* Correspondence: Email: lxd@ sdnu. edu. cn; Tel:+ 86-0531-86181779; Fax:+ 86-0531-
86181779. Abstract: In this paper, a class of survival red blood cells model with time-varying …

The goal of this paper is to understand the interplay between seasonality and diapause on
the population dynamics of ticks. To analyse this challenge, we study a mathematical model …

In this paper, we obtain sufficient conditions for the persistence and permanence of a family
of nonautonomous systems of delay differential equations. This family includes structured …

In this paper, we derive criteria of global attractivity of a (possibly constant) positive periodic
solution in non-autonomous systems of delay differential equations. Our approach can be …

We consider a Nicholson's equation with multiple pairs of time-varying delays and nonlinear
terms given by mixed monotone functions. Sufficient conditions for the permanence, local …

In this paper we study the scalar delay differential equation x′(t)= α (t) x (tg 1 (t)) f (a (t), x (tg
2 (t)))-β (t) x (t) where f is decreasing in both arguments and the coefficients are positive and …

We give a brief overview of some recent results for nonautonomous Nicholson's equation
with multiple pairs of time-varying delays and nonlinear terms given by mixed monotone …

A general nonautonomous Nicholson equation with multiple pairs of delays in mixed
monotone nonlinear terms is studied. Sufficient conditions for permanence are given, with …

This study is devoted to considering dynamic properties of an environmental protection
expenditures model for protected areas (PAs) with two delays. It presents an improved …

This paper investigates an environmental protection expenses model, which considers the
relations between the visitors to the protected areas V, the quality of the environmental …