DCDS-B
The reaction-diffusion system for an SIR epidemic model with a free boundary
Haomin Huang Mingxin Wang
The reaction-diffusion system for an $SIR$ epidemic model with a free boundary is studied. This model describes a transmission of diseases. The existence, uniqueness and estimates of the global solution are discussed first. Then some sufficient conditions for the disease vanishing are given. With the help of investigating the long time behavior of solution to the initial and boundary value problem in half space, the long time behavior of the susceptible population $S$ is obtained for the disease vanishing case.
keywords: long time behavior. Reaction-diffusion systems SIR model dynamics free boundary
DCDS
Existence, uniqueness, and stability of bubble solutions of a chemotaxis model
Xin Lai Xinfu Chen Mingxin Wang Cong Qin Yajing Zhang
Existence, uniqueness, and stability of Heaviside function like solutions of a Keller and Segel's minimal chemotaxis model are established when a chemotaxis parameter is large enough. Asymptotic expansions of the solution in terms of the large chemotaxis parameter are also derived.
keywords: chemotaxis. asymptotic expansion stability uniqueness Existence eigenvalue
DCDS
Some remarks for a modified periodic Camassa-Holm system
Guangying Lv Mingxin Wang
This paper is concerned with a modified two-component periodic Camassa-Holm system. The local well-posedness and low regularity result of solution are established by using the techniques of pseudoparabolic regularization and some priori estimates derived from the equation itself. A wave-breaking for strong solutions and several results of blow-up solution with certain initial profiles are described. In addition, the initial boundary value problem for a modified two-component periodic Camassa-Holm system is also considered.
keywords: Wave breaking. Periodic Two-component Camassa-Holm system Blow-up Local well posedness
DCDS
Properties of blow-up solutions to a parabolic system with nonlinear localized terms
Huiling Li Mingxin Wang
This paper deals with blow-up properties of the solution to a semi-linear parabolic system with nonlinear localized sources involved in a product with local terms, subject to the null Dirichlet boundary condition. We investigate the influence of localized sources and local terms on blow-up properties for this system. It will be proved that: (i) when $m, q\leq 1$ this system possesses uniform blow-up profiles. In other words, the localized terms play a leading role in the blow-up profile for this case. (ii) when $m, q>1$, this system presents single point blow-up patterns, or say that, in this time, local terms dominate localized terms in the blow-up profile. Moreover, the blow-up rate estimates in time and space are obtained, respectively.
keywords: blow-up rate estimate. uniform blow-up profile nonlinear local terms single point blow-up pattern nonlinear localized sources Parabolic system
DCDS-B
Existence, uniqueness and stability of traveling wave fronts of discrete quasi-linear equations with delay
Guangying Lv Mingxin Wang
This paper is concerned with the existence, uniqueness and asymptotically stability of traveling wave fronts of discrete quasi-linear equations with delay. We first establish the existence of traveling wave fronts by using the super-sub solution and monotone iteration technique. Then we show that the traveling wave front is unique up to a translation. At last, we employ the comparison principle and the squeezing technique to prove that the traveling wave front is globally asymptotic stable with phase shift.
keywords: Existence; Uniqueness; Stability; Traveling wave fronts; Discrete quasi-linear equations; Delay.
DCDS
Qualitative analysis of a diffusive variable-territory prey-predator model
Mingxin Wang Peter Y. H. Pang
In this paper, we study the variable-territory prey-predator model. We first establish the global stability of the unique positive constant steady state for the ODE system and the reaction diffusion system, and then prove the existence, uniqueness and stability of positive stationary solutions for the heterogeneous environment case.
keywords: prey-predator model variable-territory heterogeneous environment stationary solution stability
DCDS
Non-existence of global solutions for nonlinear strongly damped hyperbolic systems
Fuqin Sun Mingxin Wang
In this paper, we focus on the Cauchy problems of nonlinear strongly damped hyperbolic equations and systems. We give some conditions on the non-existence of global solutions.
keywords: strongly damped global solutions non-existence. Hyperbolic systems
CPAA
An integral equation involving Bessel potentials on half space
Yonggang Zhao Mingxin Wang
In this article we consider the following integral equation involving Bessel potentials on a half space $\mathbb{R}^n_+ $: \begin{eqnarray} u(x)=\int_{ \mathbb{R}^n_+ }\{g_\alpha(x-y)-g_\alpha(\bar x-y)\} u^\beta(y) dy,\;\;x\in \mathbb{R}^n_+, \end{eqnarray} where $\alpha>0$, $\beta>1$, $\bar x$ is the reflection of $x$ about $x_n=0$, and $g_\alpha(x)$ denotes the Bessel kernel. We first enhance the regularity of positive solutions for the integral equation by regularity-lifting-method, which has been extensively used by many authors. Then, employing the method of moving planes in integral forms, we demonstrate that there is no positive solution for the integral equation.
keywords: nonexistence. monotonicity moving plane method half space regularity Integral equation Bessel potential
DCDS-B
Dynamical properties of a Leslie-Gower prey-predator model with strong Allee effect in prey
Wenjie Ni Mingxin Wang

This paper is devoted to study the dynamical properties of a Leslie-Gower prey-predator system with strong Allee effect in prey. We first gives some estimates, and then study the dynamical properties of solutions. In particular, we mainly investigate the unstable and stable manifolds of the positive equilibrium when the system has only one positive equilibrium.

keywords: Leslie-Gower prey-predator model Allee effect dynamical properties
DCDS
Dynamics for the diffusive Leslie-Gower model with double free boundaries
Mingxin Wang Qianying Zhang

In this paper we investigate a free boundary problem for the diffusive Leslie-Gower prey-predator model with double free boundaries in one space dimension. This system models the expanding of an invasive or new predator species in which the free boundaries represent expanding fronts of the predator species. We first prove the existence, uniqueness and regularity of global solution. Then provide a spreading-vanishing dichotomy, namely the predator species either successfully spreads to infinity as $t\to∞$ at both fronts and survives in the new environment, or it spreads within a bounded area and dies out in the long run. The long time behavior of $(u, v)$ and criteria for spreading and vanishing are also obtained. Because the term $v/u$ (which appears in the second equation) may be unbounded when $u$ nears zero, it will bring some difficulties for our study.

keywords: Leslie-Gower model free boundary problem spreading-vanishing dichotomy long time behavior criteria for spreading and vanishing

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