查询词典 olefins

Generally the catalysts have high activity and good selectivity. At present the coupling reactions of organoborahes with terminal olefins s acid chlorides and aryl halides play an important synthetic approaches in organoborane chemical. The catalysts can be used by many kinds of organometal compounds such as: irons cobalt nickel ruthenium rhodium palladiums titaniums zirconiums tins indium and lithium organic compounds; The achievement has been amazed in preparing of unsaturated or saturated compounds and in synthesizing of natural products bioactive molecules and chiral compounds.

目前，卤代烃与不饱和烃的偶联反应和有机硼试剂与酰卤和卤代烃的偶联反应已成为有机合成的研究热点，此类反应可用铁、钴、镍、钌、铑、钛、锆、锡、铟、锂等多种有机金属化合物来催化，用于形成含饱和或不饱和C-C键的化合物，并已在天然产物、液晶、具有生理活性物质和手性化合物的合成中应用。

Prepare for and participate in training courses about olefins unit.

准备并参加各装置的培训课程。

This catalyst is designed to ensure the reduction of the olefins in gasoline.

为一种可降低汽油烯烃含量的催化剂。

With the increase of Ce content, light olefins selectivity increases too.

随铈含量的增加，催化剂的烯烃选择性有所增加。

In order to meet the environmental protection demand of automobile exhaust emission.the olefins in gasoline has to be controlled.

为满足日趋苛刻的汽车尾气环保要求，汽油烯烃含量也必须严格控制。

The recyclable catalytic systems are able to be applied to a wide range of olefins.

该催化体系优于目前国内外相关研究报道的催化体系。

The process formation of branched PE and the formation ofα-olefins were studied.

并且本文研制的α-二亚胺镍催化剂在聚合1h后仍保持较高的催化活性。

Olefins are important materials for modern petrochemical and fine chemical industry, anda large amount of products.

烯烃是现代石油化工、精细化工的重要原料，需求量很大。

With the increase of Mn content, light olefins selectivity increases and catalytic activity decreases.

随锰含量的增加，催化剂的烯烃选择性有所增加，但催化活性下降。

MTOis the most hopeful technology that substitute for the way of petroleum to olefins.

作为MTO反应的核心，催化剂的合成成为人们研究的重点。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。