the purpose of this study was to investigate the impact of blended learning and multimedia softwares on iranian efl students vocabulary learning. in addition, the present study tried to examine the extent to which multimedia softwares can be applied into efl classes in iran. it also attempted to find out students attitudes toward using these softwares. to this end, 87 iranian efl learners at el...

wireless sensor networks (wsns) are one of the most interesting consequences of innovations in different areas of technology including wireless and mobile communications, networking, and sensor design. these networks are considered as a class of wireless networks which are constructed by a set of sensors. a large number of applications have been proposed for wsns. besides having numerous applic...

در این پایان نامه، پاسخ شمارنده تناسبی با پوشش داخلی بور (boron-lined proportional counter) به چشمه نوترون-گامای am-be با یک برنامه فرترن به روش مونت کارلو شبیه سازی شده است. برای این آشکارساز که کاربردهای ویژه ای در شمارش نوترون خصوصاً در چاه پیمایی هسته ای دارد، شاخص های مهم بهینه سازی بهره آشکارسازی، شامل ابعاد آشکارساز، هندسه تابش دهی و ضخامت لایه ی بور بررسی شده و همچنین، شبیه سازی مونت کار...

در این پایان نامه، با استفاده از دو آشکارساز nai(tl) و یک چشمه نوترون am-be، یک ابزار چاه پیمایی با کارایی مناسب پیشنهاد شده است. آشکارسازهایnai(tl) را می توان در اندازه های مختلف به راحتی تهیه کرد. چشمه ی نوترون am-be نیز در و مراکز تحقیقاتی کشور مورد استفاده قرار می گیرد. در مقابل، ابزارهای چاه پیمایی مرسوم آشکارسازهای نوترون (3bf، 3he و نظایر آن) استفاده می کنند که آشکارسازهای گران و شمول تح...

there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...

employees always concern about losing their job , or in other word , losing their income resources. for this purpose, every government requires strong system for covering these concerns. the unemployment insurance (ui) program’s can be used for achieving this goal. in this thesis, we price ui based on the insurance history of employee and the duration of being unemployed. we use the weibull dis...