The prohlc - m of persistence of the biological population is very important with regard to biomath - ematics and other related courses 对于生物数学和其它相关学科而言，种群的持续生存一直是学者们倍受关注的有趣问题。
How to try for papermaking industry " s development is an important problem that papermaking industry has to cope with 如何面对严峻的竞争环境，谋求造纸产业的持续生存与发展，已成为造纸产业当前需要迫切解决的重大课题。
Sufficient conditions for uniform persistence of this model are obtained via uniform persistence of infinite dimensional discrete dynamical systems 利用无穷离散动力系统的一致持续生存的理论给出了该系统一致持续生存的充分条件。
It ' s indicated that not only correct position - locating , but also exact relation - locating is the presupposition for existing and developing of a firm 研究表明，企业的持续生存和发展，仅仅依靠正确的位置定位是不够的，还需要有正确的关系定位及其应对策略。
How the enterprise can better survive and develop is the focus of the researches on corporate governance culture ( cgc ) and competitiveness , which are independent from each other till recently 摘要对公司治理文化和企业竞争力的研究都是关注企业如何才能更好地持续生存和发展的问题，但迄今为止，两者之间的研究是相对独立的。
Sufficient conditions for the global attractivity of boundary equilibrium are obtained via fluctuation lemma , and sufficient conditions for uniform persistence of this model are obtained via uniform persistence of infinite dimensional systems 然后利用无穷维动力系统一致持续生存的理论给出了该系统一致持续生存和绝灭的充分条件。
A1 , a2 denotes the rate of as hunting fot the populations x1 , x2 , f is the functional response ; . in [ 25 ] , a new prey - predator modle with stage - structured has been provided in which the predator might reduce the death rate by feeding on the preys 文[ 25 ]提出了一个新的阶段结构捕食被捕食模型，其中考虑捕食者的成年种群通过捕食减少了自身的死亡率，从而加大了种群持续生存的可能。
By using differential inequality , comparable theory and the lyapunov functional we obtain some sufficient conditions that guarantee the permanence of the species and some sufficient conditions that guarantee every positive solution global attractivity . and if the system is a 本文利用微分不等式，比较原理和lyepuno ~ ’ razumkin技巧，分别获得如上两个模型持续生存和一致持久的充分条件，以及模型任意正解全局渐近稳定的充分条件
In this paper , ( ) combined with the factor of ( ) is considered . it show the influence of the stage structure on the uniform persistence and the existence and uniqueness of the positive positive periodic and almost periodic solution and their corresponding stability 在本文中，在( * * * )的基础上结合( * )的因素，考虑阶段结构对种群持续生存方面以及在周期和概周期环境下，模型的周期和概周期解的存在唯一性及其相应稳定性方面的影响。
