Now showing items 1-20 of 957

  • The 1 : √2 mode interaction and heteroclinic networks in Boussinesq convection 

    Podvigina, Olga; Ashwin, Peter (Elsevier, 2007)
    Methods of equivariant bifurcation theory are applied to Boussinesq convection in a plane layer with stress-free horizontal boundaries and an imposed square lattice periodicity in the horizontal directions. We consider ...
  • Accelerated diffusion in the centre of a vortex 

    Bajer, Konrad; Bassom, Andrew P.; Gilbert, Andrew D. (Cambridge University Press, 2001)
    The spiral wind-up and diffusive decay of a passive scalar in circular streamlines is considered. An accelerated diffusion mechanism operates to destroy scalar fluctuations on a time scale of order P1/3 times the turn-over ...
  • Acceleration of one-dimensional mixing by discontinuous mappings 

    Ashwin, Peter; Nicol, Matthew; Kirkby, Norman (Elsevier, 2002)
    The paper considers a simple class of models for mixing of a passive tracer into a bulk material that is essentially one dimensional. We examine the relative rates of mixing due to diffusion, stretch and fold operations ...
  • 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. ...
  • The accuracy of active shape modelling and end-plate measurements for characterising the shape of the lumbar spine in the sagittal plane 

    Ali, Ali H. A.; Cowan, Amy-Beth; Gregory, Jennifer S.; Aspden, Richard M.; Meakin, Judith R. (Taylor & Francis, 2012)
    The 2D shape of the lumbar spine in the sagittal plane can be determined from lordosis angles measured between the corresponding end-plates of the vertebral bodies or by using an active shape model (ASM) of the vertebral ...
  • Accuracy of expressions for the magnetic field of a ring head 

    Middleton, Barry K.; Aziz, Mustafa M.; Miles, J. J. (IEEE, 2000)
    The Fourier method used by Fan has produced a representation of the field of a semi-infinite pole head consisting of a simple analytical approximation (Karlqvist field) plus an infinite series of correction terms. A method ...
  • 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 

    Poole, Timothy; Bandhu, Lokeshwar; Nash, G.R. (AIP Publishing, 2015-04-02)
    The acoustoelectric current in graphene has been investigated as a function of illumination, using blue (450 nm) and red (735 nm) light-emitting diodes (LEDs), and surface acoustic wave (SAW) intensity and frequency. The ...
  • Adaptive Locally Constrained Genetic Algorithm For Least-Cost Water Distribution Network Design 

    Johns, Matthew B.; Keedwell, Edward; Savic, Dragan (IWA Publishing, 2014)
    This paper describes the development of an adaptive locally constrained genetic algorithm (ALCO-GA) and its application to the problem of least cost water distribution network design. Genetic algorithms have been used ...
  • An adaptive sliding mode differentiator for actuator oscillatory failure case reconstruction 

    Alwi, Halim; Edwards, Christopher (Elsevier, 2013)
    This paper proposes an adaptive sliding mode super-twisting differentiator which allows the gains to adapt based on the ‘quality’ of the sliding motion. A Lyapunov based analysis for the adaptive super-twisting scheme is ...
  • Addressing failure rate uncertainties of marine energy converters 

    Thies, Philipp R.; Smith, George H.; Johanning, Lars (Elsevier, 2012)
    The interest in marine renewable energy is strong, but has not led to significant commercial-scale investment and deployment, yet. To attract investors and promote the development of a marine renewable industry a clear ...
  • 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 ...
  • All-graphene photodetectors 

    Withers, Freddie; Bointon, Thomas H.; Craciun, Monica F.; Russo, Saverio (American Chemical Society, 2013)
    We investigate the optoelectronic properties of novel graphene/FeCl3-intercalated few-layer graphene (FeCl3-FLG, dubbed graphexeter) heterostructures using photovoltage spectroscopy. We observe a prominent photovoltage ...
  • An alternative calculation of the Casimir forces between birefringent plates 

    Philbin, Thomas G.; Leonhardt, Ulf (American Physical Society, 2008)
    Barash has calculated the Casimir forces between parallel birefringent plates with optical axes parallel to the plate boundaries [Izv. Vyssh. Uchebn.\ Zaved., Radiofiz., {\bf 12}, 1637 (1978)]. The interesting new feature ...
  • AMBER/VLTI observations of the B[e] star MWC 300 

    Wang, Y.; Weigelt, Gerd; Kreplin, Alexander; Hofmann, Karl-Heinz; Kraus, Stefan; Miroshnichenko, A.S.; Schertl, D.; Chelli, A.; Domiciano de Souza, A.; Massi, F.; Robbe-Dubois, S. (EDP Sciences for European Southern Observatory (ESO), 2012)
    Aims. We study the enigmatic B[e] star MWC 300 to investigate its disk and binary with milli-arcsecond-scale angular resolution. Methods. We observed MWC 300 with the VLTI/AMBER instrument in the H and K bands and ...
  • AMI-LA radio continuum observations of Spitzer c2d small clouds and cores: Perseus region 

    Scaife, Anna M.M.; Hatchell, Jennifer; Davies, Matthew; Franzen, Thomas M.O.; Grainge, Keith J.B.; Hobson, Michael P.; Hurley-Walker, Natasha; Lasenby, Anthony N.; Olamaie, Malak; Perrott, Yvette C.; Pooley, Guy G.; Rodríguez-Gonzálvez, Carmen; Saunders, Richard D.E.; Schammel, Michel P.; Scott, Paul F.; Shimwell, Timothy; Titterington, David; Waldram, Elizabeth (Oxford University Press / Royal Astronomical Society, 2011)
    We present deep radio continuum observations of the cores identified as deeply embedded young stellar objects in the Perseus molecular cloud by the Spitzer c2d programme at a wavelength of 1.8 cm with the Arcminute Microkelvin ...
  • Amplified mid-latitude planetary waves favour particular regional weather extremes 

    Screen, James A.; Simmonds, Ian (Nature Publishing Group, 2014)
    There has been an ostensibly large number of extreme weather events in the Northern Hemisphere mid-latitudes during the past decade [1]. An open question that is critically important for scientists and policy makers is ...
  • Analysis of the sign-dependent switching observed in a hybrid aligned nematic cell 

    Cornford, Stephen Leslie; Taphouse, T. S.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2009)
    An optical waveguide experiment was used to study the influence of dc electric fields on a hybrid aligned nematic liquid crystal cell. This dc switching differed from ac switching in two ways: first, the equilibrium states ...