Publications

• Article dans une revue

An optimal control problem governed by heat equation with nonconvex constraints applied to selective laser melting process

Tonia-Maria Alam, Serge Nicaise, Luc Paquet

This paper deals with a PDE-constraints optimal control problem applied to an Additive Manufacturing process, namely a selective laser melting. Here, we want to control the temperature gradient inside the domain during a fixed time of heating, by acting on the trajectory of the dynamic Gaussian…

Minimax Theory and its Applications, 2021, 6 (2), pp.191-204. ⟨hal-02302403⟩

• Article dans une revue

Guaranteed Quantity of Interest Error Estimate Based on Equilibrated Flux Reconstruction

Zuqi Tang, Suyang Lou, Abdelkader Benabou, Emmanuel Creusé, Serge Nicaise, Julien Korecki, Jean-Claude Mipo

The quality of a local physical quantity obtained by the numerical method, such as the finite element method (FEM), attracts more and more attention in computational electromagnetism. Inspired by the idea of goal-oriented error estimate given for the Laplace problem, this work is devoted to a…

IEEE Transactions on Magnetics, 2021, 57 (6), pp.7402104. ⟨10.1109/TMAG.2021.3071641⟩. ⟨hal-03195757⟩

• Communication dans un congrès

Hybrid additive/subtractive manufacturing system to prepare dense and complex shape ceramic parts

Qirong Chen, Enrique Juste, Marie Lasgorceix, Fabrice Petit, Anne Leriche

45th International Conference and Expo on Advanced Ceramics and Composites (ICACC 2021), Jan 2021, Online Conference, United States. ⟨hal-04393246⟩

• Article dans une revue

Four dimensional biharmonic hypersurfaces in nonzero space forms have constant mean curvature

Zhida Guan, Haizhong Li, Luc Vrancken

In this paper, through making careful analysis of Gauss and Codazzi equations, we prove that four dimensional biharmonic hypersurfaces in nonzero space forms have constant mean curvature. Our result gives the positive answer to the conjecture proposed by Balmuş–Montaldo–Oniciuc in 2008 for four…

Journal of Geometry and Physics, 2021, 160, pp.103984. ⟨10.1016/j.geomphys.2020.103984⟩. ⟨hal-03722617⟩

• HDR

Optimisation des voies alcoolates pour l'élaboration de matériaux céramiques oxydes et de revêtements fonctionnels en réponse aux problématiques environnementales, Optimization of alcoholate routes for the development of oxide ceramic materials and functional coating in response to environmental issues

Philippe Champagne

Le LMCPA est réputé depuis 2000 pour sa capacité à créer diverses pièces céramiques à géométries variables dotées de propriétés remarquables (hautes résistances thermique et mécanique, piézoélectricité, etc ...) et pour sa capacité à synthétiser les poudres nécessaires à cette fabrication. Sur ce…, LMCPA has been renowned since 2000 for its ability to create various ceramic parts with variable geometries endowed with remarkable properties (high thermal and mechanical resistance, piezoelectricity, etc) and for its ability to synthesize the powders necessary for this manufacture. On this last…

• Thèse

Quelques problèmes de contrôle optimal d'équations aux dérivées partielles et applications au procédé de fusion sélective par laser (SLM), Some optimal control problems of partial differential equations and applications to the selective laser melting process (SLM)

Tonia-Maria Alam

Dans cette thèse, nous étudions quelques problèmes de contrôle optimaldes équations aux dérivées partielles avec appliqués au procédé de fusion sélective parlaser. La thèse se compose de quatre chapitres. Dans le chapitre 1, nous introduisonsle sujet de la thèse et nous présentons les principaux…, In this thesis, we study optimal control problems of partial differential equations withan application to the selective laser melting process. The thesis consists of four chapters.In chapter 1, we introduce the topic of the thesis and we present the main results.Chapter 2 deals with an optimal…

Optimisation et contrôle [math.OC]. Université Polytechnique Hauts-de-France, 2020. Français. ⟨NNT : 2020UPHF0022⟩. ⟨tel-03390313⟩

• Article dans une revue

Flash point prediction with UNIFAC type models of ethylic biodiesel and binary/ternary mixtures of FAEEs

Débora Costa Do Nascimento, Natália Daniele Dorighello Carareto, Antonio Marinho Barbosa Neto, Vincent Gerbaud, Mariana Conceição da Costa

In order to guarantee safe handling of a combustible liquid, such as biodiesel, it is important to be aware of its Flash Point (FP). Thus, the present study focused on FP experimental measurement and thermodynamic correlation of binary and ternary mixtures of saturated or unsaturated fatty acid…

Fuel, 2020, 281, pp.118717. ⟨10.1016/j.fuel.2020.118717⟩. ⟨hal-03115520⟩

• Article dans une revue

Modification of hydroxyapatite surface properties by electron irradiation

Guillaume Bai, Jean-Christophe Hornez, Ulrich Maschke, Philippe Supiot, Etienne Bres

In the present work, the modification of wetting properties of EB irradiated HA ceramics are studied under air and N2 gas atmospheres. We show a noticeable increase of the hydrophily of electron irradiated HA ceramics in an air atmosphere and a lesser increase when the samples are irradiated in an…

Radiation Physics and Chemistry, 2020, Radiation Physics and Chemistry, 177, pp.109192. ⟨10.1016/j.radphyschem.2020.109192⟩. ⟨hal-03104388⟩

• Article dans une revue

Hyperbolic Radial Spanning Tree

Lucas Flammant

We define and analyze an extention to the d-dimensional hyperbolic space of the Radial Spanning Tree (RST) introduced by Baccelli and Bordenave in the two-dimensional Euclidean space (2007). In particular, we will focus on the description of the infinite branches of the tree. The properties shown…

Electronic Journal of Probability, 2020. ⟨hal-03024280⟩

• Article dans une revue

Impedance spectroscopy analysis and piezoelectric properties of (Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 + 0.3wt.% Sm 2 O 3 lead-free ceramics sintered at different conditions

Sadia Kennour, Nouara Lamrani-Amaouz, Ahcène Chaouchi, Mohamed Rguiti, Yannick Lorgouilloux, Christian Courtois

(Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt.% Sm2O3 (named NBT-BT) lead-free piezoelectric ceramics were prepared by normal sintering. The effect of atmosphere sintering on NBT-BT ceramics was investigated through X-ray diffraction, dielectric, ferroelectric and piezoelectric characterizations. Real (Z′)…

Ferroelectrics, 2020, 568 (1), pp.5-22. ⟨10.1080/00150193.2020.1811027⟩. ⟨hal-03480198⟩