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1

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

2

Neutron electric form factor at large momentum transfer  

NASA Astrophysics Data System (ADS)

Based on the recent, high-precision data for elastic electron scattering from protons and deuterons, at relatively large momentum transfer Q2, we determine the neutron electric form factor up to Q2 = 3.5 GeV2. The values obtained from the data (in the framework of the nonrelativistic impulse approximation) are larger than commonly assumed and are in good agreement with the Gari-Krümpelmann parametrization of the nucleon electromagnetic form factors.

Tomasi-Gustafsson, E.; Rekalo, M. P.

2001-07-01

3

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

4

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

5

Study of Quark Flavor-Dependence in Exclusive Reactions at Large Momentum Transfers.  

National Technical Information Service (NTIS)

The measurement of exclusive reactions at large momentum transfers provides an important testing ground for models of hard quark-quark scattering. We have measured cross sections or set upper limits for 12 meson-bryon ( pi /sup +-/p -> p pi /sup +-/, p/rh...

A. S. Carroll R. Appel D. S. Barton G. Bunce M. Kmit

1988-01-01

6

Study of quark flavor-dependence in exclusive reactions at large momentum transfers  

Microsoft Academic Search

The measurement of exclusive reactions at large momentum transfers provides an important testing ground for models of hard quark-quark scattering. We have measured cross sections or set upper limits for 12 meson-bryon (..pi..\\/sup +-\\/p ..-->.. p..pi..\\/sup +-\\/, p\\/rho\\/\\/sup +-\\/, ..pi..\\/sup +\\/..delta..\\/sup +-\\/, K\\/sup +\\/..sigma..\\/sup +-\\/, ..pi..\\/sup \\/minus\\/\\/p ..-->.. ..lambda..°\\/..sigma..°K°, K\\/sup +-\\/p ..-->.. pK\\/sup +-\\/) and 2 baryon-baryon (p\\/sup +-\\/p ..-->..

A. S. Carroll; R. Appel; D. S. Barton; G. Bunce; M. Kmit; Y. I. Makdisi; B. R. Baller; G. C. Blazey; H. Courant; G. Fang

1988-01-01

7

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

Microsoft Academic Search

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 High Momentum Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to

David Abbott; Abdellah Ahmidouch; Heinz Anklin; J. Arvieux; Jacques Ball; S. Beedoe; Elizabeth Beise; Louis Bimbot; Werner Boeglin; Herbert Breuer; P. Brindza; R. Carlini; N. S. Chant; S. Danagoulian; K. Dow; J.-E. Ducret; J. Dunne; L. Ewell; L. Eyraud; C. Furget; M. Garçon; R. Gilman; C. Glashausser; P. Gueye; K. Gustafsson; K. Hafidi; 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. Réal; 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

2000-01-01

8

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

9

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

10

Postcollision effects in target ionization by ion impact at large momentum transfer  

NASA Astrophysics Data System (ADS)

We have measured and calculated fully differential cross sections for target ionization in 16-MeV O7++He and 24-MeV O8++Li collisions. As in previous studies, in the case of the He target we observe a pronounced forward shift in the angular distribution of the electrons relative to the direction of the momentum transfer q at small q (q < 1 a.u.). An unexpected result is that we also find a strong forward shift at large q (q > 2 a.u.), while at intermediate q this shift becomes very weak or even turns into a backward shift. For the Li target, in contrast, the forward shift monotonically increases with increasing q. These observations are qualitatively reproduced by our calculations. The comparison to theory suggests that at large q the forward shift is due to the postcollision interaction between the outgoing projectile and the ejected electron, but at small q it is mostly due to an interplay between the projectile-target core interaction and the electron-target core interaction.

Schulz, M.; Najjari, B.; Voitkiv, A. B.; Schneider, K.; Wang, X.; Laforge, A. C.; Hubele, R.; Goullon, J.; Ferreira, N.; Kelkar, A.; Grieser, M.; Moshammer, R.; Ullrich, J.; Fischer, D.

2013-08-01

11

Studies of P-shell nuclei by large momentum transfer electron scattering  

SciTech Connect

The use of transverse electron scattering as a technique for studying the structure of 1p-shell nuclei is briefly reviewed. At the present time there exist unresolved problems such as missing strength in comparison with shell model calculations. At the same time, the observed cross sections fall off more slowly than expected at high momentum transfers. The derivation of phenomenological wave functions for the ground and 2.313 MeV states in /sup 14/N is described. 18 references.

Hicks, R.S.

1984-01-01

12

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

Microsoft Academic Search

The three tensor polarization components (t20, t21 and t22) of the recoil deuteron in elastic electron-deuteron scattering have been measured in the range of 4-momentum transfer Q = 4.1-6.8 fm-1. The experiment was performed with the multi-GeV, high intensity electron beam available at the Jefferson Laboratory and using the tensor deuteron polarimeter POLDER. These new data are used to separate

C. Furget; D. 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; M. Garcon; R. Gilman; C. Glashausser; P. Gueye; K. Gustafsson; K. Hafidi; A. Honneger; J. Jourdan; S. Kox; G. Kumbarski; L. Lu; A. Lung; D. Mack; P. Markowitz; J. McIntyre; D. Meekins; F. Merchez; J. Mitchell; S. Mtingwa; H. Mrktchyan; D. Pitz; L. Qin; R. Ransome; J. S. Real; P. G. Roos; P. Rutt; W. Schmidt; R. Sawafta; S. Stepanyan; E. J. Stephenson; 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

1998-01-01

13

Diffractive photoproduction of J\\/ ? mesons with large momentum transfer at HERA  

Microsoft Academic Search

The diffractive photoproduction of J\\/? mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb?1. The differential cross section d?(?p?J\\/?Y)\\/dt is studied in the range 2<|t|<30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon–proton centre-of-mass

A. Aktas; V. Andreev; T. Anthonis; A. Astvatsatourov; A. Babaev; S. Backovic; J. Bähr; P. Baranov; E. Barrelet; W. Bartel; S. Baumgartner; J. Becker; M. Beckingham; A. Beglarian; O. Behnke; O. Behrendt; A. Belousov; Ch. Berger; T. Berndt; J. C. Bizot; J. Böhme; M.-O. Boenig; V. Boudry; J. Bracinik; W. Braunschweig; V. Brisson; H.-B. Bröker; D. P. Brown; D. Bruncko; F. W. Büsser; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; A. J. Campbell; S. Caron; F. Cassol-Brunner; V. Chekelian; D. Clarke; C. Collard; J. G. Contreras; Y. R. Coppens; J. A. Coughlan; M.-C. Cousinou; B. E. Cox; G. Cozzika; J. Cvach; J. B. Dainton; W. D. Dau; K. Daum; M. Davidsson; B. Delcourt; N. Delerue; R. Demirchyan; A. De Roeck; E. A. De Wolf; C. Diaconu; J. Dingfelder; P. Dixon; V. Dodonov; J. D. Dowell; A. Dubak; C. Duprel; G. Eckerlin; V. Efremenko; S. Egli; R. Eichler; F. Eisele; M. Ellerbrock; E. Elsen; M. Erdmann; W. Erdmann; P. J. W. Faulkner; L. Favart; A. Fedotov; R. Felst; J. Ferencei; S. Ferron; M. Fleischer; P. Fleischmann; Y. H. Fleming; G. Flucke; A. Fomenko; I. Foresti; J. Formánek; G. Franke; G. Frising; E. Gabathuler; K. Gabathuler; J. Garvey; J. Gassner; R. Gerhards; C. Gerlich; S. Ghazaryan; L. Goerlich; N. Gogitidze; S. Gorbounov; C. Grab; V. Grabski; H. Grässler; T. Greenshaw; G. Grindhammer; D. Haidt; L. Hajduk; J. Haller; B. Heinemann; G. Heinzelmann; R. C. W. Henderson; H. Henschel; O. Henshaw; R. Heremans; G. Herrera; I. Herynek; M. Hildebrandt; K. H. Hiller; J. Hladký; P. Höting; D. Hoffmann; R. Horisberger; A. Hovhannisyan; M. Ibbotson; M. Jacquet; L. Janauschek; X. Janssen; V. Jemanov; L. Jönsson; C. Johnson; D. P. Johnson; M. A. S. Jones; H. Jung; D. Kant; M. Kapichine; J. Katzy; F. Keil; N. Keller; J. Kennedy; I. R. Kenyon; C. Kiesling; M. Klein; C. Kleinwort; T. Kluge; G. Knies; B. Koblitz; S. D. Kolya; V. Korbel; P. Kostka; R. Koutouev; A. Koutov; J. Kroseberg; K. Krüger; J. Kueckens; T. Kuhr; M. P. J. Landon; W. Lange; T. Laštovi?ka; P. Laycock; A. Lebedev; B. Leißner; R. Lemrani; V. Lendermann; S. Levonian; B. List; E. Lobodzinska; N. Loktionova; R. Lopez-Fernandez; V. Lubimov; H. Lueders; S. Lüders; D. Lüke; L. Lytkin; A. Makankine; N. Malden; E. Malinovski; S. Mangano; P. Marage; J. Marks; R. Marshall; H.-U. Martyn; J. Martyniak; S. J. Maxfield; D. Meer; A. Mehta; K. Meier; A. B. Meyer; H. Meyer; J. Meyer; S. Michine; D. Milstead; S. Mohrdieck; F. Moreau; A. Morozov; J. V. Morris; K. Müller; P. Mur??n; V. Nagovizin; B. Naroska; J. Naumann; Th. Naumann; P. R. Newman; F. Niebergall; C. Niebuhr; D. Nikitin; G. Nowak; M. Nozicka; B. Olivier; J. E. Olsson; D. Ozerov; V. Panassik; C. Pascaud; G. D. Patel; M. Peez; E. Perez; A. Petrukhin; J. P. Phillips; D. Pitzl; R. Pöschl; B. Povh; N. Raicevic; J. Rauschenberger; P. Reimer; B. Reisert; C. Risler; E. Rizvi; P. Robmann; R. Roosen; A. Rostovtsev; S. Rusakov; K. Rybicki; D. P. C. Sankey; E. Sauvan; S. Schätzel; J. Scheins; F.-P. Schilling; D. Schmidt; S. Schmidt; M. Schneider; L. Schoeffel; A. Schöning; V. Schröder; H.-C. Schultz-Coulon; K. Sedlák; F. Sefkow; I. Sheviakov; L. N. Shtarkov; Y. Sirois; T. Sloan; P. Smirnov; Y. Soloviev; D. South; V. Spaskov; A. Specka; H. Spitzer; R. Stamen; B. Stella; J. Stiewe; I. Strauch; U. Straumann; G. Thompson; P. D. Thompson; F. Tomasz; D. Traynor; P. Truöl; G. Tsipolitis; I. Tsurin; J. Turnau; J. E. Turney; E. Tzamariudaki; A. Uraev; M. Urban; A. Usik; S. Valkár; A. Valkárová; C. Vallée; P. Van Mechelen; A. Vargas Trevino; S. Vassiliev; Y. Vazdik; C. Veelken; A. Vest; A. Vichnevski; V. Volchinski; K. Wacker; J. Wagner; R. Wallny; B. Waugh; G. Weber; R. Weber; D. Wegener; C. Werner; N. Werner; M. Wessels; B. Wessling; M. Winde; G.-G. Winter; Ch. Wissing; E.-E. Woehrling; A. C. Wyatt; J. Žá?ek; J. Zálešák; Z. Zhang; A. Zhokin; F. Zomer; M. Zur Nedden

2003-01-01

14

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

15

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

16

Electromagnetic structure of the proton, pion, and kaon by high-precision form factor measurements at large timelike momentum transfers.  

PubMed

The electromagnetic structure of the lightest hadrons, proton, pion, and kaon is studied by high-precision measurements of their form factors for the highest timelike momentum transfers of |Q2|=s=14.2 and 17.4??GeV2. Data taken with the CLEO-c detector at sqrt[s]=3.772 and 4.170 GeV, with integrated luminosities of 805 and 586??pb(-1), respectively, have been used to study e+ e- annihilations into ?+ ?-, K+ K-, and pp. The dimensional counting rule prediction that at large Q2 the quantity Q2F(Q2) for pseudoscalar mesons is nearly constant, and should vary only weakly as the strong coupling constant ?S(Q2) is confirmed for both pions and kaons. However, the measurements are in strong quantitative disagreement with the predictions of the existing quantum chromodynamics-based models. For protons, it is found that the timelike form factors continue to remain nearly twice as large as the corresponding spacelike form factors measured in electron elastic scattering, in significant violation of the expectation of their equality at large Q2. Further, in contrast to pions and kaons, a significant difference is observed between the values of the corresponding quantity |Q4|G(M)(|Q2|)/?(p) for protons at |Q2|=14.2 and 17.4??GeV2. The results suggest the constancy of |Q2|G(M)(|Q2|)/?(p), instead, at these large |Q2|. PMID:23383892

Seth, Kamal K; Dobbs, S; Metreveli, Z; Tomaradze, A; Xiao, T; Bonvicini, G

2013-01-11

17

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

18

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

19

Linear momentum transfer in nonrelativistic nucleus-nucleus collisions  

NASA Astrophysics Data System (ADS)

The systematic behavior of linear momentum transfer from projectile to target in nonrelativistic nucleus-nucleus collisions has been studied using the results of fission-fragment angular-correlation measurements on uranium target nuclei. Data for 4He, 12C, 16O, and 20Ne projectiles have been analyzed over an energy range which extends well above the interaction barrier. The data illustrate the division of the total reaction cross section into two primary components: one associated with ~ 90 percent or greater linear momentum transfer and the other involving much smaller amounts of linear momentum transfer. The former is attributed to fusionlike collisions and the latter to peripheral collisions. The minimum between these two components corresponds to a linear momentum transfer of about 50 percent. It is observed that the ratio of fusionlike collisions to the total reaction cross section decreases regularly as a function of both increasing bombarding energy and projectile mass. From comparison of the experimental fission-fragment angular correlation functions with the predictions of complete fusion kinematics, it is shown that above 10 MeV/nucleon, the experimental definition of complete fusion is complicated by the increasing probability for large, but incomplete, linear momentum transfer collisions. Estimates of critical angular momenta derived from these data do not show any major disagreement with rotating-liquid-drop predictions. NUCLEAR REACTIONS, FISSION Studied systematics of fission-fragment angular correlation measurements from uranium target nuclei. Deduced linear momentum transfer distributions, fusionlike collision and complete fusion probabilities, and critical angular momenta.

Viola, V. E., Jr.; Back, B. B.; Wolf, K. L.; Awes, T. C.; Gelbke, C. K.; Breuer, H.

1982-07-01

20

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

21

Ultrafast angular momentum transfer in multisublattice ferrimagnets  

NASA Astrophysics Data System (ADS)

Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. However, one of the unsolved questions is that of conservation of the total angular momentum during the ultrafast demagnetization. Here we report the ultrafast transfer of angular momentum during the first hundred femtoseconds in ferrimagnetic Co0.8Gd0.2 and Co0.74Tb0.26 films. Using time-resolved X-ray magnetic circular dichroism allowed for time-resolved determination of spin and orbital momenta for each element. We report an ultrafast quenching of the magnetocrystalline anisotropy and show that at early times the demagnetization in ferrimagnetic alloys is driven by the local transfer of angular momenta between the two exchange-coupled sublattices while the total angular momentum stays constant. In Co0.74Tb0.26 we have observed a transfer of the total angular momentum to an external bath, which is delayed by ~150?fs.

Bergeard, N.; López-Flores, V.; Halté, V.; Hehn, M.; Stamm, C.; Pontius, N.; Beaurepaire, E.; Boeglin, C.

2014-03-01

22

Ultrafast angular momentum transfer in multisublattice ferrimagnets.  

PubMed

Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. However, one of the unsolved questions is that of conservation of the total angular momentum during the ultrafast demagnetization. Here we report the ultrafast transfer of angular momentum during the first hundred femtoseconds in ferrimagnetic Co0.8Gd0.2 and Co0.74Tb0.26 films. Using time-resolved X-ray magnetic circular dichroism allowed for time-resolved determination of spin and orbital momenta for each element. We report an ultrafast quenching of the magnetocrystalline anisotropy and show that at early times the demagnetization in ferrimagnetic alloys is driven by the local transfer of angular momenta between the two exchange-coupled sublattices while the total angular momentum stays constant. In Co0.74Tb0.26 we have observed a transfer of the total angular momentum to an external bath, which is delayed by ~150?fs. PMID:24614016

Bergeard, N; López-Flores, V; Halté, V; Hehn, M; Stamm, C; Pontius, N; Beaurepaire, E; Boeglin, C

2014-01-01

23

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

24

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

25

Linear momentum and angular momentum transfer in the reactions of 16O with 154Sm  

NASA Astrophysics Data System (ADS)

From coincidence measurements between projectile-like fragments or heavy residues and their associated ? rays, the angular momentum transfers for a variety of incomplete fusion reactions of 180 and 310 MeV 16O with 154Sm have been derived. At the higher energy, the correlation between angular momentum transfer and linear momentum transfer has been obtained over the entire range of linear momentum transfer. A comparison of the data with calculations of both the sum-rule and geometric overlap models indicates that each makes reasonable predictions of the observed trend even though the assumptions of the models are quite different, and very different initial partial waves are predicted to contribute to particular reaction channels. This results primarily from prescriptions relating fractional mass transfer to fractional angular momentum transfer. The reconstruction of the initial partial wave distributions from correlated measurements of linear momentum and angular momentum transfers is addressed. Comparisons are also made with more recent model calculations which focus on nucleon-nucleon scattering as the mechanism of momentum transfer.

Namboodiri, M. N.; Choudhury, R. K.; Adler, L.; Bronson, J. D.; Fabris, D.; Garg, U.; Gonthier, P. L.; Hagel, K.; Haenni, D. R.; Lui, Y. W.; Majka, Z.; Mouchaty, G.; Murakami, T.; Natowitz, J. B.; Nebbia, G.; Schmitt, R. P.; Simon, S.; Sullivan, J. P.; Youngblood, D. H.

1987-01-01

26

Ion momentum and energy transfer rates for charge exchange collisions  

NASA Technical Reports Server (NTRS)

The rates of momentum and energy transfer have been obtained for charge exchange collisions between ion and neutral gases having arbitrary Maxwellian temperatures and bulk transport velocities. The results are directly applicable to the F-region of the ionosphere where 0+ - 0 charge is the dominant mechanism affecting ion momentum and energy transfer.

Horwitz, J.; Banks, P. M.

1973-01-01

27

Onset of incomplete momentum transfer in fusion-like processes  

SciTech Connect

Velocity spectra of evaporation residues from the reactions /sup 16/O + Al, Ca, and Ni have been measured at bombarding energies of 8.8, 13.6, and 19.6 MeV/u. Comparison with statistical model predictions shows clear evidence for the onset of incomplete momentum transfer at about 5 MeV/u above the interaction barrier. To first order, the results are similar for all targets, suggesting that the missing momentum is mainly associated with the projectile. The fraction of transferred linear momentum appears to decrease linearly with increasing relative velocity of the colliding nuclei at the barrier.

Stokstad, R.G.; Chan, Y.; Murphy, M.; Tserruya, I.; Wald, S.; Budzanowski, A.

1983-03-01

28

Momentum transfer over the coastal zone  

NASA Astrophysics Data System (ADS)

Spatial variations of surface stress over the coastal shoaling zone are studied offshore of Duck, North Carolina, by the LongEZ research aircraft, equipped to measure both atmospheric turbulence and oceanic waves. We find that the spatial variation of the friction velocity with offshore distance is much larger with offshore flow than with onshore flow. In general, the mean square slope of the short waves (wavelength shorter than 2 m) decreases with offshore distance, while the mean square slope of the long waves (wavelength longer than 2 m) increases with offshore distance. With onshore flow the friction velocity is strongly correlated with surface waves. In addition, the variation of the neutral drag coefficient is well correlated with the atmospheric bulk Richardson number. With offshore flow the observed momentum flux significantly decreases with offshore distance. Within the first few kilometer offshore, the relationship between the friction velocity and the mean square slope of the short waves and the relationship between the neutral drag coefficient and the atmospheric bulk Richardson number are obscured by the direct influence of the upstream land surface on the measured turbulence. These relationships for offshore flow agree well with those for onshore flow if the fetch is beyond the immediate influence of the land surface. The results in this study suggests that the effects of the strong turbulence advected from over the nearby land surface in offshore flow may lead to ambiguous physical interpretation of the correlation between the momentum flux and the wave state.

Sun, Jielun; Vandemark, Douglas; Mahrt, Larry; Vickers, Dean; Crawford, Timothy; Vogel, Christoph

2001-01-01

29

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

30

Modelling of globular transfer considering momentum flux in GMAW  

NASA Astrophysics Data System (ADS)

The static force balance model (SFBM) has been widely used to analyse metal transfer in gas metal arc welding (GMAW). Although the SFBM is capable of predicting the detaching drop size in the globular mode with reasonable accuracy, discrepancy between the calculated and experimental results increases with current. In order to reduce discrepancy, the SFBM is modified in this work by introducing the momentum flux. The momentum flux is generated by the axial fluid flow within the drop, which is induced by the pinch pressure. While the momentum flux has negligible effects on metal transfer in the low current range, it increases with current and becomes compatible with the electromagnetic force in the high current range. The modified force balance model predicts the experimental results more accurately than the SFBM and extends its application to the projected mode of the spray mode.

Arif, Nabeel; Lee, Jae Hak; Yoo, Choong Don

2008-10-01

31

Proton-Deuteron Elastic Scattering at High Momentum Transfers.  

National Technical Information Service (NTIS)

An experimental and theoretical investigation of proton-deuteron elastic scattering at high momentum transfers is presented. The differential cross sections for backward elastic scattering at incident proton kinetic energies of 1.0, 1.3, and 1.5 GeV were ...

E. Coleman

1966-01-01

32

Large Momentum Pairing in One-Dimensional Systems.  

National Technical Information Service (NTIS)

The primary objective was to determine the correlation function describing large momentum pairing. A comparison of this correlation function with other correlations (such as singlet pairing, triplet pairing, charge density wave, and spin density wave) is ...

D. W. Allender

1987-01-01

33

Kaon semi-leptonic form factor at zero momentum transfer in finite volume  

NASA Astrophysics Data System (ADS)

Using Chiral Perturbation Theory, we obtain the kaon semi-leptonic vector form factor in finite volume at a generic momentum transfer, q 2, up to one-loop order. At first we confirm the lattice observation that the contribution of the heavy pseudo-Goldstone boson in the finite-volume corrections at zero momentum transfer is unimportant. We then evaluate the form factor at q 2 = 0 numerically and compare our results with the present lattice data. It turns out that our ChPT results are comparable with the lattice data to some extent. The formula for the finite-volume corrections obtained for the form factor at momentum transfer q 2 provides a tool for lattice data in order to extrapolate at large lattice size.

Ghorbani, Karim; Ghorbani, Hossein

2013-10-01

34

Zero Momentum Transfer limit of Generalized Oscillator Strengths from Ions.  

NASA Astrophysics Data System (ADS)

Zero Momentum Transfer limit of Generalized Oscillator Strengths from Ions. It is well known that generalized oscillator strengths for optically allowed transitions converge to the optical oscillator strength (OOS) limit if the momentum transfer q tends to zero. According to the Lassettre’s theorem [1], they become equal to the OOS at q=0 regardless of the electron energy. We show that for scattering from ions the Lassettre’s theorem is not valid. We farther show, that the limit q=0 is given exactly by the Coulomb-Born GOS at all energies. Using the Coulomb-Born GOS we have obtained an analytical expression for the limit q=0, which strongly depends on energy and tends to the OOS only if the energy of the projectile electron tends to infinity. An analytical expression for the forward scattering is also obtained. [1] Lassetre E N, Skerbele A and Dillon M A 1969 J Chem. Phys. 50 1829.

Macek, J. H.; Avdonina, N. B.

2001-05-01

35

?*N?N(1710) transition at high momentum transfer  

NASA Astrophysics Data System (ADS)

In a relativistic quark model we study the structure of the N(1710) resonance, and the ?*N?N(1710) reaction focusing on the high momentum transfer region, where the valence quark degrees of freedom are expected to be dominant. The N(1710) resonance, a state with spin 1/2 and positive parity (JP=1/2+), can possibly be interpreted as the second radial excitation of the nucleon, after the Roper, N(1440). We calculate the ?*N?N(1710) helicity amplitudes, and predict that they are almost identical to those of the ?*N?N(1440) reaction in the high momentum transfer region. Thus, future measurement of the helicity amplitudes for the ?*N?N(1710) reaction can give a significant hint on the internal structure of the N(1710) state.

Ramalho, G.; Tsushima, K.

2014-04-01

36

Momentum and heat transfer in a complex recirculating flow  

Microsoft Academic Search

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

Rhee

1987-01-01

37

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 TeV² via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in excellent agreement with a prediction based on a reaction mechanism in which the photon interacts with a single quark

D. J. Hamilton; Vahe Mamyan

2004-01-01

38

Parton physics from large-momentum effective field theory  

NASA Astrophysics Data System (ADS)

Parton physics, when formulated as light-front correlations, are difficult to study non-perturbatively, despite the promise of light-front quantization. Recently an alternative approach to partons have been proposed by re-visiting original Feynman picture of a hadron moving at asymptotically large momentum. Here I formulate the approach in the language of an effective field theory for a large hadron momentum P in lattice QCD, LaMET for short. I show that using this new effective theory, parton properties, including light-front parton wave functions, can be extracted from lattice observables in a systematic expansion of 1/ P, much like that the parton distributions can be extracted from the hard scattering data at momentum scales of a few GeV.

Ji, XiangDong

2014-07-01

39

Parton physics from large-momentum effective field theory  

NASA Astrophysics Data System (ADS)

Parton physics, when formulated as light-front correlations, are difficult to study non-perturbatively, despite the promise of light-front quantization. Recently an alternative approach to partons have been proposed by re-visiting original Feynman picture of a hadron moving at asymptotically large momentum. Here I formulate the approach in the language of an effective field theory for a large hadron momentum P in lattice QCD, LaMET for short. I show that using this new effective theory, parton properties, including light-front parton wave functions, can be extracted from lattice observables in a systematic expansion of 1/P, much like that the parton distributions can be extracted from the hard scattering data at momentum scales of a few GeV.

Ji, XiangDong

2014-05-01

40

Polarization Transfer in Proton Compton Scattering at High Momentum Transfer  

NASA Astrophysics Data System (ADS)

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 mechanism in which the photon interacts with a single quark carrying the spin of the proton.

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

2005-06-01

41

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

42

Momentum transfer cross sections for the heavy noble gases  

NASA Astrophysics Data System (ADS)

We present momentum transfer cross sections for elastic electron scattering from argon, krypton and xenon atoms over the energy range from zero to 1 keV. These have been calculated using the Dirac equations with a relativistic complex optical potential which includes polarization of the target atom by the incident electron and allows for the absorption of some of the incident electron flux into channels representing excitation and ionization of the atom. In order to aid in plasma modelling calculations, we provide simple analytic fits to these cross sections as well as to the elastic scattering cross sections. Comparisons are made with previous experimental and theoretical results.

McEachran, R. P.; Stauffer, A. D.

2014-06-01

43

Low energy e-Ar momentum transfer cross-section  

SciTech Connect

Recent work has shown that solutions of the Boltzmann equation which use the so called {open_quotes}two-term{close_quotes} approximation provide an inadequate description of the transverse diffusion of electrons in argon gas at low values of E/N, contrary to earlier evidence. Previous determinations of the momentum transfer cross section for argon from the analysis of transport data have used two-term codes in good faith. Progress towards the determination of a new cross section in the energy range O - 4 eV, including an analysis of the energy dependence of the uncertainty in the derived cross section is reported.

Brennan, M.J.

1992-12-01

44

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

45

Observation of inclusive. omega. production at large transverse momentum  

SciTech Connect

We have observed the production of ..omega.. mesons at large transverse momentum produced in 200-GeV/c pBe interactions. The ratio of inclusive production of ..omega.. to ..pi../sup 0/ at transverse momenta above 2.2 GeV/c is 0.44 +- 0.08 near x=0. The upper limit for eta' to eta production is <1.4 in the same kinematic region.

Donaldson, G.J.; Gordon, H.A.; Lai, K.; Barnes, A.V.; Mellema, D.J.; Tollestrup, A.V.; Walker, R.L.; Dahl, O.I.; Johnson, R.A.; Ogawa, A.; Pripstein, M.; Shannon, S.R.

1980-02-01

46

Hydrophobicity, heat transfer, and momentum transfer at hard and soft aqueous interfaces  

NASA Astrophysics Data System (ADS)

Advancements in science and technology increasingly involve systems operating at the nanoscale. Interfaces are often present in these systems. Nanoscopic interfaces are ubiquitous in biological systems, nanofluidic devices, and integrated circuits. Properties at the interface may be quite different from the bulk, and in fact a true bulk may not be present in these systems. At the nanoscale the ratio of interface to volume is large, and the interface may have the dominant role in determining system behavior. Interfacial characteristics and their connection to interfacial properties are the focus of my thesis. Using molecular simulations of model interfaces we characterize how properties like chemistry, composition, and topography affect such phenomena such as hydrophobicity, heat transfer, and momentum transport at the nanoscale. An interface is defined simply as where two materials meet and a change in some structure or order parameter is observed. In aqueous systems, the type studied here, these changes are relatively sharp and occur within a distance of nanometers. Water molecules near the interface are expected to display sensitivity to the underlying surface. Indeed, water near a hydrophobic surface is more deformable and has greater fluctuations. The hydrophobicity of chemically heterogeneous surfaces and proteins are characterized using these nanoscopic measures. We find the effect of mixing hydrophobic and hydrophobic head group chemistries is asymmetric, i.e., it is easier to make a hydrophobic surface hydrophilic than the reverse. The role of hydrogen bonding in hydrophobic and ion hydration is also characterized using a short range water model. Hydrophobic and ion hydration are reasonably captured with the short range water model. These studies show the importance of chemical composition and local hydrogen bonding in determining surface hydrophobicity. Interfaces also lead to anomalous behavior in heat and momentum transport. Interfaces disrupt local structure and create boundary resistances that manifest in temperature discontinuities and interfacial slip. We explore the effects of chemical heterogeneity, nanoscale surface roughness, and directionality on thermal conductance across model solid-water interfaces. Interfacial conductance is directly influenced by the coupling strength or wettability of the surface. For chemically mixed surfaces, interfacial conductance does not precisely match with wettability. Surface roughness in general enhances conductance, but the improvement cannot be completely attributed to increased solvent accessible surfaced area. Momentum transport displays similar discontinuities at aqueous interfaces. These effects can be reduced through the use of osmolytes. Collectively this work highlights the influence of interfaces on heat and momentum transport. Insights are provided for modifying interfacial behavior and altering the property of interest.

Acharya, Hari

47

Evidence for unmediated momentum transfer between light waves  

NASA Astrophysics Data System (ADS)

Dowling and Gea-Benacloche (1992) proved mathematically that "...under certain circumstances, it is possible to consistently interpret interference as the specular reflection of two electromagnetic waves off each other..." Combining experiment, model, and logic, we confirm this statement. Contrary to the supposition that electromagnetic waves/photons cannot interact, it is possible to interpret the results to indicate that identical out-of-phase waves and opposite polarity photons repel or, at least, cannot pass through each other. No energy is detected in the dark/null zones of wave interference. Because energy appears to be absent, the exchange of momentum through the null zone must redirect/repel light waves into bright zones. Our Zero-Slit Experiment (ZSX) provides diffraction-free interference in air between two portions of a divided laser beam. This experiment was initially an attempt to completely cancel a section of these two beams by recombining them in air when they are 180° out-of-phase. We have reduced interference patterns close to a double-bright zone (with 3 null zones), but no further. Within the limits of laser-beam spreading, we have studied the resulting interference patterns and compared them with models of collision between identical particles. It may be possible to distinguish light from other Bosons, if the model of opposite phases repelling is valid. An EM field-line model of the photon is presented to explain the interactions needed to produce momentum transfer.

Hudgins, W. R.; Meulenberg, A.; Ramadass, S.

2011-09-01

48

Square vortex solitons with a large angular momentum  

NASA Astrophysics Data System (ADS)

We show the existence of square-shaped optical vortices with a large value of the angular momentum hosted in finite-size laser beams which propagate in nonlinear media with a cubic-quintic nonlinearity. The light profiles take the form of rings with sharp boundaries and variable sizes depending on the power carried. Our stability analysis shows that these light distributions remain stable when they propagate, probably for unlimited values of the angular momentum, provided the hosting beam is wide enough. This happens if the peak amplitude approaches a critical value which only depends on the nonlinear refractive index of the material. A variational approach allows us to calculate the main parameters involved. Our results add extra support to the concept of surface tension of light beams that can be considered as a trace of the existence of a liquid of light.

Michinel, Humberto; Salgueiro, José R.; Paz-Alonso, María J.

2004-12-01

49

Angular Momentum Transfer in Vela-like Pulsar Glitches  

NASA Astrophysics Data System (ADS)

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 ?, Rs = 10 km, \\dot{\\Omega }=\\dot{\\Omega }_Vela=-10^{-10} Hz s-1), we find that maximum pinning forces of order fm ? 1015 dyn cm-1 can accumulate ?L gl ? 1040 erg s of superfluid angular momentum, and release it to the crust at intervals ?t gl ? 3 years. This estimate of ?L 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, ??gl and \\Delta \\dot{\\Omega }_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.

2011-12-01

50

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

51

Energy and momentum transfer to a 'fully-clamped' elastic plate in an air-blast  

NASA Astrophysics Data System (ADS)

The momentum transfer by a planar wave impinging upon a rigid, free-standing plate in water, a largely incompressible medium, is well understood [1]. Kambouchev et al. [2] extended the results of Taylor [1] to include the nonlinear effects of compressibility whilst Hutchinson [3] has recently addressed the issues of energy and momentum transfer to a rigid, free-standing plate. In this paper, key conclusions from the aforementioned studies are critically re-examined in the context of a 'fully-clamped' elastic plate. The dynamic response of an elastic plate is represented by an equivalent single-degree-of-freedom (SDOF) system. A numerical method based on a Lagrangian formulation of the Euler equations of compressible flow and conventional shock-capturing techn iques, similar to that employed in [2, 3], were employed to solve numerically the interaction between the air blast wave and elastic plate. Particular emphasis is placed on elucidating the energy and momentum transfer to a 'fully-clamped' elastic plate compared to its rigid, free-standing counterpart, and on whether enhancement in the beneficial effects of FSI as a result of fluid compressibility remains and to what extent.

Yuan, Y.; Tan, P. J.

2013-07-01

52

Annual Session of Indian Institute of Chemical Engineers (34th), December 16-19, 1981. Preprints of Papers, Volume 1. Momentum Transfer - Heat Transfer - Mass Transfer.  

National Technical Information Service (NTIS)

The Papers presented at the 34th Annual Session under Vol. I deal with Momentum transfer, Heat transfer, Mass transfer. Among topics included under momentum transfer are hold up studies in liquid-liquid ejector system, non-Newtonial flow in packed bed of ...

1981-01-01

53

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

54

Momentum transfer dependence of medium effects in the (e,e{prime}) longitudinal response  

SciTech Connect

Recent {sup 56}Fe(e,e{prime}) data at momentum transfer {vert_bar}{bar q}{vert_bar} = 1.14 GeV display behavior which is qualitatively different from that of lower momentum transfers. An explanation of this difference is offered based on an analysis of the longitudinal response in nuclear matter. An ansatz is made for the momentum dependence of the nucleon self-energy functions in the nuclear medium which suppresses medium effects for momenta above the nucleon mass scale. This suppression is shown to improve the agreement with the high momentum transfer data, and offers a motivation for further experimental investigation in the momentum transfer region between 0.5 and 1.0 GeV.

Frank, M.R. [Hampton Univ., VA (United States). Dept. of Physics]|[Continuous Electron Beam Accelerator Facility, Newport News, VA (United States)

1993-12-31

55

Scale invariant 0(g(sup 4)) Lipatov kernels at non-zero momentum transfer.  

National Technical Information Service (NTIS)

We summarize recent work on the evaluation of the scale invariant next-to-leading order Lipatov kernel, constructed via transverse momentum diagrams. At zero momentum transfer the square of the leading-order kernel appears together with an additional comp...

C. Coriano A. R. White R. R. Parwani

1996-01-01

56

Momentum Transfer Approximation for the Calculation of Molecular Transition Probabilities in High Temperature Gas Kinetic Collisions.  

National Technical Information Service (NTIS)

A straightforward method, the momentum transfer approximation, is proposed for the determination of the probabilities of inelastic (non-electronic) processes in high temperature gas kinetic collisions. The approximation is applicable to polyatomic as well...

A. P. Proudian

1965-01-01

57

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

58

Nuclear fragmentation energy and momentum transfer distributions in relativistic heavy-ion collisions  

NASA Technical Reports Server (NTRS)

An optical model description of energy and momentum transfer in relativistic heavy-ion collisions, based upon composite particle multiple scattering theory, is presented. Transverse and longitudinal momentum transfers to the projectile are shown to arise from the real and absorptive part of the optical potential, respectively. Comparisons of fragment momentum distribution observables with experiments are made and trends outlined based on our knowledge of the underlying nucleon-nucleon interaction. Corrections to the above calculations are discussed. Finally, use of the model as a tool for estimating collision impact parameters is indicated.

Khandelwal, Govind S.; Khan, Ferdous

1989-01-01

59

Differential Elastic Proton-Proton, Nucleon-Deuteron and Deuteron-Deuteron Scattering at Big Momentum Transfer.  

National Technical Information Service (NTIS)

Experimental data on pp, ND and DD differential elastic cross sections at big momentum transfer is obtained. Cross sections of elastic pp, ND, DD scattering in the 0.1-0.2 (GeV/c) exp 2 range of momentum transfer at 8.9 GeV/c momentum of primary protons a...

A. M. Baldin V. K. Bondarev A. N. Manyatovskii N. S. Moroz Y. A. Panebrattsev

1979-01-01

60

Effect of Increased Academic Momentum on Transfer Rates: An Application of the Generalized Propensity Score  

ERIC Educational Resources Information Center

Several studies have reported a positive impact of increased academic momentum on transfer from community colleges to four-year institutions. This result may be due to selection bias. Using data from the Beginning Postsecondary Students dataset, I test whether taking more credits in the first year has an impact on transfer rates among bachelor's…

Doyle, William R.

2011-01-01

61

The importance of momentum transfer in collision-induced breakups in low Earth orbit  

NASA Technical Reports Server (NTRS)

Although there is adequate information on larger objects in low Earth orbit, specifically those objects larger than about 10 cm in diameter, there is little direct information on objects from this size down to 1 mm. Yet, this is the sized regime where objects acting as projectiles represent the ability to seriously damage or destroy a functioning spacecraft if they collide with it. The observed consequences of known collisional breakups in orbit indicates no significant momentum transfer in the resulting debris cloud. The position taken in this paper is that this is an observational selection effect: what is seen in these events is an explosion-like breakup of the target structure arising from shock waves introduced into the structure by the collision, but one that occurs significantly after the collision processes are completed; the collision cloud, in which there is momentum transfer, consists of small, unobserved fragments. Preliminary computations of the contribution of one known collisional breakup, Solwind at 500 km in 1985, and Cosmos 1275 in 1981, assume no momentum transfer on breakup and indicate that these two events are the dominant contributors to the current millimeter and centimeter population. A different story would emerge if momentum transfer was taken into account. The topics covered include: (1) observation of on-orbit collisional breakups; (2) a model for momentum transfer; and (3) velocity space representation of breakup clouds.

Reynolds, Robert C.; Lillie, Brian J.

1991-01-01

62

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

63

Energy and angular momentum transfer in binary galaxies  

NASA Technical Reports Server (NTRS)

The authors numerically studied tidal effects of a massive perturber on a satellite galaxy. The model consists of a spherical satellite galaxy and a point mass perturber and the encounter is non-penetrating. A wide range of density ratios and eccentricities of the relative orbits have been considered. The disruption of the satellite galaxy has been observed when the numerical value of the fractional change in the energy is greater than two. The changes in the energy and angular momentum show smooth variation in the case of unbound orbits and irregular variation in the bound orbit cases. It is shown that for a constant pericentral distance, increasing the density ratio decreases the tidal effects; and for a given density ratio an increase in the eccentricity decreases the tidal effects.

