FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Reynolds, JG Nelson, AJ Wong, J Roos, J AF Reynolds, JG Nelson, AJ Wong, J Roos, J TI Applications of X-ray methods to speciate manganese particulates from vehicles using MMT fuel. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Ethyl Corp, Richmond, VA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 83-FUEL BP U683 EP U683 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103715 ER PT J AU Rider, KB Hwang, KS Salmeron, M Somorjai, G AF Rider, KB Hwang, KS Salmeron, M Somorjai, G TI High-pressure NO-CO coadsorption on RH(111) studied by STM. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 147-COLL BP U524 EP U524 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102841 ER PT J AU Ritter, J Jarvinen, G AF Ritter, J Jarvinen, G TI Join the separation science and technology subdivision of the ACS division of I&EC. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ S Carolina, Dept Chem Engn, Columbia, SC 29208 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 49-IEC BP U730 EP U730 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103898 ER PT J AU Robblee, JH Messinger, J Bergmann, U Fernandez, C Glatzel, P Visser, H Cinco, RM McFarlane, KL Bellacchio, E Pizarro, SA Cramer, SP Sauer, K Yachandra, VK Klein, MP AF Robblee, JH Messinger, J Bergmann, U Fernandez, C Glatzel, P Visser, H Cinco, RM McFarlane, KL Bellacchio, E Pizarro, SA Cramer, SP Sauer, K Yachandra, VK Klein, MP TI Absence of Mn-centered oxidation in the S-2 circle divide S-3 transition: Implications for the mechanism of photosynthetic water oxidation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, MC, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Melvin Calvin Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 63-INOR BP U780 EP U780 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104200 ER PT J AU Robinson, JC Sun, W Neumark, DM AF Robinson, JC Sun, W Neumark, DM TI Photodissociation dynamics of 2-butyne at 193 nm. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Div Chem Sci,Neumark Grp, Berkeley, CA 94720 USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 396-PHYS BP U337 EP U337 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201855 ER PT J AU Romanovski, VV Brachmann, A Palmer, CE Shaw, HF Bourcier, WL Jardine, LJ AF Romanovski, VV Brachmann, A Palmer, CE Shaw, HF Bourcier, WL Jardine, LJ TI Plutonium colloidal and aqueous speciation in groundwater surrogate. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Glenn T Seaborg Inst Transactinium Sci, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Yucca Mt Program, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Nonproliferat Arms Control & Int Secur Directorat, Livermore, CA 94550 USA. RI Shaw, Henry/B-6445-2012 OI Shaw, Henry/0000-0003-0681-5430 NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 90-NUCL BP U80 EP U80 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200429 ER PT J AU Rotenberg, E AF Rotenberg, E TI Momentum-resolved electronic states in I-alpdmn quasicrystals. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94610 USA. RI Rotenberg, Eli/B-3700-2009 OI Rotenberg, Eli/0000-0002-3979-8844 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 4-PHYS BP U268 EP U268 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201463 ER PT J AU Rowley, JK AF Rowley, JK TI Chemical aspects of some solar neutrino experiments. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 2-NUCL BP U67 EP U67 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200341 ER PT J AU Sachleben, RA Bryan, JC Franconville, B AF Sachleben, RA Bryan, JC Franconville, B TI Conformational and structural studies of calix[4]arene crown ethers and their complexes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Chem Separat Grp, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 124-IEC BP U742 EP U742 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103971 ER PT J AU Sackett, JI AF Sackett, JI TI Future of nuclear energy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Western Branch, Idaho Falls, ID 83403 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 50-FUEL BP U678 EP U678 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103682 ER PT J AU Saez, JC McMillan, JD Tholodur, A Hamilton, J Schell, DJ AF Saez, JC McMillan, JD Tholodur, A Hamilton, J Schell, DJ TI Carbon balance evaluation of cellulase enzyme production using insoluble cellulosic substrate. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Puerto Rico, Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 258-BIOT BP U211 EP U211 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100985 ER PT J AU Samara, GA AF Samara, GA TI Journey at the frontiers of materials science. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Nanostruct & Adv Mat Chem Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 147-PHYS BP U289 EP U289 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201606 ER PT J AU Sandi, G Khalili, NR Littrell, K Thiyagarajan, P AF Sandi, G Khalili, NR Littrell, K Thiyagarajan, P TI Analysis of the pore structure of activated carbons and catalysts produced from paper mill sludge using small-angle neutron scattering data. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. IIT, Dept Chem & Environm Engn, Chicago, IL 60616 USA. Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RI Littrell, Kenneth/D-2106-2013 OI Littrell, Kenneth/0000-0003-2308-8618 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 84-FUEL BP U683 EP U683 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103716 ER PT J AU Sandi, G Carrado, KA Winans, RE Seifert, S Johnson, CS AF Sandi, G Carrado, KA Winans, RE Seifert, S Johnson, CS TI Small-angle X-ray scattering studies of carbon anodes used in lithium-rechargeable batteries. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. RI Littrell, Kenneth/D-2106-2013 OI Littrell, Kenneth/0000-0003-2308-8618 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 81-FUEL BP U683 EP U683 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103713 ER PT J AU Sasaki, DY Last, JA Waggoner, TA AF Sasaki, DY Last, JA Waggoner, TA TI AFM imaging of molecular reorganization in lipid bilayers induced through ion recognition. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Biomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 83-PHYS BP U280 EP U280 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201542 ER PT J AU Sasaki, DY Waggoner, TA AF Sasaki, DY Waggoner, TA TI Surface compatible sol-gel materials for immobilized lipid bilayers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Biomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 292-COLL BP U556 EP U556 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102985 ER PT J AU Sasaki, DY Cox, JD Last, JA Terry, JL Gourley, PL AF Sasaki, DY Cox, JD Last, JA Terry, JL Gourley, PL TI Surface passivation of semiconductor surfaces to protein and cell adhesion using hydrophobic and hydrophilic monolayers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Biomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 260-COLL BP U551 EP U551 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102953 ER PT J AU Sasaki, JC Tran, NL Felton, JS Colvin, ME AF Sasaki, JC Tran, NL Felton, JS Colvin, ME TI Resonance-stabilization effects on the formation of electrophilic intermediates of aromatic amine mutagens. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 75-TOXI BP U484 EP U485 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102618 ER PT J AU Savard, G AF Savard, G TI Concept for the next generation RIB facility in the US SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 8-NUCL BP U68 EP U68 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200347 ER PT J AU Schenter, GK Kathmann, SM Garrett, BC AF Schenter, GK Kathmann, SM Garrett, BC TI Statistical mechanics of water clusters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RI Schenter, Gregory/I-7655-2014 OI Schenter, Gregory/0000-0001-5444-5484 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 306-PHYS BP U324 EP U324 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201765 ER PT J AU Schmidt, JAR Arnold, J AF Schmidt, JAR Arnold, J TI Reactivity of a series of sterically hindered amidinate ligands incorporating bulky terphenyl substituents. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 689-INOR BP U876 EP U876 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104822 ER PT J AU Schroeder, NC Bernard, JG Ashley, KR Blanchard, DL AF Schroeder, NC Bernard, JG Ashley, KR Blanchard, DL TI Fundamental chemistry, characterization, and separation of technetium complexes in Hanford waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Texas A&M Univ, Dept Chem, Commerce, TX USA. Pacific NW Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 53-IEC BP U731 EP U731 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103902 ER PT J AU Schulze, RK Farr, JD Neu, MP Morales, LA AF Schulze, RK Farr, JD Neu, MP Morales, LA TI Water interactions at plutonium oxide: Surface chemistry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 112-NUCL BP U83 EP U83 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200451 ER PT J AU Schwartz, SE AF Schwartz, SE TI Kinetics of cloud droplet activation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Environm Chem Div, Upton, NY 11973 USA. RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 223-PHYS BP U311 EP U311 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201682 ER PT J AU Schwegler, E Galli, G Gygi, F AF Schwegler, E Galli, G Gygi, F TI Water under pressure. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI Schwegler, Eric/F-7294-2010; Schwegler, Eric/A-2436-2016 OI Schwegler, Eric/0000-0003-3635-7418 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 67-COMP BP U598 EP U598 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103233 ER PT J AU Schweitzer-Stenner, R Lemke, C Dreybrodt, W Shelnutt, JA Martin, J Quirke, E AF Schweitzer-Stenner, R Lemke, C Dreybrodt, W Shelnutt, JA Martin, J Quirke, E TI Polarized Raman Dispersion Spectroscopy probes distortions due to electron withdrawing in NO2-meso-substituted Ni(II)-octaethylporphyrins. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Puerto Rico, Dept Chem, San Juan, PR 00931 USA. Univ Bremen, Inst Expt Phys, D-28359 Bremen, Germany. Sandia Natl Labs, Nanomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. Florida Int Univ, Dept Chem, Miami, FL 33199 USA. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 74-INOR BP U782 EP U782 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104210 ER PT J AU Shafir, A Whitener, GD Power, MP Arnold, J AF Shafir, A Whitener, GD Power, MP Arnold, J TI Homo- and heteropolymetallic systems based on 1,1'-diaminoferrocene and 1,1'-diazidoferrocene: Synthetic strategies, structures, and electrochemical properties. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Div Chem Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 703-INOR BP U878 EP U878 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104836 ER PT J AU Shaltout, R Loy, D McClain, M Prabakar, S Greaves, J Shea, KJ AF Shaltout, R Loy, D McClain, M Prabakar, S Greaves, J Shea, KJ TI Structural modification of sol-gel materials through retro Diels-Alder reaction. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ New Mexico, Albuquerque, NM 87131 USA. Univ Calif Irvine, Irvine, CA 92717 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 12-POLY BP U357 EP U357 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201964 ER PT J AU Shamsi, A Lyons, DK AF Shamsi, A Lyons, DK TI Methane dry reforming over carbide, nickel-based, and noble metal catalysts. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Fed Energy Technol Ctr, Morgantown, WV 26507 USA. NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 49-PETR BP U250 EP U250 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201383 ER PT J AU Shan, G Huang, W Gee, SJ Hammock, BD Buchholz, BA Vogel, JS AF Shan, G Huang, W Gee, SJ Hammock, BD Buchholz, BA Vogel, JS TI Application of accelerator mass spectrometry (AMS) to immunoassay. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Davis, Dept Entomol, Davis, CA 95616 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 219-ANYL BP U118 EP U118 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100535 ER PT J AU Sharma, A Hoppe, E Mong, G Warner, T AF Sharma, A Hoppe, E Mong, G Warner, T TI In situ chemical oxidation method for soil and groundwater remediation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Lab, Richland, WA 99352 USA. Terra Vac Corp, Seattle, WA 98133 USA. NR 0 TC 1 Z9 1 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 217-IEC BP U755 EP U756 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104061 ER PT J AU Shea, KJ Loy, DA AF Shea, KJ Loy, DA TI Bridged polysilsesquioxanes: A molecular-based approach for the synthesis of functional hybrid materials. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 10-POLY BP U357 EP U357 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201962 ER PT J AU Shelnutt, JA Lu, Y Qiu, Y AF Shelnutt, JA Lu, Y Qiu, Y TI Molecular simulations of porphyrins and heme proteins. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Nanomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. Univ New Mexico, Dept Chem, Albuquerque, NM 87131 USA. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 42-IEC BP U730 EP U730 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103896 ER PT J AU Shen, J Schmetz, E Kawaikin, GJ Winslow, JC Noceti, RP Nowak, MA Kratsman, D Tomer, BJ AF Shen, J Schmetz, E Kawaikin, GJ Winslow, JC Noceti, RP Nowak, MA Kratsman, D Tomer, BJ TI Ultraclean transportation fuels for the 21st century: The Fischer-Tropsch option - An option. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Germantown, MD 20874 USA. US DOE, Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. US DOE, FETC, Morgantown, WV 26506 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 74-PETR BP U254 EP U254 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201408 ER PT J AU Shuh, DK Booth, CH Bucher, JJ Caulder, DL Darab, JG Davis, LL Edelstein, NM Li, H Li, LY Liu, P Lukens, WW Rao, LF Strachan, DM AF Shuh, DK Booth, CH Bucher, JJ Caulder, DL Darab, JG Davis, LL Edelstein, NM Li, H Li, LY Liu, P Lukens, WW Rao, LF Strachan, DM TI Speciation of actinides and neutron absorbers in aluminoborosilicate glass by XAFS spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Gleen T Seaborg Ctr, Berkeley, CA 94720 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RI Booth, Corwin/A-7877-2008 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 47-NUCL BP U73 EP U73 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200386 ER PT J AU Sikes, HD Chidsey, CED Dudek, SP Smalley, JF Newton, MD Feldberg, SW AF Sikes, HD Chidsey, CED Dudek, SP Smalley, JF Newton, MD Feldberg, SW TI Negligible distance dependence of electron-transfer rate between gold electrodes and molecular acceptors through oligo(phenylenevinylene) spacers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Stanford Univ, Stanford, CA 94305 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 49-COLL BP U509 EP U509 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102745 ER PT J AU Simonelli, D Baldelli, S Shultz, MJ AF Simonelli, D Baldelli, S Shultz, MJ TI Sum frequency generation studies of molecular ammonia on the surface of aqueous solutions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Chem, Medford, MA 02155 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 356-PHYS BP U331 EP U331 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201815 ER PT J AU Simonelli, D Baldelli, S Shultz, MIJ AF Simonelli, D Baldelli, S Shultz, MIJ TI Sum-frequency generation studies of molecular ammonia on the surface of aqueous solutions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Chem, Medford, MA 02155 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 254-COLL BP U550 EP U550 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102947 ER PT J AU Simonelli, D Baldelli, S Gin, C Shultz, MJ AF Simonelli, D Baldelli, S Gin, C Shultz, MJ TI Adsorption of NH3 on TIO2 thin films observed with sum-frequency generation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Chem, Medford, MA 02155 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 92-COLL BP U516 EP U516 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102788 ER PT J AU Smith, BA Zhang, JZ Joly, A Liu, J AF Smith, BA Zhang, JZ Joly, A Liu, J TI Time-dependent luminescence decay kinetics of Mn(II) doped ZnS nanoclusters grown in inverse micelles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Santa Cruz, Dept Chem, Santa Cruz, CA 95060 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 429-PHYS BP U342 EP U342 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201888 ER PT J AU Smith, BF Robison, TW Jarvinen, GD Schroeder, NC Purdy, GM AF Smith, BF Robison, TW Jarvinen, GD Schroeder, NC Purdy, GM TI Polymer filtration for selective metal-ion recovery. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 227-IEC BP U757 EP U757 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104071 ER PT J AU Smith, CA Martinez, MR McFarlan, J Morris, JS Padilla, DD Veirs, DK Worl, LA AF Smith, CA Martinez, MR McFarlan, J Morris, JS Padilla, DD Veirs, DK Worl, LA TI Design of instrumented containers for long-term gas surveillance in the 94-1 program. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 79-NUCL BP U78 EP U78 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200418 ER PT J AU Smith, PH Melamed, D Millman, WS AF Smith, PH Melamed, D Millman, WS TI Future of catalysis in the Office of Basic Energy Sciences, US Department of Energy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US Dept Energy, Div Chem Sci Basic Energy Sci, Germantown, MD 20874 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 5-CATL BP U528 EP U528 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202952 ER PT J AU Snow, LA Smith, DD Sibille, L Cronise, RJ Hunt, AJ Ng, JD AF Snow, LA Smith, DD Sibille, L Cronise, RJ Hunt, AJ Ng, JD TI Determination of the effect of microgravity on silica sol-gels by electrophoretic porosimetry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Alabama, Dept Chem, Huntsville, AL 35899 USA. NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA. NASA, George C Marshall Space Flight Ctr, Univ Space Res Assoc, Huntsville, AL 35812 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Alabama, Dept Biol Sci, Huntsville, AL 35899 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 594-POLY BP U455 EP U455 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202542 ER PT J AU Somma, MS Medforth, CJ Muzzi, CM Smith, KM Shelnutt, JA AF Somma, MS Medforth, CJ Muzzi, CM Smith, KM Shelnutt, JA TI First H-1 NMR detection of the monocation of a simple porphyrin. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Davis, Dept Chem, Kevins Smiths Grp, Davis, CA 95616 USA. Sandia Natl Labs, Nanomol Mat & Interfaces Dept, Albuquerque, NM 87185 USA. RI Shelnutt, John/A-9987-2009; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Smith, Kevin/0000-0002-6736-4779 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 303-ORGN BP U141 EP U141 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200784 ER PT J AU Song, ZG AF Song, ZG TI Mechanism of organic sulfur evolution: A key to the understanding of sulfur role in the generation of hydrocarbons. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 33-GEOC BP U693 EP U693 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103751 ER PT J AU Sorenson, JM AF Sorenson, JM TI Redesigning the hydrophobic core of a model beta-sheet protein: Destabilizing traps through a threading approach. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci & Life Sci Div, Livermore, CA 94550 USA. EM JMSorenson@lbl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 275-PHYS BP U319 EP U319 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201734 ER PT J AU Spence, RD Kauschinger, JL Lewis, BE AF Spence, RD Kauschinger, JL Lewis, BE TI In situ grouting of soil and shallow land-buried waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 288-IEC BP U767 EP U767 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104132 ER PT J AU Spence, RD AF Spence, RD TI Low-temperature ashing of plastic media-blasting waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 289-IEC BP U767 EP U767 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104133 ER PT J AU Stakebake, JL McClard, J Szempruch, RW AF Stakebake, JL McClard, J Szempruch, RW TI Stabilization and packaging of plutonium oxide for 50-year storage. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Aiken, SC 29808 USA. US Dept Energy, Golden, CO 80403 USA. B&W Hanford Co, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 28-NUCL BP U70 EP U70 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200367 ER PT J AU Steinberg, M AF Steinberg, M TI CO2 mitigation and fuel production. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 13-PETR BP U245 EP U245 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201350 ER PT J AU Stewart, FF Luther, TA Harrup, MK Lash, RP AF Stewart, FF Luther, TA Harrup, MK Lash, RP TI Novel synthesis of polyesters containing hexa-(tert-butylhydroquinone)cyclotriphosphazene. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 303-POLY BP U401 EP U401 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202253 ER PT J AU Stiegel, GJ Maxwell, RC AF Stiegel, GJ Maxwell, RC TI Gasification technologies: The path to clean, affordable energy in the 21st century. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US Dept Energy, Fed Energy Technol Ctr, Pittsburgh, PA 15236 USA. Parsons Infrastruct & Technol Grp, Pittsburgh, PA 15236 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 29-FUEL BP U675 EP U675 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103661 ER PT J AU Stringfellow, WT Hines, RD Kilkenny, ST AF Stringfellow, WT Hines, RD Kilkenny, ST TI Applying cometabolic biological reactions for the ex situ treatment of MTBE contaminated groundwater. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. US Filter Envirex, Waukesha, WI USA. Kinder Morgan Energy Partners, Orange, CA USA. RI Stringfellow, William/O-4389-2015 OI Stringfellow, William/0000-0003-3189-5604 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 231-ENVR BP U655 EP U655 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103564 ER PT J AU Suib, SL Brock, SL Nair, J Thiyagarajan, P Littrell, K Tong, W AF Suib, SL Brock, SL Nair, J Thiyagarajan, P Littrell, K Tong, W TI Applications of X-ray and neutron methods to porous manganese oxide systems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Connecticut, Dept Chem, Storrs, CT 06269 USA. Wayne State Univ, Dept Chem, Detroit, MI 48202 USA. Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA. RI Littrell, Kenneth/D-2106-2013 OI Littrell, Kenneth/0000-0003-2308-8618 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 68-FUEL BP U681 EP U681 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103700 ER PT J AU Swanson, PE Kan, L Ito, L Richard, R Tiderington, A Vosejpka, L Xu, L Zhao, HM Hickman, D Grey, K Richardson, T Newman, J Unkefer, G AF Swanson, PE Kan, L Ito, L Richard, R Tiderington, A Vosejpka, L Xu, L Zhao, HM Hickman, D Grey, K Richardson, T Newman, J Unkefer, G TI Developing a biocatalytic process based on haloalkane dehalogenase for the manufacture of epichlorohydrin. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Dow Chem Co, Biocatalysis Grp, Midland, MI 48674 USA. Diversa Corp, San Diego, CA USA. Univ Calif Los Alamos Natl Lab, Struct Biol Grp, Div Life Sci, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RI Hickman, Daniel/A-3264-2012 OI Hickman, Daniel/0000-0003-2751-5584 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 34-BIOT BP U164 EP U164 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100766 ER PT J AU Sylwester, ER Allen, PG Zhao, P Viani, BE AF Sylwester, ER Allen, PG Zhao, P Viani, BE TI Interactions of uranium and neptunium with cementitious materials studied by XAFS. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, GT Seaborg Inst Transactinium, Livermore, CA 94551 USA. Univ Calif Lawrence Livermore Natl Lab, Geosci & Environm Technol Div, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 49-NUCL BP U73 EP U73 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200388 ER PT J AU Szempruch, RW McClard, JW AF Szempruch, RW McClard, JW TI Perspective of a problem: History of plutonium storage package failures. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Separat Engn Div, Aiken, SC 29808 USA. Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. B&W Hanford Co, Plutonium Finishing Plant, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 52-NUCL BP U74 EP U74 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200391 ER PT J AU Tandon, L Penneman, RA AF Tandon, L Penneman, RA TI Radiolysis of chloride and sulfate salts in plutonium oxide storage environments. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 53-NUCL BP U74 EP U74 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200392 ER PT J AU Tarver, EE Siems, WF AF Tarver, EE Siems, WF TI External second-gate fourier-transform ion-mobility spectrometry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Livermore, CA 94551 USA. Washington State Univ, Dept Chem, Pullman, WA 99164 USA. NR 0 TC 1 Z9 1 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 227-ANYL BP U119 EP U119 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100542 ER PT J AU Taylor, PA Mattus, CH AF Taylor, PA Mattus, CH TI Thermal and chemical stability of crystalline silicotitanate sorbent. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RI Mattus, Catherine/E-5591-2017 OI Mattus, Catherine/0000-0002-4574-1588 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 255-IEC BP U761 EP U762 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104099 ER PT J AU Thiel, PA Heinzig, MW Anderegg, JW Wehner, BI Sordelet, DJ Glade, S Johnson, WL AF Thiel, PA Heinzig, MW Anderegg, JW Wehner, BI Sordelet, DJ Glade, S Johnson, WL TI X-ray photoelectron spectroscopy studies of bulk metallic glasses. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA. CALTECH, Lab Engn Mat, Pasadena, CA 91125 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 98-PHYS BP U282 EP U282 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201557 ER PT J AU Thiyagarajan, P Li, X Littrell, K Seifert, S Csencsits, R Loong, C AF Thiyagarajan, P Li, X Littrell, K Seifert, S Csencsits, R Loong, C TI Characterization of nanostructured zirconia prepared by hydrolysis and reverse micelle synthesis by small-angle neutron and x-ray scattering. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA. Univ Louisville, Dept Chem Engn, Louisville, KY 40292 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RI Littrell, Kenneth/D-2106-2013 OI Littrell, Kenneth/0000-0003-2308-8618 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 72-FUEL BP U681 EP U682 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103704 ER PT J AU Thomas, SR Meglen, B Davis, M Vollbrecht, EW AF Thomas, SR Meglen, B Davis, M Vollbrecht, EW TI Identification of maize cell-wall mutations using near-IR spectroscopy: Implications for biomass to ethanol conversion. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Cold Spring Harbor Lab, Cold Spring Harbor, NY 11724 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 52-BTEC BP U525 EP U525 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202942 ER PT J AU Thompson, MC AF Thompson, MC TI Where can new ideas for radionuclide separations be found? SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Savannah River Technol Ctr, Actinide Technol Sect, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 163-IEC BP U747 EP U747 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104009 ER PT J AU Todd, TA Herbst, RS Law, JD AF Todd, TA Herbst, RS Law, JD TI Removal of cesium, strontium, and TRU elements from acidic waste using integrated ion exchange and solvent-extraction technologies. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 202-IEC BP U753 EP U753 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104047 ER PT J AU Toth, KS AF Toth, KS TI Particle-decay studies using a recoil mass spectrometer at the Holifield Radioactive Ion Beam Facility. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 34-NUCL BP U71 EP U71 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200373 ER PT J AU Tretiak, S Middleton, C Chernyak, V Mukamel, S AF Tretiak, S Middleton, C Chernyak, V Mukamel, S TI Frenkel exciton Hamiltonian for LH2 photosynthetic antenna. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Rochester, Dept Chem, Rochester, NY USA. RI Chernyak, Vladimir/F-5842-2016 OI Chernyak, Vladimir/0000-0003-4389-4238 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 425-POLY BP U419 EP U419 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202373 ER PT J AU Tretiak, S Martin, RL AF Tretiak, S Martin, RL TI CEO/semiempirical calculations of excited electronic states of conjugated molecules. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 033-COMP BP U593 EP U593 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103200 ER PT J AU Trollsas, M Claesson, H Hedrick, JL Pople, J Gast, A AF Trollsas, M Claesson, H Hedrick, JL Pople, J Gast, A TI Dendrimer-like star polymers: Amplification of dendrimer properties, structural conformation, and hydrodynamic volume. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IBM Res Corp, San Jose, CA 95120 USA. Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA. NR 0 TC 1 Z9 1 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 162-POLY BP U379 EP U379 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202113 ER PT J AU Tsai, SP Frank, JR Datta, R St Martin, EJ Halpern, Y Henry, MP AF Tsai, SP Frank, JR Datta, R St Martin, EJ Halpern, Y Henry, MP TI Advanced biocatalytic and separation processes for the production of a platform chemical intermediate, ethyl lactate, from heterogenous agricultural feedstocks. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 41-BTEC BP U523 EP U523 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202931 ER PT J AU Tsai, SP Fracaro, AT AF Tsai, SP Fracaro, AT TI Transport of neutral species in electrodialysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 91-IEC BP U737 EP U737 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103940 ER PT J AU Tsai, SP Henry, MP Fracaro, AT Moon, P AF Tsai, SP Henry, MP Fracaro, AT Moon, P TI Recovery and purification of fermentation-derived succinic acid. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 210-BIOT BP U203 EP U203 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100937 ER PT J AU Van Hove, MA AF Van Hove, MA TI Surface structure of quasicrystals studied by low-energy and photoelectron diffraction. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, MSD, ALS, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 54-PHYS BP U275 EP U275 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201513 ER PT J AU Van Hove, MA Soares, EA Walters, CF McCarty, KF AF Van Hove, MA Soares, EA Walters, CF McCarty, KF TI Surface structure of alpha-Al2O3(0001) from dynamical leed-enhanced vibrations. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Sandia Natl Labs, Livermore, CA 94550 USA. RI McCarty, Kevin/F-9368-2012; Soares, Edmar/C-2303-2013 OI McCarty, Kevin/0000-0002-8601-079X; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 125-COLL BP U521 EP U521 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102819 ER PT J AU VanBrocklin, HF Gibbs, AR Hanrahan, SM Hom, DL Lim, JK Riese, DJ AF VanBrocklin, HF Gibbs, AR Hanrahan, SM Hom, DL Lim, JK Riese, DJ TI Development of positron labeled epidermal growth factor receptor tyrosine kinase inhibitors: Pet probes for breast cancer. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Ctr Funct Imaging, Berkeley, CA 94720 USA. Purdue Univ, Dept Med Chem & Mol Pharmacol, W Lafayette, IN 47907 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 63-MEDI BP U13 EP U14 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200063 ER PT J AU Velazquez, CMR Hazen, TC AF Velazquez, CMR Hazen, TC TI Chemotaxis pseuomonas fluorecens to 2,4 and 2,6-dinitrotoluene. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pontif Cathol Univ Puerto Rico, Ponce, PR 00731 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Environm Biotechnol, Berkeley, CA 94720 USA. RI Hazen, Terry/C-1076-2012 OI Hazen, Terry/0000-0002-2536-9993 NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 209-CHED BP U319 EP U319 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246101600 ER PT J AU Velsko, CA AF Velsko, CA TI Teaching basic chemical concepts to K-5 students in four sessions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 995-CHED BP U438 EP U438 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102386 ER PT J AU Venkateswaran, KS Langlois, RG AF Venkateswaran, KS Langlois, RG TI Simultaneous analysis of protein, bacterial, and viral antigens using a flow cytometric microarray immunosensor. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 201-ANYL BP U115 EP U115 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246100517 ER PT J AU Vetter, K AF Vetter, K TI New concepts in the detection of gamma radiation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 94-NUCL BP U80 EP U80 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200433 ER PT J AU Vetter, PA AF Vetter, PA TI Experiments in fundamental physics using laser-cooled radioactive samples. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 84-NUCL BP U78 EP U79 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200423 ER PT J AU Vieira, DJ Brice, SJ Crane, SG Guckert, R Hime, A Zhao, XX AF Vieira, DJ Brice, SJ Crane, SG Guckert, R Hime, A Zhao, XX TI Trapping radioactive atoms for a new generation of fundamental symmetry and cold atom experiments. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Lab, Nucl Chem Grp, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. Utah State Univ, Logan, UT 84322 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 81-NUCL BP U78 EP U78 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200420 ER PT J AU Visser, H Anxolabenere-Mallart, E McFarlane, KL Fernandez, C Pizarro, SA Cinco, RM Bergmann, U Cramer, SP Girerd, JJ Sauer, K Klein, MP Yachandra, VK AF Visser, H Anxolabenere-Mallart, E McFarlane, KL Fernandez, C Pizarro, SA Cinco, RM Bergmann, U Cramer, SP Girerd, JJ Sauer, K Klein, MP Yachandra, VK TI Investigation of three redox states of a manganese dinuclear complex modeling the oxidation states of the OEC during its catalytic cycle. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. Univ Paris 11, Chim Inorgan Lab, UMR CNRS 420, F-91405 Orsay, France. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 78-INOR BP U782 EP U783 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104214 ER PT J AU Wagner, A Wardlaw, D Roberston, S AF Wagner, A Wardlaw, D Roberston, S TI Hindered rotational effects in radical-radical reactions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada. Mol Simulat Inc, Cambridge CB5 8RE, England. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 22-PHYS BP U271 EP U271 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201481 ER PT J AU Walker, DD Fink, SD Fondeur, FF Geeting, MW Martin, KB Wilmarth, WR Welch, TD Taylor, PA Mattus, AJ Hunt, RD AF Walker, DD Fink, SD Fondeur, FF Geeting, MW Martin, KB Wilmarth, WR Welch, TD Taylor, PA Mattus, AJ Hunt, RD TI Radiolytic gas generation and retention in a crystalline silicotitanate ion-exchange process. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. Oak Ridge Natl Lab, Oak Ridge, TN USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 256-IEC BP U762 EP U762 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104100 ER PT J AU Wang, HL Wudl, F McBranch, DW Helgeson, R AF Wang, HL Wudl, F McBranch, DW Helgeson, R TI Energy transfer and charge transfer in luminescent self-assembled conjugated polymer superlattices. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Los Angeles, Los Angeles, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 422-COLL BP U577 EP U577 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103115 ER PT J AU Wang, HX Patil, DS Jones, RM Gu, WW Cramer, SP AF Wang, HX Patil, DS Jones, RM Gu, WW Cramer, SP TI L-edge absorption spectroscopy of Ni-Fe hydrogenases: Oxidation states and spin states. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Davis, Dept Appl Sci, Davis, CA 95616 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 65-INOR BP U780 EP U780 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104202 ER PT J AU Wang, Y Vander Wiel, DP Tonkovich, ALY Fitzgerald, SP Marco, JL LaMont, MJ Wegeng, RS AF Wang, Y Vander Wiel, DP Tonkovich, ALY Fitzgerald, SP Marco, JL LaMont, MJ Wegeng, RS TI Engineered catalysts for fuel-processing applications in microchannel reactors. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RI Wang, Yong/C-2344-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 19-CATL BP U530 EP U530 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202966 ER PT J AU Ward, TE Divadeenam, M AF Ward, TE Divadeenam, M TI Potential application of high-energy spallation neutron sources to radioactive seam development and medical isotope production. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Def Programs, Washington, DC 20585 USA. Brookhaven Natl Lab, Dept Appl Technol, Upton, NY 11793 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 117-NUCL BP U84 EP U84 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200456 ER PT J AU Wasinger, EC Hedman, B Hodgson, KO Solomon, EI AF Wasinger, EC Hedman, B Hodgson, KO Solomon, EI TI Using iron L-edge spectroscopy to evaluate ligand field and covalency effects. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Stanford Univ, Dept Chem, Stanford, CA 94305 USA. Stanford Univ, Stanford Synchrotron Radiat Lab, SLAC, Stanford, CA 94305 USA. NR 0 TC 0 Z9 0 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 561-INOR BP U856 EP U856 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104694 ER PT J AU Weston, RE AF Weston, RE TI Oxygen isotope effects in the production and removal of atmospheric carbon monoxide. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 241-PHYS BP U313 EP U314 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201700 ER PT J AU Whitlock, JL Hines, JJ Horwitz, EP Dietz, ML Reba, RC Rotmensch, J AF Whitlock, JL Hines, JJ Horwitz, EP Dietz, ML Reba, RC Rotmensch, J TI Production and applications of (BI)-B-212 generators from U-232/(TH)-T-228: From the laboratory to the clinic SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Chicago, Chicago, IL 60637 USA. Argonne Natl Lab, Dept Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 194-IEC BP U752 EP U752 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104039 ER PT J AU Whitten, DG AF Whitten, DG TI Novel materials resulting from self-assembly: Progress and prospects. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Biosci, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 50-COLL BP U509 EP U509 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102746 ER PT J AU Williams, JA Cooper, WJ Tobien, T Mezyk, SP Bartels, DM AF Williams, JA Cooper, WJ Tobien, T Mezyk, SP Bartels, DM TI Pulse radiolysis of chlorinated acetones. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Dept Chem, Wilmington, NC 28403 USA. Atom Energy Canada Ltd, Whiteshell Labs, Reactor Chem Branch, Pinawa, MB R0E 1L0, Canada. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 158-ENVR BP U643 EP U643 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103493 ER PT J AU Wilmarth, WR Hang, T Walker, DD Mills, JT Dukes, VH Fink, SD AF Wilmarth, WR Hang, T Walker, DD Mills, JT Dukes, VH Fink, SD TI Cesium removal from SRS high-level waste using crystalline silicotitanate-ion exchange. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 254-IEC BP U761 EP U761 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104098 ER PT J AU Wilson, EL AF Wilson, EL TI Material identification and surveillance. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 6-TECH BP U468 EP U468 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246102544 ER PT J AU Winans, RE Blank, JG Ahrens, MJ Grey, GT Hongsresawat, S Miller, GH AF Winans, RE Blank, JG Ahrens, MJ Grey, GT Hongsresawat, S Miller, GH TI Investigation of the stability of amino acids in possible early Earth comet impacts. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 43-GEOC BP U694 EP U694 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103761 ER PT J AU Winans, RE Parker, JT Seifert, S Fletcher, TH AF Winans, RE Parker, JT Seifert, S Fletcher, TH TI Small-angle X-ray scattering study of coal soot formation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Brigham Young Univ, Dept Chem Engn, Provo, UT 84602 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 78-FUEL BP U682 EP U682 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103710 ER PT J AU Woodruff, WH Dyer, RB Bailey, JA Palmer, G Fabian, M Gennis, R Wikstrom, M Puustinen, A AF Woodruff, WH Dyer, RB Bailey, JA Palmer, G Fabian, M Gennis, R Wikstrom, M Puustinen, A TI Spectroscopy, dynamics, and function of heme-copper oxidases. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. Rice Univ, Houston, TX 77005 USA. Univ Illinois, Urbana, IL 61801 USA. Univ Helsinki, Helsinki, Finland. RI Wikstrom, Marten/A-4403-2008 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 456-PHYS BP U345 EP U345 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201914 ER PT J AU Worl, LA Hagan, RC Horrell, DR Martinez, MA McFarlan, J Morris, JS Padilla, DD Smith, CA Veirs, DK AF Worl, LA Hagan, RC Horrell, DR Martinez, MA McFarlan, J Morris, JS Padilla, DD Smith, CA Veirs, DK TI Surveillance of gas generation over plutonium oxides in the 94-1 program. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, NW, MM, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 78-NUCL BP U78 EP U78 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200417 ER PT J AU Wu, CS Schatz, GC Lendvay, G Fang, DC Harding, LB AF Wu, CS Schatz, GC Lendvay, G Fang, DC Harding, LB TI Reaction dynamics of H with H2O using quasiclassical trajectories and a new potential surface. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Northwestern Univ, Evanston, IL 60208 USA. Hungarian Acad Sci, Inst Chem, Chem Res Ctr, Budapest, Hungary. Argonne Natl Lab, Theoret Cheist Grp, Argonne, IL 60439 USA. RI Lendvay, Gyorgy/B-5397-2016 OI Lendvay, Gyorgy/0000-0002-2150-0376 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 383-PHYS BP U335 EP U335 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201842 ER PT J AU Wu, JZ Bratko, D Blanch, HW Prausnitz, JM AF Wu, JZ Bratko, D Blanch, HW Prausnitz, JM TI Two- and three-body interactions among strongly screened macroions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Dept Chem Engn, Berkeley, CA 94720 USA. RI Wu, Jianzhong/I-5164-2013 NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 407-COLL BP U574 EP U574 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103100 ER PT J AU Yabusaki, S Chilakapati, A White, M Rosing, M AF Yabusaki, S Chilakapati, A White, M Rosing, M TI Multicomponent reactive flow and transport beneath a leaking waste tank. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 111-ENVR BP U636 EP U636 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246103447 ER PT J AU Yeh, AT McCusker, JK Shank, CV AF Yeh, AT McCusker, JK Shank, CV TI Ultrafast dynamics and charge localization in tris-(2,2'-bipyridine) ruthenium(II). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Chem, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 429-INOR BP U836 EP U836 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104563 ER PT J AU Yoo, CS AF Yoo, CS TI Polymerization of carbon dioxide at high pressures and temperatures. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Phys H Div, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 122-PHYS BP U285 EP U286 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246201581 ER PT J AU Younes, W AF Younes, W TI Advanced analysis techniques for gamma-ray data. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, N Div, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 98-NUCL BP U81 EP U81 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200437 ER PT J AU Young, JP Shaw, RW Mirzadeh, S AF Young, JP Shaw, RW Mirzadeh, S TI Search for a 3.5 eV gamma emission from 229-thorium. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 139-NUCL BP U87 EP U87 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200476 ER PT J AU Zanner, MA AF Zanner, MA TI National lab and university collaborations: A strategic approach. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Univ Collaborat Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 9-SCHB BP U515 EP U515 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246202881 ER PT J AU Zarate, MA Oswald, WJ AF Zarate, MA Oswald, WJ TI Selenium determination in agricultural drainage treated in an Algal-Bacterial Selenium-Removal System in the San Joaquin Valley of California. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Appl Algae Res Grp, Environm Engn & Hlth Sci Lab, Richmond, CA 94804 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Measurement Lab, Berkeley, CA 94720 USA. RI Quinn, Nigel/G-2407-2015 OI Quinn, Nigel/0000-0003-3333-4763 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 175-IEC BP U749 EP U749 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104021 ER PT J AU Zechmann, CA Boyle, TJ Kemp, RA Rodriguez, MA AF Zechmann, CA Boyle, TJ Kemp, RA Rodriguez, MA TI Synthesis and structural study of magnesium alkoxides and magnesium chloro-alkoxides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87106 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 309-INOR BP U818 EP U818 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 317UV UT WOS:000087246104444 ER PT J AU Zhang, JZ Kreger, MA Cherepy, NJ Scott, JC Klaerner, G Miller, RD McBranch, DW Kraabel, B Xu, S AF Zhang, JZ Kreger, MA Cherepy, NJ Scott, JC Klaerner, G Miller, RD McBranch, DW Kraabel, B Xu, S TI Femtosecond study of exciton dynamics in 9-di-N-hexylfluorene/anthracene random copolymers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RI Cherepy, Nerine/F-6176-2013 OI Cherepy, Nerine/0000-0001-8561-923X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 189-ORGN BP U123 EP U124 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200674 ER PT J AU Zhao, PH Allen, PG Sylwester, ER Brachmann, A Viani, BE AF Zhao, PH Allen, PG Sylwester, ER Brachmann, A Viani, BE TI Partitioning and characterization of uranium(VI) and neptunium(V) in aqueous/hydrothermally altered concrete systems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, GT Seaborg Inst Transactinium Sci, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Geosci & Environm Technol Div, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 26 PY 2000 VL 219 MA 147-NUCL BP U88 EP U89 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 317UW UT WOS:000087246200484 ER PT J AU De Hoop, MV Gautesen, AK AF De Hoop, MV Gautesen, AK TI Uniform asymptotic expansion of the generalized Bremmer series SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE wavefield decomposition; Bremmer series; uniform asymptotics ID MEDIA; MIGRATION AB The Bremmer coupling series solution of the wave equation, in generally inhomogeneous media, requires the introduction of pseudodifferential operators. In this paper, in two dimensions, uniform asymptotic expansions of the Schwartz kernels of these operators are derived. Also, we derive a uniform asymptotic expansion of the one-way propagator appearing in the series. We focus on designing closed-form representations, valid in the high-frequency limit, taking into account critical scattering-angle phenomena. Our expansion is not limited by propagation angle. In principle, the uniform asymptotic expansion of a kernel follows by matching its asymptotic behaviors away from and near its diagonal. The Bremmer series solver consists of three steps: directional decomposition into up- and downgoing waves, one-way propagation, and interaction of the counterpropagating constituents. Each of these steps is represented here by a kernel for which a uniform asymptotic expansion is found. The associated algorithm provides a fundamental improvement of the parabolic-equation and phase-shift/phase-screen style methods applied in ocean acoustics, integrated optics, and exploration seismology. C1 Colorado Sch Mines, Ctr Wave Phenomena, Golden, CO 80401 USA. Colorado Sch Mines, Dept Math & Comp Sci, Golden, CO 80401 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Math, Ames, IA 50011 USA. RP De Hoop, MV (reprint author), Colorado Sch Mines, Ctr Wave Phenomena, Golden, CO 80401 USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD MAR 25 PY 2000 VL 60 IS 4 BP 1302 EP 1329 PG 28 WC Mathematics, Applied SC Mathematics GA 318VK UT WOS:000087304500009 ER PT J AU Ishigami, M Cumings, J Zettl, A Chen, S AF Ishigami, M Cumings, J Zettl, A Chen, S TI A simple method for the continuous production of carbon nanotubes SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CATALYTIC GROWTH; MICROTUBULES AB A simplified are-method is presented which allows for the continuous synthesis of multi-walled carbon nanotubes. In its basic form, the method requires only a de power supply, a graphite electrode, and a container of liquid nitrogen with no need for pumps, seals, water-cooled vacuum chambers, or purge-gas handling systems. High-quality nanotubes are produced in high yield. The system is easily adaptable to produce large quantities of nanotubes continuously without interruptions for electrode replacement, chamber cleaning, or gas purging. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. RP Zettl, A (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Cumings, John/A-3595-2012; Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 21 TC 123 Z9 130 U1 3 U2 26 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 24 PY 2000 VL 319 IS 5-6 BP 457 EP 459 DI 10.1016/S0009-2614(00)00151-2 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 298CL UT WOS:000086121700004 ER PT J AU Du, XL Frei, H Kim, SH AF Du, XL Frei, H Kim, SH TI The mechanism of GTP hydrolysis by Ras probed by fourier transform infrared spectroscopy SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID C-HA-RAS; TRANSITION-STATE; CRYSTAL-STRUCTURE; TYROSINE PHOSPHATASE; PHOSPHORYL-TRANSFER; ATP HYDROLYSIS; P21 PROTEINS; COMPLEX; GDP; NUCLEOTIDES AB Time-resolved Fourier transform infrared spectroscopy (FTIR) in combination with photo-induced release of O-18-labeled caged nucleotide has been employed to address mechanistic issues of GTP hydrolysis by Ras protein. Infrared spectroscopy of Ras complexes with nitrophenylethyl (NPE)-[alpha-O-18(2)]GTP, NPE-[beta-O-18(4)]GTP, or NPE-[gamma-O-18(3)]GTP upon photolysis or during hydrolysis afforded a substantially improved mode assignment of phosphoryl group absorptions. Photolysis spectra of hydroxyphenylacyl-GTP and hydroxyphenylacyl-GDP bound to Ras and several mutants, Ras(Gly(12))-Mn2+, Ras(Pro(12)), Ras(Ala(12)), and Ras(Val(12)), mere obtained and yielded valuable information about structures of GTP or GDP bound to has mutants. IR spectra revealed stronger binding of GDP beta-PO32- moiety by Ras mutants with higher activity, suggesting that the transition state is largely GDP-like, Analysis of the photolysis and hydrolysis FTIR spectra of the [beta-nonbridge-O-18(2), alpha beta-bridge-O-18]GTP isotopomer allowed us to probe for positional isotope exchange. Such a reaction might signal the existence of metaphosphate as a discrete intermediate, a key species for a dissociative mechanism. No positional isotope exchange was observed. Overall, our results support a concerted mechanism, but the transition state seems to have a considerable amount of dissociative character. This work demonstrates that time-resolved FTIR is highly suitable for monitoring positional isotope exchange and advantageous in many aspects over previously used methods, such as P-31 NMR and mass spectrometry. C1 Univ Calif Berkeley, Biophys Grad Program, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Kim, SH (reprint author), Univ Calif Berkeley, Melvin Calvin Lab, Room 220, Berkeley, CA 94720 USA. EM SHKim@LBL.GOV NR 52 TC 70 Z9 70 U1 0 U2 7 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 EI 1083-351X J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 24 PY 2000 VL 275 IS 12 BP 8492 EP 8500 DI 10.1074/jbc.275.12.8492 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 304WU UT WOS:000086507700036 PM 10722686 ER PT J AU Chen, YB Kele, M Tuinman, AA Guiochon, G AF Chen, YB Kele, M Tuinman, AA Guiochon, G TI Comparison of the repeatability of quantitative data measured in high-performance liquid chromatography with UV and atmospheric pressure chemical ionization mass spectrometric detection SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE repeatability; retention time; peak area; column efficiency AB A detailed comparison of the repeatability of the retention times, the peak efficiencies and the peak areas of a dozen probe compounds achieved in HPLC, using either HPLC-UV or HPLC-MS for detection purpose, is reported. Three groups of conventional analytes, each one separated under a different set of experimental conditions, were selected for this study. Most of the compounds are basic, the other ones being neutral. The repeatabilities of the retention times do not exhibit any influence of the mode of detection. However, the repeatabilities of the peak areas and the column efficiencies are generally (although not always) better in HPLC-UV than that in HPLC-MS. On average, the precision for the UV peak area detection was 2.5% versus 6.8% for MS detection. Experimental results show that the response factor of the UV detector is more constant than that of the MS detector, probably because the HPLC flow-rate was sufficiently stable. The results obtained in the different tests are discussed. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 19 TC 7 Z9 7 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAR 24 PY 2000 VL 873 IS 2 BP 163 EP 173 DI 10.1016/S0021-9673(99)01327-8 PG 11 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 296MD UT WOS:000086027400002 PM 10757294 ER PT J AU Adams, MD Celniker, SE Holt, RA Evans, CA Gocayne, JD Amanatides, PG Scherer, SE Li, PW Hoskins, RA Galle, RF George, RA Lewis, SE Richards, S Ashburner, M Henderson, SN Sutton, GG Wortman, JR Yandell, MD Zhang, Q Chen, LX Brandon, RC Rogers, YHC Blazej, RG Champe, M Pfeiffer, BD Wan, KH Doyle, C Baxter, EG Helt, G Nelson, CR Miklos, GLG Abril, JF Agbayani, A An, HJ Andrews-Pfannkoch, C Baldwin, D Ballew, RM Basu, A Baxendale, J Bayraktaroglu, L Beasley, EM Beeson, KY Benos, PV Berman, BP Bhandari, D Bolshakov, S Borkova, D Botchan, MR Bouck, J Brokstein, P Brottier, P Burtis, KC Busam, DA Butler, H Cadieu, E Center, A Chandra, I Cherry, JM Cawley, S Dahlke, C Davenport, LB Davies, A de Pablos, B Delcher, A Deng, ZM Mays, AD Dew, I Dietz, SM Dodson, K Doup, LE Downes, M Dugan-Rocha, S Dunkov, BC Dunn, P Durbin, KJ Evangelista, CC Ferraz, C Ferriera, S Fleischmann, W Fosler, C Gabrielian, AE Garg, NS Gelbart, WM Glasser, K Glodek, A Gong, FC Gorrell, JH Gu, ZP Guan, P Harris, M Harris, NL Harvey, D Heiman, TJ Hernandez, JR Houck, J Hostin, D Houston, DA Howland, TJ Wei, MH Ibegwam, C Jalali, M Kalush, F Karpen, GH Ke, ZX Kennison, JA Ketchum, KA Kimmel, BE Kodira, CD Kraft, C Kravitz, S Kulp, D Lai, ZW Lasko, P Lei, YD Levitsky, AA Li, JY Li, ZY Liang, Y Lin, XY Liu, XJ Mattei, B McIntosh, TC McLeod, MP McPherson, D Merkulov, G Milshina, NV Mobarry, C Morris, J Moshrefi, A Mount, SM Moy, M Murphy, B Murphy, L Muzny, DM Nelson, DL Nelson, DR Nelson, KA Nixon, K Nusskern, DR Pacleb, JM Palazzolo, M Pittman, GS Pan, S Pollard, J Puri, V Reese, MG Reinert, K Remington, K Saunders, RDC Scheeler, F Shen, H Shue, BC Siden-Kiamos, I Simpson, M Skupski, MP Smith, T Spier, E Spradling, AC Stapleton, M Strong, R Sun, E Svirskas, R Tector, C Turner, R Venter, E Wang, AHH Wang, X Wang, ZY Wassarman, DA Weinstock, GM Weissenbach, J Williams, SM Woodage, T Worley, KC Wu, D Yang, S Yao, QA Ye, J Yeh, RF Zaveri, JS Zhan, M Zhang, GG Zhao, Q Zheng, LS Zheng, XQH Zhong, FN Zhong, WY Zhou, XJ Zhu, SP Zhu, XH Smith, HO Gibbs, RA Myers, EW Rubin, GM Venter, JC AF Adams, MD Celniker, SE Holt, RA Evans, CA Gocayne, JD Amanatides, PG Scherer, SE Li, PW Hoskins, RA Galle, RF George, RA Lewis, SE Richards, S Ashburner, M Henderson, SN Sutton, GG Wortman, JR Yandell, MD Zhang, Q Chen, LX Brandon, RC Rogers, YHC Blazej, RG Champe, M Pfeiffer, BD Wan, KH Doyle, C Baxter, EG Helt, G Nelson, CR Miklos, GLG Abril, JF Agbayani, A An, HJ Andrews-Pfannkoch, C Baldwin, D Ballew, RM Basu, A Baxendale, J Bayraktaroglu, L Beasley, EM Beeson, KY Benos, PV Berman, BP Bhandari, D Bolshakov, S Borkova, D Botchan, MR Bouck, J Brokstein, P Brottier, P Burtis, KC Busam, DA Butler, H Cadieu, E Center, A Chandra, I Cherry, JM Cawley, S Dahlke, C Davenport, LB Davies, A de Pablos, B Delcher, A Deng, ZM Mays, AD Dew, I Dietz, SM Dodson, K Doup, LE Downes, M Dugan-Rocha, S Dunkov, BC Dunn, P Durbin, KJ Evangelista, CC Ferraz, C Ferriera, S Fleischmann, W Fosler, C Gabrielian, AE Garg, NS Gelbart, WM Glasser, K Glodek, A Gong, FC Gorrell, JH Gu, ZP Guan, P Harris, M Harris, NL Harvey, D Heiman, TJ Hernandez, JR Houck, J Hostin, D Houston, DA Howland, TJ Wei, MH Ibegwam, C Jalali, M Kalush, F Karpen, GH Ke, ZX Kennison, JA Ketchum, KA Kimmel, BE Kodira, CD Kraft, C Kravitz, S Kulp, D Lai, ZW Lasko, P Lei, YD Levitsky, AA Li, JY Li, ZY Liang, Y Lin, XY Liu, XJ Mattei, B McIntosh, TC McLeod, MP McPherson, D Merkulov, G Milshina, NV Mobarry, C Morris, J Moshrefi, A Mount, SM Moy, M Murphy, B Murphy, L Muzny, DM Nelson, DL Nelson, DR Nelson, KA Nixon, K Nusskern, DR Pacleb, JM Palazzolo, M Pittman, GS Pan, S Pollard, J Puri, V Reese, MG Reinert, K Remington, K Saunders, RDC Scheeler, F Shen, H Shue, BC Siden-Kiamos, I Simpson, M Skupski, MP Smith, T Spier, E Spradling, AC Stapleton, M Strong, R Sun, E Svirskas, R Tector, C Turner, R Venter, E Wang, AHH Wang, X Wang, ZY Wassarman, DA Weinstock, GM Weissenbach, J Williams, SM Woodage, T Worley, KC Wu, D Yang, S Yao, QA Ye, J Yeh, RF Zaveri, JS Zhan, M Zhang, GG Zhao, Q Zheng, LS Zheng, XQH Zhong, FN Zhong, WY Zhou, XJ Zhu, SP Zhu, XH Smith, HO Gibbs, RA Myers, EW Rubin, GM Venter, JC TI The genome sequence of Drosophila melanogaster SO SCIENCE LA English DT Review ID DNA-REPLICATION; CHROMOSOME DYNAMICS; GENE-EXPRESSION; HETEROCHROMATIN; PROTEINS; FAMILY; PREDICTION; CHROMATIN AB The fly Drosophila melanogaster is one of the most intensively studied organisms in biology and serves as a model system for the investigation of many developmental and cellular processes common to higher eukaryotes, including humans. We have determined the nucleotide sequence of nearly all of the similar to 120-megabase euchromatic portion of the Drosophila genome using a whole-genome shotgun sequencing strategy supported by extensive clone-based sequence and a high-quality bacterial artificial chromosome physical map. Efforts are under way to close the remaining gaps; however, the sequence is of sufficient accuracy and Contiguity to be declared substantially complete and to support an initial analysis of genome structure and preliminary gene annotation and interpretation. The genome encodes similar to 13,600 genes, somewhat fewer than the smaller Caenorhabditis elegans genome, but with comparable functional diversity. C1 Celera Genom, Rockville, MD 20850 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, BDGP, Berkeley, CA 94720 USA. Baylor Coll Med, Dept Mol & Human Genet, Human Genome Sequencing Ctr, Houston, TX 77030 USA. Univ Calif Berkeley, Dept Cell & Mol Biol, BDGP, Berkeley, CA 94720 USA. European Mol Biol Lab, European Bioinformat Inst, Cambridge CB10 1SD, England. Neomorph Inc, Berkeley, CA 94710 USA. Genetixxpress Pty Ltd, Sydney, NSW 2108, Australia. IMIM UPF, Dept Med Informat, Barcelona 08003, Spain. Harvard Univ, Dept Mol & Cellular Biol, Cambridge, MA 02138 USA. Washington Univ, Sch Med, Dept Genet, St Louis, MO 63110 USA. FORTH, Inst Mol Biol & Biotechnol, Iraklion, Greece. EMBL, EDGP, Heidelberg, Germany. Univ Calif Berkeley, Dept Cell & Mol Biol, Berkeley, CA 94710 USA. Genoscope, F-91000 Evry, France. Univ Calif Davis, Sect Mol & Cellular Biol, Davis, CA 95618 USA. Univ Cambridge, Dept Genet, Cambridge CB2 3EH, England. Univ Rennes 2, Fac Med, Sch Med, EDGP,CNRS,UPR 41, F-35043 Rennes, France. Stanford Univ, Dept Genet, Stanford, CA 94305 USA. Univ Calif Berkeley, Dept Stat, Berkeley, CA 94720 USA. Univ Autonoma Madrid, CSIC, Ctr Biol Mol Severo Ochoa, EDGP, E-28049 Madrid, Spain. Salk Inst Biol Studies, Mol Biol & Virol Lab, La Jolla, CA 92037 USA. Univ Arizona, Dept Biochem, Tucson, AZ 85721 USA. Univ Arizona, Ctr Insect Sci, Tucson, AZ 85721 USA. Univ Montpellier, Sch Med, EDGP, Inst Genet Humaine,CNRS,CRBM, F-34396 Montpellier 5, France. NICHHD, Mol Genet Lab, NIH, Bethesda, MD 20892 USA. McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada. Univ Maryland, Dept Cell Biol & Mol Genet, College Pk, MD 20742 USA. Inst Genom Res, Rockville, MD 20850 USA. Sanger Ctr, EDGP, Cambridge CB10 1SA, England. Univ Tennessee, Dept Biochem, Memphis, TN 38163 USA. Univ Dundee, Dept Anat & Physiol, EDGP, Dundee DD1 4HN, Scotland. Open Univ, Dept Biol Sci, Milton Keynes MK7 6AA, Bucks, England. Carnegie Inst Sci, HHM Embryol, Baltimore, MD 21210 USA. Motorola Biochip Syst, Tempe, AZ 85284 USA. NICHHD, Cell Biol & Metab Branch, NIH, Bethesda, MD 20892 USA. Univ Calif Berkeley, Howard Hughes Med Inst, BDGP, Berkeley, CA 94720 USA. RP Celera Genom, 45 W Gude Dr, Rockville, MD 20850 USA. RI Holt, Robert/C-3303-2009; Abril Ferrando, Josep/B-3877-2014; Lasko, Paul/C-6761-2014; Berman, Benjamin/D-5942-2014; Marion-Poll, Frederic/D-8882-2011; OI Abril Ferrando, Josep/0000-0001-7793-589X; Lasko, Paul/0000-0002-4037-3501; Marion-Poll, Frederic/0000-0001-6824-0180; Deslattes Mays, Anne/0000-0001-7951-3439; Burtis, Kenneth/0000-0002-9644-3265; Lewis, Suzanna/0000-0002-8343-612X; Rubin, Gerald/0000-0001-8762-8703 FU Howard Hughes Medical Institute; NHGRI NIH HHS [P50-HG00750, U54 HG003273] NR 82 TC 3777 Z9 7203 U1 58 U2 547 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD MAR 24 PY 2000 VL 287 IS 5461 BP 2185 EP 2195 DI 10.1126/science.287.5461.2185 PG 11 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296WE UT WOS:000086049100033 PM 10731132 ER PT J AU Rubin, GM Yandell, MD Wortman, JR Miklos, GLG Nelson, CR Hariharan, IK Fortini, ME Li, PW Apweiler, R Fleischmann, W Cherry, JM Henikoff, S Skupski, MP Misra, S Ashburner, M Birney, E Boguski, MS Brody, T Brokstein, P Celniker, SE Chervitz, SA Coates, D Cravchik, A Gabrielian, A Galle, RF Gelbart, WM George, RA Goldstein, LSB Gong, FC Guan, P Harris, NL Hay, BA Hoskins, RA Li, JY Li, ZY Hynes, RO Jones, SJM Kuehl, PM Lemaitre, B Littleton, JT Morrison, DK Mungall, C O'Farrell, PH Pickeral, OK Shue, C Vosshall, LB Zhang, J Zhao, Q Zheng, XQH Zhong, F Zhong, WY Gibbs, R Venter, JC Adams, MD Lewis, S AF Rubin, GM Yandell, MD Wortman, JR Miklos, GLG Nelson, CR Hariharan, IK Fortini, ME Li, PW Apweiler, R Fleischmann, W Cherry, JM Henikoff, S Skupski, MP Misra, S Ashburner, M Birney, E Boguski, MS Brody, T Brokstein, P Celniker, SE Chervitz, SA Coates, D Cravchik, A Gabrielian, A Galle, RF Gelbart, WM George, RA Goldstein, LSB Gong, FC Guan, P Harris, NL Hay, BA Hoskins, RA Li, JY Li, ZY Hynes, RO Jones, SJM Kuehl, PM Lemaitre, B Littleton, JT Morrison, DK Mungall, C O'Farrell, PH Pickeral, OK Shue, C Vosshall, LB Zhang, J Zhao, Q Zheng, XQH Zhong, F Zhong, WY Gibbs, R Venter, JC Adams, MD Lewis, S TI Comparative genomics of the eukaryotes SO SCIENCE LA English DT Review ID DROSOPHILA-MELANOGASTER; INNATE IMMUNITY; CAENORHABDITIS-ELEGANS; MOLECULAR-CLONING; RECEPTOR FAMILY; CYTOCHROME-C; PROTEIN; GENE; BINDING; GASTRULATION AB A comparative analysis of the genomes of Drosophila melanogaster, Caenorhabditis elegans, and Saccharomyces cerevisiae-and the proteins they are predicted to encode-was undertaken in the context of cellular, developmental, and evolutionary processes. The nonredundant protein sets of flies and worms are similar in size and are only twice that of yeast, but different gene families are expanded in each genome, and the multidomain proteins and signaling pathways of the fly and worm are far more complex than those of yeast. The fly has orthologs to 177 of the 289 human disease genes examined and provides the foundation for rapid analysis of some of the basic processes involved in human disease. C1 Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. Celera Genom, Rockville, MD 20850 USA. Genetixxpress, Sydney, NSW 2108, Australia. Massachusetts Gen Hosp, Ctr Canc, Charlestown, MA 02129 USA. Univ Penn, Sch Med, Dept Genet, Philadelphia, PA 19104 USA. EMBL, EBI, Cambridge CB10 1SD, England. Stanford Univ, Dept Genet, Stanford, CA 94305 USA. Fred Hutchinson Canc Res Ctr, Howard Hughes Med Inst, Seattle, WA 98109 USA. Natl Lib Med, Natl Ctr Biotechnol Informat, NIH, Bethesda, MD 20894 USA. NINDS, Neurogenet Unit, Neurochem Lab, NIH, Bethesda, MD 20892 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. Neomorphic, Berkeley, CA 94710 USA. Univ Leeds, Sch Biol, Leeds LS2 9JT, W Yorkshire, England. Harvard Univ, Dept Mol & Cellular Biol, Cambridge, MA 02138 USA. Univ Calif San Diego, Howard Hughes Med Inst, Dept Cellular & Mol Med, La Jolla, CA 92093 USA. Univ Calif San Diego, Howard Hughes Med Inst, Dept Pharmacol, La Jolla, CA 92093 USA. CALTECH, Div Biol, Pasadena, CA 91125 USA. MIT, Howard Hughes Med Inst, Cambridge, MA 02139 USA. BC Canc Res Ctr, Genome Sequence Ctr, Vancouver, BC V52 4E6, Canada. Univ Maryland, Cell & Mol Biol Program, Baltimore, MD 21201 USA. CNRS, Ctr Genet Mol, F-91198 Gif Sur Yvette, France. MIT, Ctr Learning & Memory, Cambridge, MA 02139 USA. NCI, Regulat Cell Growth Lab, Div Basic Sci, Frederick Canc Res & Dev Ctr,NIH, Ft Detrick, MD 21702 USA. Univ Calif San Francisco, Dept Biochem & Biophys, San Francisco, CA 94143 USA. Columbia Univ, Ctr Neurobiol & Behav, New York, NY 10032 USA. Baylor Coll Med, Human Genome Sequencing Ctr, Dept Mol & Human Genet, Houston, TX 77030 USA. RP Rubin, GM (reprint author), Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA. RI Jones, Steven/C-3621-2009; OI Lewis, Suzanna/0000-0002-8343-612X; O'Farrell, Patrick/0000-0003-0011-2734; Rubin, Gerald/0000-0001-8762-8703 FU NHGRI NIH HHS [P4IHG00739, P50HG00750]; NIGMS NIH HHS [R01 GM037193, R01 GM037193-14, R01 GM037193-15, R01 GM060988, R01 GM060988-01]; NINDS NIH HHS [R01 NS040296, R01 NS040296-01] NR 84 TC 1120 Z9 1153 U1 9 U2 106 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 24 PY 2000 VL 287 IS 5461 BP 2204 EP 2215 DI 10.1126/science.287.5461.2204 PG 12 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296WE UT WOS:000086049100035 PM 10731134 ER PT J AU Rubin, GM Hong, L Brokstein, P Evans-Holm, M Frise, E Stapleton, M Harvey, DA AF Rubin, GM Hong, L Brokstein, P Evans-Holm, M Frise, E Stapleton, M Harvey, DA TI A Drosophila complementary DNA resource SO SCIENCE LA English DT Editorial Material ID EXPRESSED SEQUENCE TAGS AB Collections of nonredundant, full-length complementary DNA (cDNA) clones for each of the model organisms and humans will be important resources for studies of gene structure and function. We describe a general strategy for producing such collections and its implementation, which so far has generated a set of cDNAs corresponding to over 40% of the genes in the fruit fly Drosophila melanogaster. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. RP Rubin, GM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. OI Rubin, Gerald/0000-0001-8762-8703 NR 7 TC 269 Z9 333 U1 1 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 24 PY 2000 VL 287 IS 5461 BP 2222 EP 2224 DI 10.1126/science.287.5461.2222 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296WE UT WOS:000086049100039 PM 10731138 ER PT J AU Schoenlein, RW Chattopadhyay, S Chong, HHW Glover, TE Heimann, PA Shank, CV Zholents, AA Zolotorev, MS AF Schoenlein, RW Chattopadhyay, S Chong, HHW Glover, TE Heimann, PA Shank, CV Zholents, AA Zolotorev, MS TI Generation of femtosecond pulses of synchrotron radiation SO SCIENCE LA English DT Article ID X-RAY PULSES AB Femtosecond synchrotron pulses were generated directly from an electron storage ring. An ultrashort Laser pulse was used to modulate the energy of electrons within a 100-femtosecond slice of the stored 30-picosecond electron bunch. The energy-modulated electrons were spatially separated from the long bunch and used to generate similar to 300-femtosecond synchrotron pulses at a bend-magnet beamline, with a spectral range from infrared to x-ray wavelengths. The same technique can be used to generate similar to 100-femtosecond x-ray pulses of substantially higher flux and brightness with an undulator, Such synchrotron-based femtosecond x-ray sources offer the possibility of applying x-ray techniques on an ultrafast time scale to investigate structural dynamics in condensed matter. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. Univ Calif Berkeley, Appl Sci & Technol Grad Grp, Berkeley, CA 94720 USA. RP Schoenlein, RW (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. EM rwschoenlein@lbi.gov RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 16 TC 398 Z9 400 U1 4 U2 56 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 24 PY 2000 VL 287 IS 5461 BP 2237 EP 2240 DI 10.1126/science.287.5461.2237 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296WE UT WOS:000086049100043 ER PT J AU Hoskins, RA Nelson, CR Berman, BP Laverty, TR George, RA Ciesiolka, L Naeemuddin, M Arenson, AD Durbin, J David, RG Tabor, PE Bailey, MR DeShazo, DR Catanese, J Mammoser, A Osoegawa, K de Jong, PJ Celniker, SE Gibbs, RA Rubin, GM Scherer, SE AF Hoskins, RA Nelson, CR Berman, BP Laverty, TR George, RA Ciesiolka, L Naeemuddin, M Arenson, AD Durbin, J David, RG Tabor, PE Bailey, MR DeShazo, DR Catanese, J Mammoser, A Osoegawa, K de Jong, PJ Celniker, SE Gibbs, RA Rubin, GM Scherer, SE TI A BAC-based physical map of the major autosomes of Drosophila melanogaster SO SCIENCE LA English DT Article ID YEAST ARTIFICIAL CHROMOSOMES; GENOME; CLONES; CONTIGS AB We constructed a bacterial artificial chromosome (BAC)-based physical map of chromosomes 2 and 3 of Drosophila melanogaster, which constitute 81% of the genome. Sequence tagged site (STS) content, restriction fingerprinting, and polytene chromosome in situ hybridization approaches were integrated to produce a map spanning the euchromatin. Three of five remaining gaps are in repeat-rich regions near the centromeres. A tiling path of clones spanning this map and STS maps of chromosomes X and 4 was sequenced to low coverage; the maps and tiling path sequence were used to support and verify the whole-genome sequence assembly, and tiling path BACs were used as templates in sequence finishing. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. Baylor Coll Med, Human Genome Sequencing Ctr, Houston, TX 77030 USA. Roswell Pk Canc Inst, Dept Canc Genet, Buffalo, NY 14263 USA. RP Hoskins, RA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Drosophila Genome Project, Berkeley, CA 94720 USA. EM hoskins@bdgp.lbl.gov RI Berman, Benjamin/D-5942-2014; OI Rubin, Gerald/0000-0001-8762-8703 FU NHGRI NIH HHS [HG00750] NR 24 TC 98 Z9 102 U1 2 U2 9 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 24 PY 2000 VL 287 IS 5461 BP 2271 EP 2274 DI 10.1126/science.287.5461.2271 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296WE UT WOS:000086049100053 PM 10731150 ER PT J AU Melius, CF Allendorf, MD AF Melius, CF Allendorf, MD TI Bond additivity corrections for quantum chemistry methods SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID ENERGIES; THERMOCHEMISTRY; MOLECULES AB New bond additivity correction (BAC) methods have been developed li,I the G2 method, BAC-G?, as well as for a hybrid density functional theory (DFT) Moller-Plesset (MP)2 method, BAG-hybrid. These BAC methods use a new form of BAC corrections, involving atomic, molecular, and bond-wise additive terms. These terms enable one to treat positive and negative ions as well as neutrals. The BAC-G2 method reduces errors in the G2 method due to nearest-neighbor bonds. The parameters within the BAC-G2 method only depend on atom types. Thus the BAC-G2 method can be used to determine the parameters needed by BAG methods involving lower levels of theory, such as BAC-hybrid and BAC-MP4. The BAG-hybrid method is expected to scale well for large molecules. The BAC-hybrid method uses the differences between the DFT and MP2 predictions as an indication of the method's accuracy, whereas the BAC-G2 method uses its internal methods (G1 and G2MP2) to accomplish this. A statistical analysis of the error in each of the methods is presented on the basis of calculations performed for large sets (more than 120) of molecules. C1 Sandia Natl Labs, Livermore, CA 94551 USA. RP Melius, CF (reprint author), Sandia Natl Labs, Livermore, CA 94551 USA. EM melius@ca.sandia.gov NR 21 TC 34 Z9 34 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2168 EP 2177 DI 10.1021/jp9914370 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300003 ER PT J AU Jarek, RL Miles, TD Trester, ML Denson, SC Shin, SK AF Jarek, RL Miles, TD Trester, ML Denson, SC Shin, SK TI Solvation of Li+ by acetone, THF, and diethyl ether in the gas phase and the ion-molecule association mechanism SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID COLLISION-INDUCED DISSOCIATION; EQUILIBRIUM STRUCTURES; RADIATIVE ASSOCIATION; MASS-SPECTROMETRY; CRYSTAL-STRUCTURE; BINDING-ENERGIES; ALKALI IONS; DONOR BASES; PI-DONOR; COMPLEXES AB Fourier transform ion cyclotron resonance spectrometry has been employed to study the solvation of the Li+ ion with acetone, tetrahydrofuran (THF), and diethyl ether (DEE) in the gas phase. LiILi+ triple ions are produced in the ICR cell by the laser desorption ionization of a lithium iodine/dibenzo-18-crown-6-ether matrix pasted on a Teflon substrate. All O donors abstract Li+ from the triple ion and form solvated complexes with a maximum solvation number of three at room temperature, around 10(-6) Torr. All third solvent binding energies are determined from van't Hoff plots. Structures and energetics of the Li+.(S)(n) complexes, where n = 1-4 for acetone and THF and n = 1-3 for DEE. have been calculated at the Hartree-Fock level with a 6-311+G(d,p) basis set. Solvation enthalpies and free energies are calculated, and solvent binding enthalpies are compared with experiments. The kinetics of solvent exchange and the association reactions of Li+.(acetone-h(6))(acetone-d(6)) with a 1:1 acetone-h(6)/acetone-d(6) mixture have been measured as a function of pressure. The lifetime of the collision complexes are derived and compared with phase space theory calculations. The isotope effect on the radiative cooling rate is discussed. C1 Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA. Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, Kyoungbuk, South Korea. RP Shin, SK (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RI Shin, Seung Koo/D-2670-2012 OI Shin, Seung Koo/0000-0002-8294-2119 NR 34 TC 25 Z9 25 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2230 EP 2237 DI 10.1021/jp9908193 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300011 ER PT J AU Fedorov, DG Gordon, MS AF Fedorov, DG Gordon, MS TI A theoretical study of the reaction paths for cobalt cation plus propane SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID H BOND ACTIVATIONS; MEDIATED C-C; ELECTRONIC-STRUCTURE; CO+; COMPLEXES; ALKANES AB The triplet potential energy surface for the reaction of cobalt cation with propane has been studied along the two main reaction pathways leading to the formation of (i) hydrogen and propene and (ii) methane and ethene. Effective core potentials for all elements have been used for all calculations. The geometries have been optimized at the complete active space self-consistent field (CASSCF) level of theory, and the final energetics have been refined at the multireference second-order perturbation theory (MRMP2) level with polarization function augmented basis sets. Reasonable agreement with the experimental energetics has been obtained, and the predicted mechanism is consistent with the experimentally determined mechanism of Haynes, Fisher, and Armentrout (J. Phys. Chem. 1996, 100, 18300). C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Gordon, MS (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. NR 14 TC 12 Z9 12 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2253 EP 2260 DI 10.1021/jp9932766 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300014 ER PT J AU van Mourik, T Dunning, TH Peterson, KA AF van Mourik, T Dunning, TH Peterson, KA TI Ab initio characterization of the HCOx (x = -1, 0, +1) species: Structures, vibrational frequencies, CH bond dissociation energies, and HCO ionization potential and electron affinity SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID INFRARED-LASER SPECTROSCOPY; FORMYL RADICAL HCO; UNIMOLECULAR DISSOCIATION; PHOTOELECTRON-SPECTROSCOPY; FLUORESCENCE EXCITATION; EQUILIBRIUM GEOMETRY; MICROWAVE-SPECTRUM; RESONANCE ENERGIES; PROTON AFFINITIES; FUNDAMENTAL-BAND AB The potential energy surfaces of the HCOx (x = +1, 0, -1) species near their equilibrium geometries have been calculated employing coupled cluster methods with augmented correlation consistent basis sets. The equilibrium structures, vibrational frequencies, zero point energies, and dissociation energies were computed for all three species. Valence-electron CCSD(T) calculations with the aug-cc-pV5Z basis set predict CH bond dissociation energies, D-0, of 140.3 kcal/mol for HCO+, 14.0 kcal/mol for HCO, and 4.5 kcal/mol for HCO-, in good agreement with experiment (140.1 +/- 1, 13.9-14.3, and 5.2 +/- 0.2 kcal/mol, respectively). The same calculations predict the electron affinity, EA(0), and ionization potential, IP0, of HCO to be 7.7 and 187.3 kcal/mol; these values are within 0.5 kcal/mol of the measured values. Inclusion of core-valence correlation corrections has only a minor effect on the calculated energetics. C1 Washington State Univ, Dept Chem, Richland, WA 99352 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Peterson, KA (reprint author), Washington State Univ, Dept Chem, POB 999,Mail Stop K8-91, Richland, WA 99352 USA. RI van Mourik, Tanja/A-4007-2008 NR 76 TC 21 Z9 21 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2287 EP 2293 DI 10.1021/jp9925583 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300019 ER PT J AU Pederson, LA Schatz, GC Hollebeek, T Ho, TS Rabitz, H Harding, LB AF Pederson, LA Schatz, GC Hollebeek, T Ho, TS Rabitz, H Harding, LB TI Potential energy surface of the (A)over-tilde state of NH2 and the role of excited states in the N(D-2)+H-2 reaction SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID DISTRIBUTIONS; N(2(2)D); H2O; H-2 AB We present a global potential energy surface for the (A) over bar state of NH2 (1(2)A') based on application of the reproducing kernel Hilbert space (RMS) interpolation method to high-quality ab initio (multireference configuration-interaction) results. This surface correlates adiabatically to the a(1)Delta state of NH, with a reaction endoergicity of about 8 kcal/mol, but it can also lead to formation of ground-state NH (exoergic by 29 kcal/mol) via nonadiabatic (Renner-Teller) interactions for linear HNH geometries that lie near the bottom of a 94 kcal/mol deep well that is accessible from N(D-2) + H-2 by insertion over a 3.4 kcal/mol barrier. This insertion barrier is about 1 kcal/mol higher in energy than the corresponding insertion barrier associated with the ground state of NH2(1(2)A "). As a result, the A state contributes measurably to both the thermal rate constant for N(D-2) + H-2 and the rate for NH(a(1)Delta) production. Extensive quasiclassical trajectory calculations are performed on the RKHS surface to study the N(2D) + H-2 reaction dynamics, with the nonadiabatic rate constant estimated using a capture model. We find that the cross section for ground-state NH production is comparable to that obtained on the ground-state 1A " surface, except for a 1 kcal/mol shift upward in the effective threshold due to the different barrier height. The cross section for NH(a(1)Delta) production has a higher threshold energy and is about 15% of the ground-state cross section at energies well above threshold. C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Princeton Univ, Dept Chem, Princeton, NJ 08544 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Schatz, GC (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA. NR 23 TC 67 Z9 67 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2301 EP 2307 DI 10.1021/jp9924575 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300021 ER PT J AU Dixon, DA Feller, D Peterson, KA Gole, JL AF Dixon, DA Feller, D Peterson, KA Gole, JL TI The molecular structure and ionization potential of Si-2: The role of the excited states in the photoionization of Si-2 SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; WAVE-FUNCTIONS; BENCHMARK CALCULATIONS; SYSTEMATIC SEQUENCES; ELECTRONIC-STRUCTURE; DIATOMIC HYDRIDES; SILICON CLUSTERS; SPECTROSCOPY; ENERGY; HEATS AB The ionization potentials (IP) of Si-2 (X (3)Sigma(g)(-)) to form the X (4)Sigma(g)(-) and a(2)Pi(u) states of Si-2(+) have been calculated at very high levels of ab initio molecular orbital theory (CCSD(T) with augmented correlation-consistent basis sets extrapolated to the complete basis set limit). The calculated value of the IP to form the X (4)Sigma(g)(-) ground state of the ion is 7.913 eV as compared to an experimental value of 7.9206 eV. The a(2)Pi(u) stare is predicted to lie 0.52 eV above the X (4)Sigma(g)(-) ground state of Si-2(+). The 1 (3)Delta(u), 2 (3)Delta(u), H (3)Sigma(u)(-), and K (3)Sigma(u)(-) excited states of Si-2, as well as the X (4)Sigma(g)(-), a(2)Pi(u), and 2(2)Pi(u) states of Si-2(+), have been calculated at the multireference configuration interaction level. The agreement of the calculated positions of the states with the known experimental values is quite good (better than 0.1 eV. The calculated wave functions fur the excited states of Si-2 show significant multireference character. This is especially true for the H state which has been used as an intermediate state in photoionization experiments. The multireference character of the H state readily allows the connection of this state to the ground X (4)Sigma(g)(-) electronic state of Si-2(+) via a one electron photoionization process. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Washington State Univ, Dept Chem, Richland, WA 99352 USA. Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA. RP Dixon, DA (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, POB 999, Richland, WA 99352 USA. NR 52 TC 19 Z9 19 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2326 EP 2332 DI 10.1021/jp992078b PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300023 ER PT J AU Klippenstein, SJ Harding, LB AF Klippenstein, SJ Harding, LB TI A summary of "A direct transition state theory based study of methyl radical recombination kinetics" SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID HIGH-PRESSURE; REACTION CH3+CH3->C2H6; RATE-CONSTANT; ASSOCIATION REACTIONS; MASTER EQUATION; GLOBAL FITS; DISSOCIATION; CRITERION; QUANTUM; SURFACE AB Multireference configuration interaction based quantum chemical calculations are directly implemented in a variational transition state theory based analysis of the kinetics of methyl radical recombination. Separations ranging from 1.9 to 5.5 Angstrom are considered for two separate forms for the reaction coordinate. The a priori prediction for the high-pressure limit rate constant gradually decreases with increasing temperature, with a net decrease of a factor of 1.7 from 300 to 1700 K. Near room temperature, this theoretical estimate is in quantitative agreement with the experimental data. At higher temperatures, comparison between theory and experiment requires a model for the pressure dependence. Master equation calculations employing the exponential down energy transfer model suggest that the theoretical and experimental high-pressure limits gradually diverge with increasing temperature, with the former being about 3 times greater than the latter at 1700 K. The comparison with experiment also suggests that the energy transfer coefficient, , increases with increasing temperature. C1 Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Klippenstein, SJ (reprint author), Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA. OI Klippenstein, Stephen/0000-0001-6297-9187 NR 42 TC 7 Z9 7 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2351 EP 2354 DI 10.1021/jp000120t PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300026 ER PT J AU Henson, NJ Hay, PJ Redondo, A AF Henson, NJ Hay, PJ Redondo, A TI Computational studies of cobalt-substituted aluminophosphates SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID DIFFUSE-REFLECTANCE SPECTROSCOPY; MOLECULAR-SIEVE; INTERATOMIC POTENTIALS; X-RAY; CATALYSTS; COAPO-5; FRAMEWORK; ZEOLITES; ACIDITY; MODELS AB Electronic structure calculations have been performed on a number of models for cobalt substituted aluminophosphates (or CoAPOs) using density functional theory. A number of different cluster models of CoAPOs were constructed and used for the calculations. Our results predict that the high-spin forms of cobalt in tetrahedral coordination are the most stable in agreement with previous electron spin resonance measurements. Also, we find that the structural parameters obtained from geometry optimizations are in good agreement with X-ray absorption experiments (EXAFS). For example, for models of CoAPO compounds with cobalt in the reduced Co(II) oxidation state we calculate the Co-O bond length to be ca. 1.94 Angstrom from cluster calculation as compared to 1.90 Angstrom from EXAFS measurements on reduced CoAPO-18. Our calculations also show the necessity of applying constraints when considering cluster models to correctly represent the local environment around the transition metal, and we have developed a method using atomistic shell-model calculations to obtain reasonable constraints for this purpose. We have calculated the thermochemistry of a likely initiation step for partial oxidation with a number of substrates. It is found that the reaction is more favorable when an additional ligand, H2O or hydroxyl, is introduced into the cobalt coordination sphere forming a five-coordinate local geometry, and that also considerable stabilization of the resulting alkyl radical can be achieved by the formation of a metal-carbon bond. Additionally, it can be noted that although for reproduction of EXAFS data for four-coordinated cobalt models, smaller cluster are sufficient, when considering the energetics of five-coordinated cobalt species, larger cluster are needed to avoid the formation of unrealistic fragment products. We have also investigated the interaction of small molecules (O-2 and CH3CN) with the cobalt center. Whereas we find no evidence for a stable intermediate involving direct coordination of molecular oxygen, our results with acetonitrile show good agreement with previous EXAFS measurements on CoAPO-5/CH3CN. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Henson, NJ (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 61 TC 10 Z9 10 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 23 PY 2000 VL 104 IS 11 BP 2423 EP 2431 DI 10.1021/jp991798f PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 296LF UT WOS:000086025300035 ER PT J AU Firestone, MA Tiede, DM Seifert, S AF Firestone, MA Tiede, DM Seifert, S TI Magnetic field-induced ordering of a polymer-grafted biomembrane-mimetic hydrogel SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID INTEGRAL MEMBRANE-PROTEINS; LIQUID-CRYSTALLINE MEDIUM; PHOSPHOLIPID-BILAYERS; LIPID BILAYERS; NMR; MACROMOLECULES; SPECTROSCOPY; ORIENTATION; DICHROISM; PARAMETER AB A biomembrane-mimetic complex fluid that spontaneously orients in the presence of a magnetic field to yield a highly ordered lamellar structure is described. Macroscopically oriented lamellae were produced by exploiting the inverted thermoreversible phase transition of the material, that is, by aligning the sample below the phase transition temperature (<16 degrees C) (i.e., in the fluid, hexagonal micellar phase) and warming to produce the lamellar gel phase in a 7.05 T magnetic field. The in situ field-induced alignment was studied by deuterium NMR. The lamellar domains were found to preferentially orient perpendicular to the applied field (negative order). Characterization of the magnetic field-induced anisotropy by polarized optical microscopy and small-angle X-ray scattering/diffraction (SAXS) indicates that it persists even upon field termination. The directional alignment was flipped by 90 degrees, with the lamellar domains oriented parallel to the field (positive order), simply by modifying the composition through the addition of a lanthanide ion (Eu3+). The system offers the opportunity to spacially organize both membrane and aqueous soluble proteins in an anisotropic matrix, thereby facilitating structure and dynamic studies using a range of techniques, including magnetic resonance (both NMR as well as EPR), optical spectroscopy, and small-angle neutron and X-ray scattering. