化学

The shape of star formation rate density versus the redshift in the closed box is quite similar to the Madau plot drawn from the UV luminosity in the observation of high redshift.

我们在星系化学演化的研究中发现：变化的IMF形式对星系化学演化结果有明显的影响；星系化学演化总趋势是随时间演化气体含量逐渐减少，金属含量逐渐增加；在我们所取的简单星系模型内部恒星生成率密度随红移的演化关系能够在一定程度上体现高红移观测中所得到的Madau图的特性。

The company was established in 2001, covers an area of 16,000 square meters, are set production, sale and service of professional manufacturers, professional production·, chemical pure, pure electronics, industrial pure content specifications such as sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide, hydrogen peroxide, ammonia and other chemical raw materials and chemical reagents, as well as multi-layer circuit boards, flexible circuits board, semiconductor, electronic plating, chemical plating, wastewater treatment and a variety of electronic device manufacturers to provide supporting services.

公司成立于2001年，占地面积16000平方米，是集生产、销售、服务于一体的专业型厂商，专业生产分析纯、化学纯、电子纯、工业纯等各种规格含量的硫酸、硝酸、盐酸、氢氧化钠、双氧水、氨水等各种化工原料及化学试剂，并为多层电路板、软性电路板、半导体、电子电镀、化学电镀、废水处理及各种电子器件生产厂商提供配套服务。

Second, silver, silver brightener, cyanide silver-plated brightener, cyanide plating silver, shining silver additives, silver brightener, functional plating thickness silver brightener, adornment plating thickness brightener, silver and silver additives, silver and silver prevent discoloration protective agent, LED dedicated silver plated cryoprotectants, rolling, 2000, ammat light nickel plating SUPER - 6 brightener, nickel plating nickel brightener rolling etc, high phosphorus and phosphorus chemical nickel environmental protect chemical nickel, low phosphorus chemical nickel or cyanogens environmental protection electroless plating silver.

二、银光剂、银光亮剂、镀银添加剂、镀银光剂、氰化镀银光亮剂、氰化物镀银光剂、光亮镀银添加剂、镀银光亮剂、功能性镀厚银光亮剂、装饰镀厚银光剂、半光亮镀银添加剂、银保护剂、银防变色剂、LED专用银保护剂，滚镀镍光剂、安美特SUPER-6号挂镀镍光亮剂、滚挂镀镍光亮剂等、高磷环保化学镍、中磷化保化学镍、低磷环保化学镍、无氰环保化学镀银。

This paper points out that research orientation of chemical experiments mainly focuses on its simplification, improvement, innovation, miniature, green chemical experiments, and the self-making of common chemical reagent.

文章指明了化学实验研究方向主要是化学实验的简约化、实验的改进与创新、微型实验研究、绿色化学与实验的研究、实验常见试剂的自制方法研究。

Jiang Ye Yiyang colored plant since 1997 zhejiang for the production of three Group took the body with yellow brass, there have been more than a decade of history, maturing technology, complete equipment, product quality higher than the national standards in the chemical products Composition, tolerance level of accuracy, mechanical properties, both inside and outside surface quality in areas such as technical requirements, Reflects a production capacity of enterprises, technical and management level.

化学成分，化学成分 GB/T5231—2001中的 H65化学成分范围，为使其性能更有保障，对主成分及有害杂质进行更严格控制，制订企业标准（Q/JY001—2004）。（2）公差及机械性能参照 GB/T1527—2006拉制管标准和浙江三花集团企业标准 Q/ZSH05·099—2002，制订企业标准（Q/JY001—2004），对其进行严格控制。三位四通阀的工作环境是液态或汽化的氟利昂等冷凝剂，其内腔气密性要求十分苛刻，这就需要 AC 黄铜管的内、外表面质量有极高表面质量，内、外表面光洁，无划伤、拉痕、起皮、沙眼、夹杂等加工缺陷，无酸、油、润滑等残留附着物。由于 AC 黄铜管在制作四通阀时，需要锯切、车削、冲孔等机加工，因此对公差精度要求很高。

The chemiluminescent reagent is the basis of CL analysis and its properties are very important for increasing the sensitivity and extending the application of this method.

化学发光试剂是化学发光分析的基础，开发和使用发光量子产率高的试剂，对提高化学发光分析的灵敏度和扩大其应用范围具有十分重要的意义。

it is very important to strengthen the environmental protection consciousness education and the environmental protection education of legal system in chemistry teaching.

化学教学中加强环保意识教育和环保法制教育十分重要，如让学生深刻认识化学与环境的关系，改进实验教学，科学使用化学器材、药剂，组织实地参观。

Chemical speciation of heavy metal is hot topic in soil science, plant nutrition, and environmental science.

重金属化学形态是近年来土壤化学、植物营养和环境科学研究领域的一个热点和难点，利用重金属的化学形态分布和含量变化来评价重金属的生物可利用性，有利于全面研究重金属的危害性和治理重金属污染土壤。

Forensic chemistry.

法律化学，刑事侦破化学，化学破案术。

The results show that the ore-controlling strata or source beds related to gold deposits all show high background values of gold; the gold and other associated ore-forming elem...

微量金数据除部分样品运用化学比色法外，主要采用化学浓集-发射光谱测定方法。实验结果表明，化学-光谱法测定微量金相对平均误差为18％；相对平均偏差重复性和再

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。