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Since the production of carbon nanotubes synthesized by arc-discharge method contains impurities such as carbon nano-particles, amorphism carbon and graphite fragment, several purification methods were used to purify carbon nanotubes. It is found that with oxidation method in air, we can easily get purified carbon nanotubes.

由于用电弧放电法合成出来的纳米碳管产物中除了有纳米碳管外，还含有一些纳米石墨颗粒、无定形碳和石墨碎片等，因此本文对用电弧放电法合成出的纳米碳管进行了多种方法、探索性的提纯研究，实验结果发现，利用大气氧化法对纳米碳管进行提纯效果好，设备简单，是一种方便实用的方法。

Several control methods were discussed and amplitude and phase separate modulation was presented.

数字化是控制领域发展的趋势，在具体实现能量回馈系统的过程中，本文也充分运用数字式控制方式。

There are several constructors available, all of them taking a bounding rectangle and an array of values.

有几个可用的构造，所有的人采取的边界矩形和值的数组。

Although he left his native Tyrol after adopting Anabaptism, and while he was forced further to move several times because of his Anabaptist views, Marpeck's skills as a civil engineer enabled him to live in relative security.

虽然他离开本土后，蒂罗尔州通过Anabaptism ，虽然他被迫进一步推动几次，因为他再洗礼派的观点， Marpeck的技能作为一个土木工程师，使他生活在相对安全的。

Not every patient can cope with several surgical procedures under local anaesthesia over an extended period of time.

不是每个病人都能应付几个局部麻醉下手术程序，在一段较长时间。

It's a good idea to have a crap several hours before anal sex.

如果可以的话，尽量在1到2个小时前去排一排。

At first the paper has introduced the power amplifier, including its classification, its main technical specification, several kinds of common enlargement circuitry, and analyzed the switch power amplifier principle of work as well as its analysis situs expansion.

本篇论文首先对功率放大器进行了介绍，其中包括它的分类，它的主要技术指标，几种常见的放大电路原理，分析了开关功率放大器的工作原理以及其拓扑扩展。

In this paper, we treat the composition operators on several analytic function spaces. The study of analytic composition operators links analytic-function theory and operator theory.

本文主要从事解析函数空间上的复合算子的研究而未涉及可测函数空间上的复合算子。

We give several sufficient conditions of NA and NSD properties of random variables, compare the closeness of distribution functions of order statistics between NA and independent rv's, investigate properties of NSD defined by supermodular functions, study the dependence structure of stationary Markov process and order statistics and their spacings from two samples, establish stochastic comparisons of order statistics of heterogeneous rv's in the hazard rate and the reversed hazard rate orders, and give the first analytic proof of the closure property of the up shifted likelihood ratio order under convolution.

给出判定一组随机变量NA性质的几个充分条件，并给出NA和独立随机变量的次序统计量之间"贴近性"的比较，系统地研究基于特殊函数类所定义的NSD负相依概念，给出一些判别NSD性质的结构定理和一些有用概率不等式。系统研究平稳马氏过程的相依结构。研究两样本次序统计量及其问题隔的相依结构。在失效率、反向失效率序和似然序意义下给出非齐次随机变量次序统计量的比较。给出上漂移似然序卷积封闭性的第一个解析证明。

The research fields are calculus of single variables functions and several variables functions, space analytic geometry, series, differential equation.

通过本课程的学习，使学生掌握一元函数微积分、向量代数和空间解析几何、多元函数微积分、无究级数、常微分方程等方面的基本概念、基本理论和基本运算技能，为学习后继课程和进一步获得数学知识奠定必要的数学基础。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。