矿区1∶5000地形图遥感快速成图方法

文中以数字正射影像图(DOM)和高精度的数字高程模型(DEM)为主要信息源,实现煤矿区地形图快速成图;讨论了快速成图的关键技术并对地形图精度用GPS进行了检校.结果表明:该方法用于矿区地形图快速成图是可行的,可以满足矿区生产和可持续发展的需要.     

矿区1:5000地形图遥感快速成图方法

文中以数字正射影像图(DOM)和高精度的数字高程模型(DEM)为主要信息源,实现煤矿区地形图快速成图;讨论了快速成图的关键技术并对地形图精度用GPS进行了检校。结果表明:该方法用于矿区地形图快速成图是可行的,可以满足矿区生产和可持续发展的需要。     

基于多层DEM的露天矿三维地质模型构建及其应用

三维地质实体建模对于露天矿的工程设计与决策具有十分重要的意义.文章提出了一种快速构建露天矿三维地质实体模型的方法--包络面构模法.该方法通过建立多层DEM表面模型和侧面DEM模型,利用固化成体技术生成三维地层实体模型,并以实际工程数据对建模方法进而验证.研究表明,该方法具有同时表达空间对象表面和内部结构的能力,可在工程设计、采掘计划编制以及虚拟开采中得到了很好的应用.     

基于GIS的矿山尾矿库选址方法研究——以个旧锡矿某矿山为例

矿山尾矿库地址的选择，涉及到一个矿山生产的经济效益与环境污染等问题。选择尾矿库时除了要选择低洼区外，还要考虑的因素有离选矿厂的距离、是否有断裂带、尾矿库容量等问题。GIS的空间叠加、缓冲区分析等强大空间分析功能，为矿山尾矿库地址的选择提供了帮助。应用ArcView和MapGIS等软件，对个旧锡矿某矿山的地形图与地质图进行了矢量化处理，建立了矿区的数字高程模型（DEM），运用DEM直观地判断出矿区的低洼区，并对各低洼区进行了容积的计算。通过对矿区位置图、地质图和DEM的叠置分析、离矿厂距离的缓冲区分析，以及矿区低洼区容积的比较后，得出了该矿山尾矿库的最优位置。研究后认为该方法具有选址直观、效率高等特点，值得推广。     

基于GIS的测量平面控制网设计与优化

探讨了基于GIS的控制网点自动选取和控制网自动组建方法,提出了一种以数字高程模型DEM为基础,数字地形分析为主要技术手段的控制网自动设计与优化的新方法。通过对测区数字地形分析提取候选控制点,建立关联矩阵,生成控制网,最后用蒙特卡罗方法对生成的控制网进行了精度估计和优化。     

基于DEM模型的矿体储量计算方法与结果可视化

本文详细介绍了如何利用给定工业指标动态建立矿体DEM模型和利用矿体DEM计算其储量的新方法。该方法不仅可以提高计算结果的精度,降低对矿体形态和控矿工程的依赖程度,而且,能确定矿体在三维空间的展布状况,使计算结果三维可视化。     

ArcGIS中建立DEM方法及其应用

综合运用AutoCAD、MapGIS与ArcGIS三个工程设计与地理信息系统软件,对某数字地形图进行处理,以生成该地区的DEM。首先,在AutoCAD中对地形图进行等高线图层分离并保存为一个单独DXF格式文件;然后在MapGIS软件里完成等高线断线连接及赋值操作;最后,在ArcGIS中使用处理后的等高线图层建立DEM,并进行光线照射角、视角设置、渲染(分级显示)与三维分析,创建坡度图和剖面图等,为技术人员提供了参考。     

InSAR技术协助构建矿区数字高程模型及应用

数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。DEM用途广泛,数字地球、数字城市、数字区调等工作以及虚拟现实三维可视化都需要高精度的DEM支撑。本文分析了用InSAR技术构建矿区DEM的方法及其在矿区开发和建设中的实际应用。     

基于ArcGIS 9.2的矿区地表三维模型建立方法研究

地表三维模型在众多领域有着广泛的应用,如在各种地形区域中进行工程规划和优化设计,预期成果显示等。其建立效果的本质是建立一个区域电子沙盘,进行地表三维模型的制作和显示不仅便于用户直观地了解区域的地形地貌,同样也方便用户查询相关信息进行分析。主要研究了在利用数字测量方法所获得的矿区AutoCAD图形的基础上,基于ArcGIS9.2软件平台生成不规则三角形格网(TIN),并在此基础上创建数字高程模型(DEM),再与研究区ICNOS影像叠加建立地表三维模型的方法,然后初步讨论地表三维模型在矿山开发规划设计过程中的应用。     

大比例尺数字高程模型中断裂线的处理探讨

根据建立数字高程模型(DEM)的基本要求,分析了断裂线中常见的陡坎在大比例尺不规则三角网型DEM中的成图特点,提出了用面积阀值来对三角网中的三角形进行取舍,并用模拟数据进行了试验.     

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。