References of "Scientific congresses and symposiums"
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See detailMot de cloture
Mescoli, Elsa ULg; Sarcinelli, Alice ULg

Conference (2016, May)

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See detailIdentification des besoins des mères dans l’année suivant leur accouchement : une étude qualitative.
Slomian, Justine ULg; EMONTS, Patrick ULg; Vigneron, Lara et al

in 44èmes Assises Nationales des Sages-Femmes (2016, May)

Contexte de l’étude : La grossesse et l’accouchement sont deux étapes fondamentales dans la vie d’une femme. Plusieurs études ont montré que le malaise psychologique était relativement fréquent dans ... [more ▼]

Contexte de l’étude : La grossesse et l’accouchement sont deux étapes fondamentales dans la vie d’une femme. Plusieurs études ont montré que le malaise psychologique était relativement fréquent dans l’année suivant un accouchement. Objectifs : L’objectif de cette étude était de déterminé les besoins des mères dans l’année suivant leur accouchement (qu’elles aient vécu un épisode psychologique pathologique ou non). Méthode : Plusieurs étapes qualitatives ont été entreprises dans cette étude. Premièrement, nous avons conduit 22 entretiens individuels et un focus group réunissant des mères ayant vécu ou non un épisode de détresse psychologique. Nous avons ensuite mené deux autres focus : un avec des professionnels de la santé, l’autre avec des pères. Le but était de comparer les besoins maternels avec la perception des professionnels ainsi que des pères. Règles éthiques : Cette étude a reçu l’accord du comité d’éthique hospitalo-facultaire du CHU de Liège sous le numéro : 2015/48. Chaque participante a signé un formulaire de consentement éclairé quant à sa participation à l’étude ainsi qu’à l’autorisation de diffuser les résultats de façon confidentielle. Résultats : Les besoins des mères après leur accouchement ont été classés en 4 grandes catégories : le besoin d’information, le besoin de soutien psychologique, le besoin de partage d’expériences et le besoin de support matériel et pratique. Les femmes ne se sentent pas assez informées dans cette période de vie difficile. Elles ne se sentent pas non plus assez soutenues au point de vue psychologique mais également dans les tâches ménagères. Elles sont souvent fatiguées et se posent beaucoup de questions. Elles ont besoin de partager cette expérience de vie et elles ont besoin d’être rassurées et de se sentir comprises. Il semblerait qu’il y ait des différences de vécu d’expériences entre les mères et les professionnels mais également entre les mères et les pères. Conclusion : L’arrivée d’un bébé est une étape importante dans la vie d’une femme et d’un couple. Cela demande un remaniement tant sur les plans physique que psychologique et social. Les mères semblent ressentir un manque de support à différents niveaux au cours de la période postnatale. Cette étude procure des pistes pour répondre à leurs besoins et tenter de prévenir le risque de détresse psychologique dans la période postnatale. [less ▲]

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See detailFrom Metabolomics to Identification of a new therapeutic approach for Age-Related Macular Degeneration (AMD)
Schoumacher, Matthieu ULg; De Tullio, Pascal ULg; LAMBERT, Vincent ULg et al

Poster (2016, May)

Age-related macular degeneration (AMD) is the leading cause of vision loss in the western world among people aged 50 or older. 90% of all vision loss due to AMD result from the exudative form, which is ... [more ▼]

Age-related macular degeneration (AMD) is the leading cause of vision loss in the western world among people aged 50 or older. 90% of all vision loss due to AMD result from the exudative form, which is characterized by choroidal neovascularization (CNV). Age-related changes that induce pathologic CNV are incompletely understood and critical issues remain to be addressed. Metabolomics is defined as the comprehensive study of endogenous metabolites changes in various biological systems. This newly emerging “omic” science provides a unique opportunity to correlate variation of the metabolome with pathological occurrence or progression and/or to identify metabolites that are implicated in the disease. We apply a 1H NMR metabolomics approach on sera collected from AMD patient and healthy volunteers and form a mice model of laser-induced CNV which mimics the effect of exudative AMD. After post-processing treatments, the different spectra were analyzed by statistical discriminant methodologies (PCA, ICA, PLS-DA, O-PLS-DA). These approaches allow the differentiation between control and AMD patients and between laser-induced mice and the control mice group. Moreover, the same discriminating spectral zones have been identified in human and mice model, leading to the emergence of different putative biomarkers. Among these markers, lactate emerges as a key metabolite in both settings. Mechanistically, lactate produced locally and by inflammatory cells, plays a critical role in the onset of the inflammatory and angiogenic phases. In mice model of laser-induced CNV, normalization of circulating lactate by dichloroacetate a pyruvate dehydrogenase kinase (PDK) inhibitor, decreases CNV development. Our data support the innovative concept of lactate as a parainflammation- and angio-metabolite associated to AMD and CNV progression. Moreover, control of blood lactate level via inhibition of PDK provides new options for the treatment of exudative AMD. This study demonstrates the ability of metabolomics for drug target discovery and opens new perspectives for AMD treatment and patient follow-up. [less ▲]

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See detailModelling and Emulation of an Unbalanced LV Feeder with Photovoltaic Inverters
López-Erauskin, Ramón; Gyselinck, Johan; Olivier, Frédéric ULg et al

in Proc. of 8th IEEE Benelux Young researchers symposium in Electrical Power Engineering (2016, May)

In this paper, the penetration of grid-connected pho- tovoltaic systems is studied, experimentally tested and compared to simulation results. In particular, how the inverse current flow and unbalance ... [more ▼]

In this paper, the penetration of grid-connected pho- tovoltaic systems is studied, experimentally tested and compared to simulation results. In particular, how the inverse current flow and unbalance situations affect the voltage in the low-voltage grid. Thus, a test platform has been developed for obtaining experimental results with grid-tied commercial inverters. Photo- voltaic arrays are emulated and subjected to different irradiance profiles and the inverters are controlled to produce at different power conditions. A model has been developed in order to repro- duce the same operating conditions and working environment. Simulations are performed with the software PowerFactory and the results compared to the experimental ones. [less ▲]

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See detailDerivation of cochlear cells from pathological or isogenic human iPSCs for modeling hereditary hearing loss
Czajkowski, Amandine ULg; Grobarczyk, Benjamin; Hanon, Kevin ULg et al

Poster (2016, May)

Alström Syndrome (AS) is a human autosomal recessive genetic disorder characterized by numerous clinical symptoms including deafness. AS is caused by mutations in the ALMS1 gene encoding for ALMS1 protein ... [more ▼]

Alström Syndrome (AS) is a human autosomal recessive genetic disorder characterized by numerous clinical symptoms including deafness. AS is caused by mutations in the ALMS1 gene encoding for ALMS1 protein expressed at the basal body and implicated in ciliogenesis, cell cycle and proliferation (Jagger et al., 2011; Zulato et al., 2011 & Shenje et al., 2014). We are interesting in understanding the unknown mechanisms involving this protein in the genetic deafness of AS patients. To develop a model as closer as possible to the human pathology, we are using human induced pluripotent stem cells (hiPSCs) generated from fibroblasts of healthy and AS patients. Using a stepwise protocol, we demonstrated that healthy hiPSCs (waiting for isogenic hiPSCs) can generate a population of cells with gene and protein expression patterns consistent with the ones of otic progenitor cells (OSCs). At this differentiation stage, we observed some proliferation and apoptotic defects between healthy and AS cells. When human OSCs are co-cultured with mouse feeder cells, they are able to differentiate into hair cells (HCs). We successfully differentiated AS hiPSCs generated from AS patients into HCs. We are currently confirming gene expression pattern and testing HCs functionality.  To exclude patient linked epigenetics and differentiation defects, we are correcting the genomic mutation in the AS hiPSCs to generate isogenic hiPSCs using the CRIPSR/Cas9 system. Thanks to the isogenic hiPSCs we will be able to confirm that these defects are well due to the ALMS1 mutation. [less ▲]

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See detailL’accompagnement des demandeurs d’emploi par les intermédiaires du marché du travail : une triple opération de sélection
Gérard, Julie ULg; Beuker, Laura ULg

Conference (2016, May)

En 1997, la Convention 181 de l’Organisation internationale du travail sonne le glas du monopole public en matière de placement. Elle invite les services publics de l’emploi et les opérateurs privés à ... [more ▼]

En 1997, la Convention 181 de l’Organisation internationale du travail sonne le glas du monopole public en matière de placement. Elle invite les services publics de l’emploi et les opérateurs privés à collaborer pour fournir un accompagnement plus efficace aux demandeurs d’emploi. Cette collaboration s’inscrit dans le cadre d’une entente contractuelle où les services de l’emploi confient l’exploitation et la gestion de certaines de leurs activités à des prestataires privés au sein de partenariats publicsprivés. Qu’il s’agisse des services publics de l’emploi ou des prestataires privés, tous deux ont pour mission d’assurer l’insertion socioprofessionnelle des demandeurs d’emploi en tant que généralistes, ou spécialistes de l’employabilité. Elle s’inscrit dans la stratégie d’EU2020 et contribue à l’atteinte d’un taux d’emploi de 73,2% pour 2020. À l’aide de trois études de cas réalisées auprès du service public wallon et de deux prestataires privés exerçant en Région wallonne, nous démontrerons que cette mission d’accompagnement s’exerce au prix d’une triple sélection : une première réalisée par le politique, via la définition de publics cibles prioritaires ; une seconde opérée par les agents du service public dans leurs pratiques professionnelles d’accompagnement ; une troisième effectuée par les prestataires privés en fonction de critères objectifs et/ou subjectifs. Pour étudier la mise en oeuvre et l’effet de ces opérations de tri, nous nous inscrirons dans une approche pragmatique. Appuyé sur une étude empirique constituée d’entretiens semi-directifs (N = 45), d’observations d’interactions (N = 149) et de discussions informelles, nous montrerons les conséquences globales de ces tris pour les demandeurs d’emploi. En ne sélectionnant que les plus employables des inemployables, l’opération d’accompagnement ne serait-elle finalement qu’une agitation, et non pas une véritable mise à l’emploi ? [less ▲]

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See detailReal-time capture of the folding-unfolding transitions in a single oligorotaxane foldamer
Sluysmans, Damien ULg; Stoddart, J. Fraser; Duwez, Anne-Sophie ULg

Conference (2016, May)

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See detailBinary Phase Behavior of tripalmitoylglycerol and 1,3-dipalmitoyl-2-stearoyl-sn-glycerol
Bhaggan, K.; Smith, K. W.; Blecker, Christophe ULg et al

Poster (2016, May)

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See detailMicroparticules à base d’amidon radiomarquées au 188Re et 68Ga comme agent théranostique pour la radiothérapie interne sélective du carcinome hépatocellulaire
Verger, Elise ULg; Drion, Pierre ULg; MEFFRE, Geneviève ULg et al

in 2es Journées Francophones de Médecine Nucléaire (2016, May), 40(3), 182

Les microparticules SBMP, en étant capable d'être radiomarquées rapidement, de manière reproductible, sous forme de kits prêt-à-l‘emploi, par du 188Re et du 68Ga, se révèlent être un outil théranostique ... [more ▼]

Les microparticules SBMP, en étant capable d'être radiomarquées rapidement, de manière reproductible, sous forme de kits prêt-à-l‘emploi, par du 188Re et du 68Ga, se révèlent être un outil théranostique prometteur pour le traitement du carcinome hépatocellulaire. [less ▲]

