MICROSCOPIC PORE OF SANDSTONE IN LONGDE COAL MINE BASED ON FHH FRACTAL THEORY

The coal resources in western China are mainly Jurassic coal fields, and Dining Height Table Bases the Jurassic coal measure strata are generally affected by roof composite water, so the water-rich evaluation of roof sandstone aquifer is the premise of safe mining.Taking Longde Coal Mine as the research object, the pore structure characteristics of

Ultrasonic flow meters (UFMs) based on transducer arrays offer several advantages.With electronic beam steering, it is possible to tune the steering angle of the beam for optimal signal-tonoise ratio (SNR) upon reception.Moreover, multiple beams can be generated to propagate through different travel paths, covering a wider section of the flow profi