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Firestone, MA (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 32 TC 24 Z9 25 U1 3 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 23 PY 2000 VL 104 IS 11 BP 2433 EP 2438 DI 10.1021/jp993591s PG 6 WC Chemistry, Physical SC Chemistry GA 296KT UT WOS:000086024100001 ER PT J AU Lee, I Lee, JW Stubna, A Greenbaum, E AF Lee, I Lee, JW Stubna, A Greenbaum, E TI Measurement of electrostatic potentials above oriented single photosynthetic reaction centers SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID PROBE FORCE MICROSCOPY; PHOTOSYSTEM-I; ANGSTROM RESOLUTION; SURFACE; PLATINIZATION; ORGANIZATION; ELECTRONICS; CONTRAST; DEVICES; SYSTEM AB Photosystem I (PS I) reaction centers are nanometer-size robust supramolecular structures that can be isolated and purified from green plants. Using the technique of Kelvin force probe microscopy, we report here the first measurement of exogenous photovoltages generated from single PS I reaction centers in a heterostructure composed of PS I, organosulfur molecules, and atomically flat gold. Illumination of the reaction centers was achieved with a diode laser at lambda = 670 nm. Data sets consisting of 22 individual PS Is measured entirely under laser illumination, 12 PS Is measured entirely in darkness, and four PS Is in which the light-dark transition occurred in midscan of a single PS I were obtained. The average values of the light minus dark voltages relative to the substrate for the four PS Is were -1.13 +/- 0.14 and -1.20 +/- 0.19 V at diametrical peripheries' and -0.97 +/- 0.04 V at the center. Under illumination, the potentials of the central region of the PS Is were typically more positive than the periphery by 6-9 kT, where kT is the Boltzmann energy at room temperature. These energies suggest a possible mechanism whereby negatively charged ferredoxin, the soluble electron carrier from PS I to the Calvin-Benson cycle, is anchored and positioned at the reducing end of PS I for electron transfer. The results are placed in context with the prior experimental literature on the structure of the reducing end of PS I. C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Elect Engn, Knoxville, TN 37996 USA. RP Greenbaum, E (reprint author), Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. EM greenbaume@ornl.gov NR 25 TC 65 Z9 65 U1 4 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 23 PY 2000 VL 104 IS 11 BP 2439 EP 2443 DI 10.1021/jp994119+ PG 5 WC Chemistry, Physical SC Chemistry GA 296KT UT WOS:000086024100002 ER PT J AU Tollestrup, AV AF Tollestrup, AV TI Robert Rathbun Wilson (1914-2000) - Obituary SO NATURE LA English DT Biographical-Item C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tollestrup, AV (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 23 PY 2000 VL 404 IS 6776 BP 350 EP 350 DI 10.1038/35006208 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 298BG UT WOS:000086119000035 ER PT J AU Knill, E Laflamme, R Martinez, R Tseng, CH AF Knill, E Laflamme, R Martinez, R Tseng, CH TI An algorithmic benchmark for quantum information processing SO NATURE LA English DT Article ID COMPUTATION; NMR; RESONANCE; COMPUTER AB Quantum information processing offers potentially great advantages over classical information processing, both for efficient algorithms(1,2) and for secure communication(3,4). Therefore, it is important to establish that scalable control of a large number of quantum bits (qubits) can be achieved in practice. There are a rapidly growing number of proposed device technologies(5-11) for quantum information processing. Of these technologies, those exploiting nuclear magnetic resonance (NMR) have been the first to demonstrate non-trivial quantum algorithms with small numbers of qubits(12-16). To compare different physical realizations of quantum information processors, it is necessary to establish benchmark experiments that are independent of the underlying physical system, and that demonstrate reliable and coherent control of a reasonable number of qubits. Here we report an experimental realization of an algorithmic benchmark using an NMR technique that involves coherent manipulation of seven qubits. Moreover, our experimental procedure can be used as a reliable and efficient method for creating a standard pseudopure state, the first step for implementing traditional quantum algorithms in liquid state NMR systems. The benchmark and the techniques can be adapted for use with other proposed quantum devices. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. MIT, Dept Nucl Engn, Cambridge, MA 02139 USA. RP Knill, E (reprint author), Los Alamos Natl Lab, MS B265, Los Alamos, NM 87545 USA. EM knill@lanl.gov NR 30 TC 172 Z9 183 U1 2 U2 20 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD MAR 23 PY 2000 VL 404 IS 6776 BP 368 EP 370 DI 10.1038/35006012 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 298BG UT WOS:000086119000043 ER PT J AU Aggarwal, MM Agnihotri, A Ahammed, Z Angelis, ALS Antonenko, V Arefiev, V Astakhov, V Avdeitchikov, V Awes, TC Baba, PVKS Badyal, SK Baldine, A Barabach, L Barlag, C Bathe, S Batiounia, B Bernier, T Bhalla, KB Bhatia, VS Blume, C Bock, R Bohne, EM Borocz, Z Bucher, D Buijs, A Busching, H Carlen, L Chalyshev, V Chattopadhyay, S Cherbatchev, R Chujo, T Claussen, A Das, AC Decowski, MP Delagrange, H Djordjadze, V Donni, P Doubovik, I Dutt, S Majumdar, MRD El Chenawi, K Eliseev, S Enosawa, K Foka, P Fokin, S Frolov, V Ganti, MS Garpman, S Gavrishchuk, O Geurts, FJM Ghosh, TK Glasow, R Gupta, SK Guskov, B Gustafsson, HA Gutbrod, HH Higuchi, R Hrivnacova, I Ippolitov, M Kalechofsky, H Kamermans, R Kampert, KH Karadjev, K Karpio, K Kato, S Kees, S Kolb, BW Kosarev, I Koutcheryaev, I Krumpel, T Kugler, A Kulinich, P Kurata, M Kurita, K Kuzmin, N Langbein, I Lebedev, A Lee, YY Lohner, H Luquin, L Mahapatra, DP Manko, V Martin, M Martinez, G Maximov, A Mehdiyev, R Mgebrichvili, G Miake, Y Mikhalev, D Mir, MF Mishra, GC Miyamoto, Y Mohanty, B Morrison, D Mukhopadhyay, DS Myalkovski, V Naef, H Nandi, BK Nayak, SK Nayak, TK Neumaier, S Nianine, A Nikitine, V Nikolaev, S Nilsson, P Nishimura, S Nomokonov, P Nystrand, J Obenshain, FE Oskarsson, A Otterlund, I Pachr, M Parfenov, A Pavliouk, S Peitzmann, T Petracek, V Plasil, F Pinganaud, W Purschke, ML Rak, J Raniwala, R Raniwala, S Ramamurthy, VS Rao, NK Retiere, F Reygers, K Roland, G Rosselet, L Roufanov, I Roy, C Rubio, JM Sako, H Sambyal, SS Santo, R Sato, S Schlagheck, H Schmidt, HR Schutz, Y Shabratova, G Shah, TH Sibiriak, I Siemiarczuk, T Silvermyr, D Sinha, BC Slavine, N Soderstrom, K Solomey, N Sorensen, SP Stankus, P Stefanek, G Steinberg, P Stenlund, E Stuken, D Sumbera, M Svensson, T Trivedi, MD Tsvetkov, A Tykarski, L Urbahn, J van der Pijll, EC van Eijndhoven, N van Nieuwenhuizen, GJ Vinogradov, A Viyogi, YP Vodopianov, A Voros, S Wyslouch, B Yagi, K Yokota, Y Young, GR AF Aggarwal, MM Agnihotri, A Ahammed, Z Angelis, ALS Antonenko, V Arefiev, V Astakhov, V Avdeitchikov, V Awes, TC Baba, PVKS Badyal, SK Baldine, A Barabach, L Barlag, C Bathe, S Batiounia, B Bernier, T Bhalla, KB Bhatia, VS Blume, C Bock, R Bohne, EM Borocz, Z Bucher, D Buijs, A Busching, H Carlen, L Chalyshev, V Chattopadhyay, S Cherbatchev, R Chujo, T Claussen, A Das, AC Decowski, MP Delagrange, H Djordjadze, V Donni, P Doubovik, I Dutt, S Majumdar, MRD El Chenawi, K Eliseev, S Enosawa, K Foka, P Fokin, S Frolov, V Ganti, MS Garpman, S Gavrishchuk, O Geurts, FJM Ghosh, TK Glasow, R Gupta, SK Guskov, B Gustafsson, HA Gutbrod, HH Higuchi, R Hrivnacova, I Ippolitov, M Kalechofsky, H Kamermans, R Kampert, KH Karadjev, K Karpio, K Kato, S Kees, S Kolb, BW Kosarev, I Koutcheryaev, I Krumpel, T Kugler, A Kulinich, P Kurata, M Kurita, K Kuzmin, N Langbein, I Lebedev, A Lee, YY Lohner, H Luquin, L Mahapatra, DP Manko, V Martin, M Martinez, G Maximov, A Mehdiyev, R Mgebrichvili, G Miake, Y Mikhalev, D Mir, MF Mishra, GC Miyamoto, Y Mohanty, B Morrison, D Mukhopadhyay, DS Myalkovski, V Naef, H Nandi, BK Nayak, SK Nayak, TK Neumaier, S Nianine, A Nikitine, V Nikolaev, S Nilsson, P Nishimura, S Nomokonov, P Nystrand, J Obenshain, FE Oskarsson, A Otterlund, I Pachr, M Parfenov, A Pavliouk, S Peitzmann, T Petracek, V Plasil, F Pinganaud, W Purschke, ML Rak, J Raniwala, R Raniwala, S Ramamurthy, VS Rao, NK Retiere, F Reygers, K Roland, G Rosselet, L Roufanov, I Roy, C Rubio, JM Sako, H Sambyal, SS Santo, R Sato, S Schlagheck, H Schmidt, HR Schutz, Y Shabratova, G Shah, TH Sibiriak, I Siemiarczuk, T Silvermyr, D Sinha, BC Slavine, N Soderstrom, K Solomey, N Sorensen, SP Stankus, P Stefanek, G Steinberg, P Stenlund, E Stuken, D Sumbera, M Svensson, T Trivedi, MD Tsvetkov, A Tykarski, L Urbahn, J van der Pijll, EC van Eijndhoven, N van Nieuwenhuizen, GJ Vinogradov, A Viyogi, YP Vodopianov, A Voros, S Wyslouch, B Yagi, K Yokota, Y Young, GR CA WA98 Collaboration TI Delta(++) production in 158 A GeV Pb-208+Pb-208 interactions at the CERN SPS SO PHYSICS LETTERS B LA English DT Article DE ultra-relativistic heavy ion collisions; Delta(++) resonance production; mixed event technique; freeze-out temperature ID HEAVY-ION COLLISIONS; MULTISTEP AVALANCHE CHAMBERS; ABUNDANCE; READOUT; PIONS AB The Delta(++)-resonance production in central 158 A GeV Pb-208 + Pb-208 collisions at the CERN SPS has been studied. The Delta(++) production was estimated from the invariant mass spectrum of p pi(+)-pairs by subtracting a mixed event background. The measured Delta(++) abundance is compared with the results from other experiments at lower energies, and with a model calculation assuming thermal and chemical equilibrium. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Panjab Univ, Chandigarh 160014, India. Univ Rajasthan, Jaipur 302004, Rajasthan, India. Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Calcutta 700064, W Bengal, India. Univ Geneva, CH-1211 Geneva 4, Switzerland. RRC Kurchatov Inst, RU-123182 Moscow, Russia. Joint Inst Nucl Res, RU-141980 Dubna, Russia. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Jammu, Jammu 180001, India. Univ Munster, D-48149 Munster, Germany. Ecole Mines, SUBATECH, Nantes, France. Gesell Schwerionenforsch, GSI, D-64220 Darmstadt, Germany. Univ Utrecht, NIKHEF, NL-3508 TA Utrecht, Netherlands. Univ Lund, SE-22100 Lund, Sweden. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Inst Nucl Phys, CZ-25068 Rez, Czech Republic. Univ Groningen, KVI, NL-9747 AA Groningen, Netherlands. Inst Nucl Studies, PL-00681 Warsaw, Poland. MIT, Cambridge, MA 02139 USA. Inst Phys, Bhubaneswar 751005, Orissa, India. Univ Tennessee, Knoxville, TN 37966 USA. RP Aggarwal, MM (reprint author), Panjab Univ, Chandigarh 160014, India. RI Decowski, Patrick/A-4341-2011; Peitzmann, Thomas/K-2206-2012; Mehdiyev, Rashid/H-6299-2013; Lohner, Herbert/B-2397-2014; Sumbera, Michal/O-7497-2014 OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X; Sumbera, Michal/0000-0002-0639-7323 NR 19 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 23 PY 2000 VL 477 IS 1-3 BP 37 EP 44 DI 10.1016/S0370-2693(00)00224-0 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 299MU UT WOS:000086203000005 ER PT J AU Melnikov, K Nguyen, F Valeriani, B Venanzoni, G AF Melnikov, K Nguyen, F Valeriani, B Venanzoni, G TI Contribution of the direct decay phi -> pi(+) pi(-) gamma to the process e(+)e(-) pi(+) pi(-) gamma at DA Phi NE SO PHYSICS LETTERS B LA English DT Article ID SCALAR MESONS; PHI->PI+PI-GAMMA; FACTORIES AB The potential of DA Phi NE to explore direct radiative decay Phi --> pi(+)pi(-)gamma is studied in detail. Predictions of different theoretical models for this decay are compared. We find that it should be possible to discriminate between these models at DA Phi NE in one year, even assuming a relatively low luminosity L=10(31)cm(-2)s(-1). The influence of the decay phi --> pi(+)pi(-)gamma on the measurement of total cross section sigma(e(+)e(-) --> hydrons) by tagging a photon in the reaction e(+)e(-) --> pi(+)pi(-)gamma is also discussed. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Univ Rome, Dipartimento Fis, I-00146 Rome, Italy. Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy. Ist Nazl Fis Nucl, Sez Pisa, I-56010 S Piero A Grado, PI, Italy. Univ S Piero Grado, Dipartimento Fis, I-56010 S Piero A Grado, PI, Italy. Univ Karlsruhe, Inst Expt Kernphys, D-76021 Karlsruhe, Germany. RP Melnikov, K (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 11 TC 29 Z9 29 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 23 PY 2000 VL 477 IS 1-3 BP 114 EP 124 DI 10.1016/S0370-2693(00)00209-4 PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 299MU UT WOS:000086203000017 ER PT J AU Lipkin, HJ AF Lipkin, HJ TI Neutrino oscillations as two-slit experiments in momentum space SO PHYSICS LETTERS B LA English DT Article ID PHASE UNCERTAINTY; INTERFERENCE AB The passage of a neutrino from source to detector is described as a multipath experiment where knowing the path destroys coherence. The concept of partial coherence and partial dephasing is developed in a toy model for recent mesoscopic 'which-path' experiments and shown to require considering the beam and the detector as a correlated quantum system. The application to Bragg scattering by X-rays gives the Debye-Waller factor. Neutrino amplitudes with the same energy and different masses are shown to be detected coherently and can produce oscillations at a detector localized for long times in space. Amplitudes with different energies are incoherent. Quantum mechanics alone shows the existence of a neutrino mass difference, to be required to explain the observed Super-Kamiokande data. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Lipkin, HJ (reprint author), Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. NR 17 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 23 PY 2000 VL 477 IS 1-3 BP 195 EP 200 DI 10.1016/S0370-2693(00)00166-0 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 299MU UT WOS:000086203000028 ER PT J AU Everett, L Langacker, P Plumacher, M Wang, J AF Everett, L Langacker, P Plumacher, M Wang, J TI Alternative supersymmetric spectra SO PHYSICS LETTERS B LA English DT Article ID STANDARD MODEL; ANOMALOUS U(1); STRING MODELS; SYMMETRY-BREAKING; EXTRA U(1); CONSTRAINTS; MEDIATOR; BOSONS; TERMS AB We describe the features of supersymmetric spectra, alternative to and qualitatively different from that of most versions of the MSSM. The spectra are motivated by extensions of the MSSM with an extra U(1)' gauge symmetry, expected in many grand unified and superstring models, which provide a plausible solution to the mu problem, both for models with supergravity and for gauge-mediated supersymmetry breaking. Typically, many or all of the squarks are rather heavy (larger than one TeV), especially for the first two families, as are the sleptons in the supergravity models. However, there is a richer spectrum of Higgs particles, neutralinos, and (possibly) charginos. Concrete examples of such spectra are presented, and the phenomenological implications are briefly discussed. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA. Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. Fermi Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Everett, L (reprint author), Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA. NR 42 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 23 PY 2000 VL 477 IS 1-3 BP 233 EP 241 DI 10.1016/S0370-2693(00)00187-8 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 299MU UT WOS:000086203000033 ER PT J AU McGivern, WS Sorkhabi, O Rizvi, AH Suits, AG North, SW AF McGivern, WS Sorkhabi, O Rizvi, AH Suits, AG North, SW TI Photofragment translational spectroscopy with state-selective "universal detection": The ultraviolet photodissociation of CS2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ADVANCED LIGHT-SOURCE; JET-COOLED CS2; 193 NM; ABSORPTION SPECTRUM; VACUUM ULTRAVIOLET; CHEMICAL-DYNAMICS; TRANSITION; PHOTOIONIZATION; DISSOCIATION; RESOLUTION AB We have investigated the photodissociation of CS2 at 193 nm using the technique of photofragment translational spectroscopy. The utilization of vacuum ultraviolet synchrotron radiation for product photoionization has permitted a determination of the vibrationally resolved translational energy distribution for the CS+S(D-1) channel and the translational energy distribution for the CS+S(P-3) channel. A simulation of the coincident S(D-1) translational energy distribution is consistent with a CS vibrational distribution of 0.02:0.17:0.19:0.46:0.15 in nu = 0:1:2:3:4 and an average rotational energy of similar to 1-3 kcal/mol. We find that the S(P-3)/S(D-1) branching ratio is 3.0 +/- 0.2, in good agreement with previous reports. Both asymptotic channels exhibit similar velocity dependent anisotropy parameters that decrease with decreasing translational energy release. The results extend earlier reports and provide further insight into the dissociation dynamics at 193 nm. (C) 2000 American Institute of Physics. [S0021-9606(00)00311-1]. C1 Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP McGivern, WS (reprint author), Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. RI North, Simon/G-5054-2012 OI North, Simon/0000-0002-0795-796X NR 31 TC 23 Z9 24 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 22 PY 2000 VL 112 IS 12 BP 5301 EP 5307 DI 10.1063/1.481101 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 291XY UT WOS:000085766100010 ER PT J AU Zhan, CG Landry, DW Ornstein, RL AF Zhan, CG Landry, DW Ornstein, RL TI Reaction pathways and energy barriers for alkaline hydrolysis of carboxylic acid esters in water studied by a hybrid supermolecule-polarizable continuum approach SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID COCAINE CATALYTIC ANTIBODIES; TRANSITION-STATE ANALOG; REACTION FIELD-THEORY; GAS-PHASE; AQUEOUS-SOLUTION; CONCERTED MECHANISM; THEORETICAL-MODELS; CARBONYL-COMPOUNDS; BASIC SOLUTIONS; METHYL FORMATE AB Reaction pathways, solvent effects, and energy barriers have been determined for the base-catalyzed hydrolysis of two representative alkyl esters in aqueous solution, using a hybrid supermolecule-polarizable continuum approach. Four solvent water molecules were explicitly included in the supermolecular reaction coordinate calculations; the remaining solvent water was modeled as a polarizable dielectric continuum surrounding the supermolecular reaction system. Two competing reaction pathways were observed, sharing a common first step, i.e. the formation of the tetrahedral intermediate. One pathway involves a direct proton transfer in the second step, i.e. the decomposition of the tetrahedral intermediate. A second pathway involves a water-assisted proton transfer during the decomposition of the tetrahedral intermediate. The direct participation of the solvent water molecule in the proton-transfer process significantly drops the energy barrier for the decomposition of the tetrahedral intermediate. Thus, the energy barrier calculated for the decomposition of the tetrahedral intermediate through the water-assisted proton transfer becomes lower than the barrier for the formation of the tetrahedral intermediate, while that through the direct proton transfer is higher. The computations reveal the important effect of solvent hydrogen bonding on energy barriers; without explicit consideration of the hydrogen-bonding effects, the calculated energy barriers for the formation of the tetrahedral intermediate become similar to 4-5 kcal/mol smaller. The favorable pathway involving water-assisted proton transfer and the energy barriers calculated using the hybrid supermolecule-polarizable continuum approach, including both the hydrogen-bonding effects and the remaining bulk solvent effects, are consistent with available experimental results. The energy barriers calculated for the first step of the hydrolysis in aqueous solution are in excellent agreement with the reported experimental data for methyl acetate and methyl formate. C1 Columbia Univ Coll Phys & Surg, Dept Med, New York, NY 10032 USA. Battelle NW, Pacific NW Natl Lab, Environm Technol Div, Richland, WA 99352 USA. RP Columbia Univ Coll Phys & Surg, Dept Med, 630 W 168th St, New York, NY 10032 USA. NR 86 TC 92 Z9 98 U1 1 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 22 PY 2000 VL 122 IS 11 BP 2621 EP 2627 DI 10.1021/ja9937932 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA 296ZT UT WOS:000086057200027 ER PT J AU Utschig, LM Poluektov, O Tiede, DM Thurnauer, MC AF Utschig, LM Poluektov, O Tiede, DM Thurnauer, MC TI EPR investigation of Cu2+-substituted photosynthetic bacterial reaction centers: Evidence for histidine ligation at the surface metal site SO BIOCHEMISTRY LA English DT Article ID ELECTRON-SPIN-ECHO; RHODOBACTER-SPHAEROIDES R-26; INDUCED STRUCTURAL-CHANGES; COPPER-BINDING SITE; PARAMAGNETIC RESONANCE; RHODOPSEUDOMONAS-SPHAEROIDES; PHOTOSYSTEM-II; PULSED EPR; ENVELOPE MODULATION; TYPE-2 COPPER AB The coordination environments of two distinct metal sites on the bacterial photosynthetic reaction center (RC) protein were probed with pulsed electron paramagnetic resonance (EPR spectroscopy. For these studies, Cu2+ was bound specifically to a surface site on native Fe2+-containing RCs from Rhodobacter sphaeroides R-26 and to the native non-heme Fe site in biochemically Fe-removed RCs, The cw and pulsed EPR results clearly indicate two spectroscopically different Cu2+ environments. In the dark, the RCs with Cu2+ bound to the surface site exhibit an axially symmetric EPR spectrum with g(parallel to) = 2.24, A(parallel to) = 160 G, g(perpendicular to) = 2.06, whereas the values g(parallel to) = 2.31, A(parallel to) = 143 G, and g(perpendicular to) = 2.07 were observed when Cu2+ was substituted in the Fe site. Examination of the light-induced spectral changes indicate that the surface Cu2+ is at least 23 iq removed from the primary donor (P+) and reduced quinone acceptor (Q(A)(-)) Electron spin-echo envelope modulation (ESEEM) spectra of these Cu-RC proteins have been obtained and provide the first direct solution structural information about the ligands in the surface metal site. From these pulsed EPR experiments, modulations were observed that are consistent with multiple weakly hyperfine coupled N-14 nuclei in close proximity to Cu2+, indicating that two or more histidines ligate the Cu2+ at the surface site, Thus, metal and EPR analyses confirm that we have developed reliable methods for stoichiometrically and specifically binding Cu2+ to a surface site that is distinct from the well characterized Fe site and support the view that Cu2+ is bound at or near the Zn site that modulates electron transfer between the quinones QA and QB (Q(A)(-)Q(B) --> Q(A)Q(B)(-)) (Utschig, L. M., Ohigashi, Y., Thurnauer, M. C., and Tiede, D. M (1998) Biochemistry 37, 8278-8281) and proton uptake by Q(B)(-) (Paddock, M. L., Graige, M. S., Feher, G., and Okamura, hi. Y. (1999) Proc. Natl. Acad. Sci. U.S.A, 96, 6183-6188). Detailed EPR spectroscopic characterization of these Cu2+-RCs will provide a means to investigate the role of local protein environments in modulating electron and proton transfer. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Utschig, LM (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave,D-200, Argonne, IL 60439 USA. NR 58 TC 23 Z9 24 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAR 21 PY 2000 VL 39 IS 11 BP 2961 EP 2969 DI 10.1021/bi991800t PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 296KL UT WOS:000086023500016 PM 10715116 ER PT J AU Porcar, L Marignan, J Ligoure, C Gulik-Krzywicki, T AF Porcar, L Marignan, J Ligoure, C Gulik-Krzywicki, T TI Effect of a nonadsorbing polymer on the stability of a two-solvent lamellar phase: Experimental and theoretical study of critical points of lamellar/lamellar phase separations SO LANGMUIR LA English DT Article ID X-RAY-SCATTERING; LYOTROPIC SMECTICS; SURFACTANT BILAYERS; SWOLLEN SURFACTANT; NONIONIC BILAYERS; AQUEOUS-SOLUTIONS; ELASTICITY; SYSTEMS; WATER; CURVATURE AB We investigate how the elastic properties of a two-solvent lyotropic lamellar phase are modified by the addition of a nonadsorbing water-soluble homopolymer (polyvynilpyrolidone). The initial two-solvent lyotropic lamellar phase consists of a regular stack of surfactant monolayers made from a mixture of nonionic surfactants (TX100/TX35) and a cationic surfactant (cetylpyridinium chloride) which separate successive layers of oil (decane) or water. By modifying the relative proportions of the various components of the lamellar phase or the temperature, we are able to control the magnitudes of the different contributions to physical interactions between the bilayers. From small-angle X-ray measurements on this system, we have identified four different critical L-alpha/L-alpha phase separations. At such critical points the corresponding smectic susceptibility (B) over bar(-1) diverges. In an attempt to better understand these experimental results we present a general calculation of the smectic compression modulus (B) over bar of a four-component lyotropic lamellar phase. This model is applied to our specific system. This allows us to understand the occurrence of three of the observed critical points of our system. C1 Univ Montpellier 2, Dynam Phases Condensees Grp, UMR CNRS 5581, F-34095 Montpellier 5, France. CNRS, Ctr Genet Mol, F-91198 Gif Sur Yvette, France. RP Porcar, L (reprint author), Oak Ridge Natl Lab, Div Solid State, Neutron Scattering Grp, Bldg 7962,Mail Stop 6393, Oak Ridge, TN 37831 USA. NR 48 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAR 21 PY 2000 VL 16 IS 6 BP 2581 EP 2594 DI 10.1021/la991193a PG 14 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 295TT UT WOS:000085984500026 ER PT J AU Chenthamarakshan, CR Rajeshwar, K AF Chenthamarakshan, CR Rajeshwar, K TI Heterogeneous photocatalytic reduction of Cr(VI) in UV-irradiated titania suspensions: Effect of protons, ammonium ions, and other interfacial aspects SO LANGMUIR LA English DT Article ID ORGANIC-COMPOUNDS; TIO2; POWDERS; OXIDATION; DIOXIDE; METALS; MEDIA AB Heterogeneous photocatalytic reactions in UV-irradiated TiO2 suspensions are comprised of two conjugate reaction pathways involving the photogenerated electrons and holes, respectively. The role of the hole reaction pathway in the dynamics of the photocatalytic reduction of Cr(VI) is a major focus of this study. It is shown that proton supply plays a crucial role in this reduction reaction. Thus, the Cr(VI) photoreduction kinetics switch from first order to zero order as the proton concentration is systematically increased in the aqueous suspensions. Ammonium ions are also shown to exert a dramatic accelerating influence on Cr(VI) reduction in media of initial pH 6. This new observation is rationalized by considering that these species act as hole scavengers. The consequent improvement in quantum yield combines with the facile proton generation upon NH4+ photooxidation, to result in the observed rate enhancement. Other interfacial aspects (i.e., adsorption) are also discussed. C1 Univ Texas, Dept Chem & Biochem, Arlington, TX 76019 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Rajeshwar, K (reprint author), Univ Texas, Dept Chem & Biochem, Arlington, TX 76019 USA. NR 25 TC 109 Z9 119 U1 2 U2 18 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAR 21 PY 2000 VL 16 IS 6 BP 2715 EP 2721 DI 10.1021/la9911483 PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 295TT UT WOS:000085984500043 ER PT J AU Zhang, HL Pradhan, AK AF Zhang, HL Pradhan, AK TI Photoionization and recombination of Fe XIX SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE atomic data; atomic processes; X-rays : general ID CLOSE-COUPLING APPROXIMATION; ELECTRON-ION RECOMBINATION; GENERAL PROGRAM; ATOMIC DATA; MATRIX; PHOTORECOMBINATION; RESONANCES; SPECTRA AB Photoionization cross-sections and recombination rate coefficients are presented for the L-shell ground-state fine-structure levels 2s(2)2p(4) P-3(2,0,1) of Fe (XIX). Several sets of calculations including relativist:ic effects are carried out: (i) Breit-Pauli R-matrix (BPRM), (ii) relativistic distorted-wave (RDW), and (iii) a semirelativistic calculation. Non-relativistic LS-coupling calculations are also performed for comparison. The BPRM calculations employ a configuration-interaction target representation for Fe xx consisting of 12 LS terms (23 fine-structure levels), as in the recently reported BPRM calculations by Donnelly et al. The background cross-sections in all three sets of present calculations agree with one another, but differ considerably from those of Donnelly et al. Owing to much more extensive resonance structures in the present]BPRM calculations, the sum of the corresponding recombination rate coefficients for the P-3(2,0,1) levels is up to 50 per cent higher than the LS rates at low temperatures but comparable for higher temperatures; this is in contrast to the results of Donnelly et al. who obtained the LS rates to be higher than their BPRM results by about a factor of 2. Reasons for these discrepancies are discussed. C1 Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA. Ohio State Univ, Dept Astron, Columbus, OH 43210 USA. US Dept Energy, Washington, DC USA. RP Zhang, HL (reprint author), Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA. NR 30 TC 7 Z9 7 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD MAR 21 PY 2000 VL 313 IS 1 BP 13 EP 20 DI 10.1046/j.1365-8711.2000.03173.x PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 300UV UT WOS:000086272200007 ER PT J AU Adams, D Adeva, B Akdogan, T Arik, E Arvidson, A Badelek, B Bardin, G Baum, G Berglund, P Betev, L Birsa, R Bjorkholm, P Bonner, BE de Botton, N Boutemeur, M Bradamante, F Bravar, A Bressan, A Bultmann, S Burtin, E Cavata, C Clocchiatti, M Crabb, D Cranshaw, J Cuhadar, T Dalla Torre, S van Dantzig, R Derro, B Deshpande, A Dhawan, S Dulya, C Dyring, A Eichblatt, S Faivre, JC Fasching, D Feinstein, F Fernandez, C Forthmann, S Frois, B Gallas, A Garzon, JA Gatignon, L Gaussiran, T Gilly, H Giorgi, M von Goeler, E Goertz, S Golutvin, IA Gracia, G de Groot, N Perdekamp, MG Haft, K von Harrach, D Hasegawa, T Hautle, P Hayashi, N Heusch, CA Horikawa, N Hughes, VW Igo, G Ishimoto, S Iwata, T Kabuss, EM Kageya, T Karev, A Kessler, HJ Ketel, TJ Kiryluk, J Kiryushin, I Kishi, A Kisselev, Y Klostermann, L Kramer, D Krivokhijine, V Kroger, W Kukhtin, V Kurek, K Kyynarainen, J Lamanna, M Landgraf, U Le Goff, JM Lehar, F de Lesquen, A Lichtenstadt, J Lindqvist, T Litmaath, M Lowe, M Magnon, A Mallot, GK Marie, F Martin, A Martino, J Matsuda, T Mayes, B McCarthy, JS Medved, K Meyer, W van Middelkoop, G Miller, D Miyachi, Y Mori, K Moromisato, J Nagaitsev, A Nassalski, J Naumann, L Niinikoski, TO Oberski, JEJ Ogawa, A Ozben, C Pereira, H Perrot-Kunne, F Peshekhonov, D Piegaia, R Pinsky, L Platchkov, S Plo, M Pose, D Postma, H Pretz, J Pussieux, T Radel, G Rijllart, A Reicherz, G Roberts, JB Rock, S Rodriguez, M Rondio, E Ropelewski, L Sabo, I Saborido, J Sandacz, A Savin, I Schiavon, P Schiller, A Schuler, KP Seitz, R Semertzidis, Y Sergeev, S Shanahan, P Sichtermann, EP Simeoni, F Smirnov, GI Staude, A Steinmetz, A Stiegler, U Stuhrmann, H Szleper, M Tessarotto, F Thers, D Tlaczala, W Tripet, A Unel, G Velasco, M Vogt, J Voss, R Whitten, C Windmolders, R Willumeit, R Wislicki, W Witzmann, A Ylostalo, J Zanetti, AM Zaremba, K Zamiatin, NI Zhao, J AF Adams, D Adeva, B Akdogan, T Arik, E Arvidson, A Badelek, B Bardin, G Baum, G Berglund, P Betev, L Birsa, R Bjorkholm, P Bonner, BE de Botton, N Boutemeur, M Bradamante, F Bravar, A Bressan, A Bultmann, S Burtin, E Cavata, C Clocchiatti, M Crabb, D Cranshaw, J Cuhadar, T Dalla Torre, S van Dantzig, R Derro, B Deshpande, A Dhawan, S Dulya, C Dyring, A Eichblatt, S Faivre, JC Fasching, D Feinstein, F Fernandez, C Forthmann, S Frois, B Gallas, A Garzon, JA Gatignon, L Gaussiran, T Gilly, H Giorgi, M von Goeler, E Goertz, S Golutvin, IA Gracia, G de Groot, N Perdekamp, MG Haft, K von Harrach, D Hasegawa, T Hautle, P Hayashi, N Heusch, CA Horikawa, N Hughes, VW Igo, G Ishimoto, S Iwata, T Kabuss, EM Kageya, T Karev, A Kessler, HJ Ketel, TJ Kiryluk, J Kiryushin, I Kishi, A Kisselev, Y Klostermann, L Kramer, D Krivokhijine, V Kroger, W Kukhtin, V Kurek, K Kyynarainen, J Lamanna, M Landgraf, U Le Goff, JM Lehar, F de Lesquen, A Lichtenstadt, J Lindqvist, T Litmaath, M Lowe, M Magnon, A Mallot, GK Marie, F Martin, A Martino, J Matsuda, T Mayes, B McCarthy, JS Medved, K Meyer, W van Middelkoop, G Miller, D Miyachi, Y Mori, K Moromisato, J Nagaitsev, A Nassalski, J Naumann, L Niinikoski, TO Oberski, JEJ Ogawa, A Ozben, C Pereira, H Perrot-Kunne, F Peshekhonov, D Piegaia, R Pinsky, L Platchkov, S Plo, M Pose, D Postma, H Pretz, J Pussieux, T Radel, G Rijllart, A Reicherz, G Roberts, JB Rock, S Rodriguez, M Rondio, E Ropelewski, L Sabo, I Saborido, J Sandacz, A Savin, I Schiavon, P Schiller, A Schuler, KP Seitz, R Semertzidis, Y Sergeev, S Shanahan, P Sichtermann, EP Simeoni, F Smirnov, GI Staude, A Steinmetz, A Stiegler, U Stuhrmann, H Szleper, M Tessarotto, F Thers, D Tlaczala, W Tripet, A Unel, G Velasco, M Vogt, J Voss, R Whitten, C Windmolders, R Willumeit, R Wislicki, W Witzmann, A Ylostalo, J Zanetti, AM Zaremba, K Zamiatin, NI Zhao, J TI Measurement of the SMC muon beam polarisation using the asymmetry in the elastic scattering off polarised electrons SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE muon beam; polarisation measurement; polarised muon; polarised electron; polarised scattering; magnetised target ID STRUCTURE-FUNCTION G(1)(X); MOLLER POLARIMETER; POLARIZATION; PROTON; DEUTERON AB A muon beam polarimeter was built for the SMC experiment at the CERN SPS, for beam energies of 100 and 190 GeV. The beam polarisation is determined from the asymmetry in the elastic scattering off the polarised electrons of a ferromagnetic target whose magnetisation is periodically reversed. At muon energies of 100 and 190 GeV the measured polarisation is P-mu = -0.80 +/- 0.03 (stat.) +/- 0.02 (syst.) and P-mu = - 0.797 +/- 0.011 (stat.) +/- 0.012 (syst.), respectively. These results agree with measurements of the beam polarisation using a shape analysis of the decay positron energy spectrum. (C) 2000 Elsevier Science B.V. All rights reserved. C1 CEA Saclay, DAPNIA, F-91191 Gif Sur Yvette, France. Rice Univ, Bonner Lab, Houston, TX 77251 USA. Univ Santiago, Dept Particle Phys, Santiago De Compostela 15706, Spain. Bogazici Univ, Istanbul, Turkey. Istanbul Tech Univ, TR-80626 Istanbul, Turkey. Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, Sweden. Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland. Warsaw Univ, PL-00681 Warsaw, Poland. Univ Bielefeld, Dept Phys, D-33501 Bielefeld, Germany. Helsinki Univ Technol, Low Temp Lab, Espoo, Finland. Helsinki Univ Technol, Inst Particle Phys, Espoo, Finland. Univ Munich, Dept Phys, D-80799 Munich, Germany. Ist Nazl Fis Nucl, I-34127 Trieste, Italy. Univ Trieste, Dept Phys, I-34127 Trieste, Italy. Yale Univ, Dept Phys, New Haven, CT 06511 USA. Univ Mainz, Inst Nucl Phys, D-55099 Mainz, Germany. Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA. Delft Univ Technol, NL-1009 AJ Amsterdam, Netherlands. NIKHEF, NL-1009 AJ Amsterdam, Netherlands. FOM, NL-1009 AJ Amsterdam, Netherlands. Free Univ Amsterdam, NL-1009 AJ Amsterdam, Netherlands. Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90024 USA. Northwestern Univ, Dept Phys, Evanston, IL 60208 USA. Univ Houston, Dept Phys, Houston, TX 77204 USA. Univ Houston, Inst Beam Particle Dynam, Houston, TX 77204 USA. GKSS, D-21494 Geesthacht, Germany. CERN, CH-1211 Geneva 23, Switzerland. Univ Freiburg, Dept Phys, D-79104 Freiburg, Germany. Ruhr Univ Bochum, Dept Phys, D-44780 Bochum, Germany. Joint Inst Nucl Res Dubna, RU-141980 Dubna, Russia. Nagoya Univ, CIRSE, Chikusa Ku, Nagoya, Aichi 464, Japan. Nagoya Univ, Dept Phys, Chikusa Ku, Nagoya, Aichi 464, Japan. Tel Aviv Univ, Sch Phys, IL-69978 Tel Aviv, Israel. Univ Mons, Fac Sci, B-7000 Mons, Belgium. Northeastern Univ, Dept Phys, Boston, MA 02115 USA. Miyazaki Univ, Fac Engn, Miyazaki 88921, Japan. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. RIKEN, Inst Phys & Chem Res, Wako, Saitama 35101, Japan. Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA. Kek Nat Lab High Energy Phys, Tsukuba, Ibaraki 305, Japan. Univ Buenos Aires, Dept Phys, RA-1428 Buenos Aires, DF, Argentina. American Univ, Washington, DC 20016 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Warsaw Univ Technol, Warsaw, Poland. RP de Botton, N (reprint author), CEA Saclay, DAPNIA, F-91191 Gif Sur Yvette, France. RI de Groot, Nicolo/A-2675-2009; Hautle, Patrick/C-1044-2012; Zanetti, Anna/I-3893-2012; Martin, Anna/I-9381-2012; Zhao, Jinkui/B-7872-2013; Le Goff, Jean-Marc/E-7629-2013; Semertzidis, Yannis K./N-1002-2013; Gallas Torreira, Abraham Antonio/K-6508-2014; Plo Casasus, Maximo/M-1445-2014; Adeva, Bernardo /L-1378-2014; Saborido Silva, Juan Jose/K-1775-2014; CAVATA, Christian/P-6496-2015 OI Gaussiran, Thomas/0000-0002-5442-7507; Hautle, Patrick/0000-0002-0502-8278; Martin, Anna/0000-0002-1333-0143; Zhao, Jinkui/0000-0002-7756-1952; Gallas Torreira, Abraham Antonio/0000-0002-2745-7954; Plo Casasus, Maximo/0000-0002-2289-918X; Adeva, Bernardo /0000-0001-9756-3712; Saborido Silva, Juan Jose/0000-0002-6270-130X; NR 28 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 21 PY 2000 VL 443 IS 1 BP 1 EP 19 DI 10.1016/S0168-9002(99)01017-7 PG 19 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 300UF UT WOS:000086270600001 ER PT J AU Alburger, DE May, M AF Alburger, DE May, M TI Diamond targets for hyperon interaction studies SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE diamond targets; CVD diamond; construction AB When studying the interaction of short-lived particles with nuclei, a target of the highest possible density is advantageous. Very large diamond targets were prepared to investigate the interaction of Xi particles with carbon nuclei. The high density of diamond significantly increases the probability that the Xi will interact before it decays. The present target construction depended on the availability of commercially produced 1-cm square diamond wafers which could be assembled into 1-cm cubes. Targets of 40 cm(3) for Brookhaven AGS experiment E885 and 16 cm(3) for an experiment at the KEK Laboratory, Japan, were made. Analysis of the E885 data confirmed the higher yield with diamond over lower-density carbon targets. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Alburger, DE (reprint author), Brookhaven Natl Lab, Dept Phys, POB 5000, Upton, NY 11973 USA. NR 1 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 21 PY 2000 VL 443 IS 1 BP 27 EP 30 DI 10.1016/S0168-9002(99)01004-9 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 300UF UT WOS:000086270600003 ER PT J AU Cronin-Hennessy, D Beretvas, A Derwent, PF AF Cronin-Hennessy, D Beretvas, A Derwent, PF TI Luminosity monitoring and measurement at CDF SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ELASTIC-SCATTERING; PBARP COLLISIONS; ROOT-S=1.8 TEV; CROSS-SECTION; SYSTEM AB Using two telescopes of beam-beam counters, CDF (Collider Detector at Fermilab) has measured the luminosity to an accuracy of 4.1% (3.6%) in run Ib (Ia), For run Ib (Ia) the average luminosity was 9.1(3.3) x 10(30) cm(-2) s(-1). For a typical data set the integrated luminosity was 86.47 (19.65) pb(-1) in run Ib (Ia) resulting in a total integrated luminosity of 106.1 +/- 4.1 pb(-1). This paper shows how we have determined the accuracy of our results. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Duke Univ, Durham, NC 27708 USA. RP Beretvas, A (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 19 TC 23 Z9 23 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 MAR 21 PY 2000 VL 443 IS 1 BP 37 EP 50 DI 10.1016/S0168-9002(99)01172-9 PG 14 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 300UF UT WOS:000086270600005 ER PT J AU Amaral, P Amorim, A Anderson, K Barreira, G Benetta, R Berglund, S Biscarat, C Blanchot, G Blucher, E Bogush, A Bohm, C Boldea, V Borisov, O Bosman, M Bromberg, C Budagov, J Burdin, S Caloba, L Carvalho, J Casado, P Castillo, MV Cavalli-Sforza, M Cavasinni, V Chadelas, R Chirikov-Zorin, I Chlachidze, G Cobal, M Cogswell, F Colaco, F Cologna, S Constantinescu, S Costanzo, D Crouau, M Daudon, F Colaco, F Cologna, S Constantinescu, S Costanzo, D Crouau, M Daudon, F David, J David, M Davidek, T Dawson, J De, K Del Prete, T De Santo, A Di Girolamo, B Dita, S Dolejsi, J Dolezal, Z Downing, R Efthymiopoulos, I Engstrom, M Errede, D Errede, S Evans, H Fenyuk, A Ferrer, A Flaminio, V Gallas, E Gaspar, M Gil, I Gildemeister, O Glagolev, V Gomes, A Gonzalez, V De la Hoz, SG Grabski, V Grauges, E Grenier, P Hakopian, H Haney, M Hansen, M Hellman, S Henriques, A Hebrard, C Higon, E Holmgren, S Huston, J Ivanyushenkov, Y Jon-And, K Juste, A Kakurin, S Karapetian, G Karyukhin, A Kopikov, S Kukhtin, V Kulchitsky, Y Kurzbauer, W Kuzmin, M Lami, S Lapin, V Lazzeroni, C Lebedev, A Leitner, R Li, J Lomakin, Y Lomakina, O Lokajicek, M Amengual, JML Maio, A Malyukov, S Marroquin, F Martins, JP Mazzoni, E Merritt, F Miller, R Minashvili, I Miralles, L Montarou, G Munar, A Nemecek, S Nessi, M Onofre, A Orteu, S Park, IC Pallin, D Pantea, D Paoletti, R Patriarca, J Pereira, A Perlas, JA Petit, P Pilcher, J Pinhao, J Poggioli, L Price, L Proudfoot, J Pukhov, O Reinmuth, G Renzoni, G Richards, R Roda, C Romance, JB Romanov, V Ronceux, B Rosnet, P Rumyantsev, V Russakovich, N Sanchis, E Sanders, H Santoni, C Santos, J Sawyer, L Says, LP Seixas, JM Sellden, B Semenov, A Shchelchkov, A Shochet, M Simaitis, V Sissakian, A Solodkov, A Solovianov, O Sonderegger, P Sosebee, M Soustruznik, K Spano, F Stanek, R Starchenko, E Stephens, R Suk, M Tang, F Tas, P Thaler, J Tokar, S Topilin, N Trka, Z Turcot, A Turcotte, M Valkar, S Varandas, MJ Vartapetian, A Vazeille, F Vichou, I Vinogradov, V Vorozhtsov, S Wagner, D White, A Wolters, H Yamdagni, N Yarygin, G Yosef, C Zaitsev, A Zdrazil, M Zuniga, J AF Amaral, P Amorim, A Anderson, K Barreira, G Benetta, R Berglund, S Biscarat, C Blanchot, G Blucher, E Bogush, A Bohm, C Boldea, V Borisov, O Bosman, M Bromberg, C Budagov, J Burdin, S Caloba, L Carvalho, J Casado, P Castillo, MV Cavalli-Sforza, M Cavasinni, V Chadelas, R Chirikov-Zorin, I Chlachidze, G Cobal, M Cogswell, F Colaco, F Cologna, S Constantinescu, S Costanzo, D Crouau, M Daudon, F Colaco, F Cologna, S Constantinescu, S Costanzo, D Crouau, M Daudon, F David, J David, M Davidek, T Dawson, J De, K Del Prete, T De Santo, A Di Girolamo, B Dita, S Dolejsi, J Dolezal, Z Downing, R Efthymiopoulos, I Engstrom, M Errede, D Errede, S Evans, H Fenyuk, A Ferrer, A Flaminio, V Gallas, E Gaspar, M Gil, I Gildemeister, O Glagolev, V Gomes, A Gonzalez, V De la Hoz, SG Grabski, V Grauges, E Grenier, P Hakopian, H Haney, M Hansen, M Hellman, S Henriques, A Hebrard, C Higon, E Holmgren, S Huston, J Ivanyushenkov, Y Jon-And, K Juste, A Kakurin, S Karapetian, G Karyukhin, A Kopikov, S Kukhtin, V Kulchitsky, Y Kurzbauer, W Kuzmin, M Lami, S Lapin, V Lazzeroni, C Lebedev, A Leitner, R Li, J Lomakin, Y Lomakina, O Lokajicek, M Amengual, JML Maio, A Malyukov, S Marroquin, F Martins, JP Mazzoni, E Merritt, F Miller, R Minashvili, I Miralles, L Montarou, G Munar, A Nemecek, S Nessi, M Onofre, A Orteu, S Park, IC Pallin, D Pantea, D Paoletti, R Patriarca, J Pereira, A Perlas, JA Petit, P Pilcher, J Pinhao, J Poggioli, L Price, L Proudfoot, J Pukhov, O Reinmuth, G Renzoni, G Richards, R Roda, C Romance, JB Romanov, V Ronceux, B Rosnet, P Rumyantsev, V Russakovich, N Sanchis, E Sanders, H Santoni, C Santos, J Sawyer, L Says, LP Seixas, JM Sellden, B Semenov, A Shchelchkov, A Shochet, M Simaitis, V Sissakian, A Solodkov, A Solovianov, O Sonderegger, P Sosebee, M Soustruznik, K Spano, F Stanek, R Starchenko, E Stephens, R Suk, M Tang, F Tas, P Thaler, J Tokar, S Topilin, N Trka, Z Turcot, A Turcotte, M Valkar, S Varandas, MJ Vartapetian, A Vazeille, F Vichou, I Vinogradov, V Vorozhtsov, S Wagner, D White, A Wolters, H Yamdagni, N Yarygin, G Yosef, C Zaitsev, A Zdrazil, M Zuniga, J TI Hadronic shower development in Iron-Scintillator Tile Calorimetry SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE calorimetry; computer data analysis ID PROFILES AB The lateral and longitudinal profiles of hadronic showers detected by a prototype of the ATLAS Iron-Scintillator Tile Hadron Calorimeter have been investigated. This calorimeter presents a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100 GeV. a detailed picture of transverse shower behaviour is obtained. The underlying radial energy densities for the four depth segments and for the entire calorimeter have been reconstructed. A three-dimensional hadronic shower parametrisation has been developed. The results presented here are useful for understanding the performance of iron-scintillator calorimeters, for developing fast simulations of hadronic showers, for many calorimetry problems requiring the integration of a shower energy deposition in a volume and for future calorimeters design. (C) 2000 Elsevier Science B.V. All rights reserved. C1 CERN, Geneva, Switzerland. LIP, P-1000 Lisbon, Portugal. Univ Lisbon, FCUL, P-1699 Lisbon, Portugal. Univ Chicago, Chicago, IL 60637 USA. Stockholm Univ, S-10691 Stockholm, Sweden. Univ Clermont Ferrand, LPC Clermont Ferrand, CNRS, IN2P3, Clermont Ferrand, France. Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain. Natl Acad Sci, Inst Phys, Minsk, Byelarus. Natl Inst Phys & Nucl Engn, Bucharest, Romania. Joint Inst Nucl Res Dubna, Dubna, Russia. Michigan State Univ, E Lansing, MI 48824 USA. Univ Pisa, Pisa, Italy. Ist Nazl Fis Nucl, Pisa, Italy. UFRJ, EE, COPPE, Rio De Janeiro, Brazil. Univ Coimbra, LIP, P-3000 Coimbra, Portugal. Univ Coimbra, FCTUC, P-3000 Coimbra, Portugal. Univ Illinois, Urbana, IL 61801 USA. Inst High Energy Phys, Protvino, Russia. Charles Univ, Prague, Czech Republic. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Texas, Arlington, TX 76019 USA. Univ Valencia, CSIC, Ctr Mixto, IFIC, E-46100 Valencia, Spain. Yerevan Phys Inst, Yerevan 375036, Armenia. Acad Sci Czech Republ, Prague, Czech Republic. Comenius Univ, Bratislava, Slovakia. RP Nessi, M (reprint author), CERN, Geneva, Switzerland. RI Solodkov, Alexander/B-8623-2017; Zaitsev, Alexandre/B-8989-2017; Karyukhin, Andrey/J-3904-2014; Gil Botella, Ines/H-8991-2015; Zuniga, Juan/P-4385-2014; Ferrer, Antonio/H-2942-2015; Carvalho, Joao/M-4060-2013; Gonzalez de la Hoz, Santiago/E-2494-2016; Gonzalez Millan, Vicente/J-3023-2012; SANCHIS, ENRIQUE/J-7348-2016; David, Mario/C-4664-2012; Wolters, Helmut/M-4154-2013; De, Kaushik/N-1953-2013; Nemecek, Stanislav/G-5931-2014; Bosman, Martine/J-9917-2014; Cavalli-Sforza, Matteo/H-7102-2015 OI Solodkov, Alexander/0000-0002-2737-8674; Zaitsev, Alexandre/0000-0002-4961-8368; Gomes, Agostinho/0000-0002-5940-9893; Barreira, Gaspar/0000-0001-6373-9441; Karyukhin, Andrey/0000-0001-9087-4315; Maio, Amelia/0000-0001-9099-0009; Amorim, Antonio/0000-0003-0638-2321; Zuniga, Juan/0000-0002-1041-6451; Ferrer, Antonio/0000-0003-0532-711X; Carvalho, Joao/0000-0002-3015-7821; Gonzalez de la Hoz, Santiago/0000-0001-5304-5390; Gonzalez Millan, Vicente/0000-0001-6014-2586; SANCHIS, ENRIQUE/0000-0002-9689-9131; Wolters, Helmut/0000-0002-9588-1773; De, Kaushik/0000-0002-5647-4489; Bosman, Martine/0000-0002-7290-643X; NR 30 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 21 PY 2000 VL 443 IS 1 BP 51 EP 70 DI 10.1016/S0168-9002(99)01020-7 PG 20 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 300UF UT WOS:000086270600006 ER PT J AU Liu, CX Szecsody, JE Zachara, JM Ball, WP AF Liu, CX Szecsody, JE Zachara, JM Ball, WP TI Use of the generalized integral transform method for solving equations of solute transport in porous media SO ADVANCES IN WATER RESOURCES LA English DT Article ID DIFFUSION-PROBLEMS AB The generalized integral transform technique (GITT) is applied to solve the one-dimensional advection-dispersion equation (ADE) in heterogeneous porous media coupled with either linear or nonlinear sorption and decay. When both sorption and decay are linear, analytical solutions are obtained using the GITT for one-dimensional ADEs with spatially and temporally variable flow and dispersion coefficient and arbitrary initial and boundary conditions. When either sorption or decay is nonlinear the solutions to ADEs with the GITT are hybrid analytical-numerical. In both linear and nonlinear cases, the forward and inverse integral transforms for the problems described in the paper are apparent and straightforward. Some illustrative examples with linear sorption and decay are presented to demonstrate the application and check the accuracy of the derived analytical solutions. The derived hybrid analytical-numerical solutions are checked against a numerical approach and demonstratively applied to a nonlinear transport example, which simulates a simplified system of iron oxide bioreduction with nonlinear sorption and nonlinear reaction kinetics. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Johns Hopkins Univ, Dept Geog & Environm Engn, Baltimore, MD 21218 USA. RP Liu, CX (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. RI Liu, Chongxuan/C-5580-2009; Ball, William/A-3285-2010 OI Ball, William/0000-0001-5217-8108 NR 26 TC 25 Z9 25 U1 0 U2 8 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0309-1708 J9 ADV WATER RESOUR JI Adv. Water Resour. PD MAR 20 PY 2000 VL 23 IS 5 BP 483 EP 492 DI 10.1016/S0309-1708(99)00048-2 PG 10 WC Water Resources SC Water Resources GA 289RQ UT WOS:000085636100004 ER PT J AU Murray, JE Milam, D Boley, CD Estabrook, KG Caird, JA AF Murray, JE Milam, D Boley, CD Estabrook, KG Caird, JA TI Spatial filter pinhole development for the National Ignition Facility SO APPLIED OPTICS LA English DT Article AB We present results from a major experimental effort to understand the behavior of spatial filter pinholes and to identify and demonstrate a pinhole that will meet the requirements of the National Ignition Facility (NIF). We find that pinhole performance depends significantly on geometry and material. Cone pinholes are found to stay open longer and to cause less backreflection than pinholes of more conventional geometry. We show that a +/-150-mu rad stainless-steel cone pinhole will pass a full-energy NIF ignition pulse with required margins for misalignment and for smoothing by spectral dispersion. On the basis of a model fitted to experimental results, a +/-125-mu rad stainless-steel cone pinhole is also projected to meet these requirements. (C) 2000 Optical Society of America OCIS codes: 120.3180, 320.4240, 330.6110, 350.5400. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Murray, JE (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM murray4@llnl.gov NR 13 TC 26 Z9 34 U1 1 U2 9 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 MAR 20 PY 2000 VL 39 IS 9 BP 1405 EP 1420 DI 10.1364/AO.39.001405 PG 16 WC Optics SC Optics GA 295EM UT WOS:000085953800008 PM 18338025 ER PT J AU Powers, PE Kulp, TJ Kennedy, R AF Powers, PE Kulp, TJ Kennedy, R TI Demonstration of differential backscatter absorption gas imaging SO APPLIED OPTICS LA English DT Article ID TOPOGRAPHIC TARGETS; VISUALIZATION; SYSTEMS AB Backscatter absorption gas imaging (BAGI) is a technique that uses infrared active imaging to generate real-time video imagery of gas plumes. We describe a method that employs imaging at two wavelengths (absorbed and not absorbed by the gas to be detected) to allow wavelength-differential BAGI. From the frames collected at each wavelength, an absorbance image is created that displays the differential absorbance of the atmosphere between the imager and the backscatter surface. This is analogous to a two-dimensional topographic differential absorption lidar or differential optical absorption spectroscopy measurement. Gas plumes are displayed, but the topographic scene image is removed. This allows a more effective display of the plume image, thus ensuring detection under a nide variety of conditions. The instrument used to generate differential BAGI is described. Data generated by the instrument are presented and analyzed to estimate sensitivity. (C) 2000 Optical Society of America OCIS codes: 280.1120, 280.1910, 280.3420, 280.3640, 010.3640. C1 Sandia Natl Labs, Chem & Radiat Detect Lab, Livermore, CA 94551 USA. RP Powers, PE (reprint author), Univ Dayton, Dept Phys, Dayton, OH 45469 USA. EM tjkulp@sandia.gov NR 16 TC 18 Z9 19 U1 0 U2 2 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 MAR 20 PY 2000 VL 39 IS 9 BP 1440 EP 1448 DI 10.1364/AO.39.001440 PG 9 WC Optics SC Optics GA 295EM UT WOS:000085953800013 PM 18338030 ER PT J AU Savvate'ev, V Friedl, JH Zou, L Shinar, J Christensen, K Oldham, W Rothberg, LJ Chen-Esterlit, Z Kopelman, R AF Savvate'ev, V Friedl, JH Zou, L Shinar, J Christensen, K Oldham, W Rothberg, LJ Chen-Esterlit, Z Kopelman, R TI Nanosecond transients in the electroluminescence from multilayer blue organic light-emitting devices based on 4,4(')-bis(2,2(')diphenyl vinyl)-1,1(')-biphenyl SO APPLIED PHYSICS LETTERS LA English DT Article ID DIODES; CATHODE AB Nanosecond electroluminescence (EL) overshoots observed when multilayer blue 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl (DPVBi)-based organic light-emitting devices (OLEDs) are excited by rectangular voltage pulses are described. The overshoots occur at the voltage turn-off and exceed the cw brightness by up to an order of magnitude. Time-resolved images of the OLEDs demonstrate that the emission from most of the sample surface decays with a single time constant tau(1)=13 +/- 3 ns. This decay is attributed to recombination of charges which accumulate at the interface of the electron and hole transporting layers, possibly at intrinsic trapping sites. In areas of increased electron injection and EL, such as cathode edges and morphological defects, a second slower decay time 20 ns 0 remarkably well by those for scaled-solar mixes simply by requiring the total mass-fraction abundance of the heavy elements, Z, to be the same. However, this result holds only for metallicities significantly less than solar. Above [Fe/H] greater than or similar to -0.8, tracks and isochrones for enhanced alpha-element mixtures begin to have systematically hotter/bluer turnoffs and red giant branches than those for scaled-solar mixtures of the heavy elements. Also addressed is the extent to which our models satisfy the constraints posed by the local subdwarfs, the distances of which are based on Hipparcos parallax measurements. Our analysis suggests that the predicted metallicity dependence of the location of the lower main sequence on the C-M diagram is in good agreement with the observed dependence In fact, we do not find any compelling evidence from the local Population II calibrators that the colors of our models require significant adjustments. In further support of our calculations, we find that, both in zero point and slope, the computed giant branches on the (M-bol, log T-eff)-plane agree well with those inferred for globular clusters from observations in the infrared. Moreover, our ZAHB models have luminosities that are just outside the 1 sigma error bars of the mean M-V's inferred for RR Lyrae stars from Baade-Wesselink, statistical parallax, and trigonometric parallax studies. Lower helium contents or higher alpha-element abundances or an increase in the conductive opacities are among the possible ways of reducing the differences that remain. To facilitate comparisons with observations, the tracks/ZAHBs are provided with predicted BV(RI)(C) photometry. C1 Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 3P6, Canada. Los Alamos Natl Lab, XTA, Los Alamos, NM 87545 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Wichita State Univ, Dept Phys, Wichita, KS 67260 USA. RP Univ Victoria, Dept Phys & Astron, POB 3055, Victoria, BC V8W 3P6, Canada. EM davb@uvvm.uvic.ca; fswenson@lanl.gov; rogers4@llnl.gov; iglesias1@llnl.gov; dra@twsuvm.uc.twsu.edu NR 114 TC 272 Z9 275 U1 0 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 2000 VL 532 IS 1 BP 430 EP 452 DI 10.1086/308544 PN 1 PG 23 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 301VF UT WOS:000086330400039 ER PT J AU Geer, SH Kennedy, DC AF Geer, SH Kennedy, DC TI A new limit on the antiproton lifetime SO ASTROPHYSICAL JOURNAL LA English DT Article DE cosmic rays; elementary particles; solar wind ID COSMIC-RAY ANTIPROTONS; GALACTIC DIFFUSION; PARTICLE DRIFT; SOLAR MINIMUM; CURRENT SHEET; TRANSPORT; MODULATION; ACCUMULATOR; ULYSSES; MODELS AB Measurements of the cosmic-ray;(p) over bar/p ratio are compared with predictions from an inhomogeneous disk-diffusion model of (p) over bar production and propagation within the Galaxy, combined with a calculation of the modulation of the interstellar cosmic-ray spectra as the particles propagate through the heliosphere to the Earth. The predictions agree with the observed (p) over bar/p spectrum. Adding a finite p lifetime to the model, we obtain the limit tau((p) over bar) > 0.8 Myr (90% CL). C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 32611 USA. RP Geer, SH (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 38 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 2000 VL 532 IS 1 BP 648 EP 652 DI 10.1086/308552 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 301VF UT WOS:000086330400056 ER PT J AU Akerlof, C Balsano, R Barthelmy, S Bloch, J Butterworth, P Casperson, D Cline, T Fletcher, S Frontera, F Gisler, G Heise, J Hills, J Hurley, K Kehoe, R Lee, B Marshall, S McKay, T Pawl, A Piro, L Szymanski, J Wren, J AF Akerlof, C Balsano, R Barthelmy, S Bloch, J Butterworth, P Casperson, D Cline, T Fletcher, S Frontera, F Gisler, G Heise, J Hills, J Hurley, K Kehoe, R Lee, B Marshall, S McKay, T Pawl, A Piro, L Szymanski, J Wren, J TI Prompt optical observations of gamma-ray bursts SO ASTROPHYSICAL JOURNAL LA English DT Article DE gamma rays : bursts; gamma rays : observations ID 28 FEBRUARY 1997; IDENTIFICATION AB The Robotic Optical Transient Search Experiment (ROTSE) seeks to measure simultaneous and early afterglow optical emission from gamma-ray bursts (GRBs). A search for optical counterparts to six GRBs with localization errors of 1 deg(2) or better produced no detections. The earliest limiting sensitivity is m(ROTSE) > 13.1 at 10.85 s (5 s exposure) after the gamma-ray rise, and the best limit is m(ROTSE) > 16.0 at 62 minutes (897 s exposure). These are the most stringent limits obtained for the GRB optical counterpart brightness in the first hour after the burst. Consideration of the gamma-ray fluence and peak flux for these bursts and for GRB 990123 indicates that there is not a strong positive correlation between optical flux and gamma-ray emission. C1 Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. Univ Ferrara, I-44100 Ferrara, Italy. Ruimteonderzoek, Space Res Org Netherlands, NL-3584 CA Utrecht, Netherlands. Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. CNR, Inst Astrofis Spaziale, Rome, Italy. RP Akerlof, C (reprint author), Univ Michigan, Dept Astron, 830 Dennison,501 E Univ Ave, Ann Arbor, MI 48109 USA. RI Barthelmy, Scott/D-2943-2012; McKay, Timothy/C-1501-2009; PIRO, LUIGI/E-4954-2013 OI McKay, Timothy/0000-0001-9036-6150; PIRO, LUIGI/0000-0003-4159-3984 NR 24 TC 36 Z9 36 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 2000 VL 532 IS 1 BP L25 EP L28 DI 10.1086/312567 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 301VH UT WOS:000086330600007 ER PT J AU Blasi, P AF Blasi, P TI Stochastic acceleration and nonthermal radiation in clusters of galaxies SO ASTROPHYSICAL JOURNAL LA English DT Article DE acceleration of particles; galaxies : dusters : general; X-rays : galaxies ID COMA CLUSTER; MAGNETIC-FIELD; EMISSION AB We calculate the distribution of electrons in clusters of galaxies, which results from thermalization processes in the presence of stochastic acceleration due to plasma waves. We show that the electron distribution can deviate from a Maxwell-Boltzmann distribution because of the effect of the stochastic energy gain, provided that waves can be sustained against damping. The bremsstrahlung emission of the nonthermal tail of electrons can result in a flux of hard X-rays that is compatible with the ones recently detected in some clusters of galaxies. C1 NASA, Fermilab Astrophys Grp, Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Blasi, P (reprint author), NASA, Fermilab Astrophys Grp, Fermi Natl Accelerator Lab, Box 500,500 Wilson Rd, Batavia, IL 60510 USA. RI Blasi, Pasquale/O-9345-2015 OI Blasi, Pasquale/0000-0003-2480-599X NR 18 TC 51 Z9 51 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 2000 VL 532 IS 1 BP L9 EP L12 DI 10.1086/312551 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 301VH UT WOS:000086330600003 ER PT J AU Runde, W Neu, MP Van Pelt, C Scott, BL AF Runde, W Neu, MP Van Pelt, C Scott, BL TI Single crystal and solution complex structure of Nd(CO3)(4)(5-). The first characterization of a mononuclear lanthanide(III) carbonate complex SO INORGANIC CHEMISTRY LA English DT Article ID ION AB Carbonate is generally a strongly complexing ligand for f-element ions, including trivalent lanthanides. The few lanthanide(III) carbonates previously characterized have extended multidimensional solid stare structures. Spectroscopic and solubility studies indicate that the solution species are monomeric; however, structural details remain unknown. We report the first single-crystal structure of a discrete mononuclear Nd(III) carbonate, the guanidinium salt of Nd(CO3)(4)(H2O)(5-), which corresponds directly to a species formed in highly concentrated carbonate solutions. C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RP Runde, W (reprint author), Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, LANL Mail Stop J514, Los Alamos, NM 87545 USA. RI Scott, Brian/D-8995-2017 OI Scott, Brian/0000-0003-0468-5396 NR 21 TC 27 Z9 27 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 2000 VL 39 IS 6 BP 1050 EP + DI 10.1021/ic991087w PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 297DN UT WOS:000086066600001 PM 12526389 ER PT J AU Moss, JA Leasure, RM Meyer, TJ AF Moss, JA Leasure, RM Meyer, TJ TI Electrocatalysis in photochemically activated electropolymerized thin films SO INORGANIC CHEMISTRY LA English DT Article ID TRANSFER EXCITED-STATES; PHOTOSUBSTITUTION REACTIONS; RUTHENIUM(II) COMPLEXES; OXIDATION; OSMIUM; RU(II)-POLYPYRIDINE; PHOTOPHYSICS; TEMPERATURE; RU(BPY)32+; CATALYST AB In reductively electropolymerized thin films of poly-cis-[Ru(vbpy)(2)(py)(2)](PF6)(2) ("vbpy" is 4-methyl-4'-vinyl-2,2'-bipyridine and "py" is pyridine), on glassy carbon electrodes, photochemical ligand loss with aqueous HClO4 in the external solution occurs to give poly-cis-[Ru(vbpy)(2)(OH2)(2)](ClO4)(2), but the efficiency of ligand loss is greatly decreased compared to the efficiency in solution. In cyclic voltammograms of films containing the aqua complex, there is evidence for both Ru-III/II and higher oxidation state Ru-IV/III, Ru-V/IV, and Ru-VI/V couples. The redox chemistry of the resulting films is dictated by the film structure and can be controlled by varying the electropolymerization conditions and external solution composition. The oxidation of alcohols by these higher oxidation state couples has been investigated electrochemically. C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. RP Meyer, TJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663,MS A127, Los Alamos, NM 87545 USA. NR 37 TC 16 Z9 16 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 2000 VL 39 IS 6 BP 1052 EP 1058 DI 10.1021/ic990235f PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 297DN UT WOS:000086066600002 PM 12526390 ER PT J AU Schreckenbach, G AF Schreckenbach, G TI Mixed uranium chloride fluorides UF6-nCln and methoxyuranium fluorides UF6-n(OCH3)(n): A theoretical study of equilibrium geometries, vibrational frequencies, and the role of the f orbitals SO INORGANIC CHEMISTRY LA English DT Article ID DENSITY-FUNCTIONAL THEORY; NMR SHIELDING TENSORS; INCLUDING ATOMIC ORBITALS; EFFECTIVE CORE POTENTIALS; ELECTRONIC-STRUCTURE; HARTREE-FOCK; FORCE-FIELDS; SPIN-ORBIT; AB-INITIO; EXCITED-STATES AB The title compounds, the uranium (VI) fluoride chlorides (UF6-nCln, n = 0-6) and methoxyuranium (VI) fluorides [UF6-n(OCH3)(n), n = 0-5], have been studied using relativistic density functional theory. Applying the B3LYP hybrid functional and an effective core potential on uranium, equilibrium geometries have been calculated for these molecules. In addition, harmonic vibrational frequencies have been computed for the chloride fluorides. Calculated frequencies have been compared to experiment where possible. All experimentally observed bands have been assigned, based on these calculations. The average deviation between theoretical and experimental frequencies is 15.6 cm(-1) for 23 experimental modes. Theory always underestimates the experimental frequencies. This can be explained by the calculated bond lengths that are somewhat too long. The electronic structure of the uranium (VI) chloride fluorides has been investigated using scalar relativistic calculations and the PW91 functional. Periodic trends in the role and bonding contribution of the uranium 5f orbitals are discussed. C1 Los Alamos Natl Lab, Theoret Div MS B268, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Seaborg Inst Transactinium Sci, Los Alamos, NM 87545 USA. RP CLRC Daresbury Lab, Dept Computat Sci & Engn, Warrington WA4 4AD, Cheshire, England. NR 86 TC 24 Z9 27 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 EI 1520-510X J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 2000 VL 39 IS 6 BP 1265 EP 1274 DI 10.1021/ic9910615 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 297DN UT WOS:000086066600030 PM 12526418 ER PT J AU Lente, G Guzei, IA Espenson, JH AF Lente, G Guzei, IA Espenson, JH TI Kinetics and mechanism of the monomerization of a Re(V) dithiolato dimer with monodentate ligands. Electronic and steric effects SO INORGANIC CHEMISTRY LA English DT Article ID COMPLEXES; OXIDES AB The sulfur-bridged dimeric dithiolato rhenium(V) chelate [CH3(O)Re(eta(2),mu-o-SCH2C6H4S)](2) (D), derived from 2-mercaptothiophenol, was monomerized to give [CH3(O)Re(eta(2)-o-SCH2C6H4S)]L (M-L) in benzene upon reaction with various neutral and anionic monodentate ligands (L) such as pyridine and its substituted derivatives, triarylphosphines, dimethyl sulfoxide, 4-picoline-N-oxide, and halide ions. The kinetic observations can readily be interpreted for all ligands by a unified mechanism in which the initial fast formation of a 1:1 (DL) and 1:2 (DL2) adduct is followed by the slow monomerization of each species so formed. The use of different ligands gave insight into different steps of the same multistep mechanism. The kinetics of ligand exchange between free L and the monomeric complexes was also studied; an associative pathway has been proposed to interpret the results. The crystal structures of two new monomeric ML complexes (with L = 4-acetylpyridine and 1,3-diethylthiourea) are reported. 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, Ames, IA 50011 USA. RI Lente, Gabor/H-3645-2011 NR 22 TC 31 Z9 31 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 2000 VL 39 IS 6 BP 1311 EP 1319 DI 10.1021/ic991431p PG 9 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 297DN UT WOS:000086066600037 PM 12526425 ER PT J AU White, DA AF White, DA TI Numerical modeling of optical gradient traps using the vector finite element method SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FOCUSED LASER-BEAM; DIELECTRIC PARTICLES; RADIATION PRESSURE; MAXWELL EQUATIONS; FORCE; MANIPULATION; DISPERSION; TWEEZERS AB It has been established that under certain conditions microscopic dielectric objects can be trapped by a tightly focused laser beam. This phenomenon is commonly referred to as an optical gradient trap. The recently developed vector finite element method is used to visualize the interaction of the laser beam with the dielectric object and to quantitatively predict the optical trapping efficiency. The vector finite element method is an accurate and efficient approach when the incident beam wavelength is comparable to the object size, and it has the advantage that it can be used to model the trapping of arbitrarily shaped 3D objects. (C) 2000 Academic Press. C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. RP White, DA (reprint author), Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, POB 808 M-S L-560, Livermore, CA 94551 USA. NR 33 TC 19 Z9 19 U1 1 U2 5 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD MAR 20 PY 2000 VL 159 IS 1 BP 13 EP 37 DI 10.1006/jcph.2000.6422 PG 25 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 298QX UT WOS:000086151600002 ER PT J AU Simmons, NJ Chin, KOA Harnisch, JA Vaidya, B Trahanovsky, WS Porter, MD Angelici, RJ AF Simmons, NJ Chin, KOA Harnisch, JA Vaidya, B Trahanovsky, WS Porter, MD Angelici, RJ TI Synthesis and characterization of a catechol-terminated alkanethiolate monolayer adsorbed on gold SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE dihydroxyphenethyl mercaptan; catechol; gold; monolayers; thiols ID SELF-ASSEMBLED MONOLAYERS; SCANNING TUNNELING MICROSCOPY; SURFACE-CONFINED MONOLAYERS; PHASE PROBE MOLECULES; ELECTROCHEMICAL DESORPTION; REDUCTIVE DESORPTION; THIOLATE MONOLAYERS; ELECTRODE SURFACES; REVERSIBLE REDOX; ORGANIC-SURFACES AB Structural, redox, and metal ion binding characterizations of the monolayer formed by the chemisorption of 3,4-dihydroxyphenethyl mercaptan (DHPM) on gold are described. This system was explored as a model for investigations of surface-immobilized molecules that contain redox-transformable coordination sites for binding metal ions from solution. The characterizations were carried out using infrared reflection spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, and long optical pathlength thin-layer spectroscopy. The XPS data show that this monolayer adsorbs as a thiolate, and the IRS results indicate that the average orientation of the aromatic ring plane is close to the surface normal. Cyclic voltammetry reveals that the pendant catechol/quinone undergoes the expected two-electron, two-proton redox transformation; however, the oxidized form of the couple is unstable, particularly in alkaline aqueous solutions. A determination of Cu(II) binding ability to the surface-immobilized catechol moieties, using a long optical pathlength thin-layer cell to follow the depletion of Cu(II) from solution, indicated that the complexation of the metal was not substantially different from that for the solution form of catechol. The instability of the oxidized form of the ligand, nevertheless, precluded an assessment of its metal ion binding ability. An approach using these data for estimating the conditional formation constant for the surface complexation reaction is also developed. (C) 2000 Elsevier Science S.A. All rights reserved. C1 US DOE, Ames Lab, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames, IA 50011 USA. RP Porter, MD (reprint author), US DOE, Ames Lab, Dept Chem, Ames, IA 50011 USA. NR 60 TC 13 Z9 13 U1 3 U2 9 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 20 PY 2000 VL 482 IS 2 BP 178 EP 187 DI 10.1016/S0022-0728(00)00046-2 PG 10 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 326XM UT WOS:000087762600010 ER PT J AU Bakac, A AF Bakac, A TI Photoinduced insertion of molecular oxygen into metal-hydrogen bonds SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article DE molecular oxygen ID ELECTRON-TRANSFER REACTIONS; EXCITED-STATES; COMPLEXES; ION; THERMODYNAMICS; HYDROCARBONS; CHEMISTRY; OXIDATION; REDUCTION; HYDRIDES AB Rhodium(III) hydrides L(H2O)RhH2+ (L=(NH3)(4) and [14]aneN(4)) are efficient quenchers for the excited uranyl ions, *UO22+. In the presence of molecular oxygen, the reaction ultimately yields the hydroperoxorhodium complexes, L(H2O)RhOOH2+. The replacement of the coordinated hydride by deuteride and the solvent H2O by D2O results in a combined kinetic isotope effect of 1.5 for the macrocyclic complex. The proposed mechanism features L(H2O)Rh2+, L(H2O)RhOO2+, and UO2+ as intermediates. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RP Bakac, A (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. NR 27 TC 13 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD MAR 20 PY 2000 VL 132 IS 1-2 BP 87 EP 89 DI 10.1016/S1010-6030(99)00239-7 PG 3 WC Chemistry, Physical SC Chemistry GA 297FM UT WOS:000086071300013 ER PT J AU Brenneman, MA Weiss, AE Nickoloff, JA Chen, DJ AF Brenneman, MA Weiss, AE Nickoloff, JA Chen, DJ TI XRCC3 is required for efficient repair of chromosome breaks by homologous recombination SO MUTATION RESEARCH-DNA REPAIR LA English DT Article DE XRCC3; homologous recombination; DNA double-strand breaks; DNA repair; chromosome breaks; chromosomal stability ID RAY-SENSITIVE MUTANTS; CROSS-LINKING AGENTS; DNA-REPAIR; IONIZING-RADIATION; IN-VIVO; VERTEBRATE CELLS; MAMMALIAN-CELLS; GENE; REPLICATION; RESISTANCE AB XRCC3 was originally identified as a human gene able to complement the DNA damage sensitivity, chromosomal instability and impaired growth of the mutant hamster cell line irs1SF. More recently, it has been cloned, sequenced and found to bear sequence homology to the highly conserved eukaryotic repair and recombination gene RAD51. The phenotype of irs1SF and the identification of XRCC3 as a member of the RAD51 gene family have suggested a role for XRCC3 in repair of DNA damage by homologous recombination. Homologous recombinational repair (HRR) of a specifically induced chromosomal double-strand break (DSB) was assayed in irs1SF cells with and without transient complementation by human XRCC3;I. Complementation with XRCC3 increased the frequencies of repair by 34- to 260-fold. The results confirm a role for XRCC3 in HRR of DNA DSB, and the importance of this repair pathway for the maintenance of chromosomal integrity in mammalian cells. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. Univ Calif Los Alamos Natl Lab, Div Life Sci, Los Alamos, NM USA. Univ New Mexico, Sch Med, Dept Mol Genet & Microbiol, Albuquerque, NM 87131 USA. RP Chen, DJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, MS 74-157,1 Cyclotron Rd, Berkeley, CA 94720 USA. FU NCI NIH HHS [CA74046] NR 39 TC 129 Z9 135 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8777 J9 MUTAT RES-DNA REPAIR JI Mutat. Res.-DNA Repair PD MAR 20 PY 2000 VL 459 IS 2 BP 89 EP 97 DI 10.1016/S0921-8777(00)00002-1 PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology GA 297MP UT WOS:000086086900001 PM 10725659 ER PT J AU Hollowood, TJ Khoze, VV Lee, W Mattis, MP AF Hollowood, TJ Khoze, VV Lee, W Mattis, MP TI Breakdown of cluster decomposition in instanton calculations of the gluino condensate SO NUCLEAR PHYSICS B LA English DT Article ID SUPERSYMMETRIC GAUGE-THEORIES; MULTIINSTANTON CALCULUS; BREAKING; QCD; MATTER AB A longstanding puzzle concerns the calculation of the gluino condensate [tr lambda(2)/16 pi(2)] = c Lambda(3) in N = 1 supersymmetric SU(N) gauge theory: so-called weak-coupling instanton (WCI) calculations give c = 1, whereas strong-coupling instanton (SCI) calculations give, instead, c = By examining correlators of this condensate in arbitrary multi-instanton sectors, we cast serious doubt on the SCI calculation of [tr lambda(2)/16 pi(2)] by showing that an essential step-namely cluster decomposition-is invalid. We also show that the addition of a so-called Kovner-Shifman vacuum (in which [tr lambda(2)/16 pi(2)] = 0) cannot straightforwardly resolve this mismatch. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Los Alamos Natl Lab, Theoret Div T8, Los Alamos, NM 87545 USA. Univ Coll Swansea, Dept Phys, Swansea SA2 8PP, W Glam, Wales. Univ Durham, Dept Phys, Durham DH1 3LE, England. RP Los Alamos Natl Lab, Theoret Div T8, Los Alamos, NM 87545 USA. OI Khoze, Valentin V/0000-0003-3006-4147 NR 38 TC 27 Z9 27 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 MAR 20 PY 2000 VL 570 IS 1-2 BP 241 EP 266 DI 10.1016/S0550-3213(99)00503-9 PG 26 WC Physics, Particles & Fields SC Physics GA 301VZ UT WOS:000086332100009 ER PT J AU Hall, L Murayama, H Weiner, N AF Hall, L Murayama, H Weiner, N TI Neutrino mass anarchy SO PHYSICAL REVIEW LETTERS LA English DT Article ID TEXTURES; MATRICES AB What is the form of the neutrino mass matrix which governs the oscillations of the atmospheric and solar neutrinos? Features of the data have led to a dominant viewpoint where the mass matrix has an ordered, regulated pattern, perhaps dictated by a flavor symmetry. We challenge this viewpoint and demonstrate that the data are well accounted for by a neutrino mass matrix which appears to have random entries. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Theory Grp, Berkeley, CA 94720 USA. RP Hall, L (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Murayama, Hitoshi/A-4286-2011 NR 41 TC 193 Z9 194 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 20 PY 2000 VL 84 IS 12 BP 2572 EP 2575 DI 10.1103/PhysRevLett.84.2572 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400006 ER PT J AU Halyo, V Kim, P Lee, ER Lee, IT Loomba, D Perl, ML AF Halyo, V Kim, P Lee, ER Lee, IT Loomba, D Perl, ML TI Search for free fractional electric charge elementary particles using an automated Millikan oil drop technique SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have carried out a direct search in bulk matter for free fractional electric charge elementary particles using the largest mass single sample ever studied-about 17.4 mg of silicone oil. The search used an improved and highly automated Millikan oil drop technique. No evidence for fractional charge particles was found. The concentration of particles with fractional charge more than 0.16e (e bring the magnitude of the electron charge) from the nearest integer charge is less than 4.71 X 10(-22) particles per nucleon with 95% confidence. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Halyo, V (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 13 TC 26 Z9 26 U1 1 U2 20 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 MAR 20 PY 2000 VL 84 IS 12 BP 2576 EP 2579 DI 10.1103/PhysRevLett.84.2576 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400007 ER PT J AU Ma, H Appel, R Atoyan, GS Bassalleck, B Bergman, DR Cheung, N Dhawan, S Do, H Egger, J Eilerts, S Fischer, H Herold, W Issakov, VV Kaspar, H Kraus, DE Lazarus, DM Lichard, P Lowe, J Lozano, J Majid, W Menzel, W Pislak, S Poblaguev, AA Rehak, P Sher, A Thompson, JA Truol, P Zeller, ME AF Ma, H Appel, R Atoyan, GS Bassalleck, B Bergman, DR Cheung, N Dhawan, S Do, H Egger, J Eilerts, S Fischer, H Herold, W Issakov, VV Kaspar, H Kraus, DE Lazarus, DM Lichard, P Lowe, J Lozano, J Majid, W Menzel, W Pislak, S Poblaguev, AA Rehak, P Sher, A Thompson, JA Truol, P Zeller, ME TI New measurement of the rare decay K+ -> pi(+)mu(+)mu(-) SO PHYSICAL REVIEW LETTERS LA English DT Article ID KAON DECAYS; K+->PI+MU+MU; K+->PI+L+L AB More than 400 K+ --> pi(+) mu(+) mu(-) events were observed in a rare K+ decay experiment at the Brookhaven Alternating Gradient Synchrotron. Normalized to the K+ --> pi(+) pi(+) pi(-) decay, the branching ratio is determined to be [9.22 +/- 0.60(stat) +/- 0.49(syst)] X 10(-8). This branching ratio and the mu mu mass spectrum is in very good agreement with the measurement of the K+ --> pi(+) e(+) e(-) decay, but deviates significantly from the previous measurement. C1 Yale Univ, Dept Phys, New Haven, CT 06511 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA. Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA. Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Univ Basel, Inst Phys, CH-4046 Basel, Switzerland. Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland. RP Ma, H (reprint author), Rutgers State Univ, Piscataway, NJ 08855 USA. RI Lichard, Peter/A-4459-2010 OI Lichard, Peter/0000-0003-1581-8545 NR 15 TC 39 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 20 PY 2000 VL 84 IS 12 BP 2580 EP 2583 DI 10.1103/PhysRevLett.84.2580 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400008 ER PT J AU Airapetian, A Akopov, N Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Brack, J Brauksiepe, S Braun, B Bruckner, W Brull, A Bulten, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Garber, Y Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grosshauser, C Guidal, M Gute, A Haeberli, W Hansen, JO Hasch, D Hausser, O Heinsius, FH Henderson, R Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kisselev, A Kitching, P Kobayashi, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Kurisuno, M Kyle, G Lachnit, W Lorenzon, W Makins, NCR Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, FM Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Most, A Muccifora, V Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, M Nowak, WD O'Neill, TG Openshaw, R Ouyang, J Owen, BR Pate, SF Potashov, S Potterveld, DH Rakness, G Redwine, R Reolon, AR Ristinen, R Rith, K Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Scarlett, C Schafer, A Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA Shibatani, K Shin, T Shutov, V Simani, C Simon, A Sinram, K Slavich, P Spengos, M Steffens, E Stenger, J Stewart, J Stoesslein, U Sutter, M Tallini, H Taroian, S Terkulov, A Tipton, B Tytgat, M Uriuoli, GM van de Vyver, R van den Brand, JFJ van der Steenhoven, G van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Wander, W Wendland, J Williamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H AF Airapetian, A Akopov, N Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Brack, J Brauksiepe, S Braun, B Bruckner, W Brull, A Bulten, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Garber, Y Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grosshauser, C Guidal, M Gute, A Haeberli, W Hansen, JO Hasch, D Hausser, O Heinsius, FH Henderson, R Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kisselev, A Kitching, P Kobayashi, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Kurisuno, M Kyle, G Lachnit, W Lorenzon, W Makins, NCR Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, FM Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Most, A Muccifora, V Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, M Nowak, WD O'Neill, TG Openshaw, R Ouyang, J Owen, BR Pate, SF Potashov, S Potterveld, DH Rakness, G Redwine, R Reolon, AR Ristinen, R Rith, K Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Scarlett, C Schafer, A Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA Shibatani, K Shin, T Shutov, V Simani, C Simon, A Sinram, K Slavich, P Spengos, M Steffens, E Stenger, J Stewart, J Stoesslein, U Sutter, M Tallini, H Taroian, S Terkulov, A Tipton, B Tytgat, M Uriuoli, GM van de Vyver, R van den Brand, JFJ van der Steenhoven, G van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Wander, W Wendland, J Williamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H CA HERMES Collaboration TI Measurement of the spin asymmetry in the photoproduction of pairs of high-p(T) hadrons at HERMES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEEP-INELASTIC-SCATTERING; LEPTON-NUCLEON SCATTERING; MONTE-CARLO GENERATOR; ORDER QCD ANALYSIS; QUARK DISTRIBUTIONS; POLARIZED GLUON; HERA; COLLISIONS; MESONS; PROTON AB We present a measurement of the longitudinal spin asymmetry Ali in photoproduction of pairs of hadrons with high transverse momentum pi. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h(+)h(-) pairs with p(T)(h1) > 1.5 GeV/c and p(T)(h2) > 1.0 GeV/c, the measured asymmetry is A(parallel to) = -0.28 +/- 0.12(stat) +/- 0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering: from protons, and is interpreted to arise from a positive gluon polarization. C1 Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada. Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA. Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA. DESY, Deutsch Elekt Synchrotron, 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. Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Florida Int Univ, Dept Phys, Miami, FL 33199 USA. Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany. State Univ Ghent, Dept Subat & Radiat Phys, B-9000 Ghent, Belgium. Max Planck Inst Kernphys, D-69029 Heidelberg, Germany. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Marburg, Inst Phys, D-35037 Marburg, Germany. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. PN Lebedev Phys Inst, Moscow 117924, Russia. Univ Munich, Sekt Phys, D-85748 Garching, Germany. New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA. NIKHEF, NL-1009 DB Amsterdam, Netherlands. Petersburg Nucl Phys Inst, St Petersburg 188350, Russia. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy. Ist Super Sanita, Phys Lab, I-00161 Rome, Italy. TRIUMF, Vancouver, BC V6T 2A3, Canada. Tokyo Inst Technol, Tokyo 152, Japan. Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands. Yerevan Phys Inst, Yerevan 375036, Armenia. RP Airapetian, A (reprint author), Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada. RI Gavrilov, Gennady/C-6260-2013; Holt, Roy/E-5803-2011; Kozlov, Valentin/M-8000-2015; Terkulov, Adel/M-8581-2015; Cisbani, Evaristo/C-9249-2011 OI Cisbani, Evaristo/0000-0002-6774-8473 NR 35 TC 179 Z9 179 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 MAR 20 PY 2000 VL 84 IS 12 BP 2584 EP 2588 DI 10.1103/PhysRevLett.84.2584 PG 5 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400009 ER PT J AU Alavi-Harati, A Alexopoulos, T Arenton, M Arisaka, K Averitte, S Barker, AR Bellantoni, L Bellavance, A Belz, J Ben-David, R Bergman, DR Blucher, E Bock, GJ Bown, C Bright, S Cheu, E Childress, S Coleman, R Corcoran, MD Corti, G Cox, B Crisler, MB Erwin, AR Ford, R Glazov, A Golossanov, A Graham, G Graham, J Hagan, K Halkiadakis, E Hanagaki, K Hidaka, S Hsiung, YB Jejer, V Jensen, DA Kessler, R Kobrak, HGE LaDue, J Lath, A Ledovskoy, A McBride, PL McManus, AP Mikelsons, P Monnier, E Nakaya, T Nelson, KS Nguyen, H O'Dell, V Pang, M Pordes, R Prasad, V Qiao, C Quinn, B Ramberg, EJ Ray, RE Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, PS Slater, W Solomey, N Somalwar, SV Stone, RL Suzuki, I Swallow, EC Taegar, SA Tesarek, RJ Thomson, GB Toale, PA Tripathi, A Tschirhart, R Wah, YW Wang, J White, HB Whitmore, J Winstein, B Winston, R Yamanaka, T Zimmerman, ED AF Alavi-Harati, A Alexopoulos, T Arenton, M Arisaka, K Averitte, S Barker, AR Bellantoni, L Bellavance, A Belz, J Ben-David, R Bergman, DR Blucher, E Bock, GJ Bown, C Bright, S Cheu, E Childress, S Coleman, R Corcoran, MD Corti, G Cox, B Crisler, MB Erwin, AR Ford, R Glazov, A Golossanov, A Graham, G Graham, J Hagan, K Halkiadakis, E Hanagaki, K Hidaka, S Hsiung, YB Jejer, V Jensen, DA Kessler, R Kobrak, HGE LaDue, J Lath, A Ledovskoy, A McBride, PL McManus, AP Mikelsons, P Monnier, E Nakaya, T Nelson, KS Nguyen, H O'Dell, V Pang, M Pordes, R Prasad, V Qiao, C Quinn, B Ramberg, EJ Ray, RE Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, PS Slater, W Solomey, N Somalwar, SV Stone, RL Suzuki, I Swallow, EC Taegar, SA Tesarek, RJ Thomson, GB Toale, PA Tripathi, A Tschirhart, R Wah, YW Wang, J White, HB Whitmore, J Winstein, B Winston, R Yamanaka, T Zimmerman, ED CA KTeV Collaboration TI Search for the weak decay of a lightly bound H-0 dibaryon SO PHYSICAL REVIEW LETTERS LA English DT Article ID H-DIBARYON; BARYONS AB We present results of a search fur a new form of hadronic matter, a six-quark, dibaryon state called the H-0, a state predicted to exist in several theoretical models. Analyzing data collected by experiment E799-II at Fermilab, we searched for the decay H-0 --> Lambda p pi(-) and found no candidate events. We place an upper limit on [B(H-0 --> Lambda p pi(-))d sigma(H)/d Omega]/(d sigma equivalent to/d Omega) and; in the context of published models, exclude the region of lightly bound mass states just below the Lambda Lambda mass threshold, 2.194 < M-H < 2.231 GeV/c(2), with lifetimes from similar to 5 X 10(-10) sec to similar to 1 X 10(-3) sec. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Arizona, Tucson, AZ 85721 USA. Univ Calif Los Angeles, Los Angeles, CA 90095 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Univ Colorado, Boulder, CO 80309 USA. Elmhurst Coll, Elmhurst, IL 60126 USA. Osaka Univ, Toyonaka, Osaka 560, Japan. Rice Univ, Houston, TX 77005 USA. Rutgers State Univ, Piscataway, NJ 08855 USA. Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA. Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA. Univ Wisconsin, Madison, WI 53706 USA. RP Ben-David, R (reprint author), Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. NR 18 TC 21 Z9 21 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 MAR 20 PY 2000 VL 84 IS 12 BP 2593 EP 2597 DI 10.1103/PhysRevLett.84.2593 PG 5 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400011 ER PT J AU Yoshida, S Reinhold, CO Burgdorfer, J AF Yoshida, S Reinhold, CO Burgdorfer, J TI Quantum localization of the kicked Rydberg atom SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCITED HYDROGEN-ATOMS; IONIZATION; CHAOS AB We investigate the quantum localization of the one-dimensional Rydberg atom subject to a unidirectional periodic train of impulses. For high frequencies of the train the classical system becomes chaotic and leads to fast ionization. By contrast, the quantum system is found to be remarkably stable. We find this quantum localization to be directly related to the existence of "scars" of the unstable periodic orbits of the system. The localization length is given by the energy excursion along the periodic orbits. C1 Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Vienna Tech Univ, Inst Theoret Phys, A-1040 Vienna, Austria. RP Yoshida, S (reprint author), Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 16 TC 30 Z9 30 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 MAR 20 PY 2000 VL 84 IS 12 BP 2602 EP 2605 DI 10.1103/PhysRevLett.84.2602 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400013 ER PT J AU Zweiback, J Smith, RA Cowan, TE Hays, G Wharton, KB Yanovsky, VP Ditmire, T AF Zweiback, J Smith, RA Cowan, TE Hays, G Wharton, KB Yanovsky, VP Ditmire, T TI Nuclear fusion driven by Coulomb explosions of large deuterium clusters SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTENSE LASER-PULSES; ATOMIC CLUSTERS; XE CLUSTERS; GAS AB Recent experiments on the interaction of intense, ultrafast laser pulses with large van der Waals bonded clusters have shown that these clusters can explode with substantial kinetic energy. By driving explosions in deuterium clusters with a 35 fs laser pulse, we have accelerated ions to sufficient kinetic energy to produce DD nuclear fusion. By diagnosing the fusion yield through measurements of 2.45 MeV fusion neutrons, we have found that the fusion yield from these exploding clusters varies strongly with the cluster size, consistent with acceleration of deuterons via Coulomb explosion forces. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England. RP Yanovsky, VP (reprint author), Univ Michigan, Ctr Ultrafast Opt Studies, Ann Arbor, MI 48109 USA. RI Yanovsky, Victor/B-5899-2008; Cowan, Thomas/A-8713-2011 OI Cowan, Thomas/0000-0002-5845-000X NR 17 TC 261 Z9 272 U1 2 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 20 PY 2000 VL 84 IS 12 BP 2634 EP 2637 DI 10.1103/PhysRevLett.84.2634 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400021 ER PT J AU Dodgson, MJW Koshelev, AE Geshkenbein, VB Blatter, G AF Dodgson, MJW Koshelev, AE Geshkenbein, VB Blatter, G TI Evaporation of the pancake-vortex lattice in weakly coupled layered superconductors SO PHYSICAL REVIEW LETTERS LA English DT Article ID UNIVERSAL PHASE-DIAGRAM; MONTE-CARLO SIMULATION; HIGH-TC SUPERCONDUCTOR; C SUPERCONDUCTORS; VORTICES; ORDER; YBA2CU3O7-DELTA; MAGNETIZATION; BI2SR2CACU2O8; MODEL AB We calculate the melting line of the pancake-vortex system in a layered superconductor, interpolating between two-dimensional (2D) melting at high fields and the zero-field limit of single-stack evaporation. Long-range interactions between pancake vortices in different layers permit a mean-field approach, the "substrate model," where each 2D crystal fluctuates in a substrate potential duc to the vortices in other layers. We find the thermal stability limit of the 3D solid, and compare the free energy to a 2D liquid to determine the first-order molting transition and its jump in entropy. C1 ETH Honggerberg, CH-8093 Zurich, Switzerland. