Exploració per tema "Equacions diferencials"

Ara es mostren els items 21-40 de 198

    • A Hamiltonian study of the stability and bifurcations for the satellite problem 

      Muñoz Lecanda, Miguel Carlos; Rodríguez Olmos, Miguel Andrés; Teixidó Román, Miguel (2015-10-01)
      Article
      Accés obert
      We study the dynamics of a rigid body in a central gravitational field modeled as a Hamiltonian system with continuous rotational symmetries following the geometric framework of Wang et al. Novelties of our work are the ...

    • A new multisymplectic unified formalism for second order classical field theories 

      Prieto Martínez, Pedro Daniel; Román Roy, Narciso (American Institute of Mathematical Sciences, 2015-06-01)
      Article
      Accés obert
      We present a new multisymplectic framework for second-order classical field theories which is based on an extension of the unified LagrangianHamiltonian formalism to these kinds of systems. This model provides a straightforward ...

    • A new subdivision algorithm for the flow propagation using polynomial algebras 

      Pérez Palau, Daniel; Gómez Muntané, Gerard; Masdemont Soler, Josep (2018-08-01)
      Article
      Accés obert
      The Jet Transport method has emerged as a powerful tool for the numerical integration of ordinary differential equations; it uses polynomial expansions to approximate the flow map associated to the differential equation ...

    • A note on the symplectic topology of b-manifolds 

      Miranda Galcerán, Eva; Martinez Torres, David; Frejlich, Pedro (2017)
      Article
      Accés obert
      Poisson manifold (M2n; ) is b-symplectic if Vn is transverse to the zero section. In this paper we apply techniques native to Symplectic Topology to address questions pertaining to b-symplectic manifolds. We pro- vide ...

    • A Parameterized multi-step Newton method for solving systems of nonlinear equations 

      Ahmad, Fayyaz; Tohidi, Emran; Carrasco, Juan A. (2016-03-01)
      Article
      Accés obert
      We construct a novel multi-step iterative method for solving systems of nonlinear equations by introducing a parameter. to generalize the multi-step Newton method while keeping its order of convergence and computational ...

    • A priori estimates for semistable solutions of semilinear elliptic equations 

      Cabré Vilagut, Xavier; Sanchón Rodellar, Manuel; Spruck, Joel (2016-02-01)
      Article
      Accés obert
      We consider positive semistable solutions u of Lu + f(u) = 0 with zero Dirichlet boundary condition, where L is a uniformly elliptic operator and f is an element of C-2 is a positive, nondecreasing, and convex nonlinearity ...

    • A singular initial value problem to construct density-equalizing maps 

      Avinyó Andrés, Albert; Solà-Morales Rubió, Joan de; València Guitart, Marta (2011-05)
      Report de recerca
      Accés obert
      The diffusion-based algorithm to produce density-equalizing maps interprets diffusion as an advection process. This algorithm uses the dynamics of a flow that is defined by an initial value problem that turns out to be ...

    • A smooth center manifold theorem which applies to some III-posed partial differential equations with unbounded nonlinearities 

      Llave Canosa, Rafael de la (2009)
      Article
      Accés restringit per política de l'editorial
      We prove the existence of a smooth center manifold for several partial differential equations, including ill posed equations with unbounded nonlinearities. We also prove smooth dependence on parameters with respect to ...

    • A survey of the hysteretic Duhem model 

      Ikhouane, Fayçal (2018-11-01)
      Article
      Accés obert
      The Duhem model is a simulacrum of a com- plex and hazy reality: hysteresis. Introduced by Pierre Duhem to provide a mathematical representation of thermodynamical irreversibility, it is used to ...

    • 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 ...

    • Ageing of an oscillator due to frequency switching 

      Bonet Revés, Carles; Jeffrey, Mike R.; Martín de la Torre, Pablo; Olm Miras, Josep Maria (2021-11-01)
      Article
      Accés obert
      If an oscillator is driven by a force that switches between two frequencies, the dynamics it exhibits depends on the precise manner of switching. Here we take a one-dimensional oscillator and consider scenarios in which ...

    • An analytical approach to codimension-2 sliding bifurcations in the dry friction oscillator 

      Martínez-Seara Alonso, M. Teresa; Guàrdia Munarriz, Marcel; Hogan, S. John (2010)
      Article
      Accés restringit per política de l'editorial
      In this paper, we analytically consider sliding bifurcations of periodic orbits in the dry-friction oscillator. The system depends on two parameters: F, which corresponds to the intensity of the friction, and ω, the ...

    • An efficient iterative method for computing deflections of Bernoulli–Euler–von Karman beams on a nonlinear elastic foundation 

      Ahmad, Fayyaz; Jang, Taek Soo; Carrasco, Juan A.; Shafiq Ur, Rehman; Ali, Zulfiqar; Ali, Nukhaze (2018-10-01)
      Article
      Accés obert
      An efficient iterative method is developed for the static analysis of large deflections of an infinite beam with variable cross-section resting on a nonlinear foundation. A pseudo spring constant is added and explicit ...

    • An introductional lecture on chaotic systems through Lorenz attractor and forced Lotka Volterra equation for interdisciplinary education 

      Kim, Jeong Geun; Haus, Benedikt; Block, Brit-Maren; Mercorelli, Paolo (Universitat Politècnica de Catalunya, 2022-09)
      Text en actes de congrés
      Accés obert
      Is it possible to predict the future? How accurate is the prediction for the future? These questions are fascinating and intriguing ones in particular for young generations who look at their future with curiosity. For a ...

    • Analytic and numerical tools for the study of quasi-periodic motions in hamiltonian systems. 

      Luque Jimenez, Alejandro (Universitat Politècnica de Catalunya, 2010-01-12)
      Tesi
      Accés obert
      És un fet ben conegut que les solucions quasi-periòdiques juguen un paper rellevant a l'hora d'entendre la dinàmica de problemes amb formulació hamiltoniana, els quals apareixen en una gran quantitat d'aplicacions en ...

    • Aproximació funcional. Interpolació pura 01 

      Vidal Seguí, Yolanda (2021-01-01)
      Audiovisual
      Accés obert
      Vídeos docents de l'assignatura Càlcul Numèric i Equacions Diferencials (Q2) a l'Escola d'Enginyeria Barcelona de Est

    • Aproximació funcional. Interpolació pura 02 

      Vidal Seguí, Yolanda (2021-01-01)
      Audiovisual
      Accés obert
      Vídeos docents de l'assignatura Càlcul Numèric i Equacions Diferencials (Q2) a l'Escola d'Enginyeria Barcelona de Est

    • Aproximació funcional. Interpolació pura 03 

      Vidal Seguí, Yolanda (2021-01-01)
      Audiovisual
      Accés obert
      Vídeos docents de l'assignatura Càlcul Numèric i Equacions Diferencials (Q2) a l'Escola d'Enginyeria Barcelona de Est

    • Aproximació funcional. Interpolació pura 04 

      Vidal Seguí, Yolanda (2021-01-01)
      Audiovisual
      Accés obert
      Vídeos docents de l'assignatura Càlcul Numèric i Equacions Diferencials (Q2) a l'Escola d'Enginyeria Barcelona de Est

    • Aproximació funcional. Mínims quadrats 

      Vidal Seguí, Yolanda (2021-01-01)
      Audiovisual
      Accés obert
      Vídeos docents de l'assignatura Càlcul Numèric i Equacions Diferencials (Q2) a l'Escola d'Enginyeria Barcelona de Est