三轴椭球面的面积计算

得到了三轴椭球面面积的一些新的表示,并推知三轴椭球面的面积关于其三个半轴是对称的;作为特例还得到了两类旋转椭球面的面积;最后提出了当三轴椭球面接近于球面时其面积的一个相当准确的近似表达式。     

Improved Dual Algorithm for Constrained Optimization Problems

One class of effective methods for the optimization problem with inequality constraints are to transform the problem to a unconstrained optimization problem by constructing a smooth potential function. In this paper, we modifies a dual algorithm for constrained optimization problems and establishes a corresponding improved dual algorithm; It is proved that the improved dual algorithm has the local Q-superlinear convergence; Finally, we performed numerical experimentation using the improved dual algorithm for many constrained optimization problems, the numerical results are reported to show that it is valid in practical computation.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Extracting multiple layers from data having graph structures

Much data such as geometric image data and drawings have graph structures.Such data are called graph structured data. In order to manage efficiently such graph structured data, we need to analyze and abstract graph structures of such data. The purpose of this paper is to find knowledge representations which indicate plural abstractions of graph structured data. Firstly, we introduce a term graph as a graph pattern having structural variables, and a substitution over term graphs which is graph we also define a multiple layer for S as a pair (D,O) of a set D of term graphs and a list of substitutions. Secondly, for a graph G and a set S of graphs, we present effective algorithms for extracting minimal multiple layers of G and S which give us stratifying abstractions of G and S, respectively. Finally, we report experimental results obtained by applying our algorithms to both artificial data and drawings of power plants which are real world data.     

毛泽东对社会主义经济建设的探索与认识

生产资料所有制的社会主义改造基本完成 后，毛泽东对我国社会主义经济建设的道路进行了艰辛的探索，提出了一些有价值的思想。这些思想主要包括：正确区分和处理好两类不同性质的社会矛盾，正确处理重工业同轻工业、农业的关系，发展社会主义商品生产和利用价值规律的作用，正确处理中央与地方的关系和扩大企业自主权，实现四个现代化和建设现代化的社会主义强国等。这些思想为建设有中国特色社会主义道路的开辟积累了宝贵的经验，对我国社会主义现代化建设事业也将起着长远的指导作用。     

大学生考试焦虑与考试成绩关系的初步探讨

通过了解大学生考试焦虑的特点及规律，探讨大学生考试焦虑与考试成绩的关系。采用考试焦虑测量表进行调查。结果显示，考试焦虑在不同性别、不同专业的大学生之间无显著差异，而与人格密切相关，考试焦虑与某些课程的成绩亦有一定关系(p＜0．05)。从而认为轻度考试焦虑对大学生考试成绩有着积极的影响作用。     

基于案例的推理技术在自动答疑系统中的应用

自动答疑系统是人们从网络获取信息的重要辅助工具。将基于案例的推理技术引入传统的自动答疑系统，并结合用户交互机制，提出了一种基于案例推理的交互式自动答疑引擎。该引擎通过对问题关键字的描述来触发案例，并根据它们与问题的关联程度进行排序；同时，利用交互机制从用户端获得反馈并及时有效地对关键字的权重进行修正，提高了答疑的准确性。此外，对传统二层案例结构进行了三层扩展，提高了系统的可扩展性和易维护性。     

风力干式选煤技术在北宿煤矿的应用

兖州矿区北宿煤矿的煤质属高硫气煤类，燃烧后SO2排放量大，利用受到限制。跨入新世纪后，兖矿集团加快了高硫煤气化合成甲醇及气化发电项目的建议，给矿区高硫煤由燃料煤转向气化用原料煤提供了发展机遇。本文介绍了风力干式选煤技术的原理，针对北宿煤矿煤质特性，从多种选煤工艺方案中比选出投资少、生产成本低、经济效益显著，加工处理后能满足煤化电联产气化用原料煤要求的选煤工艺方案－风力干式选煤。     

特低渗透强水敏储层CO2驱油可行性研究

海拉尔油田兴安岭储层属于特低渗透油藏,且水敏指数较高,常规注水开发效果很差。针对兴安岭储层这一特点,通过室内实验,优选试验区、优化油藏开发方案和跟踪动态分析,研究特低渗透强水敏储层CO2驱油开发的可行性。目前兴安岭储层CO2驱油已取得了矿场试验阶段成果,为加快海拉尔油田上产提供了技术支撑。     

测试转杯纱捻度的退捻加捻法分析

通过对转杯纱结构和测试转杯纱捻度的几种退捻加捻法测试原理的分析,得出了一次退捻加捻法(GB 2543-81)、二重法和三倍退捻加捻法测试棉转杯纱捻度测试结果之间大小的一般规律.在上述三种退捻加捻法中,三倍退捻加捻法测试转杯纱捻度的测试结果最大,其次是二重法和一次退捻加捻法.