Publications

• Article dans une revue

Open-celled silicon carbide foams with high porosity from boron-modified polycarbosilanes

Charlotte Durif, Mélanie Wynn, Maxime Balestrat, Giorgia Franchin, Young-Wook Kim, Anne Leriche, Philippe Miele, Paolo Colombo, Samuel Bernard

Open-Celled silicon carbide (SiC) foams were prepared from a mixture of a boron-modified polycarbosilane as a preceramic polymer and poly(methymetacrylate) (PMMA) microbeads as sacrificial agents. The process consists in the cross-linking of the liquid allylhydridopolycarbosilane (AHPCS, SiC…

Journal of the European Ceramic Society, 2019, 39 (16), pp.5114-5122. ⟨10.1016/j.jeurceramsoc.2019.08.012⟩. ⟨hal-02321489⟩

• Article dans une revue

Minimal Lagrangian submanifolds of the complex hyperquadric

Haizhong Li, Hui Ma, Joeri van Der Veken, Luc Vrancken, Xianfeng Wang

We introduce a structural approach to study Lagrangian submanifolds of the complex hyperquadric in arbitrary dimension by using its family of non-integrable almost product structures. In particular, we define local angle functions encoding the geometry of the Lagrangian submanifold at hand. We…

Science China Mathematics, 2019, 63 (8), pp.1441-1462. ⟨10.1007/s11425-019-9551-2⟩. ⟨hal-03723643⟩

• Pré-publication, Document de travail

The Directed Spanning Forest in the hyperbolic space: extended version

Lucas Flammant

The Euclidean Directed Spanning Forest (DSF) is a random forest in R d introduced by Baccelli and Bordenave in 2007 and we introduce and study here the analogous tree in the hyperbolic space. The topological properties of the Euclidean DSF have been stated for d = 2 and conjectured for d ≥ 3 (see…

2019. ⟨hal-02364356⟩

• Communication dans un congrès

Sensitivity range optimization of surface acoustic wave humidity ultrasonic sensors incorporating a polyvinyl alcohol (PVA) layer

Saliou Ndao, Marc Duquennoy, Christian Courtois, Mohammadi Ouaftouh, Mohamed Rguiti, Nikolay Smagin

In this paper, Surface Acoustic Wave (SAW) delay line (DL) based humidity sensors are optimized. These sensors comprise two ultrasonic interdigital transducers (IDT) for generating and detecting SAW. The SAWs propagate along a piezoelectric substrate covered with a polyvinyl alcohol (PVA) layer…

18th IEEE Sensors Conference, IEEE SENSORS 2019, Oct 2019, Montreal, Canada. pp.1-4, ⟨10.1109/SENSORS43011.2019.8956596⟩. ⟨hal-03594341⟩

• Article dans une revue

Dielectric, ferroelectric, piezoelectric properties, and impedance spectroscopy of (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 )O 3 -x% (K 0.5 Bi 0.5 )TiO 3 lead-free ceramics

Naima Zidi, Ahcène Chaouchi, Mohamed Rguiti, Yannick Lorgouilloux, Christian Courtois

The influence of (K0.5Bi0.5)TiO3 on structure, microstructure and piezoelectric properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCTZ) piezoelectric ceramics was investigated. Impedance spectroscopy was used to get better understanding of the electrical properties of the materials as a function of…

Ferroelectrics, 2019, 551 (1), pp.152-177. ⟨10.1080/00150193.2019.1658043⟩. ⟨hal-03479286⟩

• Thèse

Nouvelles céramiques piézoélectriques sans plomb pour des applications sonar ou de contrôle non destructif, Lead free piezoelectric ceramics for sonar applications and non destructive control

Kelly Orlik

Cette étude est focalisée sur l’élaboration du titanate de baryum dopé au calcium et au zirconium (BCTZ), de formule Ba₀∙₈₅Ca ₀∙₁₅Ti₀∙₉₀Zr₀∙₁₀O₃, par voie solide, le but étant de mettre au point un protocole de synthèse et de frittage optimisé et répétable de ce matériau piézoélectrique sans plomb…, In this work barium titanate doped with calcium and zirconium (BCTZ), with the composition Ba₀⋅₈₅Ca₀⋅₁₅Ti₀⋅₉₀Zr₀⋅₁₀O₃, was synthesized by solid-state route. The aim of this work was to elaborate an optimized and reproducible synthesis and sintering procedure. Besides, the composition was slightly…

Mécanique des matériaux [physics.class-ph]. Université Polytechnique Hauts-de-France, 2019. Français. ⟨NNT : 2019UPHF0010⟩. ⟨tel-03155181⟩

• Communication dans un congrès

High-order DG-SE approximations of elastodynamic wave problems with stable Perfectly Matched Layers

Hélène Barucq, Henri Calandra, Aurélien Citrain, Julien Diaz, Christian Gout

MATHIAS Days, Applied Mathematics, Scientific Computing, Data Science and Artificial Intelligence, Oct 2019, Serris, France. ⟨hal-02425960⟩

• Poster de conférence

Doping β-TCP ceramics to improve their densification and mechanical properties in use of resorbable bone substitutes

Nicolas Somers, Florian Jean, Marie Lasgorceix, Anthony Thuault, Fabrice Petit, Anne Leriche

Workshop for Ceramics and Glasses in Medical Applications (Y-CGMed 2019), Oct 2019, madrid, Spain. ⟨hal-04392679⟩

• Article dans une revue

Tribological behavior of composites fabricated by reactive SPS sintering in Ti‐Si‐C system

Youcef Hadji, Abdessabour Benamor, Nabil Chiker, Adel Haddad, Nacer Tala-Ighil, Jean-Pierre Erauw, Vedi Dupont, Arnaud Tricoteaux, Christelle Nivot, Anthony Thuault, Mohamed Hadji

In this study, wear and friction behavior of two based-composites from the Ti-Si-C system, (40 wt% TiC; 28 wt% Ti5Si3; 17 wt% Ti3SiC2) and (18 wt% TiC; 26 wt% Ti5Si3; 41 wt% Ti3SiC2) reinforced by 15 wt% of large size SiC (100-150 µm) particles were investigated. The four-phase composites exhibited…

International Journal of Applied Ceramic Technology, 2019, 17 (2), pp.695-706. ⟨10.1111/ijac.13443⟩. ⟨hal-03479330⟩

• Thèse

Existence and multiplicity of solutions for elliptic problems with critical growth in the gradient, Existence et multiplicité de solutions pour des problèmes elliptiques avec croissance critique dans le gradient

Antonio J. Fernández Sánchez

In this thesis, we provide existence, non-existence, uniqueness and multiplicity results for partial differential equations with critical growth in the gradient. The principal techniques employed in our proofs are variational techniques, lower and upper solution theory, a priori estimates and…, Dans cette thèse, nous donnons des résultats d’existence, de non-existence, d’unicité et de multiplicité de solutions pour des équations aux dérivées partielles avec croissance critique dans le gradient. Les principales méthodes utilisées dans nos preuves sont des arguments variationnels, la…

Analysis of PDEs [math.AP]. Université de Valenciennes et du Hainaut-Cambresis, 2019. English. ⟨NNT : 2019VALE0020⟩. ⟨tel-02299049⟩