铜精矿预干燥烟气处理系统的改造和生产实践

简述了贵溪冶炼厂铜精矿预干燥烟气处理系统改造前的基本情况,分析了改造前预干燥烟气处理系统存在的问题和改造目标,详细论述了改造前和改造后的预干燥烟气处理的工艺流程,介绍了改造前和改造后的运行数据,并对本次改造的技术特点进行了总结。     

高压变频器在炼轧厂脱硫除尘风机上的应用

通过对酒钢宏兴炼轧厂脱硫除尘风机的高压变频节电改造的介绍,详细叙述了改造的目的、技术方案、改造过程。分析了改造效果及效益评价。最后阐明节能改造的意义。     

宣钢矩形坯连铸机高效化改造

传统连铸机实现高拉速、高质量、高作业率需要实施高效化改造。就宣钢二台矩形坯连铸机实施高效化改造存在的困难进行了论证,介绍了高效化改造应达到的目标,提出了实施高效化的基本思路和技术保证及高效化改造的具体内容,最后计算了与高效化改造有关的技术参数,并把改造前后的生产指标进行了对比分析和经济效益分析。实践证明,高效化改造能给钢厂带来巨大的经济效益,传统连铸机实施高效化改造是钢厂今后节能降耗,结构优化的主要途径之一。     

太钢峨口球团厂2号竖炉大修技术改造

介绍了峨口球团厂２号竖炉的大修改造,包括：干燥床改造、导风墙和大水梁改造、齿辊卸料系统改造和液压站改造等。由此,大幅度提高了竖炉利用系数和竖炉作业率。     

基于数字化技术的马钢电炉变电所应用实践

通过马钢电炉变电所数字化改造的实践,找到冶金系统变电所数字化改造的途径和方法,总结了冶金系统变电所数字化改造的技术特点,为冶金系统变电所数字化改造提出了可行的改造途径。     

高炉鼓风机风量风压控制系统改造项目的分析与研究

介绍了高炉鼓风机风量风压控制系统改造项目,包括改造目的、改造方案、改造内容、改造的实施过程.分析了改造实施过程中存在的问题,项目技术重点、难点、创新点、技术目标完成情况,并对改造后的经济效益分析及推广应用前景进行了探讨.     

城中村改造中的博弈关系分析与应对

介绍了城中村现象概况,运用博弈理论分析了城中村改造过程中各改造主体的博弈关系,揭示了改造过程中的主要利益冲突,并在此基础上提出各改造主体的合理利益,最后以保定市城中村改造为基础,提出了城中村改造的应对策略.     

型钢加热炉的大修改造

分析了型钢生产线步进梁式加热炉存在的问题。结合加热炉大修改造,介绍了炉体结构改造及采用的新技术、新工艺与新材料。结果表明,大修改造解决了步进梁式加热炉存在的问题,改造效果显著。     

鞍钢二炼钢厂小方坯连铸机高效化改造

介绍了连铸技术国家工程研究中心对鞍钢二炼钢厂小方坯连铸机实施高效化改造的情况。改造采用了连续锥度结晶器、半板弹簧振动装置、拉矫机的改造、火焰切割等关键技术。说明改造前后机组中主体设备机构特点 ,并阐述了小方坯连铸机改造的投资与效益     

采用合同能源管理(EMC)模式实施节能改造的实践

简述了合同能源管理模式的概念和特点,以柳钢实施的变频节能改造、水系统节能改造、照明节能改造等介绍了应用合同能源管理模式实施节能改造的效果,并对采用该模式实施节能改造提出建议。     

Within-child associations between family income and externalizing and internalizing problems.

Within-child associations between family income and child externalizing and internalizing problems were examined using longitudinal data from the NICHD Study of Early Child Care and Youth Development (2004a, 2004b; N = 1,132). Variations in income effects were estimated as a function of whether families were poor, whether mothers were partnered, and the number of hours mothers and their partners were employed. On average, children had fewer externalizing problems during times when their families' incomes were relatively high than during times when their families' incomes were relatively low; the estimated benefits of increased income were greatest for children who were chronically poor. For both externalizing and internalizing problems, income was most strongly associated with problems when chronically poor children's mothers were partnered and employed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

FeCuNbSiB粘结磁体的制备及磁性能研究

通过2种途径将熔体快淬法制得的FeCuNbSiB非晶薄带制成环状粘结磁体。一是将非晶薄带进行晶化处理,再将晶化后的薄带粉碎成不同粒度的粉末,然后与粘结剂相混合制成粘结磁体。二是将非晶薄带直接粉碎成不同粒度的粉末,再将此粉末进行晶化处理,将晶化后的磁粉与粘结剂相混合制成粘结磁体。分析了磁粉粒度和模压压力对粘结磁体性能的影响。并对两种粘结磁体的性能进行比较。结果表明,第一种方法制备的粘结磁体的性能优于第二种。     

Reliability of Settlement Prediction—Case History

A geotextile-reinforced embankment was built over soft ground. Staged construction and vertical prefabricated drains were used to obtain strength gain via consolidation of the foundation material. Settlement and pore pressure were measured as a part of construction control. Settlement, differential settlement, and rate of consolidation were predicted by simple models. Uncertainties in the predictions were evaluated to assess the reliability of the predictions. The estimated errors were compared with the measured values, and major contributors to prediction errors were identified.     

