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In Chapter 4,we consider the existence of positive periodic solutions for impulsive differential equations with a parameter.

第四章讨论了一类含有参数的脉冲微分方程正周期解的存在性。

Periodic length and interface roughness of Mo/Si multilayers were determined by small angle X-ray diffraction.

Mo/Si多层膜的周期厚度和界面粗糙度由小角X射线衍射曲线拟和得到。

The numerical computation has been carried out for the diffraction efficiencyof phase-matching periodic grating.

然后，对位相匹配的周期性光栅的衍射效率进行了数值计算。

The periodic thickness and structure of the multilayer are measured by X-ray diffractometer.

利用X射线衍射仪测量了多层膜结构，在德国Bessy Ⅱ同步辐射上测量了在工作波长处多层膜反射率，测量的峰值反射率达7.5％。

In the second part, a method studying stochastic transition which is the master equation method is introduced, and explicit solutions of velocity V and diffusion constant D of the steady state are obtained when a particle hops among a dimensional and periodic N states.

第二部分介绍了一种研究随机跃迁的方法—主方程方法，着重推导了粒子做一维周期性N态随机跃迁时达到稳态的速度、扩散系数的一般表达式。

In chapter 4, we investigated the existence and asymptotic behaviors of periodic solutions and steady solutions of a type of reaction diffusion equation under different conditions respectively.

在第四章中，我们分别讨论了一类时滞反应扩散方程在有时滞和无时滞的情况下其平衡态解与周期解的存在性，并得到了解的渐近行为的一些结论。

Such phenomena are analytically verified when the coupling matrix is diffusively coupled with periodic and Neumann boundary conditions.

当耦合矩阵是扩散耦合且具有周期与诺曼的边界条件时，这种现象将被分析地证实。

In Chapter two, we discuss structure preserving discretization method for the one dimensional nonlinear Schr〓dinger equation with periodic boundary value condition by means of spectral method.

在第二章中，主要结果是讨论了一维非线性薛定谔方程的保结构离散化方法，采用谱方法给出了此方程的全离散计算格式。

The solution of some practical problems in engineering can be regarded as that of periodic solution of nonlinear autonomous systems according to the opinion of mathematics, The problems of this kind are analysed by means of the direct numerical method in this paper,The simple and convenient Draw Newton Method is applied for solving the parameter vectors in iteration course along with the calculation of a practical engineering problem.

日I崖旨J，'口工程中的一些实际问题往往可以归结为非线性自治系统，例如描述同步发电机暂态稳定性问题的转子摇摆方程，即是一典型的非线性自治系统。虽然可以用各种小参数摄动法求解非线性系统，但是这类方法是依据对线性系统的解进行"摄动"来逼近非线性系统解的。因而当系统

The information Radon coefficient wrap-around of the line on a finite field was caused by the modular arithmetic so that the Radon coefficient information in the periodic oscillations direction was processed with discrete cosine transformation, and other direction information was processed with wavelet analysis in order to reduce the wrap-around of rebuilding information. At the same time, according to the characteristic of the noise, one kind of denoising threshold selection plan was proposed.

正交有限脊波分析处理信息时，有限域平面上的直线由于模运算的存在而引起信息Radon系数的卷绕，为此，对Radon系数周期振荡方向的信息采用离散余弦变换处理，其他方向信息采用小波分析处理，以减少卷绕对信息重建影响；同时，结合图像信息中噪声的特点，提出了一种去噪浮动阈值的选取方案。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。