教育是社会发展的重要基石,亦被视为推动社会文明进步的关键因素。授人以鱼不如授人以渔是教育的核心目标。可当成绩和排名至上成为教育的主流思想时,学生取得高分的背后往往伴随着“理解”的缺失,教育的初心也被抛之脑后。师生们被成...教育是社会发展的重要基石,亦被视为推动社会文明进步的关键因素。授人以鱼不如授人以渔是教育的核心目标。可当成绩和排名至上成为教育的主流思想时,学生取得高分的背后往往伴随着“理解”的缺失,教育的初心也被抛之脑后。师生们被成绩单所束缚,选择以高分为目标而忽视对知识的深刻理解。不论是填鸭式教学还是题海战术,都从侧面反映了在教育教学中“理解”被轻视、被低估。不重视“理解”是当前教育的一大弊端。尽管人们普遍承认“理解”的重要性,却鲜有人真正将其从教育的背景中解放出来。本文将从“理解”这一概念出发,探讨其内涵和意义,论述从学会“理解”到应用“理解”的过程,呼吁教师关注“为理解而教”的重要性。Education is a crucial cornerstone for societal development and is seen as a key factor in advancing social progress and civilization. The principle of teaching someone to fish rather than giving them a fish encapsulates the core objective of education. However, when the dominant ideology in education prioritizes grades and rankings above all else, the high scores achieved by students often come at the expense of deep understanding, and the original intention of education is forgotten. Both teachers and students become constrained by report cards, choosing to focus on achieving high scores while neglecting profound comprehension of knowledge. Whether through rote memorization or endless exercises, these approaches reveal a systemic undervaluation of “understanding” in education. This neglect is a significant drawback of the current educational system. Despite widespread acknowledgment of the importance of understanding, few genuinely integrate it into the forefront of education. This paper delves into the concept and significance of “understanding,” discussing the process from achieving understanding to applying it, and calls on educators to recognize the importan展开更多
为提升钛酸铋钠(NBT)基无铅陶瓷电容材料的储能性能,以A位掺杂方式向0.65[Na_(0.5)Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)中引入MgO,并采用固相烧结法制备了不同摩尔含量(x=0.01~0.06)的0.65[(Na1-x,Mgx)0.5Bi_(0.5)TiO_(3)]-0....为提升钛酸铋钠(NBT)基无铅陶瓷电容材料的储能性能,以A位掺杂方式向0.65[Na_(0.5)Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)中引入MgO,并采用固相烧结法制备了不同摩尔含量(x=0.01~0.06)的0.65[(Na1-x,Mgx)0.5Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)(NBT-SBT)陶瓷样品。通过SEM观察和XRD表征,发现随着Mg^(2+)含量的增加,NBT-SBT陶瓷的晶粒尺寸呈先减小后增大的变化,在Mg^(2+)掺入量(x)为0.025时,陶瓷晶粒尺寸最小。介电温谱和电滞回线测试表明该陶瓷为典型的铁电弛豫体,具有较高的介电常数(εr)和电极化强度(Pmax)。在100 k V/cm电场下,(Na0.94,Mg0.06)BT-SBT的可释放能量密度Wrec高达1.65 J/cm^(3),储能效率η为75%,综合性能优于同类NBT基陶瓷样品。结果表明,MgO掺杂的(Na1-x,Mgx)BT-SBT陶瓷具有优异的储能密度和效率,可为电子电力设备等领域的高功率储能电容器件的研究提供参考。展开更多
文摘教育是社会发展的重要基石,亦被视为推动社会文明进步的关键因素。授人以鱼不如授人以渔是教育的核心目标。可当成绩和排名至上成为教育的主流思想时,学生取得高分的背后往往伴随着“理解”的缺失,教育的初心也被抛之脑后。师生们被成绩单所束缚,选择以高分为目标而忽视对知识的深刻理解。不论是填鸭式教学还是题海战术,都从侧面反映了在教育教学中“理解”被轻视、被低估。不重视“理解”是当前教育的一大弊端。尽管人们普遍承认“理解”的重要性,却鲜有人真正将其从教育的背景中解放出来。本文将从“理解”这一概念出发,探讨其内涵和意义,论述从学会“理解”到应用“理解”的过程,呼吁教师关注“为理解而教”的重要性。Education is a crucial cornerstone for societal development and is seen as a key factor in advancing social progress and civilization. The principle of teaching someone to fish rather than giving them a fish encapsulates the core objective of education. However, when the dominant ideology in education prioritizes grades and rankings above all else, the high scores achieved by students often come at the expense of deep understanding, and the original intention of education is forgotten. Both teachers and students become constrained by report cards, choosing to focus on achieving high scores while neglecting profound comprehension of knowledge. Whether through rote memorization or endless exercises, these approaches reveal a systemic undervaluation of “understanding” in education. This neglect is a significant drawback of the current educational system. Despite widespread acknowledgment of the importance of understanding, few genuinely integrate it into the forefront of education. This paper delves into the concept and significance of “understanding,” discussing the process from achieving understanding to applying it, and calls on educators to recognize the importan
文摘为提升钛酸铋钠(NBT)基无铅陶瓷电容材料的储能性能,以A位掺杂方式向0.65[Na_(0.5)Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)中引入MgO,并采用固相烧结法制备了不同摩尔含量(x=0.01~0.06)的0.65[(Na1-x,Mgx)0.5Bi_(0.5)TiO_(3)]-0.35Sr_(0.7)Bi_(0.2)TiO_(3)(NBT-SBT)陶瓷样品。通过SEM观察和XRD表征,发现随着Mg^(2+)含量的增加,NBT-SBT陶瓷的晶粒尺寸呈先减小后增大的变化,在Mg^(2+)掺入量(x)为0.025时,陶瓷晶粒尺寸最小。介电温谱和电滞回线测试表明该陶瓷为典型的铁电弛豫体,具有较高的介电常数(εr)和电极化强度(Pmax)。在100 k V/cm电场下,(Na0.94,Mg0.06)BT-SBT的可释放能量密度Wrec高达1.65 J/cm^(3),储能效率η为75%,综合性能优于同类NBT基陶瓷样品。结果表明,MgO掺杂的(Na1-x,Mgx)BT-SBT陶瓷具有优异的储能密度和效率,可为电子电力设备等领域的高功率储能电容器件的研究提供参考。
