查询词典 chemical method

This paper reviews the basic physical and chemical property of nitrogen trifluoride ,including its production method.

介绍了三氟化氮(NF3)的基本物化性质及生产方法。

Preparation method and chemical composition of water-solubility polysaccharide in corn silk were studied in this paper.

对玉米须中水溶性多糖的制备方法和化学组成进行了研究。

The chemical composition research aspect literature report are extremely few: According to reports, the root of Rosa davurica pall includes the lactone, the tanning substance, the return to original state sugar, the total lucoside, the flavanone, the phenol class, the biological alkalis, the protein, the anthraquinone equi com ponent, moreover ,the total polysaccharide is the even polysaccharide which is composed by the fructose.In 1999, for the first time from puncture the root in the alcohol extraction to sep arate Oleanic acid. And used the double wave length thin layer scanning method to determine the uneven pillar tartaric acid in to puncture in the root ontent.

化学成分研究方面文献报道极少：据报道，山刺玫根中含有内酯、鞣质、还原糖、总苷、黄酮、酚类、生物碱类、蛋白质、蒽醌等成分，而且山刺玫根中总多糖是由果糖组成的均多糖。1999年，首次从刺玫根的乙醇提取物中分离出齐墩果酸，并采用双波长薄层扫描法测定了齐墩果酸在刺玫根中的含量。

Chlorine ion ; chemical oxygen demand ; low concentration ; potassium dichromate method

氯离子；化学需氧量；低浓度；重铬酸钾法

The model of principal components is built up by applying a method of principal component analysis and by extracting the principal character of process variable to condense process data of multi-variables in a process of chemical polymeric production.

对聚合生产过程中的操作变量进行主元分析，提取过程变量的主要特徵，建立主元模型，可实现对多变量过程数据的压缩。

It is an efficient way to improve the properties of proton exchange membranes by the method of chemical cross-linking.

化学交联是提高质子交换膜性能的一种有效方法。

To project of this one innovation, taiyuan manage is versed in university president Xie Kechang thinks, the extractive distill method that this suit buy uses and photograph of traditional vitriolic and purificatory craft are compared, without eduction of waste liquid of acerbity broken bits, technological process is simple, investment cost is low, and can reclaim the acridine thiophene that uses high additional cost, it is an environment friendly model project of green chemical industry.

对于这一创新项目，太原理工大学校长谢克昌认为，该套装置采用的萃取蒸馏法与传统的硫酸精制工艺相比，无酸渣废液排出，工艺流程简单，投资成本低，且能回收利用高附加值的医药原料噻吩，是环境友好型绿色化工工程。

The invention relates to a method of preparing desulfurization gypsum dry powder painting putty by using desulfurization gypsum as raw material, which belongs to chemical construction material and solid castoff comprehensive utilization field.

本发明涉及一种以脱硫石膏为主要原料制备脱硫石膏干粉批墙腻子的方法，属化学建筑材料和固体废弃物综合利用技术领域。

We studied the chemical pressure effect in Y123 using 〓Cu nuclear quadrupole resonance experimental method.

这种载流子分布的变化不能解释化学压强对超导转变的抑制。

A new method to accurately and quantitatively study the chemical durability of glass was put forward.

提出了一种精确定量地研究玻璃化学稳定性的新方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。