Publications

• Article dans une revue

Existence results for the A & φ magnetodynamic formulation of the Maxwell system

Serge Nicaise

The (Formula presented.) magnetodynamic Maxwell system given in its potential and space/time formulation is a popular model considered in the engineering community. We establish existence of strong solutions with the help of the theory of Showalter on degenerated parabolic problems; using energy…

Applicable Analysis, 2015, 94 (5), pp.863-878. ⟨10.1080/00036811.2014.905678⟩. ⟨hal-03151968⟩

• Article dans une revue

XRD, Raman and electrical studies on the (1−x)(Na0.5Bi0.5)TiO3−xBaTiO3 lead free ceramics

Hamza Lidjici, Brahim Lagoun, Mokhtar Berrahal, Mohamed Rguiti, Med Amine Hentatti, Hamadi Khemakhem

Lead-free piezoceramics (1−x)Bi0.5Na0.5TiO3–xBaTiO3 (x = 0.00, 0.03, 0.05, 0.065, 0.07, 0.08 and 0.10) have been prepared by the conventional solid reaction method and their structure and electrical properties were systematically investigated. X-ray diffraction analysis indicates that a solid…

Journal of Alloys and Compounds, 2015, 618, pp.643-648. ⟨10.1016/j.jallcom.2014.08.161⟩. ⟨hal-04280963⟩

• Article dans une revue

Optimal control of magnetic fields in flow measurement

Serge Nicaise, Simon Stingelin, Fredi Tröltzsch

Optimal control problems are considered for transient magnetization processes arising from electromagnetic flow measurement. The magnetic fields are generated by an induction coil and are defined in 3D spatial domains that include electrically conducting and nonconducting regions. Taking the…

Discrete and Continuous Dynamical Systems - Series S, 2015, 8 (3), pp.579-605. ⟨10.3934/dcdss.2015.8.579⟩. ⟨hal-03142630⟩

• Article dans une revue

Dispersive effects and high frequency behaviour for the Schr¨odinger equation in star-shaped networks

Felix Ali Mehmeti, Kaïs Ammari, Serge Nicaise

We prove the time decay estimates L1(R)→L∞(R), where R is an infinite star-shaped network, for the Schrödinger group eit(−d2dx2+V) for real-valued potentials V satisfying some regularity and decay assumptions. Further we show that the solution for initial conditions with a lower cutoff frequency…

Portugaliae Mathematica, 2015, 72 (4), pp.309-355. ⟨10.4171/PM/1970⟩. ⟨hal-03138323⟩

• Article dans une revue

Approximation of the two-dimensional Dirichlet problem by continuous and discrete problems on one-dimensional networks

Maryse Bourlard-Jospin, Serge Nicaise, Juliette Venel

We show that the solution of the two-dimensional Dirichlet problem set in a plane domain is the limit of the solutions of similar problems set on a sequence of one-dimensional networks as their size goes to zero. Roughly speaking this means that a membrane can be seen as the limit of rackets made…

Confluentes Mathematici, 2015, 7 (1), pp.13-33. ⟨10.5802/cml.16⟩. ⟨hal-03135676⟩

• Article dans une revue

Microwave sintering of Ge-doped In2O3 thermoelectric ceramics prepared by slip casting process

E. Combe, E. Guilmeau, Etienne Savary, S. Marinel, R. Cloots, R. Funahashi, F. Boschini

Ge doped In2O3 bulks were prepared by dry uniaxial compaction or slip casting shaping methods followed by a conventional or microwave sintering. Density of slip casted Ge doped In2O3 samples after conventional sintering reaches bulk density close to the theoretical one thanks to an optimized…

Journal of the European Ceramic Society, 2015, 35 (1), pp.145-151. ⟨10.1016/j.jeurceramsoc.2014.08.012⟩. ⟨hal-02184171⟩

• Proceedings/Recueil des communications

Analysis and geometry

Ali Baklouti, Aziz El Kacimi Alaoui, Sadok Kallel, Nordine Mir

MIMS-GGTM (Tunis ; 2014), Mar 2014, Tunis, Tunisia. 127, Springer, pp.VIII-266, 2015, Springer proceedings in mathematics & statistics, 978-3-319-17442-6. ⟨hal-03234788⟩

• Communication dans un congrès

Thick mesh reconstruction from scattered cloud

Thierry Bay, R. Raffin

International Conference on Computer Graphics, Visualization, Computer Vision and Image Processing, 2015, Las Palmas de Gran Canarias, Spain. pp.187-196. ⟨hal-03131117⟩

• Thèse

Study of the stability of a certain systems of coupled wave equations and of the Rayleigh beam equation on bounded and unbounded domains, Étude de la stabilité de quelques systèmes d'équations des ondes couplées sur des domaines bornés et non bornés

Maya Bassam

The thesis is driven mainly on indirect stabilization system of two coupled wave equations and the boundary stabilization of Rayleigh beam equation. In the case of stabilization of a coupled wave equations, the Control is introduced into the system directly on the edge of the field of a single…, La thèse est portée essentiellement sur la stabilisation indirecte d’un système de deux équations des ondes couplées et sur la stabilisation frontière de poutre de Rayleigh.Dans le cas de la stabilisation d’un système d’équations d’onde couplées, le contrôle est introduit dans le système…

General Mathematics [math.GM]. Université de Valenciennes et du Hainaut-Cambresis; Université Libanaise, 2014. English. ⟨NNT : 2014VALE0034⟩. ⟨tel-01171615⟩

• Article dans une revue

Ferroelectrics, piezoelectric, and Impedance spectroscopy characterizations of CuO doped (Na_0.52K_0.44)(Nb_0.9Sb_0.06)O₃–0.04LiTaO₃ lead free ceramics

M. Saidi, K. Khalfaoui, Ahcène Chaouchi, Sophie d'Astorg, Mohamed Rguiti, Christian Courtois

CuO was used to reduce the sintering temperature of (Na0.52 K0.44)(Nb0.9 Sb0.06)O3 –0.04LiTaO3 (NKNSLT) piezoelectric ceramics. XRD analysis reveals the formation of single phase perovskite structure. SEM has been used to investigate the grain morphology of the material. Impedance plots have been…