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See detailL’évaluation de l’efficacité des approches didactiques : l’art de conjuguer didactique et évaluation ? Symposium du réseau EVADIDA
Fagnant, Annick ULg; Schillings, Patricia ULg

in Actes du 27e colloque de l'Admée-Europe. L'évaluation à la lumière des contextes et des disciplines. (in press)

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See detailFormation et information en conservation-restauration
Verbeeck, Muriel ULg

in Retour d'expérience et regards rétrospectifs (in press)

Cette contribution porte sur l'évolution des formations en conservation-restauration ainsi que sur la nécessaire adaptation des techniques documentaires des professionnels. Elle recense les nombreuses ... [more ▼]

Cette contribution porte sur l'évolution des formations en conservation-restauration ainsi que sur la nécessaire adaptation des techniques documentaires des professionnels. Elle recense les nombreuses ressources disponibles. [less ▲]

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See detailIkhwāniyyāt Letters in the Mamluk Period: A Document (Muṭālaʿa) Issued by al-Muʾayyad Shaykh’s Chancery and a Contribution to Mamluk Diplomatics
Bauden, Frédéric ULg

in Levanoni, Amalia (Ed.) Egypt and Syria under Mamluk Rule: Political, Social and Cultural Aspects (in press)

Detailed reference viewed: 157 (13 ULg)
See detailLe débat art-industrie dans la deuxième moitié du XIXème siècle en Belgique. Une analyse documentaire
Prina, Daniela ULg

in Actes du Neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique - LVIe Congrès de la Fédération des Cercles d'Archéologie et d'Histoire de Belgique - Liège, 23-26 août 2012 (in press)

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See detailLouise de Savoie et la "Cène" de Léonard de Vinci
Fagnart, Laure ULg

in Brioist, Pascal (Ed.) Léonard de Vinci. Romorantin. Le projet oublié. Actes du colloque international tenu à Romorantin-Lanthenay les 3, 4, 5 et 6 juin 2010 (in press)

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See detail« Semen est sanguis christianorum » (Apol. 50, 13). Tertullien et l'hagiographie africaine
Fialon, Sabine ULg

in Lagouanère, Jérôme; Fialon, Sabine (Eds.) Tertullianus Afer. Tertullien et la littérature chrétienne d'Afrique, IIe-VIe siècle (in press)

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See detailSymboles et abréviation chrétiens dans les papyrus littéraires grecs à contenu profane (IVe-VIIe siècles)
Carlig, Nathan ULg

in Derda, Tomasz; Urbanik, Jakub (Eds.) Acts of the 27th International Congress of Papyrology (Warsaw, 29th July - 3rd August 2013) (in press)

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See detailInventer. Le jeune Descartes et les voies de l’inventio en 1619-1620
Dubouclez, Olivier ULg

in Savini, Massimiliano (Ed.) Les écrits de jeunesse de Descartes (in press)

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See detailDependency-based analyses for function words. Introducing the polygraphic approach
Kahane, Sylvain; Mazziotta, Nicolas ULg

in Proceedings of Depling 2015. International conference on dependency linguistics (in press)

This paper scrutinizes various dependency-based representations of the syntax of function words, such as prepositions. The focus is on the underlying formal object used to encode the linguistic analyses ... [more ▼]

This paper scrutinizes various dependency-based representations of the syntax of function words, such as prepositions. The focus is on the underlying formal object used to encode the linguistic analyses and its relation to the corresponding linguistic theory. Two types of representation are proposed for the encoding of syntactic properties and applied for function words. Although the mathematical object introduced here encodes a dependency-based analysis, it does not consist in a tree. It is rather more general than a graph (it allows edges to be vertices of other edges) and is called a polygraph. [less ▲]

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See detailOn the Vedic Yajamâna-
Swennen, Philippe ULg

in Acts of the 6th Vedic Workshop (in press)

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See detailAntiquité tardive et christianisme africains dans l'Africa romana : un bilan historiographique
Fialon, Sabine ULg

in Ruggeri, Paola (Ed.) L’Africa romana XX. Momenti di continuita e rottura : bilancio di 30 anni di convegni de l’Africa romana (in press)

Detailed reference viewed: 29 (1 ULg)
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See detailLes mentions d'auteurs antiques dans les chansons de geste françaises
Henrard, Nadine ULg

in Haugeard, Philippe; Ribémont, Bernard (Eds.) Chanson de geste et savoirs savants (in press)

Les origines savantes ou populaires des épopées françaises médiévales ont longtemps fait débat. Il s'avère que ces textes contiennent un très grand nombre de références à des personnages issus de ... [more ▼]

Les origines savantes ou populaires des épopées françaises médiévales ont longtemps fait débat. Il s'avère que ces textes contiennent un très grand nombre de références à des personnages issus de l’Antiquité qui témoignent d’une formation scolaire chez les auteurs des chansons. Sur la base d'un examen de l'ensemble du corpus, cette étude s'intéresse plus particulièrement aux mentions explicites faites à des auteurs antiques, qu'ils soient grecs (Homère, Aristote, Platon) ou latins (Virgile, Ovide, César, Caton, Sénèque). En tenant de déterminer les traditions qui ont pu nourrir l'inspiration des auteurs des chansons de geste, elle s'emploie à définir les situations dans lesquelles les références en question apparaissent, et s’interroge sur les finalités que poursuivent les poètes à travers l’évocation des auteurs antiques, dont certains, comme César ou Virgile, sont davantage restés dans les mémoires pour des éléments réels ou imaginaires de leur vie plutôt que pour leur œuvre. [less ▲]

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See detailJuvenal in Antinoë. Paleographic and Contextual Observations on P.Ant. s.n.
Macedo, Gabriel ULg

in Urbanik, Jakub (Ed.) Proceedings of the 27th International Congress of Papyrology. Warsaw, 29 July - 3 August 2013 (in press)

Paleographic and contextual study of the only Juvenal manuscript found in Egypt.

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See detailStellar acoustic radii and ages from seismic inversion techniques
Buldgen, Gaël ULg; Dupret, Marc-Antoine ULg; Reese, Daniel Roy et al

in The Space Photometry Revolution CoRoT Symposium 3, Kepler KASC-7 joint meeting (in press)

Determining stellar characteristics such as the radius, mass or age is crucial and asteroseismology is currently the most promising tool to provide these results accurately. We extend the SOLA inversion ... [more ▼]

Determining stellar characteristics such as the radius, mass or age is crucial and asteroseismology is currently the most promising tool to provide these results accurately. We extend the SOLA inversion technique to new global characteristics in addition to the mean density (see Reese et al. 2012) and apply our methodology to the acoustic radius and an age indicator based on the sound speed derivative. The results from SOLA inversions are compared with estimates based on the small and large frequency separations for several test cases.We show that SOLA inversions yield more accurate results than other techniques which are more sensitive to surface effects. [less ▲]

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See detailLe Portrait d'homme en armure de Giovanni Gerolamo Savoldo, un portrait présumé de Gaston de Foix
Fagnart, Laure ULg

in Barreto, Joana (Ed.) Voir Gaston de Foix. La construction paradoxale d'un mythe national. Actes de la journée d'études tenue au Palazzo Venezia de Rome le 22 juin 2013 (in press)

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See detailÉclairer les enjeux de la reconstruction industrielle du bassin liégeois : l'apport des archives des Etablissements insalubres et dangereux (1919-1925)
Peters, Arnaud ULg; Defechereux, Olivier ULg; Destatte, Julien ULg

in Parmentier, Isabelle (Ed.) Actes des Deuxièmes Rencontres d'Histoire de l'Environnement en Belgique (Belgique, Luxembourg, Congo, Rwanda, Burundi) (in press)

Detailed reference viewed: 37 (17 ULg)
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See detailDébats européens sur les formes de la vie marine au Siècle des Lumières
Vandersmissen, Jan ULg

in Jullien, Vincent; Nicolaidis, Efthymios; Skordoulis, Kostas (Eds.) Europe et sciences modernes, histoire d’un engendrement mutuel (in press)

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See detailEst-il possible de cibler les acquis et les faiblesses des élèves face à la résolution de problèmes arithmétiques dans le cadre d’une évaluation externe non certificative ?
Demonty, Isabelle ULg; Fagnant, Annick ULg

in Actes du 27e colloque de l'Admée-Europe. L'évaluation à la lumière des contextes et des disciplines. (in press)

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See detailLa question des « objets » d’évaluation dans les différentes disciplines : Discussion du symposium
Fagnant, Annick ULg

in Actes du 27e colloque de l'Admée-Europe. L'évaluation à la lumière des contextes et des disciplines. (in press)

Detailed reference viewed: 17 (3 ULg)
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See detail"Gens" isiaque et intailles. L’envers de la médaille
Veymiers, Richard ULg

in Iossif, Panagiotis; de Callataÿ, François; Veymiers, Richard (Eds.) Greek Coins and their Images: "Noble" Issuers, "Humble" Users? (in press)

Detailed reference viewed: 38 (1 ULg)
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See detailLe débat sur la véritable nature du corail
Vandersmissen, Jan ULg

in Actes du IXe Congrès de l’Association des Cercles francophones d’Histoire et d’Archéologie de Belgique (in press)

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See detailLe développement d'une multinationale métallurgique liégeoise : la Compagnie Générale des Conduites d'eau (1865-1939)
Destatte, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (in press)

The "Compagnie Générale des Conduites d'eau" was an financial and industrial company based in Liège. This article explains briefly how it worked during the periode between its creation in 1865 and 1939.

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See detailLa légation des Pays-Bas en cour de Rome au temps de l’agent Laurent du Blioul (1573-1598): Une légation au cœur des réseaux de la monarchie de Philippe II
Regibeau, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (in press)

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See detailÀ propos de l’écologie du discours heuristique
Job, Pierre ULg; Gilot, Marguerite ULg

in Actes du 4ième congrès international sur la théorie anthropologique du didactique (TAD) : Évolutions contemporaines du rapport aux mathématiques et aux autres savoirs à l'école et dans la société (in press)

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See detailAu seuil de l’Histoire de ma vie : la Préface en trois versions des mémoires de Casanova (1791, 1794, 1797)
Tilkin, Françoise ULg

in Annales Littéraires de Franche-Comté (PUFC). (in press)

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See detailRelire Durkheim à partir de Zola : Ce que le roman naturaliste fait à la sociologie du suicide de Durkheim
Ledent, David ULg

in Le suicide : question individuelle ou question sociétale ? (in press)

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See detailLA RENONCIATION, L’ABDICATION ET LA RUPTURE DU CONTRAT DE TRAVAIL
Kéfer, Fabienne ULg

in LA RUPTURE DU CONTRAT DE TRAVAIL : ENTRE HARMONISATION ET DISCRIMINATION (in press)

L’étude, limitée au contexte de la dissolution du contrat de travail, aborde, dans une première partie, la possibilité pour les parties au contrat de travail de renoncer au bénéfice d’une disposition ... [more ▼]

L’étude, limitée au contexte de la dissolution du contrat de travail, aborde, dans une première partie, la possibilité pour les parties au contrat de travail de renoncer au bénéfice d’une disposition, possibilité liée au caractère impératif ou d’ordre de la disposition en cause. Est particulièrement étudié le lien entre le rapport de subordination et la faculté d’abdiquer un droit. Le document effectue ensuite une incursion dans la question de la preuve de la renonciation. La troisième partie passe en revue un large éventail de droits auxquels les parties pourraient être tentées de renoncer : clauses d’écolage, clauses de stabilité d’emploi, renonciation au droit d’invoquer la rupture du contrat de travail en cas d’acte équipollent à rupture ou de préavis nul, renonciation à la durée du préavis ou à l’indemnité en tenant lieu, renonciation au reclassement professionnel, aux droits découlant d’une convention collective, renonciation par un délégué du personnel, renonciation par la voie d’une convention collective, etc. Si la matière reste incertaine à bien des égards, elle est aussi en évolution, tant par l’effet de la jurisprudence que par l’action de la loi, et notamment celle du 26 décembre 2013 dite « statut unique », qui a modifié de manière sensible le champ de la licéité des renonciations au délai ou à l’indemnité compensatoire de préavis. [less ▲]