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. LD Landau Theoret Phys Inst, Moscow 117940, Russia. RP Dodgson, MJW (reprint author), Univ Cambridge, Cavendish Lab, Condensed Matter Theory Grp, Cambridge CB3 0HE, England. RI Koshelev, Alexei/K-3971-2013 OI Koshelev, Alexei/0000-0002-1167-5906 NR 30 TC 28 Z9 28 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 20 PY 2000 VL 84 IS 12 BP 2698 EP 2701 DI 10.1103/PhysRevLett.84.2698 PG 4 WC Physics, Multidisciplinary SC Physics GA 294RP UT WOS:000085924400037 ER PT J AU Moore, DP Ozturk, O Schumann, FO Morton, SA Waddill, GD AF Moore, DP Ozturk, O Schumann, FO Morton, SA Waddill, GD TI Ultrathin vanadium films on Cu(001): structure and magnetism SO SURFACE SCIENCE LA English DT Article DE growth; low energy electron diffraction (LEED); metallic films; photoelectron diffraction ID FERROMAGNETIC ORDER; METAMAGNETIC STATES; CRITICAL-BEHAVIOR; EPITAXIAL-FILMS; METAL-SURFACES; THIN-FILMS; CU(100); FE; NANOSTRUCTURES; PHOTOEMISSION AB X-ray photoelectron diffraction (XPD), low energy electron diffraction (LEED), and magnetic linear dichroism in angular distributions of photoelectrons (MLDAD) have been used to study the structural and magnetic properties of V thin films on Cu(001). For room-temperature growth, XPD and LEED data indicate that below 1 monolayer (ML), equivalent V films exhibit a (2 x 1) structure that evolves to four domains of bcc (110) at coverages above 1 ML. This multi-domain structure produces a LEED pattern often referred to as '(3 x 1)'. This structure persists to V coverages as high as 100 hit, and the LEED and XPD angular scans indicate that V in these films retains the bulk V lattice constant. MLDAD results for 1-5 ML V films at room temperature and at 150 K provide no evidence for in-plane magnetic ordering. Annealing to 450 degrees C results in V clustering at low coverages accompanied by Cu diffusion. For thick V films, the primary affect of annealing is interdiffusion of Cu and V. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Missouri, Dept Phys, Rolla, MO 65401 USA. Univ Calif Lawrence Livermore Natl Lab, Dept Chem & Mat Sci, Livermore, CA 94550 USA. RP Waddill, GD (reprint author), Univ Missouri, Dept Phys, Rolla, MO 65401 USA. RI Schumann, Frank /K-9364-2014 NR 33 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 20 PY 2000 VL 449 IS 1-3 BP 31 EP 42 DI 10.1016/S0039-6028(99)01249-2 PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 296ZN UT WOS:000086056800011 ER PT J AU Salazar, MR Saravanan, C Kress, JD Redondo, A AF Salazar, MR Saravanan, C Kress, JD Redondo, A TI Molecular and atomic oxygen on unpromoted and cesium promoted Ag(111) surfaces SO SURFACE SCIENCE LA English DT Article DE chemisorption; density functional calculations; oxygen; silver ID SELECTIVE ETHYLENE OXIDATION; EFFECTIVE CORE POTENTIALS; DIPPED ADCLUSTER MODEL; SILVER SURFACES; AG SURFACE; DISSOCIATIVE CHEMISORPTIONS; CATALYTIC-OXIDATION; OLEFIN EPOXIDATION; SINGLE-CRYSTAL; O-2 AB Using density functional theory, the energetics of chemisorption and dissociation are computed for molecular oxygen on an unpromoted and a cesium promoted cluster model of the reduced [111] surface of silver. The computed barriers and thermochemistry for our model clusters suggest that dissociation on unpromoted Ag(111) surfaces is activated, but thermochemically favored. Our computed barrier heights and product energies for the unpromoted silver cluster are compared with experimental data. The activation energy for dissociation on the cesium promoted surface shows a cesium coverage dependence, but, again the dissociated product is thermochemically favored. Atomic charges on all atoms were computed for both the unpromoted and promoted cluster models. Analysis of the atomic charges indicates that cesium acts as an electron donor to the silver cluster and that oxygen extracts a portion of the donated electron density from the cluster. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Grp T 12, Los Alamos, NM 87545 USA. Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA. RP Salazar, MR (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Grp T 12, POB 1663, Los Alamos, NM 87545 USA. NR 53 TC 19 Z9 19 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 20 PY 2000 VL 449 IS 1-3 BP 75 EP 92 DI 10.1016/S0039-6028(99)01214-5 PG 18 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 296ZN UT WOS:000086056800015 ER PT J AU Henderson, MA Chambers, SA AF Henderson, MA Chambers, SA TI HREELS, TPD and XPS study of the interaction of water with the alpha-Cr2O3(001) surface SO SURFACE SCIENCE LA English DT Article DE chromium; electron energy loss spectroscopy (EELS); single crystal epitaxy; surface chemical reaction; thermal desorption spectroscopy; vibrations of adsorbed molecules; water; X-ray photoelectron spectroscopy ID MOLECULAR-DYNAMICS SIMULATIONS; ENERGY-ELECTRON DIFFRACTION; INITIO TOTAL-ENERGY; OXIDE SURFACES; ALUMINA SURFACES; ADSORPTION; CR2O3(111)/CR(110); CR2O3(0001); SPECTROSCOPY; DISSOCIATION AB The interaction of water with the (001) surface of alpha-Cr2O3 was examined with temperature programmed desorption (TPD), high resolution electron energy-loss spectroscopy (HREELS) and X-ray photoelectron spectroscopy (XPS). Two alpha-Cr2O3(001) surfaces were examined, both of which were grown on alpha-Al2O3(001) substrates using oxygen plasma-assisted molecular beam epitaxy (MBE). The two surfaces differed in that one was grown with alpha-Fe2O3 interlayers whereas the other was grown directly on alpha-Al2O3(001). The in-plane lattice spacing of the alpha-Cr2O3(001) surface on alpha-Fe2O3/alpha-Al2O3(001) was 2% expansively strained relative to the unstrained alpha-Cr2O3(001) surface grown directly on alpha-Al2O3(001). Both the strained and unstrained surfaces exhibited similar water TPD behavior, with the possible exception that the desorption states of water on the strained surface were shifted slightly to lower temperatures relative to those on the unstrained surface. Water adsorbs on alpha-Cr2O3(001) in both molecular and dissociative states, with the former desorbing in TPD at 295 K and the latter at 345 K. TPD uptake measurements and XPS data suggest that each surface Cr3+ atom has the capacity to bind two water molecules, one in a molecular state and one in a dissociative state. Water in the dissociative state is comprised of two distinct OH groups based on HREELS, one of which is a terminal group with a nu(OH) mode at 3600 cm(-1) and the other of which is presumably a bridging group with a nu(OH) mode at 2885 cm(-1). These losses shift to 2645 and 2120 cm(-1) with D2O adsorption. The low loss energy for the bridging OH/OD group indicates its involvement in a very strong hydrogen-bonded interaction with another species, presumably the oxygen atom of the terminal OH group. This pairing behavior is likely responsible for the first-order desorption kinetics observed for the recombinative desorption state at 345 K. The hydrogen-bonding interaction is unusually strong, as exemplified by the very low nu(OH) frequency for the bridging OH group. Studies on the oxygen pre-exposed surface indicate that oxygen atoms, formed by O-2 dissociation, block the H2O dissociative channel but do not block the molecular adsorption channel. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Henderson, MA (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, POB 999,MS M8-93, Richland, WA 99352 USA. NR 46 TC 61 Z9 61 U1 2 U2 46 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 20 PY 2000 VL 449 IS 1-3 BP 135 EP 150 DI 10.1016/S0039-6028(99)01246-7 PG 16 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 296ZN UT WOS:000086056800020 ER PT J AU Steimle, TC Costen, ML Hall, GE Sears, TJ AF Steimle, TC Costen, ML Hall, GE Sears, TJ TI Transient frequency modulation absorption spectroscopy of molecules produced in a laser ablation supersonic expansion source SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SPECTRA; TIS AB Transient frequency modulation absorption spectroscopy has been applied to transition metal containing molecules generated in a laser ablation/chemical reaction supersonic expansion. The (0,0) A "(1)Sigma(+) - X(1)Sigma(+) band system of PtC (v = 12643 cm(-1)) and the (1,0) C(3)Delta(1)-X(3)Delta sub-band system of TiS (v = 12065 cm(-1)) were recorded in single pass through the expanding gas 4 cm from the source. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Steimle, TC (reprint author), Arizona State Univ, Dept Chem & Biochem, POB 871604, Tempe, AZ 85287 USA. RI Sears, Trevor/B-5990-2013; Hall, Gregory/D-4883-2013; Costen, Matthew/K-5178-2012 OI Sears, Trevor/0000-0002-5559-0154; Hall, Gregory/0000-0002-8534-9783; Costen, Matthew/0000-0002-6491-9812 NR 29 TC 12 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 17 PY 2000 VL 319 IS 3-4 BP 363 EP 367 DI 10.1016/S0009-2614(00)00133-0 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 294VF UT WOS:000085930500027 ER PT J AU Unal, O Sordelet, DJ AF Unal, O Sordelet, DJ TI In-plane tensile strength and residual stress in thick Al2O3 coatings on aluminum alloy SO SCRIPTA MATERIALIA LA English DT Article DE coating; strength; residual stress ID MODULUS C1 US DOE, Ames Lab, Ames, IA 50011 USA. RP Unal, O (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. NR 9 TC 14 Z9 16 U1 0 U2 1 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 MAR 17 PY 2000 VL 42 IS 7 BP 631 EP 636 DI 10.1016/S1359-6462(99)00401-7 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 300ZH UT WOS:000086283300002 ER PT J AU Wang, J Shi, FG Nieh, TG Zhao, B Brongo, MR Qu, S Rosenmayer, T AF Wang, J Shi, FG Nieh, TG Zhao, B Brongo, MR Qu, S Rosenmayer, T TI Thickness dependence of elastic modulus and hardness of on-wafer low-k ultrathin polytetrafluoroethylene films SO SCRIPTA MATERIALIA LA English DT Article DE thin films; nanoindentation; polytetrafluoroethylene; dielectric materials; Young's modulus; hardness ID MECHANICAL-PROPERTIES; YOUNG MODULUS; THIN; NANOINDENTATION; SYSTEMS; LOAD C1 Univ Calif Irvine, Dept Chem & Biochem Engn & Mat Sci, Irvine, CA 92697 USA. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Conexant Syst Inc, Newport Beach, CA 92660 USA. WL Gore & Assoc Inc, Eau Claire, WI 54701 USA. RP Univ Calif Irvine, Dept Chem & Biochem Engn & Mat Sci, Irvine, CA 92697 USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 36 TC 36 Z9 36 U1 1 U2 6 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 MAR 17 PY 2000 VL 42 IS 7 BP 687 EP 694 DI 10.1016/S1359-6462(99)00421-2 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 300ZH UT WOS:000086283300010 ER PT J AU Demos, SG Burnham, A Wegner, P Norton, M Zeller, L Runkel, M Kozlowski, MR Staggs, M Radousky, HB AF Demos, SG Burnham, A Wegner, P Norton, M Zeller, L Runkel, M Kozlowski, MR Staggs, M Radousky, HB TI Surface defect generation in optical materials under high fluence laser irradiation in vacuum SO ELECTRONICS LETTERS LA English DT Article AB It is shown that irradiation of optical materials with high fluence ultraviolet laser pulses at lour pressure leads to a rapid growth in the surface defect population and degradation of their performance. Experiments have been performed in nonlinear KH2PO4 crystal and in fused silica, and surface defect populations have been observed following a few tens of high fluence 351nm pulses. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Demos, SG (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-411, Livermore, CA 94551 USA. NR 6 TC 20 Z9 22 U1 1 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 16 PY 2000 VL 36 IS 6 BP 566 EP 567 DI 10.1049/el:20000419 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA 302TD UT WOS:000086381000057 ER PT J AU Bergin, MH Schwartz, SE Halthore, RN Ogren, JA Hlavka, DL AF Bergin, MH Schwartz, SE Halthore, RN Ogren, JA Hlavka, DL TI Comparison of aerosol optical depth inferred from surface measurements with that determined by Sun photometry for cloud-free conditions at a continental US site SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID RAMAN LIDAR MEASUREMENTS; ANTHROPOGENIC AEROSOLS; HYGROSCOPIC GROWTH; AMMONIUM-NITRATE; LIGHT-SCATTERING; BOUNDARY-LAYER; CLIMATE; EXTINCTION; BACKSCATTERING; APPORTIONMENT AB Evaluation of the forcing of climate by aerosol scattering of shortwave radiation in cloud-free conditions(direct aerosol forcing) requires knowledge of aerosol optical properties on relevant spatial and temporal scales. It is convenient to measure these properties at the surface. However, before these measurements can be used to quantitatively estimate direct climate forcing, it is necessary to determine the extent to which these properties are representative of the entire atmospheric column. In this paper we compare aerosol optical depth (AOD) determined by Sun photometry at the Southern Great Plains (SGP) Atmospheric Radiation Measurement (ARM) site in north central Oklahoma for several cloud-free days with estimates of AOD based on two methods. First, the aerosol extinction measured at the surface (taken as the sum of the aerosol scattering and absorption coefficients at instrumental relative humidity of similar to 20%) is multiplied by the mixing height determined from temperature profiles from radiosonde measurements. Even under conditions of vigorous midday mixing this approach underestimates AOD by as much as 70% using dry aerosol measurements and by roughly 40% when hygroscopic growth of aerosol under ambient relative humidity is taken into account. This discrepancy is attributed primarily to underestimation of aerosol column extinction, as confirmed by examination of normalized aerosol backscatter profiles obtained from micropulse lidar (MPL), which show substantial contributions of aerosol loading above the atmospheric boundary layer. The second approach uses MPL profiles of normalized aerosol backscatter to estimate the vertical profile of aerosol extinction using surface values. The resulting AOD's are on average 30% less than measured values. This discrepancy is attributed to hygroscopic growth of aerosols in the atmospheric column. The results show that at the SGP site even under conditions of vigorous mixing in the atmospheric boundary layer the aerosol optical depth cannot be estimated with surface measurements of aerosol extinction unless information on the vertical profile of aerosol extinction is taken into account. C1 Brookhaven Natl Lab, Environm Chem Div, Upton, NY 11973 USA. NOAA, Climate Monitoring & Diagnost Lab, Boulder, CO 80303 USA. NASA, Goddard Space Flight Ctr, Sci Syst & Applicat Div, Greenbelt, MD 20771 USA. RP Bergin, MH (reprint author), Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. EM mike.bergin@ce.gatech.edu RI Schwartz, Stephen/C-2729-2008; Ogren, John/M-8255-2015 OI Schwartz, Stephen/0000-0001-6288-310X; Ogren, John/0000-0002-7895-9583 NR 37 TC 30 Z9 31 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 16 PY 2000 VL 105 IS D5 BP 6807 EP 6816 DI 10.1029/1999JD900454 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 294KT UT WOS:000085911000016 ER PT J AU Abdul-Razzak, H Ghan, SJ AF Abdul-Razzak, H Ghan, SJ TI A parameterization of aerosol activation 2. Multiple aerosol types SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CLOUD-CONDENSATION-NUCLEI; ORGANIC AEROSOLS; SEA-SALT; PARTICLES; BEHAVIOR; SULFATE AB A parameterization of the activation of a lognormal size distribution of aerosols to form cloud droplets is extended to the case of multiple externally mixed lognormal modes, each composed of a uniform internal mixture of soluble and insoluble material. The Kohler theory is used to relate the aerosol size distribution and composition to the number activated as a function of maximum supersaturation. The supersaturation balance is used to determine the maximum supersaturation, accounting for particle growth both before and after the particles are activated. Comparison of the parameterized activation of two competing: aerosol modes with detailed numerical simulations of the activation process yields agreement to within 10% under a wide variety of conditions, including diverse size distributions, number concentrations: compositions, and updraft velocities. The parametization error exceeds 10% only when the mode radius of the two size distributions differs by an order of magnitude. Errors for the mass fraction activated are always much less than errors for the number fraction activated. C1 Texas A&I Univ, Dept Mech Engn, Kingsville, TX 78363 USA. Pacific NW Natl Lab, Atmospher Sci & Global Change Dept, Richland, WA 99352 USA. RP Abdul-Razzak, H (reprint author), Texas A&I Univ, Dept Mech Engn, Kingsville, TX 78363 USA. EM H-Abdul-Razzak@tamuk.edu; steve.ghan@pnl.gov RI Ghan, Steven/H-4301-2011 OI Ghan, Steven/0000-0001-8355-8699 NR 27 TC 301 Z9 307 U1 1 U2 36 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 16 PY 2000 VL 105 IS D5 BP 6837 EP 6844 DI 10.1029/1999JD901161 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 294KT UT WOS:000085911000018 ER PT J AU Wang, LS Wang, XB AF Wang, LS Wang, XB TI Probing free multiply charged anions using photodetachment photoelectron spectroscopy SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Review ID ELECTROSPRAY MASS-SPECTROMETRY; NEGATIVE MOLECULAR-IONS; GAS-PHASE; CLUSTER IONS; VIBRATIONAL SPECTROSCOPY; CONSTRUCTION PRINCIPLE; IONIZATION-POTENTIALS; COULOMBIC ENERGY; CARBON CLUSTERS; BONDING TRENDS AB Multiply charged anions are common in the condensed phase, and their existence has been generally taken for granted. But until very recently, these species have only rarely been observed in the gas phase. A new experimental technique, using photodetachment photoelectron spectroscopy, electrospray, and ion-trap mass spectrometry, has been developed in the author's laboratory to probe multiply charged anions in the gas phase. In this article, the principles of this technique and some of the initial results will be presented and discussed. The difference between photodetachment of singly and multiply charged anions is emphasized. Photodetachment photoelectron spectroscopy is ideal to probe the chemical and physical properties of free multiply charged anions. Among the initial findings, the repulsive Coulomb barriers existing in multiply charged anions have been directly observed. The relationship between the intramolecular electron-electron repulsion and the potential barrier is elucidated, culminating in the first observation of a negative electron binding energy in a quadruply charged anion. Electron tunneling effects through the repulsive Coulomb barriers are also observed and interpreted using a model Coulomb potential and the theory developed to understand a-decay in nuclear physics. We show that the electrospray technique provides a unique means that allow solution phase species and chemistry to be investigated in the gas phase with molecular details and specificity but without the complication of the condensed phase environments. C1 Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Nalt Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Wang, LS (reprint author), Washington State Univ, Dept Phys, 2710 Univ Dr, Richland, WA 99352 USA. NR 132 TC 152 Z9 152 U1 3 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 16 PY 2000 VL 104 IS 10 BP 1978 EP 1990 DI 10.1021/jp9940093 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 294GD UT WOS:000085902700003 ER PT J AU Choi, H Bise, RT Hoops, AA Mordaunt, DH Neumark, DM AF Choi, H Bise, RT Hoops, AA Mordaunt, DH Neumark, DM TI Photodissociation of linear carbon clusters C-n (n=4-6) SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID ELECTRONIC ABSORPTION-SPECTRA; MULTIREFERENCE CONFIGURATION-INTERACTION; THRESHOLD PHOTODETACHMENT SPECTROSCOPY; SPECTROMETRIC EQUILIBRIUM MEASUREMENTS; NEON MATRICES; DISSOCIATION-ENERGIES; MOLECULAR-STRUCTURE; NEUTRAL FRAGMENT; INFRARED-SPECTRA; GAS-PHASE AB The photodissociation of mass-selected linear carbon clusters (C-n, n = 4-6) is studied using fast beam photofragment translational spectroscopy. The photofragment yield (PFY) spectra consist of several continua spanning the whole visible and ultraviolet region. The product mass distributions for dissociation of C-n clusters are dominated by C-3 and its partner fragment Cn-3, although some minor channels are also identified for dissociation of C-4 and C-5 clusters. Translational energy P(E-T) distributions for the C-3 + Cn-3 channel were measured at several photolysis energies. The PFY spectra and P(E-T) distributions indicate that multiphoton dissociation occurs at photon energies below the dissociation threshold and that both single-photon and multiphoton dissociation occur above the threshold. The one-photon components of the P(E-T) distributions can be modeled by phase space theory (PST), suggesting that photoexcitation is followed by internal conversion to the ground state. The PST analysis yields dissociation energies for C-n,--> C-3 + Cn-3 in reasonable agreement with recent Knudsen effusion mass spectrometry measurements. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Neumark, DM (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 58 TC 30 Z9 30 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 16 PY 2000 VL 104 IS 10 BP 2025 EP 2032 DI 10.1021/jp993768i PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 294GD UT WOS:000085902700009 ER PT J AU Miller, JA Klippenstein, SJ AF Miller, JA Klippenstein, SJ TI Theoretical considerations in the NH2+NOreaction SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID PRODUCT BRANCHING RATIO; TOTAL RATE-CONSTANT; NH2+NO REACTION; TRANSITION-STATES; VIBRATIONAL FREQUENCIES; THERMAL DENOX; NITRIC-OXIDE; NO; TEMPERATURE; SURFACE AB We have studied the NH2 + NO reaction theoretically in order to try to deduce a theoretical "model" that will accurately reproduce both the total rate coefficient k(T)(T) and the branching fraction alpha(T) of the reaction NH2 + NO --> N-2 + H2O (a), NH2 + NO --> NNH + OH (b), and NH2 + NO --> N2O + H-2 (c), where k(T) = k(a) + k(b) + k(c) and alpha = k(b)/k(T). The analysis, which makes the RRKM assumption and utilizes conventional transition-state theory for the internal-rearrangement transition stales and microcanconical/fixed-J variational transition-state theory for the bond fissions, is discussed at length. The results of the analysis show clearly that k(T)(T) is determined almost exclusively by the transition state for the 1,3 hydrogen transfer connecting the initial NH2NO complex to HNNOH. The branching fraction is sensitive to several features of the potential energy surface, most of them associated with the fragmentation of the various HNNOH complexes into NNH + OH. By adjusting properties of the potential energy surface, we have constructed a theoretical model that predicts results for both k(T)(T) and alpha(T) that are in good agreement with experiment. A variety of sensitivity analyses for the branching fraction indicate that reaction b is most likely thermoneutral to within +/-1 kcal/ mel. Our prediction of k(c)(T) is between 2 and 3 orders of magnitude smaller than values deduced from experiment, suggesting that the experiment may have detected the existence of a fourth channel, HNNO + H, or may have been contaminated by secondary reactions. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA. RP Miller, JA (reprint author), Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. OI Klippenstein, Stephen/0000-0001-6297-9187 NR 51 TC 55 Z9 55 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 16 PY 2000 VL 104 IS 10 BP 2061 EP 2069 DI 10.1021/jp992836y PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 294GD UT WOS:000085902700014 ER PT J AU Decker, JF AF Decker, JF TI DoE still involved in the Human Genome Project SO NATURE LA English DT Letter C1 US DOE, Off Sci, Washington, DC 20585 USA. RP Decker, JF (reprint author), US DOE, Off Sci, Washington, DC 20585 USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 16 PY 2000 VL 404 IS 6775 BP 222 EP 222 DI 10.1038/35005270 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296JX UT WOS:000086022200018 PM 10749187 ER PT J AU Kitamura, H Tsuneyuki, S Ogitsu, T Miyake, T AF Kitamura, H Tsuneyuki, S Ogitsu, T Miyake, T TI Quantum distribution of protons in solid molecular hydrogen at megabar pressures SO NATURE LA English DT Article ID DENSE HYDROGEN; DYNAMICS; EFFICIENT AB Solid hydrogen, a simple system consisting only of protons and electrons, exhibits a variety of structural phase transitions at high pressures. Experimental studies' based on static compression up to about 230 GPa revealed three relevant phases of solid molecular hydrogen: phase I (high-temperature, low-pressure phase), phase II (low-temperature phase) and phase III (high-pressure phase). Spectroscopic data suggest that symmetry breaking; possibly related to orientational ordering(1,2), accompanies the transition into phases II and III. The boundaries dividing the three phases exhibit a strong isotope effect(3), indicating that the quantum-mechanical properties of hydrogen nuclei are important. Here we report the quantum distributions of protons in the three phases of solid hydrogen, obtained by a first-principles path-integral molecular dynamics method. We show that quantum fluctuations of protons effectively hinder molecular rotation-that is, a quantum localization occurs. The obtained crystal structures have entirely different symmetries from those predicted by the conventional simulations which treat protons classically. C1 Univ Tokyo, Inst Solid State Phys, Tokyo 1068666, Japan. Rice Univ, Dept Space Phys & Astron, Houston, TX 77251 USA. Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA. Univ Illinois, Natl Ctr Supercomp Applicat, Urbana, IL 61801 USA. Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan. RP Tsuneyuki, S (reprint author), Univ Tokyo, Inst Solid State Phys, Tokyo 1068666, Japan. NR 24 TC 78 Z9 79 U1 0 U2 10 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 16 PY 2000 VL 404 IS 6775 BP 259 EP 262 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 296JX UT WOS:000086022200040 ER PT J AU Daugas, JM Grzywacz, R Lewitowicz, M Achouri, L Angelique, JC Baiborodin, D Bennaceur, K Bentida, R Beraud, R Borcea, C Bingham, C Catford, WN Emsallem, A de France, G Grawe, H Jones, KL Lemmon, RC Jimenez, MJL Nowacki, F Santos, FD Pfutzner, M Regan, PH Rykaczewski, K Sauvestre, JE Sawicka, M Sletten, G Stanoiu, M AF Daugas, JM Grzywacz, R Lewitowicz, M Achouri, L Angelique, JC Baiborodin, D Bennaceur, K Bentida, R Beraud, R Borcea, C Bingham, C Catford, WN Emsallem, A de France, G Grawe, H Jones, KL Lemmon, RC Jimenez, MJL Nowacki, F Santos, FD Pfutzner, M Regan, PH Rykaczewski, K Sauvestre, JE Sawicka, M Sletten, G Stanoiu, M TI The 8(+) isomer in Zn-78 and the doubly magic character of Ni-78 SO PHYSICS LETTERS B LA English DT Article ID SHELL-MODEL; NUCLEUS; SN-100(50)50; SPECTRUM; ISOTOPES AB A new isomeric state in Zn-78 has been identified and studied in the fragmentation of a 60.5 AMeV Kr-86 beam on a Ni-nat target. The measured energies of the transitions and the half-life, T-1/2 = 319(9) ns, of the isomeric decay suggest a spin and parity assignment I-pi = 8(+). The deduced B(E2,8(+) --> 6(+)) value equals 1.21(5) W.u. is well reproduced in large scale shell model calculations using realistic interactions in the proton-neutron 2p(3/2), 1f(5/2) 2p(1/2), 1g(9/2) model space. Standard E2 polarisation charges of 0.5e for both protons and neutrons were used. This result consists the first experimental evidence of the persistance of the N = 50 shell gap in the 78 vicinity of Ni-78(28)50. (C) 2000 Elsevier Science B.V. All rights reserved. C1 GANIL, F-14076 Caen 5, France. Univ Tennessee, Knoxville, TN 37996 USA. Univ Warsaw, IFD, PL-00681 Warsaw, Poland. LPC, F-14021 Caen, France. Acad Sci Czech Republic, Inst Nucl Phys, CZ-25068 Rez, Czech Republic. Inst Phys Nucl, F-69622 Villeurbanne, France. IAP, Bucharest, Romania. Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. GSI Darmstadt, D-64220 Darmstadt, Germany. Univ Strasbourg, LPT, F-67084 Strasbourg, France. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. CEA Bruyeres Le Chatel, F-91680 Bruyeres Le Chatel, France. Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark. RP GANIL, BP 5027, F-14076 Caen 5, France. RI sauvestre, jean-etienne/C-8819-2009; Jones, Katherine/B-8487-2011; Bennaceur, Karim/O-1680-2016 OI Jones, Katherine/0000-0001-7335-1379; Bennaceur, Karim/0000-0002-6722-491X NR 16 TC 73 Z9 74 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD MAR 16 PY 2000 VL 476 IS 3-4 BP 213 EP 218 DI 10.1016/S0370-2693(00)00177-5 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 294QW UT WOS:000085922700002 ER PT J AU Kuhlmann, S Huston, J Morfin, J Olness, F Pumplin, J Owens, JF Tung, WK Whitmore, JJ AF Kuhlmann, S Huston, J Morfin, J Olness, F Pumplin, J Owens, JF Tung, WK Whitmore, JJ TI Large-x parton distributions SO PHYSICS LETTERS B LA English DT Article ID DEUTERON STRUCTURE FUNCTIONS; GLUON DISTRIBUTION; GLOBAL ANALYSIS; SCATTERING; PROTON; RATIO AB Reliable knowledge of parton distributions at large x is crucial for many searches for new physics signals in the next generation of collider experiments. Although these are generally well determined in the small and medium x range, it has been shown that their uncertainty grows rapidly for x > 0.1. We examine the status of the gluon and quark distributions in light of new questions that have been raised in the past two years about "large-x" parton distributions, as well as recent measurements which have improved the parton uncertainties. We perform several specific global fits to answer the outstanding questions, and to investigate the potential of future experiments, particularly at HERA, which may provide critical constraints on parton distributions at large x. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Florida State Univ, Tallahassee, FL 32306 USA. Michigan State Univ, E Lansing, MI 48824 USA. Penn State Univ, University Pk, PA 16802 USA. So Methodist Univ, Dallas, TX 75275 USA. RP Kuhlmann, S (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 29 TC 30 Z9 30 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 16 PY 2000 VL 476 IS 3-4 BP 291 EP 296 DI 10.1016/S0370-2693(00)00164-7 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 294QW UT WOS:000085922700011 ER PT J AU Mahlon, G Parke, S AF Mahlon, G Parke, S TI Single top quark production at the LHC: Understanding spin SO PHYSICS LETTERS B LA English DT Article ID W-GLUON FUSION; PAIR PRODUCTION; HEAVY QUARKS; HADRON COLLIDERS; APPROXIMATION; TEVATRON; DECAY AB We show that the single top quarks produced in the Wg-fusion channel at a proton-proton collider at a center-of-mass energy root s = 14 TeV posses a high degree of polarization in terms of a spin basis which decomposes the top quark spin in its rest frame along the direction of the spectator jet. A second useful spin basis is the eta-beamline basis, which decomposes the top quark spin along one of the two beam directions, depending on which hemisphere contains the spectator jet. We elucidate the interplay between the two- and three-body final states contributing to this production cross section in the context of determining the spin decomposition of the top quarks, and argue that the zero momentum frame helicity is undefined. We show that the usefulness of the spectator and eta-beamline spin bases is not adversely affected by the cuts required to separate the Wg-fusion signal from the background. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada. Fermi Natl Accelerator Lab, Dept Phys Theor, Batavia, IL 60510 USA. Stanford Linear Accelerator Ctr, Theory Grp, Stanford, CA 94305 USA. RP Mahlon, G (reprint author), McGill Univ, Dept Phys, 3600 Univ St, Montreal, PQ H3A 2T8, Canada. NR 28 TC 55 Z9 55 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 16 PY 2000 VL 476 IS 3-4 BP 323 EP 330 DI 10.1016/S0370-2693(00)00149-0 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 294QW UT WOS:000085922700016 ER PT J AU Lin, ZW Wang, XN AF Lin, ZW Wang, XN TI Enhancement of intermediate mass dilepton from charm decays at SPS energies (vol 444, pg 245, 1998) SO PHYSICS LETTERS B LA English DT Correction C1 Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA. LBNL, Nucl Sci Div, Berkeley, CA 94720 USA. RP Lin, ZW (reprint author), Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 16 PY 2000 VL 476 IS 3-4 BP 488 EP 488 PG 1 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 294QW UT WOS:000085922700039 ER PT J AU Goodlett, DR Bruce, JE Anderson, GA Rist, B Pasa-Tolic, L Fiehn, O Smith, RD Aebersold, R AF Goodlett, DR Bruce, JE Anderson, GA Rist, B Pasa-Tolic, L Fiehn, O Smith, RD Aebersold, R TI Protein identification with a single accurate mass of a cysteine-containing peptide and constrained database searching SO ANALYTICAL CHEMISTRY LA English DT Article ID SEQUENCE DATABASES; SPECTROMETRY; ELECTROPHORESIS; GELS AB A method for rapid and unambiguous identification of proteins by sequence database searching using the accurate mass of a single peptide and specific sequence constraints is described. Peptide masses were measured using electrospray ionization-Fourier transform ion cyclotron resonance mass spectrometry to an accuracy of 1 ppm. The presence of a cysteine residue within a peptide sequence was used as a database searching constraint to reduce the number of potential database hits. Cysteine-containing peptides were detected within a mixture of peptides by incorporating chlorine into a general alkylating reagent specific for cysteine residues. Secondary search constraints included the specificity of the protease used for protein digestion and the molecular mass of the protein estimated by gel electrophoresis. The natural isotopic distribution of chlorine encoded the cysteine-containing peptide with a distinctive isotopic pattern that allowed automatic screening of mass spectra. The method is demonstrated for a peptide standard and unknown proteins from a yeast lysate using all 6118 possible yeast open reading frames as a database. As judged by calculation of codon bias, low-abundance proteins were identified from the yeast lysate using this new method but not by traditional methods such as tandem mass spectrometry via data-dependent acquisition or mass mapping. C1 Univ Washington, Dept Mol Biotechnol, Seattle, WA 98195 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Max Planck Inst Mol Plant Physiol, Potsdam, Germany. Merck Res Labs, W Point, PA 19486 USA. RP Goodlett, DR (reprint author), Univ Washington, Dept Mol Biotechnol, Hlth Sci Bldg K327,Box 357730, Seattle, WA 98195 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NINDS NIH HHS [NS39617] NR 33 TC 120 Z9 121 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 MAR 15 PY 2000 VL 72 IS 6 BP 1112 EP 1118 DI 10.1021/ac9913210 PG 7 WC Chemistry, Analytical SC Chemistry GA 295NR UT WOS:000085975200002 PM 10740847 ER PT J AU Chen, X Smith, LM Bradbury, EM AF Chen, X Smith, LM Bradbury, EM TI Site-specific mass tagging with stable isotopes in proteins for accurate and efficient protein identification SO ANALYTICAL CHEMISTRY LA English DT Article ID ASSISTED-LASER-DESORPTION/IONIZATION; DESORPTION IONIZATION; DELAYED EXTRACTION; MALDI-MS; ION-TRAP; SPECTROMETRY; PEPTIDE AB Proteolytic peptide mass mapping as measured by mass spectrometry provides a major approach for the identification of proteins. A protein is usually identified by the best match between the measured and calculated m/z values of the proteolytic peptides. A unique identification is, however, heavily dependent upon the mass accuracy and sequence coverage of the fragment ions generated by peptide ionization, Without ultrahigh instrumental accuracy, it is possible to increase the specificity of the assignments of particular proteolytic peptides by the incorporation of selected amino acid residue(s) enriched with stable isotope(s) into the protein sequence. Here we report this novel method of generating residue-specific mass-tagged proteolytic peptides for accurate and efficient protein identification. Selected amino acids are labeled with C-13/N-15/H-2 and incorporated into proteins in a sequence-specific manner during cell culturing. Each of these labeled amino acids carries a defined mass change encoded in its monoisotopic distribution pattern. Through their characteristic patterns, the peptides with mass tags can then be readily distinguished from other peptides in mass spectra. This method. of identifying unique proteins can also be;extended to protein complexes and will significantly increase data search specificity, efficiency, and accuracy for protein identifications. C1 Univ Calif Los Alamos Natl Lab, Div Biosci, Div Chem Sci & Technol, Los Alamos, NM 87544 USA. Univ Wisconsin, Dept Chem, Madison, WI 53706 USA. Univ Calif Davis, Sch Med, Dept Biol Chem, Davis, CA 95616 USA. RP Chen, X (reprint author), Univ Calif Los Alamos Natl Lab, Div Biosci, Div Chem Sci & Technol, CST-9,BN-2, Los Alamos, NM 87544 USA. NR 34 TC 111 Z9 119 U1 1 U2 10 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 MAR 15 PY 2000 VL 72 IS 6 BP 1134 EP 1143 DI 10.1021/ac9911600 PG 10 WC Chemistry, Analytical SC Chemistry GA 295NR UT WOS:000085975200005 PM 10740850 ER PT J AU Jarman, KH Cebula, ST Saenz, AJ Petersen, CE Valentine, NB Kingsley, MT Wahl, KL AF Jarman, KH Cebula, ST Saenz, AJ Petersen, CE Valentine, NB Kingsley, MT Wahl, KL TI An algorithm for automated bacterial identification using matrix-assisted laser desorption/ionization mass spectrometry SO ANALYTICAL CHEMISTRY LA English DT Article ID RAPID IDENTIFICATION; WHOLE CELLS; E-COLI; MICROORGANISMS; PROTEINS; PATTERNS AB An algorithm for bacterial identification using matrix, assisted laser desorption/ionization (MALDI) mass spectrometry is being developed. This mass spectral fingerprint comparison algorithm is fully automated and statistically based, providing objective analysis of samples to be identified. Based on extraction of reference fingerprint ions from test spectra, this approach should lend itself well to real-world applications where samples are likely to be impure. This algorithm is illustrated using a blind study. In the study, MALDI-MS fingerprints for Bacillus atrophaeus ATCC 49337, Bacillus cereus ATCC 14579(T), Escherichia coli ATCC 33694, Pantoea agglomerans ATCC 33243, and Pseudomonas putida F1 are collected and form a reference library. The identification of test samples containing one or more reference bacteria, potentially mixed with one species not in the library (Shewanella alga BrY), is performed by com parison to the reference library with a calculated degree of association. Out of 60 samples, no false positives are present, and the correct identification rate is 75%, Missed identifications are largely due to a weak B. cereus signal in the bacterial mixtures. Potential modifications to the algorithm are presented and result in a higher than 90% correct identification rate for the blind study data, suggesting that this approach has the potential for reliable and accurate automated data analysis of MALDI-MS. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Jarman, KH (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 25 TC 149 Z9 152 U1 2 U2 11 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 MAR 15 PY 2000 VL 72 IS 6 BP 1217 EP 1223 DI 10.1021/ac990832j PG 7 WC Chemistry, Analytical SC Chemistry GA 295NR UT WOS:000085975200017 PM 10740862 ER PT J AU Soughayer, JS Krasieva, T Jacobson, SC Ramsey, JM Tromberg, BJ Allbritton, NL AF Soughayer, JS Krasieva, T Jacobson, SC Ramsey, JM Tromberg, BJ Allbritton, NL TI Characterization of cellular optoporation with distance SO ANALYTICAL CHEMISTRY LA English DT Article ID GENE-TRANSFER; CULTURED-CELLS; STRESS WAVES; LASER; ELECTROPORATION; MEMBRANES; PERMEABILIZATION; DNA AB We have developed and characterized cellular optoporation with visible wavelengths of light using standard uncoated glass cover slips as the absorptive media. A frequency-doubled Nd:YAG laser pulse was focused at the interface of the glass surface and aqueous buffer, creating a stress wave and transiently permeabilizing nearby cells. Following optoporation of adherent cells, three spatial zones were present which were distinguished by the viability of the cells and the loading efficiency (or number of extracellular molecules loaded). The loading efficiency also depended on the concentration of the extracellular molecules and the molecular weight of the molecules. In the zone farthest from the laser beam (>60 mu m under these conditions), nearly all cells were both successfully loaded and viable. To illustrate the wider applicability of this optoporation method, cells were loaded with a substrate for protein kinase C and the cellular contents then analyzed by capillary electrophoresis. In contrast to peptides loaded by microinjection, optoporated peptide showed little proteolytic degradation, suggesting that the cells were minimally perturbed. Also demonstrating the potential for future work, cells were optoporated and loaded with a fluorophore in the enclosed channels of microfluidic devices. C1 Univ Calif Irvine, Dept Physiol & Biophys, Irvine, CA 92697 USA. Univ Calif Irvine, Beckman Laser Inst, Irvine, CA 92697 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Allbritton, NL (reprint author), Univ Calif Irvine, Dept Physiol & Biophys, Irvine, CA 92697 USA. FU NCI NIH HHS [R01CA78858]; NCRR NIH HHS [RR01192-18] NR 30 TC 75 Z9 77 U1 0 U2 10 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 MAR 15 PY 2000 VL 72 IS 6 BP 1342 EP 1347 DI 10.1021/ac990982u PG 6 WC Chemistry, Analytical SC Chemistry GA 295NR UT WOS:000085975200035 PM 10740880 ER PT J AU Zangar, RC Benson, JM Burnett, VL Springer, DL AF Zangar, RC Benson, JM Burnett, VL Springer, DL TI Cytochrome P450 2E1 is the primary enzyme responsible for low-dose carbon tetrachloride metabolism in human liver microsomes SO CHEMICO-BIOLOGICAL INTERACTIONS LA English DT Article DE CYP2E1; carbon tetrachloride; liver; human; trichloromethyl radical ID PHARMACOKINETIC MODEL; EXPRESSION; INDUCTION; RAT AB We examined which human CYP450 forms contribute to carbon tetrachloride (CCl4) bioactivation using hepatic microsomes, heterologously expressed enzymes, inhibitory antibodies and selective chemical inhibitors. CCl4, metabolism was determined by measuring chloroform formation under anaerobic conditions. Pooled human microsomes metabolized CCl4 with a K-m of 57 mu M and a V-max of 2.3 nmol CHCl3/min/mg protein. Expressed CYP2E1 metabolized CCl4 with a K-m of 1.9 mu M and a V-max of 8.9 nmol CHCl3/min/nmol CYP2E1. At 17 mu M CCl4, a monoclonal CYP2E1 antibody inhibited 64, 74 and 83% of the total CCl4 metabolism in three separate human microsomal samples, indicating that at low CCl4 concentrations, CYP2E1 was the primary enzyme responsible for CCl4 metabolism. At 530 mu M CCl4, anti-CYP2E1 inhibited 36, 51 and 75% of the total CCl4 metabolism, suggesting that other CYP450s may have a significant role in CCl4, metabolism at this concentration. Tests with expressed CYP2B6 and inhibitory CYP2B6 antibodies suggested that this form did not contribute significantly to CCl4 metabolism. Effects of the CYP450 inhibitors alpha-naphthoflavone (CYP1A), sulfaphenazole (CYP2C9) and clotrimazole (CYP3A) were examined in the liver microsome sample that was inhibited only 36% by anti-CYP2E1 at 530 mu M CCl4. Clotrimazole inhibited CCl4 metabolism by 23% but the other chemical inhibitors were without significant effect. Overall, these data suggest that CYP2E1 is the major human enzyme responsible for CCl4 bioactivation at lower, environmentally relevant levels. At higher CCl4 levels. CYP3A and possibly other CYP450 forms may contribute to CCl4 metabolism. (C) 2000 Published by Elsevier Science Ireland Ltd. All rights reserved. C1 Pacific NW Lab, Mol Biosci Dept, Richland, WA 99352 USA. Lovelace Resp Res Inst, Albuquerque, NM USA. RP Pacific NW Lab, Mol Biosci Dept, POB 999,P7-56, Richland, WA 99352 USA. EM david.springer@pnl.gov NR 22 TC 64 Z9 71 U1 1 U2 9 PU ELSEVIER IRELAND LTD PI CLARE PA ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000, IRELAND SN 0009-2797 EI 1872-7786 J9 CHEM-BIOL INTERACT JI Chem.-Biol. Interact. PD MAR 15 PY 2000 VL 125 IS 3 BP 233 EP 243 DI 10.1016/S0009-2797(00)00149-6 PG 11 WC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology GA 304KC UT WOS:000086481700007 PM 10731522 ER PT J AU Frink, LJD van Swol, F AF Frink, LJD van Swol, F TI A common theoretical basis for surface forces apparatus, osmotic stress, and beam bending measurements of surface forces SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article DE surface forces apparatus; osmotic stress; seam bending measurements; pore morphology ID DENSITY-FUNCTIONAL THEORY; SOLVATION FORCES; HYDRATION FORCES; MICA SURFACES; MONTE-CARLO; BILAYERS; WATER; DEPLETION; ADHESION; LIQUIDS AB In the last two decades, several techniques for measuring the interactions of surfaces or macromolecules through a solvent phase have been developed. These methods include the surface forces apparatus, the osmotic stress device, and most recently a beam bending experiment. This paper summarizes a statistical mechanical framework that can be used to compare and contrast the different methods. We demonstrate that while the SFA provides an elegant direct measure of surface forces in a single ideal pore, the OS and BE methods provide unique in situ measurements of the solvation force. These in situ measurements provide information about self-assembly in solution (OS) and can be used to characterize pore morphology in microporous thin films (BB). (C) 2000 Elsevier Science B;V. All rights reserved. C1 Sandia Natl Labs, Mat Simulat Sci Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Theoret & Computat Mat Modeling Dept, Albuquerque, NM 87106 USA. Univ New Mexico, Dept Chem & Nucl Engn, Adv Mat Lab, Albuquerque, NM 87106 USA. RP Frink, LJD (reprint author), Sandia Natl Labs, Mat Simulat Sci Dept, POB 5800, Albuquerque, NM 87185 USA. NR 48 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD MAR 15 PY 2000 VL 162 IS 1-3 BP 25 EP 36 DI 10.1016/S0927-7757(99)00253-8 PG 12 WC Chemistry, Physical SC Chemistry GA 276DM UT WOS:000084860400003 ER PT J AU Hopke, PK Borak, TB Doull, J Cleaver, JE Eckerman, KF Gundersen, LCS Harley, NH Hess, CT Kinner, NE Kopecky, KJ McKone, TE Sextro, RG Simon, SL AF Hopke, PK Borak, TB Doull, J Cleaver, JE Eckerman, KF Gundersen, LCS Harley, NH Hess, CT Kinner, NE Kopecky, KJ McKone, TE Sextro, RG Simon, SL TI Health risks due to radon in drinking water SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID RN-222; HOMES AB Following more than a decade of scientific debate about the setting of a standard for Rn-222 in drinking water, Congress established a timetable for the promulgation of a standard in the 1996 Amendments to the Safe Drinking Water Act. As a result of those Amendments, the EPA contracted with the National Academy of Sciences to undertake a risk assessment for exposure to radon in drinking water. in addition, the resulting committee was asked to address several other scientific issues including the national average ambient Rn-222 concentration and the increment of Rn-222 to the indoor-air concentration arising from the use of drinking water in a home. A new dosimetric analysis of the cancer risk to the stomach from ingestion was performed. The recently reported risk estimates developed by the BEIR VI Committee for inhalation of radon decay products were adopted. Because the 1996 Amendments permit states to develop programs in which mitigation of air-producing health-risk reductions equivalent to that which would be achieved by treating the drinking water, the scientific issues involved in such "multimedia mitigation programs" were explored. C1 Clarkson Univ, Dept Chem, Potsdam, NY 13699 USA. Colorado State Univ, Dept Radiol Hlth Sci, Ft Collins, CO 80523 USA. Univ Kansas, Med Ctr, Kansas City, KS 66160 USA. Univ Calif San Francisco, Dept Dermatol, San Francisco, CA 94143 USA. Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. US Geol Survey, Mineral Resources Program, Reston, VA 20192 USA. NYU Med Ctr, Nelson Inst Environm Med, New York, NY 10016 USA. Univ Maine, Dept Phys, Orono, ME 04469 USA. Univ New Hampshire, Dept Civil Engn, Durham, NH 03824 USA. Fred Hutchinson Canc Res Ctr, Seattle, WA 98109 USA. Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. CNR, BRER, Washington, DC 20418 USA. RP Hopke, PK (reprint author), Clarkson Univ, Dept Chem, Potsdam, NY 13699 USA. EM hopkepk@clarkson.edu RI Hopke, Philip/C-6020-2008 OI Hopke, Philip/0000-0003-2367-9661 NR 30 TC 43 Z9 49 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X EI 1520-5851 J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD MAR 15 PY 2000 VL 34 IS 6 BP 921 EP 926 DI 10.1021/es9904134 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 293RR UT WOS:000085867400001 ER PT J AU Wang, WG Lyons, DW Clark, NN Gautam, M Norton, PM AF Wang, WG Lyons, DW Clark, NN Gautam, M Norton, PM TI Emissions from nine heavy trucks fueled by diesel and biodiesel blend without engine modification SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ESTER AB Biodiesel, a fuel that can be made from renewable biological sources such as vegetable oils or animal fats, has been recognized recently as an environment friendly alternative fuel for diesel engines. In this paper, we describe a study that compared exhaust emissions from in-use heavy trucks fueled with a biodiesel blend with those from trucks fueled with petroleum diesel. The biodiesel blend tested is a mixture of 35% biodiesel and 65% petroleum diesel, a blend designated as B35. The study is based on the field test results from West Virginia University's Transportable Heavy Duty Chassis Dynamometer Emissions Testing Laboratory and sponsored by the U.S. Department of Energy. The heavy trucks we tested performed well when the originally equipped compression-ignition engine (diesel engine) was fueled with B35 without any engine modifications. Fuel economy (in terms of gallon per mile) of the two fuels was about the same. The emissions test results have shown that the heavy trucks fueled by B35 emitted significantly lower particulate matter (PM) and moderately lower carbon monoxide (CO) and hydrocarbon (HC) than the same trucks fueled by no. 2 diesel (D2). Oxides of nitrogen (NOx) emissions from B35 and D2, however, were generally in the same level. Emissions variations from two different engine models and two driving cycles were also observed. Although we recommend more tests for biodiesel vehicles, the data obtained in this study indicate that biodiesel has promise as an emissions-reducing alternative fuel for diesel engines. C1 W Virginia Univ, Morgantown, WV 26506 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Wang, WG (reprint author), W Virginia Univ, Morgantown, WV 26506 USA. NR 39 TC 221 Z9 232 U1 2 U2 34 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 MAR 15 PY 2000 VL 34 IS 6 BP 933 EP 939 DI 10.1021/es981329b PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 293RR UT WOS:000085867400003 ER PT J AU Ressler, T Wong, J Roos, J Smith, IL AF Ressler, T Wong, J Roos, J Smith, IL TI Quantitative speciation of Mn-bearing particulates emitted from autos burning (methylcyclopentadienyl)manganese tricarbonyl-added gasolines using XANES spectroscopy SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID RAY-ABSORPTION-SPECTROSCOPY; FINE-STRUCTURE; EXAFS; ZDDP AB The chemical nature of Mn-containing particulates emitted from (methylcyclopentadienyl)manganese tricarbonyl-added gasoline engines has been elucidated using Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. Edge shift data from the X-ray absorption near-edge structure (XANES) spectra showed that the average Mn valence in these particulates is similar to 2.2. Using a principal component analysis (PCA) algorithm, the number and type of probable species contained in these particulates were determined to be three, consisting of Mn3O4, MnSO4. H2O, and a divalent manganese phosphate, Mn-5(PO4)[PO3(OH)](2). 4H(2)O. The proportions of these Mn phases in each particulate sample were evaluated quantitatively using least-squares fitting (LSF) of the experimental XANES spectra with linear combinations of these principal component (model compound) spectra. Two groups of Mn-bearing particulates may be distinguished: group I having 4-9 wt % of Mn3O4 and exhibiting a single intense first major absorption maximum at the Mn K-edge and group II containing 15-22 wt % of Mn3O4 and exhibiting a doublet absorption maximum at lower intensity. Fourier transforms of the EXAFS signals were found to corroborate the XANES results. This study clearly establishes XANES spectroscopy, in combination with PCA and LSF, as a quantitative analytical tool for speciation of dilute and/or amorphous multicomponent environmental materials not easily attainable with conventional methods. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Max Planck Soc, Fritz Haber Inst, Dept Inorgan Chem, D-14195 Berlin, Germany. Ethyl Corp, Ctr Res & Dev, Richmond, VA 23217 USA. RP Wong, J (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. NR 33 TC 244 Z9 246 U1 8 U2 72 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 MAR 15 PY 2000 VL 34 IS 6 BP 950 EP 958 DI 10.1021/es990787x PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 293RR UT WOS:000085867400005 ER PT J AU Gu, BH Brown, GM Bonnesen, PV Liang, LY Moyer, BA Ober, R Alexandratos, SD AF Gu, BH Brown, GM Bonnesen, PV Liang, LY Moyer, BA Ober, R Alexandratos, SD TI Development of novel bifunctional anion exchange resins with improved selectivity for pertechnetate sorption from contaminated groundwater SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID BEHAVIOR; TC-99; ION AB The present study evaluated a new class of bifunctional anion-exchange resins with improved selectivity and sorption kinetics for removing pertechnetate (TcO4-) from contaminated groundwater. Both laboratory-column and field flow-through experiments were performed, and results indicated that superior performance of the bifunctional resins has been achieved through the use of two quaternary ammonium groups,;one having long chains (trihexylamine) for higher selectivity for poorly hydrated large anions and one having shorter chains (triethylamine) for enhanced kinetics and exchange capacity. Field results indicated that the bifunctional resin performed similar to 5 times better than one of the best commercial monofunctional anion-exchange resins (e.g., Purolite A-520E) with respect to the removal of TcO4- from contaminated groundwater, Less than 3% of TcO4- breakthrough was observed after similar to 700 000 bed volumes (BV) of contaminated groundwater had been treated by the bifunctional resin column (at a flow rate of similar to 6 BV/min) at the U.S. Department of Energy's Paducah Gaseous Diffusion Plant site. The results also demonstrate that the new resin is particularly effective in removing low revels of TcO4- (e.g., at nmol/L range), and a cost saving may be realized by using the bifunctional resins for the treatment of large quantities of contaminated groundwater because of its increased selectivity, treatment efficiency, and longevity. The new resin may also be applied for the efficient treatment of other poorly hydrated large anions such as perchlorate (ClO4-) from contaminated groundwater or surface water. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. RP Gu, BH (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. RI Solominow, Sonia/A-4021-2008; Gu, Baohua/B-9511-2012; Liang, Liyuan/O-7213-2014; Bonnesen, Peter/A-1889-2016; Moyer, Bruce/L-2744-2016 OI Gu, Baohua/0000-0002-7299-2956; Liang, Liyuan/0000-0003-1338-0324; Bonnesen, Peter/0000-0002-1397-8281; Moyer, Bruce/0000-0001-7484-6277 NR 23 TC 57 Z9 65 U1 2 U2 21 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 MAR 15 PY 2000 VL 34 IS 6 BP 1075 EP 1080 DI 10.1021/es990951g PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 293RR UT WOS:000085867400023 ER PT J AU Xu, WD Gong, LM Haddad, MM Bischof, O Campisi, J Yeh, ETH Medrano, EE AF Xu, WD Gong, LM Haddad, MM Bischof, O Campisi, J Yeh, ETH Medrano, EE TI Regulation of microphthalmia-associated transcription factor MITF protein levels by association with the ubiquitin-conjugating enzyme hUBC9 SO EXPERIMENTAL CELL RESEARCH LA English DT Article DE MITF; ubiquitin; SUMO; melanocytes; differentiation ID GTPASE-ACTIVATING PROTEIN; HUMAN HOMOLOG; KAPPA-B; SUMO-1 MODIFICATION; NEURAL CREST; GENE; UBC9; DEGRADATION; SYSTEM; PIGMENTATION AB The basic helix-loop-helix/leucine zipper (bHLH/ZIP) microphthalmia-associated transcription factor (MITF) regulates transcription of genes encoding enzymes essential for melanin biosynthesis in melanocytes and retinal pigmented epithelial cells. To determine how MITF activity is regulated, we used the yeast two-hybrid system to identify proteins expressed by human melanoma cells that interact with MITF, The majority of clones that showed positive interaction with a 158-amino-acid region of MITF containing the bHLH/ZIP domain (aa 168-325) encoded the ubiquitin conjugating enzyme hUBC9, The association of MITF with hUBC9 was further confirmed by an in vitro GST pull-down assay. Although hUBC9 is known to interact preferentially with SENTRIN/ SUMO1, in vitro transcription/translation analysis demonstrated greater association of MITF with ubiquitin than with SENTRIN, Importantly, cotransfection of MITF and hUBC9 expression vectors resulted in MITF protein degradation. MITF protein was stabilized by the proteasome inhibitor MG132, indicating the role of the ubiquitin-proteasome system in MITF degradation. Serine 73, which is located in a region rich in proline, glutamic acid, serine, and threonine (PEST), regulates MITF protein stability, since a serine to alanine mutation prevented hUBC9-mediated MITF (S73A) degradation. Furthermore, we identified lysine 201 as a potential ubiquitination site. A lysine to arginine mutation abolished MITF (K201R) degradation by hUBC9 in vivo, Our experiments indicate that by targeting MITF for proteasome degradation, hUBC9 is a critical regulator of melanocyte differentiation. (C) 2000 Academic Press. C1 Vet Affairs Med Ctr, Houston, TX 77030 USA. Baylor Coll Med, Dept Dermatol, Houston, TX 77030 USA. Baylor Coll Med, Dept Cell Biol, Houston, TX 77030 USA. Baylor Coll Med, Roy M & Phyllis Gough Huffington Ctr Aging, Houston, TX 77030 USA. Univ Texas, Houston Hlth Sci Ctr, Houston, TX 77030 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Cell & Mol Biol, Berkeley, CA 94720 USA. RP Medrano, EE (reprint author), Vet Affairs Med Ctr, REs Bldg 110,2002 Holcombe Blvd, Houston, TX 77030 USA. FU NIA NIH HHS [AG00594, AG09909, AG13663] NR 56 TC 148 Z9 150 U1 2 U2 8 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD MAR 15 PY 2000 VL 255 IS 2 BP 135 EP 143 DI 10.1006/excr.2000.4803 PG 9 WC Oncology; Cell Biology SC Oncology; Cell Biology GA 295UX UT WOS:000085987200001 PM 10694430 ER PT J AU De Lorenzo, A Andreoli, A Mohamed, EI Sorge, R Wielopolski, L Yasumura, S AF De Lorenzo, A Andreoli, A Mohamed, EI Sorge, R Wielopolski, L Yasumura, S TI Total body capacitance as a measuer of body cell mass. SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Roma Tor Vergata, Human Nutr Unit, I-00133 Rome, Italy. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 2000 VL 14 IS 4 BP A497 EP A497 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 294NV UT WOS:000085918102876 ER PT J AU Dueker, SR Lin, Y Buchholz, BA Vogel, JS Clifford, AJ AF Dueker, SR Lin, Y Buchholz, BA Vogel, JS Clifford, AJ TI beta-carotene and vitamin a bioavailability and long-term kinetics in a human determined by accelerator mass spectrometry SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. Univ Calif Davis, Dept Nutr, Davis, CA 95616 USA. RI Buchholz, Bruce/G-1356-2011 NR 0 TC 1 Z9 1 U1 0 U2 3 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 2000 VL 14 IS 4 BP A485 EP A485 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 294NV UT WOS:000085918102806 ER PT J AU Lin, Y Dueker, SR Bucholz, BA Follett, JR Vogel, JS Clifford, AJ AF Lin, Y Dueker, SR Bucholz, BA Follett, JR Vogel, JS Clifford, AJ TI Folic acid mass balance study in humans by accelerator mass spectromtry SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Davis, Dept Nutr, Davis, CA 95616 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 2000 VL 14 IS 4 BP A202 EP A202 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 294NV UT WOS:000085918101170 ER PT J AU Sen, CK Bagchi, D AF Sen, CK Bagchi, D TI Regulation of inducible VCAM-1 expression by grape seed proanthocyanidin extract SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Creighton Univ, Omaha, NE 68178 USA. Univ Kuopio, FIN-70211 Kuopio, Finland. RI Sen, Chandan/A-8762-2013 NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 2000 VL 14 IS 4 BP A695 EP A695 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 294NV UT WOS:000085918104023 ER PT J AU Sen, CK Khanna, S Roy, S Packer, L AF Sen, CK Khanna, S Roy, S Packer, L TI Vitamin E alpha-tocotrienol potently inhibits glutamate induced pp60c-Src kinase activation and death of HT4 neuronal cells SO FASEB JOURNAL LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. RI Sen, Chandan/A-8762-2013; Khanna, Savita/E-3378-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 2000 VL 14 IS 4 BP A554 EP A554 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA 294NV UT WOS:000085918103206 ER PT J AU Duffy, PB Bell, J Covey, C Sloan, L AF Duffy, PB Bell, J Covey, C Sloan, L CA CMIP investigators TI Effect of flux adjustments on temperature variability in climate models SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID REANALYSIS AB It has been suggested that "flux adjustments" in climate models suppress simulated temperature variability. If true, this might invalidate the conclusion that at least some of observed temperature increases since 1860 are anthropogenic, since this conclusion is based in part on estimates of natural temperature variability derived from flux-adjusted models. We assess variability of surface air temperatures in 17 simulations of internal temperature variability submitted to the Coupled Model Intercomparison Project. By comparing variability in flux-adjusted vs. non-flux adjusted simulations, we find no evidence that flux adjustments suppress temperature variability in climate modes, other, largely unknown, factors are much more important in determining simulated temperature variability. Therefore the conclusion that at least some of observed temperature increases are anthropogenic cannot be questioned on the grounds that it is based in part:on results of flux-adjusted models. Also, reducing dr eliminating flux adjustments would probably do little to improve simulations of temperature variability. C1 Univ Calif Lawrence Livermore Natl Lab, Div Atmospher Sci, Climate Syst Modeling Grp, Livermore, CA 94550 USA. Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA. RP Duffy, PB (reprint author), Univ Calif Lawrence Livermore Natl Lab, Div Atmospher Sci, Climate Syst Modeling Grp, L-103, Livermore, CA 94550 USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAR 15 PY 2000 VL 27 IS 6 BP 763 EP 766 DI 10.1029/1999GL002390 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 293TC UT WOS:000085868600007 ER PT J AU Sergeev, VA Sauvaud, JA Popescu, D Kovrazhkin, RA Liou, K Newell, PT Brittnacher, M Parks, G Nakamura, R Mukai, T Reeves, GD AF Sergeev, VA Sauvaud, JA Popescu, D Kovrazhkin, RA Liou, K Newell, PT Brittnacher, M Parks, G Nakamura, R Mukai, T Reeves, GD TI Multiple-spacecraft observation of a narrow transient plasma jet in the Earth's plasma sheet SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID BURSTY BULK FLOWS; HIGH-SPEED FLOWS; CONVECTION; MAGNETOTAIL AB We use observations from five magnetospheric spacecraft in a fortuitous constellation to show that narrow transient plasma flow jets of considerable length formed in the tail can intrude into the inner magnetosphere and provide considerable contribution to the total plasma transport. A specific auroral structure, the auroral streamer, accompanied the development of this narrow plasma jet. These observations support the 'boiling' plasma sheet model consisting of localized underpopulated plasma tubes (bubbles) moving Earthward at high speeds as a realistic way to resolve the 'convection crisis' and to close the global magnetospheric circulation pattern. C1 St Petersburg State Univ, St Petersburg 198904, Russia. Ctr Etud Spatiale Rayonnements, Toulouse, France. Space Res Inst, Moscow, Russia. Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. Univ Washington, Geophys Program, Seattle, WA 98195 USA. Max Planck Inst Extraterr Phys, D-37075 Garching, Germany. Inst Space & Astronaut Sci, Sagamihara, Kanagawa 229, Japan. Los Alamos Natl Lab, Los Alamos, NM USA. RP Sergeev, VA (reprint author), St Petersburg State Univ, St Petersburg 198904, Russia. EM sergeev1@snoopy.phys.spbu.ru RI Nakamura, Rumi/I-7712-2013; Reeves, Geoffrey/E-8101-2011; Sergeev, Victor/H-1173-2013; Liou, Kan/C-2089-2016 OI Nakamura, Rumi/0000-0002-2620-9211; Reeves, Geoffrey/0000-0002-7985-8098; Sergeev, Victor/0000-0002-4569-9631; Liou, Kan/0000-0001-5277-7688 NR 19 TC 121 Z9 123 U1 2 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAR 15 PY 2000 VL 27 IS 6 BP 851 EP 854 DI 10.1029/1999GL010729 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 293TC UT WOS:000085868600029 ER PT J AU Binning, RC Liao, MS Cabrera, CR Ishikawa, Y Iddir, H Liu, RX Smotkin, ES Aldykiewicz, AJ Myers, DJ AF Binning, RC Liao, MS Cabrera, CR Ishikawa, Y Iddir, H Liu, RX Smotkin, ES Aldykiewicz, AJ Myers, DJ TI Density functional calculations on CO attached to PtnRu(10-n) (n=6-10) clusters SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article DE density functional calculations; platinum; ruthenium; chemisorption ID RELATIVISTIC EFFECTIVE POTENTIALS; SPIN-ORBIT OPERATORS; ORGANIC-MOLECULES; CARBON-MONOXIDE; METHANOL ELECTROOXIDATION; VIBRATIONAL FREQUENCIES; FUEL-CELL; SURFACES; OXIDATION; PLATINUM AB B3LYP and SCF-X alpha calculations have been performed on PtnRu(10-n)CO (n = 6-10) clusters. The work aims to simulate the adsorption of CO on the (111) surface of platinum metal and to examine the electronic effects that arise when some Pt atoms are replaced with Ru. Adsorption energies and Pt-C and C-O stretching frequencies have been calculated for each cluster. Ru does affect the electronic structure of the clusters, the calculated adsorption energies, and frequencies, the Pt-C frequency more than the C-O. The donation-backbonding mechanism that accompanies the shift in CO stretching frequency that occurs when CO adsorbs on platinum does not explain the differences in frequency shift observed in CO on various Pt/Ru surfaces. (C) 2000 John Wiley & Sons, Inc. C1 Univ Puerto Rico, Dept Chem, Rio Piedras, PR 00931 USA. IIT, Dept Chem Engn, Chicago, IL 60616 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Ishikawa, Y (reprint author), Univ Puerto Rico, Dept Chem, POB 23346,UPR Stn, Rio Piedras, PR 00931 USA. NR 48 TC 8 Z9 8 U1 0 U2 5 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD MAR 15 PY 2000 VL 77 IS 2 BP 589 EP 598 PG 10 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA 286EZ UT WOS:000085431800011 ER PT J AU Blakely, EA McNamara, MP Chang, PY Bjornstad, KA AF Blakely, EA McNamara, MP Chang, PY Bjornstad, KA TI Radiation-induced changes in lens cell adhesion molecules. SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSOC RESEARCH VISION OPHTHALMOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 2000 VL 41 IS 4 SU S MA 4597B544 BP S865 EP S865 PG 1 WC Ophthalmology SC Ophthalmology GA 300HF UT WOS:000086246704666 ER PT J AU Meng, WJ Meletis, EI Rehn, LE Baldo, PM AF Meng, WJ Meletis, EI Rehn, LE Baldo, PM TI Inductively coupled plasma assisted deposition and mechanical properties of metal-free and Ti-containing hydrocarbon coatings SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HYDROGENATED CARBON-FILMS; THIN-FILMS AB Metal-free amorphous hydrocarbon (a-C:H) and Ti-containing hydrocarbon (Ti-C:H) coatings have been synthesized in a hybrid chemical vapor deposition (CVD)/physical vapor deposition (PVD) system which combines inductively coupled plasma (ICP) and sputter deposition. a-C:H coatings have been fabricated by ICP assisted CVD in inert/hydrocarbon gas mixtures while Ti-C:H coatings have been fabricated by ICP assisted magnetron sputtering of Ti in inert/hydrocarbon gas mixtures. We present results of structural characterization and mechanical property measurements on these a-C:H and Ti-C:H coatings. In particular, the influence of hydrogen on the coating mechanical properties is probed experimentally. We show that hydrogen significantly influences the mechanical properties of a-C:H and Ti-C:H coatings and needs to be considered for a full understanding of the mechanical properties of Ti-C:H coatings. Our results demonstrate that combining ICP with sputter deposition makes a versatile CVD/PVD tool capable of depositing metal-free and metal-containing hydrocarbon coatings with widely varying microstructures and mechanical properties. (C) 2000 American Institute of Physics. [S0021-8979(00)05406-2]. C1 Louisiana State Univ, Dept Mech Engn, Baton Rouge, LA 70808 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Meng, WJ (reprint author), Louisiana State Univ, Dept Mech Engn, Baton Rouge, LA 70808 USA. NR 23 TC 32 Z9 33 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2000 VL 87 IS 6 BP 2840 EP 2848 DI 10.1063/1.372266 PG 9 WC Physics, Applied SC Physics GA 287WY UT WOS:000085531400027 ER PT J AU Batlle, X Echer, CJ Nelson, EC Krishnan, KM Hattink, BJ AF Batlle, X Echer, CJ Nelson, EC Krishnan, KM Hattink, BJ TI Antiferromagnetic correlations in Fe-Cu granular alloys: The role of the surface structure SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GIANT MAGNETORESISTANCE; PARTICLES; SYSTEMS; MATRIX AB Fe precipitates in a Cu-fcc matrix, prepared using the Bridgeman method and with an average composition of Cu97Fe3, displayed the coexistence of ferromagnetism (FM), spin glass-like (SGL) behavior and antiferromagnetic (AFM) correlations. The two former contributions may be attributed, respectively, to the segregation of FM, alpha-Fe-bcc precipitates and to the few Fe spins distributed in the matrix. The annealing procedures increased the FM contribution and, as particle growth and phase segregation took place, the SGL behavior progressively disappeared. Results from high resolution transmission electron microscopy (HRTEM), x-ray photoelectron spectroscopy (XPS), and electron energy-loss spectroscopy (EELS) suggest that the AFM correlations are due to the alpha-Fe particles that show a surface layer of a few nanometers in thickness, of either FeO and/or gamma-Fe-fcc. XPS and EELS measurements confirm the presence of FeO; however, the latter is only tentatively suggested by the HRTEM analysis of the particle/matrix interfaces. (C) 2000 American Institute of Physics. [S0021-8979(00)08106-8]. C1 Univ Barcelona, Fac Fis, Dept Fis Fonamental, E-08028 Barcelona, Catalonia, Spain. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. RP Batlle, X (reprint author), Univ Barcelona, Fac Fis, Dept Fis Fonamental, Diagonal 647, E-08028 Barcelona, Catalonia, Spain. RI Batlle, Xavier/H-5795-2012 NR 14 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2000 VL 87 IS 6 BP 3037 EP 3043 DI 10.1063/1.372296 PG 7 WC Physics, Applied SC Physics GA 287WY UT WOS:000085531400058 ER PT J AU Sigalas, MM Garcia, N AF Sigalas, MM Garcia, N TI Theoretical study of three dimensional elastic band gaps with the finite-difference time-domain method SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHOTONIC CRYSTAL; DEFECT STATES; WAVES; COMPOSITES AB This work presents results on finite-difference time-domain (FDTD) integration of the full three dimensional elastic wave equation in nonhomogenous periodic media, for understanding the propagation and gap existence in these media. Extensive calculations are compared with plane wave expansion (PWE) data for different three dimensional systems consisting of Pb spheres in epoxy matrix forming an fcc lattice. The method of solving the wave equation provides good convergence and the agreement with the PWE method is excellent. The FDTD method, however, can handle cases such as fluids in solids which cannot be treated with the PWE method. Transmission results are presented for the case of Hg spheres in Al with fcc lattice, in order to prove the general use of the FDTD method. (C) 2000 American Institute of Physics. [S0021-8979(00)05706-6]. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. CSIC, Lab Fis Sistemas Pequenos & Nanotecnol, E-28006 Madrid, Spain. RP Sigalas, MM (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. NR 29 TC 143 Z9 155 U1 1 U2 22 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2000 VL 87 IS 6 BP 3122 EP 3125 DI 10.1063/1.372308 PG 4 WC Physics, Applied SC Physics GA 287WY UT WOS:000085531400071 ER PT J AU Niederberger, S Gracias, DH Komvopoulos, K Somorjai, GA AF Niederberger, S Gracias, DH Komvopoulos, K Somorjai, GA TI Transitions from nanoscale to microscale dynamic friction mechanisms on polyethylene and silicon surfaces SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ATOMIC-FORCE MICROSCOPY; DEPENDENCE; WEAR AB The dynamic friction mechanisms of polyethylene and silicon were investigated for apparent contact pressures and contact areas in the ranges of 8 MPa-18 GPa and 17 nm(2)-9500 mu m(2), respectively. Friction force measurements were obtained with a friction force microscope, scanning force microscope, and pin-on-disk tribometer. Silicon and diamond tips with a nominal radius of curvature between 100 nm and 1.2 mm were slid against low- and high-density polyethylene and Si(100) substrates under contact loads in the range of 5 nN-0.27 N. The low friction coefficients obtained with all material systems at low contact pressures indicated that deformation at the sliding interface was primarily elastic. Alternatively, the significantly higher friction coefficients at higher contact pressures suggested that plastic deformation was the principal mode of deformation. The high friction coefficients of polyethylene observed with large apparent contact areas are interpreted in terms of the microstructure evolution involving the rearrangement of crystalline regions (lamellae) nearly parallel to the sliding direction, which reduces the surface resistance to plastic shearing. Such differences in the friction behavior of polyethylene resulting from stress-induced microstructural changes were found to occur over a relatively large range of the apparent contact area. The friction behavior of silicon was strongly affected by the presence of a native oxide film. Results are presented to demonstrate the effect of the scale of deformation at the contact interface on the dynamic friction behavior and the significance of contact parameters on the friction measurements obtained with different instruments. (C) 2000 American Institute of Physics. [S0021-8979(00)06305-2]. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. RP Niederberger, S (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Gracias, David/A-1942-2010 OI Gracias, David/0000-0003-2735-4725 NR 20 TC 26 Z9 26 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 2000 VL 87 IS 6 BP 3143 EP 3150 DI 10.1063/1.372312 PG 8 WC Physics, Applied SC Physics GA 287WY UT WOS:000085531400075 ER PT J AU Klos, J Chalasinski, G Berry, MT Kendall, RA Burcl, R Szczesniak, MM Cybulski, SM AF Klos, J Chalasinski, G Berry, MT Kendall, RA Burcl, R Szczesniak, MM Cybulski, SM TI Ab initio potential energy surface for the Ar(S-1) plus OH(X-2 Pi) interaction and bound rovibrational states SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DER-WAALS COMPLEXES; ELECTRONIC-SPECTRUM; AR-OH; INFRARED-SPECTROSCOPY; BASIS-SETS; VIBRATIONS AB Adiabatic potential energy surfaces for the (2)A(') and (2)A(') states of the Ar(S-1)-OH(X(2)Pi) complex were calculated using supermolecular unrestricted fourth-order Moller-Plesset perturbation theory and a large correlation consistent basis set supplemented with bond functions. The potential energy surface (PES) of the A(') state has two minima. The global minimum from the unrestricted coupled-cluster calculations with single, double, and noniterative triple excitations occurs for the collinear geometry Ar-H-O at R=7.08a(0) with a well depth of D-e=141.2 cm(-1). There is also a local minimum for the skewed T-shaped form, whereas the Ar-O-H arrangement corresponds to a saddle point. The PES of the A(') state also has two minima, which occur for the two collinear isomers. A variational calculation of the bound rovibrational states was performed. The calculated binding energy, D-0=93.8 cm(-1), and the energies of the bound vibrational states are in good agreement with experiment [see Berry , Chem. Phys. Lett. 178, 301 (1991) and Bonn , J. Chem. Phys. 112, 4942 (2000), preceding paper]. (C) 2000 American Institute of Physics. [S0021-9606(00)01211-3]. C1 Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland. Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA. Pacific NW Lab, Environm Mol Sci Lab, High Performance Computat Chem Grp, Richland, WA 99352 USA. Oakland Univ, Dept Chem, Rochester, MI 48309 USA. Miami Univ, Dept Chem, Oxford, OH 45056 USA. RP Klos, J (reprint author), Univ Warsaw, Dept Chem, Pasteura 1, PL-02093 Warsaw, Poland. RI Klos, Jacek/A-6457-2008 OI Klos, Jacek/0000-0002-7407-303X NR 38 TC 41 Z9 41 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 2000 VL 112 IS 11 BP 4952 EP 4958 DI 10.1063/1.481049 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 290QT UT WOS:000085687900006 ER PT J AU Marjanska, M Chuang, IL Kubinec, MG AF Marjanska, M Chuang, IL Kubinec, MG TI Demonstration of quantum logic gates in liquid crystal nuclear magnetic resonance SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IMPLEMENTATION; ALGORITHM AB H-1-C-13 heteronuclear dipolar couplings are used to produce the NMR (nuclear magnetic resonance) version of a two bit controlled-NOT quantum logic gate. This gate is coupled with the Hadamard gate to complete a circuit which generates the Einstein-Podolsky-Rosen (EPR) state which is the maximally entangled state of a pair of spins. The EPR state is crucial for the potential exponential speed advantage of quantum computers over their classical counterparts. We sample the deviation density matrix of the two spin system to verify the presence of the EPR state. EPR state lifetimes are also measured with this technique, thereby demonstrating the viability of liquid crystals as a platform for quantum computing. (C) 2000 American Institute of Physics. [S0021-9606(00)00611-5]. C1 Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA. RP Kubinec, MG (reprint author), Univ Calif Berkeley, Coll Chem, D62 Hildebrand Hall, Berkeley, CA 94720 USA. NR 11 TC 28 Z9 28 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 2000 VL 112 IS 11 BP 5095 EP 5099 DI 10.1063/1.481064 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 290QT UT WOS:000085687900022 ER PT J AU Herschman, HR MacLaren, DC Iyer, M Namavari, M Bobinski, K Green, LA Wu, L Berk, AJ Toyokuni, T Barrio, JR Cherry, SR Phelps, ME Sandgren, EP Gambhir, SS AF Herschman, HR MacLaren, DC Iyer, M Namavari, M Bobinski, K Green, LA Wu, L Berk, AJ Toyokuni, T Barrio, JR Cherry, SR Phelps, ME Sandgren, EP Gambhir, SS TI Seeing is believing: Non-invasive, quantitative and repetitive imaging of reporter gene expression in living animals, using positron emission tomography SO JOURNAL OF NEUROSCIENCE RESEARCH LA English DT Review DE PET; reporter genes; gene monitoring; MicroPET ID TRANSGENIC MICE; THYMIDINE AB The ability to monitor reporter gene expression in living animals and in patients will permit longitudinal examinations both of somatically transferred DNA in experimental animals and patients and of transgenic constructs expressed in experimental animals. If investigators can non-invasively monitor the organ and tissue specificity, the magnitude and the duration of gene expression from somatically transferred DNA and from transgenes, conceptually new experimental paradigms will be possible. If clinicians can non-invasively monitor the location, extent and duration of somatically transferred genes, they will be better able to determine the correlations between expression of therapeutic genes and clinical outcomes. We have developed two reporter gene systems for in vivo reporter gene imaging in which the protein products of the reporter genes sequester positron-emitting reporter probes. The "PET reporter gene" dependent sequestration of the "PET reporter probes" is subsequently measured in living animals by Positron Emission Tomography (PET). We describe here the principles of PET reporter gene/PET reporter probe in vivo imaging, the development of two imaging systems, and the validation of their ability to non-invasively, quantitatively and repetitively image reporter gene expression in murine viral gene transfer and transgenic models. J. Neurosci. Res. 59: 699-705, 2000. (C) 2000 Wiley-Liss, Inc. C1 Univ Calif Los Angeles, Mol Biol Inst 310, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Sch Med, Crump Inst Biol Imaging, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Sch Med, US DOE, Lab Struct Biol & Mol Med, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Sch Med, Dept Mol & Med Pharmacol, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Jonsson Comprehens Canc Ctr, Los Angeles, CA 90024 USA. Univ Calif Los Angeles, Sch Med, Dept Biomath, Los Angeles, CA 90024 USA. Univ Wisconsin, Sch Vet Med, Madison, WI 53706 USA. RP Herschman, HR (reprint author), Univ Calif Los Angeles, Mol Biol Inst 310, 611 Charles E Young Dr E, Los Angeles, CA 90095 USA. NR 12 TC 74 Z9 77 U1 0 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0360-4012 J9 J NEUROSCI RES JI J. Neurosci. Res. PD MAR 15 PY 2000 VL 59 IS 6 BP 699 EP 705 DI 10.1002/(SICI)1097-4547(20000315)59:6<699::AID-JNR1>3.0.CO;2-1 PG 7 WC Neurosciences SC Neurosciences & Neurology GA 290VH UT WOS:000085698200001 PM 10700006 ER PT J AU Wang, XB Wang, LS AF Wang, XB Wang, LS TI Photodetachment of multiply charged anions: The electronic structure of gaseous square-planar transition metal complexes PtX42- (X = Cl, Br) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID GAS-PHASE; CONSTRUCTION PRINCIPLE; NEGATIVE-IONS; CLOSED-SHELL; PALLADIUM(II); PLATINUM(II); ENERGIES AB Two square-planar 5d transition metal complexes, PtX42- (X = Cl, Br), were observed in the gas phase using ion-trap mass spectrometry and an electrospray ionization source. Photodetachment photoelectron spectroscopy was used to probe their electronic structure, and their photoelectron spectra were measured at three photon energies, 193, 266, and 355 nm. The spectra for the two complexes were found to be similar, each with 10 well-resolved electronic features. These observed detachment features were qualitatively interpreted using the currently available theoretical calculations. The unprecedented resolution of the spectra afforded in the gas phase allowed us to definitely determine the ground state molecular energy levels for these classical square-planar metal complexes. We found that in PtCl42- all the d-orbitals are above the ligand-derived orbitals, whereas in PtBr42- all the d-orbitals are stabilized while the ligand-orbitals are destabilized, leading to an overlap between the d- and ligand-orbitals. Furthermore, the binding energies of the second excess electron in PtX42- were found surprisingly to be negative by -0.25 and -0.04 eV for X = Cl and Br, respectively. The negative electron-binding energies indicate that the two gaseous dianions are in fact electronically unstable against electron loss owing to the strong intramolecular Coulomb repulsion between the two excess charges. Photon-energy-dependent studies clearly revealed the dianion nature of these species and allowed the repulsive Coulomb barriers to be estimated. C1 Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Lab, W R Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. RP Wang, LS (reprint author), Washington State Univ, Dept Phys, 2710 Univ Dr, Richland, WA 99352 USA. NR 51 TC 38 Z9 38 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 15 PY 2000 VL 122 IS 10 BP 2339 EP 2345 DI 10.1021/ja9935106 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA 296WZ UT WOS:000086050900024 ER PT J AU Wang, R Geiger, C Chen, LH Swanson, B Whitten, DG AF Wang, R Geiger, C Chen, LH Swanson, B Whitten, DG TI Direct observation of sol-gel conversion: The role of the solvent in organogel formation SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ORGANIC GELS; GELATORS C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. Univ Rochester, Dept Chem, Ctr Photoinduced Transfer, Rochester, NY 14627 USA. RP Swanson, B (reprint author), Univ Calif Los Alamos Natl Lab, Biosci Div, POB 1663, Los Alamos, NM 87545 USA. NR 14 TC 182 Z9 185 U1 4 U2 41 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 15 PY 2000 VL 122 IS 10 BP 2399 EP 2400 DI 10.1021/ja993991t PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 296WZ UT WOS:000086050900042 ER PT J AU Tompson, SR AF Tompson, SR TI The impact of information on society: An examination of its nature, value and usage. SO JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE LA English DT Book Review C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tompson, SR (reprint author), Fermi Natl Accelerator Lab, POB 500,MS 109, Batavia, IL 60510 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0002-8231 J9 J AM SOC INFORM SCI JI J. Am. Soc. Inf. Sci. PD MAR 15 PY 2000 VL 51 IS 5 BP 487 EP 488 PG 2 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA 287FK UT WOS:000085495700009 ER PT J AU Istratov, AA Flink, C Hieslmair, H McHugo, SA Weber, ER AF Istratov, AA Flink, C Hieslmair, H McHugo, SA Weber, ER TI Diffusion, solubility and gettering of copper in silicon SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT International Conference on Advanced Materials: Sympopsium M - Silicon-based Materials and Devices CY JUN 13-18, 1999 CL BEIJING, PEOPLES R CHINA SP IUMRS DE silicon; copper; gettering ID TRANSIENT ION-DRIFT; COEFFICIENT AB The feasibility of quantitative predictive modeling of gettering of Cu in silicon, which requires quantitative understanding of its diffusivity and precipitation behavior, is discussed. Investigations of diffusion of Cu at low temperatures enabled us to determine the pairing constants of copper with boron, re-evaluate its diffusivity at room temperature in p-Si, and to predict its diffusivity in p(+)-Si substrates. We demonstrate that copper may either precipitate in the bulk of the wafer or diffuse to its surface, depending on the position of Fermi level in the sample. It is suggested that the Fermi level position determines the sign and magnitude of the electrostatic charge on the growing copper precipitates, and thus enhances or suppresses precipitation of interstitial copper ions. Modeling of p/p(+) segregation gettering of copper shows that while the copper can be gettered in p(+) layer during or after high-temperature anneals, it eventually will be released and will precipitate in the device region within the first few months of operation, unless more stable gettering (precipitation) sites for copper are utilized. An n-type layer is predicted to be an effective gettering site. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Istratov, AA (reprint author), Univ Calif Berkeley, Mailstop 62-203,1 Cyclotron Rd, Berkeley, CA 94720 USA. OI Hieslmair, Henry/0000-0002-5842-1882 NR 18 TC 41 Z9 43 U1 2 U2 15 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD MAR 15 PY 2000 VL 72 IS 2-3 BP 99 EP 104 DI 10.1016/S0921-5107(99)00514-0 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA 298GL UT WOS:000086130900007 ER PT J AU Koplow, JP Goldberg, L Moeller, RP Kliner, DAV AF Koplow, JP Goldberg, L Moeller, RP Kliner, DAV TI Polarization-maintaining, double-clad fiber amplifier employing externally applied stress-induced birefringence SO OPTICS LETTERS LA English DT Article ID SINGLE-MODE FIBERS; ERBIUM-DOPED FIBER; OPTICAL FIBERS; LASER AB We report a new approach to obtaining linear-polarization operation of a rare-earth-doped fiber amplifier in which the gain fiber is coiled under tension to induce birefringence. We demonstrated this method by constructing an Er/Yb-doped, double-clad, single-mode fiber amplifier with an output power of 530 mW and a polarization extinction ratio of >17 dB (when seeded with linearly polarized light) at a wavelength of similar to 1.5 mu m. The technique is achromatic, permits single- or multiple-pass operation of the amplifier, requires no additional components in the optical path, leaves the fiber ends unobstructed, and is inexpensive to implement. (C) 2000 Optical Society of America OCIS codes: 060.2420, 060.2320, 260.1440, 140.4480, 140.3510. C1 USN, Res Lab, Washington, DC 20375 USA. Sandia Natl Labs, Livermore, CA 94551 USA. RP Koplow, JP (reprint author), USN, Res Lab, Washington, DC 20375 USA. NR 22 TC 7 Z9 7 U1 0 U2 3 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 MAR 15 PY 2000 VL 25 IS 6 BP 387 EP 389 DI 10.1364/OL.25.000387 PG 3 WC Optics SC Optics GA 293HR UT WOS:000085846500009 PM 18059888 ER PT J AU Brenier, Y Levy, D AF Brenier, Y Levy, D TI Dissipative behavior of some fully non-linear KdV-type equations SO PHYSICA D LA English DT Article DE KdV-type equations; finite-difference methods; nonlinear dynamics ID NUMERICAL SCHEME; OSCILLATIONS; BINARY AB The KdV equation can be considered as a special case of the general equation u(t) + f(u)(x) - delta g(u(xx))(x) = 0, delta > 0, where f is non-linear and g is linear, namely f(u) = u(2)/2 and g(v) = v. As the parameter delta tends to 0, the dispersive behavior of the KdV equation has been throughly investigated (see, e.g., [P.G. Drazin, Solitons, London Math. Sec. Lect. Note Ser. 85, Cambridge University Press, Cambridge, 1983; P.D. Lax, C.D. Levermore, The small dispersion limit of the Korteweg-de Vries equation, III, Commun. Pure Appl. Math. 36 (1983) 809-829; G.B. Whitham, Linear and Nonlinear Waves, Wiley/lnterscience, New York, 1974] and the references therein). We show through numerical evidence that a completely different, dissipative behavior occurs when g is non-linear, namely when g is an even concave function such as g(v) = -\v\ or g(v) = -v(2). In particular, our numerical results hint that as delta --> 0 the solutions strongly converge to the unique entropy solution of the formal limit equation, in total contrast with the solutions of the KdV equation. