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Affichage de 301 à 310 sur 1021

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⟩

Communication dans un congrès

Design and performance analysis of Rectenna Circuit

Khadija El Batal, Nabil Chakhchaoui, Adil Eddiai, Mounir Meddad, Mohamed Rguiti, M'Hammed Mazroui, Omar Cherkaoui

Abstract Radio Frequency Energy harvesting is an extremely important research subject, linked to sustainability, and could be a potential solution to conventional energy supplies. The main idea is to develop battery-free wireless sensors able to capture the available energy into the mentioned…

2nd International Conference on Advances in Energy Technology, Environmental Engineering and Materials Science, AETEEMS 2018, Dec 2018, El Jadida, Morocco. pp.012006, ⟨10.1088/1757-899X/948/1/012006⟩. ⟨hal-04469995⟩

Communication dans un congrès

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

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

As the conventional binder jetting method is limited in terms of achievable density and finish surface, a new concept of hybrid subtractive/additive manufacturing system has been recently developed. The system relies on a modified binder jetting machine which integrates a slurry-based deposition…

Young Ceramists Additive Manufacturing Forum (yCAM 2020), Oct 2020, Online (Covid 19), France. ⟨hal-04393273⟩

HDR

Quelques aspects analytiques des zéros des fonctions L, Some analytical aspects of the zeros of L-functions

Kamel Mazhouda

Le mémoire de l'HDR présente une sélection de mes activités de recherche ayant consisté à étudier théoriquement et numériquement les zéros non-triviaux des fonctions L sur la ligne critique Re(s) = 1/2, où s est un nombre complexe. Les travaux variés présentés sont groupés en quatre parties.…, The HDR thesis presents a selection of my research activities which consisted in studying theoretically and numerically the non-trivial zeros of the functions L on the critical line Re(s) = 1/2, where s is a complex number. The various works presented are grouped into four parts. The first three…

Mathématiques [math]. Université Polytechnique Hauts-de-France, 2020. ⟨tel-03977341⟩

Communication dans un congrès

Synthèse et développement de β-TCP dopés destinés à la fabrication de substituts osseux par robocasting

Nicolas Somers, Florian Jean, Marie Lasgorceix, Anthony Thuault, Cathy Delmotte, Nicolas Preux, Anne Leriche

Le β-tricalcium phosphate (β-TCP, β-Ca3(PO4)2) est un des matériaux le plus étudiés pour la réalisation de substituts osseux puisqu’il présente d’intéressantes propriétés de biocompatibilité, d'ostéoconductivité et de résorption. En effet, le TCP est largement utilisé pour le remodelage de…

6th annual meeting of the Commission mixte Matériaux pour la Santé, Oct 2020, France, France. ⟨hal-04393056⟩

Proceedings/Recueil des communications

Reflections on some research work of bang-yen chen

Joeri van Der Veken, Alfonso Carriazo, Ivko Dimitrić, Yun Myung Oh, Bogdan D Suceavă, Luc Vrancken

This essay provides a brief sketch of selected mathematical research work of Bang-Yen Chen done during the last fifty years.

Geometry of submanifolds AMS special session in honor of Bang-Yen Chen's 75th birthday, Oct 2018, Ann Arbor, Michigan, United States. 756, American Mathematical Society, 2020, Contemporary Mathematics, ⟨10.1090/conm/756/15195⟩. ⟨hal-03722847⟩

Communication dans un congrès

Warped product hypersurfaces in pseudo-riemannian real space forms

Marilena Moruz, Luc Vrancken

We study hypersurfaces in pseudo-Riemannian real space forms of non-zero sectional curvature, which write as a warped product of a 1-dimensional base with an (n − 1)-manifold of constant sectional curvature. We show that either they have constant sectional curvature or they are contained in a…

AMS Special Session on Geometry of Submanifolds, in honor of Bang-Yen Chen's 75th birthday, Oct 2018, Ann Arbor, Michigan, United States. pp.173-186, ⟨10.1090/conm/756/15207⟩. ⟨hal-03722924⟩

Article dans une revue

On product affine hyperspheres in ℝn+1

Xiuxiu Cheng, Zejun Hu, Marilena Moruz, Luc Vrancken

In this paper, we study locally strongly convex affine hyperspheres in the unimodular affine space ℝn+1 which, as Riemannian manifolds, are locally isometric to the Riemannian product of two Riemannian manifolds both possessing constant sectional curvature. As the main result, a complete…

Science China Mathematics, 2020, 63 (10), pp.2055-2078. ⟨10.1007/s11425-018-9457-9⟩. ⟨hal-03722937⟩

Article dans une revue

Nonlinear fractional Laplacian problems with nonlocal ‘gradient terms’

Boumediene Abdellaoui, Antonio J. Fernández Sánchez

Abstract Let $\Omega \subset \mathbb{R}^{N} $ , N ≽ 2, be a smooth bounded domain. For s ∈ (1/2, 1), we consider a problem of the form $$\left\{\begin{array}{@{}ll} (-\Delta)^s u = \mu(x)\, \mathbb{D}_s^{2}(u) + \lambda f(x), & {\rm in}\,\Omega, \\ u= 0, & {\rm in}\,\mathbb{R}^{N} \setminus…

Proceedings of the Royal Society of Edinburgh: Section A, Mathematics, 2020, 150 (5), pp.2682-2718. ⟨10.1017/prm.2019.60⟩. ⟨hal-03337289⟩

Communication dans un congrès

Fabrication of higher thermal stability doped β-tricalcium phosphate bioceramics by robocasting

Nicolas Somers, Florian Jean, Marie Lasgorceix, Anthony Thuault, Nicolas Preux, Cathy Delmotte, Fabrice Petit, Anne Leriche

β-tricalcium phosphate (β-TCP, β-Ca3(PO4)2) is one of the most attractive biomaterials for bone repair since it shows an excellent biological compatibility, osteoconductivity, and resorbability. Due to its interesting properties, it can be used to produce bone implants serving as temporary supports…

young Ceramists Additive Manufacturing Forum (YCAM 2020), Oct 2020, Online (Covid 19), France. ⟨hal-04393277⟩