To disclose the effect of contact force and electrode gap on the material transfer behavior of Ag-based contact material, arc-erosion tests of the Ag-4wt.%TiB2 contact material were performed for 5000 operations at 24...To disclose the effect of contact force and electrode gap on the material transfer behavior of Ag-based contact material, arc-erosion tests of the Ag-4wt.%TiB2 contact material were performed for 5000 operations at 24 V/16 A under resistive load on an electric contact material testing system. The arc energy and arc duration were investigated, the surface morphologies of eroded anode and cathode were characterized, the mass changes after arc-erosion tests were determined, and the material transfer behavior was discussed as well. The results show that contact force has a significant effect on the arc energy, arc duration and erosion morphology, but has no impact on the material transfer mode. However, electrode gap not only influences the arc energy, arc duration and surface morphology, but also changes the material transfer mode. At 1 mm, the material transfers from anode to cathode. Nevertheless, an opposite mode presents at 4 mm, which is from cathode to anode.展开更多
2015年起,以深度学习为代表的人工智能技术,迅速与科学研究各个领域相汇聚,并逐渐成为一种通用型科研赋能工具,形成了独特的“AI for Sciences”现象。文章系统梳理了自人工智能诞生之日起,其与科学活动的整体汇聚历程及阶段性特征,并...2015年起,以深度学习为代表的人工智能技术,迅速与科学研究各个领域相汇聚,并逐渐成为一种通用型科研赋能工具,形成了独特的“AI for Sciences”现象。文章系统梳理了自人工智能诞生之日起,其与科学活动的整体汇聚历程及阶段性特征,并结合人工智能研究范式的转变,以及当代科学所面临的高维灾难、数据灾难等问题,分析“AI+科学”热潮形成的动因。通过文献计量学方法,对人工智能与化学、地球科学、天文学、物理学、生物学、材料科学等基础科学的汇聚态势进行分析,在此基础上总结归纳了人工智能技术对科学研究的独特赋能能力,如信息归类的智能化、扩展科学模拟规模、基于数据的科学预测、实现高维方程求解、进行经验试错替代、探索新科学猜想等。展开更多
基金Projects(51274163,51605146) supported by the National Natural Science Foundation of ChinaProject(U1502274) supported by Key Program of the National Natural Science Foundation of China+2 种基金Project(2018M632769) supported by the China Postdoctoral Science FoundationProject(2017SKY-WK010) supported by the Research Fund of Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,ChinaProject(18JK0722) supported by Special Research Program of Shaanxi Provincial Department of Education,China
文摘To disclose the effect of contact force and electrode gap on the material transfer behavior of Ag-based contact material, arc-erosion tests of the Ag-4wt.%TiB2 contact material were performed for 5000 operations at 24 V/16 A under resistive load on an electric contact material testing system. The arc energy and arc duration were investigated, the surface morphologies of eroded anode and cathode were characterized, the mass changes after arc-erosion tests were determined, and the material transfer behavior was discussed as well. The results show that contact force has a significant effect on the arc energy, arc duration and erosion morphology, but has no impact on the material transfer mode. However, electrode gap not only influences the arc energy, arc duration and surface morphology, but also changes the material transfer mode. At 1 mm, the material transfers from anode to cathode. Nevertheless, an opposite mode presents at 4 mm, which is from cathode to anode.
文摘2015年起,以深度学习为代表的人工智能技术,迅速与科学研究各个领域相汇聚,并逐渐成为一种通用型科研赋能工具,形成了独特的“AI for Sciences”现象。文章系统梳理了自人工智能诞生之日起,其与科学活动的整体汇聚历程及阶段性特征,并结合人工智能研究范式的转变,以及当代科学所面临的高维灾难、数据灾难等问题,分析“AI+科学”热潮形成的动因。通过文献计量学方法,对人工智能与化学、地球科学、天文学、物理学、生物学、材料科学等基础科学的汇聚态势进行分析,在此基础上总结归纳了人工智能技术对科学研究的独特赋能能力,如信息归类的智能化、扩展科学模拟规模、基于数据的科学预测、实现高维方程求解、进行经验试错替代、探索新科学猜想等。
