Z Amarian, M Andrus, A Aschenauer, EC Augustyniak, W Avakian, R Avetissian, A Avetissian, E Bailey, P Balin, D Beckmann, M Belostotski, S Bianchi, N Blok, HP Bottcher, H Borissov, A Borysenko, A Bouwhuis, M Brull, A Bryzgalov, V Capiluppi, M Capitani, GP Chen, T Ciullo, G Contalbrigo, M Dalpiaz, PF Deconinck, W De Leo, R Demey, M De Nardo, L De Sanctis, E Devitsin, E Diefenthaler, M Di Nezza, P Drechsler, J Duren, M Ehrenfried, M Elalaoui-Moulay, A Elbakian, G Ellinghaus, F Elschenbroich, U Fabbri, R Fantoni, A Felawka, L Frullani, S Funel, A Gapienko, G Gapienko, V Garibaldi, F Garrow, K Gavrilov, G Gharibyan, V Giordano, F Grebeniouk, O Gregor, IM Hadjidakis, C Hafidi, K Hartig, M Hasch, D Hesselink, WHA Hillenbrand, A Hoek, M Holler, Y Hommez, B Hristova, I Iarygin, G Ivanilov, A Izotov, A Jackson, HE Jgoun, A Kaiser, R Keri, T Kinney, E Kisselev, A Kobayashi, T Kopytin, M Korotkov, V Kozlov, V Krauss, B Krivokhijine, VG Lagamba, L Lapikas, L Laziev, A Lenisa, P Liebing, P Linden-Levy, LA Lorenzon, W Lu, H Lu, J Lu, S Ma, BQ Maiheu, B Makins, NCR Mao, Y Marianski, B Marukyan, H Masoli, F Mexner, V Meyners, N Michler, T Mikloukho, O Miller, CA Miyachi, Y Muccifora, V Murray, M Nagaitsev, A Nappi, E Naryshkin, Y Negodaev, M Nowak, WD Oganessyan, K Ohsuga, H Osborne, A Pickert, N Potterveld, DH Raithel, M Reggiani, D Reimer, PE Reischl, A Reolon, AR Riedl, C Rith, K Rosner, G Rostomyan, A Rubacek, L Rubin, J Ryckbosch, D Salomatin, Y Sanjiev, I Savin, I Schafer, A Schnell, G Schuler, KP Seele, J Seidl, R Seitz, B Shearer, C Shibata, TA Shutov, V Sinram, K Sommer, W Stancari, M Statera, M Steffens, E Steijger, JJM Stenzel, H Stewart, J Stinzing, F Tait, P Tanaka, H Taroian, S Tchuiko, B Terkulov, A Trzcinski, A Tytgat, M Vandenbroucke, A van der Nat, PB van der Steenhoven, G van Haarlem, Y Vikhrov, V Vincter, MG Vogel, C Volmer, J Wang, S Wendland, J Ye, Y Ye, Z Yen, S Zihlmann, B Zupranski, P CA HERMES Collaboration TI Search for an exotic S =-2, Q =-2 baryon resonance at a mass near 1862 MeV in quasireal photoproduction SO PHYSICAL REVIEW D LA English DT Article ID POSITIVE-STRANGENESS; SKYRME MODEL; NARROW; PENTAQUARKS; THETA(+); DETECTOR; DECUPLET; PHYSICS; ENERGY; STATE AB A search for an exotic baryon resonance with S=-2, Q=-2 has been performed in quasireal photoproduction on a deuterium target through the decay channel Xi(-)pi(-)-->Lambdapi(-)pi(-)-->ppi(-)pi(-)pi(-). No evidence for a previously reported Xi(--)(1860) resonance is found in the Xi(-)pi(-) invariant mass spectrum. An upper limit for the photoproduction cross section of 2.1 nb is found at the 90% confidence level. The photoproduction cross section for the Xi(0)(1530) is found to be between 9 and 24 nb. C1 Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Ist Nazl Fis Nucl, Sez Bari, I-70124 Bari, Italy. Peking Univ, Sch Phys, Beijing 100871, Peoples R China. Univ Sci & Technol China, Dept Modern Phys, Anhua 230026, Peoples R China. Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA. DESY, D-22603 Hamburg, Germany. DESY, D-15738 Zeuthen, Germany. Joint Inst Nucl Res, Dubna 141980, Russia. Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany. Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium. Univ Giessen, Inst Phys, D-35392 Giessen, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. PN Lebedev Phys Inst, Moscow 117924, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Petersburg Nucl Phys Inst, Gatchina 188350, Russia. Inst High Energy Phys, Protvino 142281, Moscow Region, Russia. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy. Ist Super Sanita, Phys Lab, I-00161 Rome, Italy. Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada. TRIUMF, Vancouver, BC V6T 2A3, Canada. Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan. Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands. Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland. Yerevan Phys Inst, Yerevan 375036, Armenia. RP Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. RI Deconinck, Wouter/F-4054-2012; Gavrilov, Gennady/C-6260-2013; Reimer, Paul/E-2223-2013; Negodaev, Mikhail/A-7026-2014; El Alaoui, Ahmed/B-4638-2015; Kozlov, Valentin/M-8000-2015; Terkulov, Adel/M-8581-2015; OI Deconinck, Wouter/0000-0003-4033-6716; Lagamba, Luigi/0000-0002-0233-9812; Hoek, Matthias/0000-0002-1893-8764 NR 39 TC 20 Z9 20 U1 1 U2 7 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 FEB PY 2005 VL 71 IS 3 AR 032004 DI 10.1103/PhysRevD.71.032004 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400010 ER PT J AU Andreotti, M Bagnasco, S Baldini, W Bettoni, D Borreani, G Buzzo, A Calabrese, R Cester, R Cibinetto, G Dalpiaz, P Garzoglio, G Gollwitzer, KE Graham, M Hu, M Joffe, D Kasper, J Lasio, G Lo Vetere, M Luppi, E Macri, M Mandelkern, M Marchetto, F Marinelli, M Menichetti, E Metreveli, Z Mussa, R Negrini, M Obertino, MM Pallavicini, M Pastrone, N Patrignani, C Pedlar, TK Pordes, S Robutti, E Roethel, W Rosen, JL Rumerio, P Rusack, R Santroni, A Schultz, J Seo, SH Seth, KK Stancari, G Stancari, M Tomaradze, A Uman, I Vidnovic, T Werkema, S Zweber, P AF Andreotti, M Bagnasco, S Baldini, W Bettoni, D Borreani, G Buzzo, A Calabrese, R Cester, R Cibinetto, G Dalpiaz, P Garzoglio, G Gollwitzer, KE Graham, M Hu, M Joffe, D Kasper, J Lasio, G Lo Vetere, M Luppi, E Macri, M Mandelkern, M Marchetto, F Marinelli, M Menichetti, E Metreveli, Z Mussa, R Negrini, M Obertino, MM Pallavicini, M Pastrone, N Patrignani, C Pedlar, TK Pordes, S Robutti, E Roethel, W Rosen, JL Rumerio, P Rusack, R Santroni, A Schultz, J Seo, SH Seth, KK Stancari, G Stancari, M Tomaradze, A Uman, I Vidnovic, T Werkema, S Zweber, P CA FNAL Expt E835 TI Measurement of the branching ratios psi(')-> e(+)e(-), psi '-> J/psi pi pi, and psi '-> J/psi eta SO PHYSICAL REVIEW D LA English DT Article ID HADRONIC TRANSITIONS; EXPERIMENT E835; DECAYS; STATES; FERMILAB AB We have measured several branching ratios for psi(') decay using the data collected by the FNAL E835 experiment during the year 2000, obtaining B(psi(')-->e(+)e(-))=0.0068+/-0.0001+/-0.0004, B(psi(')-->J/psipi(+)pi(-))=0.292+/-0.005+/-0.018, B(psi(')-->J/psipi(0)pi(0))=0.167+/-0.005+/-0.014, and B(psi(')-->J/psieta)=0.028+/-0.002+/-0.002. We also present a measurement of the dipion mass distribution in the decays psi(')-->J/psipipi. C1 Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Ferrara, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Univ Genoa, I-16146 Genoa, Italy. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Minnesota, Minneapolis, MN 55455 USA. Northwestern Univ, Evanston, IL 60208 USA. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, I-10125 Turin, Italy. RP Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. RI Pallavicini, Marco/G-5500-2012; Patrignani, Claudia/C-5223-2009; Bagnasco, Stefano/J-4324-2012; Negrini, Matteo/C-8906-2014; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Lo Vetere, Maurizio/J-5049-2012 OI Pallavicini, Marco/0000-0001-7309-3023; Patrignani, Claudia/0000-0002-5882-1747; Negrini, Matteo/0000-0003-0101-6963; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Lo Vetere, Maurizio/0000-0002-6520-4480 NR 27 TC 5 Z9 5 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 3 AR 032006 DI 10.1103/PhysRevD.71.032006 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400012 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Karyotakis, Y Lees, JP Poireau, V Tisserand, V Zghiche, A Grauges-Pous, E Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Wenzel, WA Barrett, M Ford, KE Harrison, TJ Hart, AJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Schroeder, T Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, 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Kozanecki, W Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Wilson, JR Yumiceva, FX Abe, T Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Claus, R Convery, MR Cristinziani, M De Nardo, G Dingfelder, JC Dong, D Dorfan, J Dujmic, D Dunwoodie, W Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Snyder, A Soha, A Stelzer, J Strube, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Majewski, SA Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Martinez-Vidal, F Panvini, RS Banerjee, S Bhuyan, B Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Sobie, RJ Back, JJ Harrison, PF Mohanty, GB Band, HR Chen, X Cheng, B Dasu, S Datta, M Eichenbaum, AM Flood, KT Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Mihalyi, A Pan, Y Prepost, R Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Greene, MG Neal, H CA BaBar Collaboration TI Measurement of the ratio B(B-->(DK-)-K-*0)/B(B--> D-*0 pi(-)) and of the CP asymmetry of B-->(DCP+K)-K-*0- decays SO PHYSICAL REVIEW D LA English DT Article ID WEAK PHASE; B-MESONS; GAMMA AB We study the decays B--->D(*0)pi(-) and B--->(DK-)-K-*0, where the D-*0 decays into D(0)pi(0), with the D-0 reconstructed in the CP-even (CP+) eigenstates K-K+ and pi(-)pi(+) and in the (non-CP) channels K(-)pi(+), K(-)pi(+)pi(+)pi(-), and K(-)pi(+)pi(0). Using a sample of about 123x10(6) B (B) over bar pairs, we measure the ratios of decay rates R-non-CP(*)=B(B--->(Dnon-CPK-)-K-*0)B(B--->D(non-CP)(*0)pi(-)=0.0813+/-0.0040(stat)(-0.0031)(+0.0042)(syst), and provide the first measurements of R(CP+)(*)equivalent toB(B--->(DCP+K-)-K-*0)B(B--->D(CP+)(*0)pi(-))=0.086+/-0.021(stat)+/-0.007(syst), and of the CP asymmetry A(CP+)(*)=B(B--->(DCP+K-)-K-*0)-B(B+-->(DCP+K+)-K-*0)B(B--->(DCP+K-)-K-*0)+B(B+-->(DCP+K+)-K-*0)=-0.10+/-0.23(stat)(-0.04)(+0.03)(syst). C1 Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. Univ Autonoma Barcelona, E-08193 Barcelona, Spain. Univ Bari, Dipartimento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. 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Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. Univ Basilicata, I-85100 Potenza, Italy. RP Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. RI Cavallo, Nicola/F-8913-2012; Saeed, Mohammad Alam/J-7455-2012; de Groot, Nicolo/A-2675-2009; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Neri, Nicola/G-3991-2012; Forti, Francesco/H-3035-2011; Rotondo, Marcello/I-6043-2012; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; M, Saleem/B-9137-2013; Sarti, Alessio/I-2833-2012; Della Ricca, Giuseppe/B-6826-2013; Di Lodovico, Francesca/L-9109-2016; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Negrini, Matteo/C-8906-2014; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Kravchenko, Evgeniy/F-5457-2015; Calabrese, Roberto/G-4405-2015; Mir, Lluisa-Maria/G-7212-2015; Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere, Maurizio/J-5049-2012; Lusiani, Alberto/N-2976-2015; Morandin, Mauro/A-3308-2016; Lusiani, Alberto/A-3329-2016 OI Saeed, Mohammad Alam/0000-0002-3529-9255; Bellini, Fabio/0000-0002-2936-660X; Neri, Nicola/0000-0002-6106-3756; Forti, Francesco/0000-0001-6535-7965; Rotondo, Marcello/0000-0001-5704-6163; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; Sarti, Alessio/0000-0001-5419-7951; Della Ricca, Giuseppe/0000-0003-2831-6982; Di Lodovico, Francesca/0000-0003-3952-2175; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Negrini, Matteo/0000-0003-0101-6963; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Mir, Lluisa-Maria/0000-0002-4276-715X; Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480; Lusiani, Alberto/0000-0002-6876-3288; Morandin, Mauro/0000-0003-4708-4240; Lusiani, Alberto/0000-0002-6876-3288 NR 21 TC 12 Z9 12 U1 0 U2 5 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 FEB PY 2005 VL 71 IS 3 AR 031102 DI 10.1103/PhysRevD.71.031102 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400002 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Karyotakis, Y Lees, JP Poireau, V Tisserand, V Zghiche, A Grauges-Pous, E Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Wenzel, WA Barrett, M Ford, KE Harrison, TJ Hart, AJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Schroeder, T Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, 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Christ, S Schroder, H Wagner, G Waldi, R Adye, T De Groot, N Franek, B Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Wilson, JR Yumiceva, FX Abe, T Allen, M Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Claus, R Convery, MR Cristinziani, M De Nardo, G Dingfelder, JC Dong, D Dorfan, J Dujmic, D Dunwoodie, W Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Snyder, A Soha, A Stelzer, J Strube, J Su, D Sullivan, MK Thompson, J Va'vra, J Wagner, SR Weaver, M Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Majewski, SA Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Martinez-Vidal, F Panvini, RS Banerjee, S Bhuyan, B Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Sobie, RJ Back, JJ Harrison, PF Mohanty, GB Band, HR Chen, X Cheng, B Dasu, S Datta, M Eichenbaum, AM Flood, KT Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Mihalyi, A Pan, Y Prepost, R Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Greene, MG Neal, H CA BaBar Collaboration TI Search for a charged partner of the X(3872) in the B meson decay B -> X-K, X--> J/psi pi(-)pi(0) SO PHYSICAL REVIEW D LA English DT Article ID STATE AB We search for a charged partner of the X(3872) in the decay B-->X-K, X--->J/psipi(-)pi(0), using 234x10(6) B (B) over bar events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e(+)e(-) asymmetric-energy storage ring. 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Univ Mississippi, University, MS 38677 USA. Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada. Mt Holyoke Coll, S Hadley, MA 01075 USA. Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy. Univ Naples Federico II, Ist Nazl Fis Nucl, I-80126 Naples, Italy. NIKHEF H, Natl Inst Nucl & High Energy Phys, NL-1009 DB Amsterdam, Netherlands. Univ Notre Dame, Notre Dame, IN 46556 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Univ Padua, Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Paris 06, Lab Phys Nucl & Hautes Energies, F-75252 Paris, France. Univ Paris 07, F-75252 Paris, France. Univ Penn, Philadelphia, PA 19104 USA. Scuola Normale Super Pisa, Dipartimento Fis, I-56127 Pisa, Italy. Univ Pisa, Ist Nazl Fis Nucl, I-56127 Pisa, Italy. Prairie View A&M Univ, Prairie View, TX 77446 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Univ Roma La Sapienza, Ist Nazl Fis Nucl, I-00185 Rome, Italy. Univ Rostock, D-18051 Rostock, Germany. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA Saclay, DSM Dapnia, F-91191 Gif Sur Yvette, France. Univ S Carolina, Columbia, SC 29208 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Stanford, CA 94305 USA. SUNY Albany, Albany, NY 12222 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Univ Turin, Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy. Univ Trieste, Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Univ Valencia, E-46100 Burjassot, Valencia, Spain. Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. Univ Wisconsin, Madison, WI 53706 USA. Univ Basilicata, I-85100 Potenza, Italy. Yale Univ, New Haven, CT 06511 USA. RP Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. RI Lusiani, Alberto/A-3329-2016; Morandin, Mauro/A-3308-2016; Della Ricca, Giuseppe/B-6826-2013; Di Lodovico, Francesca/L-9109-2016; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; M, Saleem/B-9137-2013; Sarti, Alessio/I-2833-2012; de Groot, Nicolo/A-2675-2009; Cavallo, Nicola/F-8913-2012; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Neri, Nicola/G-3991-2012; Forti, Francesco/H-3035-2011; Rotondo, Marcello/I-6043-2012; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; Saeed, Mohammad Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Kravchenko, Evgeniy/F-5457-2015; Calabrese, Roberto/G-4405-2015; Mir, Lluisa-Maria/G-7212-2015; Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere, Maurizio/J-5049-2012; Grancagnolo, Sergio/J-3957-2015; Lusiani, Alberto/N-2976-2015 OI Lusiani, Alberto/0000-0002-6876-3288; Morandin, Mauro/0000-0003-4708-4240; Della Ricca, Giuseppe/0000-0003-2831-6982; Di Lodovico, Francesca/0000-0003-3952-2175; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Sarti, Alessio/0000-0001-5419-7951; Bellini, Fabio/0000-0002-2936-660X; Neri, Nicola/0000-0002-6106-3756; Forti, Francesco/0000-0001-6535-7965; Rotondo, Marcello/0000-0001-5704-6163; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini, Matteo/0000-0003-0101-6963; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Mir, Lluisa-Maria/0000-0002-4276-715X; Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480; Grancagnolo, Sergio/0000-0001-8490-8304; Lusiani, Alberto/0000-0002-6876-3288 NR 29 TC 59 Z9 60 U1 0 U2 4 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 FEB PY 2005 VL 71 IS 3 AR 031501 DI 10.1103/PhysRevD.71.031501 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400005 ER PT J AU Aubert, B Barate, R Boutigny, D Couderc, F Karyotakis, Y Lees, JP Poireau, V Tisserand, V Zghiche, A Grauges-Pous, E Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Wenzel, WA Barrett, M Ford, KE Harrison, TJ Hart, AJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Schroeder, T Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, D Khan, A Kyberd, P Teodorescu, L Blinov, AE Blinov, VE Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Weinstein, AJR Foulkes, SD Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Cunha, A Dahmes, B Hong, TM Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Kroseberg, J Lockman, WS Nesom, G Schalk, T Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Blanc, F Bloom, P Chen, S Ford, WT Nauenberg, U Olivas, A Rankin, P Smith, JG Ulmer, KA Zhang, J Zhang, L Chen, A Eckhart, EA Harton, JL Soffer, A Toki, WH Wilson, RJ Zeng, Q Spaan, B Altenburg, D Brandt, T Brose, J Dickopp, M Feltresi, E Hauke, A Lacker, HM Muller-Pfefferkorn, R Nogowski, R Otto, S Petzold, A Schubert, J Schubert, KR Schwierz, R Sundermann, JE Bernard, D Bonneaud, GR Brochard, F Grenier, P Schrenk, S Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Clark, PJ Lavin, DR Muheim, F Playfer, S Xie, Y Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Piemontese, L Sarti, A Treadwell, E Anulli, F Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Peruzzi, IM Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Chaisanguanthum, KS Morii, M Won, E Dubitzky, RS Langenegger, U Marks, J Uwer, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Nikolich, MB Taylor, GP Charles, MJ Grenier, GJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Rubin, AE Yi, J Biasini, M Covarelli, R Pioppi, M Davier, M Giroux, X Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Chavez, CA Coleman, JP Forster, IJ Fry, JR Gabathuler, E Gamet, R Hutchcroft, DE Parry, RJ Payne, DJ Touramanis, C Cormack, CM Di Lodovico, F Brown, CL Cowan, G Flack, RL Flaecher, HU Green, MG Jackson, PS McMahon, TR Ricciardi, S Salvatore, F Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Sekula, SJ Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Lombardo, V Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Bulten, H Raven, G Snoek, HL Wilden, L Jessop, CP LoSecco, JM Allmendinger, T Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Rahimi, AM Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Lu, M Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Malcles, J Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Behera, PK Gladney, L Guo, QH Panetta, J Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Forti, F Giorgi, MA Lusiani, A Marchiori, G Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Simi, G Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lau, YP Lu, C Miftakov, V Olsen, J Smith, AJS Telnov, AV Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Gioi, LL Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Wilson, JR Yumiceva, FX Abe, T Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Claus, R Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Snyder, A Soha, A Stelzer, J Strube, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Majewski, SA Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Martinez-Vidal, F Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Sobie, RJ Back, JJ Harrison, PF Mohanty, GB Band, HR Chen, X Cheng, B Dasu, S Datta, M Eichenbaum, AM Flood, KT Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Mihalyi, A Pan, Y Prepost, R Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Greene, MG Neal, H AF Aubert, B Barate, R Boutigny, D Couderc, F Karyotakis, Y Lees, JP Poireau, V Tisserand, V Zghiche, A Grauges-Pous, E Palano, A Pompili, A Chen, JC Qi, ND Rong, G Wang, P Zhu, YS Eigen, G Ofte, I Stugu, B Abrams, GS Borgland, AW Breon, AB Brown, DN Button-Shafer, J Cahn, RN Charles, E Day, CT Gill, MS Gritsan, AV Groysman, Y Jacobsen, RG Kadel, RW Kadyk, J Kerth, LT Kolomensky, YG Kukartsev, G Lynch, G Mir, LM Oddone, PJ Orimoto, TJ Pripstein, M Roe, NA Ronan, MT Wenzel, WA Barrett, M Ford, KE Harrison, TJ Hart, AJ Hawkes, CM Morgan, SE Watson, AT Fritsch, M Goetzen, K Held, T Koch, H Lewandowski, B Pelizaeus, M Schroeder, T Steinke, M Boyd, JT Chevalier, N Cottingham, WN Kelly, MP Latham, TE Wilson, FF Cuhadar-Donszelmann, T Hearty, C Knecht, NS Mattison, TS McKenna, JA Thiessen, D Khan, A Kyberd, P Teodorescu, L Blinov, AE Blinov, VE Druzhinin, VP Golubev, VB Ivanchenko, VN Kravchenko, EA Onuchin, AP Serednyakov, SI Skovpen, YI Solodov, EP Yushkov, AN Best, D Bruinsma, M Chao, M Eschrich, I Kirkby, D Lankford, AJ Mandelkern, M Mommsen, RK Roethel, W Stoker, DP Buchanan, C Hartfiel, BL Weinstein, AJR Foulkes, SD Gary, JW Shen, BC Wang, K del Re, D Hadavand, HK Hill, EJ MacFarlane, DB Paar, HP Rahatlou, S Sharma, V Berryhill, JW Campagnari, C Cunha, A Dahmes, B Hong, TM Lu, A Mazur, MA Richman, JD Verkerke, W Beck, TW Eisner, AM Heusch, CA Kroseberg, J Lockman, WS Nesom, G Schalk, T Schumm, BA Seiden, A Spradlin, P Williams, DC Wilson, MG Albert, J Chen, E Dubois-Felsmann, GP Dvoretskii, A Hitlin, DG Narsky, I Piatenko, T Porter, FC Ryd, A Samuel, A Yang, S Jayatilleke, S Mancinelli, G Meadows, BT Sokoloff, MD Blanc, F Bloom, P Chen, S Ford, WT Nauenberg, U Olivas, A Rankin, P Smith, JG Ulmer, KA Zhang, J Zhang, L Chen, A Eckhart, EA Harton, JL Soffer, A Toki, WH Wilson, RJ Zeng, Q Spaan, B Altenburg, D Brandt, T Brose, J Dickopp, M Feltresi, E Hauke, A Lacker, HM Muller-Pfefferkorn, R Nogowski, R Otto, S Petzold, A Schubert, J Schubert, KR Schwierz, R Sundermann, JE Bernard, D Bonneaud, GR Brochard, F Grenier, P Schrenk, S Thiebaux, C Vasileiadis, G Verderi, M Bard, DJ Clark, PJ Lavin, DR Muheim, F Playfer, S Xie, Y Andreotti, M Azzolini, V Bettoni, D Bozzi, C Calabrese, R Cibinetto, G Luppi, E Negrini, M Piemontese, L Sarti, A Treadwell, E Anulli, F Baldini-Ferroli, R Calcaterra, A de Sangro, R Finocchiaro, G Patteri, P Peruzzi, IM Piccolo, M Zallo, A Buzzo, A Capra, R Contri, R Crosetti, G Lo Vetere, M Macri, M Monge, MR Passaggio, S Patrignani, C Robutti, E Santroni, A Tosi, S Bailey, S Brandenburg, G Chaisanguanthum, KS Morii, M Won, E Dubitzky, RS Langenegger, U Marks, J Uwer, U Bhimji, W Bowerman, DA Dauncey, PD Egede, U Gaillard, JR Morton, GW Nash, JA Nikolich, MB Taylor, GP Charles, MJ Grenier, GJ Mallik, U Cochran, J Crawley, HB Lamsa, J Meyer, WT Prell, S Rosenberg, EI Rubin, AE Yi, J Biasini, M Covarelli, R Pioppi, M Davier, M Giroux, X Grosdidier, G Hocker, A Laplace, S Le Diberder, F Lepeltier, V Lutz, AM Petersen, TC Plaszczynski, S Schune, MH Tantot, L Wormser, G Cheng, CH Lange, DJ Simani, MC Wright, DM Bevan, AJ Chavez, CA Coleman, JP Forster, IJ Fry, JR Gabathuler, E Gamet, R Hutchcroft, DE Parry, RJ Payne, DJ Touramanis, C Cormack, CM Di Lodovico, F Brown, CL Cowan, G Flack, RL Flaecher, HU Green, MG Jackson, PS McMahon, TR Ricciardi, S Salvatore, F Winter, MA Brown, D Davis, CL Allison, J Barlow, NR Barlow, RJ Hodgkinson, MC Lafferty, GD Lyon, AJ Williams, JC Farbin, A Hulsbergen, WD Jawahery, A Kovalskyi, D Lae, CK Lillard, V Roberts, DA Blaylock, G Dallapiccola, C Hertzbach, SS Kofler, R Koptchev, VB Moore, TB Saremi, S Staengle, H Willocq, S Cowan, R Sciolla, G Sekula, SJ Taylor, F Yamamoto, RK Mangeol, DJJ Patel, PM Robertson, SH Lazzaro, A Lombardo, V Palombo, F Bauer, JM Cremaldi, L Eschenburg, V Godang, R Kroeger, R Reidy, J Sanders, DA Summers, DJ Zhao, HW Brunet, S Cote, D Taras, P Nicholson, H Cavallo, N Fabozzi, F Gatto, C Lista, L Monorchio, D Paolucci, P Piccolo, D Sciacca, C Baak, M Bulten, H Raven, G Snoek, HL Wilden, L Jessop, CP LoSecco, JM Allmendinger, T Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Rahimi, AM Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Lu, M Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Malcles, J Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Behera, PK Gladney, L Guo, QH Panetta, J Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Forti, F Giorgi, MA Lusiani, A Marchiori, G Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Simi, G Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lau, YP Lu, C Miftakov, V Olsen, J Smith, AJS Telnov, AV Bellini, F Cavoto, G Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Gioi, LL Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Wilson, JR Yumiceva, FX Abe, T Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Claus, R Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Snyder, A Soha, A Stelzer, J Strube, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Majewski, SA Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Martinez-Vidal, F Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Sobie, RJ Back, JJ Harrison, PF Mohanty, GB Band, HR Chen, X Cheng, B Dasu, S Datta, M Eichenbaum, AM Flood, KT Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Mihalyi, A Pan, Y Prepost, R Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Greene, MG Neal, H CA BaBar Collaboration TI Measurements of B meson decays to omega K-* and omega rho SO PHYSICAL REVIEW D LA English DT Article AB We describe searches for B meson decays to the charmless vector-vector final states omegaK(*) and omegarho in 89x10(6) B (B) over bar pairs produced in e(+)e(-) annihilation at roots=10.58 GeV. We measure the following branching fractions in units of 10(-6): B(B-0-->omegaK(*0))=3.4(-1.6)(+1.8)+/-0.4(<6.0), B(B+-->omegaK(*+))=3.5(-2.0)(+2.5)+/-0.7(<7.4), B(B-0-->omegarho(0))=0.6(-1.1)(+1.3)+/-0.4(<3.3), and B(B+-->omegarho(+))=12.6(-3.3)(+3.7)+/-1.6. The first error quoted is statistical, the second systematic, and the upper limits are defined at 90% confidence level. For B+-->omegarho(+) we also measure the longitudinal spin alignment fraction f(L)=0.88(-0.15)(+0.12)+/-0.03 and charge asymmetry A(ch)=(5+/-26+/-2)%. C1 Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. Univ Autonoma Barcelona, E-08193 Barcelona, Spain. Univ Bari, Dipartimento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany. Univ Bristol, Bristol BS8 1TL, Avon, England. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. CALTECH, Pasadena, CA 91125 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. Univ Colorado, Boulder, CO 80309 USA. Colorado State Univ, Ft Collins, CO 80523 USA. Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany. Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany. Ecole Polytech, LLR, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. 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RI Saeed, Mohammad Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Rotondo, Marcello/I-6043-2012; Neri, Nicola/G-3991-2012; Sarti, Alessio/I-2833-2012; Bellini, Fabio/D-1055-2009; de Groot, Nicolo/A-2675-2009; Lista, Luca/C-5719-2008; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Forti, Francesco/H-3035-2011; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; M, Saleem/B-9137-2013; Cavallo, Nicola/F-8913-2012; Grancagnolo, Sergio/J-3957-2015; Mir, Lluisa-Maria/G-7212-2015; Kravchenko, Evgeniy/F-5457-2015; Pappagallo, Marco/R-3305-2016; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Morandin, Mauro/A-3308-2016; Martinez Vidal, F*/L-7563-2014; Di Lodovico, Francesca/L-9109-2016; Peters, Klaus/C-2728-2008; Lo Vetere, Maurizio/J-5049-2012; Della Ricca, Giuseppe/B-6826-2013; Calabrese, Roberto/G-4405-2015; Lusiani, Alberto/A-3329-2016; Kolomensky, Yury/I-3510-2015; Lusiani, Alberto/N-2976-2015 OI Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini, Matteo/0000-0003-0101-6963; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Rotondo, Marcello/0000-0001-5704-6163; Neri, Nicola/0000-0002-6106-3756; Sarti, Alessio/0000-0001-5419-7951; Bellini, Fabio/0000-0002-2936-660X; Raven, Gerhard/0000-0002-2897-5323; Forti, Francesco/0000-0001-6535-7965; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; FORD, WILLIAM/0000-0001-8703-6943; Carpinelli, Massimo/0000-0002-8205-930X; Sciacca, Crisostomo/0000-0002-8412-4072; Adye, Tim/0000-0003-0627-5059; Lafferty, George/0000-0003-0658-4919; Wilson, Robert/0000-0002-8184-4103; Strube, Jan/0000-0001-7470-9301; Grancagnolo, Sergio/0000-0001-8490-8304; Mir, Lluisa-Maria/0000-0002-4276-715X; Pappagallo, Marco/0000-0001-7601-5602; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Morandin, Mauro/0000-0003-4708-4240; Martinez Vidal, F*/0000-0001-6841-6035; Di Lodovico, Francesca/0000-0003-3952-2175; Peters, Klaus/0000-0001-7133-0662; Lo Vetere, Maurizio/0000-0002-6520-4480; Della Ricca, Giuseppe/0000-0003-2831-6982; Calabrese, Roberto/0000-0002-1354-5400; Lusiani, Alberto/0000-0002-6876-3288; Kolomensky, Yury/0000-0001-8496-9975; Lusiani, Alberto/0000-0002-6876-3288 NR 20 TC 414 Z9 416 U1 7 U2 34 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. 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Jessop, CP LoSecco, JM Allmendinger, T Gan, KK Honscheid, K Hufnagel, D Kagan, H Kass, R Pulliam, T Rahimi, AM Ter-Antonyan, R Wong, QK Brau, J Frey, R Igonkina, O Potter, CT Sinev, NB Strom, D Torrence, E Colecchia, F Dorigo, A Galeazzi, F Margoni, M Morandin, M Posocco, M Rotondo, M Simonetto, F Stroili, R Tiozzo, G Voci, C Benayoun, M Briand, H Chauveau, J David, P de la Vaissiere, C Del Buono, L Hamon, O John, MJJ Leruste, P Malcles, J Ocariz, J Pivk, M Roos, L T'Jampens, S Therin, G Manfredi, PF Re, V Behera, PK Gladney, L Guo, QH Panetta, J Angelini, C Batignani, G Bettarini, S Bondioli, M Bucci, F Calderini, G Carpinelli, M Forti, F Giorgi, MA Lusiani, A Marchiori, G Martinez-Vidal, F Morganti, M Neri, N Paoloni, E Rama, M Rizzo, G Sandrelli, F Walsh, J Haire, M Judd, D Paick, K Wagoner, DE Danielson, N Elmer, P Lau, YP Lu, C Miftakov, V Olsen, J Smith, AJS Telnov, AV Bellini, F Faccini, R Ferrarotto, F Ferroni, F Gaspero, M Gioi, LL Mazzoni, MA Morganti, S Pierini, M Piredda, G Tehrani, FS Voena, C Cavoto, G Christ, S Wagner, G Waldi, R Adye, T De Groot, N Franek, B Geddes, NI Gopal, GP Olaiya, EO Aleksan, R Emery, S Gaidot, A Ganzhur, SF Giraud, PF de Monchenault, GH Kozanecki, W Legendre, M London, GW Mayer, B Schott, G Vasseur, G Yeche, C Zito, M Purohit, MV Weidemann, AW Wilson, JR Yumiceva, FX Abe, T Aston, D Bartoldus, R Berger, N Boyarski, AM Buchmueller, OL Claus, R Convery, MR Cristinziani, M De Nardo, G Dong, D Dorfan, J Dujmic, D Dunwoodie, W Elsen, EE Fan, S Field, RC Glanzman, T Gowdy, SJ Hadig, T Halyo, V Hast, C Hryn'ova, T Innes, WR Kelsey, MH Kim, P Kocian, ML Leith, DWGS Libby, J Luitz, S Luth, V Lynch, HL Marsiske, H Messner, R Muller, DR O'Grady, CP Ozcan, VE Perazzo, A Perl, M Petrak, S Ratcliff, BN Roodman, A Salnikov, AA Schindler, RH Schwiening, J Simi, G Snyder, A Soha, A Stelzer, J Su, D Sullivan, MK Va'vra, J Wagner, SR Weaver, M Weinstein, AJR Wisniewski, WJ Wittgen, M Wright, DH Yarritu, AK Young, CC Burchat, PR Edwards, AJ Meyer, TI Petersen, BA Roat, C Ahmed, M Ahmed, S Alam, MS Ernst, JA Saeed, MA Saleem, M Wappler, FR Bugg, W Krishnamurthy, M Spanier, SM Eckmann, R Kim, H Ritchie, JL Satpathy, A Schwitters, RF Izen, JM Kitayama, I Lou, XC Ye, S Bianchi, F Bona, M Gallo, F Gamba, D Bosisio, L Cartaro, C Cossutti, F Della Ricca, G Dittongo, S Grancagnolo, S Lanceri, L Poropat, P Vitale, L Vuagnin, G Panvini, RS Banerjee, S Brown, CM Fortin, D Jackson, PD Kowalewski, R Roney, JM Sobie, RJ Back, JJ Harrison, PF Mohanty, GB Band, HR Chen, X Cheng, B Dasu, S Datta, M Eichenbaum, AM Flood, KT Graham, M Hollar, JJ Johnson, JR Kutter, PE Li, H Liu, R Mihalyi, A Pan, Y Prepost, R Tan, P von Wimmersperg-Toeller, JH Wu, J Wu, SL Yu, Z Greene, MG Neal, H CA BaBar Collaboration TI Time-integrated and time-dependent angular analyses of B -> J/psi K pi: A measurement of cos2 beta with no sign ambiguity from strong phases SO PHYSICAL REVIEW D LA English DT Article ID DECAY AMPLITUDES; DISCRETE AMBIGUITIES; BRANCHING FRACTIONS; K-ASTERISK; B DECAYS; DISTRIBUTIONS; ASYMMETRIES; SCATTERING; PHYSICS AB We present results on B-->J/psiKpi decays using e(+)e(-)annihilation data collected with the BABAR detector at the Y(4S) resonance. The detector is located at the PEP-II asymmetric-energy storage ring facility at the Stanford Linear Accelerator Center. Using approximately 88x10(6) B (B) over bar pairs, we measure the decay amplitudes for the flavor eigenmodes and observe strong-phase differences indicative of final-state interactions with a significance of 7.6 standard deviations. We use the interference between the Kpi S-wave and P-wave amplitudes in the region of the K-*(892) to resolve the ambiguity in the determination of these strong phases. We then perform an ambiguity-free measurement of cos2beta using the angular and time-dependent asymmetry in B-->J/psiK(*0)(K(S)(0)pi(0)) decays. With sin2beta fixed at its measured value and cos2beta treated as an independent parameter, we find cos2beta=2.72(-0.79)(+0.50)(stat)+/-0.27(syst), determining the sign of cos2beta to be positive at 86% C.L. C1 Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. Univ Bari, Dipartimento Fis, I-70126 Bari, Italy. Ist Nazl Fis Nucl, I-70126 Bari, Italy. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Bergen, Inst Phys, N-5007 Bergen, Norway. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany. Univ Bristol, Bristol BS8 1TL, Avon, England. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada. Brunel Univ, Uxbridge UB8 3PH, Middx, England. Budker Inst Nucl Phys, Novosibirsk 630090, Russia. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. CALTECH, Pasadena, CA 91125 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. Univ Colorado, Boulder, CO 80309 USA. Colorado State Univ, Ft Collins, CO 80523 USA. Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany. Ecole Polytech, LLR, F-91128 Palaiseau, France. Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, I-44100 Ferrara, Italy. Florida A&M Univ, Tallahassee, FL 32307 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy. Ist Nazl Fis Nucl, I-16146 Genoa, Italy. Harvard Univ, Cambridge, MA 02138 USA. Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany. Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. Univ Iowa, Iowa City, IA 52242 USA. Iowa State Univ, Ames, IA 50011 USA. Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy. Ist Nazl Fis Nucl, I-06100 Perugia, Italy. Accelerateur Lineaire Lab, F-91898 Orsay, France. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Liverpool, Liverpool L69 72E, Merseyside, England. Queen Mary Univ London, London E1 4NS, England. Univ London Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England. Univ Louisville, Louisville, KY 40292 USA. Univ Manchester, Manchester M13 9PL, Lancs, England. Univ Maryland, College Pk, MD 20742 USA. Univ Massachusetts, Amherst, MA 01003 USA. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. McGill Univ, Montreal, PQ H3A 2T8, Canada. Univ Milan, Dipartimento Fis, I-20133 Milan, Italy. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Univ Mississippi, University, MS 38677 USA. Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada. Mt Holyoke Coll, S Hadley, MA 01075 USA. Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy. Ist Nazl Fis Nucl, I-80126 Naples, Italy. NIKHEF H, Natl Inst Nucl & High Energy Phys, NL-1009 DB Amsterdam, Netherlands. Univ Notre Dame, Notre Dame, IN 46556 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oregon, Eugene, OR 97403 USA. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Paris 06, F-75252 Paris, France. Univ Paris 07, Lab Phys Nucl & Hautes Energies, F-75252 Paris, France. Univ Pavia, Dipartimento Elettron, I-27100 Pavia, Italy. Ist Nazl Fis Nucl, I-27100 Pavia, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Dipartimento Fis, Scuola Normale Super Pisa, I-56127 Pisa, Italy. Ist Nazl Fis Nucl, I-56127 Pisa, Italy. Prairie View A&M Univ, Prairie View, TX 77446 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, I-00185 Rome, Italy. Princeton Univ, Princeton, NJ 08544 USA. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Univ Rostock, D-18051 Rostock, Germany. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. CEA Saclay, DSM Dapnia, F-91191 Gif Sur Yvette, France. Univ S Carolina, Columbia, SC 29208 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Stanford Univ, Stanford, CA 94305 USA. SUNY Albany, Albany, NY 12222 USA. Univ Tennessee, Knoxville, TN 37996 USA. Univ Texas, Austin, TX 78712 USA. Univ Texas, Richardson, TX 75083 USA. Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Vanderbilt Univ, Nashville, TN 37235 USA. Univ Victoria, Victoria, BC V8W 3P6, Canada. Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. Univ Basilicata, I-85100 Potenza, Italy. Univ Valencia, CSIC, Inst Fis Corpuscular, IFIC, Valencia, Spain. RP Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France. RI Saeed, Mohammad Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Monge, Maria Roberta/G-9127-2012; Luppi, Eleonora/A-4902-2015; Rotondo, Marcello/I-6043-2012; Neri, Nicola/G-3991-2012; Sarti, Alessio/I-2833-2012; Bellini, Fabio/D-1055-2009; de Groot, Nicolo/A-2675-2009; Lista, Luca/C-5719-2008; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Forti, Francesco/H-3035-2011; Patrignani, Claudia/C-5223-2009; de Sangro, Riccardo/J-2901-2012; M, Saleem/B-9137-2013; Cavallo, Nicola/F-8913-2012; Grancagnolo, Sergio/J-3957-2015; Mir, Lluisa-Maria/G-7212-2015; Kravchenko, Evgeniy/F-5457-2015; Pappagallo, Marco/R-3305-2016; Calcaterra, Alessandro/P-5260-2015; Frey, Raymond/E-2830-2016; Morandin, Mauro/A-3308-2016; Martinez Vidal, F*/L-7563-2014; Di Lodovico, Francesca/L-9109-2016; Peters, Klaus/C-2728-2008; Lo Vetere, Maurizio/J-5049-2012; Della Ricca, Giuseppe/B-6826-2013; Calabrese, Roberto/G-4405-2015; Lusiani, Alberto/A-3329-2016; Kolomensky, Yury/I-3510-2015; Lusiani, Alberto/N-2976-2015 OI Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini, Matteo/0000-0003-0101-6963; Monge, Maria Roberta/0000-0003-1633-3195; Luppi, Eleonora/0000-0002-1072-5633; Rotondo, Marcello/0000-0001-5704-6163; Neri, Nicola/0000-0002-6106-3756; Sarti, Alessio/0000-0001-5419-7951; Bellini, Fabio/0000-0002-2936-660X; Raven, Gerhard/0000-0002-2897-5323; Forti, Francesco/0000-0001-6535-7965; Patrignani, Claudia/0000-0002-5882-1747; de Sangro, Riccardo/0000-0002-3808-5455; FORD, WILLIAM/0000-0001-8703-6943; Carpinelli, Massimo/0000-0002-8205-930X; Sciacca, Crisostomo/0000-0002-8412-4072; Adye, Tim/0000-0003-0627-5059; Lafferty, George/0000-0003-0658-4919; Wilson, Robert/0000-0002-8184-4103; Strube, Jan/0000-0001-7470-9301; Grancagnolo, Sergio/0000-0001-8490-8304; Mir, Lluisa-Maria/0000-0002-4276-715X; Pappagallo, Marco/0000-0001-7601-5602; Calcaterra, Alessandro/0000-0003-2670-4826; Frey, Raymond/0000-0003-0341-2636; Morandin, Mauro/0000-0003-4708-4240; Martinez Vidal, F*/0000-0001-6841-6035; Di Lodovico, Francesca/0000-0003-3952-2175; Peters, Klaus/0000-0001-7133-0662; Lo Vetere, Maurizio/0000-0002-6520-4480; Della Ricca, Giuseppe/0000-0003-2831-6982; Calabrese, Roberto/0000-0002-1354-5400; Lusiani, Alberto/0000-0002-6876-3288; Kolomensky, Yury/0000-0001-8496-9975; Lusiani, Alberto/0000-0002-6876-3288 NR 43 TC 414 Z9 416 U1 7 U2 34 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 FEB PY 2005 VL 71 IS 3 AR 032005 DI 10.1103/PhysRevD.71.032005 PG 30 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400011 ER PT J AU Berger, EL Qiu, JW Wang, YL AF Berger, EL Qiu, JW Wang, YL TI Transverse momentum distribution of Upsilon production in hadronic collisions SO PHYSICAL REVIEW D LA English DT Article ID OCTET QUARKONIA PRODUCTION; HIGGS-BOSON PRODUCTION; TO-LEADING-ORDER; J-PSI PRODUCTION; INELASTIC PHOTOPRODUCTION; LOGARITHMIC CORRECTIONS; GLUON RESUMMATION; QCD; COLLIDERS; LHC AB We calculate the transverse momentum p(T) distribution for production of the Y states in hadronic reactions. For small p(T)(less than or equal toM(Y)), we resum to all orders in the strong coupling alpha(s) the process-independent large logarithmic contributions that arise from initial-state gluon showers. We demonstrate that the p(T) distribution at low p(T) is dominated by the region of small impact parameter b and that it may be computed reliably in perturbation theory. We express the cross section at large p(T) by the O(alpha(s)(3)) lowest-order nonvanishing perturbative contribution. Our results are consistent with data from the Fermilab Tevatron collider. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Kavli Inst Theoret Phys, Santa Barbara, CA USA. RP Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. EM berger@anl.gov; jwq@iastate.edu; yiliwa@iastate.edu NR 67 TC 37 Z9 37 U1 0 U2 2 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 FEB PY 2005 VL 71 IS 3 AR 034007 DI 10.1103/PhysRevD.71.034007 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400025 ER PT J AU Bern, Z Del Duca, V Dixon, LJ Kosower, DA AF Bern, Z Del Duca, V Dixon, LJ Kosower, DA TI All non-maximally-helicity-violating one-loop seven-gluon amplitudes in N=4 super-Yang-Mills theory SO PHYSICAL REVIEW D LA English DT Article ID GAUGE-THEORY AMPLITUDES; MULTI-GLUON SCATTERING; NUMERICAL EVALUATION; COLLINEAR LIMITS; FEYNMAN DIAGRAMS; PARTON PROCESSES; CROSS-SECTIONS; QCD AMPLITUDES; BREMSSTRAHLUNG; INTEGRALS AB We compute the non-MHV (non-maximally-helicity-violating) one-loop seven-gluon amplitudes in N=4 super-Yang-Mills theory, which contain three negative-helicity gluons and four positive-helicity gluons. There are four independent color-ordered amplitudes, (---++++), (--+-+++), (--++-++) and (-+-+-++). The MHV amplitudes containing two negative-helicity and five positive-helicity gluons were computed previously, so all independent one-loop seven-gluon helicity amplitudes are now known for this theory. We present partial information about an infinite sequence of next-to-MHV one-loop helicity amplitudes, with three negative-helicity and n-3 positive-helicity gluons, and the color ordering (---++...++); we give a new coefficient of one class of integral functions entering this amplitude. We discuss the twistor-space properties of the box-integral-function coefficients in the amplitudes, which are quite simple and suggestive. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Univ Durham, Dept Phys, Inst Particle Phys Phenomenol, Durham DH1 3LE, England. CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. RP Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. RI del duca, vittorio/F-6992-2012 NR 89 TC 125 Z9 125 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 FEB PY 2005 VL 71 IS 4 AR 045006 DI 10.1103/PhysRevD.71.045006 PG 27 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800068 ER PT J AU Cacciapaglia, G Csaki, C Grojean, C Terning, J AF Cacciapaglia, G Csaki, C Grojean, C Terning, J TI Curing the ills of Higgsless models: The S parameter and unitarity SO PHYSICAL REVIEW D LA English DT Article ID ELECTROWEAK SYMMETRY-BREAKING; LARGE MASS HIERARCHY; YANG-MILLS THEORY; STANDARD MODEL; TECHNICOLOR THEORIES; DIMENSIONS AB We consider various constraints on Higgsless models of electroweak symmetry breaking based on a bulk SU(2)(L)xSU(2)(R)xU(1)(B-L) gauge group in warped space. First we show that the S parameter which is positive if fermions are localized on the Planck brane can be lowered (or made vanishing) by changing the localization of the light fermions. If the wave function of the light fermions is almost flat their coupling to the gauge boson Kaluza-Klein (KK) modes will be close to vanishing, and therefore contributions to the S parameter will be suppressed. At the same time the experimental bounds on such Z(') and W-' gauge bosons become very weak, and their masses can be lowered to make sure that perturbative unitarity is not violated in this theory before reaching energies of several TeV. The biggest difficulty of these models is to incorporate a heavy top quark mass without violating any of the experimental bounds on bottom quark gauge couplings. In the simplest models of fermion masses a sufficiently heavy top quark also implies an unacceptably large correction to the Zb<(bover bar> vertex and a large splitting between the KK modes of the top and bottom quarks, yielding large loop corrections to the T parameter. We present possible directions for model building where perhaps these constraints could be obeyed as well. C1 Cornell Univ, Inst High Energy Phenomenol, Newman Lab Elementary Particle Phys, Ithaca, NY 14853 USA. CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA. Los Alamos Natl Lab, Theory Div T8, Los Alamos, NM 87545 USA. RP Cornell Univ, Inst High Energy Phenomenol, Newman Lab Elementary Particle Phys, Ithaca, NY 14853 USA. EM cacciapa@mail.lns.cornell.edu; csaki@lepp.cornell.edu; grojean@spht.saclay.cea.fr; terning@lanl.gov OI grojean, christophe/0000-0002-7196-7361; Terning, John/0000-0003-1367-0575 NR 60 TC 142 Z9 142 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 FEB PY 2005 VL 71 IS 3 AR 035015 DI 10.1103/PhysRevD.71.035015 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400068 ER PT J AU Chen, MC Mahanthappa, KT AF Chen, MC Mahanthappa, KT TI Relating leptogenesis to low energy flavor violating observables in models with spontaneous CP violation SO PHYSICAL REVIEW D LA English DT Article ID LEFT-RIGHT SYMMETRY; LEPTON NUMBER; NEUTRINO MASS; SO(10) MODELS; TRIPLET; BARYOGENESIS; PARITY; PHASES AB In the minimal left-right symmetric model, there are only two intrinsic CP violating phases to account for all CP violation in both the quark and lepton sectors, if CP is broken spontaneously by the complex phases in the VEV's of the scalar fields. In addition, the left- and right-handed Majorana mass terms for the neutrinos are proportional to each other due to the parity in the model. This is thus a very constrained framework, making the existence of correlations among the CP violation in leptogenesis, neutrino oscillation and neutrinoless double beta decay possible. In these models, CP violation in the leptonic sector and CP violation in the quark sector are also related. We find, however, that such connection is rather weak due to the large hierarchy in the bi-doublet VEV required by a realistic quark sector. C1 Brookhaven Natl Lab, Dept Phys, High Energy Theory Grp, Upton, NY 11973 USA. Univ Colorado, Dept Phys, Boulder, CO 80309 USA. Aspen Ctr Phys, Aspen, CO USA. RP Brookhaven Natl Lab, Dept Phys, High Energy Theory Grp, Upton, NY 11973 USA. EM chen@quark.phy.bnl.gov; ktm@pizero.colorado.edu NR 46 TC 28 Z9 28 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 3 AR 035001 DI 10.1103/PhysRevD.71.035001 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400054 ER PT J AU de Oliveira-Costa, A Tegmark, M Devlin, MJ Page, L Miller, AD Netterfield, CB Xu, YZ AF de Oliveira-Costa, A Tegmark, M Devlin, MJ Page, L Miller, AD Netterfield, CB Xu, YZ TI How accurately can suborbital experiments measure the CMB? SO PHYSICAL REVIEW D LA English DT Article ID MICROWAVE BACKGROUND ANISOTROPY; RADIOMETER 1ST-YEAR MAPS; PROBE WMAP OBSERVATIONS; ANGULAR POWER SPECTRUM; QMAP EXPERIMENT; DATA SETS; COBE DMR; SCALES; RADIATION; GHZ AB Great efforts are currently being channeled into ground- and balloon-based CMB experiments, mainly to explore polarization and anisotropy on small angular scales. To optimize instrumental design and assess experimental prospects, it is important to understand in detail the atmosphere-related systematic errors that limit the science achievable with new instruments. As a step in this direction, we spatially compare the 648 square degree ground- and balloon-based QMASK map with the atmosphere-free WMAP map, finding beautiful agreement on all angular scales where both are sensitive. Although much work remains on quantifying atmospheric effects on CMB experiments, this is a reassuring quantitative assessment of the power of the state-of-the-art fast-Fourier-transform- and matrix-based mapmaking techniques that have been used for QMASK and virtually all subsequent experiments. C1 MIT, Dept Phys, Cambridge, MA 02139 USA. Univ Penn, Dept Phys, Philadelphia, PA 19104 USA. Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. Columbia Univ, Dept Phys, New York, NY 10027 USA. Univ Toronto, Dept Phys & Astron, Toronto, ON M5S 1A7, Canada. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP MIT, Dept Phys, Cambridge, MA 02139 USA. EM angelica@hep.upenn.edu NR 39 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 4 AR 043004 DI 10.1103/PhysRevD.71.043004 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800007 ER PT J AU Ferrandis, J Pakvasa, S AF Ferrandis, J Pakvasa, S TI Quark-lepton complementarity relation and neutrino mass hierarchy SO PHYSICAL REVIEW D LA English DT Article ID SUPERSYMMETRIC STANDARD MODEL; DEGENERATE NEUTRINOS; CABIBBO ANGLE; RENORMALIZATION; MIXINGS; OSCILLATIONS; EQUATIONS; DOMINANCE; PATTERNS; PHASES AB Latest measurements have revealed that the deviation from a maximal solar mixing angle is approximately the Cabibbo angle [i.e., quark-lepton complementarity (QLC) relation]. We argue that it is not plausible that this deviation from maximality, be it a coincidence or not, comes from the charged lepton mixing. Consequently we have calculated the required corrections to the exactly bimaximal neutrino mass matrix ansatz necessary to account for the solar mass difference and the solar mixing angle. We point out that the relative size of these two corrections depends strongly on the hierarchy case under consideration. We find that the inverted hierarchy case with opposite CP parities, which is known to guarantee the renormalization group equations stability of the solar mixing angle, offers the most plausible scenario for a high-energy origin of a QLC-corrected bimaximal neutrino mass matrix. This possibility may allow us to explain the QLC relation in connection with the origin of the charged fermion mass matrices. C1 Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM ferrandis@mac.com; pakvasa@phys.hawaii.edu NR 60 TC 53 Z9 53 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 FEB PY 2005 VL 71 IS 3 AR 033004 DI 10.1103/PhysRevD.71.033004 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400016 ER PT J AU Goity, JL Schat, C Scoccola, NN AF Goity, JL Schat, C Scoccola, NN TI Decays of nonstrange negative parity baryons in the 1/N-c expansion SO PHYSICAL REVIEW D LA English DT Article ID LARGE-N-C; EXCITED BARYONS; MASS SPLITTINGS; QUARK-MODEL; QCD; BREAKING; SU(6)W AB The decays of nonstrange negative parity baryons via the emission of single pi and eta mesons are analyzed in the framework of the 1/N-c expansion. A basis of spin-flavor operators for the partial wave amplitudes is established to order 1/N-c and the unknown effective coefficients are determined by fitting to the S- and D-wave partial widths as provided by the Particle Data Group. A set of relations between widths that result at the leading order, i.e., order N-c(0), is given and tested with the available data. The rather large errors of the input partial widths, that result from the often discrepant results for the resonance parameters from different analyses of the data, lead to a rather good fit at the leading order N-c(0). The next to leading order fit fails for the same reason to pin down with satisfactory accuracy the subleading effective coefficients. The hierarchy expected from the 1/N-c expansion is however reflected in the results. C1 Hampton Univ, Dept Phys, Hampton, VA 23668 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Comis Nacl Energia Atom, Dept Phys, RA-1429 Buenos Aires, DF, Argentina. Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina. Univ Favaloro, RA-1078 Buenos Aires, DF, Argentina. RP Hampton Univ, Dept Phys, Hampton, VA 23668 USA. EM goity@jlab.org; schat@tandar.cnea.gov.ar; scoccola@tandar.cnea.gov.ar NR 39 TC 33 Z9 33 U1 0 U2 3 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 FEB PY 2005 VL 71 IS 3 AR 034016 DI 10.1103/PhysRevD.71.034016 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400034 ER PT J AU Grojean, C Servant, G Wells, JD AF Grojean, C Servant, G Wells, JD TI First-order electroweak phase transition in the standard model with a low cutoff SO PHYSICAL REVIEW D LA English DT Article ID WEINBERG-SALAM THEORY; HIGGS-BOSON MASS; BARYON ASYMMETRY; MIXING ANGLE; BARYOGENESIS; SPHALERONS; VIOLATION; POINT AB We study the possibility of a first-order electroweak phase transition due to a dimension-six operator in the effective Higgs potential. In contrast with previous attempts to make the electroweak phase transition strongly first-order as required by electroweak baryogenesis, we do not rely on large one-loop thermally generated cubic Higgs interactions. Instead, we augment the standard model effective theory with a dimension-six Higgs operator. This addition enables a strong first-order phase transition to develop even with a Higgs boson mass well above the current direct limit of 114 GeV. The phi(6) term can be generated for instance by strong dynamics at the TeV scale or by integrating out heavy particles like an additional singlet scalar field. We discuss conditions to comply with electroweak precision constraints, and point out how future experimental measurements of the Higgs self-couplings could test the idea. C1 CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. Univ Michigan, Dept Phys, MCTP, Ann Arbor, MI 48109 USA. Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60539 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. RP Grojean, C (reprint author), CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France. OI grojean, christophe/0000-0002-7196-7361 NR 34 TC 117 Z9 117 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 3 AR 036001 DI 10.1103/PhysRevD.71.036001 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400070 ER PT J AU Habib, S Heinen, A Heitmann, K Jungman, G AF Habib, S Heinen, A Heitmann, K Jungman, G TI Inflationary perturbations and precision cosmology SO PHYSICAL REVIEW D LA English DT Article ID ORDINARY DIFFERENTIAL-EQUATIONS; PROBE WMAP OBSERVATIONS; MICROWAVE BACKGROUND ANISOTROPIES; ANGULAR POWER SPECTRUM; DIGITAL SKY SURVEY; ASYMPTOTIC SOLUTIONS; DENSITY PERTURBATIONS; GRAVITATIONAL-WAVES; BESSEL-FUNCTIONS; UNIVERSE AB Inflationary cosmology provides a natural mechanism for the generation of primordial perturbations which seed the formation of observed cosmic structure and lead to specific signals of anisotropy in the cosmic microwave background radiation. In order to test the broad inflationary paradigm as well as particular models against precision observations, it is crucial to be able to make accurate predictions for the power spectrum of both scalar and tensor fluctuations. We present detailed calculations of these quantities utilizing direct numerical approaches as well as error-controlled uniform approximations, comparing with the (uncontrolled) traditional slow-roll approach. A simple extension of the leading-order uniform approximation yields results for the power spectra amplitudes, the spectral indices, and the running of spectral indices, with accuracy of the order of 0.1%-approximately the same level at which the transfer functions are known. Several representative examples are used to demonstrate these results. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany. RP Los Alamos Natl Lab, T-8, Los Alamos, NM 87545 USA. NR 77 TC 24 Z9 24 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 FEB PY 2005 VL 71 IS 4 AR 043518 DI 10.1103/PhysRevD.71.043518 PG 24 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800027 ER PT J AU Hill, CT Zachos, CK AF Hill, CT Zachos, CK TI Dimensional deconstruction and Wess-Zumino-Witten terms SO PHYSICAL REVIEW D LA English DT Article ID MASSIVE GAUGE-THEORIES AB A new technique is developed for the derivation of the Wess-Zumino-Witten (WZW) terms of gauged chiral Lagrangians. We start in D=5 with a pure (mesonless) Yang-Mills theory, which includes relevant gauge field Chern-Simons terms. The theory is then compactified, and the effective D=4 Lagrangian is derived using lattice techniques, or "deconstruction," where pseudoscalar mesons arise from the lattice Wilson links. This yields the WZW term with the correct Witten coefficient by way of a simple heuristic argument. We discover a novel WZW term for singlet currents, that yields the full Goldstone-Wilczek current, and a U(1) axial current for the Skyrmion, with the appropriate anomaly structures. A more detailed analysis is presented of the dimensional compactification of Yang-Mills in D=5 into a gauged chiral Lagrangian in D=4, heeding the consistency of the D=4 and D=5 Bianchi identities. These dictate a novel covariant derivative structure in the D=4 gauge theory, yielding a field strength modified by the addition of commutators of chiral currents. The Chern-Simons term of the pure D=5 Yang-Mills theory then devolves into the correct form of the Wess-Zumino-Witten term with an index (the analogue of N-colors=3) of N=D=5. The theory also has a Skyrme term with a fixed coefficient. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Hill, CT (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM hill@fnal.gov; zachos@anl.gov RI zachos, cosmas/C-4366-2014 OI zachos, cosmas/0000-0003-4379-3875 NR 20 TC 21 Z9 21 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 4 AR 046002 DI 10.1103/PhysRevD.71.046002 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800081 ER PT J AU Ishii, N Doi, T Iida, H Oka, M Okiharu, F Suganuma, H AF Ishii, N Doi, T Iida, H Oka, M Okiharu, F Suganuma, H TI Pentaquark baryon in anisotropic lattice QCD SO PHYSICAL REVIEW D LA English DT Article ID CONSTITUENT QUARK-MODEL; POSITIVE-STRANGENESS; THETA(+); RESONANCE; STATES; PHOTOPRODUCTION; SEARCH; PARITY; MASS AB The pentaquark (5Q) baryon is studied in anisotropic quenched lattice QCD with renormalized anisotropy a(s)/a(t)=4 for a high-precision mass measurement. The standard Wilson action at beta=5.75 and the O(a) improved Wilson quark action with kappa=0.1210(0.0010)0.1240 are employed on a 12(3)x96 lattice. Contribution of excited states is suppressed by using a smeared source. We investigate both the positive- and negative-parity 5Q baryons with I=0 and spin J=1/2 using a non-NK-type interpolating field. After chiral extrapolation, the lowest positive-parity state is found to have a mass, m(5Q)=2.25 GeV, which is much heavier than the experimentally observed Theta(+)(1540). The lowest negative-parity 5Q state appears at m(5Q)=1.75 GeV, which is near the s-wave NK threshold. To distinguish spatially-localized 5Q resonances from NK-scattering states, we propose a new general method imposing a "Hybrid Boundary Condition (HBC)," where the NK threshold is artificially raised without affecting compact five-quark states. The study using the HBC method shows that the negative-parity state observed on the lattice is not a compact 5Q state but an s-wave NK-scattering state. C1 Tokyo Inst Technol, Fac Sci, Dept Phys, Meguro Ku, Tokyo 1528551, Japan. Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. Nihon Univ, Fac Sci & Technol, Dept Phys, Chiyoda Ku, Tokyo 1018308, Japan. RP Tokyo Inst Technol, Fac Sci, Dept Phys, Meguro Ku, H-27, Tokyo 1528551, Japan. EM ishii@rarfaxp.riken.jp NR 76 TC 55 Z9 56 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 FEB PY 2005 VL 71 IS 3 AR 034001 DI 10.1103/PhysRevD.71.034001 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400019 ER PT J AU Kolb, EW Riotto, A Vallinotto, A AF Kolb, EW Riotto, A Vallinotto, A TI Curvature perturbations from broken symmetries SO PHYSICAL REVIEW D LA English DT Article ID INFLATIONARY UNIVERSE; COSMOLOGICAL PERTURBATIONS; FLUCTUATIONS AB We present a new general mechanism to generate curvature perturbations after the end of the slow-roll phase of inflation. Our model is based on the simple assumption that the potential driving inflation is characterized by an underlying global symmetry which is slightly broken. C1 Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA. Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA. Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy. Univ Chicago, Dept Phys, Chicago, IL 60637 USA. RP Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, POB 500, Batavia, IL 60510 USA. EM rocky@fnal.gov; antonio.riotto@pd.infn.it; avallino@uchicago.edu NR 25 TC 58 Z9 58 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 FEB PY 2005 VL 71 IS 4 AR 043513 DI 10.1103/PhysRevD.71.043513 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901ZC UT WOS:000227319800022 ER PT J AU Kryjevski, A Kaplan, DB Schafer, T AF Kryjevski, A Kaplan, DB Schafer, T TI New phases in color-flavor-locked quark matter SO PHYSICAL REVIEW D LA English DT Article ID HIGH-DENSITY QCD; CHIRAL-SYMMETRY BREAKING; LOCKING AB We consider O(alpha(s)) corrections to the squared masses of the pseudo-Goldstone excitations about the ground state of dense quark matter. We show that these contributions tend to destabilize the vacuum, leading to a surprisingly complex phase structure for quark matter as a function of quark mass, even for small alpha(s). In particular we find two new phases of CFL quark matter possibly relevant for the real world, for which (θ) over bar (QCD)=pi/2. C1 Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA. N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. Brookhaven Natl Lab, Riken BNL Res Ctr, Upton, NY 11793 USA. RP Kryjevski, A (reprint author), Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA. EM abk4@phys.washington.edu; dbkaplan@phys.washington.edu; thomas_schaefer@ncsu.edu NR 17 TC 21 Z9 22 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD FEB PY 2005 VL 71 IS 3 AR 034004 DI 10.1103/PhysRevD.71.034004 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400022 ER PT J AU Macesanu, C Nandi, S Rujoiu, M AF Macesanu, C Nandi, S Rujoiu, M TI Single Kaluza-Klein production in universal extra dimensions SO PHYSICAL REVIEW D LA English DT Article ID MILLIMETER; TEV AB In the universal extra-dimensions models, Kaluza-Klein excitations of matter are generaly produced in pairs. However, if matter lives on a fat brane embedded in a larger space, gravity-matter interactions do not obey KK number-conservation, thus making possible the production of single KK excitations at colliders. We evaluate the production rates for such excitations at the Tevatron and LHC colliders, and look for ways to detect them. C1 Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA. Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Inst Space Sci, Bucharest 76900, Romania. RP Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA. EM cmacesan@physics.syr.edu; shaown@okstate.edu; rujoiu@okstate.edu RI Rujoiu, Corneliu Marius/C-1023-2012 NR 18 TC 9 Z9 9 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 FEB PY 2005 VL 71 IS 3 AR 036003 DI 10.1103/PhysRevD.71.036003 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 901YY UT WOS:000227319400072 ER PT J AU Ben-Naim, E Krapivsky, PL AF Ben-Naim, E Krapivsky, PL TI Kinetic theory of random graphs: From paths to cycles SO PHYSICAL REVIEW E LA English DT Article ID LINEAR DIFFERENTIAL EQUATIONS; MOLECULAR-SIZE DISTRIBUTION; UNICYCLIC COMPONENTS; COMPLEX NETWORKS; INFINITE SET; AGGREGATION; COAGULATION; POLYMERS; GELATION; SYSTEMS AB The structural properties of evolving random graphs are investigated. Treating linking as a dynamic aggregation process, rate equations for the distribution of node to node distances (paths) and of cycles are formulated and solved analytically. At the gelation point, the typical length of paths and cycles, l, scales with the component size k as l similar to k(1/2). Dynamic and finite-size scaling laws for the behavior at and near the gelation point are obtained. Finite-size scaling laws are verified using numerical simulations. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. RP Ben-Naim, E (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Ben-Naim, Eli/C-7542-2009; Krapivsky, Pavel/A-4612-2014 OI Ben-Naim, Eli/0000-0002-2444-7304; NR 45 TC 21 Z9 21 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD FEB PY 2005 VL 71 IS 2 AR 026129 DI 10.1103/PhysRevE.71.026129 PN 2 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RV UT WOS:000228246200038 PM 15783400 ER PT J AU Chernyak, V Chertkov, M Jarzynski, C AF Chernyak, V Chertkov, M Jarzynski, C TI Dynamical generalization of nonequilibrium work relation SO PHYSICAL REVIEW E LA English DT Article ID FREE-ENERGY DIFFERENCES; FLUCTUATION THEOREM; STATISTICAL-MECHANICS; STOCHASTIC DYNAMICS; STEADY-STATES; EQUALITY; EQUILIBRIUM; SYSTEMS AB The evolution of systems in contact with thermal, chaotic, or turbulent surroundings-often modeled with stochastic equations of motion-can be particularly complex when these equations of motion are nonautonomous, that is, when external parameters of the surroundings are varied with time. In this paper we establish a rigorous equality relating the nonautonomous behavior of such a system, to solutions of the corresponding autonomous equations of motion, for arbitrary initial conditions. If the system is initially in thermal equilibrium, we recover previously known results relating nonequilibrium work values to equilibrium probability distributions. We discuss specific examples of our result, and suggest an experimental setting in which it might be verified. C1 Wayne State Univ, Dept Chem, Detroit, MI 48202 USA. Los Alamos Natl Lab, Div Theoret, CNLS, Los Alamos, NM 87545 USA. RP Chernyak, V (reprint author), Wayne State Univ, Dept Chem, 5101 Cass Ave, Detroit, MI 48202 USA. RI Jarzynski, Christopher/B-4490-2009; Chertkov, Michael/O-8828-2015; Chernyak, Vladimir/F-5842-2016 OI Jarzynski, Christopher/0000-0002-3464-2920; Chernyak, Vladimir/0000-0003-4389-4238 NR 25 TC 20 Z9 20 U1 0 U2 8 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 FEB PY 2005 VL 71 IS 2 AR 025102 DI 10.1103/PhysRevE.71.025102 PN 2 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RV UT WOS:000228246200002 PM 15783364 ER PT J AU Ferer, M Bromhal, GS Smith, DH AF Ferer, M Bromhal, GS Smith, DH TI Two-phase flow in porous media: Crossover from capillary fingering to compact invasion for drainage SO PHYSICAL REVIEW E LA English DT Article ID IMMISCIBLE DISPLACEMENT; PERCOLATION; SIMULATIONS; DYNAMICS; MODELS; INTERFACES; AVALANCHES; PRESSURE; FLUIDS; RATIO AB It had been predicted that the capillary fingering observed at small capillary numbers should change or cross over to compact invasion at larger capillary numbers or longer times [D. Wilkinson, Phys. Rev. A 34, 1380 (1986)]. We present results from pore-level modeling in two dimensions for the average position (related to the position of the interface) of the injected fluid as well as the width of the interface between the injected, nonwetting fluid and the defending, wetting fluid. These results are entirely consistent with the predicted crossover from the fractal flow characterized by invasion percolation with trapping (IPWT) to compact/linear/stable flow, where the position of the injected fluid advances linearly with time and where the width of the interface is constant. Furthermore, our results for the characteristic time, at which the crossover occurs, agree with the predictions of Wilkinson. To focus on the effect of capillary number, we are considering only viscosity-matched flows where both fluids have the same viscosities. To our knowledge, these are the first pore-level modeling results that quantitatively test the general predictions of Wilkinson for this capillary crossover in the case of drainage. Our modeling results are used to provide closed form expressions predicting the dependence of average position and interfacial width upon capillary number and time, regardless of the size of the system. The size scaling inherent in the crossover combined with our results locating the upper and lower bounds of the crossover regime enable us to predict the location of the crossover for two-dimensional systems of different size. These predictions are compared with flow patterns from experiments in the literature. The agreement between our predictions and the experimental flow patterns indicates that the experiments exhibit the same IPWT to compact crossover observed in our modeling. C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. RP Ferer, M (reprint author), W Virginia Univ, Dept Phys, POB 6315, Morgantown, WV 26506 USA. NR 43 TC 16 Z9 17 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1539-3755 J9 PHYS REV E JI Phys. Rev. E PD FEB PY 2005 VL 71 IS 2 AR 026303 DI 10.1103/PhysRevE.71.026303 PN 2 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RV UT WOS:000228246200053 ER PT J AU Gao, D Subramaniam, S Fox, RO Hoffman, DK AF Gao, D Subramaniam, S Fox, RO Hoffman, DK TI Objective decomposition of the stress tensor in granular flows SO PHYSICAL REVIEW E LA English DT Article ID ISOTROPIC FUNCTIONS; TURBULENCE AB A model for the stress tensor in granular flows [Volfson, Tsimring, and Aranson, Phys. Rev. Lett. 90, 254301 (2003)] is correctly generalized to an objective form that is independent of the coordinate system. The objective representation correctly models the isotropic and anisotropic parts of the stress tensor, whereas the original model for stress tensor components is dependent on the coordinate system. This general objective form of the model also relaxes the assumption in the original model that the principal axes of the granular stress tensor be coaxial with that of the "fluid" stress tensor. This generalization expands the applicability of the model to a wider class of granular flows. The objective representation is also useful in analyzing other models based on additive decomposition of the stress tensor in granular flows. C1 Iowa State Univ, Ames, IA 50010 USA. Ames Lab, Ames, IA 50010 USA. RP Subramaniam, S (reprint author), Iowa State Univ, Ames, IA 50010 USA. EM shankar@iastate.edu NR 16 TC 4 Z9 4 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD FEB PY 2005 VL 71 IS 2 AR 021302 DI 10.1103/PhysRevE.71.021302 PN 1 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RQ UT WOS:000228245700015 PM 15783319 ER PT J AU McGarrity, ES Duxbury, PM Holm, EA AF McGarrity, ES Duxbury, PM Holm, EA TI Statistical physics of grain-boundary engineering SO PHYSICAL REVIEW E LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; STRESS-CORROSION CRACKING; SURFACE FORMATION ENERGY; T-C SUPERCONDUCTORS; COMPUTER-SIMULATION; COATED CONDUCTORS; GRANULAR SUPERCONDUCTORS; INTERGRANULAR CRACKING; CHARACTER-DISTRIBUTION; PERCOLATION THEORY AB Percolation theory is now standard in the analysis of polycrystalline materials where the grain boundaries can be divided into two distinct classes, namely "good" boundaries that have favorable properties and "bad" boundaries that seriously degrade the material performance. Grain-boundary engineering (GBE) strives to improve material behavior by engineering the volume fraction c and arrangement of good grain boundaries. Two key percolative processes in GBE materials are the onset of percolation of a strongly connected aggregate of grains, and the onset of a connected path of weak grain boundaries. Using realistic polycrystalline microstructures, we find that in two dimensions the threshold for strong aggregate percolation c(SAP) and the threshold for weak boundary percolation c(WBP) are equivalent and have the value c(SAP)=c(WBP)=0.38(1), which is slightly higher than the threshold found for regular hexagonal grain structures, c(RH)=2 sin(pi/18)=0.347... . In three dimensions strong aggregate percolation and weak boundary percolation occur at different locations and we find c(SAP)=0.12(3) and c(WBP)=0.77(3). The critical current in high T-c materials and the cohesive energy in structural systems are related to the critical manifold problem in statistical physics. We develop a theory of critical manifolds in GBE materials, which has three distinct regimes: (i) low concentrations, where random manifold theory applies, (ii) critical concentrations where percolative scaling theory applies, and (iii) high concentrations, c>c(SAP), where the theory of periodic elastic media applies. Regime (iii) is perhaps most important practically and is characterized by a critical length L-c, which is the size of cleavage regions on the critical manifold. In the limit of high contrast epsilon -> 0, we find that in two dimensions L-c proportional to gc/(1-c), while in three dimensions L-c proportional to g exp[b(0)c/(1-c)]/[c(1-c)](1/2), where g is the average grain size, epsilon is the ratio of the bonding energy of the weak boundaries to that of the strong boundaries, and b(0) is a constant which is of order 1. Many of the properties of GBE materials can be related to L-c, which diverges algebraically on approach to c=1 in two dimensions, but diverges exponentially in that limit in three dimensions. We emphasize that GBE percolation processes and critical manifold behavior are very different in two dimensions as compared to three dimensions. For this reason, the use of two dimensional models to understand the behavior of bulk GBE materials can be misleading. C1 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48823 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48823 USA. EM mcgarrit@pa.msu.edu; duxbury@pa.msu.edu; eaholm@sandia.gov RI Holm, Elizabeth/S-2612-2016 OI Holm, Elizabeth/0000-0003-3064-5769 NR 66 TC 13 Z9 13 U1 0 U2 14 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 FEB PY 2005 VL 71 IS 2 AR 026102 DI 10.1103/PhysRevE.71.026102 PN 2 PG 15 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RV UT WOS:000228246200011 PM 15783373 ER PT J AU Zapperi, S Nukala, PKVV Simunovic, S AF Zapperi, S Nukala, PKVV Simunovic, S TI Crack roughness and avalanche precursors in the random fuse model SO PHYSICAL REVIEW E LA English DT Article ID FRACTURE SURFACES; HETEROGENEOUS MEDIA; WIDTH DISTRIBUTION; DISORDERED MEDIA; DRIVEN INTERFACES; CRITICAL-BEHAVIOR; CRITICAL-DYNAMICS; BURST AVALANCHES; BRITTLE-FRACTURE; BREAKDOWN AB We analyze the scaling of the crack roughness and of avalanche precursors in the two-dimensional random fuse model by numerical simulations, employing large system sizes and extensive sample averaging. We find that the crack roughness exhibits anomalous scaling, as recently observed in experiments. The roughness exponents (zeta,zeta(loc)) and the global width distributions are found to be universal with respect to the lattice geometry. Failure is preceded by avalanche precursors whose distribution follows a power law up to a cutoff size. While the characteristic avalanche size scales as s(0)similar to L-D, with a universal fractal dimension D, the distribution exponent tau differs slightly for triangular and diamond lattices and, in both cases, it is larger than the mean-field (fiber bundle) value tau=5/2. C1 Univ Roma La Sapienza, INFM UdR Roma 1, I-00185 Rome, Italy. Univ Roma La Sapienza, Dipartimento Fis, SMC, I-00185 Rome, Italy. Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. RP Univ Roma La Sapienza, INFM UdR Roma 1, Piazzale A Moro 2, I-00185 Rome, Italy. RI Zapperi, Stefano/C-9473-2009 OI Zapperi, Stefano/0000-0001-5692-5465 NR 65 TC 34 Z9 34 U1 0 U2 3 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 FEB PY 2005 VL 71 IS 2 AR 026106 DI 10.1103/PhysRevE.71.026106 PN 2 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA 914RV UT WOS:000228246200015 PM 15783377 ER PT J AU Delayen, JR AF Delayen, JR TI Cumulative beam breakup in linear accelerators with time-dependent parameters SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID INSTABILITIES; COLLIDERS; LINACS AB A formalism presented in a previous paper for the analysis of cumulative beam breakup (BBU) with arbitrary time dependence of the beam current and with misalignment of the cavities and focusing elements [J. R. Delayen, Phys. Rev. ST Accel. Beams 6, 084402 ( 2003)] is extended to include time dependence of the focusing and coupling between the beam and the dipole modes. Such time dependence, which could result from an energy chirp imposed on the beam or from rf focusing, is known to be effective in reducing BBU-induced instabilities and emittance growth. The analytical results are presented and applied to practical accelerator configurations and compared to numerical simulations. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Delayen, JR (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM delayen@jlab.org NR 31 TC 0 Z9 0 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 024402 DI 10.1103/PhysRevSTAB.8.024402 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600005 ER PT J AU Iriso, U Peggs, S AF Iriso, U Peggs, S TI Maps for electron clouds SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID DYNAMICS AB The electron cloud effect has been studied by means of detailed simulation codes that typically track the particles' evolution under the influence of the corresponding electromagnetic forces and fields. In this paper we show that, for the RHIC case, the electron cloud can be treated from an abstract point of view as a bunch to bunch evolution using simple maps. Secondly, we show how this treatment yields a useful conclusion, which is otherwise difficult to obtain: for a fixed number of bunches and total beam current in RHIC, it is possible to determine the best way to distribute the bunch pattern around the ring to minimize the electron cloud formation. This application is an example of how maps become a useful tool for exploring the electron cloud evolution in parameter space. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Iriso, U (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM ubaldo@bnl.gov; peggs@bnl.gov NR 21 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 024403 DI 10.1103/PhysRevSTAB.8.024403 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600006 ER PT J AU Nosochkov, Y Seryi, A AF Nosochkov, Y Seryi, A TI Compensation of detector solenoid effects on the beam size in a linear collider SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB In this paper, we discuss the optics effects of the realistic detector solenoid field on beam size at the interaction point (IP) of a future linear collider and their compensation. It is shown that most of the adverse effects on the IP beam size arise only from the part of the solenoid field which overlaps and extends beyond the final focusing quadrupoles. It is demonstrated that the most efficient and local compensation can be achieved using the novel method of weak antisolenoids near the IP, while a correction scheme which employs only skew quadrupoles is less efficient, and compensation with strong antisolenoids is not appropriate. One of the advantages of the proposed antisolenoid scheme is that this compensation works well over a large range of the beam energy. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Nosochkov, Y (reprint author), Stanford Linear Accelerator Ctr, POB 20450, Stanford, CA 94309 USA. NR 22 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 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 021001 DI 10.1103/PhysRevSTAB.8.021001 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600002 ER PT J AU Prost, LR Seidl, PA Bieniosek, FM Celata, CM Faltens, A Baca, D Henestroza, E Kwan, JW Leitner, M Waldron, WL Cohen, R Friedman, A Grote, D Lund, SM Molvik, AW Morse, E AF Prost, LR Seidl, PA Bieniosek, FM Celata, CM Faltens, A Baca, D Henestroza, E Kwan, JW Leitner, M Waldron, WL Cohen, R Friedman, A Grote, D Lund, SM Molvik, AW Morse, E TI High current transport experiment for heavy ion inertial fusion SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article ID IN-CELL SIMULATIONS; BEAM AB The High Current Experiment at Lawrence Berkeley National Laboratory is part of the U. S. program to explore heavy-ion beam transport at a scale representative of the low-energy end of an induction linac driver for fusion energy production. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge-dominated heavy-ion beams at high intensity ( line charge density similar to0.2 muC/m) over long pulse durations ( 4 mus) in alternating gradient focusing lattices of electrostatic or magnetic quadrupoles. This experiment is testing transport issues resulting from nonlinear space-charge effects and collective modes, beam centroid alignment and steering, envelope matching, image charges and focusing field nonlinearities, halo, and electron and gas cloud effects. We present the results for a coasting 1 MeV K+ ion beam transported through ten electrostatic quadrupoles. The measurements cover two different fill factor studies (60% and 80% of the clear aperture radius) for which the transverse phase space of the beam was characterized in detail, along with beam energy measurements and the first halo measurements. Electrostatic quadrupole transport at high beam fill factor ( approximate to 80%) is achieved with acceptable emittance growth and beam loss, even though the initial beam distribution is not ideal ( but the emittance is low) nor in thermal equilibrium. We achieved good envelope control, and rematching may only be needed every ten lattice periods ( at 80% fill factor) in a longer lattice of similar design. We also show that understanding and controlling the time dependence of the envelope parameters is critical to achieving high fill factors, notably because of the injector and matching section dynamics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Prost, LR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 63 TC 30 Z9 30 U1 0 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 020101 DI 10.1103/PhysRevSTAB.8.020101 PG 26 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600001 ER PT J AU Tomas, R AF Tomas, R TI Adiabaticity of the ramping process of an ac dipole SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB ac dipoles in accelerators are used to excite coherent betatron oscillations at a drive frequency close to the tune. If the excitation amplitude is slowly increased to the desired value and slowly decreased back to zero there is no significant emittance growth. The aim of this article is to study the adiabaticity of the ramping process of an ac dipole as a function of the different parameters involved. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tomas, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 14 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 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 024401 DI 10.1103/PhysRevSTAB.8.024401 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600004 ER PT J AU Tomas, R Bai, M Calaga, R Fischer, W Franchi, A Rumolo, G AF Tomas, R Bai, M Calaga, R Fischer, W Franchi, A Rumolo, G TI Measurement of global and local resonance terms SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS LA English DT Article AB Recently, resonance driving terms were successfully measured in the CERN SPS and the BNL RHIC from the Fourier spectrum of beam position monitor (BPM) data. Based on these measurements a new analysis has been derived to extract truly local observables from BPM data. These local observables are called local resonance terms since they share some similarities with the global resonance terms. In this paper we derive these local terms analytically and present experimental measurements of sextupolar global and local resonance terms in RHIC. Nondestructive measurements of these terms using ac dipoles are also presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. GSI Darmstadt, D-64291 Darmstadt, Germany. RP Tomas, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-4402 J9 PHYS REV SPEC TOP-AC JI Phys. Rev. Spec. Top.-Accel. Beams PD FEB PY 2005 VL 8 IS 2 AR 024001 DI 10.1103/PhysRevSTAB.8.024001 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 902HD UT WOS:000227344600003 ER PT J AU Ashurst, WT Kerstein, AR AF Ashurst, WT Kerstein, AR TI One-dimensional turbulence: Variable-density formulation and application to mixing layers SO PHYSICS OF FLUIDS LA English DT Article ID SHEAR-LAYER; MODEL FORMULATION; DIRECT SIMULATION; GROWTH-RATE; FLAMES; ENTRAINMENT; COMBUSTION; CONVECTION; INTERFACES; TRANSPORT AB One-dimensional turbulence (ODT), a method for one-dimensional stochastic simulation of turbulent flow, is generalized to incorporate variable-density effects. This formulation is used to investigate variable-density effects in planar mixing layers. Computed results are compared to direct numerical simulations of temporally developing mixing layers and to measurements performed in spatially developing mixing layers. Dependencies of mean flow structure and fluctuation statistics on the free-stream density ratio s are examined, including s values beyond the range of previous experimental and computational studies. For temporally developing mixing layers, the previously noted decrease of the layer growth rate as s deviates from unity is reproduced. For spatially developing mixing layers, dependence on s is sensitive to whether the high-speed or the low-speed stream is denser; by convention, the latter case corresponds to s>1. Experimental results indicating that layer growth is an increasing function of s have previously been interpreted on the basis of models that imply the continuation of this monotonic trend for all s. ODT reproduces the observed trend within the experimentally accessible range, but predicts a reversal of the trend slightly beyond that range and a subsequent decrease of the growth rate as s increases. This and related results suggest a closer analogy between the behaviors of temporally and spatially developing mixing layers than has previously been recognized. An experimental test of the predicted trend reversal in spatially developing mixing layers is proposed. (C) 2005 American Institute of Physics. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. RP Ashurst, WT (reprint author), Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. NR 50 TC 27 Z9 28 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 2005 VL 17 IS 2 AR 025107 DI 10.1063/1.1847413 PG 26 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 891PK UT WOS:000226592800021 ER PT J AU Jin, H Liu, XF Lu, T Cheng, B Glimm, J Sharp, DH AF Jin, H Liu, XF Lu, T Cheng, B Glimm, J Sharp, DH TI Rayleigh-Taylor mixing rates for compressible flow SO PHYSICS OF FLUIDS LA English DT Article ID BUBBLE MERGER MODEL; NUMERICAL-SIMULATION; INSTABILITY; DEPENDENCE; FLUIDS; ACCELERATION AB We study Rayleigh-Taylor instability in both the moderately compressible and weakly compressible regimes. For the two-dimensional single mode case, we find that the dimensionless terminal velocities (and associated Froude numbers) are nearly constant over most of this region of parameter space, as the thermodynamic parameters describing the equation of state are varied. The phenomenological drag coefficient which occurs in the single mode buoyancy-drag equation is directly related to the terminal velocities and has a similar behavior. Pressure differences and interface shape, however, display significant dependence on the equation of state parameters even for the weakly compressible flows. For three-dimensional multimode mixing, we expect accordingly that density stratification rather than drag will provide the leading compressibility effect. We develop an analytical model to account for density stratification effects in multimode self-similar mixing. Our theory is consistent with and extends numerically based conclusions developed earlier which also identify density stratification as the dominant compressibility effect for multimode three-dimensional mixing. (C) 2005 American Institute of Physics. C1 SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA. Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA. Brookhaven Natl Lab, Ctr Data Intens Comp, Upton, NY 11793 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Jin, H (reprint author), SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA. NR 34 TC 9 Z9 9 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 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 2005 VL 17 IS 2 AR 024104 DI 10.1103/1.1843155 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA 891PK UT WOS:000226592800014 ER PT J AU Kaufman, AN Tracy, ER Brizard, AJ AF Kaufman, AN Tracy, ER Brizard, AJ TI Helical rays in two-dimensional resonant wave conversion SO PHYSICS OF PLASMAS LA English DT Article ID LINEAR-MODE CONVERSION; ONE-DIMENSION AB The process of resonant wave conversion (often called linear mode conversion) has traditionally been analyzed with a spatially one-dimensional slab model, for which the rays propagate in a two-dimensional phase space. However, it has recently been shown [E. R. Tracy and A. N. Kaufman, Phys. Rev. Lett. 91, 130402 (2003)] that multidimensional rays have a helical structure for conversion in two or more spatial dimensions (if their dispersion matrix is generic). In that case, a one-dimensional model is inadequate; a correct analysis requires two spatial dimensions and, thus, four-dimensional phase space. A cold-plasma model is introduced in this paper which exhibits ray helicity in conversion regions where the density and magnetic field gradients are significantly nonparallel. For illustration, such regions are identified in a model of the poloidal plane of a deuterium-tritium tokamak plasma. In each conversion region, characterized by a six-sector topology, rays in the sector for incident and reflected magnetosonic waves exhibit significant helicity. A detailed analytic and numerical study of helical rays in this sector is developed for a "symmetric-wedge" model. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA. St Michaels Coll, Dept Chem & Phys, Colchester, VT 05439 USA. RP Kaufman, AN (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 13 TC 6 Z9 6 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD FEB PY 2005 VL 12 IS 2 AR 022101 DI 10.1063/1.1835980 PG 10 WC Physics, Fluids & Plasmas SC Physics GA 895RQ UT WOS:000226881100002 ER PT J AU Kolesnichenko, YI Marchenko, VS White, RB AF Kolesnichenko, YI Marchenko, VS White, RB TI Stabilization of sawtooth oscillations by the circulating energetic ions SO PHYSICS OF PLASMAS LA English DT Article ID INTERNAL KINK MODES; SPHERICAL TORI; PARTICLES; SAWTEETH; JET AB The influence of the well-circulating energetic ions on the ideal kink instability and the m=1 tearing instabilities (collisionless and semicollisional modes) is studied. It is found that the precession of these ions can be by an important stabilizing factor, especially when the balanced tangential neutral beam injection is used and/or in the presence of fusion-produced alpha particles. (C) 2005 American Institute of Physics. C1 Inst Nucl Res, UA-03680 Kiev, Ukraine. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Kolesnichenko, YI (reprint author), Inst Nucl Res, UA-03680 Kiev, Ukraine. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 20 TC 8 Z9 8 U1 1 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 FEB PY 2005 VL 12 IS 2 AR 022501 DI 10.1063/1.1839875 PG 4 WC Physics, Fluids & Plasmas SC Physics GA 895RQ UT WOS:000226881100019 ER PT J AU Sanford, TWL Nash, TJ Mock, RC Peterson, DL Watt, RG Chrien, RE Apruzese, JP Clark, RW Roderick, NF Sarkisov, GS Haines, MG AF Sanford, TWL Nash, TJ Mock, RC Peterson, DL Watt, RG Chrien, RE Apruzese, JP Clark, RW Roderick, NF Sarkisov, GS Haines, MG TI Evidence and mechanisms of axial-radiation asymmetry in dynamic hohlraums driven by wire-array Z pinches SO PHYSICS OF PLASMAS LA English DT Article ID X-RAY POWER; 2-DIMENSIONAL SIMULATIONS; Z-ACCELERATOR; NUMBER; INSTABILITIES; ENHANCEMENT; DIAGNOSTICS; FUSION; LINERS AB Dynamic hohlraums driven by arrays consisting of large numbers of tungsten wires in Z pinches exhibit differences in radiation emitted from REHs (radiation exit holes) symmetrically located at either end of the hohlraum [Sanford , Phys. Plasmas 10, 1187 (2003)]. Significantly greater peak power is radiated from the top (anode) REH relative to the bottom (cathode) REH. Spectral measurements of tungsten M-shell emission (2-2.4 keV) indicate the peak radiated power from either REH anticorrelates with the fraction of wire-array tungsten plasma inferred to sweep across (or into the field of view of) the REH near the time of peak axial emission. In all cases, greater M-shell emission relative to the total emission in the band 1.4-4 keV is measured at the bottom REH in comparison to the top REH. The decrease in peak power radiated from the bottom REH relative to the top appears to be due, in part, to an increase in localized opacity arising from the presence of increased wire-array tungsten plasma near the bottom REH. The asymmetry in both peak axial power and pulse shape is largely removed by adding two thin annular pedestals extending 3 mm into the anode-cathode gap from either electrode, just radially outboard of the REHs. The pedestals are designed to prevent the radial flow of tungsten plasma from prematurely crossing the REHs. A polarity effect [Sarkisov , Phys. Rev. E 66, 046413(6) (2002)] during wire initiation may offer one possible explanation for the underlying cause of such a tungsten-related axial power asymmetry. (C) 2005 American Institute of Physics. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. USN, Res Lab, Washington, DC 20375 USA. Univ New Mexico, Albuquerque, NM 87131 USA. Ktech Corp Inc, Albuquerque, NM 87123 USA. Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England. RP Sanford, TWL (reprint author), Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 48 TC 3 Z9 3 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 FEB PY 2005 VL 12 IS 2 AR 022701 DI 10.1063/1.1850479 PG 15 WC Physics, Fluids & Plasmas SC Physics GA 895RQ UT WOS:000226881100025 ER PT J AU Wohlbier, JG Jin, S Sengele, S AF Wohlbier, JG Jin, S Sengele, S TI Eulerian calculations of wave breaking and multivalued solutions in a traveling wave tube SO PHYSICS OF PLASMAS LA English DT Article ID COLD-PLASMA; MULTIPHASE COMPUTATIONS; SCHRODINGER-EQUATION; ENTROPY SOLUTIONS; OSCILLATIONS; OPTICS AB The traveling wave tube is an electron beam device that works on a similar principle to the beam-plasma instability, where the background plasma is replaced by an electromagnetic waveguiding structure. The nonlinear evolution of the instability includes wave breaking and the formation of multivalued solutions, and conventionally these solutions have been computed using Lagrangian techniques. Recently, an Eulerian method for computing multivalued solutions was developed in the context of geometrical optics and has been applied to the klystron, a relative of the traveling wave tube. In this paper we apply the Eulerian technique to solve a traveling wave tube model and compare the results to a Lagrangian technique. The results are found to be in good qualitative agreement with small quantitative differences that are attributed to the numerical methods. (C) 2005 American Institute of Physics. C1 Los Alamos Natl Lab, ISR6, Los Alamos, NM 87545 USA. Univ Wisconsin, Dept Math, Madison, WI 53706 USA. Univ Wisconsin, Dept Elect & Comp Engn, Madison, WI 53706 USA. RP Wohlbier, JG (reprint author), Los Alamos Natl Lab, ISR6, Los Alamos, NM 87545 USA. RI Jin, Shi/F-1252-2011 NR 21 TC 5 Z9 5 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 FEB PY 2005 VL 12 IS 2 AR 023106 DI 10.1063/1.1851990 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 895RQ UT WOS:000226881100031 ER PT J AU Chung, DJH Everett, LL Kane, GL King, SF Lykken, J Wang, LT AF Chung, DJH Everett, LL Kane, GL King, SF Lykken, J Wang, LT TI The soft supersymmetry-breaking Lagrangian: theory and applications SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID ELECTRIC-DIPOLE MOMENT; ANOMALOUS MAGNETIC-MOMENT; NEUTRALINO DARK-MATTER; STRONG-CP-PROBLEM; LARGE TAN-BETA; ELECTROWEAK PHASE-TRANSITION; LOW-ENERGY SUPERSYMMETRY; D-TERM INFLATION; HEAVY MAJORANA NEUTRINOS; LEPTON-FLAVOR VIOLATION AB After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also discussed. Topics covered include models of supersymmetry breaking, phenomenological constraints from electroweak symmetry breaking, flavor/CP violation, collider searches, and cosmological constraints including dark matter and implications for baryogenesis and inflation. (C) 2004 Elsevier B.V. All rights reserved. C1 Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. CERN, Div TH, CH-1211 Geneva 23, Switzerland. Univ Florida, Dept Phys, Gainesville, FL 32611 USA. Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA. EM gkane@umich.edu NR 898 TC 306 Z9 306 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 EI 1873-6270 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD FEB PY 2005 VL 407 IS 1-3 BP 1 EP 203 DI 10.1016/j.physrep.2004.08.032 PG 203 WC Physics, Multidisciplinary SC Physics GA 900GV UT WOS:000227204300001 ER PT J AU Wilkinson, MK Mook, HA AF Wilkinson, MK Mook, HA TI Ralph Marks Moon Jr - Obituary SO PHYSICS TODAY LA English DT Biographical-Item C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Wilkinson, MK (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 1 TC 0 Z9 0 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD FEB PY 2005 VL 58 IS 2 BP 86 EP 87 DI 10.1063/1.1897534 PG 2 WC Physics, Multidisciplinary SC Physics GA 893CW UT WOS:000226697900025 ER PT J AU Steiner, H AF Steiner, H TI Emilio Segre: nuclear pioneer SO PHYSICS WORLD LA English DT Biographical-Item C1 Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Steiner, H (reprint author), Univ Calif Berkeley, Berkeley, CA 94720 USA. EM hmsteiner@lbl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8585 J9 PHYS WORLD JI Phys. World PD FEB PY 2005 VL 18 IS 2 BP 35 EP 39 PG 5 WC Physics, Multidisciplinary SC Physics GA 900XC UT WOS:000227246600033 ER PT J AU Scott, SA Davis, CM Steelman, KL Rowe, MW Guilderson, T AF Scott, SA Davis, CM Steelman, KL Rowe, MW Guilderson, T TI AMS dates from four late prehistoric period rock art sites in West Central Montana SO PLAINS ANTHROPOLOGIST LA English DT Article DE rock art; plasma-chemical extraction; radiocarbon dating; Foothills Abstract tradition; Eastern Columbia Plateau tradition ID SOUTHWESTERN TEXAS; PAINTINGS; C-14; AUSTRALIA; CARBON; CRUST; AGE AB In 2002 eight pigment samples were collected from three rock art sites in the Big Belt Mountains of west central Montana. Samples from Hellgate Gulch (24BW9), Avalanche Mouth (24BW19), and the Gates of the Mountains (24LC27) were dated using plasma-chemical extraction and accelerator mass spectrometry. The dates were statistically indistinguishable with ages of 1170 +/- 45, 1225 +/- 50, and 1280 +/- 50 B.P. When calibrated, these ages range from 650 to 990 cal A.D. This corresponds to the early Late Prehistoric period on the Northwestern Plains. An oxalate accretion sample overlying a painted area at another site, Big Log Gulch (24LC1707), provided a minimum age of 1440 +/- 45 BY for the rock art present at this site. The dated images at the four sites fit within the Foothills Abstract and Eastern Columbia Plateau rock art traditions. C1 US Forest Serv, USDA, Helena Natl Forest, Helena, MT 59602 USA. Univ Cent Arkansas, Dept Chem, Conway, AR 72035 USA. Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Scott, SA (reprint author), US Forest Serv, USDA, Helena Natl Forest, 2880 Skyway Dr, Helena, MT 59602 USA. EM sascott01@fs.fed.us; cmdavis@fs.fed.us; ksteel@uca.edu; rowe@mail.chem.tamu.edu; tguilderson@llnl.gov NR 49 TC 3 Z9 3 U1 1 U2 1 PU PLAINS ANTHROPOLOGICAL SOC PI LINCOLN PA 410 WEDGEWOOD DRIVE, LINCOLN, NE 68510 USA SN 0032-0447 J9 PLAINS ANTHROPOL JI Plains Anthropol. PD FEB PY 2005 VL 50 IS 193 BP 57 EP 71 PG 15 WC Anthropology SC Anthropology GA 928DV UT WOS:000229252200007 ER PT J AU Pinsker, RI Carter, MD Forest, CB Svidzinski, VA Chattopadhyay, PK AF Pinsker, RI Carter, MD Forest, CB Svidzinski, VA Chattopadhyay, PK TI Calculation of coupling to the electron Bernstein wave with a phased waveguide array SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID LOWER HYBRID FREQUENCY; CURRENT DRIVE; PLASMAS; RANGE; SLOW AB Conventional electron cyclotron heating using the O- and X-modes to carry energy from the plasma edge to the cyclotron resonance layer is not possible for high density, low magnetic field devices (RFPs and STs, for example), since these modes are evanescent in all but the very edge of the plasma. As an alternative, we consider coupling to the electron Bernstein wave (EBW) with a phased waveguide array, the mouth of which is inserted to the vicinity of the upper hybrid resonance at the edge of the plasma. The calculation of the waveguide reflection coefficient is similar to the lower hybrid coupling problem solved by Brambilla, but the character of the plasma surface admittance is quite different for the EBW from that for the lower hybrid wave. Two models for the surface admittance are compared. In the first, the lowest-order EBW is included in the calculation, while in the second, the cold plasma model (which does not have any mode corresponding to the EBW) with weak collisions is used. The surface admittances obtained in those two models for parameters relevant to coupling experiments performed in the Madison symmetric torus (MST) are compared, and found to agree closely, despite the very different physics in the models. A significant asymmetry with respect to the direction mutually perpendicular to the static magnetic field and the radial direction (the poloidal direction in tokamak geometry, the toroidal direction in the edge of the RFP) is found. This phenomenon is related to the well-known up/down asymmetry in fast wave launch in the ion cyclotron radio frequency and to the up/down asymmetry previously reported for the fast wave in the lower hybrid radio frequency. The effect is very strong in this situation due to the density gradientscale length being much shorter than the local wavelength (violation of WKB condition) in the coupling region. C1 Gen Atom Co, San Diego, CA 92186 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37931 USA. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. RP Pinsker, RI (reprint author), Gen Atom Co, POB 85608, San Diego, CA 92186 USA. NR 20 TC 4 Z9 4 U1 0 U2 0 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 FEB PY 2005 VL 47 IS 2 BP 335 EP 355 DI 10.1088/0741-3335/47/2/009 PG 21 WC Physics, Fluids & Plasmas SC Physics GA 901MW UT WOS:000227287600010 ER PT J AU Tang, WM Chan, VS AF Tang, WM Chan, VS TI Advances and challenges in computational plasma science SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Review ID GRADIENT-DRIVEN TURBULENCE; GYROKINETIC PARTICLE SIMULATION; FIELD-REVERSED CONFIGURATIONS; INTERNAL TRANSPORT BARRIER; TOROIDAL ALFVEN EIGENMODE; EXB VELOCITY SHEAR; MAGNETIC RECONNECTION; ION-CYCLOTRON; TOKAMAK PLASMAS; EDGE TURBULENCE AB Scientific simulation, which provides a natural bridge between theory and experiment, is an essential tool for understanding complex plasma behaviour. Recent advances in simulations of magnetically confined plasmas are reviewed in this paper, with illustrative examples, chosen from associated research areas such as microturbulence, magnetohydrodynamics and other topics. Progress has been stimulated, in particular, by the exponential growth of computer speed along with significant improvements in computer technology. The advances in both particle and fluid simulations of fine-scale turbulence and large-scale dynamics have produced increasingly good agreement between experimental observations and computational modelling. This was enabled by two key factors: (a) innovative advances in analytic and computational methods for developing reduced descriptions of physics phenomena spanning widely disparate temporal and spatial scales and (b) access to powerful new computational resources. Excellent progress has been made in developing codes for which computer run-time and problem-size scale well with the number of processors on massively parallel processors (MPPs). Examples include the effective usage of the full power of multi-teraflop (multi-trillion floating point computations per second) MPPs to produce three-dimensional, general geometry, nonlinear particle simulations that have accelerated advances in understanding the nature of turbulence self-regulation by zonal flows. These calculations, which typically utilized billions of particles for thousands of time-steps, would not have been possible without access to powerful present generation MPP computers and the associated diagnostic and visualization capabilities. In looking towards the future, the current results from advanced simulations provide great encouragement for being able to include increasingly realistic dynamics to enable deeper physics insights into plasmas in both natural and laboratory environments. This should produce the scientific excitement which will help to (a) stimulate enhanced cross-cutting collaborations with other fields and (b) attract the bright young talent needed for the future health of the field of plasma science. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Gen Atom Co, San Diego, CA 92138 USA. RP Tang, WM (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 119 TC 18 Z9 18 U1 4 U2 14 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 FEB PY 2005 VL 47 IS 2 BP R1 EP R34 DI 10.1088/0741-3335/47/2/R01 PG 34 WC Physics, Fluids & Plasmas SC Physics GA 901MW UT WOS:000227287600001 ER PT J AU Baiquan, D Allain, JP Peng, LL Wang, XY Zhi, C Yan, JC AF Baiquan, D Allain, JP Peng, LL Wang, XY Zhi, C Yan, JC TI Interaction of impurity (Li, Be, B and C) and hydrogen isotope pellet injection with reactor-relevant Plasmas SO PLASMA SCIENCE & TECHNOLOGY LA English DT Article DE ITER-FEAT; pellet ablation; core fueling; isotopic effects; HFS injection ID ABLATION; TOKAMAKS; LITHIUM; MODEL AB Based on the two-dimensional kinetic ablation theory of the hydrogen pellet ablation developed by Kuteev [B.V. Kuteev, Nuclear Fusion, 35 (1995) 431], an algorithm of erosion speed and ablation rate calculations for Li, Be, and B impurity pellets in reactor-relevant plasma has been derived. Results show compatibilities of lithium pellet injection used in alpha-particle diagnostics are positive in comparison with other solid impurity pellets (e.g. Be, B and C). Using the 2-D Kuteev lentil model, including kinetic effects, we find that currently existing pellet injection techniques will not meet core-fueling requirements for ITER-FEAT. A pressure as high as 254 MPa must be applied to a pellet accelerator with a 200 cm-long single-stage pneumatic gun, in order to accelerate a pellet with a radius tau(P)0 = 0.5 cm to a velocity of v(P)0, 24 x 10(5) cm/s penetrating 100 cm into the ITER plasma core. Comparisons of pellet velocity- and radius-dependent penetration depth between the Neutral Gas Shielding and the Kuteev's models are made. However, we find that the isotopic effects can lead to a 33% lower pellet speed for solid DT, compared to an identical H-2 pellet penetrating the same length in ITER-FEAT plasma, and our calculations show that HFS injection will much improve core fueling efficiency. C1 SW Inst Phys, Chengdu 610041, Peoples R China. Argonne Natl Lab, Argonne, IL 60439 USA. RP Baiquan, D (reprint author), SW Inst Phys, Chengdu 610041, Peoples R China. EM dengbq@swip.ac.com OI Allain, Jean Paul/0000-0003-1348-262X NR 19 TC 1 Z9 3 U1 1 U2 2 PU SCIENCE CHINA PRESS PI BEIJING PA 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA SN 1009-0630 J9 PLASMA SCI TECHNOL JI Plasma Sci. Technol. PD FEB PY 2005 VL 7 IS 1 BP 2615 EP 2622 DI 10.1088/1009-0630/7/1/003 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 896QU UT WOS:000226949400003 ER PT J AU Gillen, KT Bernstein, R Wilson, MH AF Gillen, KT Bernstein, R Wilson, MH TI Predicting and confirming the lifetime of o-rings SO POLYMER DEGRADATION AND STABILITY LA English DT Article DE compression stress-relaxation; sealing force; compression set; accelerated aging; butyl o-rings; lifetime predictions ID STRESS-RELAXATION; EXTRAPOLATION; COMPRESSION; ELASTOMERS; ARRHENIUS; RUBBERS; SEALS AB We derive an empirical method for estimating the equilibrium sealing force appropriate to o-rings under their application (e.g., squeezed) conditions. Another empirical approach allows us to estimate the equilibrium compression set for o-rings once they have been released from their compressed state. Comparing the two equilibrium values for three different butyl o-ring materials aged under both laboratory accelerated aging conditions and under long-term field aging conditions indicates an approximately linear relationship between equilibrium set and equilibrium sealing force. When the results are combined with modulus measurements, the approximate linearity is shown to be consistent with a 60-year-old theory derived by Tobolsky and co-workers. These results allow us to use similar to20-year field aging results to quantitatively confirm accelerated aging predictions derived in an earlier publication. In addition, we describe experiments that allow us to quantitatively estimate that the sealing force per unit sealing length must drop below similar to1 N/cm before seal leakage is indicated. Combining this result with the accelerated aging predictions allows us to make lifetime predictions versus aging temperature for the butyl o-rings. (C) 2004 Elsevier Ltd. All rights reserved. C1 Sandia Natl Labs, Organ Mat Dept, Albuquerque, NM 87185 USA. Natl Nucl Secur Adm, Kansas City Plant, Kansas City, MO 64141 USA. RP Gillen, KT (reprint author), Sandia Natl Labs, Organ Mat Dept, POB 5800, Albuquerque, NM 87185 USA. EM ktgille@sandia.gov NR 22 TC 32 Z9 34 U1 4 U2 28 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PD FEB PY 2005 VL 87 IS 2 BP 257 EP 270 DI 10.1016/j.polymdegradstab.2004.07.019 PG 14 WC Polymer Science SC Polymer Science GA 889FQ UT WOS:000226429300005 ER PT J AU Gillen, KT Bernstein, R Celina, M AF Gillen, KT Bernstein, R Celina, M TI Non-Arrhenius behavior for oxidative degradation of chlorosulfonated polyethylene materials SO POLYMER DEGRADATION AND STABILITY LA English DT Article DE aging; lifetime prediction; chlorosulfonated polyethylene rubber; arrhenius extrapolation; oxygen consumption ID TEMPERATURE; LIFETIME; EXTRAPOLATION; POLYMERS; RUBBER AB We have carried out oven aging studies on eight different commercial chlorosulfonated polyethylene cable jacket materials at temperatures ranging from 80degreesC to 150degreesC utilizing ultimate tensile elongation as the degradation parameter. For each material, the elongation results were time-temperature superposed at the lowest