Now showing items 517-536 of 923

  • Nanohelices as superlattices: Bloch oscillations and electric dipole transitions 

    Downing, CA; Robinson, MG; Portnoi, ME (American Physical Society, 2016-10-13)
    Subjecting a nanohelix to a transverse electric field gives rise to superlattice behavior with tunable electronic properties. We theoretically investigate such a system and find Bloch oscillations and negative differential ...
  • Nanoscale Electromagnetic Compatibility: Quantum Coupling and Matching in Nanocircuits 

    Slepyan, GY; Boag, A; Mordachev, V; Sinkevich, E; Maksimenko, S; Kuzhir, P; Miano, G; Portnoi, M.E.; Maffucci, A (Institute of Electrical and Electronics Engineers Inc., 2015-08-11)
    The paper investigates two typical electromagnetic compatibility (EMC) problems, namely, coupling and matching in nanoscale circuits composed of nano-interconnects and quantum devices in entangled state. Nano-interconnects ...
  • Nanoscale spin wave valve and phase shifter 

    Au, Y.; Dvornik, Mykola; Dmytriiev, O.; Kruglyak, V.V. (American Institute of Physics, 2012)
    We have used micromagnetic simulations to demonstrate a method for controlling the amplitude and phase of spin waves propagating inside a magnonic waveguide. The method employs a nanomagnet formed on top of a magnonic ...
  • Nanoscale switch for vortex polarization mediated by Bloch core formation in magnetic hybrid systems. 

    Wohlhüter, P; Bryan, MT; Warnicke, P; Gliga, S; Stevenson, SE; Heldt, G; Saharan, L; Suszka, AK; Moutafis, C; Chopdekar, RV; Raabe, J; Thomson, T; Hrkac, Gino; Heyderman, LJ (Nature Publishing Group: Nature Communications, 2015-08-04)
    Vortices are fundamental magnetic topological structures characterized by a curling magnetization around a highly stable nanometric core. The control of the polarization of this core and its gyration is key to the utilization ...
  • Nanoscale temperature measurements using non-equilibrium Brownian dynamics of a levitated nanosphere 

    Millen, J; Deesuwan, T; Barker, P; Anders, Janet (Nature Publishing Group, 2014-05-04)
    Einstein realized that the fluctuations of a Brownian particle can be used to ascertain the properties of its environment. A large number of experiments have since exploited the Brownian motion of colloidal particles for ...
  • Near-infrared interferometric observation of the Herbig Ae star HD 144432 with VLTI/AMBER 

    Chen, L.; Kreplin, Alexander; Wang, Y.; Weigelt, Gerd; Hofmann, Karl-Heinz; Kraus, Stefan; Schertl, D.; Lagarde, S.; Natta, A.; Petrov, R.; Robbe-Dubois, S.; Tatulli, E. (EDP Sciences for European Southern Observatory (ESO), 2012)
    Aims. We study the sub-AU-scale circumstellar environment of the Herbig Ae star HD 144432 with near-infrared VLTI/AMBER observations to investigate the structure of its inner dust disk. Methods. The interferometric ...
  • Near-Infrared Spectroscopy of the Y0 WISEP J173835.52+273258.9 and the Y1 WISE J035000.32-565830.2: the Importance of Non-Equilibrium Chemistry 

    Leggett, SK; Tremblin, P; Saumon, D; Marley, MS; Morley, CV; Amundsen, DS; Baraffe, I; Chabrier, G (American Astronomical Society, 2016-06-03)
    We present new near-infrared spectra, obtained at Gemini Observatory, for two Y dwarfs: WISE J035000.32-565830.2 (W0350) and WISEP J173835.52+273258.9 (W1738). A FLAMINGOS-2 R=540 spectrum was obtained for W0350, covering ...
  • Negative frequencies in wave propagation: A microscopic model 

    Horsley, SAR; Bugler-Lamb, S (American Physical Society, 2016-06-14)
    © 2016 American Physical Society.A change in the sign of the frequency of a wave between two inertial reference frames corresponds to a reversal of the phase velocity. Yet from the point of view of the relation E=ω, a ...
  • Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning 

    Mikhaylovskiy, Rostislav; Hendry, Euan; Kruglyak, V.V. (American Physical Society, 2010)
    We report a theory of the effective permeability of multilayered metamaterials containing thin ferromagnetic layers with magnetization pinned on either one or both surfaces. Because of the pinning and small film thickness, ...
  • New chemical scheme for studying carbon-rich exoplanet atmospheres 

