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Affichage de 541 à 550 sur 1058

Article dans une revue

Well-posedness and stability results for nonlinear abstract evolution equations with time delays

Serge Nicaise, Cristina Pignotti

We consider abstract evolution equations with a nonlinear term depending on the state and on delayed states. We show that, if the -semigroup describing the linear part of the model is exponentially stable, then the whole system retains this property under some Lipschitz continuity assumptions on...

Journal of Evolution Equations, 2018, 18 (2), pp.947-971. ⟨10.1007/s00028-018-0427-5⟩. ⟨hal-03166220⟩

Article dans une revue

Mechanical Properties, Structure, Bioactivity and Cytotoxicity of Bioactive Na-Ca-Si-P-O-(N) Glasses

Assia Mabrouk, Ahmed Bachar, Ali Atbir, Claudine Follet-Houttemane, Cyrille Albert-Mercier, Arnaud Tricoteaux, Anne Leriche, Stuart Hampshire

Bioactive glasses are able to bond to bone through formation of carbonated hydroxyapatite in body fluids. However, because of their poor strength their use is restricted to non-load-bearing applications. The effects of nitrogen addition on the physical and mechanical properties and structure of...

Journal of the mechanical behavior of biomedical materials, 2018, 86, pp.284-293. ⟨10.1016/j.jmbbm.2018.06.023⟩. ⟨hal-04351733⟩

Article dans une revue

Classification of δ(2,n − 2)-ideal Lagrangian submanifolds in n-dimensional complex space forms

Bang-Yen Chen, Franki Dillen, Joeri van Der Veken, Luc Vrancken

It was proven in [4] that every Lagrangian submanifold M of a complex space form M˜n(4c) of constant holomorphic sectional curvature 4c satisfies the following optimal inequality: δ(2,n−2)≤[Formula presented]H2+2(n−2)c, where H2 is the squared mean curvature and δ(2,n−2) is a δ-invariant on M. In...

Journal of Mathematical Analysis and Applications, 2018, 458 (2), pp.1456-1485. ⟨10.1016/j.jmaa.2017.10.044⟩. ⟨hal-03233923⟩

Article dans une revue

Finite element approximation of electromagnetic fields using nonfitting meshes for Geophysics

Théophile Chaumont-Frelet, Serge Nicaise, David Pardo

We analyze the use of non-fitting meshes for simulating the propagation of electromagnetic waves inside the Earth. In order to take into account subcell conductivity variations, we propose a simple " exact integration technique " that avoids the use of parameter homogenization and employs...

SIAM Journal on Numerical Analysis, 2018, 56 (4), pp.2288-2321. ⟨10.1137/16m1105566⟩. ⟨hal-01706452v2⟩

Article dans une revue

Study of novel oxyfluoronitride bioglasses

Assia Mabrouk, A. Marrouche, Claudine Follet-Houttemane, Ali Atbir, L. Boukir, Fouad Bentiss, A. Bachar

Bioglasses are used as bone substitutes and prosthetic coatings. Following implantation, they are predisposed to generate a series of physicochemical reactions at the glass-bone interface. Bioglasses with molar composition: 55SiO2–8.5CaO–31.5Na2O–5CaF2 have been synthesized and characterized....

Journal of Materials and Environmental Science , 2018, 9 (6), pp.1866-1874. ⟨hal-04351717⟩

Communication dans un congrès

Modéliser un demi-cercle et autres questions de poids nuls

Jean-Paul Becar, Laurent Fuchs, Lionel Garnier

Les courbes de Bézier rationnelles avec des points pondérés peinent à prendre en compte certaines situations élémentaires comme la modélisation d'un demi-cercle avec une courbe de degré 2. Dans cet article nous mon-trons comment l'utilisation de courbes de Bézier rationnelles avec des...

JFIG 18, Université de Poitiers, Nov 2018, POITIERS, France. ⟨hal-02508960⟩

Thèse

Élaboration d'une céramique dentaire par stéréolithographie, Development of a stereolithography-manufactured dental ceramic

Marion Dehurtevent

La stéréolithographie, technique additive de mise en forme couche par couche, permet de limiter les contraintes de l’usinage mais doit répondre aux exigences des normes dentaires en vigueur pour son utilisation clinique. L’effet de la formulation de différentes céramiques alumineuses mises en..., Stereolithography is a layer-by layer additive manufacturing method. It allows to reduce the strains that occur with milling methods. Its use for clinical purposes needs to follow dental material standards. The impact of slurry composition and the influence of layer orientation on mechanical and...

Matière Condensée [cond-mat]. Université de Valenciennes et du Hainaut-Cambrésis, 2017. Français. ⟨NNT : 2017VALE0036⟩. ⟨tel-03366023⟩

Article dans une revue

Bio-inspired hydroxyapatite dual core-shell structure for bone substitutes

Shaan Chamary, D. Hautcoeur, Jean-Christophe Hornez, Anne Leriche, Francis Cambier

A variety of processing methods has been developed and optimized to generate porous bio-ceramic structures close to that of the natural bone. Two different ceramic processing techniques were combined in order to generate a bio-inspired structure similar, in terms of composition and architecture, to...

Journal of the European Ceramic Society, 2017, 37 (16), pp.5321-5327. ⟨10.1016/j.jeurceramsoc.2017.05.043⟩. ⟨hal-03079738⟩

Article dans une revue

Spectral analysis of a generalized buckling problem on a ball

Colette de Coster, Serge Nicaise, Christophe Troestler

In this paper, the spectrum of the following fourth order problem Δ 2 u + νu = −λΔu in D 1 , u = ∂ r u = 0 o n∂ D 1 , where D 1 is the unit ball in R N , is determined for ν < 0 as well as the nodal properties of the corresponding eigenfunctions. In particular, we show that the first eigenvalue...

Positivity, 2017, 21 (4), pp.1319-1340. ⟨10.1007/s11117-017-0469-x⟩. ⟨hal-01956618⟩

Article dans une revue

Influence of post-HIP temperature on microstructural and optical properties of pure MgAl2O4 spinel

Caroline Gajdowski, Judith Böhmler, Yannick Lorgouilloux, Sébastien Lemonnier, Sophie d'Astorg, Elodie Barraud, Anne Leriche

Transparent MgAl2O4 spinel ceramics were processed from sub-micrometric commercial powder by applying a two-step procedure: pressureless sintering under vacuum followed by hot isostatic pressing. To limit grain growth and to avoid secondary reactions or impurities, no additives or sintering aids...

Journal of the European Ceramic Society, 2017, 37 (16), pp.5347-5351. ⟨10.1016/j.jeurceramsoc.2017.07.031⟩. ⟨hal-03080454⟩