The main objective of this project is single-phase to three-phase drive system composed of High power density PWM rectifiers with active ripple energy storage.The proposed topology permits to reduce the rectifier switch currents, the harmonic distortion at the input converter side and presents improvements on the fault tolerance characteristics. With the decrease in the number of switches, the ...

The main objective of this project is single-phase to three-phase drive system composed of High power density PWM rectifiers with active ripple energy storage. The proposed topology permits to reduce the rectifier switch currents, the harmonic distortion at the input converter side and presents improvements on the fault tolerance characteristics. With the decrease in the number of switches, the...

in this article, the effect of the nonextensivity parameter on the energy fluctuations of nonextensive systems is studied in two different versions of the tsallis statistical mechanics. once a general expression has been reported for the energy fluctuations in the second version (tsallis work in 1988), the energy fluctuations of an ideal gas and a harmonic oscillator are studied in the second a...

Visual motion is sensed by low-level (energy-based) and high-level (feature-based) mechanisms. Ocular following responses (OFR) were elicited in humans by applying horizontal motion to vertical square-wave gratings lacking the fundamental ("missing fundamental stimulus"). Motion consisted of successive 1/4-wavelength steps, so the features and 4n+1 harmonics (where n=integer) shifted forwards, ...

This paper proposes a robust feature extraction for voice activity detection (VAD) in noisy environments where nonstationary noises exist. The accuracy of the VAD is drastically reduced because the fluctuation of features at the noise intervals causes false alarm rate to being increased. In this paper, in order to improve the VAD accuracy, harmonic-weighted energy is proposed. This feature extr...

This paper proposes a novel approach to extract the pitches of singing voices from monaural polyphonic songs. The hidden Markov model (HMM) is adopted to model the transition between adjacent singing pitches in time, and the relationships between melody and its chord, which is implicitly represented by features extracted from the spectrum. Moreover, another set of features which represents the ...

The multidimensional topography of the collective potential energy function of a so-called strong glass former (silica) is analyzed by means of classical molecular dynamics calculations. Features qualitatively similar to those of fragile glasses are recovered at high temperatures : in particular an intrinsic characteristic temperature T c ' 3500K is evidenced above which the system starts to in...

Starting from wavelet analysis of chaotic signals’ time-frequency characteristic, we propose a new harmonic signals extraction method using Empirical Mode Decomposition (EMD). We analyze features of chaotic signals using wavelet transform to determine the parameters of harmonic signals and interference signals. The harmonic signals as source signals are hidden within chaotic energy accumulation...

‎We consider the oscillator group equipped with‎ ‎a biinvariant Lorentzian metric‎. ‎Some geometrical properties of this space and the harmonicity properties of left-invariant vector fields on this space are determined‎. ‎In some cases‎, ‎all these vector fields are critical points for the energy functional‎ ‎restricted to vector fields‎. ‎Left-invariant vector fields defining harmonic maps are...