本钢热镀锌产品无公害钝化处理应用研究

简述了镀锌板无铬钝化的各种类型以及三价铬钝化的特点与机理。经过现场的调整,得到了三价铬钝化在镀锌线上的关键工艺参数,并研究了对于三价铬钝化膜产生影响的主要因素。通过对三价铬钝化膜的性能测试,可以满足下游客户的需求。     

攀钢钝化板打入国际市场

从攀钢集团公司获悉，攀钢研制的无公害钝化板，近日通过日本松下电器公司性能检验认证，松下电器公司目前已向攀钢订购500t无公害钝化板。     

钴盐在镀锡板无铬钝化中的应用研究

介绍了以磷酸盐、钴盐等组成的镀锡板无铬钝化液配方及工艺,并且采用该配方及工艺在实验室进行了镀锡板无铬钝化试验,对钝化后的镀锡板进行了耐蚀性、涂层附着力、锡层的抗氧化性能、抗硫化变黑性能以及焊接性能等试验。试验结果证明,上述各项性能均达到或接近铬酸盐钝化的镀锡板。但钝化后的镀锡板表面光泽比铬酸盐钝化的镀锡板稍差。     

钼酸盐钝化液的研制

研制了一种热镀锌钢板的无铬钝化液,采用在钼酸盐和磷酸钝化液中添加各种化学试剂,以提高钝化膜的耐腐蚀性能。采用附着力试验、醋酸铅加速腐蚀试验、中性盐雾试验和电化学试验分析无铬钝化膜的耐腐蚀性能。结果表明,此无铬钝化膜具有成本低廉且具有良好的抗白绣能力,符合欧洲RoHS指令,可以用来代替铬酸钝化。     

宝钢热镀锌无铬钝化钢板的生产

概述了热镀锌钝化及无铬钝化技术的发展历程.对比分析传统与新型的热镀锌后处理工艺得知,有机/无机复合型无铬钝化药荆具有较好的综合性能,辊涂机工艺参数对膜厚及表面质量的控制尤为重要,合理的烘干及冷却设备及工艺,是保证最终产品性能的关键.采用新型的辊涂、热风烘干生产工艺,设备投资低,产品质量稳定,生产出性能优良的热镀锌无铬钝化钢板,得到了用户的认可并进行了批量生产.     

6063铝合金钛/锆钝化与铬钝化性能对比研究

铝合金钛钝化处理是一种增强基体稳定性、耐蚀性的重要手段,钛/锆钝化为铝合金钝化的一种方式,是近年来逐步兴起的环保型技术。研究发现6063铝合金钛/锆钝化膜微观结构均匀、致密,表面布满规则微裂纹。钛/锆钝化膜具有很强耐蚀性,中性盐雾实验128 h表面仅出现轻微腐蚀,铬酸盐点滴实验持续时间为75 s,耐蚀性略低于铬钝化膜,但远高于同类其他钝化膜。钛/锆钝化膜与基体附着力较好,百格实验测试结果附着力评级为0级,杯突实验测试后膜层无开裂和脱落现象,与铬钝化膜附着性接近。与铝合金铬钝化相比,钛/锆钝化操作更加方便、环保、安全,可作为铬钝化的替代工艺。     

热镀锌钢板低铬钝化工艺的研究

对三价铬钝化的机理进行了研究，并通过初步实验，确定了低铬型钝化剂的配方，分析了钝化工艺参数对钝化膜耐蚀性的影响，确定最佳钝化工艺配方和工艺条件范围。     

锌表面稀土化学钝化及耐蚀性研究

采用三价铈盐对锌进行化学钝化处理 ,研究了有关工艺参数对锌表面稀土转化膜耐蚀性的影响 ,测量了钝化过程中试样的交流阻抗谱 (EIS)和表面显微硬度的变化 ,探讨了稀土转化膜的形成机理 ,并对成膜动力学进行了分析。随着钝化液的铈盐浓度、pH值、温度和处理时间的增加 ,稀土转化膜的耐蚀性也相应提高 ,一定条件下可达到或优于铬酸盐钝化的防蚀性能。稀土钝化成膜反应动力学符合Arrhenius方程 ,反应活化能约为 6 4 8kJ/mol。     

