重庆雾的二维非定常数值模拟

重庆是著名的“雾都”.本文建立了一个复杂地形下详细考虑长波辐射冷却、地表热量平衡、雾水沉降、水汽凝结和蒸发、湍流交换系数等的二维非定常雾模式,以实测资料为初始场,研究了一次重庆雾的形成和发展过程.对江河、热岛、辐射、地形和山城的影响,模式分别进行了数值试验.     

浅议中国滨海城市旅游形象塑造原则

从城市旅游形象的形成因素出发,分析滨海城市塑造旅游形象的依据,初步探讨了我国滨海城市旅游形象塑造原则,主题性原则、独特性原则、针对性原则、系统性原则等。     

Characteristics of post-socialist urban transformation in East Central Europe

The development of the post-socialist city has already been characterised by substantial restructuring processes. Particular emphasis should be drawn to the take-off of the tertiary sector and the comprehensive blight phenomena in the previously industrial areas. The urban housing sector has witnessed increasing housing affordability problems, a marginalisation of communal housing stock, an increase of segregation and an intensification of the decay in the old housing stock. In all East Central European states the spatial development processes of industry and services within the cities basically show clear parallels to the pattern of urban development in continental Europe. In Hungary housing policy, tenure structure and the level of segregation already show relatively closer similarities to the neoliberal, Anglo–American pattern of development. The other ECE states show closer similarities to the corporatist welfare states of continental Europe. As far as medium-term urban development in East Central Europe is concerned, it is to be assumed that – regardless of the specific path of further development – overall solutions shall not be found for the fundamental problems which are the legacy of the socialist era – the decay of old housing stock, large scale derelict industrial areas and the extent and deficiencies of high-rise housing estates. This revised version was published online in July 2006 with corrections to the Cover Date.     

Network Topology and City Accessibility of the Commercial Internet

The rapid growth in this decade of World Wide Web access through the Internet is supported by a complex matrix of telecommunications infrastructure. This paper presents an overview of the history of the Internet and recent efforts to measure its structure and performance, and examines the spatial organization of the commercial Internet backbone. The research presented in this paper differs from previous Internet measurement work in that we apply network analysis methods to evaluate Internet connectivity. Transportation network analysis techniques are applied to measure 1) connectivity of individual service provider networks and 2) accessibility of cities to Internet service. The results reveal many different strategies implemented by service providers in network design as well as large differences in levels of accessibility of cities and regions in the United States. There is also an apparent disparity between population and city accessibility to the Internet.     

莱芜市征地拆迁的实践与探索

莱芜市国土资源局市区分局征地拆迁过程中,严格规范征地拆迁程序,及时按要求进行安置补偿,并建立了征地拆迁矛盾纠纷排查调处机制。但仍存在失地农民的社会保障制度不完善、土地级差收益和征地补偿价格差异大、地面附着物补偿标准不全面而且偏低、被征地农民安置欠缺等问题。根据莱芜市工作现状进行调研分析,并对今后工作开展进行了探讨,提出加大征地拆迁政策宣传力度,积极探索和改进土地征用补偿方式,实行留地政策,拓宽失地农民安置途径等建议。     

福建龙岩万安稀土矿床地质特征及成因探讨

万安稀土矿产于华力西-印支期似斑状中粗粒黑云母二长花岗岩和燕山早期第三次侵入细粒花岗岩风化壳中,矿体形态、产状受风化壳和地形控制,呈面型分布。主矿体规模大,成矿物质来源与花岗岩有关,属风化壳离子吸附型稀土矿床。     

聊城西部地热田地热流体特征及开发利用

聊城西部地热田位于山东省莘县凹陷的南部区内,属C1-Na型地下热水。其中锶达到了命名矿水浓度,碘化物、偏硅酸达到了矿水浓度,偏硼酸达到了有医疗价值浓度。地热水中还含有铁、锰、锂等多种对人体有益的微量元素。该区地热井出水量大,出水温度高,具有极大的开发利用前景。     

山区城市环境系统的污染及其变异的典型研究

本文以重庆市为代表，讨论山区城市环境系统中大气、地表水、土壤、地下水、包气带、生物体等六个子系统的污染状况，并研究了由此而引发的环境系统的变异，它涉及到气候变迁，土壤酸化，物种退化，水质恶化，建筑物表面和文物的损害，人群和生物生存的潜在变化等诸多方面，为制定防治污染策略提供科学依据。     

内蒙古临河市城市土壤环境地球化学特征

通过对内蒙古临河市区土壤、浮尘中元素地球化学特征的研究分析,表明在临河市区的表层土壤与浮尘中均存在Cd、Pb、Hg、Cu、Cr等重金属元素异常,而在深层土壤中上述元素呈背景值分布。在浮尘中各重金属元素含量明显高出对应表层土壤中元素含量,这些元素在浮尘中含量是土壤中的1.39~4.12倍。这些异常元素的来源包括燃煤产生、汽车尾气排放以及其他工业活动的排放。Pb、Cd是临河市区浮尘和土壤中的主要重金属异常元素,是主要的影响因子。Cu含量在临河市区明显高出河套平原,在浮尘中Cu含量明显高出土壤的,可能与Cu制品在城市区使用较多有关。作为一个主要以轻工业为主的城市,临河市区的重金属含量要明显低于其他大城市,但也存在元素的异常区,说明人类活动对城市区环境产生了严重影响。     

眉山市地质灾害现状及防治对策

眉山市地质灾害主要类型有滑坡、崩塌和不稳定斜坡。通过对全市地质灾害隐患点的考察和最新地质灾害信息分析,阐述了全市地质灾害隐患点的主要类型及特征,归纳了地质灾害分布特征;对全市地质灾害隐患点发育的主要影响因素进行了较为系统的分析,认识了眉山市地质灾害的成因机制。在此基础上,进一步提出了地质灾害防治原则和防治对策。