查询词典 chromium

In the third part of this paper, a facile method is presented for synthesis of malonaldehyde dianil from propargyl alcohol by oxidizing using chromium trioxide and addition reaction with aniline.

对肼基苯磺酸是由对氨基苯磺酸经亚硝酸钠重氮化得到的重氮盐用亚硫酸氢钠还原、水解、硫酸酸化制得，本文经多次实验确定了反应原料、用量及反应条件，得到的产品纯度好，产率高。

A facile method is presented for synthesis of malonaldehyde dianil from propargyl alcohol by oxidizing using chromium trioxide and addition reaction with aniline.

以丙炔醇为原料，经三氧化铬氧化生成丙炔醛后，直接与苯胺反应简便地合成了β-苯胺基丙烯醛缩苯胺。

Ruixing is the registered trademark of our company, and the major products include Pyromellitic Dianhydride, Pyromellitic Acid, mesitylene, Durene, Aluminum Chloride Anhydrous, fluoro paints, melamine, green chrome oxide and metal chromium.

公司产品注册商标为&瑞星&牌，主导产品为：均苯四甲酸二酐、均苯四甲酸、均三甲苯、均四甲苯、无水三氯化铝、氟碳涂料、三聚氰胺、氧化铬绿和金属铬。

In a large environment hygrogram, electriferous envirogluvtm on chromium have affinity.

7在湿度不小的境况下，带电的油不朱差铬有潮和性。

X-ray photoelectron spectroscopy was used to investigate the content and chemical valence of chromium element,and the content of compounds in chromate passive film formed on commercial tinplate via a cathodic electrolytical treatment.

用X射线光电子能谱(X-ray photoelectron spectroscopy，XPS)分析的方法，对铬酸盐钝化镀锡钢板的正常表面及缺陷点处铬元素的含量、价态以及由铬元素组成的化合物进行了研究。

Elinvar is a trademark for a kind of nickel-chromium steel used for watch springs because its elasticity is constant over a wide range of temperatures.

埃林瓦是一种用于手表弹簧的镍铬钢，因其能在很大的温度范围内保持一定的弹性。

Cylinder body endophragm and the live pump plunger shaft plate the hard chromium, has the very good abrasion resistance; Between all glide part has the oil-free lubrication axis and the guidance link reduces the friction coefficient, the extension service life, AW the air operated actuator U curved characteristic

输出扭矩大，动作灵活平稳；缸体内壁和活塞轴镀硬铬，具有很好的抗磨性；所有滑动部件之间配有无油润滑轴和导向环以降低摩擦系数，延长使用寿命，AW气动执行器的U型曲线特性输出扭矩更适用于大口径球阀、蝶阀。

Some soil chemical properties, as pH of soils, cation exchange capacity, calcium carbonate, ferriferous oxide and organic matter are studied. Chromium speciation is mainly affected by soil pH, CEC and calcium carbonate, but little by ferriferous oxide and organic matter.

所研究的土壤化学性质中，土壤pH值、阳离子交换量以及碳酸盐量对土壤铬形态分布及生物有效性影响较大，铁氧化物与有机质含量对土壤铬形态的分布及生物有效性有一定的影响。

The characteristics of the strains towards chromium, nickel, cadmium, copper and ferrum adsorption have been studied comprehensively.Based on these conditions the research of the wastewater treatments such as galvanization, hardware industry, leather production, and printing and dyeing using the strains has been carried out.

通过系统的研究，构建了10株以解脂假丝酵母和产朊假丝酵母为出发菌的基因工程菌株；对菌株处理重金属铬、镍、镉、铜和铁等重金属的性能进行了较全面的分析。

ABSTRACT Color center and chromium－doped forsterite lasers were studied theoretically and experimentally in the dissertation.

本文主要对色心及掺铬镁橄榄石激光器的理论和实验进行了研究。

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。