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在高校转型发展的背景下,本论文从课程教学现状出发,探讨了微分几何的教学方法,强调课程教学中讲述微分几何发展历史的重要性;又从培养学生的直觉力和鉴赏力方面出发,给出了有效的学习方法,强调主动学习方法和比较学习方法的意义. 相似文献
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本文研究了还原LiNbO_3的折射率损伤(光损伤)的磁化率和光电导性间的关系和外加电场的效应。光电流量与折射指数变化成正比。光电流和光损伤随外加电场而变化,取决于固有的内电场。引起光损伤的固有电场值已从光电流外推和折射率变化与外加电场曲线之关系作出估计。其结果是,用加外电场的办法能容易地控制还原LiNbO_3的光损伤。 相似文献
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The temperature-dependent coefficients of self-diffusion for liquid metals are simulated by molecular dynamics meth ods based on the embedded-atom-method (EAM) potential function. The simulated results show that a good inverse linear relation exists between the natural logarithm of self-diffusion coefficients and temperature, though the results in the litera ture vary somewhat, due to the employment of different potential functions. The estimated activation energy of liquid metals obtained by fitting the Arrhenius formula is close to the experimental data. The temperature-dependent shear-viscosities obtained from the Stokes-Einstein relation in conjunction with the results of molecular dynamics simulation are generally consistent with other values in the literature. 相似文献