Distribution and prediction of dimethyl sulfur sea-air flux in south Australian          下载免费PDF全文

Jiang Limei  Qu Bo 《极地研究》1988,31(1):45

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抚顺煤田开采诱发的地质灾害现状及防治对策     

李兰 《国土资源》1991,(4)

抚顺煤田开采诱发的地质灾害有5种主要形态类型:露天开采导致的边坡变形;煤田采空区地面沉陷;煤震;采煤剥离物自燃对环境的污染和采煤剥离物对地下水的污染。研究上述地质灾害的分布状况、灾害程度以及发生机制,可为预防和治理地质灾害提供依据。  相似文献   

可控源音频大地电磁法(CSAMT)的近场效应和近场校正     

周茂军  周玉冰 《国土资源》1993,(3)

本文简单地介绍了可控源音频大地电磁法(CSAMT)的近场效应和近场校正方法,利用CSAMT的正演计算说明了推覆体下找煤的可能性。并以淮北某煤田为例,说明现有近场校正方法在推覆体下找煤的应用效果。  相似文献   

BOOK REVIEWS     

《The Professional geographer》1987,39(4):487-521

Book Reviewed in this article: Geographical Aspects of Health and Disease in India . Rais Akhtar and A.T.A. Learmonth , eds . Antarctic Treaty System: An Assessment . Proceedings of a Workshop at Beardmore South Field Camp, Antarctica. American Electoral Mosaics . J. Clark Archer and Fred M. Shelley . Kompas op Suidwes-Afrika/Namibie . W.S. Barnard , ed . Jerusalem in the 19th Century: The Old City . Yehoshua Ben -Arieh . The World as a Total System . Kenneth E. Boulding . A Social History of Housing 1815–1985, Second Ed . John Burnett . Human Migration . W.A.V. Clark . Regional Population Projection Models . Andrei Rogers . The State of Population Theory: Forward from Malthus . David Coleman and Roger Schofield , eds . Imagining Tomorrow: History, Technology and the American Future . Joseph C. Corn , ed. Swidden Agriculture in Indonesia: The Subsistence Strategies of the Kalimantan Kantú . Michael R. Dove . Glacial Geologic Processes . David Drewry . Physics of Desertification . Farouk El -Baz and M.H.A. Hassan , eds . Housing the Homeless . Jon Erickson and Charles Wilhelm , eds . Settlement Patterns in Missouri: A Study of Population Origins, with a Wall Map . Russel L. Gerlach . Desert Development: Man and Technology in Sparselands . Yehuda Gradus , ed . Nuclear Winter. The Evidence and Risks . Owen Greene , Ian Percival and Irene Ridge . The Take-off of Suburbia and the Crisis of the Central City . Günter Heinritz and Elisabeth Lichtenberger , eds . Regional Input-Output Analysis . Geoffrey J. D. Hewings . Spatial Transportation Modeling . Christian Werner . The Atlas of Georgia . Thomas W. Hodler and Howard A. Schretter , eds . Latin America. 5th ed . Preston E. James and C.W. Minkel . Applied Remote Sensing . C.P. Lo . Localities, Class, and Gender . The Lancaster Regionalism Group . Urban Social Movements: The City after Castells . Stuart Lowe . Politics and Method . Doreen Massey and Richard Meegan , eds . Land Use . A. S. Mather . The Kingdom of Coal . Donald L. Miller and Richard E. Sharpless . The Presidio and Militia on the Northern Frontier of New Spain, A Documentary History, Vol. 1: 1570–1700 . Thomas H. Naylor and Charles W. Polzer , S.J., comps . and eds . Nuclear Power: Siting and Safety . Stan Openshaw . The Central African Republic: The Continent's Hidden Heart . Thomas O'Toole . Environmental and Dynamic Geomorphology . Márton Pécsi , ed . Remote Sensing Principles and Interpretation . Floyd F. Sabins , Jr . Acid Rain and Friendly Neighbors: The Policy Dispute between Canada and the United States . Jurgen Schmandt and Hilliard Roderick , eds . Earth's Changing Surface: An Introduction to Geomorphology . M.J. Selby . International Migration: The Female Experience . Rita J. Simon and Caroline B. Brettell , eds . On Geography and Its History . D.R. Stoddart . Transportation Networks: A Quantitative Approach . D. Teodorovic . Processes in Physical Geography . R.D. Thompson , A.M. Mannion , C.W. Mitchell , M. Parry , J.R.G. Townshend . Imaging Radar for Resources Surveys . J.W. Trevett . Dominance and Affection: The Making of Pets . Yi -Fu Tuan . Capturing the Horizon. The Historical Geography of Transportation since the Transportation Revolution of the Sixteenth Century . James E. Vance , Jr . Nations at Risk: The Impact of the Computer Revolution . Edward Yourdon .  相似文献   

