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1

Diffractive photoproduction of ? mesons with large momentum transfer at HERA  

Microsoft Academic Search

The diffractive photoproduction of ? mesons, ep?e?Y, with large momentum transfer squared at the proton vertex, |t|, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb?1. The photon–proton centre of mass energy spans the range 75W95 GeV, the photon virtuality is restricted to Q20.01 GeV2 and the mass MY of the proton remnant is below 5 GeV.

A. Aktas; V. Andreev; T. Anthonis; B. Antunovic; S. Aplin; A. Asmone; A. Astvatsatourov; A. Babaev; S. Backovic; A. Baghdasaryan; P. Baranov; E. Barrelet; W. Bartel; S. Baudrand; S. Baumgartner; J. Becker; M. Beckingham; O. Behnke; O. Behrendt; A. Belousov; N. Berger; J. C. Bizot; M.-O. Boenig; V. Boudry; J. Bracinik; G. Brandt; V. Brisson; D. Bruncko; F. W. Büsser; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; A. J. Campbell; F. Cassol-Brunner; K. Cerny; V. Cerny; V. Chekelian; J. G. Contreras; J. A. Coughlan; B. E. Cox; G. Cozzika; J. Cvach; J. B. Dainton; W. D. Dau; K. Daum; Y. de Boer; B. Delcourt; M. Del Degan; A. De Roeck; E. A. De Wolf; C. Diaconu; V. Dodonov; A. Dubak; G. Eckerlin; V. Efremenko; S. Egli; R. Eichler; F. Eisele; A. Eliseev; E. Elsen; S. Essenov; A. Falkewicz; P. J. W. Faulkner; L. Favart; A. Fedotov; R. Felst; J. Feltesse; L. Finke; M. Fleischer; P. Fleischmann; G. Flucke; A. Fomenko; G. Franke; T. Frisson; E. Gabathuler; J. Gayler; C. Gerlich; S. Ghazaryan; S. Ginzburgskaya; A. Glazov; I. Glushkov; L. Goerlich; M. Goettlich; N. Gogitidze; S. Gorbounov; C. Grab; T. Greenshaw; M. Gregori; B. R. Grell; G. Grindhammer; C. Gwilliam; D. Haidt; L. Hajduk; M. Hansson; G. Heinzelmann; R. C. W. Henderson; H. Henschel; G. Herrera; M. Hildebrandt; K. H. Hiller; D. Hoffmann; R. Horisberger; A. Hovhannisyan; T. Hreus; S. Hussain; M. Ibbotson; M. Jacquet; L. Janauschek; X. Janssen; V. Jemanov; L. Jönsson; D. P. Johnson; A. W. Jung; H. Jung; M. Kapichine; J. Katzy; I. R. Kenyon; C. Kiesling; M. Klein; C. Kleinwort; T. Klimkovich; G. Knies; A. Knutsson; V. Korbel; P. Kostka; K. Krastev; J. Kretzschmar; A. Kropivnitskaya; K. Krüger; M. P. J. Landon; W. Lange; T. Laštovi?ka; G. Laštovi?ka-Medin; P. Laycock; A. Lebedev; G. Leibenguth; V. Lendermann; S. Levonian; L. Lindfeld; K. Lipka; A. Liptaj; B. List; J. List; E. Lobodzinska; N. Loktionova; R. Lopez-Fernandez; V. Lubimov; A.-I. Lucaci-Timoce; H. Lueders; D. Lüke; T. Lux; L. Lytkin; A. Makankine; N. Malden; E. Malinovski; S. Mangano; P. Marage; R. Marshall; M. Martisikova; H.-U. Martyn; S. J. Maxfield; A. Mehta; K. Meier; A. B. Meyer; H. Meyer; J. Meyer; V. Michels; S. Mikocki; I. Milcewicz-Mika; D. Milstead; A. Mohamed; F. Moreau; A. Morozov; J. V. Morris; M. U. Mozer; K. Müller; P. Murín; K. Nankov; B. Naroska; Th. Naumann; P. R. Newman; C. Niebuhr; A. Nikiforov; G. Nowak; K. Nowak; M. Nozicka; R. Oganezov; B. Olivier; J. E. Olsson; S. Osman; D. Ozerov; V. Palichik; I. Panagoulias; T. Papadopoulou; C. Pascaud; G. D. Patel; H. Peng; E. Perez; D. Perez-Astudillo; A. Perieanu; A. Petrukhin; D. Pitzl; R. R. Pla?akyt?; B. Portheault; P. Prideaux; A. J. Rahmat; N. Raicevic; P. Reimer; A. Rimmer; C. Risler; E. Rizvi; P. Robmann; B. Roland; R. Roosen; A. Rostovtsev; Z. Rurikova; S. Rusakov; F. Salvaire; D. P. C. Sankey; E. Sauvan; S. Schätzel; S. Schmidt; C. Schmitz; L. Schoeffel; A. Schöning; H.-C. Schultz-Coulon; F. Sefkow; R. N. Shaw-West; I. Sheviakov; L. N. Shtarkov; T. Sloan; P. Smirnov; Y. Soloviev; D. South; V. Spaskov; A. Specka; M. Steder; B. Stella; J. Stiewe; U. Straumann; D. Sunar; V. Tchoulakov; G. Thompson; P. D. Thompson; T. Toll; F. Tomasz; D. Traynor; P. Truöl; I. Tsakov; G. Tsipolitis; I. Tsurin; J. Turnau; E. Tzamariudaki; K. Urban; M. Urban; A. Usik; D. Utkin; A. Valkárová; C. Vallée; P. Van Mechelen; A. Vargas Trevino; Y. Vazdik; C. Veelken; S. Vinokurova; V. Volchinski; K. Wacker; G. Weber; R. Weber; D. Wegener; C. Werner; M. Wessels; B. Wessling; Ch. Wissing; R. Wolf; E. Wünsch; S. Xella; W. Yan; V. Yeganov; J. Žá?ek; J. Zálešák; Z. Zhang; A. Zhelezov; Y. C. Zhu; J. Zimmermann; T. Zimmermann; H. Zohrabyan; F. Zomer

2006-01-01

2

Electroproduction of the N*(1535) Resonance at Large Momentum Transfer  

SciTech Connect

We report on the first lattice calculation of light-cone distribution amplitudes of the N*(1535) resonance, which are used to calculate the transition form factors at large momentum transfers using light-cone sum rules. In the region Q{sup 2}>2 GeV{sup 2}, where the light-cone expansion is expected to converge, the results appear to be in good agreement with the experimental data.

Braun, V. M.; Goeckeler, M.; Kaltenbrunner, T.; Lenz, A.; Rohrwild, J.; Schaefer, A.; Warkentin, N. [Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg (Germany); Horsley, R.; Zanotti, J. M. [School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom); Nakamura, Y. [Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg (Germany); Deutsches Elektronen-Synchrotron DESY, 15738 Zeuthen (Germany); Pleiter, D. [Deutsches Elektronen-Synchrotron DESY, 15738 Zeuthen (Germany); Rakow, P. E. L. [Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX (United Kingdom); Schierholz, G. [Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg (Germany); Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg (Germany); Stueben, H. [Konrad-Zuse-Zentrum fuer Informationstechnik Berlin, 14195 Berlin (Germany)

2009-08-14

3

Inclusive electron - nucleus scattering at large momentum transfer  

SciTech Connect

Inclusive electron scattering is measured with 4.045 GeV incident beam energy from C, Fe, and Au targets. The measured energy transfers and angles correspond to a kinematic range for Bjorken x>1 and momentum transfers from Q2 = 1-7 (GeV/c)2. When analyzed in terms of the y-scaling function the data show for the first time an approach to scaling for values of the initial nucleon momenta significantly greater than the nuclear matter Fermi momentum (i.e., >0.3 GeV/c).

J. Arrington; C. S. Armstrong; T. Averett; O. K. Baker; L. de Bever; C. W. Bochna; W. Boeglin; B. Bray; R. D. Carlini; G. Collins; C. Cothran; D. Crabb; D. Day; J. A. Dunne; D. Dutta; R. Ent; B. W. Filippone; A. Honegger; E. W. Hughes; J. Jensen; J. Jourdan; C. E. Keppel; D. M. Koltenuk; R. Lindgren; A. Lung; D. J. Mack; J. McCarthy; R. D. McKeown; D. Meekins; J. H. Mitchell; H. G. Mkrtchyan; G. Niculescu; I. Niculescu; T. Petitjean; O. Rondon; I. Sick; C. Smith; B. Terburg; W. F. Vulcan; S. A. Wood; C. Yan; J. Zhao; and B. Zihlmann

1999-03-01

4

Hadron-hadron elastic scattering at large momentum transfers  

SciTech Connect

Cross sections for ..pi../sup + -/p, K/sup + -/p and p/sup + -/p elastic scattering for incident momenta above a few tens of GeV/c and momentum transfers in the range 1 less than or equal to -t less than or equal to 10 (GeV/c)/sup 2/ have recently been measured. The data are reviewed, and compared with existing models of elastic scattering.

Rubinstein, R.

1983-05-01

5

Measurement of J/ ? photoproduction at large momentum transfer at HERA  

NASA Astrophysics Data System (ADS)

The proton-dissociative diffractive photoproduction of J/ ? mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb-1. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.

Chekanov, S.; Derrick, M.; Magill, S.; Musgrave, B.; Nicholass, D.; Repond, J.; Yoshida, R.; Mattingly, M. C. K.; Antonioli, P.; Bari, G.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cindolo, F.; Corradi, M.; Iacobucci, G.; Margotti, A.; Nania, R.; Polini, A.; Antonelli, S.; Basile, M.; Bindi, M.; Cifarelli, L.; Contin, A.; de Pasquale, S.; Sartorelli, G.; Zichichi, A.; Bartsch, D.; Brock, I.; Hartmann, H.; Hilger, E.; Jakob, H.-P.; Jüngst, M.; Nuncio-Quiroz, A. E.; Paul, E.; Samson, U.; Schönberg, V.; Shehzadi, R.; Wlasenko, M.; Morris, J. D.; Kaur, M.; Kaur, P.; Singh, I.; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J. Y.; Ibrahim, Z. A.; Mohamad Idris, F.; Kamaluddin, B.; Wan Abdullah, W. A. T.; Ning, Y.; Ren, Z.; Sciulli, F.; Chwastowski, J.; Eskreys, A.; Figiel, J.; Galas, A.; Olkiewicz, K.; Pawlik, B.; Stopa, P.; Zawiejski, L.; Adamczyk, L.; Bo?d, T.; Grabowska-Bo?d, I.; Kisielewska, D.; ?ukasik, J.; Przybycie?, M.; Suszycki, L.; Kota?ski, A.; S?omi?ski, W.; Bachynska, O.; Behnke, O.; Behr, J.; Behrens, U.; Blohm, C.; Borras, K.; Bot, D.; Ciesielski, R.; Coppola, N.; Fang, S.; Geiser, A.; Göttlicher, P.; Grebenyuk, J.; Gregor, I.; Haas, T.; Hain, W.; Hüttmann, A.; Januschek, F.; Kahle, B.; Katkov, I. I.; Klein, U.; Kötz, U.; Kowalski, H.; Libov, V.; Lisovyi, M.; Lobodzinska, E.; Löhr, B.; Mankel, R.; Melzer-Pellmann, I.-A.; Miglioranzi, S.; Montanari, A.; Namsoo, T.; Notz, D.; Parenti, A.; Roloff, P.; Rubinsky, I.; Schneekloth, U.; Spiridonov, A.; Szuba, D.; Szuba, J.; Theedt, T.; Tomaszewska, J.; Wolf, G.; Wrona, K.; Yagües-Molina, A. G.; Youngman, C.; Zeuner, W.; Drugakov, V.; Lohmann, W.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Bamberger, A.; Dobur, D.; Karstens, F.; Vlasov, N. N.; Bussey, P. J.; Doyle, A. T.; Forrest, M.; Saxon, D. H.; Skillicorn, I. O.; Gialas, I.; Papageorgiu, K.; Holm, U.; Klanner, R.; Lohrmann, E.; Perrey, H.; Schleper, P.; Schörner-Sadenius, T.; Sztuk, J.; Stadie, H.; Turcato, M.; Long, K. R.; Tapper, A. D.; Matsumoto, T.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Barakbaev, A. N.; Boos, E. G.; Pokrovskiy, N. S.; Zhautykov, B. O.; Aushev, V.; Borodin, M.; Kadenko, I.; Korol, Ie.; Kuprash, O.; Lontkovskyi, D.; Makarenko, I.; Onishchuk, Yu.; Salii, A.; Sorokin, Iu.; Verbytskyi, A.; Viazlo, V.; Volynets, O.; Zenaiev, O.; Zolko, M.; Son, D.; de Favereau, J.; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jimenez, M.; Del Peso, J.; Ron, E.; Terrón, J.; Uribe-Estrada, C.; Corriveau, F.; Schwartz, J.; Zhou, C.; Tsurugai, T.; Antonov, A.; Dolgoshein, B. A.; Gladkov, D.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P. F.; Gladilin, L. K.; Golubkov, Yu. A.; Khein, L. A.; Korzhavina, I. A.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Yu.; Proskuryakov, A. S.; Shcheglova, L. M.; Zotkin, D. S.; Abt, I.; Caldwell, A.; Kollar, D.; Reisert, B.; Schmidke, W. B.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Pellegrino, A.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Lee, A.; Ling, T. Y.; Cooper-Sarkar, A. M.; Devenish, R. C. E.; Ferrando, J.; Foster, B.; Gwenlan, C.; Horton, K.; Oliver, K.; Robertson, A.; Walczak, R.; Bertolin, A.; Dal Corso, F.; Dusini, S.; Longhin, A.; Stanco, L.; Brugnera, R.; Carlin, R.; Garfagnini, A.; Limentani, S.; Raval, A.; Whitmore, J. J.; Iga, Y.; D'Agostini, G.; Marini, G.; Nigro, A.; Hart, J. C.; Abramowicz, H.; Ingbir, R.; Kananov, S.; Levy, A.; Stern, A.; Ishitsuka, M.; Kanno, T.; Kuze, M.; Maeda, J.; Hori, R.; Okazaki, N.; Shimizu, S.; Hamatsu, R.; Kitamura, S.; Ota, O.; Ri, Y. D.; Costa, M.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Sola, V.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Stewart, T. P.; Boutle, S. K.; Butterworth, J. M.; Jones, T. W.; Loizides, J. H.; Wing, M.; Brzozowska, B.; Ciborowski, J.; Grzelak, G.; Kulinski, P.; ?u?niak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Perlanski, W.; ?arnecki, A. F.; Adamus, M.; Plucinski, P.; Tymieniecka, T.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Brownson, E.; Reeder, D. D.; Savin, A. A.; Smith, W. H.; Wolfe, H.; Bhadra, S.; Catterall, C. D.; Hartner, G.; Noor, U.; Whyte, J.; ZEUS Collaboration

2010-05-01

6

Photoproduction of phi\\\\(1020\\\\) Mesons on the Proton at Large Momentum Transfer  

Microsoft Academic Search

The cross section for phi meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer -t = 4 GeV2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well described by Pomeron exchange. At large four-momentum transfer, above -t = 1.8 GeV2,

E. Anciant; T. Auger; G. Audit; M. Battaglieri; J. M. Laget; C. Marchand; G. S. Adams; M. J. Amaryan; M. Anghinolfi; D. Armstrong; B. Asavapibhop; H. Avakian; S. Barrow; K. Beard; M. Bektasoglu; B. L. Berman; N. Bianchi; A. Biselli; S. Boiarinov; W. J. Briscoe; W. K. Brooks; V. D. Burkert; J. R. Calarco; G. Capitani; D. S. Carman; B. Carnahan; C. Cetina; P. L. Cole; A. Coleman; J. Connelly; D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. Cummings; P. V. Degtyarneko; L. C. Dennis; E. de Sanctis; R. de Vita; K. S. Dhuga; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; M. Dugger; S. Dytman; Y. V. Efremenko; H. Egiyan; K. S. Egiyan; L. Elouadrhiri; L. Farhi; R. J. Feuerbach; J. Ficenec; T. A. Forest; A. Freyberger; H. Funsten; M. Gai; M. Garçon; G. P. Gilfoyle; K. Giovanetti; P. Girard; K. A. Griffioen; M. Guidal; V. Gyurjyan; D. Heddle; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; C. E. Hyde-Wright; M. M. Ito; D. Jenkins; K. Joo; M. Khandaker; D. H. Kim; W. Kim; A. Klein; F. J. Klein; M. Klusman; M. Kossov; L. H. Kramer; S. E. Kuhn; D. Lawrence; A. Longhi; K. Loukachine; R. Magahiz; R. W. Major; J. J. Manak; S. K. Matthews; S. McAleer; J. McCarthy; K. McCormick; J. W. McNabb; B. A. Mecking; M. D. Mestayer; C. A. Meyer; R. Minehart; R. Miskimen; V. Muccifora; J. Mueller; L. Murphy; G. S. Mutchler; J. Napolitano; R. A. Niyazov; A. Opper; J. T. O'Brien; S. Philips; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; B. M. Preedom; J. W. Price; L. M. Qin; B. A. Raue; A. R. Reolon; G. Riccardi; G. Ricco; M. Ripani; B. G. Ritchie; F. Ronchetti; P. Rossi; F. Roudot; D. Rowntree; P. D. Rubin; C. W. Salgado; V. Sapunenko; R. A. Schumacher; A. Shafi; Y. G. Sharabian; A. Skabelin; C. Smith; E. S. Smith; D. I. Sober; S. Stepanyan; P. Stoler; M. Taiuti; S. Taylor; D. Tedeschi; R. Thompson; M. F. Vineyard; A. Vlassov; H. Weller; L. B. Weinstein; R. Welsh; D. Weygand; S. Whisnant; M. Witkowski; E. Wolin; A. Yegneswaran; J. Yun; B. Zhang; J. Zhao

2000-01-01

7

Nuclear Transparency in Large Momentum Transfer Quasielastic Scattering  

SciTech Connect

We measured simultaneously pp elastic and quasielastic (p,thinsp2p) scattering in hydrogen, deuterium, and carbon for momentum transfers of 4.8 to 6.2 (GeV/c){sup 2} at incoming momenta of 5.9 and 7.5 GeV/c and center-of-mass scattering angles in the range {theta}{sub c.m.}=83.7{degree} {endash}90{degree} . The nuclear transparency is defined as the ratio of the quasielastic cross section to the free pp cross section. At incoming momentum of 5.9 GeV/c , the transparency of carbon decreases by a factor of 2 from {theta}{sub c.m.}{approx_equal}85{degree} to {theta}{sub c.m.}{approx_equal}89{degree} . At the largest angle the transparency of carbon increases from 5.9 to 7.5 GeV/c by more than 50{percent}. The transparency in deuterium does not depend on incoming momentum nor on {theta}{sub c.m.} . {copyright} {ital 1998} {ital The American Physical Society }

Mardor, I.; Aclander, J.; Alster, J.; Kosonovsky, E.; Mardor, Y.; Navon, I.; Piasetzky, E. [School of Physics and Astronomy, Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv 69978 (Israel); Durrant, S.; Barton, D.; Bunce, G.; Carroll, A.; Gushue, S.; Makdisi, Y.; Roser, T.; Tanaka, M. [Brookhaven National Laboratory, Upton, New York 11973 (United States); Christensen, N.; Courant, H.; Marshak, M.; White, C. [Physics Department, University of Minnesota, Minneapolis, Minnesota 55455 (United States); Heppelmann, S.; Minor, E.D.; Wu, J. [Physics Department, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Nicholson, H.; Sutton, C.S. [Mount Holyoke College, South Hadley, Massachusetts 01075 (United States); Russell, J. [Physics Department, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747 (United States)

1998-12-01

8

Photoproduction of ?\\(1020\\) Mesons on the Proton at Large Momentum Transfer  

NASA Astrophysics Data System (ADS)

The cross section for ? meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer -t = 4 GeV2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well described by Pomeron exchange. At large four-momentum transfer, above -t = 1.8 GeV2, the data support a model where the Pomeron is resolved into its simplest component, two gluons, which may couple to any quark in the proton and in the ?.

Anciant, E.; Auger, T.; Audit, G.; Battaglieri, M.; Laget, J. M.; Marchand, C.; Adams, G. S.; Amaryan, M. J.; Anghinolfi, M.; Armstrong, D.; Asavapibhop, B.; Avakian, H.; Barrow, S.; Beard, K.; Bektasoglu, M.; Berman, B. L.; Bianchi, N.; Biselli, A.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Burkert, V. D.; Calarco, J. R.; Capitani, G.; Carman, D. S.; Carnahan, B.; Cetina, C.; Cole, P. L.; Coleman, A.; Connelly, J.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J.; Degtyarneko, P. V.; Dennis, L. C.; de Sanctis, E.; de Vita, R.; Dhuga, K. S.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Efremenko, Y. V.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Farhi, L.; Feuerbach, R. J.; Ficenec, J.; Forest, T. A.; Freyberger, A.; Funsten, H.; Gai, M.; Garçon, M.; Gilfoyle, G. P.; Giovanetti, K.; Girard, P.; Griffioen, K. A.; Guidal, M.; Gyurjyan, V.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hicks, R. S.; Holtrop, M.; Hyde-Wright, C. E.; Ito, M. M.; Jenkins, D.; Joo, K.; Khandaker, M.; Kim, D. H.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Kramer, L. H.; Kuhn, S. E.; Lawrence, D.; Longhi, A.; Loukachine, K.; Magahiz, R.; Major, R. W.; Manak, J. J.; Matthews, S. K.; McAleer, S.; McCarthy, J.; McCormick, K.; McNabb, J. W.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Minehart, R.; Miskimen, R.; Muccifora, V.; Mueller, J.; Murphy, L.; Mutchler, G. S.; Napolitano, J.; Niyazov, R. A.; Opper, A.; O'Brien, J. T.; Philips, S.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Preedom, B. M.; Price, J. W.; Qin, L. M.; Raue, B. A.; Reolon, A. R.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, B. G.; Ronchetti, F.; Rossi, P.; Roudot, F.; Rowntree, D.; Rubin, P. D.; Salgado, C. W.; Sapunenko, V.; Schumacher, R. A.; Shafi, A.; Sharabian, Y. G.; Skabelin, A.; Smith, C.; Smith, E. S.; Sober, D. I.; Stepanyan, S.; Stoler, P.; Taiuti, M.; Taylor, S.; Tedeschi, D.; Thompson, R.; Vineyard, M. F.; Vlassov, A.; Weller, H.; Weinstein, L. B.; Welsh, R.; Weygand, D.; Whisnant, S.; Witkowski, M.; Wolin, E.; Yegneswaran, A.; Yun, J.; Zhang, B.; Zhao, J.

2000-11-01

9

Molecular-frame (e,2e) experiment for N2 at large momentum transfer  

NASA Astrophysics Data System (ADS)

We report molecular-frame (e,2e) cross sections for N2 at large momentum transfer, obtained using the electron-electron-fragment ion triple-coincidence technique. The measured angular distribution of the (e,2e) cross section for the inner-valence 2?g orbital appears to show that the spatial character of the orbital has been directly observed in momentum space. On the other hand, experimental results for ionization to states above the double-ionization threshold suggested a larger intensity in the direction perpendicular to the molecular axis rather than parallel, an observation that our plane-wave impulse-approximation calculations fail to reproduce.

Jones, D. B.; Yamazaki, M.; Watanabe, N.; Takahashi, M.

2013-02-01

10

Diffractive photoproduction of {rho} mesons with large momentum transfer at HERA  

SciTech Connect

The diffractive photoproduction of {rho} mesons with large momentum transfer, ep {yields} e{rho}Y, is studied at HERA in the kinematic range Q2 < 0.01 GeV2, 75 < W < 95 GeV, 1.5 < |t| < 10.0 GeV2 and MY < 5 GeV. The t dependence of the cross section is measured, as well as the spin density matrix elements. All results are compared to BFKL model predictions.

Gwilliam, Carl [School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL (United Kingdom)

2005-10-06

11

Photoproduction of the rho(0) meson on the proton at large momentum transfer.  

PubMed

The differential cross section, d sigma/dt, for rho(0) meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The rho(0) channel was extracted from the measured two charged-pion cross sections by fitting the pi(+)pi(-) and p pi(+) invariant masses. The low momentum transfer region shows the typical diffractive pattern expected from Reggeon exchange. The flatter behavior at large -t cannot be explained solely in terms of QCD-inspired two-gluon exchange models. The data indicate that other processes, like quark interchange, are important to fully describe rho photoproduction. PMID:11690264

Battaglieri, M; Anciant, E; Anghinolfi, M; De Vita, R; Golovach, E; Laget, J M; Mokeev, V; Ripani, M; Adams, G; Amaryan, M J; Armstrong, D S; Asavapibhop, B; Asryan, G; Audit, G; Auger, T; Avakian, H; Barrow, S; Beard, K; Bektasoglu, M; Berman, B L; Bianchi, N; Biselli, A S; Boiarinov, S; Branford, D; Briscoe, W J; Brooks, W K; Burkert, V D; Calarco, J R; Capitani, G P; Carman, D S; Carnahan, B; Cazes, A; Cetina, C; Cole, P L; Coleman, A; Cords, D; Corvisiero, P; Crabb, D; Crannell, H; Cummings, J P; DeSanctis, E; Degtyarenko, P V; Demirchyan, R; Denizli, H; Dennis, L; Dharmawardane, K V; Dhuga, K S; Djalali, C; Dodge, G E; Doughty, D; Dragovitsch, P; Dugger, M; Dytman, S; Eckhause, M; Egiyan, H; Egiyan, K S; Elouadrhiri, L; Farhi, L; Feuerbach, R J; Ficenec, J; Forest, T A; Freyberger, A P; Frolov, V; Funsten, H; Gaff, S J; Gai, M; Gilad, S; Gilfoyle, G P; Giovanetti, K L; Griffioen, K; Guidal, M; Guillo, M; Gyurjyan, V; Hancock, D; Hardie, J; Heddle, D; Hersman, F W; Hicks, K; Hicks, R S; Holtrop, M; Hyde-Wright, C E; Ito, M M; Joo, K; Kelley, J H; Khandaker, M; Kim, W; Klein, A; Klein, F J; Klusman, M; Kossov, M; Kramer, L H; Kuang, Y; Kuhn, S E; Lawrence, D; Lucas, M; Lukashin, K; Major, R W; Manak, J J; Marchand, C; McAleer, S; McCarthy, J; McNabb, J W; Mecking, B A; Mestayer, M D; Meyer, C A; Mikhailov, K; Minehart, R; Mirazita, M; Miskimen, R; Muccifora, V; Mueller, J; Mutchler, G S; Napolitano, J; Nelson, S O; Niczyporuk, B B; Niyazov, R A; O'Brien, J T; Opper, A K; Peterson, G; Philips, S A; Pivnyuk, N; Pocanic, D; Pogorelko, O; Polli, E; Preedom, B M; Price, J W; Protopopescu, D; Qin, L M; Raue, B A; Reolon, A R; Riccardi, G; Ricco, G; Ritchie, B G; Ronchetti, F; Rossi, P; Rowntree, D; Rubin, P D; Sabourov, K; Salgado, C; Sanzone-Arenhovel, M; Sapunenko, V; Schumacher, R A; Serov, V S; Shafi, A; Sharabian, Y G; Shaw, J; Skabelin, A V; Smith, E S; Smith, T; Smith, L C; Sober, D I; Spraker, M; Stavinsky, A; Stepanyan, S; Stoler, P; Taiuti, M; Taylor, S; Tedeschi, D J; Todor, L; Thompson, R; Vineyard, M F; Vlassov, A V; Weinstein, L B; Weisberg, A; Weller, H; Weygand, D P; Whisnant, C S; Wolin, E; Wood, M; Yegneswaran, A; Yun, J; Zhang, B; Zhao, J; Zhou, Z

2001-10-08

12

Photoproduction of the omega meson on the proton at large momentum transfer.  

PubMed

The differential cross section, dsigma/dt, for omega meson exclusive photoproduction on the proton above the resonance region (2.6momentum transfer -t=5 GeV2 using the CLAS detector at Jefferson Laboratory. The omega channel was identified by detecting a proton and pi(+) in the final state and using the missing mass technique. While the low momentum transfer region shows the typical diffractive pattern expected from Pomeron and Reggeon exchange, at large -t the differential cross section has a flat behavior. This feature can be explained by introducing quark interchange processes in addition to the QCD-inspired two-gluon exchange. PMID:12570539

Battaglieri, M; Brunoldi, M; De Vita, R; Laget, J M; Osipenko, M; Ripani, M; Taiuti, M; Adams, G; Amaryan, M J; Anciant, E; Anghinolfi, M; Armstrong, D S; Asavapibhop, B; Asryan, G; Audit, G; Auger, T; Avakian, H; Barrow, S; Beard, K; Bektasoglu, M; Berman, B L; Bersani, A; Bianchi, N; Biselli, A S; Boiarinov, S; Bouchigny, S; Bradford, R; Branford, D; Briscoe, W J; Brooks, W K; Burkert, V D; Calarco, J R; Capitani, G P; Carman, D S; Carnahan, B; Cazes, A; Cetina, C; Cole, P L; Coleman, A; Cords, D; Corvisiero, P; Crabb, D; Crannell, H; Cummings, J P; DeSanctis, E; Degtyarenko, P V; Demirchyan, R; Denizli, H; Dennis, L; Dharmawardane, K V; Dhuga, K S; Djalali, C; Dodge, G E; Doughty, D; Dragovitsch, P; Dugger, M; Dytman, S; Eckhause, M; Egiyan, H; Egiyan, K S; Elouadrhiri, L; Farhi, L; Feuerbach, R J; Ficenec, J; Forest, T A; Freyberger, A P; Frolov, V; Funsten, H; Gaff, S J; Gai, M; Garcon, M; Gavalian, G; Gilad, S; Gilfoyle, G P; Giovanetti, K L; Golovach, E; Griffioen, K; Guidal, M; Guillo, M; Guo, L; Gyurjyan, V; Hadjidakis, C; Hancock, D; Hardie, J; Heddle, D; Hersman, F W; Hicks, K; Hicks, R S; Holtrop, M; Hyde-Wright, C E; Ito, M M; Joo, K; Kelley, J H; Khandaker, M; Kim, W; Klein, A; Klein, F J; Klimenko, A V; Klusman, M; Kossov, M; Kramer, L H; Kuang, Y; Kuhn, S E; Lachniet, J; Lawrence, D; Lucas, M; Lukashin, K; Major, R W; Manak, J J; Marchand, C; McAleer, S; McCarthy, J; McNabb, J W C; Mecking, B A; Mestayer, M D; Meyer, C A; Mikhailov, K; Mirazita, M; Miskimen, R; Mokeev, V; Morrow, S; Mozer, M U; Muccifora, V; Mueller, J; Mutchler, G S; Napolitano, J; Nelson, S O; Niccolai, S; Niczyporuk, B B; Niyazov, R A; Nozar, M; O'Brien, J T; Opper, A K; Peterson, G; Philips, S A; Pivnyuk, N; Pocanic, D; Pogorelko, O; Polli, E; Preedom, B M; Price, J W; Protopopescu, D; Qin, L M; Raue, B A; Reolon, A R; Riccardi, G; Ricco, G; Ritchie, B G; Ronchetti, F; Rossi, P; Rowntree, D; Rubin, P D; Sabourov, K; Salgado, C; Sapunenko, V; Schumacher, R A; Serov, V S; Shafi, A; Sharabian, Y G; Shaw, J; Skabelin, A V; Smith, E S; Smith, T; Smith, L C; Sober, D I; Spraker, M; Stavinsky, A; Stepanyan, S; Stoler, P; Taylor, S; Tedeschi, D J; Todor, L; Thoma, U; Thompson, R; Vineyard, M F; Vlassov, A V; Wang, K; Weinstein, L B; Weller, H; Weygand, D P; Whisnant, C S; Wolin, E; Wood, M; Yegneswaran, A; Yun, J; Zhang, B; Zhao, J; Zhou, Z

2003-01-16

13

Photoproduction of the rho^0 Meson on the Proton at Large Momentum Transfer  

SciTech Connect

The differential cross section, d{sigma}/dt, for p0 meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The p0 channel was extracted from the measured two charged-pion cross sections by fitting the {pi}+{pi}- and p{pi}+ invariant masses. The low momentum transfer region shows the typical diffractive pattern expected from Reggeon exchange. The flatter behavior at large -t cannot be explained solely in terms of QCD-inspired two-gluon exchange models. The data indicate that other processes, like quark interchange, are important to fully describe p photoproduction.

M. Battaglieri; E. Anciant; M. Anghinolfi; R. De Vita; E. Golovach; J. M. Laget; V. Mokeev; M. Ripani; G. Adams; M. J. Amaryan; D. S. Armstrong; B. Asavapibhop; G. Asryan; G. Audit; T. Auger; H. Avakian; S. Barrow; K. Beard; M. Bektasoglu; B. L. Berman; N. Bianchi; A. S. Biselli; S. Boiarinov; D. Branford; W. J. Briscoe; W. K. Brooks; V. D. Burkert; J. R. Calarco; G. P. Capitani; D. S. Carman; B. Carnahan; A. Cazes; C. Cetina; P. L. Cole; A. Coleman; D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. P. Cummings; E. DeSanctis; P. V. Degtyarenko; R. Demirchyan; H. Denizli; L. Dennis; K. V. Dharmawardane; K. S. Dhuga; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; M. Dugger; S. Dytman; M. Eckhause; H. Egiyan; K. S. Egiyan; L. Elouadrhiri; L. Farhi; R. J. Feuerbach; J. Ficenec; T. A. Forest; A. P. Freyberger; V. Frolov; H. Funsten; S. J. Gaff; M. Gai; S. Gilad; G. P. Gilfoyle; K. L. Giovanetti; K. Griffioen; M. Guidal; M. Guillo; V. Gyurjyan; D. Hancock; J. Hardie; D. Heddle; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; C. E. Hyde-Wright; M. M. Ito; K. Joo; J. H. Kelley; M. Khandaker; W. Kim; A. Klein; F. J. Klein; M. Klusman; M. Kossov; L. H. Kramer; Y. Kuang; S. E. Kuhn; D. Lawrence; M. Lucas; K. Lukashin; R. W. Major; J. J. Manak; C. Marchand; S. McAleer; J. McCarthy; J. W. C. McNabb; B. A. Mecking; M. D. Mestayer; C. A. Meyer; K. Mikhailov; R. Minehart; M. Mirazita; R. Miskimen; V. Muccifora; J. Mueller; G. S. Mutchler; J. Napolitano; S. O. Nelson; B. B. Niczyporuk; R. A. Niyazov; J. T. O'Brien; A. K. Opper; G. Peterson; S. A. Philips; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; B. M. Preedom; J. W. Price; D. Protopopescu; L. M. Qin; B. A. Raue; A. R. Reolon; G. Riccardi; G. Ricco; B. G. Ritchie; F. Ronchetti; P. Rossi; D. Rowntree; P. D. Rubin; K. Sabourov; C. Salgado; M. Sanzone-Arenhovel; V. Sapunenko; R. A. Schumacher; V. S. Serov; A. Shafi; Y. G. Sharabian; J. Shaw; A. V. Skabelin; E. S. Smith; T. Smith; L. C. Smith; D. I. Sober; M. Spraker; A. Stavinsky; S. Stepanyan; P. Stoler; M. Taiuti; S. Taylor; D. J. Tedeschi; L. Todor; R. Thompson; M. F. Vineyard; A. V. Vlassov; L. B. Weinstein; A. Weisberg; H. Weller; D. P. Weygand; C. S. Whisnant; E. Wolin; M. Wood; A. Yegneswaran; J. Yun; B. Zhang; J. Zhao; Z. Zhou

2001-10-01

14

Photoproduction of the ? Meson on the Proton at Large Momentum Transfer  

NASA Astrophysics Data System (ADS)

The differential cross section, d?/dt, for ? meson exclusive photoproduction on the proton above the resonance region (2.6momentum transfer -t=5 GeV2 using the CLAS detector at Jefferson Laboratory. The ? channel was identified by detecting a proton and ?+ in the final state and using the missing mass technique. While the low momentum transfer region shows the typical diffractive pattern expected from Pomeron and Reggeon exchange, at large -t the differential cross section has a flat behavior. This feature can be explained by introducing quark interchange processes in addition to the QCD-inspired two-gluon exchange.

Battaglieri, M.; Brunoldi, M.; de Vita, R.; Laget, J. M.; Osipenko, M.; Ripani, M.; Taiuti, M.; Adams, G.; Amaryan, M. J.; Anciant, E.; Anghinolfi, M.; Armstrong, D. S.; Asavapibhop, B.; Asryan, G.; Audit, G.; Auger, T.; Avakian, H.; Barrow, S.; Beard, K.; Bektasoglu, M.; Berman, B. L.; Bersani, A.; Bianchi, N.; Biselli, A. S.; Boiarinov, S.; Bouchigny, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Burkert, V. D.; Calarco, J. R.; Capitani, G. P.; Carman, D. S.; Carnahan, B.; Cazes, A.; Cetina, C.; Cole, P. L.; Coleman, A.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J. P.; Desanctis, E.; Degtyarenko, P. V.; Demirchyan, R.; Denizli, H.; Dennis, L.; Dharmawardane, K. V.; Dhuga, K. S.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Eckhause, M.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Farhi, L.; Feuerbach, R. J.; Ficenec, J.; Forest, T. A.; Freyberger, A. P.; Frolov, V.; Funsten, H.; Gaff, S. J.; Gai, M.; Garcon, M.; Gavalian, G.; Gilad, S.; Gilfoyle, G. P.; Giovanetti, K. L.; Golovach, E.; Griffioen, K.; Guidal, M.; Guillo, M.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hancock, D.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hicks, R. S.; Holtrop, M.; Hyde-Wright, C. E.; Ito, M. M.; Joo, K.; Kelley, J. H.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A. V.; Klusman, M.; Kossov, M.; Kramer, L. H.; Kuang, Y.; Kuhn, S. E.; Lachniet, J.; Lawrence, D.; Lucas, M.; Lukashin, K.; Major, R. W.; Manak, J. J.; Marchand, C.; McAleer, S.; McCarthy, J.; McNabb, J. W.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mikhailov, K.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Morrow, S.; Mozer, M. U.; Muccifora, V.; Mueller, J.; Mutchler, G. S.; Napolitano, J.; Nelson, S. O.; Niccolai, S.; Niczyporuk, B. B.; Niyazov, R. A.; Nozar, M.; O'Brien, J. T.; Opper, A. K.; Peterson, G.; Philips, S. A.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Preedom, B. M.; Price, J. W.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Reolon, A. R.; Riccardi, G.; Ricco, G.; Ritchie, B. G.; Ronchetti, F.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabourov, K.; Salgado, C.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Skabelin, A. V.; Smith, E. S.; Smith, T.; Smith, L. C.; Sober, D. I.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stoler, P.; Taylor, S.; Tedeschi, D. J.; Todor, L.; Thoma, U.; Thompson, R.; Vineyard, M. F.; Vlassov, A. V.; Wang, K.; Weinstein, L. B.; Weller, H.; Weygand, D. P.; Whisnant, C. S.; Wolin, E.; Wood, M.; Yegneswaran, A.; Yun, J.; Zhang, B.; Zhao, J.; Zhou, Z.

2003-01-01

15

Double ionization of He by electron impact at large momentum transfer  

SciTech Connect

The double ionization of He by electron impact at 580 eV has been studied in a coplanar symmetric (e,(3-1)e) experiment, in which two fast electrons of 250 eV are detected. In this way a momentum transfer as large as 6 a.u. is achieved. The results are compared with the predictions of a theoretical model based on the impulse (knock-out) approximation. The calculations, which include radial correlation of electrons in the He ground state wave function, better describe the experiment than those with an uncorrelated wave function.

Bolognesi, P.; Jia, C.C.; Avaldi, L.; Lahmam-Bennani, A.; Kouzakov, K.A.; Popov, Yu.V. [CNR-IMIP, Area della Ricerca di Roma 1, 00016 Monterotondo Scalo (Italy); LCAM, UMR 8625, Batiment 351, Universite de Paris XI, F-91405 Orsay Cedex (France); Max-Planck-Institut fuer Mikrostrukturphysik, Weinberg 2, D-06120 Halle (Germany); Nuclear Physics Institute, Moscow State University, Moscow 119899 (Russian Federation)

2003-03-01

16

Excitation of heavy hydrogenlike ions by light atoms in relativistic collisions with large momentum transfers  

NASA Astrophysics Data System (ADS)

We present a theory for excitation of heavy hydrogenlike projectile ions by light target atoms in collisions where the momentum transfers to the atom are very large on the atomic scale. It is shown that in this process the electrons and the nucleus of the atom behave as (quasi-) free particles with respect to each other and that their motion is governed by the field of the nucleus of the ion. The effect of this field on the atomic particles can be crucial for the contribution to the excitation of the ion caused by the electrons of the atom but, because of large nuclear mass, may be neglected in the contribution to the excitation due to the nucleus of the atom. The theory is applied to calculate excitation of Bi82+(1s) ions in collisions with hydrogen.

Najjari, B.; Voitkiv, A. B.

2012-05-01

17

Large Momentum Transfer ed Elastic Scattering and the Structure of the Deuteron  

NASA Astrophysics Data System (ADS)

The deuteron, as the only A = 2 nucleus, is a primary test case for microscopic models of nuclear structure. Elastic electron-deuteron scattering measures the ground-state structure, allowing a test of models to high momentum transfers and short ranges. New high-precision results are available from two Jefferson Laboratory experiments, made possible by the combination of a high-intensity continuous electron beam and high-power cryotargets. The Hall A collaboration has measured the deuteron A structure function to a four-momentum transfer of 6 (GeV/c)^2, and has reduced uncertainties in the B structure function at lower momentum transfer. The t_20 collaboration used the deuteron polarimeter POLDER to extend polarization measurements to a four-momentum transfer of nearly 2 (GeV/c)^2, allowing the charge, magnetic, and quadrupole form factors to be extracted. At the larger momentum transfers, corresponding to shorter internucleonic distances, one may look for a breakdown in the standard nonrelativistic and relativistic meson-baryon models, and perhaps the applicability of QCD-inspired models of the deuteron structure.

Gilman, Ronald

1998-11-01

18

Photoproduction of the omega Meson on the Proton at Large Momentum Transfer  

Microsoft Academic Search

The differential cross section, dsigma\\/dt, for omega meson exclusive photoproduction on the proton above the resonance region (2.6momentum transfer -t=5 GeV2 using the CLAS detector at Jefferson Laboratory. The omega channel was identified by detecting a proton and pi+ in the final state and using the missing mass technique. While the low momentum

M. Battaglieri; M. Brunoldi; R. de Vita; J. M. Laget; M. Osipenko; M. Ripani; M. Taiuti; G. Adams; M. J. Amaryan; E. Anciant; M. Anghinolfi; D. S. Armstrong; B. Asavapibhop; G. Asryan; G. Audit; T. Auger; H. Avakian; S. Barrow; K. Beard; M. Bektasoglu; B. L. Berman; A. Bersani; N. Bianchi; A. S. Biselli; S. Boiarinov; S. Bouchigny; R. Bradford; D. Branford; W. J. Briscoe; W. K. Brooks; V. D. Burkert; J. R. Calarco; G. P. Capitani; D. S. Carman; B. Carnahan; A. Cazes; C. Cetina; P. L. Cole; A. Coleman; D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. P. Cummings; E. Desanctis; P. V. Degtyarenko; R. Demirchyan; H. Denizli; L. Dennis; K. V. Dharmawardane; K. S. Dhuga; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; M. Dugger; S. Dytman; M. Eckhause; H. Egiyan; K. S. Egiyan; L. Elouadrhiri; L. Farhi; R. J. Feuerbach; J. Ficenec; T. A. Forest; A. P. Freyberger; V. Frolov; H. Funsten; S. J. Gaff; M. Gai; M. Garcon; G. P. Gilfoyle; S. Gilad; K. L. Giovanetti; E. Golovach; K. Griffioen; M. Guidal; M. Guillo; L. Guo; V. Gyurjyan; C. Hadjidakis; D. Hancock; J. Hardie; D. Heddle; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; C. E. Hyde-Wright; M. M. Ito; K. Joo; J. H. Kelley; M. Khandaker; W. Kim; A. Klein; F. J. Klein; A. V. Klimenko; M. Klusman; M. Kossov; L. H. Kramer; Y. Kuang; S. E. Kuhn; J. Lachniet; D. Lawrence; M. Lucas; K. Lukashin; R. W. Major; J. J. Manak; C. Marchand; S. McAleer; J. McCarthy; J. W. McNabb; B. A. Mecking; M. D. Mestayer; C. A. Meyer; K. Mikhailov; M. Mirazita; R. Miskimen; V. Mokeev; S. Morrow; M. U. Mozer; V. Muccifora; J. Mueller; G. S. Mutchler; J. Napolitano; S. O. Nelson; S. Niccolai; B. B. Niczyporuk; R. A. Niyazov; M. Nozar; J. T. O'Brien; A. K. Opper; G. Peterson; S. A. Philips; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; B. M. Preedom; J. W. Price; D. Protopopescu; L. M. Qin; B. A. Raue; A. R. Reolon; G. Riccardi; G. Ricco; B. G. Ritchie; F. Ronchetti; P. Rossi; D. Rowntree; P. D. Rubin; K. Sabourov; C. Salgado; V. Sapunenko; R. A. Schumacher; V. S. Serov; A. Stavinsky; Y. G. Sharabian; J. Shaw; A. V. Skabelin; E. S. Smith; T. Smith; L. C. Smith; D. I. Sober; M. Spraker; S. Stepanyan; P. Stoler; S. Taylor; D. J. Tedeschi; L. Todor; U. Thoma; R. Thompson; M. F. Vineyard; A. V. Vlassov; K. Wang; L. B. Weinstein; H. Weller; D. P. Weygand; C. S. Whisnant; E. Wolin; M. Wood; A. Yegneswaran; J. Yun; B. Zhang; J. Zhao; Z. Zhou

2003-01-01

19

Diffractive J/{Psi} photoproduction at large momentum transfer in coherent hadron-hadron interactions at CERN LHC  

SciTech Connect

The vector meson production in coherent hadron-hadron interactions at LHC energies is studied assuming that the color singlet t-channel exchange carries large momentum transfer. We consider the nonforward solution of the Balitsky, Fadin, Kuraev, and Lipatov equation at high energy and large momentum transfer and estimate the rapidity distribution and total cross section for the process h{sub 1}h{sub 2{yields}}h{sub 1}J/{Psi}X, where h{sub i} can be a proton or a nucleus. We predict large rates, which implies that the experimental identification can be feasible at the LHC.

Goncalves, V. P.; Sauter, W. K. [High and Medium Energy Group (GAME), Instituto de Fisica e Matematica, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-900, Pelotas, RS (Brazil)

2010-04-01

20

Diffractive J/{Psi} photoproduction at large momentum transfer in coherent hadron-hadron interactions at CERN LHC  

SciTech Connect

The vector meson production in coherent hadron-hadron interactions at LHC energies is addressed assuming that the color singlet t-channel exchange carries large momentum transfer. We consider the non-forward solution of the BFKL equation at high energy and large momentum transfer and estimate the rapidity distribution and total cross section for the process h{sub 1}h{sub 2{yields}}h{sub 1}J/{Psi}X, where h{sub i} can be a proton or a nucleus. We predict large rates, which implies that the experimental identification could be feasible at the LHC.

Sauter, W. K.; Goncalves, V. P. [High and Medium Energy Group (GAME), Instituto de Fisica e Matematica, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-900, Pelotas, RS (Brazil)

2010-11-12

21

Photoproduction of the rho0 Meson on the Proton at Large Momentum Transfer  

Microsoft Academic Search

The differential cross section, dsigma\\/dt, for rho0 meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The rho0 channel was extracted from the measured two charged-pion cross sections by fitting the pi+pi- and ppi+ invariant masses. The low

M. Battaglieri; E. Anciant; M. Anghinolfi; R. de Vita; E. Golovach; J. M. Laget; V. Mokeev; M. Ripani; G. Adams; M. J. Amaryan; D. S. Armstrong; B. Asavapibhop; G. Asryan; G. Audit; T. Auger; H. Avakian; S. Barrow; K. Beard; M. Bektasoglu; B. L. Berman; N. Bianchi; A. S. Biselli; S. Boiarinov; D. Branford; W. J. Briscoe; W. K. Brooks; V. D. Burkert; J. R. Calarco; G. P. Capitani; D. S. Carman; B. Carnahan; A. Cazes; C. Cetina; P. L. Cole; A. Coleman; D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. P. Cummings; E. Desanctis; P. V. Degtyarenko; R. Demirchyan; H. Denizli; L. Dennis; K. V. Dharmawardane; K. S. Dhuga; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; M. Dugger; S. Dytman; M. Eckhause; H. Egiyan; K. S. Egiyan; L. Elouadrhiri; L. Farhi; R. J. Feuerbach; J. Ficenec; T. A. Forest; A. P. Freyberger; V. Frolov; H. Funsten; S. J. Gaff; M. Gai; S. Gilad; G. P. Gilfoyle; K. L. Giovanetti; K. Griffioen; M. Guidal; M. Guillo; V. Gyurjyan; D. Hancock; J. Hardie; D. Heddle; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; C. E. Hyde-Wright; M. M. Ito; K. Joo; J. H. Kelley; M. Khandaker; W. Kim; A. Klein; F. J. Klein; M. Klusman; M. Kossov; L. H. Kramer; Y. Kuang; S. E. Kuhn; D. Lawrence; M. Lucas; K. Lukashin; R. W. Major; J. J. Manak; C. Marchand; S. McAleer; J. McCarthy; J. W. McNabb; B. A. Mecking; M. D. Mestayer; C. A. Meyer; K. Mikhailov; R. Minehart; M. Mirazita; R. Miskimen; V. Muccifora; J. Mueller; G. S. Mutchler; J. Napolitano; S. O. Nelson; B. B. Niczyporuk; R. A. Niyazov; J. T. O'Brien; A. K. Opper; G. Peterson; S. A. Philips; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; B. M. Preedom; J. W. Price; D. Protopopescu; L. M. Qin; B. A. Raue; A. R. Reolon; G. Riccardi; G. Ricco; B. G. Ritchie; F. Ronchetti; P. Rossi; D. Rowntree; P. D. Rubin; K. Sabourov; C. Salgado; M. Sanzone-Arenhovel; V. Sapunenko; R. A. Schumacher; V. S. Serov; A. Shafi; Y. G. Sharabian; J. Shaw; A. V. Skabelin; E. S. Smith; T. Smith; L. C. Smith; D. I. Sober; M. Spraker; A. Stavinsky; S. Stepanyan; P. Stoler; M. Taiuti; S. Taylor; D. J. Tedeschi; L. Todor; R. Thompson; M. F. Vineyard; A. V. Vlassov; L. B. Weinstein; A. Weisberg; H. Weller; D. P. Weygand; C. S. Whisnant; E. Wolin; M. Wood; A. Yegneswaran; J. Yun; B. Zhang; J. Zhao; Z. Zhou

2001-01-01

22

Measurement of Tensor Polarization in Elastic Electron-Deuteron Scattering at Large Momentum Transfer  

SciTech Connect

Tensor polarization observables (t20, t21 and t22) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c) 2. The experiment was performed at the Jefferson Laboratory in Hall C using the electron HMS Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to much larger Q 2 the deuteron charge form factors GC and GQ. They are in good agreement with relativistic calculations and disagree with pQCD predictions.

David Abbott; A. Ahmidouch; H. Anklin; J. Arvieux; J. Ball; S. Beedoe; E.J. Beise; L. Bimbot; W. Boeglin; H. Breuer; R. Carlini; N.S. Chant; S. Danagoulian; K. Dow; J.-E. Ducret; J. Dunne; L. Ewell; L. Eyraud; C. Furget; M. Garcon; R. Gilman; C. Glashausser; P. Gueye; K. Gustafsson; K. Hadi; A. Honegger; J. Jourdan; S. Kox; G. Kumbartzki; L. Lu; A. Lung; D. Mack; P. Markowitz; J. McIntyre; D. Meekins; F. Merchez; J. Mitchell; R. Mohring; S. Mtingwa; H. Mrktchyan; D. Pitz; L. Qin; R.D. Ransome; J.-S. Real; P.G. Roos; P. Rutt; R. Sawafta; S. Stepanyan; R. Tieulent; E. Tomasi-Gustafsson; W. Turchinetz; K. Vansyoc; J. Volmer; E. Voutier; W. Vulcan; C. Williamson; S.A. Wood; C. Yan; J. Zhao; W. Zhao

2000-05-01

23

Measurement of Tensor Polarization in Elastic Electron-Deuteron Scattering at Large Momentum Transfer  

SciTech Connect

Tensor polarization observables (t20, t21 and t22) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c){sup 2}. The experiment was performed at the Jefferson Laboratory in Hall C using the electron HMS Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to much larger Q{sup 2} the deuteron charge form factors G{sub C} and G{sub Q}. They are in good agreement with relativistic calculations and disagree with pQCD predictions.

David Abbott; Abdellah Ahmidouch; Heinz Anklin; Francois Arvieux; Jacques Ball; S. Beedoe; Elizabeth Beise; Louis Bimbot; Werner Boeglin; Herbert Breuer; Roger Carlini; Nicholas Chant; Samuel Danagoulian; K. Dow; Jean-Eric Ducret; James Dunne; Lars Ewell; Laurent Eyraud; Christophe Furget; Michel Garcon; Ronald Gilman; Charles Glashausser; Paul Gueye; Kenneth Gustafsson; Kawtar Hafidi; Adrian Honegger; Juerg Jourdan; Serge Kox; Gerfried Kumbartzki; L. Lu; Allison Lung; David Mack; Pete Markowitz; Justin McIntyre; David Meekins; Fernand Merchez; Joseph Mitchell; R. Mohring; Sekazi Mtingwa; Hamlet Mkrtchyan; David Pitz; Liming Qin; Ronald Ransome; Jean-Sebastien Real; Philip Roos; Paul Rutt; Reyad Sawafta; Samuel Stepanyan; Raphael Tieulent; Egle Tomasi-Gustafsson; William Turchinetz; Kelley Vansyoc; Jochen Volmer; Eric Voutier; William Vulcan; Claude Williamson; Stephen Wood; Chen Yan; Jie Zhao; Wenxia Zhao

2000-05-01

24

Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP  

Microsoft Academic Search

The evolution of the electromagnetic coupling, ?, in the momentum-transfer range 1800 GeV2?Q221600 GeV2 is studied with about 40?000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies s=189–209 GeV. The running of ? is parametrised as: ?(Q2)=?01?C??(Q2), where ?0??(Q2=0) is the fine-structure constant and C=1 corresponds to the evolution expected in QED. A fit to the differential cross section

P. Achard; O. Adriani; M. Aguilar-Benitez; J. Alcaraz; G. Alemanni; J. Allaby; A. Aloisio; M. G. Alviggi; H. Anderhub; V. P. Andreev; F. Anselmo; A. Arefiev; T. Azemoon; P. Bagnaia; A. Bajo; G. Baksay; L. Baksay; S. V. Baldew; S. Banerjee; Sw. Banerjee; A. Barczyk; R. Barillère; P. Bartalini; M. Basile; N. Batalova; R. Battiston; A. Bay; F. Becattini; U. Becker; F. Behner; L. Bellucci; R. Berbeco; J. Berdugo; P. Berges; B. Bertucci; M. Biasini; M. Biglietti; A. Biland; J. J. Blaising; S. C. Blyth; G. J. Bobbink; A. Böhm; L. Boldizsar; B. Borgia; S. Bottai; D. Bourilkov; M. Bourquin; S. Braccini; J. G. Branson; F. Brochu; J. D. Burger; W. J. Burger; X. D. Cai; M. Capell; G. Cara Romeo; A. Cartacci; J. Casaus; F. Cavallari; N. Cavallo; C. Cecchi; M. Cerrada; Y. H. Chang; M. Chemarin; A. Chen; G. Chen; H. F. Chen; H. S. Chen; G. Chiefari; L. Cifarelli; F. Cindolo; I. Clare; G. Coignet; N. Colino; S. Costantini; B. de la Cruz; S. Cucciarelli; R. de Asmundis; P. Déglon; J. Debreczeni; A. Degré; K. Dehmelt; D. della Volpe; E. Delmeire; P. Denes; F. DeNotaristefani; A. De Salvo; M. Diemoz; M. Dierckxsens; C. Dionisi; M. Dittmar; A. Doria; M. T. Dova; D. Duchesneau; M. Duda; B. Echenard; A. Eline; A. El Hage; H. El Mamouni; A. Engler; F. J. Eppling; P. Extermann; M. A. Falagan; S. Falciano; A. Favara; J. Fay; O. Fedin; M. Felcini; T. Ferguson; H. Fesefeldt; E. Fiandrini; J. H. Field; F. Filthaut; P. H. Fisher; W. Fisher; I. Fisk; G. Forconi; K. Freudenreich; C. Furetta; Yu. Galaktionov; S. N. Ganguli; P. Garcia-Abia; M. Gataullin; S. Gentile; Z. F. Gong; G. Grenier; O. Grimm; M. W. Gruenewald; M. Guida; V. K. Gupta; A. Gurtu; L. J. Gutay; D. Haas; D. Hatzifotiadou; T. Hebbeker; A. Hervé; J. Hirschfelder; H. Hofer; M. Hohlmann; G. Holzner; S. R. Hou; B. N. Jin; P. Jindal; L. W. Jones; P. de Jong; I. Josa-Mutuberría; M. Kaur; M. N. Kienzle-Focacci; J. K. Kim; J. Kirkby; W. Kittel; A. Klimentov; M. Kopal; V. Koutsenko; M. Kräber; R. W. Kraemer; A. Krüger; P. Ladron de Guevara; I. Laktineh; G. Landi; M. Lebeau; A. Lebedev; P. Lebrun; P. Lecomte; P. Le Coultre; J. M. Le Goff; R. Leiste; M. Levtchenko; P. Levtchenko; C. Li; S. Likhoded; C. H. Lin; W. T. Lin; F. L. Linde; Z. A. Liu; W. Lohmann; E. Longo; Y. S. Lu; C. Luci; L. Luminari; W. Lustermann; W. G. Ma; L. Malgeri; A. Malinin; C. Maña; J. Mans; J. P. Martin; F. Marzano; K. Mazumdar; R. R. McNeil; S. Mele; L. Merola; M. Meschini; W. J. Metzger; A. Mihul; H. Milcent; G. Mirabelli; J. Mnich; G. B. Mohanty; G. S. Muanza; A. J. M. Muijs; B. Musicar; M. Musy; S. Nagy; S. Natale; M. Napolitano; F. Nessi-Tedaldi; H. Newman; A. Nisati; T. Novak; H. Nowak; R. Ofierzynski; G. Organtini; I. Pal; C. Palomares; P. Paolucci; R. Paramatti; G. Passaleva; S. Patricelli; T. Paul; M. Pauluzzi; C. Paus; F. Pauss; M. Pedace; S. Pensotti; D. Perret-Gallix; F. Pierella; M. Pioppi; P. A. Piroué; E. Pistolesi; V. Plyaskin; M. Pohl; V. Pojidaev; J. Pothier; D. Prokofiev; G. Rahal-Callot; M. A. Rahaman; P. Raics; N. Raja; R. Ramelli; P. G. Rancoita; R. Ranieri; A. Raspereza; P. Razis; D. Ren; M. Rescigno; S. Reucroft; S. Reucroft; K. Riles; B. P. Roe; L. Romero; A. Rosca; C. Rosemann; C. Rosenbleck; S. Rosier-Lees; J. A. Rubio; G. Ruggiero; H. Rykaczewski; A. Sakharov; S. Saremi; J. Salicio; E. Sanchez; C. Schäfer; V. Schegelsky; H. Schopper; D. J. Schotanus; C. Sciacca; L. Servoli; S. Shevchenko; N. Shivarov; V. Shoutko; E. Shumilov; A. Shvorob; D. Son; C. Souga; P. Spillantini; M. Steuer; D. P. Stickland; B. Stoyanov; A. Straessner; K. Sudhakar; G. Sultanov; L. Z. Sun; S. Sushkov; H. Suter; J. D. Swain; Z. Szillasi; X. W. Tang; P. Tarjan; L. Tauscher; B. Tellili; D. Teyssier; C. Timmermans; Samuel C. C. Ting; S. M. Ting; S. C. Tonwar; J. Tóth; C. Tully; K. L. Tung; J. Ulbricht; E. Valente; R. T. Van de Walle; R. Vasquez; V. Veszpremi; G. Vesztergombi; I. Vetlitsky; G. Viertel; S. Villa; M. Vivargent; S. Vlachos; I. Vodopianov; H. Vogel; H. Vogel; I. Vorobiev; A. A. Vorobyov; M. Wadhwa; Q. Wang; X. L. Wang; Z. M. Wang; Z. M. Wang; S. Wynhoff; L. Xia; Z. Z. Xu; J. Yamamoto; B. Z. Yang; C. G. Yang; H. J. Yang; M. Yang; S. C. Yeh; An. Zalite; Yu. Zalite; Z. P. Zhang; J. Zhao; G. Y. Zhu; R. Y. Zhu; H. L. Zhuang; A. Zichichi; B. Zimmermann; M. Zöller

2005-01-01

25

Measurement of the Electric and Magnetic Elastic Structure Functions of the Deuteron at Large Momentum Transfers  

SciTech Connect

The deuteron elastic structure functions, A(Q{sup 2}) and B(Q{sup 2}), have been extracted from cross section measurements of elastic electron-deuteron scattering in coincidence using the Continuous Electron Beam Accelerator and Hall A Facilities of Jefferson Laboratory. Incident electrons were scattered off a high-power cryogenic deuterium target. Scattered electrons and recoil deuterons were detected in the two High Resolution Spectrometers of Hall A. A(Q{sup 2}) was extracted from forward angle cross section measurements in the squared four-momentum transfer range 0.684 ? Q{sup 2} ? 5.90 (GeV/c){sup 2}. B(Q{sup 2}) was determined by means of a Rosenbluth separation in the range 0.684 ? Q{sup 2} ? 1.325 (GeV/c){sup 2}. The data are compared to theoretical models based on the impulse approximation with the inclusion of meson-exchange currents and to predictions of quark dimensional scaling and perturbative quantum chromodynamics. The results are expected to provide insights into the transition from meson-nucleon to quark-gluon descriptions of the nuclear two-body system.

