选择性的

The effects of various reaction conditions were studied by GC analysis. Reaction time has slight effect on the conversion of acenaphthene. The selectivity of N-phenyl aminoacenaphthene increases with reaction time. Biacenaphthenyls or N-phenyl aminoacenaphthene is in the majority, 77.6% or 90.2% when the molar ratio of AlCl3 to acenaphthene is 1.2 and 2.4 respectively.

GC考察了不同反应条件对苊转化率和产物选择性的影响，时间对苊转化率影响不大，N-苯基氨基苊的选择性随着时间增加而增大；随着AlCl3用量的增加，苊转化率和N-苯基氨基苊的选择性随之增加；AlCl3与苊的摩尔比为1.2和2.4时，产物中联苊和N-苯基氨基苊的选择性分别达到77.6%和90.2%。

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

We studied effects of additives in the allylic amination reaction. We found that4NF could improve the reactivity and enantioselectivity.

对于烯丙基胺化反应，我们研究了外加添加剂对对映选择性的影响，我们发现四丁基氟化铵的加入可以大大提高反应速度及对映选择性。

Over the AlPO〓, the deamination and dealkylation of diethylmine and triethylmine produced ethylene selectivily. Over AlPONs of acid-base bifunctional catalysts the ethylnitrol formed selectivily.

二乙胺、三乙胺在酸性的磷酸铝上选择性的脱烷基/脱氨生成乙烯，在酸碱两性的氮化磷酸铝上选择性脱烷基/脱氢生成乙腈。

On the contrary, the selective strengthening of copper phase can not contribute to the dielectric strength.

因此，要提高CuCr合金在真空间隙中的耐电压强度，必须对其进行选择性的相强化，即选择性地提高Cr相的耐电压强度。

The selectivity of light isoparaffin was improved obviously, but with the increase of the olefin's selectivity.

在合成产物中，短链异构烷烃的选择性被显著提高，同时也伴随烯烃产物选择性的提升。

It has been demonstrated that TAK-147 is more potent and brain-specific AChE inhibition than tacrine and physostigmine, and has been approval potentiating choline acetyltransferase activity in cultured rat septal neurons more potent than donepezil, tacrine and revastigmine.

TAK－147 ｛ 3－［l一（phenylmethyl（－4－piperidinyl］－l一门，3，4，5－tetrahydro－IH－l－be.azepln－8－yi（－l－propanone umarate ｝是日本最近研制的一个选择性胆碱酯酶抑制剂。TAK－147与毒扁豆碱和他克林相比是具有更强作用和中枢选择性的胆碱酯酶抑制剂。

SiO〓 crystal transformation was improved by adding Na〓SO〓, alpha cristobalite but not tridymite was catalytic active support. C〓 selectivity was improved by adding W and P, and suppressed deep oxidation property of SiO〓. W-O in catalyst surface was not active species. The support combined with S, W, P show low activity and high C〓 selectivity.

Na〓SO〓的加入促进了SiO〓晶型的转化，α-方石英是催化活性载体成分，而鳞石英没有甲烷氧化偶联反应活性。W和P的加入改善了C〓烃的选择性，抑制了SiO〓的深度氧化特性；W-O物种不是催化活性物种；由S、W、P及SiO〓组成的载体反应活性较差，但选择性较好；同时S元素对C〓烃的选择性的贡献有限。

The solvent selectivity was divided into two parts: the partial combinatory solvent selectivity and the residue solvent selectivity.

通过研究发现，在大多数情况下部分组合选择性的作用一般比较小，在选择溶剂时，可以主要考虑部分剩余选择性。

Many hydrolyses are metalloenzymes, which lead to substrate selectivity, reaction selectivity and stereoselectivity.

酶是一种重要的生命物质，水解酶大多是有基质选择性，反应选择性和立体选择性的金属酶。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。