in this research fe-tio2 nanocomposites with different molar ratios of fe/ti were prepared as nano-photocatalyst using a modified sol-gel process at ambient temperature. crystallographic properties of nanocomposites were characterized by x-ray diffraction (xrd). surface morphology and mean particle size of nanocomposites were specified by field emission scanning electron microscopy (fesem) and ...

Multilevel PWM waveforms can be decomposed into several multilevel PWM components. Phase-shifted carrier (PSC) is an efficient decomposition technique. In this paper, we have first demonstrated the equality of PSC and alternative phase opposition disposition techniques. Second, we have modified PSC to accommodate other disposition techniques. Third, we have investigated the effects of using...

obtaining a seismic section with high temporal and spatial resolution was always one of the goals of seismic data processors and interpreters. accurate estimation of the thicknesses of thin beds is an important tool in this regard. the basic problem is that the wavelength of the signal must be similar in dimention to that of the bed thinness. if it is much longer than the bed thinness, the dete...

Phase Spectrum for Imaging Information Analysis This paper is aimed at developing phase spectrum methods and technology to analyze information for recognition static and dynamic images produced by serially organized data. These include voice, sound, serial business data, etc. Phase Spectrum Background Spectrum analysis plays a central role in the area of voice recognition and similar applicatio...

This paper proposes the statistical analysis of phase-only correlation functions between two real signals with phase-spectrum differences. For real signals, their phase-spectrum differences have oddsymmetry with respect to frequency indices. We assume phase-spectrum differences between two signals to be random variables. We next derive the expectation and variance of the POC functions consideri...

Short-time Fourier transform of speech signal has two components: magnitude spectrum and phase spectrum. In this paper, relative importance of short-time magnitude and phase spectra on speech perception is investigated. Human perception experiments are conducted to measure intelligibility of speech tokens synthesized either from magnitude spectrum or phase spectrum. It is traditionally believed...