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See detailInflammation et alimentation: des pistes intéressantes
Knapp, Emilie ULg; Guyot, Hugues ULg

in SNGTV (Ed.) Journées Nationales des GTV: Nutrition et pratique vétérinaire, du b.a.-ba à l'innonvation (2016, May)

Les processus inflammatoires sont déclenchés lors d'une agression et font partie intégrante du système immunitaire. La problématique réside lorsque ces processus inflammatoires ne sont plus contrôlés et ... [more ▼]

Les processus inflammatoires sont déclenchés lors d'une agression et font partie intégrante du système immunitaire. La problématique réside lorsque ces processus inflammatoires ne sont plus contrôlés et provoquent plus de lésions que l'agression elle-même. Cette inadéquation des réactions inflammatoires aggravent souvent des pathologies comme les mammites, les métrites ou les pathologies métaboliques. La quantité et la qualité de l'alimentation, ainsi que le statut métabolique sont des points majeurs de régulation du système inflammatoire. En effet, de nombreuses molécules intervenant dans l'inflammation sont des protéines synthétisées par le foie ou sont dérivés des acides gras alimentaires. En début de lactation, la mobilisation graisseuse et les corps cétoniques ont une action directe sur l'activité inflammatoire ce qui expliquent l'état de stress oxydatif, la chute d'immunité ainsi que l'état pro-inflammatoire des vaches en post-partum. La digestion ruminale et intestinale des hydrates de carbone et des protéines peuvent également provoquer et réguler l'état inflammatoire systémique du ruminant. L'acidose chronique en est un exemple, cependant, l'alcalose et la mal-digestion des fibres peuvent également provoquer de l'inflammation. En pratique, il existe des paramètres qui permettent d'évaluer l'inflammation d'un animal et d'un troupeau. A l'aide d'une prise de sang et de dosage des protéines totales plasmatiques et sériques on pourra facilement et à des coûts limités, mesurer la présence d'inflammation aiguë ou chronique. La présence d'inflammation chronique est un facteur de risque sous-jacent important dans nos troupeaux de vaches laitières puisqu'il concerne environ 25% des troupeaux qui ont présenté des problèmes de défaut d’efficience alimentaire. Dans les troupeaux avec des signes cliniques de type amaigrissement, sous-production, mal-digestion des fibres et inflammation chronique, l'acidose chronique n'a été diagnostiquée que sur 5% des vaches alors que l'inactivité ruminale a été montrée sur 40% des animaux. Cette inactivité est souvent liée à un déficit en matière organique fermentescible couplée avec un excès de protéines fermentescible ce qui entraine des pH élevés et diminue la multiplication de la flore du rumen. L'analyse du jus de rumen, couplée avec celle des protéines totales permet dans la plupart des cas de poser un diagnostic et de discriminer les cas de SARA des cas de maldigestion et adapter correctement la ration. [less ▲]

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See detailAnalyse des effets des exigences d’accountability sur l’organisation du travail des intermédiaires de l’emploi : mise en perspective de tensions identitaires
Beuker, Laura ULg; Gérard, Julie ULg

Conference (2016, May)

Suite aux nombreux bouleversements économiques et sociaux qui ont touché les pays de l’Union européenne fin des années 1980, d’impérieux besoins de lisibilité et de modernisation des services publics de ... [more ▼]

Suite aux nombreux bouleversements économiques et sociaux qui ont touché les pays de l’Union européenne fin des années 1980, d’impérieux besoins de lisibilité et de modernisation des services publics de l’emploi sont apparus. Ceux-ci doivent dorénavant veiller à la mise en œuvre d’exigences a priori incompatibles telles qu’être efficaces, flexibles et respecter une enveloppe budgétaire, tout en œuvrant à l’inclusion sociale. La mise en œuvre de ces exigences s’inscrit dans la lignée du nouveau management public qui introduit les valeurs et les modes de fonctionnement de la firme privée au sein d’administrations publiques à caractère bureaucratique (Pesqueux, 2006 ; Bezes, 2012). Parmi les services publics de l’emploi belges, cette transformation de l’action publique s’apparente à une décentralisation partielle de leurs ressources et de leurs responsabilités auprès de partenaires privés. Ce nouveau mode d’organisation du travail prend la forme de partenariats publics-privés dont la visée est d’assurer conjointement la réinsertion socioprofessionnelle des demandeurs d’emploi (Aubert et Patry, 2004). Dans leurs activités, tant les services publics de l’emploi que les prestataires privés sont amenés à devoir rendre des comptes sur la réalisation de leurs pratiques. Cette exigence d’accountability comporte un double but : (1) être transparent ; (2) légitimer l’utilisation de l’argent public. Prenant appui sur les apports de la sociologie des groupes professionnels, nous analyserons l’influence des exigences d’accountability sur l’organisation du travail des intermédiaires. Pour ce faire, nous avons réalisé une recherche empirique de nature qualitative (N = 317 observations ; N = 40 entretiens semi-directifs) en Fédération Wallonie-Bruxelles auprès de deux prestataires de l’emploi : un public et un privé. Nous montrerons que le travail relationnel d’accompagnement réalisé par ces deux acteurs est résumé par des chiffres et de la saisie de données, rendant de la sorte invisible leur coeur de métier. Initialement engagés pour réaliser une mission foncièrement relationnelle (à savoir l’accompagnement des demandeurs d’emploi), ils sont désormais contraints par des procédures et mus par une logique d’efficacité. Ce hiatus, entre l’aspect relationnel de la fonction et les exigences d’efficacité concomitantes, se cristallise dans deux tensions identitaires, dont nous rendrons compte. [less ▲]

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See detailMixed Component Oleogels Prepared Using Synergistic Combinations of Monoglyceride and Phytosterols
Sintang, Mohd Dona Bin; Rimaux, Tom; Danthine, Sabine ULg et al

Conference (2016, May)

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See detailStructuration of Robinia pseudoacacia L. genetic diversity in the American natural range and derived Belgian populations
Verdu, Cindy; Daïnou, Kasso; De Thier, Olivier et al

Poster (2016, May)

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See detailAre crop models able to efficiently simulate crop growth under shade?
Artru, Sidonie ULg; Dumont, Benjamin ULg; Lassois, Ludivine ULg et al

in Gosme, Marie (Ed.) 3rd European Agroforestry conference 2016 - Book of abstracts (2016, May)

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See detailPRODUCTION OF BIOFUELS AND BIOBASED COMPOUNDS IN URBAN BIOREFINERIES: A STRATEGY TO MANAGE WASTE IN WALLONIA?
Richel, Aurore ULg; Haubruge, Eric ULg; Jacquet, Nicolas ULg

Conference (2016, May)

“Urban biorefining” is an original concept aiming at using urban wastes (household wastes, municipal wastes, industrial liquid and/or solid residues and side-products, etc.), mainly of vegetal origin, for ... [more ▼]

“Urban biorefining” is an original concept aiming at using urban wastes (household wastes, municipal wastes, industrial liquid and/or solid residues and side-products, etc.), mainly of vegetal origin, for the production of an array of biofuels and bioproducts. This “urban biorefining” concept fits particularly with the economic, geographic and politic contexts and constraints of the Walloon Region (south part of Belgium). Indeed, Walloon Region is a very small territory (area of about 6,504 sq mi) with a temperate climate. Supply feedstock, mainly arising form forestry and agriculture, are thus rather restricted, submitted to importation, and subjected to non-standardized quality. Several examples of our regional strategy, still available on an industrial scale, are herein proposed and detailed. [less ▲]

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See detailFrom Metabolomics Study of Age-Related Macular Degeneration (AMD) to the Development of New Pyruvate Dehydrogenase Kinase Inhibitors (PDK)
Arslan, Deniz ULg; Schoumacher, Matthieu ULg; Pirotte, Bernard ULg et al

Poster (2016, May)

Age-related macular degeneration (AMD) is a leading cause of blindness in the elderly population of industrialized countries. This blindness results from the deterioration of the macula, a small part of ... [more ▼]

Age-related macular degeneration (AMD) is a leading cause of blindness in the elderly population of industrialized countries. This blindness results from the deterioration of the macula, a small part of the retina specialized for the high-acuity vision. Exudative AMD, called “wet”, is characterized by the formation of new blood vessels growing under the retina according to a process named choroidal neovascularization (CNV). Currently, the aetiology and pathogenesis of AMD remain unclear. Nevertheless, a recent metabolomics study performed on the serum of “wet” AMD patients and on a CNV murine model, that mimics the effect of “wet” AMD, have demonstrated that lactate level is clearly involved in the severity of the pathology as well as the relationship between lactate, CNV and AMD. According to this result, we suggest a new therapeutic approach of AMD based on the normalization of blood lactate level. The modulation of the lactate plasma concentration by treatment of the animals with synthetic compounds and more specifically Pyruvate Dehydrogenase Kinase (PDK) inhibitors significantly decrease the CNV. PDK and its four isoforms (PDK1-4) regulate the activity of the pyruvate dehydrogenase complex (PDH), a mitochondrial enzyme that plays a major role in the metabolic pathway of glucose, by reversible phosphorylation. Starting from these results, development of new PDK inhibitors could open the way to innovative treatment opportunities in AMD disease. Different analogues of (R)-3,3,3-trifluoro-2-hydroxy-2-methylpropanamide (fig.1) have been already synthetized and pharmacological evaluation is currently in progress. According to the results obtained, various pharmacomodulations will be investigated [less ▲]

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See detailGenetic predisposition to breast cancer occurring in a male-to-female transsexual patient
Potorac, Iulia ULg; CORMAN, Vinciane ULg; Manto, Florence et al

Poster (2016, May)

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See detailDeep Background Subtraction with Scene-Specific Convolutional Neural Networks
Braham, Marc ULg; Van Droogenbroeck, Marc ULg

in International Conference on Systems, Signals and Image Processing, Bratislava 23-25 May 2016 (2016, May)

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction ... [more ▼]

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction algorithm based on spatial features learned with convolutional neural networks (ConvNets). Our algorithm uses a background model reduced to a single background image and a scene-specific training dataset to feed ConvNets that prove able to learn how to subtract the background from an input image patch. Experiments led on 2014 ChangeDetection.net dataset show that our ConvNet based algorithm at least reproduces the performance of state-of-the-art methods, and that it even outperforms them significantly when scene-specific knowledge is considered. [less ▲]

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See detailInteraction entre la zone endommagée autour d’un tunnel et son soutènement – Simulation numérique
Charlier, Robert ULg; Sillen, Xavier; Li, Xiangling et al

Conference (2016, May)

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See detailComparison of 3 Diffractive IOLs in 3 Wavelengths Bifocal/ EDOF/Trifocal.
Gatinel, Damien; Pagnoulle, Christophe; Loicq, Jerôme ULg et al

Conference (2016, May)

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs ... [more ▼]

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs were measured with an optical bench (PMTF,LambdaX,Nivelles, Belgium) to determine modulation transfer function (MTF) and point spread function (PSF). Measurements were performed at 480 nm,546 nm,650 nm using an aberration free cornea and aspheric artificial cornea generating +0.28µm positive spherical aberration by ISO11979-2 guidelines. Through-focus MTF was recorded for various pupil apertures. Evaluation of halos was performed from PSF measurements obtained at each focal spot location. Images of USAF targets were recorded with simulated distances from 1m to 25cm. Amplitude of off-axis peaks of radial profile of PSF enabled to quantify percentage of energy within the halos. Results The monofocal and the bifocal IOLs presented 2 peaks on the through-focus MTF in green light: intermediate vision (at +1.75D) for the monofocal achromatic lens, and far and near vision (at +4D) for the bifocal IOL of the same material. Three peaks (Distance, Intermediate at +1.75D, Near at +3.5D) were recorded with the trifocal IOL at any wavelength. The achromatic monofocal IOL was monofocal for far vision with red light and monofocal for near vision with blue light. The influence of the cornea models was limited. The amount of halos were comparable between lenses (3 to 5 % of the enclosed central light energy). Conclusion The achromatic diffractive IOL behaved like a bifocal IOL with an intermediate addition foci in green light. The bifocal and trifocal IOL induced similar chromatic effects for the near (bifocal, trifocal) and intermediate (trifocal) foci. [less ▲]

