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See detailResidential heat pump as flexible load for direct control service with parametrized duration and rebound effect
Georges, Emeline ULg; Cornélusse, Bertrand ULg; Ernst, Damien ULg et al

in Applied Energy (2017), 187

This paper addresses the problem of an aggregator controlling residential heat pumps to offer a direct control flexibility service. The service consists of a power modulation, upward or downward, that is ... [more ▼]

This paper addresses the problem of an aggregator controlling residential heat pumps to offer a direct control flexibility service. The service consists of a power modulation, upward or downward, that is activated at a given time period over a fixed number of periods. The service modulation is relative to an optimized baseline that minimizes the energy costs. The load modulation is directly followed by a constrained rebound effect, consisting of a delay time with no deviations from the baseline consumption and a payback time to return to the baseline state. The potential amount of modulation and the constrained rebound effect are computed by solving mixed integer linear problems. Within these problems, the thermal behavior of the building is modeled by an equivalent thermal network made of resistances and lumped capacitances. Simulations are performed for different sets of buildings typical of the Belgian residential building stock and are presented in terms of achievable modulation amplitude, deviations from the baseline and associated costs. A cluster of one hundred ideal buildings, corresponding to retrofitted freestanding houses, is then chosen to investigate the influence of each parameter defined within the service. Results show that with a set of one hundred heat pumps, a load aggregator could expect to harvest mean modulation amplitudes of up to 138 kW for an upward modulation and up to 51 kW for a downward modulation. The obtained values strongly depend on the proposed flexibility service. For example, they can decrease down to 2.6 kW and 0.4 kW, respectively, if no rebound effect is allowed. [less ▲]

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See detailMegaloolithid dinosaur eggs: scrambled parataxonomy and nesting strategies
Jentgen, Benjamin ULg; Stein, Koen; Fischer, Valentin ULg

Poster (2017, February)

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See detailLes champs sous l’œil des satellites
Stassart, Camille; Wellens, Joost ULg

Article for general public (2017)

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See detailLa notion d’attention virtuelle dans la philosophie médiévale
Dubouclez, Olivier ULg

Scientific conference (2017, February)

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See detailPrendre soin du sauvage. Le devenir de la nature pour métier.
Denayer, Dorothée ULg

Conference (2017, February)

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See detailNew data on the Mesozoic radiation of chelonioids
Scavezzoni, Isaure ULg; Fischer, Valentin ULg

Poster (2017, February)

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs ... [more ▼]

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs, curved limbs, anapsid skull exempt of temporal fenestrae) and ecology has often obscured their relationships and, hence, their evolutionary history, notably in marine turtles (chelonioids). Modern chelonioids are divided in two clades (i. e. : shoft-shelled turtles and hard-shelled turtles) supported by distinct morphological and embryological characters. Their origin is traced back up to the Cretaceous, along with a series of extinct forms, many of which being collectively known as Protostegidae. Fossil evidence show that at least five clades of marine turtles were roaming the seas at the end of the Cretaceous. In fact, chelonioids appeared during the first stages of the Early Cretaceous and quickly exploded to reach a high level of disparity at the lowermost part of the late Cretaceous. Therefore, the Mesozoic radiation of chelonioids must have happened during the "middle" Cretaceous (especially the Aptian-Albian interval). However this radiation is poorly understood as the phylogenetic relationships of marine turtles are not resolved yet. Bringing new data may help resolve these issues, and it is the exact reason why the genus Rhinochelys is being investigated. [less ▲]

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See detailInduced Drag Calculations with the Unsteady Vortex Lattice Method for Cambered Wings
Lambert, Thomas ULg; Dimitriadis, Grigorios ULg

in AIAA Journal (2017), 55(2), 668-672

The Unsteady Vortex Lattice Method (UVLM) is an approach widely used to estimate the aerodynamic loads in unsteady subsonic flows. It is based on modeling the camber surface of a lifting body by means of ... [more ▼]

The Unsteady Vortex Lattice Method (UVLM) is an approach widely used to estimate the aerodynamic loads in unsteady subsonic flows. It is based on modeling the camber surface of a lifting body by means of bound vortex rings. Even though this method has been known and used for several decades, there is little discussion of the modeling of the leading-edge suction in the literature. To address this concern, Simpson et al. [1] presented a comparison of two different ways to model this effect for the case of uncambered airfoils and wings in harmonic pitch or plunge motions. They concluded that the Joukowski method converges significantly faster than the Katz technique as the number of chorwise panels is increased. The present paper is an extension of the study by Simpson et al. to cambered lifting surfaces. It shows that the presence of camber can change radically the convergence performance of the two methods. For cambered wings, the Katz approach converges significantly faster than the Joukowski technique. [less ▲]

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See detailChez Froidmont au Nord : lectures polyphoniques d’une quête identitaire
Baiwir, Esther ULg; Adams, Juliette; Demonchaux, Chloé et al

in Tortue verte. Revue en ligne des littératures francophones (2017)

