Special Issue

Teacher education, the process of becoming a teacher and aiding others to become teachers, is in part a journey of imaginative development. Students come to imagine teaching, and themselves as teachers, in new ways. This essay reports on an attempt to use ideas about imagination in teaching and learning as the central theme of the first semester of a one‐year teacher education program in British Columbia, Canada. Following a discussion of the theoretical and practical challenges encountered, several possible means of extending this approach are proposed. It is argued that a program thus infused by imagination may be more likely to lead to authentic professional transformation of the kind often posited as a goal of teacher education.     

Introduction to the Special Issue

Expository text is often neglected in the elementary school curriculum even though most of the reading that children do in school is of that type. Most of the research that demonstrates the importance of text structure in reading comprehension and the benefits that accrue from instruction in text structure deals with children at or above the 4th grade. This research literature, reviewed briefly, provides the basis for the work that is described in this article, which involves younger children. First, a study is presented that demonstrates that children are sensitive to text structure, and therefore would benefit from instruction, as early as 2nd grade. Second, a new instructional program is described that focuses intensively on one specific expository structure, compare and contrast. Finally, the results of a study that evaluates the effects of the program are described.     

前言

压电和声波理论与器件设计密切相关,特别是压电谐振器的工作原理就是材料中弹性波的压电效应。在信息技术高度发达的今天,压电谐振器作为最基本和最常见的敏感元件,在所有的通讯技术、电子电路、传感器和基于换能器的智能结构中都有着广泛的应用,也激发了固体力学界对这一现象展开大量的理论研究工作。可以说,压电现象作为桥梁将固体力学这一传统学科和新兴的信息技术、生物技术和近年来迅速发展的微机电(MEMS)技术等领域有机地联系了起来,无论从科学研究和工程应用的角度,都赋予了固体力学新的机会和生命力,也为研究和技术人员提供了具有…