以采剥计划作为主线促进铜采场管理全面升级

面对采剥、探采、备采严重失衡,采场标准化管理混乱,采空区治理滞后的采场不良状况,大宝山矿以采场采剥计划为主线,从完善地质资料,加强采空区治理,加强采场标准化管理等入手,加强沟通,原则性与灵活性相结合,通过一系列的措施和长时间的努力,使铜采场的生产进入良性循环.     

采场跨度优化有限元模拟研究

建立采场模型,经有限元数值模拟计算不同跨度值采场对应的采场顶板围岩应力、位移。通过主应力、正应力、位移等分析,在保证采矿生产安全的前提下,优化选取采场跨度,从而降低采准工程量、采矿损失率以提高采矿效率及效益。     

深井复杂难采铜矿床采矿方法及采准系统优化研究

从盘区布置、隔离矿柱宽度和回采方法、采准系统、采场结构参数、盘区与采场回采顺序等方面入手,采用大型的无轨穿孔设备和出矿设备,同时创新和运用先进的采准切割等工艺技术与之配合,运用最优化理论,进行回采顺序优化和排产优化,使采切工程、凿岩爆破工程、出矿工程和充填工程保持连续性,实现同时作业采场数少、设备利用率高、产量稳定等良性生产循环。通过研究和3个采场的工业试验,形成了深井缓倾斜厚大矿体的大盘区、大采场、大产能的采矿工艺技术。     

三维激光扫描仪在马坑铁矿采场超采、欠采分析中的应用

本文应用三维激光扫描技术,对井下的采空区进行探测扫描,通过三维实测采空区模型与采场设计模型对比,从水平剖面、纵向剖面分析采场的超采、欠采情况,应用Dimine软件估算出超采量、欠采量,为采场的充填设计及周边二步骤矿房回采设计提供准确、详实的基础资料。     

分层崩落采矿法回采急倾斜破碎中厚富锰矿体

主要介绍急倾斜破碎中厚富锰矿体用脉外采准、金属网木地梁假顶下向分层崩落采矿法回采时的采场结构、采准切割布置、回采工艺、采场地压控制技术、主要技术经济指标、材料消耗、评价及改进意见。     

横向采剥法在兰尖铁矿的应用

兰尖铁矿将兰、尖两采场由原设计的纵向采剥法改为横向采剥法,通过实践证明横向采剥法具有显著的优越性。它对露天矿山的技术改造、降低采矿成本、提高经济效益都具有现实意义。     

白云鄂博铁矿东采场境界优化研究

根据东采场岩石二期和矿石破碎胶带运输系统建设滞后、C区滑体影响采场正常推进,重新对采场境界进行圈定、确定1 404 m水平以下开拓公路布置、验证采场生产规模、确定边坡安全措施,从而保证采场正常生产。     

大尹格庄金矿深部采场稳定性分析与参数优化

以大尹格庄金矿-616m水平8204采场为工程依托,对采场进行稳定性分析及结构参数优化。为此,对8204采场进行工程地质调查、矿岩力学性质试验,并应用Q系统和RMR分级法对采场岩体质量进行评价。基于Mathews稳定性图表法、临界跨度图表法和数值模拟,对采场尺寸和最大跨度进行优化。分析认为,8204采场的最佳跨度为12m,并将其结果应用于现场。结果表明,采用采场暴露面尺寸为12m×100m的结构参数进行回采,采场顶板及围岩并未发生垮落及剥落现象,采场稳定性良好。     

基于ANSYS-R法的采场结构参数优化

为提高某矿回采效率,扩大生产能力,对采场结构参数进行优化。运用ANSYS对12种不同采场结构参数进行了数值模拟分析,得出各个方案采场最大主应力、顶板沉降量、两帮位移量和最大拉应力指标值,分析后保留采场宽、高分别为15 m和14 m以下的9种可行方案;采用正交试验极差法（R法）对这些方案模拟所获取的指标值进行显著性分析计算,确定采场最优宽高组合为宽9 m,高14 m;将最优采场结构应用于现场试验,并对试验采场顶板下沉量进行了实测,模拟结果与实测相对误差为7.48%,模拟结果准确性较高。试验结果表明,采用该法优化的采场结构参数不仅能够保证采场的安全稳定,而且能够大幅提高采场生产能力和回采效率。     

贺西矿3316工作面立体式瓦斯抽采技术研究

瓦斯涌出一直是制约煤炭高效开采的不利因素,为了实现采面瓦斯高效治理,贺西矿采用VLD-1000型钻机施工长距离定向钻孔对瓦斯进行抽采.以3316工作面瓦斯治理为工程实例,对采面回采巷道掘进前、掘进中以及采面推进过程中采取的瓦斯抽采技术进行详细阐述.现场应用后,巷道掘进、采面回采期间均未有瓦斯异常涌出情况;上隅角、回风巷...     

