保护

On the basis of the analysis of the transient negative current, a compensated voltage can be generated with multiplying the rms value of the negative sequence transient current of the feeder by a settable compensated reactance, then combined with the magnitude of the zero-sequence voltage to consist of the compounded compensated voltage, which can be utilized to revise the characteristics of the inverse time-delay.

其基本保护采用零序过电压保护，动作时间采用反时限特性；在分析接地故障负序暂态电流分布特点的基础上，利用线路负序电流暂态有效值与一个可整定的补偿电抗相乘，形成补偿电压，并与零序电压幅值合成复合补偿电压，利用该电压对基本的反时限动作特性曲线进行修正，使零序过电压保护具有选择性。

The inverse time delay characteristic is adopted by the basic zero-sequence over-voltage protection. On the basis of the analysis of the transient negative current, a compensated voltage can be generated with multiplying the rms value of the negative sequence transient current of the feeder by a settable compensated reactance, then combined with the magnitude of the zero-sequence voltage to consist of the compounded compensated voltage, which can be utilized to revise the characteristics of the inverse time-delay.

其基本保护采用零序过电压保护，动作时间采用反时限特性；在分析接地故障负序暂态电流分布特点的基础上，利用线路负序电流暂态有效值与一个可整定的补偿电抗相乘，形成补偿电压，并与零序电压幅值合成复合补偿电压，利用该电压对基本的反时限动作特性曲线进行修正，使零序过电压保护具有选择性。

STUDY ON THE APPROACH AND THE MEDCHINE FOR THE DEPROTECTION OF SILYL ETHER BY SODIUM PERIODATE Abstract Silyl ethers are the most widely used hydroxyl protecting groups in organic synthesis.

第二部分：过碘酸钠去硅醚保护基方法及机理的研究硅醚保护基种类多，稳定性较好，且反应简单，作为羟基的保护基在有机合成中得到广泛应用。

The constructure is very easy.And it′s function is stable.The controller supervises the final parts by wired or wireless style.When the electric cable was stoled.

该保护仪结构简单，性能可靠，采用有线或无线报警方式。2 HE 1型电缆防盗保护仪的设计HE 1型电缆防盗保护仪原理框图如图1所示。

The flaw that exists in the tillable field protection policy laid down by the central government and deviation from the policy hypothetical goal in implementation by the local government lead to the breakdown of the tillable field protection policy. Finally, the author proposes some countermeasures about tillable field protection policy.

本文认为中央政府在耕地保护政策设计过程中存在的缺陷和地方政府在政策的执行过程中偏离了政策设定的目标是导致耕地保护政策不能完全发挥其作用的最重要的原因，最后就此提出了改变我国现行耕地保护政策的一些思路。

In this new strategy, selective glycosylation of indolecarbazole can be achieved using unprotected, unactivated glucose.

采用了新的糖苷化手段，可以使吲哚并咔唑直接与未保护和活化的葡萄糖作用选择性的生成β糖苷键，省略了糖的多步保护、脱保护过程，大大简化了操作。

Furthermore system also designed overvoltage protection, over-current protection, undervoltage protection lost pressure.

此外系统还设计了过压保护，过流保护，失压欠压保护。

A ground fault protection is introduced which is not only suitable for unground neutral network, but also suitable for earth neutral system (also called compensation network ) which grounding through arcextinguishing coil connected with a parallel resistance.

介绍一种既适合于中性点不接地电网，又适合于中性点经消弧线圈并电阻接地电网的接地选线保护，该选线保护装置解决了现有接地选线保护不能适应中性点经消弧线圈并电阻接地电网的问题

For example, consumers themselves should have a certain sense of vigilance, that is to say, choosing those famous websites during shopping, reading shopping articles carefully before shopping, properly reserving the shopping voucher and so on; the business companies should strive to elevate their credibility index, based on the principle of being responsible for customers; the government may establish the Net 315 Protection Center for Consumer Rights and Interests to unifiedly supervise and manage online shopping, using the experience of traditional consuming market on protection of consumers' rights and interests; the whole international society should fully cooperate to provide more international supports for domestic protection of consumers' rights and interests by such means as instituting various bilateral or multilateral agreements, international conventions in time and etc.

比如消费者自身要有一定的警惕意识，购物时应选择那些知名网站，购物前应该仔细阅读购物条款，对购物凭证应妥善保留等等；商家应本着对消费者负责的原则，努力提高自己的诚信指数；政府则可以借鉴传统消费市场对消费者权益的保护经验，设立&网络315消费者权益保护中心&，对网上购物实行统一监管；整个国际社会应该通力合作，及时制定各种双多边协议、国际公约等手段，为国内消费者权利的保护提供更多的国际支持。

ABSTRACT Power electronics devices are developed rapidly. There are some factors which influence the protective properties of the devices, including such as electrical characteristics of protection materials, the interface conditions of protective materials-pn junction, the surface effective charge density, the polarizable or unpolarizable properties of organic protective materials, etc.

电力半导体器件是近期发展起来的一类功率电子器件，其表面保护与其它电气元件不同，一方面要考虑器件表面绝缘保护材料的电性能和含杂等因素；另一方面，器件的表面钝化保护材料与器件接触后，器件的界面情况、材料与器件接触带电情况、以及材料所含官能团的极性等情况，也是影响器件性能的主要因素。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。