4.8 m×13 m台车加热炉技术改造

介绍了4 8 m×13 m台车式加热炉的技术改造,阐述了炉子设计结构及热平衡测试结果.实践表明,改造取得了良好的节能效果及明显的经济效益.     

云铜4m×11.7m转炉吹炼实践

叙述了云铜!4m×11.7m转炉的生产实践,重点介绍了转炉的构造、辅助设施、运行参数和操作环境等,指出了生产中存在的问题。     

云铜φ4 m×11.7 m转炉吹炼实践

叙述了云铜φ4m×11.7m转炉的生产实践,重点介绍了转炉的构造、辅助设施、运行参数和操作环境等,指出了生产中存在的问题.     

φ3m×11m圆筒混合机的研制

介绍了安钢烧结厂一混改造必要性与可行性,以及φ3m×11m圆筒混合机的设备特点与使用效果。     

济钢φ3.2m×5.3m润磨机的开发设计

以济钢球团厂生产工艺参数为参照，开发设计了φ３．２ｍ×５．３ｍ润磨机。通过实践证明，该润磨机提高了出料温度，降低了出料细度，使球团矿原料得到了充分混匀，球团矿质量指提较高。收到了良好的技术经济指标。     

φ3m＊11m圆筒混合机的研制

介绍了安钢烧结厂一混改造必要性与可行性,以及φ３ｍ＊１１ｍ圆筒混合机的设备特点与使用效果。     

选矿厂2.4m×6.0m大型圆振动筛的改造

用箱式激振器对选矿厂２．４ｍ ×６．０ｍ 大型圆振筛进行了改造， 介绍了所用箱式激振器的轴承装置、偏心块结构的设计以及激振器用联轴器和激振器安装底座的设计。改造后的振动筛经过近两年的使用，效果良好。     

Φ3.2 m×3.1 m球磨机齿轮轴损坏分析及解决方案

针对Φ3.2 m×3.1 m球磨机齿轮轴损坏的4种形式,分别进行分析,提出了解决方案。     

φ4 m×10.7 m卧式PS炼铜转炉的改造

介绍了金隆铜业公司转炉加长改造的内容及特点,重点阐述了改造中转炉驱动系统方案的选择设计及采用伞齿-圆柱齿减速机的效果。     

金昌冶炼厂Ф3.2m×6.6m卧式转炉设备的技术改进

介绍了金昌冶炼厂转炉成套设备的技术改进,对改造前后进行比较,阐述了国产化所做的工作。     

New Orleans Levee System Performance during Hurricane Katrina: London Avenue and Orleans Canal South

Hurricane Katrina was one of the worst natural disasters in U.S. history. The effects of the hurricane were particularly devastating in the city of New Orleans. Most of the damage was due to the failure of the levee system that surrounds the city to protect it from flooding. This paper presents the results of centrifuge models conducted at Rensselaer Polytechnic Institute and the U.S. Army Corps of Engineers simulating the behavior of the levees at London Avenue North and South that failed during Hurricane Katrina. Those levees failed without being overtopped by the storm surge. Also included are the results of a centrifuge model of one levee section at Orleans Canal South, which did not fail during the hurricane. The key factor of the failure mechanism of the London Avenue levees was the formation of a gap between the flooded side of the levee and the sheetpile. This gap triggered a reduction of the strength at the foundation of the protected side of the levee. The results are fully consistent with field observations.     

Computational Analysis of Masonry Structures with a Funicular Model

This paper presents a computational approach for the assessment of masonry structures based on the well known analogy between the equilibrium of arches and that of hanging strings or cables working in tension. According to the analogy, the hanging strings model the inverted shape of the equilibrium lines (or thrust lines) describing the locus of the equilibrium forces acting across the sections of the arch. The approach proposed combines two developments. First, a new cable element is proposed to numerically model the strings used to describe the equilibrium lines. The formulation proposed, obtained as a modification of the conventional equations for inextensible cables, is based on an exact analytical derivation. Compared to other available numerical approaches, it has the advantage of ensuring the exact equilibrium of the cable net after deformation. Second, complementary algorithms are proposed for the assessment of the strength of masonry structures by the application of the limit theorems of plasticity (static approach). These algorithms are intended to find optimized solutions complying with the so-called safe (or lower-bound) and uniqueness theorems. Two examples of application are described to illustrate the accuracy of the method and its ability to handle masonry structural systems.     

