利用2×2纤锥表面等离子共振传感液体折射率

介绍了2×2纤锥等离子共振的工作原理,并用其对液体折射率进行传感。制作的表面等离子共振传感器用于检测甘油水溶液的折射率时,观测到被测液体折射率在(1.448,1.4515)区间变化时,等离子共振波长在(1450,1593)nm区间移动,两者间呈线性对应关系。系统的传感分辨率为2.448×10-5 RIU。     

历史坐标中的美国研究型大学四种评议会制度

美国研究型大学评议会模式存在四种类型,即欧陆模式、功能模式、冲突模式和影响模式。从历史分析的角度对美国研究型大学评议会制度进行全面考察,并通过案例大学的分析来了解其现实状况。     

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.     

GLABROUS INFLORESCENCE STEMS regulates trichome branching by genetically interacting with SIM in Arabidopsis

Arabidopsis trichomes are large branched single cells that protrude from the epidermis. The first morphological indication of trichome development is an increase in nuclear content resulting from an initial cycle of endoreduplication. Our previous study has shown that the C2H2 zinc finger protein GLABROUS INFLORESCENCE STEMS (GIS) is required for trichome initiation in the inflorescence organ and for trichome branching in response to gibberellic acid signaling, although GIS gene does not play a direct role in regulating trichome cell division. Here, we describe a novel role of GIS, controlling trichome cell division indirectly by interacting genetically with a key endoreduplication regulator SIAMESE (SIM). Our molecular and genetic studies have shown that GIS might indireclty control cell division and trichome branching by acting downstream of SIM. A loss of function mutation of SIM signficantly reduced the expression of GIS. Futhermore, the overexpression of GIS rescued the trichome cluster cell phenotypes of sim mutant. The gain or loss of function of GIS had no significant effect on the expression of SIM. These results suggest that GIS may play an indirect role in regulating trichome cell division by genetically interacting with SIM.     

音变规则对民族地区英语教学的启示

基于语义严格对应理论,结合英语系统中五条常见的语音对应关系进行举例分析,认为民族地区英语教学可以利用音变对应关系及其规律进行。     

Floyd算法分析与演示系统设计

路径分析是网络分析最基本的问题,其核心是对最短路径的求解,其求解算法的优劣决定相关软件的性能,通过对F1oyd算法分析,比较了各种算法的时间复杂度,并使用Java语言设计演示程序说明了Floyd算法的实现机制。     

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.