Use of concept cartoons as an assessment tool in physics education   总被引：1，自引：0，他引：1  

Sebnem Kandil Ingec 《美中教育评论》2008,5(11):47-54

There are numerous studies in literature related to the use of cartoons in physics, chemistry and mathematics education. However the studies on the use of cartoons as an alternative assessment tool are highly limited. This study was concerned with the use of cartoons as an alternative assessment method. There were five cartoons prepared related to impulse, momentum, impulse-momentum equation, conservation of momentum and vector property of momentum. The study revealed that physics pre-service teachers failed to emphasize the fact that momentum is vector quantity. Also the fact that only 15% of the participants scored a full point for the caricature related to the conservation of momentum is an issue which should seriously be considered. This shows us that there are some problems in the application of the conservation of momentum to everyday examples.  相似文献   

基于改进BP神经算法的农产品价格预测模型的构建与实现     

魏明桦  郑金贵 《唐山师范学院学报》2014,(2):66-68

为了提高农产品价格预测精度,提出一种改进的 BP 神经网络模型。先通过定性分析得到影响农产品价格波动的因子,然后采用MIV方法选择强影响力的因子作为神经网络输入节点。并采用改进的算法进行学习,寻找最优的BP网络结构。利用改进后的模型,实现了农产品价格的高精度仿真。  相似文献   

牵连运动定理研究     

贺景文 《茂名学院学报》1999,(4)

该文结合动力学普遍定理与合成运动定理导出了牵连运动定理,从而为求解系统动力学问题提供了一种简单而实用的方法。  相似文献