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1.
研究了一类具有无穷时滞竞争扩散模型的周期解问题,采用了上下解的方法,获得了周期解的存在唯一性,并给出了解的渐近性态.  相似文献   

2.
利用重合度理论中的延拓定理,研究了时间尺度上具有变时滞的两个捕食者和一个食饵的共存现象,证明了该捕食与被捕食系统至少一个正周期解.  相似文献   

3.
本文利用上下解和交叉迭代方法研究一类具有时滞的时间离散反应扩散系统行波解的存在性.所得结果能很好地应用到时间离散的竞争系统{u_n(x)-u_(n-1)(x)=d_1?~2/?x~2u_n(x)+r_1u_n(x)[1-a_1u_n(x)-b_1u_(n-t1)(x)-c_1u_(n-t2)(x)],u_n(x)-u_(n-1)(x)=d_2?~2/?x~2u_n(x)+r_2u_n(x)[1-a_2u_n(x)-b_2u_(n-t3)(x)-c_2u_(n-t4)(x)]中,而研究其行波解存在性转化为寻找一对合适的上下解.这些结果推广了已有的一些结果.  相似文献   

4.
主要讨论了具有限时滞的非自治三种群扩散捕食系统的周期解的存在性.方法是运用Yoshizawa型周期解定理的推广,得出该系统至少有一个ω周期解.  相似文献   

5.
文应用上下解的方法以及单调迭代序列的积分表达式,证明了在半空间R~n中耦合的时滞反应扩散方程组全局解的存在唯一性,并且用它解决了一类特殊的、Volterra-Lotka模型的解的存在性问题.  相似文献   

6.
研究了一类具有空间扩散和年龄结构的三种群捕食与被捕食系统的最优收获问题,运用Banach不动点原理讨论了系统解的存在唯一性,证明了最优收获控制的存在性,给出了最大值原理.结果可为多种群扩散系统最优控制问题的实际研究提供理论基础.  相似文献   

7.
张弘  严建明  罗桂烈 《数学研究》2004,37(4):338-346
研究一类具有时滞和基于比率的三种群捕食-食铒二斑块系统,利用重合度理论的连续定理建立了这类系统的周期解的存在性判据.  相似文献   

8.
具时滞的非自治的两种群捕食者-食饵缀块系统的持久性   总被引:4,自引:0,他引:4  
研究了具时滞的非自治的两种群捕食者-食饵缀块系统的持久性,建立了新的判据。  相似文献   

9.
李燕  刘伟安  黄启华 《数学杂志》2007,27(3):301-306
本文研究了一类具有无穷时滞竞争扩散模型的周期解问题,采用了上下解的方法,获得了周期解的存在性,并给出了解的渐近性态.  相似文献   

10.
研究了具时滞半比例依赖的捕食被捕食非单调函数反应系统的持久性,得到了比较弱的由积分形式表述的充分条件.  相似文献   

11.
莫嘉琪 《应用数学》1997,10(4):111-113
本文研究了一类非局部反应扩散问题.利用上、下解,讨论了相应问题解的存在唯一性及其渐近性态.  相似文献   

12.
具竞争项的反应扩散系统解的长时间性态   总被引:2,自引:0,他引:2  
陈松林 《应用数学》2000,13(2):101-104
本文研究一类具竞争项的Belousov-Zhabotinskii型化学反应扩散系统的初边值问题,应用上、下解理论,讨论两反应物共存或最终被 耗尽的参数环境。文末应用所得结果,给出了Neumann边值问题解的共存条件。  相似文献   

13.
    
The aim of this paper is to investigate the asymptotic behavior of solutions for a class of three-species predator-prey reaction-diffusion systems with time delays under homogeneous Neumann boundary condition. Some simple and easily verifiable conditions are given to the rate constants of the reaction functions to ensure the convergence of the time-dependent solution to a constant steady-state solution. The conditions for the convergence are independent of diffusion coefficients and time delays, and the conclusions are directly applicable to the corresponding parabolic-ordinary differential system and to the corresponding system without time delays.  相似文献   

14.
    
This paper presents a new nonlinear reaction–diffusion–convection system coupled with a system of ordinary differential equations that models a combustion front in a multilayer porous medium. The model includes heat transfer between the layers and heat loss to the external environment. A few assumptions are made to simplify the model, such as incompressibility; then, the unknowns are determined to be the temperature and fuel concentration in each layer. When the fuel concentration in each layer is a known function, we prove the existence and uniqueness of a classical solution for the initial and boundary value problem for the corresponding system. The proof uses a new approach for combustion problems in porous media. We construct monotone iterations of upper and lower solutions and prove that these iterations converge to a unique solution for the problem, first locally and then, in time, globally.  相似文献   

15.
带时滞的具有阶段结构的捕食抛物型方程组   总被引:15,自引:0,他引:15  
许飞  侯燕  林支桂 《数学学报》2005,48(6):1121-1130
本文对两种群的捕食与被捕食模型,运用了上下解方法及相应的单调迭代序列研究具有时滞的耦合半线性抛物方程组的动力学行为,给出了解的渐近性质及阶段结构对解的性质的影响。  相似文献   

16.
We investigate reaction–diffusion equation with spatio-temporal delays, the global existence, uniqueness and asymptotic behavior of solutions for which in relation to constant steady-state solution, included in the region of attraction of a stable steady solution. It is shown that if the delay reaction function satisfies some conditions and the system possesses a pair of upper and lower solutions then there exists a unique global solution. In terms of the maximal and minimal constant solutions of the corresponding steady-state problem, we get the asymptotic stability of reaction–diffusion equation with spatio-temporal delay. Applying this theory to Lotka–Volterra model with spatio-temporal delay, we get the global solution asymptotically tend to the steady-state problem’s steady-state solution.  相似文献   

17.
该文研究一带时滞的退化非线性抛物方程的初边值问题。运用正则化方法和上下解技巧证明了上述问题的古典正解的局部存在性及其可延拓性。讨论了整体存在性和 有限时刻熄灭,建立了临界长度,得到了熄灭点的位置以及特殊f(u)情形下的熄灭速率估计。  相似文献   

18.
In this paper,an initial boundary value problem with homogeneous Neumann boundary condition is studied for a reaction-diffusion system which models the spread of infectious diseases within two population groups by means of self and criss-cross infection mechanism. Existence,uniqueness and boundedness of the nonnegative global solution (u1,u2,u3,u4),existence of the limit of the solution as t→+∞,namely,(u1,u2,u3,u4)→(u*1,0,u*3,0),are proved.  相似文献   

19.
This paper deals with the existence of traveling wave solutions in delayed nonlocal diffusion systems with mixed monotonicity. Based on two different mixed-quasimonotonicity reaction terms, we propose new definitions of upper and lower solutions. By using Schauder's fixed point theorem and a new cross-iteration scheme, we reduce the existence of traveling wave solutions to the existence of a pair of upper and lower solutions. The general results obtained have been applied to type-K monotone and type-K competitive nonlocal diffusive Lotka-Volterra systems.  相似文献   

20.
Abstract. In this paper, an initial boundary value problem with homogeneous Neumann bound-ary condition is studied for a reaction diffusion system which models the spread of infectious dis-eases within two population groups by means of serf and criss-cross infection mechanism, Exis-tence, uniqueness and houndedness of the nonnegative global solution  相似文献   

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