: Child labor refers to the employment of children in any work that deprives them oftheir childhood and interferes with their ability attend regular school is mentally, physically,socially or morally dangerous harmful.

Since density is considered as one of the most important numerical indices to explain quantitative values of a plant community by affecting on many aspects and activity of ecosystem, on the other hand, awareness about plants distribution pattern in environment is an essential preparation for measurement and study of vegetative cover, therefore, in this research determination of density and dist...

the study of 10,504 cases of industrial accidents, involving 590,164 injured workers employed in different industries in tehran industrial pole during one year shows that the over all incidence rate is 17.80 with a significant variation in regard to age and the type of industry. furthermore, 96.58% 0t accidents have happened within the workshops. considering the final outcome of the accidents, ...

the purpose of this research is investigation of application of the arbitrage pricing theory and effect of unanticipated changes in a set of macroeconomic variables such as inflation rate, money supply, exchange rate, oil price, term structure and industrial production on expected security return in tehran stock exchange. in this research, data are analyzed quarterly for the period of 1997-2008...