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In this thesis, we developed chiral proton N-O type ligands and employed them in the enantioselective addition of diethylzinc to N-diphenylphosphinoyl imines. The relationship between the structure of the ligands and the enantioselectivity was systematically studied. Furthermore, enantioselective butylation of N-diphenylphosphinoyl imines withBu〓Zn and enantioselective diphenylzinc addition to imine were also examined.

本文致力于亚胺的不对称催化有机锌试剂加成反应的研究：以手性质子型N-O配体为促进剂，对N-二苯基次膦酰亚胺进行不对称乙基锌加成反应而展开研究工作，系统地考查了手性配体的结构对反应的影响；另外，对N-二苯基次膦酰亚胺的不对称催化丁基锌加成进行了研究，并首次对亚胺的不对称苯基锌加成反应进行了初步探索。

Firstly, quantum chemical method was employed to investigate the mechanism of cationic ring-opening polymerization of tetrahydrofuran and butylene oxide.

本文首先应用量子化学方法分别探讨了四氢呋喃和环氧丁烷的阳离子开环聚合反应机理。

Accordingly, it is expected to get Organic/inorganic multilayer films that have excellent photoconductive properties. Furthermore, in order to investigate the mechanism of photoconductivity, Zinc sulphide , which is transparent in visible region, and cadmium sulphide , which has optical absorption in visible region, were employed as inorganic layers.

通过CuPc和ZnS、CdS的层状复合，期望能有效发挥各自材料的优势，并充分利用多层复合膜的界面性能等，特别是CuPc/CdS复合膜可以拓宽复合膜的响应光谱，提高复合膜光电导性能，从而制备出具有优异光电导性能，稳定性好的光电材料。

The incandescent calcium light invented by Thomas Drummond in 1816 was first employed in a theatre in 1837 and was widely used by the 1860s.

1816年杜伦孟德发明了钙光灯，1837年首次用于剧场，到19世纪60年代就被广泛采用。

The incandescent calcium light invent ed by Thomas Drummond in 1816 was first employed in a theatre in 1837 and was widely used by the 1860s.

1816年杜伦孟德发明了钙光灯，1837年首次用于剧场，到19世纪60年代就被广泛采用。

Two years of field experiment data was employed to calibrate and validate the model independently.

同时也指出了模型的一些不足和需要改进的地方。

The suggestions employed on different river segments included buffer strips, wetland creation and restoration, habitat diversity creation and near-nature engineering, separately could alleviate human disturbances and canalization effects, link broken river corridor, and improve habitat quality and biodiversity.

此外，鉴於B河段河川渠道化日益加深，导致河流廊道潜在栖地消失与河廊联系中断的情形，建议以近自然工法护岸及护堤的规划加以改善。

The semi-analytical solution for Hamilton canonical equation is employed widely in the engineering problems in recent years.

近年来，Hamilton正则方程半解析法在工程问题上的应用越来越广泛，但至今未见有关这种方法收敛性和对称性问题研究的文献。

If it seems appropriate to use the tragic style, then the illustrious vernacular must be employed, and so you will need to bind together a canzone.

如果适合于悲剧文体，那么必须使用高贵的方言，进而也需要用到歌曲。

HOW TO Variations in thermocouple and base materials, the site environment, as well as the particular style employed by the operator, keep capacitive discharge welding of thermocouple wire an art rather than a science.

怎样操作因热电偶基体材料、操作环境以及操作员采用热电偶型号的不同，电容放电焊接热电偶线，结果会有所不同。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。