The detection of structural deformation errors in attitude determination

In the determination of the attitude parameters from a multi-antenna GPS array, one of the major assumptions is that the body frame is rigid at all times. If this assumption is not true then the derived attitude parameters will be in error. It is well known that in airborne platforms the wings often experience some displacement during flight, especially during periods of initializing maneouvres, such as taking off, landing,and banking. Often it is at these points in time that it is most critical to have the most precise attitude parameters.There are a number of techniques available for the detection of modeling errors.The CUSUM algorithm has successfully been implemented in the past to detect small persistent changes. In this paper the authors investigate different methods of generating the residuals, to be tested by the CUSUM algorithm, in an effort to determine which technique is best suited for the detection of structural deformation of an airborne platform. The methods investigated include monitoring the mean of the residuals generated from the difference between the known body frame coordinates, and those calculated from the derived attitude parameters. The generated residuals are then passed to a CUSUM algorithm to detect any small persistent changes. An alternative method involves transforming the generated residuals into the frequency domain through the use of the Fast Fourier Transform. The CUSUM algorithm is then used to detect any frequency changes. The final technique investigated involves transforming the generated residuals using the Haar wavelet. The wavelet coefficients are then monitored by the CUSUM algorithm in order to detect any significant change to the rigidity of the body frame.Detecting structural deformation, and quantifying the degree of deformation, during flight will ensure that these effects can be removed from the system, thus ensuring the most precise and reliable attitude parameter solutions. This paper, through a series ofsimulations, will assess the effectiveness of the above mentioned techniques for detecting structural deformation effects on a GPS multi-antenna array. These principles are then tested with experimental data.     

中国西部城镇化发展的“三分”构想

在经济全球一体化和经济区域化已成为当今世界经济发展大势的背景下，西部区域经济之所以发展不利，根本原因是区域经济理论陈旧落后，缺乏创新的区域发展思维。这些深层次的问题得不到解决，西部的城镇化水平和区域经济难以得到快速发展。因此，“三分构想”的提出是十分必要和迫切的。     

Comparison of the effects of different isomers of bicuculline infused in the preoptic area on male rat sexual behavior

Summary Intracerebral infusion of (+) bicuculline methiodide, but not of its (–) isomer, in the preoptic area, stimulated masculine sexual behavior in rat as evidenced by a decrease in the number of intromissions preceding ejaculation and a shortening of the ejaculation latency and postejaculatory interval. Data suggest a role of the GABAergic system in mediating masculine sexual behavior.Acknowledgments. Authors wish to thank Ms Elisabeth Wallin for excellent technical assistance and Ms Madelene Kröning for preparing the figures.     

曲棍球赛场技战术的计算机分析系统

介绍在ＩＢＭ－ＰＣ／ＸＴ计算机上实现的曲棍球赛场统计系统的研制过程、设计思想、采用的方法、软件设计与功能、技术指标操作步骤以及使用效果。     

高效液相色谱法测定制剂中生长抑素的含量

介绍了一种用高效液相色谱法测定制剂中生长抑素含量的新方法,该法测定准确,操作简便,重现性好.     

老式油压材料试验机测试系统的技术改造

对老式油压材料试验机进行技术改造的方案是利用原试验机结构框架和加载系统。改进落后的测试系统使其达到现代科技水平。本文论述了进行改造的项目、工作原理、实施方法。方案一经买施．对拥有大量老式油压材料试验机的我国．其社会效益和经济效益都将是十分可观的。     

OPTIMAL SETTING-UP OF KNITTING ELEMENTS AND ITS EFFECT ON TENSION VARIATION

The dynamic yarn tension variations during knitting cycle are very difficult to control and be-come one of barriers to knitting on modern warp knitting machine.Examination of experimentaldata and theoretical analysis show that the relative position of spring rail to knitting elements suchas needle,guide as well as their displacement has noticeable effect on tension variation so that theknitting condition can be much improved by rearrangement of the knitting elements and theirmovement within a knitting cycle.     

独立数≤5的3-边连通简单图的上可嵌入性

结合边连通度，本文探讨了3-边连通简单网的独立数与上可嵌人性的关系，我们得到了下列结果：设G是一个3-边连通简单图，α（G）是G的独立数，若α／（G）≤5，则G是上可嵌入的，同时我们又得到了两个在3-边连通意义下最小的非上可嵌入图例．     

新世纪图书馆员社会角色转换研究综述

就近几年图书馆界关于新世纪馆员意识转换及社会角色转换等方面的研究进行了综述，指出新时期的馆员要实现自我社会角色的转换，首先是要明确转换的必要性，然后采取有效的策略逐步地、系统地推进转换，才能取得较好的效果。     

小窑采空区在地震勘探时间剖面上的解释

从山西晋城小窑采掘现状入手，结合钻探制作煤全采、未采、半采三种模型的合成地震记录换层分析，分析其波形特征，标定了时间剖面上的采空区段与矿方实际采空区基本吻合。