Enviaments recents

  • Ejection-collision orbits in the Restricted three-body problem 

    Ollé Torner, Mercè; Rodríguez del Río, Óscar; Soler Villanueva, Jaume (2018-02)
    Article
    Accés restringit per política de l'editorial
    In this paper we analyse the ejection-collision (EC) orbits of the planar restricted three body problem. Being µ¿¿¿(0, 0.5] the mass parameter, and taking the big (small) primary with mass (µ), an EC orbit will be an orbit ...
  • Estimation of synaptic conductance in the spiking regime for the McKean neuron model 

    Guillamon Grabolosa, Antoni; Prohens Sastre, Rafel; Teruel Aguilar, Antonio E.; Vich Llompart, Catalina (2017-01-01)
    Article
    Accés obert
    In this work, we aim at giving a first proof of concept to address the estimation of synaptic conductances when a neuron is spiking, a complex inverse nonlinear problem which is an open challenge in neuroscience. Our ...
  • Tails and bridges in the parabolic restricted three-body problem 

    Barrabés Vera, Esther; Cors Iglesias, Josep Maria; Garcia Taberner, Laura; Ollé Torner, Mercè (2017-01-01)
    Article
    Accés obert
    After a close encounter of two galaxies, bridges and tails can be seen between or around them. A bridge would be a spiral arm between a galaxy and its companion, whereas a tail would correspond to a long and curving set ...
  • Sequential estimation of intrinsic activity and synaptic input in single neurons by particle filtering with optimal importance density 

    Closas, Pau; Guillamon Grabolosa, Antoni (HINDAWI, 2017-12-01)
    Article
    Accés obert
    This paper deals with the problem of inferring the signals and parameters that cause neural activity to occur. The ultimate challenge being to unveil brain’s connectivity, here we focus on a microscopic vision of the ...
  • 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 ...

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