城市地籍测量中GPS技术的应用研究     

赵根庄  马旭霞  满树徐  吕从 《国土资源信息化》2005,(6):26-28,15

GPS新技术的出现,可以高精度地测定地物点的坐标。特别是应用RTK新技术,依据一定数量的基准控制点,便可以高精度并快速地测定界址点及地物点的坐标。本文尝试利用GPS技术在城市地籍测量方面的应用做一些探讨。  相似文献   

极端异常气象资料的综合性质量控制与分析   总被引：24，自引：1，他引：24       下载免费PDF全文

任芝花  刘小宁  杨文霞 《气象学报》2005,63(4):526-533

在传统的气象资料质量控制技术中,通常利用统计方法设置控制界限,对于界限以外的资料作为可疑值被标注或作为错误值而被剔除。文中以中国1971~2000年700多基准基本站中,气温极端事件———青海托托河站1985年10月~1986年3月的极端异常月平均气温为例,介绍了极端异常气象资料的综合性质量控制方法。通过综合性质量控制与分析,即参考Metadata、邻近站检验、不同观测项目间的一致性检查,均证明托托河站1985年10月~1986年3月极端异常月平均气温资料是正确的。从而说明,利用界限控制检查出的所谓错误资料,虽然在统计学意义上很难出现,但是它有可能反映了异常极端的天气气候事件,是正确的。因此,对于极端异常的气象资料,应进一步通过综合性质量控制,分析该资料正确与否,从而保留极端天气气候事件的事实。文中最后介绍了中国1971~2000年700多基准基本站极端异常月平均气温资料的综合性质量检查结果。  相似文献   

车辆导航系统实现中的关键技术     

WANG Yong-hong  XIE Yun-hong 《测绘学院学报》2007,(Z1)

主要介绍了一个基于PDA的在Windows CE上实现的嵌入式GIS,它可以实时的为移动对象提供基于地理空间位置的综合信息服务。首先介绍了车载导航系统中系统数据的组织方式,主要涉及到数据模型和数据压缩;然后讲述了几种常用的嵌入式操作系统:VxWorks、Windows CE和Linux,由于嵌入式Linux开发难度较大,VxWorks比较昂贵,本系统采用Windows CE作为嵌入式操作系统;最后讲述了系统实现中的关键技术,包括提高地图显示和刷新速度的几种处理技术和系统中采用的地图匹配算法。  相似文献   

福建省山区高速公路工程施工控制网设计方案研究     

林修锬 《现代测绘》2007,30(1):22-23

从福建省山区高速公路工程施工现状出发,分析了导线最弱点点位中误差的影响因素,导出了在山区进行控制测量时,影响导线最弱点中误差的主要因素是导线边数,从而提出了一种既经济适用又满足精度要求的设计方案.  相似文献   

地图合并的技术研究     

刘春雷  王爱国  肖仁杰 《现代测绘》2007,30(3):13-15

本文探讨了地图合并技术的研究内容、研究范畴、一般流程;讨论了地图合并的概念、方法;论述了地图合并的主要内容;重点综述了地图合并的相关算法.这些问题的研究丰富完善了地图合并技术的基本理论体系.  相似文献   

A computational scaling analysis of multiobjective evolutionary algorithms in long-term groundwater monitoring applications     

J.B. Kollat  P.M. Reed 《Advances in water resources》2007

This study contributes a detailed assessment of how increasing problem sizes (measured in terms of the number of decision variables being considered) impacts the computational complexity of using multiple objective evolutionary algorithms (MOEAs) to solve long-term groundwater monitoring (LTM) applications. The epsilon-dominance non-dominated sorted genetic algorithm II (ε-NSGAII), which has been shown to be an efficient and reliable MOEA, was chosen for the computational scaling study. Four design objectives were chosen for the analysis: (i) sampling cost, (ii) contaminant concentration estimation error, (iii) local uncertainty, and (iv) contaminant mass estimation error. The true Pareto-optimal solution set was generated for 18–25 well LTM test cases in order to provide for rigorous algorithm performance assessment for problems of increasing size. Results of the study indicate that the ε-NSGAII exhibits quadratic computational scaling with increasing LTM problem size. However, if the user is willing to accept an approximation to the Pareto-optimal solution set, ε-dominance can be used to reduce the computational scaling of MOEAs to be linear with increasing problem sizes. This study provides a basis for advancing the size and scope of water resources problems that can be effectively solved using MOEAs.  相似文献