基于催化重整脱氯的轴金属高分子材料制备新工艺

高分子材料是我们在生产以及生活的过程中比较常用的一种化学的合成材料,对我们日常的生产以及生活非常重要,起着不可替代的作用,高分子材料一般为人工的制造,传统的制造的模式往往存在着这样或者那样的不足,所以,近些年,我国的许多的科学家通过积极地学习新工艺以及对高分子材料的研究,创造了许多的新的方法,本文主要的讲述基于催化重整脱氯的轴金属高分子材料制备的新工艺的相关的概念。     

浅谈矿产资源的开发与地质环境保护

近年来我国社会的发展过程中,我国的矿产的产值,不断的提升,带来了较大的经济效益,但是随着开采量的不断的增加,给环境带来的污染是不可忽视的。党在十八大提出,要以文明的生态环境,作为宏伟的目标,指出了要将建设生态的文明,放在十分重要的位置上,文章针对矿产资源的开发,地质环境的关系,提出指导性的建议。     

数控机床智能化的主要技术特征

随着时代和科技的不断进步,数控机床技术的发展不断的优化和完善,整体的数控机床的发展趋势逐步向智能化发展。而对于数控机床的技术的开发和应用也逐渐的受到相关的机床生产商和采购者的重视。因而从实际上来讲数控的智能化发展不仅对机床所加工的产品的质量有一定的影响,对于加工的效率的影响也是比较大的。在此基础上,本文将对数控机床智能化的主要技术特征进行有效的分析和研究,从而使得数控机床技术能够更加健康的发展和进步。     

自然铜矿石样品的加工及分析测试方法研究

矿石中含有多种天然物质,矿采对于矿物质的的测定十分重要,有效的开采所需要的矿物质,可以节省大量的人力物力,同时也关系到日后的资金收益。现代社会正处于稳定发展的阶段,所以对矿产的需求比较高,例如电子产业,军事科技等等。有效的利用已开采的矿物质,去除其中的杂质是十分重要的。一块普通的矿石中,往往含有多种杂质,精确的分析其中的化学元素可以更加准确的确定其开采地的矿物质的基本成分。取样是测定的基本前提,铜矿石的元素测定是对矿石本身而言。所以找到有代表性的样品具有重要的意义。本文简述了自然铜矿石的样品加工及其分析的方法。     

马克思感性的自然概念及当代启示

马克思的自然概念是一个具有多重维度的整体性概念.马克思感性的自然概念全面地阐述了人与自然、历史与自然、自然科学与人文科学的辩证统一关系.感性的自然强调的是自然与人的相关性;人化的自然是对人与自然之间认识和实践的对象性关系的概括;历史的自然是对在生产实践基础上历史与自然统一的关系的概括;人本学的自然是对自然科学与人文科学的辩证统一关系的说明;价值的自然是对人与自然之间存在着满足与被满足、需要与被需要的价值关系的概括.马克思的感性自然概念对于理解与建设生态文明具有多方面的启示.     

浅谈英语课堂的有效教学

提高课堂教学的有效性,精心设计生动的、富有情趣吸引力的、形式多样的活动。教学的有效性是教学设计的生命,是学校教学活动的一个基本追求,它直接关系到教学的质量和人才的培养。加强教师自身素质的提高是课堂教学的有效性的重要前提,教师本身的能力高低会直接的影响到课堂教学质量。     

关于端电设备制造和维修的几个问题

整流机组是整流供电的核心设备。对于整流机组而言，合理的方案选择，精良的设计制造，正确的使用操作，以及到位的维护保养是其安全运行的基本保证。方案选择得不合理和设备制造中存在缺陷造成了先天的隐患。不正确的操作和缺乏及时到位的维护会产生后天的祸患。尽可能地排除先天的隐患，避免后天的祸患就是我们要研究的问题和要做的工作。维护检修是其中一项重要的工作。及时到位的维护检修可以发现和排除设备的隐患，保证设备处于良好的状态。即使是很好的设备，缺乏必要的维护保养也是会出问题的。本文重点就供电整流设备的维护和检修问题，结合抚顺铝厂的经验并参照国外公司的产品说明，谈谈个人的粗浅看法。     

马克思主义视域下人性的二重性解读

在人性的问题上,马克思主义之前的哲学往往用静止的、孤立的、片面的、抽象的、形而上学的思维方法来解读人性.马克思主义哲学以实践为出发点,运用辩证的思维方式,对人性作出了全新的二重性的解读,认为人性是全面的、发展的、辩证的,是矛盾的统一体,是能动与受动、客观与主观、具体与抽象、变与不变的统一,是一个系统的、开放的、复杂的有机整体.     

浅谈环境艺术设计中的水景设计

本文从实际操作的层面探讨了环境艺术中重要的一个环节水景的设计工作.丈中已经充分的说明了水景设计是我们人类在生存的地表与其他的一些因素的构成关系所推行的整体性的研判,从这里面找寻出我们人类与大自然和谐共处的发展模式,减少我们人类的行为对于环境的种种破坏,让我们的生态环境能够得到及时的改善,加强我们人类的文明价值,实现人与自然的和平相处.     

部分城市生产资料价格周报

一品名规格条件I北京沈阳天津武汉长沙上海成娜西安白银兰妞广州.曰,朴挂牌26000260的2580026500262的25,502石印02?加O25800,月1,f成交257的256加257002630025?的肠以力舫以冲2650025500自口几n几内内挂称‘168的168的1650016别沁168的1645017加01‘创沁16600下口J、U才、肠月J成文166的164001630016500163的164加17的016右的16200自几1什挂脚6,的72Q0690069的7(期】1即0飞95012的70的,口1,f成交68加‘900680068的69的,1506加069的69的山立,朴挂脚95的9500980097的匀55095509夕00肠阅95的,甲1心宁成交94的9300950096加匀5的95的躺0095的…     

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...     

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.