Publications

• Article dans une revue

A classification of isotropic affine hyperspheres

Marilena Moruz, Luc Vrancken

We study affine hypersurfaces M, which have isotropic difference tensor. Note that, any surface always has isotropic difference tensor. In case that the metric is positive definite, such hypersurfaces have been previously studied in [O. Birembaux and M. Djoric, Isotropic affine spheres, Acta Math.…

International Journal of Mathematics, 2016, 27 (9), pp.1650074. ⟨10.1142/S0129167X16500749⟩. ⟨hal-03173175⟩

• Article dans une revue

PU/PZT composites for vibratory energy harvesting

S. Touhtouh, Mohamed Rguiti, Christian Courtois, F. Belhora, A. Arbaoui, Sophie d'Astorg, A. Rachek, A. Hajjaji

Piezoelectric composites of PU/PZT with 0–3 connectivity were prepared in the film form. Homogeneous dispersion of the ceramic PZT in polyurethane matrix has been obtained and has been verified by SEM analysis. Dielectric properties reveal that under an electrical field of 1000 V the remnant…

Optical and Quantum Electronics, 2016, 48 (4), ⟨10.1007/s11082-016-0518-x⟩. ⟨hal-01769134⟩

• Article dans une revue

Complete Lagrangian ideal δ(2) submanifolds in the complex projective space : recent advances in the geometry of submanifolds – dedicated to the memory of Franki DILLEN (1963–2013)

Luc Vrancken

In the 1990s B.Y. Chen introduced a sequence of curvature invariants, constructed using appropriate sectional curvatures of the manifold. Each of these invariants is used to obtain an optimal lower bound for the length of the mean curvature vector for an immersion in a real space form. This upper…

• Article dans une revue

Residual-based a posteriori estimators for the potential formulations of electrostatic and time-harmonic eddy current problems with voltage or current excitation

Chao Chen, Emmanuel Creusé, Serge Nicaise, Zuqi Tang

In this paper, we present some residual-based a posteriori estimators for the potential formulations of electrostatic and time-harmonic eddy current problems with voltage or current excitation. The reliability of the proposed estimators is proved and some numerical experiments are carried out to…

International Journal for Numerical Methods in Engineering, 2016, 107 (5), pp.377-394 ⟨10.1002/nme.5168⟩. ⟨hal-01390241⟩

• Article dans une revue

Minimal translation hypersurfaces in E4

Marilena Moruz, Marian Ioan Munteanu

In this paper we consider hypersurfaces in the Euclidean space E4 defined as the sum of a curve and a surface whose mean curvature vanishes. We call them minimal translation hypersurfaces in E4 and give a classification of these hypersurfaces.

Journal of Mathematical Analysis and Applications, 2016, 439 (2), pp.798-812. ⟨10.1016/j.jmaa.2016.02.077⟩. ⟨hal-03187545⟩

• Communication dans un congrès

Espace de Minkowski-Lorentz et des sphères : un état de l'art

Jean-Paul Becar, Lucie Druoton, Laurent Fuchs, Lionel Garnier, Rémi Langevin, Géraldine Morin

Dans cet article, nous faisons une présentation de l'espace de Minkowski-Lorentz généralisant, à Ê 5 l'espace utilisé dans la théorie de la relativité. Cet espace de dimension 5 contient un paraboloïde de dimension 3 et isométrique à l'espace affine euclidien usuel E 3 , l'…

GTMG 2016, Mar 2016, DIJON, France. ⟨hal-02508285⟩

• Communication dans un congrès

COMPUTER AIDED TEACHINGS SYSTEMS

Jean-Paul Becar, Jean-Charles Canonne, Marika Seppälä, Alain Mayeur

• Communication dans un congrès

A guaranteed equilibrated error estimator for the harmonic A — φ formulation in eddy current problems

Roberta Tittarelli, Yvonnick Le Menach, Francis Piriou, Emmanuel Creusé, Serge Nicaise, Jean-Pierre Ducreux

IEEE Conference on Electromagnetic Field Computation, 2016, Miami, United States. ⟨hal-03166375⟩

• Article dans une revue

Residual-based a posteriori error estimates for a nonconforming finite element discretization of the Stokes–Darcy coupled problem: isotropic discretization

Serge Nicaise, Bernardin Ahounou, Wilfrid Koffi Houedanou

In this paper we develop an a posteriori error analysis of a nonconforming mixed finite element method for the coupling of fluid flow with porous media flow. The approach utilizes the same nonconforming Crouzeix–Raviart element discretization on the entire domain (Rui and Zhang, Comput Methods Appl…

Afrika Matematika, 2016, 27 (3), pp.701-729. ⟨10.1007/s13370-015-0370-3⟩. ⟨hal-03158714⟩

• Article dans une revue

Electrical, dielectric and photocatalytic properties of Fe-doped ZnO nanomaterials synthesized by sol gel method

Yacine Cherifi, Ahcène Chaouchi, Yannick Lorgouilloux, Mohamed Rguiti, Abdelaziz Kadri, Christian Courtois

Fe-doped ZnO nanoparticles were synthesized by sol gel technique. Fine-scale and single phase hexagonal wurtzite structure in all samples were confirmed by SEM and XRD, respectively. The band gap energy depends on the amount of Fe and was found to be in the range of 3.11–2.53 eV. The electric and…

Processing and Application of Ceramics, 2016, 10 (3), pp.125-135. ⟨10.2298/PAC1603125C⟩. ⟨hal-03120131⟩