%0 Journal Article
%T 一类具季节性时变参数和周期时滞的浮游植物-浮游动物模型的正周期解<br>The Existence of Positive Periodic Solutions for a Phytoplankton-Zooplankton Model with Seasonally Varying Parameters and Time Delays
%A 刘华祥
%A 曾广洪
%J -
%D 2012
%X 提出了一类具季节性时变参数和周期时滞的有3种浮游生物种群组成的动力学模型,包括无毒浮游植物(NTP)、有毒浮游植物(TPP)和浮游动物(Z),并研究了该系统的正周期解的存在性.通过运用叠合度理论中的延拓定理,建立了保证该系统至少存在1个正周期解的充分条件,所得结果适用于相应的无时滞和离散时滞系统.<br>A three-dimensional ratio-dependent phytoplankton- zooplankton model with time delay and seasonal effects consisting of non-toxic phytoplankton(NTP), toxin producing phytoplankton (TPP) and zooplankton (Z) is considered. The existence of positive periodic solutions for the systems is studied. By using the continuation theorem of coincidence degree theory, a set of sufficient conditions are obtained for the existence of at least one strictly positive periodic solution. The results are established for the underlying systems without time delay or with discrete time delay
%K 浮游植物-浮游动物
%K 时滞
%K 正周期解
%K 叠合度的延拓定理
%K 拓扑度<br>浮游植物-浮游动物 时滞 正周期解 叠合度的延拓定理 拓扑度
%K 浮游植物-浮游动物 时滞 正周期解 叠合度的延拓定理 拓扑度
%K 浮游植物-浮游动物 时滞 正周期解 叠合度的延拓定理 拓扑度
%K 浮游植物-浮游动物 时滞 正周期解 叠合度的延拓定理 拓扑度
%K 浮游植物-浮游动物 时滞 正周期解 叠合度的延拓定理 拓扑度
%U http://lkxb.jxnu.edu.cn//oa/darticle.aspx?type=view&id=20120515