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See detailHow Service Managers Can Shape Frontline Employees' Organizational Values to Reduce Person-Role Conflicts
Selzer, Veronika Luisa; Schumann, Jan Hendrik; Büttgen, Marion et al

Conference (2016, May)

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See detailDélinquance et désistance : quelle méthodologie de recherche ?
Puglia, Rosa ULg; Glowacz, Fabienne ULg

Conference (2016, May)

Dans la littérature concernant la délinquance, les auteurs se sont, au départ, principalement intéressés aux raisons qui poussent les individus à commettre des délits mais peu ont tenté de comprendre ... [more ▼]

Dans la littérature concernant la délinquance, les auteurs se sont, au départ, principalement intéressés aux raisons qui poussent les individus à commettre des délits mais peu ont tenté de comprendre pourquoi et comment certains individus, qui ont commis des actes délictueux, sortent de la délinquance. En effet, la désistance, c’est-à-dire le processus de sortie de la délinquance, a longtemps été négligée par les chercheurs. À partir des années '50, un intérêt croissant pour ce domaine de recherche apparaît. La désistance devient alors un sujet d’étude indépendant et non plus un appendice de la recherche sur les carrières délinquantes (Mohammed, 2012). Malgré l’intérêt croissant pour ce champ de recherche, de nombreuses zones d’ombre persistent. Sur base d’une recherche longitudinale réalisée sur une population d’adultes en émergence délinquants (17-25ans), nous tentons d’avoir une approche holistique de la désistance. Celle-ci est définie ici comme un processus impliquant des changements individuels et sociaux, qui s’inscrit dans le temps et qui peut être marqué par des réitérations d’actes délinquants. Dans notre étude, la désistance sera étudiée à travers une approche mixte combinant un récit de vie et des questionnaires. L’approche narrative est essentielle dans notre recherche, elle permettra d’appréhender les transformations identitaires, les schémas de changement et de stabilité dans le parcours de vie et dans la trajectoire délinquante. Elle permettra également de mettre en avant les facteurs internes et externes identifiés comme des facteurs de désistance. Par ailleurs, comme Maruna (2001), nous posons l’hypothèse que les persistants et les désistants sont des individus similaires qui se trouvent à des stades différents du processus de changement. C’est pourquoi, en toile de fond, la désistance sera envisagée à travers le modèle transthéorique de Proshaska et DiClemente (1982) où différentes étapes se succèdent avant l’arrêt du comportement problématique. [less ▲]

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See detailAnalysis of the flexibility of Belgian residential buildings equipped with Heat Pumps and Thermal Energy Storages
Georges, Emeline ULg; Garsoux, Pierre; Masy, Gabrielle et al

in Proceedings of CLIMA2016 Conference (2016, May)

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See detailTowards an Novel Stiff String Model for the Torque and Drag Problem
Huynen, Alexandre ULg

Conference (2016, May)

The petroleum industry relies on several kilometer long drillstrings to transmit the axial force and torque necessary to drill the rock formations and reach deep hydrocarbon reservoirs. The assessment of ... [more ▼]

The petroleum industry relies on several kilometer long drillstrings to transmit the axial force and torque necessary to drill the rock formations and reach deep hydrocarbon reservoirs. The assessment of the energy loss along the drillstring, known as the torque and drag problem, plays an essential role in well planning and drilling as the friction appearing at the contacts between the drillstring and the borehole may dramatically increase the costs or, even, be a limiting factor in some configurations. The identification of the number of contacts as well as their positions and extents constitutes the central concern of this question. The nonlinearities associated with the large deflection of the drillstring and the non-penetration condition as well as the a priori unknown number of contacts, however, make the use of conventional numerical tools rather inefficient. To circumvent these difficulties, a simplified stiff string model is derived. Partitioning the global problem in segments of drillstring either in continuous contact with the borehole or free of contact between their extremities, the originality of the proposed formulation lies in the descripion of the drillstring deflection as perturbation of the well-path. [less ▲]

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See detailDétection de la mémoire ischémique myocardique par le 99mTc-fucoïdane : validation pré-clinique.
Mikail, N; Louedec, L; Aid, R et al

Conference (2016, May)

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See detailQuand les cultures alimentaires se rencontrent. (Re)définition et transmission des pratiques dans un atelier de cuisine arabe en Italie.
Mescoli, Elsa ULg

Conference (2016, May)

Le déplacement des individus est toujours accompagné par le mouvement de choses et pratiques qui voyagent avec eux. Ce fait permet d’étudier la culture matérielle engagée par la mobilité des personnes ... [more ▼]

Le déplacement des individus est toujours accompagné par le mouvement de choses et pratiques qui voyagent avec eux. Ce fait permet d’étudier la culture matérielle engagée par la mobilité des personnes. Cette culture inclut les habitudes alimentaires, qui font l’objet de plusieurs recherches portées sur les changements culinaires (ou les résistances) déterminés par la migration. Loin d’être le seul enjeu constaté lorsque l'on étudie les pratiques alimentaires des migrants – qui par ailleurs sont souvent considérées comme statiques avant la migration –, cette question amène souvent à négliger d'autres dynamiques importantes qui sont également à l’œuvre. Telles que celles qui se produisent lorsque des cultures alimentaires qui se prétendent différentes se rencontrent, ce qui conduit à la mobilisation d’appartenances par les membres de différents groupes culturels qui veulent prendre une position spécifique chacun par rapport à l'autre. Mon exposé vise à analyser cette rencontre. L'hypothèse est qu’elle façonne un espace qui correspond à un tertium quid, une dimension où les frontières des cultures alimentaires peuvent également s’atténuer en raison notamment de la (re)définition et de la transmission des pratiques. Afin de décrire ces dynamiques, je présenterai les données ethnographiques collectées durant un terrain ethnographique porté sur les pratiques culinaires d'un groupe de femmes migrantes marocaines vivant dans la périphérie de Milan, en Italie. Je vais également appuyer ma présentation sur des matériaux visuels recueillis lors des observations et des entretiens dans les maisons ainsi que dans des événements publics tel qu’un cours de cuisine arabe. [less ▲]

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See detailANALYTICAL PREDICTION OF THE BEARING RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
Armenante, Vittorio; D'Antimo, Marina ULg; Demonceau, Jean-François ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research ... [more ▼]

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research is motivated by the fact that the rules currently provided by EC3 for defining the bearing resistance of steel connections are limited to the case of stacks of plates, where every plate composing the connection is always restrained out of plane by the adjoining plate or by the bolt head or nut. This is a condition not verified in case of connections realized with long bolts fastening hollow sections. The work is organized in two sections. First, the results of an experimental campaign are presented and successively, the results of a parametric analysis carried out by means of a Finite Element model calibrated on the experimental data are reported. Afterwards, an analytical approach able to include the local buckling effects arising in these kinds of connections is presented, proposing a coefficient for the reduction of the resistance, to be included in the EC3 formulation. [less ▲]

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

in First International Conference: MINING IN EUROPE, ABTSRACT volume (2016, May)

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See detailNo evidence for genetic differentiation between French and Belgian populations of the exotic tree Robinia pseudoacacia
Bouteiller, Xavier; Aikio, E; Raimbault, A et al

Poster (2016, May)

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See detailAfrique des Grands lacs, à la croisée des chemins.
Kabamba, Bob ULg

Conference (2016, May)

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See detailThat’s embarrassing! Effects of Brand Anthropomorphism on Intimate Disclosure
Gretry, Anaïs ULg; Horváth, Csilla; Belei, Nina

Conference (2016, May)

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See detailCoherent backscattering in the Fock space of Bose- and Fermi-Hubbard systems
Engl, Thomas; Dujardin, Julien; Tisserond, Emilie et al

Poster (2016, May)

Coherent backscattering generally refers to a significant and robust enhancement of the average backscattering probability of a wave within a disordered medium, which from a semiclassical point of view ... [more ▼]

Coherent backscattering generally refers to a significant and robust enhancement of the average backscattering probability of a wave within a disordered medium, which from a semiclassical point of view arises due to the constructive interference between backscattered trajectories and their time-reversed counterparts. We recently investigated the manifestation of this wave interference phenomenon in the Fock space of a disordered Bose-Hubbard system of finite extent [1], which can potentially be realized using ultracold bosonic atoms within optical lattices. Preparing the atoms in a well-defined Fock state of the lattice and letting the system evolve for a finite time will, for suitable parameters of the system and upon some disorder average over random on-site energies of the lattice, generally give rise to an equidistribution of the occupation probability within the energy shell of the Fock space that corresponds to the initial energy of the system, in accordance with the quantum microcanonical ensemble. We find, however, that the initial state is twice as often encountered as other Fock states with comparable total energy, which is a consequence of coherent backscattering [1]. Most recently, we showed that this phenomenon also arises in spin 1/2 Fermi-Hubbard rings that involve Rashba hopping terms (which combine inter-site hoppings with spin flips and arise from spin-orbit coupling), for which a newly developed semiclassical theory [2] correctly predicts a coherent enhancement of the occupation probabilities of the initial state and its spin-flipped counterpart. Moreover, performing a global spin flip within this Fermi-Hubbard system will give rise to significant spin echo peaks on those two Fock states, which is again a consequence of quantum many-body interference [3]. The semiclassical predictions of these enhancements and peaks are found to be in very good agreement with numerical findings obtained from the exact quantum time evolution within this Fermi-Hubbard system. References [1] T. Engl, J. Dujardin, A. Argüelles, P. Schlagheck, K. Richter, and J. D. Urbina, Phys. Rev. Lett. 112, 140403 (2014). [2] T. Engl, P. Plößl, J. D. Urbina, and K. Richter, Theoretical Chemistry Accounts 133, 1563 (2014). [3] T. Engl, J. D. Urbina, and K. Richter, arXiv:1409.5684. [less ▲]

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See detailChitosan-based nanofibers mats for tissue engineering
Aqil, Abdelhafid ULg; Croisier, Florence ULg; Colige, Alain ULg et al

Conference (2016, May)

Polymer hydrogels resemble the natural living tissue due to their high water content and soft consistency. They find many applications in the design and production of contact and intraocular lenses ... [more ▼]