镀锡板的无铬钝化

介绍了镀锡板采用铬酸盐钝化对环境所造成的污染和对人们的健康所造成的危害。提出了镀锡板无铬钝化的必要性和可行性。     

热镀锌表面铈盐钝化

采用Ce(NO3)3取代铬酸盐对热镀锌表面进行钝化，通过研究钝化液组成、pH值、温度及钝化时间等因素对钝化成膜及其耐蚀性的影响，获得钝化处理最佳技术条件（质量浓度）为：Ce(NO3)320g/L,H2O2(25-35)mL/L,HBO32g/L,pH(1.4-1.75)，温度45－50℃，时间40－90s。检测分析表明，采用该研究成果可获得效果与低铬酸盐钝化相近的耐蚀性较好的金黄色钝化膜。这对于改变钝化处理毒性容易造成环境污染的现状具有积极的现实意义。     

建设监理的进度控制

工程项目的进度控制是建设监理的三大控制目标之一。本文就工程项目进度控制的进度目标、进度计划形式，动态控制方法、进度调整措施及进度目标的协调等内容作一综述。     

Visualization of Construction Progress Monitoring with 4D Simulation Model Overlaid on Time-Lapsed Photographs

The ability to effectively communicate progress information and represent as-built and as-planned progress discrepancies are identified as key components for successful project management that allow corrective decisions to be made in a timely manner. However, current formats of reporting (e.g., textual progress reports, progress curves, and photographs) may not properly and quickly communicate project progress. Current monitoring methods also require manual data collection and extensive data extraction from different construction documents, which distract managers from the important task of decision making. Therefore, to facilitate progress monitoring, this paper proposes visualization of performance metrics that aims to represent progress deviations through superimposition of four-dimensional (4D) as-planned model over time-lapsed photographs in single and comprehensive visual imagery. As a part of the developed system, registration of the 4D model with photographs, augmenting photographs, and occlusion removal for progress images are presented. While contextual information is preserved, the as-built photographs are enhanced and augmented with 4D as-planned model in which the performance metrics are visualized. The augmented photographs provide a consistent platform for representing as-planned, as-built, and progress discrepancies information and facilitate communication and reporting processes.     

Accuracy of Highway Contractor’s Schedules

Contractors are required by the Michigan Department of Transportation (MDOT) to submit a progress schedule identifying the controlling path of activities for a construction project. During the 2000 construction season, MDOT allowed contractors to submit a progress schedule with overlapping or concurrent controlling operations. Prior to this, only one activity at a time could be controlling on the progress schedule. This paper reports on the results of a research project where the focus was to examine the accuracy of the progress schedules, which only list controlling items. Eight construction projects were studied and a determination of progress schedule accuracy was made. This was done to determine if there was an increase in accuracy of the schedules when concurrent controlling operations were used. Included in the eight projects were four without concurrent controlling activities and four with concurrent controlling activities. A comparison based upon similar projects with and without concurrent activities was made. Additionally, 22 projects were analyzed, all without concurrent controlling activities, to determine the accuracy of progress schedules for two types of projects. The comparison revealed that, in three of the four cases, the accuracy of progress schedules increased with the allowance of concurrent controlling activities. The 22 projects revealed that the accuracy of progress schedules varied considerably. It was also determined that contractors overestimated the duration of activities included in progress schedules.     

Linking goal progress to subjective well-being at work: The moderating role of goal-related self-efficacy and attainability.

Although goal progress is often hypothesized to be positively linked to well-being, existing research points to an inconsistent relationship and suggests that potential moderators need to be examined. This longitudinal study investigated whether 2 aspects of goal cognition—goal attainability and self-efficacy—influence the relationship between goal progress and well-being (viz., job satisfaction and emotional exhaustion) in a sample of 172 nurses. Work goal progress was not directly associated with well-being. Rather, the link between goal progress and well-being was moderated by goal cognition. Individuals who started off with unfavorable goal cognitions but who managed to achieve goal progress reported an increase in well-being, compared with those who had favorable goal cognitions and similar rates of progress. Progress appears to have compensated for low initial goal cognition in the prediction of well-being, and high initial goal cognition appears to have undermined this predictive relationship. Also, goal progress was associated with an increase in self-efficacy and goal attainability from Time 1 to Time 2. Results are discussed in relation to goal theories and the concept of self-correcting goal cycles. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Management of Daily Progress in a Construction Project of Multiple Apartment Buildings

