基于灰色聚类分析—模糊综合评价的矿井通风系统综合评价

在广泛调查分析影响矿井通风系统运行的主要因素基础上,采用多目标决策的原理和方法,构建了矿井通风系统综合评价指标体系。利用灰色系统理论中的灰色聚类分析和模糊综合评价方法,建立了矿井通风系统综合评价模型,从而定量化地解决了矿井通风系统通风效果的评价等级。以唐山沟煤矿为例对其进行了评价,通过该评价方法得到的结果与现场实际情况完全一致。     

基于层次分析法的矿井通风系统灰色综合评价

通过分析影响矿井通风系统的主要因素,确定了煤矿通风系统评价指标体系,采用层次分析法和灰色综合评价相结合的原理和方法,构建了煤矿通风系统评价模型;利用层次分析法,将成对比较矩阵的特征向量作为煤矿通风系统评价因子的权重,通过数据序列之间的灰色关联关系,建立灰色关联矩阵,以量化的方式准确地计算出各指标的影响力排序,最终指出影响矿井通风系统的主要因素。     

矿井通风系统的灰色综合指数评价法

本文以新兴的灰色系统决策理论为工具,并利用层次分析法,在建立表征矿井通风系统状态和质量的主要因素指标的基础上,结合靖远矿务局王家山诸矿井实例,探讨了矿井通风系统的灰色综合指数评价问题。从而为加强矿井通风系统的目标管理和优选矿井通风方案,提供了科学的方法和依据。     

矿井通风系统安全性综合评价及优化实践

根据矿井通风系统的特征建立矿井通风系统安全评价体系,确定评价指标;运用灰色系统理论和层次分析法的知识对评价指标进行优选和量化;利用安全度理论对矿井通风系统进行安全性分析。结合山东某矿实例对矿井通风系统安全性进行分析,得到安全度值S=53.68,并提出相应措施进行优化最终得到安全度值S=85.32,使得矿井通风系统处于安全状态。     

矿井通风系统安全评价方法综述

我国的矿山企业安全生产形势严峻,事故多、伤亡大、经济损失严重,尤其是重、特大事故频繁发生。安全评价技术及其应用是预防和控制事故的重要内容,对模糊综合评价法(FCE)、层次分析法(AHP)、基于灰色系统理论评价方法、基于未确知测度理论评价法、基于人工神经网络理论(ANN)的安全评价方法以及评价方法综合集成等矿井通风系统安全评价方法进行了分析和比较,提出了开展基于方法集的综合集成评价的研究和建立综合集成评价的决策支持系统是矿井通风系统安全评价研究的发展趋势。     

矿井通风系统的灰色分析

运用灰色系统理论分析了矿井通风系统评价指标对系统的关联度，并采用层次分析法确定各指标的权重值。依分析结果对若干个矿山的矿井通风系统作了灰加权关联分析，确定出各通风系统的优劣。     

矿井通风系统模糊综合评价

矿井通风系统是影响煤矿正常生产的重要因素。本文利用层次分析法和模糊聚类分析,对矿井通风系统的安全性进行综合评价,评价结果量化了通风系统的安全等级,为矿井改善通风系统明确了方向,保障了工作面的安全生产。     

矿井通风系统模糊综合评判及软件开发

如何保障矿井通风系统的稳定性和安全性,建立一套符合实际的体系,已成为矿井生产的一个重要的任务。为了客观评价通风系统,将模糊综合评价与层次分析法相结合,建立了矿井多级模糊综合评价模型。采用C#面向对象语言及SQL2005数据库系统,开发了矿井通风系统评价软件。     

灰色关联度在煤矿通风安全评价中的应用

矿井通风系统的灰色性包含随机性和模糊性，还包括这2种不确定性以外的更为广泛的特性，如信息的不完全性和非确定性。采用灰色关联度评价法对矿井通风系统进行评价，有效地弥补了模糊综合评判法的不足，使评价结果更为客观、合理，在评价过程没有丢失信息的观象。     

基于层次模糊法的矿井通风系统安全评价软件设计研究

复杂的通风系统网络降低了煤矿通风系统的安全性和稳定性,影响并制约着矿井下一步的开采进度。首先,运用层次模糊综合评价理论构造数学模型,结合矿井实际从环境、设备、监管及经济技术可行性4个层面构造14项指标评价体系,并对各指标作定性与定量分析进行等级划分,得出该矿井通风状况隶属一般;最后,利用上述数学模型为安全评价计算机软件建立评价系统,且提供界面设计参考,为矿井通风系统的安全评价软件开发奠定基础。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。