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See detailPaper documents from Iṣṭabl ʿAntar: Assessment of the findings and data analysis
Bauden, Frédéric ULg

in Denoix, Sylvie; Gayraud, Roland-Pierre (Eds.) Fusṭāṭ - Iṣṭabl ʿAntar IFAO's Excavations. First Symposium (in press)

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See detailFaire de la musique : rythmes et rapports chez Mallarmé
Durand, Pascal ULg

in Bazantay, Pierre; Bonnet, Antoine; Frangne, Pierre-Henry (Eds.) Mallarmé et la Musique, la Musique et Mallarmé (in press)

Inséparable du processus d'autonomisation du discours poétique et de la radicalisation que ce processus connaît chez lui, sur fond de propagande wagnérienne et de propagation du vers libre, le modèle ... [more ▼]

Inséparable du processus d'autonomisation du discours poétique et de la radicalisation que ce processus connaît chez lui, sur fond de propagande wagnérienne et de propagation du vers libre, le modèle musical prend, dans l'esthétique de Mallarmé, l'aspect d'un système de rapports généralisés à tous les paramètres de l'écrit. L'inhérence réciproque que le poète établit entre la "Musique" et les "Lettres", représentation imaginaire dont Un Coup de dés constitue la contrepartie réalisée, répond d'un côté à un matérialisme de la forme et de l'autre à un idéalisme fictif, voulant que les structures verbales et prosodiques s'offrent en miroir du système de rapports avec quoi se confond, en sa finitude sans extériorité, l’univers même. [less ▲]

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See detailLa bataille de (la) Ptérie. La Lydie face à la Perse (ca. 547 av. J.-C.)
Leloux, Kevin ULg

in Actes du 9e Congrès de l'Association des Cercles Francophones d'Histoire et d'Archéologie de Belgique (23-26 août 2012) (in press)

Chacun sait que chez les anciens Grecs, Crésus passait pour un roi richissime à la tête d’un des plus puissants royaumes de son temps. En apportaient la preuve ses nombreuses offrandes consacrées au ... [more ▼]

Chacun sait que chez les anciens Grecs, Crésus passait pour un roi richissime à la tête d’un des plus puissants royaumes de son temps. En apportaient la preuve ses nombreuses offrandes consacrées au sanctuaire de Delphes, visibles de tous. L’épisode de sa mort sur un bûcher, un des moments les plus dramatiques de son existence, fut évoqué par nombre d’auteurs anciens et elle a fait l’objet de représentations figurées tout au long de l’Antiquité. Enfin, il ne faut pas oublier que pour un Grec du VIe siècle, l’homme passait pour constituer comme un rempart infranchissable protégeant les cités grecques de la côte d’Asie Mineure contre la puissance montante des Perses de Cyrus II le Grand. Ainsi la défaite inattendue du roi lydien face aux troupes perses en Ptérie constitue-t-elle un épisode décisif de l’époque archaïque grecque dans la mesure où elle signe la fin prochaine du royaume lydien et de son formidable maître. Les cités grecques d’Asie Mineure allaient vite devoir face à leur destin : une soumission aux Perses puis leur révolte entraînant les terribles guerres médiques. Dans notre exposé, on mettra l’accent sur les causes de cette bataille décisive perdue par Crésus à Ptérie, sur son déroulement et ses enjeux à la lumière des sources à notre disposition. On sera amené à analyser le tracé de la Route royale empruntée par le dernier descendant de Gygès pour se rendre en Cappadoce ; on aura ainsi l’occasion de voir que son existence est bien antérieure à l’arrivée des Perses en Anatolie occidentale. Enfin notre exposé présentera la localisation exacte de la ville de Ptérie, une question débattue depuis longtemps mais que des fouilles archéologiques récentes ont permis d’éclairer. [less ▲]

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See detailRamses. An Annotated Corpus of Late Egyptian
Winand, Jean ULg; Polis, Stéphane ULg; Rosmorduc, Serge

in Kousoulis, P. (Ed.) Proceedings of the Xth IAE Congress (Rhodos, 2008) (in press)

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See detailInventaire et typologie des listes grecques et latines de produits pharmaceutiques conservées sur papyrus, ostracon et tablette (IIIe s. av. J.-Chr.-VIIe s. apr. J.-Chr.)
Ricciardetto, Antonio ULg

in Actes du XXVIIe Congrès international de Papyrologie (Varsovie, 29.07-3.08.2013) (in press)

Dans la documentation papyrologique relative aux pratiques médicales de l’Égypte gréco-romaine et byzantine, le genre des listes de produits pharmaceutiques n’a encore jamais fait l’objet, ni d’un ... [more ▼]

Dans la documentation papyrologique relative aux pratiques médicales de l’Égypte gréco-romaine et byzantine, le genre des listes de produits pharmaceutiques n’a encore jamais fait l’objet, ni d’un inventaire, ni d’une étude exhaustifs. Dans le cadre de nos recherches doctorales sur la typologie des papyrus documentaires grecs et latins à caractère médical, c’est cette lacune que l’on se propose de combler, d’une part en cataloguant, au moyen de la fiche Mertens-Pack³ du CEDOPAL, la trentaine de listes de produits pharmaceutiques provenant d’Égypte, écrites en grec sur papyrus et ostracon (IIIe s. av. J.-Chr.-VIIe s. apr. J.-Chr.), auxquelles on ajoutera deux listes latines sur tablettes de bois, provenant du camp romain de Vindolanda (c. 100p), et, d’autre part, en analysant les aspects formels, paléographiques, textuels et contextuels de ces documents médicaux qui peuvent correspondre, soit à un inventaire de droguiste, soit à une commande, soit à une ou plusieurs recettes dont l’état fragmentaire du support a fait disparaître les proportions. On comparera les données obtenues avec d’autres pièces papyrologiques, spécialement les nombreuses prescriptions médicales, ainsi que les comptes, les reçus de paiement ou encore les lettres privées relatives à des demandes de médicaments ou à la livraison de substances pharmaceutiques. [less ▲]

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See detailSparse plus low-rank autoregressive identification in neuroimaging time series
Liegeois, Raphaël ULg; Mishra, Bamdev ULg; Zorzi, Mattia et al

in Proceedings of CDC 2015 (2016)

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See detailEfficiency of shaft sealing for CO2 sequestration in coal mines
Bertrand, François ULg; Charlier, Robert ULg; Collin, Frédéric ULg et al

in International Workshop on Geomechanics and Energy: The Ground as Energy Source and Storage (2015, October 13)

This work examined the efficiency of a shaft sealing system for the CO2 sequestration in abandoned coal mines. The particular case of the coal mine of Anderlues was considered. The performed simulation ... [more ▼]

This work examined the efficiency of a shaft sealing system for the CO2 sequestration in abandoned coal mines. The particular case of the coal mine of Anderlues was considered. The performed simulation took into account the anisotropic behaviour of shale and the presence of coalbeds. [less ▲]

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See detailTime Ordering Shuffling for Improving Background Subtraction
Laugraud, Benjamin ULg; Latour, Philippe ULg; Van Droogenbroeck, Marc ULg

in Advanced Concepts for Intelligent Vision Systems (ACIVS) (2015, October)

By construction, a video is a series of ordered frames, whose order is defined at the time of the acquisition process. Background subtraction methods then take this input video and produce a series of ... [more ▼]

By construction, a video is a series of ordered frames, whose order is defined at the time of the acquisition process. Background subtraction methods then take this input video and produce a series of segmentation maps expressed in terms of foreground objects and scene background. To our knowledge, this natural ordering of frames has never been questioned or challenged. In this paper, we propose to challenge, in a prospective view, the natural ordering of video frames in the context of background subtraction, and examine alternative time orderings. The idea consists in changing the order before background subtraction is applied, by means of shuffling strategies, and re-ordering the segmentation maps afterwards. For this purpose, we propose several shuffling strategies and show that, for some background subtraction methods, results are preserved or even improved. The practical advantage of time shuffling is that it can been applied to any existing background subtraction seamlessly. [less ▲]

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See detailA Generic Feature Selection Method for Background Subtraction Using Global Foreground Models
Braham, Marc ULg; Van Droogenbroeck, Marc ULg

in Advanced Concepts for Intelligent Vision Systems (2015, October)

Over the last few years, a wide variety of background subtraction algorithms have been proposed for the detection of moving objects in videos acquired with a static camera. While much effort have been ... [more ▼]

Over the last few years, a wide variety of background subtraction algorithms have been proposed for the detection of moving objects in videos acquired with a static camera. While much effort have been devoted to the development of robust background models, the automatic spatial selection of useful features for representing the background has been neglected. In this paper, we propose a generic and tractable feature selection method. Interesting contributions of this work are the proposal of a selection process coherent with the segmentation process and the exploitation of global foreground models in the selection strategy. Experiments conducted on the ViBe algorithm show that our feature selection technique improves the segmentation results. [less ▲]

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See detailCombining Features for Cover Song Identification
Osmalsky, Julien ULg; Embrechts, Jean-Jacques ULg; Foster, Peter et al

in 16th International Society for Music Information Retrieval Conference (2015, October)

In this paper, we evaluate a set of methods for combining features for cover song identification. We first create multiple classifiers based on global tempo, duration, loudness, beats and chroma average ... [more ▼]

In this paper, we evaluate a set of methods for combining features for cover song identification. We first create multiple classifiers based on global tempo, duration, loudness, beats and chroma average features, training a random forest for each feature. Subsequently, we evaluate standard combination rules for merging these single classifiers into a composite classifier based on global features. We further obtain two higher level classifiers based on chroma features: one based on comparing histograms of quantized chroma features, and a second one based on computing cross-correlations between sequences of chroma features, to account for temporal information. For combining the latter chroma-based classifiers with the composite classifier based on global features, we use standard rank aggregation methods adapted from the information retrieval literature. We evaluate performance with the Second Hand Song dataset, where we quantify performance using multiple statistics. We observe that each combination rule outperforms single methods in terms of the total number of identified queries. Experiments with rank aggregation methods show an increase of up to 23.5 % of the number of identified queries, compared to single classifiers. [less ▲]

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See detailAssessing electrical resistivity tomography for hydrofacies detection using a sensitivity dependent probabilistic methodology
Hermans, Thomas ULg; Irving, James

in EarthDoc - Near Surface Geosciences 2015 (2015, September 08)

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may ... [more ▼]

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may provide important information on the spatial distribution of hydrogeological parameters. However, ERT inversion introduces some bias in the resulting resistivity distribution due to regularization and resolution issues. In this study, we refine ERT inversions by incorporating prior information in order to improve the identification of facies through a probabilistic relationship derived from collocated measurements. We then analyze with synthetic cases the effect of spatially varying sensitivity on the probabilistic relationship. As expected, when sensitivity decreases, the distributions of resistivity for the different facies tend to be superimposed. A mean distribution thus overestimates the ability of surface ERT to discriminate hydrofacies in depth. [less ▲]

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See detailFragility Analysis of a Steel Building in Fire
Gernay, Thomas ULg; Elhami Khorasani, Negar; Garlock, Maria

in Usmani, Asif; Lu, Yong; Das, Purnendu (Eds.) Proceedings of the First International Conference on Structural Safety under Fire & Blast - CONFAB 2015 (2015, September 03)

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings ... [more ▼]

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings to fire following earthquake, a potentially highly destructive cascading multi-hazard event. In a previous part of the work, a model has been developed to predict the probability of ignition in a building due to an earthquake. Given an ignition in a building, the probability of the structure exceeding certain limit states must be evaluated in order to quantify the expected damage loss. Adopting an approach similar to that used in seismic engineering, fragility functions can be developed for structures subjected to fire. The methodology is described here for a prototype nine-story steel frame building. In developing the fragility functions, uncertainties in the fire model, the heat transfer model and the thermo-mechanical response are considered. In addition several fire scenarios at different locations in the building are studied. The demand on and capacity of the system are assessed probabilistically in terms of critical temperature. The developed fire fragility functions yield the probability of exceedance of predefined damage states as a function of the fire load in the building. Future works will aim to implement fire fragility functions into a GIS based risk assessment software platform for assessment of the expected risk and cost associated with fire following earthquake for a community of buildings. [less ▲]

