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Sintering of Ceramics: An Overview

Anne Leriche, Francis Cambier, Stuart Hampshire

This article gives an overview of surface and bulk matter transport processes occurring during the densification of ceramic powder compacts. Starting from purified or chemically synthesized raw materials, sintering takes place by either solid state or liquid phase mechanisms during heat treatment…

Encyclopedia of Materials: Technical Ceramics and Glasses, 2021, pp.233-248. ⟨10.1016/B978-0-12-803581-8.12083-1⟩. ⟨hal-04475174⟩

Article dans une revue

Adaptation in a heterogeneous environment. I: Persistence versus extinction

François Hamel, Florian Lavigne, Lionel Roques

Understanding how a diversity of plants in agroecosystems affects the adaptation of pathogens is a key issue in agroecology. We analyze PDE systems describing the dynamics of adaptation of two phenotypically structured populations, under the effects of mutation, selection and migration in a two-…

Journal of Mathematical Biology, 2021, 83 (2), pp.14. ⟨10.1007/s00285-021-01637-8⟩. ⟨hal-02612415v2⟩

Article dans une revue

Every centroaffine Tchebychev hyperovaloid is ellipsoid

Xiuxiu Cheng, Zejun Hu, Luc Vrancken

We study locally strongly convex Tchebychev hypersurfaces, namely the centroaffine totally umbilical hypersurfaces, in the (n+1)-dimensional affine space Rn+1. We first make an ordinary-looking observation that such hypersurfaces are characterized by having a Riemannian structure admitting a…

Pacific Journal of Mathematics, 2021, 315 (1), pp.27-44. ⟨10.2140/pjm.2021.315.27⟩. ⟨hal-03722505⟩

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Overview of Substitutes for Bone Replacement: Natural and Synthetic Products

Nicolas Somers, Marie Lasgorceix

This review provides an overview of materials from natural and synthetic origin, specifically in the field of bioceramics and bioglasses, applied to bone substitution. The different developmental approaches currently considered to improve the biological performance of these bone implants, mainly…

Encyclopedia of Materials: Technical Ceramics and Glasses, 2021, pp.473-492. ⟨10.1016/b978-0-12-818542-1.00052-7⟩. ⟨hal-03889933⟩

Article dans une revue

On a class of recursive estimators for spatially dependent observations

Mohamed El Machkouri, Lucas Reding

We investigate the mean squared error and the asymptotic normality for a class of recursive kernel estimators based on a sample of spatially dependent observations. Our main result provides sufficient conditions for a spatial version of a recursive estimator introduced by Hall and Patil (1994) to…

Electronic Journal of Statistics , 2021, 15 (2), ⟨10.1214/21-ejs1878⟩. ⟨hal-04368133⟩

Article dans une revue

Under pressure! Nudging electricity consumption within firms. Feedback from a field experiment

Christophe Charlier, Gilles Guerassimoff, Ankinée Kirakozian, Sandrine Selosse

Many economists and psychologists have studied the impact of nudges on households' pro-environmental behaviors. Interestingly, "private nudges'' can be imagined for companies. Yet, studies focusing on nudging employees' energy use are rare. The objective of our paper is to…

Energy Journal, 2021, 42 (1). ⟨hal-02526322⟩

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Zirconia ceramics, structure and properties

Anne Leriche, Francis Cambier, Helen Reveron

This article gives an introductory review on zirconia by describing its crystallographic, physical and chemical properties. Developed since the 1980s following the discovery of stabilization at room temperature of its high temperature phases, zirconia has continued to fascinate scientists and…

Encyclopedia of Materials: Technical Ceramics and Glasses, 2021, pp.93-104. ⟨10.1016/B978-0-12-818542-1.00101-6⟩. ⟨hal-04475193⟩

Article dans une revue

Bone-like ceramic scaffolds designed with bioinspired porosity induce a different stem cell response

Silvia Panseri, Monica Montesi, Dominique Hautcoeur, Samuele Dozio, Shaan Chamary, Eamonn de Barra, Anna Tampieri, Anne Leriche

Abstract Biomaterial science increasingly seeks more biomimetic scaffolds that functionally augment the native bone tissue. In this paper, a new concept of a structural scaffold design is presented where the physiological multi-scale architecture is fully incorporated in a single-scaffold solution…

Journal of Materials Science: Materials in Medicine, 2021, 32 (1), ⟨10.1007/s10856-020-06486-3⟩. ⟨hal-03480401⟩

Article dans une revue

MULTIPLE BOUNDED VARIATION SOLUTIONS FOR A PRESCRIBED MEAN CURVATURE EQUATION WITH NEUMANN BOUNDARY CONDITIONS

Alberto Boscaggin, Francesca Colasuonno, Colette De Coster

We prove the existence of multiple positive BV-solutions of the Neumann problem - (u'/\sqrt{1+{u'}^2})' = a(x)f (u) in (0, 1), u (0) = u (1) = 0, where a(x) > 0 and f belongs to a class of nonlinear functions whose prototype example is given by f (u) = −λu + u^p, for λ > 0 and…

Journal of Differential Equations, 2021, 285, pp.607-639. ⟨10.1016/j.jde.2021.03.021⟩. ⟨hal-03721320⟩

Notice d’encyclopédie ou de dictionnaire

Control of the Microstructure in Ceramics

Anne Leriche, Stuart Hampshire, Francis Cambier

Ceramic materials are commonly fabricated by powder processing and a subsequent heat treatment, which results in the elimination of about 40 vol% of porosity during the sintering step. The densification occurs at high temperature allowing atom diffusion in the solid state or through a liquid phase…

Encyclopedia of Materials: Technical Ceramics and Glasses, 2021, pp.349-366. ⟨10.1016/B978-0-12-818542-1.00017-5⟩. ⟨hal-04474300⟩