机理

Based on the Amsterdan Dense Function by Computer Molecular Simulation, the theoretical investigations of reactions between CpTiCl〓 and AlMe〓, or different cocatalytic site models of MAO allowed us to reach some significant insights into the mechanisms involved in the formation of active species responsible for ethylene polymerization.

本文采用分子模拟技术，以阿姆斯特丹密度泛函理论为基础，首次对CpTiCl〓和A1Me〓或MAO中不同助催化点的模型进行量化计算，研究了半茂体系催化乙烯聚合过程中涉及活性中心形成的反应机理。

A detail procedure for extracting aloin from fresh aloe leaves was developed by using an obturated microwave-assisted extraction device with a pressure controlling unit.

应用密闭微波萃取装置对芦荟中的有效成分芦荟甙进行了微波萃取研究，并利用透射电子显微镜对微波萃取机理进行了初步探讨。

By analyzing the molar fraction of St and MAh in the copolymers obtained from 〓C spectra, the copolymers obtained are proved to be strictly alternating structure, and sequence information obtained from DEPT experiments also verifies the copolymers with MSM sequence.

通过分析〓C NMR得到共聚物中St和MAh摩尔含量，证明共聚物具有严格交替结构，从DEPT实验中得到的结构信息表明共聚物只含有MSM序列。并且探讨了可控聚合反应的机理。

It is believed that it is a promising alternative for thermionic cathode and field emission cathode. Since 90s 20th century, many important progresses in ferroelectrics cathode have been made. With the researches on the theory and experiments of this field, many new ferroelectrics devices will come into being and will have important usages in high-tech domain.

自20世纪90年代以来，铁电阴极材料及应用研究取得了许多意义重大的研究进展，随着电子发射机理研究的进一步深入，以及新铁电阴极材料制备技术和电子发射技术的进一步发展，完全可以期望在不久的将来就会有各种新型铁电电子发射器件在不同的高新技术领域发挥重要的作用。

In order to explore the regulatory mechanism of high voltage electric field on ripening and senescence of postharvest fruit, effects of steady electric field or alternative electric field treatment on metabolism of active oxygen species in harvested tomato fruits were studied.

为探讨高压电场调控采后果实成熟衰老的作用机理，研究了交变电场和稳恒电场处理对采后番茄活性氧代谢的影响。

Modification mechanism of alumina and the latest development in this field are reviewed.

综述了氧化铝改性机理及近年来国内外这一领域的发展。

Decomposition of supersaturated sodium aluminate solution is one of the most important procedures in the production of alumina.

过饱和铝酸钠溶液分解是氧化铝生产过机理的研究是氧化铝生产过程的重要基础问题。

A systematical summary is made of the advances in research on decomposition mechanism of solution aluminate seeds.

系统总结了铝酸钠溶液种分过程的溶液结构及分解机理的研究进展。

A systematical summary is made of the advance in research on decomposition mechanism of solution aluminate seeds lately.

系统总结了近年来铝酸钠溶液晶种分解过程分解机理的研究进展，并详细地介绍了强化铝酸钠溶液晶种分解的不同方法。

The paper researches the mechanism of anion surfac tant in sodium aluminate solution decomposition process.

目的研究铝酸钠溶液晶种分解过程中阴离子表面活性剂的作用机理。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。