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Article dans une revue

Effect of Microwave Drying, Calcination and Aging of Pt/Al2O3 on Platinum Dispersion

Xavier Auvray, Anthony Thuault

The effect of heating method employed for drying and calcination during the synthesis of 1 wt% Pt/Al 2 O 3 catalyst was investigated. Conventional heating (CH) in resistive oven and microwave heating (MW) in single mode were applied, and the Pt dispersion and Brunauer-Emmett-Teller (BET) surface…

Catalysts, 2018, 8 (9), pp.348. ⟨10.3390/catal8090348⟩. ⟨hal-04281996⟩

Article dans une revue

Generalized harmonic morphisms and horizontally weakly conformal biharmonic maps

Elsa Ghandour, Ye-Lin Ou

Harmonic morphisms are maps between Riemannian manifolds that pull back harmonic functions to harmonic functions. These maps are characterized as horizontally weakly conformal harmonic maps and they have many interesting links and applications to several areas in mathematics (see the book [2] by…

Australian Journal of Mathematical Analysis and Applications, 2018, 464 (1), pp.924-938. ⟨10.1016/j.jmaa.2018.04.044⟩. ⟨hal-03149449⟩

Article dans une revue

Numerical optimization of cell colonization modelling inside scaffold for perfusion bioreactor: A multiscale model

T-K. Nguyen, Olivier Carpentier, Francine Monchau, F. Chai, Jean-Christophe Hornez, Ph. Hivart

Part of clinically applicable bone graft substitutes are developed by using mechanical stimulation of flow-perfusion into cell-seeded scaffolds. The role of fluid flow is crucial in driving the nutrient to seeded cells and in stimulating cell colonization. A common numerical approach is to use a…

Medical Engineering & Physics, 2018, 57, pp.40-50. ⟨10.1016/j.medengphy.2018.04.012⟩. ⟨hal-03080599⟩

Article dans une revue

New environmentally friendly coatings for hot forging tools

André Dubois, Mirentxu Dubar, Colin Debras, Kurt Hermange, Christelle Nivot, Christian Courtois

Two alumina coatings are developed to protect tool surface in hot forging: pure γ-alumina matrix loaded with α-alumina particles and pure γ-alumina matrix loaded with h-BN particles. The coatings are deposited on stainless tools by using a sol-gel procedure. Adherent coatings are obtained with an…

Surface and Coatings Technology, 2018, 344, pp.342-352. ⟨10.1016/j.surfcoat.2018.03.055⟩. ⟨hal-02909709⟩

Article dans une revue

Are calcium silicate hydrates (C-S-H) present in alkali-activated glass cullet cement?

Baptiste Marchand, S. Lanier, C. Davy, Cyrille Albert-Mercier, G. Tricot

This contribution analyzes the structure of sodium-lime-silica (SLS) glass alkali-activated with NaOH. The mix forms an alkali-activated cement (AAC), which has proven to be mechanically resistant when immerged under water. The aim is to determine whether the presence of calcium in the glass powder…

Materials Letters, 2018, 219, pp.104 - 108. ⟨10.1016/j.matlet.2018.02.046⟩. ⟨hal-01793442⟩

Article dans une revue

Existence and multiplicity for elliptic p-Laplacian problems with critical growth in the gradient

Colette De Coster, Antonio J. Fernández Sánchez

We consider the boundary value problem (Pλ) −∆pu = λc(x)|u| p−2u + µ(x)|∇u| p + h(x) , u ∈ W1,p 0 (Ω) ∩ L∞(Ω) , where Ω ⊂ RN , N ≥ 2, is a bounded domain with smooth boundary. We assume c, h ∈ Lq (Ω) for some q > max{N/p, 1} with c 0 and µ ∈ L∞(Ω). We prove existence and uniqueness results in…

Calculus of Variations and Partial Differential Equations, 2018, 57 (3), 42 p. ⟨10.1007/s00526-018-1346-6⟩. ⟨hal-03137670⟩

Article dans une revue

Regularity and a priori error analysis on anisotropic meshes of a Dirichlet problem in polyhedral domains

Hengguang Li, Serge Nicaise

Consider the Poisson equation on a polyhedral domain with the given data in a weighted L 2 space. We establish new regularity results for the solution with possible vertex and edge singularities and propose anisotropic finite element algorithms approximating the singular solution in the optimal…

Numerische Mathematik, 2018, 139 (1), pp.47-92. ⟨10.1007/s00211-017-0936-0⟩. ⟨hal-01956612⟩

Article dans une revue

Indirect stability of the wave equation with a dynamic boundary control

Denis Mercier, Serge Nicaise, Mohamad Ali Sammoury, Ali Wehbe

In this paper, we consider a damped wave equation with a dynamic boundary control. First, combining a general criteria of Arendt and Batty with Holmgren's theorem we show the strong stability of our system. Next, we show that our system is not uniformly stable in general, since it is the case…

Mathematical News / Mathematische Nachrichten, 2018, 291 (7), pp.1114-1146. ⟨10.1002/mana.201700021⟩. ⟨hal-01956619⟩

Article dans une revue

Density and trace results in generalized fractal networks

Serge Nicaise, Adrien Semin

The first aim of this paper is to give different necessary and sufficient conditions that guarantee the density of the set of compactly supported functions into the Sobolev space of order one in infinite p-adic weighted trees. The second goal is to define properly a trace operator in this Sobolev…

ESAIM: Mathematical Modelling and Numerical Analysis, 2018, 52 (3), pp.1023-1049. ⟨10.1051/m2an/2018021⟩. ⟨hal-01956605⟩

Article dans une revue

High-frequency behaviour of corner singularities in Helmholtz problems

Théophile Chaumont-Frelet, Serge Nicaise

We analyze the singular behaviour of the Helmholtz equation set in a non-convex polygon. Classically, the solution of the problem is split into a regular part and one singular function for each re-entrant corner. The originality of our work is that the " amplitude " of the singular parts…

ESAIM: Mathematical Modelling and Numerical Analysis, 2018, ⟨10.1051/m2an/2018031⟩. ⟨hal-01706415⟩