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With the advent of the "Internet plus" era, a number of companies have established the service platform of taxi-hailing apps relying on the mobile Internet, which builds up a communication bridge between passengers and taxi drivers. Besides, taxi companies have initiated many subsidy programs. Based on the prediction model of passenger waiting time built in this paper, it has been proved that there exists a negative correlation between passenger waiting time and taxi empty-loaded rate. This paper also analyzes the influencing factors of taxi empty-loaded rate. The results show that the higher the taxi sharing rate is, the lower the taxi empty-loaded rate is. And the longer the average operation time is, the higher the taxi empty-loaded rate is. By comparing various taxi subsidy programs, this paper finally draws a conclusion that it will be much more difficult to take a taxi if taxi companies provide subsidies for passengers. But the difficulty in taking a taxi can be alleviated if taxi companies provide subsidies for taxi drivers.

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Lightning is one of the most common and spectacular natural phenomena in atmospheric discharge. Beginning with the pioneering studies by Benjamin Franklin who proved that lightning is electricity and invented the lightning rod, mankind has never stopped the pace of lightning research which contributes to power systems, electronic communication, buildings, and life safety (Zeng et al., 2016). But even today, despite a long history of research, there are still a lot of unanswered questions and controversies about the mechanism of lightning in the study of atmospheric electrophysics. One of the biggest mysteries is how lightning is triggered within a thunderstorm cloud. The difficulty here is that the maximum measured electric field values in thunderclouds are typically 1 × 10 5 to 4 × 10 5 V/m (