Ara es mostren els items 1-20 de 252

    • A Central Limit Theorem for inner functions 

      Nicolau Nos, Artur; Soler i Gibert, Odí (2022-06)
      Article
      Accés obert
      A Central Limit Theorem for linear combinations of iterates of an inner function is proved. The main technical tool is Aleksandrov Disintegration Theorem for Aleksandrov-Clark measures.
    • A dynamic Parrondo's paradox for continuous seasonal systems 

      Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2020-10)
      Article
      Accés obert
      We show that planar continuous alternating systems, which can be used to model systems with seasonality, can exhibit a type of Parrondo’s dynamic paradox, in which the stability of an equilibrium, common to all seasons is ...
    • A dynamic Parrondo's paradox for continuous seasonal systems 

      Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2019-11-27)
      Report de recerca
      Accés obert
      We show that planar continuous alternating systems, which can be used to model systems with seasonality, can exhibit a type of Parrondo's dynamic paradox, in which the stability of an equilibrium, common to all seasons is ...
    • A geometric mechanism of diffusion: rigorous verification in a priori unstable Hamiltonian systems 

      Delshams Valdés, Amadeu; Huguet Casades, Gemma (2011-03-01)
      Article
      Accés restringit per política de l'editorial
      In this paper we consider a representative a priori unstable Hamiltonian system with 2 + 1/2 degrees of freedom and we apply the geometric mechanism for diffusion introduced in [A. Delshams, R. de la Llave, T.M. Seara, ...
    • A KAM theorem without action-angle variables for elliptic lower dimensional tori 

      Luque Jiménez, Alejandro; Villanueva Castelltort, Jordi (2011-02)
      Article
      Accés restringit per política de l'editorial
      We study elliptic lower dimensional invariant tori of Hamiltonian systems via parametrizations. The method is based on solving iteratively the functional equations that stand for invariance and reducibility. In contrast ...
    • A methodology for obtaining asymptotic estimates for the exponentially small splitting of separatrices to whiskered tori with quadratic frequencies 

      Delshams Valdés, Amadeu; Gonchenko, Marina; Gutiérrez Serrés, Pere (2014-07)
      Report de recerca
      Accés obert
    • A new approach to the vakonomic mechanics 

      Llibre Saló, Jaume; Ramírez Ros, Rafael; Sadovskaia Nurimanova, Natalia Guennadievna (2014-11-01)
      Article
      Accés restringit per política de l'editorial
      The aim of this paper was to show that the Lagrange-d'Alembert and its equivalent the Gauss and Appel principle are not the only way to deduce the equations of motion of the nonholonomic systems. Instead of them we consider ...
    • A route to chaos in the Boros-Moll map 

      Gardini, Laura; Mañosa Fernández, Víctor; Sushko, Iryna (2018-04-18)
      Report de recerca
      Accés obert
      The Boros-Moll map appears as a subsystem of a Landen transformation associated to certain rational integrals and its dynamics is related to the convergence of them. In the paper, we study the dynamics of a one-parameter ...
    • A Route to chaos in the Boros–Moll map 

      Gardini, Laura; Mañosa Fernández, Víctor; Sushko, Iryna (2019-04)
      Article
      Accés obert
      The Boros–Moll map appears as a subsystem of a Landen transformation associated to certain rational integrals and its dynamics is related to their convergence. In the paper, we study the dynamics of a one-parameter family ...
    • A Second Order Expansion of the Separatrix Map for Trigonometric Perturbations of a Priori Unstable Systems 

      Guàrdia Munarriz, Marcel; Kaloshin, Vadim; Zhang, Jianlu (2016-11-01)
      Article
      Accés obert
      In this paper we study a so-called separatrix map introduced by Zaslavskii–Filonenko (Sov Phys JETP 27:851–857, 1968) and studied by Treschev (Physica D 116(1–2):21–43, 1998; J Nonlinear Sci 12(1):27–58, 2002), Piftankin ...
    • A study on the generation of chaos due to the presence of smale horseshoes in dynamical systems with a homoclinic orbit 

