烯烃

For alkenes, vehicle related emissions and fuel evaporation are the main sources, accounting for 49% and 40%, respectively.

烯烃主要来自于交通工具尾气排放和燃料挥发，其分担率为49%和40%。

In this paper, we design a multiple-level system according to the classification of 899 alkenes from OMNIC database.

设计了一个分等级系统对OMNIC数据库中899个烯烃化合物进行分类。

The rate constants of radical and electrophilic addition to alkenes are dominated by different factors.

烯烃的自由基加成和亲电加成速率受不同的因素控制。

It provides a useful vehicle for transforming unsaturated acids to their corresponding alkenes.

它为使不饱和酸变成相应的烯烃提供了一个有用的中间体。

The 1,3-dipolar cycloaddition of nitrones with alkenes is one of the most studied reactions, among all the cycloadditions.

硝酮与烯烃的反应是环加成反应中研究最多的一种反应。

The progress in alkylation reaction of benzene with long chain alkenes was introduced from the two aspects of catalyst research and reaction technology.

从催化剂研究和反应技术两方面介绍了苯与长链烯烃烷基化反应技术的研究开发进展。

The invention relates to a work-starting method of FCC gasoline hydrodesulfurization to degrade the alkenes.

本发明涉及一种FCC汽油加氢脱硫降烯烃技术的开工方法。

In this thesis, we reported ZrCl_4 and BiCl_3 catalyzed hydroamination of alkenes and the synthesis of two titanium imido compounds.

本文报道了用ZrCl_4和BiCl_3催化的烯烃的氢胺化反应的研究和两个含钛氮双键络合物的合成，全文共分为三大部分： 1。

This catalyst system was applied in the cyclopropanation of other alkenes, and the results indicated that the catalyst system excelled mono-catalyst.

将这个催化体系用于其他烯烃的环丙烷化，结果表明，协同催化效果优于单一催化体系。

The experiments for determining the reaction kinetics of Daqing atmospheric residue were performed in a continuous flow, expanded bed rector. Four-lumped reaction kinetic model was developed to account for various feed and product fractions of Daqing atmospheric residue (gases, gas oil, residue and coke). The amounts of olefins and alkyls in the gas products were further analyzed to determine reaction kinetics of gas product distributions. Hence, a combined five-lumped reaction kinetic model was obtained for catalytic pyrolysis of Daqing atmospheric residue. The kinetic constants both in four-lump model and five-lump model were evaluated. A simulator for catalytic pyrolysis process was developed by incorporating the five-lumped kinetic model into the hydrodynamic flow model.

其次利用改进的固定流化床装置考察大庆常压渣油催化裂解反应规律，筛选反应工艺参数；分析了催化裂解工艺存在的主要化学反应类型，提出了渣油一次反应和二次反应网络图；将反应原料油作为单独集总组分，而将产品中的轻质油、气体、焦炭分别作为集总，从而建立了四集总动力学模型；在此基础上，把气体产物中的目的产物低碳烯烃独立划分，得到五集总动力学模型；采用最小二乘法分析实验数据，分别得到四集总动力学模型和五集总动力学模型中各集总间相互反应转化的反应速率常数。

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。