原理框图维修方法

对大型精密仪器应用原理框图进行故障分析和维修的方法进行总结，该方法解决了大型精密分析仪器维修缺少图纸指导的问题，使仪器维修工作变得清晰、简捷。通过红外碳硫分析仪故障分析和维修的实例，说明了应用原理框图维修的具体方法，对各型精密分析仪器的维修具有借鉴参考作用。     

维修实录获取维修经验和设备管理基础数据

实行维修写实记录总结应用，是提高维修人员的维修技能、积累维修经验和提高维修效率的有效方法；也是获取设备管理基础信息的有效手段和检验设备管理效果的重要依据。     

浅谈焦炉热态维修

本文简要介绍先进的焦炉热态维修工艺，热维修炉温管理技术，炉体拆除和炉体保护，炉体砌筑以及炉体升温技术等，通过总结分析，提高焦炉热维修技术的认知能力，增强焦炉热维修水平。     

设备维修方式变革的实践

总结设备定期维修和状态维修两种维修方式的实践经验，分析比较各自的优、缺点，总结出设备维修应走状态维修与技术改造相结合的道路。     

结晶器维修问题探讨

结晶器是CSP生产线上的关键设备之一，其上线使用前的维修和调试是非常重要的一个环节。本文分析了影响结晶器维修质量的主要因素，对结晶器维修问题进行了充分的探讨。     

电炉设备及维修

本文介绍了电炉设备生产能力和第二重机厂的电炉设备维修守好标准及维修程序。此外，介绍了日本电炉维修方法。     

工厂变电站维修管理的改进

本文阐述了作者在工厂变电站设备的维修管理策略方面，从定期维修向状态维修转变的思路和部分实践所取得的成果，而状态维修的关键在于掌握设备状态的主要信息，加强设备的管理。     

电气设备检修维修管理制度相关问题探讨

电气设备的定期维修管理一直是以时间周期为基础的，然而近10年来，有的学者对这种以时间为基础的定期维修制度提出质疑，在实践中人们不断采用新技术探索管理制度，逐渐向以使用状态为基础实施维修并取得了一定的成效，本文详细探讨了电气设备定期维修和状态维修制度相关问题。     

家用电器维修课堂有效教学探索

本文分析了家用电器原理与维修课堂有效教学的必要性，探索了提高维修课堂有效教学的方法，以培养适应社会实际需要的高素质家用电器维修人才。     

宝钢设备维修管理实绩分析

实绩分析是PDCA循环工作法在设备维修管理上的应用。它依据工作计划及设定日标，对照实施情况，进行检查分析，总结经验教训，找出对策措施，提出新的目标。从而达到不斯减少设备故障，降低维修成本，提高维修工作效率和设备作业率。     

应用层次分析法确定影响巷道掘进效率的因素

层次分析法是一种层次权重决策分析方法。介绍了层次分析法理论以及应用层次分析法的一般步骤和计算方法,并对大屯锡矿影响其掘进效率的工人熟练度、凿岩时间、喷浆时间、管理水平等20个因素进行分析,根据专家打分对各影响因素进行赋值,通过分析计算确定了各影响因素的优先级,从而得出了影响掘进效率的主要因素为凿岩时间、喷浆时间、维修设备时间及管理水平4个因素,其占总权重数分别为32.4%、15.4%、15.4%和12.6%。最终,在此基础上对凿岩、喷浆、设备停修等问题提出了相应的改进措施。     

2004年铁合金市场回顾与2005年展望

2004年国际和国内铁合金价格波动较大，全年价格总体水平较往年有较大增长。2004年我国铁合金行业产销两旺，全年产量和出口量均创历史新高，市场价格较往年也有明显改善。但是，铁合金行业发展过热已引起国家有关部门和业界的高度重视，并相继出台了一系列相关的产业政策和调控、指导性措施，对整个铁合金行业的发展产生了深远影响。文章从生产、消费及进出口等方面对2004年中国铁合金市场进行了分析并对2005年市场前景进行了预测。     

Integrated Two-Dimensional Surface and Three-Dimensional Subsurface Contaminant Transport Model Considering Soil Erosion and Sorption

To investigate the complex hydrological, morphodynamic, and environmental processes in watersheds, a physically-based integrated two-dimensional (2D) surface and three-dimensional (3D) subsurface model for flow, soil erosion and transport, and contaminant transport in the surface-subsurface system is presented in this paper. The model simulates the rainfall-induced surface flow by solving the depth-averaged 2D diffusion wave equation and the variably-saturated subsurface flow by solving the 3D mixed-form Richards equation. The surface and subsurface flow equations are coupled using the continuity conditions of pressure and exchange flux at the ground surface. The model uses the concept of nonequilibrium in the depth-averaged 2D simulation of nonuniform total-load sediment transport in upland fields, considering detachments by rainsplash and hydraulic erosion driven by surface flow. The integrated 2D surface and 3D subsurface contaminant transport model takes into account the contaminant changes due to sediment sorption and desorption, as well as exchanges between surface and subsurface domains due to infiltration, diffusion, and bed change. The model applies the same set of surface equations of flow, sediment, and contaminant transport for describing both upland areas and streams, so that no special treatments are required at their interface. The established model has been evaluated by comparisons with published experimental, numerical, and analytical data and then applied in an agricultural watershed. The model is suitable for wetland areas and agricultural watersheds in which streams are not very narrow and deep, and meanwhile a relatively fine mesh that can distinguish the streams is preferred.     

