多彩的糖——旋光追踪蔗糖水解反应

蔗糖溶液原本是无色透明的溶液,在偏振片的帮助下,可以使蔗糖溶液呈现出多彩的颜色。本文利用偏振片这一特性,观测在不同浓度下蔗糖溶液分光能力的差异,追踪蔗糖溶液在酸性条件下的水解过程,并介绍了实验现象背后的科学道理。

海藻酸盐微胶囊及纳米Fe3O4的可控制备及应用的研究——介绍一个综合探究实验

介绍一个综合探究实验——制备海藻酸钙微胶囊和纳米Fe3O4,研究其吸附水中有机物和金属离子的效果。本实验与前沿接轨,能充分激发学生的学习兴趣,变被动学习为主动,有利于提升学生的综合探究能力。

Preliminary Study on the Construction of University Emergency Response System

Along with the deepening of reform and opening up, the impact of diversified culture, changing educational environment, emergencies occur ~equently in university, which seriously affected the normal teaching and management order in university. This article analyzesthe concept, characteristics, causes and linkage system of university emergencies.