性能说明

We can't think of any reason, structurally or acoustically, why oil is bad for a guitar.

不论从结构上还是声学性能上说，我们都想不出任何道理说明油对吉他不好。

This article introduces the performance and use of the air brick detailedly ,as comparing with solid brick to explain it more,emphasis on the introduction of coal waste air brick ,and longing for the desirable developmental foreground which is supposed to be potential,just the architectural newly prevail materail--dark hourse.

在本文中详细介绍了空心砖的性能和用途，并和实心砖进行比较说明，重点介绍了煤矸石空心砖，对空心砖的发展前景看好，未来发展前景很好，是近年来建筑新兴材料的黑马。

Based on a modified algebraic Riccati equation, this paper provides the conditions for the existence of the previous performance robust controllers.

基于一个修正的代数Riccati方程，给出了上述性能鲁棒控制器的存在条件及解析表达式，并举出相应的数值例子，以说明本文设计方法的简单性与直接性。

The calculation results agreed well with the experimental data, which supplied an alterative way to the selection of wall-facing materials and the assessment of the building micro-heat environment.

说明高反照率的浅色墙面材料具有夏季隔热、冬季保温的性能，能够有效地缓解城市热岛效应，实现建筑节能的目标。

By means of generalized Lyapunov function and linear matrix inequality,the asymptotical stability with zero solution is studied for the system,and a sufficient condition is given such that the system is asymptotically stable with zero solution and also a H∞ norm constraint .

针对非线性离散广义系统研究了状态反馈H∞控制器的设计问题，利用广义Lyapunov函数和线性矩阵不等式，首先对系统的零解渐近稳定问题进行了研究，并在此基础上给出了系统的零解渐近稳定且具有H∞范数约束的充分条件，之后设计了状态反馈H∞控制器，使闭环系统具有同样的性能，最后给出了数值算例说明本文结论的有效性和可行性

states the characteristics of the condensing-temperature control in variable condenser water flow of central air-conditioning systems. analyses the effects of variable condenser water flow on cop of centrifugal chillers. indicates that although the negative effect is not negligible, it is less than the positive effect on pump's energy-saving and the condensing-temperature control is helpful to the resulting energy-saving for air-conditioning systems by combining with an example.

摘 要：论述了在集中空调冷却水变流量系统中冷凝温度控制法的特点；分析了冷却水变流量对离心式制冷机性能系数的影响；结合实例说明虽然冷却水变流量对于冷水机组制冷性能的负面影响不可忽略，但这一负面影响较对于水泵节能的正面影响要小，采用冷凝温度控制法对于空调系统综合节能是有益的。

States the characteristics of the condensing-temperature control in variable condenser water flow of central air-conditioning systems. Analyses the effects of variable condenser water flow on COP of centrifugal chillers. Indicates that although the negative effect is not negligibleit is less than the positive effect on pump's energy-saving and the condensing-temperature control is helpful to the resulting energy-saving for air-conditioning systems by combining with an example.

摘 要 论述了在集中空调冷却水变流量系统中冷凝温度控制法的特点；分析了冷却水变流量对离心式制冷机性能系数的影响；结合实例说明虽然冷却水变流量对于冷水机组制冷性能的负面影响不可忽略，但这一负面影响较对于水泵节能的正面影响要小，采用冷凝温度控制法对于空调系统综合节能是有益的。

The results show that the flow area and the high speed of the solenoid valve are the key factors in all of the factors, in order to improve the performance of the system, a high speed and great flow area solenoid valve must be used.

对所得到的优化结果分析说明，控制电磁阀的通流面积和响应速度是影响系统工作性能的最为关键的参数，要提高系统的工作性能必须要选用高速大流量电磁阀。

The results indicate that the cell only doped with Al2O3 (Cell 1) is of the worst output performance at 850 ℃, the output power density being 0. 083 W/cm^2, and that the cell doped with Al2O3 and coated with buffer layer (Cell 2) is of the best output performance at the same temperature, the output power density being 0.120W/cm^2. AC impedance spectroscopy analyses indicate that the interface resistance and Ohmic resistance of Cell 2 are obviously less than those of Cell 1, meaning that insulative nickel aluminum spine1 is generated by the reaction of Al2O3 and NiO during the sintering at a high temperature.

结果表明：850℃时，含Al2O3的电池输出性能最差，输出功率约为0.083 W/平方公分；含Al2O3并具有过渡层的电池输出性能最好，输出功率约为0.120 W/平方公分；交流阻抗谱分析表明，含Al2O3并具有过渡层的电池的欧姆电阻与界面电阻均比不含过渡层的明显减小，说明YSZ中添加的Al2O3在高温烧结过程中，与阳极材料NiO发生反应生成不导电的镍铝尖晶石。

Computational results prove that the local search methods can preferably improve the performance of particle swarm optimization, and hybrid particle swarm optimization based on the local search method outperforms GA and NEH heuristic method.

通过计算说明局部搜索方法的使用能够较好地改善粒子群算法的优化性能，并且基于局部搜索的混合粒子群算法的优化性能好于遗传算法和NEH启发式方法。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。