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Article dans une revue

Modification of hydroxyapatite surface properties by electron irradiation

Guillaume Bai, Jean-Christophe Hornez, Ulrich Maschke, Philippe Supiot, Etienne Bres

In the present work, the modification of wetting properties of EB irradiated HA ceramics are studied under air and N2 gas atmospheres. We show a noticeable increase of the hydrophily of electron irradiated HA ceramics in an air atmosphere and a lesser increase when the samples are irradiated in an…

Radiation Physics and Chemistry, 2020, Radiation Physics and Chemistry, 177, pp.109192. ⟨10.1016/j.radphyschem.2020.109192⟩. ⟨hal-03104388⟩

Article dans une revue

Hyperbolic Radial Spanning Tree

Lucas Flammant

We define and analyze an extention to the d-dimensional hyperbolic space of the Radial Spanning Tree (RST) introduced by Baccelli and Bordenave in the two-dimensional Euclidean space (2007). In particular, we will focus on the description of the infinite branches of the tree. The properties shown…

Electronic Journal of Probability, 2020. ⟨hal-03024280⟩

Article dans une revue

Impedance spectroscopy analysis and piezoelectric properties of (Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 + 0.3wt.% Sm 2 O 3 lead-free ceramics sintered at different conditions

Sadia Kennour, Nouara Lamrani-Amaouz, Ahcène Chaouchi, Mohamed Rguiti, Yannick Lorgouilloux, Christian Courtois

(Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt.% Sm2O3 (named NBT-BT) lead-free piezoelectric ceramics were prepared by normal sintering. The effect of atmosphere sintering on NBT-BT ceramics was investigated through X-ray diffraction, dielectric, ferroelectric and piezoelectric characterizations. Real (Z′)…

Ferroelectrics, 2020, 568 (1), pp.5-22. ⟨10.1080/00150193.2020.1811027⟩. ⟨hal-03480198⟩

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On product affine hyperspheres in ℝn+1

Xiuxiu Cheng, Zejun Hu, Marilena Moruz, Luc Vrancken

In this paper, we study locally strongly convex affine hyperspheres in the unimodular affine space ℝn+1 which, as Riemannian manifolds, are locally isometric to the Riemannian product of two Riemannian manifolds both possessing constant sectional curvature. As the main result, a complete…

Science China Mathematics, 2020, 63 (10), pp.2055-2078. ⟨10.1007/s11425-018-9457-9⟩. ⟨hal-03722937⟩

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Nonlinear fractional Laplacian problems with nonlocal ‘gradient terms’

Boumediene Abdellaoui, Antonio J. Fernández Sánchez

Abstract Let $\Omega \subset \mathbb{R}^{N} $ , N ≽ 2, be a smooth bounded domain. For s ∈ (1/2, 1), we consider a problem of the form $$\left\{\begin{array}{@{}ll} (-\Delta)^s u = \mu(x)\, \mathbb{D}_s^{2}(u) + \lambda f(x), & {\rm in}\,\Omega, \\ u= 0, & {\rm in}\,\mathbb{R}^{N} \setminus…

Proceedings of the Royal Society of Edinburgh: Section A, Mathematics, 2020, 150 (5), pp.2682-2718. ⟨10.1017/prm.2019.60⟩. ⟨hal-03337289⟩

Article dans une revue

Existence, Uniqueness and Stabilization of Solutions of a Generalized Telegraph Equation on Star Shaped Networks

Alaa Hayek, Serge Nicaise, Zaynab Salloum, Ali Wehbe

The existence, uniqueness, strong and exponential stability of a generalized telegraph equation set on one dimensional star shaped networks are established. It is assumed that a dissipative boundary condition is applied at all the external vertices and an improved Kirchhoff law at the common…

Acta Applicandae Mathematicae, 2020, 170 (1), pp.823-851. ⟨10.1007/s10440-020-00360-8⟩. ⟨hal-04304997⟩

Article dans une revue

Almost complex submanifolds of nearly Kähler manifolds

Limiao Lin, Luc Vrancken, Anne Wijffels

We study almost complex submanifolds of pseudo nearly Kähler manifolds. We show in particular that a 6 dimensional strict nearly Kähler manifold does not admit any 4 dimensional almost complex submanifolds. This generalises results obtained by Gray (Proc Am Math Soc 20:277–279, 1969) for the nearly…

Archiv der Mathematik, 2020, 115 (3), pp.353-358. ⟨10.1007/s00013-020-01469-w⟩. ⟨hal-03722951⟩

Article dans une revue

A Localized Phage-Based Antimicrobial System: Effect of Alginate on Phage Desorption from β-TCP Ceramic Bone Substitutes

Rached Ismail, Natalia Dorighello Carareto, Jean-Christophe Hornez, Franck Bouchart

Tricalcium phosphate (TCP) is a prosthetic material commonly used as a bone substitute to repair osteoarticular diseases and injuries. In this type of bone reconstruction surgery, antibiotics remain the common preventive and therapeutic treatment for bacterial infection. Nevertheless, the emergence…

Antibiotics, 2020, 9, pp.560. ⟨10.3390/antibiotics9090560⟩. ⟨hal-04279743⟩

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Improvement in energy conversion of electrostrictive composite materials by new approach via piezoelectric effect: Modeling and experiments

Rida Farhan, Adil Eddiai, Mounir Meddad, Nabil Chakhchaoui, Mohamed Rguiti, M'Hammed Mazroui

This study proposes a new model that couples the piezoelectric and electrostrictive behavior to minimize the polarization power of composite polymer. The development of this model is capable to predict the energy harvesting abilities of an electrostrictive composite. To improve the dielectric…

Polymers for Advanced Technologies, 2020, 32 (1), pp.123-130. ⟨10.1002/pat.5066⟩. ⟨hal-04280942⟩

Article dans une revue

2-D Modeling of Rosen-Type Piezoelectric Transformer by Means of a Polynomial Approach

Derandraibe Jeannot Falimiaramanana, Faniry Emilson Ratolojanahary, Jean-Etienne Lefebvre, Lahoucine El Maimouni, Mohamed Rguiti

A 2-D semianalytical model using the Legendre polynomial approach was applied for modeling the piezoelectric transformer (PT). In the model, the mechanical displacements and the electric potential were expanded in a double series of orthonormal polynomials with an appropriate analytical form.…

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2020, 67 (8), pp.1701-1714. ⟨10.1109/TUFFC.2020.2975647⟩. ⟨hal-03480267⟩