Now showing items 1-20 of 422

    • 1/N expansion for the degenerate Anderson model in the mixed-valence regime 

      Zhang, F. C.; Lee, T. K. (American Physical Society, 1983-07)
      The 1N expansion method for the degenerate Anderson model is formulated. N is the degeneracy factor of one of the f-electron configurations. Various ground-state properties are calculated. Excellent agreement with the ...
    • 14-year program monitoring the flux densities of 33 radio sources at low frequencies 

      Salgado, J. F.; Altschuler, D. R.; Ghosh, T.; Dennison, B. K.; Mitchell, K. J.; Payne, H. E. (IOP PUBLISHING LTD, 1999-01)
      We present the results of a low-frequency flux density monitoring program of 33 extragalactic radio sources. The light curves at 318 and 430 MHz over a 14 yr period are presented. The measurements were made with the NAIC ...
    • a 10 kpc scale seyfert galaxy outflow: hst/cos observations of iras f22456-5125 

      Borguet, B. C. J.; Edmonds, D.; Arav, N.; Dunn, J.; Kriss, G. A. (IOP Publishing Ltd., 2012-06)
      We present analysis of the UV spectrum of the low-z AGN IRAS F22456-5125 obtained with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. The spectrum reveals six main kinematic components, spanning a ...
    • A discrete-velocity, stationary Wigner equation 

      Arnold, A.; Lange, H.; Zweifel, P. F. (AIP Publishing, 2000-11)
      This paper is concerned with the one-dimensional stationary linear Wigner equation, a kinetic formulation of quantum mechanics. Specifically, we analyze the well-posedness of the boundary value problem on a slab of the ...
    • A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment 

      Holley, A. T.; Broussard, L. J.; Davis, J. L.; Hickerson, K.; Ito, T. M.; Liu, C. Y.; Lyles, J. T. M.; Makela, M.; Mammei, R. R.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R.; Pattie, R. W.; Rios, R.; Saunders, A.; Young, A. R. (AIP Publishing, 2012-07)
      The UCNA collaboration is making a precision measurement of the beta asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron ...
    • A low-frequency radio array for space 

      Weiler, K. W.; Dennison, B. K.; Johnston, K. J.; Simon, R. S.; Erickson, W. C.; Kaiser, M. L.; Cane, H. V.; Desch, M. D.; Hammarstrom, L. M. (EDP SCIENCES, 1988-04)
      At the lowest radio frequencies (<30 MHz), the Earth's ionosphere transmits poorly or not at all. This relatively unexplored region of the electromagnetic spectrum is thus an area where high resolution, high sensitivity ...
    • a new method of surface-resistance measurement with a niobium triaxial cavity working at 2-K 

      Liang, C. N.; Phillips, L.; Sundelin, R. (AIP Publishing, 1993-07)
      A 1.5-GHz superconducting niobium triaxial cavity has been fabricated to study residual surface resistance of superconducting materials at 2 K. Unlike many other structures where the entire test samples have to be placed ...
    • A New Population of High-z, Dusty Lyα Emitters and Blobs Discovered by WISE: Feedback Caught in the Act? 

      Bridge, C. R.; Blain, A.; Borys, C. J. K.; Petty, S.; Benford, D.; Eisenhardt, P.; Farrah, D.; Griffith, R. L.; Jarrett, T.; Lonsdale, C.; Stanford, S. A.; Stern, D.; Tsai, C. W.; Wright, E. L.; Wu, J. W. (IOP PUBLISHING LTD, 2013-06)
      By combining data from the NASA Wide-field Infrared Survey Explorer (WISE) mission with optical spectroscopy from the W. M. Keck telescope, we discover a mid-IR color criterion that yields a 78% success rate in identifying ...
    • A note on the iteration of the Chandrasekhar non-linear H-equation 

      Bowden, R. L. (AIP Publishing, 1979-04)
      An iteration scheme to solve the Chandrasekhar H equation in the form H (_) ={1___F_ 1 0[_ (s) H (s)]/(s +_) d s}_1 is shown to converge monotonically and uniformly.
    • a population of z > 2 far-infrared herschel-spire-selected starbursts 

      Casey, C. M.; Berta, S.; Bethermin, M.; Bock, J.; Bridge, C.; Burgarella, D.; Chapin, E.; Chapman, S. C.; Clements, D. L.; Conley, A.; Conselice, C. J.; Cooray, A.; Farrah, D.; Hatziminaoglou, E.; Ivison, R. J.; le Floc'h, E.; Lutz, D.; Magdis, G.; Magnelli, B.; Oliver, S. J.; Page, M. J.; Pozzi, F.; Rigopoulou, D.; Riguccini, L.; Roseboom, I. G.; Sanders, D. B.; Scott, D.; Seymour, N.; Valtchanov, I.; Vieira, J. D.; Viero, M.; Wardlow, J. (IOP Publishing Ltd., 2012-12)
      We present spectroscopic observations for a sample of 36 Herschel-Spire 250-500 mu m selected galaxies (HSGs) at 2 < z < 5 from the Herschel Multi-tiered Extragalactic Survey. Redshifts are confirmed as part of a large ...
    • a precision test for an extra spatial dimension using black-hole-pulsar binaries 

