The profitability of momentum and contrarian strategies indicates the predictability of stock returns, so these strategies contradict the concept of market efficiency. This paper investigates the profitability of intermediate and short-term horizon trading strategies in Tehran Stock Exchange. To do this, a sample of 50 companies accepted in Tehran Stock Exchange for the period of 2002 to 2007 w...

The term of office of joint stock corporate directors and managing directors, unlike other companies, is limited to a period of time. However, due to the different legal positions they have, their acts and transactions do not bear similar . In addition, there is also disagreement about the legal effects of directors after the termination of their office. According to one opinion, by having th...

the purpose of the present study was to investigate the effect of task-based instruction of vocabulary on the receptive and oral productive acquisition of english vocabulary and compare the results with those obtained from the traditional method. the method and procedure applied in this study was as follows: after the implementation of opt, a group of sixty female students were chosen. the stu...

among the low–dimensional allotropes of carbon, nanotubes and graphene have attracted very much attention from nano–science and nanotechnology specialists. they have been proposed as building blocks in nanometer device engineering. however, these structures are not defect–free. in this thesis, we focused on defective carbon nanotubes and graphene, and studied the effect of couple of very common...