The related factors of ground movement and deformation was analyzed in coal mining, geological conditions, Analytic Hierarchy Process to establish a mining methods, mining subsidence formation time, covered lithology, mining depth and thickness ratio, horizontal deformation, curvature radius, inclination, and subsidence value of the gob as the main indicator of the type of evaluation system based on evaluation system divided into different risk levels, and to take appropriate measures to deal with different risk levels. Combined with Second West-East Gas Pipeline Ningshan branch instantiated demonstration showed Hengfa Mined subsidence gas pipeline risk assessment results coincide with the actual impact of the case, to prove that this evaluation method has great practical application guidance.
During long-time charge-discharge cycling, the capacity of the vanadium redox flow battery (VRFB) will reduce gradually. To recognize the capacity loss condition in the time of the operation process, a method for classification of the capacity loss degree based on Probabilistic Neural Network (PNN) is presented. The network inputs are the value of the voltage per second and the average power of the cell stack in any two minutes of the circulation. The network will give out three classes in form of three numbers to classify the capacity loss degree into different levels. The network is trained and validated by experimental data and the results show that the network is suitable for the classification problem of VRFB capacity loss and the method is useful to determine whether the capacity is sufficient and when to restore the cell capacity in real time.
The research on the history of load and temperature to the influence of rock’s damage and fracture is rare. Commonly, it takes no account of the order of load and temperature and despite how the load’s history which arose its damage of thermal fracture is, the process of damage evolvement and the intensity of fracture is same as long as adds of carry is similar to temperature value. However, the thermal influenced by the history of adds of temperature and the result will be different under different order of adds of carry. This paper carries through meso-structure experiment of different order of adds of carry and temperature by the numbers, observe the process of limestone’s thermal crack damage under the different order of adds of temperature and carry on real time with instrument such as DaoJin High Temperature Fatigue Testing System with Scanning Electron Microscope. In the view of the rock’s tiny crack growth, compute its crack tip energy release rate under different order of adds of carry. The result of theory and experiment indicate that the fracture of rock’s thermal cracking are intensively influenced by the history of adds of carry.
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