This paper presents the methods used and a case study of a project management system (PMS) to manage daily progress in the construction of multiple apartment buildings in South Korea. A dilemma encountered in previous research in the field of progress management is that efforts to enhance data accuracy cause the data handling workload to soar. A main feature of the method presented by the writers for calculating the budgeted cost work schedule is to allocate the project budget into control attributes, activities, and tasks that are defined in a work-packaging model, according to daily weight value. The method offers enhanced practicability by reducing data-handling workloads while not sacrificing the rationale of progress management. The work-packaging model is designed to enable project managers to acquire and process data for progress management at various levels of detail. The budgeted cost of work performed is measured daily at the tasks level using the earning percentage rate from daily work reports. The implementation of PMS focuses on functions to distribute the budget according to daily weight values and acquire the earning percentage from the daily work report. The PMS was applied to a construction project of 54 apartment buildings in South Korea. The case study of its use shows that company headquarters and managers in the field can acquire data for progress management without additional data-handling workloads, and can analyze the progress daily at various levels of detail.     

Linking Time-Lapse Digital Photography and Dynamic Scheduling of Construction Operations

A dynamic scheduling system that links digital movies of construction activities, a CPM schedule, and progress control of construction has been developed. A time-lapse technique has been used in such a way that months of construction performance can be watched in minutes. A method to produce a digital movie has been developed allowing thousands of pictures to be stored in, and managed by, microcomputers under a Windows environment. A recording system has been introduced enabling the user to specify the day-by-day progress achieved in activities undertaken, allowing the program to link the playback movie with the progress observed on the construction field. A CPM engine has been developed to produce a Gantt chart. A procedure to build a histogram of expected cumulative percentage of progress is presented. An animation engine has been built in order to generate new bars reflecting the progress reported on the bar chart and the histogram, working in synchrony with the playback movie.     

锡的原子吸收光谱分析

综述了１０年来国内用原子吸收法测定锡的近况。引文５８篇。     

Shapes of early change in psychotherapy under routine outpatient conditions.

Although improvement of clients' state is a central concern for psychotherapy, relatively little is known about how change in outcome variables unfolds during psychotherapy. Client progress may follow highly variable temporal courses, and this variation in treatment courses may have important clinical implications. By analyzing treatment progress using growth mixture modeling up to the 6th session in a sample of 192 outpatients treated under routine clinic conditions, the authors identified 5 client groups based on similar progress on the short form versions of the Clinical Outcomes in Routine Evaluation-Outcome Measure. The shapes of early change typical for these client groups were characterized by (a) high initial impairment, (b) low initial impairment, (c) early improvement, (d) medium impairment with continuous treatment progress, or (e) medium impairment with discontinuous treatment progress. Moreover, the shapes of early change were associated with different treatment outcomes and durations, and several intake variables (depression, anxiety, and age) enabled prediction of the shape of early change and/or prediction of individual treatment progress within client groups with similar shapes of change. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

我国铝电解技术的新进展

论述了近几年我国铝电解技术发展的最新进展，及应用这些新技术发行老企业，改造旧设备的情况，大大促进了企业技术进步，增加了企业经济效益。     

Toward the use of a standardized assessment for young children with autism: current assessment practices in the UK

Little is known about the progress of autistic children following specific interventions in England. Nor do we know how frequently standardized assessments are used to monitor progress or to evaluate specific educational interventions. The reports of 75 children with autism, for whom special educational provision had been determined by a local education authority, were reviewed. Parents were interviewed and educational psychologists were contacted for details of any norm-referenced assessments. Of these children, 39 percent had no standardized assessments before education authorities determined their provision, and only 9 percent had follow-up assessments that could be used to evaluate progress. Children with autism in the UK rarely have sufficient assessments to allow an objective evaluation of their progress. There is currently no standardized assessment protocol to prescribe a specific educational intervention, to evaluate the progress of children or to make comparisons between interventions. We recommend the development of such a protocol.