关于不动点的几个定理

主要讨论了可交换映射的公共不动点问题。     

谈老年高血压特点及治疗误区

阐述老年性高血压的临床特点 ,并提出药物和非药物的治疗对策 ,最后分析了老年性高血压治疗中的六大误区 .     

Unsteady-State Grinding Technology (II) Experimental Studies of Grinding Forces and Force Ratio

As is known to all, grinding force is one of the most important parameters to evaluate the whole process of grinding. Generally, the grinding force is resolved to three component forces, namely, normal grinding force F n, tangential grinding force F t and a component force acting along the direction of longitudinal feed which is usually neglected because of insignificance. The normal grinding force F n has influence upon surface deformation and roughness of workpiece, while the tangential grinding force ...     

Testing for (common) stochastic trends in the presence of structural breaks

This paper considers the problem of testing for the presence of stochastic trends in multivariate time series with structural breaks. The breakpoints are assumed to be known. The testing framework is the multivariate locally best invariant test and the common trend test of Nyblom and Harvey (2000). The asymptotic distributions of the test statistics are derived under a specification of the deterministic component which allows for structural breaks. Asymptotic critical values are provided for the case of a single breakpoint. A modified statistic is then proposed, the asymptotic distribution of which is independent of the breakpoint location and belongs to the Cramér‐von Mises family. This modification is particularly advantageous in the case of multiple breakpoints. It is also shown that the asymptotic distributions of the test statistics are unchanged when seasonal dummy variables and/or weakly dependent exogenous regressors are included. Finally, as an example, the tests are applied to UK macroeconomic data and to data on road casualties in Great Britain. Copyright © 2002 John Wiley & Sons, Ltd.     

几个新的压缩型映象的公共不动点定理

证明了几个新的弱交换压缩型映象的公共不动点定理，改进和推广了某些已知结果。     

在普通中小学教学班普及多媒体教室的研究与实践

中小学教师迫切需要在多媒体教室用CAI课件进行教学活动。但各校仅有的一个多媒体教室只能满足个别教师的观摩课或比赛课，极大地制约了教学一线教师的教学改革进程。本文阐述了如何将全校的普通教学班教室均改建成多媒体教室的可行性方案和用几千元建立一个多媒体普通教室的实践经验。     

他人信心对自信心形成与发展的作用初探──兼谈成功教育的主要内容

自信心（Ｓｅｌｆ－ｃｏｎｆｉｄｅｎｃｅ）是一个重要的心理品质．作者从他人信心的角度，提出了关于自信心的形成与发展假说；他人信心（ＦａｉｔｈｏｆＯｔｈｅｒＰｅｏｐｌｅ）──成功的体验──自信心（自信心形成假说）；他人信心＋自信心１──成功的体验──自信心２（自信心发展假说），并分析了每一假说中的种种情况．     

曲面立体相贯线的解析作图

本文以解析形式,对具有公共对称平面的两二次回转曲面的相贯线,在其公共对称平面上的投影性质进行了初步探讨,得出投影为二次曲线的定理;并以形数结合,研讨了相贯线的求作问题,提出了新的图解方法——解析作图法。文中还应用亲似对应原理,解决了用辅助平面法和辅助球面法都不曾解决的斜交特殊点的求作。这些特殊点包括:明显影响相贯线投影精确性的极限点(如文中的最右点),二次曲线的顶点,以及相贯线可见性分界点等。     

试论英语零位冠词

有关定冠词和不定冠词的专著有一些,但专门论述零位冠词用法的专著很少见.本文试图从论述零位冠词的用法特点,来解决使用冠词这一难题的一个方面.冠词的用法与名词的种类和性质有着密切的关系.因此,本文按照普通名词(包括具体名词、物质名词。抽象名词)和专有名词与零位冠词的关系进行叙述.除了谈到一些一般现象外,还列举了一些特殊情况,并与定冠词与不定冠词进行了必要的对比,以便能较深入,较全面地阐明零位冠词的用法与特点.     

通用查询模块的设计与实现

介绍了在不同的大型数据库系统上，如何设计并实现满足用户多样性，多变性要求的通用查询模块。以及它在管理系统中的地位，必要性及实现的技术复杂性，并介绍了用PowerBuilder工具来实现的技术细节。