查询词典 pre reduction

In this paper the calculating formula of sea water oxi dazing reduction potential is derived and the transformation of oxidation reduction of heavy metal in sea water is analyzed .

本文导出海水氧化还原电位计算公式，定性分析了重金属在海水中氧化还原转化。

The results show that the reduction of free height of steel 44Si2CrV spring under compressive stress 900 MPa consists of two parts: plastic deformation of surface decarburized zone to hinder elastically deformed internal material recovering, making up 84% of total reduction of free height and creep of steel at ambient temperature makin...

结果表明，44Si2CrV钢弹簧在900 MPa的应力下压缩72 h，自由高度的缩短由两部分组成：表面脱碳层的塑性变形，造成对内部材料的牵制而使部分弹性变形不能恢复，由此所造成的弹簧自由高度缩短占总变形量的84％；钢的室温蠕变，占自由高度缩短的16％。

The tantalum powder s by sodium reduction was heat-treated at 1350 ℃,1400 ℃ and 1450 ℃ respectively,then the three kinds of powders were deoxidized by Mg reduction at the same condition.

用钠还原氟钽酸钾得到的原粉分别在1350，1400，1450℃温度下进行热处理，得到的3种钽粉按照相同的条件进行镁还原脱氧处理，测试钽粉的化学成分、物理性能和电性能。

Comparison on structure of different specific volume of tantalum powder ;2. The tantalum powder s by sodium reduction was heat-treated at 1350 ℃,1400 ℃ and 1450 ℃ respectively,then the three kinds of powders were deoxidized by Mg reduction at the same condition.

用钠还原氟钽酸钾得到的原粉分别在1350，1400，1450℃温度下进行热处理，得到的3种钽粉按照相同的条件进行镁还原脱氧处理，测试钽粉的化学成分、物理性能和电性能。

In order to radically improve the present silicothermic reduction process for magnesium smelting, this paper started with the idea of taking liquid calcium as reductant and studied the feasibility of the new magnesium reduction process deoxidizing by liquid calcium .

为了从根本上改进现行的硅热法炼镁工艺，从新的还原剂——液态钙着手，研究了用液态钙为还原剂的金属镁还原新工艺的可行性。

By comparing direct and indirect ways of electrolyzing, conclusions have been gotten that the percent reduction of indirect way is higher than that of direct way, but there will be plentiful flocculent precipitates in the indirect reduction.

郑州大学硕士学位论文通过对直接与间接电解两种方法的比较发现，间接电解法比直接电解法还原效率高，但间接电解还原中会出现大量的絮状沉淀。

Based on the research and development of synthesis of halogenated pyridines the paper chose the electrochemical reduction as a research direction, and to 3,4,5,6–tetrachloropicolinic acid, pentachloropyridine, 3,4,5,6-tetrachloro-2-trichloromethylpyridine for raw materials, the reduction behavior on silver and carbon -containing silver electrode was mainly studied.

全卤吡啶脱氯是卤代吡啶类化合物合成的新尝试，本文在国内外卤代吡啶合成研究的基础上，选择了以电化学还原作为研究方向，以3，4，5，6-四氯吡啶甲酸、五氯吡啶、3，4，5，6-四氯-2-三氯甲基吡啶为原料，主要研究了其在银和碳载银电极上的还原行为。

The test results show that the pneumatic milling process not only can solve the milling technology with big particle size of UO 2 powder and environment contamination during milling operation, but also can reduce the time of ADU reduction, and the UO 2 powder after reduction by kilning and without stabilizing and sieving can be directly introduced into milling device for pneumatic milling.

研究结果表明：采用该技术，不仅能够较好地解决大颗粒UO2粉末的粉碎技术和环境污染等问题，同时还能进一步缩短重铀酸铵脱氟还原的工艺过程。

The Copenhagen Accord reached at the United Nations Climate Change Conference 2009 in Copenhagen through the joint efforts of all parties, reconfirming the consensus reached previously, inheriting the attained achievements, pointing out the right direction, remains the momentums of the global endeavors in tackling climate change, and adheres to the principle of "common and differentiated responsibilities", and makes arrangements for the developed countries to take compulsory emission-reduction measures, and for the developing countries to undertake self-determined reduction.

哥本哈根气候变化大会达成的《哥本哈根协议》在各方共同努力下，锁定共识，传承成果，明确方向，维护了全球应对气候变化大局和坚持&共同但有区别的责任&原则，就发达国家实行强制减排和发展中国家采取自主减缓行动做出了安排。

The paper describes searching for reduction coal blending process for zinc vertical retorting ,proposes a new concept of the reduction coal blending technology,i.

对竖罐炼锌用还原煤的配煤方法进行了探索，提出了竖罐炼锌用还原煤配煤技术的新思路。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。