Chinese Academy of Sciences

University of Science and Technology Beijing

North China Institute of Science and Technology

Beijing Anke Xingye Science and Technology Co., Ltd.

Huan Li

Tao Zhou

Gang Yao

Jinhai Liu

Xiaoqin Wang

Sitao Zhu

Yitong Huang

Quande Wei

Chen Guo

Zhen Kong

Fuxing Jiang

Gaoang Wang

Shaohua Sun

Qingbo He

Xiaocheng Qu

The present disclosure provides a coal bump control method for sectional hydraulic fracturing regions of a near vertical ultra thick coal seam. The method includes: deepening a main shaft from a mining level to a fracturing level; excavating a cross-hole from a roof rock layer of a coal seam at the fracturing level to enter a coal seam being mined, and excavating a roadway along the strike of the coal seam; and drilling hydraulic fracturing boreholes in a dedicated fracturing roadway along an inclination angle of the coal seam to the coal seam above the roadway, wherein the length of the borehole makes the borehole in communication with a goaf, and the spacing of the boreholes along the strike and the sectional spacing of the boreholes in an inclination direction are designed according to the parameters of fracturing equipments and the fracturing length.

Coal bump control method for sectional hydraulic fracturing regions of near vertical ultra thick coal seam

A method for concurrent reading of mixed radix DFT/IDFT data, a method for concurrent calculation of mixed radix DFT/IDFT method, an apparatus for concurrent reading of mixed radix DFT/IDFT data, and an apparatus for concurrent calculation of mixed radix DFT/IDFT. The method for concurrent reading includes: configuring dual circulation parameters according to the number of points corresponding to the number of series to be computed and the number of points corresponding to the number of series accomplished; then, determining the value size between the maximum number of concurrently read data and the product of the number of points corresponding to the number of series accomplished; and based on the result of determination, calculating the dual circulation parameters corresponding thereto according to the result of determination, and concurrently reading data based on the calculated dual circulation parameters.

Method and apparatus for concurrent reading and calculation of mixed radix DFT/IDFT

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Beijing, China

Huan Li