封闭方腔自然对流传热的场协同分析     

云和明  ;张华伟  ;邱卫国 《山东教育学院学报》2014,(4):106-112

文章采用有限元方法数值研究了封闭方腔自然对流传热问题,并基于场协同理论分析了速度场与温度梯度场的协同关系,进一步深层次分析了协同角场同速度场、温度场、温度梯度场之间的协同关系,展示了不同瑞利数下方腔自然对流速度场和温度梯度的协同效果,着重探讨了各物理场对封闭方腔协同角的影响规律,同时表明以协同角为评价指标,可有助于改善局部的传热效果,从而深层次理解强化自然对流传热的机理,为实际工程的传热强化提供了理论依据。  相似文献   

A machine learning approach to investigating the effects of mathematics dispositions on mathematical literacy     

Florence Gabriel  Jason Signolet  Martin Westwell 《International Journal of Research & Method in Education》2018,41(3):306-327

Mathematics competency is fast becoming an essential requirement in ever greater parts of day-to-day work and life. Thus, creating strategies for improving mathematics learning in students is a major goal of education research. However, doing so requires an ability to look at many aspects of mathematics learning, such as demographics and psychological dispositions, in an integrated way as part of the same system. Large-scale assessments such as the Programme for International Student Assessment (PISA) provide an accessible and large volume of coherent data, and this gives researchers the opportunity to employ data-driven approaches to gain an overview of the system. For these reasons, we have used machine learning to explore the relationships between psychological dispositions and mathematical literacy in Australian 15-year-olds using the PISA 2012 data set. Our results from this strongly data-driven approach re-affirm the primacy of mathematics self-efficacy and highlight novel complex interactions between mathematics self-efficacy, mathematics anxiety and socio-economic status. In this paper, we demonstrate how education researchers can usefully employ data-driven modelling techniques to find complex non-linear relationships and novel interactions in a multidimensional data set.  相似文献   

基于神经网络的房价预测与分析     

汪静  罗维平  陈永恒 《襄阳职业技术学院学报》2021,(2):112-115,140

随着人们物质生活水平的提升,房价也随之不断增长,房地产行业作为社会经济的支柱产业,对社会经济有着巨大贡献.针对房价上涨趋势问题提出了一种基于神经网络的房价预测模型.首先,通过爬虫获取相关房屋交易信息,再采集数据进行预处理,最终将数据传入所建模型进行模型训练,得到最终房价预测模型.实验结果表明通过预测模型可对房价进行精确...  相似文献