查询词典 hexamethylenetetramine

The mechanisms of the formation of 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane in the nitrolysis of hexamethylenetetramine with nitric acid and with the mixture of nitric acid and ammonium nitrate were first studied by NMR tracing.

本文首次采用核磁共振跟踪化学反应的方法研究了在直接法和K-法中黑索金（1，3，5-三硝基-1，3，5-三氮杂环已烷，RDX）的生成反应机理。

Chloro-2-methyl-4-acetoxy-2-butene was treated with hexamethylenetetramine, followed by hydrolysis to yield 4-acetoxy-2-methyl-2-butenal, a key intermediate for vitamin A .

1-氯-2-甲基-4-乙酰氧基-2-丁烯与乌洛托品成盐后水解，得到合成维生素 A的重要中间体4-乙酰氧基-2-甲基-2-丁烯-1-醛，用微波辐射可促进水解，反应0.5h收率可达77%。

That urine and hexamethylenetetramine taking the place of sodium carbonate as the precipitants could also produce 1D Co3O4 showed lights on understanding the mechanism of formation of 1D structures.

以六次甲基四胺、尿素等代替Na2CO3溶液作为沉淀剂，均得到了一维纳米结构的Co3O4，表明CO2-3在水镁石CoO2层间的嵌入是得到一维结构水热产物的关键。

Different morphology and size of cupric oxide nanoparticles were prepared by microwave method through changing the ratio of solution′s consistency using coppersulfate anhydrous and hexamethylenetetramine as the starting materials for the first time.

首次以无水硫酸铜(CuSO4)和六次甲基四胺(CH26N4为原料，用微波法，通过改变反应物浓度比制备出粒径和形貌不同的氧化铜纳米颗粒，并用DSC、XRD、FT-IR和TEM对产物进行了表征。

Results showed that after polymerization and calcination, needle coke with big lamellar fiber was formatted by the addition of FeCl3 and paratoluenesulfonic acid as well as hexamethylenetetramine.

结果表明：向煤沥青中添加氯化铁（FeCl3）或对甲苯磺酸和六次甲基四胺后，经聚合煅烧生成大片层纤维的针状焦。

Determination of hexamethylenetetramine content.

六亚甲基四胺含量的测定。

Hexamethylenetetramine was selected as corrosion inhibitors for mild steel in pickling acid process.

碳钢(mild steel， MS)在酸洗制程中常使用含氮之抑制剂作为腐蚀抑制剂。

CeO2 nanoparticles were prepared using cerium nitrate and hexamethylenetetramine as starting materials, and the prepared powders were collocated into polishing slurry for chemical mechanical polishing of GaAs wafer.

以硝酸铈和六亚甲基四胺为原料制备出不同粒径的纳米CeO2粉体颗粒，将纳米CeO2粉体配制成抛光液并用于砷化镓晶片的化学机械抛光。

With oxalic acid and hexamethylenetetramine as the catalysts, and phenolic resin and tetraethoxysilane as the starting materials, a two-step sol-gel processing is developed for preparing Si〓N〓/SiC precursors with homogeneous microstructure composed of nanometer sized particles.

用草酸和六次甲基四胺为催化剂，酚醛树脂和正硅酸乙脂为原料，探索出了制备结构均匀而精细的Si〓N〓／SiC前驱体的溶胶—凝胶两步法。

To minimize the contamination of detrimental elements such as sulfurand chlorine, a two-step sol-gel process was successfully developed to synthesize SiC precursors with oxalic acid and hexamethylenetetramine HMTA as the catalysts, which are free of sulfur and chlorine. Tetraethoxysilane TEOS and phenolic resin were used as the silicon source and carbon source, respectively.

为了尽量减少硫、氯等有害元素的含量，本文用不含有害元素的草酸和六次甲基四胺HMTA为催化剂，正硅酸乙酯TEOS为硅源，酚醛树脂为碳源，成功探索出了制备SiC前驱体的两步法溶胶-凝胶工艺。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。