查询词典 alkanes

To explore the climatic implication of compound-specific hydrogen isotope ratios of sedimentary n-alkanes, the author sampled shallow sediment cores respectively from the climatically and environmentally distinct basins Qiangyong Glacier Lake,Kongmu Co Lake,Nam Co Lake, Keluke Lake and Xiao Qaidam Lake along a S-N transect on the Tibetan Plateau for the extraction and analysis of these biomarkers.

本文分别在青藏高原南部的大枪勇错、空姆错，中部的纳木错以及东北部的克鲁克湖和小柴达木湖钻取了浅岩芯，通过对沉积物中正构烷烃的提取分析和单体氢同位素比值的测定来探讨该类生物标志物单体δD值的气候指示意义。

Thermogravimetric analysis was extended to the measurements on vapor pressures of three n-alkanes, hexadecane, heptadecane and octadecane, on the basis of the Langmuir equation for zero-order vaporization process. The vapor pressures were calculated by two different methods, a constant-parameter one and a comparative one, from the TGA data. These results are in good agreement with the reference data calculated from the Antoine equation.

根据自由蒸发过程的Langmuir关系，将热重分析用于正十六烷、正十七烷和正十八烷等3个正构烷烃的蒸气压测定，分别采用常数法和比较法计算蒸气压，其结果与文献数据符合较好。

The fatty acids and waxes of Myrica rubra kernel were analyzed through GC-MS, The results showed that the yield of kernel oil was 31.10%, and there were eight fatty acids and three long-chain alkanes in the extracted composition. The main composition were Palmitic acid 28.22%, Linoleic acid 14.4%, Oleic acid 25.74%, Erucic acid 15.68%, Heptadecane 5.2%, Octadecane 5.87%, Nonadecane 4.71%. The total content of unsaturated fatty acid was 55.91% with the Linoleic acid and Oleic acid of 40.19%, these supplied a reference to its comprehensive utilization.

用GC-MS对杨梅核脂肪酸与蜡质成分进行了分析，结果表明：杨梅中脂肪酸和蜡质的总含量为31.10%，其中含有8种脂肪酸和3种长链烷烃，主要为棕榈酸(C16：0)28.22%、亚油酸(C18：2)14.4%、顺式-油酸(C18：1)25.74%、芥酸(C22：1)15.68%，十七烷5.2%、十八烷5.87%、十九烷4.71%，不饱和脂肪酸总含量为55.91%，其中油酸、亚油酸含量为40.19%。

SM6 and SM7 of uncrystal were analyzed through GC-MS, the results showedthat SM6 main contained unsaturated fatty aldehyde with fragrance, i.e.-2,4-decadienal(58%), tetradecanoic acid (55.78%), 2-decenal(50%), Phthalic acid isobutylundecyl ester(47%), 2, 4-Decadienal(41%), 2-Undecenal (31%), 2-Methyl-Z,Z-3, 13-octadecadi-enol(18.84%), and SM7 contained saturation alkanes, i.e. 1, 2-Benzenedicarboxylic acid, butyl cyclohexyl ester(23.90%), Triacontane(22.63%),Nonacosane(21.04%), Heptadecane(18.84%), Octacosane(13.58%). Toxicological experiments were done to insure the pigment safety.

并对紫红丝膜菌色素非晶体部分的黄色油状物SM6和紫色粉末物SM7作了GC-MS分析，结果显示SM6中主要为具有香气成分的不饱和脂肪醛，其中含量较高的依次为：-2，4-癸二烯醛(58％)、十四烷酸(55.78％)、2-癸烯醛(50％)、邻苯二甲酸异丁基十一烷酯(47％)、2，4-癸二烯(41％)、2-十一碳烯醛(31％)、2-甲基-Z，Z-3，13-十八碳二烯酸(18.45％)等；SM7中主要为饱和直链烷烃，其中含量较高的依次为：1，2-苯二羧酸丁基环己酯(23.90％)、三十烷(22.63％)、二十九烷(21.04％)、十七烷(18.84％)、二十八烷(13.58％)。

In order to investigate the quantitative structure-retention relationship in gas chromatography, the molecular structure of monosubstituted alkane RX (X=halogen, OH, SH, NH2) is divided into two parts, R and X, to obtain molecular structure parameters, and the retention times in GC for 37 monosubstituted alkanes RX were determined.

将单取代烷烃RX(X=卤素，OH，SH，NH2等)分子结构分为两个区域来提取分子结构参数，从三方面影响因素(烷基R、取代基X、R与X的相互作用)来定量关联RX的气相色谱保留时间。

Recent developments of clean oxidation systems catalyzed by polyoxometalates are summarized in detail. The emphasis is on the epoxidation reaction of olefinic compounds, oxidation of alkanes and aromatic compounds with the comparatively ideal oxidants, hydrogen peroxide and molecular oxygen respectively.

文本总结了多金属氧酸盐在液相清洁催化氧化方面的进展，主要针对以过氧化氢和分子氧为氧化剂的烯烃类化合物的环氧化反应、烷烃和芳香族化合物的氧化反应，并详细探讨了此类氧化反应的反应机理。

Recent developments of clean oxidation systems catalyzed by polyoxometalates are summarized in detail. The emphasis is on the epoxidation reaction of olefinic compounds, oxidation of alkanes and aromatic compounds with the comparatively ideal oxidants, hydrogen peroxide and molecular oxygen respectively. The oxidation mechanisms are elucidated in detail.

文本总结了多金属氧酸盐在液相清洁催化氧化方面的进展，主要针对以过氧化氢和分子氧为氧化剂的烯烃类化合物的环氧化反应、烷烃和芳香族化合物的氧化反应，并详细探讨了此类氧化反应的反应机理。

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The reactions of linear alkanes on SO~4^2-/ZrO~2 solid superacid catalysts were studied.

本文考察了SO~4^2-/ZrO~2固体超强酸催化剂上正构烷烃的反应及影响催化剂活性和选择性和各种因素。

A method for analysis n-alkanes,steranes and terpane s in oil by internal standard method was established.

采用内标法建立了原油中正构烷烃、生物标志物的分析方法。

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。