港口环境镉和铅的迁移行为研究及模型的建立

港口矿产品堆场的重金属溶出作为港口土壤、水体的重要污染源不容忽视。本文在天津港口7个有代表性的矿产品堆场采集土壤和水体样品,确定重金属的污染状况;应用微宇宙系统模拟Cd和Pb在港口沉积物和水体生态系统中的迁移行为,通过建立多介质逸度模型对微宇宙系统的模拟情况进行拟合,探索Cd和Pb在沉积物和水体中的归趋和迁移规律。现场采样分析表明,矿产品堆场重金属污染较为严重,其中Cd污染显著,超过国家土壤三级标准。微宇宙系统试验表明,Cd的污染状况分析与现场采样分析结果一致;沉降是Cd和Pb在水环境中主要的迁移过程,在试验时长216 h内,Cd大约有61%保留在沉积物中,倾向于停留在水相中,容易通过水体的平流和扩散扩大污染范围,而Pb有99%保留在沉积物中,更容易吸附在悬浮物表面而向沉积物相沉积。研究表明,露天堆放的矿产品的影响是显著的,应尽可能采用集装箱堆放方式,减少矿石直接与雨水接触的机会,封闭污染通道,降低环境效应。     

Linguistic mechanism of hypermedia structure in multimedia electronic atlas

With hypermedia technology the structure of a publication can be re-arranged to accommodate more easy cognition of the idea and concept by linking the concepts which are represented by different media forms into an integrated concept. Essentially, multimedia electronic atlas is a kind of electronic publication, which has many common characters with ordinary CD-ROM publications. For the deeper exploration of electronic atlas it is very important to understand the internal and general structure of the new media structure. The aim of this paper is to discuss the internal structure of multimedia electronic atlas as a whole by applying the methodology of linguistics.     

SuperMap三维专题信息展示系统的设计与实现

专题地图主要由地理基础和专题内容组成,地理基础作为编制专题内容的骨架,表示专题内容的地理位置及与地理环境的关系。传统的专题信息主要以二维专题地图的形式展现,依靠GIS的制图表达和空间分析能力来展示与专题内容相关的信息。基于三维空间的专题信息展示,除了集成影像、地形、矢量、模型等基础地理数据,还可以借助地理空间位置丰富专题业务数据,表达社会化多媒体信息。同时借助三维空间展示效果,以时间轴的形式反映空间范围内的信息动态变化。本文探讨了借助三维GIS,融合地理基础信息及社会媒体信息,形成多维尺度的信息展现方式,有序直观的反映整个专题的内容,丰富专题信息的表达效果。     

Multimedia and Internet Business Clusters in Central Tokyo

This paper discusses the concentration of multimedia and Internet businesses in Central Tokyo. The multimedia businesses producing various digitized materials and the other businesses related to the Internet can be identified as a business domain referred to as "the multimedia and Internet industry." Tokyo is the location of the largest concentration of multimedia and Internet businesses in Japan. Several industrial clusters of such businesses can be identified in Central Tokyo through the locational analysis of the firms utilizing GIS techniques. Among these clusters, Kanda, the largest one with its tradition of IT related technical and publishing/printing businesses, contains a number of software design and application service firms. In contrast, Shibuya, the second largest cluster without any pre-existing industrial tradition, specializes in multimedia and Web content business. Shibuya, which is popularly called "Bit Valley," has grown rapidly correspondence with the expansion of the demand for multimedia and Web content products on the bases of its denser industrial relations compared to those in the other clusters and of few disadvantages in the competition for human resources for creative workers employment due to a distinct local labor market.     

GIS原理教学中的问题与初步思考

地理信息系统(GIS)原理是GIS专业或其相关专业的专业基础或必修(限选)课，对GIS人才培养具有非常重要的作用，但由于种种原因，GIS原理在教学方面仍存在多方面的问题与不足。本文首先分析了大学本科GIS原理在教学内容、实验与实习及教学手段等方面存在的问题，然后针对这些问题根据自己的教学体会提出了一些相应的解决办法与建议。     

基于TeleAtlas3.0的城市多媒体电子地图的设计与制作

作者基于多媒体电子地图制作软件TeleAtlas3 0 ,结合《武汉数码路路通》多媒体电子地图的设计与制作 ,总结出城市多媒体电子地图集设计与实现的基本思路。在概述了多媒体电子地图集的发展现状以及城市多媒体电子地图集的功能后 ,简要地介绍了多媒体电子地图集的开发环境 ,详细地描述了城市多媒体电子地图集的设计与制作过程 ,并以《武汉数码路路通》的设计与制作为实例进行了分析     

基于空间数据库的多媒体图形查询信息系统研究——以苏州河环境综合整治为例

本文介绍作者自行开发的GIS软件系统———基于空间数据库的多媒体图形查询信息系统的内容、结构和功能 ,以及在环境规划管理方面的应用。阐明了系统可满足决策管理层和公共信息发布层等不同层次的应用需求 ,对环境工程项目的规划管理可作为示范和借鉴。说明本系统除具有一般GIS系统所具有的功能外 ,还把现代多媒体技术和GIS空间数据库技术结合起来 ,实现了在空间数据基础上的多媒体信息查询 ,丰富了GIS中属性数据查询的内容 ,提高了地图的可视性。详细介绍了一种地理信息系统的空间分析方法———包含分析的算法和在本系统中的具体应用———按多边形区域进行空间相关性关系查询。     

Abstract of ph.d Dissertation

With the rapid development of global information highway,multimedia communication technology plays a more and more important role in national economic and social development.However,the multimedia communication system is a complicated real time distributed system and its software is difficult to develop.In order to improve the rapid development and application of the multimedia communication technology,there is an urgent need to carry out the basic research work of software development platform in this field.……     

The Organization of Multimedia Information in electronic Map

On the basis of an electronic map-based hypermedia data model (EMBHDM),this paper makes a study on the technologies of nonlinear storage,organization,management and browsing of information,management and browing of information as well as organization of data on the basis of the relationship between multimedia information of electronic maps. This paper first analyzes some features of electronic maps and hypermedia technologty,and then illustrates the creation of EMBHDM with some examples.The tests show that this model can efficiently organize and express multimedia data.