关于广义Fermat数的奇素因子的一个性质

对于广义Fermat数F(a ,b ,n) =a2 n +b2 n ,利用简洁的方法得到了它的奇素因子的一个性质 ,作为文献 [1 ]、[2 ]、[3]中Fermat数性质的推广     

王谢家族文艺门风试探

五朝时期(东晋、宋、齐、梁、陈)王谢家族的文学艺术生活十分丰富,王谢子弟人才辈出,世代不绝。其长盛不衰的原因在于他们累世位居高官,随之而来的物质生活极端优裕,为他们保持优美门风提供了物质基础。此外,社会上层的重视以及王谢家族维系家声的自身要求也是形成这一局面的原因。     

Disinfection by-products effect on swimmers oxidative stress and respiratory damage

Disinfection by-products (DBPs) are generated through the reaction of chlorine with organic and inorganic matter in indoor swimming pools. Different DBPs are present in indoor swimming pools. This study evaluated the effects of different chlorinated formations in oxidative stress and lung damage in 20 swimmers after 40?min of aerobic swimming in 3 indoor pools with different characteristics. Biological samples were collected to measure lung damage (serum-surfactant-associated proteins A and B), oxidative stress parameters (plasma protein carbonylation and malondialdehyde, and whole-blood glutathione oxidation), and swimming exertion values (blood lactate) before and after exercise. Free chlorine and combined chlorine in water, and chlorine in air samples were determined in all the swimming pools. Chlorination as disinfection treatment led to the formation of chloramines in water samples, mainly mono- and dichloramine. However, free chlorine was the predominate species in ultraviolet-treated swimming pool. Levels of total chlorine increased as a function of the swimming activity in chlorinated swimming pools. The lower quality of the installation resulted in a higher content of total chlorine, especially in air samples, and therefore a higher exposure of the swimmer to DBPs. However, the concentration level of chlorinated DBPs did not result in significant variation in serum-surfactant-associated proteins A and oxidative stress parameters in swimmers. In conclusion, the quality of the installation affected the DBPs concentration; however, it did not lead to lung epithelial damage and oxidative stress parameters in swimmers.     

有关广义第二类Stirling数S~(λ，μ)(η，κ)的研究

本文讨论了由序列{λ,λ+μ,λ+2μ…,λ+ημ…}产生的第二类广义Stirling数S~(λ,μ)(η,κ),通过对其相关性质的深入研究,我们得到了三个重要的定理。     

一类包含高阶Bernoulli数和高阶Euler数的积分计算公式

给出了一类包含高阶Bernoulli数和高阶Euler数的积分计算公式．     

区间上素数之和表示自然数个数的渐近式

本文用算术的方法探讨区间上素数与自然数之间的关系。根据素数定理给出素数之和表示自然数个数的渐近式。     

对环比发展速度变异指标的探讨

变异指标在静态变量数列中的应用已相当广泛和普及,但动态数列特别是环比发展速度动态数列的平均发展速度的代表性,就观察其变异程度,评价其平均发展速度的代表的目的而言,仍可采用标准差系数。     

论二阶齐次线性递推数列的性质

研究了二阶齐次线性递推数列的性质.     

新乡市外语培训机构现状的调查及反思

当今社会各种竞争日益激烈，英语作为一门世界性语言越来越受到人们重视。近年来新乡外语培训机构林林总总，笔者在2004年暑假期间走访了几家较具规模和竞争实力的外语培训机构，对他们的招生情况进行了初步的调查，并根据调查结果，对一些看似反常的现象进行了详细的分析。笔者认为反常现象其实并不反常，其背后都有其深刻的原因。最后，笔者对新乡市各外语培训机构今后的发展提出了一些个人的意见和建议，希望能对他们有所帮助，同时也希望在各培训机构的共同努力下，新乡市的外语培训市场能早日步入正轨。     

计算机技术在高中数学教学中的应用

在高中数学课堂教学中探索利用计算机辅助教学,让多媒体在数学教学中体现最佳效果,可以使学生的思维能力不断向高层次发展.