Namboodiri, P. M. S.; Kochhar, R. K.

1990-01-01

64

Design and development of an optical scanning mechanism (OSMA) with minimum momentum transfer  

NASA Technical Reports Server (NTRS)

The development model for an optical scanning mechanism assembly is described as being two equal inertial masses which collide with each other to minimize the momentum transfer to the satellite and other mounted instruments. The design criteria for the mirror, the compensating inertia structure and other components are given. The details of the design are discussed and related test results are presented, which show the validity of the design concept for momentum compensation.

Sainz, L. B. F.; Herrera, E.; Bajo, J. M.; Mallard, H. J.

1981-01-01

65

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

66

The Isovector Form Factor of the Proton from at Low Momentum Transfer  

NASA Astrophysics Data System (ADS)

The SAMPLE experiment measures the parity-violating (PV) asymmetry in low momentum transfer backward angle electron scattering from deuterium and hydrogen. Experiments were conducted at the MIT Bates Linear Accelerator Center, where the PV asymmetries in electron-deuteron and electron-proton scattering were measured at a momentum transfer of 0.09 (GeV/c)^2. From these measurements both the strange quark contribution to the nucleon magnetic form factor and the isovector axial form factor of the proton can be determined. An updated analysis of these measurements is in agreement with theoretical predictions of the isovector axial form factor. More recently a measurement of the PV asymmetry in electron-deuteron scattering at a momentum transfer of 0.04 (GeV/c)^2 has been completed. The asymmetry measured in this experiment is also consistent with the theoretical predictions of the isovector axial form factor of the proton.

Hasty, Richard

2004-05-01

67

The relation between momentum transfer and capture and total scattering cross sections for ion-dipole collisions  

NASA Technical Reports Server (NTRS)

Numerical values of momentum transfer cross sections sigma sub m for ion-dipole collisions are compared with the corresponding capture cross sections sigma sub c as a function of ion velocity and rotational temperature. For values of dipole moment mu from 1 to 4 Debyes the sigma sub m/sigma sub c ratio is in the range 1.2 to 2.0 (roughly). This is in contrast to the simple relation for Langevin collisions where sigma sub m/sigma sub c is equal to or approximately 1.10 independent of polarizability of the target atom. At low temperatures, the momentum transfer cross sections can be as large as 2000 A squared but they are only about 15 to 30 percent of the total scattering cross sections sigma sub S.

Dugan, J. V., Jr.

1972-01-01

68

Real Compton Scattering on Proton at High Momentum Transfers  

SciTech Connect

The E99-114 experiment was carried out to measure the cross sections for Real Compton Scattering (RCS) on the proton in the kinematic range s = 5-11 GeV{sup 2}, -t = 2-7 GeV{sup 2}. In addition, a measurement of longitudinal and transverse polarization transfers was made at s = 6.9 GeV{sup 2} and -t = 4.0 GeV{sup 2}. These measurements were done to test the existing theoretical mechanisms for this process and will possibly lead to the determination of RCS form factors which are related to the Generalized Parton Distributions (GPD). The experiment was conducted in Hall A of Thomas Jefferson National Accelerator Facility (Jefferson Lab). Final results of polarization transfer measurements are presented.

A. Danagoulian; D.J. Hamilton; C.E. Hyde-Wright; V.H. Mamyan; A.M. Nathan; M. Roedelbronn; B. Wojtsekhowski

2005-06-01

69

Real Compton Scattering on Proton at High Momentum Transfers  

Microsoft Academic Search

The E99-114 experiment was carried out to measure the cross sections for Real Compton Scattering (RCS) on the proton in the kinematic range s = 5-11 GeV², -t = 2-7 GeV². In addition, a measurement of longitudinal and transverse polarization transfers was made at s = 6.9 GeV² and -t = 4.0 GeV². These measurements were done to test the

A. Danagoulian; D. J. Hamilton; C. E. Hyde-Wright; V. H. Mamyan; A. M. Nathan; M. Roedelbronn; B. Wojtsekhowski

2005-01-01

70

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

71

Further Evidence for Jet Structure in Large Transverse Momentum Reactions from Rapidity Correlations and Associated Multiplicities.  

National Technical Information Service (NTIS)

Using the hard collision model and a simple parametrisation for jet fragmentation expressions for same side and opposite side two-particle correlations and multiplicities associated with large transverse momentum trigger particles are derived. Recent data...

J. Ranft, G. Ranft

1976-01-01

72

Giant plasmonic energy and momentum transfer on the nanoscale  

NASA Astrophysics Data System (ADS)

We have developed a general theory of the plasmonic enhancement of many-body phenomena resulting in a closed expression for the surface plasmon-dressed Coulomb interaction. It is shown that this interaction has a resonant nature. We have also demonstrated that renormalized interaction is a long-ranged interaction whose intensity is considerably increased compared to bare Coulomb interaction over the entire region near the plasmonic nanostructure. We illustrate this theory by re-deriving the mirror charge potential near a metal sphere as well as the quasistatic potential behind the so-called perfect lens at the surface plasmon (SP) frequency. The dressed interaction for an important example of a metal--dielectric nanoshell is also explicitly calculated and analyzed. The renormalization and plasmonic enhancement of the Coulomb interaction is a universal effect, which affects a wide range of many-body phenomena in the vicinity of metal nanostructures: chemical reactions, scattering between charge carriers, exciton formation, Auger recombination, carrier multiplication, etc. We have described the nanoplasmonic-enhanced Forster resonant energy transfer (FRET) between quantum dots near a metal nanoshell. It is shown that this process is very efficient near high-aspect-ratio nanoshells. We have also obtained a general expression for the force exerted by an electromagnetic field on an extended polarizable object. This expression is applicable to a wide range of situations important for nanotechnology. Most importantly, this result is of fundamental importance for processes involving interaction of nanoplasmonic fields with metal electrons. Using the obtained expression for the force, we have described a giant surface-plasmon-induced drag-effect rectification (SPIDER), which exists under conditions of the extreme nanoplasmonic confinement. Under realistic conditions in nanowires, this giant SPIDER generates rectified THz potential differences up to 10V and extremely strong electric fields up to 105--10 6 V/cm. It can serve as a powerful nanoscale source of THz radiation. The giant SPIDER opens up a new field of ultraintense THz nanooptics with wide potential applications in nanotechnology and nanoscience, including microelectronics, nanoplasmonics, and biomedicine. Additionally, the SPIDER is an ultrafast effect whose bandwidth for nanometric wires is 20 THz, which allows for detection of femtosecond pulses on the nanoscale. INDEX WORDS: Nanoplasmonics, Nanoplasmonic renormalization of Coulomb interaction, Surface-plasmon enhanced Forster energy transfer (FRET), Surface-plasmon-induced drag-effect rectification (SPIDER), Nanotechnology, Plasmonics on the nanoscale, Localized surface plasmons (LSPs), Surface plasmon polaritons (SPPs)

Durach, Maxim

73

On the angular momentum transfer on to compact stars in binary systems  

Microsoft Academic Search

Results of three-dimensional numerical simulations of the gas transfer in close binary systems show that, in addition to the formation of a tidally induced spiral shock wave, it is also possible for accretion streams to be produced, having low specific angular momentum in a region close to the accreting star. These streams are mainly placed above the orbital disc but

D. Molteni; O. A. Kuznetsov; D. V. Bisikalo; A. A. Boyarchuk

2001-01-01

74

Heat and Momentum Transfers under Strong Stability in the Atmospheric Surface Layer  

Microsoft Academic Search

Transfers of heat and momentum under strongly stable conditions in the atmospheric boundary layer have been studied through measurements of the turbulent fluctuations and vertical mean profiles of wind velocity and air temperature. As the local gradient Richardson number increases, intermittent turbulence appears, especially in temperature fluctuations. The ratio of the eddy conductivity to the eddy viscosity decreases with increasing

J. Kondo; O. Kanechika; N. Yasuda

1978-01-01

75

Optical Vortices with Large Orbital Momentum: Generation and Interference  

NASA Technical Reports Server (NTRS)

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.

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

2006-01-01

76

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

77

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

78

Energy transfer, orbital angular momentum, and discrete current in a double-ring fiber array  

SciTech Connect

We study energy transfer and orbital angular momentum of supermodes in a double-ring array of evanescently coupled monomode optical fibers. The structure of supermodes and the spectra of their propagation constants are obtained. The geometrical parameters of the array, at which the energy is mostly confined within the layers, are determined. The developed method for finding the supermodes of concentric arrays is generalized for the case of multiring arrays. The orbital angular momentum carried by a supermode of a double-ring array is calculated. The discrete lattice current is introduced. It is shown that the sum of discrete currents over the array is a conserved quantity. The connection of the total discrete current with orbital angular momentum of discrete optical vortices is made.

Alexeyev, C. N.; Volyar, A. V. [Taurida National V.I. Vernadsky University, Vernadsky Prospekt, 4, Simferopol, 95007, Crimea (Ukraine); Yavorsky, M. A. [Taurida National V.I. Vernadsky University, Vernadsky Prospekt, 4, Simferopol, 95007, Crimea (Ukraine); Universite Bordeaux and CNRS, LOMA, UMR 5798, FR-33400 Talence (France)

2011-12-15

79

Momentum transfer interaction of a laser-produced plasma with a low-pressure background.  

NASA Technical Reports Server (NTRS)

The expansion of a laser-produced metallic plasma into a photoionized hydrogen background has been experimentally studied. Langmuir probe and microwave diagnostics have detected an interaction front which decelerates with a dependence on background density and time consistent with a momentum coupling between the laser plasma and the ionized fraction of the background. An ion percursor has also been observed. Calculations of scattering cross sections indicate that multiple-encounter Coulomb scattering will dominate collisional momentum transfer. The leading edge of the laser plasma contains multiply charged ions of charge state z greater than or equal to 5, and collisional effects appear adequate to explain the principal features of the momentum coupling. The ion precursor may have a collisionless origin.

Koopman, D. W.

1972-01-01

80

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

Microsoft Academic Search

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

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

2008-01-01

81

Comparison of Hard Scattering Models for Particle Production at Large Transverse Momentum. 2. Transverse Momentum and Rapidity Dependence of pi exp + and pi exp - Single Particle Distributions.  

National Technical Information Service (NTIS)

Single particle distributions of pi exp + and pi exp - at large transverse momentum are analysed using various hard collision models: qq implies qq, qantiq implies MantiM, qM implies qM. The transverse momentum dependence at thetasub(cm) = 90 exp 0 is wel...

A. Schiller E. M. Ilgenfritz J. Kripfganz H. J. Moehring G. Ranft

1977-01-01

82

Momentum transfer to the target in peripheral collisions of relativistic heavy ions  

NASA Astrophysics Data System (ADS)

The angular correlations between coincident fission fragments emitted in the reactions of 197Au with 5-GeV protons, 1.25-GeV/nucleon 4He, and 0.25-2.10-GeV/nucleon 20Ne were measured. The longitudinal momentum transfer to the target calculated from these correlations increased with increasing mass loss from the target and was inversely proportional to the projectile velocity, independent of projectile mass. These observations are shown to be consistent with simple two-body models of peripheral reactions. NUCLEAR REACTIONS, FISSION Au(p, f), (4He,f), (20Ne,f), Ep,4He=5, GeV, E20Ne=5-42 GeV, measured angular correlations of coincident fragments; deduced momentum transfer to target.

Kaufman, S. B.; Freedman, M. S.; Henderson, D. J.; Steinberg, E. P.; Wilkins, B. D.; Baden, A.; Gutbrod, H. H.; Maier, M. R.; Péter, J.; Ritter, H. G.; Stelzer, H.; Warwick, A. I.; Wieman, H. H.; Weik, F.

1982-12-01

83

2D momentum distribution of electron in transfer ionization of helium atom by fast proton  

NASA Astrophysics Data System (ADS)

2D distribution of momentum components of the ejected electron in the reaction H+ +He ? H+He2++e at 630 keV proton is studied both theoretically and experimentally. This allows to unambiguously identify contributions from the shake-off and binary encounter mechanisms of transfer ionization. It is shown that the results are highly sensitive to the quality of the initial-state wave function.

Schöffler, M. S.; Chuluunbaatar, O.; Popov, Yu V.; Houamer, S.; Titze, J.; Jahnke, T.; Schmidt, L. Ph H.; Jagutzki, O.; Galstyan, A.; Gusev, A. A.

2014-04-01

84

Spin angular momentum transfer from TEM00 focused Gaussian beams to negative refractive index spherical particles  

PubMed Central

We investigate optical torques over absorbent negative refractive index spherical scatterers under the influence of linear and circularly polarized TEM00 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.

Ambrosio, Leonardo A.; Hernandez-Figueroa, Hugo E.

2011-01-01

85

Bounds in proton-proton elastic scattering at low momentum transfer  

Microsoft Academic Search

We present a bound on the imaginary part of the single helicity-flip\\u000aamplitude for spin 1\\/2-spin 1\\/2 scattering at small momentum transfer. The\\u000avariational method of Lagrange multipliers is employed to optimize the\\u000asingle-flip amplitude using the values of the total cross section, the elastic\\u000across section and diffraction slope as equality constraints in addition to the\\u000ainequality constraints resulting

A. T. Bates; N. H. Buttimore

2001-01-01

86

Bounds in proton-proton elastic scattering at low momentum transfer  

Microsoft Academic Search

We present a bound on the imaginary part of the single helicity-flip amplitude for spin 1\\/2-spin 1\\/2 scattering at small momentum transfer. The variational method of Lagrange multipliers is employed to optimize the single-flip amplitude using the values of sigmatot, sigmael and diffraction slope as equality constraints in addition to the inequality constraints resulting from unitarity. Such bounds provide important

A. T. Bates; N. H. Buttimore

2002-01-01

87

Momentum transfer in the one-dimensional impact of spaced plates  

NASA Technical Reports Server (NTRS)

The two-dimensional hydrocode CSQ III was used to calculate the fraction of momentum transferred from a flyer plate to a target of two spaced plates. The effect of the vaporization phase transition, as calculated with the ANEOS analytical complete three-phase equation of state, was estimated. Application of these results to the protection of spacecraft from meteoroids and orbital debris is discussed.

Abbott, R. D.; Bjorkman, Michael D.

1991-01-01

88

Mass and momentum transfer across solid-fluid boundaries in the lattice-Boltzmann method.  

PubMed

Mass conservation and momentum transfer across solid-fluid boundaries have been active topics through the development of the lattice-Boltzmann method. In this paper, we review typical treatments to prevent net mass transfer across solid-fluid boundaries in the lattice-Boltzmann method, and argue that such efforts are in general not necessary and could lead to incorrect results. Carefully designed simulations are conducted to examine the effects of normal boundary movement, tangential density gradient, and lattice grid resolution. Our simulation results show that the global mass conservation can be well satisfied even with local unbalanced mass transfer at boundary nodes, while a local mass conservation constraint can produce incorrect flow and pressure fields. These simulations suggest that local mass conservation, at either a fluid or solid boundary node, is not only an unnecessary consequence to maintain the global mass conservation, but also harmful for meaningful simulation results. In addition, the concern on the momentum addition and reduction associated with status-changing nodes is also not technically necessary. Although including this momentum addition or reduction has no direct influence on flow and pressure fields, the incorrect fluid-particle interaction may affect simulation results of particulate suspensions. PMID:23005876

Yin, Xuewen; Le, Guigao; Zhang, Junfeng

2012-08-01

89

On total turbulent energy and the passive and active role of buoyancy in turbulent momentum and mass transfer  

NASA Astrophysics Data System (ADS)

Measurements of turbulent fluctuations of horizontal and vertical components of velocity, salinity and suspended particulate matter are presented. Turbulent Prandtl numbers are found to increase with stratification and to become larger than 1. Consequently, the vertical turbulent mass transport is suppressed by buoyancy forces, before the turbulent kinetic energy (TKE) and vertical turbulent momentum exchange are inhibited. With increasing stratification, the buoyancy fluxes do not cease, instead they become countergradient. We find that buoyantly driven motions play an active role in the transfer of mass. This is in agreement with trends derived from Monin-Obukhov scaling. For positive Richardson flux numbers (Ri f ), the log velocity profile in the near-bed layer requires correction with a drag reduction. For negative Ri f , the log velocity profile should be corrected with a drag increase, with increasing |Ri f |. This highlights the active role played by buoyancy in momentum transfer and the production of TKE. However, the data do not appear to entirely follow Monin-Obukhov scaling. This is consistent with the notion that the turbulence field is not in equilibrium. The large stratification results in the decay of turbulence and countergradient buoyancy fluxes act to restore equilibrium in the energy budget. This implies that there is a finite adjustment timescale of the turbulence field to changes in velocity shear and density stratification. The energy transfers associated with the source and sink function of the buoyancy flux can be modeled with the concept of total turbulent energy.

de Nijs, Michel A. J.; Pietrzak, Julie D.

2012-06-01

90

Heat and momentum transfer characteristics of adjacent fields of soybeans and maize  

NASA Astrophysics Data System (ADS)

Measurements made as part of studies of the evolution of the planetary boundary layer (the “Sangamon” experiments of 1975 and 1976) are used to compare the surface eddy fluxes of heat and momentum over adjacent fields of soybeans and maize. Although the maize canopy was much taller and rougher than that of the soybeans, daytime eddy fluxes of momentum over the maize exceeded those over the soybeans by only about 35%, in good agreement with predictions based on PBL similarity theory. Heat flux was about 10% greater over the maize, probably as a consequence of greater evaporation over the soybeans. Infrared surface temperatures generally differed by less than 0.4 °C and net radiation by less than 10%. For the soybean canopy, the momentum displacement height was found to be located at approximately 90% of the crop height, and the roughness length was about 5%. The roughness length for sensible heat transfer was found to be 2 3% of the soybean canopy height. For the maize canopy, the momentum displacement height was about 60% of the crop height, and the roughness length about 7%.

Hicks, B. B.; Wesely, M. L.

1981-03-01

91

An investigation of the normal momentum transfer for gases on tungsten  

NASA Technical Reports Server (NTRS)

The near monoenergetic beam of neutral helium and argon atoms impinged on a single crystal tungsten target, with the (100) face exposed to the beam. The target was mounted on a torsion balance. The rotation of this torsion balance was monitored by an optical lever, and this reading was converted to a measurement of the momentum exchange between the beam and the target. The tungsten target was flashed to a temperature in excess of 2000 C before every clean run, and the vacuum levels in the final chamber were typically between 0.5 and 1 ntorr. The momentum exchange for the helium-tungsten surface and the argon-tungsten surface combination was obtained over approximately a decade of incoming energy (for the argon gas) at angles of incidence of 0, 30, and 41 deg on both clean and dirty (gas covered) surfaces. The results exhibited a significant variation in momentum transfer between the data obtained for the clean and dirty surfaces. The values of normal momentum accommodation coefficient for the clean surface were found to be lower than the values previously reported.

Moskal, E. J.

1971-01-01

92

Underlying event in large transverse momentum charged jet and Z-boson production.  

National Technical Information Service (NTIS)

The authors study the behavior of the underlying event in large transverse momentum charged jet and Z-boson production at 1.8 TeV and compare with the QCD Monte-Carlo models. The data indicate that neither ISAJET or HERWIG produce enough charged particles...

R. Field

2000-01-01

93

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

94

Unsteady Analysis of Blade and Tip Heat Transfer as Influenced by the Upstream Momentum and Thermal Wakes  

NASA Technical Reports Server (NTRS)

The effect of the upstream wake on the blade heat transfer has been numerically examined. The geometry and the flow conditions of the first stage turbine blade of GE s E3 engine with a tip clearance equal to 2 percent of the span was utilized. Based on numerical calculations of the vane, a set of wake boundary conditions were approximated, which were subsequently imposed upon the downstream blade. This set consisted of the momentum and thermal wakes as well as the variation in modeled turbulence quantities of turbulence intensity and the length scale. Using a one-blade periodic domain, the distributions of unsteady heat transfer rate on the turbine blade and its tip, as affected by the wake, were determined. Such heat transfer coefficient distribution was computed using the wall heat flux and the adiabatic wall temperature to desensitize the heat transfer coefficient to the wall temperature. For the determination of the wall heat flux and the adiabatic wall temperatures, two sets of computations were required. The results were used in a phase-locked manner to compute the unsteady or steady heat transfer coefficients. It has been found that the unsteady wake has some effect on the distribution of the time averaged heat transfer coefficient on the blade and that this distribution is different from the distribution that is obtainable from a steady computation. This difference was found to be as large as 20 percent of the average heat transfer on the blade surface. On the tip surface, this difference is comparatively smaller and can be as large as four percent of the average.

Ameri, Ali A.; Rigby, David L.; Steinthorsson, Erlendur; Heidmann, James D.; Fabian, John C.

2008-01-01

95

Momentum Transfer to a Free Floating Double Slit: Realization of a Thought Experiment from the Einstein-Bohr Debates  

NASA Astrophysics Data System (ADS)

We simultaneously measured the momentum transferred to a free-floating molecular double slit and the momentum change of the atom scattering from it. Our experimental results are compared to quantum mechanical and semiclassical models. The results reveal that a classical description of the slits, which was used by Einstein in his debate with Bohr, provides a surprisingly good description of the experimental results, even for a microscopic system, if momentum transfer is not ascribed to a specific pathway but shared coherently and simultaneously between both.

Schmidt, L. Ph. H.; Lower, J.; Jahnke, T.; Schößler, S.; Schöffler, M. S.; Menssen, A.; Lévêque, C.; Sisourat, N.; Taïeb, R.; Schmidt-Böcking, H.; Dörner, R.

2013-09-01

96

Linear momentum transfer effects in molecular dissociation produced by electron impact.  

NASA Technical Reports Server (NTRS)

In this study of molecular dissociation produced by electron impact, diatomic systems and polyatomic molecules are considered, and attention is given to the effects of thermal motion and of momentum transfer in the collision process. A procedure is described which makes it possible to 'construct' both the laboratory angular distribution and velocity distribution of the atomic fragments (or, alternatively, the time-of-flight distribution). The calculation assumes that s-wave electron scattering predominates, i.e., that excitation occurs near threshold. The computational procedure may also be reversed to allow construction of possible molecular models to fit given experimental angular and velocity distribution data.

Misakian, M.; Pearl, J. C.; Mumma, M. J.

1972-01-01

97

Prospect for observation of polarization in electron-deuteron elastic scattering at high momentum transfer  

SciTech Connect

A measurement of the charge and quadrupole form factors of the deuteron would address the most fundamental questions in nuclear physics: validity of perturbative QCD at relatively low momentum transfer, effect of isoscalar meson-exchange currents, and the deuteron structure at short range. Polarization methods will be required in order to provide the separation of these form factors. We propose that the high current of electrons in a storage ring be employed in order to scatter electrons from a gaseous, tensor-polarized, deuterium target.

Holt, R.J.; Green, M.C.; Young, L.; Kowalczyk, R.S.; Geesaman, D.F.; Zeidman, B.; Goodman, L.S.; Napolitano, J.

1985-01-01

98

Momentum Transfer Dependence of Inelastic X-Ray Scattering from the Li K Edge  

NASA Astrophysics Data System (ADS)

Inelastic x-ray scattering from the K edge of lithium metal at 30 K is measured at momentum transfers q = 8.8 and 97.3 nm-1 with 80 meV energy resolution. The transition from dipolar ( 1s-->p, q = 8.8 nm-1) to monopolar ( 1s-->s, q = 97.3 nm-1) excitations is demonstrated by differences in the spectra reflecting either the p or s partial density of states above the Li Fermi level. The Mahan-Nozières-De Dominicis theory is utilized to determine both threshold exponents ?0 and ?1 from the present K-edge data.

Krisch, M. H.; Sette, F.; Masciovecchio, C.; Verbeni, R.

1997-04-01

99

Giant TMR effect and spin momentum transfer in MgO-based magnetic tunnel junctions  

NASA Astrophysics Data System (ADS)

First-principle theories predicted an extremely high magnetoresistance (MR) ratio over 1000% in fully epitaxial Fe(001)/MgO(001)/Fe(001) MTJs [1]. This giant tunneling magnetoresistance (TMR) effect originates from a coherent spin-dependent tunneling of highly spin-polarized ?1 electronic states. We have fabricated fully epitaxial Fe1-xCox(001)/MgO(001)/Fe(001) MTJs [2,3] and CoFeB/MgO(001)/CoFeB MTJs [4] and achieved giant MR ratios above 200% at room temperature. A low resistance-area (RA) product indispensable for magnetic sensor application has also been achieved in CoFeB/MgO(001)/CoFeB MTJs [5]. Because of the high spin polarization of tunneling electrons, the MgO-based MTJs have an advantage in spin transfer phenomena, too. Current-induced magnetization reversal due to spin transfer torque has been demonstrated using CoFeB/MgO(001)/CoFeB MTJs [6]. The MTJ was also found to act as a microwave detector [7]. When an ac current with a microwave frequency is applied to the MTJ, a dc offset voltage is generated. This phenomenon, named as spin-torque diode effect, originates from spin momentum transfer, ferromagnetic resonance and the giant TMR effect. The giant TMR effect and spin momentum transfer in MgO-based MTJs are the key for next-generation spintronic devices. References [1] W. H. Butler et al., Phys. Rev. B 63, 054416 (2001). [2] S. Yuasa et al., Nature Mater. 3, 868 (2004). [3] S. Yuasa et al., Appl. Phys. Lett. 87, 222508 (2005). [4] D. D. Djayaprawira et al., Appl. Phys. Lett. 86, 092502 (2005). [5] K. Tsunekawa et al., Appl. Phys. Lett. 87, 072503 (2005). [6] H. Kubota et al., Jpn. J. Appl. Phys. 44, L1237 (2005). [7] A. A. Tulapurkar et al., Nature 438, 339 (2005).

Yuasa, Shinji

2006-03-01

100

Recoil-ion momentum distributions for transfer ionization in fast proton-He collisions  

SciTech Connect

We present high-luminosity experimental investigations of the transfer ionization (TI:p+He{yields}H{sup 0}+He{sup 2+}+e{sup -}) process in collisions between fast protons and neutral helium atoms in the earlier inaccessibly high-energy range 1.4-5.8 MeV. The protons were stored in the heavy-ion storage and cooler ring CRYRING, where they intersected a narrow supersonic helium gas jet. We discuss the longitudinal recoil-ion momentum distribution, as measured by means of cold-target recoil-ion momentum spectroscopy and find that this distribution splits into two completely separated peaks at the high end of our energy range. These separate contributions are discussed in terms of the earlier proposed Thomas TI (TTI) and kinematic TI mechansims. The cross section of the TTI process is found to follow a {sigma}{proportional_to}v{sup -b} dependence with b=10.78{+-}0.27 in accordance with the expected v{sup -11} asymptotic behavior. Further, we discuss the probability for shake-off accompanying electron transfer and the relation of this TI mechanism to photodouble ionization. Finally the influence of the initial-state electron velocity distribution on the TTI process is discussed.

Schmidt, H.T.; Reinhed, P.; Schuch, R.; Zettergren, H.; Cederquist, H. [Department of Physics, Stockholm University, S-10691 Stockholm (Sweden); Jensen, J. [Department of Physics, Stockholm University, S-10691 Stockholm (Sweden); Angstroem Laboratory, Uppsala University, S-75121 Uppsala (Sweden); Stoechkel, K. [Department of Physics, Stockholm University, S-10691 Stockholm (Sweden); Department of Physics, Umeaa University, S-90187 Umeaa (Sweden); Bagge, L.; Danared, H.; Kaellberg, A. [Manne Siegbahn Laboratory, Stockholm University, S-10405 Stockholm (Sweden); Schmidt-Boecking, H. [Institut fuer Kernphysik, Universitaet Frankfurt, DE-60486 (Germany); Cocke, C. L. [Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States)

2005-07-15

101

The neoclassical angular momentum flux in the large aspect ratio limit  

SciTech Connect

The small rotation version of the neoclassical angular momentum flux is calculated in the large aspect ratio limit and in the banana regime. The method relies on solving an adjoint equation to the customary linearized drift kinetic equation, circumventing the difficulty of obtaining the ion distribution function that is second order in the ratio of poloidal gyroradius over plasma scale length. The result differs significantly from a long-standing result for circular cross-section flux surfaces.

Wong, S.K.; Chan, V.S. [General Atomics, P.O. Box 85608, San Diego, California 92186-5688 (United States)

2005-09-15

102

Isolated tau leptons in events with large missing transverse momentum at HERA  

Microsoft Academic Search

A search for events containing isolated tau leptons and large missing transverse momentum, not originating from the tau decay, has been performed with the ZEUS detector at the electron–proton collider HERA, using 130 pb?1 of integrated luminosity. A search was made for isolated tracks coming from hadronic tau decays. Observables based on the internal jet structure were exploited to discriminate between tau

S. Bhadra; C. D. Catterall; S. Fourletov; G. Hartner; S. Magill; M. Soares; J. Standage; J. Repond; R. Yoshida; M. C. K. Mattingly; P. Antonioli; G. Bari; M. Basile; L. Bellagamba; D. Boscherini; A. Bruni; G. Bruni; G. Cara Romeo; L. Cifarelli; F. Cindolo; A. Contin; M. Corradi; S. de Pasquale; P. Giusti; G. Iacobucci; A. Margotti; A. Montanari; R. Nania; F. Palmonari; A. Pesci; G. Sartorelli; A. Zichichi; G. Aghuzumtsyan; D. Bartsch; I. Brock; S. Goers; H. Hartmann; E. Hilger; P. Irrgang; H.-P. Jakob; O. Kind; U. Meyer; E. Paul; J. Rautenberg; R. Renner; A. Stifutkin; J. Tandler; K. C. Voss; M. Wang; A. Weber; D. S. Bailey; N. H. Brook; J. E. Cole; G. P. Heath; T. Namsoo; S. Robins; M. Wing; M. Capua; A. Mastroberardino; M. Schioppa; G. Susinno; J. Y. Kim; Y. K. Kim; J. H. Lee; I. T. Lim; M. Y. Pac; A. Caldwell; M. Helbich; X. Liu; B. Mellado; Y. Ning; S. Paganis; Z. Ren; W. B. Schmidke; F. Sciulli; J. Chwastowski; A. Eskreys; J. Figiel; A. Galas; K. Olkiewicz; P. Stopa; L. Zawiejski; L. Adamczyk; T. Bold; I. Grabowska-Bold; D. Kisielewska; A. M. Kowal; M. Kowal; T. Kowalski; M. Przybycien; L. Suszycki; D. Szuba; J. Szuba; A. Kotanski; W. Slominski; V. Adler; U. Behrens; I. Bloch; K. Borras; V. Chiochia; D. Dannheim; G. Drews; J. Fourletova; U. Fricke; A. Geiser; P. Göttlicher; O. Gutsche; T. Haas; W. Hain; S. Hillert; B. Kahle; U. Kötz; H. Kowalski; G. Kramberger; H. Labes; D. Lelas; H. Lim; B. Löhr; R. Mankel; I.-A. Melzer-Pellmann; C. N. Nguyen; D. Notz; A. E. Nuncio-Quiroz; A. Polini; A. Raval; L. Rurua; U. Schneekloth; U. Stoesslein; G. Wolf; C. Youngman; W. Zeuner; S. Schlenstedt; G. Barbagli; E. Gallo; C. Genta; P. G. Pelfer; A. Bamberger; A. Benen; N. Coppola; M. Bell; P. J. Bussey; A. T. Doyle; J. Ferrando; S. Hanlon; D. H. Saxon; I. O. Skillicorn; I. Gialas; B. Bodmann; T. Carli; U. Holm; K. Klimek; N. Krumnack; E. Lohrmann; M. Milite; H. Salehi; P. Schleper; S. Stonjek; K. Wick; A. Ziegler; C. Collins-Tooth; C. Foudas; R. Goncalo; K. R. Long; A. D. Tapper; P. Cloth; D. Filges; M. Kataoka; K. Nagano; K. Tokushuku; S. Yamada; Y. Yamazaki; A. N. Barakbaev; E. G. Boos; N. S. Pokrovskiy; B. O. Zhautykov; D. Son; K. Piotrzkowski; F. Barreiro; C. Glasman; O. González; L. Labarga; J. del Peso; E. Tassi; J. Terrón; M. Vázquez; M. Zambrana; M. Barbi; F. Corriveau; S. Gliga; J. Lainesse; S. Padhi; D. G. Stairs; R. Walsh; T. Tsurugai; A. Antonov; P. Danilov; B. A. Dolgoshein; D. Gladkov; V. Sosnovtsev; S. Suchkov; R. K. Dementiev; P. F. Ermolov; Yu. A. Golubkov; I. I. Katkov; L. A. Khein; I. A. Korzhavina; V. A. Kuzmin; B. B. Levchenko; O. Yu. Lukina; A. S. Proskuryakov; L. M. Shcheglova; N. N. Vlasov; S. A. Zotkin; S. Grijpink; E. Koffeman; P. Kooijman; E. Maddox; A. Pellegrino; S. Schagen; H. Tiecke; J. J. Velthuis; L. Wiggers; E. de Wolf; N. Brümmer; B. Bylsma; L. S. Durkin; T. Y. Ling; A. M. Cooper-Sarkar; A. Cottrell; R. C. E. Devenish; B. Foster; G. Grzelak; C. Gwenlan; S. Patel; P. B. Straub; R. Walczak; A. Bertolin; R. Brugnera; R. Carlin; F. dal Corso; S. Dusini; A. Garfagnini; S. Limentani; A. Longhin; A. Parenti; M. Posocco; L. Stanco; M. Turcato; E. A. Heaphy; F. Metlica; B. Y. Oh; J. J. Whitmore; Y. Iga; G. D'Agostini; G. Marini; A. Nigro; C. Cormack; J. C. Hart; N. A. McCubbin; C. Heusch; I. H. Park; N. Pavel; H. Abramowicz; A. Gabareen; S. Kananov; A. Kreisel; A. Levy; M. Kuze; T. Fusayasu; S. Kagawa; T. Kohno; T. Tawara; T. Yamashita; R. Hamatsu; T. Hirose; M. Inuzuka; H. Kaji; S. Kitamura; K. Matsuzawa; M. I. Ferrero; V. Monaco; R. Sacchi; A. Solano; M. Arneodo; M. Ruspa; T. Koop; G. M. Levman; J. F. Martin; A. Mirea; J. M. Butterworth; R. Hall-Wilton; T. W. Jones; M. S. Lightwood; M. R. Sutton; C. Targett-Adams; J. Ciborowski; R. Ciesielski; P. Luzniak; R. J. Nowak; J. M. Pawlak; J. Sztuk; T. Tymieniecka; A. Ukleja; J. Ukleja; A. F. Zarnecki; M. Adamus; P. Plucinski; Y. Eisenberg; L. K. Gladilin; D. Hochman; U. Karshon; M. Riveline; D. Kcira; S. Lammers; L. Li; D. D. Reeder; M. Rosin; A. A. Savin; W. H. Smith; A. Deshpande; S. Dhawan; S. Menary

2004-01-01

103

Understanding horizontal Bridgman shelf growth of cadmium telluride and cadmium zinc telluride. I. Heat and momentum transfer  

NASA Astrophysics Data System (ADS)

Heat and momentum transport during the horizontal Bridgman (HB) growth of cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) are investigated using a large-scale numerical model. The model employs the Galerkin finite element method to calculate two-dimensional, quasi-steady thermal and velocity fields in the presence of a free boundary, the solidification interface. Of particular interest in this study is the exploration of the shelf growth morphology during the HB growth of CdTe and CdZnTe. Our calculations clearly show that shelf growth naturally arises from simple heat transfer effects in the low-gradient system studied here. We also demonstrate how the shelf shape can be altered by process modifications. These results lend important insight to the benefits of shelf growth for production of CdTe and CdZnTe.

Edwards, Krisanne; Derby, Jeffrey J.

1997-08-01

104

Higgs Production with Large Transverse Momentum in Hadronic Collisions at Next-to-Leading Order  

NASA Astrophysics Data System (ADS)

Inclusive associated production of a light Higgs boson with one jet in pp collisions is studied in next-to-leading order quantum chromodynamics. Transverse momentum and rapidity distributions of the Higgs boson are calculated for the LHC in the large top-quark mass limit. We find that the K-factor of this process is large \\(~1.6\\). Our result supports previous suggestions that the production channel p+p-->H+jet -->?+?+jet gives a measurable signal for Higgs production at the LHC in the mass range 100-140 GeV.

de Florian, D.; Grazzini, M.; Kunszt, Z.

1999-06-01

105

Tracing sunspot groups to determine angular momentum transfer on the Sun  

NASA Astrophysics Data System (ADS)

In this paper, our goal is to investigate Reynolds stress and to check whether it is plausible that this is responsible for angular momentum transfer towards the solar equator. We have also analysed meridional velocity, rotation velocity residuals and correlation between the velocities. We have used the position measurements of sunspot groups from the Greenwich Photographic Result and the Solar Observing Optical Network/United States Air Force/National Oceanic and Atmospheric Administration data bases, covering the period 1878-2011. In order to calculate the velocities, we used the daily motion of sunspot groups. The sample was also limited to ±58° in the central meridian distance in order to avoid solar limb effects. We have mainly investigated velocity patterns depending on the solar cycle phase and latitude. We have found that the meridional motion of sunspot groups is towards the centre of activity from all available latitudes and in all phases of the solar cycle. The range of meridional velocities is ±10 m s-1. Horizontal Reynolds stress is negative at all available latitudes and indicates that there is a minimum value (q ? -3000 m2 s-2) located at b ? ±30°. In our convention, this means that angular momentum is transported towards the solar equator, in agreement with the observed rotational profile of the Sun.

Sudar, D.; Skoki?, I.; Ruždjak, D.; Brajša, R.; Wöhl, H.

2014-04-01

106

Intermolecular momentum transfer in poly(perfluorosulfonic acid) membrane hydrated by aqueous solution of methanol: A molecular dynamics simulation study  

NASA Astrophysics Data System (ADS)

Intermolecular momentum transfer in methanol-water mixture solvated poly(perfluoro-sulfonic acid) membrane is studied in terms of center of mass velocity cross-correlation functions between molecular mass centers in their first coordination shells based on molecular dynamics simulations. Moreover, the center of mass velocity cross-correlation functions are also decomposed into longitudinal and transversal contributions. The fastest momentum transfer is observed between hydronium cation and water molecule due to the strong hydrogen bond interaction. The center of mass velocity cross-correlation functions reach peak value in about 36 fs, corresponding to a single collision with a neighboring molecule. For the momentum transfer between the water molecule and methanol molecule, the peaking time is 70 fs or about twice of that between hydronium cation and water molecule. Oscillation of the center of mass velocity cross-correlation functions between hydronium cation and water molecule is also observed due to the cage effect in their equilibrium positions.

Shao, Changle; Yan, Liuming; Ji, Xiaobo; Zhu, Suhua

2009-12-01

107

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

108

Investigation of neutron-deuteron charge-exchange reaction at small transfer momentum  

SciTech Connect

Analysis of the nd {sup {yields}} p(nn) reaction in the GeV energy region is performed in the framework based on the multiple-scattering theory for a few-nucleon system. The special kinematic condition where momentum transfer from neutron beam to final proton is close to zero is considered. The possibility of extracting the spin-dependent term of the elementary np {sup {yields}} pn amplitude from the nd breakup process is investigated. The energy dependence of the ratio R = {sigma}(R = frac d{sigma}{sub nd}) d {omega} and frac d{sigma}{sub np}) d{omega}) is obtained taking account of the final state interaction of the two outgoing neutrons in the {sup 1}S{sub 0} state.

Ladygina, N. B. [Joint Institute for Nuclear Research (Russian Federation)], E-mail: ladygina@sunhe.jinr.ru

2008-01-15

109

Thruster momentum transfer studies and magnetoplasmadynamic (MPD) thruster use in materials/surface modification  

NASA Technical Reports Server (NTRS)

This research project involves the systematic study of the MPD thruster for dual uses. Though it was designed as a thruster for space vehicles, the characteristics of the plasma make it an excellent candidate for industrial applications. This project will seek to characterize the system for use in materials processing and characterization. Crystals grown at Fisk University for use with solid state detectors will be studied. Surface modification on ZnCdTe, CdTe, and ZnTe will be studied using AFM, XPS and SAES. In addition to the surface modification studies, design work on a momentum transfer measurement device has been completed. The design and limitations of the device will be presented.

