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。     

边坡碳质板岩原位剪切试验研究

岩石的参数是分析滑坡区稳定性状况的重要基础条件,以包钢巴润矿业滑坡区为工程背景,对主要由黑云母碳质板岩组成的松散岩体边坡进行稳定性研究。采用现场原位剪切试验、理论计算与数字图像处理技术相结合的方法,拟合原位剪切试验结果;基于最小二乘法确定现场岩体内摩擦角与黏聚力,分析原位剪切试验的节理面数字三维形貌,通过分形维数实现剪切结构面复杂程度的定量表征。结果表明,原位试验过程中,在0～1 MPa法向应力下得到的剪切应力,拟合优度为0.98;而文献[14]研究法向应力在3～14 MPa情况下的4组试验得到的剪切应力,拟合优度为0.75;剪切后的岩体在样品垂直方向120～240 mm产生剪切结构面,结构面发生剪断破坏的同时,伴随有剪胀破坏;剪切结构面形貌复杂程度较大,分形维数数值为1.68。原位剪切试验与图像形貌数学分析思路为现场岩体的物理力学参数预测与定量表征提供重要参考。     

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。     

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。     

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。     

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。     

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

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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.     

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     

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     

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.