Now showing items 21-40 of 288

  • Bistability in feedback circuits as a byproduct of evolution of evolvability 

    Kuwahara, Hiroyuki; Soyer, Orkun S. (2012)
    Noisy bistable dynamics in gene regulation can underlie stochastic switching and is demonstrated to be beneficial under fluctuating environments. It is not known, however, if fluctuating selection alone can result in ...
  • Bounded real and positive real balanced truncation for infinite-dimensional systems 

    Guiver, Chris; Opmeer, Mark R. (American Institute of Mathematical Sciences, 2013)
    Bounded real balanced truncation for infinite-dimensional systems is considered. This provides reduced order finite-dimensional systems that retain bounded realness. We obtain an error bound analogous to the finite-dimensional ...
  • Bounds on the dynamics of sink populations with noisy immigration 

    Eager, Eric Alan; Guiver, Chris; Hodgson, David J.; Rebarber, Richard; Stott, Iain; Townley, Stuart (Elsevier, 2014)
    Sink populations are doomed to decline to extinction in the absence of immigration. The dynamics of sink populations are not easily modelled using the standard framework of per capita rates of immigration, because numbers ...
  • Broad range of 2050 warming from an observationally constrained large climate model ensemble 

    Rowlands, Daniel J.; Frame, David J.; Ackerley, Duncan; Aina, Tolu; Booth, Ben B.B.; Christensen, Carl; Collins, Matthew; Faull, Nicholas; Forest, Chris E.; Grandey, Benjamin S.; Gryspeerdt, Edward; Highwood, Eleanor J.; Ingram, William J.; Knight, Sylvia; Lopez, Ana; Massey, Neil; McNamara, Frances; Meinshausen, Nicolai; Piani, Claudio; Rosier, Suzanne M.; Sanderson, Benjamin M.; Smith, Leonard A.; Stone, Daithi A.; hurston, Milo; Yamazaki, Kuniko; Yamazak, Y. Hiro; Allen, Myles R. (Nature Publishing Group, 2012)
    Incomplete understanding of three aspects of the climate system—equilibrium climate sensitivity, rate of ocean heat uptake and historical aerosol forcing—and the physical processes underlying them lead to uncertainties in ...
  • Calcium-Induced Calcium Release during Action Potential Firing in Developing Inner Hair Cells 

    Iosub, Radu; Avitabile, Daniele; Grant, Lisa; Tsaneva-Atanasova, Krasimira; Kennedy, Helen J. (Biophysical Society / Elsevier, 2015)
    In the mature auditory system, inner hair cells (IHCs) convert sound-induced vibrations into electrical signals that are relayed to the central nervous system via auditory afferents. Before the cochlea can respond to normal ...
  • The carbon cycle response to ENSO: a coupled climate–carbon cycle model study 

    Jones, Chris D.; Collins, Matthew; Cox, Peter M.; Spall, Steven A. (American Meteorological Society, 2001)
    There is significant interannual variability in the atmospheric concentration of carbon dioxide (CO2) even when the effect of anthropogenic sources has been accounted for. This variability is well correlated with the El ...
  • A case study of the radiative forcing of persistent contrails evolving into contrail-induced cirrus 

    Haywood, James M.; Allan, Richard P.; Bornemann, Jorge; Forster, Piers M.; Francis, Peter N.; Milton, Sean; Radel, Gaby; Rap, Alexandru; Shine, Keith P.; Thorpe, Robert (American Geophysical Union (AGU), 2009)
    [1] The radiative forcing due to a distinct pattern of persistent contrails that form into contrail-induced cirrus near and over the UK is investigated in detail for a single case study during March 2009. The development ...
  • Caution needed when linking weather extremes to amplified planetary waves 

    Screen, James A.; Simmonds, Ian (National Academy of Sciences, 2013)
  • The central role of diminishing sea ice in recent Arctic temperature amplification 

    Screen, James A.; Simmonds, Ian (Nature Publishing Group, 2010)
    The rise in Arctic near-surface air temperatures has been almost twice as large as the global average in recent decades-a feature known as 'Arctic amplification'. Increased concentrations of atmospheric greenhouse gases ...
  • Chaos in symmetric phase oscillator networks 

    Bick, Christian; Timme, Marc; Paulikat, Danilo; Rathlev, Dirk; Ashwin, Peter (American Physical Society, 2011)
    Phase-coupled oscillators serve as paradigmatic models of networks of weakly interacting oscillatory units in physics and biology. The order parameter which quantifies synchronization so far has been found to be chaotic ...
  • Classification of robust heteroclinic cycles for vector fields in R3 with symmetry 

