Comparison of dissolved and particulate arsenic distributions in shallow aquifers of Chakdaha, India, and Araihazar, Bangladesh

Background  

The origin of the spatial variability of dissolved As concentrations in shallow aquifers of the Bengal Basin remains poorly understood. To address this, we compare here transects of simultaneously-collected groundwater and aquifer solids perpendicular to the banks of the Hooghly River in Chakdaha, India, and the Old Brahmaputra River in Araihazar, Bangladesh.     

GPS应用于建筑物变形观测的探讨与展望

随着全球定位技术的不断发展,GPS在工程建设领域的应用也越来越广泛。主要介绍GPS在三维定位方面的优点,并讨论其代替精密水准测量(沉降观测)及传统的水平位移监测的可能性。     

大冶铁矿国家矿山公园规划实践

大冶铁矿的开发利用在为我国的钢铁事业作出巨大贡献的同时,也给矿区的地表环境、森林资源带来了很大的破坏。矿山公园的规划实施可极大地改善矿山环境,为矿山的可持续发展提供较好的途径。     

大别山的变质碰撞混杂岩——以东部为例

大别山是中国东部中朝大陆板块与扬子大陆板块之间的碰撞造山带。具有薄皮构造的性质。组成两个碰撞大陆之间的滑脱（冲断剪切）带的岩石就是碰撞混杂岩组合。大别山由于剥露较深,仰冲壳楔完全被剥蚀,超高压变质带大面积出露,识别出碰撞混杂岩组合是对大别山进行几何分析的必要步骤。大别山碰撞混杂岩组合可分为南北两部分。北部为条带状片麻岩-超镁铁岩组合,南部为云母斜长片麻岩-榴辉岩组合,这两个组合的大部分都经历过超高压变质作用。它们的共同特点是具有宏观的＂碎斑结构＂和混杂作用。罗田穹隆是造山过程中早期形成的双冲式背斜,最后在造山晚期因东西向缩短的叠加而形成穹隆。     

数字摄影测量相机在航空摄影测量及大比例尺数字化成图中的应用

分析了数字摄影测量相机(DMC)在航空摄影测量及大比例尺数字化成图中遇到的问题,如摄影比例尺的选择;数字解析空中三角测量野外像控点间航向基线数、旁向航线数、区域网总航线数的确定;摄影测量平台软件的选择;对计算机硬件的要求;摄影精度、加密精度、成图精度等.     

Multiple Volcanic Episodes of Flood Basalts Caused by Underplating

Most Large igneous provinces (LIPs) are emplaced within <10 Ma, with a main pulse of the magmatism in<1 Ma[1]. For example, the Siberian Traps [2] and the Deccan Traps [3] were probably erupted within one million years. Many events, such as the Columbia River event, feature a single pulse of magmatism, followed by a protrac-ted period of magmatism at a much lower rate that is linked to a plume tail[4].