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See detailIngénieries de formation innovantes - quelles place et fonctions pour NeopassSup ?
Poumay, Marianne ULg

Conference (2017, February 08)

Dans le contexte de l'enseignement supérieur et à l'occasion du lancement de la plateforme NéopassSup, cette communication abordait l'intérêt pédagogique d'un tel outil au service du développement ... [more ▼]

Dans le contexte de l'enseignement supérieur et à l'occasion du lancement de la plateforme NéopassSup, cette communication abordait l'intérêt pédagogique d'un tel outil au service du développement professionnel des enseignants du supérieur. Elle imaginait les usages possibles de l'outil, sur la base d'activités déjà en cours. Elle anticipait ensuite les facteurs de succès de ces usages et se clôturait sur quelques réflexions, soulignant notamment l'importance de l'accompagnement des enseignants dans ces démarches de formation et de développement professionnel. [less ▲]

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See detailThe Role of Super-Atom Molecular Orbitals in Doped Fullerenes in a Femtosecond Intense Laser Field
Xiong, Hui; Mignolet, Benoît ULg; Fang, Li et al

in Scientific Reports (2017)

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See detailLe latin et le grec de Michel Dubuisson : quelques réflexions sur une œuvre consacrée au bilinguisme dans l’Antiquité gréco-romaine
Ioannidopoulos, Grégory ULg

Conference (2017, February 08)

Dans son ouvrage bien connu consacré au « Latin de Polybe », M. Dubuisson s’efforça de relever de façon exhaustive les traits de langue qui trahissaient l’influence du latin chez l’historien grec. Mais au ... [more ▼]

Dans son ouvrage bien connu consacré au « Latin de Polybe », M. Dubuisson s’efforça de relever de façon exhaustive les traits de langue qui trahissaient l’influence du latin chez l’historien grec. Mais au-delà, il s’agissait également de tirer toutes les conséquences historiques des conclusions tirées de l’analyse philologique, afin de mieux comprendre l’œuvre de Polybe. M. Dubuisson fut ainsi l’un des promoteurs d’une approche plus qualitative du bilinguisme gréco-latin, approche qu’il élargit ensuite à d’autres champs d’étude. Ce faisant, il contribua à l’affinement de nos connaissances sur les rapports que Rome entretenait avec la Grèce et sa langue, et vice-versa. Et sa démarche fut féconde, tant à l’Université de Liège, où elle s’enracinait dans une tradition solide, qu’à l’extérieur. [less ▲]

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See detailRestauration de papyrus et techniques d'imagerie au CEDOPAL
Carlig, Nathan ULg

Conference (2017, February 08)

Si le Centre de documentation de papyrologie littéraire (CEDOPAL) de l’Université de Liège est propriétaire, depuis 1954, d’une collection de vingt papyrus, dix-neuf grecs et un copte, datés du Ier au ... [more ▼]

Si le Centre de documentation de papyrologie littéraire (CEDOPAL) de l’Université de Liège est propriétaire, depuis 1954, d’une collection de vingt papyrus, dix-neuf grecs et un copte, datés du Ier au VIIe siècle, il est également dépositaire d’une collection privée liégeoise de papyrus grecs, coptes et démotiques, actuellement en cours de restauration. Après avoir présenté le papyrus comme support d’écriture et ses caractéristiques, nous détaillerons les techniques de restauration et d’imagerie mises en œuvre lors de la restauration de la collection de papyrus du CEDOPAL et de celle de la collection privée et nous mettrons en avant les résultats obtenus et les perspectives d’analyses futures. [less ▲]

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See detailSurface behavior of soluble protein fractions from Spirulina platensis
Barka, Abakoura; Blecker, Christophe ULg

Scientific conference (2017, February 07)

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See detailDesign optimization of Rankine cycle systems for waste heat recovery from passenger car engines
Lemort, Vincent ULg; Legros, Arnaud; Dumont, Olivier ULg et al

Conference (2017, February 07)

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See detailHow to extract the oscillating components of a signal? A wavelet-based approach compared to the Empirical Mode Decomposition
Deliège, Adrien ULg

Scientific conference (2017, February 07)

Researchers are often confronted with time series that display pseudo-periodic tendencies with time-varying amplitudes and frequencies. In that framework, a classic Fourier analysis of the data may be of ... [more ▼]

