查询词典 efficiency

A new type high efficiency synchronous step-up DC/DC converter for hand-held device is designed in this thesis. It works in the PFM mode, and its switching frequency can up to 500 KHz. It offers a built-in synchronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode and improves overall efficiency by minimizing losses.

本文设计了一种用于移动电子设备的高效同步整流的DC/DC升压芯片，该芯片采用PFM调制方式，工作频率最高可达500 KHz，内部集成功率管作为同步整流管，代替传统的肖特基二极管，导通电阻仅有0.4？

The results show that the beam-wave efficiency is not sensitive to the velocity spread, but is dependent on the period and depth of the helical corrugations, and that the efficiency in the present experiment may achieve 25.6% by optimizing the helical corrugation parameters.

结果表明：螺旋波纹壁圆柱波导回旋行波放大器效率对电子束速度离散不敏感，而对螺旋波纹开槽周期和开槽深度的依赖性较强；通过参数优化可望把目前实验的效率水平提高到25.6%。

To estimate the quantitative genetic parameters of nitrogen use efficiency, twenty maize single-cross hybrids with varying nitrogen use efficiency were tested at two locations in the North China Plain. At both locations, the hybrids were grown under high (HN, 225 kg/hm^2 N) and low N levels. And no N fertilization on the LN field have lasted two years.

为研究玉米品种氮利用效率相关性状的遗传参数，本试验选择20个具不同氮利用效率的单交种在华北平原的2个地点同期进行试验，氮肥处理设高氮（施氮，折合纯氮225 kg/hm^2）和低氮（不施氮，其地块经过连续2年耕种使氮素耗竭）2个水平。

Efficiency of technology and evaluations of the efficiency by evaluators constitute the sufficient and necessary conditions for the formation of technology norm.

技术的高效用性和评价主体对这种效用的评价，共同构成了技术规范形成的充分而且必要的条件。

The impacts of definition, complexity, development efficiency, runtime efficiency, extendability and maintainability of applications are considered in the thesis.

通过综合考虑应用程序结构的清晰度、复杂度、开发效率、运行效率、可扩展性和可维护性等多方面的因素，WBDS形成了独具特色的部分允许跨层调用的分层体系结构。

In order to analyze the relationship between radiation heat transfer and thermo-efficiency, the radiant heat flux of the cylinder and thermal balance are measured. The results show that: The reduction of thermal radiant flux in the cylinder is the primary cause of the improvement of thermal efficiency of the engine.

为了研究发动机热效率和辐射传热量变化之间的关系，利用辐射传感器测量了柴油机燃用DMC柴油混合燃料后缸内辐射传热量，进行了热平衡实验，分析结果表明，添加含氧燃料后，发动机缸内辐射传热量的减少是导致其有效热效率的提高的主要原因。

Efficiency of radiant energy conversion It is possible to calculate the efficiency of photosynthesis.

辐射能转换效率计算光合作用效率是有可能的。

If the efficiency of the refrigerator is not high, particularly long-hum, nor particularly large, if the heat pipe vacuum cleaner dust吸掉, it will improve the efficiency of refrigerators, but also to reduce the magnetic field at home.

如果冰箱的效率不高，嗡嗡声就特别久，也特别大，如果用吸尘器把散热管线上的灰尘吸掉，就会提高冰箱的效率，也减低家中的磁场。

The maximum theoretical efficiency for a photovoltaic cell is only 32.3%3, but at this efficiency, solar electricity is very economical.

一个光电池最大的理论效率仅仅是32.3%3，但是在这个效率，太阳电能是最节约的。

Due to its high cost and low photovoltaic conservation efficiency, the percentage of solar cell is less than one. Because radiate density of sun's rays is too low, solar cell's photovoltaic conservation efficiency is low too.

但是太阳能作为社会整体能源结构的组成部分所占比例而不足1%，造成这种状况的主要原因是太阳能电池的成本较高和太阳能电池的光电转换效率较低。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。