改进AHP在大柳塔矿通风系统评价中的应用

为更合理的确定影响大柳塔煤矿通风系统影响因素的权重,通过分析其特点,并结合在试验平台的实践,建立了通风系统层次评价指标体系。在层次分析法(AHP)判断矩阵的构造上,采用3标度法对传统的9标度法进行改进,克服了9标度法采用模糊字眼表示两元素关系的困难,并运用matlab数值模拟快速确定了评价指标体系中准则层和子准则层各指标的权重。对比分析表明,改进AHP法提高了煤矿通风系统评价的效率和准确度,具有更强的实用性。     

基于模糊数学评价的矿山安全管理体系研究

以矿山安全管理体系为研究对象,将该体系分为三个评价指标层次,通过层次分析法建立管理评价体系,并采用1-9标度法确定各个指标权重,结合评价矩阵进行一致性验证,最后应用数学模糊评价法,得出有效的评价等级。为矿山安全管理体系的形成提供了一定的理论依据。     

基于博弈论-云模型的隧道围岩稳定性分析模型研究

为科学合理评估隧道围岩稳定性，考虑了隧道围岩安全具有随机和模糊性特点，引入云理论建立综合评价模型。首先，在分析和参考文献基础上，选取了6个影响因素，构建了隧道围岩稳定性综合评价指标体系。其次，基于三标度理论改进层次分析法确定指标主观权重，引入变异系数改进CRITIC法确定指标客观权重，采用博弈论确定指标组合权重；根据稳定性分级标准确定云的数字特征并生成了指标云图，分别计算各评估对象不同等级下的单指标隶属度和综合确定度，并基于最大隶属度原则确定等级。最后将模型应用到隧道围岩安全性评价中，并与可拓理论和属性识别评价模型对比，研究结果表明所建立的评价模型评估结果准确可靠、切合实际，对隧道施工具有一定的指导意义，为隧道围岩稳定性评估提供了一条可量化的新思路。     

基于主客观赋权-物元可拓模型优选岩爆倾向性预测方法

为了提高岩爆倾向性预测模型的可靠性,确保评价指标赋权方法的合理性,建立了基于主客观组合赋权的物元可拓岩爆倾向性预测模型。将9标度层次分析法、3标度改进层次分析法、构造标度改进层次分析法三种主观赋权方法分别与变异系数法（客观赋权法）组合,结合物元可拓理论建立三个岩爆倾向性预测模型,将模型分别应用于国内八项实际工程并对模型选优。结果表明：3标度改进层次分析法与变异系数法的组合赋权-物元可拓模型岩爆倾向性预测结果与实际情况一致,该模型为本文最优模型。     

某铜矿露天转地下采矿方法的AHP-FCE法优选

采矿方法的优选作为一种典型的多目标决策问题,其结果直接影响到地下采矿作业及相关工程建设,甚至是矿山的最终经济效益。针对某铜矿山即将由露天转向地下的开采现状,为保证其安全高效地可持续发展,从系统工程的角度对初选出的3种采矿方法进行综合评价。应用层次分析法综合考虑6种主要技术经济指标,并采用3标度法较科学合理地确定各指标权重,建立指标权重矩阵。同时,应用模糊综合评价法确定出采矿方法与各指标之间的模糊关系,并建立模糊关系矩阵。最后,将指标权重矩阵与模糊关系矩阵相结合,得到采矿方法关于各指标的综合隶属度。根据综合隶属度的大小,即可对采矿方法的优劣进行排序。排序结果表明,双上山房柱法为最适用于该铜矿山地下开采的采矿方法。     

AHP FUZZY在残采工程方案优选中的应用

为探讨太白金矿回收原采场边部残余低品位矿体的方案，通过层次分析法（AHP）与模糊数学（FUZZY）理论，选取对残采工程影响较大的9个因素，建立优选模型。运用层次分析法确定了各评价指标的权重；采用模糊数学法分析计算各采矿方法的定性、定量指标，分别得到各评价指标的隶属度。最终计算出3种工程布置方案的综合优选度分别为68.1%、69.3%、58.1%，从而沿矿体走向双进路布置确定为最优开采方案。实践表明，采用该模型优选的工程布置方案具有一定的科学性、合理性，值得借鉴与推广。     

基于模糊群决策的老采空区稳定性评价指标权重确定

为获得科学、合理的老采空区稳定性评价指标权重,提出了1种基于模糊群决策的赋权方法。首先定义模糊权重的语意标度,决策专家群根据领域知识确定各评价指标的模糊权重语意值,然后综合专家群的意见,将模糊权重语意值转换成三角模糊数,通过解模糊化得到模糊权重的明确值,最后归一化得到老采空区稳定性评价指标权重值。     

矿井通风系统评价指标权重确定方法对比研究

指标权重的确定是矿井通风系统评价过程中关键的一步。在评价指标体系确定的前提下,选取主观赋权法—层次分析法、客观赋权法—熵权法、主客观综合集成赋权法—结构熵权法来确定各指标的权重。对三种方法计算出的权重结果进行分析,运用层次分析法和结构熵权法得到的指标权重较相似;用熵权法通过信息熵得到的指标权重,与上述两种方法得出的权重有较大差异。该结果表明,对矿井通风系统进行正确的评价需要综合考虑评价方法与各方法计算的指标权重。     

改进的AHP法在岩石巷道围岩稳定性分析中的应用

针对岩石巷道围岩稳定性影响指标与回采巷道稳定性影响指标有较大区别的问题,采用改进的层次分析三标度法(AHP)对鲁班山北矿一采区回风上山围岩稳定性进行研究,通过建立评价指标递阶层次结构模型、求取指标权重,得出了鲁班山北矿一采区回风上山围岩为不稳定型的结论。     

基于AHP和模糊综合评价的焦家金矿岩体稳定性分级

为选择适合焦家金矿各矿区的采矿方法,对岩体稳定性进行分级。克服传统方法片面性,选取层次分析法和模糊综合评价方法相结合的方法,以焦家金矿-270 m中段为例,充分考虑各方面影响因素,建立综合评价指标体系。层次分析法确定各指标因素的权重向量,模糊数学原理和方法确定隶属矩阵,采用模糊综合评价法得出岩体稳定性综合评判向量为（0.052 1,0.556 2,0.246 9 ,0.135 4,0.009 4）,可确定此中段岩体较稳定,与矿山实际调查情况相同。     

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     

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.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new