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Math, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Paris 06, F-75252 Paris, France. RP Levy, D (reprint author), Univ Calif Berkeley, Dept Math, Berkeley, CA 94720 USA. NR 11 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD MAR 15 PY 2000 VL 137 IS 3-4 BP 277 EP 294 DI 10.1016/S0167-2789(99)00190-6 PG 18 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA 278RH UT WOS:000085002400006 ER PT J AU Arenholz, E Kay, AW Fadley, CS Grush, MM Callcott, TA Ederer, DL Heske, C Hussain, Z AF Arenholz, E Kay, AW Fadley, CS Grush, MM Callcott, TA Ederer, DL Heske, C Hussain, Z TI Multiatom resonant photoemission observed via secondary processes: Auger decay and x-ray fluorescence SO PHYSICAL REVIEW B LA English DT Article ID ADVANCED LIGHT-SOURCE; PHOTOELECTRON DIFFRACTION; SCATTERING; SPIN AB We present experimental evidence that the newly discovered multiatom resonant photoemission effect can be observed via secondary decay processes of the primary core hole: Auger electron emission, from Fe2O3, where the O KL23Lu23 intensity is enhanced by 90% when h v is tuned to the Fe L-3 edge, and fluorescent x-ray emission, from MnO, where the O K alpha fluorescence intensity shows an enhancement of more than 100% at the Mn L-3 edge when properly corrected for saturation and self-absorption effects. C1 Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Tulane Univ, Dept Phys, New Orleans, LA 70118 USA. Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. RP Heske, C (reprint author), Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 16 TC 15 Z9 15 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 MAR 15 PY 2000 VL 61 IS 11 BP 7183 EP 7186 DI 10.1103/PhysRevB.61.7183 PG 4 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200007 ER PT J AU Mikucki, J Baj, M Wasik, D Walukiewicz, W Bi, WG Tu, CW AF Mikucki, J Baj, M Wasik, D Walukiewicz, W Bi, WG Tu, CW TI Metastability of the phosphorus antisite defect in low-temperature InP SO PHYSICAL REVIEW B LA English DT Article ID SPECTROSCOPY; GAAS AB We report on the transport properties of low-temperature (LT) InP/InxGa1-xAs/InP heterostructures and LT InP thin films. Hall effect measurements performed at hydrostatic pressure up to 1.5 GPa and temperatures ranging from 4.2 K to 250 K on both types of samples as well as Shubnikov-de Haas experiments made on heterostructures clearly reveal the metastable character of phosphorus antisite defects present in LT WP layers. C1 Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif San Diego, Dept Elect Engn, La Jolla, CA 92093 USA. RP Mikucki, J (reprint author), Univ Warsaw, Inst Expt Phys, Hoza 69, PL-00681 Warsaw, Poland. NR 8 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 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7199 EP 7202 DI 10.1103/PhysRevB.61.7199 PG 4 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200011 ER PT J AU Wang, LW AF Wang, LW TI Real and spurious solutions of the 8x8 k center dot p model for nanostructures SO PHYSICAL REVIEW B LA English DT Article ID BAND; APPROXIMATION AB Quantum dot wave functions an constructed in the 8 x 8 k.p model from three bulk states: k(1), k(2), and k(3). We found that the 8 x 8 k.p k(2) bulk state (far from Gamma, belonging to the electon-light hole bands) does not exist in the more realistic atomistic pseudopotential calculation. As a result, 8 x 8 k.p nanostructure solutions which critically depend on this k(2) bulk state are spurious. These include the 8x8 k.p quantum dot band gap "intrinsic'' surface states and oscillating hole states. On the other hand, if the contribution of this k(2) state is small and decays with increasing nanostructure size, the corresponding nanostructure state is real. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Wang, LW (reprint author), Lawrence Berkeley Natl Lab, NERSC, Berkeley, CA 94720 USA. NR 20 TC 17 Z9 18 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7241 EP 7244 DI 10.1103/PhysRevB.61.7241 PG 4 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200022 ER PT J AU Marinescu, DC Quinn, JJ Giuliani, GF AF Marinescu, DC Quinn, JJ Giuliani, GF TI Spin instabilities in semiconductor superlattices SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL ELECTRON-GAS; MAGNETIC-FIELD AB The subband levels of quantum wells grown in a periodic array form minibands whose bandwidth Delta depends on the probability of interlayer tunneling. In the presence of a strong magnetic field, this system of minibands can exhibit various Coulomb-interaction-driven spin polarization instabilities at an integral value of the filling factor v. We investigate in particular the Hartree-Fock phase diagram in the case in which the n=0 spin-up and n=1 spin-down Landau levels are separated by an energy smaller than Delta. A spin-density-wave ground state is shown to occur at filling factor v=2. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. RP Marinescu, DC (reprint author), Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA. NR 13 TC 13 Z9 13 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7245 EP 7248 DI 10.1103/PhysRevB.61.7245 PG 4 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200023 ER PT J AU Tostmann, H DiMasi, E Pershan, PS Ocko, BM Shpyrko, OG Deutsch, M AF Tostmann, H DiMasi, E Pershan, PS Ocko, BM Shpyrko, OG Deutsch, M TI Microscopic surface structure of liquid alkali metals SO PHYSICAL REVIEW B LA English DT Article ID X-RAY REFLECTIVITY; VAPOR INTERFACE; ELECTRON; TENSION; GALLIUM AB We report an x-ray scattering study of the microscopic structure of the surface of a liquid alkali metal. The bulk liquid structure factor of the eutectic K67Na33 alloy is characteristic of an ideal mixture, and so shares the properties of an elemental liquid alkali metal. Analysis of off-specular diffuse scattering and specular x-ray reflectivity shows that the surface roughness of the K-Na alloy follows simple capillary wave behavior with a surface structure factor indicative of surface-induced layering. Comparison of the low-angle tail of the K67Na33 surface structure factor with the one measured for liquid Ga and In previously suggests that layering is less pronounced in alkali metals. Controlled exposure of the liquid to H-2 and O-2 gas does not affect the surface structure, indicating that oxide and hydride are not stable at the liquid surface under these experimental conditions. C1 Harvard Univ, Div 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-52100 Ramat Gan, Israel. RP Tostmann, H (reprint author), Harvard Univ, Div Appl Sci, Cambridge, MA 02138 USA. RI Shpyrko, Oleg/J-3970-2012 NR 23 TC 28 Z9 28 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7284 EP 7287 DI 10.1103/PhysRevB.61.7284 PG 4 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200033 ER PT J AU Wosnitza, J Wanka, S Hagel, J Balthes, E Harrison, N Schlueter, JA Kini, AM Geiser, U Mohtasham, J Winter, RW Gard, GL AF Wosnitza, J Wanka, S Hagel, J Balthes, E Harrison, N Schlueter, JA Kini, AM Geiser, U Mohtasham, J Winter, RW Gard, GL TI Two-dimensional Fermi liquid with fixed chemical potential SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM OSCILLATIONS; ORGANIC CONDUCTOR; MAGNETIC-FIELDS; SURFACE; KAPPA-(BEDT-TTF)(2)I-3; BEHAVIOR; STATES; ANION AB de Haas-van Alphen measurements made on the organic metal beta "-(BEDT-TTF)(2)SF5CH2CF2SO3 reveal the existence of an ideal two-dimensional (2D) Fermi surface, but rather than having the conventional sawtooth wave form that is normally observed in all other 2D electron gases, instead, an "inverse sawtooth'' wave form is observed, which is to be expected when the chemical potential is pinned at a constant value. While this proves the existence of the theoretically predicted quasi-one-dimensional band, it further implies that this band has an exceptionally large density of states. C1 Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany. MPI, Grenoble High Magnet Field Lab, F-38042 Grenoble, France. CNRS, F-38042 Grenoble, France. LANL Los Alamos, Natl Lab High Energy Phys, Los Alamos, NM 87545 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. RP Wosnitza, J (reprint author), Univ Karlsruhe, Inst Phys, Kaiserstr 12, D-76128 Karlsruhe, Germany. RI Kini, Aravinda/F-4467-2012 NR 24 TC 48 Z9 49 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7383 EP 7387 DI 10.1103/PhysRevB.61.7383 PG 5 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200053 ER PT J AU Espinosa, FJ de Leon, JM Conradson, SD Pena, JL Zapata-Torres, M AF Espinosa, FJ de Leon, JM Conradson, SD Pena, JL Zapata-Torres, M TI Local atomic structure of CdTe : In at high In concentrations SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION FINE-STRUCTURE; LATTICE INSTABILITY; SILICON; DONORS; FILMS AB The local atomic structure of CdTe:In at In concentrations of 0, 0.5, and 6 at. % was investigated using x-ray absorption spectroscopy. Changes in the x-ray-absorption near-edge structure (XANES) and the x-ray-absorption fine structure (XAFS) were detected for the In K edge. In the In XANES region, the 0.5 at. % sample exhibits a higher amplitude of the white line than the 6 at. % sample. While in the In K-edge XAFS of both samples only the first shell contribution is apparent; the environment around In in the 0.5 at. % sample shows larger disorder than in the 6 at. % In sample. From Cd and Te XAFS the data exhibit the first three shells of neighbors in agreement with the zinc-blende structure of CdTe, showing increased disorder as a function of In concentration. Results from fits and simulations of both XAFS and XANES indicate the formation of A centers in the 0.5 at. % sample. For the 6 at. % sample the results indicate a smaller amount of A centers. The possibility of DX center formation is discussed. C1 CINVESTAV, Unidad Merida, Merida 97310, Venezuela. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Espinosa, FJ (reprint author), CINVESTAV, Unidad Merida, Merida 97310, Venezuela. NR 25 TC 10 Z9 10 U1 1 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 2000 VL 61 IS 11 BP 7428 EP 7432 DI 10.1103/PhysRevB.61.7428 PG 5 WC Physics, Condensed Matter SC Physics GA 296NV UT WOS:000086031200060 ER PT J AU Zhang, Y Mascarenhas, A Xin, HP Tu, CW AF Zhang, Y Mascarenhas, A Xin, HP Tu, CW TI Formation of an impurity band and its quantum confinement in heavily doped GaAs : N SO PHYSICAL REVIEW B LA English DT Article ID GAP1-XNX ALLOYS; GAP; ELECTROREFLECTANCE; SPECTROSCOPY; LUMINESCENCE; DEPENDENCE; GAAS1-XNX; EXCITONS AB Quantum confinement in GaAs1-xNx/GaAs quantum wells (0.009lle) and beta 282(Arg-->Gln)) located in the atomic model of alpha beta-tubulin near the taxane-binding site. Using molecular modeling, we investigated the conformational behavior of epothilone, which led to the identification of a common pharmacophore shared by taxanes and epothilones. Although two binding modes for the epothilones were predicted, one mode was identified as the preferred epothilone conformation as indicated by the activity of a potent pyridine-epothilone analogue. In addition, the structure-activity relationships of multiple taxanes and epothilones in the tubulin mutant cells can be fully explained by the model presented here, verifying its predictive value. Finally, these pharmacophore and activity data from mutant cells were used to model the tubulin binding of sarcodictyins, a distinct class of microtubule stabilizers, which in contrast to taxanes and the epothilones interact preferentially with the mutant tubulins, The unification of taxane, epothilone, and sarcodictyin chemistries in a single pharmacophore provides a framework to study drug-tubulin interactions that should assist in the rational design of agents targeting tubulin. C1 NCI, Med Branch, NIH, Bethesda, MD 20892 USA. NIDDKD, Genet & Biochem Branch, NIH, Bethesda, MD 20892 USA. NCI, Target Struct Based Drug Discovery, Informat Technol Branch, NIH, Frederick, MD 21702 USA. NCI, Lab Drug Discovery Res & Dev, Dev Therapeut Program, NIH, Frederick, MD 21702 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. Scripps Res Inst, Skaggs Inst Chem Biol, La Jolla, CA 92037 USA. Scripps Res Inst, Dept Chem, La Jolla, CA 92037 USA. RP Giannakakou, P (reprint author), NCI, Med Branch, NIH, Bldg 10,Room 12N226,9000 Rockville Pike, Bethesda, MD 20892 USA. NR 27 TC 370 Z9 384 U1 0 U2 23 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 MAR 14 PY 2000 VL 97 IS 6 BP 2904 EP 2909 DI 10.1073/pnas.040546297 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 294ZR UT WOS:000085941400090 PM 10688884 ER PT J AU Geisz, JF Friedman, DJ Olson, JM Kurtz, SR Reedy, RC Swartzlander, AB Keyes, BM Norman, AG AF Geisz, JF Friedman, DJ Olson, JM Kurtz, SR Reedy, RC Swartzlander, AB Keyes, BM Norman, AG TI BGaInAs alloys lattice matched to GaAs SO APPLIED PHYSICS LETTERS LA English DT Article ID BORON ARSENIDE; ELECTRONIC-STRUCTURE; GROWTH AB We report the epitaxial growth of zinc-blende BxGa1-x-yInyAs and BxGa1-xAs on GaAs substrates with boron concentrations (x) up to 2%-4% by atmospheric-pressure metalorganic chemical vapor deposition. The band gap of BxGa1-xAs increases by only 4-8 meV/%B with increasing boron concentration in this concentration range. We demonstrate an epitaxial BxGa1-x-yInyAs layer deposited on GaAs with a band gap of 1.34 eV that is significantly less strained than a corresponding Ga1-yInyAs layer with the same band gap. (C) 2000 American Institute of Physics. [S0003- 6951(00)02711-X]. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Geisz, JF (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI Norman, Andrew/F-1859-2010 OI Norman, Andrew/0000-0001-6368-521X NR 19 TC 53 Z9 55 U1 0 U2 6 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 13 PY 2000 VL 76 IS 11 BP 1443 EP 1445 DI 10.1063/1.126058 PG 3 WC Physics, Applied SC Physics GA 291LN UT WOS:000085735800031 ER PT J AU Wagenbrunn, RF Glozman, LY Plessas, W Varga, K AF Wagenbrunn, RF Glozman, LY Plessas, W Varga, K TI Extension of the GBE chiral constituent quark model SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT Workshop on the Structure of the Nucleon (N 99) CY JUN 07-09, 1999 CL FRASCATI, ITALY SP Italian Natl Inst Nucl Phys, Frascati Natl Lab AB We report on the extension of the chiral quark model based on Goldstone-boson-exchange dynamics.-Beyond the previous model with pseudoscalar meson exchange only we introduce the effects of multiple Goldstone-boson exchanges through vector and scalar meson exchanges. The extended model provides features tl-lat are desired both in baryon spectroscopy and in baryon-baryon dynamics. C1 Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy. KEK, Tanashi Branch, Tanashi, Tokyo 1888501, Japan. Graz Tech Univ, Inst Theoret Phys, A-8010 Graz, Austria. Argonne Natl Lab, Div Phys, Argonne, IL 60638 USA. Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary. RP Wagenbrunn, RF (reprint author), Univ Pavia, Dipartimento Fis Nucl & Teor, Via Bassi 6, I-27100 Pavia, Italy. RI Varga, Kalman/A-7102-2013 NR 8 TC 17 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 13 PY 2000 VL 666 BP 29C EP 32C DI 10.1016/S0375-9474(00)00006-3 PG 4 WC Physics, Nuclear SC Physics GA 296ZG UT WOS:000086056200006 ER PT J AU Radyushkin, AV AF Radyushkin, AV TI Skewed parton distributions SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT Workshop on the Structure of the Nucleon (N 99) CY JUN 07-09, 1999 CL FRASCATI, ITALY SP Italian Natl Inst Nucl Phys, Frascati Natl Lab ID VIRTUAL COMPTON-SCATTERING; NUCLEON; MESONS; ELECTROPRODUCTION; QCD AB Applying perturbative QCD to hard exclusive electroproduction processes one is required to introduce generalized parton distributions. In this talk, I discuss double and skewed distributions, their basic structure, relation to hadronic form factors and usual ("forward") parton densities, modeling SPDs and some recent applications. C1 Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. Jefferson Lab, Newport News, VA 23606 USA. Joint Inst Nucl Res, Theoret Phys Lab, Dubna, Russia. RP Radyushkin, AV (reprint author), Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 13 PY 2000 VL 666 BP 225C EP 233C DI 10.1016/S0375-9474(00)00031-2 PG 9 WC Physics, Nuclear SC Physics GA 296ZG UT WOS:000086056200031 ER PT J AU de Jager, K Pire, B AF de Jager, K Pire, B TI Nucleon form factors '99 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT Workshop on the Structure of the Nucleon (N 99) CY JUN 07-09, 1999 CL FRASCATI, ITALY SP Italian Natl Inst Nucl Phys, Frascati Natl Lab ID ELASTIC ELECTRON-SCATTERING; MOMENTUM AB We review recent progress in the experimental knowledge of and theoretical speculations about nucleon form factors, with special emphasis on the large Q(2) region. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Ecole Polytech, Ctr Phys Theor, Unite Mixte 7644 CNRS, F-91128 Palaiseau, France. RP Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM kees@jlab.org; pire@cpht.polytechnique.fr RI Pire, Bernard/I-3994-2013 NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 13 PY 2000 VL 666 BP 330C EP 333C PG 4 WC Physics, Nuclear SC Physics GA 296ZG UT WOS:000086056200046 ER PT J AU Boer, D Mulders, PJ AF Boer, D Mulders, PJ TI Color gauge invariance in the Drell-Yan process SO NUCLEAR PHYSICS B LA English DT Article ID TRANSVERSE SPIN ASYMMETRIES; HADRON-HADRON SCATTERING; ODD PARTON DISTRIBUTIONS; PERTURBATION-THEORY; POWER CORRECTIONS; COUNTER-EXAMPLE; CROSS-SECTION; FACTORIZATION AB We consider the color gauge invariance of a factorized description of the Drell-Yan process cross section, In particular, we focus on the next-to-leading twist contributions for polarized scattering and on the cross section differential in the transverse momentum of the lepton pair in the region where the transverse momentum is small compared to the hard scale. The hadron tensor is expressed in terms of manifestly color gauge invariant, non-local operator matrix elements and a color gauge invariant treatment of soft gluon poles is given. Also, we clarify the discrepancy between two published results for a single spin asymmetry in the Drell-Yan cross section. This asymmetry arises if such a soft gluon pole is present in a specific twist-three hadronic matrix element. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands. RP Boer, D (reprint author), Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA. RI Boer, Daniel/B-3493-2015; OI Boer, Daniel/0000-0003-0985-4662; Mulders, Piet/0000-0001-7678-6917 NR 35 TC 54 Z9 54 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR 13 PY 2000 VL 569 IS 1-3 BP 505 EP 526 DI 10.1016/S0550-3213(99)00719-1 PG 22 WC Physics, Particles & Fields SC Physics GA 296DX UT WOS:000086008700021 ER PT J AU Feng, JL Matchev, KT Moroi, T AF Feng, JL Matchev, KT Moroi, T TI Multi-TeV scalars are natural in minimal supergravity SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOFT SUPERSYMMETRY-BREAKING; RENORMALIZATION-GROUP EQUATIONS; FINE-TUNING PRICE; PRECISION CORRECTIONS; UPPER-BOUNDS; UNIFICATION; CONSTRAINTS; MASSES; MODELS; TERMS AB For a top quark mass fixed to its measured value, we find natural regions of minimal supergravity parameter space when all squarks, sleptons, and heavy Higgs scalars have masses far above I TeV and are possibly beyond the reach of the Large Hadron Collider at CERN. This result is simply understood in terms of "focus point" renormalization group behavior and holds in any supergravity theory with a universal scalar mass that is large relative to other supersymmetry breaking parameters. We highlight the importance of the choice of fundamental parameters for this conclusion and for naturalness discussions in general. C1 Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA. Fermilab Natl Accelerator Lab, Dept Phys Theor, Batavia, IL 60510 USA. RP Feng, JL (reprint author), Inst Adv Study, Sch Nat Sci, Olden Lane, Princeton, NJ 08540 USA. NR 35 TC 400 Z9 400 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 13 PY 2000 VL 84 IS 11 BP 2322 EP 2325 DI 10.1103/PhysRevLett.84.2322 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900010 ER PT J AU Klein, SR Nystrand, J AF Klein, SR Nystrand, J TI Interference in exclusive vector meson production in heavy-ion collisions SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHOTON AB Vector mesons are produced copiously in peripheral relativistic heavy-ion collisions. Virtual photons from one ion can fluctuate into quark-antiquark pairs and scatter from the second ion, emerging as vector mesons. The emitter and target are indistinguishable, so emission from the two ions will interfere. Vector mesons have negative parity so the interference is destructive, reducing the production of mesons with small transverse momentum. The mesons are short lived, and decay before emission from the two ions can overlap. However, the decay-product wave functions overlap and interfere since they are produced in an entangled state, providing an example of the Einstein-Podolsky-Rosen paradox. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Klein, SR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 18 TC 55 Z9 55 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 13 PY 2000 VL 84 IS 11 BP 2330 EP 2333 DI 10.1103/PhysRevLett.84.2330 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900012 ER PT J AU Finn, JM del-Castillo-Negrete, D Barnes, DC AF Finn, JM del-Castillo-Negrete, D Barnes, DC TI Destabilization of the m=1 diocotron mode in non-neutral plasmas SO PHYSICAL REVIEW LETTERS LA English DT Article ID HOLLOW ELECTRON COLUMNS; NONNEUTRAL PLASMA; INSTABILITY; EQUILIBRIA; LENGTH AB The theory for a Penning-Malmberg trap predicts m = 1 diocotron stability. However, experiments with hollow profiles show robust exponential growth. We propose a new mechanism of destabilization of this mode, involving parallel compression due to end curvature. The results are in good agreement with the experiments. The resulting modified drift-Poisson equations are analogous to the geophysical shallow water equations, and conservation of line integrated density corresponds to that of potential vorticity. This analogy predicts Rossby waves in non-neutral plasmas and an m = 1 instability in fluids. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Div, Los Alamos, NM 87545 USA. RP Finn, JM (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. OI del-Castillo-Negrete, Diego/0000-0001-7183-801X NR 20 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 13 PY 2000 VL 84 IS 11 BP 2401 EP 2404 DI 10.1103/PhysRevLett.84.2401 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900030 ER PT J AU Takahashi, K Kodama, R Tanaka, KA Hashimoto, H Kato, Y Mima, K Weber, FA Barbee, TW Da Silva, LB AF Takahashi, K Kodama, R Tanaka, KA Hashimoto, H Kato, Y Mima, K Weber, FA Barbee, TW Da Silva, LB TI Laser-hole boring into overdense plasmas measured with soft x-ray laser probing SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRON-DENSITY; FILAMENTATION; IGNITION AB A laser self-focused channel formation into overdense plasmas was observed using a soft x-ray laser probe system with a grid image refractometry (GIR) technique. 1.053 mu m laser light with a 100 ps pulse duration was focused onto a preformed plasma at an intensity of 2 X 10(17) W/cm(2). Cross sections of the channel were obtained which show a 30 mu m diameter in overdense plasmas. The channel width in the overdense region was kept narrow as a result of self-focusing. Conically diverging density ridges were also observed along the channel, indicating a Mach cone created by a shock wave due to the supersonic propagation of the channel front. C1 Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Osaka Univ, Dept Electromagnet Engn, Suita, Osaka 5650871, Japan. RP Takahashi, K (reprint author), Osaka Univ, Inst Laser Engn, Yamada Oka 2-6, Suita, Osaka 5650871, Japan. RI Mima, Kunioki/H-9014-2016; Kodama, Ryosuke/G-2627-2016 NR 16 TC 31 Z9 31 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 13 PY 2000 VL 84 IS 11 BP 2405 EP 2408 DI 10.1103/PhysRevLett.84.2405 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900031 ER PT J AU Schwegler, E Galli, G Gygi, F AF Schwegler, E Galli, G Gygi, F TI Water under pressure SO PHYSICAL REVIEW LETTERS LA English DT Article ID MOLECULAR-DYNAMICS; LIQUID WATER; NEUTRON-DIFFRACTION; DENSITY; ICE; GPA AB Water under pressure is investigated by first principles molecular dynamics, with a focus on the changes in hydrogen bonding and the oxygen network in the nondissociative regime. At a pressure of 10 GPa and a temperature of 600 K, which is close to the freezing point, no appreciable molecular dissociation is observed in the simulations. However, the structure of water is substantially altered from that at ambient conditions. The liquid exhibits a much larger coordination of oxygen atoms, an essential weakening of hydrogen bonding, and sizable changes in the density of electronic states close to the Fermi level. Our results provide new structural data for direct comparison with future experiments. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. RI Schwegler, Eric/F-7294-2010; Schwegler, Eric/A-2436-2016 OI Schwegler, Eric/0000-0003-3635-7418 NR 25 TC 119 Z9 119 U1 3 U2 19 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 MAR 13 PY 2000 VL 84 IS 11 BP 2429 EP 2432 DI 10.1103/PhysRevLett.84.2429 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900037 ER PT J AU van Otterlo, A Scalettar, RT Zimanyi, GT Olsson, R Petrean, A Kwok, W Vinokur, V AF van Otterlo, A Scalettar, RT Zimanyi, GT Olsson, R Petrean, A Kwok, W Vinokur, V TI Dynamic phases and the peak effect in dirty type II superconductors SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUX-LINE-LATTICE; VORTEX-LATTICE; TOPOLOGICAL DEFECTS; GLASS-TRANSITION; DRIVEN LATTICES; DISORDER; YBA2CU3O7-DELTA; VORTICES; CRYSTALS; DIAGRAM AB We study numerically and experimentally the dynamics of driven Vortex matter. Our London-Langevin simulations find that the critical current exhibits a peak both across the Bragg glass to vortex glass transition and across the melting line. The peak is accompanied by a clear crossing of the I-V curves. We report transport measurements on untwinned YBCO crystals, in complete accordance with these findings. At higher drives disorder is averaged to reduced values, and in three dimensions the vortices reorder into a "moving solid." The effect of the disorder can be well represented with a "shaking temperature" which is inversely proportional to the velocity. C1 Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP van Otterlo, A (reprint author), Leiden Univ, Inst Lorentz, POB 9506, NL-2300 RA Leiden, Netherlands. NR 37 TC 31 Z9 31 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 MAR 13 PY 2000 VL 84 IS 11 BP 2493 EP 2496 DI 10.1103/PhysRevLett.84.2493 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900053 ER PT J AU Gammel, PL Barber, B Lopez, D Ramirez, AP Bishop, DJ Bud'ko, SL Canfield, PC AF Gammel, PL Barber, B Lopez, D Ramirez, AP Bishop, DJ Bud'ko, SL Canfield, PC TI Enhanced critical currents of superconducting ErNi2B2C in the ferromagnetically ordered state SO PHYSICAL REVIEW LETTERS LA English DT Article ID WEAK FERROMAGNETISM; MAGNETIC SUPERCONDUCTORS; METAMAGNETIC TRANSITIONS; ANGULAR-DEPENDENCE; TBNI2B2C; COEXISTENCE; LATTICE AB We report on transport and magnetization studies of the critical current in single crystal ErNi2B2C for applied fields below 4 kG. Below T approximate to 2.5 K superconductivity coexists with weak ferromagnetism. We fmd that the critical currents are strongly enhanced for all field orientations in this ferromagnetic regime, corresponding to a threefold increase of the pinning force of the flux line lattice. We speculate that this increase is due to strong pair breaking by the ferromagnetism. C1 Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Gammel, PL (reprint author), Bell Labs, Lucent Technol, 600 Mt Ave, Murray Hill, NJ 07974 USA. RI Canfield, Paul/H-2698-2014 NR 22 TC 45 Z9 46 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 MAR 13 PY 2000 VL 84 IS 11 BP 2497 EP 2500 DI 10.1103/PhysRevLett.84.2497 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900054 ER PT J AU Knill, E Laflamme, R Viola, L AF Knill, E Laflamme, R Viola, L TI Theory of quantum error correction for general noise SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENTANGLEMENT; COMPUTATION; DECOHERENCE; CODES AB A measure of quality of an error-correcting code is the maximum number of errors that it is able to correct. We show that a suitable notion of "number of errors" e makes sense for any quantum or classical system in the presence of arbitrary interactions. Thus, e-error-correcting codes protect information without requiring the usual assumptions of independence. We prove the existence of large codes for both quantum and classical information. By viewing error-correcting codes as subsystems, we relate codes to irreducible representations of operator algebras and show that noiseless subsystems are infinite-distance error-correcting codes. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. MIT, Arbeloff Lab Informat Syst & Technol, Dept Mech Engn, Cambridge, MA 02139 USA. RP Los Alamos Natl Lab, MS B265,POB 1663, Los Alamos, NM 87545 USA. EM knill@lanl.gov; laflamme@lanl.gov; vlorenza@mit.edu NR 16 TC 397 Z9 397 U1 5 U2 17 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 MAR 13 PY 2000 VL 84 IS 11 BP 2525 EP 2528 DI 10.1103/PhysRevLett.84.2525 PG 4 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900061 ER PT J AU McNabb, DP Anderson, JD Becker, JA Weiss, MS AF McNabb, DP Anderson, JD Becker, JA Weiss, MS TI Comment on "accelerated emission of gamma rays from the 31-yr isomer of Hf-178 induced by x-ray irradiation" SO PHYSICAL REVIEW LETTERS LA English DT Article C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP McNabb, DP (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 4 TC 22 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 13 PY 2000 VL 84 IS 11 BP 2542 EP 2542 DI 10.1103/PhysRevLett.84.2542 PG 1 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900066 ER PT J AU Collins, CB Davanloo, F Iosif, MC Dussart, R Hicks, JM Karamian, SA Ur, CA Popescu, II Kirischuk, VI Roberts, HE McDaniel, P Crist, CE AF Collins, CB Davanloo, F Iosif, MC Dussart, R Hicks, JM Karamian, SA Ur, CA Popescu, II Kirischuk, VI Roberts, HE McDaniel, P Crist, CE TI Comment on "accelerated emission of gamma rays from the 31-yr isomer of Hf-178 induced by x-ray irradiation" Collins et al. reply SO PHYSICAL REVIEW LETTERS LA English DT Editorial Material C1 Univ Texas, Ctr Quantum Elect, Richardson, TX 75083 USA. Joint Inst Nucl Res, Dubna 141980, Russia. H Hulubei Inst Phys & Nucl Engn, Bucharest, Romania. IGE Fdn, Bucharest, Romania. Inst Nucl Res, Kiev, Ukraine. SRS Technol, Syst Tech Grp, Huntsville, AL 35812 USA. USAF, Res Lab, DEPA, Kirtland AFB, NM 87117 USA. Sandia Natl Labs, Kirtland AFB, NM 87117 USA. RP Collins, CB (reprint author), Univ Texas, Ctr Quantum Elect, Richardson, TX 75083 USA. NR 5 TC 5 Z9 6 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 MAR 13 PY 2000 VL 84 IS 11 BP 2544 EP 2545 DI 10.1103/PhysRevLett.84.2544 PG 2 WC Physics, Multidisciplinary SC Physics GA 292JZ UT WOS:000085791900068 ER PT J AU Dodelson, S Gaztanaga, E AF Dodelson, S Gaztanaga, E TI Inverting the angular correlation function SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE methods : numerical; large-scale structure of Universe ID APM GALAXY SURVEY; POWER SPECTRUM AB The two point angular correlation function is an excellent measure of structure in the Universe. To extract from it the three-dimensional power spectrum, one must invert Limber's equation. Here we perform this inversion using a Bayesian prior constraining the smoothness of the power spectrum. Among other virtues, this technique allows for the possibility that the estimates of the angular correlation function are correlated from bin to bin. The outputs of this technique are estimators for the binned power spectrum and a full covariance matrix. Angular correlations mix small and large scales but after the inversion, small-scale data can be trivially eliminated, thereby allowing for realistic constraints on theories of large-scale structure. We analyse the automated plate measurement (APM) catalogue as an example, comparing our results with previous results. As a by-product of these tests, we find - in rough agreement with previous work - that APM places stringent constraints on cold dark matter inspired models, with the shape parameter constrained to be 0.25 +/- 0.04 (using data with wavenumber k less than or equal to 0.1 h Mpc(-1)). This range of allowed values uses the full power spectrum covariance matrix, but assumes negligible covariance in the off-diagonal angular correlation error matrix, which is estimated with a large angular resolution of 0.5 degrees (in the range 0.5 degrees and 20 degrees). C1 Fermi Natl Accelerator Lab, NASA, Batavia, IL 60510 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. CSIC, Inst Estudis Espacials Catalunya, ES-08034 Barcelona, Spain. INAOE, Astrofis, Puebla 7200, Mexico. RP Dodelson, S (reprint author), Fermi Natl Accelerator Lab, NASA, POB 500, Batavia, IL 60510 USA. OI Gaztanaga, Enrique/0000-0001-9632-0815 NR 13 TC 21 Z9 21 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD MAR 11 PY 2000 VL 312 IS 4 BP 774 EP 780 DI 10.1046/j.1365-8711.2000.03186.x PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 302WB UT WOS:000086388500013 ER PT J AU Elias, JE AF Elias, JE TI New developments in photodetection for particle physics and nuclear physics SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2nd International Conference on New Developments in Photodetection CY JUN 21-25, 1999 CL BEAUNE, FRANCE SP Direct Sci Matiere, Inst Natl Phys Nucleaire & Phys Particules DE photodetection; vacuum devices; gaseous photodetector; solid state devices ID HYBRID AB Photodetectors are widely used in particle and nuclear physics research. Since the beginning of the modern era of photoelectric transducers in the late 1930s, many types of devices have been developed and exploited for physics research. New performance requirements arising in physics experiments have often provided very interesting technological drivers for industry. New ideas for photo-detection are rapidly adapted by the physics community to enable more powerful experimental capabilities. This report gives a sampling of new developments in photodetection for physics research in the period since the first conference in this series, Beaune 96. Representative examples of advances in Vacuum devices, solid-state devices and gaseous photodetectors are described including, where appropriate, areas where technological improvements are needed or expected. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Elias, JE (reprint author), Fermi Natl Accelerator Lab, Mail Stop 318,POB 500, Batavia, IL 60510 USA. NR 16 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 11 PY 2000 VL 442 IS 1-3 BP 1 EP 7 DI 10.1016/S0168-9002(99)01193-6 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 303LW UT WOS:000086424200003 ER PT J AU Groom, DE Holland, SE Levi, ME Palaio, NP Perlmutter, S Stover, RJ Wei, M AF Groom, DE Holland, SE Levi, ME Palaio, NP Perlmutter, S Stover, RJ Wei, M TI Back-illuminated, fully-depleted CCD image sensors for use in optical and near-IR astronomy SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2nd International Conference on New Developments in Photodetection CY JUN 21-25, 1999 CL BEAUNE, FRANCE SP Direct Sci Matiere, Inst Natl Phys Nucleaire & Phys Particules ID HIGH-RESISTIVITY SILICON; LARGE-AREA; FABRICATION; DETECTORS; PERFORMANCE; ARRAYS AB Charge-coupled devices (CCDs) of novel design have been fabricated at Lawrence Berkeley National Laboratory [LBNL]), and the first large-format science-grade chips for astronomical imaging are now being characterized at Lick Observatory. They are made on 300-mu m thick n-type high-resistivity( similar to 10000 Omega cm) silicon wafers, using a technology developed at LBNL to fabricate low-leakage silicon microstrip detectors for high-energy physics. A bias voltage applied via a transparent contact on the back side fully depletes the substrate, making the entire volume photosensitive and ensuring that charge reaches the potential wells with minimal lateral diffusion. The development of a thin, transparent back-side contact compatible with fully depleted operation permits blue response comparable to that obtained with thinned CCDs. Since the entire region is active, high quantum efficiency is maintained to nearly lambda = 1000 nm, above which the silicon band gap effectively truncates photoproduction. Early characterization results indicate a charge transfer efficiency > 0.999995, readout noise 4 e's at - 132 degrees C, full well capacity > 300 000 e's, and quantum efficiency > 85% at lambda = 900 nm. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Santa Cruz, Lick Observ, Santa Cruz, CA 95064 USA. RP Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM deg@lbl.gov RI Holland, Stephen/H-7890-2013; Perlmutter, Saul/I-3505-2015 OI Perlmutter, Saul/0000-0002-4436-4661 NR 25 TC 16 Z9 16 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 11 PY 2000 VL 442 IS 1-3 BP 216 EP 222 DI 10.1016/S0168-9002(99)01224-3 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 303LW UT WOS:000086424200035 ER PT J AU Cushman, P Heering, A Ronzhin, A AF Cushman, P Heering, A Ronzhin, A TI Custom HPD readout for the CMS HCAL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2nd International Conference on New Developments in Photodetection CY JUN 21-25, 1999 CL BEAUNE, FRANCE SP Direct Sci Matiere, Inst Natl Phys Nucleaire & Phys Particules ID TUBES AB Over 10000 channels from the CMS tile/fiber hadronic calorimeter (The CMS Hadron Calorimeter TDR, CERN/LHCC 97-31, June 20, 1997) will be read out by custom 19 and 73-channel HPD's in a 4 T field. Experimental constraints on the tube design have produced a faster tube with a larger active area and minimum accelerating gap. Quality assurance stations have been developed for fast processing of 600 tubes. Registration to 50 mu m is done in situ, providing a custom collar with alignment pins which can be mated to a universal cookie. Lifetime measurements reveal details on aging, but operation is within CMS specifications. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Minnesota, Minneapolis, MN 55455 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Cushman, P (reprint author), Univ Minnesota, Minneapolis, MN 55455 USA. NR 3 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 11 PY 2000 VL 442 IS 1-3 BP 289 EP 294 DI 10.1016/S0168-9002(99)01236-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 303LW UT WOS:000086424200047 ER PT J AU Laporte, P Abrosimov, N Bastie, P Cordier, B Di Cocco, G Evrard, J Gizzi, L Hamelin, B Jean, P Laurent, P Paltani, P Skinner, GK Smither, RK von Ballmoos, P AF Laporte, P Abrosimov, N Bastie, P Cordier, B Di Cocco, G Evrard, J Gizzi, L Hamelin, B Jean, P Laurent, P Paltani, P Skinner, GK Smither, RK von Ballmoos, P TI CLAIRE - towards the first light for a gamma-ray lens SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2nd International Conference on New Developments in Photodetection CY JUN 21-25, 1999 CL BEAUNE, FRANCE SP Direct Sci Matiere, Inst Natl Phys Nucleaire & Phys Particules DE instrumentation for nuclear astrophysics; crystal diffraction ID CRYSTAL LENS AB The CLAIRE collaboration is presently preparing the first astronomical observation of a gamma-ray lens. In June 2000, the instrument is to be flown on a stratospheric balloon by the French Space Agency CNES. CLAIRE features a Laue diffraction lens, a detector module with a 3 x 3 germanium array, and a balloon gondola stabilized to 15 " pointing accuracy. The instruments lens focuses gamma-ray photons from its 526 cm(2) area onto a small solid-state detector, with only 18 cm(3) equivalent volume for background noise. Hence, for the first time in gamma-ray astronomy, the statistics will be dominated by the signal. Besides its excellent sensitivity, the telescope has outstanding angular and spectral resolution. The primary objective for the first balloon flight of CLAIRE is to detect the Crab nebula and measure its extend at 170 keV with an angular resolution of about I arcmin. Scientific objectives for further flights include collapsed objects, SNRs, and broad class annihilators. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Ctr Etud Spatiale Rayonnements, F-31400 Toulouse, France. Univ Birmingham, Birmingham B15 2TT, W Midlands, England. Inst Kristallzchtung, Berlin, Germany. CEA Saclay, SAp, F-91191 Gif Sur Yvette, France. TESRE, I-40129 Bologna, Italy. CNES, F-31041 Toulouse, France. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. ISDC, CH-1290 Versoix, Switzerland. Argonne Natl Lab, Argonne, IL 60439 USA. RP von Ballmoos, P (reprint author), Ctr Etud Spatiale Rayonnements, 9 Ave Colonel Roche, F-31400 Toulouse, France. RI Gizzi, Leonida/F-4782-2011; laurent, philippe/E-6211-2013; OI Gizzi, Leonida A./0000-0001-6572-6492 NR 3 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 11 PY 2000 VL 442 IS 1-3 BP 438 EP 442 DI 10.1016/S0168-9002(99)01270-X PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 303LW UT WOS:000086424200075 ER PT J AU Dickinson, M Hanley, C Elston, R Eisenhardt, PR Stanford, SA Adelberger, KL Shapley, A Steidel, CC Papovich, C Szalay, AS Bershady, MA Conselice, CJ Ferguson, HC Fruchter, AS AF Dickinson, M Hanley, C Elston, R Eisenhardt, PR Stanford, SA Adelberger, KL Shapley, A Steidel, CC Papovich, C Szalay, AS Bershady, MA Conselice, CJ Ferguson, HC Fruchter, AS TI The unusual infrared object HDF-N J123656.3+621322 SO ASTROPHYSICAL JOURNAL LA English DT Article DE early universe; galaxies : evolution; galaxies : photometry; infrared : galaxies ID HUBBLE DEEP FIELD; HIGH-REDSHIFT GALAXIES; STAR-FORMATION; LUMINOSITY FUNCTIONS; MAGELLANIC CLOUD; COLORS; SPECTROSCOPY; POPULATION; PHOTOMETRY; LIMIT AB We describe an object in the Hubble Deep Field North with very unusual near-infrared properties. It is readily visible in Hubble Space Telescope NICMOS images at 1.6 mu m and from the ground at 2.2 mu m, but it is undetected (with S/N less than or similar to 2) in very deep WFPC2 and NICMOS data from 0.3 to 1.1 mu m The f(v) flux density drops by a factor greater than or similar to 8.3 (97.7% confidence) from 1.6 to 1.1 mu m. The object is compact but may be slightly resolved in the NICMOS 1.6 mu m image. In a low-resolution, near-infrared spectrogram, we find a possible emission line at 1.643 mu m, but a reobservation at higher spectral resolution failed to confirm the line, leaving its reality in doubt. We consider various hypotheses for the nature of this object. Its colors are unlike those of known Galactic stars, except perhaps the most extreme carbon stars or Mira variables with thick circumstellar dust shells. It does not appear to be possible to explain its spectral energy distribution as that of a normal galaxy at any redshift without additional opacity from either dust or intergalactic neutral hydrogen. The colors can be matched by those of a dusty galaxy at z greater than or similar to 2, by a maximally old elliptical galaxy at z greater than or similar to 3 (perhaps with some additional reddening), or by an object at z greater than or similar to 10 whose optical and 1.1 mu m light have been suppressed by the intergalactic medium. Under the latter hypothesis, if the luminosity results from stars and not an AGN, the object would resemble a classical, unobscured protogalaxy, with a star formation rate greater than or similar to 100 M. yr(-1). Such UV-bright objects are evidently rare at 2 HI + H reaction between 1755 and 2605 K in reflected shock waves. Measured rate constants can then be expressed by k(1) = (3.92 +/- 1.15) X 10(-9) exp(-21 398 +/- 658 K/T) cm(3) molecule(-1) s(-1). Combining these results with earlier values, the rate behavior over the combined temperature range, 230 K less than or equal to T less than or equal to 2605 K, is: k(1) = (4.52 +/- 0.34) X 10(-10) exp(-17 070 +/- 34 K/T) cm(3) molecule(-1) s(-1). This result holds over similar to 30 orders of magnitude and is discussed in terms of bimolecular rate theory. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Butler Univ, Dept Chem, Indianapolis, IN 46208 USA. RP Michael, JV (reprint author), Argonne Natl Lab, Div Chem, D-193,Bldg 200, Argonne, IL 60439 USA. RI Michael, Joe/E-3907-2010 NR 29 TC 12 Z9 12 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 10 PY 2000 VL 319 IS 1-2 BP 99 EP 106 DI 10.1016/S0009-2614(00)00072-5 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 292FR UT WOS:000085783900016 ER PT J AU Christon, MA Voth, TE AF Christon, MA Voth, TE TI Results of von Neumann analyses for reproducing kernel semi-discretizations SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE reproducing kernel particle methods; meshless; dispersion ID LARGE-DEFORMATION PROBLEMS; PARTICLE METHODS AB The reproducing kernel particle method (RKPM) has many attractive properties that make it ideal for treating a broad class of physical problems. RKPM may be implemented in a 'mesh-full' or a 'mesh-free' manner and provides the ability to tune the method, via the selection of a window function and its associated dilation parameter, in order to achieve the requisite numerical performance. RKPM also provides a framework for performing hierarchical computations making it an ideal candidate for simulating multi-scale problems. Although the method has many appealing attributes, it is quite new and its numerical performance is still being quantified with respect to more traditional discretization techniques. In order to assess the numerical performance of RKPM, detailed studies of the method on a series of model partial differential equations has been undertaken. The results of von Neumann analyses for RKPM semi-discretizations of one and two-dimensional, first- and second-order wave equations are presented in the form of phase and group errors. Excellent dispersion characteristics are found for the consistent mass matrix with the proper choice of dilation parameter. In cont-rast, row-sum lumping the mass matrix is demonstrated to introduce severe lagging phase errors. A 'higher-order' mass matrix improves the dispersion characteristics relative to the lumped mass matrix but also yields significant tagging phase errors relative to the fully integrated, consistent mass matrix. Published in 2000 by John Wiley & Sons, Ltd. C1 Sandia Natl Labs, Computat Phys R&D Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Thermal Sci Dept, Albuquerque, NM 87185 USA. RP Christon, MA (reprint author), Sandia Natl Labs, Computat Phys R&D Dept, M-S 0819,POB 5800, Albuquerque, NM 87185 USA. NR 22 TC 13 Z9 13 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD MAR 10 PY 2000 VL 47 IS 7 BP 1285 EP 1301 DI 10.1002/(SICI)1097-0207(20000310)47:7<1285::AID-NME823>3.3.CO;2-V PG 17 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA 286PK UT WOS:000085454200003 ER PT J AU Danielson, KT Hao, S Liu, WK Uras, RA Li, SF AF Danielson, KT Hao, S Liu, WK Uras, RA Li, SF TI Parallel computation of meshless methods for explicit dynamic analysis SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE parallel computing; meshless methods; reproducing kernel particle methods; large deformation; inelasticity; explicit dynamics ID KERNEL PARTICLE METHODS AB A parallel computational implementation of modern meshless methods is presented for explicit dynamic analysis. The procedures are demonstrated by application of the Reproducing Kernel Particle Method (RKPM). Aspects of a coarse grain parallel paradigm are detailed for a Lagrangian formulation using model partitioning. Integration points are uniquely defined on separate processors and particle definitions are duplicated, as necessary, so that all support particles for each point are defined locally on the corresponding processor. Several partitioning schemes are considered and a reduced graph-based procedure is presented. Partitioning issues are discussed and procedures to accommodate essential boundary conditions in parallel are presented. Explicit MPI message passing statements are used for all communications among partitions on different processors. The effectiveness of the procedure is demonstrated by highly deformable inelastic example problems. Copyright (C) 2000 John Wiley & Sons, Ltd. C1 USA, Engineer Res & Dev Ctr, Waterways Expt Stn, Vicksburg, MS 39180 USA. Northwestern Univ, Dept Mech Engn, Evanston, IL 60208 USA. Northwestern Univ, Army High Performance Comp Res Ctr, Evanston, IL 60208 USA. Argonne Natl Lab, Reactor Engn Div, Argonne, IL 60439 USA. RP Danielson, KT (reprint author), USA, Engineer Res & Dev Ctr, Waterways Expt Stn, 3909 Halls Ferry Rd,CEERD-SD-R, Vicksburg, MS 39180 USA. RI Liu, Wing/B-7599-2009; Li, Shaofan/G-8082-2011 OI Li, Shaofan/0000-0002-6950-1474 NR 23 TC 19 Z9 22 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD MAR 10 PY 2000 VL 47 IS 7 BP 1323 EP 1341 DI 10.1002/(SICI)1097-0207(20000310)47:7<1323::AID-NME827>3.3.CO;2-S PG 19 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA 286PK UT WOS:000085454200005 ER PT J AU Perry, EM Warner, T Foote, P AF Perry, EM Warner, T Foote, P TI Comparison of atmospheric modelling versus empirical line fitting for mosaicking HYDICE imagery SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SURFACE AB This letter compares two approaches for determining surface reflectance from hyperspectral airborne imagery (HYDICE) radiance values, and discusses the implications for mosaicking multiple flight lines of HYDICE imagery. Empirical line correction, using calibration panels followed by histogram matching to an adjacent image, produced results comparable with that obtained from applying the ATREM model (Gao et al. 1993, Remote Sensing of Environment, 44, 165-178) to the two flight lines individually. Percentage errors were greatest for low albedo materials and for the long wavelength portions of the spectra. Overall, differences in reflectance values between adjacent frames of 2-5% in the visible/near-infrared to more than 25% in the mid-infrared can be expected. C1 Pacific NW Lab, Remote Sensing Grp, Richland, WA 99353 USA. W Virginia Univ, Dept Geol & Geog, Morgantown, WV 26506 USA. RP Perry, EM (reprint author), Pacific NW Lab, Remote Sensing Grp, POB 999 K9-55, Richland, WA 99353 USA. RI Warner, Timothy/F-1483-2010 NR 7 TC 14 Z9 17 U1 1 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD MAR 10 PY 2000 VL 21 IS 4 BP 799 EP 803 DI 10.1080/014311600210588 PG 5 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA 285LH UT WOS:000085390200013 ER PT J AU Zhou, YF Bowie, JU AF Zhou, YF Bowie, JU TI Building a thermostable membrane protein SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID COLI DIACYLGLYCEROL KINASE; ESCHERICHIA-COLI; HELIX; SOLUBILIZATION; MUTAGENESIS AB The poor stability of membrane proteins in detergent solution is one of the main technical barriers to their structural and functional characterization. Here we describe a solution to this problem for diacylglycerol kinase (DGK), an integral membrane protein from Escherichia coli. Twelve enhanced stability mutants of DGK were obtained using a simple screen. Four of the mutations were combined to create a quadruple mutant that had improved stability in a wide range of detergents. In n-octylglucoside, the wild-type DGK had a thermal inactivation half-life of 6 min at 55 degrees C, while the quadruple mutant displayed a half-life of 35 min at 80 degrees C. In addition, the quadruple mutant had improved thermodynamic stability. Our approach should be applicable to other membrane proteins that can be conveniently assayed. C1 Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Chem & Biochem, Los Angeles, CA 90095 USA. RP Bowie, JU (reprint author), Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Chem & Biochem, 405 Hilgard Ave, Los Angeles, CA 90095 USA. FU NIGMS NIH HHS [GM47485-08, GM59164-01] NR 20 TC 107 Z9 108 U1 1 U2 6 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 10 PY 2000 VL 275 IS 10 BP 6975 EP 6979 DI 10.1074/jbc.275.10.6975 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 292RV UT WOS:000085809600040 PM 10702260 ER PT J AU Raffai, R Weisgraber, KH MacKenzie, R Rupp, B Rassart, E Hirama, T Innerarity, TL Milne, R AF Raffai, R Weisgraber, KH MacKenzie, R Rupp, B Rassart, E Hirama, T Innerarity, TL Milne, R TI Binding of an antibody mimetic of the human low density lipoprotein receptor to apolipoprotein E is governed through electrostatic forces - Studies using site-directed mutagenesis and molecular modeling SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID MODULATION; PROTEINS AB Monoclonal antibody 2E8 is specific for an epitope that coincides with the binding site of the low density lipoprotein receptor (LDLR) on human apoE, Its reactivity with apoE variants resembles that of the LDLR: it binds well with apoE3 and poorly with apoE2, The heavy chain complementarity-determining region (CDRH) 2 of 2E8 shows homology to the ligand-binding domain of the LDLR, To define better the structural basis of the 2E8/apoE interaction and particularly the role of electrostatic interactions, we generated and characterized a panel of 2E8 variants, Replacement of acidic residues in the 2E8 CDRHs showed that Asp(52), Glu(53), and Asp(56) are essential for high-affinity binding. Although Asp(31) (CDRH1), Glu(58) (CDRH2), and Asp(97) (CDRH3) did not appear to be critical, the Asp(97) --> Ala variant acquired reactivity with apoE2. A Thr(57) --> Glu substitution increased affinity for both apoE3 and apoE2, The affinities of wild-type 2E8 and variants for apoE varied inversely with ionic strength, suggesting that electrostatic forces contribute to both antigen binding and isoform specificity. We propose a model of the 2E8 apoE immune complex that is based on the 2E8 and apoE crystal structures and that is consistent with the apoE-binding properties of mild-type 2E8 and its variants. Given the similarity between the LDLR and 2E8 in terms of specificity, the LDLR/ligand interaction may also have an important electrostatic component. C1 Univ Ottawa, Inst Heart, Lipoprot & Atherosclerosis Grp, Ottawa Civic Hosp, Ottawa, ON K1Y 4W7, Canada. Univ Calif San Francisco, Gladstone Inst Cardiovasc Dis, San Francisco, CA 94141 USA. Univ Calif San Francisco, Cardiovasc Res Inst, San Francisco, CA 94141 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Natl Res Council Canada, Inst Biol Sci, Ottawa, ON K1A 0R6, Canada. Univ Quebec, Dept Sci Biol, Montreal, PQ H3C 3P8, Canada. RP Milne, R (reprint author), Univ Ottawa, Inst Heart, Lipoprot & Atherosclerosis Grp, 40 Ruskin St, Ottawa, ON K1Y 4W7, Canada. FU NHLBI NIH HHS [HL 41633] NR 23 TC 13 Z9 14 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 10 PY 2000 VL 275 IS 10 BP 7109 EP 7116 DI 10.1074/jbc.275.10.7109 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 292RV UT WOS:000085809600058 PM 10702278 ER PT J AU Wenk, HR Baumgardner, JR Lebensohn, RA Tome, CN AF Wenk, HR Baumgardner, JR Lebensohn, RA Tome, CN TI A convection model to explain anisotropy of the inner core SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID X-RAY-DIFFRACTION; EARTH-CORE; HIGH-PRESSURE; TRAVEL-TIMES; TEXTURE DEVELOPMENT; THERMAL-CONVECTION; STATIC COMPRESSION; ELASTIC-ANISOTROPY; FREE OSCILLATIONS; MAGNETIC-FIELD AB Seismic evidence suggests that the solid inner core of the Earth may be anisotropic. Several models have been proposed to explain this anisotropy as the result of preferred orientation of crystals. They range from a large annealed single crystal, growth at the melt interface, to deformation-induced texture. In this study texture development by deformation during inner core convection is explored for epsilon-iron (hcp) and gamma-iron (fcc). Convection patterns for harmonic degree two were investigated in detail. In the model it is assumed that traces of potassium are uniformly dispersed in the inner core and act as a heat source. Both for fee and hcp iron, crystal rotations associated with intracrystalline slip during deformation can plausibly explain a 1-3% anisotropy in P waves with faster velocities along the N-S axis and slower ones in the equatorial plane. The effect of single crystal elastic constants is explored. C1 Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Nacl Rosario, CONICET, RA-2000 Rosario, Argentina. Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Wenk, HR (reprint author), Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA. EM wenk@seismo.berkeley.edu; baumgardner@lanl.gov; ricardo@ifir.ifir.edu.ar; tome@lanl.gov RI Lebensohn, Ricardo/A-2494-2008; Tome, Carlos/D-5058-2013 OI Lebensohn, Ricardo/0000-0002-3152-9105; NR 97 TC 33 Z9 34 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAR 10 PY 2000 VL 105 IS B3 BP 5663 EP 5677 DI 10.1029/1999JB900346 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 292AV UT WOS:000085772700006 ER PT J AU Olsson, WA AF Olsson, WA TI Origin of Luders' bands in deformed rock SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID DEFORMATION; SANDSTONE; BRITTLE; MARBLE AB Luders' bands are shear deformation features commonly observed in rock specimens that have been deformed experimentally in the brittle-ductile transition regime. For specimens that contain both faults (shear fractures that separate the specimen) and bands the bands form earlier in the deformation history, and their orientations are often different from the fault. These differences pose the question of the relationship between these two structures. Understanding the origin of these features may shed light on the genesis of apparent natural analogues and on the general process of rock deformation and fracture in the laboratory. This paper presents a hypothesis for the formation of Luders' bands in laboratory specimens based on deformation localization theory considered in the context of the nonuniform stress distribution of the conventional triaxial experiment. Luders' bands and faults appear to be equivalent reflections of the localization process as it is controlled by nonuniform distributions of stress and evolution of incremental constitutive parameters resulting from increasing damage. To relate conditions for localization in laboratory specimens to natural settings, it will be necessary to design new experiments that create uniform stress and deformation fields or to extract constitutive data indirectly from standard experiments using computational means. C1 Sandia Natl Labs, Geomech Dept, Albuquerque, NM 87185 USA. RP Olsson, WA (reprint author), Sandia Natl Labs, Geomech Dept, MS 0751, Albuquerque, NM 87185 USA. EM waolsso@sandia.gov NR 29 TC 15 Z9 15 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAR 10 PY 2000 VL 105 IS B3 BP 5931 EP 5938 DI 10.1029/1999JB900428 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 292AV UT WOS:000085772700020 ER PT J AU Polet, J Silver, PG Beck, S Wallace, T Zandt, G Ruppert, S Kind, R Rudloff, A AF Polet, J Silver, PG Beck, S Wallace, T Zandt, G Ruppert, S Kind, R Rudloff, A TI Shear wave anisotropy beneath the Andes from the BANJO, SEDA, and PISCO experiments SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SEISMIC ANISOTROPY; SUBDUCTION ZONE; MANTLE BENEATH; NAZCA PLATE; LITHOSPHERE; SKS; DEFORMATION; VELOCITY; FLOW AB We present the results of a detailed shear wave splitting analysis of data collected by three temporary broadband deployments located in central western South America: the Broadband Andean Joint experiment (BANJO), a 1000-km-long east-west line at 20 degrees S, and the Projecto de Investigacion Sismologica de la Cordillera Occidental (PISCO) and Seismic Exploration of the Deep Altiplano (SEDA), deployed several hunderd kilometers north and south of this line. We determined the splitting parameters phi (fast polarization direction) and delta t (splitting delay time) for waves that sample the above- and below-slab regions: teleseismic *KS and S, ScS waves from local deep-focus events, as well as S waves from intermediate-focus events that sample only the above-slab region. All but one of the *KS stacks for the BANJO stations show E-W fast directions with delta t varying between 0.4 and 1.5 s. However, for *KS recorded at most of the SEDA and PISCO stations, and for local deep-focus S events north and south of BANJO, there is a rotation of phi to a more nearly trench parallel direction. The splitting parameters for above-slab paths, determined from events around 200 km deep to western stations, yield small delay times (less than or equal to 0.3 a) and N-S fast polarization directions. Assuming the anisotropy is limited to the top 400 km of the mantle (olivine stability field), these data suggest the following spatial distribution of anisotropy. For the above-slab component, as one goes from east (where *KS reflects the above-slab component) to west, phi changes from E-W to N-S, and delay times are substantially reduced. This change may mark the. transition from the Brazilian craton to actively deforming (E-W shortening) Andean mantle. We see no evidence for the strain field expected for either corner flow or shear in the mantle wedge associated with relative plate motion. The small delay times for above-slab paths in the west require the existence of significant, spatially varying below-slab anisotropy to explain the *KS results. The implied anisotropic pattern below the slab is not easily explained by a simple model of slab-entrained shear flow beneath the plate. Instead, flow induced by the retrograde motion of the slab, in combination with local structural variations, may provide a better explanation. C1 CALTECH, Seismol Lab, Pasadena, CA 91125 USA. Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA. Univ Arizona, So Arizona Seism Observ, Dept Geosci, Tucson, AZ 85721 USA. Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany. RP CALTECH, Seismol Lab, Pasadena, CA 91125 USA. EM polet@gps.caltech.edu; silver@dtm.ciw.edu; beck@shock.geo.arizona.edu; wallace@geo.arizona.edu; zandt@geo.arizona.edu; kind@gfz-potsdam.de; rudloff@bgr.de RI Rudloff, Alexander/C-4939-2015 NR 33 TC 64 Z9 67 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAR 10 PY 2000 VL 105 IS B3 BP 6287 EP 6304 DI 10.1029/1999JB900326 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 292AV UT WOS:000085772700044 ER PT J AU Britt, PF Buchanan, AC Cooney, MJ Martineau, DR AF Britt, PF Buchanan, AC Cooney, MJ Martineau, DR TI Flash vacuum pyrolysis of methoxy-substituted lignin model compounds SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Review ID LOW-RANK COAL; AROMATIC CARBOXYLIC-ACIDS; PHENETHYL PHENYL ETHER; HYDROGEN-ATOM TRANSFER; O-QUINONE METHIDE; H BOND STRENGTH; THERMAL-DECOMPOSITION; RATE CONSTANTS; BENZOQUINONE METHIDE; REACTION PATHWAYS AB The Bash vacuum pyrolysis (FVP) of methoxy-substituted beta-O-4 lignin model compounds has been studied at 500 degrees C to provide mechanistic insight into the primary reaction pathways that occur under conditions of fast pyrolysis. FVP of PhCH2CH2OPh (PPE) a model of the dominance beta-O-4 Linkage in lignin, proceeds by C-O and C-C cleavage, in a 37:1 ratio, to produce styrene plus phenol as the dominant products and, minor amounts of toluene, bibenzyl, and benzaldehyde, From the deuterium isotope effect in the FVP of PhCD2CH2OPh, it was shown that C-O cleavage occurs by homolysis and by 1,2-elimination in a ratio of 1.4:1, respectively. Methoxy substituents enhance the homolysis of the beta-O-4 linkage, relative to PPE, in o-CH3O-C6H4OCH2CH2Ph (o-CN3O-PPE) and (o-CH3O)(2)-C6H3OCH2CH2Ph ((o-CH3O)(2)-PPE) by a factor of 7.4 and 21, respectively. The methoxy-substituted phenoxy radicals undergo a complex series of reactions, which are dominated by 1,5-, 1,6-, and 1,4-intramolecular hydrogen abstraction, rearrangement, and beta-scission reactions. In the FVP of o-CH3O-PPE, the dominant product, salicylaldehyde, forms from the methoxyphenoxy radical by a 1,5-hydrogen shift. to form 2-hydroxyphenoxymethyl radical, 1,2-phenyl shift, and beta-scission of a hydrogen atom. The 2-hydroxyphenoxymethyl radical can also cleave to form formaldehyde and phenol in which the ratio of 1,2-phenyl shift to beta-scission is ca, 4:1. In the FVP of o-CH3O-PPE and (o-CH3O)(2)-PPE, products (ca. 20 mol %) are also formed by C-O homolysis of the methoxy group. The resulting phenoxy radicals undergo 1,5- and 1,6-hydrogen shifts in a ratio of ca. 2:1 to the aliphatic or benzylic carbon, respectively, of the phenethyl chain. In the: FVP of (o-CH3O)(2)-PPE, o-cresol was the dominant product. It was formed by decomposition of 2-hydroxy-3-hydroxymethylbenzaldehyde and 2-hydroxybenzyl alcohol, which are formed from a complex series of reactions from the 2,6-dimethoxyphenoxy radical. The key step in this reaction sequence was the rapid 1,5-hydrogen shift from 2-hydroxy-3-methoxybenzyloxy radical to 2-hydroxymethy-6-methoxyphenoxy radical before beta-scission of a hydrogen atom to give the substituted benzaldehyde. The 2-hydroxybenzyl alcohols rapidly decompose under the reaction conditions to o-benzoquinone methide and pick up hydrogen front the reactor walls to form o-cresol. C1 Oak Ridge Natl Lab, Chem & Analyt Sci Div, Oak Ridge, TN 37831 USA. RP Britt, PF (reprint author), Oak Ridge Natl Lab, Chem & Analyt Sci Div, POB 2008, Oak Ridge, TN 37831 USA. NR 103 TC 131 Z9 140 U1 4 U2 86 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAR 10 PY 2000 VL 65 IS 5 BP 1376 EP 1389 DI 10.1021/jo991479k PG 14 WC Chemistry, Organic SC Chemistry GA 294LY UT WOS:000085913800017 PM 10814099 ER PT J AU Culler, TS Becker, TA Muller, RA Renne, PR AF Culler, TS Becker, TA Muller, RA Renne, PR TI Lunar impact history from Ar-40/Ar-39 dating of glass spherules SO SCIENCE LA English DT Article ID CALIBRATION AB Lunar spherules are small glass beads that are formed mainly as a result of small impacts on the lunar surface; the ages of these impacts can be determined by the Ar-40/Ar-39 isochron technique. Here, 155 spherules separated from 1 gram of Apollo 14 soil were analyzed using this technique. The data show that over the Last similar to 3.5 billion years, the cratering rate decreased by a factor of 2 to 3 to a low about 500 to 600 million years ago, then increased by a factor of 3.7 +/- 1.2 in the last 400 million years. This latter period coincided with rapid biotic evolutionary radiation on Earth. C1 Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Berkeley Geochronol Ctr, Berkeley, CA 94709 USA. RP Renne, PR (reprint author), Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA. NR 29 TC 116 Z9 119 U1 2 U2 13 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 10 PY 2000 VL 287 IS 5459 BP 1785 EP 1788 DI 10.1126/science.287.5459.1785 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 292BY UT WOS:000085775300032 ER PT J AU Collins, PG Bradley, K Ishigami, M Zettl, A AF Collins, PG Bradley, K Ishigami, M Zettl, A TI Extreme oxygen sensitivity of electronic properties of carbon nanotubes SO SCIENCE LA English DT Article ID GRAPHITE NANOFIBERS; ADSORPTION; HYDROGEN; STORAGE; ROPES AB The electronic properties of single-walled carbon nanotubes are shown here to be extremely sensitive to the chemical environment. Exposure to air or oxygen dramatically influences the nanotubes' electrical resistance, thermoelectric power, and Local density of states, as determined by transport measurements and scanning tunneling spectroscopy. These electronic parameters can be reversibly "tuned" by surprisingly small concentrations of adsorbed gases, and an apparently semiconducting nanotube can be converted into an apparent metal through such exposure. These results, although demonstrating that nanotubes could find use as sensitive chemical gas sensors, Likewise indicate that many supposedly intrinsic properties measured on as-prepared nanotubes may be severely compromised by extrinsic air exposure effects. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Zettl, A (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 25 TC 2108 Z9 2168 U1 55 U2 495 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 10 PY 2000 VL 287 IS 5459 BP 1801 EP 1804 DI 10.1126/science.287.5459.1801 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 292BY UT WOS:000085775300037 ER PT J AU Lucas, CA Markovic, NM Grgur, BN Ross, PN AF Lucas, CA Markovic, NM Grgur, BN Ross, PN TI Structural effects during CO adsorption on Pt-bimetallic surfaces I. The Pt(100) electrode SO SURFACE SCIENCE LA English DT Article DE bromine; carbon monoxide; copper; lead; metallic surfaces; platinum; rotating ring disk electrode (RRDE); surface structure, morphology, roughness and topography; X-ray scattering; diffraction and reflection ID X-RAY-SCATTERING; UNDERPOTENTIAL DEPOSITION; ADSORBED BROMIDE; PT(111); INTERFACE; COPPER; LEAD; DIFFRACTION; (BI)SULFATE; RELAXATION AB Synchrotron surface X-ray scattering (SXS) and rotating ring disk electrode (RRDE) measurements have been performed during the coadsorption of metal adatoms and carbon monoxide on the Pt(100) surface in an electrochemical environment. Whereas RRDE experiments give a macroscopic view of the coadsorption process, via the adsorption isotherms of deposited metal adatoms, the SXS measurements give insight into the structural changes that occur on the atomic level. The results show that both underpotentially deposited (UPD) Cu and Pb are displaced by CO from the Pt(100) surface, the driving force being the resulting negative shift in the surface free energy. When bromide is present in a c(2 x 2) structure on top of the Cu monolayer there is an activation barrier to the displacement effect. Coadsorption of CO then enhances the c(2 x 2) structure by displacing disordered Cu or Br that is present on the surface. Cycling the electrode potential, during which the Cu monolayer is desorbed, leads to complete blocking of the UPD process by CO. In contrast to these results, the reversible formation of a Bi c(2 x 2) UPD adlayer is unaffected by the presence of solution CO. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Lucas, CA (reprint author), Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. OI Grgur, Branimir/0000-0003-4684-9053; Lucas, Christopher/0000-0001-5743-3868 NR 27 TC 27 Z9 27 U1 0 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 10 PY 2000 VL 448 IS 2-3 BP 65 EP 76 DI 10.1016/S0039-6028(99)01127-9 PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 293GY UT WOS:000085844800005 ER PT J AU Lucas, CA Markovic, NM Ross, PN AF Lucas, CA Markovic, NM Ross, PN TI Structural effects during CO adsorption on Pt-bimetallic surfaces II. The Pt(111) electrode SO SURFACE SCIENCE LA English DT Article DE bromine; carbon monoxide; copper; electrochemical methods; halides; lead; low index single crustal surfaces; platinum; solid-liquid interfaces; surface structure, morphology, roughness and topography; X-ray scattering, diffraction and reflection ID X-RAY-SCATTERING; SCANNING-TUNNELING-MICROSCOPY; UNDERPOTENTIAL DEPOSITION; INFRARED-SPECTROSCOPY; ADSORBED BROMIDE; CARBON-MONOXIDE; CU; INTERFACE; COPPER; PLATINUM(111) AB The structural behavior of coadsorbed CO and metal adatoms on the Pt(111) surface in acid electrolyte has been explored by means of surface X-ray scattering (SXS) measurements to elucidate the potential-induced changes at the atomic level. Close to the Nernst potential for bulk metal deposition, CO displaces both Cu and Pb from the Pt(111) surface. In the latter case, the Pb (3 x root 3) structure, observed in CO-free solution, initially increases its surface coverage and long-range order until the Pb-CO repulsion weakens the Pb-Pt bond and displacement of Pb in the (3 x root 3) structure occurs. In the presence of bromide anions, the Cu-Br adlayer formed at negative potential is not initially displaced by CO. The energetic barrier to displacement is overcome by cycling the potential whereby Gu is desorbed from the surface and Cu UPD is then blocked by adsorbed CO. In contrast, displacement of Pb-Br by CO at negative potential occurs immediately. For both Cu-Br and Pb-Br, after displacement by CO, the p(2 x 2)-CO structure is observed at negative potential and undergoes the same potential-dependent order-disorder transition that is observed in a solution free of metal ions. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Lucas, CA (reprint author), Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. OI Lucas, Christopher/0000-0001-5743-3868 NR 27 TC 25 Z9 25 U1 0 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 10 PY 2000 VL 448 IS 2-3 BP 77 EP 86 DI 10.1016/S0039-6028(99)00958-9 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 293GY UT WOS:000085844800006 ER PT J AU Stichler, M Keller, C Heske, C Staufer, M Birkenheuer, U Rosch, N Wurth, W Menzel, D AF Stichler, M Keller, C Heske, C Staufer, M Birkenheuer, U Rosch, N Wurth, W Menzel, D TI X-ray emission spectroscopy of NO adsorbates on Ru(001) SO SURFACE SCIENCE LA English DT Article DE chemisorption; low index single crystal surface; nitrogen oxides; photon emission; ruthenium; X-ray emission ID SUBSTRATE CHEMICAL-BOND; SYNCHROTRON RADIATION; ADSORPTION; SPECTRA; CO; MULTIMETHOD; EXCITATION; COMPLEXES; DYNAMICS; NI(100) AB We report X-ray emission spectra (XES) of the WO adsorbate species on the close-packed Ru(001) surface, and discuss the basis of their interpretation. On this surface NO can exist in two distinct, very different states which coexist in the pure saturated layer and which can be prepared separately by coadsorption with selected superstructures of O atoms. We report symmetry-resolved XES data for these states, and extract atom-specific 2p contributions of adsorbate orbitals which are derived from the molecular 3 sigma, 4 sigma, 5 sigma, 1 pi, 2 pi, and 6 sigma orbitals at the O and N atoms. Their interpretation is facilitated by comparison with very recent density functional calculations [Staufer et al., J. Chem. Phys. 111 (1999) 4704] which use the frozen ground state approximation for the interpretation of the XES data. A consistent picture of the NO-Ru surface bond results which is mainly based on the allyl model, containing charge donation from the adsorbate to the substrate via mixing of the molecular 4 sigma and 5 sigma orbitals, and backdonation in the pi channels by forming a bonding 1 pi orbital and a 'lone pair' pi-type orbital on the oxygen often (somewhat misleadingly) denoted as 2 pi orbital. Finally we discuss some questions of principle for XES of adsorbates, such as the nature of the core-excited state effective in XES of chemisorbates, the influences of relaxation and screening which are neglected in frozen orbital calculations, and possible differences between the valence hole states observed in ultraviolet photoelectron spectroscopy, and in XES at different atoms. (C) 2000 Elsevier Science B.V. Ail rights reserved. C1 Tech Univ Munich, Phys Dept E20, D-85747 Garching, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Tech Univ Munich, Inst Phys & Theoret Chem, D-85747 Garching, Germany. RP Menzel, D (reprint author), Tech Univ Munich, Phys Dept E20, D-85747 Garching, Germany. RI Roesch, Notker/C-1182-2010; OI Menzel, Dietrich/0000-0002-7188-8532 NR 51 TC 12 Z9 12 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 10 PY 2000 VL 448 IS 2-3 BP 164 EP 178 DI 10.1016/S0039-6028(99)01232-7 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 293GY UT WOS:000085844800015 ER PT J AU Lahtinen, J Vaari, J Kauraala, K Soares, EA Van Hove, MA AF Lahtinen, J Vaari, J Kauraala, K Soares, EA Van Hove, MA TI LEED investigations on Co(0001): the (root 3 x root 3)R30 degrees-CO overlayer SO SURFACE SCIENCE LA English DT Article DE carbon monoxide; cobalt; low energy electron diffraction (LEED); surface structure, morphology, roughness, and; topography ID ENERGY ELECTRON-DIFFRACTION; WORK FUNCTION MEASUREMENTS; SINGLE-CRYSTAL SURFACE; AUTOMATED TENSOR LEED; PHOTOELECTRON DIFFRACTION; CARBON-MONOXIDE; STRUCTURAL DETERMINATION; INTENSITY ANALYSIS; CO; ADSORPTION AB The local adsorption structure of CO on Co(0001) has been determined at 160 K using dynamical low-energy electron diffraction (LEED). The CO molecules in the (root 3 x root 3)R30 degrees-CO overlayer adopt the on-top site with the CO axis perpendicular to the surface and induce buckling in the top Co layer pulling the Co atom beneath the CO by 0.04 +/- 0.04 Angstrom outwards. The optimum length for the CO bond is 1.17 +/- 0.06 Angstrom and that for the C-Co distance 1.78 +/- 0.06 Angstrom. The first-layer Co-Co distance is 2.04 Angstrom and thus only slightly expanded from the bulk value. The structure obtained is compared with other known CO structures on transition metals. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Helsinki Univ Technol, Phys Lab, FIN-02015 Helsinki, Finland. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. RP Lahtinen, J (reprint author), Helsinki Univ Technol, Phys Lab, POB 1100, FIN-02015 Helsinki, Finland. RI Van Hove, Michel/A-9862-2008; Lahtinen, Jouko/K-6804-2012; Soares, Edmar/C-2303-2013 OI Van Hove, Michel/0000-0002-8898-6921; Lahtinen, Jouko/0000-0002-1192-9945; NR 48 TC 45 Z9 47 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 10 PY 2000 VL 448 IS 2-3 BP 269 EP 278 DI 10.1016/S0039-6028(99)01228-5 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 293GY UT WOS:000085844800025 ER PT J AU Baer, T Song, Y Ng, CY Liu, JB Chen, WW AF Baer, T Song, Y Ng, CY Liu, JB Chen, WW TI The heat of formation of 2-C3H7+ and proton affinity of C3H6 determined by pulsed field ionization-photoelectron photoion coincidence spectroscopy SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID RYDBERG STATES; ENERGY; FRAGMENTATION; RESOLUTION; LIFETIMES; MOLECULES; SCALE; BEAM AB Pulsed field ionization combined with ion coincidence has been used with synchrotron radiation at the Advance Light Source (ALS) operated in the multibunch mode to energy select ions and to measure their breakdown diagram. The resolution for ion state selection achieved with Ar on this instrument is 0.6 meV. The production of the 2-C3H7+ ion was investigated by measuring the dissociative ionization onset from the 2-propyl chloride, bromide, and iodide. Because the dissociation limits for halogen atom loss lie in the Franck-Condon gap, the yield of threshold electrons generated by pulsed field ionization was found to be extremely low. Nevertheless, the heat of formation of 2-C3H7+ determined from the three molecules agreed to within 2 kJ/mol. The average and now recommended values for this heat of formation are 825.0 +/- 1.5 kJ/mol (0 K) and 807.5 +/- 1.5 kJ/mol (298 K). This can be combined with the known heats of formation of C3H6 and H+ to yield a proton affinity of C3H6 of 742.3 +/- 1.5 kJ/mol (298 K). This new value, which is 9.3 kJ/mol lower than the recommended value of Hunter and Lias, is in much better agreement with two theoretical values (744 kJ/mol) as well as the determination of Szulejko and McMahon (746.4 kJ/mol). C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. US DOE, Ames Lab, Ames, IA 50011 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Baer, T (reprint author), Univ N Carolina, Dept Chem, CB 3290, Chapel Hill, NC 27599 USA. NR 44 TC 27 Z9 27 U1 3 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 9 PY 2000 VL 104 IS 9 BP 1959 EP 1964 DI 10.1021/jp993244i PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 291ZV UT WOS:000085770400023 ER PT J AU Zygmunt, SA Curtiss, LA Zapol, P Iton, LE AF Zygmunt, SA Curtiss, LA Zapol, P Iton, LE TI Ab initio and density functional study of the activation barrier for ethane cracking in cluster models of zeolite H-ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID NONCLASSICAL CARBONIUM-IONS; CATALYTIC TRANSFORMATIONS; HARTREE-FOCK; CONVERSION; HZSM-5; MECHANISMS; PARAFFINS AB Protolytic cracking of ethane in zeolites has been investigated using quantum-chemical techniques and a cluster model of the zeolite acid site. An aluminosilicate cluster model containing five tetrahedral (Si, Al) atoms (5T) was used to locate all of the stationary points along a reaction path fur ethane cracking at the HF/6-31G(d), B3LYP/6-31 G(d), and MP2(FC)/6-31 G(d) levels of theory. The cracking reaction occurs via a protonated structure that is a carbonium-like ion and is a transition state on the potential energy surface. The activation barrier for cracking calculated at each level of theory was refined by including (i) vibrational energies at the experimental reaction temperature of 773 K, (ii) electron correlation and/or all extended basis set at the B3LYP/6-311+G(3df,2p) or MP2(FC)/6-311+G(3df,2p) levels, and (iii) the influence of the surrounding zeolite lattice from a 58T cluster model of the zeolite H-ZSM-5. The barrier is especially sensitive to the long-range electrostatic effect of the lattice, which reduces it by 14.5 kcal/mol from the value obtained with the 5T cluster. The final calculated barrier of 54.1 kcal/mol at the MP2(FC)/6-311+G(3df,2p)//MP2(FC)/6-31G(d) level, including corrections, is significantly smaller than values obtained by previous theoretical studies and is in reasonable agreement with typical experimental values for short alkanes. The other levels of theory give similar values for the barrier. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Valparaiso Univ, Dept Phys & Astron, Valparaiso, IN 46383 USA. RP Curtiss, LA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM stan.zygmunt@valpo.edu; curtiss@anl.gov RI Zapol, Peter/G-1810-2012 OI Zapol, Peter/0000-0003-0570-9169 NR 28 TC 82 Z9 82 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 9 PY 2000 VL 104 IS 9 BP 1944 EP 1949 DI 10.1021/jp993194h PG 6 WC Chemistry, Physical SC Chemistry GA 291ZT UT WOS:000085770200007 ER PT J AU Chen, LX Jager, WJH Gosztola, DJ Niemczyk, MP Wasielewski, MR AF Chen, LX Jager, WJH Gosztola, DJ Niemczyk, MP Wasielewski, MR TI Ionochromic effects and structures of metalated poly(p-phenylenevinylene) polymers incorporating 2,2 '-bipyridines SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID TRANSFER EXCITED-STATES; CONJUGATED POLYMERS; COMPLEXES; LIGAND; TRANSITIONS; ABSORPTION; SEPARATION AB The effects of metal ion chelation to the 2,2'-bipyridine (bpy) groups on the photophysics and exciton dynamics of two conjugated polymers 1 and 2 in solution are investigated. The structures of polymers 1 and 2 have 2,2'-bipyridyl-5-vinylene units that alternate with one and three 2,5-bis(n-decyloxy)-1,4-phenylenevinylene monomer units, respectively. The photophysics and exciton dynamics of metalated polymers 1 and 2 are compared to those of the metal-free polymers (Chen ct al. J. Phys. Chem. A 1999, 103, 4341-4351). The origins of ionochromic effects due the metal ion chelation were studied using both steady-state and transient optical spectroscopy, and the results indicate that both conformational flattening and participation of Jr electrons from the metal in the pi-conjugation of the polymer backbone play important roles in metal ion binding induced red shifts in absorption and photoluminescence spectra. The photoluminescence properties of the metalated polymers are determined by the metal ion electronic structures, where the closed shell Zn2+-bound polymer 2 has an increased photolumincscence quantum yield and the corresponding open shell Ni2+- or Fe3+-bound polymers have quenched photoluminesccnce due to spin-orbit coupling. The dual character of metalated polymer 2 as a conjugated polymer and as a metal-bpy complex is discussed. In addition, the structures of metal ion binding sites are studied via X-ray absorption fine structure (XAFS) and are related to the photophysical properties of the metalated polymers. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. RP Chen, LX (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 36 TC 59 Z9 61 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 9 PY 2000 VL 104 IS 9 BP 1950 EP 1960 DI 10.1021/jp993365i PG 11 WC Chemistry, Physical SC Chemistry GA 291ZT UT WOS:000085770200008 ER PT J AU van de Lagemaat, J Park, NG Frank, AJ AF van de Lagemaat, J Park, NG Frank, AJ TI Influence of electrical potential distribution, charge transport, and recombination on the photopotential and photocurrent conversion efficiency of dye-sensitized nanocrystalline TiO2 solar cells: A study by electrical impedance and optical modulation techniques SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID ELECTRONIC TRANSPORT; SPECTROSCOPY; ABSORPTION; INJECTION; LIGHT AB The role of electrical potential, charge transport, and rt combination in determining the photopotential and photocurrent conversion efficiency (IPCE) of dye-sensitized nanocrystalline solar cells was studied. Electrostatic arguments and electrical impedance spectroscopy (EIS) are used to obtain information on the electrical and electrochemical potential distribution in the cell. It is shown that on the macroscopic level, no significant electrical potential drop exists within the porous TiO2 when it contacts the electrolyte and that the electrical potential drop at the transparent conducting oxide substrate (TCO)/TiO2 interface occurs over a narrow region, one or two layers of TiO2. Analyses of EIS and other data indicate that both the photopotential of the cell and the decrease of the electrical potential drop across the TCO/TiO2 interface are caused by the buildup of photoinjected electrons in the TiO2 film. The time constants for the recombination and collection of the photoinjected electrons are measured by EIS and intensity-modulated photocurrent spectroscopy (IMPS). As the applied bias is varied from short-circuit to open-circuit conditions at 1 sun light intensity, recombination becomes faster, the collection of electrons becomes slower, and the IPCE decreases. The decrease of IPCE correlates directly with the decline of the charge-collection efficiency eta(cc) which is obtained from the time constants for the recombination and collection of the photoinjected electrons. Significantly, at open circuit, eta(cc) is only 45% of its short-circuit value, indicating that the dye-sensitized nanocrystalline TiO2 solar cell behaves as a nonideal photodiode. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP van de Lagemaat, J (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. RI van de Lagemaat, Jao/J-9431-2012; Wei, Zhanhua/D-7544-2013; Park, Nam-Gyu/F-2477-2014 OI Wei, Zhanhua/0000-0003-2687-0293; NR 42 TC 555 Z9 555 U1 16 U2 172 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 9 PY 2000 VL 104 IS 9 BP 2044 EP 2052 DI 10.1021/jp993172v PG 9 WC Chemistry, Physical SC Chemistry GA 291ZT UT WOS:000085770200019 ER PT J AU Zurek, WH AF Zurek, WH TI Quantum cloning - Schrodinger's sheep SO NATURE LA English DT Editorial Material C1 Univ Calif Los Alamos Natl Lab, Div Theory, Los Alamos, NM 87545 USA. RP Zurek, WH (reprint author), Univ Calif Los Alamos Natl Lab, Div Theory, T-6 MS B288, Los Alamos, NM 87545 USA. NR 12 TC 17 Z9 19 U1 1 U2 6 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 9 PY 2000 VL 404 IS 6774 BP 130 EP 131 DI 10.1038/35004684 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 293UC UT WOS:000085870900027 PM 10724148 ER PT J AU Ahle, L Akiba, Y Ashktorab, K Baker, MC Beavis, D Budick, B Chang, J Chasman, C Chen, Z Chu, YY Chujo, T Cumming, J Debbe, R Dunlop, JC Eldredge, W Fleming, K Fung, SY Garcia, E Gushue, S Hamagaki, H Hayano, R Heintzelman, GH Kang, JH Kim, EJ Kumagai, A Kurita, K Lee, JH Lee, YK Miake, Y Mignerey, AC Moulson, M Muentz, C Nagano, K Ogilvie, CA Olness, J Oyama, K Remsberg, L Sako, H Seto, R Shea, J Shigaki, K Steadman, SG Stephans, GSF Tamagawa, T Tannenbaum, MJ Ueno-Hayashi, S Videbaek, F Xiang, H Wang, F Yagi, K Zhu, F Back, BB Betts, RR Chang, J Chang, WC Chi, CY Chu, YY Cumming, JB Dunlop, JC Eldredge, W Fung, SY Ganz, R Garcia, E Gillitzer, A Heintzelman, GH Henning, WF Hofmann, DJ Holzman, B Kang, JH Kim, EJ Kim, SY Kwon, Y McLeod, D Mignerey, AC Moulson, M Nanal, V Ogilvie, CA Pak, R Ruangma, A Russ, D Seto, R Stanskas, PJ Stephans, GSF Wang, H Wolfs, FLH Wuosmaa, AH Xiang, H Xu, GH Yao, HB Zou, CM AF Ahle, L Akiba, Y Ashktorab, K Baker, MC Beavis, D Budick, B Chang, J Chasman, C Chen, Z Chu, YY Chujo, T Cumming, J Debbe, R Dunlop, JC Eldredge, W Fleming, K Fung, SY Garcia, E Gushue, S Hamagaki, H Hayano, R Heintzelman, GH Kang, JH Kim, EJ Kumagai, A Kurita, K Lee, JH Lee, YK Miake, Y Mignerey, AC Moulson, M Muentz, C Nagano, K Ogilvie, CA Olness, J Oyama, K Remsberg, L Sako, H Seto, R Shea, J Shigaki, K Steadman, SG Stephans, GSF Tamagawa, T Tannenbaum, MJ Ueno-Hayashi, S Videbaek, F Xiang, H Wang, F Yagi, K Zhu, F Back, BB Betts, RR Chang, J Chang, WC Chi, CY Chu, YY Cumming, JB Dunlop, JC Eldredge, W Fung, SY Ganz, R Garcia, E Gillitzer, A Heintzelman, GH Henning, WF Hofmann, DJ Holzman, B Kang, JH Kim, EJ Kim, SY Kwon, Y McLeod, D Mignerey, AC Moulson, M Nanal, V Ogilvie, CA Pak, R Ruangma, A Russ, D Seto, R Stanskas, PJ Stephans, GSF Wang, H Wolfs, FLH Wuosmaa, AH Xiang, H Xu, GH Yao, HB Zou, CM CA E866 Collaboration E917 Collaboration TI Excitation function of K+ and pi(+) production in Au plus Au reactions at 2-10 AGeV SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; HADRONIC MATTER; GEV/C AB Positive pion and kaon production from Au + An reactions have been measured as a function of beam energy over the range 2.0-10.7 AGeV. Both the kaon and the pion production cross-sections at mid-rapidity are observed to increase steadily with beam kinetic energy. The ratio of K+ to pi(+) mid-rapidity yields increases from 0.0271 +/- 0.0015 +/- 0.0014 at 2.0 AGeV to 0.202 +/- 0.005 +/- 0.010 at 10.7 AGeV and is larger than the K+/pi(+) ratio From p + p reactions over the same beam energy region. There is no indication of a strong onset of any neu production mechanism in heavy-ion reactions in this energy range beyond rescattering of hadrons. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Columbia Univ, Nevis Labs, Irvington, NY 10533 USA. KEK, High Energy Accelerator Res Org, Tanashi Branch, Tanashi, Tokyo 188, Japan. KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan. Johns Hopkins Univ, Baltimore, MD USA. Univ Maryland, College Pk, MD 20742 USA. MIT, Cambridge, MA 02139 USA. NYU, New York, NY USA. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Univ Tokyo, Sch Sci, Ctr Nucl Study, Tanashi, Tokyo 188, Japan. