Publications

• Article dans une revue

Translation and homothetical surfaces in Euclidean space with constant curvature

Rafael Lopez, Marilena Moruz

We study surfaces in Euclidean space which are obtained as the sum of two curves or that are graphs of the product of two functions. We consider the problem of finding all these surfaces with constant Gauss curvature. We extend the results to non-degenerate surfaces in Lorentz-Minkowski space.

Journal of the Korean Mathematical Society, 2014, 52 (3), pp.523-535. ⟨10.4134/JKMS.2015.52.3.523⟩. ⟨hal-03172983⟩

• Article dans une revue

Effects of microwave sintering on intrinsic defects concentrations in ZnO-based varistors

Faical Kharchouche, Etienne Savary, Anthony Thuault, Sylvain Marinel, Sophie d'Astorg, Mohamed Rguiti, Saâd Belkhiat, Christian Courtois, Anne Leriche

Nowadays the most important part of varistors is made from doped ZnO. The typical varistor microstructure consists in a large number of n–p–n junctions. ZnO grains are intrinsic n-type semiconductors because of the displacement of zinc atoms in interstitial positions and the formation of oxygen…

Ceramics International, 2014, 40 (8), pp.13697-13701. ⟨10.1016/j.ceramint.2014.04.142⟩. ⟨hal-02449721⟩

• Article dans une revue

Stability results for second-order evolution equations with switching time-delay

Serge Nicaise, Cristina Pignotti

We consider second-order evolution equations in an abstract setting with intermittently delayed/not-delayed damping. We give sufficient conditions for asymptotic and exponential stability, improving and generalizing our previous results from Nicaise and Pignotti (Adv Differ Equ 17:879-902, 2012).…

Journal of Dynamics and Differential Equations, 2014, 26 (3), pp.781-803. ⟨10.1007/s10884-014-9382-1⟩. ⟨hal-03166065⟩

• Article dans une revue

Improvement of the hydroxyapatite mechanical properties by direct microwave sintering in single mode cavity

Anthony Thuault, Etienne Savary, Jean-Christophe Hornez, Gérard Moreau, Michel Descamps, S. Marinel, Anne Leriche

The main purpose of this study consists in investigating the direct microwave sintering of hydroxyapatite (HA) in a single mode cavity. Firstly, stoichiometric HA powders were synthesized by a coprecipitation method from diammonium phosphate and calcium nitrate solutions and shaped by slip-casting…

Journal of the European Ceramic Society, 2014, 34 (7), pp.1865-1871. ⟨10.1016/j.jeurceramsoc.2013.12.035⟩. ⟨hal-02449723⟩

• Article dans une revue

Improvement in the predictivity of squeal simulations: Uncertainty and robustness

Thierry Tison, Arnaud Heussaff, Franck Massa, Isabelle Turpin, R.F. Nunes

The objective of this paper is to improve the predictivity of squeal simulations by introducing uncertainty and robustness concepts during simulations. Complex eigenvalue analysis is a traditional way to detect numerically the unstable modes that can be associated with extensive vibration and noise…

Journal of Sound and Vibration, 2014, 333 (15), pp.3394-3412. ⟨10.1016/j.jsv.2014.03.011⟩. ⟨hal-03184580⟩

• Article dans une revue

Diffusion processes on an interval under linear moment conditions

Delio Mugnolo, Serge Nicaise

We discuss a class of linear and nonlinear diffusion-type partial differential equations on a bounded interval and discuss the possibility of replacing the boundary conditions by certain linear conditions on the moments of order 0 (the total mass) and of another arbitrarily chosen order n. Each…

Semigroup Forum, 2014, 88 (2), pp.479-511. ⟨10.1007/s00233-013-9552-1⟩. ⟨hal-03163692⟩

• Article dans une revue

Dielectric and Impedance spectroscopy characterizations of CuO added (Na0,5Bi0,5)0.94Ba0.06TiO3 lead-free piezoelectric ceramics

N. Zidi, Ahcène Chaouchi, Sophie d'Astorg, Mohamed Rguiti, Christian Courtois

CuO was used to reduce the sintering temperature of (Na0.5Bi0.5)0.94–Ba0.06TiO3 + 0.03 wt.%Sm2O3 (named NBTS) piezoelectric ceramics. Structural/micro-structural, dielectric, and resistive properties of this composition have been studied using impedance spectroscopic method to get better…

• Article dans une revue

Spectroscopic (FT-IR, FT-Raman, 1H, 13C NMR, UV/VIS), thermogravimetric and antimicrobial studies of Ca(II), Mn(II), Cu(II), Zn(II) and Cd(II) complexes of ferulic acid

M. Kalinowska, J. Piekut, A. Bruss, Claudine Follet-Houttemane, J. Sienkiewicz-Gromiuk, R. Swislocka, Z. Rzaczynska, W. Lewandowski

The molecular structure of Mn(II), Cu(II), Zn(II), Cd(II) and Ca(II) ferulates (4-hydroxy-3-methoxycinnamates) was studied. The selected metal ferulates were synthesized. Their composition was established by means of elementary and thermogravimetric analysis. The following spectroscopic methods…

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-..], 2014, 122, pp.631-638. ⟨10.1016/j.saa.2013.11.089⟩. ⟨hal-03123009⟩

• Article dans une revue

Heteroclinics for non autonomous third order differential equations

Denis Bonheure, José Ángel Cid, Colette De Coster, Luís Sanchez

We study the existence of heteroclinics connecting the two equilibria $\pm1$ of the third order differential equation $$u'''=f(u)+p(t)u'$$ where $f$ is a continuous function such that $f(u)(u^2-1)> 0$ if $u\neq\pm1$ and $p$ is a bounded non negative function. Uniqueness is…

Topological Methods in Nonlinear Analysis, 2014, 43 (1), pp.53-68. ⟨10.12775/tmna.2014.004⟩. ⟨hal-03135614⟩

• Article dans une revue

Development of Antibacterial Polyester Fabric by Growth of ZnO Nanorods

Munir Ashraf, Frédéric Dumont, Campagne Christine, Philippe Champagne, Anne Perwuelz, Anne Leriche, Nour-Eddine Chihib

ZnO nanorods were grown on polyester fabric by hydrothermal process. The seeding of fabric to grow ZnO nanorods was necessary because they did not grow without seeding. An air plasma treatment was carried out on polyester fabric to generate polar groups which could attach ZnO seeds. ZnO nanorods…

Journal of Engineered Fibers and Fabrics, 2014, 9 (1), ⟨10.1177/155892501400900103⟩. ⟨hal-03121204⟩