乙撑

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 electrode processes of catechol and p -dihydroxybenzene on Pt electrode modified with PEDOT membrane are investigated.

研究了电化学聚合制备的聚乙撑二氧噻吩膜修饰电极对对苯二酚和邻苯二酚的电催化。

Preparation of ethylene bis stearamide using stearyl chloride and ethylenediamine as raw materials has been studied.

研究了以乙二胺和硬脂酰氯为原料制备乙撑双硬脂酰胺的反应，讨论了原料配比、反应时间、反应温度的影响。

The reactions of ethylenedinitrourea with ethylenediamine or with polyether were studied.

根据乙撑二硝基脲降解生成乙撑二异氰酸酯中间体的性质，研究了它与乙二胺的反应，并进行了硝化反应研究。

Its principal use has been for surface sterilization of powders as a precaution against potential microbiological contamination of the sterile powder during aseptic handling.

乙撑氧也被用在无菌粉末的处理上，它的主要用途是对原粉表面灭菌，在无菌处理期间防止对无菌粉末可能造成的微生物污染。

Methods Technetium 99m (99mTc) ECD single photon emission computed tomography was performed in 67 newborns with HIE.

采用锝(99mTc)乙撑双半胱氨酸二乙酯单光子发射型计算机断层摄影术对67例HIE患儿进行脑血流灌注断层显像。

Wings bilobed at apex.

环亚乙基脲，乙撑脲

The density functional theory and MP2 method were employed to study the reaction pathways of methanolysis of 3-methyl cyclic ethylene phosphate: CH3O－＋MEP; CH3OH＋MEP; CH3O－＋HMEP; CH3OH＋HMEP.

采用密度泛函理论和MP2方法研究了3-甲基环状乙撑磷酸二酯与甲醇的反应途径： CH3O－＋MEP； CH3OH＋MEP； CH3O－＋HMEP； CH3OH＋HMEP。

A series of novel amphipathic macrocyclic polyamine ligands derived from iminodiacetic acid and diethylene triamine have been synthesized and characterized by MS, 1H NMR, IR spectra and elemental analysis.

以亚胺基二乙酸和二乙撑三胺为原料，通过关环等反应合成了一类侧链含有羟基的新型两亲性大环多胺。

In the second chapater, first-principles electronic structure calculations were performed to examine the reaction pathway and corresponding activation free energies for alkaline hydrolysis of representative phosphodiesters, including dimethyl phosphate, trimethylene phosphate, ethylene phosphate, and a simplified model of adenosine 3\', 5\'-phosphate.

第二章中主要应用量子化学从头计算方法研究了四种磷酸二酯—二甲基磷酸酯，乙撑磷酸酯，TMP阴离子及cAMP的模型化合物的碱性水解反应途径，并估算了各个反应的能垒和自由能能垒。

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。