Riad Suleiman

1999-10-01

26

Electron-impact ionization of the water molecule at large momentum transfer above the double-ionization threshold  

NASA Astrophysics Data System (ADS)

The single and double ionization of the water molecule at large momentum transfer has been studied using a combination of (e,2e) and (e,3-1e) spectroscopy, with the binding energy spectrum being measured from 0 to 100 eV. The experiment has been performed in the symmetric noncoplanar geometry at an incident electron energy of 2055 eV. In this way we have achieved a large momentum transfer of 9 a.u. In particular, we present an observation of a relatively intense band at around 58 eV. Symmetry-adapted cluster configuration interaction (SAC-CI) general-R calculations for single ionization indicate that the observed band is at least partly generated by a cluster of satellites with small intensities, which predominantly belong to states possessing 2A1 symmetry originating from the mixing of the (2a1)-1 state with two electron processes. Nevertheless, it has been found that the entire spectrum above the lowest double-ionization threshold cannot be understood, even qualitatively, with the SAC-CI calculations. This result suggests that the (e,3-1e) double-ionization processes have a significant contribution to the observations.

Jones, D. B.; Yamazaki, M.; Watanabe, N.; Takahashi, M.

2011-01-01

27

Momentum Transfer within Canopies  

Microsoft Academic Search

To understand the basic characteristics of the observed S-shaped wind profile and the exponential flux profile within forest canopies, three hypotheses are postulated. The relationship between these fundamental profiles is well established by combining the postulated hypotheses with momentum equations. Robust agreements between theoretical predictions and observations indicate that the nature of momentum trans- fer within canopies can be well

Chuixiang Yi

2008-01-01

28

Momentum transfer in complex plasmas  

NASA Astrophysics Data System (ADS)

Momentum transfer in complex plasmas (systems consisting of ions, electrons, neutrals, and charged macroscopic grains) is investigated assuming an interaction potential between the charged species of the screened Coulomb (Yukawa) type. Momentum transfer cross sections and rates are derived. Applications of the results are discussed; in particular, we classify the possible states of complex plasmas in terms of the momentum transfer due to grain-grain collisions and its competition with that due to interaction with the surrounding medium. The resulting phase diagrams are presented.

Khrapak, Sergey A.; Ivlev, Alexey V.; Morfill, Gregor E.

2004-11-01

29

Quasielastic (e,e{prime}p) scattering at large momentum transfer  

SciTech Connect

Coincidence cross sections for (e, e{prime} p) quasi-elastic scattering were measured at CEBAF with high statistical precision for C, Fe, and Au targets for 0.6 < Q{sup 2} < 3.3 GeV{sup 2}. Missing energy and missing momentum distributions obtained from a preliminary analysis are in reasonable agreement with prior data from SLAC. The preliminary results are compared with a PWIA calculation to determine the nuclear transparency as a function of Q{sup 2} and A. At both A{sup 2} = 0.6 and Q{sup 2} = 1.8 GeV{sup 2} data were taken to perform a Rosenbluth separation to extract the longitudinal and transverse cross sections. The preliminary missing-energy distributions of the forward and backward angle measurements do not indicate an obvious excess of transverse strength.

Ent, R.; Abbott, D.; Dunne, J. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)] [and others

1997-08-01

30

Angular Momentum Transfer in a Protolunar Disk  

NASA Astrophysics Data System (ADS)

We numerically calculated angular momentum transfer processes in a dense particulate disk within the Roche limit by global N-body simulations, up to N=105, for parameters corresponding to a protolunar disk generated by a giant impact on a proto-Earth. In the simulations, both self-gravity and inelastic physical collisions are included. We first formalized expressions for angular momentum transfer rate including self-gravity and calculated the transfer rate with the results of our N-body simulations. Spiral structure is formed within the Roche limit by self-gravity and energy dissipation of inelastic collisions, and angular momentum is effectively transferred outward. Angular momentum transfer is dominated by both gravitational torque due to the spiral structure and particles' collective motion associated with the structure. Since formation and evolution of the spiral structure is regulated by the disk surface density, the angular momentum transfer rate depends on surface density, but not on particle size or number, so that the timescale of evolution of a particulate disk is independent of the number of particles (N) that is used to represent the disk, if N is large enough to represent the spiral structure. With N=105, the detailed spiral structure is resolved, while it is only poorly resolved with N=103; however, we found that calculated angular momentum transfer does not change as long as N>~103.

Takeda, Takaaki; Ida, Shigeru

2001-10-01

31

Transfer Coefficients of Momentum, Heat and Water Vapour in the Atmospheric Surface Layer of a Large Freshwater Lake  

NASA Astrophysics Data System (ADS)

In studies of lake-atmosphere interactions, the fluxes of momentum, water vapour and sensible heat are often parametrized as being proportional to the differences in wind, humidity and air temperature between the water surface and a reference height above the surface. Here, the proportionality via transfer coefficients in these relationships was investigated with the eddy-covariance method at three sites within an eddy-covariance mesonet across Lake Taihu, China. The results indicate that the transfer coefficients decreased with increasing wind speed for weak winds and approached constant values for strong winds. The presence of submerged macrophytes reduced the momentum transfer (drag) coefficient significantly. At the two sites free of submerged macrophytes, the 10-m drag coefficients under neutral stability were 1.8 and at the wind speed of , which are 38 and 34 % greater than the prediction by the Garratt model for the marine environment.

Xiao, Wei; Liu, Shoudong; Wang, Wei; Yang, Dong; Xu, Jiaping; Cao, Chang; Li, Hanchao; Lee, Xuhui

2013-09-01

32

Inelastic Electron-Proton Scattering at Large Momentum Transfers and the Inelastic Structure Functions of the Proton  

Microsoft Academic Search

Differential cross sections for electrons scattered inelastically from hydrogen have been measured at 18°, 26°, and 34°. The range of incident energy was 4.5 to 18 GeV, and the range of four-momentum transfer squared was 1.5 to 21 (GeVc)2. With the use of these data in conjunction with previously measured data at 6° and 10°, the contributions from the longitudinal

G. Miller; E. D. Bloom; G. Buschhorn; D. H. Coward; H. Destaebler; J. Drees; C. L. Jordan; L. W. Mo; R. E. Taylor; J. I. Friedman; G. C. Hartmann; H. W. Kendall; R. Verdier

1972-01-01

33

Measurements of the meson-photon transition form factors of light pseudoscalar mesons at large momentum transfer  

Microsoft Academic Search

Using the CLEO II detector, we have measured the differential cross sections for exclusive two-photon production of light pseudoscalar mesons pi0, eta, and eta'. From our measurements we have obtained the form factors associated with the electromagnetic transitions gamma*gamma-->meson. We have measured these form factors in the momentum transfer ranges from 1.5 to 9, 20, and 30 GeV2 for pi0,

J. Gronberg; T. S. Hill; R. Kutschke; D. J. Lange; S. Menary; R. J. Morrison; H. N. Nelson; T. K. Nelson; C. Qiao; J. D. Richman; D. Roberts; A. Ryd; M. S. Witherell; R. Balest; B. H. Behrens; W. T. Ford; J. Roy; J. G. Smith; J. P. Alexander; C. Bebek; B. E. Berger; K. Berkelman; K. Bloom; D. G. Cassel; H. A. Cho; D. M. Coffman; D. S. Crowcroft; M. Dickson; P. S. Drell; K. M. Ecklund; R. Ehrlich; R. Elia; A. D. Foland; P. Gaidarev; R. S. Galik; B. Gittelman; S. W. Gray; D. L. Hartill; B. K. Heltsley; P. I. Hopman; J. Kandaswamy; P. C. Kim; D. L. Kreinick; T. Lee; Y. Liu; G. S. Ludwig; J. Masui; J. Mevissen; N. B. Mistry; C. R. Ng; E. Nordberg; M. Ogg; J. R. Patterson; D. Peterson; D. Riley; A. Soffer; B. Valant-Spaight; C. Ward; M. Athanas; P. Avery; C. D. Jones; M. Lohner; C. Prescott; J. Yelton; J. Zheng; G. Brandenburg; R. A. Briere; Y. S. Gao; D. Y.-J. Kim; R. Wilson; H. Yamamoto; T. E. Browder; F. Li; Y. Li; J. L. Rodriguez; T. Bergfeld; B. I. Eisenstein; J. Ernst; G. E. Gladding; G. D. Gollin; R. M. Hans; E. Johnson; I. Karliner; M. A. Marsh; M. Palmer; M. Selen; J. J. Thaler; K. W. Edwards; A. Bellerive; R. Janicek; D. B. Macfarlane; K. W. McLean; P. M. Patel; A. J. Sadoff; R. Ammar; P. Baringer; A. Bean; D. Besson; D. Coppage; C. Darling; R. Davis; N. Hancock; S. Kotov; I. Kravchenko; N. Kwak; S. Anderson; Y. Kubota; M. Lattery; S. J. Lee; J. J. O'neill; S. Patton; R. Poling; T. Riehle; V. Savinov; A. Smith; M. S. Alam; S. B. Athar; Z. Ling; A. H. Mahmood; H. Severini; S. Timm; F. Wappler; A. Anastassov; S. Blinov; J. E. Duboscq; K. D. Fisher; D. Fujino; K. K. Gan; T. Hart; K. Honscheid; H. Kagan; R. Kass; J. Lee; M. B. Spencer; M. Sung; A. Undrus; R. Wanke; A. Wolf; M. M. Zoeller; B. Nemati; S. J. Richichi; W. R. Ross; P. Skubic; M. Bishai; J. Fast; E. Gerndt; J. W. Hinson; N. Menon; D. H. Miller; E. I. Shibata; I. P. Shipsey; M. Yurko; L. Gibbons; S. Glenn; S. D. Johnson; Y. Kwon; S. Roberts; E. H. Thorndike; C. P. Jessop; K. Lingel; H. Marsiske; M. L. Perl; D. Ugolini; R. Wang; X. Zhou; T. E. Coan; V. Fadeyev; I. Korolkov; Y. Maravin; I. Narsky; V. Shelkov; J. Staeck; R. Stroynowski; I. Volobouev; J. Ye; M. Artuso; A. Efimov; F. Frasconi; M. Gao; M. Goldberg; D. He; S. Kopp; G. C. Moneti; S. Schuh; T. Skwarnicki; S. Stone; G. Viehhauser; X. Xing; J. Bartelt; S. E. Csorna; V. Jain; S. Marka; R. Godang; K. Kinoshita; I. C. Lai; P. Pomianowski; S. Schrenk; G. Bonvicini; D. Cinabro; R. Greene; L. P. Perera; G. J. Zhou; B. Barish; M. Chadha; S. Chan; G. Eigen; J. S. Miller; C. O'grady; M. Schmidtler; J. Urheim; A. J. Weinstein; F. Würthwein; D. M. Asner; D. W. Bliss; G. Masek; H. P. Paar; S. Prell; M. Sivertz; V. Sharma

1998-01-01

34

Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at $\\\\sqrt{s}$ = 7 TeV  

Microsoft Academic Search

A measurement of event shape variables is presented for large momentum transfer proton-proton collisions using the ATLAS detector at the Large Hadron Collider. Six event shape variables calculated using hadronic jets are studied in inclusive multi-jet events in 35 pb$^{-1}$ of integrated luminosity at a center-of-mass energy of $\\\\sqrt{s}$ = 7 TeV. These measurements are compared to predictions by three

Georges Aad; Brad Abbott; Jalal Abdallah; Samah Abdel Khalek; Ahmed Ali Abdelalim; Ovsat Abdinov; Babak Abi; Maris Abolins; Ossama AbouZeid; Halina Abramowicz; Henso Abreu; Emilio Acerbi; Bobby Samir Acharya; Leszek Adamczyk; David Adams; Tetteh Addy; Jahred Adelman; Stefanie Adomeit; Paolo Adragna; Tim Adye; Scott Aefsky; Juan Antonio Aguilar-Saavedra; Marco Agustoni; Mohamed Aharrouche; Steven Ahlen; Florian Ahles; Ashfaq Ahmad; Mahsana Ahsan; Giulio Aielli; Taylan Akdogan; Torsten Paul Ake ?kesson; Ginga Akimoto; Andrei Akimov; Mohammad Alam; Muhammad Aftab Alam; Justin Albert; Solveig Albrand; Martin Aleksa; Igor Aleksandrov; Franco Alessandria; Calin Alexa; Gideon Alexander; Gauthier Alexandre; Theodoros Alexopoulos; Muhammad Alhroob; Malik Aliev; Gianluca Alimonti; John Alison; Benedict Allbrooke; Phillip Allport; Sarah Allwood-Spiers; John Almond; Alberto Aloisio; Raz Alon; Alejandro Alonso; Barbara Alvarez Gonzalez; Mariagrazia Alviggi; Katsuya Amako; Christoph Amelung; Vladimir Ammosov; Antonio Amorim; Nir Amram; Christos Anastopoulos; Lucian Stefan Ancu; Nansi Andari; Timothy Andeen; Christoph Falk Anders; Gabriel Anders; Kelby Anderson; Attilio Andreazza; George Victor Andrei; Xabier Anduaga; Philipp Anger; Aaron Angerami; Francis Anghinolfi; Alexey Anisenkov; Nuno Anjos; Alberto Annovi; Ariadni Antonaki; Mario Antonelli; Alexey Antonov; Jaroslav Antos; Fabio Anulli; Sahar Aoun; Ludovica Aperio Bella; Rudi Apolle; Giorgi Arabidze; Ignacio Aracena; Yasuo Arai; Ayana Arce; Samir Arfaoui; Jean-Francois Arguin; Engin Arik; Metin Arik; Aaron James Armbruster; Olivier Arnaez; Vanessa Arnal; Christian Arnault; Andrei Artamonov; Giacomo Artoni; David Arutinov; Shoji Asai; Ruslan Asfandiyarov; Stefan Ask; Barbro ?sman; Lily Asquith; Ketevi Assamagan; Alan Astbury; Bernard Aubert; Etienne Auge; Kamil Augsten; Mathieu Aurousseau; Giuseppe Avolio; Rachel Maria Avramidou; David Axen; Georges Azuelos; Yuya Azuma; Max Baak; Giuseppe Baccaglioni; Cesare Bacci; Andre Bach; Henri Bachacou; Konstantinos Bachas; Moritz Backes; Malte Backhaus; Elisabeta Badescu; Paolo Bagnaia; Seema Bahinipati; Yu Bai; David Bailey; Travis Bain; John Baines; Oliver Keith Baker; Mark Baker; Sarah Baker; Elzbieta Banas; Piyali Banerjee; Swagato Banerjee; Danilo Banfi; Andrea Michelle Bangert; Vikas Bansal; Hardeep Singh Bansil; Liron Barak; Sergei Baranov; Angela Barbaro Galtieri; Tom Barber; Elisabetta Luigia Barberio; Dario Barberis; Marlon Barbero; Dmitri Bardin; Teresa Barillari; Marcello Barisonzi; Timothy Barklow; Nick Barlow; Bruce Barnett; Michael Barnett; Antonio Baroncelli; Gaetano Barone; Alan Barr; Fernando Barreiro; João Barreiro Guimarães da Costa; Pierre Barrillon; Rainer Bartoldus; Adam Edward Barton; Valeria Bartsch; Richard Bates; Lucia Batkova; Richard Batley; Andreas Battaglia; Michele Battistin; Florian Bauer; Harinder Singh Bawa; Steven Beale; Tristan Beau; Pierre-Hugues Beauchemin; Roberto Beccherle; Philip Bechtle; Hans Peter Beck; Anne Kathrin Becker; Sebastian Becker; Matthew Beckingham; Karl-Heinz Becks; Andrew Beddall; Ayda Beddall; Sourpouhi Bedikian; Vadim Bednyakov; Christopher Bee; Michael Begel; Silvia Behar Harpaz; Michael Beimforde; Camille Belanger-Champagne; Paul Bell; William Bell; Gideon Bella; Lorenzo Bellagamba; Francesco Bellina; Massimiliano Bellomo; Alberto Belloni; Olga Beloborodova; Konstantin Belotskiy; Olga Beltramello; Odette Benary; Driss Benchekroun; Katarina Bendtz; Nektarios Benekos; Yan Benhammou; Eleonora Benhar Noccioli; Jorge-Armando Benitez Garcia; Douglas Benjamin; Mathieu Benoit; James Bensinger; Kamal Benslama; Stan Bentvelsen; David Berge; Elin Bergeaas Kuutmann; Nicolas Berger; Frank Berghaus; Elina Berglund; Jürg Beringer; Pauline Bernat; Ralf Bernhard; Catrin Bernius; Tracey Berry; Claudia Bertella; Antonio Bertin; Federico Bertolucci; Maria Ilaria Besana; Geert-Jan Besjes; Nathalie Besson; Siegfried Bethke; Wahid Bhimji; Riccardo-Maria Bianchi; Michele Bianco; Otmar Biebel; Stephen Paul Bieniek; Katharina Bierwagen; Jed Biesiada; Michela Biglietti; Halina Bilokon; Marcello Bindi; Sebastien Binet; Ahmet Bingul; Cesare Bini; Catherine Biscarat; Urban Bitenc; Kevin Black; Robert Blair; Jean-Baptiste Blanchard; Georges Blanchot; Tomas Blazek; Craig Blocker; Jacek Blocki; Alain Blondel; Walter Blum; Ulrike Blumenschein; Gerjan Bobbink; Victor Bobrovnikov; Simona Serena Bocchetta; Andrea Bocci; Christopher Richard Boddy; Michael Boehler; Jennifer Boek; Nele Boelaert; Joannes Andreas Bogaerts; Alexander Bogdanchikov; Andrei Bogouch; Christian Bohm; Jan Bohm; Veronique Boisvert; Tomasz Bold; Venera Boldea

2012-01-01

35

The electric form factor of the neutron at low momentum transfers as measured at Bates Large Acceptance Spectrometer Toroid  

NASA Astrophysics Data System (ADS)

Elastic form factors are characteristic signatures of the electromagnetic properties of hadronic matter. The more precisely we can measure these values, the more powerful becomes the predictability of our theory. The proton's form factors ( GpE,GpM ) have been measured remarkably well compared to the neutron. While the Magnetic form factor of the neutron is reasonably well known, the Electric Form Factor still retains difficulties due to its small magnitude and the relative inefficiency of detecting neutral particles. The lack of a pure neutron source is another obstacle. Although we are in pursuit of the elastic form factors, the two-nucleon system of deuterium has been shown to be a worthy target for extracting data on the structure of nucleons as well as properties of few-body hadronic systems. Data from unpolarized cross section measurements have proven insufficient for extracting GnE , but polarized scattering from a polarized Deuterium target has been shown to be well suited for determination of GnE . The double polarization observables of a vector polarized Deuterium target and polarized electron beam is proportional to the product of the electric and magnetic form factors of the neutron. The Bates Large Acceptance Spectrometer Toroid (BLAST) has been developed specifically to measure the scattering of a polarized electron beam off a vector and tensor polarized deuterium target and thus fulfills our needs for extracting GnE . The Bates accelerator provides a high-duty polarized electron beam stored in the South Hall Ring (SHR) that is passing through an internal target of both vector and tensor polarized monatomic deuterium as well as polarized monatomic hydrogen provided by an Atomic Beam Source (ABS). A large acceptance detector, BLAST, has been installed to measure several scattering reactions including the directly applicable H2? e?,e'n p reaction. This work summarizes the experimental investigations of the extraction of GnE from the BLAST data. Points were extracted at four values of four-momentum transfers (Q2 = 0.14, 0.20, 0.29, 0.41 GeV 2). The world's data and the new BLAST data were fit to determine GnE to +/-5.8% from 0 < Q2 < 1.8 GeV2. The best fit includes model dependent contributions from a low Q2 bump and a smooth dipole term. A second fit is shown using a model independent sum of gaussians in order to provide a more reliable determination of the uncertainty of the world's measurement of GnE from double polarized scattering.

Geis, Eugene J.

36

Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at sqrt{{s}}=7 TeV  

NASA Astrophysics Data System (ADS)

A measurement of event shape variables is presented for large momentum transfer proton-proton collisions using the ATLAS detector at the Large Hadron Collider. Six event shape variables calculated using hadronic jets are studied in inclusive multi-jet events in 35 pb-1 of integrated luminosity at a center-of-mass energy of sqrt{s} = 7 TeV. These measurements are compared to predictions by three Monte Carlo event generators containing leading-logarithmic parton showers matched to leading order matrix elements for 2?2 and 2? n ( n=2,…,6) scattering. Measurements of the third-jet resolution parameter, aplanarity, thrust, sphericity, and transverse sphericity are generally well described. The mean value of each event shape variable is evaluated as a function of the average momentum of the two leading jets p T,1 and p T,2, with a mean p T approaching 1 TeV.

Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodet, E.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Buanes, T.; Buat, Q.; Bucci, F.; Buchanan, J.; Buchholz, P.; Buckingham, R. M.; Buckley, A. G.; Buda, S. I.; Budagov, I. A.; Budick, B.

2012-11-01

37

The large momentum transfer reaction 12C( p,2 p + n) as a new method for measuring short range NN correlations in nuclei  

Microsoft Academic Search

The reaction 12C(p,2p + n) was measured for momentum transfers of 4.8 and 6.2 (GeV\\/c)2 at beam momenta of 5.9 and 7.5 GeV\\/c. We measured the quasi-elastic reaction (p,2p) at ?cm ? 90°, in a kinematically complete measurement. The neutron momentum was measured in triple coincidence with the two emerging high momentum protons. We present the correlation between the momenta

J. Aclander; J. Alster; D. Barton; G. Bunce; A. Carroll; N. Christensen; H. Courant; S. Durrant; S. Gushue; S. Heppelmann; E. Kosonovsky; I. Mardor; Y. Mardor; M. Marshak; Y. Makdisi; E. D. Minor; I. Navon; H. Nicholson; E. Piasetzky; T. Roser; J. Russell; M. Sargsian; C. S. Sutton; M. Tanaka; C. White; J. Y. Wu

1999-01-01

38

Nonlocal momentum transfer in welcher Weg measurements  

NASA Astrophysics Data System (ADS)

A ``which-path'' (welcher Weg) measurement necessarily destroys the fringes in a double-slit interference experiment. We show that in all instances one may attribute this destruction to a disturbance of the particle's momentum by an amount equal to at least ??/2d, where d is the slit separation, in accordance with the uncertainty principle. However, this momentum transfer need not be local; that is, it need not act at either of the slits through which the particle passes. For well-known welcher Weg measurements such as Einstein's recoiling slit and Feynman's light microscope, the disturbance can be understood in terms of random classical momentum kicks that act locally. In some recent proposals, including that by Scully, Englert, and Walther [Nature (London) 351, 111 (1991)], the momentum transfer is of a peculiarly quantum, nonlocal nature. In this paper we introduce a formalism based on the Wigner function, as this describes both the local and nonlocal momentum transfer caused by any welcher Weg measurement. We show that for some examples, such as that of Scully, Englert, and Walther, there is no momentum disturbance at the slits even though the nonlocal momentum disturbance is sufficient to destroy the interference pattern. Finally, we discuss the experimental signatures of nonlocal versus local momentum transfer and demonstrate a strong similarity to the nonlocality of the Aharonov-Bohm effect.

Wiseman, H. M.; Harrison, F. E.; Collett, M. J.; Tan, S. M.; Walls, D. F.; Killip, R. B.

1997-07-01

39

Momentum transfer in boundary layers  

Microsoft Academic Search

The continuity and momentum equations of fluid flow are considered along with thin-shear-layer equations, the analysis of laminar shear layers, the analysis of turbulent shear layers, numerical methods for thin shear layers, numerical solutions of laminar and turbulent boundary layers, aspects of stability and transition, and complex shear layers and viscous\\/inviscid interactions. Three-dimensional and unsteady flows are discussed, taking into

T. Cebeci; P. Bradshaw

1977-01-01

40

Nonlocal momentum transfer in welcher Weg measurements  

Microsoft Academic Search

A ''which-path'' ~welcher Weg! measurement necessarily destroys the fringes in a double-slit interference experiment. We show that in all instances one may attribute this destruction to a disturbance of the particle's momentum by an amount equal to at least p\\\\\\/2d, where d is the slit separation, in accordance with the uncertainty principle. However, this momentum transfer need not be local;

H. M. Wiseman; F. E. Harrison; M. J. Collett; S. M. Tan; D. F. Walls; R. B. Killip

1997-01-01

41

Adaptive Momentum Management for Large Space Structures.  

National Technical Information Service (NTIS)

Momentum management is discussed for a Large Space Structure (LSS) with the structure selected configuration being the Initial Orbital Configuration (IOC) of the dual keel space station. The external forces considered were gravity gradient and aerodynamic...

E. Hahn

1987-01-01

42

Electroweak nuclear response at moderate momentum transfer  

SciTech Connect

We discuss the convergence of the expansion of the nuclear electroweak current in powers of |k|/M, where M is the nucleon mass and k denotes either the momentum transfer or the momentum of the struck nucleon. We have computed the electron and neutrino scattering cross sections off uniform nuclear matter at equilibrium density using correlated wave functions and the cluster expansion formalism. The results of our work suggest that the proposed approach provides accurate estimates of the measured electron scattering cross sections. On the other hand, the description of the current based on the widely used leading-order approximation does not appear to be adequate, even at momentum transfer as low as 300 MeV.

Ankowski, Artur M.; Benhar, Omar [INFN and Department of Physics, 'Sapienza' Universita di Roma, I-00185 Roma (Italy)

2011-05-15

43

Electroproduction at large momentum transfers  

SciTech Connect

The possibilities of electroproduction experiments at a facility such as the proposed European electron accelerator are discussed. Examples given are from studies of hadronization, color transparency, backward production, virtual Compton scattering and target spectator decay. Some conclusions about machine parameters are drawn. 25 refs., 15 figs.

van Bibber, K.

1991-03-01

44

Anomalous Quasielastic Electron Scattering from Single H2, D2, and HD Molecules at Large Momentum Transfer: Indications of Nuclear Spin Effects  

NASA Astrophysics Data System (ADS)

Quasielectron electron scattering from gaseous H2, D2, a 50?50 mixture of H2 and D2, and HD is investigated with 2.25 keV impact energy and a momentum transfer ?q of 19.7 a.u. The energy transfer is less than the dissociation energy. The spectral positions of the H and D recoil peaks agree with Rutherford scattering theory. Surprisingly, in the spectrum of the 50?50 H2-D2 mixture, the integrated intensity of the H peak is 31%±4% lower (as compared to that of D) than predicted by Rutherford scattering, despite equal screening of nuclear charges by the electrons. In contrast, the ratio of scattering intensities from H and D in HD agrees with the predictions of Rutherford scattering. Comparison is made with neutron Compton scattering results from the same systems, but at higher energy transfers causing bond breaking. Possible theoretical explanations are outlined.

Cooper, G.; Hitchcock, A. P.; Chatzidimitriou-Dreismann, C. A.

2008-02-01

45

Diffractive photon production at high momentum transfer in ep collisions  

NASA Astrophysics Data System (ADS)

The diffractive photon production at large momentum transfer and large energies is a probe of the parton dynamics of the diffractive exchange. In this paper we revisit the leading order Balitsky-Fadin-Kuraev-Lipatov equation approach for this process and estimate, for the first time, the differential and total cross sections considering the next-to-leading order corrections for the Balitsky-Fadin-Kuraev-Lipatov characteristic function. We obtain a reasonable agreement with the DESY-HERA data.

Gonçalves, V. P.; Sauter, W. K.

2013-03-01

46

Exclusive Reactions at High Momentum Transfer  

NASA Astrophysics Data System (ADS)

Hard exclusive scattering at JLab / P. Kroll -- AdS/CFT and exclusive processes in QCD / S. J. Brodsky and G. F. de Téramond -- Hadron structure matters in collisions at high energy and momentum / A. W. Thomas -- Inclusive perspectives / P. Hoyer -- Fitting DVCS at NLO and beyond / K. Kumericki, D. Müller and K. Passek-Kumericki -- Spin-orbit correlations and single-spin asymmetries / M. Burkardt -- Electroproduction of soft pions at large momentum transfers / V. M. Braun, D. Yu. Ivanov and A. Peters -- Color transparency: 33 years and still running / M. Strikman -- Meson clouds and nucleon electromagnetic form factors / G. A. Miller -- Covariance, dynamics and symmetries, and hadron form factors / M. S. Bhagwat, I. C. Cloët and C. D. Roberts -- N to [symbol] electromagnetic and axial form factors in full QCD / C. Alexandrou -- Real and virtual compton scattering in perturbative QCD / C.-R. Ji and R. Thomson -- Deeply virtual compton scattering at Jefferson Lab / F. Sabatie -- DVCS at HERMES: recent results / F. Ellinghaus -- Deeply virtual compton scattering with CLAS / F. X. Girod -- Deeply virtual compton scattering off the neutron at JLab Hall A / M. Mazouz -- The future DVCS experiments in Hall A at JLab / J. Roche -- Deeply virtual compton scattering with CLAS12 / L. Elouadrhiri -- Quark helicity flip and the transverse spin dependence of inclusive DIS / A. Afanasev, M. Strikman and C. Weiss -- Deeply virtual pseudoscalar meson production / V. Kubarovsky and P. Stoler -- Exclusive p[symbol] electroproduction on the proton: GPDs or not GPDs? / M. Guidal and S. Morrow -- p[symbol] transverse target spin asymmetry at HERMES / A. Airapetian -- Electroproduction of ø(1020) mesons / J. P. Santoro and E. S. Smith -- Generalized parton distributions from hadronic observables / S. Ahmad ... [et al.] -- Imaging the proton via hard exclusive production in diffractive pp scattering / G. E. Hyde ... [et al.] -- Regge contributions to exclusive electro-production / A. P. Szczepaniak and J. T. Londergan -- High energy break-up of few-nucleon systems / M. Sargsian -- Photodisintegration of the deuteron, and [symbol]He / R. Gilman -- A review of the few-body form factors / G. G. Petratos -- Nucleon form factor measurements and interpretation / C. F. Perdrisat -- Implications of G[symbol](Q[symbol])/G[symbol](Q[symbol]) / S. Dubnicka and A. Z. Dubnickova -- High Q[symbol] large acceptance G[symbol]/G[symbol] measurements using polarization transfer / L. Pentchev, C. F. Perdrisat and B. Wojtsekhowski -- A precise measurement of the neutron magnetic form factor G[symbol] in the few-GeV[symbol] region / G. P. Gilfoyle et al. (the CLAS collaboration) -- Magnetic form factor of the neutron up to 8 (GeV/c)[symbol] / B. Quinn -- Timelike form factors / K. K. Seth -- Polarization phenomena in e[symbol]e[symbol] [symbol] pp¯ revisited / A. Z. Dubnickova and S. Dubnicka -- Light-cone sum rules for form factors of the N[symbol] transition at Q[symbol] = 0 / J. Rohrwild -- Exclusive electroproduction of [symbol] mesons / A. N. Villano (for the JLab E01-002 collaboration) -- Exclusive electroproduction of [symbol] mesons in the S[symbol](1535) resonance region at high momentum transfer / M. M. Dalton (for the JLab E01-002 collaboration) -- Two-photon exchange in electron-proton elastic scattering: theory update / A. V. Afanasev -- Two-photon exchange contributions to elastic ep scattering in the non-local field formalism / P. Jain, S. D. Joglekar and S. Mitra -- Beyond the born approximation: a precise comparison of positron-proton and electron-proton elastic scattering in CLAS / J. Lachniet et al. -- Meson form factors in the space-like region / D. Gaskell -- Pion-nucleon distribution amplitudes / A. Peters -- [symbol] scattering in the 1/N[symbol] expansion / H. J. Kwee -- [symbol] annihilations into quasi-two-body final states at 10.58 GeV / Kai Yi -- Transition distribution amplitudes / J. P. Lansberg, B. Pire and L. Szymanowski -- Novel QCD effects from initial and final state interactions / S. J. Brodsky -- Parton distributions and sp

Radyushkin, Anatoly; Stoler, Paul

2008-03-01

47

Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer  

SciTech Connect

The Jefferson Lab Hall A experiment E99-114 comprised a series of measurements to explore proton Compton scattering at high momentum transfer. For the first time, the polarisation transfer observables in the p (~ 0 ~ p) reaction were measured in the GeV energy range, where it is believed that quark-gluon degrees of freedom begin to dominate. The experiment utilised a circularly polarised photon beam incident on a liquid hydrogen target, with the scattered photon and recoil proton detected in a lead-glass calorimeter and a magnetic spectrometer, respectively.

David Hamilton

2004-12-31

48

Limitation of linear momentum transfer in heavy-ion reactions  

SciTech Connect

Angular correlations of fragments from 292-MeV-/sup 20/Ne-induced fission of /sup 165/Ho, /sup 181/Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U have been measured. The correlations are interpreted in terms of a full linear momentum transfer component and several components with less than full momentum transfer. The maximum angular momentum, l/sub FLMT/, associated with the full linear momentum transfer component from these and other previous angular correlation measurements, as well as from velocity measurements of evaporation residues, corresponds to rolling heavy-ion collisions.

Huizenga, J.R.; Birkelund, J.R.; Tubbs, L.E.; Hilscher, D.; Jahnke, U.; Rossner, H.; Gebauer, B.; Lettau, H.

1983-10-01

49

Electroproduction of hyperons at low momentum transfer  

NASA Astrophysics Data System (ADS)

A high resolution study of the H(e,e'K+)?,Sigma 0 reaction was performed at Hall A, TJNAF as part of the hypernuclear experiment E94-107. One important ingredient to the measurement of the hypernuclear cross section is the elementary cross section for production of hyperons, ? and Sigma0. This reaction was studied using a hydrogen (i.e. a proton) target. Data were taken at very low Q2 (˜0.07 (GeV/c) 2) and W˜2.2 GeV. Kaons were detected along the direction of q, the momentum transferred by the incident electron (thetaCM˜6°). In addition, there are few data available regarding electroproduction of hyperons at low Q2 and thetaCM and the available theoretical models differ significantly in this kinematical region of W. The measurement of the elementary cross section was performed by scaling the Monte Carlo cross section (MCEEP) with the experimental-to-simulated yield ratio. The Monte Carlo cross section includes an experimental fit and extrapolation from the existing data for electroproduction of hyperons. Moreover, the estimated transverse component of the electroproduction cross section of H(e,e'K+)? was compared to the different predictions of the theoretical models and exisiting data curves for photoproductions of hyperons. None of the models fully describe the cross-section results over the entire angular range. Furthermore, measurements of the Sigma 0/? production ratio were performed at theta CM˜6°, where data are not available. Finally, data for the measurements of the differential cross sections and the Sigma 0/? production were binned in Q2, W and thetaCM to understand the dependence on these variables. These results are not only a fundamental contribution to the hypernuclear spectroscopy studies but also an important experimental measurement to constrain existing theoretical models for the elementary reaction.

Acha, Armando R.

50

Chapter 8. Efficiency of Angular Momentum Transfer by Shear Instability  

Microsoft Academic Search

In order to calculate the rate of angular momentum transfer by the shear instability, we use perturbation theory. We obtain the lowest order of the flux of the angular momentum, solving the linear order as well as the second order perturbation equations. The differentially rotating cylinder with isentropic and polytropic equation of state is investigated for the sake of simplicity.

S. M. Miyama; Minoru Sekiya

1988-01-01

51

A Momentum Transfer Demonstration with "Happy/Unhappy" Balls.  

ERIC Educational Resources Information Center

Describes a simple setup and procedure that uses "happy/unhappy" balls (two balls with different degrees of elasticity) to lead students into a discussion of momentum transfer involving elastic and inelastic collisions. (ZWH)

Bucheit, Fred

1994-01-01

52

Experimental Determination of Collision Cross Sections for Momentum Transfer.  

National Technical Information Service (NTIS)

Effective collision cross sections for momentum transfer between electrons and neutral particles in argon, nitrogen, oxygen, helium, carbon monoxide and dioxide, nitrogen dioxide, water vapor, and mercury plasmas were measured directly by two independent ...

S. T. Demetriades G. Fonda-Bonardi G. S. Argyropoulos

1969-01-01

53

Momentum transfer between the Io plasma wake and Jupiter's ionosphere  

NASA Astrophysics Data System (ADS)

The interaction between Io and Jupiter is dramatically illustrated by recent ultraviolet and infrared imaging of Jupiter's ionosphere. Bright auroral emissions are observed at the base of Io's flux tube with emissions at the footprint of Io's wake extending large distances downstream (roughly 100° around Jupiter). We propose as a possible explanation for the persisting wake emissions a subcorotating torus flux tube downstream from Io that results in high-latitude parallel electric fields. The transfer of momentum to the subcorotating Iogenic plasma from first the corotating torus and eventually the Jovian ionosphere via the Alfvénic interaction result in intense field-aligned currents which can lead to the formation of parallel electric fields. By comparing the field-aligned current density of the initial Alfvénic disturbance generated by the stagnated flow in Io's wake to the required current density for steady state acceleration of the flux tube we infer a current limitation, or momentum decoupling, caused by a high-latitude field-aligned potential drop. As a result, the subcorotating flux tube is partially decoupled from the Jovian ionosphere and auroral emissions persist for large distances downstream of the initial Io-disturbed flux tube. Model results suggest that the extended wake emissions are initially driven by a ˜70 kV cross-wake potential, which is consistent with observed auroral emissions caused by electron precipitation with energy on the order of tens of keV.

Delamere, P. A.; Bagenal, F.; Ergun, R.; Su, Y.-J.

2003-06-01

54

Momentum transfer in a turbulent, particle-laden Couette flow  

NASA Astrophysics Data System (ADS)

A point-force model is used to study turbulent momentum transfer in the presence of moderate mass loadings of small (relative to Kolmogorov scales), dense (relative to the carrier phase density) particles. Turbulent Couette flow is simulated via direct numerical simulation, while individual particles are tracked as Lagrangian elements interacting with the carrier phase through a momentum coupling force. This force is computed based on the bulk drag of each particle, computed from its local slip velocity. By inspecting a parameter space consisting of particle Stokes number and mass loading, a general picture of how and under what conditions particles can alter near-wall turbulent flow is developed. In general, it is found that particles which adhere to the requirements for the point-particle approximation attenuate small-scale turbulence levels, as measured by wall-normal and spanwise velocity fluctuations, and decrease turbulent fluxes. Particles tend to weaken near-wall vortical activity, which in turn, through changes in burst/sweep intensities, weakens the ability of the turbulent carrier-phase motion to transfer momentum in the wall-normal direction. Compensating this effect is the often-ignored capacity of the dispersed phase to carry stress, resulting in a total momentum transfer which remains nearly unchanged. The results of this study can be used to interpret physical processes above the ocean surface, where sea spray potentially plays an important role in vertical momentum transfer.

Richter, David H.; Sullivan, Peter P.

2013-05-01

55

Momentum transfer to rotating magnetized plasma from gun plasma injection  

SciTech Connect

Numerical simulations are carried out to investigate the penetration and momentum coupling of a gun-injected plasma slug into a rotating magnetized plasma. An experiment along these lines is envisioned for the Maryland Centrifugal Experiment (MCX) [R. F. Ellis et al., Phys. Plasmas 8, 2057 (2001)] using a coaxial plasma accelerator gun developed by HyperV Technologies Corp. [F. D. Witherspoon et al., Bull. Am. Phys. Soc. 50, LP1 87 (2005)]. The plasma gun would be located in the axial midplane and fired off-axis into the rotating MCX plasma annulus. The numerical simulation is set up so that the initial momentum in the injected plasma slug is of the order of the initial momentum of the target plasma. Several numerical firings are done into the cylindrical rotating plasma. Axial symmetry is assumed. The slug is seen to penetrate readily and deform into a mushroom, characteristic of interchange deformations. It is found that up to 25% of the momentum in the slug can be transferred to the background plasma in one pass across a cylindrical chord. For the same initial momentum, a high-speed low density slug gives more momentum transfer than a low-speed high density slug. Details of the numerical simulations and a scaling study are presented.

Shamim, Imran; Hassam, A. B.; Ellis, R. F.; Witherspoon, F. D.; Phillips, M. W. [Institute for Research in Electronics and Applied Physics (IREAP), University of Maryland, College Park, Maryland 20742 (United States); HyperV Technologies Corporation, Chantilly, Virginia 20151 (United States)

2006-11-15

56

The maximum momentum transfer in proton-hydrogen collisions.  

PubMed

The upper limit of momentum transfer by a proton to K-shell electrons is calculated in a restricted three-body classical model. The model shows that the infinite upper limit used in practice, is generally good except for low energy protons passing through an extremely rarefied gas. PMID:11538831

Xu, Y J; Khandelwal, G S; Wilson, J W

1986-03-24

57

Momentum and Angular Momentum Transfer in Oblique Impacts: Implications for Asteroid Rotations  

NASA Astrophysics Data System (ADS)

We conducted a series of high velocity oblique impact experiments (0.66-6.7 km/s) using polycarbonate (plastic) projectiles and targets made of mortar, aluminum alloy, and mild steel. We then calculated the efficiencies of momentum transfer for small cratering impacts. They are eta = (M'V_n')/(mv_n) and zeta = (M'V_t')/(mv_t), where m and v are the mass and velocity of a projectile, and M' and V' represent those of a postimpact target. Subscripts ``n'' and ``t'' denote the components normal and tangential to the target surface at the impact point, respectively. The main findings are: (1) eta increases with increasing impact velocity; (2) eta is larger for mortar than for ductile metallic targets; (3) zeta for mortar targets seems to increase with the impact velocity in the velocity range less than about 2 km/s and decrease with it in the higher velocity range; (4) zeta for the aluminum alloy targets correlates negatively with incident zenith angle of the projectile. In addition to these findings on the momentum transfer, we show theoretically that ``zeta_L'' can be expressed by eta and zeta for small cratering impact. Here, zeta_L is the spin angular momentum that the target acquires at impact divided by the collisional angular momentum due to the projectile. This is an important parameter to study the collisional evolution of asteroid rotation. For a spherical target, zeta_L is shown to be well approximated by zeta.

Yanagisawa, Masahisa; Hasegawa, Sunao; Shirogane, Nobutoshi

1996-09-01

58

Investigation of the Proton Structure Function in the Region of High Momentum Transfers.  

National Technical Information Service (NTIS)

The proton structure function in the region of high-momentum transfer in a wide range of x with total error of approx. 10%, measured by the European muon collaboration is used to find the theoretical model which best of all describes the range of large Q/...

L. A. Grigoryan

1987-01-01

59

Electroproduction of the {Delta}(1232) Resonance at High Momentum Transfer  

SciTech Connect

We studied the electroproduction of the {Delta}(1232) resonance via the reaction p(e,thinspe{sup {prime}}p){pi}{sup 0} at four-momentum transfers Q{sup 2}=2.8 and 4.0 GeV{sup 2} . This is the highest Q{sup 2} for which exclusive resonance electroproduction has ever been observed. Decay angular distributions for {Delta}{r_arrow}p{pi}{sup 0} were measured over a wide range of barycentric energies covering the resonance. The N{endash}{Delta} transition form factor G{sup {asterisk}}{sub M} and ratios of resonant multipoles E{sub 1+}/M{sub 1+} and S{sub 1+}/M{sub 1+} were extracted from the decay angular distributions. These ratios remain small, indicating that perturbative QCD is not applicable for this reaction at these momentum transfers. {copyright} {ital 1998} {ital The American Physical Society }

Frolov, V.V.; Adams, G.S.; Davidson, R.M.; Klusman, M.; Mukhopadhyay, N.C.; Napolitano, J.; Nozar, M.; Price, J.W.; Stoler, P.; Witkowski, M. [Physics Department, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Bosted, P. [Physics Department, American University, Washington, D.C. 20016 (United States); Armstrong, C.S.; Meekins, D. [Department of Physics, College of William Mary, Williamsburg, Virginia 23187 (United States); Assamagan, K.; Avery, S.; Baker, O.K.; Eden, T.; Gaskell, D.; Gueye, P.; Hinton, W.; Keppel, C.; Madey, R.; Niculescu, G.; Niculescu, I.; Tang, L. [Physics Department, Hampton University, Hampton, Virginia 23668 (United States); Ahmidouch, A.; Madey, R. [Physics Department, Kent State University, Kent, Ohio 44242 (United States); Kim, W. [Physics Department, Kyungpook National University, Taegu, South (Korea); Baker, O.K.; Burkert, V.; Carlini, R.; Dunne, J.; Ent, R.; Keppel, C.; Mack, D.; Mitchell, J.; Tang, L.; Wood, S. [Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States); Koltenuk, D. [Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Minehart, R. [Physics Department, University of Virginia, Charlottesville, Virginia 22903 (United States); Mkrtchyan, H.; Tadevosian, V. [Yerevan Physics Institute, Yerevan (Armenia)

1999-01-01

60

Interstellar propulsion using a pellet stream for momentum transfer  

SciTech Connect

A pellet-stream concept for interstellar propulsion is described. Small pellets are accelerated in the solar system and accurately guided to an interstellar probe where they are intercepted and transfer momentum. This propulsion system appears to offer orders-of-magnitude improvements in terms of engineering simplicity and power requirements over any other known feasible system for transport over interstellar distance in a time comparable to a human lifespan.

Singer, C.E.

1979-10-01

61

Momentum and Heat Transfer over Urban-like Surfaces  

Microsoft Academic Search

Momentum and heat transfer was examined for the urban-like surfaces used within the Comprehensive Outdoor Scale MOdel (COSMO)\\u000a experiments. Simultaneous and comparative meteorological measurements were made over a pair of scale models with different\\u000a block geometries. These data were analyzed to investigate the influence of height variations, obstacle elongation, and packing\\u000a density, ?\\u000a p\\u000a , of blocks on the aerodynamic

Manabu Kanda; Takanobu Moriizumi

2009-01-01

62

Alignment of transferred angular momentum in deeply inelastic collisions from discrete gamma-ray angular correlations  

Microsoft Academic Search

The in-plane to out-of-plane ratio of discrete gamma-rays of known multipolarity has been measured in coincidence with projectile-like reaction products for the 86Kr +166Er reaction at 600 MeV. The 6+ --> 4+ and 4+ --> 2+ transitions in several residual nuclei exhibit a large ratio of in-plane to out-of-plane yield, confirming the large alignment of the transferred angular momentum in

R. J. Puigh; H. Doubre; A. Lazzarini; A. Seamster; R. Vandenbosch; M. S. Zisman; T. D. Thomas

1980-01-01

63

Polarization Transfer in Proton Compton Scattering at High Momentum Transfer  

Microsoft Academic Search

Compton scattering from the proton was investigated at s=6.9 GeV2 and t=-4.0 GeV2 via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in disagreement with a prediction of perturbative QCD based on a two-gluon exchange mechanism, but agree well with a prediction based on a reaction

D. J. Hamilton; V. H. Mamyan; K. A. Aniol; J. R. Annand; P. Y. Bertin; L. Bimbot; P. Bosted; J. R. Calarco; A. Camsonne; G. C. Chang; T.-H. Chang; Seonho Choi; E. Chudakov; A. Danagoulian; P. Degtyarenko; C. W. de Jager; A. Deur; D. Dutta; K. Egiyan; H. Gao; F. Garibaldi; O. Gayou; R. Gilman; A. Glamazdin; C. Glashausser; J. Gomez; J.-O. Hansen; D. Higinbotham; W. Hinton; T. Horn; C. Howell; T. Hunyady; C. E. Hyde-Wright; X. Jiang; M. K. Jones; M. Khandaker; A. Ketikyan; V. Kubarovsky; K. Kramer; G. Kumbartzki; G. Laveissière; J. Lerose; R. A. Lindgren; D. J. Margaziotis; P. Markowitz; K. McCormick; Z.-E. Meziani; R. Michaels; P. Moussiegt; S. Nanda; A. M. Nathan; D. M. Nikolenko; V. Nelyubin; B. E. Norum; K. Paschke; L. Pentchev; C. F. Perdrisat; E. Piasetzky; R. Pomatsalyuk; V. A. Punjabi; I. Rachek; A. Radyushkin; B. Reitz; R. Roche; M. Roedelbronn; G. Ron; F. Sabatie; A. Saha; N. Savvinov; A. Shahinyan; Y. Shestakov; S. Sirca; K. Slifer; P. Solvignon; P. Stoler; S. Tajima; V. Sulkosky; L. Todor; B. Vlahovic; L. B. Weinstein; K. Wang; B. Wojtsekhowski; H. Voskanyan; H. Xiang; X. Zheng; L. Zhu

2005-01-01

64

Atom Interferometry with up to 24-Photon-Momentum-Transfer Beam Splitters  

SciTech Connect

We present up to 24-photon Bragg diffraction as a beam splitter in light-pulse atom interferometers to achieve the largest splitting in momentum space so far. Relative to the 2-photon processes used in the most sensitive present interferometers, these large momentum transfer beam splitters increase the phase shift 12-fold for Mach-Zehnder (MZ) and 144-fold for Ramsey-Borde (RB) geometries. We achieve a high visibility of the interference fringes (up to 52% for MZ or 36% for RB) and long pulse separation times that are possible only in atomic fountain setups. As the atom's internal state is not changed, important systematic effects can cancel.

Mueller, Holger; Chiow, Sheng-wey; Long, Quan; Herrmann, Sven [Physics Department, Stanford University, 382 Via Pueblo Mall, Stanford, California 94305 (United States); Chu, Steven [Physics Department, Stanford University, 382 Via Pueblo Mall, Stanford, California 94305 (United States); Lawrence Berkeley National Laboratory and Department of Physics, University of California, Berkeley, 1 Cyclotron Road, Berkeley, California 94720 (United States)

2008-05-09

65

Weak response of neutron matter at low momentum transfer  

NASA Astrophysics Data System (ADS)

The Landau parameters obtained from the matrix elements of an effective interaction recently derived within the formalism of correlated basis functions are used to carry out a study of the weak response of neutron matter in the region of low momentum transfer. The proposed approach allows for a consistent description of different interaction effects and can be extended to describe matter at nonvanishing temperature. The results show that interactions lead to a sizable enhancement of the neutrino mean free path in cold neutron matter. The dependence of the mean free path on temperature and neutrino energy is also analyzed.

Benhar, Omar; Cipollone, Andrea; Loreti, Andrea

2013-01-01

66

Understanding quark flow in high momentum transfer exclusive reactions  

SciTech Connect

A 5.9 GeV/c secondary beam of pions, kaons, and protons directed into a liquid hydrogen target has been used to study high momentum transfer exclusive reactions of the form A + B {yields} C + D. The high sensitivity of this experiment has allowed the differential cross section for 19 two body exclusive reactions to be measured around 90 degrees in the center of mass frame. These high statistic measurements confirm the conclusion of an earlier 10 GeV/c experiment which found that the relative magnitudes of the cross sections are consistent with the dominance of the quark interchange diagram. 6 refs., 4 fig., 1 tab.

White, C.; Courant, H.; Fang, G.; Heller, K.; Johns, K.; Marshak, M.; Shupe, M. (Minnesota Univ., Minneapolis, MN (USA)); Appel, R.; Barton, D.; Bunce, G.; Carroll, A.; Gushue, S.; Kmit, M.; Lowenstein, D.; Makdisi, Y. (Brookhaven National Lab., Upton, NY (USA)); Ma, X.; Russell, J. (Southeastern Massachusetts Univ., North Dartmouth, MA (USA)); Heppelmann, S. (Pennsylvania State Univ., University Park, PA (USA

1990-01-01

67

Mechanisms of momentum and energy transfer in intermediate-energy collisions  

NASA Astrophysics Data System (ADS)

Systematic features of momentum and energy transfer in nuclear reactions above E/A >= 20 MeV are examined. Various mechanisms for momentum transfer are illustrated from exclusive measurements of the 6Li + 238U system at E/A = 25 MeV. These, and other, studies confirm that precompound nucleon emission is the dominant source of momentum and energy loss in central collisions near the Fermi energy. This indicates the growing Importance of nucleon-nucleon collisions relative to mean field effects in intermediate-energy collisions. This result is supported by the approximate agreement between linear momentum transfer data and calculations based on precompound-decay, intranuclear-cascade and BUU/LV models. Another source of momentum loss which becomes increasingly important for E/A >= 40 MeV is intermediate-mass fragment production. Recent measurements of these fragments, tagged according to momentum loss, demonstrate the presence of both equilibrium and non-equilibrium sources. The author is indebted to a large number of his colleagues who participated in this work. Special recognition is due to Kris Kwiatkowski and Mirek Fatyaga at Indiana University who were largely responsible for much of the work presented here. Among the many other collaborators I also wish to express my appreciation to L.W. Woo, W.G. Wilson, R. Byrd, C.K. Gelbke, W.G. Lynch, M.B. Tsang, D.J. Fields, C. Chitwood, J. Pochodzalla, H. Karwowski, L. Nowicki, W. Skulski and J. Jastrzebski. I am also grateful to G. Bertsch, J. Aichelin and M. Blann for use of their theoretical calculations.

Viola, V. E.

1987-09-01

68

Three-dimensional simulations of air flow and momentum transfer in partially harvested forests  

Microsoft Academic Search

In order to predict wind loading on trees (canopy height h) in partially harvested forests, it is necessary to characterize air flow and momentum transfer in progressively more complex\\u000a patterns where groups of trees (or aggregates) are retained. In this study, we used large-eddy simulation to explore the effects\\u000a of aggregate size, inter-aggregate spacing, and the ratio between the aggregate

Terry L. Clark; Stephen J. Mitchell

2007-01-01

69

Emission of Low Momentum Particles at Large Angles from Jet  

NASA Astrophysics Data System (ADS)

We study dynamics of a QGP fluid induced by energetic partons propagating through it. We construct a (3+1)-dimensional QGP-fluid+Jet model. When a jet traverses a uniform fluid, it induces a Mach cone structure of energy density distribution and a vortex ring surrounding a path of the jet. When a pair of jets travels through a radially expanding fluid, low momentum particles are dominantly induced at large angles from the quenched jet. This result is qualitatively consistent with observation of the CMS Collaboration at LHC.

Tachibana, Y.; Hirano, T.

2013-05-01

70

Higgs boson production at large transverse momentum in hadronic collisions  

NASA Astrophysics Data System (ADS)

Production of Higgs bosons accompanied by a large transverse momentum jet at hadron colliders via a top quark loop is calculated to lowest order QCD. Analytic expressions for the matrix elements, including the decay H --> VV --> four massless fermions (V = W,Z), are presented. The dependence of the matrix elements on the mass of the top quark exchanged in the loop in all regions of phase space is studied in detail. The Hj signal is compared with the background arising from VVj and V+3 jet production for LHC and SSC energies.

Baur, U.; Glover, E. W. N.

1990-07-01

71

ANGULAR MOMENTUM TRANSFER IN VELA-LIKE PULSAR GLITCHES  

SciTech Connect

The angular momentum transfer associated with Vela-like glitches has never been calculated directly within a realistic scenario for the storage and release of superfluid vorticity; therefore, the explanation of giant glitches in terms of vortices has not yet been tested against observations. We present the first physically reasonable model, both at the microscopic and macroscopic level (spherical geometry, n = 1 polytropic density profile, density-dependent pinning forces compatible with vortex rigidity), to determine where in the star the vorticity is pinned, how much of it is pinned, and for how long. For standard neutron star parameters (M = 1.4 M{sub Sun }, R{sub s} = 10 km, {Omega}-dot = {Omega}-dot{sub Vela} = -10{sup -10} Hz s{sup -1}), we find that maximum pinning forces of order f{sub m} Almost-Equal-To 10{sup 15} dyn cm{sup -1} can accumulate {Delta}L{sub gl} Almost-Equal-To 10{sup 40} erg s of superfluid angular momentum, and release it to the crust at intervals {Delta}t{sub gl} Almost-Equal-To 3 years. This estimate of {Delta}L{sub gl} is one order of magnitude smaller than that implied indirectly by current models for post-glitch recovery, where the core and inner-crust vortices are taken as physically disconnected; yet, it successfully yields the magnitudes observed in recent Vela glitches for both jump parameters, {Delta}{Omega}{sub gl} and {Delta}{Omega}-dot{sub gl}, provided one assumes that only a small fraction (<10%) of the total star vorticity is coupled to the crust on the short timescale of a glitch. This is reasonable in our approach, where no layer of normal matter exists between the core and the inner-crust, as indicated by existing microscopic calculation. The new scenario presented here is nonetheless compatible with current post-glitch models.

