高中数学研究性学习的思考

新的课程计划中设置"研究性学习",旨在改变学生的学习方式和教师的教学观念,强调学习方式与教学方式的科学化与多样化,强调学生学习过程中的探究与过程、情感与体验、交流与合作等;目前高中实施研究性学习主要有三种模式:(1)课程模式;(2)学科课程中"研究性学习课题"模式;(3)学科教学中的渗透模式.     

榆科种子油脂肪酸成分与榆科分类

 22 kinds of seed oils were extracted from 8 genera of the family Ulmaceae in China The seed oils were examined for their characteristics and fatty acid compositions by gas liquid chromatography.  The fatty acid compositions of these oils were found to fall into two classes. Some genera (such as  Ulmus,  Zelkova)  contain  mainly lower saturated acids, in which the chief acid is capric acid 10:0, while the genera (such as Celtis, Pteroceltis, Aphananthe, Trema, Gironniera) contain mainly unsaturat- ed acids, in which the chief acid is linoleic acid  18:2.  Hemiptelea  davidii  (Hance) Planch contain however either certain amount of short-chain saturated acids or higher unsaturated acids, it appears a intermediate genus between the two classes.  According to the component acids we support that the Ulmaceae be split into two subfamilies. The genera arrangement based on the component acids corresponds basically with the view based on mophological characters and flavonoids found in leaves of Ulmaceae, but there are some discrepancies in certain genera, for example, the Aphananthe should beplaced in Celtoid instead of Ulmoid by the present study.     

浅析运用气相色谱分析法进行变压器故障判断

针对我厂除灰除尘变压器油色异常变深采用气相色谱分析法进行分析判断及处理。     

信息技术的运用对中学数学教学的影响

信息技术全面渗透到数学教学中,改变了数学教育观念、课堂教学模式、学生的数学学习方式,对数学教学也有不容忽视的负面影响     

透过课堂教学中的“非预设生成”分析学生的探究能力

新课程的核心理念是“一切为了每一个学生的发展”。“发展”是一个动态的生成过程。一方面是教师的课前设计。即“预设”：另一方面是实际教学过程中的发生、发展与变化,即“生成”。如何在课堂中找到预设与生成的平衡,让我们的课堂教学在生成中更加精彩。下面谈谈自己的一点体会。