Now showing items 689-708 of 1134

  • Observation of backflow in the switch-on dynamics of a hybrid aligned nematic 

    Jewell, Sharon A.; Sambles, J. Roy (American Institute of Physics, 2004)
    The optical convergent-beam technique is used to measure, in 0.3 ms steps, the response of the director in a 4.6-µm-thick ZLI-2293 filled hybrid aligned nematic cell when a 10 kHz, 7 Vrms ac voltage is applied to the cell. ...
  • Observation of ferromagnetic resonance in the time domain 

    Hicken, R.J.; Wu, J. (American Institute of Physics, 1999)
    Optical pump–probe spectroscopy has been used to observe damped ferromagnetic resonance (FMR) oscillations in thin film Fe samples. The FMR was pumped by magnetic field pulses generated by an optically triggered photoconductive ...
  • Observation of negative-frequency waves in a water tank: A classical analogue to the Hawking effect? 

    Rousseaux, Germain; Mathis, Christian; Maissa, Philippe; Philbin, Thomas G.; Leonhardt, Ulf (Institute of Physics, 2008)
    The conversion of positive-frequency waves into negative-frequency waves at the event horizon is the mechanism at the heart of the Hawking radiation of black holes. In black-hole analogues, horizons are formed for waves ...
  • Observation of noise correlated by the Hawking effect in a water tank 

    Euvé, L-P; Michel, F; Parentani, R; Philbin, TG; Rousseaux, G (merican Physical Society, 2016-09-13)
    We measured the power spectrum and two-point correlation function for the randomly fluctuating free surface on the downstream side of a stationary flow with a maximum Froude number $F_{\rm max} \approx 0.85$ reached above ...
  • Observation of T2-like coherent optical phonons in epitaxial Ge2Sb2Te5/GaSb(001) films 

    Shalini, Ashawaraya; Liu, Y.; Al-Jarah, Uday Ali Sabeeh; Srivastava, G.P.; Wright, C. David; Katmis, F.; Braun, W.; Hicken, R.J. (Nature Publishing Group, 2013)
    The phonon spectrum of Ge2Sb2Te5 is a signature of its crystallographic structure and underlies the phase transition process used in memory applications. Epitaxial materials allow coherent optical phonons to be studied in ...
  • Observation of the full 12-hour-long transit of the exoplanet HD80606b: Warm-Spitzer photometry and SOPHIE spectroscopy 

    Hebrard, G.; Desert, J.-M.; Diaz, R.F.; Boisse, I.; Bouchy, F.; Lecavelier des Etangs, A.; Moutou, C.; Ehrenreich, D.; Arnold, L.; Bonfils, X.; Delfosse, X.; Desort, M.; Eggenberger, A.; Forveille, T.; Gregorio, J.; Lagrange, A.-M.; Lovis, C.; Pepe, F.; Perrier, C.; Pont, F.; Queloz, D.; Santerne, A.; Santos, N.C.; Segransan, D.; Sing, David K.; Udry, S.; Vidal-Madjar, A. (EDP Sciences for European Southern Observatory (ESO), 2010)
    We present new observations of a transit of the 111.4-day-period exoplanet HD 80606b. Due to this long orbital period and to the orientation of the eccentric orbit (e = 0.9), HD 80606b's transits last for about 12 hours. ...
  • Observation of thickness dependence of magnetic surface anisotropy in ultrathin amorphous films. 

    Hicken, R.J.; Rado, G.T.; Xiao, G.; Chien, C.L. (American Physical Society, 1990)
    Ferromagnetic resonance (FMR) and SQUID magnetometry measurements have been made on multilayers of amorphous Fe70B30/Ag. The dependence of the magnetic surface anisotropy constant Ks on the magnetic layer thickness 2L has ...
  • An observational method to measure the relative fractions of solenoidal and compressible modes in interstellar clouds 

    Brunt, CM; Federrath, C (Oxford University Press (OUP) / Royal Astronomical Society, 2014-06-16)
    We introduce a new method for observationally estimating the fraction of momentum density (ρv) power contained in solenoidal modes (for which ∇ · ρv = 0) in molecular clouds. The method is successfully tested with numerical ...
  • An Observational Perspective of Transitional Disks 

    Espaillat, C; Muzerolle, J; Najita, J; Andrews, S; Zhu, Z; Calvet, Nuria; Kraus, Stefan; Hashimoto, J; Kraus, Adam; D Alessio, P (arXiv.org, 2014-02-27)
    Transitional disks are objects whose inner disk regions have undergone substantial clearing. The Spitzer Space Telescope produced detailed spectral energy distributions (SEDs) of transitional disks that allowed us to infer ...
  • Observed luminosity spread in young clusters and Fu Ori stars: a unified picture 