Pizzochero, Pierre M., E-mail: pierre.pizzochero@mi.infn.it [Dipartimento di Fisica, Universita degli Studi di Milano, and Istituto Nazionale di Fisica Nucleare, sezione di Milano, Via Celoria 16, 20133 Milano (Italy)

2011-12-10

72

Momentum and heat transfer in a complex recirculating flow  

SciTech Connect

Three-dimensional and turbulent recirculating flows in enclosed spaces occur in many engineering situations. Accurate measurements of momentum- and heat-transfer characteristics are needed for direct engineering-design applications and for developments of numerical-simulation codes of these flows. A facility to generate recirculating flows driven by buoyancy and/or shear forces in a rectangular cavity was constructed to model such flows. Also, a visualization technique, involving temperature-sensitive liquid-crystal microcapsules, was developed to visualize the temperature and velocity fields simultaneously in any flow plane. Two flow cases were studied: (1) natural convection driven by buoyancy in a bottom-heated cavity, with Gr = 2.4 10/sup 7/, and (2) mixed-convection driven by shear force from a moving lid and buoyancy, with Gr = 2.4 x 10/sup 7/ and Re = 3200. In the mixed-convection case, Gr/Re/sup 2/ = 2.3, indicating that buoyancy and shear forces acting on the flow are comparable. In addition to the flow/temperature visualizations, measurements were made of velocity, temperature, and surface heat flux. Overall heat-transfer measurements were conducted for a wide range of the mixed-convection parameter, Gr/Re/sup 2/, in the cavity. Smooth transitions were found from natural convection to forced convection. The mixed convection regime was found in 0.5 < Gr/Re/sup 2/ < 80, the upper found of 80 being larger than that of flat plate data (about 10). This was probably due to heat-transfer enhancement by the TGL vortices.

Rhee, H.S.

1987-01-01

73

Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to High Momentum Transfer  

SciTech Connect

The electromagnetic form factors of the nucleon characterize the effect of its internal structure on its response to an electromagnetic probe as studied in elastic electronnucleon scattering. These form factors are functions of the squared four-momentum transfer Q2 between the electron and the proton. The two main classes of observables of this reaction are the scattering cross section and polarization asymmetries, both of which are sensitive to the form factors in different ways. When considering large f momentum transfers, double-polarization observables offer superior sensitivity to the electric form factor. This thesis reports the results of a new measurement of the ratio of the electric and magnetic form factors of the proton at high momentum transfer using the recoil polarization technique. A polarized electron beam was scattered from a liquid hydrogen target, transferring polarization to the recoiling protons. These protons were detected in a magnetic spectrometer which was used to reconstruct their kinematics, including their scattering angles and momenta, and the position of the interaction vertex. A proton polarimeter measured the polarization of the recoiling protons by measuring the azimuthal asymmetry in the angular distribution of protons scattered in CH2 analyzers. The scattered electron was detected in a large acceptance electromagnetic calorimeter in order to suppress inelastic backgrounds. The measured ratio of the transverse and longitudinal polarization components of the scattered proton is directly proportional to the ratio of form factors GpE=GpM. The measurements reported in this thesis took place at Q2 =5.2, 6.7, and 8.5 GeV2, and represent the most accurate measurements of GpE in this Q2 region to date.

Andrew Puckett

2010-02-01

74

Electromagnetic processes at low momentum transfer : a review for users  

NASA Astrophysics Data System (ADS)

Electromagnetic processes at low momentum transfer are often sources of background in many experiments. To be removed these effects must be calculated by the experimentalist, who must have a good knowledge of the validity of the theoretical formulas that he must use. Then we thought that it will be useful to prepare this review whose presentation is such that it should allow everyone to appreciate the accuracy of formulas that he must use in very complex situations. In this paper, we examine the problem related to bremsstrahlung, pair production and radiative corrections. The first part is devoted to kinematic and to the methods used to establish the corresponding cross sections. Les phénomènes électromagnétiques à faible transfert d'impulsion interviennent dans de nombreuses expériences comme des phénomènes parasites. Pour les éliminer, l'expérimentateur doit les calculer, mais il connait généralement mal la validité des formules théoriques qu'il doit alors utiliser. Il nous a donc paru utile de faire une revue dont la présentation doit permettre à chacun d'apprécier la précision des formules qu'il doit appliquer dans des situations très souvent complexes. Dans cet article, nous faisons le point, tant pour la théorie que pour l'expérience, en ce qui concerne : le rayonnement de freinage, la production de paires et les corrections radiatives. La première partie est consacrée à la cinématique des processus appréciés et aux méthodes permettant d'établir les sections efficaces correspondantes.

Parizet, M. J.; Borie, E.; Grossetête, B.; Isabelle, D. B.; Proriol, J.

75

Large time behavior for the support of momentum density of the Camassa-Holm equation  

NASA Astrophysics Data System (ADS)

In this paper we study the large time behavior for the support of momentum density of the Camassa-Holm equation. More precisely, we deduce the limit of the support of momentum density as t goes to +? in some sense.

Jiang, Zaihong; Zhou, Yong; Zhu, Mingxuan

2013-08-01

76

Optical model description of momentum transfer in relativistic heavy ion collisions  

SciTech Connect

An optical model description of momentum transfer in relativistic heavy ion collisions, based upon composite particle multiple-scattering theory, is presented. The imaginary component of the complex momentum transfer, which comes from the absorptive part of the optical potential, is shown to be the main contributor to the momentum loss of the projectile. Within the context of the Goldhaber formalism, predictions of fragment momentum distribution observables are made and compared with experimental data. Use of the model as a tool for estimating collision impact parameters is also discussed.

Khan, F.; Khandelwal, G.S. (Physics Department, Old Dominion University, Norfolk, Virginia (USA)); Townsend, L.W.; Wilson, J.W. (NASA Langley Research Center, Hampton, Virginia (USA)); Norbury, J.W. (Department of Physics, Rider College, Lawrenceville, New Jersey (USA))

1991-03-01

77

Real Part of the Amplitude in Elastic Pp Scattering at Small Momentum Transfers.  

National Technical Information Service (NTIS)

The parametrization of the ratio of real and imaginary parts of nuclear amplitude rho in elastic pp scattering at small momentum transfers t is proposed. Experimental data on the differential cross sections of pp-elastic scattering in the momentum range o...

Z. M. Zlatanov

1980-01-01

78

Spin absorption, windmill, and magneto-optic effects in optical angular momentum transfer  

NASA Astrophysics Data System (ADS)

Laser beams exert torque on microparticles through very different physical mechanisms. In this paper, optical angular momentum transferred by laser light to a trapped absorbing superparamagnetic microsphere has been studied, distinguishing between different contributions. We have found the main contribution to the torque arising from the transfer of the spin angular momentum carried by absorbed laser light. Detailed polarization status contribution of the laser light to the momentum transfer has been then analyzed. A general method to separate and quantify contributions to the optical angular momentum transferred has been developed. We have thus quantified contributions due to radiation pressure, through an effect similar to the wind on a windmill, and contributions arising from magneto-optic effects.

Normanno, Davide; Capitanio, Marco; Pavone, Francesco Saverio

2004-11-01

79

Acceleration Effects in Momentum Transfer Modeling for Dispersed-Flow Conditions.  

National Technical Information Service (NTIS)

The report investigates the effect of accelerating flow conditions on the momentum transfer modeling between particles (droplets or bubbles) and a surrounding fluid. Solutions are obtained for the motion of a single spherical particle subject to a shock-w...

E. J. Chapyak

1981-01-01

80

Momentum transfer in asteroid impacts. I. Theory and scaling  

NASA Astrophysics Data System (ADS)

When an asteroid experiences an impact, its path is changed. How much it changes is important to know for both asteroid evolution studies and for attempts to prevent an asteroid from impacting the Earth. In an impact process the total momentum of the material is conserved. However, not all of the material is of interest, but only that remaining with the asteroid. The ratio of the change of momentum of the remaining asteroid to that of the impactor is called the momentum multiplication factor; and is commonly given the symbol ?. It has been known for some time that ? can be greater than unity, and in some cases far greater. That could be a significant factor in attempts to deflect an asteroid with an impact, and can also be important in the stirring of objects in the asteroid belt due to mutual impacts. The escaping crater ejecta are the source of the momentum multiplication. Housen and Holsapple (Housen, K.R., Holsapple, K.A. [2011a]. Icarus 211, 856-875) have given a recent summary of ejecta characteristics and scaling. Here we use those ejecta results to determine how ? depends on the impactor properties, on the asteroid size and composition, and establish the paths and time of flight of all of the ejecta particles. The approach is to add the contribution of each element of ejected mass accounting for its initial velocity, its trajectory and whether it escapes the asteroid. The goal in this paper is to provide a theoretical framework of the fundamental results which can be used as a test of the veracity of experiments and detailed numerical calculations of impacts. A subsequent paper will present direct laboratory results and numerical simulations of momentum multiplication in various geological materials.

Holsapple, Keith A.; Housen, Kevin R.

2012-11-01

81

Turbulence management using riblets for heat and momentum transfer  

Microsoft Academic Search

Experiments were carried out in a low-speed wind tunnel to investigate the heat-transfer characteristics of triangular-profiled riblet surfaces by comparing them with those of a smooth surface of an identical construction in a thermal turbulent boundary layer. The results of careful heat-transfer measurements indicate that the heat-transfer coefficient over riblet surfaces is increased from that of a smooth surface by

K.-S Choi; D. M Orchard

1997-01-01

82

Development of turbulent wall layer models for momentum and heat transfer in tube flow  

Microsoft Academic Search

The surface renewal and penetration concept is the basis for turbulent transport models developed for several turbulent tube flow processes characterized by dominant wall layer turbulence phenomena. The analytical models developed include: (1) unified momentum and heat transfer models that are applicable for laminar, transitional, and fully developed turbulent flow. The heat transfer model is limited to moderate Prandtl number

C. R. Kakarala

1976-01-01

83

Momentum: The 2005 Report on University Research and Knowledge Transfer  

ERIC Educational Resources Information Center

|This 2005 report on university research and knowledge transfer report by the Association of Universities and Colleges of Canada (AUCC) on the collective efforts of universities with respect to research and knowledge transfer is the first periodic public report by the AUCC on the collective efforts of universities with respect to research and…

Association of Universities and Colleges of Canada, 2005

2005-01-01

84

An instrument for direct measurements of sputtering related momentum transfer to targets  

NASA Astrophysics Data System (ADS)

The article presents an instrument that measures sputtering related momentum transfer to a target. The instrument is operated in the beam of a broad-beam ion source and its main part is similar to a rotor of a wind mill. One component of the transferred momentum perpendicular to the beam is converted into a rotational movement of its rotor. This geometry makes the device sensitive to the momentum of sputtered target atoms and reflected beam particles, but insensitive for the momentum of the impinging particles itself. Exemplary measurements with argon ions in the energy range from 0.5 keV to 1.5 keV impinging onto copper targets at an incidence angle of 56° are presented. The results are compared with simulations based on the popular Monte-Carlo program TRIM and show a good agreement.

Rutscher, J.; Trottenberg, Th.; Kersten, H.

2013-04-01

85

Coherent transfer of orbital angular momentum from an atomic system to a light field  

SciTech Connect

We generated orbital angular momentum in atoms with a spin degree of freedom and coherently transferred it to a light field, which resulted in the generation of a Laguerre-Gaussian (LG) beam. In this method, atoms obtain orbital angular momentum through Larmor precession around the quadrupole field. Successive operations of quadrupole and homogeneous magnetic fields lead to a change of sign in the LG beam or even generation of superposition states of the LG beam with different indexes in real time. Possible applications to control orbital angular momentum of arbitrary photons are also discussed.

Akamatsu, Daisuke; Kozuma, Mikio [Department of Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550 (Japan)

2003-02-01

86

Measurement of quasi-elastic 12 C(p,2p) scattering at high momentum transfer  

Microsoft Academic Search

We measured the high-momentum transfer [Q2=4.8 and 6.2 (GeV\\/c)2] quasi-elastic 12C(p,2p) reaction at ?cm?90° for 6 and 7.5 GeV\\/c incident protons. The momentum components of both outgoing protons and the missing energy and momentum of the proton in the nucleus were measured. We verified the validity of the quasi-elastic picture for ground state momenta up to about 0.5 GeV\\/c. Transverse

Y. Mardor; J. Aclander; J. Alster; D. Barton; G. Bunce; A. Carroll; N. Christensen; H. Courant; S. Durrant; S. Gushue; S. Heppelmann; E. Kosonovsky; I. Mardor; M. Marshak; Y. Makdisi; E. D. Minor; I. Navon; H. Nicholson; E. Piasetzky; T. Roser; J. Russell; C. S. Sutton; M. Tanaka; C. White; J-Y Wu

1998-01-01

87

Effect of large ion angular momentum spread and high current on inertial electrostatic confinement potential structures  

Microsoft Academic Search

Prior inertial electrostatic confinement (IEC) studies have assumed that very low angular momentum (zero in the ideal case) is necessary to achieve a potential well structure capable of trapping energetic ions in the center of a spherical device. However, the present study shows that high-current ion beams having large-angular-momentum spread can also form deep potential well traps

Ivon V. Tzonev; John M. DeMora; George H. Miley

1995-01-01

88

New Precision Measurements of Deuteron Structure Function A(Q) at Low Momentum Transfer  

SciTech Connect

Differences between previous measurements of low momentum transfer electron-deuteron elastic scattering prevent a clean determination of even the sign of the leading low momentum transfer relativistic corrections, or of the convergence of chiral perturbation theory. We have attempted to resolve this issue with a new high-precision measurement in Jefferson Lab Hall A. Elastic electron scattering was measured on targets of tantalum, carbon, hydrogen, and deuterium at beam energy of 685 MeV. The four-momentum transfer covered the range of 0.15 - 0.7 GeV. The experiment included a new beam calorimeter, to better calibrate the low beam currents used in the experiment, and new collimators to better define the spectrometer solid angles. We obtained cross sections of deuteron as ratios to hydrogen cross sections. A fit function of B(Q) world data is newly made and subtracted from cross sections to find values of A(Q).

Byungwuek Lee

2009-08-01

89

Photoproduction of Large Transverse Momentum Dimuonium (?+?-) in Relativistic Heavy Ion Collisions  

NASA Astrophysics Data System (ADS)

The photoproduction processes of large transverse momentum (pT) dimuonium (?+?-) in AA collisions is calculated. We argue that the modification of electromagnetic radiation processes at large transverse momentum (pT > 2 GeV). Through perturbative quantum chromodynamics (pQCD) calculation, we determine the electromagnetic production cross section of large transverse momentum dimuonium (?+?-) in quark-gluon plasma (QGP) at RHIC and LHC. The numerical results indicate that the contribution of photoproduction processes of dimuonium is evident in relativistic heavy ion collisions at RHIC energies and LHC energies.

Yu, Gong-Ming; Li, Yun-De

2013-01-01

90

Unusual angular momentum transfer in electron-impact excitation of neon  

NASA Astrophysics Data System (ADS)

We report results from a joint experimental and theoretical study of the angular momentum transfer in electron-impact excitation of the (2p6)1S0?(2p53s)1P1 resonance transition in Ne. Both the measured and calculated data show the circular light polarization P3 to be positive for an incident energy of 25 eV at scattering angles below 40?. This observation implies a negative angular momentum transfer L?, which is the opposite sign of orientation expected from a well-known propensity rule for S?P excitation at small scattering angles.

Hargreaves, L. R.; Campbell, C.; Khakoo, M. A.; Zatsarinny, Oleg; Bartschat, Klaus

2012-05-01

91

Analysis of heat, mass, and momentum transfer in the rain zone of counterflow cooling towers  

SciTech Connect

The rate of heat, mass and momentum transfer in the rain zone of three counterflow cooling tower geometries is analyzed using simplifying assumptions and numerical integration. The objective of the analysis is to generate equations for use in a one-dimensional mathematical cooling tower performance evaluations. Droplet deformation is taken into account and momentum transfer is calculated from the air flow's mechanical energy loss, caused by air-droplet interaction. A comparison of dimensionless semi-empirical equations and experimental data demonstrates the method's capability to predict the pressure drop in a counterflow rain zone.

Villiers, E. de; Kroeger, D.G.

1999-10-01

92

Numerical study of momentum and heat transfer in unsteady impinging jets  

Microsoft Academic Search

Direct numerical simulations of an unsteady impinging jet are performed to study momentum and heat transfer characteristics. The unsteady compressible Navier–Stokes equations are solved using a high-order finite difference method with non-reflecting boundary conditions. It is found that the impingement heat transfer is very unsteady and the unsteadiness is caused by the primary vortices emanating from the jet nozzle. These

Y. M. Chung; K. H. Luo; N. D. Sandham

2002-01-01

93

Positronium-atom\\/Molecule interactions: Momentum-Transfer Cross Sections and Z eff  

Microsoft Academic Search

An overview is presented of current results on the measurements of the momentum-transfer cross sections for positronium -\\u000a atom\\/molecule scattering and the effective numbers of electrons per atom\\/molecule for positronium pickoff annihilation (1Zeff).

Y. Nagashima; F. Saito; N. Shinohara; T. Hyodo

94

Elastic Electron Scattering from 3He and 4He at High Momentum Transfer  

Microsoft Academic Search

Experimental values of 3He (4He) elastic structure functions up to momentum transfer q2=4.0 (2.4) (GeV\\/c)2 are presented. They are compared to calculations using three- and four-body wave functions and to asymptotic models.

R. G. Arnold; B. T. Chertok; S. Rock; W. P. Schuetz; Z. M. Szalata; D. Day; J. S. McCarthy; F. Martin; B. A. Mecking; I. Sick; G. Tamas

1978-01-01

95

Angular-momentum-transfer formalism for photoionization of excited rare-gas atoms  

NASA Astrophysics Data System (ADS)

Expressions for photoionization channel amplitudes are derived applying the Dill and Fano angular-momentum-transfer formalism to the j-l coupling scheme. This expression will be useful in understanding excited-state photoeffects of rare-gas atoms. The situation in which the present formula reduces to that of the Cooper-Zare model is also discussed.

Kim, Young Soon

1988-03-01

96

Complex chain of momentum transfer of body segments in the baseball pitching motion  

Microsoft Academic Search

Baseball pitching requires contributions from and interaction among all limb segments. Most previous investigators have concentrated on the throwing arm itself, but the center of mass (COM) and contribution of all segments in the pitching motion have not been studied. The purpose of this study was to investigate the momentum transfer of all body segments in the pitching motion. The

Mari Nakamura; Edmund Y. S. Chao

2003-01-01

97

Electromagnetic form factors of pseudoscalar mesons at low momentum transfer in quantum chromodynamics  

SciTech Connect

The finite-energy sum-rule technique and the generalized operator expansion are used to determine the behavior of the electromagnetic form factors of ..pi../sup +/, K/sup +/, and K/sup 0/ mesons at small momentum transfer < or approx. =0.7 GeV/sup 2/ in quantum chromodynamics.

Krasulin, A.B.; Matveev, V.A.; Chetyrkin, K.G.

1985-03-10

98

Neutron Form Factors from Elastic Electron-Deuteron Scattering Ration Experiments at Very Low Momentum Transfer.  

National Technical Information Service (NTIS)

Measurements of the ratio of the elastic electron-deuteron scattering cross section to the elastic electron-proton scattering cross section were made for low momentum transfers. Augmented by the work of Topping these data span a range of (q sup 2) from 0....

R. W. Berard T. J. Traverso

1973-01-01

99

Prospect for Measuring GNE at High Momentum Transfers  

NASA Astrophysics Data System (ADS)

Experiment E02-013, approved by PAC21, will measure the neutron electric form factor at Q2 up to 3.4 (GeV/c)2, which is twice that achieved to date. The main features of the new experiment will be the use of the electron spectrometer BigBite, a large array of neutron detectors, and a polarized 3vec{He} target. We present the parameters and optimization of the experimental setup. A concept of an experiment for GnE where precision GpE data is used for calibration of the systematics of a Rosenbluth type measurement is also discussed.

Wojtsekhowski, B.

2002-12-01

100

Higher-Twist Dynamics in Large Transverse Momentum Hadron Production  

SciTech Connect

A scaling law analysis of the world data on inclusive large-p{perpendicular} hadron production in hadronic collisions is carried out. Significant deviations from leading-twist perturbative QCD predictions at next-to-leading order are observed, particularly at high x{perpendicular} = 2p {perpendicular}/{radical}s. In contrast, the production of prompt photons and jets exhibits near-conformal scaling behavior in agreement with leading-twist expectations. These results indicate a non-negligible contribution of higher-twist processes in large-p{perpendicular} hadron production, where the hadron is produced directly in the hard subprocess, rather than by quark and gluon fragmentation. Predictions for the scaling exponents at RHIC and LHC are given. Triggering on isolated large-p{perpendicular} hadron production will enhance the higher-twist processes. We also note that the use of isolated hadrons as a signal for new physics can be affected by the presence of direct hadron production.

Arleo, F.; Brodsky, S.; Hwang, D.; Sickles, A.

2010-08-06

101

Higher-twist dynamics in large transverse momentum hadron production.  

PubMed

A scaling law analysis of the world data on inclusive large-p(?) hadron production in hadronic collisions is carried out. Significant deviations from leading-twist perturbative QCD predictions at next-to-leading order are observed, particularly at high x(?)=2p(?)/sqrt[s]. In contrast, the production of prompt photons and jets exhibits near-conformal scaling behavior in agreement with leading-twist expectations. These results indicate a non-negligible contribution of higher-twist processes in large-p(?) hadron production, where the hadron is produced directly in the hard subprocess, rather than by quark and gluon fragmentation. Predictions for the scaling exponents at RHIC and LHC are given. Triggering on isolated large-p(?) hadron production will enhance the higher-twist processes. We also note that the use of isolated hadrons as a signal for new physics can be affected by the presence of direct hadron production. PMID:20867975

Arleo, François; Brodsky, Stanley J; Hwang, Dae Sung; Sickles, Anne M

2010-08-06

102

Trans-Spectral Orbital Angular Momentum Transfer via Four-Wave Mixing in Rb Vapor  

NASA Astrophysics Data System (ADS)

We report the transfer of phase structure and, in particular, of orbital angular momentum from near-infrared pump light to blue light generated in a four-wave-mixing process in Rb85 vapor. The intensity and phase profile of the two pump lasers at 780 and 776 nm, shaped by a spatial light modulator, influences the phase and intensity profile of light at 420 nm, which is generated in a subsequent coherent cascade. In particular, we observe that the phase profile associated with orbital angular momentum is transferred entirely from the pump light to the blue. Pumping with more complicated light profiles results in the excitation of spatial modes in the blue that depend strongly on phase matching, thus demonstrating the parametric nature of the mode transfer. These results have implications on the inscription and storage of phase information in atomic gases.

Walker, G.; Arnold, A. S.; Franke-Arnold, S.

2012-06-01

103

Optical vortices with large orbital momentum: generation and interference.  

PubMed

We demonstrate a method for generation of beams of light with large angular momenta. The method utilizes whispering gallery mode resonators that transform a plane electromagnetic wave into high order Bessel beams. Interference pattern among the beams as well as shadow pictures induced by the beams are observed and studied. PMID:19516426

Savchenkov, Anatoliy A; Matsko, Andrey B; Grudinin, Ivan; Savchenkova, Ekaterina A; Strekalov, Dmitry; Maleki, Lute

2006-04-01

104

Kaon electroproduction at large four-momentum transfer  

SciTech Connect

Exclusive H(e,e'K)Y data were taken in January, March and April of 2001 at the Jefferson Lab Hall A. The electrons and kaons were detected in coincidence in the hall's two High Resolution Spectrometers (HRS). The kaon arm of the pair had been specifically outfitted with two aerogel Cerenkov threshold detectors, designed to separately provide pion and proton particle identification thus allowing kaon identification. Preliminary data show the cross section's dependence on the invariant mass, W, along with results of systematic studies. Ultimately the data will be used to perform a Rosenbluth Separation as well, separating the longitudinal from the transverse response functions.

Pete Markowitz

2003-06-16

105

Charge Form Factor of the Neutron at Low Momentum Transfer from the H?2(e?,e'n)H1 Reaction  

NASA Astrophysics Data System (ADS)

We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons at an energy of 850 MeV were scattered from an isotopically pure, highly polarized deuterium gas target. The scattered electrons and coincident neutrons were measured by the Bates Large Acceptance Spectrometer Toroid (BLAST) detector. The neutron form factor ratio GEn/GMn was extracted from the beam-target vector asymmetry AedV at four-momentum transfers Q2=0.14, 0.20, 0.29, and 0.42(GeV/c)2.

Geis, E.; Kohl, M.; Ziskin, V.; Akdogan, T.; Arenhövel, H.; Alarcon, R.; Bertozzi, W.; Booth, E.; Botto, T.; Calarco, J.; Clasie, B.; Crawford, C. B.; Degrush, A.; Donnelly, T. W.; Dow, K.; Farkhondeh, M.; Fatemi, R.; Filoti, O.; Franklin, W.; Gao, H.; Gilad, S.; Hasell, D.; Karpius, P.; Kolster, H.; Lee, T.; Maschinot, A.; Matthews, J.; McIlhany, K.; Meitanis, N.; Milner, R. G.; Rapaport, J.; Redwine, R. P.; Seely, J.; Shinozaki, A.; Širca, S.; Sindile, A.; Six, E.; Smith, T.; Steadman, M.; Tonguc, B.; Tschalaer, C.; Tsentalovich, E.; Turchinetz, W.; Xiao, Y.; Xu, W.; Zhang, C.; Zhou, Z.; Zwart, T.

2008-07-01

106

Higher-Twist Dynamics in Large Transverse Momentum Hadron Production  

SciTech Connect

A scaling law analysis of the world data on inclusive large-p{sub {perpendicular}} hadron production in hadronic collisions is carried out. A significant deviation from leading-twist perturbative QCD predictions at next-to-leading order is reported. The observed discrepancy is largest at high values of x{sub {perpendicular}} = 2p{sub {perpendicular}}/{radical}s. In contrast, the production of prompt photons and jets exhibits the scaling behavior which is close to the conformal limit, in agreement with the leading-twist expectation. These results bring evidence for a non-negligible contribution of higher-twist processes in large-p{sub {perpendicular}} hadron production in hadronic collisions, where the hadron is produced directly in the hard subprocess rather than by gluon or quark jet fragmentation. Predictions for scaling exponents at RHIC and LHC are given, and it is suggested to trigger the isolated large-p{sub {perpendicular}} hadron production to enhance higher-twist processes.

Arleo, Francois; /Annecy, LAPTH; Brodsky, Stanley J.; /SLAC; Hwang, Dae Sung; /Sejong U.; Sickles, Anne M.; /Brookhaven

2009-12-17

107

Electron Transfer for Large Molecules through Delocalization  

SciTech Connect

Electron transfer for large molecules lies in between a Marcus-Theory two-state transfer and a Landauer description. We discuss a delocalization formalism which,through the introduction of artificial electric fields which emulate bulk dipole fields, allows calculation between a pair of identical molecules (A+A- (R)A-+A) with several open states. Dynamical electron polarization effects can be inserted with TDDFT and are crucial for large separations.

Neuhauser, D.; Reslan, R.; Hernandez, S.; Arnsen, C.; Lopata, K.; Govind, N.; Gao, Y.; Tolbert, S.; Schwartz, B.; Rubin, Y.; Nardes, A.; Kopidakis, N.

2012-01-01

108

Electromagnetic Effects in the Production of Dimuons at Large Transverse Momentum  

Microsoft Academic Search

The effects of single photon corrections to the Drell-Yan mechanism are studied for massive dimuons at large transverse momentum. We present the results of numerical calculations using phenomenological quark distribution functions for both p anti p and ..pi.. anti p collisions. In certain regions of phase space, photon radiation from the muons leads to an unexpectedly large enhancement of the

Dean Laverne Preston

1980-01-01

109

Optimal spin-quantization axes for quarkonium with large transverse momentum  

SciTech Connect

The gluon collision process that creates a heavy-quark-antiquark pair with small relative momentum and large transverse momentum predicts at leading-order in the QCD coupling constant that the transverse polarization of the pair should increase with its transverse momentum. Measurements at the Fermilab Tevatron of the polarization of charmonium and bottomonium states with respect to a particular spin-quantization axis are inconsistent with this prediction. However the predicted rate of approach to complete transverse polarization depends on the choice of spin-quantization axis. We introduce axes that maximize and minimize the transverse polarization from the leading-order gluon collision process. They are determined by the direction of the jet that provides most of the balancing transverse momentum.

Braaten, Eric; Kang, Daekyoung [Physics Department, Ohio State University, Columbus, Ohio 43210 (United States); Lee, Jungil; Yu, Chaehyun [Department of Physics, Korea University, Seoul 136-701 (Korea, Republic of)

2009-03-01

110

Search for Events with Isolated Leptons and Large Missing Transverse Momentum  

SciTech Connect

Events with isolated leptons and large missing transverse momentum are searched for in the e+p and e-p data recorded by the H1 experiment at HERA. In previous analyses of the HERA I e+p data (L = 104.7 pb-1), an excess of events with isolated electrons or muons and large missing transverse momentum was found. No significant excess was found in the HERA I e-p data (L = 13.6 pb-1). In the following, new results of the search for events with isolated leptons and large missing transverse momentum in the HERA II e+p and e-p datasets are presented. The analysed HERA II data correspond to integrated luminosities of 53 pb-1 and 21 pb-1 in e+p and e-p collisions, respectively.

Veelken, Christian [Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg (Germany)

2005-10-06

111

Measurement of elastic electron scattering from the proton at high momentum transfer  

Microsoft Academic Search

We have performed absolute measurements of the differential cross section for elastic e-p scattering in the range of momentum transfer from Q2=2.9 to 31.3 (GeV\\/c)2. Combined statistical and systematic uncertainties in the cross-section measurements ranged from 3% at low Q2 to 19% at high Q2. These data have been used to extract the proton magnetic form factor GpM(Q2). The results

R. G. Arnold; P. E. Bosted; C. C. Chang; J. Gomez; A. T. Katramatou; C. J. Martoff; G. G. Petratos; A. A. Rahbar; S. E. Rock; A. F. Sill; Z. M. Szalata; D. J. Sherden; J. M. Lambert; R. M. Lombard-Nelsen

1986-01-01

112

Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector  

Microsoft Academic Search

It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM $\\\\rho_m$ and constant equation of state of DE $w_d$ suffered from instabilities of the density perturbations on the supper-Hubble scales. Here we suggest a new covariant model for the energy-momentum transfer between CDM and DE. Then

Cheng-Yi Sun; Yu Song; Rui-Hong Yue

2011-01-01

113

Optical Fréedericksz transition in liquid crystals and transfer of the orbital angular momentum of light  

NASA Astrophysics Data System (ADS)

Multistability, out-of-polarization-plane reorientation, and persistent oscillations have been observed in the optical Fréedericks transition in a homeotropically aligned nematic film using a normally incident linearly polarized laser beam with elliptical rather than circular cross section. These features could be ascribed to the presence of an additional optical torque connected with a transfer of the orbital angular momentum of light to the liquid crystal film. A model based on Ritz’s variational method confirms this picture.

Piccirillo, Bruno; Vella, Angela; Santamato, Enrico

2004-02-01

114

Optical Fréedericksz transition in liquid crystals and transfer of the orbital angular momentum of light.  

PubMed

Multistability, out-of-polarization-plane reorientation, and persistent oscillations have been observed in the optical Fréedericks transition in a homeotropically aligned nematic film using a normally incident linearly polarized laser beam with elliptical rather than circular cross section. These features could be ascribed to the presence of an additional optical torque connected with a transfer of the orbital angular momentum of light to the liquid crystal film. A model based on Ritz's variational method confirms this picture. PMID:14995464

Piccirillo, Bruno; Vella, Angela; Santamato, Enrico

2004-02-17

115

Spin angular momentum transfer from TEM(00) focused Gaussian beams to negative refractive index spherical particles.  

PubMed

We investigate optical torques over absorbent negative refractive index spherical scatterers under the influence of linear and circularly polarized TEM(00) focused Gaussian beams, in the framework of the generalized Lorenz-Mie theory with the integral localized approximation. The fundamental differences between optical torques due to spin angular momentum transfer in positive and negative refractive index optical trapping are outlined, revealing the effect of the Mie scattering coefficients in one of the most fundamental properties in optical trapping systems. PMID:21833372

Ambrosio, Leonardo A; Hernández-Figueroa, Hugo E

2011-07-22

116

Observation of dynamical localization in atomic momentum transfer: A new testing ground for quantum chaos  

NASA Astrophysics Data System (ADS)

We report a direct observation of dynamical localization. This effect is a quantum suppression of diffusion in a system that is classically chaotic. Our experiment measures the momentum transferred from a modulated standing wave of a near-resonant laser to a sample of ultracold atoms and is a realization of a periodically driven rotor. The conceptual simplicity and experimental control over the time dependent Hamiltonian make this system an ideal testing ground for the predictions of quantum chaos.

Moore, F. L.; Robinson, J. C.; Bharucha, C.; Williams, P. E.; Raizen, M. G.

1994-11-01

117

The Determination of m\\/e for Free Electrons by Momentum Transfer  

Microsoft Academic Search

A new method for measuring m\\/e for free electrons has been developed by using momentum transfer. A Faraday cage mounted on a torsion device collects electrons from an electron gun. The change in maximum angular displacement of the fibre with electron beam on and off together with the measured current gave a value of m\\/e of 5.82 × 10-12 kg

H. A. Daw; F. S. Jr. Harris

1961-01-01

118

Momentum-transfer dependence of ionization cross sections for C6++He collisions  

NASA Astrophysics Data System (ADS)

In this work we study the dependence of the fully differential cross sections (FDCS) for single ionization of He by 100 MeV/amu C6+ on the momentum transferred by the projectile to the target. Three dimensional plots of the FDCS are used to illustrate how the different configurations contribute when the theoretical results are convoluted over the experimental uncertainties. This convolution is shown to be essential in order to properly reproduce the measured data.

Fiol, J.; Otranto, S.; Olson, R. E.

2007-03-01

119

Measurement of the 6Li(e,e'p) reaction cross sections at low momentum transfer  

NASA Astrophysics Data System (ADS)

The triple differential cross sections for the 6Li(e,e'p) reaction have been measured in the excitation energy range from 27 to 46 MeV in a search for evidence of the giant dipole resonance (GDR) in 6Li. The cross sections have no distinct structures in this energy region, and decrease smoothly with the energy transfer. Angular distributions are different from those expected with the GDR. Protons are emitted strongly in the momentum-transfer direction. The data are well reproduced by a DWIA calculation assuming a direct proton knockout process.

Hotta, T.; Tamae, T.; Miura, T.; Miyase, H.; Nakagawa, I.; Suda, T.; Sugawara, M.; Tadokoro, T.; Takahashi, A.; Tanaka, E.; Tsubota, H.

1999-01-01

120

The impulsive effects of momentum transfer on the dynamics of a novel ocean wave energy converter  

NASA Astrophysics Data System (ADS)

In a recent paper by Orazov et al. [On the dynamics of a novel ocean wave energy converter. Journal of Sound and Vibration329 (24) (2010) 5058–5069], a wave energy converter (WEC) was proposed. The converter features a mass modulation scheme and a simple model was used to examine its efficacy. The simple model did not adequately account for the momentum transfer which takes place during the mass modulation. The purpose of the present paper is to account for this transfer and to show that the WEC equipped with a novel and more general mass modulation scheme has the potential to improve its energy harvesting capabilities.

Diamond, Christopher A.; O'Reilly, Oliver M.; Sava?, Ömer

2013-10-01

121

Research on Attitude Control and Momentum Management (ACMM) of Large Spacecraft  

NASA Astrophysics Data System (ADS)

Control moment gyro (CMG) is usually used as primary apparatus to control attitude for large spacecraft, such as space station etc. But, inner moment arisen by CMG during control process will cause redistributing and adjusting of angle momentum. This phenomenon will result in saturation of angle momentum due to accumulation of angle momentum of CMG along with time passing. In this paper, the statistical model of moment disturbance of exterior environment of large spacecraft is studied. The model that is used for disturbance restrain is built. The mutual inherent effect and performance balance between attitude angle momentum and disturbance are discussed. An integrated model of ACMM which has considered disturbance moment is presented. Then the ooptimal LQR is used to synthesize the optimized controller of poly-variable for ACMM. Better response behavior of the closed loop is acquired by the method of regional pole assignment. The disturbance restraint based on the torque equilibrium attitude (TEA) is discussed; the control model of disturbance restraint is built. Finally, the simulations are carried out including model of system, the control law, disturbance restrain filter including its robustness and design of digital controller involving its performance and so on. Results indicate that the models and algorithm stated above are feasible. Subject Terms: rendezvous and docking (RVD), Control moment gyro (CMG), attitude control and momentum management (ACMM), torque equilibrium attitude (TEA)

Yuan, Jianping; Li, Wenhua; Hu, Shan

122

Tensor polarization of the deuteron at high momentum transfer in elastic (e, d) scattering  

NASA Astrophysics Data System (ADS)

The measurement of deuteron tensor polarization using (e, d) elastic scattering was performed in Hall C, Jefferson Lab by the t20 collaboration at four- momentum transfers of 4.10, 4.46, 5.08, 5.48, 6.23 and 6.65 fm-1. The scattered electrons were detected by the High Momentum Spectrometer, and a specially designed magnetic channel was used to detect deuterons in coincidence. The polarization of the recoil deuterons was measured in the polarimeter POLDER, using 1H( d-> ,2p)n reaction. A 12 cm liquid deuterium target was used for ( e, d) elastic scattering, and the second scattering took place in a 20 cm liquid hydrogen target in POLDER. The deuteron arm was fixed at 60.5° while the electron arm angle ?e was changed with different beam energies to obtain different momentum transfers. The extracted values of t20(GC, GQ,GM,? e), combined with the structure functions A( GC,GQ,GM) measured in this experiment and the world data of B( GM), were used to separate the charge monopole form factor GC and charge quadrupole form factor GQ of the deuteron. The extracted values of t20 were compared to predictions of different theoretical models of the electromagnetic form factors of the deuteron. The present data favor the calculations of the ``nucleon-only'' models with the inclusion of the relativistic effects and the meson exchange currents. The position of the node in the GC form factor from the present experiment is somewhat lower in four-momentum transfer than in a previous Bates measurement. This tends to give a more consistent position of the node in GC for the two-nucleon and the three-nucleon systems. The need for more precise polarization data in the four-momentum transfer range of the node in GC is discussed. (Copies available exclusively from MIT Libraries, Rm. 14- 0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.)

Zhao, Wenxia

123

Rotating fiber array molecular driver and molecular momentum transfer device constructed therewith  

DOEpatents

A rotating fiber array molecular driver is disclosed which includes a magnetically suspended and rotated central hub to which is attached a plurality of elongated fibers extending radially therefrom. The hub is rotated so as to straighten and axially extend the fibers and to provide the fibers with a tip speed which exceeds the average molecular velocity of fluid molecules entering between the fibers. Molecules colliding with the sides of the rotating fibers are accelerated to the tip speed of the fiber and given a momentum having a directional orientation within a relatively narrow distribution angle at a point radially outward of the hub, which is centered and peaks at the normal to the fiber sides in the direction of fiber rotation. The rotating fiber array may be used with other like fiber arrays or with other stationary structures to form molecular momentum transfer devices such as vacuum pumps, molecular separators, molecular coaters, or molecular reactors.

Milleron, Norman (1854 San Juan, Berkeley, CA 94707)

1983-01-01

124

Tensor polarization in elastic electron-deuteron scattering to the highest possible momentum transfers  

SciTech Connect

In elastic electron-deuteron scattering, the tensor polarization moments t{sub 20}, t{sub 21} and t{sub 22}, together with the unpolarized cross-sections, have been measured up to a momentum transfer of 1.8 (GeV/c){sup 2}, or 6.8 fm{sup -1}. The experiment was performed at Jefferson Laboratory using the recoil deuteron polarimeter POLDER. Preliminary results are presented and discussed, especially in view of their significance concerning the applicability of perturbative QCD to this exclusive process.

Garcon, M; Ahmidouch, A; Anklin, H; Arvieux, J; Ball, J; Beedoe, S; Beise, E J; Bimbo, L; Boeglin, W; Breuer, H; Carlini, R; Chant, N S; Danagoulian, S; Dow, K; Ducret, J -E; Dunne, J; Ewell, L; Eyraud, L; Furget, C; Gilman, R; Glashausser, C; Gueye, P; Gustafsson, K; Hafidi, K; Honegger, A; Jourdan, J; Kox, S; Kumbartzki, G; Lu, L; Lung, A; Mack, D; Markowitz, P; McIntyre, J; Meekins, D; Merchez, F; Mitchell, J; Mohring, R; Mtingwa, S; Mrktchyan, H; Pitz, D; Qin, L; Ransome, R; Raoul, J -S; Roos, P G; Rutt, P; Schmidt, W; Sawafta, R; Stepanyan, S; Stephenson, R; Tieulent, R; Tomasi-Gustafsson, E

1999-07-01

125

Momentum transfer Cs+/H2 cross section from an inversion of transport data  

NASA Astrophysics Data System (ADS)

Monte Carlo (MC) calculations of Cs+ transport in H2 are performed in order to establish a reliable transport cross section for momentum transfer. This system is important for plasma modeling in the context of the negative ion source design proposed for plasma heating in future nuclear fusion reactors. Two procedures are checked: use of the Langevin approximation based on realistic values of the physical parameters and a purely statistical, multi-parameter function allowing for shape variation at relative high energy. The two alternatives are discussed and final results provided to be used for negative source modeling.

Diomede, Paola; Longo, Savino

2013-05-01

126

Large-eddy Simulation of Turbulent Flow across a Forest Edge. Part II: Momentum and Turbulent Kinetic Energy Budgets  

Microsoft Academic Search

Momentum and turbulent kinetic energy (TKE) budgets across a forest edge have been investigated using large-eddy simulation (LES). Edge effects are observed in the rapid variation of a number of budget terms across this vegetation transition. The enhanced drag force at the forest edge is largely balanced by the pressure gradient force and by streamwise advection of upstream momentum, while

Bai Yang; Andrew P. Morse; Roger H. Shaw; Kyaw Tha Paw U

2006-01-01

127

Electromagnetic effects in the production of dimuons at large transverse momentum  

Microsoft Academic Search

The effects of single-photon corrections to the simple Drell-Yan mechanism (qq --> gamma* --> mu+mu-) are studied for massive dimuons at large transverse momentum in the processes pi-p --> mu+mu-X and pp --> mu+mu-X. It is found that single-photon emission by the muons constitutes an important correction to the effects of single-gluon emission by the quarks for very massive (Mmumu2

Dean L. Preston

1982-01-01

128

Irregular spin angular momentum transfer from light to small birefringent particles  

SciTech Connect

The transfer of spin angular momentum from photons to small particles is a key experiment of quantum physics. The particles rotate clockwise or counterclockwise depending on the polarization of the light beam which holds them in an optical trap. We show that even perfectly disk shaped particles will in general not rotate with a constant angular speed. The particles will periodically accelerate and decelerate their rotational motion due to a varying spin angular momentum transfer from the light. Using the Poincare sphere we derive the equation of motion of a birefringent plate and verify the results by measuring the time dependent rotation of small crystals of Hg(I) iodide and 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) in the trap of polarized optical tweezers. For small ellipticities of the polarized light in the tweezers the plate stops in a fixed orientation relative to the axes of the light ellipse. We discuss the origin of this halt and propose an application of small birefringent plates as self-adjusting optical retarders in micro-optics.

Rothmayer, M.; Tierney, D.; Schmitzer, H. [Department of Physics, Xavier University, 3800 Victory Parkway, Cincinnati, Ohio 45207 (United States); Frins, E. [Facultad de Ingenieria, Instituto de Fisica, J. Herrera y Reissig 565, 11300 Montevideo (Uruguay); Dultz, W. [Physikalisches Institut, Johann Wolfgang Goethe-Universitaet, PF 111932, D-60054, Frankfurt am Main (Germany)

2009-10-15

129

The relative importance of ejections and sweeps to momentum transfer in the atmospheric boundary layer  

NASA Astrophysics Data System (ADS)

Using an incomplete third-order cumulant expansion method (ICEM) and standard second-order closure principles, we show that the imbalance in the stress contribution of sweeps and ejections to momentum transfer (? S o ) can be predicted from measured profiles of the Reynolds stress and the longitudinal velocity standard deviation for different boundary-layer regions. The ICEM approximation is independently verified using flume data, atmospheric surface layer measurements above grass and ice-sheet surfaces, and within the canopy sublayer of maturing Loblolly pine and alpine hardwood forests. The model skill for discriminating whether sweeps or ejections dominate momentum transfer (e.g. the sign of ? S o ) agrees well with wind-tunnel measurements in the outer and surface layers, and flume measurements within the canopy sublayer for both sparse and dense vegetation. The broader impact of this work is that the “genesis” of the imbalance in ? S o is primarily governed by how boundary conditions impact first and second moments.

Katul, Gabriel; Poggi, Davide; Cava, Daniela; Finnigan, John

2006-09-01

130

Modeling Lepton-Nucleon Inelastic Scattering from High to Low Momentum Transfer  

SciTech Connect

We present a model for inclusive charged lepton-nucleon and (anti)neutrino-nucleon cross sections at momentum transfer squared, Q{sup 2}, {approx}1 GeV{sup 2}. We quantify the impact of existing low-Q charged-lepton deep-inelastic scattering (DIS) data on effects due to high-twist operators and on the extraction of parton distribution functions (PDFs). No evidence is found for twist-6 contributions to structure functions (SF), and for a twist-4 term in the longitudinal SF at x > or approx. 0.1. We find that DIS data are consistent with the NNLO QCD approximation with the target mass and phenomenological high twist corrections. For Q{sup 2}<1 GeV{sup 2}, we extend extrapolation of the operator product expansion, preserving the low-Q current-conservation theorems. The procedure yields a good description of data down to Q{sup 2}{approx}0.5 GeV{sup 2}. An updated set of PDFs with reduced uncertainty and applicable down to small momentum transfers in the lepton-nucleon scattering is obtained.

Alekhin, S. [Institute for High Energy Physics, 142281 Protvino, Moscow region (Russian Federation); Kulagin, S. A. [Institute for Nuclear Research, 117312 Moscow (Russian Federation); Petti, R. [Department of Physics and Astronomy, University of South Carolina, Columbia SC 29208 (United States)

2007-12-21

131

Calculation of turbulent momentum and heat transfer in pipe flows of incompressible liquids and gases with variable physical properties  

Microsoft Academic Search

A method is developed for the calculation of momentum and heat transfer in fluids with constant or variable properties; the main feature of the method is that it does not give an explicit formulation of the turbulence scale. The characteristics of turbulent flow and heat transfer are calculated for two cases: (1) the flow of a liquid with constant physical

P. L. Maksin; B. S. Petukhov; A. F. Poliakov

1980-01-01

132

R×B drift momentum spectrometer with high resolution and large phase space acceptance.  

PubMed

We propose a new type of momentum spectrometer, which uses the R×B drift effect to disperse the charged particles in a uniformly curved magnetic field, and measures the particles with large phase space acceptance and high resolution. This kind of R×B spectrometer is designed for the momentum analyses of the decay electrons and protons in the PERC (Proton and Electron Radiation Channel) beam station, which provides a strong magnetic field to guide the charged particles in the instrument. Instead of eliminating the guiding field, the R×B spectrometer evolves the field gradually to the analysing field, and the charged particles can be adiabatically transported during the dispersion and detection. The drifts of the particles have similar properties as their dispersion in the normal magnetic spectrometer. Besides, the R×B spectrometer is especially ideal for the measurements of particles with low momenta and large incident angles. We present a design of the R×B spectrometer, which can be used in PERC. For the particles with solid angle smaller than 88 msr, the maximum aberration is below 10(-4). The resolution of the momentum spectra can reach 14.4 keV/c, if the particle position measurements have a resolution of 1 mm. PMID:23576831

Wang, X; Konrad, G; Abele, H

2013-02-11

133

Electroweak Sudakov effects in W, Z and ? production at large transverse momentum  

NASA Astrophysics Data System (ADS)

We study electroweak Sudakov effects in single W, Z and ? production at large transverse momentum using soft collinear effective theory. We present a factorized form of the cross section near the partonic threshold with both QCD and electroweak effects included and compute the electroweak corrections arising at different scales. We analyze their size relative to the QCD corrections as well as the impact of strong-electroweak mixing terms. Numerical results for the vector-boson cross sections at the Large Hadron Collider are presented.

Becher, Thomas; Garcia i Tormo, Xavier

2013-07-01

134

Structural and optical modification in hafnium oxide thin films related to the momentum parameter transferred by ion beam assistance  

Microsoft Academic Search

Hafnium oxide (HfO2) films were deposited on silica and glass substrates by ion (Xe+) assisted deposition with increasing ion momentum transfer to the growing film. The relationship among the ion momentum values, the crystalline phase and the refractive index (packing density) has been worked out by means of X-ray diffraction and spectrophotometric analysis. Compaction of the films by ion beam

M. Alvisi; S. Scaglione; S. Martelli; A. Rizzo; L. Vasanelli

1999-01-01

135

High momentum transfer R{sub T,L} response functions for {sup 3,4}He.  

SciTech Connect

The tantalizing problem of the 'quenching' of the Coulomb sum rule observed in medium weight nuclei is investigated in light nuclei at high momentum transfer. Inclusive electron scattering cross sections for {sup 3,4}He have been measured in the quasielastic region at electron energies between 0.9 GeV and 4.3 GeV, and scattering angles of 15deg and 85deg. Longitudinal (R{sub L}) and transverse (R{sub T}) response functions have been extracted using a Rosenbluth separation at constant vertical strokeq vectorvertical stroke of 1.050 (GeV/c). The ratio of the longitudinal to the transverse reduced response functions in the negative y region reaches unity. The experimental Coulomb sum rule although with large uncertainty and conversly to the case of medium weight nuclei, saturates at high momentum to the He nucleus total charge namely Z=2. (orig.). INDEX TERMS: coulomb excitation; differential cross sections; electron spectra; electrons; experimental data; gev range 01-10;

Filippone, Bradley; Jones Woodward, Cathleen; Potterveld, David; Day, Donal; Beck, Douglas; Boyd, G.; Dodge, Gail; Sick, Ingo; McCarthy, James; Mougey, Jean; Chen, Jian-Ping; Morgenstern, Joseph; Jourdan, Juerg; Giovanetti, Kevin; Kemper, Kirby; Dennis, Lawrence; Smith, Lee; Chinitz, Leigh; Minehart, Ralph; Milner, Richard; Sealock, Richard; Walker, Richard; McKeown, Robert; Thornton, Stephen; Koh, T.; Lorenzon, Wolfgang; Meziani, Zein-Eddine; Meziani, Zein-Eddine

1992-07-01

136

Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector  

NASA Astrophysics Data System (ADS)

It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM ? m and constant equation of state of DE w d suffered from instabilities of the density perturbations on the super-Hubble scales. Here we suggest a new covariant model for the energy-momentum transfer between CDM and DE. Then using the covariant model, we analyze the evolution of density perturbations on the super-Hubble scale. We find that the instabilities can be avoided in the model with constant w d and interaction proportional to ? m . Furthermore, we analyze the dominant non-adiabatic mode in the radiation era and find that the mode grows regularly.

Sun, Cheng-Yi; Song, Yu; Yue, Rui-Hong

2013-02-01

137

Momentum transfer correction for macroscopic-gradient boundary conditions in lattice Boltzmann methods  

NASA Astrophysics Data System (ADS)

The boundary conditions used to represent macroscopic-gradient-related effects in arbitrary geometries with the lattice Boltzmann methods need a trade-off between the complexity of the scheme, due to the loss of localness and the difficulties for directly applying link-based approaches, and the accuracy obtained. A generalization of the momentum transfer boundary condition is presented, in which the arbitrary location of the boundary is addressed with link-wise interpolation (used for Dirichlet conditions) and the macroscopic gradient is taken into account with a finite-difference scheme. This leads to a stable approach for arbitrary geometries that can be used to impose Neumann and Robin boundary conditions. The proposal is validated for stress boundary conditions at walls. Two-dimensional steady and unsteady configurations are used as test case: partial-slip flow between two infinite plates and the slip flow past a circular cylinder.

Izquierdo, Salvador; Fueyo, Norberto

2010-04-01

138

Superelastic electron collisions with silver: Measuring the angular momentum transferred to the target during the collision  

NASA Astrophysics Data System (ADS)

Superelastic electron-collision studies have been carried out with a transition-metal target. 107Ag atoms were excited from the 52S1/2(F=1) ground state to the 52P3/2(F'=2) excited state using continuous-wave circularly polarized laser radiation at ˜328.1 nm. An electron beam of well-defined energy Einc then deexcited the targets, and the superelastically scattered electrons that gained energy from the collision were detected as a function of scattering angle and laser polarization. Results for the angular momentum L? transferred to the target are presented over a range of scattering angles, for six outgoing energies from Eout=100eV down to 20eV.

Jhumka, Sarah; Nixon, Kate L.; Hussey, Martyn; Murray, Andrew James

2013-05-01

139

A covariant formalism for the N* electroproduction at high momentum transfer  

SciTech Connect

A constituent quark model based on the spectator formalism is applied to the gamma N -> N* transition for the three cases, where N* is the nucleon, the Delta and the Roper resonance. The model is covariant, and therefore can be used for the predictions at higher four-momentum transfer squared, Q2. The baryons are described as an off-mass-shell quark and a spectator on-mass-shell diquark systems. The quark electromagnetic current is described by quark form factors, which have a form inspired by the vector meson dominance. The valence quark contributions of the model are calibrated by lattice QCD simulations and experimental data. Contributions of the meson cloud to the inelastic processes are explicitly included.

Gilberto Ramalho,Franz Gross,Maria Haderer De La Pena S,Kazuo Tsushima

2011-05-01

140

Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves  

NASA Astrophysics Data System (ADS)

Momentum matching at hybrid junctions is examined for efficient broadband energy transfer between internal reflection guided waves and evanescence-based plasmonic-gap guided waves. We demonstrate a nanoscale orthogonal junction coupler between 50 nm air-filled plasmonic slot waveguides (PSWs) and 450 nm silicon rib waveguides. Non-resonant junction coupling efficiency of 50 +/- 2 % between 1450 nm and 1650 nm is achieved experimentally and PSW propagation loss is directly measured to be only 2.5 dB/?m. This taperless hybrid junction reduces PSW-based device footprint and enhances device tolerance to temperature and fabrication process variations, serving as a potential platform for hybrid silicon-plasmonic interconnects.

Lin, Charles; Wong, Herman M. K.; Lau, Benedict; Swillam, Mohamed A.; Helmy, Amr S.

2012-09-01

141

Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer  

SciTech Connect

The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. This quantity appears to begin scaling as 1/Q3, a predicted signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

Dalton, Mark; Adams, Gary; Ahmidouch, Abdellah; Angelescu, Tatiana; Arrington, John; Asaturyan, Razmik; Baker, Keith; Benmouna, Nawal; Bertoncini, Crystal; Boeglin, Werner; Bosted, Peter; Breuer, Herbert; Christy, Michael; Connell, S.; Cui, Y.; Danagoulian, Samuel; Day, Donal; Dodario, T.; Dunne, James; Dutta, Dipangkar; Khayari, N.El; Ent, R.; Fenker, Howard; Frolov, Valera; Gan, Liping; Gaskell, David; Hafidi, Kawtar; Hinton, Wendy; Holt, Roy; Horn, Tanja; Huber, Garth; Hungerford, Ed; Jiang, Xiaodong; Jones, Mark; Joo, Kyungseon; Kalantarians, Narbe; Kelly, J.J.; Keppel, Cynthia; Koubarovski, Valeri; Kubarovsky, Valery; Kubarovsky, Valery; Kubarovsky, Valery; Li, Y.; Liang, Y.; Malace, S.; Markowitz, Pete; McKee, Paul; Meekins, David; Mkrtchyan, Hamlet; Moziak, B.; Navasardyan, Tigran; Niculescu, Gabriel; Niculescu, Maria-Ioana; Opper, Allena; Ostapenko, Tanya; Reimer, Paul; Reinhold, Joerg; Roche, Julie; ROCK, S.E.; Schulte, Elaine; Segbefia, Edwin; Smith, C.; Smith, Gregory; Stoler, Paul; Tadevosyan, Vardan; Tang, Liguang; Tvaskis, Vladas; Ungaro, Maurizio; Uzzle, Alicia; Vidakovic, S.; Villano, A.; Vulcan, William; WANG, M.; Warren, Glen; Wesselmann, Frank; Wojtsekhowski, Bogdan; Wood, Stephen; Xu, C.; Yuan, Lulin; Zheng, Xiaochao; Guo Zhu, Hong

2009-01-01

142

Extension of the momentum transfer model to time-dependent pipe turbulence.  

PubMed

We analyze a possible extension of Gioia and Chakraborty's momentum transfer model of friction in steady turbulent pipe flows [Phys. Rev. Lett. 96, 044502 (2006)] to the case of time- and/or space-dependent turbulent flows. The end result is an expression for the stress at the wall as the sum of a steady and a dynamic component. The steady part is obtained by using the instantaneous velocity in the expression for the stress at the wall of a stationary flow. The unsteady part is a weighted average over the history of the flow acceleration, with a weighting function similar to that proposed by Vardy and Brown [J. Sound Vibr. 259, 1011 (2003); J. Sound Vibr. 270, 233 (2004)], but naturally including the effect of spatial derivatives of the mean flow, as in the Brunone model [Brunone et al., J. Water Res. Plan. Manage. 126, 236 (2000)]. PMID:22463315

Calzetta, Esteban

2012-02-07

143

Numerical prediction of heat and momentum transfer over micro-grooved surface with a nonlinear k– ? model  

Microsoft Academic Search

The paper reports numerical results obtained in a fully developed turbulent channel flow with triangular riblets. The heat and momentum transfer characteristics are calculated by using a nonlinear low-Reynolds number k–? model together with several turbulent scalar flux representations. Comparison of the drag variation prediction with previous experimental and numerical data shows that the present turbulence model can simulate the

Moktar Benhalilou; Nobuhide Kasagi

1999-01-01

144

Exact computation and large angular momentum asymptotics of 3nj symbols: Semiclassical disentangling of spin networks  

SciTech Connect

Spin networks, namely, the 3nj symbols of quantum angular momentum theory and their generalizations to groups other than SU(2) and to quantum groups, permeate many areas of pure and applied science. The issues of their computation and characterization for large values of their entries are a challenge for diverse fields, such as spectroscopy and quantum chemistry, molecular and condensed matter physics, quantum computing, and the geometry of space time. Here we record progress both in their efficient calculation and in the study of the large j asymptotics. For the 9j symbol, a prototypical entangled network, we present and extensively check numerically formulas that illustrate the passage to the semiclassical limit, manifesting both the occurrence of disentangling and the discrete-continuum transition.

Anderson, Roger W. [Department of Chemistry, University of California, Santa Cruz, California 95064 (United States); Aquilanti, Vincenzo; Silva Ferreira, Cristiane da [Dipartimento di Chimica, Universita di Perugia, Via Elce di Sotto n.8, I-06123 Perugia (Italy)

2008-10-28

145

Exact computation and large angular momentum asymptotics of 3nj symbols: Semiclassical disentangling of spin networks.  

