人工智能为在线合作学习提供了一定的技术支持,学习者能够依托媒体进行在线交互与合作学习。目前已有多种在线合作交互行为分析模型,但在线合作中的交互涉及多个维度,这些交互的分类在概念界定上存在包含和交叉,且在交互维度中探究在线...人工智能为在线合作学习提供了一定的技术支持,学习者能够依托媒体进行在线交互与合作学习。目前已有多种在线合作交互行为分析模型,但在线合作中的交互涉及多个维度,这些交互的分类在概念界定上存在包含和交叉,且在交互维度中探究在线合作问题解决仍存在空白。为了更好地服务网络学习环境中的交互行为分析,为在线交互中的合作问题解决提供研究基础,研究以2010至2019年间Web of Science数据库核心合集收录的网络学习环境中交互行为研究为主题的论文为样本,运用CiteSpace软件绘制可视化分析图谱,并通过二次文献分析,对在线合作交互行为研究进行梳理。通过收集发文情况、高影响力文献、核心关键词等数据,着重分析在线合作交互行为研究中社会认知、多元化学习环境、技术支持和学习者能力水平等因素对交互行为的影响,并提出未来的研究热点将集中于从交互式的学习环境、教与学策略、博弈论或对策论视角探究合作交互行为的差异,从而继续优化在线合作交互行为分析模型。研究结果表明:网络学习环境中在线合作交互行为分析的研究前沿将从交互对象、交互环境和学习策略拓展到学习者行为的预测和优化策略。展开更多
The tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel were investigated using a ring-on-block test rig in both artificial seawater and distilled water. It is found that fr...The tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel were investigated using a ring-on-block test rig in both artificial seawater and distilled water. It is found that friction coefficients are in general larger in distilled water compared with seawater. The wear losses of Ti-6Al-4V and Monel K500 alloys are larger in seawater compared with distilled water. The mechanical action can destroy the passive film and increase the corrosion rate. The synergism effect between corrosion and wear occurs. The synergism action between corrosion and wear is related to the corrosion rate and with the increase of corrosion rate, the synergism becomes more important. 316 stainless steel suffers severe wear sliding against Monel K500 alloy compared with sliding against Ti-6Al-4V alloy in both distilled water and seawater.展开更多
文摘人工智能为在线合作学习提供了一定的技术支持,学习者能够依托媒体进行在线交互与合作学习。目前已有多种在线合作交互行为分析模型,但在线合作中的交互涉及多个维度,这些交互的分类在概念界定上存在包含和交叉,且在交互维度中探究在线合作问题解决仍存在空白。为了更好地服务网络学习环境中的交互行为分析,为在线交互中的合作问题解决提供研究基础,研究以2010至2019年间Web of Science数据库核心合集收录的网络学习环境中交互行为研究为主题的论文为样本,运用CiteSpace软件绘制可视化分析图谱,并通过二次文献分析,对在线合作交互行为研究进行梳理。通过收集发文情况、高影响力文献、核心关键词等数据,着重分析在线合作交互行为研究中社会认知、多元化学习环境、技术支持和学习者能力水平等因素对交互行为的影响,并提出未来的研究热点将集中于从交互式的学习环境、教与学策略、博弈论或对策论视角探究合作交互行为的差异,从而继续优化在线合作交互行为分析模型。研究结果表明:网络学习环境中在线合作交互行为分析的研究前沿将从交互对象、交互环境和学习策略拓展到学习者行为的预测和优化策略。
基金Project (50823008) supported by the National Natural Science Foundation of ChinaProject (2009AA03Z105) supported by the High-tech Research and Development Program of China
文摘The tribocorrosion behaviors of Ti-6Al-4V and Monel K500 alloys sliding against 316 stainless steel were investigated using a ring-on-block test rig in both artificial seawater and distilled water. It is found that friction coefficients are in general larger in distilled water compared with seawater. The wear losses of Ti-6Al-4V and Monel K500 alloys are larger in seawater compared with distilled water. The mechanical action can destroy the passive film and increase the corrosion rate. The synergism effect between corrosion and wear occurs. The synergism action between corrosion and wear is related to the corrosion rate and with the increase of corrosion rate, the synergism becomes more important. 316 stainless steel suffers severe wear sliding against Monel K500 alloy compared with sliding against Ti-6Al-4V alloy in both distilled water and seawater.