id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
esrj-78750	Wang, Bo; Liu, Shengdong; Jin, Biao; Qiu, Wanyong	Fine Imaging by Using Advanced Detection of Reflected Waves in Underground Coal Mine	2019	7	.pdf	application/pdf	4497	192	48	However, in the process of calculating eigenvalues and eigenvectors and setting filtering function, corresponding relations between XYZ coordinate axes and P, SH, SV directions are usually artificially, without considering the corresponding relationship between the principal polarization direction of real-time particle in each receiver and propagation direction of seismic wave, which makes the results of unclean separation of P- and S-waves in the roadway. Research and analysis of forward prediction technology using seismic reflection wave in tunnel and laneway in China.	cache/esrj-78750.pdf	txt/esrj-78750.txt