Now showing items 758-777 of 794

    • Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl 

      Zenz, C.; Cerullo, G.; Lanzani, G.; Graupner, W.; Meghdadi, F.; Leising, G.; De Silvestri, S. (American Physical Society, 1999-06)
      We present femtosecond pump-probe measurements, both conventional and electric field-assisted, on organic light-emitting devices based on para-hexaphenyl. The dominant triplet excition generation mechanism is assigned to ...
    • Ultraviolet and X-ray Variability of the Seyfert 1.5 Galaxy Markarian 817 

      Winter, L. M.; Danforth, C.; Vasudevan, R.; Brandt, W. N.; Scott, J.; Froning, C.; Keeney, B.; Shull, J. M.; Penton, S.; Mushotzky, R.; Schneider, D. P.; Arav, Nahum (IOP PUBLISHING LTD, 2011-02)
      We present an investigation of the ultraviolet and X-ray spectra of the Seyfert 1.5 galaxy Markarian 817. The ultraviolet analysis includes two recent observations taken with the Cosmic Origins Spectrograph (COS) in 2009 ...
    • Uniqueness of solutions to the linearized Boltzmann equation 

      Garbanati, L. F.; Greenberg, W.; Zweifel, P. F. (AIP Publishing, 1978-01)
      Uniqueness theorems are proved for the linearized Boltzmann equation for both the ’’exterior’’ and ’’interior’’ problems under generalized Maxwellboundary conditions. The solution space is a weighted L p space, and agrees ...
    • Universal torsion induced interaction from large extra dimensions 

      Takeuchi, T.; Chang, L. N.; Lebedev, O.; Loinaz, W. (Amer Inst Physics, 2001-01-01)
    • Universal torsion-induced interaction from large extra dimensions 

      Chang, L. N.; Lebedev, O.; Loinaz, W.; Takeuchi, T. (American Physical Soc, 2000-10-30)
    • Universality classes for critical wetting 

      Kroll, D. M.; Lipowsky, R.; Zia, R. K. P. (American Physical Society, 1985-08)
      The systematics of the wetting transition at solid-gas interfaces in systems interacting with inversepower-law potentials is investigated. The correct form of the effective Hamiltonian for l, the interfacesubstrate separation, ...
    • Universality classes in the anisotropic Kardar-Parisi-Zhang model 

      Täuber, Uwe C.; Frey, E. (E D P Sciences, 2002-09-01)
    • Universality in the percolation problem—Anomalous dimensions of φ4 operators 

      Amit, D. J.; Wallace, D. J.; Zia, R. K. P. (American Physical Society, 1977-05)
      We consider critical systems, such as the percolation problem, whose symmetry permits an invariant interaction of third order in the fluctuating fields φ. In the renormalization-group approach one is naturally led to look ...
    • Unusual water flux in the extracellular polysaccharide of the cyanobacterium Nostoc commune 

      Shaw, Eric; Hill, Donna R.; Brittain, Nicole; Wright, Debbie J.; Täuber, Uwe C.; Marand, Hervé; Helm, Richard F.; Potts, Malcolm (Amer Soc Microbiology, 2003-09-01)
      The speed of water uptake by desiccated Nostoc commune was found to depend upon the duration of desiccation. The rehydration of desiccated colonies led to marked, time-dependent changes in structure and ultrastructure ...
    • Upconverting nanocomposites dispersed in urea-containing acrylics 

      Inglefield, David Lott, Jr.; Merritt, Travis R.; Magill, Brenden A.; Long, Timothy E.; Khodaparast, Giti A. (The Royal Society of Chemistry, 2015-05-08)
      Lanthanide-doped upconverting nanoparticles (UCNPs) have the ability to convert low energy photons into high energy photons, making this material appealing for a variety of scientific pursuits, from solar energy conversion ...
    • Using L/E Oscillation Probability Distributions 

