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具投放的中立型时滞竞争扩散系统正周期解的存在性

房辉; 王志成   

  1. (昆明理工大学理学院 昆明 650093)
  • 收稿日期:2006-03-15 修回日期:2008-01-09 出版日期:2008-08-25 发布日期:2008-08-25
  • 通讯作者: 房辉
  • 基金资助:
    国家自然科学基金(10161007; 10561004; 10271044)资助

Existence of Positive Periodic Solutions of a Neutral Delay Competition Model with Diffusion and Stock

Fang Hui; Wang Zhicheng
  

  1. (Faculty of Science, Kunming University of Science and Technology, Kunming 650093)
  • Received:2006-03-15 Revised:2008-01-09 Online:2008-08-25 Published:2008-08-25
  • Contact: Fang Hui

摘要:

利用Nussbaum 度理论建立了具投放的中立型时滞竞争扩散系统

x′1(t)=x1(t)[a1(t)-b1(t)x1(t)-c1(t)y(t) ]+D1(t)[x2(t)-x1(t)]+S1(t),
x′2(t)=x2(t)[a2(t)-b2(t)x2(t)]+D2(t)[x1(t)-x2(t) ]+S2(t),

y′(t)=y(t)[a3(t)-b3(t)y(t)-α(t)y(t-τ1(t))-β(t) ∫0τ k(s)y(t+s)ds
-γ(t)y’(t-τ2(t))-c3(t)x1(t)].

存在正周期解的一个充分条件.

关键词: Nussbaum 度, 正周期解, 中立型时滞竞争模型, 扩散, 投放

Abstract:

By means of Nussbaum degree theory, a sufficient condition is established for the existence of positive periodic solutions of a neutral delay competition model with diffusion and stock

x′1(t)=x1(t)[a1(t)-b1(t)x1(t)-c1(t)y(t) ]+D1(t)[x2(t)-x1(t)]+S1(t),
x′2(t)=x2(t)[a2(t)-b2(t)x2(t)]+D2(t)[x1(t)-x2(t) ]+S2(t),

y′(t)=y(t)[a3(t)-b3(t)y(t)-α(t)y(t-τ1(t))-β(t) ∫0τ k(s)y(t+s)ds
-γ(t)y’(t-τ2(t))-c3(t)x1(t)].

Key words: Nussbaum degree, Positive periodic solution, Neutral delay competition model, Diffusion, Stock

中图分类号: 

  • 34K13