查询词典 attractivity

As to the even developing economy the big cities will lose attractivity gradually to the gradutes.

随着经济的平衡发展，大城市将逐渐会失去对毕业生的吸引。

Sufficient conditions are derived for the permanence and for the existence, uniqueness and global attractivity of periodic solution.

给出了当系统为周期系统时，其周期解存在惟一和全局吸引的条件

Furthermore,by means of constructing a Lyapunov functional,we attain to the sufficient conditions for the global attractivity of a positive periodic solution of this model.

在最后一章，利用重合度方法，我们考虑了一类具有功能反应的离散种群动力系统正周期解的存在性。

By Independent-subsystem method, the results of existence and global attractivity of a positive periodic solution are obtained.

本文运用重合度理论中的Mawhin延拓定理或系统的持久性结果得到了几类种群生态学模型正周期解的存在性条件；并通过构造Lyapunov泛函(或Razumikhin函数)研究了某些模型正周期解的全局吸引性。

We obtain the sufficient conditions for the global attractivity of the zero solution and the positive equilibrium N.

研究具有多个滞量的离散Nicholson苍蝇模型的全局吸引性，获得了零解全局一致渐近稳定及正平衡态N＊全局吸引的充分条件，推广了已有的相应结论。

In Chapter Ⅲ, the global stability and global attractivity of some planar autonomous systems are dealed with.

第二章考虑平面自治系统同宿轨族的一些定性性态，证明了系统至多存在一个最大椭圆扇形，得到此系统的轨线趋于奇点及同宿轨族、闭轨族、双曲扇形和椭圆扇形的存在性与不存在性的充分或充要条件。

Secondly, combining with our previous discussion on permanence and global attractivity, we weaken our sufficient conditions for permanence and extinction of the species further, and get better results by now.

利用函数的上、下平均值，我们得到系统持久和全局吸引的充分条件，从而，推广了Ahmad和Lazer的有关结果。

Satio and Takeuchi proposed this model and then they establishedsu?cient conditions for global attractivity of an interior equilibrium.

Satio和Takeuchi提出了该模型并且给出了保证全局吸引性的充分条件。

The sufficient conditions for persistence and global attractivity of peridic solutions are obtained by means of using differential inequality and constructing suitable Lyapunov function.

研究了一类扩散具有时滞的非自治捕食系统的持久生存与周期解问题，利用微分不等式和L iapunov泛函的方法得到了该系统持久生存与周期解全局吸引的充分条件。

With the help of the theory of difference equation and some subtle analysis, sufficient conditions which ensure the permanence of the system are obtained. By constructing a suitable Lyapunov functional, sufficient conditions which ensure the global attractivity of the system are obtained.

首先利用差分方程的有关理论以及技巧性的计算，得到保证该系统永久持续生存的充分性条件；其后通过构造适当的差分Lyapunov泛函，得到保证该系统全局吸引的充分性条件。

I had a lovely dog named PiPi, he was one of my best friends.

我曾经有过一只小狗，它的名字叫皮皮，它很善良，它是我最忠实的朋友。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。