Polymer hydrogels resemble the natural living tissue due to their high water content and soft consistency. They find many applications in the design and production of contact and intraocular lenses, biosensors membranes, matrices for repairing and regenerating a wide diversity of tissues and organs. Polysaccharides such as chitosan and hyaluronic acid based hydrogels have shown a great potential for biomedical and pharmaceutical applications, on account of their remarkable compatibility with physiological medium. Besides, it is degraded in a physiological environment into non-toxic products, which make them outstanding candidates for short- to medium-term applications, especially for tissue engineering. In this respect, the preparation of nanometric fibers mats based on this polysaccharide are highly interesting as such structure mimics the one of skin extracellular matrix. Such nanofibrous materials can be prepared by electrospinning (Figure 1). This technique uses a high voltage to create an electrically charged jet of polymer solution to obtain polymer fibers ranging from nanometers to a few microns in diameter. We thus have investigated strategies allowing to generate chitosan based nanofiber mats exhibiting a mechanical resistance strong enough to be easily handled while keeping the peculiar features of chitosan hydrogels favoring the interaction with cells and soft tissues to provide efficient tissue reconstruction. In a first strategy, polysaccharide-based nanofibers with a multilayered structure were prepared by combining electrospinning (ESP) and layer-by-layer (LBL) deposition techniques. Elastic nanofibers bearing charges at their surface were firstly prepared by electrospinning poly(ε-caprolactone) (PCL) with a polyelectrolyte precursor. After activation by adjusting the pH, the layer-by-layer deposition of chitosan and hyaluronic acid, can be used to coat the electrospun fibers. A multilayered structure is then achieved by alternating the deposition of the positively charged chitosan with the deposition of a negatively charged polyelectrolyte. These novel polysaccharide-coated PCL fiber mats remarkably combine the mechanical resistance typical of the core material (PCL) – particularly in the hydrated state –, with the surface properties of chitosan. Besides, crosslinked nanofibrous mats of chitosan and polyethylene oxide blends, were successfully prepared via electrospinning technique followed by heat mediated chemical crosslinking. This chemical cross-linking allows adjusting the mechanical resistance of the mats while preserving their biocompatibility. In both cases, the control of the nanofiber structure offered by the electrospinning technology, makes the developed processes very promising to precisely design biomaterials for tissue engineering. Preliminary cell culture tests corroborate the potential use of such systems in wound healing applications. [less ▲]

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See detailThe Dark Side of Customer Participation: The Antecedents of Customer Participation Stress
Treger, Stephanie; Büttgen, Marion; Schumann, Jan Hendrik et al

Conference (2016, May)

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See detailJeunes fugueurs en Belgique : Indicateurs de risque et de protection dans les signalements
Courtain, Audrey ULg; Glowacz, Fabienne ULg

Conference (2016, May)

Chaque année, 1% des foyers européens vit la fugue d’un de ses membres de moins de 18 ans. Au 2 janvier 2014, plus de onze mille jeunes français étaient recherchés comme fugueurs ; avec près de 50.000 ... [more ▼]

Chaque année, 1% des foyers européens vit la fugue d’un de ses membres de moins de 18 ans. Au 2 janvier 2014, plus de onze mille jeunes français étaient recherchés comme fugueurs ; avec près de 50.000 fugues de mineurs français par an. En Belgique, sur les années 2013-2014, l’organisme Child Focus s’est vu confier près de 1700 dossiers de fugues de mineurs. Child Focus - Fondation pour Enfants Disparus et Sexuellement Exploités – a été créée à la suite de l’affaire Dutroux, et traite des dossiers de disparitions de mineurs (enlèvements par un tiers, enlèvements parentaux, fugues) et d’exploitation sexuelle de mineurs. Généralement contacté par la famille du jeune ou par la police, Child Focus ne peut ouvrir un dossier de fugue qu’à la suite d’un procès-verbal. Les dossiers de fugues de mineurs ouverts auprès de Child Focus constitueraient un cinquième des fugues enregistrées par la police belge. Ces dossiers, de par leur contenu, permettent d’envisager trois axes de recherche. Le premier axe porte sur le profil des jeunes signalés en fugue (âge, sexe, contexte familial, scolarité,…). Le second axe porte sur le profil du signalant (père, mère, famille élargie, police,…). Le troisième axe porte sur les indicateurs de risque et de protection que les signalants expriment auprès de Child Focus lorsqu’ils évoquent le jeune en fugue (consommation de drogue, délinquance, santé mentale,…). Ces trois axes sont étudiés à partir de deux recherches empiriques, la première portant sur les 1700 dossiers des années 2013-2014, et la seconde portant sur 200 de ces dossiers, dont nous donnerons les résultats préliminaires. Enfin, par ces recherches, nous proposons d’évaluer la portée des filtres et de la black box permettant de comprendre comment et pourquoi certains cas de fugue sont davantage susceptibles d’être confiés à Child Focus que d’autres. [less ▲]

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See detailDealing with crop rotation in agroforestry: the impact of shade on winter wheat and sugar beet growth and yield under belgium conditions
Artru, Sidonie ULg; Garré, Sarah ULg; Hiel, Marie-Pierre ULg et al

in Book of Abstract- 3rd European Agroforestry Conference 2016 (2016, May)

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See detailEnergy Reduction in Public Building Stock: Assessing the Impact of Control Strategy over Expected Energy Savings and Indoor Comfort Level
Ruiz Flores, Roberto ULg; D’Antoni, Matteo; Lemort, Vincent ULg

in CLIMA 2016 - proceedings of the 12th REHVA World Congress: volume 1. Aalborg: Aalborg University, Department of Civil Engineering. (2016, May)

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact ... [more ▼]

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact is a primary energy reduction of about 50% with respect to the existing scenario with a large replication potential under different European countries. In order to achieve such ambitious goal one issue that cannot be ignored is the effect of control strategy, not only over the resulting energy performance but also over the resulting indoor comfort conditions. In this paper, the actual control strategy implemented in the Belgian demo of Bricker project is introduced, compared against an ideal approach and accordingly optimized. The resulting proposed approach is then tested by means of numerical simulations over a base case scenario before renovation. The main conclusion of this work is the demonstration that control strategy of energy generation and distribution systems has to be revised whenever deep renovation of passive or active building technologies is undertaken. Contrarily to which, project renovation goals cannot be met. [less ▲]

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See detailQuelle est la place d’internet pour combler le besoin d’information des nouvelles mères ?
Slomian, Justine ULg; Bruyère, Olivier ULg; Reginster, Jean-Yves ULg et al

Poster (2016, May)

Contexte de l’étude : Les femmes autour de la grossesse et de la naissance expriment un besoin d’information. Internet est devenu l’un des moyens les plus importants de s’informer sur sa santé. De ... [more ▼]

Contexte de l’étude : Les femmes autour de la grossesse et de la naissance expriment un besoin d’information. Internet est devenu l’un des moyens les plus importants de s’informer sur sa santé. De nombreuses innovations dans la santé mobile révolutionnent les soins de santé actuels. Ces outils constituent une aide pour les médecins et permettent également de responsabiliser les patients par rapport à leur santé. Objectifs : Le but de cette étude est d’évaluer, chez des femmes francophones ayant des enfants de 0 à 2 ans, utilisant déjà internet, l’intérêt et le degré d’utilisation d’Internet pour des questions relatives à la période postnatale ; que cela concerne leur propre santé où celle de leur enfant. Méthode : Un sondage en ligne a été créé et diffusé largement via les réseaux sociaux. Toutes les femmes comprenant le français pouvait y répondre peu importe leur pays de résidence. Règles éthiques : L’étude a été approuvée par le comité d’éthique hospitalo-facultaire du CHU de Liège sous le numéro : 2013/254. La première page du questionnaire consistait en une explication de l’étude. La participation à l’enquête étant libre, nous avons donc considéré celle-ci comme le consentement du répondant. Résultats : 507 femmes ont répondu à ce sondage (8 femmes ont dû être éliminées de l’échantillon : 6 car le dernier enfant avait minimum 3 ans et 2 parce qu’elles étaient enceintes) : 74,5% des femmes habitaient en Belgique, 23,6% en France et 1,8% de pays divers (Canada, Luxembourg, Burkina Faso, Nouvelle Calédonie, Tunisie). Leur moyenne d’âge était de 30,5 ± 4,25 ans et 54,6% étaient des primipares. Parmi ces femmes, 90,2% ont utilisé internet pour répondre à des questions relatives à la période postnatale concernant leur enfant (82,3%) et/ou leur propre santé (71,3%). Ces femmes recherchent souvent des informations concernant l’allaitement maternel (75,2%), les aliments à introduire dans l’alimentation de l’enfant (62,1%), les dents (48,3%), les pics de croissance de l’enfant (43,4%), les petits boutons que les enfants peuvent présenter (38,2%), leur sexualité (30,7%) ou encore leur perte de poids (24,4%). Elles recherchent également des informations (23,3%) sur des questions plus « ponctuelles » de situation de la vie de tous les jours (ex : douleur de césarienne, sommeil de l’enfant, dépression postnatale, ...). Les raisons de ces recherches sont diverses mais les trois plus courantes sont le fait de vouloir trouver l’information par soi-même (87,3%), trouver des informations sur des symptômes présentés par l’enfant (79,6%) et compléter les informations fournies par un professionnels de la santé (65,2%). La majorité des femmes (90,9%) disent ne pas avoir un site unique de référence et recherche les informations sur différents sites. Beaucoup (81,1%) pensent que les professionnels de santé devraient suggérer des sites internet adaptés aux nouvelles mamans dans lesquels elles pourraient trouver des informations utiles pour leur post-partum et leur enfant. Les informations trouvées sur internet sembleraient avoir influencé la façon dont les femmes pensaient gérer leur enfant dans 51,8% des cas. Malgré qu’elles jugent que les informations qu’elles trouvent sur internet leur sont plutôt utiles (84,3%), elles n’attribuent qu’une note moyenne de 5,28 ± 1,68/10 quant à la qualité des informations qu’elles trouvent sur internet. Conclusion : Il existe un grand besoin d’information durant la période postnatale. Internet semblerait être une solution largement utilisée par les femmes pour combler ce besoin bien qu’elles ne semblent pas toujours satisfaites de la qualité des informations qu’elles y trouvent. Un site internet centralisé et contrôlé pourrait constituer une piste de solution à exploiter. [less ▲]

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See detailEn quoi l'ajout d'un élément de gamification (badges) impacte la réalisation des tests d'entraînement ?
Marique, Pierre-Xavier ULg; Van de Poël, Jean-François ULg; Hoebeke, Maryse ULg

Conference (2016, May)

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix ... [more ▼]

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix s’est porté sur une plateforme en ligne afin qu’elle soit accessible à chaque instant et de n’importe quel endroit, moyennant une connexion internet. L’étudiant, interrogé sous forme de questions à choix multiples, peut notamment utiliser un simulateur d’examens. Il peut à tout moment générer un test selon trois paramètres : la ou les matières qu’il souhaite travailler, le temps qu’il désire y consacrer et le niveau de maitrise qu’il souhaite atteindre. Dès lors, un test d’entrainement est généré automatiquement selon les critères choisis. L’étudiant peut visualiser son état d’avancement dans la matière grâce à une série de badges qu’il est invité à collecter. Une fois certains badges acquis, l’apprenant a la possibilité de télécharger un « pass » personnel lui donnant accès à une séance de simulation d’examen organisée en amphithéâtre. Cette étude présentera les premiers résultats de cette expérimentation. La corrélation avec les notes obtenues à l’examen ainsi que l’impact de la mise en place des badges dans le dispositif d’un point de vue motivationnel seront étudiés. [less ▲]

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See detailCognition et imagination. Réflexions à partir de Mach, Musil et Wittgenstein
Zincq, Aurélien ULg

Conference (2016, April 29)

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See detailElucidating diversity of thin filamentous mat-forming Antarctic cyanobacteria
Lara, Yannick ULg; Durieu, Benoit ULg; Deblander, Victor ULg et al

Poster (2016, April 29)

Freshwater ecosystems range from glacial cryoecosystems, ice shelf meltwater ponds to perennially ice-covered lakes where conspicuous benthic microbial mat communities constitute most of the biomass. In ... [more ▼]

