Mathieu Beirlaen Mathieu Beirlaen obtained his PhD in philosophical logic at Ghent University in 2012, under the supervision of Joke Meheus and Christian Straßer. He worked as a postdoctoral researcher at Ghent University until February 2013, after which he became postdoctoral fellow at the National Autonomous University of Mexico (UNAM) in Mexico City. In January 2015, he moved to Bochum to jo...

PURPOSE To compare the outcomes of Mathieu and Snodgrass techniques in the repair of anterior distal shaft hypospadias. MATERIALS AND METHODS From 2001 to 2003, 33 patients with the mean age of 7.06 +/- 3.44 (range 2 to 12) years suffering from anterior distal shaft hypospadias, were assessed. Inclusion criteria were anterior distal shaft hypospadias, and exclusion criteria were association w...

Two dimensions Mathieu equation containing periodic terms as well as the delayed parameters has been investigated in the present work. The present system represents to a generalized form of the one-dimension delay Mathieu equation. The mathematical difficulty for delay the coupled Mathieu equation has been overcome by using the matrices method. Properties of inverse complex matrices enable us t...

BACKGROUND This study was carried out to compare the operative time and rate of complications of Mathieu and Snodgrass procedures for the repair of primary anterior hypospadias. METHODS This study was carried out in the Department of Pediatric Surgery, The Children hospital, Pakistan Institute of Medical Sciences Islamabad, from March 2003 to Feb 2005. We managed 90 patients with primary ante...

Voice production models are used for speech compression thus reducing the encoding data rates and storage space for speech signaling processing. The legacy voice production model consists of a vocal source model and a vocal tract model. This paper presents a simpler voice production model adapted to waveform coding of speech: the Mathieu Waveform Coder (MWC) model. The MWC model yields weighted...

An extension is given for the standard two component model of adiabatic, Born-Oppenheimer (BO) electronic states in a polyatonic molecule, by use of Mathieu functions of arbitrary order. The curl or compatibility conditions for the construction of a diabatic set of states based on a finitedimensional subset of BO states are not satisfied exactly. It is shown, however, that, by successively addi...

Vangelis Th. PASCHOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Directeur de thèse Bruno ESCOFFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Co-Directeur de thèse Éric ANGEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

We propose two methods to find analytic periodic approximations intended for differential equations of Hill type. Here, we apply these methods on the simplest case of the Mathieu equation. The former has been inspired in the harmonic balance method and designed to find, making use on a given algebraic function, analytic approximations for the critical values and their corresponding periodic sol...

The Mathieu partial differential equation (PDE) is analyzed as a prototypical model for pattern formation due to parametric resonance. After averaging and scaling, it is shown to be a perturbed nonlinear Schrödinger equation (NLS). Adiabatic perturbation theory for solitons is applied to determine which solitons of the NLS survive the perturbation due to damping and parametric forcing. Numerica...