期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
以学为本 顺学而导——小学数学“五学三动”教学范式 被引量:1
1
作者 顾亚龙 《小学教学研究》 2020年第1期4-6,共3页
小学数学"五学三动"教学范式基于学生的前置性"研学",课上展开"研学、对学、群学、展学、延学",旨在探索小学数学教学"从‘教为中心’向‘学为中心’转变"的实践路径;探索如何"以学为本,... 小学数学"五学三动"教学范式基于学生的前置性"研学",课上展开"研学、对学、群学、展学、延学",旨在探索小学数学教学"从‘教为中心’向‘学为中心’转变"的实践路径;探索如何"以学为本,顺学而导",让学生从被动学习到能动学习、从个体学习到协同学习、从表层学习到深度学习,促进学习者"在学习""真学习"的有效载体和操作范式,以培育学生的学习素养。 展开更多
关键词 一课 五学三动 为本
下载PDF
“五学三动”教学模式下的课例研究与实践
2
作者 应蒙蒙 《现代教学》 2019年第17期51-52,共2页
本文首先介绍了“五学三动”课堂教学模式的相关背景和相关知识,然后以《三位数被一位数除》一课为例,对如何进行“高观念设计,板块化实施”进行了探索和实践。
关键词 五学三动 题组模块
下载PDF
Time-Dependent Zinc Desorption in Some Calcareous Soils of Iran 被引量:1
3
作者 M.BARANIMOTLAGH M.GHOLAMI 《Pedosphere》 SCIE CAS CSCD 2013年第2期185-193,共9页
Desorption of zinc (Zn) from soil is an important factor governing Zn concentration in the soil solution and Zn availability to plants. Batch experiments were performed to study the kinetics of Zn desorption by diet... Desorption of zinc (Zn) from soil is an important factor governing Zn concentration in the soil solution and Zn availability to plants. Batch experiments were performed to study the kinetics of Zn desorption by diethylenetriaminepentaacetic acid (DTPA) from 15 calcareous soil samples taken from Golestan Province in northern Iran. Soils were equilibrated with 0.005 mol L-1 DTPA solutions for 0.25 to 192 h. The results showed that the extraction process consisted of rapid extraction in the first 2 h followed by much slower extraction for the remainder of the experiment. Desorption kinetic data was fitted to pseudo-first-order kinetic model. The experimental data were found to deviate from the straight line of the pseudo-first-order plots after 2 h. The model of two first-order reactions was fitted to the kinetic data and allowed to distinguish two pools for Zn: a labile fraction (Q1), quickly extracted with a rate constant kl, and a slowly labile fraction (Q2), more slowly extracted with a rate constant k2. The applicability of pseudo-second-order model in describing the kinetic data of Zn desorntion was also evaluated. 展开更多
关键词 diethylenetriaminepentmucetic acid kinetic models labile fraction zinc availability
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部