      Deulofeu Matas, Pol (Universitat Politècnica de Catalunya, 2020-07)
      Projecte Final de Màster Oficial
      Accés obert
      One of the fundamental problems in dynamical systems is the detection and characterisation of chaotic behaviours. In this work we will focus on chaos induced by what is called the Smale horseshoe. Smale horseshoes frequently ...
    • 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 obert
      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 ...
    • Abundance of attracting, repelling and elliptic periodic orbits in two-dimensional reversible maps 

      Delshams Valdés, Amadeu; Gonchenko, S.V.; Lázaro Ochoa, José Tomás; Stenkin, Oleg (2013-01-01)
      Article
      Accés obert
      We study dynamics and bifurcations of two-dimensional reversible maps having non-transversal heteroclinic cycles containing symmetric saddle fixed points. We consider one-parameter families of reversible maps unfolding ...
    • Algebraic description of Jacobians isogeneous to certain Prym varieties with polarization (1,2) 

      Fedorov, Yuri; Enolski, Viktor Z. (2014-11)
      Report de recerca
      Accés obert
      For a class of non-hyperelliptic genus 3 curves C which are 2-fold coverings of elliptic curves E, we give an explicit algebraic description of all birationally non-equivalent genus 2 curves whose Jacobians are degree 2 ...
    • An example on Lyapunov stability and linearization 

      Munhoz Rodrigues, Hildebrando; Solà-Morales Rubió, Joan de (2020-01-01)
      Article
      Accés obert
      The purpose of this paper is to present an example of a (in the Fréchet sense) discrete dynamical system in a infinite-dimensional separable Hilbert space for which the origin is an exponentially asymptotically stable ...
    • Analysis of behavior of the eigenvalues and eigenvectors of singular linear systems 

      García Planas, María Isabel; Tarragona Romero, Sonia (2012)
      Article
      Accés obert
      Let E(p)x˙ = A(p)x + B(p)u be a family of singular linear systems smoothly dependent on a vector of real parameters p = (p1, . . . , pn). In this work we construct versal deformations of the given differentiable family under ...
    • Analysis of periodic solutions of the system Janus - Epimetheus 

      Huesca Molina, Luis (Universitat Politècnica de Catalunya, 2016-07)
      Treball Final de Grau
      Accés obert
      Desenvolupament d'un model 2-dimensional per el sistema coorbital de Janus i Epimetheus al voltant de Saturn, afegint l'aplanament del planeta. Demostracio d'un teorema de simetries sobre les equacions de moviment i analisi ...
    • Analysis of the equations governing the motion of a degrading elastic solid due to diffusion of a fluid 

      Quintanilla de Latorre, Ramón; Rajagopal, Kumbakonam (2014-10)
      Article
      Accés obert
      Degradation of solids bearing load due to the infusion of moisture when exposed to the environment can leads to a decrease in their load carrying capacity and can also lead to the failure of the body from performing its ...
    • Analysis of the relative dynamics of a charged spacecraft moving under the influence of a magnetic field 

      Cheng, Yu; Gómez Muntané, Gerard; Masdemont Soler, Josep; Yuan, Jianping (2018-09-01)
      Article
      Accés obert
      We analyse a dynamical scenario where a constantly charged spacecraft (follower) moves in the vicinity of another one (leader) that follows a circular Keplerian orbit around the Earth and generates a rotating magnetic ...
    • Analytical and computational tools for the study of phase and synchrony in neural oscillators 

      Castejón Company, Oriol (Universitat Politècnica de Catalunya, 2010-10)
      Projecte Final de Màster Oficial
      Accés obert
      En aquest treball es pretén donar una visió de les aplicacions dels sistemes dinàmics en el camp de la neurociència, així com ampliar les eines que s'utilitzen fins ara. En el primer capítol es descriu el marc teòric on ...