Effect of Welding on the Slip Damping of Layered and Jointed Structures

A mathematical model has been presented for the mechanism of interfacial slip damping in layered and jointed cantilever beams with continuous and tack welds. The pressure distribution at the interfaces, number of contacting layers, techniques of welding, length and thickness of the beam specimen, and amplitude and frequency of vibration are found to be the dominating factors influencing the damping capacity of such welded structures. The results can be exploited positively in the design of machine tools, aircraft, spacecraft, satellites, automobiles, missile systems, etc. for maximizing their damping capacity.     

Science and Engineering for Space: Technologies from Space 88

This paper highlights technology development for space exploration. It draws on the proceedings of Space 88, Engineering, Construction, and Operations in Space, which includes 125 papers and 1,349 pages providing in‐depth discussions of space policy, extraterrestrial basing, space stations, orbiting structures, and areas of special interest. In the space station and orbiting structures (orbital facilities) section, papers discuss the engineering, construction, and operations of orbiting space systems. Papers in the extraterrestrial basing section deal with the engineering, construction, and operations challenges faced in development of bases and operations on extraterrestrial bodies. The special interest (interacting disciplines) section provides a discussion of challenges facing us in meeting needs for space power, life support, human factors, astronomy, education, and management. The purpose of this volume on engineering, construction, and operations of facilities and bases in space is to encourage and stimulate the development of the required technologies. The concluding section of this paper focuses on space policy and a view toward the future.     

电感耦合等离子体原子发射光谱法测定铍中11种杂质元素

铍中铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌等11种杂质元素含量的准确测定,是判定铍材是否合格的重要指标。目前,上述杂质元素的测定标准为GJB 2513A—2008《铍化学分析方法》,方法分别采用光度法和原子吸收光谱法对各元素逐一测定,测定周期很长。试验采用盐酸-硝酸溶解样品,选择Al 308.215nm、Co 230.786nm、Cr 284.325nm、Cu 324.754nm、Fe 261.187nm、Mg 285.213nm、Mn 260.569nm、Ni 221.647nm、Pb 182.205nm、Si 250.690nm、Zn 213.856nm为分析谱线,采用标准加入法(MSA)配制标准溶液系列消除基体效应的影响,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌,从而建立了铍中11种元素的测定方法。各待测元素校准曲线的线性相关系数均大于0.9995;各元素的定量限为0.001%~0.002%。实验方法用于测定铍样中铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌,结果的相对标准偏差(RSD,n=10)为0.63%~8.6%,回收率为90%~110%。按照实验方法测定铍样中上述11种元素,测定结果与采用GJB 2513A—2008测定的结果吻合。     

应用于碱性土壤上重金属污染的超积累植物种植研究

以调查区的严格管控区土壤为研究对象,挑选了酸模、龙葵、月季、金盏菊、万寿菊、油牡丹、凤仙花7种植物进行了大田试验,考察超积累植物对土壤中Cd、Pb富集的影响。结果表明,不同植物体内或同种植物体内各部位重金属的含量存在较大差异;酸模、金盏菊、龙葵、月季地上部分重金属含量明显高于地下部分,说明重金属在这几种植物的茎叶里积累较多。金盏菊、凤仙花、万寿菊、龙葵对Cd的富集较强,有利于修复Cd污染的土壤。除凤仙花外,其他6种植物对Cd的转运系数均大于1,对Cd的转移能力由强到弱的顺序依次为酸模、金盏菊,龙葵、油牡丹、月季、万寿菊。就单株而言,积累生物量从大到小依次是酸模、金盏菊、万寿菊、月季;就每亩而言,积累生物量从大到小依次是金盏菊、酸模、月季、万寿菊。综合植物对重金属的富集系数、植物自身的转运系数、整株生物量以及植物的经济价值等考量,万寿菊、金盏菊、月季在修复土壤重金属污染的同时还可兼顾提升经济效益,酸模作为有效降低Cd、Pb含量的重金属修复植物,可推广应用于碱性耕地的重金属污染修复。综上所述,从植物对重金属的富集系数、植物自身的转运系数、整株生物量以及植物的经济价值等综合考量,万寿菊、金盏菊、月季作为修复土壤重金属污染的同时兼顾提升经济,酸模作为有效降低Cd、Pb含量的重金属修复植物,可推广应用于碱性耕地的重金属污染修复。     

Experimental Study of Normal- and High-Strength Concrete Confined with Fiber-Reinforced Polymers

The experimental program reported here was conducted to gain insight into the behavior of concrete confined with fiber-reinforced polymers (FRPs). A total of 112 cylindrical concrete specimens, each 150 mm in diameter, 300 mm in height, and concrete strength up to 112 MPa, were tested under monotonic uniaxial compression. Test variables included amount of FRP, strength and stiffness of FRP, concrete strength, and the health of concrete at the time of strengthening. Results showed that, with an increase of the unconfined concrete strength, the strength enhancement, energy absorption capacity, ductility factor, and work (energy) index at rupture of FRP jackets all decreased remarkably. A positive correlation was found between concrete ductility and FRP rupture strain. A gradual post-peak failure of the specimens, observed previously from FRP-confined concrete columns tested at the University of Toronto, was also observed in some of the current tests. This ductile failure, attributed to the gradual unzipping failure of FRP jacket, is related to specimen size and is explained in terms of various confinement parameters.     