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See detailSimple Median-Based Method for Stationary Background Generation Using Background Subtraction Algorithms
Laugraud, Benjamin ULg; Pierard, Sébastien ULg; Braham, Marc ULg et al

in New Trends in Image Analysis and Processing - ICIAP 2015 Workshops (2015, September)

The estimation of the background image from a video sequence is necessary in some applications. Computing the median for each pixel over time is effective, but it fails when the background is visible for ... [more ▼]

The estimation of the background image from a video sequence is necessary in some applications. Computing the median for each pixel over time is effective, but it fails when the background is visible for less than half of the time. In this paper, we propose a new method leveraging the segmentation performed by a background subtraction algorithm, which reduces the set of color candidates, for each pixel, before the median is applied. Our method is simple and fully generic as any background subtraction algorithm can be used. While recent background subtraction algorithms are excellent in detecting moving objects, our experiments show that the frame difference algorithm is a technique that compare advantageously to more advanced ones. Finally, we present the background images obtained on the SBI dataset, which appear to be almost perfect. The source code of our method can be downloaded at http://www.ulg.ac.be/telecom/research/sbg . [less ▲]

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See detailChanging public viewpoints on wind energy development in Belgium
Vanderheyden, Vincent ULg; Schmitz, Serge ULg

in Abstracts. Energy Landscapes: Perception, Planning, Participation and Power. European Conference of the Landscape Research Group, Dresden, 16‐18 September 2015 (2015, September)

The amount of wind turbines has increased exponentially in Belgium in the last eight years (175 in 2007, 771 in 2015). During this period, especially in the last two years, critics of this energy have ... [more ▼]

The amount of wind turbines has increased exponentially in Belgium in the last eight years (175 in 2007, 771 in 2015). During this period, especially in the last two years, critics of this energy have become more organised, virulent, and active in delaying or stopping many projects. The landscape impact of wind energy is central to their arguments. We wonder if people’s attitudes towards wind turbines and landscape changed in the last years in Belgium and how they changed. This paper compares public perception of wind energy in two researches about landscape perception. The two studies used slightly different methodologies but with similarities in the designs, allowing some comparisons. The first research (2007‐2009) aimed to study the perceived landscape impact and the social acceptance of wind turbines in Belgium. 1542 Belgians were surveyed about their landscape preferences using a photo‐questionnaire, including some pictures with wind turbines. 75 stakeholders of wind energy projects were also interviewed. The second research (2012‐2014) aimed to examine deeper the landscape preferences among 54 residents in three areas in Wallonia where wind turbines are present, using the previous photographs. During the conduct of the first research, changing attitudes were already observed. People had become more familiar with wind turbines and were less reluctant. The symbolic positive aspect of wind energy was highlighted seven years ago. This view continues. However, people seem more categorical in their viewpoint. All respondents have now been confronted to wind energy, which was not the case seven years ago. Some persons are not against wind farms but their increase in number start to overwhelm them. Others point they get used to the turbines, as long as they are not too many and too close. The huge increase in wind farms in the last seven years has changed the acceptance of wind energy. Some doubts about the real efficiency of this energy also shaped the attitudes. [less ▲]

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See detailReview of existing solutions and presentation of a simplified method for the crashworthiness of lock gates
Buldgen, Loïc ULg; Ehlers, Sören; Le Sourne, Hervé et al

in Proceedings of the Smart Rivers 2015 Conference (2015, September)

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See detailGalland épigraphiste et philologue classique
Famerie, Etienne ULg

in Bauden, Frédéric; Waller, Richard (Eds.) Actes du Colloque "Antoine Galland (1646-1715) : orientaliste, antiquaire, numismate, humaniste" (2015, September)

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See detailRELY – short term scientific missions
Schmitz, Serge ULg

in Abstracts. Energy Landscapes: Perception, Planning, Participation and Power. European Conference of the Landscape Research Group, Dresden, 16‐18 September 2015 (2015, September)

The COST Action TU1401 ‘Renewable Energy and Landscape Quality’ ('RELY') encourages Short Term Scientific Missions (STSMs). This Action investigates “the inter‐relationships between renewable energy ... [more ▼]

The COST Action TU1401 ‘Renewable Energy and Landscape Quality’ ('RELY') encourages Short Term Scientific Missions (STSMs). This Action investigates “the inter‐relationships between renewable energy production and landscape quality, and the role of public participation for the acceptance of renewable energy systems”. STSMs are exchange visits from five working days until three months that are aiming to strengthen the existing networks by allowing individual scientists to go to an institution or laboratory in other COST country to foster collaboration and contribute to the scientific objectives of the COST Action. Each year of the COST Action TU1401, there are up to six STSMs to be awarded. The financial support is a contribution to the costs of a STSM. A grant (maximum 2500€ depending on the duration of the stay) covers travel and subsistence. We invite researchers, especially early stage researchers, to participate in a STSM. The selection of STSM applicants is based on the scientific scope of the STSM application that must be in line with the Cost Action TU1401 objectives. This short communication aims to inform of the next calls and presents the result of the 2015 call. [less ▲]

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See detailNonlinear Background Filter to Improve Pedestrian Detection
Wang, Yi; Pierard, Sébastien ULg; Su, Song-Zhi et al

in International Conference on Image Analysis and Processing (ICIAP) (2015, September)

In this paper, we propose a simple nonlinear filter which improves the detection of pedestrians walking in a video. We do so by first cumulating temporal gradient of moving objects into a motion history ... [more ▼]

In this paper, we propose a simple nonlinear filter which improves the detection of pedestrians walking in a video. We do so by first cumulating temporal gradient of moving objects into a motion history image (MHI). Then we apply to each frame of the video a motion-guided nonlinear filter whose goal is to smudge out background details while leaving untouched foreground moving objects. The resulting blurry-background image is then fed to a pedestrian detector. Experiments reveal that for a given miss rate, our motion-guided nonlinear filter can decrease the number of false positives per image (FPPI) by a factor of up to 26. Our method is simple, computationally light, and can be applied on a variety of videos to improve the performances of almost any kind of pedestrian detectors. [less ▲]

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See detailA perfect estimation of a background image does not lead to a perfect background subtraction: analysis of the upper bound on the performance
Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in International Conference on Image Analysis and Processing (ICIAP) (2015, September)

The quest for the “best” background subtraction technique is ongoing. Despite that a considerable effort has been undertaken to develop flexible and efficient methods, some elementary questions are still ... [more ▼]

The quest for the “best” background subtraction technique is ongoing. Despite that a considerable effort has been undertaken to develop flexible and efficient methods, some elementary questions are still unanswered. One of them is the existence of an intrinsic upper bound to the performance. In fact, data are affected by noise, and therefore it is illusory to believe that it is possible to achieve a perfect segmentation. This paper aims at exploring some intrinsic limitations of the principle of background subtraction. The purpose consists in studying the impact of several limiting factors separately. One of our conclusions is that even if an algorithm would be able to calculate a perfect background image, it is not sufficient to achieve a perfect segmentation with background subtraction, due to other intrinsic limitations. [less ▲]

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See detailEstimation of Airline Itinerary Choice Models Using Disaggregate Ticket Data
Lurkin, Virginie ULg; Garrow, Laurie A.; Higgins, Matthew J. et al

in 55th AGIFORS Annual Proceedings 2015 (2015, August 29)

Airline itinerary choice models support many multi-million dollar decisions, i.e., they are used to evaluate potential route schedules. Classic models suffer from major limitations, most notably they use ... [more ▼]

Airline itinerary choice models support many multi-million dollar decisions, i.e., they are used to evaluate potential route schedules. Classic models suffer from major limitations, most notably they use average fare information but to not correct for price endogeneity. We use a novel database of airline tickets to estimate itinerary choice models using detailed fare data and compare these to classic itinerary choice models that use aggregate fare information but correct for price endogeneity. [less ▲]

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See detailBrain Trains: Intermodal Rail Freight Transport and Hinterland Connections - A Swot Analysis to Assess the Belgian Rail Practice
Troch, Frank; Vanelslander, Thierry; Sys, Christa et al

in Proceedings of the IAME Annual Conference 2015 (2015, August)

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. The scope of the research concentrates on port hinterland ... [more ▼]

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. The scope of the research concentrates on port hinterland flows. A large SWOT analysis of the current situation is conducted, starting from the actual weak usage of this mode of transport. Five different fields have been identified, impacting the economy and society. Each field indicates critical internal strengths and weaknesses for intermodal rail transportation in Belgium, and identifies possible future developments and setbacks. A Delphi-like approach is used, including a heterogeneous panel of experts discussing and validating the SWOT results. To prioritize the characteristics, a survey on the different SWOT elements was performed, asking the experts to rate each statement on its influence and likelihood of happening (level of uncertainty). [less ▲]

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See detailBifurcation Analysis of a Spacecraft Structure Using the Harmonic Balance Method
Detroux, Thibaut ULg; Renson, Ludovic ULg; Masset, Luc ULg et al

in Proceedings of the ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (IDETC/CIE 2015) (2015, August)

The harmonic balance (HB) method has been widely used in the past few years, as a numerical tool for the study of nonlinear models. However, in its classical formulation the HB method is limited to the ... [more ▼]

The harmonic balance (HB) method has been widely used in the past few years, as a numerical tool for the study of nonlinear models. However, in its classical formulation the HB method is limited to the approximation of periodic solutions. The present paper proposes to extend the method to the detection and tracking of bifurcations in the codimension-2 system parameters space. To validate the methodology, the forced response of a real spacecraft is examined. The paper first provides some numerical evidence of the presence of quasiperiodic oscillations and isolated solutions. It then demonstrates how the tracking of Neimark-Sacker and fold bifurcations can help get a deeper understanding of these attractors. [less ▲]

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See detailGeophysical Investigation of the Pb-Zn deposit of Plombières, Belgium
Evrard, Maxime ULg; Pirard, Eric ULg; Nguyen, Frédéric ULg

in André-mayer, anne-Sylvie; Cathelineau, Michel; Muchez, Philippe (Eds.) et al Mineral resources in a sustainable worl, proceeding, volume 5 (2015, August)

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See detailGenetic heritage of the Eastern Belgium Red and White breed, an endangered local breed
Colinet, Frédéric ULg; Bouffioux, Aude; Mayeres, Patrick et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailPhysical modeling of lateral dike breaching due to overtopping
Rifai, Ismail; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in River, Coastal and Estuarine Morphodynamics, RCEM 2015 (2015, August)

Dikes are commonly used as defense structures for river flow channelization, protecting population and property from floods and against lateral riverbed migration. However, the aging of these structures ... [more ▼]

Dikes are commonly used as defense structures for river flow channelization, protecting population and property from floods and against lateral riverbed migration. However, the aging of these structures, combined with their increased vulnerability to extreme hydrological events may cause the dikes to breach, and subsequently to break. Furthermore, statistics show that flow overtopping is the main cause of dike failure, which emphasizes the need to understand thoroughly the process of breaching. Indeed, from a risk management perspective it is particularly important to have a detailed understanding of the mechanisms (e.g. internal erosion, overtopping erosion) underlying the formation of breaches due to overtopping and reliable information on flows passing through them. Conversely, the current knowledge of breaching mechanisms remains fragmented, especially because dike failure involves complex interactions between flows, materials of the structure, soil and foundations. The existing studies have addressed partially these interactions as the considered idealized dikes were generally homogenous, the piping erosion unaccounted for and the overtopping replicated in a dam-break like configuration. Yet, river embankments are subjected to high flow velocities parallel to the direction of the dike and to flow in the floodplain, which highly influence the shape of the breach and its evolution. The objective of the present work is to fill this gap. A laboratory experimental investigation is planned in the National Laboratory for Hydraulics and Environment (LNHE) of EDF R&D (France) and in the research group Hydraulics in Environmental and Civil Engineering (HECE) of the University of Liege (Belgium), reproducing realistic configurations of river dikes, accounting for the tangential flow in both main channel and floodplain. It enables thus the assessment of, on the one hand, the effect of the increase of the water level, and on the other hand, the influence of waves. The laboratory tests also consider the effect of a surface layer and composition of the dike core by testing different material mixtures. Geometry and composition of the idealized dikes are representative of typical field dikes, based on the similarity theory. [less ▲]

