Comparative Analysis of Seismic Response Characteristics of Pile-Soil-Stnicture Interaction System

The study on the earthquake-resistant performance of a pile-soil-structure interaction system is a relatively complicated and primarily important issue in civil engineering practice. In this paper, a computational model and computation procedures for pile-supported structures, which can duly consider the pile-soil interaction effect, are established by the finite element method. Numerical implementation is made in the time domain. A simplified approximation for the seismic response analysis of pile-soil-structure systems is briefly presented. Then a comparative study is performed for an engineering example with numerical results computed respectively by the finite element method and the simplified method. Through comparative analysis, it is shown that the results obtained by the simplified method well agree with those achieved by the finite element method. The numerical results and findings will offer instructive guidelines for earthquake-resistant analysis and design of pile-supported structures.     

基于数码相机立体像对的物体3维信息快速获取方法

研究了数码相机的内方位元素检测和镜头畸变差校正，应用近景摄影测量的原理与方法，提出了一种基于立体像对无物方控制的物体表面3维模型信息快速获取方法，试验表明，该方法获取3维信息速度快、精度较高。同时文中还比较了可变焦数码相机和固定焦距相机在获取3维信息精度方面的差异。     

北京地区Pi2脉动和地磁AE指数的关系

分析了北京地区1998年1月1日至3月26日和4月24日至6月13日共136天记录的Pi2脉动事件特性,并与同时期亚暴AE指数进行了对比.结果发现,在北京地区越靠近日侧,观测到的Pi2脉动事件越少,幅度也越小.并不是每次亚暴都能激发空腔振荡模,亚暴强度的增加也并不代表空腔振荡模产生概率的增加.随着亚暴AE指数的增大,Pi2脉动的平均幅度基本上也在增大.但也有例外,可能是由于北京观测地点距离亚暴电流楔位置较远造成的.北京地区的Pi2脉动可以发生于亚暴的整个过程中,从AE指数开始增长期间（亚暴增长相）,一直到亚暴AE指数恢复正常（亚暴膨胀相后期）.某些亚暴没有对应着Pi2脉动事件,其AE指数从小于200nT一直到800nT以上.从观测数据来看,北京地区虽然纬度分区在低纬区域,但其Pi2脉动的特性与中纬Pi2特性更为靠近.所以不宜用北京地区Pi2来预报亚暴,以避免误报和漏报.     

生态屏障约束下的综合功能区划研究——以云南省昭通市为例(英文)

Ecological shelter zones reconstruction is an ecosystem restoration and conserva-tion project aimed to the ecological safety of nations,regions and basins. Reconstruction of ecological shelter zones of the upper reaches of the Yangtze River became one of the most important tasks of Western Development strategy. This article,taking Zhaotong as an exam-ple,studies the functional regionalization of ecological shelter zones. The study supplies a case for functional regionalization of small and medium regions whose main tasks are envi-ronment reservation. With the guidance of theories of functional regionalization,and based on the analysis of Zhaotong's natural,ecological and socioeconomic factors,the paper suggests five principles for factors selection. These principles include: (1) reversing order evaluation; (2) selecting main factors; (3) keeping the integrality of administrative regions of towns; and (4) making the products acceptable by local government. To analyze spatial status of selected factors,LUCC data in 2002,1:50,000 relief maps and town-unit socioeconomic statistical data in 2004 are used. RS and GIS tools are also applied to melt traditional and modern geo-graphical methods. This would be useful to functional regionalization research in mountain-ous areas. As a conclusion,the leading functional regions of ecological conservation or economic development are suggested,respectively. Zhaotong city is divided into two-level functional regions. The first-level includes three leading functional regions and they will lead developing direction of sub-regions. The second-level includes eight sub-regions,which are policy implemented regions,and will supply guidance to Zhaotong's ecological shelter zones reconstruction.     

新技术条件下电子地图的现状及发展趋势分析

IT领域迅速发生的技术变革为空间信息获取、处理、分析与表达提供了创新动力与技术升级空间,电子地图作为空间信息可视化产品之一,以不同层次的多种形式广泛应用于公众及行业领域。作者着眼于电子地图的产品模式、技术手段、信息组织、功能拓展等方面,结合多年研发实践,分别对其现状及发展趋势进行深入分析。最后,作者认为开发新一代电子地图著作工具将成为目前这一领域的紧迫课题。     

湖泊湿地生态地球化学评价的标准体系

湖泊湿地生态地球化学评价的研究重点为湖泊湿地生态系统中的重金属、植物营养元素及一些有机污染物,评价标准体系相应地包括水质基准、营养物基准、水体沉积物质量基准、饮用水卫生标准、土壤环境质量标准、食品卫生标准、湖泊水库富营养化标准等。     

1:25万那曲县幅地质调查成果与进展

地层方面,将测区地层划分为冈底斯-腾冲地层区和班公错-怒江结合带,班公湖-怒江结合带中又划分出聂荣微地块和觉翁-余拉山-下秋卡混杂带两个小区;按变质岩调查方法解体了聂荣地块;对原大面积分布的拉贡塘组进行了有效的解体;新建立嘎加组;恢复了郭曲群;将木嘎岗日岩群解体出3个岩组。岩石方面,在测区南部新发现了一套晚二叠世—早三叠世蛇绿岩。构造方面,构造单元表现为各组-下秋卡结合带和桑雄-那曲-麦地卡板片的构造格局;新发现达仁乡夺列蛇绿岩体。     

用VB语言实现地震动态演示

Ｖ Ｂ 编程语言提供了图形环境,能可视化的设计窗体和控件。本文介绍了应用该设计语言的特性如何实现地震资料的动态显示过程。     

Barium Anomaly and Its Geochemical Significance

１．Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｍｕｌｔｉｅｌｅｍｅｎｔｖａｒｉａｔｉｏｎｄｉａｇｒａｍｓａｒｅｖｅｒｙｕｓｅｆｕｌｉｎｔｈｅｇｅｏｃｈｅｍｉｃａｌｓｔｕｄｙ．ＯｎｅｏｆｔｈｅｍｉｓｔｈｅＰｅａｒｃｅｄｉａｇｒａｍ,ｔｈｅＭＯＲＢｎｏｒｍａｌｉｚｅｄｍｕｌｔｉｅｌｅｍｅｎｔｖａｒｉａｔｉｏｎｄｉａｇｒａｍｇｉｖｅｎｂｙＰｅａｒｃｅ（１９８３）．ＴｈｉｓｄｉａｇｒａｍｓｈｏｗｓｔｈｅｒｅｌａｔｉｖｅｄｅｐｌｅｔｉｏｎｓｏｆＨＦＳｅｌｅｍｅｎｔｓＮｂ,ＴｉａｎｄＰ．Ｉｎａｄｄｉｔｉｏｎ,ｔｈｅ…     

储集层测井信号的非线性混沌特性

对测井信号的特征提取采用非线性分析方法。利用非平稳信号分析方法——游程检验法,分析松辽盆地某井储集层测井数据的非平稳特性;在此基础上,采用非线性混沌方法对测井数据进行最大Lyapunov指数提取。结果表明:储集层测井序列具有非平稳特性;最大的Lyapunov指数大于零,表明了储集层测井序列具有混沌特征。为此,储集层测井信息的提取可采用非线性混沌理论方法,以便更有效地描述测井信息特征。