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A new model to describe biological invasion influenced by a line with fast diffusion has been introduced by H. Berestycki, J.-M. Roquejoffre and L. Rossi in 2012.The purpose of this article is to present a related model where the line of…

Analysis of PDEs · Mathematics 2015-04-16 Antoine Pauthier

We introduce and study a class of free boundary models with "nonlocal diffusion", which are natural extensions of the free boundary models in Du and Lin [17] and elsewhere, where "local diffusion" is used to describe the population…

Analysis of PDEs · Mathematics 2018-10-11 Jiafeng Cao , Yihong Du , Fang Li , Wantong Li

We consider here a model of accelerating fronts, introduced in [2], consisting of one equation with nonlocal diffusion on a line, coupled via the boundary condition with a reaction-diffusion equation of the Fisher-KPP type in the upper…

Analysis of PDEs · Mathematics 2019-11-11 Anne-Charline Chalmin , Jean-Michel Roquejoffre

We propose here a new model of accelerating fronts, consisting of one equation with non-local diffusion on a line, coupled via the boundary condition with a reaction-diffusion equation in the upper half-plane. The underlying biological…

Analysis of PDEs · Mathematics 2015-07-01 Henri Berestycki , Anne-Charline Coulon , Jean-Michel Roquejoffre , Luca Rossi

In this paper, we investigate a Fisher-KPP nonlocal diffusion model incorporating the effect of advection and free boundaries, aiming to explore the propagation dynamics of the nonlocal diffusion-advection model. Considering the effects of…

Analysis of PDEs · Mathematics 2023-09-13 Chengcheng Cheng

This paper concerns the spreading speed and asymptotical behaviors, which was left as an open problem in \cite{LLW22}, of a Fisher-KPP nonlocal diffusion model with a free boundary. Using a new lower solution, we get the exact finite…

Analysis of PDEs · Mathematics 2024-09-25 Lei Li , Mingxin Wang

In this paper, we mainly investigate the spreading dynamics of a nonlocal diffusion KPP model with free boundaries which is firstly explored in time almost periodic media. As the spreading occurs, the long-run dynamics are obtained.…

Analysis of PDEs · Mathematics 2023-09-18 Chengcheng Cheng , Rong Yuan

In Cao, Du, Li and Li [8], a nonlocal diffusion model with free boundaries extending the local diffusion model of Du and Lin [12] was introduced and studied. For Fisher-KPP type nonlinearities, its long-time dynamical behaviour is shown to…

Analysis of PDEs · Mathematics 2020-01-28 Yihong Du , Fang Li , Maolin Zhou

We propose here a new model to describe biological invasions in the plane when a strong diffusion takes place on a line. We establish the main properties of the system, and also derive the asymptotic speed of spreading in the direction of…

Analysis of PDEs · Mathematics 2012-10-17 Henri Berestycki , Jean-Michel Roquejoffre , Luca Rossi

Incorporating free boundary into time-delayed reaction-diffusion equations yields a compatible condition that guarantees the well-posedness of the initial value problem. With the KPP type nonlinearity we then establish a vanishing-spreading…

Analysis of PDEs · Mathematics 2021-08-03 Ningkui Sun , Jian Fang

We take interest in a reaction-diffusion system which has been recently proposed [11] as a model for the effect of a road on propagation phenomena arising in epidemiology and ecology. This system consists in coupling a classical Fisher-KPP…

Analysis of PDEs · Mathematics 2015-09-08 Thomas Giletti , Léonard Monsaingeon , Maolin Zhou

Our investigation focuses on the asymptotic spreading behavior of the Fisher-KPP equation with a mixed local-nonlocal operator in the diffusion (see the work by X. Cabr\'e and J.-M. Roquejoffre, 2013, ref.[8]) to the setting of mixed…

Analysis of PDEs · Mathematics 2025-09-01 Begoña Barrios , Bryan Pichucho , Alexander Quaas

We investigate the influence of a general non-local advection term of the form K * u to propagation in the one-dimensional Fisher-KPP equation. This model is a generalization of the Keller-Segel-Fisher system. When K $\in$ L 1 (R), we…

Analysis of PDEs · Mathematics 2017-09-05 François Hamel , Christopher Henderson

We treat a model of population dynamics in a periodic environment presenting a fast diffusion line. This phenomenon is modelled via a "road-field" system, which is a system of coupled reaction-diffusion equations set in domains of different…

Analysis of PDEs · Mathematics 2020-10-01 Elisa Affili

We investigate the asymptotic speed of spread of the solutions of a non-autonomous Fisher-KPP equation with nonlocal diffusion, driven by a thin-tailed kernel. In this paper, we are concerned with both compactly supported and exponentially…

Analysis of PDEs · Mathematics 2023-08-04 Arnaud Ducrot , Zhucheng Jin

The famous Fisher-KPP reaction diffusion model combines linear diffusion with the typical Fisher-KPP reaction term, and appears in a number of relevant applications. It is remarkable as a mathematical model since, in the case of linear…

Analysis of PDEs · Mathematics 2016-07-06 Alessandro Audrito , Juan Luis Vazquez

In this paper, we propose a novel free boundary problem to model the movement of single species with a range boundary. The spatial movement and birth/death processes of the species found within the range boundary are assumed to be governed…

Analysis of PDEs · Mathematics 2022-01-13 Chunxi Feng , Mark A. Lewis , Chuncheng Wang , Hao Wang

The famous Fisher-KPP reaction-diffusion model combines linear diffusion with the typical KPP reaction term, and appears in a number of relevant applications in biology and chemistry. It is remarkable as a mathematical model since it…

Analysis of PDEs · Mathematics 2016-02-19 Alessandro Audrito , Juan Luis Vázquez

In this paper, we revisit the famous Kermack-McKendrick model with nonlocal spatial interactions by shedding new lights on associated spreading properties and we also prove the existence and uniqueness of traveling fronts. Unlike previous…

Analysis of PDEs · Mathematics 2025-06-09 Grégory Faye , Jean-Michel Roquejoffre , Mingmin Zhang

The system under study is a reaction-diffusion equation in a horizontal strip, coupled to a diffusion equation on its upper boundary via an exchange condition of the Robin type. This class of models was introduced by H. Berestycki, L. Rossi…

Analysis of PDEs · Mathematics 2016-03-16 Laurent Dietrich , Jean-Michel Roquejoffre
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