aging temperature. When the resulting empirical shift factors were tested for Arrhenius behavior, it was found that the eight materials were Arrhenius at similar to100degreesC and higher with very similar activation energies averaging similar to107 kJ/mol. Longer-term aging results at temperatures lower than 100degreesC for three of the materials provided evidence for curvature to lower activation energies. For one of these materials, we conducted oxidation rate measurements at six temperatures ranging from 37degreesC to 108degreesC. The results offered further evidence for a small drop in activation energy below 100degreesC. Chemical evidence supporting this change in activation energy was derived from analysis of the production rates of CO2 during oxidation. As the temperature was lowered, the amount of CO2 produced relative to the O-2 consumed dropped substantially, implying that the chemistry leading to CO2 becomes less important at lower temperatures. (C) 2004 Elsevier Ltd. All rights reserved. C1 Sandia Natl Labs, Organ Mat Dept, Albuquerque, NM 87185 USA. RP Gillen, KT (reprint author), Sandia Natl Labs, Organ Mat Dept, POB 5800,MS-1411, Albuquerque, NM 87185 USA. EM ktgille@sandia.gov NR 24 TC 44 Z9 46 U1 1 U2 15 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PD FEB PY 2005 VL 87 IS 2 BP 335 EP 346 DI 10.1016/j.polymdegradstab.2004.09.004 PG 12 WC Polymer Science SC Polymer Science GA 889FQ UT WOS:000226429300014 ER PT J AU Khalil, H Mahajan, D Rafailovich, M AF Khalil, H Mahajan, D Rafailovich, M TI Polymer-montmorillonite clay nanocomposites. Part 1: Complexation of montmorillonite clay with a vinyl monomer SO POLYMER INTERNATIONAL LA English DT Article DE montmorillonite; polymer; styrene; exchange ID LAYERED SILICATE NANOCOMPOSITES; INTERCALATION; ADSORPTION; MECHANISM; BENZENE; CATIONS AB An organo-clay complex was formed by the exchange reaction of a quaternary ammonium salt of a derivatized styrene monomer with Na+-montmorillonite clay. The binding of the derivatized styrene monomer with the montmorillonite clay was confirmed by FTIR and the diffused reflectance analysis. The increase of the d-spacing of the derivatized styrene-N+-montmorillonite clay complex to 1.47 nm, measured by X-ray diffraction, indicates that a monolayer of the monomer is adsorbed between adjacent montmorillonite layers. A molecular modeling of the monomer suggested a benzene ring tilted to the c-axis of the montmorillonite clay. The carbon content of the styrene-N+-montmorillonite clay of 11.02% suggested a complete surface coverage of the clay by the monomer and a surface coverage of 0.74 nm(2) per exchange site of the montmorillonite. (C) 2004 Society of Chemical Industry. C1 Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA. RP Khalil, H (reprint author), Natl Res Ctr, Dept Polymers & Pigments, Cairo, Egypt. EM hanakhali@bnl.gov NR 29 TC 14 Z9 15 U1 1 U2 4 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 0959-8103 J9 POLYM INT JI Polym. Int. PD FEB PY 2005 VL 54 IS 2 BP 423 EP 427 DI 10.1002/pi.1711 PG 5 WC Polymer Science SC Polymer Science GA 893PO UT WOS:000226731900028 ER PT J AU Khalil, H Mahajan, D Rafailovich, M AF Khalil, H Mahajan, D Rafailovich, M TI Complex formation of montmorillonite clay with polymers. Part 2: The use of montmorillonite clay-vinyl monomer complex as a comonomer in the copolymerization reaction of styrene-acrylonitrile monomers SO POLYMER INTERNATIONAL LA English DT Article DE montmorillonite; copolymer; styrene; acrylonitrile; nanocomposite; exchange ID LAYERED-SILICATE; EMULSION POLYMERIZATION; MECHANICAL-PROPERTIES; MELT INTERCALATION; NANOCOMPOSITES; HYBRID AB The bulk copolymerization of styrene-acrylonitrile monomers using styrene-N+-montmorillonite complex as a comonomer in the polymerization was studied. The X-ray diffraction (XRD) analysis showed that part of the styrene-N+-montmorillonite complex remained non-dispersed (immiscible) and the copolymer was excluded from the interlayer of the immiscible part of the clay. The successive chemical extraction process revealed that a reasonable amount of the styrene-acrylonitrile copolymer was directly attached to the styrene-N+-montmorillonite complex and enveloped the clay. Highly exfoliated clay lamella and nanospheres (3-5 nm) were observed by transmission electron microscopy (TEM). The montmorillonite clay assume two different morphologies, immiscible and exfoliated, on the basis of the XRD and TEM data. A simple method of calculation of the ratio of the exfoliated/immiscible amounts of the clay indicated that the amount of the styrene-N+-montmorillonite complex exfoliated into separate lamella was 40% (w/w) of the amount of the clay samples containing 2% of the (styrene-N+-montmorillonite complex) clay. This amount of exfoliated clay decreases with the increase of the concentration of the clay. The presence of the styrene-N+-montmorillonite clay in the copolymerization reaction had a minor effect on both the copolymer composition and the molecular weight. Modification of the clay with the derivatized styrene monomer can achieve a nanocomposite using a percentage no more than 4% (w/w) of complex in the copolymer. (C) 2004 Society of Chemical Industry. C1 Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA. SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA. RP Khalil, H (reprint author), Natl Res Ctr, Dept Polymers & Pigments, Cairo, Egypt. EM hanakhali@bnl.gov NR 27 TC 2 Z9 2 U1 1 U2 2 PU JOHN WILEY & SONS LTD PI CHICHESTER PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND SN 0959-8103 J9 POLYM INT JI Polym. Int. PD FEB PY 2005 VL 54 IS 2 BP 428 EP 436 DI 10.1002/pi.1710 PG 9 WC Polymer Science SC Polymer Science GA 893PO UT WOS:000226731900029 ER PT J AU Baumgartner, G Auer, AA Bernholdt, DE Bibireata, A Choppella, V Cociorva, D Gao, XY Harrison, RJ Hirata, S Krishnamoorthy, S Krishnan, S Lam, CC Lu, QD Nooijen, M Pitzer, RM Ramanujam, J Sadayappan, P Sibiryakov, A AF Baumgartner, G Auer, AA Bernholdt, DE Bibireata, A Choppella, V Cociorva, D Gao, XY Harrison, RJ Hirata, S Krishnamoorthy, S Krishnan, S Lam, CC Lu, QD Nooijen, M Pitzer, RM Ramanujam, J Sadayappan, P Sibiryakov, A TI Synthesis of high-performance parallel programs for a class of Ab Initio quantum chemistry models SO PROCEEDINGS OF THE IEEE LA English DT Article DE communication minimization; compiler optimization; data locality optimization; domain-specific languages; high-level programming languages; memory-constrained optimization; tensor contraction expressions ID DATA LOCALITY OPTIMIZATION; COUPLED-CLUSTER AB This paper provides an overview of a program synthesis system for a class of quantum chemistry computations. These computations are expressible as a set of tensor contractions and arise in electronic structure modeling. The input to the system is a a high-le vel specification of the computation, from which the system can synthesize high-performance parallel code tailored to the characteristics of the target architecture. Several components of the synthesis system are described, focusing on performance optimization issues that they address. C1 Louisiana State Univ, Dept Comp Sci, Baton Rouge, LA 70803 USA. Tech Univ Chemnitz, Inst Chem, D-09111 Chemnitz, Germany. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Ohio State Univ, Dept Comp Sci & Engn, Columbus, OH 43210 USA. Univ Florida, Quantum Theory Project, Gainesville, FL 32611 USA. Univ Waterloo, Dept Chem, Waterloo, ON N2L 6B4, Canada. Ohio State Univ, Dept Chem, Columbus, OH 43210 USA. Louisiana State Univ, Dept Elect & Comp Engn, Baton Rouge, LA 70803 USA. Microsoft Corp, Redmond, WA 98052 USA. RP Louisiana State Univ, Dept Comp Sci, Baton Rouge, LA 70803 USA. EM gb@csc.lsu.edu; alexander.auer@chemie.tu-chemnitz.de; bernholdtde@ornl.gov; bibireat@cse.ohio-state.edu; choppellav@ornl.gov; cociorva@cse.ohio-state.edu; gaox@cse.ohio-state.edu; harrisonrj@oml.gov; hirata@qtp.ufl.edu; krishnsr@cse.ohio-state.edu; krishrias@cse.ohio-state.edu; clam@cse.ohio-state.edu; luq@cse.ohio-state.edu; nooijen@uwaterloo.ca; pitzer.3@osu.edu; jxr@ece.lsu.edu; saday@cse.ohio-state.edu; sibiryak@cse.ohio-state.edu RI Auer, Alexander/G-6836-2012 NR 78 TC 56 Z9 56 U1 1 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9219 EI 1558-2256 J9 P IEEE JI Proc. IEEE PD FEB PY 2005 VL 93 IS 2 BP 276 EP 292 DI 10.1109/JPROC.2004.840311 PG 17 WC Engineering, Electrical & Electronic SC Engineering GA 890WR UT WOS:000226542300004 ER PT J AU Demmel, J Dongarra, J Eijkhout, V Fuentes, E Petitet, A Vuduc, R Whaley, RC Yelick, K AF Demmel, J Dongarra, J Eijkhout, V Fuentes, E Petitet, A Vuduc, R Whaley, RC Yelick, K TI Self-adapting linear algebra algorithms and software SO PROCEEDINGS OF THE IEEE LA English DT Article DE adaptive methods; Basic Linear Algebra Subprograms (BLAS); dense kernels; iterative methods; linear systems; matrix-matrix product; matrix-vector product; performance optimization; preconditioners; sparse kernels ID EXTENDED SET; LEVEL-3 BLAS; SUBPROGRAMS; IMPLEMENTATION; OPTIMIZATIONS; FRAMEWORK; SYSTEMS AB One of the main obstacles to the efficient solution of scientific problems is the problem of tuning software, both to the available architecture and to the user problem at hand. We describe approaches for-obtaining tuned high-performance kernals and for automatically choosing suitable algorithms. Specifically we describe the generation of dense and sparse Basic Linear Algebra Subprograms (BLAS) kernels, and the selection of linear solver algorithms. However the ideas presented here extend beyond these areas, which can be considered proof of concept. C1 Univ Calif Berkeley, Div Comp Sci, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. Univ Tennessee, Dept Comp Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. Rice Univ, Dept Comp Sci, Houston, TX USA. Univ Tennessee, Innovat Comp Lab, Knoxville, TN 37996 USA. Sun Microsyst, F-75016 Paris, France. Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. Florida State Univ, Dept Comp Sci, Tallahassee, FL 32306 USA. Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Div Comp Sci, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. EM demmel@cs.berkeley.edu; eijkhout@cs.utk.edu; efuentes@cs.utk.edu; antoine.petitet@sun.com; whaley@cs.fsu.edu; yelick@cs.berkeley.edu RI Whaley, R./G-4234-2011; Dongarra, Jack/E-3987-2014; OI Vuduc, Richard/0000-0003-2178-138X NR 79 TC 54 Z9 54 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9219 EI 1558-2256 J9 P IEEE JI Proc. IEEE PD FEB PY 2005 VL 93 IS 2 BP 293 EP 312 DI 10.1109/JPROC.2004.840848 PG 20 WC Engineering, Electrical & Electronic SC Engineering GA 890WR UT WOS:000226542300005 ER PT J AU Yandell, M Bailey, AM Misra, S Shu, SQ Wiel, C Evans-Holm, M Celniker, SE Rubin, GM AF Yandell, M Bailey, AM Misra, S Shu, SQ Wiel, C Evans-Holm, M Celniker, SE Rubin, GM TI A computational and experimental approach to validating annotations and gene predictions in the Drosophila melanogaster genome SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE gene number; validation; genome annotation ID VERIFICATION; MOUSE; MAP; DNA AB Five years after the completion of the sequence of the Drosophila melanogaster genome, the number of protein-coding genes it contains remains a matter of debate; the number of computational gene predictions greatly exceeds the number of validated gene annotations. We have assembled a collection of >10,000 gene predictions that do not overlap existing gene annotations and have developed a process for their validation that allows us to efficiently prioritize and experimentally validate predictions from various sources by sequencing RT-PCR products to confirm gene structures. Our data provide experimental evidence for 122 protein-coding genes. Our analyses suggest that the entire collection of predictions contains only approximate to700 additional protein-coding genes. Although we cannot rule out the discovery of genes with unusual features that make them refractory to existing methods, our results suggest that the D. melanogaster genome contains approximate to14,000 protein-coding genes. C1 Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Genome Sci, Berkeley, CA 94720 USA. RP Yandell, M (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, Room 539, Berkeley, CA 94720 USA. EM myandell@fruitfly.org OI Rubin, Gerald/0000-0001-8762-8703 FU NHGRI NIH HHS [R01 HG002673] NR 19 TC 25 Z9 25 U1 1 U2 3 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 FEB 1 PY 2005 VL 102 IS 5 BP 1566 EP 1571 DI 10.1073/pnas.0409421102 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 895QF UT WOS:000226877300057 PM 15668397 ER PT J AU Londer, YY Pokkuluri, PR Erickson, J Orshonsky, Y Schiffer, M AF Londer, YY Pokkuluri, PR Erickson, J Orshonsky, Y Schiffer, M TI Heterologous expression of hexaheme fragments of a multidomain cytochrome from Geobacter sulfurreducens representing a novel class of cytochromes c SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article DE Geobacter sulfurreducens; heterologous expression; multiheme cylochrome c ID DESULFOVIBRIO-VULGARIS HILDENBOROUGH; ESCHERICHIA-COLI; ELECTRON-TRANSFER; SHEWANELLA-ONEIDENSIS; GENES; OVERPRODUCTION; RESOLUTION; REDUCTION; BACTERIA; OXIDASE AB Multiheme cytochromes c are of great interest for researchers for a variety of reasons but difficult to obtain in quantities sufficient for the majority of studies. The genome of delta-proteobacterium Geobacter sulfurreducens contains more than a hundred genes coding for c-type cytochromes. Three of them represent a new class of multiheme cytochromes characterized by a mixed type of heme coordination and multidomain organization. We cloned and expressed in Escherichia coli three hexaheme fragments corresponding to two-domain fragments of one such protein containing 12 heme binding motifs and believed to consist of four triheme domains. Despite high sequence similarity among the fragments, expression levels varied significantly. Expression was optimized either by host strain variation or by reducing the rate of apoprotein synthesis. All three fragments were purified by cation exchange followed by gel filtration and were shown to contain six covalently attached hemes as confirmed by mass spectrometry. Their visible spectra are typical of c-type cytochromes. One of the fragments was crystallized and its preliminary X-ray structure shows two separate domains. (C) 2004 Elsevier Inc. All rights reserved. C1 Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA. RP Londer, YY (reprint author), Argonne Natl Lab, Biosci Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM londer@anl.gov NR 27 TC 21 Z9 21 U1 1 U2 10 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD FEB PY 2005 VL 39 IS 2 BP 254 EP 260 DI 10.1016/j.pep.2004.10.015 PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 889IP UT WOS:000226437000016 PM 15642477 ER PT J AU Pajon, A Ionides, J Diprose, J Fillon, J Fogh, R Ashton, AW Berman, H Boucher, W Cygler, M Deleury, E Esnouf, R Janin, J Kim, R Krimm, I Lawson, CL Oeuillet, E Poupon, A Raymond, S Stevens, T van Tilbeurgh, H Westbrook, J Wood, P Ulrich, E Vranken, W Li, XL Laue, E Stuart, DI Henrick, K AF Pajon, A Ionides, J Diprose, J Fillon, J Fogh, R Ashton, AW Berman, H Boucher, W Cygler, M Deleury, E Esnouf, R Janin, J Kim, R Krimm, I Lawson, CL Oeuillet, E Poupon, A Raymond, S Stevens, T van Tilbeurgh, H Westbrook, J Wood, P Ulrich, E Vranken, W Li, XL Laue, E Stuart, DI Henrick, K TI Design of a data model for developing laboratory information management and analysis systems for protein production SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article DE UML data model; protein production; database schema; LIMS ID MACROMOLECULAR STRUCTURE; STRUCTURAL PROTEOMICS; DATA-BANK; CRYSTALLOGRAPHY; STANDARDS; PROJECT; SUITE; FILE AB Data management has emerged as one of the central issues in the high-throughput processes of taking a protein target sequence through to a protein sample. To simplify this task, and following extensive consultation with the international structural genomics community, we describe here a model of the data related to protein production. The model is suitable for both large and small facilities for use in tracking samples, experiments, and results through the many procedures involved. The model is described in Unified Modeling Language (UML). In addition, we present relational database schemas derived from the UML. These relational schemas are already in use in a number of data management projects. (C) 2004Wiley-Liss,lnc. C1 EBI, EMBL Outstn, Macromol Struct Database, Cambridge CB10 1SD, England. Wellcome Trust Ctr Human Genet, Oxford Prot Prod Facil, Oxford, England. Univ Cambridge, Dept Biochem, Cambridge CB2 1QW, England. Daresbury Lab, Warrington, Cheshire, England. Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ USA. NRC, Biotechnol Res Inst, Montreal, PQ, Canada. CNRS, INRA Sophia Antipolis, Plateforme Transcriptome, Sophia Antipolis, France. LEBS, Equipe Genom Struct, Gif Sur Yvette, France. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Univ Lyon 1, Lab RMN Biomol, F-69365 Lyon, France. Univ Wisconsin, Dept Biochem, Madison, WI 53705 USA. RP Henrick, K (reprint author), EBI, EMBL Outstn, Macromol Struct Database, Wellcome Trust Genome Campus, Cambridge CB10 1SD, England. EM henrick@ebi.ac.uk RI Wood, Peter/B-8508-2008; Janin, Joel/I-2958-2012; Vranken, Wim/J-5051-2016; OI Wood, Peter/0000-0002-5239-2160; Vranken, Wim/0000-0001-7470-4324; Westbrook, John/0000-0002-6686-5475; Laue, Ernest/0000-0002-7476-4148; Pajon, Anne/0000-0002-0269-3440 FU Biotechnology and Biological Sciences Research Council [BB/C512110/1, BB/C512145/1] NR 44 TC 20 Z9 23 U1 2 U2 3 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD FEB 1 PY 2005 VL 58 IS 2 BP 278 EP 284 DI 10.1002/prot.20303 PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 886PZ UT WOS:000226242100004 PM 15562521 ER PT J AU Zachariah, MA Crooks, GE Holbrook, SR Brenner, SE AF Zachariah, MA Crooks, GE Holbrook, SR Brenner, SE TI A generalized affine gap model significantly improves protein sequence alignment accuracy SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article DE remote homology detection; alignment quality; insertion; deletion; low-similarity region; unaligned ID HIDDEN MARKOV-MODELS; ASTRAL COMPENDIUM; STRUCTURAL ALIGNMENTS; PROFILE ALIGNMENT; PSI-BLAST; DATABASE; SEARCH; REFINEMENTS; STATISTICS; PENALTIES AB Sequence alignment underpins common tasks in molecular biology, including genome annotation, molecular phylogenetics, and homology modeling. Fundamental to sequence alignment is the placement of gaps, which represent character insertions or deletions. We assessed the ability of a generalized affine gap cost model to reliably detect remote protein homology and to produce high-quality alignments. Generalized affine gap alignment with optimal gap parameters performed as well as the traditional affine gap model in remote homology detection. Evaluation of alignment quality showed that the generalized affine model aligns fewer residue pairs than the traditional affine model but achieves significantly higher per-residue accuracy. We conclude that generalized affine gap costs should be used when alignment accuracy carries more importance than aligned sequence length. (C) 2004 Wiley-Liss, Inc. C1 Univ Calif Berkeley, Dept Plant & Microbial Biol, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA USA. RP Brenner, SE (reprint author), Univ Calif Berkeley, Dept Plant & Microbial Biol, 461A Koshland Hall,Ste 3102, Berkeley, CA 94720 USA. EM brenner@compbio.berkeley.edu RI Crooks, Gavin/H-7111-2012; Brenner, Steven/A-8729-2008 OI Brenner, Steven/0000-0001-7559-6185 FU NHGRI NIH HHS [1 K22 HG00056] NR 43 TC 16 Z9 18 U1 0 U2 4 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD FEB 1 PY 2005 VL 58 IS 2 BP 329 EP 338 DI 10.1002/prot.20299 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 886PZ UT WOS:000226242100010 PM 15562515 ER PT J AU Das, D Oganesyan, N Yokota, H Pufan, R Kim, R Kim, SH AF Das, D Oganesyan, N Yokota, H Pufan, R Kim, R Kim, SH TI Crystal structure of the conserved hypothetical protein MPN330 (GI : 1674200) from Mycoplasma pneumoniae SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article ID ALIGNMENT; EXTENSION; SOFTWARE; SEQUENCE C1 Lawrence Berkeley Natl Lab, Berkeley Struct Genom Ctr, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Kim, SH (reprint author), Lawrence Berkeley Natl Lab, Berkeley Struct Genom Ctr, Phys Biosci Div, Berkeley, CA 94720 USA. EM shkim@cchem.berkeley.edu FU NIGMS NIH HHS [GM 62412] NR 20 TC 2 Z9 2 U1 0 U2 0 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-3585 J9 PROTEINS JI Proteins PD FEB 1 PY 2005 VL 58 IS 2 BP 504 EP 508 DI 10.1002/prot.20316 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 886PZ UT WOS:000226242100028 PM 15562512 ER PT J AU Qian, WJ Jacobs, JM Camp, DG Monroe, ME Moore, RJ Gritsenko, MA Calvano, SE Lowry, SF Xiao, WZ Moldawer, LL Davis, RW Tompkins, RG Smith, RD AF Qian, WJ Jacobs, JM Camp, DG Monroe, ME Moore, RJ Gritsenko, MA Calvano, SE Lowry, SF Xiao, WZ Moldawer, LL Davis, RW Tompkins, RG Smith, RD TI Comparative proteome analyses of human plasma following in vivo lipopolysaccharide administration using multidimensional separations coupled with tandem mass spectrometry SO PROTEOMICS LA English DT Article DE comparative analysis; human plasma; lipopolysaccharicle; liquid chromatography-tandem mass spectrometry ID GROWTH-FACTOR ACTIVATOR; CODED AFFINITY TAGS; LIQUID-CHROMATOGRAPHY; INFLAMMATORY RESPONSES; SERUM PROTEOME; YEAST PROTEOME; HUMAN BLOOD; PROTEINS; IDENTIFICATION; COMPLEX AB There is significant interest in characterization of the human plasma proteome due to its potential for providing biomarkers applicable to clinical diagnosis and treatment and for gaining a better understanding of human diseases. We describe here a strategy for comparative proteome analyses of human plasma, which is applicable to biomarker identifications for various disease states. Multidimensional liquid chromatography-mass spectrometry (LC-MS/MS) has been applied to make comparative proteome analyses of plasma samples from an individual prior to and 9 h after lipopolysaccharide (LPS) administration. Peptide peak areas and the number of peptide identifications for each protein were used to evaluate the reproducibility of LC-MS/MS and to compare relative changes in protein concentration between the samples following LPS treatment. A total of 804 distinct plasma proteins (not including immunoglobulins) were confidently identified with 32 proteins observed to be significantly increased in concentration following LPS administration, including several known inflammatory response or acute-phase mediators such as C-reactive protein, serum amyloid A and A2, LPS-binding protein, LPS-responsive and beige-like anchor protein, hepatocyte growth factor activator, and von Willebrand factor, and thus, constituting potential biomarkers for inflammatory response. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA. Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Surg, Newark, NJ 07103 USA. Stanford Univ, Sch Med, Stanford Genome Technol Ctr, Palo Alto, CA 94304 USA. Univ Florida, Coll Med, Dept Surg, Lab Inflammat Biol & Surg Sci, Gainesville, FL 32611 USA. Harvard Univ, Sch Med, Shriners Burn Ctr, Dept Surg, Boston, MA 02115 USA. Harvard Univ, Massachusetts Gen Hosp, Sch Med, Boston, MA 02115 USA. RP Smith, RD (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, POB 999,MSIN K8-98, Richland, WA 99352 USA. EM rds@pnl.gov RI Qian, Weijun/C-6167-2011; Smith, Richard/J-3664-2012; OI Smith, Richard/0000-0002-2381-2349; xiao, wenzhong/0000-0003-4944-6380 FU NCRR NIH HHS [P41 RR018522, RR-18522]; NIGMS NIH HHS [U54 GM-62119-02, U54 GM062119] NR 48 TC 97 Z9 101 U1 0 U2 7 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 1615-9853 J9 PROTEOMICS JI Proteomics PD FEB PY 2005 VL 5 IS 2 BP 572 EP 584 DI 10.1002/pmic.200400942 PG 13 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 898YM UT WOS:000227112100026 PM 15627965 ER PT J AU Brunger, AT AF Brunger, AT TI Structure and function of SNARE and SNARE-interacting proteins SO QUARTERLY REVIEWS OF BIOPHYSICS LA English DT Review ID SENSITIVE FUSION PROTEIN; N-TERMINAL DOMAIN; SYNAPTIC VESICLE EXOCYTOSIS; BOTULINUM NEUROTOXIN-B; ELECTRON-PARAMAGNETIC-RESONANCE; BLOCK NEUROTRANSMITTER RELEASE; DEPENDENT MEMBRANE-FUSION; HOMOTYPIC VACUOLE FUSION; TOXIN TYPE-A; CRYSTAL-STRUCTURE AB This review focuses on the so-called SNARE (soluble N-ethyl maleimide sensitive factor attachment protein receptor) proteins that are involved in exocytosis at the pre-synpatic plasma membrane. SNAREs play a role in docking and fusion of synaptic vesicles to the active zone, as well as in the Ca2+-triggering step itself, most likely in combination with the Ca2+ sensor synaptotagmin. Different SNARE domains are involved in different processes, such as regulation, docking, and fusion. SNAREs exhibit multiple configurational, conformational. and oliogomeric states. These different states allow SNAREs to inter-act with their matching SNARE partners, auxiliary proteins, or with other SNARE domains, often in a mutually exclusive fashion, SNARE core domains undergo progressive disorder to order transitions upon interactions with other proteins, culminating with the fully folded post-fusion (cis) SNARE complex. Physiological concentrations of neuronal SNAREs can juxtapose membranes, and promote fusion in vitro under certain conditions. However, significantly more work will be required to reconstitute an in vitro system that faithfully mimics the Ca2+-triggered fusion of a synaptic vesicle at the active zone. C1 Stanford Univ, Howard Hughes Med Inst, Stanford, CA 94305 USA. Stanford Univ, Dept Cellular & Mol Physiol, Stanford, CA 94305 USA. Stanford Univ, Med Ctr, Dept Neurol & Neurol Sci, Stanford, CA 94305 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA. RP Brunger, AT (reprint author), Stanford Univ, Howard Hughes Med Inst, Stanford, CA 94305 USA. EM brunger@stanford.edu OI Brunger, Axel/0000-0001-5121-2036 FU NIMH NIH HHS [1-R01-MH63105] NR 307 TC 139 Z9 141 U1 0 U2 28 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4211 USA SN 0033-5835 J9 Q REV BIOPHYS JI Q. Rev. Biophys. PD FEB PY 2005 VL 38 IS 1 BP 1 EP 47 DI 10.1017/S0033583505004051 PG 47 WC Biophysics SC Biophysics GA 025ZZ UT WOS:000236307800001 PM 16336742 ER PT J AU Holroyd, RA AF Holroyd, RA TI Electron attachment to C-60 in nonpolar solvents SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article DE fullerene C-60; electron attachment C-60(-) anion; pulse radiolysis; conductivity; n-hexane; cyclohexane; 2,2,4-trimethylpentane; tetramethylsilane ID PULSE-RADIOLYSIS; N-HEXANE; EXCESS ELECTRONS; MOBILITY; LIQUIDS; BUCKMINSTERFULLERENE; TEMPERATURE; CYCLOHEXANE; PRESSURE; CATIONS AB Rate constants for electron attachment to C-60 Were measured by pulse radiolysis in several nonpolar solvents. The rates for this highly exoergic reaction are fast, comparable to the rates found for the most efficient acceptors, such as SF6. The linear dependence of the rate on electron mobility for liquids in which the mobility is low, indicates the reaction is diffusion limited, but the rate drops below the diffusion rate for liquids in which the mobility is high. (C) 2004 Elsevier Ltd. All rights reserved. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Holroyd, RA (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM holroyd1@bnl.gov NR 31 TC 1 Z9 1 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0969-806X J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD FEB PY 2005 VL 72 IS 2-3 BP 79 EP 84 DI 10.1016/j.radphyschem.2004.09.002 PG 6 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA 882JB UT WOS:000225934100005 ER PT J AU Wishart, JF Lall-Ramnarine, SI Raju, R Scumpia, A Bellevue, S Ragbir, R Engel, R AF Wishart, JF Lall-Ramnarine, SI Raju, R Scumpia, A Bellevue, S Ragbir, R Engel, R TI Effects of functional group substitution on electron spectra and solvation dynamics in a family of ionic liquids SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article DE electron solvation; ionic liquid; alcohol ID PULSE-RADIOLYSIS; METHYLTRIBUTYLAMMONIUM BIS(TRIFLUOROMETHYLSULFONYL)IMIDE; REACTION-KINETICS; EXCESS ELECTRONS; ROOM-TEMPERATURE; SOLVENTS; ALCOHOLS; SALTS AB Ionic liquids containing ether-, alcohol- and alkyl-ftinctionalized quaternary ammonium dications were studied by pulse radiolysis. Spectra on nanosecond timescales revealed that solvation of the excess electron is particularly slow In the case of the alcohol-derivatized ionic liquids. The blue shift of the electron spectrum to the customary 650 nm peak takes 25-40ns at 21 degreesC. Comparison with the relaxation dynamics observed in viscous 1,2,6-trihydroxyhexane reveals the hindering effect of the ionic liquid lattice on hydroxypropyl side chain reorientation. (C) 2004 Elsevier Ltd. All rights reserved. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. CUNY Queens Coll, Grad Sch, Dept Chem & Biochem, Flushing, NY 11367 USA. RP Wishart, JF (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM wishart@bnil.gov RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 34 TC 61 Z9 62 U1 0 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0969-806X J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD FEB PY 2005 VL 72 IS 2-3 BP 99 EP 104 DI 10.1016/j.radphyschem.2004.09.005 PG 6 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA 882JB UT WOS:000225934100008 ER PT J AU LaVerne, JA Tandon, L Knippel, BC Montoya, VN AF LaVerne, JA Tandon, L Knippel, BC Montoya, VN TI Heavy ion radiolysis of methylene blue SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article DE methylene blue; dosimetry; heavy ions ID RADIATION-CHEMISTRY; AQUEOUS SOLUTIONS; FRICKE DOSIMETER; YIELD AB Radiation chemical yields for the bleaching of aerated aqueous solutions of methylene blue in the radiolysis with x-rays, protons and helium ions have been determined using absolute dosimetry techniques in order to promote this system as a chemical dosimeter with heavy ions. At low changes (<25%) in the initial absorption of 16muM solutions, the dose response is reasonably linear for the radiations examined here. Radiation chemical yields for the bleaching of methylene blue solutions at 292 nm and at low doses range from 0.71 +/- 0.04 with gamma-rays to 0.065 +/- 0.003 molecules, 100 eV for helium ions. The yields decrease with decreasing proton energy. but seem to he independent of incident energy with helium ions. The results suggest that the overall efficiency for the decomposition of methylene blue by OH radicals is not directly proportional to the energy deposition density of the heavy ion. (C) 2004 Elsevier Ltd. All rights reserved. C1 Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA. Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. RP LaVerne, JA (reprint author), Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA. EM laverne.1@nd.edu NR 14 TC 10 Z9 10 U1 3 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0969-806X J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD FEB PY 2005 VL 72 IS 2-3 BP 143 EP 147 DI 10.1016/j.radpyhschem.2004.09.010 PG 5 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA 882JB UT WOS:000225934100014 ER PT J AU Hahto, SK Hahto, ST Leung, KN Reijonen, J Miller, TG Van Staagen, PK AF Hahto, SK Hahto, ST Leung, KN Reijonen, J Miller, TG Van Staagen, PK TI Fast ion beam chopping system for neutron generators SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Fast deuterium (D+) and tritium (T+) ion beam pulses are needed in some neutron-based imaging systems. A compact, integrated fast ion beam extraction and chopping system has been developed and tested at the Lawrence Berkeley National Laboratory for these applications, and beam pulses with 15 ns full width at half maximum have been achieved. Computer simulations together with experimental tests indicate that even faster pulses are achievable by shortening the chopper voltage rise time. This chopper arrangement will be implemented in a coaxial neutron generator, in which a small point-like neutron source is created by multiple 120 keV D+ ion beams hitting a titanium target at the center of the source. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Tensor Technol Inc, Madison, AL USA. RP Hahto, SK (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM skhahto@lbl.gov NR 4 TC 8 Z9 8 U1 2 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 FEB PY 2005 VL 76 IS 2 AR 023304 DI 10.1063/1.1852871 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400019 ER PT J AU Haljasmaa, IV Vipperman, JS Lynn, RJ Warzinski, RP AF Haljasmaa, IV Vipperman, JS Lynn, RJ Warzinski, RP TI Control of a fluid particle under simulated deep-ocean conditions in a high-pressure water tunnel SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID BUBBLE; MOTION; FLOW AB An apparatus that permits the observation of liquid CO2 particles in a simulated deep-ocean environment was designed, modeled, constructed, and tested. Analysis concerning the vertical stability and control of the fluid particle in a countercurrent flow loop is presented. The vertical position of the particle was found to vary due to the gradual dissolution of the CO2 into the water and various other random effects. Using linearized equations for spherical particle motion in the fluid flow, a second-order dynamic equation is derived and analyzed. The servocontrol system consists of a video system that digitizes particle position in a viewing window and a centrifugal pump that can control the speed of the countercurrent flow in order to maintain the particle within the observation window of a charge-coupled device camera. Currently, the system is being used to obtain information on the dissolution behavior of CO2 in seawater at various conditions of pressure and temperature that simulate ocean depths down to 3400 m. This information can be used to predict the fate of CO2 drops in the ocean, whether released from natural seeps, leaks from suboceanic geologic CO2 storage sites, or from engineered deep-ocean injection systems. The study of other liquids and gases is also possible. (C) 2005 American Institute of Physics. C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15261 USA. RP Warzinski, RP (reprint author), US DOE, Natl Energy Technol Lab, POB 10940, Pittsburgh, PA 15236 USA. EM Robert.Warzinski@netl.doe.gov NR 15 TC 6 Z9 6 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 2005 VL 76 IS 2 AR 025111 DI 10.1063/1.1854216 PG 11 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400067 ER PT J AU Hu, YW Li, LH Xu, M Liu, YM Cai, X Brown, IG Chu, PK AF Hu, YW Li, LH Xu, M Liu, YM Cai, X Brown, IG Chu, PK TI Transport efficiency of vacuum arc plasma in a curved magnetic filter SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID CATHODIC ARC; THIN-FILMS; SPACE-CHARGE; DEPOSITION; FIELDS AB We describe two methods for increasing the transmission efficiency of vacuum arc plasma through curved magnetic filters. In the first method the substrate is connected to the anode or biased to a negative voltage. In the second method a metal grid is placed between the substrate and the exit of the magnetic filter, and biased to a positive voltage whereas the substrate is biased negatively. The ion saturation current and electron saturation current of the plasma between the filter exit and the substrate were measured using a current collector plate and a Langmuir probe, respectively, and the ion density estimated. For the experimental conditions of the work described here, the measured ion flux (ion saturation current) near the duct exit was increased by up to about 80% (from 140 to 250 mA), and the measured ion density was increased by up to about 40% (from 3.7x10(11) to 5.2x10(11) cm(-3)). These results can be explained by the ambipolar influence of enhanced electron flow on the accompanying plasma ion component, leading also to enhanced ion flow. (C) 2005 American Institute of Physics. C1 Shanghai Jiao Tong Univ, Sch Mat Sci & Technol, Shanghai 200240, Peoples R China. Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100083, Peoples R China. