نتایج جستجو برای: dose reduction

تعداد نتایج: 774229  

Journal: :Japanese Journal of Radiological Technology 1997

Journal: :Acta Crystallographica Section D Biological Crystallography 2003

Journal: :SN computer science 2023

Abstract This study aims to determine an acquisitional and computational workflow that yields the highest quality spatio-spectral reconstructions in four-dimensional neutron tomography studies. The properties of neutrons enable unique image contrast modes, but accessing these modes requires defining energy beam, resulting long acquisition times. We seek sparse angular approaches collect order 1...

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 ...

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