Freshwater ecosystems range from glacial cryoecosystems, ice shelf meltwater ponds to perennially ice-covered lakes where conspicuous benthic microbial mat communities constitute most of the biomass. In these mats, cyanobacteria form matrices that shelter other organisms, and carry out the primary production. Narrow filamentous cyanobacteria belonging to the genera Leptolyngbya and Phormidium are especially abundant in Antarctic microbial mats and are essential for the formation of matrix. However, the lack of morphological criteria and the small cell size of cyanobacteria belonging to these two genera make their identification problematic. Indeed, they are known as polyphyletic taxa according to botanical and bacteriological criteria. The characterization of strains is the first step for an assessment of the real diversity and for understanding their role in the environment. We designed a polyphasic approach that combines molecular analyses, environmental physiology experiments and microscopic observations. Briefly, we amplified and sequenced three loci (16S rRNA, ITS, and rpoC1) for 31 strains of Leptolyngbya and Phormidium. We performed whole genome sequencing for five strains. Cultures at different stage were observed by light and epifluorescence microscopy. Finally, selected strains were grown in nitrogen-limited. The Leptolyngbya and Phormidium strains were distributed into four lineages. Phylogenetic trees supported the distribution of P. priestleyi strains into at least two potentially new lineages, and L. antarctica strains were separated into one endemic and one cosmopolitan lineage. This was supported by the microscopic observations of 1-year old cultures. Genome analyses revealed the presence of sequences related to the production of secondary metabolites in strains from two of the studied lineages. Secondary metabolites are often known for their antimicrobial activities. Such properties would partly explain how cyanobacterial mats survive to predation and degradation by other bacteria. This work provides the first building block to the understanding of survival strategies developed by mat-forming cyanobacteria and how they succeeded as the most abundant phototrophs on the Antarctic continent. This work was realized in the frame of the BelSPo project CCAMBIO. [less ▲]

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See detailThe CCAMBIO project to characterize the biodiversity and distribution of microorganisms in microbial mats of Antarctic lakes
Durieu, Benoit ULg; Lara, Yannick ULg; Obbels, Dagmar et al

Poster (2016, April 29)

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms in lacustrine microbial mats using a combination of techniques including microscopical observations (light and ... [more ▼]

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms in lacustrine microbial mats using a combination of techniques including microscopical observations (light and electronic microscopy), strain isolation, and molecular diversity assessment using Next Generation Sequencing. The samples were collected in different Antarctic and sub-Antarctic biogeographical regions. A detailed microscopic study of the Antarctic diatom diversity allowed to revise a number of taxa and discover new ones. A multivariate analysis of diatoms showed that these regions hosted different diatom flora. Endemic diatom taxa were also observed, and a multigene molecular phylogeny of Pinnularia borealis showed a high genetic diversity. Pilot studies were conducted for the microeukaryotes and cyanobacteria to select NGS protocols and bioinformatic pipelines. Preliminary multivariate analysis of over 100 samples revealed that distinct biogeographic zones could be recognized in both the prokaryote and eukaryote data, which is in agreement with the classical subdivision of the Antarctic Realm into Maritime Antarctica, Continental Antarctica and the Sub-Antarctic Islands generally observed in plants and animals. Moreover, Sub-Antarctic assemblages harboured more complex foodwebs, with quite diverse metazoan groups. Lakes on the continent, however, were characterised by fewer metazoan groups and a greater importance of microbial herbivores and secondary consumers, including a relative high diversity of ciliates and tardigrades. Variation partitioning analysis revealed that spatial variables that approximated large-scale regional contrasts in historical (e.g. deglaciation history, geological origin) and climatic factors (e.g. mean annual air temperature) significantly explained the largest portion of the observed variation in community structure for eukaryotes, while in the prokaryote data environmental gradients related to conductivity were more important. In a first analysis of microbial mats from five Antarctic lakes and an aquatic biofilm from the Sub-Antarctic, the majority of the cyanobacterial OTUs retrieved were related to filamentous taxa such as Leptolyngbya and Phormidium, which are common genera in Antarctic lacustrine microbial mats. However, other phylotypes related to different taxa such as Geitlerinema, Pseudanabaena, Synechococcus, Chamaesiphon, Calothrix and Coleodesmium were also found. Results revealed a higher diversity than what had been reported using traditional methods based on microscopic observations and cultivation and also highlighted remarkable differences between the cyanobacterial communities of the studied lakes. In the next months, the molecular diversity data will be deposited into the “Microbial Antarctic Resource System (MARS)” presently developed into the webportal ‘biodiversity.aq’. The better knowledge of the diversity and distribution of microorganisms will contribute to a better assessment of their resilience and local/regional responses to global change. [less ▲]

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See detailLa critique génétique dans la collection "Poétique"
Lorent, Fanny ULg

Conference (2016, April 29)

La critique génétique est, comme le dit bien Jean-Louis Jeannelle, une « théorie en quête d’elle-même » , tiraillée entre la tradition philologique et les avancées structuralistes. Elle doit sans cesse, à ... [more ▼]

La critique génétique est, comme le dit bien Jean-Louis Jeannelle, une « théorie en quête d’elle-même » , tiraillée entre la tradition philologique et les avancées structuralistes. Elle doit sans cesse, à la fois, se défaire des suspicions positivistes qui pèsent sur elle et justifier son appartenance possible à la (une ?) poétique . Nous voudrions étudier, dans cette communication, les mécanismes de légitimation de cette discipline aux contours épistémologiques complexes au sein même de la collection « Poétique », qui accueillit, en 1998, Les brouillons de soi de Philippe Lejeune et, en 2011, Logiques du brouillon de Daniel Ferrer. Comment les auteurs vont-ils, dans leur ouvrage, justifier leur parution au sein d’une collection dont les présupposés théoriques semblent, a priori, contraires à ceux présidant à leur travail ? Quelles en sont alors les implications méthodologiques, pour chacune des deux disciplines ? [less ▲]

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See detailUse of stable isotope ratios to delineate coastal benthic food web structure in Adélie Land (East Antarctica)
Michel, Loïc ULg; Dubois, Philippe; Eleaume, Marc et al

Poster (2016, April 29)

Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice ... [more ▼]

Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, in some parts of East Antarctica sea ice cover tends to increase, possibly in relation with changes in atmospheric circulation. Changes in sea ice cover are likely to influence benthic food web structure through modifications of benthic-pelagic coupling, disruption of benthic production and/or modifications of benthic community structure (i.e. resource availability for benthic consumers). Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using stable isotope ratios of C, N and S, we examined importance of several organic matter sources (benthic macroalgae, benthic biofilm, sympagic algae, suspended particulate organic matter and penguin guano) for nutrition of over 20 taxa of benthic invertebrates (sponges, sea anemones, nemerteans, sessile and mobile polychaetes, gastropods, bivalves, sipunculids, pycnogonids, amphipods, sea stars, sea urchins and sea cucumbers) spanning most present functional guilds. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden changes in environmental conditions and trophic resource availability. [less ▲]

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See detailLe droit du travail (re)visité par la Cour constitutionnelle
Kéfer, Fabienne ULg

in Boufflette, Sophie (Ed.) La cour constitutionnelle. De l'art de modeler de droit pour préserver l'égalité (2016, April 29)

L'étude porte sur le rôle de la Cour constitutionnelle dans l’édification du droit du travail. Arrêt après arrêt, elle consolide la norme attaquée ou au contraire redessine – ou presse le législateur de ... [more ▼]

L'étude porte sur le rôle de la Cour constitutionnelle dans l’édification du droit du travail. Arrêt après arrêt, elle consolide la norme attaquée ou au contraire redessine – ou presse le législateur de redessiner – les contours de cette branche du droit fortement marquée par son histoire. Elle se penche sur un peu plus de trente arrêts prononcés par la Cour constitutionnelle, principalement depuis 2008, dans les domaines suivants : le travail à temps partiel (chapitre 1), le droit de la non-discrimination (chapitre 2), certaines questions intéressant le licenciement, à savoir la durée du préavis, les mesures destinées à stimuler l’employabilité, la motivation, la notion de rémunération en cours en cas de réduction temporaire des prestations de travail, et l’indemnité d’éviction du représentant de commerce (chapitres 3 à 7), les distinctions entre employés et ouvriers autres que les conditions de licenciement (chapitre 8), la procédure de réorganisation judiciaire (chapitre 9) et la prescription (chapitre 10). [less ▲]

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See detailPhysical activity: an unknown concept
Cloes, Marc ULg

Conference (2016, April 29)

Physical educators do not have necesseraly good representations about physical activity and sedentariness. During the presentation, participants will be involved in an interactive process aiming to ... [more ▼]

Physical educators do not have necesseraly good representations about physical activity and sedentariness. During the presentation, participants will be involved in an interactive process aiming to underline the main concepts that they should use in order to become effective agents of physical activity promotion. [less ▲]

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See detailLa ligne et la boucle. Michel Strogoff ou l'involution
Durand, Pascal ULg

Conference (2016, April 28)

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See detailPercevoir et reconnaître des symboles. La théorie de la représentation iconique de Dominic Lopes.
Hagelstein, Maud ULg

Conference (2016, April 28)

Perceiving and recognizing symbols. Dominic Lopes’ theory of iconic representation. In his works on the epistemological value of images (Understanding Pictures - 1996), Dominic Lopes (Department of ... [more ▼]

Perceiving and recognizing symbols. Dominic Lopes’ theory of iconic representation. In his works on the epistemological value of images (Understanding Pictures - 1996), Dominic Lopes (Department of Philosophy - University of British Columbia) develops an analytical aesthetics primarily concerned with iconic representation. His analysis distinguishes two models of iconic representation comprehension. In the first model, inspired by perceptual approaches like that of Richard Wollheim, the process of image recognition is rooted in perception (to sum it up: perceptualism embraces the idea of « likeness » between the image and what it represents). One of this model’s shortcomings, however, is that it too readily assumes that perception can be a natural, straightforward process. Indeed, iconic representation can not be understood through perception alone, as vision is of course influenced by cultural and, most of all, cognitive processes. A representative model thus needs to account for the ways in which iconic recognition differs from ordinary visual recognition. In the second model, which build off of symbolic approaches like that of Nelson Goodman, iconic representation works the same way as other types of symbols, particularly linguistic ones. Thus, this approach considers the similarities between images and language (representations which are both affected by processes of denotation and predication). However, we all know how strongly image theoreticians have been resisting the linguistic paradigm (iconic turn topic): some worry about overlooking the image’s semantic density in favor of its « simple » descriptive quality. Lopes finds a path between these two models by developing a « theory of aspect recognition », which incorporates perceptive elements into a symbolic structure. According to Lopes, if we agree that images belong to symbolic systems of denotation, then « they might be symbols for which the reference is dependent on the carrying out of perceptive aptitudes », a claim which my talk will explore. I will also discuss how Lopes’ theory accounts for skills acquisition (the capacity to recognize) through images, and shows how images help these skills progressively develop. [less ▲]

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See detailAdministration of Third-Party Mesenchymal Stromal Cells at the Time of Kidney Transplantation: Interim Safety Analysis at One-Year Follow-Up
Erpicum, Pauline ULg; WEEKERS, Laurent ULg; DETRY, Olivier ULg et al

Conference (2016, April 28)

Objective. Mesenchymal stromal cells (MSC) therapy has been suggested in kidney transplantation (KTx). We report on the 1-year follow-up of an open-label phase I trial using MSC at the time of KTx ... [more ▼]

