基于角色和任务的访问控制在工作流管理系统中的应用

工作流管理系统（WfMS）是一个应用于企业的业务自动化管理系统,需要一个很好的访问控制机制来进行管理控制。基于工作流管理系统中复杂的权限管理这一安全需求,将基于角色和任务的访问控制机制应用于工作流管理中,使WfMS中的访问控制以任务为中心,达到动态管理的目的,同时由于角色的存在而简化了授权操作的复杂性。最后,给出了实现系统访问控制模块的主要功能类。     

混合访问控制模型在测绘应用系统中的应用

本文在分析测绘系统开发与应用中测绘数据的复杂性,以及大部分测绘系统都包含业务流程等特点的基础上,除了RBAC模型的角色授权外,加入了任务对操作进行授权,对RBAC模型进行了有效的扩展,使其更具通用性。该方法有效解决了传统的RBAC模型在测绘系统应用中存在的弊端,对其他应用系统建设同样具有理论指导。     

Modeling the Roles of Precipitation Increasing in Glacier Systems Responding to Climate Warming —— Taking Xinjiang Glaciated Region as Example

The studies on prediction of climate in Xinjiang almost show that the precipitation would increase in the coming 50 years, although there were surely some uncertainties in precipitation predictions. On the basis of the structure of glacier system and nature of equilibrium line altitude at steady state （ELAo）, a functional model of the glacier system responding to climate changes was established, and it simultaneously involved the rising of summer mean temperature and increasing of mean precipitation. The results from the functional model under the climatic scenarios with temperature increasing rates of 0.01, 0.03 and 0.05 K/year indicated that the precipitation increasing would play an evident role in glacier system responding to climate change： if temperature become 1 ℃ higher, the precipitation would be increased by 10%, which can slow down the glaciers retreating rate in the area by 4 %, accelerate runoff increasing rate by 8 % and depress the ELAo rising gradient by 24 m in northern Xinjiang glacier system where semi-continental glaciers dominate, while it has corresponding values of only 1%, 5 % and 18m respectively in southern Xinjiang glacier system, where extremely continental glaciers dominate.     

Re-visiting large historical earthquakes in the Colombian Eastern Cordillera

A re-assessment of the historic seismicity of the central sector of the Colombian Eastern Cordillera (EC) is made by revision of bibliographic sources, by calibration with modern instrumental earthquakes, and by interpretations in terms of current knowledge of the tectonics and seismicity of the region. Throughout the process we have derived an equation to estimate M_w for shallow crustal earthquakes in Colombia using the length of isoseismal VIII, L_VIII:

海泡石应用于调湿材料的研究

为寻找合适的湿度调节材料,本文对海泡石及海泡石复合样品进行了吸湿能力和放湿能力测试。与坡缕石比较,10g200目海泡石样品可以将10L密闭容器的湿度从70%降至4%,吸湿能力强于同样条件下的坡缕石。海泡石(10g)的吸、放湿能力经过3次吸、放湿实验后有所减弱,最后一次吸湿量达0.4g,放湿量达0.15g。实验还发现,30g海泡石和白水泥复合样品可以使10L容器内部的湿度稳定在40%～50%,因此,海泡石可以用作室内湿度调节的建筑材料。     

试论平果三水铝石成因、富集规律及工业价值

平果岩溶堆积型铝土矿系一水硬铝石铝土矿床 ,原矿中含有大量的准胶结物———红土。研究资料证实 ,红土中的三水铝石含量甚高 ,不少地段已达到工业利用的要求。其他矿物质来源于原生沉积铝土矿床 ,并与堆积矿同产于一个层位。     