Development of RH technology in China over past decade

Due to fast development of Chinese steel industry,continuous adjustment of product,improvement of quality,research of value-added product,RH technology is significantly developed.More and more steel plants are covered with RH facilities.RH ratio is growing rapidly as well.Over past decade,through assimilating advanced foreign technologies and further refining them,Chinese large scale steel plants master the technology of RH production,operation,maintenance and make it more widespread.RH functions are well applied and improved.RH is more widely effectively put into use.Through independent innovation,RH core devices and technology,such as RH vacuum pump,oxygen top lance,vacuum vessel preheating lance,ladle lifting device etc.have realized localization.The development of equipment design,software design,equipment manufacturing technology,equipment mounting,test technology and EPC management makes equipment configuration more flexible,equipment more functional and stable,easier to operate and maintain.It also guarantees highly effective and low energy consumption production and quality of steel,reaches international advanced level,lowers the cost of RH construction and operation,makes after-sake service more convenient. How to continuously optimize and develop RH process,equipment and control technology,in order to meet the needs of product with more reasonable and economic process,exploit potentialities,build more effective,lower cost,lower energy consumption,protecting environment RH facilities will be the key point of future RH technology development in China.     

混凝土强度等级的验收与评定

结合现行相关规范和实际施工操作的一些经验,对混凝土试件的制作、养护、强度计算及验收评定阐述了混凝土强度的验收与评定,对于施工阶段混凝土强度的评定,应根据混凝土的结构跨度、类型、模板位置等来评定,采用的方法有两种:一种是统计法,另一种是非统计法供施工企业参考应用。     

构建冶金企业自主型员工队伍的建设实践

当前钢铁工业面临资源价格高涨,需求增速趋缓、环境压力增大的严峻挑战,针对具有大专文化比例高达65%以上、平均年龄不足30岁的职工队伍,塑造自己的企业文化,对每一位新入厂的员工不仅进行三级安全教育,还进行入厂文化教育,通过加强员工的培训与教育、充分发挥员工的自主独立性、给员工足够的关爱、强调以人为本,实行分散化管理、实施正确的激励等管理措施,构建一支自主型员工队伍体系,最大限度地利用其拥有的知识,形成有效的合力,促进企业目标的实现。     

Review of Handbook of Self-Regulation: Research, Theory, and Applications.

This article provides a review of the "Handbook of Self-Regulation: Research, Theory, and Applications" (see record 2004-00163-000). The topic of self-regulation is currently receiving increasing attention in various areas of psychological research. Many psychological disorders (such as depression, Attention-Deficit Hyperactivity Disorder etc.) as well as addictions and risk-taking behaviour are believed to involve some kind of failure of self-regulation. Self-regulation is a concept that crosses domains. For this reason, self-regulation is, as the editors of the the book remark, "simply too large, diverse, and important a topic not to have a handbook". The editors of the Handbook define self-regulation as "processes by which the human psyche exercises control over its functions, states, and inner processes". This broad definition serves as the umbrella under which multiple areas of self-regulation research are presented. The book comprises six sections, which progress from consideration of basic processes, to applications of theory and research to "everyday problems" of self-regulation. Each chapter is self-contained, allowing one to select and focus on topics of interest. At the same time, the individual chapters provide neither a systematic discussion and comparison of different views on self-regulation, nor an exhaustive review of the literature. Furthermore, because the authors of the individual chapters largely focus on the presentation of their approach to self-regulation, the Handbook reflects the fragmented and kaleidoscopic state of self-regulation research in general. The book is a good choice for anyone with an interest in self-regulation, particularly anyone who seeks a collation of the literature, summaries of key concepts, and an idea of where the field of self-regulation is headed in the future. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

延长碳化时间对焦炭性能的影响

为了研究延长碳化时间对焦炭质量的影响，通过对焦炭块度、冷热强度和气孔率等指标进行宏观分析，并且从焦炭显微结构微观角度分析延长碳化时间对焦炭内部结构的改变。结果表明，随着碳化时间的延长，焦炭中的镶嵌组织逐渐增多，光学组织之间有很好的结合性，减少了裂纹的发生，阻止了裂纹的延展;焦炭的块度大幅提高，冷热性能均有所改善，孔径和气孔率都有所降低，焦炭的反应性降低。