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Nord-Pas-de-Calais, France

Boulenguez J.,School of Advanced Engineering Studies | Berthier S.,University Paris Diderot | Leroy F.,CNRS Interdisciplinary Center on Nanoscience in Marseille
Applied Physics A: Materials Science and Processing | Year: 2012

The iridescence of Morpho rhetenor butterfly is known to result from a photonic structure on wing scales, where multilayer interference and grating diffraction occur simultaneously. We characterize the disorder at the photonic structure length scale and at the butterfly scale. We measure the scattering pattern of the wing. Through RCWA and 1st Born approximation models, we link the different disorders to different features in the scattering patterns. © 2012 Springer-Verlag.

Gao Z.,School of Advanced Engineering Studies | Zhi C.,Japan International Center for Materials Nanoarchitectonics | Bando Y.,Japan International Center for Materials Nanoarchitectonics | Golberg D.,Japan International Center for Materials Nanoarchitectonics | Serizawa T.,Tokyo University of Science
ACS Applied Materials and Interfaces | Year: 2011

Strong and stable visible-light-emitting boron nitride nanotube (BNNT)/biomolecule nanohybrids were successfully fabricated via noncovalent functionalization of BNNTs with flavin mononucleotides (FMN). Atomic force microscopy showed excellent dispersion of the nanohybrids in aqueous solution. Infrared absorption spectroscopy revealed strong π-π stacking interactions between FMN and BNNT sidewalls. Importantly, the fluorescence spectra revealed that the nanohybrids were highly fluorescent in the visible-light spectral range. Moreover, this fluorescence had unique pH-dependent and thermally stable properties. These nanohybrids might be used to construct novel fluorescence imaging probes that function over a wide pH and temperature range. © 2011 American Chemical Society.

Genty G.,Tampere University of Technology | de Sterke C.M.,University of Sydney | Bang O.,Technical University of Denmark | Dias F.,Ecole Normale Superieure de Cachan | And 2 more authors.
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

We discuss optical rogue wave generation in terms of collisions and turbulence processes. Simulations of picosecond pulse propagation in optical fibres show rogue soliton generation from either third-order dispersion or Raman scattering independently. Simulations of rogue soliton emergence with dispersive perturbation in the long-distance limit are also presented. © 2009 Elsevier B.V.

Boulkroune B.,School of Advanced Engineering Studies | Galvez-Carrillo M.,Elia System Operator | Kinnaert M.,Free University of Colombia
IEEE Transactions on Control Systems Technology | Year: 2013

The problem of multiplicative and/or additive fault detection and isolation (FDI) in the current sensors of a doubly fed induction generator (DFIG) is considered in the presence of model uncertainty. A residual generator based on the DFIG model is proposed using the structure of the classical generalized observer scheme. However, each observer in this scheme is replaced by a robust H-/H8 fault detection filter followed by a Kalman-like observer. The latter further attenuates the effect of the modeling uncertainties on the residuals. It exploits the specific pattern induced by the balanced three-phase nature of all the electric signals. It turns out that the FDI problem then amounts to detecting an abrupt change in the mean of the residual vector in the additive fault case, or the appearance of sine waves superimposed on a white noise vector in the multiplicative fault case. A decision algorithm made of a combination of generalized likelihood ratio algorithms allows us to detect and isolate the additive and multiplicative sensor faults. The complete FDI system is tested through simulations on a controlled DFIG. © 2012 IEEE.

Libessart L.,School of Advanced Engineering Studies | Djelal C.,CNRS Civil and geo-Environmental Engineering Laboratory | De Caro P.,ENSIACET | De Caro P.,French National Institute for Agricultural Research
Construction and Building Materials | Year: 2014

The quality of the concrete facings results from the implementation of release agents and the casing surface quality. It is interesting to characterize the behaviour of release agents over the lifetime of the formwork. This study is based on the many ones test physicochemical and esthetics realized on two types of surface of formwork like on three types of applications. In complement, the ageing of the casing formwork was characterized by electrochemical spectroscopy of impedance and thanks to the correlation with the aesthetic tests will allow to find from new mechanisms to the interfaces related to the studied oil's formulations. © 2014 Elsevier Ltd. All rights reserved.

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