查询词典 ethylene

A series of thermoplastic polyurethane elastomers with different fraction of hard segments based on poly (ethylene-propylene adipate)/ethylene oxide/tetrahydrofurancopolyether as soft segments were synthesized.

合成了以PET/PEPA为软段的不同硬段含量的热塑性聚氨酯弹性体，利用凝胶渗透色谱、傅立叶变换红外对其进行了表征，并测试了其力学性能。

Aims We investigated aerenchyma formation in stems of riparian plants Arundinella anomala and Salix variegate as affected by addition of ethylene and a-naphthalene acetic acid under non-flooded conditions in order to ascertain whether phytohormone ethylene and auxin are direct stimuli for aerenchyma formation in flooded plants.

为了探究乙烯和α-萘乙酸是否是水淹环境条件下植物体内通气组织形成的直接原因，对三峡库区岸生植物野古草和秋华柳在无水淹环境条件下施加乙烯利和α-NAA后茎中通气组织的形成情况进行了研究。

In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

The air was first passed through an ethylene glycole bubbler to remove HTO, then, over a heated catalyst for oxidizing HT gas to HTO which was collected in second ethylene glycol bubbler.

空气先通过一个乙二醇鼓泡吸收器以除去HTO，再通过加热的催化剂，使HT气体氧化为HTO，然后被第二个乙二醇鼓泡吸收器捕集。

The results show that top ethylene contains only 1％ butene, and bottom liquid phase contains less than 1％ ethylene.

结果表明，塔顶乙烯中只含小于1％的1-丁烯；塔底液相中乙烯含量也小于1％。

And has very high thermal and hydrothermal stability. When it is used to prepare catalyst, under catalytic cracking condition, the output rates of ethylene and from ethylene to butylene can reach more than 18% and more than 50% respectively.

该分子筛的结构和活性中心具有很高的热和水热稳定性，它的最显著的特点是，用其制成的催化剂在催化热裂解条件下，乙烯产率可达18％以上，乙烯～丁烯产率可达50％以上。

It has been more than a centaury since the identification of ethylene as a gaseous plant hormone, and the effects of ethylene on plants have enabled broad applications in agriculture.

植物激素乙烯早在一百多年前就已经被确认，相关的研究使得乙烯广泛地被应用于农业上。

We investigated the congeries morphology of sulfonated poly (styrene-b-ethylene/butylenes-b-ethylene) and its polymer colloid morphology that in solution, it is theory significance for us to understand the form mechanism of polymer colloid.

以此为基体树脂，研究其聚集态形貌，以及这些离子化聚合物在溶液中所形成的聚合物胶束形貌，对于认识聚合物胶束的形成机制具有理论意义。

This paper measures the changes of PH as the change of quantities of ethylene diamine and the addition of base in copper-ethylene diamine system.

当配合物的配体是弱酸时，配合物的生成会改变溶液的PH值，通过测量溶液PH值的改变可以计算配体的平

Gold Scorpionates Capture Ethylene ― Transition metal-ethylene complexes, known for nearly 200 years, were first made famous by Zeise's salt, K[PtCl3(C2H4)] H2O, a once-mysterious complex in which an ethylene molecule binds side-on to the platinum atom.

金蝎合物俘获乙烯――人们早在1827就制备了过渡金属烯烃复合物，最近因蔡斯盐，K[PtCl3(C2H4)] H2O，一种烯烃分子缠绕铂原子曾经很神奇的复合物，而首次名满天下。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。