基于混合属性的煤矿安全管理效率测评方法

为了对存在着实数及模糊数等混合属性指标值的煤矿安全管理效率进行测评,提出了混合属性广义灰靶决策方法。该方法将各类型指标值统一转化为二元联系数向量,然后计算各指标向量与靶心指标向量的接近度,并经归一化获得加权集成的接近度来确定决策方案的优劣。以泉店煤矿为例对其6个不同月份的安全管理效率进行测评,结果证实所提出的决策方法能够较好地解决混合属性煤矿安全管理效率的测评问题。     

基于组合权重的尾矿库重金属污染性灰靶评价

针对尾矿库的重金属污染对生态环境及人类生活造成严重危害的状况,以辽宁省境内6个不同矿区的尾矿库作为研究对象,采用灰靶决策的方法,对其污染性进行量化研究及评价。系统分析不同重金属元素对环境的污染性,选取Zn、Pb、Cd、As、Cu、Cr、Hg共7种重金属元素,建立尾矿库重金属污染性评价指标体系。运用层次分析法和熵权法确定评价指标的主、客观权重,通过组合权重模型得到各评价指标对尾矿库污染性影响的最终组合权重值。基于灰色系统理论,建立多指标尾矿库重金属污染性灰靶决策模型,以污染临界值作为最优效果向量,即灰靶决策模型的靶心。计算6个待评价区块的效果向量与最优效果向量间的靶心距,根据靶心距的大小进行污染性排序,靶心距越大,矿区污染程度越严重。评价结果与实际情况较吻合,说明基于组合权重的多指标尾矿库重金属污染性灰靶决策模型对尾矿库的污染性进行评价是可行的。     

基于变权综合灰靶模型的采空区风险等级评价

采空区风险等级评价是采空区灾害监测、预防和治理的重要内容。基于灰靶理论,采用灰熵关联分析法,引入平衡函数确定指标综合权重,建立了基于变权综合灰靶模型的采空区风险等级评价方法;选取8个评价指标,构建了采空区风险等级评价指标体系;根据变权综合灰靶模型,计算得到靶心距,形成了定量化的采空区风险等级靶距图,然后以检验样本的靶心距在靶距图上的分布确定其风险等级。利用5个检验样本对变权综合灰靶模型进行了验证,评价结果与实际风险等级一致。同时,将基于灰熵关联分析方法与变权综合权重计算方法的灰靶模型评价结果进行对比,证明了变权综合灰靶模型的合理性和准确性。结果表明,采用变权综合灰靶模型对采空区进行风险等级定量化评价是合理可行的,可作为采空区灾害治理工程指导和管理的决策依据。     

基于灰色决策法的首采区位置优选

通过灰关联决策法,构造决策方案集,确定理想最优效果向量,并利用灰靶决策法求出各方案的效果向量与理想最优效果向量的靶心距,选择最优方案,进而确定合理的首采区位置。实例应用结果表明:灰色决策法简单易行,具有很大的实用价值。     

基于灰靶决策模型的煤与瓦斯突出可能性评价

基于灰色系统理论,建立多指标加权灰靶突出可能性决策模型,对矿井煤与瓦斯突出的可能性进行量化评价。根据10组煤与瓦斯突出危险区域测点数据与预测煤层突出危险性单项指标临界值的靶心距的大小,对矿井突出可能性大小进行评价,并进行了突出可能性等级划分。应用该模型对花宝沟煤矿煤与瓦斯突出的可能性进行评价,评价结果是靶心距距离较大,可能性小,不易发生突出,评价结果与实际情况一致。说明应用多指标加权灰靶突出可能性决策模型对矿井进行煤与瓦斯突出危险性评价是可行的。     

基于博弈-灰靶模型的岩爆烈度等级评价

岩爆一直是深部高应力地下工程面临的一大难题，为了有效预测和评价地下岩体工程的岩爆灾害，建立了基于博弈论组合赋权-灰靶决策的岩爆烈度等级评价模型。首先，选取岩石单轴抗压强度与抗拉强度的比值σ_c/σ_t、切向应力与单轴抗压强度的比值σ_θ/σ_c、弹性变形能指数W_et和完整性系数K_v等定量化指标建立评价指标体系，运用Critic法、变异系数法和熵权法分别计算出各个指标的权重，再根据博弈理论对权重进行优化，进而确定博弈论组合赋权；然后，结合灰靶决策理论，建立不同岩爆烈度等级的综合靶心距分布集；最后，通过综合靶心距的大小对岩爆烈度等级进行判定。为验证所建模型的准确性和合理性，以终南山公路隧道工程为例，根据实测数据对该评价模型进行实例分析。研究结果表明：基于博弈-灰靶模型的岩爆评价结果与实际岩爆情况基本一致，说明该岩爆烈度等级评价模型有较好的精准性和可靠性。     

基于灰靶决策理论与粗糙集的采矿方案优选

针对采矿方案的选择由多项指标决定,而各指标之间的物理意义又各不相同,建立了基于灰靶决策与粗糙集的采矿方案优选分析体系模型.根据各方案的效果向量,选出理论最优方案,然后测算出各方案与理论最优方案的靶心距,通过比较得出实际最优方案,并根据粗糙集理论,对指标因素进行了约简,并进行了反算验证.实践证明,该模型对于采矿方案的优选与分析是切实有效的,可以进行推广使用.     

基于灰靶决策与优势关系粗糙集的采矿方案优选

采矿方案的选择由多项指标决定,而各指标之间的物理意义又各不相同,因此建立了基于改进灰靶决策与优势关系粗糙集的采矿方案优选分析体系模型。利用灰色效果测度将各指标因素数据进行去量纲化,根据灰色效果测度结果,选出理论最优方案,然后利用灰靶决策理论测算出各方案与理论最优方案的距离,通过比较得出实际最优方案,并根据优势关系粗糙集理论,对方案选择的规律进行分析。实例验证了该模型对于采矿方案的优选与规律分析是切实有效的,可以推广使用。     

运用模糊综合评判法评价煤层底板突水危险性

对煤层底板奥灰水害严重制约着煤矿安全生产问题,对煤层底板突水进行评价、预测具有重要意义。分析煤层底板突水的影响因素,作为危险性评价指标,采用模糊综合评判法处理各指标间的模糊关系,运用层次分析法将定性问题定量化,确定各影响因素的权重,建立模糊综合评判模型。用该模型对酸刺沟煤矿6上119工作面进行煤层底板突水危险性评价,评价结果可以为底板奥灰水害防治提供一定依据,来保证工作面的安全回采。     

矿业工程项目投资价值和投资决策的期权方法

矿业工程项目的投资受到许多不确定因素的影响，这些不确定因素给矿业投资带来投资机会的价值，传统的净现值(NPV)法对工程项目的评价未考虑这些不确定因素的影响。在充分研究了矿产品价格的运行模式和矿业投资项目成本和收益的不确定性的基础上，应用实物期权理论和方法，建立了矿业工程项目投资价值评价和投资决策模型，为矿山投资决策提供了新的思路和决策方法。     

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