查询词典 alkanes

The absolute average deviation between calculated values and experimental data was 0.0044 for 51 alkanes.

对51个烷烃计算值与实验值的平均偏差仅为0.0044。

The selective oxidation of propane to acrolein is an important reaction for the utilization of light alkanes.

丙烷选择氧化制丙烯醛是低碳烷烃优化利用的一个重要反应。

A new prediction method for octane number of acyclic alkanes is proposed.

提出了一种采用基团组成和拓扑指数分别描述分子的化学组成和结构信息，进而预测烷烃辛烷值的方法。

In order to find the difference of the isotopic composition of different organic compounds before and after complexation, the autogamy standard sample is performed by molecular sieve adsorption to study the variation of the isotope compositions of n-alkanes, isoalkanes and cyclanes.

通过对自配标准样品进行S分子筛吸附试验，测定了用5分子筛吸附法分离前后正构烷烃、异构烷烃和环烷烃碳同位素值，探讨试验前后碳同位素值的变化。

A novel method was proposed for the direct determination of biomarkers,such as n-alkanes,terpanes and steranes in crude oil by GC/MS coupling with backflush cutting technique and micro-fluidic splitter.

研究了一种反吹切割微流控装置气质联用技术直接分析原油中的正构烷烃类、萜烷类、甾烷类生物标志物的新分析方法。

Geometric parameters such as bond length, bond angle and molecular volume were carefully investigated, as most of the acyclic alkanes under study are not yet synthesized.

研究还测定了它们的几何参数，如键长，键角，分子体积等，它们中的绝大多数分子目前还没有被合成。

In the mixed system of culture media, because of the effect of catabolite repression and synergistic mechanism between products, the degradation of succinonitrile is promoted while the degradation of alkanes is inhibited.

在培养基混合体系中，由于分解阻遏效应和降解产物的协同效应，有利于丁二腈的降解而对烷烃降解不利。

A catalyst carrier was designed and synthesized under a new concept. After carrying a precious metal, a new generation of catalysts was obtained. This catalyst can convert straight chain alkanes to isomerized alkanes effectively.

采用新概念设计并合成出催化剂载体，担载贵金属后获得新一代催化剂，该催化剂可在低压条件下，高效率地把直链烷烃转化为异构烷烃。

Nine wethers selected from a group at 2-years-old of age were fed with fresh mixtures of Leymus chinensis (30%), Cleistogenes squarrosa (20%) and Artemisia frigida (50%) in known proportions and amounts for 14 days. Artificial QSM capsules were dosed during the experiment. The samples of herbage and feces were collected daily for 7 days and dried for analysing the n-alkane concentration by a gas chromatography. The results showed that there was a difference in concentration of n-alkanes among 3 species forages, and fecal recoveries of n-alkanes linear increased with increasing carbon chain lengths.

于2004年秋季在中国科学院内蒙古草原生态系统定位研究站用不同放牧演替阶段的优势植物羊草、糙隐子草和冷蒿按一定比例混合组成日粮，饲喂9只2岁羯羊，每只羊投喂一粒QSM胶囊，试验期内每天记录绵羊实际牧草采食量、采食成分和排粪量，利用气相色谱分析牧草和粪样的链烷含量，应用链烷技术测定绵羊的排粪量、不同牧草采食比例和总干物质采食量，并与实际值进行比较。

Similar δD values of n-alkanes in samples in different maturity stages indicate that effect of thermal maturity on δD values of n-alkanes is not significant during the stages from immaturity to maturity, therefore, it can be used as a useful auxiliary tool for oil/source correlation.

生物标志化合物和正构烷烃的碳氢同位素组成特征表明，在未成熟－成熟阶段正构烷烃的单体氢同位素组成受热成熟度的影响不明显，可以作为油源对比的一个有用的辅助指标。

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。