有效部分

The calculated results showed that the negative pressure and the water column separation in local salience could be avoided when the pneumatic tank was mounted near pumps for the raising of minimal water hammer pressure on long pipeline.

计算表明：补给水泵出口附近装设气囊式空气罐后，提高了长距离管道中的最小水锤压力，能有效避免凸起部分出现负压及水柱分离。

This research adopts the impedance marching method, by varying duty cycle in a DC-DC converter to make the apparent load impedance matching with current system impedance, and reach the mpp operation.

控制电路的部分由单晶片PIC18F452为中心，重点为如何有效的取得太阳电池的开路电压及短路电流，以便正确计算出太阳电池的内部阻抗。

A shear groove in the external casing or other appropriate means so arranged that should the valve casing be removed by a severe impact the sealing capability of the valve closure shall not be affected.

e阀外壳应有削弱部分，当在强烈撞击下阀壳被折断时，内部截至阀应保持有效关闭。同时，阀门的操作机构不能直接连接阀板。

Today South Africa provides Mr Mugabe with the most effective international cover for his misrule, in part because Mr Mbeki, seeing in Zimbabwe a mirror of his own country, dreads the idea of a trade-union leader overturning the rule of an independence party.

今天南非为穆加贝的暴政提供了最有效的国际照顾，部分因为姆贝基把津巴布韦看成自己国家的一面镜子，害怕商会领导人的思想颠覆这种一党专政的统治。

The traditional Rural Corporation Medical system referred to setup, personnel, money and so on. Among them, the most representative and the most living parts are the barefoot doctors, the money for the corporation and the movement "San tu, Si zi". The system, as an effective way of controlling the society and regulated system, was studied from these parts, which is the main idea of the paper. In the meanwhile, to show the historic features of the system, the environment and other factors must be included, like social culture, social psychology, the change of rural structure and the rural three-class medical net.

传统农村合作医疗制度涉及机构、人员、资金诸多方面，其中赤脚医生、合作医疗基金、&三土、四自&群众运动可以说是制度中最具代表性、最生动的部分，把农村合作医疗制度作为一种管理和控制社会的有效方式和规范体系，以此为切入点进行历史考察，是本文的指导思想；同时，全方位展现这一制度的历史面貌还必须包括对制度外围环境诸多因素的研究，如社会文化和社会心理、农村社会结构的变迁、农村三级医疗卫生网、农业合作化运动等。

Based on both the strong-weak model and the strong-strong model, the instability caused by ions in equilibrium is simulated, some useful results are obtained. The results include the relation between instability growth rate and neutralization factor, the relation between instability threshold and neutralization factor, and the incoherent tune shift, the tune spread, the ion cloud distribution, the ion loss mechanism, as well as the ion accumulation limitation in the storage ring. With this understanding, we have carried out theoretical and experimental study for some ion clearing methods and their effects for the HLS ring. The minimum static clearing voltage is determined through calculating beam electric field and measuring ion current.

在上述基础上，我们对各种离子清洗的方法及清洗效果进行了理论和实验的研究：通过计算束流电场和测量清洗电极上的离子流来确定直流清洗电极所需的最小清洗电压；通过测量离子引起的频移来计算储存环的中性化系数；用模拟计算和实验测量证实了高频清洗能有效地克服储存环上离子俘获不稳定性；对由高频剔除系统形成的储存环部分束团填充模式下的离子俘获问题进行了初步研究，证实采用束团部分填充模式能在一定范围内克服离子俘获效应；并对各种离子清洗方法进行了比较。

Thirdly, according to the principle of lightning channels moving from the largest direction point of electric-field, we figure out lightning strike selectivity when lightning leader has different height and level distance to ground object, using the ANSYS software.

第三部分根据雷电通道按照最大场强方向走向的原理，利用ANSYS软件进行有效的分析，仿真出雷电先导在目的物高度不同情况下的雷击选择性。

Although forest canopy layer could prevent splash erosion effectively, clay was taken away by overland flow and run off easily, the erosion amount became less after removing the forest canopy and surface soil, while the splash erosion still produced in the surface layer; the splash function weakened after having water current, the starting particles were less than bareland, so removing the surface disturbed soil made the erosion amount and clay less, silty sand more than bareland, but unsteady, the wear and tear energy used by raindrop splash and current function for overcoming sediments separating and starting were comparatively large, sediments were very difficult to be started and transported, it explained that forest root systems could increase anti-erosion capability of forest vegetation, make rainfall-current system splash and export finer particles than bareland.

虽然林冠层能有效防止溅蚀的发生，但坡面流还是能带走粘粒部分，粘粒还是容易流失。去除林冠和表层土后，侵蚀量变得更少，但表层还是会被溅蚀，有水流后，溅蚀作用减弱，颗粒起动的比裸地的少，所以，去除表层扰动土后，侵蚀量更少，粉沙多，粘粒比裸地更少一些，但不稳定，雨滴击溅和水流作用用于克服泥沙分离起动损耗的能量较大，很难被起动输移，这说明森林植被根系的作用增加了林地植被的抗蚀力，使降雨一水流系统仅能溅起输出比裸地坡面更细小的泥沙颗粒。

The design and implementation of automobile engine speed indicator is given, which uses PWM method to directly realize stepper motor drive in micro-step .

本文介绍了通过PWM脉冲实现步进电机微步驱动的原理，并给出了一个采用PWM调制方法直接实现步进电机微步驱动的汽车发动机转速表的设计与实现，该设计以软件的算法处理代替了部分相关硬件功能，在保证系统可靠性的前提下有效地降低了仪表成本。

According to the characteristics of large span structure design, such as big diffrence of collumn force, large span and spacious roof, week linkness of different parts and large displacement of bearing, spacil structure methods such as different types of concrete pile with different length, suitable joint and bearing are adopted to achieve the economical and safe demand

提要］针对西北农林科技大学体育馆类大跨度空旷建筑结构的设计特点，如柱底内力差别很大、上部结构空旷、各部分之间的连接较弱、屋盖结构跨度大、支座位移大等，采取差异化的桩型和桩长，适当分缝，合理配置支座等有效的结构措施，达到既安全可靠、又经济性好的目的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。