a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...

Purpose: Technologies in general and media in particular influence their audience through their form and content. There are many studies about the role and effect of classic media on values change; however, few studies have explored new emergent media such as social networks. The aim of this descriptive-survey research is to investigate how time spent on social network and social network addict...

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...

چکیده : نظام انتخاباتی قواعد و چار چوب های به رسمیت شناخته شده ای است که بیانگر چگونگی تبدیل آرای مردم به مناصب و پست های سیاسی است. این نظام انتخابات باید به گونه ای عمل کند که نتیجه آن فراهم شدن مکانیسم و ساز و کار مطلوب و مناسب برای برگزاری انتخابات سالم و رقابتی باشد. به نظر می رسد نظام انتخاباتی جمهوری اسلامی ایران دارای ضعف ها و نواقصی است که به سبب آن ها نمی توان انتخابات مطلوب را برگزا...

uncertainty in the financial market will be driven by underlying brownian motions, while the assets are assumed to be general stochastic processes adapted to the filtration of the brownian motions. the goal of this study is to calculate the accumulated wealth in order to optimize the expected terminal value using a suitable utility function. this thesis introduced the lim-wong’s benchmark fun...

the application of e-learning systems - as one of the solutions to the issue of anywhere and anytime learning – is increasingly spreading in the area of education. content management - one of the most important parts of any e-learning system- is in the concern of tutors and teachers through which they can obtain means and paths to achieve the goals of the course and learning objectives. e-learn...

چکیده فارسی عنوان : بررسی تغییرات سرمی سدیم در پیش آگهی ضربه مغزی در سن یک ماه تا 18 سال استاد راهنما : دکتر کیاندخت کریمیان، متخصص طب اورژانس، استادیار دانشگاه اساتید مشاور : دکتر پارسا یوسفی، فوق تخصص کلیه کودکان ، دانشیار دانشگاه دکتر محمد رفیعی، دکترای آمار حیاتی، دانشیار دانشگاه نگارش و پژوهش : مینا شیخی دزفولی مقدمه : ضربه مغزی بعنوان دوره ای کوتاه از فقدان هوشیاری است که چند...