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In this thesis, we mainly study problems on global geometry and geometricanalysis of Riemannian submanifolds, including vanishing theorem for homologygroups, topological sphere theorem, L~2 harmonic 1-forms, finiteness of end andthe spectrum of the Laplacian. In 1973, by using the Federer-Fleming existence theorem and the techniquesfrom the calculus of variations in the geometric measure theory, H.

本文着重研究黎曼子流形上整体几何与几何分析的若干问题，主要内容包括子流形的同调群消没定理、拓扑球面定理、L~2调和1-形式、端的有限性和Laplace算子谱等问题。

The topological structure of a new type of static synchronous compensator, which consists of traditional 12-pulse converter and a cascaded H-bridge, is presented. The purpose of designing such a topological structure, which integrates the concepts of multi-level, soft-switching and re-injection, is to reduce the voltage harmonic content at AC side and to solve dynamic voltage balance among the switches connected in series.

介绍一种新型H桥级联静止同步补偿器(static synchronous compensator，STATCOM)的拓扑结构，它由传统的12脉冲变换器和一个H桥链构成，结合了多电平、软开关和注入技术，降低了交流侧电压谐波含量，解决了串联开关动态电压平衡的问题。

This paper studies and establishes torus harmonic analysis method of recovering the Earth's gravity field with all kinds of gravity observation data.

详细研究并建立了基于球面边值问题的轮胎调和分析方法。

In order to solve the current differential protection's maloperation, the combined harmonic blocking criteria and the criteria based on the trace of action point are proposed.

电流互感器发生暂态饱和时，二次电流中的谐波主要是2次谐波，3次谐波含量很少。

The ratio of the transmission signal and second - harmonic signal can be used for eliminating optical interference.

利用二次谐波与光纤光栅透射光强的比值来消除光路干扰。

The relation of trapezoidal wave slope angle to amplitude of output fundamental component and harmonic content is deduced.

推导了梯形波边坡角与输出基波幅值和谐波含量的关系。

I don't really mess with it because it sits on top of my amp, and I just plug in the adapter and play, but when I did I found that the octo setting is very, very cool you can use it for some wierd trippy color to add to your solo or anything, it gives it this harmonic meets an organ with sustain effect, but like I said this is basically my reverb tank, so I don't really use it for the other effects.

我真的不一塌糊涂，与它，因为它坐在再加上我的安培，而我只需将其插入，在适配器和发挥，但是当我，我发现该octo设置是非常，非常冷静，你可以用它来一些奇怪的trippy颜色添加到您的独奏或什么，它赋予它这种谐波会见器官与维持效果，但就像我说，这基本上是我的混响坦克，所以我真的不使用它为其他的效果。

The truncation error in calculating the harmonic loss is analysed and a method is offered to determine how many times harmonics must...

文中还对谐波损耗计算的截断误差进行了理论分析，确定了谐波损耗所需计算的最少谐波次数。

Methods 41 cases with tonsillectomy were treated with nasal endoscope applying ultracision-harmonic scalpel and routine operation respectively.The operating time and blood loss duing operation and the degree of pain and the region of inflammation tumidity as well as hospitalization days were observed.

鼻内镜直视下放大，对41例扁桃体切除术患者分别采用超声刀及常规手术方法，观察术中出血量、疼痛程度、炎性水肿范围、手术时间及住院天数。

For example, an extended low end of a tweeter will have it's harmonic distortion reduced in the area where the crossover begins to take effect.

例如，延长1高音低端将它的谐波失真，在面积减少交叉地方开始生效。

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。