深空网及其应用   总被引：4，自引：2，他引：4  

刘经南  魏二虎  黄劲松 《武汉大学学报(信息科学版)》2004,29(7):565-569

阐述了深空网的概念、主要任务、发展简史、主要构成和关键技术手段 ,概括总结了深空网在天文观测和空间探测中的意义及应用过程 ,展望了深空网的发展前景。  相似文献   

Geodatabase数据模型在配电设备管理中的应用   总被引：2，自引：0，他引：2  

宋雪丽  邵永社李晶 《测绘学院学报》2004,21(2):131-133

首先简要介绍了Geodatabase数据模型；然后设计了Geodatabase配电网数据模型，并着重配电网中拓扑分析问题的处理；最后，利用一个简单设备介绍了Geodatabase数据模型中“复杂”节点的创建。  相似文献   

GIS数据库自动更新机制研究   总被引：2，自引：0，他引：2  

王少华  边馥苓 《武汉大学学报(信息科学版)》2004,29(12):1059-1062

阐述了B S和C S混合架构的GIS系统中两种不同架构之间的基于数据层的交互、数据库的自动检查更新以及数据更新上存在的问题和难点 ,提出了一种有效的数据库自动更新机制 ,同时在实践中加以验证 ,取得了良好的效果。  相似文献   

Mathematical modelling of historical reconnaissance CORONA KH-4B Imagery   总被引：1，自引：0，他引：1  

Hong-Gyoo Sohn  Gi-Hong Kim  Jae-Hong Yom 《The Photogrammetric Record》2004,19(105):51-66

This paper describes three mathematical modelling methods for high-resolution declassified CORONA KH-4B images. Since CORONA images are collected with a panoramic camera, several types of geometric distortions are involved. Two methods use the modified collinearity equations, and the third involves the terrain-dependent rational function model (RFM) which is considered to be a generic sensor model. Comparative analysis of the three mathematical modelling methods is undertaken. The results show that a ± 1·5 pixels level of horizontal and vertical accuracy can be obtained. A digital elevation model (DEM) of a test site is also created.  相似文献   

Travel time of accreted igneous assemblages in western Pacific orogenic belts and their associated sedimentary rocks     

Costas Xenophontos  Soichi Osozawa   《Tectonophysics》2004,393(1-4):241

Accreted igneous assemblages in orogenic belts maybe divided into three types depending on whether they derive from seamounts, ocean ridges or subduction-related ophiolites. Seamount type basalts are associated with shallow water sediments—mostly reefoidal limestones. Ocean ridge type basalts are generally overlain by pelagic cherts. Subduction-related ophiolitic eruptives, often underlain by gabbroic and ultramafic rocks, are associated with hemipelagic mudstones. The age of such diverse eruptive lithologic assemblages reflects the time taken for them to have traveled from their locus of generation to their place of accretion at a continental margin. This relationship has been established for each type of accretionary complex, examples being taken mostly from Japan and the western Pacific rim in order to represent evolutionary processes at a typical active plate margin. In general, the seamount types are older, ridge types are of intermediate age, and the ophiolitic types are by far the youngest, usually close to zero age. Seamount type basalts are accreted by shallower scraping of the seamount's sediment apron together with fragments of seamount basalt, ridge type, by peeling due to permeability contrast, and the ophiolitic types by deeper scraping as a consequence of an inflected temperature gradient. Accordingly, it is concluded that the ophiolitic rocks are generated close to the trench and may be accreted as a result of ridge subduction.  相似文献   

Estimating tectonic history through basin simulation-enhanced seismic inversion: geoinfomatics for sedimentary basins     

Kush Tandon †  Kagan Tuncay  Kyle Hubbard  John Comer  Peter Ortoleva 《Geophysical Journal International》2004,156(1):129-139

  相似文献   

云南鸡街碱性超基性岩杂岩体中橄榄石的化学成分分带现象     

吴静  黄智龙  A.McCaig  E.Condliffe  颜以彬 《矿物学报》2004,24(1):7-13

云南鸡街碱性超基性岩杂岩体的主体岩石为岩浆结晶分异作用的产物，形成顺序为霞霓钠辉岩→霓霞岩→磷霞岩。在杂岩体的霓霞岩中发现了1粒具分带现象的橄榄石，从中心到边缘，SiO2、MgO和NiO逐渐降低，而FeO和MnO逐渐升高。MgO与SiO2和NiO之间呈正相关关系，与FeO和MnO之间呈负相关关系，中心的Fo值(最高为86．91)略高于霞霓钠辉岩中斑晶橄榄石(Fo值：85．66～86．02)，而边缘的Fo值(最低为73．82)与霓霞岩中无分带现象橄榄石(Fo值：72．18～74．72)相近。各种证据表明，发现的具分带现象橄榄石可能不是霓霞岩熔体结晶分异作用的产物，而可能是霓霞岩熔体捕获的Fo值相对较高(高于霓霞岩橄榄石的Fo值)的橄榄石晶体内部MgO和FeO等成分扩散作用的结果。  相似文献   

粘土对丙烯基复合吸水树脂性能的影响研究   总被引：6，自引：0，他引：6  

刘永兵  蒲万芬  周明  胡琴 《矿物岩石地球化学通报》2004,23(3):203-206

以丙烯酰胺(AM)、丙NN(AA)为原料，以不同粒径的粘士(MMT)为无机填料采用水溶液聚合法合成了复合吸水树脂，讨论了MMT对其吸水性、保水性、韧性、抗温性、抗盐性的影响及其影响机理。结果表明，MMT的粒径越小，吸水树脂吸水倍率越低，韧性、抗盐性、抗温性等性能就越好；可通过调整MMT粒径来提高树脂的综合性能。  相似文献   

Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling     

LI Shuguang  HOU Zhenhui  YANG Yongcheng  SUN Weidong  )  ZHANG Guowei  & LI Qiuli . School of Earth  Space Sciences  University of Science  Technology of China  Hefei  China  . Regional Geological Survey Team of Shaanxi Province  Xianyang  China  . Department of Geology  Northwest University  Xi抋n  China 《中国科学D辑(英文版)》2004,(4)

~~Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling1)Present address:Max-Planck-Institut f..Chemie,Postfach3060,55020Mainz,Germany.~~  相似文献   

甘肃红石山地区蛇绿混杂岩地质特征   总被引：13，自引：6，他引：13  

魏志军  黄增保  金霞  孙永君  火军昌 《西北地质》2004,37(2):13-18

红石山蛇绿混杂岩产出于塔里木板块北缘红石山深大断裂带中。其物质组成反映出该杂岩形成于小洋盆环境。时代为早石炭世晚期，后经历了至少3期构造变形变质作用的叠加与改造。于二叠纪晚期运移至地表。作者进一步论述了红石山蛇绿岩的组成及变形变质特征，为研究北山北带提供了最新资料。  相似文献