The dart leader development process of an altitude‐triggered lightning flash with eight return strokes was analyzed. The analysis, based on the high‐speed camera and electric field data, revealed three different processes of dart leaders: (a) normal dart leader process; (b) dart leader process with chasing leader; and (c) dart leader process with bidirectional leader. These dart leaders are very different in terms of the average 2‐D speed and the electric field change. Moreover, in the bidirectional leader process, the 2‐D speed of the upward positive leader is greater than that of the downward negative leader. A piecewise‐speed source‐charge model was used to simulate the electric field change of the normal dart leader. The superposition of downward positive leader was used to simulate the fading and decaying process of the leader tail, which appeared in the chasing leader and bidirectional leader. The bidirectional leader model was used to simulate the bidirectional leader process, and the final simulation results are in good agreement with the measured electric field.
Abstract-this paper lists traditional education and its disadvantages, on the basis of traditional education, O2O education model is put forward. The characteristic of O2O education mode is the combination of online and offline education. Innovative experiment plays an important role in O2O education mode. This paper introduces the concrete implementation of O2O education in Anhui Information Engineering College and some related achievements. Finally, it comes to the conclusion that O2O education model is of great significance for educational innovation and student training, while O2O education model is the trend of education development.
Abstract-Enterprise practice is an important teaching link in the training of Applied Talents in universities. It is particularly important for colleges to manage students' internship. This article puts forward a one-stop management model from three aspects of the preparatory work, the internship, the employment and so on. It lays a solid foundation for standardizing the students' practice and satisfying employment. The application mode of enterprise practice, job transfer and one-stop service has solved the problem of difficult employment and poor quality of employment to a certain extent, and provided a new way of thinking for training talents in applied universities.
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