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See detailOverview of possibilities and challenges of the use of infrared spectrometry in cattle breeding
Gengler, Nicolas ULg; Soyeurt, Hélène ULg; Dehareng, Frédéric et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailAgriculture Seen Through the Prism of the French Media in Belgium
Dubois, Charline ULg

in Firmino, Ana (Ed.) Smart answers for a smiling future (2015, August)

Scholars agree on the importance of the farming activities to maintain the quality (aesthetic environment) of rural areas. The number of farmers in Belgium fall steadily in the recent decades (Van Hecke ... [more ▼]

Scholars agree on the importance of the farming activities to maintain the quality (aesthetic environment) of rural areas. The number of farmers in Belgium fall steadily in the recent decades (Van Hecke et al. 2010). In particular, the rural systems of Wallonia transformed, characterized by the increased presence of landscapes of consumption and the influx of urban migrants. Why do they live in the countryside? Do they know the farmers in the area? What are the rural idylls (Yarwood 2005)? The answers to these questions lead to the understanding of perceptions and recognitions of rural spaces among different stakeholders. On another scale, this leads to the need for the improvement of social and territorial cohesion to improve the quality of life and the integration of people into their new living environment. The topics about “to live and to build the countryside” are current (Cawley & Gillmor 2008, Frelat-Kahn & Lazzarotti 2012) and are also concerned with the future of the countryside, of farming, and of the vitality of rural systems that face challenges according to geographic situations. With increasing suburbanization and multifunctionality (Bills & Gross 2005), some inhabitants want to build an interdependent community with authentic values. But the inhabitants’ representations about rural way of life are inexistent (despite some local initiatives such as organic produces) or complex (Dubois & Schmitz 2011, Tencati & Zsolnai 2012). Each person can say that he/she lives in the countryside by considering different space realities, with the risk that farmers could become strangers (Simard & Guimond 2013)! “Each year we organised a party in our street with everybody from the surrounding areas. Some farmers come and it is amazing to socialize more than just pass each other by cars and tractors” (inhabitant in a rural town in Wallonia). This study presents a first step in exploring inhabitant’s representations of the countryside. We analyse here the organic image about agriculture developed by the media that partly influences the people's perception of agriculture. Other than the induced and experienced images, organic image or “those that arise from supposedly unbiased sources” such as books, school education, television, documentaries, newspapers, and word of mouth (Gunn 1972, O'Leary & Deegan 2005) is considered. “People are interested about agricultural features. We speak a lot about that in the media, so people would like to know more about us and our job! That is why they visit us and they are sometimes so disoriented!” (Farmer in Wallonia). The analysis focuses on 3 consecutive even-numbered years: 2010, 2012 and 2014, from January to December. The national online press platform was used to access the articles. This allows for an analytical look at how agriculture is represented in the newspapers: What themes were addressed? How often? And to know the level of importance, in which part of the newspapers did it appear? The study analysed articles from 2 Belgian French newspapers from different media groups (Le Soir, La Libre). Different regions were covered to take into account different agro-geographical landscapes, suburban and rural features of the countryside, and different social and economical realities of Wallonia. For each article, topic selection and content analysis (NVivo ) were undertaken. Bette (2012) made the first analysis of the topic in 2012 and put into evidence 13 different categories in which agriculture has been presented: organic, diversification, legislation, economy, crops, farming, food, biotechnology, energy, animal health, plant diseases, environment, other. However, for this research, we improved the typology and add other topics such as the tourism, the local produces, the (agro-) geographical regions. Qualitative analysis showed that economic difficulties, economic investment, local produces, slow food, European policies, environment are among the categories frequently explored. All the different categories were represented and were often sensationalised but the level of importance is not high as most news were often found inside the newspaper and not on the front page. These different elements influence the representations of the different readers and give an overview about the influence of images of agriculture on the inhabitants. Agriculture is related to multiple components but some of these aspects are not presented and remain unknown to the common public. A lot of other questions about agricultural and rural systems and agricultural regions are not covered because on-going social, economic environmental and cultural trends tend to influence the information that are found in the newspapers. Agriculture is often simplified in a positive (e.g. local products, organic farming) and in a negative way (e.g. pollutions, bankruptcies, suicides) which implied that it is difficult for laymen to have a valid representation based on newspapers. [less ▲]

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See detailGenetic analysis to support the re-establishment of the Kempen breed
François, Liesbeth; Janssens, Steven; Colinet, Frédéric ULg et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailComparison between thermographic and holographic techniques for nondestructive testing of composites: similarities, differences and potential cross-fertilization
Georges, Marc ULg

in Mendoza Santoyo, Fernando (Ed.) SPECKLE 2015: VI International Conference on Speckle Metrology (2015, August)

Thermography and different variants of holography (holographic interferometry, speckle interferometry, shearography) are full-field non-contact techniques which are used in nondestructive testing ... [more ▼]

Thermography and different variants of holography (holographic interferometry, speckle interferometry, shearography) are full-field non-contact techniques which are used in nondestructive testing applications. In particular they are attractive for damage detection in composite materials compared to other methods measuring in one point and which require scanning and contact with the samples, like ultrasounds. Currently thermography is a step forward compared to holographic techniques for this application. Indeed it is easier to interpret. Many thermography configurations and variants exist, from exciting sources to post-processing. Such a variety exists also among the holographic techniques but to a less extent. We will see how these techniques can share some aspects and what distinguish them. Also the complementarity of both will be addressed and how to combine them. At last we will discuss how processing developed for thermography can benefit to holography and vice-versa, specifically in the domain of composite materials. [less ▲]

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See detailEthnic Differences in Travel Time Expenditure
Cools, Mario ULg; Eftekhar, Hamed ULg

in Ethnic Differences in Travel Time Expenditure (2015, July 23)

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See detailA viscoelastic-viscoplastic-damage constitutive model based on a large strain hyperelastic formulation for amorphous glassy polymers
Nguyen, Van Dung ULg; Morelle, Xavier; Lani, Frédéric et al

in proceedings of the 20th International Conference on Composite Materials, Copenhagen, Denmark, 19-24th July 2015 (2015, July 20)

The aim of this work is to develop an efficient large-strain hyperelastic constitutive model for amorphous polymers in the glassy state. These materials exhibit a complex rate- and pressure-sensible ... [more ▼]

The aim of this work is to develop an efficient large-strain hyperelastic constitutive model for amorphous polymers in the glassy state. These materials exhibit a complex rate- and pressure-sensible behavior in both elastic and plastic regimes. After an initial linear elastic region, a nonlinear stage continues until reaching a peak stress, which is followed by a softening stage. At large strains, when the softening is saturated, a re-hardening stage is reached. The viscoelastic effect is captured using the generalized Maxwell model. The viscoplastic effect is considered using a Perzyna-type flow rule incorporating a pressure sensitive yield surface and a non-associated flow potential. This yield surface is extended from the Drucker-Prager one. The saturated softening phenomenon is modelled using an isotropic numerical damage variable progressed by a saturated softening law. With the introduction of the damage parameter, a non-local implicit gradient damage model is used to avoid the loss of the solution uniqueness. Through experimental comparisons, it is shown that the proposed model has the ability to model the complex mechanical responses of amorphous glassy polymers. [less ▲]

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See detailModelling Uncertainties in Long-Term Predictions of Urban Growth: A Coupled Cellular Automata and Agent-Based Approach
El Saeid Mustafa, Ahmed Mohamed ULg; Saadi, Ismaïl ULg; Cools, Mario ULg et al

in Ferreira, Joseph; Goodspeed, Robert (Eds.) Proceedings of CUPUM 2015 (2015, July 07)

Modelling the growth of urban settlements is of considerable interest for different applications, amongst which integrated flood management. This study aims at modelling urban growth for a long time ... [more ▼]

Modelling the growth of urban settlements is of considerable interest for different applications, amongst which integrated flood management. This study aims at modelling urban growth for a long time horizon up to 2100 and to integrate the model outcomes with a hydrological model for the same time horizon. Forecasting land-use change over such time frames entails very significant uncertainties. In this regard, the main focus of this paper is attributed to the handling of uncertainty in an urban growth model. To this end, we examine a Monte Carlo Simulation method, which is integrated in the proposed urban growth model. Transition probabilities for each non-urban cell are estimated by a coupled Cellular Automata-Agent-Based ap-proach. The results help to handle uncertainty over long time horizons and to assess the increment in degree of uncertainty at every time-step. [less ▲]

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See detailSuppression of simulated self-excited oscillation using smart materials on flexible wing structure
Abdul Razak, N.; Nasip, N. S.; Hawari, A. F. et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, July 01)

Suppression of simulated self-excited oscillation due to aeroelastic effects using piezoelectric patches is reported. The focus of the present work is suppressing simulated flutter oscillation using ... [more ▼]

Suppression of simulated self-excited oscillation due to aeroelastic effects using piezoelectric patches is reported. The focus of the present work is suppressing simulated flutter oscillation using piezoelectric patches bonded to the wing structure. First, a clean wing is exposed to airflow in the wind tunnel where it experienced limited amplitude oscillation. The responses were recorded. This is followed by bonding piezoelectric patches to the identical wing that was tested in the wind tunnel. Two of the patches were used as actuators to simulate self-excited oscillation in a control manner. The selected mode for excitation is 1st bending mode. The other two patches were used as suppressor for active control using negative velocity feedback Single-Input, Single-Output approach. The single input signal for negative feedback is also sensed using piezoelectric patches. The controller manages to suppress the simulated flutter response to a lower oscillation amplitude values. This works demonstrated the used of piezoelectric material as actuator to reproduce the oscillation amplitude during self-excited oscillation and suppress the oscillation at the same time. [less ▲]

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See detailA new test of uniformity for object orientations in astronomy
Pelgrims, Vincent ULg

in Heavens, A. F.; Starck, J.-L.; Krone-Martins, A. (Eds.) Statistical Challenges in 21st Century Cosmology (2015, July 01)

We briefly present a new coordinate-invariant statistical test dedicated to the study of the orientations of transverse quantities of non-uniformly distributed sources on the celestial sphere. These ... [more ▼]

We briefly present a new coordinate-invariant statistical test dedicated to the study of the orientations of transverse quantities of non-uniformly distributed sources on the celestial sphere. These quantities can be projected spin-axes or polarization vectors of astronomical sources. [less ▲]

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See detailMaking "Place" count in Risk perception studies
Ocampo, Lou Angeli ULg; Schmitz, Serge ULg

in Firmino, Ana (Ed.) Book of Abstracts and Programme: 23rd Annual Colloquium on Sustainable Rural Systems: Smart Answers for a smiling future (2015, July)

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See detailSketch-based and parametric modeling: Association of two-externalization processes for early daylight optimization
Gallas, Mohamed Anis ULg; Delfosse, Vincent ULg

(2015, July)

This paper focuses on sketch-based and parametric modeling as two externalization devices used in architectural design practice. The first part of this paper addresses features and ability of these ... [more ▼]

This paper focuses on sketch-based and parametric modeling as two externalization devices used in architectural design practice. The first part of this paper addresses features and ability of these externalization tools to support design activities during the early design steps. The second part proposes an association process of a sketch-based modeling tool (SketSha-Archi®) and a parametric modeling tool (Grasshopper®) to create an advanced process for daylight optimization. The process aimed to associate the hand-sketching freedom with the precise exploration functions of digital tools (parametric modeling and evaluation tools). [less ▲]

