圆柱体镦粗应力场的力学分块积分计算及扩展应用

冷镦钢产品的冷镦性能是通过圆柱体试样在平板间镦粗来检验的。镦粗过程中试样内部的变形应力分布的规律，可以用来分析材料顶锻开裂产生的原因，从而采取针对性措施改善产品冷镦性能。本文用回归的方法得到变形体轮廓曲线的方程，并采用微积分的方法建立了柱体在平板间镦粗过程的变形体连续微分力学模型。描述了圆柱体在平板间镦粗过程中变形体内部及表面应力场的分布及应力状态。并描述了镦粗过程中变形体轮廓曲线与镦粗比的相对关系，利用圆柱体镦粗应力场的积分方法对不同镦粗比下的变形体的应力场进行计算，得到变形体应力场与镦粗比之间的变化关系。     

轧制过程中粗轧宽度变形的三维有限元模拟

应用MARC／autoforge商用有限元软件，对长方形轧件在热轧粗轧过程的宽度变形过程进行热力耦合模拟。简介了宽展的种类及其组成，模拟研究中主要计算了板坯在粗轧过程中的宽展量。分析计算说明，采用有限元模拟的方法可以较好地反映板坯宽度变形的实际情况。     

关于检查导线测量粗差方法的探讨

导线具有布设灵活,适用于已知点稀少的隐蔽地区等特点,因此,在控制测量中得到了广泛应用.本文以附合导线为例,简要分析了导线测量中粗差可能产生的原因,介绍了粗差判断的方法,并针对导线闭合差中无法发现的粗差作了初步探讨.     

锻造速度对粉末冶金烧结体塑性变形及性能的影响

研究了用液压机，曲柄压力机，空气锤及高速锤的打击速度对粉末冶金烧结体进行的镦粗试验，分析了变形程度，打击速度与锻件密度之间的关系。结果表明：烧结体的镦粗变形规律与致密体相同，指出了曲柄压力机是粉末锻造工艺的最佳设备。     

陕西八方沟尾矿库坝体变形监测与成因分析

简单介绍了八方沟尾矿库变形观测网的布设原则及监测方法。通过对坝体的变形观测网多次观测资料的平差计算,进行了监测资料处理和精度分析,绘制观测点的变形图,分析了坝体的形变成因。监测测量成果分析说明:各级坝体水平位移处于相对稳定状态,垂直位移是因固结沉降引起的。提出了八方沟尾矿库安全运营建议。     

加测陀螺方位边在贯通测量中的应用

本文介绍了在原有测量成果无粗差.但不能满足贯通精度要求时,采用加测陀螺方位边在银山铅锌矿中型贯通测量中的应用.实践说明加测陀螺方位在贯通测量中,特别是在测量成果缺乏完整性、系统性的井下开采的老矿山应用,具有操作简便、工作效率高等优点,很值得推广.     

圆柱体镦粗应力场的力学分块积分计算及扩展应用

冷镦钢产品的冷镦性能是通过圆柱体试样在平板间镦粗来检验的。镦粗过程中试样内部的变形应力分布的规律,可以用来分析材料项锻开裂产生的原因,从而采取针对性措施改善产品冷镦性能。用回归的方法得到变形体轮廓曲线的方程,并采用微积分的方法建立了柱体在平板间镦粗过程的变形体连续微分力学模型,描述了圆柱体在平板间镦粗过程中变形体内部及表面应力场的分布及应力状态,并描述了镦粗过程中变形体轮廓曲线与镦粗比的相对关系,利用圆柱体镦粗应力场的积分方法对不同镦粗比下的变形体的应力场进行计算,得到变形体应力场与镦粗比之间的变化关系。     

平面应变镦粗问题的摄动分析

通过引入速度势函数，将理想刚塑性体平面应变问题的控制方程化简为两个非线性偏微分方程．应用摄动方法，以摩擦因素（是摩擦系数和变形区几何参数的函数）为摄动参数，获得了平面应变镦粗问题的摄动解．在此基础上，研究了镦粗过程中的变形规律和应力分布规律，理论分析结果与由其它理论所得的结果符合较好．     

IF钢罩式退火过程中织构变化的研究

使用ＥＢＳＤ（电子背散射衍射）手段对ＩＦ钢在罩式退火过程中织构的变化进行了研究。研究结果表明：冷变形纤维是由尺寸小于２μｍ的亚晶组成，亚晶之间具有空间取向差，（００１）变形晶粒中亚晶的取向差很小，而（１１１）变形纤维中亚晶的取向差通常较大，这导致（１１１）冷变形基体上首先发生形核和长大，而（００１）取向纤维最后被吞并，随着再结晶的进行，晶粒之间的取向差呈小角度关系的比例下降，这是因为具有相近取向的     

二矿区地表变形监测与井下采掘工程变形的探讨

本通过对现有地表变形监测资料的整理和分析，结合井下采掘工程的变形、返修量的显增加等问题，提出在加强地表变形监测的同时，应充分考虑井下采掘工程因严重变形对二矿安全生产带来的影响，急需把地表变形监测与井下变形工程监测相结合，使变形监测成果能更好的为二矿的生产服务。     

