Hydrogen permeation behavior in Fe3Al-based alloy

Ultra-high vacuum gaseous hydrogen permeation experiments on Fe₃Al-based alloy were performed in the temperature range of 330∼450°C with an upstream hydrogen pressure between 3. 38×10⁴ Pa and 7.28×10⁴ Pa. The results show that the hydrogen diffusivity and permeability in Fe₃Al-based alloy obey Arrhenius relationship in the experimental temperature range and the hydrogen permeation process is controlled by the lattice diffusion of hydrogen at relative high temperature. The activation energy of hydrogen diffusion in the Fe₃Al-based alloy was found to be 75 kJ/mol. Supported by the National Natural Science Foundation of China (59895157)     

复合图书馆管理模式及其构成要素

指出观念的更新、环境的变化、技术的广泛渗透是导致复合图书馆生存理念和管理模式变革的基础。分析复合图书馆各类管理模式,提出复合图书馆的多元集成管理模式及其构成要素,即以用户为中心,以资源为基础,以服务为导向,以技术为桥梁,以宏观组织与信息法规为指导。     

数字图书馆个性化信息服务的演变与发展

通过对MyLibrary、PIE、DWE、LOVE、MyGrid等系统的实证分析,阐述个性化信息服务从个性化信息定制与推送服务发展为各种超越MyLibrary系统的个性化信息服务形式,直至基于特定群体的个性化知识决策服务的演变与发展过程,分析个性化信息服务对数字图书馆发展模式与方向的影响,总结个性化信息服务的基本特征与发展趋势。     

Word Search Puzzle:Places

Instructions:Read the clues (information that helps you to find the answers) and find the words they describe.The words can go any way,but the letters are always next to each other.The first clue is done for you.     

我国图书馆新媒体移动服务的实践与探索——以中国科学院文献情报中心“中国科讯”为例

[目的/意义] 系统回溯国内图书馆新媒体移动服务研究的理论基础与实践案例，总结理论研究进展和实践应用中的共性特征与优势经验，剖析当前实践中存在的问题，并针对相关问题提出解决方案。[方法/过程] 以"中国科讯"为研究案例，总结其在服务路径、服务方式与服务能力方面的实践探索。[结果/结论] "中国科讯"有效解决了国内图书馆新媒体服务定位不明确、不清晰、不全面的三个问题。图书馆需要加快传统新媒体移动服务逐步向集成多种功能的新媒体移动服务转变。     

Roles of Teachers in Orchestrating Learning in Elementary Science Classrooms

This study delves into the different roles that elementary science teachers play in the classroom to orchestrate science learning opportunities for students. Examining the classroom practices of three elementary science teachers in Singapore, we found that teachers shuttle between four key roles in enabling student learning in science. Teachers can play the role of (1) dispenser of knowledge (giver), (2) mentor of learning (advisor), (3) monitor of students’ activities (police), and (4) partner in inquiry (colearner). These roles are dynamic, and while teachers show a preference for one of the four roles, factors such as the nature of the task, the types of students, as well as the availability of time and resources affect the role that teachers adopt. The roles that teachers play in the classroom have implications for the practice of science as inquiry in the classroom as well as the identities that teachers and students form in the science learning process.     

Flips and flops

This article examines the current interest of educators in flipped learning. Although this concept has developed in the online and distance education literature over two decades, numerous current writers are attributing it to an idea formed in 2007 by two K–12 teachers in Colorado, USA. The mechanisms that generate such myths are examined, with emphasis on the confusions, defensive strategies, and blogfuscations that cause them in web sites and blogs. In its treatment of the flipped learning topic, Wikipedia.org, often regarded as lacking in accuracy and credibility, has demonstrated that a solid reviewing process can reduce the effects of hype and ensure that an accurate record is maintained. It is recommended that academic journals should enlist the help of their reviewing panels in monitoring hype as it arises and correcting accounts of it on, for example, Wikipedia as a vital quality control measure.     

论教学策略的优化

教学策略是关乎教学质量、维系教育改革的重要课题。优化教学策略能激发学生的学习兴趣,提升教育价值。当前优化教学策略的方式主要有：放手式、讨论式、融情式、联动式和多元式等。要实现教学策略的优化,必须实行“一二三”保障模式,即：摆正一个关系———传统教学方法与教学策略优化的关系;加强二项修养———教师学习方法的积累,授课方式的琢磨;改革三种考评———期末考试,课堂考评,课后作业。