查询词典 potassium amide

Subsequently,the microencapsulated red phosphorus has been successfully prepared by in-situ polymerization using potassium persulphate as initiator.

以过硫酸钾为催化剂，采用原位聚合法制备了微胶囊红磷。

The results showed that the low-molecular weight sodium polyacrylate from 2 000 to 4 000 were obtained when reaction temperature was 70 ℃,acrylic acid mass fraction was 20 %～30 %,the mass ratio of potassium persulphate to sodium hydrogen sulfite was 10∶1～14∶1,and reaction...

对合成的聚丙烯酸钠在陶瓷铁粉上进行应用试验，当聚丙烯酸钠加入量为0.3%~0.5%时，所得浆料粘度较小，有良好的分散效果。

For VC suspended emulsion polymerization initiated by potassium persulphate, the initial polymerization rate is proportional to 133 and proportional to RpJ0 72, where

以 KPS为引发剂进行的 VC悬浮态乳液聚合，基本上是在隔离的小水滴内进行的，类似于乳液聚合机理，但齐聚物自由基的相转移可以引发少量的单体相聚人采用优化的聚合工艺条件，得到转化率大于70％、颗粒仍由基本不熔结的初级粒子组成、吸油率为 19。

Using N,N,N',N'-tetramethylethylenediamine and potassium persulphate as a redox initiation system, high molecular weight poly was synthesized by aqueous deposited polymerization.

以N，N，N'，N'-四甲基乙二胺－过硫酸钾为氧化－还原引发体系，用水相沉淀聚合法合成了超高相对分子质量的聚醋酸乙烯。

Slaking pretreatment: distilled water and potassium persulphate solution are added and placed into a slaking hole of a COD slaking instrument, and simultaneously blank solution is taken and processed together with a sample to be detected with the same method; C.

消解预处理：加入蒸馏水和过硫酸钾溶液，置于COD消解仪的消解孔中；同时另取空白溶液，与待测样品同时以同样方法处理；C。

In the part one, we reported a novel method for the synthesis of phenacyl esters by reaction of carboxylic acids with α-bromoacetophenone promoted by potassium fluoride.

论文的起始部分系统地综述了近些年来离子液体中各类烷基化反应和各类缩合反应的研究。

Deoxybenzoin(3) was prepareded by using the resorcinol and substituted phenylacetic as starting meterials in microwave-mediated.Then the compound(3) was reacted with acetic anhydride to produce(4).The compound(4) was hydrolyzed to convert compound(5) in the acid-mediated. The compound(5) was reacted with the 1,2-dibromo-ethane and 1,3-dibromo-propane in refluxed condition with acetone as solvent to give(6) or(7),respectively.Lastly,the title compounds were synthesized by refluxing(6) or(7) with 2-methyl-benzimidazole and potassium carbonate in acetone solution.

以取代苯乙酸和间苯二酚为起始原料，用微波辐射法合成脱氧安息香(3)，(3)与乙酸酐缩合生成2-甲基-7-乙酰氧基异黄酮(4)，(4)在酸性条件下水解生成相应的异黄酮(5)，化合物(5)分别与1，2-二溴乙烷和1，3-二溴丙烷反应生成(6)和(7)，化合物(6)和(7)再分别与2-甲基苯并咪唑偶合生成目标化合物。

The positive rate was 62.5%. The allergens with higher positive rate were nickel sulfate, 4 Phenylenediamine base, fragrance mix, potassium dichromate and formaldehyde. The positive results were found in patients with face dermatitis, eczema, contact dermatitis, urticaria and pruritus.

阳性率较高的过敏原依次为：硫酸镍、对苯二胺、芳香混合物、重铬酸钾、甲醛，斑贴阳性的病种有面部皮炎、湿疹、接触性皮炎、荨麻疹、瘙痒症。

The results indicated that the content of organic matter of the natural meadow and the arbor forest land in the 0-20 cm surface soil grew separately by 36.11% and 32.96%; the nitrogen content of the natural meadow and the arbor forest land was also high, being 66.88 mg/kg and 69.37 mg/kg, respectively; the content of fast-acting potassium in the surface soil was higher than that of meadow ,while the activity of the urea enzyme, alkaline phosphatese and sucrase of the arbor forest land was stronger than that of the other four land utilization modes.

结果表明，天然草地和乔木林地10~20 cm表层土壤有机质增长率均较大，为36.11%和32.96%，二者碱解氮含量也较高，分别为66.88和69.37mg/kg；乔木林地和灌木林地0~20 cm 表层土壤有效磷含量均高于天然草地和人工草地，乔木林地速效钾含量最高。

The effect of H2SO4, phosphomolybdic acid, antimony potassium tartrate and nanogold in size of 15, 30 and 50 nm on the decreased RS intensity I was studied respectively.

在硫酸介质中，纳米金在774 nm处产生一个较强的共振散射峰；磷钼酸与酒石酸锑钾形成的三元杂多酸可被抗坏血酸还原形成锑磷钼蓝，导致774nm处共振散射峰的强度降低。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。