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Through analyzing the topology, control system and protection system of large power high voltage converter equipped with integrated gate commutated thyristor, a set of 7.5 MVA three-level neutral point clamped converter was designed.

通过对大功率集成门极换向晶闸管高压变流器的结构、控制系统、保护系统的研究，设计出一套7.5MVA的基于集成门极换向晶闸管的高压三电平中点箝位变流器。

The thin welded pipe is also advantageous in resistance to cracking caused by accumulation of strains introduced during roll-forming, swaging both ends of the welded pipe and hydraulic expansion.

薄的焊接管还有利于在滚轧成型、锻压焊接管的两端和液压膨胀过程中抑制由于导入应变的积聚而产生的破裂。

Sets of back-pressure adjustment: adjustment of the auxiliary back-pressure valve, through the back-pressure adjustment sets of adjustments, will be back at the appropriate pressure.

安全阀的出口必须装设适当的膨胀节，以防止排放管的热膨胀给安全阀带来不应有的热应力。排放管内径应比阀门出口直径大，长度尽可能短，避免拐弯。

As a result, the conclusion on boiler tube failures mod...

取得以下研究成果：(1)对受热面管的主要失效模式进行了分类，针对工业锅炉和电站锅炉的不同特点，系统地研究总结各种失效的机理，为建立受热面管的失效预防措施提供了理论指导。

Related to the production of high-pressure boiler tubes there are many problems, the following LU Hong technology we produce some of our experts to explain the production of high-pressure boiler tube problems

有关高压锅炉管的生产存在着诸多的问题，下面我们鲁宏的技术生产专家来详解一下我国高压锅炉管生产存在的问题

The dependence of discharge capacity on the reduction potential of the dye redox couple is compared for TiO2 and TiO2–SWCNT systems under equilibration conditions.

研究人员表示，&单壁碳纳米管接收和转移电子的能力凸显了它在电子转移过程中的中介作用。单壁碳纳米管的充放电特性将在提升光电转化方面起到重要的作用。&

Nner Mongolian fine wool wethers of two years old with permanent ruminal and duodenal cannulas, divided into 4 groups of 3 at randomly, were used in this trail.

·一 试呛三：不同日粮阴阳离子水平的对绵羊生产性能及氮平衡的迈响选用12 ／q安装有永久性瘤胃窿管及十二指肠疹管的内蒙古半细毛羊渴羊，随机分成4组，每组3个重复，饲给4种不同阴阳离子水平日粮，以研究在大量饲g玉米秸秆条件下DCAB对绵羊干物质采食量（DMI人体重变化及氮平衡的形响。

Increasing the length may enhance the gain of low and high frequencies when external acoustic meatus is wider, but only low fiequecies when narrow.

结论当外耳道较为宽大时，增加声管的长度可以提高低频和高频的增益；当外耳道较为狭窄时，增加声管的长度仅能提高低频的增益。

Importantly the combination of clear cap (52) and steel feed tube provides all of the advantages of both, that is, adequate strength in the feed tube and knife and the ability to see under the cap.

重要的是透明的聚合物盖52和钢进料管的组合提供两个优点，即进料管和刀片有足够强度，和能查看聚合物盖下面的情况。

This utility model involved a sort of rotary tillage fertilizer distributor , belong to agricultural machinery ,it maked up of rototiller , fertilizer-discharged device and gearing ;the horizontal and uprightness packing auger are installed in the fertilizer-box and the fertilizer-discharged duct of fertilizer-discharged device ,the gear case connected fertilizer-box and fertilizer-discharged duct ,it is power transmission device and fertilizer discharged duct it can use kinds of powder and granular fertilizer this machine structured simple , fertilizer discharge reliable , and full used existing equipment

本实用新型涉及一种旋耕施肥机，属于农业机械，它由旋耕机加装排肥机构及其传动装置而成；其排肥机构的肥箱和排肥管中分别装有水平绞龙和垂直绞龙，联接肥箱和排肥管的齿轮箱，既是传递动力的纽带，又是排肥的通道可施用各种粉状和颗粒状化肥该机结构简单，排肥可靠，且充分利用了现有机具

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。