钢管标准化工作的思考

综观钢管专业领域内的国内、国际现状和发展趋势,重点介绍了钢管专业标准化工作基本情况、作用和主要成绩;对目前标准化工作存在的主要问题及原因进行分析;指出在国内、国际环境下对标准化工作提出的要求;深入探讨钢管专业标准化工作的重点任务、领域及重点项目。     

Evaluation of Flexural Behavior and Serviceability Performance of Concrete Beams Reinforced with FRP Bars

Flexural behavior and serviceability performance of 24 full-scale concrete beams reinforced with carbon-, glass-, and aramid-fiber-reinforced-polymer (FRP) bars are investigated. The beams were 3,300?mm long with a rectangular cross section of 200?mm in width and 300?mm in depth. Sixteen beams were reinforced with carbon-FRP bars, four beams were reinforced with glass-FRP bars, two beams were reinforced with aramid-FRP bars, and two were reinforced with steel, serving as control specimens. Two types of FRP bars with different surface textures were considered: sand-coated bars and ribbed-deformed bars. The beams were tested to failure in four-point bending over a clear span of 2,750?mm. The test results are reported in terms of deflection, crack-width, strains in concrete and reinforcement, flexural capacity, and mode of failure. The experimental results were compared to the available design codes.     

电流变流体和磁流变流体在工程上的应用

阐述了ER和MR流体的组成及发展过程，并对它们的物理和化学性能进行了对比分析，总结了现有ER和MR流体的理论计算模型、应用领域和应用状况，提出了ER和MR流体阻尼装置的分类方法及使用时应注意的几个问题，最后对ER和MR流体现存的问题和发展方向作了分析和展望。     

微波消化技术在铁矿石分析中的应用研究

通过微波高压密封法对沉积物样品的消解,采用正交试验设计法系统地研究了微波消解中如试剂种类、压力控制和消解程序等影响因素,确定了最佳消解条件。用微波高压密封法对不同矿源和形态的铁矿石样品进行消解,方法快速、简单,测定结果准确度高,相对标准偏差小于0.15%。本法亦可用于其他矿石样品和环境样品的消解。     

Seismic Response of Interior RC Beam-Column Joints Upgraded with FRP Sheets. I: Experimental Study

In this paper, efficiency and effectiveness of carbon fiber-reinforced polymers (CFRP) in upgrading the shear strength and ductility of seismically deficient beam-column joints have been studied. For this purpose, four reinforced concrete interior beam-column sub-assemblages were constructed with nonoptimal design parameters (inadequate joint shear strength with no transverse reinforcement) representing preseismic code design construction practice of joints and encompassing the vast majority of existing beam-column connections. Out of these four, two specimens were used as baseline specimens (control specimens) and the other two were strengthened with CFRP sheets under two different schemes (strengthened specimens). In the first scheme, CFRP sheets were epoxy bonded to the joint, beams, and part of the column regions. In the second scheme, however, sheets were epoxy bonded to the joint region only but they were effectively prevented against any possible debonding through mechanical anchorages. All four subassemblages were subjected to cyclic lateral load histories so as to provide the equivalent of severe earthquake damage. Further, the damaged control specimens were repaired after filling the cracks through epoxy and wrapping them with CFRP sheets under the same two above-mentioned schemes. These repaired specimens were subjected to the similar cyclic lateral load history and their response histories were obtained. Hence, a total of six specimens were tested: two control; two strengthened; and two repaired. Response histories of control, repaired, and strengthened specimens were then compared. The results were compared through hysteretic loops, load-displacement envelopes, column profiles (maximum horizontal displacements of column along its height), joint shear distortion, ductility, and stiffness degradation. The comparison shows that CFRP sheets improve the shear resistance of the joint and increase its ductility. Results of two chosen schemes of strengthening were also compared and the importance of beam upgrading was highlighted.     

Time estimation in process-reactive schizophrenia.

Process and reactive schizophrenics, and reactive schizophrenics and normals were compared as to their responses on a perceptual time-estimation task. Null hypotheses being tested were that groups would not differ in variability or accuracy of response. Schizophrenic (45) and normal (15) subjects were selected from the male patient population and hospital employees, respectively, of a Veteran's Administration hospital. Schizophrenics selected for the study were classified by means of the Abbreviated Becker Elgin Scale. Subjects were individually administered a time-estimation task consisting of seven stimulus cards which were tachistoscopically presented, with exposure speeds at 10, 20, and 30 seconds for each card. Judgments of exposure times were converted into scores based upon ratios of estimated time to actual time. Scores (three) for each card were totaled. Groups were then compared on each of the stimulus cards by means of two-tailed t tests. In accuracy of estimation, process schizophrenics demonstrated significantly less accuracy than did reactives on four of the seven cards; no differences were shown between reactives and normals in accuracy of estimation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

抑制剂对超细WC-Co硬质合金性能的影响

采用高能球磨、真空烧结工艺制备超细WC-Co硬质合金。研究了抑制剂的预磨时间对WC-10Co硬质合金粒度及烧结试样性能的影响。对比了相同抑制剂配比对Co含量不同的硬质合金性能的影响以及稀土对硬质合金性能的影响。结果表明:通过对晶粒长大抑制剂的预磨,其粒度明显细化。加入预磨时间为120 h的抑制剂,WC-10Co硬质合金的平均粒度为0.3μm,硬度达到92.1 HRA。相同抑制剂配比的硬质合金,硬度和致密度随Co含量的降低而增大。稀土氧化物Y2O3的加入,有利于改善硬质合金的性能。