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In this paper, the crystallization behaviors and transport properties are investigated for a-Ge/Bi bilayers annealed at different temperatures. For 200nm/100nm bilayers, it is found that the orientations of Bi in the bilayers annealed at 200℃ and 340℃ are preferred, as well as the original one. But they are random when the bilayers are annealed at tem-peratures between 240℃ and 300℃. For 200nm/50nm bilayers, the orientation of Bi are always preferred. Corresponding to the orientations mentioned above, the minimum on the R(300K)-Ta curve appears only in the case of 200nm/100 nm bilayers. 相似文献
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我从事珠算课教学工作已经30多年了,对于如何搞好珠算课教学谈谈我的几点体会。 一、上好绪论课,使学生明确学习珠算课的目的 重视思想教育,是提高珠算课教学质量的前提。教与学是对立统一的,老师要教得好,学生也要学得好,要重视听课,才能收到好的教学效果。对珠算课,首先要解决学生的思想认识问题。有的学生不了解为什么在科学技术飞跃发展、电子计算机已经普及的今天,还要学珠算,因此,我在一开始讲绪论课就着重阐明珠算的地位和作用,并举大量生 相似文献