Changgen Mei, received an PhD degree from Southwest Jiaotong University and University of Delaware Joint Doctoral Program, associate director of Department of Environmental Enginee...ver maisChanggen Mei, received an PhD degree from Southwest Jiaotong University and University of Delaware Joint Doctoral Program, associate director of Department of Environmental Engineering ,School of Chemistry and Environmental Engineering , Sichuan University of Science & Engineering, mainly engaged in teaching and research in traffic noise and vibration.ver menos