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Now showing items 290-309 of 1380

  • Devising renewable heat policy: Overview of support options 

    Connor, Peter M.; Bürger, Veit; Beurskens, Luuk; Ericsson, Karin; Egger, Christiane (Elsevier, 2013)
    Renewable energy sources of heat offer the substantial economic, environmental and social benefits associated with renewable electricity but policy to support their expansion is considerably less advanced. The potential ...
  • Devonian rift-related sedimentation and Variscan tectonics – new data on the Looe and Gramscatho basins from the resurvey of the Newquay District 

    Hollick, L.M.; Shail, R.K.; Leveridge, B.E. (The Ussher Society, 2006)
    The geological resurvey of the Newquay District (Geological Survey Sheet 346) has resulted in stratigraphical and structural revision. The Devonian successions form part of the Looe and Gramscatho basins and broadly young ...
  • Differential ellipsometric surface plasmon resonance sensors with liquid crystal polarization modulators 

    Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    Differential ellipsometric interrogation of surface plasmon (SP) resonances is a technique that gives ultrahigh sensitivity to refractive index changes, and it may provide the basis for chemical and biological sensors. In ...
  • Diffractive coupling in gold nanoparticle arrays and the effect of disorder 

    Auguié, Baptiste; Barnes, William L. (Optical Society of America, 2009)
    Two-dimensional arrays of gold nanoparticles with a periodicity commensurate with the wavelength of resonant excitation of localized plasmons have been shown to exhibit a strong long-range interaction between particles. ...
  • Diffusion and the formation of vorticity staircases in randomly strained two-dimensional vortices 

    Turner, M.R.; Bassom, Andrew P.; Gilbert, Andrew D. (Cambridge University Press, 2009)
    The spreading and diffusion of two-dimensional vortices subject to weak external random strain fields is examined. The response to such a field of given angular frequency depends on the profile of the vortex and can be ...
  • Digital clocks: simple Boolean models can quantitatively describe circadian systems 

    Akman, Ozgur E.; Watterson, Steven; Parton, Andrew; Binns, Nigel; Millar, Andrew J.; Ghazal, Peter (Royal Society, 2012)
    The gene networks that comprise the circadian clock modulate biological function across a range of scales, from gene expression to performance and adaptive behaviour. The clock functions by generating endogenous rhythms ...
  • Dirac-like plasmons in honeycomb lattices of metallic nanoparticles 

    Weick, Guillaume; Woollacott, Claire; Barnes, William L.; Hess, Ortwin; Mariani, Eros (American Physical Society, 2013)
    We consider a two-dimensional honeycomb lattice of metallic nanoparticles, each supporting a localized surface plasmon, and study the quantum properties of the collective plasmons resulting from the near-field dipolar ...
  • Direct excitation of propagating spin waves by focused ultrashort optical pulses 

    Au, Y.; Dvornik, Mykola; Davison, T.; Ahmad, E.; Keatley, Paul Steven; Vansteenkiste, A.; Van Waeyenberge, B.; Kruglyak, V.V. (American Physical Society, 2013)
    An all-optical experiment long utilized to image phonons excited by ultrashort optical pulses has been applied to a magnetic sample. In addition to circular ripples due to surface acoustic waves, we observe an X-shaped ...
  • Direct mapping of surface plasmon dispersion using imaging scatterometry 

    Hibbins, Alastair P.; Constant, Thomas J.; Lethbridge, Alfred J.; Sambles, J. Roy; Stone, Edmund K.; Vukusic, Peter (American Institute of Physics, 2013)
    The iso-frequency contours of diffracted surface plasmons on metallic bigratings have been directly recorded using imaging scatterometry. Metallic rectangular bigratings, formed of two “crossed” surface relief gratings, ...
  • Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots 

