平原地区钻井水溶矿区地表形变D-In SAR监测研究

针对某平原地区钻井水溶矿山地处农业高产示范基地、矿体开采深度小、开采厚度大、地表形变监测要求准确及时的特点,采用合成孔径雷达差分干涉测量(D-In SAR)技术计算地表形变值,并估算数据质量。将获取的地表形变图与数据质量估算结果导入Arc GIS,计算地表形变值,分析矿区形变趋势,以及形变值与监测精度的相关性规律。结果表明,D-In SAR监测对平原地区钻井水溶矿区具有较强适用性:Goldstein滤波是去除平原地区钻井水溶开采矿山地表形变D-In SAR监测相位噪声的有效方法;钻井水溶矿区地表形变趋势与开采推进进度一致,地表沉降呈正态分布规律,盆地近似碗状;监测精度与形变大小具有负相关性,地表形变越小,干涉相干性系数越大,监测精度越高。     

D-InSAR技术在煤矿开采沉陷监测中的应用探讨

该文在综合分析雷达差分干涉测量技术(D-In SAR)的技术原理和技术发展的基础上,探讨了D-In SAR技术在煤矿开采沉陷监测中的使用范围及应用方法,并结合已有应用案例总结了该技术在开采沉陷监测中亟待解决的若干问题。研究结果表明:D-In SAR技术的应用为开采沉陷的动态监测和采煤引起的地表时空演变过程的研究提供了一种新的技术方法。     

基于D-InSAR监测数据的数值模型参数校准方法研究及应用

针对目前开采沉陷领域仅用地表最大下沉值作为参数反演指标的缺陷,同时考虑到D-In SAR数据能实时获取下沉区域的沉降值及边界的优点,分析了基于D-In SAR监测数据进行数值模型参数校准的可行性和必要性。研究成果对于开采沉陷数值模型建立、校准及实际工程应用具有重要的指导意义。     

D-InSAR技术在矿区开采沉陷中的应用及发展趋势

合成孔径雷达差分干涉测量(D-In SAR)具有空间分辨率高、全天时、覆盖面积大、成本低等优点,在矿区开采沉陷监测中得到了广泛应用。首先对D-In SAR基本原理、数据处理方法(二轨法)的基本流程做出简要的分析,然后通过实例介绍了D-In SAR技术在矿区开采沉陷中的应用。分析了D-In SAR技术优势和应用中存在一定的误差,提出了一些解决措施。就D-In SAR技术的发展前景进行预测分析。得出以下结论:D-In SAR测量技术能够清晰地反映矿区整个地表形变量。二是结合D-In SAR矿山开采沉陷监测成果,对该技术的基本原理及应用现状进行了深入分析,认为加强与GIS的集成是矿山开采沉陷研究的一个发展方向。     

PSI技术在北京城区地表沉降形变监测中的应用研究

针对DIn SAR技术中时间、空间失相关及大气延迟等问题引起的In SAR技术对地表沉陷变形监测的影响,研究了应用永久散射体差分干涉测量(PSI)技术特点及在地面沉陷变形监测应用中的优势,通过利用PSI技术对北京地区进行地表沉降监测方法的研究和应用,获得了监测区大量PS点的沉降速率,生成了监测区的沉降位移图,结合监测区的地表沉降特征与地质环境监测成果,分析了地下水位与沉降量变化的关系,得出了研究期间监测区域地表的沉降成因,这对分析北京地区地表沉降规律具有一定的指导意义。     

基于D-InSAR技术的煤矿区沉陷监测

煤炭开采引起的地表移动变形时间集中、形变量大,使得基于D-In SAR技术的煤矿区沉陷监测受到了诸多的限制,很难获取准确的地表沉陷信息。为使D-In SAR技术能够更好地应用于煤矿区沉陷监测,采用"两轨法"差分干涉技术处理了多景Radar Sat-2影像数据,通过实验分析了植被因素对影像相干性的影响,探究了监测量级对地表沉陷信息解译结果的影响,并以峰峰矿区的九龙矿为试验区对D-In SAR技术的监测精度进行了分析。结果表明:地表植被覆盖率是影响影像间相干性的决定性因素,在地表植被稀疏的冬季相比植被茂盛的夏季更适合使用DIn SAR技术进行地表形变监测;由于地质采矿条件复杂,导致地表下沉速度超过卫星可监测范围,通常只能准确监测到盆地边缘的形变;当沉降量不超过监测量级时,D-In SAR技术的监测结果与常规水准测量的结果大致吻合;随着相关理论研究的不断深入与处理软件的日趋成熟,D-In SAR技术在煤矿区沉陷监测中的应用前景将更为广阔。     

D-InSAR技术在岱庄生建煤矿地面沉降监测中的应用

合成孔径雷达差分干涉测量技术(D-In SAR)已在矿区地面沉降监测方面得到了广泛的应用。为研究岱庄生建煤矿开采引起的地面沉降状况,文中选取8景ENVISAT ASAR数据,基于GAMMA软件进行双轨D-In SAR处理,得到一系列结果图;结合收集到的水准数据,着重分析了岱庄生建煤矿在20071020~20080202监测时间段内的地面沉降分布、沉降量等,并与水准数据进行精度验证。研究结果表明:利用D-In SAR技术可正确地得到矿区沉降分布、沉降量等情况,为煤矿区的合理开采和可持续发展提供一定的技术支持和理论借鉴。     

基于D-InSAR技术的矿区地表沉陷监测

结合D-In SAR技术全天时、全天候、高分辨率和连续空间覆盖等特点,基于7景Terra SAR-X影像数据,采用二轨差分方法,得到山东南屯矿地表沉陷D-In SAR数据,与水准数据进行对比。根据二者的差值与距离的关系,采用最小二乘多项式拟合的方法,得到D-In SAR数据的修正公式。修正后D-In SAR数据的精度满足地表形变监测的需求,具有广阔的应用前景。     

D-InSAR技术在矿区地表沉降监测中的应用

利用欧空局ENVISAT ASAR雷达数据,获取了SAR影像的干涉条纹并结合SRTM DEM数据,分别采用了二路差分和三路差分对武安市下团城村铁矿区域地表沉降进行监测,获得了区域内的最大沉降值和沉降带分布情况,初步探索了无目标、无时域、大范围、高精度地对地表进行沉降监测的方法,得出了影响最终结果精度的主要因素。     

基于D-InSAR的地表沉降监测技术应用

挑选了2012年11月—2012年12月RADARSAT-2 C波段雷达数据,利用合成孔径雷达差分干涉测量技术进行西石门矿区地表沉降监测研究。通过“双轨法”进行差分干涉处理,获得了研究区内的沉降带分布情况和最大沉降量,表明了差分雷达干涉测量技术监测地表微小形变的可行性,并得到了影响最终结果的误差因素。最后解释了研究区的地表沉降原因,提出了预防对策。     

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     

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     

2014 second batch of rare earth quota released

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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