对提高导航型GPS定位精度之工作方法的探讨

论文主要介绍了导航型GPS坐标转换参数的计算方法和测量误差的改正方法。该方法的要点是通过实测多个公共点来计算坐标转换参数,以此获得较好的转换精度;并进一步对观测结果加以误差改正,从而提高其定位精度。     

基于BP神经网络的地图数字化误差纠正

由于在数字化采集过程中不可避免地会引入系统误差和异常误差,因此消除和削弱这些误差的影响是提高空间数据质量的关键。然而由于图纸变形不均匀,扫描误差又极其复杂,用常规的多项式拟合技术只能消除部分有规律的系统误差,很难完全消除它们对地图数字化坐标的影响。BP神经网络是一个高度非线性映射系统,能以任意精度逼近。结合地图数字化坐标改正的特点,本文给出了基于BP神经网络地图数字化坐标误差纠正的方法,并通过实例验证了该方法的有效性。     

基于非等间距模型的建筑物沉降预测方法研究

该文基于实测资料进行建筑物沉降预测。在灰色模型和泊松曲线模型理论的基础上,引入对非等间距数列进行变换处理的方法,从而建立了非等间距预测模型。结合建筑物沉降监测资料进行分析比较,结果表明,两种预测方法均能较好地反映建筑物的沉降趋势。     

Monotone Regression and Correction for Order Relation Deviations in Indicator Kriging

The indicator kriging (IK) is one of the most efficient nonparametric methods in geo-statistics. The order relation problem in the conditional cumulative distribution values obtained by IK is the most severe drawback of it. The correction of order relation deviations is an essential and important part of IK approach. A monotone regression was proposed as a new correction method which could minimize the deviation from original quintiles value, although, ensuring all order relations.     

非开挖水平定向钻具（HDD）的分析与应用

本文介绍了水平定向钻杆（杆体材质R780）的机械性能;本公司开发的高钢级（G105或S135）水平定向钻杆的开发应用,分析其原理及使用价值。     

Mechanism of Secondary Pore Formation and Prediction of Favorable Reservoir of Paleogene in Jiyang Sag,Eastern China

Jiyang (济阳) sag is an oil rich basin,consisting of Huimin (惠民),Dongying (东营),Zhanhua (沾化),and Chezhen (车镇) depressions.The elastic rock of Paleogene has undergone early and middle diagenetic stages and now the main clastic reservoir is in the middle diagenetic stage.Primary and secondary pores are developed in Paleogene sandstone,the latter is generated from the dissolution of feldspar and calcite cement in rocks owing to the organic acid from the maturated source rock,but the materials dissolved are different in different depressions.The reservoir secondary pores of Dongying depression are generated from the dissolution of calcite cement,the ones of Zhanhua and Huimin depressions from the dissolution of feldspar,the secondary pores of Chezhen depression from the dissolution of feldspar in upper section,and the dissolution of calcite cement in the lower section of Paleogene,respectively.The secondary pores are developed in two depths and the depth goes down from west to east,from south to north in Jiyang sag.The major controlling factors for secondary pore development are maturity and location of source rock.Lastly,the favorable reservoirs are evaluated according to reservoir buried depth,sedimentation,and diagenesis.The reservoir with high quality is located in the northern and central parts in Dongying depression; there are some good reservoirs in Gndao (孤岛),Gudong (孤东),and Gunan (孤南) areas in Zhanhua depression,and the favorable reservoirs are located in the north steep slope and the south gentle slope of Chezhen depression and central uplift,south gentle slope of Huimin depression.     

非开挖水平孔的孔壁稳定性分析

土体水平钻孔孔壁稳定是非开挖成孔的关键,也是人们一直关心的的重要问题,严重的孔壁失稳将引发周围环境的动力破坏。本文采用有限元数值模拟技术着重研究孔壁周围土体应力应变场的变化对孔壁稳定的影响程度。探讨钻进过程中孔周土体应力分布和发展规律,分析孔壁稳定的条件和影响因素,可以为土体水平钻孔的施工和设计提供更可靠的依据。     

非开挖管道翻转内衬修复技术的探讨

本文重点介绍了翻转内衬修复技术的原理、工序、技术特点等,并概括介绍了其它几种非开挖修复技术修复城市燃气埋地管道的方法,最后展望了翻衬法的应用及推广前景。     

英国排水管道修复新技术

德国与英国的管道修复公司合作开发出一种称为Epros SeaLiner的原位固化法管道修复技术,其包括衬管材料、特制树脂和技术工艺。应用该技术能在地下水渗入破损管道的条件下施工,可靠密封衬管与宿主管之间环状间隙和枝管重开处的接头,彻底克服内衬修复及接口重开所致的渗漏问题。     

非开挖城市地下信息管线数据采集和建库

地下管线的数据采集和建库是实现地下管线信息化管理的基础和前提。本文提出了针对目前非开挖敷管数据三维数据采集和整理结合CAD进行三维成像的思路,与城市地下管线信息管理系统整合,实现地下管线的系统高效信息化管理。