排序方式： 共有66条查询结果，搜索用时 31 毫秒
61.
用Delphi开发新疆地区棉铃虫测报数据库管理系统 总被引：5，自引：1，他引：4
以棉花三种害虫．棉叶螨、棉蚜、棉铃虫．测报的国家标准为基础,结合新疆地区棉花生产过程中这三种害虫发生的实际情况,建立新疆疆棉花害虫基数调查网络数据库,数据库包括：棉叶螨子数据库(3张数据表)、棉蚜子数据库(4张数据表)和棉铃虫子数据库(6张数据表)。基于局域环境构建了C／S结构的应用程序体系,实现了棉叶螨、棉蚜和棉铃虫基数调查的数据维护、查询、统计等功能。棉花害虫基数调查网络数据库的建立和C／S应用系统的实现,为棉花害虫区域化测报和管理提供厂强大的数据支持。 相似文献
62.
以辽宁省电子地图为基础数据,利用Borland Delphi为主要软件开发平台,基于COM技术的可编程OCX控件MapX开发了辽宁省新一代天气雷达拼图系统。该系统发挥了地图控件显示处理地理信息的优势和面向对象语言编程的灵活性,实现了新一代天气雷达拼图在电子地图上的"显示和缩放"、"漫游"和"图层控制"等功能。论述了雷达产品的坐标系转换原理、地图投影的选择、雷达重叠区域回波处理和栅格图像的配准以及MapX提供的数据绑定和临时图层生成方法,实现了雷达数据的地图加载。 相似文献
63.
信息化的不断发展,使气象预报的精确度越来越依赖更多更详细的自动站数据;目前全区有92个大监自动站和1200多个区域站的多种报类每半小时定时上传,如果遇到天气过程则是每10分钟加密上传,能否在国家局考核时效内迅速处理并上传单站合并数据,对于传输质量以及录入数据信息再利用起着至关重要的作用。为此,介绍的系统以delphi为编程平台,采用多线程技术使之能够多路同时并发快速处理单站数据,并取得良好的运行效果。 相似文献
64.
Comparison of Methods Used to Estimate Conventional Undiscovered Petroleum Resources: World Examples
Various methods for assessing undiscovered oil, natural gas, and natural gas liquid resources were compared in support of
the USGS World Petroleum Assessment 2000. Discovery process, linear fractal, parabolic fractal, engineering estimates, PETRIMES,
Delphi, and the USGS 2000 methods were compared. Three comparisons of these methods were made in: (1) the Neuquen Basin province,
Argentina (different assessors, same input data); (2) provinces in North Africa, Oman, and Yemen (same assessors, different
methods); and (3) the Arabian Peninsula, Arabian (Persian) Gulf, and North Sea (different assessors, different methods). A
fourth comparison (same assessors, same assessment methods but different geologic models), between results from structural
and stratigraphic assessment units in the North Sea used only the USGS 2000 method, and hence compared the type of assessment
unit rather than the method. In comparing methods, differences arise from inherent differences in assumptions regarding: (1)
the underlying distribution of the parent field population (all fields, discovered and undiscovered), (2) the population of
fields being estimated; that is, the entire parent distribution or the undiscovered resource distribution, (3) inclusion or
exclusion of large outlier fields; (4) inclusion or exclusion of field (reserve) growth, (5) deterministic or probabilistic
models, (6) data requirements, and (7) scale and time frame of the assessment. Discovery process, Delphi subjective consensus,
and the USGS 2000 method yield comparable results because similar procedures are employed. In mature areas such as the Neuquen
Basin province in Argentina, the linear and parabolic fractal and engineering methods were conservative compared to the other
five methods and relative to new reserve additions there since 1995. The PETRIMES method gave the most optimistic estimates
in the Neuquen Basin. In less mature areas, the linear fractal method yielded larger estimates relative to other methods.
A geologically based model, such as one using the total petroleum system approach, is preferred in that it combines the elements
of petroleum source, reservoir, trap and seal with the tectono-stratigraphic history of basin evolution with petroleum resource
potential. Care must be taken to demonstrate that homogeneous populations in terms of geology, geologic risk, exploration,
and discovery processes are used in the assessment process.
The USGS 2000 method (7th Approximation Model, EMC computational program) is robust; that is, it can be used in both mature
and immature areas, and provides comparable results when using different geologic models (e.g. stratigraphic or structural)
with differing amounts of subdivisions, assessment units, within the total petroleum system. 相似文献
65.
地籍管理是国土资源管理的核心,专业性强,数据量大,任务繁重。传统的管理方法已不能满足需求,而GIS及RDBMS的发展则为建立现代地籍管理系统提供了可能。本文阐述了地籍信息系统的总体构架,着重分析了Arc/Info、SQL Server及Delphi在建立地籍管理信息系统中的应用。 相似文献
66.