PubMed

Spin networks, namely, the 3nj symbols of quantum angular momentum theory and their generalizations to groups other than SU(2) and to quantum groups, permeate many areas of pure and applied science. The issues of their computation and characterization for large values of their entries are a challenge for diverse fields, such as spectroscopy and quantum chemistry, molecular and condensed matter physics, quantum computing, and the geometry of space time. Here we record progress both in their efficient calculation and in the study of the large j asymptotics. For the 9j symbol, a prototypical entangled network, we present and extensively check numerically formulas that illustrate the passage to the semiclassical limit, manifesting both the occurrence of disentangling and the discrete-continuum transition. PMID:19045238

Anderson, Roger W; Aquilanti, Vincenzo; da Silva Ferreira, Cristiane

2008-10-28

146

Evaporation residue, fission cross sections, and linear momentum transfer for 14N induced reactions from 35A to 155A MeV  

NASA Astrophysics Data System (ADS)

Differential cross sections for evaporation residues and fission fragments for 35A, 100A, 130A and 155A MeV 14N on targets ranging from 154Sm to 197Au have been measured. The angle-integrated cross sections are larger than what might be expected. The fission fragment-fission fragment folding angle correlations for 35A, 100A MeV 14N and 25A MeV 16O on similar targets were also measured. The average linear momentum transfer has been deduced from both the fission angle correlation and from the fore-aft asymmetry of the fission angular distributions in the laboratory system. The data are all consistent with a picture where pre-equilibrium particle emission removes an increasing fraction of the orbital angular momentum as the bombarding energy increases. This allows a large range of partial waves to contribute to formation of a composite nucleus with a finite fission barrier.

Sonzogni, A. A.; Elmaani, A.; Hyde-Wright, C.; Jiang, W.; Prindle, D.; Vandenbosch, R.; Dinius, J.; Cron, G.; Bowman, D.; Gelbke, C. K.; Hsi, W.; Lynch, W. G.; Montoya, C.; Peaslee, G.; Schwarz, C.; Tsang, M. B.; Williams, C.; Desouza, R.; Fox, D.; Moore, T.

1996-01-01

147

Polarization momentum transfer collision: Faxen-Holtzmark theory and quantum dynamic shielding.  

PubMed

The influence of the quantum dynamic shielding on the polarization momentum transport collision is investigated by using the Faxen-Holtzmark theory in strongly coupled Coulomb systems. The electron-atom polarization momentum transport cross section is derived as a function of the collision energy, de Broglie wavelength, Debye length, thermal energy, and atomic quantum states. It is found that the dynamic shielding enhances the scattering phase shift as well as the polarization momentum transport cross section. The variation of quantum effect on the momentum transport collision due to the change of thermal energy and de Broglie wavelength is also discussed. PMID:23614423

Ki, Dae-Han; Jung, Young-Dae

2013-04-21

148

Polarization momentum transfer collision: Faxen-Holtzmark theory and quantum dynamic shielding  

NASA Astrophysics Data System (ADS)

The influence of the quantum dynamic shielding on the polarization momentum transport collision is investigated by using the Faxen-Holtzmark theory in strongly coupled Coulomb systems. The electron-atom polarization momentum transport cross section is derived as a function of the collision energy, de Broglie wavelength, Debye length, thermal energy, and atomic quantum states. It is found that the dynamic shielding enhances the scattering phase shift as well as the polarization momentum transport cross section. The variation of quantum effect on the momentum transport collision due to the change of thermal energy and de Broglie wavelength is also discussed.

Ki, Dae-Han; Jung, Young-Dae

2013-04-01

149

Estimation of the ion toroidal rotation source due to momentum transfer from Lower Hybrid waves in Alcator C-Mod  

SciTech Connect

Significant ion toroidal rotation (50km/s) has been measured by X-Ray spectroscopy for impurities in Alcator C-Mod during lower hybrid (LH) RF power injection. We investigate the relation between the computed toroidal momentum input from LH waves and the measured INITIAL change of ion toroidal rotation when the LH power is turned on. The relation may depend on the plasma current and magnetic configuration. Because of the fast build up time of the electron quasilinear plateau (<1 millisecond), the electron distribution function rapidly reaches steady state in which the electrons transfer momentum to the ions. The LH wave momentum input is computed from the self consistent steady state electron distribution function and a bounce-averaged quasilinear diffusion coefficient that are obtained by iterating a full wave code (TORLH) with a Fokker Plank code (CQL3D)

Lee, J. P.; Wright, J. C.; Bonoli, P. T.; Parker, R. R.; Catto, P. J.; Podpaly, Y. A.; Rice, J. E.; Reinke, M. L. [Plasma Science and Fusion Center, MIT, Cambridge (United States)

2011-12-23

150

Inter-species momentum transfer due to the two-stream instability in the solar wind-Venus ionosphere interaction  

NASA Astrophysics Data System (ADS)

We study the development of the two-stream plasma instability, and the ensuing momentum transfer between species, in a four component plasma. The system is taken to represent the interaction of heavy ions and electrons of planetary origin, assumed to be initially at rest, and a stream of protons and electrons representing the solar wind. A stability criterion in terms of solar wind and ionospheric plasma parameters, namely density and temperature as well as the solar wind streaming velocity, is derived from a linear analysis of the coupled fluid equations of motion for all species. The nonlinear development of the instability is studied using a particle plasma code developed by our group. A heuristic estimation of momentum transfer between species is compared with the value derived from the acceleration of the planetary ions resulting in our numerical simulations.

Aceves, H.; Reyes-Ruiz, M.; Trejo, D. M.; Perez De Tejada, H. A.

2011-12-01

151

Inner-shell electron energy loss spectroscopy and generalized oscillator strengths at high momentum transfer  

NASA Astrophysics Data System (ADS)

Detailed information about the energies of the electronically excited and ionized states of atoms and molecules is of central importance to the understanding of the interaction of energetic radiation with matter. Such data permits a more complete understanding of various processes taking place in physics, chemistry or biology, with important areas of application including electron and X-ray microscopy, space physics and chemistry or any other area where energetic radiation is used. This work documents the improvements and performance of a variable scattering angle energy loss spectrometer used to investigate inner-shell electronic spectroscopy of gases and to map generalized oscillator strengths. Wide ranges of impact energy and scattering angle are used to study both electric dipole and non-dipole transitions. New spectroscopic studies include: (i) the observation of the non-dipole "B-state" in SF6 S 2 p edge at very high scattering angle (62°) and at 1550 eV impact energy, where it dominates the spectrum; (ii) the first experimental observation of the C 1s ? sigmag* transition in CO2. Generalized Oscillator Strength (GOS) profiles were mapped systematically for a collection of molecules: in SF6, the GOS for S 2p and S 2s were extended up to very high momentum transfer, while the GOS for F 1s was mapped here for the first time. GOS curves were also obtained for all edges in CO 2, COS and CS2, some of them revealing their shapes for the first time. Where available, the results were compared to theoretical calculations. This work greatly extends previous reported studies of GOS for inner-shell excitation.

Eustatiu, Iulia Gabriela

152

Angular momentum transfer in deep-inelastic reactions as inferred from angular distributions of sequential-fission fragments  

Microsoft Academic Search

Theoretical results of a model of heavy-ion collisions in terms of elementary modes of excitation are presented for the reaction Kr+Pb at 610 MeV with special emphasis on the transfer of angular momentum. The angular distributions of the fragments resulting from the sequential fission of the heavy reaction partner are calculated in a semiclassical model. Conflicting experimental results reported for

R. A. Broglia; G. Pollarolo; C. H. Dasso; T. Dossing

1979-01-01

153

Filtered gas–solid momentum transfer models and their application to 3D steady-state riser simulations  

Microsoft Academic Search

To account for meso-scale phenomena in coarse grid simulations, correlation terms appearing in the filtered gas–solid flow equations have to be modeled. Possible approaches to describe filtered gas–solid momentum transfer are evaluated via a mixture speed of sound test. In contrast to the effective drag coefficient closure model for the filtered drag force, the generalized added mass closure model for

Juray De Wilde; Geraldine J. Heynderickx; Guy B. Marin

2007-01-01

154

Study of the Momentum Transfer to Target-Like Residues in Heavy Ion Reactions by Prompt Gamma Measurements  

Microsoft Academic Search

Doppler shift and Doppler broadening of prompt gamma lines have been measured for many reaction residues in the interaction of 12C with 63Cu at 33 A MeV incident 12C energy using the AFRODITE detector array at NAC, Faure, Cape Town. A preliminary analysis of these data, which carry information of the momentum transferred in the reaction, shows that very useful

K. A. Korir; S. H. Connell; J. P. F. Sellschop; E. Sideras-Haddad; S. V. Förtsch; J. J. Lawrie; R. T. Newman; G. K. Mabala; F. D. Smit; G. F. Steyn; R. Bassini; C. Birattari; M. Cavinato; E. Fabrici; E. Gadioli; E. Gadioli Erba; Z. Vilakazi; B. Becker

2001-01-01

155

Study of mass and momentum transfer and their effect on the direct fluorination of uranium oxide  

SciTech Connect

The mechanism for the fluorination of solid U/sub 3/O/sub 8/ to gaseous UF/sub 6/ was found to be a two-step process with solid UO/sub 2/F/sub 2/ as an intermediate. The highest particle temperatures were found to be associated with the initial reaction step to UO/sub 2/F/sub 2/; it was recommended that these temperatures be maintained below 1700/sup 0/F. The chemical equilibrium constant for the fluorination of PuF/sub 4/ to PuF/sub 6/ was found to be unexpectedly low at typical flame tower temperatures. Although not confirmed, there is an indication in the literature that a similar equilibrium constant is associated with the fluorination of NpF/sub 4/ and other transuranic molecules. It was recommended that uranium oxides which are significantly contaminated with transuranics should not be processed through a direct fluorination reactor such as the UF/sub 6/ flame tower. Reaction rate equations were developed for the fluorination of U/sub 3/O/sub 8/, UF/sub 4/, PuF/sub 4/ and NpF/sub 4/. During the course of the development, a significant discrepancy was found in the literature for the activation energy of the fluorination of U/sub 3/O/sub 8/. Equations were developed for both a high and low limit rate constant for the fluorination of U/sub 3/O/sub 8/. A variey of momentum, heat and mass transfer equations were developed for both oxide particles and the gas phase within the flame tower. Equations were developed to estimate the physical and transport properties of each gaseous component and the gas mixture as a whole. These properties and the transport equations were used to estimate the reaction time and distance for oxide particles with both the low and high limit reaction rate constant. The procedures used to perform these calculations is limited to constant temperature and an oxide feed comprised of a single particle size. The results indicate that above 1000/sup 0/F the mass transfer of reactants and products becomes increasingly important to the overall rate of the reaction.

Cross, P.E.

1983-02-25

156

Tomographic imaging of coherent x-ray scatter momentum transfer distribution using spectral x-ray detection and polycapillary optic  

NASA Astrophysics Data System (ADS)

Quantitation of coherent x-ray scatter traditionally involves measuring the intensity of the scattered x-ray over a range of angles (?) from the illuminating monochromatic x-ray beam. Spectral x-ray imaging produces the same information at a single ? when bremsstrahlung x-ray exposure is used. We used a 200?m thick sheet-illumination of a phantom (lucite cylinder containing holes with water, polyethylene, collagen, polycarbonate, and nylon) and a polycapillary x-ray optic collimator to provide measurements at a fixed ?. A Medipix2 x-ray detection array (2562 (55?m)2 pixels) provided the spectral (E, 10 - 22 keV in 3keV energy bins) spread needed to generate the momentum transfer (q) profile information at one angle. The tungsten x-ray source anode (aluminum filter) was operated at 35kVp at 20mA. The detected scatter intensity was corrected for attenuation of the incident and the scattered x-ray by use of the regular CT image of the phantom generated at the same energy bins. The phantom was translated normal to the plane of the fan beam in 65, 0.2mm, steps to generate the 3D image data. The momentum transfer profiles generated with this approach were compared to published momentum transfer profiles obtained by other methods.

Eaker, Diane R.; Jorgensen, Steven M.; Butler, Anthony P. H.; Ritman, Erik L.

2010-08-01

157

Triply differential (e,2e) cross sections for ionization of the nitrogen molecule at large energy transfer  

NASA Astrophysics Data System (ADS)

Measurements of the (e,2e) triply differential cross sections (TDCS) are presented for the ionization of the nitrogen molecule in coplanar asymmetric geometry at an incident energy of about 600 eV and a large energy transfer to the target. The experimental results are compared with state-of-the-art available theoretical models for treating differential electron impact ionization of molecules. The experimental TDCS are characterized by a shift towards larger angles of the angular distribution with respect to the momentum transfer direction, and by a large intensity in the recoil region, especially for ionization of the 'inner' 2?g molecular orbital. Such shifts and intensity enhancement are not predicted by the model calculations which rather yield a TDCS symmetrically distributed around the momentum transfer direction.

Naja, A.; Staicu-Casagrande, E. M.; Lahmam-Bennani, A.; Nekkab, M.; Mezdari, F.; Joulakian, B.; Chuluunbaatar, O.; Madison, D. H.

2007-09-01

158

The drag reduction in laminar and turbulent boundary layers by prepared surfaces with reduced momentum transfer  

Microsoft Academic Search

Similarity solutions for laminar boundary layer tangential momentum accomodation coefficient (TAC) slip flow are presented showing that the efficiency of a given slip coefficient is pressure-gradient dependent. Turbulent boundary layer flow is calculated applying an integral method. Slip produces a sort of laminarization. It is confirmed that a given TAC-value in turbulent flow corresponds to a Kn number about one

B. Gampert; K. Homann; H. B. Rieke

1980-01-01

159

Plasma momentum coupling  

Microsoft Academic Search

Momentum transfer between a high velocity aluminum plasma (2 x 10 to the 7th power cm\\/sec) and a stationary magnetized air plasma is experimentally investigated to determine if any collisionless processes are operating at high Alfven Mach number. The aluminum plasma expands within a cone (1\\/20 steradium) into the large volume of air plasma with the variable applied magnetic field

T. L. Cronburg; D. A. Reilly

1975-01-01

160

Measurements of the Proton Elastic-Form-Factor Ratio ?pGEp/GMp at Low Momentum Transfer  

NASA Astrophysics Data System (ADS)

High-precision measurements of the proton elastic form-factor ratio, ?pGEp/GMp, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to GEp being smaller than expected.

Ron, G.; Glister, J.; Lee, B.; Allada, K.; Armstrong, W.; Arrington, J.; Beck, A.; Benmokhtar, F.; Berman, B. L.; Boeglin, W.; Brash, E.; Camsonne, A.; Calarco, J.; Chen, J. P.; Choi, Seonho; Chudakov, E.; Coman, L.; Craver, B.; Cusanno, F.; Dumas, J.; Dutta, C.; Feuerbach, R.; Freyberger, A.; Frullani, S.; Garibaldi, F.; Gilman, R.; Hansen, O.; Higinbotham, D. W.; Holmstrom, T.; Hyde, C. E.; Ibrahim, H.; Ilieva, Y.; de Jager, C. W.; Jiang, X.; Jones, M. K.; Kang, H.; Kelleher, A.; Khrosinkova, E.; Kuchina, E.; Kumbartzki, G.; Lerose, J. J.; Lindgren, R.; Markowitz, P.; May-Tal Beck, S.; McCullough, E.; Meekins, D.; Meziane, M.; Meziani, Z.-E.; Michaels, R.; Moffit, B.; Norum, B. E.; Oh, Y.; Olson, M.; Paolone, M.; Paschke, K.; Perdrisat, C. F.; Piasetzky, E.; Potokar, M.; Pomatsalyuk, R.; Pomerantz, I.; Puckett, A.; Punjabi, V.; Qian, X.; Qiang, Y.; Ransome, R.; Reyhan, M.; Roche, J.; Rousseau, Y.; Saha, A.; Sarty, A. J.; Sawatzky, B.; Schulte, E.; Shabestari, M.; Shahinyan, A.; Shneor, R.; Širca, S.; Slifer, K.; Solvignon, P.; Song, J.; Sparks, R.; Subedi, R.; Strauch, S.; Urciuoli, G. M.; Wang, K.; Wojtsekhowski, B.; Yan, X.; Yao, H.; Zhan, X.; Zhu, X.

2007-11-01

161

The Proton Elastic Form Factor Ratio mu(p) G**p(E)/G**p(M) at Low Momentum Transfer  

SciTech Connect

High precision measurements of the proton elastic form factor ratio have been made at four-momentum transfers, Q^2, between 0.2 and 0.5 GeV^2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q^2 range the deviation from unity is primarily due to GEp being smaller than the dipole parameterization.

G. Ron; J. Glister; B. Lee; K. Allada; W. Armstrong; J. Arrington; A. Beck; F. Benmokhtar; B.L. Berman; W. Boeglin; E. Brash; A. Camsonne; J. Calarco; J. P. Chen; Seonho Choi; E. Chudakov; L. Coman; B. Craver; F. Cusanno; J. Dumas; C. Dutta; R. Feuerbach; A. Freyberger; S. Frullani; F. Garibaldi; R. Gilman; O. Hansen; D. W. Higinbotham; T. Holmstrom; C.E. Hyde; H. Ibrahim; Y. Ilieva; C. W. de Jager; X. Jiang; M. K. Jones; A. Kelleher; E. Khrosinkova; E. Kuchina; G. Kumbartzki; J. J. LeRose; R. Lindgren; P. Markowitz; S. May-Tal Beck; E. McCullough; D. Meekins; M. Meziane; Z.-E. Meziani; R. Michaels; B. Moffit; B.E. Norum; Y. Oh; M. Olson; M. Paolone; K. Paschke; C. F. Perdrisat; E. Piasetzky; M. Potokar; R. Pomatsalyuk; I. Pomerantz; A. Puckett; V. Punjabi; X. Qian; Y. Qiang; R. Ransome; M. Reyhan; J. Roche; Y. Rousseau; A. Saha; A.J. Sarty; B. Sawatzky; E. Schulte; M. Shabestari; A. Shahinyan; R. Shneor; S. ? Sirca; K. Slifer; P. Solvignon; J. Song; R. Sparks; R. Subedi; S. Strauch; G. M. Urciuoli; K. Wang; B. Wojtsekhowski; X. Yan; H. Yao; X. Zhan; X. Zhu

2007-11-01

162

Coherent spin-transfer dynamics in diluted magnetic semiconductor quantum wells even after optical excitation with zero net angular momentum  

NASA Astrophysics Data System (ADS)

A quantum kinetic study of correlated spin transfer between optically excited electrons and Mn atoms in a ZnMnSe quantum well is presented. The simulations predict genuine signatures of non-Markovian spin dynamics which are particularly pronounced for special two-color laser excitations with a zero net angular momentum where a Markovian theory predicts an almost zero total electron spin for all times. In contrast, in the quantum kinetic simulations a sizable total electron spin builds up. Subsequently, a coherent oscillatory exchange of spin between the electron and Mn subsystems is observed.

Thurn, C.; Cygorek, M.; Axt, V. M.; Kuhn, T.

2013-10-01

163

Charge and momentum transfer in supercooled melts: why should their relaxation times differ?  

PubMed

The steady-state values of the viscosity and the intrinsic ionic conductivity of quenched melts are computed, in terms of independently measurable quantities. The frequency dependence of the ac dielectric response is estimated. The discrepancy between the corresponding characteristic relaxation times is only apparent; it does not imply distinct mechanisms, but stems from the intrinsic barrier distribution for alpha-relaxation in supercooled fluids and glasses. This type of intrinsic "decoupling" is argued not to exceed four orders in magnitude for known glassformers. The origin of the discrepancy between the stretching exponent beta, as extracted from epsilon(omega) and the dielectric modulus data, is explained. The actual width of the barrier distribution always grows with lowering the temperature. The contrary is an artifact of the large contribution of the dc-conductivity component to the modulus data. The methodology allows one to single out other contributions to the conductivity, as in "superionic" liquids or when charge carriers are delocalized, implying that in those systems, charge transfer does not require structural reconfiguration. PMID:17492870

Lubchenko, Vassiliy

2007-05-01

164

Momentum and Heat Transfer in Power-Law Fluids Across a Rotating Cylinder: A Numerical Study  

NASA Astrophysics Data System (ADS)

The momentum and energy equations describing the steady cross-flow of power-law fluids past a rotating heated cylinder have been solved numerically. The results highlight the influence of dimensionless rotational velocity (0<=?<=6), power-law index (0.5<=n<=1.5), Prandtl number (1<=Pr<=100) on the drag and lift coefficients for Reynolds number of Re = 40, surface-averaged values of the Nusselt number, detailed flow and temperature fields.

Soares, A. A.; Couto, Nuno T.; Marinho, D.; Rouboa, Abel; Mantha, Vishveshwar; Silva, A.

2011-09-01

165

On the Transfer of Momentum by Trapped Lee Waves: Case of the IOP 3 of PYREX.  

NASA Astrophysics Data System (ADS)

The airplane data collected between 4 and 12 km above the Pyrénées during the intensive observation period (IOP) 3 of the Pyrénées Experiment (PYREX) are analyzed again. A spectral analysis of the velocity and potential temperature series shows that the mountain waves are dominated by two oscillations with well-defined horizontal wavenumbers. At nearly all altitudes, at least one among these two oscillations can be extracted: the short oscillation dominates the signal below 6 km and the long one above. These two oscillations contribute to the Reynolds stress below 5 km and not above.Linear steady nondissipative simulations show that the short oscillation is a trapped resonant mode and the long one a leaking, or partially leaking, resonant mode of the background flow. Pseudo-momentum flux budgets show that the short resonant mode only contributes to the Reynolds stress at low level (here below 3 to 4 km typically) while the long one contributes to the Reynolds stress at all levels. At low level, (below 4 to 6 km typically), the long mode can induce a decay of the Reynolds stress amplitude, when it partially leaks toward the stratosphere. Various tests, changing the incident flow profiles within limits provided by the different soundings available this day, reveal, on the one hand, that the above findings are quite robust. On the other hand, they reveal that the resonant modes response is very sensitive to the background flow and orography specifications.In some of the steady linear simulations, the long resonant oscillation has a Reynolds stress that is constant with altitude. In all of them the downwind extent of the lee waves is overestimated and the waves amplitude is too large. To explain these mismatches with the observations, we present simulations that last 3 h only, so the resonant modes patterns are everywhere unsteady. They show that during their build-up phase, all the leaking modes can make the Reynolds stress amplitude decays with altitude at low level (here below 4 to 6 km, typically). At this time, the downstream extent of the waves is also correctly predicted. These linear unsteady simulations also give realistic waves amplitude and Reynolds stress profiles if the mountain is cut off to parameterize nonlinear low-level flow splitting.By using a nonlinear model, the simulated waves are matched to that observed through an adjustment of the parameters of the turbulent diffusion parameterization scheme: with enough dissipation, the model response can become quite realistic. In these nonlinear simulations, the background flow is chosen so that there is only one resonant mode and this mode does not contribute much to the Reynolds stress in the inviscid case. When increasing the mountain height and the dissipation, the overall structure of that mode stays unchanged, and it never contributes much to the Reynolds stress. This indicates that the dissipative and nonlinear processes alone are not likely to produce the observed low-level stress variations associated with the resonant modes.


Georgelin, Marc; Lott, François

2001-12-01

166

The effect of the momentum transfer on the sensitivity of a photon scattering method for the characterization of tissues.  

PubMed

The ratio of coherent to Compton photon scattered by a tissue-like material depends on its effective atomic number. This ratio can, therefore, be used for the in vivo characterization of tissues. The intrinsic sensitivity of this measurement is defined as the change in the coherent-to-Compton ratio for a given change in the atomic number. The effect of the scatter angle on the sensitivity has already been described by us in a paper recently submitted to this journal. In this study, the dependence of the sensitivity on the energy of the incident photons is investigated in two ways. The first approach is quasitheoretical and is based on computations of the cross sections of the coherent and Compton scattering for various energies. The second approach is experimental and it involves the measurement of the scatter ratio from a series of K2HPO4 solutions for three primary photon energies: 60, 81, and 140 keV. The combined effect of both the photon energy and the scatter angle on the sensitivity can be described by a single parameter which is the momentum transfer. It is concluded that for the limited range of the atomic numbers which apply to trabecular bone (8 less than or equal to Z less than or equal to 11) the momentum transfer reflects completely the effect of the scatter angle and photon energy on the sensitivity. PMID:6700551

Leichter, I; Karellas, A; Craven, J D; Greenfield, M A

167

Radial Angular Momentum Transfer and Magnetic Barrier for Short-type Gamma-Ray-burst Central Engine Activity  

NASA Astrophysics Data System (ADS)

Soft extended emission (EE) following initial hard spikes up to 100 s was observed with Swift/BAT for about half of known short-type gamma-ray bursts (SGRBs). This challenges the conversional central engine models of SGRBs, i.e., compact star merger models. In the framework of black-hole-neutron-star merger models, we study the roles of radial angular momentum transfer in the disk and the magnetic barrier around the black hole in the activity of SGRB central engines. We show that radial angular momentum transfer may significantly prolong the lifetime of the accretion process, which may be divided into multiple episodes by the magnetic barrier. Our numerical calculations based on models of neutrino-dominated accretion flows suggest that disk mass is critical for producing the observed EE. In the case of the mass being ~0.8 M ?, our model can reproduce the observed timescale and luminosity of both the main and the EE episodes in a reasonable parameter set. The predicted luminosity of the EE component is lower than the observed EE within about one order of magnitude and the timescale is shorter than 20 s if the disk mass is ~0.2 M ?. Swift/BAT-like instruments may be not sensitive enough to detect the EE component in this case. We argue that the EE component could be a probe for the merger process and disk formation for compact star mergers.

Liu, Tong; Liang, En-Wei; Gu, Wei-Min; Hou, Shu-Jin; Lei, Wei-Hua; Lin, Lin; Dai, Zi-Gao; Zhang, Shuang-Nan

2012-11-01

168

RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY  

SciTech Connect

Soft extended emission (EE) following initial hard spikes up to 100 s was observed with Swift/BAT for about half of known short-type gamma-ray bursts (SGRBs). This challenges the conversional central engine models of SGRBs, i.e., compact star merger models. In the framework of black-hole-neutron-star merger models, we study the roles of radial angular momentum transfer in the disk and the magnetic barrier around the black hole in the activity of SGRB central engines. We show that radial angular momentum transfer may significantly prolong the lifetime of the accretion process, which may be divided into multiple episodes by the magnetic barrier. Our numerical calculations based on models of neutrino-dominated accretion flows suggest that disk mass is critical for producing the observed EE. In the case of the mass being {approx}0.8 M {sub Sun }, our model can reproduce the observed timescale and luminosity of both the main and the EE episodes in a reasonable parameter set. The predicted luminosity of the EE component is lower than the observed EE within about one order of magnitude and the timescale is shorter than 20 s if the disk mass is {approx}0.2 M {sub Sun }. Swift/BAT-like instruments may be not sensitive enough to detect the EE component in this case. We argue that the EE component could be a probe for the merger process and disk formation for compact star mergers.

Liu Tong; Gu Weimin; Hou Shujin [Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005 (China); Liang Enwei [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning, Guangxi 530004 (China); Lei Weihua [School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China); Lin Lin; Zhang Shuangnan [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Dai Zigao, E-mail: lew@gxu.edu.cn [Department of Astronomy, Nanjing University, Nanjing, Jiangsu 210093 (China)

2012-11-20

169

Frame dependence of {sup 3}He transverse (e,e{sup '}) response functions at intermediate momentum transfers  

SciTech Connect

The transverse electron scattering response function of {sup 3}He was recently studied by us in the quasielastic peak region for momentum transfers q between 500 and 700 MeV/c. Those results, obtained using the active nucleon Breit (ANB) frame, are here supplemented by calculations in the laboratory, Breit, and ANB frames using the two-fragment model discussed in our earlier work on the frame dependence of the longitudinal response function R{sub L}(q,{omega}). We find relatively frame-independent results and good agreement with experiment especially for the lower momentum transfers. This agreement occurs when we neglect an {omega}-dependent piece of the one-body current relativistic correction. Inclusion of this term leads, however, to a rather pronounced frame dependence at q=700 MeV/c. A discussion of this term is given here. This report also includes a correction to our previous ANB results for R{sub T}(q,{omega}).

Efros, Victor D. [Russian Research Centre 'Kurchatov Institute', 123182 Moscow (Russian Federation); Leidemann, Winfried; Orlandini, Giuseppina [Dipartimento di Fisica, Universita di Trento, I-38123 Trento (Italy); Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, I-38123 Trento (Italy); Tomusiak, Edward L. [Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, V8P 1A1 (Canada)

2011-05-15

170

Directed Transfer of Large DNA Fragments between Streptomyces Species  

Microsoft Academic Search

The biosynthesis of complex natural products in bacteria is invariably encoded within large gene clusters. Although this facilitates the cloning of such gene clusters, their heterologous expression in genetically ame- nable hosts remains a challenging problem, principally due to the difficulties associated with manipulating large DNA fragments. Here we describe a new method for the directed transfer of a gene

ZHIHAO HU; DAVID A. HOPWOOD; CHAITAN KHOSLA

2000-01-01

171

Heat and momentum transfer for compact louvered fin-and-tube heat exchangers in wet conditions  

Microsoft Academic Search

The air side performances of two louvered fin surfaces under dehumidifying conditions were examined in this study. The test results indicated that the effect of fin pitch on the heat transfer performance is comparatively small, and the friction factors increase significantly with fin pitch for fully wet conditions. The effect of inlet relative humidity on the sensible heat transfer performance

Chi-Chuan Wang; Yur-Tsai Lin; Chi-Juan Lee

2000-01-01

172

Generation of High-Energy Photons with Large Orbital Angular Momentum by Compton Backscattering  

SciTech Connect

Usually, photons are described by plane waves with a definite 4-momentum. In addition to plane-wave photons, ''twisted photons'' have recently entered the field of modern laser optics; these are coherent superpositions of plane waves with a defined projection ({h_bar}/2{pi})m of the orbital angular momentum onto the propagation axis, where m is an integer. In this Letter, we show that it is possible to produce high-energy twisted photons by Compton backscattering of twisted laser photons off ultrarelativistic electrons. Such photons may be of interest for experiments related to the excitation and disintegration of atoms and nuclei, and for studying the photoeffect and pair production off nuclei in previously unexplored experimental regimes.

Jentschura, U. D. [Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409 (United States); Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany); Serbo, V. G. [Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany); Novosibirsk State University, Pirogova 2, 630090, Novosibirsk (Russian Federation)

2011-01-07

173

Oliver E. Buckley Condensed Matter Prize Lecture: Transfer of spin momentum between magnets: its genesis and prospect  

NASA Astrophysics Data System (ADS)

Consider two nanoscopic monodomain magnets connected by a spacer that is composed of a non-magnetic metal or a tunnel barrier. Any externally applied electric current flowing through these three layers contributes tiny pseudo-torques to both magnetic moments (J. S. 1989). Such a weak spin-transfer torque (STT) may counteract and overcome a comparably small torque caused by viscous dissipation (L. Berger 1996; J. S. 1996). Any initial motion (e. g. excited by ambient temperature) of one moment (or both), may grow in amplitude and culminate in steady precession or a transient switch to a new direction of static equilibrium. In a memory element, the STT effect writes 0 or 1 in a magnetic-tunnel junction. Indeed, world-wide developments of memory arrays and radio-frequency oscillators utilizing current-driven STT today enjoy a nine-digit dollar commitment. But the fact that transfer of each half-unit of spin momentum h/4? through a barrier requires the transfer of at least one unit of electric charge limits its efficiency. Arguably, STT should also arise from the flow of external heat, in either direction, between an insulating magnet, of ferrite or garnet (e. g. YIG) composition, and a metallic spacer (J. S. 2010). Whenever s-d exchange annihilates a hot magnon at the insulator/metal-spacer interface, it transfers one unit h/2? of spin momentum to the spacer. Conduction electrons within the spacer will transport this spin momentum to the second magnet without requiring an electric current. Such a thermagnonic method, modestly powered by a Joule-effect heater, can substantially increase the efficiency of STT. Support for this prediction comes from (1) an estimate of the sd-exchange coefficient from data on spin relaxation in magnetically dilute (Cu,Ag,Au):Mn alloys; (2) a DFT computation (J. Xiao et al 2010); and (3) most persuasively, data from spin pumping driven across a YIG/Au interface by ferromagnetic resonance (B. Heinrich et al 2011; C. Burrowes et al 2012).

Slonczewski, John

2013-03-01

174

Effect of pulse duration and polarization on momentum and energy transfer to laser-irradiated targets  

SciTech Connect

Polished aluminum targets were irradiated with 1.06-..mu..m laser pulses of 60-psec and 2.5-nsec duration and of ..pi.. and sigma polarization. The peak focused intensity was varied over the range 10/sup 14/-10/sup 16/W/cm/sup 2/. Clear evidence of resonant absorption for 60-psec pulses was obtained from target momentum measurements made with a torsion pendulum. No resonant absorption effects dependent on light polarization or angle of incidence were detected for long-pulse irradiations.

Arad, B.; Eliezer, S.; Jackel, S.; Krumbein, A.; Loebenstein, H.M.; Salzmann, D.; Zigler, A.; Zmora, H.; Zweigenbaum, S.

1980-02-04

175

Generation of structured beams in large-Fresnel number degenerate cavities and beam transformation with orbital angular momentum  

NASA Astrophysics Data System (ADS)

We employ a large-Fresnel-number laser system to demonstrate the three-dimensional optical coherent waves localized on Lissajous and trochoidal parametric surfaces with Lissajous and trochoidal transverse patterns in degenerate cavities. The coherent structured beams are verified to be composed of degenerate Hermite-Gaussian and Laguerre-Gaussian modes with different longitudinal indices resulted from longitudinal-transverse coupling. As well known, the Hermite- Gaussian modes can be converted into Laguerre-Gaussian modes possessing orbital angular momentum by use of a pair of cylindrical lens. Consequently, we make use of cylindrical lenses to transform the Lissajous structured beams superposed of degenerate Hermite-Gaussian modes into the intriguing trochoidal structured beam possessing optical orbital angular momentum.

Lu, T. H.; Lin, Y. C.; Chen, Y. F.; Huang, K. F.

2010-02-01

176

Evaporation residue, fission cross sections, and linear momentum transfer for {sup 14}N induced reactions from 35{ital A} to 155{ital A} MeV  

SciTech Connect

Differential cross sections for evaporation residues and fission fragments for 35{ital A}, 100{ital A}, 130{ital A} and 155{ital A} MeV {sup 14}N on targets ranging from {sup 154}Sm to {sup 197}Au have been measured. The angle-integrated cross sections are larger than what might be expected. The fission fragment-fission fragment folding angle correlations for 35{ital A}, 100{ital A} MeV {sup 14}N and 25{ital A} MeV {sup 16}O on similar targets were also measured. The average linear momentum transfer has been deduced from both the fission angle correlation and from the fore-aft asymmetry of the fission angular distributions in the laboratory system. The data are all consistent with a picture where pre-equilibrium particle emission removes an increasing fraction of the orbital angular momentum as the bombarding energy increases. This allows a large range of partial waves to contribute to formation of a composite nucleus with a finite fission barrier. {copyright} {ital 1996 The American Physical Society.}

Sonzogni, A.A.; Elmaani, A.; Hyde-Wright, C.; Jiang, W.; Prindle, D.; Vandenbosch, R. [Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195 (United States); Dinius, J.; Cron, G.; Bowman, D.; Gelbke, C.K.; Hsi, W.; Lynch, W.G.; Montoya, C.; Peaslee, G.; Schwarz, C.; Tsang, M.B.; Williams, C. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); DeSouza, R.; Fox, D.; Moore, T. [Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (United States)

1996-01-01

177

On-demand Overlay Networks for Large Scientific Data Transfers  

SciTech Connect

Large scale scientific data transfers are central to scientific processes. Data from large experimental facilities have to be moved to local institutions for analysis or often data needs to be moved between local clusters and large supercomputing centers. In this paper, we propose and evaluate a network overlay architecture to enable highthroughput, on-demand, coordinated data transfers over wide-area networks. Our work leverages Phoebus and On-demand Secure Circuits and AdvanceReservation System (OSCARS) to provide high performance wide-area network connections. OSCARS enables dynamic provisioning of network paths with guaranteed bandwidth and Phoebus enables the coordination and effective utilization of the OSCARS network paths. Our evaluation shows that this approach leads to improved end-to-end data transfer throughput with minimal overheads. The achievedthroughput using our overlay was limited only by the ability of the end hosts to sink the data.

Ramakrishnan, Lavanya; Guok, Chin; Jackson, Keith; Kissel, Ezra; Swany, D. Martin; Agarwal, Deborah

2009-10-12

178

Electroproduction of {eta} mesons in the S{sub 11}(1535) resonance region at high momentum transfer  

SciTech Connect

The differential cross section for the process p(e,e{sup '}p){eta} has been measured at Q{sup 2}{approx}5.7 and 7.0(GeV/c){sup 2} for center-of-mass energies from threshold to 1.8 GeV, encompassing the S{sub 11}(1535) resonance, which dominates the channel. This is the highest momentum-transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A{sub 1/2}, for the production of the S{sub 11}(1535) resonance, is extracted from the data. Within the limited Q{sup 2} now measured, this quantity appears to begin scaling as Q{sup -3}--a predicted, but not definitive, signal of the dominance of perturbative QCD at Q{sup 2}{approx}5 (GeV/c){sup 2}.

Dalton, M. M. [University of the Witwatersrand, Johannesburg (South Africa); Adams, G. S.; Moziak, B.; Stoler, P.; Villano, A. [Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Ahmidouch, A.; Danagoulian, S. [North Carolina A and T State University, Greensboro, North Carolina 27411 (United States); Angelescu, T.; Malace, S. [Bucharest University, Bucharest (Romania); Arrington, J.; Hafidi, K.; Holt, R. J.; Reimer, P. E.; Schulte, E.; Zheng, X. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Asaturyan, R.; Mkrtchyan, H.; Navasardyan, T.; Tadevosyan, V. [Yerevan Physics Institute, Yerevan (Armenia); Baker, O. K. [Hampton University, Hampton, Virginia 23668 (United States); Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)] (and others)

2009-07-15

179

Electroproduction of {eta} mesons in the S{sub 11} (1535) resonance region at high momentum transfer.  

SciTech Connect

The differential cross section for the process p(e,e{prime}p) {eta} has been measured at Q{sup 2} {approx} 5.7 and 7.0(GeV/c){sup 2} for center-of-mass energies from threshold to 1.8 GeV, encompassing the S{sub 11}(1535) resonance, which dominates the channel. This is the highest momentum-transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A{sub 1/2}, for the production of the S{sub 11}(1535) resonance, is extracted from the data. Within the limited Q{sup 2} now measured, this quantity appears to begin scaling as Q{sup -3} - a predicted, but not definitive, signal of the dominance of perturbative QCD at Q{sup 2} {approx} 5 (GeV/c){sup 2}.

Dalton, M. M.; Adams, G. S.; Ahmidouch, A.; Angelescu, T.; Arrington, J.; Holt, R. J.; Hafidi, K.; Reimer, P.; Schulte, E.; Zheng, X.; Physics; Univ. of Witwatersrand; Rensselaer Polytechnic Inst.; North Carolina A & T State Univ.; Bucharest Univ.; Yerevan Physics Inst.

2009-07-01

180

Meson-exchange currents and final-state interactions in quasielastic electron scattering at high momentum transfers  

SciTech Connect

The effects of meson-exchange currents (MEC) are computed for the one-particle one-hole transverse response function for finite nuclei at high momentum transfers q in the region of the quasi-elastic peak. A semirelativistic shell model is used for the one-particle-emission (e,e{sup '}) reaction. Relativistic effects are included using relativistic kinematics, performing a semirelativistic expansion of the current operators, and using the Dirac-equation-based (DEB) form of the relativistic mean-field potential for the final states. It is found that final-state interactions (FSI) produce an important enhancement of the MEC in the high-energy tail of the response function for q>=1 GeV/c. The combined effect of MEC and FSI goes away when other models of the FSI, not based on the DEB potential, are employed.

Amaro, J. E.; Maieron, C. [Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Granada, Granada E-18071 (Spain); Barbaro, M. B. [Dipartimento di Fisica Teorica, Universita di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino (Italy); Caballero, J. A. [Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Sevilla, Apdo.1065, E-41080 Sevilla (Spain); Donnelly, T. W. [Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Udias, J. M. [Departamento de Fisica Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, E-28040, Madrid (Spain)

2010-01-15

181

Data on the velocity slip and temperature jump coefficients [gas mass, heat and momentum transfer  

Microsoft Academic Search

When modeling microfluidics, it is necessary to calculate gas flows through micropumps, microvalves and other elements. The heat transfer through a gas at microscale must also be known for modeling of microsystems. Since the size of microsystems is close to the molecular mean free path, the gas rarefaction must be taken into account. If the Knudsen number is moderately small,

Felix Sharipov

2004-01-01

182

A towing concept for orbital transfer of large space structures  

NASA Astrophysics Data System (ADS)

Many studies are being made to determine the most efficient method for the transfer of large space structures from low earth orbits (LEO) to higher altitudes, principally geosynchronous orbits. In this paper, towing is proposed as a possible means of orbital transfer of large space structures. A potential towing arrangement is identified and some of the systems sized for the transfer of a 2460-ft (750 meter) diameter antenna weighing approximately 154,000 lbs (70 metric tons). A savings of approximately 23 metric tons in propellants and structure resulted from the use of a towing arrangement using six towlines in parallel when compared to the use of a single tug hard mounted to the structure being towed. The towing concept appears practical and affords a means of applying loads using multiple towlines to a wide variety of structures without special adaptors.

MacConochie, I. O.; Rehder, J. J.; Price, H. L.; Campbell, T. G.

1981-05-01

183

Large Cash Transfers to the Elderly in South Africa  

Microsoft Academic Search

The authors examine the social pension in South Africa, where large cash sums--about twice the median per capita income of African bouseholds--are paid to people qualified by age but irrespective of previous contributions. They present the history of the scheme and use a 1993 nationally representative survey to investigate the redistributive consequences of the transfers, documenting who receive the pensions,

Anne Case; Angus Deaton

1998-01-01

184

Losses from Simulated Defaults in Canada's Large Value Transfer System  

Microsoft Academic Search

The Large Value Transfer System (LVTS) loss-sharing mechanism was designed to ensure that, in the event of a one-participant default, the collateral pledged by direct members of the system would be sufficient to cover the largest possible net debit position of a defaulting participant. However, the situation may not hold if the indirect effects of the defaults are taken into

Nellie Zhang; Tom Hossfeld

2010-01-01

185

Heat and mass transfer through large openings by natural convection  

Microsoft Academic Search

Convective heat and mass transfer through large openings play an important role in the thermal behaviour of buildings. These phenomena become even more determinant in the case of naturally ventilated buildings. This paper reviews the models describing the involved phenomena due to gravitational and boundary layer pumping flows proposed up to 1992. A sensitivity analysis is also presented, aimed at

M. Santamouris; A. Argiriou; D. Asimakopoulos; N. Klitsikas; A. Dounis

1995-01-01

186

Momentum and heat transfer in the turbulent boundary layer near a rotating disk  

NASA Astrophysics Data System (ADS)

A combined numerical and experimental study was conducted to describe the velocity and temperature fields in the air moving near the surface of a heated rotating disk. Sufficiently mild heating is assumed such that the velocity and the heat transfer problems are decoupled. The velocity field in the turbulent boundary layer is determined using a model suggested by Cebeci and Abbott. Numerical results from this model are combined with experimental data to develop appropriate similarity laws for both the main and cross flow velocity components. Heat transfer from an axisymmetric, ring shaped heat source at the surface of a rotating disk, including the limiting case of a heated disk, is obtained numerically for the laminar, transitional, and turbulent regions of the boundary layer. The results agreed very well with existing experimental correlations, in particular the 1/3 power law relating the surface heat flux and the wall shear stress is found to be valid in both laminar and turbulent flow regimes.

Tadros, S. E.

187

Mechanisms of optical angular momentum transfer to nematic liquid crystalline droplets  

NASA Astrophysics Data System (ADS)

A detailed study is presented that evaluates the relative importance of wave plate behavior, scattering processes and absorption phenomena in transferring optical torque from circularly polarized light to optically trapped nematic droplets. A wide range of parameters is considered: droplet diameters between 1 and 15 ?m, birefringence values from 0.15 to 0.26 and trapping beam powers from 50 mW to 400 mW. Wave plate behavior is verified through the dependence of torque on droplet diameter and material birefringence. The dependence of the magnitude of the torque on material birefringence confirms the additional importance of the scattering mechanism. Absorption processes are found to be negligible.

Wood, Tiffany A.; Gleeson, Helen F.; Dickinson, Mark R.; Wright, Amanda J.

2004-05-01

188

Anisotropic Fermi Couplings due to Large Unquenched Orbital Angular Momentum: Q-band 1H, 14N and 11B ENDOR of bistrispyrazolylborate Co(II)  

PubMed Central

We report Q-band ENDOR of 1H, 14N, and 11B at the g|| extreme of the EPR spectrum of bistrispyrazolylborate Co(II), Co(Tp)2 and two structural analogs. This trigonally symmetric, high-spin (hs) S = 3/2 Co(II) complex shows large unquenched ground–state orbital angular momentum, which leads to highly anisotropic electronic g-values [g|| = 8.48, g? = 1.02]. The large g-anisotropy is shown to result in large dipolar couplings near g|| and uniquely anisotropic 14N Fermi couplings, which arise from spin transferred to the nitrogen 2s orbital (2.2 %) via anti-bonding interactions with singly occupied metal dx2?y2 and dz2 orbitals. Large, well-resolved 1H and 11B dipolar couplings were also observed. Taken in concert with our previous X-band ENDOR measurements at g? (Myers, et al, Inorg. Chem. 2008, 47, 6701–6710), the present data allow a detailed analysis of the dipolar hyperfine tensors of two of the four symmetry distinct protons in the parent molecule. In the substituted analogs, changes in hyperfine coupling due to altered metal-proton distances give further evidence of an anisotropic Fermi contact interaction. For the pyrazolyl 3H proton, the data indicate a 0.2 MHz anisotropic contact interaction and ~ 4 % transfer of spin away from Co(II). Dipolar coupling also dominates for the axial boron atoms, consistent with their distance from the Co(II) ion, and resolved 11B quadrupolar coupling showed ~ 30 % electronic inequivalence between the B-H and B-C sp3 bonds. This is the first comprehensive ENDOR study of any hs Co(II) species and lays the foundation for future development.

Myers, William K.; Scholes, Charles P.; Tierney, David L.

2009-01-01

189

Using Natural Boundary Conditions to Probe the Internal Dynamics of Pyroclastic Flows: Mass, Enthalpy and Momentum Transfer at the Flow-Bed Interface  

Microsoft Academic Search

The interaction of pyroclastic density currents with their substrate plays a significant role in the transport and deposition of these flows. The basal particle concentration of these flows will ultimately determine the mechanism of mass, enthalpy and momentum transfer and the sensitivity of these flows to bed roughness, topography and even their ability to cross bodies of water. In order

J. Dufek; G. W. Bergantz; M. Manga

2006-01-01

190

Evidences from electron momentum spectroscopy for ultra-fast charge transfers and structural reorganizations in a floppy molecule: Ethanol  

Microsoft Academic Search

Calculations of electron momentum distributions employing advanced Dyson orbital theories and statistical thermodynamics beyond the RRHO approximation fail to quantitatively reproduce the outermost momentum profile inferred from experiments on ethanol employing high resolution Electron Momentum Spectroscopy [1]. Study of the influence of nuclear dynamics in the initial ground state and final ionized state indicates that this discrepancy between theory and

Michael S. Deleuze; Balazs Hajgató; Filippo Morini

2009-01-01

191

Heat and momentum transfer in the turbulent boundary layer near a rotating disk  

NASA Astrophysics Data System (ADS)

Results of a combined numerical and experimental study describing the temperature and velocity fields in the turbulent boundary layer near a heated rotating disk are presented. The velocity field is determined using a model suggested by Cebeci and Abbott (1975). Numerical results are combined with experimental data to develop appropriate similarity laws for both the main and cross flow velocities. Heat transfer from an axisymmetric, ring-shaped heat source, including the limiting case of a heated disk, is obtained numerically for the laminar, transitional, and turbulent regions of the boundary layer. The solution shows that the relationship Nu = C Re to the nth power is valid, with n slightly higher for the constant heat flux case than for the isothermal case. Radial heat conduction is noticeable only for very narrow heat sources. It is also noted that the 1/3 power law relating the heat flux/unit area to the local wall shear stress is derivable from the present calculations.

Tadros, S. E.; Erian, F. F.

1983-11-01

192

A unified model for turbulent and laminar momentum transfer - Channel flow  

Microsoft Academic Search

An analysis of fully developed, turbulent transitional flow between parallel plates is presented which is based on the modeling of the burst phenomenon. This analysis gives rise to predictions for the mean velocity profile which are in agreement with experimental data near the wall for transitional turbulent flow in a channel with large aspect ratio. Furthermore, predictions for the mean

L. C. Thomas; C. R. Kakarala

1976-01-01

193

High-momentum transfer behaviour of nucleon form factors from chiral invariant Lagrangians  

NASA Astrophysics Data System (ADS)

We have evaluated the behaviour of the isovector and isoscalar form factors F1(q2) and F2(q2) for large q2 using a chiral invariant Lagrangian to second and third order in perturbation theory. The results depend upon the specific model chosen in this lower-order approximation, but when the effects of higher-order terms are included, the results are in agreement with the usual dipole fit to the electric and magnetic form factors.

Martin, T. P.; Taylor, J. G.

1970-12-01

194

Elastic electron scattering from water vapor and ice at high momentum transfer  

NASA Astrophysics Data System (ADS)

We compare the area, peak separation, and width of the H and O elastic peak for light and heavy water, as observed in spectra of keV electrons scattered over large angles. Peak separation is well reproduced by the theory, but the O:H area ratio is somewhat larger than expected and is equal to the O:D area ratio. Thus no anomalous scattering from H was observed. Only minor differences are observed for scattering from a gaseous or a solid target. The extracted mean kinetic energy of H and D agreed within 5% with the calculated ones for ice. For the more difficult vapor measurements agreement was on a 12% level. A preliminary attempt to extract the O kinetic energy in ice agreed within 10% with the calculated values.

Vos, M.; Weigold, E.; Moreh, R.

2013-01-01

195

Prospect for Measuring G{sup n}{sub E} at High Momentum Transfers  

SciTech Connect

Experiment E02-013, approved by PAC21, will measure the neutron electric form factor at Q{sup 2} up to 3.4 (GeV/c){sup 2}, which is twice that achieved to date. The main features of the new experiment will be the use of the electron spectrometer BigBite, a large array of neutron detectors, and a polarized {sup 3}[vec]He target. We present the parameters and optimization of the experimental setup. A concept of an experiment for G{sup n}{sub E} where precision G{sup p}{sub E} data is used for calibration of the systematics of a Rosenbluth type measurement is also discussed.

Bogdan Wojtsekhowski

2002-05-01

196

Studies of momentum and energy transfer across wavy gas-liquid interfaces  

NASA Astrophysics Data System (ADS)

Two phase gas-liquid flow and its associated interfaces exist in a wide variety of situations of importance to the Navy and this has prompted the study of the basic flow mechanics which underlie this complex process. The existence of wind-wave interactions over large bodies of water have long been recognized as a special case of two phase flow where the presence of the deformable interface plays a complex role in the generation of waves due to the action of the wind. Less well recognized, but of great importance, are situations of two phase flow which are found in component of power systems such as condensers, boiler refrigeration loops, and cryogen lines. Here the characteristics of two phase flow are critical to the reliable design and safe operation of such systems.

Dukler, A. E.

1993-06-01

197

Low-momentum-transfer nonrelativistic limit of the relativistic impulse approximation expression for Compton-scattering doubly differential cross sections and characterization of their relativistic contributions  

SciTech Connect

The nonrelativistic (nr) impulse approximation (NRIA) expression for Compton-scattering doubly differential cross sections (DDCS) for inelastic photon scattering is recovered from the corresponding relativistic expression (RIA) of Ribberfors [Phys. Rev. B 12, 2067 (1975)] in the limit of low momentum transfer (q{yields}0), valid even at relativistic incident photon energies {omega}{sub 1}>m provided that the average initial momentum of the ejected electron is not too high, that is, m using nr expressions when {theta} is small. For example, a 1% accuracy can be obtained when {omega}{sub 1}=1 MeV if {theta}<20 deg. However as {omega}{sub 1} increases into the MeV range, the maximum {theta} at which an accurate Compton peak can be obtained from nr expressions approaches closer to zero, because the {theta} at which the relativistic shift of CP to higher energy is greatest, which starts at 180 deg. when {omega}{sub 1}<300 keV, begins to decrease, approaching zero even though the {theta} at which the relativistic increase in the CP magnitude remains greatest around {theta}=180 deg. The relativistic contribution to the prediction of Compton doubly differential cross sections (DDCS) is characterized in simple terms using Ribberfors further approximation to his full RIA expression. This factorable form is given by DDCS=KJ, where K is the kinematic factor and J the Compton profile. This form makes it possible to account for the relativistic shift of CP to higher energy and the increase in the CP magnitude as being due to the dependence of J(p{sub min},{rho}{sub rel}) (where p{sub min} is the relativistic version of the z component of the momentum of the initial electron and {rho}{sub rel} is the relativistic charge density) and K(p{sub min}) on p{sub min}. This characterization approach was used as a guide for making the nr QED S-matrix expression for the Compton peak kinematically relativistic. Such modified nr expressions can be more readily applied to large systems than the fully relativistic version.

LaJohn, L. A. [Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)

2010-04-15

198

Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo  

NASA Astrophysics Data System (ADS)

Ultrafast laser techniques have revealed extraordinary spin dynamics in magnetic materials that equilibrium descriptions of magnetism cannot explain. Particularly important for future applications is understanding non-equilibrium spin dynamics following laser excitation on the nanoscale, yet the limited spatial resolution of optical laser techniques has impeded such nanoscale studies. Here we present ultrafast diffraction experiments with an X-ray laser that probes the nanoscale spin dynamics following optical laser excitation in the ferrimagnetic alloy GdFeCo, which exhibits macroscopic all-optical switching. Our study reveals that GdFeCo displays nanoscale chemical and magnetic inhomogeneities that affect the spin dynamics. In particular, we observe Gd spin reversal in Gd-rich nanoregions within the first picosecond driven by the non-local transfer of angular momentum from larger adjacent Fe-rich nanoregions. These results suggest that a magnetic material’s microstructure can be engineered to control transient laser-excited spins, potentially allowing faster (~ 1?ps) spin reversal than in present technologies.

Graves, C. E.; Reid, A. H.; Wang, T.; Wu, B.; de Jong, S.; Vahaplar, K.; Radu, I.; Bernstein, D. P.; Messerschmidt, M.; Müller, L.; Coffee, R.; Bionta, M.; Epp, S. W.; Hartmann, R.; Kimmel, N.; Hauser, G.; Hartmann, A.; Holl, P.; Gorke, H.; Mentink, J. H.; Tsukamoto, A.; Fognini, A.; Turner, J. J.; Schlotter, W. F.; Rolles, D.; Soltau, H.; Strüder, L.; Acremann, Y.; Kimel, A. V.; Kirilyuk, A.; Rasing, Th.; Stöhr, J.; Scherz, A. O.; Dürr, H. A.

2013-04-01

199

Four Momentum Transfer Discrepancy in the Charged Current pi+ Production in the MiniBooNE: Data versus Theory  

SciTech Connect

The MiniBooNE experiment has collected what is currently the world's largest sample of {nu}{sub {mu}} charged current single charged pion (CCl{pi}{sup +}) interactions, roughly 46,000 events. The purity of the CCl{pi}{sup +} sample is 87% making this the purest event sample observed in the MiniBooNE detector. The average energy of neutrinos producing CC{pi}{sup +} interactions in MiniBooNE is about 1 GeV, therefore the study of these events can provide insight into both resonant and coherent pion production processes. In this talk, we will discuss the long-standing discrepancy in four-momentum transfer observed between CC{pi}{sup +} data and existing predictions. Several attempts to address this problem will be presented. Specifically, the Rein-Sehgal model has been extended to include muon mass terms for both resonant and coherent production. Using calculations from, an updated form for the vector form factor has also been adopted. The results of this improved description of CC{pi}{sup +} production will be compared to the high statistics MiniBooNE CC{pi}{sup +} data and several existing parametrizations of the axial vector form factor.

Nowak, Jaroslaw A.; /Louisiana State U.

2009-09-01

200

Momentum Transfer from a Nuclear Stand-Off Burst to a Potentially Hazardous Asteroid or Comet Nucleus  

NASA Astrophysics Data System (ADS)

We present estimates of momentum transfer by ablation and ? factor-like ejection of solid material from the surface of a Potentially Hazardous Object (PHO) by a stand-off nuclear burst. We consider parameters including object composition, shadowing effects of surface geometry, burst yield, and stand-off distance. We use radiation hydrocode models of x-ray energy deposition to estimate the response of a PHO to x-rays. We also use Monte Carlo models to estimate energy deposition from neutrons. These models yield estimates of the mass of vapor and solid material ejected from the surface of the PHO. A byproduct of the Monte Carlo models is an estimate of neutron activation of PHO material, a commonly quoted hazard of nuclear PHO deflection, which is negligible, of order tens of micrograms per kiloton of burst yield. The mass vaporized or ejected from the PHO, along with initial distributions and velocities can then be used to refine n-body models of velocity change and debris reaggregation.

Plesko, C. S.; Weaver, R.; Huebner, W. F.

2011-12-01

201

Measurements of the Nucleon Form-Factors at Large Momentum Transfers  

SciTech Connect

New measurements of the electric GE(Q2) and magnetic GM(Q2) form factors of the nucleons are reported. The proton data cover the Q2 range from 1.75 to 8.83 (GeV/c)2 and the neutron data from 1.75 to 4.00 (GeV/c)2, more than doubling the range of previous data. Scaled by the dipole fit, GD(Q2), the results forGMp(Q2) /¿pGD(Q2) decrease smoothly from 1.05 to 0.92, while GEp(Q2)/GD(Q2)is consistent with unity. The preliminary results for GMn(Q2) /¿nGD(Q2) are consistent with unity, while GEn is consistent with zero at all values of Q2.

L Andivahis; Peter Bosted; Allison Lung; Linda Stuart; Jonas Alster; Raymond Arnold; C. Chang; Frank Dietrich; William Dodge; R Gearhart; Javier Gomez; Keith Griffioen; William Hicks; Charles Hyde-Wright; Cynthia Keppel; Sebastian Kuhn; Jechiel Lichtenstadt; Rory Miskimen; Gerald Peterson; Gerassimos Petratos; Stephen Rock; Sayed Rokni; Willis Sakumoto; Michael Spengos; Ken Swartz; L. Tao

1992-07-26

202

Measurement of the deuteron elastic structure functions at large momentum transfers  

SciTech Connect

The cross section for elastic electron-deuteron scattering has been measured using the Hall A Facility of Jefferson Laboratory. Scattered electrons and recoiling deuterons were detected in coincidence in the two 4 GeV/c High Resolution Spectrometers (HRS) of Hall A. The deuteron elastic structure functions A(Q{sup 2}) and B(Q{sup 2}) have been extracted from these data. Results for the measurement of A(Q{sup 2}) in the range of 0.7 ? Q{sup 2} ? 6.0 (GeV/c){sup 2} are reported. Results for the magnetic structure function, B(Q{sup 2}), are presented in the range of 0.7 ? Q{sup 2} ? 1.35 (GeV/c){sup 2}. The results for both structure functions are compared to predictions of meson-nucleon based models, both with and without the inclusion of meson-exchange currents. The A(Q{sup 2}) results are compared to predictions of the dimensional scaling quark model and perturbative quantum chromodynamics. The results can provide insights into the transition from meson-nucleon to quark-gluon descriptions of the nuclear two-body system.

