查询词典 benzene

Thereinto nano-SnO2 powder is admixed with surface negative ion active solvent dodecyl benzene sulfonic acid sodium salt to reach the purpose of surface modifying.

采用化学沉淀法制备的纳米SnO2粉体，通过表面包覆阴离子活性剂十二烷基苯磺酸钠来达到表面修饰的目的。

It was found that the conversion of benzene increased remarkably with the admixing of the dealuminated Y zeolite with Pt/Al2O3 catalyst, even if the zeolite itself was inactive.

在连续常压固定床反应器上考察了Pt/Al2O3分别和惰性石英砂、脱铝Y沸石、WO3/Al2O3等组成的机械混合物上苯加氢反应的性能。

Ethylene adsorbs more strongly than benzene and ethylbe...

乙烯与乙苯的反应较丙烯与异丙苯的反应难于进行。

Up to now, it is still a controversial question that whether benzene could be biodegraded under denitrifying condition.

反硝化条件下的生物降解具有还原条件要求低、污染物去除效率高、经济可行等优点，更是研究的热点。

Benzene was biodegraded rapidly after a short lag time.

本研究中反硝化条件下苯生物降解的一个显著特点是滞后期短，降解速率快，电子受体的消耗量小。

The carbonizing temperature, carbonizing time and the pressure of benzene (C6H6) are the decisive factors.

结果表明：在1723K，苯的压强为1.5×10-2Pa，碳化6min后Mo-La2O3阴极碳化度达到19.7%，碳化层为疏松多孔的Mo2C组织，有利于阴极热电子发射。

DMBA was resolved in benzene, where in the central portion of a cotton yarn was immersed in it. The DMBA-coated yarn was inserted into the cervixes of mice. The animals sacrificed after 5 months were observed.

棉线浸入溶于苯的二甲基苯蒽中，于小鼠宫颈部位埋入含有DMBA的棉线，连续观察5个月，通过光镜观察宫颈组织病理形态。

The coking and deactivation process of benzene and ethylene alkylation reaction over AB-97 zeolite has been studied systematically. The results of acceleration deactivation reaction indicate that deactivation process go through three phases, high level activity stability period, activity decline period and low level activity stability period. The mechanism of this phenomenon was analyzed by the way of the experiment research of pore structure and acid quality of coked zeolite. It is concluded that reducing the strong acid active centers and crystal outer-surface active centers are benefit to improve the activity stability of zeolite.

在AB-97型分子筛催化剂上对苯/乙烯烷基化制乙苯反应体系的结焦失活历程系统实验研究，催速失活实验结果表明失活历程经历高水平活性稳定期，活性衰退期和低水平活性稳定期三个阶段，并通过对失活催化剂的孔结构及酸性质的实验研究，对这一现象进行了机理分析，认为催化剂改性研究中采用降低强酸活性位和晶粒表面活性位这两种手段都有利于改善催化剂的活性稳定性。

The main intermediates were detected during decomposition,such as acetic acid,oxalic acid,malonic acid,phenol,3-hydroxyhypnone,naphthalene,benzene sulfonic acid,phthalic acid,β-naphthalene etc . by ultraviolet-visiblespectroscopy,ion chromatographand gas chromatograph coupled with mass spectrophotometertechniques.The possible degradation pathway of Acid Orange Ⅱ was also speculated,that was,hydroxyl radical reacted with the azo linkage-bearing carbon of naphthol-ring,and the C—N cleaved,the azo-dye decolored and mineralized.

运用紫外光谱、离子色谱、色谱-质谱联用等方法，测定出酸性橙Ⅱ的主要降解产物有乙酸、乙二酸、丙二酸、苯酚、3-羟基苯乙酮、萘、苯磺酸、邻苯二甲酸、β-萘酚等，并依此推测酸性橙Ⅱ的降解机理，即羟基自由基攻击酸性橙Ⅱ分子上与萘环相连的C—N键，导致C—N键的断裂，进而染料脱色矿化。

Although benzene is often represented with alternating single and double bonds between carbon atoms, the electrons in the bonds are shared or delocalized in such a way as to make all carbon-carbon bonds alike .

虽然往往把苯描绘成碳原子之间按单、双键交替排列，但事实上键中的电子是共享的，或者说是非定域的，其结果是使所有的碳原子都是等同的。

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。