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See detailInfluence of plant roots on electrical resistivity measurements of cultivated soil columns
Maloteau, Sophie ULg; Blanchy, Guillaume ULg; Javaux, Mathieu et al

Poster (2016, April)

The goals of this experiment are to quantify the effect of plant roots on electrical resistivity of the soil subsurface and to map a plant roots system in space and time with ERT technique in a soil ... [more ▼]

The goals of this experiment are to quantify the effect of plant roots on electrical resistivity of the soil subsurface and to map a plant roots system in space and time with ERT technique in a soil column. For this research, it is assumed that roots system affect the electrical properties of the rhizosphere. Indeed the root activity (by transporting ions, releasing exudates, changing the soil structure,…) will modify the rhizosphere electrical conductivity (Lobet G. et al, 2013). This experiment is included in a bigger research project about the influence of roots system on geophysics measurements. Measurements are made on cylinders of 45 cm high and a diameter of 20 cm, filled with saturated loam on which seeds of Brachypodium distachyon (L.) Beauv. are sowed. Columns are equipped with electrodes, TDR probes and temperature sensors. Experiments are conducted at Gembloux Agro-Bio Tech, in a growing chamber with controlled conditions: temperature of the air is fixed to 20°C, photoperiod is equal to 14 hours, photosynthetically active radiation is equal to 200 µmol m-2s-1, and air relative humidity is fixed to 80 %. Columns are fully saturated the first day of the measurements duration then no more irrigation is done till the end of the experiment. [less ▲]

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See detailExposition "Magie et raison. Elisa von der Recke et l'affaire Cagliostro"
Leyh, Valérie ULg

in Culture, le Magazine Culturel de l'Université de Liège (2016)

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See detailUnderground Pumped Storage Hydropower using abandoned open pit mines: influence of groundwater seepage on the system efficiency
Pujades, Estanislao ULg; Bodeux, Sarah ULg; Orban, Philippe ULg et al

Poster (2016, April)

Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand ... [more ▼]

Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand energy periods, respectively. Nevertheless, PSH plants require a determined topography because two reservoirs located at different heights are needed. At sites where PSH plants cannot be constructed due to topography requirements (flat regions), Underground Pumped Storage Hydropower (UPSH) plants can be used to adjust the electricity production. These plants consist in two reservoirs, the upper one is located at the surface (or at shallow depth) while the lower one is underground (or deeper). Abandoned open pit mines can be used as lower reservoirs but these are rarely isolated. As a consequence, UPSH plants will interact with surrounding aquifers exchanging groundwater. Groundwater seepage will modify hydraulic head inside the underground reservoir affecting global efficiency of the UPSH plant. The influence on the plant efficiency caused by the interaction between UPSH plants and aquifers will depend on the aquifer parameters, underground reservoir properties and pumping and injection characteristics. The alteration of the efficiency produced by the groundwater exchanges, which has not been previously considered, is now studied numerically. A set of numerical simulations are performed to establish in terms of efficiency the effects of groundwater exchanges and the optimum conditions to locate an UPSH plant. [less ▲]

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See detailA first database for landslide studies in densely urbanized areas of the intertropical zone: Abidjan, Côte d’Ivoire
Gnagne, Lorng Frédéric ULg

Conference (2016, April)

A detail first database for landslide studies in densely urbanized areas have been produced in two prone-areas which are mainly affected. During rain season, landslides occurred in Abobo and Attecoube ... [more ▼]

A detail first database for landslide studies in densely urbanized areas have been produced in two prone-areas which are mainly affected. During rain season, landslides occurred in Abobo and Attecoube causing social and economic damages. Studies on landslides have been restricted or often simply lacking. Landslides were located by GPS and tentatively dated through inquiries during the survey. While 12 landslides were accurately dated that way from the main rain seasons of 2013 to 2015, newspapers analysis and municipal archive consultation allowed us to assign a part of the rest to the last decade. Field inquiries were also used to collect information about fatalities and the local conditions of landsliding. This first landslide inventory in Attecoube provides clues about the main potential controls on landsliding, natural and anthropogenic, and will help define adequately anthropogenic variables to be used in the susceptibility modelling. [less ▲]

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See detailExperimental Tests and Numerical Modelling on Slender Steel Columns at High Temperatures
Franssen, Jean-Marc ULg; Zhao, Bin; Gernay, Thomas ULg

in Journal of Structural Fire Engineering (2016), 7(1), 30-40

Purpose The purpose of this paper is to gain from experimental tests an insight into the failure mode of slender steel columns subjected to fire. The tests will also be used to validate a numerical model ... [more ▼]

