To reduce the gas disaster of high gas coal seam and improve the efficiency of gas extraction by high drilling, the layout parameters of drilling holes in Pingdingshan coal mine are optimized. Based o. [pdf]
Xiong'an New Area is a in the area of , China. Established in April 2017, the area is located about 100 kilometers (62 mi) south of and 50 kilometers (31 mi) east of downtown . Its main function is to serve as a development hub for the Beijing-Tianjin-Hebei () economic triangle. Additionally, nonessential functions of the Chinese capital. [pdf]
Rotary-screw compressors use two very closely meshing spiral rotors to compress the gas. In a dry-running rotary-screw compressor, timing gears ensure that the male and female rotors maintain precise alignment without contact which would produce rapid wear. In an oil-flooded rotary-screw compressor, lubricating oil bridges the space between the rotors, both providing a hydraulic seal and transferring mechanical energy between the rotors, allowing one rotor to be e. [pdf]
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