同心补偿式直升机时间域航空电磁法吊舱校准装置研究

直升机时间域航空电磁法(Helicopter-borne time-domain electromagnetic method,HTEM)的多次空中仪器校准可消除飞行过程中仪器系统受外界环境的时变影响.吊舱校准装置可解决地面环线方式无法实现的空中飞行过程中仪器校准问题.本文从研究同心补偿吊舱装置模型出发,提出了吊舱装置空间模型和线圈电路模型,分析了发射磁场的空间分布、补偿环作用及其与接收线圈的关系、校准装置的空间信息和信号的检测方法,得到结论如下:(1)以损失发射面积0.89%的补偿环可提高信号44.5 dB的动态范围;(2)校准装置水平安置在补偿环与发射线圈之间,其匝数越多、半径越大、离补偿环越近,信号响应越强;(3)校准线圈电感越大、电阻越小,其e指数衰减越慢;信号检测起点由含匹配电阻接收线圈的阻尼特性决定.通过校准线圈的曲线特性和装置位移实验,得出反映装置特性的时间常数实测误差小于1.3%,验证了线圈电路模型和装置空间模型.本文提出的模型和方法同样适用于偏心补偿式HTEM系统校准的研究和高阻地层上已知环线的静态检测.     

共创整装勘查新局面——2012年全国整装勘查推进会侧记

4月17日-19日,2012年全国整装勘查推进会在京召开。专家们对全国47片整装勘查区实施情况进行了评估,总结了经验,指出了问题,提出了建议。可以说,这次会议既是一次整装勘查进展情况汇报会,也是一次工作经验交流会;既是一次整装勘查推进情况的督促检查会,也是一次加快推进找矿突破战略行动的动员部署会。     

辽沈大地

沈阳积极推进"低效用地"再开发试点工作为解决沈阳市经济发展中土地指标瓶颈,通过改革的办法解决发展中存在的问题,沈阳市国土资源局积极推进"低效用地"再开发试点工作。通过对沈阳市低效地现状开展调查,掌握了全市"低效用地"基本情况,初步统计全市共有低效用地207平方公里,其中四环以内95平方公里。在此基础上,经过认真研究,拟定了低效用地再开发     

提高认识 把握重点 全力以赴做好地质灾害防治工作——在2013年全省汛期地质灾害防治工作视频会议上的讲话(摘要)

(2013年5月7日)加强地质灾害防治,有效地防御自然灾害的发生和减少因灾造成的损失,最大限度地保障人民群众的生命财产安全,是党和政府的一项重要工作,更是我们国土资源部门的一项神圣职责。上个月在四川芦山发生的地震,又一次为我们做好地质灾害防治工作敲响了警钟,加强防灾减灾刻不     

分类指导 改革创新 全面推进资源型城市可持续发展——《全国资源型城市可持续发展规划》专家解读之二

正《全国资源型城市可持续发展规划》(以下简称《规划》)是我国第一次针对资源型城全市制定出台全国性、专门性的规划文件,充分显示了党中央、国务院对资源型城市可持续发展问题的高度重视。长期以来,资源型城市作为我国重要的能源资源战略保障基地,为全国经济社会发展做出了巨大贡献,同时在发展过程中也积累了诸多矛盾和问题。加快资源型城市经济发展方式转变,尽快建立《规划》出台对资源型城市可持续发展具有重要指导意义     

A CASE STUDY ON CONCENTRATION AND DECENTRALIZATION：BEHAVIOR AND DYNAMIC MECHANISM OF SPATIAL EVOLUTION IN METROPOLITAN AREA，NANJING，CHINA