Purpose The purpose of this paper is to gain from experimental tests an insight into the failure mode of slender steel columns subjected to fire. The tests will also be used to validate a numerical model. Design/methodology/approach A series of experimental fire tests were conducted on eight full-scale steel columns made of slender I-shaped Class 4 sections. Six columns were made of welded sections (some prismatic and some tapered members), and two columns were made of hot rolled sections. The nominal length of the columns was 2.7 meters with the whole length being heated. The load was applied at ambient temperature after which the temperature was increased under constant load. The load was applied concentrically on some tests and with an eccentricity in other tests. Heating was applied by electrical resistances enclosed in ceramic pads. Numerical simulations were performed with the software SAFIR® using shell elements. Findings The tests have allowed determining the appropriate method of application of the electrical heating system for obtaining a uniform temperature distribution in the members. Failure of the columns during the tests occurred by combination of local and global buckling. The numerical model reproduced correctly the failure modes as well as the critical temperatures. Originality/value The numerical model that has been validated has been used in subsequent parametric analyses performed to derive design equations to be used in practice. This series of test results can be used by the scientific community to validate their own numerical or analytical models for the fire resistance of slender steel columns. [less ▲]

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See detailEntretenir le souvenir de Charlemagne en Belgique. Regards croisés de médiévistes et de contemporanéistes
Close, Florence ULg; Lanneau, Catherine ULg

Book published by Société pour le progrès des études philologiques et historiques - extrait de la Revue Belge de Philologie et d'Histoire, t. 93 (2015/3-4) (2016)

À l’heure des grandes revendications identitaires d’inspiration romantique, le jeune état belge a fermement bataillé pour asseoir et renforcer un sentiment national propre. Il a cherché dans le passé le ... [more ▼]

À l’heure des grandes revendications identitaires d’inspiration romantique, le jeune état belge a fermement bataillé pour asseoir et renforcer un sentiment national propre. Il a cherché dans le passé le plus lointain les arguments susceptibles de saper certaines accusations tendant à présenter la Belgique comme un état sans nation, une construction artificielle. Charlemagne fut l’un des maillons de la chaîne. Ce volume constitue les actes d'une journée d'étude organisée à l'occasion du 1200 anniversaire de sa mort en vue de confronter les recherches de spécialistes des temps récents aux remarques et questionnements de carolingianistes avertis. [less ▲]

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See detailLa figure de Charlemagne dans la vulgarisation historique belge. Exemples choisis
Lanneau, Catherine ULg

in Revue Belge de Philologie et d'Histoire (2016), 93(2015/3-4),

Common ancestor of the Belgians, civilizing Christian emperor, father of Europe: these are some of the political (polemical) ways used to describe Charlemagne in the Belgium. This contribution seeks to ... [more ▼]

Common ancestor of the Belgians, civilizing Christian emperor, father of Europe: these are some of the political (polemical) ways used to describe Charlemagne in the Belgium. This contribution seeks to decipher and interpret these descriptions. What do we remember, or want to remember, from the origins and actions of the Carolingian emperor to show to the Belgians? Without pretending to be complete, certain marked tendencies and manifest evolutions are pointed out, found in the popular historical books for adults and children. Two key periods are defined: the first decades of the Belgian independence and the period after 1945. The final results are mixed: Charlemagne was certainly an icon, but in each of his avatars, failed to convince or win the majority support. His best enduring memory seems to be found today in the Euregion Meuse-Rhine, mostly because of the commercial and touristic value. [less ▲]

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See detailL'usage de la médiation scolaire entre contre-culture et nouveau mode d'exercice du pouvoir
Dethier, Baptiste ULg

in Ferréol, Gilles (Ed.) Médiations et Régulations (2016)

La référence à la notion de médiation dans différents pans de la société, notamment dans l’action publique, s’accompagne de nombreux discours et apports présumés. Toutefois, ceux-ci s’avèrent peu ... [more ▼]

