1Research on the development strategy of convention and exhibition economy in tier 1 cities ——Taking Shanghai as an exampleXING Ying-li1-42Analysis of civil air defense tunnel detection technology based on 3D laser scanning technologyLIN Bo-wen, HUANG Ling50-523Spectral measurement and remote sensing information extraction of iron tailingsSUN Qing-song, TAN Sheng-jie, SONG Hong-li58-594Research progress of river ecological slope protectionZHOU Shu-huan, GENG Nan, LIN Xian-da, YU Wen, FEI Si-yi, TONG Ru-meng118-1195Time series forecasting based on wavelet analysisHUANG Yu-meng, ZHU Yun-hua, HU Yao, ZHOU Xin-lu128-130