    Venot, O; Hébrard, E; Agúndez, M; Decin, L; Bounaceur, R (EDP Sciences for European Southern Observatory (ESO), 2015-04-27)
    Atmospheres with a high C/O ratio are expected to contain an important quantity of hydrocarbons, including heavy molecules (with more than 2 carbon atoms). To study correctly these C-rich atmospheres, a chemical scheme ...
  • New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit 

    Baraffe, I.; Homeier, D.; Allard, F.; Chabrier, G. (EDP Sciences, 2015-03-13)
    We present new models for low-mass stars down to the hydrogen-burning limit that consistently couple atmosphere and interior structures, thereby superseding the widely used BCAH98 models. The new models include updated ...
  • A New Method for Characterizing Very-Low-Mass Companions with Low Resolution Near-Infrared Spectroscopy 

    Rice, EL; Oppenheimer, R; Zimmerman, N; Roberts, LC; Hinkley, S (IOP Publishing, 2015-05)
    We present a new and computationally efficient method for characterizing very low-mass companions using low-resolution (R ~ 30), near-infrared (YJH) spectra from high-contrast imaging campaigns with integral field spectrograph ...
  • A new way of thinking about environmental building standards: Developing and demonstrating a client-led zero-energy standard 

    Parkin, A; Mitchell, A; Coley, D (SAGE Publications, 2015-11-14)
    There are over 70 low energy and carbon standards in use around the world. None of these standards have been designed by the clients who pay for and occupy the buildings in question. In this work, the client was asked to ...
  • No evidence for intense, cold accretion on to YSOs from measurements of Li in T-Tauri stars 

    Sergison, DJ; Mayne, NJ; Naylor, T; Jeffries, RD; Bell, CPM (Oxford University Press, 2013-07-16)
    We have used medium-resolution spectra to search for evidence that proto-stellar objects accrete at high rates during their early 'assembly phase'. Models predict that depleted lithium and reduced luminosity in T-Tauri ...
  • No quantum friction between uniformly moving plates 

    Philbin, Thomas G.; Leonhardt, Ulf (Institute of Physics, 2009)
    The Casimir forces between two plates moving parallel to each other are found by calculating the vacuum electromagnetic stress tensor. The perpendicular force between the plates is modified by the motion but there is no ...
  • No Sun-like dynamo on the active star ζ Andromedae from starspot asymmetry 

    Roettenbacher, R. M.; Monnier, J. D.; Korhonen, H.; Aarnio, A. N.; Baron, F.; Che, X.; Harmon, R. O.; Kővári, Zs.; Kraus, Stefan; Schaefer, G. H.; Torres, G.; Zhao, M.; ten Brummelaar, T. A.; Sturmann, J.; Sturmann, L. (Nature Publishing Group, 2016-05-04)
    Sunspots are cool areas caused by strong surface magnetic fields inhibiting convection. Moreover, strong magnetic fields can alter the average atmospheric structure , degrading our ability to measure stellar masses and ...
  • No wide spread of stellar ages in the Orion Nebula Cluster 

    Jeffries, RD; Littlefair, SP; Naylor, T; Mayne, NJ (Oxford University Press (OUP) / Royal Astronomical Society, 2011-12-11)
    The wide luminosity dispersion seen for stars at a given effective temperature in the H-R diagrams of young clusters and star forming regions is often interpreted as due to significant (~10 Myr) spreads in stellar contraction ...
  • Noise properties of the CoRoT data. A planet-finding perspective 

    Aigrain, Suzanne; Pont, F.; Fressin, F.; Alapini, Aude; Alonso, R.; Auvergne, M.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Deeg, H. J.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Guterman, P.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Queloz, D.; Rauer, H.; Rouan, D.; Schneider, J.; Wuchterl, G.; Zucker, S. (EDP Sciences, 2009)
    In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales characteristic of planetary ...
  • Non-invasive assessment of human multifidus muscle stiffness using ultrasound shear wave elastography: A feasibility study 

    Moreau, B; Vergari, C; Gad, H; Sandoz, B; Skalli, W; Laporte, S (SAGE Publications (UK and US), 2016-05-27)
    There is a lack of numeric data for the mechanical characterization of spine muscles, especially in vivo data. The multifidus muscle is a major muscle for the stabilization of the spine and may be involved in the pathogenesis ...
  • Non-invasive biomechanical characterization of intervertebral discs by shear wave ultrasound elastography: a feasibility study. 

    Vergari, C; Rouch, P; Dubois, G; Bonneau, D; Dubousset, J; Tanter, M; Gennisson, JL; Skalli, W (Springer Verlag, 2014-12)
    OBJECTIVES: Although magnetic resonance is widely spread to assess qualitatively disc morphology, a simple method to determine reliably intervertebral disc status is still lacking. Shear wave elastography is a novel technique ...