Now showing items 675-694 of 911

  • R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions 

    Boboltz, D. A.; Diamond, P. J.; Kemball, A. J. (IOP PUBLISHING LTD, 1997-10)
    We have made the first detection of circumstellar SiO maser proper motions in the envelope of a late-type star. Using the Very Long Baseline Array (VLBA), we have obtained observations at four epochs of the 43 GHz, upsilon ...
  • Radial oscillations of encapsulated microbubbles in viscoelastic liquids 

    D. B. Khismatullin; A. Nadim (American Institute of Physics, 2002-10)
    The small-amplitude radial oscillations of a gas microbubble encapsulated by a viscoelastic solid shell and surrounded by a slightly compressible viscoelastic liquid are studied theoretically. The Kelvin-Voigt and 4-constant ...
  • radial velocity offsets due to mass outflows and extinction in active galactic nuclei 

    Crenshaw, D. M.; Schmitt, H. R.; Kraemer, S. B.; Mushotzky, R. F.; Dunn, J. P. (IOP Publishing Ltd., 2010-01)
    We present a study of the radial velocity offsets between narrow emission lines and host galaxy lines (stellar absorption and Hi 21 cm emission) in Seyfert galaxies with observed redshifts less than 0.043. We find that 35% ...
  • Radiative and Auger Decay Data for Modeling Nickel K Lines 

    Palmeri, P.; Quinet, P.; Mendoza, C.; Bautista, M. A.; Garcia, J.; Witthoeft, M. C.; Kallman, T. R. (IOP PUBLISHING LTD, 2008-12)
    Radiative and Auger decay data have been calculated for modeling the K lines in ions of the nickel isonuclear sequence, from Ni(+) up to Ni(27+). Level energies, transition wavelengths, radiative transition probabilities, ...
  • Radiative transition rates and collision strengths for Si II 

    Bautista, M. A.; Quinet, P.; Palmeri, P.; Badnell, N. R.; Dunn, J.; Arav, N. (EDP SCIENCES, 2009-12)
    Aims. This work reports on radiative transition rates and electron impact excitation collision strengths for levels of the 3s(2)3p, 3s3p(2), 3s(2)4s, and 3s(2)3d configurations of Si II. Methods. The radiative data were ...
  • Raman studies of sol-gel alumina - finite-size effects in nanocrystalline ALO(OH) 

    Doss, C. J.; Zallen, R. (American Physical Society, 1993-12-01)
    A systematic Raman-scattering investigation has been carried out on sol-gel alumina prepared by the hot-water hydrolysis and condensation of AI(OC4H9)3, the Yoldas process, as a function of process variables such as the ...
  • Raman_scattering studies of silicon_implanted gallium arsenide: The role of amorphicity 

    Holtz, Mark; Zallen, Richard H.; Geissberger, Art E.; Sadler, R. A. (American Institute of Physics, 1986-03-15)
    A series of Raman_scattering experiments were carried out on GaAsimplanted with Si+ and with SiF+ 3 ions, both before and after annealing, for samples subjected to fluences spanning a wide range. The implantation_induced ...
  • RBSC-NVSS Sample. I. Radio and Optical Identifications of a Complete Sample of 1556 Bright X-Ray Sources 

    Bauer, F. E.; Condon, J. J.; Thuan, T. X.; Broderick, J. J. (IOP PUBLISHING LTD, 2000-08)
    We cross-identified the ROSAT Bright Source Catalog (RBSC) and the NRAO VLA Sky Survey (NVSS) to construct the RBSC-NVSS sample of the brightest X-ray sources (greater than or equal to0.1 counts s(-1)similar to 10(-12) ...
  • Reaction-controlled diffusion: Monte Carlo simulations 

    Reid, B. A.; Tauber, U. C.; Brunson, J. C. (American Physical Society, 2003-10)
    We study the coupled two-species nonequilibrium reaction-controlled diffusion model introduced by Trimper [Phys. Rev. E 62, 6071 (2000)] by means of detailed Monte Carlo simulations in one and two dimensions. Particles of ...
  • Reactor (nu)over-bar(e) disappearance in the Double Chooz experiment 

