Young’s modulus evolution during heating,re-sintering and cooling of partially sintered alumina ceramics

The Young modulus of partially and fully sintered alumina ceramics, obtained by firing to different temperatures (range 1200–1600°C), has been determined via impulse excitation, and the evolution of Young’s modulus of partially sintered alumina with temperature has been monitored from room temperature to 1600°C. As expected, the room-temperature Young modulus of the partially sintered materials is lower than all theoretical predictions. With increasing temperature Young’s modulus decreases, until the original firing temperature is exceeded and sintering (densification) continues, resulting in a steep Young’s modulus increase. During heating and cooling the temperature dependence obeys a master curve for alumina, unless the temperature of the original firing is excessively low.     

加强高校青年教师思想政治工作的几点思考

加强对高校青年教师的思想教育工作是目前我国高等教育领域中一项极为主要的工作。加强对高校青年教师的思想教育工作的途径和方法,一是党政领导干部要高度重视,率先垂范;二是牢牢把握理想信念教育这个核心;三是要把思想政治工作渗透于教师的教学、科研工作之中,把思想政治教育和良好的服务以及严格的管理工作相结合;四是把思想政治工作做为一项长期的工作来抓;五是要坚持层次性原则,选择多样化的形式和方法。     

EDI网上银行支付系统设计

结合基于WEB的EDI技术和采用SET协议的CA认证技术 ,提出了网上银行支付系统的设计方案 ,并着重研究了支付流程和所采取的安全策略。     

高校青年教师职业道德建设的社会机制探析

文章从当前高校青年教师职业道德的特殊性和现状出发,对其职业道德建设的主要社会机制及存在的问题进行了剖析,并且坚持教师职业道德的理想要求与高校青年教师个体全面发展相统一的原则,对新形势下适应高校青年教师职业道德建设的社会机制及其体系的建构进行了探讨.     

家用纺织品二次面料设计的魅力及开发研究

家用纺织品二次面料设计即家纺材质再设计,一改普通面料较为单一的风格,可以使设计师在现有的面料局限中找到更多的创意空间,体现了材质再设计所具有发挥想象力、提升综合搭配能力、开发创造潜能等魅力。文章探讨对材质再设计的表现方法,分析了开发研究实例。最后探讨了我国家用纺织品材质再设计面临的问题与解决的途径。     

Young drivers’ attitudes toward accompanied driving: A new multidimensional measure

Four studies were conducted in order to develop and validate a multidimensional instrument to assess attitudes toward accompanied driving among young drivers. Study 1 (n = 841) focused on developing the Attitudes Toward Accompanied Driving Scale (ATADS), a self-report scale based on five previously conceptualized domains of attitudes. Factor analysis revealed the five hypothesized factors: Tension, Relatedness, Disapproval, Avoidance, and Anxiety. In addition, significant associations were found between these factors and gender, age, and the assessment of reckless driving as risky. Study 2 (n = 651) adopted a developmental approach, comparing the attitudes of participants in various stages of licensure. Disapproval and Tension were found to be higher, and Relatedness lower, among participants who had not yet begun driving instruction than among those who were taking driving lessons or had already obtained a license. Study 3 (n = 160) revealed associations between the five ATADS factors and perceived driving costs and benefits. In Study 4 (n = 193), associations were found between these factors and driver's self-image, with a combination of ATADS factors, self-image, and gender contributing to the explained variance of two outcome variables: driving self-efficacy, and reported frequency of reckless driving. The discussion focuses on the validity and utility of the new measure of young drivers’ attitudes toward accompanied driving, stressing its practical implications for road safety.     

基于GSM网络的智能家居系统设计

本文介绍了一种基于GSM网络的智能家居系统。该系统采用无线通信模块,以微处理器为控制核心,进行家居安防和家居控制,实现了远程报警、远程遥控等功能。同时该系统具有性能可靠和成本低的优点,可广泛应用于现代住宅中。     

对中国计算机事业发展的若干思考

给出了１９９８年在上海交通大学举行的第７届全国青年计算机学术会议上青年计算机学者提出的一些当前中国计算机领域面临的问题以及对策。     

Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites

This paper presents the mechanical behavior of LaCoO₃ and La_0.8Ca_0.2CoO₃ ceramics under four-point bending in which the two cobaltites are subjected to a low stress of ∼8 MPa at temperatures ranging from room temperature to 1000 °C. Unexpected stiffening is observed in pure LaCoO₃ in the 700–900 °C temperature range, leading to a significant increase in the measured Young’s modulus, whereas La_0.8Ca_0.2CoO₃ exhibits softening from 100 °C to 1000 °C, as expected for most materials upon heating. Neutron diffraction, X-ray diffraction and micro-Raman spectroscopy are used to study the crystal structure of the two materials in the RT–1000 °C temperature range. Despite a detailed study, there is no conclusive evidence to explain the stiffening behavior observed in pure LaCoO₃ as opposed to the softening behavior in La_0.8Ca_0.2CoO₃ at high temperatures (above 500 °C).