查询词典 copper

Since Dong Han Dynasty, Dongchuan has provided coinmaking materials for each dynasty and reached its peak in Qing Dynasty when it was called "Jing Copper" and "Yun Copper".

东川自古就有&天南铜都&之美誉，东汉以后为历代王朝提供铸币原料，到清代盛极一时，称为&京铜&、&云铜&。

Nutrition solution culture, ICP-AES, the differential centrifugation technique and sequential chemical extraction method, suppression subtractive hybridization , RAPD were used in this thesis to study the mechanisms of copper tolerance and accumulation by Commelina communis grown in copper mine deposit which was reported to be a Cu hyperaccumulator, compared with C.

论文以本实验室报道的生长于矿山上的铜超富集植物鸭跖草和生长于正常土壤中的鸭跖草为试验材料，分别运用溶液培养法、ICP-AES元素测定技术、差速离心法和化学试剂逐步提取法、抑制消减杂交技术、RAPD技术研究了矿山和非矿山两种生境鸭跖草对铜的耐性和吸收积累的差异，两种生境鸭跖草在铜胁迫下养分吸收和积累的差异，两种生境鸭跖草在铜胁迫下生理反应的差异，以及铜在鸭跖草细胞内的分布及结合形态研究，矿山鸭跖草差异表达的cDNA克隆，铜对鸭跖草种群遗传分化的影响，从这几个方面探讨了矿山鸭跖草对铜的耐性机理。

Cyclohexyl acetate was synthesized by oil of vitriol,ferric chloride and copper sulfate,respectively,and the influence of copper sulfate containing water and no-water for the reaction was discussed.

摘 要：分别以浓硫酸、氯化铁、硫酸铜为催化剂催化合成醋酸环己酯，考察了有无结晶水的硫酸铜对酯化反应的影响。

Concentrations of free copper and mucus and other parameters including pH and alkalinity of the gill microenvironment of Cyprinus carpio exposed to copper of various levels were determined using Playle's apparatus.

利用 Playle设计的装置测定了不同铜暴露水平下鲤鱼鳃部进出水中的游离铜离子浓度、粘液含量及有关参数。用MINTEQA2和单配位体模型联合的试算方法计算了不同形态铜含量以及鳃部粘液对铜的络合能力。

The experiment confirms that the Al2O3/Cu composite material by internal oxidation of deeply aluminized pure copper matrix is a kind of superiority diathermanous copper material as being the metallurgical equipment material.

将纯铜深层渗铝内氧化A12O3/Cu复合材料的性能与纯铜深层渗铝固溶时效合金的性能进行对比，确定纯铜深层渗铝内氧化A12O3/Cu复合材料作为冶金设备用传热铜材料的性能的优越性。

The influences of additives [K4Fe6, 2, 2'-dipyridyl and L-argiine] on the depositing rate and stability of electroless copper bath and the corrosion resistance, conduction and adhesion of copper plating were investigated using electrochemical methods etc.

用电化学等方法，研究了添加剂亚铁氰化钾、2，2'-联吡啶和L-精氨酸对陶瓷化学镀铜镀液的沉积速度与稳定性、镀层的耐腐蚀性、导电性及结合力的影响。

On the other hand, a method for the synthesis of-vinyl chalcogenides by the coupling of vinyl bromides with thiols or diphenyl diselenide using copper salts as catalysts in ionic liquids based on amino acids also has been described. The ionic liquids play multiple roles in the reaction: they act as solvent, base, and excellent promoter for the copper-catalyzed coupling reactions.

在新型的氨基酸负离子的离子液体中，开发了一个亚铜盐催化的Z-型溴代烯烃与硫族元素的交叉偶联反应，为立体选择性的制备Z-型烯基硫醚或烯基硒醚类化合物提供了一个新的方法；在此反应体系中，离子液体不仅起到了反应溶剂的作用，而且还起到了金属催化剂的配体和中和反应副产物的碱的作用。

Said film made electrode has good charge discharge circulation reversibility, wherein: copper diselenide film made electrode specific capacity keeping on 220 mah/g; copper selenide film made electrode specific capacity keeping on 160 mah/g; cuprous selenide film made electrode specific capacity keeping on 210 mah/g more or less.

由这三种薄膜制成的电极，都具有良好的充放电循环可逆性，其中：由二硒化铜薄膜制成的电极的比容量保持在220mAh/g左右；由硒化铜薄膜制成的电极的比容量保持在160mAh/g左右；由硒化亚铜薄膜制成的电极的比容量保持在210mAh/g左右。

Studying the positive plate quality,electrolyte composition,additive and manufacturing operation how to effect electrolytical copper quality in production process and finding the method to improve electrolytical copper quality.

研究了电解铜生产过程中阳极板质量、电解液成分、添加剂和生产操作等因素对电解铜质量的影响，并针对上述影响因素，提出了进一步提高电解铜质量的办法。

Erodent properties : ACQ-DB preservative and its treated materials may cause erosion to some materials, Such as copper, aluminum and zinc-copper alloy etc.

腐蚀性： ACQ-DB 及 ACQ-DB 处理材对铜、铝、锌-铝合金等材料有一定的腐蚀作用，所以避免与上述材料直接接触。

This matter overthrew all basises I learned from Sunday school .

这件事把我从周日学校学到的所有道理都颠覆了。

It's one of the cruel ironies of aging: if you want to remember your favorite restaurants, the less you should eat at them.

这是一个老化的残酷讽刺：如果你想记住你最喜欢的餐馆，你应该更少吃到它们。