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See detailComparison of experimental results and numerical modelling of unreinforced load-bearing masonry structures subjected to earthquake loading
Mordant, Christophe ULg; Denoël, Vincent ULg; Degée, Hervé

in Proceedings of the SECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World (2015, July)

This paper presents a comparison of experimental tests results on unreinforced load-bearing masonry structures subjected to earthquake loading with numerical predictions. First, simple walls are submitted ... [more ▼]

This paper presents a comparison of experimental tests results on unreinforced load-bearing masonry structures subjected to earthquake loading with numerical predictions. First, simple walls are submitted to cyclic and shaking table tests. Some of them include soundproofing devices in order to investigate their influence on the general behaviour in static and dynamic conditions. Additional walls with an opening and T-shaped walls are then tested under cyclic loading. The study is focused on the frame effect, the contribution of the perpendicular wall to the global strength and the efficiency of the connection. These aspects are also studied through shaking table tests on two masonry frames with T- or L-shaped piers. The main information is expressed in terms of force-displacement curves, mechanical properties and energy dissipation for the cyclic tests. The shaking table tests provide results in terms of dynamic and mechanical properties. Comparison of the results with numerical predictions is finally performed thanks to the software TREMURI. [less ▲]

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See detailMarcel-Henri Jaspar, "Le plus gaullien des Belges" ? Construction et déconstruction d'une réputation (1940-1966)
Genin, Vincent ULg

in Lanneau, Catherine; Depagie, Francis (Eds.) De Gaulle et la Belgique (2015, July)

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See detailEtude de l'évolution de l'enneigement dans les Hautes Fagnes (Belgique) au cours des cinquante dernières années à l'aide du modèle climatique régional MAR
Wyard, Coraline ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

in Erpicum, Michel (Ed.) Actes du XXVIIIe colloque annuel de l’Association Internationale de Climatologie : Modélisations et variabilités (2015, July)

The “Modèle Atmosphérique Régionale” MAR is a regional climate model originally developed to study the polar ice sheets. In this study, the MAR model has been adapted to Belgium in order to study the snow ... [more ▼]

The “Modèle Atmosphérique Régionale” MAR is a regional climate model originally developed to study the polar ice sheets. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolution of the High Fens (east of Belgium), a region covered by snow on average one to two months per year. As validation, we have sucessfully compared MAR based daily snow heights with snowcam-based and/or laser sensor-based observations over the period 2008-2013. Then, the model has been forced by ERA-Interim since 1958 to study the snow cover evolution during the last fifty years at the summit of Belgium. The results show no significant trend despite global warming. [less ▲]

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See detailWe forgot to pay attention to ordinary tourism! A call to revise the research agenda for rural tourism
Schmitz, Serge ULg; Crozat, Dominique

in Firmino, Ana (Ed.) Book of Abstracts and Programme: 23rd Annual Colloquium on Sustainable Rural Systems: Smart Answers for a smiling future (2015, July)

This paper aims to suggest a new research agenda for rural tourism, including for a smiling future for the countryside, in reversing the current trend to distinguish the destination, to aim at ... [more ▼]

This paper aims to suggest a new research agenda for rural tourism, including for a smiling future for the countryside, in reversing the current trend to distinguish the destination, to aim at supersegmentation of tourism and to target a cultural, elitist, tourism. Indeed most tourist activities can be done and are done in a relative vicinity, by ordinary tourists aiming to have a good time. Moreover, the countryside does not always offer extraordinary sights that attract people from the whole continent. We argue that there should be a place and more attention for ordinary tourism development. By ordinary tourism, we do not mean mass tourism but just the fact that some people spent a few days away from home. We do not want to reject the appealing concepts of cultural tourism, ecotourism, adventure tourism, ethnic tourism, gastronomic tourism, farm tourism and so on. We just want to be realistic and call to rethink the importance of ordinary tourism and its current challenges: facing new ways of traveling (e.g. Low cost), of buying vacation (e-commerce), of enjoying holidays (more frequently/with friends, alone or with the family/ being active or passive). [less ▲]

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See detailHybrid processing of SCADA and synchronized phasor measurements for tracking network state
Alcaide-Moreno, Boris; Fuerte-Esquivel, Claudio; Glavic, Mevludin ULg et al

in Proc. IEEE PES General Meeting (2015, July)

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements ... [more ▼]

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements. The latter are assumed to be available in limited number. To avoid time skew effects, only the SCADA measurements received since the last execution of the estimator are processed. To ensure observability, estimated SCADA measurements are used as pseudo-measurements. The procedure includes a prediction, an innovation analysis and a correction step. The latter consists of solving a constrained least-squares optimization. The simulation results refer to a test system undergoing large disturbances, evolving to long-term voltage instability or stabilized by emergency control. The proposed method appears to satisfactorily track the overall network evolution, even during those severe conditions. [less ▲]

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See detailiPot: Industrial Potato monitoring for the Belgian potato sector using remote sensing and crop growth modelling
Wellens, Joost ULg

in Qu, Dongyu (Ed.) Develop Together for a Better Future (2015 Beijing World Potato Congress) (2015, July)

The Belgian potato processing industry has known a spectacular growth during the last decades. The companies active in this sector (most of them family owned enterprises) have succeeded – together with ... [more ▼]

The Belgian potato processing industry has known a spectacular growth during the last decades. The companies active in this sector (most of them family owned enterprises) have succeeded – together with primary producers and traders – to grow from 500.000 tons of processed potatoes in 1990 till 3.650.000 tons of raw material in 2012. When considering the production (in tons) per habitant, Belgium is ranked on the 4th place with a production of 395 tons per 1.000 inhabitants. Nowhere in the world are higher yields obtained than in Belgium. To keep up its position on the forefront of innovation, the potato processing industries are continuously looking at promising novel technologies that could improve business processes at any stage of growth. The close follow up of parcels on the land as form above is becoming an important tool to improve the quantity and the quality of the potato crop, and reduce the risks in order to plan the storage, packaging or processing and as such to strengthen the competiveness of the Belgian potato in a global market. The iPot project, financed by the Belgian Science Policy Office (BELSPO), aims to provide the Belgian potato sector, represented by Belgapom, with near real time information on field condition (weather-soil) and crop development, and with early yield estimates, derived from a combination of satellite images and crop growth models. Satellite images are used since long for crop monitoring at regional level by the public sector. Traditionally, low to medium resolution images, with pixel sizes from 250m to 1km are used for providing information on crop growth and development, and on yield at regional scale. However, the recent launch of constellations of high resolution optical sensors (DMC, Sentinel-2) offering spatially detailed information (20m pixel size) at high frequency (every 2 to 3 days) and at low cost, is creating a (r)evolution in the world of crop monitoring. Automatic processing chains have been developed to derive vegetation indices (NDVI) and biophysical parameters (fAPAR, LAI, fCover). Maps are being derived on a regular basis with for each pixel the actual development stage of the potato crop. This on-line scanning of the growth (phenology) is expected to result in an increased performance of crop growth models and better yield predictions. Once the data for crop phenology are incorporated into the model (B-CGMS), the yield data collected at the parcel level will be assimilated into the model using optimization algorithms to minimize the discrepancies between observed and simulated yield time series in order to improve further yield estimations. The combination of these new earth observation and modelling techniques arose the interest of a new type of users, mainly from the private sector (agro-industry, agricultural insurers, etc.). The iPot project aims to bridge the gap between the latest research efforts regarding crop growth monitoring and the industry. An intuitive web based geo-information platform is being developed to allow both the Belgian potato industry and research centers to access, analyze and combine the data with their own field observations in closed collaboration with the farmers, for improved decision-making. [less ▲]

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See detailTentatives de prétraitement des granulats recyclés pour l’amélioration des bétons préfabriqués
Zhao, Zengfeng ULg; Courard, Luc ULg; Remond, Sébastien et al

in Ciments, bétons et fibres - Matériaux et structures (2015, July)

De très grandes quantités de déchets de construction et de démolition sont produites chaque année. Jusqu'à présent, seule une petite fraction de ces déchets de béton est réutilisée sous forme de granulats ... [more ▼]

De très grandes quantités de déchets de construction et de démolition sont produites chaque année. Jusqu'à présent, seule une petite fraction de ces déchets de béton est réutilisée sous forme de granulats pour la fabrication de béton. Afin de faire bon usage des granulats recyclés (GR) dans le béton, il est très important d’améliorer leurs propriétés. Dans cette étude, une méthode de traitement des GR au moyen d’une carbonatation accélérée en laboratoire et des méthodes de traitement par modification de l’état de surface des GR ont été étudiées. Les résultats montrent qu'après la carbonatation accélérée au laboratoire, la teneur en pâte de ciment durcie des GR mesurée par dissolution de l'acide salicylique diminue, que la densité et la surface spécifique des GR augmentent et que la porosité des GR diminue, ce qui conduit à la réduction de l'absorption d'eau des GR. Des agents hydrofuges à base de silane ont également été étudiés et semblent diminuer l’absorption d’eau par les GR. [less ▲]

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See detailComparative study of different output metrics for a three weakly coupled resonator sensor
Zhao, Chun; Wood, Graham; Xie, J.B. et al

in Proceedings of Solid-State Sensors, Actuators and Microsystems (Transducers 2015) (2015, July)

This work, for the first time, investigates the characteristics of different output metrics for a three degree-of-freedom (DoF) coupled resonator sensor. The main aspects examined are sensitivity and ... [more ▼]

This work, for the first time, investigates the characteristics of different output metrics for a three degree-of-freedom (DoF) coupled resonator sensor. The main aspects examined are sensitivity and linear range. It is shown from electrical measurements that using the vibration amplitude ratio as an output signal provides improved sensitivity and linearity range, compared to other methods such as shift in eigenstate, mode frequency or amplitude difference. [less ▲]

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See detailAre there different analysis paterns when people assess rural landscapes?
Vanderheyden, Vincent ULg; Schmitz, Serge ULg

in Firmino, Ana (Ed.) Book of Abstracts and Programme: 23rd Annual Colloquium on Sustainable Rural Systems: Smart Answers for a smiling future (2015, July)

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See detailUsing 2D-PIV measurements to compute unsteady aerodynamic loads on a flat plate at high angle of attack
Guissart, Amandine ULg; Bernal, Luis; Dimitriadis, Grigorios ULg et al

in Proceedings of the 16th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, June 30)

This work exposes and discusses results obtained for aerodynamic forces using an indirect calculation based on Particle Image Velocimetry (PIV) measurements. The methodology used is based on the integral ... [more ▼]

This work exposes and discusses results obtained for aerodynamic forces using an indirect calculation based on Particle Image Velocimetry (PIV) measurements. The methodology used is based on the integral formulation of the Navier-Stokes equations and is applied to spatio-temporal data for different flows around a plate with a 16:1 chord-to-thickness ratio at high angle of attack. Experimental data are obtained in a water channel for both a static and a pitching plate. In addition to PIV data, direct measurements of aerodynamic loads are carried out to assess the quality of the indirect calculation. It is demonstrated that this indirect method is able to compute the mean and the temporal evolution of the lift and drag coefficients with a reasonable accuracy. It is also shown that the noise sensitivity of the method can be partly alleviated through the use of Dynamic Mode Decomposition (DMD) as a pre-processing step to smooth the spatio-temporal data. [less ▲]

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See detailAsymmetric limit cycle oscillations in systems with symmetric freeplay
Dimitriadis, Grigorios ULg

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, June 30)

In this paper, a simple 2D aeroelastic system with degrees of freedom in pitch, plunge and control surface deflection is investigated with freeplay in the pitch degree of freedom. It is shown that this ... [more ▼]

