查询词典 quaternary

Some basic geological problems related to establish the Surficial Crust Section, such as the division of geomorphologic type and Quaternary time-genesis series, were also studied in detail.

一些与建立地壳表层断面有关的基础地质问题，如区内地貌类型的划分、第四纪堆积物时代-成因系列的建立等，也在文中做了详细的研究。

Syntheses of Grignard precursor, N - tert -butyl-4-chloro-piperidine, were accomplished via transamination with a quaternary ammonium piperidone or via addition of methylmagnesium chloride to an iminium ion.

氏体合成， N-叔丁基-4-氯哌啶、出自同一个经转氨酶哌季铵盐或透过增设methylmagnesium亚胺离子的氯化物。

It was found that tribromide quaternary ammonium salt was an excellent bromide reagent, which was easy to handle and had low toxicity. The reaction can process rapidly and has high bromide rate.

研究结果表明，三溴季铵盐是一种性能优良的固体溴化剂，操作方便，对人体的危害性小，反应速度快，溴化率高。

Tribromide quaternary ammonium salt capability research

三溴季铵盐；性能；研究

A isotherm of a monolayer at air-water interface for a quaternary ammonium salt type trimeric surfactant (shortly called 12-2-12-2-12) was investigated by the Langmuir balance technology. The surface tension at collapse pressure,γ, and the molecular limited area, A, were determined and compared with the surface tension of the surfactant solution at CMC concentration,γ.

利用Langmuir膜天平研究了季铵盐三聚表面活性剂12-2-12-2-12在空气－水界面单分子膜的表面压－分子面积等温线，得到它的崩溃压对应的表面张力γ(下标 collapse)和分子极限面积A。

A quaternary surfactant, N,N-dimethyl-N-dodecylaminopropyltrimethoxy ammonium chloride was synthesized from γ-chloropropyl trimethoxy silane by quaterisation with N,N-dimethyldodecylamine.

利用γ-氯丙基三甲氧基硅烷与 N ， N-二甲基十二烷基胺反应，合成了 N ， N-二甲基-N-十二烷基氨丙基三甲氧基硅烷氯化铵。

The optimum conditions of preparing quaternary ammonium salt of chitosan were determined as follows: the molar ratio of chitosan to glycidyl trimethyl ammonium chloride 1:3, reaction temperature 80℃and reaction time 10 h.

制备壳聚糖季铵盐的最佳反应条件为：壳(来源：A4040BC论文网www.abclunwen.com)聚糖与环氧丙基三甲基氯化铵的摩尔比为1：3、反应温度是80℃、反应时间为10小时。

A monomer, trithiocarbonate anion is successfully"immobilized"onto the polymeric support by reaction of CS〓 with strong-base quaternary ammonium in anion exchange resin with OH〓 form.

研究了把CS〓离子固定到阴离子交换树脂上，以及它在CS〓悬浮体系中和另一单体，α，α'-二溴代二羧酸甲酯在阴离子树脂表面上进行的亲核取代反应。

1Insti tute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; 2State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xi'an 710075, China

中国科学院地球环境研究所，西安 710075 2 中国科学院黄土与第四纪地质国家重点实验室，西安 710075 3 中国科学院研究生院，北京 100039

Undoped ZnO and LixMg0.2Zn0.8-xO quaternary alloy thin films were prepared on the ordinary glass by sol-gel method.

采用Sol-gel法在普通载玻片上制备了纯ZnO薄膜和LixMg0.2Zn0.8-xO四元合金薄膜。

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。