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针对传统专业课教学存在教学方法落后、过程管理松懈,更有甚者,通过降低试卷难度、变相泄题等不正当手段使学生通过课程考核等问题,中国计量大学光学原理教师进行了底线管理教学探索与改革.通过及格考试、基础训练系统、能力提升教学、评价模式改革等手段,在不明显增加学习负担的前提下,使学生能及时解决课程学习中的基础性问题,充分了解通过课程考核的基本方法和努力方向,明确能力提升和获取教师帮助的途径,真正达到课程基本要求.实践表明,基于底线管理的教学改革在提高学生学习效率,减轻教师重复性工作,提升课程教学质量等方面取得了良好的效果. 相似文献
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A novel Tm^3+/Yb^3+ triply-doped glass ceramics containing BaF2 nano-crystals are successfully prepared. Fluoride nanocrystals BaF2 are successfully precipitated in glass matrix, which is affirmed by the X-ray diffraction results. The intense blue (476 nm), green (543 nm), and red (656 nm) emissions of the glass ceramics are simultaneously observed at room temperature under 980-am excitation, and the emission luminescence intensity increases significantly compared with the precursor glass, which is attributed to the low phonon energy of fluoride nanocrystals when rare-earth ions are incorporated into the precipitated BaF2 nanocrystals. Under 980-nm excitation at 400 mW, the international commission on illumination (CIE) chromaticity coordinate (X = 0.278, Y = 0.358) of the tridoped oxyfluoride glass ceramics' upconversion emissions is close to the standard white-light illumination (X = 0.333, Y= 0.333). The results indicate that Tm^3+/Yb^3+ triply doped glass ceramics can act as suitable materials for potential three-dimensional displays applications. 相似文献
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