办好开放大学的随想

信息化具有明显的优势,它是远程教育发展的技术支撑。找准定位,是充分发挥远程教育自身特长,凸显自身的价值和地位的需要,是远教发展的生命线及价值核心。大教育体系具有明显特色优势,它是远程教育的组织基础、生机与活力的源泉。解放思想、更新理念是远教改革创新的精神动力,要深入探寻改革创新、凝聚力量之路。     

电子信息工程专业实验教学的探讨

根据教育部电子信息类学科专业发展规划,结合学校电子信息工程专业建设现状,分析该专业学生的实验教学,实验室运作、规划、建设等,提出自己的看法和见解。     

Prompting secondary students’ use of criteria,feedback specificity and feedback levels during an investigative task

This study investigates the effects of prompting on secondary students’ written peer feedback in chemistry investigation reports. In particular, we examined students’ feedback features in relation to the use of criteria, feedback specificity, and feedback levels. A quasi-experimental pre-test post-test design was adopted. Reviewers in the prompted condition were provided with question prompts that asked them to pose written feedback to their peers on what they did or did not do well and suggestions for improvement, while reviewers in the unprompted condition gave written peer feedback without prompts. The findings showed that prompted peer feedback has a significant effect on the number of comments related to Knowledge of errors, Suggestions for improvement and Process level feedback. This study supports the view that prompting peer feedback in the use of criteria, feedback specificity and feedback levels opens up opportunity for reviewers to engage more meaningfully with peer feedback in report writing tasks.     

Using a Dialogical Approach to Examine Peer Feedback During Chemistry Investigative Task Discussion

Peer feedback is an inherent feature of classroom collaborative learning. Students invariably turn to their peers for feedback when carrying out an investigative task, and this feedback is usually implicit, unstructured and may positively or negatively influence students’ learning when they work on a task. This study explored the characteristics of verbal peer feedback during a collaborative investigative chemistry task involving New Zealand Year 13 students. During the planning stage of the students’ investigation, the discussions of five pairs of students were recorded and then transcribed. Analysis of transcribed verbal data focused on interactions that involved peer feedback along two dimensions, interactive/non-interactive and dialogic/authoritative (Mortimer and Scott, 2003). The findings indicated that although students adopted a predominantly interactive/authoritative communicative approach, with peer feedback as confirmation or evaluation, they are also capable of a more interactive/dialogic exchange, characterised by elaborative peer feedback. We discuss how this dialogic perspective on peer feedback provides an alternative approach to the analysis and study of student–student interactions during science investigations. The findings should be interpreted in light of the limitations in terms of sample size, grouping and specificity of the coding scheme. Implications for teacher practice are discussed in relation to facilitating peer feedback discourse in the science classroom.     

办公楼宇的综合布线网络设计原则及实施

本文首先介绍了综合布线系统的设计原则,然后根据这五个设计原则进行具体实施,既要保证其实用性,又要有一定的超前性,适宜未来的发展.     

Micromixer based on viscoelastic flow instability at low Reynolds number

We exploited the viscoelasticity of biocompatible dilute polymeric solutions, namely, dilute poly(ethylene oxide) solutions, to significantly enhance mixing in microfluidic devices at a very small Reynolds number, i.e., Re≈0.023, but large Peclet and elasticity numbers. With an abrupt contraction microgeometry (8:1 contraction ratio), two different dilute poly(ethylene oxide) solutions were successfully mixed with a short flow length at a relatively fast mixing time of <10 μs. Microparticle image velocimetry was employed in our investigations to characterize the flow fields. The increase in velocity fluctuation with an increase in flow rate and Deborah number indicates the increase in viscoelastic flow instability. Mixing efficiency was characterized by fluorescent concentration measurements. Our results showed that enhanced mixing can be achieved through viscoelastic flow instability under situations where molecular-diffusion and inertia effects are negligible. This approach bypasses the laminar flow limitation, usually associated with a low Reynolds number, which is not conducive to mixing.     

基于宏观测评与微观诊断的图书馆网站满意测评研究

随着图书馆的数字化、网络化发展,图书馆网站信息服务质量满意测评变得极为重要.本文提出了针对图书馆网站满意的宏观测评方案与微观诊断方案,即将已构建的图书馆网站用户满意测评模型-ICSI-L模型用于宏观测评分析,以帮助各图书馆网站寻找用户满意的改进方向,然后各图书馆网站可根据微观诊断方案结合自己的特点再对微观影响因素进行分析.最后,基于微观诊断方案本文还提供了相应的微观诊断满意测评软件,从而为满意测评推广提供了技术平台.     

机械工程测试技术与机械设备故障诊断课程CAI教学系统初探

文章所述的ＣＡＩ教学系统是基于ＷＩＮＤＯＥＳ９５／９８平台研制开发的,完全采用可视化编程语言编制,具有良好的人机界面,它把机械工程测试与机械设备邦联诊断的基本理论、方式手段在微机这一现代化辅助教学工具上加以展示,具有形象、准确、逼真、操作方便灵活等诸多特征。     

我国四大数据库网站IA评价研究(一)

基于IA的基本内容构建一套IA评价指标体系,并以此对我国4大数据库网站的IA进行应用性考察与分析评价。     

面向21世纪的高校学报运作模式

高校学报改革应根据各校学报的学术影响和学术地位,采取不同的运作模式,提出对于科技实力较强,科研成果较多的院校,其学报可以采用一刊多辑或单学科模式,而对于那些普通高校的学报,则可采用多校合刊模式或采用科研详报或科技简报模式。