Thompson, E.; Collins, W. E.; Burger, A.; George, M. A.; Conner, J. D.

1995-01-01

110

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

111

Coherent Control of Angular Momentum Transfer in Resonant Two-Photon Light-Matter Interaction  

NASA Astrophysics Data System (ADS)

We show experimentally and theoretically that a polarization-shaped femtosecond laser pulse with a zero net angular momentum creates a net angular momentum in atomic rubidium during resonant two-photon excitation. The necessary conditions for the creation of a nonzero angular momentum as well as the excitation efficiencies are analyzed in the framework of second-order time-dependent perturbation theory.

Malik, D. A.; Kimel, A. V.; Kirilyuk, A.; Rasing, Th.; van der Zande, W. J.

2010-04-01

112

Measurement of momentum transfer due to adhesive forces: on-ground testing of in-space body injection into geodesic motion.  

PubMed

In the frame of many scientific space missions, a massive free-falling object is required to mark a geodesic trajectory, i.e., to follow inside a spacecraft an orbit that is determined only by the planetary gravity field. The achievement of high-purity geodesic trajectories sets tight design constraints on the reference sensor that hosts and controls the reference body. Among these, a mechanism may be required to cage the reference body during the spacecraft launch and to inject it into the geodesic trajectory once on-orbit. The separation of the body from the injection mechanism must be realized against the action of adhesion forces, and in the worst case this is performed dynamically, relying on the body's inertia through a quick retraction of the holding finger(s). Unfortunately, this manoeuvre may not avoid transferring some momentum to the body, which may affect or even jeopardize the subsequent spacecraft control if the residual velocity is too large. The transferred momentum measurement facility (TMMF) was developed to reproduce representative conditions of the in-flight dynamic injection and to measure the transferred momentum to the released test mass. In this paper, we describe the design and development of the TMMF together with the achieved measurement performance. PMID:22225249

Bortoluzzi, D; Benedetti, M; Baglivo, L; De Cecco, M; Vitale, S

2011-12-01

113

Measurement of momentum transfer due to adhesive forces: On-ground testing of in-space body injection into geodesic motion  

NASA Astrophysics Data System (ADS)

In the frame of many scientific space missions, a massive free-falling object is required to mark a geodesic trajectory, i.e., to follow inside a spacecraft an orbit that is determined only by the planetary gravity field. The achievement of high-purity geodesic trajectories sets tight design constraints on the reference sensor that hosts and controls the reference body. Among these, a mechanism may be required to cage the reference body during the spacecraft launch and to inject it into the geodesic trajectory once on-orbit. The separation of the body from the injection mechanism must be realized against the action of adhesion forces, and in the worst case this is performed dynamically, relying on the body's inertia through a quick retraction of the holding finger(s). Unfortunately, this manoeuvre may not avoid transferring some momentum to the body, which may affect or even jeopardize the subsequent spacecraft control if the residual velocity is too large. The transferred momentum measurement facility (TMMF) was developed to reproduce representative conditions of the in-flight dynamic injection and to measure the transferred momentum to the released test mass. In this paper, we describe the design and development of the TMMF together with the achieved measurement performance.

Bortoluzzi, D.; Benedetti, M.; Baglivo, L.; de Cecco, M.; Vitale, S.

2011-12-01

114

Simultaneous Heat and Momentum Transfer in Two-Phase Systems at Low Pressure and High Temperature: Vapor Phase  

Microsoft Academic Search

The heat and momentum transfer in a liquid-vapor two-phase film system at high temperature and low pressure is studied by the example of the removal of highly volatile fractions from high-boiling liquids in film evaporators. The temperature and velocity distributions in the vapor phase are determined.

V. N. Babak

2005-01-01

115

Cfd Modeling of Iter Cable-In Superconductors. Part v: Combined Momentum and Heat Transfer in Rib Roughened Pipes  

Microsoft Academic Search

Computational Fluid Dynamics (CFD) techniques have been proposed and applied in a series of papers to analyze cable-in-conduit conductors (CICC) for the International Thermonuclear Experimental Reactor (ITER). Previous work on the pressure drop in the central channel of ITER CICC is extended here to the problem of combined heat and momentum transfer. The CFD model, solved by the FLUENT commercial

R. Zanino; S. Giors

2008-01-01

116

Simulation of momentum transfer by vegetation using 3-D non-hydrostatic meso-scale Model  

NASA Astrophysics Data System (ADS)

A 3-D non-hydrostatic meso-scale model is applied to the simulation of wind and turbulence in a plant canopy with a focus on the estimation of vegetation roughness length (z0) and displace height (d). Model vegetation is characterized according to vegetation type by using leaf area density, vegetation height, and leaf area index. The model predicts 3-D wind circulation and turbulence structure within and above the canopy from which z0 and d are estimated. Sensitivity of z0 and d to the canopy architecture and the unknowns in the model parameters controlling momentum transfer by vegetation are examined. For the purpose, the model is first applied to the simulation of wind fields in the spatially homogeneous canopy for which field measurements are available from the literature. Contributions of other forcing terms to wind profile in canopy, which are not considered in the 1-D models are examined. Next, the model is applied to spatially heterogeneous forest in Germany using high-resolution vegetation data. Sensitivity of the predicted z0 and d to the spatial resolution of vegetation is examined. The results can be used to improve the parameterization of z0 and d for regional- and global-scale atmospheric models in which small-scale canopy architecture is not resolved.

Jung, E.; Shao, Y.

2009-09-01

117

Experimental investigation of the triple differential cross section for electron impact ionization of N2 and CO2 molecules at intermediate impact energy and large ion recoil momentum  

NASA Astrophysics Data System (ADS)

The (e,2e) triple differential cross sections (TDCS) are measured for the ionization of nitrogen and carbon dioxide molecules in a coplanar asymmetric geometry for a wide range of ejected electron energies and at an incident energy about 500-700 eV. This kinematics corresponds to a large momentum imparted to the ion, and is meant to enhance the recoil scattering. The experimental binary and recoil angular distributions of the TDCS are characterized both by a shift towards larger angles with respect to the momentum transfer direction and by a large intensity in the recoil region, in particular for the ionization of the 'inner' N2(2?g) molecular orbital. The data are compared with the results of calculations using the first Born approximation-two centre continuum (FBA-TCC) theoretical model for treating differential electron impact ionization. The experimentally observed shifts and recoil intensity enhancement are not predicted by the model calculations, which rather yield a TDCS symmetrically distributed around the momentum transfer direction, and completely fail in describing the recoil distribution. It is hoped that these new results will stimulate the development of more refined theories for correctly modelling single ionization of molecules.

Lahmam-Bennani, A.; Staicu Casagrande, E. M.; Naja, A.

2009-12-01

118

Coherent control of angular momentum transfer in resonant two-photon light-matter interaction.  

PubMed

We show experimentally and theoretically that a polarization-shaped femtosecond laser pulse with a zero net angular momentum creates a net angular momentum in atomic rubidium during resonant two-photon excitation. The necessary conditions for the creation of a nonzero angular momentum as well as the excitation efficiencies are analyzed in the framework of second-order time-dependent perturbation theory. PMID:20481880

Malik, D A; Kimel, A V; Kirilyuk, A; Rasing, Th; van der Zande, W J

2010-04-01

119

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

NASA Astrophysics Data System (ADS)

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 [1]. 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 [2, 3]. 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.

2011-12-01

120

Increased heat transfer to elliptical leading edges due to spanwise variations in the freestream momentum: Numerical and experimental results  

NASA Technical Reports Server (NTRS)

A study of the effect of spanwise variation in momentum on leading edge heat transfer is discussed. Numerical and experimental results are presented for both a circular leading edge and a 3:1 elliptical leading edge. Reynolds numbers in the range of 10,000 to 240,000 based on leading edge diameter are investigated. The surface of the body is held at a constant uniform temperature. Numerical and experimental results with and without spanwise variations are presented. Direct comparison of the two-dimensional results, that is, with no spanwise variations, to the analytical results of Frossling is very good. The numerical calculation, which uses the PARC3D code, solves the three-dimensional Navier-Stokes equations, assuming steady laminar flow on the leading edge region. Experimentally, increases in the spanwise-averaged heat transfer coefficient as high as 50 percent above the two-dimensional value were observed. Numerically, the heat transfer coefficient was seen to increase by as much as 25 percent. In general, under the same flow conditions, the circular leading edge produced a higher heat transfer rate than the elliptical leading edge. As a percentage of the respective two-dimensional values, the circular and elliptical leading edges showed similar sensitivity to span wise variations in momentum. By equating the root mean square of the amplitude of the spanwise variation in momentum to the turbulence intensity, a qualitative comparison between the present work and turbulent results was possible. It is shown that increases in leading edge heat transfer due to spanwise variations in freestream momentum are comparable to those due to freestream turbulence.

Rigby, D. L.; Vanfossen, G. J.

1992-01-01

121

Imbalance of energy and momentum source terms of the sea wave transfer equation for fully developed seas  

NASA Astrophysics Data System (ADS)

In the concept of full development, the sea wave spectrum is regarded as a nearly stationary solution of the wave transfer equation, where source and sink terms should be in balance with respect to both energy and momentum. Using a two-dimensional empirical sea wave spectral model at full development, this paper performs an assessment of the compatibility of the energy and momentum budgets of sea waves over the whole spectral range. Among the various combinations of model functions for wave breaking and wind source terms tested, not one is found to fulfill simultaneously the energy and momentum balance of the transfer equation. Based on experimental and theoretical grounds, wave breaking is known to contribute to frequency downshift of a narrow-banded wave spectrum when the modulational instability is combined with wave breaking. On those grounds, it is assumed that, in addition to dissipation, wave breaking produces a spectral energy flux directed toward low wavenumbers. I show that it is then possible to remove the energy and momentum budget inconsistency, and correspondingly the required strength of this spectral flux is estimated. Introducing such a downward spectral flux permits fulfilling both energy and momentum balance conditions. Meanwhile, the consistency between the transfer equation and empirical spectra, estimated by means of a cost function K, is either improved or slightly reduced, depending upon the wave breaking and wind source terms chosen. Other tests are performed in which it is further assumed that wave breaking would also be associated with azimuthal diffusion of the spectral energy. This would correspondingly reduce the required downward spectral flux by a factor of up to 5, although it would not be able to remove it entirely.

Caudal, G. V.

2012-12-01

122

Midday auroral breakup events and related energy and momentum transfer from the magnetosheath  

SciTech Connect

Combined observations by meridian-scanning photometers, all-sky auroral TV camera and the EISCAT radar permitted a detailed analysis of the temporal and spatial development of the midday auroral breakup phenomenon and the related ionospheric ion flow pattern within the 71{degree} - 75{degree} invariant latitude radar field of view. The radar data revealed dominating northward and westward ion drifts, of magnitudes close to the corresponding velocities of the discrete, transient auroral forms, during the two different events reported here. The spatial scales of the discrete optical events were {approximately}50 km in latitude by {approximately}500 km in longitude, and their lifetimes were less than 10 min. Electric potential enhancements with peak values in the 30-50 kV range are inferred along the discrete arc in the IMF {vert bar}B{sub y}/B{sub z}{vert bar} {lt} 1 case from the optical data and across the latitudinal extent of the radar field of view in the {vert bar}B{sub y}/B{sub z}{vert bar} {gt} 2 case. Joule heat dissipation rates in the maximum phase of the discrete structures of {approximately} 100 ergs cm{sup {minus}2} s{sup {minus}1} (0.1 W m{sup {minus}2}) are estimated from the photometer intensities and the ion drift data. These observations combined with the additional characteristics of the events, documented here and in several recent studies are considered to be stong evidence in favour of a transient, intermittent reconnection process at the dayside magnetopause and associated energy and momentum transfer to the ionosphere in the polar cusp and cleft regions.

Sandholt, P.E.; Lybekk, B.; Egeland, A. (Univ. of Oslo (Norway)); Lockwood, M.; Freeman, K.S.; Willis, D.M. (Rutherford Appleton Lab., Chilton (England)); Oguti, T. (Geophysics Research Lab., Tokyo (Japan)); Cowley, S.W.H. (Imperial College, London (England))

1990-02-01

123

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

124

Differential, integral, and momentum-transfer cross sections for elastic electron scattering by neon - 5 to 100 eV  

NASA Technical Reports Server (NTRS)

Relative elastic-scattering differential cross sections were measured in the 5-100-eV impact energy and 10-145 deg angular ranges. Normalization of these cross sections was achieved by utilizing accurate total electron-scattering cross sections. A phase-shift analysis of the angular distributions in terms of real phase shifts has been carried out. From the differential cross sections, momentum-transfer cross sections were obtained and the values of the critical energy and angle were established (associated with the lowest value of the differential cross section) as 62.5 + or - 2.5 eV and 101.7 deg + or - 1.5 deg, respectively. The present phase shifts, the critical parameters, and differential, integral, and momentum-transfer cross sections are compared to previous experimental and theoretical results. The error associated with the present data is about 10 percent.

Register, D. F.; Trajmar, S.

1984-01-01

125

The proton elastic form factor ratio µpG p E\\/G p M at low momentum transfer  

Microsoft Academic Search

High-precision measurements of the proton elastic form factor ratio, µpG 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 si gnificant differences from the central values of several recent phenomenological fits. By combining the ne

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; Seonho Choi; E. Chudakov; L. Coman; B. Craver; F. Cusanno; J. Dumas; C. Dutta; R. Feuerbach; A. Freyberger; S. Frullani; F. Garibaldi; R. Gilman; D. W. Higinbotham; T. Holmstrom; C. E. Hyde; H. Ibrahim; Y. Ilieva; C. W. de Jager; H. Kang; A. Kelleher; E. Kuchina; G. Kumbartzki; J. J. LeRose; R. Lindgren; P. Markowitz; S. May-Tal Beck; E. McCullough; D. Meekins; M. Meziane; E. Meziani; R. Michaels; B. Moffit; B. E. Norum; M. Olson; M. Paolone; K. Paschke; C. F. Perdrisat; E. Piasetzky; M. Potokar; R. Pomatsalyuk; I. Pomerantz; A. Puckett; V. Punjabi; Y. Qiang; R. Ransome; M. Reyhan; J. Roche; Y. Rousseau; A. J. Sarty; B. Sawatzky; E. Schulte; M. Shabestari; A. Shahinyan; R. Shneor; 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

126

Measurements of the Proton Elastic-Form-Factor Ratio mupGEp\\/GMp at Low Momentum Transfer  

Microsoft Academic Search

High-precision measurements of the proton elastic form-factor ratio, mupGEp\\/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,

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; H. Kang; 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

2007-01-01

127

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

NASA Astrophysics Data System (ADS)

Doppler shift and Doppler broadening of prompt ? 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 information regarding reaction mechanisms can be obtained by this technique.

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

2001-09-01

128

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

129

Momentum and buoyancy transfer in atmospheric turbulent boundary layer over wavy water surface - Part 1: Harmonic wave  

NASA Astrophysics Data System (ADS)

The surface-drag and mass-transfer coefficients are determined within a self-consistent problem of wave-induced perturbations and mean fields of velocity and density in the air, using a quasi-linear model based on the Reynolds equations with down-gradient turbulence closure. Investigation of a harmonic wave propagating along the wind has disclosed that the surface drag is generally larger for shorter waves. This effect is more pronounced in the unstable and neutral stratification. The stable stratification suppresses turbulence, which leads to weakening of the momentum and mass transfer.

Troitskaya, Yu. I.; Ezhova, E. V.; Zilitinkevich, S. S.

2013-10-01

130

Energetic particle emission and linear momentum transfer in central collisions induced by 32. 5 MeV/nucleon /sup 16/O + /sup 238/U, /sup 197/Au  

SciTech Connect

Reaction kinetics of incomplete fusion reactions between heavy nuclei of Oxygen and Uranium and Oxygen and Gold are studied at 32.5 MeV bombarding energy to gain information about linear momentum transfer. It is found that the most probable linear momentum transfer is only about 75% of the beam momentum for these reactions. Binary massive transfer mechanisms and prompt nucleon emission are offered as explanations of this phenomena. It appears that nuclear mean field dynamics rather than nucleon-nucleon phenomenon dominate reaction kinetics at this bombarding energy. 5 refs., 8 figs.

Chan, Y.; Chavez, E.; Dacal, A.; Gazes, S.B.; Harmon, A.; Ortiz, M.E.; Plagnol, E.; Pouliot, J.; Stokstad, R.G.

1987-05-01

131

Laser cooling of stored relativistic ion beams with large momentum spreads using a laser system with a wide scanning range  

NASA Astrophysics Data System (ADS)

New results on laser cooling of stored, bunched, relativistic ion beams are presented. For the first time it has been possible to cool an ion beam with large momentum spread without initial electron cooling or scanning of the bunching frequency by using a single cw laser system.

Wen, Weiqiang; Winters, Danyal; Beck, Tobias; Rein, Benjamin; Walther, Thomas; Tichelmann, Sascha; Birkl, Gerhard; Sanchez-Alarcon, Rodolfo; Ullmann, Johannes; Lochmann, Matthias; Nörtershäuser, Wilfried; Clark, Colin; Kozhuharov, Christopher; Kühl, Thomas; Sanjari, Shahab; Litvinov, Yuri; Giacomini, Tino; Steck, Markus; Dimopoulou, Christina; Nolden, Fritz; Stöhlker, Thomas; Yang, Jie; Zhang, Dacheng; Ma, Xinwen; Seltmann, Michael; Siebold, Matthias; Schramm, Ulrich; Bussmann, Michael

2014-04-01

132

Momentum imbalance of D mesons in ultrarelativistic heavy-ion collisions at the CERN Large Hadron Collider  

NASA Astrophysics Data System (ADS)

As a new observable for heavy flavor correlations the momentum imbalance AD of D mesons is proposed. It is defined analogously to the jet momentum imbalance AJ of fully reconstructed jets. However, because D mesons are flavor-tagged particles, no jet reconstruction is necessary. AD quantifies the influence of the medium created in heavy-ion collisions on correlated charm pairs. We present results with the partonic transport model Boltzmann approach to multiparton scatterings, which describes well the nuclear modification factor and elliptic flow of all heavy flavor particles at BNL Relativistic Heavy Ion Collider and Large Hadron Collider (LHC). The AD distribution in heavy-ion collisions at LHC is shifted to larger values of AD compared to proton-proton collisions. We argue that this shift is attributable to medium effects and can be explained partially by a path-length imbalance of charm pairs and partially by momentum fluctuations in the initial charm-pair distribution.

Uphoff, Jan; Senzel, Florian; Xu, Zhe; Greiner, Carsten

2014-06-01

133

Theory for solvent, momentum, and energy transfer between a surfactant solution and a vapor atmosphere.  

PubMed

We develop a complete set of equations governing the evolution of a sharp interface separating a volatile-solvent/nonvolatile-surfactant solution from a vapor atmosphere. In addition to a sorption isotherm equation and the conventional balances for mass, linear momentum, and energy, these equations include an alternative to the Hertz-Knudsen-Langmuir equation familiar from conventional theories of evaporation and condensation. This additional equation arises from a consideration of configurational forces within a thermodynamical framework. While the notion of configurational forces is well developed and understood for the description of materials that, like crystalline solids, possess natural reference configurations, very little has been done regarding their role in materials, such as viscous fluids, that do not possess preferred reference states. We therefore provide comprehensive developments of configurational forces, the balance of configurational momentum, and configurational thermodynamics. Our treatment does not require a choice of reference configuration. The general evolution equations arising from our theory account for the thermodynamic structure of the solution and the interface and for sources of dissipation related to the transport of surfactant, momentum, and heat in the solution and within the interface along with the transport of solute, momentum, kinetic energy, and heat across the interface. Moreover, the equations account for the Soret and Dufour effects in the solution and on the interface and for observed discontinuities of the temperature and chemical potential across the interface. Due to the complexity of these equations, we provide approximate equations which we compare to equations preexistent in the literature. PMID:16906840

Fried, Eliot; Shen, Amy Q; Gurtin, Morton E

2006-06-01

134

Comparison of the {sup 12}C(e,e{sup '}p) cross section at low momentum transfer with a relativistic calculation  

SciTech Connect

The (e,e{sup '}p{sub 0}) cross section of {sup 12}C has been measured at an energy transfer of 60 MeV and a momentum transfer of 104.4 MeV/c using a 197.5 MeV continuous electron beam. The cross section at missing momenta between 181.5 and 304.8 MeV/c obtained from the experiment is compared with theoretical calculations based on the relativistic distorted-wave impulse approximation with and without meson-exchange currents (MEC). The contribution of MEC due to the seagull current is large in the high-missing-momentum region, in particular for the longitudinal component. The cross sections calculated using three different current-conserving operators (cc1, cc2, and cc3) are similar, in contrast to the ({gamma},p) reaction, where the operators give very different results. The shape of the measured cross section is well described by the calculations, whereas its magnitude is slightly smaller than that described by the calculations.

Tamae, T.; Sato, Y.; Yokokawa, T.; Asano, Y.; Kawabata, M.; Konno, O.; Nakagawa, I.; Nishikawa, I.; Hirota, K.; Yamazaki, H.; Kimura, R.; Miyase, H.; Tsubota, H.; Giusti, C.; Meucci, A. [Laboratory of Nuclear Science, Graduate School of Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982-0826 (Japan); Department of Physics, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578 (Japan); Dipartimento di Fisica Nucleare e Teorica, Universita di Pavia and Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100 Pavia (Italy)

2009-12-15

135

Application of Momentum Transfer Theory for Ion and Electron Transport in Pure Gases and in Gas Mixtures  

SciTech Connect

In this paper we have presented two applications of Momentum Transfer Theory (MTT), which were both aimed at obtaining reliable data for modeling of non-equilibrium plasma. Transport properties of ion swarms in presence of Resonant Charge Transfer (RCT) collisions are studied using Momentum Transfer Theory (MTT). Using the developed MTT we tested a previously available anisotropic set of cross-sections for Ar++Ar collisions bay making the comparisons with the available data for the transverse diffusion coefficient. We also developed an anisotropic set of Ne++Ne integral cross-sections based on the available data for mobility, longitudinal and transverse diffusion. Anisotropic sets of cross-sections are needed for Monte Carlo simulations of ion transport and plasma models. Application of Blanc's Law for drift velocities of electrons and ions in gas mixtures at arbitrary reduced electric field strengths E/n0 was studied theoretically and by numerical examples. Corrections for Blanc's Law that include effects of inelastic collisions were derived. In addition we have derived the common mean energy procedure that was proposed by Chiflikian in a general case both for ions and electrons. Both corrected common E/n0 and common mean energy procedures provide excellent results even for electrons at moderate E/n0 where application of Blanc's Law was regarded as impossible. In mixtures of two gases that have negative differential conductivity (NDC) even when neither of the two pure gases show NDC the Blanc's Law procedure was able to give excellent predictions.

Jovanovic, J.V. [Institute of Physics, P.O.Box 68, 11080 Zemun, Belgrade (Serbia and Montenegro); Faculty of Mechanical Engineering, 11000 Belgrade (Serbia and Montenegro); Vrhovac, S. B. [Institute of Physics, P.O.Box 68, 11080 Zemun, Belgrade (Serbia and Montenegro)

2004-12-01

136

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

137

Understanding horizontal Bridgman shelf growth of cadmium telluride and cadmium zinc telluride. I. Heat and momentum transfer  

Microsoft Academic Search

Heat and momentum transport during the horizontal Bridgman (HB) growth of cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) are investigated using a large-scale numerical model. The model employs the Galerkin finite element method to calculate two-dimensional, quasi-steady thermal and velocity fields in the presence of a free boundary, the solidification interface. Of particular interest in this study is the

Krisanne Edwards; Jeffrey J. Derby

1997-01-01

138

Orbital angular momentum (OAM) multiplexing in free-space optical data transfer  

Microsoft Academic Search

In the optical wireless communication systems proposed by Gibson, et al, the information is encoded as states of orbital angular momentum (OAM) of light and the transmitter unit can produce laser beam with single OAM-state in a time-slot. Recently we have proved that it is possible to generate multiple OAM-states simultaneously by single spatial light modulator. This method is adopted

Jiao Lin; Xiao-Cong Yuan; Shaohua Tao

2006-01-01

139

Cfd Modeling of Iter Cable-In Superconductors. Part v: Combined Momentum and Heat Transfer in Rib Roughened Pipes  

NASA Astrophysics Data System (ADS)

Computational Fluid Dynamics (CFD) techniques have been proposed and applied in a series of papers to analyze cable-in-conduit conductors (CICC) for the International Thermonuclear Experimental Reactor (ITER). Previous work on the pressure drop in the central channel of ITER CICC is extended here to the problem of combined heat and momentum transfer. The CFD model, solved by the FLUENT commercial code, is first validated against 2D and 3D data from compact heat exchangers, showing good agreement. The Colburn analogy between the friction factor f and the Nusselt number Nu is not verified in the considered 2D geometries, as shown by both experiment and simulation. The validated CFD model is finally applied to the 3D analysis of central channel-like geometries relevant for ITER CICC. It is shown that the heat transfer coefficient on the central channel side stays relatively close to the smooth-pipe (Dittus-Boelter) value.

Zanino, R.; Giors, S.

2008-03-01

140

CFD MODELING OF ITER CABLE-IN-CONDUIT SUPERCONDUCTORS. PART V: COMBINED MOMENTUM AND HEAT TRANSFER IN RIB ROUGHENED PIPES  

SciTech Connect

Computational Fluid Dynamics (CFD) techniques have been proposed and applied in a series of papers to analyze cable-in-conduit conductors (CICC) for the International Thermonuclear Experimental Reactor (ITER). Previous work on the pressure drop in the central channel of ITER CICC is extended here to the problem of combined heat and momentum transfer. The CFD model, solved by the FLUENT commercial code, is first validated against 2D and 3D data from compact heat exchangers, showing good agreement. The Colburn analogy between the friction factor f and the Nusselt number Nu is not verified in the considered 2D geometries, as shown by both experiment and simulation. The validated CFD model is finally applied to the 3D analysis of central channel-like geometries relevant for ITER CICC. It is shown that the heat transfer coefficient on the central channel side stays relatively close to the smooth-pipe (Dittus-Boelter) value.

Zanino, R.; Giors, S. [Dipartimento di Energetica, Politecnico Torino, I-10129 (Italy)

2008-03-16

141

Bacterial transfer of large functional genomic DNA into human cells.  

PubMed

Efficient transfer of chromosome-based vectors into mammalian cells is difficult, mostly due to their large size. Using a genetically engineered invasive Escherichia coli vector, alpha satellite DNA cloned in P1-based artificial chromosome was stably delivered into the HT1080 cell line and efficiently generated human artificial chromosomes de novo. Similarly, a large genomic cystic fibrosis transmembrane conductance regulator (CFTR) construct of 160 kb containing a portion of the CFTR gene was stably propagated in the bacterial vector and transferred into HT1080 cells where it was transcribed, and correctly spliced, indicating transfer of an intact and functional locus of at least 80 kb. These results demonstrate that bacteria allow the cloning, propagation and transfer of large intact and functional genomic DNA fragments and their subsequent direct delivery into cells for functional analysis. Such an approach opens new perspectives for gene therapy. PMID:15973438

Laner, A; Goussard, S; Ramalho, A S; Schwarz, T; Amaral, M D; Courvalin, P; Schindelhauer, D; Grillot-Courvalin, C

2005-11-01

142

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

143

Becoming angular momentum density flow through nonlinear mass transfer into a gravitating spheroidal body  

NASA Astrophysics Data System (ADS)

A statistical theory for a cosmological body forming based on the spheroidal body model has been proposed in the works [1]-[4]. This work studies a slowly evolving process of gravitational condensation of a spheroidal body from an infinitely distributed gas-dust substance in space. The equation for an initial evolution of mass density function of a gas-dust cloud is considered here. It is found this equation coincides completely with the analogous equation for a slowly gravitational compressed spheroidal body [5]. A conductive flow in dissipative systems was investigated by I. Prigogine in his works (see, for example, [6], [7]). As it has been found in [2], [5], there exists a conductive antidiffusion flow in a slowly compressible gravitating spheroidal body. Applying the equation of continuity to this conductive flow density we obtain a linear antidiffusion equation [5]. However, if an intensity of conductive flow density increases sharply then the linear antidiffusion equation becomes a nonlinear one. Really, it was pointed to [6] analogous linear equations of diffusion or thermal conductivity transform in nonlinear equations respectively. In this case, the equation of continuity describes a nonlinear mass flow being a source of instabilities into a gravitating spheroidal body because the gravitational compression factor G is a function of not only time but a mass density. Using integral substitution we can reduce a nonlinear antidiffusion equation to the linear antidiffusion equation relative to a new function. If the factor G can be considered as a specific angular momentum then the new function is an angular momentum density. Thus, a nonlinear momentum density flow induces a flow of angular momentum density because streamlines of moving continuous substance come close into a gravitating spheroidal body. Really, the streamline approach leads to more tight interactions of "liquid particles" that implies a superposition of their specific angular momentums. This superposition forms an antidiffusion flow of an angular momentum density into a gravitating spheroidal body. References: [1] Krot, A.M. The statistical model of gravitational interaction of particles. Achievement in Modern Radioelectronics (spec.issue"Cosmic Radiophysics", Moscow), 1996, no.8, pp. 66-81 (in Russian). [2] Krot, A.M. Statistical description of gravitational field: a new approach. Proc. SPIE's 14th Annual Intern.Symp. "AeroSense", Orlando, Florida, USA, 2000, vol.4038, pp.1318-1329. [3] Krot, A.M. The statistical model of rotating and gravitating spheroidal body with the point of view of general relativity. Proc.35th COSPAR Scientific Assembly, Paris, France, 2004, Abstract A-00162. [4] Krot, A. The statistical approach to exploring formation of Solar system. Proc.EGU General Assembly, Vienna, Austria, 2006, Geophys.Res.Abstracts, vol.8, A-00216; SRef-ID: 1607-7962/gra/. [5] Krot, A.M. A statistical approach to investigate the formation of the solar system. Chaos, Solitons and Fractals, 2008, doi:10.1016/j.chaos.2008.06.014. [6] Glansdorff, P. and Prigogine, I. Thermodynamic Theory of Structure, Stability and Fluctuations. London, 1971. [7] Nicolis, G. and Prigogine, I. Self-organization in Nonequilibrium Systems:From Dissipative Structures to Order through Fluctuation. John Willey and Sons, New York etc., 1977.

Krot, A. M.

2009-04-01

144

Coherent transfer of optical orbital angular momentum in multi-order Raman sideband generation.  

PubMed

Experimental results from the generation of Raman sidebands using optical vortices are presented. By generating two sets of sidebands originating from different locations in a Raman-active crystal, one set containing optical orbital angular momentum and the other serving as a reference, Young's double slit experiment was simultaneously realized for each sideband. The interference between the two sets of sidebands was used to determine the helicity and topological charge in each order. Topological charges in all orders were found to be discrete and follow selection rules predicted by a cascaded Raman process. PMID:23381274

Strohaber, J; Zhi, M; Sokolov, A V; Kolomenskii, A A; Paulus, G G; Schuessler, H A

2012-08-15

145

Orbital transfer of large space structures with nuclear electric rockets  

NASA Technical Reports Server (NTRS)

This paper discusses the potential application of electric propulsion for orbit transfer of a large spacecraft structure from low earth orbit to geosynchronous altitude in a deployed configuration. The electric power was provided by the spacecraft nuclear reactor space power system on a shared basis during transfer operations. Factors considered with respect to system effectiveness included nuclear power source sizing, electric propulsion thruster concept, spacecraft deployment constraints, and orbital operations and safety. It is shown that the favorable total impulse capability inherent in electric propulsion provides a potential economic advantage over chemical propulsion orbit transfer vehicles by reducing the number of Space Shuttle flights in ground-to-orbit transportation requirements.

Silva, T. H.; Byers, D. C.

1980-01-01

146

Transfer Ionization in MeV p-He Collisions Studied by Pulsed Recoil-Ion-Momentum Spectroscopy in a Storage Ring\\/Gas Target Experiment  

Microsoft Academic Search

We have investigated the transfer ionization process in fast collisions between protons, stored in the heavy-ion storage and cooler ring CRYRING, and a cold supersonic helium gas-jet target: H+ + He --> H + He2+ + e-. We have refined the COLTRIMS (COLd Target Recoil-Ion-Momentum Spectroscopy) technique by applying time-varying fields in the recoil-ion-momentum spectrometer to block random singly charged

H. T. Schmidt; C. L. Cocke; A. Fardi; J. Jensen; H. Schmidt-Böcking; L. Schmidt; R. Schuch; H. Zettergren; H. Cederquist

2003-01-01

147

Transfer Ionization in MeV p-He Collisions Studied by Pulsed Recoil-Ion-Momentum Spectroscopy in a Storage Ring/Gas Target Experiment  

NASA Astrophysics Data System (ADS)

We have investigated the transfer ionization process in fast collisions between protons, stored in the heavy-ion storage and cooler ring CRYRING, and a cold supersonic helium gas-jet target: H+ + He --> H + He2+ + e-. We have refined the COLTRIMS (COLd Target Recoil-Ion-Momentum Spectroscopy) technique by applying time-varying fields in the recoil-ion-momentum spectrometer to block random singly charged helium ions from single-ionization events.

Schmidt, H. T.; Cocke, C. L.; Fardi, A.; Jensen, J.; Schmidt-Böcking, H.; Schmidt, L.; Schuch, R.; Zettergren, H.; Cederquist, H.

2003-08-01

148

A Large-alphabet Quantum Key Distribution Protocol Using Orbital Angular Momentum Entanglement  

NASA Astrophysics Data System (ADS)

We experimentally demonstrate a quantum key distribution protocol using entangled photon pairs in orbital angular momentum (OAM). Here Alice uses a fixed phase hologram to modulate her OAM state on one photon with a spatial light modulator (SLM), while Bob uses the designed N different phase holograms for his N-based keys on the other photon with his SLM. With coincidences, Alice can fully retrieve the keys sent by Bob without reconciliation. We report the experiment results with N = 3 and OAM eigenmodes |l = ±1>, and discuss the security from the light path and typical attacks.

Zhao, Sheng-Mei; Gong, Long-Yan; Li, Yong-Qiang; Yang, Hua; Sheng, Yu-Bo; Cheng, Wei-Wen

2013-06-01

149

Direct measurements of wind-water momentum coupling in a marsh with emergent vegetation and implications for gas transfer estimates  

NASA Astrophysics Data System (ADS)

Among the numerous ecological benefits of restoring wetlands is carbon sequestration. As emergent vegetation thrive, atmospheric CO2 is removed and converted into biomass that gradually become additional soil. Forecasts and management for these systems rely on accurate knowledge of gas exchange between the atmosphere and the wetland surface waters. Our previous work showed that the rate of gas transfer across the air-water interface is affected by the amount of water column mixing caused by winds penetrating through the plant canopy. Here, we present the first direct measurements of wind-water momentum coupling made within a tule marsh. This work in Twitchell Island in the California Delta shows how momentum is imparted into the water from wind stress and that this wind stress interacts with the surface waters in an interesting way. By correlating three-component velocity signals from a sonic anemometer placed within the plant canopy with data from a novel Volumetric Particle Imager (VoPI) placed in the water, we measure the flux of kinetic energy through the plant canopy and the time-scale of the response. We also use this unique dataset to estimate the air-water drag coefficient using an adjoint method.

Tse, I.; Poindexter, C.; Variano, E. A.

2013-12-01

150

Magnetic electroexcitation of the 0.478 MeV state in 7Li at low momentum transfer  

NASA Astrophysics Data System (ADS)

Five form factor values for the 0.478 MeV transition in 7Li have been measured at ?=180° in the momentum-transfer range, 0.40.8 fm-1 by other investigators. Comparison is made with theoretical calculations. A value of the ground-state transition width ?0(M1)=(7.5+/-1.7)×10-3 eV is found for this transition in agreement with earlier measurements of other workers. NUCLEAR REACTIONS 7Li (e, e'), E0=40-74 MeV; measured d?d? at ?=180° deduced form factors and transition width ?0.

Burt, P. E.; Fagg, L. W.; Crannell, Hall

1982-08-01

151

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

NASA Astrophysics Data System (ADS)

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') 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.; Barbaro, M. B.; Caballero, J. A.; Donnelly, T. W.; Maieron, C.; Udias, J. M.

2010-01-01

152

Proton Transfer Reactivity of Large Multiply Charged Ions  

PubMed Central

Charge-charge interactions dramatically influence the dissociation and proton transfer reactivity of large multiply protonated ions. In combination with tandem mass spectrometry, proton transfer reactions have been used to determine the charge state of an ion and to increase the effective mass resolution of electrospray ionization mass spectra. A model for the proton transfer reactivity of multiply protonated ions, in which protons are assigned to specific sites in an ion based on the intrinsic reactivity of the site and the sum of point-charge Coulomb interactions between charges, is discussed. In combination with experimentally measured rates of proton transfer to bases of known gas-phase basicity, information about the intramolecular electrostatic interactions, gas-phase ion conformation and maximum charge state of an ion produced by electrospray ionization can be obtained.

Williams, Evan R.

2005-01-01

153

A towing concept for orbital transfer of large space structures  

NASA Technical Reports Server (NTRS)

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.

1981-01-01

154

Adaptive attitude control and momentum management for large-angle spacecraft maneuvers  

NASA Technical Reports Server (NTRS)

The fully coupled equations of motion are systematically linearized around an equilibrium point of a gravity gradient stabilized spacecraft, controlled by momentum exchange devices. These equations are then used for attitude control system design of an early Space Station Freedom flight configuration, demonstrating the errors caused by the improper approximation of the spacecraft dynamics. A full state feedback controller, incorporating gain-scheduled adaptation of the attitude gains, is developed for use during spacecraft on-orbit assembly or operations characterized by significant mass properties variations. The feasibility of the gain adaptation is demonstrated via a Space Station Freedom assembly sequence case study. The attitude controller stability robustness and transient performance during gain adaptation appear satisfactory.

Parlos, Alexander G.; Sunkel, John W.

1992-01-01

155

Heat, mass and momentum transfer in edge-defined film-fed crystal growth  

NASA Astrophysics Data System (ADS)

Semi-crystalline silicon sheets which form the base for photovoltaic devices are being grown from the melt by meniscus-defined crystal growth techniques, where heat transfer in melt and solid and to the surroundings interact with the shape of the melt/gas interface to set the shape of the crystal. In the edge defined film fed growth technique (EFG) an inert die is used to control the extent of the melt and to help shape the melt and crystal. The tranport phenomena in the EFG system is mathematically analyzed so as to establish the operating limits for the process and the connections between the actual growth conditions and the quality of the crystal sheet as measured by its compositional uniformity and degree of crystalline perfection.

Ettouney, H. M.

