Le poeme connu Liber Maiorichinus est sans doute l’une des meilleures sources pour comprendre le role tenu par les Pisans durant xie et xiie s. l’importance politique, militaire economique de la ville, dont cette œuvre decrit moment culminant, l’expedition contre iles Baleares dans annees 1113-1115. Les anciens rivaux ville toscane, comme Amalfi, ne parvenaient alors plus a freiner son expansio...

Compte rendu de Doyon-Gosselin, Benoit. Moncton mentor : géocritique d’une ville (2022)

A6airaciThe majority of model-based techniquen proposed to date for solving the multiple source direction-ofarrival (DOA) estimation problem operate under the assumption that the wavefronts impinging on the array are planar. However, when nourcea are located close to the array (i.e., in the near-field), the inherent curvature of the wavefront is no longer negligible. In this paper, we propose t...

In this paper, a new method for automatic sleep stage classification based on time-frequency image (TFI) of electroencephalogram (EEG) signals is proposed. Automatic classification of sleep stages is an important part for diagnosis and treatment of sleep disorders. The smoothed pseudo Wigner-Ville distribution (SPWVD) based time-frequency representation (TFR) of EEG signal has been used to obta...

In this article, a comprehensive study on uncertainty principle of the local polynomial Fourier transform (LPFT) is presented. It shows that the uncertainty product of the LPFT of an arbitrary order is related to the parameters of the signal and the window function, in addition to the errors of estimating the polynomial coefficients. Important factors that affect resolutions of signal represent...

Cardiovasculary diseases are affecting a constantly growing number of people. Due to this reason we are continously looking for new ways of investigations. The processing of the heart’s audio signals also belong to this category. Heart sound is an acoustic wave generated by the mechanical movement of the heart and blood. The sounds can be divided into normal heart sounds and heart murmurs. Murm...

In this paper, a wave propagation model is developed to investigate the wave propagation in fluid-filled steel pipe. Based on the Kennard shell equations the investigation is achieved under the conditions of coupling between the shell elastic acoustic field and the interior fluid acoustic field. Tests are conducted on fluid-filled pipeline blockage detection. An active acoustic source is used t...

AbstraciThe following is a presentation of echo detection techniques based on time-frequency signal analysis for the measuring of thickness in thin multilayer structures. These techniques are shown to provide high-resolution signal characterization in a time-frequency space, and good noise rejection performance. In particular, the Short-Time Fourier Transform, the Gabor expansion, the Cross-Amb...

The peak of the polynomial Wigner–Ville distribution (PWVD) has been recently proposed as an estimator of the instantaneous frequency (IF) for a monocomponent polynomial frequency modulated (FM) signal. In this paper, we evaluate the statistical performance of this estimator in the case of additive white Gaussian noise and provide an analytical expression for the variance. We show that for a gi...