基于多基站网络的VRS差分改正信息的方法分析

基于虚拟参考站VRS(Virtual Reference Stations)的GPS测量技术是近几年应用在网络RTK中的热门技术,文中首先介绍VRS的基本原理,然后利用站际星际二次差分技术,推导虚拟观测值,最后讨论研究虚拟参考站的双差改正数的内插算法。     

四川眉山芒硝矿主要环境地质问题与防治对策

眉山市芒硝矿开采和生产过程中的主要环境地质问题是矿区地下水和地表水疏干、污染及矿区土壤污染等,影响了矿山及附近居民的生产生活,威胁了人民的身体健康。本文在芒硝矿山环境地质问题调查的基础上,针对存在的主要问题,提出了防治措施。     

Solar-type stars in Cepheus OB 2: Hα emission stars and IRAS point sources

A survey for emission line stars was carried out in 1980 with the Schmidt telescope of Konkoly Observatory in the region of IC 1396 (Kun, 1986a, hereafter referred to as Paper I). This work was aimed at a preliminary mapping of the probable medium mass members of the association Cepheus OB 2. The stars of the region have been followed since then with the same telescope in order to obtain a more complete view on the stellar content of this giant star-forming region. The common variability of the H emission strength makes the sense of repeating such surveys. The new survey resulted in the discovery of 65 further emission stars. Equatorial coordinates and finding charts are given for them.PhotographicBVRI photometry was carried out for all known emission stars of the field. The colourmagnitude and two-colour diagrams derived from theB, V, R, andI magnitudes show that these stars are probably F-G-type (1.5M <M<3M ), partly pre-Main-Sequence members of Cep OB 2, whereas a few of them may be distant red giants.The youngest objects of the region can be found among the IRAS point sources. Their properties are discussed on the basis of IRAS data alone.     

图像数据挖掘软件原型系统的设计与开发

提出了图像数据挖掘软件原型系统的设计与开发的试验框架,阐述了其设计与开发方法,介绍了各个模块的功能、设计与开发情况。     

测绘专业美术基础教育的研究

广义地阐述艺术教育在高等学校理工科专业教育中的普遍意义,重点论述对测绘学科各专业学生进行艺术素质培养的必要性和紧迫性,并介绍在建立美术基础教育体系的探索中取得的成果.     

基于MAPGIS的1∶50万土地利用数据库系统设计与实现

土地利用资料是国家重要的基础地理资料 .针对全国土地利用数据进行建库管理会对国家建设起到重要的作用 .以MAPGIS为基础 ,按照一定的设计原则提出系统总体上应有的数据编辑、查询、统计等六大模块及其主要的功能 .详细说明了在MAPGIS平台的支持下全国土地利用数据库的数据组织方式 ,以及外部属性与图形数据的关联方式、图库中图元的B+ 树索引的结构、数据检索、输出流程等关键技术问题的解决方案 .     

遗传算法在边坡数值计算中的应用

改进了进化方向的遗传算法与有限元数值法，结合并研制了相应的软件。应用该软件对多类型岩土边坡进行弹性模量、内聚力、内摩擦角等参数反演分析，显示误差很小，收敛速度也很快，这说明改进进化方向遗传算法这种新型的优化算法在多类型岩土参数优化估计中具有独特的优势。     

Imaging magnetic sources using Euler's equation

The conventional Euler deconvolution method has the advantage of being independent of magnetization parameters in locating magnetic sources and estimating their corresponding depths. However, this method has the disadvantage that a suitable structural index must be chosen, which may cause spatial diffusion of the Euler solutions and bias in the estimation of depths to the magnetic sources. This problem becomes more serious when interfering anomalies exist. The interpretation of the Euler depth solutions is effectively related to the model adopted, and different models may have different structural indices. Therefore, I suggest a combined inversion for the structural index and the source location from the Euler deconvolution, by using only the derivatives of the magnetic anomalies. This approach considerably reduces the diffusion problem of the location and depth solutions. Consequently, by averaging the clustered solutions satisfying a given criterion for the solutions, we can image the depths and attributes (or types) of the causative magnetic sources. Magnetic anomalies acquired offshore northern Taiwan are used to test the applicability of the proposed method.     

CT图像存档与管理解决方案

本文针对数字影像设备（如CT、MRI等）日益突出的图像存储和管理问题，进行深入的分析和研究。鉴于不同厂家和时期设备配置不同，提出了4种切实可行的解决方案：胶片扫描，视频采集，光盘或MOD输入，DICOM接口连接，完全解决了图像长期大量存储的问题。同时具有网络联机查询，图文报告，电子病历管理，激光相机接口等丰富的增值功能，是数字化医院的理想选择。