1983-03-01

156

NUMERICAL SIMULATION OF MOMENTUM TRANSFER AND INDUCED CO-FLOW ASSOCIATED WITH SYNTHETIC JETS  

Microsoft Academic Search

A detailed numerical solution of the fluid flow patterns engendered by a synthetic jet has been carried out. The synthetic jet is caused by a reciprocating piston assembly which is attached to a large cavity; one wall of the cavity contains an orifice plate through which fluid is ejected and ingested during the reciprocating cycle. The nature of the operation

John Abraham; AnnMarie Thomas

157

Analysis of the Momentum and Pollutant Transport at the Roof Level of 2D Idealized Street Canyons: a Large-Eddy Simulation Solution  

NASA Astrophysics Data System (ADS)

To investigate the detailed momentum and pollutant transports between urban street canyons and the shear layer, a large-eddy simulation (LES) model was developed to calculate the flow and pollutant dispersion in isothermal conditions. The computational domain consisted of three identical two-dimensional (2D) idealized street canyons of unity aspect ratio. The flow field was assumed to be periodic in the horizontal domain boundaries. The subgrid-scale (SGS) stress was calculated by solving the SGS turbulent kinetic energy (TKE) conservation. An area pollutant source with constant pollutant concentration was prescribed on the ground of all streets. Zero pollutant concentration and an open boundary were applied at the domain inflow and outflow, respectively. The quadrant and budget analyses were employed to examine the momentum and pollutant transports at the roof level of the street canyons. Quadrant analyses of the resolved-scale vertical fluxes of momentum and pollutant along the roof level were performed to compare the contributions of different events/scales to the transport processes. The roof of the street canyon is divided into five segments, namely leeward side, upwind shift, center core, downwind shift and windward side in the streamwise direction. Among the four quadrants considered, the sweeps/ejections, which correspond to the downward/upward motions, dominate the momentum/pollutant transfer. The inward/outward interactions play relatively minor roles. While studying the events in detail, the contribution from the sweeps is mainly large-scale fluctuation compared with that of ejections. Moreover, most of the momentum and pollutant transports take place on the windward side. The strong shear at the roof level initiates instability that in turn promotes the increasing turbulent transport from the leeward side to the windward side. At the same time, the roof-level fluctuations grow linearly in the streamwise direction leading to the vigorous turbulent transport and mixing near the windward facade. Budget analyses of the velocity variance, shear stress, pollutant concentration and pollutant flux were also performed. A sharp peak of TKE production is developed at the roof level. Owing to the strong gradient of streamwise velocity, the streamwise velocity fluctuation is promoted first. The TKE is then transferred from the streamwise to the spanwise and vertical velocity fluctuations via the pressure-rate-of-strain tensor. Analogous to the quadrant analyses, the TKE production grows from a sharp peak (~0.1h width, where h is the building height) on the leeward side to a broad one (~0.5h width) on the windward side. This pattern is partly attributed to the growth of the flow instability and the enhanced turbulent processes along the roof of the street canyon in the streamwise direction. The pollutant removal mechanism is clearly illustrated by the budget analysis of the pollutant concentration. The pollutant is carried by the primary recirculation from the ground level to the roof level of the street canyon. The vertical turbulent pollutant flux dominates the pollutant removal in the region right below the roof level (0.8h

Cheng, Wai Chi; Liu, Chun-Ho

2010-05-01

158

Two-body photodisintegration of the deuteron in the region of small momentum transfers  

Microsoft Academic Search

We propose to measure the differential cross section for the deuteron photodisintegration at t=0+\\/-0.125 (GeV\\/cc)2 and over the energy range from 0.9 to 1.5 GeV, in order to check the prediction of the Regge phenomenology. The experiment can use the CEBAF Large Acceptance Spectrometer (CLAS) and run concurrently with PR-89-045, ``Studies of kaon photoproduction on deuterium.'' The time request for

E. de Sanctis

1992-01-01

159

Two-body photodisintegration of the deuteron in the region of small momentum transfers  

Microsoft Academic Search

We propose to measure the differential cross section for the deuteron photodisintegration at [ital t]=0[plus minus]0.125 (GeV\\/[ital c]c)[sup 2] and over the energy range from 0.9 to 1.5 GeV, in order to check the prediction of the Regge phenomenology. The experiment can use the CEBAF Large Acceptance Spectrometer (CLAS) and run concurrently with PR-89--045, Studies of kaon photoproduction on deuterium.''

De Sanctis

1992-01-01

160

Two-body photodisintegration of the deuteron in the region of small momentum transfers  

Microsoft Academic Search

We propose to measure the differential cross section for the deuteron photodisintegration at t=0±0.125 (GeV\\/cc)2 and over the energy range from 0.9 to 1.5 GeV, in order to check the prediction of the Regge phenomenology. The experiment can use the CEBAF Large Acceptance Spectrometer (CLAS) and run concurrently with PR-89–045, ‘‘Studies of kaon photoproduction on deuterium.’’ The time request for

E. De Sanctis

1992-01-01

161

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

162

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

PubMed

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. PMID:23387584

Vos, M; Weigold, E; Moreh, R

2013-01-28

163

Electroproduction of ?0 at high momentum transfers in non-resonant region with CLAS  

NASA Astrophysics Data System (ADS)

Generalized Parton Distributions (GPDs) offer a new way to access quark and gluon nucleon structure. The nucleon-to-meson transition distribution amplitudes (TDAs) are extensions of the GPD concept to three quark operators. In this talk we report the first preliminary results of studies of the reaction ep --> ep?0 using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab with an electron beam energy of 5.75 GeV. Differential cross sections were extracted for 1.5 < Q2 < 4.5 GeV2, 0.1 < xB < 0.6 and -t up to 6.0 GeV2 in non-resonant region (W > 2.0 GeV). Results will be discussed in the framework of a u-channel TDA model.

Kubarovskiy, Alex; CLAS Collaboration

2013-10-01

164

Momentum Distributions of Nucleons Flying out at Large Angles in (4)He-p-Collisions.  

National Technical Information Service (NTIS)

The experiment has been performed on the 1 m HBC LHE JINR exposed in beams of /sup 4/He nuclei at 8.6 GeV/c and 13.6 GeV/c momenta. Invariant differential cross sections of nucleons flying at large angles with respect to /sup 4/He rest frame have been ana...

T. Sobczak J. Stepaniak V. V. Glagolev

1988-01-01

165

Large-aperture refractive lenses for momentum-resolved spectroscopy with hard X-rays  

PubMed Central

One-dimensional kinoform and prism refractive lenses with large aperture and high transmittance at 22?keV have been investigated. A 12.0?µm focus size (full width at half-maximum) and an effective aperture of 0.85?mm, at a focal length of 705?mm and 21.747?keV, were achieved.

Fukui, Hiroshi; Simon, Markus; Nazmov, Vladimir; Mohr, Jurgen; Evans-Lutterodt, Kenneth; Stein, Aaron; Baron, Alfred Q. R.

2013-01-01

166

Annular Momentum Control Device (AMCD). Volume 2: Application to a Large Space Telescope.  

National Technical Information Service (NTIS)

A conceptual design and set of dynamic equations of a gimbaled AMCD adapted to a Large Space Telescope are presented. Such a system could provide maneuver capability and precision pointing by means of one external gimbal, wheel speed control, and small mo...

1975-01-01

167

Annular Momentum Control Device (AMCD). Volume 2: Application to a large space telescope  

NASA Technical Reports Server (NTRS)

A conceptual design and set of dynamic equations of a gimbaled AMCD adapted to a Large Space Telescope are presented. Such a system could provide maneuver capability and precision pointing by means of one external gimbal, wheel speed control, and small motions of the rim within the magnetic gap.

1975-01-01

168

Quasielastic 12C(e,e'p) reaction at high momentum transfer  

NASA Astrophysics Data System (ADS)

We measured the 12C(e,e'p) cross section as a function of missing energy in parallel kinematics for (q,?)=(970 MeV/c, 330 MeV) and (990 MeV/c, 475 MeV). At ?=475 MeV, at the maximum of the quasielastic peak, there is a large continuum (Em>50 MeV) cross section extending out to the deepest missing energy measured, amounting to almost 50% of the measured cross section. The ratio of data to distorted-wave impulse approximation (DWIA) calculation is 0.4 for both p and s shells. At ?=330 MeV, well below the maximum of the quasielastic peak, the continuum cross section is much smaller and the ratio of data to DWIA calculation is 0.85 for the p shell and 1.0 for the s shell. We infer that one or more mechanisms that increase with ? transform some of the single-nucleon knockouts into a multinucleon knockout, decreasing the valence knockout cross section and increasing the continuum cross section.

Morrison, J. H.; Baghaei, H.; Bertozzi, W.; Gilad, S.; Glickman, J.; Hyde-Wright, C. E.; Kalantar-Nayestanaki, N.; Lourie, R. W.; Penn, S.; Ulmer, P. E.; Weinstein, L. B.; Cottman, B. H.; Ghedira, L.; Winhold, E. J.; Calarco, J. R.; Wise, J.; Boberg, P.; Chang, C. C.; Zhang, D.; Aniol, K.; Epstein, M. B.; Margaziotis, D. J.; Finn, J. M.; Perdrisat, C.; Punjabi, V.

1999-01-01

169

Momentum Transfer Studies and Studies of Linear and Nonlinear Optical Properties of Metal Colloids and Semiconductor Quantum Dots  

NASA Technical Reports Server (NTRS)

Phase 1 of this work involved design work on a momentum transfer device. The progress on design and testing will be presented. Phase 2 involved the systematic study of the MPD thruster for dual uses. Though it was designed as a thruster for space vehicles, the characteristics of the plasma make it an excellent candidate for industrial applications. This project sought to characterize the system for use in materials processing and characterization. The surface modification on ZnCdTe, CdTe, and ZnTe will be presented. Phase 3 involved metal colloids and semiconductor quantum dots. One aspect of this project involves a collaborative effort with the Solid State Division of ORNL. The thrust behind this research is to develop ion implantation for synthesizing novel materials (quantum dots wires and wells, and metal colloids) for applications in all optical switching devices, up conversion, and the synthesis of novel refractory materials. The ions of interest are Au, Ag, Cd, Se, In, P, Sb, Ga, and As. The specific materials of interest are: CdSe, CdTe, InAs, GaAs, InP, GaP, InSb, GaSb, and InGaAs. A second aspect of this research program involves using porous glass (25-200 A) for fabricating materials of finite size. The results of some of this work will also be reported.

Collins, W. E.; Burger, A.; Dyer, K.; George, M.; Henderson, D.; Morgan, S.; Mu, R.; Shi, D.; Conner, D; Thompson, E.; Collins, L.; Curry, L.; Mattox, S.; Williams, G.

1996-01-01

170

Measurement of Momentum Transfer Coefficients for H2, N2, CO, and CO2 Incident Upon Spacecraft Surfaces  

NASA Technical Reports Server (NTRS)

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 H2, N2, CO, and CO2 incident upon the solar array material, Kapton, SiO2-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 the 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, Steven R.; Hoffbauer, Mark A.

1997-01-01

171

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

PubMed

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. PMID:23503010

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

172

Large scale structures and energy transfer in hydrodynamic turbulence  

NASA Astrophysics Data System (ADS)

With the help of direct numerical simulations, we investigate the transfer of energy and triadic interactions in fully developed forced three-dimensional hydrodynamic turbulence. The assumption of locality of transfer among the different scales is one of the building blocks of Kolmogorov (1941) theory of turbulence. We use simulations on a grid of 1024^3 points of a flow forced with a Taylor-Green vortex. Reynolds numbers of R=790 (based on the Taylor lengthscale) are reached. In the steady state, the flow displays a well defined large scale pattern superimposed with turbulent fluctuations at small scales. We find that nonlinear triadic interactions are dominated by their non-local components, involving widely separated scales, even though the nonlinear transfer itself is local and the scaling for the energy spectrum is close to the classical Kolmogorov law. These non-local interactions with large scales represent 20% of the total energy flux. The link between these findings and the intermittency of the small scales, and their consequences for modeling of turbulent flows are also briefly discussed.

Mininni, Pablo

2005-11-01

173

JLab Measurement of the He4 Charge Form Factor at Large Momentum Transfers  

NASA Astrophysics Data System (ADS)

The charge form factor of He4 has been extracted in the range 29 fm-2?Q2?77 fm-2 from elastic electron scattering, detecting He4 recoil nuclei and electrons in coincidence with the high resolution spectrometers of the Hall A Facility of Jefferson Lab. The measurements have uncovered a second diffraction minimum for the form factor, which was predicted in the Q2 range of this experiment. The data are in qualitative agreement with theoretical calculations based on realistic interactions and accurate methods to solve the few-body problem.

Camsonne, A.; Katramatou, A. T.; Olson, M.; Sparveris, N.; Acha, A.; Allada, K.; Anderson, B. D.; Arrington, J.; Baldwin, A.; Chen, J.-P.; Choi, S.; Chudakov, E.; Cisbani, E.; Craver, B.; Decowski, P.; Dutta, C.; Folts, E.; Frullani, S.; Garibaldi, F.; Gilman, R.; Gomez, J.; Hahn, B.; Hansen, J.-O.; Higinbotham, D. W.; Holmstrom, T.; Huang, J.; Iodice, M.; Jiang, X.; Kelleher, A.; Khrosinkova, E.; Kievsky, A.; Kuchina, E.; Kumbartzki, G.; Lee, B.; LeRose, J. J.; Lindgren, R. A.; Lott, G.; Lu, H.; Marcucci, L. E.; Margaziotis, D. J.; Markowitz, P.; Marrone, S.; Meekins, D.; Meziani, Z.-E.; Michaels, R.; Moffit, B.; Norum, B.; Petratos, G. G.; Puckett, A.; Qian, X.; Rondon, O.; Saha, A.; Sawatzky, B.; Segal, J.; Shabestari, M.; Shahinyan, A.; Solvignon, P.; Subedi, R. R.; Suleiman, R.; Sulkosky, V.; Urciuoli, G. M.; Viviani, M.; Wang, Y.; Wojtsekhowski, B. B.; Yan, X.; Yao, H.; Zhang, W.-M.; Zheng, X.; Zhu, L.; Jefferson Lab Hall A Collaboration

2014-04-01

174

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

175

JLab measurement of the 4He charge form factor at large momentum transfers.  

PubMed

The charge form factor of 4He has been extracted in the range 29??fm(-2) ? Q2 ? 77??fm(-2) from elastic electron scattering, detecting 4He recoil nuclei and electrons in coincidence with the high resolution spectrometers of the Hall A Facility of Jefferson Lab. The measurements have uncovered a second diffraction minimum for the form factor, which was predicted in the Q2 range of this experiment. The data are in qualitative agreement with theoretical calculations based on realistic interactions and accurate methods to solve the few-body problem. PMID:24745410

Camsonne, A; Katramatou, A T; Olson, M; Sparveris, N; Acha, A; Allada, K; Anderson, B D; Arrington, J; Baldwin, A; Chen, J-P; Choi, S; Chudakov, E; Cisbani, E; Craver, B; Decowski, P; Dutta, C; Folts, E; Frullani, S; Garibaldi, F; Gilman, R; Gomez, J; Hahn, B; Hansen, J-O; Higinbotham, D W; Holmstrom, T; Huang, J; Iodice, M; Jiang, X; Kelleher, A; Khrosinkova, E; Kievsky, A; Kuchina, E; Kumbartzki, G; Lee, B; LeRose, J J; Lindgren, R A; Lott, G; Lu, H; Marcucci, L E; Margaziotis, D J; Markowitz, P; Marrone, S; Meekins, D; Meziani, Z-E; Michaels, R; Moffit, B; Norum, B; Petratos, G G; Puckett, A; Qian, X; Rondon, O; Saha, A; Sawatzky, B; Segal, J; Shabestari, M; Shahinyan, A; Solvignon, P; Subedi, R R; Suleiman, R; Sulkosky, V; Urciuoli, G M; Viviani, M; Wang, Y; Wojtsekhowski, B B; Yan, X; Yao, H; Zhang, W-M; Zheng, X; Zhu, L

2014-04-01

176

Attitude control/momentum management of the Space Station Freedom for large angle torque-equilibrium-attitude configurations  

NASA Technical Reports Server (NTRS)

An attitude-control and momentum-management (ACMM) system for the Space Station in a large-angle torque-equilibrium-attitude (TEA) configuration is developed analytically and demonstrated by means of numerical simulations. The equations of motion for a rigid-body Space Station model are outlined; linearized equations for an arbitrary TEA (resulting from misalignment of control and body axes) are derived; the general requirements for an ACMM are summarized; and a pole-placement linear-quadratic regulator solution based on scheduled gains is proposed. Results are presented in graphs for (1) simulations based on configuration MB3 (showing the importance of accounting for the cross-inertia terms in the TEA estimate) and (2) simulations of a stepwise change from configuration MB3 to the 'assembly complete' stage over 130 orbits (indicating that the present ACCM scheme maintains sufficient control over slowly varying Space Station dynamics).

Parlos, Alexander G.; Sunkel, John W.

1990-01-01

177

The dual momentum control device for large space systems - An example of distributed system adaptive control  

NASA Technical Reports Server (NTRS)

One area in which large space systems require new technology is attitude control. The paper presents an adaptive control philosophy applicable to the control of distributed systems. An adaptive control system is described for stabilization of the flexible modes of a spinning ring. The system consists of a modal decomposition and identification subsystem, a gain adjustment subsystem, and a feedback control subsystem. Simulations are presented illustrating the adaptive capability of the system. The adaptive controller did produce stable results by quickly identifying the parameter differences and adjusting the feedback controller gains.

Montgomery, R. C.; Johnson, C. R., Jr.

1979-01-01

178

Heat and Momentum Transfer on the Rapid Phase Change of Liquid Induced by Nanosecond-Pulsed Laser Irradiation.  

NASA Astrophysics Data System (ADS)

This study examines the physics of the liquid -vapor phase transition phenomenon induced by nanosecond -pulsed ultraviolet laser irradiation. This work is concerned with the science and technological applications of the phenomenon of rapid nucleation and explosive vaporization of a liquid in contact with a pulsed-laser heated solid surface. The thermodynamics of the phase transition, the kinetics of collective bubble growth and collapse, and the transient development of pressure field have been investigated experimentally by various fast optical sensing techniques. The purpose of this study is to provide new insight into the physics of the liquid-vapor transition and the interaction between laser and liquid-solid interface. A detailed study on the practical aspects of a novel technological application, the laser cleaning technology, is also included. A model system investigated throughout this work is pure water, methanol, or isopropanol in contact with a solid chromium surface that is heated by ultraviolet KrF excimer laser pulses of nanosecond duration. The dynamics of bubble nucleation, growth, and collapse is studied by optical specular reflectance and scattering probe, which isolates the onset of phase transformation with great accuracy. The thermodynamics of phase transition and metastability of liquid matter have been studied by transient photothermal reflectance probe, which monitors the transient temperature field non-intrusively with nanosecond time resolution. The transient response from the photothermal reflectance probe which utilizes temperature-dependent optical properties of an embedded thin film sensor are coupled with heat transfer modeling results in order to predict the thermodynamic condition for the vaporization in nanosecond time scale. The generation of transient pressure pulses by bubble growth and the effect of static pressure on the phase transition are studied by the piezoelectric transducer probe, photoacoustic probe beam deflection technique, and a high-pressure cell. The onset of phase change introduces a strong acoustic signal that is detected by a piezoelectric transducer and a photoacoustic probe. The information on the temperature and pressure development during the vaporization process determines the heat and momentum transfer in the explosive vaporization process. The pressure production mechanisms in the short-pulsed laser-induced vaporization are studied theoretically and experimentally. It is shown that the collective bubble growth is an effective momentum transfer mechanism to radiate acoustic energy. It is observed that the thermally driven phase change generates pressure waves in the liquid that trigger subsequent acoustic cavitation. The implications of the thermal nucleation on the following cavitation is studied. It has been found that the metastabilized microscopic bubbles can exist for much longer time than the apparent life time, subsequently enhancing the following acoustic cavitation. As an example of technological application of the phenomenon, a practical laser cleaning technique has been studied. A laser-cleaning tool capable of removing surface contaminants such as submicron-sized particulates and organic films has been constructed and implemented in practical use.

Park, Hee Kuwon

1994-01-01

179

On the transfer of momentum, heat and mass at the air-sea and air-sea spray interfaces  

Microsoft Academic Search

This dissertation investigates the macroscopic effects of small-scale processes at the air-sea interface in general, with specific attention to the role that sea spray drops play in the exchanges of momentum, heat and mass between the air and the sea. Through scaling analysis and numerical modeling, this work provides a new understanding of the relative contributions to momentum, heat and

James A. Mueller

2009-01-01

180

Comparison of segmental linear and angular momentum transfers in two-handed backhand stroke stances for different skill level tennis players.  

PubMed

The purpose of this study was to investigate the differences of momentum transfer from the trunk and upper extremities to the racket between open and square stances for different skill levels players in the two-handed backhand stroke. The motion capture system with twenty-one reflective markers attached on anatomic landmarks of the subject was used for two-handed backhand stroke motion data collection. Twelve subjects were divided into an advanced group and an intermediate group based on skill level. The three-dimensional linear and angular momentums of the trunk, upper arm, forearm, hand and racket were used for kinetic chain analysis. Results showed that all players with the square stance had significantly larger backward linear momentum contribution in trunk and upper arm than with the open stance (p<.05) irrespective of playing level. However, the external rotation angular momentum of the shoulder joint was significantly larger with an open stance than with a square stance (p=.047). Comparison of playing levels showed that the intermediate group performed higher linear momentum in three components of the trunk, upper arm backward linear momentum, and trunk right bending angular momentum than the advanced group significantly (p<.05). The advanced group reduces trunk linear movement to keep stability and applies trunk and linkage segment rotation to generate backhand stroke power. The advanced group also has a quick backswing for increasing acceleration and maintains longer in the follow-through phase for shock energy absorption. This information could improve training protocol design for teaching the two-handed backhand stroke and teaching players, especially beginners, how to make an effective stroke. PMID:19837630

Wang, Lin-Hwa; Lin, Hwai-Ting; Lo, Kuo-Cheng; Hsieh, Yung-Chun; Su, Fong-Chin

2010-07-01

181

Three-dimensional model for light-induced chaotic rotations in liquid crystals under spin and orbital angular momentum transfer processes  

Microsoft Academic Search

Liquid crystals interacting with light represent a unique class of soft-matter systems that exhibit various generic nonlinear behaviors, including chaotic rotational dynamics. Despite several experimental observations, complex nematic liquid crystal director rotations in presence of spin and orbital angular momentum transfer processes were left unexplained. We present a self-consistent three-dimensional model able to describe the previous experimental observations, accounting for

Etienne Brasselet; Bruno Piccirillo; Enrico Santamato

2008-01-01

182

Dynamic structure factor and dielectric function of silicon for finite momentum transfer: Inelastic x-ray scattering experiments and ab initio calculations  

NASA Astrophysics Data System (ADS)

We present a detailed investigation of the dynamic structure factor S(Q,?) as well as of the dielectric function ?M(Q,?) of the prototypical semiconductor silicon for finite momentum transfer, combining inelastic x-ray scattering measurements and ab initio calculations. We show that, in contrast to optical spectra, for finite momentum transfer, time-dependent density-functional theory in adiabatic local-density approximation (TDLDA) together with the inclusion of lifetime effects in a modified independent-particle polarizability ?0,LT describes the physics of valence excitations with high precision. This applies to the dynamic structure factor as well as to the dielectric function, which demonstrates that TDLDA contains the short-range many-body effects that are crucial for a correct description of ?M(Q,?) in silicon at finite momentum transfer. The form of a nonlocal and energy-dependent exchange-correlation kernel is presented which provides the inclusion of the lifetime effects using the true independent-particle polarizability ?0 . The description of the silicon L2,3 absorption edge has been possible by including the outer core electrons 2s and 2p in the valence electrons of the pseudopotential. The energy of the edge is underestimated but a scissor shift of the respective states by the self-energy correction for these states yields good agreement with experiment. Short-range crystal local-field effects and exchange-correlation effects become important with increasing momentum transfer. The inclusion of crystal local-field effects in the random-phase approximation is able to describe the anisotropy of the response well. Our results demonstrate the quantitative predictive power of the first-principles description.

Weissker, Hans-Christian; Serrano, Jorge; Huotari, Simo; Luppi, Eleonora; Cazzaniga, Marco; Bruneval, Fabien; Sottile, Francesco; Monaco, Giulio; Olevano, Valerio; Reining, Lucia

2010-02-01

183

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

2002-10-14

184

Comparison of Hard Scattering Models for Particle Production at Large Transverse Momentum. 1. Constraints on Hard Collision Cross Sections from Opposite Side Rapidity Distributions.  

National Technical Information Service (NTIS)

Opposite side rapidity distributions at large transverse momentum are analysed using different hard collision models: qq implies qq, qantiq implies MantiM, qM implies qM. We find the hard scattering cross section dsigma/dt to be strongly constrained by th...

E. M. Ilgenfritz J. Kripfganz H. J. Moehring G. Ranft J. Ranft

1977-01-01

185

Charge Asymmetry in Pion Production at Large Transverse Momentum in pi exp - p Collisions at 40 GeV/C and Hard Collision Models.  

National Technical Information Service (NTIS)

pi exp + and pi exp - rapidity distributions for transverse momenta > 1 GeV/c from pi exp - p collisions at 40 GeV/c are discussed in the context of hard collision models for production of large transverse momentum particles. Models with different constit...

A. I. Shklovskaya E. M. Ilgenfritz H. J. Moehring J. Ranft

1977-01-01

186

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

187

Keeping School: Teacher Transfers within a Large District  

ERIC Educational Resources Information Center

Teacher transfers from one worksite to another have a significant impact upon the schools they leave. Researchers and school leaders have proposed a number of solutions to attempt to address teacher transfers, but the rate of teacher transfers remains high. Thus, a better understanding of the motivational factors related to teachers' decisions to…

Thornton, Bill; Perreault, George; Jennings, Mike

2008-01-01

188

Efficient radiative transfer methods for continuum and line transfer in large three-dimensional models  

NASA Astrophysics Data System (ADS)

The relationship between physical conditions of an interstellar cloud and the observed radiation is defined by the radiative transfer problem. Radiative transfer calculations are needed if, e.g., one wants to disentangle abundance variations from excitation effects or wants to model variations of dust properties inside an interstellar cloud. New observational facilities (e.g., ALMA and Herschel) will bring improved accuracy both in terms of intensity and spatial resolution. This will enable detailed studies of the densest sub-structures of interstellar clouds and star forming regions. Such observations must be interpreted with accurate radiative transfer methods and realistic source models. In many cases this will mean modelling in three dimensions. High optical depths and observed wide range of linear scales are, however, challenging for radiative transfer modelling. A large range of linear scales can be accessed only with hierarchical models. Figure 1 shows an example of the use of a hierarchical grid for radiative transfer calculations when the original model cloud (L=10 pc, =500 cm-3) was based a MHD simulation carried out on a regular grid (Juvela & Padoan, 2005). For computed line intensities an accuracy of 10% was still reached when the number of individual cells (and the run time) was reduced by a factor of ten. This illustrates how, as long as cloud is not extremely optically thick, most of the emission comes from a small sub-volume. It is also worth noting that while errors are ~10% for any given point they are much smaller when compared with intensity variations. In particular, calculations on hierarchical grid recovered the spatial power spectrum of line emission with very good accuracy. Monte Carlo codes are used widely in both continuum and line transfer calculations. Like any lambda iteration schemes these suffer from slow convergence when models are optically thick. In line transfer Accelerated Monte Carlo methods (AMC) present a partial solution to this problem (Juvela & Padoan, 2000; Hogerheijde & van der Tak, 2000). AMC methods can be used similarly in continuum calculations to speed up the computation of dust temperatures (Juvela, 2005). The sampling problems associated with high optical depths can be solved with weighted sampling and the handling of models with ?V ~ 1000 is perfectly feasible. Transiently heated small dust grains pose another problem because the calculation of their temperature distribution is very time consuming. However, a 3D model will contain thousands of cells at very similar conditions. If dust temperature distributions are calculated only once for such a set an approximate solution can be found in a much shorter time time. (Juvela & Padoan, 2003; see Figure 2a). MHD simulations with Automatic Mesh Refinement (AMR) techniques present an exciting development for the modelling of interstellar clouds. Cloud models consist of a hierarchy of grids with different grid steps and the ratio between the cloud size and the smallest resolution elements can be 106 or even larger. We are currently working on radiative transfer codes (line and continuum) that could be used efficiently on such grids (see Figure 2b). The radiative transfer problem can be solved relatively independently on each of the sub-grids. This means that the use of convergence acceleration methods can be limited to those sub-grids where they are needed and, on the other hand, parallelization of the code is straightforward.

Juvela, Mika J.

189

Optically driven angular alignment of microcomponents made of in-plane birefringent polyimide film based on optical angular momentum transfer  

Microsoft Academic Search

The optically driven angular alignment of micromachined components (microlenses and microprisms) within a single-beam optical trap using a linearly-polarized laser is presented. This optically induced angular alignment around the laser beam axis results from the spin angular momentum of the laser beam produced by the birefringence of the trapped microcomponents. The microcomponents are fabricated by reactive ion etching of an

E. Higurashi; R. Sawada; T. Ito

2001-01-01

190

Superelastic Electron Scattering within a Magnetic Angle Changer: Determination of the Angular Momentum Transferred during Electron Excitation over All Scattering Angles  

NASA Astrophysics Data System (ADS)

By utilizing superelastic electron scattering from laser-excited atoms within a new magnetic angle changing device, the differential cross sections for excitation of atoms by electron impact over the complete scattering geometry are determined for the first time. In the experiments described here, these techniques are combined to reveal the angular momentum transferred to calcium atoms during electron excitation to the 4P11 state, from near 0° to beyond 180°. The experiments are discussed, and results presented for energies of 45 and 55 eV. These results are compared to calculations using a distorted wave Born approximation.

Hussey, Martyn; Murray, Andrew; MacGillivray, William; King, George C.

2007-09-01

191

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

2007-11-16

192

Modeling on the Momentum and Heat\\/Mass Transfer Characteristics of an Argon Plasma Jet Issuing into Air Surroundings and Interacting with a Counter-Injected Argon Jet  

Microsoft Academic Search

Modeling study is performed to reveal the momentum and heat\\/mass transfer characteristics of a turbulent or laminar plasma\\u000a reactor consisting of an argon plasma jet issuing into ambient air and interacting with a co-axially counter-injected argon\\u000a jet. The combined-diffusion-coefficient method and the turbulence-enhanced combined-diffusion-coefficient method are employed\\u000a to treat the diffusion of argon in the argon–air mixture for the laminar

Hai-Xing WangXi; Xi Chen; He-Ping Li

2011-01-01

193

Large scale structures and energy transfer in hydrodynamic turbulence  

Microsoft Academic Search

With the help of direct numerical simulations, we investigate the transfer of energy and triadic interactions in fully developed forced three-dimensional hydrodynamic turbulence. The assumption of locality of transfer among the different scales is one of the building blocks of Kolmogorov (1941) theory of turbulence. We use simulations on a grid of 1024^3 points of a flow forced with a

Pablo Mininni

2005-01-01

194

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

NASA Astrophysics Data System (ADS)

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.

2011-06-01

195

Large-Scale Turbulence Structures and Their Contributions to the Momentum Flux and Turbulence in the Near-Neutral Atmospheric Boundary Layer Observed from a 213-m Tall Meteorological Tower  

NASA Astrophysics Data System (ADS)

Large-scale turbulence structures in the near-neutral atmospheric boundary layer (ABL) are investigated on the basis of observations made from the 213-m tall meteorological tower at Tsukuba, Japan. Vertical profiles of wind speed and turbulent fluxes in the ABL were obtained with sonic anemometer-thermometers at six levels of the tower. From the archived data, 31 near-neutral cases are selected for the analysis of turbulence structures. For the typical case, event detection by the integral wavelet transform with a large time scale (180 s) from the streamwise velocity component ( u) at the highest level (200 m) reveals a descending high-speed structure with a time scale of approximately 100 s (a spatial scale of 1 km at the 200-m height). By applying the wavelet transform to the u velocity component at each level, the intermittent appearance of large-scale high-speed structures extending also in the vertical is detected. These structures usually make a large contribution to the downward momentum transfer and induce the enhancement of turbulent kinetic energy. This behaviour is like that of "active" turbulent motions. From the analysis of the two-point space-time correlation of wavelet coefficients for the u velocity component, the vertical extent and the downward influence of large-scale structures are examined. Large fluctuations in the large-scale range (wavelet variance at the selected time scale) at the 200-m level tend to induce the large correlation between the higher and lower levels.

Horiguchi, Mitsuaki; Hayashi, Taiichi; Adachi, Ahoro; Onogi, Shigeru

2012-08-01

196

Alternating heat transfer between objects of large geometrical difference  

Microsoft Academic Search

The heat transfer on the surface of an object in a gas fluidised bed is sequentially and alternately induced by particle-packet and gas bubble. This phenomenon is studied with computational simulation. The particle-packet and bubble are modelled by a double particle-layers and porous medium model and a hemispherical model, respectively. The heat transfer to and within the object is simulated

W. M. Gao; L. X. Kong; P. D. Hodgson

2007-01-01

197

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

198

Associated production of an isolated, large-transverse-momentum lepton (electron or muon), and two jets at the CERN pp collider  

Microsoft Academic Search

A clear signal is observed for the production of an isolated large-transverse-momentum lepton in association with two or three centrally produced jets. The two-jet events cluster around the W+\\/- mass, indicating a novel decay of the Intermediate Vector Boson. The rate and features of these events are not consistent with expectations of known quark decays (charm, bottom). They are, however,

Geoffrey T J Arnison; O. C. Allkofer; Alan Astbury; Bernard Aubert; C. Bacci; G. Bauer; A. Bézaguet; R. K. Bock; T. J. V. Bowcock; M. Calvetti; P. Catz; P. Cennini; S. Centro; F. Ceradini; S. Cittolin; D. Cline; C. Cochet; J. Colas; M. Corden; D. Dallman; D. Dau; M. Debeer; M. Della Negra; M. Demoulin; D. Denegri; D. Dibitonto; A. di Ciaccio; L. Dobrzynski; J. D. Dowell; K. Eggert; E. Eisenhandler; N. Ellis; P. Erhard; H. Faissner; M. Fincke; P. Flynn; G. Fontaine; R. Frey; R. Frühwirth; J. Garvey; S. Geer; C. Ghesquière; P. Ghez; W. R. Gibson; Y. Giraud-Héraud; A. Givernaud; A. Gonidec; G. Grayer; W. Guryn; Traudl Hansl-Kozanecka; W. J. Haynes; L. O. Hertzberger; D. Hoffmann; H. Hoffmann; D. J. Holthuizen; R James Homer; A K Honma; Werner Jank; Ginette Jorat; Peter I P Kalmus; V. Karimäki; Richard K Keeler; Ian Richard Kenyon; A. Kernan; Ritva Kinnunen; Witold Kozanecki; Didier Kryn; P. Kyberd; F. Lacava; J.-P. Laugier; J.-P. Lees; H. Lehmann; R. Leuchs; A. Lévêque; D. Linglin; E. Locci; M. Loret; T W Markiewicz; Guy Maurin; T. McMahon; J.-P. Mendiburu; M.-N. Minard; M. Mohammadi; M. Moricca; K. Morgan; F. Muller; A. K. Nandi; Lutz Naumann; Alan Robert Norton; A. Orkin-Lecourtois; L. Paoluzi; F. Paus; G. Piano Mortari; E. Pietarinen; M. Pimiä; D. Pitman; Alfredo Placci; J.-P. Porte; E. Radermacher; J. Ransdell; H. Reithler; Jean Pierre Charles Revol; J. Rich; M. Rijssenbeek; C. Roberts; J. Rohlf; P. Rossi; C. Rubbia; B. Sadoulet; G Salvini; J. Sass; A. Savoy-Navarro; D. Schinzel; W. Scott; T. P. Shah; I. Sheer; D. Smith; J. Strauss; J. Streets; K. Sumorok; F. Szoncso; C. Tao; G. Thompson; J. Timmer; E. Tscheslog; J. Tuominiemi; B. van Eijk; J.-P. Vialle; J. Vrana; V. Vuillemin; H. D. Wahl; P. Watkins; J. Wilson; I. Wingerter; C.-E. Wulz; M. Yvert

1984-01-01

199

Experimental Determination of the Average Fraction of Jet Momentum Carried by the Leading Hadrons Produced at Large Transverse Momenta  

Microsoft Academic Search

The average fraction (equiv) of jet momentum carried by the associated charged leading hadron has been determined in the reaction p + N to h_1 + h_2 + X where h_1 and h_2 were two high P _bot hadrons, leading particles of two jets produced at high P_bot. A 800 GeV\\/c proton beam and four nuclear targets: beryllium, aluminium, iron

Gianluigi Boca

1990-01-01

200

Astronomy, Data and the Problem of Large File Transfers  

NASA Astrophysics Data System (ADS)

During the lifetime of a survey a considerable amount of data are produced, this data needs to be moved between processing centres quickly and efficiently. Over time there has been a jostling as to which method of transferring data from one location to another is best: tape, disk or network, as they say ``Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway." With the VDFS the most painless solution seems to have been using network transfers. We started by using JANET to transfer our data but the rising monetary cost and unreliable transfer speeds when dealing with terabyte scale data volumes led us to investigate alternatives. Here we describe our work on connecting to the UKLight network, run by UKERNA, alongside JANET. This network provided us with a dedicated 1Gbit/s dark fibre for our sole use that allows us to transfer astronomical data between CASU and WFAU at speeds that are limited more by end server hardware than by the network (so maybe we can beat that station wagon.)

Bryant, J.; Sutorius, E.; Bunclark, P. S.

2008-08-01

201

Deposition of thin silicon layers on transferred large area graphene  

SciTech Connect

Physical vapor deposition of Si onto transferred graphene is investigated. At elevated temperatures, Si nucleates preferably on wrinkles and multilayer graphene islands. In some cases, however, Si can be quasi-selectively grown only on the monolayer graphene regions while the multilayer islands remain uncovered. Experimental insights and ab initio calculations show that variations in the removal efficiency of carbon residuals after the transfer process can be responsible for this behavior. Low-temperature Si seed layer results in improved wetting and enables homogeneous growth. This is an important step towards realization of electronic devices in which graphene is embedded between two Si layers.

Lupina, Grzegorz, E-mail: lupina@ihp-microelectronics.com; Kitzmann, Julia; Lukosius, Mindaugas; Dabrowski, Jarek; Wolff, Andre; Mehr, Wolfgang [IHP, Im Technologiepark 25, 15236 Frankfurt (Oder) (Germany)] [IHP, Im Technologiepark 25, 15236 Frankfurt (Oder) (Germany)

2013-12-23

202

Deposition of thin silicon layers on transferred large area graphene  

NASA Astrophysics Data System (ADS)

Physical vapor deposition of Si onto transferred graphene is investigated. At elevated temperatures, Si nucleates preferably on wrinkles and multilayer graphene islands. In some cases, however, Si can be quasi-selectively grown only on the monolayer graphene regions while the multilayer islands remain uncovered. Experimental insights and ab initio calculations show that variations in the removal efficiency of carbon residuals after the transfer process can be responsible for this behavior. Low-temperature Si seed layer results in improved wetting and enables homogeneous growth. This is an important step towards realization of electronic devices in which graphene is embedded between two Si layers.

Lupina, Grzegorz; Kitzmann, Julia; Lukosius, Mindaugas; Dabrowski, Jarek; Wolff, Andre; Mehr, Wolfgang

2013-12-01

203

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

204

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

205

Large enhancement of Förster resonance energy transfer on graphene platforms  

NASA Astrophysics Data System (ADS)

In view of the applications of Förster resonant energy transfer (FRET) in biological systems which especially require FRET in the infrared region, we investigate the great advantage of graphene plasmonics in such studies. Focusing on the fundamental aspects of FRET between a donor-acceptor pair on a graphene platform showing that FRET mediated by the plasmons in graphene is broadband and enhanced by six orders of magnitude. We briefly discuss the impact of phonon-polaritonic substrates.

Biehs, S.-A.; Agarwal, G. S.

2013-12-01

206

Efficient radiative transfer methods for continuum and line transfer in large three-dimensional models  

Microsoft Academic Search

The relationship between physical conditions of an interstellar cloud and the observed radiation is defined by the radiative transfer problem. Radiative transfer calculations are needed if, e.g., one wants to disentangle abundance variations from excitation effects or wants to model variations of dust properties inside an interstellar cloud. New observational facilities (e.g., ALMA and Herschel) will bring improved accuracy both

Mika J. Juvela

2005-01-01

207

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

208

Direct determination of strain and composition profiles in SiGe islands by anomalous x-Ray diffraction at high momentum transfer.  