La référence à la notion de médiation dans différents pans de la société, notamment dans l’action publique, s’accompagne de nombreux discours et apports présumés. Toutefois, ceux-ci s’avèrent peu opérationnalisables en situation, le travail de nouveaux agents s’exposant à une éventuelle instrumentalisation. Ces enjeux seront interrogés dans ce chapitre en trois parties prenant leur source dans une recherche doctorale consacrée à la médiation en milieu scolaire. D’abord, la notion de médiation sera contextualisée, dans un cadre sociétal large et dans la sphère éducative, en soulignant deux tendances contrastées. Ensuite, un aperçu du travail des médiateurs, principaux acteurs de la médiation scolaire en Belgique francophone, et de l’utilisation de leurs services sera proposé afin d’illustrer plus concrètement cette tension. Enfin, nous discuterons de ce contraste afin d’en pointer le lien fondamental avec la notion même de médiation. [less ▲]

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See detailMise au point d’une nouvelle méthode de diagnostic des allergènes du froment par Western blot 2D
BERTHOLET, Catherine ULg; GADISSEUR, Romy ULg; Quinting, Birgit

in Revue Française d'Allergologie (2016, April), 56(3), 284

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See detailClinically Relevant Optical Properties of Bifocal, Trifocal, and Extended Depth of Focus Intraocular Lenses
Gatinel, Damien; Loicq, Jerôme ULg

in Journal of Refractive Surgery (2016), 32(4), 273-280

PURPOSE: To experimentally compare the optical performance of three types of hydrophobic intraocular lenses (IOLs): extended depth of focus, bifocal, and trifocal. METHODS: The tested IOLs were: TECNIS ... [more ▼]

PURPOSE: To experimentally compare the optical performance of three types of hydrophobic intraocular lenses (IOLs): extended depth of focus, bifocal, and trifocal. METHODS: The tested IOLs were: TECNIS ZMB00 (bifocal; Abbott Medical Optics, Abbott Park, IL), TECNIS Symfony ZXR00 (extended depth of focus; Abbott Medical Optics), and FineVision GFree hydrophobic (trifocal; PhysIOL, Liège, Belgium). Their surface topography was analyzed by optical microscopy. Modulation transfer function (MTF) and spherical aberrations were determined on optical bench for variable pupil apertures and with two cornea models (0 μm and +0.28 μm). United States Air Force target imaging was analyzed for different focal points (near, intermediate, and far). Point spread function (PSF) and halos were quantified and compared. RESULTS: The three lenses presented step-like optic topography. For a pupil size of 3 mm or greater, clearly distinctive MTF peaks were observed for all lenses: two peaks for the extended depth of focus and bifocal lenses with +1.75 and +4.00 diopters (D) addition, respectively, and three peaks for the trifocal lens with +1.75 and +3.50 addition for intermediate and near vision, respectively. The extended depth of focus and bifocal lens had slightly higher MTF at best focus with the +0.28 μm cornea model than with the 0 μm model, whereas the trifocal lens was likely to be more independent of the corneal spherical aberrations.CONCLUSIONS: It appears that the three lenses rely on light diffraction for their optical performance, presenting halos with comparable intensities. For small pupil apertures (< 3 mm), the MTF peaks for the far and intermediate focal distances of the trifocal and extended depth of focus lenses overlap, but the trifocal lens presented an additional MTF peak for the near focal points. [less ▲]

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See detailÉgypte romaine. Les bébés du dépotoir
Ricciardetto, Antonio ULg

Article for general public (2016)

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See detailCrossoads (avril 2016) - chaque mercredi de 18h à20h - rediffusion: samedis de 22h à minuit
Sacré, Robert ULg

Diverse speeche and writing (2016)

Programme radio hebdomadaire consacré aux musiques africaines-américaines streaming : www.equinoxefm.be - podcasts : www.mixcloud.com/robertsacre9

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See detailReset Inquiry!
Thoreau, François ULg; d'Hoop, Ariane; Amat, Amandine et al

in Latour, Bruno (Ed.) Reset Modernity (2016)

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See detailDer Archäotraduktosaurus blickt zurück
Viehöver, Vera ULg

in ReLü: Rezensionszeitschrift zur Literaturübersetzung (2016)

Der Archäotraduktosaurus blickt zurück Vera Viehöver über Sourcier ou cibliste von Jean-René Ladmiral Jean-René Ladmiral, der sich selbst als „letzten Überlebenden eines längst vergangenen, vordigitalen ... [more ▼]

