小学数学教学情境课堂的创设方法的探讨

新课程改革实施以来,小学数学教学情境改革成为专家和学者讨论研究的热点话题。受到传统教育思想的束缚和影响,小学数学教学课堂学习气氛沉闷,老师和学生之间缺乏互动性,学生习惯于被动地接受老师传授的知识,缺乏创新意识和主动学习能力。为了改变小学数学教学的现状,本文主要从新课程改革下的小学数学教学情境创设的意义展开讨论,对我国小学数学教学情境课堂创设的具体方法展开探讨。

Characterization and Tribological Performance of Titanium Nitrides in Situ Grown on Ti6Al4V Alloy by Glow Discharge Plasma Nitriding

Titanium(Ti)nitrides were in situ grown on Ti6Al4V alloy(TA)using a glow discharge plasma nitriding(GDPN).The morphology,chemical composition,phase and mechanical property of the obtained nitrided TA were analyzed using a scanning electron microscope(SEM),energy dispersive spectroscope(EDS),X-ray diffraction(XRD),and nanoindentation tester,respectively.The tribological performances of un-nitrided and nitrided TAs were evaluated using a ball-on-plate wear tester,and the wear mechanism was also discussed in detail.The results show that the nitrided layer with the compound and diffusion layers is formed on the nitrided TA,which is composed of δ-TiN and a-Ti phases.The nanohardness and elastic modulus of nitrided TA are 6.05 and 143.13 GPa,respectively,higher than those of un-nitrided TA.The friction reduction and anti-wear performances of nitrided TA are better than those of un-nitrided TA,and the wear mechanism is primary abrasive wear,accompanying with adhesive wear,which is attributed to the formation of Ti nitrides with the high nanohardness and elastic modulus.

基于生活素材挖掘的小学数学教学资源开发探讨

小学数学是小学课程中不可或缺的部分,加之逻辑性较强,所以开发学生的数学学习能力尤为重要,数学学习能力的开发需要良好数学基础与学习积极性的支持,然而在实际教学中学生的学习积极性并不高,主要原因在于小学数学教学资源没有得到充分开发,可见挖掘生活素材合理开发小学数学教学资源势在必行。因此,主要就基于生活素材挖掘的小学数学教学资源开发进行了分析与探讨。