PubMed

Anomalous x-ray scattering is employed for quantitative measurements of the Ge composition profile in islands on Si(001). The anomalous effect in SiGe is enhanced exploiting the dependence of the complex atomic form factors on the momentum transfer. Comparing the intensity ratios for x-ray energies below and close to the K edge of Ge at various Bragg reflections in the grazing incidence diffraction setup, the sensitivity for the Ge profile is considerably enhanced. The method is demonstrated for SiGe dome-shaped islands grown on Si(001). It is found that the composition inside the island changes rather abruptly, whereas the lattice parameter relaxes continuously. PMID:12633307

Schülli, T U; Stangl, J; Zhong, Z; Lechner, R T; Sztucki, M; Metzger, T H; Bauer, G

2003-02-14

209

Large oncosomes mediate intercellular transfer of functional microRNA  

PubMed Central

Prostate cancer cells release atypically large extracellular vesicles (EVs), termed large oncosomes, which may play a role in the tumor microenvironment by transporting bioactive molecules across tissue spaces and through the blood stream. In this study, we applied a novel method for selective isolation of large oncosomes applicable to human platelet-poor plasma, where the presence of caveolin-1-positive large oncosomes identified patients with metastatic disease. This procedure was also used to validate results of a miRNA array performed on heterogeneous populations of EVs isolated from tumorigenic RWPE-2 prostate cells and from isogenic non-tumorigenic RWPE-1 cells. The results showed that distinct classes of miRNAs are expressed at higher levels in EVs derived from the tumorigenic cells in comparison to their non-tumorigenic counterpart. Large oncosomes enhanced migration of cancer-associated fibroblasts (CAFs), an effect that was increased by miR-1227, a miRNA abundant in large oncosomes produced by RWPE-2 cells. Our findings suggest that large oncosomes in the circulation report metastatic disease in patients with prostate cancer, and that this class of EV harbors functional molecules that may play a role in conditioning the tumor microenvironment.

Morello, Matteo; Minciacchi, Valentina R; de Candia, Paola; Yang, Julie; Posadas, Edwin; Kim, Hyung; Griffiths, Duncan; Bhowmick, Neil; Chung, Leland WK; Gandellini, Paolo; Freeman, Michael R; Demichelis, Francesca; Di Vizio, Dolores

2013-01-01

210

Large oncosomes mediate intercellular transfer of functional microRNA.  

PubMed

Prostate cancer cells release atypically large extracellular vesicles (EVs), termed large oncosomes, which may play a role in the tumor microenvironment by transporting bioactive molecules across tissue spaces and through the blood stream. In this study, we applied a novel method for selective isolation of large oncosomes applicable to human platelet-poor plasma, where the presence of caveolin-1-positive large oncosomes identified patients with metastatic disease. This procedure was also used to validate results of a miRNA array performed on heterogeneous populations of EVs isolated from tumorigenic RWPE-2 prostate cells and from isogenic non-tumorigenic RWPE-1 cells. The results showed that distinct classes of miRNAs are expressed at higher levels in EVs derived from the tumorigenic cells in comparison to their non-tumorigenic counterpart. Large oncosomes enhanced migration of cancer-associated fibroblasts (CAFs), an effect that was increased by miR-1227, a miRNA abundant in large oncosomes produced by RWPE-2 cells. Our findings suggest that large oncosomes in the circulation report metastatic disease in patients with prostate cancer, and that this class of EV harbors functional molecules that may play a role in conditioning the tumor microenvironment. PMID:24091630

Morello, Matteo; Minciacchi, Valentina R; de Candia, Paola; Yang, Julie; Posadas, Edwin; Kim, Hyung; Griffiths, Duncan; Bhowmick, Neil; Chung, Leland W K; Gandellini, Paolo; Freeman, Michael R; Demichelis, Francesca; Di Vizio, Dolores

2013-11-15

211

Effect of developing flow and thermal regime on momentum and heat transfer in micro-scale heat sink  

Microsoft Academic Search

A developing micro-channel heat transfer and fluid flow has been investigated experimentally in rectangular micro-channels of Dh=440?m, having water as a working fluid. Infrared technique was used to design and built a micro-channel test section that incorporate internal fluid temperature measurements. The new method that provides information about the fluid temperature distribution inside the channel and provides validation for the

Y. Mishan; A. Mosyak; E. Pogrebnyak; G. Hetsroni

2007-01-01

212

Inclusive pi0 Production at Large Transverse Momentum from pi+\\/-p and pp Interactions at 100 and 200 GeV\\/c  

Microsoft Academic Search

We have measured large-transverse-momentum (p?) inclusive pi0 production at c.m. angles centered near 90° for pi+\\/-p and pp interactions at 100 and 200 GeV\\/c. This is the first such measurement using a pion beam. The ratio sigma(pp-->pi0X)sigma(pip-->pi0X) decreases with increasing p? and is independent of energy when expressed as a function of x?=p?p. We compare the data with predictions of

G. Donaldson; H. Gordon; K.-W. Lai; I. Stumer; A. Barnes; J. Mellema; A. Tollestrup; R. Walker; O. Dahl; R. A. Johnson; A. Ogawa; M. Pripstein; S. Shannon

1976-01-01

213

MESSENGER Observations of Large Flux Transfer Events at Mercury  

NASA Technical Reports Server (NTRS)

Six flux transfer events (FTEs) were encountered during MESSENGER's first two flybys of Mercury (MI and M2). For MI the interplanetary magnetic field (IMF) was predominantly northward and four FTEs with durations of 1 to 6 s were observed in the magnetosheath following southward 1M F turnings. The IMF was steadily southward during M2, and an FTE 4 s in duration was observed just inside the dawn magnetopause followed approx.32 s later by a 7-s FTE in the magnetosheath. Flux rope models were fit to the magnetic field data to detem11ne PTE dimensions and flux content The largest FTE observed by MESSENGER had a diameter of approx. 1 R(sub M) (where R(sub M) is Mercury's radius), and its open magnetic field increased the fraction of the surface exposed to the solar wind by 10 - 20 percent and contributed up to approx.30 kV to the cross-magnetospheric electric potential.

Slavin, James A.; Lepping, Ronald P.; Wu, Chin-Chun; Anderson, Brian J.; Baker, Daniel N.; Benna, Mehdi; Boardsen, Scott A.; Killen, Rosemary M.; Korth, Haje; Krimigis, Stamatios M.; McClintock, William E.; McNutt, Ralph L., Jr.; Sarantos, Menelaos; Schriver, David; Solomon, Sean C.; Travnicek, Pavel; Zurbuchen, Thomas H.

2010-01-01

214

An analytical study of momentum and heat transfer in turbulent forced convection in rectangular channels with allowance for secondary effects  

NASA Astrophysics Data System (ADS)

The effects of the anisotropic turbulent transport properties and turbulence-induced secondary flow on the main flow field and the temperature distribution in a rectangular channel under fully developed flow and heat transfer conditions were analyzed. The effects of peripheral wall conduction and radiation within the channel were also studied. The analysis reveals that only a single secondary current occurs in the trapezoidal symmetry element of the rectangular duct. When the heating extends over one or two oppositely located sides only, the location of the maximum wall temperature is shifted from the corner to the center of the wall.

Nagel, H.

1982-05-01

215

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...

216

A numerical study of momentum and forced convection heat transfer around two tandem circular cylinders at low Reynolds numbers. Part II: Forced convection heat transfer  

Microsoft Academic Search

This work presents a computational study of the forced convection heat transfer around two circular cylinders in tandem. Axisymmetric, steady, laminar flow around the cylinders was assumed. The temperature inside the cylinders is considered spatially uniform but not constant in time. Numerical solutions have been obtained in bipolar cylindrical coordinates. The finite difference method was used to discretize the equations

Gheorghe Juncu

2007-01-01

217

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

218

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

219

An experimental study of heat transfer in a large-scale turbine rotor passage  

Microsoft Academic Search

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil and for the hub endwall surface. The objective of this program was to document the effects of flow three dimensionality on the

M. F. Blair

1994-01-01

220

Clean-lifting transfer of large-area residual-free graphene films.  

PubMed

A unique "clean-lifting transfer" (CLT) technique that applies a controllable electrostatic force to transfer large-area and high-quality CVD-grown graphene onto various rigid or flexible substrates is reported. The CLT technique without using any organic support or adhesives can produce residual-free graphene films with large-area processability, and has great potential for future industrial production of graphene-based electronics or optoelectronics. PMID:23813552

Wang, Di-Yan; Huang, I-Sheng; Ho, Po-Hsun; Li, Shao-Sian; Yeh, Yun-Chieh; Wang, Duan-Wei; Chen, Wei-Liang; Lee, Yu-Yang; Chang, Yu-Ming; Chen, Chia-Chun; Liang, Chi-Te; Chen, Chun-Wei

2013-08-27

221

Large-area dual-scale metal transfer by adhesive force  

NASA Astrophysics Data System (ADS)

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 metal transfer from a single master. A simple metal wire grid polarizer was fabricated and analyzed using this method.

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

2008-08-01

222

Phenomenological manifestations of large-curvature tunneling in hydride-transfer reactions  

SciTech Connect

An important consequence of recent dynamical theories of tunneling is that, because of large curvature of the reaction path in a typical H(+), or H(-) transfer, light-isotope transfer occurs in more extended nuclear frameworks than heavy-isotope transfer. This is now incorporated into the Marcus phenomenological theory relating reaction rate constants to equilibrium constants. It leads to Bronsted slope parameters that depend on the isotope transferred. The new theoretical formulation is tested on experimental data for hydride and deuteride transfer between nicotinamide adenine dinucleotide analogs and on computational data for hydrogen-atom and deuterium atom transfer between pseudo-atoms. The experimental kinetic isotope effects (KIE's) are shown to vary with reaction equilibrium constant (K/sub ij/) in a way that is quantitatively consistent with the theory. The critical configurations generated by the calculations vary from the saddle point and from each other in the way anticipated by the theory. However, the calculated KIE values are a rather scattered function of K/sub ij/, because the tunneling corrections are large and somewhat system specific. Overall, we believe that this combination of experimental and calculated results provides considerable support for the idea that large-curvature results provides considerable support for the idea that large-curvature tunneling needs to be considered in hydrogen transfer reactions.

Kreevoy, M.M.; Ostovic, D.; Truhlar, D.G.; Garrett, B.C.

1986-01-01

223

Multiple Phenotypic Changes Associated with Large-Scale Horizontal Gene Transfer  

PubMed Central

Horizontal gene transfer often leads to phenotypic changes within recipient organisms independent of any immediate evolutionary benefits. While secondary phenotypic effects of horizontal transfer (i.e., changes in growth rates) have been demonstrated and studied across a variety of systems using relatively small plasmids and phage, little is known about the magnitude or number of such costs after the transfer of larger regions. Here we describe numerous phenotypic changes that occur after a large-scale horizontal transfer event (?1 Mb megaplasmid) within Pseudomonas stutzeri including sensitization to various stresses as well as changes in bacterial behavior. These results highlight the power of horizontal transfer to shift pleiotropic relationships and cellular networks within bacterial genomes. They also provide an important context for how secondary effects of transfer can bias evolutionary trajectories and interactions between species. Lastly, these results and system provide a foundation to investigate evolutionary consequences in real time as newly acquired regions are ameliorated and integrated into new genomic contexts.

Dougherty, Kevin; Smith, Brian A.; Moore, Autumn F.; Maitland, Shannon; Fanger, Chris; Murillo, Rachel; Baltrus, David A.

2014-01-01

224

Large aperture deformable mirror with a transferred single-crystal silicon membrane actuated using large-stroke PZT Unimorph Actuators  

NASA Technical Reports Server (NTRS)

We have demonstrated a large aperture (50 mm x 50 mm) continuous membrane deformable mirror (DM) with a large-stroke piezoelectric unimorph actuator array. The DM consists of a continuous, large aperture, silicon membrane 'transferred' in its entirety onto a 20 x 20 piezoelectric unimorph actuator array. A PZT unimorph actuator, 2.5 mm in diameter with optimized PZT/Si thickness and design showed a deflection of 5.7 [m at 20V. An assembled DM showed an operating frequency bandwidth of 30 kHz and influence function of approximately 30%.

Hishinumat, Yoshikazu; Yang, Eui - Hyeok (EH)

2005-01-01

225

Analyzing powers and proton spin transfer coefficients in the elastic scattering of 800 MeV polarized protons from an L-type polarized deuteron target at small momentum transfers  

SciTech Connect

Analyzing powers and spin transfer coefficients which describe the elastic scattering of polarized protons from a polarized deuteron target have been measured. The energy of the proton beam was 800 MeV and data were taken at laboratory scattering angles of 7, 11, 14, and 16.5 degrees. One analyzing power was also measured at 180 degrees. Three linearly independent orientations of the beam polarization were used and the target was polarized parallel and antiparallel to the direction of the beam momentum. The data were taken with the high resolution spectrometer at the Los Alamos Meson Physics Facility (experiment 685). The results are compared with multiple scattering predictions based on Dirac representations of the nucleon-nucleon scattering matrices. 27 refs., 28 figs., 4 tabs.

Adams, D.L.

1986-10-01

226

Quasielastic thinsp{sup 12}C(e,e{sup {prime}}p) reaction at high momentum transfer  

SciTech Connect

We measured the {sup 12}C(e,e{sup {prime}}p) cross section as a function of missing energy in parallel kinematics for (q,{omega})=(970 MeV/c, 330 MeV) and (990 MeV/c, 475 MeV). At {omega}=475 MeV, at the maximum of the quasielastic peak, there is a large continuum (E{sub m}{gt}50 MeV) cross section extending out to the deepest missing energy measured, amounting to almost 50{percent} of the measured cross section. The ratio of data to distorted-wave impulse approximation (DWIA) calculation is 0.4 for both {ital p} and {ital s} shells. At {omega}=330 MeV, well below the maximum of the quasielastic peak, the continuum cross section is much smaller and the ratio of data to DWIA calculation is 0.85 for the {ital p} shell and 1.0 for the {ital s} shell. We infer that one or more mechanisms that increase with {omega} transform some of the single-nucleon knockouts into a multinucleon knockout, decreasing the valence knockout cross section and increasing the continuum cross section. {copyright} {ital 1999} {ital The American Physical Society}

Morrison, J.H.; Baghaei, H.; Bertozzi, W.; Gilad, S.; Glickman, J.; Hyde-Wright, C.E.; Kalantar-Nayestanaki, N.; Lourie, R.W.; Penn, S.; Ulmer, P.E.; Weinstein, L.B. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)] [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Cottman, B.H.; Ghedira, L.; Winhold, E.J. [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12181 (United States)] [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12181 (United States); Calarco, J.R.; Wise, J. [Department of Physics, University of New Hampshire, Durham, New Hampshire 03824 (United States)] [Department of Physics, University of New Hampshire, Durham, New Hampshire 03824 (United States); Boberg, P.; Chang, C.C.; Zhang, D. [Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)] [Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States); Aniol, K.; Epstein, M.B.; Margaziotis, D.J. [Department of Physics and Astronomy, California State University, Los Angeles, California 90032 (United States)] [Department of Physics and Astronomy, California State University, Los Angeles, California 90032 (United States); Finn, J.M.; Perdrisat, C.; Punjabi, V. [Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 (United States)] [Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 (United States)

1999-01-01

227

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

228

Elastic scattering of {59.54}-keV ?-rays in elements with {22 ? {Z} ? {92}} at momentum transfer {0.4 ? {x} ? 4.7 {Å}-1}  

NASA Astrophysics Data System (ADS)

Differential cross sections for elastic scattering of the 59.54 keV ?-rays in elements with 22 ?Z ?92 have been measured over the angular range 10?-160?corresponding to the momentum transfer 0.4 ?x ?4.7 Å-1. The measurements at forward and backward angles were performed using the 241Am radioactive point-source, target and the Ge detectors in the transmission and reflection arrangements, respectively. The measured differential scattering cross sections are compared with those based on the form-factor (FF) formalism and state-of-the-art S-matrix calculations to differentiate between their relative efficacies and to check angular-dependence of the anomalous scattering factors (ASF) incorporated as correction to the modified form-factor (MF). The S-matrix values exhibit agreement with the measured data at backward angles and differences ˜10% at forward angles. The scattering cross sections based on the MF including ASF’s are in general lower at various angles by up to 20% for medium- and high-Z elements. The observed deviations being higher at the forward angles infer possibility of angular-dependence of ASF’s.

Kumar, S.; Sharma, V.; Shahi, J. S.; Mehta, D.; Singh, N.

2009-10-01

229

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

NASA Astrophysics Data System (ADS)

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; Lund, Eric J.; Grossbard, Neil

2010-06-01

230

Primary-energy dependence of the momentum transfer in reflection inner-shell-electron energy-loss spectra of layered transition-metal dichalcogenides  

NASA Astrophysics Data System (ADS)

Sulfur L2.3 and titanium L2.3 and M2.3 inner-shell-electron energy-loss spectra in 1T-TiS2, 1T-TiSe2, 2H-TaS2, and 2H-MoS2 have been measured at various primary energies in the reflection mode. A remarkable primary-energy dependence is found. As the primary energy decreases, the first peak that is assigned to the unoccupied t2g band for the 1T compounds & band for 2H-TaS2 increases in intensity relative to the second peak. The peak positions are almost unchanged. They are in agreement with those of band-structure calculations and x-ray absorption spectra. The primary-energy dependence has been discussed mainly in terms of the breakdown of dipole selection rules due to momentum transfer involved in the inelastic scattering process and anisotropy in electronic structures.

Ohno, Youichi

1987-11-01

231

Angular Momentum  

ERIC Educational Resources Information Center

The gyroscope in a smartphone was employed in a physics laboratory setting to verify the conservation of angular momentum and the nonconservation of rotational kinetic energy. As is well-known, smartphones are ubiquitous on college campuses. These devices have a panoply of built-in sensors. This creates a unique opportunity for a new paradigm in…

Shakur, Asif; Sinatra, Taylor

2013-01-01

232

Integrated test rig for tether hardware, real-time simulator and control algorithms: Robust momentum transfer validated  

NASA Astrophysics Data System (ADS)

In preparation of the ESA demonstration mission for a tethered sample return capability from ISS, a breadboard test has been performed to validate the robust StarTrack tether dynamics control algorithms in conjunction with the constructed hardware. The proposed mission will use hardware inherited from the YES mission (Kruijff, 1999). A tether spool is holding a 7 kg, 35 km Dyneema tether. A 45 kg re-entry capsule will be ejected by springs and then deployed by gravity gradient. The dynamics are solely controlled by a barberpole type friction brake, similar to the SEDS hardware. This hardware is integrated in a test rig, based on the TMM&M stand, that has been upgraded to accommodate both a Space Part (abruptly applied initial tether deployment speed, fine tensiometer, real-time space tether simulator using the tensiometer measurements as input, take-up roller deploying the tether at a simulator-controlled speed) and a Satellite Part (infra-red beams inside the tether canister, control computer estimating deployed length and required extra braking from the IRED interrupts, `barberpole' friction brake). So the set-up allows for a tether deployment with closed loop control, all governed by a real-time comprehensive tether dynamics simulation. The tether deployment is based on the two-stage StarTrack deployment. This scheme stabilizes the tether at an intermediate vertical stage (with 3 km deployed). When the orbit and landing site have synchronized, a high-speed deployment follows to a large angle. When the fully deployed 35-km tether swings to the vertical at approximately 40 m/s, it is cut at a prefixed time optimized for landing site accuracy. The paper discusses the tests performed to characterize the designed hardware, maturing of the developed algorithms with respect to the hardware noise levels and the difficulties and limitations of the test rig. It is found that the set-up can be applied to a variety of tether pre-mission tests. It is shown that the performed tests give confidence in a successful flight application. .

Kruijff, Michiel; van der Heide, Erik Jan

2001-02-01

233

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.

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.; Bruneliere, R.; Brunet, S.

2012-12-01

234

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

235

Heat transfer coefficient of wheel rim of large capacity steam turbines  

Microsoft Academic Search

A way of calculating the overall equivalent heat transfer coefficient of wheel rims of large capacity steam turbines is presented.\\u000a The method and formula to calculate the mean forced convection heat-transfer coefficient of the surface of the blade and for\\u000a the bottom wall of the blade passage, are introduced. The heat transmission from the blade to the rim was simplified

Jinyuan Shi; Zhicheng Deng; Yu Yang; Ganwen Jun

2008-01-01

236

An experimental study of heat transfer in a large-scale turbine rotor passage  

Microsoft Academic Search

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil as well as for the hub endwall surface. The objective of this program was to document the effects of flow three-dimensionality on

Michael F. Blair

1992-01-01

237

A novel method for large area graphene transfer on the polymer optical fiber.  

PubMed

We develop two simple methods-the dip coat stamping and lift-off methods-to transfer large area, high quality graphene films onto the top and side faces of the polymer optical fiber. The graphene films can be synthesized using chemical vapor deposition method on large Cu foils. After synthesis, the graphene films are characterized by scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The polymer optical fiber probe with the transferred graphene film can be used as a chemical sensor for the detection of various organic aerosols. PMID:22852325

Kulkarni, Atul; Kim, Hyeongkeun; Amin, Rashid; Park, Sung Ha; Hong, Byung Hee; Kim, Taesung

2012-05-01

238

Efficient transfer of large-area graphene films onto rigid substrates by hot pressing.  

PubMed

Graphene films grown on metal substrates by chemical vapor deposition (CVD) method have to be safely transferred onto desired substrates for further applications. Recently, a roll-to-roll (R2R) method has been developed for large-area transfer, which is particularly efficient for flexible target substrates. However, in the case of rigid substrates such as glass or wafers, the roll-based method is found to induce considerable mechanical damages on graphene films during the transfer process, resulting in the degradation of electrical property. Here we introduce an improved dry transfer technique based on a hot-pressing method that can minimize damage on graphene by neutralizing mechanical stress. Thus, we enhanced the transfer efficiency of the large-area graphene films on a substrate with arbitrary thickness and rigidity, evidenced by scanning electron microscope (SEM) and atomic force microscope (AFM) images, Raman spectra, and various electrical characterizations. We also performed a theoretical multiscale simulation from continuum to atomic level to compare the mechanical stresses caused by the R2R and the hot-pressing methods, which also supports our conclusion. Consequently, we believe that the proposed hot-pressing method will be immediately useful for display and solar cell applications that currently require rigid and large substrates. PMID:22631604

Kang, Junmo; Hwang, Soonhwi; Kim, Jae Hwan; Kim, Min Hyeok; Ryu, Jaechul; Seo, Sang Jae; Hong, Byung Hee; Kim, Moon Ki; Choi, Jae-Boong

2012-06-26

239

New model of angular momentum transfer from the rotating central body of a two-body system into the orbital motion of this system (with application to the earth-moon system)  

Microsoft Academic Search

In a previous paper we treated within the framework of our Projective Unified\\u000aField Theory (Schmutzer 2004, Schmutzer 2005a) the 2-body system (e.g.\\u000aearth-moon system) with a rotating central body in a rather abstract manner.\\u000aHere a concrete model of the transfer of angular momentum from the rotating\\u000acentral body to the orbital motion of the whole 2-body system is

E. Schmutzer; Friedrich Schiller

2005-01-01

240

Angular momentum  

NASA Astrophysics Data System (ADS)

The gyroscope in a smartphone was employed in a physics laboratory setting to verify the conservation of angular momentum and the nonconservation of rotational kinetic energy. As is well-known, smartphones are ubiquitous on college campuses. These devices have a panoply of built-in sensors. This creates a unique opportunity for a new paradigm in the physics laboratory.1-3 Many traditional physics experiments can now be performed very conveniently in a pedagogically enlightening environment while simultaneously reducing the laboratory budget substantially by using student-owned smartphones.

Shakur, Asif; Sinatra, Taylor

2013-12-01

241

Effects of a Large Magnetic Field on Energy Transfer in White Dwarf Stars.  

National Technical Information Service (NTIS)

The thesis is concerned with possible effects of a large magnetic field (in the range of approximately 100,000 to approximately 10 to the 13th power gauss) on the transfer of thermal energy out of a white dwarf star. It is shown that a field at the surfac...

J. D. Landstreet

1965-01-01

242

The Production, Transfer and Spillover of Technology: Comparing Large and Small Multinationals as Technology Producers  

Microsoft Academic Search

Multinational enterprises are, sina qua non, the world's technology producers. In this paper, we explore the concept of technology production by multinationals, focusing on three aspects: (i) technology as a firm-specific advantage, (ii) the costs of technology transfer, and (iii) technology spillovers. In each case, we outline current views and debates in the field about the role played by large

Lorraine Eden; Edward Levitas; Richard J. Martinez

1997-01-01

243

Solar electric propulsion for the orbital transfer of large spacecraft to geosynchronous orbit  

Microsoft Academic Search

Low thrust trajectories utilizing electric propulsion and photovoltaic power sources are derived for the transfer of a large spacecraft from assembly in low earth orbit to operation at geosynchronous orbit. Conventional silicon photovoltaic devices are assumed. A 1 MeV equivalent electron flux model is used. The solar panel mass and size are taken from Advanced Photovoltaic Solar Array design concepts

James L. Garrison

1992-01-01

244

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

245

An experimental study of heat transfer in a large-scale turbine rotor passage  

NASA Technical Reports Server (NTRS)

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil as well as for the hub endwall surface. The objective of this program was to document the effects of flow three-dimensionality on the heat transfer in a rotating blade row (vs a stationary cascade). Of particular interest were the effects of the hub and tip secondary flows, tip leakage and the leading-edge horseshoe vortex system. The effect of surface roughness on the passage heat transfer was also investigated. Midspan results are compared with both smooth-wall and rough-wall finite-difference two-dimensional heat transfer predictions. Contour maps of Stanton number for both the rotor airfoil and endwall surfaces revealed numerous regions of high heat transfer produced by the three-dimensional flows within the rotor passage. Of particular importance are regions of local enhancement (as much as 100 percent over midspan values) produced on the airfoil suction surface by the secondary flows and tip-leakage vortices and on the hub endwall by the leading-edge horseshoe vortex system.

Blair, Michael F.

1992-01-01

246

An experimental study of heat transfer in a large-scale turbine rotor passage  

NASA Astrophysics Data System (ADS)

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil as well as for the hub endwall surface. The objective of this program was to document the effects of flow three-dimensionality on the heat transfer in a rotating blade row (vs a stationary cascade). Of particular interest were the effects of the hub and tip secondary flows, tip leakage and the leading-edge horseshoe vortex system. The effect of surface roughness on the passage heat transfer was also investigated. Midspan results are compared with both smooth-wall and rough-wall finite-difference two-dimensional heat transfer predictions. Contour maps of Stanton number for both the rotor airfoil and endwall surfaces revealed numerous regions of high heat transfer produced by the three-dimensional flows within the rotor passage. Of particular importance are regions of local enhancement (as much as 100 percent over midspan values) produced on the airfoil suction surface by the secondary flows and tip-leakage vortices and on the hub endwall by the leading-edge horseshoe vortex system.

Blair, Michael F.

1992-06-01

247

An experimental study of heat transfer in a large-scale turbine rotor passage  

SciTech Connect

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil and for the hub endwall surface. The objective of this program was to document the effects of flow three dimensionality on the heat transfer in a rotating blade row (versus a stationary cascade). Of particular interest were the effects of the hub and tip secondary flows, tip leakage, and the leading-edge horseshoe vortex system. The effect of surface roughness on the passage heat transfer was also investigated. Midspan results are compared with both smooth-wall and rough-wall finite-difference two-dimensional heat transfer predictions. Contour maps of Stanton number for both the rotor airfoil and endwall surfaces revealed numerous regions of high heat transfer produced by the three-dimensional flows within the rotor passage. Of particular importance are regions of local enhancement (as much as 100 percent over midspan values) produced on the airfoil suction surface by the secondary flows and tip-leakage vortices an on the hub endwall by the leading-edge horseshoe vortex system.

Blair, M.F. (United Technologies Research Center, East Hartford, CT (United States))

1994-01-01

248

Blob-induced toroidal momentum transport in simple magnetized plasmas  

SciTech Connect

The link between toroidal flows and density blobs is experimentally demonstrated in TORPEX simple magnetized plasmas: momentum is transferred from an ideal-interchange mode to density blobs. The phase shift between the toroidal flow and the density perturbations observed in the interchange mode where the blob is born is conserved along the blob radial trajectory. This leads to dipolar structures of the blob-induced flow or to monopolar perturbations, so large that the toroidal flow gets transiently reversed. The turbulent toroidal momentum flux is dominated either by the nonlinear flux or by the convective part but not by the Reynolds stress component.

Labit, B.; Theiler, C.; Fasoli, A.; Furno, I.; Ricci, P. [Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne, Association Euratom-Confederation Helvetique, CH-1015 Lausanne (Switzerland)

2011-03-15

249

Large-area patterning of coinage-metal thin films using decal transfer lithography.  

PubMed

We describe two new procedures that appear to hold significant promise as means for patterning thin-film microstructures of the coinage metals (Cu, Ag, Au). A feature central to both is the modification of their surfaces to promote the adhesive transfer of PDMS thin-film microstructures, a material suitable for use as resist layers in large-area patterning, using Decal Transfer Lithography (DTL). The present work provides a significant extension of the capabilities of DTL patterning, providing general protocols that can be used to transfer decal resists to essentially any substrate surface. The first method involves the functionalization of a surface, specifically those of gold and silver films with a thiol-terminated silane coupling agent, (mercaptopropyl)trimethoxysilane. This self-assembled monolayer, when hydrolyzed to its silanol form, provides a robust adhesion-promoting layer suitable for use in DTL patterning. The second method exploits the surface chemistry provided by the deposition of a nanoscale silicon dioxide thin-film capping layer using e-beam evaporation. This procedure provides an exceptional method for patterning large-area, thin-film microstructures of Cu-one compatible with micrometer-scale design rules-that are essentially defect free. Both surface modification strategies enable high-quality poly(dimethylsiloxane) decal transfers, and as the current work shows, these structures are suitable for large-area micrometer-sized patterning of gold, silver, and copper thin films via both wet-etching and lift-off procedures. PMID:15620303

Childs, William R; Nuzzo, Ralph G

2005-01-01

250

Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at {radical}(s{sub NN})=200 GeV  

SciTech Connect

We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum (p{sub T}) for d+Au collisions at {radical}(s{sub NN})=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 0.5<|y|<1.0 for the p{sub T} range 2.5

Abelev, B. I.; Bielcik, J.; Bielcikova, J.; Caines, H.; Catu, O.; Chikanian, A.; Du, F.; Finch, E.; Harris, J. W.; Heinz, M.; Lamont, M. A. C.; Lin, G.; Majka, R.; Nattrass, C.; Salur, S.; Sandweiss, J.; Smirnov, N.; Witt, R. [Yale University, New Haven, Connecticut 06520 (United States); Adams, J.; Barnby, L. S. [University of Birmingham, Birmingham (United Kingdom)] (and others)

2007-11-15

251

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

SciTech Connect

A search for diphoton events with large missing transverse momentum has been performed using 1.07 fb{sup -1} of proton-proton collision data at {radical}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: {sigma} < (22-129) fb in the context of a generalized model of gauge-mediated supersymmetry breaking (GGM) with a bino-like lightest neutralino, {sigma} < (27-91) fb in the context of a minimal model of gauge-mediated supersymmetry breaking (SPS8), and {sigma} < (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 {Lambda} and on the UED compactification scale 1/R, respectively. These limits provide the most stringent tests of these models to date.

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.; et al.

2012-04-20

252

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.

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.; Buchanan, N. J.; Buchholz, P.

2012-04-01

253

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

254

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

255

Centrality Dependence of Charged Particle Production at Large Transverse Momentum in Pb--Pb Collisions at $\\\\sqrt{s_{\\\\rm{NN}}} = 2.76$ TeV  

Microsoft Academic Search

The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |$\\\\eta$| < 0.8 as a function of event centrality in Pb–Pb collisions at $\\\\sqrt{s_{NN}}$ = 2.76 TeV with ALICE at the LHC. The data are presented in the transverse momentum range 0.15 < pT < 50 GeV\\/c for nine centrality intervals from 70–80% to

Betty Abelev; Jaroslav Adam; Dagmar Adamova; Andrew Marshall Adare; Madan Aggarwal; Gianluca Aglieri Rinella; Andras Gabor Agocs; Andrea Agostinelli; Saul Aguilar Salazar; Zubayer Ahammed; Nazeer Ahmad; Arshad Ahmad; Sul-Ah Ahn; Sang Un Ahn; Alexander Akindinov; Dmitry Aleksandrov; Bruno Alessandro; Jose Ruben Alfaro Molina; Andrea Alici; Anton Alkin; Erick Jonathan Almaraz Avina; Johan Alme; Torsten Alt; Valerio Altini; Sedat Altinpinar; Igor Altsybeev; Cristian Andrei; Anton Andronic; Venelin Anguelov; Jonas Anielski; Christopher Daniel Anson; Tome Anticic; Federico Antinori; Pietro Antonioli; Laurent Bernard Aphecetche; Harald Appelshauser; Nicolas Arbor; Silvia Arcelli; Andreas Arend; Nestor Armesto; Roberta Arnaldi; Tomas Robert Aronsson; Ionut Cristian Arsene; Mesut Arslandok; Andzhey Asryan; Andre Augustinus; Ralf Peter Averbeck; Terry Awes; Juha Heikki Aysto; Mohd Danish Azmi; Matthias Jakob Bach; Angela Badala; Yong Wook Baek; Raphaelle Marie Bailhache; Renu Bala; Rinaldo Baldini Ferroli; Alberto Baldisseri; Alain Baldit; Fernando Baltasar Dos Santos Pedrosa; Jaroslav Ban; Rama Chandra Baral; Roberto Barbera; Francesco Barile; Gergely Gabor Barnafoldi; Lee Stuart Barnby; Valerie Barret; Jerzy Gustaw Bartke; Maurizio Basile; Nicole Bastid; Sumit Basu; Bastian Bathen; Guillaume Batigne; Boris Batyunya; Christoph Heinrich Baumann; Ian Gardner Bearden; Hans Beck; Nirbhay Kumar Behera; Iouri Belikov; Francesca Bellini; Rene Bellwied; Ernesto Belmont-Moreno; Gyula Bencedi; Stefania Beole; Ionela Berceanu; Alexandru Bercuci; Yaroslav Berdnikov; Daniel Berenyi; Anais Annick Erica Bergognon; Dario Berzano; Latchezar Betev; Anju Bhasin; Ashok Kumar Bhati; Jihyun Bhom; Livio Bianchi; Nicola Bianchi; Chiara Bianchin; Jaroslav Bielcik; Jana Bielcikova; Ante Bilandzic; Sandro Bjelogrlic; F Blanco; Dmitry Blau; Christoph Blume; Marco Boccioli; Nicolas Bock; Stefan Boettger; Alexey Bogdanov; Hans Boggild; Mikhail Bogolyubsky; Laszlo Boldizsar; Marek Bombara; Herve Borel; Alexander Borissov; Suvendu Nath Bose; Francesco Bossu; Michiel Botje; Elena Botta; Bruno Alexandre Boyer; Ermes Braidot; Peter Braun-Munzinger; Marco Bregant; Timo Gunther Breitner; Tyler Allen Browning; Michal Broz; Rene Brun; Elena Bruna; Giuseppe Eugenio Bruno; Dmitry Budnikov; Henner Buesching; Stefania Bufalino; Oliver Busch; Edith Zinhle Buthelezi; Diego Caballero Orduna; Davide Caffarri; Xu Cai; Helen Louise Caines; Ernesto Calvo Villar; Paolo Camerini; Veronica Canoa Roman; Giovanni Cara Romeo; Francesco Carena; Wisla Carena; Nelson Carlin Filho; Federico Carminati; Amaya Ofelia Casanova Diaz; Javier Ernesto Castillo Castellanos; Juan Francisco Castillo Hernandez; Ester Anna Rita Casula; Vasile Catanescu; Costanza Cavicchioli; Cesar Ceballos Sanchez; Jan Cepila; Piergiorgio Cerello; Beomsu Chang; Sylvain Chapeland; Jean-Luc Fernand Charvet; Subhasis Chattopadhyay; Sukalyan Chattopadhyay; Isha Chawla; Michael Gerard Cherney; Cvetan Cheshkov; Brigitte Cheynis; Vasco Miguel Chibante Barroso; David Chinellato; Peter Chochula; Marek Chojnacki; Subikash Choudhury; Panagiotis Christakoglou; Christian Holm Christensen; Peter Christiansen; Tatsuya Chujo; Suh-Urk Chung; Corrado Cicalo; Luisa Cifarelli; Federico Cindolo; Jean Willy Andre Cleymans; Fabrizio Coccetti; Fabio Colamaria; Domenico Colella; Gustavo Conesa Balbastre; Zaida Conesa del Valle; Paul Constantin; Giacomo Contin; Jesus Guillermo Contreras; Thomas Michael Cormier; Yasser Corrales Morales; Pietro Cortese; Ismael Cortes Maldonado; Mauro Rogerio Cosentino; Filippo Costa; Manuel Enrique Cotallo; Elisabetta Crescio; Philippe Crochet; Emilia Cruz Alaniz; Eleazar Cuautle; Leticia Cunqueiro; Andrea Dainese; Hans Hjersing Dalsgaard; Andrea Danu; Debasish Das; Indranil Das; Kushal Das; Ajay Kumar Dash; Sadhana Dash; Sudipan De; Gabriel de Barros; Annalisa De Caro; Giacinto de Cataldo; Jan de Cuveland; Alessandro De Falco; Daniele De Gruttola; Hugues Delagrange; Andrzej Deloff; Vyacheslav Demanov; Nora De Marco; Ervin Denes; Salvatore De Pasquale; Airton Deppman; Ginevra D'Erasmo; Raoul Stefan de Rooij; Miguel Angel Diaz Corchero; Domenico Di Bari; Thomas Dietel; Carmelo Di Giglio; Sergio Di Liberto; Antonio Di Mauro; Pasquale Di Nezza; Roberto Divia; Oeystein Djuvsland; Alexandru Florin Dobrin; Tadeusz Antoni Dobrowolski; Isabel Dominguez; Benjamin Donigus; Olja Dordic; Olga Driga; Anand Kumar Dubey; Andrea Dubla; Laurent Ducroux; Pascal Dupieux; Mihir Ranjan Dutta Majumdar; AK Dutta Majumdar; Domenico Elia; David Philip Emschermann; Heiko Engel; Barbara Erazmus; Hege Austrheim Erdal

2012-01-01

256

Large-eddy simulation of heat transfer downstream of a backward-facing step  

NASA Astrophysics Data System (ADS)

Large-eddy simulation is used to predict heat transfer in the separated and reattached flow regions downstream of a backward-facing step. Simulations were carried out at a Reynolds number of 28 000 (based on the step height and the upstream centreline velocity) with a channel expansion ratio of 1.25. The Prandtl number was 0.71. Two subgrid-scale models were tested, namely the dynamic eddy-viscosity, eddy-diffusivity model and the dynamic mixed model. Both models showed good overall agreement with available experimental data. The simulations indicated that the peak in heat-transfer coefficient occurs slightly upstream of the mean reattachment location, in agreement with experimental data. The results of these simulations have been analysed to discover the mechanisms that cause this phenomenon. The peak in heat-transfer coefficient shows a direct correlation with the peak in wall shear-stress fluctuations. It is conjectured that the peak in these fluctuations is caused by an impingement mechanism, in which large eddies, originating in the shear layer, impact the wall just upstream of the mean reattachment location. These eddies cause a 'downwash', which increases the local heat-transfer coefficient by bringing cold fluid from above the shear layer towards the wall.

Keating, A.; Piomelli, U.; Bremhorst, K.; Neši?, S.

2004-05-01

257

CHAPARRAL: A library for solving large enclosure radiation heat transfer problems  

SciTech Connect

Large, three-dimensional enclosure radiation beat transfer problems place a heavy demand on computing resources such as computational cycles, memory requirements, disk I/O, and disk space usage. This is primarily due to the computational and memory requirements associated with the view factor calculation and subsequent access of the view factor matrix during solution of the radiosity matrix equation. This is a fundamental problem that constrains Sandia`s current modeling capabilities. Reducing the computational and memory requirements for calculating and manipulating view factors would enable an analyst to increase the level of detail at which a body could be modeled and would have a major impact on many programs at Sandia such as weapon and transportation safety programs, component survivability programs, energy programs, and material processing programs. CHAPARRAL is a library package written to address these problems and is specifically tailored towards the efficient solution of extremely large three-dimensional enclosure radiation heat transfer problems.

Glass, M.W.