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China. RP Li, LH (reprint author), Shanghai Jiao Tong Univ, Sch Mat Sci & Technol, Huashan Rd, Shanghai 200240, Peoples R China. EM Liuhena@vip.sina.com RI Xu, Ming/A-1523-2012; Chu, Paul/B-5923-2013 OI Chu, Paul/0000-0002-5581-4883 NR 15 TC 3 Z9 3 U1 0 U2 7 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 FEB PY 2005 VL 76 IS 2 AR 023303 DI 10.1063/1.1848492 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400018 ER PT J AU Makowski, MA Allen, SL Ellis, R Geer, R Jayakumar, RJ Moller, JM Rice, BW AF Makowski, MA Allen, SL Ellis, R Geer, R Jayakumar, RJ Moller, JM Rice, BW TI Improved signal analysis for motional Stark effect data SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID DIII-D TOKAMAK; PROFILE MEASUREMENTS; POLARIMETRY; FIELD AB Nonideal effects in the optical train of the motional Stark effect diagnostic have been modeled using the Mueller matrix formalism. The effects examined are birefringence in the vacuum windows, an imperfect reflective mirror, and signal pollution due to the presence of a circularly polarized light component. Relations for the measured intensity ratio are developed for each case. These relations suggest fitting functions to more accurately model the calibration data. One particular function, termed the tangent offset model, is found to fit the data for all channels better than the currently used tangent slope function. Careful analysis of the calibration data with the fitting functions reveals that a nonideal effect is present in the edge array and is attributed to nonideal performance of a mirror in that system. The result of applying the fitting function to the analysis of our data has been to improve the equilibrium reconstruction. (C) 2005 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Magnet Fus Energy Program, Livermore, CA 94550 USA. Xenogen Corp, Alameda, CA 94501 USA. RP Makowski, MA (reprint author), Lawrence Livermore Natl Lab, Magnet Fus Energy Program, POB 805,L-637, Livermore, CA 94550 USA. EM makowski@fusion.gat.com NR 16 TC 3 Z9 3 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 2005 VL 76 IS 2 AR 023706 DI 10.1063/1.1848471 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400031 ER PT J AU Moran, MJ Glebov, VY Stoeckl, C Rygg, R Schwartz, BE AF Moran, MJ Glebov, VY Stoeckl, C Rygg, R Schwartz, BE TI PROTEX: A proton-recoil detector for inertial confinement fusion neutrons SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ENERGY AB Fusion neutron diagnostics are important to inertial confinement fusion (ICF) because they characterize fusion performance and help to provide the understanding that is needed to develop higher-yield sources. Present yields in excess of 10(12) deuterium-tritium (DT) neutrons now can be measured with a proton-recoil detector. This technique, which has not been practical with lower yields, is desirable because it provides prompt, accurate, and unambiguous results. The PROTEX is a proton-recoil detector which features a compact coaxial cylindrical geometry for maximum sensitivity, in situ simultaneous measurement of background signals, and an ab initio calculated absolute sensitivity. The calculated sensitivity has an estimated absolute accuracy of 6%. With simple adjustments, PROTEX can provide absolute measurement of yield for the National Ignition Facility, the Laser Megajoule Facility, or for any ICF source having a yield greater than 10(12) DT neutrons. (C) 2005 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Rochester, Laser Energet Lab, Rochester, NY 14627 USA. MIT, Cambridge, MA 02139 USA. RP Moran, MJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 12 TC 9 Z9 9 U1 1 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 FEB PY 2005 VL 76 IS 2 AR 023506 DI 10.1063/1.1854213 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400025 ER PT J AU Roy, PK Yu, SS Henestroza, E Eylon, S Shuman, DB Ludvig, J Bieniosek, FM Waldron, WL Greenway, WG Vanecek, DL Hannink, R Amezcua, M AF Roy, PK Yu, SS Henestroza, E Eylon, S Shuman, DB Ludvig, J Bieniosek, FM Waldron, WL Greenway, WG Vanecek, DL Hannink, R Amezcua, M TI Electron-beam diagnostic for space-charge measurement of an ion beam SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INORGANIC SCINTILLATORS; NEUTRALIZATION AB A nonperturbing electron-beam diagnostic system for measuring the charge distribution of an ion beam is developed for heavy ion fusion beam physics studies. Conventional diagnostics require temporary insertion of sensors into the beam, but such diagnostics stop the beam, or significantly alter its properties. In this diagnostic a low energy, low current electron beam is swept transversely across the ion beam; the measured electron-beam deflection is used to infer the charge density profile of the ion beam. The initial application of this diagnostic is to the neutralized transport experiment (NTX), which is exploring the physics of space-charge-dominated beam focusing onto a small spot using a neutralizing plasma. Design and development of this diagnostic and performance with the NTX ion beamline is presented. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Roy, PK (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM pkroy@lbl.gov NR 28 TC 2 Z9 2 U1 2 U2 8 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 FEB PY 2005 VL 76 IS 2 AR 023301 DI 10.1063/1.1847392 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400016 ER PT J AU Ryutov, DD AF Ryutov, DD TI Thermoelastic effects as a way of creating transient renewable reflective optics SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID X-RAY OPTICS; COHERENT-LIGHT SOURCE; LASERS; DAMAGE; LCLS AB A technique for creating renewable reflective optics suitable for focusing of pulsed laser beams is proposed. It is based on the heating of the surface of a planar reflecting slab by an auxiliary heating source that causes thermal expansion of the slab material and creates a desired surface relief, e.g., a focusing mirror. The presence of this relief is a transient phenomenon, but, for a short-enough main pulse, this does not cause any problems. If the surface is damaged by the main pulse, the shifting of the slab and repeating the whole cycle allows recreating the transient mirror. Favorable features of this approach include controlling the optics "at a distance," without any direct mechanical contact. A detailed discussion of the possibilities provided by this technique for the focusing of x-ray beams at the planned Linac Coherent Light Source facility at Stanford is presented. It is concluded that a 20-fold increase of intensity of an 8 keV beam and 100-fold increase of intensity of a 0.8 keV beam is possible. A set of design equations and constraints is formulated. The analysis presented can be used as a template for analyses of similar transient optical systems for the UV and optical range. (C) 2005 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Fus Energy Program, Livermore, CA 94551 USA. RP Ryutov, DD (reprint author), Lawrence Livermore Natl Lab, Fus Energy Program, L-630,7000 East Ave, Livermore, CA 94551 USA. EM ryutov1@llnl.gov NR 17 TC 2 Z9 2 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 2005 VL 76 IS 2 AR 023113 DI 10.1063/1.1850671 PG 13 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400014 ER PT J AU Schmid, P Feng, J Padmore, H Robin, D Rose, H Schlueter, R Wan, WS Forest, E Wu, Y AF Schmid, P Feng, J Padmore, H Robin, D Rose, H Schlueter, R Wan, WS Forest, E Wu, Y TI Correction and alignment strategies for the beam separator of the photoemission electron microscope 3 (PEEM3) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ABERRATIONS; MICROSCOPE; RESOLUTION AB A high-resolution aberration-corrected photoemission electron microscope (PEEM3) will be installed on an undulator beamline at the Advanced Light Source at the Lawrence Berkeley National Laboratory. The aim of this instrument is to provide a substantial flux and resolution improvement by employing an electron mirror for correcting both the third-order spherical aberration and the primary chromatic aberration. In order to utilize this concept of correction, a beam separator is a prerequisite. Crucial to achieving a resolution of 5 nm for the high-resolution mode, and a 16-fold increase in throughput at the same resolution as its predecessor, PEEM2, specified as 20 nm at 2% transmission, for the high flux mode is the double-symmetric design of the beam separator, which eliminates all the second-order geometric aberrations. Nonetheless, substantial tuning capabilities must be incorporated into the PEEM3 design to compensate for both systematic and random errors. In this article, we investigate how to correct for nonsystematic imperfections and for systematic uncertainties in the accuracy of the magnetic fields and focus on how degradation of the resolution and the field of view can be minimized. Finally, we outline a tentative correction strategy for PEEM3. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan. Duke Univ, Dept Phys, Durham, NC 27708 USA. RP Schmid, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd,Mail Stop 80R0114, Berkeley, CA 94720 USA. EM poschmid@lbl.gov NR 19 TC 12 Z9 12 U1 1 U2 7 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 FEB PY 2005 VL 76 IS 2 AR 023302 DI 10.1063/1.1841871 PG 14 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400017 ER PT J AU Stipe, CB Higgins, BS Lucas, D Koshland, CP Sawyer, RF AF Stipe, CB Higgins, BS Lucas, D Koshland, CP Sawyer, RF TI Inverted co-flow diffusion flame for producing soot SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID COUNTERFLOW; TEMPERATURE; PARTICLES; GENERATOR; DILUTION AB We developed an inverted, co-flow, methane/air/nitrogen burner that generates a wide range of soot particles sizes and concentrations. By adjusting the flow rates of air, methane, and nitrogen in the fuel, the mean electric mobility diameter and number concentration are varied. Additional dilution downstream of the flame allows us to generate particle concentrations spanning those produced by spark-ignited and diesel engines: particles with mean diameters between 50 and 250 nm and number concentrations from 4.7.10(4) to 10(7) cm(-3). The range of achievable number concentrations, and therefore volume concentrations, can be increased by a factor of 30 by reducing the dilution ratio. These operating conditions make this burner valuable for developing and calibrating diagnostics as well as for other studies involving soot particles. (C) 2005 American Institute of Physics. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA. RP Lucas, D (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM D_lucas@lbl.gov RI Sawyer, Robert/B-5013-2014 NR 30 TC 17 Z9 17 U1 3 U2 14 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 FEB PY 2005 VL 76 IS 2 AR 023908 DI 10.1063/1.1851492 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400041 ER PT J AU Stutman, D Finkenthal, M Suliman, G Tritz, K Delgado-Aparicio, L Kaita, R Johnson, D Soukhanovskii, V May, MJ AF Stutman, D Finkenthal, M Suliman, G Tritz, K Delgado-Aparicio, L Kaita, R Johnson, D Soukhanovskii, V May, MJ TI Spectroscopic imaging diagnostics for burning plasma experiments SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SOFT-X-RAY; TRANSMISSION GRATING MONOCHROMATOR; EXTREME-ULTRAVIOLET; MULTILAYER MIRROR; CONCEPTUAL DESIGN; WAVELENGTH RANGE; SPHERICAL TORUS; FUSION PLASMAS; PHOTON SIEVES; ITER AB Spectroscopic imaging of plasma emission profiles from a few electron volts to tens of kilo-electron volts enables basic diagnostics in present day tokamaks. For the more difficult burning plasma conditions, light extraction and detection techniques, as well as instrument designs need to be investigated. As an alternative to light extraction with reflective optics, we discuss normal incidence, transmissive-diffractive optics (e.g., transmission gratings), which might withstand plasma exposure with less degradation of optical properties. Metallic multilayer reflectors are also of interest for light extraction. Although a shift of the diffraction peak might occur, instrument designs that accommodate such shifts are possible. As imaging detectors we consider "optical" arrays based on conversion of the short-wavelength light into visible light followed by transport of the visible signal with hollow lightguides. The proposed approaches to light extraction and detection could enable radiation resistant diagnostics. (C) 2005 American Institute of Physics. C1 Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Stutman, D (reprint author), Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. EM stutman@pppl.gov RI Stutman, Dan/P-4048-2015; Suliman, gabriel/B-1443-2017 NR 48 TC 6 Z9 6 U1 0 U2 4 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 FEB PY 2005 VL 76 IS 2 AR 023505 DI 10.1063/1.1852317 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA 893SB UT WOS:000226738400024 ER PT J AU Amor, YB Shashkina, E Johnson, S Bifani, PJ Kurepina, N Kreiswirth, B Bhattacharya, S Spencer, J Rendon, A Catanzaro, A Gennaro, ML AF Amor, YB Shashkina, E Johnson, S Bifani, PJ Kurepina, N Kreiswirth, B Bhattacharya, S Spencer, J Rendon, A Catanzaro, A Gennaro, ML TI Immunological characterization of novel secreted antigens of Mycobacterium tuberculosis SO SCANDINAVIAN JOURNAL OF IMMUNOLOGY LA English DT Article ID ANTIBODY-RESPONSES; ESCHERICHIA-COLI; HOST RESPONSES; 38 KDA; PROTEINS; INFECTION; IDENTIFICATION; EPIDEMIOLOGY; DISEASES; GENOME AB Proteins secreted by Mycobacterium tuberculosis are targets of host immune responses and as such are investigated for vaccine and immunodiagnostics development. Computer-driven searches of the M. tuberculosis H(37)Rv genome had previously identified 45 novel secreted proteins. Here, we report the characterization of these antigens in terms of specificity for the M. tuberculosis complex and the ability to induce human immune responses. BLAST homology searches and Southern hybridization identified 10 genes that were either specific for the M. tuberculosis complex or found in only two nontuberculous mycobacterial species of minor medical significance. Selected recombinant proteins were purified from Escherichia coli cells and tested for the ability to elicit antibody responses in tuberculosis patients. Reactivity of the serum panel was '36% with at least one of five novel proteins (Rv0203, Rv0603, Rv1271c, Rv1804c and Rv2253), 56% with the 38 kDa lipoprotein, a M. tuberculosis antigen known to be highly seroreactive, and 68% with a combination of Rv0203, Rv1271c and the 38 kDa antigen. Thus, at least five novel secreted proteins induce antibody responses during active disease; some of these proteins may increase the sensitivity of serological assays based on the 38 kDa antigen. C1 Publ Hlth Res Inst, Newark, NJ USA. Univ Calif Los Angeles, DOE MBI Ctr Genom & Proteom, Los Angeles, CA USA. Colorado State Univ, Ft Collins, CO 80523 USA. UANL, Univ Hosp Monterrey, Mexico City, DF, Mexico. Univ Calif San Diego, San Diego, CA 92103 USA. RP Gennaro, ML (reprint author), 225 Warren St, Newark, NJ 07103 USA. EM gennaro@phri.org FU NIAID NIH HHS [AI-36989] NR 31 TC 8 Z9 9 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0300-9475 EI 1365-3083 J9 SCAND J IMMUNOL JI Scand. J. Immunol. PD FEB PY 2005 VL 61 IS 2 BP 139 EP 146 DI 10.1111/j.0300-9475.2005.01557.x PG 8 WC Immunology SC Immunology GA 893GU UT WOS:000226708100004 PM 15683450 ER PT J AU Li, J Liu, WC Zhai, T Kenik, EA AF Li, J Liu, WC Zhai, T Kenik, EA TI Comparison of recrystallization texture in cold-rolled continuous cast AA5083 and 5182 aluminum alloys SO SCRIPTA MATERIALIA LA English DT Article DE aluminum; cold rolling; recrystallization; texture; X-ray diffraction; TEM ID P-ORIENTATION; ALLOY; NUCLEATION; ALUMINUM; MN AB The recrystallization microstructure and texture of cold-rolled continuous cast AA 5083 and 5182 aluminum alloys with and without prior heat treatment were investigated by optical microscopy, X-ray diffraction and TEM. The results obtained were discussed with regard to the effect of Zener-particle pinning. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. C1 Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA. Beijing Jiaotong Univ, Dept Civil & Environm Engn, Beijing, Peoples R China. Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA. RP Zhai, T (reprint author), Univ Kentucky, Dept Chem & Mat Engn, 177 Anderson Hall, Lexington, KY 40506 USA. EM tzhai@engr.uky.edu NR 15 TC 17 Z9 19 U1 0 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD FEB PY 2005 VL 52 IS 3 BP 163 EP 168 DI 10.1016/j.scriptamat.2004.10.003 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 873JN UT WOS:000225275900001 ER PT J AU Meco, H Napolitano, RE AF Meco, H Napolitano, RE TI Liquidus and solidus boundaries in the vicinity of order-disorder transitions in the Fe-Si system SO SCRIPTA MATERIALIA LA English DT Article DE differential thermal analysis; phase diagram; thermodynamics ID IRON-SILICON; ALLOYS; PHASES; EQUILIBRIA AB Differential thermal analysis (DTA) is used for liquidus and solidus measurements in binary Fe-Si alloys. The heating-rate and composition dependence of the DTA response is quantified, and we report phase boundaries that differ considerably from previous reports. Implications of A2-B2 ordering and thermodynamic treatments are discussed. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. C1 Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames Lab, US DOE, Ames, IA 50011 USA. RP Napolitano, RE (reprint author), Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames Lab, US DOE, 204A Wilhelm Hall, Ames, IA 50011 USA. EM ralphn@iastate.edu NR 30 TC 8 Z9 8 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD FEB PY 2005 VL 52 IS 3 BP 221 EP 226 DI 10.1016/j.sciptamat.2004.09.026 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 873JN UT WOS:000225275900011 ER PT J AU Choi, SY Mamak, M Speakman, S Chopra, N Ozin, GA AF Choi, SY Mamak, M Speakman, S Chopra, N Ozin, GA TI Evolution of nanocrystallinity in periodic mesoporous anatase thin films SO SMALL LA English DT Article DE crystal growth; kinetics; mesoporous materials; nanocrystalline materials; thin films ID TIO2; TITANIA; ELECTRODES; DEVICES; SILICA AB Herein we report the first kinetic study of the intrachannel wall phase-transition of amorphous titania to nanocrystalline anatase for periodic mesoporous titania thin films, monitored by time-resolved in situ high-temperature X-ray diffraction. Structural transformations associated with the phase transition are further probed by high-resolution scanning electron microscopy and transmission electron microscopy. The model found to be most consistent with the kinetic data involves 1D diffusion-controlled growth of nanocrystalline anatase within the spatial confines of the channel walls of the mesostructure. The observation of anisotropic, rod-shaped anatase nanocrystals preferentially aligned along the channel axis implies that the framework of the liquid-crystal-templated mesostructure guides the crystal growth. C1 Univ Toronto, Dept Chem, Mat Chem Res Grp, Toronto, ON M5S 3H6, Canada. Univ Toronto, Dept Chem, Ctr Nanostruct Imaging, Toronto, ON M5S 3H6, Canada. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Xerox Res Ctr Canada Ltd, Mississauga, ON L5K 2L1, Canada. RP Choi, SY (reprint author), Univ Toronto, Dept Chem, Mat Chem Res Grp, 80 St George St, Toronto, ON M5S 3H6, Canada. EM gozin@chem.utoronto.ca NR 26 TC 67 Z9 67 U1 1 U2 17 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 1613-6810 J9 SMALL JI Small PD FEB PY 2005 VL 1 IS 2 BP 226 EP 232 DI 10.1002/smll.200400038 PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA 926IV UT WOS:000229117800011 PM 17193436 ER PT J AU Nichols, WE Last, GV Kincaid, CT AF Nichols, WE Last, GV Kincaid, CT TI Vadose zone modeling of dispersed waste sites in the framework of an integrated stochastic environmental transport and impacts assessment code for the Hanford Site SO STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT LA English DT Article DE vadose zone; groundwater; stochastic; Monte Carlo; Hanford; SAC; system assessment capability; STOMP AB The system assessment capability (SAC) is the first total-system stochastic simulator to address inventory distribution, environmental release and transport, and impacts to human health and ecological, economic, and cultural resources from hundreds of radiological and chemical waste disposal sites for the entire Hanford Site in southeast Washington State. Flow and contaminant transport modeling in the vadose zone at 720 individual sites has been integrated into the SAC stochastic software framework using the STOMP code, providing the means to define release to the regional aquifer to support the SAC groundwater transport model. Important features, events, and processes including remedial actions, time-variant natural infiltration rates, and high volume aqueous-phase discharges were addressed in the software and data. A separate data extraction program, VZGRAB, was developed to enable analysts to aggregate vadose zone release data across the hundreds of waste sites in various ways following a SAC simulation to develop an improved understanding of the system performance and uncertainty aspects. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Nichols, WE (reprint author), Pacific NW Natl Lab, POB 999,MSIN K9-33, Richland, WA 99352 USA. EM will.nichols@pnl.gov NR 15 TC 1 Z9 1 U1 1 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 1436-3240 J9 STOCH ENV RES RISK A JI Stoch. Environ. Res. Risk Assess. PD FEB PY 2005 VL 19 IS 1 BP 24 EP 32 DI 10.1007/s00477-004-0201-9 PG 9 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences; Statistics & Probability; Water Resources SC Engineering; Environmental Sciences & Ecology; Mathematics; Water Resources GA 894SN UT WOS:000226812000003 ER PT J AU Saito, H McKenna, SA Zimmerman, DA Coburn, TC AF Saito, H McKenna, SA Zimmerman, DA Coburn, TC TI Geostatistical interpolation of object counts collected from multiple strip transects: Ordinary kriging versus finite domain kriging SO STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT LA English DT Article DE transect data; kriging weight; unexploded ordnance; jackknife; Poisson process AB Data collected along transects are becoming more common in environmental studies as indirect measurement devices, such as geophysical sensors, that can be attached to mobile platforms become more prevalent. Because exhaustive sampling is not always possible under constraints of time and costs, geostatistical interpolation techniques are used to estimate unknown values at unsampled locations from transect data. It is known that outlying observations can receive significantly greater ordinary kriging weights than centrally located observations when the data are contiguously aligned along a transect within a finite search window. Deutsch (1994) proposed a kriging algorithm, finite domain kriging, that uses a redundancy measure in place of the covariance function in the data-to-data kriging matrix to address the problem of overweighting the outlying observations. This paper compares the performances of two kriging techniques, ordinary kriging (OK) and finite domain kriging (FDK), on examining unexploded ordnance (UXO) densities by comparing prediction errors at unsampled locations. The impact of sampling design on object count prediction is also investigated using data collected from transects and at random locations. The Poisson process is used to model the spatial distribution of UXO for three 5000 x 5000 m fields; one of which does not have any ordnance target (homogeneous field), while the other two sites have an ordnance target in the center of the site (isotropic and anisotropic fields). In general, for a given sampling transects width, the differences between OK and FDK in terms of the mean error and the mean square error are not significant regardless of the sampled area and the choice of the field. When 20% or more of the site is sampled, the estimation of object counts is unbiased on average for all three fields regardless of the choice of the transect width and the choice of the kriging algorithm. However, for non-homogeneous fields (isotropic and anisotropic fields), the mean error fluctuates considerably when a small number of transects are sampled. The difference between the transect sampling and the random sampling in terms of prediction errors becomes almost negligible if more than 20% of the site is sampled. Overall, FDK is no better than OK in terms of the prediction performances when the transect sampling procedure is used. C1 Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA. Sandia Natl Labs, Geohydrol Dept, Albuquerque, NM 87185 USA. SEASOFT, Hydrol Serv, Cedar Crest, NM 87008 USA. SEASOFT, Engn Consulting Serv, Cedar Crest, NM 87008 USA. Abilene Christian Univ, Dept Management Sci, Abilene, TX 79699 USA. RP Saito, H (reprint author), Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA. EM hirotaka.saito@gmail.com RI Saito, Hirotaka/C-1911-2013 OI Saito, Hirotaka/0000-0002-9458-008X NR 26 TC 35 Z9 39 U1 0 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1436-3240 EI 1436-3259 J9 STOCH ENV RES RISK A JI Stoch. Environ. Res. Risk Assess. PD FEB PY 2005 VL 19 IS 1 BP 71 EP 85 DI 10.1007/s00477-004-0207-3 PG 15 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences; Statistics & Probability; Water Resources SC Engineering; Environmental Sciences & Ecology; Mathematics; Water Resources GA 894SN UT WOS:000226812000008 ER PT J AU Xie, YM Kaminski, MD Mertz, CJ Finck, MR Guy, SG Rosengart, AJ AF Xie, YM Kaminski, MD Mertz, CJ Finck, MR Guy, SG Rosengart, AJ TI Protein encapsulated nanocarriers for magnetically guided, targeted thrombolysis SO STROKE LA English DT Meeting Abstract CT 30th International Stroke Conference CY FEB 02-04, 2005 CL New Orleans, LA SP Amer Stroke Assoc C1 Univ Chicago, Chicago, IL 60637 USA. Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0039-2499 J9 STROKE JI Stroke PD FEB PY 2005 VL 36 IS 2 BP 496 EP 496 PG 1 WC Clinical Neurology; Peripheral Vascular Disease SC Neurosciences & Neurology; Cardiovascular System & Cardiology GA 904UR UT WOS:000227523800397 ER PT J AU Brunger, AT AF Brunger, AT TI Low-resolution crystallography is coming of age SO STRUCTURE LA English DT Editorial Material ID REFINEMENT C1 Stanford Synchrotron Radiat Lab, Howard Hughes Med Inst, Dept Cellular & Mol Physiol, Stanford, CA 94305 USA. Stanford Synchrotron Radiat Lab, Howard Hughes Med Inst, Dept Neurol & Neurol Sci, Stanford, CA 94305 USA. RP Brunger, AT (reprint author), Stanford Synchrotron Radiat Lab, Howard Hughes Med Inst, Dept Cellular & Mol Physiol, Stanford, CA 94305 USA. OI Brunger, Axel/0000-0001-5121-2036 NR 11 TC 15 Z9 15 U1 0 U2 3 PU CELL PRESS PI CAMBRIDGE PA 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA SN 0969-2126 J9 STRUCTURE JI Structure PD FEB PY 2005 VL 13 IS 2 BP 171 EP 172 DI 10.1016/j.str.2005.01.002 PG 2 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 898KT UT WOS:000227076400002 PM 15698560 ER PT J AU Davies, JM Tsuruta, H May, AP Weis, WI AF Davies, JM Tsuruta, H May, AP Weis, WI TI Conformational changes of p97 during nucleotide hydrolysis determined by small-angle X-ray scattering SO STRUCTURE LA English DT Article ID MEMBRANE-FUSION; ATPASE ACTIVITY; PROTEIN; COMPLEXES; NSF; P47; ER; DEGRADATION; MICROSCOPY; COFACTOR AB Valosin-containing protein (VCP)/p97 is an AAA family ATPase that has been implicated in the removal of misfolded proteins from the endoplasmic reticulum and in membrane fusion. p97 forms a homohexamer whose protomers consist of an N-terminal (N) domain responsible for binding to effector proteins, followed by two AAA ATPase domains, D-1 and D-2. Small-angle X-ray scattering (SAXS) measurements of p97 in the presence of AMP-PNP (ATP state), ADP-AIF(x) (hydrolysis transition state), ADP, or no nucleotide reveal major changes in the positions of the N domains with respect to the hexameric ring during the ATP hydrolysis cycle. Nucleotide binding and hydrolysis experiments indicate that D-2 inhibits nucleotide exchange by D-1. The data suggest that the conversion of the chemical energy of ATP hydrolysis into mechanical work on substrates involves transmission of conformational changes generated by D-2 through D-1 to move N. C1 Stanford Univ, Sch Med, Dept Biol Struct, Stanford, CA 94305 USA. Stanford Univ, Sch Med, Dept Mol & Cellular Physiol, Stanford, CA 94305 USA. Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA. RP Weis, WI (reprint author), Stanford Univ, Sch Med, Dept Biol Struct, 299 Campus Dr W, Stanford, CA 94305 USA. EM bill.weis@stanford.edu RI Weis, William/G-1437-2011 OI Weis, William/0000-0002-5583-6150 FU NIMH NIH HHS [MH58570] NR 40 TC 76 Z9 77 U1 1 U2 5 PU CELL PRESS PI CAMBRIDGE PA 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA SN 0969-2126 J9 STRUCTURE JI Structure PD FEB PY 2005 VL 13 IS 2 BP 183 EP 195 DI 10.1016/j.str.2004.11.014 PG 13 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 898KT UT WOS:000227076400005 PM 15698563 ER PT J AU Leschziner, AE Lemon, B Tjian, R Nogales, E AF Leschziner, AE Lemon, B Tjian, R Nogales, E TI Structural studies of the human PBAF chromatin-remodeling complex SO STRUCTURE LA English DT Article ID NUCLEOSOME CORE PARTICLE; SWI/SNF COMPLEXES; ESCHERICHIA-COLI; RSC; RECONSTRUCTION; VISUALIZATION; TRANSCRIPTION; STIMULATION; MECHANISMS; RESOLUTION AB ATP-dependent chromatin remodeling is one of the central processes responsible for imparting fluidity to chromatin and thus regulating DNA transactions. Although knowledge on this process is accumulating rapidly, the basic mechanism (or mechanisms) by which the remodeling complexes alter the structure of a nucleosome is not yet understood. Structural information on these macromolecular machines should aid in interpreting the biochemical and genetic data; to this end, we have determined the structure of the human PBAF ATP-dependent chromatin-remodeling complex preserved in negative stain by electron microscopy and have mapped the nucleosome binding site using two-dimensional (2D) image analysis. PBAF has an overall C-shaped architecture-with a larger density to which two smaller knobs are attached-surrounding a central cavity; one of these knobs appears to be flexible and occupies different positions in each of the structures determined. The 2D analysis of PBAF:nucleosome complexes indicates that the nucleosome binds in the central cavity. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA. RP Nogales, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM enogales@lbl.gov NR 27 TC 26 Z9 27 U1 0 U2 2 PU CELL PRESS PI CAMBRIDGE PA 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA SN 0969-2126 J9 STRUCTURE JI Structure PD FEB PY 2005 VL 13 IS 2 BP 267 EP 275 DI 10.1016/j.str.2004.12.008 PG 9 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 898KT UT WOS:000227076400012 PM 15698570 ER PT J AU Hull, JR Hanany, S Matsumura, T Johnson, B Jones, T AF Hull, JR Hanany, S Matsumura, T Johnson, B Jones, T TI Characterization of a high-temperature superconducting bearing for use in a cosmic microwave background polarimeter SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 4th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials CY JUN 30-JUL 02, 2003 CL Jena, GERMANY SP Inst Physikal Hochtechnol AB We have previously presented a design for a cosmic microwave background (CMB) polarimeter in which a cryogenically cooled half-wave plate rotates by means of a high-temperature superconducting (HTS) bearing. Here, a prototype bearing, consisting of a commercially available ring-shaped permanent magnet and an array of YBCO bulk HTS material, has been constructed. We measured its coefficient of friction and vibrational property as a function of several parameters, including temperature between 15 and 83 K, rotation frequency between 0.3 and 3.5 Hz, levitation distance between 6 and 10 mm and ambient pressure of similar to 10(-7) Torr. We concluded that the low rotational drag, of the HTS bearing would allow rotations for long periods with minimal input power and negligible wear and tear, thus making this technology suitable for a future satellite mission. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. RP Hull, JR (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 25 Z9 25 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD FEB PY 2005 VL 18 IS 2 SI SI BP S1 EP S5 DI 10.1088/0953-2048/18/2/001 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA 908VY UT WOS:000227819500002 ER PT J AU Takenaka, H Ichimaru, S Nagai, K Ohchi, T Toy, H Gullikson, EM AF Takenaka, H Ichimaru, S Nagai, K Ohchi, T Toy, H Gullikson, EM TI Multilayer mirrors for mu-XPS using a Schwarzschild objective SO SURFACE AND INTERFACE ANALYSIS LA English DT Article; Proceedings Paper CT 4th International Symposium on Atomic Level Characterization for New Materials and Devices CY OCT 05-10, 2003 CL Kauai, HI DE multilayer; soft x-ray mirror; soft x-ray photoelectron spectroscopy ID SPECTROMICROSCOPY AB The development of highly reflective multilayer mirrors for use in the wavelength region around 6 nm has made it possible to use a multilayer-coated Schwarzschild objective for micro-x-ray photoemission spectroscopy. For this purpose, CoxCr1-x/C and W/C multilayers were fabricated by magnetron sputtering and the soft x-ray reflectivities were measured. The peak reflectivity of the Cr/C multilayer was found to be the highest with similar to18.9% at a wavelength of 6.42 nm and an incident angle of 88degrees. It is believed that a Cr/C multilayer will provide sufficient performance for use on a Schwarzschild mirror for x-ray photoemission spectroscopy using 6 nm x-rays. Copyright (C) 2005 John Wiley Sons, Ltd. C1 NTT Corp, Adv Technol Corp, Tokai, Ibaraki 3191193, Japan. Lawrence Berkeley Natl Lab Berkeley, Berkeley, CA 94720 USA. RP Takenaka, H (reprint author), NTT Corp, Adv Technol Corp, 162 Shirakata, Tokai, Ibaraki 3191193, Japan. EM takenaka@ibaraki.ntt-at.co.jp NR 7 TC 1 Z9 1 U1 1 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0142-2421 EI 1096-9918 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD FEB PY 2005 VL 37 IS 2 BP 181 EP 184 DI 10.1002/sia.1959 PG 4 WC Chemistry, Physical SC Chemistry GA 893SK UT WOS:000226739300021 ER PT J AU Grigoriev, A Shpyrko, O Steimer, C Pershan, PS Ocko, BM Deutsch, M Lin, BH Meron, M Graber, T Gebhardt, J AF Grigoriev, A Shpyrko, O Steimer, C Pershan, PS Ocko, BM Deutsch, M Lin, BH Meron, M Graber, T Gebhardt, J TI Surface oxidation of liquid Sn SO SURFACE SCIENCE LA English DT Article DE X-ray scattering, diffraction and reflection; oxidation; surface chemical reaction; surface structure, morphology; roughness, and topography; tin; tin oxides; liquid surfaces; polycrystalline thin films ID X-RAY; HIGH-PRESSURE; METALS; DIOXIDES AB We report the results of an X-ray scattering study that reveals oxidation kinetics and formation of a previously unreported crystalline phase of SnO at the liquid-vapour interface of Sn. Our experiments reveal that the pure liquid Sn surface does not react with molecular oxygen below an activation pressure of similar to5.0 x 10(-6)Torr. Above that pressure a rough solid Sn oxide grows over the liquid metal surface. Once the activation pressure has been exceeded the oxidation proceeds at pressures below the oxidation pressure threshold. The observed diffraction pattern associated with the surface oxidation does not match any of the known Sn oxide phases. The data have an explicit signature of the face-centred cubic structure, however it requires lattice parameters that are about 9% smaller than those reported for cubic structures of high-pressure phases of Sn oxides. (C) 2004 Elsevier B.V. All rights reserved. C1 Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Harvard Univ, Dept Phys, Cambridge, MA 02138 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel. Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA. RP Grigoriev, A (reprint author), Harvard Univ, Div Engn & Appl Sci, 9 Oxford St, Cambridge, MA 02138 USA. EM alexey@xray.harvard.edu RI Shpyrko, Oleg/J-3970-2012 NR 25 TC 10 Z9 11 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 1 PY 2005 VL 575 IS 3 BP 223 EP 232 DI 10.1016/j.susc.2004.10.034 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 897FH UT WOS:000226988900001 ER PT J AU Brodie, JD Figueroa, E Laska, EM Dewey, SL AF Brodie, JD Figueroa, E Laska, EM Dewey, SL TI Safety and efficacy of gamma-vinyl GABA (GVG) for the treatment of methamphetamine and/or cocaine addiction SO SYNAPSE LA English DT Article DE vigabatrin; methamphetamine; cocaine; treatment; addiction ID NUCLEUS-ACCUMBENS DOPAMINE; INDUCED INCREASES; VIGABATRIN; RATS; EXPRESSION; BLOCKS; TRANSAMINASE; DEPENDENCE; INHIBITOR; STRATEGY AB This study examined the safety and efficacy of gamma vinyl-GABA (GVG, vigabatrin) for the treatment of methamphetamine and/or cocaine addiction. A total of 30 subjects, who met DSM-IV criteria for methamphetamine and/or cocaine dependence, were enrolled in an open label 9-week safety study. The protocol was specifically designed to include extensive visual field monitoring as well as outcome measures of therapeutic efficacy. Patients were screened twice weekly for the presence of urinary cocaine, methamphetamine, heroin, alcohol, and marijuana. In total, 18/30 subjects completed the study and 16/18 tested negative for methamphetamine and cocaine during the last 6 weeks of the trial. GVG did not produce any visual field defects or alterations in visual acuity. Furthermore, it did not produce changes in vital signs even with continued use of methamphetamine and cocaine. Thus, under conditions that appear to be appropriate for the successful treatment of methamphetamine and/or cocaine addiction, GVG is safe. (C) 2004 Wiley-Liss, Inc. C1 NYU, Sch Med, Dept Psychiat, New York, NY 10016 USA. Clin Integral Tratamiento Adicc, Mexicali 21120, Baja California, Mexico. Nathan S Kline Inst Psychiat Res, Div Stat Sci & Epidemiol, Orangeburg, NY 10962 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Brodie, JD (reprint author), NYU, Sch Med, Dept Psychiat, 550 1St Ave, New York, NY 10016 USA. EM brodij01@gcrc.med.nyu.edu OI Laska, Eugene/0000-0001-6799-1361; Brodie, Jonathan/0000-0002-2254-8654 FU NIDA NIH HHS [DA15082, DA015041] NR 26 TC 71 Z9 76 U1 0 U2 5 PU WILEY-LISS PI HOBOKEN PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0887-4476 J9 SYNAPSE JI Synapse PD FEB PY 2005 VL 55 IS 2 BP 122 EP 125 DI 10.1002/syn.20097 PG 4 WC Neurosciences SC Neurosciences & Neurology GA 882DK UT WOS:000225918700006 PM 15543630 ER PT J AU Gerbi, JE Birrell, J Sardela, M Carlisle, JA AF Gerbi, JE Birrell, J Sardela, M Carlisle, JA TI Macrotexture and growth chemistry in ultrananocrystalline diamond thin films SO THIN SOLID FILMS LA English DT Article DE nanocrystalline diamond; diamond; UNCD; XRD; preferred orientation; CVD ID VAPOR-DEPOSITED DIAMOND; ORIENTED DIAMOND; NUCLEATION; TEXTURE; SILICON; SURFACE; MEMS; BIAS; SI AB We have determined the average preferred crystalline orientation of thin ultrananocrystalline diamond (UNCD) films using X-ray diffraction. The grain size and lattice parameters of the films were also calculated. We show how these characteristics change markedly with the gas chemistry used during growth, adding either 0-20% nitrogen or 0-15% hydrogen to the argon-rich, argon and methane microwave plasma used. We discuss how these changes give evidence that there is a competing growth mechanism between C-2 dimer mediated growth and the more widely used methyl radical growth process. Finally, we identify an additional X-ray diffraction peak, dependent on both the substrate used and growth conditions, as silicon carbide. We discuss these results in the context of the growth mechanisms of ultrananocrystalline diamond. (C) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Illinois, Freder Seitz Mat Res Lab, Urbana, IL 61801 USA. Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA. RP Gerbi, JE (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jennygerbi@gmail.com NR 34 TC 25 Z9 25 U1 0 U2 5 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 1 PY 2005 VL 473 IS 1 BP 41 EP 48 DI 10.1016/j.tsf.2004.06.155 PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA 879WE UT WOS:000225749000007 ER PT J AU Kohli, S Theil, JA Dippo, PC Ahrenkiel, RK Rithner, CD Dorhout, PK AF Kohli, S Theil, JA Dippo, PC Ahrenkiel, RK Rithner, CD Dorhout, PK TI Chemical, optical, vibrational and luminescent properties of hydrogenated silicon-rich oxynitride films SO THIN SOLID FILMS LA English DT Article DE silicon-rich silicon oxynitride; XPS; ellipsometry; photoluminescence; thin film ID RAY PHOTOELECTRON-SPECTROSCOPY; THIN-FILMS; SI; NITROGEN; MULTILAYERS; NITRIDE; DIOXIDE; PLASMA AB X-ray photoelectron spectroscopy, spectroscopic ellipsometry, Foutier transform infrared and room temperature photoluminescence spectroscopy has been used to investigate the chemical, optical, vibrational and luminescent properties of Plasma Enhanced Chemical Vapor Deposited SiOxNy/H (0.17less than or equal toxless than or equal to0.96; 0.07less than or equal toyless than or equal to0.27), hydrogenated silicon-rich oxynitride (SRON). The linear dependence of the refractive index of the SRON films on the O/Si ratio was established. The photoluminescence from the SRON films were attributed to the embedded amorphous silicon clusters in the films. The dependence of luminescence maximum values on the O/Si and O/N ratios has been explored. We postulate that at O/Si ratio of 0.18 and an ON ratio of 2.0 (SiO0.N-18(0.09)) the film underwent a transformation from silicon-rich oxynitride to a-Si/H film with oxygen and nitrogen impurities. (C) 2004 Elsevier B.V. All rights reserved. C1 Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA. Agilent Technol, Santa Clara, CA 95051 USA. Natl Renewable Energy Lab, Measurements & Characterizat Div, Golden, CO 80401 USA. RP Kohli, S (reprint author), Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA. EM skohli@lamar.colostate.edu NR 26 TC 10 Z9 11 U1 1 U2 4 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 FEB 1 PY 2005 VL 473 IS 1 BP 89 EP 97 DI 10.1016/j.tsf.2004.07.054 PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA 879WE UT WOS:000225749000015 ER PT J AU Carroll, MS King, CA AF Carroll, MS King, CA TI Shortened photoconductance lifetime of Si/SiGe hetero structures due to interfacial oxygen or carbon from incomplete in-situ hydrogen cleans SO THIN SOLID FILMS LA English DT Article DE SiGe; computer simulation; epitaxy; photoconductivity ID CHEMICAL-VAPOR-DEPOSITION; SURFACE-RECOMBINATION VELOCITY; MINORITY-CARRIER LIFETIME; EPITAXIAL-GROWTH; GERMANIUM SURFACES; SILICON EPITAXY; HETEROSTRUCTURES; DEVICES AB The photoconductance decay lifetime in pseudomorpically strained <100> Si/Si0.7Ge0.3 heterostructures grown by rapid thermal chemical vapor deposition is measured in heterostructures with and without oxygen and carbon at the interface between the silicon substrate and epitaxial Si0.7Ge0.3 layer. A standard ex-situ clean combined with an in-situ hydrogen cleaning step using different combinations of hydrogen flows (0-20 slpm), pressure (80-8.8 x 10(4) Pa), and temperature (760-865 degreesC) are used to produce high oxygen and or carbon concentrations at the interface, measured by secondary ion mass spectrometry. For all cases in which oxygen was detected at the interface the heterostructure's lifetime were significantly shorter, 55-113 mus, compared to that in device quality Si/Si0.7Ge0.3 heterostructures, 530 mus, grown using a 1 min, 900 degreesC in-situ hydrogen bake that regularly reduces oxygen and carbon contamination below SIMS detection limits. Numeric simulations of the Si/Si0.7Ge0.3 heterostructures indicate that increasing recombination at the interface leads to a saturation of the lifetime at approximately 55 mus due to electron transport limited recombination at the Si/SiGe interface, consistent with the experimental observations. (C) 2004 Elsevier B.V. All rights reserved. C1 Agere Syst, Allentown, PA 18109 USA. RP Carroll, MS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM malcolmc@alumni.princeton.edu NR 29 TC 2 Z9 2 U1 4 U2 6 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 1 PY 2005 VL 473 IS 1 BP 137 EP 144 DI 10.1016/j.tsf.2004.07.082 PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA 879WE UT WOS:000225749000021 ER PT J AU Stefaniak, AB Guilmette, RA Day, GA Hoover, MD Breysse, PN Scripsick, RC AF Stefaniak, AB Guilmette, RA Day, GA Hoover, MD Breysse, PN Scripsick, RC TI Characterization of phagolysosomal simulant fluid for study of beryllium aerosol particle dissolution SO TOXICOLOGY IN VITRO LA English DT Article DE alveolar macrophage phagolysosome; dissolution; simulant; chronic beryllium disease ID RABBIT ALVEOLAR MACROPHAGES; COBALT OXIDE PARTICLES; IN-VITRO DISSOLUTION; INVITRO DISSOLUTION; PH; METAL; CANINE; PHAGOCYTOSIS; SOLUBILITY; DISEASE AB A simulant of phagolysosomal fluid is needed for beryllium particle dissolution research because intraphagolysosomal dissolution is believed to be a necessary step in the cellular immune response associated with development of chronic beryllium disease. Thus, we refined and characterized a potassium hydrogen phthalate (KHP) buffered solution with pH 4.55, termed phagolysosomal simulant fluid (PSF), for use in a static dissolution technique. To characterize the simulant, beryllium dissolution in PSF was compared to dissolution in the J774A.1 murine cell line. The effects of ionic composition, buffer strength, and the presence of the antifungal agent alkylbenzyldimethylammonium chloride (ABDC) on beryllium dissolution in PSF were evaluated. Beryllium dissolution in PSF was not different from dissolution in the J774A.1 murine cell line (p = 0.78) or from dissolution in another simulant having the same pH but different ionic composition (p = 0.73). A buffer concentration of 0.01-M KHP did not appear adequate to maintain pH under all conditions. There was no difference between dissolution in PSF with 0.01-M KHP and 0.02-M KHP (p = 0.12). At 0.04-M KHP, beryllium dissolution was increased relative to 0.02-M KHP (p = 0.02). Use of a 0.02-M KHP buffer concentration in the standard formulation for PSF provided stability in pH without alteration of the dissolution rate. The presence of ABDC did not influence beryllium dissolution in PSF (P = 0.35). PSF appears to be a useful and appropriate model of in vitro beryllium dissolution when using a static dissolution technique. In addition, the critical approach used to evaluate and adjust the composition of PSF may serve as a framework for characterizing PSF to study dissolution of other metal and oxide particles. Published by Elsevier Ltd. C1 NIOSH, Ctr Dis Control & Prevent, Morgantown, WV 26505 USA. Los Alamos Natl Lab, Hlth Saftey & Radiat Protect Div, Los Alamos, NM 87545 USA. Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Div Environm Hlth Engn, Baltimore, MD 21205 USA. Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA. RP Stefaniak, AB (reprint author), NIOSH, Ctr Dis Control & Prevent, Morgantown, WV 26505 USA. EM astefaniak@cdc.gov RI Stefaniak, Aleksandr/I-3616-2012; Hoover, Mark/I-4201-2012 OI Hoover, Mark/0000-0002-8726-8127 FU NIEHS NIH HHS [ES07141]; NIOSH CDC HHS [1R03 OH007447-01] NR 40 TC 38 Z9 40 U1 0 U2 13 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0887-2333 J9 TOXICOL IN VITRO JI Toxicol. Vitro PD FEB PY 2005 VL 19 IS 1 BP 123 EP 134 DI 10.1016/j.tiv.2004.08.001 PG 12 WC Toxicology SC Toxicology GA 895UE UT WOS:000226888400014 PM 15582363 ER PT J AU Gutierrez-Mora, F Erdemir, A Goretta, KC Dominguez-Rodriguez, A Routbort, JL AF Gutierrez-Mora, F Erdemir, A Goretta, KC Dominguez-Rodriguez, A Routbort, JL TI Dry and oil-lubricated sliding wear of Si3N4 and Si3N4/BN fibrous monoliths SO TRIBOLOGY LETTERS LA English DT Article DE friction; wear; lubrication; ceramics; fibrous monoliths ID SILICON-NITRIDE; TRIBOLOGICAL BEHAVIOR; CERAMIC MATERIALS; FRICTION; PERFORMANCE; CONTACT; FACES; WATER; METAL AB A high-temperature ball-on-flat tribometer was used to investigate dry and oil-lubricated friction and wear of sintered Si3N4 and Si3N4/hexagonal boron nitride (H-BN) fibrous monoliths. The friction coefficients of base Si3N4 flats sliding against Si3N4 balls were in the range of 0.6 - 0.8 for dry and 0.03 - 0.15 for lubricated sliding, and the average wear rates of Si3N4 were approximate to 10(-5) mm(3) N-1 m(-1) for dry sliding and approximate to 10(-10) - 10(-8) mm(3) N-1 m(-1) for lubricated sliding. The friction coefficients of Si3N4 balls against composite fibrous monoliths were approximate to0.7 for dry sliding and 0.01 - 0.08 for lubricated sliding. The average specific wear rates of the pairs were of the same order as those measured for the conventional Si3N4 pairs. However, the fibrous monoliths, in combination with sprayed dry boron nitride, resulted in reduction in the lubricated friction coefficients of the test pairs and significant reduction in their wear rates. The most striking result of this study was that the coefficients of friction of the Si3N4/ H-BN fibrous monolith test pair were 70 - 80% lower than those of either roughened or polished Si3N4 when tests were performed under oil-lubricated sliding conditions over long distances ( up to 5000 m). The results indicated that Si3N4/H-BN fibrous monoliths have good wear resistance and can be used to reduce friction under lubricated sliding conditions. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Gutierrez-Mora, F (reprint author), Univ Seville, Dipartimento Fis Mat Condensada, POB 1065, Seville 41080, Spain. EM fegumo@us.es RI Gutierrez-Mora, Felipe/H-4625-2015; OI Gutierrez-Mora, Felipe/0000-0003-3632-7163; Dominguez-Rodriguez, Arturo/0000-0003-1598-5669 NR 34 TC 10 Z9 10 U1 1 U2 8 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1023-8883 J9 TRIBOL LETT JI Tribol. Lett. PD FEB PY 2005 VL 18 IS 2 BP 231 EP 237 DI 10.1007/s11249-004-2747-6 PG 7 WC Engineering, Chemical; Engineering, Mechanical SC Engineering GA 903KO UT WOS:000227424900012 ER PT J AU Kilaas, R Marks, LD Own, CS AF Kilaas, R Marks, LD Own, CS TI EDM 1.0: Electron direct methods SO ULTRAMICROSCOPY LA English DT Article ID DYNAMICAL DIRECT-METHODS; CRYSTAL-STRUCTURE DETERMINATION; DIFFRACTION STRUCTURE-ANALYSIS; CRYSTALLOGRAPHY; MICROSCOPY; PATTERNS; SURFACE; IMAGES; SYSTEM AB A computer program designed to provide a number of quantitative analysis tools for high-resolution imaging and electron diffraction data is described. The pro-ram includes basic image manipulation. both real space and reciprocal space image processing. Wiener-filtering, symmetry averaging. methods for quantification of electron diffraction patterns and two-dimensional direct methods. The program consists of a number of sub-programs written in a combination of C++, C and Fortran. It can be downloaded either as GNU source code or as binaries and has be-en compiled and verified on a wide range of platforms, both Unix based and PC's. Elements of the de,,sip philosophy as well as future possible extensions are described. (C) 2004 Published by Elsevier B.V. C1 Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60201 USA. Lawrence Berkeley Natl Labs, Natl Ctr Electron Microscopy, Berkeley, CA USA. RP Marks, LD (reprint author), Northwestern Univ, Dept Mat Sci & Engn, 2225 N Campus Dr, Evanston, IL 60201 USA. EM L-marks@northwestern.edu RI Marks, Laurence/B-7527-2009 NR 34 TC 23 Z9 23 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD FEB PY 2005 VL 102 IS 3 BP 233 EP 237 DI 10.1016/j.ultamic.2004.10.004 PG 5 WC Microscopy SC Microscopy GA 889IL UT WOS:000226436600009 PM 15639355 ER PT J AU Glass, RJ Brainard, JR Yeh, TCJ AF Glass, RJ Brainard, JR Yeh, TCJ TI Infiltration in unsaturated layered fluvial deposits at Rio Bravo: Macroscopic anisotropy and heterogeneous transport SO VADOSE ZONE JOURNAL LA English DT Article ID STATE-DEPENDENT ANISOTROPY; EFFECTIVE FLOW BEHAVIOR; POROUS-MEDIA; STOCHASTIC-ANALYSIS; PREFERENTIAL FLOW; VADOSE ZONE; HYDRAULIC CONDUCTIVITY; NUMERICAL-MODEL; SOILS; WATER AB An infiltration and dye transport experiment was conducted to visualize flow and transport processes in a heterogeneous, layered, sandy-gravelly fluvial deposit adjacent to Rio Bravo Boulevard in Albuquerque, NM. Water containing red dye followed by blue-green dye was ponded in a small horizontal zone ( about 0.5 by 0.5 m) above a vertical outcrop ( about 4 by 2.5 m). The red dye lagged behind the wetting front due to slight adsorption, thus allowing both the wetting front and dye fronts to be observed in time at the outcrop face. After infiltration, vertical slices were excavated to the midpoint of the infiltrometer, exposing the wetting front and dye distribution in a quasi three-dimensional manner. At small scale, wetting front advancement was influenced by the multitude of local capillary barriers within the deposit. However, at the scale of the experiment, the wetting front appeared smooth with significant lateral spreading, twice that in the vertical, indicating a strong anisotropy due to the pronounced horizontal layering. The dye fronts exhibited appreciably more irregularity than the wetting front, as well as the influence of preferential flow ( a fracture) that moved the dye directly to the front, bypassing fresh water between. To illustrate the ability of equivalent homogenous media models to capture the behavior of the wetting front, we performed numerical simulations using equivalent homogeneous media with isotropic, anisotropic, and moisture-dependent anisotropic properties. Those containing anisotropy matched the experimental data best. C1 Sandia Natl Labs, Flow Visualizat & Proc Lab, Albuquerque, NM 87185 USA. Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA. RP Brainard, JR (reprint author), Sandia Natl Labs, Flow Visualizat & Proc Lab, POB 5800, Albuquerque, NM 87185 USA. EM jrbrain@sandia.gov NR 54 TC 16 Z9 23 U1 2 U2 7 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 22 EP 31 PG 10 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300002 ER PT J AU Gee, GW Keller, JM Ward, AL AF Gee, GW Keller, JM Ward, AL TI Measurement and prediction of deep drainage from bare sediments at a semiarid site SO VADOSE ZONE JOURNAL LA English DT Article ID HYDRAULIC CONDUCTIVITY; WATER CONTENTS; HANFORD SITE; RECHARGE; MODEL AB In desert environments, nonvegetated (bare) soils and sediments can act as recharge basins, allowing water infiltration but restricting evaporation. When such sediments are located over buried wastes, drainage can transport vadose zone contamination downward to groundwater. Lysimeters were used to quantify drainage from bare sediments at the U. S. Department of Energy's Hanford Site in Washington state, USA. Drainage varied widely from zero to more than half of the annual for sediments ranging from fine silts to coarse rock fragments Decade-long drainage records were used to develop two empirical models relating annual drainage and textural properties of bare sediments. A 22-yr drainage record for bare, coarse sand was tested, and the calibration developed for the past 10 years (1995-2004) was found to reliably predict drainage from the previous 12 years. The texture models were also compared against Darcy's Law drainage estimates (i.e., unsaturated hydraulic conductivity) for coarse sand and found to outperform Darcy's Law estimates of the long-term drainage average. The texture models reasonably predicted annual drainage rates for bare sediments containing significant fines (materials less than 50 mum), but significantly overpredicted drainage rates for clean rock and gravels with little or no fines. The failure of the textural models with coarse materials containing minimal fines was attributed to advective drying. Drainage predictions using the textural models indicate that to minimize drainage only modest quantities of fines need to be added to the coarse sediments to substantially reduce the potential for groundwater contamination. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Keller, JM (reprint author), Pacific NW Natl Lab, Box 999,K9-36, Richland, WA 99352 USA. EM jason.keller@pnl.gov NR 46 TC 11 Z9 12 U1 1 U2 7 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 32 EP 40 PG 9 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300003 ER PT J AU Scanlon, BR Reedy, RC Keese, KE Dwyer, SF AF Scanlon, BR Reedy, RC Keese, KE Dwyer, SF TI Evaluation of evapotranspirative covers for waste containment in arid and semiarid regions in the southwestern USA SO VADOSE ZONE JOURNAL LA English DT Article ID WATER-BALANCE; CAPILLARY BARRIERS; SOIL-MOISTURE; CAPACITY; DESERT; SITE; FLOW AB Performance evaluation of evapotranspirative (ET) covers is critical for waste containment. The purpose of this study was to evaluate ET covers at sites in Texas and New Mexico representative of arid and semiarid regions in the southwestern USA using water balance monitoring during 4- and 5-yr periods and water balance simulations using short-term (1-5 yr) and long-term (25 yr) climate forcing. Estimated drainage at the Texas site was related to irrigation while measured drainage at the New Mexico site was restricted to the first 2 yr of the 5-yr monitoring period. Evapotranspirative covers work well in these regions because of the dominance of summer (62-80%) that corresponds to periods of highest ET. Strong relationships between decreases in soil water storage and vegetation productivity at both sites underscore the importance of vegetation in controlling the water balance in these systems. Simulations of the Texas site indicate that drainage can occur in response to high precipitation near the end of the growing season, but such drainage can be eliminated with a capillary barrier. Inclusion of a capillary barrier increased available water storage by a factor of about 2.5 at both sites. The capillary barrier effect of drainage lysimeters can result in underestimation of drainage and overestimation of water storage relative to covers not underlain by capillary barriers. The data from this study indicate that a 1-m-thick ET cover underlain by a capillary barrier should be adequate to minimize drainage to less than or equal to1 mm yr(-1) in these arid and semiarid regions. Comprehensive monitoring integrated with modeling is required to assess total system performance to develop a predictive understanding of ET covers. C1 Univ Texas, Jackson Sch Geosci, Bur Econ Geol, Austin, TX 78758 USA. Sandia Natl Labs, US DOE, Albuquerque, NM 87185 USA. RP Scanlon, BR (reprint author), Univ Texas, Jackson Sch Geosci, Bur Econ Geol, Austin, TX 78758 USA. EM bridget.scanlon@beg.utexas.edu RI Scanlon, Bridget/A-3105-2009 OI Scanlon, Bridget/0000-0002-1234-4199 NR 37 TC 48 Z9 51 U1 4 U2 11 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 55 EP 71 PG 17 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300005 ER PT J AU Gee, GW Zhang, ZF Tyler, SW Albright, WH Singleton, MJ AF Gee, GW Zhang, ZF Tyler, SW Albright, WH Singleton, MJ TI Chloride mass balance: Cautions in predicting increased recharge rates SO VADOSE ZONE JOURNAL LA English DT Article ID ENVIRONMENTAL TRACERS; WATER; TRANSPORT; BASIN; ZONE; FLOW AB The chloride mass balance (CMB) method has been used extensively to estimate recharge in arid and semiarid environments. Required data include estimates of annual precipitation, total Cl- input (from dry fallout and precipitation), and pore water Cl- concentrations. Typically, CMB has been used to estimate ancient recharge, but recharge from recent land-use change has also been documented. Recharge rates below a few millimeters per year are reliably detected with CMB; however, estimates above a few millimeters per year appear to be less reliable. We tested the CMB method against 26 yr of drainage from a 7.6-m-deep lysimeter at a simulated waste burial ground located on the Department of Energy's Hanford Site in southeastern Washington, USA where removal of vegetation has increased recharge rates. Measured drainage from the lysimeter for the past 26 yr averaged 62 mm yr(-1). Precipitation averaged 190 mm yr(-1) with an estimated Cl- input of 0.22 mg L-1. Initial pore water Cl- concentration was 88 mg L-1 and decreased to about 6 mg L-1 after 26 yr, while the drainage water Cl- concentration decreased to <1 mg L-1. A recharge estimate made using Cl- concentrations in drain water was within 26% of the measured drainage rate. In contrast, recharge estimates using 1: 1 (water/soil) extracts were lower than actual values by factors ranging from 2 to 8 or more. The results suggest that when recharge is above a few millimeters per year, soil water extracts can lead to unreliable estimates of recharge. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Nevada, Reno, NV 89557 USA. Desert Res Inst, Reno, NV USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Gee, GW (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM glendon.gee@pnl.gov OI Zhang, Fred/0000-0001-8676-6426 NR 29 TC 16 Z9 16 U1 1 U2 13 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 72 EP 78 PG 7 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300006 ER PT J AU Salve, R Hudson, D Liu, HH Wang, JSY AF Salve, R Hudson, D Liu, HH Wang, JSY TI Development of a wet plume following liquid release along a fault SO VADOSE ZONE JOURNAL LA English DT Article ID YUCCA-MOUNTAIN; FLUID-FLOW; UNSATURATED ZONE; CONCEPTUAL-MODEL; SOLUTE TRANSPORT; FRACTURES; SEEPAGE; WATER; TUFF; PERMEABILITY AB To investigate unsaturated flow through a fault located within fractured welded tuff, we performed in situ field experiments in the Exploratory Studies Facility at Yucca Mountain, Nevada. This experiment involved the release of approximately 82 000 L water for a period of 17 mo directly into a near-vertical fault under both constant positive head (at about 0.04 m) and decreasing fluxes. As water was released into the fault, changes in moisture content were monitored in the formation while a large cavity excavated below the test bed was visually inspected for seepage. We observed that water (introduced along the fault) maintained the fault as the primary vertical flowpath, while the adjacent fractured rock served to move water laterally and vertically. Further, unlike primary flowpaths along the fault, flow was not persistent along the secondary flowpaths. While this field experiment provided preliminary insights about the flow field associated with a fault, it also demonstrated the need to investigate the role of infill material and secondary fractures in diverting flow from gravity-driven fast flow toward flowpaths in which lateral flow may occur. C1 Lawrence Berkeley Lab, Berkeley, CA 94707 USA. RP Salve, R (reprint author), Lawrence Berkeley Lab, MS 14R0108, Berkeley, CA 94707 USA. EM R_Salve@lbl.gov NR 40 TC 2 Z9 2 U1 0 U2 1 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 89 EP 100 PG 12 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300008 ER PT J AU Oostrom, M White, MD Lenhard, RJ Van Geel, PJ Wietsma, TW AF Oostrom, M White, MD Lenhard, RJ Van Geel, PJ Wietsma, TW TI A comparison of models describing residual NAPL formation in the vadose zone SO VADOSE ZONE JOURNAL LA English DT Article ID NONAQUEOUS-PHASE LIQUID; GOVERNING MULTIPHASE FLOW; VARIABLY-SATURATED SAND; WET POROUS-MEDIA; HYDRAULIC CONDUCTIVITY; WATER; WETTABILITY; RETENTION; RECOVERY; SOILS AB A major shortcoming of multifluid flow simulators is the inability to predict the retention of nonaqueous phase liquid (NAPL) in the vadose zone after long drainage periods. Recently, three theoretical models - the Wipfler and van der Zee (WVDZ) model; the Van Geel and Roy (VGR) model; and the Lenhard, Oostrom, and Dane (LOD) model - have been proposed for describing residual NAPL formation. The WVDZ model assumes a critical total liquid saturation below all NAPL becomes residual. The VGR and LOD models are extensions of an existing hysteretic relative permeability - saturation capillary pressure model and assume formation of residual NAPL during NAPL drainage and imbibition, respectively. In this study, we compared model predictions against results of a series of static pressure cell experiments. We found no experimental evidence supporting the WVDZ concept of a critical total liquid saturation. The other two models yielded reasonable predictions. The VGR and LOD models then incorporated into a multifluid flow simulator, and simulations of two transient column experiments were conducted. Both models performed considerably better than simulations without considering the formation of residual NAPL, underwriting the importance of incorporating this process in simulators. Although the VGR and LOD models are based on different conceptual models, no clear performance differences could be observed when simulation results were compared against the transient experimental data. C1 Pacific NW Natl Lab, Hydrol Grp, Richland, WA 99352 USA. Idaho Natl Environm & Engn Lab, Idaho Falls, ID 83415 USA. Carleton Univ, Dept Civil & Environm Engn, Ottawa, ON K1S 5B6, Canada. Pacific NW Natl Lab, EMSL, Richland, WA 99352 USA. RP Oostrom, M (reprint author), Pacific NW Natl Lab, Hydrol Grp, POB 999 MS K9-33, Richland, WA 99352 USA. EM mart.oostrom@pnl.gov NR 32 TC 11 Z9 12 U1 0 U2 6 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 1539-1663 J9 VADOSE ZONE J JI Vadose Zone J. PD FEB PY 2005 VL 4 IS 1 BP 163 EP 174 PG 12 WC Environmental Sciences; Soil Science; Water Resources SC Environmental Sciences & Ecology; Agriculture; Water Resources GA 904BE UT WOS:000227469300016 ER PT J AU Bishop, CM Satet, RL Cannon, RM Carter, WC Roosen, AR AF Bishop, CM Satet, RL Cannon, RM Carter, WC Roosen, AR TI A simple model of fully-faceted grain growth and coarsening with non-linear growth laws SO ZEITSCHRIFT FUR METALLKUNDE LA English DT Article ID SILICON-NITRIDE CERAMICS; LIQUID-PHASE; FRACTURE-TOUGHNESS; ALUMINA; MICROSTRUCTURE; KINETICS; SIMULATION; MORPHOLOGY; EVOLUTION; CARBIDE AB A numerical simulation of the growth and coarsening of completely faceted particles in a two-dimensional closed system is described. The particles grow from a supersaturated solution with driving forces including an anisotropic-Gibbs-Thompson effect. Linear and non-linear growth laws were incorporated. This allows comparison to data obtained from physical experiments of Si3N4 growing from a glass matrix with additions of various rare earths (La, Y, Lu) where particle growth is more or less anisotropic (depending on the particular rare earth dopant). Simulations explore the ranges of kinetic parameters for which particle shapes tend to be dictated by thermodynamic and/or kinetic anisotropy. Comparison to data taken from a series of experiments indicates that La probably has a non-linear growth effect whereas Lu is less so. C1 Univ Oxford, Dept Mat, Oxford OX2 3PH, England. MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA. Univ Karlsruhe, Inst Ceram Mech Engn, Karlsruhe, Germany. Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RP Bishop, CM (reprint author), Univ Oxford, Dept Mat, Parks Rd, Oxford OX2 3PH, England. RI Carter, W/K-2406-2012; OI Bishop, Catherine/0000-0002-0001-7115 NR 49 TC 1 Z9 1 U1 0 U2 2 PU CARL HANSER VERLAG PI MUNICH PA KOLBERGERSTRASSE 22, POSTFACH 86 04 20, D-81679 MUNICH, GERMANY SN 0044-3093 J9 Z METALLKD JI Z. Metallk. PD FEB PY 2005 VL 96 IS 2 BP 124 EP 134 PG 11 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 910SM UT WOS:000227952500005 ER PT J AU Cui, H Yang, X Baylor, LR Lowndes, DH AF Cui, H Yang, X Baylor, LR Lowndes, DH TI Growth of multiwalled-carbon nanotubes using vertically aligned carbon nanofibers as templates/scaffolds and improved field-emission properties SO APPLIED PHYSICS LETTERS LA English DT Article ID PROBE MICROSCOPY TIPS; LOCALIZED STATES; EMITTERS AB Multiwalled-carbon nanotubes (MWCNTs) are grown on top of vertically aligned carbon nanofibers (VACNFs) via microwave plasma-enhanced chemical vapor deposition (MPECVD). The VACNFs are first grown in a direct-current plasma-enhanced chemical vapor deposition reactor using nickel catalyst. A layer of carbon-silicon materials is then deposited on the VACNFs and the nickel catalyst particle is broken down into smaller nanoparticles during an intermediate reactive-ion-plasma deposition step. These nickel nanoparticles nucleate and grow MWCNTs in the following MPECVD process. Movable-probe measurements show that the MWCNTs have greatly improved field-emission properties relative to the VACNFs. (C) 2005 American Institute of Physics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. RP Cui, H (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM cui@ornl.gov NR 22 TC 9 Z9 9 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 31 PY 2005 VL 86 IS 5 AR 053110 DI 10.1063/1.1852730 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700049 ER PT J AU Ding, Y Xu, J Prewitt, CT Hemley, RJ Mao, HK Cowan, JA Zhang, JZ Qian, J Vogel, SC Lokshin, K Zhao, YS AF Ding, Y Xu, J Prewitt, CT Hemley, RJ Mao, HK Cowan, JA Zhang, JZ Qian, J Vogel, SC Lokshin, K Zhao, YS TI Variable pressure-temperature neutron diffraction of wustite (Fe1-xO): Absence of long-range magnetic order to 20 GPa SO APPLIED PHYSICS LETTERS LA English DT Article ID MOSSBAUER-SPECTROSCOPY; MOISSANITE ANVILS; FERROUS OXIDE; COMPRESSION; COLLAPSE; CELL; FEO; COO AB Neutron diffraction measurements have been performed on polycrystalline Fe1-xO (wustite) up to 20.3 GPa using a large-volume moissanite anvil cell at room temperature to examine the existence of long-range magnetic ordering in the high-pressure rhombohedral phase of the material. This investigation is crucial for understanding the nature of high-pressure phase transitions in Fe1-xO. Low temperature ambient pressure neutron diffraction measurements on the same sample were also conducted at 190, 180, and 85 K to compare with the high-pressure results. Magnetic peaks are expected to be observed under pressure similar to those at 180 K at ambient pressure. However, no magnetic peaks were evident in the high-pressure diffraction patterns (to 20.3 GPa at 300 K). The absence of magnetic peaks indicates the absence of long-range magnetic order in Fe1-xO under these conditions. This result indicates the need to reconsider the interpretation of high-pressure Mossbauer studies and the mechanism of the high-pressure phase transitions in Fe1-xO. (C) 2005 American Institute of Physics. C1 Argonne Natl Lab, Adv Photon Source, HPCAT, Carnegie Inst Washington, Argonne, IL 60439 USA. Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, HIPD, Argonne, IL 60439 USA. Los Alamos Natl Lab, LANSCE, Los Alamos, NM 87545 USA. RP Ding, Y (reprint author), Argonne Natl Lab, Adv Photon Source, HPCAT, Carnegie Inst Washington, Bld 434E,9700 S Cass Ave, Argonne, IL 60439 USA. EM yding@hpcat.aps.anl.gov RI Lujan Center, LANL/G-4896-2012; Ding, Yang/K-1995-2014 OI Ding, Yang/0000-0002-8845-4618 NR 24 TC 19 Z9 19 U1 1 U2 14 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 JAN 31 PY 2005 VL 86 IS 5 AR 052505 DI 10.1063/1.1852075 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700036 ER PT J AU Gibson, GA Chaiken, A Nauka, K Yang, CC Davidson, R Holden, A Bicknell, R Yeh, BS Chen, J Liao, H Subramanian, S Schut, D Jasinski, J Liliental-Weber, Z AF Gibson, GA Chaiken, A Nauka, K Yang, CC Davidson, R Holden, A Bicknell, R Yeh, BS Chen, J Liao, H Subramanian, S Schut, D Jasinski, J Liliental-Weber, Z TI Phase-change recording medium that enables ultrahigh-density electron-beam data storage SO APPLIED PHYSICS LETTERS LA English DT Article ID ATOMIC-FORCE MICROSCOPE; COMPLEX AB An ultrahigh-density electron-beam-based data storage medium is described that consists of a diode formed by growing an InSe/GaSe phase-change bilayer film epitaxially on silicon. Bits are recorded as amorphous regions in the InSe layer and are detected via the current induced in the diode by a scanned electron beam. This signal current is modulated by differences in the electrical properties of the amorphous and crystalline states. The success of this recording scheme results from the remarkable ability of layered III-VI materials, such as InSe, to maintain useful electrical properties at their surfaces after repeated cycles of amorphization and recrystallization. (C) 2005 American Institute of Physics. C1 Hewlett Packard Labs, Palo Alto, CA 94304 USA. Hewlett Packard Imaging & Printing Grp, Corvallis, OR 97330 USA. Lawrence Berkeley Lab, MSD, Berkeley, CA 94720 USA. RP Gibson, GA (reprint author), Hewlett Packard Labs, 1501 Page Mill Rd, Palo Alto, CA 94304 USA. EM gary.gibson@hp.com RI Liliental-Weber, Zuzanna/H-8006-2012 NR 20 TC 32 Z9 32 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 31 PY 2005 VL 86 IS 5 AR 051902 DI 10.1063/1.1856690 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700015 ER PT J AU Kim, SK Lee, KS Kang, BW Lee, KJ Kortright, JB AF Kim, SK Lee, KS Kang, BW Lee, KJ Kortright, JB TI Vortex-antivortex assisted magnetization dynamics in a semi-continuous thin-film model system studied by micromagnetic simulations SO APPLIED PHYSICS LETTERS LA English DT Article AB We have studied magnetization M dynamics in a sernicontinuous 33-nm-thick Fe model system, which approaches new equilibrium states under various magnetic fields, H=0, -1, -10, and -30 Oe, starting from an initial M configuration of complex microstructures experimentally observed in a real continuous Fe film. Simulation results with H=0 clearly reveal that small needle-shaped domains and ripple structures found in a frozen state of the demagnetized Fe film continue to grow far into a surrounding 180degrees domain, and that zigzag folding structures appear through the M dynamic evolution assisted by vortex and antivortex. Furthermore, it is found that many domain walls of a cross-tie type exhibit their dynamic developments under H=-10 and -30 Oe, caused by interactions between vortex and antivortex states. This vortex-antivortex assisted M dynamic evolution offers deeper insights into the comprehensive understanding of the static or dynamic properties of M reversal processes as well as additional features or more details of magnetic microstructures in real continuous films. (C) 2005 American Institute of Physics. C1 Seoul Natl Univ, Coll Engn, Sch Mat Sci & Engn, Nanospintron Lab, Seoul 151744, South Korea. CEA, DRFMC, SPINTEC, F-38054 Grenoble 9, France. LBNL, Div Sci Mat, Berkeley, CA USA. RP Kim, SK (reprint author), Seoul Natl Univ, Coll Engn, Sch Mat Sci & Engn, Nanospintron Lab, Seoul 151744, South Korea. EM sangkoog@snu.ac.kr RI Lee, Kyung-Jin/B-4431-2010; Kim, Sang-Koog/J-4638-2014 OI Lee, Kyung-Jin/0000-0001-6269-2266; NR 8 TC 15 Z9 15 U1 0 U2 4 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 JAN 31 PY 2005 VL 86 IS 5 AR 052504 DI 10.1063/1.1855413 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700035 ER PT J AU Mitlin, D Schmid, AK Radmilovic, V AF Mitlin, D Schmid, AK Radmilovic, V TI Transmission electron microscopy based study of epitaxy in Nb/(100)Cu bilayer and Cu/Nb/(100)Cu trilayer nanoscale films SO APPLIED PHYSICS LETTERS LA English DT Article ID HIGH-STRENGTH; CU; COMPOSITES; MULTILAYERS AB We used transmission electron microscopy to detail the structure of Nb/Cu(100) thin films and Cu/Nb/Cu(100) trilayers grown by physical vapor deposition. The two dominant orientation relationships that exist between the Nb and the Cu are the Bain and the Kurdjumov-Sachs (K-S). However, there is an angular spread in these orientations, which is evident in the selected-area diffraction patterns and in the high-resolution transmission electron microscope images. The first several monolayers of Nb maintain a Bain orientation relationship with the Cu substrate. As the overlayer thickness increases, the Nb grains begin to tilt away from the Bain orientation, around the [010] Cu direction, creating a "domino-like" microstructure. This tilting is associated with the presence of dislocations in the Nb, with the projection of their Burgers vector perpendicular to the Nb/Cu interface. The dislocations are located several monolayers offset from the interface. The K-S grains are observed to heterogeneously nucleate near the dislocation cores. Surprisingly, when Cu is deposited to cap the Nb films, the overlayer grows as a single crystal in a Bain orientation with the underlying Nb, essentially ignoring the K-S oriented grains. (C) 2005 American Institute of Physics. C1 Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. RP Mitlin, D (reprint author), Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada. EM dmitlin@ualberta.ca RI Mitlin , David /M-5328-2016 OI Mitlin , David /0000-0002-7556-3575 NR 17 TC 1 Z9 1 U1 0 U2 9 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 JAN 31 PY 2005 VL 86 IS 5 AR 051904 DI 10.1063/1.1851095 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700017 ER PT J AU Young, DL Crandall, RS AF Young, DL Crandall, RS TI An electrostatic barrier to trap filling in CuIn1-xGaxSe2 (vol 83 pg 2363, 2003) SO APPLIED PHYSICS LETTERS LA English DT Correction C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Young, DL (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 1 TC 1 Z9 1 U1 1 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 31 PY 2005 VL 86 IS 5 AR 059901 DI 10.1063/1.1856693 PG 1 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700067 ER PT J AU Yuzvinsky, TD Fennimore, AM Mickelson, W Esquivias, C Zettl, A AF Yuzvinsky, TD Fennimore, AM Mickelson, W Esquivias, C Zettl, A TI Precision cutting of nanotubes with a low-energy electron beam SO APPLIED PHYSICS LETTERS LA English DT Article ID CARBON NANOTUBES; IRRADIATION; MICROSCOPE AB We report on a method to locally remove material from carbon and boron nitride nanotubes using the low-energy focused electron beam of a scanning electron microscope. Using this method, clean precise cuts can be made into nanotubes, either part-way through (creating hingelike geometries) or fully through (creating size-selected nanotube segments). This cutting mechanism involves foreign molecular species and differs from electron-beam-induced knock-on damage in transmission electron microscopy. (C) 2005 American Institute of Physics. