网络统一授时系统在气象行业中的应用研究     

熊雄  胡伟  刘小钢 《科技广场》2010,(3):138-140

气象业务具有时效性强和时间一致性要求高的特点。气象资料收集时间的准确性对于各类气象科研和气象数据的业务应用显得尤为重要。随着气象业务现代化的快速发展,气象业务对全网时间同步的需求也越来越迫切。本文简要介绍了NTP技术原理,分析了气象部门对时间同步的具体需求和网络统一授时系统的体系结构,并借助时间同步技术在江西气象业务中成功的应用实例,探讨了网络统一授时系统在气象行业具有一定的推广应用价值。  相似文献   

Time–frequency recurrent transformer with diversity constraint for dense video captioning     

《Information processing & management》2023,60(2):103204

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Introducing the DYNAMICS framework of moment-to-moment development in achievement motivation     

《Learning and Instruction》2022

This article introduces a new theoretical and psychometric framework describing moment-to-moment development and inter-dependencies of achievement motivation in terms of the situated expectancy-value theory, by introducing dynamical systems concepts into this line of research. As a first empirical example of a study using this framework, we examined whether task values, costs, and success expectancies measured in a learning situation (time point t) predicted themselves and each other at the next situation (t + 1; 27 min later) within a weekly university lecture.Situational task values, expectancies, and costs were assessed using the experience sampling method in 155 university teacher training students during weekly lectures for one semester, with three surveys during each weekly lesson. Data were analyzed with multilevel cross-lagged structural equation models.There were significant auto-regressions from one learning situation to the next in success expectancies and effort costs, but not in intrinsic, utility, or attainment value nor emotional or opportunity costs. There were no significant cross-lagged effects from one situation to the next in any of the measured situated expectancy-value components.As a framework to integrate dynamical systems concepts into the research on situated learning motivation, we expect the proposed DYNAMICS framework to have a substantial impact on further theory development.  相似文献   

面向高阶思维培养的博物馆课程话语分析实证研究     

聂昱  邓丽敏  王楠  郝瑜沛 《电化教育研究》2022,(2)

近期,国务院相关部门出台了一系列政策,鼓励利用博物馆资源开展系列活动课程,博物馆的青少年教育功能逐渐受到重视。文章以北京科学中心的10门课程作为研究对象,采用内容分析和滞后序列分析等方法探究课堂上师生对话的特点和学生高阶思维的发展情况。研究发现:博物馆课堂上存在四种典型的对话结构,且博物馆课堂中存在大量的实践环节,衍生了多样的教育内容和教育形式;教师使用合适的引发和反馈话语,如追问、解释等,能最大限度地促进学生高阶思维发展;学生在博物馆课程中展现出高阶思维的比例约为44%,但展现的高阶思维类型不均衡。针对研究结论,提出充分利用博物馆中的教育资源以提高课堂协同知识建构水平,优化话语策略以促进学生高阶思维发展,加强制度设计以促进博物馆教育高质量发展等建议。  相似文献