Publications

• Article dans une revue

Dielectric and Impedance spectroscopy characterizations of CuO added (Na0,5Bi0,5)0.94Ba0.06TiO3 lead-free piezoelectric ceramics

N. Zidi, Ahcène Chaouchi, Sophie d'Astorg, Mohamed Rguiti, Christian Courtois

CuO was used to reduce the sintering temperature of (Na0.5Bi0.5)0.94–Ba0.06TiO3 + 0.03 wt.%Sm2O3 (named NBTS) piezoelectric ceramics. Structural/micro-structural, dielectric, and resistive properties of this composition have been studied using impedance spectroscopic method to get better…

• Article dans une revue

Heteroclinics for non autonomous third order differential equations

Denis Bonheure, José Ángel Cid, Colette De Coster, Luís Sanchez

We study the existence of heteroclinics connecting the two equilibria $\pm1$ of the third order differential equation $$u'''=f(u)+p(t)u'$$ where $f$ is a continuous function such that $f(u)(u^2-1)> 0$ if $u\neq\pm1$ and $p$ is a bounded non negative function. Uniqueness is…

Topological Methods in Nonlinear Analysis, 2014, 43 (1), pp.53-68. ⟨10.12775/tmna.2014.004⟩. ⟨hal-03135614⟩

• Communication dans un congrès

Helmholtz Equation in Highly Heterogeneous Media: a two Scales Analysis

Hélène Barucq, Henri Calandra, Théophile Chaumont-Frelet, Christian Gout

Helmholtz Equation in Highly Heterogeneous Media: a two Scales Analysis

Third international workshop on multiphysics, multiscale and optimization problem, May 2014, Bilbao, Spain. ⟨hal-01100475⟩

• Pré-publication, Document de travail

Boundary feedback stabilization of a chain of serially connected strings

Kais Ammari, Denis Mercier

We consider N strings connected to one another and forming a particular network which is a chain of strings. We study a stabilization problem and precisley we prove that the energy of the solutions of the dissipative system decay exponentially to zero when the time tends to infinity, independently…

2014. ⟨hal-00998329v2⟩

• Article dans une revue

Development of Antibacterial Polyester Fabric by Growth of ZnO Nanorods

Munir Ashraf, Frédéric Dumont, Campagne Christine, Philippe Champagne, Anne Perwuelz, Anne Leriche, Nour-Eddine Chihib

ZnO nanorods were grown on polyester fabric by hydrothermal process. The seeding of fabric to grow ZnO nanorods was necessary because they did not grow without seeding. An air plasma treatment was carried out on polyester fabric to generate polar groups which could attach ZnO seeds. ZnO nanorods…

Journal of Engineered Fibers and Fabrics, 2014, 9 (1), ⟨10.1177/155892501400900103⟩. ⟨hal-03121204⟩

• Thèse

Numerical analysis of the stochastic volatility jump diffusion models, Analyse numérique de modèles de diffusion-sauts à volatilité stochastique

Abdelilah Jraifi

In the modern economic world, the options contracts are used because they allow to hedge against the vagaries and risks refers to fluctuations in the prices of the underlying assets. The determination of the price of these contracts is of great importance for investors.We are interested in problems…, Dans le monde économique, les contrats d'options sont très utilisés car ils permettent de se couvrir contre les aléas et les risques dus aux fluctuations des prix des actifs sous-jacents. La détermination du prix de ces contrats est d'une grande importance pour les investisseurs.Dans…

Statistics [math.ST]. Université de Valenciennes et du Hainaut-Cambrésis, 2014. English. ⟨NNT : 2014VALE0002⟩. ⟨tel-03356473⟩

• Article dans une revue

Microwave sintering of large size pieces with complex shape

Anthony Thuault, Etienne Savary, J. Bazin, S. Marinel

In this study, large size pieces of kaolin with a complex shape were successfully sintered in a microwave multimode cavity. The challenge was to obtain a sample homogeneously sintered on a large surface. For this purpose, prior to sintering, a finite element modelling study was carried out to…

Journal of Materials Processing Technology, 2014, 214 (2), pp.470-476. ⟨10.1016/j.jmatprotec.2013.09.030⟩. ⟨hal-02450337⟩

• Article dans une revue

Cohomological equations and invariant distributions on a compact Lie group

Aziz El Kacimi Alaoui, Hadda Hmili

This paper deals with two analytic questions on a connected compact Lie group G. i) Let a ε G and denote by γ the diffeomorphism of G given by γ (x) = ax (left translation by a). We give necessary and sufficient conditions for the existence of solutions of the cohomological equation f - fo γ = g on…

Hokkaido Mathematical Journal, 2014, 43 (2), pp.151-173. ⟨10.14492/hokmj/1404229920⟩. ⟨hal-03164536⟩

• Article dans une revue

Well-posedness and spectral properties of heat and wave equations with non-local conditions

Delio Mugnolo, Serge Nicaise

We consider the one-dimensional heat and wave equations but – instead of boundary conditions – we impose on the solution certain non-local, integral constraints. An appropriate Hilbert setting leads to an integration-by-parts formula in Sobolev spaces of negative order and eventually allows us to…

Journal of Differential Equations, 2014, 256 (7), pp.2115-2151. ⟨10.1016/j.jde.2013.12.016⟩. ⟨hal-03163703⟩

• Article dans une revue

Classical and Relaxor Ferroelectric Behavior of Titanate of Barium and Zirconium Ceramics

Amina Tachafine, A. Aoujgal, Mohamed Rguiti, M.P.F. Graca, L.C. Costa, Abdelkader Outzourhit, Jean-Claude Carru

BaZrxTi1-xO3 (BZT) (x = 0 to 1) and BaZr0.05Ti0.95-y(Zn1/3Nb2/3)yO3 (BZT(ZnNb)) (y = 0 to 0.1) ceramics were prepared by the conventional solid-solid reaction method. The structural, ferroelectric and dielectric properties of BZT ceramics were studied as well as the dielectric properties of the BZT…

Spectroscopy Letters : An International Journal for Rapid Communication, 2014, Special Issue: Fourth International Meeting on Dielectric Materials (IMDM'4) Marrakech, Morocco, May 29-31, 2013 Submit an article Journal homepage, 47 (5), pp.404-410. ⟨10.1080/00387010.2013.872664⟩. ⟨hal-03122804⟩