Objective. Mesenchymal stromal cells (MSC) therapy has been suggested in kidney transplantation (KTx). We report on the 1-year follow-up of an open-label phase I trial using MSC at the time of KTx. Methods. On postoperative day 3 (D3), third-party MSC (~2.0x106/kg) were administered to 7 non-immunized first-transplant recipients from deceased donors, under standard immunosuppression (Basiliximab, Tacrolimus, MMF and steroids). No HLA matching was required for MSC donors. In parallel, 7 comparable KTx recipients were included as controls. Written informed consent was obtained from all participants. Results. No hemodynamic or immune-allergic side-effect was noted at the time of MSC injection. Still, 1 patient with a history of ischemic heart disease had a NSTEMI ~3h after MSC infusion. Four MSC patients presented with CMV reactivation within 165 ± 96 days post KTx, whereas 3 controls had positive polyoma-BK viremia within 92 ± 4d post KTx. Three MSC patients were affected by pneumonia within 269 ± 98d post KTx, whereas 3 controls had urinary infection within 48 ± 43d post KTx. No MSC engraftment syndrome was observed. At D14, eGFR in MSC and control groups was 47.1 ± 6.8 and 39.7 ± 5.9 ml/min, respectively (p, 0.05). At 1 year, eGFR in MSC and control groups was 43.1 ± 17.8 and 53.9 ± 13.4 ml/min, respectively (p, 0.25). At 3-month protocol biopsy, no rejection was evidenced in MSC or control patients. Later on, 1 acute rejection was diagnosed at D330 in 1 MSC patient. No biopsy-proven AR was noted in controls. Three patients developed anti-HLA antibodies against MSC (n=1) or shared kidney/MSC (n=2) mismatches. Conclusions. MSC infusion was safe in all patients except one. Incidence of opportunist and non-opportunist infections was similar in both MSC and control groups. No MSC engraftment syndrome was documented. No difference in eGFR was found at 1 year post KTx. Putative immunization against MSC was observed in 3 patients. [less ▲]

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See detailPrêt "coup de pouce": un nouvel incitant fiscal wallon pour le financement des entreprises débutantes
Bourgeois, Marc ULg; Pace, Xavier ULg

in Bourgeois, Marc (Ed.) Les incitants fiscaux pour les PME - actualités et aspects comptables (2016, April 28)

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See detailModelling of long-term deep renovation strategies for the Belgian building stock
Ruellan, Guirec ULg

Poster (2016, April 28)

To achieve the EU energy targets for 2050, the construction sector has to perform major transformations. In Belgium, the majority of building stock is particularly old and energy inefficient. The high ... [more ▼]

To achieve the EU energy targets for 2050, the construction sector has to perform major transformations. In Belgium, the majority of building stock is particularly old and energy inefficient. The high performance of new constructions represented in the nearly zero energy buildings target is not sufficient to ensure the efficiency of the overall building sector. Therefore, it is crucial to put in place a progressive renovation policy. Despite the different renovation strategies and projects that took place in the recent year in Belgium, the overall renovation rate remains almost stable for the last ten years. This study focuses on the renovation market in Belgium and analyzes the factors that influence the evolution of the renovation rate. The objective is the identification and development of effective strategies bypass that leads to increased renovation rates in Belgium. The research methodology is based on an iterative process, based on a systematic literature review of Flemish and Walloon projects, publications and policy. These first work package will allow to identify factors influencing the renovation rate and in other hand to build a model of the existing building stock. Impacts of the influencing factors on the building stock are simulated in the fourth work package in order to propose an action plan in the last part. Three mains outcomes are expected: A model of the existing building stock in Belgium and its retrofit potential, a simulation of the effects of different strategies used to increase the renovation rate in Belgium and a theoretical action plan on strategies to increase the rate of renovation in Belgium. These results are necessary to inform and support the decision making of policy makers, municipalities and operational planning authorities across Belgium. [less ▲]

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See detailDiscontinuity lines in superconducting films with predefined edge defects
Brisbois, Jérémy ULg

Conference (2016, April 27)

We present a thorough investigation by magneto-optical imaging of the magnetic flux penetration in Nb thin films with lithographically defined border indentations. We demonstrate that discontinuity lines ... [more ▼]

We present a thorough investigation by magneto-optical imaging of the magnetic flux penetration in Nb thin films with lithographically defined border indentations. We demonstrate that discontinuity lines (d-lines), caused by the abrupt bending of current streamlines around the indentations, depart from the expected parabolic trend close to the defect and depend on the shape and size of the indentation as well as on the temperature. These findings are backed up and compared with theoretical results obtained by numerical simulations and analytical calculations highlighting the key role played by demagnetization effects and the creep exponent n. In addition, we show that the presence of nearby indentations and submicrometer random roughness of the sample border can severely modify the flux front topology and dynamics. Strikingly, in contrast to what has been repeatedly predicted in the literature, we do not observe that indentations act as nucleation spots for flux avalanches, but they instead help to release the flux pressure and avoid thermomagnetic instabilities. [less ▲]

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See detailLe diabète et la sélection médicale
PAQUOT, Nicolas ULg

Conference (2016, April 27)

Detailed reference viewed: 24 (1 ULg)
Peer Reviewed
See detailOikoi and State. A new light on Upper Mesopotamian economic system
Mas, Juliette ULg

Conference (2016, April 27)

Detailed reference viewed: 16 (2 ULg)
See detailSingle-Molecule Force spectroscopy on synthetic Foldamers
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Poster (2016, April 26)

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See detailIsolation and characterization of mutants deficient in four steps of the phylloquinone biosynthesis pathway in Chlamydomonas reinhardtii.
Emonds-Alt, Barbara ULg; Remacle, Claire ULg; Cardol, Pierre ULg

Poster (2016, April 26)

In photosystem I (PSI), phylloquinone participates to electron transfer as secondary electron acceptor (A1). The phylloquinone biosynthesis pathway, previously characterized by reverse genetic in ... [more ▼]

In photosystem I (PSI), phylloquinone participates to electron transfer as secondary electron acceptor (A1). The phylloquinone biosynthesis pathway, previously characterized by reverse genetic in Synechocystis sp. PCC 6803, involves 8 enzymatic steps from chorismate [1]. In the green alga Chlamydomonas reinhardtii, characterization of phylloquinone biosynthesis was still partial and only one mutant deficient for MEND was characterized [2]. In the present work, we found MENA-H homologs in C. reinhardtii genomic database. In particular, MENF, MEND, MENC, and MENH catalytic domains are present in a single ORF (named PHYLLO by similarity to gene organisation in Arabidopsis). We then took advantage of the fact that a double reduction of plastoquinone (PQ) in PQH2 occurs in anoxia into the A1 site in the mend mutant, interrupting photosynthetic electron transfer [3], to isolate new phylloquinone-deficient strains. UPLC-MS analysis confirmed the absence of phylloquinone in four news mutants impaired in MENA, MENB, MENC (PHYLLO) and MENE. Despite this loss, men mutants are still able to grow in low light but are high light-sensitive. In low light, the level of active PSII in men mutants is identical to that of the wild-type, but the level of active PSI is reduced by 30-40% as assayed by spectroscopic measurements. This decrease is more pronounced when cells are exposed to high light intensities during 4 hours. The level of active PSI is ~ 10% of wild-type cells and the electron photosynthetic transfer is reduced accordingly. Reorganization of the photosynthetic apparatus following lack of phylloquinone in men mutants is discussed. [less ▲]

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See detailJupiter’s magnetopause: A search for reconnection and wave signatures
Bonfond, Bertrand ULg; Kivelson, Margaret; Khurana, Krishan et al

Conference (2016, April 26)

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See detailIsolation and characterization of mutants deficient in four steps of the phylloquinone biosynthesis pathway in Chlamydomonas reinhardtii.
Emonds-Alt, Barbara ULg; Remacle, Claire ULg; Cardol, Pierre ULg

Poster (2016, April 26)

In photosystem I (PSI), phylloquinone participates to electron transfer as secondary electron acceptor (A1). The phylloquinone biosynthesis pathway, previously characterized by reverse genetic in ... [more ▼]

In photosystem I (PSI), phylloquinone participates to electron transfer as secondary electron acceptor (A1). The phylloquinone biosynthesis pathway, previously characterized by reverse genetic in Synechocystis sp. PCC 6803, involves 8 enzymatic steps from chorismate [1]. In the green alga Chlamydomonas reinhardtii, characterization of phylloquinone biosynthesis was still partial and only one mutant deficient for MEND was characterized [2]. In the present work, we found MENA-H homologs in C. reinhardtii genomic database. In particular, MENF, MEND, MENC, and MENH catalytic domains are present in a single ORF (named PHYLLO by similarity to gene organisation in Arabidopsis). We then took advantage of the fact that a double reduction of plastoquinone (PQ) in PQH2 occurs in anoxia into the A1 site in the mend mutant, interrupting photosynthetic electron transfer [3], to isolate new phylloquinone-deficient strains. UPLC-MS analysis confirmed the absence of phylloquinone in four news mutants impaired in MENA, MENB, MENC (PHYLLO) and MENE. Despite this loss, men mutants are still able to grow in low light but are high light-sensitive. In low light, the level of active PSII in men mutants is identical to that of the wild-type, but the level of active PSI is reduced by 30-40% as assayed by spectroscopic measurements. This decrease is more pronounced when cells are exposed to high light intensities during 4 hours. The level of active PSI is ~ 10% of wild-type cells and the electron photosynthetic transfer is reduced accordingly. Reorganization of the photosynthetic apparatus following lack of phylloquinone in men mutants is discussed. [less ▲]

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See detailThe many aurorae of Jupiter: proxis of the magentospheric dynamics
Bonfond, Bertrand ULg

Conference (2016, April 25)

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See detailModelling Urban Expansion: A Multiple Urban-Densities Approach
El Saeid Mustafa, Ahmed Mohamed ULg; Saadi, Ismaïl ULg; Cools, Mario ULg et al

in Proceedings of GEOProcessing 2016 (2016, April 24)

Most existing spatio-temporal urban expansion models consider urban land-use as a binary process, through the identification of urban versus non-urban areas. The main aim of this study is to analyze and ... [more ▼]

Most existing spatio-temporal urban expansion models consider urban land-use as a binary process, through the identification of urban versus non-urban areas. The main aim of this study is to analyze and model the expansion of multiple urban densities in Wallonia, Belgium. To this end, this study employs a multinomial logistic regression model that enables to visualize the consequence of different urban densities expansion. Cadastral datasets of years 2000 and 2010 are used to set four urban classes (non-urban, low-density, medium-density and high-density urban). Besides, several socio-economic, geographic and political driving forces dealing with urban development were operationalized to create maps of urban expansion probability for each urban density class. These probability maps are then utilized to predict future urban expansions for years 2020 and 2030. The model is validated using relative operating characteristic method for different urban classes. Our results suggest that different urban densities expansions are mainly linked to zoning status, neighboring areas that are urban and accessibility. Most importantly, this study highlights that the contribution of different driving forces to urban expansion process varies along with urban density. [less ▲]

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See detailValidity of algometry and video assessment to diagnose pain in sheep with knee synovitis
Niessen, J; Nisolle, JF; Hontoir, F et al

Poster (2016, April 23)

Reasons to perform study. To assess lameness in animals, semi-objective scales are used. Video is sometimes used to enable blinding of the clinician. In addition, the assessment of pain is particularly ... [more ▼]

