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Based on the fundamental theory of impulsive differential systems, employing Green formula, Gauss divergence theorem, Jensen inequality and Gronwall-Bellman inequality with impulse, we discuss the oscillation of impulsive partial differential systems by adopting reduction to absurdity and the stability in via of comparison theorem, respectively. Especially, we take an in-depth study on the oscillation of neutral impulsive parabolic systems and the stability of a class of nonlinear impulsive partial differential equations and obtain some useful conclusions.

本学位论文以脉冲微分系统基本理论为基础，利用反证法的分析方法和比较定理，结合Green公式、Gauss散度定理、Jensen不等式、含脉冲的Gronwall-Bellman不等式以及相关数学工具研究了脉冲偏微分系统的振动理论和稳定性理论，特别对中立型脉冲时滞抛物系统的振动性和一类非线性脉冲偏微分系统的稳定性作了较为深入的研究，给出了一些有用的结论。

Some sufficient criteria were obtained for oscillation of all solutions of such systems under first boundary value conditions by employing Gauss＇ divergence theorem, the integral inequalities and some results of the functional differential equations.

研究一类具非线性扩散系数的中立型双曲泛函偏微分方程组的振动性，利用Gauss散度定理、积分不等式和泛函微分方程的某些结果，获得了该类方程组在第一类边值条件下所有解振动的若干充分判据，结论充分表明振动是由时滞量引起的，同时也揭示该类方程组与普通双曲型偏微分方程组质的差异。

Moreover, by employing the product technique, based on the generalized Chirp-like sequence set, two new classes of approximately optimal polyphase sequences with zero correlation zone can be easily generated.

此外，利用序列乘积的技巧，基于广义Chirp-like序列族，本文得到了两类新型实现简单的渐进最佳多相零相关区扩频序列。

In this thesis, by employing generating function technique, some new combinatorial identities have been established.

本文利用发生函数理论建立了一系列新的组合恒等式，并且利用发生函数方法讨论了一些级数的取整值问题以及某些多项式在有理点的取值问题。

Based on the analysis of the basic resources, structures, exploiting conditions and present foundation, the paper has given a comprehensive evaluation on the tourist resources and furthermore made a quantitative evaluation on the exploiting potentialities by employing the gradationally analytical method.

本文首先对本区石质山地重点旅游资源进行概述，然后进行旅游资源分类和单体评价。在做出定性评价后，借助一定的技术手段，对本区石质山地旅游资源开发潜力进行定量评价。

First of all, based on the analysis of the basic tourist characteristics, types, structures, exploiting conditions and present foundation, Ive given a comprehensive evaluation on the tourist resources in Tianshui City, and furthermore made a quanitative evaluation on the exploiting potentialities by employing the gradationally analytical method. Thus a reasonable evaluation result has come to conclusion.

首先，通过基本特征，类型结构，开发条件和现有基础的分析，对天水旅游资源进行了综合评价，并应用层次分析法对开发潜力进一步作了定量评价，得出了较为合理的评价结果。

Employing the GREEN theorem, the boundary integral equations for solving the ground surface potential are derived for the first time, both for one object underground and for complicated geological structure.

利用格林公式首次推导出了单一目标体和复杂地质结构两种情况下直流电阻率正演模拟中求解表面电位的边界积分方程。

Second, employing the historical analysis and comparative methods, it successfully combined the academic research with real practices and gropingly offered systemic suggestions for political reform in China.

其次，从政治学理论与实践相结合的角度，运用历史分析和比较方法，探索性地提供了进一步健全和完善社会主义权力制约的改革思路，做到了描述、解释与设计、探索的有机结合。

Hadassah, or Esther, saves her people from destruction by their enemies by employing her daring courage.

哈达萨，像以斯帖一样，凭借自己的无畏精神拯救了她的人民，使其免遭敌人的毁灭。

He will not be able to take away the moral curse of using force by employing it halfheartedly or incompetently.

半心半意或表现无能并不能使他摆脱因使用武力而引起的道义上的谴责。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。