实用化学

The calculation methods in the chemical titrimetry after the promulgation of the legal unit of measurement are mainly introduced.

主要介绍法定计量单位颁布以后，化学滴定分析的计算方法，同时推荐一种更具实用意义的通用计算方法，并对其推导过程进行了详细的阐述。

The impurities generating mechanism is explored and corresponding technical plan is provided for determining and diminishing the impurities including diphenyl methane, triphenylmethane, triphenylcarbinol, 4-methy benzophenone, 4-chloro benzophenone and etc. in order to produce high purity benzophenone.

利用化学技术、循环经济和产业生态学原理结合本生产工艺过程的特点确立包括碳循环、苯循环、工艺水循环、氯的回收循环等闭合循环技术组合，设计了光气即产即用技术、倾析分离技术、能量多级利用技术、蒸发—冷凝联用和多热源组合集成技术、二苯甲酮纯化技术等实用方案，实现经济地生产清洁的高纯度产品和生产过程废物零排放。

But there are some problems remined they are easily corrodible and are rather difficult to disperse in the lacquer.

所以研究金属磁粉化学稳定性不好的产生原因及解决办法是它能否实用的主要问题。

To develop new reactions, new compounds and new materials is always the effortful direction of chemical workers, and to obtain valuable products by using compounds which are existing, easily available and cheap is our pursuing goal all the time.

新反应、新物质和新材料的开发一直是化学工作者们努力的方向，利用现有的、易得的和低成本的原料制备出实用的化合物始终是我们追求的目标。

These compounds are of substantial interest both inviewpoints of theory and practical applications, mainlyunder the stimulus to achieve synthetic models either foractive sites of iron-sulfur proteins or for transitionmetal catalysts. This thesis describes the synthesis, structures andconformations of 51 new iron-sulfur cluster complexes,which have been characterized by elemental analysis andstandard spectroscopic methods. In addition, single-crystalX-ray diffraction analyses were performed for 4 representa-tive new compounds. Reactivities of μ-〓 with mono- and di- Grig-nard reagents derived intermediates toward various organicelectrophilic substrates were studied, along with complexa-tion of arynyl-containing iron-sulfur clusters by 〓Thus, several bridged, non-bridged, monomeric, dimeric,homonuclear, heteronuclear iron-sullfur and iron-sulfur co-balt-carbon cluster complexes were synthesized. A novelreaction and convenient route for the synthesis in highyield of tetranuclear iron complexes 〓 containing atetracoordinated sulfur atom was discovered, whereas aplausible mechanism based on experimental results was propo-sed for the formation of the new cluster type.

鉴于有机铁硫原子簇化学在基础理论发展和应用方面的重要意义，因此我们开展了这一课题的研究，并取得以下主要成果： 1、本文共合成了51个新有机铁硫及含钴碳簇基的有机铁硫原子簇配合物，除用元素分析，NMR，IR，MS法表征其结构和构象外，还用X-光衍射技术测得四个代表性配合物的单晶结构和构象； 2、我们业已发现炔基Grignard试剂同〓可形成一种&开环&与&闭环&中间物的平衡混合物，研究该平衡混合物同各种亲电试剂的反应； 3、研究发现了一种可高产率地形成〓含〓四配位硫挛合簇的新化学反应并对此反应提出了—种有趣的反应机理； 4、首次由1，4-二溴丁烷双Grignard试剂与〓制得一种新型铁硫簇双硫阴离子活性中间体，并进而研究了它的亲核反应性能； 5、找到了通过〓的光化学反应来合成簇合物〓-〓的一条有实用价值的新路线。

A spill containment plan specific for the liquid chem- ical sterilant/disinfectant being used should be available whenever and wherever endoscope repro- cessing

无论何时何地进行内镜再处理，一个专用于液体化学灭菌剂/消毒剂使用的泄漏控制计划应是实用的。

Use chemical dyestuffs and reason that machine spinning want far than use natural dyestuffs and reason that hand spinning to be many, it is easy and practical for the former, cater to masses' market; The latter depends on people's craft skill and works arduously, the production efficiency is lower.

使用化学染料和机纺纱的理由要远比使用天然染料和手纺纱的理由多，前者容易而实用，并迎合大众市场；而后者则依靠人的手工技艺和辛苦劳动，生产效率也更低。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。