效率高

This topic uses the switching mode is the entire bridge all controls the rectification filter, moreover the power source has also utilized the soft switch technology, causes its loss to reduce obviously, the DC-DC transformation use cuts the wave boosted circuit to realize, the structure is simple, the transfer efficiency is high; Selects the small breakover resistance, the high shutter speed P60N06 tube for the switching valve, to select the quick recovery diode rectification, reduces the reverse breakover time, reduces the loss.

本课题采用的开关方式是全桥全控整流滤波，而且电源还运用了软开关技术，使它的损耗明显降低，DC-DC变换使用斩波升压电路来实现，结构简单，转换效率高；选用小导通电阻、高开关速度的P60N06管为开关管、选用快速恢复二极管整流，减少反向导通时间，降低损耗。

Comparing the synchronous rectifier to normal circuit by calculating the efficiency indicates that forestay is much better on efficiency and thermal performance. A simple circuit with good consistency, high efficiency, high reliability and low cost is presented in this paper. The feasibility is proved by emulating with computer.

通过分析已有的集中解决隔离型变换器输出带预偏置电压启动的解决方案，提出了一种全新的一致性好、成本低、效率高、简单和可靠性高的解决隔离变换器输出有预偏置电压的启动问题的电路，通过仿真验证了其可行性。

The results of interior ballistic theoretical simulationindicates that the single PSS charge application need propellants be provided with upperburning rate, adopting PSS and traditional model frame propellants commix charge is apractical applied technique approach.. By optimizing the PSS model frame parameter, wecan obtain "flat roof" domino offect with better even peak value "double peak" p-tcurve. Comparing with current 19 hole propellants charge with the best increasing burningsurface characteristic, the muzzle velocity of projectile can be enhanced about 55m/s, andthe instruct pressure efficiency can be enhanced about 5.7％.

内弹道理论模拟结果表明，PSS发射药单一装药的应用，需要发射药具有较高的燃烧速度，采用PSS发射药与传统药型的混合装药，是目前PSS发射药实际应用的技术途径，通过药型参数的优化可获得"平台"效应更好的等峰值的"双峰型"P～t曲线，与现有增面性最好的19孔发射药装药相比，弹丸初速可提高55m／s左右，示压效率高5.7％左右。

This system improved the evaluation of teachers in traditional way,and it has characteristics as follow: data accessing is faster, even higner efficiency, more conveniency and haste.

系统主要是对传统的教师评估方式进行了系统化的改良；因此本系统相对于传统的评估方式而言具有以下特点：数据的存取快、效率高、更方便、快捷；它相对于网络评教的最大的优点在于数据的可信度和准确性要高很多；系统利用纯JAVA语言结合有效的对数据库ACCESS进行操作的SQL语言实现其基本的功能。

A simple and practical method to reequip the hobbing machine by using CNC system to machine the crown gears is introduced. It has advantages of high machining quality and efficiency, high stability and reliability, simple operation, good adaptability to different lots, easy to realize, low cost and high benefit. It is an economical and efficient technique to machine crown gear. It is of particular extending value, meeting the domestic needs of crown gear coupling manufacturing.

介绍了一种新开发出的简单实用的数控化改造普通滚齿机加工鼓形齿轮的方法，它具有加工质量好、生产效率高、系统稳定可靠、操作简单、产品批量适应性强、改造容易实现、改造成本低、效益高等优点，是一项经济有效的鼓形齿轮加工技术，适合现阶段国内鼓形齿联轴器制造的要求，具有较高的推广应用价值。

Internal form a high degree of mechanization, the division of fine, close cooperation with, efficient organic whole.

内部形成一个机械化程度高、分工细、协作配套紧密，工作效率高的有机整体。

A "slide Law," and bagged concrete slope protection works to achieve a one-stop streamlined, with a high degree of mechanization, construction speed, high efficiency and good quality characteristics of

采用"滑道法"进行模袋混凝土护坡施工，实现了一条龙流水作业，具有机械化程度高、施工快捷、效率高、质量好的特点。

The laser does not need any thermal len and thermal double refraction compensation element, having high output power, better beam quality, high doubling efficiency, better stability, widely applied in medical, industry.

该激光器不需要任何热透镜和热致双折射补偿元件，具有输出功率高、光束质量好、倍频效率高、稳定性好，医疗、工业应用性强等优点。

As a promising energy storage element, Electric Double Layer Capacitor has thevirtues of both high energy density of battery and high power density of electrolytic capacitor.Moreover, it has long cycle life, high storage efficiency, sound temperature adaptability andenvironmental character.

双电层超级电容器兼具蓄电池能量密度大和电解电容器功率密度大的优点，循环寿命长、储能效率高、充放电速度快、高低温性能好、环境友好，具有卓越的储能潜力。

Its simple structure, low loss, high power factor, high efficiency, high power density characteristics significantly.

其具有结构简单、损耗小、功率因数高、效率高、功率密度高等显著特点。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。