      Aguilar-Arevalo, A. A.; Brown, B. C.; Bugel, L.; Cheng, G.; Church, E. D.; Conrad, J. M.; Dharmapalan, R.; Djurcic, Z.; Finley, D. A.; Ford, R.; Garcia, F. G.; Garvey, G. T.; Grange, J.; Huelsnitz, W.; Ignarra, C.; Imlay, R.; Johnson, R. A.; Karagiorgi, G.; Katori, T.; Kobilarcik, T.; Louis, W. C.; Mariani, Camillo; Marsh, W.; Mills, G. B.; Mirabal, J.; Moore, C. D.; Mousseau, J.; Nienaber, P.; Osmanov, B.; Pavlovic, Z.; Perevalov, D.; Polly, C. C.; Ray, H.; Roe, B. P.; Russell, A. D.; Shaevitz, M. H.; Spitz, J.; Stancu, I.; Tayloe, R.; Water, R. G. V. D.; White, D. H.; Wickremasinghe, D. A.; Zeller, G. P.; Zimmerman, E. D.
      This paper explores the use of L/E oscillation probability distributions to compare experimental measurements and to evaluate oscillation models. In this case, L is the distance of neutrino travel and E ...
    • Using reactors to measure theta(13) 

      Shaevitz, M. H.; Link, J. M. (2004)
    • UV-bright nearby early-type galaxies observed in the mid-infrared: evidence for a multi-stage formation history by way of WISE and GALEX imaging 

      Petty, S. M.; Neill, J. D.; Jarrett, T. H.; Blain, A. W.; Farrah, Duncan; Rich, R. M.; Tsai, C. W.; Benford, D. J.; Bridge, C. R.; Lake, S. E.; Masci, F. J.; Wright, E. L. (IOP Publishing Ltd., 2013-10)
      In the local universe, 10% of massive elliptical galaxies are observed to exhibit a peculiar property: a substantial excess of ultraviolet emission than what is expected from their old, red stellar populations. Several ...
    • Validating quantum-classical programming models with tensor network simulations 

      McCaskey, Alexander; Dumitrescu, Eugene; Chen, Mengsu; Lyakh, Dmitry; Humble, Travis (PLOS, 2018-12-10)
      The exploration of hybrid quantum-classical algorithms and programming models on noisy near-term quantum hardware has begun. As hybrid programs scale towards classical intractability, validation and benchmarking are critical ...
    • Variational and nonvariational principles in quantum transport calculations 

      Yang, Z. Q.; Tackett, A.; Di Ventra, M. (American Physical Society, 2002-07)
      A variational principle is not generally satisfied in steady-state quantum transport as opposed to the case of ground-state problems. We show that for a short-range potential, a functional for the scattering amplitude can ...
    • Variational ground state for the periodic Anderson model 

      Bowen, Samuel P.; Mancini, Jay D. (American Institute of Physics, 1988-04-15)
      A variational calculation of the ground state of the Anderson lattice model is discussed. The calculation creates a finite Hamiltonian matrix for many_electron states, which are appropriate for the thermodynamic limit. A ...
    • Variational study of the spin-gap phase of the one-dimensional t-J model 

      Chen, Y. C.; Lee, T. K. (American Physical Society, 1996-10-01)
      We propose a correlated spin-singlet-pair wave function to describe the spin-gap phase of the one-dimensional t-J model at low density and large J/t. In addition to having singlet pairs, this wave function has a Jastrow ...
    • Viability of competing field theories for the driven lattice gas 

      Schmittmann, B.; Janssen, H. K.; Täuber, Uwe C.; Zia, R. K. P.; Leung, K. T.; Cardy, J. L. (American Physical Society, 2000-05)
      It has recently been suggested that the driven lattice gas should be described by an alternate held theory in the limit of infinite drive. We review the original and the alternate field theory, invoking several well-documented ...
    • Viability of competing field theories for the driven lattice gas 

      Schmittmann, B.; Janssen, H. K.; Täuber, Uwe C.; Zia, R. K. P.; Leung, K. T.; Cardy, J. L. (American Physical Soc, 2000-05-01)
    • Vlasov theory of plasma oscillations: linear-approximation 

      Arthur, M. D.; Greenberg, W.; Zweifel, P. F. (AIP Publishing, 1977)
      A functional analytic approach to the linearized collisionless Vlasov equation is presented utilizing a resolvent integration technique on the resolvent of the transport operator evaluated at a particular point. Formulae ...