Evaporation Research: Review and Interpretation

Literature regarding evaporation from soil, wet plant surfaces, and sprinkler droplets was examined, normalized, and interpreted. Much of the evaporation literature is difficult to compare and interpret; this paper offers comparisons and discussions of various findings by others as well as by the writers. Techniques of measuring and estimating evaporation from irrigation and rainfall are discussed. The partitioning between increased evaporation and decreased transpiration from a variety of research is quantified. Factors that impact the various forms of evaporation are listed and quantified. This review and summary will provide practitioners and researchers with theoretical and practical guidance on measurement techniques and estimates of evaporation under a wide range of conditions.     

Dynamic Modeling of Hydraulic Shovel Excavators for Geomaterials

The hydraulic shovel excavator has found significant applications in surface mining, construction, and geotechnical operations due to its flexibility and mobility. The key to high availability and utilization of this shovel is adequate understanding of machine dynamics and machine-formation interactions among other technical, operating, safety, and economic factors. These shovels are capital intensive, complex in design and operation within severely constrained environments. Detailed dynamic modeling and analysis are required to understand their effective utilization for achieving efficient operating performance and economic useful lives. Previous attempts at solving these problems are limited because they do not provide knowledge on the resistive forces and moments for efficient excavation. In this paper, the Newton-Euler techniques are used to develop hydraulic shovel dynamic models with numerical examples. Detailed analysis of the results shows that: (1) the kinematics of the stick-bucket joint (joint 3) is the most critical and effective control of this joint and is important input into efficient excavation design and execution; and (2) the highest resistive moments occur between the duration of 1.5 and 2.0?s after the start of formation excavation and the highest magnitudes are 1,500?Nm (for stick), 900?Nm (for bucket), and 600?Nm (for boom). Based on these results, the path trajectories, dynamic velocity and acceleration profiles, and dimensioned parameters for optimum feed force, torques, and momentum of shovel boom-bucket assembly can be modeled and used for efficient excavation. The optimum digging forces and resistances for the hydraulic shovel excavator can also be modeled and used to predict optimum excavation performance.     

Probabilistic Capacity Models for Corroding Posttensioning Strands Calibrated Using Laboratory Results

The presence of air voids, moisture, and chlorides inside tendons or ducts was cited as a reason for the early age strand corrosion and failure in the Mid-bay, Sunshine Skyway, and Niles Channel posttensioned (PT) bridges in Florida, United States. Although rare, these incidents call for frequent inspection and structural reliability assessment of PT bridges exposed to moisture and chlorides. This paper develops and presents probabilistic strand capacity models that are needed to assess the structural reliability of such PT bridges and recommends a time frequency of inspection. A total of 384 strand test specimens were exposed to various void, moisture, and chloride concentration conditions for 12 and 21 months; the remaining tension capacities were then determined. Using this experimental data and a Bayesian approach, six probabilistic capacity models were developed based on the void type. The mean absolute percentage errors of these models are less than 4%, indicating that reasonably accurate prediction of the strand capacity is possible, when void, aggressive moisture, and chloride conditions are present.     

天铁科技成果管理工作实践

论述了科技成果管理的内容和意义,结合企业实际介绍了天铁科技管理的制度、体系及实施效果。通过科技创新体系和成果管理制度建设,“十一五”期间促进了科技成果的开发和转化,有多个项目分别列人天津市技术创新重点为项目、天津市二十项重点项目,推动了企业持续快速发展。     

天铁物料结算系统的开发设计

天铁为了解决物料结算由于手工操作出现的差错率高、控制成本困难等问题,开发设计了计算机物料结算系统。从系统的安全性、网络和硬件的实现等方面,介绍了该系统的主要功能和特点及运行情况。系统运行情况证明,该系统的开发实现了数据共享和集中存储,完善了采购和销售的各环节,程序运行稳定,提高了工作效率。     

钛渣酸解过程中物相变化特征探讨

明确物相变化是剖析钛渣酸解机理和改进酸解工艺的关键点之一.综合应用化学分析、X射线衍射(XRD)分析、矿物解离分析以及扫描电镜形貌分析对某74钛渣酸解过程中主要物相的含量、形貌变化以及Ti、Si两种元素的含量及赋存变化进行了研究.结果表明:钛渣主要由黑钛石和辉石组成,酸解过程中黑钛石含量逐渐减小,辉石含量逐渐增加;反应...