Now showing items 461-480 of 1307

  • Graded-index magnonics 

    Davies, CS; Kruglyak, VV (American Institute of Physics, 2015-10-01)
    © 2015 AIP Publishing LLC. The wave solutions of the Landau-Lifshitz equation (spin waves) are characterized by some of the most complex and peculiar dispersion relations among all waves. For example, the spin-wave ...
  • Grain boundaries in granular materials-A fundamental limit for thermal stability 

    Saharan, L; Morrison, C; Ikeda, Y; Takano, K; Miles, JJ; Thomson, T; Schrefl, T; Hrkac, G (American Institute of Physics (AIP), 2013)
    We show that thermal-stability and the associated switching field in well segregated, nanoscale granular materials is explained by grain boundary and interface effects. Grain boundaries pose a fundamental limit on scaling ...
  • Grain-size dependent demagnetizing factors in permanent magnets 

    Bance, S; Seebacher, B; Schrefl, T; Exl, L; Winklhofer, M; Hrkac, G; Zimanyi, G; Shoji, T; Yano, M; Sakuma, N; Ito, M; Kato, A; Manabe, A (American Institute of Physics (AIP), 2014)
    The coercive field of permanent magnets decreases with increasing grain size. The grain size dependence of coercivity is explained by a size dependent demagnetizing factor. In Dy free Nd$_2$Fe$_{14}$B magnets the size ...
  • Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: Detection of potassium in XO-2b from narrowband spectrophotometry 

    Sing, David K.; Desert, J.-M.; Fortney, J.J.; Lecavelier des Etangs, A.; Ballester, G.; Cepa, J.; Ehrenreich, D.; Lopez-Morales, M.; Pont, F.; Shabram, M.; Vidal-Madjar, A. (EDP Sciences, 2011)
    We present Gran Telescopio Canarias (GTC) optical transit narrowband photometry of the hot-Jupiter exoplanet XO-2b using the OSIRIS instrument. This unique instrument has the capabilities to deliver high-cadence narrowband ...
  • Grating-coupled surface plasmons at microwave frequencies 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 1999)
    This work presents a detailed investigation of electromagnetic coupling to the surface plasmon-polariton (SPP) at microwave frequencies. We have recorded the wavelength-dependent reflectivity from a metallic sinusoidal ...
  • Gratingless enhanced microwave transmission through a subwavelength aperture in a thick metal plate 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2002)
    Remarkably enhanced transmission of microwave radiation through a single subwavelength slit in a thick metallic substrate surrounded by just a pair of parallel deep and narrow grooves is recorded. By also patterning the ...
  • Gravitational torques imply molecular gas inflow towards the nucleus of M 51 

    Querejeta, M; Meidt, SE; Schinnerer, E; García-Burillo, S; Dobbs, CL; Colombo, D; Dumas, G; Hughes, A; Kramer, C; Leroy, AK; Pety, J; Schuster, KF; Thompson, TA (EDP Sciences, 2016-03-14)
    © 2016 ESO.The transport of gas towards the centre of galaxies is critical for black hole feeding and, indirectly, it can control active galactic nucleus (AGN) feedback. We have quantified the molecular gas inflow in the ...
  • Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures 

    Martínez Pancorbo, P; Ortiz de Zárate, JM; Bataller, H; Croccolo, F (EDP Sciences, 2017-02)
    We discuss the gravity effects on the dynamics of composition fluctuations in a ternary mixture around the non-equilibrium quiescent state induced by thermodiffusion when subjected to a stationary temperature gradient. ...
  • Grazing-incidence iridescence from a butterfly wing 

    Lawrence, Christopher R.; Vukusic, Peter; Sambles, J. Roy (Optical Society of America, 2002)
    The Troides magellanus butterfly exhibits a specialized iridescence that is visible only when its hind wings are both illuminated and viewed at near-grazing incidence. The effect is due to the presence of a constrained ...
  • A ground-based optical transmission spectrum of WASP-6b 

    Jordán, A; Espinoza, N; Rabus, M; Eyheramendy, S; Sing, DK; Désert, JM; Bakos, GA; Fortney, JJ; López-Morales, M; Maxted, PFL; Triaud, AHMJ; Szentgyorgyi, A (American Astronomical Society, 2013-11-13)
    We present a ground-based optical transmission spectrum of the inflated sub-Jupiter-mass planet WASP-6b. The spectrum was measured in 20 spectral channels from 480 nm to 860 nm using a series of 91 spectra over a complete ...
  • Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission 

    Deeg, H. J.; Gillon, M.; Shporer, A.; Rouan, D.; Stecklum, B.; Aigrain, Suzanne; Alapini, Aude; Almenara, J.-M.; Alonso, R.; Barbieri, M.; Bouchy, F.; Eislöffel, J.; Erikson, A.; Fridlund, M.; Eigmüller, P.; Handler, G.; Hatzes, A.; Kabath, P.; Lendl, M.; Mazeh, T.; Moutou, C.; Queloz, D.; Rauer, H.; Rabus, M.; Tingley, B.; Titz, R. (EDP Sciences, 2009)
    The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d'être arises from the much higher spatial resolution ...
  • Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b 

    Sing, David K.; Lopez-Morales, M. (EDP Sciences, 2009)
    We report on the detection of the secondary eclipse of the very-hot Jupiter OGLE-TR-56b from combined z'-band time series photometry obtained with the VLT and Magellan telescopes. We measure a flux decrement of 0.0363 ± ...
  • GTC OSIRIS transiting exoplanet atmospheric survey: detection of potassium in HAT-P-1b from narrow-band spectrophotometry 

