查询词典 olefin

Polyfluoroalkyl iodides could react with unsaturated olefin acids in the presence of sodium dithionite by radical addition to give adducts. It was found that these adducts could form polyfluoroalkyl substituted γ or δ-lactones due to intramolecular nucleophilic substitution in the alkali solution.

研究发现：多氟烷基碘化物在连二亚硫酸钠存在下与不饱和烯酸经自由基加成得到的产物，能在碱性条件下进行分子内亲核取代反应形成五元或六元环的含氟内酯类化合物。

"Olefin Any unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double Bond."

烯烃：含有一对或多对由双键连接的碳原子的一类不饱和烃。

"Olefin Any unsaturated hydro carbon containing one or more pairs of carbon atoms linked by a double bond."

烯烃：含有一对或多对由双键连接的碳原子的一类不饱和烃。

For the insulation with electroscope metal lever and crust, suppress of pink of sees useful glass, porcelain, bakelite is tasted, olefin, of useful even and common rubber and cork.

以验电器金属杆和外壳的绝缘来说，所见到的就有用玻璃、瓷、胶木粉压制品、石蜡，甚至有用普通橡皮及软木塞的。

The relationship between olefin content in gasoline and exhaust emission of gasoline engine is discussed.

讨论了汽油中的烯烃与发动机排放之间的关系。

The study of homogeneous olefin polymerization catalysts has been one of the most active research a...

均相烯烃聚合催化剂的研究是十多年来最活跃的研究领域之一。

The prepared supported palladium catalyst with ultra thin fiber morphology can hydrogenate olefin and nitrobenzene hydrogenation in high efficiency. The loss of noble metal was reduced and the quality of the product was improved for formation of chemical bond between metal and polymer.

本论文以电纺丝技术为基础，利用聚丙烯腈、苯乙烯-丙烯腈共聚物、聚乙烯基吡咯烷酮和壳聚糖衍生物等为载体，制备出了负载钯的超细纤维无纺布形态催化剂，并对其催化加氢性能进行了讨论研究。

Results Hypoxanthine was administered via stomach, while unease inhibitor was injected subcutaneously by lanolin mixed with olefin, which made the uric acid in serum higher than control group about 12 hours.

结果 采用灌胃给予次黄嘌呤，皮下注射以羊毛脂石蜡油为溶剂配制的尿酸酶抑制剂，可使受试动物血尿酸值明显高于空白对照组(P.01)，且可维持12h。

The process can convert over 95% isobutylene in C 4 olefin into diisobutylene or isooctene in the present of acid cation exchange resin catalyst,and partial 1-butylene also take part in the reaction.

介绍了一种混合碳四烯烃叠合利用的预反和催化蒸馏组合技术，该技术以酸性阳离子交换树脂为催化剂，可以将混合碳四烯烃中的95%以上的异丁烯叠合反应生成二异丁烯和异辛烯，且部分正丁烯也参与二聚或共聚。

Olefin metathesis opens up new industrial processes for the production of important olefins in the field of petrochemicals.

烯烃交叉复分解反应作为石油化工领域一种重要过程，为各种单烯烃间的互相转化提供了一条有效的途径。

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。