Reasons to perform study. To assess lameness in animals, semi-objective scales are used. Video is sometimes used to enable blinding of the clinician. In addition, the assessment of pain is particularly difficult in animals since they cannot report their feelings. The interpretation of the reactions of the animals can be different between observers. A method to quantify pain is the measure of mechanical nociceptive thresholds (MNT), a method called algometry. Since synovitis is often linked to swelling of periarticular tissues and to synovial fluid effusion, palpation of the joint is also a useful test. The objectives of the current study were to assess in sheep whether (1) video assessment of lameness is in agreement with real observation; (2) algometry of the knee is correlated with lameness evaluation; (3) algometry is correlated with identification of swelling by palpation. Material and methods. The population of sheep enrolled in a controlled trial at the Ovine Research Center of UNamur was used for the current study. Results. There was a moderate inter-rater agreement (value of kappa was 0,41) between the experimenter who evaluated the ewes on site and the one who watched the videos. No significant correlation was identified between lameness scores and algometry. A negative correlation (algometry reactive threshold is lower when palpation score is higher) was identified between palpation scores and MNT (P<0.05). Discussion. Video assessment can be used in research to assess lameness. The experience of the observer must be taken into account. Algometry is not entirely valid since an adaptation or learning process seems to develop in sheep. [less ▲]

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See detailEffect of Ribes nigrum leaf extracts on endothelium-dependent vasorelaxation
Tabart, Jessica; Shini-Kerth, Valérie; PINCEMAIL, Joël ULg et al

Poster (2016, April 22)

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See detailUsing a dynamic vegetation model for future projections of crop yields : application to Belgium in the framework of the VOTES and MASC projects
Jacquemin, Ingrid ULg; Henrot, Alexandra-Jane ULg; Fontaine, Corentin M. et al

Poster (2016, April 22)

Dynamic vegetation models (DVM) were initially designed to describe the dynamics of natural ecosystems as a function of climate and soil, to study the role of the vegetation in the carbon cycle. These ... [more ▼]

Dynamic vegetation models (DVM) were initially designed to describe the dynamics of natural ecosystems as a function of climate and soil, to study the role of the vegetation in the carbon cycle. These models are now directly coupled with climate models in order to evaluate feedbacks between vegetation and climate. But DVM characteristics allow numerous other applications, leading to amelioration of some of their modules (e.g., evaluating sensitivity of the hydrological module to land surface changes) and developments (e.g., coupling with other models like agent-based models), to be used in ecosystem management and land use planning studies. It is in this dynamic context about DVMs that we have adapted the CARAIB (CARbon Assimilation In the Biosphere) model. One of the main improvements is the implementation of a crop module, allowing the assessment of climate change impacts on crop yields. We try to validate this module at different scales: - from the plot level, with the use of eddy-covariance data from agricultural sites in the FLUXNET network, such as Lonzée (Belgium) or other Western European sites (Grignon, Dijkgraaf,. . . ), - to the country level, for which we compare the crop yield calculated by CARAIB to the crop yield statistics for Belgium and for different agricultural regions of the country. Another challenge for the CARAIB DVM was to deal with the landscape dynamics, which is not directly possible due to the lack of consideration of anthropogenic factors in the system. In the framework of the VOTES and the MASC projects, CARAIB is coupled with an agent-based model (ABM), representing the societal component of the system. This coupled module allows the use of climate and socio-economic scenarios, particularly interesting for studies which aim at ensuring a sustainable approach. This module has particularly been exploited in the VOTES project, where the objective was to provide a social, biophysical and economic assessment of the ecosystem services in four municipalities under urban pressure in the center of Belgium. The biophysical valuation was carried out with the coupled module, allowing a quantitative evaluation of key ecosystem services as a function of three climatic and socio-economic scenarios. [less ▲]

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See detailHigh anthocyanins content of commercial blackcurrant juices induced endothelium-dependent relaxation in isolated porcine coronary arteries
Kevers, Claire ULg; Shini-Kerth, Valérie; Tabart, Jessica et al

Poster (2016, April 22)

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See detailKeratinocyte RabGEF1 maintains skin homeostasis in vivo.
Marichal, Thomas ULg

Conference (2016, April 22)

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See detailGuerrier de Dieu ou mercenaire dangereux et inutile ? Usages de la relation de guerre par l’internonce Bichi comme stratégie de déstabilisation du duc Charles IV de Lorraine (1645-1646).
Regibeau, Julien ULg

Conference (2016, April 22)

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine. La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de ... [more ▼]

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine. La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de tensions qui font suite à la bulle d’excommunication fulminée par le pape Urbain VIII à l’encontre du duc. Pour le Saint-Siège l’enjeu diplomatique de ce geste est grand. Charles IV, duc de Lorraine et de Bar, est en effet un membre important du parti des dévots, hostile à Richelieu et à sa politique d’abaissement de la maison d’Autriche. Réfugié aux Pays-Bas espagnols depuis l’occupation de ses États par le cardinal, en 1634, il prend part aux dernières phases de la guerre de Trente Ans en mettant ses troupes au service des Habsbourg, aussi bien en France que dans l’Empire. Or, l’excommunication du duc a peu à peu créé des dissensions au sein du clergé et du gouvernement des Pays-Bas. L’irritation qui règne menacerait même la bonne conduite de la guerre menée contre la France et ses alliés protestants. Si, à première vue, la papauté ne prend pas une part active dans ce conflit, elle veille, à travers ses nonces, aux intérêts catholiques qui sont en jeu. À l’occasion de ma communication, je souhaiterais étudier en détails la politique de l’internonce Bichi durant les mois qui précèdent et qui suivent l’absolution de Charles IV. Je désire, pour ce faire, m’arrêter sur l’une des stratégies que le prélat met en place pour mener le duc à se conformer aux instances du Saint-Siège ; à savoir jeter le discrédit sur l’action militaire de celui-ci. La déconstruction systématique de l’image militaire du duc par l’internonce puise ses arguments dans une rhétorique humaniste, largement diffusée par Machiavel et Guichardin, pour bâtir l’image, à la fois archétypale et ancrée dans le présent de la guerre de Trente Ans, d’un condottiere dangereux et inutile, dont les Habsbourg devraient se prémunir. Prenant place au sein d’un arsenal de ressources variées (maîtrise de l’information, entreprise de désinformation, emploi de différents registres de discours, entretien de réseaux d’intérêts,…), cette stratégie dévoile son efficacité à partir du moment où elle est intériorisée par la Curie romaine et fournit un argument supplémentaire à cette dernière pour faire pression sur le gouverneur-général des Pays-Bas, le marquis de Castel Rodrigo. La représentation propagée par l’internonce peine cependant à masquer l’image, toute aussi efficace, de guerrier de Dieu que Charles IV, héritier des Guises et de l’idéologie de la croisade, convoque et entretient. Il ressort donc de la correspondance de l’internonce une représentation plurielle et ambivalente du duc-soldat ; paradoxe apparent qui reflète bien l’état de tension qui règne alors au sein de la cour de Bruxelles autour de Charles IV et de son excommunication. [less ▲]

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See detailAssessment of a design to monitor the influence of crop residue management on the dynamics of soil water content with ERT
Chelin, Marie ULg; Hiel, Marie-Pierre ULg; Hermans, Thomas ULg et al

Poster (2016, April 21)

Choices related to crop residue management affect the soil structure. As a consequence, they may determinethe spatio-temporal dynamics of water content and eventually the crop yields. In order to better ... [more ▼]

Choices related to crop residue management affect the soil structure. As a consequence, they may determinethe spatio-temporal dynamics of water content and eventually the crop yields. In order to better understand the influence of these strategies on hydraulic processes occurring at the plot scale, we opted for the use electrical resistivity tomography (ERT). This approach presents the advantage to limit soil disturbance but is still faced to important challenges when applied in an agricultural field context. Especially changing soil-electrode contact has to be considered, as it can lead to bad quality data, especially for setups with small electrodes and small inter-electrode distance. The objective of this study was to test the efficiency of a high-resolution 3-D field measurement design to properly assess the dynamics of soil water content. ERT measurements were conducted in a Cutanic Siltic Luvisol in Gembloux, Belgium, on two plots of 2m^2 ploughed in Oct 2014 at a depth of 25 cm and sown with maize in April 2015. The plants were removed on one of the plots in order to obtain a bare soil reference. A grid of 98 surface stainless steel electrodes was layed-out on each plot and four sticks supporting each eight stainless steel electrodes were vertically inserted into the soil up to 1.20 m to get more detailed information in depth. The experiments were performed between Jul and Oct 2015, in order to get measurements both in dry and wet periods. For surface and borehole monitoring, a dipole-dipole array configuration including in-line and cross-line measurements was adopted. Normal and reciprocal measurements were performed systematically to assess the data quality: only the datasets with a mean reciprocal error lower than 3% were considered for the data inversion. This contribution will show the first inverted results showing the complexity of experimental design and data analysis for high-resolution, timelapse ERT in field conditions. Based on these results, we will draw conclusions about a minimal data set to be obtained in our upcoming field experiments. [less ▲]

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See detailHeart failure assessment with a multiscale model
Negroni, Jorge; Cabrera-Fischer, Edmundo; Kosta, Sarah ULg et al

Poster (2016, April 21)

Many cardiac diseases lead to heart failure (HF) causing increasing morbidity and mortality worldwide. Several alterations at the myocyte level have been identified, but their specific influence on ... [more ▼]

Many cardiac diseases lead to heart failure (HF) causing increasing morbidity and mortality worldwide. Several alterations at the myocyte level have been identified, but their specific influence on contractile and hemodynamic impairment is not yet clear. Mathematical modeling is a tool to address this issue enabling the analysis of individual myocyte changes on the overall circulatory response. Some myocyte models have been able to reproduce the impact of HF on experimentally detected myocyte components (1), but their integration into a ventricular model forming part of a multiscale circulatory approach has not been fully undertaken. Thus, the aim of this study is to compare the experimental hemodynamic and regional contractile response to acute HF versus a multiscale model based on a human myocyte representation. The experimentally-validated multiscale model shows adequate coupling between myocyte-derived left ventricular chamber and circulatory properties , and would be useful to predict the contractile and hemodynamic response to HF changes in myocyte variables. [less ▲]

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See detailOccurrence, fate and risk assessment of personal care products in river-groundwater interface
Jurado Elices, Anna ULg; Serra-Roig, M. Pau; Diaz-Cruz, M. Silvia et al

Conference (2016, April 21)

This work presents the occurrence and fate of selected personal care products (PCPs) in the urban river-groundwater interface. To this end, urban groundwater and river samples were collected in Sant Adrià ... [more ▼]

This work presents the occurrence and fate of selected personal care products (PCPs) in the urban river-groundwater interface. To this end, urban groundwater and river samples were collected in Sant Adrià del Besòs (NE of Spain) and a total of 16 PCPs were analyzed including benzophenone derivatives, camphor derivatives, p-aminobenzoic acid derivatives, triazoles and parabens in three different campaigns (from May 2010 to July 2014). These compounds reach the aquifer through the recharge of River Besòs that receives large amounts of effluents from waste water treatment plants. Results shown that most of compounds were not or barely detected (maximum concentrations around 30 ng/L) in groundwater samples during the different sampling campaigns. Only two triazoles, named as benzotriazole (BZT) and methyl benzotriazol (MeBZT) were found at high concentrations in groundwater samples (maximum concentration around 2000 ng/L). The fate of PCPs in the aquifer was assessed using mixing analysis considering the temporal variability of the River Besòs. Overall, measured groundwater concentrations were significantly much lower than those estimated by the mixing of the river water. This observation suggested that most of the PCPs are naturally removed when river water infiltrates the aquifer. However, some compounds were more persistent in the aquifer. These compounds were in descending order: the triazoles MeBZT and BZT followed by the camphor derivative 4MBC. The measured concentrations allowed us to assess the environmental risk posed by the selected UV-Fs (e.g. benzophenone derivatives) in the river-groundwater samples. Hazard Quotients (HQs) for diferent aquatic species were calculated in order to characterise the ecotoxicity potential of the studied compounds in the river-groundwater interface. HQ values will be presented and discussed in the presentation. [less ▲]

