Mr  Mohammad Emad Motieyan Najar  will defend His ph.d dissertation with the title of “  Development of Decision Model for Ballast Cleaning in Railway Track Based on Ballast Quality Index”   on 13/Mar/2019  at 10:30 , amphitheatrr of School of Railway Engineering. The advising professor is professor Javad M. Sadeghi and  Jabar Ali Zakeri.