    Abe, Y.; Aberle, C.; dos Anjos, J. C.; Barriere, J. C.; Bergevin, M.; Bernstein, A.; Bezerra, T. J. C.; Bezrukhov, L.; Blucher, E.; Bowden, N. S.; Buck, C.; Busenitz, J.; Cabrera, A.; Caden, E.; Camilleri, L.; Carr, R.; Cerrada, M.; Chang, P. J.; Chimenti, P.; Classen, T.; Collin, A. P.; Conover, E.; Conrad, J. M.; Crespo-Anadon, J. I.; Crum, K.; Cucoanes, A.; D'Agostino, M. V.; Damon, E.; Dawson, J. V.; Dazeley, S.; Dietrich, D.; Djurcic, Z.; Dracos, M.; Durand, V.; Ebert, J.; Efremenko, Y.; Elnimr, M.; Etenko, A.; Fallot, M.; Fechner, M.; von Feilitzsch, F.; Felde, J.; Franco, D.; Franke, A. J.; Franke, M.; Furuta, H.; Gama, R.; Gil-Botella, I.; Giot, L.; Goger-Neff, M.; Gonzalez, L. F. G.; Goodman, M. C.; Goon, J. T. M.; Greiner, D.; Haag, N.; Hagner, C.; Hara, T.; Hartmann, F. X.; Haser, J.; Hatzikoutelis, A.; Hayakawa, T.; Hofmann, M.; Horton-Smith, G. A.; Hourlier, A.; Ishitsuka, M.; Jochum, J.; Jollet, C.; Jones, C. L.; Kaether, F.; Kalousis, L. N.; Kamyshkov, Y.; Kaplan, D. M.; Kawasaki, T.; Keefer, G.; Kemp, E.; de Kerret, H.; Kibe, Y.; Konno, T.; Kryn, D.; Kuze, M.; Lachenmaier, T.; Lane, C. E.; Langbrandtner, C.; Lasserre, T.; Letourneau, A.; Lhuillier, D.; Lima, H. P.; Lindner, M.; Lopez-Castano, J. M.; LoSecco, J. M.; Lubsandorzhiev, B. K.; Lucht, S.; McKee, D.; Maeda, J.; Maesano, C. N.; Mariani, C.; Maricic, J.; Martino, J.; Matsubara, T.; Mention, G.; Meregaglia, A.; Miletic, T.; Milincic, R.; Miyata, H.; Mueller, T. A.; Nagasaka, Y.; Nakajima, K.; Novella, P.; Obolensky, M.; Oberauer, L.; Onillon, A.; Osborn, A.; Ostrovskiy, I.; Palomares, C.; Pepe, I. M.; Perasso, S.; Perrin, P.; Pfahler, P.; Porta, A.; Potzel, W.; Reichenbacher, J.; Reinhold, B.; Remoto, A.; Rohling, M.; Roncin, R.; Roth, S.; Sakamoto, Y.; Santorelli, R.; Sato, F.; Schonert, S.; Schoppmann, S.; Schwetz, T.; Shaevitz, M. H.; Shimojima, S.; Shrestha, D.; Sida, J. L.; Sinev, V.; Skorokhvatov, M.; Smith, E.; Spitz, J.; Stahl, A.; Stancu, I.; Stokes, L. F. F.; Strait, M.; Stuken, A.; Suekane, F.; Sukhotin, S.; Sumiyoshi, T.; Sun, Y.; Svoboda, R.; Terao, K.; Tonazzo, A.; Toups, M.; Thi, H. H. T.; Valdiviesso, G.; Veyssiere, C.; Wagner, S.; Watanabe, H.; White, B.; Wiebusch, C.; Winslow, L.; Worcester, M.; Wurm, M.; Yermia, F.; Zimmer, V.; Double Chooz, Collaboration (American Physical Society, 2012-09-18)
    The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power X detector mass X live time) exposure using a 10.3 m(3) fiducial volume detector ...
  • real-time moiré interferometry using a Fabry-Perot cavity with a phase conjugate mirror 

