金属

It is demonstrated that the chiral quaternary ammonium salts catalysts exhibit promising catalytic properties for the substrate. Part III: The synthesis and the characterizing of the macroporous aminomethyl resin-supported cinchona alkaloid complexes and the study on its catalytic properties The part consists of two subsections. the macroporous aminomethyl resin -supported cinchona alkaloid complexes were synthesized by the stuff (cinchonine, quinine and macroporous aminomethyl resin). Their structures were characterized by means of elemental analysis, XPS, TG/DTA; the chiral polymer-supported complexes were first used as catalysts for the reduction of ketones. Their catalytic properties for the reduction processes were investigated. The comparison of the products e.e., the conversion of the substrate among different reduction processes was employed with determined by HPLC. The effects of the time, the temperature, the ratio of catalyst to substrate, reaction solvent as well as the recycle times were also discussed.

第三章聚-4-氨甲基苯乙烯负载金鸡纳碱金属络合物的合成与表征及其不对称催化性能研究本章分为两节，以辛可宁和奎宁及聚-4-氨甲基苯乙烯为原料，合成了4种聚-4-氨甲基苯乙烯负载金鸡纳碱络合物催化剂，并对它们的结构用元素分析、X-射线光电子能谱、TG/DTA等几种测试手段进行了表征；首次将所合成的手性高分子负载的金属络合物用于催化芳香酮不对称还原反应，详细研究了所得的手性高分子负载的金属络合物对不同底物的催化性能，用HPLC等分析手段定量检测了还原过程的底物转化率及其产物对映异构体选择性，并考察了反应时间、反应温度、催化剂和底物投料比、反应溶剂和循环次数对催化性能的影响。

The radial vibration of a piezoelectric ceramic thin ring and a metal thin circular ring are analyzed and their electro-mechanical equivalent circuits are obtained.

该换能器由一个厚度方向极化的压电陶瓷薄圆环及一个金属圆环组成。对压电陶瓷圆环和金属圆环的径向振动分别进行了分析，得到了各自机电等效电路。

The results show that quartz cannot react with oleic irons at pH=8-10, because it is difficult to combine with metallic irons. On the contrary, clinochlore can adsorb with oleic ions because there are enough active metallic positive ions between the minerals layers which can combine with clinochlore. The clinochlore can be hydrophobic, and so the separation can be realized finally. At pH=9, the clinochlore removal rate is the maximum, the purity of SiO2 is 99.86%, and the recovery of SiO2 is 35%.

结果表明：在pH为8~10的碱性溶液中，粉石英难与金属阳离子缔合，所以，不与油酸根离子结合；而斜绿泥石解离后层间存在活性金属阳离子，可与油酸根离子发生化学吸附产生疏水作用，因而使用反浮选的方法能有效地实现二者的分离：当pH为9时，斜绿泥石的去除率最高，粉石英的纯度达99.86%，回收率为35%。

More than half the elements are metals in which close-packed arrays of atoms are held together by delocalized electrons.

半数以上的元素是金属，在金属中原子依靠离位的电子紧密结合在一起。

But all the related investigations are concentrate on Body-Centered Cubic and Face Centered Cubic metals, hexagonal close-packed metals have not been involved yet.

但目前的研究主要集中在体心立方和面心立方结构的金属，而密排六方结构的金属尚没有涉及。

We study dynamics of the hydrogen atom near a metal surface using the closed orbit theory, and discuss its changes of properties with the varying of the distance d between the atom and metal surface.

采用闭合轨道理论研究了近金属表面里德堡氢原子的动力学性质，讨论了氢原子电子的运动性质随原子与金属表面距离d变化的情况。

We want to buy Coating, Used Metal Printing, Metal Printing Coater Printing Machinery

我们要采购涂料，二手的金属印刷，以金属复盖印刷，外面复盖印刷机器

The fundamental principles of oblique evaporation of nanometals and the columnar structure of metal evaporated video tape are presented.

阐述了纳米金属斜蒸镀的基本原理，给出了纳米金属蒸镀录像带磁层的柱状结构。

The metal nanocrystals memories come into notice as so many advantages. The advantages of metal nanocrystals over their semiconductor counterparts include low power consumption, higher density of states, smaller energy perturbation due to carrier confinement, stronger coupling with the channel, better size scalability, and the design freedom of engineering the work functions to optimize device characteristics.

然而金属的量子点记忆体在近年来受到瞩目，其相对於传统半导体材料用於量子点记忆体上，有诸多的优势，其优势包含低功率耗损、高密度的能阶、没有明显的量子局限效应、有效降低元件尺度、且可调变的空间大，因为随不同的金属有不同的功函数。

And the complex of hydroxyquino line and metal iron is a small molecule luminous material which has very high luminescence efficiency.

而喹啉和金属离子螯合所形成的有机金属螯合物则是一种应用广泛的有机小分子发光材料。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