查询词典 efficiency factor

Therefore, in this paper a new mechanics method is studied, i. e. a group of equations were set up and solved by the equilibrium conditions of the couple system. The transmission ratio and the meshing efficiency calculation formula were derived by this method. According to the law of conservation of energy. Hence then the above profound problems are analyzed and solved in a simple way. epicyclic gear train ; couple system ; transmission ratio ; meshing efficiency

故根据平面力偶系平衡条件可以很方便地推导出轮系传动比和啮合效率公式，与其它方法[卜3]不同之处还在于，本文根据能量守恒定律，不需分析啮合功率的流向，便可解决啮合效率的计算问题。1理论基础1.1基本周转轮系的力矩关系式图1为常用的2K—H型基本周转轮系，当轮系匀速转动工作时，根据受力平衡条件，作用在▲图l 2K_H基本轮系三个基本构件上的力偶矩应满足以下关系式[1]：兰=簇=撬㈤一1一涅稍一1一涅稍

Two using modes for double glazing curtain wall and double facade glass were described, which can attract peoples' attention in the field of architecture to energy efficiency of glass and promote the development of building energy efficiency in our country.

通过对双层玻璃幕墙以及双层立面2种节能玻璃的使用方式的阐述，以期引起相关人士对玻璃节能的重视，从玻璃产品及节能方式两方面进行创新，从而促进我国建筑节能事业的发展。

The following main results are obtained: The TiO_2 photocatalyst with small crystallite size, high surface area, narrow and uniform pore size distribution, and microporous frameworks could be prepared out by applying MW radiation in the preparation process. The microwave-induced fluorescence technique verified for the first time that microwave enhanced the formation rate of hydroxyl radical, leading to the increase in the photocatalytic efficiency. Compared with the conventional catalyst, TiO_2 prepared by MW dielectric heating owns a higher UV absorption ability, and its optical absorption edge and photovoltaic response are shifted toward the short wavelength region, resulting in increase of photooxidation efficiency. The photocatalytic conversion and the mineralization ratio of acetaldehyde are increased respectively by 30% and 40% over the TiO2 prepared by MW radiation when compared to the TiO2 prepared by the conventional heating. For the MW-assisted photocatalytic reaction over the MW-prepared TiO2, production of hydroxyl radicals is enhanced by 22.5%, and the photocatalytic conversion is accordingly increased by 20%. Similarlly, applying MW also increased the photocatalytic conversion and the mineralization ratio of acetaldehyde over TiO2/Al2O3 sample.

论文得到如下主要结果和结论：(1)微波介电加热TiO_2 溶胶可得到晶粒度小、光催化活性高、比表面积大和孔径分布窄而均一，且微孔发达的TiO_2光催化剂；在溶胶干燥处理过程中微波可使催化剂表面缺陷增加，进而导致光催化反应过程有更多的活性羟基自由基产生；(2)微波制备能显著增强TiO_2 样品的紫外光吸收率，并使其光吸收和光伏响应阈值发生蓝移，从而提高TiO_2的氧化还原能力；(3)与常规加热法所制TiO_2比较，微波法制备的TiO_2对乙醛的光催化降解转化率提高30%，CO_2生成率提高40%以上；(4)与未加微波辐射时相比，发现在光催化反应过程中施加微波，TiO_2 的羟基自由基生成速率提高了22.5%，相应CH_3CHO 光催化降解转化率提高了20%；对Al_2O_3/TiO_2催化剂，CH_3CHO 光催化降解转化率甚至提高了33%，同时CO_2 的生成率也都大幅度提高；(5)微波辐射可改变光催化降解乙醛的产物分布，推断施加微波时乙醛光催化降解按照羟基自由基引发的链式反应机理进行，微波&非热效应&起主要作用。

However, in natural ecosystems phosphorus tends to disappear during the course of elemental cycle in chemosphere, meanwhile most of phosphorus in soil is unavailable to plants, and phosphorus fertilizer use efficiency was always not higher than 20 percent, as a result there is a profound significance to exploit the huge soil phosphorus bank and improve fertilizer use efficiency via biological ways.

然而，自然磷矿资源正趋于耗竭，与此同时，土壤中的磷大部分以植物难以直接利用的形态存在，并且投入土壤中的磷肥利用率一般不足20％。

This dissertation sets up a physical model consists of the caudal fin, the muscles and the spring, and also gives a mathematical model of the optimal compliance of the spring. Some simulations are carried out. The simulation results says that the elastic element can increase the propulsion efficiency, which provides a technical way for promoting efficiency of underwater propulsors.

本文给出了一种含有弹性元件的肌肉—弹性元件—尾鳍的物理模型，在游动能量损耗最低条件下，建立了求解弹性元件最佳柔顺系数的数学求解模型，并进行了仿真研究，研究结果验证了弹性元件对提高推进效率的作用，为提高仿鱼水下推进器的推进效率提供了一种技术上的解决途径。

At 623 K, NO removal efficiency avg.≒39.7% and at about 12% O2 reacted efficiency.

在623 K时，NO在500~7000秒的平均去除率39.7%，O2的平均利用率12%。

The concerned standards for CACUs at home and abroad are discussed in detail, and the energy efficiency status of actual units are also analyzed. Then it is concluded that energy efficiency requirements for Chinese CACUs must be stricter.

详细讨论了国内外空调机组相关标准，并系统分析了实际产品的能效现状，认为必须提高我国空调机组的能效要求。

The model is used to calculate theoretical EERs of units with different design options. Afterwards a study is performed to determine the payback periods and life cycle costs corresponding to theoretically calculated EERs, which finds out technical feasibility is prior to other factors when establishing EESs for CACUs. Finally, new energy efficiency standards and energy efficiency grades for CACUs are presented based on the aforementioned researches.

利用该模型计算了机组不同设计方案理论上可达的能效比；然后通过分析获得相应能效比所需的回收期以及不同情形下的生命周期成本，发现制定空调机组能效标准应着重考虑技术可行性；最后在上述研究的基础上提出了空调机组新的能效限定值及能效等级。

The maximum theoretical efficiency is equivalent to the Carnot cycle, however the efficiency of real engines is only a fraction of this value, even in highly optimized engines.

最高理论效率相当于卡诺循环，但效率的真正的发动机是只有一小部分的价值，即使是在高度优化的引擎。

Starting from the graphs of P-V and T-S and the second law of thermodynamics, and on different aspects and with different methods, this article studies the maximum value of the efficiency of heat engine in the process of arbitrary cycles, and presents the conclusion that the efficiency of the heat engine in Carnot cycle is the greatest among all arbitrary cycles.

卡诺定理给出了热机的循环效率极大值问题。由P-V图、T-S图、热力学第二定律出发，从不同的角度，采用不同的方法，对任意循环过程的热机效率极大值问题进行了研究，证明了任意循环过程热机效率以卡诺循环的热机效率为最大极限值的结论

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。