一个有界弹性项Duffing方程周期解的存在性

证明了有界弹性项Duffing方程x″ arccotx=p(t)的周期解的存在性,其中周期为2π的连续函数p(t)满足0     

陈骥《文则》的现代修辞观

陈骏的《文则》是中国历史上第一部谈及文法修辞的专著，其价值是多方面的，本文从陈骏创作实践中运用多种积极辞格阐述相关的修辞理论，以评价他的积极修辞观；《文则》“虽以事出创造，不无瑕疵”，但论及了语法、句法、辞格、文章、风格、文体等多方面内容，初步建立了大修辞学体系，体现了现代修辞学界所倡导的广义修辞观；陈骏虽是对《诗》《书》《礼》《易》《春秋》等静态书面语言的考察，但用动态的辩证的眼光提出了不少真知灼见，体现了动态的辩证的修辞观。     

成像公式法测量望远镜放大倍数

介绍用成像公式法测量望远镜放大倍数的方法,并对这种测量方法进行改进提高测量的精确度.     

具有非凸条件的单个守恒律初边值问题整体弱熵解的结构

在流函数具有有限个拐点,初始值为两段常数和边界值为常数的条件下,研究非凸单个守恒律的初边值问题整体弱熵解的结构、初等波与边界的相互作用情况以及弱熵解在边界附近的性态.     

与年龄相关的非线性时变种群系统的L2(Q)-解

本文讨论与年龄相关的非线性时变种群系统（P）的l^2（Q）－解，为进一步研究种群系统的最优控制问题提供了必要的理论基础．     

大学“通才教育”背景下《无机化学》教学改革探讨

无机化学是化学及相关专业的一门重要基础课。在通才教育背景下，如何深化无机化学教学改革？本文在教学理念、教学内容、教学方法和评价体系等四个方面进行了初步的探讨。     

Preface

Different from traditional tax audit, supervision with self-audit is a combination of audit by the taxpayer himself and audit by the tax authority. This paper mainly studies a taxpayer’s optimal policy of tax evasion under supervision with self-audit and its related properties, in order to deduce some effective suggestions and theoretical bases to restrain tax evasion. Assuming that only a certain proportion of evaded tax can be discovered when the audit is executed, the authors first formulate a static model with self-audit. This model is divided into two stages. At the first stage, taxpayers declare their taxes, then the tax authority chooses audit objects, based on a known probability, and announces the result; if the taxpayer is chosen, he will enter the second stage, during which he has a chance to pay the evaded tax and the corresponding late fees and then is audited by the tax authority. The authors show the existence and uniqueness of the optimal amount of tax evasion at the first stage and the optimal proportion to self-expose at the second stage. The authors also discuss the related properties of the interior solution, and do elasticity analyses on some parameters. Besides, the authors extend the static model into the corresponding two-period model, and study the existence and uniqueness of the solution of the extended model. Finally, under the assumption that tax evasion can only be discovered with a certain probability when the audit is executed, the authors formulate another static model with self-audit and investigate its properties. This research is partially supported by the National Natural Science Foundation of China under Grant Nos. 60674082, 70221001, and 70731003.     

提升普通高校学报影响力的措施和方法

分析了普通高校学报影响因子低、影响力小的原因,重点论述了提高普通高校学报被引频次、影响因子和影响力的措施和方法.     

关于L——函数的积分均值公式

利用 Hurwitz zeta—函数的函数方程及其解析方法给 Dirichlet L—函数的二次均值的一个较强的渐近公式.     

论内含报酬率的几何解法

<正> 内含报酬率,又称内部报酬率,是指能使投资项目的预期现金流入量现值等于预期现金流出量现值的贴现率,即能使投资项目的净现值为零的贴现率。内含报酬率常可用于分析评价投资项目的可行性,以便进行投资决策。对于单一的投资方案,当内含报酬率高于企业的资金成本率时,可以考