      Simonetti, J. H.; Kavic, M.; Minic, D.; Surani, U.; Vijayan, V. (IOP Publishing Ltd., 2011-08)
      We discuss the observable effects of enhanced black hole mass loss in a black hole-neutron star (BH-NS) binary, due to the presence of a warped extra spatial dimension of curvature radius L in the braneworld scenario. For ...
    • a redshift survey of herschel far-infrared selected starbursts and implications for obscured star formation 

      Casey, C. M.; Berta, S.; Bethermin, M.; Bock, J.; Bridge, C.; Budynkiewicz, J.; Burgarella, D.; Chapin, E.; Chapman, S. C.; Clements, D. L.; Conley, A.; Conselice, C. J.; Cooray, A.; Farrah, D.; Hatziminaoglou, E.; Ivison, R. J.; le Floc'h, E.; Lutz, D.; Magdis, G.; Magnelli, B.; Oliver, S. J.; Page, M. J.; Pozzi, F.; Rigopoulou, D.; Riguccini, L.; Roseboom, I. G.; Sanders, D. B.; Scott, D.; Seymour, N.; Valtchanov, I.; Vieira, J. D.; Viero, M.; Wardlow, J. (IOP Publishing Ltd., 2012-12)
      We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500 mu m, taken with the Keck I Low Resolution Imaging Spectrometer and the Keck II DEep ...
    • A Water Maser Flare in W49N: Amplification by a Rotating Foreground Cloud 

      Boboltz, D. A.; Simonetti, J. H.; Dennison, B.; Diamond, P. J.; Uphoff, J. A. (IOP PUBLISHING LTD, 1998-12)
      We monitored the 22 GHz H2O maser emission toward W49N from December 1989 through May 1990. During this period we observed an outburst in a component at -66.25 km s(-1). The flux density of the flaring component increased ...
    • Aging in coarsening diluted ferromagnets 

      Park, H.; Pleimling, M. (American Physical Society, 2010-10)
      We comprehensively study nonequilibrium relaxation and aging processes in the two-dimensional randomsite Ising model through numerical simulations. We discuss the dynamical correlation length as well as scaling functions ...
    • Aging processes in systems with anomalous slow dynamics 

      Afzal, N.; Pleimling, M. (American Physical Society, 2013-01-14)
      Recently, different numerical studies of coarsening in disordered systems have shown the existence of a crossover from an initial, transient, power-law domain growth to a slower, presumably logarithmic, growth. However, ...
    • alpha-states in de Sitter space 

      de Boer, J.; Jejjala, V.; Minic, D. (American Physical Society, 2005-02)
      Field theory in de Sitter space admits a one-parameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States ...
    • Aluminum plasmonic nanostructures for improved absorption in organic photovoltaic devices 

      Kochergin, V.; Neely, L.; Jao, C. Y.; Robinson, H. D. (AIP Publishing, 2011-03)
      We model the absorption enhancement in organic photovoltaic devices induced by incorporating Al, Ag, and Au nanoparticles in the active layer. We find that Al nanoparticles should yield significantly greater enhancement ...
    • Analysis of optical response of long period fiber gratings to nm-thick thin-film coatings 

      Wang, Z. Y.; Heflin, James R.; Stolen, R. H.; Ramachandran, S. (Optical Society of America, 2005-04-01)
      We have theoretically and experimentally demonstrated that the resonant wavelength of long period fiber gratings (LPG) can be shifted by a large magnitude by coating with only a nm-thickthin-film that has a refractive index ...
    • analysis of the dispersion function for anisotropic longitudinal plasma-waves 

      Arthur, M. D.; Bowden, R. L.; Zweifel, P. F. (AIP Publishing, 1979-10)
      An analysis of the zeros of the dispersion function for longitudinal plasma waves is made. In particular, the plasma equilibriumdistribution function is assumed to have two relative maxima and is not necessarily an even ...
    • Analytic approximation to the ground-state energy of the Anderson model 

      Mancini, J. D.; Massano, W. J.; Potter, C. D.; Bowen, S. P. (American Physical Society, 1988-09)
      Using the nonperturbative Lanczos recursion scheme an analytic approximation to the ground-state energy of the single-impurity Anderson model is obtained. Calculations are carried out to a 5x5 matrix truncation. Comparisons ...