In this paper, a simple 2D aeroelastic system with degrees of freedom in pitch, plunge and control surface deflection is investigated with freeplay in the pitch degree of freedom. It is shown that this system features a fixed point at the origin as well as two anti-symmetric fixed points. Asymmetric limit cycles that span only two of the three piecewise linear subdomains of the phase plane can orbit these anti-symmetric fixed points. A single three-domain symmetric cycle and two two-domain cycles appear as a result of a grazing bifurcation occurring at the flutter speed of the underlying linear system. The two-domain cycles can undergo further fold, period doubling and torus bifurcations. They can cause both periodic and aperiodic oscillations, including highly chaotic responses at parameter values where they interact strongly. [less ▲]

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See detailTheoretical and experimental investigation of a structurally and aerodynamically nonlinear pitch and flap wing
Verstraelen, Edouard ULg; Boutet, Johan ULg; Grappasonni, Chiara ULg et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, June 29)

This paper presents and experimental and theoretical investigation of a novel nonlinear aeroelastic system. It consists of a wing with pitch and flap degrees of freedom, suspended from a leaf spring ... [more ▼]

This paper presents and experimental and theoretical investigation of a novel nonlinear aeroelastic system. It consists of a wing with pitch and flap degrees of freedom, suspended from a leaf spring secured in a nonlinear clamp. Both the structural and the aerodynamic forces acting on the wing can be nonlinear, depending on the amplitude of oscillations. Wind tunnel experiments show that the system undergoes a supercritical Hopf bifurcation that leads to small amplitude limit cycle oscillations. At a particular airspeed, the pitch amplitude jumps to a much higher value and dynamic stall starts to occur. Three mathematical models of the system are formulated, one based on linear aerodynamics and two based on the Leishman-Beddoes dynamic stall model. The objective of the modelling is to determine whether the jump in pitch oscillation amplitude is due to dynamic stall. The predictions for amplitude, frequency and mean angle of the limit cycle oscillations are compared to the experimental observations. All three models predict the small amplitude oscillations with satisfactory accuracy. The complete Leishman-Beddoes model predicts the occurrence of a jump in pitch amplitude but the magnitude of this jump is signi cantly overestimated. The other two models completely fail to model the jump. The failure of the Leishman-Beddoes model to predict the correct post-jump oscillation amplitude may be due to the values selected for the model parameters. [less ▲]

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See detailA comparative study for simulation of heat transport in large district heating network
Sartor, Kevin ULg; Thomas, David ULg; Dewallef, Pierre ULg

in Prooceedings of ECOS 2015 (2015, June 29)

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See detailUnsteady Viscous-Inviscid Coupling Simulations of Separated Laminar Flows Around 2D Airfoils
Rothkegel Ide, José Ignacio ULg; Dimitriadis, Grigorios ULg

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, June 29)

An interactive boundary layer model has been developed in 2D in order to solve the unsteady flow around an airfoil. The inviscid problem is solved using a panel method, by the discretization of the ... [more ▼]

An interactive boundary layer model has been developed in 2D in order to solve the unsteady flow around an airfoil. The inviscid problem is solved using a panel method, by the discretization of the airfoil into linear-varying vortex panels. The solution of the boundary layer equations is carried out using a finite volume scheme. Viscous-inviscid coupling is preformed by imposing a permeation velocity on the skin panels of the airfoil and the addition of a free wake at each separation point. [less ▲]

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See detailOverview and recommendation on urban densification potential in Liège, Belgium
Attia, Shady ULg

in AEE INTEC (Ed.) High-quality retrofit and redensification with timber construction systems (2015, June 18)

Belgium, like many European Countries, has a serious challenge in the housing sector. The Federal planning bureau estimates the increase of population by one million inhabitants by 2030, which represent ... [more ▼]

Belgium, like many European Countries, has a serious challenge in the housing sector. The Federal planning bureau estimates the increase of population by one million inhabitants by 2030, which represent 600.000 additional family requiring accesses to new housing facilities. Population ageing (mainly due to increasing life expectancy) combined with a constant growing rate of individuals living in collective households, leads to a substantial increase of demand of collective households (Vandresse & Bureau, 2013). This highlights a substantial challenge underlined mainly in the need to live in cities, which as consequence will increase the demand for smaller housing with or without integrated services or equipment in common. Furthermore, the stringent European performance environmental regulations for the building sector require that by 2020, all new construction are zero or nearly zero energy, (equivalent to 15 kWh/m2/year), with 60% efficient on-site coverage by renewable energy. The shortage of vacant land and the increasing energy performance requirements is pushing the idea of urban densification and zero energy construction households. During the recent 6 years, there has been a trend to use timber frame constructions as a sustainable solution facing the economic and environmental crisis in Belgium. However, there is lack of knowledge on the design, construction and operation of zero energy lightweight constructions for urban densification. The goal of this research is to provide an overview and recommendation on urban densification potential in Liège Province. The focused aim is to demonstrate validated design prototypes and products of different zero energy, timber frame construction systems and composite components. Thus inform and support the decision making of policy makers, municipalities, developers, and architects and building engineers in Belgium. [less ▲]

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See detailScreening and analyzing retrofit systems for zero energy renovation and their potential application in Liège, Belgium
Attia, Shady ULg

in AEE INTEC (Ed.) High-quality retrofit and redensification with timber construction systems (2015, June 18)

Retrofit systems for Zero Energy Renovation comes energy as the most topical subject in the Belgian construction sector. Concepts and solutions for zero energy renovation are a new topic. Since 2006 ... [more ▼]

Retrofit systems for Zero Energy Renovation comes energy as the most topical subject in the Belgian construction sector. Concepts and solutions for zero energy renovation are a new topic. Since 2006, Belgium has been striving to achieve the European ambitions of fulfilling the Kyoto Protocol by insulating more effectively and reducing CO2 emissions associated with the use of fossil fuel for operational and embodied energy in buildings. In 2011, a Belgian decree mandated the construction of nearly zero and nets zero energy buildings by 2020. Following the German PassivHaus Standard performance requirements the Belgian residential sector is aiming to achieve an energy consumption to less than 15 kWh/m2/year and an onsite renewable energy production up to 60% for every newly construct household. In this, context the study will build on grounded knowledge developed and implemented by the IEA ECBCS Annex 50: Prefabricated Systems for Low Energy Renovation of Residential Buildings. The goal of this research is to screen and select a series of envelope retrofitting solutions. The focused aim is to demonstrate validated envelope prototypes and products of different zero energy, timber frame construction systems and composite components. This will include the comparison of timber retrofit systems with conventional systems. Thus inform and support the decision making of policy makers, municipalities, developers, and architects and building engineers in Belgium. [less ▲]

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See detailWood, the material of tomorrow's retrofits
Ruellan, Guirec ULg; Attia, Shady ULg

in High-quality retrofit and redensification with timber construction systems (2015, June 18)

The construction sector has focused for many years on performance improvement of new constructions. Today's largest problem is the energetic retrofitting of existing buildings. The building retrofit is an ... [more ▼]

The construction sector has focused for many years on performance improvement of new constructions. Today's largest problem is the energetic retrofitting of existing buildings. The building retrofit is an important strategy for energy savings. Building retrofit is addressed towards the real estate in Europe and allows for substantial gains, especially for heating houses and urban densification. However retrofit requires the use of special construction techniques. The problem is quite different from that of the new buildings: adaptation to existing building, heritage conservation, elimination of thermal bridges, etc. In this context, wood is experiencing strong growth in its use in new constructions, due to its qualities. And we think that some of those allow more appropriate responses to retrofit than other traditional materials. In this study, we will first present succinctly the problems related to the renovation, then we will dedicate ourselves to define the characteristics of the wood. The focus will be on some problems that commonly arise in wood constructions. We will then discuss a case, highlighting different characteristics of wood that are particularly important in this particular renovation. This allows us to observe on the ground the coherence of the choice of wood in the renovation. A discussion will close the study by summarizing the advantages and limitations of the use of wood in the renovation This is not to show that wood is one of the most environmentally friendly building materials, or demonstrate the sustainable character of retrofit. This is to see that the timber construction systems can provide an adequate response to many retrofit issues. [less ▲]

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See detailCompétition partisane, changement climatique et écologie politique : convergences et conflits sur les thématiques politiques
Piet, Grégory ULg

in Flipo, Fabrice (Ed.) Les actes du Colloque "Penser l'écologie politique" (2015, June 16)

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See detailEVALUATION OF CONTINUOUS SUPRASCAPULAR NERVE BLOCKADE IN THE TREATMENT OF REFRACTORY ADHESIVE CAPSULITIS : A RETROSPECTIVE STUDY
MUTSERS, Pierre ULg; LECOQ, Jean-Pierre ULg; GOFFIN, Pierre ULg et al

in Abstract Book du Residence Meeting de la Société Belge d'Anesthésie (2015, June 15)

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See detailIs it possible for large herds to graze while keeping a high milk yield level? The experience of two Belgian dairy farms.
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

in van den Pol-van Dasselaer, Agnes; Aarts, H.F.M; De Vliegher, Alex (Eds.) et al Grassland and forages in high output dairy farming systems (2015, June 15)

Grazing is more and more abandoned because of increasing size of herds and automation of herd management (e.g. automatic milking system – AMS). In this context, this study aims to evaluate milk production ... [more ▼]

Grazing is more and more abandoned because of increasing size of herds and automation of herd management (e.g. automatic milking system – AMS). In this context, this study aims to evaluate milk production and composition of 2 large Belgian dairy herds equipped with AMS during winter and summer. These herds were followed over 2 years. At grazing, 30% of the offered feed was grass. Milk production in both herds was similar in summer and winter (30.2 ± 7.14 vs 29.7 ± 7.8 ± in Herd 1 and 26.9 ± 0.8 vs 26.4 ± 0.8 in Herd 2) while their milk composition differed. In conclusion, it is possible for grazing to be preserved even in large herds without impacting noticeably on the herd performance. [less ▲]

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See detailRegional crop and irrigation monitoring: some examples of (new) opportunities
Wellens, Joost ULg

in Begian workshop: Space4Food (2015, June 11)

Satellite images are used since long for agricultural monitoring at different spatial scales: from continental, national to regional and even field level. Combined with agro-meteorological data and ... [more ▼]

Satellite images are used since long for agricultural monitoring at different spatial scales: from continental, national to regional and even field level. Combined with agro-meteorological data and simulation models they constitute powerful decision support tools for agriculture throughout the world. Some examples at different scales and domains are presented. In Burkina Faso, free MODIS time series of coarse resolution vegetation indices (NDVI), phenological and meteorological data are combined in a multiple regression analysis for early yield warning in the cotton industry. Using a limited amount of data, it allows a decent yield forecasting more than a month before harvest. Time series of ERS radar images are analysed to monitor water intakes on the irrigated perimeter of Tadla (Morocco). The back-scatter intensity gives a clear indication of the top soil moisture state, permitting irrigation managers a regional monitoring of the irrigation water distribution and a guidance in the water allocation pricing. Actually in Belgium, and soon to be exported elsewhere, very-high resolution imagery (SPOT-5 Take5) are used to observe crop canopy development (fAPAR, fCover) on field level. Either by curve-fitting functions or assimilating these satellite derived data in existing crop growth models, improved and spatially more detailed forecasting systems are being developed. Although mostly still in the domain of applied research, the new availability of high spatial and temporal resolution imageries such those that will provide the Sentinel satellites paves the way to a growing number of operational end users. [less ▲]

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See detailCHRONIC TOXIC HEPATITIS IN BEEF CALVES DUE TO MYCOTOXINS CONTAMINATION IN MIXED FEED
Theron, Léonard ULg; Callebaut, Alfons; Bayrou, Calixte ULg et al

in Zemljic, Borut; Podpecan, Ozbalt; Zmljic-Jokhadar, Spela (Eds.) Proceedings of the XV middle European Buiatric Congress (2015, June 10)

Mycotoxins intoxination is an emerging disorder in Belgium, due to evolution of cultural practices and harvesting weather conditions. These intoxinations are difficult to diagnose for the vet practioners ... [more ▼]

