数学“学习单元”教学法的实践与研究

一、问题的提出 随着我国经济的高速发展,对职业教育提出了更新、更高的要求.国务院出台文件提出“文化素质+职业技能”的终身教育理念,浙江省为了顺应国际教育“融合性”发展趋势,提出以“教学项目”为载体创新“做中学”教学方法,中职教育改革如火如荼,任重道远.     

中职数学教学中存在的若干问题及对策

对中职学生而言,数学是一门基础学科.学好数学,不仅能提高基本素质,促进专业课的学习,对职业技能和数学核心素养的提高也有很大帮助,并且奠定了学生的综合从业素质基础. 一、当前中职数学教学存在的问题 当前,中职学校的数学教学和教学质量不尽如人意,大部分中职学生数学基础较差.据笔者统计,约20％的学生数学基础较好,约50％的学生存在明显的知识缺陷和不足,约30％的学生缺乏学习中职数学的基础知识和基本能力.     

Bandgap evolution of Mg3N2 under pressure: Experimental and theoretical studies

Wide bandgap semiconductors are crucially significant for optoelectronic and thermoelectric device applications. Metal nitride is a class of semiconductor material with great potential. Under high pressure, the bandgap of magnesium nitride was predicted to grow. Raman spectra, ultra-violet-visible (UV-Vis) absorption spectra, and first-principles calculations were employed in this study to analyze the bandgap evolution of Mg₃N₂. The widening of the bandgap has been first detected experimentally, with the gap increasing from 2.05 eV at 3 GPa to 2.88 eV at 47 GPa. According to the calculation results, the enhanced covalent component is responsible for the bandgap widening.