摘要
建立了对数种群模型N'(t)=N(t){r(t)-a1(t)In[N(t)]-a2(t)In[N(t-r(t))]}的正周期解的存在性及吸引所有正解的充分条件,通过构造函数f(x)=x+e^a/x(0〈x≤1),研究了时滞种群模型的正周期解对所有正解的吸引性,改进了相关文献中的结论.
The sufficient conditions for the existence of a positive periodic solution and its global attractiveness for logarithmic population modelN'(t)=N(t){r(t)-a1(t)In[N(t)]-a2(t)In[N(t-r(t))]}are established,by constructuring function f(x)=x+e^a/x(0〈x≤1),we studied the attractiveness of a positive periodic solution of a delay population model for all positive solution, the results of the related literatures are improved.
出处
《北华大学学报(自然科学版)》
CAS
2008年第5期397-402,共6页
Journal of Beihua University(Natural Science)
基金
国家自然科学基金资助项目(10471153)
关键词
时滞种群模型
正周期解
全局吸引性
Delay population model
Positive periodic solution
Global attractiveness