Der Archäotraduktosaurus blickt zurück Vera Viehöver über Sourcier ou cibliste von Jean-René Ladmiral Jean-René Ladmiral, der sich selbst als „letzten Überlebenden eines längst vergangenen, vordigitalen Erdzeitalters der Übersetzung“ sieht, gehört zu den Gründungsvätern der institutionalisierten Übersetzungswissenschaft in Frankreich. Der Band Sourcier ou cibliste (2014) versammelt Beiträge des Autors aus mehr als drei Jahrzehnten, die bislang zum Teil nur schwer auffindbar waren: die Bilanz eines leidenschaftlichen Kämpfers, der ein Übersetzen für die Leser fordert – scharf im Urteil gegen die Sakralisierung und Fetischisierung von literarischen Texten. [less ▲]

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See detailContribution à l'optimisation technico-économique des élevages laitiers en Wallonie : l'intervalle vêlage
Dalcq, Anne-Catherine ULg; Beckers, Yves ULg; Dogot, Thomas ULg et al

Conference given outside the academic context (2016)

Au cours des dernières décennies, l’intervalle vêlage des vaches laitières a eu tendance à s’allonger au niveau mondial, européen et belge. Les causes sont multiples : évolution du système de production ... [more ▼]

Au cours des dernières décennies, l’intervalle vêlage des vaches laitières a eu tendance à s’allonger au niveau mondial, européen et belge. Les causes sont multiples : évolution du système de production laitière, augmentation du niveau de production,… Les conséquences sont nombreuses également mais se traduisent-elles par un impact économique pour l’éleveur laitier ? La recherche présentée aujourd’hui se base sur près de 1800 bilans comptables de 400 exploitations laitières, fournis par le service technico-économique de l’Association Wallonne de l’Elevage, entre 2007 et 2014, pour déterminer l’impact économique de la durée de l’intervalle vêlage et définir l’optimum technico-économique de ce paramètre de management. Faut-il garder en tête « le veau par vache et par an » ou est-il intéressant économiquement d’allonger la période entre deux vêlages pour une même vache ? L’étude révèle qu’il y a bien une relation entre l’intervalle vêlage et les résultats économiques d’une exploitation. De plus, il n’y aurait pas un seul optimum d’intervalle vêlage mais plusieurs, dépendant du type d’exploitation et plus particulièrement du mode d’alimentation. L’optimum de l’intervalle vêlage a tendance à être plus court pour les exploitations à alimentation plutôt intensive et plus long pour les exploitations à alimentation plutôt extensive. Cependant il ne s’agit que de tendances observées, un travail plus approfondi doit encore être réalisé pour confirmer ces tendances et définir des objectifs plus précis à poursuivre pour maximiser la rentabilité de son exploitation. [less ▲]

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See detailCharacterization of monovarietal virgin olive oils from introduced cultivars in eastern Morocco
Mansouri, Farid ULg; Benmoumen, A.; Richard, Gaetan ULg et al

in Rivista Italiana Sostanze Grasse (2016), 93

The aim of this study was to characterize monovarietal virgin olive oils (VOOs) of new high-density planting system of three European cultivars (Arbequina, Arbosana and Koroneiki), recently introduced in ... [more ▼]

The aim of this study was to characterize monovarietal virgin olive oils (VOOs) of new high-density planting system of three European cultivars (Arbequina, Arbosana and Koroneiki), recently introduced in eastern Morocco. VOOs’ characterization has been carried out by analyzing several parameters, such as quality indexes, fatty acid contents, minor components, and olive oils’ oxidative stability index (OSI). In this study, we have also conducted a comparison between these monovarietal VOOs and olive oils of autochthones cultivar Picholine marocaine. Significant differences between the analyzed VOOs were highlighted. Koroneiki’s VOO had a high phenols content (493.66 mg/kg) and, consequently, the best oxidative stability (94.83 h); Arbrosana’s VOO was distinguished by its abundance of α-tocopherol (460.07 mg/kg) and by an intermediate OSI (64.83 h). In addition, results showed, firstly, that in all the analyzed oils decarboxymethyl ligstroside aglycone and decarboxymethyl oleuropein aglycone were the main phenolic compounds, and, secondly, that VOOs of Koroneiki and Arbosana seem to have similar profiles, with a high content of natural antioxidants and a high oleic/linoleic ratio, thus boasting a better shelf life. [less ▲]

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See detailLe législateur wallon sommé de revoir le découpage des circonscriptions électorales
Bouhon, Frédéric ULg

E-print/Working paper (2016)

