Now showing items 77-96 of 332

  • Dengue epidemic early warning system for Brazil 

    Lowe, Rachel; Rodo, X.; Barcellos, Christovam; Carvalho; Coelho, Caio A.S.; Bailey, Trevor C.; Jupp, Tim E.; Stephenson, David B.; Coelho, G.E.; Graham, Richard J.; Ramalho, W.M. (UNISDR Scientific and Technical Advisory Group, 2015)
    The problem Brazil has reported more cases of dengue fever than anywhere else in the world this century1. Many cities have tropical and sub-tropical climate conditions that allow the dengue mosquito to thrive during warmer, ...
  • Dependency of global mean precipitation on surface temperature 

    Lambert, F. Hugo; Webb, Mark J. (American Geophysical Union (AGU), 2008)
    We investigate the causes of temperature dependent changes in global precipitation in contemporary General Circulation Models (GCMs) subjected to a doubling of atmospheric CO2 concentration. By analyzing the energy budget ...
  • Designing the dynamics of globally coupled oscillators 

    Orosz, Gábor; Moehlis, Jeff; Ashwin, Peter (Oxford University Press, 2009)
    A method for designing cluster states with prescribed stability is presented for coupled phase oscillator systems with all-to-all coupling. We determine criteria for the coupling function that ensure the existence and ...
  • Detection of ultra-long-period oscillations in an EUV filament 

    Foullon, Claire; Verwichte, E.; Nakariakov, V.M. (EDP Sciences, 2004)
    We report the first detection of long-period (8-27 h) oscillatory intensity variations in a coronal filament. The filament is observed continuously as it crosses the solar disk in a 12-min-cadence SoHO/EIT 195 Å uninterrupted ...
  • The development of an early warning system for climate-sensitive disease risk with a focus on dengue epidemics in Southeast Brazil 

    Lowe, Rachel; Bailey, Trevor C.; Stephenson, David B.; Jupp, Tim E.; Graham, Richard J.; Barcellos, Christovam; Carvalho, Marilia Sa (2013)
    Previous studies demonstrate statistically significant associations between disease and climate variations, highlighting the potential for developing climate-based epidemic early warning systems. However, limitations include ...
  • 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 ...
  • 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
  • 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 ...
  • Double circulant constructions of the Leech lattice 

    Chapman, Robin (Cambridge University Press (CUP), 2000)
  • Dramatic interannual changes of perennial Arctic sea ice linked to abnormal summer storm activity 

    Screen, James A.; Simmonds, Ian; Keay, Kevin (American Geophysical Union, 2011)
    The perennial (September) Arctic sea ice cover exhibits large interannual variability, with changes of over a million square kilometers from one year to the next. Here we explore the role of changes in Arctic cyclone ...
  • Drift of scroll waves in thin layers caused by thickness features: asymptotic theory and numerical simulations 

    Biktasheva, I. V.; Dierckx, H.; Biktashev, V. N. (American Physical Society, 2015)
    A scroll wave in a very thin layer of excitable medium is similar to a spiral wave, but its behavior is affected by the layer geometry. We identify the effect of sharp variations of the layer thickness, which is separate ...
  • Dual Trigger of Transverse Oscillations in a Prominence by EUV Fast and Slow Coronal Waves: SDO/AIA and STEREO/EUVI Observations 

    Gosain, S.; Foullon, Claire (American Astronomical Society / IOP Publishing, 2012)
    We analyze flare-associated transverse oscillations in a quiescent solar prominence on 2010 September 8-9. Both the flaring active region and the prominence were located near the west limb, with a favorable configuration ...
  • Dynamics of coupled cell networks: synchrony, heteroclinic cycles and inflation 

    Aguiar, M.; Ashwin, Peter; Dias, A.; Field, M. (Springer Verlag, 2011)
    We consider the dynamics of small networks of coupled cells. We usually assume asymmetric inputs and no global or local symmetries in the network and consider equivalence of networks in this setting; that is, when two ...
  • Dynamics of filaments of scroll waves 

    Biktashev, V. N.; Biktasheva, I. V. (World Scientific, 2014)
    The following sections are included: A Brief History and Motivation; Wave-Particle Duality of Spiral Waves; Perturbative Dynamics of Scrolls, and Tension of Filaments; Scroll Wave Turbulence; Rigidity of Scroll Filaments: ...
  • Dynamics of the nearly parametric pendulum 

    Horton, B.; Sieber, J.; Thompson, J.M.; Wiercigroch, M. (Elsevier, 2011)
  • Dynamics of two laterally coupled semiconductor lasers: strong- and weak-coupling theory. 

    Erzgraber, H.; Wieczorek, Sebastian; Krauskopf, Bernd (American Physical Society, 2008)
    The stability and nonlinear dynamics of two semiconductor lasers coupled side to side via evanescent waves are investigated by using three different models. In the composite-cavity model, the coupling between the lasers ...
  • Dynamics on networks of cluster states for globally coupled phase oscillators 

    Ashwin, Peter; Orosz, Gábor; Wordsworth, John; Townley, Stuart (Society for Industrial and Applied Mathematics, 2007)
    Systems of globally coupled phase oscillators can have robust attractors that are heteroclinic networks. We investigate such a heteroclinic network between partially synchronized states where the phases cluster into three ...
  • Effective diffusion of scalar fields in a chaotic flow 

    Turner, M. R.; Gilbert, Andrew D.; Thuburn, John (American Institute of Physics, 2008)
    The advection of a tracer field in a fluid flow can create complex scalar structures and increase the effect of weak diffusion by orders of magnitude. One tool to quantify this is to measure the flux of scalar across contour ...
  • Effects of frozen soil on soil temperature, spring infiltration, and runoff: results from the PILPS 2(d) experiment at Valdai, Russia 

    Luo, Lifeng; Robock, Alan; Vinnikov, Konstantin Y.; Schlosser, C. Adam; Slater, Andrew G.; Boone, Aaron; Braden, Harald; Cox, Peter M.; De Rosnay, Patricia; Dickinson, Robert E.; Dai, Yongjiu; Duan, Qingyun; Etchevers, Pierre; Henderson-Sellers, Ann; Gedney, Nicola; Gusev, Yevgeniy M.; Habets, Florence; Kim, Jinwon; Kowalczyk, Eva; Mitchell, Ken; Nasonova, Olga N.; Noilhan, Joel; Pitman, Andrew; Schaake, John; Shmakin, Andrey B.; Smirnova, Tatiana G.; Wetzel, Peter; Xue, Yongkang; Yang, Zong-Liang; Zeng, Qing-Cun (American Meteorological Society, 2009-12-18)
    The Project for Intercomparison of Land-Surface Parameterization Schemes phase 2(d) experiment at Valdai, Russia, offers a unique opportunity to evaluate land surface schemes, especially snow and frozen soil parameterizations. ...