查询词典 benzene

Second,2-methyl-1-phenyl-1-pentanone was synthesized with benzene and isocaproyl chloride in the presence of anhydrous aluminum chloride as a catalyst .

其次，以无水三氯化铝为催化剂，苯与2-甲基戊酰氯反应合成了2-甲基-1-苯基-1-戊酮

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

Introduced the market demand of anhydride of domestic and international benzene and price case and development trend.

介绍了国内外苯酐的市场需求和价格情况以及发展趋势。

In this paper a tube wall reactor has been studied for the catalytic oxidation of benzene to maleic anhydride.

以苯催化氧化制顺酐的反应为研究对象，对管壁式催化反应器进行了研究。

The introduction of amino-group into benzene ring to produce aniline is involved in this research.

直接将氨基引入苯环合成苯胺属于这类研究的课题。

Polypropylene centrifuge tubes can not be with concentrated nitric acid (95%), aqua regia, toluene, benzene, gasoline, kerosene, ether, etc. from accessing.

聚丙烯离心管不能与浓硝酸（95％）、王水、甲苯、苯、汽油、煤油、乙醚等接触使用。

" Benzene (1825) Simplest aromatic hydrocarbon, parent substance of a large class of chemical compounds."

苯(1825)：最简单的芳香烃，是一大类化合物的母体。

Aromatic A hydrocarbon derived from,or characterized by the presence of the benzene ring

芳烃 由苯环衍生出的、或因含有苯环而具有其特性的烃化物。

Aromatic A hydrocarbon derived from,or characterized by thepresence of the benzene ring

芳烃 由苯环衍生出的、或因含有苯环而具有其特性的烃化物。

In the case of the single-ring aromatics, benzene homologues could be identified in the first place.

在这个单环芳烃的例子中，苯同系物可以被第一位被检验出来。

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。