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Article dans une revue

Lagrangian submanifolds with constant angle functions of the nearly Kähler S3 × S3

Burcu Bektaş, Marilena Moruz, Joeri van Der Veken, Luc Vrancken

We study Lagrangian submanifolds of the nearly Kähler S3 × S3 with respect to their so called angle functions. We show that if all angle functions are constant, then the submanifold is either totally geodesic or has constant sectional curvature and there is a classification theorem that follows...

Journal of Geometry and Physics, 2018, 127, pp.1-13. ⟨10.1016/j.geomphys.2018.01.011⟩. ⟨hal-03233861⟩

Article dans une revue

Blow–up for nonlinear Maxwell equations

Piero d'Ancona, Serge Nicaise, Roland Schnaubelt

We construct classical solutions to the nonlinear Maxwell system with periodic boundary conditions which blow up in H(curl). A similar result is shown on the full space. Our construction is based on an analysis of a shock wave in one space dimension.

Electronic Journal of Differential Equations, 2018, 2018 (73), pp.1-9. ⟨hal-03137619⟩

Article dans une revue

Flat Almost Complex Surfaces in the Homogeneous Nearly Kähler S3×S3

Bart Dioos, Haizhong Li, Hui Ma, Luc Vrancken

By employing a nice adapted frame we prove a Bonnet-type existence and uniqueness theorem for almost complex surfaces in the homogeneous nearly Kähler manifold S3×S3. The proof uses a local correspondence between almost complex surfaces in S3×S3 and surfaces in R3 that satisfy the Wente H-surface...

Results in mathematics = Resultate der Mathematik, 2018, 73 (1), 24 pp. ⟨10.1007/s00025-018-0784-y⟩. ⟨hal-03148536⟩

Article dans une revue

Radiative heating of a glass plate: the semi-discrete problem

Luc Paquet

In a preceding paper (MSIA, 2012), we have studied the radiative heating of a glass plate. We have proved existence and uniqueness of the solution. Here, we want to study the semi-discrete problem and to prove a priori error estimates. Previously, in that purpose, we have to study the regularity of...

Afrika Matematika, 2018, 29 (1-2), pp.295-330. ⟨10.1007/s13370-018-0542-z⟩. ⟨hal-03212551⟩

Article dans une revue

Comparison of Numerical Error Estimators for Eddy-Current Problems Solved by FEM

R. Tittarelli, Y. Le Menach, F. Piriou, Emmanuel Creusé, Serge Nicaise, J.-P. Ducreux

In the domain of field computation with the finite-element method, choosing the mesh refinement is an important step to obtain an accurate solution. In order to evaluate the quality of the mesh, a posteriori error estimators are frequently used. In this paper, we propose to analyze and to compare...

IEEE Transactions on Magnetics, 2018, 54 (3), pp.1-4. ⟨10.1109/TMAG.2017.2736601⟩. ⟨hal-01947267⟩

Article dans une revue

Resonantly pumped eye-safe Er 3+ : YAG SPS-HIP ceramic laser

S. Bigotta, L. Galecki, Aurelien Katz, Judith Böhmler, Sébastien Lemonnier, Elodie Barraud, Anne Leriche, M. Eichhorn

We report for the first time laser action in resonantly-pumped transparent polycrystalline Er3+:YAG ceramic developed through a 2-step approach combining spark plasma sintering and HIP post treatment. Microstructural and spectroscopic properties, as well as the laser performance of large scale 0....

Optics Express, 2018, 26 (3), 8 p. ⟨10.1364/OE.26.003435⟩. ⟨hal-03477158⟩

Article dans une revue

Processing and Characterization of Polyamide/Lead Zirconium Titanate Composite for Sensing and Actuating Applications

Rida Farhan, Mohamed Rguiti, Adil Eddiai, M’hammed Mazroui, Mounir Meddad, Christian Courtois

Piezoelectric composites made from at low percentage of lead zirconium titanate (PZT) particles as filler and a polyamide-6 as the matrix were prepared by solutions casting and studied for their piezoelectric, dielectric, mechanical and structural properties. It was found that the incorporation of...

Sensor letters, 2018, 16 (2), pp.151-156. ⟨10.1166/sl.2018.3928⟩. ⟨hal-03477008⟩

Article dans une revue

Effect of fillers size on the dielectric and piezoelectric characteristics of a piezoelectric composite

Sarah Aboubakr, Abdelowahed Hajjaji, Mohamed Rguiti, Khalil Benkhouja, Christian Courtois, Y. Boughaleb

Recent trends in electromechanical conversion using alternative materials, have demonstrated the advantages of using piezoelectric composites for energy generation. There have been several papers on ceramic/polymer composites in which the fillers have high piezoelectric constant. Basically, the...

European Physical Journal: Applied Physics, 2018, 81 (2), pp.20901. ⟨10.1051/epjap/2018170204⟩. ⟨hal-03478740⟩

Article dans une revue

Influence of the w/c ratio on the hydration process of a magnesium phosphate cement and on its retardation by boric acid

Hugo Lahalle, Céline Cau Dit Coumes, Cyrille Mercier, David Lambertin, Céline Cannes, Sylvie Delpech, sandrine Gauffinet

Magnesium potassium phosphate cements (MKPCs) are prepared using calcined magnesia (MgO) and an acidic solution of potassium dihydrogen phosphate (KH2PO4). Their fast setting and high heat of hydration can be problematic when large volumes of materials are produced. Boric acid (B(OH)(3)) is thus...

Cement and Concrete Research, 2018, 109, pp.159-174. ⟨10.1016/j.cemconres.2018.04.010⟩. ⟨hal-02008865⟩

Article dans une revue

Stabilization of a Drude/Vacuum Model

Serge Nicaise

We analyze the stability of a dispersive medium immersed in vacuum (with Silver–Müller boundary condition in the exterior boundary) or vice versa. The dispersive medium model corresponds to the coupling between Maxwell’s system and a first order ordinary differential equation (of parabolic type)....

Zeitschrift für Analysis und ihre Anwendungen, 2018, 37 (3), p. 349-375. ⟨10.4171/ZAA/1618⟩. ⟨hal-03164101⟩