Browsing by Author "Sancho, Jose Maria"

Langevin dynamics of A+A reactions in one dimension
Sancho, Jose Maria; Romero, A. H.; Lacasta Palacio, Ana María; Lindenberg, Katja (IOP Publishing, 20070228)
Article
Open AccessWe 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 equation approach for slow dynamics in magnetic systems
Sancho, Jose Maria; Lacasta Palacio, Ana María; Torrent Serra, Maria del Carmen; García Ojalvo, Jordi; Tejeda Gómez, José Arturo (Elsevier Science, 1993)
Article
Restricted access  publisher's policyWe present a magnetic model based on a Langevin equation which exhibits slow relaxation dynamics of ln(t) type. The system is composed of magnetic particles which are under the influence of a local potential and interact ... 
Langevin equations with multiplicative noise: application to domain growth
Sancho, Jose Maria; HernándezMachado, A.; Ramírez de la Piscina Millán, Laureano; Lacasta Palacio, Ana María (Jagiellonian University, Polish Academy of Arts and Sciences, 19930501)
Article
Open AccessLangevin Equations of GinzburgLandau form, with multiplicative noise, are proposed to study the effects of fluctuations in domain growth. These equations are derived from a coarsegrained methodology. The CahnHiliardCook ... 
Modelization of surface diffusion of a molecular dimer
Romero, A. H.; Lacasta Palacio, Ana María; Sancho, Jose Maria (American Physical Society, 20040520)
Article
Open AccessA 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 GinzburgLandau equations with multiplicative noise: application to domain growth
Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria; Hernández Machado, Aurora (The American Physical Society, 19930701)
Article
Open AccessWe 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, 20071130)
Article
Open AccessUsing 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, 20051130)
Article
Open AccessParticles 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, 19960201)
Article
Open AccessWe study the problem of pattern and velocity selection of morphologically stable twodimensional 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, 19980430)
Article
Open AccessThe 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, 19940801)
Article
Open AccessPhase separation dynamics with an initially nonuniform concentration are studied. Critical and offcritical behavior is observed simultaneously. A mechanism for an expanding phaseseparated region is demonstrated and the ... 
Phase separation dynamics under stirring
Lacasta Palacio, Ana María; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 19950801)
Article
Open AccessPhase 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 welldefined 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, 20050929)
Article
Open AccessWe 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, 20061001)
Article
Open AccessSorting 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, 20050429)
Article
Open AccessParticles 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, 19990430)
Article
Open AccessWe consider the spatiotemporal 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 (201009)
Article
Open AccessAbstract. Noninteracting 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 bodycenteredcubic bcc(110) surface under a constant external force
Lindenberg, Katja; Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, Aldo H. (SPIEThe International Society for Optical Engineering, 20050831)
Conference lecture
Restricted access  publisher's policyWe 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, 20050131)
Article
Open AccessWe 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
SendiñaNadal, 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, 19971231)
Article
Open AccessThe 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 ...