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See detailVoyage[s] à travers le thymus
Geenen, Vincent ULg

in Science et Culture (2017), (465), 14-15

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See detailA propos de l'émotion créatrice : vie, institution et histoire dans Les Deux Sources
Caeymaex, Florence ULg

in François, A.; Riquier, C. (Eds.) Bergson, la morale, les émotions (Annales bergsoniennes VIII) (2017)

Ce chapitre montre la centralité de l'émotion dans la théorie sociale de Bergson, au-delà de sa théorie psychologique. L'émotion n'est cependant pas seulement un phénomène sociologique, logé au fond des ... [more ▼]

Ce chapitre montre la centralité de l'émotion dans la théorie sociale de Bergson, au-delà de sa théorie psychologique. L'émotion n'est cependant pas seulement un phénomène sociologique, logé au fond des institutions sociales et morales ; en associant l'émotion, non au registre de la sensibilité passive, mais à celui d'une sensibilité active et créatrice, il suggère qu'elle est à la source des grandes transformations morales sans lesquelles la vie humaine ne connaîtrait pas de temporalité historique à proprement parler. [less ▲]

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See detailArchitecture and deconstruction: translation as a matter of speculative theory
Bodart, Céline ULg

Conference (2017, February)

If this conference proposes to explore the singular and minor expressions of architectural theory, it could at first seem strange to propose here a paper about the so-called derridean years of ... [more ▼]

If this conference proposes to explore the singular and minor expressions of architectural theory, it could at first seem strange to propose here a paper about the so-called derridean years of architecture. Rather, the vast body of literature produced on this specific episode argues that the encounter of architectural discourses with derridean deconstruction played a major role into the implementation of "the gilded age of theory" (Mallgrave, Goodman, 2011). But such an "age" needs now to be redefined in regard with its own cultural boundaries. What the decon has produced in the Anglo-American field of architectural theory is not what the deconstruction has produced on the French-speaking part of the debate (following the argument of Cusset, 2005). In France, the question of the effects of the Derrida's philosophy on the contemporary architectural discourses and practices still causes a kind of discomfort. "As if" no one could face with what this disciplinary cross-over of the mid-eighties both has produced and has not succeeded in producing; "as if", failure or not, this experimental encounter could had been no effects or consequences on the theories and practices which succeeded it. From one cultural context to another, we have two different versions of a same history. Different but not unrelated. The proposition is here to invest the productive gap between these overlapped versions, in order to question their respective modes of construction but also to re-open their ways of being transmitted. From an original translation of Derrida's Haunt (Wigley, 1993) in French, I would present a methodological approach (Despret, 2001) which attempts to create the conditions of a renewed relation between different versions of what the deconstruction could have produced in architecture. The exercise of the translation is seen as a way to question the co-existence of these different possible versions; a way to slow down the multiple gestures which hastily sweep the hesitations in the shared course of their history. [less ▲]

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See detailTwo-domain and three-domain limit cycles in a typical aeroelastic system with freeplay in pitch
Verstraelen, Edouard ULg; Dimitriadis, Grigorios ULg; Dal Ben Rossetto, Gustavo et al

in Journal of Fluids & Structures (2017), 69

Freeplay is a significant source of nonlinearity in aeroelastic systems and is strictly regulated by airworthiness authorities. It splits the phase plane of such systems into three piecewise linear ... [more ▼]

Freeplay is a significant source of nonlinearity in aeroelastic systems and is strictly regulated by airworthiness authorities. It splits the phase plane of such systems into three piecewise linear subdomains. Depending on the location of the freeplay, limit cycle oscillations can result that span either two or three of these subdomains. The purpose of this work is to demonstrate the existence of two-domain cycles both theoretically and experimentally. A simple aeroelastic system with pitch, plunge and control deflection degrees of freedom is investigated in the presence of freeplay in pitch. It is shown that two-domain and three-domain cycles can result from a grazing bifurcation and propagate in the decreasing airspeed direction. Close to the bifurcation, the two limit cycle branches interact with each other and aperiodic oscillations ensue. Equivalent linearization is used to derive the conditions of existence of each type of limit cycle and to predict their amplitudes and frequencies. Comparisons with measurements from wind tunnel experiments demonstrate that the theory describes these phenomena with accuracy. [less ▲]

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See detailMeasurement of pleural pressure swings with a fluid-filled esophageal catheter vs pulmonary artery occlusion pressure
VERSCHEURE, Sara ULg; MASSION, Paul ULg; GOTTFRIED, S et al

in Journal of Critical Care (2017), 37

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See detailThe EU financial transaction tax project
Van Cleynenbreugel, Pieter ULg; Devroe, Wouter

in De Witte, Bruno; Vos, Ellen; Ott, Andrea (Eds.) Between Flexibility and Disintegration The Trajectory of Differentiation in EU Law (2017)

