A.S法脱硫工艺的浅析

简要介绍煤气A.S法脱硫工艺的现状与存在的问题,根据A.S法存在的问题提出解决问题的方法。     

高职教师评价方式、方法及模式探讨

本文对我国当前高职院校教师评价方式、方法及模式存在的问题进行了阐述,描述了当前高职教师评价体系中存在的问题,分析了创新高职教师评价方式、方法及模式的必要性,提出了创新高职教师评价方式、方法及模式的若干建议.     

安阳二炼钢抽雾风机故障分析

论述了风机产生的故障原因和分析故障的方法．以及采用的检测手段。并针对风机存在的实际问题采取了相应的解决方法,彻底解决了风机存在的问题。     

风根秤应用于铜精矿计量的研究与探讨

提出了风根秤应用在铜合成炉中存在的问题,分析了问题的原因及进行设计改造的方法及原理,并通过改造有效地解决了存在的问题,为铜合成炉生产提供便利。     

应用统计方法 提高QC小组活动水平

通过统计方法在质量管理活动中的实际应用,阐述统计方法应用,有助于提高QC小组活动水平,包括统计方法应用存在的问题,及针对问题采取的措施.     

熔铸锌浮渣深度处理的生产实践

叙述了蒙自矿冶公司锌熔铸浮渣处理生产初期存在的问题并分析了问题存在的原因;介绍了通过技术创新、设备改造等解决问题的方法及产生的效果.     

基桩检测探讨

根据基桩检测分类,论述了桩基的检测方法和对基桩施工质量的影响因素,探讨了基桩检测中存在的问题、检测方法及设备存在的局限性。     

简析电子提单在我国推广使用存在的问题

鉴于提单在国际贸易与国际航运中存在着提单作骗、船到货到而提单未到从而使收货人提不到货等问题,给国际贸易运输造成很大的问题.解决问题的方法之一是使用电子提单.对于如何更好地推广使用电子提单,是当前学术界、业界探讨的主要问题.本文主要针对这些存在的问题进行实证分析及提出解决方法.     

当前钢轨在线探伤中所存在的问题与说明

简要从探伤方法、探头各项特性、在线超声探伤与手动超声探伤的差异方面,指出钢轨在线探伤所存在的技术问题,并对以上存在的问题加以详细说明。     

连轧厂高压系统存在的问题及其解决方法

针对连轧厂高压系统目前存在的问题进行分析，找出问题产生的原因，提出解决方法及措施。     

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。     

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.     

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.     

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.     

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。     

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...     

Behind closed doors: In-home workers' experience of sexual harassment and workplace violence.

The authors developed and tested a structural model predicting personal and organizational consequences of workplace violence and sexual harassment for health care professionals who work inside their client's home. The model suggests that workplace violence and sexual harassment predict fear of their recurrence in the workplace, which in turn predicts negative mood (anxiety and anger) and perceptions of injustice. In turn, fear, negative mood, and perceived injustice predict lower affective commitment and enhanced withdrawal intentions, poor interpersonal job performance, greater neglect, and cognitive difficulties. The results supported the model and showed that the associations of workplace violence and sexual harassment with organizational and personal outcomes are indirect, mediated by fear and negative mood. Conceptual implications for understanding sexual harassment and workplace violence, and future research directions, are suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Design Error Classification, Causation, and Prevention in Construction Engineering

Construction and engineering practitioners have found it increasingly difficult to learn from their mistakes, particularly with regard to the prevention, identification and/or containment of design errors. Yet, design errors have been the root cause of numerous catastrophic accidents that have resulted in the death and injury of workers and members of the public. This paper examines and classifies the nature of error and design error causation in construction and engineering projects. A review of the normative literature revealed that design errors are caused by an array of factors that can work interdependently. A generic framework is developed that classifies design error according to people, the organization, and project is presented. The paper suggests that people, over and above organizational and project management strategies, have the greatest propensity to reduce errors through the process of situated learning and knowing. This is because the working environment provided by an organization and the processes used to deliver construction and engineering projects influence the nature and ability of people to undertake tasks. Consequently, there is no single but rather a multitude of strategies that need to be adopted in congruence to reduce design errors so that safety and project performance are ameliorated.