Now showing items 25-44 of 47

  • Implementación de los métodos de Riks-Wempner, Batoz-Dhatt, Powell-Simons y otros en el programa de elementos finitos F.E.A.P 

    Sancho, Jose Maria; Ortiz, Jesús (2009-03-09T16:16:24Z)
    Article
    Open Access
    Los fundamentos teóricos del método de Riks y su utilidad para el paso de puntos límite en el análisis no lineal de estructuras, están actualmente bien establecidos, pero resta aún una importante labor de normalización y ...
  • Langevin dynamics of A+A reactions in one dimension 

    Sancho, Jose Maria; Romero, A. H.; Lacasta Palacio, Ana María; Lindenberg, Katja (IOP Publishing, 2007-02-28)
    Article
    Open Access
    We propose a set of Langevin equations of motion together with a reaction rule for the study of binary reactions. Our scheme is designed to address this problem for arbitrary friction ° and temperature T. It easily ...
  • Langevin equations with multiplicative noise: application to domain growth 

    Sancho, Jose Maria; Hernández-Machado, A.; Ramírez de la Piscina Millán, Laureano; Lacasta Palacio, Ana María (Jagiellonian University, Polish Academy of Arts and Sciences, 1993-05-01)
    Article
    Open Access
    Langevin Equations of Ginzburg--Landau form, with multiplicative noise, are proposed to study the effects of fluctuations in domain growth. These equations are derived from a coarse-grained methodology. The Cahn--Hiliard--Cook ...
  • Modelization of surface diffusion of a molecular dimer 

    Romero, A. H.; Lacasta Palacio, Ana María; Sancho, Jose Maria (American Physical Society, 2004-05-20)
    Article
    Open Access
    A simple model for a dimer molecular diffusion on a crystalline surface, as a function of temperature, is presented. The dimer is formed by two particles coupled by a quadratic potential. The dimer diffusion is modeled by ...
  • Numerical algorithm for Ginzburg-Landau equations with multiplicative noise: application to domain growth 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Hernández Machado, Aurora (The American Physical Society, 1993-07-01)
    Article
    Open Access
    We consider stochastic partial differential equations with multiplicative noise. We derive an algorithm for the computer simulation of these equations. The algorithm is applied to study domain growth of a model with a ...
  • Numerical study of A+A -> 0 and A+B ->0 reactions with inertia 

    Romero, A. H.; Lacasta Palacio, Ana María; Sancho, Jose Maria; Lindenberg, Katja (American Institute of Physics, 2007-11-30)
    Article
    Open Access
    Using numerical methods we study the annihilation reactions A + A → 0 and A + B → 0 in one and two dimensions in the presence of inertial contributions to the motion of the particles. The particles move freely following ...
  • Particle separation by external fields on periodic surfaces 

    Sancho, Jose Maria; Khoury, M.; Lindenberg, K.; Lacasta Palacio, Ana María (http://dx.doi.org/10.1063/1.478548, 2005-11-30)
    Article
    Open Access
    Particles moving on perfect periodic surfaces under the influence of external forces may move along directions that deviate from that of the force. We briefly recall previous results for transport of particles on surfaces ...
  • Pattern and velocity selection of fronts propagating in modulated media 

    Armero, J.; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (EDP Sciences, 1996-02-01)
    Article
    Open Access
    We study the problem of pattern and velocity selection of morphologically stable two-dimensional fronts propagating in a spatially modulated medium. The generic system is governed by a local equation and evolves towards a ...
  • Phase separation driven by external fluctuations 

