ORBi http://orbi.ulg.ac.be The ORBi institutional repository system captures, stores, indexes, preserves, and distributes digital research material. ORBi search engine Search this channel search http://orbi.ulg.ac.be/simple-search Le potentiel des blogues et des réseaux numériques dans l'apprentissage d'une langue étrangère http://hdl.handle.net/2268/202018 Title: Le potentiel des blogues et des réseaux numériques dans l'apprentissage d'une langue étrangère <br/> <br/>Author, co-author: Vintila, Elena-Georgiana <br/> <br/>Abstract: We selected two French foreign language textbooks published in Romania under the Ministry of Education in 2004 and 2005 by the same publishing house and we will analyze the modality of presentation of grammar points offered by textbooks and selected blogs. For this analysis, we will focus on: the appearance of textbooks, respectively blogs, the presentation of the grammar point set analysis, types and number of exercises. In addition, we will try to see what socio-cultural values ​​are highlighted by the authors and how bloggers alter through publications.; Nous avons sélectionné deux manuels de français langue étrangère édités en Roumanie sous l’égide du Ministère de l’Éducation en 2004 et 2005 par la même Maison d’Édition et nous allons analyser la modalité de présentation des points de grammaire proposés par les manuels et les blogues choisis. Pour cette analyse, nous allons nous pencher sur : l’aspect des manuels, respectivement des blogues, la présentation du point de grammaire mis en analyse, les types et le nombre des exercices. En plus, nous allons essayer de voir quelles valeurs socioculturelles sont mises en avant par les auteurs et comment les blogueurs les modifient grâce aux publications. Isotopic turnover and trophic fractionation in two species of European freshwater fishes: an experimental approach http://hdl.handle.net/2268/202017 Title: Isotopic turnover and trophic fractionation in two species of European freshwater fishes: an experimental approach <br/> <br/>Author, co-author: Latli, Adrien; Sturaro, Nicolas; Michel, Loïc; Dejardin, Nelson; Defour, Jean; Lepoint, Gilles; Kestemont, Patrick Supprimer la Communauté française ? Quelles perspectives pour le paysage institutionnel francophone ? http://hdl.handle.net/2268/202016 Title: Supprimer la Communauté française ? Quelles perspectives pour le paysage institutionnel francophone ? <br/> <br/>Author, co-author: Behrendt, Christian <br/> <br/>Abstract: Conférence donnée à l'invitation de l'Union des entreprises à profit social (UNIPSO), à Bruxelles, Centre "Le Botanique", le 23 septembre 2016 L'âge de début de l'obligation scolaire http://hdl.handle.net/2268/202015 Title: L'âge de début de l'obligation scolaire <br/> <br/>Author, co-author: Behrendt, Christian Coupled Boltzmann Equation Solver: Effects of the Electron-Phonon Interaction on the Transport Coefficients http://hdl.handle.net/2268/202014 Title: Coupled Boltzmann Equation Solver: Effects of the Electron-Phonon Interaction on the Transport Coefficients <br/> <br/>Author, co-author: Pike, Nicholas; Dewandre, Antoine; Verstraete, Matthieu <br/> <br/>Abstract: Recent experimental and theoretical calculations point to a complex interplay between the electron and phonon baths in a wide variety of materials [1,2]. We propose a method of coupling the Boltzmann equations for the electron and phonon baths within the relaxation time approximation which we use to calculate the thermoelectric transport coefficients. Our model for the coupled Boltzmann Equation solver includes analytic models, including ${\bf k \cdot p}$ Hamiltonians and tight-binding Hamiltonians, for both the electron and phonon energies and analytic models for the electron and phonon relaxation mechanisms. From these calculations we hope to better understand the role and interplay of electron-phonon and phonon-phonon interactions on the thermoelectric transport coefficients. [1] - Phys. Rev. Lett. ${\bf 114}$, 115901 (2015). [2] - PNAS ${\bf 112}$, 14777-14782 (2015). Detection of nitrogen stress on winter wheat by multispectral machine vision http://hdl.handle.net/2268/202013 Title: Detection of nitrogen stress on winter wheat by multispectral machine vision <br/> <br/>Author, co-author: Marlier, Guillaume; Gritten, Fanny; Leemans, Vincent; Dumont, Benjamin; Destain, Marie-France; Bodson, Bernard; Goffart, Jean-Pierre; Mercatoris, Benoît <br/> <br/>Abstract: Hand-held sensors (SPAD meter, N-Tester, …) used for detecting the leaves nitrogen concentration (Nc) present several drawbacks. The nitrogen concentration is gained by an indirect way through the chlorophyll concentration and the leaves have to be fixed in a defined position for the measurements. These drawbacks could be overcome by an imaging device that measures the canopy reflectance. Hence, the objective of the paper is to analyse the potential of multispectral imaging for detecting nitrogen concentration. The tests were carried out on parcels submitted to nitrogen inputs varying from 0 to 180 kg N.ha-1. Reference Nc measurements were obtained by the Kjeldahl method and a Hydro N-Tester (Yara). The developed imaging system comprised a CMOS camera and a set of 22 interference filters ranging from 450 to 950 nm mounted on a wheel steered by a stepper motor. The image acquisition and the motor rotation were controlled by a program written in C++. The crop was imaged vertically at one meter height. The raw images presented 1280×1024 pixels covering an area of approximately 0.25 m² and were recorded with a 12-bit luminance resolution. To deal with the natural irradiance variability of the scene, a white reference was used and the integration time was automatically adjusted for each image. The image treatment included the segmentation of Photosynthetically Active Leaves (PAL) by using Bayes theorem and the computation of the mean PAL reflectance after correction of background and illumination fluctuations. Nc was estimated on the basis of the 22 filters by the Partial Least Square (PLS) method and by four filters selected by the Best Subset Selection (BSS) method. In comparison with the Kjeldahl method, the estimation of Nc by means of the Hydro N-Tester, the PLS method and the BSS method (filters 600-80, 950-100, 650-40 and 450-80 nm) gave determination coefficients equal to 0.53, 0.63, and 0.62, respectively. This indicated that the full multi-spectral approach gave significantly better Nc estimation than a portable device and suggested that a camera equipped with four filters would give similar results. Is the observer effect significant in vegetation assessment of restored metallicolous grassland? http://hdl.handle.net/2268/202012 Title: Is the observer effect significant in vegetation assessment of restored metallicolous grassland? <br/> <br/>Author, co-author: Boisson, Sylvain; Mahy, Grégory <br/> <br/>Abstract: Projects that prospects habitat restoration require protocols of vegetation assessment to monitor the evolution of the restored ecosystems over time. In most cases, multiple assessors are needed and some studies have shown that the variability among observer can be significant. In the context of tropical grassland, few studies quantified the impact of the observer on the results, reducing the capacity to replicate conclusions, and, therefore to plan restoration strategies at large scale. This study aims to quantify the variation among observers using two phytosociological methods on restored metallicolous grassland and to test whether variation in the assessment could involve the conclusions of the vegetation assessment. Four observers were selected to perform monitoring of quadrats in two distinct habitats identified in four restored ecosystems. All observers sampled seven metrics based on phytosociological methods and two of them also performed a complete vegetation sampling of the quadrat, including species identification and cover in quadrat. For metrics based on cover, variation of measure exists among the observers. For metrics based on counting, no variation is highlighted and the observers are able to distinguish and identify species. These results emphasize that a same method could lead to distinct results according to observer and, in restoration projects, it is crucial to ensure a correct transfer of protocols of vegetation assessment in order to reproduce equally the method. Méthodologie de la recherche documentaire juridique http://hdl.handle.net/2268/202011 Title: Méthodologie de la recherche documentaire juridique <br/> <br/>Author, co-author: Fructus, Isabelle; Zians, Audrey; Adréani, Guillaume; Cottin, Stéphane; Sibony, Anne-Lise Recherche documentaire juridique : méthodologie http://hdl.handle.net/2268/202010 Title: