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A periodic oscillation analytic solution for the system at bifurcation point was obtained by using the method of series.

利用级数法求出了系统在分歧点处的时间周期振荡解的解析表达式。

By bifurcation theory, we get the existence and local stabilities of the positive periodic solution.

利用分支理论得到了地方病周期解的存在性及局部稳定性。

Secondly,a bisection method is put forward for one sort of periodic structures.

对于两类周期结构采用部分组集，大大减少了有限元建模所需时间。

And establish a theory base for periodic blowdown to attain optimum effect.

为定期排污达到最佳效果奠定了理论基础。

In a periodic structure, the transport property can be well described by the Boltzmann's transport equation.

电子在周期性晶格中的传输行为，可由古典的波兹曼理论描述。

Based on the asymptotic homogenization,the periodic boundary conditions for the unit cell are established by using the ANSYS Parametric Design Language,the problem of the unit cell is solved by finite element method and the effective elasto-plastic properties of the composite is obtained,which is compared with other results.

在渐近均匀化方法的基础上，用ANSYS参数设计语言建立周期性边界条件，用ANSYS有限元程序对单胞进行求解，得到材料的有效弹塑性性能。

Based on the asymptotic homogenization , the periodic boundary conditions for the unit cell of composites are established using the ANSYS parametric design.

在渐近均匀化方法的基础上，用ANSYS参数设计语言建立了周期性边界条件，用ANSYS有限元程序对单胞进行求解，得到了复合材料的有效性能。

According to periodic boundary conditions, one unit cell has been isolated as the calculation region, and the method of lines is used to get the propagation equation of potential function in different interfaces of medium layers.

王瑞 西北大学信息科学与技术学院，西安 710127郑秋容空军工程大学电讯工程学院，西安 710077运用直线法对含有不同参数支撑介质的平面型电磁带隙结构进行了分析。

Based on the asymptotic homogenization theory, the periodic boundary conditions for the unit cell were established by using the ANSYS parametric design language. The problem of the unit cell was solved by finite element method and the effective elasto-plastic properties of dual phase steels were obtained.

在渐近均匀化方法基础上，假设双相钢的结构为周期排列，通过ANSYS参数设计语言建立周期性边界条件，用ANSYS有限元程序对3种平面应变模型的单胞进行求解，得到双相钢的有效弹塑性性能，并与其他计算结果进行比较。

Generalized Darcy's law was first derived from the study of fluid flow through a solid-fluid mixture,and the saturated permeability tensor of a preform could be predicted by studying its unit cell under periodic boundary conditions.

首先，采用均匀化理论分析了流体在多孔介质内的流动问题，推导出广义达西定律，证明以施加周期性边界条件的单胞为研究对象，可以预测预成型体的渗透率张量，并以单向纤维织物为例，对该方法进行了验证。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。