浅预习 重思辨——小学生思辨能力培养的探索

培养小学生良好的预习习惯初衷是好的,但是在实践过程中存在一些忧患,如预习的条件不均衡、预习变相预知答案、教师不断加深课堂教学难度等等,特别是对答案的依赖性,严重影响学生思辨能力的培养。思辨能力的培养是一个综合的过程,从小学阶段预习程度的把控方面,探讨预习对于小学生思辨能力的影响。     

浅部缩径缺陷对单桩竖向承载特性的影响

为了探究浅部缩径缺陷对单桩竖向极限承载力的影响规律,设计了包含1根完整桩和9根带有浅部缩径的缺陷桩在内的10组室内模型试验,并进行相应的有限元数值模拟,获得了10根桩的桩顶荷载-沉降曲线。结果表明:在单桩浅部含有缩径长度不大于完整桩桩长的10%且缩径处桩径不小于完整桩桩径的80%时,或者单桩含有缩径长度不大于完整桩桩长的2.5%时,浅部缩径对单桩竖向极限承载力基本无影响;当单桩含有的缩径长度为完整桩桩长的2.5%～10%,且缩径处桩径小于完整桩桩径的80%时,单桩竖向极限承载力降低约20%;在未达到单桩竖向极限承载力之前,所有单桩桩顶荷载-沉降曲线呈线性变化;达到单桩竖向极限承载力之后,含有较大程度浅部缩径缺陷桩的曲线斜率较完整桩偏大。     

话说钓边、钓浅

所谓钓边,我想就是离岸近距离垂钓。什么季节钓边？什么水域该钓边？钓边能钓到什么鱼？这是一个很复杂的问题。钓边观漂清楚,受风浪和水流的影响不大,又能钓到鱼,何乐而不为呢？     

Research on the operating characteristics of parallel 4-DOF electric platform with 4TPS-PS structure

The 4TPS-PS parallel platform designed for a stabilization and automatic tracking system is a novel lower-mobility parallel mechanism. In the first part of this paper, the structure of the platform is described and the kinematics model is built. The workspace of the platform is defined as the full reachable rotation workspace when the Z coordinate dimension of the upper plate varies continuously. A fast searching method of the full reachable workspace is presented, after which the inverse kinematics of the platform is deduced. The forward and inverse solutions of the speed and force of the platform are deduced. According to the characteristic of the 4TPS-PS platform’s structure, a fast searching algorithm of the maximum generalized speed and maximum generalized force output by the upper plate is put forward based on the forward and inverse solutions of the platform’s speed and force. The 4TPS-PS platform prototype built by the State Key Laboratory of Fluid Power Transmission and Control of China is taken as the research subject. The full reachable rotation workspace of the prototype is computed out and analyzed. The curves of maximum generalized speed and maximum generalized force of the prototype are computed out and plotted. Finally, the com- puting and analyzing results of the operating characteristics are confirmed through the experiment.     

初中物理摩擦力教学浅探

摩擦力是初中物理的重要概念,在苏科版教材的编排上,第一节是滑动摩擦力的概念,然后探讨影响滑动摩擦力的因素,第二节是改变摩擦力的方法。另外,介绍静摩擦、生活中的摩擦现象等。结合学生对摩擦力知识的学习情况,文章重点探讨课堂导入、概念建立、影响因素、教学启示等内容。     

当代大学生阅读倾向的实证研究——以东南大学为例

以东南大学为例,通过对2007～2008年本科生、研究生借阅中文图书的记录数据进行整理挖掘,分析东南大学学生的阅读倾向,并揭示目前我国大学生人文素养存在的实用、浅薄、短视等问题,进而从图书馆的角度对当代大学生人文素养的培养进行了思考.     

人性假设与教育意谓

人性假设是依一定的价值取向对人性的现实表现有选择的抽象,是人的实践活动的基本理论前提。教育“为人”,不管是其理论建构还是实践活动,必然建立在某种人性假设的基础上。以先验的“伦理人”和“理性人”为取向的预成论人性假设容易导致片面的教育;教育“成人”,关注人性发展的可能性与丰富性,必须从生成论人性假设出发,引导人的人性自觉和精神自由,促进人性的生成与丰富。     

孟子的廉洁自律思想探究

孟子的廉洁自律思想建构于其伦理道德观念之中,故而其主色调尽显高尚。他要求统治者只能适度享乐、与民同乐,尽量约束权力、清心寡欲;为官之际应尽心尽责、守仁守诚;并培养高尚的道德以自愿施行仁政;最终成为廉洁自律之圣人。其思想堪称儒家廉洁自律之理想派,它激励着后世执政者清廉奉公、严于律己、培育道德、施仁成圣。