Now showing items 90-109 of 472

  • Direct Optical Quantification of Backflow in a 90° Twisted Nematic Cell 

    Smith, N. J.; Tillin, M. D.; Sambles, J. Roy (American Physical Society, 2002)
    Optical guided mode observations of the transient director profile (optical tensor distribution) during the relaxation of a 90° twisted nematic cell directly reveals backflow. In the first 6 ms of the relaxation process, ...
  • Discovery of a bright eclipsing cataclysmic variable 

    Sing, David K.; Green, E.M.; Howell, S.B.; Holberg, J.B.; Lopez-Morales, M.; Shaw, J.S.; Schmidt, G.D. (EDP Sciences for European Southern Observatory (ESO), 2007)
    Aims.We report on the discovery of J0644+3344 , a bright, deeply-eclipsing cataclysmic variable (CV) binary. Methods.Optical photometric and spectroscopic observations were obtained to determine the nature and characteristics ...
  • Dispersion of collective magnonic modes in stacks of nanoscale magnetic elements 

    Dvornik, Mykola; Kruglyak, V.V. (American Physical Society, 2011)
    We report a numerical study of the dispersion of collective magnonic modes in magnonic crystals formed by stacks of magnetostatically coupled magnetic nanoelements. The calculations reveal that the sign of the magnonic ...
  • Dispersion of surface plasmon polaritons on short-pitch metal gratings 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2002)
    The dispersion of surface plasmon polaritons (SPPs) has been calculated for short-pitch metal gratings for various depths. For gratings with depths greater than their pitch very flat SPP bands are formed in the zero-order ...
  • Divergence of Casimir stress in inhomogeneous media 

    Simpson, William M.R.; Horsley, S.A.R.; Leonhardt, Ulf (American Physical Society, 2013)
    We examine the local behavior of the regularized stress tensor commonly used in calculations of the Casimir force for a dielectric medium inhomogeneous in one direction. It is shown that the usual expression for the stress ...
  • Domain-wall pinning, nonadiabatic spin-transfer torque, and spin-current polarization in permalloy wires doped with vanadium 

    Lepadatu, S.; Claydon, J.S.; Kinane, C.J.; Charlton, T.R.; Langridge, Sean; Potenza, A.; Dhesi, Sarnjeet S.; Keatley, Paul Steven; Hicken, R.J.; Hickey, B.J.; Marrows, C.H. (American Physical Society, 2010)
    Using pulsed-current measurements we investigate the domain-wall depinning via spin-transfer torque from pinning potentials in V-doped Ni80Fe20 wires. The domain-wall depinning boundary, showing the variation of threshold ...
  • Double-period zero-order metal gratings as effective selective absorbers 

    Tan, W.-C.; Sambles, J. Roy; Preist, T. W. (American Physical Society, 2000)
    The electromagnetic response of a zero-order metal grating having a primary deep short-period component and a shallow long-period component is modeled. It is found that such a metal grating has an unusual surface-plasmon-polariton ...
  • Dynamic configurational anisotropy in nanomagnets 

    Kruglyak, V.V.; Keatley, Paul Steven; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2007)
    The angular dependence of ultrafast magnetization dynamics in nanomagnets of square shape was studied by magneto-optical pump-probe measurements. In agreement with micromagnetic simulations, both the number of precessional ...
  • Dynamic control of visible radiation by a liquid crystal filled Fabry-Pérot etalon 

    Jewell, Sharon A.; Cornford, Stephen Leslie; Sambles, J. Roy (American Institute of Physics, 2007)
    A liquid crystal filled Fabry-Pérot etalon has been constructed to control the resonant transmission of electromagnetic radiation over the visible range of the spectrum. This has been achieved through the use of a 1.5 µm ...
  • Dynamical process of switch-off in a supertwisted nematic cell 

    Yang, Fuzi; Dong, Youmei; Ruan, Lizhen; Sambles, J. Roy (American Institute of Physics, 2004)
    The switch-off dynamics of a 180° supertwisted nematic (STN) are explored in detail by using a convergent beam system and the fully leaky guided-mode technique. From the dynamical guided-mode data and using the Ericksen–Leslie ...
  • The Earth as an extrasolar transiting planet: Earth's atmospheric composition and thickness revealed by Lunar eclipse observations 

