Now showing items 245-264 of 580

  • The JCMT Gould Belt Survey: a quantitative comparison between SCUBA-2 data reduction methods 

    Mairs, S; Johnstone, D; Kirk, H; Graves, S; Buckle, J; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Hatchell, Jennifer; Jenness, T; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Salji, C; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; JCMT Gould Belt survey Team (Oxford University Press for Royal Astronomical Society, 2015-12-01)
    Performing ground-based submillimetre observations is a difficult task as the measurements are subject to absorption and emission from water vapour in the Earth's atmosphere and time variation in weather and instrument ...
  • The JCMT Gould Belt Survey: constraints on prestellar core properties in Orion A North 

    Salji, CJ; Richer, JS; Buckle, JV; Hatchell, Jennifer; Kirk, H; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Jenness, T; Johnstone, D; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Quinn, Ciara; Tisi, S; Walker-Smith, S; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Butner, H; Chen, M; Chrysostomou, A; Coude, S; Davis, CJ; Drabek-Maunder, E; Duarte-Cabral, A.; Fiege, J; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Greaves, J; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Matthews, BC; Moriarty-Schieven, G; Rawlings, J.; Robertson, D.; Rosolowsky, E.; Rumble, D.; Sadavoy, S; Thomas, H.; Tothill, N; Viti, S; White, GJ; Wilson, CD; Wouterloot, J; Yates, J; Zhu, M (Oxford University Press for Royal Astronomical Society, 2015-05-01)
    We employ SCUBA-2 (Submillimetre Common-User Bolometer Array 2) observations of the Orion A North molecular cloud to derive column density and temperature maps. We apply a novel, Hessian-based structural identification ...
  • The JCMT gould belt survey: Evidence for radiative heating in serpens MWC 297 and its influence on local star formation 

    Rumble, D.; Hatchell, Jennifer; Gutermuth, Robert A.; Kirk, H.; Buckle, J.; Beaulieu, S.F.; Berry, D.S.; Broekhoven-Fiene, H.; Currie, M.J.; Fich, M.; Jenness, T.; Johnstone, D.; Mottram, J.C.; Nutter, D.; Pattle, K.; Pineda, J.E.; Quinn, Ciara; Salji, C.; Tisi, S.; Walker-Smith, S.; Di Francesco, J.; Hogerheijde, MR; Ward-Thompson, D.; Allen, L.E.; Cieza, L.A.; Dunham, M.M.; Harvey, P.M.; Stapelfeldt, K.R.; Bastien, P.; Butner, H.; Chen, M.; Chrysostomou, A.; Coude, S.; Davis, C.J.; Drabek-Maunder, Emily R.; Duarte-Cabral, A.; Fiege, J.; Friberg, P.; Friesen, R.; Fuller, G.A.; Graves, S.; Greaves, J.; Gregson, J.; Holland, W; Joncas, G.; Kirk, J.M.; Knee, L.B.G.; Mairs, S.; Marsh, K.; Matthews, B.C.; Moriarty-Schieven, G.; Rawlings, J.; Richer, J.; Robertson, D.; Rosolowsky, E.; Sadavoy, S.I.; Thomas, H.; Tothill, N.; Viti, S.; White, G.J.; Wilson, C.D.; Wouterloot, J.; Yates, J.; Zhu, Ming (Oxford University Press for Royal Astronomical Society, 2015-02-14)
    We present SCUBA-2 450 and 850 μm observations of the Serpens MWC 297 region, part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback ...
  • The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population 

    Pattle, K; Ward-Thompson, D; Kirk, JM; White, GJ; Drabek-Maunder, E; Buckle, J; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, M; Fich, M; Hatchell, Jennifer; Kirk, H; Jenness, T; Johnstone, D; Mottram, JC (Oxford University Press for Royal Astronomical Society, 2015-06)
    In this paper, we present the first observations of the Ophiuchus molecular cloud performed as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with the SCUBA-2 instrument. We demonstrate methods ...
  • The JCMT Gould Belt Survey: SCUBA-2 observations of radiative feedback in NGC1333 

    Hatchell, Jennifer; Wilson, T.; Drabek, E.; Curtis, E.; Richer, J.; Di Francesco, J.; Ward-Thompson, D. (Oxford University Press for Royal Astronomical Society, 2013)
    We present observations of NGC 1333 from SCUBA-2 on the James Clerk Maxwell Telescope (JCMT), observed as a JCMT Gould Belt Survey pilot project during the shared risk campaign when the first of four arrays was installed ...
  • Klein backscattering and Fabry-Pérot interference in graphene heterojunctions 

    Shytov, A.V.; Rudner, M.S.; Levitov, L.S. (American Physical Society, 2008)
    We present a theory of quantum-coherent transport through a lateral p-n-p structure in graphene, which fully accounts for the interference of forward and backward scattering on the p-n interfaces. The backreflection amplitude ...
  • Klein tunneling, contact doping, and pn-interfaces in gated suspended graphene 

    Laitinen, Antti; Paraoanu, G.S.; Oksanen, Mika; Craciun, Monica F.; Russo, Saverio; Sonin, Edouard; Hakonen, Pertti (arXiv.org, 2015)
    The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by pn-interfaces between positively and negatively charged regions. By combining conductance and shot ...
  • Ks-Band Detection of Thermal Emission and Color Constraints to CoRoT-1b: A Low-Albedo Planet with Inefficient Atmospheric Energy Redistribution and a Temperature Inversion 

    Rogers, Justin C.; Apai, Daniel; Lopez-Morales, M.; Sing, David K.; Burrows, A.S. (IOP Publishing for American Astronomical Society, 2009)
    We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b from time series photometry with the ARC 3.5 m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 ± 0.042% ...
  • Label-free chemically specific imaging in planta with stimulated Raman scattering microscopy. 

