VCR法采矿工程中矿石损失与贫化的控制与研究

交叉巷道暴露面积大,VCR采矿方法在我国的大型金属矿山中应用较为广泛,该种采矿方法优点是:矿块结构简单,不用掘进切割天井和切割槽,切割工程量小;生产能力大,采矿成本低,经济效果好;工艺简单,各项作业可以实现机械化;应用球状药包爆破,充分利用能量,爆破效果好,大块率少;缺点是:要求高密度、高爆速和低感度的炸药,成本比较高;对凿岩的精度要求高,孔深在50-60m之内,炸药爆破时工序复杂,工人体力劳动强度较大,机械化不易事项;矿房超挖量大,导致充填成本提高,同时造成矿柱回采难度增加,特别是在矿体形态变化大时,损失贫化率较高。因而如何降低VCR法采矿工程中损失与贫化率是现代采矿工程技术人员迫在眉睫的事,那么我们主要从降低单个采场的超挖量与降低矿柱回采综合成本入手,难点在于矿房回采的布孔参数及爆破参数的确定。本文通过这几年的矿山实践与应用,单个采场的边界孔的布孔参数调整,以及不耦合系数与线装药成反比关系,根据不耦合装药理论,爆炸压力随着不耦合系数值的减小而增大,而破坏矿柱岩壁。从以上两处入手来控制矿石的损失与贫化率,为企业创造出更多的经济效益。     

塔河4区碳酸盐岩缝洞型油藏周期注水实践及认识

塔河4区奥陶系油藏是以发育大规模溶洞为主的碳酸盐岩缝洞型油藏,2005年开展注水开发以来,稳定见效期5-6年。2011年开始注水效果变差,注采井组水窜严重,递减明显加大。本文针对注水效果变差的现状,从周期注水机理入手,总结了周期注水参数优化、不同缝洞及注采连通关系周期注水方法,周期注水有效改善了区块开发效果。     

基于圆和圆环点的摄像机线性标定

本文提出了一种基于圆和圆环点的线性自标定方法。该方法的平面模板要求圆内有3组两两正交的直径,从3个或多个不同的方位摄取平面圆模板的图像。根据射影几何调和共轭和交比不变的性质,求出6条直径灭点的坐标。由3组两两正交的直径和拉盖尔定理的推论解出圆环点的图像坐标。利用圆环点的性质得到关于内参数的约束方程,从而线性的求出摄像机的5个内参数。模拟和真实图像实验表明,该方法精确度较高,鲁棒性较强,有一定的实用性。     

Impact of uncertainty on high frequency response of the U.S. stock markets to the Fed's policy surprises

This paper examines the impact of uncertainty on estimated response of stock returns to U.S. monetary policy surprise. This is motivated by the Lucas island model which suggests an inverse relationship between the effectiveness of a policy and the level of uncertainty in the economy. Using high frequency daily data from the Federal funds futures market, we first estimate the response of S&P 500 stock returns to monetary policy surprises within the time varying parameter (TVP) model. We then analyze the relationship of these time varying estimates with the benchmark VIX index and alternative measures of uncertainty. Evidence suggests a significant negative relationship between the level of uncertainty and the time varying response of S&P 500 stock returns to unanticipated changes in the interest rate. Thus, at higher levels of uncertainty the impact of monetary policy shocks on stock markets is lower. The results are robust to different measures of uncertainty.     

Exact confidence sets and goodness-of-fit methods for stable distributions

Usual inference methods for stable distributions are typically based on limit distributions. But asymptotic approximations can easily be unreliable in such cases, for standard regularity conditions may not apply or may hold only weakly. This paper proposes finite-sample tests and confidence sets for tail thickness and asymmetry parameters (α$\alpha$ and β$\beta$) of stable distributions. The confidence sets are built by inverting exact goodness-of-fit tests for hypotheses which assign specific values to these parameters. We propose extensions of the Kolmogorov–Smirnov, Shapiro–Wilk and Filliben criteria, as well as the quantile-based statistics proposed by McCulloch (1986) in order to better capture tail behavior. The suggested criteria compare empirical goodness-of-fit or quantile-based measures with their hypothesized values. Since the distributions involved are quite complex and non-standard, the relevant hypothetical measures are approximated by simulation, and p$p$-values are obtained using Monte Carlo (MC) test techniques. The properties of the proposed procedures are investigated by simulation. In contrast with conventional wisdom, we find reliable results with sample sizes as small as 25. The proposed methodology is applied to daily electricity price data in the US over the period 2001–2006. The results show clearly that heavy kurtosis and asymmetry are prevalent in these series.     

江西大江边矿区复杂地层钻探施工技术探讨

大江边矿区位于萍乐聚煤盆地的西南端。矿区内地质构造复杂,断层发育,施工难度大。文章通过对该矿区各类资料的总结和分析,从改变钻进工艺,选择合适的工艺参数和冲洗液配方等方面入手,有效维护孔壁稳定性,降低生产成本并提高钻探效率,为今后地层复杂矿区施工提供了理论依据。     

市场化进程对地区工业经济发展的作用机理研究

本文采用1995-2003年中国大陆各省工业生产、市场消费和对外出口的有关数据，选择与非参数生产率指数测度方法结合的半对数线性Paneldata计量模型，研究了国内市场需求和国际市场需求对中国省际工业经济发展的影响，旨在揭示国内市场的一体化趋势和对外开放对区域经济差异化的作用机理。实证分析的结果表明，伴随国内市场一体化程度的提高，市场需求因素的拉动作用已呈现显著提高的态势，各地区工业经济的发展由分割的地方市场向一体化市场过渡，省际市场的贸易水平逐渐取代省内市场的贸易水平而成为了影响各地区工业经济发展的国内消费市场中的重要因素。     

协同学在多级库存系统分析中的应用初探

讨论了协同学的基本概念;特别讨论了绝热消去方法(伺服原理)在协同学方法论中的作用、地位和意义;并运用协同学处理问题的一般步骤分析了多级库存系统,得到了序参量方程和势函数。     

敏捷企业的敏捷性指标评价体系与方法研究

敏捷企业敏捷性度量是企业敏捷化所不可或缺的步骤。对企业敏捷性的体系构建与评价是目前研究的一个热点问题。该文在综述了国内外的企业敏捷性研究文献基础上,构筑了一个基于实效的敏捷性评价指标体系,提出新的评价方法,并结合案例进行了分析,从而为更准确地评价敏捷企业的敏     

Monetary Policy with Uncertain Parameters

This paper shows that—in contrast to the received wisdom—uncertainty about the parameters in a dynamic macroeconomic model may lead to more aggressive monetary policy. In particular, when there is uncertainty about the persistence of inflation, it may be optimal for the central bank to respond to shocks more aggressively in order to reduce uncertainty about the future development of inflation. Uncertainty about other parameters, on the other hand, dampens the policy response.
JEL classification : E 43; E 52