Recherche documentaire juridique : méthodologie <br/> <br/>Author, co-author: Fructus, Isabelle; Zians, Audrey; Adréani, Guillaume; Cottin, Stéphane Environmentally friendly bio-based non-isocyanate (NIPU) coatings for corrosion protection of metal surfaces http://hdl.handle.net/2268/202009 Title: Environmentally friendly bio-based non-isocyanate (NIPU) coatings for corrosion protection of metal surfaces <br/> <br/>Author, co-author: Panchireddy, Satyannarayana; Grignard, Bruno; Thomassin, Jean-Michel; Renaud, Alexis; Olivier, Marjorie; Poorteman, Marc; Detrembleur, Christophe; Jérôme, Christine <br/> <br/>Commentary: This poster was presented by Satyannarayana Panchireddy Nonlinear vibration analysis of the SmallSat spacecraft: From identification to design http://hdl.handle.net/2268/202008 Title: Nonlinear vibration analysis of the SmallSat spacecraft: From identification to design <br/> <br/>Author, co-author: Detroux, Thibaut; Noël, Jean-Philippe; Masset, Luc; Kerschen, Gaëtan <br/> <br/>Abstract: The objective of the present contribution is to introduce nonlinear experimental and numerical tools and methods applicable to real-life structures. The study is illustrated using the SmallSat spacecraft developed by Airbus Defence and Space, which possesses several localized nonlinearities. The computation of nonlinear normal modes and bifurcations reveals that the satellite possesses complex dynamics including modal interactions, quasiperiodic oscillations and isolated resonances. Quelles perspectives d'avenir pour le Cifen ? http://hdl.handle.net/2268/202007 Title: Quelles perspectives d'avenir pour le Cifen ? <br/> <br/>Author, co-author: Simons, Germain <br/> <br/>Abstract: Dans le cadre de la table ronde portant sur les 20 ans du Cifen (28 août 2015), le président actuel du Centre, G. Simons, a évoqué quelques perspectives pour le centre. PAI Annual Meeting http://hdl.handle.net/2268/202006 Title: PAI Annual Meeting <br/> <br/>Author, co-author: Ouhib, Farid; Aqil, Abdelhafid; Dirani, Ali; Glinel, Karine; Nysten, Bernard; Alain M., Jonas; Jérôme, Christine; Detrembleur, Christophe <br/> <br/>Commentary: This poster was presented by Farid Ouhib On the relations between nonlinear resonances and nonlinear normal modes http://hdl.handle.net/2268/202005 Title: On the relations between nonlinear resonances and nonlinear normal modes <br/> <br/>Author, co-author: Detroux, Thibaut; Noël, Jean-Philippe; Kerschen, Gaëtan Le Cifen actuel en cinq points http://hdl.handle.net/2268/202004 Title: Le Cifen actuel en cinq points <br/> <br/>Author, co-author: Simons, Germain <br/> <br/>Abstract: Dans le cadre de la table ronde sur les 20 ans du Cifen, G. Simons, président actuel du Centre interfacultaire de formation des enseignants (Cifen) de l'ULg, a présenté le centre en 5 grands points. The FNSI method for experimental identification of nonlinear vibrating structures http://hdl.handle.net/2268/202003 Title: The FNSI method for experimental identification of nonlinear vibrating structures <br/> <br/>Author, co-author: Noël, Jean-Philippe; Kerschen, Gaëtan Iron oxide nitrogen doped porous carbon as nanostructured electrode composites for lithium ion batteries http://hdl.handle.net/2268/202002 Title: Iron oxide nitrogen doped porous carbon as nanostructured electrode composites for lithium ion batteries <br/> <br/>Author, co-author: Alkarmo, Walid; Ouhib, Farid; Aqil, Abdelhafid; Thomassin, Jean-Michel; Gong, Jiang; Ambrogi, Martina; Vertruyen, Bénédicte; Yuan, Jiayin; Detrembleur, Christophe; Jérôme, Christine <br/> <br/>Commentary: This poster was presented by Walid Alkarmo Les 20 ans du Cifen : bienvenue http://hdl.handle.net/2268/202001 Title: Les 20 ans du Cifen : bienvenue <br/> <br/>Author, co-author: Simons, Germain <br/> <br/>Abstract: Mot de bienvenue aux participants à la cérémonie des 20 ans d'existence officielle du Centre interfacultaire de formation des enseignants (Cifen) de l'ULg Dynamics of ligands on gold surface to obtain Janus nanoclusters: A theoretical and experimental investigation http://hdl.handle.net/2268/202000 Title: Dynamics of ligands on gold surface to obtain Janus nanoclusters: A theoretical and experimental investigation <br/> <br/>Author, co-author: Lugo Preciado, Jesús Gustavo <br/> <br/>Abstract: We performed a joint computational – experimental investigation of the dynamics of ligand exchange