查询词典 alkanes

The selective oxidation of isobutane to methacrylic acid is one of the most complex processes in partial oxidation of alkanes.

异丁烷选择氧化制甲基丙烯酸是烷烃选择氧化工艺中反应历程较复杂的过程之一。

The concentrations of isopentane, 2-methyl-pentane, pentane and 3-methyl-pentane which are from automobile exhaust and gasoline evaporation were highest in alkanes. Benzene/toluene ratio was close to 0.5 which is the characteristic value of automobile exhaust. The concentrations of pinene and isoprene were highest in alkenes.

烷烃类物质中异戊烷、2-甲基戊烷、正戊烷和3-甲基戊烷等机动车尾气或汽油挥发特征性物质浓度最高；芳香烃类物质中苯／甲苯的特征比值略高于机动车尾气排放特征比值0.5；烯烃类物质以植物排放的蒎烯、异戊二烯为主。

On the basis of the characteristics of atomic types in molecule,Hall's electrotopological state indices and Kier's molecule shape index(~mK are calculated for 117 alkanes,cyclanes, aliphatic alcohol ,aliphatic ketones.

这些拓扑指数被用于关联117种烷烃及其衍生物的色谱保留指数，经逐步回归与偏最小二乘法，建立了烷烃、环烷烃、脂肪醇及酮的R.I。与En、mK的4个最佳方程。

By multiple regression analysis, a reasonable model was developed for predicting the refractive index of alkanes.

通过多元回归的方法建立了X与折光指数的定量结构性质相关模型。

A review is presented on carbon dioxide as oxidant in alkanes catalytic conversion in the last 30 years.

本文综述了近年来国内外有关利用二氧化碳作为氧化剂在烷烃催化转化反应中的研究状况。

The studies indicate that the structure-property relationship of alkanes can be well reflected by the group distance parameter and connectivity indexX.

研究工作表明基团距离参数和连接性指数在一起使用可以更好地反映出烷烃的构效关系。

Such as pentane there are three isomers, Wang alkyl has 35, while containing 30 carbon atoms, the number of isomers of alkanes up to 411 × 109 Ge.

例如戊烷的异构体有3个，王烷有35个，而含30个碳原子的烷烃的异构体数目高达411×109个。

The characteristics of normal alkanes and the ratio of pristane to phytane are related to the sedimentary environments.

烃源岩和原油有机地球化学成分中的正烷烃特征与沉积环境类型有密切关系。

On the basis of the gas chromatographic analysis of n-alkane fingerprint, the method achieved good reliability with selecting seme characteristic alkanes (i.e.n-C17, n-C18, n-C20, pristane and phytane) as the criteria of identifying. The whole procedure was simple and facile while expending short time.

该鉴别方法基于样品的正构烷烃气相色谱指纹分析，选择既能表征油种固有特性，又受风化影响较小的正十七烷n-C_(17、正十八烷n-C_(18、姥鲛烷、植烷和正二十烷n-C_(20等特征烷烃作为判据，可信度大，而且整个操作流程短，较简便易行。

Cytochrome P450 BM-3 (CYP102) from Bacillus megaterium catalyzes the subterminal hydroxylation of long-chain fatty acids (C12 to C20) at the positions ω-1,ω-2,ω-3 and the epoxidation of unsaturated fatty acids. Artificial mutants of P450 BM-3 also hydroxylate substrates like short-chain fatty acids (C8 to C10), alkanes, cycloalkanes, heteroarenes and polycyclic aromatic hydrocarbons, which offers potential applications in the pharmaceutical industry, environmental measurement and bioremediation and chemical industry.

细胞色素P450BM-3来源于Bacillus megaterium，能催化长链脂肪酸C_(12-C_(20)的次末端(ω-1，ω-2，ω-3)羟化及不饱和脂肪酸的环氧化，其突变体催化的底物拓展到中链的脂肪酸C_8-C_(10、烷烃、环烷烃、杂环烃、多环芳烃等，因此在医药工业、环境检测和修复及化学工业具有广阔的前景。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。