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《精细与专用化学品》2009,(11):18-18
一、国家明令禁止使用的农药(23种)六六六,滴滴涕,毒杀芬,二溴氯丙烷,杀虫脒,二溴乙烷,除草醚,艾氏剂,狄氏剂,汞制剂,砷、铅类,敌枯双,氟乙酰胺,甘氟,毒鼠强,氟乙酸钠,毒鼠 相似文献
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主要介绍高精度塑料零件的选材要求,研究塑料切削加工的特点,针对影响塑料切削加工质量的因素提出了具体的对策及经实践验证可改善和提高塑料切削加工质量的方法,探讨了铣切加工高精度塑料零件时的铣切工艺、铣切刀具和加工参数的选择原则。 相似文献
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Albert Erkip 《Polymer》2004,45(2):641-648
The fluctuations of residues of proteins about their equilibrium configurations are analyzed by the Langevin equation. Residue pairs that are covalently bonded and those that are within a given cutoff distance of each other are assumed to be connected by linear springs. The actions of the solvent and intramolecular interactions on each residue are treated as random noise. The correlations of fluctuations resulting from the solution of the Langevin equation are observed to be identical to those obtained by the Gaussian Network Model based on equilibrium statistical mechanics. The time-delayed correlations of fluctuations, and the response of the protein to a given frequency and to a window of frequencies are determined. The fluctuations of the residues resulting from a given fixed externally applied frequency are evaluated for different modes of the system. Synchronous and asynchronous components of correlations for different modes are formulated. The findings of the present paper are applied to the 241 residue protein S. marcescens endonuclease (1QL0). 相似文献
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详细阐述了金属腐蚀的危害机理,分析了影响数控机床腐蚀的因素,介绍了防腐涂料及防腐技术在数控机床上的应用现状,提出了数控机床整机防腐的对策及防锈措施。 相似文献
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阐述了计算机模拟的分类、应用,以及用于计算机模拟的软件工具及其特点和不同的应用范围。对各个软件的优缺点进行了对比,着重模拟了吹塑塑料薄膜过程,并用AucoCAD、Autolisp、3dMAX、Flash等软件制作了实例,用图形生动、形象地展示了塑料成型的过程。 相似文献
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介绍了食品用氟树脂产品基本情况及影响氟树脂产品安全性的因素,列出并分析了欧盟、美国和中国针对食品用氟树脂产品的管理法规,为我国针对食品用氟树脂及其产品的相关食品安全国家标准的制定提出了建议。 相似文献