南极长城站潮汐观测与分析

从1987年1月5日开始,在南极长城站使用挪威安德拉公司生产的WLR—5型水位计对潮汐进行长期自动观测,取得60天,共8千多组数据。本文对这些实测资料进行了分析,初步得出南极长城站潮汐变化的一些基本特征。     

Arctic glacier movement monitoring with GPS method on 2005

During the 2005 Arctic Yellow River Station expedition, the research on monitoring the movement and mass balance of two glaciers around Ny-Alesund, Austrelovenbreen and Pedersenbreen, which were selected in the 2004 Yellow River Station expedition were conducted. This paper analyzes the feasibility and advantage in using GPS method to monitor the Arctic glaciers＇movement, estimates the precision of first time measured GPS data and discusses the relevant problems in surveying on the Arctic Glaciers with GPS.     

Stability analysis on Jinjia dam hydropower project in Chongqing City

The stability analysis is one of the chief problems at hydropower stations.The Jinjia Hydropower Station is a significant project in Southwest China.The paper adopts the rigidity limited equilibrium theory and evaluated stability of the slope body,which will provide the evidences for further detail design.     

HUMAN SPACEFLIGHT: ACHIEVEMENTS, BENEFITS AND FUTURE OPPORTUNITIES FROM A EUROPEAN PERSPECTIVE

The past achievements, benefits and future opportunities of human spaceflight are discussed from a European perspective. Earlier work performed on the Skylab, Salyut, Shuttle, Spacelab, and Mir orbital facilities is reviewed, together with the prospects for new research on the International Space Station (ISS). Major scientific benefits are expected from the ISS in the areas of life science research (including human physiology and medicine) physical sciences, and fundamental physics.     

GPS/VRS实时网络改正数生成算法研究

为提高厘米级网络GPS/VRS实时动态定位的精度和可靠性,系统地探讨VRS网络实时改正数的生成模型,并提出适用于中长距离参考站网络的电离层、对流层以及卫星轨道改正数计算的改进算法。结合四川GPS参考站网络(SGRSN)以及自主开发的虚拟参考站软件平台VENUS系统,对上述改正数生成算法进行试验验证,结果表明其大气误差改正数精度为2~4 cm,轨道误差的影响可基本消除,满足80 km以上中长距离稀疏参考站网络厘米级实时动态定位服务要求。     

关于在中国构建全球导航卫星国家级连续运行站系统的思考

全球导航卫星连续运行站系统可以维持相应地区的高精度、3维、地心、动态坐标框架,提供集约化的定位和导航服务,成为当前国际和国内发展迅速的一项基础设施建设。该系统可以广泛服务于国家大地基准、气象、地球动力学、地学灾害监测以及位置服务等领域。对在中国构建全球导航卫星国家级连续运行站系统提出了方案,并从建设目的、建设原则以及建设方案等方面进行了讨论。     

青藏高原东部的Pn波层析成像研究

利用INDEPTH/ASCENT台阵和其它布设在青藏高原的流动宽频带地震仪数据,反演了青藏高原东部和周边区域的上地幔顶层Pn波速度以及台站延迟.研究区域的平均Pn波速度是8.1 km/s,略高于中国大陆的平均Pn波速度.低速区主要分布在羌塘地块的西部和松潘-甘孜地块,高温异常的岩石圈上地幔很可能是导致这一低速区的原因.班公-怒江缝合带东端区域的Pn波速度达到8.35 km/s,这一高速区可能与向北俯冲的印度板块(东端)有关.另一Pn波高速区分布在祁连山和昆仑山之间,主要由柴达木盆地和共和盆地及其周边地区,两个并不完全连续的高速异常区组成,它可能对应于特提斯洋闭合时北部增生的克拉通地体;在后来的欧亚板块与印度板块的碰撞中,这一地体有可能阻挡了青藏高原向北的生长.相对密集的台站提供了高分辨率的速度结构横向分布和地壳厚度变化.台站延迟显示青藏高原北部和东部的地壳存在显著的减薄--松潘-甘孜地块东北缘的地壳厚度仅为约50 km,而羌塘地块东部唐古拉山地壳最厚,达到75 km,这可能是由于印度-欧亚板块碰撞引起的羌塘地块内部变形增厚所致.     

Performance assessment and optimization of seepage control system: A numerical case study for Kala underground powerhouse

The Kala Hydropower Station, planned in the middle reach of Yalong River in China, consists of a large-scale cavern system for water conveyance and power generation. The construction site is characteristic of difficult geological conditions and is rich in groundwater, and the control of groundwater flow in the surrounding rocks of the underground caverns becomes one of the key technological issues. This case study presents a systematic performance assessment of the seepage control system designed for the underground caverns by finite element numerical modeling, with particular concerns on geological characterization of the site and quantitative determination of the excavation-induced variation in hydraulic conductivity of the surrounding rock masses. The significant influence of the excavation-induced permeability variation on the seepage field in the surrounding rocks and the overall behaviors of the seepage control system are comprehensively illustrated by the numerical results, and the optimized design parameters are suggested for the drainage system. The methodology presented in this study is useful for understanding the performance of the seepage control system widely deployed in underground powerhouse engineering.     

基于像素工厂的常州市高分辨率正射影像图制作

对常州市高分辨率数字正射影像制作技术进行了探讨,给出了相应的技术流程,对所获取的成果进行了质量分析,结果表明：成果精度远高于1∶2000规范要求.最后给出了该技术体系所体现的技术特点,对同样地表特点的区域进行类似项目具有参考价值.     

阿图什市5.2级地震与于田6.2级地震前兆异常分析

利用阿克苏台网中心前兆观测数据,采用动态分析、形态法对新疆阿图什市Ms5.2地震和于田县Ms6.2地震进行系统分析.发现两次地震前,阿合奇台地倾斜资料、乌什台水管倾斜资料、伸缩仪资料、体应变及辅助测项钻孔水位和静水位数据、地电数据均出现明显的震前异常.其中水管仪、伸缩仪、体应变、地倾斜表现为打破年变,水管仪震前几天出现高频抖动、日变形态畸变;体应变辅助测项钻孔水位和静水位、地电震前表现为突变.