浅谈珠心算教师队伍建设

有一支高质量的珠心算教师队伍,是做好珠心算教学推广与普及,保证珠心算教学质量的关键所在。为此,我校积极探索实践,不断开拓思路,优化珠心算教师培养机制,提炼出了珠心算教师队伍建设的五方面策略。     

80.5 MeV/u碳离子诱发铜靶的放射性剩余产物测量

高能重带电粒子能直接穿透靶原子核外电子层,与原子核发生直接碰撞,发生散裂反应,产生一系列具有放射性的剩余产物核.重带电粒子诱发靶材放射性剩余核与辐射防护和人员安全有着密切联系,当前,大部分剩余核产额主要依靠蒙特卡罗粒子输运程序进行模拟计算,其准确程度亟需通过实验测量进行准确评估.本文利用能量为80.5 MeV/u的(12)^C⁶⁺粒子对薄铜靶开展了辐照实验与伽玛射线测量,结合伽玛谱学分析方法,得出了辐照产生的18种放射性剩余产物的初始活度和产生截面值,并与PHITS模拟结果进行对比.结果表明,PHITS模拟程序对放射性剩余核种类的估计具有较高可靠性,在其绝对产额方面,与实验测量仍具有较大偏差.     

Second-order random wave solutions for interfacial internal waves in N-layer density-stratified fluid

This paper studies the random internal wave equations describing the density interface displacements and the velocity potentials of N-layer stratified fluid contained between two rigid walls at the top and bottom. The density interface displacements and the velocity potentials were solved to the second-order by an expansion approach used by Longuet-Higgins （1963） and Dean （1979） in the study of random surface waves and by Song （2004） in the study of second- order random wave solutions for internal waves in a two-layer fluid. The obtained results indicate that the first-order solutions are a linear superposition of many wave components with different amplitudes, wave numbers and frequencies, and that the amplitudes of first-order wave components with the same wave numbers and frequencies between the adjacent density interfaces are modulated by each other. They also show that the second-order solutions consist of two parts： the first one is the first-order solutions, and the second one is the solutions of the second-order asymptotic equations, which describe the second-order nonlinear modification and the second-order wave-wave interactions not only among the wave components on same density interfaces but also among the wave components between the adjacent density interfaces. Both the first-order and second-order solutions depend on the density and depth of each layer. It is also deduced that the results of the present work include those derived by Song （2004） for second-order random wave solutions for internal waves in a two-layer fluid as a particular case.     

浅谈如何发挥珠心算在数学教学中的作用

儿童是智力发展的关键时期，著名心理学家布鲁姆的研究表明，儿童八岁就获得80％的智力。智力一般指观察力、注意力、记忆力、想象力和思维力。教学实践和科学测试已经证明，珠心算有利于开发右脑、启动右脑的形象思维，促进左右脑的协调发展以及智力因素和非智力因素的全面提高。因此，珠心算教育明显具有开发儿童智力潜能的作用已是不争的事实，但如何在充分发挥珠心算启智功能的同时，注重发挥其教育功能，尤其是充分发挥珠心算在数学教学中的作用，是摆在广大珠心算教育工作者面前值得思考的问题。     

以“三功”训练为突破口，深入开发学生的智力

珠算、珠心算的计算过程要靠眼看数、脑运算、手拨珠、手写数来完成，从而要求儿童必须具有过硬的“眼功”、“脑功”、“手功”才能使计算迅速而准确。在几年来的实践中，我发现珠心算对儿童的智力有着很大的启智功能，以下是对培养儿童智力方面的几点认识。