中深孔爆破炸药量计算方法的应用

深孔爆破中，使用常规方法计算出的炸药量，恰好满足已施工深孔的爆破合理需求量是困难的，潘洛铁矿在井下中深孔爆破中，按爆破设计的排孔装药系数计算药量，在生产中取得良好的效果。     

基于中深孔爆破法的金矿开采研究

中深孔爆破法是金矿开采过程中较为常见的一种爆破方法,对于爆破力度较低的情况可以实现非常有效的补充和延伸。在金矿实际开采过程中,中深孔爆破法经常作为二次爆破的基础。在金矿开采中应用中深孔爆破法,为有效提升金矿开采的工程质量,确保工程严格依照施工进度顺利开展,则需要对开采矿区的相关数据进行详细了解,同时设置安全爆破参数,并依照采场的实际参数,确定采场爆破数据安排爆破施工。本文对基于中深孔爆破法的金矿开采实际应用进行了研究,分析了金矿采场爆破特点,并对中深孔爆破法在金矿开采中的应用效果进行了探讨。     

中深孔落矿爆破漏斗试验研究

为优化井下中深孔爆破参数,根据利文斯顿爆破漏斗理论,在与采场岩性相似的巷道内进行单孔爆破漏斗试验,运用Matlab软件对试验数据进行三次多项式拟合,计算出最佳炸药埋深及临界埋深。随后进行了变孔距多孔同段爆破漏斗试验和斜面台阶爆破试验,确定了中深孔爆破的孔网参数和炸药单耗的取值范围,为矿山降低凿岩爆破成本提供了科学依据。     

中深孔爆破技术在某矿山的实践

文章研究了非煤矿山开采中的中深孔爆破技术,首先简析了中深孔爆破的概念和常用方法,包括平面爆破、空间爆破和环形爆破。然后介绍了非煤矿山开采利用中深孔爆破技术的步骤与方法,包括孔网布置、用药量计算和起爆方式设计。最后进行了实践案例分析,并提出了改进方向,以进一步提高中深孔爆破技术在非煤矿山开采中的效果。     

露天爆破钻孔施工工艺研究

钻孔质量的好坏，直接关系到爆破效果的优劣。在露天矿山开采中，如果钻孔质量不好，爆破后易留有根底，直接影响铲装；大块率偏高，影响后续工作，对大专需要进行二次破碎处理，影响工程进度，并且提高了矿石的成本。本文阐述了露天深孔爆破的钻孔施工工艺，对露天爆破钻孔有参考和指导作用。     

逐孔爆破在露天台阶爆破中的实践

本文阐述了逐孔爆破的原理及其设计原则,在此基础上,以某露天矿山台阶爆破的背景,重点对逐孔爆破网络的可靠性进行了分析,并将逐孔爆破运用于1260台阶中深孔爆破,实践表明,该起爆方式能起到良好的爆破效果。     

井下中深孔爆破技术的改进

针地良山铁矿特定矿岩条件，设计中改进了中深孔爆破技术，进行了试验，取得了较好效果，文事还从理论上分析了孔底反向起爆，多排同段微差爆破等能有效改善了矿岩的爆破效果。     

改善南芬露天矿中深孔爆破效果的措施

分析了影响南芬露天矿中深孔爆破效果的因素，并提出了改善措施，对提高露天矿中深孔爆破质量有一定参考价值。     

提高中深孔爆破质量的实践

根据建昌马道铁矿采场工程地质条件和采矿作业的的实际情况,对中深孔爆破参数进行了优化,强调了与爆破相关的几项工作,提高了中深孔爆破质量。     

某石灰岩地下矿山中深孔爆破震动测试与分析

为了研究中深孔爆破震动对矿柱和巷道的影响,确定中深孔爆破震动的衰减规律,对某石灰岩地下矿山中深孔爆破试验进行了震动测试.通过对实测爆破振动速度数据进行分析,找出了适合该矿萨道夫斯基经验公式中的参数K、α值.从而确定了该矿中深孔爆破震动的衰减规律,以及最大段起爆药量和安全距离的关系,为该矿中深孔爆破试验设计和优化提供依据...     

Introduction to the special section on cognitive processes and psychotherapy.

