查询词典 efficiency

This paper presents a new approach, Fibonacci sequence based on-line efficiency optimization control, for improving the efficiency of induction motor drive systems.

提出一种基于斐波那契数列的寻优方法来提高交流电机驱动系统的效率。

The experimental research on the EAF probability density has shown that the emission characteristics of gasoline engine can be defined by the probability density, which has correspondent relations with catalyst efficiency index. The catalyst efficiency can be predicted through the calculation, so it is useful to the catalyst application.

过量空气系数概率密度的试验研究表明以概率密度对汽油机排放特点进行量化，通过它和催化转化器综合效率指数的关系，推测催化转化器效率情况，对匹配研究具有指导意义。

Milling groove machine is used in processing weaving trade in " pin plate " use privately cut machine tool, belong to the modular machine tool, this machine tool have 4 works position and 8 milling heads, can at the same time process 8 workpieces, have higher processing efficiency and processing precision, and can at the same time still realize needle groove and circular arc groove same work position, it surmounted the shortcoming of that machining process complex, processing efficiency low and process precision do not be in height of the processing of pin plate beforetime, so it have better application prospect.

铣槽机是用于加工纺织业中&针板&的专用切削机床，属于典型的组合机床，该机床具有四工位、八铣头，能同时加工八个工件，具有较高的加工效率和加工精度，同时还能实现针槽与圆弧口槽同工位一次完成，克服了以前针板加工中加工工序复杂、加工效率低、加工精度不高的缺点，有较好的应用前景。

Efficiency, fair meaning efficiency has double meaning.

效率、公平的含义效率具有双重含义。

The approximate digestibility of antlions was not significantly different among the four insect diets, however, the utilization efficiency and the transformation efficiency were highest in those fed on M.

同时食物消化利用的结果显示，用4种饵料饲养蚁狮，它们的近似消化率差异不显著，但食物利用率和食物转化率均以家蝇幼虫饲养的蚁狮最高。

But market efficiency is not the fact or truth, there should be three necessary conditions to attain market efficiency:(1) There should be enough investors to create liquidity;(2) there should be enough arbitrageurs to correct the distortion of market;(3) the information relative to the stock price must be obtained by all investors reliably, completely and timely.

然而，市场有效并不是想当然的一个既定前提或事实，市场达致有效的三个必要前提是：（1）有足够数量的投资者创造流动性；（2）有足够数量的理性套利者校正市场的扭曲；（3）与股票价格相关的信息必须可靠、完整、及时地被所有投资者获得。

By combining electrical and thermal efficiency, we can get a fuel cell efficiency of up to 85%.

结合电热效率，该装置可以得到的燃料电池效率高达85%。

This paper attempts to associate PFC technology with Quasi-Resonant DC/DC Converter and Synchronous Rectifier technology, to work out a novel switching power supply with higher efficiency and low contamination, which both achieved high power factor, improved effecting on electrical network and ensured high efficiency, furthermore, it is easy to be realized and controlled in circuit.

本文首先阐述了开关电源、功率因数校正技术和同步整流技术的发展及现状，对DC/DC变换的拓扑结构进行了选择，确定了带有隔离的准谐振(Quasi-Resonant)反激型电路，可以有效地降低损耗；接着本文对几种常见的PFC拓扑电路进行分析对比，从中选择了BOOST型电路，对工作在临界状况下的电路进行了分析，采用跟随输入电压的升压变换新技术，减小了电感体积，同时降低了开关管的电压应力，既简单又有效地实现了功率因数校正，并发现此技术值得推广；由于反激型变换器的效率一般都较低，所以本文在传统同步整流技术基础上对其加以改进，设计出一种新颖、高效的同步整流方案。

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%。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。