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Yuzvinsky, TD (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM azettl@physics.berkeley.edu RI Mickelson, Willi/D-8813-2013; Zettl, Alex/O-4925-2016 OI Mickelson, Willi/0000-0002-6398-6212; Zettl, Alex/0000-0001-6330-136X NR 19 TC 114 Z9 117 U1 1 U2 11 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 JAN 31 PY 2005 VL 86 IS 5 AR 053109 DI 10.1063/1.1857081 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700048 ER PT J AU Zaitseva, N Harper, J Gerion, D Saw, C AF Zaitseva, N Harper, J Gerion, D Saw, C TI Unseeded growth of germanium nanowires by vapor-liquid-solid mechanism SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON WHISKERS; CRYSTAL GROWTH; NANOCRYSTALS AB Single-crystal germanium nanowires have been synthesized in the temperature range 380-430degreesC without the use of any metal catalysts. Tetraethylgermane was used as a precursor in combination with different organic solvents to produce nanowires with controlled diameter ranging from 5 nm to 700 nm. The growth direction of nanowires is along <011> direction. The method is based on the vapor-liquid-solid mechanism, with the classical liquid-metal catalyst replaced by droplets of high-boiling-point hydrocarbons. (C) 2005 American Institute of Physics. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Zaitseva, N (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM zaitseva1@llnl.gov NR 20 TC 21 Z9 21 U1 0 U2 6 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 JAN 31 PY 2005 VL 86 IS 5 AR 053105 DI 10.1063/1.1856695 PG 3 WC Physics, Applied SC Physics GA 899LA UT WOS:000227144700044 ER PT J AU Chacko, Z Fox, PJ Murayama, H AF Chacko, Z Fox, PJ Murayama, H TI Localized supersoft supersymmetry breaking SO NUCLEAR PHYSICS B LA English DT Article ID RENORMALIZATION; MODEL; RS1 AB We consider supersymmetry breaking models in which the MSSM is extended to include an additional chiral adjoint field for each gauge group with which the MSSM gauginos acquire Dirac masses. We investigate a framework in which the Standard Model gauge fields propagate in the bulk of a warped extra dimension while quarks and leptons are localized on the ultraviolet brane. The adjoint fields are localized on the infrared brane, where supersymmetry is broken in a hidden sector. This setup naturally suppresses potentially large flavor violating effects, while allowing perturbative gauge coupling unification under SU(5) to be realized. The Standard Model superpartner masses exhibit a supersoft spectrum. Since the soft scalar masses are generated at very low scales of order the gaugino masses these models are significantly less fine-tuned than other supersymmetric models. The LSP in this class of models is the gravitino, while the NLSP is the stau. We show that this theory has an approximate R-symmetry under which the gauginos are charged. This symmetry allows several possibilities for experimentally distinguishing the Dirac nature of the gauginos. (C) 2004 Elsevier B.V All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA. Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA. RP Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM pjfox@scipp.ucsc.edu RI Murayama, Hitoshi/A-4286-2011 NR 50 TC 44 Z9 44 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN 31 PY 2005 VL 706 IS 1-2 BP 53 EP 70 DI 10.1016/j.nuclphysb.2004.11.021 PG 18 WC Physics, Particles & Fields SC Physics GA 887QS UT WOS:000226321200002 ER PT J AU Harnik, R Larson, DT Murayama, H Thormeier, M AF Harnik, R Larson, DT Murayama, H Thormeier, M TI Probing the Planck scale with proton decay SO NUCLEAR PHYSICS B LA English DT Article ID STRING WORLD SHEET; YUKAWA TEXTURES; MU-PROBLEM; D-TERMS; QUARK; UNIFICATION; VIOLATION; SYMMETRY; MODELS; MASSES AB We advocate the idea that proton decay may probe physics at the Planck scale instead of the GUT scale. This is possible because supersymmetric theories have dimension-5 operators that can induce proton decay at dangerous rates, even with R-parity conservation. These operators are expected to be suppressed by the same physics that explains the fermion masses and mixings. We present a thorough analysis of nucleon partial lifetimes in models with a string-inspired anomalous U(1)X family symmetry which is responsible for the fermionic mass spectrum as well as forbidding R-parity violating interactions. Protons and neutrons can decay via R-parity conserving non-renormalizable superpotential terms that are suppressed by the Planck scale and powers of the Cabibbo angle. Many of the models naturally lead to nucleon decay near present limits without any reference to grand unification. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Inst Adv Study, Princeton, NJ 08540 USA. RP Harnik, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. EM roni@socrates.berkeley.edu; dtlarson@socrates.berkeley.edu; murayama@ias.edu; thor@th.physik.uni-bonn.de RI Murayama, Hitoshi/A-4286-2011 NR 36 TC 37 Z9 37 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 JAN 31 PY 2005 VL 706 IS 1-2 BP 372 EP 390 DI 10.1016/j.nuclphysb.2004.11.010 PG 19 WC Physics, Particles & Fields SC Physics GA 887QS UT WOS:000226321200012 ER PT J AU Errandonea, D Meng, Y Somayazulu, M Hausermann, D AF Errandonea, D Meng, Y Somayazulu, M Hausermann, D TI Pressure-induced alpha ->omega transition in titanium metal: a systematic study of the effects of uniaxial stress SO PHYSICA B-CONDENSED MATTER LA English DT Article DE titanium; high pressure; phase transformations ID DIAMOND-ANVIL CELL; X-RAY-DIFFRACTION; CRYSTAL-STRUCTURES; MEGABAR PRESSURES; OMEGA-PHASE; TRANSFORMATION; ZIRCONIUM; COMPRESSION; TI; GPA AB The effects of uniaxial stress on the pressure-induced alpha --> omega transition in pure titanium (Ti) are investigated by means of angle dispersive X-ray diffraction in a diamond-anvil cell. Experiments under four different pressure environments reveal that: (1) the onset of the transition depends on the pressure medium used, going from 4.9 GPa (no pressure medium) to 10.5 GPa (argon pressure medium); (2) the alpha and omega phases coexist over a rather large pressure range, which depends on the pressure medium employed; (3) the hysteresis and quenchability of the omega phase is affected by differences in the sample pressure environment; and (4) a short-term laser heating of Ti lowers the alpha --> omega transition pressure. Possible transition mechanisms are discussed in the light of the present results, which clearly demonstrate the influence of uniaxial stress in the alpha --> omega transition. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Valencia, ICMUV, Dept Fis Aplicada, E-46100 Burjassot, Valencia, Spain. Carnegie Inst Washington, Argonne Natl Lab, HPCAT, Argonne, IL 60439 USA. RP Errandonea, D (reprint author), Univ Valencia, ICMUV, Dept Fis Aplicada, C Dr Moliner 50, E-46100 Burjassot, Valencia, Spain. EM daniel.errandonea@uv.es RI Errandonea, Daniel/J-7695-2016 OI Errandonea, Daniel/0000-0003-0189-4221 NR 39 TC 195 Z9 197 U1 6 U2 50 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JAN 31 PY 2005 VL 355 IS 1-4 BP 116 EP 125 DI 10.1016/j.physb.2004.10.030 PG 10 WC Physics, Condensed Matter SC Physics GA 893QC UT WOS:000226733300016 ER PT J AU Yamahara, K Jacobson, CP Visco, SJ Zhang, XF de Jonghe, LC AF Yamahara, K Jacobson, CP Visco, SJ Zhang, XF de Jonghe, LC TI Thin film SOFCs with cobalt-infiltrated cathodes SO SOLID STATE IONICS LA English DT Article DE solid oxide fuel cells; reduced temperature SOFCs; scandia-stabilized zirconia; colloidal deposition; cobalt doping ID SUPPORTED ZR(SC)O-2 SOFCS; CONDUCTIVITY; ELECTROLYTE; SYSTEM AB Anode-supported SYSZ [i.e., (Sc2O3)(0.1)(Y2O3)(0.01)(ZrO2)(0.89)] thin-film solid oxide fuel cells were evaluated between 650 and 800 degreesC. Peak power densities and power densities at cell voltages of 0.7 V were 320 and 190 mW/cm(2), respectively, at 650 degreesC, denoted as 320/190/650. Corresponding power densities at other temperature were 1400/1100/800, 990/640/750, and 600/360/700. At 750 degreesC and lower, the power densities and ASRs (area-specific resistances) were better than those reported for an 8YSZ cell with record performance [S. de Souza, S.J. Visco, L.C. De Jonghe, in Proceeding of the Second European Solid Oxide Fuel Cell Forum, edited by B. Thorstensen, vol. 2 (1996), 677.], while showing a smaller temperature dependence. Further performance improvements of about a factor of 2 were obtained at 650 degreesC after infiltration of the LSM/YSZ cathodes with a cobalt solution. This improvement persisted up to about 750 degreesC, being more pronounced at the lower temperatures. The results indicate the potential benefit of cobalt infiltration for reduced temperature SOFCs. AC measurements revealed that the majority of effect resulted from a decrease in the non-ohmic resistance of the cathode. TEM observations found similar to25 nm Co3O4 particles in the pores of the modified LSM-composite cathodes. The AC impedance response following cobalt infiltration indicates a decrease of the effective charge transfer resistance. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Yamahara, K (reprint author), Mitsubishi Chem Corp, Minato Ku, 33-8 Shiba 5 Chome, Tokyo 1080014, Japan. EM 3002202@cc.m-kagaku.co.jp NR 13 TC 68 Z9 74 U1 4 U2 19 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 JAN 31 PY 2005 VL 176 IS 3-4 BP 275 EP 279 DI 10.1016/j.ssi.2004.08.017 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 895OM UT WOS:000226872700006 ER PT J AU Katikaneni, SP Gaffney, AM Ahmed, S Song, CS AF Katikaneni, SP Gaffney, AM Ahmed, S Song, CS TI Recent advances in fuel processing catalysts for fuel cell applications - Preface SO CATALYSIS TODAY LA English DT Editorial Material C1 Fuel Cell Energy, Fuel Proc Grp, Danbury, CT 06813 USA. Rohm & Haas Co, Spring House, PA 19477 USA. Argonne Natl Lab, Div Chem Engn, Electrochem Technol Program, Argonne, IL 60439 USA. Penn State Univ, Energy Inst, Dept Energy & Geoenvironm Engn, University Pk, PA 16802 USA. Penn State Univ, Energy Inst, Clean Fuels & Catalysis Program, University Pk, PA 16802 USA. RP Katikaneni, SP (reprint author), Fuel Cell Energy, Fuel Proc Grp, Danbury, CT 06813 USA. EM skatikaneni@fce.com; Anne_Gaffney@RohmHaas.com; sahmed@cmt.anl; csong@psu.edu RI Song, Chunshan/B-3524-2008 OI Song, Chunshan/0000-0003-2344-9911 NR 0 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD JAN 30 PY 2005 VL 99 IS 3-4 BP 255 EP 256 DI 10.1016/j.cattod.2004.10.001 PG 2 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 912XY UT WOS:000228114400001 ER PT J AU Choung, SY Ferrandon, M Krause, T AF Choung, SY Ferrandon, M Krause, T TI Pt-Re bimetallic supported on CeO2-ZrO2 mixed oxides as water-gas shift catalysts SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT Symposium on Fuel Processing Catalysts for Fuel Cell Applications CY SEP 07-11, 2003 CL New York, NY ID PEM FUEL-CELL; HYDROGEN; PD AB The addition of Re to Pt/Ce0.46Zr0.54O2 was shown to enhance the water-gas shift (WGS) rate compared with the rate observed with Pt alone supported on either Ce0.46Zr0.54O2 or Ce0.6Zr0.4O2 at similar Pt weight loadings. The results from CO chemisorption showed that the Pt was more highly dispersed on Pt-Re/Ce0.46Zr0.54O2 than on the Pt/Ce0.46Zr0.54O2 or Pt/Ce0.6Zr0.4O2. Based on this Pt dispersion, the exposed Pt surface area was calculated for Pt-Re/Ce0.46Zr0.54O2, Pt/Ce0.46Zr0.54O2 and Pt/Ce0.6Zr0.4O2. The WGS rate was observed to be proportional to the exposed Pt surface area for the Pt-Re and Pt catalysts; however, the rate per m 2 of exposed Pt for Pt-Re/Ce0.46Zr0.54O2 was higher than that of Pt/Ce0.46Zr0.54O2 or Pt/Ce0.6Zr0.4O2. The difference in the rates upon the addition of Re to Pt WGS catalysts suggests that the role of Re in enhancing the WGS activity of Pt is more complex than to just increase the Pt dispersion. (c) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, Electrochem Technol Program, Div Chem Engn, Argonne, IL 60439 USA. RP Krause, T (reprint author), Argonne Natl Lab, Electrochem Technol Program, Div Chem Engn, 9700 S Cass Ave, Argonne, IL 60439 USA. EM krause@cmt.anl.gov NR 20 TC 69 Z9 69 U1 5 U2 27 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD JAN 30 PY 2005 VL 99 IS 3-4 BP 257 EP 262 DI 10.1016/j.cattod.2004.10.002 PG 6 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 912XY UT WOS:000228114400002 ER PT J AU Borup, RL Inbody, MA Semelsberger, TA Tafoya, JI Guidry, DR AF Borup, RL Inbody, MA Semelsberger, TA Tafoya, JI Guidry, DR TI Fuel composition effects on transportation fuel cell reforming SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT Symposium on Fuel Processing Catalysts for Fuel Cell Applications CY SEP 07-11, 2003 CL New York, NY DE fuel processing; fuel cells; hydrogen production; fuel composition; carbon formation AB This work examines the effect of various hydrocarbons on fuel processor light-off and reforming. Major hydrocarbon fuel constituents, such as aliphatic compounds. napthanes, and aromatics have been compared with the fuel processing performance of blended fuel components and reformulated gasoline to examine synergistic or detrimental effects the fuel components have in a real fuel blend. Short chained aliphatic hydrocarbons tend to have favorable light-off and reforming characteristics for catalytic autothermal reforming compared with longer-chained and aromatic components. Oxygenated hydrocarbons have lower light-off requirements than do pure hydrocarbons. Gas phase oxidation favors higher cetane # fuels, which tend to be longer chained hydrocarbons. Energy consumption during the start-up process shows a large fuel effect. Methanol and dimethylether (DME) show lower start-up energy demands for the fuel processor start-up than do high temperature reforming hydrocarbon fuels such as methane, gasoline and ethanol. Aromatics and longer chained hydrocarbons show a higher tendency for carbon formation, increasing the amount of carbon formed during the light-off phase while the addition of oxygenates tends to lower the carbon formed during the start-up process. (c) 2004 Elsevier B.V. All rights reserved. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Borup, RL (reprint author), Los Alamos Natl Lab, MST-11,MS J579,POB 1663, Los Alamos, NM 87545 USA. EM borup@lanl.gov NR 12 TC 37 Z9 37 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD JAN 30 PY 2005 VL 99 IS 3-4 BP 263 EP 270 DI 10.1016/j.cattod.2005.10.014 PG 8 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 912XY UT WOS:000228114400003 ER PT J AU Ahluwalia, RK Zhang, QZ Chmielewski, DJ Lauzze, KC Inbody, MA AF Ahluwalia, RK Zhang, QZ Chmielewski, DJ Lauzze, KC Inbody, MA TI Performance of CO preferential oxidation reactor with noble-metal catalyst coated on ceramic monolith for on-board fuel processing applications SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT Symposium on Fuel Processing Catalysts for Fuel Cell Applications CY SEP 07-11, 2003 CL New York, NY DE CO oxidation; PEMFC; preferential oxidation AB On-board fuel processors are being developed to provide hydrogen-rich gas to the polymer electrolyte fuel cell automotive propulsion systems. Whereas the anode catalyst in the fuel cell has low tolerance for carbon monoxide, 10-100 ppm, reforming of gasoline and other hydrocarbon fuels generally produces 1-2% of CO. Of the many methods of removing CO from the reformer gas, preferential oxidation (PrOx) of CO over noble-metal catalysts is practiced most frequently. In this paper, we present experimental data for CO conversion on a Pt-based catalyst that is active at room temperature and was coated on a ceramic monolith. The data is used to develop an empirical correlation for selectivity for CO oxidation as a function of CO concentration and oxygen stoichiometry at 30,000-80,000/h space velocity. The selectivity correlation is used in a model to analyze the performance of multi-stage, adiabatic PrOx reactors with heat exchange between the stages to cool the reformate to 100 degrees C. An optimization algorithm is used to determine the operating conditions that can reduce CO concentration to 10 ppm while minimizing parasitic loss of H-2 in the reformate stream. It is found that the 10 ppm constraint limits the maximum inlet CO concentration to 1.05% in a single-stage reactor and to 3.1% in a two-stage reactor. The results clearly show the incremental reduction in parasitic H-2 loss by addition of second and third stages. (c) 2004 Elsevier B.V. All rights reserved. C1 Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA. IIT, Dept Environm Chem & Engn, Chicago, IL 60616 USA. Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Ahluwalia, RK (reprint author), Argonne Natl Lab, Nucl Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM walia@anl.gov NR 12 TC 40 Z9 42 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD JAN 30 PY 2005 VL 99 IS 3-4 BP 271 EP 283 DI 10.1016/j.cattod.20047.10.015 PG 13 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 912XY UT WOS:000228114400004 ER PT J AU Alfonso, DR Cugini, AV Sorescu, DC AF Alfonso, DR Cugini, AV Sorescu, DC TI Adsorption and decomposition of H2S on Pd(111) surface: a first-principles study SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT Symposium on Fuel Processing Catalysts for Fuel Cell Applications CY SEP 07-11, 2003 CL New York, NY DE density functional calculations; dissociative adsorption; chemisorption; palladium; hydrogen sulfide; sulfuhydryl species (SH); sulfur; metallic surface; low index single crystal surface ID GENERALIZED GRADIENT APPROXIMATION; ENERGY ELECTRON-DIFFRACTION; DENSITY-FUNCTIONAL THEORY; HYDROGEN DESORPTION; ADSORBATE STRUCTURE; SULFUR; PALLADIUM; PD; METALS; PSEUDOPOTENTIALS AB Gradient-corrected density functional theory was used to investigate the adsorption of H2S on Pd(1 1 1) surface. Molecular adsorption was found to be stable with H2S binding preferentially at top sites. In addition, the adsorption of other S moieties (SH and S) was investigated. SH and S were found to be preferentially bind at the bridge and fcc sites, respectively. The reaction pathways and energy profiles for H2S decomposition giving rise to adsorbed S and H were determined. Both H2S(ad) -> SH(ad) + H-(ad) and SH(ad) -> S-(ad) + H-(ad) reactions were found to have low barriers and high exothermicities. This reveals that the decomposition of H2S on Pd(1 1 1) surface is a facile process. (c) 2004 Elsevier B.V. All rights reserved. C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. Parsons Project Serv Inc, South Pk, PA 15129 USA. RP Alfonso, DR (reprint author), US DOE, Natl Energy Technol Lab, POB 10940,626 Cochrans Mill Rd, Pittsburgh, PA 15236 USA. EM alfonso@netl.doe.gov NR 39 TC 50 Z9 50 U1 1 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD JAN 30 PY 2005 VL 99 IS 3-4 BP 315 EP 322 DI 10.1016/j.cattod.2004.10.006 PG 8 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA 912XY UT WOS:000228114400009 ER PT J AU Chen, WYC Torney, DC AF Chen, WYC Torney, DC TI Equivalence classes of matchings and lattice-square designs SO DISCRETE APPLIED MATHEMATICS LA English DT Article DE collineation; combinatorial enumeration; design isomorphism; dihedral group; equivalence class; finite field; group action; hyperoctahedral group; isomorphism group; linear algebra; semidirect product; spread AB We enumerate nonisomorphic lattice-square designs yielded by a conventional construction. Constructed designs are specified by words composed from finite-field elements. These words are permuted by the isomorphism group in question. The latter group contains a direct-product subgroup, acting, respectively, upon the positions and identities of the finite-field elements. We review enumeration theory for such direct-product groups. This subgroup is a direct product of a hyperoctahedral and a dihedral group, with the orbits of the hyperoctahedral group, acting on the positions of the field elements, interpretable as perfect matchings. Thus, the enumeration of dihedral equivalence classes of perfect matchings provides an upper bound on the number of nonisomorphic, constructed designs. The full isomorphism group also contains non-direct-product elements, and the isomorphism classes are enumerated using Burnside's Lemma: counting the number of orbits of a normal subgroup fixed by the quotient group. This approach is applied to constructed lattice-square designs of odd, prime-power order less than or equal to 13. (C) 2004 Elsevier B.V. All rights reserved. C1 Nankai Univ, LPMC, Ctr Combinator, Tianjin 300071, Peoples R China. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Chen, WYC (reprint author), Nankai Univ, LPMC, Ctr Combinator, Tianjin 300071, Peoples R China. EM chen@nankai.edu.cn; dct@lanl.gov NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD JAN 30 PY 2005 VL 145 IS 3 BP 349 EP 357 DI 10.1016/j.dam.2004.02.013 PG 9 WC Mathematics, Applied SC Mathematics GA 889OR UT WOS:000226452800003 ER PT J AU Bein, W Brucker, P Larmore, LL Park, JK AF Bein, W Brucker, P Larmore, LL Park, JK TI The algebraic Monge property and path problems SO DISCRETE APPLIED MATHEMATICS LA English DT Article DE Monge property; algebraic Monge matrices; bottleneck shortest path problems; combinatorial optimization ID WEIGHT SUBSEQUENCE PROBLEM; OPTIMIZATION; MATRICES AB We give algorithmic results for combinatorial problems with cost arrays possessing certain algebraic Monge properties. We extend Monge-array results for two shortest path problems to a general algebraic setting, with values in an ordered commutative semigroup, if the semigroup operator is strictly compatible with the order relation. We show how our algorithms can be modified to solve bottleneck shortest path problems, even though strict compatibility does not hold in that case. For example, we give a linear time algorithm for the unrestricted shortest path bottleneck problem on n nodes, also O(kn) and O(n(3/2) log(5/2) n) time algorithms for the k-shortest path bottleneck problem. (C) 2004 Elsevier B.V. All rights reserved. C1 Univ Nevada, Sch Comp Sci, Las Vegas, NV 89154 USA. Univ Osnabruck, Fachbereich Math Informat, D-49069 Osnabruck, Germany. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Bein, W (reprint author), Univ Nevada, Sch Comp Sci, 4505 Marlyand Pkwy, Las Vegas, NV 89154 USA. EM bein@cs.unlv.edu NR 17 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD JAN 30 PY 2005 VL 145 IS 3 BP 455 EP 464 DI 10.1016/j.dam.2004.06.001 PG 10 WC Mathematics, Applied SC Mathematics GA 889OR UT WOS:000226452800013 ER PT J AU Weygand, DP AF Weygand, DP CA CLAS Collaboration TI Hadron spectroscopy at CLAS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article; Proceedings Paper CT 8th International Workshop on Meson Production, Properties and Interaction (MESON 2004) CY JUN 04-08, 2004 CL Krakow, POLAND SP Jagiellonian Univ, Inst Phys, Forschungszentrum, INFN-LNF, Polish Minist Natl Educ & Sport DE meson; pentaquark; hadron structure ID FLUX-TUBE MODEL; HYBRID MESONS; QCD; REST AB Meson photoproduction was studied at the CEBAF Large Acceptance Spectrometer (CLAS) utilizing a 5.5 GeV/c photon beam incident on a hydrogen target. Here we report on the partial wave analyzes (PWA) performed on the exclusive final states pi(+)pi(+)pi(-)n and K(+)K(-)pi(+)n. In addition, CLAS has data on the final state pi(+)pi(0)pi(-)p which will be reported in the near future. The analysis of the pi(+)pi(+)pi(-) system shows clearly the a(2) (1320), as well as evidence for the a(1) (1260) and the pi(2) (1670). The pi(1) (1600), previously observed in pi(-)p interactions, is seen very weakly here. In the K(+)K(-)pi(+)n channel there is is evidence for the Theta(+) (1540) S = +1 baryon pentaquark. The PWA of this system gives an excellent description of the background which rules out mesonic reflection as a source of the signal. C1 Thomas Jefferson Natl Accelerator Fac, Newport News, VA 23606 USA. RP Weygand, DP (reprint author), Thomas Jefferson Natl Accelerator Fac, Newport News, VA 23606 USA. NR 27 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD JAN 30 PY 2005 VL 20 IS 2-3 BP 407 EP 416 DI 10.1142/S0217751X05021579 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 908OW UT WOS:000227797700023 ER PT J AU Kuprin, A Hasan, Z Chuang, YD Hussain, Z Qian, D Foo, M Cava, RJ AF Kuprin, A Hasan, Z Chuang, YD Hussain, Z Qian, D Foo, M Cava, RJ TI Angle-resolved photoemission spectroscopy (ARPES) of Na0.7CoO2 SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT 5th International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials CY JUN 11-16, 2004 CL Chongqing, PEOPLES R CHINA DE cobalt oxyhydrates; Mott insulator; electron correlations; photoelectron spectroscopy ID SUPERCONDUCTIVITY; NACO2O4 AB Detailed study of the electronic structure of the layered Na0.7CoO2, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p &RARR; 3d excitations indicates large on-site Hubbard-U &SIM; 5 eV. A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t < 10 meV. This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K. C1 Princeton Univ, Dept Phys, Joseph Henry Labs, Princeton, NJ 08544 USA. Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. Princeton Mat Inst, Princeton Ctr Copplex Mat, Princeton, NJ 08544 USA. Princeton Univ, Dept Chem, Princeton, NJ 08544 USA. RP Kuprin, A (reprint author), Princeton Univ, Dept Phys, Joseph Henry Labs, Princeton, NJ 08544 USA. EM apkouprine@lbl.gov; mzhasan@princeton.edu NR 17 TC 0 Z9 0 U1 1 U2 5 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD JAN 30 PY 2005 VL 19 IS 1-3 SI SI BP 345 EP 351 DI 10.1142/S0217979205028554 PN 1 PG 7 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 919RL UT WOS:000228635200073 ER PT J AU Bonca, J Batista, CD Gubernatis, JE Lin, HQ AF Bonca, J Batista, CD Gubernatis, JE Lin, HQ TI Electronically driven ferroelectricity in the extended Falicov-Kimball model SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT 5th International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials CY JUN 11-16, 2004 CL Chongqing, PEOPLES R CHINA DE electron correlations; ferroelectricity AB We calculate the quantum phase diagram of an extended Falicov-Kimball model in the intermediate coupling regime using a constrained path quantum Monte Carlo technique. The mixed-valence regime is dominated by a Bose-Einstein condensation of excitons with a built-in electric polarization. C1 FMF Univ Ljubljana, Dept Phys, Ljubljana, Slovenia. J Stefan Inst, Ljubljana, Slovenia. Los Alamos Natl Lab, Ctr Nonlinear Studies & Theoret Div, Los Alamos, NM 87545 USA. Chinese Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China. RP Bonca, J (reprint author), FMF Univ Ljubljana, Dept Phys, Ljubljana, Slovenia. EM janez.bonca@ijs.si NR 5 TC 1 Z9 1 U1 0 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD JAN 30 PY 2005 VL 19 IS 1-3 BP 525 EP 527 DI 10.1142/S0217979205028967 PN 2 PG 3 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 919RO UT WOS:000228635500037 ER PT J AU Bridges, F Downward, L AF Bridges, F Downward, L TI Universal relationship between magnetization and changes in the local structure in quasicubic and bilayer manganites SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT 5th International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials CY JUN 11-16, 2004 CL Chongqing, PEOPLES R CHINA DE EXAFS; manganites; CMR ID LA1-XCAXMNO3; DISTORTIONS; MAGNETISM AB We extend our previous EXAFS investigations on the relationship between magnetization and local distortions to the bilayer materials La2-2xSr1+2xMn2O7 and to higher magnetic fields, for quasicubic La0.7Ca0.3MnO3. For each, there is a significant change in the broadening parameter sigma of the Mn-O pair distribution function (PDF) associated with polaron formation as T is increased through T, Applying a magnetic field reduces the local distortion of the Ca sample for temperatures near T-c. For samples with sharp transitions, there is still a significant change of sigma(2) with T below T-c when the sample is fully magnetized, i.e. distortions are still present and continuing to be removed as T is lowered well below T-c. A simple model is presented for the magnetization process. C1 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. Montana State Univ, Dept Phys, Bozeman, MT 59717 USA. Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. RP Bridges, F (reprint author), Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. EM bridges@frosty.ucsc.edu NR 5 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD JAN 30 PY 2005 VL 19 IS 1-3 BP 529 EP 532 DI 10.1142/S0217979205028979 PN 2 PG 4 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 919RO UT WOS:000228635500038 ER PT J AU Gee, MJR Gawthorpe, RL Friedmann, JS AF Gee, MJR Gawthorpe, RL Friedmann, JS TI Giant striations at the base of a submarine landslide SO MARINE GEOLOGY LA English DT Article DE landslide; debris flows; earthquakes; runout; catastrophic; faulting ID SAHARAN DEBRIS FLOW; CONTINENTAL-SLOPE; SLIDE; STRATIGRAPHY; SEQUENCE AB A major submarine landslide with a volume >20 km(3) and an area >430 km(2) has been imaged in the subsurface off Angola, using 3D seismic data. The landslide basal surface preserves large 'striations' (similar to9-km long) which appear to record the catastrophic failure and show dramatic evidence for basal erosion over an area >130 km(2). These 'striations' terminate abruptly up-slope at a major growth fault. The landslide head terminates at this fault, and an earthquake or fluid flow associated with that fault may have triggered the failure event. Within the landslide deposit, giant tabular blocks similar to1- to 5-km across and similar to100- to 150-m thick and chaotic debris flow deposit indicate rapid emplacement. The landslide surface geometry reveals block disaggregation and a fully developed debris flow facies less than 5 kin from source. The landslide deposit extends to the SW beyond the study area, so volume and area are underestimated. Volume estimates of the landslide deposit exceed the failure scar volume by a factor of 2 or more, indicating significant seafloor remobilisation during emplacement. Results give new insights into the triggering mechanisms and basal erosion processes of submarine landslide failure. (C) 2004 Published by Elsevier B.V. C1 Univ Manchester, Dept Earth Sci, Basin & Stratig Studies Grp, Manchester M13 9PL, Lancs, England. Lawrence Livermore Natl Lab, Energy & Environm Directorate, Livermore, CA 94550 USA. RP Gee, MJR (reprint author), Univ Manchester, Dept Earth Sci, Basin & Stratig Studies Grp, Manchester M13 9PL, Lancs, England. EM martin.j.gee@man.ac.uk; friedmann2@llnl.gov RI Gawthorpe, Robert/L-7598-2016 OI Gawthorpe, Robert/0000-0002-4352-6366 NR 22 TC 51 Z9 55 U1 2 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-3227 J9 MAR GEOL JI Mar. Geol. PD JAN 30 PY 2005 VL 214 IS 1-3 BP 287 EP 294 DI 10.1016/j.margeo.2004.09.003 PG 8 WC Geosciences, Multidisciplinary; Oceanography SC Geology; Oceanography GA 890UN UT WOS:000226536500015 ER PT J AU Goldstein, RZ Alia-Klein, N Leskovjan, AC Fowler, JS Wang, GJ Gur, RC Hitzemann, R Volkow, ND AF Goldstein, RZ Alia-Klein, N Leskovjan, AC Fowler, JS Wang, GJ Gur, RC Hitzemann, R Volkow, ND TI Anger and depression in cocaine addiction: association with the orbitofrontal cortex SO PSYCHIATRY RESEARCH-NEUROIMAGING LA English DT Article DE PET (18)FDG; MMP1-2; anger; depression; drug abuse ID DRUG-ADDICTION; FRONTAL-CORTEX; CONTENT SCALE; PET; INVOLVEMENT; ALCOHOLICS; SADNESS AB The high prevalence of anger, impulsivity and violence in cocaine addiction implicates chronic cocaine use in the compromise of higher-order inhibitory control neurocognitive processes. We used the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) anger content scale as a personality measure of inhibitory control and examined its association with glucose metabolism in the lateral orbitofrontal gyrus (LOFG) at rest as measured by positron emission tomography with 2-deoxy-2[F-18]fluoro-D-glucose (PET (18)FDG) in 17 recently abstinent cocaine-dependent subjects and 16 comparison subjects. Three additional variables-the MMPI-2 depression content scale, metabolism in the medial orbitotrontal gyrus (MOFG) and the anterior cingulate (AC) gyrus-were inspected. When level of education was statistically controlled for, the LOFG was significantly associated with anger within the cocaine group. No other region was associated with anger within the cocaine-dependent group, and the LOFG did not correlate with depression within any of the study groups. The present study confirms earlier reports in demonstrating a positive association between relative metabolism at rest in the LOFG and cognitive-behavioral and personality measures of inhibitory control in drug addiction: the higher the metabolism, the better the inhibitory control. (c) 2004 Elsevier Ireland Ltd. All rights reserved. C1 Brookhaven Natl Lab, Med Res, Upton, NY 11973 USA. Univ Penn, Dept Psychiat, Brain Behav Lab, Philadelphia, PA 19104 USA. Oregon Hlth & Sci Univ, Dept Behav Neurosci, Portland, OR 97239 USA. RP Goldstein, RZ (reprint author), Brookhaven Natl Lab, Med Res, Bldg 490,30 Bell Ave, Upton, NY 11973 USA. EM rgoldstein@bnl.gov FU NIDA NIH HHS [R01 DA006891-03, K23 DA015517-01, 1K23 DA15517-01, DA06891-06] NR 33 TC 25 Z9 26 U1 1 U2 8 PU ELSEVIER IRELAND LTD PI CLARE PA ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000, IRELAND SN 0925-4927 J9 PSYCHIAT RES-NEUROIM JI Psychiatry Res. Neuroimaging PD JAN 30 PY 2005 VL 138 IS 1 BP 13 EP 22 DI 10.1016/j.pscychresns.2004.10.002 PG 10 WC Clinical Neurology; Neuroimaging; Psychiatry SC Neurosciences & Neurology; Psychiatry GA 905ZW UT WOS:000227611300002 PM 15708297 ER PT J AU Thompson, DN Ginosaur, DM Burch, KC AF Thompson, DN Ginosaur, DM Burch, KC TI Regeneration of a deactivated USY alkylation catalyst using supercritical isobutane SO APPLIED CATALYSIS A-GENERAL LA English DT Article DE alkylation; isoparaffin trimethylpentane; solid acid catalyst; supercritical fluid; regeneration ID SOLID ACID CATALYSTS; 1-BUTENE/ISOBUTANE ALKYLATION; CARBON-DIOXIDE; FLUIDS; HYDROCARBONS; CHEMISTRY; ZEOLITE; TRENDS AB Off-line, in situ alkylation activity recovery from a completely deactivated solid acid catalyst was examined in a continuous-flow reaction system employing supercritical isobutane. A USY zeolite catalyst was initially deactivated during the liquid phase alkylation of butene with isobutane in a single-pass reactor and then varying amounts of alkylation activity were recovered by passing supercritical isobutane over the catalyst bed at variable reactivation conditions. Temperature, pressure and regeneration time were found to play important roles in the supercritical isobutane regeneration process when applied to a completely deactivated USY zeolite alkylation catalyst. Manipulation of the variables that influence solute solubility, diffusivity, surface desorption, hydride transfer rates, and coke aging, strongly influences regeneration effectiveness. (C) 2004 Elsevier B.V. All fights reserved. C1 Idaho Natl Lab, Idaho Falls, ID 83415 USA. RP Ginosaur, DM (reprint author), Idaho Natl Lab, POB 1625, Idaho Falls, ID 83415 USA. EM thomdn@inel.gov; dmg@inel.gov; kam2@inel.gov RI Ginosar, Daniel/C-2357-2017 OI Ginosar, Daniel/0000-0002-8522-1659 NR 31 TC 20 Z9 22 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-860X J9 APPL CATAL A-GEN JI Appl. Catal. A-Gen. PD JAN 28 PY 2005 VL 279 IS 1-2 BP 109 EP 116 DI 10.1016/j.apcata.2004.10.018 PG 8 WC Chemistry, Physical; Environmental Sciences SC Chemistry; Environmental Sciences & Ecology GA 893ZJ UT WOS:000226759300011 ER PT J AU Sessler, JL An, DQ Cho, WS Lynch, V Marquez, M AF Sessler, JL An, DQ Cho, WS Lynch, V Marquez, M TI Calix[4]bipyrrole - a big, flexible, yet effective chloride-selective anion receptor SO CHEMICAL COMMUNICATIONS LA English DT Article ID HOST-GUEST CHEMISTRY; CALIX<6> PYRROLE; BINDING; CALIXPYRROLES; CAVITY AB Anion binding studies reveal that, in spite of its big size and flexible structure, calix[4]bipyrrole shows strong anion binding in general and good selectivity towards chloride anion in acetonitrile. C1 Univ Texas, Inst Cellular & Mol Biol, Dept Chem & Biochem, Austin, TX 78712 USA. Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. PMUSA, INEST Grp New Technol Res Dept, Richmond, VA 23298 USA. RP Sessler, JL (reprint author), Univ Texas, Inst Cellular & Mol Biol, Dept Chem & Biochem, 1 Univ Stn A5300, Austin, TX 78712 USA. EM sessler@mail.utexas.edu FU NIGMS NIH HHS [GM 58907] NR 14 TC 44 Z9 45 U1 0 U2 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1359-7345 J9 CHEM COMMUN JI Chem. Commun. PD JAN 28 PY 2005 IS 4 BP 540 EP 542 DI 10.1039/b412737d PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA 893NQ UT WOS:000226726900035 PM 15654396 ER PT J AU Wu, RY Skaar, EP Zhang, RG Joachimiak, G Gornicki, P Schneewind, O Joachimiak, A AF Wu, RY Skaar, EP Zhang, RG Joachimiak, G Gornicki, P Schneewind, O Joachimiak, A TI Staphylococcus aureus IsdG and IsdI, heme-degrading enzymes with structural similarity to monooxygenases SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID CORYNEBACTERIUM-DIPHTHERIAE; OXYGENASE; IRON; EXPRESSION; GENE; BIOSYNTHESIS; ACQUISITION; PROTEINS; PRODUCT AB Heme-degrading enzymes are involved in human diseases ranging from stroke, cancer, and multiple sclerosis to infectious diseases such as malaria, diphtheria, and meningitis. All mammalian and microbial enzymes identified to date are members of the heme oxygenase superfamily and assume similar monomeric structures with an all a-helical fold. Here we describe the crystal structures of IsdG and IsdI, two heme-degrading enzymes from Staphylococcus aureus. The structures of both enzymes resemble the ferredoxin-like fold and form a beta-barrel at the dimer interface. Two large pockets found on the outside of the barrel contain the putative active sites. Sequence homologs of IsdG and IsdI were identified in multiple Gram-positive pathogens. Substitution of conserved IsdG amino acid residues either reduced or abolished heme degradation, suggesting a common catalytic mechanism. This mechanism of IsdG-mediated heme degradation may be similar to that of the structurally related monooxygenases, enzymes involved in the synthesis of antibiotics in Streptomyces. Our results imply the evolutionary adaptation of microbial enzymes to unique environments. C1 Argonne Natl Lab, Struct Biol Ctr, Biosci Div, Argonne, IL 60439 USA. Argonne Natl Lab, Midwest Ctr Struct Genom, Biosci Div, Argonne, IL 60439 USA. Univ Chicago, Dept Microbiol, Chicago, IL 60637 USA. Univ Chicago, Dept Mol Genet & Cell Biol, Chicago, IL 60637 USA. Univ Chicago, Dept Biochem & Mol Biol, Chicago, IL 60637 USA. RP Schneewind, O (reprint author), Argonne Natl Lab, Struct Biol Ctr, Biosci Div, 9700 S Cass Ave,Bldg 202, Argonne, IL 60439 USA. EM oschnee@bsd.uchicago.edu; andrzejj@anl.gov FU NIAID NIH HHS [AI38897, AI52474, R01 AI038897, R01 AI052474]; NIGMS NIH HHS [GM62414, P50 GM062414, P50 GM062414-02] NR 23 TC 83 Z9 89 U1 3 U2 9 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD JAN 28 PY 2005 VL 280 IS 4 BP 2840 EP 2846 DI 10.1074/jbc.M409526200 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 889NG UT WOS:000226449100058 PM 15520015 ER PT J AU Gosling, JT Skoug, RM McComas, DJ Smith, CW AF Gosling, JT Skoug, RM McComas, DJ Smith, CW TI Direct evidence for magnetic reconnection in the solar wind near 1 AU SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ACCELERATED FLOW EVENTS; LATITUDE BOUNDARY-LAYER; CORONAL MASS EJECTIONS; SLOW-MODE SHOCKS; DAYSIDE MAGNETOPAUSE; EARTHS MAGNETOPAUSE; GEOMAGNETIC TAIL; PLASMA SHEET; FIELD; CUSP AB [1] We have obtained direct evidence for local magnetic reconnection in the solar wind using solar wind plasma and magnetic field data obtained by the Advanced Composition Explorer ( ACE). The prime evidence consists of accelerated ion flow observed within magnetic field reversal regions in the solar wind. Here we report such observations obtained in the interior of an interplanetary coronal mass ejection (ICME) or at the interface between two ICMEs on 23 November 1997 at a time when the magnetic field was stronger than usual. The observed plasma acceleration was consistent with the Walen relationship, which relates changes in flow velocity to density-weighted changes in the magnetic field vector. Pairs of proton beams having comparable densities and counterstreaming relative to one another along the magnetic field at a speed of similar to 1.4V(A), where V-A was the local Alfven speed, were observed near the center of the accelerated flow event. We infer from the observations that quasi-stationary reconnection occurred sunward of the spacecraft and that the accelerated flow occurred within a Petschek-type reconnection exhaust region bounded by Alfven waves and having a cross section width of similar to 4 x 10(5) km as it swept over ACE. The counterstreaming ion beams resulted from solar wind plasma entering the exhaust region from opposite directions along the reconnected magnetic field lines. We have identified a limited number ( five) of other accelerated flow events in the ACE data that are remarkably similar to the 23 November 1997 event. All such events identified occurred at thin current sheets associated with moderate to large changes in magnetic field orientation (98degrees - 162degrees) in plasmas characterized by low proton beta (0.01 - 0.15) and high Alfven speed (51 - 204 km/s). They also were all associated with ICMEs. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. SW Res Inst, Space Sci & Engn Div, San Antonio, TX 78228 USA. Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. Univ New Hampshire, Ctr Space Sci, Inst Earth Oceans & Space, Durham, NH 03824 USA. RP Gosling, JT (reprint author), Los Alamos Natl Lab, MS D466, Los Alamos, NM 87545 USA. EM jgosling@lanl.gov NR 45 TC 167 Z9 173 U1 2 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD JAN 28 PY 2005 VL 110 IS A1 AR A01107 DI 10.1029/2004JA010809 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 892YW UT WOS:000226686900008 ER PT J AU Khare, A Rasmussen, KO Samuelsen, MR Saxena, A AF Khare, A Rasmussen, KO Samuelsen, MR Saxena, A TI Exact solutions of the saturable discrete nonlinear Schrodinger equation SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID SOLITON PROPAGATION; ELLIPTIC FUNCTIONS; CYCLIC IDENTITIES AB Exact solutions to a nonlinear Schrodinger lattice with a saturable nonlinearity are reported. For finite lattices we find two different standing-wave-like solutions, and for an infinite lattice we find a localized soliton-like solution. The existence requirements and stability of these solutions are discussed, and we find that our solutions are linearly stable in most cases. We also show that the effective Peierls-Nabarro barrier potential is nonzero thereby indicating that this discrete model is quite likely nonintegrable. C1 Inst Phys, Bhubaneswar 751005, Orissa, India. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark. RP Khare, A (reprint author), Inst Phys, Bhubaneswar 751005, Orissa, India. RI Rasmussen, Kim/B-5464-2009 OI Rasmussen, Kim/0000-0002-4029-4723 NR 16 TC 66 Z9 66 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD JAN 28 PY 2005 VL 38 IS 4 BP 807 EP 814 DI 10.1088/0305-4470/38/4/002 PG 8 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA 897ZD UT WOS:000227044500004 ER PT J AU Yoshida, S Reinhold, CO Persson, E Burgdorfer, J Dunning, FB AF Yoshida, S Reinhold, CO Persson, E Burgdorfer, J Dunning, FB TI Steering Rydberg wave packets using a chirped train of half-cycle pulses SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article; Proceedings Paper CT International Workshop and Seminar on Rydberg Physics CY APR 19-MAY 14, 2004 CL Max Planck Inst Physik Komplexer Sys, Dresden, GERMANY HO Max Planck Inst Physik Komplexer Sys ID ATOM; IONIZATION; SYSTEMS AB We present protocols for steering a Rydberg wave packet towards a preferred region in phase space using a train of half-cycle pulses. Developing such protocols is aided by classical phase spade portraits. The classical phase space changes its structure as the frequency and the strength of a train of pulses are modulated. The quantum wave packet can be made to follow such a change. The movement of the wave packet can thus be controlled by a proper modulation of the perturbation. In addition, this technique can be used to create a focused wave packet or to transfer it from one island to another associated with a different quasi-periodic motion. C1 Vienna Univ Technol, Inst Theoret Phys, A-1040 Vienna, Austria. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA. Rice Univ, Rice Quantum Inst, Houston, TX 77005 USA. RP Yoshida, S (reprint author), Vienna Univ Technol, Inst Theoret Phys, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria. OI Reinhold, Carlos/0000-0003-0100-4962 NR 16 TC 16 Z9 16 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 EI 1361-6455 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD JAN 28 PY 2005 VL 38 IS 2 SI SI BP S209 EP S217 DI 10.1088/0953-4075/38/2/016 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 899OM UT WOS:000227154000017 ER PT J AU Zhao, W Lancaster, JC Dunning, FB Reinhold, CO Burgdorfer, J AF Zhao, W Lancaster, JC Dunning, FB Reinhold, CO Burgdorfer, J TI The periodically kicked atom: effect of the average de field SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article; Proceedings Paper CT International Workshop and Seminar on Rydberg Physics CY APR 19-MAY 14, 2004 CL Max Planck Inst Physik Komplexer Sys, Dresden, GERMANY HO Max Planck Inst Physik Komplexer Sys ID RYDBERG ATOM; IONIZATION; PULSES; STATES AB The influence of a superposed offset field on the response of very-high-n Rydberg atoms to a sequence of impulsive perturbations provided by a train of (N less than or equal to 40) short unidirectional electric field pulses is investigated. Each pulse, termed a half-cycle pulse (HCP), has a duration T-p much less than T-n, where T-n is the classical electron orbital period. The presence of the offset field leads to dramatic changes in the survival probability, this peaking when the net average field experienced by the atom is zero. The physical mechanisms responsible for this are discussed with the aid of classical trajectory Monte Carlo simulations. Good agreement between theory and experiment is observed. C1 Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA. Rice Univ, Rice Quantum Inst, Houston, TX 77005 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Vienna Tech Univ, Inst Theoret Phys, A-1040 Vienna, Austria. RP Zhao, W (reprint author), Rice Univ, Dept Phys & Astron, MS 61,6100 Main St, Houston, TX 77005 USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 17 TC 12 Z9 12 U1 0 U2 0 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 JAN 28 PY 2005 VL 38 IS 2 SI SI BP S191 EP S201 DI 10.1088/0953-4075/38/2/014 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 899OM UT WOS:000227154000015 ER PT J AU Aranson, IS Gurevich, A Welling, MS Wijngaarden, RJ Vlasko-Vlasov, VK Vinokur, VM Welp, U AF Aranson, IS Gurevich, A Welling, MS Wijngaarden, RJ Vlasko-Vlasov, VK Vinokur, VM Welp, U TI Dendritic flux avalanches and nonlocal electrodynamics in thin superconducting films SO PHYSICAL REVIEW LETTERS LA English DT Article ID T-C SUPERCONDUCTORS; VORTEX AVALANCHES; PATTERN-FORMATION; MAGNETIC-FIELD; MGB2 FILMS; INSTABILITY; PENETRATION; GROWTH; LATTICE AB We report a mechanism of nonisothermal dendritic flux penetration in superconducting films. Our numerical and analytical analysis of coupled nonlinear Maxwell and thermal diffusion equations shows that dendritic flux pattern formation results from spontaneous branching of propagating flux filaments due to nonlocal magnetic flux diffusion and positive feedback between flux motion and Joule heating. The branching is triggered by a thermomagnetic edge instability, which causes stratification of the critical state. The resulting distribution of thermomagnetic microavalanches is not universal, because it depends on a spatial distribution of defects. Our results are in good agreement with experiments on Nb films. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53706 USA. Free Univ Amsterdam, Div Phys & Astron, NL-1081 HV Amsterdam, Netherlands. RP Aranson, IS (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Gurevich, Alex/A-4327-2008; Aranson, Igor/I-4060-2013 OI Gurevich, Alex/0000-0003-0759-8941; NR 34 TC 74 Z9 74 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 JAN 28 PY 2005 VL 94 IS 3 AR 037002 DI 10.1103/PhysRevLett.94.037002 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700068 PM 15698308 ER PT J AU Ares, S Voulgarakis, NK Rasmussen, KO Bishop, AR AF Ares, S Voulgarakis, NK Rasmussen, KO Bishop, AR TI Bubble nucleation and cooperativity in DNA melting SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSITIONS; DENATURATION; TRANSCRIPTION; MODELS AB The onset of intermediate states (denaturation bubbles) and their role during the melting transition of DNA are studied using the Peyrard-Bishop-Dauxois model by Monte Carlo simulations with no adjustable parameters. Comparison is made with previously published experimental results finding excellent agreement. Melting curves, critical DNA segment length for stability of bubbles, and the possibility of a two-state transition are studied. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Carlos III Madrid, GISC, Madrid 28911, Spain. Univ Carlos III Madrid, Dept Matemat, Madrid 28911, Spain. Univ Crete, Dept Phys, Iraklion 71003, Crete, Greece. Fdn Res & Technol Hellas, Iraklion 71003, Crete, Greece. RP Ares, S (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Ares, Saul/B-4082-2008; Rasmussen, Kim/B-5464-2009; Voulgarakis, Nikolaos/A-8711-2010 OI Ares, Saul/0000-0001-6214-4083; Rasmussen, Kim/0000-0002-4029-4723; NR 20 TC 70 Z9 70 U1 1 U2 9 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 JAN 28 PY 2005 VL 94 IS 3 AR 035504 DI 10.1103/PhysRevLett.94.035504 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700042 PM 15698282 ER PT J AU Arsene, I Bearden, IG Beavis, D Besliu, C Budick, B Boggild, H Chasman, C Christensen, CH Christiansen, P Cibor, J Debbe, R Enger, E Gaardhoje, JJ Germinario, M Hagel, K Ito, H Jipa, A Jordre, JI Jundt, F Jorgensen, CE Karabowicz, R Kim, EJ Kozik, T Larsen, TM Lee, JH Lee, YK Lindal, S Lystad, R Lovhoiden, G Majka, Z Makeev, A Mikelsen, M Murray, M Natowitz, J Neumann, B Nielsen, BS Ouerdane, D Planeta, R Rami, F Ristea, C Ristea, O Rohrich, D Samset, BH Sandberg, D Sanders, SJ Sheetz, RA Staszel, P Tveter, TS Videbaek, F Wada, R Yin, Z Zgura, IS AF Arsene, I Bearden, IG Beavis, D Besliu, C Budick, B Boggild, H Chasman, C Christensen, CH Christiansen, P Cibor, J Debbe, R Enger, E Gaardhoje, JJ Germinario, M Hagel, K Ito, H Jipa, A Jordre, JI Jundt, F Jorgensen, CE Karabowicz, R Kim, EJ Kozik, T Larsen, TM Lee, JH Lee, YK Lindal, S Lystad, R Lovhoiden, G Majka, Z Makeev, A Mikelsen, M Murray, M Natowitz, J Neumann, B Nielsen, BS Ouerdane, D Planeta, R Rami, F Ristea, C Ristea, O Rohrich, D Samset, BH Sandberg, D Sanders, SJ Sheetz, RA Staszel, P Tveter, TS Videbaek, F Wada, R Yin, Z Zgura, IS CA BRAHMS Collaboration TI Centrality dependence of charged-particle pseudorapidity distributions from d plus Au collisions at root s(NN)=200 GeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIPHASE TRANSPORT MODEL; HIGH-DENSITY QCD; NUCLEAR COLLISIONS; MULTIPLICITY; DEUTERON; BRAHMS; PROTON AB Charged-particle pseudorapidity densities are presented for the d+Au reaction at roots(NN)=200 GeV with -4.2less than or equal toetaless than or equal to4.2. The results, from the BRAHMS experiment at BNL Relativistic Heavy-Ion Collider, are shown for minimum-bias events and 0%-30%, 30%-60%, and 60%-80% centrality classes. Models incorporating both soft physics and hard, perturbative QCD-based scattering physics agree well with the experimental results. The data do not support predictions based on strong-coupling, semiclassical QCD. In the deuteron-fragmentation region the central 200 GeV data show behavior similar to full-overlap d+Au results at roots(NN)=19.4 GeV. C1 Univ Bucharest, Bucharest, Romania. Brookhaven Natl Lab, Upton, NY 11973 USA. Inst Rech Subatom, Strasbourg, France. Univ Louis Pasteur Strasbourg 1, Strasbourg, France. Inst Nucl Phys, Krakow, Poland. Jagiellonian Univ, Krakow, Poland. Johns Hopkins Univ, Baltimore, MD 21218 USA. NYU, New York, NY 10003 USA. Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark. Texas A&M Univ, College Stn, TX 77843 USA. Univ Bergen, Dept Phys, Bergen, Norway. Univ Kansas, Lawrence, KS 66045 USA. Univ Oslo, Dept Phys, Oslo, Norway. RP Arsene, I (reprint author), Univ Bucharest, Bucharest, Romania. RI Christensen, Christian Holm/A-4901-2010; Christensen, Christian/D-6461-2012; Bearden, Ian/M-4504-2014; Samset, Bjorn H./B-9248-2012 OI Christensen, Christian Holm/0000-0002-1850-0121; Christensen, Christian/0000-0002-1850-0121; Bearden, Ian/0000-0003-2784-3094; Samset, Bjorn H./0000-0001-8013-1833 NR 26 TC 42 Z9 44 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 032301 DI 10.1103/PhysRevLett.94.032301 PG 5 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700015 PM 15698255 ER PT J AU Cao, D Heffner, RH Bridges, F Jeong, IK Bauer, ED Yuhasz, WM Maple, MB AF Cao, D Heffner, RH Bridges, F Jeong, IK Bauer, ED Yuhasz, WM Maple, MB TI Local distortion induced metal-to-insulator phase transition in PrRu4P12 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SKUTTERUDITE STRUCTURE; PRFE4P12 AB Extended x-ray absorption fine structure (EXAFS) experiments have been carried out on PrRu4P12 and PrOs4P12 to study the metal-to-insulator (MI) phase transition in PrRu4P12. No Pr displacement was observed across the MI transition temperature from the EXAFS data. Instead, our EXAFS data clearly show that a Ru displacement is associated with this MI transition. The very high Debye temperature for the Ru-P bond (Theta(D)=690 K) suggests that a slight rotation/displacement of relatively rigid RuP6 octahedra leads to this small Ru displacement, which accompanies the MI transition at 62 K in PrRu4P12. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. Univ Calif San Diego, Inst Pure & Appl Phys Sci, La Jolla, CA 92093 USA. RP Cao, D (reprint author), Los Alamos Natl Lab, MS-K764, Los Alamos, NM 87545 USA. RI Yuhasz, William/C-9418-2009; Bauer, Eric/D-7212-2011 NR 16 TC 17 Z9 17 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 JAN 28 PY 2005 VL 94 IS 3 AR 036403 DI 10.1103/PhysRevLett.94.036403 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700052 ER PT J AU Capaz, RB Spataru, CD Tangney, P Cohen, ML Louie, SG AF Capaz, RB Spataru, CD Tangney, P Cohen, ML Louie, SG TI Temperature dependence of the band gap of semiconducting carbon nanotubes SO PHYSICAL REVIEW LETTERS LA English DT Article ID RAMAN-SCATTERING; FLUORESCENCE; MICROTUBULES; GERMANIUM AB The temperature dependence of the band gap of semiconducting single-wall carbon nanotubes (SWNTs) is calculated by direct evaluation of electron-phonon couplings within a "frozen-phonon" scheme. An interesting diameter and chirality dependence of E(g)(T) is obtained, including nonmonotonic behavior for certain tubes and distinct "family" behavior. These results are traced to a strong and complex coupling between band-edge states and the lowest-energy optical phonon modes in SWNTs. The E(g)(T) curves are modeled by an analytic function with diameter- and chirality-dependent parameters; these provide a valuable guide for systematic estimates of E(g)(T) for any given SWNT. The magnitudes of the temperature shifts at 300 K are smaller than 12 meV and should not affect (n,m) assignments based on optical measurements. C1 Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Capaz, RB (reprint author), Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68528, BR-21941972 Rio De Janeiro, Brazil. RI Tangney, Paul/D-1623-2010; B, Rodrigo/N-7595-2014 NR 33 TC 88 Z9 88 U1 1 U2 18 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 JAN 28 PY 2005 VL 94 IS 3 AR 036801 DI 10.1103/PhysRevLett.94.036801 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700060 PM 15698300 ER PT J AU Choi, B Zocchi, G Canale, S Wu, Y Chan, S Perry, LJ AF Choi, B Zocchi, G Canale, S Wu, Y Chan, S Perry, LJ TI Artificial allosteric control of maltose binding protein SO PHYSICAL REVIEW LETTERS LA English DT Article ID LIGAND-BINDING; CRYSTAL-STRUCTURES; ACTIVE-TRANSPORT; YEAST HEXOKINASE; HYBRIDIZATION; CHEMOTAXIS; SITE AB We demonstrate the allosteric control of a protein based on mechanical tension. When substrate binding is accompanied by a significant change of conformation of the protein, a mechanical tension favoring one or the other conformation will alter the binding affinity for the substrate. We have constructed a chimera where the two lobes of the maltose-binding protein are covalently coupled to the ends of a DNA oligomer. The mechanical tension on the protein is controlled externally by exploiting the difference in stiffness between single stranded and double stranded DNA. We report that the binding affinity of the protein for its substrates is significantly altered by the tension. C1 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Dept Mol Cell & Dev Biol, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, UCLA DOE Inst Proteom & Genom, Los Angeles, CA 90095 USA. RP Choi, B (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. NR 19 TC 27 Z9 27 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 038103 DI 10.1103/PhysRevLett.94.038103 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700088 PM 15698328 ER PT J AU Cormier, E Walmsley, IA Kosik, EM Wyatt, AS Corner, L DiMauro, LF AF Cormier, E Walmsley, IA Kosik, EM Wyatt, AS Corner, L DiMauro, LF TI Self-referencing, spectrally, or spatially encoded spectral interferometry for the complete characterization of attosecond electromagnetic pulses SO PHYSICAL REVIEW LETTERS LA English DT Article ID ULTRASHORT OPTICAL PULSES; ELECTRIC-FIELD RECONSTRUCTION; ORDER HARMONIC RADIATION; X-RAY PULSES; PHASE INTERFEROMETRY; FEMTOSECOND; GENERATION; COHERENCE AB We propose a method for the complete characterization of attosecond duration electromagnetic pulses produced by high harmonic generation in an atomic gas. Our method is based on self-referencing spectral interferometry of two spectrally sheared extreme ultraviolet pulses, which is achieved by pumping the harmonic source with two sheared optical driving pulses. The resulting interferogram contains sufficient information to completely reconstruct the temporal behavior of the electric field. We demonstrate that such a method is feasible, and outline two possible experimental configurations. C1 Univ Bordeaux 1, CELIA, F-33405 Talence, France. Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England. Univ Rochester, Inst Opt, Rochester, NY 14627 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cormier, E (reprint author), Univ Bordeaux 1, CELIA, 351 Cours Liberat, F-33405 Talence, France. OI Wyatt, Adam/0000-0001-8625-6709; Corner, Laura/0000-0002-3882-1272 NR 26 TC 35 Z9 35 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 033905 DI 10.1103/PhysRevLett.94.033905 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700030 PM 15698270 ER PT J AU Dawson, S Jackson, CB Reina, L Wackeroth, D AF Dawson, S Jackson, CB Reina, L Wackeroth, D TI Higgs-boson production with one bottom-quark jet at hadron colliders SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-QUARK; COLLISIONS AB We present total rates and kinematic distributions for the associated production of a single bottom quark and a Higgs boson at the Fermilab Tevatron and CERN Large Hardon Collider. We include next-to-leading order QCD corrections and compare the results obtained in the four and five flavor number schemes for parton distribution functions. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA. RP Dawson, S (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. OI Dawson, Sally/0000-0002-5598-695X NR 25 TC 50 Z9 50 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 031802 DI 10.1103/PhysRevLett.94.031802 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700010 PM 15698250 ER PT J AU Filevich, J Rocca, JJ Marconi, MC Moon, SJ Nilsen, J Scofield, JH Dunn, J Smith, RF Keenan, R Hunter, JR Shlyaptsev, VN AF Filevich, J Rocca, JJ Marconi, MC Moon, SJ Nilsen, J Scofield, JH Dunn, J Smith, RF Keenan, R Hunter, JR Shlyaptsev, VN TI Observation of a multiply ionized plasma with index of refraction greater than one SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY LASER; TABLETOP LASER; INTERFEROMETRY; DIAGNOSTICS; PHOTOABSORPTION; MIRROR; NM AB We present clear experimental evidence showing that the contribution of bound electrons can dominate the index of refraction of laser-created plasmas at soft x-ray wavelengths. We report anomalous fringe shifts in soft x-ray laser interferograms of Al laser-created plasmas. The comparison of measured and simulated interferograms shows that this results from the dominant contribution of low charge ions to the index of refraction. This usually neglected bound electron contribution can affect the propagation of soft x-ray radiation in plasmas and the interferometric diagnostics of plasmas for many elements. C1 Colorado State Univ, NSF ERC Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Davis Livermore, Dept Appl Sci, Livermore, CA 94451 USA. Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA. RP Filevich, J (reprint author), Colorado State Univ, NSF ERC Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. NR 19 TC 42 Z9 42 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 035005 DI 10.1103/PhysRevLett.94.035005 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700038 PM 15698278 ER PT J AU Guo, JD Shi, JR Plummer, EW AF Guo, JD Shi, JR Plummer, EW TI Low temperature disordered phase of alpha-Pb/Ge(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHARGE-DENSITY-WAVE; TRANSITION-METAL OXIDES; LONG-RANGE INTERACTIONS; SN/GE(111); SURFACES; DISTORTION AB A new structural phase transition has been observed at low temperature for the one-third of a monolayer (alpha phase) of Pb on Ge(111) using a variable-temperature scanning tunneling microscope. The well-known (root3 x root3)R30 degrees to (3x3) transition is accompanied by a new structural phase transition from (3x3) to a disordered phase at similar to76 K. The formation of this "glasslike" phase is a consequence of competing interactions on different length scales. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. RP Guo, JD (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RI Shi, Junren/D-5156-2009; Guo, Jiandong/F-2081-2015 OI Guo, Jiandong/0000-0002-7893-022X NR 20 TC 16 Z9 17 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 036105 DI 10.1103/PhysRevLett.94.036105 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700048 PM 15698288 ER PT J AU Lopatin, AV Shah, N Vinokur, VM AF Lopatin, AV Shah, N Vinokur, VM TI Fluctuation conductivity of thin films and nanowires near a parallel-field-tuned superconducting quantum phase transition SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRONG MAGNETIC-FIELD; INSULATOR TRANSITION; ORDER PARAMETER; MAGNETORESISTANCE; DIMENSIONS; SYSTEMS; ALLOYS; METALS AB We calculate the fluctuation correction to the normal state conductivity in the vicinity of a quantum phase transition from a superconducting to a normal state, induced by applying a magnetic field parallel to a dirty thin film or a nanowire with thickness smaller than the superconducting coherence length. We find that at zero temperature, where the correction comes purely from quantum fluctuations, the positive "Aslamazov-Larkin" contribution, the negative "density of states" contribution, and the "Maki-Thompson" interference contribution are all of the same order and the total correction is negative. Further, we show that, based on how the quantum critical point is approached, there are three regimes that show different temperature and field dependencies which should be experimentally accessible. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. ETH Honggerberg, CH-8093 Zurich, Switzerland. RP Lopatin, AV (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 26 TC 27 Z9 27 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 037003 DI 10.1103/PhysRevLett.94.037003 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700069 PM 15698309 ER PT J AU Lu, M Adams, GS Adams, T Bar-Yam, Z Bishop, JM Bodyagin, VA Brown, DS Cason, NM Chung, SU Cummings, JP Danyo, K Demianov, AI Denisov, SP Dorofeev, V Dowd, JP Eugenio, P Fan, XL Gribushin, AM Hackenburg, RW Hayek, M Hu, J Ivanov, EI Joffe, D Kachaev, I Kern, W King, E Kodolova, OL Korotkikh, VL Kostin, MA Kuhn, J Lipaev, VV LoSecco, JM Manak, JJ Nozar, M Olchanski, C Ostrovidov, AI Pedlar, TK Popov, AV Ryabchikov, DI Sarycheva, LI Seth, KK Shenhav, N Shen, X Shephard, WD Sinev, NB Stienike, DL Suh, JS Taegar, SA Tomaradze, A Vardanyan, IN Weygand, DP White, DB Willutzki, HJ Witkowski, M Yershov, AA AF Lu, M Adams, GS Adams, T Bar-Yam, Z Bishop, JM Bodyagin, VA Brown, DS Cason, NM Chung, SU Cummings, JP Danyo, K Demianov, AI Denisov, SP Dorofeev, V Dowd, JP Eugenio, P Fan, XL Gribushin, AM Hackenburg, RW Hayek, M Hu, J Ivanov, EI Joffe, D Kachaev, I Kern, W King, E Kodolova, OL Korotkikh, VL Kostin, MA Kuhn, J Lipaev, VV LoSecco, JM Manak, JJ Nozar, M Olchanski, C Ostrovidov, AI Pedlar, TK Popov, AV Ryabchikov, DI Sarycheva, LI Seth, KK Shenhav, N Shen, X Shephard, WD Sinev, NB Stienike, DL Suh, JS Taegar, SA Tomaradze, A Vardanyan, IN Weygand, DP White, DB Willutzki, HJ Witkowski, M Yershov, AA CA E852 Collaboration TI Exotic meson decay to omega pi(0)pi(-) SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUX-TUBE MODEL; 18 GEV/C; HYBRID; PI; SYSTEM; WAVE; QCD AB A partial-wave analysis of the mesons from the reaction pi(-)p-->pi(+)pi(-)pi(-)pi(0)pi(0)p has been performed. The data show b(1)pi decay of the spin-exotic states pi(1)(1600) and pi(1)(2000). Three isovector 2(-+) states were seen in the omegarho(-) decay channel. In addition to the well known pi(2)(1670), signals were also observed for pi(2)(1880) and pi(2)(1970). C1 Rensselaer Polytech Inst, Dept Phys, Troy, NY 12180 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Univ Massachusetts Dartmouth, Dept Phys, N Dartmouth, MA 02747 USA. Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119899, Russia. Northwestern Univ, Dept Phys, Evanston, IL 60208 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Inst High Energy Phys, Protvino 142284, Russia. Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Idaho State Univ, Dept Phys, Pocatello, ID 83209 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RAFAEL, Haifa, Israel. Inst High Energy Phys, Beijing 100039, Peoples R China. RP Lu, M (reprint author), Univ Oregon, Dept Phys, Eugene, OR 97403 USA. RI Demianov, Andrei/E-4565-2012; Vardanyan, Irina/K-7981-2012; Gribushin, Andrei/J-4225-2012 NR 33 TC 63 Z9 64 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 032002 DI 10.1103/PhysRevLett.94.032002 PG 5 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700012 PM 15698252 ER PT J AU Masuda, T Zheludev, A Bush, A Markina, M Vasiliev, A AF Masuda, T Zheludev, A Bush, A Markina, M Vasiliev, A TI Comment on "Competition between helimagnetism and commensurate quantum spin correlations in LiCu2O2" - Reply SO PHYSICAL REVIEW LETTERS LA English DT Editorial Material C1 Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. Moscow Inst Radiotech Elect & Automat, Moscow 117464, Russia. Moscow MV Lomonosov State Univ, Low Temp Phys Dept, Moscow, Russia. RP Masuda, T (reprint author), Oak Ridge Natl Lab, Condensed Matter Sci Div, POB 2008, Oak Ridge, TN 37831 USA. RI Markina, Maria/B-8487-2009; Vasiliev, Alexander/A-7562-2008 OI Markina, Maria/0000-0001-8177-3387; NR 5 TC 28 Z9 28 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 039706 DI 10.1103/PhysRevLett.94.039706 PG 1 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700099 ER PT J AU Mitsui, T Rose, MK Fomin, E Ogletree, DF Salmeron, M AF Mitsui, T Rose, MK Fomin, E Ogletree, DF Salmeron, M TI Diffusion and pair interactions of CO molecules on Pd(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPE; SURFACE-DIFFUSION; PT(111); SPECTROSCOPY; ADSORPTION; HYDROGEN; ADATOMS; OXYGEN AB The diffusion and interactions of CO molecules on Pd(111) were studied by scanning tunneling microscopy. By following the random walk motion of individual molecules as a function of temperature, an activation energy barrier for diffusion of 118+/-5 meV was determined. The interaction between CO molecules was found to be repulsive for pairs separated by one or two Pd(111) lattice distances, and weakly attractive at a separation of root3. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Mitsui, T (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Ogletree, D Frank/D-9833-2016 OI Ogletree, D Frank/0000-0002-8159-0182 NR 20 TC 30 Z9 30 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 28 PY 2005 VL 94 IS 3 AR 036101 DI 10.1103/PhysRevLett.94.036101 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700044 PM 15698284 ER PT J AU Sarkisov, GS Rosenthal, SE Struve, KW McDaniel, DH AF Sarkisov, GS Rosenthal, SE Struve, KW McDaniel, DH TI Corona-free electrical explosion of polyimide-coated tungsten wire in vacuum SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present experimental evidence of corona-free electrical explosion of dielectric-coated W wire in vacuum. A fast current rise of similar to150 A/ns and a coating of 2 mum polyimide are both needed to achieve the corona-free regime of explosion. Breakdown is absent in corona-free explosion; the wire remains resistive, and this allows anomalously high energy deposition (similar to20 times atomization enthalpy). MHD simulations reproduce the main differences between corona and corona-free explosions. A corona-free explosion of a wire can be useful for the generation of a hot plasma column by direct energy deposition. C1 Ktech Corp Inc, Albuquerque, NM 87123 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sarkisov, GS (reprint author), Ktech Corp Inc, 1300 Eubank Blvd, Albuquerque, NM 87123 USA. NR 11 TC 28 Z9 30 U1 2 U2 15 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 JAN 28 PY 2005 VL 94 IS 3 AR 035004 DI 10.1103/PhysRevLett.94.035004 PG 4 WC Physics, Multidisciplinary SC Physics GA 891TU UT WOS:000226604700037 PM 15698277 ER EF