查询词典 copper

Reaction of L-tyrosine with benzyl bromide in the presence of copper sulfate led to the protection of phenol group on the side chain of L-tyrosine to give H-Tyr-OH in 45% yield via a copper complex intermediate.

酪氨酸与溴化苄在硫酸铜存在下反应，选择性地在其侧链酚羟基上引入苄基保护基，通过反应条件的优化，反应产率达到45%。

Brief description is given to the test on the technology for comprehensively recovering gold and silver from tellurium-bearing slag: Tellurium-bearing slag is ground and leached with water to produce crud tellurium dioxide which is then purified through ion precipitation and complexing purification process; leaching reside is leached with chloride to produce copper and bismuth, bismuth oxychloride is recovered through neutralization and hydrolysis and sponge copper is recovered through cementation; gold and silver in the remaining residue can be recycled to the gold and silver smelting system for recovery.

文摘：简述了碲渣综合回收金银等的工艺试验：碲渣经磨矿水浸碲产出粗二氧化碲，用离子沉淀和络合净化法提纯；浸碲渣用氯盐浸出铜铋，中和水解回收氯氧铋，置换回收海绵铜；残留渣中的金银可返回金银冶炼系统回收。

With a high accuracy, the biuret in compound fertilizer is determined from the color reaction between biuret and copper by copper double salt spectrophotometry, meanwhile the remove of PO43-,Ca2+, Mg2+and NH3 interferences is described without other and new interfering matters.

利用缩二脲铜的色泽反应，采用铜复盐分光光度法测定复合肥中的缩二脲，并介绍除去PO43-，Ca2+，Mg2+，NH3干扰的方法，并且在此过程中不能引入新的干扰物质。该方法精密度较好。

In order to improve the conductivity and abrasive resistance of copper-graphite composite brush ,influence of carbon fiber content on the electrical wear behaviors of the copper-graphite brush were investigated under two conditions of electrifying and non-electrifying.

为进一步改善铜-石墨复合材料电刷的导电和耐磨性，提高其使用寿命，研究了在不通电和通电2种条件下，碳纤维含量对铜-石墨电刷磨损量的影响。

In order to improve the conductivity and abrasive resistance of copper-graphite composite brush,influence of carbon fiber content on the electrical wear behaviors of the copper-graphite brush were investigated under two conditions of electrifying and non-electrifying.

结果表明，在试验条件下，在合金接触线-黄铜粉末冶金滑块系统的电磨损过程中，Cu-Cr-Zr合金接触线的电磨损率随电流强度升高显著加强，由加载较小电流引起的磨损份额为0。

Complete quality control system to ensure that the "grid to help card" stainless steel microfilament,"to help grid card" copper clad aluminum magnesium alloy wire,"to help grid card" copper clad alloy wire three series of 28 specifications of each product has reached international industry standards, and win customers.

完整的质量控制体系，确保&帮格牌&不锈钢微丝、&帮格牌&铜包铝镁合金丝、&帮格牌&铜包合金丝三大系列二十八个规格的各个产品已达到国际行业标准，并赢得用户好评。

Tian Jia Zhuang Copper Crafts Tangxian After 20 years of unremitting exploration and practice, forming a set of strict production process: 1, models, 2, making molds, 3, casting wax, 4, repair wax pattern, 5, combination, 6, lost-wax, 7, roasting, 8, casting, 9, sand, 10, Xiu Copper.

唐县田家庄铜铸工艺品历经20年不懈探索实践，形成了一套严格制作程序：1、模型，2、做模具，3、铸蜡，4、修蜡型，5、组合，6、失蜡，7、焙烧，8、铸造，9、清砂，10、修铜。

This article introduces some practical problems met in producing high-purity cathode copper , analyzes the reason of cathode copper surface particle formation by particle classification, and puts forward treatment measures and preventive measures to be taken.

介绍了高纯阴极铜生产中易遇到的实际问题，并把电铜表面粒子分成几种类型分析了其粒子形成的原因，提出了处理及应采取的预防措施。

In this paper, cuprous chloride was prepared by sulfite-reduction method with copper sulphate,which was obtained from copper-containing plating wastewater treatment.

研究了利用处理含铜电镀废水得到的硫酸铜，采用亚硫酸盐还原法制备氯化亚铜。

The mechanical strength, gluing performance and decay-resistance of 4-year-old bamboo wood treated with chitosan copper/zinc complexes, CCB (copper, chromium, boron composites), ACQ and zinc chloride were reported in this paper.

以4年生新伐毛竹为试材，以褐腐菌棉腐卧孔菌为试菌，对壳聚糖铜配合物、壳聚糖锌配合物及相应的金属盐和铜铬硼、ACQ处理材的耐腐性能、力学性能及胶接性能进行研究。

We have limited budget let me know if you can do this competitively.

我们有限的预算让我知道如果你能做到这一点竞争力。

We don't know how other critters breathe--lizards, for example.

我们还不知道诸如蜥蜴之类的动物如何呼吸。