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讨论了一类具有时滞的单种群扩散模型,其中扩散依赖于时滞,利用同伦技术得到了模型存在正平衡点和系统一致持续生存的充分条件;同时通过构造适当的liapunov函数证明了系统正平衡点是全局渐渐稳定的. 相似文献
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构造并研究了一类具有非局部时滞Schoner竞争反应扩散模型.每一个种群的成熟期是一个常数,而且只有成年种群存在竞争,幼年的种群并不存在竞争,此外种群个体在空间区域中的运动是随机行走的.我们利用Wang,Li和Ruan建立的具有非局部时滞的反应扩散系统的波前解存在性理论,证明了连接两个边界平衡解的行波解的存在性. 相似文献
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一类具有扩散的三种群生态模型正解的存在性 总被引:5,自引:0,他引:5
应用Dancer不动点指数理论,通过对一类具有扩散的三种群生态模型的研究,给出了讨论具有扩散的三种群相互作用模型正解存在性问题的一般方法. 相似文献
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对具有扩散项的时滞Nicholson方程的行波解进行了研究.特别是考虑到生物个体在空间位置上的迁移,研究了具有非局部反应的时滞扩散模型.对于弱生成时滞核,运用几何奇异摄动理论,在时滞充分小的情况下,证明了行波解的存在性. 相似文献
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本文利用上、下解技巧和单调迭代法,研究了具Allee反应的时滞扩散单种群增长模型的波前解,给出了波前解存在的条件. 相似文献
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本文利用上、下解技巧和单调迭代法,研究了具Allee反应的时滞扩散单种群增长模型的波前解, 给出了波前解存在的条件. 相似文献
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该文研究了一类具有时滞的单种群扩散模型, 利用同伦技术得到了模型存在正平衡点. 在适当的条件下证明了系统是一致持续的, 获得了系统的正平衡点的局部和全局稳定性的充分条件. 相似文献
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本文中,我们考虑一类带有扩散和时滞的捕食系统,利用微分不等式理论及比较定理,得到了系统的种群一致持久性和全局渐近稳定性的判别准则. 相似文献
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Stability and Hopf bifurcation of a delayed predator-prey system with nonlocal competition and herd behaviour 下载免费PDF全文
In this paper, we investigate the stability and Hopf bifurcation of a diffusive predator-prey system with herd behaviour. The model is described by introducing both time delay and nonlocal prey intraspecific competition. Compared to the model without time delay, or without nonlocal competition, thanks to the together action of time delay and nonlocal competition, we prove that the first critical value of Hopf bifurcation may be homogenous or non-homogeneous. We also show that a double-Hopf bifurcation occurs at the intersection point of the homogenous and non-homogeneous Hopf bifurcation curves. Furthermore, by the computation of normal forms for the system near equilibria, we investigate the stability and direction of Hopf bifurcation. Numerical simulations also show that the spatially homogeneous and non-homogeneous periodic patters. 相似文献
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Stability and Hopf bifurcation analysis in a novel congestion control model with communication delay
Songtao Guo Xiaofeng Liao Chuandong Li 《Nonlinear Analysis: Real World Applications》2008,9(4):1292-1309
In this paper, we investigated Hopf bifurcation by analyzing the distributed ranges of eigenvalues of characteristic linearized equation. Using communication delay as the bifurcation parameter, linear stability criteria dependent on communication delay have also been derived, and, furthermore, the direction of Hopf bifurcation as well as stability of periodic solution for the exponential RED algorithm with communication delay is studied. We find that the Hopf bifurcation occurs when the communication delay passes a sequence of critical values. The stability and direction of the Hopf bifurcation are determined by applying the normal form theory and the center manifold theorem. Finally, a numerical simulation is presented to verify the theoretical results. 相似文献
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Stability and Hopf bifurcation of a modified delay predator-prey model with stage structure 下载免费PDF全文
Jing Li Shaotao Zhu Ruilan Tian Wei Zhang Xin Li 《Journal of Applied Analysis & Computation》2018,8(2):573-597
In this paper, a modified delay predator-prey model with stage structure is established, which involves the economic factor and internal competition of all the prey and predator populations. By the methods of normal form and characteristic equation, we obtain the stability of the positive equilibrium point and the sufficient condition of the existence of Hopf bifurcation. We analyze the influence of the time delay on the equation and show the occurrence of Hopf bifurcation periodic solution. The simulation gives a visual understanding for the existence and direction of Hopf bifurcation of the model. 相似文献
