如何让物理“保鲜”?

伟大的科学家爱因斯坦说过:“兴趣是最好的老师.”这就是说一个人一旦对某事物有了浓厚的兴趣,就会主动去求知、去探索、去实践,并在求知、探索、实践中产生愉快的情绪和体验.在课程改革的今天,如何激发学生学习物理的兴趣,教师应从内容安排,教学方法等方面加以考虑,重视实验教学,抓好课堂教学,适当应用多媒体教学,充分调动学生的主动性和积极性,提高物理教学效率.     

烷基聚葡糖苷微乳液中脂肪酶催化的酯合成反应动力学

在烷基聚葡糖苷C10G1．54／正丁醇／环己烷／磷酸盐缓冲液体系形成的油包水微乳液中，研究了在较高底物浓度下，脂肪酶催化正己酸和正丁醇的酯合成反应动力学及其影响因素。结果表明，在正己酸的初始浓度CHA^0较小时，反应初速率V0随正己酸浓度增大而增大，但随正丁醇表观浓度增大而减小；在CHA^0较大时，反应初速率V0随正丁醇表观浓度增大而增大，但随正己酸浓度增大而减小．在正己酸和正丁醇摩尔浓度之比为3．0左右反应速率最大．这些实验结果与传统的米氏反应不符，为此，从界面膜的构成，尤其是两种底物在界面膜上的分布情况人手进行了探讨．考察了C10G1.54浓度、正丁醇浓度和两者总浓度等对反应初速率V0的影响．     

烷基聚葡糖苷C9.6G1.3/n-C4H9OH/n-C6H14/H2O微乳液体系的介电弛豫谱研究

The pseudotertiary phase diagram of the microemulsion system alkyl polyglucoside/n-butanol/n-hexane/water was plotted at （30.0±0.1） ℃. The dielectric measurements, including permittivity, conductivity, relaxation strength, characteristic relaxation time, etc,, were applied to investigate the microstructure of the system. Unique dielectric relaxations were observed over the frequency range of 5-10^7 Hz, taking place possibly through an interracial polarization mechanism. According to the results obtained from dielectric spectroscopy, the structures of the microemulsion O/W, BC and W/O were determined, and some dielectric and phase parameters were calculated.