1995-08-01

258

Cryogenic voltage withstand and heat transfer tests for the General Electric large coil turn heaters  

Microsoft Academic Search

In order to assess the stability of the various Large Coil Program concepts, each of the three U.S.-made coils incorporates heaters to create a normal zone in the conductor. Based on results of finite-element heat transfer calculations, voltages in the neighborhood of 1 kV are needed to supply the required power over a half-turn. By comparing the results with room-temperature

S. W. Schwenterly; C. M. Fitzpatrick; W. R. Court

1981-01-01

259

Molecular Weight-Dependent Lymphatic Transfer of Exogenous Macromolecules from Large Intestine of Renal Insufficiency Rats  

Microsoft Academic Search

To study the lymphatic delivery of exogenous macromolecules via the enteral route in renal insufficiency, we determined the transfer selectivity to the systemic blood and lymph of fluorescein isothiocyanate-labeled dextrans of different average molecular weight (10, 18, 39, and 69kD). The compounds were administered into the large intestinal lumen of rats with occluded renal circulation, with the aid of lipid-surfactant

Hiroshi Yoshikawa; Kanji Takada; Shozo Muranishi

1992-01-01

260

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

261

Micro- and nanoscale electrical characterization of large-area graphene transferred to functional substrates  

PubMed Central

Summary Chemical vapour deposition (CVD) on catalytic metals is one of main approaches for high-quality graphene growth over large areas. However, a subsequent transfer step to an insulating substrate is required in order to use the graphene for electronic applications. This step can severely affect both the structural integrity and the electronic properties of the graphene membrane. In this paper, we investigated the morphological and electrical properties of CVD graphene transferred onto SiO2 and on a polymeric substrate (poly(ethylene-2,6-naphthalene dicarboxylate), briefly PEN), suitable for microelectronics and flexible electronics applications, respectively. The electrical properties (sheet resistance, mobility, carrier density) of the transferred graphene as well as the specific contact resistance of metal contacts onto graphene were investigated by using properly designed test patterns. While a sheet resistance R sh ? 1.7 k?/sq and a specific contact resistance ?c ? 15 k?·?m have been measured for graphene transferred onto SiO2, about 2.3× higher R sh and about 8× higher ?c values were obtained for graphene on PEN. High-resolution current mapping by torsion resonant conductive atomic force microscopy (TRCAFM) provided an insight into the nanoscale mechanisms responsible for the very high ?c in the case of graphene on PEN, showing a ca. 10× smaller “effective” area for current injection than in the case of graphene on SiO2.

Fisichella, Gabriele; Di Franco, Salvatore; Fiorenza, Patrick; Lo Nigro, Raffaella; Roccaforte, Fabrizio; Tudisco, Cristina; Condorelli, Guido G; Piluso, Nicolo; Sparta, Noemi; Lo Verso, Stella; Accardi, Corrado; Tringali, Cristina; Ravesi, Sebastiano

2013-01-01

262

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

SciTech Connect

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{sup -1} of pp collision data at {radical}s = 7 TeV 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 {ge}6 to {ge}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{sub 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.

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdelalim, Ahmed Ali; Abdinov, Ovsat; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; /SUNY, Albany /Alberta U. /Ankara U. /Dumlupinar U. /Gazi U. /TOBB ETU, Ankara /TAEK, Ankara /Annecy, LAPP /Argonne /Arizona U. /Texas U., Arlington

2012-06-01

263

Large momentum-dependence of the main dispersion ‘kink’ in the high-Tc superconductor Bi2Sr2CaCu2O8+?  

NASA Astrophysics Data System (ADS)

Ultrahigh resolution angle-resolved photoemission spectroscopy with low-energy photons is used to study the detailed momentum dependence of the well-known nodal ‘kink’ dispersion anomaly of Bi2Sr2CaCu2O8+?. We find that the kink's location transitions smoothly from a maximum binding energy of about 65 meV at the node of the d-wave superconducting gap to 55 meV roughly one-third of the way to the antinode. Meanwhile, the self-energy spectrum corresponding to the kink dramatically sharpens and intensifies beyond a critical point in momentum space. We discuss the possible bosonic spectrum in energy and momentum space that can couple to the k-space dispersion of the electronic kinks.

Plumb, N. C.; Reber, T. J.; Iwasawa, H.; Cao, Y.; Arita, M.; Shimada, K.; Namatame, H.; Taniguchi, M.; Yoshida, Y.; Eisaki, H.; Aiura, Y.; Dessau, D. S.

2013-11-01

264

Condensation by DNA looping facilitates transfer of large DNA molecules into mammalian cells  

PubMed Central

Experimental studies of complete mammalian genes and other genetic domains are impeded by the difficulty of introducing large DNA molecules into cells in culture. Previously we have shown that GST–Z2, a protein that contains three zinc fingers and a proline-rich multimerization domain from the polydactyl zinc finger protein RIP60 fused to glutathione S-transferase (GST), mediates DNA binding and looping in vitro. Atomic force microscopy showed that GST–Z2 is able to condense 130–150 kb bacterial artificial chromosomes (BACs) into protein–DNA complexes containing multiple DNA loops. Condensation of the DNA loops onto the Z2 protein–BAC DNA core complexes with cationic lipid resulted in particles that were readily transferred into multiple cell types in culture. Transfer of total genomic linear DNA containing amplified DHFR genes into DHFR– cells by GST–Z2 resulted in a 10-fold higher transformation rate than calcium phosphate co-precipitation. Chinese hamster ovarian cells transfected with a BAC containing the human TP53 gene locus expressed p53, showing native promoter elements are active after GST–Z2-mediated gene transfer. Because DNA condensation by GST–Z2 does not require the introduction of specific recognition sequences into the DNA substrate, condensation by the Z2 domain of RIP60 may be used in conjunction with a variety of other agents to provide a flexible and efficient non-viral platform for the delivery of large genes into mammalian cells.

Montigny, William J.; Houchens, Christopher R.; Illenye, Sharon; Gilbert, Jonathan; Coonrod, Emily; Chang, Young-Chae; Heintz, Nicholas H.

2001-01-01

265

The Charge Form Factor of the Neutron at Low Momentum Transfer from the $^{2}\\\\vec{\\\\rm H}(\\\\vec{\\\\rm e},{\\\\rm e}'{\\\\rm n}){\\\\rm p}$ Reaction  

Microsoft Academic Search

We report new measurements of the neutron charge form factor at low momentum\\u000atransfer using quasielastic electrodisintegration of the deuteron.\\u000aLongitudinally polarized electrons at an energy of 850 MeV were scattered from\\u000aan isotopically pure, highly polarized deuterium gas target. The scattered\\u000aelectrons and coincident neutrons were measured by the Bates Large Acceptance\\u000aSpectrometer Toroid (BLAST) detector. The neutron form

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

2008-01-01

266

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

267

Evolution of 4. pi. observables in the Vlasov-Uehling-Uhlenbeck theory and the transverse momentum transfer as a barometer for hadronic matter  

SciTech Connect

We study the dynamics of high energy heavy ion collisions through the Vlasov-Uehling-Uhlenbeck approach. Equilibration is observed, for central collisions. It is shown that the produced entropy, the pion multiplicity, flow angle, and transverse momentum distributions saturate at the moment of maximum compression and temperature. The effects of the nuclear equation of state and the Pauli principle are investigated. For the flow angle distribution there is a 20 deg reduction of the peak flow angle due to the Pauli principle. A stiff equation of state results in a 10--20 deg increase over the soft equation of state at all energies. The transverse momentum at projectile rapidity exhibits a peak structure as a function of impact parameter b. A 40% difference between soft and hard equation of state is observed for the peak impact parameter, i.e., for intermediate multiplicities.

Molitoris, J.J.; Stoecker, H.; Winer, B.L.

1987-07-01

268

Turbulent heat transfer and large-scale flow in convection cells with aspect ratio ? > 1  

NASA Astrophysics Data System (ADS)

One of the most comprehensively studied turbulent flow is the Rayleigh- Bénard convection, in which a complex three-dimension turbulent motion is initiated by heating the fluid from below and cooling from above. Detailed measurements of the turbulent heat transfer [1, 2], the statistics of the temperature fluctuations and its gradients [3, 4] and the analysis of coherent thermal plumes [5, 6] haven been conducted in the past. The variation of the global heat transfer with respect to two of the three dimensionless control parameters-the Rayleigh number Ra and the Prandtl number Pr - in thermal convection was the focus of most of the laboratory experiments and simulations [7]. The dependence of the third control parameter - the aspect ratio, ? = D / H, with D the diameter and H the height of the cell - has been studied much less extensively. Only a few systematic analyses of high- Rayleigh number convection in flat cells with ? > 1 have been conducted [7], although it is relevant in geophysics and astrophysics. Even more surprisingly, an explicit aspect ratio dependence of the heat transfer in turbulent convection is absent in the existing scaling theories. Within the framework of this study, we perform a systematic analysis of the aspect ratio dependence of convective turbulence in cylindrical cells by three-dimensional direct numerical simulation. Our parameter ranges are: Ra = 107 - 109, ? = 0.5 - 12 for fixed Pr = 0.7. Our analysis is focused on the following questions: Does the turbulent heat transfer at fixed Ra depend on ?? Which changes in the the global flow structures are associated with an aspect ratio variation and which fraction of the total kinetic energy and heat transfer is contained in the large-scale circulation (LSC)? It is found that the global heat transfer, as measured by the Nusselt number Nu, varies up to 10% for aspect ratio variation. It is also observed that the primary mode of the LSC is responsible for carrying almost 50% of the turbulent kinetic energy for ? > 1.

Emran, Mohammad S.; Bailon-Cuba, Jorge; Schumacher, Jörg

269

Absence of suppression in particle production at large transverse momentum in sqrt[s(NN)]=200 GeV d+Au collisions.  

PubMed

Transverse momentum spectra of charged hadrons with p(T)<8 GeV/c and neutral pions with p(T)<10 GeV/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in d+Au collisions at sqrt[s(NN)]=200 GeV. The measured yields are compared to those in p+p collisions at the same sqrt[s(NN)] scaled up by the number of underlying nucleon-nucleon collisions in d+Au. The yield ratio does not show the suppression observed in central Au+Au collisions at RHIC. Instead, there is a small enhancement in the yield of high momentum particles. PMID:12935008

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

2003-08-15

270

Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at (sNN) = 130 GeV  

Microsoft Academic Search

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1 GeV\\/c

K. Adcox; S. S. Adler; N. N. Ajitanand; Y. Akiba; J. Alexander; L. Aphecetche; Y. Arai; S. H. Aronson; R. Averbeck; T. C. Awes; K. N. Barish; P. D. Barnes; J. Barrette; B. Bassalleck; S. Bathe; V. Baublis; A. Bazilevsky; S. Belikov; F. G. Bellaiche; S. T. Belyaev; M. J. Bennett; Y. Berdnikov; S. Botelho; M. L. Brooks; D. S. Brown; N. Bruner; D. Bucher; H. Buesching; V. Bumazhnov; G. Bunce; J. Burward-Hoy; S. Butsyk; T. A. Carey; P. Chand; J. Chang; W. C. Chang; L. L. Chavez; S. Chernichenko; C. Y. Chi; J. Chiba; M. Chiu; R. K. Choudhury; T. Christ; T. Chujo; M. S. Chung; P. Chung; V. Cianciolo; B. A. Cole; D. G. D'Enterria; G. David; H. Delagrange; A. Denisov; A. Deshpande; E. J. Desmond; O. Dietzsch; B. V. Dinesh; A. Drees; A. Durum; D. Dutta; K. Ebisu; Y. V. Efremenko; K. El Chenawi; H. En'yo; S. Esumi; L. Ewell; T. Ferdousi; D. E. Fields; S. L. Fokin; Z. Fraenkel; A. Franz; A. D. Frawley; S.-Y. Fung; S. Garpman; T. K. Ghosh; A. Glenn; A. L. Godoi; Y. Goto; S. V. Greene; M. Grosse Perdekamp; S. K. Gupta; W. Guryn; H.-Å. Gustafsson; J. S. Haggerty; H. Hamagaki; A. G. Hansen; H. Hara; E. P. Hartouni; R. Hayano; N. Hayashi; X. He; T. K. Hemmick; J. M. Heuser; M. Hibino; J. C. Hill; D. S. Ho; K. Homma; B. Hong; A. Hoover; T. Ichihara; K. Imai; M. S. Ippolitov; M. Ishihara; B. V. Jacak; W. Y. Jang; J. Jia; B. M. Johnson; S. C. Johnson; K. S. Joo; S. Kametani; J. H. Kang; M. Kann; S. S. Kapoor; S. Kelly; B. Khachaturov; A. Khanzadeev; J. Kikuchi; D. J. Kim; H. J. Kim; S. Y. Kim; Y. G. Kim; W. W. Kinnison; E. Kistenev; A. Kiyomichi; C. Klein-Boesing; S. Klinksiek; L. Kochenda; V. Kochetkov; D. Koehler; T. Kohama; D. Kotchetkov; A. Kozlov; P. J. Kroon; K. Kurita; M. J. Kweon; Y. Kwon; G. S. Kyle; R. Lacey; J. G. Lajoie; J. Lauret; A. Lebedev; D. M. Lee; M. J. Leitch; X. H. Li; Z. Li; D. J. Lim; M. X. Liu; X. Liu; Z. Liu; C. F. Maguire; J. Mahon; Y. I. Makdisi; V. I. Manko; Y. Mao; S. K. Mark; S. Markacs; G. Martinez; M. D. Marx; A. Masaike; F. Matathias; T. Matsumoto; P. L. McGaughey; E. Melnikov; M. Merschmeyer; F. Messer; M. Messer; Y. Miake; T. E. Miller; A. Milov; S. Mioduszewski; R. E. Mischke; G. C. Mishra; J. T. Mitchell; A. K. Mohanty; J. M. Moss; F. Mühlbacher; M. Muniruzzaman; J. Murata; S. Nagamiya; Y. Nagasaka; J. L. Nagle; Y. Nakada; B. K. Nandi; J. Newby; L. Nikkinen; P. Nilsson; S. Nishimura; A. S. Nyanin; J. Nystrand; E. O'Brien; C. A. Ogilvie; H. Ohnishi; I. D. Ojha; M. Ono; V. Onuchin; A. Oskarsson; L. Österman; I. Otterlund; K. Oyama; L. Paffrath; A. P. Palounek; V. S. Pantuev; V. Papavassiliou; S. F. Pate; T. Peitzmann; A. N. Petridis; C. Pinkenburg; R. P. Pisani; P. Pitukhin; F. Plasil; M. Pollack; K. Pope; M. L. Purschke; I. Ravinovich; K. F. Read; K. Reygers; V. Riabov; Y. Riabov; M. Rosati; A. A. Rose; S. S. Ryu; N. Saito; A. Sakaguchi; T. Sakaguchi; H. Sako; T. Sakuma; V. Samsonov; T. C. Sangster; R. Santo; H. D. Sato; S. Sato; S. Sawada; B. R. Schlei; Y. Schutz; V. Semenov; R. Seto; T. K. Shea; I. Shein; T.-A. Shibata; K. Shigaki; T. Shiina; Y. H. Shin; I. G. Sibiriak; D. Silvermyr; K. S. Sim; J. Simon-Gillo; C. P. Singh; V. Singh; M. Sivertz; A. Soldatov; R. A. Soltz; S. Sorensen; P. W. Stankus; N. Starinsky; P. Steinberg; E. Stenlund; A. Ster; S. P. Stoll; M. Sugioka; T. Sugitate; J. P. Sullivan; Y. Sumi; Z. Sun; M. Suzuki; E. M. Takagui; A. Taketani; M. Tamai; K. H. Tanaka; Y. Tanaka; E. Taniguchi; M. J. Tannenbaum; J. Thomas; T. L. Thomas; W. Tian; J. Tojo; H. Torii; R. S. Towell; I. Tserruya; H. Tsuruoka; A. A. Tsvetkov; S. K. Tuli; H. Tydesjö; N. Tyurin; T. Ushiroda; H. W. van Hecke; C. Velissaris; J. Velkovska; M. Velkovsky; A. A. Vinogradov; M. A. Volkov; A. Vorobyov; E. Vznuzdaev; H. Wang; Y. Watanabe; S. N. White; C. Witzig; F. K. Wohn; C. L. Woody; W. Xie; K. Yagi; S. Yokkaichi; G. R. Young; I. E. Yushmanov; W. A. Zajc; Z. Zhang; S. Zhou

2002-01-01

271

Measurement of the RLT, RL, and RT response functions for the 4He(e,e'p)3H reaction at large missing momentum  

NASA Astrophysics Data System (ADS)

The 4He(e,e'p)3H reaction has been measured at a missing momentum of 265 MeV/c. Data were taken to determine the RL, RT, and RLT response functions. The extracted response functions show substantial differences from a microscopic calculation that includes the plane wave impulse approximation, final state interactions, and meson exchange currents, but agree much better with a calculation that includes orthogonality corrections, short range correlations, and final state interactions.

Epstein, M. B.; Aniol, K. A.; Margaziotis, D. J.; Jiang, B.; Baghaei, H.; Bertozzi, W.; Boeglin, W.; Weinstein, L.; Penn, S.; Morrison, J.; Lourie, R. W.; Finn, J. M.; Perdrisat, C. F.; Punjabi, V.; Ulmer, P. E.; Chang, C. C.; Boberg, P.; Calarco, John; Laget, J. M.

1993-05-01

272

Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb--Pb Collisions at $\\\\sqrt{s_{NN}}$ = 2.76 TeV  

Microsoft Academic Search

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\\\\sqrt{s_{NN}}$ = 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 $0.3 < p_T < 20$ GeV\\/$c$

Kenneth Aamodt; Arian Abrahantes Quintana; Dagmar Adamova; Andrew Marshall Adare; Madan Aggarwal; Gianluca Aglieri Rinella; Andras Gabor Agocs; Saul Aguilar Salazar; Zubayer Ahammed; Arshad Ahmad; Nazeer Ahmad; Sang Un Ahn; Alexander Akindinov; Dmitry Aleksandrov; Bruno Alessandro; Jose Ruben Alfaro Molina; Andrea Alici; Anton Alkin; Erick Jonathan Almaraz Avina; Torsten Alt; Valerio Altini; Sedat Altinpinar; Igor Altsybeev; Cristian Andrei; Anton Andronic; Venelin Anguelov; Christopher Daniel Anson; Tome Anticic; Federico Antinori; Pietro Antonioli; Laurent Bernard Aphecetche; Harald Appelshauser; Nicolas Arbor; Silvia Arcelli; Andreas Arend; Nestor Armesto; Roberta Arnaldi; Tomas Robert Aronsson; Ionut Cristian Arsene; Andzhey Asryan; Andre Augustinus; Ralf Peter Averbeck; Terry Awes; Juha Heikki Aysto; Mohd Danish Azmi; Matthias Jakob Bach; Angela Badala; Yong Wook Baek; Raphaelle Marie Bailhache; Renu Bala; Rinaldo Baldini Ferroli; Alberto Baldisseri; Alain Baldit; Jaroslav Ban; Roberto Barbera; Francesco Barile; Gergely Gabor Barnafoldi; Lee Stuart Barnby; Valerie Barret; Jerzy Gustaw Bartke; Maurizio Basile; Nicole Bastid; Bastian Bathen; Guillaume Batigne; Boris Batyunya; Christoph Heinrich Baumann; Ian Gardner Bearden; Hans Beck; Iouri Belikov; Francesca Bellini; Rene Bellwied; Ernesto Belmont-Moreno; Stefania Beole; Ionela Berceanu; Alexandru Bercuci; Eleni Berdermann; Yaroslav Berdnikov; Latchezar Betev; Anju Bhasin; Ashok Kumar Bhati; Livio Bianchi; Nicola Bianchi; Chiara Bianchin; Jaroslav Bielcik; Jana Bielcikova; Ante Bilandzic; Emanuele Biolcati; Aurelien Joseph Blanc; F Blanco; Dmitry Blau; Christoph Blume; Marco Boccioli; Nicolas Bock; Alexey Bogdanov; Hans Boggild; Mikhail Bogolyubsky; Laszlo Boldizsar; Marek Bombara; Carlo Bombonati; Herve Borel; Claudio Bortolin; Suvendu Nath Bose; Francesco Bossu; Michiel Botje; Stefan Bottger; Bruno Alexandre Boyer; Peter Braun-Munzinger; Larisa Bravina; Marco Bregant; Timo Gunther Breitner; Michal Broz; Rene Brun; Elena Bruna; Giuseppe Eugenio Bruno; Dmitry Budnikov; Henner Buesching; Oliver Busch; Edith Zinhle Buthelezi; Davide Caffarri; Xu Cai; Helen Louise Caines; Ernesto Calvo Villar; Paolo Camerini; Veronica Canoa Roman; Giovanni Cara Romeo; Francesco Carena; Wisla Carena; Federico Carminati; Amaya Ofelia Casanova Diaz; Michele Caselle; Javier Ernesto Castillo Castellanos; Vasile Catanescu; Costanza Cavicchioli; Piergiorgio Cerello; Beomsu Chang; Sylvain Chapeland; Jean-Luc Fernand Charvet; Sukalyan Chattopadhyay; Subhasis Chattopadhyay; Michael Gerard Cherney; Cvetan Cheshkov; Brigitte Cheynis; Emilio Chiavassa; Vasco Miguel Chibante Barroso; David Chinellato; Peter Chochula; Marek Chojnacki; Panagiotis Christakoglou; Christian Holm Christensen; Peter Christiansen; Tatsuya Chujo; Corrado Cicalo; Luisa Cifarelli; Federico Cindolo; Jean Willy Andre Cleymans; Fabrizio Coccetti; Jean-Pierre Michel Coffin; Gustavo Conesa Balbastre; Zaida Conesa del Valle; Paul Constantin; Giacomo Contin; Jesus Guillermo Contreras; Thomas Michael Cormier; Yasser Corrales Morales; Ismael Cortes Maldonado; Pietro Cortese; Mauro Rogerio Cosentino; Filippo Costa; Manuel Enrique Cotallo; Elisabetta Crescio; Philippe Crochet; Eleazar Cuautle; Leticia Cunqueiro; Ginevra D'Erasmo; Andrea Dainese; Hans Hjersing Dalsgaard; Andrea Danu; Debasish Das; Indranil Das; Ajay Kumar Dash; Sadhana Dash; Sudipan De; Andrea De Azevedo Moregula; Gabriel de Barros; Annalisa De Caro; Giacinto de Cataldo; Jan de Cuveland; Alessandro De Falco; Daniele De Gruttola; Nora De Marco; Salvatore De Pasquale; Raoul Stefan de Rooij; Hugues Delagrange; Ydalia Delgado Mercado; Giuseppe Dellacasa; Andrzej Deloff; Vyacheslav Demanov; Ervin Denes; Airton Deppman; Domenico Di Bari; Carmelo Di Giglio; Sergio Di Liberto; Antonio Di Mauro; Pasquale Di Nezza; Thomas Dietel; Roberto Divia; Oeystein Djuvsland; Alexandru Florin Dobrin; Tadeusz Antoni Dobrowolski; Isabel Dominguez; Benjamin Donigus; Olja Dordic; Olha Dryha; Anand Kumar Dubey; Jimmy Dubuisson; Laurent Ducroux; Pascal Dupieux; AK Dutta Majumdar; Mihir Ranjan Dutta Majumdar; Domenico Elia; David Philip Emschermann; Heiko Engel; Hege Austrheim Erdal; Bruno Espagnon; Magali Danielle Estienne; Shinichi Esumi; David Evans; Sebastien Evrard; Gyulnara Eyyubova; Christian Fabjan; Daniela Fabris; Julien Faivre; Davide Falchieri; Alessandra Fantoni; Markus Fasel; Roger Worsley Fearick; Anatoly Fedunov; Dominik Fehlker; Vladimir Fekete; Daniel Felea; Grigory Feofilov; Arturo Fernandez Tellez; Alessandro Ferretti; Roberta Ferretti; Marcel Figueredo

2010-01-01

273

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

274

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

275

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

SciTech Connect

This paper describes an analysis of the angular distribution of W {yields} e{nu} and W {yields} {mu}{nu} decays, using data from pp collisions at {radical}s = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb{sup -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{sub 0}, f{sub L} and f{sub R} over two ranges of W transverse momentum (p{sub T}{sup W}): 35 < p{sub T}{sup W} < 50 GeV and p{sub T}{sup W} > 50 GeV. Good agreement is found with theoretical predictions. For p{sub T}{sup W} > 50 GeV, the values of f{sub 0} and f{sub L}-f{sub R}, averaged over charge and lepton flavour, are measured to be: f{sub 0} = 0.127 {+-} 0.030 {+-} 0.108 and f{sub L} - f{sub 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.; et al.

2012-05-01

276

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

277

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

278

The Energy Budget at the Earth'S Surface: Comparison of Momentum and Energy Balance Methods of Computing Vertical Transfer within a Crop.  

National Technical Information Service (NTIS)

Measurements of windspeed, air temperature, wet-bulb depression, and net radiation were made at several levels within and above a corn crop. Soil heat flux and incident radiation were also measured. Transfer coefficient distributions were computed separat...

J. L. Wright K. W. Brown

1967-01-01

279

Mass dispersal and angular momentum transfer during collisions between rubble-pile asteroids. II. Effects of initial rotation and spin-down through disruptive collisions  

NASA Astrophysics Data System (ADS)

Expanding on our previous N-body simulation of impacts between initially non-rotating rubble-pile objects [Takeda, T., Ohtsuki, K., 2007. Icarus 189, 256-273], we examine effects of initial rotation of targets on mass dispersal and change of spin rates. Numerical results show that the collisional energy needed to disrupt a rubble-pile object is not sensitive to initial rotation of the target, in most of the parameter range studied in our simulations. We find that initial rotation of targets is slowed down through disruptive impacts for a wide range of parameters. The spin-down is caused by escape of high-velocity ejecta and asymmetric re-accumulation of fragments. When these effects are significant, rotation is slowed down even when the angular momentum added by an impactor is in the same direction as the initial rotation of the target. Spin-down is most efficient when the impact occurs in the equatorial plane of the target, because in this case most of the ejected fragments originate from the equatorial region of the target and a significant amount of angular momentum can be easily removed. In the case of impacts from directions inclined relative to the target's equatorial plane, spin-down still occurs with reduced degree, unless impacts occur onto the pole region from the vertical direction. Our results suggest that such spin-down through disruptive impacts may have played an important role in spin evolution of asteroids through collisions in the gravity-dominated regime.

Takeda, Takaaki; Ohtsuki, Keiji

2009-08-01

280

A New Look into the Effect of Large Drops on Radiative Transfer Process  

NASA Technical Reports Server (NTRS)

Recent studies indicate that a cloudy atmosphere absorbs more solar radiation than any current 1D or 3D radiation model can predict. The excess absorption is not large, perhaps 10-15 W/sq m or less, but any such systematic bias is of concern since radiative transfer models are assumed to be sufficiently accurate for remote sensing applications and climate modeling. The most natural explanation would be that models do not capture real 3D cloud structure and, as a consequence, their photon path lengths are too short. However, extensive calculations, using increasingly realistic 3D cloud structures, failed to produce photon paths long enough to explain the excess absorption. Other possible explanations have also been unsuccessful so, at this point, conventional models seem to offer no solution to this puzzle. The weakest link in conventional models is the way a size distribution of cloud particles is mathematically handled. Basically, real particles are replaced with a single average particle. This "ensemble assumption" assumes that all particle sizes are well represented in any given elementary volume. But the concentration of larger particles can be so low that this assumption is significantly violated. We show how a different mathematical route, using the concept of a cumulative distribution, avoids the ensemble assumption. The cumulative distribution has jumps, or steps, corresponding to the rarer sizes. These jumps result in an additional term, a kind of Green's function, in the solution of the radiative transfer equation. Solving the cloud radiative transfer equation with the measured particle distributions, described in a cumulative rather than an ensemble fashion, may lead to increased cloud absorption of the magnitude observed.

Marshak, Alexander

2003-01-01

281

Large-eddy simulation of daytime heat transfer processes over idealized valleys  

NASA Astrophysics Data System (ADS)

Transport and mixing of heat, moisture and other constituents over mountainous terrain, under weak synoptic forcing, is primarily controlled by the evolution of the mountain boundary layer and in particular the associated thermally-induced flows, the slope and valley winds. Despite the importance of these diurnal mountain winds, there is still some uncertainty regarding their role for exchange processes over complex terrain in general and for the enhanced diurnal temperature amplitudes observed in valleys in particular. This study investigates the daytime heat transfer mechanisms and boundary layer evolution over idealized valleys by means of large-eddy simulations. Two- and three-dimensional topographies are used to evaluate the influence of the along-valley wind and the valley surroundings on the cross-valley circulation and heat transfer processes. To allow for the response of the surface fluxes to the evolving slope flows, the atmosphere is coupled to an interactive land surface and the surface fluxes are computed based on Monin-Obukhov similarity theory. To clarify recent issues of contention, the heat transfer processes and the valley heat budget are analyzed both from a local and bulk perspective. To proceed with the local analysis, the flow field is decomposed into its mean and turbulent component. As documented in previous studies, the mean component consists of the upslope flows, quasi-steady thermals over the mountain ridges, and two compensating circulations, one below and one above the valley capping inversion. The flow decomposition allows to clearly distinguish between the different heating processes, those associated with the mean flow, such as advection-induced cooling by the upslope flows and the warming induced by the compensating subsidence, and those associated with the turbulent motions. The analysis from the bulk perspective confirms that the net effect of the thermally-induced cross-valley circulation is to export heat out of the valley and away from the mountain ridge. The results are robust with regard to the different topographies tested.

Schmidli, J.

2012-12-01

282

Production of prolific microsheep by embryo transfer into large non-prolific sheep.  

PubMed

The Garole is a prolific breed of microsheep that possesses the FecB gene, which increases ovulation rate. The purpose of this study was to compare embryo production by multiple ovulation in seven Garole ewes with that in seven normal size, non-prolific Malpura ewes, and assess the influence of the large body size of Awassi crossbred recipient ewes on the birth-weight of Garole lambs. Oestrus was synchronised with two intramuscular injections of 7.5 mg prostaglandin F(2alpha) administered 10 days apart. The donor ewes were superovulated by the use of pregnant mare serum gonadotrophin and follicle-stimulating hormone. The onset and duration of oestrus were similar in both breeds. The Garole donors had higher total mean (se) ovarian responses (15.6 [3.6] v 9.1 [2.3]), ovulation rate (13.6 [3.1] v 8.4 [2.2]) and produced more transferable embryos (6.0 [3.5] v 4.0 [0.9]) than the Malpura donors, but the differences were not statistically significant. The Garole lambs produced by embryo transfer were on average 57.8 per cent heavier at birth than contemporary Garole lambs produced by natural mating. PMID:17041066

Naqvi, S M K; Joshi, A; Gulyani, R; Kumar, D; Kolte, A P; Kumar, S; Maurya, V P; Saha, S; Mittal, J P; Singh, V K

2006-10-14

283

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

284

Relative antioxidant efficiency of a large series of carotenoids in terms of one electron transfer reactions.  

PubMed

The relative antioxidant efficiency, expressed as electron donating capability, of a large series of carotenoids has been studied using density functional theory. Their reactivity toward nine different radicals has been modeled as well as the electron transfer between pairs of carotenoids, one of which is present as a radical cation. The influence of the solvent polarity has also been studied. Torulene was found to be the most easily oxidized carotenoid, followed by lycopene. This higher reactivity is proposed in the present work for the first time, and the potential implications of such a finding are discussed. Since torulene has not been previously studied, compared to other carotenoids in terms of oxidation potentials, further experimental studies are suggested in order to confirm or reject this prediction. Ionization potential seems to be a magnitude calculable at low computational cost that correctly predicts the relative ease of oxidation in a series of carotenoids. The nuclear reorganization energy associated with electron-transfer reactions has been calculated in a very simple but apparently efficient way that allows computation of free energy barriers and relative rate constants in good agreement with the experimental values. In addition, an additive correction is proposed to include the effect of increasing the size of basis sets on the energies of Car(n) --> Car(n-1)(*+) processes. The general agreement between different calculated magnitudes and the corresponding available experimental data supports the predictions from this work. PMID:17941663

Galano, Annia

2007-11-01

285

{ital Ab initio} quantum chemical calculation of electron transfer matrix elements for large molecules  

SciTech Connect

Using a diabatic state formalism and pseudospectral numerical methods, we have developed an efficient {ital ab initio} quantum chemical approach to the calculation of electron transfer matrix elements for large molecules. The theory is developed at the Hartree{endash}Fock level and validated by comparison with results in the literature for small systems. As an example of the power of the method, we calculate the electronic coupling between two bacteriochlorophyll molecules in various intermolecular geometries. Only a single self-consistent field (SCF) calculation on each of the monomers is needed to generate coupling matrix elements for all of the molecular pairs. The largest calculations performed, utilizing 1778 basis functions, required {approximately}14h on an IBM 390 workstation. This is considerably less cpu time than would be necessitated with a supermolecule adiabatic state calculation and a conventional electronic structure code. {copyright} {ital 1997 American Institute of Physics.}

Zhang, L.Y.; Friesner, R.A. [Department of Chemistry, Columbia University, New York, New York 10027 (United States)] [Department of Chemistry, Columbia University, New York, New York 10027 (United States); Murphy, R.B. [Schroedinger, Inc., Portland, Oregon 97204 (United States)] [Schroedinger, Inc., Portland, Oregon 97204 (United States)

1997-07-01

286

Conjugate heat transfer with Large Eddy Simulation for gas turbine components  

NASA Astrophysics Data System (ADS)

CHT (Conjugate Heat Transfer) is a main design constraint for GT (gas turbines). Most existing CHT tools are developed for chained, steady phenomena. A fully parallel environment for CHT has been developed and applied to two configurations of interest for the design of GT. A reactive Large Eddy Simulations code and a solid conduction solver exchange data via a supervisor. A flame/wall interaction is used to assess the precision and the order of the coupled solutions. A film-cooled turbine vane is then studied. Thermal conduction in the blade implies lower wall temperature than adiabatic results and CHT reproduces the experimental cooling efficiency. To cite this article: F. Duchaine et al., C. R. Mecanique 337 (2009).

Duchaine, Florent; Mendez, Simon; Nicoud, Franck; Corpron, Alban; Moureau, Vincent; Poinsot, Thierry

2009-06-01

287

Heat transfer and horizontally averaged temperature of convection with large viscosity variations  

NASA Technical Reports Server (NTRS)

It is pointed out that the understanding of convection in large-Prandtl-number Boussinesq fluids with uniform properties and contained in simple geometries is virtually complete. Present efforts are typically directed towards relaxing some of the original assumptions by going to lower Prandtl number, more complicated geometries, variable material properties, or introducing new dynamical processes such as the Lorentz forces. A description is given of experiments which are concerned with the effect on convection of relaxing the assumption of a uniform viscosity. The reported experiments were designed to measure both the horizontally averaged temperature as a function of depth and the heat transfer of convection over a range of viscosity variations up to 100,000.

Richter, F. M.; Nataf, H.-C.; Daly, S. F.

1983-01-01

288

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum using sqrt {s} = 7 TeV pp collisions with the ATLAS detector  

NASA Astrophysics Data System (ADS)

Results are presented of a search for any particle(s) decaying to six or more jets in association with missing transverse momentum. The search is performed using 1.34fb-1 of sqrt {s} = 7 TeV proton-proton collisions recorded by the ATLAS detector during 2011. Data-driven techniques are used to determine the backgrounds in kinematic regions that require at least six, seven or eight jets, well beyond the multiplicities required in previous analyses. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of a supersymmetry model (MSUGRA/CMSSM) where they extend previous constraints.

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.; Bella, L. Aperio; 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.; 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, 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.; Harpaz, S. Behar; 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.; Ami, S. Ben; 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.; Kuutmann, E. Bergeaas; 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.; de Renstrom, P. A. Bruckman; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Buanes, T.; Bucci, F.; Buchanan, J.; Buchanan, N. J.; Buchholz, P.

2011-11-01

289

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

290

The Local Helium Compound Transfer Lines for the Large Hadron Collider Cryogenic System  

NASA Astrophysics Data System (ADS)

The cryogenic system for the Large Hadron Collider (LHC) under construction at CERN will include twelve new local helium transfer lines distributed among five LHC points in underground caverns. These lines, being manufactured and installed by industry, will connect the cold boxes of the 4.5-K refrigerators and the 1.8-K refrigeration units to the cryogenic interconnection boxes. The lines have a maximum of 30-m length and may possess either small or large re-distribution units to allow connection to the interface ports. Due to space restrictions the lines may have complex routings and require several elbowed sections. The lines consist of a vacuum jacket, a thermal shield and either three or four helium process pipes. Specific internal and external supporting and compensation systems were designed for each line to allow for thermal contraction of the process pipes (or vacuum jacket, in case of a break in the insulation vacuum) and to minimise the forces applied to the interface equipment. Whenever possible, flexible hoses were used instead of bellows to allow for thermal compensation of the process pipes. If necessary, compensation units were integrated in the vacuum jacket. The thermal design was performed to fulfil the specified heat-load budget. This paper presents the main technical design choices for the lines together with their expected performance.

Parente, C.; Allen, W.; Munday, A.; Wiggins, P.

2006-04-01

291

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

292

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

293

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

294

Suppressed pi(0) production at large transverse momentum in central Au+Au collisions at sqrt[s(NN)]=200 GeV.  

PubMed

Transverse momentum spectra of neutral pions in the range 1

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

2003-08-15

295

Suppression of hadrons with large transverse momentum in central Au+Au collisions at root square[s(NN)] = 130 GeV.  