Researchers are often confronted with time series that display pseudo-periodic tendencies with time-varying amplitudes and frequencies. In that framework, a classic Fourier analysis of the data may be of limited interest, especially if the objective is to derive components from the signal that capture the non-stationary behaviour of the oscillating factors. In this talk, we present two powerful tools designed to extract amplitude modulated-frequency modulated (AM-FM) components from a given signal. The first one is the renowned Empirical Mode Decomposition (EMD); we explain the technique, its main benefits, limitations and major practical uses. Then, we introduce the continuous wavelet transform and the equations that justify its relevance in the present context. We propose an algorithm based on the wavelet-induced time-frequency representation of a signal to extract its main components. The performances of this method are compared with the EMD on various AM-FM signals exhibiting different particularities. After briefly broaching the problem of edge effects, we investigate whether the wavelet-based procedure can be used in the domain of time series forecasting. For that purpose, we study the El Nino Southern Oscillation index and develop a model aimed at predicting the long-term trends of the signal. Its predictive skills are tested in several ways and exposed in the final part of the talk. [less ▲]

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See detailComparison of two laboratory-scale ensiling methods to assess effect of reducing sugars
Herremans, Sophie ULg; Decruyenaere, Virginie; Beckers, Yves ULg et al

Poster (2017, February 07)

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See detailThe prosumers and the grid
Gautier, Axel ULg; Jacqmin, Julien ULg; poudou, jean-christophe

Conference (2017, February 07)

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See detailLe jeu vidéo à l'université? Recherches sur un objet culturel
Dozo, Björn-Olav ULg

Conference given outside the academic context (2017)

Detailed reference viewed: 51 (1 ULg)
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See detailQuantification of natural estrogens in aqueous matrices as pyridine-3-sulfonyl derivatives by UHPLC-ESI-MS/MS
Glineur, Alex ULg; Ronkart, Sébastien; Nott, Kathérine et al

Conference (2017, February 07)

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic ... [more ▼]

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic wildlife and also humans even at extremely low concentrations. For this reason, these molecules have been included in a watch list from the European Commission regarding emerging aquatic pollutants. The maximum detection limits are set at 0.035 and 0.40 ng/L for EE2 and E1, E2 respectively. Reaching such low levels of concentration of estrogenic compounds is a challenge, even using state-of-the-art analytical methods. In this study, we developed a UHPLC-ESI-MS/MS method allowing the quantification of E1, E2, E3 and EE2 residues in aqueous matrices. Studies commonly used ESI in negative mode albeit the poor ionization efficiency of native estrogenic compounds in this mode. In this study, the molecules were derivatised using a sulfonyl chloride reagent (pyridine-3-sulfonyl, P-3-S). The resulting response in the positive mode was significantly enhanced. Similarly to other dansyl derivatives, the product ion spectra of the P-3-S derivatives indicate ions originating from the derivatization reagent moiety. Moreover, several other ions were included in the product ion spectra of the P-3-S derivatives. Their specificity was assessed by a qualitative approach implying the analysis of different types of water samples (groundwater, surface water). Some product ions were found to be noticeably better for quantification and confirmation of the analytes. The developed analytical method was validated according to the NF T90-210 norm which is suitable to assess the performances of a method in the water quality field. The limits of quantification were 0.04, 0.05, 0.10 and 0.02 ng/L in groundwater and 0.89, 0.79,4.42 and 0.29 ng/L in surface water for E1, E2, E3 and EE2 respectively. [less ▲]

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See detailLogging impact on biodiversity in Central Africa
Doucet, Jean-Louis ULg

Conference (2017, February 07)

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See detailPerineuronal nets and vocal plasticity in songbirds: a proposed mechanism to explain the difference between closed-ended and open-ended learning
Cornez, Gilles ULg; Madison, F.N.; Van der Linden, A. et al

in Developmental Neurobiology (2017)

Perineuronal nets (PNN) are aggregations of chondroitin sulfate proteoglycans surrounding the soma and proximal processes of neurons, mostly GABAergic interneurons expressing parvalbumin. They limit the ... [more ▼]

