谦比西铜矿矿岩稳定性的模糊物元评价

基于模糊物元理论,选择合理的岩石稳定性评价指标,通过隶属度计算,建立了岩石稳定性评价的模糊物元模型。为避免权重确定的主观性,采用求和归一法来确定评价指标的综合权重,最后根据关联度计算结果及最大关联度原则,实现了对谦比西铜矿井下围岩稳定性等级的多指标综合评判。结果表明：采用模糊物元理论进行岩石稳定性评价是有效可行的,为岩体稳定性评价提供了一条新的思路。     

地下开采矿岩稳定性的模糊灰元评价

将模糊灰元与矿岩稳定性评价相结合, 从地下开采的角度选取能够反映矿岩稳定性的参数进行评价。在模糊物元理论、灰色系统理论和关联函数运算的基础上, 建立了矿岩稳定性评价的模糊灰元模型, 经关联变换及从优隶属度处理构造关联系数模糊灰元。采用求和归一法与熵值法相结合确定评价指标组合权重系数的方法, 通过关联度计算和最大关联度原则, 对开阳磷矿沙坝矿矿岩稳定性等级和优劣排序进行了模糊灰元评价, 取得了令人满意的结果。     

地下采场作业环境安全等级的CM-AHP评价

在风险因素分析的基础上,确定10个评价指标要素,建立综合评价指标体系。采用耦合CM-AHP的赋权方法,构建了地下采场作业环境安全等级的云模型评价模型。研究结果表明:基于CM-AHP模糊赋权的地下采场作业环境安全评价,以云模型表征其指标要素权重,可有效保留评价指标权重的模糊性和随机性;通过云模型评语集直观地刻画作业安全等级,为含有多指标模糊因素的评价提供了一种有效方法。以某金矿地下采场作业环境安全评价为案例,构建了云模型模糊评语集,结合评价云模型认为该矿地下采场作业环境安全等级为安全,与实际情况相符。     

模糊物元模型在采煤沉陷区稳定性综合评判中的应用

建立了采煤沉陷区稳定性模糊物元综合评判模型。利用模糊物元理论,将采煤沉陷区的稳定性视为物元事物,以影响该事物的各项评价指标及其相应的模糊量值构造复合模糊物元,采用层次分析法计算各评价指标的权重,再结合贴近度概念构建评价模型,实现采煤沉陷区的稳定性评价。     

考虑回采巷道尺寸影响的铲运设备选型

在铲运设备选型中,为了考虑回采巷道尺寸的影响,确定不同方案的巷道尺寸后,根据Q分级理论初步选择支护方式,建立数值模型模拟分析采场应力分布情况和安全系数。选取5种方案下采场的最大主应力、最小主应力、安全系数的最小值、铲运机的出矿台班效率和支护费用构成评价指标体系,建立铲运设备优选的模糊物元分析模型,采用变异系数法求取各评价指标的权重系数,最后得出5种方案的关联度分别为0.836 1,0.820 9,0.759 6,0.8632,0.839 4,按最大关联度原则,确定方案D(斗容为5 m3)为最优的铲运设备。评价结果表明:在铲运设备选型中考虑回采巷道尺寸是更加符合矿山生产实际的,同时运用模糊物元分析模型来进行铲运设备选型是可行的。     

基于可拓学理论的采场顶板稳定性评价

可拓学作为一种处理不相容问题的新理论。在工程领域正逐步得到广泛应用。利用该理论建立了地下矿山采场顶板稳定性评价的物元模型,对大厂铜坑矿92号矿体实际采场顶板稳定性进行了评价。通过简单关联函数确定权重及关联度的计算,取得了客观合理的评价结果。证明了可拓学理论在复杂的岩体工程评价中的有效性和可行性。     

基于改进物元可拓法的滨海金矿涌水风险评估模型研究

针对滨海金矿涌水具有随机性和不确定性的特点，引入物元可拓模型，建立综合评价模型。首先，考虑了工程地质和水文地质两个方面，选取包括RQD值等10个指标构建了滨海金矿涌水风险综合评价指标体系；其次，采用改进层次分析法和改进CRITIC法分别确定指标主观和客观权重，基于博弈论计算指标的综合权重，通过计算指标层、准则层和指标关联度和综合关联度，基于最大隶属度原则，判断最终的风险等级；最后将模型应用到三山岛金矿涌水风险评价中，并与云模型评价模型结果对比。研究表明，建立的综合评价模型与云模型理论评估结果一致，且与现场调研情况相符合，计算结果合理可靠，可以为滨海金矿涌水风险评估提供一条新思路。     

边坡稳定性评价的组合赋权博弈论云化物元模型

针对露天矿山边坡工程稳定性具有模糊性和随机性特点,为解决研究过程中单一的主客观赋权法计算的权重失衡进行影响评估结果可靠性的问题,提出了博弈论与云化物元相结合的露天矿山边坡稳定性综合评价方法.从岩体力学性质、环境条件和工程条件３个方面,选取了１２个因素,构建露天矿山边坡稳定性综合评价指标体系,建立边坡稳定性评估的博弈论 云化物元综合评估模型;将所建立的综合评价模型应用到３个露天矿山边坡稳定性评估中,采用 G１法和改进 CRITIC法分别计算指标主客观权重,并基于博弈论思想确定指标综合权重;根据云化物元模型原理,计算单指标关联度和综合关联度,基于最大隶属度准则,对边坡稳定性等级进行综合分析判断,并将评估结果与未确知测度和属性测度模型评估结果进行比较来验证模型准确性.研究表明,３个露天矿山边坡稳定性等级分别为Ⅲ级、Ⅱ级、Ⅲ级,与实际情况相符,且３种评估模型评价结果完全一致,验证了博弈论 云化物元模型在露天矿山边坡稳定性评估的适用性.     

物元模型在煤层顶板稳定性评价与预测中的应用

为了正确预测煤层顶板的稳定性和危险性,根据影响煤层顶板的稳定性分类的一些主要因素,应用物元理论建立了煤层顶板的稳定性判别与预测模型:给出了煤层顶板的稳定性评价的物元关联函数及物元关联度的计算方法;建立了适合可拓学理论的煤层顶板的稳定性等级分类标准;采用指标的综合权重,充分利用主观赋权法和客观赋权法各自带来的信息。应用结果表明,该模型适合于煤层顶板稳定性的评判和预测。     

基于模糊物元模型的矿房回采顺序方案优选研究

以某矿山矿体开采为研究对象,提出了波浪型开采、倒V型开采和斜线型开采等3种回采方案。利用FLAC^3D对3种方案进行回采顺序模拟,给出了各方案回采顺序对采场应力、位移以及塑性区的影响趋势。在此基础上选取最大主应力、最大拉应力、顶板沉降位移、底板鼓起、边帮水平位移和塑性区体积共6个评价指标构建了模糊物元评价模型,采用变异系数法确定各指标值的权重,最终确定3种方案的关联度分别为0.9190,0.9774,0.9251,按照最大关联度原则确定了倒V型开采方案为最优方案。该研究思路可为类似矿山提供参考。     

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

正~~     

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.