CVC工作辊磨损和热凸度对轧机板形控制性能的影响

仿真研究了磨损和热凸度对CVC技术板形控制性能的影响,指出CVC工作辊磨损量达到0．2mm时就有可能使CVC轧辊移动对板形的控制作用畸变,甚至无效。     

Decay study of pesticide residues in apple samples

A method for monitoring pesticides in apple samples, including Soxhlet extraction, an evaporation step and capillary gas chromatography with nitrogen-phosphorus detection, is applied to a decay study of the carbamate pesticide ethiofencarb. The evaporation step is carried out by a surface nitrogen flow and the recoveries of ethiofencarb measured in standard solutions of ethyl acetate and apple extracts. The results of the decay studies show that ethiofencarb is degraded in the apple peel faster than in the interior of the fruit. The methodology is then applied to decay studies in the laboratory of the organophosphorus pesticides, diclofluanid, fenitrothion and malathion.     

Pencil and paper: the simple solution to getting the numbers you need to effectively manage your practice

Once you have mastered the basics by going through the monitoring exercise once or twice, you will find it takes little time and effort to start finding out just where your practice stands. You only solve a problem after you have found out that there is one and you might find that this simple monitoring exercise shows you areas of your practice where a little attention from you will pay big dividends. Monitoring is like a fine wine: it improves with age. As you begin to compile more and more months of data, you will be able to start comparing this month's performance with last month's, or this quarter with last quarter, this year with last year. One of the most useful things monitoring will do for you is to allow you to compare your practice's performance with that of other practices. Averages, norms, and performance survey results are to be found in a range of practice management publications. Using your monitoring information in this comparative way helps you to identify those areas in your practice management that are holding you back from achieving your true potential. This lets you focus your management time and effort on the truly important issues, which, when solved, will help you turn your practice into a less stressful, more enjoyable, and more profitable place to work.     

湘钢1号高炉炉体中部温度监控操作实践

湘钢１号高炉利用炉体中部耐火砖测温装置对炉体中部实行内型监控,通过监测数据的统计分析,得到了较为合理的内型空温度范围。实践证明,利用这些数据间接监控高炉炉体中部内型的变化,可避免该部位炉墙结厚事故的发生。     

Mechanics and Test Study of Two-Dimensional Flexible Membranes

Numerous enclosure wall systems as well as roof systems employ membranes that are not fully adhered, common examples being mechanically attached roofing membranes and housewraps in screen-type exterior wall systems. Under a negative air pressure differential, these membranes can deform or balloon. Ballooning of the membrane will affect many aspects of performance. For instance, it will change the volume of the air chamber in screen-type wall systems and will, therefore, affect both the extent of screen pressure moderation and the nature of ventilation within the wall. This paper develops the structural mechanics for flexible membranes ballooning in two dimensions under an air pressure differential. The governing differential equation is derived and solved numerically. A second-order parabola is assumed to describe the ballooning shape of the two-dimensional flexible membrane. Alternative theories for the ballooning shape are reviewed and compared. A series of physical tests were carried out to confirm the deformed shape and the magnitude of the peak deflection.     

爆破角砾岩体型金矿床成矿特点

论述了隐蔽爆破乐岩体的爆破－冷凝－成矿过程。建立了该岩体的成矿模式及形态特征。并通过成矿的分析及多年的探矿生产实践，总结出了找矿模式，这对于该类型的找矿，减少探矿投入将直到指导性作用。     

现代化能源监控及管理系统的集成与应用

介绍现代化能源监控及管理系统的组成和功能特点,指出高效的能源监控系统(EMS)和L3能源管理子系统的成功应用是不锈钢分公司能源信息化建设的必然趋势,也是提升分公司整体能源管理水平的必然途径.     

六辊轧机非对称板形调控特性研究

针对冷轧板带产品的非对称板形缺陷问题,建立六辊轧机辊系-带钢耦合有限元模型。分别针对压下倾斜、非对称中间辊弯辊和非对称工作辊弯辊三种手段对板带轧机非对称板形调控特性进行了分析。结果表明,压下倾斜对1次板形效果较显著,非对称工作辊弯辊对3次板形效果较显著,而非对称中间辊弯辊的调控效果较小。各手段相互配合可控制不同的板形模式,为冷轧板形控制策略提供理论依据。     

Nursing at the crossroads

Crossroads is the term used to describe nursing's decisional grid in the post health care reform era. Four avenues of practice are laid out. Nursing's decision about clinical pathways will contribute to the future of professional nursing and help shape health care delivery.     

PC轧机板形板凸度控制策略

 根据PC轧机的结构特点,用三维差分法分析金属塑性变形,用影响函数法分析辊系弹性变形,建立PC轧机板形板凸度控制模型。对PC轧机轧制过程进行仿真研究,分析其工作辊弯辊力和交叉角控制特性,进而给出相应的控制策略。研究结果表明：在板形控制过程中,PC轧机交叉角具有很强的板形板凸度控制能力,而工作辊弯辊对辊间压力分布影响很大。通过两者合理的设定与分配,可以使辊间压力分布均匀,板形控制效果更为良好。