Now showing items 460-479 of 720

  • The PdBI Arcsecond Whirlpool Survey (PAWS): Environmental dependence of giant molecular cloud properties in M51 

    Colombo, D; Hughes, A; Schinnerer, E; Meidt, SE; Leroy, AK; Pety, J; Dobbs, CL; García-Burillo, S; Dumas, G; Thompson, TA; Schuster, KF; Kramer, C (American Astronomical Society / IOP Publishing, 2014-03-20)
    Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account ...
  • Peierls-type instability and tunable band gap in functionalized graphene 

    Abanin, D.A.; Shytov, A.V.; Levitov, L.S. (American Physical Society, 2010)
    Functionalizing graphene was recently shown to have a dramatic effect on the electronic properties of this material. Here we investigate spatial ordering of adatoms driven by the RKKY-type interactions. In the ordered ...
  • Perfect imaging with positive refraction in three dimensions 

    Leonhardt, Ulf; Philbin, Thomas G. (American Physical Society, 2010)
    Maxwell's fish eye has been known to be a perfect lens within the validity range of ray optics since 1854. Solving Maxwell's equations we show that the fish-eye lens in three dimensions has unlimited resolution for ...
  • Perfect surface wave cloaks. 

    Mitchell-Thomas, R.C.; McManus, TM; Quevedo-Teruel, O; Horsley, S.A.R.; Hao, Y (American Physical Society, 2013-11-22)
    This letter presents a method for making an uneven surface behave as a flat surface. This allows an object to be concealed (cloaked) under an uneven portion of the surface, without disturbing the wave propagation on the ...
  • Perfect-fluid cylinders and walls - sources for the Levi-Civita space-time 

    Philbin, Thomas G. (Institute of Physics, 1996)
  • Persistent Magnetic Wreaths in a Rapidly Rotating Sun 

    Brown, Benjamin P.; Browning, Matthew K.; Brun, Allan Sacha; Miesch, Mark S.; Toomre, Juri (American Astronomical Society / IOP Publishing, 2010)
    When our Sun was young it rotated much more rapidly than now. Observations of young, rapidly rotating stars indicate that many possess substantial magnetic activity and strong axisymmetric magnetic fields. We conduct ...
  • Phase resonances on metal gratings of identical, equally spaced alternately tapered slits 

    Rance, Helen J.; Hamilton, Oliver K.; Sambles, J. Roy; Hibbins, Alastair P. (American Institute of Physics, 2009)
    Phase resonances are observed in the microwave response of metal transmission gratings comprised of identical but alternately orientated tapered slits. Despite each slit having identical dimensions, and being equally spaced ...
  • Phase-change technologies: from PCRAM to probe-storage to processors 

    Wright, C. David; Ashawaraya, S.; Ashwin, Peter; Aziz, Mustafa M.; Hicken, R.J.; Kohary, Krisztian; Liu, Y.; Marmier, Arnaud; Shah, P.; Vazquez Diosdado, Jorge A.; Wang, Lei (2010)
    Phase-change materials based on chalcogenide alloys, for example GeSbTe and AgInSbTe, show remarkable properties such as: the ability to be crystallized by pulses in the (hundreds of) femtoseconds region while at the same ...
  • Phase-resolved x-ray ferromagnetic resonance measurements in fluorescence yield 

    Marcham, Max K.; Keatley, Paul Steven; Neudert, A.; Hicken, R.J.; Cavill, Stuart A.; Shelford, L.R.; van der Laan, Gerrit; Telling, N.D.; Childress, J.R.; Katine, J.A.; Shafer, P.; Arenholz, E. (American Institute of Physics, 2011)
    Phase-resolved x-ray ferromagnetic resonance (XFMR) has been measured in fluorescence yield, extending the application of XFMR to opaque samples on opaque substrates. Magnetization dynamics were excited in a Co50Fe50(0.7 ...
  • PHL 1445: An eclipsing cataclysmic variable with a substellar donor near the period minimum 

    McAllister, M.J.; Littlefair, S.P.; Baraffe, I.; Dhillon, V.S.; Marsh, Tom R.; Bento, J.; Bochinski, J.; Bours, MCP; Breedt, E.; Copperwheat, C.M.; Hardy, L.K.; Kerry, P.; Parsons, S.G.; Rostron, J.W.; Sahman, D.I.; Savoury, CDJ; Tunnicliffe, R.L. (Oxford University Press, 2015-03-05)
    We present high-speed, three-colour photometry of the eclipsing dwarf nova PHL 1445, which, with an orbital period of 76.3 min, lies just below the period minimum of ~82 min for cataclysmic variable stars (CVs). Averaging ...
  • Phonon anomalies and superconductivity in the Heusler compound YPd 2Sn 