Formation of Secondary Containment Systems Using Permeation of Colloidal Silica

U.S. Environmental Protection Agency (USEPA) regulations require the capture of spills from liquid tanks containing hazardous chemicals by using a secondary containment system. Compacted clay or geomembrane liners are commonly used in secondary containment systems, but they are cumbersome when used in conjunction with existing liquid tanks because of pipeline networks surrounding the tanks. This study evaluates the formation of hydraulic barriers for secondary containment through the permeation of colloidal silica grout. A simplified infiltration model is presented to predict the downward movement of the colloidal silica grout into a soil layer, considering the time-dependent increase in dynamic viscosity of the colloidal silica for different concentrations of an electrolyte accelerator. Because the simplified infiltration model cannot predict the soil-grout interaction or the permeation of the colloidal silica by fingering, its results were calibrated by using the observations from a large-scale column test involving the permeation of colloidal silica into sand. The predicted position of the wetting front was found to match that of the experiment when the parameter governing the change in viscosity of the colloidal silica was increased by a factor of 30. The infiltration model calibrated with observations from column infiltration experiments provides a simple approach to the design of the secondary containment systems using permeation of colloidal silica.     

碱度对白云鄂博矿球团矿还原膨胀性能的影响

高比例球团矿冶炼是高炉炼铁发展的趋势。由于化学成分、矿物组成和结构的差异，不同企业生产或所用的球团矿还原膨胀的原因各不相同且相对复杂。面向保障矿产资源安全供给的国家重大战略需求，选择白云鄂博铁精矿球团矿作为研究对象，根据球团矿铁氧化物还原理论，从热力学方面深入研究碱度对球团矿还原膨胀性能的影响机理，并结合XRD结果来探究钙结合相在球团矿生产中的变化规律以及对球团矿还原膨胀的影响，找到满足高炉冶炼对球团矿还原膨胀率要求的合理碱度，从而提高白云鄂博铁精矿球团矿在包钢冶炼生产中的比例。完善特殊矿球团矿还原膨胀理论，为复杂共生矿高效冶炼提供理论支撑。研究结果表明，随着碱度的提高，球团矿的膨胀率呈现出先升高后降低的规律，碱度为0.8时，其膨胀率最大，达到75.743%,其外形如同花瓣开花，无法维持原来的球型。综合不同碱度球团矿含铁品位的高低和还原膨胀的大小，得到制备球团矿的最优碱度为1.4。随着碱度的提高，成品球的液相生成量先降低后升高，碱度为0.8时液相生成量最少。球团矿膨胀率先增加是因为球团矿的结晶度提高，晶粒粗大，晶体结构逐渐趋向有序，为铁晶须的生长奠定了基础；膨胀率后减小是因为生成了铁酸...     

Failure Analysis of a Bridge Embankment with Cracked Approach Slabs and Leaking Sand

This paper describes a successful failure analysis to determine the causes of loss of backfill sand from a mechanically stabilized earth (MSE) wall, and cracks on the concrete approach slabs on top of it. The Texas Department of Transportation was concerned that the cracks on the approach slabs may be related to the excessive loss of backfill from behind the MSE walls, and that the embankment structure may be unsafe due to potential voids under the concrete slab. Several cubic meters of sugar sand had washed out of the wall and deposited adjacent to the paneled walls. A series of destructive and nondestructive tests were carried out to determine the causes of the problems. It was found that the cracking of the approach slab and the loss of backfill were unrelated. Suggestions for resolving both problems were made based on this study.     

From the editors.

