Abstract: Disclosed is a massive data-driven method for automatically locating a mine microseismic source, including: constructing a microseismic wave calibration data set by using a large-scale seismic data set containing seismic signals and non-seismic signals; constructing a pre-training calibration model based on a full convolution neural network through deep learning of a seismic wave calibration data set; using microseismic data of mine sites for transfer learning of an initial arrival time calibration model to construct an arrival time automatic calibration model suitable for mine microseismic signals; and automatically as well as accurately locating mine microseismic events based on an isokinetic homogeneous isotropic velocity model by using an optimization algorithm to deduce arrival time errors and through repeated iteration and fine-tuning.

Abstract: A direction signal light for bicycle is disclosed.

Abstract: The variable-frequency battery revitalizing device contains a pulse generation circuit, a frequency generation circuit, a voltage detection circuit, and a frequency control circuit. A lead-acid battery to be revitalized is connected to the pulse generation circuit without being taken off duty and provides electricity to the battery revitalizing device. The voltage detection circuit senses the voltage of the battery being revitalized and produces an appropriate control signal to the frequency control circuit, which in turn determines the frequency of the clock signal produced by the frequency generation circuit. The clock signal drives the pulse generation circuit to produce pulses at the desired frequency and apply the pulses to the battery, thereby completing a feedback loop to automatically adjust the frequency of the pulses applied to the battery.

Abstract: The device contains a pulse generation circuit, a frequency generation circuit, a voltage detection circuit, and a frequency control circuit. A positive terminal of a lead-acid battery of a motor vehicle is connected to the pulse generation circuit and the voltage detection circuit. The pulse generation circuit is connected to the positive terminal of the battery, the frequency generation circuit, and the frequency control circuit. The frequency generation circuit is connected to voltage detection circuit, the frequency control circuit, and the pulse generation circuit. The voltage detection circuit is connected to the positive terminal of the battery, the frequency generation circuit, and the frequency control circuit. The frequency control circuit is connected to the voltage detection circuit, the frequency generation circuit, and the pulse generation circuit.

Abstract: The device is an impulse generator which produces very high-frequency pulses. The device is installed along the primary circuit of the ignition system. The high-frequency pulses running through the primary circuit will induce similarly high-frequency pulses on the secondary circuit via the ignition coil. The induced high-frequency pulses then run though the spark plugs via the secondary circuit. These pulses will not add to additional burden to the ignition system but can effectively prevent the build-up of electrically resistive materials, especially the deposits on the spark plugs.