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Yonsei Univ, Seoul 120749, South Korea. Argonne Natl Lab, Argonne, IL 60439 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Columbia Univ, Nevis Labs, Irvington, NY 10533 USA. Univ Illinois, Chicago, IL 60607 USA. Univ Maryland, College Pk, MD 20742 USA. MIT, Cambridge, MA 02139 USA. Univ Rochester, Rochester, NY 14627 USA. Yonsei Univ, Seoul 120749, South Korea. RP Ahle, L (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI Mignerey, Alice/D-6623-2011; seto, richard/G-8467-2011; Cumming, James/I-3358-2013; Hayano, Ryugo/F-7889-2012; HAMAGAKI, HIDEKI/G-4899-2014 OI Cumming, James/0000-0001-6930-0958; Hayano, Ryugo/0000-0002-1214-7806; NR 24 TC 118 Z9 122 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 9 PY 2000 VL 476 IS 1-2 BP 1 EP 8 DI 10.1016/S0370-2693(00)00037-X PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 294JL UT WOS:000085908100001 ER PT J AU Woodward, CS Dawson, CN AF Woodward, CS Dawson, CN TI Analysis of expanded mixed finite element methods for a nonlinear parabolic equation modeling flow into variably saturated porous media SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE error estimates; mixed finite elements; nonlinear; degenerate parabolic equation; porous media; Richards' equation ID ELLIPTIC PROBLEMS; NUMERICAL-METHODS; SOILS AB We present an analysis of expanded mixed finite element methods applied to Richards' equation, a nonlinear parabolic partial differential equation modeling the flow of water into a variably saturated porous medium. We consider the full range of saturated to completely unsaturated media. In the case of the lowest order Raviart-Thomas spaces and the range of all possible saturations, we bound the H+1-norm of the error in capacity in terms of approximation error. This estimate uses a time-integrated scheme and the Kirchhoff transformation to handle a degeneracy in the case of completely unsaturated flow. Optimal convergence is then shown for a nonlinear form related to the error in the capacity for the case of saturated to partially saturated flow. Convergence rates depending on the Holder continuity of the capacity term are derived. Last, optimal convergence of pressures and fluxes is stated for the case of strictly partially saturated flow. C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. Univ Texas, Texas Inst Computat & Appl Math, Austin, TX 78712 USA. RP Woodward, CS (reprint author), Univ Calif Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA. RI Woodward, Carol/M-4008-2014 NR 17 TC 59 Z9 60 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD MAR 9 PY 2000 VL 37 IS 3 BP 701 EP 724 DI 10.1137/S0036142996311040 PG 24 WC Mathematics, Applied SC Mathematics GA 298JR UT WOS:000086136000001 ER PT J AU Wiegmann, A Bube, KP AF Wiegmann, A Bube, KP TI The explicit-jump immersed interface method: Finite difference methods for PDEs with piecewise smooth solutions SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE elliptic boundary value problems; immersed interface method; Cartesian grid; nonsmooth solutions; irregular domain; interface; singular source; discontinuous coefficients; finite difference methods ID DISCONTINUOUS COEFFICIENTS; SINGULAR SOURCES; EQUATIONS AB Many boundary value problems (BVPs) or initial BVPs have nonsmooth solutions, with jumps along lower-dimensional interfaces. The explicit-jump immersed interface method (EJIIM) was developed following Li's fast iterative immersed interface method (FIIIM), recognizing that the foundation for the efficient solution of many such problems is a good solver for elliptic BVPs. EJIIM generalizes the class of problems for which FIIIM is applicable. It handles interfaces between constant and variable coefficients and extends the immersed interface method (IIM) to BVPs on irregular domains with Neumann and Dirichlet boundary conditions. Proofs of second order convergence for a one-dimensional (1D) problem with piecewise constant coefficients and for two-dimensional (2D) problems with singular sources are given. Other problems are reduced to the singular sources case, with additional equations determining the source strengths. The advantages of EJIIM are high quality of solutions even on coarse grids and easy adaptation to many problems with complicated geometries, while still maintaining the efficiency of the FIIIM. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Math, Berkeley, CA 94720 USA. Univ Washington, Dept Math, Seattle, WA 98195 USA. RP Wiegmann, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Math, Mail Stop 50A-2152,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 18 TC 110 Z9 110 U1 0 U2 10 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD MAR 9 PY 2000 VL 37 IS 3 BP 827 EP 862 DI 10.1137/S0036142997328664 PG 36 WC Mathematics, Applied SC Mathematics GA 298JR UT WOS:000086136000007 ER PT J AU Shvartsburg, AA Liu, B Jarrold, MF Ho, KM AF Shvartsburg, AA Liu, B Jarrold, MF Ho, KM TI Modeling ionic mobilities by scattering on electronic density isosurfaces: Application to silicon cluster anions SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RESOLVED PHOTOELECTRON-SPECTRA; SODIUM-CHLORIDE NANOCRYSTALS; SIZED SI CLUSTERS; GAS-PHASE; CARBON CLUSTERS; SEMICONDUCTOR CLUSTERS; STRUCTURAL TRANSITIONS; FINITE-TEMPERATURE; BINARY CLUSTERS; ENERGY AB We have developed a new formalism to evaluate the gas-phase mobility of an ion based on elastic scattering on an electronic density isosurface (SEDI). In this method, the ion is represented by a surface of arbitrary shape defined as a set of points in space where the total electron density assumes a certain value. This value is the only adjustable parameter in the model. Conceptually, this treatment emulates the interaction between a drifting ion and the buffer gas atoms closer than the previously described methods, the exact hard spheres scattering (EHSS) model and trajectory calculations, where the scattering occurs in potentials centered on the nuclei. We have employed EHSS, trajectory calculations, and SEDI to compute the room temperature mobilities for low-energy isomers of Si-n (n less than or equal to 20) cations and anions optimized by density functional theory (DFT) in the local density approximation and generalized gradient approximation. The results produced by SEDI are in excellent agreement with the measurements for both charge states, while other methods can fit the mobilities for cations only. Using SEDI, we have confirmed the structural differences between Si-n(+) and Si-n(-) predicted by DFT calculations, including the major rearrangements for n = 9, 15, 16, and 18. We have also assigned the multiple isomers observed in recent high-resolution mobility measurements for Si-n(+) with n = 17-19, some of them to near-spherical cage-like geometries. (C) 2000 American Institute of Physics. [S0021-9606(00)01104-1]. C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Shvartsburg, AA (reprint author), York Univ, Dept Chem, 4700 Keele St, N York, ON M3J 1P3, Canada. NR 90 TC 111 Z9 111 U1 0 U2 14 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 8 PY 2000 VL 112 IS 10 BP 4517 EP 4526 DI 10.1063/1.481042 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 288LG UT WOS:000085563800010 ER PT J AU Wang, XB Wang, LS AF Wang, XB Wang, LS TI Probing the electronic structure and metal-metal bond of Re2Cl82- in the gas phase SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ENERGY PHOTOELECTRON-SPECTROSCOPY; MULTIPLY-CHARGED ANIONS; QUADRUPLE BONDS; IONIZATION; COMPLEXES; SPECTRA; RU2(O2CCF3)4(NO)2; MO2(O2CCH3)4 AB Re2Cl82-, the classical metal complex with a metal-metal multiple bond, was observed in the gas phase for the first time using electrospray. Photodetachment photoelectron spectroscopy (PES) was used to probe its electronic structure, metal-metal bonding, and gas-phase molecular properties. The PES spectra provide a unique and direct picture about the occupied molecular orbitals (MOs) of Re2Cl82-. Detachments from the metal-metal and metaI-ligand bonding MOs were clearly observed and distinguished We found that the metal-metal bonding MOs from the d orbitals (delta, pi, and sigma) have low electron binding energies and yielded three well-resolved detachment bands. The metal-ligand or pure Ligand MOs all have higher binding energies and give congested PES features. The ground state of Re2Cl82- with a configuration of ...sigma(2)pi(2)delta(2) and a formal quadruple Re-Re bond is unequivocally confirmed. The PES spectra yielded a 1.00 eV adiabatic binding energy for the second excess electron in the doubly charged anion. The magnitude of the intramolecular Coulomb repulsion was estimated to be similar to 2.3 eV using photon-energy-dependent PES spectra. Despite its electronic stability, Re2Cl82- was found to be metastable against the loss of a Cl- in the gas phase, suggesting that the Re-Cl bond strength is less than 2.3 eV. 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, 2710 Univ Dr, Richland, WA 99352 USA. NR 44 TC 27 Z9 27 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 8 PY 2000 VL 122 IS 9 BP 2096 EP 2100 DI 10.1021/ja994200q PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA 294ME UT WOS:000085914400031 ER PT J AU Eisenberg, D Gill, HS Pfluegl, GMU Rotstein, SH AF Eisenberg, D Gill, HS Pfluegl, GMU Rotstein, SH TI Structure-function relationships of glutamine synthetases SO BIOCHIMICA ET BIOPHYSICA ACTA-PROTEIN STRUCTURE AND MOLECULAR ENZYMOLOGY LA English DT Review DE glutamine synthetase; kinetic study; feedback inhibition; structural study; mechanism of action ID GAMMA-SUBSTITUTED PHOSPHINOTHRICINS; PHOSPHORYL TRANSFER-REACTIONS; METHIONINE-S-SULFOXIMINE; ESCHERICHIA-COLI; ACTIVE-SITE; CRYSTAL-STRUCTURES; SALMONELLA-TYPHIMURIUM; MAMMALIAN BRAIN; OVINE BRAIN; METAL-IONS AB As a highly regulated enzyme at the core of nitrogen metabolism, glutamine synthetase has been studied intensively. We review structural and functional studies of both bacterial and eukaryotic glutamine synthetases, with emphasis on enzymatic inhibitors. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Chem, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Biochem, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Biol Chem, Los Angeles, CA 90095 USA. RP Eisenberg, D (reprint author), Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Dept Chem, 201 MBI,Box 951570, Los Angeles, CA 90095 USA. NR 138 TC 199 Z9 204 U1 5 U2 30 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-4838 J9 BBA-PROTEIN STRUCT M JI Biochim. Biophys. Acta-Protein Struct. Molec. Enzym. PD MAR 7 PY 2000 VL 1477 IS 1-2 BP 122 EP 145 DI 10.1016/S0167-4838(99)00270-8 PG 24 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 295ZL UT WOS:000085998500012 PM 10708854 ER PT J AU Bern, Z Dixon, L Dunbar, DC Perelstein, M Rozowsky, JS AF Bern, Z Dixon, L Dunbar, DC Perelstein, M Rozowsky, JS TI Perturbative relations between gravity and gauge theory SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article; Proceedings Paper CT STRINGS'99 Conference CY JUL 19-24, 1999 CL POTSDAM, GERMANY SP Max Planck Soc, German Amer Acad Council, DAAK, Deutsch Forsch Gemeinschaft, Minist Wissenschaft, Forsch & Kultur Land Brandenburg, WE-Hereaus Stiftung, Humboldt Univ ID ONE-LOOP DIVERGENCES; YANG-MILLS; MULTIPLE BREMSSTRAHLUNG; HELICITY AMPLITUDES; EINSTEIN; SUPERGRAVITY; SUPERSYMMETRY; SYSTEM AB We review the relations that have been found between multi-loop scattering amplitudes in gauge theory and gravity, and their implications for ultraviolet divergences in supergravity. C1 Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Univ Wales, Dept Phys, Swansea SA2 8PP, W Glam, Wales. Univ Florida, Dept Phys, Inst Fundamental Theory, Gainesville, FL 32611 USA. RP Bern, Z (reprint author), Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA. OI dunbar, david/0000-0003-2433-1675 NR 49 TC 19 Z9 19 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0264-9381 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD MAR 7 PY 2000 VL 17 IS 5 BP 979 EP 988 DI 10.1088/0264-9381/17/5/307 PG 10 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 297VV UT WOS:000086104100008 ER PT J AU Kachru, S Kumar, J Silverstein, E AF Kachru, S Kumar, J Silverstein, E TI Orientifolds, renormalization-group flows and closed string tachyons SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article; Proceedings Paper CT STRINGS'99 Conference CY JUL 19-24, 1999 CL POTSDAM, GERMANY SP Max Planck Soc, German Amer Acad Council, DAAK, Deutsch Forsch Gemeinschaft, Minist Wissenschaft, Forsch & Kultur Land Brandenburg, WE-Hereaus Stiftung, Humboldt Univ ID ORBIFOLDS; DUALITY; SOLITONS AB We discuss the fate of certain tachyonic closed string theories from two perspectives. In both cases our approach involves directly studying configurations with a finite negative tree-level cosmological constant. Closed string analogues of orientifolds, which carry negative tension, are argued to represent the minima of the tachyon potential in some cases. In other cases, we make use of the fact, noted in the early string theory literature, that strings can propagate on spaces of subcritical dimension at the expense of introducing a tree-level cosmological constant. The form of the tachyon vertex operator in these cases makes it clear that a subcritical-dimension theory results from tachyon condensation. Using results of Kutasov, we argue that in some Scherk-Schwarz models, for finery tuned tachyon condensates, a minimal model CFT times a subcritical dimension theory results. In some instances, these two sets of ideas may be related by duality. C1 Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kachru, S (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA. NR 63 TC 18 Z9 18 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0264-9381 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD MAR 7 PY 2000 VL 17 IS 5 BP 1139 EP 1150 DI 10.1088/0264-9381/17/5/323 PG 12 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 297VV UT WOS:000086104100024 ER PT J AU Ooguri, H AF Ooguri, H TI Wilson loops in large-N theories SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article; Proceedings Paper CT STRINGS'99 Conference CY JUL 19-24, 1999 CL POTSDAM, GERMANY SP Max Planck Soc, German Amer Acad Council, DAAK, Deutsch Forsch Gemeinschaft, Minist Wissenschaft, Forsch & Kultur Land Brandenburg, WE-Hereaus Stiftung, Humboldt Univ ID HYPERBOLIC SPACE AB We discuss how various aspects of Wilson loops in large-N gauge theories are studied from the point of view of the AdS-CFT correspondence. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Theory Grp, Berkeley, CA 94720 USA. RP Ooguri, H (reprint author), Univ Calif Berkeley, Dept Phys, 366 Le Conte Hall, Berkeley, CA 94720 USA. RI Ooguri, Hirosi/A-4407-2011 NR 27 TC 3 Z9 3 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0264-9381 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD MAR 7 PY 2000 VL 17 IS 5 BP 1225 EP 1233 DI 10.1088/0264-9381/17/5/331 PG 9 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 297VV UT WOS:000086104100032 ER PT J AU Qiu, SR Lai, HF Roberson, MJ Hunt, ML Amrhein, C Giancarlo, LC Flynn, GW Yarmoff, JA AF Qiu, SR Lai, HF Roberson, MJ Hunt, ML Amrhein, C Giancarlo, LC Flynn, GW Yarmoff, JA TI Removal of contaminants from aqueous solution by reaction with iron surfaces SO LANGMUIR LA English DT Article ID SCANNING TUNNELING MICROSCOPY; ZERO-VALENT IRON; IN-SITU REMEDIATION; GROUNDWATER; ADSORPTION; INTERFACE; METALS AB Irrigation drainage and industrial wastewaters often contain elevated levels of toxic oxyanions and oxycations such as selenate, chromate, and uranyl. A potential remediation method is to react contaminated water with zero-valent iron, which transforms the mobile contaminants into immobile forms. In this work, iron foil was exposed to aqueous solutions containing the relevant ions, and the reacted surfaces were characterized by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). STM images collected in situ show that the protrusions on the foil surface associated with iron oxides are smoothed out by the reaction. XPS indicates that partially reduced Se(IV) and Cr(III) are adsorbed on the surface, while uranium is deposited as U(VI), i.e., without reduction. More Se and Cr are deposited when the atmospheric gases are removed from solution because of the elimination of a competing process in which dissolved O-2 increases the thickness of the iron oxide overlayer to the point where the reduction reaction is quenched. The amount of U deposited is greatly increased when the atmospheric gases are removed because of the elimination of dissolved CO2, which can form carbonate complexes with uranium. C1 Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Columbia Univ, Dept Chem, New York, NY 10027 USA. Columbia Univ, Columbia Radiat Lab, New York, NY 10027 USA. RP Yarmoff, JA (reprint author), Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. NR 32 TC 83 Z9 84 U1 5 U2 31 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAR 7 PY 2000 VL 16 IS 5 BP 2230 EP 2236 DI 10.1021/la990902h PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 290NB UT WOS:000085681300028 ER PT J AU Slep, D Asselta, J Rafailovich, MH Sokolov, J Winesett, DA Smith, AP Ade, H Anders, S AF Slep, D Asselta, J Rafailovich, MH Sokolov, J Winesett, DA Smith, AP Ade, H Anders, S TI Effect of an interactive surface on the equilibrium contact angles in bilayer polymer films SO LANGMUIR LA English DT Article ID POLYSTYRENE; INTERFACES; BEHAVIOR; BLENDS; MELTS AB Scanning transmission X-ray microscopy (STXM), atomic force microscopy (AFM), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and photoemission electron microscopy (PEEM) were used to obtain the three-dimensional concentration profiles and the late-stage morphology of liquid bilayer thin films of the two imiscible polymers polystyrene (PS) and (polybromostyrene) (PBrx=0.79S), where x fraction of monomers brominated) as a function of the lower PS film thickness. The results showed that the apparent contact angle at the polymer/air interface decreases exponentially with increasing PS film thickness with a constant that scales with the PS radius of gyration (R-g) In contrast, the Neuman angle, as determined from the PBrS STXM images, increases with substrate thickness. NEXAFS and PEEM data show that the droplets consist of a PBrS core fully encapsulated by PS for substrate thicknesses greater than R-g. Only partial encapsulation is seen for substrates less than R-g. These results could not be explained with existing models developed for bulk viscoelastic fluids. We found that, for the case of entangled polymers, other factors such as the interfacial energy with the substrate, the film thickness, and the molecular weights must be considered. A model which includes a restoring force characterizing the change in stiffness of the substrate layer due to surface interactions provided good agreement with the experimental observations. C1 Hilord Chem Corp, New York, NY 11788 USA. SUNY Stony Brook, Dept Mat Sci, Stony Brook, NY 11794 USA. N Carolina State Univ, Dept Phys, Raleigh, NC 27596 USA. Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Rafailovich, MH (reprint author), Hilord Chem Corp, New York, NY 11788 USA. RI Ade, Harald/E-7471-2011; Raoux, Simone/G-3920-2016 NR 26 TC 31 Z9 31 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD MAR 7 PY 2000 VL 16 IS 5 BP 2369 EP 2375 DI 10.1021/la990031b PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 290NB UT WOS:000085681300048 ER PT J AU Kumar, SR Renusch, DP Grimsditch, M AF Kumar, SR Renusch, DP Grimsditch, M TI Effect of molecular orientation on the elastic constants of polypropylene SO MACROMOLECULES LA English DT Article ID ISOTACTIC POLYPROPYLENE; DEFORMATION AB The Brillouin spectroscopic measurements of elastic properties of polypropylene films fabricated by different processing techniques are described. We find that the elastic symmetry and the associated elastic constants are dependent on the molecular orientation brought about by the processing conditions used to produce the films. We have shown that Brillouin scattering techniques can successfully be used to track the molecular orientation induced by uniaxial stretching. We find a direct correspondence between the Brillouin measurements and optical birefringence measurements, illustrating that molecular orientation plays a dominant role in determining the mechanical anisotropy in these materials. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA. RP Kumar, SR (reprint author), Amoco Chem New Business R&D, Naperville, IL 60566 USA. NR 20 TC 4 Z9 4 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 7 PY 2000 VL 33 IS 5 BP 1819 EP 1826 DI 10.1021/ma9906579 PG 8 WC Polymer Science SC Polymer Science GA 293BY UT WOS:000085832700056 ER PT J AU Genzer, J Sivaniah, E Kramer, EJ Wang, JG Korner, H Xiang, ML Char, K Ober, CK DeKoven, BM Bubeck, RA Chaudhury, MK Sambasivan, S Fischer, DA AF Genzer, J Sivaniah, E Kramer, EJ Wang, JG Korner, H Xiang, ML Char, K Ober, CK DeKoven, BM Bubeck, RA Chaudhury, MK Sambasivan, S Fischer, DA TI The orientation of semifluorinated alkanes attached to polymers at the surface of polymer films SO MACROMOLECULES LA English DT Article ID BLOCK-COPOLYMERS; MONOLAYERS; NEXAFS AB The surface molecular orientation of a liquid crystalline (LC) layer made up of semifluorinated (SF) single side groups [-CO-(CH2)(x-1)-(CF2)(y)F] (single SF groups) attached to polyisoprene homopolymer or the isoprene block of a styrene-isoprene diblock copolymer was determined by analyzing the partial electron yield C-edge NEXAFS signal. The results show that the surfaces of thin SF polymer films are covered with a uniform layer, consisting of the SF-LC groups whose average -CF2- tilt angle with the surface normal lies in the range 29-46 degrees. This is in direct contrast to the bulk, where the directors of the SF-LC mesogens are aligned parallel to the polystyrene/SF-polyisoprene interface of the block copolymers. This average tilt angle increases with increasing the length of the -(CH2)(x-1)- group (x increases) but decreases with increasing the length of the -(CF2)(y)- part of the molecule (y increases) at constant x. C1 N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA. Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA. Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA. Intevac, Santa Clara, CA 95054 USA. RAB Consulting, Midland, MI 48640 USA. Lehigh Univ, Dept Chem Engn, Bethlehem, PA 18015 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. NIST, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA. RP Char, K (reprint author), N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA. NR 16 TC 102 Z9 104 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 7 PY 2000 VL 33 IS 5 BP 1882 EP 1887 DI 10.1021/ma991182o PG 6 WC Polymer Science SC Polymer Science GA 293BY UT WOS:000085832700065 ER PT J AU Xin, HP Tu, CW Zhang, Y Mascarenhas, A AF Xin, HP Tu, CW Zhang, Y Mascarenhas, A TI Effects of nitrogen on the band structure of GaNxP1-x alloys SO APPLIED PHYSICS LETTERS LA English DT Article ID GAP1-XNX ALLOYS; GAP; GAAS; LUMINESCENCE; GROWTH; SI AB We report that the incorporation of N in GaNxP1-x alloys (x greater than or equal to 0.43%) leads to a direct band-gap behavior of GaNP. For N concentration lower than 0.43%, a series of sharp emission lines from the various N pair centers are observed for GaNP bulk layers. With increasing N concentration higher than 0.43%, a strong photoluminescence (PL) emission from GaNP bulk layers is observed at room temperature. While the PL peak redshifts with increasing N concentration to 3.1%, the PL intensity remains as intense. Absorption measurements show a direct band-gap behavior of GaNP alloys. (C) 2000 American Institute of Physics. [S0003-6951(00)03510-5]. C1 Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Xin, HP (reprint author), Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. NR 20 TC 122 Z9 124 U1 1 U2 13 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 6 PY 2000 VL 76 IS 10 BP 1267 EP 1269 DI 10.1063/1.126005 PG 3 WC Physics, Applied SC Physics GA 288JZ UT WOS:000085560800017 ER PT J AU Perlin, P Wisniewski, P Skierbiszewski, C Suski, T Kaminska, E Subramanya, SG Weber, ER Mars, DE Walukiewicz, W AF Perlin, P Wisniewski, P Skierbiszewski, C Suski, T Kaminska, E Subramanya, SG Weber, ER Mars, DE Walukiewicz, W TI Interband optical absorption in free standing layer of Ga0.96In0.04As0.99N0.01 SO APPLIED PHYSICS LETTERS LA English DT Article ID ALLOYS; GAAS1-XNX AB We have measured the interband optical absorption of a free-standing sample of Ga0.96In0.04As0.99N0.01 in a wide energy range from 1 to 2.5 eV. We found that the fundamental absorption edge is shifted by 150 meV towards lower energies, and the absorption coefficient measured at higher energies exhibits substantial reduction comparing to that of GaAs. By removing the GaAs substrate, we were able to get an experimental insight into the interband optical transitions and the density of state in this material. The changes can be understood within the band anticrossing model predicting the conduction band splitting. New absorption edges associated with optical transitions from the spin-orbit split off band to the lower conduction subband (1.55 eV) and from the top of the valence band to the upper subband (1.85 eV) are observed. (C) 2000 American Institute of Physics. [S0003-6951(00)03210-1]. C1 High Pressure Res Ctr Unipress, PL-01142 Warsaw, Poland. Inst Electron Technol, PL-02668 Warsaw, Poland. Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Hewlett Packard Labs, Palo Alto, CA 94304 USA. RP Perlin, P (reprint author), High Pressure Res Ctr Unipress, Sokolowska 29-37, PL-01142 Warsaw, Poland. RI Kaminska, Eliana/C-3086-2013 NR 10 TC 61 Z9 62 U1 3 U2 11 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 6 PY 2000 VL 76 IS 10 BP 1279 EP 1281 DI 10.1063/1.126008 PG 3 WC Physics, Applied SC Physics GA 288JZ UT WOS:000085560800021 ER PT J AU Samara, GA Venturini, EL Schmidt, VH AF Samara, GA Venturini, EL Schmidt, VH TI Pressure-induced crossover from long-to-short-range order in [Pb(Zn1/3Nb2/3)O-3](0.905)(PbTiO3)(0.095) single crystal SO APPLIED PHYSICS LETTERS LA English DT Article ID SOFT MODE FERROELECTRICS; RELAXOR FERROELECTRICS; BEHAVIOR AB A pressure-induced crossover from normal ferroelectric-to-relaxor behavior has been observed in single crystal [Pb(Zn1/3Nb2/3)O-3](0.905)(PbTiO3)(0.095), or PZN-9.5% PT. Analogy with similar observations for other perovskites indicates that this crossover is a general feature of compositionally disordered soft mode ferroelectrics. The pressure-temperature phase diagram has been also determined. (C) 2000 American Institute of Physics. [S0003-6951(00)03110-7]. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Montana State Univ, Dept Phys, Bozeman, MT 59717 USA. RP Samara, GA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 13 TC 47 Z9 48 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 6 PY 2000 VL 76 IS 10 BP 1327 EP 1329 DI 10.1063/1.126024 PG 3 WC Physics, Applied SC Physics GA 288JZ UT WOS:000085560800037 ER PT J AU Fedorov, AV Brazovskii, SA Muthukumar, VN Johnson, PD Xue, J Duda, LC Smith, KE McCarroll, WH Greenblatt, M Hulbert, SL AF Fedorov, AV Brazovskii, SA Muthukumar, VN Johnson, PD Xue, J Duda, LC Smith, KE McCarroll, WH Greenblatt, M Hulbert, SL TI Direct observation of temperature-dependent Fermi surface nesting vectors in a quasi-one-dimensional conductor SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Letter ID BLUE BRONZE; MOLYBDENUM BRONZES; SPECTRAL FUNCTIONS; WAVE-VECTOR; TRANSITION; K0.30MOO3; K0.3MOO3; PHASE; MODEL AB We present the first direct observation of temperature-dependent Fermi wave vectors in the quasi-one-dimensional conductor K0.3MoO3. BY monitoring the position of these vectors through the Peierls transition using angle resolved photoemission spectroscopy, we demonstrate that the temperature dependence of the charge-density-wave vector observed in earlier experiments is actually that of the Fermi wave vectors. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. Rutgers State Univ, Dept Chem, Piscataway, NJ 08854 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. Univ Paris Sud, CNRS, F-91406 Orsay, France. RP Fedorov, AV (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RI Brazovskii, Serguei/A-9608-2012 OI Brazovskii, Serguei/0000-0001-8147-9655 NR 21 TC 27 Z9 27 U1 2 U2 12 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAR 6 PY 2000 VL 12 IS 9 BP L191 EP L198 DI 10.1088/0953-8984/12/9/101 PG 8 WC Physics, Condensed Matter SC Physics GA 295WM UT WOS:000085990900001 ER PT J AU Schultz, M Burns, CJ Schwartz, DJ Andersen, RA AF Schultz, M Burns, CJ Schwartz, DJ Andersen, RA TI Solid-state structures of base-free ytterbocenes and inclusion compounds of bis(pentamethylcyclopentadienyl)ytterbium with neutral carboranes and toluene: The role of intermolecular contacts SO ORGANOMETALLICS LA English DT Article ID X-RAY STRUCTURES; MOLECULAR-ORBITAL CALCULATIONS; ORGANOMETALLIC COMPOUNDS; PHOTOELECTRON-SPECTRA; CRYSTAL-STRUCTURE; GAS-PHASE; COMPLEXES; METAL; BENT; SAMARIUM AB The base-free ytterbocenes (Me5C5)(2)Yb, (Me4C5H)(2)Yb, and [1,3-(Me3C)(2)C5H3](2)Yb have been prepared from their diethyl ether adducts, synthesized by reaction of YbI2 and the sodium salt of the substituted cyclopentadiene anion in diethyl ether. The structures of the base-free molecules have been determined by X-ray crystallography. The molecule (Me5C5)(2)Yb has been found to crystallize in two different morphologies; the complex also forms inclusion complexes with toluene, ortho-carborane, meta-carborane, and 1,2-dimethyl-ortho-carborane. The ytterbocene molecule in all of the derivatives examined is bent in the solid state with centroid-metal-centroid angles ranging from 132 degrees to 147 degrees. A detailed examination of the structures and comparison with the reported structures of (Me5C5)(2)Eu, (Me5C5)(2)Sm, [1,3(Me3Si)(2)C5H3](2)Yb, and [1,3-(Me3Si)(2)C5H3](2)Eu reveal that bending is the general structural preference. Close inter- or intramolecular contacts are observed in every case between the ytterbium atom and one or more carbon atoms other than those of the two cyclopentadienide rings of that ytterbocene fragment. The packing geometry is dictated by the substituents on the cyclopentadienide rings, the molecules arranging so as to minimize crowding in the solid state. The net result is a coordination polymer, dimer, or monomer, depending on the ring substituents. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Andersen, RA (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Schultz, Madeleine/B-4131-2011 OI Schultz, Madeleine/0000-0001-7967-5147 NR 34 TC 47 Z9 47 U1 2 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR 6 PY 2000 VL 19 IS 5 BP 781 EP 789 DI 10.1021/om990821g PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 292TM UT WOS:000085811200011 ER PT J AU Shafiq, F Szalda, DJ Creutz, C Bullock, RM AF Shafiq, F Szalda, DJ Creutz, C Bullock, RM TI Water-soluble tungsten hydrides: Synthesis, structures, and reactions of (C5H4CO2H)(CO)(3)WH and related complexes SO ORGANOMETALLICS LA English DT Article ID CYCLOPENTADIENYL CARBONYL-COMPLEXES; ORGANOMETALLIC COMPOUNDS; CATALYTIC-HYDROGENATION; X-RAY; 1,3,5-TRIAZA-7-PHOSPHAADAMANTANE COMPLEXES; THERMODYNAMIC ACIDITY; MOLECULAR-STRUCTURE; BRIDGING LIGANDS; AQUEOUS-SOLUTION; METAL-COMPLEXES AB The water-soluble metal hydride (C5H4CO2H(CO)(3)WH (1) was prepared and characterized. The crystal structure of this complex determined by X-ray diffraction shows it to be dimeric in the solid state, due to OH ... O hydrogen bonds between the CO2H groups, The pK(a) of the W-H proton was determined to be 5.8 (+/-0.2) in water. While the CO2H site of (C5H4CO2H)(CO)(3)WH is more acidic than the W-H proton in water, the order of thermodynamic acidity is inverted in organic solvents. Deprotonation of (C5H4CO2H)(CO)(3)WH with KH in THF, followed by counterion exchange, gives [(C5H4CO2H)(CO)(3)W]-NBu4+ (2) This anion is also dimeric through intermolecular hydrogen bonding of the CO2H groups, as shown by X-ray crystallography, The reaction of PMe3 or P(OMe)(3) with (C5H4CO2H)(CO)(3)WH gives substitution of a CO ligand and formation of [C5H4CO2H)(PR3)(CO)(2)WH (R = Me, OMe), Reaction of PTA (PTA = phosphatriazaadamantane) with (C5H5)(CO)(3)WH gives (C5H5)(PTA)-(CO)(2)WH. This complex exists as an equilibrating cia/trans mixture in solution, but was crystallized as the trans isomer, as shown by X-ray crystallography, Water solubility of (C5H5)(PTA)(CO)(2)WH was negligible. The water-soluble metal-metal-bonded bimetallic complexes [(C5H4CO2H)(CO)(3)W](2), [(C5H4CO2H)(PMe3)(CO)(2)W](2), and {(C5H4CO2H)[P(OMe)(3)]-(CO)(2)W}(2) were prepared by reaction of the metal hydrides with trityl radical (Ph3C.). C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. CUNY Bernard M Baruch Coll, Dept Nat Sci, New York, NY 10010 USA. RP Bullock, RM (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 59 TC 22 Z9 22 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR 6 PY 2000 VL 19 IS 5 BP 824 EP 833 DI 10.1021/om990778x PG 10 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 292TM UT WOS:000085811200016 ER PT J AU Davoudiasl, H Hewett, JL Rizzo, TG AF Davoudiasl, H Hewett, JL Rizzo, TG TI Phenomenology of the Randall-Sundrum gauge hierarchy model SO PHYSICAL REVIEW LETTERS LA English DT Article ID P(P)OVER-BAR COLLISIONS; DIMENSIONS; SEARCH; BOSONS; MILLIMETER; TEV AB We explore the phenomenology of the localized gravity model of Randall and Sundrum where a 5-dimensional nonfactorizable geometry generates the gauge hierarchy by an exponential function called a warp factor The Kaluza-Klein (KK) tower of gravitons in this scenario has different properties from those in factorizable models. We derive the KK graviton interactions with the standard model fields and obtain constraints from their direct production at hadron colliders as well as from virtual KK exchanges. We study the KK spectrum in e(+)e(-) annihilation and show how to determine the model parameters if the first KK state is observed. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Davoudiasl, H (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 27 TC 295 Z9 295 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 MAR 6 PY 2000 VL 84 IS 10 BP 2080 EP 2083 DI 10.1103/PhysRevLett.84.2080 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100009 ER PT J AU Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Ahn, S Akimov, V Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Belyaev, A Beri, SB Bernardi, G Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Chen, W Cho, DK Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Fatyga, MK Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gobbi, B Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, JA Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NH Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Ito, AS Jerger, SA Jesik, R Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Landry, F Landsberg, G Leflat, A Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lu, JG Lucotte, A Lueking, L Maciel, AKA Madaras, RJ Manankov, V Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miao, C Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, R Oshima, N Owen, D Padley, P Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Reay, NW Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Song, XF Sosebee, M Sotnikova, N Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Toback, D Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Y Zanabria, M Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Ahn, S Akimov, V Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Belyaev, A Beri, SB Bernardi, G Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Chen, W Cho, DK Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Ducros, Y Dudko, LV Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Fatyga, MK Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gobbi, B Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, DR Green, JA Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NH Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Ito, AS Jerger, SA Jesik, R Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Landry, F Landsberg, G Leflat, A Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lu, JG Lucotte, A Lueking, L Maciel, AKA Madaras, RJ Manankov, V Mani, S Mao, HS Markeloff, R Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merkin, M Merritt, KW Miao, C Miettinen, H Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, R Oshima, N Owen, D Padley, P Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Pope, BG Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Reay, NW Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Song, XF Sosebee, M Sotnikova, N Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Toback, D Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Y Zanabria, M Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A CA D0 Collaboration TI Search for second-generation leptoquark pairs in (p)over-barp collisions at root s=1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID P(P)OVER-BAR COLLISIONS AB We have searched for second-generation leptoquark (LQ) pairs in the mu mu + jets channel using 94 +/- 5 pb(-1) of (p) over bar p collider data collected by the DO experiment at the Fermilab Tevatron during 1993-1996. No evidence for a signal is observed. These results are combined with those from the mu v + jets and vv + jets channels to obtain 95% confidence level (C.L.) upper limits on the LQ pair production cross section as a function of mass and beta, the branching fraction of a LQ decay into a charged lepton and a quark. Lower limits of 200(180) GeV/c(2) for beta = 1(1/2) are set at the 95% C.L. on the mass of scalar LQ. Mass limits are also set on vector leptoquarks as a function of beta. C1 NYU, New York, NY 10003 USA. Univ Buenos Aires, Buenos Aires, DF, Argentina. LAFEX, Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil. Univ Estado Rio De Janeiro, Rio De Janeiro, Brazil. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Los Andes, Bogota, Colombia. Univ San Francisco Quito, Quito, Ecuador. Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, Grenoble, France. CNRS, IN2P3, Ctr Phys Particules Marseillo, Marseille, France. Univ Paris 06, LPNHE, Paris, France. Univ Paris 07, CNRS, IN2P3, Paris, France. CEA, Serv Phys Particules, DAPNIA, Saclay, France. Panjab Univ, Chandigarh 160014, India. Univ Delhi, Delhi 110007, India. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. Seoul Natl Univ, Seoul, South Korea. CINVESTAV, Mexico City 14000, DF, Mexico. Inst Nucl Phys, Krakow, Poland. Inst Theoret & Expt Phys, Moscow 117259, Russia. Moscow State Univ, Moscow, Russia. Inst High Energy Phys, Protvino, Russia. Univ Lancaster, Lancaster, England. Univ Arizona, Tucson, AZ 85721 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Calif Davis, Davis, CA 95616 USA. Calif State Univ Fresno, Fresno, CA 93740 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Illinois, Chicago, IL 60607 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Indiana Univ, Bloomington, IN 47405 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Purdue Univ, W Lafayette, IN 47907 USA. Iowa State Univ, Ames, IA 50011 USA. Univ Kansas, Lawrence, KS 66045 USA. Kansas State Univ, Manhattan, KS 66506 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Boston Univ, Boston, MA 02215 USA. Northeastern Univ, Boston, MA 02115 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ Nebraska, Lincoln, NE 68588 USA. Columbia Univ, New York, NY 10027 USA. Univ Rochester, Rochester, NY 14627 USA. SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Langston Univ, Langston, OK 73050 USA. Univ Oklahoma, Norman, OK 73019 USA. Brown Univ, Providence, RI 02912 USA. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. Rice Univ, Houston, TX 77005 USA. Univ Washington, Seattle, WA 98195 USA. RP Abbott, B (reprint author), NYU, 550 1St Ave, New York, NY 10003 USA. RI Sznajder, Andre/L-1621-2016; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Leflat, Alexander/D-7284-2012; Dudko, Lev/D-7127-2012; Merkin, Mikhail/D-6809-2012; Yip, Kin/D-6860-2013; Kuleshov, Sergey/D-9940-2013; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Belyaev, Alexander/F-6637-2015 OI Sznajder, Andre/0000-0001-6998-1108; Kim, Sun Kee/0000-0002-0013-0775; Dudko, Lev/0000-0002-4462-3192; Yip, Kin/0000-0002-8576-4311; Kuleshov, Sergey/0000-0002-3065-326X; De, Kaushik/0000-0002-5647-4489; Belyaev, Alexander/0000-0002-1733-4408 NR 27 TC 32 Z9 32 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 MAR 6 PY 2000 VL 84 IS 10 BP 2088 EP 2093 DI 10.1103/PhysRevLett.84.2088 PG 6 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100011 ER PT J AU Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, F Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Bloom, K Blumenfeld, B Busk, BS Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van der Brink, S Bromberg, C Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Cihangir, S Ciobanu, CI Clark, AG Cobal, M Cocca, E Connolly, A Conway, J Cooper, J Cordelli, M Costanzo, D Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Geer, S Gerdes, DW Giannetti, P Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Green, C Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Hao, W Happacher, F Hara, K Hardman, AD Harris, RM Harmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Hinrichsen, B Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kamabara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kirk, M Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Meschi, E Mesropian, C Miao, C Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Moggi, N Moore, E Moore, R Morita, Y Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Musy, M Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okusawa, T Olsen, J Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Parri, A Partos, D Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Phillips, TJ Piacentino, G Pitts, KT Plunkett, R Pompos, A Pondrom, L Pope, G Prokoshin, E Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reichold, A Riegler, W Ribon, A Rimondi, F Ristori, L Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Singh, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Takano, T Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Ukegawa, F Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Vologouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Zanetti, A Zetti, F Zucchelli, S AF Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, F Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Bigongiari, C Binkley, M Bisello, D Blair, RE Blocker, C Bloom, K Blumenfeld, B Busk, BS Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van der Brink, S Bromberg, C Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Caner, A Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Cihangir, S Ciobanu, CI Clark, AG Cobal, M Cocca, E Connolly, A Conway, J Cooper, J Cordelli, M Costanzo, D Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Gadomski, S Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Geer, S Gerdes, DW Giannetti, P Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Green, C Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Hao, W Happacher, F Hara, K Hardman, AD Harris, RM Harmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Hinrichsen, B Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kamabara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kirk, M Kim, BJ Kim, HS Kim, SH Kim, YK Kirsch, L Klimenko, S Knoblauch, D Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Meschi, E Mesropian, C Miao, C Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Moggi, N Moore, E Moore, R Morita, Y Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Musy, M Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okusawa, T Olsen, J Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Parri, A Partos, D Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Phillips, TJ Piacentino, G Pitts, KT Plunkett, R Pompos, A Pondrom, L Pope, G Prokoshin, E Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Reichold, A Riegler, W Ribon, A Rimondi, F Ristori, L Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Singh, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takashima, R Takikawa, K Tanaka, M Takano, T Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Ukegawa, F Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Vologouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Zanetti, A Zetti, F Zucchelli, S CA CDF Collaboration TI Production of Upsilon(1S) Mesons from chi(b) decays in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARKONIUM; J/PSI; CDF AB We have reconstructed the radiative decays chi(b)(1P) --> Y(1S)gamma and chi(b)(2P) --> Y(1S)gamma in (p) over bar p collisions at root s = 1.8 TeV, and measured the fraction of Y(1S) mesons that originate-from these decays. For Y(1S) mesons with p(T)(Y) > 8.0 GeV/c, the fractions that come from chi(b)(1P) and chi(b)(2P) decays are [27.1 +/- 619(stat) +/- 4.4(syst)]% and [10.5 +/- 4.4(stat) +/- 1.4(syst)]%, respectively. We have derived the fraction of directly produced Y(1S) mesons to be [50.9 +/- 8.2(stat) +/- 9.0(syst)]%. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 Los Angeles, Los Angeles, CA 90024 USA. Univ Cantabria, Inst Fis, E-39005 Santander, Spain. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Nucl Res Inst, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 32611 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Kyungpook Natl Univ, Korean Hadron Collider Lab, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 305, Japan. 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. Univ New Mexico, Albuquerque, NM 87131 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. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 78409 USA. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Tufts Univ, Medford, MA 02115 USA. Waseda Univ, Tokyo 169, Japan. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Affolder, T (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Introzzi, Gianluca/K-2497-2015; vilar, rocio/D-7454-2014; Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Scodellaro, Luca/K-9091-2014; Paulini, Manfred/N-7794-2014 OI Introzzi, Gianluca/0000-0002-1314-2580; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Scodellaro, Luca/0000-0002-4974-8330; Paulini, Manfred/0000-0002-6714-5787 NR 10 TC 82 Z9 83 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 MAR 6 PY 2000 VL 84 IS 10 BP 2094 EP 2099 DI 10.1103/PhysRevLett.84.2094 PG 6 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100012 ER PT J AU Ressler, JJ Piechaczek, A Walters, WB Aprahamian, A Wiescher, M Batchelder, JC Bingham, CR Brenner, DS Ginter, TN Gross, CJ Grzywacz, R Kulp, D MacDonald, B Reviol, W Rikovska, J Rykaczewski, K Winger, JA Zganjar, EF AF Ressler, JJ Piechaczek, A Walters, WB Aprahamian, A Wiescher, M Batchelder, JC Bingham, CR Brenner, DS Ginter, TN Gross, CJ Grzywacz, R Kulp, D MacDonald, B Reviol, W Rikovska, J Rykaczewski, K Winger, JA Zganjar, EF TI Half-life measurement for the rp-process waiting point nuclide Zr-80 SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON-STAR; T-Z=1 NUCLEI; MASS; Y-80 AB X-ray bursts have been suggested as a possible site for the astrophysical rp-process. The time scale for the process is governed by beta-decay half-lives of several even-even N = Z waiting point nuclei, in particular, N = Z = 40 Zr-80. A 4.1((+0.8)(-0.6))-s beta(+)/EC half-life for Zr-80 was determined by observing delayed 84-keV gamma rays depopulating a T-1/2 = 4-mu s isomer at 312 keV in the laughter Y-80. As this half-life is lower than many previously predicted values, the calculated excessive production of A = 80 nuclides in astrophysical x-ray burst scenarios is reduced, and less extreme conditions are necessary for the production of heavier nuclides. C1 Univ Maryland, Dept Chem, College Pk, MD 20742 USA. Louisiana State Univ, Dept Phys, Baton Rouge, LA 70803 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Clark Univ, Dept Chem, Worcester, MA 01610 USA. Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA. Univ Warsaw, PL-00681 Warsaw, Poland. Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA. RP Univ Maryland, Dept Chem, College Pk, MD 20742 USA. RI Ressler, Jennifer Jo/F-2279-2010 NR 29 TC 25 Z9 25 U1 1 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 MAR 6 PY 2000 VL 84 IS 10 BP 2104 EP 2107 DI 10.1103/PhysRevLett.84.2104 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100014 ER PT J AU Kolesnichenko, YI Lutsenko, VV White, RB Yakovenko, YV AF Kolesnichenko, YI Lutsenko, VV White, RB Yakovenko, YV TI Small-action particles in a tokamak in the presence of an n=1 mode SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLASMA AB It is found that an m = n = 1 mode with amplitude exceeding a certain threshold can lead to stochastic motion of energetic ions in tokamaks, the large orbit width particles (potatoes) being most easily affected. An n = 1 mode can redistribute particles also in the absence of stochasticity but only when the perturbation is quickly switched on/off; e.g., during a sawtooth crash. In the latter case, the perturbation results in a regular motion of particles around a certain helical orbit, at which a resonance driven by the mode but having no amplitude threshold takes place. C1 Nucl Res Inst, Ctr Sci, UA-252680 Kiev, Ukraine. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Kolesnichenko, YI (reprint author), Nucl Res Inst, Ctr Sci, UA-252680 Kiev, Ukraine. RI White, Roscoe/D-1773-2013; OI White, Roscoe/0000-0002-4239-2685; Yakovenko, Yuriy/0000-0002-3499-5275 NR 10 TC 5 Z9 5 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 6 PY 2000 VL 84 IS 10 BP 2152 EP 2155 DI 10.1103/PhysRevLett.84.2152 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100026 ER PT J AU Justo, JF de Koning, M Cai, W Bulatov, VV AF Justo, JF de Koning, M Cai, W Bulatov, VV TI Vacancy interaction with dislocations in silicon: The shuffle-glide competition SO PHYSICAL REVIEW LETTERS LA English DT Article ID 90-DEGREES PARTIAL DISLOCATION; FREE-ENERGY; ELECTRON-MICROSCOPY; KINKS; PSEUDOPOTENTIALS; SEMICONDUCTORS; MOTION; CORES; SI AB Competition between the two alternative positions (shuffle and glide {111} plane subsets) for the core of a 30 degrees partial dislocation in Si is examined. Using a combination of nb initio total energy calculations with finite temperature free-energy calculations based on an interatomic potential, we obtained free energies for the relevant vacancy-type core defects. Generally, the free energy of vacancy formation in the core of a 30 degrees glide partial dislocation is considerably lower (by more than 1 eV) than in the bulk. However, even at high temperatures, the predicted thermal concentration of the shuffle segments comprised of a row of vacancies in the core is low, placing the 30 degrees partial dislocation in the glide subset position. C1 Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil. MIT, Dept Nucl Engn, Cambridge, MA 02139 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Justo, JF (reprint author), Univ Sao Paulo, Inst Fis, CP 66318, BR-05315970 Sao Paulo, Brazil. RI de Koning, Maurice/E-1115-2012; OI de Koning, Maurice/0000-0002-0035-4170; Cai, Wei/0000-0001-5919-8734 NR 35 TC 50 Z9 51 U1 1 U2 14 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 MAR 6 PY 2000 VL 84 IS 10 BP 2172 EP 2175 DI 10.1103/PhysRevLett.84.2172 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100031 ER PT J AU Goremychkin, EA Osborn, R Rainford, BD Murani, AP AF Goremychkin, EA Osborn, R Rainford, BD Murani, AP TI Evidence for anisotropic Kondo behavior in Ce0.8La0.2Al3 SO PHYSICAL REVIEW LETTERS LA English DT Article ID DISSIPATIVE 2-STATE SYSTEM; TEMPERATURE SPECIFIC-HEAT; COMPOUND CEAL3; DYNAMICS; EXCITATIONS; DEPENDENCE; URU2SI2; MODEL AB We have performed an inelastic neutron scattering study of the low energy spin dynamics of the heavy fermion compound Ce0.8La0.2Al3 as a function of temperature and external pressure up to 5 kbar. At temperatures below 3 K, the magnetic response transforms from a quasielastic form, common to many heavy fermion systems, to a single well-defined inelastic peak, which is extremely sensitive to external pressure. The scaling of the spin dynamics and the thermodynamic properties are in agreement with the predictions of the anisotropic Kondo model. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Univ Southampton, Dept Phys, Southampton SO17 1BJ, Hants, England. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. RP Goremychkin, EA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 17 TC 16 Z9 16 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 6 PY 2000 VL 84 IS 10 BP 2211 EP 2214 DI 10.1103/PhysRevLett.84.2211 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100041 ER PT J AU Neukirch, U Bolton, SR Fromer, NA Sham, LJ Chemla, DS AF Neukirch, U Bolton, SR Fromer, NA Sham, LJ Chemla, DS TI Polariton-biexciton transitions in a semiconductor microcavity SO PHYSICAL REVIEW LETTERS LA English DT Article ID FEMTOSECOND; CAVITY; REGIME AB The influence of four-particle correlations on the nonlinear optics of a semiconductor microcavity is determined by a pump-and-probe investigation. Experiments are performed on a nonmonolithic microcavity which contains a ZnSe quantum well. In this system the biexciton binding energy exceeds both the normal-mode splitting between exciton and cavity mode and all damping constants. Oscillatory spectral features below the excitonic resonance are observed in the response for counterpolarized beams. Comparison with model calculations shows that in this case the coherent nonlinearity is dominated by biexciton-exciton interactions beyond the Hartree-Fock approximation. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Univ Bremen, Inst Festkorperphys, POB 330 440, D-28334 Bremen, Germany. OI Sham, Lu/0000-0001-5718-2077 NR 18 TC 35 Z9 35 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 6 PY 2000 VL 84 IS 10 BP 2215 EP 2218 DI 10.1103/PhysRevLett.84.2215 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100042 PM 11017247 ER PT J AU Vlasko-Vlasov, VK Lin, YK Miller, DJ Welp, U Crabtree, GW Nikitenko, VI AF Vlasko-Vlasov, VK Lin, YK Miller, DJ Welp, U Crabtree, GW Nikitenko, VI TI Direct magneto-optical observation of a structural phase transition in thin films of manganites SO PHYSICAL REVIEW LETTERS LA English DT Article ID CA-MN-O; COLOSSAL MAGNETORESISTANCE; PEROVSKITES; LA1-XCAXMNO3 AB The spontaneous formation of twins in La2/3Ca1/3MnO3 films below T-S similar to 105 K is observed by a magneto-optical technique. The twins are revealed as stripes along the {110} directions where magnetization tilts out of the film plane due to the stresses in twins. Their appearance is associated with a martensitic phase transition in the film triggered by the cubic-to-tetragonal transition in the SrTiO3 substrate. It is found that magnetization of the films proceeds by inhomogeneous rotation of magnetic moments. This is due to the presence of microscopic structural inhomogeneities. Their dominating role in the low-temperature transport can explain small effects of the transition at T-S on the resistivity. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 24 TC 64 Z9 64 U1 0 U2 11 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 MAR 6 PY 2000 VL 84 IS 10 BP 2239 EP 2242 DI 10.1103/PhysRevLett.84.2239 PG 4 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100048 PM 11017253 ER PT J AU Klein, L Dodge, JS Geballe, TH Beasley, MR Kapitulnik, A AF Klein, L Dodge, JS Geballe, TH Beasley, MR Kapitulnik, A TI Resistive anomalies at ferromagnetic transitions revisited: The case of SrRuO3 - Klein et al. reply SO PHYSICAL REVIEW LETTERS LA English DT Article ID BEHAVIOR C1 Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel. EO Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA. RP Klein, L (reprint author), Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel. RI Klein, Lior/B-1061-2008 OI Klein, Lior/0000-0002-1233-9453 NR 11 TC 6 Z9 6 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 MAR 6 PY 2000 VL 84 IS 10 BP 2280 EP 2280 DI 10.1103/PhysRevLett.84.2280 PG 1 WC Physics, Multidisciplinary SC Physics GA 289YT UT WOS:000085650100059 ER PT J AU Mitchell, SA Vavasis, SA AF Mitchell, SA Vavasis, SA TI Quality mesh generation in higher dimensions SO SIAM JOURNAL ON COMPUTING LA English DT Article DE triangulation; aspect ratio; tetrahedra; mesh generation; polyhedron AB We consider the problem of triangulating a d-dimensional region. Our mesh generation algorithm, called QMG, is a quadtree-based algorithm that can triangulate any polyhedral region including nonconvex regions with holes. Furthermore, our algorithm guarantees a bounded aspect ratio triangulation provided that the input domain itself has no sharp angles. Finally, our algorithm is guaranteed never to overrefine the domain, in the sense that the number of simplices produced by QMG is bounded above by a factor times the number produced by any competing algorithm, where the factor depends on the aspect ratio bound satisfied by the competing algorithm. The QMG algorithm has been implemented in C++ and is used as a mesh generator for the finite element method. C1 Sandia Natl Labs, Dept Computat Mech & Visualizat, Albuquerque, NM 87185 USA. Cornell Univ, Dept Comp Sci, Ithaca, NY 14853 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Mitchell, SA (reprint author), Sandia Natl Labs, Dept Computat Mech & Visualizat, POB 5800, Albuquerque, NM 87185 USA. NR 17 TC 39 Z9 40 U1 0 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0097-5397 J9 SIAM J COMPUT JI SIAM J. Comput. PD MAR 6 PY 2000 VL 29 IS 4 BP 1334 EP 1370 DI 10.1137/S0097539796314124 PG 37 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA 293WM UT WOS:000085878000015 ER PT J AU Wang, CA Zhu, BH AF Wang, CA Zhu, BH TI Three-dimensional weak visibility: Complexity and applications SO THEORETICAL COMPUTER SCIENCE LA English DT Article DE visibility; polyhedral terrain; computational geometry ID POLYHEDRAL TERRAINS; SHORTEST WATCHTOWER; ASPECT GRAPH; ALGORITHM; POLYGON; OBJECTS; TIME AB In this paper, we study the complexity of 3D weak visibility. We obtain an O(n(8)) time and Theta(n(6)) space algorithm to compute the weakly visible region of a triangle F from another triangle G among general scenes, which are a set of n disjoint triangles. We also consider the cases when the scenes are rectilinear objects and polyhedral terrains. We show that in these special situations the weakly visible regions can be computed much faster in O(n(6)) time and O(n(4)) space. With these results, we obtain the first known polynomial time algorithm to decide whether or not a simple polyhedron is weakly (internally or externally) visible. (C) 2000 Elsevier Science B.V. All rights reserved. C1 City Univ Hong Kong, Dept Comp Sci, Hong Kong, Hong Kong, Peoples R China. Mem Univ Newfoundland, Dept Comp Sci, St John, NF A1B 3X8, Canada. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Zhu, BH (reprint author), City Univ Hong Kong, Dept Comp Sci, Hong Kong, Hong Kong, Peoples R China. EM bhz@cs.cityu.edu.hk RI Zhu, Binhai/A-2911-2008 NR 29 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3975 EI 1879-2294 J9 THEOR COMPUT SCI JI Theor. Comput. Sci. PD MAR 6 PY 2000 VL 234 IS 1-2 BP 219 EP 232 DI 10.1016/S0304-3975(98)00132-7 PG 14 WC Computer Science, Theory & Methods SC Computer Science GA 293ET UT WOS:000085839100009 ER PT J AU Aida, M Yamataka, H Dupuis, M AF Aida, M Yamataka, H Dupuis, M TI Critical assessment of the hybrid QM/MM-pol-vib approach: Small water clusters using polarizable flexible water potentials SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; LIQUID WATER; AB-INITIO; COMBINED QUANTUM; FREE-ENERGY; PHASE; SOLVATION; DIMERS; FIELD AB We report a systematic study of the structure of small water clusters, up to pentamers, using a hybrid quantum-mechanics/molecular-mechanics approach with polarizable flexible water-interaction potentials in conjunction with HF SCF wave functions. The model is denoted QM/MM-pol-vib. For each optimized QM cluster, we replaced QM? water molecules one at a time with MM-pol-vib water molecules and reoptimized the cluster structure. We found that the hybrid structures and energies reproduce well their full QM counterparts. This finding indicates that the first hydration shell, of solvation obtained with such a model is described at a semiquantitative level of accuracy. The model should prove useful in modeling aqueous reactions. We outline the efficient computational strategy adopted for coupling the polarizable response of the solvent with the solute wa iie function calculation. Energy gradients for the solute and the solvent molecules are also efficiently calculated. (C) 2000 John Wiley & Sons, Inc. C1 Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan. Hiroshima Univ, Dept Chem, Higashihiroshima 7398526, Japan. RP Dupuis, M (reprint author), Pacific NW Lab, Environm Mol Sci Lab, POB 999, Richland, WA 99352 USA. RI Aida, Misako/D-1670-2010 OI Aida, Misako/0000-0001-8788-1071 NR 32 TC 15 Z9 15 U1 1 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD MAR 5 PY 2000 VL 77 IS 1 BP 199 EP 210 DI 10.1002/(SICI)1097-461X(2000)77:1<199::AID-QUA19>3.3.CO;2-K PG 12 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA 281EL UT WOS:000085144900017 ER PT J AU Newton, MD AF Newton, MD TI Modeling donor/acceptor interactions: Combined roles of theory and computation SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article DE superexchange; transfer integral; donor/acceptor coupling; electron transfer; hole transfer ID ALPHA,OMEGA-DIPYRIDYL TRANS-POLYENES; ELECTRON-TRANSFER; BIS(PENTAAMMINERUTHENIUM) COMPLEXES; MATRIX-ELEMENTS; BRIDGED SYSTEMS; ENERGY-TRANSFER; MULLIKEN-HUSH; THROUGH-BOND; FERROCENE; SPECTRA AB An extended superexchange model for electron transfer (ET) matrix elements (H(DA)) has been formulated as a superposition of McConnell-type pathways and implementated by combined use of configuration interaction wave functions (obtained using the INDO/s model of Zerner and co-workers) and the generalized Mulliken-Hush formulation of charge-localized diabatic states. Applications are made for et (and hole transfer) in several donor/bridge/acceptor radical anion (and cation) systems, (DBA)(+/-), allowing detailed comparison with experimental HDA estimates. For the case of oligo phenylene ethynylene (OPE) bridges, the role of pi and sigma electronic manifolds for different distributions of phenylene torsion angles is analyzed in detail. (C) 2000 John Wiley & Sons, Inc. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RP Newton, MD (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 38 TC 68 Z9 69 U1 1 U2 10 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD MAR 5 PY 2000 VL 77 IS 1 BP 255 EP 263 DI 10.1002/(SICI)1097-461X(2000)77:1<255::AID-QUA23>3.0.CO;2-O PG 9 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA 281EL UT WOS:000085144900021 ER PT J AU Nunomura, W Takakuwa, Y Parra, M Conboy, JG Mohandas, N AF Nunomura, W Takakuwa, Y Parra, M Conboy, JG Mohandas, N TI Ca2+-dependent and Ca2+-independent calmodulin binding sites in erythrocyte protein 4.1 - Implications for regulation of protein 4.1 interactions with transmembrane proteins SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID SPECTRIN-ACTIN BINDING; MEMBRANE CA2+ PUMP; PLASMA-MEMBRANE; SKELETAL PROTEIN-4.1; OPTICAL BIOSENSOR; RESONANT MIRROR; DOMAIN; PURIFICATION; MODULATION; ADDUCIN AB In vitro protein binding assays identified two distinct calmodulin (CaM) binding sites within the NH2-terminal 30-kDa domain of erythrocyte protein 4.1 (4.1R): a Ca2+- independent binding site (A(264)KKLWKVCVEHHTFFRL) and a Ca2+-dependent binding site (A(181)KKLSMYGVDLHKAKDL). Synthetic peptides corresponding to these sequences bound CaM in vitro; conversely, deletion of these peptides from a 30-kDa construct reduced binding to CaM. Thus, 4.1R is a unique CaM-binding protein in that it has distinct Ca2+-dependent and Ca2+-independent high affinity CaM binding sites. CaM bound to 4.1R at a stoichiometry of 1:1 both in the presence and absence of Ca2+, implying that one CaM molecule binds to two distinct sites in the same molecule of 4.1R Interactions of 4.1R with membrane proteins such as band 3 is regulated by Ca2+ and CaM. While the intrinsic affinity of the 30-kDa domain for the cytoplasmic tail of erythrocyte membrane band 3 was not altered by elimination of one or both CaM binding sites, the ability of Cd2+/CaM to down-regulate 4.1R-band 3 interaction was abrogated by such deletions. Thus, regulation of protein 4.1 binding to membrane proteins by Ca2+ and CaM requires binding of CaM to both Ca2+-independent and Ca2+-dependent sites in protein 4.1. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. Tokyo Womens Med Univ, Sch Med, Dept Biochem, Tokyo 1628666, Japan. RP Mohandas, N (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Mail Stop 74-157,1 Cyclotron Rd, Berkeley, CA 94720 USA. FU NIDDK NIH HHS [DK 26263, DK 32094] NR 43 TC 54 Z9 59 U1 0 U2 3 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 3 PY 2000 VL 275 IS 9 BP 6360 EP 6367 DI 10.1074/jbc.275.9.6360 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 290AP UT WOS:000085654400048 PM 10692436 ER PT J AU Miyabe, K Khattabi, S Cherrak, DE Guiochon, G AF Miyabe, K Khattabi, S Cherrak, DE Guiochon, G TI Study on the accuracy of the elution by characteristic point method for the determination of single component isotherms SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE adsorption isotherms; characteristic point method; mathematical modelling ID ADSORPTION AB The accuracy of the method of elution by characteristic point (ECP) used to determine single component isotherms was studied numerically. Overloaded elution peaks were calculated using the equilibrium-dispersive model of nonlinear chromatography while varying the four parameters, i.e., the number of theoretical plates, the dimensionless Langmuir equilibrium constant, the retention and the loading factor, involved in the fundamental equations of the problem. Single component isotherms were estimated by analyzing the diffuse profile of the elution peaks by the ECP method. Similar results were obtained with the transport-dispersive model. The comparison of these calculated isotherms with the initial Langmuir isotherms provided detailed information on the influence of the mass transfer resistances on the accuracy of the isotherms afforded by the ECP method. The systematic error made on the isotherms depends on the experimental conditions, described by the four parameters. It is expected that this error could be eliminated by correcting the influence of nonequilibrium in the column on the basis of results of the nondimensional calculations. The concentration range of the objective isotherm which can be determined by the ECP method can also be predicted by numerical calculations. The usefulness of the correction strategy and the prediction of the concentration range were experimentally demonstrated. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Food Sci & Technol, Knoxville, TN 37901 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 12 TC 22 Z9 22 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD MAR 3 PY 2000 VL 872 IS 1-2 BP 1 EP 21 DI 10.1016/S0021-9673(99)01266-2 PG 21 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 292RA UT WOS:000085807800001 PM 10749483 ER PT J AU Schlichting, I Berendzen, J Chu, K Stock, AM Maves, SA Benson, DE Sweet, BM Ringe, D Petsko, GA Sligar, SG AF Schlichting, I Berendzen, J Chu, K Stock, AM Maves, SA Benson, DE Sweet, BM Ringe, D Petsko, GA Sligar, SG TI The catalytic pathway of cytochrome P450cam at atomic resolution SO SCIENCE LA English DT Article ID PEROXIDASE COMPOUND-I; PSEUDOMONAS-PUTIDA CYTOCHROME-P-450; CRYSTAL-STRUCTURE; OXYGEN ACTIVATION; C PEROXIDASE; CRYSTALLOGRAPHY; HYDROXYLATION; P-450CAM; INTERMEDIATE; SPECTROSCOPY AB Members of the cytochrome P450 superfamily catalyze the addition of molecular oxygen to nonactivated hydrocarbons at physiological temperature-a reaction that requires high temperature to proceed in the absence of a catalyst. Structures were obtained for three intermediates in the hydroxylation reaction of camphor by P450cam with trapping techniques and cryocrystallography. The structure of the ferrous dioxygen adduct of P450cam was determined with 0.91 angstrom wavelength x-rays; irradiation with 1.5 angstrom x-rays results in breakdown of the dioxygen molecule to an intermediate that would be consistent with an oxyferryl species. The structures show conformational changes in several important residues and reveal a network of bound water molecules that may provide the protons needed for the reaction. C1 Max Planck Inst Mol Physiol, Dept Phys Biochem, D-44227 Dortmund, Germany. Univ Calif Los Alamos Natl Lab, Biophys Grp, Los Alamos, NM 87545 USA. Rutgers State Univ, Ctr Adv Biotechnol & Med, Piscataway, NJ 08854 USA. Univ Illinois, Beckman Inst, Urbana, IL 61801 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. Brandeis Univ, Rosenstiel Basic Med Sci Res Ctr, Waltham, MA 02254 USA. RP Schlichting, I (reprint author), Max Planck Inst Mol Physiol, Dept Phys Biochem, Otto Hahn Str 11, D-44227 Dortmund, Germany. RI Schlichting, Ilme/I-1339-2013 FU NIGMS NIH HHS [GM31756, GM33775] NR 66 TC 927 Z9 932 U1 13 U2 125 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD MAR 3 PY 2000 VL 287 IS 5458 BP 1615 EP 1622 DI 10.1126/science.287.5458.1615 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 289NE UT WOS:000085628200028 PM 10698731 ER PT J AU Bartels, DM Cook, AR Mudaliar, M Jonah, CD AF Bartels, DM Cook, AR Mudaliar, M Jonah, CD TI Spur decay of the solvated electron in picosecond radiolysis measured with time-correlated absorption spectroscopy SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID HYDRATED ELECTRON; 3 NS; YIELDS; RADICALS; PS AB Spur decay kinetics of the hydrated electron following picosecond pulse radiolysis of water have been measured using a time-correlated transient absorption technique with an asynchronous mode-locked laser. The 11 us time window afforded by this signal-averaging technique is ideal to match up with more: conventional transient absorption measurements taken to microsecond time scales. The precise data recorded in this study require a revision downward of the "time zero" solvated electron yield to approximately 4.0 per 100 eV of energy absorbed, to match the best available scavenger product measurements. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Bartels, DM (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. OI Cook, Andrew/0000-0001-6633-3447 NR 22 TC 76 Z9 76 U1 3 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD MAR 2 PY 2000 VL 104 IS 8 BP 1686 EP 1691 DI 10.1021/jp992723e PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 289VF UT WOS:000085642100010 ER PT J AU Thiel, PA Evans, JW AF Thiel, PA Evans, JW TI Nucleation, growth, and relaxation of thin Films: Metal(100) homoepitaxial systems SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; SUBMONOLAYER ISLAND FORMATION; ENERGY-ELECTRON-DIFFRACTION; MONTE-CARLO SIMULATIONS; MOLECULAR-BEAM EPITAXY; SURFACE SELF-DIFFUSION; X-RAY-SCATTERING; LOW-TEMPERATURE; AG/AG(100) HOMOEPITAXY; CLUSTER DIFFUSION AB We describe work in our laboratory that has shed new light on nucleation, growth, and relaxation processes in thin metal films. The progress comes from the synergistic and synchronous implementation of theory and experiment, which reveals surprising secrets hidden a very simple model system. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Math, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Thiel, PA (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. NR 89 TC 33 Z9 33 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 2 PY 2000 VL 104 IS 8 BP 1663 EP 1676 DI 10.1021/jp9933471 PG 14 WC Chemistry, Physical SC Chemistry GA 289VE UT WOS:000085642000001 ER PT J AU Gole, JL Dixon, DA AF Gole, JL Dixon, DA TI Isomerization of fluorophors on a treated silicon surface SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID HIGHLY POROUS SILICON; ELECTROCHEMICAL METHOXYLATION; VISIBLE-PHOTOLUMINESCENCE; OPTICAL-PROPERTIES; DEFECT CENTER; LUMINESCENCE; RED; ABSTRACTION; PREDICTION; EXCITATION AB In contrast to the green and familiar orange-red emissions associated with UV excited porous silicon (PS), the origins of the longer wavelength photoluminescence (PL) excited in the visible and near-infrared regions on a PS surface at 298 degrees K are considered within an alternate molecular model. Ab initio molecular orbital theory is used to suggest that the longest wavelength PL observed as a result of the nitrogen laser pumping of post-etch dye and HCl treated PS samples and that accessed with near-infrared excitation sources (PLE) at 298 K arises in large part from singlet-triplet transitions in silylene-based moieties (:SIRY) attached to the PS surface or present as uncoupled defect sites at or near the surface. This long-wavelength PL is distinct from the ultraviolet light excited PL associated with IFS which has previously been attributed to a silanone-based silicon oxyhydride moiety attached to the surface. Ab initio molecular theory at the MP2 level with polarized double-basis sets (MP2/DZP) has been used to calculate the singlet-triplet separation for a number of silylenes with a variety of combinations of R, Y = H, OH, SiH(3), OSiH(3), Cl, and NH(2) and to evaluate their thermodynamic stability relative to the silanones. The calculations show that the singlet silylene is always more stable than its triplet with transition wavelengths ranging from 1100 to 420 nm, where the highest transition energies are found to correlate with the most electronegative substituents. The silylene isomers are found to be more stable than the corresponding silanones in most cases. The relative stabilities are strongly coupled to the electronegativity of the substituents and to the formation of an Si-O bond in the silylene as compared to the much weaker Si-Si bond in the silanone. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA. RP Dixon, DA (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, POB 999,Kl-83, Richland, WA 99352 USA. NR 51 TC 2 Z9 2 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 2 PY 2000 VL 104 IS 8 BP 1777 EP 1782 DI 10.1021/jp9933469 PG 6 WC Chemistry, Physical SC Chemistry GA 289VE UT WOS:000085642000014 ER PT J AU Scholes, GD Fleming, GR AF Scholes, GD Fleming, GR TI On the mechanism of light harvesting in photosynthetic purple bacteria: B800 to B850 energy transfer SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Review ID LH2 ANTENNA COMPLEX; RHODOPSEUDOMONAS-ACIDOPHILA STRAIN-10050; EXCITON RESONANCE INTERACTIONS; RIGIDLY LINKED NAPHTHALENE; PIGMENT-PROTEIN COMPLEXES; PUMP-PROBE SPECTROSCOPY; STIMULATED PHOTON-ECHO; RHODOBACTER-SPHAEROIDES; EXCITATION TRANSFER; ELECTRON-TRANSFER AB The rate of energy transfer from B800 to B850 in the peripheral light harvesting complex LH2 is modeled in detail. A method for determining ensemble average energy transfer rates in complex, coupled multichromophoric systems is reported and is employed to investigate the interplay of electron-phonon coupling (fast fluctuations of the protein) and site energy disorder (slow fluctuations) on the spectral overlap between donor and acceptor, and therefore the energy transfer rate. A series of model calculations for Rb. sphaeroides is reported. The disorder is found to have a marked influence on the calculated rate of energy transfer and is responsible for a faster energy transfer time than would occur in its absence and furthermore accounts for the weak temperature dependence observed in experiment. The excitonic nature of the acceptor (albeit dynamically localized) also has impact in terms of how B850 functions as an energy acceptor. These conclusions are further elucidated by calculations of Rps. acidophila B800-B850 and a series of reconstituted complexes containing a systematically blue-shifted B800 absorption band. The role of dielectric effects is considered. It is reported that interaction of the B800 and B850;transition densities with the carotenoids has an effect on the B800-B850 electronic couplings. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 155 TC 296 Z9 306 U1 6 U2 58 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD MAR 2 PY 2000 VL 104 IS 8 BP 1854 EP 1868 DI 10.1021/jp993435l PG 15 WC Chemistry, Physical SC Chemistry GA 289VE UT WOS:000085642000024 ER PT J AU Royston, TJ Spohnholtz, T Ellingson, WA AF Royston, TJ Spohnholtz, T Ellingson, WA TI Use of non-degeneracy in nominally axisymmetric structures for fault detection with application to cylindrical geometries SO JOURNAL OF SOUND AND VIBRATION LA English DT Article ID CIRCULAR PLATES; EIGENSOLUTIONS; PERTURBATION AB A novel technique is proposed for the detection of localized flaws in otherwise axisymmetric structures. The technique is based on the split-mode phenomena that occurs when the degenerate vibratory modes of the axisymmetric structure become non-degenerate due to the flaw with altered mode shapes and shifted natural frequencies. A basic theoretical motivation is offered and computational and experimental studies on cylindrical structures are reported that verify the premises of the proposed methodology and provide an assessment of its specificity and sensitivity under confounding conditions, such as out-of-roundness. (C) 2000 Academic Press. C1 Univ Illinois, Chicago, IL 60607 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Royston, TJ (reprint author), Univ Illinois, Chicago, IL 60607 USA. RI Royston, Thomas/C-1285-2008 NR 9 TC 8 Z9 11 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD MAR 2 PY 2000 VL 230 IS 4 BP 791 EP 808 DI 10.1006/jsvi.1999.2653 PG 18 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA 292BC UT WOS:000085773400004 ER PT J AU Peng, XG Manna, L Yang, WD Wickham, J Scher, E Kadavanich, A Alivisatos, AP AF Peng, XG Manna, L Yang, WD Wickham, J Scher, E Kadavanich, A Alivisatos, AP TI Shape control of CdSe nanocrystals SO NATURE LA English DT Article ID QUANTUM DOTS; EXCITON; GROWTH; SEMICONDUCTORS; CD(II); RESINS; DARK AB Nanometre-size inorganic dots, tubes and wires exhibit a wide range of electrical and optical properties(1,2) that depend sensitively on both size and shape(3,4), and are of both fundamental and technological interest. In contrast to the syntheses of zero-dimensional systems, existing preparations of one-dimensional systems often yield networks of tubes or rods which are difficult to separate(5-12). And, in the case of optically active II-YI and III-V semiconductors, the resulting rod diameters are too large to exhibit quantum confinement effects(6,8-10). Thus, except for some metal nanocrystals(13), there are no methods of preparation that yield soluble and monodisperse particles that are quantum-confined in two of their dimensions. For semiconductors, a benchmark preparation is the growth of nearly spherical II-VI and III-V nanocrystals by injection of precursor molecules into a hot surfactant(14,15). Here we demonstrate that control of the growth kinetics of the II-VI semiconductor cadmium selenide can be used to vary the shapes of the resulting particles from a nearly spherical morphology to a rod-like one, with aspect ratios as large as ten to one. This method should be useful, not only for testing theories of quantum confinement, but also for obtaining particles with spectroscopic properties that could prove advantageous in biological labelling experiments(16,17) and as chromophores in light-emitting diodes(18,19). C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Peng, XG (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Han, Kyuhee/B-6201-2009; Manna, Liberato/G-2339-2010; Alivisatos , Paul /N-8863-2015; peng, xiaogang/R-6184-2016 OI Manna, Liberato/0000-0003-4386-7985; Alivisatos , Paul /0000-0001-6895-9048; peng, xiaogang/0000-0002-5606-8472 NR 30 TC 3389 Z9 3460 U1 154 U2 1411 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD MAR 2 PY 2000 VL 404 IS 6773 BP 59 EP 61 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 292BW UT WOS:000085775100042 ER PT J AU Cohn, JD Stewart, ED AF Cohn, JD Stewart, ED TI Non-abelian discrete gauge symmetries and inflation SO PHYSICS LETTERS B LA English DT Article ID LARGE-SCALE STRUCTURE; HYBRID INFLATION; DENSITY PERTURBATIONS; NATURAL INFLATION; ENTROPY CRISIS; SUPERSYMMETRY; SUPERGRAVITY AB Obtaining a potential flat enough to provide slow roll inflation is often difficult when gravitational effects are included. Non-abelian discrete gauge symmetries can guarantee the flatness of the inflaton potential in this case, and also provide special field values where inflation can end. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Illinois, Dept Astron, Urbana, IL 61801 USA. Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA. Fermi Natl Accelerator Lab, NASA, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea. RP Cohn, JD (reprint author), Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA. RI Stewart, Ewan/C-1565-2011 NR 23 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 2 PY 2000 VL 475 IS 3-4 BP 231 EP 235 DI 10.1016/S0370-2693(00)00089-7 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 291LF UT WOS:000085735100005 ER PT J AU Ackerstaff, K Airapetian, A Akopov, N Akushevich, I Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Bouwhuis, M Brack, J Brauksiepe, S Braun, B Bray, B Brons, S Bruckner, W Brull, A Bruins, EEW Bulten, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Fechtchenko, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Garber, Y Gao, H Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grooshauser, C Guidal, M Gute, A Gyurjyan, V Haas, JP Haeberli, W Hansen, JO Hartig, M Hasch, D Hausser, O Heinsius, FH Henderson, R Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kirsch, M Kisselev, A Kitching, P Kobayaski, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Krivokhijine, VG Kurisuno, M Kyle, G Lachnit, W Lenisa, P Lorenzon, W Makins, NCR Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, F Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Most, A Muccifora, V Mussa, R Nagaitsev, A Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, JM Nowak, WD Nupieri, M O'Neill, TG Openshaw, R Ouyang, J Owen, BR Papavassiliou, V Pate, SF Pitt, M Potashov, S Potterveld, DH Rakness, G Reali, A Redwine, R Reolon, AR Ristinen, R Rith, K Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Savin, I Scarlett, C Schafer, A Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA Shibatani, K Shin, T Shutov, V Simani, C Simon, A Sinram, K Slavich, P Spengos, M Steffens, E Stenger, J Stewart, J Stoesslein, U Sutter, M Tallini, H Taroian, S Terkulov, A Thomas, E Tipton, B Tytgat, M Urciuoli, GM van den Brand, JFJ van der Steenhoven, G van de Vyver, R van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Wander, W Wendland, J Wllliamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H AF Ackerstaff, K Airapetian, A Akopov, N Akushevich, I Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Bouwhuis, M Brack, J Brauksiepe, S Braun, B Bray, B Brons, S Bruckner, W Brull, A Bruins, EEW Bulten, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Fechtchenko, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Garber, Y Gao, H Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grooshauser, C Guidal, M Gute, A Gyurjyan, V Haas, JP Haeberli, W Hansen, JO Hartig, M Hasch, D Hausser, O Heinsius, FH Henderson, R Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kirsch, M Kisselev, A Kitching, P Kobayaski, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Krivokhijine, VG Kurisuno, M Kyle, G Lachnit, W Lenisa, P Lorenzon, W Makins, NCR Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, F Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Most, A Muccifora, V Mussa, R Nagaitsev, A Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, JM Nowak, WD Nupieri, M O'Neill, TG Openshaw, R Ouyang, J Owen, BR Papavassiliou, V Pate, SF Pitt, M Potashov, S Potterveld, DH Rakness, G Reali, A Redwine, R Reolon, AR Ristinen, R Rith, K Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Savin, I Scarlett, C Schafer, A Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA Shibatani, K Shin, T Shutov, V Simani, C Simon, A Sinram, K Slavich, P Spengos, M Steffens, E Stenger, J Stewart, J Stoesslein, U Sutter, M Tallini, H Taroian, S Terkulov, A Thomas, E Tipton, B Tytgat, M Urciuoli, GM van den Brand, JFJ van der Steenhoven, G van de Vyver, R van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Wander, W Wendland, J Wllliamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H CA HERMES Collaboration TI Nuclear effects on R = sigma(L)/sigma(T) in deep-inelastic scattering SO PHYSICS LETTERS B LA English DT Article ID STRUCTURE-FUNCTION RATIOS; R=SIGMA-L/SIGMA-T; ELECTRON-SCATTERING; ELECTROMAGNETIC CORRECTIONS; MUON SCATTERING; Q(2) DEPENDENCE; GLOBAL ANALYSIS; CROSS-SECTIONS; DISTRIBUTIONS; DEUTERIUM AB Cross section ratios for deep-inelastic scattering from N-14 and He-3 with respect to H-2 have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q(2) Varies from 0.5 to 15 GeV2. The data are compared to measurements performed by NMC, E665, and SLAG on He-4 and C-12, and rue found to be different for x < 0.06 and Q(2) < 1.5 GeV2. The observed difference is attributed to an A-dependence of the ratio R = sigma(L)/sigma(Gamma) of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q(2). (C) 2000 Elsevier Science B.V. All rights reserved. C1 DESY, Deutsch Elektronen Synchrotron, D-22603 Hamburg, Germany. Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA. Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA. DESY Zeuthen, D-15738 Zeuthen, Germany. Joint Inst Nucl Res, Dubna 141980, Russia. Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany. Univ Ferrara, 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. Florida Int Univ, Dept Phys, Miami, FL 33199 USA. Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany. State Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium. Max Planck Inst Kernphys, D-69029 Heidelberg, Germany. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA. Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Marburg, Inst Phys, D-35037 Marburg, Germany. MIT, Nucl Sci Lab, Cambridge, MA 02139 USA. Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. PN Lebedev Phys Inst, Moscow 117924, Russia. Univ Munich, Sekt Phys, D-85748 Garching, Germany. New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Petersburg Nucl Phys Inst, St Petersburg 188350, Russia. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany. Ist Super Sanita, Ist Nazl Fis Nucl, Sez 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. Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands. Yerevan Phys Inst, Yerevan 375036, Armenia. RP Ackerstaff, K (reprint author), DESY, Deutsch Elektronen Synchrotron, Notkestr 85, D-22603 Hamburg, Germany. RI Gao, Haiyan/G-2589-2011; Gavrilov, Gennady/C-6260-2013; Holt, Roy/E-5803-2011; Kozlov, Valentin/M-8000-2015; Terkulov, Adel/M-8581-2015; Cisbani, Evaristo/C-9249-2011; OI Cisbani, Evaristo/0000-0002-6774-8473; Heinsius, Fritz-Herbert/0000-0002-9545-5117 NR 48 TC 62 Z9 62 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 2 PY 2000 VL 475 IS 3-4 BP 386 EP 394 DI 10.1016/S0370-2693(99)01493-8 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 291LF UT WOS:000085735100026 ER PT J AU Ferris, MC Mesnier, MP More, JJ AF Ferris, MC Mesnier, MP More, JJ TI NEOS and condor: Solving optimization problems over the internet SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE algorithms; design; languages; performance; reliability; automatic differentiation; complementarity problems; computational servers; network computing; resource management ID AUTOMATIC DIFFERENTIATION; SERVER AB We discuss the use of Condor, a distributed resource management system, as a provider of computational resources for NEOS, an environment for solving optimization problems over the Internet. We also describe how problems are submitted and processed by NEOS, and then scheduled and solved by Condor on available (idle) workstations. C1 Univ Wisconsin, Dept Comp Sci, Madison, WI 53706 USA. Intel Corp, Hillsboro, OR 97123 USA. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Univ Wisconsin, Dept Comp Sci, 1210 W Dayton St, Madison, WI 53706 USA. EM ferris@cs.wisc.edu; mesnier@mcs.anl.gov; more@mcs.anl.gov NR 20 TC 28 Z9 28 U1 0 U2 1 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA SN 0098-3500 EI 1557-7295 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD MAR PY 2000 VL 26 IS 1 BP 1 EP 18 DI 10.1145/347837.347842 PG 18 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA 349LE UT WOS:000089045900001 ER PT J AU Bryan, JC Lavis, JM Hay, BP Sachleben, RA AF Bryan, JC Lavis, JM Hay, BP Sachleben, RA TI N-ethylazatribenzo-21-crown-7 SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID ALKALI AB The structure of the title compound, 25-ethyl-2,5,12,15,22,28-hexaoxa-25-azatetracyclo[27.4.0.0(6,11).0(16,21)] tritriaconta-1(29),- 6(11),7,9,16(21),17,19,30,32-nonaene, C28H33NO6, does not exhibit a binding cavity for cations, but is collapsed in on itself, The conformation is unique among known tribenzo-21-crown-7 structures, and may be a result of intermolecular (C-H ...pi) and intramolecular (C-H ... O) hydrogen bonding. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Pacific NW Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Bryan, JC (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD MAR PY 2000 VL 56 BP 391 EP 392 PN 3 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 305UR UT WOS:000086559400052 ER PT J AU Friar, JL Huber, D Witala, H Payne, GL AF Friar, JL Huber, D Witala, H Payne, GL TI Quartet n-d scattering lengths SO ACTA PHYSICA POLONICA B LA English DT Article ID NUCLEON; POTENTIALS AB Quartet n-d scattering lengths are calculated using second-generation nucleon-nucleon potential models. These results are compared to the corresponding quantity recently calculated using chiral perturbation theory. