查询词典 alkali reaction

Meanwhile, the dosages of etherification agent and alkali influencing on degree of substitution and reaction efficiency are discussed.

同时讨论了醚化剂用量和碱的用量对取代度和反应效率的影响，确定了合成阳离子淀粉反应的最佳碱催化剂用量为 1%。

Kalium and natrium erode into brick at a high temperature in the form of simple substance and result in expansion in self-baking carbon brick, and molten alkali metal oxides adsorbed on the face of brick react with SiO2 and obtain a eutectic mixture which causes expansion at a high temperature, while carbon deposition caused by the reaction of CO and simple substance of kalium and natrium as well as the soot deposition of CO contribute to the lower temperature expansion.

结果表明：膨胀率及碱含量都随温度和时间的增加而增加，膨胀率受时间影响较大，达到8%左右，而受温度影响较小，仅为1%左右；砖内K， Na元素质量分数受时间和温度的影响均较大，分别达到4.5%，5.33%，4.28%，4.46%，且Na侵蚀较K严重；在高温下K， Na是以单质形式侵入砖体内，而熔融碱是吸附在砖体表面并与SiO2：生成低共熔化合物引起高温膨胀，在低温下砖内K，Na单质与CO发生C沉积以及CO发生烟碳沉积反应引起低温膨胀。

Ionization energy 3.894 electron volts. It is in the most lively alkali, oxygen and can generate multiple vigorous reaction, a mixture of oxide.

在碱金属中它是最活泼的，能和氧发生剧烈反应，生成多种氧化物的混合物。

An indirect spectrophotometric method was used to determine the content of lactide. The factors on the determination, such as the type of solvent, acid and alkali dosage, the time of aminolysis reaction and so on, were discussed.

采用间接光度法测定粗丙交酯中丙交酯的含量，讨论了溶剂类型、胺解反应时间、酸碱用量等因素对测定结果的影响。

At the same time, the importance of donor atoms pertaining to the side chain in the complexation reaction of three lariat azacrown ethers with alkali metal ions has been analyzed through the Fukui function.

同时，利用福井函数，对侧臂在氮基臂式冠醚与碱金属配位过程中的重要性进行了分析，结果表明氮基臂式冠醚的侧臂上供电子原子对整个冠醚分子与金属配位过程中有着十分重要的作用。

The basic structural motive of alkali lignin is similar with phenol, containing phenol-carbonyl, alcohol-carbonyl, metonym and other active groups, and it can set off a reaction of carbonyl modification.

碱木素基本结构单元分子类似于苯酚，含有酚羟基，醇羟基，甲氧基等活性基团，可以发生羟甲基化等改性反应。

A process for preparing the olefine sulfide includes addition reaction between sulfur monochloride and C3-C12 olefine under existance of low-carbon alcohol as catalyst to obtain addition compound, mixing it with C1-C15 haloalkane, sulfide of alkali metal, sulfur powder, and aqueous solution of emtrol, sulfurizing, dechlorinating, and refining.

一种硫化烯烃的制备方法，包括：(1)使一氯化硫和C 3 ～C 12 烯烃在低碳醇催化剂的存在下进行加合反应，生成加合物；(2)将(1)步的加合物与C 1 ～C 15 卤代烷、碱金属硫化物、硫磺粉、脂肪醇水溶液混合，进行硫化脱氯反应后，精制处理，得到硫化烯烃产品。

As a representative alkaline aggregate, nepheline was selected and the effect of it on the expansion of alkali-silica reaction was studied.

以霞石正长岩为代表，研究了含碱集料对碱-硅酸反应膨胀的影响。

In the second part (chapter 5) results of the K-promoted oxidation of GaAs (110) surface by photoemission are reported, the status and reaction of oxygen, the influence of alkali-metal coverage and oxygen exposure on adsorption kinetics are discussed.

第二部分是利用光电子能谱研究了K／GaAs（110）表面的催化氧化过程。目的是研究不同碱金属覆盖度对氧气在表面的吸附动力学的影响，不同氧气暴露量下氧的状态及氧化过程中涉及到的反应。

Because admixture can primely restrain alkali aggregate reaction, flyash should be added to concrete.

掺合料对抑制碱骨料反应具有很好的作用，所以在混凝土中掺加粉煤灰。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。