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In this paper a new contingency screening and ranking method is formed by combiningiterative filtering screening technology with continuation power flow analysis. Researchingpreventive control policy in reactive power compensation and load control when themargin of stability is serious, and reciprocal math model is given;through the exempleof IEEE39 typical system , the availability of the discussed methods in this dissertationwas approved. Aimed at the real grid, the contingency screening analysis and preventivecontrol policy based on Beijing power grid is discussed;the static voltage stabilityanalysis software based on figure draw of Beijing grid is realized, and the software hasthe junction to BPA .

论文提出了将迭代过滤筛选技术和连续潮流法相结合的事故筛选分析方法；从无功补偿控制和负荷控制两方面研究了系统裕度紧张时的预防控制策略，给出了相应的数学模型；采用IEEE39节点的标准系统算例，验证了本文提出的静态电压稳定事故筛选分析方法的可行性；针对实际电网讨论了基于北京电网的事故筛选分析和预防控制策略；通过与BPA接口实现了基于北京电网图形平台的静态电压稳定分析软件。

Firstly, load and demands analysis is completed, taking a copper foil factory as an example.

文章首先以某铜箔厂为对象，对企业负荷和电能质量补偿要求进行了分析。

Where a conductor supplies a receptacle or cord connector that is marked as specified in 59.2 or 59.3 with an intended maximum available current, the load current value is to be the maximum current appearing in any of the markings provided.

应用在插座或接线端子上的导线要标识使用最大负载电流值，在59.2或59.3有规定最大有效电流。

3 The load for the last receptacle or cord connector of a set of receptacles or cord connectors on a circuit is to be 100 percent of the intended maximum available current for the set as specified in the marking in 59.3 when: a The marking in 59.3 is provided and b Each receptacle or cord connector or the set of receptacles and cord connectors is not provided with one of the markings specified in 59.2 or 59.3 to identify the intended maximum available current for each receptacle or cord connector.

30.2.3 电路中的一组插座或导线连接器的终端插座或导线连接器的负荷是所设组的最大电流的100%，见59.3标记，若有以下情况时： a有59.3中的标记 b 单个插座或导线连接器或一组插座和导线连接器在59.2 or 59.3没有指出单个插座或导线连接器所设的最大的可用电流。

Higher Viral load was corelated with lower CD+4%and CD+4/CD+8 ratio.And the CD+4%in Symptomatic cases was around 14%.

病毒载量较高的感染者相应的CD+4淋巴细胞百分率较低，有临床症状的感染者其CD+4百分率多在14%左右。

But the steel box girder is typical space thin-walled bars, because of bending-torsion coupling and steel curved box bridge distribution of stress is relatively more complicated even under dead load, so it is necessary to distribute emulation analysis to the real stress of curved box bridge.

但是钢箱梁是典型的空间薄壁杆件，由于弯一扭耦合作用，曲线钢箱梁即使在恒载作用下其应力的分布也比较复杂，因此有必要对曲线钢箱梁实际的应力分布进行仿真分析。

Usually the crane driver can check the approximate weight of the carried load on a display in his cabin.

通常，起重机的司机可以在自己座舱的显示器上检查所载负荷的大体重量。

Usually the crane driver can check the approximate weight of the carried load on a display in his cabin.

通常，起重机的驾驶员可以在驾驶室内的显示器上确认所载负荷的大致重量。

And then the power of servo motor is calculated according to crank press working load , kinematical characteristic, torque and rotational momentum.

以变速驱动压力机的工作负荷、运动特点、工作总功、力矩和角动量为基础，计算其驱动电动机所需的功率。

As far as province, land use and water system are considered, Sichuan province, crop land grass, Jinsha river and Jialing river are important contributories of NPS pollution load in study area.

就省份、土地利用类型和水系而言，四川省、种植用地和草地以及金沙江水系和嘉陵江水系对长江上游的非点源污染贡献较大。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。