机理

The results showed that alkylation of benzene with ethanol occurred via stepwisemechanism.

结果表明，苯与乙醇的烷基化按照分步机理进行，速控步骤的活化能为170.34 kJ/mol。

The mechanisms of the ruthenium-catalyzed reaction of organic azide with terminal alkyne have been investigated using density functional theory.

采用密度泛函理论，对在Ru催化剂存在下，有机叠氮化合物和末端炔的反应机理作了深入理论研究。

The crystal-chemical properties and the genesis of the allanite have been disscussed, in addition, the radioative decay of Th and U and the oxidation cause rare-earth elements to be released from its lattice to d...

认为本区的褐帘石是部分变生的。变生的机理是因为其晶格中含放射性元素U，Th高，且这与褐帘石的选矿性能有重要关系。

Resistant accessions, genetic basis, biochemical research and molecular marker are summarized in this article. We also discussed how to apply allelism test which using hybridize and molecular marker in different resistance materials in order to make a good use of resistant resources and provide useful information in the further research of the multiresistant mungbean breeding.

本文就绿豆抗豆象基因资源的发掘与利用及抗豆象特性的遗传机理与分离规律进行了总结与分析，对抗豆象的生化基础研究和分子标记进行了综述，探讨了抗豆象育种的重要性及尚需解决的问题，提出进行不同抗源的基因等位性鉴定、高效地利用抗源、培育多价抗豆象绿豆品种的重要性。

To solve supporting problem of freezing shaft wall in very deep alluvium, the stress mechanism and method of design optimizing are discussed.

为解决特厚冲积层冻结井筒的支护难题，对井壁受力机理和设计优化方法进行了探讨。

The isomerization reaction of propylene oxide to produce allyl alcohol catalyzed by basic lithium phosphate was studied.

研究了环氧丙烷在碱性磷酸锂催化作用下异构化生成烯丙醇反应过程，考察催化剂的制备条件，异构化温度对催化性能的影响，以及催化反应机理和动力学特性。

This paper reviews the recent advances in synthesis of chiral allylic amines, mainly discussing the effects of ligands on chemo-and regio-selectivities.

综述了近年来手性烯丙基胺的合成进展，重点介绍了催化剂配体对化学选择性和对映选择性的影响，并阐述了各种类型的反应机理

There were few successful examples of regioselectivity in reactions of unsymmetrically allylic derivatives, and enantioselectivities obtained with prochiral nucleophiles.

因而我们选用反应机理相对比较清楚的钯催化烯丙基取代反应来研究平面手性的作用。

The technology of separating rutile and almandine by flotation and the action mechanism of sodium hexametaphosphate[(NaPO3)6], a regulator, were investigated for realizing an effective separation of rutile and almandine, a main gangue mineral, in non-pollution.

为了实现金红石与主要脉石矿物石榴石在无污染条件下的有效分离，采用浮选方法研究了金红石和石榴石的分离，并采用红外光谱和X光电子能谱分析等手段研究了分离过程中调整剂六偏磷酸钠的作用机理。

The action mechanism that (NaPO3)6 depresses almandine is two sides: one is that (NaPO3)6 is chemical adsorbed firmly on the surface of almandine and lead to almandine strong hydrophilic. The other is that (NaPO3)6 selectively dissolves Ca(superscript 2+) on almandine surface and makes the surface cations act with the collector lessening.

NaPO36对石榴石的抑制作用存在两种机理：其一，(NaPO3)6与石榴石表面Fe(上标 2+)发生化学键合导致其牢固吸附而使石榴石表面强烈亲水：其二，(NaPO3)6选择性溶解石榴石表面Ca(上标 2+)导致石榴石与捕收剂作用的表面活性质点减少。

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％。