Low voltage simulation tests were performed to investigate the possibility of suppressing Very Fast Transients (VFT) in Gas Insulated Substations (GIS) by ferrite rings. It is shown in the tests that putting ferrite rings around a conductor can change its wave impedance and damp the travelling waves propagating through. This suppression effect depends on the characteristics of the ferrite materials, including high frequency response, magnetic conductivity, loss and saturation.
Nowadays, parents attach importance to their children's primary education but often lack time and correct pedagogical principles to accompany their children's learning. Besides, existing learning systems cannot perceive children's emotional changes. They may also cause children's self‐control and cognitive problems due to smart devices such as mobile phones and tablets. To tackle these issues, we propose an intelligent companion learning system to accompany children in learning English words, namely the Intelligent Augmented Reality Educator (IARE). The IARE realizes the perception and feedback of children's engagement through the intelligent agent (IA) module, and presents the humanized interaction based on projective Augmented Reality (AR). Specifically, IA perceives the children's learning engagement change and spelling status in real‐time through our online lightweight temporal multiple instance attention module and character recognition module, based on which analyses the performance of the individual learning process and gives appropriate feedback and guidance. We allow children to interact with physical letters, thus avoiding the excessive interference of electronic devices. To test the efficacy of our system, we conduct a pilot study with 14 English learning children. The results show that our system can significantly improve children's intrinsic motivation and self‐efficacy.
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