    Mansfield, Jessica; Littlejohn, George R.; Seymour, Mark P.; Lind, Rob; Perfect, Sarah; Moger, Julian (American Chemical Society, 2013-05-21)
    The growing world population puts ever-increasing demands on the agricultural and agrochemical industries to increase agricultural yields. This can only be achieved by investing in fundamental plant and agrochemical research ...
  • Large amplitude magnetization dynamics and the suppression of edge modes in a single nanomagnet 

    Keatley, Paul Steven; Gangmei, Prim; Dvornik, Mykola; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Institute of Physics, 2011)
    Large amplitude magnetization dynamics of a single square nanomagnet have been studied by time-resolved Kerr microscopy. Experimental spectra revealed that only a single mode was excited for all bias field values. Micromagnetic ...
  • Leaky-wave exploration of two-stage switch-on in a nematic pi-cell 

    Ruan, Lizhen; Sambles, J. Roy (American Institute of Physics, 2005)
    The two-stage switch-on dynamics of a nematic pi-cell are explored in detail using a convergent beam fully-leaky guided mode technique. The cell shows an initial switch-on with a time scale in the range several ms to tens ...
  • Levinson's theorem and scattering phase-shift contributions to the partition function of interacting gases in two dimensions 

    Portnoi, M.E.; Galbraith, I. (American Physical Society, 1998)
    We consider scattering state contributions to the partition function of a two-dimensional (2D) plasma in addition to the bound-state sum. A partition function continuity requirement is used to provide a statistical mechanical ...
  • Light circulation and weaving in periodically patterned structures 

    Crouse, David; Jaquay, Eric; Maikal, Abdur; Hibbins, Alastair P. (American Physical Society, 2008)
    The circulation and weaving of light in one-dimensionally periodic structures as a result of the excitation of phase resonances are described. It is shown that phase resonances occur for s-polarized incident light with ...
  • Light emission through a corrugated metal film: The role of cross-coupled surface plasmon polaritons 

    Wedge, S.; Hooper, Ian R.; Sage, I.; Barnes, William L. (American Physical Society, 2004)
    We examine the phenomenon of light emission through a thin metal film that takes place via surface plasmon polaritons. Surface plasmon polariton cross coupling has recently been invoked to explain sharp features observed ...
  • Light outcoupling efficiency of top-emitting organic light-emitting diodes 

    Smith, L. H.; Wasey, J. A. E.; Barnes, William L. (American Institute of Physics, 2004)
    We report results obtained from modeling the light outcoupling efficiency of top–emitting organic light-emitting diode (OLED) structures and compare them with results from conventional substrate-emitting structures. We ...
  • Limb darkening laws for two exoplanet host stars derived from 3D stellar model atmospheres: Comparison with 1D models and HST light curve observations 

    Hayek, W.; Sing, David K.; Pont, F.; Asplund, M. (EDP Sciences for European Southern Observatory (ESO), 2012)
    We compare limb darkening laws derived from 3D hydrodynamical model atmospheres and 1D hydrostatic MARCS models for the host stars of two well-studied transiting exoplanet systems, the late-type dwarfs HD 209458 and HD ...
  • Line and continuum radiative transfer modelling of AA Tau 

    Esau, Claire F.; Harries, Tim J.; Bouvier, Jerome (Oxford University Press for Royal Astronomical Society, 2014)
    We present photometric and spectroscopic models of the Classical T Tauri star AA Tau. Photometric and spectroscopic variability present in observations of AA Tau is attributed to a magnetically induced warp in the accretion ...
  • Lipkin's conservation law, Noether's theorem, and the relation to optical helicity 

    Philbin, Thomas G. (American Physical Society, 2013)
    A simple conserved quantity for electromagnetic fields in vacuum was discovered by Lipkin in 1964. In recent years this "zilch" has been used as a measure of the chirality of light. The conservation of optical zilch is ...
  • Localization and field-periodic conductance fluctuations in trilayer graphene 

    El-Bana, MS; Wolverson, D; Horsell, D.W.; Bending, SJ (IOP Publishing, 2014-11-01)
    We have systematically studied quantum transport in a short trilayer-graphene field-effect transistor. Close to the charge neutrality point, our magnetoconductance data are well described by the theory of weak localization ...
  • Localized surface-plasmon resonances in periodic nondiffracting metallic nanoparticle and nanohole arrays 

    Parsons, J.; Hendry, Euan; Burrows, Christopher P.; Auguié, Baptiste; Sambles, J. Roy; Barnes, William L. (American Physical Society, 2009)
    We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through ...