    Hawker, David; Ashwin, Peter (Institute of Physics, 2005)
    We consider a classification of robust heteroclinic cycles in the positive octant of R3 under the action of the symmetry group (Z2)3. We introduce a coding system to represent different classes up to a topological equivalence, ...
  • Classification of wave regimes in excitable systems with linear cross diffusion 

    Tsyganov, M. A.; Biktashev, V. N. (American Physical Society, 2014)
    We consider principal properties of various wave regimes in two selected excitable systems with linear cross diffusion in one spatial dimension observed at different parameter values. This includes fixed-shape propagating ...
  • Climate impacts of geoengineering marine stratocumulus clouds 

    Jones, Andy; Haywood, James M.; Boucher, Olivier (American Geophysical Union (AGU), 2009)
    [1] Theoretical potential geoengineering solutions to the global warming problem have recently been proposed. Here, we present an idealized study of the climate response to deliberately seeding large-scale stratocumulus ...
  • Climate impacts of the southern annular mode simulated by the CMIP3 models 

    Karpechko, Alexey Yu; Gillett, Nathan P.; Marshall, Gareth J.; Screen, James A. (American Meteorological Society, 2009)
    The southern annular mode (SAM) has a well-established impact on climate in the Southern Hemisphere. The strongest response in surface air temperature (SAT) is observed in the Antarctic, but the SAM’s area of influence ...
  • Climate–carbon cycle feedback analysis: results from the C4MIP model intercomparison 

    Friedlingstein, P.; Cox, Peter M.; Betts, R. A.; Bopp, L.; Von Bloh, W.; Brovkin, V.; Cadule, P.; Doney, S.; Eby, M.; Fung, I.; Bala, G.; John, J.; Jones, Chris D.; Joos, F.; Kato, T.; Kawamiya, M.; Knorr, W.; Lindsay, K.; Matthews, H. D.; Raddatz, T.; Rayner, P.; Reick, C.; Roeckner, E.; Schnitzler, K.-G.; Schnur, R.; Strassmann, K.; Weaver, A. J.; Yoshikawa, C.; Zeng, N. (American Meteorological Society, 2006)
    Eleven coupled climate-carbon cycle models used a common protocol to study the coupling between climate change and the carbon cycle. The models were forced by historical emissions and the Intergovernmental Panel on Climate ...
  • Cluster observations of the mid-altitude cusp under strong northward Interplanetary magnetic field 

    Hu, Renyu; Bogdanova, Yulia V.; Owen, Christopher J.; Foullon, Claire; Fazakerley, Andrew; Reme, Henri (American Geophysical Union (AGU), 2008)
    We report on a multispacecraft cusp observation lasting more than 100 min. We determine the cusp boundary motion and reveal the effect on the cusp size of the interplanetary magnetic field (IMF) changing from southward to ...
  • Comparing the degree of land–atmosphere interaction in four atmospheric general circulation models 

    Koster, Randal D.; Dirmeyer, Paul A.; Hahmann, Andrea N.; Ijpelaar, Ruben; Tyahla, Lori; Cox, Peter M.; Suarez, Max J. (American Meteorological Society, 2002)
    The strength of the coupling between the land and the atmosphere, which controls, for example, the degree to which precipitation-induced soil moisture anomalies affect the overlying atmosphere and thereby the subsequent ...
  • Comparison of the Bayesian and Randomised Decision Tree Ensembles within an Uncertainty Envelope Technique 

    Schetinin, Vitaly; Fieldsend, Jonathan E.; Partridge, Derek; Krzanowski, Wojtek J.; Everson, Richard M.; Bailey, Trevor C.; Hernandez, Adolfo (Springer, 2006)
    Multiple Classifier Systems (MCSs) allow evaluation of the uncertainty of classification outcomes that is of crucial importance for safety critical applications. The uncertainty of classification is determined by a trade-off ...
  • A Computer Simulation Study of Anatomy Induced Drift of Spiral Waves in the Human Atrium 

    Kharche, Sanjay R.; Biktasheva, I. V.; Seemann, Gunnar; Zhang, Henggui; Biktashev, V. N. (Hindawi Publishing Corporation, 2014)
    The interaction of spiral waves of excitation with atrial anatomy remains unclear. This simulation study isolates the role of atrial anatomical structures on spiral wave spontaneous drift in the human atrium. We implemented ...
  • Cone exchange transformations and boundedness of orbits 

    Ashwin, Peter; Goetz, Arek (Cambridge University Press, 2010)
    We introduce a class of two-dimensional piecewise isometries on the plane that we refer to as cone exchange transformations (CETs). These are generalizations of interval exchange transformations (IETs) to 2D unbounded ...