空间碎片地基雷达探测综述

分析了空间碎片地基雷达探测的必要性和现实意义,介绍了国外有代表性的地基雷达工作概况,在此基础上,给出了描述空间碎片的轨道参量和物理参量,并对空间碎片地基雷达探测所需的关键技术进行了探讨。     

清江流域水库滑坡数据库系统开发

介绍了清江流域水库滑坡数据库系统的数据结构、功能及窗口界面等特点。本系统利用VFP的可视化和面向对象的编程技术，实现了数据库系统强大的数据查询、数据维护、报表打印及系统维护管理功能，并具有与WINDOWS系统完全一致的窗口界面。     

Base isolation for near‐fault motions

Three analytical studies of base‐isolated structures are carried out. First, six pairs of near‐fault motions oriented in directions parallel and normal to the fault were considered, and the average of the response spectra of these earthquake records was obtained. This study shows that in addition to pulse‐type displacements, these motions contain significant energy at high frequencies and that the real and pseudo‐velocity spectra are quite different. The second analysis modelled the response of a model of an isolated structure with a flexible superstructure to study the effect of isolation damping on the performance of different isolation systems under near‐fault motion. The results show that there exists a value of isolation system damping for which the superstructure acceleration for a given structural system attains a minimum value under near‐fault motion. Therefore, although increasing the bearing damping beyond a certain value may decrease the bearing displacement, it may transmit higher accelerations into the superstructure. Finally, the behaviour of four isolation systems subjected to the normal component of each of the near‐fault motions were studied, showing that EDF type isolation systems may be the optimum choice for the design of isolated structures in near‐fault locations. Copyright © 2001 John Wiley & Sons, Ltd.     

Characteristics of Oil Contamination and Numerical Modelling of Its Transport in Fracture-Karst Water in Zibo City,China

In this paper, the hydraulic characteristics of the fracture-karst aquifer and the distribution patterns of petrochemical contaminants are studied. Then, a numerical model using the mixed Eulerian-Lagrangian approach is constructed to predict the distribution and transport of petrochemical compounds in groundwater. The results of numerical modelling and sensitivity analysis show that it may be a workable way for aquifer remediation to combine contamination sources control and capture zone establishment.     

沉降监测基准网与监测网精度探讨

为了保证建筑物在沉降过程中变形观测点的观测成果的连续性、可比性，对沉降监测中基准网与监测网的观测精度匹配问题进行了详细的探讨，得出了有参考价值的结论。     

我国东部夏季降水百年雨型的多时间尺度变化特征研究

本文用1900-1950年的我国实测的与内插的降水、气温资料，结合近代先进的统计方法对立了1900-1950年我国东部夏季降水雨型序列，并将其与已有的近48年（1951-1998年）的夏季雨型序列相衔接，进而研究了近百年我国夏季雨带的演变规律及其与ENSO的关系，此外，还研究了百年夏季雨型与大气活动中心在基本态时间尺度上的关系，研究了北太平洋涛动和我国夏季降水的关系。     

数字地图电子版符号制作模块的实现

文中分析了地图上点、线、面符号的特点及构造原理 ,论述了采用描述语言的方法建立符号库的方法和过程 ,在此基础上设计了用于点、线、面符号库的存储数据结构 ,并叙述了符号绘制的实现方法     

开发信息新价值及其新领域—记第47届国际文献与信息联合会大会

第４７届国际文献与信息联合会大会于１９９４年１０月２－９日在日本大宫市召开，来自世界各国的代表４００余人参加了会议。本文从五个方面反映了这次大会的概况。     

地籍数据库中地块分割与合并方法的研究

本文对籍信息管理系统中有关地块分割与合并的方法进行了研究，给出了一种适合计算机处理又能满足实际需要的方法。     

基于规则知识表示的模型单元选择专家系统的实现

本文根据矿床统计预测中模型单元选择的领域专家知识，用基于规则知识表示的ＧＵＲＵ专家系统工具及Ｃ语言建造了一个模型单元选择的专家系统及其咨询界面，解决了如何确定最佳的模型单元的这一难题，最终形成了模型单元数据库，这就提高了数学模型的精度和预测的效果，为用户提供了一个高效率的计算机辅助工具。