Study on seepage testing of the rebuilding of existing tunnels
zheng jun-jie~1; liang yan~1; zi yi~(1; 2)(1.department of road and bridge engineering; huazhong university of science and technology; wuhan 430074; china; 2.the fourth survey & design institute of china railway; wuhan 430063; china)
Defect feature selection of X-ray image on carbon product
zhou xian~1; tang qin~2(1.school of mechanical and electrical engineering; central south university; changsha 410075; china; 2.hunan industry polytechnic; changsha 410082; china)