BOOK REVIEWS

Book Reviewed in this article: Main Street: Northeastern Oregon: The Founding and Development of Small Towns . Barbara Ruth Bailey . Food Politics: The Regional Conflict . David N. Balaam and Michael J. Carey , eds. The International Economy and Industrial Development: Trade and Investment in the Third World . R. Ballance , J. Ansari and H. Singer . Neighborhoods in Urban America . Ronald H. Bayor , ed. The English Heartland . By Robert Beckinsale and Monica Beckinsale . Regional Dimensions of Industrial Policy . Michael E. Bell and Paul S. Lande , eds. Tension Areas of the World . D. Gordon Bennett , ed. Latin America: an Introductory Survey . B. W. Blouet and O. M. Blouet , eds. Integration and Division: Geographical Perspectives on the Northern Ireland Problem . Frederick W. Boal and J. Neville H. Douglas , eds. Energy and Land Use . Robert W. Burchell and David Listokin , eds. Slopes and Weathering . Michael Clarke and John Small . Alaska's Rural Development . Peter G. Cornwall and Gerald Mc Beath , eds. The Politics of Park Design: A History of Urban Parks in America . Galen Cranz . World Congress on Land Policy, 1980, Proceedings . Matthew Cullen and Sharon Woolery , eds. Oregon Divided: A Regional Geography . Samuel N. Dicken and Emily F. Dicken . Urban Food Marketing and Third World Rural Development . T. Scarlett Epstein . South Africa: Spatial Frameworks for Development . T. J. D. Fair . Institutions and Geographical Patterns . Robin Flowerdew , ed. Industrialization of U.S. Agriculture, An Interpretive Atlas . Howard F. Gregor . Planning Theory: Prospects for the 1980s . Patsy Healy , Glen Mc Dougall and Michael J. Thomas , eds. Neighborhood Mobilization: Redevelopment and Response . Jeffrey R. Henig . The American Urban System: A Geographical Perspective . R. J. Johnston . Climate, History and the Modern World . Hubert H. Lamb . Climate and History: Studies in Past Climates and Their Impact on Man . T. M. L. Wigley , M. J. Ingram and G. Farmer . China: Railways and Agricultural Development, 1875–1935 . Ernest P. Liang . A Desirable Energy Future—A National Perspective . Robert S. Livingston , T. D. Anderson , T. M. Besmann , M. Olszewski , A. M. Perry , and C. D. West . Topothesia: Essays Presented to T. S. Ó Máille . B. S. Mac Aodha , ed. Transportation for the Poor: Research in Rural Mobility . Hal S. Maggied . Land Uses in American Cities . Harold M. Mayer and Charles R. Haves . Industrial Organisation and Location . Philip Mc Dermott and Michael Taylor . Human Adaptability: an Introduction to Ecological Anthropology . Emilio F. Moran . Regional Analysis and the New International Division of Labor . Frank Moulaert and Patricia W. Salinas , eds. The Nuclear War Atlas. Victoriaville, Quebec, Canada : Urbanization and Environmental Quality . Isao Orishimo . The Garden of Eden: The Botanic Garden and the Re-Creation of Paradise . John Prest . Earthfire, The Eruption of Mount St. Helens . Charles Rosenfeld and Robert Cooke . Contest for the South China Sea . Marwyn S. Samuels . The Future of the Wetlands: Assessing Visual-Cultural Values . Richard C. Smardon , ed. Tucson: the Life and Times of An American City. C. L. Sonnichsen . The Geography of Multinationals . Michael Taylor and Nigel Thrift , eds. Impact of Marine Pollution on Society . Virginia Tippie and Dana Kester . Reviving the Industrial City: the Politics of Urban Renewal in Lyon and Birmingham . Jerry A. Webman . Andean Reflections: Letters from Carl O. Sauer While on a South American Trip under a Grant from the Rockefeller Foundation, 1942 . Robert C. West , ed. Cartographic Drawing with Computers . P. Yoeli .     

地下共同沟的开发利用与立法

当该地人均GDP达到1000美元时就可以进行地下空间的开发利用。我国的很多城市人均GDP早已突破了1000美元,并且争相进行地铁、地下商场、地下综合体的开发。但是,共同沟的发展仍然很缓慢,这与共同沟自身的特点有关：共同沟自身建造成本问题、盈利问题等一系列问题制约了共同沟的发展。所以共同沟的发展需要政府的支持,需要法律的支持。本文通过对国内外共同沟的建造历史、共同沟的优缺点、政府及法律方面的分析。来阐述共同沟的建造及立法的重要性。     

边疆省域旅游流的网络结构及影响因素

旅游景区是旅游业发展的关键,分析边疆省域旅游网络结构,识别网络中的景区角色,可凸显景区空间功能,促进边疆地区旅游业高效发展。研究基于在线预定数据,利用模块化分析、景区角色识别模型和最优尺度回归方法,对典型边疆省域云南省内126家旅游景区进行网络结构及影响因素分析。结果表明：①云南省旅游流网络呈现6个群集模块,模块在旅游流网络中地位由其主要角色决定,目的地内景区模块化趋势明显,形成“三核心、多轴线”的模式;②旅游景区识别为核心景区、重要景区、普通景区及边缘景区4种角色, 高等级景区核心枢纽地位突出,具有显著的集聚扩散效应,重要景区与核心景区联系紧密,普通和边缘景区集中在滇东南部,联系疏散;③边疆省域内民族性强、海拔高、差异大、资源禀赋高的景区客流量大。研究结果可为云南省加强全域旅游建设、推动旅游产业布局及景区角色定位、品质升级方面提供一定参考。     

论找矿突破中的科技引领作用

从当前找矿工作的难度和需求、科技引领找矿突破的重要性、科技创新在实现找矿突破过程中的作用和地位、科技引领工作的主要任务,以及创新科技引领找矿突破工作机制等几个方面论述了找矿突破工作的科技引领作用,以期对推进找矿突破战略行动有所裨益.