The mechanism of failure of heat exchanger and steam generator tube-to-tubesheet joints is related to the level of residual stresses produced in the tube expansion and Wonderswan transition zones during the expansion process and their variation during operation.The accurate prediction of these stresses based on the plastic and creep properties of t

A cross-sectional study was carried out in order to establish the changes of academic burnout, engagement and mental health in Engineering and Health Sciences students at Food the beginning and at the end of a semester of study.The participants were 145 students between 16-36 years old of a Colombian public university, evaluated in February 2015 -