No abstract

As one of the effective ways to mitigate earthquake hazards, earthquake early warning (EEW) has been studies by many countries and regions around the world and significant mitigation effectiveness has been achieved during practical application. However, the data format for real-time data transmission in these EEW systems is organized as one packet per second which will lead to certain day when using first three seconds P wave data for τ c &P d calculation. In this case, if P wave arrival of an earthquake is at the first half of a packet, the data latency will be more than 0.5 s. To address this problem, we develop a new type of seismic recorder called EDAS-24GN with low-latency real-time data output for EEW. It can transfer real-time data by one packet per 0.1 s so that the leading time can be improved with 0.8 s at maximum. This will be very useful for areas close to the epicenter.

Acute alcoholic liver injury (AALI) is hard to be diagnosed on account of no obvious clinical symptoms, thereby it is easily developed to serious liver diseases and is threatening people’s...

When the fundamental frequency is shifting, it's hard for traditional repetitive controller to work at the resonant frequencies. In this paper, a novel self-adaptive repetitive controller is proposed to suppress the current harmonics. This controller can adjust the sampling times in the grid cycles based on a special self-adaptive control algorithm. Mathematical analysis, simulations and physical experiments have validated the effectiveness of the self-adaptive repetitive controller.