西格二线关角隧道施工控制网复测方法及分析

本文结合青藏铁路西格段增建二线的重点工程关角隧道施工控制网复测,浅述施工控制网复测的施测方法、数据处理及分析方法,为关角隧道的施工控制网提供了较为准确的验证方法。     

GPS在隧道测量中的应用研究

全球卫星定位系统（GPS）的全面建成和发展,导致了导航和测绘行业的一场深刻的技术革命。GPS用途相当广泛：军事、气象、地震、水利、农林、测绘等等,在大地测量、城市控制网建市,改造方面应用较多。这些控制网在选点布网,观测以及数据后处理等方面已日趋完善,而GPS在隧道控制测量中的应用已越来越多。     

浅谈GPS技术在隧道施工控制网中的应用

在高海拔区域布设施工控制网时,通过选点埋石、GPS测量、水准测量、平差计算及坐标系建立等一系列工作中采取一定措施,确保测区坐标系统的独立性和投影长度变形值小于2.5cm/km的规范要求。本文以拉脊山隧道施工控制网的布设、施测为例简要介绍施测全过程及注意事项。     

富水砂卵石地层大直径盾构近距离穿越地铁既有隧道变形控制方法及规律研究

针对砂卵石地层大直径盾构近距下穿既有地铁运营隧道施工工程中的沉降变形问题,提出了有效控制既有地铁隧道沉降变形的既有线超前加固措施及盾构穿越期间的施工控制方法。结合既有线地铁隧道自动化变形监测系统获取的实时监测数据,重点分析了盾构掘进进度对既有线运营隧道造成的沉降变形规律。总结的施工控制方法、自动化监测方法以及得到的变形规律,可为类似盾构穿越既有线施工项目的既有线沉降变形控制提供参考。     

GPS RTK在道路控制测量中的应用

目前的GPS控制测量基本上采用相对定位的测量方法。这就需要多台GPS接收机在相同的时间段内同时连续跟踪相同的卫星组,实施同步观测。同步观测时各GPS点组成的图形称为同步图形。在控制测量中,用GPS建立控制网,最精密的方法当属静态测量。对大型建筑物,如特大桥、隧道、互通式立交等进行控制,宜用静态测量。而一般公路工程的控制测量,则可采用RTK动态测量。这种方法在测量过程中能实时获得定位精度。当达到要求的点位精度,即可停止观测,提高了作业效率。     

建立省级GPS-C级网的意义和作用

分析了原有大地控制网存在的问题和科研生产中对大地控制网的要求 ,阐述了采用GPS建立全省C级控制网的意义和作用。     

对某城市测量控制网的分析和扩展研究

本文通过某市城区已有测量控制网的分析,提出了该城区测量控制网的改建发展方案,对提出的各方案进行了详细的分析和比较,并对该城市区测量控制网的发展进行了规划,对该市测量控制网的改建发展和开展地籍测量工作具有指导意义,同时对其他中小城市测量控制网的改建与布设有一定的参改价值。     

潍坊市C级GPS控制网、三等水准网通过省专家组验收

近日，由国家测绘局第二大地测量队施测的潍坊C级GPS控制网、三等水准网顺利通过了省国土资源厅组织的专家组验收。为了保证质量，提高精度，加强测绘成果汇交和保密管理，由国家测绘局第二大地测量队对潍坊、烟台、威海3市C级GPS控制网整体设计、整体施测，采用高科技全球卫星定位系统测量技术，建设全方位的C级GPS基础控制网和三等水准网，形成精度统一、分布均匀、高等级的空间定位基础控制网，为构建数字潍坊地理空间框架奠定了大地控制基础。专家验收组对技术总结、工作报告、仪器检定、自检报告等测绘成果进行了全面检查后，一致同意“潍坊市c级GPS控制网、三等水准网”项目通过验收。     

广州市GPS控制网的设计特色和技术突破

通过对广州市GPS控制网的精心设计,科学实施,解决了当前应用GPS控制测量中较多且较难的技术问题,并达到了良好的效果.广州市GPS控制网的设计采用先进规范、分级布网、混连式网形等特色及基线文件的统一转换、方差协方差阵的平衡、超大网平差、多坐标系统的平差等技术突破和达到的实际效果,对大型控制网布测具有一定的指导作用.     

GPS在本溪县三维控制网建设中的应用

正随着国民经济的发展,我国土地开发和资源勘测逐步深入,GPS技术在建立控制网方面独特的优势使得它迅速被人们认识和接受,并成为城市开发控制网建设的重要手段。GPS三维控制网的建立可以为城市和地区测绘各种大比例尺地形图和进行城市各种高精度的工程测量、市政测量、地籍测量、管线调查测量、矿山储量测量和建立城市地理信息系统提供城市基础测绘资料和控制数据保障。城市控制网的精度选择取决于控制网的具体用途。而网形设计取决于城市地形和接收机数量。本     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Relationship of Arctic sea ice and Northern Hemispheric 500 hPa Polar vortices

Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated.     

Author Index for Journal of Mountain Science Volume 11,2014,pp 1-1656

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Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research