Publications

• Article dans une revue

First-principles theoretical study of pure and Ti, Zr, and Hf doped K0.5Na0.5NbO3: Structural, electronic, mechanical, and piezoelectric properties

Hicham Kacimi-Naciri, Mohamed Rguiti, Assia Mabrouk, Rachid Amrousse, Christian Courtois, Mohamed Aymen Ben Achour, Ahmed Bachar

Lead-free piezoelectric materials are gaining attention as environmentally sustainable alternatives to lead zirc­onate titanate (PZT)-based ceramics. Among these, potassium-sodium niobate (K0.5Na0.5NbO3, KNN) shows promising piezoelectric properties but faces challenges in densification and…

Ceramics International, 2026, 52 (7), pp.8607-8618. ⟨10.1016/j.ceramint.2026.01.059⟩. ⟨hal-05583201⟩

• Communication dans un congrès

Synthesis of doped biphasic calcium phosphate for bone substitutes.

Vincent Gillet, Marie Lasgorceix, Florian Jean, Anne Leriche, Stephane Hocquet

Among synthetic bone substitutes, calcium phosphate materials such as β-tricalcium phosphate (β-TCP, β-Ca₃(PO₄)₂) and hydroxyapatite (HA, Ca₁₀(PO₄)₆(OH)₂) are widely used due to their excellent biocompatibility and osteoconductive properties. However, these two phases exhibit different resorption…

19th European Inter-Regional Conference on Ceramics (CIEC 19), Feb 2026, Leoben, Austria. ⟨hal-05583051⟩

• Article dans une revue

Equivalence between VMO functions and plurisubharmonic functions with zero Lelong numbers

Séverine Biard, Jujie Wu

<div><p>We prove that a plurisubharmonic function on a domain in the complex Euclidean space is a locally VMO (Vanishing Mean Oscillation) function if and only if its Lelong number at each point vanishes. We also give a global version of this result when the boundary of the domain…

Mathematische Zeitschrift, 2026, 312 (2), pp.60. ⟨10.1007/s00209-026-03952-6⟩. ⟨hal-05478910⟩

• Chapitre d'ouvrage

Graph Structure of the Nodal Set and Bounds on the Number of Critical Points of Eigenfunctions on Riemannian Manifolds

Matthias Hofmann, Matthias Täufer

Mathematical Models for Interacting Dynamics on Networks, Springer Nature Switzerland, pp.389-410, 2026, Trends in Mathematics, ⟨10.1007/978-3-032-02326-1_15⟩. ⟨hal-05661453⟩

• Article dans une revue

Experimental and DFT study of the structural, electronic, and thermoelectrical properties of Li3xLa2/3-xTiO3 (x = 0.125) ceramic leads free for battery applications

Hicham Kacimi-Naciri, Meriem Ben Zennou, Assia Mabrouk, Amine El Azizi, Mohamed Loutou, Mohammed Mansori, Rachid Amrousse, Nadia Faska, Ahmed Bachar

We synthesized Li3xLa2/3−xTiO3 (LLTO, x = 0.125) via solid-state sintering, yielding a structurally stable orthorhombic perovskite with high environmental compatibility. The resulting material was characterized experimentally through X-ray diffraction (XRD), dielectric measurements (permittivity…

Next Materials, 2026, 11, pp.101619. ⟨10.1016/j.nxmate.2026.101619⟩. ⟨hal-05488643⟩

• Article dans une revue

Optimization of explicit RKN schemes to minimize spurious reflections from shock wave propagation on non-uniform grids

Emmanuel Creusé, Mamadou N'Diaye, Juliette Venel, Cédric Hubert, Nicolas Leconte

The propagation of shock waves on non-uniform grids appears, for example, in some impact problems of the fast dynamics type, where a finer mesh can typically be employed in regions of interest, leading to mesh ratios that can range from 10 to 20 or even more. Unfortunately, unwanted spurious…

International Journal for Numerical Methods in Engineering, 2026, 127 (1). ⟨hal-05144415v2⟩

• Pré-publication, Document de travail

OPTIMAL SPECTRAL INEQUALITY FOR THE HIGHER-DIMENSIONAL LANDAU OPERATOR

Sedef Özcan, Matthias Täufer

We prove optimal spectral inequalities for Landau operators in full space and in arbitrary dimension. Spectral inequalities are lower bounds on the L 2 -mass of functions in spectral subspaces of finite energy when integrated over a sampling set S ⊂ R d . Landau operators are Schrödinger operators…

2026. ⟨hal-05438797⟩

• Article dans une revue

Block-Additive Gaussian Processes under Monotonicity Constraints

Mathis Deronzier, Andrés F. López-Lopera, François Bachoc, Olivier Roustant, Jérémy Rohmer

We generalize the additive constrained Gaussian process framework to handle interactions between input variables while enforcing monotonicity constraints everywhere on the input space. The block-additive structure of the model is particularly suitable in the presence of interactions, while…

Statistics and Computing, 2026, 36 (1), pp.42. ⟨10.1007/s11222-025-10791-8⟩. ⟨hal-05441153⟩

• Article dans une revue

An BD-entropy inequality preserving Finite Volume scheme for the Quantum Navier-Stokes system

Caterina Calgaro, Robin Colombier, Emmanuel Creusé

In this work, we propose a Finite-Volume scheme on cartesian grids for the numerical approximation of some solutions of the Quantum Navier-Stokes (QNS) equations. An augmented formulation is implemented by introducing an additional drift velocity v, which reduces the third-order quantum operator to…

SMAI Journal of Computational Mathematics, 2026, 12 (43-73). ⟨hal-04837772v2⟩

• Pré-publication, Document de travail

Mathematical modeling of iron oxidation in aqueous environment: when kinetics meets thermodynamics

Christian Bataillon, Clément Cancès, Claire Chainais-Hillairet, Federica Raimondi, Juliette Venel

We propose a one-dimensional model for the evolution at mesoscopic scale of a magnetite/maghemite oxide layer at the surface of iron metal set in an aqueous environment. The model takes into account the convection and diffusion of three charge carriers -iron cations, electrons in the conduction…

2026. ⟨hal-05563753⟩