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Artículos Encontrados 44 registros  inicioanterior29 - 38siguiente  ir al registro: La búsqueda tardó 0.00 segundos. 
29.
4 p, 52.7 KB Approximate solution to the speed of spreading viruses / Ortega Cejas, Vicente (Universitat Autònoma de Barcelona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física) ; Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Campos, Daniel (Universitat Autònoma de Barcelona. Departament de Física)
Recently, it has been shown that the speed of virus infections can be explained by time-delayed reaction-diffusion [J. Fort and V. Méndez, Phys. Rev. Lett. 89, 178101 (2002)], but no analytical solutions were found. [...]
2004 - 10.1103/PhysRevE.69.031909
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 69, Number 3 (March 2004) , p. 031909/1-031909/4  
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30.
6 p, 69.6 KB Analysis of fronts in reaction-dispersal processes / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Campos, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Fedotov, Sergei (University of Manchester. Institute of Science and Technology. Department of Mathematics)
The existence of traveling wave front solutions with a minimum speed selected for reaction-dispersal processes is studied. We obtain a general existence condition in terms of the waiting time and dispersal distance probability distribution functions and we detail this result for situations of ecological interest. [...]
2004 - 10.1103/PhysRevE.70.066129
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 70, Number 6 (December 2004) , p. 066129/1-066129/6  
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31.
11 p, 128.0 KB Speed of reaction-diffusion fronts in spatially heterogeneous media / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física) ; Rotstein, Horacio G. (Boston University. Department of Mathematics) ; Fedotov, Sergei (University of Manchester. Institute of Science and Technology. Department of Mathematics)
The front speed problem for nonuniform reaction rate and diffusion coefficient is studied by using singular perturbation analysis, the geometric approach of Hamilton-Jacobi dynamics, and the local speed approach. [...]
2003 - 10.1103/PhysRevE.68.041105
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 68, Number 4 (October 2003) , p. 041105/1-041105/11  
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32.
6 p, 76.3 KB Effect of initial conditions on the speed of reaction-diffusion fronts / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física) ; Pujol i Sagaró, Toni (Universitat de Girona. Departament de Física)
The effect of initial conditions on the speed of propagating fronts in reaction-diffusion equations is examined in the framework of the Hamilton-Jacobi theory. We study the transition between quenched and nonquenched fronts both analytically and numerically for parabolic and hyperbolic reaction diffusion. [...]
2003 - 10.1103/PhysRevE.67.016213
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 67, Number 1 (January 2003) , p. 016213/1-016213-6  
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33.
6 p, 94.1 KB Dispersal probability distributions and the wave-front speed problem / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Pujol i Sagaró, Toni (Universitat de Girona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física)
The speed and width of front solutions to reaction-dispersal models are analyzed both analytically and numerically. We perform our analysis for Laplace and Gaussian distribution kernels, both for delayed and nondelayed models. [...]
2002 - 10.1103/PhysRevE.65.041109
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 65, Number 4 (April 2002) , p. 041109/1-041109/6  
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34.
4 p, 55.0 KB Continuous-time random walks and traveling fronts / Fedotov, Sergei (University of Manchester. Institute of Science and Technology. Department of Mathematics) ; Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física)
We present a geometric approach to the problem of propagating fronts into an unstable state, valid for an arbitrary continuous-time random walk with a Fisher-Kolmogorov-Petrovski-Piskunov growth/reaction rate. [...]
2002 - 10.1103/PhysRevE.66.030102
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 66, Number 3 (September 2002) , p. 030102/1-030102/4  
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35.
4 p, 69.5 KB Speed of reaction-transport processes / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física)
We present an approach to determining the speed of wave-front solutions to reaction-transport processes. This method is more accurate than previous ones. This is explicitly shown for several cases of practical interest: (i) the anomalous diffusion reaction, (ii) reaction diffusion in an advective field, and (iii) time-delayed reaction diffusion. [...]
2001 - 10.1103/PhysRevE.64.011105
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 64, Number. 1 (June 2001) , p. 011105/1-011105/4  
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36.
8 p, 152.8 KB Reaction-diffusion waves of advance in the transition to agricultural economics / Fort, Joaquim (Universitat de Girona. Departament de Física) ; Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física)
In a previous paper [J. Fort and V. Méndez, Phys. Rev. Lett. 82, 867 (1999)], the possible importance of higher-order terms in a human population wave of advance has been studied. However, only a few such terms were considered. [...]
1999 - 10.1103/PhysRevE.60.5894
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 60, Number 5 (November 1999) , p. 5894-5901  
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37.
4 p, 55.5 KB Irreversible thermodynamics of Poisson processes with reaction / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort, Joaquim (Universitat de Girona. Departament de Física)
A kinetic model is derived to study the successive movements of particles, described by a Poisson process, as well as their generation. The irreversible thermodynamics of this system is also studied from the kinetic model. [...]
1999 - 10.1103/PhysRevE.60.6168
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 60, Number 5 (November 1999) , p. 6168-6171  
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38.
7 p, 162.9 KB Hyperbolic reaction-diffusion equations for a forest fire model / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Llebot, Josep Enric, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
Forest fire models have been widely studied from the context of self-organized criticality and from the ecological properties of the forest and combustion. On the other hand, reaction-diffusion equations have interesting applications in biology and physics. [...]
1997 - 10.1103/PhysRevE.56.6557
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 56, Number 6 (December 1997) , p. 6557-6563  
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Artículos : Encontrados 44 registros   inicioanterior29 - 38siguiente  ir al registro:
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