    Wilson, Paul A.; Sing, David K.; Nikolov, N.; Lecavelier des Etangs, A.; Pont, F.; Fortney, J.J.; Ballester, G.; Desert, J.-M.; Vidal-Madjar, A. (Oxford University Press for Royal Astronomical Society, 2015-04-15)
    We present the detection of potassium in the atmosphere of HAT-P-1b using optical transit narrow-band photometry. The results are obtained using the 10.4-m Gran Telescopio Canarias together with the OSIRIS instrument in ...
  • GTC OSIRIS transiting exoplanet atmospheric survey: Detection of sodium in XO-2b from differential long-slit spectroscopy 

    Sing, David K.; Huitson, Catherine M.; Lopez-Morales, M.; Pont, F.; Desert, J.-M.; Ehrenreich, D.; Wilson, Paul A.; Ballester, G.; Fortney, J.J.; Lecavelier des Etangs, A.; Vidal-Madjar, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2012)
    We present two transits of the hot-Jupiter exoplanet XO-2b using the Gran Telescopio Canarias (GTC). The time series observations were performed using long-slit spectroscopy of XO-2 and a nearby reference star with the ...
  • The H-band Emitting Region of the Luminous Blue Variable P Cygni: Spectrophotometry and Interferometry of the Wind 

    Richardson, ND; Schaefer, GH; Gies, DR; Chesneau, O; Monnier, JD; Baron, F; Che, X; Parks, JR; Matson, RA; Touhami, Y; Clemens, DP; Aldoretta, EJ; Morrison, ND; ten Brummelaar, TA; McAlister, HA; Kraus, S; Ridgway, ST; Sturmann, J; Sturmann, L; Taylor, B; Turner, NH; Farrington, CD; Goldfinger, PJ (American Astronomical Society / IOP Publishing, 2013-05-14)
    We present the first high angular resolution observations in the near-infrared H band (1.6 μm) of the luminous blue variable star P Cygni. We obtained six-telescope interferometric observations with the CHARA Array and the ...
  • HARPS3 for a roboticized Isaac Newton telescope 

    Thompson, SJ; Queloz, D; Baraffe, I; Brake, M; Dolgopolov, A; Fisher, M; Fleury, M; Geelhoed, J; Hall, R; Hernandez, JIG; Horst, RT; Kragt, J; Navarro, R; Naylor, T; Pepe, F; Piskunov, N; Rebolo, R; Sander, L; Segransan, D; Seneta, E; Sing, D; Snellen, I; Snik, F; Spronck, J; Stempels, E; Sun, X; Tschudi, SS; Young, J (Society of Photo-optical Instrumentation Engineers (SPIE), 2016)
    We present a description of a new instrument development, HARPS3, planned to be installed on an upgraded and roboticized Isaac Newton Telescope by end-2018. HARPS3 will be a high resolution (R = 115,000) echelle spectrograph ...
  • HAT-P-26b: A Neptune-mass exoplanet with a well-constrained heavy element abundance 

    Wakeford, HR; Sing, DK; Kataria, T; Deming, D; Nikolov, N; Lopez, E; Tremblin, P; Amundsen, DS; Lewis, N; Mandell, A; Fortney, JJ; Knutson, H; Benneke, B; Evans, T (American Association for the Advancement of Science, 2017-05-12)
    A correlation between giant-planet mass and atmospheric heavy elemental abundance was first noted in the past century from observations of planets in our own Solar System and has served as a cornerstone of planet-formation ...
  • Hawking radiation and the boomerang behaviour of massive modes near a horizon 

    Jannes, Gil; Maissa, Philippe; Philbin, Thomas G.; Rousseaux, Germain (American Physical Society, 2011)
    We discuss the behaviour of massive modes near a horizon based on a study of the dispersion relation and wave packet simulations of the Klein-Gordon equation. We point out an apparent paradox between two (in principle ...
  • Hawking tunneling and boomerang behaviour of massive particles with E < m 

    Jannes, Gil; Philbin, Thomas G.; Rousseaux, Germain (American Institute of Physics, 2012)
    Massive particles are radiated from black holes through the Hawking mechanism together with the more familiar radiation of massless particles. For E ≥ m, the emission rate is identical to the massless case. But E < m ...
  • Head & neck optical diagnostics: vision of the future of surgery. 

    Upile, T; Jerjes, W; Sterenborg, HJCM; El-Naggar, AK; Sandison, A; Witjes, MJH; Biel, MA; Bigio, I; Wong, BJF; Gillenwater, A; MacRobert, AJ; Robinson, DJ; Betz, CS; Stepp, H; Bolotine, L; McKenzie, G; Mosse, CA; Barr, H; Chen, Z; Berg, K; D'Cruz, AK; Stone, N; Kendall, C; Fisher, S; Leunig, A; Olivo, M; Richards-Kortum, R; Soo, KC; Bagnato, V; Choo-Smith, L-P; Svanberg, K; Tan, IB; Wilson, BC; Wolfsen, H; Yodh, AG; Hopper, C (Open Access Publishing London, 2009-07-13)
    Review paper and Proceedings of the Inaugural Meeting of the Head and Neck Optical Diagnostics Society (HNODS) on March 14th 2009 at University College London. The aim of our research must be to provide breakthrough ...