In rapid socio-economic development,the process of concentration and dispersal of various elements tends to be more dramatic,tremendously influencing the shaping and transformation of the space in metropolitan area.Survey of spatial concentration and decentralization has thus become a basic method in examining metropolitan spatial evolution.In this research,three elements were selected as the essential indicators of the process:demographic density distribu-tion,employment density distribution and business office location.Performance of these elements in Nanjing City was exam-ined historically.As Nanjing City could be regarded as a representative of metropolitan areas in China,its situation large-ly suggestes the general characteristics in similar areas of China.Hence based on the investigation of Nanjing City,four general implications were highlighted.First ,metropolitan areas in China are in a violent process and shift of spatial concentra-tion and decentralization.Second,from now to at least the near future,concentration will continue to be the central fea-ture.Third,the landscape of metropolitan areas basically exhibits a dual structure character.The gap in environmental and ecological qualities among different districts will continue for a long time.Fourth,Central Business District (CBD) is playing an important role in helping to convert the traditionally single-centered city structure into a polycentric one.     

Incorporation of Perception-based Information in Robot Learning Using Fuzzy Reinforcement Learning Agents

Robot learning in unstructured environments has been proved to be an extremely challenging problem, mainly because of many uncertainties always present in the real world. Human beings, on the other hand, seem to cope very well with uncertain and unpredictable environments, often relying on perception-based information. Furthermore, humans beings can also utilize perceptions to guide their learning on those parts of the perception-action space that are actually relevant to the task. Therefore, we conduct a research aimed at improving robot learning through the incorporation of both perceptionbased and measurement-based information. For this reason, a fuzzy reinforcement learning (FRL) agent is proposed in this paper. Based on a neural-fuzzy architecture, different kinds of information can be incorporated into the FRL agent to initialise its action network, critic network and evaluation feedback module so as to accelerate its learning. By making use of the global optimisation capability of GAs (genetic algorithms), a GA-based FRL (GAFRL) agent is presented to solve the local minima problem in traditional actor-critic reinforcement learning. On the other hand, with the prediction capability of the critic network, GAs can perform a more effective global search. Different GAFRL agents are constructed and verified by using the simulation model of a physical biped robot. The simulation analysis shows that the biped learning rate for dynamic balance can be improved by incorporating perception-based information on biped balancing and walking evaluation. The biped robot can find its application in ocean exploration, detection or sea rescue activity, as well as military maritimeac tivity.     

基于超声的水中异物探测装置硬件电路设计

超声波在传播中遇到不同介质或障碍物等会发生反射或散射.利用这种特性可以探测水中异物.考虑到被测物的尺寸和声特性.采用1MHz(水中波长为1.5 mm)的高频超声波比较合适.基于和雷达类似的回波脉冲测距、相位测速和强度测幅原理,设计了一个20霺脉宽、2mS周期的发射脉冲产生、超声换能驱动和收发开关电路,以及接收回波处理电路,并由相参时钟以欠采样方式进行模数转换.系统由TTL电路、小信号低噪声模拟电路、MSP430F149单片机等部分构成.实验结果表明,装置对固体障碍物具有稳定、强回波反应,对于不同尺寸的活动气泡仍能产生正常回波信号;这些结果可通过单片机以串行方式送入微机中,以便进一步处理和显示.     

一种新型数字水准仪室内检定装置

数字化精密水准测量仪器在水准及形变测量领域中起着极其重要的作用,而对数字水准仪的计量检定工作是使其正常运行的前提,针对其检定项目室内化的难题,介绍了一种国产新型数字水准仪的室内检定装置.     

ZTY-1型海床基水下系统状态监测仪的研制

随着海洋经济的发展和近海生产活动的急增 ,我国近海约１／３海域均受到污染 ,特别是河口、海湾和近岸海区污染更加严重 ,需要对这些海区的海洋环境参数进行长期、同步、自动监测 ;在海洋军事上 ,准确、可靠的海洋环境数据是必不可少的战略服务资料 ,将大大提高海上作战能力。因此 ,国家８６３计划海洋监测技术 (８１８)主题的近海环境自动监测技术的课题中 ,列有海床基海洋环境自动监测系统的研究项目。该监测系统是置于水深大约５０ｍ的海底边界面上 ,用于监测海洋环境要素的装置。通过本课题的实施 ,将使我国的海洋环境立体自动监测技术…