This chapter analyses to what extent the EU's proposals to establish a financial transaction tax promote a fast track Europe in domains related to the core of the EU's internal market competences. It also ... [more ▼]

This chapter analyses to what extent the EU's proposals to establish a financial transaction tax promote a fast track Europe in domains related to the core of the EU's internal market competences. It also analyses the potential risks and negative consequences such an approach may trigger. [less ▲]

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See detailPrix fixe du livre : les propositions belges contredisent-elles le droit européen de la concurrence ?
Van Cleynenbreugel, Pieter ULg

in Tijdschrift voor Belgische Mededinging [=TBM] = Revue de la Concurrence Belge [=RCB] (2017), 4

Cet article analyse la compatibilité des propositions par les gouvernements communautaires belges des décrets relatifs aux prix fixes du livre, d'un point de vue du droit du marché intérieur ainsi que du ... [more ▼]

Cet article analyse la compatibilité des propositions par les gouvernements communautaires belges des décrets relatifs aux prix fixes du livre, d'un point de vue du droit du marché intérieur ainsi que du droit européen de la concurrence. [less ▲]

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See detailThe recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005
Bader, Whitney ULg; Bovy, Benoît ULg; Conway, Stephanie et al

in Atmospheric Chemistry and Physics (2017)

Changes of atmospheric methane total columns (CH4/ since 2005 have been evaluated using Fourier transform infrared (FTIR) solar observations carried out at 10 ground-based sites, affiliated to the Network ... [more ▼]

Changes of atmospheric methane total columns (CH4/ since 2005 have been evaluated using Fourier transform infrared (FTIR) solar observations carried out at 10 ground-based sites, affiliated to the Network for Detection of Atmospheric Composition Change (NDACC). From this, we find an increase of atmospheric methane total columns of 0.31±0.03 %/year (2-sigma level of uncertainty) for the 2005–2014 period. Comparisons with in situ methane measurements at both local and global scales show good 10 agreement. We used the GEOS-Chem chemical transport model tagged simulation, which accounts for the contribution of each emission source and one sink in the total methane, simulated over 2005–2012. After regridding according to NDACC vertical layering using a conservative 15 regridding scheme and smoothing by convolving with respective FTIR seasonal averaging kernels, the GEOS-Chem simulation shows an increase of atmospheric methane total columns of 0.35±0.03 %/year between 2005 and 2012, which is in agreement with NDACC measurements over the same time period (0.30±0.04 %/year, averaged over 10 stations). Analysis of the GEOS-Chem-tagged simulation allows us to quantify the contribution of each tracer to the global methane change since 2005. We find that natural sources such as wetlands and biomass burning contribute to the interannual variability of methane. However, anthropogenic emissions, such as coal mining, and gas and oil transport and exploration, which are mainly emitted in the Northern Hemisphere and act as secondary contributors to the global budget of methane, have played a major role in the increase of atmospheric methane observed since 2005. Based on the GEOS-Chem-tagged simulation, we discuss possible cause(s) for the increase of methane since 2005, which is still unexplained. [less ▲]

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See detailÉléments de droit public (syllabus partiel 2016-17)
Bouhon, Frédéric ULg; Miny, Xavier ULg

Learning material (2017)

Ce document constitue un syllabus partiel à destination des étudiants de bachelier à HEC-ULg qui suivent le cours d'Introduction au droit, partim droit public. Il a vocation à être complété à l'avenir par ... [more ▼]

Ce document constitue un syllabus partiel à destination des étudiants de bachelier à HEC-ULg qui suivent le cours d'Introduction au droit, partim droit public. Il a vocation à être complété à l'avenir par d'autres chapitres. Le syllabus est complémentaire au cours oral et n'est pas un support obligatoire. [less ▲]

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See detailSur l'évaluation de compétences en mathématiques
Bair, Jacques ULg

E-print/Working paper (2017)

Ce document comprend deux parties. Tout d’abord, un texte est consacré à des généralités sur la mesure de compétences, ainsi qu’à la présentation, illustrée par des exemples concrets, de différents types ... [more ▼]

Ce document comprend deux parties. Tout d’abord, un texte est consacré à des généralités sur la mesure de compétences, ainsi qu’à la présentation, illustrée par des exemples concrets, de différents types d’échelles (universelle, descriptive, globale) et de grilles d’évaluation. Enfin, ce travail se termine par la reproduction de diapositives (initialement réalisées à l’aide du logiciel Power Point) préparées pour accompagner une leçon sur l’évaluation ; l’exposé oral correspondant a été donné, dans le cadre de la FOPED (Formation Pédagogique), à plusieurs cohortes de stagiaires en mathématiques à l’Université du Luxembourg. [less ▲]

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See detailLes marqueurs biologiques de l’arthrose: De la découverte à l’analyse biologique de routine
Henrotin, Yves ULg

in Rhumatos (2017), 14(123), 180-183

Detailed reference viewed: 28 (2 ULg)