基于IABC-ICA的随掘地震去噪方法

随掘地震是利用掘进机切割岩石产生的振动作为震源来进行探测,具有安全、简便、高效等优点,但随掘地震探测所采集的地震记录中波组成分复杂,有效信号能量弱,且被掘进机工作时产生的强噪声干扰,信噪比极低,去噪难度大,需要对随掘地震记录去噪方法进行研究。通过改进人工蜂群（IABC）算法搜索策略,提高了人工蜂群算法的收敛速度和收敛精度,将改进人工蜂群算法作为独立分量分析（ICA）方法的优化算法,提高独立分量分析方法的信噪分离效果。建立随掘地震超前探测地质-地球物理模型,给定加噪的变频变幅连续信号作为随掘地震震源子波,采用有限差分法进行数值模拟,得到随掘地震的地震记录,并在仿真地震记录中加入随机噪声;采用基于改进人工蜂群的独立分量分析方法（IABC-ICA）进行噪声与有效信号的分离,在此基础上利用互相关和脉冲反褶积方法进行压缩子波处理,得到与采用雷克子波震源模拟地震记录一致的波场特征,验证了该方法的去噪效果。结合现场试验的实测数据,进行IABC-ICA去噪、互相关、反褶积等处理,从信噪比较低的实际地震记录中提取了有效波信号。研究表明：基于改进人工蜂群的独立分量分析方法能够较好地分离随掘地震记录中的有效...     

分层鱼群优化支持向量机预测巷道围岩松动圈厚度

为了及时掌握巷道围岩松动圈的厚度,以便采取措施控制围岩的安全性,采用基于最大间隔算法的支持向量机进行预测。考虑支持向量机的性能很大程度依赖于参数的选择,提出改进的人工鱼群算法优化支持向量机的参数,以取得更好的准确度。首先对基本人工鱼群算法增加了种类分层和交叉变异,然后以此优化的参数对考查数据进行支持向量机回归预测。通过人工鱼群行为和参数的改进,扩大了搜索空间,增加了全局优化的稳定性,克服了人工鱼群后期寻优速度慢等问题。对某巷道围岩松动圈厚度监测与预测结果表明:该模型的预测精度较高,缩短了寻找参数的时间,泛化性能提高,收敛加快,可以有效地指导巷道围岩安全性的监测。     

人工蜂群算法求解带有启动时间的批量混合流水车间调度问题

针对目前制造业中广泛存在的带有启动时间的混合流水车间批量调度问题,设计了一种基于离散人工蜂群算法的调度方法。鉴于该问题的离散组合优化特性,提出一种批次分割与调度相结合的整数序列编码方式。采用扩展的NEH算法产生初始蜂群,同时改进雇佣蜂阶段邻域搜索方式和侦查蜂阶段产生新解的方式,在提高搜索效率的同时避免算法陷入局部最优。最后以实际生产数据作为算例,验证了算法对解决该类问题的有效性,对生产实践起到指导作用。     

基于改进神经网络的边坡岩体弹性力学参数识别方法

基于人工神经网络的BP算法，建立了根据边坡开挖后岩体位移观测数据识别岩休弹性力学参数的数值方法。在网络训练过程中采用改进的BP算法，通过对学习算法的优化探索。大大提高了网络的收敛速度，解决了BP算法迭代过程中目标函数振荡问题。通过算例表明，提出的改进的BPT算法有助于提高岩土材料参数识别收敛速度和识别精度。     

基于蜂群算法的煤矿救灾机器人全局路径规划

研究了一种基于人工蜂群算法的煤矿救灾机器人全局路径规划算法。该算法首先进行环境建模,然后根据环境信息特点,巧妙结合人工蜂群算法获得机器人全局优化路径。该路径规划方法具有建模方便、算法简单以及不局限于障碍物的形状等特点。实验证明,本算法可以快速有效地规划出一条全局较优化路径,是解决全局环境已知情况下机器人路径规划的一种有效方法。     

露天矿山运输调度系统粒子群优化

结合露天矿山运输调度系统实际，考虑到计划产量、生产能力、质量要求和运输过程等方面的约束，建立了一个通用性较强的露天矿山运输调度系统模型。该调度模型以总的运营成本最低为目标函数，采用惩罚函数法把诸多约束条件化为无约束，构建优化系统中粒子群算法的适应度函数。通过引入自适应变异程序对粒子群算法进行改进，避免算法过早收敛，提高了收敛效果。运用改进后的自适应变异粒子群算法对露天矿山运输调度系统模型优化求解，并采用Matlab软件对求解过程进行仿真，研究结果表明该算法能够快速得到当前班次的车辆调度的满意方案，提高了露天矿山运输调度的效率，进而提高露天矿山生产率，为数字化矿山建设提供一定参考。     

基于PSO优化改进的Snake模型煤矿环境目标检测

针对Snake模型寻优过程中抗噪能力差、不能向凹处收敛等问题,提出适合煤矿等复杂环境的目标轮廓检测新算法。算法对Snake模型进行改进,使其自动分配蛇点,具有拓扑自适应性,并将粗收敛结果作为粒子群算法的初始轮廓。同时针对粒子群优化过程中易丧失群体多样性和易收敛于局部极值的问题结合遗传算法中育种和变异思想改进,淘汰适应度...     

露天矿运输调度问题求解的自适应果蝇优化算法

针对露天矿运输调度问题,提出了一种改进的果蝇优化算法。首先,对露天矿运输调度问题进行了分析,以矿石开采能力和运输能力为约束条件,以运输成本最小为目标函数,建立了露天矿运输调度问题的数学模型。然后,该算法根据果蝇的味道浓度自适应调整搜索步长,同时满足了算法的全局寻优能力和局部寻优能力。最后,将自适应果蝇优化算法应用于求解实际的露天矿运输调度问题,与标准果蝇优化算法和遗传算法进行实验比较分析,给出了优化结果。实验结果表明:该算法的收敛精度和收敛速度均优于其他算法,证明了该算法可以有效求解露天矿运输调度问题。     

基于人工蜂群算法的中长期煤矿电力系统负荷预测

为提高中长期煤矿电力负荷预测的精度,将人工蜂群算法与灰色预测模型相结合,建立了改进的灰色预测模型。定义灰色预测模型中的变权缓冲的可变权重系数和背景值生成权重系数为蜂群搜索路径,以预测值与实际值的灰色关联度为目标函数,通过模仿蜜蜂采蜜行为在搜索范围内找出最大目标函数值的位置,通过灰色模型计算得到负荷预测值。最后利用MATLAB R2012a仿真和传统的灰色预测模型相比,得出该模型预测的误差更小,利用MATLAB R2012a仿真不仅提高了负荷预测精度,而且证明了改进后的方法是有效的、可行的。     

改进GWO-BP算法的概率积分法预计参数求取

针对BP神经网络模型在求取概率积分法预计参数时的缺陷,提出了一种基于改进灰狼优化算法(GWO)的BP神经网络参数预测模型。主要通过对灰狼算法的收敛因子a进行非线性收敛的改进,再利用粒子群算法(PSO)的速度更新公式更新搜索灰狼搜索位置。用改进的灰狼优化算法对BP神经网络的初始权值和阈值进行优化,然后利用最优的初始权值和阈值对模型进行训练和预测,从而得到概率积分法参数的预测结果。结果显示经过改进的灰狼算法优化BP神经网络的参数预测结果明显优于单一的BP神经网络模型和不改进的灰狼算法优化BP神经网络模型的预测结果,可以在矿区开采沉陷预计方面得到应用。     

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     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.     

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