Kathy McCormick

1999-08-01

203

Linear momentum transfer in 292-MeV /sup 20/Ne-induced fission of /sup 165/Ho, /sup 181/Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U  

SciTech Connect

Angular correlations of fragments both in and out of the reaction plane from 292-MeV /sup 20/Ne-induced fission of /sup 165/Ho, /sup 181/Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U have been measured. The correlated data have been evaluated in terms of a full linear momentum transfer component and less than full linear momentum components. The method of evaluation has also been applied to other available data for /sup 16/O- and /sup 20/Ne-induced reactions. The maximum angular momentum l/sub FLMT/ associated with full linear momentum transfer for the systems analyzed agrees with the predictions of a classical dynamical model based on the proximity nuclear potential and one-body nuclear friction. Because of projectile breakup, the angular momentum distribution in the composite nucleus is markedly distorted from the (2l+1) distribution expected for full linear momentum transfer.

Tubbs, L.E.; Birkelund, J.R.; Huizenga, J.R.; Hilscher, D.; Jahnke, U.; Rossner, H.; Gebauer, B.

1985-07-01

204

Linear momentum transfer in 292-MeV /sup 20/Ne-induced fission of /sup 165/Ho, /sup 18/1Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U  

SciTech Connect

Angular correlations of fragments both in and out of the reaction plane from 292-MeV /sup 20/Ne-induced fission of /sup 165/Ho, /sup 181/Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U have been measured. The correlated data have been evaluated in terms of a full linear momentum transfer component and less than full linear momentum components. The method of evaluation has also been applied to other available data for /sup 16/O- and /sup 20/Ne-induced reactions. The maximum angular momentum l/sub FLMT/ associated with full linear momentum transfer for the systems analyzed agrees with the predictions of a classical dynamical model based on the proximity nuclear potential and one-body nuclear friction. Because of projectile breakup, the angular momentum distribution in the composite nucleus is markedly distorted from the (2l + 1) distribution expected for full linear momentum transfer.

Tubbs, L.E.; Birkelund, J.R.; Huizenga, J.R.; Hilscher, D.; Jahnke, U.; Rossner, H.; Gebauer, B.

1985-07-01

205

Vertical flux of horizontal momentum transported by large amplitude GWs above Southern Andes, the Drake Passage and the Antarctic Peninsula  

NASA Astrophysics Data System (ADS)

We analyze large-amplitude mountain and shear gravity waves above the Andes range to the south of the highest tops (around 32S), the Patagonia region and its prolongation in the Antarctic Peninsula, from Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009. This study was mainly motivated by long-term satellite observations of large amplitude gravity waves in the lower and middle atmosphere as well as the recent design of a research program to investigate these features in detail: the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. From 1 June to 31 August 2009, several case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified, after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. The synoptic circulation for each case is described. The calculated zonal and meridional components of the vertical flux of horizontal momentum are shown. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region is performed. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio is generally less than 1 below the lower stratosphere.

De la Torre, Alejandro; Wickert, Jens; Schmidt, Torsten; Alexander, Peter; Hierro, R.; Llamedo, Pablo; Rolla, Alfredo

2012-07-01

206

Analysis of momentum and energy transfer in a lid-driven cavity filled with a porous medium  

Microsoft Academic Search

The laminar transport processes in a lid-driven square cavity filled with a water-saturated porous medium is presented in this numerical investigation. A stable thermal stratification configuration is considered by imposing a vertical temperature gradient. The general formulation of the momentum equation is used such that both the inertial and viscous effects are incorporated. The relevant momentum and energy characteristics of

Abdalla M. Al-Amiri

2000-01-01

207

Momentum transfer in the boundary layer when there is acceleration and combustion of ethanol as it evaporates behind a barrier  

SciTech Connect

Experimental data have been gathered on the local parameters of a boundary layer gas flow with ethanol combustion behind a 3 mm-high rib. These parameters include averaged velocities, temperatures, concentrations of stable substances and OH radicals and mass fluxes on the wall. The temperature and composition of the gases were studied with probe methods (thermocouple and chromatography). To measure the velocity and concentration of radicals, we applied the laser optical measurement methods of LDA and LIF. We propose a way of processing the obtained data utilizing balances in the continuity and motion equations. The influence of incident flow acceleration on the viscous and turbulent shear stresses at the wall and in the volume of the boundary layer has been analyzed to determine the acceleration parameters to be K = (0, 0.7, 1.3, and 4.1) x 10{sup -6}. It is shown that without a longitudinal pressure gradient (K = 0) on the combustion that is behind the rib, OH radicals accumulate with their highest concentrations existing in areas that do not coincide with the flame front and are shifted toward the oxidizer. The main mechanism of momentum transfer is connected to the boundary layer separation. In the presence of acceleration caused by a negative longitudinal pressure gradient, the detachment area does not show up (in experiments with K > 0.7 x 10{sup -6}); shear stresses increase substantially and reach one percent of the dynamic pressure. The general level of turbulent stresses in the reacting boundary layer becomes higher than in the case without acceleration. The incident airflow is also accelerated by the reacting boundary layer in which the maximum velocity is formed. (author)

Boyarshinov, B.F.; Titkov, V.I.; Fedorov, S.Yu. [Institute of Thermophysics SB RAS, Novosibirsk (Russian Federation)

2010-08-15

208

Elastic electron-deuteron scattering and the electric neutron form factor at four-momentum transfers 5 fm-2 < q2 < 14 fm-2  

Microsoft Academic Search

The cross section for elastic electron-deuteron scattering was measured for ten four-momentum transfers squared in the range 5fm-2

S. Galster; H. Klein; J. Moritz; K. H. Schmidt; D. Wegener; J. Bleckwenn

1971-01-01

209

Disentangling full and partial linear momentum transfer events in the ¹O+¹Tm system at E{sub proj}{<=}5.4 MeV\\/nucleon  

Microsoft Academic Search

Forward recoil ranges of heavy reaction products have been measured to disentangle full and\\/or partial linear momentum transfer events in the ¹O+¹Tm system at E{sub proj}76 and 81 MeV. The experimentally measured forward recoil ranges of complete and\\/or incomplete fusion products are found to be in satisfactory agreement with that estimated using range-energy formulations. The angular distributions of several heavy

Unnati Gupta; Pushpendra P. Singh; Devendra P. Singh; Manoj Kumar Sharma; Abhishek Yadav; B. P. Singh; R. Prasad; R. Kumar; S. Gupta; H. D. Bhardwaj

2009-01-01

210

Disentangling full and partial linear momentum transfer events in the O16+Tm169 system at Eproj<=5.4 MeV\\/nucleon  

Microsoft Academic Search

Forward recoil ranges of heavy reaction products have been measured to disentangle full and\\/or partial linear momentum transfer events in the O16+Tm169 system at Eproj≈76 and 81 MeV. The experimentally measured forward recoil ranges of complete and\\/or incomplete fusion products are found to be in satisfactory agreement with that estimated using range-energy formulations. The angular distributions of several heavy reaction

Unnati Gupta; Pushpendra P. Singh; Devendra P. Singh; Manoj Kumar Sharma; Abhishek Yadav; R. Kumar; S. Gupta; H. D. Bhardwaj; B. P. Singh; R. Prasad

2009-01-01

211

27 CFR 478.40a - Transfer and possession of large capacity ammunition feeding devices.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2010-04-01 true Transfer and possession of large capacity ammunition...Miscellaneous Provisions § 478.40a Transfer and possession of large capacity ammunition...a) Prohibition. No person shall transfer or possess a large capacity...

2011-04-01

212

Forward-backward asymmetries of lepton pairs in events with a large-transverse-momentum jet at hadron colliders.  

PubMed

We discuss forward-backward charge asymmetries for lepton-pair production in association with a large-transverse-momentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction A(j)(FB) gives a new determination of the effective weak mixing angle sin((2)theta(lept)(eff)(M(2)(Z)) with a statistical precision after cuts of approximately 10(-3) (8x10(-3)) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2x10(-4). The identification of b jets also allows for the measurement of the bottom-quark-Z asymmetry A(b)(FB) at hadron colliders, the resulting statistical precision for sin((2)theta(lept)(eff)(M(2)(Z)) being approximately 9x10(-4) (2x10(-2) at Tevatron), also lower than the reported precision at e(+)e(-) colliders, 3x10(-4). PMID:12398714

del Aguila, F; Ametller, Ll; Talavera, P

2002-10-01

213

Electrically and magnetically controlled optical spanner based on the transfer of spin angular momentum of light in an optically active medium  

SciTech Connect

An optical spanner is a light beam that can exert a torque on an object. It is demonstrated in this Rapid Communication that, with the aid of applied electric and magnetic fields, a light beam with initially linear polarization and initially zero total spin angular momentum can interact with an optically active medium, resulting in a change of the ratio of left-handed circularly polarized photons to right-handed ones. Thus the total spin angular momentum of the light is changed, which leads to a torque, creating an electrically and magnetically controlled optical spanner on the medium. For a linearly polarized 632.8 nm laser beam incident on a 100-{mu}m-long Ce:Bi{sub 12}TiO{sub 20} whisker crystal with 5 {mu}m radius, if the magnetic field is fixed at -1.8 T, both the left- (right-)handed circularly polarized photon number and the total spin angular momentum vary with the applied electric field in a sinusoidal way, which means the torque exerted by the optical spanner on the crystal also varies sinusoidally with the electric field. It is found that at 50 (or-50) kV/cm, 56% right- (left-)handed circularly polarized photons are translated into left- (right-)handed ones, which corresponds to a transfer of 0.56({Dirac_h}/2{pi}) spin angular momentum contributed by each photon.

Chen Lixiang; Zheng Guoliang; She Weilong [State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275 (China)

2007-06-15

214

Frame-assisted membrane transfer for large area optoelectronic devices on flexible substrates  

Microsoft Academic Search

Frame assisted membrane transfer process was developed to transfer large area crystalline semiconductor nanomembranes on flexible plastic substrates. InP nanomembranes as large as 2cm×2cm was transferred successfully. Large area flexible photodetectors, solar cells and LED arrays all have been demonstrated experimentally, based on transferred InP nanomembranes. Flexible optoelectronics devices based on single crystal semiconductor nanomembranes (NM), which combine the advantages

Weiquan Yang; Hongjun Yang; Santhad Chuwongin; Jung-Hun Seo; Zhenqiang Ma; Jesper Berggren; Mattias Hammar; Weidong Zhou

2011-01-01

215

Sheep: the first large animal model in nuclear transfer research.  

PubMed

Abstract The scope of this article is not to provide an exhaustive review of nuclear transfer research, because many authoritative reviews exist on the biological issues related to somatic and embryonic cell nuclear transfer. We shall instead provide an overview on the work done specifically on sheep and the value of this work on the greater nuclear transfer landscape. PMID:24033140

Loi, Pasqualino; Czernik, Marta; Zacchini, Federica; Iuso, Domenico; Scapolo, Pier Augusto; Ptak, Grazyna

2013-09-13

216

The magnetospheric boundary layer - Site of plasma, momentum and energy transfer from the magnetosheath into the magnetosphere  

Microsoft Academic Search

IMP 6 plasma probe and magnetometer observations indicate that solar wind plasma, momentum and energy are imparted to the magnetosphere in the magnetospheric boundary layer. Over much of the dayside surface of the magnetosphere, the boundary layer is on closed magnetic field lines and acts as an MHD generator. Its depolarizing currents, generated by the boundary layer plasma flow, constitute

T. E. Eastman; E. W. Hones Jr.; S. J. Bame; J. R. Asbridge

1976-01-01

217

Large area transferred silicon nanomembrane photonic devices on unconventional substrates  

NASA Astrophysics Data System (ADS)

Silicon microelectronics on unconventional substrates has led to numerous unprecedented applications. Inspired by the great success, it is a natural desire to integrate silicon photonic circuitry on unconventional substrates in the hope of extending the applicability range of silicon photonics to a multitude of novel hybrid silicon photonic devices. However, photonic devices usually have larger dimensions and more complicated morphologies. The transfer method used in electronics cannot be applied directly to transfer photonic devices. Here, we propose a low temperature transfer technique based on adhesive bonding and deep reactive ion etching. A defect-free transfer of 2 cm × 2 cm, 250 nm thick silicon nanomembrane onto a glass slide has been demonstrated. Single mode waveguides and splitters fabricated on the transferred SiNM exhibit comparable results to those fabricated on silicon-on-insulator. With a low process temperature, this method can be easily applied to transfer silicon nanomembranes onto various types of substrates.

Xu, Xiaochuan; Subbaraman, Harish; Hosseini, Amir; Kwong, David; Chen, Ray T.

2013-02-01

218

Electromagnetic momentum conservation in media  

NASA Astrophysics Data System (ADS)

That static electric and magnetic fields can store momentum may be perplexing, but is necessary to ensure total conservation of momentum. Simple situations in which such field momentum is transferred to nearby bodies and point charges have often been considered for pedagogical purposes, normally assuming vacuum surroundings. If dielectric media are involved, however, the analysis becomes more delicate, not least since one encounters the electromagnetic energy-momentum problem in matter, the 'Abraham-Minkowski enigma', of what the momentum is of a photon in matter. We analyze the momentum balance in three nontrivial examples obeying azimuthal symmetry, showing how the momentum conservation is satisfied as the magnetic field decays and momentum is transferred to bodies present. In the last of the examples, that of point charge outside a dielectric sphere in an infinite magnetic field, we find that not all of the field momentum is transferred to the nearby bodies; a part of the momentum appears to vanish as momentum flux towards infinity. We discuss this and other surprising observations which can be attributed to the assumption of magnetic fields of infinite extent. We emphasize how formal arguments of conserved quantities cannot determine which energy-momentum tensor is more "correct", and each of our conservation checks may be performed equally well in the Minkowski or Abraham framework.

Brevik, Iver; Ellingsen, Simen Å.

2011-03-01

219

Electromagnetic momentum conservation in media  

SciTech Connect

That static electric and magnetic fields can store momentum may be perplexing, but is necessary to ensure total conservation of momentum. Simple situations in which such field momentum is transferred to nearby bodies and point charges have often been considered for pedagogical purposes, normally assuming vacuum surroundings. If dielectric media are involved, however, the analysis becomes more delicate, not least since one encounters the electromagnetic energy-momentum problem in matter, the 'Abraham-Minkowski enigma', of what the momentum is of a photon in matter. We analyze the momentum balance in three nontrivial examples obeying azimuthal symmetry, showing how the momentum conservation is satisfied as the magnetic field decays and momentum is transferred to bodies present. In the last of the examples, that of point charge outside a dielectric sphere in an infinite magnetic field, we find that not all of the field momentum is transferred to the nearby bodies; a part of the momentum appears to vanish as momentum flux towards infinity. We discuss this and other surprising observations which can be attributed to the assumption of magnetic fields of infinite extent. We emphasize how formal arguments of conserved quantities cannot determine which energy-momentum tensor is more 'correct', and each of our conservation checks may be performed equally well in the Minkowski or Abraham framework.

Brevik, Iver [Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim (Norway); Ellingsen, Simen A., E-mail: simen.a.ellingsen@ntnu.no [Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim (Norway)

2011-03-15

220

Measurements of the proton elastic-form-factor ratio mu pG p E/G p M at low momentum transfer.  

PubMed

High-precision measurements of the proton elastic form-factor ratio, mu pG p E/G p M, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5 GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to G p E being smaller than expected. PMID:18233135

Ron, G; Glister, J; Lee, B; Allada, K; Armstrong, W; Arrington, J; Beck, A; Benmokhtar, F; Berman, B L; Boeglin, W; Brash, E; Camsonne, A; Calarco, J; Chen, J P; Choi, Seonho; Chudakov, E; Coman, L; Craver, B; Cusanno, F; Dumas, J; Dutta, C; Feuerbach, R; Freyberger, A; Frullani, S; Garibaldi, F; Gilman, R; Hansen, O; Higinbotham, D W; Holmstrom, T; Hyde, C E; Ibrahim, H; Ilieva, Y; de Jager, C W; Jiang, X; Jones, M K; Kang, H; Kelleher, A; Khrosinkova, E; Kuchina, E; Kumbartzki, G; LeRose, J J; Lindgren, R; Markowitz, P; May-Tal Beck, S; McCullough, E; Meekins, D; Meziane, M; Meziani, Z-E; Michaels, R; Moffit, B; Norum, B E; Oh, Y; Olson, M; Paolone, M; Paschke, K; Perdrisat, C F; Piasetzky, E; Potokar, M; Pomatsalyuk, R; Pomerantz, I; Puckett, A; Punjabi, V; Qian, X; Qiang, Y; Ransome, R; Reyhan, M; Roche, J; Rousseau, Y; Saha, A; Sarty, A J; Sawatzky, B; Schulte, E; Shabestari, M; Shahinyan, A; Shneor, R; Sirca, S; Slifer, K; Solvignon, P; Song, J; Sparks, R; Subedi, R; Strauch, S; Urciuoli, G M; Wang, K; Wojtsekhowski, B; Yan, X; Yao, H; Zhan, X; Zhu, X

2007-11-13

221

Deuteron electrodisintegration in the ? resonance region at a four-momentum transfer Q2 = 0.23 (GeV/c)2  

NASA Astrophysics Data System (ADS)

We report on measurements on the reaction d(e, e'p)n in the invariant mass range of the final hadronic system 1.965 GeV <= W <= 2.335 GeV. At an average four-momentum transfer Q2 = 0.23 (GeV/c)2 the outgoing proton was detected at a c.m. angle ?p = 80° in coincidence with the scattered electron. The measured differential cross sections are compared with theoretical calculations which include final state interactions, meson exchange currents and isobar contributions. Procter & Gamble, Euskirchen.

Breuker, H.; Burkert, V.; Ehses, E.; Hartfiel, U.; Knop, G.; Kroesen, G.; Langen, J.; Leenen, M.; Mehnert, W.; Samel, A.; Sauerwein, R.; Schablitzky, H. D.; Schnicke, G.

1986-07-01

222

Influence of Momentum and Heat Losses on the Large-Scale Stability of Quasi2D Premixed Flames  

Microsoft Academic Search

We consider premixed gaseous flames propagating between parallel plates (Hele-Shaw cell) and qualitatively analyze how the resulting losses of momentum and heat affect the flame stability for wavelengths of wrinkling that noticeably exceed the plate spacing. Modelling the flame as an effective interface and using Euler-Darcy equations for the gas on both sides, we firstly show that friction to adiabatic

G. JOULIN; G. SIVASHINSKY

1994-01-01

223

Transfer of spin angular momentum from Cs vapor to nearby Cs salts through laser-induced spin currents  

SciTech Connect

Optical pumping of alkali-metal atoms in vapor cells causes spin currents to flow to the cell walls where excess angular momentum accumulates in the wall nuclei. Experiments reported here indicate that the substantial enhancement of the nuclear-spin polarization of salts at the cell walls is primarily due to the nuclear-spin current, with a lesser contribution from the electron-spin current of the vapor.

Ishikawa, K.; Patton, B.; Olsen, B. A.; Jau, Y.-Y.; Happer, W. [Graduate School of Material Science, University of Hyogo, Ako-gun, Hyogo 678-1297 (Japan); Joseph Henry Laboratory, Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)

2011-06-15

224

Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at sNN=200 GeV  

Microsoft Academic Search

We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum (pT) for d+Au collisions at sNN=200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction) to those at forward rapidity (d beam direction). The identified hadrons are measured in the rapidity regions |y|<0.5 and

B. I. Abelev; J. Adams; M. M. Aggarwal; Z. Ahammed; J. Amonett; B. D. Anderson; M. Anderson; D. Arkhipkin; G. S. Averichev; Y. Bai; J. Balewski; O. Barannikova; L. S. Barnby; J. Baudot; S. Bekele; V. V. Belaga; A. Bellingeri-Laurikainen; R. Bellwied; F. Benedosso; S. Bhardwaj; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; L. C. Bland; S.-L. Blyth; B. E. Bonner; M. Botje; J. Bouchet; A. V. Brandin; A. Bravar; M. Bystersky; R. V. Cadman; X. Z. Cai; H. Caines; M. Calderón De La Barca Sánchez; J. Castillo; O. Catu; D. Cebra; Z. Chajecki; P. Chaloupka; S. Chattopadhyay; H. F. Chen; J. H. Chen; J. Cheng; M. Cherney; A. Chikanian; W. Christie; J. P. Coffin; T. M. Cormier; M. R. Cosentino; J. G. Cramer; H. J. Crawford; D. Das; S. Das; M. Daugherity; M. M. De Moura; T. G. Dedovich; M. Dephillips; A. A. Derevschikov; L. Didenko; T. Dietel; P. Djawotho; S. M. Dogra; W. J. Dong; X. Dong; J. E. Draper; F. Du; V. B. Dunin; J. C. Dunlop; M. R. Dutta Mazumdar; V. Eckardt; W. R. Edwards; L. G. Efimov; V. Emelianov; J. Engelage; G. Eppley; B. Erazmus; M. Estienne; P. Fachini; R. Fatemi; J. Fedorisin; K. Filimonov; P. Filip; E. Finch; V. Fine; Y. Fisyak; J. Fu; C. A. Gagliardi; L. Gaillard; M. S. Ganti; V. Ghazikhanian; P. Ghosh; J. E. Gonzalez; Y. G. Gorbunov; H. Gos; O. Grebenyuk; D. Grosnick; S. M. Guertin; K. S. F. F. Guimaraes; Y. Guo; N. Gupta; T. D. Gutierrez; B. Haag; T. J. Hallman; A. Hamed; J. W. Harris; W. He; M. Heinz; T. W. Henry; S. Hepplemann; B. Hippolyte; A. Hirsch; E. Hjort; A. M. Hoffman; G. W. Hoffmann; M. J. Horner; H. Z. Huang; S. L. Huang; E. W. Hughes; T. J. Humanic; G. Igo; P. Jacobs; W. W. Jacobs; P. Jakl; F. Jia; H. Jiang; P. G. Jones; E. G. Judd; S. Kabana; K. Kang; J. Kapitan; M. Kaplan; D. Keane; A. Kechechyan; V. Yu. Khodyrev; B. C. Kim; J. Kiryluk; A. Kisiel; E. M. Kislov; S. R. Klein; A. Kocoloski; D. D. Koetke; T. Kollegger; M. Kopytine; L. Kotchenda; V. Kouchpil; K. L. Kowalik; M. Kramer; P. Kravtsov; V. I. Kravtsov; K. Krueger; C. Kuhn; A. I. Kulikov; A. Kumar; A. A. Kuznetsov; M. A. C. Lamont; J. M. Landgraf; S. Lange; S. Lapointe; F. Laue; J. Lauret; A. Lebedev; R. Lednicky; C.-H. Lee; S. Lehocka; M. J. Levine; C. Li; Q. Li; Y. Li; G. Lin; X. Lin; S. J. Lindenbaum; M. A. Lisa; F. Liu; H. Liu; J. Liu; L. Liu; Z. Liu; T. Ljubicic; W. J. Llope; H. Long; R. S. Longacre; M. Lopez-Noriega; W. A. Love; Y. Lu; T. Ludlam; D. Lynn; G. L. Ma; J. G. Ma; Y. G. Ma; D. Magestro; D. P. Mahapatra; R. Majka; L. K. Mangotra; R. Manweiler; S. Margetis; C. Markert; L. Martin; H. S. Matis; Yu. A. Matulenko; C. J. McClain; T. S. McShane; Yu. Melnick; A. Meschanin; J. Millane; M. L. Miller; N. G. Minaev; S. Mioduszewski; C. Mironov; A. Mischke; D. K. Mishra; J. Mitchell; B. Mohanty; L. Molnar; C. F. Moore; D. A. Morozov; M. G. Munhoz; B. K. Nandi; C. Nattrass; T. K. Nayak; J. M. Nelson; P. K. Netrakanti; V. A. Nikitin; L. V. Nogach; S. B. Nurushev; G. Odyniec; A. Ogawa; V. Okorokov; M. Oldenburg; D. Olson; M. Pachr; S. K. Pal; Y. Panebratsev; S. Y. Panitkin; A. I. Pavlinov; T. Pawlak; T. Peitzmann; V. Perevoztchikov; C. Perkins; W. Peryt; V. A. Petrov; S. C. Phatak; R. Picha; M. Planinic; J. Pluta; N. Poljak; N. Porile; J. Porter; A. M. Poskanzer; M. Potekhin; E. Potrebenikova; B. V. K. S. Potukuchi; D. Prindle; C. Pruneau; J. Putschke; G. Rakness; R. Raniwala; S. Raniwala; R. L. Ray; S. V. Razin; J. Reinnarth; D. Relyea; F. Retiere; A. Ridiger; H. G. Ritter; J. B. Roberts; O. V. Rogachevskiy; J. L. Romero; A. Rose; C. Roy; L. Ruan; M. J. Russcher; R. Sahoo; T. Sakuma; S. Salur; J. Sandweiss; M. Sarsour; P. S. Sazhin; J. Schambach; R. P. Scharenberg; N. Schmitz; K. Schweda; J. Seger; I. Selyuzhenkov; P. Seyboth; A. Shabetai; E. Shahaliev; M. Shao; M. Sharma; W. Q. Shen; S. S. Shimanskiy; E. Sichtermann; F. Simon; R. N. Singaraju; N. Smirnov; R. Snellings; G. Sood; P. Sorensen; J. Sowinski; J. Speltz; H. M. Spinka; B. Srivastava; A. Stadnik; T. D. S. Stanislaus; R. Stock; A. Stolpovsky; M. Strikhanov; B. Stringfellow; A. A. P. Suaide; E. Sugarbaker; M. Sumbera; Z. Sun; B. Surrow; M. Swanger; T. J. M. Symons; A. Szanto De Toledo; A. Tai; J. Takahashi; A. H. Tang; T. Tarnowsky; D. Thein; J. H. Thomas; A. R. Timmins; S. Timoshenko; M. Tokarev; T. A. Trainor; S. Trentalange; R. E. Tribble; O. D. Tsai; J. Ulery; T. Ullrich; D. G. Underwood; G. Van Buren; N. Van Der Kolk; M. Van Leeuwen; A. M. Vander Molen; R. Varma; I. M. Vasilevski; A. N. Vasiliev; R. Vernet; S. E. Vigdor; Y. P. Viyogi; S. Vokal; S. A. Voloshin; W. T. Waggoner; F. Wang; G. Wang; J. S. Wang; X. L. Wang; Y. Wang; J. W. Watson; J. C. Webb; G. D. Westfall; A. Wetzler; C. Whitten Jr.; H. Wieman; S. W. Wissink; R. Witt; J. Wood; J. Wu; N. Xu; Q. H. Xu; Z. Xu; P. Yepes; I.-K. Yoo; V. I. Yurevich; W. Zhan; H. Zhang; W. M. Zhang; Y. Zhang; Z. P. Zhang; Y. Zhao; C. Zhong; R. Zoulkarneev

2007-01-01

225

Search for physics beyond the standard model in events with ? leptons, jets, and large transverse momentum imbalance in pp collisions at ?{s}=7 TeV  

NASA Astrophysics Data System (ADS)

A search for physics beyond the standard model is performed with events having one or more hadronically decaying ? leptons, highly energetic jets, and large transverse momentum imbalance. The data sample corresponds to an integrated luminosity of 4.98 fb-1 of proton-proton collisions at collected with the CMS detector at the LHC in 2011. The number of observed events is consistent with predictions for standard model processes. Lower limits on the mass of the gluino in supersymmetric models are determined.

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hammer, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Gonzalez Suarez, R.; Kalogeropoulos, A.; Maes, M.; Olbrechts, A.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Clerbaux, B.; De Lentdecker, G.; Dero, V.; Gay, A. P. R.; Hreus, T.; Léonard, A.; Marage, P. E.; Mohammadi, A.; Reis, T.; Thomas, L.; Vander Marcken, G.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Cimmino, A.; Costantini, S.; Garcia, G.; Grunewald, M.; Klein, B.; Lellouch, J.; Marinov, A.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; Walsh, S.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Bruno, G.; Castello, R.; Ceard, L.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Lemaitre, V.; Liao, J.; Militaru, O.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá Júnior, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, A.; Anjos, T. S.; Bernardes, C. A.; Dias, F. A.; Fernandez Perez Tomei, T. R.; Gregores, E. M.; Lagana, C.; Marinho, F.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Genchev, V.; Iaydjiev, P.; Piperov, S.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Tcholakov, V.; Trayanov, R.; Vutova, M.; Dimitrov, A.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Jiang, C. H.; Liang, D.; Liang, S.; Meng, X.; Tao, J.; Wang, J.; Wang, X.; Wang, Z.; Xiao, H.; Xu, M.; Zang, J.; Zhang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, D.; Zhang, L.; Zou, W.; Avila, C.; Gomez, J. P.; Gomez Moreno, B.; Osorio Oliveros, A. F.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Plestina, R.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Duric, S.; Kadija, K.; Luetic, J.; Morovic, S.; Attikis, A.; Galanti, M.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Ellithi Kamel, A.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, M.; Raidal, M.; Rebane, L.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Ungaro, D.; Wendland, L.; Banzuzi, K.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Millischer, L.; Nayak, A.; Rander, J.; Rosowsky, A.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; Granier de Cassagnac, R.; Haguenauer, M.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Sabes, D.; Salerno, R.; Sirois, Y.; Veelken, C.; Zabi, A.; Agram, J.-L.; Andrea, J.; Bloch, D.; Bodin, D.; Brom, J.-M.; Cardaci, M.; Chabert, E. C.; Collard, C.; Conte, E.; Drouhin, F.; Ferro, C.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Sgandurra, L.; Sordini, V.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Anagnostou, G.; Autermann, C.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.; Jussen, R.; Klein, K.

2013-07-01

226

Search for diphoton events with large missing transverse momentum in 7 TeV proton-proton collision data with the ATLAS detector  

Microsoft Academic Search

A search for diphoton events with large missing transverse momentum has been performed using proton-proton collision data at $\\\\sqrt{s}$ = 7 TeV recorded with the ATLAS detector, corresponding to an integrated luminosity of 4.8 fb$^{-1}$. No excess of events was observed above the Standard Model prediction and model-dependent 95% confidence level exclusion limits are set. In the context of a

Georges Aad; Tatevik Abajyan; Brad Abbott; Jalal Abdallah; Samah Abdel Khalek; Ahmed Ali Abdelalim; Ovsat Abdinov; Rosemarie Aben; Babak Abi; Maris Abolins; Ossama AbouZeid; Halina Abramowicz; Henso Abreu; Emilio Acerbi; Bobby Samir Acharya; Leszek Adamczyk; David Adams; Tetteh Addy; Jahred Adelman; Stefanie Adomeit; Paolo Adragna; Tim Adye; Scott Aefsky; Juan Antonio Aguilar-Saavedra; Marco Agustoni; Mohamed Aharrouche; Steven Ahlen; Florian Ahles; Ashfaq Ahmad; Mahsana Ahsan; Giulio Aielli; Taylan Akdogan; Torsten Paul Ake Åkesson; Ginga Akimoto; Andrei Akimov; Mohammad Alam; Muhammad Aftab Alam; Justin Albert; Solveig Albrand; Martin Aleksa; Igor Aleksandrov; Franco Alessandria; Calin Alexa; Gideon Alexander; Gauthier Alexandre; Theodoros Alexopoulos; Muhammad Alhroob; Malik Aliev; Gianluca Alimonti; John Alison; Benedict Allbrooke; Phillip Allport; Sarah Allwood-Spiers; John Almond; Alberto Aloisio; Raz Alon; Alejandro Alonso; Francisco Alonso; Barbara Alvarez Gonzalez; Mariagrazia Alviggi; Katsuya Amako; Christoph Amelung; Vladimir Ammosov; Susana Patricia Amor Dos Santos; Antonio Amorim; Nir Amram; Christos Anastopoulos; Lucian Stefan Ancu; Nansi Andari; Timothy Andeen; Christoph Falk Anders; Gabriel Anders; Kelby Anderson; Attilio Andreazza; George Victor Andrei; Marie-Laure Andrieux; Xabier Anduaga; Philipp Anger; Aaron Angerami; Francis Anghinolfi; Alexey Anisenkov; Nuno Anjos; Alberto Annovi; Ariadni Antonaki; Mario Antonelli; Alexey Antonov; Jaroslav Antos; Fabio Anulli; Masato Aoki; Sahar Aoun; Ludovica Aperio Bella; Rudi Apolle; Giorgi Arabidze; Ignacio Aracena; Yasuo Arai; Ayana Arce; Samir Arfaoui; Jean-Francois Arguin; Engin Arik; Metin Arik; Aaron James Armbruster; Olivier Arnaez; Vanessa Arnal; Christian Arnault; Andrei Artamonov; Giacomo Artoni; David Arutinov; Shoji Asai; Ruslan Asfandiyarov; Stefan Ask; Barbro Åsman; Lily Asquith; Ketevi Assamagan; Alan Astbury; Markus Atkinson; Bernard Aubert; Etienne Auge; Kamil Augsten; Mathieu Aurousseau; Giuseppe Avolio; Rachel Maria Avramidou; David Axen; Georges Azuelos; Yuya Azuma; Max Baak; Giuseppe Baccaglioni; Cesare Bacci; Andre Bach; Henri Bachacou; Konstantinos Bachas; Moritz Backes; Malte Backhaus; Elisabeta Badescu; Paolo Bagnaia; Seema Bahinipati; Yu Bai; David Bailey; Travis Bain; John Baines; Oliver Keith Baker; Mark Baker; Sarah Baker; Elzbieta Banas; Piyali Banerjee; Swagato Banerjee; Danilo Banfi; Andrea Michelle Bangert; Vikas Bansal; Hardeep Singh Bansil; Liron Barak; Sergei Baranov; Angela Barbaro Galtieri; Tom Barber; Elisabetta Luigia Barberio; Dario Barberis; Marlon Barbero; Dmitri Bardin; Teresa Barillari; Marcello Barisonzi; Timothy Barklow; Nick Barlow; Bruce Barnett; Michael Barnett; Antonio Baroncelli; Gaetano Barone; Alan Barr; Fernando Barreiro; João Barreiro Guimarães da Costa; Pierre Barrillon; Rainer Bartoldus; Adam Edward Barton; Valeria Bartsch; Austin Basye; Richard Bates; Lucia Batkova; Richard Batley; Andreas Battaglia; Michele Battistin; Florian Bauer; Harinder Singh Bawa; Steven Beale; Tristan Beau; Pierre-Hugues Beauchemin; Roberto Beccherle; Philip Bechtle; Hans Peter Beck; Anne Kathrin Becker; Sebastian Becker; Matthew Beckingham; Karl-Heinz Becks; Andrew Beddall; Ayda Beddall; Sourpouhi Bedikian; Vadim Bednyakov; Christopher Bee; Lars Beemster; Michael Begel; Silvia Behar Harpaz; Prafulla Behera; Michael Beimforde; Camille Belanger-Champagne; Paul Bell; William Bell; Gideon Bella; Lorenzo Bellagamba; Francesco Bellina; Massimiliano Bellomo; Alberto Belloni; Olga Beloborodova; Konstantin Belotskiy; Olga Beltramello; Odette Benary; Driss Benchekroun; Katarina Bendtz; Nektarios Benekos; Yan Benhammou; Eleonora Benhar Noccioli; Jorge-Armando Benitez Garcia; Douglas Benjamin; Mathieu Benoit; James Bensinger; Kamal Benslama; Stan Bentvelsen; David Berge; Elin Bergeaas Kuutmann; Nicolas Berger; Frank Berghaus; Elina Berglund; Jürg Beringer; Pauline Bernat; Ralf Bernhard; Catrin Bernius; Tracey Berry; Claudia Bertella; Antonio Bertin; Federico Bertolucci; Maria Ilaria Besana; Geert-Jan Besjes; Nathalie Besson; Siegfried Bethke; Wahid Bhimji; Riccardo-Maria Bianchi; Michele Bianco; Otmar Biebel; Stephen Paul Bieniek; Katharina Bierwagen; Jed Biesiada; Michela Biglietti; Halina Bilokon; Marcello Bindi; Sebastien Binet; Ahmet Bingul; Cesare Bini; Catherine Biscarat; Bernhard Bittner; Kevin Black; Robert Blair; Jean-Baptiste Blanchard; Georges Blanchot; Tomas Blazek; Ingo Bloch; Craig Blocker; Jacek Blocki; Alain Blondel; Walter Blum; Ulrike Blumenschein; Gerjan Bobbink; Victor Bobrovnikov; Simona Serena Bocchetta; Andrea Bocci; Christopher Richard Boddy

2012-01-01

227

Diffuse x-ray scattering from short-period W/C multilayers at in-plane momentum transfers 0.10-0.17 {angstrom}{sup -1}.  

SciTech Connect

X-ray scattering measurements at 10 keV from multilayers having a period of 24.8 {angstrom} and consisting of 100 W/C bilayers are reported. Specular scans revealed first-order reflectivities in the range 73.5% to 78.0% with bandpasses in the range of 1.5% to 1.7%. Total roughness (or interface grading) values deduced from fitting to the specular data only were in the range 2.5 to 3.0 {angstrom} for the last-to-grow surface of the W layers. Diffuse scattering measurements were made in a geometry that permitted investigation of in-plane momentum transfers up to 0.17 {angstrom}{sup {minus}1}. This is roughly an order of magnitude larger than is possible in conventional rocking scans. Reasonable fitting results were obtained for an in-plane correlation function that has a Fourier transform proportional to exp(-vq{sub y}{sup 2}{vert_bar}z{sub i}-z{sub j}{vert_bar}), where z{sub i}-z{sub j} is the average separation between the i{sup th} and j{sup th} interfaces and q{sub y} is the in-plane momentum transfer.

Headrick, R. L.; Liu, C. L.; Macrander, A. T.

1999-04-20

228

Impacts of upscale heat and momentum transfer by moist Kelvin waves on the Madden-Julian oscillation: a theoretical model study  

NASA Astrophysics Data System (ADS)

The Madden-Julian oscillation (MJO) is observed to interact with moist Kelvin waves. To understand the role of this interaction, a simple scale-interaction model is built, which describes the MJO modulation of moist Kelvin waves and the feedback from moist Kelvin waves through upscale eddy heat and momentum transfer. The backward-tilted moist Kelvin waves produce eddy momentum transfer (EMT) characterized by the lower-tropospheric westerly winds and eddy heat transfer (EHT) that warms the mid-troposphere. The EHT tends to induce the lower-tropospheric easterly winds and low pressure, which is located in front of the "westerly wind burst" induced by the EMT. Adding the eddy forcing to a neutral MJO skeleton model, we show that the EHT provides an instability source for the MJO by warming up the mid-troposphere, and the EMT offers an additional instability source by enhancing the lower-tropospheric westerly winds. The eddy forcing selects eastward propagation for the unstable mode, because it generates positive/negative eddy available potential energy for the eastward/westward modes by changing their thermal and dynamical structures. The present results show that moist Kelvin waves can provide a positive feedback to the MJO only when they are located within (or near) the convective complex (center) of the MJO. The EHT and EMT feedback works positively in the front and rear part of the MJO, respectively. These theoretical results suggest the potential importance of moist Kelvin waves in sustaining the MJO and encourage further observations to document the relationship between moist Kelvin waves and the MJO.

Liu, Fei; Wang, Bin

2013-01-01

229

Transfer-line design uses special procedures. [Large diameter high temperature piping ssystems  

Microsoft Academic Search

Fluid catalytic cracking (FCC) and fluid coking units utilize large-diameter, high-temperature piping systems to transfer fluidized catalyst, coke fines, and hot gases between process vessels. Because of the large diameters and high temperatures, these transfer lines require special design procedures and considerations. The designs are beyond the scope of industry piping standards. A complete stress analysis is required for each

D. Malek; D. Tsairides

1986-01-01

230

Heavy-ion transfer reactions at large internuclear distance  

SciTech Connect

The transfer reaction for the {sup 116}Sn+{sup 60}Ni system has been studied using the PRISMA magnetic spectrometer at different bombarding energies from above to well below the Coulomb barrier. The experiment has been done in inverse kinematics and light target-like ions have been detected with PRISMA placed at very forward angles. Good mass, nuclear charge and kinetic energy resolutions have been achieved. Sufficient statistics has been accumulated to extract angular distributions for different bombarding energies have been extracted and the response function of the spectrometer has been studied to correct for the aberration due to the transport of the ions in PRISMA. The comparison between the present case and the previously measured {sup 96}Zr+{sup 40}Ca system, superfluid and near closed shells nuclei, respectively, should significantly improve our understanding of nucleon-nucleon correlation properties in multinucleon transfer processes.

Montanari, D.; Corradi, L.; Szilner, S.; Pollarolo, G.; Fioretto, E.; Stefanini, A. M.; Farnea, E.; Michelagnoli, C.; Montagnoli, G.; Scarlassara, F.; Ur, C. A.; Courtin, S.; Goasduff, A.; Haas, F.; Mijatovic, T.; Soic, N.; Grebosz, J. [Dipartimento di Fisica e Astronomia, Universita di Padova, I-35131, Padova (Italy) and Istituto Nazionale di Fisica Nucleare, I-35131, Padova (Italy); Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Italy)

2012-10-20

231

Heavy-ion transfer reactions at large internuclear distance  

NASA Astrophysics Data System (ADS)

The transfer reaction for the 116Sn+60Ni system has been studied using the PRISMA magnetic spectrometer at different bombarding energies from above to well below the Coulomb barrier. The experiment has been done in inverse kinematics and light target-like ions have been detected with PRISMA placed at very forward angles. Good mass, nuclear charge and kinetic energy resolutions have been achieved. Sufficient statistics has been accumulated to extract angular distributions for different bombarding energies have been extracted and the response function of the spectrometer has been studied to correct for the aberration due to the transport of the ions in PRISMA. The comparison between the present case and the previously measured 96Zr+40Ca system, superfluid and near closed shells nuclei, respectively, should significantly improve our understanding of nucleon-nucleon correlation properties in multinucleon transfer processes.

Montanari, D.; Corradi, L.; Szilner, S.; Pollarolo, G.; Fioretto, E.; Stefanini, A. M.; Farnea, E.; Michelagnoli, C.; Montagnoli, G.; Scarlassara, F.; Ur, C. A.; Courtin, S.; Goasduff, A.; Haas, F.; Mijatovi?, T.; Soi?, N.; Grebosz, J.

2012-10-01

232

Modeling transport at large scale using upscaled mass transfer models  

Microsoft Academic Search

The usual observation of anomalous (non-Fickian) transport in the field, manifested by peaked concentration profiles with pronounced tailing, has questioned the use of the classical advection-dispersion equation (ADE) to model transport phenomena at the usual computational scale of a numerical model. In this context, we evaluate the use of (multi-rate) mass transfer models as the constitutive transport model for upscaling.

G. Llerar-Meza; D. Fernàndez-Garcia; J. J. Gómez-Hernández

2009-01-01

233

Direct determination of resonance phase shifts of soft x-ray diffraction in thin films by momentum-transfer-sensitive three-wave interference  

SciTech Connect

A method for direct determination of resonance phase shifts in a (001) CdTe/InSb thin-film system is developed using soft x-ray three-wave resonance diffraction. At the (002) Bragg peaks of CdTe and InSb, two inversion-symmetry related three-wave diffractions are systematically identified according to crystal symmetry and the resonance phase shifts versus photon energies are measured without turning the thin film upside down. The momentum-transfer selectivity at (002) reflections facilitates the quantitative determination of the phase shifts near the Cd L{sub 3}, Te L{sub 3}, and Sb L{sub 2} edges.

Wu, H.-H.; Lee, Y.-R.; Chang, Y.-Y.; Chu, C.-H.; Tsai, Y.-W.; Liu, Y.-J.; Chang, S.-L. [Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300 (China); Hsieh, C.-H.; Chou, L.-J. [Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan 300 (China)

2008-09-01

234

The 2H(e, e' p)n reaction at large energy transfers  

NASA Astrophysics Data System (ADS)

At the ELSA accelerator facillity in Bonn, Germany, we have measured the deutron breakup reaction 2H(e, e' p)n at four-momentum transfers around Q2 = -0 .20(GeV/c)2 with an electron beam energy of E0 = 1.6 GeV. The cross section has been determined for energy transfers extending from the quasielastic region to just below the Delta(1232)-resonance, and for proton polar angles up to Thetanp = 145 o in the center-of-momentum system. This angular range represents missing momenta up to pm = 1000 MeV/c. By detecting the scattered protons in two segmented 3 3 m2 scintillator time-of-flight detectors, we have covered a considerable part of the out-of-plane region. The clearly visible variation of the cross section with the proton azimuthal angle fnp has enabled us to extract values for the longitudinal-transverse interference form factor fLT and for a combination of the non-interference form factors fL and fT for proton angles up to Thetanp = 40o in the center-of-momentum system. The experimental results have been compared to the full model calculations by Arenhövel et al. For the major part of our kinematical range the shape of the cross section and of the form factors is reproduced by the model, but some differences remain in the normalization, especially at higher energy transfers. Our results corroborate the conclusions from other recent experiments concerning the importance of subnuclear degrees-of-freedom beyond the quasielastic region, but the discrepancy indicates that the model can still be improved

Willering, Hendrik Willem

2003-04-01

235

Mass-energy radiative transfer and momentum extraction by gravitational wave emission in the collision of two black holes  

SciTech Connect

We examine numerically the head-on collision of two boosted Schwarzschild black holes, in the realm of Robinson-Trautman spacetimes. Characteristic initial data for the system are constructed and the Robinson-Trautman equation is integrated for these data using a numerical code based on the Galerkin-collocation method. The initial data already have a common horizon so that the evolution covers the post-merger regime up to the final configuration, when the gravitational wave emission ceases. In the nonlinear regime gravitational waves are emitted, extracting mass and linear momentum from the system. The final configuration is a boosted Schwarzschild black hole with rest mass larger than the masses of the two individual initial black holes, and with a smaller final boost parameter characterizing the recoil velocity of the remnant. The efficiency {Delta} of the mass-energy extraction by gravitational waves is evaluated. The points ({Delta},y), where y is the (normalized) rest mass of the remnant black hole, satisfy a nonextensive Tsallis distribution with entropic index q{approx_equal}1/2 for y < or approx. 12. Beyond y{approx}12 the experimental points deviate from the distribution function and the efficiency presents an absolute maximum for the case of equally massive individual colliding black holes; the remnant has no recoil in this case. By using the Bondi mass formula we also evaluate the total energy E{sub W} carried out by gravitational waves as well as the radiative corrections to the efficiency. E{sub W} increases monotonically with y and the experimental points (E{sub W},y) also satisfy a nonextensive Tsallis distribution but with q{approx_equal}2/3, up to y{approx}14.2. Beyond this value the experimental points increase faster than the distribution function. For any initial infalling velocity v, the distribution of momentum of the remnant exhibits a maximum at {alpha}{sub 1}={alpha}{sub m{approx_equal}}0.667, where {alpha}{sub 1} is related to the ratio of pre-merger rest masses, and has a one-to-one correspondence with y for fixed v. Two distinct regimes of gravitational wave emission can be characterized according to (i) {alpha}{sub 1}<{alpha}{sub m}: bursts of gravitational bremsstrahlung; (ii) {alpha}{sub 1}>{alpha}{sub m}: quiescent long time emission of gravitational waves. This picture is also sustained by the analysis of the time behavior of the power emitted (dE{sub W}/du).

Aranha, R. F.; Soares, I. Damiao; Tonini, E. V. [Centro Brasileiro de Pesquisas Fisicas/MCT, Rua Dr. Xavier Sigaud, 150, CEP 22290-180, Rio de Janeiro, RJ (Brazil); Centro Federal de Educacao Tecnologica do Espirito Santo, Avenida Vitoria, 1729, CEP 29040-780, Vitoria, ES (Brazil)

2010-05-15

236

Controls on gas transfer velocities in a large river  

EPA Science Inventory

The emission of biogenic gases from large rivers can be an important component of regional greenhouse gas budgets. However, emission rate estimates are often poorly constrained due to uncertainties in the air-water gas exchange rate. We used the floating chamber method to estim...

237

Knowledge transfer in a digital world: Field data acquisition, uncertainty, visualization, and data management  

Microsoft Academic Search

Knowledge transfer has gained political and social momentum in the twenty-first century. The emphasis of this momentum has been on encouraging the transfer of scientific expertise between academia and industry, and on informing the public. The widespread use of the World Wide Web has provided a mechanism for sharing large vol- umes of information, which enables knowl- edge transfer between

C. E. Bond; Z. K. Shipton; R. R. Jones; R. W. H. Butler; A. D. Gibbs

2007-01-01

238

Large-area dual-scale metal transfer by adhesive force  

Microsoft Academic Search

We report a large-area, dual-scale metal transfer method by using a difference in adhesive force. Rigiflex polyurethane acrylate (PUA) molds with engraved nanoscale patterns were used to transfer metal layers (Au or Al) to flexible polyethylene terephthalate (PET) substrate. Transfer process was performed sequentially for the metal layers on ridge and valley regions of the mold, resulting in a dual-scale

Moon Kyu Kwak; Pilnam Kim; Jae Kwan Kim; Chan Ick Park; Hye Sung Cho; Kahp Y. Suh

2008-01-01

239

Mass transfer of volatile organics from large open basins  

SciTech Connect

Controlling the volatilization of organic compounds from treatment works is becoming increasingly important as the definition of industrial categorical standards for air emissions by the EPA draws nearer. In this light, specific volatilization rates of several volatile organic compounds (VOC`s) contained in multimillion gallon retention ({open_quotes}equalization basins{close_quotes}) and settling ({open_quotes}primary clarifier{close_quotes}) basins were measured using a flux chamber technique, a method used by the EPA for emission measurement. In this method, the liquid surface within an enclosing chamber is swept with air at a measured rate and the gas is analyzed. The mass transfer coefficients derived from these VOC vaporization rates were equal for the primary clarifier and the equalization basins. Factors were estimated to correct for the different ambient wind conditions to which these basins are exposed. Also it was determined that the rate of volatilization of VOC`s with low Henry`s law constants may be underestimated by the measurement. This is a result of the gas-phase resistance being dominant under the test conditions and the liquid-phase resistance being dominant under normal ambient conditions, and of the assumption that the liquid-phase resistance remains unchanged under both test and ambient conditions. The particular organics studied were acetone, methyl ethyl ketone, methyl isobutyl ketone, isopropanol, methanol and toluene. 7 refs., 4 figs., 9 tabs.

Sadek, S.E.; Gebel, R. [Ciba-Geigy Corporation, McIntosh, AL (United States); Smith, J.D. [Ciba-Geigy Corporation, Greensboro, NC (United States)] [and others

1996-12-31

240

On the effects of mass and momentum transfer from droplets impacting on steady two-dimensional rimming flow in a horizontal cylinder  

NASA Astrophysics Data System (ADS)

Motivated by applications in aero-engines, steady two-dimensional thin-film flow on the inside of a circular cylinder is studied when the film surface is subject to mass and momentum transfer from impacting droplets. Asymptotic analysis is used systematically to identify distinguished limits that incorporate these transfer effects at leading order and to provide a new mathematical model. Applying both analytical and numerical approaches to the model, a set of stable steady, two-dimensional solutions that fit within the rational framework is determined. A number of these solutions feature steep fronts and associated recirculating pools, which are undesirable in an aeroengine since oil may be stripped away from the steep fronts when there is a core flow external to the film, and recirculation may lead to oil degradation. The model, however, provides a means of investigating whether the formation of the steep fronts on the film surface and of internal recirculation pools can be delayed, or inhibited altogether, by designing jets to deliver prescribed distributions of oil droplets or by the judicious siting of oil sinks. Moreover, by studying pathlines, oil-residence times can be predicted and systems optimized.

Williams, J.; Hibberd, S.; Power, H.; Riley, D. S.

2012-05-01

241

Rotational dependence of the proton-transfer reaction HBr++CO2-->HOCO++Br. I. Energy versus angular momentum effects  

NASA Astrophysics Data System (ADS)

Cross sections for the endothermic proton-transfer reactions of rotationally state-selected HBr+ and DBr+ ions with CO2 were measured in a guided ion beam apparatus in order to determine the influence of rotational excitation and collision energy in the center of mass (c.m.) system on the cross section. Ab initio calculations were performed to obtain energetic information about reactants, intermediates, and products. In the experiment HBr+ and DBr+ ions were prepared with the same mean rotational quantum number but different mean rotational energies as the rotational constants differ by about a factor of two. The mean rotational energy was varied from 1.4 to 66.3 meV for HBr+ and from 0.7 to 43.0 meV for DBr+. Collision energies (Ec.m.) ranged from 0.32 to 1.00 eV. Under all conditions considered, an increase in the rotational excitation leads to a decrease in the cross section for both reactions. However, the effect is more pronounced for the higher collision energies. For Ec.m.=1.00 and 0.85 eV; a comparison between the results for HBr+ and DBr+ indicates that the cross section is dominated by effects of rotational energy rather than angular momentum. For lower collision energies the cross sections for the deuteron transfer and the proton transfer are in best agreement if not compared for the same c.m. collision energy but for the same value of the difference between the collision energy and the reaction enthalpy.

Paetow, Lisa; Unger, Franziska; Beichel, Witali; Frenking, Gernot; Weitzel, Karl-Michael

2010-05-01

242

Experimental study of nonlinear interaction of plasma flow with charged thin current sheets: 2. Hall dynamics, mass and momentum transfer  

NASA Astrophysics Data System (ADS)

Proceeding with the analysis of Amata et al. (2005), we suggest that the general feature for the local transport at a thin magnetopause (MP) consists of the penetration of ions from the magnetosheath with gyroradius larger than the MP width, and that, in crossing it, the transverse potential difference at the thin current sheet (TCS) is acquired by these ions, providing a field-particle energy exchange without parallel electric fields. It is suggested that a part of the surface charge is self-consistently produced by deflection of ions in the course of inertial drift in the non-uniform electric field at MP. Consideration of the partial moments of ions with different energies demonstrates that the protons having gyroradii of roughly the same size or larger than the MP width carry fluxes normal to MP that are about 20% of the total flow in the plasma jet under MP. This is close to the excess of the ion transverse velocity over the cross-field drift speed in the plasma flow just inside MP (Amata et al., 2005), which conforms to the contribution of the finite-gyroradius inflow across MP. A linkage through the TCS between different plasmas results from the momentum conservation of the higher-energy ions. If the finite-gyroradius penetration occurs along the MP over ~1.5 RE from the observation site, then it can completely account for the formation of the jet under the MP. To provide the downstream acceleration of the flow near the MP via the cross-field drift, the weak magnetic field is suggested to rotate from its nearly parallel direction to the unperturbed flow toward being almost perpendicular to the accelerated flow near the MP. We discuss a deceleration of the higher-energy ions in the MP normal direction due to the interaction with finite-scale electric field bursts in the magnetosheath flow frame, equivalent to collisions, providing a charge separation. These effective collisions, with a nonlinear frequency proxy of the order of the proton cyclotron one, in extended turbulent zones are a promising alternative in place of the usual parallel electric fields invoked in the macro-reconnection scenarios. Further cascading towards electron scales is supposed to be due to unstable parallel electron currents, which neutralize the potential differences, either resulted from the ion- burst interactions or from the inertial drift. The complicated MP shape suggests its systematic velocity departure from the local normal towards the average one, inferring domination for the MP movement of the non-local processes over the small-scale local ones. The measured Poynting vector indicates energy transmission from the MP into the upstream region with the waves triggering impulsive downstream flows, providing an input into the local flow balance and the outward movement of the MP. Equating the transverse electric field inside the MP TCS by the Hall term in the Ohm's law implies a separation of the different plasmas primarily by the Hall current, driven by the respective part of the TCS surface charge. The Hall dynamics of TCS can operate either without or as a part of a macro-reconnection with the magnetic field annihilation.

Savin, S.; Amata, E.; Andre, M.; Dunlop, M.; Khotyaintsev, Y.; Decreau, P. M. E.; Rauch, J. L.; Trotignon, J. G.; Buechner, J.; Nikutowski, B.; Blecki, J.; Skalsky, A.; Romanov, S.; Zelenyi, L.; Buckley, A. M.; Carozzi, T. D.; Gough, M. P.; Song, P.; Reme, H.; Volosevich, A.; Alleyne, H.; Panov, E.

2006-08-01

243

High-energy hadron spin-flip amplitude at small momentum transfer and new A N data from RHIC  

NASA Astrophysics Data System (ADS)

In the case of elastic high-energy hadron-hadron scattering, the impact of the large-distance contributions on the behaviour of the slopes of the spin-non-flip and of the spin-flip amplitudes is analysed. It is shown that the long tail of the hadronic potential in impact parameter space leads to a value of the slope of the reduced spin-flip amplitude larger than that of the spin-non-flip amplitude. This effect is taken into account in the calculation of the analysing power in proton-nucleus reactions at high energies. It is shown that the preliminary measurement of A N for p 12C obtained by the E950 Collaboration indeed favours a spin-flip amplitude with a large slope. Predictions for A N at p_L = 250 GeV/c are given.

Cudell, J.-R.; Predazzi, E.; Selyugin, O. V.

2004-09-01

244

Modeling of Combustion as well as Heat, Mass, and Momentum Transfer During Thermal Spraying by HVOF and HVSFS  

Microsoft Academic Search

In thermal spray technologies and coating industries, increasing research and development efforts have been made in recent\\u000a years toward submicron and nanostructured layers on different materials and components, promising large potentials in functional\\u000a and structural coating properties. These potentials have been encouraging researchers to aim for an improved understanding\\u000a and optimization of the high-velocity oxide fuel (HVOF) system to be

Esther Dongmo; Rainer Gadow; Andreas Killinger; Martin Wenzelburger

2009-01-01

245

E2 strengths and transition radii difference of one-phonon 2+ states of 92Zr from electron scattering at low momentum transfer  

NASA Astrophysics Data System (ADS)

Background: Mixed-symmetry 2+ states in vibrational nuclei are characterized by a sign change between dominant proton and neutron valence-shell components with respect to the fully symmetric 2+ state. The sign can be measured by a decomposition of proton and neutron transition radii with a combination of inelastic electron and hadron scattering [C. Walz , Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.106.062501 106, 062501 (2011)]. For the case of 92Zr, a difference could be experimentally established for the neutron components, while about equal proton transition radii were indicated by the data.Purpose: Determination of the ground-state (g.s.) transition strength of the mixed-symmetry 22+ state and verification of the expected vanishing of the proton transition radii difference between the one-phonon 2+ states in 92Zr.Method: Differential cross sections for the excitation of one-phonon 2+ and 3- states in 92Zr have been measured with the (e,e') reaction at the S-DALINAC in a momentum transfer range q?0.3-0.6 fm-1.Results: Transition strengths B(E2;21+?01+)=6.18(23), B(E2;22+?01+)=3.31(10), and B(E3;31-?01+)=18.4(1.1) Weisskopf units are determined from a comparison of the experimental cross sections to quasiparticle-phonon model (QPM) calculations. It is shown that a model-independent plane wave Born approximation (PWBA) analysis can fix the ratio of B(E2) transition strengths to the 21,2+ states with a precision of about 1%. The method furthermore allows to extract their proton transition radii difference. With the present data ?R=-0.12(51) fm is obtained.Conclusions: Electron scattering at low momentum transfers can provide information on transition radii differences of one-phonon 2+ states even in heavy nuclei. Proton transition radii for the 21,2+ states in 92Zr are found to be identical within uncertainties. The g.s. transition probability for the mixed-symmetry state can be determined with high precision limited only by the available experimental information on the B(E2;21+?01+) value.

