利用计算机搞好拜耳法生产氧化铝物料平衡的实践

利用计算机对拜耳法生产氧化铝过程中的旬盘存统计数据进行处理，并与生产平衡状态下的有关标准量和旬初量相比较，经计算机自动分析，判断得出反映生产物料平衡的数据和有关物料量变化趋势，结合生产实际，采取相关措施，搞好物料平衡。     

长壁式陷落采矿法生产准备矿量的管理

王村铝土矿采用长壁式陷落法采矿，生产准备矿量的计算为开拓矿量由采区放矿轮子坡担负矿量确定；采准，回采矿量以矿块一年和半年的生产量计算。同时加哟管理，做好边角矿的准备，使生产准备矿量及其保有时间实际地反映了矿量的贮存量，满足了生产需要。     

按同时生产矿块计算三级矿量与生产管理对策

为适应黄金市场走势与实现有效的生产管理 ,本文试图结合玲珑金矿生产实际进行了“按同时生产矿块数”计算合理的三级矿量 .计算结果表明 :三级矿量比例严重失调 ,矿量不均衡系数和生产能力不均衡系数分别为 1 .2 5和 1 .2 4 ;采准矿量与实际保有矿量比值为 2 .5,意即保有储量严重不足 ,应加大开拓与备采矿量的力度才能保证三级矿量的平衡 .据此 ,本文提出了保障生产衔接 ,实现三级矿量平衡的三点对策     

按同时生产矿块计算三级矿量与生产管理对策

为适应黄金市场走势与实现有效的生产管理，本文试验结合玲珑金矿生产实际进行了“按同时生产矿块数”计算合理的三级矿量，计算结果表明：三级矿量比例严重失调，矿量不均衡系数和生产能力不均匀衡系数分别为１．２５和１．２４，采准矿量与实际保有矿量比值为２．５，意即保有储量严重不足，应加大开拓与备采矿量的力度才能保证三级矿量的平衡。据此，本文了保障生产衔接，实现三级矿量平衡的三点对策。     

露天转井下开采矿山生产矿量准备及保有指标的探讨

对露天转井下开采矿山的生产矿量准备及保有指标进行了探讨。指出现场生产矿量准备的基本要求,分析总结厂坝铅锌矿复产以来矿山实际开拓、采准、备采工程控制的各级生产矿量,提出了建设性管理思路及应对措施。     

露天转井下开采矿山生产矿量准备及保有指标的探讨

对露天转井下开采矿山的生产矿量准备及保有指标进行了探讨。指出现场生产矿量准备的基本要求．分析总结厂坝铅锌矿复产以来矿山实际开拓、采准、备采工程控制的各级生产矿量，提出了建设性管理思路及应对措施。     

浅谈河台金矿生产矿量的合理储备

在市场经济条件下 ,生产矿量的储备水平对企业经济效益有直接影响 ,多了造成资金积压 ,财务和维护费用增加 ;少了则不能维持正常生产 .各矿山的矿床赋存状态、脉幅、开采方法均不同 ,所以各级矿量的保有期限亦不相同 .本文通过对河台金矿的生产矿量管理现状进行分析 .引入存贮论的观点和方法来建立河台金矿生产矿量的合理保有水平和管理模型 .     

浅谈河台金矿生产矿量的合理储备

在市场经济条件下,生产矿量的储备水平对企业经济效益有直接影响,多了造成资金积压,财务和维护费用增加;少了则不能维持正常生产,各矿山的矿床赋存状态、脉幅、开采方法均不同,所以各级矿量的保有期限亦不相同。本文通过对河台金矿的生产矿量管理现状进行分析,引入贮论的观点和方法来建立河台金矿生产矿量的合理保有水平和管理模型。     

冷返矿波动对莱钢3×105m2烧结机生产的影响及其控制

分析了冷返矿质和量波动对生产操作和烧结矿产质量的的影响,提出了实现控制最佳返矿量,促进生产良性循环应该采取的对策.     

严格按矿山规律和政策办事

矿量赤字是指矿量负平衡,这里所说的矿量,包括地质矿量和生产矿量,本文详细论述了产生矿量赤字的原因及其危害,提出了改进意见。     

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.     

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。     

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.     

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.     

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)     

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。     

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.