地质雷达在井巷掘进超前地质预报中的应用

以龙塘沿铁矿为依托,对开拓掘进巷道进行了地质雷达超前探测,通过对探测信号的处理分析,分别对破碎带、富水区域、软弱围岩以及矿岩分界面进行了预报,并进行开挖验证。对各种不良地质情况的地质雷达信号特征进行了分析,初步总结井下地质雷达探测信号解释规律,并对金属矿山井下常见的干扰信号进行了分析。研究结果表明地质雷达可较好分辨不同类型的不良地质体,可在井下巷道超前地质预报中推广应用。     

隧道超前地质预报的雷达数据处理及解译研究

地质雷达作为隧道超前地质预报的重要方法之一,在隧道施工中已经得到了广泛的应用。该文针对回波信号的特点,提出了一套完整有效的雷达数据处理流程,并基于时域有限差分方法对基本地质体回波波形特征进行了研究,从而建立了雷达超前地质预报回波图像的解译流程和方法。实践证明,该文提出的方法可以有效地保障雷达超前地质预报数据的处理效果和解译精度,对于地质雷达在隧道超前地质预报工作中的应用具有重要意义。     

二维小波变换在矿井地质雷达信号中的应用

在矿井地质雷达探测中有各种噪声干扰,为使得回波信号能准确清晰地反映目标体,必须对其进行处理,而常规的去噪方法效果不理想.采用小波变换的时频分析方法,能有效地消除噪声干扰,保留有效波信号中的低、中、高频成分.同时考虑到空间上道集的相关性,运用二维小波变换的理论,选择合适的小波基,并采用阀值量化的思想,通过分解和重构,得到去噪后的地质雷达记录.经过模型数据的研究和对矿井雷达数据的应用表明,二维小波变换具有较强的信噪分离能力,能够提高记录的信噪比和分辨率.     

地质雷达瓦斯信号探测的可行性分析

分析了采用大气空间雷达先进的信号处理方式,对煤矿瓦斯探测信号进行采样、滤波、分析,得出瓦斯分布情况的可行性和技术实现途径;展望通过分析得到的瓦斯数据,并由此推断煤矿瓦斯的地质构造分布,为煤矿安全评估及预测提供依据;借助地质雷达巷道的瓦斯探测数据,建立和修正模拟系统,并用matlab进行计算机信号仿真,从而改进地质雷达的信号处理方式。     

ZTR12矿用本安型地质雷达数据传输改进方法研究

针对ZTR12地质雷达采用通讯电缆的方式进行多路模拟信号传输,存在信号受外界干扰严重,信号间容易相互串扰,进而导致信号波动、信噪比降低,在井下复杂的环境中,信号质量更差的问题,提出了一种基于以太网的数据传输方法,该方法采用双绞线传输数字信号的方式进行数据传输。利用标准差波动和相似性夹角对采集数据进行稳定性分析,结果表明:该方法在抗干扰能力和信号稳定性方面有较大提高,此外,轻柔的双绞线替代沉重的通讯电缆使设备更加轻便。     

矿井地质雷达超前探测方法及应用研究

为保证煤矿安全施工与开采,落实"有掘必探"原则,达到准确识别矿井灾害源、降低风险的目的,采用地质雷达方法进行超前探测具有探测精度高、施工方便及处理解释高效的特点。通过对山西某煤矿进风巷和回风巷地质雷达探测的实际应用,分析了地质雷达的工作原理、探测方法及数据处理流程。采用50、200 MHz两种频率雷达对掘进巷道掘进工作面面进行超前探测,准确探测了前方50 m范围内地质情况。通过与掘进段实际揭露进行验证,探测显示的陷落柱、破碎带及煤岩交界面均与实际对应较好。结果表明,矿井地质雷达超前探测具有较好的探测效果,可以为巷道掘进提供有力的技术支持,是矿井超前探测的高效、高精度探测新方法。     

地质雷达测试技术在煤矿的应用

介绍了地质雷达的工作原理,雷达资料的处理和解释,以及地质雷达在煤矿井下的2项具体应用。对地质异常的无损探测和对巷道围岩松动圈大小的探测,提出了用地质雷达测试松动圈的方法;概况总结了地质雷达在矿井生产中的应用。     

地质雷达测试技术在煤矿的应用

介绍了地质雷达的工作原理,雷达资料的处理和解释,以及地质雷达在煤矿井下的2项具体应用。对地质异常的无损探测和对巷道围岩松动圈大小的探测,提出了用地质雷达测试松动圈的方法;概况总结了地质雷达在矿井生产中的应用。     

地下管线及油污泄漏地质雷达正演模拟研究

在地下空间建设开发过程中,由于施工挖坏地下管线导致的工程事故频发,因此对地下管线及其泄漏物进行监测和评估具有重要意义。通过建立理想条件下地层结构模型,采用基于时域有限差分法（FDTD）的GPRMax程序,通过MATLAB编程对不同地下管线及油污泄漏情况进行地质雷达正演模拟,通过频谱分析得出管线及油污在雷达图像上的典型特征信号,给出了地下管线及油污泄漏的地质雷达探测信号分析基本原则。结合工程实例,验证了地下管线及油污泄漏地质雷达探测正演模拟和分析原则的可靠性。研究有助于对地下管线及油污泄漏实测雷达图像的解读,为相关工程应用提供参考。     

小波变换在地质雷达信号处理中的应用

地质雷达信号处理的关键是去除噪声提取有用信息。小波变换是近年发展起来的信号处理手段,通过设定不同的尺度参数,来提取不同空间域的信号。将小波变换用于雷达信号处理中,阐述了小波变换用于信号去噪的基本原理,实际应用结果表明,去噪效果良好,提高了信噪比。     

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     

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     

2014 second batch of rare earth quota released

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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     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.