Obeid, A. Scheikh; Burda, O.; Chernykh, M.; Krugmann, A.; von Neumann-Cosel, P.; Pietralla, N.; Poltoratska, I.; Ponomarev, V. Yu.; Walz, C.

2013-01-01

246

Momentum kicks due to quantum localization  

Microsoft Academic Search

The momentum changes caused by position measurements are a central feature of wave-particle duality. Here we investigate two cases - localization by a single slit, and which-way detection in the double-slit interference experiment - and examine in detail the associated momentum changes. Particular attention is given to the transfer of momentum between particle and detector, and the recoil of the

A. J. Short

2001-01-01

247

Silver halide masters for transfer into large format dichromated gelatin (DCG) holograms  

Microsoft Academic Search

Techniques used to create several large format, 50 X 60 cm, silver halide masters for transfer into a large format, 45 X 54 cm, DCG hologram are discussed. The subject, a fossilized dinosaur egg, is one of the largest such artifacts ever found. In order to present all facets of the subject, the outer egg shell, the articulated embryo bones

Fred D. Unterseher; August Muth; Rebecca E. Deem

1998-01-01

248

Search for diphoton events with large missing transverse momentum in 7 TeV proton-proton collision data with the ATLAS detector  

NASA Astrophysics Data System (ADS)

A search for diphoton events with large missing transverse momentum has been performed using proton-proton collision data at s=7 TeV recorded with the ATLAS detector, corresponding to an integrated luminosity of 4.8 fb. No excess of events was observed above the Standard Model prediction and model-dependent 95% confidence level exclusion limits are set. In the context of a generalised model of gauge-mediated supersymmetry breaking with a bino-like lightest neutralino of mass above 50 GeV, gluinos (squarks) below 1.07 TeV (0.87 TeV) are excluded, while a breaking scale ? below 196 TeV is excluded for a minimal model of gauge-mediated supersymmetry breaking. For a specific model with one universal extra dimension, compactification scales 1/R<1.40 TeV are excluded. These limits provide the most stringent tests of these models to date.

ATLAS Collaboration Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bittner, B.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Bradmiller-feld, J.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.

2012-12-01

249

Generation of structured beams in large-Fresnel number degenerate cavities and beam transformation with orbital angular momentum  

Microsoft Academic Search

We employ a large-Fresnel-number laser system to demonstrate the three-dimensional optical coherent waves localized on Lissajous and trochoidal parametric surfaces with Lissajous and trochoidal transverse patterns in degenerate cavities. The coherent structured beams are verified to be composed of degenerate Hermite-Gaussian and Laguerre-Gaussian modes with different longitudinal indices resulted from longitudinal-transverse coupling. As well known, the Hermite- Gaussian modes can

T. H. Lu; Y. C. Lin; Y. F. Chen; K. F. Huang

2010-01-01

250

Development of a large commercial camel embryo transfer program: 20 years of scientific research.  

PubMed

Embryo transfer in camels was initiated to respond to demand from the camel industry particularly in the United Arab Emirates since 1990. This paper reviews the research performed in critical areas of reproductive physiology and reproductive function evaluation that constitute a pre-requisite for a successful embryo transfer program. A description of donor and recipient management as well as a retrospective evaluation of calf production in the embryo transfer program at Sweihan, UAE is provided. The program utilized two management systems for donors, with and without ovarian superstimulation. Non-stimulated donors are flushed every 14-15 days with a mean embryo production per year per female of 8.5±3.1 (mean±SEM). Response to gonadotropin stimulation is extremely variable. FSH doses and frequency of administration is often adjusted to a specific female. In the period of 1990-2010, 11,477 embryos were transferred to recipients. Transfers from 1990 to 2009 (n=10,600) resulted in 2858 weaned calves, representing an overall efficiency (% weaned calves/transfer) of 27%. Pregnancy rates at 60 days post transfer varied from 19 to 44%. Pregnancy length following transfer is extremely variable. A major challenge in a large embryo transfer program is finding good quality recipients. Causes of pregnancy and neonatal losses are under study. PMID:23153626

Anouassi, Abdelhaq; Tibary, Ahmed

2012-10-24

251

Measurements of momentum transfer coefficients for H{sub 2}, N{sub 2}, CO and CO{sub 2} incident upon spacecraft surfaces  

SciTech Connect

Measurements of momentum transfer coefficients were made for gas-surface interactions between the Space Shuttle reaction control jet plume gases and the solar panel array materials to be used on the International Space Station. Actual conditions were simulated using a supersonic nozzle source to produce beams of the gases with approximately the same average velocities as the gases have in the Shuttle plumes. Samples of the actual solar panel materials were mounted on a torsion balance that was used to measure the force exerted on the surfaces by the molecular beams. Measurements were made with H{sub 2}, N{sub 2}, CO, and CO{sub 2} incident upon the solar array material, Kapton, SiO{sub 2}-coated Kapton, and Z93-coated Al. The measurements showed that molecules scatter from the surfaces more specularly as the angle of incidence increases and that scattering behavior has a strong dependence upon both the incident gas and velocity. These results show that for some technical surfaces the simple assumption of diffuse scattering with complete thermal accommodation is entirely inadequate. It is clear that additional measurements are required to produce models that more accurately describe the gas-surface interactions encountered in rarefied flow regimes.

Cook, S.R.; Hoffbauer, M.A.

1997-07-16

252

Anomalous momentum and energy transfer rates for electrostatic ion-cyclotron turbulence in downward auroral-current regions of the Earth's magnetosphere. III  

SciTech Connect

Recently, a new multimoment fluid theory was developed for inhomogeneous, nonuniformly magnetized plasma in the guiding-center and gyrotropic approximation that includes the effect of electrostatic, turbulent, wave-particle interactions (see Jasperse et al. [Phys. Plasmas 13, 072903 (2006); ibid.13, 112902 (2006)]). In the present paper, which is intended as a sequel, it is concluded from FAST satellite data that the electrostatic ion-cyclotron turbulence that appears is due to the operation of an electron, bump-on-tail-driven ion-cyclotron instability for downward currents in the long-range potential region of the Earth's magnetosphere. Approximate closed-form expressions for the anomalous momentum and energy transfer rates for the ion-cyclotron turbulence are obtained. The turbulent, inhomogeneous, nonuniformly magnetized, multimoment fluid theory given above, in the limit of a turbulent, homogeneous, uniformly magnetized, quasisteady plasma, yields the well-known formula for the anomalous resistivity given by Gary and Paul [Phys. Rev. Lett. 26, 1097 (1971)] and Tange and Ichimaru [J. Phys. Soc. Jpn. 36, 1437 (1974)].

Jasperse, John R.; Basu, Bamandas [Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, Massachusetts 01731 (United States); Lund, Eric J. [Space Science Center, University of New Hampshire, Durham, New Hampshire 03824 (United States); Grossbard, Neil [Institute for Scientific Research, Boston College, Chestnut Hill, Massachusetts 02467 (United States)

2010-06-15

253

Momentum-transfer, differential and spin-exchange cross sections in the elastic scattering of low-energy electrons by heavy alkali-metal atoms.  

NASA Astrophysics Data System (ADS)

Based on the relativistic Dirac R-matrix method, we analyze various angle-dependent cross sections for electron scattering by Rb, Cs and Fr targets at energies below 3 eV. We show our angle-dependent and total spin-exchange cross sections for scattering of non-polarized (or polarized) electrons by polarized (or non-polarized) Rb, Cs and Fr targets, and we compare them with available experimental data (B. Jaduszliwer, N.D. Bhaskar, and B. Bederson Phys.Rev. A 14), 162 (1976).. The influence of relativistic effects is discussed. From the energy and angular dependence analysis of the differential cross section, we obtain clear evidence of the Cs^-(^3F^o) shape resonance at 1.528 eV, in excellent agreement with accurate experiments (W. Gehenn and E. Reichert, J.Phys. B 10), 3105 (1977).. We compare our electron momentum-transfer cross section with available data obtained in swarm experiments for Rb (Y. Nakamura, Trans. IEE of Japan 102-A), 23 (1982). and Cs (H.T. Saelee and J. Lucas, J.Phys. D 12), 1275 (1979)..

Bahrim, Cristian; Thumm, Uwe; Fabrikant, Ilya I.

2000-06-01

254

Plasma momentum meter for momentum flux measurements  

DOEpatents

Invention comprises an instrument in which momentum flux onto a biasable target plate is transferred via a suspended quartz tube onto a sensitive force transducer--a capacitance-type pressure gauge. The transducer is protected from thermal damage, arcing and sputtering, and materials used in the target and pendulum are electrically insulating, rigid even at elevated temperatures, and have low thermal conductivity. The instrument enables measurement of small forces (10.sup.-5 to 10.sup.3 N) accompanied by high heat fluxes which are transmitted by energetic particles with 10's of eV of kinetic energy in a intense magnetic field and pulsed plasma environment.

Zonca, Fulvio (Rome, IT); Cohen, Samuel A. (Hopewell, NJ); Bennett, Timothy (Princeton, NJ); Timberlake, John R. (Allentown, NJ)

1993-01-01

255

Plasma momentum meter for momentum flux measurements  

DOEpatents

Invention comprises an instrument in which momentum flux onto a biasable target plate is transferred via a suspended quartz tube onto a sensitive force transducer - a capacitance-type pressure gauge. The transducer is protected from thermal damage, arcing and sputtering, and materials used in the target and pendulum are electrically insulating, rigid even at elevated temperatures, and have low thermal conductivity. The instrument enables measurement of small forces (10[sup [minus]5] to 10[sup 3] N) accompanied by high heat fluxes which are transmitted by energetic particles with 10's of eV of kinetic energy in an intense magnetic field and pulsed plasma environment.

Zonca, F.; Cohen, S.A.; Bennett, T.; Timberlake, J.R.

1991-01-01

256

Plasma momentum meter for momentum flux measurements  

DOEpatents

Invention comprises an instrument in which momentum flux onto a biasable target plate is transferred via a suspended quartz tube onto a sensitive force transducer - a capacitance-type pressure gauge. The transducer is protected from thermal damage, arcing and sputtering, and materials used in the target and pendulum are electrically insulating, rigid even at elevated temperatures, and have low thermal conductivity. The instrument enables measurement of small forces (10{sup {minus}5} to 10{sup 3} N) accompanied by high heat fluxes which are transmitted by energetic particles with 10`s of eV of kinetic energy in an intense magnetic field and pulsed plasma environment.

Zonca, F.; Cohen, S.A.; Bennett, T.; Timberlake, J.R.

1991-12-31

257

Plasma momentum meter for momentum flux measurements  

SciTech Connect

Invention comprises an instrument in which momentum flux onto a biasable target plate is transferred via a suspended quartz tube onto a sensitive force transducer--a capacitance-type pressure gauge. The transducer is protected from thermal damage, arcing and sputtering, and materials used in the target and pendulum are electrically insulating, rigid even at elevated temperatures, and have low thermal conductivity. The instrument enables measurement of small forces (10.sup.-5 to 10.sup.3 N) accompanied by high heat fluxes which are transmitted by energetic particles with 10's of eV of kinetic energy in a intense magnetic field and pulsed plasma environment.

Zonca, Fulvio (Rome, IT); Cohen, Samuel A. (Hopewell, NJ); Bennett, Timothy (Princeton, NJ); Timberlake, John R. (Allentown, NJ)

1993-01-01

258

Rational analysis of mass, momentum, and heat transfer phenomena in liquid storage tanks under realistic operating conditions: 1. Basic formulation  

SciTech Connect

This paper presents a computer code that analyses the performance of storage tanks using water as the working fluid. The new aspects of the authors work include the following items: (a) the transient Navier-Stokes equations are expressed in two-dimensional Cartesian and cylindrical coordinates, under the assumption of the Boussinesq approximation, (b) the effective viscosity and thermal diffusivity are evaluated by using a simplified form of the Deardorff turbulence model, (c) the energy equation is solved over a domain which includes the tank and a large portion of the surrounding soil, (d) some properly defined source terms have been introduced in the governing equations to describe inlet/outlet devices inside the tank, and localized friction losses, and (e) the boundary conditions are time-dependent to correctly describe the daily heat exchanges between tank, solar collectors and heat pumps for space conditioning. The Finite Differences (FD) technique and an improved formulation of the Marker and Cell (MAC) method are used to solve the conservation equations. Comparisons with literature studies indicate discrepancies between 0.02 and 0.5%. The results of several tests simulating realistic operating conditions will be shown in the second part of the paper.

Parrini, F.; Vitale, S.; Alabiso, M. (ENEL-Italian National Electricity Board-CRTN, Milan (Italy)); Castellano, L. (MATEC S.r.l., Milan (Italy))

1992-08-01

259

Preferential enrichment of large-sized very low density lipoprotein populations with transferred cholesteryl esters  

SciTech Connect

The effect of lipid transfer proteins on the exchange and transfer of cholesteryl esters from rat plasma HDL2 to human very low (VLDL) and low density (LDL) lipoprotein populations was studied. The use of a combination of radiochemical and chemical methods allowed separate assessment of (/sup 3/H)cholesteryl ester exchange and of cholesteryl ester transfer. VLDL-I was the preferred acceptor for transferred cholesteryl esters, followed by VLDL-II and VLDL-III. LDL did not acquire cholesteryl esters. The contribution of exchange of (/sup 3/H)cholesteryl esters to total transfer was highest for LDL and decreased in reverse order along the VLDL density range. Inactivation of lecithin: cholesterol acyltransferase (LCAT) and heating the HDL2 for 60 min at 56 degrees C accelerated transfer and exchange of (/sup 3/H)cholesteryl esters. Addition of lipid transfer proteins increased cholesterol esterification in all systems. The data demonstrate that large-sized, triglyceride-rich VLDL particles are preferred acceptors for transferred cholesteryl esters. It is suggested that enrichment of very low density lipoproteins with cholesteryl esters reflects the triglyceride content of the particles.

Eisenberg, S.

1985-04-01

260

Silver halide masters for transfer into large format dichromated gelatin (DCG) holograms  

NASA Astrophysics Data System (ADS)

Techniques used to create several large format, 50 X 60 cm, silver halide masters for transfer into a large format, 45 X 54 cm, DCG hologram are discussed. The subject, a fossilized dinosaur egg, is one of the largest such artifacts ever found. In order to present all facets of the subject, the outer egg shell, the articulated embryo bones and a model of an artist's concept of the embryo inside the shell, several masters were produced to create in the end a double exposure, multichannel transfer image. An emphasis is placed on a practical approach to the production of the holograms.

Unterseher, Fred D.; Muth, August; Deem, Rebecca E.

1998-02-01

261

Nucleon transfer at large internuclear distances in S-32 and Mo-92,96,100  

NASA Astrophysics Data System (ADS)

Nucleon transfer probability at large internuclear distances has been measured for the systems 32S + 92,96,100Mo in two energy regimes: below and above the Coulomb barrier. For the below-barrier measurements, target-like reaction products were detected in the focal plane of a recoil mass spectrometer. For the above- barrier measurements, projectile-like reaction products were detected in the focal plane of an Enge split-pole spectrograph. In both energy regimes, the transfer probabilities show exponential fall-off with increasing distance of closest approach, consistent with a tunneling picture of nucleon transfer. The measured decay constants for the below-barrier transfer probability agree with binding-energy derived decay constants predicted on the basis of the semi-classical model of nucleon transfer. However, at above-barrier energies, the measured decay constants are smaller than the predicted values. The observed enhancements of the transfer probability at large internuclear distances for above-barrier energies are discussed in terms of quantal diffraction.

Herrick, Diane Marie

1997-10-01

262

Large Quantum Probability Backflow and the Azimuthal Angle-Angular Momentum Uncertainty Relation for an Electron in a Constant Magnetic Field  

ERIC Educational Resources Information Center

|In this paper we demonstrate a surprising aspect of quantum mechanics that is accessible to an undergraduate student. We discuss probability backflow for an electron in a constant magnetic field. It is shown that even for a wavepacket composed entirely of states with negative angular momentum the effective angular momentum can take on positive…

Strange, P.

2012-01-01

263

Biolistic transfer of large DNA fragments to tobacco cells using YACs retrofitted for plant transformation  

Microsoft Academic Search

To determine whether large DNA molecules could be transferred and integrated intact into the genome of plant cells, we bombarded tobacco suspension cells with yeast DNA containing artificial chromosomes (YACs) having sizes of 80, 150, 210, or 550 kilobases (kb). Plant selectable markers were retrofitted on both YAC arms so that recovery of each arm in transgenic calli could be

Jeffrey Mullen; Gerhard Adam; Alan Blowers; Elizabeth Earle

1998-01-01

264

Transfer-Free Batch Fabrication of Large-Area Suspended Graphene Membranes.  

National Technical Information Service (NTIS)

We demonstrate a process for batch production of large-area (100- 3000 sq microns) patterned freestanding graphene membranes on Cu scaffolds using chemical vapor deposition (CVD)-grown graphene. This technique avoids the use of silicon and transfers of gr...

B. Aleman N. Alem S. Aloni V. Altoe W. Regan

2010-01-01

265

Large HTGR steam generator design verification and support programs. Heat transfer, fluid flow, and stability  

Microsoft Academic Search

The design of the steam generators for the large High-Temperature Gas-; Cooled Reactor (HTGR) is based on significant amounts of experience and data ; obtained throughout the world. Gulf General Atomic and Foster Wheeler believe ; that the available data and experience, in conjunction with the testing programs ; discussed, provide a firm basis for the heat transfer and fluid

Schultz

1973-01-01

266

Experience Transfer for the Configuration Tuning in Large-Scale Computing Systems  

Microsoft Academic Search

This paper proposes a new strategy, the experience transfer, to facilitate the management of large-scale computing systems. It deals with the utilization of management experiences in one system (or previous systems) to benefit the same management task in other systems (or current systems). We use the system configuration tuning as a case application to demonstrate all procedures involved in the

Haifeng Chen; Wenxuan Zhang; Guofei Jiang

2011-01-01

267

Feynman's angular momentum paradox revisited  

NASA Astrophysics Data System (ADS)

We reexamine Feynman's angular momentum paradox, in which a cylinder of charge around a current carrying solenoid is set in rotational motion when the current is turned off (due to the induced electric field caused by the change in magnetic flux), apparently violating conservation of angular momentum. The standard explanation of the resolution of this paradox is that, when the electric current in the solenoid is on, the combination of the magnetic field from the current and the electric field from the charges results in non-zero angular momentum which is stored in the electromagnetic fields in the vicinity of the solenoid. This angular momentum is transferred to the charged cylinder when the current is turned off. However, we show that for certain geometries of the solenoid and position of the charges, the angular momentum in the vicinity of the solenoid is in fact zero even when the solenoid carries electric current and hence magnetic field is present in the vicinity of the solenoid. We show that angular momentum is in fact still conserved, because the electromagnetic fields which radiate outwards from the solenoid after the current is turned off carry angular momentum which is opposite to the direction of the angular momentum imparted to the charge on the cylinder.

Hu, Ben Yu-Kuang; Loeber, Brian

2012-04-01

268

Search for diphoton events with large missing transverse momentum in 1 fb of 7 TeV proton-proton collision data with the ATLAS detector  

NASA Astrophysics Data System (ADS)

A search for diphoton events with large missing transverse momentum has been performed using 1.07 fb of proton-proton collision data at s=7 TeV recorded with the ATLAS detector. No excess of events was observed above the Standard Model prediction and 95% Confidence Level (CL) upper limits are set on the production cross section for new physics. The limits depend on each model parameter space and vary as follows: ?<(22-129) fb in the context of a generalised model of gauge-mediated supersymmetry breaking (GGM) with a bino-like lightest neutralino, ?<(27-91) fb in the context of a minimal model of gauge-mediated supersymmetry breaking (SPS8), and ?<(15-27) fb in the context of a specific model with one universal extra dimension (UED). A 95% CL lower limit of 805 GeV, for bino masses above 50 GeV, is set on the GGM gluino mass. Lower limits of 145 TeV and 1.23 TeV are set on the SPS8 breaking scale ? and on the UED compactification scale 1/R, respectively. These limits provide the most stringent tests of these models to date.

ATLAS Collaboration Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Aliyev, M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alviggi, M. G.; Amako, K.; Amaral, P.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amorós, G.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Archambault, J. P.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Astvatsatourov, A.; Atoian, G.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Austin, N.; Avolio, G.; Avramidou, R.; Axen, D.; Ay, C.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Bachy, G.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barashkou, A.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, D.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Battistoni, G.; Bauer, F.; Bawa, H. S.; Beare, B.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Ben Ami, S.; Benary, O.; Benchekroun, D.; Benchouk, C.; Bendel, M.; Benekos, N.; Benhammou, Y.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernardet, K.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertin, A.; Bertinelli, F.; Bertolucci, F.; Besana, M. I.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Böser, S.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bona, M.; Bondarenko, V. G.; Bondioli, M.; Boonekamp, M.; Boorman, G.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borroni, S.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Braem, A.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brenner, R.; Bressler, S.; Breton, D.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodbeck, T. J.; Brodet, E.; Broggi, F.; Bromberg, C.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Buanes, T.; Bucci, F.; Buchanan, J.

2012-04-01

269

High transverse momentum triggered correlations over a large pseudorapidity acceptance in Au + Au collisions at square root(s(NN)) = 200 GeV.  

PubMed

A measurement of two-particle correlations with a high transverse momentum trigger particle (p(T)(trig) > 2.5 GeV/c) is presented for Au+Au collisions at square root(s(NN)) = 200 GeV over the uniquely broad longitudinal acceptance of the PHOBOS detector (-4 < Delta eta < 2). A broadening of the away-side azimuthal correlation compared to elementary collisions is observed at all Delta eta. As in p+p collisions, the near side is characterized by a peak of correlated partners at small angle relative to the trigger particle. However, in central Au+Au collisions an additional correlation extended in Delta eta and known as the "ridge" is found to reach at least |Delta eta| approximately = 4. The ridge yield is largely independent of Delta eta over the measured range, and it decreases towards more peripheral collisions. For the chosen (p(T)(trig) cut, the ridge yield is consistent with zero for events with less than roughly 100 participating nucleons. PMID:20366815

Alver, B; Back, B B; Baker, M D; Ballintijn, M; Barton, D S; Betts, R R; Bickley, A A; Bindel, R; Busza, W; Carroll, A; Chai, Z; Chetluru, V; Decowski, M P; García, E; Gburek, T; George, N; Gulbrandsen, K; Halliwell, C; Hamblen, J; Hauer, M; Henderson, C; Hofman, D J; Hollis, R S; Ho?y?ski, R; Holzman, B; Iordanova, A; Johnson, E; Kane, J L; Khan, N; Kulinich, P; Kuo, C M; Li, W; Lin, W T; Loizides, C; Manly, S; Mignerey, A C; Nouicer, R; Olszewski, A; Pak, R; Reed, C; Roland, C; Roland, G; Sagerer, J; Seals, H; Sedykh, I; Smith, C E; Stankiewicz, M A; Steinberg, P; Stephans, G S F; Sukhanov, A; Tonjes, M B; Trzupek, A; Vale, C; van Nieuwenhuizen, G J; Vaurynovich, S S; Verdier, R; Veres, G I; Walters, P; Wenger, E; Wolfs, F L H; Wosiek, B; Wo?niak, K; Wys?ouch, B

2010-02-11

270

Transfer of large-area graphene films for high-performance transparent conductive electrodes.  

PubMed

Graphene, a two-dimensional monolayer of sp(2)-bonded carbon atoms, has been attracting great interest due to its unique transport properties. One of the promising applications of graphene is as a transparent conductive electrode owing to its high optical transmittance and conductivity. In this paper, we report on an improved transfer process of large-area graphene grown on Cu foils by chemical vapor deposition. The transferred graphene films have high electrical conductivity and high optical transmittance that make them suitable for transparent conductive electrode applications. The improved transfer processes will also be of great value for the fabrication of electronic devices such as field effect transistor and bilayer pseudospin field effect transistor devices. PMID:19845330

Li, Xuesong; Zhu, Yanwu; Cai, Weiwei; Borysiak, Mark; Han, Boyang; Chen, David; Piner, Richard D; Colombo, Luigi; Ruoff, Rodney S

2009-12-01

271

Plasma momentum meter for momentum flux measurements  

DOEpatents

An apparatus is described for measuring momentum flux from an intense plasma stream, comprising: refractory target means oriented normal to the flow of said plasma stream for bombardment by said plasma stream where said bombardment by said plasma stream applies a pressure to said target means, pendulum means for communicating a translational displacement of said target to a force transducer where said translational displacement of said target is transferred to said force transducer by an elongated member coupled to said target, where said member is suspended by a pendulum configuration means and where said force transducer is responsive to said translational displacement of said member, and force transducer means for outputting a signal representing pressure data corresponding to said displacement.

Zonca, F.; Cohen, S.A.; Bennett, T.; Timberlake, J.R.

1993-08-24

272

Data transfer over the wide area network with a large round trip time  

NASA Astrophysics Data System (ADS)

A Tier-2 regional center is running at the University of Tokyo in Japan. This center receives a large amount of data of the ATLAS experiment from the Tier-1 center in France. Although the link between the two centers has 10Gbps bandwidth, it is not a dedicated link but is shared with other traffic, and the round trip time is 290ms. It is not easy to exploit the available bandwidth for such a link, so-called long fat network. We performed data transfer tests by using GridFTP in various combinations of the parameters, such as the number of parallel streams and the TCP window size. In addition, we have gained experience of the actual data transfer in our production system where the Disk Pool Manager (DPM) is used as the Storage Element and the data transfer is controlled by the File Transfer Service (FTS). We report results of the tests and the daily activity, and discuss the improvement of the data transfer throughput.

Matsunaga, H.; Isobe, T.; Mashimo, T.; Sakamoto, H.; Ueda, I.

2010-04-01

273

Containment condensing heat transfer. [PWR; BWR  

SciTech Connect

This report presents a mechanistic heat-transfer model that is valid for large scale containment heat sinks. The model development is based on the determination that the condensation is controlled by mass diffusion through the vapor-air boundary layer, and the application of the classic Reynolds' analogy to formulate expressions for the transfer of heat and mass based on hydrodynamic measurements of the momentum transfer. As a result, the analysis depends on the quantification of the shear stress (momentum transfer) at the interface between the condensate film and the vapor-air boundary layer. In addition, the currently used Tagami and Uchida test observations and their range of applicability are explained.

Gido, R.G.; Koestel, A.

1983-01-01

274

Perpendicular momentum injection by lower hybrid wave in a tokamak  

NASA Astrophysics Data System (ADS)

The injection of lower hybrid (LH) waves for current drive into a tokamak affects the profile of intrinsic rotation. In this paper, the momentum deposition by the LH wave on the electrons is studied. Due to the increase in the poloidal momentum of the wave as it propagates into the tokamak, the parallel momentum of the wave increases considerably. The change in the perpendicular momentum of the wave is such that the toroidal angular momentum of the wave is conserved. If the perpendicular momentum transfer via electron Landau damping is ignored, the transfer of the toroidal angular momentum to the plasma will be larger than the injected toroidal angular momentum. A proper quasilinear treatment proves that both perpendicular and parallel momentum are transferred to the electrons. The toroidal angular momentum of the electrons is then transferred to the ions via different mechanisms for the parallel and perpendicular momentum. The perpendicular momentum is transferred to ions through an outward radial electron pinch, while the parallel momentum is transferred through collisions.

Lee, Jungpyo; Parra, Felix I.; Parker, Ron R.; Bonoli, Paul T.

2012-12-01

275

Models for Relativistic Coulomb Sum Rules:Expansions in Moments of the Nuclear Momentum Density  

SciTech Connect

Relativistic Coulomb sum rules for quasielastic electron scattering from nuclei are developed using a class of relativistic models for the nuclear ground-state momentum distribution. Approximate sum rules at constant 3- or 4-momentum transfer are expressed as expansions in moments of the momentum distribution. New sum-rule functions are derived which, even for very large values of energy and momentum where relativistic effects become dominant, approach simple asymptotic values; in doing so they approximately retain the flavor of the nonrelativistic Coulomb sum rule which approaches Z. Specific ways of achieving an optimum separation of effects relating to the electromagnetic response of a single nucleon and of a many-body system of structureless particles are discussed, including a study of sensitivities to alternative parameterizations of GEn. Comparisons of results using different momentum distributions for the case of 16O are presented.

Donnelly, T. W.; Kronenberg, E. L.; van Orden, J. W.

1989-04-01

276

Nucleon transfer at large internuclear distances in S-32 and Mo92,96,100  

Microsoft Academic Search

Nucleon transfer probability at large internuclear distances has been measured for the systems 32S + 92,96,100Mo in two energy regimes: below and above the Coulomb barrier. For the below-barrier measurements, target-like reaction products were detected in the focal plane of a recoil mass spectrometer. For the above- barrier measurements, projectile-like reaction products were detected in the focal plane of an

Diane Marie Herrick

1997-01-01

277

HYDRODYNAMICS, MIXING AND MASS TRANSFER IN A LARGE DIAMETER JET BUBBLE COLUMN  

Microsoft Academic Search

Experimental measurements for the axial and radial variations in gas holdup, axial and radial dispersion coefficients, volumetric gas-liquid mass transfer coefficient and liquid phase circulation velocity in a cone of a large diameter (122 cm) jet bubble column are presented. Two diameters of the inlet nozzle, namely 10.16 cm and 15.24 cm, three superficial gas velocities (based on cylinder diameter),

Y. T. SHAH; K. WISECARVER; A. BOROLE; A. SALAZAR; B. JOSHI; J. GUITIAN

1995-01-01

278

Ignition and boost effects on large-bore engine in-cylinder heat transfer  

Microsoft Academic Search

One cylinder of the Colorado State University large-bore test engine was instrumented with fast-response surface thermocouples for heat-transfer analysis. Probes were installed at several locations progressively farther from the ignition source and their outputs were recorded along with combustion pressure using a high-speed data-acquisition system. The engine was operated with two different ignition methods and the manifold boost pressure and

Paulius V Puzinauskas; Gary Hutcherson; Bryan D Willson

2003-01-01

279

Electron scattering from high-momentum neutrons in deuterium  

Microsoft Academic Search

We report results from an experiment measuring the semiinclusive reaction H2(e,e'ps) in which the proton ps is moving at a large angle relative to the momentum transfer. If we assume that the proton was a spectator to the reaction taking place on the neutron in deuterium, the initial state of that neutron can be inferred. This method, known as spectator

A. V. Klimenko; S. E. Kuhn; C. Butuceanu; K. S. Egiyan; K. A. Griffioen; G. Adams; P. Ambrozewicz; M. Anghinolfi; G. Asryan; H. Avakian; H. Bagdasaryan; N. Baillie; J. P. Ball; N. A. Baltzell; S. Barrow; V. Batourine; M. Battaglieri; I. Bedlinskiy; M. Bektasoglu; M. Bellis; N. Benmouna; A. S. Biselli; S. Bouchigny; S. Boiarinov; R. Bradford; D. Branford; W. K. Brooks; S. Bültmann; V. D. Burkert; J. R. Calarco; S. L. Careccia; D. S. Carman; A. Cazes; S. Chen; P. L. Cole; P. Coltharp; D. Cords; P. Corvisiero; D. Crabb; J. P. Cummings; N. B. Dashyan; R. Devita; E. De Sanctis; P. V. Degtyarenko; H. Denizli; L. Dennis; K. V. Dharmawardane; C. Djalali; G. E. Dodge; J. Donnelly; D. Doughty; M. Dugger; S. Dytman; O. P. Dzyubak; H. Egiyan; L. Elouadrhiri; P. Eugenio; R. Fatemi; G. Fedotov; R. G. Fersch; R. J. Feuerbach; H. Funsten; M. Garçon; G. Gavalian; G. P. Gilfoyle; K. L. Giovanetti; F. X. Girod; J. T. Goetz; A. Gonenc; C. I. O. Gordon; R. W. Gothe; M. Guidal; M. Guillo; N. Guler; L. Guo; V. Gyurjyan; C. Hadjidakis; R. S. Hakobyan; J. Hardie; F. W. Hersman; K. Hicks; I. Hleiqawi; M. Holtrop; C. E. Hyde-Wright; Y. Ilieva; D. G. Ireland; B. S. Ishkhanov; M. M. Ito; D. Jenkins; H. S. Jo; K. Joo; H. G. Juengst; J. D. Kellie; M. Khandaker; W. Kim; A. Klein; F. J. Klein; M. Kossov; L. H. Kramer; V. Kubarovsky; J. Kuhn; S. V. Kuleshov; J. Lachniet; J. M. Laget; J. Langheinrich; D. Lawrence; Ji Li; K. Livingston; S. McAleer; B. McKinnon; J. W. C. McNabb; B. A. Mecking; S. Mehrabyan; J. J. Melone; M. D. Mestayer; C. A. Meyer; T. Mibe; K. Mikhailov; R. Minehart; M. Mirazita; R. Miskimen; V. Mokeev; L. Morand; S. A. Morrow; J. Mueller; G. S. Mutchler; P. Nadel-Turonski; J. Napolitano; R. Nasseripour; S. Niccolai; G. Niculescu; I. Niculescu; B. B. Niczyporuk; R. A. Niyazov; M. Nozar; G. V. O'Rielly; M. Osipenko; A. I. Ostrovidov; E. Pasyuk; C. Paterson; J. Pierce; N. Pivnyuk; D. Pocanic; O. Pogorelko; S. Pozdniakov; B. M. Preedom; J. W. Price; Y. Prok; D. Protopopescu; B. A. Raue; G. Riccardi; G. Ricco; M. Ripani; B. G. Ritchie; F. Ronchetti; G. Rosner; P. Rossi; F. Sabatié; C. Salgado; J. P. Santoro; V. Sapunenko; R. A. Schumacher; V. S. Serov; Y. G. Sharabian; A. V. Skabelin; E. S. Smith; L. C. Smith; D. I. Sober; A. Stavinsky; S. S. Stepanyan; B. E. Stokes; P. Stoler; S. Strauch; M. Taiuti; D. J. Tedeschi; U. Thoma; A. Tkabladze; S. Tkachenko; L. Todor; C. Tur; M. Ungaro; M. F. Vineyard; A. V. Vlassov; L. B. Weinstein; D. P. Weygand; M. Williams; E. Wolin; M. H. Wood; A. Yegneswaran; L. Zana; J. Zhang; B. Zhao

2006-01-01

280

Magnetic Field as a Mechanism to Preserve Relativistic Momentum.  

National Technical Information Service (NTIS)

A thought-experimental approach is given to the definition of the magnetic field as a force arising from the need to conserve relativistic momentum. Mechanical and electromagnetic analogies are compared to illustrate the mechanisms of momentum transfer fr...

E. M. Dewan

1971-01-01

281

Hunt for new phenomena using large jet multiplicities and missing transverse momentum with ATLAS in 4.7 fb-1 of sqrt {s} = 7TeV proton-proton collisions  

NASA Astrophysics Data System (ADS)

Results are presented of a search for new particles decaying to large numbers of jets in association with missing transverse momentum, using 4.7 fb-1 of pp collision data at sqrt {s} = 7TeV collected by the ATLAS experiment at the Large Hadron Collider in 2011. The event selection requires missing transverse momentum, no isolated electrons or muons, and from ?6 to ?9 jets. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of a MSUGRA/CMSSM supersymmetric model, where, for large universal scalar mass m 0, gluino masses smaller than 840 GeV are excluded at the 95% confidence level, extending previously published limits. Within a simplified model containing only a gluino octet and a neutralino, gluino masses smaller than 870 GeV are similarly excluded for neutralino masses below 100 GeV.[Figure not available: see fulltext.

Aad, G.; Abbott, B.; Abdallah, J.; Khalek, S. Abdel; Abdelalim, A. A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Gonzalez, B. Alvarez; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Bella, L. Aperio; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Galtieri, A. Barbaro; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; da Costa, J. Barreiro Guimarães; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Harpaz, S. Behar; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Noccioli, E. Benhar; Garcia, J. A. Benitez; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Kuutmann, E. Bergeaas; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Bondioli, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodet, E.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; de Renstrom, P. A. Bruckman; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Buanes, T.; Buat, Q.; Bucci, F.; Buchanan, J.; Buchholz, P.; Buckingham, R. M.; Buckley, A. G.; Buda, S. I.; Budagov, I. A.; Budick, B.; Büscher, V.; Bugge, L.

2012-07-01

282

Momentum kicks due to quantum localization  

Microsoft Academic Search

The momentum changes caused by position measurements are a central feature of\\u000awave-particle duality. Here we investigate two cases - localization by a single\\u000aslit, and which-way detection in the double-slit interference experiment - and\\u000aexamine in detail the associated momentum changes. Particular attention is\\u000agiven to the transfer of momentum between particle and detector, and the recoil\\u000aof the

A. J. Short

2001-01-01

283

Transferring cold atoms in double magneto-optical trap by a continuous-wave transfer laser beam with large red detuning.  

PubMed

A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium atoms trapped in a vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) MOT by a continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity are adopted for the transfer laser beam, enhancement of the recapturing of atoms in the UHV MOT is clearly observed. Using the divergent transfer laser beam (diameter of approximately 1.60 mm in the vapor-cell MOT region) with typical power of approximately 20.2 mW, up to approximately 85% of transfer efficiency is obtained when the frequency detuning is set to around -1.2 GHz, and it is not sensitive to small detuning variation. This transfer is much efficient compared with that in the case of continuous-wave near-resonance weak transfer laser beam (typical power of order of approximately 100 microW and typical frequency detuning of approximately-10 MHz) which is normally used in double-MOT experiment. The enhancement is ascribed to the guiding effect on cold atomic flux by transverse dipole potential of the large red-detuned transfer laser beam. PMID:19123554

Wang, Junmin; Wang, Jing; Yan, Shubin; Geng, Tao; Zhang, Tiancai

2008-12-01

284

Energy and momentum changes during ballistic perforation  

Microsoft Academic Search

The paper presents an investigation of the energy and momentum changes of a projectile during the perforation of monolithic and composite targets. Three approaches are adopted: an analytical approach, based on first principles, an analytical development of established penetration prediction equations and an experimental investigation. Experimental evidence indicates that the energy and momentum transfer to the target is greatest at

J. G. Hetherington

1996-01-01

285

Conservation of Momentum 2  

NSDL National Science Digital Library

This inquiry activity should be performed after students have learned about momentum, but before they learn about conservation of momentum. Students will discover that when two objects push off each other, the momentum must be equal but in opposite direct

Horton, Michael

2009-05-30

286

Heat transfer in a coaxial-jet combustor using large-eddy simulation  

NASA Astrophysics Data System (ADS)

In this study numerical simulations of non-premixed methane-air combustion are conducted to investigate the effects of convective heat-transfer in a coaxial-jet combustor. The turbulent flow field is simulated via large-eddy simulation (LES) on a structured, orthogonal mesh using a conservative discretization of the transport equations. Turbulence/chemistry interactions are described using the flamelet/progress-variable approach of Pierce and Moin (J. Fluid Mech. 504, 73-97, 2004) in which filtered transport equations are solved for the mixture fraction and a reaction progress variable. In the present work the method is extended by a filtered energy equation to describe heat transfer to the confinement. The resulting velocity, species concentration, and temperature fields are compared to the experiments of Spadaccini, et al. (U.S. EPA Rep. EPA-600/2-76-247a, 1976). This work is supported by the U.S. Department of Energy's ASC program.

Shunn, Lee; Moin, Parviz

2004-11-01

287

An instrument to measure the convective heat transfer coefficient on large vessels.  

PubMed

Hepatocellular carcinoma is one of the most common malignancies worldwide. During radiofrequency hepatic ablation, the tumor is heated by means of radiofrequency energy. The heating causes necrosis of the malignant tumor. Thus, if the procedure is successful it can cure the patient. Studies have shown that recurrences occur after the treatment and these recurrences frequently take place next to the hepatic artery and portal vein. The recurrences occur due to the high convective loss on these vessels. This work proposed, developed and tested an instrument for the measurement of the convective heat transfer coefficient (h) in large vessels. Moreover, this work developed a mechanical simulator and validated an equation developed by Consiglieri et al, which analytically determines the value of h. The instrument was tested using a mechanical simulator that reproduces the flow conditions and the geometry of large vessels in the liver. A flow velocity of 0.2 m/s was simulated in order to mock the typical flow at the portal vein. The average value of h using the experimental apparatus was 2130+/-40 W.m(-2).K(-1) (mean+/-SD). The results showed that the error of the proposed method is approximately 22%. This work showed that the instrument can be used for measuring h in vitro and that the Consiglieri's equation can be used to determine the convective heat transfer coefficient on large vessels. PMID:19162607

Miguel, Alaor Faria; de O Nascimento, Francisco Assis; da Rocha, Adson Ferreira; dos Santos, Icaro

2008-01-01

288

Modeling transfer of sup 137 Cs fallout in a large Finnish watercourse  

SciTech Connect

In the Finnish environment, lakes provide very important transfer pathways for various pollutants. In this study, a large watercourse was modeled using the dynamic compartment model DETRA. The model includes a fish model for roach, nonpredatory and predatory perches, and pike. Transfer of {sup 137}Cs fallout deposited onto the Kymijoki drainage area after the Chernobyl accident was calculated using the model. In the model, fallout was assumed to consist of a soluble and insoluble component, behaving differently in the environment. Model predictions were compared with measured concentrations. Lake Paeijaenne, the largest lake of the watercourse, was studied most extensively. Calculated concentrations in lake water were consistent with measured concentrations. However, calculated concentrations in fish were lower than measured concentrations. To test the model by using additional experimental data, transfer of nuclear weapons testing fallout was also calculated. The processes that cause the rather rapid removal of {sup 137}Cs from lake water need to be studied further using more detailed data. In the long term, runoff and resuspension of sedimentary material were considered to be important in causing concentrations in lake water.

Korhonen, R. (VTT, Nuclear Engineering Laboratory, Helsinki (Finland))

1990-10-01

289

Suppressed pi0 Production at Large Transverse Momentum in Central Au+Au Collisions at (sNN)=200 GeV  

Microsoft Academic Search

Transverse momentum spectra of neutral pions in the range 1

S. S. Adler; S. Afanasiev; C. Aidala; N. N. Ajitanand; Y. Akiba; J. Alexander; R. Amirikas; L. Aphecetche; S. H. Aronson; R. Averbeck; T. C. Awes; R. Azmoun; V. Babintsev; A. Baldisseri; K. N. Barish; P. D. Barnes; B. Bassalleck; S. Bathe; S. Batsouli; V. Baublis; A. Bazilevsky; S. Bhagavatula; Y. Berdnikov; J. G. Boissevain; H. Borel; S. Borenstein; M. L. Brooks; D. S. Brown; N. Bruner; D. Bucher; H. Buesching; V. Bumazhnov; G. Bunce; J. M. Burward-Hoy; S. Butsyk; X. Camard; S. Chernichenko; P. Chand; W. C. Chang; C. Y. Chi; J. Chiba; M. Chiu; I. J. Choi; J. Choi; R. K. Choudhury; T. Chujo; V. Cianciolo; Y. Cobigo; B. A. Cole; P. Constantin; D. G. D'Enterria; G. David; H. Delagrange; A. Denisov; A. Deshpande; E. J. Desmond; O. Dietzsch; O. Drapier; A. Drees; K. A. Drees; R. Du Rietz; A. Durum; D. Dutta; Y. V. Efremenko; K. El Chenawi; A. Enokizono; H. En'yo; S. Esumi; L. Ewell; D. E. Fields; F. Fleuret; S. L. Fokin; B. D. Fox; Z. Fraenkel; J. E. Frantz; A. Franz; A. D. Frawley; S.-Y. Fung; S. Garpman; T. K. Ghosh; A. Glenn; G. Gogiberidze; M. Gonin; J. Gosset; Y. Goto; R. Granier de Cassagnac; N. Grau; S. V. Greene; M. Grosse Perdekamp; W. Guryn; H.-Å. Gustafsson; T. Hachiya; J. S. Haggerty; H. Hamagaki; A. G. Hansen; E. P. Hartouni; M. Harvey; R. Hayano; X. He; M. Heffner; T. K. Hemmick; J. M. Heuser; M. Hibino; J. C. Hill; W. Holzmann; K. Homma; B. Hong; A. Hoover; T. Ichihara; V. V. Ikonnikov; K. Imai; L. Isenhower; M. Ishihara; M. Issah; A. Isupov; B. V. Jacak; W. Y. Jang; Y. Jeong; J. Jia; O. Jinnouchi; B. M. Johnson; S. C. Johnson; K. S. Joo; D. Jouan; S. Kametani; N. Kamihara; J. H. Kang; S. S. Kapoor; K. Katou; S. Kelly; B. Khachaturov; A. Khanzadeev; J. Kikuchi; D. H. Kim; D. J. Kim; D. W. Kim; E. Kim; G.-B. Kim; H. J. Kim; E. Kistenev; A. Kiyomichi; K. Kiyoyama; C. Klein-Boesing; H. Kobayashi; L. Kochenda; V. Kochetkov; D. Koehler; T. Kohama; M. Kopytine; D. Kotchetkov; A. Kozlov; P. J. Kroon; C. H. Kuberg; K. Kurita; Y. Kuroki; M. J. Kweon; Y. Kwon; G. S. Kyle; R. Lacey; V. Ladygin; J. G. Lajoie; A. Lebedev; S. Leckey; D. M. Lee; S. Lee; M. J. Leitch; X. H. Li; H. Lim; A. Litvinenko; M. X. Liu; Y. Liu; C. F. Maguire; Y. I. Makdisi; A. Malakhov; V. I. Manko; Y. Mao; G. Martinez; M. D. Marx; H. Masui; F. Matathias; T. Matsumoto; P. L. McGaughey; E. Melnikov; F. Messer; Y. Miake; J. Milan; T. E. Miller; A. Milov; S. Mioduszewski; R. E. Mischke; G. C. Mishra; J. T. Mitchell; A. K. Mohanty; J. M. Moss; F. Mühlbacher; D. Mukhopadhyay; M. Muniruzzaman; J. Murata; S. Nagamiya; J. L. Nagle; T. Nakamura; B. K. Nandi; M. Nara; J. Newby; P. Nilsson; A. S. Nyanin; J. Nystrand; E. O'Brien; C. A. Ogilvie; H. Ohnishi; I. D. Ojha; K. Okada; M. Ono; V. Onuchin; A. Oskarsson; I. Otterlund; K. Oyama; K. Ozawa; D. Pal; A. P. Palounek; V. S. Pantuev; V. Papavassiliou; A. Parmar; S. F. Pate; T. Peitzmann; J.-C. Peng; V. Peresedov; C. Pinkenburg; R. P. Pisani; F. Plasil; M. L. Purschke; A. K. Purwar; J. Rak; I. Ravinovich; K. F. Read; M. Reuter; K. Reygers; V. Riabov; Y. Riabov; G. Roche; A. Romana; M. Rosati; P. Rosnet; S. S. Ryu; M. E. Sadler; N. Saito; T. Sakaguchi; M. Sakai; S. Sakai; V. Samsonov; L. Sanfratello; R. Santo; H. D. Sato; S. Sato; S. Sawada; Y. Schutz; V. Semenov; R. Seto; M. R. Shaw; T. K. Shea; T.-A. Shibata; K. Shigaki; T. Shiina; C. L. Silva; D. Silvermyr; K. S. Sim; C. P. Singh; V. Singh; M. Sivertz; A. Soldatov; R. A. Soltz; W. E. Sondheim; S. P. Sorensen; I. V. Sourikova; F. Staley; P. W. Stankus; E. Stenlund; M. Stepanov; A. Ster; S. P. Stoll; T. Sugitate; J. P. Sullivan; E. M. Takagui; A. Taketani; M. Tamai; K. H. Tanaka; Y. Tanaka; K. Tanida; M. J. Tannenbaum; P. Tarján; J. D. Tepe; T. L. Thomas; J. Tojo; H. Torii; R. S. Towell; I. Tserruya; H. Tsuruoka; S. K. Tuli; H. Tydesjö; N. Tyurin; H. W. van Hecke; J. Velkovska; M. Velkovsky; L. Villatte; A. A. Vinogradov; M. A. Volkov; E. Vznuzdaev; X. R. Wang; Y. Watanabe; S. N. White; F. K. Wohn; C. L. Woody; W. Xie; Y. Yang; A. Yanovich; S. Yokkaichi; G. R. Young; I. E. Yushmanov; W. A. Zajc; C. Zhang; S. Zhou; L. Zolin

2003-01-01

290

Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at root s(NN)=2.76 TeV  

Microsoft Academic Search

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at root s(NN) = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in |eta| < 0.8 and 0.3 < p(T)

K. Aamodt; A. A. Quintana; D. Adamova; A. M. Adare; M. M. Aggarwal; G. A. Rinella; A. G. Agocs; S. A. Salazar; Z. Ahammed; N. Ahmad; A. A. Masoodi; S. U. Ahn; A. Akindinov; D. Aleksandrov; B. Alessandro; R. A. Molina; A. Alici; A. Alkin; E. A. Avina; T. Alt; V. Altini; S. Altinpinar; I. Altsybeev; C. Andrei; A. Andronic; V. Anguelov; C. Anson; T. Anticic; F. Antinori; P. Antonioli; L. Aphecetche; H. Appelshauser; N. Arbor; S. Arcelli; A. Arend; N. Armesto; R. Arnaldi; T. Aronsson; I. C. Arsene; A. Asryan; A. Augustinus; R. Averbeck; T. C. Awes; J. Aysto; M. D. Azmi; M. Bach; A. Badala; Y. W. Baek; S. Bagnasco; R. Bailhache; R. Bala; R. B. Ferroli; A. Baldisseri; A. Baldit; J. Ban; R. Barbera; F. Barile; G. G. Barnafoldi; L. S. Barnby; V. Barret; J. Bartke; M. Basile; N. Bastid; B. Bathen; G. Batigne; B. Batyunya; C. Baumann; I. G. Bearden; H. Beck; I. Belikov; F. Bellini; R. Bellwied; E. Belmont-Moreno; S. Beole; I. Berceanu; A. Bercuci; E. Berdermann; Y. Berdnikov; L. Betev; A. Bhasin; A. K. Bhati; L. Bianchi; N. Bianchi; C. Bianchin; J. Bielcik; J. Bielcikova; A. Bilandzic; E. Biolcati; A. Blanc; F. Blanco; D. Blau; C. Blume; M. Boccioli; N. Bock; A. Bogdanov; H. Boggild; M. Bogolyubsky; L. Boldizsar; M. Bombara; C. Bombonati; H. Borel; C. Bortolin; S. Bose; F. Bossu; M. Botje; S. Bottger; B. Boyer; P. Braun-Munzinger; L. Bravina; M. Bregant; T. Breitner; M. Broz; R. Brun; E. Bruna; G. E. Bruno; D. Budnikov; H. Buesching; O. Busch; Z. Buthelezi; D. Caffarri; X. Cai; H. Caines; E. C. Villar; P. Camerini; V. C. Roman; G. C. Romeo; F. Carena; W. Carena; F. Carminati; A. C. Diaz; M. Caselle; J. C. Castellanos; V. Catanescu; C. Cavicchioli; P. Cerello; B. Chang; S. Chapeland; J. L. Charvet; S. Chattopadhyay; M. Cherney; C. Cheshkov; B. Cheynis; E. Chiavassa; V. C. Barroso; D. D. Chinellato; P. Chochula; M. Chojnacki; P. Christakoglou; C. H. Christensen; P. Christiansen; T. Chujo; C. Cicalo; L. Cifarelli; F. Cindolo; J. Cleymans; F. Coccetti; J. P. Coffin; S. Coli; G. C. Balbastre; Z. C. del Valle; P. Constantin; G. Contin; J. G. Contreras; T. M. Cormier; Y. C. Morales; I. C. Maldonado; P. Cortese; M. R. Cosentino; F. Costa; M. E. Cotallo; E. Crescio; P. Crochet; E. Cuautle; L. Cunqueiro; G. D. Erasmo; A. Dainese; H. H. Dalsgaard; A. Danu; D. Das; I. Das; A. Dash; S. Dash; S. De; A. D. Moregula; G. O. V. de Barros; A. De Caro; G. de Cataldo; J. de Cuveland; A. De Falco; D. De Gruttola; N. De Marco; S. De Pasquale; R. De Remigis; R. de Rooij; H. Delagrange; Y. D. Mercado; G. Dellacasa; A. Deloff; V. Demanov; E. Denes; A. Deppman; D. Di Bari; C. Di Giglio; S. Di Liberto; A. Di Mauro; P. Di Nezza; T. Dietel; R. Divia; O. Djuvsland; A. Dobrin; T. Dobrowolski; I. Dominguez; B. Donigus; O. Dordic; O. Driga; A. K. Dubey; J. Dubuisson; L. Ducroux; P. Dupieux; A. K. D. Majumdar; M. R. D. Majumdar; D. Elia; D. Emschermann; H. Engel; H. A. Erdal; B. Espagnon; M. Estienne; S. Esumi; D. Evans; S. Evrard; G. Eyyubova; C. W. Fabjan; D. Fabris; J. Faivre; D. Falchieri; A. Fantoni; M. Fasel; R. Fearick; A. Fedunov; D. Fehlker; V. Fekete; D. Felea; C. Feofilov; A. F. Tellez; A. Ferretti; R. Ferretti; M. A. S. Figueredo; S. Filchagin; R. Fini; D. Finogeev; F. M. Fionda; E. M. Fiore; M. Floris; S. Foertsch; P. Foka; S. Fokin; E. Fragiacomo; M. Fragkiadakis; U. Frankenfeld; U. Fuchs; F. Furano; C. Furget; M. F. Girard; J. J. Gaardhoje; S. Gadrat; M. Gagliardi; A. Gago; M. Gallio; P. Ganoti; C. Garabatos; R. Gemme; J. Gerhard; M. Germain; C. Geuna; A. Gheata; M. Gheata; B. Ghidini; P. Ghosh; M. R. Girard; G. Giraudo; P. Giubellino; E. Gladysz-Dziadus; P. Glassel; R. Gomez; L. H. Gonzalez-Trueba; P. Gonzalez-Zamora; H. G. Santos; S. Gorbunov; S. Gotovac; V. Grabski; R. Grajcarek; A. Grelli; A. Grigoras; C. Grigoras; V. Grigoriev; A. Grigoryan; S. Grigoryan; B. Grinyov; N. Grion; P. Gros; J. F. Grosse-Oetringhaus; J. Y. Grossiord; R. Grosso; F. Guber; R. Guernane; C. G. Gutierrez; B. Guerzoni; K. Gulbrandsen; T. Gunji; A. Gupta; R. Gupta; H. Gutbrod; O. Haaland; C. Hadjidakis; M. Haiduc; H. Hamagaki; G. Hamar; J. W. Harris; M. Hartig; D. Hasch; D. Hasegan; D. Hatzifotiadou; A. Hayrapetyan; M. Heide; M. Heinz; H. Helstrup; A. Herghelegiu; C. Hernandez; G. H. Corral; N. Herrmann; K. F. Hetland; B. Hicks; P. T. Hille; B. Hippolyte; T. Horaguchi; Y. Hori; P. Hristov; I. Hrivnacova; M. Huang; S. Huber; T. J. Humanic; D. S. Hwang; R. Ichou; R. Ilkaev; I. Ilkiv; M. Inaba; E. Incani; G. M. Innocenti; P. C. Innocenti; M. Ippolitov; M. Irfan; C. Ivan; A. Ivanov; M. Ivanov; V. Ivanov; A. Jacholkowski; P. M. Jacobs; L. Jancurova; S. Jangal; R. Janik; S. P. Jayarathna; S. Jena; L. Jirden; G. T. Jones; P. G. Jones; P. Jovanovic; H. Jung; W. Jung; A. Jusko; S. Kalcher; P. Kalinak; M. Kalisky; T. Kalliokoski; A. Kalweit; R. Kamermans; K. Kanaki; E. Kang; J. H. Kang; V. Kaplin; O. Karavichev; T. Karavicheva

2011-01-01

291

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt{s} = 7 {TeV} with the ATLAS experiment  

NASA Astrophysics Data System (ADS)

This paper describes an analysis of the angular distribution of W? e? and W? ?? decays, using data from pp collisions at sqrt{s} = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb-1. Using the decay lepton transverse momentum and the missing transverse momentum, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f 0, f L and f R over two ranges of W transverse momentum (pTW ): 35 < pTW< 50 GeV and pTW> 50 GeV. Good agreement is found with theoretical predictions. For pTW> 50 GeV, the values of f 0 and f L- f R, averaged over charge and lepton flavour, are measured to be: f 0=0.127±0.030±0.108 and f L- f R=0.252±0.017±0.030, where the first uncertainties are statistical, and the second include all systematic effects.

Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Aliyev, M.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amaral, P.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amorós, G.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Astvatsatourov, A.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Ay, C.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barashkou, A.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Ben Ami, S.; Benary, O.; Benchekroun, D.; Benchouk, C.; Bendel, M.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertinelli, F.; Bertolucci, F.; Besana, M. I.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bona, M.; Bondarenko, V. G.; Bondioli, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Braem, A.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodbeck, T. J.; Brodet, E.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.

2012-05-01

292

The effect of scattering by soot aggregates on radiative transfer in large-scale hydrocarbon pool fires  

SciTech Connect

The modeling of large-scale hydrocarbon fuel fires is under investigation at Sandia National Laboratories. This work is being pursued as part of a program to determine energy transfer rates to weapon systems during fuel fire accident scenarios.

W. G. Houf

1999-08-01

293

Search for Dark Matter Candidates and Large Extra Dimensions in Events with a Photon and Missing Transverse Momentum in pp Collision Data at s=7TeV with the ATLAS Detector  

NASA Astrophysics Data System (ADS)

Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum in proton-proton collisions at s=7TeV are reported. Data collected by the ATLAS experiment at the LHC corresponding to an integrated luminosity of 4.6fb-1 are used. Good agreement is observed between the data and the standard model predictions. The results are translated into exclusion limits on models with large extra spatial dimensions and on pair production of weakly interacting dark matter candidates.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bittner, B.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.

2013-01-01

294

Intramolecular energy transfer and the driving mechanisms for large-amplitude collective motions of clusters.  

