Sharif Digital Repository

Selective laser sintering is an additive manufacturing technique based on fusion of powder bed, wherein after spreading a powder layer, a focused laser beam directs onto selected points of powder bed to fuse powder particles together. This process is repeated layer by layer until the final part is created. Although utilization of blade as a conventional powder spreading (CPS) mechanism has a good compression ability, the fixed contact line between blade and powder bed surface results in improper powder flowability and increasing shear forces applied on underneath layer. In this study, in order to obtain the basis for conducting practical experiments, discrete element simulation of powder... 

In this article, asymmetric information is tested via a positive correlation test in the group supplemental health insurance (GSHI). Furthermore, using dynamic features of insurance contracts, moral hazard is separated from learning. For these two tests, Asia Insurance Company longitudinal data, for two types of paraclinical and hospital health services, during the period 2011-2016, is used. We find that the effect of asymmetric information is not significant in hospital services, as there is not any moral hazard in this group, we can conclude that there is also no between-group adverse selection in GSHI. On the other hand, in the group of paraclinical services, there is asymmetric...