影响我国足球联赛上座率的因素与对策研究

上座率是联赛的根本。研究表明影响观众出席人数的主要因素包括:球迷动机因素、比赛吸引力、经济因素、竞争因素、人口统计学因素、体育场因素、体育对社会的价值、体育专注和体育迷地位。除此之外,国家队比赛成绩、比赛公正程度、赛制安排等也影响比赛的上座率。     

理性·求实·辩证--再评书次号的统一

从书次号的定义和功能出发 ,阐述研究书次号的理性认识、实事求是态度和辩证法思想。     

合理计算 巧解妙证

通过对中学教学中若干例题特征的观察、分析,条件的适当转化,说明了如何巧解妙证一些数学题。     

初中代数入门教学值得注意的问题

要使新生尽快适应初中阶段的学习,必须从数的概念和具体显现形式的多样性、初中与小学数学内容之间的联系等方面,注重入门阶段的学习,同时,还要运用直观教学,创设情景,趣引新知识,灵活运用多种教法,尽快促使学生实现学习方式的和观念的转变.     

我国男子撑竿跳高腾起高度的能量守恒定律分析

通过录像研究、资料查阅、数理分析等方法,依据能量转化与守恒定律,分析了撑竿跳高过程中的能量来源与转化, 总结出助跑、起跳、团身展体、引体推竿这四个过程是动能获得的根源;在整个跳跃过程中,一部分能量被损耗,另一部分转化为身体重心腾至最高点时的势能和过竿时的水平动能, 并提出:加强能量来源与减少能量损失是获得较高腾高的根本方法.     

怎样求数列前n项的和

数列是高中数学的重要内容之一,也是高考必须的知识点,本文就数列前 n 项的求和问题作了较细的分类讨论。对掌握数列前 n 项求和问题有较大帮助。     

2001年 四种图书馆情报学核心期刊自引情况分析

运用文献计量学方法，对2001年四种图书馆情报学核心期刊的自引情况进行了定量分析，并提供了有关项目研究指标的统计数据和测试结果，为期刊及其载文情况的评价提供了客观、真实的依据和有价值的参考。     

矩阵光学的光路可逆性研究

本文研究了矩阵光学中 ,矩阵逆变换和物理逆光路的逻辑自洽问题 ,揭示了抽象的矩阵操作和实际的物理过程的一致性 ,最后指出 ,它们的统一性 ,本质上在于宏观物理现象的宇称守恒性。     

Environmentally-induced stone decay: the cumulative effects of crystallization–hydration cycles on a Lincolnshire oopelsparite limestone

An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.     

"复本数模式"与数字图书发展之我见

针对目前有关数字图书“复本数”销售模式的争论,提出笔者自己的研究观点,即“复本数”销售模式是先进可行的,其“册数”的局限性是人为的,而不是其固有的缺陷。同时,要真正实施“复本数”销售模式,发挥其保障出版社和作者的利益,从而维系整个数字图书产业健康、可持续发展的作用,就必须找到复本价格过高的根本原因,制定合理的复本价格体系。