PubMed

This paper uncovers novel and specific dynamical mechanisms that initiate large-amplitude collective motions in polyatomic molecules. These mechanisms are understood in terms of intramolecular energy transfer between modes and driving forces. Structural transition dynamics of a six-atom cluster between a symmetric and an elongated isomer is highlighted as an illustrative example of what is a general message. First, we introduce a general method of hyperspherical mode analysis to analyze the energy transfer among internal modes of polyatomic molecules. In this method, the (3n-6) internal modes of an n-atom molecule are classified generally into three coarse level gyration-radius modes, three fine level twisting modes, and (3n-12) fine level shearing modes. We show that a large amount of kinetic energy flows into the gyration-radius modes when the cluster undergoes structural transitions by changing its mass distribution. Based on this fact, we construct a reactive mode as a linear combination of the three gyration-radius modes. It is shown that before the reactive mode acquires a large amount of kinetic energy, activation or inactivation of the twisting modes, depending on the geometry of the isomer, plays crucial roles for the onset of a structural transition. Specifically, in a symmetric isomer with a spherical mass distribution, activation of specific twisting modes drives the structural transition into an elongated isomer by inducing a strong internal centrifugal force, which has the effect of elongating the mass distribution of the system. On the other hand, in an elongated isomer, inactivation of specific twisting modes initiates the structural transition into a symmetric isomer with lower potential energy by suppressing the elongation effect of the internal centrifugal force and making the effects of the potential force dominant. This driving mechanism for reactions as well as the present method of hyperspherical mode analysis should be widely applicable to molecular reactions in which a system changes its overall mass distribution in a significant way. PMID:19368433

Yanao, Tomohiro; Koon, Wang Sang; Marsden, Jerrold E

2009-04-14

295

Intramolecular energy transfer and the driving mechanisms for large-amplitude collective motions of clusters  

NASA Astrophysics Data System (ADS)

This paper uncovers novel and specific dynamical mechanisms that initiate large-amplitude collective motions in polyatomic molecules. These mechanisms are understood in terms of intramolecular energy transfer between modes and driving forces. Structural transition dynamics of a six-atom cluster between a symmetric and an elongated isomer is highlighted as an illustrative example of what is a general message. First, we introduce a general method of hyperspherical mode analysis to analyze the energy transfer among internal modes of polyatomic molecules. In this method, the (3n-6) internal modes of an n-atom molecule are classified generally into three coarse level gyration-radius modes, three fine level twisting modes, and (3n-12) fine level shearing modes. We show that a large amount of kinetic energy flows into the gyration-radius modes when the cluster undergoes structural transitions by changing its mass distribution. Based on this fact, we construct a reactive mode as a linear combination of the three gyration-radius modes. It is shown that before the reactive mode acquires a large amount of kinetic energy, activation or inactivation of the twisting modes, depending on the geometry of the isomer, plays crucial roles for the onset of a structural transition. Specifically, in a symmetric isomer with a spherical mass distribution, activation of specific twisting modes drives the structural transition into an elongated isomer by inducing a strong internal centrifugal force, which has the effect of elongating the mass distribution of the system. On the other hand, in an elongated isomer, inactivation of specific twisting modes initiates the structural transition into a symmetric isomer with lower potential energy by suppressing the elongation effect of the internal centrifugal force and making the effects of the potential force dominant. This driving mechanism for reactions as well as the present method of hyperspherical mode analysis should be widely applicable to molecular reactions in which a system changes its overall mass distribution in a significant way.

Yanao, Tomohiro; Koon, Wang Sang; Marsden, Jerrold E.

2009-04-01

296

Approximate solutions of the filtered radiative transfer equation in large eddy simulations of turbulent reactive flows  

SciTech Connect

An analysis of the relevance of turbulence-radiation interaction in the numerical simulation of turbulent reactive flows is presented. A semi-causal stochastic model was used to generate a time-series of turbulent scalar fluctuations along optical paths of Sandia flame D, a widely studied piloted turbulent jet nonpremixed flame. The radiative transfer equation was integrated along these paths for every realization using a grid resolution typical of a direct numerical simulation. The correlated k-distribution method was employed to compute the radiative properties of the medium. The results were used to determine the ensemble average, as well as the extreme values, of quantities that indicate the importance of the turbulence-radiation interaction. Several approximate methods are then proposed to solve the filtered radiative transfer equation in the framework of large eddy simulations. The proposed methods are applicable along with combustion models that either assume the filtered probability density function of a conserved scalar or solve a transport equation for a joint scalar or joint scalar/velocity filtered density function. It is concluded that the errors resulting from neglecting the turbulence-radiation interaction in large eddy simulations are much lower than those found in Reynolds-averaged Navier-Stokes calculations. The optically thin fluctuation approximation may be extended to large eddy simulations yielding predictions in excellent agreement with the reference solution. If the turbulence-radiation interaction is accounted for using this approximation, the average relative error of the filtered total radiation intensity is generally below 0.3% for the studied flame. (author)

Coelho, P.J. [Mechanical Engineering Department, Instituto Superior Tecnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa (Portugal)

2009-05-15

297

Turbulent transfer of the large-scale magnetic field in the rotating convective zone of the sun  

NASA Astrophysics Data System (ADS)

Consideration is given to the problem of the turbulent transfer of the large-scale magnetic field in a density-stratified convective zone, with the turbulence anisotropy excited by the sun's rotation taken into account. The anisotropy parameter (the Coriolis number - reciprocal of the Rossby number) and the transfer velocity components for the Spruit convective zone model are calculated. The transfer directions of the poloidal and toroidal components of the mean magnetic field do not coincide. The possible role of the turbulent transfer effects in the observed redistribution of magnetic fields over a solar cycle is discussed.

Krivodubskij, V. N.

1992-08-01

298

Effect of solar rotation on turbulent transfer of the large-scale magnetic field in the convective zone  

NASA Astrophysics Data System (ADS)

The turbulent transfer of the large-scale magnetic field is investigated in the density-stratified convective zone with due regard for turbulence anisotropy excited by solar rotation. It is found that the transfer directions of poloidal and toroidal components of the magnetic field do not coincide in the rotating convective envelope. The values of different transfer velocity components of the magnetic fields for the Spruit convective zone model are calculated. The possible role of the transport effects in the large-scale field dynamics over a solar cycle is discussed.

Kichatinov, L. L.; Krivodubs'kii, V. N.

1991-12-01

299

Labor supply responses to large social transfers: Longitudinal evidence from South Africa.  

PubMed

In many parts of the developing world, rural areas exhibit high rates of unemployment and underemployment. Understanding what prevents people from migrating to find better jobs is central to the development process. In this paper, we examine whether binding credit constraints and childcare constraints limit the ability of households to send labor migrants, and whether the arrival of a large, stable source of income - here, the South African old-age pension - helps households to overcome these constraints. Specifically, we quantify the labor supply responses of prime-aged individuals to changes in the presence of pensioners, using longitudinal data collected in KwaZulu-Natal. Our ability to compare households and individuals before and after pension receipt, and pension loss, allows us to control for a host of unobservable household and individual characteristics that may determine labor market behavior. We find that large cash transfers to elderly South Africans lead to increased employment among prime-aged members of their households, a result that is masked in cross-sectional analysis by differences between pension and non-pension households. Pension receipt also influences where this employment takes place. We find large, significant effects on labor migration upon pension arrival. The pension's impact is attributable both to the increase in household resources it represents, which can be used to stake migrants until they become self-sufficient, and to the presence of pensioners who can care for small children, which allows prime-aged adults to look for work elsewhere. PMID:19750139

Ardington, Cally; Case, Anne; Hosegood, Victoria

2009-01-01

300

Fractional-photon-assisted tunneling in an optical superlattice: Large contribution to particle transfer  

SciTech Connect

Fractional-photon-assisted tunneling is investigated both analytically and numerically for few interacting ultracold atoms in the double wells of an optical superlattice. This can be realized experimentally by adding periodic shaking to an existing experimental setup [Cheinet et al., Phys. Rev. Lett. 101, 090404 (2008)]. Photon-assisted tunneling is visible in the particle transfer between the wells of the individual double wells. In order to understand the physics of the photon-assisted tunneling, an effective model based on the rotating-wave approximation is introduced. The validity of this effective approach is tested for wide parameter ranges that are accessible to experiments in double-well lattices. The effective model goes well beyond previous perturbation theory approaches and is useful for investigating in particular the fractional-photon-assisted tunneling resonances. Analytic results on the level of the experimentally realizable two-particle quantum dynamics show very good agreement with the numerical solution of the time-dependent Schroedinger equation. Far from being a small effect, both the one-half-photon and the one-third-photon resonances are shown to have large effects on the particle transfer.

Esmann, Martin; Teichmann, Niklas; Weiss, Christoph [Institut fuer Physik, Carl von Ossietzky Universitaet, D-26111 Oldenburg (Germany)

2011-06-15

301

Astrophysically relevant experiments on radiation transfer through plasmas with large velocity gradients  

SciTech Connect

The transfer of radiation through plasmas with large velocity gradients is of relevance to several astrophysical situations, such as supernova explosions, maser operation, and stellar winds. Similar conditions often prevail in laser-produced plasmas, with velocity gradients of order 10{sup 9}s{sup {minus}1} significantly altering the effective optical depth and line shape. Some of the simplest cases to study experimentally are the hydrogenic resonance lines. Experiments performed in both planar and cylindrical geometry, comparing the observed line profiles with those modeled using a one-dimensional Lagrangian hydrocode, incorporating average-atom nonlocal thermodynamic equilibrium (non-LTE) atomic physics are described. The opacity effects on the ion populations are treated within the escape factor approximation, taking into account the effects of the velocity gradient. The hydrocode gives time- and space-dependent values of the electron and ion densities, excited state fractions, electron and ion temperatures, and velocities. The hydrodynamic output is post-processed with a radiative transfer routine to construct the simulated line shape. Details of the experiments and results are presented, and relevance to the astrophysical situations discussed. {copyright} {ital 1997 American Institute of Physics.}

Wark, J.S. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Rose, S.J. [Rutherford Appleton Laboratory, Chilton, Didcot, Oxon. OX11 0QX (United Kingdom); Patel, P.K. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Djaoui, A. [Rutherford Appleton Laboratory, Chilton, Didcot, Oxon. OX11 0QX (United Kingdom); Renner, O. [Institute of Physics, Czech Academy of Sciences, Prague 18040 (Czech Republic); Hauer, A. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

1997-05-01

302

Identified hadron spectra at large transverse momentum in p + p and d + Au collisions at s NN = 200  GeV  

Microsoft Academic Search

We present the transverse momentum (pT) spectra for identified charged pions, protons and anti-protons from p+p and d+Au collisions at sNN=200 GeV. The spectra are measured around midrapidity (|y|0.5) over the range of 0.3pT10 GeV\\/c with particle identification from the ionization energy loss and its relativistic rise in the time projection chamber and time-of-flight in STAR. The charged pion and proton+anti-proton spectra

J. Adams; M. M. Aggarwalac; Z. Ahammed; J. Amonett; B. D. Anderson; M. Anderson; D. Arkhipkin; G. S. Averichevk; S. K. Badyal; Y. Bai; J. Balewski; O. Barannikova; L. S. Barnby; J. Baudot; S. Bekele; V. V. Belaga; A. Bellingeri-Laurikainen; R. Bellwied; B. I. Bezverkhny; S. Bharadwaj; A. Bhasin; H. Bichsel; J. Bielcik; J. Bielcikova; A. Billmeier; L. C. Bland; L. C. Bland; S.-L. Blyth; B. E. Bonner; M. Botje; J. Bouchet; A. V. Brandin; M. Bystersky; R. V. Cadman; X. Z. Cai; H. Caines; M. Calderón de la Barca Sánchez; J. Castillo; O. Catu; D. Cebra; Z. Chajecki; P. Chaloupka; S. Chattopadhyay; H. F. Chen; J. H. Chen; Y. Chen; J. Cheng; M. Cherney; A. Chikanian; H. A. Choi; W. Christie; J. P. Coffin; T. M. Cormier; M. R. Cosentino; J. G. Cramer; H. J. Crawford; D. Das; S. Das; M. Daugherity; M. M. de Moura; T. G. Dedovich; M. DePhillips; A. A. Derevschikov; L. Didenko; T. Dietel; P. Djawotho; S. M. Dogra; W. J. Dong; X. Dong; J. E. Draper; F. Du; V. B. Dunin; J. C. Dunlop; M. R. Dutta Mazumdar; V. Eckardt; W. R. Edwards; L. G. Efimov; V. Emelianov; J. Engelage; G. Eppley; B. Erazmus; M. Estienne; P. Fachini; R. Fatemi; J. Fedorisin; K. Filimonov; P. Filip; E. Finch; V. Fine; Y. Fisyak; K. S. F. Fornazier; J. Fu; C. A. Gagliardi; L. Gaillard; J. Gans; M. S. Ganti; V. Ghazikhanian; P. Ghosh; J. E. Gonzalez; Y. G. Gorbunov; H. Gos; O. Grachov; O. Grebenyuk; D. Grosnick; S. M. Guertin; Y. Guo; A. Gupta; N. Gupta; T. D. Gutierrez; B. Haag; T. J. Hallman; A. Hamed; J. W. Harris; M. Heinz; T. W. Henry; S. Hepplemann; B. Hippolyte; A. Hirsch; E. Hjort; G. W. Hoffmann; M. J. Horner; H. Z. Huang; S. L. Huang; E. W. Hughes; T. J. Humanic; G. Igo; P. Jacobs; W. W. Jacobs; P. Jakl; F. Jia; H. Jiang; P. G. Jones; E. G. Judd; S. Kabana; K. Kang; J. Kapitan; M. Kaplan; D. Keane; A. Kechechyan; V. Yu. Khodyrev; B. C. Kim; J. Kiryluk; A. Kisiel; E. M. Kislov; S. R. Klein; D. D. Koetke; T. Kollegger; M. Kopytine; L. Kotchenda; V. Kouchpil; K. L. Kowalik; M. Kramer; P. Kravtsov; V. I. Kravtsov; K. Krueger; C. Kuhn; A. I. Kulikov; A. A. Kuznetsov; M. A. C. Lamont; J. M. Landgraf; S. Lange; F. Laue; J. Lauret; A. Lebedev; R. Lednicky; C.-H. Lee; S. Lehocka; M. J. LeVine; C. Li; Q. Li; Y. Li; G. Lin; S. J. Lindenbaum; M. A. Lisa; F. Liu; H. Liu; J. Liu; L. Liu; Z. Liu; T. Ljubicic; W. J. Llope; H. Long; R. S. Longacre; M. Lopez-Noriega; W. A. Love; Y. Lu; T. Ludlam; D. Lynn; G. L. Ma; J. G. Ma; Y. G. Ma; D. Magestro; S. Mahajan; D. P. Mahapatra; R. Majka; L. K. Mangotra; R. Manweiler; S. Margetis; C. Markert; L. Martin; H. S. Matis; Yu. A. Matulenko; C. J. McClain; T. S. McShane; Yu. Melnick; A. Meschanin; M. L. Miller; N. G. Minaev; S. Mioduszewski; C. Mironov; A. Mischke; D. K. Mishra; J. Mitchell; B. Mohanty; L. Molnar; C. F. Moore; D. A. Morozov; M. G. Munhoz; B. K. Nandi; S. K. Nayak; T. K. Nayak; J. M. Nelson; P. K. Netrakanti; V. A. Nikitin; L. V. Nogach; S. B. Nurushev; G. Odyniec; A. Ogawa; V. Okorokov; M. Oldenburg; D. Olson; M. Pachr; S. K. Pal; Y. Panebratsev; S. Y. Panitkin; A. I. Pavlinov; T. Pawlak; T. Peitzmann; V. Perevoztchikov; C. Perkins; W. Peryt; V. A. Petrov; S. C. Phatak; R. Picha; M. Planinic; J. Pluta; N. Poljak; J. Porter; A. M. Poskanzer; E. Potrebenikova; B. V. K. S. Potukuchi; D. Prindle; C. Pruneau; J. Putschke; G. Rakness; R. Raniwala; S. Raniwala; R. L. Ray; S. V. Razin; J. Reinnarth; D. Relyea; F. Retiere; A. Ridiger; H. G. Ritter; J. B. Roberts; O. V. Rogachevskiy; J. L. Romero; A. Rose; C. Roy; L. Ruan; M. J. Russcher; R. Sahoo; I. Sakrejda; S. Salur; J. Sandweiss; M. Sarsour; I. Savin; P. S. Sazhin; J. Schambach; R. P. Scharenberg; N. Schmitz; K. Schweda; J. Seger; I. Selyuzhenkov; P. Seyboth; A. Shabetai; E. Shahaliev; M. Shao; M. Sharma; W. Q. Shen; S. S. Shimanskiy; E. Sichtermann; F. Simon; R. N. Singaraju; R. Snellings; G. Sood; P. Sorensen; J. Sowinski; H. M. Spinka; B. Srivastava; A. Stadnik; T. D. S. Stanislaus; R. Stock; A. Stolpovsky; M. Strikhanov; B. Stringfellow; A. A. P. Suaide; E. Sugarbaker; M. Sumbera; Z. Sun; B. Surrow; M. Swanger; T. J. M. Symons; A. Szanto de Toledo; A. Tai; J. Takahashi; A. H. Tang; T. Tarnowsky; D. Thein; J. H. Thomas; A. R. Timmins; S. Timoshenko; M. Tokarev; T. A. Trainor; S. Trentalange; R. E. Tribble; O. D. Tsai; J. Ulery; T. Ullrich; D. G. Underwood; G. Van Buren; N. van der Kolk; M. van Leeuwen; A. M. Vander Molen; R. Varma; I. M. Vasilevski; A. N. Vasiliev; R. Vernet; S. E. Vigdor; Y. P. Viyogi; S. Vokal; S. A. Voloshin; W. T. Waggoner; F. Wang; G. Wang; J. S. Wang; X. L. Wang; Y. Wang; J. W. Watson; J. C. Webb; G. D. Westfall; A. Wetzler; C. Whitten; H. Wieman; S. W. Wissink; R. Witt; J. Wood; N. Xu; Q. H. Xu; Z. Xu; P. Yepes; I.-K. Yoo; V. I. Yurevich; I. Zborovsky; W. Zhan; H. Zhang; W. M. Zhang; Y. Zhang; Z. P. Zhang; Y. Zhao; C. Zhong; R. Zoulkarneev; Y. Zoulkarneeva; A. N. Zubarev

2006-01-01

303

Absence of Suppression in Particle Production at Large Transverse Momentum in (sNN)=200 GeV d+Au Collisions  

Microsoft Academic Search

Transverse momentum spectra of charged hadrons with pT<8 GeV\\/c and neutral pions with pT<10 GeV\\/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in d+Au collisions at (sNN)=200 GeV. The measured yields are compared to those in p+p collisions at the same (sNN) scaled up by the number of underlying nucleon-nucleon collisions in d+Au. The yield

S. S. Adler; S. Afanasiev; C. Aidala; N. N. Ajitanand; Y. Akiba; A. Al-Jamel; J. Alexander; K. Aoki; L. Aphecetche; R. Armendariz; S. H. Aronson; R. Averbeck; T. C. Awes; V. Babintsev; A. Baldisseri; K. N. Barish; P. D. Barnes; B. Bassalleck; S. Bathe; S. Batsouli; V. Baublis; F. Bauer; A. Bazilevsky; S. Belikov; M. T. Bjorndal; J. G. Boissevain; H. Borel; M. L. Brooks; D. S. Brown; N. Bruner; D. Bucher; H. Buesching; V. Bumazhnov; G. Bunce; J. M. Burward-Hoy; S. Butsyk; X. Camard; P. Chand; W. C. Chang; S. Chernichenko; C. Y. Chi; J. Chiba; M. Chiu; I. J. Choi; R. K. Choudhury; T. Chujo; V. Cianciolo; Y. Cobigo; B. A. Cole; P. Constantin; M. Csanád; T. Csörgo; J. P. Cussonneau; D. D'Enterria; K. Das; G. David; F. Deák; H. Delagrange; A. Denisov; A. Deshpande; E. J. Desmond; A. Devismes; O. Dietzsch; J. L. Drachenberg; O. Drapier; A. Drees; A. Durum; D. Dutta; V. Dzhordzhadze; Y. V. Efremenko; H. En'yo; B. Espagnon; S. Esumi; D. E. Fields; C. Finck; F. Fleuret; S. L. Fokin; B. D. Fox; Z. Fraenkel; J. E. Frantz; A. Franz; A. D. Frawley; Y. Fukao; S.-Y. Fung; S. Gadrat; M. Germain; A. Glenn; M. Gonin; J. Gosset; Y. Goto; R. Granier de Cassagnac; N. Grau; S. V. Greene; M. Grosse Perdekamp; H.-Å. Gustafsson; T. Hachiya; J. S. Haggerty; H. Hamagaki; A. G. Hansen; E. P. Hartouni; M. Harvey; K. Hasuko; R. Hayano; X. He; M. Heffner; T. K. Hemmick; J. M. Heuser; P. Hidas; H. Hiejima; J. C. Hill; R. Hobbs; W. Holzmann; K. Homma; B. Hong; A. Hoover; T. Horaguchi; T. Ichihara; V. V. Ikonnikov; K. Imai; M. Inuzuka; D. Isenhower; L. Isenhower; M. Issah; A. Isupov; B. V. Jacak; J. Jia; O. Jinnouchi; B. M. Johnson; S. C. Johnson; K. S. Joo; D. Jouan; F. Kajihara; S. Kametani; N. Kamihara; M. Kaneta; J. H. Kang; K. Katou; T. Kawabata; A. Kazantsev; S. Kelly; B. Khachaturov; A. Khanzadeev; J. Kikuchi; D. J. Kim; E. Kim; B. Komkov; H. J. Kim; E. Kinney; A. Kozlov; E. Kistenev; A. Kiyomichi; C. Klein-Boesing; H. Kobayashi; V. Kochetkov; R. Kohara; M. Konno; D. Kotchetkov; P. J. Kroon; C. H. Kuberg; G. J. Kunde; K. Kurita; M. J. Kweon; Y. Kwon; G. S. Kyle; R. Lacey; J. G. Lajoie; Y. Le Bornec; A. Lebedev; S. Leckey; D. M. Lee; M. J. Leitch; M. A. Leite; X. Li; H. Lim; A. Litvinenko; M. X. Liu; C. F. Maguire; Y. I. Makdisi; A. Malakhov; V. I. Manko; Y. Mao; G. Martinez; H. Masui; F. Matathias; T. Matsumoto; M. C. McCain; P. L. McGaughey; Y. Miake; T. E. Miller; A. Milov; S. Mioduszewski; G. C. Mishra; J. T. Mitchell; A. K. Mohanty; J. M. Moss; D. Mukhopadhyay; M. Muniruzzaman; S. Nagamiya; J. L. Nagle; T. Nakamura; J. Newby; A. S. Nyanin; J. Nystrand; E. O'Brien; C. A. Ogilvie; H. Ohnishi; I. D. Ojha; H. Okada; K. Okada; A. Oskarsson; I. Otterlund; K. Oyama; K. Ozawa; D. Pal; A. P. Palounek; V. Pantuev; V. Papavassiliou; W. J. Park; S. F. Pate; H. Pei; V. Penev; J.-C. Peng; H. Pereira; V. Peresedov; A. Pierson; C. Pinkenburg; R. P. Pisani; M. L. Purschke; A. K. Purwar; J. Qualls; J. Rak; I. Ravinovich; K. F. Read; M. Reuter; K. Reygers; V. Riabov; Y. Riabov; G. Roche; A. Romana; M. Rosati; S. Rosendahl; P. Rosnet; V. L. Rykov; S. S. Ryu; N. Saito; T. Sakaguchi; S. Sakai; V. Samsonov; L. Sanfratello; R. Santo; H. D. Sato; S. Sato; S. Sawada; Y. Schutz; V. Semenov; R. Seto; T. K. Shea; I. Shein; T.-A. Shibata; K. Shigaki; M. Shimomura; A. Sickles; C. L. Silva; D. Silvermyr; K. S. Sim; A. Soldatov; R. A. Soltz; W. E. Sondheim; S. Sorensen; I. V. Sourikova; F. Staley; P. W. Stankus; E. Stenlund; M. Stepanov; A. Ster; S. P. Stoll; T. Sugitate; J. P. Sullivan; S. Takagi; E. M. Takagui; A. Taketani; K. H. Tanaka; Y. Tanaka; K. Tanida; M. J. Tannenbaum; A. Taranenko; P. Tarján; T. L. Thomas; M. Togawa; J. Tojo; H. Torii; R. S. Towell; V.-N. Tram; I. Tserruya; Y. Tsuchimoto; H. Tydesjö; N. Tyurin; T. J. Uam; H. W. van Hecke; J. Velkovska; M. Velkovsky; V. Veszprémi; A. A. Vinogradov; M. A. Volkov; E. Vznuzdaev; X. R. Wang; Y. Watanabe; S. N. White; N. Willis; F. K. Wohn; C. L. Woody; W. Xie; A. Yanovich; S. Yokkaichi; G. R. Young; I. E. Yushmanov; W. A. Zajc; C. Zhang; S. Zhou; J. Zimányi; L. Zolin; X. Zong

2003-01-01

304

Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at s NN = 2.76 TeV  

Microsoft Academic Search

Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sNN=2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0–5% and 70–80% of the hadronic Pb–Pb cross section. The measured charged particle spectra in |?|0.8 and 0.3pT20 GeV\\/c are compared to the expectation in pp collisions

K. Aamodt; A. Abrahantes Quintana; D. Adamová; A. M. Adare; M. M. Aggarwal; G. Aglieri Rinella; A. G. Agocs; S. Aguilar Salazar; Z. Ahammed; N. Ahmad; A. Ahmad Masoodi; S. U. Ahn; A. Akindinov; D. Aleksandrov; B. Alessandro; R. Alfaro Molina; A. Alici; A. Alkin; E. Almaráz Aviña; T. Alt; V. Altini; S. Altinpinar; I. Altsybeev; C. Andrei; A. Andronic; V. Anguelov; C. Anson; T. Anti?i?; F. Antinori; P. Antonioli; L. Aphecetche; H. Appelshäuser; N. Arbor; S. Arcelli; A. Arend; N. Armesto; R. Arnaldi; T. Aronsson; I. C. Arsene; A. Asryan; A. Augustinus; R. Averbeck; T. C. Awes; J. Äystö; M. D. Azmi; M. Bach; A. Badalà; Y. W. Baek; S. Bagnasco; R. Bailhache; R. Bala; R. Baldini Ferroli; A. Baldisseri; A. Baldit; J. Bán; R. Barbera; F. Barile; G. G. Barnaföldi; L. S. Barnby; V. Barret; J. Bartke; M. Basile; N. Bastid; B. Bathen; G. Batigne; B. Batyunya; C. Baumann; I. G. Bearden; H. Beck; I. Belikov; F. Bellini; R. Bellwied; E. Belmont-Moreno; S. Beole; I. Berceanu; A. Bercuci; E. Berdermann; Y. Berdnikov; L. Betev; A. Bhasin; A. K. Bhati; L. Bianchi; N. Bianchi; C. Bianchin; J. Biel?ík; J. Biel?íková; A. Bilandzic; E. Biolcati; A. Blanc; F. Blanco; D. Blau; C. Blume; M. Boccioli; N. Bock; A. Bogdanov; H. Bøggild; M. Bogolyubsky; L. Boldizsár; M. Bombara; C. Bombonati; H. Borel; C. Bortolin; S. Bose; F. Bossú; M. Botje; S. Böttger; B. Boyer; P. Braun-Munzinger; L. Bravina; M. Bregant; T. Breitner; M. Broz; R. Brun; E. Bruna; G. E. Bruno; D. Budnikov; H. Buesching; O. Busch; Z. Buthelezi; D. Caffarri; X. Cai; H. Caines; E. Calvo Villar; P. Camerini; V. Canoa Roman; G. Cara Romeo; F. Carena; W. Carena; F. Carminati; A. Casanova Díaz; M. Caselle; J. Castillo Castellanos; V. Catanescu; C. Cavicchioli; P. Cerello; B. Chang; S. Chapeland; J. L. Charvet; S. Chattopadhyay; M. Cherney; C. Cheshkov; B. Cheynis; E. Chiavassa; V. Chibante Barroso; D. D. Chinellato; P. Chochula; M. Chojnacki; P. Christakoglou; C. H. Christensen; P. Christiansen; T. Chujo; C. Cicalo; L. Cifarelli; F. Cindolo; J. Cleymans; F. Coccetti; J.-P. Coffin; S. Coli; G. Conesa Balbastre; Z. Conesa del Valle; P. Constantin; G. Contin; J. G. Contreras; T. M. Cormier; Y. Corrales Morales; I. Cortés Maldonado; P. Cortese; M. R. Cosentino; F. Costa; M. E. Cotallo; E. Crescio; P. Crochet; E. Cuautle; L. Cunqueiro; G. D. Erasmo; A. Dainese; H. H. Dalsgaard; A. Danu; D. Das; I. Das; A. Dash; S. Dash; S. De; A. De Azevedo Moregula; G. O. V. de Barros; A. De Caro; G. de Cataldo; J. de Cuveland; A. De Falco; D. De Gruttola; N. De Marco; S. De Pasquale; R. De Remigis; R. de Rooij; H. Delagrange; Y. Delgado Mercado; G. Dellacasa; A. Deloff; V. Demanov; E. Dénes; A. Deppman; D. Di Bari; C. Di Giglio; S. Di Liberto; A. Di Mauro; P. Di Nezza; T. Dietel; R. Divià; Ø. Djuvsland; A. Dobrin; T. Dobrowolski; I. Domínguez; B. Dönigus; O. Dordic; O. Driga; A. K. Dubey; J. Dubuisson; L. Ducroux; P. Dupieux; A. K. Dutta Majumdar; M. R. Dutta Majumdar; D. Elia; D. Emschermann; H. Engel; H. A. Erdal; B. Espagnon; M. Estienne; S. Esumi; D. Evans; S. Evrard; G. Eyyubova; C. W. Fabjan; D. Fabris; J. Faivre; D. Falchieri; A. Fantoni; M. Fasel; R. Fearick; A. Fedunov; D. Fehlker; V. Fekete; D. Felea; G. Feofilov; A. Fernández Téllez; A. Ferretti; R. Ferretti; M. A. S. Figueredo; S. Filchagin; R. Fini; D. Finogeev; F. M. Fionda; E. M. Fiore; M. Floris; S. Foertsch; P. Foka; S. Fokin; E. Fragiacomo; M. Fragkiadakis; U. Frankenfeld; U. Fuchs; F. Furano; C. Furget; M. Fusco Girard; J. J. Gaardhøje; S. Gadrat; M. Gagliardi; A. Gago; M. Gallio; P. Ganoti; C. Garabatos; R. Gemme; J. Gerhard; M. Germain; C. Geuna; A. Gheata; M. Gheata; B. Ghidini; P. Ghosh; M. R. Girard; G. Giraudo; P. Giubellino; E. Gladysz-Dziadus; P. Glässel; R. Gomez; L. H. González-Trueba; P. González-Zamora; H. González Santos; S. Gorbunov; S. Gotovac; V. Grabski; R. Grajcarek; A. Grelli; A. Grigoras; C. Grigoras; V. Grigoriev; A. Grigoryan; S. Grigoryan; B. Grinyov; N. Grion; P. Gros; J. F. Grosse-Oetringhaus; J.-Y. Grossiord; R. Grosso; F. Guber; R. Guernane; C. Guerra Gutierrez; B. Guerzoni; K. Gulbrandsen; T. Gunji; A. Gupta; R. Gupta; H. Gutbrod; Ø. Haaland; C. Hadjidakis; M. Haiduc; H. Hamagaki; G. Hamar; J. W. Harris; M. Hartig; D. Hasch; D. Hasegan; D. Hatzifotiadou; A. Hayrapetyan; M. Heide; M. Heinz; H. Helstrup; A. Herghelegiu; C. Hernández; G. Herrera Corral; N. Herrmann; K. F. Hetland; B. Hicks; P. T. Hille; B. Hippolyte; T. Horaguchi; Y. Hori; P. Hristov; I. H?ivná?ová; M. Huang; S. Huber; T. J. Humanic; D. S. Hwang; R. Ichou; R. Ilkaev; I. Ilkiv; M. Inaba; E. Incani; G. M. Innocenti; P. G. Innocenti; M. Ippolitov; M. Irfan; C. Ivan; A. Ivanov; M. Ivanov; V. Ivanov; A. Jacho?kowski; P. M. Jacobs; L. Jancurová; S. Jangal; R. Janik; S. P. Jayarathna; S. Jena; L. Jirden; G. T. Jones; P. G. Jones

2011-01-01

305

Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs  

NASA Astrophysics Data System (ADS)

We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 ?0/s and the measured white flux noise was 1.3 ??0/?Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.

Podt, M.; Flokstra, J.; Rogalla, H.

2002-08-01

306

Disentangling full and partial linear momentum transfer events in the {sup 16}O+{sup 169}Tm system at E{sub proj}{<=}5.4 MeV/nucleon  

SciTech Connect

Forward recoil ranges of heavy reaction products have been measured to disentangle full and/or partial linear momentum transfer events in the {sup 16}O+{sup 169}Tm system at E{sub proj}{approx_equal}76 and 81 MeV. The experimentally measured forward recoil ranges of complete and/or incomplete fusion products are found to be in satisfactory agreement with that estimated using range-energy formulations. The angular distributions of several heavy reaction products have also been measured at E{sub proj}{approx_equal}81 MeV to get complementary information about incomplete fusion. To figure out the influence of incomplete fusion on complete fusion at such low projectile energies, the relative strengths of their contributions in {alpha}-emitting channel(s) have been deduced from the measurement of recoil range distributions.

Gupta, Unnati; Singh, Pushpendra P.; Singh, Devendra P.; Sharma, Manoj Kumar; Yadav, Abhishek; Singh, B. P.; Prasad, R. [Accelerator Laboratory, Department of Physics, A. M. University, Aligarh 202 002 (India); Kumar, R. [NP-Group, Inter University Accelerator Center (IUAC), Post Office Box 10502, New Delhi (India); Gupta, S. [Department of Physics, Agra College, Agra (India); Bhardwaj, H. D. [Department of Physics, DSN College, Unnao (India)

2009-08-15

307

Measurements of the Proton Elastic-Form-Factor Ratio {mu}{sub p}G{sub E}{sup p}/G{sub M}{sup p} at Low Momentum Transfer  

SciTech Connect

High-precision measurements of the proton elastic form-factor ratio, {mu}{sub p}G{sub E}{sup p}/G{sub M}{sup p}, have been made at four-momentum transfer, Q{sup 2}, values between 0.2 and 0.5 GeV{sup 2}. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q{sup 2} range the deviation from unity is primarily due to G{sub E}{sup p} being smaller than expected.

Ron, G.; Piasetzky, E.; Pomerantz, I.; Shneor, R. [Tel Aviv University, Tel Aviv 69978 (Israel); Glister, J. [Saint Mary's University, Halifax, Nova Scotia B3H 3C3 (Canada); Dalhousie University, Halifax, Nova Scotia B3H 3J5 (Canada); Lee, B.; Choi, Seonho; Kang, H.; Oh, Y.; Song, J.; Yan, X. [Seoul National University, Seoul 151-747, Korea (Korea, Republic of); Allada, K.; Dutta, C. [University of Kentucky, Lexington, Kentucky 40506 (United States); Armstrong, W.; Meziani, Z.-E.; Yao, H. [Temple University, Philadelphia, Pennsylvania 19122 (United States); Arrington, J.; Solvignon, P. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Beck, A.; May-Tal Beck, S. [NRCN, Beer-Sheva 84190 (Israel)] (and others)

2007-11-16

308

Angular Momentum Experiment  

NSDL National Science Digital Library

After using the historical development of concepts of conserved motion to develop introductory understanding, students are directed to a series of activities to gain a better understanding of momentum, conservation of momenta, angular momentum, and conservation of angular momenta.

Trapp, David

309

Centrality Dependence of {pi}{sup 0} and {eta} Production at Large Transverse Momentum in {radical}(s{sub NN})=200 GeV d+Au Collisions  

SciTech Connect

The dependence of transverse momentum spectra of neutral pions and {eta} mesons with p{sub T}<16 GeV/c and p{sub T}<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) in d+Au collisions at {radical}(s{sub NN})=200 GeV. The measured yields are compared to those in p+p collisions at the same {radical}(s{sub NN}) scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at RHIC. Only a weak p{sub T} and centrality dependence can be observed.

Adler, S. S.; Aronson, S. H.; Chujo, T.; David, G.; Desmond, E. J.; Franz, A.; Haggerty, J. S.; Harvey, M.; Johnson, B. M.; Kistenev, E.; Kroon, P. J.; Makdisi, Y. I.; Mioduszewski, S.; Mitchell, J. T.; Morrison, D. P.; O'Brien, E.; Pinkenburg, C.; Pisani, R. P.; Purschke, M. L.; Shea, T. K. [Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)] (and others)

2007-04-27

310

Centrality Dependence of {pi}0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions  

SciTech Connect

The dependence of transverse momentum spectra of neutral pions and {eta} mesons with p{sub T}<16 GeV/c and p{sub T}<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) in d+Au collisions at {radical}s{sub NN}=200 GeV. The measured yields are compared to those in p+p collisions at the same {radical}s{sub NN} scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at RHIC. Only a weak pT and centrality dependence can be observed.

Awes, Terry C [ORNL; Batsouli, Sotiria [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL); Cianciolo, Vince [ORNL; Efremenko, Yuri [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL); Plasil, F [ORNL; Read Jr, Kenneth F [ORNL; Silvermyr, David O [ORNL; Sorensen, Soren P [University of Tennessee, Knoxville (UTK); Stankus, Paul W [ORNL; Young, Glenn R [ORNL; Zhang, Chun [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL); PHENIX, Collaboration [The

2007-04-01

311

Momentum Distribution and Final State Effects in Liquid Neon  

Microsoft Academic Search

We report high precision inelastic neutron scattering measurements in liquid Neon at a temperature of 25.8 K and saturated vapour pressure. The data covers a wide range of energy and momentum transfer (2 ??1 ? Q ? 13 ??1). The atomic momentum distribution, n(p), and final state effects (FSE) can be readily extracted from this intermediate wavevector transfer data provided

R. T. Azuah; W. G. Stirling; H. R. Glyde; M. Boninsegni

1997-01-01

312

Momentum Coupling to NEO's  

NASA Astrophysics Data System (ADS)

We considered the coupling of momentum to near-Earth objects (NEO's) for the purposes of collision avoidance or collision damage mitigation through trajectory modification. The momentum sources considered were pulsed lasers, kinetic energy impactors, and nuclear (or conventional) explosives, detonated above or below the surface of the NEO by the nonnuclear and nuclear momentum sources listed above. We did not address the system tradeoffs or the environmental implications of momentum source delivery.

Shafer, B. P.; Garcia, M. D.; Managan, R. A.; Remo, John L.; Rosenkilde, C. E.; Scammon, R. J.; Snell, C. M.; Stellingwerf, R. F.

1997-05-01

313

Factors affecting success of embryo collection and transfer in large dairy herds.  

PubMed

Our objective was to evaluate factors that affected the success of embryo transfer programs in large dairy herds. Non-lactating donor cows produced a larger number of ova/embryos (P<0.01) and viable embryos (P<0.01) than lactating cows. The interaction between season and donor class was correlated with the proportion of ova/embryos classified as fertilized (P=0.03), because lactating donors had fewer fertilized ova in the summer. There was no correlation between 305-day mature equivalent milk yield and response to superstimulation. Although the interval between superstimulation protocols was correlated with the number of ova/embryos (P=0.03), there was no correlation with the number of viable embryos. Pregnancy per embryo transfer (P/ET) in heifer recipients was correlated with embryo quality grade (P<0.01), season (P=0.04), and whether embryos were fresh or frozen/thawed (P<0.01). Lactating recipient cows tended to have a lower rate of P/ET during the summer (P=0.12 to P=0.08). Synchronization protocols tended to be (P=0.06; Herd 1) or were (P=0.02; Herd 2) correlated with P/ET. Lactating cows receiving vitrified IVF embryos had a lower (P=0.01) P/ET than those receiving fresh IVF embryos, especially in the summer (P=0.09). Milk yield was not correlated with P/ET. The use of heat abatement systems is critical to improve embryo production and P/ET. Synchronization protocols that optimized synchrony of ovulation may increase fertility of recipient cows and eliminate the need for estrous detection. PMID:18023856

Chebel, R C; Demétrio, D G B; Metzger, J

2007-11-19

314

496. Recombinant Sendai Virus Vector to Evaluate Vector Distribution in a Large Animal Model of Lung Gene Transfer  

Microsoft Academic Search

We have described gene delivery in sheep as a large animal model for airway gene transfer. This model allows comparison of different GTAs in terms of efficacy and safety using doses, delivery methods and assays, relevant to human studies. Proof-of-principle for non-viral gene transfer has been established however, levels of transgene expression are too low on a per cell basis

Gerry McLachlan; Uta Griesenbach; Toshi Owaki; Liz Hillery; John Williams; Zhu Yafeng; Chris Boyd; Deborah Gill; Mamoru Hasegawa; Eric W. F. W. Alton; David Collie

2004-01-01

315

Introducing Electromagnetic Field Momentum  

ERIC Educational Resources Information Center

|I describe an elementary way of introducing electromagnetic field momentum. By considering a system of a long solenoid and line charge, the dependence of the field momentum on the electric and magnetic fields can be deduced. I obtain the electromagnetic angular momentum for a point charge and magnetic monopole pair partially through dimensional…

Hu, Ben Yu-Kuang

2012-01-01

316

Momentum Coupling to NEO's  

Microsoft Academic Search

We considered the coupling of momentum to near-Earth objects (NEO's) for the purposes of collision avoidance or collision damage mitigation through trajectory modification. The momentum sources considered were pulsed lasers, kinetic energy impactors, and nuclear (or conventional) explosives, detonated above or below the surface of the NEO by the nonnuclear and nuclear momentum sources listed above. We did not address

B. P. Shafer; M. D. Garcia; R. A. Managan; John L. Remo; C. E. Rosenkilde; R. J. Scammon; C. M. Snell; R. F. Stellingwerf

1997-01-01

317

Force and Momentum  

Microsoft Academic Search

IT is commonly said that change of momentum is evidence that force has acted or is acting on the mass, and that the rate at which the momentum is changing is the measure of the force. Thus, in his lecture on ``Force'', Prof. Tait says: ``Force is the rate of change of momentum'' (NATURE, vol. xiv. p. 462). This is

E. G

1879-01-01

318

VARIABLE MOMENTUM COMPACTION LATTICE STUDIES.  

SciTech Connect

The VUV storage ring at the National Synchrotron Light Source was used to study the impact of changes in the momentum compaction factors over a large range from positive to negative values. Changes in bunch length and synchrotron tune were measured versus current and RF parameters for these different lattices. By controlling both the first and second-order momentum compaction factors, a lattice was developed in which a pair of alpha buckets was created within the energy aperture of the vacuum chamber and beam was stored simultaneously in both buckets.

KRAMER,S.; MURPHY,J.B.

1999-03-29

319

Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton-proton collision data with the ATLAS detector  

NASA Astrophysics Data System (ADS)

A search for events with large missing transverse momentum, jets, and at least two tau leptons has been performed using 2 fb-1 of proton-proton collision data at s=7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% CL upper limit on the visible cross section for new phenomena is set, where the visible cross section is defined by the product of cross section, branching fraction, detector acceptance and event selection efficiency. A 95% CL lower limit of 32 TeV is set on the gauge-mediated supersymmetry breaking (GMSB) scale ? independent of tan ?. These limits provide the most stringent tests to date in a large part of the considered parameter space.

ATLAS Collaboration Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Aliyev, M.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amaral, P.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amorós, G.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Astvatsatourov, A.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Ay, C.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barashkou, A.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendel, M.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertinelli, F.; Bertolucci, F.; Besana, M. I.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Bondarenko, V. G.; Bondioli, M.; Boonekamp, M.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Braem, A.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodbeck, T. J.; Brodet, E.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.

2012-08-01

320

Search for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 7 TeV proton-proton collision data with the ATLAS detector  

NASA Astrophysics Data System (ADS)

A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, and at least one hadronically decaying ? lepton, with zero or one additional light lepton ( e/ ?), has been performed using 4.7 fb-1 of proton-proton collision data at sqrt{s} = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95 % confidence level visible cross-section upper limit for new phenomena is set. In the framework of gauge-mediated SUSY-breaking models, lower limits on the mass scale ? are set at 54 TeV in the regions where the tilde{tau}1 is the next-to-lightest SUSY particle (tan ?>20). These limits provide the most stringent tests to date of GMSB models in a large part of the parameter space considered.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M.-L.; Anduaga, X. S.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Balek, P.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bittner, B.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.

2012-11-01

321

Investigation of color transparency by high transverse momentum pp elastic scattering inside nuclei  

SciTech Connect

Following a suggestion of Mueller and Brodsky, we have measured (p, 2p) quasielastic scattering in nuclei at 90(degree) CM at momentum transfers of Q/sup 2/ = 4.8, 8.5 and 10.4 (GeV/c)/sup 2/. In a perturbative QCD model of large transverse momentum exclusive reactions, the hadrons which scatter are anomalously ''small,'' and hence have a reduced absorption in nuclear matter over distances comparable to nuclear radii. At sufficiently high momentum, the absorption should vanish completely and lead to complete ''color transparency.'' The absorption of the initial and final state protons as they pass through nuclear matter is determined from the ratio of the differential cross section for elastic scattering from protons in nuclei to that from free protons. The kinematic constraints of the experiment allow a clear extraction of the (p,2p) quasielastic signal, and a good measurement of the target proton momentum spectrum as probed by large momentum transfers. In contrast to a conventional Glauber picture of constant transparency, a striking energy dependence is observed in this experiment. 11 refs., 4 figs.

Barton, D.S.; Bunce, G.; Carroll, A.S.; Gushue, S.; Makdisi, Y.I.; Heppelmann, S.; Courant, H.; Fang, G.Y.; Heller, K.J.; Marshak, M.L.

1989-01-01

322

Neoclassical Angular Momentum Flux Revisited  

NASA Astrophysics Data System (ADS)

The toroidal angular momentum flux in neoclassical transport theory of small rotations depends on the second order (in ion poloidal gyroradius over plasma scale length) ion distribution function. Owing to the complexity of the calculation, the result obtained a long time ago for circular cross-section tokamak plasmas in the banana regime [M.N. Rosenbluth, et al., Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1971), Vol. 1, p. 495] has never been reproduced. Using a representation of the angular momentum flux based on the solution of an adjoint equation to the usual linearized drift kinetic equation, and performing systematically a large-aspect-ratio expansion, we have obtained the flux for flux surfaces of arbitrary shape. We have found the same analytic form for the temperature gradient driven part of the flux, but the overall numerical multiplier is different and has the opposite sign. Implications for rotations in discharges with no apparent momentum input will be discussed.

Wong, S. K.; Chan, V. S.

2004-11-01

323

Planar three-coordinate high-spin Fe(II) complexes with large orbital angular momentum: Mössbauer, electron paramagnetic resonance, and electronic structure studies.  

PubMed

Mössbauer spectra of [LFe(II)X](0) (L = beta-diketiminate; X = Cl(-), CH(3)(-), NHTol(-), NHtBu(-)), 1.X, were recorded between 4.2 and 200 K in applied magnetic fields up to 8.0 T. A spin Hamiltonian analysis of these data revealed a spin S = 2 system with uniaxial magnetization properties, arising from a quasi-degenerate M(S) = +/-2 doublet that is separated from the next magnetic sublevels by very large zero-field splittings (3/D/ > 150 cm(-1)). The ground levels give rise to positive magnetic hyperfine fields of unprecedented magnitudes, B(int) = +82, +78, +72, and +62 T for 1.CH(3), 1.NHTol, 1.NHtBu, and 1.Cl, respectively. Parallel-mode EPR measurements at X-band gave effective g values that are considerably larger than the spin-only value 8, namely g(eff) = 10.9 (1.Cl) and 11.4 (1.CH(3)), suggesting the presence of unquenched orbital angular momenta. A qualitative crystal field analysis of g(eff) shows that these momenta originate from spin-orbit coupling between energetically closely spaced yz and z(2) 3d-orbital states at iron and that the spin of the M(S) = +/-2 doublet is quantized along x, where x is along the Fe-X vector and z is normal to the molecular plane. A quantitative analysis of g(eff) provides the magnitude of the crystal field splitting of the lowest two orbitals, /epsilon(yz) - epsilon(2)(z)/ = 452 (1.Cl) and 135 cm(-1) (1.CH(3)). A determination of the sign of the crystal field splitting was attempted by analyzing the electric field gradient (EFG) at the (57)Fe nuclei, taking into account explicitly the influence of spin-orbit coupling on the valence term and ligand contributions. This analysis, however, led to ambiguous results for the sign of epsilon(yz) - epsilon(2)(z). The ambiguity was resolved by analyzing the splitting Delta of the M(S) = +/-2 doublet; Delta = 0.3 cm(-1) for 1.Cl and Delta = 0.03 cm(-)(1) for 1.CH(3). This approach showed that z(2) is the ground state in both complexes and that epsilon(yz) - epsilon(2)(z) approximately 3500 cm(-1) for 1.Cl and 6000 cm(-1) for 1.CH(3). The crystal field states and energies were compared with the results obtained from time-dependent density functional theory (TD-DFT). The isomer shifts and electric field gradients in 1.X exhibit a remarkably strong dependence on ligand X. The ligand contributions to the EFG, denoted W, were expressed by assigning ligand-specific parameters: W(X) to ligands X and W(N) to the diketiminate nitrogens. The additivity and transferability hypotheses underlying this model were confirmed by DFT calculations. The analysis of the EFG data for 1.X yields the ordering W(N(diketiminate)) < W(Cl) < W(N'HR), W(CH(3)) and indicates that the diketiminate nitrogens perturb the iron wave function to a considerably lesser extent than the monodentate nitrogen donors do. Finally, our study of these synthetic model complexes suggests an explanation for the unusual values for the electric hyperfine parameters of the iron sites in the Fe-Mo cofactor of nitrogenase in the M(N) state. PMID:11902893

Andres, Hanspeter; Bominaar, Emile L; Smith, Jeremy M; Eckert, Nathan A; Holland, Patrick L; Münck, Eckard

2002-03-27

324

Angular and linear momentum of excited ferromagnets  

NASA Astrophysics Data System (ADS)

The angular momentum vector of a Heisenberg ferromagnet with isotropic exchange interaction is conserved, while under uniaxial crystalline anisotropy the projection of the total spin along the easy axis is a constant of motion. Using Noether's theorem, we prove that these conservation laws persist in the presence of dipole-dipole interactions. However, spin and orbital angular momentum are no longer conserved separately. We also define the linear momentum of ferromagnetic textures. We illustrate the general principles with special reference to spin transfer torques and identify the emergence of a nonadiabatic effective field acting on domain walls in ferromagnetic insulators.

Yan, Peng; Kamra, Akashdeep; Cao, Yunshan; Bauer, Gerrit E. W.

2013-10-01

325

Large Amplitude Motions and Information Transfer Along Conjugated Bonds: the Case of Paratolualdehyde  

NASA Astrophysics Data System (ADS)

Historically, barriers to large amplitude motions are often related, using steric hinderance arguments, to the local atom arrangement. More recently, large changes have been found in the barrier inhibiting methyl rotation, when electronic excitation or ionization of a substituted toluene occurs, suggesting molecular orbital occupancy as a dominant factor in aromatic molecules. Theoretically, the relation can also be made to the molecular orbital and electron density structure. Experimentally, we examine the situation by comparing toluene with paratolualdehyde. In particular, the barrier in toluene, CH3-C6H5, is six-fold by symmetry. In paratolualdehyde, CH3-C6H4-CHO, the aldehyde group is far enough from the methyl rotor that direct through-space interactions should be rather small. Thus, a three-fold contribution to the barrier would leave electron orbital effects in the ?-system as the primary causal agent. Microwave spectroscopy is well suited for discriminating between V3 and V6 contributions - but only if torsionally exited states can be accessed which typically requires temperatures much higher that than those encountered in pulsed-jet expansions. Thus, the supersonic-jet FT-MW spectrometers in Hannover and Gaithersburg as well as the free-jet CW mm-wave spectrometer in Bologna were needed to take the spectra. Analyzing 5 torsional species using the Belgi program, the barrier was found to vastly be dominated by the V3 vs. a minor V6 contribution, thus revealing the information transfer though conjugated ?-electron systems. L. H. Spangler, J Rev. Phys. Chem. 48 (1997) 481-510

Saal, Hilkka; Grabow, Jens-Uwe; Hight-Walker, Angela R.; Hougen, Jon T.; Caminati, Walther; Kleiner, Isabelle

2010-06-01

326

Large-eddy simulation of heat transfer from impinging slot jets  

SciTech Connect

Impinging jet flows have become a well-established object of investigation in recent years because of their increasing significance in both fundamental and applied fluid mechanics. Examples of a wide range of applications, are the drying of textiles, film, and paper; annealing of glass; processing of some metals and glass; cooling of gas turbine components and the outer wall of combustors and electronic equipment; and freezing of tissue. Here Nusselt number distributions are presented for impinging jet flow of an array of slot nozzles (rectangular jets). The tools to calculate the present turbulent flow are large-eddy simulation (LES) using a dynamic subgrid stress model and the direct numerical simulation (DNS). The numerical code has been validated by comparing computed Nusselt number distributions on the impingement plate for two-dimensional flow with experimental results. A comparison between LES using a logarithmic law of the wall and the DNS shows good agreement of Nusselt number in the Reynolds number range of 600--3,000. The velocity profile at the feed tube exit strongly influences the maximum heat transfer at the stagnation point.

Cziesla, T.; Tandogan, E.; Mitra, N.K. [Ruhr-Universitaet, Bochum (Germany). Inst. fuer Thermo- und Fluiddynamik

1997-07-01

327

Facile phase transfer of large, water-soluble metal nanoparticles to nonpolar solvents.  

PubMed

The facile phase-transfer of large, water-soluble metal nanoparticles to nonpolar solvent is reported here. Thiol-terminated polystyrene (PS-SH) is ligand-exchanged onto water-soluble metal nanoparticles in single-phase acetone/water mixtures, generating a precipitate. The solvent is then removed and the particles are redissolved in nonpolar solvent. This approach is demonstrated for nanoparticles of different metal (Au and Ag), size (3 to >100 nm), shape (spheres, rods, and wires, etc.), and leaving ligand (citrate, cetyltrimethylammonium bromide, poly(vinylpyrrolidone), and 4-dimethylaminopyridine. The resulting PS-SH-stabilized nanoparticles maintain their initial size and shape, and are highly stable. They are soluble in various organic solvents (toluene, benzene, chloroform, dichloromethane, and tetrahydrofuran), and can be readily dried, purified, and re-dissolved. This method makes possible the utilization of a full range of existing nanoparticle cores in nonpolar solvents with a single ligand. It provides access to numerous nanomaterials that cannot be obtained through direct synthesis in nonpolar solvent, and is expected to be of significant value in a number of applications. PMID:22283327

Goulet, Paul J G; Bourret, Gilles R; Lennox, R Bruce

2012-01-27

328

Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV  

SciTech Connect

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at {radical}s{sub NN} = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0--5% and 70-80% of the hadronic Pb-PB cross section. The measured charged particle spectra in |{eta}| < 0.8 and 0.3 < p{sub T} < 20 GeV/c are compared to the expectation in pp collisions at the same {radical}s{sub NN}, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor R{sub AA}. The result indicates only weak medium effects (R{sub AA} {approx} 0.7) in peripheral collisions. In central collisions, R{sub AA} reaches a minimum of about 0.14 at p{sub T} = 6--7 GeV/c and increases significantly at larger p{sub T}. The measured suppression of high-p{sub T} particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.

Aamodt, K. [University of Oslo, Norway; Awes, Terry C [ORNL; Read Jr, Kenneth F [ORNL; Silvermyr, David O [ORNL; ALICE, Collaboration [The

2011-01-01

329

On the calculation of momentum, heat, and mass transfer in laminar and turbulent boundary layer flows along a vaporizing liquid film  

NASA Astrophysics Data System (ADS)

A numerical method is presented for predicting the laminar and turbulent flow of a binary gas mixture along a plane vaporizing liquid film. The shear layer flow including the heat and mass transfer at the gas-liquid interface is described by a system of boundary-layer equations. Each of the parabolic equations is numerically solved using an implicit finite-difference method of Hermitian type. However, the overall solution procedure handles the coupled differential equations together with the boundary conditions in an explicit manner. Polynomials in terms of temperature are used to approximate the physical properties of the gas components at 1 atm pressure. Turbulence is accounted for by the algebraic eddy viscosity approach of Cebeci and Smith. The accuracy and efficiency of the numerical procedure developed is demonstrated for various temperatures of the external flow. A comparison of the numerical results with measurements in terms of flow profiles and Stanton numbers indicates good agreement.

Schroeppel, J.; Thiele, F.

1983-12-01

330

Do Waves Carrying Orbital Angular Momentum Possess Azimuthal Linear Momentum?  

NASA Astrophysics Data System (ADS)

All beams are a superposition of plane waves, which carry linear momentum in the direction of propagation with no net azimuthal component. However, plane waves incident on a hologram can produce a vortex beam carrying orbital angular momentum that seems to require an azimuthal linear momentum, which presents a paradox. We resolve this by showing that the azimuthal momentum is not a true linear momentum but the azimuthal momentum density is a true component of the linear momentum density.

Speirits, Fiona C.; Barnett, Stephen M.

2013-09-01

331

27 CFR 478.40a - Transfer and possession of large capacity ammunition feeding devices.  

Code of Federal Regulations, 2010 CFR

...possession of large capacity ammunition feeding devices. 478.40a Section 478...of large capacity ammunition feeding devices. (a) Prohibition. No...possess a large capacity ammunition feeding device. (b) Exceptions....

2009-04-01

332

27 CFR 478.40a - Transfer and possession of large capacity ammunition feeding devices.  

Code of Federal Regulations, 2010 CFR

...possession of large capacity ammunition feeding devices. 478.40a Section 478...of large capacity ammunition feeding devices. (a) Prohibition. No...possess a large capacity ammunition feeding device. (b) Exceptions....

2010-04-01

333

Mass transfer into viscous pseudoplastic liquid in large-diameter bubble columns  

Microsoft Academic Search

In pseudoplastic aqueous solutions of polysaccharides (xanthan, hydroxypropyl guar), hydrodynamics and oxygen mass transfer were studied in bubble columns of 0.19 m, 0.29 m and 0.60 m diameter (0.08 to 1.6 m3 liquid volume). Churn-turbulent flow prevailed; a slight diameter effect on the gas hold-up was observed only at high viscosity in the smaller columns. The volumetric mass transfer coefficients

H. Eickenbusch; P.-O. Brunn; A. Schumpe

1995-01-01

334

Frequency of horizontal gene transfer of a large catabolic plasmid (pJP4) in soil.  