Mycotoxins intoxination is an emerging disorder in Belgium, due to evolution of cultural practices and harvesting weather conditions. These intoxinations are difficult to diagnose for the vet practioners, since unspecific clinical signs, and their impact on ruminant disorder remains controversial. Although legal concentrations have been established for mycotoxins in the EU, farm forages are most of the time not tested (EU 2006/576/EC). In January 2015, a 500 calvings cross-bred Belgian blue cattle herd (BVDV free) referred a second (the first was directly sent to the rendering-plant) unexplained fatal case of jaundice on a 2 months-old calf to the Clinic for Ruminants of the University of Liège for necropsy. In 2013, a case of jaundice due to a Salmonella dublin hepatocholecystitis had previously diagnosed in this farm (Ronzoni et al., 2014), but so far preventions measures were implemented. Necropsy revealed generalized icterus, mild bilirubinuria, splenomegaly, but no precise etiology. On February a second 2 month old calf with jaundice is referred, lethargic, normothermic with a mild diarrhea, Calf shown generalized jaundice, anemia, elevation of leukocytes (neutrophils, eosinophils and monocytes), TGO, bilirubinemia, total biliary acids and Globulins (alpha2). He had also diminished erythrocytes and albuminemia. Copraemia, leptospirosis serology, leademia, hemoculture and pancreatic enzymes were within normal ranges, ruling out classic causes of jaundice in calf. Abdomen ultrasonography revealed a mild hyperechogenicity of the liver but no gall bladder modifications. Symptomatic treatment was based on symptoms, with fluidotherapy and choleretics. A third calf was referred three days after in a worst clinical condition, with also a severely modified liver enzymes, but no anemia. Three days after, this calf died and a necropsy revealed petechiae and hemorrhages in the abomasum, congestive mucosae in the distal bowel, white depot in the kidney medulla, modified urine and splenomegaly. Bile bacteriology and leptospirosis PCR was negative and liver histopathology revealed a severe histopathological liver degeneration associated with a disruption of the parenchyma and marked hyperplasia of the bile ducts compatible with chronic metabolic disorder. Meanwhile, the anemic calf recovered from anemia without any treatment after 4 days and was discharged from the Clinic for Ruminants. Considering the weird clinical patterns of these jaundice cases, and the fact that only calves from 2 to 3 months were affected, a nutritional origin as etiology was suspected. To test it, eight clinically healthy two to three months-old calves, of two different pens were sampled. TGO, GLDH, GGT or biliary acids were either modified and the values tended to increase with the age of the calves. The water was analyzed for classic toxics, and cultured for total germ content and everything were within recommended values. The calves fed with a milk replacer (30 % milk powder), and a commercial calf starter until one month of age. Then, they were given a mixed feed (containing cereal mix, cocoa, beet pulp, soja, maize), made at the farm from primary product/byproducts bought from different sources. The mix was tested for mycotoxins presence and ranged from 0.8 to 1.5 ppm of Desoxynivalenone (DON), and 115-215 ppb of Zearalenone (ZEA). The principal source of DON was maize (3.1 to 6.2 ppm), as for ZEA (0.3-0.6 ppm), but several compounds contained small dose of DON (0.2-0.7 ppm) for Barley feed, Tanned soja. Cacao contained 2.7 to 5.9 ppb of Ochratoxine (OTA). Nutritionnal recommendations were immediately given with a change in the source of maize and an addition of clay and yeast at 40g/calf/day and hay. Since, any other hypothetic origin to this progressive hepatic intoxination was demostrated, and that the doses founded, even if barely legal in the mix, are not accounted for toxic in the EU regulation, we believe that the calves were chronically exposed to these toxins. However, some mycotoxins experts still claim that various clinical signs would be observed in ruminants, if the rumen is partially defaunated, like in our case with the lake of forage. We propose that monitoring of subclinical liver health could be a key to screen DON effects. [less ▲]

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See detailQuelques écueils à éviter lors de la rédaction et la publication d'un règlement-taxe
Bortolotti, Aurélien ULg

in Le droit communal - Etat des lieux (2015, June 05)

La présente contribution a pour seule ambition d’énoncer et d’expliquer les écueils à éviter lors de la rédaction et de la publication d'un règlement-taxe. Il ne sera, par conséquent, pas question de ... [more ▼]

La présente contribution a pour seule ambition d’énoncer et d’expliquer les écueils à éviter lors de la rédaction et de la publication d'un règlement-taxe. Il ne sera, par conséquent, pas question de rappeler les principes généraux en la matière, mais au contraire d’envisager les problèmes récurrents soulevés devant les juridictions administratives et judiciaires. Nous analyserons successivement la motivation du règlement-taxe, sa rétroactivité, sa publication ainsi que le respect de la procédure de taxation d’office. Ensuite, nous examinerons la procédure de contestation de ces impôts. Nous rappellerons, à cette occasion, le délai pour introduire une réclamation administrative, mais également la représentation de l’autorité locale devant les instances judiciaires. Nous clôturerons notre analyse par la question de l’indemnité de procédure et plus particulièrement les questions préjudicielles récemment posées par le tribunal de première instance d’Arlon à la Cour constitutionnelle. Ce domaine n’échappant pas à la régionalisation des compétences, il convient préalablement d’envisager la manière dont les différents législateurs régionaux réglementent les principes applicables à ces perceptions tout en conservant à l’esprit que la loi du 24 décembre 1996 relative à l'établissement et au recouvrement des taxes provinciales et communales reste la colonne vertébrale de ces réformes. [less ▲]

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See detailModélisation de la remontée des eaux dans les anciennes mines de charbon : un outil pour détecter les seuils de risques d’inondation en plaine alluviale de la Meuse près de Liège (Belgique)
Dassargues, Alain ULg; Wildemeersch, Samuel; Orban, Philippe ULg et al

in Des villes et des territoires sobres et sûrs, Synthèse des interventions (2015, June 03)

La plaine alluviale de la Meuse occupe la partie centrale du bassin charbonnier de Liège. Durant les exploitations minières, les niveaux d’eau des aquifères avaient été rabattus par des pompages d’exhaure ... [more ▼]

La plaine alluviale de la Meuse occupe la partie centrale du bassin charbonnier de Liège. Durant les exploitations minières, les niveaux d’eau des aquifères avaient été rabattus par des pompages d’exhaure. Des galeries d’exhaure creusées à partir des pieds de versant dans la vallée de la Meuse contribuaient également à dénoyer le gisement. La fermeture des dernières exploitations minières durant les années 70 et 80 a été le plus souvent assortie d’un arrêt des opérations de pompage qui y sont associées. Ceci a induit une remontée significative des eaux souterraines avec des conséquences indésirables possibles. Les modèles hydrogéologiques peuvent grandement aider à simuler les écoulements des eaux souterraines dans le contexte particulier des travaux miniers. Cependant, les techniques de modélisation classiques ne sont pas adaptées à ce contexte car le milieu est fortement perturbé par les anciens travaux et les réseaux de galeries. Par conséquent, des techniques de modélisation spécifiques ont été développées. Il s'agit d'une combinaison de modèles de boîte (ne nécessitant que quelques paramètres) pour calculer les niveaux d'eau moyens dans les zones exploitées, avec une modélisation physiquement basée et spatialement distribuée représentant explicitement les zones inexploitées et prenant en compte les interactions entre ces deux sous-domaines. Grâce à ce couplage, les échanges d'eau entre les zones exploitées et inexploitées sont explicitement pris en compte. La méthode permet de simuler la remontée des eaux souterraines après la fermeture des mines et des phénomènes associés tels que les 'coups d'eau' produits par les galeries drainantes. Les concepts et équations de la méthode sont présentés et illustrés sur des cas synthétiques, puis sur l'application de la zone de Cheratte-Blégny. [less ▲]

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See detailImpact des changements climatiques sur la principale réserve en eau souterraine alimentant la ville de Liège (Belgique)
Goderniaux, Pascal; Orban, Philippe ULg; Compère, Jean-Michel et al

in Des villes et des territoires sobres et sûrs, Synthèse des interventions (2015, June 02)

Le changement climatique amène de nouvelles 'pressions' sur les ressources en eaux de surface et souterraines dans de nombreuses zones du monde. Des travaux scientifiques sont nécessaires pour aider les ... [more ▼]

Le changement climatique amène de nouvelles 'pressions' sur les ressources en eaux de surface et souterraines dans de nombreuses zones du monde. Des travaux scientifiques sont nécessaires pour aider les gestionnaires de l'eau à planifier les changements futurs. Un générateur de climats transitoire sophistiqué est utilisé en combinaison avec une modélisation intégrée hydrologique (HydroGeoSphere) pour évaluer les impacts sur les ressources en eaux souterraines de façon probabiliste. Cette nouvelle méthodologie est appliquée pour l'aquifère crayeux de Hesbaye (bassin Geer en Belgique) qui est le principal réservoir d'eau souterraine pour l'alimentation de la ville de Liège. Les sources d'incertitude étudiées sont les suivantes: (1) l'incertitude liée à la calibration du modèle hydrologique, en utilisant 'UCODE_2005'; (2) l'incertitude liée aux modèles climatiques mondiaux et régionaux (GCM et RCM); (3) l'incertitude liée à la variabilité naturelle du climat, en utilisant des scénarios stochastiques de changement climatique locaux. 100 changements climatiques équiprobables scénarios ont été générés sur 2010-2085 pour chacun des six RMC différents. Les résultats montrent que bien que les intervalles de confiance à 95% calculés autour des niveaux piézométriques calculés restent importants, l'effet du changement climatique devient clair et plus prononcé que la variabilité naturelle du climat d'ici 2085. Cette méthodologie constitue une réelle amélioration dans le domaine des prévisions de l'évolution des réserves en eau souterraine dans des conditions de changement climatique car il permet aux gestionnaires d'analyser les risques et prendre des décisions en toute connaissance du degré de confiance des résultats. [less ▲]

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See detailRegression-based modelling of a fleet of gas turbine engines for performance trending
Borguet, Sébastien ULg; Léonard, Olivier ULg; Dewallef, Pierre ULg

in Proceedings of ASME Turbo Expo 2015 (2015, June)

Module performance analysis is a well-established framework to assess changes in the health condition of the components of the engine gas-path. The primary material of the technique is the so-called ... [more ▼]

Module performance analysis is a well-established framework to assess changes in the health condition of the components of the engine gas-path. The primary material of the technique is the so-called vector of residuals, which are built as the difference between actual measurement taken in the gas-path and values predicted by means of an engine model. Obviously, the quality of the assessment of the engine condition depends strongly on the accuracy of the engine model. The present paper proposes a new approach for data-driven modelling of a fleet of engines of a given type. Such black-box models can be designed by operators such as airlines and thirdparty companies. The fleet-wide modelling process is formulated as a regression problem that provides a dedicated model for each engine in the fleet, while recognising that all engines are of the same type. The methodology is applied to a virtual fleet of engines generated within the ProDiMES environment. The set of models is assessed quantitatively through the coefficient of determination and is further used to perform anomaly detection. [less ▲]

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See detailNonlinear ground vibration identification of an F-16 aircraft - Part 2: Parameter estimation using a frequency-domain subspace method
Dossogne, Tilàn ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics (2015, June)

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic ... [more ▼]

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic nonlinearity, is the modelling of the wing-to-payload mounting interfaces. For large amplitudes of vibration, friction and gaps may be triggered in these connections and markedly impact the dynamic behaviour of the complete structure. In this series of two papers, the nonlinear dynamics of an F-16 aircraft is investigated using rigorous methods applied to real data collected during a ground vibration test campaign. The present work focuses on the construction of an experimental mathematical model of the F-16 structural dynamics. A nonlinear generalisation in the frequency domain of the so-called subspace identification algorithms, termed FNSI method, is exploited to this end. The frequency response functions of the underlying linear aircraft and the coefficients of the nonlinearities are reliably estimated by this approach based on periodic random data. The use of stabilisation diagram in nonlinear system identification is also discussed. The application of the FNSI method is made challenging by the high modal density of the structure, and the complexity of the nonlinear stiffness and damping mechanisms involved within the wing-to-payload connections. [less ▲]

