نتایج جستجو برای: day irregularities after carrying out this phases

تعداد نتایج: 7253483  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند 1388

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 ...

Journal: :iranian red crescent medical journal 0
mohsen abbasi department of emergency medicine, tehran university of medical sciences, tehran, ir iran m hossein salehnia department of emergency medicine, isfahan university of medical sciences, isfahan, ir iran; department of emergency medicine, isfahan university of medical sciences, isfahan, ir iran. tel.: +98-3116692174, fax: +98-3116684510

background in the past 10 years, 13 fatal earthquakes have occurred in iran and led to death of 30,000 people whom most of them were killed in the earlier hours of the disaster. disaster medical assistance teams are groups of trained medical and non-medical personnel with various combinations that on the optimal conditions are deployed just within 8 hours of notification and are able to work se...

Journal: :فیزیک زمین و فضا 0
اشرف اسدی استادیار، گروه جغرافیای طبیعی، دانشگاه پیام نور، ایران سید ابوالفضل مسعودیان استاد، گروه جغرافیای طبیعی، دانشگاه اصفهان، ایران

temperature is one of the essential elements of forming a climate and plays a crucial role in the lives of flora, fauna and human activities. the extreme temperature is one of the thermal indexes in meteorological and climatological studies. the extreme temperature is divided into two types: the extreme warm and extreme cold. the extreme warm includes the temperatures much above the normal valu...

Journal: :Palgrave Communications 2017

Journal: :Advances in Space Research 2021

In this study, the association of Equatorial Ionization Anomaly (EIA) with various post sunset ionospheric irregularity manifestations are brought out empirically using Global Positioning System derived Total Electron Content (GPS - TEC) data from five stations centered around 77° E longitude as well ionosonde at a dip equatorial station Trivandrum (geographic latitude 8.5° N ; geographic E) fo...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1392

critical thinking ability has an important role in education. accordingly, scholars around the world are searching for new ways for teaching and improving students critical thinking ability. in line with the studies in efl contexts supporting the positive relationship between critical thinking and writing performances, this study investigated the differential effects of halverson’s critical thi...

Journal: :Remote Sensing 2021

Irregularities in electron density usually correlate with ionospheric plasma perturbations. These variations causing radio signal fluctuations, response, generate scintillations that frequently occur low-latitude regions. In this research, the combination of an artificial neural network (ANN) genetic algorithm (GA) was implemented to predict scintillations. The GA method considered for obtainin...

Journal: :علوم زیستی ورزشی 0
علی رضا صفرزاده استادیار دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه مازندران ملیحه حاجی زاده رستمی کارشناس ارشد فیزیولوژی ورزش دانشگاه آزاد اسلامی واحد علوم و تحقیقات مازندران الهه طالبی گرکانی دانشیار دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه مازندران رزیتا فتحی دانشیار دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه مازندران

omentin-1 is a novel adipokine that is predominantly secreted by visceral adipose tissue. circulating levels of omentin-1 is inversely related to obesity. there is limited information about the effect of exercise training on serum omentin-1 concentration. the aim of this study was to investigate the effect of four weeks of progressive resistance training on serum omentin-1 levels. 16 male wiste...

Journal: :The Musical Times 1914

حاجی‌زمانی, محسن, علیزاده, مصطفی,

Sodium molybdate (Na2MoO4) as a grain refiner was used to refine the microstructure of Al-0.7Fe alloy. Al-Fe samples with the addition of 0.1, 0.2, 0.3, 0.4 and 0.5 wt.% sodium molybdate were fabricated by casting in sand molds at 750 ͦC. The microstructures of the as-cast samples were investigated by scanning electron microscopy (SEM) and the present phases were revealed by X-ray diffraction (X...

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