Enviaments recents

  • Estimation of synaptic conductances in presence of nonlinear effects caused by subthreshold ionic currents 

    Vich Llompart, Catalina; Guillamon Grabolosa, Antoni; Ditlevsen, Susanne; Berg, Rune W. (2017-07)
    Article
    Accés obert
    Subthreshold fluctuations in neuronal membrane potential traces contain nonlinear components, and employing nonlinear models might improve the statistical inference. We propose a new strategy to estimate synaptic conductances, ...
  • To and fro motion for the hydrogen atom in a circularly polarized microwave field 

    Ollé Torner, Mercè (2018-01-01)
    Article
    Accés restringit per política de l'editorial
    We study the problem of the hydrogen atom interacting with a circularly polarized microwave field, and more specifically, we focus on the so called to and fro motion, that is, the erratic trajectories described by the ...
  • Gevrey estimates for one dimensional parabolic invariant manifolds of non-hyperbolic fixed points 

    Baldomá Barraca, Inmaculada; Fontich, Ernest; Martín, Pau (2017-08-01)
    Article
    Accés obert
    We study the Gevrey character of a natural parameterization of one dimensional invariant manifolds associated to a parabolic direction of fixed points of analytic maps, that is, a direction associated with an eigenvalue ...
  • Stability of the phase motion in race-track microtrons 

    Kubyshin, Yu A.; Larreal Barreto, Oswaldo; Ramírez Ros, Rafael; Martínez-Seara Alonso, M. Teresa (2017-06-15)
    Article
    Accés restringit per política de l'editorial
    We model the phase oscillations of electrons in race-track microtrons by means of an area preserving map with a fixed point at the origin, which represents the synchronous trajectory of a reference particle in the beam. ...
  • On the construction of elliptic solutions of integrable birational maps 

    Petrera, Matteo; Pfadler, Andreas; Suris, Yuri B.; Fedorov, Yuri (2017-01-01)
    Article
    Accés obert
    We present a systematic technique to find explicit solutions of birational maps, provided that these solutions are given in terms of elliptic functions. The two main ingredients are the following: (i) application of classical ...
  • Sigma-function solution to the general Somos-6 recurrence via hyperelliptic Prym varieties 

    Fedorov, Yuri; Hone, Andy (Oxford University Press, 2016-09-09)
    Article
    Accés obert
    We construct the explicit solution of the initial value problem for sequences generated by the general Somos-6 recurrence relation, in terms of the Kleinian sigma-function of genus 2. For each sequence there is an associated ...
  • Arnold diffusion for a complete family of perturbations 

    Delshams Valdés, Amadeu; Gonçalves Schaefer, Rodrigo (Springer, 2017-01-01)
    Article
    Accés obert
    In this work we illustrate the Arnold diffusion in a concrete example — the a priori unstable Hamiltonian system of 2 + 1/2 degrees of freedom H(p, q, I, f, s) = p2/2+ cos q - 1 + I2/2 + h(q, f, s; e) — proving that for ...
  • A unified approach to explain contrary effects of hysteresis and smoothing in nonsmooth systems 

    Bonet Revés, Carles; Martínez-Seara Alonso, M. Teresa; Fossas Colet, Enric; Jeffrey, Mike R. (2017-09-01)
    Article
    Accés restringit per política de l'editorial
    Piecewise smooth dynamical systems make use of discontinuities to model switching between regions of smooth evolution. This introduces an ambiguity in prescribing dynamics at the discontinuity: should the dynamics be given ...
  • Central configurations of the planar coorbial satellite problem 

    Cors Iglesias, Josep Maria; Llibre Saló, Jaume; Ollé Torner, Mercè (2004-10)
    Article
    Accés obert
    We study the planar central configurations of the 1 +n body problem where one mass is large and the other n masses are infinitesimal and equal. We find analytically all these central configurations when 2=n=4. Numerically, ...
  • Phasic firing and coincidence detection by subthreshold negative feedback: divisive or subtractive or, better, both 

    Huguet Casades, Gemma; Meng, Xiangying; Rinzel, John (2017-02-02)
    Article
    Accés obert
    Phasic neurons typically fire only for a fast-rising input, say at the onset of a step current, but not for steady or slow inputs, a property associated with type III excitability. Phasic neurons can show extraordinary ...

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