Student attitudes toward learning,level of pre-knowledge and instruction type in a computer-simulation: effects on flow experiences and perceived learning outcomes

Attitudes toward learning (ATL) have been shown to influence students’ learning outcomes. However, there is a lack of knowledge about the ways in which the interaction between ATL, the learning situation, and the level of students’ prior knowledge influence affective reactions and conceptual change. In this study, a simulation of acid-base titrations was examined to assess the impact of instruction format, level of prior knowledge and students’ ATL on university-level students, with respect to flow experiences (Csikszentmihalyi, 1990) and perceived conceptual change. Results show that the use of guiding instructions was correlated with a perceived conceptual change and high levels of “Challenge,” “Enjoyment,” and “Concentration,” but low sense of control during the exercise. Students who used the open instructions scored highly on the “Control flow” component, but their perceived learning score was lower than that for the students who used the guiding instructions. In neither case did students’ ATL or their pre-test results contribute strongly to students’ flow experiences or their perceived learning in the two different learning situations.     

基于IdeaVR的机床拆装虚拟仿真教学探索

机械类许多课程需要讲解机床结构,但传统机床拆装非常不方便,拆装时间比较长,且危险性比较大,难以复原,因此借助于虚拟现实,建立三维虚拟拆装实验环境,配合真实的机床拆装,实现虚实结合,对于教学有重要意义,可节约时间,提高教学效果,经过一段时间的测试,获得了授课老师与学生的好评。     

情景模拟教学法在“组织行为学”教学中的应用

从情景模拟教学的内涵出发,列举了在教学中实际设计的模拟环节,介绍了具体的实施步骤,分析了实施效果,发现了存在的问题并提出了相关建议。     

Surface treatment of 0Cr19Ni9 stainless steel SMAW joint by plasma melting

Micro-plasma arc surface melting of 0Cr19Ni9 shielded metal arc welding joint with a micro-plasma arc welder produced a thin surface melted layer with a refined microstructure. The surface treatment changed the anodic polarization behavior in 0.5 mol/L H2SO4 solution. The polarization tests showed that for the as-welded joint both the heat-affected zone and the weld metal decreased in resistance to corrosion compared with the as-Received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.     

《机电系统仿真》教学改革与实践

《机电系统仿真》是机械电子工程专业一门重要的专业课程,对学生掌握机电系统仿真方法、仿真思路以及结论分析等具有支撑性的作用。在实际教学过程中,存在教材与实际工程脱节、课时安排不合理以及学生积极性不高、主观能动性不足等问题。根据教学中存在的问题,结合教学实践,提出了合理的教学内容、教学方法、加强学生实践能力和创新能力的培养等教学改革措施,并且在教学实践中灵活应用,取得了较好的教学效果。     

水疗按摩喷头内部两相流流场的数值模拟

为详细了解水疗按摩喷头内的气液两相流流场,对喷头内部流场进行了数值模拟计算,并在数值模拟的基础上,分析喷头内流场的压力、速度、气相分布,找出原结构的不足。结果表明:进水管直角弯头处的压力和速度减小显示了管道方向的突然改变引起局部能量损失;根据数值模拟显示的负压区可指导设计进气管的最佳位置;气相分布显示,原进气管的非对称结构使气液混合不够均匀。将模拟计算结果与实验结果比较,证明数值模拟所用的计算模型是有效的,表明数值模拟可以用于喷头的结构设计指导,并为喷头的结构优化提供便捷的验证手段。     

4级m序列发生器数学模型的仿真分析

对m 序列的数学模型进行了研究,探讨了实现m 序列的生成过程,设计了4 级移位寄存器的仿真模型,并运用SystemView 软件对其进行了仿真分析.结果表明,所设计的仿真模型的电路是合理的,结果与理论分析相符.     

对等网络P2P网络蠕虫综述

随着互联网的迅猛发展,P2P技术在很大程度上颠覆了人们对互联网的传统观念,而成为在流量上占据统治地位的新型应用,极大地满足了用户的需求,与此同时P2P蠕虫也成为目前P2P应用面临的最严重的威胁之一。在P2P蠕虫的特点、分类、传播模型、检测及其防御机制等方面做了综述性的分析,并分析了一些典型仿真软件的优缺点,对开发起到了一定的指导作用。     

MEMS固态引信谐振器的系统级设计与仿真

多端口组件网络方法可以实现MEMS器件系统级的快速设计与仿真。本文利用该方法,在SABER仿真平台上搭建了MEMS固态引信谐振器的系统级行为模型,并进行了小信号频域仿真、时域仿真以及灵敏度仿真,其结果接近于有限元分析结果。表明采用多端口组件网络方法进行MEMS器件的设计,可以满足设计要求,保证精度,提高设计效率。     

单片机虚拟实验室的建立

单片机原理及接口技术这门课所涉及到的实验实践环节比较多,而且硬件投入比较大。在具体的课程设计和毕业实践中,如果因为方案有误而进行相应的设计,会浪费较多的时间和经费。文章以学校单片机课程的实验教学为背景,较为全面地阐述采用仿真实验的特点及优势。