on gold nanoclusters (GNC) surface with the aim to understand how to control the structural and optical properties of GNC through the design of their ligand shell. Our computational studies were carried out in the framework of the Kohn – Sham implementation of density functional theory in quantum chemistry. We analyzed the main features of UV – Vis spectra computed at the TD – DFT / CAM – B3LYP level for the Au13, Au25, and Au28 metallic cores protected by thiolate, chloride, and phosphine ligands. Our results show that it is possible to tune the energy of the lowest absorption band of gold clusters by ligand shell engineering in order to control the charge redistribution between ligand shell and metallic core. In parallel we synthesized a set of Au25(ATP)x(TP)18 – x clusters with different ATP/TP ratios using an adapted Demessence protocol by combining 4ATP (4 – aminothiophenol) and TP (thiophenol) ligands. ESI – MS measurements evidence that for these mixed ligand shells the Au25 nuclearity is preserved. However, the addition of the DDT (1 – dodecanethiol) ligand in the mixture leads to nanoparticle formation. FT – IR spectroscopy confirms the absorption of two different ligands on the gold surface and SAXS shows that we have a good correlation between the distance between two clusters and the length of the ligand protecting them. Furthermore, we collaborated with the Institut Charles Gerhardt in the Université de Montpellier, France whose experimental results show that several n – heterocyclic carbenes (NHC) bearing different groups on the N atoms exhibit similar reactivity when protecting a gold nanosurface. The formation of the bis(NHC) AuI gold complexes is evidenced by 13C NMR. In order to complement and interpret the experimental results, we carried out a computational study of the adsorption of a single NHC on Au38 which acts as a model for the gold surface, as well as of the fully NHC ligated Au38 cluster. The joint experimental – theoretical study, in particular the comparison between computed and 13C NMR spectra allows proposing a possible mechanism explaining the formation of [NHC – Au – NHC]+ complexes and the erosion experienced by the nanoparticle. Finally, we carried out a comparison of the mode of binding and the structural and optical properties of the fully ligated PH3 and NHC GNC with metallic cores of different nuclearities. Our computations show that the Au – P bond is weaker than the Au – NHC one. Additionally, our study confirms that the ligand – to – metal charge transfer is an important parameter for understanding the electronic transitions and the UV – Vis spectra in these clusters. Our computations on the PH3 – Au38 set of complexes show that there is a site selectivity for the reactivity for the PH3 interacting on the Au38 surface which allows predicting where the PH3 is likely to be adsorbed. This selectivity is not observed in the case of the binding of a single NHC ligand on the surface of the Au38 cluster. A nonlinear state-space approach to hysteresis identification http://hdl.handle.net/2268/201999 Title: A nonlinear state-space approach to hysteresis identification <br/> <br/>Author, co-author: Noël, Jean-Philippe; Esfahani, Alireza; Kerschen, Gaëtan; Schoukens, Johan <br/> <br/>Abstract: Most studies tackling hysteresis identification in the technical literature follow white-box approaches, i.e. they rely on the assumption that measured data obey a specific hysteretic model. Such an assumption may be a hard requirement to handle in real applications, since hysteresis is a highly individualistic nonlinear behaviour. The present paper adopts a black-box approach based on nonlinear state-space models to identify hysteresis dynamics. This approach is shown to provide a general framework to hysteresis identification, featuring flexibility and parsimony of representation. Nonlinear model terms are constructed as a multivariate polynomial in the state variables, and parameter estimation is performed by minimising weighted least-squares cost functions. Technical issues, including the selection of the model order and the polynomial degree, are discussed, and model validation is achieved in both broadband and sine conditions. The study is carried out numerically by exploiting synthetic data generated via the Bouc-Wen equations.
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