نتایج جستجو برای: day irregularities after carrying out this phases
تعداد نتایج: 7253483 فیلتر نتایج به سال:
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 ...
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...
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...
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...
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...
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...
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...
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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