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前概念对物理概念教学的影响及教学策略 总被引:1,自引:0,他引:1
物理概念是“整个物理学理论的基石”,是“物理思维的细胞”.学生对物理概念的掌握程度会直接影响到其物理学的学习质量,物理概念教学的重要性是不言而喻的.但是,物理概念教学却并非易事,一般来讲,它要受到诸多因素的影响和制约,其中,学生头脑中前概念的存在就是一个很重要的影 相似文献
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First-Principles Calculations of Elastic Properties of LaNi4.75Sn0.25 Alloys under Pressure 下载免费PDF全文
The equilibrium lattice constants, bulk modulus, shear modulus, elastic constants and Debye temperature of LaNi4.75 Sn0.25 under pressure are calculated using the full-potential linearized augmented plane wave (FP-LAPW) method as well as the quasi-harmonic Debye model. The results at zero pressure are in excellent agreement with the experimental data. The Sn atom is found to occupy the equivalent 3g site (0.5a, 0.75b, 0.5c) in the quadruple cell. The Debye temperature of LaNi4.75Sn0.25 is lower than that of LaNi5. The dependences of bulk modulus on finite temperature and on finite pressure are also investigated. The results show that the bulk modulus B increases monotonously as pressure increases. 相似文献
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