理科大学生学习行为的调查分析     

刘贵忠 《德州学院学报》2009,25(6):106-110

基于现代教育学和行为学理论,设计调查问卷,并进行测试修订采用分层随机抽样方法,进行大样本问卷调查,分析数据,总结出大学生物理课程学习过程中男女学生行为的差别,以利于改进和提高学习效率。  相似文献   

示波器测量脉冲信号的扩展思路     

沈正传  胡慧之 《泰州职业技术学院学报》2010,10(3):1-2,5

随着传输速度的提升,脉冲信号的上升时间越来越短,上升沿覆盖了更宽的频谱范围,需要更短的测量时间。文章为快沿脉冲信号测量提供了解决方案。  相似文献   

Teaching empathic concern and altruism in the smartphone age     

Brian N. Fry 《Journal of moral education》2018,47(1):1-16

Numerous studies show empathic concern promotes altruistic motivation and prosocial behavior. Here, we discuss empathic concern, its relation to altruistic motivation, and how empathic concern is invoked in experimental studies. We do this with an eye toward applying laboratory techniques in the classroom, and everyday life, to foster empathic concern and altruistic responding. This goes beyond teaching about empathic concern to setting up conditions that help people experience this psychological state, and its benefits, firsthand. Smartphone-based ecological momentary interventions (EMIs) can help us do this by raising self- and other-awareness, and by promoting empathic states and practices in daily life. While smartphones often pull us away from direct personal interaction, we explore ways of using these devices to redirect our attention to those around us. We end by suggesting that these ways of helping people regularly experience and act upon empathic concern in daily life might help nurture a compassionate disposition.  相似文献   

基于神经网络重要抽样法的结构可靠度评估     

陈铁冰 《深圳职业技术学院学报》2009,8(3):38-41

文章提出基于神经网络重要抽样法的结构可靠度评估方法,该方法通过训练神经网络,建立随机变量与结构响应之间的非线性映射关系,模拟结构极限状态方程,采用优化算法计算设计点．在重要抽样法中利用训练好的神经网络代替有限元求解器进行数值计算．结果表明,所训练的神经网络能够有效地模拟真实的结构极限状态方程,结构失效概率计算结果具有很高的精度,调用有限元分析的次数显著减少,有效地提高了计算效率．  相似文献   

多抽样率信号处理理论及其应用研究     

周翠  王路 《教育技术导刊》2007,(21)

多抽样率信号处理是建立在单抽样率信号处理基础上的一类信号处理。在传输信号时,由于语音、图象、视频信号的抽样中心频率相差很大,所以需要以多种抽样频率来对信号采样来满足各种传输类型的需要。探讨了改变抽样频率的两种方式-抽取和插值的基本原理,着重探讨了整数倍抽取和内插在数字语音系统中的应用。  相似文献   

电力系统采样频率自适应预测算法   总被引：1，自引：0，他引：1  

朱安福  苏涛  李云飞 《渭南师范学院学报》2005,20(2):30-32

针对电力系统中频率变化导致的数据采集和测量误差,文章提出一种对电力系统进行交流采样的一种自适应频率预测算法,为采用DSP技术准确估计交流信号的采样频率提供了可行的计算方法。  相似文献   

Missing children in educational research: investigating school-based versus household-based assessments in India     

Melissa Rae Goodnight  Savitri Bobde 《比较教育学》2018,54(2):225-249

Including all children in large-scale educational studies is a pressing concern. Omitting certain types of children from studies can lead to skewed findings that promote inaccuracies about learning levels or educational quality. Increasingly, assessments are a method for investigating the quality of education systems, but national assessments are typically conducted in classrooms and may fail to accurately represent a country’s full range of children. Alternatively, households can be a site for testing or collecting data on children’s learning. Analysing the quantitative data from two studies in India that use both household-based and school-based methods alongside data from Government of India sources, the issues with child representation in school-based assessments are examined, and the benefits of household-based research as an alternative are explored.  相似文献   

顶空进样—毛细管柱气相色谱法分析啤酒的香味组分   总被引：1，自引：0，他引：1  

刘小玲  梁奇峰 《嘉应学院学报》2005,23(3):33-35

介绍了采用毛细管柱气相色谱法分析测定啤酒中的微量挥发性香味组分.以高纯N2(99.999%)作为载气,并结合自动顶空进样技术,对啤酒中的12种微量挥发性香味组分进行定性和定量分析.结果表明:变异系数除乙醛与辛酸乙酯外均小于5%,回收率均在90%以上.该法具有较好的重现性和准确度.  相似文献   

Generalized Sampling Series Approximation of Random Signals from Local Averages     

宋占杰何改云  叶培新杨德运 《天津大学学报(英文版)》2007,13(1):8-11

Signals are often of random character since theycannot bear any information if they are predictable forany timet,they are usually modelled as stationary ran-dom processes. Balakrishnan[1]and Lloyd[2]investiga-ted the Shannon sampling on stationary randomp…  相似文献   

信息技术教育的现状与展望   总被引：1，自引：1，他引：1  

王国钧  吴孝燕  邵斌 《湖州师范学院学报》2003,25(3):112-116

在对浙江省湖州、嘉兴两市部分中学的信息技术学科教学进行抽样调查的基础上，从课程设置、教材使用、教学设备、师资力量等方面分析了中学信息技术学科教学的现状，并利用统计数字揭示了该学科教学目前存在的问题，最后对该学科教学的发展前景作了进一步的探讨。  相似文献