Dynamic Responses Analysis of a Building Structure Subjected to Ground Shock from a Tunnel Explosion     

TIAN Li  LI Zhongxian  HAO Hong 《天津大学学报(英文版)》2006,12(Z1)

Dynamic responses of a multi-storey building without or with a sliding base-isolation device for ground shock induced by an in-tunnel explosion are numerically analyzed. The effect of an adjacent tunnel in between the building and the explosion tunnel, which affects ground shock propagation , is considered in the analysis. Different modeling methods, such as the eight-node equal-parametric finite element and mass-lumped system, are used to establish the coupling model consisting of the two adjacent tunnels, the surrounding soil medium with the Lysmer viscous boundary condition, and the multi-storey building with or without the sliding base-isolation device. In numerical calculations , a continuous friction model, which is different from the traditional Coulomb friction model, is adopted to improve the computational efficiency and reduce the accumulated errors. Some example analyses are subsequently performed to study the response characteristics of the building and the sliding base-isolation device to ground shock. The effect of the adjacent tunnel in between the building and the explosion tunnel on the ground shock wave propagation is also investigated. The final conclusions based on the numerical results will provide some guidance in engineering practice.  相似文献   

Promoting NQT linguistic awareness of dialogic teaching practices: a dialogic model of professional development     

Carole Bignell 《Literacy》2019,53(3):150-159

This study offers an insight into the experiences of three newly qualified English primary teachers and their pupils as they sought to develop dialogic teaching in lessons. It draws upon a range of literature from the field of classroom talk, with a particular focus on the work of Robin Alexander to underpin teacher/researcher professional discussion and analysis of periodic video recordings of talk in these classrooms. Supplemented by teacher interviews, the research examines the extent to which a dialogic approach to teacher professional development might facilitate teacher self‐evaluation as a means of developing a more dialogic classroom. In doing so, it seeks to exemplify key talk moves (dialogic bids) that these teachers used to open up dialogic spaces in lessons. The research concludes that raising teacher awareness of such talk moves through professional discussion and reflection upon teaching can provide teachers with a metacognitive resource for talking about and furthering dialogic teaching practices.  相似文献   

对校园交际中英汉语码转换现象的功能分析     

范晓迪 《商丘职业技术学院学报》2007,6(4):67-69

语码转换指在同一次对话或交谈中,说话者使用两种或两种以上的语言变体的现象。它是语言接触的一种常见现象。大学校园中教师和学生会根据实际情况进行语码转换。尝试对大学校园交际中英汉语码转换的功能作出分析,指出英汉语码转换是对语言现实、社会规约以及心理动机的顺应。  相似文献   

基于物联网可交互超市智能购物车设计     

龙正江  刘丽华  林力  李可涵  郜浩  曲宇凯 《辽宁科技学院学报》2019,21(3):17-18

物联网作为信息科学技术的第三次革命,自从2009年“感知中国”以来,受到了全社会极大的关注。文章主要介绍了采用语音识别、RFID射频识别、定位、数据处理等技术开发设计的智能交互购物车,该系统可以很大程度上解决人们在超市的不便,最大化实现了超市的智能化。  相似文献   

What is reciprocal understanding in virtual interaction?     

Arja?BymanEmail author  Sanna?J?rvel?  P?ivi?H?kkinen 《Instructional Science》2005,33(2):121-136

The aim of this study is to investigate what is reciprocal understanding in virtual web-based interaction and what does it consist of. The context of this study was an international web-based pre-service teacher education (N=116) course. The study is based on an idea of shared cognition and reciprocal understanding, in particular. It is assumed that reciprocity is an essential component not only of social interaction, but also of successful virtual interaction. Since many kinds of virtual interaction, such as e-learning, web-based courses, and virtual universities are rapidly getting more common in education, there is a need to analyse the issue of reciprocal understanding in web-based learning in order to develop more profound pedagogical models. The results widely show that during this particular web-based course there was reciprocal discussion between the participants. Participants had mutual negotiations and they discussed about issues from a variety of different viewpoints. Seven different ideas were found for the mechanisms of reciprocal understanding. It is concluded that this information is useful for developing a new pedagogical model for web-based learning and enhancing the quality of virtual interaction.  相似文献   

Improvisation: An analytic tool for examining teacher–child interactions in the early childhood classroom     

Carrie L. Lobman   《Early childhood research quarterly》2006,21(4):455-470

This article explores the use of improvisation (improv) as a lens for viewing and describing teacher–child interactions. The author describes the relationship between the principles of improv and the characteristics of responsive teaching, and how improv can be used as a lens for seeing relational activity. The author hypothesizes that improv would provide a valuable tool for understanding and describing what is happening between teachers and children. An in-depth case study was conducted of an experienced early childhood teacher in a play-based classroom. Analysis was done using both the codes derived from the teacher–child interaction literature and improv theory. Improv analysis offered a nuanced picture of what early childhood teachers are doing in practice. The findings revealed that using improv provides a lens for seeing teacher–child interactions as an ensemble activity and what the teacher is doing in terms of its usefulness to the activity. While this study focused on a single teacher in one classroom, the findings demonstrate the potential of an improv lens for developing and deepening our understanding of early childhood teaching.  相似文献   

重建课堂秩序   总被引：7，自引：0，他引：7  

李德显 《教育研究》2004,(6)

课堂秩序是教师在课堂教学过程中所面临的基本问题。由于师生对课堂情境的定义存在一定的冲突,会导致课堂秩序处于不和谐的状态。课堂秩序的形成经过制度化、合理化两个阶段。课堂秩序的重建依赖于教师教学观念、课堂控制行为方式的转变,依赖于教师交往技能的提高、教学策略的改革以及师生之间有效的“磋商”。  相似文献   

一种基于实时手写字符和方程自动语法分析的数学方程编辑系统     

卢达  浦炜 《常熟理工学院学报》2001,15(4):84-89

本文介绍的数学方程编辑器是基于手写字符识别和方程自动语法分析，连同用户接口组成一个具有自动分析说明的简单纠错编辑系统，虽然在公式识别之前有些修正还必须依赖于使用者，但与基于特殊方程描述语言的编辑系统相比，使用较为方便。  相似文献   

“女性文学”存在的合理性及其定义     

程玉 《郧阳师范高等专科学校学报》2004,24(2):40-44

“女性文学”存在的合理性一直是一个备受争议的话题 ,而且由于它的定义的杂乱 ,某种程度上也妨碍了它的被确认。通过女性在社会生活中和文学文本中的被压抑状态的描述 ,可以确证“女性文学”存在的合理性。同时也略微针对现存的几种关于“女性文学”的定义提出一些看法  相似文献   

初论对话教学的本质内涵   总被引：4，自引：0，他引：4  

张英楠 《山东教育学院学报》2005,20(3):51-52

对话教学作为现代教育的一种实践形态，是对传统教学秩序的重新建构，体现了一种全新的教学理念。而对话究其本质，它是人类生命存在的基本方式，是教育双方在平等互动基础上的积极建构，它以人的发展为着眼点，进行的是生命的建构。较之以往的教学，对话教学更符合人的规律，更贴近人性，因而在当今的教育实践中表现出了独特的价值。  相似文献