Mathematics teachers’ beliefs about a new reform in high school geometry in Iran

The geometry textbooks of the new system of secondary education in Iran differed dramatically from the old ones considering the aims, the visions, the content, the approach, and the educational purposes. Four hundred eighty mathematics teachers participated in a nationwide professional development program conducted by the author to facilitate the implementation of the new changes. Based on this program, a research study was designed to investigate the teachers’ beliefs about a new reform in high school geometry as a result of the professional development program. The data of the study were collected through teachers’ reflective writings, project works, group discussions, reflective questionnaires, and oral communications. The purpose of this paper is to draw upon this study and to document mathematics teachers’ beliefs about new changes.     

CAD-VR geometry and meta data synchronization for design review applications

INTRODUCTION The first phases of the product life cycle are almost completely digitalized nowadays. Single parts or complete product models are modeled with 3D CAD solutions. Assembling single parts to digital mockups (DMUs) is important for checking the de- pendencies between the parts and detecting conflicts. Due to their complexity, such data is managed in specialized Product Data Management (PDM) sys- tems. They gained an increasing importance in many industries during the last d…     

关于《微分几何》的几个问题

梅向明先生所编《微分几何》教材被越来越多的高校数学系所采用，但尚有美中不足之处．文中给出了有关渐缩线方程，相对曲率计算公式的更简便的推导；讨论了如何才能很快地做出切线，法面，密切平面，副法线和从切平面方程的方法；还对有的习题进行了推广．     

分子中C-C键离解能的密度泛函研究(英文)

利用密度泛函理论(B3LYP,B3PW91,B3P86),使用6-31G*和6-311G*基组计算了18个分子中的C-C键离解能。通过比较计算值和实验结果,发现B3P86/6-311G*方法能给出与实验相符合的结果,而B3LYP和B3PW91方法则不能给出满意的C-C键离解能。另外,研究发现C-C键的键长与其键离解能呈线性关系,利用此关系预言了7个分子的C-C键离解能,得到的结果与实验结果符合较好。     

高职院校“画法几何与阴影透视”课程项目教学法研究

“画法几何与阴影透视”是高职院校建筑设计专业学生专业知识和技能的启蒙课程。长期以来,该课程在教学过程中存在重理论轻实践、缺乏“近工作状态”体验的现象,严重影响了学习效果和实用性。该文对该课程项目教学法的优点、特点、案例设置原则、项目教学方法、具体案例进行了分析和研究,利用项目教学让学生在“近工作状态”中学习,增强高职教育的高效性、实用性,以培养具有工匠精神的实用型人才为最终目标[1]。     

例说向量在解析几何中的应用

向量体现着数与形的结合，运用向量知识解决几何中的问题是思维的发散性和灵活性的具体表现。     

基于仿射变换的双波段红外图像配准算法研究

图像配准是图像融合技术中的首要环节,只有经过配准的图像才能够进行融合。虽然双波段红外探测器探测的是同一场景,但是由于光学系统的构造产生了两幅图像,而两幅图像之间却存在了几何位置上的差异,所以在本文中提出一种配准方法。通过点检测方法获取图像的特征点,然后再选取其中两组较为明显的特征点组,再根据仿射变换关系式,确定其中的模型参数,并且对图像进行配准。