Publications

• Poster de conférence

Subdivision curves in the complex plane

Salim Taleb

Second Conference on Subdivision, Geometric and Algebraic Methods, Isogeometric Analysis and Refinability, Sep 2017, Gaeta, Italy. ⟨hal-03212486⟩

• Article dans une revue

Structural, dielectric and piezoelectric study of Ca-, Zr-modified BaTiO3 lead-free ceramics

H Msouni, Amina Tachafine, M El Aatmani, Didier Fasquelle, Jean-Claude Carru, M El Hammioui, Mohamed Rguiti, A Zegzouti, A Outzourhit, M Daoud

We prepared a lead-free ceramic (Ba0.85 Ca0.15)(Ti1−x Zrx )O3 (BCTZ) using the conventional mixed oxide technique. The samples were prepared by an ordinary mixing and sintering technique. In this study we investigated how small amounts of Zr 4+ can affect the crystal structure and microstructure as…

Bulletin of Materials Science, 2017, 40 (5), pp.925-931. ⟨10.1007/s12034-017-1445-6⟩. ⟨hal-04280961⟩

• Article dans une revue

On shrinkage and structure changes of pure and blended Portland concretes

Yao Zhang, Catherine A. Davy, Grégory Tricot, Cyrille Albert-Mercier, Natacha Henry, Pieter Bertier, Fréderic Cazaux, Denis Damidot, Xavier Bourbon

This research investigates the long-term shrinkage and Relative Mass Loss (RML) of mature Portland concretes (pure CEMI and blended CEMV/A), at temperatures of 20°C and 80°C. When placed at 80°C and at relative humidities (RH) below 50-60%, concrete shrinkage increases with very slow stabilization…

Journal of the American Ceramic Society, 2017, 100 (9), pp.4131 - 4152. ⟨10.1111/jace.14915⟩. ⟨hal-01593370⟩

• Article dans une revue

Classification of the Locally Strongly Convex Centroaffine Hypersurfaces with Parallel Cubic Form

Xiuxiu Cheng, Zejun Hu, Marilena Moruz

In this paper, we study locally strongly convex centroaffine hypersurfaces with parallel cubic form with respect to the Levi–Civita connection of the centroaffine metric. As the main result, we obtain a complete classification of such centroaffine hypersurfaces. The result of this paper is a…

Results in mathematics = Resultate der Mathematik, 2017, 72 (1-2), pp.419-469. ⟨10.1007/s00025-017-0651-2⟩. ⟨hal-03233934⟩

• Thèse

Linearization of algebraic structures with operads and polynomial functors : Quadratic equivalences and the Baker-Campbell-Hausdorff formula for 2-step nilpotent varieties, Linéarisation de structures algébriques à l'aide d'opérades et de foncteurs polynomiaux : Les équivalences quadratiques et la formule de Baker-Campbell-Hausdorff pour les variétés 2-nilpotentes

Thibault Defourneau

The aim of this work consists of establishing the foundations and first steps of a research project which aims at a new understanding and generalization of the classical Baker-Campbell-Hausdorff formula with a conceptual approach, and its main application in group theory: refining a result of Mal…, Le travail de thèse contribue à établir des liens entre structures algébriques non-linéaires, décrites par des théories algébriques, et des structures algébriques linéaires, encodées par des algèbres sur une opérade linéaire. Pour les théories algébriques dont les modèles forment une catégorie semi…

Algebraic Topology [math.AT]. Université de Valenciennes et du Hainaut-Cambresis, 2017. English. ⟨NNT : 2017VALE0024⟩. ⟨tel-03461727⟩

• Article dans une revue

Optimization of PZT ceramic IDT sensors for health monitoring of structures

Rafatou Takpara, Marc Duquennoy, Mohammadi Ouaftouh, Christian Courtois, Frédéric Jenot, Mohamed Rguiti

Surface acoustic waves (SAW) are particularly suited to effectively monitoring and characterizing structural surfaces (condition of the surface, coating, thin layer, micro-cracks…) as their energy is localized on the surface, within approximately one wavelength. Conventionally, in non-destructive…

Ultrasonics, 2017, 79, pp.96-104. ⟨10.1016/j.ultras.2017.04.007⟩. ⟨hal-03080493⟩

• Thèse

Caractérisation mécanique de céramiques poreuses sous forme massive et de revêtement par indentation instrumentée Knoop, Mechanical characterization of porous bulk and coating ceramics by Knoop instrumented indentation

Ghailen Ben Ghorbal

L’indentation instrumentée est largement utilisée pour la détermination des propriétés mécaniques des matériaux, principalement la dureté et le module d’élasticité. Pour obtenir des données fiables, plusieurs corrections comme la prise en compte du défaut de pointe et la complaisance de l’…, Instrumented indentation is widely used for the assessment of mechanical properties, mainly hardness and elastic modulus. In order to obtain reliable results, analysis methodology has to refer several corrections, such as tip defect and frame compliance. However, these corrections are insufficient…

Matériaux. Université de Valenciennes et du Hainaut-Cambresis, 2017. Français. ⟨NNT : 2017VALE0022⟩. ⟨tel-02182660⟩

• Article dans une revue

Molecular Chemistry and Engineering of Boron-Modified Polyorganosilazanes as New Processable and Functional SiBCN Precursors

Antoine Viard, Diane Fonblanc, Marion Schmidt, Abhijeet Lale, Chrystelle Salameh, Anne Soleilhavoup, Mélanie Wynn, Philippe Champagne, Sophie Cerneaux, Florence Babonneau, Georges Chollon, Fabrice Rossignol, Christel Gervais, Samuel Bernard

A series of boron-modified polyorganosilazanes was synthesized from a poly(vinylmethyl-co-methyl)silazane and controlled amounts of borane dimethyl sulfide. The role of the chemistry behind their synthesis has been studied in detail by using solid-state NMR spectroscopy, FTIR spectroscopy, and…

Chemistry - A European Journal, 2017, 23 (38), pp.9076 - 9090. ⟨10.1002/chem.201700623⟩. ⟨hal-01670294⟩

• Communication dans un congrès

A METHOD TO CONNECT MATHEMATICS AND SCIENCES USING A COMPUTER ALGEBRA SYSTEM

Jean-Paul Becar, Jean-Charles Canonne, Laurent Vermeiren, Fabrice Robert, Eric Cartignies

The paper presents an experience driven over twenty years in an Institute of Technology. The two first authors are mathematicians, the third one is teaching automatic control and the last is a specialist in digital electronics. The authors have worked, discussed and shared their common teaching…

9th International Conference on Education and New Learning Technologies (EDULEARN), Jul 2017, Barcelona, Spain. ⟨hal-02477769⟩

• Article dans une revue

Stability analysis of switched linear systems on non-uniform time domain with unstable subsystems

Fatima Zohra Taousser, Michael Defoort, Mohamed Djemai, Serge Nicaise

In finite element computations, the choice of the mesh is crucial to obtain accurate solutions. In order to evaluate the quality of the mesh, a posteriori error estimators can be used. In this paper, we develop residual-based error estimators for magnetostatic problems with both classical…

IFAC-PapersOnLine, 2017, 50 (1), pp.14873-14878. ⟨10.1016/j.ifacol.2017.08.2524⟩. ⟨hal-03164172⟩