1Research on federated learning scheme based on homomorphic encryptionLIANG Ya-nan1-32Research of 'urban brain' empowering urban governance modernization:Based on a practical analysis of Xining city,Qinghai ProvinceDONG Hong-ni, ZHOU Zhi-cheng, DU Hai-feng, ZHAO Tie-jun, DU Zhen22-263Analysis of influence of urban bridge foundation on existing subway section structureLI Jun-long30-324Innovation research on smart pension ecosystemLI Yi-xuan36-385Application dilemma and countermeasures of BIM technology in construction industry in Guizhou ProvinceZHENG Guo-wei, CHENG Ming-man, WANG qin, WEN Li-le39-416Preparation and performance analysis of PET halogen-free flame retardant materialsWANG Yan-dong42-447Analysis of optimization measures for racemization processZHOU Duo-xiang45-478Design of intelligent inventory system driven by materials informationYAO Li-juan, ZHANG Shuang, FENG Ming54-569Analysis of obstacles and countermeasures for application of BIM technology in village and town construction under background of rural revitalizationTU Xian-li, CHEN Ming-man, LI Xiao-xiao57-5910Analysis on human resource management of private coal enterprises under the background of intelligenceWANG Yan-hong, CAO Wen-tao, WANG Yue-fang60-62