查询词典 oxalic acid

Thus, the method can only be used to the cyclization of N~4-aryl-4,5,6-triaminopyrimidine with oxalic acid.

在合成各类化合物的过程中，共得到未见文献报道的新型中间体50多个，并根据其结构特征，用相应的光谱对其结构进行确证。

Fluorite is not cleaned very well by oxalic acid and seems to be etched by it.

萤石是没有清理得很好，由草酸并似乎已被镌刻在所左右。

The synthesis of diethyl oxalate and oxalic acid by catalytic coupling reaction of carbon monoxide in gaseous phase at normal pressure is one of important projects of C〓 chemical technology.

CO常压、气固相催化偶联合成草酸和草酸酯等是目前碳一化学研究的重要课题之一。

The preparation method of oxalic acid from grain sorghum straw with hydrolysis_oxidation_hydrolysis method was investigated.

研究了以高粱秆为原料用水解氧化水解法制取草酸的工艺方法。

The presence of oxalic acid played an important role in the morphology of hematite formed.

少量草酸的存在对於所形成胶体粒子的形态起着重要作用。

The catalytic activities of some coordination polymers in synthesis of DPC from oxidative carbonylation of phenol were investigated. Palladium complex Pd(C_2O_4)·0.5(C_4H_8N_2) has better catalytic activity in the typical reaction condition, it was synthesized with PdCl_2, oxalic acid and piperazine hexahydrate by solvothermal method under low temperature and characterized by IR, EA and TG.

以一些配位聚合物作为主催化剂考察它们在苯酚氧化羰基化生成碳酸二苯酯反应中的催化活性，经过比较，筛选出配位聚合物Pd(C_2O_4)·0.5(C_4H_8N_2)(在低温条件下以溶剂热法合成)，采用IR、TG，EA和比表面分析技术对它进行了表征。

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。

The influence of different concentration of oxalic acid on elemental inductively coupled plasma mass spectrometry has been investigated.

研究了不同浓度下乙二酸对元素电感耦合等离子体质谱行为的影响。

The influence of different concentration of oxalic acid matrix on elemental inductively coupled plasma mass spectrometry was investigated.

研究了不同浓度乙二酸介质对元素电感耦合等离子体质谱行为的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。