Now showing items 1-20 of 866

  • The 2014 interferometric imaging beauty contest 

    Monnier, JD; Berger, J-P; Le Bouquin, J-B; Tuthill, PG; Wittkowski, M; Grellmann, R; Müller, A; Renganswany, S; Hummel, C; Hofmann, K-H; Schertl, D; Weigelt, G; Young, J; Buscher, D; Sanchez-Bermudez, J; Alberdi, A; Schoedel, R; Köhler, R; Soulez, F; Thiébaut, É; Kluska, J; Malbet, F; Duvert, G; Kraus, S; Kloppenborg, BK; Baron, F; de Wit, W-J; Rivinius, T; Merand, A (Society of Photo-optical Instrumentation Engineers (SPIE) -, 2014-07-24)
    Here we present the results of the 6th biennial optical interferometry imaging beauty contest. Taking advantage of a unique opportunity, the red supergiant VY CMa and the Mira variable R Car were observed in the astronomical ...
  • Ab initio calculations of surface phonons of the hydrogen-terminated Si(110)-(1 × 1) surface 

    Tütüncü, HM; Karaca, E; Srivastava, GP (Elsevier, 2015-12-21)
    A first-principles study, using a linear-response approach based on the pseudopotential method and the generalised gradient approximation, has been made to examine the phonon spectrum of the hydrogen-terminated Si(110)-(1 ...
  • Ab initio investigation of BCS-type superconductivity in LuNi2 B2 C -type superconductors 

    Tütüncü, HM; Uzunok, HY; Karaca, E; Srivastava, G.P.; Özer, S; Uur, A (American Physical Society, 2015-08-20)
    Ab initio pseudopotential calculations have been made to calculate the structural, electronic, vibrational, and superconducting properties of the borocarbide superconductors RM2B2C(R=Lu,La,Y;M=Ni,Pd,Pt). Using the electronic ...
  • Ab initio investigation of superconductivity in orthorhombic MgPtSi 

    Tütüncü, HM; Karaca, E; Srivastava, GP (Elseviert, 2016-07-15)
    We have performed an ab initio study of electronic, vibrational and superconducting properties of the orthorhombic MgPtSi by employing the density functional theory, a linear-response formalism, and the plane-wave ...
  • Absorption in dipole-lattice models of dielectrics 

    Philbin, TG; Churchill, RJ (American Physical Society, 2016-05-05)
    We develop a classical microscopic model of a dielectric. The model features nonlinear interaction terms between polarizable dipoles and lattice vibrations. The lattice vibrations are found to act as a pseudoreservoir, ...
  • Accessing the Thermal Mass above Suspended Ceilings via a Perimeter Gap: a CFD Study of Naturally Ventilated Spaces 

    Morey, Scott; Coley, David; Kershaw, Tristan (VEETECH Ltd., 2010)
    There is a growing desire to reduce peak temperatures within non-domestic buildings by accessing the thermal mass of separating floors. These floors are typically formed of concrete and can store reasonable amounts of heat. ...
  • Accretion-powered stellar winds as a solution to the stellar angular momentum problem 

    Matt, Sean P.; Pudritz, Ralph E. (American Astronomical Society, 2005-10-20)
    We compare the angular momentum extracted by a wind from a pre-main-sequence star to the torques arising from the interaction between the star and its Keplerian accretion disk. We find that the wind alone can counteract ...
  • Accretion-powered stellar winds. II. Numerical solutions for stellar wind torques 

    Matt, Sean P.; Pudritz, Ralph E. (Institute of Physics (IOP) Publishing, 2008-05-10)
    In order to explain the slow rotation observed in a large fraction of accreting pre-main-sequence stars (CTTSs), we explore the role of stellar winds in torquing down the stars. For this mechanism to be effective, the ...
  • Accretion-powered stellar winds. III. spin-equilibrium solutions 

    Matt, Sean P.; Pudritz, Ralph E., (Institute of Physics (IOP) Publishing, 2008-07-01)
    We compare the stellar wind torque calculated in a previous work (Paper II) to the spin-up and spin-down torques expected to arise from the magnetic interaction between a slowly rotating (∼10% of breakup) pre-main-sequence ...
  • Accuracy of stellar parameters of exoplanet-host stars determined from asteroseismology 

