镀锌钢板电阻点焊电极的深冷处理工艺研究

提出了一种新的提高镀锌钢板点焊电极寿命的方法,即深冷处理工艺。对深冷处理电极及未深冷处理电极点焊寿命进行了试验,并比较了不同深冷处理工艺对电极寿命的影响。试验结果表明:深冷处理可显著提高镀锌钢板点焊电极的工作寿命,不同的深冷处理工艺对电极寿命影响不同;保冷温度对寿命影响较大,而保冷时间对电极寿命影响较小。介绍了电极深冷处理工艺及深冷处理电极寿命试验过程。     

关于提高沈阳市道路通行能力的探讨

本文根据对沈阳市的交通调查及研究 ,总结分析了十年来采取旨在提高道路通行能力的行之有效的技术措施。     

自卸车联动式开合机构的原理及系统压力分析

基于自卸车传统开合机构设计方法,在车厢举升起始阶段用液压举升系统的动力实现车厢后板的自动开启;液压系统的设计避免了在举升过程中后板自动回落,机械式自动锁紧装置提高了机构可靠性。通过建立运动分析数学模型,提出了机构工作过程中压力和角度的函数关系,证明了机构设计的可行性,更好地满足自卸车使用要求。     

交通噪声经济损失估算方法研究

噪声污染带来的经济损失是多方面和难以计算的。本文以交通噪声为例,运用环境经济学的观点和方法,介绍了估算交通噪声污染损失的3种常用方法:损害费用法、意愿型调查评估法和防护费用法,并对它们进行了比较研究。     

舷间液舱模型声振耦合特性及声辐射控制

水下航行体内部设备产生的振动能量通过舷间液舱侧板和舱内水介质两个途径的耦合和传递,在外场产生辐射噪声,成为机械噪声控制的一个短板。文中以舷间液舱外场声辐射控制为背景,采用解析方法建立了液舱结构振动与内外声场的声振耦合模型,计算分析了液舱侧板及液舱内部介质对振动传递和外场声辐射的影响,结果认为敷设声学覆盖层并减小液舱侧板材料刚度能够有效控制外场辐射声功率。文章为舷间液舱的"声短路"控制提供了新的思路。     

技术创新系统管理 促进“九五”铁路建设事业蓬勃发展

本文详细论述了我国铁路建设事业的发展,介绍了“九五”期间我国铁路的建设任务,组 织铁路建设会战建设项目的完成与路网规模扩展情况,铁路建设依靠科技铁路工程水平的提 高,铁路工程质量的提高,建立“统一开放、竞争有序、运行观范”的铁路有形建设市场,创造公开、公证、公平的竞争环境,以及完善了系统管理规章。     

中国智能公共交通系统框架与实施方案研究

先进的公共交通系统(APTS)是智能运输系统(ITS)的重要组成部分,本文的研究内容 是APTS在中国的应用与发展.本文在对比了世界各国智能公共交通系统研究现状的基础上, 提出了适合中国国情的智能公共交通系统的构成和实施框架,并给出了关键理论与技术问题的 解决方案。     

A constraint programming model with time uncertainty for cooperative flight departures

The lack of a proper integration of strategic Air Traffic Management decision support tools with tactical Air Traffic Control interventions usually generates a negative impact on the Reference Business Trajectory adherence, and in consequence affects the potential of the Trajectory-Based Operations framework. In this paper, a new mechanism relaying on Reference Business Trajectories as a source of data to reduce the amount of Air Traffic Controller interventions at the tactical level while preserving Air Traffic Flow Management planned operations is presented. Artificial Intelligence can enable Constraint Programming as it is a powerful paradigm for solving complex, combinatorial search problems. The proposed methodology takes advantage of Constraint Programming and fosters adherence of Airspace User’s trajectory preferences by identifying tight interdependencies between trajectories and introducing a new mechanism to improve the aircraft separation at concurrence events considering time uncertainty. The underlying philosophy is to capitalize present degrees of freedom between layered Air Traffic Management planning tools, when sequencing departures at the airports by considering the benefits of small time stamp changes in the assigned Calculated Take-Off Time departures and to enhance Trajectory-Based Operations concepts.     

CASE STORAGE BASED ON RELATIONAL DATABASE

IntroductionCase- Based Reasoning ( CBR) ,as a relativelynew methodology,has attracted wide concern ofAI researchers since1 980 's.The number of suc-cessful applications of CBR is growing rapidly,especially in the fields of architecture and indus-try,e.g. ARCHI- II[1] for the architecture designof courthouse and MIDAS[2 ] for the conceptualdesign of aircraft.The currently prevailing CBD systems mostlytreat cases as instances of some predeterminedand static case template.Such an appro…     

INTERLAYER MATERIALS DESIGN OF HPSN/K-500 JOINT

IntroductionBecause of the differences of crystal chemistryproperties,physical properties and surface con-ditions between ceramic and metal,the metallur-gical compatibility is very poor.It is essential tochoose suitable interlayer materials to achievethe high strengh ceramic/ metal joint.Interlayermaterials must be suitable to the propertieswhich( 1 ) would obviously reduce residual stress injoint,which may occur during cooling period be-cause of the differnet thermal expansion coeffi-cient be…