PubMed Central

Limited work has been done to assess the bioremediation potential of transfer of plasmid-borne degradative genes from introduced to indigenous organisms in the environment. Here we demonstrate the transfer by conjugation of the catabolic plasmid pJP4, using a model system with donor and recipient organisms. The donor organism was Alcaligenes eutrophus JMP134 and the recipient organism was Variovorax paradoxus isolated from a toxic waste site. Plasmid pJP4 contains genes for mercury resistance and 2,4-dichlorophenoxyacetic (2,4-D) acid degradation. A transfer frequency of approximately 1/10(3) donor and recipient cells (parent cells) was observed on solid agar media, decreasing to 1/10(5) parent cells in sterile soil and finally 1/10(6) parent cells in 2,4-D-amended, nonsterile soil. Presumptive transconjugants were confirmed to be resistant to Hg, to be capable of degrading 2,4-D, and to contain a plasmid of size comparable to that of pJP4. In addition, we confirmed the transfer through PCR amplifications of the tfdB gene. Although transfer of pJP4 did occur at a high frequency in pure culture, the rate was significantly decreased by the introduction of abiotic (sterile soil) and biotic (nonsterile soil) stresses. An evaluation of the data from this model system implies that the reliance on plasmid transfer from a donor organism as a remediative strategy has limited potential.

Neilson, J W; Josephson, K L; Pepper, I L; Arnold, R B; Di Giovanni, G D; Sinclair, N A

1994-01-01

335

Intermittency of gravity-wave momentum flux in the stratosphere  

NASA Astrophysics Data System (ADS)

Atmospheric gravity waves transfer energy and momentum from the troposphere to upper layers of the atmosphere. They significantly contribute to forcing the global-scale Brewer Dobson circulation in the middle atmosphere, and to driving the stratosphere out of radiative equilibrium. As most of the gravity waves are not explicitly resolved in current climate models, their effects on the general circulation must be parameterized. Strong assumptions are generally used in such parameterizations, like for instance constant and homogeneous non-orographic gravity-wave sources. In this study, we challenge this latter hypothesis, and use long-duration balloon- and space-borne observations as well as mesoscale numerical simulations to characterize the intermittency of gravity waves in the lower stratosphere above Antarctica. This is achieved through working on the gravity-wave momentum-flux probability density functions (pdfs) obtained with these three datasets. The pdfs consistently exhibit long tails associated with the occurrence of rare and large amplitude events. We provide a measure of the contribution of these events to the total gravity-wave momentum flux, and show that only a small fraction of the wavepackets are responsible for most of the momentum transport during the winter regime of the stratospheric circulation. On the other hand, the wave intermittency significantly decreases when stratospheric easterlies develop in late spring and summer. With the exception of mountainous areas in winter, the momentum-flux pdfs furthermore tend to behave like lognormal distributions. We find that this behaviour can result from the propagation of a wave spectrum into a varying background wind field that generates the occurrence of frequent critical levels.

Hertzog, A.; Alexander, M. J.; Plougonven, R.

2012-04-01

336

Electron Scattering From High-Momentum Neutrons in Deuterium  

SciTech Connect

We report results from an experiment measuring the semi-inclusive reaction D(e,e'p{sub s}) where the proton p{sub s} is moving at a large angle relative to the momentum transfer. If we assume that the proton was a spectator to the reaction taking place on the neutron in deuterium, the initial state of that neutron can be inferred. This method, known as spectator tagging, can be used to study electron scattering from high-momentum (off-shell) neutrons in deuterium. The data were taken with a 5.765 GeV electron beam on a deuterium target in Jefferson Laboratory's Hall B, using the CLAS detector. A reduced cross section was extracted for different values of final-state missing mass W*, backward proton momentum {rvec p}{sub s} and momentum transfer Q{sup 2}. The data are compared to a simple PWIA spectator model. A strong enhancement in the data observed at transverse kinematics is not reproduced by the PWIA model. This enhancement can likely be associated with the contribution of final state interactions (FSI) that were not incorporated into the model. A ''bound neutron structure function'' F{sub 2n}{sup eff} was extracted as a function of W* and the scaling variable x* at extreme backward kinematics, where effects of FSI appear to be smaller. For p{sub s} > 400 MeV/c, where the neutron is far off-shell, the model overestimates the value of F{sub 2n}{sup eff} in the region of x* between 0.25 and 0.6. A modification of the bound neutron structure function is one of possible effects that can cause the observed deviation.

A.V. Klimenko; S.E. Kuhn

2005-10-12

337

Dynamic subgrid-scale models for momentum and scalar fluxes in large-eddy simulations of neutrally stratified atmospheric boundary layers over heterogeneous terrain  

Microsoft Academic Search

The accuracy of large-eddy simulations (LESs) of the atmospheric boundary layer (ABL) over complex terrain relies on the ability of the subgrid-scale (SGS) models to capture the effect of subgrid turbulent fluxes on the resolved fields of velocity and scalars (e.g., heat, water vapor, and pollutants). A common approach consists of parameterizing the SGS stresses and fluxes using eddy viscosity

Rob Stoll; Fernando Porté-Agel

2006-01-01

338

Introducing conservation of momentum  

NASA Astrophysics Data System (ADS)

The teaching of the principle of conservation of linear momentum is considered (ages 15 + ). From the principle, the momenta of two masses in an isolated system are considered. Sketch graphs of the momenta make Newton’s laws appear obvious. Examples using different collision conditions are considered. Conservation of momentum is considered for the case of a car hitting a child.

Brunt, Marjorie; Brunt, Geoff

2013-09-01

339

Conservation of Momentum 1  

NSDL National Science Digital Library

This lab introduces students to the idea of recoil and how conservation of momentum can be used to explain it. Many people use action/reaction to explain recoil, but conservation of momentum can be used equally well. Before shooting a gun, there is zero m

Horton, Michael

2009-05-30

340

"A Hand Hold for a Little Bit": Factors Facilitating the Success of Community College Transfer Students to a Large Research University  

ERIC Educational Resources Information Center

To understand factors affecting the academic and social integration of community college transfer students, we interviewed 19 students who transferred to one state's large Research-Extensive university. We inquired about the transfer process, efforts of the university to orient and assist them, and perceptions of the university versus the…

Townsend, Barbara K.; Wilson, Kristin

2006-01-01

341

Precision measurement of longitudinal and transverse response functions of quasi-elastic electron scattering in the momentum transfer range 0.55GeV/c lte math| lte 0.9GeV/c  

SciTech Connect

In order to test the Coulomb sum rule in nuclei, a precision measurement of inclusive electron scattering cross sections in the quasi-elastic region was performed at Jefferson Lab. Incident electrons of energies ranging from 0.4 GeV/c to 4 GeV/c scattered off {sup 4}He, {sup 12}C, {sup 56}Fe and {sup 208}Pb nuclei at four scattering angles (15deg., 60deg., 90deg., 120deg.) and scattered energies ranging from 0.1 GeV/c to 4 GeV/c. The Rosenbluth method with proper Coulomb corrections is used to extract the transverse and longitudinal response functions at three-momentum transfers 0.55 GeV/c {le} |q{yields}| {le} 1.0 GeV/c. The Coulomb Sum is determined in the same |q{yields}| range as mentioned above and will be compared to predictions. Analysis progress and preliminary results will be presented.

Huan Yao, Jefferson Lab Hall A Collaboration, E05-110 Collaboration

2012-04-01

342

Large eddy simulation of flow and heat transfer of an impinging radial jet  

NASA Astrophysics Data System (ADS)

LES with a dynamic SGS model of impinging axial and radial jets are compared to determine why radial jets with an exit angle ? 60° give larger heat transfer than the axial jet. The reason lies in the highly agitating nature of the "dead water" zone below the feed tube of the radial jet. LES captures this phenomenon correctly.

Cziesla, T.; Chattopadhyay, H.; Mitra, N. K.

343

Heat-transfer considerations for large liquefied-natural-gas storage tanks  

Microsoft Academic Search

Natural gas is used worldwide as a practical energy source. In order to have a concentrated form of energy, natural gas is liquefied and stored under a pressure slightly above atmospheric and at a corresponding temperature just above its normal boiling point (112 K). This investigation presents a general steady-state study of the heat transfers into such a storage tank.

P. Jourda; S. D. Probert

1991-01-01

344

Angular momentum in the Local Group  

SciTech Connect

We briefly review models for the Local Group and the acquisition of its angular momentum. We describe early attempts to understand the origin of the spin of the galaxies discussing the hypothesis that the Local Group has little angular momentum. Finally we show that using Peebles` least action principle there should be a rather large amount of orbital angular momentum compared to the magnitude of the spin of its galaxies. Therefore the Local Group cannot be thought as tidally isolated. Using Peebles` trajectories we give a possible set of trajectories for Local Group galaxies which would predict their spin.

Dunn, A. [Cambridge Univ. (United Kingdom). Inst. of Astronomy; Laflamme, R. [Los Alamos National Lab., NM (United States)

1994-04-01

345

Introducing electromagnetic field momentum  

NASA Astrophysics Data System (ADS)

I describe an elementary way of introducing electromagnetic field momentum. By considering a system of a long solenoid and line charge, the dependence of the field momentum on the electric and magnetic fields can be deduced. I obtain the electromagnetic angular momentum for a point charge and magnetic monopole pair partially through dimensional analysis and without using vector calculus identities or the need to evaluate integrals. I use this result to show that linear and angular momenta are conserved for a charge in the presence of a magnetic dipole when the dipole strength is changed.

Yu-Kuang Hu, Ben

2012-07-01

346

Donor flow formulation for momentum flux differencing  

SciTech Connect

A new donor flow formulation for momentum flux differencing has been developed to eliminate the pressure and velocity anomalies caused by fictitious momentum sources that arise when other numerical formulations are used to characterize the large density gradients associated with sodium boiling. This new formulation has been incorporated into the CAPRICORN subchannel code for sodium boiling in fuel bundles, resulting in considerable improvement in numerical performance.

Padilla, A. Jr.; Rowe, D.S.

1984-03-14

347

Heavy-ion transfer reactions studied at large internuclear distances with the PRISMA magnetic spectrometer  

NASA Astrophysics Data System (ADS)

We performed a study of the behaviour of the main transfer channels in the 116Sn+60Ni system at different bombarding energies from above to well below the Coulomb barrier. The experiment has been done in inverse kinematics, detecting the lighter target-like ions with the magnetic spectrometer PRISMA at very forward angles. Good mass, nuclear charge and kinetic energy resolutions have been achieved. Sufficient statistics has been accumulated to extract angular distributions for different bombarding energies, requiring a study of the response function of the spectrometer. The comparison between the data and microscopic calculations for the present case and for the previously measured 96Zr+40Ca system, namely superfluid and near closed shells nuclei, should significantly improve our understanding of nucleon-nucleon correlation properties in multinucleon transfer processes.

Montanari, D.; Corradi, L.; Szilner, S.; Pollarolo, G.; Fioretto, E.; Stefanini, A. M.; Farnea, E.; Michelagnoli, C.; Montagnoli, G.; Scarlassara, F.; Ur, C. A.; Courtin, S.; Goasduff, A.; Haas, F.; Mijatovi?, T.; Soi?, N.; Grebosz, J.

2013-03-01

348

Analyses of the Large Subunit Histidine-Rich Motif Expose an Alternative Proton Transfer Pathway in [NiFe] Hydrogenases  

PubMed Central

A highly conserved histidine-rich region with unknown function was recognized in the large subunit of [NiFe] hydrogenases. The HxHxxHxxHxH sequence occurs in most membrane-bound hydrogenases, but only two of these histidines are present in the cytoplasmic ones. Site-directed mutagenesis of the His-rich region of the T. roseopersicina membrane-attached Hyn hydrogenase disclosed that the enzyme activity was significantly affected only by the replacement of the His104 residue. Computational analysis of the hydrogen bond network in the large subunits indicated that the second histidine of this motif might be a component of a proton transfer pathway including Arg487, Asp103, His104 and Glu436. Substitutions of the conserved amino acids of the presumed transfer route impaired the activity of the Hyn hydrogenase. Western hybridization was applied to demonstrate that the cellular level of the mutant hydrogenases was similar to that of the wild type. Mostly based on theoretical modeling, few proton transfer pathways have already been suggested for [NiFe] hydrogenases. Our results propose an alternative route for proton transfer between the [NiFe] active center and the surface of the protein. A novel feature of this model is that this proton pathway is located on the opposite side of the large subunit relative to the position of the small subunit. This is the first study presenting a systematic analysis of an in silico predicted proton translocation pathway in [NiFe] hydrogenases by site-directed mutagenesis.

Szori-Doroghazi, Emma; Maroti, Gergely; Szori, Milan; Nyilasi, Andrea; Rakhely, Gabor; Kovacs, Kornel L.

2012-01-01

349

Electron Density Modeling of Large Systems Using the Transferable Atom Equivalent Method  

Microsoft Academic Search

The transferable atom equivalent (TAB) modeling method is a resource-efficient alternative to routine HF\\/SCF ab initio calculations. Electron density representations created by TAE reconstruction are designed to allow numerous molecular properties to be quickly assessed with results similar to those obtained at the HF\\/6-31 + G? level of theory. While Hartree-Fock calculations using this basis set do not provide state-of-the-art

Curt M. Breneman; Tracy R. Thompson; Marlon Rhem; Mei Dung

1995-01-01

350

Multi-dimensional NMR without coherence transfer: Minimizing losses in large systems  

PubMed Central

Most multi-dimensional solution NMR experiments connect one dimension to another using coherence transfer steps that involve evolution under scalar couplings. While experiments of this type have been a boon to biomolecular NMR the need to work on ever larger systems pushes the limits of these procedures. Spin relaxation during transfer periods for even the most efficient 15N–1H HSQC experiments can result in more than an order of magnitude loss in sensitivity for molecules in the 100 kDa range. A relatively unexploited approach to preventing signal loss is to avoid coherence transfer steps entirely. Here we describe a scheme for multi-dimensional NMR spectroscopy that relies on direct frequency encoding of a second dimension by multi-frequency decoupling during acquisition, a technique that we call MD-DIRECT. A substantial improvement in sensitivity of 15N–1H correlation spectra is illustrated with application to the 21 kDa ADP ribosylation factor (ARF) labeled with 15N in all alanine residues. Operation at 4 °C mimics observation of a 50 kDa protein at 35 °C.

Liu, Yizhou; Prestegard, James H.

2011-01-01

351

Momentum Space Package  

NSDL National Science Digital Library

The Momentum Space package is a self-contained file for the teaching of the time evolution and visualization of energy eigenstates and their superpositions via momentum space in quantum mechanics. The file contains ready-to-run OSP programs and a set of curricular materials. The material focuses on the wave function in both position and momentum space. The Momentum Space package is an Open Source Physics curricular package written for the teaching of quantum mechanics. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the osp_p_space.jar file will run the package if Java is installed. Other quantum mechanics packages are also available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Quantum Mechanics.

Belloni, Mario; Christian, Wolfgang

2008-05-30

352

Learning Transferable Skills in Large Lecture Halls: Implementing a POGIL Approach in Biochemistry  

ERIC Educational Resources Information Center

|As research-based, active learning approaches become more common in biochemistry classrooms, the large lecture course remains the most challenging to transform. Here, we provide a case study demonstrating how process oriented guided inquiry learning (POGIL) can be implemented in a large class taught in a traditional lecture hall. Course structure…

Bailey, Cheryl P.; Minderhout, Vicky; Loertscher, Jennifer

2012-01-01

353

Momentum distribution and final state effects in liquid neon  

Microsoft Academic Search

We report high precision inelastic neutron scattering measurements in liquid Neon at a temperature of 25.8 K and saturated\\u000a vapour pressure. The data covers a wide range of energy and momentum transfer (2 ?1?Q?13?1 The atomic momentum distribution,n(p), and final state effects (FSE) can be readily extracted from this intermediate wavevector transfer data provided a suitable\\u000a method of analysis is

R. T. Azuah; W. G. Stirling; H. R. Glyde; M. Boninsegni

1997-01-01

354

A subgrid-scale model for large-eddy simulation based on the physics of interscale energy transfer in turbulence  

NASA Astrophysics Data System (ADS)

The scale-similarity model in large-eddy simulation (LES) leads to an attractive, functionally simple expression for the subgrid-scale (SGS) stress tensor. It is well known, however, that the similarity model fails to accurately predict some of the most fundamental quantities in turbulent flows, perhaps the most important being the global energy transfer and the associated subgrid-scale dissipation. To address this, additional dissipative terms are usually added to the similarity model to improve its performance. In the present paper, considerations of interscale energy transfer have been used to identify sources of the observed deficiencies of the similarity model, specifically its inadequate balancing of terms contributing energy to the smallest scales and its duplication of terms producing effects in the largest scales. These considerations provide guidance in the development of a new model, which shows more favorable characteristics of energy transfer while preserving the functional simplicity of the scale-similarity model. Partial nonlinear terms are used to decompose the nonlinear transfer present in LES and to formulate a model expression capable of balancing small-scale production terms depositing energy near the LES cutoff. The proposed model is formulated in the same vein as the scale-similarity model, consisting of test filtered velocities and their products, but offers clear improvements in predictions of mean flow quantities and the global energy flux from the resolved to subgrid scales without the need for additional terms to augment subgrid-scale energy dissipation. The application of the new interscale transfer model in LES of wall-bounded flows leads to predictions of mean and RMS flow quantities comparable to those obtained for other, established SGS models.

Anderson, Brian W.; Domaradzki, J. Andrzej

2012-06-01

355

Horizontal transfer of a large and highly toxic secondary metabolic gene cluster between fungi.  

PubMed

Genes involved in intermediary and secondary metabolism in fungi are frequently physically linked or clustered. For example, in Aspergillus nidulans the entire pathway for the production of sterigmatocystin (ST), a highly toxic secondary metabolite and a precursor to the aflatoxins (AF), is located in a ?54 kb, 23 gene cluster. We discovered that a complete ST gene cluster in Podospora anserina was horizontally transferred from Aspergillus. Phylogenetic analysis shows that most Podospora cluster genes are adjacent to or nested within Aspergillus cluster genes, although the two genera belong to different taxonomic classes. Furthermore, the Podospora cluster is highly conserved in content, sequence, and microsynteny with the Aspergillus ST/AF clusters and its intergenic regions contain 14 putative binding sites for AflR, the transcription factor required for activation of the ST/AF biosynthetic genes. Examination of ?52,000 Podospora expressed sequence tags identified transcripts for 14 genes in the cluster, with several expressed at multiple life cycle stages. The presence of putative AflR-binding sites and the expression evidence for several cluster genes, coupled with the recent independent discovery of ST production in Podospora [1], suggest that this HGT event probably resulted in a functional cluster. Given the abundance of metabolic gene clusters in fungi, our finding that one of the largest known metabolic gene clusters moved intact between species suggests that such transfers might have significantly contributed to fungal metabolic diversity. PAPERFLICK: PMID:21194949

Slot, Jason C; Rokas, Antonis

2010-12-30

356

Experimental research on heat transfer of natural convection in vertical rectangular channels with large aspect ratio  

SciTech Connect

This work presents the experimental research on the steady laminar natural convection heat transfer of air in three vertical thin rectangular channels with different gap clearance. The much higher ratio of width to gap clearance (60-24) and the ratio of length to gap clearance (800-320) make the rectangular channels similar with the coolant flow passage in plate type fuel reactors. The vertical rectangular channels were composed of two stainless steal plates and were heated by electrical heating rods. The wall temperatures were detected with the K-type thermocouples which were inserted into the blind holes drilled in the steal plates. Also the air temperatures at the inlet and outlet of the channel were detected. The wall heat fluxes added to the air flow were calculated by the Fourier heat conduction law. The heat transfer characteristics were analyzed, and the average Nusselt numbers in all the three channels could be well correlated with the Rayleigh number or the modified Rayleigh number in a uniform correlation. Furthermore, the maximum wall temperatures were investigated, which is a key parameter for the fuel's integrity during some accidents. It was found that even the wall heat flux was up to 1500 W/m{sup 2}, the maximum wall temperature was lower than 350 C. All this work is valuable for the plate type reactor's design and safety analysis. (author)

Lu, Qing; Qiu, Suizheng; Su, Guanghui [State Key Laboratory of Multi Phase Flow in Power Engineering, Xi'an JIaotong University, Xi'an, Shaanxi 710049 (China); School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China); Tian, Wenxi; Ye, Zhonghao [School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)

2010-01-15

357

Quench dynamics of the Tomonaga-Luttinger model with momentum-dependent interaction  

NASA Astrophysics Data System (ADS)

We study the relaxation dynamics of the one-dimensional Tomonaga-Luttinger model after an interaction quench, paying particular attention to the momentum dependence of the two-particle interaction. Several potentials of different analytical forms are investigated that all lead to universal Luttinger liquid (LL) physics in equilibrium. The steady-state fermionic momentum distribution shows universal behavior in the sense of the LL phenomenology. For generic regular potentials, the large time decay of the momentum distribution function toward the steady-state value is characterized by a power law with a universal exponent that depends only on the potential at zero momentum transfer. The commonly employed ad hoc procedure fails to give this exponent. In addition to quenches from zero to positive interactions, we also consider the abrupt changes in the interaction between two arbitrary values. Additionally, we discuss the appearance of a factor of two between the steady-state momentum distribution function and that obtained in equilibrium at equal two-particle interaction.

Rentrop, J.; Schuricht, D.; Meden, V.

2012-07-01

358

Angular Momentum Acquisition in Galaxy Halos  

NASA Astrophysics Data System (ADS)

We use high-resolution cosmological hydrodynamic simulations to study the angular momentum acquisition of gaseous halos around Milky-Way-sized galaxies. We find that cold mode accreted gas enters a galaxy halo with ~70% more specific angular momentum than dark matter averaged over cosmic time (though with a very large dispersion). In fact, we find that all matter has a higher spin parameter when measured at accretion than when averaged over the entire halo lifetime, and is well characterized by ? ~ 0.1, at accretion. Combined with the fact that cold flow gas spends a relatively short time (1-2 dynamical times) in the halo before sinking to the center, this naturally explains why cold flow halo gas has a specific angular momentum much higher than that of the halo and often forms "cold flow disks." We demonstrate that the higher angular momentum of cold flow gas is related to the fact that it tends to be accreted along filaments.

Stewart, Kyle R.; Brooks, Alyson M.; Bullock, James S.; Maller, Ariyeh H.; Diemand, Jürg; Wadsley, James; Moustakas, Leonidas A.

2013-05-01

359

Reconstruction of large cranial defects in the presence of heavy radiation damage and infection utilizing tissue transferred by microvascular anastomoses  

SciTech Connect

Six cases of large defects of the scalp, skull, and dura following tumor ablation and radiation are presented. Each was accompanied by chronic infection in the irradiated defect. Efforts to reconstruct the resulting defects with local flaps were not successful. One-stage reconstruction was then accomplished in each case utilizing a latissimus dorsi musculocutaneous or myo-osteocutaneous free flap transferred by microvascular anastomoses. The versatility of the latissimus dorsi musculocutaneous and/or osseous flap allows single-stage reconstruction of these complex defects.

Robson, M.C.; Zachary, L.S.; Schmidt, D.R.; Faibisoff, B.; Hekmatpanah, J.

1989-03-01

360

Whence the Minkowski momentum?  

NASA Astrophysics Data System (ADS)

Electromagnetic waves carry the Abraham momentum, whose density is given by pEM = S(r,t)/c2. Here S(r, t) = E(r, t)×H(r, t) is the Poynting vector at point r in space and instant t in time, E and H are the local electromagnetic fields, and c is the speed of light in vacuum. The above statement is true irrespective of whether the waves reside in vacuum or within a ponderable medium, which medium may or may not be homogeneous, isotropic, transparent, linear, magnetic, etc. When a light pulse enters an absorbing medium, the force experienced by the medium is only partly due to the absorbed Abraham momentum. This absorbed momentum, of course, is manifested as Lorentz force (while the pulse is being extinguished within the absorber), but not all the Lorentz force experienced by the medium is attributable to the absorbed Abraham momentum. We consider an absorptive/ reflective medium having the complex refractive index n2+i ?2, submerged in a transparent dielectric of refractive index n1, through which light must travel to reach the absorber/reflector. Depending on the impedance-mismatch between the two media, which mismatch is dependent on n1, n2, ?2, either more or less light will be coupled into the absorber/reflector. The dependence of this impedance-mismatch on n1 is entirely responsible for the appearance of the Minkowski momentum in certain radiation pressure experiments that involve submerged objects.

Mansuripur, Masud; Zakharian, Armis R.

2009-08-01

361

Whence the Minkowski momentum?  

NASA Astrophysics Data System (ADS)

Electromagnetic waves carry the Abraham momentum, whose density is given by pEM = S(r,t) / c2. Here S(r,t) = E(r,t) × H(r,t) is the Poynting vector at point r in space and instant t in time, E and H are the local electromagnetic fields, and c is the speed of light in vacuum. The above statement is true irrespective of whether the waves reside in vacuum or within a ponderable medium, which medium may or may not be homogeneous, isotropic, transparent, linear, magnetic, etc. When a light pulse enters an absorbing medium, the force experienced by the medium is only partly due to the absorbed Abraham momentum. This absorbed momentum, of course, is manifested as Lorentz force (while the pulse is being extinguished within the absorber), but not all the Lorentz force experienced by the medium is attributable to the absorbed Abraham momentum. We consider an absorptive/reflective medium having the complex refractive index n2 + i?2, submerged in a transparent dielectric of refractive index n1, through which light must travel to reach the absorber/reflector. Depending on the impedance-mismatch between the two media, which mismatch is dependent on n1, n2, ?2, either more or less light will be coupled into the absorber/reflector. The dependence of this impedance-mismatch on n1 is entirely responsible for the appearance of the Minkowski momentum in certain radiation pressure experiments that involve submerged objects.

Mansuripur, Masud; Zakharian, Armis R.

2010-10-01

362

Estimating convective momentum fluxes using geostationary satellite data  

Microsoft Academic Search

Research and case studies have shown that convection plays a large role toward the feedbacks of momentum to the large-scale environment. Convective momentum fluxes have been studied for many years using in situ and aircraft measurements, along with numerical simulations. However, little work has been conducted on developing a method to use satellite remote sensing as a tool to diagnose

Christopher P. Jewett; John R. Mecikalski

2010-01-01

363

Technology Transfer and the Flow of Technical Information in a Large Industrial Corporation.  

National Technical Information Service (NTIS)

A 'user study' was made of the acquisition of useful technical information by scientists and engineers in five divisions of a large industrial corporation. More than 1,200 instances of the acquisition of such information were described on self-administere...

C. P. McLaughlin R. S. Rosenbloom F. W. Wolek

1965-01-01

364

Cognitive Transfer Revisited: Can We Exploit New Media to Solve Old Problems on a Large Scale?  

ERIC Educational Resources Information Center

|The work we report in this special issue attempted to exploit the power of technology and cognitive theory to help make conceptual systems taught in large college courses truly useful in students' future lives. Facing evidence that traditional instructional models have not succeeded in this regard, we sought feasible course designs and…

Derry, Sharon J.; Hmelo-Silver, Cindy E.; Nagarajan, Anandi; Chernobilsky, Ellina; Beitzel, Brian D.

2006-01-01

365

Free tissue transfer provides durable treatment for large nonhealing venous ulcers  

Microsoft Academic Search

Background: Most venous ulcers (VUs) will heal with conventional treatment, which focuses on improving regional venous hemodynamics. This treatment, however, often fails to heal large, recurrent VUs that are associated with severe lipodermatosclerosis (LDS). These complicated ulcers may require correction of local venous hemodynamics and replacement of the surrounding LDS with healthy tissue. We report our experience managing 24 especially

Norman H. Kumins; Norman Weinzweig; James J. Schuler

2000-01-01

366

Adoptive transfer of allogeneic tumor-specific T cells mediates effective regression of large tumors across major histocompatibility barriers  

PubMed Central

Graft-versus-tumor effects can be achieved after allogeneic bone marrow transplantation in patients with malignancies of the kidney or hematopoietic system but are often accompanied by severe graft-versus-host-disease (GVHD). We sought to maximize graft-versus-tumor while minimizing GVHD using tumor-specific allogeneic effector T cells rather than open-repertoire T cells. We transferred allogeneic CD8+ pmel-1 or CD4+ TRP-1 T cells specific for the melanoma-associated antigens, glycoprotein 100 (gp100) and tyrosinase-related protein-1 (TRP-1), respectively, into B16-melanoma–bearing mice. Mice receiving a preparative regimen of nonmyeloablating (5 Gy) total body irradiation experienced the rapid rejection of tumor-specific allogeneic lymphocytes with no impact on tumor growth. However, when mice were given more intense total body irradiation conditioning regimens combined with autologous bone marrow transplantation, adoptively transferred allogeneic tumor-specific T lymphocytes persisted at detectable levels for several weeks and mediated significant regression of large, vascularized tumors. We found that the risk of GVHD was low when tumor-specific T cells were transferred and significant toxicity was observed only when substantial numbers of open repertoire allogeneic naive T cells were mixed with the tumor-specific lymphocytes. Taken together, these data indicate that the use of tumor-specific allogeneic CD8+ T cells or CD4+ can result in significant antitumor effects in the absence of measurable GVHD.

Boni, Andrea; Muranski, Pawel; Cassard, Lydie; Wrzesinski, Claudia; Paulos, Chrystal M.; Palmer, Douglas C.; Gattinoni, Luca; Hinrichs, Christian S.; Chan, Chi-Chao; Rosenberg, Steven A.

2008-01-01

367

Efficient GPU calculation of 2D-echo spectra of excitonic energy-transfer in systems with large reorganization energy  

NASA Astrophysics Data System (ADS)

Using the Fenna-Matthews-Olson light harvesting complex as example, we calculate the two dimensional echo spectra (2D echo) of a multi-site system coupled to phonon baths using the propagation scheme suggested by Ishizaki and Fleming in 2009 which works for large system-bath couplings. We study the anti-correlations in the shapes of the 2D spectrum peaks which are seen as evidence for exciton energy transfer. This computationally demanding calculation uses 2.6 h GPU (graphics processing unit) time compared to 2.8 weeks time on a high performance conventional CPU cluster. The efficient implementation of the exact hierarchical equations obliterates the need for approximative methods and facilitates the interpretation and comparison of theory and experiment for systems with large reorganization energies. References see www.quantumdynamics.de

Hein, Birgit; Kreisbeck, Christoph; Kramer, Tobias; Rodriguez, Mirta

2011-03-01

368

Fragment separator momentum compression schemes  

NASA Astrophysics Data System (ADS)

We present a scheme to use a fragment separator and profiled energy degraders to transfer longitudinal phase space into transverse phase space while maintaining achromatic beam transport. The first order beam optics theory of the method is presented and the consequent enlargement of the transverse phase space is discussed. An interesting consequence of the technique is that the first order mass resolving power of the system is determined by the first dispersive section up to the energy degrader, independent of whether or not momentum compression is used. The fragment separator at the Facility for Rare Isotope Beams is a specific application of this technique and is described along with simulations by the code COSY INFINITY.

Bandura, Laura; Erdelyi, Bela; Hausmann, Marc; Kubo, Toshiyuki; Nolen, Jerry; Portillo, Mauricio; Sherrill, Bradley M.

2011-07-01

369

Pilot study on cryogenic heat transfer in biological tissues embedded with large blood vessels  

Microsoft Academic Search

Blood flow through large vessel plays an important role in affecting the temperature profiles of the living tissues under\\u000a cryosurgery. Besides, arresting of blood vessels due to freezing may possibly cause danger to the patient, which needs to\\u000a be considered when operating the cryoprobe. However, such important issues received few attentions in the bioheat field even\\u000a up to date. In

Y. T. Zhang; J. Liu; Y. X. Zhou

2002-01-01

370

Energy conservation by subsurface construction: heat transfer studies in a large underground building. First annual report  

Microsoft Academic Search

This research program addresses the question of the energy-saving possibilities of subsurface structures. The thermal design data needed to calculate the heating and cooling loads of such buildings will be generated by fully instrumenting the University of Minnesota's new Bookstore\\/Admissions and Records Building, a large building of 7700 square meters (83,000 square feet) floor area, 95% of which is underground,

E. Eckert; T. P. Bligh; E. Pfender

1976-01-01

371

Temporal modulation transfer function of fluoroscopic systems: small-signal versus large-signal approaches  

NASA Astrophysics Data System (ADS)

Metrics of system performance are used to assess the abilities and safety of x-ray imaging systems. The detective quantum efficiency (DQE) is used as a measure of "dose efficiency" but, when applied to fluoroscopic systems, requires a measurement of the temporal modulation transfer function (MTF) to account for the effects of system lag. It is shown that the temporal MTF is exposure-rate dependent, and hence must be measured under the specific exposure conditions of interest. We develop a small-signal approach to temporal MTF measurements using a semi-transparent moving slanted edge. Using an x-ray image intensifier-based bench-top system, we show that there is a 50% overstatement of the DQE when not properly accounting for lag. The small-signal approach is used to calculate a lag-free fluoroscopic DQE that agrees with a radiographic DQE measurement under the same exposure-rate conditions. It was found that the temporal MTF did not change within measured precision over normal fluoroscopic conditions, and the radiopaque falling-edge results were consistent with the small-signal temporal MTF. This approach could be implemented in a clinical setting with access to raw (linear or linearized) fluoroscopic image data and could be generalized for use on pulsed-exposure systems.

Friedman, S. N.; Cunningham, I. A.

2008-04-01

372

Modulation transfer function for a large-area amorphous silicon image receptor  

NASA Astrophysics Data System (ADS)

The modulation transfer function (MTF) of an amorphous silicon (aSi) sensor array was measured using proper sampling techniques to determine the edge spread function (ESF). The detector under study was a area detector (EG&G Heimann, RTM128) consisting of aSi photodiodes arranged in a square array. Two independent methods for calculating the presampling MTF were implemented, based on finely sampling the ESF measurements produced using 40 kV x-rays from a Faxitron microfocal spot x-ray tube. The two calculations of the detector's presampling MTF are in excellent agreement, and are within 20% at the Nyquist frequency when compared with the ideal MTF based only on the size of the detector elements. ESF measurements were also made at 6 MV on a Siemens MD-2 linear accelerator. A calculation of the system presampling MTF was performed which included effects from the linear accelerator source, the lead block used to create the high contrast edge, and the aSi detector response.

Earnhart, Jonathan R. D.; Chaney, Edward L.

1997-12-01

373

High sensitivity double relaxation oscillation superconducting quantum interference devices with large transfer from flux to voltage  

SciTech Connect

Double relaxation oscillation superconducting quantum interference devices (SQUIDs) (DROSs) based on Nb/AlO{sub {ital x}} tunnel junctions have been fabricated and characterized. The estimated relaxation frequencies range from 400 MHz up to 14 GHz. Transfer coefficients from flux to voltage of 2 up to 7 mV/{phi}{sub 0} have been obtained. Both the intrinsic flux noise and the performance in a flux-locked loop with direct-voltage readout have been determined. Special attention is paid to the effect of damping resistors on the sensitivity of DROSs. The intrinsic sensitivity improves with increasing relaxation frequency, leveling off to a value of 13{ital h} at relaxation frequencies above 2--3 GHz for SQUID inductances of about 30 pH. This sensitivity is very close to the theoretical maximum sensitivity of 6{ital h} of a comparable standard type dc SQUID. In a flux-locked loop based on direct-voltage readout, a noise level of 0.55 {mu}{phi}{sub 0}/{radical}Hz corresponding to an energy sensitivity of 34{ital h} has been obtained for a DROS with a SQUID inductance of 29 pH. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

Adelerhof, D.J.; Kawai, J.; Uehara, G.; Kado, H. [Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba 303 (Japan)

1995-03-01

374

Ideal linear-chain polymers with fixed angular momentum.  

PubMed

The statistical mechanics of a linear noninteracting polymer chain with a large number of monomers is considered with fixed angular momentum. The radius of gyration for a linear polymer is derived exactly by functional integration. This result is then compared to simulations done with a large number of noninteracting rigid links at fixed angular momentum. The simulation agrees with the theory up to finite-size corrections. The simulations are also used to investigate the anisotropic nature of a spinning polymer. We find universal scaling of the polymer size along the direction of the angular momentum, as a function of rescaled angular momentum. PMID:21867202

Brunner, Matthew; Deutsch, J M

2011-07-15

375

Vortices in (e,2e) momentum distributions  

NASA Astrophysics Data System (ADS)

Complete experiments measure all variables associated with atomic processes. Momentum distributions of ejected electrons in pure states, as for (e,2e) measurements, are examples of such complete experiments. All structures seen in such distributions are listed by Briggs and co-workersootnotetextJ. Berakdar and J. S. Briggs, J. Phys. B, 27, 4271 (1994). in 1994. Recently, we pointed out that there is a type of structure not included in the list. It has been shown that momentum distributions image time-dependent wave functions, and such wave functions may contain vortices owing to angular momentum transfer between species involved in the dynamical processes. The vortices are associated with exact zeros at single, isolated points. We have found such zeros in calculated momentum distributions for ion-atom collisions, photoionization, and (e,2e) distributions. By mapping distributions that image time-dependent wave functions we find velocity fields that circulate about exact zeros confirming their vortex structure. The vortices appear as unexpected holes in the (e,2e) momentum distributions. Our calculations suggest that one particular vortex has been observed.ootnotetextA. J. Murray and F. H. Read, Phys. Rev. A, 47, 3724 (1993).

Macek, J. H.; Ovchinnikov, S. Y.; Sternberg, J. B.

2010-03-01

376

Vertical stress transfer after large subduction zone earthquakes: 2007 Tocopilla /North Chile case study  

NASA Astrophysics Data System (ADS)

Large interplate subduction zone earthquakes occur on fault planes within the seismogenic interface which, in the case of Northern Chile, usually start to break at the down dip end of the coupled interface, propagating towards the trench. Although the rupture is a horizontally oriented process, some vertical connectivity between the interface and the upper crust should be expected. We study two clusters of aftershock seismicity from the Mw 7.7, 2007, Tocopilla earthquake in Northern Chile Both clusters seem to align along vertical profiles in the upper crust above the main shock rupture plane. The first cluster has a rather dissipative character at the up-dip limit of the rupture plane in the off-shore area around the Peninsula of Mejillones. It developed in the early stage of the aftershock sequence. The second cluster lies above the pronounced aftershock sequence of a secondary large Mw 6.9 slab-push event on 16th of December 2007. This type of compressional event can occur after large thrust earthquakes. A comparison of the epicentral distribution of the crustal events belonging to the aftershock sequence suggests a possible relation to the Cerro Fortuna Fault in the Coastal Cordillera which is a subsidiary fault strand of the major Atacama Fault Zone. We compute the Coulomb stress change on the respective faults of both clusters analyzed to see where slip is promoted or inhibited due to the slip on the subduction interface. We then combine these results with the spatial and temporal aftershock distribution, focal mechanism solutions, b-value mappings and geological evidences to understand the process behind the ascending seismicity clusters and their relation to the main shock of the major Tocopilla event.

Eggert, S.; Sobiesiak, M.; Victor, P.

2011-12-01

377

Developmental expression and nutritional regulation of a zebrafish gene homologous to mammalian microsomal triglyceride transfer protein large subunit.  

PubMed

The microsomal triglyceride transfer protein (MTP) large subunit is required for the assembly and secretion of apolipoprotein B-containing lipoproteins. We have found a zebrafish mtp homologous gene coding a protein with 54% identity with human MTP large subunit with the most conserved regions distributed in the corresponding predicted alpha-helical and C- and A-sheet domains. In situ hybridizations showed that zebrafish mtp transcripts were distributed in the yolk syncytial layer during early embryogenesis and in anterior intestine and liver from 48 hr postfertilization onward. Real-time quantitative RT-PCR confirmed the developmental regulation and tissue-specificity of mtp expression. A significant pretranslational up-regulation of mtp expression was observed in the anterior intestine after feeding. The nutritional regulation of zebrafish mtp expression observed in the anterior intestine supports the notion that this protein, similar to mammalian MTP large subunit, could be a factor implicated directly or indirectly in large lipid droplets accumulation observed in the fish enterocyte after feeding. PMID:15614773

Marza, Esther; Barthe, Christophe; André, Michèle; Villeneuve, Laure; Hélou, Chantal; Babin, Patrick J

2005-02-01

378

Learning about Momentum Conservation  

Microsoft Academic Search

A system has been designed in which explanation-based learning is applied to classical mechanics. An overview of the fully-implemented system and an example run by it are presented. From the example the system acquires a general formula describing how the momentum of a collection of objects changes over time. The derivation of this formula is prompted by the analysis of

Jude W. Shavlik

1985-01-01

379

Angular momentum conservation demonstration  

NSDL National Science Digital Library

A short article describing the fabrication and operation of a simple angular momentum conservation demonstration. The demonstration is based on a Lazy Susan, and cylindrical brass weights tied with a nylon string. The string can be pulled or released changing the radius or rotation of the weights.

Berg, Richard E.; Anders, Robert E.

2010-12-23

380

Momentum distributions: An overview  

NASA Astrophysics Data System (ADS)

There have been several excellent reviews of momentum-distribution research in particular subject areas of physics such as electronic systems and nuclear systems. However, it is the commonality of interests, difficulties, and prospects across all of physics, along with certain pivotal advances, which led to the organization of an interdisciplinary Workshop on Momentum Distributions held at Argonne National Laboratory on 24 and 26 October 1988. The purpose of this overview is to explain why scientists with such diverse backgrounds were brought together at this meeting, to introduce and discuss the common elements of momentum-distribution studies, and to establish a common language. We hope to facilitate an appreciation of the more specialized articles which follow in these proceedings. We begin by summarizing the general properties of momentum distributions. Differences and similarities of atomic, electronic, and nuclear many-body systems are examined, in terms of characteristic lengths and energies, relative importance of exchange, and the nature of the two-particle interactions. We continue with a brief commentary on the microscopic methods used to calculate n(p) from first principles.

Sokol, P. E.; Silver, R. N.; Clark, J. W.

381

"Some Like it Hot” - Evidence for the Shrinking Orbit of the 2.2-day Transiting Hot Jupiter Exoplanet HD 189733b - Evidence of Transfer of Planet Orbital Momentum to its Host Star  

NASA Astrophysics Data System (ADS)

HD189733A is a K2V star that has attracted much attention because it hosts a transiting, hot Jupiter-exoplanet. HD189733b has one of the shortest known orbital-periods (P = 2.22-days) and is only 0.031AU from its host star (Buchy et al. 2005). Based on measurements of the K2V star's P(rot) from starspot-modulations of 12-d, coronal Lx 1028 ergs/s, and chromospheric Ca II-HK emission, indicate an age 0.6 -1.0 Gyr - inferred from our rotation-age-activity relations. However, this age is discrepant with an older-age inferred from the star's low Lithium-abundance ( 1/10 Solar.). However, the age-rotation-activity determination assumes no tidal-effects from close companions- such as close planet. Recently Gaspar et al. (2006) discovered a dM4 companion star (HD 189733 B: 12'' distance to the K-dwarf). X MM-Newton observations of the HD 189733 A&B carried out recently by Pilliteri et al. (2010), surprisingly revealed that HD 189733B shows no X-ray emission, with an upper limit of 9*1026 ergs/s. Using activity-age relationships for dM-stars, we expected a Lx of an order of magnitude higher for age <1.0 Ga. This apparent discrepancy can be resolved by the supposition that the K2V-star has been spun-up by its nearby planetary companion, and that its age determined from activity-rotation relationships is invalid. This supposition is supported by the recent photometry by the Kepler for 300+ exoplanet candidate systems discovered thus far (Borucki et al. 2010). The analysis these data have reveal that tidal locking between the planet and host star has occurred for a significant number of exoplanet with short orbital periods. We explain the fast rotation of the K2 star via the transfer of the planet's orbital angular momentum to the star via tidal interactions. The significance of these finding with respect to the evolution of planetary systems is discussed. This work is partially supported by NSF/RUI grant AST-1009903.

Santapaga, Thomas; Guinan, E. F.; Ballouz, R.; Engle, S. G.; Dewarf, L.

2011-01-01

382

Transferring automation for large-scale development and production of Invader SNP assays  

NASA Astrophysics Data System (ADS)

The Human Genome Project has led to the discovery of hundreds of thousands of single nucleotide polymorphisms (SNPs). SNPs can act as genetic markers to create high- density maps of the human genome for large-scale genetic analysis for evaluating links between genetic mutations and human diseases and for performing association studies. To create those maps, assays capable of detecting many different SNPs must be developed rapidly, as additional SNPs are discovered. When both the design of and the technology used in the assays can be partially or fully automated, the development process and the time to results can be accomplished quickly and efficiently. InvaderTM technology offers a highly sensitive signal amplification system that detects and quantifies mutations and SNPs from unamplified human genomic DNA in two sequential steps.

Neri, Bruce P.; Ganske, R.; Isaczyszyn, W.; Beaty, Edward L.

2000-03-01

383

Estimating energy-momentum and angular momentum near null infinity  

SciTech Connect

The energy-momentum and angular momentum contained in a spacelike two-surface of spherical topology are estimated by joining the two-surface to null infinity via an approximate no-incoming-radiation condition. The result is a set of gauge-invariant formulas for energy-momentum and angular momentum which should be applicable to much numerical work; it also gives estimates of the finite-size effects.

Helfer, Adam D. [Department of Mathematics, University of Missouri, Columbia, Missouri 65211 (United States)

2010-04-15

384

Ground state isomerism in betacarboline hydrogen bond complexes: The charge transfer nature of its large Stokes shifted emission  

NASA Astrophysics Data System (ADS)

The hydrogen bonding and excited state proton transfer reactions between betacarboline, 9 H-pyrido[3,4- b]indole, BC, and 1,1,1,3,3,3-hexafluoropropan-2-ol, HFIP, have been studied in the aprotic solvents cyclohexane and toluene by absorption, steady state and time resolved fluorescence measurements. On the basis of these results and those of previous works (Refs. [A. Sánchez-Coronilla, C. Carmona, M.A. Muñoz, M. Balón, Chem. Phys., 327 (2006) 70] and [A. Sánchez-Coronilla, M. Balón, M.A. Muñoz, C. Carmona, Chem. Phys. 344 (2008) 72]) two main fundamental conclusions can be drawn on the photophysical behaviour of BC. Thus, it is shown, for the first time, that the non-cyclic double hydrogen bond complexes formed through both nitrogen atoms of BC, DHB, can suffer, in their ground state, an isomerisation process. These adducts acquire a quinoid structure in cyclohexane, but maintain a dipolar zwitterionic structure in toluene. Moreover, it is concluded that the observed large Stokes shifted emission, around 520 nm, is not due, as it has been so far generally accepted, to the emission of a BC zwitterionic phototautomer, but to the intramolecular charge transfer, ICT, excited state emissions of the DHB hydrogen bond adducts.

Sánchez-Coronilla, Antonio; Balón, Manuel; Muñoz, María A.; Hidalgo, José; Carmona, Carmen

2008-07-01

385

Large Area Synthesis of WS2 Crystalline Sheets Directly on SiO2 and Their Transfer to Other Substrates  

NASA Astrophysics Data System (ADS)

Metal dichalcogenides (e.g. MoS2, WS2, NbS2) have attracted attention because they are layered materials that could exhibit either semiconducting or metallic properties. These properties could be significantly modified when these materials become monolayers. Here we report for the first time the synthesis of large area few-layer WS2 by a two step method. WOx thin films were first grown on a Si/SiO2 substrate and these films were sulfurized in a second step. Furthermore, we have developed an efficient route to transfer these WS2 films onto different substrates. WS2 films of different thicknesses have been analyzed by Raman spectroscopy, HRTEM and AFM. Characterization techniques demonstrate the presence of mono-, bi- and few-layered WS2 in the as-grown samples. The novel photoluminescence properties of the films will also be discussed.

Elias, Ana Laura; Perea-Lopez, Nestor; Castro-Beltran, Andres; Berkdemir, Ayse; Feng, Simin; Lv, Ruitao; Long, Aaron; Hayashi, Takuya; Ahm Kim, Yoong; Endo, Morinobu; Gutierrez, Humberto R.; Ghosh, Sujoy; Talapatra, Saikat; Pradhan, Nihar R.; Balicas, Luis; Lopez-Urias, Florentino; Terrones, Humberto; Terrones, Mauricio

2013-03-01

386

Newtonian Mechanics: Momentum  

NSDL National Science Digital Library

This web page provides an elementary introduction and overview of momentum and a discussion of recoil, conservation and energy. A lesson plan and related pages are also linked to this page. This is part of an extensive web site, "From Stargazers to Starships", that uses the topics of space exploration and space science to introduce topics in physics and astronomy. Translations in French, Italian and Spanish are available.

Stern, David

2008-09-03

387

Plate tectonics conserves angular momentum  

NASA Astrophysics Data System (ADS)

A new combined understanding of plate tectonics, Earth internal structure, and the role of impulse in deformation of the Earth's crust is presented. Plate accelerations and decelerations have been revealed by iterative filtering of the quaternion history for the Euler poles that define absolute plate motion history for the past 68 million years, and provide an unprecedented precision for plate angular rotation variations with time at 2-million year intervals. Stage poles represent the angular rotation of a plate's motion between adjacent Euler poles, and from which the maximum velocity vector for a plate can be determined. The consistent maximum velocity variations, in turn, yield consistent estimates of plate accelerations and decelerations. The fact that the Pacific plate was shown to accelerate and decelerate, implied that conservation of plate tectonic angular momentum must be globally conserved, and that is confirmed by the results shown here (total angular momentum ~1.4 E+27 kgm2s-1). Accordingly, if a plate decelerates, other plates must increase their angular momentums to compensate. In addition, the azimuth of the maximum velocity vectors yields clues as to why the "bend" in the Emperor-Hawaiian seamount trend occurred near 46 Myr. This report summarizes processing results for 12 of the 14 major tectonic plates of the Earth (except for the Juan de Fuca and Philippine plates). Plate accelerations support the contention that plate tectonics is a product of torques that most likely are sustained by the sinking of positive density anomalies due to phase changes in subducted gabbroic lithosphere at depth in the upper lower mantle (above 1200 km depth). The tectonic plates are pulled along by the sinking of these positive mass anomalies, rather than moving at near constant velocity on the crests of convection cells driven by rising heat. These results imply that spreading centers are primarily passive reactive features, and fracture zones (and wedge-shaped sites of seafloor spreading) are adjustment zones that accommodate strains in the lithosphere. Further, the interlocked pattern of the Australian and Pacific plates the past 42 Million years (with their absolute plate motions near 90° to each other) is taken as strong evidence that large thermally driven "roller" convection cells previously inferred as the driving mechanism in earlier interpretations of continental drift and plate tectonics, have not been active in the Earth's mantle the past 42 Million years, if ever. This report also presents estimates of the changes in location and magnitude of the Earth's axis of total plate tectonic angular momentum for the past 62 million years.

Bowin, C.

2009-03-01

388

Effect of variable heat transfer coefficient on tissue temperature next to a large vessel during radiofrequency tumor ablation  

PubMed Central

Background One of the current shortcomings of radiofrequency (RF) tumor ablation is its limited performance in regions close to large blood vessels, resulting in high recurrence rates at these locations. Computer models have been used to determine tissue temperatures during tumor ablation procedures. To simulate large vessels, either constant wall temperature or constant convective heat transfer coefficient (h) have been assumed at the vessel surface to simulate convection. However, the actual distribution of the temperature on the vessel wall is non-uniform and time-varying, and this feature makes the convective coefficient variable. Methods This paper presents a realistic time-varying model in which h is a function of the temperature distribution at the vessel wall. The finite-element method (FEM) was employed in order to model RF hepatic ablation. Two geometrical configurations were investigated. The RF electrode was placed at distances of 1 and 5 mm from a large vessel (10 mm diameter). Results When the ablation procedure takes longer than 1–2 min, the attained coagulation zone obtained with both time-varying h and constant h does not differ significantly. However, for short duration ablation (5–10 s) and when the electrode is 1 mm away from the vessel, the use of constant h can lead to errors as high as 20% in the estimation of the coagulation zone. Conclusion For tumor ablation procedures typically lasting at least 5 min, this study shows that modeling the heat sink effect of large vessels by applying constant h as a boundary condition will yield precise results while reducing computational complexity. However, for other thermal therapies with shorter treatment using a time-varying h may be necessary.

dos Santos, Icaro; Haemmerich, Dieter; Pinheiro, Cleber da Silva; da Rocha, Adson Ferreira

2008-01-01

389

Collisions and Momentum: Bouncing Balls  

NSDL National Science Digital Library

As a continuation of the theme of potential and kinetic energy, this lesson introduces the concepts of momentum, elastic and inelastic collisions. Many sports and games, such as baseball and ping-pong, illustrate the ideas of momentum and collisions. Students explore these concepts by bouncing assorted balls on different surfaces and calculating the momentum for each ball.

Integrated Teaching And Learning Program

390

Parametric study and multiple correlations on air-side heat transfer and friction characteristics of fin-and-tube heat exchangers with large number of large-diameter tube rows  

Microsoft Academic Search

In the present study, for industrial applications of large inter-coolers employed in multi-stage compressor systems the air-side laminar heat transfer and fluid flow characteristics of plain fin-and-tube heat exchangers with large number of tube rows and large diameter of the tubes are investigated numerically through three-dimensional simulations based on the SIMPLE algorithm in Cartesian coordinates. The effects of parameters such

Gongnan Xie; Qiuwang Wang; Bengt Sunden

2009-01-01

391

Momentum integral network method for thermal-hydraulic transient analysis  

NASA Astrophysics Data System (ADS)

A new momentum integral network method has been developed, and tested in the MINET computer code. The method was developed in order to facilitate the transient analysis of complex fluid flow and heat transfer networks, such as those found in the balance of plant of power generating facilities. The method employed in the MINET code is a major extension of a momentum integral method reported by Meyer. Meyer integrated the momentum equation over several linked nodes, called a segment, and used a segment average pressure, evaluated from the pressures at both ends. Nodal mass and energy conservation determined nodal flows and enthalpies, accounting for fluid compression and thermal expansion.

Vantuyle, G. J.

1983-03-01

392

The momentum imbalance paradox  

NASA Astrophysics Data System (ADS)

The classical question of what happens when anomalous water enters an ocean via a meridional northward channel is addressed analytically using a reduced-gravity nonlinear model. The channel corresponds to either a conduit connecting 2 otherwise separated basins (e.g., the Yucatan Channel) or a conduit carrying water from an independent source. The traditional view is that, due to the Coriolis force, such an anomalous northward flowing current turns to the right (looking offshore) and forms a zonal boundary current that flows eastward. In this scenario, a front (corresponding to a surfacing interface) separates the oceanic and the anomalous water. Integration of the steady inviscid momentum equation along the boundary gives the long-shore flow-force and shows that such a scenario leads to a paradox. Specifically, such a flow corresponds to an unbalanced flow-force and, therefore, cannot exist. To balance the integrated momentum and resolve the paradox the inflow constantly sheds anticyclones which propagate to the left due to ?. Under such conditions, the momentum of the eddies moving to the left balances the momentum of the current flowing to the right. This new eddy shedding mechanism may explain why the Loop Current produces loops and why other inflows produce anticyclones. A nonlinear analytical solution to the problem is constructed with the aid of a new and powerful theoretical approach which is based on the idea that, after each eddy generation process, the system returns to its original state. This implies that nonlinear periodic flows can be integrated over a control volume in a similar manner to the integration used in steady flows. This novel method enables us to extract the details of the resulting features (i.e., their size, speed, periodicity and depth of the shedded rings) without solving for the details of the incredibly complicated three-dimensional and time-dependent generation process. It turns out that the problem involves a new eddy length scaleRd/?1/6 (where Rd is the parent current Rossby radius and ?=?Rd/f0) which is somewhat greater than that of most eddies. Calculations were made for both zero and finite potential vorticity flows; they show that, for currents such as the Loop Current which transports about 20 Sv, eddies are shed approximately once every 300days. Quantitative numerical experiments using the Bleck and Boudra model show that, indeed, an inflow along a straight coastline produces eddies next to the source.

Pichevin, Thierry; Nof, Doron

1997-03-01

393

Mobilisation and remobilisation of a large archetypal pathogenicity island of uropathogenic Escherichia coli in vitro support the role of conjugation for horizontal transfer of genomic islands  

PubMed Central

Background A substantial amount of data has been accumulated supporting the important role of genomic islands (GEIs) - including pathogenicity islands (PAIs) - in bacterial genome plasticity and the evolution of bacterial pathogens. Their instability and the high level sequence similarity of different (partial) islands suggest an exchange of PAIs between strains of the same or even different bacterial species by horizontal gene transfer (HGT). Transfer events of archetypal large genomic islands of enterobacteria which often lack genes required for mobilisation or transfer have been rarely investigated so far. Results To study mobilisation of such large genomic regions in prototypic uropathogenic E. coli (UPEC) strain 536, PAI II536 was supplemented with the mobRP4 region, an origin of replication (oriVR6K), an origin of transfer (oriTRP4) and a chloramphenicol resistance selection marker. In the presence of helper plasmid RP4, conjugative transfer of the 107-kb PAI II536 construct occured from strain 536 into an E. coli K-12 recipient. In transconjugants, PAI II536 existed either as a cytoplasmic circular intermediate (CI) or integrated site-specifically into the recipient's chromosome at the leuX tRNA gene. This locus is the chromosomal integration site of PAI II536 in UPEC strain 536. From the E. coli K-12 recipient, the chromosomal PAI II536 construct as well as the CIs could be successfully remobilised and inserted into leuX in a PAI II536 deletion mutant of E. coli 536. Conclusions Our results corroborate that mobilisation and conjugal transfer may contribute to evolution of bacterial pathogens through horizontal transfer of large chromosomal regions such as PAIs. Stabilisation of these mobile genetic elements in the bacterial chromosome result from selective loss of mobilisation and transfer functions of genomic islands.

2011-01-01

394

Genomic organization and reproductive regulation of a large lipid transfer protein in the varroa mite, Varroa destructor (Anderson & Trueman).  

PubMed

The complete genomic region and corresponding transcript of the most abundant protein in phoretic varroa mites, Varroa destructor (Anderson & Trueman), were sequenced and have homology with acarine hemelipoglycoproteins and the large lipid transfer protein (LLTP) super family. The genomic sequence of VdLLTP included 14 introns and the mature transcript coded for a predicted polypeptide of 1575 amino acid residues. VdLLTP shared a minimum of 25% sequence identity with acarine LLTPs. Phylogenetic assessment showed VdLLTP was most closely related to Metaseiulus occidentalis vitellogenin and LLTP proteins of ticks; however, no heme binding by VdLLTP was detected. Analysis of lipids associated with VdLLTP showed that it was a carrier for free and esterified C12 -C22 fatty acids from triglycerides, diacylglycerides and monoacylglycerides. Additionally, cholesterol and ?-sitosterol were found as cholesterol esters linked to common fatty acids. Transcript levels of VdLLTP were 42 and 310 times higher in phoretic female mites when compared with males and quiescent deutonymphs, respectively. Coincident with initiation of the reproductive phase, VdLLTP transcript levels declined to a third of those in phoretic female mites. VdLLTP functions as an important lipid transporter and should provide a significant RNA interference target for assessing the control of varroa mites. PMID:23834736

Cabrera, A R; Shirk, P D; Duehl, A J; Donohue, K V; Grozinger, C M; Evans, J D; Teal, P E A

2013-07-03

395

Quantized Rotation of Atoms from Photons with Orbital Angular Momentum  

SciTech Connect

We demonstrate the coherent transfer of the orbital angular momentum of a photon to an atom in quantized units of ({Dirac_h}/2{pi}), using a 2-photon stimulated Raman process with Laguerre-Gaussian beams to generate an atomic vortex state in a Bose-Einstein condensate of sodium atoms. We show that the process is coherent by creating superpositions of different vortex states, where the relative phase between the states is determined by the relative phases of the optical fields. Fur