信息集成研究回顾与展望

叙述了国内信息集成研究的现状、国内信息集成研究的发展脉络,指出了其存在的问题,探讨了信息集成研究的发展方向。     

浅谈科学计算可视化在教育领域的应用

通过对科学计算可视化技术的分析，探讨了科学计算可视化应用于教育的机理和方法。并给出了具体的应用实例。     

时变条件下有宵禁限制的最短路问题

在组合优化过程中,往往需要获得从起点到终点之间的最短路,而其所考虑的目标可能是一个与时间相关的变量.同时,对于网络中的节点往往有宵禁的限制(curfews).给出时变条件下有软、硬宵禁限制的最短路模型,设计了求解时变条件下有宵禁限制最短路的算法,并对算法的复杂性进行了分析.最后给出了一个应用算例.     

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.     

关于农业税取消后乡镇政府职能转变的思考

论述了我国乡镇政府的现状及存在的问题,分析了乡镇政府职能转变的方向,提出了乡镇政府职能转变应注意的问题。     

谈高校图书馆读者不良行为的防治措施

对高校图书馆管理实践中的有些读者不良行为进行了分析,并提出了制止违章行为的有效措施。     

两性木素絮凝剂用于污泥的调质处理

以木素为原料制备了两性絮凝剂LSDC，并将其用于污泥的调质处理。实验结果表明LSDC可使污泥沉降速度提高至原始污泥的1．25倍，污泥的过滤比阻则降低至原始污泥的40％左右，泥饼含水率由93％降低至80％。两性木素絮凝剂在污泥调质处理中的应用为木素的高附加值利用提供了新的途径。     

基于水杨醛的手性Salen-Mn(Ⅲ)配合物与DNA相互作用研究

以水扬醛为基本原料,合成了2种具有手性的Salen-Mn配合物,通过圆二色(CD)光谱、吸收光谱、粘度和凝胶电泳等方法研究了2种配合物与DNA的作用.结果显示:这2种配合物不以插入模式与DNA结合,但显示出化学核酸酶性质,在H2O2存在下,能够断裂DNA,将pBR 322 DNA由formⅠ转化为formⅡ.图6,参12.     

浅谈高校实行成本管理的必要性和可行性及其组织措施

介绍了当前高等学校实行成本管理的必要性,探讨了高等学校实行成本管理的可行性,阐述了高等学校实行成本管理的组织措施。     

大型矿用挖掘机控制系统的特点及发展方向

比较了发电机—电动机组直流调速系统、可控硅直流调速系统、交流变频调速系统这3种调速系统在矿用挖掘机上的应用情况。