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]
A specially structured drill bit is designed for a reverse circulation down-the-hole air hammer to reduce dust production in the local vicinity of the drilling site during operation. Computational fluid dynamics and exp. [pdf]
The capacities of rotary-screw compressors are typically rated in (HP), ()* and (PSIG.) For units in the 5 through 30 HP range the physical size of these units are comparable to a typical two-stage compressor. As increases, there is a substantial economy of scale in favor of the rotary-screw compressors. As an example, a 250 HP compound compressor is a large piece of equipment th. [pdf]
The capacities of rotary-screw compressors are typically rated in (HP), ()* and (PSIG.) For units in the 5 through 30 HP range the physical size of these units are comparable to a typical two-stage compressor. As increases, there is a substantial economy of scale in favor of the rotary-screw compressors. As an example, a 250 HP compound compressor is a large piece of equipment th. [pdf]
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