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See detailSupporting integrated and systemic management of windthrow crises by public decision-makers
Riguelle, Simon ULg; Hebert, Jacques ULg; Lejeune, Philippe ULg et al

Poster (2016, April 21)

This poster presents the development of an integrated framework for systemic management of storm damage risk in Wallonia (Belgium) and how it can be implemented throughout the risk management cycle with ... [more ▼]

This poster presents the development of an integrated framework for systemic management of storm damage risk in Wallonia (Belgium) and how it can be implemented throughout the risk management cycle with user-friendly tools and suitable methodologies. [less ▲]

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See detailAssessing heat tracing experiment data sets for direct forecast of temperature evolution in subsurface models: an example of well and geophysical monitoring data
Hermans, Thomas ULg; Klepikova, Maria; Caers, Jef

Conference (2016, April 21)

Hydrogeological inverse modeling is used for integrating data and calibrating subsurface model parameters. On one hand, deterministic approaches are relatively fast but fail to catch the uncertainty ... [more ▼]

Hydrogeological inverse modeling is used for integrating data and calibrating subsurface model parameters. On one hand, deterministic approaches are relatively fast but fail to catch the uncertainty related to the spatial distribution of model parameters. On the other hand, stochastic inverse modeling is time-consuming and sampling the full high-dimensional parameter space is generally impossible. Even then, the end result is not the inverted model itself, but the forecast built from such models. In this study, we investigate a prediction-focused approach (PFA) in order to derive a direct statistical relationship between data and forecast without explicitly calibrating any models to the data. To derive this relationship, we first sample a limited number of models from the prior distribution using geostatistical methods. For each model, we then apply two forward simulations: the first corresponds to the forward model of the data (past), the second corresponds to the forward model of the forecast (future). The relationship between observed data and forecast is generally highly non-linear, depending on the complexity of the prior distribution and the differences in the two forward operators. In order to derive a useful relationship, we first reduce the dimension of the data and the forecast through principal component analysis (PCA) related techniques in order to keep the most informative part of both sets. Then, we apply canonical correlation analysis (CCA) to establish a linear relationship between data and forecast in the reduced space components. If such a relationship exists, it is possible to directly sample the posterior distribution of the forecast with a multi-Gaussian framework. In this study, we apply this methodology to forecast the evolution with time of the distribution of temperature in a control panel in an alluvial aquifer. We simulate a heat tracing experiment monitored with both well logging probes and electrical resistivity tomography. We show (1) that the proposed method can be used to quantify the uncertainty on the forecast both spatially and temporally and (2) that spatially-distributed data acquired through geophysical methods help to significantly reduce the uncertainty of the posterior. [less ▲]

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See detailTime lapse imaging of water content with geoelectrical methods: on the interest of working with absolute water content data
Dumont, Gaël ULg; Pilawski, Tamara ULg; Robert, Tanguy et al

Poster (2016, April 21)

The electrical resistivity tomography is a suitable method to estimate the water content of a waste material and detect changes in water content. Various ERT profiles, both static data and time-lapse ... [more ▼]

The electrical resistivity tomography is a suitable method to estimate the water content of a waste material and detect changes in water content. Various ERT profiles, both static data and time-lapse, where acquired on a landfill during the Minerve project. In the literature, the relative change of resistivity ( Delta rho/rho ) is generally computed. For saline or heat tracer tests in the saturated zone, the Delta rho/rho can be easily translated into pore water conductivity or underground temperature changes (provided that the initial salinity or temperature condition is homogeneous over the ERT panel extension). For water content changes in the vadose zone resulting of an infiltration event or injection experiment, many authors also work with the Delta rho/rho or relative changes of water content Delta theta /theta (linked to the change of resistivity through one single parameter: the Archie’s law exponent “m”). This parameter is not influenced by the underground temperature and pore fluid conductivity ( rho_w) condition but is influenced by the initial water content distribution. Therefore, you never know if the loss of / signal is representative of the limit of the infiltration front or more humid initial condition. Another approach for the understanding of the infiltration process is the assessment of the absolute change of water content ( Delta theta ). This requires the direct computation of the water content of the waste from the resistivity data. For that purpose, we used petrophysical laws calibrated with laboratory experiments and our knowledge of the in situ temperature and pore fluid conductivity parameters. Then, we investigated water content changes in the waste material after a rainfall event ( Delta theta = Delta theta /theta * theta ). This new observation is really representatives of the quantity of water infiltrated in the waste material. However, the uncertainty in the pore fluid conductivity value may influence the computed water changes ( Delta theta =k*m*(rho_w)^1/2 ; where “m” is the Archie’s law exponent). Using these two complementary approaches, we analyzed the effect a major rainfall (20-30 mm in 2 hours) that occurred on the test site, characterized by a vegetalized and relatively dry zone and a devegatelized and humid zone. We intended to prove that most of the information contained in the Delta theta /theta distribution is the initial water content distribution in the ground.Water addition in dry zones resulting in large relative changes. The computation of the Delta theta is necessary to demonstrate preferential infiltration through the capping in a restricted zone of the vegetalized area. [less ▲]

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See detailHigh-resolution climate and land surface interactions modeling over Belgium: current state and decennial scale projections
Jacquemin, Ingrid ULg; Henrot, Alexandra-Jane ULg; Beckers, Veronique et al

Poster (2016, April 21)

The interactions between land surface and climate are complex. Climate changes can affect ecosystem structure and functions, by altering photosynthesis and productivity or inducing thermal and hydric ... [more ▼]

The interactions between land surface and climate are complex. Climate changes can affect ecosystem structure and functions, by altering photosynthesis and productivity or inducing thermal and hydric stresses on plant species. These changes then impact socio-economic systems, through e.g., lower farming or forestry incomes. Ultimately, it can lead to permanent changes in land use structure, especially when associated with other non-climatic factors, such as urbanization pressure. These interactions and changes have feedbacks on the climate systems, in terms of changing: (1) surface properties (albedo, roughness, evapotranspiration, etc.) and (2) greenhouse gas emissions (mainly CO2, CH4, N2O). In the framework of the MASC project (« Modelling and Assessing Surface Change impacts on Belgian and Western European climate »), we aim at improving regional climate model projections at the decennial scale over Belgium and Western Europe by combining high-resolution models of climate, land surface dynamics and socio-economic processes. The land surface dynamics (LSD) module is composed of a dynamic vegetation model (CARAIB) calculating the productivity and growth of natural and managed vegetation, and an agent-based model (CRAFTY), determining the shifts in land use and land cover. This up-scaled LSD module is made consistent with the surface scheme of the regional climate model (RCM: ALARO) to allow simulations of the RCM with a fully dynamic land surface for the recent past and the period 2000-2030. In this contribution, we analyze the results of the first simulations performed with the CARAIB dynamic vegetation model over Belgium at a resolution of 1km. This analysis is performed at the species level, using a set of 17 species for natural vegetation (trees and grasses) and 10 crops, especially designed to represent the Belgian vegetation. The CARAIB model is forced with surface atmospheric variables derived from the monthly global CRU climatology or ALARO outputs (from a 4 km resolution simulation) for the recent past and the decennial projections. Evidently, these simulations lead to a first analysis of the impact of climate change on carbon stocks (e.g., biomass, soil carbon) and fluxes (e.g., gross and net primary productivities (GPP and NPP) and net ecosystem production (NEP)). The surface scheme is based on two land use/land cover databases, ECOPLAN for the Flemish region and, for the Walloon region, the COS-Wallonia database and the Belgian agricultural statistics for agricultural land. Land use and land cover are fixed through time (reference year: 2007) in these simulations, but a first attempt of coupling between CARAIB and CRAFTY will be made to establish dynamic land use change scenarios for the next decades. A simulation with variable land use would allow an analysis of land use change impacts not only on crop yields and the land carbon budget, but also on climate relevant parameters, such as surface albedo, roughness length and evapotranspiration towards a coupling with the RCM. [less ▲]

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See detailSources pour l’étude des transferts de cultes en Grèce antique
Palamidis, Alaya ULg

Conference (2016, April 20)

A couple of Greek inscriptions show that it was possible to transfer a cult, that is to no longer honour a deity in their original sanctuary, but in a new one founded on this occasion at a different ... [more ▼]

A couple of Greek inscriptions show that it was possible to transfer a cult, that is to no longer honour a deity in their original sanctuary, but in a new one founded on this occasion at a different location. However, they provide few elements to study this phenomenon. The contribution of literary sources is also very limited. Thus, the 1st century A.D. author Strabo mentions four cases of cult transfers, which, however, prove not to correspond to historical events. We should therefore turn to archaeological sources, and especially to the negative evidence: the absence of archaeological material testifying to the frequentation of a sanctuary while the cult of the deity is still attested by other sources provides the best clue to such transfers. On the contrary, there is positive evidence for the relocation of temples, which were entirely taken down and reconstructed elsewhere — the so-called «Wandering temples» — but the reuse of building materials does not imply the transfer of the cult. Further indications that a cult was transferred include coins or even the orientation of temples. [less ▲]

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See detailVolunteering Citizens in Nuclear Risk Governance: Citizen Science after Fukushima
Van Oudheusden, Michiel ULg; Turcanu, Catrinel; Yoshizawa, Go et al

Conference (2016, April 20)

Citizen science (CS) is a form of science developed and enacted by citizens, typically with citizen volunteers collecting and/or analyzing various kinds of data. Whereas common forms of CS like bird ... [more ▼]

Citizen science (CS) is a form of science developed and enacted by citizens, typically with citizen volunteers collecting and/or analyzing various kinds of data. Whereas common forms of CS like bird counting and amateur astronomy generally elicit interest and approval on behalf of scientists, decision makers, and publics at large, CS in the nuclear field is far more contentious. This is due to the controversial nature of nuclear science and technology, as evidenced by public disputes about nuclear energy, nuclear waste management, and nuclear accidents, among others. Starting from these observations, this paper probes the risky, disputed character of CS in nuclear emergency and post-accident situations. It specifically looks at CS in Japan after the 2011 Fukushima Daiichi nuclear disaster, where citizens in affected areas monitor radioactivity in the environment and communicate about health and environmental risks with one another (e.g. Citizens’ Radioactivity Monitoring Project). In these processes, citizen scientists voice ardent criticism of government, industry, and academia, as these institutes are seen to deliberately spread biased information to sustain an illusion of control (http://blog.safecast.org). By taking science and technology into their own hands, they challenge conventional notions of citizen engagement, science, and avocation/volunteerism. The paper draws on the notions of contentious politics and issue politics (e.g. Marres 2005) to highlight the issue-driven, adversarial and untamed character of post-Fukushima CS in the nuclear field. It is argued that these notions better capture what CS after Fukushima amounts to, as conventional representations (e.g. volunteer sensing, “citizens as sensors,” public participation in scientific research) downplay scientific uncertainties and power asymmetries between citizens and authorities, and do not account for how “Fukushima” is reconfiguring scientific citizenship in novel ways. [less ▲]

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See detailVers des systèmes d’information archéologique : maquette virtuelle et nuages de points intelligents
Billen, Roland ULg; Van Ruymbeke, Muriel ULg; Pfeiffer, Michelle et al

Conference (2016, April 20)

Detailed reference viewed: 31 (1 ULg)