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. RP Friar, JL (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS PI KRAKOW PA REYMONTA 4, 30-059 KRAKOW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD MAR PY 2000 VL 31 IS 3 BP 749 EP 752 PG 4 WC Physics, Multidisciplinary SC Physics GA 296RU UT WOS:000086040200015 ER PT J AU Peles, JD Rhodes, OE Smith, MH AF Peles, JD Rhodes, OE Smith, MH TI Spermatozoan numbers and testicular characteristics of male white-tailed deer fawns during the mating season SO ACTA THERIOLOGICA LA English DT Article DE Odocoileus virginianus; spermatozoa; testes; body weight; kidney fat index; fawns ID HERD AB Testicular spermatozoan numbers, testes weight, testes length, body weight, and kidney fat index (KFI) were obtained for male white-tailed deer Odocoileus virginianus (Zimmerman, 1780) fawns during the mating season at the Savannah River Site (SRS) in South Carolina. Mean values for testicular spermatozoa, testes weight, and testes length increased significantly over the study period (late October - late December) whereas body weight and KFI did not change with time. Testicular spermatozoa were found in 28% of all fawns examined and the proportion of sexually mature Fawns increased greatly over the course of the study and was highest during December. These findings suggest that male Fawns breed later than adults at a time that coincides with the mean conception date in doe fawns. Testes weight, testes length, body weight, and KFI were significantly greater in fawns with testicular spermatozoa compared to those without testicular spermatozoa. We suggest that testes weight is closely associated with the presence of testicular spermatozoa in fawns from SRS. C1 Savannah River Ecol Lab, Aiken, SC 29802 USA. Purdue Univ, Dept Forestry & Nat Resources, W Lafayette, IN 47907 USA. RP Peles, JD (reprint author), Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 21 TC 3 Z9 3 U1 0 U2 4 PU POLISH ACAD SCIENCES PI BIALOWIEZA PA MAMMAL RESEARCH INST, 17-230 BIALOWIEZA, POLAND SN 0001-7051 J9 ACTA THERIOL JI Acta Theriol. PD MAR PY 2000 VL 45 IS 1 BP 95 EP 102 PG 8 WC Zoology SC Zoology GA 297FP UT WOS:000086071500009 ER PT J AU Das, S AF Das, S TI Aluminum tailor welded blanks SO ADVANCED MATERIALS & PROCESSES LA English DT Article C1 Oak Ridge Natl Lab, Div Energy, Oak Ridge, TN 37831 USA. RP Das, S (reprint author), Oak Ridge Natl Lab, Div Energy, POB 2008,Bldg 4500N, Oak Ridge, TN 37831 USA. NR 0 TC 10 Z9 10 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 USA SN 0882-7958 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD MAR PY 2000 VL 157 IS 3 BP 41 EP 42 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA 297CP UT WOS:000086064200005 ER PT J AU Tokonami, S Knutson, EO AF Tokonami, S Knutson, EO TI The scan time effect on the particle size distribution measurement in the scanning mobility particle sizer system SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article AB The scan time effect in the scanning mobility particle sizer was confirmed. The magnitude of this effect was shown in a typical situation. The cause of this scan time effect is the mixing process described by Russell et al, (1995). In that case, the result obtained at the longer scan time is the more accurate one. C1 Natl Inst Radiol Sci, Human Radiat Environm Div, Chiba 2638555, Japan. US Dept Energy, Environm Measurements Lab, New York, NY 10014 USA. RP Tokonami, S (reprint author), Natl Inst Radiol Sci, Human Radiat Environm Div, 4-9-1 Anagawa, Chiba 2638555, Japan. NR 3 TC 3 Z9 3 U1 0 U2 1 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD MAR PY 2000 VL 32 IS 3 BP 249 EP 252 DI 10.1080/027868200303786 PG 4 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 285NF UT WOS:000085394600009 ER PT J AU Brown, RA Rosenberg, NJ Hays, CJ Easterling, WE Mearns, LO AF Brown, RA Rosenberg, NJ Hays, CJ Easterling, WE Mearns, LO TI Potential production and environmental effects of switchgrass and traditional crops under current and greenhouse-altered climate in the central United States: a simulation study SO AGRICULTURE ECOSYSTEMS & ENVIRONMENT LA English DT Article DE biomass energy; climate change; central US; switchgrass; EPIC ID ATMOSPHERIC CARBON-DIOXIDE; BIOMASS ENERGY; EPIC MODEL; FEEDSTOCK; FUTURE; YIELD; CO2; USA; SENSITIVITY; AGRICULTURE AB If, as many climate change analysts' speculate, industrial and other emissions of CO2 can be offset by substitution of biofuels, large areas of land, including agricultural land, may be converted to the production of biomass feedstocks, This paper explores the feasibility for the Missouri-Iowa-Nebraska-Kansas (MINK) region of the US of converting some agricultural land to the production of switchgrass (Panicum virgatum L.), a perennial warm season grass, as a biomass energy crop. The erosion productivity impact calculator (EPIC) crop growth model simulated production of corn (Zen mays L.), sorghum (Sorghum bicolor (L,) Moench), soybean (Glycine max L,), winter wheat (Triticum aestivum L.) and switchgrass at 302 sites within the MINK region. The analysis is done for both current climatic conditions and a regional climate model-based scenario of possible climate change. Daily climate records from 1983 to 1993 served as baseline and the NCAR-RegCM2 model (RegCM hereafter) nested within the CSIRO general circulation model (GCM) provided the climate change scenario. Crop production was simulated at two atmospheric CO2 concentrations ([CO2]) at 365 and 560 ppm to consider the CO2-fertilization effect. Simulated yields of the perennial switchgrass increased at all sites with a mean yield increase of 5.0 Mg ha(-1) under the RegCM climate change scenario. Switchgrass yields benefited from temperature increases of 3.0-8.0 degrees C, which extended the growing season and reduced the incidence of cold stress. Conversely, the higher temperatures under the RegCM scenario decreased yields of corn, soybean, sorghum and winter wheat due to increased heat stress and a speeding of crop maturity. With no CO2-fertilization effect, EPIC simulated maximum decreases from baseline of 1.5 Mg ha(-1) for corn, 1.0 Mg ha(-1) for sorghum, 0.8 Mg ha(-1) for soybean and 0.5 Mg ha(-1) for winter wheat. Simulated yields increased for all crops under the RegCM scenario with CO2 set to 560 ppm. Yields increased above baseline for 34% of the soybean and 37% of the winter wheat farms under RegCM/[CO2] = 560 ppm scenario, Water use increased for all crops under the higher temperatures of the CSIRO scenario. Precipitation increases resulted in greater runoff from the traditional crops but not from switchgrass due to the crop' s increased growth and longer growing season. Simulated soil erosion rates tinder switchgrass and wheat cultivationwere less severe than under corn management. However, simulated erosion under switchgrass was considerable in eastern Iowa during the period of crop establishment because of strong winds at that time. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Battelle, Pacific NW Natl Lab, Washington, DC 20024 USA. Univ Nebraska, Dept Agr Meteorol, Lincoln, NE 68583 USA. Penn State Univ, Dept Geog, University Pk, PA 16802 USA. Natl Ctr Atmospher Res, Boulder, CO 80307 USA. RP Brown, RA (reprint author), Battelle, Pacific NW Natl Lab, 901 D St SW,Suite 900, Washington, DC 20024 USA. NR 45 TC 70 Z9 75 U1 1 U2 24 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8809 J9 AGR ECOSYST ENVIRON JI Agric. Ecosyst. Environ. PD MAR PY 2000 VL 78 IS 1 BP 31 EP 47 DI 10.1016/S0167-8809(99)00115-2 PG 17 WC Agriculture, Multidisciplinary; Ecology; Environmental Sciences SC Agriculture; Environmental Sciences & Ecology GA 280AG UT WOS:000085079000003 ER PT J AU Smith, SM Kress, TA Hart, WM AF Smith, SM Kress, TA Hart, WM TI Hand/wrist disorders among sign language communicators SO AMERICAN ANNALS OF THE DEAF LA English DT Article ID CARPAL-TUNNEL SYNDROME; INTERPRETERS AB The study assessed the frequency of self-reported hand/wrist problems among sign language communicators, including interpreters, deaf or hard-of-hearing individuals, and educators. Comparisons were also made between sign language communicators and the general population regarding the frequency of medically diagnosed carpal tunnel syndrome. A survey was mailed to attendees of a national conference that focused on the quality of postsecondary educational opportunities for students with hearing deficits. Fifty-nine percent of 184 respondents reported experiencing hand/wrist problems. Twenty-six percent reported experiencing hand/wrist problems severe enough to limit the ability to work, and 18% reported a medical diagnosis of wrist tendinitis, carpal tunnel syndrome, or both. The frequency of self-reported, medically diagnosed carpal tunnel syndrome for the surveyed sign language communicators was five times the rate experienced by working Americans between ages 18 and 60 years (Tanaka, Wild, Seigman, Halperin, Behrens, & Putz-Anderson, 1995). The study supports increased emphasis on and availability of hand/wrist disorder risk reduction programs for sign language users. C1 Univ Tennessee, Dept Hlth & Safety Sci, Knoxville, TN 37996 USA. Univ Tennessee, Dept Ind Engn, Knoxville, TN USA. Oak Ridge Associated Univ, Radiat Emergency Assistance Ctr & Training Site, Oak Ridge, TN USA. RP Smith, SM (reprint author), Univ Tennessee, Dept Hlth & Safety Sci, Knoxville, TN 37996 USA. NR 8 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN ANNALS OF THE DEAF PI WASHINGTON PA FOWLER HALL 409, 800 FLORIDA AVE NE, WASHINGTON, DC 20002 USA SN 0002-726X J9 AM ANN DEAF JI Am. Ann. Deaf PD MAR PY 2000 VL 145 IS 1 BP 22 EP 25 PG 4 WC Education, Special; Rehabilitation SC Education & Educational Research; Rehabilitation GA 310WV UT WOS:000086853200005 PM 10812686 ER PT J AU Viet, SM Torma-Krajewski, J Rogers, J AF Viet, SM Torma-Krajewski, J Rogers, J TI Chronic beryllium disease and beryllium sensitization at Rocky Flats: A case-control study SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article DE beryllium; epidemiology; job exposure matrix; nuclear weapons; occupational exposure limits AB A case-control study was conducted to evaluate the risk of chronic beryllium disease (CBD) and beryllium sensitization (SENS) associated with various levels of historical beryllium exposure at the Rocky Flats nuclear weapons facility Fifty CBD and 74 SENS cases were matched to controls of the same age group, race, gender, and smoking status. A job exposure matrix was developed from job history data and fixed airhead (FAH) exposure data available from 1960 to 1988. Job titles and building areas were assigned factors based on exposure relative to a machinist in the Building 444 Beryllium Shop. Concurrence on these factors was obtained from past and present Rocky Flats industrial hygienists. Using the matrix, long-term mean and cumulative exposures were estimated for each subject. Both exposure estimates (p < 0.0001) and years of employment (p = 0.010) were found to be significantly higher for CBD cases as compared with their controls, but not so for the SENS cases as compared with their controls. Logistic regression analyses showed statistically significant relationships between both cumulative and mean exposure and CBD, but not for SENS. These findings suggest that reduced worker exposures might lower the future incidence of CBD, but may not necessarily lower the incidence of SENS. C1 US Dept Energy, Golden, CO 80402 USA. Westat Inc, Rockville, MD 20850 USA. RP Viet, SM (reprint author), 40355 RCR 52, Steamboat Springs, CO 80487 USA. NR 12 TC 23 Z9 24 U1 0 U2 0 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 USA SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD MAR-APR PY 2000 VL 61 IS 2 BP 244 EP 254 DI 10.1202/0002-8894(2000)061<0244:CBDABS>2.0.CO;2 PG 11 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA 303ZQ UT WOS:000086458400012 PM 10782196 ER PT J AU Krauss, RM AF Krauss, RM TI Genetic recipes for heart-healthy diets SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Editorial Material ID CHOLESTEROL CONCENTRATION C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Donner Lab, Dept Mol Med, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Nutr Sci, Berkeley, CA 94720 USA. RP Krauss, RM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Donner Lab, Dept Mol Med, Berkeley, CA 94720 USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER SOC CLINICAL NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, SUBSCRIPTIONS, RM L-3300, BETHESDA, MD 20814-3998 USA SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD MAR PY 2000 VL 71 IS 3 BP 668 EP 669 PG 2 WC Nutrition & Dietetics SC Nutrition & Dietetics GA 287HC UT WOS:000085499600005 PM 10702156 ER PT J AU Green, LD Derr, JN Knight, A AF Green, LD Derr, JN Knight, A TI mtDNA affinities of the peoples of north-central Mexico SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID MITOCHONDRIAL-DNA; GENE-FREQUENCIES; AFRICAN POPULATIONS; ANALYSIS REVEALS; EVOLUTION; ADMIXTURE; LINEAGES; ANCIENT; AMERICA; ORIGIN AB mtDNA haplotypes of representatives of the cosmopolitan peoples of north-central Mexico were studied. Two hundred twenty-three samples from individuals residing in vicinities of two localities in north-central Mexico were analyzed. A combination of strategies was employed to identify the origin of each haplotype, including length variation analysis of the COII and tRNA(LYS) intergenic region, nucleotide sequence analysis of control region hypervariable segment 1, and RFLP analysis of PCR products spanning diagnostic sites. Analysis of these data revealed that the majority of the mtDNA haplotypes were of Native American origin, belonging to one of four primary Native American haplogroups. Others were of European or African origin, and the frequency of African haplotypes was equivalent to that of haplotypes of European derivation. These results provide diagnostic, discrete character, molecular genetic evidence that, together with results of previous studies of classical genetic systems, is informative with regard to both the magnitude of African admixture and the relative maternal contribution of African, European, and Native American peoples to the genetic heritage of Mexico. Phylogenetic analysis revealed that African sequences formed a basal, paraphyletic group. C1 Sul Ross State Univ, Dept Biol, Alpine, TX USA. Texas A&M Univ, Texas Vet Med Ctr, Dept Vet Pathobiol, College Stn, TX 77843 USA. RP Green, LD (reprint author), Univ Calif Los Alamos Natl Lab, Biosci Div, Mail Stop M888, Los Alamos, NM 87545 USA. NR 47 TC 66 Z9 66 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD MAR PY 2000 VL 66 IS 3 BP 989 EP 998 DI 10.1086/302801 PG 10 WC Genetics & Heredity SC Genetics & Heredity GA 337QM UT WOS:000088373200021 PM 10712213 ER PT J AU Godwin, RP Chapyak, EJ AF Godwin, RP Chapyak, EJ TI Resource Letter BD-1: Bubble dynamics SO AMERICAN JOURNAL OF PHYSICS LA English DT Letter ID CAVITATION BUBBLES; ACOUSTIC CAVITATION; LASER-ABLATION; SOLID BOUNDARY; SONOLUMINESCING BUBBLE; OPTICAL-BREAKDOWN; JET IMPACT; COLLAPSE; SINGLE; WATER AB This is one of a series of Resource Letters on different topics intended to guide college physicists, astronomers, and other scientists to some of the literature and other teaching aids that may help improve course content in specified fields. [The letter E after an item indicates elementary level or material of general interest to persons becoming informed in the field. The letter I, for intermediate level, indicates material of somewhat more specialized nature; and the letter A indicates rather specialized or advanced material.] No Resource Letter is meant to be exhaustive and complete; in time there may be more than one letter on some of the main subjects of interest. Comments on these materials as well as suggestions for future topics will be welcomed. Please send such communications to Professor Roger H. Stuewer, Editor, AAPT Resource Letters, School of Physics and Astronomy, 116 Church Street SE, University of Minnesota, Minneapolis, MN 55455. C1 Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA. RP Godwin, RP (reprint author), Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, POB 1663, Los Alamos, NM 87545 USA. NR 120 TC 2 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD MAR PY 2000 VL 68 IS 3 BP 211 EP 222 DI 10.1119/1.19425 PG 12 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA 287GU UT WOS:000085498800002 ER PT J AU Labotka, TC Cole, DR Riciputi, LR AF Labotka, TC Cole, DR Riciputi, LR TI Diffusion of C and O in calcite at 100 MPa SO AMERICAN MINERALOGIST LA English DT Article ID OXYGEN; CARBON; TEMPERATURES; EXCHANGE AB The diffusivities of C and O in calcite were determined in a purl CO2 atmosphere at 100 MPa and temperatures ranging from 600 to 800 degrees C. The calcite crystals were preannealed and H2O was excluded from the system to determine the self-diffusion coefficients. The CO2 consisted of 99% C-13 and 90% O-18. After heating for 7-147 d, diffusion profiles were measured with the use of secondary ion mass spectrometry. The results indicate that the diffusivity of C is D-C = 7.77 x 10(-9) exp (-166 +/- 16 kJ/mol/RT) cm(2)/s and of O is D-O = 7.5 x 10(-3) exp (-242 +/- 39 kJ/mol/RT) cm(2)/s. In comparison with other determinations of diffusivities in calcite, diffusion of O under the experimental conditions is consistent with vacancy migration in the intrinsic region, and diffusion of C seems to occur by diffusion of carbonate anions. Increased pressure appears to reduce the activation energy and the value of D-0, and the presence of H2O greatly increases the diffusivity of O without appreciably changing the activation energy. Closure temperatures calculated for isotopic exchange by diffusion predict that C isotope compositions of calcite are preserved during cooling in most geologic environments, but that O isotope compositions in H2O-rich environments are preserved only in rapidly cooling environments. such as contact metamorphic aureoles. C1 Univ Tennessee, Dept Geol Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Labotka, TC (reprint author), Univ Tennessee, Dept Geol Sci, Knoxville, TN 37996 USA. NR 20 TC 36 Z9 36 U1 1 U2 3 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1015 EIGHTEENTH ST, NW SUITE 601, WASHINGTON, DC 20036 USA SN 0003-004X J9 AM MINERAL JI Am. Miner. PD MAR-APR PY 2000 VL 85 IS 3-4 BP 488 EP 494 PG 7 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA 290XD UT WOS:000085702400010 ER PT J AU Elsetinow, AR Guevremont, JM Strongin, DR Schoonen, MAA Strongin, M AF Elsetinow, AR Guevremont, JM Strongin, DR Schoonen, MAA Strongin, M TI Oxidation of {100} and {111} surfaces of pyrite: Effects of preparation method SO AMERICAN MINERALOGIST LA English DT Article ID FRACTURED PYRITE; STATES; REACTIVITY; SULFUR AB Photoelectron spectroscopy was used to investigate the surface structure and reactivity of two pyrite {100} surfaces, prepared by different means. Specifically, synchrotron-based S 2p photoemission data for a {100} pyrite growth surface prepared by exposure to HCl, and one resulting from mechanical fracture suggested that the acid-washed growth surface showed a higher concentration of elemental sulfur and/or polysulfide impurities. The surfaces, however, showed a similar initial oxidation reactivity under a well-controlled H2O/O-2 gaseous environment, implying that the fraction of both surfaces that underwent the initial oxidation reaction were similar in structure. The amount of initial oxidation on these surfaces, however, was significantly lower than on an acid-washed {111} growth surface. Photoelectron and ion scattering spectroscopy offer some possible reasons for this structure sensitivity. C1 Temple Univ, Dept Chem, Philadelphia, PA 19122 USA. SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11974 USA. RP Elsetinow, AR (reprint author), Temple Univ, Dept Chem, Philadelphia, PA 19122 USA. RI Schoonen, martin/E-7703-2011 OI Schoonen, martin/0000-0002-7133-1160 NR 12 TC 31 Z9 31 U1 2 U2 23 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1015 EIGHTEENTH ST, NW SUITE 601, WASHINGTON, DC 20036 USA SN 0003-004X J9 AM MINERAL JI Am. Miner. PD MAR-APR PY 2000 VL 85 IS 3-4 BP 623 EP 626 PG 4 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA 290XD UT WOS:000085702400028 ER PT J AU Schaaff, TG Cargile, BJ Stephenson, JL McLuckey, SA AF Schaaff, TG Cargile, BJ Stephenson, JL McLuckey, SA TI Ion trap collisional activation of the (M+2H)(2+)-(M+17H)(17+) ions of human hemoglobin beta-chain SO ANALYTICAL CHEMISTRY LA English DT Article ID TANDEM MASS-SPECTROMETRY; MULTIPLY-CHARGED IONS; PROTON-TRANSFER REACTIONS; ELECTROSPRAY-IONIZATION; RESONANCE EJECTION; LARGE BIOMOLECULES; ION/ION REACTIONS; MIXTURE ANALYSIS; OXIDIZED GLOBIN; LARGE MOLECULES AB The parent ions of human hemoglobin beta-chain ranging in charge from 2+ to 17+ have been subjected to ion trap collisional activation. The highest charge-state ions (17+ to 13+) yielded series of products arising from dissociation of adjacent residues. The intermediate charge-state ions (12+ to 5+) tended to fragment preferentially at the N-terminal sides of proline residues and the C-terminal sides of acidic residues. Many, but not all, of the possible cleavages at proline, aspartic acid, and glutamic acid residues were represented in the spectra. The lowest charge-state ions were difficult to dissociate with high efficiency and yielded spectra with poorly defined product ion signals. This observation is attributed to sequential fragmentations arising from losses of small molecules such as water and/or ammonia. The poor fragmentation efficiency observed for the low charge states is due at least in part to the low trapping wells used to store the ions. Higher ion stabilities due to lower Coulombic repulsion and charges being sequestered at highly basic sites may also play an important role. Ion/ion proton-transfer reactions involving protein parent ions allows for the formation of a wide range of parent ion charge states. In addition, the ion/ion proton-transfer reactions involving protein dissociation products simplify interpretation of the product ion spectra. C1 Oak Ridge Natl Lab, Chem & Analyt Sci Div, Oak Ridge, TN 37831 USA. RP Stephenson, JL (reprint author), Oak Ridge Natl Lab, Chem & Analyt Sci Div, Oak Ridge, TN 37831 USA. RI Stephenson, James/A-9262-2009; McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 66 TC 64 Z9 65 U1 0 U2 2 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 MAR 1 PY 2000 VL 72 IS 5 BP 899 EP 907 DI 10.1021/ac991344e PG 9 WC Chemistry, Analytical SC Chemistry GA 289DK UT WOS:000085605100022 PM 10739190 ER PT J AU Tolmachev, AV Udseth, HR Smith, RD AF Tolmachev, AV Udseth, HR Smith, RD TI Charge capacity limitations of radio frequency ion guides in their use for improved ion accumulation and trapping in mass spectrometry SO ANALYTICAL CHEMISTRY LA English DT Article ID TIME; PAUL; DISSOCIATION AB The use of radio frequency (rf) ion guides as "linear" two-dimensional ion traps and ion guides for ion storage and accumulation, respectively, is becoming increasingly important for realizing improved sensitivity in mass spectrometry, Analytical relationships describing the ion accumulation operation mode of rf ion guides are reported, Comparisons are made between the rf quadrupole ion guide, higher-order rf multipoles and rf stacked ring ion guides, in terms of the charge capacity limitations due to the instability of ions, rf focusing efficiency limits, and effects due to rf ion heating (i.e., collisional activation due to rf oscillations of ions). Analytical relations for the stored charge quantity are derived in the low ion energy approximation, which is shown to be reasonable for the systems considered, The ion density spatial distribution is derived, an exponential form of which proved to provide a good approximation for high-order rf multipoles and stacked ring rf ion guides. The limit on the stored charge dependence upon rf is shown to be directly related to the thermal dissociation thresholds for the ions being studied; the limitation is weaker for higher-order multipoles and stacked ring ion guides. These results suggest that rf quadrupoles provide an optimum configuration when accumulation of a moderate ion density is sufficient (below 10(9) elementary charges/m), Alternatively, accumulation of an appreciable density for more fragile species, such as noncovalent complexes, may be realized using higher-order multipoles and stacked ring ion guides. C1 Pacific NW Natl Lab, Environm & Mol Sci Lab, Richland, WA 99352 USA. RP Pacific NW Natl Lab, Environm & Mol Sci Lab, POB 999, Richland, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NCRR NIH HHS [RR12365] NR 19 TC 40 Z9 40 U1 2 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 2000 VL 72 IS 5 BP 970 EP 978 DI 10.1021/ac990729u PG 9 WC Chemistry, Analytical SC Chemistry GA 289DK UT WOS:000085605100032 PM 10739200 ER PT J AU Mollah, S Pris, AD Johnson, SK Gwizdala, AB Houk, RS AF Mollah, S Pris, AD Johnson, SK Gwizdala, AB Houk, RS TI Identification of metal cations, metal complexes, and anions by electrospray mass spectrometry in the negative ion mode SO ANALYTICAL CHEMISTRY LA English DT Article ID ELEMENTAL ANALYSIS; AQUEOUS-SOLUTIONS; GAS-PHASE; SPECIATION; CHROMATOGRAPHY; IONIZATION; MATRIX AB Pneumatically assisted electrospray mass spectrometry (ES-MS) is used in the negative ion mode for aqueous metal (M) solutions in an excess of hydrochloric or nitric acid, where the major anion X = Cl- or NO3-. A collision energy of similar to 20 eV removes anion-solvent clusters for most elements and leaves negative complex ions of the general form (Mn+Yn+1)(-). Complexation with anions prevents charge reduction reactions at least to n = 3, even in cases where the third ionization energy of M greatly exceeds the first ionization energy of the solvent. These negative ions thus preserve the charge state of the metal cation from the solution and allow identification of both cations and anions in a single set of electrospray conditions. Cations such as Fe3+ or Cu2+ that have a lower oxidation state in solution produce a distribution of negative ions, each with a single negative charge overall; e.g., an Fe3+ solution produces both (FeX4-)-X-III and (FeX3-)-X-II. This distribution of Fe-III and Fen species is attributed to electrochemical reduction of Fe3+ at the negatively charged ES needle. "Native" anions such as perrhenate or molybdate produce singly charged analogues such as ReO4- or HMoO4- Metal-EDTA complexes are seen as (MY-)-Y-III Or (MHY-)-H-II. The sensitivity for these "native" anions is suppressed by competition with the excess chloride or nitrate used to produce the metal-containing complex ions. C1 Iowa State Univ, Dept Chem, Ames Lab, US Dept Energy, Ames, IA 50011 USA. RP Houk, RS (reprint author), Iowa State Univ, Dept Chem, Ames Lab, US Dept Energy, Ames, IA 50011 USA. NR 38 TC 41 Z9 41 U1 1 U2 29 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 MAR 1 PY 2000 VL 72 IS 5 BP 985 EP 991 DI 10.1021/ac9908647 PG 7 WC Chemistry, Analytical SC Chemistry GA 289DK UT WOS:000085605100034 ER PT J AU Herr, AE Molho, JI Santiago, JG Mungal, MG Kenny, TW Garguilo, MG AF Herr, AE Molho, JI Santiago, JG Mungal, MG Kenny, TW Garguilo, MG TI Electroosmotic capillary flow with nonuniform zeta potential SO ANALYTICAL CHEMISTRY LA English DT Article ID CHEMICAL-ANALYSIS SYSTEMS; ZONE ELECTROPHORESIS; DISPERSION; EFFICIENCY; SEPARATIONS; DRIVEN; FIELD; GLASS AB The present work is an analytical and experimental study of electroosmotic now (EOF) in cylindrical capillaries with nonuniform wall surface charge (xi-potential) distributions, In particular, this study investigates perturbations of electroosmotic flow in open capillaries that are due to induced pressure gradients resulting from axial variations in the wall xi-potential. The experimental inquiry focuses on electroosmotic now under a uniform applied field in capillaries with an EOF-suppressing polymer adsorbed onto various fractions of the total capillary length. This fractional EOF suppression was achieved by coupling capillaries with substantially different xi-potentials. The resulting now fields were imaged with a nonintrusive, caged-fluorescence imaging technique. Simple analytical models for the velocity field and rate of sample dispersion in capillaries with axial e-potential variations are presented. The resulting induced pressure gradients and the associated band-broadening effects are of particular importance to the performance of chemical and biochemical analysis systems such as capillary electrokinetic chromatography and capillary zone electrophoresis. C1 Stanford Univ, Stanford, CA 94305 USA. Sandia Natl Labs, Livermore, CA 94550 USA. RP Herr, AE (reprint author), Stanford Univ, Stanford, CA 94305 USA. NR 30 TC 282 Z9 283 U1 2 U2 55 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 MAR 1 PY 2000 VL 72 IS 5 BP 1053 EP 1057 DI 10.1021/ac990489i PG 5 WC Chemistry, Analytical SC Chemistry GA 289DK UT WOS:000085605100043 ER PT J AU Zamonsky, OM Buscaglia, GC Azmy, YY AF Zamonsky, OM Buscaglia, GC Azmy, YY TI A posteriori error estimation for the one-dimensional Arbitrarily High Order Transport-Nodal method SO ANNALS OF NUCLEAR ENERGY LA English DT Article ID SLAB GEOMETRY; EQUATIONS; APPROXIMATIONS; ADAPTIVITY AB An a posteriori error analysis of the spatial approximation is developed for the one-dimensional Arbitrarily High Order Transport-Nodal method. The error estimator, based on the L-2 norm of the error, preserves the order of convergence of the method when the mesh size tends to zero. The proposed error estimator is decomposed into error indicators to allow the quantification of local errors. A simple test problem with isotropic scattering is solved to compare the behavior of the true errors with the estimated errors. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Ctr Atom Bariloche, RA-8400 Bariloche, Rio Negro, Argentina. Inst Balseiro, RA-8400 Bariloche, Rio Negro, Argentina. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Zamonsky, OM (reprint author), Ctr Atom Bariloche, RA-8400 Bariloche, Rio Negro, Argentina. RI Buscaglia, Gustavo/F-5317-2010 OI Buscaglia, Gustavo/0000-0001-9567-403X NR 14 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD MAR PY 2000 VL 27 IS 4 BP 355 EP 369 DI 10.1016/S0306-4549(99)00071-7 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 275KG UT WOS:000084818900006 ER PT J AU Finkelstein, M Davison, BH AF Finkelstein, M Davison, BH TI Introduction to the proceedings of the twenty-first symposium on biotechnology for fuels and chemicals SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 Natl Renewable Energy Lab, Golden, CO USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Finkelstein, M (reprint author), Natl Renewable Energy Lab, Golden, CO USA. RI Davison, Brian/D-7617-2013 OI Davison, Brian/0000-0002-7408-3609 NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP III EP IV PG 2 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500001 ER PT J AU Wyman, CE Chornet, E Finkelstein, M AF Wyman, CE Chornet, E Finkelstein, M TI Feedstock production, characterization, and processing SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 Dartmouth Coll, BC Int, Hanover, NH 03755 USA. Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA. Natl Renewable Energy Lab, Sherbrooke, PQ, Canada. Univ Sherbrooke, Sherbrooke, PQ J1K 2R1, Canada. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Wyman, CE (reprint author), Dartmouth Coll, BC Int, Hanover, NH 03755 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 3 EP 4 PG 2 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500002 ER PT J AU Tucker, MP Mitri, RK Eddy, FP Nguyen, QA Gedvilas, LM Webb, JD AF Tucker, MP Mitri, RK Eddy, FP Nguyen, QA Gedvilas, LM Webb, JD TI Fourier transform infrared quantification of sugars in pretreated biomass liquors SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE Fourier transform infrared; biomass; hardwood; softwood; pretreatment; acid hydrolysis ID FTIR SPECTROSCOPY; SPECTROMETRY; LIGNIN; DRIFT AB The process of converting renewable lignocellulosic biomass to ethanol requires a number of steps, and pretreatment is one of the most important. Pretreatment usually involves a hydrolysis of the easily hydrolyzed hemicellulosic component of biomass using some form of thermal/chemical/mechanical action that results in a product that can be further hydrolyzed by cellulase enzymes (the cellulosic portion). The sugars produced can then be fermented to ethanol by fermentative microorganisms. If the pretreatment step is not severe enough, the resultant residue is not as easily hydrolyzed by the cellulase enzyme. More severe pretreatment conditions result in the production of degradation products that are toxic to the fermentative microorganism. In this article, we report the quantitative analysis of glucose, mannose, xylose, and acetic acid using Fourier transform infrared (FTIR) spectroscopy on liquors from dilute-acid-pretreated softwood and hardwood slurries. Comparison of FTIR and high-performance liquid chromatography quantitative analyses of these liquors are reported. Recent developments in infrared probe technology has enabled the rapid quantification of these sugars by FTIR spectroscopy in the batch reactor during optimization of the pretreatment conditions, or interfaced to the computer controlling a continuous reactor for on-line monitoring: and control. C1 Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. Univ Denver, Dept Chem, Denver, CO 80210 USA. RP Tucker, MP (reprint author), Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, 1617 Cole Blvd, Golden, CO 80401 USA. NR 27 TC 15 Z9 15 U1 0 U2 5 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 39 EP 50 DI 10.1385/ABAB:84-86:1-9:39 PG 12 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500004 PM 10849777 ER PT J AU Baker, JO King, MR Adney, WS Decker, SR Vinzant, TB Lantz, SE Nieves, RE Thomas, SR Li, LC Cosgrove, DJ Himmel, ME AF Baker, JO King, MR Adney, WS Decker, SR Vinzant, TB Lantz, SE Nieves, RE Thomas, SR Li, LC Cosgrove, DJ Himmel, ME TI Investigation of the cell-wall loosening protein expansin as a possible additive in the enzymatic saccharification of lignocellulosic biomass SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec ID EXPRESSION; GENE C1 Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. Penn State Univ, Dept Biol, Mueller Lab 208, University Pk, PA 16802 USA. RP Baker, JO (reprint author), Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, 1617 Cole Blvd, Golden, CO 80401 USA. NR 15 TC 26 Z9 28 U1 2 U2 8 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 217 EP 223 DI 10.1385/ABAB:84-86:1-9:217 PG 7 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500018 PM 10849790 ER PT J AU Lawford, HG Rousseau, JD Mohagheghi, A McMillan, JD AF Lawford, HG Rousseau, JD Mohagheghi, A McMillan, JD TI Continuous fermentation studies with xylose-utilizing recombinant Zymomonas mobilis SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE recombinant Zymomonas; continuous cofermentation; xylose; biomass hydrolysate; ethanol yield; acetic acid; maintenance coefficient ID ESCHERICHIA-COLI; ETHANOL-PRODUCTION; GLUCOSE-TRANSPORT; CONVERSION AB This study examined the continuous cofermentation performance characteristics of a dilute-acid "prehydrolysate-adapted" recombinant Zymomonas 39676:pZB4L and builds on the pH-stat batch fermentations with this recombinant that we reported on last year. Substitution of yeast extract by 1% (w/v) corn steep liquor (CSL) (50% solids) and Mg (2 mM) did not alter the cofermentation performance. Using declared assumptions, the cost of using CSL and Mg was estimated to be 12.5 cent/gal of ethanol with a possibility of 50% cost reduction using fourfold less CSL with 0.1% diammonium phosphate. Because of competition for a common sugar transporter that exhibits a higher affinity fur glucose, utilization of glucose was complete whereas xylose was always present in the chemostat effluent. The ethanol yield, based on sugar used, was 94% of theoretical maximum. Altering the sugar ratio of the synthetic dilute acid hardwood prehydrolysate did not appear to significantly change the pattern of xylose utilization. Using a criterion of 80% sugar utilization for determining the maximum dilution rate (D-max), changing the composition of the feed from 4% xylose to 3%, and simultaneously increasing the glucose from 0.8 to 1.8% shifted D-max from 0.07 to 0.08/h. With equal amounts of both sugars (2.5%), D-max was 0.07/h. By comparison to a similar investigation with rec Zm CP4:pZB5 with a 4% equal mixture of xylose and glucose, we observed that at pH 5.0, the D-max was 0.064/h and shifted to 0.084/h at pH 5.75. At a level of 0.4% (w/v) acetic acid in the CSL-based medium with 3% xylose and 1.8% glucose at pH 5.75, the D-max for the adapted recombinant shifted from 0.08 to 0.048/h, and the corresponding maximum volumetric ethanol productivity decreased 45%, from 1.52 to 0.84 g/(L.h). Under these conditions of continuous culture, linear regression of a Pirt plot of the specific rate of sugar utilization vs D showed that 4 g/L of acetic acid did not affect the maximum growth yield (0.030 g dry cell mass/g sugar), but did increase the maintenance coefficient twofold, from 0.46 to 1.0 g of sugar/(g of cell.h). C1 Univ Toronto, Dept Biochem, Bioengn Lab, Toronto, ON M5S 1A8, Canada. Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. RP Lawford, HG (reprint author), Univ Toronto, Dept Biochem, Bioengn Lab, 100 Coll St, Toronto, ON M5S 1A8, Canada. NR 28 TC 10 Z9 11 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 295 EP 310 DI 10.1385/ABAB:84-86:1-9:295 PG 16 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500025 PM 10849797 ER PT J AU Krishnan, MS Blanco, M Shattuck, CK Nghiem, NP Davison, BH AF Krishnan, MS Blanco, M Shattuck, CK Nghiem, NP Davison, BH TI Ethanol production from glucose and xylose by immobilized Zymomonas mobilis CP4(pZB5) SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE ethanol; recombinant Zymononas mobilis; xylose fermentation; immobilization; fluidized-bed bioreactor ID KLEBSIELLA-OXYTOCA; ESCHERICHIA-COLI; PICHIA-STIPITIS; FERMENTATION; BIOREACTOR; PATHWAY AB Fermentation of glucose-xylose mixtures to ethanol was investigated in batch and continuous experiments using immobilized recombinant Zymomonas mobilis CP4(pZB5). This microorganism was immobilized by entrapment in kappa-carrageenan beads having a diameter of 1.5-2.5 mm. Batch experiments showed that the immobilized cells cofermented glucose and xylose to ethanol and that the presence of glucose improved the xylose utilization rate. Batch fermentation of rice straw hydrolysate containing 76 g/L of glucose and 33.8 g/L of xylose gave an ethanol concentration of 44.3 g/L after 24 h, corresponding to a yield of 0.46 g of ethanol/g of sugars. Comparable results were achieved with a synthetic sugar control. Continuous fermentation experiments were performed in a laboratory-scale fluidized-bed bioreactor (FBR). Glucose-xylose feed mixtures were pumped through the FBR at residence times of 2-4 h. Glucose conversion to ethanol was maintained above 98% in all experiments. Xylose conversion to ethanol was highest at 91.5% for a feed containing 50 g/L of glucose and 13 g/L of xylose at a dilution rate of 0.24/h. The xylose conversion to ethanol decreased with increasing feed xylose concentration, dilution rate, and age of the immobilized cells. Volumetric ethanol productivities in the range of 6.5-15.3 g/L.h were obtained. The improved productivities achieved in the FBR compared to other bioreactor systems can help in reducing the production costs of fuel ethanol from lignocellulosic sugars. C1 Oak Ridge Natl Lab, Bioproc Res & Dev Ctr, Oak Ridge, TN 37831 USA. RP Nghiem, NP (reprint author), Oak Ridge Natl Lab, Bioproc Res & Dev Ctr, POB 2008, Oak Ridge, TN 37831 USA. RI Davison, Brian/D-7617-2013 OI Davison, Brian/0000-0002-7408-3609 NR 20 TC 31 Z9 34 U1 0 U2 3 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 525 EP 541 DI 10.1385/ABAB:84-86:1-9:525 PG 17 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500046 PM 10849817 ER PT J AU Nguyen, QA Tucker, MP Keller, FA Eddy, FP AF Nguyen, QA Tucker, MP Keller, FA Eddy, FP TI Two-stage dilute-acid pretreatment of softwoods SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE softwood; pretreatment; acid hydrolysis; enzymatic hydrolysis; ethanol AB Whole tree chips obtained from softwood forest thinnings were pretreated via single- and two-stage dilute-sulfuric acid pretreatment. Whole-free chips were impregnated with dilute sulfuric acid and steam treated in a 4-L steam explosion react-or. In single-stage pretreatment, wood chips were treated using a wide range of severity. In two-stage pretreatment, the first stage was carried out at: low severity to maximize hemicellulose recovery. Solubilized sugars were recovered from the first-stage prehydrolysate by washing with water. Tn the second stage, water-insoluble solids from first-stage prehydrolysate were impregnated with dilute sulfuric acid, then steam treated at more severe conditions to hydrolyze a portion of the remaining cellulose to glucose and to improve the enzyme digestibility. The total sugar yields obtained after enzymatic hydrolysis of two-stage dilute acid-pretreated samples were compared with sugar yields from single-stage pretreatment. The overall sugar yield from two-stage dilute-acid pretreatment was approx 10% higher, and the net enzyme requirement was reduced by about 50%. Simultaneous saccharification and fermentation using an adapted Saccharomyces cerevisiae yeast strain further improved cellulose conversion yield and lowered the enzyme requirement. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Nguyen, QA (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 7 TC 162 Z9 167 U1 1 U2 26 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 561 EP 576 DI 10.1385/ABAB:84-86:1-9:561 PG 16 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500048 PM 10849819 ER PT J AU Hayward, TK Hamilton, J Tholudar, A McMillan, JD AF Hayward, TK Hamilton, J Tholudar, A McMillan, JD TI Improvements in titer, productivity, and yield using Solka-Floc for cellulase production SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE cellulase; Trichoderma reesei L27; aeration; agitation; oxygen supplementation AB Researchers studying cellulase enzymes for the economical production of fuel ethanol envision cellulose as the carbon source. However, submerged Trichoderma reesei cultures grown on cellulose exhibit high run-to-run variability. Thus, an investigation of 30 batch cellulase production experiments was instrumental in determining fermentation conditions that improved enzyme titers, yields, and productivities. Eighteen of the 30 batch experiments experienced minimal process upsets and were classified into eight groups based on agitation rate, gas sparge rate, and the use of oxygen supplementation. Comparing corn steep liquor with yeast extract/peptone also tested the effect of different sources of nitrogen in the media. Average 7-d enzyme titers were doubled from 4 to 8 FPU/mL primarily by increasing aeration. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP McMillan, JD (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 7 TC 18 Z9 20 U1 0 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 859 EP 874 DI 10.1385/ABAB:84-86:1-9:859 PG 16 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500072 PM 10849843 ER PT J AU Thompson, DN Fox, SL Bala, CA AF Thompson, DN Fox, SL Bala, CA TI Biosurfactants from potato process effluents SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 21st Sympsoium on Biotechnology for Fuels and Chemicals CY MAY 02-06, 1999 CL FT COLLINS, COLORADO SP US DOE Off Fuels Dev, US DOE Off Ind Technologies, Natl Renewable Energy Lab, Oak Ridge Natl Lab, Idaho Natl Engn & Environm Lab, Lockheed Martin Energy Res, AE Staley, Amer Chem Soc, Div Biochem Techn, BC Int, BF Goodrich, Cargill, Colorado Inst Res Biotechnol, Coors Brewing Co, EI DuPont Nemours & Co, Iogen Corp, Katzen Assoc Int Inc, Nat Resources, Canada, Pure Energy, Raphael Katzen, Tembec DE Bacillus subtilis; biosurfactant; surfactin; alternate feedstock; potato; enhanced oil recovery ID MICROBIAL SURFACTANTS; BACILLUS-SUBTILIS; BIODEGRADATION; MICROORGANISMS; DEGRADATION; DISSOLUTION; POLLUTANTS; RECOVERY; REMOVAL; SOIL AB High-solids (HS) and low-solids (LS) potato process effluents were tested as substrates for surfactin production. Tests used effluents diluted 1:10, unamended and amended with trace minerals or corn steep liquor. Heat pretreatment was necessary for surfactin production from effluents due to indigenous bacteria, whose spores remained after autoclaving. Surfactin production from LS surpassed HS in all cases. Surfactin yields from LS were 66% lower than from a pure culture in an optimized potato starch medium. LS could potentially be used without sterilization for surfactin production for low-value applications such as environmental remediation or oil recovery. C1 Idaho Natl Engn & Environm Lab, Dept Biotechnol, Idaho Falls, ID 83415 USA. RP Thompson, DN (reprint author), Idaho Natl Engn & Environm Lab, Dept Biotechnol, POB 1625, Idaho Falls, ID 83415 USA. NR 32 TC 32 Z9 34 U1 0 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 917 EP 930 DI 10.1385/ABAB:84-86:1-9:917 PG 14 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500077 PM 10849846 ER PT J AU Monceaux, DA McMillan, JD AF Monceaux, DA McMillan, JD TI Advances in scale-up, separation technology, and downstream processing SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 Natl Renewable Energy Lab, Golden, CO USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 2000 VL 84-6 BP 1047 EP 1048 PG 2 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 317DR UT WOS:000087211500088 ER PT J AU Brubaker, MA Yakymyshyn, CP AF Brubaker, MA Yakymyshyn, CP TI Pockels cell voltage probe for noninvasive electron-beam measurements SO APPLIED OPTICS LA English DT Article AB Accurate measurements of beam position and current are critical for the operation of the high-energy electron accelerators used for radiographic applications. Traditional short-pulse (e.g., 70 ns) machines utilize B-dot loops to monitor these parameters with great success. For long-pulse (e.g., 2 mu s) accelerators, beam position and current measurements become more challenging and may require new technology. A novel electro-optic voltage probe has been developed for this application and provides the advantages of complete galvanic isolation, excellent low-frequency performance, and no time integration requirement. The design of a prototype sensor is presented along with preliminary accelerator test data. (C) 2000 Optical Society of America. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Montana State Univ, Bozeman, MT 59717 USA. RP Brubaker, MA (reprint author), Los Alamos Natl Lab, Grp DX-8,Mail Stop P939, Los Alamos, NM 87545 USA. EM brubaker@lanl.gov NR 6 TC 1 Z9 1 U1 0 U2 2 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 MAR 1 PY 2000 VL 39 IS 7 BP 1164 EP 1167 DI 10.1364/AO.39.001164 PG 4 WC Optics SC Optics GA 286UM UT WOS:000085467200013 PM 18337999 ER PT J AU Knight, AK Scherbarth, NL Cremers, DA Ferris, MJ AF Knight, AK Scherbarth, NL Cremers, DA Ferris, MJ TI Characterization of laser-induced breakdown spectroscopy (LIBS) for application to space exploration SO APPLIED SPECTROSCOPY LA English DT Article DE laser-induced breakdown spectroscopy; LIES; laser spark; soil analysis; space exploration ID SHOCK-WAVE PLASMA; ELEMENTAL ANALYSIS; EMISSION; ROCKS; SURFACES; SAMPLES AB Early in the next century, several space missions are planned with the goal of landing craft on asteroids, comets, the Moon, and Mars. To increase the scientific return of these missions, new methods are needed to provide (1) significantly more analyses per mission lifetime, and (2) expanded analytical capabilities. One method that has the potential to meet both of these needs for the elemental analysis of geological samples is laser-induced breakdown spectroscopy (LIBS), These capabilities are possible because the laser plasma provides rapid analysis and the laser pulse can be focused on a remotely located sample to perform a stand-off measurement. Stand-off is defined as a distance up to 20 m between the target and laser. Here we present the results of a characterization of LIES for the stand-off analysis of soils at reduced air pressures and in a simulated Martian atmosphere (5-7 torr pressure of CO2) showing the feasibility of LIES for space exploration. For example, it is demonstrated that an analytically useful laser plasma can be generated at distances up to 19 m by using only 35 mJ/pulse from a compact laser. Some characteristics of the laser plasma at reduced pressure were also investigated. Temporally and spectrally resolved imaging show ed significant changes in the plasma as the pressure was reduced and also showed that the analyte signals and mass ablated from a target were strongly dependent on pressure, As the pressure decreased from 590 torr to the 40-100 torr range, the signals increased by a factor of about 3-4, and as the pressure was further reduced the signals decreased. This behavior can be explained by pressure-dependent changes in the mass of material vaporized and the frequency of collisions between species in the plasma. Changes in the temperature and the electron density of the plasmas with pressure were also examined and detection limits for selected elements were determined. C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Grp CST1, Los Alamos, NM 87545 USA. RP Cremers, DA (reprint author), Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Grp CST1, MS J565, Los Alamos, NM 87545 USA. NR 27 TC 202 Z9 211 U1 4 U2 55 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAR PY 2000 VL 54 IS 3 BP 331 EP 340 DI 10.1366/0003702001949591 PG 10 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 301GK UT WOS:000086302200003 ER PT J AU Jensen, TR Van Duyne, RP Johnson, SA Maroni, VA AF Jensen, TR Van Duyne, RP Johnson, SA Maroni, VA TI Surface-enhanced infrared spectroscopy: A comparison of metal island films with discrete and nondiscrete surface plasmons SO APPLIED SPECTROSCOPY LA English DT Article DE infrared spectroscopy; surface-enhanced infrared absorption; plasmon; SEIRA ID ABSORPTION-SPECTROSCOPY; SPECTRA; SPECTROMETRY; MONOLAYERS; AG; AU AB A study of the surface-enhanced infrared absorption (SEIRA) spectroscopy of para-nitrobenzoic acid (PNBA) adsorbed on thermally evaporated silver films has been conducted to determine the effect of film architecture on the magnitude of the SEIRA enhancement, Ordered arrays of uniformly sized silver nanoparticles, termed periodic particle arrays (PPAs), were prepared on several different infrared transparent substrates (germanium, silicon, and mica) by nanosphere lithography (NSL), It was found that the ordered arrays deposited by NSL produced sell-defined and intense surface plasmon resonance (SPR) bands in the infrared at frequencies between 1500 and 4000 cm(-1), The peak frequency of these infrared SPR bands depended on the array architecture and the substrate material. By appropriate design of the nanoparticle array, the infrared SPR band can be made to be coincident with the SEIRA sensitive infrared bands of the PNBA. The trends in the infrared SPR peak frequencies and band shapes were consistent with predictions from electrodynamic theory. The SEIRA responses per unit area of deposited metal obtained with the PPA-type films were at best comparable to results obtained with disordered silver and gold films deposited on the same substrate materials by thermal evaporation (i.e., in the absence of any NSL masking spheres). The results of this study are most consistent with theories and models that attribute SEIRA to the dielectric constant and optical extinction spectrum of the metal film. C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Van Duyne, RP (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA. NR 20 TC 127 Z9 128 U1 4 U2 53 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAR PY 2000 VL 54 IS 3 BP 371 EP 377 DI 10.1366/0003702001949654 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 301GK UT WOS:000086302200009 ER PT J AU Jenks, CJ Burnett, JW Delaney, DW Lograsso, TA Thiel, PA AF Jenks, CJ Burnett, JW Delaney, DW Lograsso, TA Thiel, PA TI Effect of sputtering gas on the surface composition of an Al-Pd-Mn quasicrystal SO APPLIED SURFACE SCIENCE LA English DT Article DE sputtering; surface composition; Al-Pd-Mn ID ENERGY-ELECTRON DIFFRACTION; QUASI-CRYSTALS; ION-BOMBARDMENT; CU ALLOYS; ALPDMN; LEED AB We demonstrate the effects of different inert sputtering gases on the surface composition of icosahedral (i-) Al-Pd-Mn. The sputtering gases used include He, Ne, Ar, Xe, and Kr. We demonstrate that the steady-state composition is independent of the inert gas chosen. This steady-state composition falls outside of the quasicrystalline region of the Al-Pd-Mn phase diagram. However, the fluence (ions/cm(2)) to achieve steady-state depends on the inert gas. Helium requires a much higher fluence than the other gases. Because of this, He can be used to clean the surface, if the time (fluence) for sputtering is kept to a minimum, without causing the large compositional shift induced with a relatively small fluence by the most common sputtering gas, Ar. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Iowa State Univ, Ames Lab, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Dept Mat Sci, Ames, IA 50011 USA. RP Jenks, CJ (reprint author), Iowa State Univ, Ames Lab, Dept Chem, Ames, IA 50011 USA. EM cjenks@iastate.edu NR 33 TC 19 Z9 19 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAR PY 2000 VL 157 IS 1-2 BP 23 EP 28 DI 10.1016/S0169-4332(99)00526-7 PG 6 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 296DP UT WOS:000086008000004 ER PT J AU Jarnagin, R Schwedler, M McBride, M Howley, JG Skalko, SV AF Jarnagin, R Schwedler, M McBride, M Howley, JG Skalko, SV TI The new standard 90.1 SO ASHRAE JOURNAL LA English DT Article AB In a fitting tribute to the new millennium, ASHRAE issued ASHRAE/IESNA Standard 90.1-1999, Energy Standard for Buildings Except Low-Rise Residential Buildings at the Winter Meeting in Dallas in February. This new version of Standard 90.1 represents ten years of effort on the part of the project committee that completely revised the previous 1989 version of the standard. C1 Pacific NW Natl Lab, Richland, WA USA. Owens Corning, Granville, OH USA. Codes Portland Cement Assoc, Macon, GA USA. Trane Co, La Crosse, WI USA. GE Lighting, Cleveland, OH USA. RP Jarnagin, R (reprint author), Pacific NW Natl Lab, Richland, WA USA. NR 0 TC 0 Z9 0 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 MAR PY 2000 VL 42 IS 3 BP 31 EP 33 PG 3 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA 305NZ UT WOS:000086548300004 ER PT J AU Nelson, CA Cook, KH Popowski, P Alves, DR AF Nelson, CA Cook, KH Popowski, P Alves, DR TI The distance to the Large Magellanic Cloud via the eclipsing binary HV 2274 SO ASTRONOMICAL JOURNAL LA English DT Article DE distance scale; dust, extinction; Magellanic Clouds; stars : fundamental parameters techniques : photometric ID ABSOLUTE DIMENSIONS; STANDARD STARS; PHOTOMETRY; MODULUS AB We present UBV photometry of the eclipsing binary Harvard Variable 2274 in the Large Magellanic Cloud (LMC). The stellar parameters of this binary system were recently calculated by Guinan et al., who gave both a reddening toward HV 2274 of E(B - V) = 0.083 +/- 0.006 and a distance modulus to the LMC of mu(LMC) = 18.42 +/- 0.07. The reddening of this system was also determined by Udalski et al., who found E(B - V)= 0.149 +/- 0.015. With Udalski et al. B and V photometry, Guinan et al. obtained E(B - V) = 0.12 +/- 0.009 and mu(LMC) = 18.30 +/- 0.07. Using our UBV photometry, we derive a reddening of E(B - V) = 0.088 +/- 0.023, consistent with the original value of Guinan et al. and supporting a longer distance modulus to the LMC of about mu(LMC) = 18.40 +/- 0.07. We stress the uncertainties inherent in ground-based UBV photometry and the concomitant uncertainties in determining distances based upon such photometry. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Space Telescope Sci Inst, Baltimore, MD 21218 USA. RP Nelson, CA (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94550 USA. NR 25 TC 28 Z9 28 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD MAR PY 2000 VL 119 IS 3 BP 1205 EP 1213 DI 10.1086/301268 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 297CA UT WOS:000086062900015 ER PT J AU Drinkwater, MJ Phillipps, S Jones, JB Gregg, MD Deady, JH Davies, JI Parker, QA Sadler, EM Smith, RM AF Drinkwater, MJ Phillipps, S Jones, JB Gregg, MD Deady, JH Davies, JI Parker, QA Sadler, EM Smith, RM TI The Fornax spectroscopic survey I. Survey strategy and preliminary results on the redshift distribution of a complete sample of stars and galaxies SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE astrometry; galaxies : active; galaxies : statistics; stars : statistics; surveys; techniques : spectroscopic ID SURFACE-BRIGHTNESS GALAXIES; DWARF GALAXIES; LUMINOSITY FUNCTIONS; GALACTIC STRUCTURE; THICK DISK; MILKY-WAY; CLUSTER; CATALOG; PHOTOMETRY; POPULATION AB The Fornax Spectroscopic Survey will use the Two degree Field spectrograph (2dF) of the Angle-Australian Telescope to obtain spectra for a complete sample of all 14000 objects with 16.5 less than or equal to b(j) less than or equal to 19.7 in a 12 square degree area centred on the Fornax Cluster. The aims of this project include the study of dwarf galaxies in the cluster (both known low surface brightness objects and putative normal surface brightness dwarfs) and a comparison sample of background field galaxies. We will also measure quasars and other active galaxies, any previously unrecognised compact galaxies and a large sample of Galactic stars. By selecting all objects-both stars and galaxies-independent of morphology, we cover a much larger range of surface brightness and scale size than previous surveys. In this paper we first describe the design of the survey. Our targets are selected from UK Schmidt Telescope sky survey plates digitised by the Automated Plate Measuring (APM) facility. We then describe the photometric and astrometric calibration of these data and show that the APM astrometry is accurate enough for use with the 2dF. We also describe a general approach to object identification using cross-correlations which allows us to identify and classify both stellar and galaxy spectra. We present results from the first 2dF field. Redshift distributions and velocity structures are shown for all observed objects in the direction of Fornax, including Galactic stars? galaxies in and around the Fornax Cluster, and for the background galaxy population. The velocity data for the stars show the contributions from the different Galactic components, plus a small tail to high velocities. We find no galaxies in the foreground to the cluster in our 2dF field. The Fornax Cluster is clearly defined kinematically. The mean velocity from the 26 cluster members having reliable redshifts is 1560 +/- 80 km s(-1). They show a velocity dispersion of 380 +/- 50 km s(-1). Large-scale structure can be traced behind the cluster to a redshift beyond z = 0.3. Background compact galaxies and low surface brightness galaxies are found to follow the general galaxy distribution. C1 Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia. Univ Bristol, Dept Phys, Bristol BS8 1TL, Avon, England. Univ Calif Davis, Livermore, CA 94550 USA. Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Univ Wales Coll Cardiff, Dept Phys & Astron, Cardiff CF2 3YB, S Glam, Wales. Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland. Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia. RP Drinkwater, MJ (reprint author), Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia. RI Drinkwater, Michael/A-2201-2008; OI Drinkwater, Michael/0000-0003-4867-0022; Sadler, Elaine/0000-0002-1136-2555; Phillipps, Steven/0000-0001-5991-3486 NR 81 TC 60 Z9 61 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAR PY 2000 VL 355 IS 3 BP 900 EP 914 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 311DG UT WOS:000086869100012 ER PT J AU Andres, E Askebjer, P Barwick, SW Bay, R Bergstrom, L Biron, A Booth, J Bouchta, A Carius, S Carlson, M Cowen, D Dalberg, E DeYoung, T Ekstrom, P Erlandson, B Goobar, A Gray, L Hallgren, A Halzen, F Hardtke, R Hart, S He, Y Heukenkamp, H Hill, G Hulth, PO Hundertmark, S Jacobsen, J Jones, A Kandhadai, V Karle, A Koci, B Lindahl, P Liubarsky, I Leuthold, M Lowder, DM Marciniewski, P Mikolajski, T Miller, T Miocinovic, P Mock, P Morse, R Niessen, P de los Heros, CP Porrata, R Potter, D Price, PB Przybylski, G Richards, A Richter, S Romenesko, P Rubinstein, H Schneider, E Schmidt, T Schwarz, R Solarz, M Spiczak, GM Spiering, C Streicher, O Sun, Q Thollander, L Thon, T Tilav, S Walck, C Wiebusch, C Wischnewski, R Woschnagg, K Yodh, G AF Andres, E Askebjer, P Barwick, SW Bay, R Bergstrom, L Biron, A Booth, J Bouchta, A Carius, S Carlson, M Cowen, D Dalberg, E DeYoung, T Ekstrom, P Erlandson, B Goobar, A Gray, L Hallgren, A Halzen, F Hardtke, R Hart, S He, Y Heukenkamp, H Hill, G Hulth, PO Hundertmark, S Jacobsen, J Jones, A Kandhadai, V Karle, A Koci, B Lindahl, P Liubarsky, I Leuthold, M Lowder, DM Marciniewski, P Mikolajski, T Miller, T Miocinovic, P Mock, P Morse, R Niessen, P de los Heros, CP Porrata, R Potter, D Price, PB Przybylski, G Richards, A Richter, S Romenesko, P Rubinstein, H Schneider, E Schmidt, T Schwarz, R Solarz, M Spiczak, GM Spiering, C Streicher, O Sun, Q Thollander, L Thon, T Tilav, S Walck, C Wiebusch, C Wischnewski, R Woschnagg, K Yodh, G TI The AMANDA neutrino telescope: principle of operation and first results SO ASTROPARTICLE PHYSICS LA English DT Article ID DETECTOR; PERFORMANCE; INTENSITY; ICE AB AMANDA is a high-energy neutrino telescope presently under construction at the geographical South Pole. In the Antarctic summer 1995/96, an array of 80 optical modules (OMs) arranged on 4 strings (AMANDA-B4) was deployed at depths between 1.5 and 2 km. In this paper we describe the design and performance of the AMANDA-B4 prototype, based on data collected between February and November 1996. Monte Carlo simulations of the detector response to down-going atmospheric muon tracks show that the global behavior of the detector is understood. We describe the data analysis method and present first results on atmospheric muon reconstruction and separation of neutrino candidates. The AMANDA array was upgraded with 216 OMs on 6 new strings in 1996/97 (AMANDA-B10), and 122 additional OMs on 3 strings in 1997/98. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Irvine, Irvine, CA 92717 USA. Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA. DESY, Zeuthen, Germany. Kalmar Univ, Kalmar, Sweden. Stockholm Univ, S-10691 Stockholm, Sweden. Univ Calif Berkeley, Berkeley, CA 94720 USA. Univ Penn, Philadelphia, PA 19104 USA. Univ Wisconsin, Madison, WI 53706 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Uppsala, S-75105 Uppsala, Sweden. RP Barwick, SW (reprint author), Univ Calif Irvine, Irvine, CA 92717 USA. RI Wiebusch, Christopher/G-6490-2012; Hundertmark, Stephan/A-6592-2010; Hallgren, Allan/A-8963-2013; Przybylski, Grzegorz/F-7474-2015; OI Wiebusch, Christopher/0000-0002-6418-3008; Streicher, Ole/0000-0001-7751-1843; Perez de los Heros, Carlos/0000-0002-2084-5866 NR 47 TC 178 Z9 178 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-6505 J9 ASTROPART PHYS JI Astropart Phys. PD MAR PY 2000 VL 13 IS 1 BP 1 EP 20 DI 10.1016/S0927-6505(99)00092-4 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 287XG UT WOS:000085532300001 ER PT J AU Haiman, Z Menou, K AF Haiman, Z Menou, K TI On the cosmological evolution of the luminosity function and the accretion rate of quasars SO ASTROPHYSICAL JOURNAL LA English DT Article DE accretion, accretion disks; black hole physics; cosmology : theory; quasars : general ID BLACK-HOLES; GALACTIC NUCLEI; GALAXY; DISKS; OBJECTS; MODELS; POPULATION; UNIVERSE AB We consider a class of models for the redshift evolution (between 0 less than or similar to z less than or similar to 4) of the observed optical and X-ray quasar luminosity functions (LFs), with the following assumptions: (1) the mass function of dark matter halos follows the Press-Schechter theory, (2) the black hole (BH) mass scales linearly with the halo mass, (3) quasars have a constant universal lifetime, and (4) a thin accretion disk provides the optical luminosity of quasars, while the X-ray/optical flux ratio is calibrated from a sample of observed quasars. The mass accretion rate, hi, onto quasar BHs is a free parameter of the models, which we constrain using the observed LFs. The accretion rate M inferred from either the optical or X-ray data under these assumptions generally decreases as a function of cosmic time from z similar or equal to 4 to z similar or equal to 0. We find that a comparable accretion rate is inferred from the X-ray and optical LF only if the X-ray/optical flux ratio decreases with BH mass. Near z similar or equal to 0, M drops to substantially sub-Eddington values at which advection-dominated accretion flows (ADAFs) exist. Such a decline of hi, possibly followed by a transition to radiatively inefficient ADAFs, could explain both the absence of bright quasars in the local universe and the faintness of accreting BHs at the centers of nearby galaxies. Vile argue that a decline of the accretion rate of the quasar population is indeed expected in cosmological structure formation models. C1 NASA, Fermi Natl Accelerator Lab, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA. Observ Paris, CNRS, DARC, F-92195 Meudon, France. RP Haiman, Z (reprint author), NASA, Fermi Natl Accelerator Lab, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. EM zoltan@fnal.gov; kmenou@cfa.harvard.edu NR 61 TC 55 Z9 55 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 1 PY 2000 VL 531 IS 1 BP 42 EP 51 DI 10.1086/308468 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 297WM UT WOS:000086105700005 ER PT J AU Blanton, EL Gregg, MD Helfand, DJ Becker, RH White, RL AF Blanton, EL Gregg, MD Helfand, DJ Becker, RH White, RL TI First bent-double radio sources: Tracers of high-redshift clusters SO ASTROPHYSICAL JOURNAL LA English DT Article DE galaxies : clusters : general; radio continuum : galaxies ID MEDIUM-SENSITIVITY SURVEY; DISTANT GALAXY CLUSTERS; X-RAY DATA; ABELL CLUSTERS; RICH CLUSTERS; FIELD GALAXIES; NUMBER COUNTS; VLA SURVEY; LUMINOSITY; EVOLUTION AB Bent-double radio sources can act as tracers for clusters of galaxies. We present imaging and spectroscopic observations of the environments surrounding 10 of these sources (most of them wide-angle tails [WATs]) selected from the VLA FIRST survey. Our results reveal a previously unknown duster associated with eight of the radio sources with redshifts in the range 0.33 < z < 0.85; furthermore, we cannot rule out that the other two bent doubles may be associated with clusters at higher redshift. Richness measurements indicate that these clusters are typical of the majority of those found in the Abell catalog with a range of Abell richness classes from 0 to 2. The line-of-sight velocity dispersions are very different from cluster to cluster, ranging from approximately 300 to 1100 km s(-1). At the upper end of these intervals, we may be sampling some of the highest redshift massive clusters known. Alternatively, the large velocity dispersions measured in some of the clusters may indicate that they are merging systems with significant substructure, consistent with recent ideas concerning WAT formation (Burns et al.). C1 Columbia Univ, Dept Astron, New York, NY 10027 USA. Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. Space Telescope Sci Inst, Baltimore, MD 21218 USA. RP Blanton, EL (reprint author), Columbia Univ, Dept Astron, New York, NY 10027 USA. RI White, Richard/A-8143-2012; Blanton, Elizabeth/H-4501-2014 NR 61 TC 24 Z9 24 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 1 PY 2000 VL 531 IS 1 BP 118 EP 136 DI 10.1086/308428 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 297WM UT WOS:000086105700009 ER PT J AU Tsvetanov, ZI Golimowski, DA Zheng, W Geballe, TR Leggett, SK Ford, HC Davidsen, AF Uomoto, A Fan, XH Knapp, GR Strauss, MA Brinkmann, J Lamb, DQ Newberg, HJ Rechenmacher, R Schneider, DP York, DG Lupton, RH Pier, JR Annis, J Csabai, I Hindsley, RB Ivesic, Z Munn, JA Thakar, AR Waddell, P AF Tsvetanov, ZI Golimowski, DA Zheng, W Geballe, TR Leggett, SK Ford, HC Davidsen, AF Uomoto, A Fan, XH Knapp, GR Strauss, MA Brinkmann, J Lamb, DQ Newberg, HJ Rechenmacher, R Schneider, DP York, DG Lupton, RH Pier, JR Annis, J Csabai, I Hindsley, RB Ivesic, Z Munn, JA Thakar, AR Waddell, P TI The discovery of a second field methane brown dwarf from Sloan Digital Sky Survey commissioning data SO ASTROPHYSICAL JOURNAL LA English DT Article DE stars : low-mass, brown dwarfs; surveys ID GLIESE 229B; STARS; ATMOSPHERE; SPECTRA; LITHIUM; MASS AB We report the discovery of a second field methane brown dwarf from the commissioning data of the Sloan Digital Sky Survey (SDSS). The object, SDSS J134646.45-003150.4 (hereafter SDSS 1346-00), was selected because of its very red color and stellar appearance. Its spectrum between 0.8 and 2.5 mu m is dominated by strong absorption bands of H2O and CH4 and closely mimics those of Gliese 229B and SDSS 162414.37+002915.6 (hereafter SDSS 1624+00), two other known methane brown dwarfs. SDSS 1346-00 is approximately 1.5 mag fainter than Gliese 229B, suggesting that it lies about 11 pc from the Sun. The ratio of flux at 2.1 mu m to that at 1.27 mu m is larger for SDSS 1346-00 than for Gliese 229B and SDSS 1624+00, which suggests that SDSS 1346-00 has a slightly higher effective temperature than the others. Based on a search area of 130 deg(2) and a detection limit of z* = 19.8, we estimate a space, density of 0.05 pc(-3) for methane brown dwarfs with T-eff similar to 1000 K in the 40 pc(3) volume of our search. This estimate is based on small-sample statistics and should be treated with appropriate caution. C1 Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. Gemini N Observ, Hilo, HI 96720 USA. UKIRT, Joint Astron Ctr, Hilo, HI 96720 USA. Princeton Univ Observ, Princeton, NJ 08544 USA. Apache Point Observ, Sunspot, NM 88349 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA. USN Observ, Flagstaff, AZ 86002 USA. Eotvos Lorand Univ, Dept Phys Comlex Syst, H-1117 Budapest, Hungary. USN Observ, Washington, DC 20392 USA. Univ Washington, Dept Astron, Seattle, WA 98195 USA. RP Johns Hopkins Univ, Dept Phys & Astron, 3701 San Martin Dr, Baltimore, MD 21218 USA. RI Csabai, Istvan/F-2455-2012 NR 33 TC 79 Z9 79 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD MAR 1 PY 2000 VL 531 IS 1 BP L61 EP L65 DI 10.1086/312515 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 297WP UT WOS:000086105900016 ER PT J AU Fournier, KB Cohen, M May, MJ Goldstein, WH AF Fournier, KB Cohen, M May, MJ Goldstein, WH TI Ionization state distribution and radiative cooling rate for argon in a low-density plasma (vol 70, pg 245, 1998) SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Correction C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Fournier, KB (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD MAR PY 2000 VL 74 IS 2 BP 333 EP 334 PG 2 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA 302AB UT WOS:000086341800005 ER PT J AU Xu, D Unseren, MA Xu, Y Uberbacher, EC AF Xu, D Unseren, MA Xu, Y Uberbacher, EC TI Sequence-structure specificity of a knowledge based energy function at the secondary structure level SO BIOINFORMATICS LA English DT Article ID PROTEIN-SEQUENCE; FOLD RECOGNITION; POTENTIALS AB Motivation: This paper investigates the sequence-structure specificity of a representative knowledge based energy function by applying if to threading at the level of secondary structures of proteins. Assessing the strengths and weaknesses of an energy function at this fundamental level provides more detailed and insightful information than at the tertiary structure level and the results obtained can be useful in tertiary level threading. Results: We threaded each of the 293 non-redundant proteins onto the secondary structures contained in its respective native protein (host template). We also used 68 pairs of proteins with similar folds and low sequence identity For each pair we threaded the sequence of one protein onto the secondary structures of the other protein. The discerning power of the total energy function and its one-body, pairwise, and mutation components is studied. We then Applied our energy function to a recent study which demonstrated how a designed 11-amino acid sequence can replace distinct segments (one segment is an a-helix, the other is a beta-sheet) of a protein without changing its fold. We conducted random mutations of the designed sequence to determine the patterns for favorable mutations. We also studied the sequence-structure specificity at the boundaries of a secondary structure. Finally, we demonstrated how to speed up tertiary level threading by filtering out alignments found to be energetically unfavorable during the secondary structure threading. C1 Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. RP Xu, D (reprint author), Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, POB 2008, Oak Ridge, TN 37831 USA. NR 23 TC 4 Z9 7 U1 0 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 1367-4803 J9 BIOINFORMATICS JI Bioinformatics PD MAR PY 2000 VL 16 IS 3 BP 257 EP 268 DI 10.1093/bioinformatics/16.3.257 PG 12 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 324PF UT WOS:000087630000009 PM 10869019 ER PT J AU Zoldi, SM Krystal, A Greenside, HS AF Zoldi, SM Krystal, A Greenside, HS TI Stationarity and redundancy of multichannel EEG data recorded during generalized tonic-clonic seizures SO BRAIN TOPOGRAPHY LA English DT Article DE ECT; generalized seizures; stationarity; redundancy ID NONSTATIONARY TIME-SERIES; ELECTROCONVULSIVE-THERAPY; STIMULUS-INTENSITY; ELECTRODE PLACEMENT; BILATERAL ECT; INFORMATION; DURATION; EFFICACY AB To improve our understanding of the physiology of generalized tonic-clonic (GTC) seizures, we have investigated the stationarity and redundancy of 21-electrode EEG data recorded from ten patients during GTC seizures elicited by electroconvulsive therapy (ECT). Stationarity was ex amined by calculating probability density functions (pdfs) and power spectra over small equal-length non-overlapping time windows and then by studying, visually and quantitatively, the evolution of these quantities over the duration of the seizures. Our analysis shows that some seizures had no demonstrable stationarity, that most seizures had time intervals of at least a few seconds that were statistically stationary by several criteria, and that, in some seizures, there were leads which were delayed in manifesting the statistical changes associated with seizure onset evident in other leads. The redundancy analysis demonstrated for the first time posterior-to-anterior time delays in the mid-ictal region of GTC seizures. The implications of these findings are discussed for the analysis of GTC seizure EEG data, for the physiology of GTC seizures, and for ECT research. C1 Duke Univ, Med Ctr, Dept Psychiat, Durham, NC 27710 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. Duke Univ, Dept Phys, Durham, NC 27706 USA. RP Krystal, A (reprint author), Duke Univ, Med Ctr, Dept Psychiat, Durham, NC 27710 USA. RI Krystal, Andrew/J-7109-2013 OI Krystal, Andrew/0000-0002-6702-781X FU NIMH NIH HHS [K20MH01151, R29MH57532] NR 52 TC 10 Z9 10 U1 0 U2 1 PU KLUWER ACADEMIC-HUMAN SCIENCES PRESS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 USA SN 0896-0267 J9 BRAIN TOPOGR JI Brain Topogr. PD SPR PY 2000 VL 12 IS 3 BP 187 EP 200 DI 10.1023/A:1023489807177 PG 14 WC Clinical Neurology; Neurosciences SC Neurosciences & Neurology GA 307WL UT WOS:000086677100003 PM 10791682 ER PT J AU Riches, MR Wang, WC Chen, PQ Tao, SY Zhou, SG Ding, YH AF Riches, MR Wang, WC Chen, PQ Tao, SY Zhou, SG Ding, YH TI Recent progress in the joint agreements on "global and regional climate change" studies between the United States and the People's Republic of China SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID METHANE EMISSIONS; RICE FIELDS AB This report summarizes the progress since 1991 of two agreements on "global and regional climate change" studies between the U.S. Department of Energy (DOE) and two state agencies of the People's Republic of China. The first agreement is the DOE-Chinese Academy of Science joint project on the "Study of the Greenhouse Effect" and the second agreement is the DOE-China Meteorological Administration joint project on the "Study of Regional Climate." While development of general circulation climate models and analysis of climate data over China continues, the joint research produced several unique Chinese climate datasets, including the reconstruction of 2000 years of historical climate, quality assured instrumental climate data, and an archive of methane emissions from rice fields in southern China. C1 SUNY Albany, Atmospher Sci Res Ctr, Albany, NY 12203 USA. US Dept Energy, Off Biol & Environm Res, Germantown, MD USA. Chinese Acad Sci, Bur Sci & Technol Resources & Environm, Beijing, Peoples R China. Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China. China Meteorol Adm, Dept Meteorol Sci, Beijing, Peoples R China. China Met Adm, Natl Climate Ctr, Beijing, Peoples R China. RP Wang, WC (reprint author), SUNY Albany, Atmospher Sci Res Ctr, 251 Fuller Rd, Albany, NY 12203 USA. NR 21 TC 13 Z9 14 U1 0 U2 8 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD MAR PY 2000 VL 81 IS 3 BP 491 EP 499 DI 10.1175/1520-0477(2000)081<0491:RPITJA>2.3.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 305EB UT WOS:000086525500008 ER PT J AU Hill, WR Bednarek, AT Larsen, IL AF Hill, WR Bednarek, AT Larsen, IL TI Cadmium sorption and toxicity in autotrophic biofilms SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID HEAVY-METALS; PERIPHYTON; PHOTOSYNTHESIS; PHOSPHORUS; ALGAE; BIOACCUMULATION; COMMUNITIES; REMOVAL; STREAMS; GROWTH AB Autotrophic biofilms (periphyton) accumulate substantial quantities of metals from contaminated water. In this study, we measured the time course of biofilm cadmium sorption, examined the effects of current, biomass, and light on short-term cadmium sorption by biofilms, and tested the toxicity of cadmium to biofilm photosynthesis. The time course of cadmium sorption appeared to be a linear function of time over the 48-h measurement period. Biofilms in current greater than or equal to 2 cm.s(-1) sorbed three to five times more cadmium than biofilms in still water. Cadmium sorbed after 4 h was 75% greater in high-biomass biofilm (2.5 mg dry mass.cm(-2)) than in low-biomass biofilm (0.5 mg dry mass.cm(-2)), but only in moving water. Light enhanced the sorption of cadmium 40% in one biofilm type. Cadmium toxicity to photo synthesis was evident after 24 h in thin biofilms exposed to initial cadmium concentrations greater than or equal to 10 mu g.L-1; photosynthesis by thicker biofilms was not significantly impaired even at the highest concentration (100 mu g.L-1). Variations in current, biofilm biomass, and light are likely to influence the movement of metals in flowing systems. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. RP Hill, WR (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. NR 42 TC 41 Z9 42 U1 2 U2 7 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD MAR PY 2000 VL 57 IS 3 BP 530 EP 537 DI 10.1139/cjfas-57-3-530 PG 8 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA 296VA UT WOS:000086046400003 ER PT J AU Kitts, CL Green, CE Otley, RA Alvarez, MA Unkefer, PJ AF Kitts, CL Green, CE Otley, RA Alvarez, MA Unkefer, PJ TI Type I nitroreductases in soil enterobacteria reduce TNT (2,4,6-trinitrotoluene) and RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) SO CANADIAN JOURNAL OF MICROBIOLOGY LA English DT Article DE nitroreductase; TNT; RDX; Enterobacter cloacae; Morganella morganii ID ESCHERICHIA-COLI; NITROAROMATIC COMPOUNDS; BIODEGRADATION; PURIFICATION; METABOLISM; EXPRESSION; CLOACAE AB Many enteric bacteria express a type I oxygen-insensitive nitroreductase, which reduces nitro groups on many different nitroaromatic compounds under aerobic conditions. Enzymatic reduction of nitramines was also documented in enteric bacteria under anaerobic conditions. This study indicates that nitramine reduction in enteric bacteria is carried out by the type I, or oxygen-insensitive nitroreductase, rather than a type II enzyme. The enteric bacterium Morganella morganii strain B2 with documented hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) nitroreductase activity, and Enterobacter cloacae strain 96-3 with documented 2,4,6-trinitrotoluene (TNT) nitroreductase activity, were used here to show that the explosives TNT and RDX were both reduced by a type I nitroreductase. Morganella morganii and E. cloacae exhibited RDX and TNT nitroreductase activities in whole cell assays. Type I nitroreductase, purified from E. cloacae, oxidized NADPH with TNT or RDX as substrate. When expression of the E. cloacae type I nitroreductase gene was induced in an Escherichia coli strain carrying a plasmid, a simultaneous increase in TNT and RDX nitroreductase activities was observed. In addition, neither TNT nor RDX nitroreductase activity was detected in nitrofurazone-resistant mutants of M. morganii. We conclude that a type I nitroreductase present in these two enteric bacteria was responsible for the nitroreduction of both types of explosive. C1 Calif Polytech State Univ San Luis Obispo, Environm Biotechnol Inst, San Luis Obispo, CA 93407 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. RP Kitts, CL (reprint author), Calif Polytech State Univ San Luis Obispo, Environm Biotechnol Inst, San Luis Obispo, CA 93407 USA. NR 28 TC 82 Z9 84 U1 0 U2 13 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA SN 0008-4166 J9 CAN J MICROBIOL JI Can. J. Microbiol. PD MAR PY 2000 VL 46 IS 3 BP 278 EP 282 DI 10.1139/cjm-46-3-278 PG 5 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology GA 288PJ UT WOS:000085571900010 PM 10749541 ER PT J AU Barcellos-Hoff, MH Ravani, SA AF Barcellos-Hoff, MH Ravani, SA TI Irradiated mammary gland stroma promotes the expression of tumorigenic potential by unirradiated epithelial cells SO CANCER RESEARCH LA English DT Article ID GROWTH-FACTOR-BETA; BREAST-CANCER; EXTRACELLULAR-MATRIX; TRANSGENIC MICE; TGF-BETA; FUNCTIONAL-DIFFERENTIATION; TUBERCULOSIS PATIENTS; INITIATION FREQUENCY; NEOPLASTIC DISEASE; GAMMA-IRRADIATION AB We have shown that ionizing radiation, a known carcinogen of human breast, elicits rapid, persistent, and global changes in the mammary microenvironment as evidenced by altered extracellular matrix composition and growth factor activities. To address whether these events contribute to radiogenic carcinogenesis, we evaluated the effect of irradiated mammary stroma on the neoplastic potential of COMMA-D mammary epithelial cells. Although COMMA-D cells harbor mutations in both alleles of p53, they are nontumorigenic when injected s.c. into syngeneic hosts. Unirradiated COMMA-D cells transplanted to mammary fat pads cleared previously of epithelia preferentially formed tumors in irradiated hosts. Tumor incidence at 6 weeks was 81% +/- 12 SE when animals were irradiated with 4 Gy, 3 days prior to transplantation, compared with 19% +/- 2 SE (P < 0.005) in sham-irradiated hosts. This effect was evident when cells were transplanted 1 to 14 days after irradiation. Furthermore, tumors were significantly larger (243.1 +/- 61.3 mm(3) versus 30.8 +/- 8.7 mm(3)) and arose more quickly (100% by 6 weeks versus 39% over 10 weeks in sham hosts) in fat pads in irradiated hosts. The contribution of local versus systemic effects was evaluated using hemibody (left versus right) irradiation; tumors formed only in fat pads on the irradiated side. These data indicate that radiation-induced changes in the stromal microenvironment can contribute to neoplastic progression in vivo. Disruption of solid tissue interactions is a heretofore unrecognized activity of ionizing radiation as a carcinogen. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Barcellos-Hoff, MH (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. FU NCI NIH HHS [CA-5184] NR 62 TC 387 Z9 396 U1 1 U2 12 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAR 1 PY 2000 VL 60 IS 5 BP 1254 EP 1260 PG 7 WC Oncology SC Oncology GA 293RA UT WOS:000085865700022 PM 10728684 ER PT J AU Iyer, R Lehnert, BE AF Iyer, R Lehnert, BE TI Factors underlying the cell growth-related bystander responses to alpha particles SO CANCER RESEARCH LA English DT Article ID SISTER-CHROMATID EXCHANGES; HUMAN LUNG FIBROBLASTS; DNA STRAND BREAKAGE; HYDROGEN-PEROXIDE; TRANSFORMING GROWTH-FACTOR-BETA-1; FACTOR-BETA; CHROMOSOMAL INSTABILITY; EPITHELIAL-CELLS; NUCLEAR ANTIGEN; P53-DEPENDENT MANNER AB Increases in cell proliferation are widely viewed as being of importance in carcinogenesis. We report that exposure of normal human lung fibroblasts to a low dose of alpha particles like those emitted by radon/radon progeny stimulates their proliferation in vitro, and this response also occurs when unirradiated cells are treated with supernatants from alpha-irradiated cells. We attribute the promitogenic response to superoxide dismutase- and catalase-inhibitable alpha particle-induced increases in the concentrations of transforming growth factor beta 1 (TGF-beta 1) in cell supernatants, TGF-beta 1 at concentrations commensurate with those in the supernatants capably induces increases in intracellular reactive oxygen species (ROS) in unirradiated cells. Furthermore, the addition of supernatants from alpha-irradiated cells to unirradiated cells decreases cellular levels of TP53 and CDKN1A and increases CDC2 and proliferating cell nuclear antigen in the latter. Like the increased intracellular ROS bystander effect, this "decreased TP53/CDKNIA response" ran be mimicked in otherwise untreated cells by the addition of low concentrations of TGF-beta 1, Our results indicate that alpha particle-associated increases in cell growth correlate with intracellular increases in ROS along with decreases in TP53 and CDKN1A, and that these cellular responses are mechanistically coupled. As well, the proliferating cell nuclear antigen and CDC2 increases that occur along with the decreased TP53/CDKN1A bystander effect also would expectedly favor enhanced cell growth. Such processes may account for cell hyperplastic responses in the conducting airways of the lower respiratory track that occur after inhalation exposure to radon/radon progeny, as well as, perhaps, other ROS-associated environmental stresses. C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Cell & Mol Biol Grp, Los Alamos, NM 87545 USA. RP Lehnert, BE (reprint author), Univ Calif Los Alamos Natl Lab, Biosci Div, Cell & Mol Biol Grp, MS M888, Los Alamos, NM 87545 USA. FU NCI NIH HHS [CA82598]; NCRR NIH HHS [P41-RR01315] NR 91 TC 261 Z9 279 U1 2 U2 12 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAR 1 PY 2000 VL 60 IS 5 BP 1290 EP 1298 PG 9 WC Oncology SC Oncology GA 293RA UT WOS:000085865700027 PM 10728689 ER PT J AU Lin, CQ Singh, J Murata, K Itahana, Y Parrinello, S Liang, SH Gillett, CE Campisi, J Desprez, PY AF Lin, CQ Singh, J Murata, K Itahana, Y Parrinello, S Liang, SH Gillett, CE Campisi, J Desprez, PY TI A role for Id-1 in the aggressive phenotype and steroid hormone response of human breast cancer cells SO CANCER RESEARCH LA English DT Article ID LOOP-HELIX PROTEIN; GROWTH-FACTOR; ID1 GENE; CELLULAR PROLIFERATION; TUMOR-CELLS; DIFFERENTIATION; EXPRESSION; TRANSCRIPTION; INHIBITION; PROGESTINS AB The helix-loop-helix protein Id-1 inhibits the activity of basic helix-loop-helix transcription factors, and is an important regulator of cell growth and tissue-specific differentiation. We have shown (P, Y, Desprez et at, Mel. Cell. Biol,, 18: 4577-4588, 1998) that ectopic expression of Id-1 inhibits differentiation and stimulates the proliferation and invasiveness of mouse mammary epithelial cells, and that there is a correlation between the levels of Id-1 protein and the aggressiveness of several human breast cancer cell lines. Here, we show that aggressive and metastatic breast cancer cells express high levels of Id-1 mRNA because of a loss of serum-dependent regulation that is mediated by a 2.2-kb region of the human Id-1 promoter. Three lines of evidence suggest that unregulated Id-1 expression may be an important regulator of the aggressive phenotype of a subset of human breast cancer cells: (a) a constitutively expressed Id-1 cDNA, when introduced into a nonaggressive breast cancer cell line (T47D), conferred a more aggressive phenotype, as measured by growth and invasiveness; (b) Id-1 was an important mediator of the effects of sex steroid hormones on T47D cell proliferation. Estrogen stimulated proliferation and induced Id-1 expression, whereas progesterone inhibited proliferation and repressed Id-1 expression. Progesterone repressed Id-1 expression, at least in part by repressing transcription. Most importantly, an antisense oligonucleotide that reduced Id-1 protein levels reduced the ability of estrogen to stimulate cell proliferation, whereas constitutive Id-1 expression rendered cells refractory to growth inhibition by progesterone; and (c) using a limited number of breast cancer biopsies, we showed that Id-1, was more frequently expressed in infiltrating carcinomas compared with ductal carcinomas in situ, Our results suggest that Id-1 can control the malignant progression of breast cancer cells, particularly that mediated by sex steroid hormones. Moreover, Id-1 has the potential to serve as a marker for aggressive breast tumors. C1 Calif Pacific Med Ctr, Geraldine Brush Canc Res Inst, San Francisco, CA 94115 USA. Guys Hosp, Imperial Canc Res Fund, Breast Pathol Lab, London SE1 9RT, England. Lawrence Berkeley Lab, Dept Cell & Mol Biol, Berkeley, CA 94720 USA. RP Desprez, PY (reprint author), Calif Pacific Med Ctr, Geraldine Brush Canc Res Inst, Stern Bldg,2330 Clay St, San Francisco, CA 94115 USA. FU NCI NIH HHS [R01 CA82548] NR 49 TC 206 Z9 218 U1 1 U2 6 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAR 1 PY 2000 VL 60 IS 5 BP 1332 EP 1340 PG 9 WC Oncology SC Oncology GA 293RA UT WOS:000085865700033 PM 10728695 ER PT J AU Gardner, SN AF Gardner, SN TI A mechanistic, predictive model of dose-response curves for cell cycle phase-specific and -nonspecific drugs SO CANCER RESEARCH LA English DT Article ID CONTINUOUS-INFUSION; LUNG-CANCER; COLORECTAL-CANCER; RANDOMIZED TRIAL; RESISTANCE; ETOPOSIDE; INVITRO; FLUOROURACIL; EFFICACY; SCHEDULE AB In vitro dose-response curves for anticancer agents are useful for predicting the clinical response to chemotherapy, and models to capture the time-dependency of dose-response curves are necessary for potential clinical extrapolation, Usually, the modified Hill model is used (see Levasseur et al., Canter Res., 58: 5749-5761, 1998), although this model is neither mechanistic nor predictive for understanding how drug and tumor cell characteristics affect the shape of the dose-response curve. A new exponential kill (EK) model is proposed to predict the shape of dose-response curves based on the cell cycle phase specificity of a drug, the cell cycle time, the duration and concentration of drug exposure at the site of action, and a scaling factor for the level of drug resistance. Explicit analytical equations are presented for predicting the ICx (the concentration required to reduce cell growth by x%), the maximum cell kill achievable at high doses after a given duration of drug exposure, and the slope of the survival fraction versus log (concentration) plot at the ICx. Numerical solutions illustrate that there may be an optimal, finite duration of drug exposure that maximizes cell kill for a given area under the concentration versus time curve, and an analytical equation is given to calculate when such an optimal, finite duration exists. The EK model generates sigmoidal dose-response curves, like those seen empirically and previously described by the Hill model, which eventually plateau with increasing drug concentration at levels that depend on the cell cycle specificity of the drug, the cell cycle time, and the duration of exposure to the drug. This study includes no original data. Instead, empirical results in the literature are used to test the model. Because data by Levasseur et at (1998) was fit to the Hill model assuming the plateau in the effect versus concentration curve to be independent of exposure duration, a full test of the model is not possible using their published data. Some tests of the EK model were possible, however, showing that EK model predictions yield good fits to in vitro data published in that and in another study. In addition, combining the EK model with a pharmacokinetic model resulted in predictions that were consistent with results of clinical studies comparing etoposide given in different schedules, Further tests of the model are necessary. C1 Univ London Imperial Coll Sci Technol & Med, NERC, Ctr Populat Biol, Ascot SL5 7PY, Berks, England. RP Gardner, SN (reprint author), Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, POB 808,7000 E Ave,L-452, Livermore, CA 94551 USA. NR 32 TC 60 Z9 63 U1 0 U2 8 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAR 1 PY 2000 VL 60 IS 5 BP 1417 EP 1425 PG 9 WC Oncology SC Oncology GA 293RA UT WOS:000085865700046 PM 10728708 ER PT J AU Stevens, FJ Kisilevsky, R AF Stevens, FJ Kisilevsky, R TI Immunoglobulin light chains, glycosaminoglycans, and amyloid SO CELLULAR AND MOLECULAR LIFE SCIENCES LA English DT Review DE glycosaminoglycans; immunoglobulin light chains; amyloidosis; amyloid AL; heparan sulfate; heparin ID HEPARAN-SULFATE PROTEOGLYCANS; BASEMENT-MEMBRANE COMPONENTS; HIGH-AFFINITY BINDING; BENCE-JONES PROTEINS; ALZHEIMERS-DISEASE; APOLIPOPROTEIN-E; FIBRIL FORMATION; EXTRACELLULAR-MATRIX; STRUCTURAL-ANALYSIS; AA AMYLOIDOGENESIS AB Immunoglobulin light chains are the precursor proteins for fibrils that are formed during primary amyloidosis and in amyloidosis associated with multiple myeloma. As found for the approximately 20 currently described forms of focal, localized, or systemic amyloidoses, light chain-related fibrils extracted from physiological deposits are invariably associated with glycosaminoglycans, predominantly heparan sulfate. Other amyloid-related proteins are either structurally normal, such as beta 2-microglobulin and islet amyloid polypeptide, fragments of normal proteins such as serum amyloid A protein or the precursor protein of the beta peptide involved in Alzheimer's disease, or are inherited forms of single amino acid variants of a normal protein such as found in the familial forms of amyloid associated with transthyretin. In contrast, the primary structures of light chains involved in fibril formation exhibit extensive mutational diversity rendering some proteins highly amyloidogenic and others non-pathological. The interactions between light chains and glycosaminoglycans are also affected by amino acid variation and may influence the clinical course of disease by enhancing fibril stability and contributing to resistance to protease degradation. Relatively little is currently known about the mechanisms by which glycosaminoglycans interact with light chains and light-chain fibrils. It is probable that future studies of this uniquely diverse family of proteins will continue to shed light on the processes of amyloidosis, and contribute as well to a greater understanding of the normal physiological roles of glycosaminoglycans. C1 Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA. Queens Univ, Dept Pathol, Kingston, ON K7L 3N6, Canada. RP Stevens, FJ (reprint author), Argonne Natl Lab, Biosci Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM stevens@anlcmb.bim.anl.gov FU NIDDK NIH HHS [DK43757] NR 68 TC 37 Z9 40 U1 1 U2 4 PU SPRINGER BASEL AG PI BASEL PA PICASSOPLATZ 4, BASEL, 4052, SWITZERLAND SN 1420-682X J9 CELL MOL LIFE SCI JI Cell. Mol. Life Sci. PD MAR PY 2000 VL 57 IS 3 BP 441 EP 449 DI 10.1007/PL00000706 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 308JZ UT WOS:000086708800010 PM 10823245 ER PT J AU Volkow, ND Fowler, JS AF Volkow, ND Fowler, JS TI Addiction, a disease of compulsion and drive: Involvement of the orbitofrontal cortex SO CEREBRAL CORTEX LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; MEDIODORSAL THALAMIC NUCLEUS; CONDITIONED PLACE PREFERENCE; MEDIAL PREFRONTAL CORTEX; PRIMATE BASAL GANGLIA; HUMAN-BRAIN; COCAINE ADDICTION; C-11 RACLOPRIDE; STRIATOPALLIDAL SYSTEM; NEURONAL-ACTIVITY AB Understanding the changes in the brain which occur in the transition from normal to addictive behavior has major implications in public health. Here we postulate that while reward circuits (nucleus accumbens, amygdala), which have been central to theories of drug addiction, may be crucial to initiate drug self-administration, the addictive state also involves disruption of circuits involved with compulsive behaviors and with drive. We postulate that intermittent dopaminergic activation of reward circuits secondary to drug self-administration leads to dysfunction of the orbitofrontal cortex via the striato-thalamo-orbitofrontal circuit. This is supported by imaging studies showing that in drug abusers studied during protracted withdrawal, the orbitofrontal cortex is hypoactive in proportion to the levels of dopamine D2 receptors in the striatum. In contrast, when drug abusers are tested shortly after last cocaine use or during drug-induced craving, the orbitofrontal cortex is hypermetabolic in proportion to the intensity of the craving. Because the orbitofrontal cortex is involved with drive and with compulsive repetitive behaviors, its abnormal activation in the addicted subject could explain why compulsive drug self-administration occurs even with tolerance to the pleasurable drug effects and in the presence of adverse reactions. This model implies that pleasure per se is not enough to maintain compulsive drug administration in the drug-addicted subject and that drugs that could interfere with the activation of the striato-thalamo-orbitofrontal circuit could be beneficial in the treatment of drug addiction. