In this paper, the existence of two positive periodic solutions for a generalized delayed population model with an explo......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

研究了如下一类具分布与离散时滞的一阶微分系统x＇（t）=gradG（x（t）＋∫^0-rf（t,s,x（t＋s））ds＋g（t,x（t-θ（t））的周期解的存在性，其中G∈C^2（R^n,R）,f∈C[R&#2......

We study a class of Dirichlet functions obtained as analytic continuation across the line of convergence of Dirichlet se......