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具有非线性扩散的捕食-食饵模型的整体分歧

The Global Bifurcation for a Predator-Prey Model with Nonlinear Diffusion
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摘要 在Dirichlet边界条件下研究一类具有非线性扩散的捕食-食饵模型正解的存在性。首先利用极大值原理及上下解方法给出正解的先验估计。其次考察相关特征值问题,给出无界的分歧曲线,并以食饵生长率为分歧参数,证明了中性曲线附近存在发自半平凡解的局部分歧正解。最后将局部分歧延拓为整体分歧,从而得到正解存在的充分条件。 A nonlinear diffusive predator-prey model is studied under Dirichlet boundary conditions. Some a priori estimates are firstly derived. Then by investigating the corresponding eigenvalue problem and taking the growth rate of prey as a parameter, local bifurcation positive solutions emanating from the semi-trivial solutions are obtained. Finally, by use of global bifurcation theory, two sufficient conditions for the existence of positive solutions are established.
出处 《中山大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第2期49-53,共5页 Acta Scientiarum Naturalium Universitatis Sunyatseni
基金 国家自然科学基金资助项目(10971124,11001160) 陕西省自然科学基础研究计划资助项目(2011JQ1015) 陕西科技大学博士科研启动基金资助项目(BJ10-17)
关键词 捕食-食饵 非线性扩散 分歧 predator-prey nonlinear diffusion bifurcation
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参考文献9

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