查询词典 alkanes

The content of each different single oil of mixed oils could be calculated using the components concentration and diagnostic ratios of normal alkanes and terpane (m/z 191) biomakers of different single oil.

通过运用单种油样的正构烷烃浓度，萜类(m/z191)生物标志物的浓度以及它们的诊断比值作为参数，计算混合原油中的单种原油含量，其误差在允许的范围之内。

Biomarker parameters of transgressive member have specific characteristics:Pr/Ph less than 1,higher abundance of steranes,abundance of C27 are similar to C29 stertane,tricyclic terpane with feature of C21＜C23＞C24 and isotopic composition of n-alkanes enriched 12 C.

在生物标志化合物参数方面表现为Pr/Ph小于1，甾烷含量丰富，甾烷中C27化合物丰度与C29相当，三环萜烷有C21＜C23＞C24的分布特点，单体烃同位素表现出富集轻碳同位素的特点。

The second group are the mixtures of Jurassic coal-formed oils and Cretaceous-derived oils. The carbon isotope, n-alkanes and isoprenoids compositions of these oils are similar to core extracts from Jurassic coal measures. However, sterane and terpane compositions of these oils show affinity to Cretaceous source rocks. It is deduced that coal-formed oils dissolved the biomarker-rich Cretaceous bitumen of relatively low thermal maturity, and overprinting occurs during oil migration.

第二类原油具有侏罗系煤系烃源岩与白垩系湖相泥质烃源岩混源的特点，这类原油的碳同位素组成、正构烷烃分布特征和姥植比等均表现出煤成油的特征，但甾、萜烷烃类化合物组成与白垩系烃源岩接近，推测是由于侏罗系煤成油在向上运移成藏过程中，受到成熟度相对较低、生物标志物相对丰富的白垩系烃源岩的浸析作用所致。

The results of calculation will be fundmentally consistent with the experimental values.In addition, we calculated dibenzene chromium and its derivatives, ferroceneand its derivatives. The former had higher symmetry. We studied the substituenteffects by calculating their NMR spectra. The results show that: when we add asubstitute group on one ring of dibenzene chromium, the substitute group will affecttwo benzene rings. The effect is similar to the effect of branched alkanes, namely:the effect on neighbouring groups has transmissibility. Furthermore, the nearer theneighbouring group is, the stronger the effect is. This effect is observed not only onthe substituted ring, but also on the unsubstituted ring.

此外，我们重点计算了二苯铬及其衍生物和二茂铁及其衍生物的核磁共振谱，其中二苯铬及其衍生物选择的是对称性较好的体系，通过计算其核磁共振四川师范大学硕士学位论文谱，探讨其取代基效应，结果表明：在二苯铬的一个环上引入取代基后，取代基对两个苯环的影响，类似于支链院烃引入取代基后的影响：即对邻近基团的影响有传递性，并且对离得近的作用强，对离得远的作用弱，这种作用不仅体现在连有取代基的环上，也体现在没有带取代基的环上。

Comparing with marine oils in the adjacent areas, all crude oils in Hade 4 oil field (except for HD401 well) have following peculiarity: very similar in the composition of light hydrocarbon fraction, and the distribution of of phytane-series isoprenoid alkanes, high concentration in steranes, terpanes and their aromatized compounds, as well as rearranged steranes; low concentration of gammacerane, 24-norcholestanes and 24-rearranged steranes, and low C〓 regular steranes C〓/(C〓+C〓+C〓＜20%; 3-methyl steranes and 27-norcholestane predominated, respectively; very low concentration of dinosterane and 4-methyl steroid.

分析表明，与相邻地区海相原油比较，除最南端的HD401井原油外，其它井区原油均具有下述特点：轻烃馏分组成十分接近、植烷系列类异戊烯烷烃分布较为一致、甾萜类和芳香甾萜类环状化合物浓度较高、重排甾烷丰度较高、伽马蜡烷含量低、规则甾烷组成中C〓丰度低C〓/(C〓+C〓+C〓＜20％、甲基甾烷中以3-甲基甾烷为主、甲藻甾烷和4-甲基甾烷丰度极低、降胆甾烷中以27-降胆甾烷为主、24-降胆甾烷和24-重排降胆甾烷丰度低。

Alkanes can be chlorinated or brominated by treatment with chlorine or bromine in the presence of visible or uv light.

烷在可见光或紫外光照射下，用氯或溴处理才能氯化或溴化。

Short chain chlorinated paraffins, which are chlorinated derivatives of n-alkanes, are a group of complex mixtures that include 10 and 13 carbon atoms.

短链氯化石蜡是碳链长度为10至13个碳原子的正构烷烃经氯化衍生而成的复杂混合物。

The results show that the residue mainly consists of high-carbon alkanes, esters, elemental sulfurs, copper sulfides and mechanical impurities.

结果表明：残留物主要由高碳烷烃、酯类、单质硫、硫化铜和机械杂质等组成。

The results indicate that high reaction temperature and low space velocity can improve the conversion of alkanes oxidation reaction.

结果表明较高的反应温度和较低的空速有利于提高烷烃氧化反应的转化率。

The gradation in the physical properties of the alkanes is typical of a homologous series.

烷烃物理性质的逐渐变化是同系列的特点。

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。