Theoretical models featuring cognitive processes have played a fundamental role in advancing knowledge of psychopathology and its treatment and have emphasized the importance of cognition in psychotherapy. Recognition of the importance of cognition in psychotherapy has led to a number of questions that are addressed by the articles in this special section of the Journal of Consulting and Clinical Psychology. Cognitive therapy is well represented in the articles in this special section, but therapeutic procedures that do not represent typical cognitive therapy are also examined. The articles in this special section focus on homework in the modification of cognition, cognition in the treatment of anxiety in adults and in children, change in depressive cognitions in children, cognition and rapid change in the treatment of depression, and the role of cognition in the treatment and prevention of depression that is recurrent. Examination of these types of questions holds the possibility of advances in existing treatments and the possibility of innovations in new treatments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

球团链箅机回转窑工艺中氯和硫元素迁移规律

摘要：对链箅机回转窑工艺中各段球团样品进行实验分析,研究了氯元素和硫元素在链箅机回转窑工艺中的迁移规律,明晰了烟气中HCl的生成机制。结果表明,球团原料中的氯元素主要是以NaCl的形式存在,氯元素有一部分在链箅机抽风干燥段会转变成HCl气体并进入烟气,一部分在链箅机预热Ⅱ段之后以NaCl的形式汽化进入烟气,剩余的氯元素仍以NaCl的形式存在于成品球团矿中。烟气中的HCl气体是在抽风干燥段,由富含SO2的烟气与含水球团料层中的NaCl发生反应生成的,烟气中SO2转变成Na2SO4重新固定于料层中。在预热Ⅰ段和预热Ⅱ段,烟气中的SO2与原料中碳酸钙分解生成的游离CaO反应生成CaSO4,也会重新固定烟气中的SO2。     

某铀矿区水稻土—地表水铀含量对稻米铀含量的影响

以水稻土—地表水铀含量为视角,从水稻土剖面铀含量分布规律、水稻土与下伏岩体稀土元素特征、不同河流不同河段水稻土—地表水—稻米铀含量特征、水稻土与稻米铀含量关系4个方面研究721铀矿区稻米铀含量成因。结果表明,水稻土剖面铀含量从表层至半风化花岗质基岩层呈明显降低的特征,说明水稻土铀含量高的原因不是土壤母质铀含量高;岩石与水稻土稀土元素标准化模式均表现为向右倾斜型,均属轻稀土富集型,轻稀土分馏明显,表明水稻土为还原环境,吸附作用较强;不同河流不同河段水稻土—地表水—稻米铀含量平均值的特性均为上游最低、中游最高、下游次之。铀矿区地表水环境符合铀元素在水稻土中被平衡吸附的动力学条件,有利于铀元素在矿区内河流中游地区的水稻土中沉淀富集;正在采矿区水稻土与稻米铀含量具有高度的空间耦合性,呈指数正相关关系,相关系数0.749。矿区内河流沿岸稻米铀含量的分布特征是由铀元素的迁移途径决定的"采矿活动(铀尾矿露天堆放)→地表水→水稻土"。     

基于风险管控的矿区污染修复技术与模式综述

矿区环境的污染防治与生态修复是促进我国“十四五”生态文明建设的重要内容之一，促进风险管控与修复技术集成是治理矿山污染的必然趋势。回顾了近年来我国矿区污染的主要修复类与管控类技术，总结了风险管控模式下矿区污染场地一般修复思路，并在此基础上归纳概括了4种我国矿区的修复管控模式与实施案例，包括基于污染物时空分布、迁移转化规律、场地利用方式及风险等级的矿区修复管控模式。以期为未来我国建立涵盖风险标准体系与技术体系的场地治理模式提供参考与支撑。     

冷却速率对KR脱硫渣中硫析出行为的影响

KR脱硫渣中主要成分(CaO)为转炉冶炼的优质造渣原料,通过氧化性气氛将渣中硫脱除后可将其用于转炉冶炼.但由于炉渣冷却制度不同,渣中硫的析出行为和赋存状态会发生变化,对炉渣氧化脱硫效果产生影响.基于此,以合成渣的形式探究冷速对KR脱硫渣中硫析出行为的影响,旨在明确KR脱硫渣中硫赋存状态及析出行为与冷却速率的关系,为后续...     

