در روزهای آغازین ورود موبایل به ایران، هیچ کس تصور نمی کرد ظرف مدت حدود سال شمار استفاده کنندگان از این وسیله به حدود میلیون مشترک برسد. اما با گذشت زمان این امر تحقق یافت و تعداد مشترکین سه اپراتور در حال حاضر به حدود میلیون رسیده است. امروزه موبایل به جز تماس های تلفنی برای مردم ایران استفاده های دیگری نیز دارد که از جمله میتوان به پرداخت قبوض، اطلاع رسانی ارگانها و نهادها، گرفتن گزارش از حس...

this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...

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...

today the image of a permanent skeletal space of cities affected by some forces or mechanisms is put in time with social-economic development and while imposes a new face and perspective to physical anatomy of cities, and prepares field to changes in content and social- economic structures of cities too. simultaneously with quitting villages in order to settle in cities by villagers, the phen...