开拓系统优化选择的灰色局势决策

地下矿山开拓系统选择是一个多目标多属性的决策问题，而传统选择方法对影响开拓系统选择的各因素只做定性分析，因此，本文采用灰色局势决策方法对蒙阴戴蒙金刚石开拓系统选择的各影响因素进行定量处理，确定出各方案的相对优势比，结果表明了方法的可靠性和实用性。     

模糊层次分析法在金刚石矿开拓系统优化选择中的应用

针对传统选择方法对影响开拓系统选择的各因素只能做定性分析的缺陷，本文采用模糊层次分析法(FHAP)对蒙阴戴蒙金刚石矿开拓系统进行优化选择，使定性分析与定量分析相结合，结果表明了方法的可靠性和实用性。     

模糊层次分析法在开拓系统优化选择中的应用

以大新锰矿为例,利用模糊层次分析法来建立开拓系统优化选择模型,首先从众多影响开拓系统中选取8个较为重要的因素,再利用层次分析法确定各因素的权重,最后采用模糊决策评选出最为合适的开拓系统.结果表明,采取该模式选取的开拓系统具有一定的科学性和实用性.     

模糊决策在采矿方法选择中的应用

本文应用模糊决策理论，从分析影响采矿方法的因素入手，在选择采方法时，进行模糊决策选择最优方法。具体的方法是选择矿石性质、矿体产状、矿石价值、有用成份等各因素。进行采矿方法的初选。通过技术经济分析和综合分析比较，最后用多目标决策进行最终选择，为选择采矿方法提供一种较实用的方法。     

矿井开拓方案选优的多目标模糊优化决策方法

针对方案比较方法在具有多指标因素的矿井开拓中选择最优方案存在的不足，认为宜用多目标决策方法进行方案的综合评价，以确定其最优解。但多目标决策存在着指标权重计算繁琐的问题，为补充完善，给出一种模糊确定指标权值的多目标模糊优化决策方法。该方法具有简明实用和易于操作的优点，是一种科学有效的决策方法。     

模糊优选理论在矿井开拓方案选择中的应用

矿井开拓方案的合理与否直接影响矿井生产的安全及效益,开拓方案优选受多种定性因素和定量因素的制约,使方案同时达到技术最优、成本最低、最安全可靠几乎是不可能的。为了克服方案确定的盲目性和主观性,应用复杂系统多目标决策模糊优选理论,首先对定性因素两两定量化评价,并根据其贡献大小确定各因素权重,最后用模糊优选与模糊模式识别两种方法对方案进行优选,此种方法综合权衡了多因素对结果的影响效果,避免了单因素决策的片面性和主观认识的局限性,能较客观的反映实际和人们对事物的评价。     

应用多目标决策法选择立井位置

在井田开拓中，影响立井位置的因素有矿床的地质构造、储量、灰分等。应用多目标模糊决策理论，根据具体矿井条件，建立了多目标模糊决策矩阵，对矿井立井位置的确定提供了一种优化决策方法。     

采矿方法优化选择的灰色方案决策分析

地下采矿方法选择是一个多目标多属性的决策问题,采用灰色方案决策方法对蒙阴戴蒙金刚石矿采矿方法选择的各影响因素进行定量分析,合理地确定出各方案的相对优势比,决策结果表明了该方法的可靠性和实用性。     

采矿方法选择的灰色局势决策

为科学地选择地下矿山采矿方法，综合考虑经济效益计算中的参数确定风险及经济效益计算以外的安全等因素，将灰色局势决策方法引入地下矿山采矿方法的选择，对采矿方法选择中的各影响因素进行定量处理，确定出各方案的相对优势比。     

开拓系统优化的AHP-熵权法和灰色关联分析

开拓方案的选择对地下矿山开采具有关键性的作用,而影响开拓方案选择的因素众多,且影响程度不一。为避免个人主观认识差异及客观数据之间关系的片面性对开拓方案选择结果的影响,提出了基于AHP-熵权法和灰色关联分析的开拓系统评价方法。在评价过程中,综合考虑了影响开拓方案选择的定性、定量指标,将AHP法和熵权法结合,确定了评价指标的综合权重,通过灰色关联分析得到了最优开拓方案。矿山实践表明:该方法得出了可靠评价指标权重及评价结果,且计算过程简单,评价结果直观,是一种科学合理的评价方法,为开拓方案的优化选择以及其他系统工程的多方案优选提供了一条新的途经。     

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