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Affichage de 1 à 10 sur 1082

  • Article dans une revue

Adaptive sparse-knot spline models for approximating sequences of noisy data points in arbitrary-dimensional spaces

Thierry Bay, Carolina Vittoria Beccari, Lucia Romani, Laura Saini

We address the problem of adaptive approximation of sequences of noisy data points in arbitrary-dimensional spaces using spline models of any degree and smoothness. Knot vectors are determined as solutions of unconstrained sparse optimization problems, yielding a flexible and compact representation…

Computer-Aided Design, 2026, 201, pp.104160. ⟨10.1016/j.cad.2026.104160⟩. ⟨hal-05740393⟩

  • Pré-publication, Document de travail

Sharp decay rate and asymptotic simplification for a quasilinear heat equation

Maryam Al Hajjar, Ioana Ciotir, Matthias Täufer

<div><p>We study the decay rate for a quasilinear heat equation of the form $ \dot u-\Delta u = \operatorname{div B}(\nabla u)$. The term on the right-hand-side is interpreted as a nonlinear perturbation of the ordinary heat equation and we will prove an optimal decay rate for the…

2026. ⟨hal-05769211⟩

  • Article dans une revue

Dual influence of aluminum doping on the dielectric and conductive mechanisms of BaTiO3

Soufyane Satha, Mohamed Aymen Ben Achour, Mohamed Rguiti, Yannick Lorgouilloux, Florian Jean, Christian Courtois

<div><p>While BaTiO 3 ceramics are mainly used in high-performance capacitors, their potential for conductive applications remains underexplored because of their highly insulating nature. In this work, Al-doped BaTiO 3 ceramics were synthesized by solid-state reaction following the…

Ceramics International, 2026, ⟨10.1016/j.ceramint.2026.09.240⟩. ⟨hal-05761377⟩

  • Article dans une revue

Stabilization of the nonlinear KdV equation with a saturated boundary delayed term

Natàlia Lucas, Emmanuelle Crépeau

We address the nonlinear KdV equation with saturation and delay effects on the boundary. Exponential stability is established under appropriate assumptions using two different approaches: a Lyapunov functional method, which requires a restrictive condition on the domain length, and an approach…

Systems and Control Letters, 2026, 216, pp.106517. ⟨10.1016/j.sysconle.2026.106517⟩. ⟨hal-05678947⟩

  • Article dans une revue

Predictive Mastercurves for Direct Ink Writing: Application to Sustainable and Piezoelectric PLA‐Anisole Inks

Mathilde Delcourt, Caroline Duc, Tom Lacassagne, Lucas Vernagut, Mohamed Aymen Ben Achour, Sébastien Charlon, Cédric Samuel

Direct ink writing represents a straightforward printing technique for functional inks. Predicting their behavior is of prime importance to optimize ink formulations for high‐quality printed designs. DIW behaviors of sustainable and Newtonian PLA‐anisole inks are here investigated along with…

Advanced Materials Technologies, 2026, 11 (15), ⟨10.1002/admt.71226⟩. ⟨hal-05724956⟩

  • Article dans une revue

Infinitely many normalized solutions of $L^2$-supercritical NLS equations on noncompact metric graphs with localized nonlinearities

Pablo Carrillo, Damien Galant, Louis Jeanjean, Christophe Troestler

We consider the existence of solutions for nonlinear Schr\"odinger equations on noncompact metric graphs with localized nonlinearities. In an $L^2$-supercritical regime, we establish the existence of infinitely many solutions for any prescribed mass.

Discrete and Continuous Dynamical Systems - Series A, 2026, Special issue on normalized solutions of nonlinear Schrődinger equations & beyond, 53, pp.82-105. ⟨10.3934/dcds.2025085⟩. ⟨hal-04590083⟩

  • Article dans une revue

Additive manufacturing of NBT-6BT piezoceramics by stereolithography (SLA): processing window, post-treatment optimization and functional properties

Anass Chrir, Mohamed Rguiti, Mohamed Ben Achour, Rabie Aloui, Barbara Lafarge, Yannick Lorgouilloux, Christian Courtois

0.94(Na0.5Bi0.5)TiO3-0.06BaTiO3 (NBT-6BT) lead-free piezoceramic parts were fabricated by laser stereolithography (SLA) from highly loaded photocurable slurries, followed by thermal debinding and sintering. Two slurries (30 and 35 vol%) were formulated and exhibited shear-thinning behavior suitable…

Journal of the European Ceramic Society, 2026, 46 (16), pp.118687. ⟨10.1016/j.jeurceramsoc.2026.118687⟩. ⟨hal-05695536⟩

  • Article dans une revue

First-principles analysis of Sr-doped BaTiO3 perovskites’ structural, optical, and thermoelectric properties

Hicham Kacimi-Naciri, Siham Malki, Meriem Ben Zennou, Assia Mabrouk, Mohamed Rguiti, Rachid Amrousse, Nadia Faska, Ahmed Bachar

The influence of strontium (Sr) incorporation on the crystal structure of barium titanate (BaTiO 3 ) has been extensively studied using density functional theory (DFT) calculations with the WIEN2k package and the GGA-PBE method, resulting in significant improvements in its optical and transport…

Results in Physics, 2026, 86, pp.108682. ⟨10.1016/j.rinp.2026.108682⟩. ⟨hal-05625182⟩

  • Thèse

Contribution au développement de capteurs ultrasonores SAW sur base de substrats piézoélectriques de type vitrocéramique pour des mesures à haute température, Contribution to the development of SAW ultrasonic sensors based on glass-ceramic piezoelectric substrates for high-temperature measurements.

Oussama Zwein

Cette thèse s’inscrit dans le développement de capteurs ultrasonores à ondes acoustiques de surface (Surface Acoustic Wave, SAW) destinés aux environnements industriels sévères. Elle vise à démontrer la faisabilité de dispositifs SAW réalisés à partir de substrats vitrocéramiques polaires à base de…, This PhD thesis is part of the development of ultrasonic Surface Acoustic Wave (SAW) sensors intended for harsh industrial environments. It aims to demonstrate the feasibility of SAW devices fabricated on polar glass-ceramic substrates based on fresnoite (Sr₂TiSi₂O₈ – STS), capable of operating at…

Acoustique [physics.class-ph]. Université Polytechnique Hauts-de-France; Université de Mons (Belgique), 2026. Français. ⟨NNT : 2026UPHF0022⟩. ⟨tel-05746508⟩

  • Article dans une revue

Multiscale characterization and CFD-driven optimization of 3D-printed geopolymer composites for high-temperature molds

Abrar Gasmi, Christine Pélegris, Mohamed Guessasma, Ralph Davidovits, Florian Jean, Anthony Thuault, Richard Ball

This study investigated the development of geopolymer formulations suitable for additive manufacturing, with a particular focus on their thermo-mechanical performance under high-temperature service conditions. The materials were designed to withstand temperatures up to 800 °C while exhibiting…

Ceramics International, 2026, ⟨10.1016/j.ceramint.2026.06.272⟩. ⟨hal-05692978⟩