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一类具时滞的生理模型的Hopf分支 总被引:5,自引:0,他引:5
本文研究了一类简化的具时滞的生理模型的稳定性和Hopf分支.首先,以滞量为参数,应用Cooke的方法,把R^+分为两个区间,使当滞量属于相应区间时,所考虑的模型的平凡解是稳定或不稳定的,同时得到了Hopf分支值.然后,应用中心流形和规范型理论,得到了关于确定Hopf分支方向和分支周期解的稳定性的计算公式.最后,应用Mathematica软件进行了数值模拟。 相似文献
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Delay induced subcritical Hopf bifurcation in a diffusive predator-prey model with herd behavior and hyperbolic mortality 下载免费PDF全文
Xiaosong Tang Heping Jiang Zhiyun Deng Tao Yu 《Journal of Applied Analysis & Computation》2017,7(4):1385-1401
In this paper, we consider the dynamics of a delayed diffusive predator-prey model with herd behavior and hyperbolic mortality under Neumann boundary conditions. Firstly, by analyzing the characteristic equations in detail and taking the delay as a bifurcation parameter, the stability
of the positive equilibria and the existence of Hopf bifurcations induced by delay are investigated. Then, applying the normal form theory and the center manifold argument for partial functional differential equations, the formula determining the properties of the Hopf bifurcation are obtained. Finally, some numerical simulations are also carried out and we obtain the unstable spatial periodic solutions, which are induced by the subcritical Hopf bifurcation. 相似文献
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Yongfeng Ma 《Nonlinear Analysis: Real World Applications》2012,13(1):370-375
In this paper, the Leslie-Gower predator-prey system with two delays is investigated. By choosing the delay as a bifurcation parameter, we show that Hopf bifurcations can occur as the delay crosses some critical values. In addition, special attention is paid to the global continuation of local Hopf bifurcations. Using a global Hopf bifurcation theorem for functional differential equations, we show the global existence of periodic solutions. 相似文献
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Salih Djilali 《Journal of Applied Analysis & Computation》2019,9(2):638-654
In this paper, we deal with the effect of the shape of herd behavior on the interaction between predator and prey. The model analysis was studied in three parts. The first, The
analysis of the system in the absence of spatial diffusion and the time delay, where the local stability of the equilibrium states, the existence of Hopf bifurcation have been investigated. For the second part, the spatiotemporal dynamics introduce by self diffusion was determined, where the existence of Hopf bifurcation, Turing driven instability, Turing-Hopf bifurcation point have been proved. Further, the order of Hopf bifurcation points and regions of the stability of the non trivial equilibrium state was given. In the last part of the paper, we studied the delay effect on the stability of the non trivial equilibrium, where we proved that the delay can lead to the instability of interior equilibrium state, and also the existence of Hopf bifurcation. A numerical simulation was carried out to insure the theoretical results. 相似文献
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Chunrui Zhang Mingzhu Liu Baodong Zheng 《Journal of Applied Mathematics and Computing》2004,14(1-2):319-328
In this paper we investigate the qualitative behaviour of numerical approximation to a class delay differential equation. We consider the numerical solution of the delay differential equations undergoing a Hopf bifurcation. We prove the numerical approximation of delay differential equation had a Hopf bifurcation point if the true solution does. 相似文献