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. SUNY Stony Brook, Dept Psychiat, Stony Brook, NY 11794 USA. RP Volkow, ND (reprint author), Brookhaven Natl Lab, Dept Med, Bldg 490, Upton, NY 11973 USA. FU NIAAA NIH HHS [AA09481]; NIDA NIH HHS [DA06891] NR 86 TC 591 Z9 610 U1 9 U2 59 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 USA SN 1047-3211 J9 CEREB CORTEX JI Cereb. Cortex PD MAR PY 2000 VL 10 IS 3 BP 318 EP 325 DI 10.1093/cercor/10.3.318 PG 8 WC Neurosciences SC Neurosciences & Neurology GA 293QZ UT WOS:000085865600011 PM 10731226 ER PT J AU del-Castillo-Negrete, D AF del-Castillo-Negrete, D TI Self-consistent chaotic transport in fluids and plasmas SO CHAOS LA English DT Article; Proceedings Paper CT Workshop on Nonlinear Dynamics - Chaos, Transport, and Transition to Turbulence CY NOV, 1998 CL NEW YORK, NEW YORK SP Courant Inst ID MARGINALLY STABLE PLASMAS; PRESERVING NONTWIST MAPS; SHEAR-FLOW; ANOMALOUS DIFFUSION; VORTICITY DEFECTS; LAGRANGIAN CHAOS; ROSSBY WAVES; LEVY FLIGHTS; DYNAMICS; PERTURBATIONS AB Self-consistent chaotic transport is the transport of a field F by a velocity field v according to an advection-diffusion equation in which there is a dynamical constrain between the two fields, i.e., O(F,v)=0 where O is an integral or differential operator, and the Lagrangian trajectories of fluid particles exhibit sensitive dependence on initial conditions. In this paper we study self-consistent chaotic transport in two-dimensional incompressible shear flows. In this problem F is the vorticity zeta, the corresponding advection-diffusion equation is the vorticity equation, and the self-consistent constrain is the vorticity-velocity coupling (z) over cap.del xv=zeta. To study this problem we consider three self-consistent models of intermediate complexity between the simple but limited kinematic chaotic advection models and the approach based on the direct numerical simulation of the Navier-Stokes equation. The first two models, the vorticity defect model and the single wave model, are constructed by successive simplifications of the vorticity-velocity coupling. The third model is an area preserving self-consistent map obtained from a space-time discretization of the single wave model. From the dynamical systems perspective these models are useful because they provide relatively simple self-consistent Hamiltonians (streamfunctions) for the Lagrangian advection problem. Numerical simulations show that the models capture the basic phenomenology of shear flow instability, vortex formation and relaxation typically observed in direct numerical simulations of the Navier-Stokes equation. Self-consistent chaotic transport in electron plasmas in the context of kinetic theory is also discussed. In this case F is the electron distribution function in phase space, the corresponding advection equation is the Vlasov equation and the self-consistent constrain is the Poisson equation. This problem is closely related to the vorticity problem. In particular, the vorticity defect model is analogous to the Vlasov-Poisson model and the single wave model and the self-consistent map apply equally to both plasmas and fluids. Also, the single wave model is analogous to models used in the study of globally coupled oscillator systems. (C) 2000 American Institute of Physics. [S1054-1500(00)01501-9]. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP del-Castillo-Negrete, D (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, T-15 MS-K717, Los Alamos, NM 87545 USA. OI del-Castillo-Negrete, Diego/0000-0001-7183-801X NR 53 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 1054-1500 J9 CHAOS JI Chaos PD MAR PY 2000 VL 10 IS 1 BP 75 EP 88 DI 10.1063/1.166477 PG 14 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA 288KZ UT WOS:000085563100007 ER PT J AU Hoffman, DK Gunaratne, GH Zhang, DS Kouri, DJ AF Hoffman, DK Gunaratne, GH Zhang, DS Kouri, DJ TI A method to Fourier filter textured images SO CHAOS LA English DT Article ID GIBBS RANDOM-FIELDS; ANISOTROPIC DIFFUSION; PATTERNS; INSTABILITY; EQUATION; MODELS AB An algorithm is introduced to extract an underlying image from a class of textures. It is assumed that the image is bandwidth limited and the noise is broad-band. The initial step of the algorithm extends the signal to a larger periodic image using "Distributed Approximating Functionals." The second step introduces a low-pass filter which allows the identification and elimination of the high-frequency components of the noise. The periodicity of the resulting image allows it to be Fourier filtered without aliasing. The feasibility of the algorithm is demonstrated on several noisy patterns generated in experiments and model systems. (C) 2000 American Institute of Physics. [S1054-1500(00)00101-4]. C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Univ Houston, Dept Phys, Houston, TX 77204 USA. Inst Fundamental Studies, Kandy, Sri Lanka. Univ Houston, Dept Phys, Houston, TX 77204 USA. Univ Houston, Dept Chem, Houston, TX 77204 USA. RP Iowa State Univ, Dept Chem, Ames, IA 50011 USA. EM gemunu@uh.edu; hoffman@qdynamic.ameslab.gov; kouri@uh.edu NR 37 TC 9 Z9 9 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1054-1500 EI 1089-7682 J9 CHAOS JI Chaos PD MAR PY 2000 VL 10 IS 1 BP 240 EP 247 DI 10.1063/1.166490 PG 8 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA 288KZ UT WOS:000085563100022 ER PT J AU Quinones, I Ford, JC Guiochon, G AF Quinones, I Ford, JC Guiochon, G TI Multisolute adsorption equilibria in a reversed-phase liquid chromatography system SO CHEMICAL ENGINEERING SCIENCE LA English DT Article DE adsorption; adsorbed solution model; isoteric heats; liquid chromatography; liquid-liquid equilibria; liquid-solid equilibria; reversed phase liquid chromatography ID COMPETITIVE ADSORPTION; SINGLE-COMPONENT; ISOTHERM MODELS; RETENTION; EXTENSION; MIXTURES; SILICA; SOLIDS; HPLC AB Multisolute adsorption equilibrium data are reported for benzyl alcohol, 2-phenylethanol and 2-methyl benzyl alcohol in a reversed-phase system. The adsorption data acquired exhibit very good thermodynamic consistency. The thermodynamic functions of adsorption were derived from the single-solute adsorption data measured at different temperatures. The values of the isosteric heats of adsorption suggest a nearly homogeneous surface for the adsorbent (octadecyl bonded silica) under consideration. A nonideal adsorbed solution theory model is applied to the experimental data. The model provides an excellent prediction of the multisolute adsorption equilibria based on the parameters derived from the single-solute adsorption data. Liquid-liquid equilibrium models were also used to describe the experimental data. In this case, the best representation of the experimental data is obtained when using 1-decanol to represent the stationary phase. Although the partition model provides a satisfactory representation of the experimental data at low concentrations, it fails to represent the curvature of the equilibrium data at higher concentrations of the solutes. The latter model is also unable to describe the temperature dependence exhibited by the single-solute adsorption data. (C) 1999 Elsevier Science Ltd. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Indiana Univ Penn, Dept Chem, Indiana, PA 15705 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, 611 Buehler Hall, Knoxville, TN 37996 USA. EM guiochon@utk.edu NR 40 TC 44 Z9 44 U1 2 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0009-2509 J9 CHEM ENG SCI JI Chem. Eng. Sci. PD MAR PY 2000 VL 55 IS 5 BP 909 EP 929 DI 10.1016/S0009-2509(99)00393-0 PG 21 WC Engineering, Chemical SC Engineering GA 257RP UT WOS:000083795800003 ER PT J AU Ying, TY Yiacoumi, S Tsouris, C AF Ying, TY Yiacoumi, S Tsouris, C TI High-gradient magnetically seeded filtration SO CHEMICAL ENGINEERING SCIENCE LA English DT Article DE high-gradient magnetic separation; magnetic seeding; magnetic filtration ID PARAMAGNETIC PARTICLES; FLOCCULATION; SEPARATION; REMOVAL; FORCES; FIELD AB A two-step magnetically seeded filtration process that includes heterogeneous flocculation (shear-flow and Brownian) and magnetic filtration is examined experimentally. The effects of various parameters - magnetic-field strength, size of particles, flow rate, seeding concentration? and solution pH - on the removal efficiency are investigated. A breakthrough model - which combines trajectory analysis, a particle buildup model, and a bivariate population-balance model applicable for Brownian flocculation - is developed to predict particle breakthrough in a magnetic filter. Experiments show that the removal efficiency increases as magnetic-field strength and particle size are increased and flow rate is decreased. A maximum in the removal efficiency is observed at a certain seeding concentration and at the lower pH values, which is explained from competing effects that take place with respect to magnetic susceptibility and size of aggregates as the seeding concentration and solution pH are increased. Modeling results of the trajectory analysis show that the effect of hydrodynamic resistance becomes important as Reynolds number and particle size are increased or the magnetic-field strength is decreased. Similarly to experimental observations, the modeling results predict that the removal efficiency increases with increasing magnetic-field strength and particle size indicating that the relative importance of magnetic and drag forces and the aggregation rate in the flocculation step play an important role in the magnetically seeded process. The breakthrough model developed in this study provides a good description of the experimental breakthrough data obtained from magnetic filtration of paramagnetic particles and magnetically seeded filtration with Brownian-flocculation. (C) 1999 Elsevier Science Ltd. All rights reserved. C1 Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37381 USA. RP Yiacoumi, S (reprint author), Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. RI Tsouris, Costas/C-2544-2016 OI Tsouris, Costas/0000-0002-0522-1027 NR 34 TC 35 Z9 53 U1 1 U2 13 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0009-2509 J9 CHEM ENG SCI JI Chem. Eng. Sci. PD MAR PY 2000 VL 55 IS 6 BP 1101 EP 1113 DI 10.1016/S0009-2509(99)00383-8 PG 13 WC Engineering, Chemical SC Engineering GA 264FB UT WOS:000084169000006 ER PT J AU Chenna, A Perry, A Singer, B AF Chenna, A Perry, A Singer, B TI Synthesis of 8-(hydroxymethyl)-3,N-4-etheno-2'-deoxycytidine, a potential carcinogenic glycidaldehyde adduct, and its site-specific incorporation into DNA oligonucleotides SO CHEMICAL RESEARCH IN TOXICOLOGY LA English DT Article ID MOLECULAR DOSIMETRY; GUANOSINE; ACID AB The previously unreported glycidaldehyde adduct, 8-(hydroxymethyl)-3,N-4-etheno-2'-deoxycytidine (8-HM-epsilon dC), has been synthesized for the first time by reaction of 2'-deoxycytidine with bromoacetaldehyde at pH 4.5, followed by reduction with sodium borohydride. The adduct was characterized by UV, MS, and NMR. The compound was stable to neutral and acidic conditions but not in alkaline solution. The corresponding phosphoramidite was synthesized in good yield from the intermediate, 3,N-4-ethenocarbaldehyde-2'-deoxycytidine using the standard methodology and site-specifically incorporated in both 15- and 25-mer oligonucleotides, for studies on biochemical and biophysical properties. The resulting oligonucleotides were purified using HPLC, and the base composition was verified by HPLC after enzymatic digestion. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Donner Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Singer, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Donner Lab, Div Life Sci, Berkeley, CA 94720 USA. FU NCI NIH HHS [CA 72079, CA 47723] NR 21 TC 10 Z9 10 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0893-228X J9 CHEM RES TOXICOL JI Chem. Res. Toxicol. PD MAR PY 2000 VL 13 IS 3 BP 208 EP 213 DI 10.1021/tx990181m PG 6 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Toxicology SC Pharmacology & Pharmacy; Chemistry; Toxicology GA 297KV UT WOS:000086082800009 PM 10725118 ER PT J AU Gennett, T Dillon, AC Alleman, JL Jones, KM Hasoon, FS Heben, MJ AF Gennett, T Dillon, AC Alleman, JL Jones, KM Hasoon, FS Heben, MJ TI Formation of single-wall carbon nanotube superbundles SO CHEMISTRY OF MATERIALS LA English DT Article ID DIAMETER; GROWTH AB Carbon single-wall nanotubes (SWNTs) are of great interest because of their expected novel electronic, mechanical, and adsorption properties. However, to test these properties and develop applications, it is necessary to isolate large aligned nanotube bundles, Here we demonstrate that SWNT samples may be converted from seemingly endless 10-20 nm wide bundles into agglomerations of aligned nanotube bundles 0.4-1 mu m in diameter and 5-10 mu m in length A transmission electron microscope image of an isolated "superbundle" is shown. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Heben, MJ (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 13 TC 19 Z9 19 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAR PY 2000 VL 12 IS 3 BP 599 EP + DI 10.1021/cm9907108 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 296LR UT WOS:000086026300005 ER PT J AU Grush, MM Horne, CR Perera, RCC Ederer, DL Cramer, SP Cairns, EJ Callcott, TA AF Grush, MM Horne, CR Perera, RCC Ederer, DL Cramer, SP Cairns, EJ Callcott, TA TI Correlating electronic structure with cycling performance of substituted LiMn2O4 electrode materials: A study using the techniques of soft X-ray absorption and emission SO CHEMISTRY OF MATERIALS LA English DT Article ID ADVANCED LIGHT-SOURCE; FINE-STRUCTURE; MANGANESE OXIDES; SPECTROSCOPY; TRANSITION; SUPERCONDUCTORS; TEMPERATURE; BATTERIES; COMPLEXES; BEAMLINE AB Rechargeable batteries using LiMn2O4 cathodes are commercially attractive, if the problem of excessive capacity fading can be overcome. The cycling properties of these systems can be improved by partial metal substitution for the Mn. To understand the correlation between electrode performance and composition, Mn, Co, and Ni L-edge XAS and XES spectra of a series of LiMn2-yMeO4 samples (Me CO, Ni, Li) were recorded. Cobalt is shown to substitute into the spinel system as Co(III) and nickel as Ni(II). A positive correlation between the cycling stability of the electrode and. the covalency of the Mn is observed. C1 Univ Tennessee, Knoxville, TN 37996 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Tulane Univ, New Orleans, LA 70118 USA. Univ Calif Davis, Davis, CA 95616 USA. RP Grush, MM (reprint author), Univ Tennessee, Knoxville, TN 37996 USA. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 42 TC 19 Z9 19 U1 3 U2 32 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAR PY 2000 VL 12 IS 3 BP 659 EP 664 DI 10.1021/cm990366e PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 296LR UT WOS:000086026300013 ER PT J AU Covey, C AF Covey, C TI Beware the elegance of the number zero SO CLIMATIC CHANGE LA English DT Editorial Material C1 Univ Calif Lawrence Livermore Natl Lab, Program Climate Model Diagnosis & Intercomparison, Livermore, CA 94551 USA. RP Covey, C (reprint author), Univ Calif Lawrence Livermore Natl Lab, Program Climate Model Diagnosis & Intercomparison, Mail Code L-264, Livermore, CA 94551 USA. NR 4 TC 5 Z9 5 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD MAR PY 2000 VL 44 IS 4 BP 409 EP 411 DI 10.1023/A:1005572518719 PG 3 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA 269DW UT WOS:000084462100001 ER PT J AU Sgro, LA Koshland, CP Lucas, D Sawyer, RF AF Sgro, LA Koshland, CP Lucas, D Sawyer, RF TI Postflame reaction chemistry of dichloromethane: Variations in equivalence ratio and temperature SO COMBUSTION AND FLAME LA English DT Article ID HAZARDOUS-WASTE; FUEL-RICH; CHLORINATED HYDROCARBONS; THERMAL-DESTRUCTION; CHEMICAL STRUCTURES; METHYLENE-CHLORIDE; TRACE QUANTITIES; LAMINAR FLAMES; AIR EMISSIONS; CO OXIDATION AB We report on the destruction pathways and byproduct formation of dichloromethane (CH2Cl2) in conditions typical of incinerator postflame regions (injection temperature = 900-1200 K; equivalence ratio = 0.6, 0.9, 1.0, 1.1; residence time = 0.28-0.35 s). This is the first study to independently vary equivalence ratio and temperature, and evaluate their impacts on byproduct yield and destruction efficiency. We inject 750 ppm CH2Cl2 into postflame combustion products and measure byproducts with extractive FTIR spectroscopy. We use a detailed chemical kinetic mechanism and reaction rate analysis to predict the changes in reaction pathways as a function of equivalence ratio. The predictions for major products and several intermediate species compare well with experiments; the largest disparities are an underprediction of phosgene (CCl2O) and an overprediction of methyl chloride (CH3Cl). Both the experiment and the: numerical predictions show increased destruction at lower equivalence ratios. However, the experiments reveal increased levels of stable chlorinated organics at lower equivalence ratios, opposite to the numerical prediction. We discuss reasons for this discrepancy and implications of these results for designing control strategies to promote full conversion to HCl and to reduce chlorinated byproduct emissions. (C) 2000 by The Combustion institute. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Sch Publ Hlth, Dept Mech Engn, Berkeley, CA 94720 USA. RP Koshland, CP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Sch Publ Hlth, Dept Mech Engn, Berkeley, CA 94720 USA. RI Sawyer, Robert/B-5013-2014 NR 45 TC 8 Z9 9 U1 1 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAR PY 2000 VL 120 IS 4 BP 492 EP 503 DI 10.1016/S0010-2180(99)00119-4 PG 12 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA 279UQ UT WOS:000085063800008 ER PT J AU Barlow, RS Fiechtner, GJ Carter, CD Chen, JY AF Barlow, RS Fiechtner, GJ Carter, CD Chen, JY TI Experiments on the scalar structure of turbulent CO/H2N2 jet flames SO COMBUSTION AND FLAME LA English DT Article ID DIFFERENTIAL MOLECULAR-DIFFUSION; RAYLEIGH-LIF MEASUREMENTS; NONPREMIXED FLAMES; DAMKOHLER NUMBER; NITRIC-OXIDE; RAMAN; NO; TEMPERATURE; FUEL; OH AB Scalar and velocity measurements are reported for two turbulent jet flames of CO/H-2/N-2 (40/30/30 volume percent) having the same jet Reynolds number of 16,700 but different nozzle diameters (4.58 mm and 7.72 mm). Simultaneous measurements of temperature, the major species, OH, and NO are obtained using the combination of Rayleigh scattering, Raman scattering, and laser-induced fluorescence. Three-component laser-Doppler velocimetry measurements on the same flames were performed at ETH Zurich and are reported separately. This paper focuses on the scalar results but includes some limited velocity data. Axial profiles of mixture fraction, major species mole fractions, and velocity in these two flames are in close agreement when streamwise distance is scaled by nozzle diameter. However, OH mole fractions are lower and NO mole fractions are higher near the stoichiometric flame length in the larger flame due to the lower scalar dissipation rates and longer residence times. Turbulent flame measurements are compared with steady strained laminar flame calculations. Laminar calculations show remarkably close agreement with measured conditional means of the major species when all diffusivities are set equal to the thermal diffusivity. In contrast, laminar flame calculations that include the normal Chemkin treatment of molecular transport are clearly inconsistent with the measurements. These results suggest that turbulent stirring has a greater influence than molecular diffusion in determining major species concentrations at the flow conditions and locations considered in the present experiments, which begin at an axial distance of 20 nozzle diameters. Analysis of the conditional statistics of the differential diffusion parameter supports this conclusion, though some evidence of differential diffusion is observed. With regard to validation of turbulent combustion models, this data set provides a target that retains the geometric simplicity of the unpiloted jet flame in coflow, while including a chemical kinetic system of intermediate complexity between hydrogen flames and the simplest hydrocarbon flames. Aspects of the measurements, including Favre-averaged profiles, conditional statistics, mixture fraction pdf's, and departures from partial equilibrium, are presented and discussed in terms or their relevance to the testing of turbulent combustion submodels. The complete data are available on the World Wide Web for use in model validation studies. (C) 2000 by The Combustion Institute. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. Innovat Sci Solut Inc, Dayton, OH 45440 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. RP Barlow, RS (reprint author), Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. NR 39 TC 84 Z9 87 U1 3 U2 18 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAR PY 2000 VL 120 IS 4 BP 549 EP 569 DI 10.1016/S0010-2180(99)00126-1 PG 21 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA 279UQ UT WOS:000085063800013 ER PT J AU Christon, MA Roach, DW AF Christon, MA Roach, DW TI The numerical performance of wavelets for PDEs: the multi-scale finite element SO COMPUTATIONAL MECHANICS LA English DT Article; Proceedings Paper CT 10th International Conference on Computational Engineering Science (ICES) CY OCT 06-09, 1998 CL ATLANTA, GEORGIA ID SPACES AB The research summarized in this paper is part of a multi-year effort focused on evaluating the viability of wavelet bases for the solution of partial differential equations. The primary objective for this work has been to establish a foundation for hierarchical/wavelet simulation methods based upon numerical performance, computational efficiency, and the ability to exploit the hierarchical adaptive nature of wavelets. This work has demonstrated that hierarchical bases can be effective for problems with a dominant elliptic character. However, the strict enforcement of orthogonality in the usual L-2 sense is less desirable than orthogonality in the energy norm. This conclusion has led to;the development of a multi-scale linear finite element based on a hierarchical change-of-basis. This work considers the numerical and computational performance of the hierarchical Schauder basis in a Galerkin context. A unique row-column lumping procedure is developed with multi-scale solution strategies for 1-D and 2-D elliptic partial differential equations. C1 Sandia Natl Labs, Computat Phys R&D Dept, Albuquerque, NM 87185 USA. Univ Georgia, Dept Math, Athens, GA 30602 USA. RP Christon, MA (reprint author), Sandia Natl Labs, Computat Phys R&D Dept, M-S 0819,POB 5800, Albuquerque, NM 87185 USA. NR 13 TC 25 Z9 26 U1 0 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0178-7675 J9 COMPUT MECH JI Comput. Mech. PD MAR PY 2000 VL 25 IS 2-3 BP 230 EP 244 DI 10.1007/s004660050472 PG 15 WC Mathematics, Interdisciplinary Applications; Mechanics SC Mathematics; Mechanics GA 304AW UT WOS:000086461200011 ER PT J AU Patrick, M Voigt, R AF Patrick, M Voigt, R TI Advancing simulation science and engineering at disciplinary interfaces SO COMPUTING IN SCIENCE & ENGINEERING LA English DT Editorial Material C1 Univ Utah, Salt Lake City, UT 84112 USA. LANL, Los Alamos, NM USA. Coll William & Mary, Dept Comp Sci, Computat Sci Cluster, Williamsburg, VA 23089 USA. Oak Ridge Inst Sci & Educ, Dept Energy, ASCI Program, Oak Ridge, TN USA. RP Patrick, M (reprint author), Univ Utah, Salt Lake City, UT 84112 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 1521-9615 J9 COMPUT SCI ENG JI Comput. Sci. Eng. PD MAR-APR PY 2000 VL 2 IS 2 BP 14 EP 16 DI 10.1109/MCISE.2000.825745 PG 3 WC Computer Science, Interdisciplinary Applications SC Computer Science GA 289VW UT WOS:000085643500004 ER PT J AU Weigand, G Messina, P AF Weigand, G Messina, P TI Sea chances in computational power: Testing our metal SO COMPUTING IN SCIENCE & ENGINEERING LA English DT Editorial Material C1 US DOE, Washington, DC 20585 USA. RP Weigand, G (reprint author), US DOE, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 1521-9615 J9 COMPUT SCI ENG JI Comput. Sci. Eng. PD MAR-APR PY 2000 VL 2 IS 2 BP 17 EP + PG 5 WC Computer Science, Interdisciplinary Applications SC Computer Science GA 289VW UT WOS:000085643500005 ER PT J AU Rosner, R Calder, A Dursi, J Fryxell, B Lamb, DQ Niemeyer, JC Olson, K Ricker, P Timmes, FX Truran, JW Tufo, H Young, YN Zingale, M Lusk, E Stevens, R AF Rosner, R Calder, A Dursi, J Fryxell, B Lamb, DQ Niemeyer, JC Olson, K Ricker, P Timmes, FX Truran, JW Tufo, H Young, YN Zingale, M Lusk, E Stevens, R TI Flash code: Studying astrophysical thermonuclear flashes SO COMPUTING IN SCIENCE & ENGINEERING LA English DT Article ID NUCLEAR FLAMES; IA SUPERNOVAE; CONDUCTIVE PROPAGATION; RAY-BURSTS; MODEL; FLOW; C+O AB The Center for Astrophysical Thermonuclear Flashes is constructing a new generation of codes designed to study runaway thermonuclear burning on the surface or in the interior of evolved compact stars. C1 Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Argonne Natl Lab, Argonne, IL 60439 USA. RP Rosner, R (reprint author), Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA. RI Calder, Alan/E-5348-2011; Young, Yuan-Nan/L-6413-2015; OI Young, Yuan-Nan/0000-0001-9771-5480; Zingale, Michael/0000-0001-8401-030X; Dursi, Jonathan/0000-0002-4697-798X; Niemeyer, Jens/0000-0002-3063-4325 NR 35 TC 16 Z9 16 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 1521-9615 J9 COMPUT SCI ENG JI Comput. Sci. Eng. PD MAR-APR PY 2000 VL 2 IS 2 BP 33 EP 41 DI 10.1109/5992.825747 PG 9 WC Computer Science, Interdisciplinary Applications SC Computer Science GA 289VW UT WOS:000085643500007 ER PT J AU Crawford, D McCoy, D Nowak, D AF Crawford, D McCoy, D Nowak, D TI Our perspective on the alliance program's benefits SO COMPUTING IN SCIENCE & ENGINEERING LA English DT Article C1 Sandia Natl Labs, Model Based Design & Mfg Integrat Program, Livermore, CA 94551 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. Univ Calif Lawrence Livermore Natl Lab, ASCI Program, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Def & Nucl Technol Directorate, Livermore, CA 94550 USA. RP Crawford, D (reprint author), Sandia Natl Labs, Model Based Design & Mfg Integrat Program, MS 9003,POB 969, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 1521-9615 J9 COMPUT SCI ENG JI Comput. Sci. Eng. PD MAR-APR PY 2000 VL 2 IS 2 BP 77 EP 79 DI 10.1109/5992.825751 PG 3 WC Computer Science, Interdisciplinary Applications SC Computer Science GA 289VW UT WOS:000085643500011 ER PT J AU Gubernatis, J Hatano, N AF Gubernatis, J Hatano, N TI The multicanonical Monte Carlo method SO COMPUTING IN SCIENCE & ENGINEERING LA English DT Article ID ORDER PHASE-TRANSITIONS; SPIN-GLASS SIMULATIONS; ISING-MODEL; FREE-ENERGY; ALGORITHM; ENSEMBLE C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Aoyama Gakuin Univ, Dept Phys, Tokyo 1578572, Japan. RP Gubernatis, J (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Hatano, Naomichi/K-8176-2012 OI Hatano, Naomichi/0000-0003-0277-1856 NR 34 TC 9 Z9 9 U1 0 U2 4 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 1521-9615 J9 COMPUT SCI ENG JI Comput. Sci. Eng. PD MAR-APR PY 2000 VL 2 IS 2 BP 95 EP 102 PG 8 WC Computer Science, Interdisciplinary Applications SC Computer Science GA 289VW UT WOS:000085643500014 ER PT J AU Sewards, TV Sewards, MA AF Sewards, TV Sewards, MA TI Visual awareness due to neuronal activities in subcortical structures: A proposal SO CONSCIOUSNESS AND COGNITION LA English DT Review DE consciousness; visual awareness; synchronous oscillations; visual cortex; superior colliculus; optic tectum; substantia nigra; Sprague effect; blindsight ID CAT SUPERIOR COLLICULUS; NIGRA PARS RETICULATA; MESENCEPHALIC LOCOMOTOR REGION; LATERAL GENICULATE-NUCLEUS; PREY ORIENTING BEHAVIOR; IBOTENIC ACID LESIONS; FROG RANA-PIPIENS; SUBSTANTIA-NIGRA; STRIATE CORTEX; NIGROTECTAL PROJECTION AB It has been shown that visual awareness in the blind hemifield of hemianopic cats that have undergone unilateral ablations of visual cortex can be restored by sectioning the commissure of the superior colliculus or by destroying a portion of the substantia nigra contralateral to the cortical lesion (the Sprague effect). We propose that the visual awareness that is recovered is due to synchronized oscillatory activities in the superior colliculus ipsilateral to the cortical lesion. These oscillatory activities are normally partially suppressed by the inhibitory, GABAergic contralateral nigrotectal projection, and the destruction of the substantia nigra, or the sectioning of the collicular commissure, disinhibits the collicular neurons, causing an increase in the extent of oscillatory activity and/or synchronization between activities at different sites. This increase in the oscillatory and synchronized character is sufficient for the activities to give rise to visual awareness. We argue that in rodents and lower vertebrates, normal visual awareness is partly due to synchronized oscillatory activities in the optic tectum and partly due to similar activities in visual cortex. it is only in carnivores and primates that visual awareness is wholly due to cortical activities. Based on von Baerian recapitulation theory, we propose that, even in humans, there is a period in early infancy when visual awareness is partially due to activities in the superior colliculus, but that this awareness gradually disappears as the nigrotectal projection matures. (C) 2000 Academic Press. C1 Sandia Res Ctr, Placitas, NM 87043 USA. Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA. RP Sewards, TV (reprint author), Sandia Res Ctr, 21 Perdiz Canyon Rd, Placitas, NM 87043 USA. NR 160 TC 18 Z9 20 U1 0 U2 2 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1053-8100 J9 CONSCIOUS COGN JI Conscious. Cogn. PD MAR PY 2000 VL 9 IS 1 BP 86 EP 116 DI 10.1006/ccog.1999.0427 PG 31 WC Psychology, Experimental SC Psychology GA 300XP UT WOS:000086279300007 PM 10753495 ER PT J AU Willig, TN Gazda, H Sieff, CA AF Willig, TN Gazda, H Sieff, CA TI Diamond-Blackfan anemia SO CURRENT OPINION IN HEMATOLOGY LA English DT Article ID CONGENITAL HYPOPLASTIC-ANEMIA; BONE-MARROW TRANSPLANTATION; S19 RIBOSOMAL-PROTEIN; UMBILICAL-CORD-BLOOD; LONG-TERM SURVIVAL; HEMATOPOIETIC GROWTH-FACTORS; ADENOSINE-DEAMINASE ACTIVITY; HEPATOCELLULAR-CARCINOMA; THALASSEMIA MAJOR; CHROMOSOME 19Q13 AB Diamond Blackfan anemia is a rare congenital hypoplastic anemia that usually presents early in infancy. Congenital anomalies, in particular of the head and upper limbs, are present in about 25% of reported patients. The disease is characterized by a moderate to severe macrocytic anemia, occasional neutropenia or thrombocytosis, a normocellular bone marrow with erythroid hypoplasia, and an increased risk of developing leukemia. Recent genetic studies have led to the identification of mutations in the ribosomal protein RPS19 in approximately 25% of sporadic and familial cases, a second gene on chromosome 8p, and evidence for an additional locus (or loci). The pathogenesis is unknown. The majority of patients respond to prednisone, and often erythropoiesis can be maintained with low doses of the drug. Both remissions and increased resistance to steroid treatment can occur. Patients who do not respond to treatment are usually transfusion dependent, although responses to high dose steroid, androgen, and interleukin-3 have been observed. Bone marrow transplantation can be curative. (C) 2000 Lippincott Williams & Wilkins, Inc. C1 Dana Farber Canc Inst, Div Pediat Hematol & Oncol, Boston, MA 02115 USA. Hop Bicetre, Assistance Publ Hop Paris, Dept Pediat, F-94275 Le Kremlin Bicetre, France. Hop Bicetre, Assistance Publ Hop Paris, Hematol Lab, F-94275 Le Kremlin Bicetre, France. Univ Paris Sud, Fac Med Paris Sud, F-94275 Le Kremlin Bicetre, France. Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA USA. Childrens Hosp, Boston, MA 02115 USA. Harvard Univ, Childrens Hosp, Sch Med, Div Genet, Boston, MA 02115 USA. Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA. RP Sieff, CA (reprint author), Dana Farber Canc Inst, Dept Pediat Oncol, M613,44 Binney St, Boston, MA 02115 USA. RI Brugnara, Carlo/A-8041-2010 OI Brugnara, Carlo/0000-0001-8192-8713 NR 92 TC 54 Z9 55 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1065-6251 J9 CURR OPIN HEMATOL JI Curr. Opin. Hematol. PD MAR PY 2000 VL 7 IS 2 BP 85 EP 94 DI 10.1097/00062752-200003000-00003 PG 10 WC Hematology SC Hematology GA 379YT UT WOS:000165671300003 PM 10698294 ER PT J AU Gascard, P Mohandas, N AF Gascard, P Mohandas, N TI New insights into functions of erythroid proteins in nonerythroid cells SO CURRENT OPINION IN HEMATOLOGY LA English DT Article ID MEMBRANE CYTOSKELETAL PROTEIN-4.1; EPITHELIAL-CELLS; GOLGI-COMPLEX; BETA-SPECTRIN; STRUCTURAL PROTEIN-4.1; SKELETAL PROTEIN-4.1; BINDING-PROTEIN; ALPHA-SPECTRIN; ANKYRIN; IDENTIFICATION AB This article presents new insights into potential roles that three erythrocyte cytoskeletal proteins, protein 4.1, ankyrin, and spectrin, may play in nonerythroid nucleated cells. Each of these proteins is encoded by several closely related genes characterized by complex alternative splicing of their pre-mRNA, thus resulting in the cellular expression of a broad repertoire of isoforms that can adopt tissue- and cell-specific distribution. This could account for the presence of skeletal networks in intracellular organelles such as lysosomes, the Golgi apparatus, or the nucleus. In addition to providing structural support to cell membranes, these cytoskeletal proteins regulate the functions of various transmembrane proteins they interact with, in particular ion channels, as well as the activity of membrane-bound enzymes. Thus, they appear to be key players in major unsuspected cell functions such as protein sorting, dynamics of nuclear architecture during mitosis, or regulation of signal transduction pathways. (C) 2000 Lippincott Williams & Wilkins, Inc. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, Dept Subcellular Struct, Berkeley, CA 94720 USA. RP Gascard, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Life Sci, Dept Subcellular Struct, Berkeley, CA 94720 USA. NR 59 TC 45 Z9 46 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1065-6251 J9 CURR OPIN HEMATOL JI Curr. Opin. Hematol. PD MAR PY 2000 VL 7 IS 2 BP 123 EP 129 DI 10.1097/00062752-200003000-00009 PG 7 WC Hematology SC Hematology GA 379YT UT WOS:000165671300009 PM 10698300 ER PT J AU Keij, JF Bell-Prince, C Steinkamp, JA AF Keij, JF Bell-Prince, C Steinkamp, JA TI Staining of mitochondrial membranes with 10-nonyl acridine orange MitoFluor Green, and MitoTracker Green is affected by mitochondrial membrane potential altering drugs SO CYTOMETRY LA English DT Article DE flow cytometry; GM130 cells; HL60 cells; membrane potential; mitochondria; mitochondrial mass; U937 cells ID FLOW CYTOMETRIC ANALYSIS; LIVING CELLS; DELTA-PSI; RHODAMINE-123; APOPTOSIS; HEPATOCYTES; CARDIOLIPIN; INSITU; PROBE AB Background: We set out to develop an assay for the simultaneous analysis of mitochondrial membrane potential and mass using the probes 10-nonyl acridine orange (NAO), MitoFluor Green (MFG), and MitoTracker Green (MTG) in HL60 cells. However, in experiments in which NAO and MFG were combined with orange emitting mitochondrial membrane potential (Delta Psi(m)) probes, we found dear responses to Delta Psi(m), altering drugs for both probes. Methods: The three probes were titrated to determine whether saturation played a role in the response to drugs. The effects of a variety of Delta Psi(m), altering drugs were tested for MFG and MTG at probe concentrations of 20 nM and 200 nM and for NAO at 0.1 mu M and 5 mu M, using rhodamine 123 at 0.1 mu M as a reference probe. Results: Incubation of GM130, HL60, and U937 cells with 2,3-butanedione monoxime (BDM), nigericin, carbonyl cyanide 3-chlorophenylhydrazone (CCCP), carbonyl cyanide p-(trifluoromethoxy)phenylhydrazone (FCCP), 2,4-dinitrophenol (DNP), gramicidin, ouabain, and valinomycin resulted in increases of the fluorescence intensity for MFG or MTG with only a few exceptions. The fluorescence intensity of cells stained with 0.1 mu M NAO increased following incubation with BDM, nigericin, and decreased for FCCP, CCCP, DNP, gramicidin, and valinomycin. The results with 5 mu M NAO were similar. Conclusions: MFG, MTG, and NAO appeared poor choices for the membrane potential independent analysis of mitochondrial membrane mass. Considering the molecular structure of these probes that factor accumulation in the mitochondrial membrane because of a positive charge, our results are not surprising. Published 2000 Wiley-Liss, Inc. C1 Los Alamos Lab, Div Life Sci, Los Alamos, NM USA. RP Keij, JF (reprint author), DiaSorin Inc, 1990 Ind Blvd, Stillwater, MN 55082 USA. FU NCRR NIH HHS [P41-RR013150, R01-RR07855] NR 26 TC 96 Z9 97 U1 1 U2 11 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0196-4763 J9 CYTOMETRY JI Cytometry PD MAR 1 PY 2000 VL 39 IS 3 BP 203 EP 210 DI 10.1002/(SICI)1097-0320(20000301)39:3<203::AID-CYTO5>3.0.CO;2-Z PG 8 WC Biochemical Research Methods; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 287HY UT WOS:000085501500005 PM 10685077 ER PT J AU Easterling, MR Ellner, SP Dixon, PM AF Easterling, MR Ellner, SP Dixon, PM TI Size-specific sensitivity: Applying a new structured population model SO ECOLOGY LA English DT Article DE Aconitum noveboracense; continuous population structure; elasticity; integral projection model; matrix population models without the matrix; population growth rate; sensitivity analysis; size-specific sensitivity and elasticity; structured population model ID LIFE-HISTORY PARAMETERS; CATEGORY SIZE; CONSERVATION AB Matrix population models require the population to be divided into discrete stage classes. In many cases, especially when classes are defined by a continuous variable, such as length or mass, there are no natural breakpoints, and the division is artificial. We introduce the "integral projection model," which eliminates the need for division into discrete classes, without requiring any additional biological assumptions. Like a traditional matrix model, the integral projection model provides estimates of the asymptotic growth rare, stable size distribution, reproductive values, and sensitivities of the growth rate to changes in vital rates. However, where the matrix model represents the size distributions, reproductive value, and sensitivities as step functions (constant within a stage class), the integral projection model yields smooth curves fur each of these as a function of individual size. We describe a method for fitting the model to data, and we apply this method to data on an endangered plant species, northern monkshood (Aconitum noveboracense). With individuals classified by stem diameter. The matrix and integral models yield similar estimates of the asymptotic growth rate, bur the reproductive values and sensitivities in the matrix model are sensitive to the choice of stage classes. The integral projection model avoids this problem and yields size-specific sensitivities that are not affected by stags duration. These general properties of the integral projection model will make it advantageous for other populations where there is no natural division of individuals into stage classes. C1 N Carolina State Univ, Dept Stat, Biomath Program, Raleigh, NC 27695 USA. Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Ellner, SP (reprint author), N Carolina State Univ, Dept Stat, Biomath Program, Raleigh, NC 27695 USA. NR 35 TC 254 Z9 257 U1 14 U2 149 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 MAR PY 2000 VL 81 IS 3 BP 694 EP 708 DI 10.2307/177370 PG 15 WC Ecology SC Environmental Sciences & Ecology GA 289GD UT WOS:000085611400009 ER PT J AU Barron, MG Schultz, IR Newman, MC AF Barron, MG Schultz, IR Newman, MC TI Pharmacokinetics of intravascularly administered (65)Zinc in channel catfish (Ictalurus punctatus) SO ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY LA English DT Article DE catfish; compartmental model; half-life; zinc ID GAMBUSIA-AFFINIS; ZINC; TOXICOKINETICS; DISPOSITION; MERCURY; PLASMA; COPPER AB Comparison was made of the pharmacokinetics of the radioisotope (65)Zinc (Zn-65) in blood, plasma, and whole body of adult channel catfish (Ictalurus punctatus) following intravascular (iv) administration. A two-compartment model described the pharmacokinetics of Zn-65 in plasma and blood during the first 40 days following iv administration, but was unable to describe the longterm disposition of Zn-65. Whole-body counting revealed that approximately half of the Zn-65 dose was sequestered in a slowly exchangeable pool with a half-life of 1.5 years. Greater than 99% of the circulating Zn-65 was bound to plasma proteins, whereas there was less than 1% binding to red blood cells. Synthesis of the results for channel catfish and existing data in other species indicates three phases in the pharmacokinetics of zinc. The first phase consists of initial distribution outside the vascular system to kidney, liver, and other organs (alpha phase in blood and plasma; t(1/2) of 4 to 5 h). The second phase involves distribution from organs to a slowly exchangeable zinc pool, likely consisting of bone (beta phase in blood and plasma; alpha phase in whole body; t(1/2) of 4 to 20 days). The third phase appears to involve a slow turnover of sequestered zinc (t(1/2) greater than 1 year). Blood sampling or short-term whole-body measurements will underestimate the persistence of zinc in fish, thus prolonged sampling and measurement of whole-body concentrations are necessary to characterize the pharmacokinetics of zinc. (C) 2000 Academic Press. C1 PEAK Res, Longmont, CO 80501 USA. Battelle Mem Inst, PNNL, Mol Biosci Div, Richland, WA 99352 USA. Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA. RP Barron, MG (reprint author), PEAK Res, 1134 Avon Lane, Longmont, CO 80501 USA. NR 25 TC 1 Z9 1 U1 0 U2 2 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0147-6513 J9 ECOTOX ENVIRON SAFE JI Ecotox. Environ. Safe. PD MAR PY 2000 VL 45 IS 3 BP 304 EP 309 DI 10.1006/eesa.1999.1861 PG 6 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 292XF UT WOS:000085820100015 PM 10702351 ER PT J AU Johll, ME Asala, KS Swarts, M Anderegg, JW Johnson, DC AF Johll, ME Asala, KS Swarts, M Anderegg, JW Johnson, DC TI A voltammetric investigation of ethylamine oxidation at Ag, Au and Au80Ag20 electrodes in alkaline media SO ELECTROANALYSIS LA English DT Article DE silver; gold; silver-gold alloy; rotated disk electrodes; ethylamine oxidation ID OXYGEN-TRANSFER REACTIONS; PULSED ELECTROCHEMICAL DETECTION; GOLD ELECTRODES; PBO2-FILM ELECTRODES; ALLOY ELECTRODE; ELECTROCATALYSIS; RING AB A voltammetric comparison is presented for the anodic response of ethylamine at Ag, Au and Au80Ag20 rotated disk electrodes (RDEs) in carbonate buffer (pH 11.2). This study is part of a systematic search for unique anodic response mechanisms at binary alloy electrodes that are not existent at electrodes made from the pure component metals. The primary anodic response for ethylamine at the Au RDE corresponds to oxidative desorption of reactant concomitantly with formation of surface oxide (AuO) during the positive potential scan. For the Ag RDE, ethylamine enhances the anodic wave corresponding to formation of surface oxide (Ag2O) during the positive scan; however, the majority of this current enhancement is attributed to chemical stripping of Ag2O by the amine with formation of additional surface oxide. Evidence for this anodic stripping mechanism includes rapid roughening of the electrode surface. The response for ethylamine obtained at the Au80Ag20 RDE is concluded to correspond to the superposition of the response characteristic of Au electrodes with a response at the Ag sites that is dramatically different from the response observed at the pure Ag RDE. Data obtained by X-ray photoelectron spectroscopy (XPS) indicate that the surface composition of the Au80Ag20 electrode does not change as a result of exposure to ethylamine. Therefore, it is apparent that the Au matrix stabilizes the Ag atoms thereby preventing their dissolution from the Au80Ag20 electrode. The voltammetric response for ethylamine at the Ag sites observed during the positive scan is independent of rotational velocity; however, for the negative scan, an inverse Levich behavior is observed. Consideration is given to possible mechanisms to explain the ethylamine response at the Ag sites in the alloy electrode. C1 Iowa State Univ, Dept Chem, Microanalyt Instrumentat Ctr, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Johnson, DC (reprint author), Iowa State Univ, Dept Chem, Microanalyt Instrumentat Ctr, Ames, IA 50011 USA. NR 18 TC 10 Z9 10 U1 1 U2 3 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 1040-0397 J9 ELECTROANAL JI Electroanalysis PD MAR PY 2000 VL 12 IS 4 BP 248 EP 254 DI 10.1002/(SICI)1521-4109(20000301)12:4<248::AID-ELAN248>3.3.CO;2-R PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA 295JN UT WOS:000085963100002 ER PT J AU Lim, JT Zare, RN Bailey, CG Rakestraw, DJ Yan, C AF Lim, JT Zare, RN Bailey, CG Rakestraw, DJ Yan, C TI Separation of related opiate compounds using capillary electrochromatography SO ELECTROPHORESIS LA English DT Article DE capillary electrochromatography; opiate drugs; micellar electrokinetic chromatography ID SOLID-PHASE EXTRACTION; LIQUID-CHROMATOGRAPHY; ZONE ELECTROPHORESIS; PACKED CAPILLARIES; REVERSED-PHASE; BETA-BLOCKERS; URINE; DRUG; METABOLITES; COLUMNS AB Capillary electrophoretic separations have been investigated for six controlled narcotic analgesic compounds having related structures. Owing to the similar charge-to-mass ratios of these compounds, capillary zone electrophoresis failed to provide a satisfactory separation, whereas a baseline-resolved separation was achieved in 10 min using micellar electrokinetic chromatography. Column efficiencies of 40 000-150 000 plates/m were obtained with a 50 cm long, 50 mu m inner diameter (ID) capillary using 50 mM sodium dodecyl sulfate (SDS) in a 50 mM berate solution containing 12% isopropanol. In contrast, separation of this mixture by capillary electrochromatography proved to be significantly superior. The capillary was 15 cm long, with an ID of 75 mu m, and was packed with 1.5 mu m nonporous octadecyl silica (ODS) particles. The mobile phase consisted of 80% 10 mM tris(hydroxymethyl)aminomethane (Tris) and 20% acetonitrile, and contained 5 mM SDS. A complete separation was obtained in 2.5 min with an efficiency of 250 000-500 000 plates/m. C1 Stanford Univ, Dept Chem, Stanford, CA 94305 USA. Sandia Natl Labs, Livermore, CA USA. Unimicro Technol Inc, Pleasanton, CA USA. RP Zare, RN (reprint author), Stanford Univ, Dept Chem, Stanford, CA 94305 USA. RI Zare, Richard/A-8410-2009 NR 45 TC 24 Z9 25 U1 0 U2 3 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD MAR PY 2000 VL 21 IS 4 BP 737 EP 742 DI 10.1002/(SICI)1522-2683(20000301)21:4<737::AID-ELPS737>3.3.CO;2-H PG 6 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 292DT UT WOS:000085779400008 PM 10733214 ER PT J AU Roberts, KP Lin, CH Singhal, M Casale, GP Small, GJ Jankowiak, R AF Roberts, KP Lin, CH Singhal, M Casale, GP Small, GJ Jankowiak, R TI On-line identification of depurinating DNA adducts in human urine by capillary electrophoresis - fluorescence line narrowing spectroscopy SO ELECTROPHORESIS LA English DT Article DE depurinating DNA adducts; capillary electrophoresis; fluorescence line narrowing; analyte identification; one-electron oxidation ID POLYCYCLIC AROMATIC-HYDROCARBONS; MOUSE SKIN; METABOLIC-ACTIVATION; MASS-SPECTROMETRY; RADICAL CATIONS; COAL-TAR; BENZOPYRENE; QUANTITATION; EXPOSURE; CARCINOGENESIS AB The benzo[a]pyrene (BP)-derived 7-(benzo[a]pyren-6-yl)guanine (BP-6-N7Gua) depurinating one-electron oxidation adduct was identified in the urine extracts of coal-smoke-exposed humans for the first time. Urine samples were prepared by solid-phase extraction and reversed-phase high-performance liquid chromatography. Subsequently, the BP-6-N7Gua adduct was identified on-line with capillary electrophoresis fluorescence line narrowing spectroscopy (CE-FLNS) at 4.2 K. The daily excretion of BP-6-N7Gua in human urine of individuals exposed to coal smoke was approximately 226 pmol per mu mol of creatinine. Due to the high level of excretion we propose that BP6-N7Gua adducts found in urine could serve as effective biomarkers for risk assessment of BP exposure. The results demonstrate that CE-FLNS allows for on-line separation and DNA adducts identification in complex fluid extracts. C1 Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Univ Nebraska, Med Ctr, Eppley Inst Res Canc & Allied Dis, Omaha, NE 68182 USA. RP Jankowiak, R (reprint author), Iowa State Univ, Ames Lab, USDOE, 706 Gilman Hall, Ames, IA 50011 USA. FU NCI NIH HHS [P01 CA49210] NR 33 TC 33 Z9 33 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD MAR PY 2000 VL 21 IS 4 BP 799 EP 806 DI 10.1002/(SICI)1522-2683(20000301)21:4<799::AID-ELPS799>3.3.CO;2-M PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 292DT UT WOS:000085779400019 PM 10733225 ER PT J AU Song, JM Yeung, ES AF Song, JM Yeung, ES TI Alternative base-calling algorithm for DNA sequencing based on four-label multicolor detection SO ELECTROPHORESIS LA English DT Article DE DNA sequencing; four-label multicolor detection; base calling ID CAPILLARY GEL-ELECTROPHORESIS; FLUORESCENCE DETECTION; ARRAY ELECTROPHORESIS; SYSTEM AB A simple base-calling scheme based on four-label multicolor detection is suggested for DNA sequencing. The entire spectra of the dye labels were used for identification. Specifically, the maxima of the emission spectra rather than the intensity ratios at selected wavelengths are used to provide excellent discrimination. Capillary gel electrophoresis was used for the separation of DNA fragments. Data acquisition and analysis compatible with fast and high-throughput imaging detection was accomplished. The accuracy of base calling of PGEM/U DNA from the raw data obtained with 5 nm and 7 nm spectroscopic resolution were 98.4% for 386 bases and 98.4% for 385 bases. Base calling of M13mp18 DNA showed 98.3% accuracy for 420 bases. C1 Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Yeung, ES (reprint author), Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. NR 23 TC 5 Z9 5 U1 0 U2 1 PU WILEY-V C H VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD MAR PY 2000 VL 21 IS 4 BP 807 EP 815 DI 10.1002/(SICI)1522-2683(20000301)21:4<807::AID-ELPS807>3.3.CO;2-P PG 9 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 292DT UT WOS:000085779400020 PM 10733226 ER PT J AU Chen, MH Sheng, JS Hind, G Handa, AK Citovsky, V AF Chen, MH Sheng, JS Hind, G Handa, AK Citovsky, V TI Interaction between the tobacco mosaic virus movement protein and host cell pectin methylesterases is required for viral cell-to-cell movement SO EMBO JOURNAL LA English DT Article DE movement proteins; pectin methylesterases; plant viruses; plasmodesmata; tobacco ID NUCLEOTIDE-SEQUENCE; 2-HYBRID SYSTEM; NUCLEIC-ACIDS; PLASMODESMATA; TRANSPORT; PLANTS; PECTINESTERASE; LOCALIZATION; INFECTION; BINDING AB Virus-encoded movement protein (MP) mediates cell-to-cell spread of tobacco mosaic virus (TMV) through plant intercellular connections, the plasmodesmata. The molecular pathway by which TMV MP interacts with the host cell is largely unknown. To understand this process better, a cell wall-associated protein that specificallly binds the viral MP was purified from tobacco leaf cell walls and identified as pectin methylesterase (PME), In addition to TMV MP, PME is recognized by MPs of turnip vein clearing virus (TVCV) and cauliflower mosaic virus (CaMV). The use of amino acid deletion mutants of TMV MP showed that its domain was necessary and sufficient for association with PME. Deletion of the PME-binding region resulted in inactivation of TMV cell-to-cell movement. C1 SUNY Stony Brook, Dept Biochem & Cell Biol, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. Purdue Univ, Dept Hort, W Lafayette, IN 47907 USA. RP Citovsky, V (reprint author), SUNY Stony Brook, Dept Biochem & Cell Biol, Stony Brook, NY 11794 USA. FU NIGMS NIH HHS [GM50224, R01 GM050224] NR 44 TC 183 Z9 197 U1 0 U2 12 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0261-4189 J9 EMBO J JI Embo J. PD MAR 1 PY 2000 VL 19 IS 5 BP 913 EP 920 DI 10.1093/emboj/19.5.913 PG 8 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 291RJ UT WOS:000085749600013 PM 10698933 ER PT J AU Rosen, K Meier, A AF Rosen, K Meier, A TI Power measurements and national energy consumption of televisions and videocassette recorders in the USA SO ENERGY LA English DT Article AB The combined energy consumption of US televisions and videocassette recorders was about 40 TW h per year in 1998, corresponding to 3.6% of national residential electricity consumption. The average household television energy consumption was about 310 kW h per year, 23% of which was used while the units were not active. The average household videocassette recorder energy use was about 100 kW h per year, 95% of which was used while the units were not active. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Rosen, K (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS90-2000, Berkeley, CA 94720 USA. NR 11 TC 7 Z9 7 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-5442 J9 ENERGY JI Energy PD MAR PY 2000 VL 25 IS 3 BP 219 EP 232 DI 10.1016/S0360-5442(99)00069-9 PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA 289QE UT WOS:000085632800002 ER PT J AU Shihadeh, A Hochgreb, S AF Shihadeh, A Hochgreb, S TI Diesel engine combustion of biomass pyrolysis oils SO ENERGY & FUELS LA English DT Article ID WOOD AB To investigate their ignition delay and combustion behavior, experiments with two biomass pyrolysis oils and No. 2 diesel fuel were performed in a direct injection diesel engine. It was found that while the indicated thermal efficiency of both pyrolysis oils equaled that of the diesel fuel, they exhibited excessive ignition delays and required a moderate degree of combustion air preheating to ignite reliably. Despite the longer ignition delays associated with the pyrolysis oils, the cylinder pressure rise rates were significantly less than with No. 2 diesel fuel. Experimental ignition delay and heat release rates were interpreted using a phenomenological spray combustion model. Using a three parameter fit for vaporization, ignition, and combustion rate, the model showed that the longer ignition delays of the bio-oils result from slow chemistry relative to diesel fuel. The model also showed that the heat release profiles of the bio-oils are consistent with slow combustion chemistry and rapid mixing relative to diesel fuel. As a result, whereas diesel combustion is predominantly mixing limited, pyrolysis oil combustion is predominantly limited by chemistry through much of the process. C1 MIT, Dept Mech Engn, Cambridge, MA 02139 USA. RP Hochgreb, S (reprint author), Sandia Natl Labs, POB 969,MS 9053, Livermore, CA 94550 USA. RI Shihadeh, Alan/F-1646-2011; OI Shihadeh, Alan/0000-0001-6387-8564 NR 18 TC 58 Z9 63 U1 0 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 2000 VL 14 IS 2 BP 260 EP 274 DI 10.1021/ef990044x PG 15 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA 296NW UT WOS:000086031300002 ER PT J AU Dyrkacz, GR Bloomquist, CAA AF Dyrkacz, GR Bloomquist, CAA TI Changes in coal extractability with timed addition of tetracyanoethylene in carbon disulfide/N-methylpyrrolidone extractions SO ENERGY & FUELS LA English DT Article ID CS2-N-METHYL-2-PYRROLIDINONE MIXED-SOLVENT C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Dyrkacz, GR (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 12 Z9 12 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 2000 VL 14 IS 2 BP 513 EP 514 DI 10.1021/ef9902449 PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA 296NW UT WOS:000086031300033 ER PT J AU Stevens, TO McKinley, JP AF Stevens, TO McKinley, JP TI Abiotic controls on H-2 production from basalt-water reactions and implications for aquifer biogeochemistry SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ENVIRONMENTAL SIGNIFICANCE; MICROBIAL ECOSYSTEMS; HYDROGEN GAS; DEEP; IRON; SERPENTINIZATION; GENERATION; SUBSURFACE; REDUCTION; KINETICS AB Abiotic production of H-2 from basalt reactions in aqueous solutions is hypothesized to support microbial ecosystems in deep subsurface aquifers, such as those found in the Columbia River Basalt group (CRB). We investigated factors controlling this phenomenon, including rock composition, pH, temperature, sterilization method, reducing agents, and product removal. Ferrous silicate minerals were found to be the basalt components responsible for H-2 production from anaerobic water-rock interactions. H-2 evolution was faster at pH < 7 hut occurred from pH 5 to pH 11, which covers the pH range(7-10)measured in CRB groundwaters. The onset of H-2 evolution coincided with the appearance of dissolved Fe2+, and an apparent alkaline inhibition could be alleviated by the addition of excess FeCl2. This may reflect, in part, the low redox conditions needed for H-2 evolution and suggests that H-2 may be controlled by reaction rates of ferrous silicate minerals. Rates were higher at 60 degrees C than at 30 degrees C, suggesting that the geothermal gradient may lead to increased H-2 production at depth. The results were consistent with the hypothesis that basalt-redox reactions support primary production by microorganisms in some terrestrial subsurface environments. C1 Pacific NW Lab, Richland, WA 99352 USA. RP Stevens, TO (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 42 TC 51 Z9 52 U1 2 U2 20 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 MAR 1 PY 2000 VL 34 IS 5 BP 826 EP 831 DI 10.1021/es990583g PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 289GV UT WOS:000085612900035 ER PT J AU Ripp, S Nivens, DE Ahn, Y Werner, C Jarrell, J Easter, JP Cox, CD Burlage, RS Sayler, GS AF Ripp, S Nivens, DE Ahn, Y Werner, C Jarrell, J Easter, JP Cox, CD Burlage, RS Sayler, GS TI Controlled field release of a bioluminescent genetically engineered microorganism for bioremediation process monitoring and control SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID PSEUDOMONAS-FLUORESCENS; REPORTER; SURVIVAL; NAPHTHALENE; BACTERIA; SOIL; TRICHLOROETHYLENE; CONSTRUCTION; BIOSENSOR; TOLUENE AB Pseudomonas fluorescens HK44 represents the first genetically engineered microorganism approved for field testing in the United States for bioremediation purposes. Strain HK44 harbors an introduced lux gene fused within a naphthalene degradative pathway, thereby allowing this recombinant microbe to bioluminesce as it degrades specific polyaromatic hydrocarbons such as naphthalene. The biore-mediation process can therefore be monitored by the detection of light. P. fluorescens HK44 was inoculated into the vadose zone of intermediate-scale, semicontained soil lysimeters contaminated with naphthalene, anthracene, and phenanthrene, and the population dynamics were followed over an approximate 2-year period in order to assess the long-term efficacy of using strain HK44 for monitoring and controlling bioremediation processes. Results showed that P, fluorescens HK44 was capable of surviving initial inoculation into both hydrocarbon contaminated and uncontaminated soils and was recoverable from these soils 660 days post inoculation. It was also demonstrated that strain HK44 was capable of generating bioluminescence in response to soil hydrocarbon bioavailability. Bioluminescence approaching 166 000 counts/s was detected in fiber optic-based biosensor devices responding to volatile polyaromatic hydrocarbons, while a portable photomultiplier module detected bioluminescence at an average of 4300 counts/s directly from soil-borne HK44 cells within localized treatment areas. The utilization of lux-based bio-reporter microorganisms therefore promises to be a viable option for in situ determination of environmental contaminant bioavailability and biodegradation process monitoring and control. C1 Univ Tennessee, Ctr Environm Biotechnol, Dept Microbiol, Knoxville, TN 37996 USA. Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Sayler, GS (reprint author), Univ Tennessee, Ctr Environm Biotechnol, Dept Microbiol, 676 Dabney Hall, Knoxville, TN 37996 USA. EM sayler@utk.edu RI Ripp, Steven/B-2305-2008; Cox, Chris/A-9451-2013 OI Ripp, Steven/0000-0002-6836-1764; Cox, Chris/0000-0001-9818-5477 NR 29 TC 88 Z9 91 U1 3 U2 28 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 MAR 1 PY 2000 VL 34 IS 5 BP 846 EP 853 DI 10.1021/es9908319 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 289GV UT WOS:000085612900038 ER PT J AU Rizzi, V Viesti, G Bazzacco, D Algora-Pineda, A Appelbe, D de Angelis, G Belcari, N Cinausero, M De Poli, M Drake, TE Gadea, A Galindo-Uribarri, A Gelli, N Fabris, D Farnea, E Fioretto, E Krolas, W Kroll, T Lucarelli, F Lunardi, S Lunardon, M Martinez, T Menegazzo, R Nayak, BK Nebbia, G Napoli, DR Nyako, B Petrache, C Podolyak, Z Prete, G Alvarez, CR Samant, A Spolaore, P Ur, C Zuber, K AF Rizzi, V Viesti, G Bazzacco, D Algora-Pineda, A Appelbe, D de Angelis, G Belcari, N Cinausero, M De Poli, M Drake, TE Gadea, A Galindo-Uribarri, A Gelli, N Fabris, D Farnea, E Fioretto, E Krolas, W Kroll, T Lucarelli, F Lunardi, S Lunardon, M Martinez, T Menegazzo, R Nayak, BK Nebbia, G Napoli, DR Nyako, B Petrache, C Podolyak, Z Prete, G Alvarez, CR Samant, A Spolaore, P Ur, C Zuber, K TI Search for hyperdeformed structures populated in the Cl-37+Sn-120 reaction by using EUROBALL III SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article ID DETECTOR; NUCLEI; DY-152 AB The ridge structure with Delta E-gamma=+/- 30 keV, observed in the past in coincidence with protons emitted in the reaction 187 MeV Cl-37+ Sn-120 and attributed to an hyperdeformed nuclear shape in Dy-152, has been studied in a new experiment performed with the EUROBALL III array. The ridge is now observed in coincidence with transitions in the yrast superdeformed band of 152Dy but no discrete rotational bands have been identified. C1 Ist Nazl Fis Nucl, I-35131 Padua, Italy. Univ Padua, Dipartimento Fis, I-35131 Padua, Italy. Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy. Univ Liverpool, Oliver Lodge Lab, Liverpool L69 3BX, Merseyside, England. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Univ Florence, Dipartimento Fis, I-50125 Florence, Italy. Inst Nucl Res, ATOMKI, H-4001 Debrecen, Hungary. H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland. RP Rizzi, V (reprint author), Ist Nazl Fis Nucl, I-35131 Padua, Italy. RI prete, gianfranco/A-9244-2012; Lucarelli, Franco/F-3465-2013; Krolas, Wojciech/N-9391-2013; Petrache, Costel/E-9867-2012; Cinausero, Marco/K-2752-2014; Martinez, Trinitario/K-6785-2014; Gadea, Andres/L-8529-2014; Napoli, Daniel R./D-9863-2012; Menegazzo, Roberto/J-5853-2012; Belcari, Nicola/M-4811-2015 OI Lucarelli, Franco/0000-0001-7772-8858; Petrache, Costel/0000-0001-8419-1390; Martinez, Trinitario/0000-0002-0683-5506; Gadea, Andres/0000-0002-4233-1970; Napoli, Daniel R./0000-0002-8154-6958; Menegazzo, Roberto/0000-0002-3060-5276; Belcari, Nicola/0000-0002-7648-9450 NR 13 TC 8 Z9 8 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD MAR PY 2000 VL 7 IS 3 BP 299 EP 301 DI 10.1007/PL00013606 PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 314HF UT WOS:000087049800001 ER PT J AU Benhar, O Fantoni, S Lykasov, GI AF Benhar, O Fantoni, S Lykasov, GI TI Backward hadron production in neutrino-nucleus interactions SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article ID GLUON STRING MODEL; SCATTERING; TARGETS AB The production of backward pions in lepton-nucleus collisions is analyzed. We show that a large yield of high momentum backward pions can be explained by the Regge asymptotic of the distribution of nucleons carrying a large momentum fraction in the nuclear target. The calculated spectra of pions emitted in the nu + Nc --> mu + pi(-) + X and nu + H-2 --> mu + pi(-) + X reactions are in satisfactory agreement with the available experimental data. C1 Jefferson Lab, Newport News, VA 23606 USA. Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA. SISSA, Int Sch Adv Studies, I-30014 Trieste, Italy. Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia. RP Benhar, O (reprint author), Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy. RI Benhar, Omar/J-6044-2012 OI Benhar, Omar/0000-0001-6818-9215 NR 16 TC 7 Z9 7 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD MAR PY 2000 VL 7 IS 3 BP 415 EP 419 DI 10.1007/s100500050411 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 314HF UT WOS:000087049800017 ER PT J AU Abbott, D Ahmidouch, A Anklin, H Arvieux, J Ball, J Beedoe, S Beise, EJ Bimbot, L Boeglin, W Breuer, H Carlini, R Chant, NS Danagoulian, S Dow, K Ducret, JE Dunne, J Ewell, L Eyraud, L Furget, C Garcon, M Gilman, R Glashausser, C Gueye, P Gustafsson, K Hafidi, K Honegger, A Jourdan, J Kox, S Kumbartzki, G Lu, L Lung, A Markowitz, P McIntyre, J Meekins, D Merchez, F Mitchell, J Mohring, R Mtingwa, S Mrktchyan, H Pitz, D Qin, L Ransome, R Real, JS Roos, PG Rutt, P Sawafta, R Stepanyan, S Tieulent, R Tomasi-Gustafsson, E Turchinetz, W Vansyoc, K Volmer, J Voutier, E Williamson, C Wood, SA Yan, C Zhao, J Zhao, W AF Abbott, D Ahmidouch, A Anklin, H Arvieux, J Ball, J Beedoe, S Beise, EJ Bimbot, L Boeglin, W Breuer, H Carlini, R Chant, NS Danagoulian, S Dow, K Ducret, JE Dunne, J Ewell, L Eyraud, L Furget, C Garcon, M Gilman, R Glashausser, C Gueye, P Gustafsson, K Hafidi, K Honegger, A Jourdan, J Kox, S Kumbartzki, G Lu, L Lung, A Markowitz, P McIntyre, J Meekins, D Merchez, F Mitchell, J Mohring, R Mtingwa, S Mrktchyan, H Pitz, D Qin, L Ransome, R Real, JS Roos, PG Rutt, P Sawafta, R Stepanyan, S Tieulent, R Tomasi-Gustafsson, E Turchinetz, W Vansyoc, K Volmer, J Voutier, E Williamson, C Wood, SA Yan, C Zhao, J Zhao, W CA Jefferson Lab t20 Collaboration TI Phenomenology of the deuteron electromagnetic form factors SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article ID STRUCTURE-FUNCTION A(Q(2)); ELASTIC-SCATTERING; MOMENTUM-TRANSFER; ELECTRON-SCATTERING; TARGET; ASYMMETRY; RADIUS AB A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the ii-momentum transfer, is presented. Then the world data Fur elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm(-1). This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. CEA, SPhN, DAPNIA, F-91191 Gif Sur Yvette, France. Univ Grenoble 1, IN2P3, ISN, F-38026 Grenoble, France. Univ Basel, Dept Phys, CH-4056 Basel, Switzerland. Univ Maryland, College Pk, MD 20742 USA. MIT Bates Linear Accelerator, Middleton, MA 01949 USA. Rutgers State Univ, Piscataway, NJ 08855 USA. Florida Int Univ, Miami, FL 33199 USA. N Carolina Agr & Technol State Univ, Greensboro, NC 27411 USA. LNS Saclay, F-91191 Gif Sur Yvette, France. Yerevan Phys Inst, Yerevan 375036, Armenia. IN2P3, IPNO, F-91406 Orsay, France. RP Abbott, D (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RI McIntyre, Justin/P-1346-2014; Lu, Lanchun/E-3551-2011 OI McIntyre, Justin/0000-0002-3706-4310; NR 41 TC 93 Z9 94 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD MAR PY 2000 VL 7 IS 3 BP 421 EP 427 DI 10.1007/PL00013629 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 314HF UT WOS:000087049800018 ER PT J AU Strempfer, J Bruckel, T Caliebe, W Vernes, A Ebert, H Prandl, W Schneider Jr AF Strempfer, J Bruckel, T Caliebe, W Vernes, A Ebert, H Prandl, W Schneider, JR TI Form-factor measurements on chromium with high-energy synchrotron radiation SO EUROPEAN PHYSICAL JOURNAL B LA English DT Article ID X-RAY-SCATTERING; TRIPLE-CRYSTAL DIFFRACTOMETER; BULK MAGNETIC SCATTERING; CHARGE-DENSITY WAVES; RESOLUTION FUNCTION; LAUE GEOMETRY; CROSS-SECTION; SPIN; DIFFRACTION; HOLMIUM AB Results of high-energy magnetic X-ray diffraction on pure antiferromagnetic chromium are presented. The temperature dependence of the propagation vector of the spin-density wave (SDW) and the strain-ware (SW) could be reproduced. The temperature dependence of the magnetic integrated intensity could be measured in the transversally as weil as in the longitudinally polarised SDW phase. The magnetic form-factor has been determined in the transversally polarised SDW phase with five magnetic satellites. For the first time a spin-orbit separation has been performed by comparing X-ray to neutron data. The small orbital contribution to the magnetisation density turns out to be negligible, in agreement to our relativistic band-structure calculations. In addition, measurements of strain-wave reflections have been undertaken, and the results complement previous studies. C1 Deutsch Elektronen Synchrotron DESY, Hamburger Synchrontronstschlungslab HASYLAB, D-22603 Hamburg, Germany. Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany. Univ Munich, Inst Chem Phys, D-81377 Munich, Germany. Univ Tubingen, Inst Kristallog, D-72070 Tubingen, Germany. RP Strempfer, J (reprint author), Argonne Natl Lab, Adv Photon Source, CAT, BESSRC, 9700 S Cass Ave, Argonne, IL 60439 USA. EM strempfer@anl.gov RI Bruckel, Thomas/J-2968-2013; Vernes, Andras/H-2465-2014 OI Bruckel, Thomas/0000-0003-1378-0416; Vernes, Andras/0000-0003-2750-9811 NR 45 TC 10 Z9 10 U1 1 U2 3 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6028 J9 EUR PHYS J B JI Eur. Phys. J. B PD MAR PY 2000 VL 14 IS 1 BP 63 EP 72 DI 10.1007/s100510050107 PG 10 WC Physics, Condensed Matter SC Physics GA 293UR UT WOS:000085872200008 ER PT J AU Ovchinnikov, YN Kresin, VZ AF Ovchinnikov, YN Kresin, VZ TI Magnetic scattering and unusual behavior of the critical fields and other parameters: Application to borocarbides SO EUROPEAN PHYSICAL JOURNAL B LA English DT Article ID SINGLE-CRYSTAL; SUPERCONDUCTIVITY; YNI2B2C; SUSCEPTIBILITY; LUNI2B2C; STATE AB The pair-breaking effect and its impact on the properties of borocarbides is studied. The pair-breaking effect caused by localized magnetic moments drastically affects the superconducting properties. Interaction between the magnetic moments and the resulting ordering trend lead to a behavior entirely different from the conventional picture. The main focus is on the behavior of the upper (H-c2) and lower (H-c1) critical fields. In addition, the temperature dependence of several quantities (penetration depth, coherence length, etc.) has been calculated. The theory has been applied to the borocarbide LuNi2B2C and is in very good agreement with the recent experimental data. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Ovchinnikov, YN (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM vzkresin@lbl.gov NR 32 TC 7 Z9 7 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6028 J9 EUR PHYS J B JI Eur. Phys. J. B PD MAR PY 2000 VL 14 IS 2 BP 203 EP 209 DI 10.1007/s100510050121 PG 7 WC Physics, Condensed Matter SC Physics GA 303EY UT WOS:000086410100001 ER PT J AU Garanin, DA Kladko, K Fulde, P AF Garanin, DA Kladko, K Fulde, P TI Quasiclassical Hamiltonians for large-spin systems SO EUROPEAN PHYSICAL JOURNAL B LA English DT Article ID CLASSICAL MAGNETS; 1/D EXPANSION; QUANTUM; THERMODYNAMICS AB We extend and apply a previously developed method for a semiclassical treatment of a system with large spin S. A multisite Heisenberg Hamiltonian is transformed into an effective classical Hamilton function which can be treated by standard methods for classical systems. Quantum effects enter in form of multispin interactions in the Hamilton function. The latter is written in the form of an expansion in powers of J/(TS), where J is the coupling constant. Main ingredients of our method are spin coherent states and cumulants. Rules and diagrams are derived for computing cumulants of groups of operators entering the Hamiltonian. The theory is illustrated by calculating the quantum corrections to the free energy of a Heisenberg chain which were previously computed by a Wigner-Kirkwood expansion. C1 Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany. LANL, Div Theoret, Condensed Matter Phys Grp, Los Alamos, NM 87545 USA. LANL, Div Theoret, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Garanin, DA (reprint author), Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden, Germany. EM garanin@mpipks-dresden.mpg.de NR 14 TC 10 Z9 10 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6028 J9 EUR PHYS J B JI Eur. Phys. J. B PD MAR PY 2000 VL 14 IS 2 BP 293 EP 300 DI 10.1007/s100510050132 PG 8 WC Physics, Condensed Matter SC Physics GA 303EY UT WOS:000086410100012 ER PT J AU Unanyan, R Guerin, S Shore, BW Bergmann, K AF Unanyan, R Guerin, S Shore, BW Bergmann, K TI Efficient population transfer by delayed pulses despite coupling ambiguity SO EUROPEAN PHYSICAL JOURNAL D LA English DT Article ID RAMAN ADIABATIC PASSAGE; MULTILEVEL SYSTEMS; MAGNETIC SUBLEVELS; COHERENT; FIELDS; ATOMS; TRANSITIONS; MOLECULES; STATES; LASERS AB In traditional schemes of multilevel multilaser excitation, each laser pulse interacts with only one pair of states, and the rotating wave approximation (RWA) is applicable. Here pie study the population transfer process in a three-state system when each of the two lasers interacts with each of the pair of states and when the Rabi frequencies characterizing tl-le interaction strengths of che system are comparable to or larger than the difference of the transition frequencies. We show that complete and robust population transfer is possible under conditions more general than those hitherto considered necessary for stimulated Raman adiabatic passage (STIRAP) or for successive pi pulses. Using adiabatic Floquet theory we show that successful population transfer can be interpreted as adiabatic passage by means of a transfer state which collects the initial and final states. The Floquet picture offers a convenient interpretation of the population transfer as accompanied by multiple absorption of photons from or emission into the laser fields. C1 Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. Armenian Acad Sci, Inst Phys Res, Ashtarak 378410 2, Armenia. Univ Bourgogne, CNRS, Phys Lab, F-21078 Dijon, France. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Unanyan, R (reprint author), Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany. RI BERGMANN, KLAAS/D-5543-2011 NR 30 TC 25 Z9 25 U1 2 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6060 J9 EUR PHYS J D JI Eur. Phys. J. D PD MAR PY 2000 VL 8 IS 3 BP 443 EP 449 DI 10.1007/s100530050054 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA 313DA UT WOS:000086984000015 ER PT J AU Lancon, F Penisson, JM Dahmen, U AF Lancon, F Penisson, JM Dahmen, U TI Quasicrystalline gold interface with a hypo-friction property SO EUROPHYSICS LETTERS LA English DT Article ID GRAIN-BOUNDARIES; MODEL; ALUMINUM; SIMULATION; MICROSCOPY; CRYSTALS; SYSTEMS; HREM AB We have studied a non-symmetric and non-periodic grain boundary in gold. An atomic model is presented and the atomic positions are found to be in agreement with the electron microscopy images. Using the diffraction pattern, we show that the structure is quasicrystalline and related to the irrational number root 2. A complete hyperspace periodic description of the interface is given. We use this theoretical view to predict that in the case of an infinite interface of this type, two crystals should glide freely along the incommensurate x-direction whereas they should be blocked along the commensurate z-direction and be adhesive along the third y-direction perpendicular to the boundary. A numerical test confirms this property. C1 CEA Grenoble, Dept Rech Fondamentale Mat Condensee, SP2M, F-38054 Grenoble 9, France. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA. RP Lancon, F (reprint author), CEA Grenoble, Dept Rech Fondamentale Mat Condensee, SP2M, F-38054 Grenoble 9, France. RI Lancon, Frederic/B-2577-2009 OI Lancon, Frederic/0000-0002-6367-4462 NR 21 TC 22 Z9 22 U1 0 U2 0 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAR PY 2000 VL 49 IS 5 BP 603 EP 609 DI 10.1209/epl/i2000-00193-6 PG 7 WC Physics, Multidisciplinary SC Physics GA 293UG UT WOS:000085871300010 ER PT J AU Putz, M Kremer, K Grest, GS AF Putz, M Kremer, K Grest, GS TI What is the entanglement length in a polymer melt? SO EUROPHYSICS LETTERS LA English DT Article ID SELF-DIFFUSION COEFFICIENT; MOLECULAR-DYNAMICS; CHAIN; SPECTROSCOPY; POLYETHYLENE; REPTATION; VISCOSITY AB We present the results of molecular dynamics simulations of very long model polymer chains analyzed by various experimentally relevant techniques. The segment motion of the chains is found to be in very good agreement with the reptation model. For comparison with experimental results we also calculated the plateau modulus G(N)(0) via stress-strain simulations. The predictions of the entanglement length N-e from G(N)(0) and from the mean-square dispacement of the chain segments disagree by a factor of about 2.3(2), indicating an error in the prefactor in the standard formula for G(N)(0) which is important for the analysis of many simulation results as well as the interpretation of experimental neutron spin echo (NSE) and NMR measurements. We explicitly show how recent NSE measurements are affected by this and some finite-size effects in the interpretation of the dynamic structure factor. C1 Max Planck Inst Polymerforsch, D-55021 Mainz, Germany. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Putz, M (reprint author), Univ New Mexico, Albuquerque, NM 87106 USA. RI Kremer, Kurt/G-5652-2011; MPIP, Theory/I-9884-2014 NR 23 TC 152 Z9 152 U1 7 U2 44 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAR PY 2000 VL 49 IS 6 BP 735 EP 741 DI 10.1209/epl/i2000-00212-8 PG 7 WC Physics, Multidisciplinary SC Physics GA 296RD UT WOS:000086038800007 ER PT J AU Gang, O Ellmann, J Moller, M Kraack, H Sirota, EB Ocko, BM Deutsch, M AF Gang, O Ellmann, J Moller, M Kraack, H Sirota, EB Ocko, BM Deutsch, M TI Surface phases of semi-fluorinated alkane melts SO EUROPHYSICS LETTERS LA English DT Article ID LIQUID NORMAL-ALKANES; X-RAY REFLECTIVITY; CHAIN MOLECULES; CRYSTALLIZATION; TRANSITION; FLUIDS AB An ordered monolayer is found to form at the free surface of semi-fluorinated alkane melts, F(CF2)(12)(CH2)(n)H, a few degrees above the bulk freezing point. X-ray and surface tension measurements show the monolayer to assume one of two different structures, depending on n. For n similar to 10 the structure is fully crystalline, while for n similar to 18 it has only short-range in-plane order. This can be assigned to packing frustration of the different diameter F and H blocks, for chain lengths where their respective intermolecular interactions become comparable. C1 Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel. Univ Ulm, D-89069 Ulm, Germany. Exxon Res & Engn Co, Annandale, NJ 08801 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Gang, O (reprint author), Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel. RI Sirota, Eric/A-7633-2009; Moller, Martin/F-7860-2015 OI Moller, Martin/0000-0002-5955-4185 NR 21 TC 33 Z9 33 U1 0 U2 4 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAR PY 2000 VL 49 IS 6 BP 761 EP 767 DI 10.1209/epl/i2000-00216-4 PG 7 WC Physics, Multidisciplinary SC Physics GA 296RD UT WOS:000086038800011 ER PT J AU Abrikosov, AA AF Abrikosov, AA TI Quantum linear magnetoresistance SO EUROPHYSICS LETTERS LA English DT Article AB A description is presented of experimental results, old and new ones, in which a magnetoresistance was discovered, linear in magnetic field. It is explained that there are two theoretical possibilities for such a phenomenon. The first one happens in a polycrystalline metal in a classically large field; it was known since the late 1950s. The other one is the so-called "quantum magnetoresistance" in semimetals and in some single crystalline metals having small pockets of the Fermi surface with a small effective mass. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Abrikosov, AA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RI li, yuan/B-4627-2011 NR 10 TC 126 Z9 126 U1 6 U2 53 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAR PY 2000 VL 49 IS 6 BP 789 EP 793 DI 10.1209/epl/i2000-00220-2 PG 5 WC Physics, Multidisciplinary SC Physics GA 296RD UT WOS:000086038800015 ER PT J AU Concus, P Finn, R Weislogel, M AF Concus, P Finn, R Weislogel, M TI Measurement of critical contact angle in a microgravity space experiment SO EXPERIMENTS IN FLUIDS LA English DT Article AB Mathematical theory predicts that small changes in container shape or in contact angle can give rise to large shifts of liquid in a microgravity environment. This phenomenon was investigated in the Interface Configuration Experiment on board the NASA USML-2 Space Shuttle flight. The experiment's "double proboscis" containers were designed to strike a balance between conflicting requirements of sizable volume of liquid shift (for ease of observation) and abruptness of the shift (for accurate determination of critical contact angle). The experimental results support the classical concept of macroscopic contact angle and demonstrate the role of hysteresis in impeding orientation toward equilibrium. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Math, Berkeley, CA 94720 USA. Stanford Univ, Dept Math, Stanford, CA 94305 USA. NASA, Lewis Res Ctr, Cleveland, OH 44135 USA. RP Concus, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 15 TC 18 Z9 19 U1 1 U2 11 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD MAR PY 2000 VL 28 IS 3 BP 197 EP 205 DI 10.1007/s003480050379 PG 9 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA 304HG UT WOS:000086477200001 ER PT J AU Creutz, M AF Creutz, M TI Transfer matrices and lattice fermions at finite density SO FOUNDATIONS OF PHYSICS LA English DT Article ID GAUGE AB I discuss the connection between the hamiltonian and path integral approaches for fermionic fields. I show how the temporal Wilson projection operators appear naturally in a lattice action. I also carefully treat the insertion of a chemical potential term. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Creutz, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 14 TC 13 Z9 13 U1 0 U2 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0015-9018 J9 FOUND PHYS JI Found. Phys. PD MAR PY 2000 VL 30 IS 3 BP 487 EP 492 DI 10.1023/A:1003630124933 PG 6 WC Physics, Multidisciplinary SC Physics GA 341KC UT WOS:000088588700011 ER PT J AU Gustin, MS Lindberg, SE AF Gustin, MS Lindberg, SE TI Assessing the contribution of natural sources to the global mercury cycle: The importance of intercomparing dynamic flux measurements SO FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY LA English DT Article; Proceedings Paper CT 5th International Conference on Mercury as a Global Pollutant CY MAY 23-28, 1999 CL RIO JANEIRO, BRAZIL SP Ctr Miner Technol, Canadian Int Dev Agcy, Brazilian Res Council, Elect Power Res Inst, Res Support Fdn ID LEVEL ENVIRONMENTAL-SAMPLES; ELEMENTAL MERCURY; SOIL; CHAMBER; TESTS; VAPOR; AIR; DISTILLATION; EMISSIONS; SURFACES AB In order to constrain the contribution of natural sources of mercury to the global atmospheric cycle we need to: 1. assess the methods used to measure mercury flux, 2. characterize those factors most important in controlling emissions, 3. develop a database of emissions from representative locations, and 4. develop a means of scaling up measured emissions to estimate fluxes on a regional basis. This paper describes how an international multi-collaborator project, the Nevada SToRMS Project, held September 1997 in Reno, Nevada, USA, contributed to our ability to constrain natural source mercury emissions. This study entailed a field intercomparison of those methods typically applied to measure mercury flux from substrate combined with evening workshops and roundtable discussions. The project was unique in that it focused on assessing our ability to measure the flux of an environmental contaminant. This is more difficult than measurement of the concentration of a contaminant because of the number and nature of the variables which influence the field flux measurements, including experimental design, spatial heterogeneity, and temporally changing environmental conditions. As a result of the Nevada SToRMS Project, rapid and significant advances in our understanding of how to constrain emission fluxes from large areas of mercury enrichment were realized. Because this intercomparison was a multi-investigator project, the results and implications of the project have been broadly circulated. The sincere scientific collaboration that evolved amongst those working on the study has led to significant advancements in our understanding of the fate and transport of mercury in the environment. C1 Univ Nevada, Dept Environm & Resource Sci, Reno, NV 89557 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Gustin, MS (reprint author), Univ Nevada, Dept Environm & Resource Sci, Reno, NV 89557 USA. RI Mason, Robert/A-6829-2011 NR 43 TC 28 Z9 28 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0937-0633 J9 FRESEN J ANAL CHEM JI Fresenius J. Anal. Chem. PD MAR PY 2000 VL 366 IS 5 BP 417 EP 422 DI 10.1007/s002160050085 PG 6 WC Chemistry, Analytical SC Chemistry GA 300TA UT WOS:000086267200002 PM 11220331 ER PT J AU Vo-Dinh, T Cullum, B AF Vo-Dinh, T Cullum, B TI Biosensors and biochips: advances in biological and medical diagnostics SO FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY LA English DT Review ID SURFACE-PLASMON RESONANCE; CARBON-PASTE ELECTRODE; MOLECULARLY IMPRINTED POLYMERS; QUARTZ-CRYSTAL MICROBALANCE; POLYPHENOL OXIDASE SYSTEM; SELF-ASSEMBLED MONOLAYERS; GLUCOSE BIOSENSOR; AMPEROMETRIC BIOSENSOR; OPTICAL BIOSENSOR; MONOCLONAL-ANTIBODY AB In the past two decades, the biological and medical fields have seen great advances in the development of biosensors and biochips capable of characterizing and quantifying biomolecules. This review is meant to provide an overview of the various types of biosensors and biochips that have been developed for biological and medical applications, along with significant advances over the last several years in these technologies. It also attempts to describe various classification schemes that can be used for categorizing the different biosensors and provide relevant examples of these classification schemes from recent literature. C1 Oak Ridge Natl Lab, Adv Monitoring Dev Grp, Oak Ridge, TN 37831 USA. RP Vo-Dinh, T (reprint author), Oak Ridge Natl Lab, Adv Monitoring Dev Grp, Bethel Valley Rd,MS-6101,POB 2008, Oak Ridge, TN 37831 USA. NR 176 TC 234 Z9 240 U1 6 U2 85 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0937-0633 J9 FRESEN J ANAL CHEM JI Fresenius J. Anal. Chem. PD MAR-APR PY 2000 VL 366 IS 6-7 BP 540 EP 551 DI 10.1007/s002160051549 PG 12 WC Chemistry, Analytical SC Chemistry GA 307PG UT WOS:000086661300004 PM 11225766 ER PT J AU Lee, B Hill, D Im, KH Sevier, L Han, JH Braams, BJ AF Lee, B Hill, D Im, KH Sevier, L Han, JH Braams, BJ TI Design of the KSTAR divertor SO FUSION TECHNOLOGY LA English DT Article DE KSTAR; divertor plate heat flux; particle control PFC material ID TOKAMAK; PLASMAS AB The planned Korea Superconducting Tokamak Advanced Research (KSTAR) divertor has been designed to provide reliable power handling and particle control with enough shaping flexibility to accommodate a wide range of plasma operation. The physics basis for the current configuration of the KSTAR divertor through analyses of the heat flux at the target, particle control, and plasma-facing component is reported. A simple zero-dimensional model based on the power balance assumptions and two-dimensional codes is utilized to estimate the heat flux to the divertor plate. The limit for the peak heat flux on the divertor plate, 3.5 MW/m(2), requires advanced operating modes such as the radiative divertor and radiative mantle, which are considered to overcome the weakness of a high-recycling divertor. A simple particle balance model could estimate the pumping rate with total leakage fraction assuming particle sources, A Monte Carlo neutral transport calculation determines the dimension of a gap between the center and outer divertor targets. Tf also determines the number and best position of the pumps, as well as the geometry for conductance. For the initial 20-s discharges, a bolted-tile carbon-fiber-composite design is relied upon for the upper and lower divertor targets. The design of the supporting structure for the diverters will allow for future modifications to accommodate thermal steady-state 300-s operation or to optimize divertor performance based on new understanding gained during initial tokamak operation. C1 Korea Basic Sci Inst, Taejon 305333, South Korea. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Korea Basic Sci Inst, Taejon 305333, South Korea. Gen Atom Co, San Diego, CA 92186 USA. NYU, Courant Inst Math Sci, New York, NY 10012 USA. RP Lee, B (reprint author), Korea Basic Sci Inst, 52 Yeoeun Dong, Taejon 305333, South Korea. EM bjlee@kstar.kbsi.re.kr RI Braams, Bastiaan/E-7687-2011 OI Braams, Bastiaan/0000-0003-4086-9969 NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 2000 VL 37 IS 2 BP 110 EP 123 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 285DF UT WOS:000085373600002 ER PT J AU Jorgensen, BS Dye, RC Pratt, LR Gomez, MA Meadows, JE AF Jorgensen, BS Dye, RC Pratt, LR Gomez, MA Meadows, JE TI Concentrating low-level tritiated water through isotope exchange SO FUSION TECHNOLOGY LA English DT Article DE tritium concentration; isotope exchange; tritiated water ID POLYBENZIMIDAZOLE; BLENDS AB Trapping of tritium on polymers with specific functional groups was investigated as a means of treating waste streams containing low levels of tritium. Chemical exchange of tritium with hydrogen on the functional group was used as the mechanism for trapping. The polymers tested include Aurorez polybenzimidazole resin bends, Chelex 100 resin beans, Duolite GT-73, microcrystalline cellulose, ann polyethylenimine. The tests were performed under simulated operating conditions on water obtained fi om the Radioactive Liquid Waste Treatment Facility at Los Alamos National Laboratory. Tritiated water front the Tritium Systems Test Assembly is discharge to this plant. Polyethylenimine is a water- soluble polymer that was tested using a stirred membrane cell with art ultrafiltration membrane. All of the polymers except polyethylenimine took up tritium from the water. Polybenzimidazole demonstrated the highest tritium uptake. The results are explained on the basis of the type of functional group, hydrogen bonding, and rigidity of the molecular structure of the polymer. The theoretical calculations indicate that significant isotope discrimination requires high-frequency modes with hydrogen bonding contribution and support the experimental findings. Modeling suggested trends that may lean to structures that are more efficient in trapping tritium. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Vassar Coll, Dept Chem, Poughkeepsie, NY 12601 USA. Univ Calif Los Alamos Natl Lab, Environm Management Program, Los Alamos, NM 87545 USA. RP Jorgensen, BS (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS E549, Los Alamos, NM 87545 USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 14 TC 3 Z9 3 U1 0 U2 7 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 USA SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 2000 VL 37 IS 2 BP 124 EP 130 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 285DF UT WOS:000085373600003 ER PT J AU Tierney, B Johnston, W Lee, J Thompson, M AF Tierney, B Johnston, W Lee, J Thompson, M TI A data intensive distributed computing architecture for "Grid" applications SO FUTURE GENERATION COMPUTER SYSTEMS LA English DT Article DE distributed computing; computational grid; distributed parallel storage AB Modern scientific computing involves organizing, moving, visualizing, and analyzing massive amounts of data from around the world, as well as employing large-scale computation. The distributed systems that solve large-scale problems will always involve aggregating and scheduling many resources. Data must be located and staged, cache and network capacity must be available at the same time as computing capacity, etc. Every aspect of such a system is dynamic: locating and scheduling resources, adapting running application systems to availability and congestion in the middleware and infrastructure, responding to human interaction, etc. The technologies, the middleware services, and the architectures that are used to build useful high-speed, wide area distributed systems, constitute the field of data intensive computing. This paper explores some of the history and future directions of that field, and describes some specific application examples. Published by Elsevier Science B.V. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Future Technol Grp, Berkeley, CA 94720 USA. RP Tierney, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Future Technol Grp, 50B-2239,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 13 TC 19 Z9 19 U1 0 U2 1 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 MAR PY 2000 VL 16 IS 5 BP 473 EP 481 DI 10.1016/S0167-739X(99)00142-9 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA 291DU UT WOS:000085719500006 ER PT J AU Alvarez, JD Yasui, DH Niida, H Joh, T Loh, DY Kohwi-Shigematsu, T AF Alvarez, JD Yasui, DH Niida, H Joh, T Loh, DY Kohwi-Shigematsu, T TI The MAR-binding protein SATB1 orchestrates temporal and spatial expression of multiple genes during T-cell development SO GENES & DEVELOPMENT LA English DT Article DE SATB1; MARs; chromatin structure; gene expression; T-cell development ID MATRIX-ATTACHMENT REGION; CHROMOSOMAL LOOP ANCHORAGE; NUCLEAR MATRIX; INTERLEUKIN-2 RECEPTORS; TYROSINE KINASES; DEATH DOMAIN; ALPHA-BETA; IN-VIVO; DNA; MICE AB SATB1 is expressed primarily in thymocytes and can act as a transcriptional repressor. SATB1 binds in vivo to the matrix attachment regions (MARs) of DNA, which are implicated in the loop domain organization of chromatin. The role of MAR-binding proteins in specific cell lineages is unknown. We generated SATB1-null mice to determine how SATB1 functions in the T-cell lineage. SATB1-null mice are small in size, have disproportionately small thymi and spleens, and die at 3 weeks of age. At the cellular level, multiple defects in T-cell development were observed. Immature CD3(-)CD4(-)CD8(-) triple negative (TN) thymocytes were greatly reduced in number, and thymocyte development was blocked mainly at the DP stage. The few peripheral CD4(+) single positive (SP) cells underwent apoptosis and failed to proliferate in response to activating stimuli. At the molecular level, among 589 genes examined, at least 2% of genes including a proto-oncogene, cytokine receptor genes, and apoptosis-related genes were derepressed at inappropriate stages of T-cell development in SATB1-null mice. For example, IL-2R alpha and IL-7R alpha genes were ectopically transcribed in CD4(+)CD8(+) double positive (DP) thymocytes. SATB1 appears to orchestrate the temporal and spatial expression of genes during T-cell development, thereby ensuring the proper development of this lineage. Our data provide the first evidence that MAR-binding proteins can act as global regulators of cell function in specific cell lineages. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. Nippon Roche Res Ctr, Kamakura, Kanagawa 247, Japan. RP Kohwi-Shigematsu, T (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. FU NCI NIH HHS [R01CA39681, R01 CA039681] NR 67 TC 228 Z9 246 U1 0 U2 4 PU COLD SPRING HARBOR LAB PRESS PI PLAINVIEW PA 1 BUNGTOWN RD, PLAINVIEW, NY 11724 USA SN 0890-9369 J9 GENE DEV JI Genes Dev. PD MAR 1 PY 2000 VL 14 IS 5 BP 521 EP 535 PG 15 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA 294YG UT WOS:000085938000002 PM 10716941 ER PT J AU Luo, SD Ku, TL Roback, R Murrell, M McLing, TL AF Luo, SD Ku, TL Roback, R Murrell, M McLing, TL TI In-situ radionuclide transport and preferential groundwater flows at INEEL (Idaho): Decay-series disequilibrium studies SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID U-234/U-238 ACTIVITY RATIOS; YELLOWSTONE-NATIONAL-PARK; STATES GULF-COAST; RADIUM ISOTOPES; NATURAL ANALOG; URANIUM; WATER; RETARDATION; GEOCHEMISTRY; TH-232 AB Uranium and thorium-decay series disequilibria in groundwater occur as a result of water-rock interactions, and they provide site-specific, natural analog information for assessment of in-situ, long-term migration of radionuclides in the far field of a nuclear waste disposal site. In this study, a mass balance model was used to relate the decay-series radionuclide distributions among solution, sorbed and solid phases in an aquifer system to processes of water transport, sorption-desorption, dissolution-precipitation, radioactive ingrowth-decay, and alpha recoil. Isotopes of U (U-238, U-234), Th (Th-232, Th-230, Th-228, Th-234), Ra (Ra-226, Ra-228, Ra-224), and Rn (Rn-222) were measured in 23 groundwater samples collected from a basaltic aquifer at the Idaho National Engineering and Environmental Laboratory (INEEL), Idaho. The results show that groundwater activities of Th and Ra isotopes are 2-4 orders lower than those of their U progenitors which average 1.35 +/- 0.40 dpm U-238/L, with U-234/U-238 ratios of similar to 1.6-3.0. Rn-222 activities range from 20 to 500 dpm/L. Modeling of the observed disequilibria places the following constraints on the time scale of radionuclide migration and water-rock interaction at INEEL: (1) Time for sorption is minutes for Ra and Th; time for desorption is days for Ra and years for Th; and time for precipitation is days for Th, years for Ra, and centuries for U. (2) Retardation factors due to sorption average >10(6) for Th-232, similar to 10(4) for Ra-226, and similar to 10(3) for U-238. (3) Dissolution rates of rocks are similar to 70 to 800 mg/L/y. (4) Ages of groundwater range from <10 to 100 years. Contours of groundwater age, as well as spatial patterns of radionuclide disequilibria, delineate two north-south preferential flow pathways and two stagnated locales. Relatively high rates of dissolution and precipitation and alpha-recoil of Rn-222 occur near the groundwater recharging sites as well as in the major flow pathways. Decay of the sorbed parent radionuclides (e.g., Ra-266 and Ra-228) on micro-fracture surfaces constitutes an important source of their daughter (Rn-222 and Th-228) activities in groundwater. Copyright (C) 2000 Elsevier Science Ltd. C1 Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Luo, SD (reprint author), Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA. NR 70 TC 58 Z9 60 U1 3 U2 22 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 5 BP 867 EP 881 DI 10.1016/S0016-7037(99)00373-7 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 289NZ UT WOS:000085630000008 ER PT J AU Cole, DR AF Cole, DR TI Isotopic exchange in mineral-fluid systems. IV. The crystal chemical controls on oxygen isotope exchange rates in carbonate-H2O and layer silicate-H2O systems SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID ELEVATED-TEMPERATURES; DISSOLUTION RATES; WATER FUGACITY; DIFFUSION; QUARTZ; KINETICS; HYDROGEN; EQUILIBRATION; 350-DEGREES-C; FRACTIONATION AB Oxygen isotope exchange between minerals and water in systems far from chemical equilibrium is controlled largely by surface reactions such as dissolution-precipitation. In many cases, this behavior can be modeled adequately by a simple pseudo-first order rate model that accounts for changes in surface area of the solid. Previous modeling of high temperature isotope exchange data for carbonates, sulfates, and silicates indicated that within a given mineral group there appears to be a systematic relationship between rate and mineral chemistry. We tested this idea by conducting oxygen isotope exchange experiments in the systems, carbonate-H2O and layer silicate-H2O at 300 and 350 degrees C, respectively. Witherite (BaCO3), strontianite (SrCO3) and calcite (CaCO3) were reacted with pure H2O for different lengths of time (271-1390 h) at 300 degrees C and 100 bars. The layer silicates, chlorite, biotite and muscovite were reacted with H2O for durations ranging from 132 to 3282 h at 350 degrees C and 250 bars. A detailed survey of grain sizes and grain habits using scanning electron microscopy (SEM) indicated that grain regrowth occurred in all experiments to varying extents. Changes in the mean grain diameters were particularly significant in experiments involving withertite, strontianite and biotite. The variations in the extent of oxygen isotope exchange were measured as a function of time, and fit to a pseudo-first order rate model that accounted for the change in surface area of the solid during reaction. The isotopic rates (ln r) for the carbonate-H2O system are -20.75 +/- 0.44, -18.95 +/- 0.62 and -18.51 +/- 0.48 mol O m(-2) s(-1) for calcite, strontianite and witherite, respectively. The oxygen isotope exchange rates for layer silicate-H2O systems are -23.99 +/- 0.89, -23.14 +/- 0.74 and -22.40 +/- 0.66 mol O m(-2) s(-1) for muscovite, biotite and chlorite, respectively. The rates for the carbonate-H2O systems increase in order from calcite to strontianite to witherite. This order clearly reflects the influence of the change in cation chemistry, i.e., Ba > Sr > Ca. A similar pattern is observed for the layer silicate-H2O systems, where chlorite>biotite>muscovite. The link between cation chemistry and rate is more complicated in this case, but in general, the order follows a trend where Mg-Fe > K-Mg > K, with an associated increase in Si and Al, and decrease in hydroxyl. The isotopic-chemical relations suggest that oxygen isotope exchange behavior monitored experimentally in this study is the net result of bond-breaking and dissolution of the mineral, complex ion formation in solution and growth of the mineral, whose structure is controlled, in large part, by the lattice energy. We compared the rates against the electrostatic attractive lattice energies (neglecting the repulsive forces), normalized per number of cations. The correlations between rates and lattice energies are quite good for both mineral-H2O systems. The increase in rates correlated with a decrease in the electrostatic attractive lattice energies, i.e., the greater the lattice energy required to break up the crystal, the more sluggish the rates for both chemical and isotopic exchange. By establishing an unambiguous relationship between rate, lattice energy, and ultimately temperature, we can begin to develop empirical equations useful in predicting rates of isotopic exchange for minerals for which experimental data are lacking. Copyright (C) 2000 Elsevier Science Ltd. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Cole, DR (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 47 TC 14 Z9 15 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 5 BP 921 EP 931 DI 10.1016/S0016-7037(99)00357-9 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 289NZ UT WOS:000085630000012 ER PT J AU Gauthier, PJ Condomines, M Hammouda, T AF Gauthier, PJ Condomines, M Hammouda, T TI An experimental investigation of radon diffusion in an anhydrous andesitic melt at atmospheric pressure: Implications for radon degassing from erupting magmas (vol 63, pg 645, 1999) SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Correction C1 Univ Blaise Pascal, OPGC & Ctr Rech Volcanol, CNRS, UMR 6524,5 Rue Kessler, F-63038 Clermont Ferrand, France. RP Gauthier, PJ (reprint author), Univ Calif Los Alamos Natl Lab, Grp EES1, MS S462, Los Alamos, NM 87545 USA. NR 2 TC 2 Z9 2 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 5 BP 959 EP 960 DI 10.1016/S0016-7037(99)00362-2 PG 2 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 289NZ UT WOS:000085630000015 ER PT J AU Heikoop, JM Dunn, JJ Risk, MJ Schwarcz, HP McConnaughey, TA Sandeman, IM AF Heikoop, JM Dunn, JJ Risk, MJ Schwarcz, HP McConnaughey, TA Sandeman, IM TI Separation of kinetic and metabolic isotope effects in carbon-13 records preserved in reef coral skeletons SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID DEEP-SEA CORAL; SCLERACTINIAN CORALS; MONTASTREA-ANNULARIS; STABLE ISOTOPES; BIOLOGICAL CARBONATES; SEASONAL-VARIATION; EXTENSION RATE; OXYGEN; FRACTIONATION; C-13 AB The stable isotopic signatures of Jamaica and Zanzibar coral skeletons, collected over depth and light gradients, are strongly affected by kinetic isotope effects associated with the calcification process. These kinetic effects mask delta(13)C metabolic signals of Light availability/photosynthesis. A simple data transformation, based on oxygen isotopic variation in the skeleton, has been developed to correct for the presence of these disequilibrium kinetic influences. The resulting transformed skeletal delta(13)C data show significant correlation with associated tissue delta(13)C and with depth/light attenuation. These relationships demonstrate the value of the transformation and suggest that transformed skeletal delta(13)C data faithfully record the carbon isotope effect associated with photosynthesis, in which increased photosynthesis leads to skeleton enriched in the heavy isotope of carbon. Possible applications of these transformations include improved modeling of carbon fluxes in corals and more accurate reconstruction of insolation, depth, water clarity and cloudiness. The C-13 transformation presented will also allow for better identification of periods of metabolic stress in corals, when growth rate effects on delta(13)C might normally obscure the C-13 metabolic signal. Copyright (C) 2000 Elsevier Science. C1 McMaster Univ, Sch Geog & Geol, Hamilton, ON L8S 4M1, Canada. Trent Univ, Dept Biol, Peterborough, ON K9J 7B8, Canada. RP LANL, MS-D462,EES-1, Los Alamos, NM 87545 USA. EM jheikoop@lanl.gov RI Heikoop, Jeffrey/C-1163-2011 NR 68 TC 55 Z9 56 U1 0 U2 14 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 6 BP 975 EP 987 DI 10.1016/S0016-7037(99)00363-4 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 294AV UT WOS:000085888500002 ER PT J AU Hilyard, M Nielsen, RL Beard, JS Patino-Douce, A Blencoe, J AF Hilyard, M Nielsen, RL Beard, JS Patino-Douce, A Blencoe, J TI Experimental determination of the partitioning behavior of rare earth and high field strength elements between pargasitic amphibole and natural silicate melts SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID MOUNT-ST-HELENS; DISTRIBUTION COEFFICIENTS; PLAGIOCLASE FELDSPAR; BASALTIC LIQUIDS; ORTHO-PYROXENE; HIGH-PRESSURE; ISLAND-ARC; 20 KBAR; CLINOPYROXENE; OLIVINE AB The primary goal of this investigation was to derive a set of expressions that can be used to calculate the amphibole-melt partitioning behavior of the rare earth elements (REE) and the high field strength elements (HFSE) in natural systems. To supplement the existing data set on basaltic systems, we conducted experiments on systems where amphibole was in equilibrium with dacitic, tonalitic and low Si rhyolitic melts. These experiments, doped with La, Sm, Gd, Lu, Ta, Nb, Y, Zr, and Hf, were run at pressures of 2 and 5 kbar, temperatures between 900 degrees C and 945 degrees C, and oxidation conditions ranging from QFM-1 to NiNiO+1. The partitioning data obtained in this study were combined with published data to calculate two sets of expressions describing trace element partitioning. The first set models the partitioning of trace elements into amphibole using temperature, pressure and several compositional parameters, including the compositionally-compensated partition coefficients of Ti, Al, Caand SiO2, and the exchange of Fe and Mg between the crystal and the melt (D-Mg/D-Fe). The second set of expressions are slightly less precise, but require no specific knowledge of P, T, or f(O2) and, for application to natural systems, can be constructed solely on the basis of information available from standard electron microprobe analyses. These expressions predict amphibole-melt partition coefficients for REE and HFSE within an internal precision of 14-40% (relative) for alkali basalt to low Si rhyolite, from 850 degrees C to 1100 degrees C, 2-20 kbar and oxygen fugacity from QFM-1 to NiNiO+1. Partition coefficients calculated from the expressions derived in this study were used to model the partial melting and fractional crystallization of a hypothetical amphibolite and hydrous melt, respectively. Fractionation and/or melting in amphibole-bearing systems produces a magma with a convex upward REE pattern, a characteristic common to many hornblende-bearing dacites. However, the removal or addition of an amphibole component cannot produce the strong HFSE depletion relative to the REE observed in many are magmas. Copyright (C) 2000 Elsevier Science Ltd. C1 Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA. Virginia Museum Na Hist, Martinsville, VA 24112 USA. Univ Georgia, Dept Geol, Athens, GA 30602 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Nielsen, RL (reprint author), Oregon State Univ, Dept Geosci, 104 Wilkinson Hall, Corvallis, OR 97331 USA. NR 87 TC 34 Z9 36 U1 0 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 6 BP 1103 EP 1120 DI 10.1016/S0016-7037(99)00379-8 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 294AV UT WOS:000085888500013 ER PT J AU Greenwood, JP Riciputi, LR McSween, HY Taylor, LA AF Greenwood, JP Riciputi, LR McSween, HY Taylor, LA TI Modified sulfur isotopic compositions of sulfides in the nakhlites and Chassigny SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID CHEMICAL-COMPOSITION; ORDINARY CHONDRITES; ION MICROPROBE; MARTIAN SOIL; METEORITE; MINERALS; MARS; RATIOS; PETROGENESIS; SYSTEMATICS AB Variable sulfur isotopic ratios of sulfide minerals in the nakhlites and Chassigny have been measured by ion microprobe. The ranges and means of delta(34)S values of pyrrhotite and pyrite in nakhlites become more negative in the sequence Nakhla (delta(34)S: -1.7 to +4.9 parts per thousand; mean delta(34)S = +1.5 +/- 2.0 parts per thousand) > Governador Valadares (delta(34)S: -2.4 to +3.8 parts per thousand; mean delta(34)S = +0.7 +/- 2.4 parts per thousand) > Lafayette (-6.1 to +0.1 parts per thousand; mean delta(34)S = -3.2 +/- 2.1 parts per thousand). This is also the sequence of increasing degrees of subsolidus re-equilibration, suggesting that S-32 enrichment may be related to the subsolidus thermal history. A chalcopyrite vein cross cutting a pyrrhotite in Nakhla, coupled with chalcopyrite having slightly lighter delta(34)S values, suggests that subsolidus fluids may have become isotopically lighter (with respect to sulfur) in Nakhla with time. Pyrite has replaced pyrrhotite in Lafayette, suggesting that fO(2) and/or fS(2) increased after pyrrhotite crystallization. A model involving subsolidus hydrothermal modification of igneous sulfide minerals (with delta(34)S similar to 0 parts per thousand) due to late-stage oxidation of fluids provides a reasonable explanation for the sulfur isotopic systematics of the nakhlites and Chassigny. Sulfur isotopic alteration is believed to have occurred during the waning stages of nakhlite magmatism, rather than during a much later low-temperature (<100 degrees C) iddingsite formation event, based on the ineffectiveness of abiogenic sulfur isotopic fractionation below 200 degrees C. Variable mixing of two isotopically different fluids also could have produced the observed fractionations, although an isotopically light reservoir of sulfur is problematic. Other possible mechanisms evaluated to explain the sulfur isotopic values of the sulfide minerals include martian mantle heterogeneity, possible influence of martian biological processes, and magmatic degassing of SO2. Copyright (C) 2000 Elsevier Science Ltd. C1 Univ Tennessee, Dept Geol Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Chem & Analyt Sci Div, Oak Ridge, TN 37831 USA. RP Greenwood, JP (reprint author), Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA. NR 49 TC 27 Z9 27 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD MAR PY 2000 VL 64 IS 6 BP 1121 EP 1131 DI 10.1016/S0016-7037(99)00350-6 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 294AV UT WOS:000085888500014 ER PT J AU Huang, LJ Fehler, MC AF Huang, LJ Fehler, MC TI Quasi-Born Fourier migration SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE Born approximation; Fourier transforms; imaging; P waves; quasi-Born approximation; seismic migration ID GEOPHYSICAL DIFFRACTION TOMOGRAPHY; PRESTACK DEPTH MIGRATION; REVERSE-TIME MIGRATION; KIRCHHOFF MIGRATION; DIFFERENCE; APPROXIMATION; DISPERSION AB The Born approximation of the Lippman-Schwinger equation has recently been used to implement a recursive method for seismic migration of pressure wavefields. This Born-based method is stable only when the scattering from heterogeneities within an extrapolation depth interval is weak. To handle strong scattering accurately and efficiently, we propose a quasi-Born approximation of the Lippman-Schwinger equation to extrapolate pressure wavefields downwards recursively. We assume that the scattered wavefield is linearly related to the incident wavefield by a scalar function that varies slowly with lateral position within an extrapolation depth interval. The extrapolation is implemented as a dual-domain procedure in the frequency-space and frequency-wavenumber domains. Fast Fourier transforms are used to transform data between these two domains. The quasi-Born-based depth-migration algorithm is termed the quasi-Born Fourier method. It can efficiently produce good-quality images of complex structures with strong lateral perturbations of slowness. It is stable for strong scattering and can accurately handle scattering and wave propagation along directions at large angles from the main propagation direction. Image quality obtained using the new method is similar to that of a dual-domain migration method that uses the Rytov approximation within each extrapolation depth interval, but the computational speed of the new method is approximately 27 per cent faster than the latter method for pre-stack migration of an industry standard data set-the Marmousi data set. Compared to the Born-based migration method, the quasi-Born Fourier method is slightly less efficient because it requires an additional multiplication and an additional division for each lateral gridpoint in each step of wavefield extrapolation. For weak scattering, the quasi-Born Fourier method converges to the Born-based method. To improve the efficiency of the quasi-Born Fourier method further without losing its accuracy, we propose a hybrid Born/quasi-Born Fourier method in which the Born-based method is used when the scattering within an extrapolation depth interval is weak, and the quasi-Born Fourier method is used for other cases. This hybrid method is approximately 32 per cent faster than the Rytov-based method for the pre-stack depth migration of the Marmousi data set, while the images obtained using both methods have almost the same quality. C1 Univ Calif Los Alamos Natl Lab, EES Div, Los Alamos Seism Res Ctr, Los Alamos, NM 87545 USA. RP Huang, LJ (reprint author), Univ Calif Los Alamos Natl Lab, EES Div, Los Alamos Seism Res Ctr, Mail Stop D443, Los Alamos, NM 87545 USA. NR 40 TC 10 Z9 14 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD MAR PY 2000 VL 140 IS 3 BP 521 EP 534 DI 10.1046/j.1365-246X.2000.00044.x PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 286RT UT WOS:000085459900006 ER PT J AU Chi, PJ Russell, CT Musman, S Peterson, WK Le, G Angelopoulos, V Reeves, GD Moldwin, MB Chun, FK AF Chi, PJ Russell, CT Musman, S Peterson, WK Le, G Angelopoulos, V Reeves, GD Moldwin, MB Chun, FK TI Plasmaspheric depletion and refilling associated with the September 25, 1998 magnetic storm observed by ground magnetometers at L=2 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID FIELD LINES; RESONANCE; DENSITY AB The plasmaspheric mass density at L similar or equal to 2 was monitored by two IGPP/LANL ground magnetometer stations during the magnetic storm on September 25, 1998. Even at this low latitude the plasma density dropped significantly to similar or equal to 1/4 of the pre-storm value. The total electron content (TEC) inferred by GPS signals also shows a sizable decrease during the storm. The observations suggest that the convection caused by the strong electric field associated with the magnetic storm eroded the plasmasphere as low as L = 2, which is a much lower latitude than that expected from the estimated potential drop across the polar cap together with a simple model of the magnetospheric convection pattern. C1 Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA. NOAA, Geosci Res Div, Silver Spring, MD 20910 USA. Lockheed Martin Space Sci Lab, Dept H111, Palo Alto, CA 94304 USA. Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA. USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA. RP Chi, PJ (reprint author), Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA. RI Moldwin, Mark/F-8785-2011; Le, Guan/C-9524-2012; Peterson, WK/A-8706-2009; Reeves, Geoffrey/E-8101-2011; OI Moldwin, Mark/0000-0003-0954-1770; Le, Guan/0000-0002-9504-5214; Peterson, WK/0000-0002-1513-6096; Reeves, Geoffrey/0000-0002-7985-8098; Russell, Christopher/0000-0003-1639-8298 NR 14 TC 44 Z9 45 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAR 1 PY 2000 VL 27 IS 5 BP 633 EP 636 DI 10.1029/1999GL010722 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 288YJ UT WOS:000085591800013 ER PT J AU Armstrong, RA Suszcynsky, DM Lyons, WA Nelson, TE AF Armstrong, RA Suszcynsky, DM Lyons, WA Nelson, TE TI Multi-color photometric measurements of ionization and energies in sprites SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID NM AB Recent time-resolved multi-color photometric data obtained on one class of lightning-related transient upper-atmospheric electromagnetic events called sprites have confirmed an impulsive ionization emission during the sprite initiation. Data have also been obtained on some sprites which do not exhibit observable tendrils and which exhibit ionization emission that, if present, is below our detection limit. This suggests that some sprite events exhibit strong ionization while others do not. These results indicate that conditions causing sprite optical emissions are highly variable. C1 Mission Res Corp, Nashua, NH 03062 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. FMA Res, Ft Collins, CO 80524 USA. RP Armstrong, RA (reprint author), Mission Res Corp, Nashua, NH 03246 USA. NR 16 TC 39 Z9 39 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAR 1 PY 2000 VL 27 IS 5 BP 653 EP 656 DI 10.1029/1999GL003672 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 288YJ UT WOS:000085591800018 ER PT J AU Romero, LA Ghiglia, DC Ober, CC Morton, SA AF Romero, LA Ghiglia, DC Ober, CC Morton, SA TI Phase encoding of shot records in prestack migration SO GEOPHYSICS LA English DT Article AB Frequency-domain shot-record migration can produce higher quality images than Kirchhoff migration but typically at a greater cost. The computing cost of shot-record migration is the product of the number of shots in the survey and the expense of each individual migration. Many attempts to reduce this cost have focused on the speed of the individual migrations, trying to achieve a better trade-off between accuracy and speed. Another approach is to reduce the number of migrations. We investigate the simultaneous migration of shot records using frequency-domain shot-record migration algorithms. The difficulty with this approach is the production of so-called crossterms between unrelated shot and receiver wavefields, which generate unwanted artifacts or noise in the final image. To reduce these artifacts and obtain an image comparable in quality to the single-shot-per-migration result, we have introduced a process called phase encoding, which shifts or disperses these crossterms. The process of phase encoding thus allows one to trade SM ratio for the speed of migrating the entire survey. Several encoding functions and two application strategies have been tested. The first strategy, combining multiple shuts per migration and using each shot only once, reduces computation in direct relation to the number of shots combined, The second strategy, performing multiple migrations of all the shots in the survey, provides a means to reduce the crossterm noise by stacking the resulting images. The additional noise in both strategies may be tolerated if it is no stronger than the inherent seismic noise in the migrated image and if the final image is achieved with less cost. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Cray Res Inc, Eagan, MN USA. RP Romero, LA (reprint author), Sandia Natl Labs, POB 5800,MS 1110, Albuquerque, NM 87185 USA. NR 14 TC 89 Z9 103 U1 0 U2 4 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 USA SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD MAR-APR PY 2000 VL 65 IS 2 BP 426 EP 436 DI 10.1190/1.1444737 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 304NR UT WOS:000086490800008 ER PT J AU Zhang, ZY Routh, PS Oldenburg, DW Alumbaugh, DL Newman, GA AF Zhang, ZY Routh, PS Oldenburg, DW Alumbaugh, DL Newman, GA TI Reconstruction of 1-D conductivity from dual-loop EM data SO GEOPHYSICS LA English DT Article ID ELECTROMAGNETIC SOUNDING DATA; FREQUENCY-DOMAIN; LAYERED EARTH; INVERSION; MULTISEPARATION; RESPONSES AB Inversions of electromagnetic data from different coil configurations provide independent information about geological structures. We develop a 1-D inversion algorithm that can invert data from the horizontal coplanar (HC), vertical coplanar, coaxial (CA), and perpendicular coil configurations separately or jointly. The inverse problem is solved by minimizing a model objective function subject to data constraints. Tests using synthetic data from 1-D models indicate that if data are collected at a sufficient number of frequencies, then the recovered models from individual inversions of different coil systems can be quite similar. However, if only a limited number of frequencies are available, then joint inversion of data from different coils produces a better model than the individual inversions. Tests on 3-D synthetic data sets indicate that 1-D inversions can be used as a fast and approximate tool to locate anomalies in the subsurface. Also for the test example presented here, the joint inversion of HC and CA data over a 3-D conductivity provided a better model than that produced by the individual inversion of the data sets. C1 Univ British Columbia, Geophys Invers Facil, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Zhang, ZY (reprint author), Baker Atlas, 10201 Westheimer,Bldg 1A, Houston, TX 77042 USA. RI Newman, Gregory/G-2813-2015 NR 21 TC 14 Z9 15 U1 0 U2 1 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 USA SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD MAR-APR PY 2000 VL 65 IS 2 BP 492 EP 501 DI 10.1190/1.1444743 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 304NR UT WOS:000086490800014 ER PT J AU Fung, IY Meyn, SK Tegen, I Doney, SC John, JG Bishop, JKB AF Fung, IY Meyn, SK Tegen, I Doney, SC John, JG Bishop, JKB TI Iron supply and demand in the upper ocean SO GLOBAL BIOGEOCHEMICAL CYCLES LA English DT Article ID EQUATORIAL PACIFIC-OCEAN; SUB-ARCTIC PACIFIC; LIMITS PHYTOPLANKTON GROWTH; WORLD OCEAN; MARINE-PHYTOPLANKTON; SURFACE SEAWATER; SOUTHERN-OCEAN; LIMITATION; CIRCULATION; NITRATE AB Iron is hypothesized to be a limiting micronutrient for ocean primary production. This paper presents an analysis of the iron budget in the upper ocean. The global distribution of annual iron assimilation by phytoplankton was estimated from distributions of satellite-derived oceanic primary production and measured (Fe:C)(cellular) ratios. The distributions of iron supply by upwelling/mixing and aeolian deposition were obtained by applying (Fe:NO3)(dissolved) ratios to the nitrate supply and by assuming the soluble fraction of mineral aerosols. A lower bound on the rate of iron recycling in the photic zone was estimated as the difference between iron assimilation and supply. Global iron assimilation by phytoplankton for The open ocean was estimated to be 12x10(9) mol Fe yr(-1). Atmospheric deposition of total Fe is estimated to be 96x10(9) mol Fe yr(-1) in the open ocean, with the soluble Fe fraction ranging between 1 and 10% (or 1-10x10(9) mol Fe yr(-1)). By comparison, the upwelling/entrainment supply of dissolved Fe to the upper ocean is small, similar to 0.7x 10(9) mol Fe yr(-1). Uncertainties in the aeolian flux and assimilation may be as large as a factor of 5-10 but remain difficult to quantify, as information is limited about the form and transformation of iron from the soil to phytoplankton incorporation. An iron stress index, relating the (Fe:N) demand to the (Fe:N) supply, confirms the production in the high-nitrate low-chlorophyll regions is indeed limited by iron availability. C1 Univ Calif Berkeley, Ctr Atmospher Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NASA, Goddard Inst Space Studies, New York, NY 10025 USA. Natl Ctr Atmospher Res, Boulder, CO 80303 USA. Univ British Columbia, Dept Geog, Vancouver, BC V6T 1Z2, Canada. Univ Victoria, Victoria, BC V8W 2Y2, Canada. RP Fung, IY (reprint author), Univ Calif Berkeley, Ctr Atmospher Sci, 307 McCone Hall 4767, Berkeley, CA 94720 USA. RI Doney, Scott/F-9247-2010; John, Jasmin/F-8194-2012 OI Doney, Scott/0000-0002-3683-2437; John, Jasmin/0000-0003-2696-277X NR 75 TC 329 Z9 336 U1 8 U2 64 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0886-6236 J9 GLOBAL BIOGEOCHEM CY JI Glob. Biogeochem. Cycle PD MAR PY 2000 VL 14 IS 1 BP 281 EP 295 DI 10.1029/1999GB900059 PG 15 WC Environmental Sciences; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences GA 292RM UT WOS:000085808900022 ER PT J AU Post, WM Kwon, KC AF Post, WM Kwon, KC TI Soil carbon sequestration and land-use change: processes and potential SO GLOBAL CHANGE BIOLOGY LA English DT Article DE carbon sequestration; land-use; reforestation; soil carbon ID CONSERVATION RESERVE PROGRAM; ORGANIC-MATTER RECOVERY; LIGHT-FRACTION; SECONDARY SUCCESSION; EASTERN AMAZONIA; GRASSLAND SOILS; TROPICAL SOILS; NITROGEN; TURNOVER; PASTURE AB When agricultural land is no longer used for cultivation and allowed to revert to natural vegetation or replanted to perennial vegetation, soil organic carbon can accumulate. This accumulation process essentially reverses some of the effects responsible for soil organic carbon losses from when the land was converted from perennial vegetation. We discuss the essential elements of what is known about soil organic matter dynamics that may result in enhanced soil carbon sequestration with changes in land-use and soil management. We review literature that reports changes in soil organic carbon after changes in land-use that favour carbon accumulation. This data summary provides a guide to approximate rates of SOC sequestration that are possible with management, and indicates the relative importance of some factors that influence the rates of organic carbon sequestration in soil. There is a large variation in the length of time for and the rate at which carbon may accumulate in soil, related to the productivity of the recovering vegetation, physical and biological conditions in the soil, and the past history of soil organic carbon inputs and physical disturbance. Maximum rates of C accumulation during the early aggrading stage of perennial vegetation growth, while substantial, are usually much less than 100 g C m(-2) y(-1.) Average rates of accumulation are similar for forest or grassland establishment: 33.8 g C m(-2) y(-1) and 33.2 g C m(-2) y(-1), respectively. These observed rates of soil organic C accumulation, when combined with the small amount of land area involved, are insufficient to account for a significant fraction of the missing C in the global carbon cycle as accumulating in the soils of formerly agricultural land. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Tuskegee Univ, Dept Chem Engn, Tuskegee, AL 36088 USA. RP Post, WM (reprint author), Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RI daorui, han/G-3767-2011; Post, Wilfred/B-8959-2012 NR 72 TC 1023 Z9 1258 U1 74 U2 582 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 1354-1013 J9 GLOB CHANGE BIOL JI Glob. Change Biol. PD MAR PY 2000 VL 6 IS 3 BP 317 EP 327 DI 10.1046/j.1365-2486.2000.00308.x PG 11 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 299KQ UT WOS:000086198100006 ER PT J AU Gunter, LE Tuskan, GA Gunderson, CA Norby, RJ AF Gunter, LE Tuskan, GA Gunderson, CA Norby, RJ TI Genetic variation and spatial structure in sugar maple (Acer saccharum Marsh.) and implications for predicted global-scale environmental change SO GLOBAL CHANGE BIOLOGY LA English DT Article DE F-st theta= fixation coefficient; H-s=mean expected heterozygosity; P-p=percentage polymorphic loci; gene flow; genetic variation; global warming; population structure; RAPDs; sugar maple ID POPULATION-GENETICS; CLIMATE-CHANGE; RAPD MARKERS; FORESTS; ADAPTATION; DISTANCE; PLANTS; CANADA; STANDS AB Current ecosystem model predictions concerning the effects of global temperature increase on forest responses do not account for factors influencing long-term evolutionary dynamics of natural populations. Population structure and genetic variability may represent important factors in a species' ability to adapt to global-scale environmental change without experiencing major alterations in current range limits. Genetic variation and structure in sugar maple (Acer saccharum Marsh.) were examined across three regions, between two stands within regions, and among four to five open-pollinated families within stands (total N = 547 genotypes) using 58 randomly amplified polymorphic DNA (RAPD) markers. Differences within open-pollinated families account for the largest portion of the total variation (29%), while differences among regions represent less than 2% of the total variation. Genetic diversity, as indicated by estimates of percent polymorphic loci, expected heterozygosity, fixation coefficients, and genetic distance, is greatest in the southern region, which consists of populations with the maximum potential risk due to climate change effects. The high level of genetic similarity (greater than 90%) among some genotypes suggests that gene flow is occurring among regions, stands, and families. High levels of genetic variation among families indicate that vegetational models designed to predict species' response to global-scale environmental change may need to consider the degree and hierarchical structure of genetic variation when making large-scale inferences. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Gunter, LE (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. RI Tuskan, Gerald/A-6225-2011; Norby, Richard/C-1773-2012; Gunter, Lee/L-3480-2016 OI Tuskan, Gerald/0000-0003-0106-1289; Norby, Richard/0000-0002-0238-9828; Gunter, Lee/0000-0003-1211-7532 NR 46 TC 14 Z9 16 U1 0 U2 16 PU BLACKWELL SCIENCE LTD PI OXFORD PA P O BOX 88, OSNEY MEAD, OXFORD OX2 0NE, OXON, ENGLAND SN 1354-1013 J9 GLOB CHANGE BIOL JI Glob. Change Biol. PD MAR PY 2000 VL 6 IS 3 BP 335 EP 344 DI 10.1046/j.1365-2486.2000.00313.x PG 10 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 299KQ UT WOS:000086198100008 ER PT J AU Hall, BL Baldwin, CK Lachmar, TE Dupont, RR AF Hall, BL Baldwin, CK Lachmar, TE Dupont, RR TI Instrumentation design and installation for monitoring air injection ground water remediation technologies SO GROUND WATER MONITORING AND REMEDIATION LA English DT Article ID CRITERIA AB An in situ instrumentation bundle was designed for inclusion in monitoring wells that were installed at the Wasatch Trailer Sales site in Layton, Utah, to evaluate in situ air sparging (IAS) and in-well aeration (IWA). Sensors for the bundle were selected based on laboratory evaluation of accuracy and precision, as well as consideration of size and cost. SenSym pressure transducers, Campbell Scientific Inc. (CSI) T-type thermocouples, and dissolved oxygen (DO) probes manufactured by Technalithics Inc. (Waco, Texas), were selected for each of the 27 saturated zone bundles. Each saturated zone bundle also included a stirring blade to mix water near the DO probe. A Figaro oxygen sensor was included in the vadose zone bundle. The monitoring wells were installed by direct push technique to minimize soil disruption and to ensure intimate contact between the 18 inch (46 cm) long screens and the soil. A data acquisition system, comprised of a CSI 21X data logger and four CSI AM416 multiplexers, was used to control the stirring blades and record signals from more than 70 in situ sensors. The instrumentation performed well during evaluation of IAS and IWA at the site. However, the SenSym pressure transducers were not adequately temperature compensated and will need to be replaced. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Utah State Univ, Utah Water Res Lab, Environm Engn Div, Logan, UT 84322 USA. Utah State Univ, Dept Geol, Logan, UT 84322 USA. RP Hall, BL (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd,POB 999, Richland, WA 99352 USA. NR 20 TC 5 Z9 5 U1 1 U2 5 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 USA SN 1069-3629 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD SPR PY 2000 VL 20 IS 2 BP 46 EP 54 DI 10.1111/j.1745-6592.2000.tb00264.x PG 9 WC Water Resources SC Water Resources GA 315RZ UT WOS:000087127900004 ER PT J AU Fruchter, JS Cole, CR Williams, MD Vermeul, VR Amonette, JE Szecsody, JE Istok, JD Humphrey, MD AF Fruchter, JS Cole, CR Williams, MD Vermeul, VR Amonette, JE Szecsody, JE Istok, JD Humphrey, MD TI Creation of a subsurface permeable treatment zone for aqueous chromate contamination using in situ redox manipulation SO GROUND WATER MONITORING AND REMEDIATION LA English DT Article ID CHROMIUM(III) OXIDATION; DELTA-MNO2 AB An in situ redox manipulation (ISRM) method for creating a permeable treatment zone in the subsurface has been developed at the laboratory bench and intermediate scales and deployed at the field scale for reduction/immobilization of chromate contamination. At other sites, the same redox technology is currently being tested for dechlorination of TCE. The reduced zone is created by injected reagents that reduce iron naturally present in the aquifer sediments from Fe(III) to surface-bound and structural Fe(II) species. Standard ground water wells are used, allowing treatment of contaminants too deep below the ground surface for conventional trench-and-fill technologies. A proof-of-principle field experiment was conducted in September 1995 at a chromate (hexavalent chromium) contaminated groundwater site an the Hanford Site in Washington. The test created a 15 m (similar to 50 feet) diameter cylindrical treatment zone. The three phases of the test consisted of (1) injection of 77,000 L (20,500 gallons) of buffered sodium dithionite solution in 17.1 hours, (2) reaction for 18.5 hours, and (3) withdrawal of 375,000 L (99,600 gallons) in 83 hours. The withdrawal phase recovered 87% to 90% of the reaction products. Analysis of post-experimental sediment cores indicated that 60% to 100% of the available reactive iron in the treated zone was reduced. The longevity of the reduced zone is estimated between seven and 12 years based on the post-experiment core samples. Three and half years after the field test, the treatment zone remains anoxic, and hexavalent chromium levels have been reduced from 0.060 mg/L to below detection limits (0.008 mg/L). Additionally, no significant permeability changes have been detected during any phase of the experiment. C1 Battelle NW, Pacific NW Natl Lab, Hydrol Sect, Richland, WA 99352 USA. Battelle NW, Pacific NW Natl Lab, Environm Technol Div, Richland, WA 99352 USA. Battelle NW, Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Oregon State Univ, Dept Civil Construct & Environm Engn, Corvallis, OR 97331 USA. RP Fruchter, JS (reprint author), Battelle NW, Pacific NW Natl Lab, Hydrol Sect, POB 999, Richland, WA 99352 USA. NR 32 TC 42 Z9 44 U1 1 U2 19 PU GROUND WATER PUBLISHING CO PI WESTERVILLE PA 601 DEMPSEY RD, WESTERVILLE, OH 43081 USA SN 1069-3629 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD SPR PY 2000 VL 20 IS 2 BP 66 EP 77 DI 10.1111/j.1745-6592.2000.tb00267.x PG 12 WC Water Resources SC Water Resources GA 315RZ UT WOS:000087127900007 ER PT J AU Vargo, GJ AF Vargo, GJ TI The ICRP database of dose coefficients: Workers and members of the public, version 1.0, an extension of ICRP Publications 68 and 72 SO HEALTH PHYSICS LA English DT Software Review C1 Pacific NW Lab, Richland, WA 99352 USA. NR 4 TC 1 Z9 1 U1 1 U2 3 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 MAR PY 2000 VL 78 IS 3 BP 343 EP 343 DI 10.1097/00004032-200003000-00015 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 285XZ UT WOS:000085414800015 ER PT J AU Panchal, CB AF Panchal, CB TI Fouling rates, Not fouling resistances SO HEAT TRANSFER ENGINEERING LA English DT Editorial Material C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Panchal, CB (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 5 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 USA SN 0145-7632 J9 HEAT TRANSFER ENG JI Heat Transf. Eng. PD MAR-APR PY 2000 VL 21 IS 2 BP 1 EP 3 PG 3 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA 294LN UT WOS:000085912900001 ER PT J AU Kim, MHY Thibeault, SA Wilson, JW Simonsen, LC Heilbronn, L Chang, K Kiefer, RL Weakley, JA Maahs, HG AF Kim, MHY Thibeault, SA Wilson, JW Simonsen, LC Heilbronn, L Chang, K Kiefer, RL Weakley, JA Maahs, HG TI Development and testing of in situ materials for human exploration of Mars SO HIGH PERFORMANCE POLYMERS LA English DT Article ID COSMIC-RAYS AB Interplanetary space radiation poses a serious health hazard in long-term manned space missions. Natural Martian surface materials are evaluated for their potential use as radiation shields for manned Mars missions. The modified radiation fluences behind various kinds of Martian rocks and regolith are determined by solving the Boltzmann equation using NASA Langley's HZETRN code along with the 1977 Solar Minimum galactic cosmic ray environmental model. To make structural shielding composite materials from constituents of the Martian atmosphere and from Martian regolith for Martian surface habitats, schemes for synthesizing polyimide from the Martian atmosphere and for processing Martian regolith/polyimide composites are proposed. Theoretical predictions of the shielding properties of these composites are computed to assess their shielding effectiveness. Adding high-performance polymer binders to Martian regolith to enhance the structural properties also enhances the shielding properties of these composites because of the added hydrogenous constituents. Laboratory testing of regolith simulant/polyimide composites is planned in order to validate this prediction and also to measure various structural properties. C1 Coll William & Mary, Williamsburg, VA 23187 USA. NASA, Langley Res Ctr, Hampton, VA 23681 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Christopher Newport Univ, Newport News, VA 23606 USA. RP Kim, MHY (reprint author), Coll William & Mary, Williamsburg, VA 23187 USA. EM m.y.kim@larc.nasa.gov RI Heilbronn, Lawrence/J-6998-2013 OI Heilbronn, Lawrence/0000-0002-8226-1057 NR 24 TC 8 Z9 8 U1 0 U2 5 PU SAGE PUBLICATIONS LTD PI LONDON PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND SN 0954-0083 J9 HIGH PERFORM POLYM JI High Perform. Polym. PD MAR PY 2000 VL 12 IS 1 BP 13 EP 26 DI 10.1088/0954-0083/12/1/302 PG 14 WC Polymer Science SC Polymer Science GA 300QG UT WOS:000086263200004 ER PT J AU Wong, PC Foote, H Leung, R Adams, D Thomas, J AF Wong, PC Foote, H Leung, R Adams, D Thomas, J TI Data signatures and visualization of scientific data sets SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Editorial Material C1 Pacific NW Lab, Richland, WA 99352 USA. RP Wong, PC (reprint author), Pacific NW Lab, Richland, WA 99352 USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD MAR-APR PY 2000 VL 20 IS 2 BP 12 EP 15 PG 4 WC Computer Science, Software Engineering SC Computer Science GA 286MR UT WOS:000085450200003 ER PT J AU Booker, S AF Booker, S TI Where are we now? SO IEEE INSTRUMENTATION & MEASUREMENT MAGAZINE LA English DT Editorial Material RP Booker, S (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1094-6969 J9 IEEE INSTRU MEAS MAG JI IEEE Instrum. Meas. Mag. PD MAR PY 2000 VL 3 IS 1 BP 4 EP 4 PG 1 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA 316VK UT WOS:000087188600003 ER PT J AU Blyler, JE AF Blyler, JE TI The softening of hardware SO IEEE INSTRUMENTATION & MEASUREMENT MAGAZINE LA English DT Editorial Material C1 US DOE, Washington, DC 20585 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1094-6969 J9 IEEE INSTRU MEAS MAG JI IEEE Instrum. Meas. Mag. PD MAR PY 2000 VL 3 IS 1 BP 46 EP 47 PG 2 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA 316VK UT WOS:000087188600013 ER PT J AU Banks, PS Perry, MD Yanovsky, V Fochs, SN Stuart, BC Zweiback, J AF Banks, PS Perry, MD Yanovsky, V Fochs, SN Stuart, BC Zweiback, J TI Novel all-reflective stretcher for chirped-pulse amplification of ultrashort pulses SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID TI-SAPPHIRE LASER; OPTICAL PULSES; GRATING PAIRS; COMPRESSION; COMPENSATION; SYSTEMS; GENERATION; DISPERSION; EXPANSION; TERAWATT AB In this paper, we describe the design and operation of an all-reflective on-axis pulse stretcher (with only four simple elements) that has achieved stretching ratios of over 40 000. The design is insensitive to alignment errors and is simple to align. Optical aberrations in the system have an effect on the fourth-order phase term, but this can be used to compensate for material dispersion, resulting in a quintic-phase-limited chirped-pulse-amplification system. C1 Univ Calif Lawrence Livermore Natl Lab, Laser Programs, Livermore, CA 94550 USA. RP Banks, PS (reprint author), Univ Calif Lawrence Livermore Natl Lab, Laser Programs, Livermore, CA 94550 USA. RI Yanovsky, Victor/B-5899-2008; Stuart, Brent/K-4988-2015 NR 25 TC 29 Z9 29 U1 0 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD MAR PY 2000 VL 36 IS 3 BP 268 EP 274 DI 10.1109/3.825872 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA 293JB UT WOS:000085847400003 ER PT J AU Freund, HP Biedron, SG Milton, SV AF Freund, HP Biedron, SG Milton, SV TI Nonlinear harmonic generation in free-electron lasers SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article DE electromagnetic radiation; electron beam applications; free-electron lasers; frequency conversion; frequency-domain analysis; nonlinearities; nonlinear differential equations; simulation ID RADIATION; PERFORMANCE; AMPLIFIER; DESIGN; FIELD AB A three-dimensional nonlinear simulation code to treat multiple frequencies simultaneously is described and used to study nonlinear harmonic generation in free-electron lasers (FELs), Strong nonlinear harmonic gain is found where the gain length varies inversely with the harmonic number. Substantial power levels are found in the harmonics. The odd harmonics are favored with generally higher power levels since a planar wiggler geometry is employed; however, the second harmonic exhibits substantial power as well, The analysis is relevant to the emission expected from self-amplified spontaneous emission (SASE) free-electron laser schemes. C1 Sci Applicat Int Corp, Mclean, VA 22102 USA. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Freund, HP (reprint author), Sci Applicat Int Corp, Mclean, VA 22102 USA. NR 36 TC 85 Z9 85 U1 1 U2 10 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD MAR PY 2000 VL 36 IS 3 BP 275 EP 281 DI 10.1109/3.825873 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA 293JB UT WOS:000085847400004 ER PT J AU Nisse, D AF Nisse, D TI Leadership, army style SO IEEE SOFTWARE LA English DT Editorial Material C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Nisse, D (reprint author), 7000 East Ave,L-447, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 0740-7459 J9 IEEE SOFTWARE JI IEEE Softw. PD MAR-APR PY 2000 VL 17 IS 2 BP 92 EP 94 PG 3 WC Computer Science, Software Engineering SC Computer Science GA 315GF UT WOS:000087103700030 ER PT J AU Forden, G Podvig, P Postol, TA AF Forden, G Podvig, P Postol, TA TI False alarm, nuclear danger SO IEEE SPECTRUM LA English DT Article C1 Congress Budget Off, Natl Secur Div, Washington, DC 20515 USA. Moscow Inst Phys & Technol, Ctr Arms Control Energy & Environm Studies, Moscow, Russia. MIT, Cambridge, MA 02139 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Congress Off Technol, Washington, DC USA. RP Podvig, P (reprint author), Congress Budget Off, Natl Secur Div, Washington, DC 20515 USA. RI Podvig, Pavel/E-5426-2013 NR 1 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9235 J9 IEEE SPECTRUM JI IEEE Spectr. PD MAR PY 2000 VL 37 IS 3 BP 31 EP 39 DI 10.1109/6.825657 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA 292KD UT WOS:000085792400014 ER PT J AU Jedlicka, RP Castillo, SP Warne, LK AF Jedlicka, RP Castillo, SP Warne, LK TI Coupling through tortuous path narrow slot apertures into complex cavities SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article DE boundary integral equations; electromagnetic interference; finite-element methods; method of moments ID THICK CONDUCTING PLANE; ELECTROMAGNETIC SCATTERING; TM-SCATTERING; TRANSMISSION; FORMULATION; SCREEN; FIELDS; DEPTH; SLIT AB A hybrid finite-element method/method of moments (FEM/MOM) model has been implemented to compute the coupling of fields into a cavity through narrow slot apertures having depth. The model utilizes the slot model of Warne and Chen [24]-[30], which takes into account the depth of the slot, wall losses, and dielectrics with air gaps in the slot region. The cavity interior is modeled with the mixed-order covariant-projection elements of Crowley [33], Results are given showing the accuracy and generality of the method for modeling geometrically complex slot-cavity combinations. C1 New Mexico State Univ, Klipsch Sch Elect & Comp Engn, Las Cruces, NM 88003 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jedlicka, RP (reprint author), New Mexico State Univ, Klipsch Sch Elect & Comp Engn, Las Cruces, NM 88003 USA. NR 33 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD MAR PY 2000 VL 48 IS 3 BP 456 EP 466 DI 10.1109/8.841907 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA 311NK UT WOS:000086890300013 ER PT J AU Sutter, DF Strauss, BP AF Sutter, DF Strauss, BP TI Next generation high energy physics colliders: Technical challenges & prospects SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB High energy particle physics is about studying the fundamental properties of matter at the highest achievable particle energies. The use of superconducting magnet technology has become central to the generation of high energy particle beams over the last 30 years. The first announcement of a practical II superconductor, Nb3Sn, was in 1961. Within a month high energy particle physicists began to explore the ways these new materials could be used in their research apparatus. Within a decade stable NbTi materials were being used in large, constant current magnets for particle detectors. At the end of two decades large quantities of cost effective Rutherford cable were in production, and several large particle/storage rings, using ramped dipole and quadrupole magnets, were either under construction or in the advanced stages of planning. At the end of three decades several of these were operating very successfully, and construction had begun on an accelerator/storage ring 84 kilometers in circumference. Today, almost four decades later, the SSC has succumbed to politics, not technical shortcomings, and the need for high energy particles for physics research is as urgent as ever. However, the material needs, the scale of magnet performance, and the politics are all different. It is the purpose of this paper to briefly review this development and the reasons for it, and then to describe the current needs and possible future directions. C1 US Dept Energy, Germantown, MD 20874 USA. RP Sutter, DF (reprint author), US Dept Energy, Germantown, MD 20874 USA. NR 6 TC 5 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 33 EP 43 DI 10.1109/77.828171 PG 11 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700003 ER PT J AU Andreev, N Arkan, TT Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Kerby, J Lamm, MJ Limon, PJ Makarov, A Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Robotham, W Sabbi, G Schlabach, P Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, AD Scanlan, R Ghosh, A AF Andreev, N Arkan, TT Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Kerby, J Lamm, MJ Limon, PJ Makarov, A Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Robotham, W Sabbi, G Schlabach, P Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, AD Scanlan, R Ghosh, A TI Recent results from the LHC inner triplet quadrupole development program at Fermilab SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Fermilab, in collaboration with LBNL and BNL, is in the process of developing a focusing quadrupole for installation in the interaction region inner triplets of the LHC. This magnet is required to have an operating gradient of 215 T/m across a 70mm coil bore, and operates in superfluid helium at 1.9K. The design is based on a two layer cos (2 theta) coil, mechanically supported by standalone steel collars. The collared coil assembly is surrounded by a iron yoke for flu return, and the assembly enclosed by a stainless steel shell. The development program has addressed mechanical, magnetic, quench protection, and thermal issues, through a series of model magnets constructed at Fermilab. This paper summarizes results from the recent model tests, and the status of the program. C1 Fermilab, Batavia, IL 60510 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Andreev, N (reprint author), Fermilab, Batavia, IL 60510 USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 57 EP 60 DI 10.1109/77.828175 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700007 ER PT J AU Andreev, N Arkan, T Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Glass, H Kerby, J Lamm, MJ Makarov, A Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Rabehl, R Robotham, W Sabbi, G Schlabach, P Sylvester, C Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, AD Scanlan, R Ghosh, A AF Andreev, N Arkan, T Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Glass, H Kerby, J Lamm, MJ Makarov, A Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Rabehl, R Robotham, W Sabbi, G Schlabach, P Sylvester, C Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, AD Scanlan, R Ghosh, A TI Quench behavior of quadrupole model magnets for the LHC inner triplets at Fermilab SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB The US-LHC Accelerator Project is responsible for the design and production of inner triplet high gradient quadrupoles for installation in the LHC Interaction Region. The quadrupoles are required to deliver a nominal field gradient of 215T/m in a 70mm bore, and operate in superfluid helium. As part of the magnet development program, a series of am model magnets have been built and tested at Fermilab, with each magnet being tested over several thermal cycles. This paper summarizes the quench performance and analysis of the model magnets tested, including quench training, and the ramp rate and temperature dependence of the magnet quench current. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Andreev, N (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 103 EP 106 DI 10.1109/77.828186 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700018 ER PT J AU Andreev, N Arkan, T Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Glass, H Kerby, J Lamm, MJ Makarov, AA Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Peterson, T Rabehl, R Robotham, W Sabbi, G Schlabach, P Sylvester, C Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, D Scanlan, R Ghosh, A AF Andreev, N Arkan, T Bauer, P Bossert, R Brandt, J Chichili, DR Carson, J DiMarco, J Feher, S Glass, H Kerby, J Lamm, MJ Makarov, AA Nobrega, A Novitski, I Ogitsu, T Orris, D Ozelis, JP Peterson, T Rabehl, R Robotham, W Sabbi, G Schlabach, P Sylvester, C Strait, J Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV Caspi, S McInturff, D Scanlan, R Ghosh, A TI Field quality in Fermilab-built models of high gradient quadrupole magnets for the LHC interaction regions SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Superconducting quadrupole magnets for the interaction regions of the Large Hadron Collider are being developed by the US-LHC Accelerator Project. These 70 mm bore quadrupole magnets are intended to operate in superfluid helium at 1.9 K with a nominal field gradient of 215 T/m. A series of 2 m model magnets are being built and tested at Fermilab to optimize design and construction parameters. Measurements of the field quality of the model magnets tested to date and comparisons with the required field quality are reported in this paper. C1 Fermilab, Batavia, IL 60510 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Andreev, N (reprint author), Fermilab, Batavia, IL 60510 USA. NR 7 TC 5 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 107 EP 110 DI 10.1109/77.828187 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700019 ER PT J AU Bossert, R DiMarco, J Feher, S Lamm, MJ Nobrega, A Orris, D Ozelis, JP Tartaglia, M Tompkins, JC Zlobin, AV McInturff, AD AF Bossert, R DiMarco, J Feher, S Lamm, MJ Nobrega, A Orris, D Ozelis, JP Tartaglia, M Tompkins, JC Zlobin, AV McInturff, AD TI Quench protection studies of LHC interaction region quadrupoles at Fermilab SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB ID HIGH-GRADIENT QUADRUPOLE AB High gradient quadrupoles are being developed by the US-LHC Accelerator Project for the LHC interaction region inner triplets. Protection strip heaters are the primary means of protecting these magnets against excessively high foil temperatures and coil voltage to ground as a result of a spontaneous quench. The main objective of the quench protection R&D program is to optimize the heater performance within the constraints of the LHC heater power supply and quench detection system. The results of these studies on several two meter long model magnets are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. RP Bossert, R (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 111 EP 114 DI 10.1109/77.828188 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700020 ER PT J AU Andreev, N Arkan, T Bossert, R Chichili, DR Feher, S Kerby, J Lamm, MJ Makarov, A Nobrega, A Novitski, I Orris, D Ozelis, JP Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV AF Andreev, N Arkan, T Bossert, R Chichili, DR Feher, S Kerby, J Lamm, MJ Makarov, A Nobrega, A Novitski, I Orris, D Ozelis, JP Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV TI Mechanical design and analysis of LHC inner triplet quadrupole magnets Fermilab SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB A series of model magnets is being constructed and tested at Fermilab in order to verify the design of high gradient quadrupole magnets for the LHC interaction region inner triplets. The 2m models are being built in order to refine the mechanical and magnetic design, optimize fabrication and assembly tooling, and ensure adequate quench performance, This has been carried out using a complementary combination of analytical and FEA modeling, empirical tests on 0.4m mechanical assemblies, and testing of model magnets during fabrication and under cryogenic conditions. The results of these tests and studies have led to improvements in the design of the magnet end restraints, to a preferred choice in coil end part material, and to a better understanding of factors affecting coil stress throughout the fabrication and operational stages. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Andreev, N (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 1 Z9 1 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 115 EP 118 DI 10.1109/77.828189 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700021 ER PT J AU Andreev, N Arkan, T Bossert, R Brandt, J Chichili, DR Kerby, J Nobrega, A Novitski, I Ozelis, J Yadav, S Zlobin, AV AF Andreev, N Arkan, T Bossert, R Brandt, J Chichili, DR Kerby, J Nobrega, A Novitski, I Ozelis, J Yadav, S Zlobin, AV TI Study of kapton insulated superconducting coils manufactured for the LHC inner triplet model magnets at Fermilab SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Fermilab has constructed a number of 2m model quadrupoles as part of an ongoing program to develop and optimize the design of quadrupoles for the LHC Interaction Region inner triplets. The quadrupole design is based upon a two layer shell type coil of multi-filament NbTi strands in Rutherford cable, insulated with Kapton film. As such, the coil size and mechanical properties are critical in achieving the desired prestress and field quality targets for the agent. Throughout the model magnet program, different design and manufacturing techniques have been studied to obtain coils with the required mechanical properties. This paper summarizes the structural material and coil mechanical properties, coil design optimization results and production experience accumulated in the model R&D program. C1 Fermi Natl Accelerator Lab, Tech Div, Batavia, IL 60510 USA. RP Andreev, N (reprint author), Fermi Natl Accelerator Lab, Tech Div, POB 500, Batavia, IL 60510 USA. NR 5 TC 2 Z9 2 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 119 EP 122 DI 10.1109/77.828190 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700022 ER PT J AU Sabbi, G DiMarco, J Nobrega, A Ogitsu, T Schlabach, P Tompkins, JC Yadav, S AF Sabbi, G DiMarco, J Nobrega, A Ogitsu, T Schlabach, P Tompkins, JC Yadav, S TI Correction of high gradient quadrupole harmonics with magnetic shims SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Superconducting quadrupole magnets with 70 mm aperture and nominal field gradient of 215 T/m are being developed by the US-LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. Due to large beam size and orbit displacement in the final focusing triplet, these magnets are subject to stringent field quality requirements. For this reason, a correction scheme based on magnetic shims was investigated. This paper reports design calculations, fabrication issues and tests results involving magnetic shims. C1 Fermilab, Batavia, IL 60510 USA. RP Sabbi, G (reprint author), Fermilab, Batavia, IL 60510 USA. NR 6 TC 7 Z9 7 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 123 EP 126 DI 10.1109/77.828191 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700023 ER PT J AU DiMarco, J Glass, H Lamm, MJ Schlabach, P Sylvester, C Tompkins, JC Krzywinski, J AF DiMarco, J Glass, H Lamm, MJ Schlabach, P Sylvester, C Tompkins, JC Krzywinski, J TI Field alignment of quadrupole magnets for the LHC interaction regions SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. Determination of the magnetic axis for alignment of these magnets will be performed using a single stretched wire system. These measurements will be done both at room and cryogenic temperatures with very long wire lengths, up to 20m. This paper reports on the stretched wire alignment methodology to be employed and the results of recent room-temperature measurements on a 2 m model magnet with long wire lengths. C1 Fermilab, Batavia, IL 60510 USA. Polish Acad Sci, Inst Phys, Warsaw, Poland. RP DiMarco, J (reprint author), Fermilab, Batavia, IL 60510 USA. NR 3 TC 23 Z9 23 U1 1 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 127 EP 130 DI 10.1109/77.828192 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700024 ER PT J AU Caspi, S Lietzke, AF AF Caspi, S Lietzke, AF TI A training mechanism in superconducting accelerator magnets SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB We describe and discuss a mechanism that can contribute to "training" in superconducting accelerator magnets. This is believed to be most relevant when magnet construction and assembly procedures constrain axially compressed cable with friction. Axial compression of a cable causes partial decabling and high axial compliance. Displaced strands are friction-immobilized during subsequent collaring. Lorentz forces attempt to expand the coils and reduce pole friction, thereby allowing displaced strands to slip toward Lorentz equilibrium and heat the conductor. A simple, 2-D model quantifies the intuitive model, and is used to estimate the stress/strain conditions near the inner-layer ends of a Fermi Lab LHC IR, quadrupole. Mitigation measures include friction reduction, compliance reduction and pole-turn stretching during collaring. We expect the high temperature reaction in "wind and react" Nb3Sn magnets to reduce a coil's axial cable compression, while compacting the ends. This reduced axial compliance may substantially decrease training as a result of this mechanism. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Caspi, S (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 174 EP 177 DI 10.1109/77.828204 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700036 ER PT J AU Jain, A Anerella, M Escallier, J Ganetis, G Ghosh, A Gupta, R Kelly, E Marone, A Morgan, G Muratore, J Prodell, A Sampson, W Thomas, R Thompson, P Wanderer, P Willen, E AF Jain, A Anerella, M Escallier, J Ganetis, G Ghosh, A Gupta, R Kelly, E Marone, A Morgan, G Muratore, J Prodell, A Sampson, W Thomas, R Thompson, P Wanderer, P Willen, E TI Superconducting 13 cm corrector magnets for the relativistic heavy ion collider (RHIC) SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB DE correctors; RHIC AB A total of 72 corrector magnets of 13 cm aperture and 0.5 m length are required in RHIC to correct for field errors in the interaction region quadrupoles and for other global corrections. The coils for these magnets were wound on a flat substrate using a computer controlled machine. Each corrector has four such coils of multipolar orders ranging from the dipole through the dodecapole, wrapped onto support tubes and concentrically assembled inside an iron yoke. There are five different model types depending on the combination of coils used. A critical issue was the alignment of the magnetic centers and the field angles of various coils. Adjustable shims were incorporated in the design to deal with unacceptable misalignments that could result from construction tolerances. Each magnet was partially assembled with nominal shims and was warm measured with a rotating coil system. The shims were then adjusted as necessary to keep the field angles within +/-1 mrad, and the relative alignment of the magnetic centers within +/- 0.2 mm. The field error harmonics are typically below 1% of the dominant multipole term at a reference radius of 40 mm, with some exceptions. All the magnets were tested for reliable operation at 4.35 K by performing bipolar power cycles to the maximum test current of 70 A for the dipole and 100 A for all the other coils, well above the maximum operating current of 50 A. C1 Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. RP Jain, A (reprint author), Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. NR 3 TC 1 Z9 1 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 188 EP 191 DI 10.1109/77.828207 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700039 ER PT J AU Meinke, RB Faltens, A Bangerter, RO Scanlan, RM Seidl, PS AF Meinke, RB Faltens, A Bangerter, RO Scanlan, RM Seidl, PS TI Development of quadrupole arrays for heavy-ion fusion SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Extensive studies have been performed to optimize the design of superconducting quadrupole arrays for beam transport in future heavy-ion fusion accelerators. In these arrays, 20 or more quadrupole coils are densely packed with their axes aligned in parallel. Field strengths between 3 and 5 tesla at the inner coil diameters have been investigated. The aperture of the individual quadrupoles has been varied between 60 mm and 240 mm. The coils have a typical length of 1 m, and special effort has been made to minimize the length of the interconnect region between the array and adjacent accelerator components. The relative orientation of quadrupoles in the array is chosen to optimize field sharing between neighboring cells. In the presented design, field uniformity in the boundary cells is maintained by placing concentric correction coils onto these cells. A novel approach for the mechanical stabilization and alignment of the individual quads in the array has been developed. Since Inertial Fusion Energy has to compete with other long-term energy sources, cost and reliability are major issues of the magnet array. The presented design uses a round NbTi mini-cable, which allows for a cost-effective, highly automated manufacturing of the required superconducting coils. A flexible, 37-strand mini-cable has been developed and prototype manufacturing has started. C1 Adv Magnet Lab Inc, Palm Bay, FL 32905 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. RP Meinke, RB (reprint author), Adv Magnet Lab Inc, Palm Bay, FL 32905 USA. NR 3 TC 3 Z9 3 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 192 EP 195 DI 10.1109/77.828208 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700040 ER PT J AU Green, MA Eyssa, Y Kenny, S Miller, JR Prestemon, S Weggel, RJ AF Green, MA Eyssa, Y Kenny, S Miller, JR Prestemon, S Weggel, RJ TI Superconducting solenoids for the muon collider SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB The muon collider, is a new idea for lepton colliders. The ultimate energy of an electron ring is limited by synchrotron radiation, Muons, which have a rest mass that is 200 times that of an electron can be stored at much higher before synchrotron performance. The problem with muons is their short life time (2.1 mu s at rest). In order to operate a muon storage ring large numbers of muon must be collected, cooled and accelerated before they decay to an electron and two neutrinos. As we see it now, high field superconducting solenoids are an integral part of a muon collider muon production and cooling systems. This report will describe the design parameters for superconducting and hybrid solenoids that are used for pion production and collection, RF phase rotations of the pions as they decay into muons and the muon cooling (reduction of the muon emittance) before acceleration. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Natl High Magnet Field Lab, Tallahassee, FL USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Green, MA (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 10 TC 5 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 196 EP 201 DI 10.1109/77.828209 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700041 ER PT J AU Foster, GW Kashikhin, VS Novitski, I AF Foster, GW Kashikhin, VS Novitski, I TI Design of a 2 tesla transmission line magnet for the VLHC SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB A prototype of the transmission line magnet for the Very Large Hadron Collider is being designed at Fermilab, This is a single-turn warm iron superconducting magnet in a "Double-C" configuration, Iron poles form a high quality alternating-gradient magnet field in two 20 mm height beam gaps. Simple magnet construction and manufacturing processes and a room temperature iron yoke give a significant reduction in magnet cost. Open beam gaps simplify magnetic measurements and vacuum chamber installation, The magnet mechanical stability was investigated for several mechanical models. A high field quality over the whole range (0,1T - 2,0T) of field variation was calculated using correcting holes in the iron poles. The magnet optimization was carried out by POISSON, OPERA 2D and ANSYS codes. The results of magnet design and model tests are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Foster, GW (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 202 EP 205 DI 10.1109/77.828210 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700042 ER PT J AU Willen, E Anerella, M Escallier, J Ganetis, G Ghosh, A Jain, A Kelly, E Morgan, G Muratore, J Prodell, A Wanderer, P Gupta, R Okamura, M AF Willen, E Anerella, M Escallier, J Ganetis, G Ghosh, A Jain, A Kelly, E Morgan, G Muratore, J Prodell, A Wanderer, P Gupta, R Okamura, M TI Performance of helical magnets for RHIC SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB Helical magnets are being built for the Relativistic Heavy Ion Collider (RHIC) to act as Snakes and Rotators in a planned program of polarized colliding beam experiments, After a successful R&D program, production; is underway to build the needed magnets. They are constructed as superconducting, 10 cm coil aperture units in which a 4 T dipole field rotates through 360 degrees in a length of 2.4 m. Measurements have been made on the initial production magnets, including training, magnetic fields, and quench propagation characteristics. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Lawrence Berkeley Natl Lab, Berkeley, CA USA. RP Willen, E (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 8 TC 0 Z9 0 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 214 EP 219 DI 10.1109/77.828213 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700045 ER PT J AU Schmalzle, J Anerella, M Ganetis, G Jain, A Morgan, G Muratore, J Wanderer, P AF Schmalzle, J Anerella, M Ganetis, G Jain, A Morgan, G Muratore, J Wanderer, P TI RHIC DX dipole magnet construction SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB DE superconducting magnets; dipoles; RHIC AB The Relativistic Heavy Ion Collider DX dipole magnet has a bore of 180 mm, an overall length of 4.0 m, a nominal operating field of 4.28 T and a coil pre-load of 28 kpsi, A brief R&D program using short coil sections was used to verify the insulation scheme, to make sure the required coil pre-load could be achieved and to monitor the load loss over time. A full length prototype magnet was built and tested, to verify the design, test out the tooling, fine tune the assembly procedures and measure the field quality and quench performance. Changes were incorporated after each phase. This report describes each phase, including the problems encountered, the lessons learned, and the resulting changes made to the magnet design and assembly procedures. Critical data from subsequent production magnets are also included. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Schmalzle, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 1 Z9 1 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 220 EP 223 DI 10.1109/77.828214 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700046 ER PT J AU Taylor, C Caspi, S Leitner, M Lundgren, S Lyneis, C Wutte, D Wang, ST Chen, JY AF Taylor, C Caspi, S Leitner, M Lundgren, S Lyneis, C Wutte, D Wang, ST Chen, JY TI Magnet system for an ECR ion source SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB A superconducting magnet assembly has been built for an ECR (Electron Cyclotron Resonance) Ion source at the 88-inch cyclotron at LBL1. Three 34-cm ID solenoids provide axial plasma confinement and a sextupole assembly in the solenoid bore provides radial stability. Two large solenoids are spaced 50 cm. apart with a smaller opposing solenoid between. The sextupole assembly is 92 cm long with winding inner diameter of 20 cm. and outer diameter of 27.2 cm. The design goal is to achieve a field on axis of 4 T and 3 T at the mirrors with 0.4 T between and a sextupole field of 2.0 T at 15-cm diameter in the confinement volume. Each solenoid uses rectangular conductor with copper/SC ratio of 4; the three coils are wet-wound on a one-piece aluminum bobbin with aluminum banding for radial support. The sextupole uses rectangular conductor with copper/SC ratio of 3. Each of the 6 coils is wet-wound with filled epoxy on a metal pole; the ends of the pole are aluminum and the central 34-cm is iron to augment the sextupole field. The six coils are assembled on a 20-cm-OD stainless steel tube with a 1.4-cm thick 30.0-cm OD aluminum tube over the assembly for structural support. Thin metal bladders are expanded azimuthally between each coil and axially at the ends to pre-load the assembly. The sextupole assembly fits inside the solenoid bobbin, which provides support for the magnetic forces. The magnet exceeds design requirements with minimum training. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Wang NMR Inc, Livermore, CA USA. RP Taylor, C (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 2 TC 35 Z9 35 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 224 EP 227 DI 10.1109/77.828215 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700047 ER PT J AU Parker, B Anerella, M Escallier, J Ghosh, A Jain, A Marone, A Muratore, J Prodell, A Thomas, R Thompson, P Wanderer, P Brueck, H Willeke, F Wolff, S AF Parker, B Anerella, M Escallier, J Ghosh, A Jain, A Marone, A Muratore, J Prodell, A Thomas, R Thompson, P Wanderer, P Brueck, H Willeke, F Wolff, S TI Test of a model superconducting magnet for the HERA ep interaction regions SO IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 16th International Conference on Magnet Technology CY SEP 26-OCT 02, 1999 CL NATL HIGH MAGNET FIELD LAB, PONTE VEDRA BEACH, FLORIDA SP Natl High Magnet Field Lab, Natl Sci Fdn, State Florida, Brookhaven Natl Lab, BWX Technol Inc, Florida State Univ, Off Res, IEEE, Council Superconductiv, Magnex Sci Ltd, Oxford Instruments, Res Instruments Div, Princeton Plasma Phys Lab, NHMFL, Los Almos Natl Lab, Pulsed Field Facil, USN, Res Off, US DOE, Div High Energy Phys, US DOE, Superconductiv Program Elect Power, Vacuumschmeleze GmbH HO NATL HIGH MAGNET FIELD LAB AB For the HERA luminosity upgrade two types of compact multifunction superconducting magnets, denoted GO and GG, are needed for installation inside the existing ZEUS and H1 experimental detectors in the year 2000. These magnets contain multiple concentric coil layers organized into independently powered quadrupole, dipole, skew quadrupole and skew dipole coil windings. Production of the first of three GO magnets using a newly constructed coil winding machine is currently in progress at BNL. The GG design is being completed and parallel production at BNL of three GG units will start soon. In this paper we highlight HERA upgrade magnet design challenges, present our production solutions and relate experience and results gained from warm and cold testing of short model magnets. C1 Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. DESY, D-22607 Hamburg, Germany. RP Parker, B (reprint author), Brookhaven Natl Lab, Superconducting Magnet Div, Upton, NY 11973 USA. NR 6 TC 3 Z9 3 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1051-8223 J9 IEEE T APPL SUPERCON JI IEEE Trans. Appl. Supercond. PD MAR PY 2000 VL 10 IS 1 BP 272 EP 275 DI 10.1109/77.828227 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 295DD UT WOS:000085950700059 ER EF