千米立井的地压计算与探讨

本文在分析我国常用的立井地压计算方法的特点和存在问题的基础上,提出了孙村煤矿千米立井的地压计算方法,论述了这一计算方法的基本原理和计算程序,给出了该井筒的地压计算结果,并结合以往的工程实例和该井筒的施工情况对这一计算方法和计算结果的可信度作了理论上的探讨     

边坡有限元广义可靠度算法

针对可靠度理论中功能函数求偏导数和计算不收敛给有限元软件带来的问题和功能函数自变量之间存在着相关性这一问题,做了深入的研究并提出了一种新的可靠度计算方法即有限元广义可靠度。通过偏最小二乘原理,回归分析得到的功能函数沟通了有限元和广义可靠度,使两者有机结合,不仅能起到简化计算的作用,而且保证计算精度。本文还对二次可靠度计算原理应用于边坡计算给出了具体的量化表达式,并且结合灵泉露天煤矿[1]具体进行了实例计算。     

掘进机稳定性分析计算

简述了一种悬臂掘进机稳定性分析计算,并介绍了其主要计算方法。该悬臂掘进机稳定性分析计算主要包括行走时的稳定性计算和截割时稳定性计算。悬臂掘进机稳定性计算是设计中重要的设计要素。     

收益现值法计算矿产资源价值的分析

收益现值法是人们比较具有共识的一种计算矿产资源价值的方法 ,文中汇总归纳了现值法计算矿产资源价值的诸多计算模式 ,并进行了分析     

基于射线理论的地震波场模拟

该文针对地震波场的模拟问题,提出了一种基于射线理论的计算方法,走时采用差分格式进行计算,振幅采用Maslov射线理论计算,并对该算法的具体实现进行了详尽地描述,还对理论模型进行了试算。计算结果表明,方法是有效的。     

在Visual C++中调用MATLAB引擎进行有限元计算

与常用的采用有限元分析软件进行分析计算的方法不同,根据有限元的数值计算方法,编写特定的应用程序进行有限元计算来解决实际问题。介绍了在VisuaI C++中调用MATLAB引擎,利用MATLAB强大的数值计算功能进行有限元计算的一种简单方法。并给出了具体计算实例。     

用Excel处理导线计算问题

以一条实测双定向附合导线为实例,简要介绍了使用Excel软件进行导线计算全过程,给出了Excel计算程序和公式,对各种导线计算具有一定的现实指导意义。     

应用钻孔数据库圈定矿体并计算铀资源储量

储量计算是地质工作的基础,而矿体圈定又是储量计算的核心.通过应用钻孔数据库系统这个操纵平台,提高了储量计算的效率和精确度,有效地解决了计算繁琐和储量计算中矿体固定等难点问题.并提出了下一步改进方案,使之能运用到更广阔的地质领域中.     

岩石细观裂纹盒维数的计算机求解方法

为更好的描述岩石细观裂纹的复杂度,引入了一种新的盒维数计算方法,通过电镜扫描、图片处理、网格覆盖、程序计算4步对盒维数进行了求解,简化了分维计算的复杂性,提高了分维计算的速度和可靠性,实现了细观岩石裂纹分维计算的自动化,对工程应用有着重要的意义。     

也谈三角高程测量中地球曲率的改正

分析了“测量中地球曲率改正的严密计算方法”一文的严密计算公式,从光电测距和坐标反算两方面讨论了水平距离的计算,提出了曲率改正的实用计算方法。     

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