Resultados globales: 15 registros encontrados en 0.02 segundos.
Artículos, Encontrados 13 registros
Contribuciones a jornadas y congresos, Encontrados 2 registros
Artículos Encontrados 13 registros  1 - 10siguiente  ir al registro:
1.
9 p, 633.8 KB Language extinction and linguistic fronts / Isern, Neus (Universitat Autònoma de Barcelona. Departament de Prehistòria) ; Fort, Joaquim (Universitat de Girona. Departament de Física)
Language diversity has become greatly endangered in the past centuries owing to processes of language shift from indigenous languages to other languages that are seen as socially and economically more advantageous, resulting in the death or doom of minority languages. [...]
2014 - 10.1098/rsif.2014.0028
Journal of the Royal Society Interface, Vol. 11, issue 94 (May 2014)  
2.
4 p, 70.7 KB Reaction-diffusion wave fronts : multigeneration biological species under climate change / Campos, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Fort Viader, Joaquim (Universitat de Girona. Departament de Física) ; Llebot, Josep Enric, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
A generalization of reaction-diffusion models to multigeneration biological species is presented. It is based on more complex random walks than those in previous approaches. The new model is developed analytically up to infinite order. [...]
2002 - 10.1103/PhysRevE.66.062901
Physical review. E : statistical, nonlinear, and soft matter physics, Vol. 66, Number 6 (December 2002) , p. 062901/1-062901/4  
3.
7 p, 87.8 KB Dynamical features of reaction-diffusion fronts in fractals / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Campos, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Fort Viader, Joaquim (Universitat de Girona. Departament de Física)
The speed of front propagation in fractals is studied by using (i) the reduction of the reaction-transport equation into a Hamilton-Jacobi equation and (ii) the local-equilibrium approach. Different equations proposed for describing transport in fractal media, together with logistic reaction kinetics, are considered. [...]
2004 - 10.1103/PhysRevE.69.016613
Physical review. E : statistical, nonlinear, and soft matter physics, Vol. 69, Number 1 (January 2004) , p. 016613/1-016613/7  
4.
5 p, 54.3 KB Description of diffusive and propagative behavior on fractals / Campos, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort Viader, Joaquim (Universitat de Girona. Departament de Física)
The known properties of diffusion on fractals are reviewed in order to give a general outlook of these dynamic processes. After that, we propose a description developed in the context of the intrinsic metric of fractals, which leads us to a differential equation able to describe diffusion in real fractals in the asymptotic regime. [...]
2004 - 10.1103/PhysRevE.69.031115
Physical review. E : statistical, nonlinear, and soft matter physics, Vol. 69, Number 3 (March 2004) , p. 031115/1-031115/5  
5.
4 p, 52.7 KB Approximate solution to the speed of spreading viruses / Ortega Cejas, Vicente (Universitat Autònoma de Barcelona. Grup de Física Estadística) ; Fort Viader, 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  
6.
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 Viader, 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  
7.
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 Viader, 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  
8.
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 Viader, 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  
9.
4 p, 69.5 KB Speed of reaction-transport processes / Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ; Fort Viader, 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  
10.
8 p, 152.8 KB Reaction-diffusion waves of advance in the transition to agricultural economics / Fort Viader, 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  

Artículos : Encontrados 13 registros   1 - 10siguiente  ir al registro:
Contribuciones a jornadas y congresos Encontrados 2 registros  
1.
4 p, 128.0 KB Population spread and cultural transmission in Neolithic transitions / Fort, Joaquim (Universitat de Girona) ; Isern, Neus (Universitat Autònoma de Barcelona. Laboratori d'Arqueologia Quantitativa) ; Jeradino, Antonieta (Institució Milà i Fontanals) ; Rondelli, Bernardo (Institució Milà i Fontanals)
The classical wave-of-advance model is based on Fisher's equation. However, this approach leads to an unbounded wave-of-advance speed at high reproduction rates. In contrast, an integro-difference model leads to a finite upper bound for the speed, namely the maximum dispersal distance divided by the generation time. [...]
2014
Social Simulation Conference. Bellaterra, Cerdanyola del Valles, 1a : 2014  
2.
4 p, 359.4 KB Modelling cultural shift : application to language decline and extinction / Isern, Neus (Universitat Autònoma de Barcelona. Laboratori d'Arqueologia Quantitativa) ; Fort, Joaquim (Universitat de Girona. Departamanent de Física)
Cultural shift is present in many aspects of human history. Here we present a model developed to study the particular case of language shift when a minority language is in competition with another language, which is perceived by the population as being socially and economically more advantageous (Isern and Fort, J. [...]
2014
Social Simulation Conference. Bellaterra, Cerdanyola del Vallès, 1a : 2014  

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1 Fort, Joan
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