指向深度学习的物理课堂提问策略探析——以“磁体与磁场”的教学为例

指向深度学习的课堂提问的目的不仅在于收获知识本身,更在于引导学生主动建构个性化认知结构,提升思维品质,培养关键能力.文章以“磁体与磁场”的教学为例,通过系统化的问题结构,引导学生建构知识网络;通过丰富的问题形式,关注个体差异,拓展思维层阶;通过层递性的问题设计,引导学生挖掘思维的深度;通过有效把握和把控问答的时机,激发思维的活力;通过创造自主提问的理想环境,培养思维的批判性.     

Magnetic phase transition and magnetocaloric effect in Mn_(1-x)Zn_xCoGe alloys

The magnetic phase transition and magnetocaloric effect are studied in a series of Mn1-xZnxCoGe(x = 0.01, 0.02,0.04, and 0.08) alloys. By introducing a small quantity of Zn element, the structural transformation temperature of the MnCoGe alloy is greatly reduced and a first-order magnetostructural transition is observed. Further increasing the Zn concentration results in a second-order ferromagnetic transition. Large room-temperature magnetocaloric effects with small magnetic hysteresis are obtained in alloys with x = 0.01 and 0.02, which suggests their potential application in magnetic refrigeration.