基于测量机器人的隧道变形自动监测系统的设计与实现

文章结合工程实例介绍了基于测量机器人(TCA2003全站仪)开发的隧道变形自动监测系统的功能特点。分析了系统在南京地铁变形监测中的应用情况和精度。实际应用表明,系统测量效率高,数据传送准确无误,自动测量成果无论在平面或是高程方面都能达到很高的精度。在实际应用中取得的良好效果,可为同类工程的提供技术参考依据。     

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精密三角高程替代二等水准的可行性研究

研究了ATR精密三角高程测量的误差来源及精度,以涪江富金坝航电枢纽工程的实践,分析了TCA2003全站仪ATR三角高程测量的实测精度及其替代二等水准测量的可行性。     

基于远场参考的超低频(ULF)地震地磁数据处理——以2003年1月日本茨城县5.1级地震为例

野外观测和室内试验表明,地震孕育和发生过程中可能产生电磁信号。地震电磁现象在防震减灾中具有潜在的应用价值,已成为21世纪国内外地学研究热点之一。由于地震电磁信号较弱,通常混杂于空间场源信号及人文噪音中,不易在观测数据中提取出来。以2003年1月日本茨城县5.1级地震为例,探讨远场参考在超低频(ULF)地震地磁数据处理中的应用,进而检测震前局部磁场异常。在此基础上,讨论远场参考法的优势及可能存在的不足。分析结果表明,2003年1月日本茨城县5.1级地震发生前存在局部磁场异常,验证了远场参考方法的有效性,相关成果可为地震地磁数据处理提供有益参考。     

高精度对向三角高程代替等级水准测量的可行性研究

介绍了时向三角高程的基本原理,详细介绍了水准测量和对向三角测量的改正项,对比了实际项目的高精度三角高程测量数据和二等水准数据,说明利用高精度对向三角测量代替等级水准测量是可行的,并总结了利用高精度对向三角测量代替等级水准测量的一些建议;研究的内容和得出的结论对生产实践具有重要参考意义和实用价值.     

Double station and spectroscopic observations of the Quadrantid meteor shower and the implications for its parent body

Object 2003 EH₁ was recently identified as the parent body of the Quadrantid meteor shower. The origin of this body is still uncertain. We use data on 51 Quadrantid meteors obtained from double-station video observations as an insight on the parent body properties. A data analysis shows that the Quadrantids are similar to other meteor showers of cometary origin in some aspects, but in others to Geminid meteors. Quadrantid meteoroids have partially lost volatile component, but are not depleted to the same extent as Geminid meteoroids. In consideration of the orbital history of 2003 EH₁, these results lead us to the conclusion that the parent body is a dormant comet.     

THE CORE OF THE QUADRANTID METEOROID STREAM IS TWO HUNDRED YEARS OLD

The Quadrantids are one of the most active annual meteor showers and have a number of unusual features. One is a sharp brief maximum, 12–14 h in length. A second is the Quadrantids, relatively recent appearance in our skies, the first observation having likely been made in 1835. Until recently no likely parent with a similar orbit had been observed and previous investigators concluded that the stream was quite old, with the stream’s recent appearance and sharp peak attributed to a recent fortuitous convergence of meteoroid orbits. The recent discovery of the near-Earth asteroid 2003 EH1 on an orbit very similar to that of the Quadrantids has almost certainly uncovered the parent body of this stream. From the simulations of the orbit of this body and of meteoroids released at intervals from it in the past, we find that both the sharp peak and recent appearance of the Quadrantids can most easily be explained assuming meteoroids were ejected in substantial numbers near 1800 AD.     

上海长江大桥竣工荷载试验变形监测方法技术

上海长江大桥通车前夕,主桥斜拉桥进行了荷载试验,共用总重30吨加载车辆60辆,分不同工况对主桥各个控制断面挠度、塔顶位移、伸缩缝位移等参数进行测量。监测中采用全站仪自动化监测技术对主桥的各种形变参数进行了准确有效的测量,保证了竣工荷载试验顺利完成。自动化全站仪系统由自动照准测量全站仪以及定制机载软件和数据分析系统组成。     

TCA2003照准棱镜精度分析

为测试普通圆棱镜配合TCA2003自动全站仪的测量性能,以实际项目为背景,运用实验与对比的方法,分析了TCA2003自动全站仪照准棱镜的观测精度,绘制了各实验点位坐标较差图,结果表明,圆棱镜配合TCA2003自动全站仪的测量误差在亚毫米级内,可以适用于变形监测,且能满足一般工程应用要求。     

基于VBA的防震减灾办公自动化系统的设计与实现

VBA是集成在Word中的开发语言,编程结果可直接产生Word文档。本文结合地震系统防震减灾“三大工作体系”建设,分析了国家有关法律法规和中国地震局及甘肃省地震局发布的规范性文件、执法文书、审批报表及宏观异常填报表等的格式要求和特征,进行了系统分析和系统设计,利用Visual BASIC语言嵌入VBA指令开发了防震减灾办公自动化系统。