Seismic image quality beneath strongly scattering structures and implications for lower crustal imaging: numerical simulations     

Francesca Martini  Christopher J. Bean  Sean Dolan  David Marsan† 《Geophysical Journal International》2001,145(2):423-435

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The level of deterrence provided by data from the SPITS seismometer array to possible violations of the Comprehensive Test Ban in the Novaya Zemlya region   总被引：1，自引：0，他引：1  

David Bowers  Peter D. Marshall  Alan Douglas 《Geophysical Journal International》2001,146(2):425-438

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From Land Cover to Land Use: A Methodology for Efficient Land Use Mapping over Large Areas     

Josef Cihlar  Louisa J. M. Jansen 《The Professional geographer》2001,53(2):275-289

Land use information over large areas is increasingly important for many studies related to environment in general and global change in particular. Yet there is a dearth of methodological knowledge in this area, especially regarding the practical task of producing land use maps. In this article, a systematic land use mapping approach is developed, based on land cover maps that in turn are produced through remote sensing. The concept is based on the recognition of varying strengths of land cover (LC) – land use (LU) relationships, from the thematic and spatial points of view. Several categories of relationships are identified, ranging from direct (case 1) to multiple/complex (case 4), and appropriate mapping strategies are discussed for these cases. Using a mapping study in Lebanon, it is shown that the principles embodied in this approach correspond to issues and conditions in real mapping situations. Finally, the concepts are translated into a series of steps through which the method can be applied to large areas, taking into consideration the specific requirements and constraints of each case. The final land use map represents an acceptable compromise between accuracy, level of detail, and cost.  相似文献   

Book Reviews     

《The Professional geographer》2001,53(2):290-312

Pauline von Bornsdorff and Arto Haapala, eds. Aesthetics in the Human Environment James D. Proctor and David M. Smith, eds. Geography and Ethics: Journeys in a Moral Terrain G. Malcolm Lewis, ed. Cartographic Encounters: Perspectives on Native American Mapmaking and Map Use Richard Symanski, Blackhearts: Ecology in Outback Australia Donald W. Meinig, The Shaping of America: A Geographical Perspective on 500 Years of History Peter J. Taylor, Modernities: A Geohistorical Interpretation Keith Harries, Mapping Crime: Principle and Practice Leland T. Saito, Race and Politics: Asian Americans, Latinos, and Whites in a Los Angeles Suburb Frank McDonald, The Construction of Dublin Lisa M. Benton, The Presidio: From Army Post to National Park Bob R. O'Brien, Our National Parks and the Search for Sustainability Eric Damian Kelly and Barbara Becker Community Planning: An Introduction to the Comprehensive Plan Avinoam Meir As Nomadism Ends: The Israeli Bedouin of the Negev David Pinder, ed. The New Europe: Economy, Society, and Environment R. P. Misra and Kamlesh Misra Million Cities of India: Growth Dynamics, Internal Structure, Quality of Life, and Planning Perspectives. Vol 1  相似文献   

新集二矿下夹片地层特征及在防水煤柱留设中的意义     

张五兵 《中国煤田地质》2001,13(3):40-41

针对新集二矿新生界松散层，推覆体下开采的特殊地质及水文地质条件，通过对夹片地层水文工程地质条件，边界条件及富水性特征的分析，阐明夹片地层在防水煤柱留设中的意义，并通过生产实践验证，取得了较好的经济及技术效益。  相似文献   

塔里木盆地库车油气系统中、新生界的流体压力结构和油气成藏机制   总被引：29，自引：0，他引：29  

周兴熙 《地学前缘》2001,8(4):351-361

库车油气系统中、新生界流体压力纵向结构可分为台阶式、中凸式、均斜式 3种类型。平面分布可分两个带 3个区 :北带主要是台阶式压力结构分布区 ,南带的大部分是中凸式压力结构分布区 ,南带的南缘为均斜式压力结构分布区 ,构成不同类型的封存箱。这种压力结构分异主要是喜玛拉雅晚期 ( 5Ma)天山向南强烈推挤造成的 ;喜玛拉雅早期 ,整个油气系统压力结构大体是一致的 ,深浅层基本为正常压力 ,也即均为均斜式压力结构分布区。喜玛拉雅早、晚期的流体压力封存箱规模不等 ,油气运聚的环境不同 ,因而不同时期、不同地带具有各不相同的油气成藏机制。初步可概括为 3种机制和 3种成藏模式 :早期封存箱内成藏机制———牙哈模式 ;晚期封存箱内成藏机制———克拉苏模式 ;封存箱外成藏机制———大宛齐模式  相似文献   

我国西部地区矿产资源态势及黑色金属矿产勘查规划建议     

余中平  宋雄等 《地质与勘探》2001,37(4):32-35

我国是钢铁工业大国，解放以来黑色金属矿产勘查取得了举世瞩目的成就。当前，我国进行西部大开发，黑色金属矿产勘查要先行。我国西部地区富铁矿、富锰矿储量约占全国一半，铬矿储量占全国72．6％，加速西部地区黑色金属矿产勘查势在必行。在简述了我国黑色金属矿产勘查的必要性和可能性之后，提出了规划建议。  相似文献   

Investigating the ancient Martian magnetic field using microwaves   总被引：1，自引：0，他引：1  

John Shaw  Mimi J. Hill  Steven J. Openshaw 《Earth and Planetary Science Letters》2001,190(3-4):103-109

The new microwave palaeointensity technique has been used to investigate samples from the Martian meteorite Nakhla. This technique is a promising new way to obtain absolute palaeointensity information regarding the ancient Martian magnetic field as recorded by the Martian meteorites. Assuming that a part of the magnetic remanence is of thermal origin and originating on Mars the two samples studied yield estimates of 4 μT for the Martian magnetic field at 1.35 Ga.  相似文献   

低氟与大骨节病－－大骨节病防治拾趣四则     

李端生 《吉林地质》2001,20(2):72-79

该文笔者多年研究大骨节病原始原因的一项新说。即病区外环境低氟。引起体内以低氟为中心的代谢紊乱，从而导致以骨骼系统为主的病变－大骨节病。防治该病，应向体外补氟。药疗这一进补方式故然必然，但最有效又生活化的办法是食疗。食疗又分氟盐防治和饮茶防治两种。而最适用且简便的方法是提倡患区人群适度饮茶，并且应从儿时做起。关于补氟和饮茶等防治大骨节病的实践，笔者已浓缩于下面四则拾趣之中……。  相似文献   

钻孔压灌粉煤灰混凝土桩复合地基的应用研究     

李水清 《岩土力学》2001,22(4):519-521

通过工程实例，介绍了钻孔压灌粉煤灰混凝土桩的施工技术，说明了其施工工艺及特点，并利用6组静荷载试验成果，对粉煤灰混凝土桩复合地基的承载力特性进行了分析。  相似文献