史料考证与找矿(之四)：个旧锡矿

著名的个旧锡矿，据史料在元廿七年（1290年），率先在老厂矿区银铜矿开始采银（铅）-锌矿。清康熙四十六年（1707年），始由官方主持大规模开发砂锡矿，直至民国初年（1910年）都以采-冶砂锡为主，元廿七年后，银硐，黄茅山，竹林山，龙树脚等老硐深部，相继发现并转入原生锡矿开采。个旧300余年的采-选-冶开发史，使当地矿工在识别砂锡，脉锡不同矿石类型（荒），涮碗目测品位，水力采矿（冲荒尖），水力洗选（溜口），土法炼锡，锡锭表面“花口”识别等诸多领域，创造出一套完整的采-选-冶工艺，在中国矿业史上作出重大贡献。     

Visual Basic及Excel在水文频率计算中的应用研究

水文频率计算是工程水文计算中的重要环节之一，而皮尔逊Ⅲ型水文频率曲线在工程水文中应用最为广泛。经验频率计算和参数估计是确定设计值的核心，通过分析提出了用计算机实现频率计算、绘制成果图表的方法。并在满足国家标准和规范的前提下，利用Visual Basic开发工具和Excel模块，研制了相应的软件，用以解决频率计算中的数据输入输出、参数计算、交互适线、成果合成、图表输出等问题。     

利用Matlab和Visual C++实现卡尔曼滤波的新方法

阐述了Matlab与Visual C++的优缺点,提出了一种利用Matlab和Visual C++实现卡尔曼滤波的新方法.利用Matlab的Add-in插件可快速将M文件集成到C++中,创建独立的C/C++程序.通过实例介绍在Visual C++ 6.0环境下如何实现Matlab与Visual C++的混合编程.     

Assessment of visual interpretation of thematic mapper (TM) images for land use and cover in Sudan

Three thematic mapper (TM) images, a band 3 image, a band 4 image and a 432 colour composite image of Khartoum were compared for detection, identification and recognition of land use and cover classes in hydrology in Sudan. Simple visual interpretational techniques were employed for this purpose. The results show that visual interpretation procedures can be very useful for an inventory of hydrologic land use and cover using Landsat TM photographic products. This is an important conclusion for developing countries where digital techniques are very expensive at the present and many developing countries cannot afford to make use of them.     

基于地理信息可视化的线状符号表达方法的研究

本文根据线状要素地理信息表达的需要，对线状符号进行了分类．在分析了线状符号的视觉变量之后，给出了其图案单元的数据结构。最后结合线状符号的分解、组合特性提出了线状符号的配置方法。     

An evaluation of visual and measurement-based methods for estimating deposited fine sediment

A wide range of methods are commonly used to measure deposited fine sediment and quantify substrate quality in rivers as part of bioassessment or monitoring programmes. In this laboratory-based experi-ment known amounts of three sediment types (sand, topsoil, peat) were added to mesocosms and four methods of measuring deposited fine sediment;turbidity, estimation of released sediment, Turner–Hillis deposited sediment sampler (DSS) and visual estimation of%surface cover were evaluated. The objective of the study was to evaluate which of these methods for estimating deposited sediment best dis-criminates between levels of deposited fine sediment added and assesses the effects of inter-observer variability between % surface cover estimations. While turbidity measurement and the resuspension method were strongly related to levels of added sediment, it proved difficult using the two methods to resolve differences between adjacent levels of added sediment e.g. 50 g and 100 g. Surface cover esti-mations were also strongly related to added sediment levels and were better able to distinguish between adjacent levels of added sediment. Furthermore, we found no significant differences between the %surface cover estimations between observers. Results from this laboratory experiment strongly endorse the use of visual estimation of surface cover in field studies. Further work evaluating the turbidity and re-suspension methods under field conditions would also be beneficial.     

多波束回声测深系统测量数据的分离提取方法

通过对Em系列多波束测深系统原始数据结构分析,提出了从原始测量数据中提取各种测量数据的技术方法,并编程实现了该方法。该技术方法对多波束测量数据的分析处理有重要的意义。     

计算机辅助编制第四系剖面图的程序设计

利用MAPGIS提供的外部数据接口，采用Visual Foxpro6.0数据库管理及开发系统，开发了基于Windows环境下的计算机辅助编制第四系剖面图绘图系统，该绘图系统成功地应用于多件地质报告编制中，取得了极好的效果，为利用计算机辅助编制水文地质图件提供了有效的途径。     

TIMER控件在试题库系统中的应用

用Visual Basic 6.0的定时器控件,给不同的用户设置随机的初始密码,并把用户和密码一起保存在数据库中.     

海底地形及其变化可视模型的研究

本文介绍了黄海海底辐射沙洲与潮汐通道的可视模型以及建模的方法。根据该海区３年的测量数据，通过分形内插，生成连续多年时／空水深数据序列。然后建立一组反映海底地形及其变化的数学模型。在此基础上，通过可视化处理，形成该区１９６８至２０００年海底地形及其变化的多种可视模型。