刍论大连湾底质地化环境

本文根据1987年的调查资料,总结阐述了大连湾底质地化环境诸要素的分布规律及其特征,运用相关分析法,通过多元回归计算求得了诸要素之间的关系。经过综合因素分析,得出了大连湾氧化还原环境分区、还原环境的成因及发展趋势。     

An Electronic Chart Display and Information System

This article introduces the most advanced form of electronic chart display and information systems (ECDIS) which complies with the performance standards for ECDIS established by the International Maritime Organization (IMO) and International Hydrographic Organization (IHO). It also describes the key features and the important functions of ECDIS, which we developed. This system is different from the productions developed by C-map, Seven-cs, offshore, and others. It is more suitable for China Marine Safety Administration Bureau to manage the navigation marks real-time. Using this system charts were located and accessed rapidly, and displayed smoothly. This article also discusses in ECDIS application system how to dynamically access and desert charts data in a limited memory (limited computer memory and resource). We constructed a tridimensional structure to manage a large amount of charts data. Vertically, according to the scale range, all charts were divided into eight levels, and a data structure called as “Multiple Scale Quad-tree” was constructed. And horizontally, a grid (every unit has a fixed size) was given to a certain scale level. We call this data structure a “Regular Page.” We explore the implementation of such a structure on the worldwide charts management utilizing quad-trees. Then we discuss the future development of ECDIS and its application system in marine agencies in China.     

曲靖盆地生物气成藏条件及主控因素分析

曲靖盆地新近系茨营组第三段的晚期生物气藏是新近系沉积之后,喜山运动时期各种成藏条件有效的时空配置的结果.在讨论曲靖盆地构造和沉积演化的基础上,综合分析了生物气源、储集层和盖层、圈闭形成以及天然气输导等成藏条件,阐述了生物气晚期聚集成藏条件的时空匹配关系.指出自第四纪以来,生物气源岩持续高效的产气作用是生物气成藏的物质保障,气藏的形成是生物气连续的补充大于逸散动态平衡的产物;背斜构造、砂岩上倾尖灭和砂岩透镜体圈闭是该区主要的圈闭类型;断裂和不整合面是沟通生物气源岩到圈闭的垂向和侧向输导通道,茨营组的连通砂岩体是生物气近距离运移的输导层.蔡家冲组大套湖相暗色泥岩的生物产气效率、断裂的垂向输导能力和圈闭的保存条件及其在时空上的动态配置是生物气晚期成藏的主控因素.     

PKI数字证书在WEB系统中的安全应用

本文主要对加密和身份认证技术进行了简要分析,并就如何利用证书解决WEB应用中 的信息对传输的保密性、完整性和不可否认性以及用户身份认证问题提出了安全解决 方案。     

加强科学管理是“九五”重点项目顺利实施的重要保障

本文对辽宁省防震减灾“九五”重点项目实施过程中采取的管理体制及管理措施进行了介绍。在管理体制上 ,建立了较为完善的组织机制构 ,按照全省地震系统一盘棋的指导思想 ,把市地震局作为一级管理机构 ,由市地震局负责本地区项目的实施与组织管理工作 ;在项目管理中 ,采取了跟踪检查、抓样板示范、抓项目施工质量、抓创新、抓技术培训等行之有效的措施 ,为“九五”重点项目的顺利完成并取得较好成绩提供了保证     

数字城市规划系统关键技术分析

分析了数字城市规划系统的业务需求，介绍了其基础数据更新、工作流、无纸化办公、历史空间信息管理等主要关键技术，并对其进行了讨论。     

2002年6～7月安阳市连续性高温天气过程分析

利用1970～2000年安阳市高温天气资料和实时资料，分析了安阳市2000年6～7月两次区域性连续高温天气的天气形势、地面要素特征、地形影响及高温天气变化周期，揭示了高温天气的成因，找出了预报着眼点。     

影响广西的孟湾风暴

统计分析了1973年以来影响广西的孟湾风暴天气气候情况及环流特征,总结出该类天气演变的一般规律及预报着眼点,为提高天气预报准确率提供有益参考。     

Science and the desertification debate

Desertification is an environmental issue that has major environmental and social dimensions, and which has been controversial in a number of respects. The recent UN Convention on Desertification and Drought places considerable emphasis on the social dimensions of the problem and the role local peoples and NGOs have to play in tackling it. When desertification first became regarded as a major issue in the 1970s, science was seen to have a major role in understanding and solving the problem, but in some circles has been regarded as failing to contribute usefully. This paper explores the nature of scientific contributions, why science may have been seen to fail to serve the needs of policy-makers, and why scientific findings may have been misinterpreted in broader circles dealing with the issue. It concludes by identifying areas where science has still a valuable role to play in an issue that is now perhaps regarded as more political and social than scientific.