Now showing items 168-187 of 1117

  • Conoscopic observation of director reorientation during Poiseuille flow of a nematic liquid crystal 

    Holmes, Christopher J.; Cornford, Stephen Leslie; Sambles, J. Roy (American Institute of Physics, 2009)
    Director reorientation under pressure driven (Poiseuille) flow is observed conoscopically for the liquid crystal 5CB aligned at an azimuthal angle of 45° to the direction of flow. A polyimide surface treatment (AL 1254) ...
  • The conservation value of abandoned pits and quarries in Cornwall: a report of the conference held at County Hall, Truro on 22nd March 1999 

    Spaldng, Adrian; Hartgroves, Stephen; Macadam, John; Owens, David (The Historic Environment Service, Cornwall County Council, 2002)
  • Consistency of certain constitutive relations with quantum electromagnetism 

    Horsley, S.A.R. (American Physical Society, 2011)
    Recent work by Philbin [ New J. Phys. 12 123008 (2010)] has provided a Lagrangian theory that establishes a general method for the canonical quantization of the electromagnetic field in any dispersive, lossy, linear ...
  • Constructing constrained-version of magic squares using selection hyper-heuristics 

    Kheiri, Ahmed; Özcan, Ender (Oxford University Press for BCS, The Chartered Institute for IT, 2014)
    A square matrix of distinct numbers in which every row, column and both diagonals have the same total is referred to as a magic square. Constructing a magic square of a given order is considered a difficult computational ...
  • Context-dependent interaction leads to emergent search behavior in social aggregates 

    Torney, Colin; Neufeld, Zoltan; Couzin, Iain D. (National Academy of Sciences, 2009)
    Locating the source of an advected chemical signal is a common challenge facing many living organisms. When the advecting medium is characterized by either high Reynolds number or high Peclet number, the task becomes highly ...
  • Continuous evolution of the in-plane magnetic anisotropies with thickness in epitaxial Fe films 

    Gester, M.; Daboo, C.; Hicken, R.J.; Gray, S.J.; Ercole, A.; Bland, J.A.C. (American Institute of Physics, 1996)
    We have studied the evolution of the magnetic in‐plane anisotropy in epitaxial Fe/GaAs films of both (001) and (110) orientation as a function of the Fe layer thickness using the longitudinal magneto‐optic Kerr effect and ...
  • Continuous Trait-Based Particle Swarm Optimisation (CTB-PSO) 

    Keedwell, Edward; Morley, Mark; Croft, Darren (Springer Verlag, 2012)
    In natural flocks, individuals are often of the same species, but there exists considerable variation in the traits possessed by each individual. In much the same way as humans display varied levels of aggression, ...
  • Control of scroll-wave turbulence using resonant perturbations 

    Morgan, S. W.; Biktasheva, I. V.; Biktashev, V. N. (American Physical Society, 2008)
    Turbulence of scroll waves is a sort of spatiotemporal chaos that exists in three-dimensional excitable media. Cardiac tissue and the Belousov-Zhabotinsky reaction are examples of such media. In cardiac tissue, chaotic ...
  • Control of the stop band of an acoustic double fishnet 

    Murray, Alasdair R.J.; Hendry, Euan; Summers, I.R.; Sambles, J. Roy; Hibbins, Alastair P. (Journal of the Acoustical Society of America, 2013)
    The acoustic transmittance of two closely spaced solid plates, each perforated with a square array of cylindrical holes, exhibits a band of near-perfect acoustic attenuation originating from hybridization between a resonance ...
  • Control of Transient Power during Unintentional Islanding of Microgrids 

    Issa, Walid; Abusara, Mohammad; Sharkh, Suleiman (IEEE, 2014)
    In inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone mode and to transfer seamlessly between the two modes. In grid-connected mode, the inverters control the amount of ...
  • Control-based continuation of unstable periodic orbits 

    Sieber, J.; Krauskopf, Bernd; Wagg, David; Neild, Simon; Gonzalez-Buelga, A. (American Society of Mechanical Engineers (ASME), 2011)
    We present an experimental procedure to track periodic orbits through a fold (saddle-node) bifurcation and demonstrate it with a parametrically excited pendulum experiment where the tracking parameter is the amplitude of ...
  • Controlling unstable chaos: stabilizing chimera states by feedback 

    Sieber, J.; Omel'chenko, Oleh E.; Wolfrum, Matthias (American Physical Society, 2014)
    We present a control scheme that is able to find and stabilize an unstable chaotic regime in a system with a large number of interacting particles. This allows us to track a high dimensional chaotic attractor through a ...
  • Convergence to local random attractors 

    Ashwin, Peter; Ochs, Gunter (Taylor & Francis, 2003)
    Random attractors allow one to classify qualitative and quantitative aspects of the long-time behaviour of stochastically forced systems viewed as random dynamical systems (RDS) in an analogous way to attractors for ...
  • Coronal Alfvén speed determination : consistency between seismology using AIA/SDO transverse loop oscillations and magnetic extrapolation 

    Verwichte, E.; Van Doorsselaere, T.; Foullon, Claire; White, R.S. (American Astronomical Society / IOP Publishing, 2013)
    Two transversely oscillating coronal loops are investigated in detail during a flare on the 2011 September 6 using data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. We compare two ...
  • Correlations and noise in magnetic recording media 

    Aziz, Mustafa M.; Middleton, Barry K.; Miles, J. J. (IEE-INST ELEC ENG, 2003-09)
    A theory is presented which predicts the role of interparticle correlations in determining the magnetisation power spectral densities within magnetic recording media in the absence of recorded signal magnetisation. Magnetic ...
  • Cost-efficient control of wastewater treatment plants to reduce greenhouse gas emissions 

    Sweetapple, Christine; Fu, Guangtao; Butler, David (IWA Publishing, 2014)
    This research investigates the potential of improved wastewater treatment plant control for the cost-efficient reduction of greenhouse gas (GHG) emissions, providing a detailed exploration of the decision variable search ...
  • A counterexample to "positive realness preserving model reduction with ℋ∞ norm error bounds" 

    Guiver, Chris; Opmeer, Mark R. (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    We provide a counterexample to the H∞ error bound for the difference of a positive real transfer function and its positive real balanced truncation stated in “Positive realness preserving model reduction with H∞ norm error ...
  • Countertraveling waves in rotating Rayleigh-Bénard convection. 

    Li, Ligang; Liao, X.; Zhang, Keke (American Physical Society, 2008)
    Linear and nonlinear counter-traveling waves in a fluid-filled annular cylinder with realistic no-slip boundary conditions uniformly heated from below and rotating about a vertical axis are investigated. When the gap of ...
  • Counting molecular-beam grown graphene layers 

    Plaut, Annette S.; Wurstbauer, Ulrich; Pinczuk, Aron; Garcia, Jorge M.; Pfeiffer, Loren N. (American Institute of Physics, 2013)
    We have used the ratio of the integrated intensity of graphene's Raman G peak to that of the silicon substrate's first-order optical phonon peak, accurately to determine the number of graphene layers across our molecular-beam ...
  • Coupled surface plasmon polaritons on thin metal slabs corrugated on both surfaces 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2004)
    A modelling study of the effect of coupled surface plasmon polaritons (SPPs) on the optical response of a thin metal film corrugated on both surfaces is presented. Initially the case of conformally corrugated metal films ...