p~4阶群与李环结构之间的关系

继单群分类定理完成之后,有限p群逐渐成为有限群研究的热点.证明了在p~4阶群G关于其子群N(G)={a-pb-papbp,c-p2b-p2ap 2-pbp2c pa,b,c∈G}的商群中定义加法和Lie乘运算为aN(G)bN(G)=(ab)pN(G),aN(G)bN(G)[a,b]N(G),则GN(G)成为Lie环.由于Lie环的可算性,这一结论有利于对p4阶群的结构进行研究.     

L─噻唑烷─4─甲酸二硫代甲酸钠及莫Co~(2 )离子配合物合成和IR光谱研究

本文合成了L─噻唑烷─甲酸二硫代甲酸钠和Co2 配合物,其分子式为MX2（M＝Co2 ,X＝L─噻唑烷─4─甲酸二硫代甲酸离子）．红外光谱研究表明配体与Co2 为双齿配位．     

平行双光透电极吸收光谱电化学的研究

推道了工作电极为多个相互平行的光透电极时,大幅度电位阶跃和线性电位扫描扰动下可逆电极过程的光谱电化学响应方程,理论上得到了５＊１０＾－３ｍｏｌ／ＬＫ４Ｆｅ（ＣＮ）６＋０．５ｍｏｌ／ＬＫＣｌ水溶液体系双光透电极光谱电化学实验的支持。,表明采用多光透电极为工作电极是提高光谱电化学 灵敏度的可能途径。     

IPv4与IPv6协议性能比较浅谈

Internet的飞速发展,是设计者始料不及的.目前IPv4协议的局限性已严重制约了Internet的健康发展.IPv6则针对IPv4的不足,采用独特的技术解决了IPv4在地址短缺、网络速度和安全性方面的问题.对两种协议的网络速度和安全性能进行对比分析.     

A4分子的定性分子轨道处理

本文用定性分子轨道理论和碎片轨道法构造了氢原子簇Ｈ４和代表性元素磷的四原子簇合物Ｐ４的分子轨道。可得分子轨道的形状和相对能级次序与定理计算结果一致。     

服务流程对提高4S店售后服务客户满意度的影响

通过对4S店服务流程的详细分析,使得我们认识到通过认真执行服务流程的每个环节这一基本服务要求,对提高客户满意度起着十分关键的作用。     

Mammalian arylsulfatases A and B: relative rates of hydrolysis of artificial substrates

Summary Rodent and bovine arylsulfatase B hydrolyze 4-methylumbelliferyl sulfate (4MUS) 10- to 30-fold more efficiently than arylsulfatase A. Therefore, 4MUS grossly underestimates arylsulfatase A activity in the presence of excess arylsulfatase B.     

Inhibitory effects of phenolic compounds on CCl4-induced microsomal lipid peroxidation

Summary The antiperoxidative effects of 35 phenolic compounds, most of them belonging to the flavonoid class, were investigated using CCl₄-induced peroxidation of rat liver microsomes. This system was rather insensitive to gallic acid, methyl gallate and ellagic acid. Nevertheless it was inhibited by flavonoids and structure/activity relationships were established. The most potent compounds were gardenin D, luteolin, apigenin (flavones), datiscetin, morin, galangin (flavonols), eriodictyol (flavanone), amentoflavone (biflavone) and the reference compound, (+)-catechin. The natural polymethoxyflavone gardenin D has shown a potency comparable to that of (+)-catechin and higher than that of silybin. Thus, it may be considered as a new type of natural antioxidant with potential therapeutical applications.     

Poser4内存点的外部控制

动态分析Poser4系统以及内存点,得到内存点工作原理,给出内存点的外部控制通用方法。     

C4烃在甲乙酮溶剂体系中的相对挥发度

用静态法测定不同温度下正丁烷，丁烯－1，顺丁烯－2与甲乙酮溶剂体系的压力－组成数据，并与纯C4烃的饱和蒸汽压曲线比较，可以看出，甲乙酮溶剂改变了正丁烷与丁烯之间的相对挥发度，确定了萃取精馏分离丁烯与丁烷的关键组分为正丁烷与丁烯－1，其相对挥发度为1．1－1．2。