GPS RTK测量技术在煤田地质勘探中的应用

论述了GPS RTK(载波相位动态实时差分)的测量原理和利用GPS RTK技术进行煤田地质勘探测量的方法,也分析了利用GPS RTK技术进行煤田地质勘探测量的局限性.     

实时动态测量技术的应用

实时动态(RTK)测量技术是以载波相位观测量为根据的实时差分GPS测量技术,介绍了RTK测量技术的原理及作业方法,分析了RTK作业中的难点和对策.     

GPS RTK技术的误差分析及质量控制

GPS RTK技术以其高效率在测绘领域发挥着重要作用,减少误差提高精度是GPS RTK技术运用的关键。分析GPS RTK技术在实际应用中各种误差来源和预防方法,阐述从环境、仪器、技术处理等方面减少误差来提高精度,加强质量控制,同时运用实例,与全站仪实测边、四等水准比较,验证了GPS RTK通过减少误差提高精度技术。     

浅谈RTK技术

GPS载波相位测量技术从静态、快速静态发展到实时动态(RTK),改变了空间信息的采集方式和定位方式,拓展了GPS的使用空间.GPS RTK测量技术以其高效率、高精度的优点得到测绘界的广泛应用.该文在调查研究的基础上,介绍了RTK技术在国内外的研究现状,主要就RTK的测量原理、基本配置、GPS RTK的应用进行了讨论,分...     

浅谈GPS-RTK高新技术在纵横断测量中的应用

GPS-RTK测量技术是以载波相位观测变量为根据的实时差分GPS测量技术，本文给出了将该技术用于纵横断测量中的情况，并分析了影响GPS-RTK精度的原因和建议。     

GPS RTK在地球物理勘探中的应用

GPS(Global Positioning System)全球定位系统是以卫星为基础的无线电卫星导航定位系统,具有全球性、全天候、连续性、实时性导航定位和定时功能,而且具有良好的抗干扰性和保密性,能为各类用户提供精密的三维坐标、速度和时间。RTK(Real time Kinematic)技术即实时载波相位差分技术,是实时处理两个测点载波相位观测量的差分方法,它具有观测时间短、精度高、无须通视和现场给出精确坐标等优点。     

GPS RTK技术在线路测量中的应用

针对GPS RTK技术在线路测量应用中的工作条件、数据链传输、作业速度、作业方法、作业精度,误差特性中的天线相位中心位置的偏差、基准站的位置误差、多路径误差、信号干扰、气象条件及质量控制等问题,结合测量的作业特点,提出了提高RTK作业精度若干方法,论述了RTK技术的优点与不足。     

RTK技术在城市测量中的应用

实时动态GPS测量技术——RTK技术以其对工作环境要求低，定位精度高，数据安全可靠，减小误差积累，数据处理简捷，操作简便，作业效率高的优势，在测绘领域得到越来越广泛的应用。对RTK技术在城市测量中的应用实例或试验进行了探讨，指出了RTK技术在应用中应注意的若干问题，对相关的测绘实践具有一定的现实意义。     

GPS RTK在数字测图中的应用

结合GPS RTK技术在临港产业区数字测图中的应用，简述GPS RTK的工作原理、参数转换的求解方法及其精度评定，介绍了RTK技术在图根控制测量和地形测图中的应用情况，得出几点结论。     

RTK在矸石山1:5000地形图测量中的应用

矸石山地区地形复杂，常规方法测量地形图比较困难，采用载波相位差分技术（RTK），既能加快观测速度，又能保证精度要求。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。