Sharif Digital Repository

This thesis aims to the study of quality-quantity trade off in the family through investigating the effects of family size and birth order on their educational attainment. The latter has been chosen as a criteria for measuring the quality; to measure the effects of quantity we have used the twins for the instrumental variable as an endogenous shock in the family size to reduce bias that happens as a result of omitted variables bias and to measure the effect of family size on it’s quality more accurately. We have also used censored regression to eliminate the bias of student children in the sample.In addition to concentrating on the differences between children of different family sizes we... 

Injuries to the peripheral nervous system, parallel muscle tissues, and similar sensitive tissues such as the heart and bone are considered one of the fundamental challenges in regenerative medicine and can result in motor and sensory disorders and, in some cases, permanent disabilities. Despite their relative effectiveness, common treatments such as autologous nerve transplantation have limitations such as lack of donor tissue and the possibility of incomplete healing. Therefore, the development of novel approaches using tissue engineering has gained special importance. The present study aimed to design and fabricate a multifunctional drug-delivery artificial scaffold that simultaneously...