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

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

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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 detailEvidence for the alignment of quasar radio polarizations with large quasar group axes
Pelgrims, Vincent ULg; Hutsemekers, Damien ULg

in Astronomy and Astrophysics (2016)

Recently, evidence has been presented for the polarization vectors from quasars to preferentially align with the axes of the large quasar groups (LQG) to which they belong. This report was based on ... [more ▼]

Recently, evidence has been presented for the polarization vectors from quasars to preferentially align with the axes of the large quasar groups (LQG) to which they belong. This report was based on observations made at optical wavelengths for two large quasar groups at redshift ~1.3. The correlation suggests that the spin axes of quasars preferentially align with their surrounding large-scale structure that is assumed to be traced by the LQGs. Here, we consider a large sample of LQGs built from the Sloan Digital Sky Survey DR7 quasar catalogue in the redshift range 1.0 -􀀀 1.8. For quasars embedded in this sample, we collected radio polarization measurements with the goal to study possible correlations between quasar polarization vectors and the major axis of their host LQGs. Assuming the radio polarization vector is perpendicular to the quasar spin axis, we found that the quasar spin axis is preferentially parallel to the LQG major axis inside LQGs that have at least 20 members. This result independently supports the observations at optical wavelengths. We additionally found that when the richness of an LQG decreases, the quasar spin axis becomes preferentially perpendicular to the LQG major axis and that no correlation is detected for quasar groups with fewer than 10 members. [less ▲]

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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 detailSemiotyka wizualna między tekstualnością a praktyką. Wokół wypowiadania
Dondero, Maria Giulia ULg

in Thiel-Jańczuk, Katarzyna (Ed.) Taktyki wizualne. Michel de Certeau i obrazy (2016)

Niniejszy artykuł stawia sobie dwa cele. Pierwszym jest porównanie semiotyki tekstu Algirdasa Juliena Greimasa i Louisa Marina z semiotyką praktyk Jacques’a Fontanille’a. Prace Michela de Certeau na temat ... [more ▼]

Niniejszy artykuł stawia sobie dwa cele. Pierwszym jest porównanie semiotyki tekstu Algirdasa Juliena Greimasa i Louisa Marina z semiotyką praktyk Jacques’a Fontanille’a. Prace Michela de Certeau na temat praktyk odbioru i użycia pozwolą wyjaśnić relację między pojęciem wypowiadania wypowiedzianego (énonciation énoncée) w paradygmacie tekstu i wypowiadania w akcie (énonciation en acte) w paradygmacie praktyk. Drugim celem jest problematyzacja pojęcia wypowiadania w ramach języka wizualnego. W oparciu o teorie i analizy Louisa Marina (Opacité en peinture – Nieprzejrzystość w malarstwie) ukazana zostanie użyteczność pojęcia wypowiadania wypowiedzianego w studiach nad obrazami i podjęta zostanie próba przetestowania znaczenia, które wypowiadaniu nadaje de Certeau (Wynaleźć codzienność 1. Sztuki działania) w ramach odbioru i interpretacji obrazów. [less ▲]

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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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See detailDimensioning IRGA gas sampling systems: laboratory and field experiments
Aubinet, Marc ULg; Joly, Lilian; Loustau, Denis et al

in Atmospheric Measurement Techniques (2016), 9

Both laboratory and field experiments were carried out in order to define suitable configuration ranges for the gas sampling systems (GSSs) of infrared gas analyzers (IRGAs) used in eddy covariance ... [more ▼]

Both laboratory and field experiments were carried out in order to define suitable configuration ranges for the gas sampling systems (GSSs) of infrared gas analyzers (IRGAs) used in eddy covariance measurements. In the laboratory, an original dynamic calibration bench was developed in order to test the frequency attenuation and pressure drop generated by filters. In the field, three IRGAs of the same type equipped with different filters or different rain caps were installed and run and the real frequency response of the complete setup was tested. The main results are as follows. – Filters may have a strong impact on the pressure drop in the GSS and this impact increases with flow rate. – Conversely, no impact of the tested filters on cut-off frequency was found, GSSs with and without filters presenting similar cut-off frequencies. – The main limiting factor of cut-off frequency in the field was found to be the rain cap design. In addition, the impact of this design on pressure drop was also found to be noteworthy. [less ▲]

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See detailAbout Quaternary prevention in Public health ; comment on Dr Jong-Myon Bae paper
Jamoulle, Marc ULg

in Journal of Preventive Medicine and Public Health = Yebang Uihakhoe Chi (2016), 49(2), 139-140

The recent paper of Dr Jong-Myon Bae about Quaternary Prevention and Public Health in your journal has attracted my interest. The spread of this concept is beyond all expectation and I am quite happy it ... [more ▼]

The recent paper of Dr Jong-Myon Bae about Quaternary Prevention and Public Health in your journal has attracted my interest. The spread of this concept is beyond all expectation and I am quite happy it contributes to the analytic thinking of complexity of health care. The particular application of the quaternary prevention (P4) concept is absolutely brilliant. Nevertheless I would propose some slight modifications to the table 1 edited by the author which I have taken the liberty to reproduce here with the due authorization of Dr Bae and after several mail exchanges with him. [less ▲]

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