Abstract: Embodiments of the present application provide a prediction method, device and system for rock mass instability stages, and belong to the technical field of rock mass instability prediction. The method includes the steps: acquiring acoustic emission signals of rock mass; extracting feature parameters from the acquired acoustic emission signals; and predicting instability stages of the rock mass in accordance with the feature parameters and a preset back propagation (BP) neural network model, wherein the preset BP neural network model is obtained by training a BP neural network and a genetic algorithm by virtue of the feature parameters of the acoustic emission signals at different rock mass instability stages. According to the technical solution in the present application, the problem in the training process of the BP neural network model that model parameter optimization may be easily trapped in a locally optimal solution is effectively solved.

Abstract: A surface water quality monitoring method based on a high spatial resolution satellite includes: step 1. building standard surface water quality pools by mixing natural water bodies with clean water in different proportions to obtain surface water quality data; step 2. obtaining high spatial resolution remote sensing images for processing; step 3. identifying remote sensing bands with higher correlation through correlation analysis by presetting ratio values of remote sensor data bands and the standard surface water quality pools; step 4. building a water quality parameter retrieval model, and comparing and retrieving the remote sensing bands with higher correlation and the surface water quality data to obtain water quality data; and step 5. identifying abnormal points of the water quality based on the water quality data and water quality data threshold of the surface water.

Abstract: A device and a method for producing a high-purity industrial silicon, wherein the device is a refining ladle provided with a steel plate layer, a heat insulation layer, a heat preservation layer, a protective layer and a working layer from outside to inside. The refining ladle is provided with two conical oxygen inlet channels and two conical argon inlet channels at the bottom. The method comprises: preparing a molten silicon with temperature?2200° C.; pouring the molten silicon into a refining ladle after introducing oxygen and argon thereto and keeping the gas pressure at 1 standard atmospheric pressure, and keeping the molten silicon at 1700-1900° C.; adding a slag-forming agent thereto, and introducing oxygen and argon from the refining ladle bottom, obtaining a slag molten silicon; cooling the slag molten silicon to ambient temperature, solidifying and separating, obtaining a high-purity industrial silicon.