高磷铁矿含碳球团还原熔分脱磷

通过对高磷铁矿中磷灰石还原机理的分析,发现配加碱性添加剂有利于抑制磷灰石还原,减少珠铁中磷含量。试验首先向含碳球团中配加CaCO3调节碱度,并在此基础上分别添加Na2CO3、CaF2,研究碱度和添加剂对球团还原熔分后珠铁和渣中磷含量的影响,得到磷的分配情况。试验结果表明:提高碱度,配加Na2CO3、CaF2均有利于抑制高磷铁矿中磷灰石的还原,降低珠铁中的磷含量。在1 400℃,碱度为1.4,Na2CO3、CaF2的质量分数均为4%,反应时间为12min时,珠铁中磷含量达到最低,脱磷率达到81.2%。     

O. Chanute, C.E.

Octave Chanute was one of the leading civil engineers in the United States in the period between 1850 and 1890. His work on eastern and western railroads was unsurpassed. He began his bridge building career in 1856 and designed his last major bridge in 1888. Starting in 1890, he began his study in the work that others conducted in the area of manned flight and designed and tested many of his own gliders. He later assisted the Wright Brothers in their experiments in Dayton and at Kitty Hawk.     

Tension and Compression Stability and Second-Order Analyses of Three-Dimensional Multicolumn Systems: Effects of Shear Deformations

The stability and second-order analyses of three-dimensional (3D) multicolumn systems including the effects of shear deformations along the span of each column are presented in a condensed manner. This formulation is an extension to an algorithm presented recently by the writer in 2002 and 2003 by which the critical load of each column, the total critical load, and the second-order response of a 3D multicolumn system with semirigid connections can be determined directly. The proposed solution includes not only the combined effects of flexural deformations and shear distortions along the columns in their two principal transverse axes, but also the effect of the shear forces along each member induced by the applied end axial force as the columns deform and deflect (as suggested by Haringx in 1947 and explained by Timoshenko and Gere in 1961) in their two principal transverse axes. The extended characteristic transcendental equations (corresponding to multicolumn systems with sidesway and twist uninhibited, partially inhibited, and totally inhibited) that are derived and discussed in this publication find great applications in the stability and second-order analyses of 3D multicolumn systems made of materials with relatively low shear stiffness such as orthotropic composite materials (fiber reinforced plastic) and multilayer elastomeric bearings used for seismic isolation of buildings. The phenomenon of buckling under axial tension in members with relatively low shear stiffness (observed by Kelly in 2003 in multilayer elastomeric bearings, and recently discussed by the writer in 2005) is captured by the proposed method. Tension buckling must not be ignored in the stability analysis of multicolumn systems made of columns in which the shear stiffness GAs is of the same order of magnitude as π2EI/h2.     

Functions of Xyloglucan in Plant Cells

While an increase in the number of xyloglucan tethers between the cellulose microfibrils in plant cell walls increases the walls' rigidity, the degradation of these tethers causes the walls to loosen. Degradation can occur either through the integration of xyloglucan oligosaccharides due to the action of xyloglucan endotransglucosylase or through direct hydrolysis due to the action of xyloglucanase. This is why the addition of xyloglucan and its fragment oligosac-charides causes plant tissue tension to increase and decrease so dramatically. Experiments involving the overexpression of xyloglucanase and cellulase have revealed the roles of xyloglucans in the walls. The degradation of wall xyloglucan in poplar by the transgenic expression of xyloglucanase, for example, not only accelerated stem elongation in the primary wall, but also blocked upright-stem gravitropism in the secondary wall. Overexpression of cellulase also reduced xyloglucan content in the walls as cellulose microfibrils were trimmed at their amorphous region, resulting in increased cell volume in Arabidopsis leaves and in sengon with disturbed leaf movements. The hemicellulose xyloglucan, in its function as a tether, plays a key role in the loosening and tightening of cellulose microfibrils: it enables the cell to change its shape in growth and differentiation zones and to retain its final shape after cell maturation.     

Alkali Capacity and Physical Properties of Blast Furnace Type Slags

Alkali compounds, mainly those of Na and K, generally play a negative role in ironmaking blast furnaces. As easily circulating substances they consume energy, disturb furnace operation in the shaft and represent undesired impurities in the discharged slag and dust. An important task is to concentrate the alkalis in the slag as the best possible way. Control and optimisation of BF slag composition with respect to the alkalis requires reliable knowledge of basic data on the thermochemical and physical properties of the various slag compositions in the relevant iron‐slag system and in a wider range of temperatures according to the different reaction zones in the blast furnace. In the present paper, data are critically reviewed on free energies of reaction, the solubilities, bacicities and capacities of alkali oxides as well as on physical properties of alkali‐containing slags such as density, viscosity and surface tension. Furthermore alkali behaviour in primary and secondary BF slags and alkali circulation in the blast furnace are outlined. In a subsequent paper, new data on the chemical activities of alkali oxides in BF type slags and the kinetics and rates of alkali evaporation from these slags will be presented.