Perineuronal nets (PNN) are aggregations of chondroitin sulfate proteoglycans surrounding the soma and proximal processes of neurons, mostly GABAergic interneurons expressing parvalbumin. They limit the plasticity of their afferent synaptic connections. In zebra finches PNN develop in an experience-dependent manner in the song control nuclei HVC and RA (nucleus robustus arcopallialis) when young birds crystallize their song. Because songbird species that are open-ended learners tend to recapitulate each year the different phases of song learning until their song crystallizes at the beginning of the breeding season, we tested whether seasonal changes in PNN expression would be found in the song control nuclei of a seasonally breeding species such as the European starling. Only minimal changes in PNN densities and total number of cells surrounded by PNN were detected. However, comparison of the density of PNN and of PNN surrounding parvalbumin-positive cells revealed that these structures are far less numerous in starlings that show extensive adult vocal plasticity, including learning of new songs throughout the year, than in the closed-ended learner zebra finches. Canaries that also display some vocal plasticity across season but were never formally shown to learn new songs in adulthood were intermediate in this respect. Together these data suggest that establishment of PNN around parvalbumin-positive neurons in song control nuclei has diverged during evolution to control the different learning capacities observed in songbird species. This differential expression of PNN in different songbird species could represent a key cellular mechanism mediating species variation between closed-ended and open-ended learning strategies. [less ▲]

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See detailPassive (re)translations and active power struggles in "Book of Longing" (Leonard Cohen)
Mus, Francis ULg

Conference (2017, February 07)

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See detailInteractive family dynamics and Non-Suicidal Self-Injury in psychiatric adolescent patients: a single case study
Gatta, Michela; Miscioscia, Marina ULg; Sisti, Marta et al

in Frontiers in Psychology (2017), 8(46),

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See detailVieillir avec ou sans maladie d'Alzheimer dans notre société actuelle
Adam, Stéphane ULg

Conference given outside the academic context (2017)

Detailed reference viewed: 31 (1 ULg)
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See detailAERODYNAMIC AND AEROELASTIC MODELING OF HORIZONTAL AXIS WIND TURBINES USING PANEL METHODS
Prasad, Chandra Shekhar ULg

Doctoral thesis (2017)

Wind energy is one of the most reliable renewable energy sources and constitutes a viable alternative to fossil and nuclear fuels for the generation of electricity. Over the last couple of decades the ... [more ▼]

Wind energy is one of the most reliable renewable energy sources and constitutes a viable alternative to fossil and nuclear fuels for the generation of electricity. Over the last couple of decades the increasing demand for wind energy has resulted in increasingly large and sophisticated wind turbines. Accurate but efficient aerodynamic and aeroelastic modelling at the design stage has become a key issue. The surface panel and vortex lattice methods are efficient aerodynamic modelling tools that are routinely employed in design calculations by the aerospace industry. They constitute a good compromise between fidelity and computational cost in the preliminary design and optimization phase. However, these approaches have not been widely adopted for wind turbine modelling due to their inability to represent separated flow. The main objective of this thesis is the development of a 3D unsteady viscous-inviscid interaction technique that couples panel methods to a boundary layer solution and can be used to model separated flow over the blades of a wind turbine rotor. The technique is based on a quasi-3D, quasi-steady integral boundary layer solution, coupled to a 3D unsteady surface panel method by means of a two-way interaction scheme. The boundary layer solution results in an estimate of the separation line on the suction surface of the blade. A separated shear layer made up of doublet panels is shed from this line and allowed to propagate freely at the local flow velocity, exactly like the wake shed at the trailing edge. Aerodynamic pressure and load predictions obtained from this method are validated through comparison to experimental measurements from the NREL phase VI wind turbine. The thesis also describes the development of a complete methodology for the unsteady aeroelastic and aeroservoelastic modeling of horizontal axis wind turbines at the design stage. The methodology is based on the implementation of unsteady aerodynamic modeling, advanced control strategies and nonlinear finite element calculations in the Siemens LMS Samcef for Wind Turbines design package. The aerodynamic modelling is carried out by means of the unsteady Vortex Lattice Method. The complete methodology is used to perform full aeroservoelastic simulations of a 2MW prototype wind turbine model. [less ▲]

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See detailNumerical study of Balearic meteotsunami generation and propagation under synthetic gravity wave forcing
Matjaž, Ličer; Mourre, Baptiste; Troupin, Charles ULg et al

in Ocean Modelling (2017), 111

Detailed reference viewed: 14 (0 ULg)