    Indebetouw, G.; Lo, K. P. (Optical Society of America, 1989-11)
    We describe a self-referencing interferometer in which the wavefront and its complex conjugate are generated in a Fabry-Perot cavity having one phase conjugate mirror (PCM). The finite response time of the PCM allows one ...
  • Recycling BICG with an application to model reduction 

    Ahuja, K.; de Sturler, E.; Gugercin, S.; Chang, E. R. (Siam Publications, 2012)
    Science and engineering problems frequently require solving a sequence of dual linear systems. Besides having to store only a few Lanczos vectors, using the biconjugate gradient method (BiCG) to solve dual linear systems ...
  • Recycling Krylov subspaces for sequences of linear systems 

    Parks, M. L.; De Sturler, E.; Mackey, G.; Johnson, D. D.; Maiti, S. (Siam Publications, 2006)
    Many problems in science and engineering require the solution of a long sequence of slowly changing linear systems. We propose and analyze two methods that significantly reduce the total number of matrix-vector products ...
  • Red Alert - Climate Change: This is the Last Chance 

    Cairns, John (Virginia Tech Research Magazine, 2014-01-22)
    Humankind has already passed the first climatic tipping point therefore engaging itself in a global experiment that has already reduced agricultural productivity. With the Artic ice melting 100 years ahead of IPCC prediction, ...
  • Rediscovering the King of Woodpeckers: Exploring the Implications 

    Walters, J. R.; Crist, E. L. (Resilience Alliance, 2005-12)
    The Ivory-billed Woodpecker has long held a special place in the psyche of North American conservation, eliciting unusually colorful prose, even from scientists, as an icon of the wild. The reverence in which it was held ...
  • Relating the cosmological constant and supersymmetry breaking in warped compactifications of IIB string theory 

    Berglund, P.; Hubsch, T.; Minic, D. (American Physical Society, 2003-02-15)
    It has been suggested that the observed value of the cosmological constant is related to the supersymmetry breaking scale M-susy through the formula Lambdasimilar toM(p)(4)(M-susy/M-p)(8). We point out that a similar ...
  • Relaxation and glassy dynamics in disordered type-II superconductors 

    Pleimling, M.; Tauber, U. C. (American Physical Society, 2011-11-18)
    We study the nonequilibrium relaxation kinetics of interacting magnetic flux lines in disordered type II superconductors at low temperatures and low magnetic fields by means of a three-dimensional elastic-line model and ...
  • Relaxation of photoinduced spins and carriers in ferromagnetic InMnSb films 

    Nontapot, K.; Kini, R. N.; Gifford, A.; Merritt, T. R.; Khodaparast, G. A.; Wojtowicz, T.; Liu, X.; Furdyna, J. K. (AIP Publishing, 2007-04)
    The authors report time resolved measurements and control of photoinduced spin and carrier relaxations in InMnSb ferromagnetic films with 2% Mn content (grown by low-temperature molecular beam epitaxy) using femtosecond ...
  • The Reluctant Warriors: Scientist vs Public Relations Spin Doctors 

    Cairns, John (Virginia Tech, 2014-01-22)
    When scientists listen to analyses of existing evidence, they usually can decipher which analysis is supported by a preponderance of evidence, and if no clear evidence emerges they wait until adequate information is ...
  • Remarks on "On the coefficient of nonlinearity in nonlinear acoustics" 

    Tarkenton, Grey M. (Acoustical Society of America, 1990-10)
    Through an alternate analysis, the results of Hamilton and Blackstock [J. Acoust. Soc. Am. 83, 74-77 (1988)] are reviewed and a new interpretation is presented. In this view, the nonlinearity of the momentum equation is ...