PubMed

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1 GeV/c

Adcox, K; Adler, S S; Ajitanand, N N; Akiba, Y; Alexander, J; Aphecetche, L; Arai, Y; Aronson, S H; Averbeck, R; Awes, T C; Barish, K N; Barnes, P D; Barrette, J; Bassalleck, B; Bathe, S; Baublis, V; Bazilevsky, A; Belikov, S; Bellaiche, F G; Belyaev, S T; Bennett, M J; Berdnikov, Y; Botelho, S; Brooks, M L; Brown, D S; Bruner, N; Bucher, D; Buesching, H; Bumazhnov, V; Bunce, G; Burward-Hoy, J; Butsyk, S; Carey, T A; Chand, P; Chang, J; Chang, W C; Chavez, L L; Chernichenko, S; Chi, C Y; Chiba, J; Chiu, M; Choudhury, R K; Christ, T; Chujo, T; Chung, M S; Chung, P; Cianciolo, V; Cole, B A; D'Enterria, D G; David, G; Delagrange, H; Denisov, A; Deshpande, A; Desmond, E J; Dietzsch, O; Dinesh, B V; Drees, A; Durum, A; Dutta, D; Ebisu, K; Efremenko, Y V; El Chenawi, K; En'yo, H; Esumi, S; Ewell, L; Ferdousi, T; Fields, D E; Fokin, S L; Fraenkel, Z; Franz, A; Frawley, A D; Fung, S-Y; Garpman, S; Ghosh, T K; Glenn, A; Godoi, A L; Goto, Y; Greene, S V; Grosse Perdekamp, M; Gupta, S K; Guryn, W; Gustafsson, H-A; Haggerty, J S; Hamagaki, H; Hansen, A G; Hara, H; Hartouni, E P; Hayano, R; Hayashi, N; He, X; Hemmick, T K; Heuser, J M; Hibino, M; Hill, J C; Ho, D S; Homma, K; Hong, B; Hoover, A; Ichihara, T; Imai, K; Ippolitov, M S; Ishihara, M; Jacak, B V; Jang, W Y; Jia, J; Johnson, B M; Johnson, S C; Joo, K S; Kametani, S; Kang, J H; Kann, M; Kapoor, S S; Kelly, S; Khachaturov, B; Khanzadeev, A; Kikuchi, J; Kim, D J; Kim, H J; Kim, S Y; Kim, Y G; Kinnison, W W; Kistenev, E; Kiyomichi, A; Klein-Boesing, C; Klinksiek, S; Kochenda, L; Kochetkov, V; Koehler, D; Kohama, T; Kotchetkov, D; Kozlov, A; Kroon, P J; Kurita, K; Kweon, M J; Kwon, Y; Kyle, G S; Lacey, R; Lajoie, J G; Lauret, J; Lebedev, A; Lee, D M; Leitch, M J; Li, X H; Li, Z; Lim, D J; Liu, M X; Liu, X; Liu, Z; Maguire, C F; Mahon, J; Makdisi, Y I; Manko, V I; Mao, Y; Mark, S K; Markacs, S; Martinez, G; Marx, M D; Masaike, A; Matathias, F; Matsumoto, T; McGaughey, P L; Melnikov, E; Merschmeyer, M; Messer, F; Messer, M; Miake, Y; Miller, T E; Milov, A; Mioduszewski, S; Mischke, R E; Mishra, G C; Mitchell, J T; Mohanty, A K; Morrison, D P; Moss, J M; Mühlbacher, F; Muniruzzaman, M; Murata, J; Nagamiya, S; Nagasaka, Y; Nagle, J L; Nakada, Y; Nandi, B K; Newby, J; Nikkinen, L; Nilsson, P; Nishimura, S; Nyanin, A S; Nystrand, J; O'Brien, E; Ogilvie, C A; Ohnishi, H; Ojha, I D; Ono, M; Onuchin, V; Oskarsson, A; Osterman, L; Otterlund, I; Oyama, K; Paffrath, L; Palounek, A P T; Pantuev, V S; Papavassiliou, V; Pate, S F; Peitzmann, T; Petridis, A N; Pinkenburg, C; Pisani, R P; Pitukhin, P; Plasil, F; Pollack, M; Pope, K; Purschke, M L; Ravinovich, I; Read, K F; Reygers, K; Riabov, V; Riabov, Y; Rosati, M; Rose, A A; Ryu, S S; Saito, N; Sakaguchi, A; Sakaguchi, T; Sako, H; Sakuma, T; Samsonov, V; Sangster, T C; Santo, R; Sato, H D; Sato, S; Sawada, S; Schlei, B R; Schutz, Y; Semenov, V; Seto, R; Shea, T K; Shein, I; Shibata, T-A; Shigaki, K; Shiina, T; Shin, Y H; Sibiriak, I G; Silvermyr, D; Sim, K S; Simon-Gillo, J; Singh, C P; Singh, V; Sivertz, M; Soldatov, A; Soltz, R A; Sorensen, S; Stankus, P W; Starinsky, N; Steinberg, P; Stenlund, E; Ster, A; Stoll, S P; Sugioka, M; Sugitate, T; Sullivan, J P; Sumi, Y; Sun, Z; Suzuki, M; Takagui, E M; Taketani, A; Tamai, M; Tanaka, K H; Tanaka, Y; Taniguchi, E; Tannenbaum, M J; Thomas, J; Thomas, J H; Thomas, T L; Tian, W; Tojo, J; Torii, H; Towell, R S; Tserruya, I; Tsuruoka, H; Tsvetkov, A A; Tuli, S K; Tydesjö, H; Tyurin, N; Ushiroda, T; van Hecke, H W; Velissaris, C; Velkovska, J; Velkovsky, M; Vinogradov, A A; Volkov, M A; Vorobyov, A; Vznuzdaev, E; Wang, H; Watanabe, Y; White, S N; Witzig, C; Wohn, F K; Woody, C L; Xie, W; Yagi, K; Yokkaichi, S; Young, G R; Yushmanov, I E; Zajc, W A; Zhang, Z; Zhou, S

2002-01-14

296

Mass transfer between bubbles and the dense phase in a nonuniform fluidized bed at large peclet numbers  

SciTech Connect

It is known that heat and mass transfer between bubbles and the dense phase have a significant influence on transport processes in fluidized beds. Therefore mass transfer between bubbles and the dense phase in fluidized beds has been the subject of a considerable number of theoretical and experimental studies. The purpose of the present work is to construct, on the basis of results published earlier, a mathematical model of mass transfer between a bubble and the dense phase of a fluidized bed, with hydrodynamic interaction between the bubbles taken into account. Resistance to mass transfer both within and outside the region of gas circulation is considered. The problem is solved within the framework of assumptions of the theory of the diffusional boundary layer, i.e., at large Peclet numbers. The results of this investigation can be used in calculations relating to mass transfer in fluidized beds of granular materials.

Chesnokov, Y.G.; Protod'yakonov, I.O.

1983-02-01

297

Performance Impact of Large File Transfer on Web Proxy Caching: A Case Study in a High Bandwidth Campus Network Environment  

Microsoft Academic Search

Since large objects consume substantial resources, web proxy caching incurs a fundamental trade-off between perfor- mance (i.e., hit-ratio and latency) and overhead (i.e., resource us- age), in terms of caching and relaying large objects to users. This paper investigates how and to what extent the current dedicated- server based web proxy caching scheme is affected by large file transfers in

Hyun-Chul Kim; Dongman Lee; Kilnam Chon; Beakcheol Jang; Taekyoung Kwon; Yanghee Choi

2010-01-01

298

Large-eddy simulation of oxygen transfer to organic sediment beds  

NASA Astrophysics Data System (ADS)

We have developed a model for dissolved oxygen (DO) transfer from water to underlying organic sediment beds. The model couples large-eddy simulation (LES) of turbulent transport in the water column, a biogeochemical model for DO transport and consumption in the sediment, and Darcy's Law for the pore water-driven transport. The model highlights the spatial and temporal relationship between the turbulent bursting events, the near-wall transport of DO, and the response of the sediment layer. The numerical results—compared to data from laboratory experiments—stress the importance of analyzing instantaneous transport events (not reproducible in a Reynolds-averaged Navier-Stokes model) to better characterize and model the processes that lead to oxygen depletion in the sediment layer. The model's results are compared against experimental data and the sensitivity to the governing parameters has been tested. As the current velocity increases, the sediment-oxygen demand (SOD) increases more slowly than the friction velocity at the wall, in accordance with classic heat-and-mass transfer laws. The overall SOD is approximately proportional to the bacterial content of the sediment layer. The predicted mean advective flux in the porous medium and across the sediment-water interface is negligible compared to the total dispersive flux, for permeabilities typical of the sediments used in the experiments (10-7 and 10-6 cm2). Higher permeabilities (10-5 cm2) appear to yield results not consistent with experimental data. This computational tool will contribute toward the design of a process-oriented parametrization for the SOD, currently missing in oceanographic applications, that can be easily extended to the transport of other bio-limiting substances.

Scalo, Carlo; Piomelli, Ugo; Boegman, Leon

2012-06-01

299

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

300

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

301

Heat transfer, mass transfer and kinetics study of the vacuum pyrolysis of a large used tire particle  

Microsoft Academic Search

A two-dimensional transient pyrolysis model for a large tire particle has been developed. The model considers both transportation and kinetics phenomena. The high content of volatile matters (VM) and the large size of the tire particle sample make the proposed approach different from other pyrolysis models. One novel contribution is the modelling of the transportation of the pyrolysis products by

J. Yang; P. A. Tanguy; C. Roy

1995-01-01

302

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.

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.; Bruncko, D.; Bruneliere, R.

2012-08-01

303

Glenn-HT/BEM Conjugate Heat Transfer Solver for Large-Scale Turbomachinery Models  

NASA Technical Reports Server (NTRS)

A coupled Boundary Element/Finite Volume Method temperature-forward/flux-hack algorithm is developed for conjugate heat transfer (CHT) applications. A loosely coupled strategy is adopted with each field solution providing boundary conditions for the other in an iteration seeking continuity of temperature and heat flux at the fluid-solid interface. The NASA Glenn Navier-Stokes code Glenn-HT is coupled to a 3-D BEM steady state heat conduction code developed at the University of Central Florida. Results from CHT simulation of a 3-D film-cooled blade section are presented and compared with those computed by a two-temperature approach. Also presented are current developments of an iterative domain decomposition strategy accommodating large numbers of unknowns in the BEM. The blade is artificially sub-sectioned in the span-wise direction, 3-D BEM solutions are obtained in the subdomains, and interface temperatures are averaged symmetrically when the flux is updated while the fluxes are averaged anti-symmetrically to maintain continuity of heat flux when the temperatures are updated. An initial guess for interface temperatures uses a physically-based 1-D conduction argument to provide an effective starting point and significantly reduce iteration. 2-D and 3-D results show the process converges efficiently and offers substantial computational and storage savings. Future developments include a parallel multi-grid implementation of the approach under MPI for computation on PC clusters.

Divo, E.; Steinthorsson, E.; Rodriquez, F.; Kassab, A. J.; Kapat, J. S.; Heidmann, James D. (Technical Monitor)

2003-01-01

304

Antibacterial activity of large-area monolayer graphene film manipulated by charge transfer.  

PubMed

Graphene has attracted increasing attention for potential applications in biotechnology due to its excellent electronic property and biocompatibility. Here we use both Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) to investigate the antibacterial actions of large-area monolayer graphene film on conductor Cu, semiconductor Ge and insulator SiO2. The results show that the graphene films on Cu and Ge can surprisingly inhibit the growth of both bacteria, especially the former. However, the proliferation of both bacteria cannot be significantly restricted by the graphene film on SiO2. The morphology of S. aureus and E. coli on graphene films further confirms that the direct contact of both bacteria with graphene on Cu and Ge can cause membrane damage and destroy membrane integrity, while no evident membrane destruction is induced by graphene on SiO2. From the viewpoint of charge transfer, a plausible mechanism is proposed here to explain this phenomenon. This study may provide new insights for the better understanding of antibacterial actions of graphene film and for the better designing of graphene-based antibiotics or other biomedical applications. PMID:24619247

Li, Jinhua; Wang, Gang; Zhu, Hongqin; Zhang, Miao; Zheng, Xiaohu; Di, Zengfeng; Liu, Xuanyong; Wang, Xi

2014-01-01

305

Large eddy simulation for predicting turbulent heat transfer in gas turbines.  

PubMed

Blade cooling technology will play a critical role in the next generation of propulsion and power generation gas turbines. Accurate prediction of blade metal temperature can avoid the use of excessive compressed bypass air and allow higher turbine inlet temperature, increasing fuel efficiency and decreasing emissions. Large eddy simulation (LES) has been established to predict heat transfer coefficients with good accuracy under various non-canonical flows, but is still limited to relatively simple geometries and low Reynolds numbers. It is envisioned that the projected increase in computational power combined with a drop in price-to-performance ratio will make system-level simulations using LES in complex blade geometries at engine conditions accessible to the design process in the coming one to two decades. In making this possible, two key challenges are addressed in this paper: working with complex intricate blade geometries and simulating high-Reynolds-number (Re) flows. It is proposed to use the immersed boundary method (IBM) combined with LES wall functions. A ribbed duct at Re=20?000 is simulated using the IBM, and a two-pass ribbed duct is simulated at Re=100?000 with and without rotation (rotation number Ro=0.2) using LES with wall functions. The results validate that the IBM is a viable alternative to body-conforming grids and that LES with wall functions reproduces experimental results at a much lower computational cost. PMID:25024418

Tafti, Danesh K; He, Long; Nagendra, K

2014-08-13

306

Massively parallel conjugate heat transfer methods relying on large eddy simulation applied to an aeronautical combustor  

NASA Astrophysics Data System (ADS)

Optimizing gas turbines is a complex multi-physical and multi-component problem that has long been based on expensive experiments. Today, computer simulation can reduce design process costs and is acknowledged as a promising path for optimization. However, performing such computations using high-fidelity methods such as a large eddy simulation (LES) on gas turbines is challenging. Nevertheless, such simulations become accessible for specific components of gas turbines. These stand-alone simulations face a new challenge: to improve the quality of the results, new physics must be introduced. Therefore, an efficient massively parallel coupling methodology is investigated. The flow solver modeling relies on the LES code AVBP which has already been ported on massively parallel architectures. The conduction solver is based on the same data structure and thus shares its scalability. Accurately coupling these solvers while maintaining their scalability is challenging and is the actual objective of this work. To obtain such goals, a methodology is proposed and different key issues to code the coupling are addressed: convergence, stability, parallel geometry mapping, transfers and interpolation. This methodology is then applied to a real burner configuration, hence demonstrating the possibilities and limitations of the solution.

Jaure, S.; Duchaine, F.; Staffelbach, G.; Gicquel, L. Y. M.

2013-01-01

307

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

308

Laser-assisted electron momentum spectroscopy  

NASA Astrophysics Data System (ADS)

We consider theoretically ionization of an atomic target by fast electron impact at large energy and momentum transfer and in the presence of laser radiation. The laser electric-field amplitude is weak compared to the typical field in the target. Two frequency regimes are investigated according to whether the laser frequency is (i) much smaller than or (ii) resonant to the frequency of the transition from the ground to the first excited target state. Fast incident, scattered, and ejected electrons are described using Volkov solutions. The dressing of the bound-electron state by the laser field is accounted for within time-dependent perturbation theory in the case of the low-frequency regime and within the rotating wave approximation in the case of a resonant one. The interaction of the incident electron with the target is treated in the first Born approximation. For atomic hydrogen embedded in a linearly or circularly polarized laser field, we discuss how the polarization-vector orientation influences the momentum-dependent (e,2e) differential cross sections assisted by exchange of few photons between the colliding system and the field. In addition, we inspect the dependence of the cross sections on the dressing of the hydrogen state.

Kouzakov, Konstantin A.; Popov, Yuri V.; Takahashi, Masahiko

2010-08-01

309

Wave angular momentum in nonneutral plasmas  

SciTech Connect

Angular momentum and energy are added (or removed) when exciting a mode, such as a diocotron, Trivelpiece-Gould, or Dubin mode, and we discuss rates at which mode angular momentum and energy are added by applied fields. Excitation of a plasma mode is an effective way to transfer angular momentum and energy to the plasma because it is a resonant process. We relate this to recent experiments on compression and expansion of plasmas using a 'rotating wall' field. We also calculate the torque on a Coulomb crystal which is phase-locked to a 'rotating wall' field and describe phase oscillations and the maximum rate of acceleration which can be achieved.

Gould, Roy W. [California Institute of Technology, Pasadena, California 91125 (United States)

1999-12-10

310

Influence of Convective Momentum Transport on Tropical Waves  

NASA Astrophysics Data System (ADS)

Convective momentum transport (CMT) has been found to play an important role during the Madden-Julian Oscillation (MJO). Influences of CMT on tropical waves are analytically studied in a two-layer model, which captures the first-order baroclinic structure in the vertical. Since CMT is the momentum exchange between the lower and the upper troposphere during convection, the easterly and westerly vertical shears of background zonal winds lead to different CMT influences. Generally, CMT plays more important roles than a damping term to tropical waves. CMT is a critical factor for determining the meridional scale of tropical waves and leads to kinetic energy transfer against the direction of background wind shear in the vertical. CMT can also be favorable for internal instability and induce upscale momentum transfer. Specifically, due to CMT, the meridional scale in the two-layer model is wider than the Rossby radius of deformation (RL, the meridional scale of tropical waves in the classical theory) over the Indo-Pacific warm pool, but narrower than RL from the central to the eastern Pacific Ocean and over the Atlantic Ocean. Such variation is consistent with observations. CMT results in minor modifications to the speeds of Rossby waves, inertial gravity waves, and Kelvin waves. Nevertheless, CMT has significant influences on the mixed Rossby-gravity (MRG) waves, especially over the Indo-Pacific warm pool where the vertical wind shear in easterly. Westward propagating MRG waves with small wavenumber become unstable under the influence of CMT. The phase relation between the convergence and geopotential is no longer in quadrature, which is different from classical MRG waves. As a result, there is a net source of mechanical energy within one period and there is an upscale momentum transfer from the perturbed field to large scale velocities. This theoretical study sheds lights on the relation between CMT and slow variations in the atmosphere, including MJO.

Zhou, L.

2012-12-01

311

Analysis of several hazardous conditions for large transfer and back-dilution sequences in Tank 241-SY-101  

SciTech Connect

The first transfer of 89 kgal of waste and back-dilution of 61 kgal of water in Hanford Tank 241-SY-101 was accomplished December 18--20, 1999. Limits were placed on the transfer and back-dilution volumes because of concerns about potential gas release, crust sinking, and degradation of mixer pump performance. Additional transfers and back-dilutions are being planned that will bring the total to 500 kgal, which should dissolve a large fraction of the solids in the tank and dilute it well beyond the point where significant gas retention can occur. This report provides the technical bases for removing the limits on transfer and back-dilution volume by evaluating the potential consequences of several postulated hazardous conditions in view of the results of the first campaign and results of additional analyses of waste behavior.

CW Stewart; LA Mahoney; WB Barton

2000-01-28

312

The role of Volkov waves in laser-assisted electron momentum spectroscopy  

NASA Astrophysics Data System (ADS)

We analyze theoretically laser-assisted electron-impact ionization of atomic hydrogen at high impact energy and large momentum transfer. Considering linearly polarized laser radiation with frequency ?=10.4 fs and intensity W=4×10 W/cm, we describe the field-dressed hydrogen state within time-dependent perturbation theory. We find that even at such moderate field parameters the laser effects on the incident, scattered, and ejected electrons with energies of 1-2 keV can in a dramatic way influence the dependence of the field-assisted differential cross sections on the recoil proton momentum.

Bulychev, Andrey A.; Kouzakov, Konstantin A.; Popov, Yuri V.

2012-01-01

313

HVDC interrupter experiments for large Magnetic Energy Transfer and Storage (METS) systems  

Microsoft Academic Search

Proposed fusion-test reactors will require energy storage systems of ; hundreds of megajoules with transfer times of the order of one millisecond. The ; size of the energy storage submodule (and hence, the overall system cost and ; complexity) is directly determined by the voltage and current limits of the ; switch used for the energy transfer. Experiments are being

C. E. Swannack; R. A. Haarman; J. D. G. Lindsay; D. M. Weldon

1975-01-01

314

Large-eddy simulation of fluid flow and heat transfer in a mixing tee junction  

NASA Astrophysics Data System (ADS)

The temperature fluctuation caused by thermal striping phenomena of hot and cold fluids mixing results in cyclical thermal stress fatigue failure of the pipe wall. Mean temperature difference between hot and cold fluids was often used as thermal load in previous analysis of thermal fatigue failure, thereby the influences of the amplitude and frequency of temperature fluctuation on thermal fatigue failure were neglected. Based on the mechanism of flow and heat transfer which induces thermal fatigue, the turbulent mixing of hot and cold water in a tee junction is simulated with FLUENT platform by using the Large-eddy simulation(LES) turbulent flow model with the sub-grid scale(SGS) model of Smagorinsky-Lilly(SL) to capture the amplitude and frequency of temperature fluctuation. In a simulation case, hot water with temperature of 343.48 K and velocity of 0.15 m/s enters the horizontal main duct with the side length of 100 mm, while cold water with temperature of 296.78 K and velocity of 0.3 m/s enters the vertical branch duct with the side length of 50 mm. The numerical results show that the mean and fluctuating temperatures are in good agreement with the previous experimental data, which describes numerical simulation with high reliability and accuracy; the power spectrum density(PSD) on top wall is higher than that on bottom wall(as the frequency less than 1 Hz), while the PSD on bottom wall is relatively higher than that on top wall (as the frequency of 1-10Hz). The temperature fluctuations in full mixing region of the tee junction can be accurately captured by LES and can provide the theoretical basis for the thermal stress and thermal fatigue analyses.

Lu, Tao; Wang, Yongwei; Wang, Kuisheng

2012-11-01

315

Large-scale Identification of Endogenous Secretory Peptides Using Electron Transfer Dissociation Mass Spectrometry*  

PubMed Central

Mass spectrometry-based unbiased analysis of the full complement of secretory peptides is expected to facilitate the identification of unknown biologically active peptides. However, tandem MS sequencing of endogenous peptides in their native form has proven difficult because they show size heterogeneity and contain multiple internal basic residues, the characteristics not found in peptide fragments produced by in vitro digestion. Endogenous peptides remain largely unexplored by electron transfer dissociation (ETD), despite its widespread use in bottom-up proteomics. We used ETD, in comparison to collision induced dissociation (CID), to identify endogenous peptides derived from secretory granules of a human endocrine cell line. For mass accuracy, both MS and tandem MS were analyzed on an Orbitrap. CID and ETD, performed in different LC-MS runs, resulted in the identification of 795 and 569 unique peptides (ranging from 1000 to 15000 Da), respectively, with an overlap of 397. Peptides larger than 3000 Da accounted for 54% in CID and 46% in ETD identifications. Although numerically outperformed by CID, ETD provided more extensive fragmentation, leading to the identification of peptides that are not reached by CID. This advantage was demonstrated in identifying a new antimicrobial peptide from neurosecretory protein VGF (non-acronymic), VGF[554–577]-NH2, or in differentiating nearly isobaric peptides (mass difference less than 2 ppm) that arise from alternatively spliced exons of the gastrin-releasing peptide gene. CID and ETD complemented each other to add to our knowledge of the proteolytic processing sites of proteins implicated in the regulated secretory pathway. An advantage of the use of both fragmentation methods was also noted in localization of phosphorylation sites. These findings point to the utility of ETD mass spectrometry in the global study of endogenous peptides, or peptidomics.

Sasaki, Kazuki; Osaki, Tsukasa; Minamino, Naoto

2013-01-01

316

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

PubMed

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. PMID:7993092

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

1994-11-01

317

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

318

Angular momentum radio  

NASA Astrophysics Data System (ADS)

Wireless communication amounts to encoding information onto physical observables carried by electromagnetic (EM) fields, radiating them into surrounding space, and detecting them remotely by an appropriate sensor connected to an informationdecoding receiver. Each observable is second order in the fields and fulfills a conservation law. In present-day radio only the EM linear momentum observable is fully exploited. A fundamental physical limitation of this observable, which represents the translational degrees of freedom of the charges (typically an oscillating current along a linear antenna) and the fields, is that it is single-mode. This means that a linear-momentum radio communication link comprising one transmitting and one receiving antenna, known as a single-input-single-output (SISO) link, can provide only one transmission channel per frequency (and polarization). In contrast, angular momentum, which represents the rotational degrees of freedom, is multi-mode, allowing an angular-momentum SISO link to accommodate an arbitrary number of independent transmission channels on one and the same frequency (and polarization). We describe the physical properties of EM angular momentum and how they can be exploited, discuss real-world experiments, and outline how the capacity of angular momentum links may be further enhanced by employing multi-port techniques, i.e., the angular momentum counterpart of linear-momentum multiple-input-multiple-output (MIMO).

Thidé, B.; Tamburini, F.; Then, H.; Someda, C. G.; Mari, E.; Parisi, G.; Spinello, F.; Romanato, F.

2014-02-01

319

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

320

A compact magnetic bearing for gimballed momentum wheel  

NASA Technical Reports Server (NTRS)

A three axis controlled magnetic bearing and its application to a momentum wheel are described. The four divided stators provide a momentum wheel with high reliability, low weight, large angular momentum storage capacity, and gimbal control. Those characteristics are desirable for spacecraft attitude control.

Yabu-Uchi, K.; Inoue, M.; Akishita, S.; Murakami, C.; Okamoto, O.

1983-01-01

321

Precision measurement of longitudinal and transverse response functions of quasi-elastic electron scattering in the momentum transfer range 0.55 GeV/c  

NASA Astrophysics Data System (ADS)

Coulomb Sum Rule states that the integration of the longitudinal response of a nucleus over the range of energy excitation dominated by quasi-elastic proton knock-out process should be equal to the total number of protons in the nucleus. The test of Coulomb Sum Rule will shed light on the question of whether or not the properties of nucleon are modified in the nuclear medium. 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 with energies ranging from 0.4 GeV to 4 GeV scattered from 4He, 12C, 56Fe and 208Pb nuclei at four scattering angles (15°, 60°, 90°, 120°) and scattered energies ranging from 0.1 GeV to 4 GeV. The Rosenbluth method with proper coulomb corrections is used to extract the transverse and longitudinal response functions at three-momentum transfers in the range 0.55 GeV/c ? | q? | ? 1.0 GeV/c. The Coulomb Sum Rule is determined in the same | q? | range and compared to predictions. This work is supported by the Department Of Energy through grant DE-FG02-94ER40844.

Yao, Huan

322

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

323

Multiple recent horizontal transfers of a large genomic region in cheese making fungi  

PubMed Central

While the extent and impact of horizontal transfers in prokaryotes are widely acknowledged, their importance to the eukaryotic kingdom is unclear and thought by many to be anecdotal. Here we report multiple recent transfers of a huge genomic island between Penicillium spp. found in the food environment. Sequencing of the two leading filamentous fungi used in cheese making, P. roqueforti and P. camemberti, and comparison with the penicillin producer P. rubens reveals a 575?kb long genomic island in P. roqueforti—called Wallaby—present as identical fragments at non-homologous loci in P. camemberti and P. rubens. Wallaby is detected in Penicillium collections exclusively in strains from food environments. Wallaby encompasses about 250 predicted genes, some of which are probably involved in competition with microorganisms. The occurrence of multiple recent eukaryotic transfers in the food environment provides strong evidence for the importance of this understudied and probably underestimated phenomenon in eukaryotes.

Cheeseman, Kevin; Ropars, Jeanne; Renault, Pierre; Dupont, Joelle; Gouzy, Jerome; Branca, Antoine; Abraham, Anne-Laure; Ceppi, Maurizio; Conseiller, Emmanuel; Debuchy, Robert; Malagnac, Fabienne; Goarin, Anne; Silar, Philippe; Lacoste, Sandrine; Sallet, Erika; Bensimon, Aaron; Giraud, Tatiana; Brygoo, Yves

2014-01-01

324

Studies of Forced-Convection Heat Transfer Augmentation in Large Containment Enclosures  

SciTech Connect

Heat transfer enhancement due to jet mixing inside a cylindrical enclosure is discussed. This work addresses conservative heat transfer assumptions regarding mixing and condensation that have typically been incorporated into passive containment design analyses. This research presents the possibility for increasing decay heat removal of passive containment systems under combined natural and forced convection. Eliminating these conservative assumptions could result in a changed containment design and reduce the construction cost. It is found that the ratio of forced- and free-convection Nusselt numbers can be predicted as a function of the Archimedes number and a correlated factor accounting for jet orientation and enclosure geometry.

Kuhn, S.Z.; Peterson, P.F.

2001-06-17

325

The study of the Z boson transverse momentum spectrum recorded by the Compact Muon Solenoid from 2010 Large Hadron Collider data  

NASA Astrophysics Data System (ADS)

This dissertation describes the full details of 2 studies of Z0 bosons performed using the Compact Muon Solenoid detector at the Large Hadron Collider of proton on proton collisions with center of mass energy of 7TeV. The first study searches for physics beyond the Standard Model by looking for an excess in production of Z0 bosons by examining the Z 0pT spectrum. As no excess is found, limits on new physics models are presented as a function of mass and other free parameters. The second study focuses on a precision measurement of the Z 0pT distribution, and is compared to theoretical calculations for the purposes of testing high order QCD calculations in addition to probing the predictions of various tunes of the underlying event. (Full text of this dissertation may be available via the University of Florida Libraries web site. Please check http://www.uflib.ufl.edu/etd.html)

Gartner, Joseph A., III

326

Lipid transfer particle from the silkworm, Bombyx mori, is a novel member of the apoB/large lipid transfer protein family.  

PubMed

Lipid transfer particle (LTP) is a high-molecular-weight, very high-density lipoprotein known to catalyze the transfer of lipids between a variety of lipoproteins, including both insects and vertebrates. Studying the biosynthesis and regulation pathways of LTP in detail has not been possible due to a lack of information regarding the apoproteins. Here, we sequenced the cDNA and deduced amino acid sequences for three apoproteins of LTP from the silkworm (Bombyx mori). The three subunit proteins of the LTP are coded by two genes, apoLTP-II/I and apoLTP-III. ApoLTP-I and apoLTP-II are predicted to be generated by posttranslational cleavage of the precursor protein, apoLTP-II/I. Clusters of amphipathic secondary structure within apoLTP-II/I are similar to Homo sapiens apolipoprotein B (apoB) and insect lipophorins. The apoLTP-II/I gene is a novel member of the apoB/large lipid transfer protein gene family. ApoLTP-III has a putative conserved juvenile hormone-binding protein superfamily domain. Expression of apoLTP-II/I and apoLTP-III genes was synchronized and both genes were primarily expressed in the fat body at the stage corresponding to increased lipid transport needs. We are now in a position to study in detail the physiological role of LTP and its biosynthesis and assembly. PMID:23812557

Yokoyama, Hiroshi; Yokoyama, Takeru; Yuasa, Masashi; Fujimoto, Hirofumi; Sakudoh, Takashi; Honda, Naoko; Fugo, Hajime; Tsuchida, Kozo

2013-09-01

327

Boundary-Layer Equation-Based Wall Model for Large-Eddy Simulation of Turbulent Flows with Wall Heat Transfer  

Microsoft Academic Search

A new thermal boundary-layer model is developed that alleviates the stringent near-wall grid resolution requirement in large-eddy simulations of turbulent flows with wall heat transfer. The model is based on solving the turbulent temperature boundary-layer equation to determine the temperature profile in the near-wall region. The near-wall temperature profile is used to compute the instantaneous wall heat flux, which replaces

Sarma L. Rani; Clifford E. Smith; Andrew C. Nix

2009-01-01

328

Hvdc Interrupter Experiments for Large Magnetic Energy Transfer and Storage (Mets) Systems.  

National Technical Information Service (NTIS)

Proposed fusion-test reactors will require energy storage systems of hundreds of megajoules with transfer times of the order of one millisecond. The size of the energy storage submodule (and hence, the overall system cost and complexity) is directly deter...

C. E. Swannack R. A. Haarman J. D. G. Lindsay D. M. Weldon

1975-01-01

329

Ice cloud microphysics, radiative transfer and large-scale cloud processes  

Microsoft Academic Search

Summary Parameterization programs for cloud microphyscs and radiative transfer involving ice clouds have been developed in terms of the mean effective size and ice water path. The mean effective size appears to be adequate in representing the ice crystal size distribution for radiative parameterizations. For a given ice water path, smaller mean effective sizes reflect more solar radiation, emit more

K. N. Liou; J. L. Lee; S. C. Ou; Q. Fu; Y. Takano

1991-01-01

330

Tumor-reactive CD4+ T cells develop cytotoxic activity and eradicate large established melanoma after transfer into lymphopenic hosts  

PubMed Central

Adoptive transfer of large numbers of tumor-reactive CD8+ cytotoxic T lymphocytes (CTLs) expanded and differentiated in vitro has shown promising clinical activity against cancer. However, such protocols are complicated by extensive ex vivo manipulations of tumor-reactive cells and have largely focused on CD8+ CTLs, with much less emphasis on the role and contribution of CD4+ T cells. Using a mouse model of advanced melanoma, we found that transfer of small numbers of naive tumor-reactive CD4+ T cells into lymphopenic recipients induces substantial T cell expansion, differentiation, and regression of large established tumors without the need for in vitro manipulation. Surprisingly, CD4+ T cells developed cytotoxic activity, and tumor rejection was dependent on class II–restricted recognition of tumors by tumor-reactive CD4+ T cells. Furthermore, blockade of the coinhibitory receptor CTL-associated antigen 4 (CTLA-4) on the transferred CD4+ T cells resulted in greater expansion of effector T cells, diminished accumulation of tumor-reactive regulatory T cells, and superior antitumor activity capable of inducing regression of spontaneous mouse melanoma. These findings suggest a novel potential therapeutic role for cytotoxic CD4+ T cells and CTLA-4 blockade in cancer immunotherapy, and demonstrate the potential advantages of differentiating tumor-reactive CD4+ cells in vivo over current protocols favoring in vitro expansion and differentiation.

Quezada, Sergio A.; Simpson, Tyler R.; Peggs, Karl S.; Merghoub, Taha; Vider, Jelena; Fan, Xiaozhou; Blasberg, Ronald; Yagita, Hideo; Muranski, Pawel; Antony, Paul A.; Restifo, Nicholas P.

2010-01-01

331

Noise-Immune Conjugate Large-Area Atom Interferometers  

Microsoft Academic Search

We present a pair of simultaneous conjugate Ramsey-Borde atom interferometers (SCI) using large (20\\\\hbar k)-momentum transfer (LMT) beam splitters, where \\\\hbar k is the photon momentum. Simultaneous operation allows for common-mode rejection of vibrational noise. This allows us to surpass the enclosed space-time area of previous interferometers with a splitting of 20\\\\hbar k by a factor of 2,500. Among applications,

Sheng-Wey Chiow; Steven Chu; Holger Mueller

2009-01-01

332

Momentum transfer in indirect explosive drive  

SciTech Connect

Material which is not in direct contact with detonating explosives may still be driven by the explosion through impact by driven material or by attachment to driven material. In such circumstances the assumption of inelastic collision permits estimation of the final velocity of an assemblage. Examples of the utility of this assumption are demonstrated through use of Gurney equations. The inelastic collision calculation may also be used for metal parts which are driven by explosives partially covering the metal. We offer a new discounting angle to account for side energy losses from laterally unconfined explosive charges in cases where the detonation wave travels parallel to the surface which is driven.

Kennedy, J.E.; Warnes, R.H. [Los Alamos National Lab., NM (United States); Cherry, C.R.; Cherry, C.R. Jr.; Fischer, S.H. [Sandia National Labs., Albuquerque, NM (United States)

1996-07-01

333

Deuteron threshold electrodisintegration at high momentum transfer  

NASA Astrophysics Data System (ADS)

Absolute differential cross sections for the threshold electrodisintegration of the deuteron with good resolution were measured at a laboratory scattering angle of 160° for five values of Q2 ranging from 8.66 to 42.4 fm-2. Comparisons of the data averaged over Enp from 0 to 3 MeV and from 0 to10 MeV are made with nonrelativistic meson exchange calculations. These calculations are sensitive to the nucleon electromagnetic form factors, nucleon-nucleon potential, and relativistic effects. The data are also compared with a hybrid quark-hadron model calculation that describes the deuteron as a six-quark cluster for the short range part of the interaction. Some of these calculations can describe the data reasonably well over certain ranges of Q2; however, none of these calculations can accurately describe the data over the entire measured Q2 range.

Schmitt, W. M.; Turchinetz, W.; Williamson, C. F.; Yates, T. C.; Zumbro, J. D.; Lee, K. S.; Baghaei, H.; Churchwell, S.; Hicks, R. S.; Miskimen, R.; Peterson, G. A.; Wang, K.; Bosted, P. E.; Spengos, M.; Frois, B.; Martino, J.; Platchkov, S.; Hotta, A.

1997-10-01

334

Electroproduction of hyperons at low momentum transfer  

Microsoft Academic Search

A high resolution study of the H(e,e'K+)?,? 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 ?0. This reaction was studied using a hydrogen (i.e. a proton) target. Data were taken at

Armando R Acha

2011-01-01

335

Momentum transfers in correlation-assisted tunneling  

NASA Astrophysics Data System (ADS)

We consider correlation-assisted tunnel ionization of a small molecule by an intense low-frequency laser pulse. In this mechanism, the departing electron excites the state of the ion via a Coulomb interaction. We show that the wave packets emerging from this process can have nontrivial spatial structure and give a measurable indicator of correlated multielectron dynamics during the tunneling step. We also show that the saddle-point approximation requires special attention in this geometric analysis.

Pisanty, Emilio; Ivanov, Misha

2014-04-01

336

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

337

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

338

QM Momentum Carpet Program  

NSDL National Science Digital Library

The QM Momentum Carpet program displays the time evolution of the position-space wave function and the associated quantum-mechanical momentum-time diagram, the momentum-space quantum carpet. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the qm_momentun_carpet.jar file will run the program if Java is installed. The default wave function is a Gaussian wave packet in an infinite square well. Additional states and other potential energy functions can be specified using the Display | Switch GUI menu item. QM Momentum Carpet is one of 18 Open Source Physics programs that model time-dependent quantum mechanics using an energy eigenstate expansion. Other programs provide additional visualizations. They can be found by searching ComPADRE for Open Source Physics, OSP, or Superposition.

Christian, Wolfgang

2008-04-17

339

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

340

An Online Scheduling Algorithm with Advance Reservation for Large-Scale Data Transfers  

SciTech Connect

Scientific applications and experimental facilities generate massive data sets that need to be transferred to remote collaborating sites for sharing, processing, and long term storage. In order to support increasingly data-intensive science, next generation research networks have been deployed to provide high-speed on-demand data access between collaborating institutions. In this paper, we present a practical model for online data scheduling in which data movement operations are scheduled in advance for end-to-end high performance transfers. In our model, data scheduler interacts with reservation managers and data transfer nodes in order to reserve available bandwidth to guarantee completion of jobs that are accepted and confirmed to satisfy preferred time constraint given by the user. Our methodology improves current systems by allowing researchers and higher level meta-schedulers to use data placement as a service where theycan plan ahead and reserve the scheduler time in advance for their data movement operations. We have implemented our algorithm and examined possible techniques for incorporation into current reservation frameworks. Performance measurements confirm that the proposed algorithm is efficient and scalable.

Balman, Mehmet; Kosar, Tevfik

2010-05-20

341

Large work function difference driven electron transfer from electrides to single-walled carbon nanotubes.  

PubMed

A difference in work function plays a key role in charge transfer between two materials. Inorganic electrides provide a unique opportunity for electron transfer since interstitial anionic electrons result in a very low work function of 2.4-2.6 eV. Here we investigated charge transfer between two different types of electrides, [Ca2N](+)·e(-) and [Ca24Al28O64](4+)·4e(-), and single-walled carbon nanotubes (SWNTs) with a work function of 4.73-5.05 eV. [Ca2N](+)·e(-) with open 2-dimensional electron layers was more effective in donating electrons to SWNTs than closed cage structured [Ca24Al28O64](4+)·4e(-) due to the higher electron concentration (1.3 × 10(22) cm(-3)) and mobility (?200 cm(2) V(-1) s(-1) at RT). A non-covalent conjugation enhanced near-infrared fluorescence of SWNTs as high as 52%. The field emission current density of electride-SWNT-silver paste dramatically increased by a factor of 46?000 (14.8 mA cm(-2)) at 2 V ?m(-1) (3.5 wt% [Ca2N](+)·e(-)) with a turn-on voltage of 0.85 V ?m(-1). PMID:24956225

Menamparambath, Mini Mol; Park, Jong-Ho; Yoo, Ho-Sung; Patole, Shashikant P; Yoo, Ji-Beom; Kim, Sung Wng; Baik, Seunghyun

2014-07-10

342

Near-field radiative transfer between two unequal sized spheres with large size disparities.  

PubMed

We compute near-field radiative transfer between two spheres of unequal radii R1 and R2 such that R2 ? 40R1. For R2 = 40R1, the smallest gap to which we have been able to compute radiative transfer is d = 0.016R1. To accomplish these computations, we have had to modify existing methods for computing near-field radiative transfer between two spheres in the following ways: (1) exact calculations of coefficients of vector translation theorem are replaced by approximations valid for the limit d ? R1, and (2) recursion relations for a normalized form of translation coefficients are derived which enable us to replace computations of spherical Bessel and Hankel functions by computations of ratios of spherical Bessel or spherical Hankel functions. The results are then compared with the predictions of the modified proximity approximation. PMID:24977544

Sasihithlu, Karthik; Narayanaswamy, Arvind

2014-06-16

343

Momentum distribution in the nucleus. II  

Microsoft Academic Search

We calculate the single particle momentum distribution n(q) for a one-dimensional model with delta forces. There is a domain of q for which n(q) has an exponential falloff, but after allowance is made for the nonsaturation in the model, that domain does not grow significantly with particle number. The relation of this result to large momentum scattering from the nucleus

R. D. Amado; R. M. Woloshyn

1977-01-01

344

Momentum distribution in the nucleus. II  

Microsoft Academic Search

We calculate the single particle momentum distribution n(q) for a one-dimensional model with delta forces. There is a domain of q for which n(q) has an exponential falloff; but, after allowance is made for the nonsaturation in the model, that domain does not grow significantly with particle number. The relation of this result to large momentum scattering from the nucleus

R. D. Amado; R. M. Woloshyn

1977-01-01

345

Microobject manipulation by laser beams with a nonzero orbital momentum  

SciTech Connect

It is shown that the possibilities of manipulating microobjects can be considerably extended by using beams with preset intensity and orbital momentum distributions in the focusing plane. The results of experiments on the transfer of the orbital momentum of such beams to microparticles are presented. (letters)

Volostnikov, Vladimir G; Kotova, S P; Losevskii, N N; Rakhmatulin, M A [Samara Branch of the P.N. Lebedev Physics Institute, Russian Academy of Sciences, Samara (Russian Federation)

2002-07-31

346

Measurement of Momentum Transport in Magnetic Turbulence  

NASA Astrophysics Data System (ADS)

Momentum transport in a hot accretion disk must be much faster than allowed by classical dissipation. The leading candidate for this anomalous transport is the magnetorotational instability (MRI), which produces magnetic turbulence [1]. Anomalous momentum transport is also observed in reversed field pinch (RFP) plasmas. Surprisingly, despite ? a few percent in MST plasmas, parallel pressure fluctuations correlated with magnetic fluctuations can produce momentum flux comparable to the radial momentum transport that occurs in magnetic relaxation events (sawteeth), thereby implying that kinetic effects are important for momentum transport in a turbulent magnetic field. This result was obtained using advanced interferometry and polarimetry techniques in the hot MST plasma core. Previous measurements in MST identified that both the Reynolds and Maxwell fluid stresses are also large (and oppositely directed) during these relaxation events. Thus multiple momentum transport mechanisms appear to be active in the RFP. We note that the parallel Maxwell stress is identically the Hall dynamo; the self-consistent coupling of momentum transport and dynamo has also been considered for accretion disks [2]. Supported by US DOE and NSF. [1] S.A. Balbus, J.F. Hawley, Rev. Mod. Phys., 70, 1 (1998). [2] F. Ebrahimi et al., Phys. Rev. Lett. 99, 075003 (2007).

