查询词典 copper bit

Moreover,the selective oxidation of primary and secondary alcohols to corresponding carbonyl compounds with the multinuclear copper complexes Cul-Cu4 as catalysts have been conducted using TBHP and O_2/TEMPO,respectively.Among them,the copper complex Cu3 showed the best performance.On the performances of the two classes of oxidants,benzylic and heterocyclic alcohols could be effectively oxidized to carbonyl compounds.Specifically,the secondary alcohols could be effectively oxidized to ketones with excellent selectivity up to 100%in the presence of TBHP and the allylic alcohols could be effectively oxidized to aldehydes in the presence of O_2/TEMPO system.

实验结果还表明，在TBHP或O_2/TEMPO存在下，各配合物催化剂均能使各种取代芳香伯/仲醇以及杂环醇等以不同程度的转化率和选择性转化成相应的醛或酮，其中，配合物Cu3在O_2/TEMPO存在下可使苯甲醇和烯丙醇等以较高转化率和近100%的选择性转化成相应的醛，而对其它芳香醇和脂肪伯/仲醇等的催化性能则较差；在TBHP存在下，配合物Cu3则可使1-苯乙醇和其它仲醇以较高转化率和近100%的选择性转化为相应的酮，但对各类其它伯醇选择氧化的性能相对较差。

A decatalytic spectrophotometric based on a copper catalyzed redox reaction between potassium peroxydisulfate and bromcresol purple has been developed for the determination of trace copper in the percent of sulfuric acid.

在酸性介质中，以K2S2O8为氧化剂，溴甲酚紫为指示物质，Cu强烈阻抑K2S2O8氧化溴甲酚紫褪色反应，褪色反应程度在一定范围内随Cu浓度增大而降低。

The high arsenic content cassiterite copper sulphide ore in Kafang is a kind of copper-tin polymetallic intergrowth sulphide ore.

卡房高砷锡石硫化铜矿属于铜锡共生多金属硫化矿，根据选矿的一般原理，这种硫化矿物的主要选别方法是浮选，其中的锡石由于比重较大常采用重选进行回收利用。

In this paper,based on the development of automatic packaging production line of cathodal copper control system,for accurate measurement of copper weight in online in the project,studied the real-time communication between the industrial control computer and METTLER TOLEDO electronic balance,and through VB Control designed communication procedures to achieve data communications and data collection.

通过阴极铜自动包装生产线控制系统的研制，针对该项目中在线精确计量铜垛重量，研究了工业控制计算机与梅特勒-托利多电子秤之间的实时通信，并通过VB控件利用两种方法设计了通信程序，实现了数据通信和数据采集。

However, the quality of the copper film deposited by this method is poor. In order to resolve this problem, we study the influence of some additives on two different kinds of electroless copper plating which using sodium hypophosphite as reducing agent and sodium citrate as chelating agent, sodium citrate and ethylene diamine tetraacetic acid disodium salt (EDTA·2Na). Electrochemical methods were used to test the anodic and cathodal polarization processes which can explain the mechanism of the influence of additives.

然而该体系所得的铜膜质量较差，为此我们研究了以次磷酸钠为还原剂，分别以柠檬酸钠为单一络合剂，柠檬酸钠和乙二胺四乙酸二钠为双络合剂体系中，研究了几种添加剂对化学镀铜的影响，并通过电化学方法研究了各种添加剂对化学镀铜沉积电位的影响。

"The beginning of the period is sometimes called the Chalcolithic (Copper-Stone) Age, referring to the initial use of pure copper (along with its predecessor, stone)."

青铜时代伊始阶段，有时称作石器－青铜时代，以表示纯铜金属的开始用于工具制造。

BC. The beginning of the period is sometimes called the Chalcolithic (Copper-Stone) Age, referring to the initial use of pure copper (along with its predecessor, stone).

青铜时代伊始阶段，有时称作石器－青铜时代，以表示纯铜金属的开始用于工具制造。

The results of FTIR and QCM measurement showed that Schiff bases could chemisorb on the copper surface through coordination, indicating that it is feasible to prepare SAMs of Schiff bases on the copper surface.

QCM和FTIR结果表明，希夫碱分子通过其中的亚胺基与铜的配位作用在铜表面发生化学吸附，从而形成自组装膜。因此用自组装技术在铜表面上制备希夫碱自组装膜是可行的。

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。

He's a pretty westernised kind of guy.

他是一个非常西化的人。

National spirit is the moral kingpin for a nation to realize common ideal and goal.

一、中华民族精神的基本内涵党的十六大报告指出：在五千多年的发展中，中华民族形成了以爱国主义为核心的团结统一、爱好和平、勤劳勇敢、自强不息的伟大民族精神。