一类Hassell-Varley型随机恒化器系统的定性分析
On Qualitative Analysis of a Stochastic Chemostat Model with Hassell-Varley Functional Response
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摘要: 考虑到稀释率受随机噪声的影响,研究了一类具有Hassell-Varley型功能反应函数的随机恒化器模型。运用随机微分方程比较原理证明了模型正解的全局存在唯一性。通过构造Lyapunov函数,利用It?公式得到了随机有界性和绝灭平衡点的全局随机渐近稳定性的充分条件,研究了随机系统围绕确定性系统正平衡点的振荡行为。
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关键词:
- Hassell-Varley型功能反应函数 /
- 恒化器 /
- It?公式 /
- 随机有界性 /
- 稳定性
Abstract: A stochastic Chemostat model with Hassell-Varley functional response has been considered ,in which the dilution rate was influenced by white noises .By comparison theorem of stochastic equations and It?formula ,it is shown that there is a unique positive solution to the system .Moreover ,the sufficient conditions for some population dynamical properties including the stochastic ultimate boundedness and the stochastically asymptotic stability of the washout equilibrium have been obtained .Furthermore ,it is also show n how the solution spirals around the positive equilibrium of deterministic system .
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