豫东平原土层剪切波速与埋深关系分析

对豫东平原郑州市、开封市、新乡市、濮阳市、商丘市、周口市市区部分钻孔土层剪切波速测试数据进行了整理。采用线性函数方程、幂函数方程和一元二次函数方程建立了各市土层剪切波速与埋深之间的回归公式,采用拟合优度指标对回归分析结果进行评价。结果表明:郑州市、新乡市、濮阳市、商丘市的拟合优度比较高,达到0.90以上;而开封市、周口市的拟合优度比较低。以拟合优度作为评价指标,初步建立了各市土层剪切波速与埋深关系函数表达式。     

数字高程模型与等高线的三维一体化快速生成

介绍了三维虚拟环境中的数字高程模型与等高线一体化快速生成表达方法。首先讨论了基于移动拟合和移动加权平均两种算法快速生成数字高程模型的实现过程,提出在样点奇异区采用移动加权平均法替代移动拟合法插值可大大提高插值效率。论述了在三维可视化环境下数字高程模型与等高线一体化显示的原理和方法,重点对“三角面串序列法”进行了论述,并给出了其在流域治理规划应用中的实例。     

GPS高程拟合方法研究

当前工程测量中采用的高程为正常高,而GPS测量获得的高程为大地高,两者之间存在高程异常。为求解高程异常值,结合Matlab软件,对GPS高程拟合方法进行了研究。结果表明：①测区点位呈面状分布时,采用曲面拟合法更能反映测区的似大地水准面状况,其精度优于曲线拟合法;②BP神经网络拟合法的拟合效果较好,并且组合法的拟合精度优于单一拟合法的精度;③曲面拟合法、曲线拟合法、BP神经网络拟合法以及组合法的内、外符合精度均满足四等几何水准要求。研究表明,运用Matlab软件进行GPS高程拟合精度较高。     

趋势面法在屯兰矿瓦斯涌出预测中的应用

对屯兰矿回采工作面和掘进工作面瓦斯涌出量进行趋势面法预测,建立了趋势面预测模型,并对观测值与趋势面模型中各项的密切程度进行检验,用F分布检验分析趋势面模型对原始数据的拟合显著性。研究表明:回采工作面瓦斯涌出量预测模型预测的准确性在95.08%以上,完全能够满足矿井实际瓦斯涌出精度要求。     

GPS高程拟合方法的适用性研究

为研究各种GPS高程拟合方法所适用的不同范围,分别采用多项式拟合法、多面函数法、解析内插法对GPS测量点的高程进行拟合。针对地形起伏较大地区的高程点,计算出大地高和正常高之间高程异常的拟合残差,通过对各种方法计算的拟合残差的比对,探寻各种高程拟合所适用的条件。得出的结果表明:对于文中数据所反映的地形特点和数据点的布设方式,采用多面函数法具有较高的拟合精度、多面函数法拟合的平均误差较多项式拟合法减少37.5%,较解析内插法减少57.1%左右。不同的拟合方法有各自的特点以及适用范围和条件,对同一组数据采用不同的方法拟合,结果存在着很大的差异。     

基于广义延拓逼近法的煤矿通风机特性曲线拟合研究

提出采用一种新的广义延拓逼近法,来实现煤矿通风机高精度特性曲线的拟合。实例的拟合结果表明:与最小二乘拟合法和三次样条插值法相比,广义延拓逼近法在相同的插值次数条件下,具有更高的拟合精度。     

利用广义延拓法进行GPS精密钟差插值的实际效果

GPS精密钟差插值是精密单点定位中的一项重要工作,且其插值精度会直接影响到定位精度。针对传统内插和拟合方法的不足,采用广义延拓法将间隔为5min的GPS精密钟差插值到30s间隔,探讨其插值精度与三个参数之间的关系,并与传统插值方法作比较。结果表明:利用广义延拓法进行GPS精密钟差插值相比传统插值方法有优势,在参数r、t、s分别取2、3、4时该方法的插值精度比较理想,能够满足精密单点定位的精度要求。     

裂缝预测的构造曲率计算方法比较

构造曲率是研究裂缝的一种有效方法,它能够比较准确的反映和预测构造裂缝的发育。构造曲率的计算方法现在主要有趋势面拟合法和差分法,通过对两种方法在计算构造曲面的结果进行比较后得出,拟合法在分析大区域的构造曲率分布有很好的效果,差分方法则能够比较好的反映出一些局部构造的曲率变化。     

Sufer和ArcGIS软件在大屯矿区地面沉降危险性评价中的应用

运用Sufer和ArcGIS软件对大屯矿区地面沉降危险性进行评价,在评价过程中发挥了Sufer强大的插值功能和ArcGIS良好的图像处理功能。由评价结果可获得地面沉降对砖石结构建筑物破坏等级,以及各个等级的破坏面积。指出应根据不同破坏程度处理建筑物破坏问题。同时,为控制地面沉降,应控制超采地下水。     

基于数字钻探和机器学习预测岩体单轴抗压强度的方法

以岩体的单轴抗压强度为研究对象,采用传统数字钻探技术所建立的模型在低抗压强度阶段拟合优度不高。在传统模型的基础上引入钻压指数α、疲劳破碎阶段和表面破碎阶段总时间tp以及钻进系统旋转破碎单位体积能耗μp构建新模型,对岩体单轴抗压强度进行拟合。研究表明,在岩体质量较差的情况下,实际岩体单轴抗压强度与预测的岩体单轴抗压强度的拟合优度R2为0.7034,新模型的拟合优度R2为0.8807,对比表明在岩体单轴抗压强度低的情况下,新条件下的关系模型优于原关系模型。     

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.     

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     

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     

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.     

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,     

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     

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