    Tütüncü, H.M.; Srivastava, G.P. (American Institute of Physics (AIP), 2014-07-07)
    We have studied the structural and electronic properties of YPd 2Sn in the Heusler structure using a generalized gradient approximation of the density functional theory and the ab initio pseudopotential method. The electronic ...
  • Photon emission induced by elastic exciton-carrier scattering in semiconductor quantum wells 

    Ouerdane, H.; Varache, R.; Portnoi, M.E.; Galbraith, I. (Springer-Verlag, 2008)
    We present a study of the elastic exciton-electron (X-e−) and exciton-hole (X-h) scattering processes in semiconductor quantum wells, including fermion exchange effects. The balance between the exciton and the free carrier ...
  • Photonic band structure and emission characteristics of a metal-backed polymeric distributed feedback laser 

    Andrew, P.; Turnbull, G. A.; Samuel, I. D. W.; Barnes, William L. (American Institute of Physics, 2002)
    Optical losses associated with the metallic contacts necessary for charge injection are an obstacle to the development of an electrically pumped polymer laser. We show that it may be possible to overcome these losses by ...
  • Photonic bandgaps for grating-coupled waveguide modes with a silver tunnel barrier 

    Chen, Z.; Hooper, Ian R.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    The optical properties of a periodically modulated photoresist waveguide structure has been explored using the Kretschmann–Raether configuration with a thin silver tunnel barrier. A detailed experimental study of how ...
  • Photonic mode dispersion of a two-dimensional distributed feedback polymer laser 

    Turnbull, G. A.; Andrew, P.; Barnes, William L.; Samuel, I. D. W. (American Physical Society, 2003)
    We present an analysis of the photonic mode dispersion of a two-dimensional (2D) distributed feedback polymer laser based on the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene]. We use a ...
  • The photospheric abundances of active binaries. I. Detailed analysis of HD 113816 (IS Vir) and HD 119285 (V851 Cen) 

    Katz, D.; Favata, F.; Aigrain, Suzanne; Micela, G. (EDP Sciences, 2003)
    The high-resolution optical spectra of the two X-ray active binaries RS CVn stars HD113816 (IS Vir) and HD119285 (V851 Cen) are analysed and their Na, Mg, Al, Si, Ca, Sc, Ti, Co and Ni contents determined, in the framework ...
  • Photospheric activity and rotation of the planet-hosting star CoRoT-4a 

    Lanza, A. F.; Aigrain, Suzanne; Messina, S.; Leto, G.; Pagano, I.; Auvergne, M.; Baglin, A.; Barge, P.; Bonomo, A. S.; Collier Cameron, A.; Cutispoto, G.; Deleuil, M.; De Medeiros, J. R.; Foing, B.; Moutou, C. (EDP Sciences, 2009)
    Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type mainsequence star (CoRoT-4a). This planetary system is of particular interest because it has an ...
  • Picosecond large angle reorientation of the magnetization in Ni81Fe19 circular thin-film elements 

    Wu, J.; Schmool, D.S.; Hughes, N.D.; Moore, J.R.; Hicken, R.J. (American Institute of Physics, 2002)
    Large angle picosecond reorientation of the magnetization has been studied in circular Ni81Fe19 thin-film elements of 30 μm diameter and 500 Å thickness by means of an optical pump–probe technique. The sample was pumped ...
  • Picosecond magnetization dynamics in nanomagnets: Crossover to nonuniform precession 

    Kruglyak, V.V.; Barman, A.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2005)
    The picosecond magnetization dynamics of arrays of square Ni88Fe12∕Co80Fe20 bilayer nanoelements were studied by optical pump-probe measurements. Experimentally observed modes were found to fall upon two branches, with a ...
  • Planet formation imager (PFI): introduction and technical considerations 

    Monnier, John D.; Kraus, Stefan; Buscher, David; Berger, J-P; Haniff, C; Ireland, M; Labadie, L; Lacour, Sylvestre; Le Coroller, H; Petrov, RG; Pott, J-U; Ridgway, S; Surdej, J; ten Brummelaar, T; Tuthill, P; van Belle, G (Society of Photo-optical Instrumentation Engineers (SPIE), 2014-07-24)
    Complex non-linear and dynamic processes lie at the heart of the planet formation process. Through numerical simulation and basic observational constraints, the basics of planet formation are now coming into focus. High ...