多功能车刀几何角度测量仪的研制     

韩永杰  佟永祥 《中国现代教育装备》2011,(1):47-50

针对工科院校车刀几何角度测量实验中存在的问题,从教学目标出发分析了车刀几何角度测量仪应具有的目标功能,在此基础上研制了多功能车刀几何角度测量仪,并进行了实验验证。该测量仪具有参考坐标系的建立、车刀几何角度测量和车刀纵横方向进给等多种功能,便于学生对金属切削刀具知识的学习、理解和掌握。  相似文献   

关于射影几何教学的几点探讨     

李彩凤 《中国科技信息》2007,(6):226-227

射影几何是非度量形式的几何。较之于欧氏几何,不仅观点不同,而且概念极其抽象。因此,上好绪论课和理解透概念对于学生学好该门课程非常重要。本文拟就教学实践的具体做法,谈了作者的看法。  相似文献   

Tracking control of nonlinear automobile idle-speed time-delay system via differential geometry approach     

Ting-Li Chien  Ching-Yu Hsu 《Journal of The Franklin Institute》2005,342(7):760-775

This paper is concerned with the problem of global asymptotical tracking of single-input single-output (SISO) nonlinear time-delay control systems. Based on the input-output feedback linearization technique and Lyapunov method for nonlinear state feedback synthesis, a robust globally asymptotical output tracking controller design methodology for a broad class of nonlinear time-delay control systems is developed. The underlying theoretical approaches are the differential geometry approach and the composite Lyapunov approach. One utilizes the parameterized co-ordinate transformation to transform the original nonlinear system into singularly perturbed model and the composite Lyapunov approach is then applied for output tracking. For the view of practical application, the proposed control methodology has been successfully applied to the famous nonlinear automobile idle-speed control system.  相似文献   

几何学中的升维类比与发现     

杨在荣  屈红萍 《保山师专学报》2011,30(5):68-71

数学的发现与数学的论证是数学的两大重要内容,如果没有数学的发现则论证就成了无源之水,无本之木;如果没有论证,命题的真假就不得而知,则发现就失去了意义。阐述了几何学中的升维类比与发现,一是命题的发现,二是论证的思想方法的发现。  相似文献   

线性代数教学体系的改革与实践   总被引：1，自引：0，他引：1  

郑玉敏毕小山  黄锦斌 《教学研究(河北)》2001,24(1):64-65

根据线性代数课程在教学内容和教学方法上存在着滞后于社会对人才需要的矛盾，对线性代数与空间解析几何教学内容和教学方法的改革进行了探讨。  相似文献   

Problems, perseverance, and mathematical residue     

Jennifer S. Thom  Susan E.B. Pirie 《Educational Studies in Mathematics》2002,50(1):1-28

This paper reports on a qualitative study in which three third grade students were presented with a mathematical challenge related to the volume of a cuboid. The task required the construction of containers and the enumeration of the multi-link cubes¹ held by each of the containers. The study videotaped and investigated the students working as a group through potentially seven different problem solving categories, and how they dealt with the student-generated mathematical dilemmas that surfaced during their exploration of the original problem. The tapes were examined for the problem solving actions that the students demonstrated, and an analysis of the students' counting strategies and solutions explored the connection between the children's spatial structuring and their use of numerical operations in enumerating 3-D rectangular arrays of cubes. The notions of perseverance and control are considered as they emerge during autonomous problem solving and the mathematical residue that results from the developing understanding of volume is discussed.This revised version was published online in October 2005 with corrections to the Cover Date.  相似文献   

一类椭圆型方程组解的存在性     

刘越里  董芳芳 《环球赛鸽科技》2015,(17)

本文研究了一类依赖于正参数λ椭圆型方程组,利用变分方法得到方程组存在最小能量解且为正解。  相似文献   

在解析几何教学中引入数学实验课的理论探讨     

覃桂茳  卢振坤 《梧州学院学报》2015,(3)

建构主义学习理论强调认知来源于学生对认知活动的自主参与,数学实验正是认知学习中可以替代具体活动的新技术。数学实验课对解析几何传统教学方式是一种有益的补充,该文将探讨如何把数学实验融入解析几何教学之中。  相似文献   

关于解析几何课程教学反思     

赵云平 《佳木斯教育学院学报》2015,(1)

本文就高等师范院校数学教育各专业解析几何教学的措施、内容、方法和手段等将如何改革进行了思考,提出了自己的看法。  相似文献   

中印两国几何的构造性之比较     

燕学敏 《咸阳师范学院学报》2011,26(2):81-84

中国和印度同属东方数学体系,二者的几何学发展都具有构造性,这种构造性主要体现在两个方面,一是数学体系本身就具有构造性,二是几何内容具有构造性。综观中国几何的历史发展,发现中国几何的构造性体系主要依据两个基本的原理:出入相补原理和刘祖原理。而印度几何与我国几何有相类似的特点,几何体系也是基于三个基本的数学原理:面积拼补原理、勾股定理以及正弦表。基于此,中国几何和印度几何有可能缘于同一个起源。  相似文献