    Vidal-Madjar, A.; Arnold, L.; Ehrenreich, D.; Ferlet, R.; Lecavelier des Etangs, A.; Bouchy, F.; Segransan, D.; Boisse, I.; Hebrard, G.; Moutou, C.; Desert, J.-M.; Sing, David K.; Cabanac, R.; Nitschelm, C.; Bonfils, X.; Delfosse, X.; Desort, M.; Diaz, R.F.; Eggenberger, A.; Forveille, T.; Lagrange, A.-M.; Lovis, C.; Pepe, F.; Perrier, C.; Pont, F.; Santos, N.C.; Udry, S. (EDP Sciences for European Southern Observatory (ESO), 2010)
    Context. An important goal within the quest for detecting an Earth-like extrasolar planet, will be to identify atmospheric gaseous bio-signatures. Aims. Observations of the light transmitted through the Earth’s atmosphere, ...
  • The effect of episodic accretion on the phase transition of CO and CO2 in low-mass star formation 

    Vorobyov, Eduard I.; Baraffe, I.; Harries, Tim J.; Chabrier, G. (EDP Sciences for European Southern Observatory (ESO), 2013)
    We study the evaporation and condensation of CO and CO_2 during the embedded stages of low-mass star formation by using numerical simulations. We focus on the effect of luminosity bursts, similar in magnitude to FUors and ...
  • Effect of episodic accretion on the structure and the lithium depletion of low-mass stars and planet-hosting stars 

    Baraffe, I.; Chabrier, G. (EDP Sciences, 2010)
    Following up our recent analysis devoted to the impact of non steady accretion on the location of young low-mass stars or brown dwarfs in the Herzsprung-Russell diagram, we perform a detailed analysis devoted to the effect ...
  • Effect of hydroperoxides on red blood cell membrane mechanical properties 

    Hale, John P.; Winlove, C. Peter; Petrov, Peter G. (Biophysical Society, 2011)
    We investigate the effect of oxidative stress on red blood cell membrane mechanical properties in vitro using detailed analysis of the membrane thermal fluctuation spectrum. Two different oxidants, the cytosol-soluble ...
  • The effect of magnetic fields on star cluster formation 

    Price, Daniel J.; Bate, Matthew R. (Oxford University Press / Royal Astronomical Society, 2008)
    We examine the effect of magnetic fields on star cluster formation by performing simulations following the self-gravitating collapse of a turbulent molecular cloud to form stars in ideal magnetohydrodynamics. The collapse ...
  • The Effect of Magnetic Topology on Thermally-Driven Wind: Towards a General Formulation of the Braking Law 

    Reville, Victor; Brun, Allan Sacha; Matt, Sean P.; Strugarek, Antoine; Pinto, Rui F. (American Astronomical Society, 2015)
    Stellar wind is thought to be the main process responsible for the spin down of main-sequence stars. The extraction of angular momentum by a magnetized wind has been studied for decades, leading to several formulations for ...
  • Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer 

    Hendry, Euan; Schins, Juleon M.; Candeias, L. P.; Siebbeles, L. D. A.; Bonn, Mischa (American Physical Society, 2004)
    We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge ...
  • Efficiency of radiative emission from thin films of a light-emitting conjugated polymer 

    Wasey, J. A. E.; Safanov, A.; Samuel, I. D. W.; Barnes, William L. (American Physical Society, 2001)
    We examine the efficiency of radiative emission from thin layers of light-emitting conjugated polymers. We compare our experimental results for photoluminescence of the conjugated polymer poly(2-methoxy, 5-(2′-ethyl-hexyloxy) ...
  • Efficient coupling of surface plasmon polaritons to radiation using a bi-grating 

    Worthing, P. T.; Barnes, William L. (American Institute of Physics, 2001)
    A nanostructured surface in the form of a bi-grating is shown to efficiently couple surface plasmon polaritons to free-space radiation in the visible part of the spectrum. Coupling was achieved for all propagation directions ...
  • Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS large area survey data release 1 

    Lodieu, N.; Pinfield, D.J.; Leggett, S.K.; Jameson, R.F.; Mortlock, D.J.; Warren, S.J.; Burningham, B.; Lucas, P.W.; Chiu, K.; Liu, M.C.; Venemans, B.P.; McMahon, R.G.; Allard, F.; Baraffe, I.; Navascue, D.B.Y.; Carraro, G.; Casewell, S.L.; Chabrier, G.; Chappelle, R.J.; Clarke, F.; Day-Jones, A.C.; Deacon, N.R.; Dobbie, P.D.; Folkes, S.L.; Hambly, N.C.; Hewett, P.C.; Hodgkin, S.T.; Jones, H.R.A.; Kendall, T.R.; Magazzu, A.; Martin, E.L.; McCaughrean, M.J.; Nakajima, T.; Pavlenko, Y.; Tamura, M.; Tinney, C.G.; Osorio, M.R.Z. (Oxford University Press for Royal Astronomical Society, 2007)
    We present eight new T4.5-T7.5 dwarfs identified in the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) Data Release 1 (DR1). In addition we have recovered the T4.5 dwarf ...