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。     

RTK技术在控制测量中的应用研究

GPS RTK(Real Time Kinematic)技术的快速定位功能为其应用创造了良好的条件,但其定位精度验后估计的欠缺又使其应用受到一定的限制。本文针对此问题进行了研究,给出了GPS RTK测量成果的精度估计方法,并对GPS RTK测量技术用于控制测量的可行性进行了探讨,导出了相应的测量限差,为CPS RTK测量技术用于控制测量提供了理论依据和技术规定。     

GPS RTK技术及其在地籍测量方面的应用

论述了GPS RTK技术及其在地籍测量方面应用,着重阐述了RTK技术在地籍测量、土地勘测定界、工程测量和放样等方面的应用,并总结了目前RTK自身存在的不足及其今后所需解决的问题。     

RTK技术在矿山测量中的应用

RTK技术是GPS测量技术发展中的一个新突破,在测量领域中已得到广泛的应用,尤其在矿山测量中非常适用。针对RTK技术在矿山测量中的应用进行了阐述,分析RTK技术在矿山测量中的优势和优点,以及在实际应用中遇到的问题和处理方法。     

RTK中继站在露天矿测量通讯中的应用

RTK测量是GPS技术和通讯技术完美结合的产物,目前RTK技术正广泛应用于露天矿测量。以内蒙古霍林河露天矿为例阐述RTK中继站,在露天矿测量中的应用及所解决测量中的实际问题。     

RTK技术在线路工程测量中的应用

线路工程测量的重点和难点工作是曲线测设,传统的测量方法都不能很好的解决曲线放样的精度和效率问题;使用RTK技术进行线路测量,克服了传统测量方法在曲线测量中的局限性。通过RTK在线路工程测量中的具体应用,阐述了RTK技术用于线路工程测量的优越性。     

RTK技术在矿区测量中的应用

通过对RTK技术的工作原理和影响RTK测量精度因素的分析,结合Trimble 5700 GPS RTK在矿区测点定位及测设放样的工作实例,指出了RTK技术在矿区测量中的优势以及其在实际应用中应注意的一些问题。     

RTK中继站在胜利东二矿测量中的应用

RTK测量技术时下已风靡全球,应用范围几乎遍及各行各业,因为其测量模式和测量速度、精度比以往的测量方式有了很大的变革。现在,RTK测量技术正广泛应用于露天矿测量。RTK中继站是解决露天煤矿在死角、高度截止角较小以及信号较弱地段所进行测量工作时加强通讯信号的一种方法。应用RTK中继站,可以解决测量工作在恶劣环境条件下不能进行测量工作时的实际问题。     

RTK技术在输电线路测量中的应用

探讨了将RTK测量技术应用于输电线路测量中的实际工作方法,结合输电线路测量工作的特点分析了影响RTK作业的因素,并就RTK测量中遇到的问题提出了解决方法。分析认为在输电线路测量中应用RTK不但可以提高作业速度和质量,而且可以优化路径方案,经济效益十分明显,具有广阔的推广应用前景。     

RTK技术及其在道路测量中的应用

从RTK技术在测量中的工作模式、数据链的结构、技术特点、RTK作业步骤、RTK成果精度分析等方面，讨论其在道路测量中的控制测量、线路勘测、中线测量、施工放样等方面的应用。     

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。