回采巷道围岩稳定性的神经网络控制

建立了煤矿回采巷道围岩分类与支护设计人工神经网络（ＢＰ网络）模型及巷道变形预测二级神经网络模型，并通过网络自适应、学习与匹配联想，得出了巷道围岩类别与支护强度及支护方式相对应的结果。同时，通过巷道变形预测二级神经网络模型预测了巷道顶底板移近速度，两帮移近速度及围岩动态。试验表明，神经网络（ＮＮ）输出结果与实际拟合良好。     

回采巷道围岩稳定性的神经网络控制

建立了煤矿回采巷道围岩分类与支护设计人工神经网络（ＢＰ网络）模型及巷道变形预测二级神经网络模型，并通过网络自适应、学习与匹配联想，得出了巷道围岩类别与支护强度及支护方式相对应的结果。同时，通过巷道变形预测二级神经网络模型预测了巷道顶底板移近速度，两帮移近速度及围岩动态。试验表明，神经网络（ＮＮ）输出结果与实际拟合良好。     

BP神经网络在巷道围岩力学参数反分析中的应用

针对鲍店煤矿巷道围岩的特点,提出一种基于BP神经网络,可采用巷道围岩力学参数与巷道位移变形之间的非线性关系的围岩参数反分析方法,反演的围岩参数代入数值模型后与实测值比较,结果误差小、精度高。     

神经网络在锚杆支护方案优选及变形预测中的应用

根据综放回采巷道的特征,确定其锚杆支护形式优选需要考虑的因素为：围岩强度、煤层强度、巷道埋藏深度、围岩节理裂隙发育程度、采动影响、顶煤厚度、护巷煤柱宽度、巷道断面面积,这些因素和支护形式、支护参数一起对巷道围岩变形产生影响.根据巷道支护方案和围岩变形与其影响因素为非线性关系的特点,建立了综放回采巷道支护方案优选和围岩变形预测的神经网络模型,为支护设计和生产管理提供科学依据.     

人工神经网络方法辨识岩体力学参数的可辨识性及其稳定性探讨

探讨了以巷道围岩变形观测为依据 ,用神经网络反推岩体物理力学性质和初始地应力环境参数时各参数的可辨识性 ,以及参数辨识的稳定性。找出了待辨识参数个数与所需最少巷道变形观测项目数之间的关系 ,并给出了巷道围岩变形观测项目选择的建议     

神经网络理论在预测巷道围岩变形中的应用

利用神经网络理论对巷道围岩变形预测问题进行了探讨，与利用灰色模型预测巷道围岩变形的结论作了比较。通过计算机模拟，构造了〔７～１〕ＢＰ模型神经网络模型。结果表明，这种方法是可行的，且有较高的精度。这一模拟的成功，说明神经网络理论是能够应用于工程实际的。     

软岩锚注巷道围岩变形量的时序预测

为反映软岩锚注巷道围岩的变形在时间上的变化规律，利用径向基函数RBF神经网络强大的非线性映射能力，通过已经观测到的巷道围岩变形数据，建立软岩锚注巷道围岩变形量的时序预测模型．利用训练好的模型和当前观测数据得到了软岩巷道在锚注之后3，9，15及30d的顶底变形量和两帮相对变形量．实例分析表明，该预测模型能弥补现场观测和数值模拟的不足，预测结果具有较高的精度．同时也说明锚注支护能有效控制软岩巷道围岩的变形．     

组合优化模型在巷道围岩变形监测中的应用

将灰色GM(1,1)模型、回归分析法和神经网络模型的预测结果结合起来,以各种模型误差平方和最小为基准,进行加权优化组合,建立了组合优化预测模型并将该组合模型应用到巷道围岩变形监测中。经过实验分析与对比,验证了组合预测模型在巷道围岩变形预测中优于单一的预测模型,也是提高巷道围岩变形预测的一种有效方法。     

寺河矿采区巷道修复收敛变形分析及发展趋势预测

寺河煤矿采区巷道围岩条件差有时会发生严重破坏,这影响正常的煤矿生产,并容易产生安全问题。文章根据寺河煤矿采区巷道的多种支护情况,通过收敛变形记录对神经网络模型进行训练,建立了相适应的BP神经网络预测模型。通过该神经网络模型成功预测修复后巷道的收敛变形发展情况,预测结果与实测值相似度达85%以上。     

基于BP网络的采矿巷道围岩力学参数反分析

为较理想地处理巷道的收敛变形与围岩力学间的复杂非线性关系,应用反分析方法研究了大冶铁矿龙洞-74 m水平采矿巷道的围岩力学参数.首先应用正交试验理论确定有限元正分析的围岩力学参数取值样本,运用2D-Sigma有限元软件计算巷道的收敛变形值;然后将有限元计算位移值作为输入样本,相应的围岩力学参数作为输出样本训练BP神经网络;再将实测位移带入训练好的神经网络反分析得到相应围岩力学参数,以此围岩力学参数作为二次正分析的计算参数进行有限元计算,并比较分析位移计算值与实测值的误差.结果表明,采用该方法获取围岩力学参数是可行的,其结果符合工程实际要求.     

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.