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961.
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) 相似文献
962.
复合图书馆管理模式及其构成要素 总被引:1,自引:0,他引:1
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。 相似文献
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Jon Porter 《英语辅导》2017,(9)
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. 相似文献
965.
[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。 相似文献
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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. 相似文献
969.
Jon Baggaley 《Distance Education》2015,36(3):437-447
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. 相似文献
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