在云南天文台1m望远镜上实现远程遥在观测

远程观测是随着计算机技术、通讯技术、数据压缩技术发展起来的一门新型观测技术。与传统的天文观测方式相比，它具有十分重要的意义。１９９５年１２月２５－２６日我们在北京利用云南天文台１ｍ望远镜，首次成功地对土星及其卫星实施了远程观测。本文详细地介绍了这次观测，并讨论了在目前国内现有的硬件和软件环境下，实现远程观测的技术方法和难点。最后展望了远程观测的广阔前景。     

Deep waters: Lessons from community meetings about offshore wind resource development in the U.S.

Meeting the United States׳ offshore renewable-energy goals for 2030 necessitates deploying approximately 9000 wind turbines along U.S. coastlines. Because siting bottom-mounted turbines in most nearshore coastal zones is either impractical or politically difficult, turbine developers are testing floating-platform turbine technologies for deeper waters. Deepwater, floating-platform turbines have the advantages of being sited in the highest quality winds farther offshore, movable if desired, and located beyond the horizon, out of sight from shore. This paper reports on conversations with 103 coastal stakeholders at community meetings regarding development and testing of floating turbines off the coast of Maine, U.S.A. Using naturalistic field methods, this essay reports common questions and concerns of commercial lobstermen, fishermen, and coastal civic leaders. Early-stage conversations suggest that once coastal community members understand the benefits and impacts of wind farm development on their quality of life, many share specific preferences for where offshore developments could be located. Citizens׳ remarks are sophisticated, nuanced, and innovative and include robust ideas for pairing turbine siting with fishery conservation. Findings imply that when looking to site offshore turbines in public, multiple-use ocean spaces, developers, planners, and coastal communities should engage early and often in two-way conversation rather than one-way outreach.     

直接序列扩频通信中的抗窄带干扰非线性自适应滤波器

分析用于直接序列扩频通信中窄带干扰抑制的几种非线性自适应滤波器,提出了一种称为非线性LTJ(Lattice and Transversal Joint)滤波器的新型非线性抗干扰滤波器.对比几种滤波器的信噪比改善性能、收敛速度以及计算复杂度,发现非线性LTJ滤波器具有收敛速度快的优点,并且在干扰强度较大时,其抗干扰性能要比非线性Lattice滤波器好.     

采用VC + + 的射电望远镜控制软件在Windows XP下的设计和实现

射电望远镜控制软件的主要功能是控制射电望远镜精确、实时的跟踪指定目标,本文介绍了Windows XP系统下基于Visual C 的射电望远镜控制软件的设计,重点叙述了软件的功能、通信方式、图形界面的实现[2]。     

W—COMSYS多用途微机数据交换系统

本文介绍一种微机数据交换系统。该系统参考OSf基本模式设计,适合目前国内IBM—PC/XT微机通信状况。系统在假脱机方式下通信,软件设计上大量采用中断窃权的办法。文章还针对PC机执行双用户/双任务工作时,容易发生磁盘瓶颈效应的现象,介绍了解决磁盘I/O瓶颈效应的方法。 系统采用半双工制式异步串行通信,速率为50～9600bit/S任选。网络结构采用全通型〔无线、有线〕、总线型〔有线〕或辐射型〔报线〕。用户根据需要可进行选址和全址通信,以实现微机远程磁盘文件拷贝。     

ATLANTA'S ROLE AS AN INFORMATION CENTER: INTERMETROPOLITAN SPATIAL LINKS

Atlanta has emerged in the 1980s as a major second-order command and control center within the US economy and demonstrates considerable dominance within the Southeast. Federal Express Corporation data permit examination of Atlanta's national and regional command and control functions. The concepts of information genesis, hierarchy of control, and spatial independence of information receipt clarify Atlanta's place within the specialized information network. Atlanta occupies an advantageous position within the intermetropolitan information network from which much of the Southeast's economic activity is organized.     

单基站GPS差分系统设计与实现方法

GPS差分系统是位置服务系统的重要组成部分,提出了建立单基站GPS差分系统的整体框架,分析了系统构建中的关键技术、程序设计流程和实现方法。     

基于EVC的PDA和全站仪数据通信

掌上电脑(PDA)是野外测量成图一体化最适宜的硬件平台之一。设计了一个多种型号全站仪通信参数的通用数据存储格式,介绍了一种基于Windows CE操作系统和eMbedded Visual C++3.0开发工具,利用Win-dows CE API函数和多线程技术实现掌上电脑与全站仪的数据通信的方法。该方法弥补了基于ActiveX控件方法的不足,功能丰富,灵活度高,可扩展性和可移植性强。     

Design and implementation of framework of mobile GIS based on phone terminal for environmental monitoring

This paper proposes a method for constructing an extensive wireless GIS network by utilizing Java cellular phone as GIS terminal for environmental monitoring through dynamic location disaster-emergency notification management of spatial databases. An experimental case study is demonstrated to show its potential in the application field.     

基于实测的软土路基沉降时效研究

软土路基的稳定性对公路的性状与运营质量具有举足轻重的作用,它与路基的内部结构、成分、体量、外界环境有着密切的关系。通过布设边桩点、埋设沉降板、布设测斜管的方式进行沉降观测。在大量的实测数据基础上,运用回归分析原理,对软土路基的沉降时效问题进行了整体性研究,总结出环太湖流域软土路基沉降时效的经验型数学表达式。从锡澄高速公路软土路基沉降时效的预测效果来看,预测结果和实测数据较为吻合。