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See detailNumerical study of intrinsic features of isolas in a 2-dof nonlinear system
Detroux, Thibaut ULg; Noël, Jean-Philippe ULg; Masset, Luc ULg et al

in Proceedings of the ICEDyn conference (2015, June)

In the present paper, isolated response curves in a nonlinear system consisting of two masses sliding on a horizontal guide are examined. Transverse springs are attached to one mass to provide the ... [more ▼]

In the present paper, isolated response curves in a nonlinear system consisting of two masses sliding on a horizontal guide are examined. Transverse springs are attached to one mass to provide the nonlinear restoring force, and a harmonic motion of the complete system is imposed by prescribing the displacement of their supports. Numerical simulations are carried out to study the conditions of existence of isolated solutions, their bifurcations, their merging with the main response branch and their basins of attraction. This is achieved using tools including nonlinear normal modes, energy balance, harmonic balance-based continuation and bifurcation tracking, and global analysis. [less ▲]

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See detailSpeckle interferometry in the long-wave infrared for combining holography and thermography in a single sensor. Applications to nondestructive testing: the FANTOM project
Georges, Marc ULg

in Lehmann, Peter; Osten, Wolfgang; Albertazzi, Armando (Eds.) Optical Measurement Systems for Industrial Inspection IX (2015, June)

Speckle interferometry in the thermal wavelengths range (long-wave infrared, 8-14 μm), combining a CO2 laser and recording with an uncooled microbolometer camera is presented. In this wavelength range ... [more ▼]

Speckle interferometry in the thermal wavelengths range (long-wave infrared, 8-14 μm), combining a CO2 laser and recording with an uncooled microbolometer camera is presented. In this wavelength range specklegrams are affected by the thermal radiation emitted by objects at room temperature. This allows simultaneously capturing temperature and surface shape information about objects. The FANTOM project is based on this concept and an instrument was developed to take advantage of this natural data fusion. It has been used in a variety of nondestructive testing applications where both information are useful, specifically in aeronautical composite structures. [less ▲]

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See detailDe novo sequencing using MELD proteolysis coupled to a "sequence assembly" algorithm
Mazzucchelli, Gabriel ULg; Zimmerman, Tyler; Smargiasso, Nicolas ULg et al

in 63rd ASMS Conference Proceedings, May 30 - June 4 2015, St. Louis, MO (2015, June)

Introduction Protein de novo sequencing requires a method that combines extensive MSMS fragmentation and an appropriate data processing. This can be applied either on intact protein or on its proteolytic ... [more ▼]

Introduction Protein de novo sequencing requires a method that combines extensive MSMS fragmentation and an appropriate data processing. This can be applied either on intact protein or on its proteolytic peptides. Peptide analysis has the advantage to be compatible with well-known workflows. Nevertheless the connectivity between peptides is lost. Taking these considerations into account, a specific digestion method and a sequence assembly software were developed. The MELD method relies on a combination of MultiEnzymatic AND Limited proteolytic Digestions. The MELD generates in a single experiment numerous different peptides with miss-cleavages that overlap when aligned on the matching protein sequence. The two major benefices are an increased probability to obtain the entire protein sequence and a redundancy in the protein sequence matches. Methods The MELD consists in two parallel 2h digestions both using an optimized protease mixture. The mixtures are composed of the same proteases but in different relative quantities. Analyses were performed by UPLC-Orbitrap (IClass, Waters, QExactive, Thermo). Data were processed with PEAKS (BSI) to generate de novo sequence candidates. After data importation into our software, a seed sequence is set or can be found automatically. The software extends the seed sequence in both directions with moving windows of three amino acids, plus a fourth one to be added. The added amino acid is validated in several ways, including by the total frequency of occurrence, by larger windows of aa, by the local spectrum-derived confidence, and by combinations of these factors. Preliminary Data The MELD protocol was first validated by applying a traditional database search workflow on several commercial proteins with an inter-day and inter-individual procedure. These experiments showed 100% sequence coverage for each protein analyzed, involving information on peptide identity and modifications localization. Strong confident identification was obtained due to multiple overlapping peptides matches with the given sequence and with a high number of overlapping peptides assignments. The analysis of the four proteins provided the following results: HSA, Myoglobin and Lysozyme were identified with 100% sequence coverage with respectively 890, 300 and 120 unique peptides (CV<10%, peptide FDR<0.1%). The variable region of each heavy and light chains of Adalimumab antibody were identified with 100% sequence coverage. With the MELD, an average of 10 different peptides covering each sequence stretch of the protein could be obtained. The combinatory effect of the multiple enzymes used and the limited digestions leads to an increased robustness, very high confidence identifications and allows clear localization of PTMs. The MELD protocol as presented here and tested on several pure proteins digested in solution, certainly improves the general "bottom-up" strategy applied for highly confident protein identification and would allow better protein characterization, even for those having PTMs. In addition, in our analysis, each fragment position of the entire protein sequence was evidenced either by a "y" or a "b" fragment ion. This high and confident amount of information enables extensive de novo sequencing using PEAKS software, followed by application of our “sequence assembly” algorithm. The first version of our assembling tool on MELD experimental data generated long sequence tags, up to 90 amino acids long. [less ▲]

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See detailNo interest for a second closely-timed infiltration of platelet-rich plasma (PRP) to treat jumper’s knees
Kaux, Jean-François ULg; CROISIER, Jean-Louis ULg; Forthomme, Bénédicte ULg et al

in Radmann, A; Hedenborg, S; Tsolakidis, E (Eds.) 20th annual Congress of the EUROPEAN COLLEGE OF SPORT SCIENCE - BOOK OF ABSTRACTS (2015, June)

Introduction: Some clinical series have evaluated the effect of platelet-rich plasma (PRP) in the treatment of jumper’s knee. Although it is possible that a single infiltrative administration may prove to ... [more ▼]

Introduction: Some clinical series have evaluated the effect of platelet-rich plasma (PRP) in the treatment of jumper’s knee. Although it is possible that a single infiltrative administration may prove to be an effective treatment for this indication, most of the existing studies evaluated the effects of 2 or 3 successive infiltrations. The aim of this study was to evaluate whether 2 infiltrations of PRP proves moreeffective than a single treatment. Methods: Twenty patients suffering from chronic jumper’s knee were enrolled into our prospective, randomized and comparative study of level 2, and split into two randomized groups (1 or 2 infiltrations of PRP, respectively). The 3-month follow-up evaluation consisted of VAS, IKDC and VISA-P scores, along with algometer, isokinetic and ultrasounds evaluations. After 1 year, subjects were contacted to define their functional evolution. Results: The concentration of the PRP used for each infiltration was similar in both groups, and contained no red or white cells. Results revealed no difference in treatment efficacy between the groups.Discussion: The comparison between 1 or 2 infiltrations of PRP did not reveal any difference between the 2 groups at short to mid term. A second closely-timed infiltration of PRP to treat jumper’s knees is not necessary to improve the efficacy of this treatment in the short term. References: Kaux JF, Croisier JL, Bruyere O, Rodriguez de la Cruz C, Forthomme B, Brabant G et al. One injection of platelet-rich plasma associated to a submaximal eccentric protocol to treat chronic jumper’s knee. J Sports Med Phys Fitness. 2014 Jun 19. [Epub ahead of print]. Kaux JF, Croisier JL, Forthomme B, Le Goff C, Buhler F, Savanier C et al. Using platelet-rich plasma to treat jumper’s knees: exploring the effect of a second closely-timed infiltration. J Sci Med Sport. Submitted. Kaux JF, Bruyère O, Croisier JL, Forthomme N, Le Goff C, Rohr N et al. One-year follow-up of platelet-rich plasma infiltration to treat chronic upper patellar tendinopathies. Acta Orthop Belg. In press. [less ▲]

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See detailA novel mutation of the luteinizing hormone/choionic gonadotrophin receptor gene leading to Leydig cell hypoplasia type I
Potorac, Iulia ULg; Rivero-Muller, A; Pintiaux, Axelle ULg et al

in The International Journal of The Romania Society of Endocrinology - Abstract book (2015, June)

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See detailExtension patterns in pituitary macroadenomas and relation to T2-weighted signal on diagnostic MRI examinations
Potorac, Iulia ULg; Cattin, F; KREUTZ, Julie ULg et al

in The International Journal of The Romania Society of Endocrinology - Abstract book (2015, June)

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See detailLes leviers de l'inovation pédagogique: contraintes externes vs régulations internes
Scheffers, Patricia ULg

in Scheffers, Patricia (Ed.) Actes du colloque (2015, June)

Depuis les années 60, la fréquence de mutations organisationnelles de l'enseignement supérieur et universitaire en Belgique s'amplifie et adopte même un rythme frénétique ces dix dernières années. Les ... [more ▼]

Depuis les années 60, la fréquence de mutations organisationnelles de l'enseignement supérieur et universitaire en Belgique s'amplifie et adopte même un rythme frénétique ces dix dernières années. Les causes sont tour à tour l'évolution des professions et la volonté politique et/ou économique de restructuration. Deux niveaux de régulations pédagogiques sont amenés à s'articuler. D'une part, celui de l'enseignant acteur-réflexif de son enseignement et d'autre part, des injonctions externes qui réorganise le cadre général. Retour d'expérience sur les innovations en Faculté d'Architecture à Liège. [less ▲]

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See detailDynamic modeling of thermal systems using a semi-empirical approach and the ThermoCycle Modelica Library
Altés Buch, Queralt ULg; Dickes, Rémi ULg; Desideri, Adriano ULg et al

in Proceedings of the 28th International Conference on Efficiency, Costs, Optimization and Simulation of Energy Systems (2015, June)

This paper proposes an innovative approach for the dynamic modeling of heat exchangers without phase transitions. The proposed thermo-flow model is an alternative to the traditional 1D finite-volumes ... [more ▼]

This paper proposes an innovative approach for the dynamic modeling of heat exchangers without phase transitions. The proposed thermo-flow model is an alternative to the traditional 1D finite-volumes approach and relies on a lumped thermal mass approach to model transient responses. The heat transfer is modeled by the well-known Logarithmic Mean Temperature Difference approach, which is modified to ensure robustness during all possible transient conditions. The lumped parameter models are validated with references models and tested within a Concentrating Solar Power plant model. Results indicate that the developed lumped models are robust and computationally efficient, ensuring the convergence of the Newton Solver. They are significantly faster (~10-fold) than the traditional finite volume models, although a more extensive comparisons would be needed to confirm this figure. They are well suited to be integrated in larger system models, but are not appropriate for the simulation of detailed thermo-flow phenomena. [less ▲]

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See detailL'enseignement du latin à Constantinople : une mise au point
Rochette, Bruno ULg

in Haverling, Gerd V.M. (Ed.) Latin Linguistics in the Early 21st Century. Acts of the 16th International Colloquium on Latin Linguistics, Uppsala, June 6th-11th, 2011 (2015, June)

Nous savons que Constantinople a possédé une chaire stable de latin vers 360. Plusieurs grammairiens latins qui ont travaillé à Constantinople ou dans d’autres villes du monde grec ont mis au point des ... [more ▼]

Nous savons que Constantinople a possédé une chaire stable de latin vers 360. Plusieurs grammairiens latins qui ont travaillé à Constantinople ou dans d’autres villes du monde grec ont mis au point des artes destinées à un public hellénophone. Les analogies entre le grec et le latin dans la grammaire et le lexique n’ont pas échappé à l’attention à ces grammairiens. Aboutissement d’une tradition qui remonte à Claudius Didymus, Macrobe donne une σύγκρισις du système verbal grec et latin dans son traité De uerborum Graeci et Latini differentiis uel societatibus. Il offre un exemple unique pour l’antiquité de linguistique comparative, mais son but n’est pas pédagogique. Il décrit, mais n’explique pas les ressemblances et les différences entre le système verbal grec et latin. C’est toutefois la même méthode qui est mise en œuvre dans l’enseignement du latin comme L², à savoir l’approche comparative. Le latin s’enseigne aux hellénophone par analogie ou en contraste avec le grec. [less ▲]

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