    García Ojalvo, Jordi; Lacasta Palacio, Ana María; Sancho, Jose Maria; Toral, R. (EDP Sciences, 1998-04-30)
    Article
    Open Access
    The influence of external fluctuations in phase separation processes is analysed. These fluctuations arise from random variations of an external control parameter. A linear stability analysis of the homogeneous state ...
  • Phase separation dynamics in a concetration gradient 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Yeung, C. (EDP Sciences, 1994-08-01)
    Article
    Open Access
    Phase separation dynamics with an initially nonuniform concentration are studied. Critical and off-critical behavior is observed simultaneously. A mechanism for an expanding phase-separated region is demonstrated and the ...
  • Phase separation dynamics under stirring 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1995-08-01)
    Article
    Open Access
    Phase separation dynamics in the presence of externally imposed stirring is stuidied. The stirring is assumed independent of the concentration and it is generated with a well-defined energy spectrum. The domain growth ...
  • Physical analysis of a processive molecular motor: the conventional kinesin 

    Ciudad Álvarez, Aleix; Lacasta Palacio, Ana María; Sancho, Jose Maria (American Physical Society, 2005-09-29)
    Article
    Open Access
    We present a model that allows for the derivation of the experimentally accesible observables: spatial steps, mean velocity, stall force, useful power, efficiency and randomness, etc. as a function of the adenosine triphosphate ...
  • Sorting of mesoscopic particles driven through periodic potential landscapes 

    Lacasta Palacio, Ana María; Khoury, M.; Sancho, Jose Maria; Lindenberg, Katja (World Scientific Publishing, 2006-10-01)
    Article
    Open Access
    Sorting of colloidal particles of different sizes is of importance in the transport and delivery of such particles in biological, materials science, and other technological contexts. A successful methodology involves the ...
  • Sorting on periodic surfaces 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, A. H.; Lindenberg, K. (American Physical Society, 2005-04-29)
    Article
    Open Access
    Particles moving on crystalline surfaces and driven by external forces or ffow ffelds can acquire velocities along directions that deviate from that of the external force. This effect depends on characteristics of the ...
  • Study of a bimolecular annihilation process for coarsening reactants 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sokolov, Igor M.; Sancho, Jose Maria (American Institute of Physics, 1999-04-30)
    Article
    Open Access
    We consider the spatio-temporal behavior of the A+B→0 bimolecular reaction in a system where both reactants tend to segregate into separated phases. Our study is based on the numerical solution of a pair of reaction–diffusion ...
  • The rich phenomenology of brownian particles in nonlinear potential landscapes 

    Sancho, Jose Maria; Lacasta Palacio, Ana María (2010-09)
    Article
    Open Access
    Abstract. Non-interacting brownian particles follows Langevin equations fullfiling fluctuation–dissipation relation between friction and thermal noise. Under a linear potential (constant force) Einstein found a relation ...
  • Towards gender equity in Spanish universities: a long and unpaved road 

    Sancho, Jose Maria; Creus, A. S.; Hemosilla, P. (Global University Network for Innovation (GUNI), 2008)
    Article
    Open Access
  • Transport and diffusion on a body-centered-cubic bcc(110) surface under a constant external force 

    Lindenberg, Katja; Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, Aldo H. (SPIE--The International Society for Optical Engineering, 2005-08-31)
    Conference lecture
    Restricted access - publisher's policy
    We present a numerical study of classical particles obeying a Langevin equation moving on a solid bcc(110) surface. The particles are subject to a two dimensional periodic and symmetric potential of rectangular symmetry ...
  • Transport and diffusion on crystalline surfaces under external forces 

    Lindenberg, Katja; Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, A. H. (IOP Publishing, 2005-01-31)
    Article
    Open Access
    We present a numerical study of classical particles obeying a Langevin equation and moving on a solid crystalline surface under an external force that may either be constant or modulated by periodic oscillations. We focus ...
  • Wave competition in excitable modulated media 

    Sendiña-Nadal, I.; Gómez Gesteira, Moncho; Pérez Muñuzuri, Vicente; Pérez Villar, Vicente; Armero, J.; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1997-12-31)
    Article
    Open Access
    The propagation of an initially planar front is studied within the framework of the photosensitive Belousov- Zhabotinsky reaction modulated by a smooth spatial variation of the local front velocity in the direction perpendicular ...