Now showing items 721-729 of 729

  • Variable-phase method and Levinson's theorem in two dimensions: Application to a screened Coulomb potential 

    Portnoi, M.E.; Galbraith, I. (Elsevier, 1997)
    The variable-phase approach is applied to scattering and bound states in an attractive Coulomb potential, statically screened by a two-dimensional (2D) electron gas. A 2D formulation of Levinson's theorem is used for ...
  • Variations of the stellar initial mass function in the progenitors of massive early-type galaxies and in extreme starburst environments 

    Chabrier, G; Hennebelle, P; Charlot, P (American Astronomical Society / IOP Publishing, 2014-11-06)
    We examine variations of the stellar initial mass function (IMF) in extreme environments within the formalism derived by Hennebelle & Chabrier. We focus on conditions encountered in progenitors of massive early-type galaxies ...
  • Voltage dependent director of a homeotropic negative liquid crystal cell 

    Ruan, Lizhen; Yang, Fuzi; Sambles, J. Roy (American Institute of Physics, 2008)
    Thin layers of obliquely (60° to normal) thermally evaporated SiOx lead to homeotropic alignment of a nematic liquid crystal (LC) having negative dielectric anisotropy. Under application of an ac voltage the director, as ...
  • Water vapour in the atmosphere of a transiting extrasolar planet 

    Tinetti, Giovanna; Vidal-Madjar, A.; Liang, Mao-Chang; Beaulieu, Jean-Philippe; Yung, Yuk; Carey, Sean; Barber, Robert J.; Tennyson, Jonathan; Ribas, Ignasi; Allard, Nicole; Ballester, G.; Sing, David K.; Selsis, Frank (Nature Publishing Group, 2007)
    Water is predicted to be among the most abundant (if not the most abundant) molecular species after hydrogen in the atmospheres of close-in extrasolar giant planets ('hot Jupiters'). Several attempts have been made to ...
  • Wave propagation in complex coordinates 

    Horsley, SAR; Philbin, TG; King, CG (IOP Publishing: Hybrid Open Access, 2016-04-01)
    We give an interpretation for the use of complex spatial coordinates in electromagnetism, in terms of a family of closely related inhomogeneous media. Using this understanding we find that the phenomenon of reflection can ...
  • Waveguide arrays as plasmonic metamaterials: transmission below cutoff 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2006)
    Since the work of Ebbesen et al. [Nature (London) 391, 667 (1998)], there has been immense interest in the optical properties of subwavelength holes in metal layers. While the enhanced transmission observed is generally ...
  • Young Stellar Objects in the Gould Belt 

    Dunham, MM; Allen, LE; Evans, NJ; Broekhoven-Fiene, H; Cieza, LA; Di Francesco, J; Gutermuth, Robert A.; Harvey, P.M.; Hatchell, Jennifer; Heiderman, A; Huard, TL; Johnstone, D; Kirk, JM; Matthews, BC; Miller, JF; Peterson, DE; Young, KE (American Astronomical Society, 2015-09-01)
    We present the full catalog of Young Stellar Objects (YSOs) identified in the 18 molecular clouds surveyed by the Spitzer Space Telescope “cores to disks” (c2d) and “Gould Belt” (GB) Legacy surveys. Using standard techniques ...
  • Zero-energy states in graphene quantum dots and rings 

    Downing, C.A.; Stone, D.A.; Portnoi, M.E. (2011)
    We present exact analytical zero-energy solutions for a class of smooth-decaying potentials, showing that the full confinement of charge carriers in electrostatic potentials in graphene quantum dots and rings is indeed ...
  • α-Tocopherols modify the membrane dipole potential leading to modulation of ligand binding by P-glycoprotein 

    Davis, Sterenn; Davis, Benjamin M.; Richens, Joanna L.; Vere, Kelly-Ann; Petrov, Peter G.; Winlove, C. Peter; O'Shea, Paul (American Society for Biochemistry and Molecular Biology, 2015-08)
    α-Tocopherol (vitamin E) has attracted considerable attention as a potential protective or palliative agent. In vitro, its free radical-scavenging antioxidant action has been widely demonstrated. In vivo, however, vitamin ...