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- Form UV diffuse reflectance spectra, it seems that carbonyl and phenolic groups mainly contribute to the light induced yellowing of poplar APMP. 紫外漫射反射光谱表明 ,杨木APMP机械浆光诱导返色的主要原因是纸浆木质素中羰基和酚羟基团吸收紫外光后变化形成发色结构所致。
- Donors such as amine and phenolic groups,when positioned ortho to a nitro group,are always involved in intramolecular hydrogen bonding. 在硝基邻位上存在的氢键给体如胺基,酚基时,总与硝基形成分子内氢键。
- Like the amino group, the phenolic group powerfully activates aromatic rings toward electrophilie substitution, and in essentially the same way. 对于亲电取代反应，酚基基本上以同氨基一样的方式使芳环强烈活化。
- Codeine has the same structure as morphine, but the phenol group is masked as a methyl ether. 可待因也有和吗啡相同的结构，但是酚基被甲基醚屏蔽了，结果。
- The apparent reaction order of phenolic group with epichlorohydrin and end epoxide group in oligomer are all second order.The rate constants and activation energy were determined. 实验证明酚基与环氧氯丙烷反应的表观反应级数为二级，与链末端环氧基的反应也为二级。
- Result:In the entire anaesthesia surgery process different third phenol group blood stream dynamics compares graciousness fluorine alkane group to be steady. 结果:整个麻醉手术过程中异丙酚组血流动力学较恩氟烷组平稳。
- If the content of hindered phenol group in antioxident is higher and its thermal stability is better,then the anti-thermo-oxidative ability forthe polyglycol is stronger. 具有高阻碍酚基团含量且耐热的抗氧剂，对聚乙二醇的热氧化保护能力最强。
- Gallic acid was firstly acetylized with acetic anhydride to protect phenolic groups, then reacted with SOCl_2 or PCl_5 to prepare intermediate tricetyl-galloylchloride, in which the yields were 80% and 90% respectively. 将没食子酸先用醋酐进行乙酰化保护酚羟基,后与酰氯化剂SOCl2或PCl5反应,制得三乙酰基没食子酰氯,得率分别为80%25和90%25;
- Keywords calix[8]arene;phenolic group modified;alkylating; 杯[8]芳烃;酚羟基改性;烷基化;
- Do you teach your students singly or in groups? 你教学生是个别地教还是按组教？
- The investigator will be divided into three groups. 所有的调查员将被分为三个小组。
- Rioting broke out between rival groups of fans. 双方球迷之间发生了骚乱。
- The party split up into two groups. 这个党分成了两派。
- The pupils are streamed into four ability groups. 这些学生按智力划分成四个小组。
- We divided the students into four groups. 我们把学生分成四个组。
- The teacher divided our class into four groups. 老师把我们班分成四个小组。
- The act or process of uniting into groups. 编组编成小组的行为或过程
- Anhua County Phenolic Moulding Powder Pl. 安化县电木粉厂。
- The class is chopped up into small groups for oral drill. 为进行口语训练，班级分成为几个小组。
- A phenolic resin was blended with PBT. 研究了加入聚对苯二甲酸丁二醇酯(PBT)对酚醛塑料的增韧改性。