    Mulet-Marquis, C.; Baraffe, I.; Aigrain, Suzanne; Pont, F. (EDP Sciences, 2009)
    Context. In the context of the space-based mission CoRoT, devoted to asteroseismology and search for planet transits, we analyse the accuracy of fundamental stellar parameters (mass, radius, luminosity) that can be obtained ...
  • Accuracy tests of radiation schemes used in hot Jupiter global circulation models 

    Amundsen, David S.; Baraffe, I.; Tremblin, Pascal; Manners, James; Hayek, W.; Mayne, Nathan J.; Acreman, David M. (EDP Sciences for European Southern Observatory (ESO), 2014)
    The treatment of radiation transport in global circulation models (GCMs) is crucial to correctly describe Earth and exoplanet atmospheric dynamics processes. The two-stream approximation and correlated-k method are currently ...
  • An acoustic double fishnet using Helmholtz resonators 

    Murray, Alasdair R.J.; Summers, I.R.; Sambles, J. Roy; Hibbins, Alastair P. (Acoustical Society of America, 2014)
    The acoustic transmission of a closely spaced pair of patterned and perforated rigid plates is explored in air. The structure resembles an acoustic double fishnet design, with each plate modified such that the gap between ...
  • Acoustoelectric photoresponse in graphene 

    Bandhu, Lokeshwar; Nash, Geoffrey R.; Poole, Timothy (AIP Publishing, 2015-03-30)
    The acoustoelectric current in graphene has been investigated as a function of illumination, using blue (450nm) and red (735nm) light-emitting diodes (LEDs), and surface acoustic wave (SAW) intensity and frequency. The ...
  • Active absorption of electromagnetic pulses in a cavity 

    Horsley, S.A.R.; Foster, RN; Tyc, T; Philbin, Thomas G. (IOP Publishing, 2015-05-28)
    We show that a pulse of electromagnetic radiation launched into a cavity can be completely absorbed into an infinitesimal region of space, provided one has a high degree of control over the current flowing through this ...
  • Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237 

    Alvarado-Gómez, JD; Hussain, GAJ; Grunhut, J; Fares, R; Donati, J-F; Alecian, E; Kochukhov, O; Oksala, M; Morin, J; Redfield, S; Cohen, O; Drake, JJ; Jardine, M; Matt, Sean P.; Petit, P; Walter, FM (EDP Sciences, 2015-10-01)
    We analyse the magnetic activity characteristics of the planet-hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational modulation of the magnetic longitudinal field ...
  • Addendum: “The two-dimensional hydrogen atom revisited” [J. Math. Phys. 43, 4681 (2002)] 

    Parfitt, D.G.W.; Portnoi, M.E. (American Institute of Physics, 2003)
  • Addressing mathematics & statistics anxiety 

    Strawbridge, SM (Institute of Mathematics & its applications, 2015-06)
    Mathematics above all other subjects strikes real fear and anxiety in some students, these students are taken well out of their ‘comfort zone’ when confronted with mathematical content in their courses. For these students, ...
  • Adiabatic graph-state quantum computation 

    Antonio, B.; Markham, D.; Anders, Janet (Institute of Physics Publishing, 2014-11-26)
    Measurement-based quantum computation (MBQC) and holonomic quantum computation (HQC) are two very different computational methods. The computation in MBQC is driven by adaptive measurements executed in a particular order ...
  • Age Gradients in the Stellar Populations of Massive Star Forming Regions Based on a New Stellar Chronometer 

    Getman, KV; Feigelson, ED; Kuhn, MA; Broos, PS; Townsley, LK; Naylor, T; Povich, MS; Luhman, KL; Garmire, GP (American Astronomical Society, 2014-05-09)
    A major impediment to understanding star formation in massive star forming regions (MSFRs) is the absence of a reliable stellar chronometer to unravel their complex star formation histories. We present a new estimation of ...
  • Aharonov-Bohm quantum rings in high-Q microcavities 

    Alexeev, Arseny; Shelykh, I.A.; Portnoi, M.E. (American Physical Society, 2013)
    A single-mode microcavity with an embedded Aharonov-Bohm quantum ring, which is pierced by a magnetic flux and subjected to a lateral electric field, is studied theoretically. It is shown that external electric and magnetic ...