数学知识在化学解题中的应用

分别从代数和几何两个角度给出了数学知识在化学解题中的应用,使纯粹的数学概念和理论融会到实际的化学计算中,以致数理合一,收到事半功倍之功效。     

LISTEN TO THE SILENCE: THE LEFT-BEHIND PHENOMENON AS SEEN THROUGH CLASSROOM VIDEOS AND TEACHERS’ REFLECTIONS

This study uses classroom videotapes to examine the phenomenon of students who are left behind during whole-class teaching. Zooming in via these videos enabled us to analyze these classroom situations by means of a compact, multi-perspective set of theories – van Hiele theory, conceptualization, and visual perception. The analysis provided a picture of the classroom interaction in which the sound of silence of those students who might not share understanding during the class discourse is ignored. Based on a sample of Taiwanese junior high school geometry classes, the study demonstrated how investigating situations of silence uncovered the possibility of teachers’ unawareness of student difficulties or their unsuccessful efforts to cope with them. Teachers’ post-lesson interviews and questionnaires shed additional light on the perspective of left-behind students. Implications of this method for pre- and in-service teachers’ programs are briefly discussed, and some recommendations for change are proposed. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

共价键理论的系统学习

共价键理论是化学学习中物质结构的重要内容,是价键理论的重要组成部分。非化学专业的学生由于多方面的原因,目前对于共价键理论的学习都只侧重于结论,对于其中的原理比较模糊。尤其是电子轨道方向性的来源,电子波函数最大重叠原理与成键的关系,σ,π成键的描述和杂化轨道的轨道处理问题与分子构型的关系。从原子分子物理的角度对共价键理论系统的学习可以对这些问题进行解释。     

《解析几何》中所体现的素质教育目标

数学教育在本质上是素质教育,在21世纪的教育中,数学教育在人才培养方面发挥着重要作用。然而在实际教学中,如何从教材出发制定素质教育目标,教材中都体现了哪些素质教育的内容是教育工作者必须认识到的。只有认识到这些问题才能将素质教育贯彻好,数学教育才能真正承担起人才培养的责任。     

机械模拟原理在学校选址模型求解中的运用

本文运用机械模拟原理及其几何作图方法解决了在学校选址模型中最短距离的求解问题，并进行了简单应用。     

新课程理念下的高师几何教学

从《普通高中数学课程标准》的基本理念出发，对高师几何课程的设置、课程的教学、教学的方式与手段进行探讨．     

A Learning Model That Stimulates Geometric Thinking Through Use of PCLogo and Geometer's Sketchpad

Summary

PCLogo and Geometer's Sketchpad are powerful tools that may be used by mathematics teachers who want to integrate technology with geometry instruction in the elementary classroom. The purpose of this study was to examine the usefulness of PCLogo and Geometer's Sketchpad to stimulate thinking about geometric concepts in elementary age children. We used a collective case study design that included four cases, two girls (ages 8 and 10) and two boys (ages 10 and 11). All participants were trained to use PCLogo and Geometer's Sketchpad to construct geometric shapes and measure the attributes of the shapes. After the training, participants used these technologies as tools to stimulate thinking about geometric concepts. As a result of our observations of children's performances as they reasoned about geometric concepts, we developed a learning model for teaching children about geometry.     

谈谈如何学好高等代数

高等代数是高等院校里数学专业的一门专业基础课程,该课程概念多,抽象,且逻辑性强。不少学生感觉基本概念难以理解,习题难做,基本方法难以掌握。针对这些困难,提出学好该课程的系统的学习方法与建议。     

论立体几何中体积求法

文章探讨了用公式法、等体积变换法、割补法、极值法、分析特殊截面等方法求立体几何中几何体的体积     

预测分子空间构型的一种简便方法

本文研究的预测分子空间构型的方法是以杂化轨道理论为基础 ,根据电子配对原理 ,简明、准确地预测ABn 型分子的空间构型。