Now showing items 718-737 of 977

    • 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 and optical studies of argon-etched GaAs surfaces 

      Feng, G. F.; Zallen, R.; Epp, J. M.; Dillard, J. G. (American Physical Society, 1991-04)
      We have studied the structual damage in low-energy argon-ion-bombarded (ion-etched) GaAs using Raman scattering and ultraviolet reflectivity. When combined with post-bombardment sequential chemical etching, the Raman results ...
    • Raman-scattering depth profile of the structure of ion-implanted GaAs 

      Holtz, M.; Zallen, R.; Brafman, O.; Matteson, S. (American Physical Society, 1988-03)
      We have carried out an extensive Raman-scattering investigation of the structure of beryllium-implanted gallium arsenide. Single-crystal GaAs was bombarded with 45-keV Be+ ions, and backscattering Raman measurements were ...
    • 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 ...
    • relationship between normalization coefficient and dispersion function for multigroup transport equation 

      Feigenbaum, M. J. (AIP Publishing, 1976-05)
      An explicit formula for the discrete Case normalization coefficient is presented in terms of functions related to the dispersion function. These functions are easily determined and provide the normalization coefficient ...
    • 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 ...