Provenance and Paleogeography of the Late Cretaceous Mengyejing Formation,Simao Basin,Southeastern Tibetan Plateau

正The Mengyejing potash salt deposit(MPSD)is the only pre-Quaternary potash salt deposit in China.The MPSD is located in the southern Simao Basin,southeastern Tibetan Plateau.The MPSD,along with rock salts and clastic rocks,     

一种大文件多版本遥感影像数据组织管理方法

近年来,遥感技术的飞速发展使得影像数据的使用也越来越广泛和深入,而影像分辨率的增加,使得数据量急剧增长,对数据的存储和管理提出了很高的要求。针对传统遥感影像数据组织存储的不足,本文提出了一种大文件金字塔数据存储结构,用来高效存储管理影像数据;同时针对多时相遥感影像数据,提出了基于版本机制的影像数据管理模式。实验表明这种方法具有更高的存储检索效率。     

The lower limit of the Doppler factor for a Fermi blazar sample

We selected 457 blazars(193 flat spectrum radio quasars, 61 lowsynchrotron peaked blazars, 69 intermediate-synchrotron peaked blazars and 134high-synchrotron peaked blazars) from the second Fermi-LAT catalog(2FGL) of γ-ray sources, which have X-ray observations. We calculated the lower limits for their Doppler factors, δγ, and compared the lower limits with the available Doppler factors and the apparent superluminal velocities in the literature.     

Analysis of A Porous and Flexible Cylinder in Waves

The hydrodynamic response of a porous flexible circular-cylinder in regular waves was analytically studied. To simplify the problem, the cover and the bottom of the cylinder were ignored. Small amplitude water wave theory and structural responses were assumed. The velocity potentials were solved using the Fourier-Bessel series expansion method and the least squares approximation method. The convergence of the series was numerically tested to determine the number of terms in the series expansion. Two types of installations were considered for deformation, hydrodynamic forces, structural flexibility, drafts, and porosity. The present study represented a preliminary step in the study of the fish cage.     

Southern high latitude climate anomalies associated with the Indian Ocean dipole mode

1 INTRODUCTION In southern high latitudes, recent observations have shown a standing mode of ACW (Antarctic Circumpolar Wave) with eastward propagation across the Southern Ocean of the Antarctic in co- varying SST (sea surface temperature) and SLP (sea le…     

芝罘群岩石地层划分及区域对比

芝罘群分布于烟台市区北部芝罘岛、崆峒岛、担子岛等岛屿上,自下而上划分为老爷山组、兵营组及东口组.东口组为新建岩石地层单位.该群岩石组合为白云母钾长片麻岩、含电气石钾长石英岩、钾长石英岩、镜铁矿钾长石英岩、石英岩、白云母石英片岩夹黑云片岩、透辉变粒岩及大理岩等.其原岩为富钾、铁、硼的长英质碎屑岩夹粘土岩及富镁碳酸盐岩.兵营组单颗粒锆石U-Pb年龄为2171Ma,其成岩时代属古元古代早期.芝罘群区域上可与辽东地区古元古代榆树砬子群对比.     

论地质旅游资源

地质旅游资源是自然旅游资源的核心,以成因、物质基础、空间分布为基础,结合其形态特征、社会经济特征等因素对地质旅游资源进行了初步分类,并探讨了地质旅游的特色及发展前景.     

基于ArcEngine的ArcGIS与AutoCAD数据转换研究

空间数据的交互和共享成为GIS中比较受关注的问题。介绍如何通过ArcEngine来实现ArcGIS与AutoCAD在不同的存储机制上图形数据交互共享的方法。     

GPS RTK技术在地籍测量中的应用

以沈阳市规划和国土资源局2005～2006年的地籍测量工程为例,阐述GPS RTK技术应用于地籍测量过程中的参考站位置选择、流动站作业环境要求、数据链设置、外业施测及作业精度控制、转换参数的残差检验和测量精度检验。     

基于GIS技术的莱州湾东岸河流分形研究

应用地理信息系统(GIS)技术提取了莱州湾东岸河流信息,在此基础上运用计盒方法对莱州湾东岸的黄水河和王河水系进行了分形分析,获得了两水系的主河道河长分维数和河网分维数,并以此探讨了分维数与流域地貌和地质构造之间的相互关系。分形分析为研究区流域地貌学与水文学研究提供了一种新的研究途经。