The conditions with periodic solution are discussed in detail relating to fractional linear recursive relation of first order and some useful conclusions are obtained.

对一阶分式线性递归关系具有周期解的条件进行了详细讨论，得到若干有用的结论；

Then the thesis investigates crossover interval and crossover method of PSA/GC, and obtains useful conclusions.

通过对PSA/GC的交叉间隔和交叉手法进行了探讨，得到了有益的结论。

This paper presents some useful conclusions though comparison among models based on different boundaries and constitutive model.

对于不同的边界条件和本构模型，通过计算结果对比分析，得出一些有实用的结论。

After being exerted different polar and strength applied voltages to friction pair, their effects on tribology performance were observed and some useful conclusions were drawn.

在摩擦副两端施加外加电动势后，测量观察了不同极性、不同强度的外加电动势对摩擦学特性的影响，得出了一些有益的结论。