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Affichage de 41 à 50 sur 1079

Article dans une revue

Estimation of the asymptotic variance matrix of the least squares estimator of weak FARIMA models

Yacouba Boubacar Mainassara, Youssef Esstafa

In this article, we propose a consistent estimator for the asymptotic variance matrix of the least squares estimator in Fractionally AutoRegressive Integrated Moving‐Average (FARIMA) models. Our approach allows for error terms that are uncorrelated, but not necessarily independent. Modified…

Statistica Neerlandica, 2025, 79 (3), ⟨10.1111/stan.70009⟩. ⟨hal-05531048⟩

Article dans une revue

Hydrothermal Synthesis and Structural Characterization of a New Lead Tri-magnesium Phosphate PbMg3(HPO4)(PO4)2

Ahmed Ould Saleck, Cyrille Albert-Mercier, Claudine Follet-Houttemane, Abderrazzak Assani, Lahcen El Ammari, Mohamed Saadi

A new lead tri-magnesium phosphate PbMg3(HPO4)(PO4)2 was synthesized by hydrothermal method and characterized by single crystal X-ray diffraction.

Journal of Chemical Crystallography, 2025, 55 (4), pp.259-266. ⟨10.1007/s10870-025-01056-3⟩. ⟨hal-05538269⟩

Article dans une revue

Smart piezoelectric energy harvesting: how topology-optimized cavities boost performance in BaTiO 3 multilayer structures

Najoua Fangachi, Mohamed Rguiti, Madiha Yessari, Abdelowahed Hajjaji

Abstract The escalating global energy demand and environmental challenges underscore the urgent need for efficient, sustainable energy-harvesting solutions. In this study, we present a lead-free multilayer piezoelectric energy harvester, termed Arcade Sensor A, fabricated from BaTiO 3 ceramics and…

Smart Materials and Structures, 2025, 34 (8), pp.085001. ⟨10.1088/1361-665X/adf423⟩. ⟨hal-05687801⟩

Article dans une revue

Improving mechanical stability of SBA-15 monoliths prepared from polymeric scaffolds replication using bentonite clay

Ridvan Yildiz, Jérémy Dhainaut, Carmen Ciotonea, Jean-Philippe Dacquin, Sébastien Royer, Christian Courtois, Yannick Lorgouilloux

The preparation of porous yet mechanically stable centimetric monoliths remains challenging using traditional methods. Herein, hierarchical SBA-15-based porous monoliths, with three levels of porosity (micro- and mesopores from the pores arrangement of the silica structure, and macropores from the…

Journal of Porous Materials, 2025, 32 (4), pp.1561-1569. ⟨10.1007/s10934-025-01791-0⟩. ⟨hal-05676447⟩

Article dans une revue

Improving mechanical stability of SBA-15 monoliths prepared from polymeric scaffolds replication using bentonite clay

Ridvan Yildiz, Jérémy Dhainaut, Carmen Ciotonea, Jean-Philippe Dacquin, Sébastien Royer, Christian Courtois, Yannick Lorgouilloux

The preparation of porous yet mechanically stable centimetric monoliths remains challenging using traditional methods. Herein, hierarchical SBA-15-based porous monoliths, with three levels of porosity (micro- and mesopores from the pores arrangement of the silica structure, and macropores from the…

Journal of Porous Materials, 2025, 32 (4), pp.1561-1569. ⟨10.1007/s10934-025-01791-0⟩. ⟨hal-05008616⟩

Poster de conférence

Experimental and DFT study of the structural, electronic and thermoelectrical properties of Li 3x La 2/3-x TiO 3 (x=0.125) Ceramic leads free for battery applications

Hicham Kacimi-Naciri, Ahmed Bachar, Assia Mabrouk

The solid-state sintering method, aiming for its application as a solid-state electrolyte in lithium-ion batteries. The resulting material was characterized experimentally through X-ray diffraction (XRD), dielectric measurements (permittivity and loss), complex impedance analysis, and electrical…

Faculté des Sciences Appliquées - Ait Melloul, Jul 2025, AGADIR (virtuel), France. ⟨hal-05583572⟩

Article dans une revue

DFT-based and experimental study on Sr-doped BaTiO3: Impacts on piezoelectric and ferroelectric performance

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

This study combines first-principles Density Functional Theory (DFT) calculations and experimental analysis to investigate the impact of Sr-doping on the structural, electronic, and piezoelectric properties of Ba1-xSrxTiO3(BST) perovskites at different Sr concentrations (x = 0, 0.125, 0.25…

Ceramics International, 2025, 51 (17), pp.23801-23813. ⟨10.1016/j.ceramint.2025.03.069⟩. ⟨hal-05583186⟩

Article dans une revue

Determination of discontinuous diffusion coefficients for the heat equation on a tree-shaped network

Emmanuelle Crépeau, Lionel Rosier, Julie Valein

In this paper, we study the heat equation on a tree-shaped network with a piecewise regular diffusion coefficient. By developing new Carleman estimates, we establish stability results for the identification of the diffusion coefficient. These stability estimates are derived using either internal…

Inverse Problems, 2025, 41 (7), pp.075001. ⟨10.1088/1361-6420/ade3f9⟩. ⟨hal-05464931⟩

Poster de conférence

Étude par DFT de l'impact du dopage au Sr sur les propriétés structurales, électroniques, piézoélectriques et ferroélectriques du BaTiO3

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

Les matériaux piézoélectriques sans plomb sont développés pour leurs applications variées et leur impact environnemental réduit. Les pérovskites Ba 1-x Sr x TiO 3 (BST) offrent un potentiel intéressant grâce à leur structure modulable. Cette étude examine l'effet du dopage au strontium (Sr)…

Journée Matériaux & Énergie Électrique, Jun 2025, Maubeuge, France. ⟨hal-05583575⟩

Article dans une revue

The Curious Spectra and Dynamics of Non-locally Finite Crystals

Joachim Kerner, Olaf Post, Mostafa Sabri, Matthias Täufer

Abstract This paper is devoted to the investigation of the spectral theory and dynamical properties of periodic graphs which are not locally finite but carry non-negative, symmetric and summable edge weights. These graphs are shown to exhibit rather intriguing behaviour: for example, we construct a…

Communications in Mathematical Physics, 2025, 406 (7), pp.169. ⟨10.1007/s00220-025-05346-x⟩. ⟨hal-05138415⟩