    Baraffe, I.; Vorobyov, Eduard I.; Chabrier, G. (American Astronomical Society, 2012)
    The idea that non-steady accretion during the embedded phase of protostar evolution can produce the observed luminosity spread in the Herzsprung–Russell diagram (HRD) of young clusters has recently been called into question. ...
  • Observing a quantum Maxwell demon at work 

    Cotteta, N; Jezouina, S; Landry, B; Campagne-Ibarcqa, P; Ficheuxa, Q; Anders, J; Auffèvesc, A; Azouitd, R; Rouchond, P; Huarda, B (National Academy of Sciences, 2017-07-03)
    In apparent contradiction to the laws of thermodynamics, Maxwell’s demon is able to cyclically extract work from a system in contact with a thermal bath exploiting the information about its microstate. The resolution ...
  • Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating 

    Mitchell-Thomas, RC; Quevedo-Teruel, O; Sambles, JR; Hibbins, AP (Nature Publishing Group, 2016)
    The field of transformation optics owes a lot of its fame to the concept of cloaking. While some experimental progress has been made towards free-space cloaking in three dimensions, the material properties required are ...
  • Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating 

    Mitchell-Thomas, RC; Quevedo-Teruel, O; Sambles, JR; Hibbins, AP (University of Exeter, 2016-07-21)
    Datasets for Fig 4
  • On close-in magnetized star-planet interactions 

    Strugarek, Antoine; Brun, Allan Sacha; Matt, Sean P. (French Society of Astronomy and Astrophysics, 2012)
    We present 2D magnetohydrodynamic simulations performed with the PLUTO code to model magnetized star-planet interactions. We study two simple scenarios of magnetized star-planet interactions: the unipolar and dipolar ...
  • On the creation of future probabilistic design weather years from UKCP09 

    Eames, Matthew E.; Kershaw, Tristan; Coley, David (SAGE Publications, 2011)
    Weather data are used extensively by building scientists and engineers to study the performance of their designs, help compare design alternatives and ensure compliance with building regulations. Given a changing climate, ...
  • On the diversity of magnetic interactions in close-in star-planet systems 

    Strugarek, A; Brun, AS; Matt, SP; Réville, V (American Astronomical Society, 2014-10-15)
    © 2014. The American Astronomical Society. All rights reserved..Magnetic interactions between close-in planets and their host star can play an important role in the secular orbital evolution of the planets, as well as the ...
  • On the dynamics of dust during protostellar collapse (article) 

    Bate, Matthew R.; Lorén-Aguilar, Pablo (Oxford University Press (OUP), 2016-11-07)
    The dynamics of dust and gas can be quite different from each other when the dust is poorly coupled to the gas. In protoplanetary discs, it is well known that this decoupling of the dust and gas can lead to diverse spatial ...
  • On the effects of clouds and hazes in the atmospheres of hot Jupiters: semi-analytical temperature-pressure profiles 

    Heng, Kevin; Hayek, W.; Pont, F.; Sing, David K. (Oxford University Press on behalf of the Royal Astronomical Society, 2011)
    Motivated by the work of Guillot, we present a semi-analytical formalism for calculating the temperature–pressure profiles in hot Jovian atmospheres which includes the effects of clouds/hazes and collision-induced absorption. ...
  • On the extraordinary optical transmission in parallel plate waveguides for non-TEM modes 

    Camacho, M; Boix, RR; Medina, F; Hibbins, AP; Sambles, JR (Optical Society of America (OSA), 2017-09-27)
    Extraordinary transmission has been recently measured in a parallel plate waveguide (PPWG) through a metal strip with a patterned 1-D periodic array of circular holes, the metal strip being embedded inside the PPWG. Wood’s ...
  • On the mechanism of charge transport in pentacene 

    van Laarhoven, Hendrik A.; Flipse, Cees F. J.; Koeberg, Mattijs; Bonn, Mischa; Hendry, Euan; Orlandi, G.; Jurchescu, O. D.; Palstra, T. T. M.; Troisi, A. (American Institute of Physics, 2008)
    Terahertz transient conductivity measurements are performed on pentacene single crystals, which directly demonstrate a strong coupling of charge carriers to low frequency molecular motions with energies centered around 1.1 ...