self-concept component and its relationship with family structure and perceived parental rearing practices was examined in a sample of 163 adolescents ( 87 girls and 76 boys, aged 16 years old) selected randomly from high schools in tabriz. the subjects completed tennessee self-concept scale with 84 items and a 77-item inventory measuring parental rearing practices. results revealed no signific...

although studies on the relation between size and efficiency are ample, studies on the relation between size, fragmentation, and efficiency are limited. it is the purpose of this study in which a single-stage stochastic parametric approach is used. for this purpose production of wheat in iran is a good case because wheat is the core commodity of the iranian agricultural system which is dominate...