Under some suitable conditions,it is proved that the ω-limit set of every bounded solution of such a equation is composed of r-periodic solutions.

The defining of thawing cycle of natural thawing method in the slicing of placer gold deposit in permafrost horizon;

Existence of periodic solutions to ecological model of microbes;

Exponential stability and existence of periodic solutions for a class of recurrent neural networks with delays;

On the existence theorem of periodic solution for differential inclusion;

Existence of periodic solutions for a class of non-autonomous second order Hamiltonian Systems;

Existence theorem of periodic solutions for a class of ordinary differential systems;

Existence of periodic solutions for p-Laplacian differential equation with Nagumo condition;

Uniqueness of almost periodic solution of an epidemic SIS model with variable coefficient;

Global asymptotic stability of almost periodic solutions for a predator-prey system;

Existence and uniqueness of almost periodic solutions to the retarded Liénard equation;

Permanence and positive periodic solution of a periodic predator-prey model;

Existence of positive periodic solutions for Holling Ⅱ type functional response systems with impulse;

A positive periodic solution to Rosenzweig-Macarthur model;