Ding, W. X.; Brower, D. L.; Bergerson, W. F.; Lin, L.; Almagri, A.; Fiksel, G.; den Hartog, D. J.; Reusch, J. A.; Sarff, J. S.

2010-11-01

347

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

348

Numerical simulation of the hydrodynamics and mass transfer in the large scale, rapid growth of KDP crystals—2: computation of the mass transfer  

NASA Astrophysics Data System (ADS)

Numerical simulations of the hydrodynamics and mass transfer involved in the rapid growth of very large potassium di-hydrogen phosphate (KDP) crystals with linear dimensions up to 60 cm and masses greater than 270 kg have been performed. The computational geometry corresponds very closely to the 1000-l crystallizers currently in use at Lawrence Livermore National Laboratory (LLNL) for the growth of KDP crystals for the National Ignition Facility (NIF). In a related paper (J. Crystal Growth 222 (2000) 263), the temporal and spatial character of the three-dimensional, time-dependent, turbulent flow field was discussed. This paper presents the corresponding results concerning the mass transfer occurring at the crystal surface during the rapid growth process. Emphasis is placed on studying the surface concentration or supersaturation distribution, since it is critically involved in the processes of morphological instability and inclusion formation. The temporal and spatial evolution of the surface supersaturation is studied as a function of crystal size, growth rate, and rotation conditions.

Robey, H. F.

2003-12-01

349

Spectral momentum densities in matter determined by electron scattering.  

PubMed

In electron momentum spectroscopy (EMS), an incoming energetic electron (50 keV in this work) ionizes the target and the scattered and ejected electrons are detected in coincidence (at energies near 25 keV). From the energy and momentum of the detected particles, the energy omega and momentum q transferred to the target can be inferred. The observed intensity distribution I(omega, q) is proportional to the spectral momentum density of the target and hence provides a direct challenge to many-body theoretical descriptions of condensed matter. This is illustrated by comparing some many-body calculations with EMS measurements on graphite and polycrystalline aluminium. PMID:14966321

Weigold, Erich; Kheifets, Anatoli S; Sashin, Vladimir A; Vos, Maarten

2004-03-01

350

Quantitative measurement of orbital angular momentum in electron microscopy  

NASA Astrophysics Data System (ADS)

Electron vortex beams have been predicted to enable atomic scale magnetic information measurement, via transfer of orbital angular momentum. Research so far has focused on developing production techniques and applications of these beams. However, methods to measure the outgoing orbital angular momentum distribution are also a crucial requirement towards this goal. Here, we use a method to obtain the orbital angular momentum decomposition of an electron beam, using a multipinhole interferometer. We demonstrate both its ability to accurately measure orbital angular momentum distribution, and its experimental limitations when used in a transmission electron microscope.

Clark, L.; Béché, A.; Guzzinati, G.; Verbeeck, J.

2014-05-01

351

Large-scale changes of the temperature frontal zones and regional features in heat transfer patterns based on SST data  

NASA Astrophysics Data System (ADS)

The intensity of heat transfer by currents influences on the location of energetically active zones in the ocean In such zones the hydrological parameter gradients increase which reveals the structure of frontal zones SST data isn t enough to determine the location of such zones In our work we calculate according to AVHRR MCSST data the temperature gradients in the ocean that show the large-scale changes of the temperature frontal zones TFZ for the 1982 -- 1986 average monthly and 1990 -- 2001 average weekly periods To study how the temperature frontal zones are connected with the regional heat patterns we use the data concerned with the space-time variability of SST gradients for separate Pacific regions In our case the focus is placed on the investigation of the connection between the formation of the El Ni v n o-Southern Oscillation South-East Pacific and the variability of the heat transfer near the shores of North-West Pacific For the investigation of the main factors influencing on the heat redistribution in the ocean and of the reasons for the large-scale changes in the TFZ structure we use a two-dimensional horizontal numerical model of heat transfer The model takes into consideration the current speed turbulent diffusion and solar radiation Besides the results were obtained concerning heat transformation in several regions of North and South Atlantic which had been caused by the large-scale changes in the TFZ structure The research results and model experiments allow to identify the time scale of the temperature field

Kartushinsky, A.; Shishkin, A.

352

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

353

Large spectral weight transfer in optical conductivity of SrTiO3 induced by intrinsic vacancies  

NASA Astrophysics Data System (ADS)

The optical conductivity (?1) of SrTiO3 for various vacancies has been systematically studied using a combination of ultraviolet-vacuum ultraviolet reflectivity and spectroscopic ellipsometry. For cation (Ti) vacancies, ?1 shows large spectral weight transfer over a wide range of energy from as high as 35 eV to as low as 0.5 eV and the presence of mid-gap states, suggesting that strong correlations play an important role. Meanwhile, for anion (O) vacancies, ?1 shows changes from 7.4 eV up to 35 eV.

Asmara, T. C.; Wang, X.; Santoso, I.; Zhang, Q.; Shirakawa, T.; Qi, D.; Kotlov, A.; Motapothula, M.; Breese, M. H.; Venkatesan, T.; Yunoki, S.; Rübhausen, M.; Ariando, Rusydi, A.

2014-06-01

354

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

355

Confining potential in momentum space  

NASA Technical Reports Server (NTRS)

A method is presented for the solution in momentum space of the bound state problem with a linear potential in r space. The potential is unbounded at large r leading to a singularity at small q. The singularity is integrable, when regulated by exponentially screening the r-space potential, and is removed by a subtraction technique. The limit of zero screening is taken analytically, and the numerical solution of the subtracted integral equation gives eigenvalues and wave functions in good agreement with position space calculations.

Norbury, John W.; Kahana, David E.; Maung, Khin Maung

1992-01-01

356

Losing forward momentum holographically  

NASA Astrophysics Data System (ADS)

We present a numerical scheme for solving Einstein’s Equations in the presence of a negative cosmological constant and an event horizon with planar topology. Our scheme allows for the introduction of a particular metric source at the conformal boundary. Such a spacetime has a dual holographic description in terms of a strongly interacting quantum field theory at nonzero temperature. By introducing a sinusoidal static metric source that breaks translation invariance, we study momentum relaxation in the field theory. In the long wavelength limit, our results are consistent with the fluid-gravity correspondence and relativistic hydrodynamics. In the small amplitude limit, our results are consistent with the memory function prediction for the momentum relaxation rate. Our numerical scheme allows us to study momentum relaxation outside these two limits as well.

Balasubramanian, Koushik; Herzog, Christopher P.

2014-06-01

357

Reaction/Momentum Wheel  

NASA Technical Reports Server (NTRS)

CTA Space Systems, Inc. has been licensed to sell commercially a reaction/momentum wheel originally developed for NASA's scientific satellites. NASA originally identified a need for the wheel in its Small Explorer program. The Submillimeter Wave Astronomy Satellite required extremely low jitter and a reaction/momentum wheel with a torque greater than any comparably sized commercially available wheel to keep the instrument pointed at celestial objects to a high degree of precision. After development, a market assessment by Research Triangle Institute was completed, showing commercial potential for the flywheel technology. A license was granted to CTA in the fall of 1996. The company currently uses the technology in its complete spacecraft fabrication services and has built over 10 reaction/momentum wheels for commercial, scientific, and military customers.

1997-01-01

358

QM Momentum Measurement Program  

NSDL National Science Digital Library

The QM Momentum Measurement program displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurement of momentum. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the qm_measurement_p.jar file will run the program if Java is installed. The default wave function is an equal-mix four-state superposition in the infinite square well. QM Momentum Measurement is one of 18 Open Source Physics programs that model time-dependent quantum mechanics using an energy eigenstate expansion. Other programs provide additional visualizations. They can be found by searching ComPADRE for Open Source Physics, OSP, or Superposition.

Christian, Wolfgang

2008-04-17

359

QM Momentum Space Program  

NSDL National Science Digital Library

The QM Momentum Space program displays the time evolution of the position-space wave function and the associated momentum-space wave function. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the qm_fft.jar file will run the program if Java is installed. The default wave function is a Gaussian wave packet in a harmonic oscillator. Additional states and other potential energy functions can be specified using the Display | Switch GUI menu item. QM Momentum Space is one of 18 Open Source Physics programs that model time-dependent quantum mechanics using an energy eigenstate expansion. Other programs provide additional visualizations. They can be found by searching ComPADRE for Open Source Physics, OSP, or Superposition.

Christian, Wolfgang

2008-04-17

360

Search for new phenomena in tt events with large missing transverse momentum in proton-proton collisions at sqrt[s] = 7 TeV with the ATLAS detector.  

PubMed

A search for new phenomena in tt events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1.04 fb(-1) of data collected with the ATLAS detector at the LHC. Contributions to this final state may arise from a number of standard model extensions. The results are interpreted in terms of a model where new top-quark partners are pair produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with standard model expectations. A limit at 95% confidence level is set excluding a cross section times branching ratio of 1.1 pb for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top-partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV. PMID:22400827

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; Akesson, 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; Asman, 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; 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; Buchanan, N J; Buchholz, P; Buckingham, R M; Buckley, A G; Buda, S I; Budagov, I A; Budick, B; Büscher, V; Bugge, L; Buira-Clark, D; Bulekov, O; Bunse, M; Buran, T; Burckhart, H; Burdin, S; Burgess, T; Burke, S; Busato, E; Bussey, P; Buszello, C P; Butin, F; Butler, B; Butler, J M; Buttar, C M; Butterworth, J M; Buttinger, W; Cabrera Urbán, S; Caforio, D; Cakir, O; Calafiura, P; Calderini, G; Calfayan, P; Calkins, R; Caloba, L P; Caloi, R; Calvet, D; Calvet, S; Camacho Toro, R; Camarri, P; Cambiaghi, M; Cameron, D; Campana, S

2012-01-27

361

Effect of solvent transfer in agar gels on stress relaxation under large deformation.  

PubMed

We measured stress relaxation, volume of exuded water, and spatial distribution of stress in agar gels under large deformation. Gels with smaller sample size and lower concentration exuded water faster and had shorter stress relaxation time. Gels with the storage time of 3 days exuded more water and had shorter stress relaxation time than gels with the storage time of 1 day, and this tendency was remarkable for low-concentration gels. Examination of the spatial distribution of stress in a cylindrical gel under large deformation showed that the outer part of the gel had smaller stress than the inner part at an early stage, and the area with small stress gradually extended into the inner part. This result indicates that the inhomogeneity of water content caused by water exudation from the gel surface induces the stress distribution in the gel. PMID:24815413

Matsukawa, Shingo; Ding, Yichun; Zhao, Qiuhua; Mogi, Akiko; Tashiro, Yuri; Ogawa, Hiroo

2014-08-30

362

Radiative transfer to space through a precipitating cloud at multiple microwave frequencies. III - Influence of large ice particles  

NASA Technical Reports Server (NTRS)

The time-dependent influence of large ice particles on the brightness temperatures, T(B)s, that would be observed from space above severe thunderstorms is investigated using a vertically and angularly detailed plane-parallel microwave radiative transfer model. The impact of large ice particles on passive microwave T(B)s over an evolving model rain cloud was examined at ten separate frequencies in the EHF/SHF spectrum. It is shown that the frequency-dependent vertically distributed generalized emission/scattering weighting functions, introduced in this simulation to vertically resolve the contributions by individual cloud and precipitation layers to the T(B)s, can be used to identify the specific layers responsible for regulating the magnitude of top-of-atmoshere T(B)s.

Smith, Eric A.; Mugnai, Alberto

1989-01-01

363

A multigrid method for natural convective heat transfer with large temperature differences  

Microsoft Academic Search

Steady-state two-dimensional solutions to the full compressible Navier–Stokes equations are computed for laminar convective motion of a gas in a square cavity with large horizontal temperature differences. Results for air are presented. The ideal-gas law is used and viscosity is given by Sutherland's law. An accurate low-Mach number solver is developed. Hereby an explicit third-order discretization for the convective part

Jan Vierendeels; Bart Merci; Erik Dick

2004-01-01

364

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

365

Modulation transfer function for a large-area amorphous silicon image receptor.  

PubMed

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 10 cm2 area detector (EG&G Heimann, RTM128) consisting of 128 x 128 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. PMID:9434305

Earnhart, J R; Chaney, E L

1997-12-01

366

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

367

Large-area inverse opal structures in a bulk chalcogenide glass by spin-coating and thin-film transfer  

NASA Astrophysics Data System (ADS)

Large (cm × cm), uniform-thickness areas of an inverse-opal photonic crystal and an inverse-opal monolayer were fabricated in a high-refractive-index As30S70 chalcogenide glass. We have developed an effective low-cost, solution-based process for fabrication of photonic structures in chalcogenide glass from silica-colloidal-crystal thin-film templates (multi- and monolayer). The chalcogenide-glass solution is spin-coated over the silica-opal film template and the infilled composite structure (chalcogenide/opal) is then lifted-off and transferred onto the chalcogenide-glass disc at 225 °C, followed by removal of the template in hydrofluoric acid. The extra step introduced in this work (lift-off and transfer) allows a reproducible and large-area structure to be fabricated on a bulk chalcogenide glass. Complete infilling of the silica template is possible due to the nano-colloidal nature (particle size 2-8 nm) of the chalcogenide-glass solution and effective solvent release from the spin-coated chalcogenide film during post-annealing. The resulting chalcogenide-glass inverse-opal multilayer exhibits a Bragg peak at 670 nm with a reflectance 70%, while the inverse-opal monolayer shows anti-reflectance behaviour <2% in the near-infrared region (1215-1660 nm).

Kohoutek, T.; Orava, J.; Strizik, L.; Wagner, T.; Greer, A. L.; Bardosova, M.; Fudouzi, H.

2013-12-01

368

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

369

"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

370

Induced Angular Momentum  

ERIC Educational Resources Information Center

Discusses, classically and quantum mechanically, the angular momentum induced in the bound motion of an electron by an external magnetic field. Calculates the current density and its magnetic moment, and then uses two methods to solve the first-order perturbation theory equation for the required eigenfunction. (Author/GA)

Parker, G. W.

1978-01-01

371

Partonic Transverse Momentum Distributions  

Microsoft Academic Search

In recent years parton distributions have been generalized to account also for transverse degrees of freedom and new sets of more general distributions, Transverse Momentum Dependent (TMD) parton distributions and fragmentation functions were introduced. Different experiments worldwide (HERMES, COMPASS, CLAS, JLab-Hall A) have measurements of TMDs in semi-inclusive DIS processes as one of their main focuses of research. TMD studies

Patrizia Rossi; Patrizia

2010-01-01

372

Option pricing and momentum  

Microsoft Academic Search

When a stock pays a stochastic dividend, a negative correlation between the returns on the stock and the innovations to the dividend yield induces momentum in stock returns. This situation may arise if managers are reluctant to fully ad- just dividends to changes in earnings. This paper studies the pricing of options in such a case, within a new model

Juan Carlos Rodríguezy

373

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

374

Effects of Inlet Turbulence and Rotor/Stator Interactions on the Aerodynamics and Heat Transfer of a Large-Scale Rotating Turbine Model. Part 4. Aerodynamic Data Tabulation.  

National Technical Information Service (NTIS)

A combined experimental and analytical program was conducted to examine the effects of inlet turbulence and airfoil heat transfer. The experimental portion of the study was conducted in a large-scale (approx. 5X engine), ambient temperature, rotating turb...

R. P. Dring H. D. Joslyn M. F. Blair

1987-01-01

375

A polymer, random walk model for the size-distribution of large DNA fragments after high linear energy transfer radiation  

NASA Technical Reports Server (NTRS)

DNA double-strand breaks (DSBs) produced by densely ionizing radiation are not located randomly in the genome: recent data indicate DSB clustering along chromosomes. Stochastic DSB clustering at large scales, from > 100 Mbp down to < 0.01 Mbp, is modeled using computer simulations and analytic equations. A random-walk, coarse-grained polymer model for chromatin is combined with a simple track structure model in Monte Carlo software called DNAbreak and is applied to data on alpha-particle irradiation of V-79 cells. The chromatin model neglects molecular details but systematically incorporates an increase in average spatial separation between two DNA loci as the number of base-pairs between the loci increases. Fragment-size distributions obtained using DNAbreak match data on large fragments about as well as distributions previously obtained with a less mechanistic approach. Dose-response relations, linear at small doses of high linear energy transfer (LET) radiation, are obtained. They are found to be non-linear when the dose becomes so large that there is a significant probability of overlapping or close juxtaposition, along one chromosome, for different DSB clusters from different tracks. The non-linearity is more evident for large fragments than for small. The DNAbreak results furnish an example of the RLC (randomly located clusters) analytic formalism, which generalizes the broken-stick fragment-size distribution of the random-breakage model that is often applied to low-LET data.

Ponomarev, A. L.; Brenner, D.; Hlatky, L. R.; Sachs, R. K.

2000-01-01

376

Large File Transfers from Space Using Multiple Ground Terminals and Delay-Tolerant Networking  

NASA Technical Reports Server (NTRS)

We use Delay-Tolerant Networking (DTN) to break control loops between space-ground communication links and ground-ground communication links to increase overall file delivery efficiency, as well as to enable large files to be proactively fragmented and received across multiple ground stations. DTN proactive fragmentation and reactive fragmentation were demonstrated from the UK-DMC satellite using two independent ground stations. The files were reassembled at a bundle agent, located at Glenn Research Center in Cleveland Ohio. The first space-based demonstration of this occurred on September 30 and October 1, 2009. This paper details those experiments. Communication, delay-tolerant networking, DTN, satellite, Internet, protocols, bundle, IP, TCP.

Ivancic, William D.; Paulsen, Phillip; Stewart, Dave; Eddy, Wesley; McKim, James; Taylor, John; Lynch, Scott; Heberle, Jay; Northam, James; Jackson, Chris; Wood, Lloyd

2010-01-01

377

A multigrid method for natural convective heat transfer with large temperature differences  

NASA Astrophysics Data System (ADS)

Steady-state two-dimensional solutions to the full compressible Navier-Stokes equations are computed for laminar convective motion of a gas in a square cavity with large horizontal temperature differences. Results for air are presented. The ideal-gas law is used and viscosity is given by Sutherland's law. An accurate low-Mach number solver is developed. Hereby an explicit third-order discretization for the convective part and a line-implicit central discretization for the acoustic part and for the diffusive part are used. The semi-implicit line method is formulated in multistage form. Multigrid is used as acceleration technique. A convergence behaviour is obtained which is independent of grid size, grid aspect ratio, Mach number and Rayleigh number. Grid converged results are shown for Rayleigh numbers between 102 and 107.

Vierendeels, Jan; Merci, Bart; Dick, Erik

2004-07-01

378

Large-scale topography of Io - Implications for internal structure and heat transfer  

NASA Astrophysics Data System (ADS)

Recent stereographic methods have been applied to Voyager 1 images in order to determine the shape and large-scale topography of Io. The best triaxial figure of semiaxes of 1830.0, 1818.7, and 1815.3 kilometers is consistent with a differentiated satellite in hydrostatic equilibrium. It is suggested that many of the broad topographic swells and basins noted may be due to isostatic responses to thermal changes in the lithosphere-asthenosphere system. Results support the picture of increasing heat flow converting the basal lithosphere into a lower-density asthenosphere, resulting in isostatic uplift. It is shown that lithospheric thicknesses ranging from 5-100 km may results in elevation variations of up to 1 km.

Gaskell, R. W.; Synnott, S. P.; McEwen, A. S.; Schaber, G. G.

1988-06-01

379

Large polarization but small electron transfer for water around Al(3+) in a highly hydrated crystal.  

PubMed

Precise molecular-level information on the water molecule is precious, since it affects our interpretation of the role of water in a range of important applications of aqueous media. Here we propose that electronic structure calculations for highly hydrated crystals yield such information. Properties of nine structurally different water molecules (19 independent OO hydrogen bonds) in the Al(NO3)3·9H2O crystal have been calculated from DFT calculations. We combine the advantage of studying different water environments using one and the same compound and method (instead of comparing a set of independent experiments, each with its own set of errors) with the advantage of knowing the exact atomic positions, and the advantage of calculating properties that are difficult to extract from experiment. We find very large Wannier dipole moments for H2O molecules surrounding the cations: 4.0-4.3 D (compared to our calculated value of 1.83 D in the gas phase). These are induced by the ions and the H-bonds, while other water interactions and the relaxation of the internal water geometry in fact decrease the dipole moments. We find a good correlation between the water dipole moment and the OO distances, and an even better (non-linear) correlation with the average electric field over the molecule. Literature simulation data for ionic aqueous solutions fit quite well with our crystalline 'dipole moment vs. OO distance' curve. The progression of the water and cation charges from 'small clusters ? large clusters ? the crystal' helps explain why the net charges on all the water molecules are so small in the crystal. PMID:24718484

Mitev, Pavlin D; Bakó, Imre; Eriksson, Anders; Hermansson, Kersti

2014-05-28

380

Algorithms for Efficient Computation of Transfer Functions for Large Order Flexible Systems  

NASA Technical Reports Server (NTRS)

An efficient and robust computational scheme is given for the calculation of the frequency response function of a large order, flexible system implemented with a linear, time invariant control system. Advantage is taken of the highly structured sparsity of the system matrix of the plant based on a model of the structure using normal mode coordinates. The computational time per frequency point of the new computational scheme is a linear function of system size, a significant improvement over traditional, still-matrix techniques whose computational times per frequency point range from quadratic to cubic functions of system size. This permits the practical frequency domain analysis of systems of much larger order than by traditional, full-matrix techniques. Formulations are given for both open- and closed-loop systems. Numerical examples are presented showing the advantages of the present formulation over traditional approaches, both in speed and in accuracy. Using a model with 703 structural modes, the present method was up to two orders of magnitude faster than a traditional method. The present method generally showed good to excellent accuracy throughout the range of test frequencies, while traditional methods gave adequate accuracy for lower frequencies, but generally deteriorated in performance at higher frequencies with worst case errors being many orders of magnitude times the correct values.

Maghami, Peiman G.; Giesy, Daniel P.

1998-01-01

381

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

382

Spatialized N budgets in a large agricultural Mediterranean watershed: high loading and low transfer  

NASA Astrophysics Data System (ADS)

Despite the particular management practices and climate characteristics of the Mediterranean regions, the literature dealing with N budgets in large catchments subjected to Mediterranean conditions is scarce. The present study aims to deepen our knowledge on the N cycle within the Ebro River Basin (NE Spain) by means of two different approaches: (1) calculating a global N budget in the Ebro River Basin and (2) calculating a series of detailed regional budgets at higher geographical resolution. N inputs and outputs were spatialized by creating a map based on the most detailed information available. Fluvial and atmospheric N export was estimated together with N retention. The Ebro River Basin annually receives a relatively high amount of new N (5118 kg N km-2 yr-1), mostly in the form of synthetic fertilizers (50 %). Although it is a highly productive catchment, the net N input as food and feed import is also high (33 %). Only 8 % of this N is finally exported to the delta zone. Several territorial units characterized by different predominant uses (rainfed agriculture, irrigated agriculture and pastures) have differentiated N dynamics. However, due to the high density of irrigation channels and reservoirs that characterize Mediterranean basins, N retention is very high in all of them (median value, 92 %). These results indicate that problems of eutrophication due to N delivery in the coastal area may not be too severe but that high N retention values may instead lead to problems within the catchment, such as pollution of aquifers and rivers, as well as high atmospheric emissions. The most promising management measures are those devoted to reducing agricultural surpluses such as balanced N fertilization and low N livestock feeding.

Lassaletta, L.; Romero, E.; Billen, G.; Garnier, J.; García-Gómez, H.; Rovira, J. V.

2011-08-01

383

Spatialized N budgets in a large agricultural Mediterranean watershed: high loading and low transfer  

NASA Astrophysics Data System (ADS)

Despite the particular management practices and climate characteristics of the Mediterranean regions, the literature dealing with N budgets in large catchments subjected to Mediterranean conditions is scarce. The present study aims to deepen our knowledge on the N cycle within the Ebro River Basin (NE Spain) by means of two different approaches: (1) calculating a global N budget in the Ebro River Basin and (2) calculating a series of detailed regional budgets at higher geographical resolution. N inputs and outputs were spatialized by creating a map based on the most detailed information available. Fluvial and atmospheric N export was estimated together with N retention. The Ebro River Basin annually receives a relatively high amount of new N (5118 kg N km-2 yr-1), mostly in the form of synthetic fertilizers (50%). Although it is a highly productive catchment, the net N input as food and feed import is also high (33%). Only 8% of this N is finally exported to the delta zone. Several territorial units characterized by different predominant uses (rainfed agriculture, irrigated agriculture and pastures) have differentiated N dynamics. However, due to the high density of irrigation channels and reservoirs that characterize Mediterranean catchments, N retention is very high in all of them (median value, 91%). These results indicate that problems of eutrophication due to N delivery in the coastal area may not be too severe but that high N retention values may instead lead to problems within the catchment, such as pollution of aquifers and rivers, as well as high atmospheric emissions. The most promising management measures are those devoted to reducing agricultural surpluses through a better balanced N fertilization.

Lassaletta, L.; Romero, E.; Billen, G.; Garnier, J.; García-Gómez, H.; Rovira, J. V.

2012-01-01

384

Large Eddy Simulations of Turbulent Flow and Heat Transfer in Three-Dimensional Lid-Driven Shallow Cavities  

NASA Astrophysics Data System (ADS)

Large-eddy simulations (LES) of turbulent flow and heat transfer in three-dimensional lid-driven cavities of aspect ratios (AR) of 1, 2 and 4 are carried out at Reynolds numbers of 5000, 10000 and 20000. The governing equations are box-filtered implicitly by a finite volume scheme and are solved using a fractional-step method. Subgrid scale stresses are represented using Yoshizawa's SGS kinetic-energy transport equation. It was found that the three-dimensional vortical structures play an important role in the heat transfer characteristics at the confining walls. For AR=1, the highest levels of temperature fluctuations occur within the free shear layer between the primary vortex and the downstream secondary eddy, similar to that observed for the velocity field. Mean and RMS velocity profiles were found to be in good agreement with published experimental data. For higher aspect ratio cases the upstream secondary eddy (USE) was found to bifurcate at high Reynolds number as observed from the streamlines of mean velocity field at the mid-span plane. Interestingly for AR=4, the bifurcations of the USE further increased to five at Re=20000 which may be attributable to the Kelvin-Helmholtz type instability at the free shear layer between the Primary eddy (PE) and USE. Profiles of urms fluctuations and vrms fluctuations are studied.

Joardar, Arindom; Vanka, Surya; Jacobi, Anthony

2006-11-01

385

Analysis techniques for momentum transport  

SciTech Connect

This report discusses the following topics on momentum analysis in tokamaks and stellarators: the momentum balance equation; deposition of torque by neutral beams; effects of toroidal rotation; and experimental observations. (LSP)

Scott, S.D.

1991-08-01

386

Obama Team's Advocacy Boosts Charter Momentum  

ERIC Educational Resources Information Center

President Barack Obama and U.S. Secretary of Education Arne Duncan have been championing charter schools for months, creating what some advocates believe is the most forceful national momentum to expand the largely independent public schools since the first charter opened nearly 20 years ago. That high-profile advocacy is being matched, moreover,…

Maxwell, Lesli A.

2009-01-01

387

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

388

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

389

The Book of Phyz: Momentum  

NSDL National Science Digital Library

This item is a chapter from "The Book of Phyz," an educator's guide to teaching introductory high school physics. It features easily understood content support in the fundamentals of momentum, the relationship of Newton's Second Law and momentum, elastic and inelastic collision, and conservation of momentum. Related student activities, experiments, and assessments are included in the materials.

Baird, Dean

2006-07-18

390

Electrochemical and optical study of carotenoids in TX 100 micelles: Electron transfer and a large blue shift  

SciTech Connect

The first oxidation waves of 8{prime}-apo-{beta}-caroten-8{prime}-al (I) and 8{prime}-apo-{beta}-caroten-8{prime}nitrile (II) in TX100 micelles are clearly observed in their cyclic voltammograms (CVs). The CV of {beta}-carotene (III) in TX100 micelles shows that III is not oxidized. It is proposed that the hydrophobic barrier of the micelle is an important reason for the failure to oxidize III, which is totally located in the hydrophobic center of the micelle. The oxidation of I and II demonstrates that electrons can be transferred through the terminal groups over a distance of ca. 22 {angstrom}. An unusually large blue band shift (100 nm, relative to that in CH{sub 2}Cl{sub 2}) is observed in the optical absorption spectrum of 7{prime}-apo-7{prime},7{prime}-dicyano-{beta}-carotene (IV) in TX100 micelles. This phenomenon is not observed in the absorption spectra of other studied carotenoids. A change in the ground-state electronic structure of IV, due to the influence of water near the terminal dicyanomethylidene group, is proposed to be the major reason for this large band shift.

He, Z.; Kispert, L.D.

1999-10-21

391

scAAV-mediated gene transfer of interleukin-1-receptor antagonist to synovium and articular cartilage in large mammalian joints.  

PubMed

With the long-term goal of developing a gene-based treatment for osteoarthritis (OA), we performed studies to evaluate the equine joint as a model for adeno-associated virus (AAV)-mediated gene transfer to large, weight-bearing human joints. A self-complementary AAV2 vector containing the coding regions for human interleukin-1-receptor antagonist (hIL-1Ra) or green fluorescent protein was packaged in AAV capsid serotypes 1, 2, 5, 8 and 9. Following infection of human and equine synovial fibroblasts in culture, we found that both were only receptive to transduction with AAV1, 2 and 5. For these serotypes, however, transgene expression from the equine cells was consistently at least 10-fold higher. Analyses of AAV surface receptor molecules and intracellular trafficking of vector genomes implicate enhanced viral uptake by the equine cells. Following delivery of 1 × 10(11) vector genomes of serotypes 2, 5 and 8 into the forelimb joints of the horse, all three enabled hIL-1Ra expression at biologically relevant levels and effectively transduced the same cell types, primarily synovial fibroblasts and, to a lesser degree, chondrocytes in articular cartilage. These results provide optimism that AAV vectors can be effectively adapted for gene delivery to large human joints affected by OA. PMID:23151520

Watson, R S; Broome, T A; Levings, P P; Rice, B L; Kay, J D; Smith, A D; Gouze, E; Gouze, J-N; Dacanay, E A; Hauswirth, W W; Nickerson, D M; Dark, M J; Colahan, P T; Ghivizzani, S C

2013-06-01

392

Large-eddy simulation of the daytime boundary layer and heat transfer processes over an idealized valley  

NASA Astrophysics Data System (ADS)

The mechanisms governing the evolution of the daytime boundary layer and the heat transfer over an idealized, infinitely-long valley are investigated by means of large-eddy simulations. To allow for the response of the surface fluxes to the evolving slope flows, the atmosphere is coupled to an interactive land surface and the surface fluxes are computed based on Monin-Obukhov similarity theory. To simplify the process study, the valley system is forced by a prescribed, time-invariant incoming solar radiation flux, resulting in near-steady turbulence after about 1 hour. The structure of the boundary layer is documented in terms of first- and second-moment statistics and the spatial variation of the PBL height. To analyze the heat transfer processes during the daytime heating of the valley atmosphere, the flow field is decomposed into its mean and turbulent component. As documented in previous studies, the mean component consists of the upslope flows, quasi-steady thermals over the mountain ridges, and two compensating circulations, one below and one above the capping inversion over the valley. The flow decomposition allows to clearly distinguish between the different heating processes, those associated with the mean flow, such as advection-induced cooling by the upslope flows and the warming induced by the compensating subsidence, and those associated with the turbulent motions. The latter include the warming of the mixed layer due to the divergence of the turbulent heat flux and cooling in the capping inversion due to overshooting thermals. These different processes are quantified and this local point of view is complemented by the analysis of the bulk valley heat budget and the associated heat fluxes.

Schmidli, J.

2012-04-01

393

Interface between path and orbital angular momentum entanglement for high-dimensional photonic quantum information.  

PubMed

Photonics has become a mature field of quantum information science, where integrated optical circuits offer a way to scale the complexity of the set-up as well as the dimensionality of the quantum state. On photonic chips, paths are the natural way to encode information. To distribute those high-dimensional quantum states over large distances, transverse spatial modes, like orbital angular momentum possessing Laguerre Gauss modes, are favourable as flying information carriers. Here we demonstrate a quantum interface between these two vibrant photonic fields. We create three-dimensional path entanglement between two photons in a nonlinear crystal and use a mode sorter as the quantum interface to transfer the entanglement to the orbital angular momentum degree of freedom. Thus our results show a flexible way to create high-dimensional spatial mode entanglement. Moreover, they pave the way to implement broad complex quantum networks where high-dimensionally entangled states could be distributed over distant photonic chips. PMID:25073906

Fickler, Robert; Lapkiewicz, Radek; Huber, Marcus; Lavery, Martin P J; Padgett, Miles J; Zeilinger, Anton

2014-01-01

394

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

395

Transfer and assembly of large area TiO2 nanotube arrays onto conductive glass for dye sensitized solar cells  

NASA Astrophysics Data System (ADS)

Highly ordered titanium oxide nanotube arrays are synthesized by a two-step anodic oxidation of pure titanium foil at constant voltage. It is found that the length of nanotube arrays firstly increased rapidly with the anodization time, and then the growth rate gradually slowed down with further increasing the anodization time. The mechanism of anodization time-dependent tube length growth is discussed. Large area free-standing TiO2 nanotube (TNT) arrays are detached from the underlying Ti foil and transferred onto the fluorine-doped tin oxide (FTO) conductive glass substrates to serve as the photoanodes of the dye-sensitized solar cells (DSSCs). The photoelectric performance of the DSSCs assembled by TNT/FTO films is strongly related to the tube length of titania and the surface treatment. For the photoanodes without any surface modification, the highest overall photovoltaic conversion efficiency (PCE) that can be achieved is 4.12% in the DSSC assembled with 33-?m-thick TNT arrays, while the overall PCE of DSSC based on the 33-?m-thick TNT arrays increases to 9.02% in response to the treatment with TiCl4.

Zhang, Jun; Li, Siqian; Ding, Hao; Li, Quantong; Wang, Baoyuan; Wang, Xina; Wang, Hao

396

Combined heat transfer in floating zone growth of large silicon crystals with radiation on diffuse and specular surfaces  

NASA Astrophysics Data System (ADS)

Numerical analyses are conducted to investigate the combined heat transfer in floating zone growth of large Si crystals with needle-eye technique. The radiation element method, REM2, is employed to determine the radiative heat exchange, in which the view factors associated with the components in the float zone furnace and both the diffuse and specular reflection components are incorporated. The boundary element method and the finite difference method are adopted to calculate the electromagnetic field and the heat conduction, respectively. The effect of surface radiative characteristics of Si melt and crystal, i.e., diffuse and/or specular, is discussed in detail. It is found that the consideration of specular surfaces increases the Joulean heat and the radiative heat flux. The temperature fields are obtained for the cases of diffuse and specular, and the difference between the two different cases is obvious in the crystal and molten zone areas. The molten zone is enlarged when the specular surface is accounted for. The interface shape is examined and found to be in good agreement with the experiment.

Guo, Zhixiong; Maruyama, Shigenao; Togawa, Shinji

1998-01-01

397

Partonic Transverse Momentum Distributions  

SciTech Connect

In recent years parton distributions have been generalized to account also for transverse degrees of freedom and new sets of more general distributions, Transverse Momentum Dependent (TMD) parton distributions and fragmentation functions were introduced. Different experiments worldwide (HERMES, COMPASS, CLAS, JLab-Hall A) have measurements of TMDs in semi-inclusive DIS processes as one of their main focuses of research. TMD studies are also an important part of the present and future Drell-Yan experiments at RICH and JPARC and GSI, respectively, Studies of TMDs are also one of the main driving forces of the Jefferson Lab (JLab) 12 GeV upgrade project. Progress in phenomenology and theory is flourishing as well. In this talk an overview of the latest developments in studies of TMDs will be given and newly released results, ongoing activities, as well as planned near term and future measurements will be discussed.

Rossi, Patrizia [Laboratori Nazionali di Frascati-INFN, Via E. Fermi 40, 00044 Frascati (Italy)

2010-08-04

398

Partonic Transverse Momentum Distributions  

NASA Astrophysics Data System (ADS)

In recent years parton distributions have been generalized to account also for transverse degrees of freedom and new sets of more general distributions, Transverse Momentum Dependent (TMD) parton distributions and fragmentation functions were introduced. Different experiments worldwide (HERMES, COMPASS, CLAS, JLab-Hall A) have measurements of TMDs in semi-inclusive DIS processes as one of their main focuses of research. TMD studies are also an important part of the present and future Drell-Yan experiments at RICH and JPARC and GSI, respectively, Studies of TMDs are also one of the main driving forces of the Jefferson Lab (JLab) 12 GeV upgrade project. Progress in phenomenology and theory is flourishing as well. In this talk an overview of the latest developments in studies of TMDs will be given and newly released results, ongoing activities, as well as planned near term and future measurements will be discussed.

Rossi, Patrizia

2010-08-01

399

Angular Momentum Diagrams  

NASA Astrophysics Data System (ADS)

Starting from the simplest possible building blocks--a ket, a bra, a time-reversed ket, and a time-reversed bra--a diagrammatic formalism is developed for angular momentum coupling problems. The formalism comprises Clebsch-Gordan coefficients as well as 3jm-symbols. The idea of constructing invariants (internal lines) by contracting contragredient pairs of quantities is emphasized throughout. The Clebsch-Gordan series, and its extension to the coupling of more than two angular momenta, is introduced algebraically and diagrammatically. Recoupling between bases obtained in different coupling schemes is introduced and the connection between recoupling coefficients and irreducible 3nj-symbols is derived diagrammatically. The well-known diagrammatic rules due to Jucys and co-workers are derived by group theoretical means and simple rules for their practical exploitation are presented.

Wormer, Paul E. S.; Paldus, Josef

400

Optimising network transfers to and from Queen Mary University of London, a large WLCG tier-2 grid site  

NASA Astrophysics Data System (ADS)

Optimising network performance is key to high bandwidth data transfers required for a Tier-2 site. We describe the techniques we have used to obtain good performance. Monitoring plays a key part, as does the elimination of bottlenecks and tuning TCP window sizes. Multiple parallel transfers allowed us to saturate a l Gbit/s link for 24 hours - whilst still achieving acceptable download speeds. Source based routing and multiple data transfer servers allowed us to use an otherwise unused "resilient" link.

Walker, C. J.; Traynor, D. P.; Rand, D. T.; Froy, T. S.; Lloyd, S. L.

2014-06-01