Publications

• Article dans une revue

Fabrication and characterization of metal core piezoelectric fibres by dip coating process

Aurélien Dolay, Christian Courtois, Sophie d'Astorg, Mohamed Rguiti, J-L. Petiniot, Anne Leriche

Metal core piezoelectric fibres (MCPFs) show strong potential for structural actuator applications. Unfortunately the development of such fibres is problematic because of their fabrication difficulties. In order to obtain the best properties, both aspect ratio and piezoceramic–metal core…

Journal of the European Ceramic Society, 2014, 34 (12), pp.2951-2957. ⟨10.1016/j.jeurceramsoc.2014.04.035⟩. ⟨hal-03033364⟩

• Poster de conférence

High Order Methods for Helmholtz Problems in Highly Heterogeneous Media

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

This poster gives an overview of a multiscale approximation medium stragegy for high order discretization of heterogeneous Helmholtz problems.

Journées Total-Mathias 2014, Oct 2014, Paris, France. ⟨hal-01100468⟩

• Article dans une revue

Translation and homothetical surfaces in Euclidean space with constant curvature

Rafael Lopez, Marilena Moruz

We study surfaces in Euclidean space which are obtained as the sum of two curves or that are graphs of the product of two functions. We consider the problem of finding all these surfaces with constant Gauss curvature. We extend the results to non-degenerate surfaces in Lorentz-Minkowski space.

Journal of the Korean Mathematical Society, 2014, 52 (3), pp.523-535. ⟨10.4134/JKMS.2015.52.3.523⟩. ⟨hal-03172983⟩

• Ouvrages

Introduction à quelques problèmes d'EDP

Colette De Coster, Serge Nicaise

Le groupe de travail de l'équipe «EDP» du Lamav (Laboratoire de Mathématiques et leurs Applications de Valenciennes) a démarré en octobre 2009. Le présent manuscrit rassemble des notes d'exposés de certains membres. Ces notes visent un public assez large qui va des doctorants, des post-…

Ed. Universitaires Européennes, 200 p., 2014, 978-613-1-50683-3. ⟨hal-03142445⟩

• Communication dans un congrès

Planar C2 Algebraic-Trigonometric Pythagorean Hodograph spline curves

Cindy González

First International Conference onSubdivision, Geometric and Algebraic Methods, Isogeometric Analysis and Refinability in Tuscany, Sep 2014, Pontignano, Italy. ⟨hal-03155692⟩

• Communication dans un congrès

Mode of action of LiF during the development of YAG transparent ceramics by Spark Plasma Sintering (SPS)

Aurelien Katz, Elodie Barraud, Sébastien Lemonnier, Sophie d'Astorg, Anne Leriche

The replacement of single crystals like Er3+:Y3Al5O12 (Er:YAG) by polycrystalline ceramics is one of the ways to increase the output power of lasers sources. Although their low thermal conductivity could limit the overheating phenomenon that appears in the bulk material, their use is still limited…

Euro PM2014 Congress & Exhibition, Sep 2014, Salzburg, Australia. ⟨hal-03123125⟩

• Article dans une revue

Effects of microwave sintering on intrinsic defects concentrations in ZnO-based varistors

Faical Kharchouche, Etienne Savary, Anthony Thuault, Sylvain Marinel, Sophie d'Astorg, Mohamed Rguiti, Saâd Belkhiat, Christian Courtois, Anne Leriche

Nowadays the most important part of varistors is made from doped ZnO. The typical varistor microstructure consists in a large number of n–p–n junctions. ZnO grains are intrinsic n-type semiconductors because of the displacement of zinc atoms in interstitial positions and the formation of oxygen…

Ceramics International, 2014, 40 (8), pp.13697-13701. ⟨10.1016/j.ceramint.2014.04.142⟩. ⟨hal-02449721⟩

• Communication dans un congrès

Helmholtz Equation in Highly Heterogeneous Media

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

Helmholtz Equation in Highly Heterogeneous Media

Second Russian-French Workshop "Computational Geophysics", Sep 2014, Novosibirsk, Russia. ⟨hal-01100478⟩

• Article dans une revue

Stability results for second-order evolution equations with switching time-delay

Serge Nicaise, Cristina Pignotti

We consider second-order evolution equations in an abstract setting with intermittently delayed/not-delayed damping. We give sufficient conditions for asymptotic and exponential stability, improving and generalizing our previous results from Nicaise and Pignotti (Adv Differ Equ 17:879-902, 2012).…

Journal of Dynamics and Differential Equations, 2014, 26 (3), pp.781-803. ⟨10.1007/s10884-014-9382-1⟩. ⟨hal-03166065⟩

• Pré-publication, Document de travail

Remark on stabilization of second order evolution equations by unbounded dynamic feedbacks and applications

Zainab Abbas, Kais Ammari, Denis Mercier

In this paper we consider second order evolution equations with unbounded dynamic feedbacks. Under a regularity assumption we show that observability properties for the undamped problem imply decay estimates for the damped problem. We consider both uniform and non uniform decay properties.

2014. ⟨hal-01022854⟩