Publications

• Article dans une revue

Classes réalisables d'extensions non abéliennes de degré p3

Maya Farhat, Bouchaïb Sodaïgui

Soient k un corps de nombres et Ok son anneau d'entiers. Soit p un nombre premier impair. Soit Γ un groupe non abélien d'ordre p3. Soient M un Ok-ordre maximal dans l'algèbre semi-simple k[Γ] contenant Ok[Γ], et Cl(M) le groupe des classes des M-modules localement libres. On définit…, Let k be a number field and its ring of integers. Let p be an odd prime number. Let Γ be a non-abelian group of order . Let be a maximal -order in the semi-simple algebra containing , and let be its locally free classgroup. We define the set of realizable classes to be the set of classes such that…

Journal of Number Theory, 2015, 152, pp.55-89. ⟨10.1016/j.jnt.2014.12.010⟩. ⟨hal-03149637⟩

• Article dans une revue

A Comparison of 1D Analytical Model and 3D Finite Element Analysis with Experiments for a Rosen-Type Piezoelectric Transformer

Faiza Boukazouha, Guylaine Poulin-Vittrant, Louis Pascal Tran-Huu-Hue, Maxime Bavencoffe, F. Boubenider, Mohamed Rguiti, Marc Lethiecq

This article is dedicated to the study of Piezoelectric Transformers (PTs), which offer promising solutions to the increasing need for integrated power electronics modules within autonomous systems. The advantages offered by such transformers include: immunity to electromagnetic disturbances; ease…

Ultrasonics, 2015, 60, pp.41-50. ⟨10.1016/j.ultras.2015.02.008⟩. ⟨hal-01814877⟩

• Pré-publication, Document de travail

Non uniform stability for the Timoshenko beam with tip load

Denis Mercier, Virginie Régnier

In this paper we consider a hybrid elastic model consisting of a Timoshenko beam and a tip load at the free end of the beam. Under the equal speed wave propagation condition, we show polynomial decay for the model which includes the rotary inertia of the tip load when feedback boundary moment and…

2015. ⟨hal-01170359⟩

• Article dans une revue

Crystal structure of alluaudite-type NaMg3(HPO4)2(PO4)

Ahmed Ould Saleck, Abderrazzak Assani, Mohamed Saadi, Cyrille Albert-Mercier, Claudine Follet-Houttemane, Lahcen El Ammari

The title compound, sodium trimagnesium bis­(hydrogen phosphate) phosphate, was obtained under hydro­thermal conditions. In the crystal, two types of [MgO6] octa­hedra, one with point group symmetry 2, share edges to build chains extending parallel to [10-1]. These chains are linked together by two…

Acta crystallographica Section E : Crystallographic communications [2015-..], 2015, 71 (7), pp.813-815. ⟨10.1107/S205698901501155X⟩. ⟨hal-03116322⟩

• Thèse

Régularité des solutions de problèmes elliptiques ou paraboliques avec des données sous forme de mesure, Regularity of the solutions of elliptic or parabolic problems with data measure

Sadjiya Ariche

Dans cette thèse on étudie la régularité de problèmes elliptiques (Laplace, Helmholtz) ou paraboliques (équation de la chaleur) avec donnée mesure dans divers cadres géométriques. Ainsi, on considère pour les seconds membres des masses de Dirac en un point, sur une ligne infinie, semi-infinie ou…, In this thesis, we study the regularity of elliptic problems (Laplace, Helmholtz) or parabolic problems (heat equation) with measure data in different geometric frames. Thus, we consider for the second members, Dirac masses at a point, on a line, on a half-line, or on a bounded segment, and also on…

Equations aux dérivées partielles [math.AP]. Université de Valenciennes et du Hainaut-Cambresis, 2015. Français. ⟨NNT : 2015VALE0015⟩. ⟨tel-01233940⟩

• Communication dans un congrès

Algebraic-Trigonometric Pythagorean Hodograph (ATPH) curves for solving planar and spatial interpolation problems

Cindy González

14th Meeting on Applied Scientific Computing and Tools, Jun 2015, Rome, Italy. ⟨hal-03155696⟩

• Article dans une revue

Impedance spectroscopy studies on (Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt% Sm2O3 + 0.25 wt% LiF lead-free piezoelectric ceramics

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

The a.c. complex impedance spectroscopy technique was used to obtain the electrical parameters of (Na0.5Bi0.5)0.94Ba0.06TiO3 +0.3 wt% Sm2O3 +0.25 wt% LiF lead-free ceramics in a wide frequency range at different temperatures. These samples were prepared by a high-temperature solid-state reaction…

Bulletin of Materials Science, 2015, 38 (3), pp.731-737. ⟨10.1007/s12034-015-0888-x⟩. ⟨hal-03039132⟩

• Article dans une revue

On some curvature conditions of pseudosymmetry type

Ryszard Deszcz, Małgorzata Głogowska, Marian Hotloś, Georges Zafindratafa

It is known that the difference tensor R⋅C−C⋅R and the Tachibana tensor Q(S,C) of any semi-Riemannian Einstein manifold (M,g) of dimension n≥4 are linearly dependent at every point of M. More precisely R⋅C−C⋅R=(1/(n−1))Q(S,C) holds on M. In the paper we show that there are quasi-Einstein, as well…

Periodica Mathematica Hungarica, 2015, 70 (2), pp.153-170. ⟨10.1007/s10998-014-0081-9⟩. ⟨hal-03146519⟩

• Article dans une revue

A new characterization of the Berger sphere in complex projective space

Haizhong Li, Luc Vrancken, Xianfeng Wang

We give a complete classification of Lagrangian immersions of homogeneous 3-manifolds (the Berger spheres, the Heisenberg group Nil3, the universal covering of the Lie group PSL(2,R) and the Lie group Sol3) in 3-dimensional complex space forms. As a corollary, we get a new characterization of the…

Journal of Geometry and Physics, 2015, 92, pp.129-139. ⟨10.1016/j.geomphys.2015.02.009⟩. ⟨hal-03172969⟩

• Article dans une revue

Solving the biharmonic Dirichlet problem on domains with corners

Colette De Coster, Serge Nicaise, Guido Sweers

The biharmonic Dirichlet boundary value problem on a bounded domain is the focus of the present paper. By Riesz’ representation theorem the existence and uniqueness of a weak solution is quite direct. The problem that we are interested in appears when one is looking for constructive approximations…

Mathematical News / Mathematische Nachrichten, 2015, 288 (8-9), pp.854-871. ⟨10.1002/mana.201400022⟩. ⟨hal-03142424⟩