Le caractère proportionnel de notre système électoral n’est pas un vain mot et ne peut être contourné. C’est ce que viennent de rappeler deux arrêts, le premier, prononcé par le Conseil d’État, datant du ... [more ▼]

Le caractère proportionnel de notre système électoral n’est pas un vain mot et ne peut être contourné. C’est ce que viennent de rappeler deux arrêts, le premier, prononcé par le Conseil d’État, datant du 20 novembre 2014 (n° 229.252) , le second, rendu par la Cour constitutionnelle le 26 novembre 2015 (n° 169/2015) . Le Parlement wallon doit revoir la carte électorale en vue des prochaines élections. [less ▲]

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See detailMusiciens et musiciennes à Mari (tell Hariri, Syrie) durant la fin de l’époque des shakkanakkus.
Colonna d'Istria, Laurent ULg

Scientific conference (2016, March 31)

Les sources écrites de la fin de l’époque des shakkanakkus (19e siècle av. J.-C.) sont en grande majorité des bordereaux administratifs découverts sur le site de Mari (Tell Hariri, Syrie). Ces quelques ... [more ▼]

Les sources écrites de la fin de l’époque des shakkanakkus (19e siècle av. J.-C.) sont en grande majorité des bordereaux administratifs découverts sur le site de Mari (Tell Hariri, Syrie). Ces quelques 2000 documents nous renseignent sur divers aspects de l’administration palatiale à cette époque, et citent à plusieurs reprises des musiciens et musiciennes. Appartenant au personnel du palais, ces musicien(ne)s recevaient des rations alimentaires et divers biens dont certains relatifs à leur fonction. Par ailleurs, étant responsables de transactions administratives, ces individus participaient activement à la gestion des biens du palais. Enfin, à l’instar de militaires ou de scribes, des musiciens font fonction d’intermédiaires dans la livraison de biens précieux offerts à différentes personnes appartenant à des élites, en particulier des seigneurs tribaux amorrites. [less ▲]

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See detailDiurnal cycle and multi-decadal trend of formaldehyde in the remote atmosphere near 46° N
Franco, Bruno ULg; Marais, Eloise A.; Bovy, Benoît ULg et al

in Atmospheric Chemistry and Physics (2016), 16

Only very few long-term records of formaldehyde (HCHO) exist that are suitable for trend analysis. Furthermore, many uncertainties remain as to its diurnal cycle, representing a large short-term ... [more ▼]

Only very few long-term records of formaldehyde (HCHO) exist that are suitable for trend analysis. Furthermore, many uncertainties remain as to its diurnal cycle, representing a large short-term variability superimposed on seasonal and inter-annual variations that should be accounted for when comparing ground-based observations to e.g., model results. In this study, we derive a multi-decadal time series (January 1988 – June 2015) of HCHO total columns from ground-based high-resolution Fourier transform infrared (FTIR) solar spectra recorded at the high-altitude station of Jungfraujoch (Swiss Alps, 46.5° N, 8.0° E, 3580 m a.s.l.), allowing for the characterization of the mid-latitudinal atmosphere for background conditions. First we investigate the HCHO diurnal variation, peaking around noontime and mainly driven by the intra-day insolation modulation and methane (CH4) oxidation. We also characterize quantitatively the diurnal cycles by adjusting a parametric model to the observations, which links the daytime to the HCHO columns according to the monthly intra-day regimes. It is then employed to scale all the individual FTIR measurements on a given daytime in order to remove the effect of the intra-day modulation for improving the trend determination and the comparison with HCHO columns simulated by the state-of-the-art chemical transport model GEOS-Chem v9-02. Such a parametric model will be useful to scale the Jungfraujoch HCHO columns on satellite overpass times in the framework of future calibration/validation efforts of space borne sensors. GEOS-Chem sensitivity tests suggest then that the seasonal and inter-annual HCHO column variations above Jungfraujoch are predominantly led by the atmospheric CH4 oxidation, with a maximum contribution of 25 % from the anthropogenic non-methane volatile organic compound precursors during wintertime. Finally, trend analysis of the so-scaled 27-year FTIR time series reveals a long-term evolution of the HCHO columns in the remote troposphere to be related with the atmospheric CH4 fluctuations and the short-term OH variability: +2.9 %/yr between 1988 and 1995, -3.7 %/yr over 1996-2002 and +0.8/% yr from 2003 onwards. [less ▲]

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