摘要：本综合实验利用电化学方法和吸收光谱法测试有机分子的能带结构。首先,利用电化学工作站测定二茂铁和三(8-羟基喹啉)铝在不同测试体系中的循环伏安曲线。其次,利用紫外−可见分光光度计测定三(8-羟基喹啉)铝的紫外−可见吸收光谱。根据循环伏安曲线和紫外−可见吸收光谱计算得到有机分子的HOMO值、LUMO值和能隙值。其中,电化学方法测得三(8-羟基喹啉)铝的能隙为3.07 eV,吸收光谱法测得的能隙为2.80 eV,两种方法测得的能隙在误差允许的范围内。将传统的测试方法应用于研究有机分子的能带结构的实验教学内容,不仅可以巩固学生的基础知识,而且可以加深学生对电化学氧化还原过程和紫外−可见光吸收过程的认识。

摘要：College English listening teaching faces great opportunities and challenges under the web-based environment. This paper concerns how to utilize the web and multimedia resources in an effective way and explores the autonomous learning potential of the students; designs the process assessment teaching model, and discusses the feasibility, regulations and what need to be concerned in practice. The aim of the process assessment teaching model is to promote the quality of college English listening teaching, improving students＇ listening competence and their autonomous learning ability.