40000m~3/h空分设备主换热器的设计及制造

通过对进口 4 0 0 0 0m3 /h空分设备主换热器进行结构分析及对比模拟计算 ,用国产传热翅片进行设计、采用真空钎焊工艺制造的主换热器 ,经并网运行 ,设计指标优于原空分设备 ,为今后成套大型空分设备板翅式换热器国产化设计、制造创造了条件。     

Effects of computers on Japanese schools

In this paper I consider how the computer can or should be accepted in Japanese schools. The concept of teaching in Japan stresses learning from a long-term perspective. Whereas in the instructional technology, on which the CAI or the Tutoring System depends, step-by-step attainments in relatively short time are emphasized. The former is reluctant in using the computer, but both share the Platonic perspective which are goal-oriented. However, The Socratic teacher, who intends to activate students' innate disposition to be better, would find another way of teaching and use of the computer.     

本钢炼钢厂转炉炉底上涨原因分析及防治实践

根据本钢炼钢厂生产实际,针对转炉炉底上涨的原因进行了系统分析,并提出了具体的炉底控制与处理的改进措施。从设备优化、参数、具体操作等方面入手,详细阐述了本钢炼钢厂转炉炉底控制实践经验。     

企业社会责任下考虑促销投入的供应链优化决策

基于企业社会责任的现实背景,首先研究集中式供应链中考虑企业社会责任的情形,然后研究零售商承担企业社会责任下的分散式情形和收益共享契约情形的最优决策.研究结果表明:集中式情形下供应链的最优利润关于企业社会责任关注水平递减.在分散式情形下,零售商的最优利润关于企业社会责任关注水平递减,而制造商的最优利润关于企业社会责任关注水平递增.在收益共享契约情形时,当收益共享系数相对较小或较大时,零售商的最优利润关于企业社会责任关注水平递增,而当收益共享系数在中间的给定区间时,零售商的最优利润关于企业社会责任关注水平递减,制造商的最优利润关于企业社会责任关注水平递增.当零售商的企业社会责任关注水平较低时,社会总福利随着企业社会责任关注水平递增;当零售商的企业社会责任关注水平较高时,社会总福利随着企业社会责任关注水平递减.最后进行算例分析,并给出一些管理启示.     

使用内力复变量表示法进行压力容器单元计算(英文)

本文工作是作者对密封水泵强度一系列研究的延续．在论文‘圆柱与球壳连接的压力容器强度分析’的基础上着手,提出一种新的技术,计算连接刚性抽水管的水泵底部单位球单元的应力．该方法用复变量表示抽水机工作时产生的内力．     

消费者性格对促销方式偏好及促销反应影响

目的研究消费者性格在促销方式偏好和促销反应上的差异。方法采用量表的形式对143名大学生进行测量。结果消费者在促销方式偏好及促销反应行为方面受性格的影响。情绪型、冲动型、多疑型消费者青睐于免费试品、购物赠品;开放型、谨慎型消费者在面对促销时保有更高的品牌忠诚度。同时消费者对价格折扣更青睐,则对购物抽奖的喜爱度偏低;在面对促销时消费者会购买加速,但品牌转换行为较低。除此之外,人格特质对促销方式偏好及促销反应行为具有预测能力。结论不同性格的消费者在促销方式以及促销反应行为上存在一定的差异性。     

Trajectory planning/re-planning for satellite systems in rendezvous mission in the presence of actuator faults based on attainable efforts analysis

The objective of fault-tolerant control (FTC) is to minimise the effect of faults on system performance (stability, trajectory tracking, etc.). However, the majority of the existing FTC methods continue to force the system to follow the pre-fault trajectories without considering the reduction in available control resources caused by actuator faults. Forcing the system to follow the same trajectories as before fault occurrence may result in actuator saturation and system's instability. Thus, pre-fault objectives should be redefined in function of the remaining resources to avoid potential saturation. The main contribution of this paper is a flatness-based trajectory planning/re-planning method that can be combined with any active FTC approach. The work considers the case of over-actuated systems where a new idea is proposed to evaluate the severity of faults occurred. In addition, the trajectory planning/re-planning approach is formulated as an optimisation problem based on the analysis of attainable efforts domain in fault-free and fault cases. The proposed approach is applied to two satellite systems in rendezvous mission.     

Global Perspectives on Fetal Alcohol Syndrome: Assessing Practices, Policies, and Campaigns in Four English-Speaking Countries.

Maternal alcohol consumption during pregnancy places the fetus at risk for a number of neurological abnormalities and functional impairments. These deficits are 100% preventable by abstaining from alcohol use during pregnancy. Nevertheless, the worldwide prevalence of Fetal Alcohol Syndrome (FAS), the most severe outcome of prenatal alcohol consumption, is estimated at 0.97 cases per 1,000 live births (see May & Gossage, 2001). This paper examines awareness of the problem in Canada, the United States, the United Kingdom, and Australia along three dimensions: 1) the relationship between alcohol consumption rates and the incidence of FAS; 2) government action and policy creation; and 3) prevention/intervention initiatives and educational efforts. The extent of knowledge within each country affects, and is affected by, the level of research activity, the emphasis on policy creation, and the initiatives that drive educational efforts. At present, Canada and the U.S. have the highest levels of activity and a clear recognition of the problem. Activity in the U.K. and Australia is at the grass-roots level, although some promising movements toward greater public and professional awareness have begun. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Application of Megan's law to juveniles.

This article examines (a) the history of registration and notification statutes for sex offenders and the concerns and legal challenges they have faced, (b) psychology's limited knowledge about normal versus abnormal sexual development, and (c) research that suggests rates of recidivism for sexual offenses may be lower for juveniles than for adults who have been discovered and received punishment and/or treatment. Although the behaviors of juvenile and adult sex offenders may appear similar, the underlying mechanisms triggering the behaviors may be different or juveniles' patterns of behaviors may be less established, accounting for some of the observed differences in recidivism rates. Although the authors recognize the critical objective of protecting victims and potential victims, this article focuses on intervention efforts with juvenile sex offenders. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

循环球式液压助力转向系统建模仿真及试验验证

为研究循环球式液压动力转向器对汽车转向性能的影响,采用多领域统一建模语言Modelica,在仿真软件Dymola环境下建立了转向器的机械子系统模型和液压子系统模型,并将所建模型纳入已有的该车转向系统机械模型,构造了完整的液压助力转向系统模型.在仿真和实车环境下分别进行了原地有助力转向和转向轻便性两个试验,试验结果表明所建的转向器模型正确,能准确反映实车的转向性能,为转向器的优化提供理论依据.