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Article dans une revue

Influence of microwave sintering on electrical properties of BCTZ lead free piezoelectric ceramics

Kelly Orlik, Yannick Lorgouilloux, Pascal Marchet, Anthony Thuault, Mohamed Rguiti, Christian Courtois, Florian Jean

Barium titanate doped with calcium and zirconium (BCTZ) could be used at low temperature to replace lead based piezoelectric ceramics (PZT). The classical way to obtain BCTZ is the solid-state route coupled with conventional sintering, but this step is time-consuming. To reduce the duration of this…

Journal of the European Ceramic Society, 2020, 40 (4), pp.1212-1216. ⟨10.1016/j.jeurceramsoc.2019.12.010⟩. ⟨hal-02550924⟩

Article dans une revue

Characterization and extensive study of cubic and quintic algebraic trigonometric planar PH curves, Caractérisation et étude approfondie des courbes planes algébriques-trigonométriques à hodographe pythagorien

Isabelle Cattiaux-Huillard, Laura Saini

This paper deals with Pythagorean hodograph curves of the spaces of algebraic trigonometric functions and trigonometric polynomials, span {1, t, {cos (kt) , sin (kt)}k=1^m and span {1, {cos (kt) , sin (kt)}k=1^m , respectively. First, we propose a general characterization of planar PH curves in…

Advances in Computational Mathematics, 2020, 46, ⟨10.1007/s10444-020-09772-4⟩. ⟨hal-04291439⟩

Article dans une revue

Sintering of BaTiO3 powder/sol composite thick films and their dielectric and piezoelectric properties

Jean-François Trelcat, Natanaël Basile, Maurice Gonon, Mohamed Rguiti, Christian Courtois, Anne Leriche

In this work, barium titanate thick films are produced at low-temperature using a modified sol–gel/ceramic powder technology named the composite route. In this process, a commercial BaTiO3 powder, doped or not by Li2O as sintering aid, is mixed with a stabilized titanium (IV) isopropoxide/barium…

Journal of Sol-Gel Science and Technology, 2020, 93 (3), pp.657-665. ⟨10.1007/s10971-019-05123-y⟩. ⟨hal-03479310⟩

Article dans une revue

Weighted-$L^2$ polynomial approximation in $\mathbb {C}$

Séverine Biard, John Erik Fornæss, Jujie Wu

We study the density of polynomials in H2(Ω, e−φ), the space of square integrable holomorphic functions in a bounded domain Ω in C, where φ is a subharmonic function. In particular, we prove that the density holds in Carath´eodory domains for any subharmonic function φ in a neighborhood of Ω. In…

Transactions of the American Mathematical Society, 2020, 373 (2), pp.919-938. ⟨10.1090/tran/7935⟩. ⟨hal-03207780⟩

Article dans une revue

Mechanical properties of thermally sprayed porous alumina coating by Vickers and Knoop indentation

Ghailen Ben Ghorbal, Arnaud Tricoteaux, Anthony Thuault, H. Ageorges, F. Roudet, D. Chicot

Depending on the thermal spraying conditions, coatings obtained can present different defects, like pores, cracks and/or unmelted particles, and different surface roughnesses, that can affect the determination of the hardness and elastic modulus. The present work investigates the mechanical…

Ceramics International, 2020, 46 (12), pp.19843-19851. ⟨10.1016/j.ceramint.2020.05.039⟩. ⟨hal-02937709⟩

Article dans une revue

Synthesis, crystal structure and magnetic behavior of a new calcium magnesium and iron orthophosphate Ca2MgFe2(PO4)4

Ahmed Ould Saleck, Cyrille Albert-Mercier, Claudine Follet-Houttemane, Olivier Mentré, Abderrazzak Assani, M. Saadi, L. El Ammari

The structure of the new calcium magnesium iron orthophosphate, Ca2MgFe2(PO4)4 was determined from single crystal X-ray diffraction data. It crystallizes in the orthorhombic system, space group Pbca, with all atoms in general positions among which two sites are disordered. The crystal structure of…

Journal of Solid State Chemistry, 2020, 292, pp.121715. ⟨10.1016/j.jssc.2020.121715⟩. ⟨hal-03094584⟩

Article dans une revue

Qualitative analysis of a curvature equation modeling MEMS with vertical loads

Chiara Corsato, Colette De Coster, Franco Obersnel, Pierpaolo Omari

We investigate existence, multiplicity and qualitative properties of the solutions of the Dirichlet problem for the singularly perturbed prescribed mean curvature equation - (1 - bu) div(\frac{\nabla u}{\sqrt{1 + |\nabla u|^2}}\Big) = frac{a}{(u-R)^2} +\frac{b}{\sqrt{1 + |\nabla u|^2}}, in \Omega,…

Nonlinear Analysis: Real World Applications, 2020, 55, pp.103123. ⟨10.1016/j.nonrwa.2020.103123⟩. ⟨hal-03721631⟩

Article dans une revue

Nonexistence of Levi flat hypersurfaces with positive normal bundle in compact Kähler manifolds of dimension ≥3

Séverine Biard, Andrei Iordan

Let [Formula: see text] be a compact connected Kähler manifold of dimension [Formula: see text] and [Formula: see text] a [Formula: see text] Levi flat hypersurface in [Formula: see text]. Then the normal bundle to the Levi foliation does not admit a Hermitian metric with positive curvature along…

International Journal of Mathematics, 2020, 31 (01), pp.2050004. ⟨10.1142/S0129167X20500044⟩. ⟨hal-02985883⟩

Article dans une revue

A combined finite volume - finite element scheme for a low-Mach system involving a Joule term

Caterina Calgaro, Claire Colin, Emmanuel Creusé

In this paper, we propose a combined finite volume-finite element scheme, for the resolution of a specific low-Mach model expressed in the velocity, pressure and temperature variables. The dynamic viscosity of the fluid is given by an explicit function of the temperature, leading to the presence of…

AIMS Mathematics, 2020, 5 (1), pp.311-331. ⟨10.3934/math.2020021⟩. ⟨hal-02398893⟩

Article dans une revue

Uniform a priori estimates for elliptic problems with impedance boundary conditions

Théophile Chaumont-Frelet, Serge Nicaise, Jérôme Tomezyk

We derive stability estimates in H2 for elliptic problems with impedance boundary conditions that are uniform with respect to the impedance coefficient. Such estimates are of importance to establish sharp error estimates for finite element discretizations of contact impedance and high-frequency…

Communications on Pure and Applied Analysis, 2020, ⟨10.3934/cpaa.2020107⟩. ⟨hal-01887269⟩