    Hendry, Euan; Koeberg, Mattijs; Wang, F.; Zhang, H.; de Mello Donegá, C.; Vanmaekelbergh, D.; Bonn, Mischa (American Physical Society, 2006)
    We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots. Time-resolved luminescence and terahertz spectroscopy reveal that the rate of hole cooling, following photoexcitation ...
  • Direct Optical Quantification of Backflow in a 90° Twisted Nematic Cell 

    Smith, N. J.; Tillin, M. D.; Sambles, J. Roy (American Physical Society, 2002)
    Optical guided mode observations of the transient director profile (optical tensor distribution) during the relaxation of a 90° twisted nematic cell directly reveals backflow. In the first 6 ms of the relaxation process, ...
  • Disciplines, geography, and gender in the framing of climate change 

    O'Neill, Saffron J.; Hulme, Mike; Turnpenny, John; Screen, James A. (American Meteorological Society, 2010)
    No abstract available
  • Discovery of a bright eclipsing cataclysmic variable 

    Sing, David K.; Green, E.M.; Howell, S.B.; Holberg, J.B.; Lopez-Morales, M.; Shaw, J.S.; Schmidt, G.D. (EDP Sciences for European Southern Observatory (ESO), 2007)
    Aims.We report on the discovery of J0644+3344 , a bright, deeply-eclipsing cataclysmic variable (CV) binary. Methods.Optical photometric and spectroscopic observations were obtained to determine the nature and characteristics ...
  • Discovery of Seven Companions to Intermediate Mass Stars with Extreme Mass Ratios in the Scorpius-Centaurus Association 

    Hinkley, Sasha; Kraus, Adam L.; Ireland, Michael J.; Cheetham, Anthony; Carpenter, John M.; Tuthill, Peter; Lacour, Sylvestre; Evans, T.M.; Haubois, Xavier (American Astronomical Society / IoP Publishing, 2015-06-04)
    We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M ∼ 1.5–4.5Me) in the Scorpius–Centaurus (Sco–Cen) Association using nonredundant aperture masking interferometry. Ournewly detected ...
  • Discrete computation using a perturbed heteroclinic network 

    Ashwin, Peter; Borresen, Jon (Elsevier, 2005)
    Transient synchronization into clusters appears in many biological and physical systems and seems to be important for computation within neural systems. In this paper we show how one can robustly and effectively perform ...
  • Dispersion of collective magnonic modes in stacks of nanoscale magnetic elements 

    Dvornik, Mykola; Kruglyak, V.V. (American Physical Society, 2011)
    We report a numerical study of the dispersion of collective magnonic modes in magnonic crystals formed by stacks of magnetostatically coupled magnetic nanoelements. The calculations reveal that the sign of the magnonic ...
  • Dispersion of surface plasmon polaritons on short-pitch metal gratings 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2002)
    The dispersion of surface plasmon polaritons (SPPs) has been calculated for short-pitch metal gratings for various depths. For gratings with depths greater than their pitch very flat SPP bands are formed in the zero-order ...
  • Distance Metric Learning with Eigenvalue Optimization 

    Ying, Yiming; Peng, Li (Microtome Publishing, 2012)
    The main theme of this paper is to develop a novel eigenvalue optimization framework for learning a Mahalanobis metric. Within this context, we introduce a novel metric learning approach called DML-eig which is shown to ...
  • Divergence of Casimir stress in inhomogeneous media 

    Simpson, William M.R.; Horsley, S.A.R.; Leonhardt, Ulf (American Physical Society, 2013)
    We examine the local behavior of the regularized stress tensor commonly used in calculations of the Casimir force for a dielectric medium inhomogeneous in one direction. It is shown that the usual expression for the stress ...
  • DMAC Fatigued Shackle 

    Vickers, Andrew; Gordelier, Tessa (University of Exeter, 2013-06-04)
    Results, photos and video footage of shackle tests at DMaC. Shackle trials conducted to determine shackle behaviour of a 2.5t rated shackle for research into mooring line reliability. Break tests and fatigue tests ...