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This paper introduces the principles of comprehensive substation voltage and reactive power control, and proposes the hardware structure and characteristics of the high performance MVR-Ⅲ series of this type of systems. It is emphasized that the special harmonic analysis and monitoring function of this system plays a very important role on safety of the reactive power compensa- tion equipment.

简要介绍了变电站电压、无功综合控制的原理，介绍了高性能的MVR-Ⅲ型系列装置的硬件结构及其性能、特点，强调了该系列装置特有的谐波分析和监视功能对无动补偿设备的安全有着极为重要的作用。

Based on the theory of instantaneous reactive power, the multiple frequency rotate transform theory is put forward. It overcomes the defect of that the theory of instantaneous reactive power can only measure the harmonic total amount. The positive sequence and negative sequence k-multiple frequency rotate coordinate is respectively put forward in detail.

倍频旋转变换理论是基于瞬时无功功率理论提出的，它克服了瞬时无功功率理论测量方法只能测量谐波总量的缺陷，该理论分别针对正序谐波和负序谐波，提出正向和负向倍频旋转坐标，通过k—倍频旋转坐标可将k次谐波分离出来。

With the merits of space vector modulation: digitized control,harmonic decrease,high ratio of voltage used,fast dynamic response and so on,and at the same time deadbeat and DSP control is introduced, as well as two-loop control of the system,we gained power factor is near unit and current THD is well below 10% in our digitized arc welding power system.

基于空间矢量脉冲宽度调制技术的易于数字化、可降低谐波、电压利用率高、动态响应快等特点，引入无差拍思想、总体系统的双环控制思想和DSP控制，实现了功率因数为1，电流谐波畸变远小于10％弧焊电源系统的数字化。

This system carried on the analytical and concrete design of detailed need according to the objective demand of each big business enterprise, for example the system managing person class has the legal power of the tallest Class, can use the function of the havings of the system;Generally the managing person has to use the legal power generally, can search the basic information, and personal opinion of feedback, send out to serve to request etc..

本系统根据企业的客观需要进行了详细的需求分析和具体的设计，比如系统管理员级具有最高级别的权限，能使用系统的所有的功能；一般管理员具有一般使用权限，可以查询基本的信息，及反馈个人意见、发出服务要求等。

N transfer Taocha Headwork water diversion project is run by the State Council approved the construction of the national large-scale water conservancy project is a project of N transfer an important part of both the water diversion project Headwork middle main channel Butterfly Valveswater diversion headworks but also Danjiang auxiliary dam reservoir engineering design for the new site redevelopment and build more power stations buildings are mainly cited sewers grvity induced gate stilling basin power plant and management of space and so on.

南水北调中线陶岔渠首枢纽工程是经国务院南水北调办批准建设的国度大型水利工程，是南水北调中线一期工程的重要状干部分，渠首枢纽工程既是南水北调中线输水总干渠的引水渠首，也是丹江水库的副坝，工程设计为新址重建，并增建发电站，建筑物主要有引渠、重力坝、引水闸、消力池、电站厂房和治理用房等。

Solar thermal technology is one of the lowest cost one among the solar technology, this paper introduces the system design of solar thermal power tower, heliostat technology, master control technology, receiver technology and other key technologies basing on China's First Solar Thermal Power System, especially the curved reflector shaping method, the design of non system error mechanism, program calculation associating with sunlight sensor control technology of the heliostat, and the forced air cooling tech...

太阳能热发电技术是成本最低的太阳能利用技术之一，本文以我国第一座塔式太阳能热发电系统(70kWe)的研发建设为基础，介绍了塔式太阳能热发电的系统技术、定日镜技术、集成控制技术、接收器技术等关键技术的研究，特别是定日镜的曲面镜成型技术、无系统误差的机构设计、程序计算和太阳光传感器联合控制技术，以及接收器的玻璃窗口风冷技术、结构设计技术、蓄热技术等。

This article at last argues that the operation of the power in the rural china governance is based on the control of political information, and the asymmetry of which between the hierarch and the public insures the sound operation of power.

并指出，在中国的乡村治理中，权力的运作是以对政治信息的控制而实现的，而掌权者和民众之间的信息不对称则实现了权力的正常运行。

This paper mainly researches on the interleaved boost circuit of the high power direct drive wind power system.

主要研究了应用在大功率直驱式风力发电系统中的交错Boost电路。

China's use of a high-tension power grid as opposed to more expensive underground cables, and its crushing dependence on coal – for 80 percent of its electrical power – left it especially vulnerable to the storms.

中国使用的是一种高压电网而不是较为昂贵的地下电缆以及其极度依赖煤炭-供其百分之八十的电力-使得它在暴风雨中特别容易受到攻击。

Concrete details are:(1) The Clap skates elevate the flexibility through the link structure of the "hinge", thus change the malpractice of traditional push-off process which mainly depends on the power of the hipbone and the knee, and thus obstruct the use of the power of ankle.

具体表现为：（1）Clap式冰刀通过"铰链"连接结构，提高了踝关节的自由度，改变了传统冰刀在蹬冰过程中主要发挥髋、膝关节的力量，而难以利用踝关节力量的弊端，在增加做功环节的同时又加大了膝关节的工作范围。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。