Design and Strength Analysis of A Spherical Connector for Lifting Subsystem in Deep Sea Mining System

1 .IntroductionThe lifting systemis composed of pipes andtheir connectors .It is not onlythe lifting channel formanganese nodule betweenthe miningship andintermediate bin,but alsothe supporting massfor deepsea miningequipment and cables .Sothe reliability…     

城市控制网改造中的关键问题

本文结合成都市控制网改造的实例,较为详细地阐述了城市控制网改造中的基准转换、长度变形、CORS系统和似大地水准面精化等关键问题及其解决方案,从而为大中城市控制网的建设提供参考。     

基于Intergraph GIS的基础空间数据库一体化建设研究

阐述了基于Intergraph GIS的城市基础空间数据的结构和建库的内容,提出了一体化的建库、质量控制、空间数据动态更新以及基于版本信息的历史数据存储与恢复的方法,介绍了一体化建库实例。     

1∶5万地图数据库的计算机综合缩编

针对国家空间数据基础设施建设的需求,讨论了实用化地图综合软件的开发与应用,从软件开发角度讨论了地图综合系统功能的层次化划分及在软件中的圈层式结构组织,地图综合操作环境的建立,综合规则的形式化表达,综合算子的设计与软件实现。结合1∶1万到1∶5万数字地图综合及更新的应用实例,提出了多尺度空间数据库建立的技术路线。     

利用卫星影像和航空影像更新基础地理信息方法研究

基础地理信息的更新,是保证地理信息系统现势性的充要条件.卫星遥感影像数据具有周期短、信息丰富、现势性强等特征.利用卫星影像数据来更新基础地理信息数据是一种行之有效的方法.如何利用遥感数据融合技术,将多传感器获取的各种影像数据中所含的信息优势有机地结合起来,更是成为目前研究的热点.利用航空影像和Landsat多光谱波段影像进行数据融合,能够有效地提高影像空间分辨率,以获取更高质量的信息.     

Seismic data compression based on integer wavelet transform

Introduction With the development of the seismological observation technique and deep-going of seismicdata application fields, especially the digitization of data in earthquake station networks, theimprovement of the precision, the data quantity increases as geometric order, which bringdifficulty to saving and transfering these data. To keep all information, seismic data, like medicalimages, should be compressed without error in many applications. In generally, traditionalcompression meth…     

冲积层防水煤柱上提工作面的防治水对策

开滦矿区煤系地层上覆由于防水煤柱留设过大，造成了大量的煤炭储量呆滞。为了提高煤炭资源回收率，确保安全生产，开滦林南仓矿在西二采区进行了工作面采后的导高观测试验研究，测量导水裂隙带岩层的漏失情况，为提高开采上限提供了地质依据，防水煤柱由原来的65m缩小到53m，成功地在1221上工作面进行了试验开采。     

Optimizing a layered and laterally constrained 2D inversion of resistivity data using Broyden's update and 1D derivatives

Dense profile-oriented resistivity data allows for 2D and 3D inversions. However, huge amounts of data make it practically impossible to do full 2D or 3D inversions on a routine basis. Therefore, a number of approximations have been suggested over the years to speed up computations. We suggest using a combination of Broyden's update on the Jacobian matrix with derivatives calculated using a 1D formulation on a parameterized 2D model of locally 1D layered models. The approximations bring down the effective number of 2D forward responses to a minimum, which again gives us the ability to invert very large sections. Broyden's update is not as useful with a parameterized problem as is the case with a smooth minimum structure problem that has been the usual application. 1D derivatives, however, seem to be very effective when initiating a full 2D solution with Broyden's update. We compare the different methods using two different kinds of data on two synthetic models and on two field examples. The most effective and reliable optimization combines 1D derivatives with a full 2D solution and Broyden's update. When using Broyden's update the Jacobian matrix needs to be reset every once in a while. We do this whenever the difference in data residual from the previous iteration is less than 5%. This combined inversion method reduces the computation time approximately a factor of 3 without losing model resolution.     

面向矿床三维动态建模的地质勘探数据库增量更新方法

针对深部找矿过程中地质勘探数据增加和动态三维地质建模需要,提出了一种基于版本管理的矿床地质勘探数据库增量更新方法。在分析矿床地质勘探工程数据与三维地质模型映射关系的基础上,建立时序版本和建模版本作为矿床勘探数据增量更新版本标识。针对矿床地质勘探数据库增量更新的版本管理,提出了一种扩展的有向无环图版本管理模型,设计了基于关系数据库的版本管理方法并探讨了其实现过程。以安徽铜陵凤凰山矿床地质勘探数据为例,基于SQL Server数据库系统建立了实例矿床地质勘探版本数据库,以C#编程实现了实例矿床勘探数据库的版本管理,包括版本的建立、查询与显示等功能,通过勘探工程增量更新版本数据建立了三维矿体的动态修正模型,证实了方法的可行性与有效性。