Introduces the articles appearing in this issue of Psychology of Aesthetics, Creativity, and the Arts. Of particular interest in this issue are the breadth and the rigor of the methodology that underlie the substantive and theoretical issues addressed in the work. The issue begins with an article from Dean Keith Simonton, who looks at the idea of what success in film is and how different indicators of success (critical, box office, etc.) are related to one another over the life of a film. Paul Silvia, James C. Kaufman, and Jean Pretz then address the question of the domain specificity of creativity. The third article shifts to the field of music and looks at the relationship between personality characteristics and how people use music in their lives. The next article reports the results of an experimental design that looked at recognition of objects in cubist paintings and pupil dilation after having made a classification of an object. The next article looks at differences in the motivations and personality characteristics of individuals who visit modern art museums versus ancient art museums. Next, Patricia Stokes uses the problem-solving approaches of Reitman and Simon in a case study examining the sculpture of Richard Serra. The issue concludes with an analysis of the idea of “lived experience” as it relates to the psychology of aesthetics and art making. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Multiple Simulation Analysis for Probabilistic Cost and Schedule Integration

One of the major goals of the construction industry today is the quantification and minimization of the risk associated with construction engineering performance. When specifically considering the planning of construction projects, one way to control risk is through the development of reliable project cost estimates and schedules. Two techniques available for achieving this goal are range estimating and probabilistic scheduling. This paper looks at the integration of these techniques as a means of further controlling the risk inherent in the undertaking of construction projects. Least-squares linear regression is first considered as a means of relating the data obtained from the application of these techniques. However, because of various limitations, the application of linear regression was not considered the most appropriate means of relating the results of range estimating and probabilistic scheduling. Integration of these techniques was, therefore, achieved through the development of a new procedure called the multiple simulation analysis technique. This new procedure combines the results of range estimating and probabilistic scheduling in order to quantify the relationship existing between them. Having the ability to accurately quantify this relationship enables the selection of high percentile level values for the project cost estimate and schedule simultaneously.     

Reliability Analysis of Shotcrete Lining during Tunnel Construction

To a tunnel under construction, a prompt assessment of the stability of the lining through in situ measured data is of practical importance both for the observational designing of the tunnel and to guarantee the safety of construction. Among all the parameters measured during tunnel construction, displacement measurement is the most convenient and at the same time, the most credible and cost effective method to track the performance of tunnel lining. The aim of this paper is to develop a displacement-based method suitable for conducting reliability evaluation of the shotcrete lining in the progress of construction of a tunnel. First of all, a performance function at the cross section is put forward. Next, formulas are listed to calculate the internal forces in a lining segment. Then, the variability of the basic random variables is explained. Further, a process to compute the reliability index through measured displacements is presented. After that, two case studies are done. Finally, the nature of the proposed method is observed and some remarks are made on further developments. The proposed method can meet the need of reliability evaluation of shotcrete lining during tunnel construction and also is certainly of theoretical significance to a large extent.     

碱度对白云鄂博铁精矿压团矿抗压强度的影响

发展熔剂球团矿是当前炼铁原料工艺技术发展的方向和热点之一,球团矿的碱度不同,其理化性质及冶金性能也不同。通过分析不同碱度的白云鄂博铁精矿压团矿矿相结构的变化规律,探究碱度对白云鄂博铁精矿压团矿抗压强度的影响规律。结果表明,随着碱度的升高,压团矿的抗压强度先增加后降低,液相量的增加使得孔隙率降低,压团强度升高,但过多的液相会破坏赤铁矿的整体性结构,渣相强度低于赤铁矿强度,压团的强度逐渐降低。     

自动化技术在露天金属矿山的应用实践

随着我国经济的快速发展,在自动化技术在露天金属矿山的应用实践方面也是相对重视起来,经济的快速发展间接影响着我国的矿山资源需求的增长,从对矿山连续生产的角度来看,新技术对于露天金属矿山的开采具有重要意义。露天金属矿山的开采技术的提出代表我国的自动化技术在露天金属矿山的应用实践到达了一个新的高度,对于国家的发展以及人民对于物质生活的越来越高的要求都从侧面激发着露天金属矿山的开采技术的研究发展。自动化技术在矿山生产中的充分运用,主要在矿山开采与生产效率上得到了充分的体现。