This paper presents a novel two-dimensional split-vector-radix fast-Fourier-transform (2D svr-FFT) algorithm. The modularizing feature of the 2D svr-FFT structure enables us to explore its characteristics by identifying the local structural property. Each local module is designated as a DFT (non-DFT) block if its output corresponds to DFT (non-DFT) values. The block attribute (DFT or non-DFT) d...

There are three different way to calculate DFT. First method is using formula of DFT or simultaneous equation. Second is Correlation technique and third one is using Fast Fourier Transform (FFT). First method is useful for understanding of basic idea of DFT, but it is not fit for practical and application purpose. In second method is based on detecting known waveform in another signal. It is us...

برخی از گونه ‏های زنبور تریکوگراما، دارای نوعی همزیستی با باکتری Wolbachia هستندکه باعث القاء بکرماده ‏زایی در آنها می‏شود. جمعیت‌هایی این پارازیتوئید تخم آفات که نتاج ماده بیشتری تولید می‌کنند، می‌توانند بالقوه توان بالاتری برخوردار باشند. پس شناسایی یک جمعیت بومی آلوده به ولباکیا Trichogramma brassicae، بررسی‏ هایی منظور ارزیابی توانایی‌های تک‏جنسی (A) قیاس جمعیت‌‏های دوجنسی طبیعی (B) و تغذیه...

This paper proposes an RST−invariant multi−bit watermarking system based on LPM and DFT. This system embeds the watermark in a rotation and translation invariant domain obtained by first acquiring log−polar mapped DFT (LPM−DFT) magnitudes of an image, and then taking the magnitude of the 1−dimensional DFT along the angular axis of this LPM−DFT magnitudes. Neither the original cover image nor a ...

A review of the literature about calculating the adsorption properties of arsenic onto mineral models using density functional theory (DFT) is presented. Furthermore, this work presents DFT results that show the effect of model charge, hydration, oxidation state, and DFT method on the structures and adsorption energies for As and As onto Fe-(oxyhydr)oxide cluster models. Calculated interatomic ...