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Affichage de 181 à 190 sur 567

  • 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

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

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⟩

  • Article dans une revue

Spark Plasma Sintering and tribological behavior of Ti3SiC2–Ti5Si3–TiC composites

Abdessabour Benamor, Youcef Hadji, Nabil Chiker, Adel Haddad, Bendiba Guedouar, Mohamed Labaiz, Maamar Hakem, Arnaud Tricoteaux, Christelle Nivot, Jean-Pierre Erauw, Riad Badji, Mohamed Hadji

Herein, we study the effect of TiC content on the tribological behavior of four Ti3SiC2/Ti5Si3/TiC composites, prepared through Spark Plasma Sintering. The tribological properties were investigated under dry sliding, against Al2O3 counterpart at room temperature, under different normal loads and…

Ceramics International, 2019, 45 (17), pp.21781-21792. ⟨10.1016/j.ceramint.2019.07.181⟩. ⟨hal-03479239⟩

  • Article dans une revue

Nanotechnology to improve the performances of hydrodynamic surfaces

Ali Ahmed Alshehri, Philippe Champagne, Laurent Keirsbulck, El Hadj Dogheche

ure continues to inspire scientists to adapt solutions in order to satisfy human needs, mainly in the maritime domain with metallic surface corrosion and its mechanical friction. In this research, the source of innovation comes from the lotus leaf and its well-known super-hydrophobicity. In this…

Coatings, 2019, 9 (12), pp.808. ⟨10.3390/coatings9120808⟩. ⟨hal-03133311⟩

  • 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⟩

  • 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⟩

  • 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⟩

  • Article dans une revue

Comparing variational methods for the hinged Kirchhoff plate with corners

Colette De Coster, Serge Nicaise, Guido Sweers

The hinged Kirchhoff plate model contains a fourth order elliptic differential equation complemented with a zeroeth and a second order boundary condition. On domains with boundaries having corners the strong setting is not well‐defined. We here allow boundaries consisting of piecewise C2, 1‐curves…

Mathematical News / Mathematische Nachrichten, 2019, 292 (12), pp.2574-2601. ⟨10.1002/mana.201800092⟩. ⟨hal-03164134⟩