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See detailLa totalité en science et en art
Dondero, Maria Giulia ULg

in Dondero, Maria Giulia; Beyaert-Geslin, Anne (Eds.) Arts et sciences. Approches sémiotiques et philosophiques des images (2014)

Mon étude vise à explorer la notion de totalité en sciences mathématiques et en art afin d’éclaircir le rôle de la perception dans les deux domaines. J’aborderai dans un premier temps la conception de ... [more ▼]

Mon étude vise à explorer la notion de totalité en sciences mathématiques et en art afin d’éclaircir le rôle de la perception dans les deux domaines. J’aborderai dans un premier temps la conception de démonstration visuelle en réfléchissant sur les notions d’hypoicône et de diagramme selon la philosophie mathématique de C.S. Peirce, pour ensuite tester ces notions dans un autre champ, celui des oeuvres d’art (peinture, sculpture, art environnemental). Si dans l’art comme dans les mathématiques, chaque trait appartenant à une configuration visuelle participe d’une totalité et doit occuper la bonne place pour que la totalité puisse fonctionner en tant que telle, la différence est que la totalité est démontable et répétable en mathématiques tandis que dans l’art pictural elle est normalement considérée comme définitive, unique et sacralisée a priori. Dans cet article j'étudie également de formes de totalité plus complexes (sculpture et art environnemental) où la totalité est à construire a posteriori. [less ▲]

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See detailComment les futurs enseignants du secondaire conçoivent-ils l’évaluation formative et ses difficultés de mise en œuvre ?
Goffin, Christelle ULg; Renson, Jean-Marie ULg; Fagnant, Annick ULg

Conference (2014, January)

Plusieurs études portant sur les conceptions relatives à l’évaluation montrent que la fonction formative de l’évaluation semble présente chez la plupart des enseignants du primaire et du secondaire ... [more ▼]

Plusieurs études portant sur les conceptions relatives à l’évaluation montrent que la fonction formative de l’évaluation semble présente chez la plupart des enseignants du primaire et du secondaire. L’étude présentée ici s’appuie sur une analyse de contenu réalisée auprès de 66 futurs enseignants qui se destinent au secondaire supérieur (grades 10-12) en Belgique francophone. Il leur a été demandé d’expliquer pourquoi il est considéré que l’évaluation fait partie intégrante de l’enseignement / apprentissage. Hormis un étudiant, tous font référence aux fonctions de diagnostic et / ou de régulation de l’évaluation. Mais seuls 11 étudiants mentionnent l’idée de régulation interactive. Enfin, une majorité d’étudiants anticipent des difficultés quant à la conception et la correction des évaluations, avec un pourcentage relativement plus élevé d’étudiants fréquentant une section littéraire (versus section scientifique). [less ▲]

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See detailPolitique budgétaire et décision politique: gérer un système fédéral complexe
Piron, Damien ULg

in Revue Nouvelle (2014), 69(1), 61-71

En Belgique, la décision politique repose depuis la fin du XIXème siècle sur le modèle consociatif: des compromis sont conclus entre les "piliers" issus des clivages philosophique et économique. L ... [more ▼]

En Belgique, la décision politique repose depuis la fin du XIXème siècle sur le modèle consociatif: des compromis sont conclus entre les "piliers" issus des clivages philosophique et économique. L'intégration européenne et la fédéralisation redessinent néanmoins cette méthode de gouvernement, ainsi que le montre la comparaison des politiques d'assainissement des finances publiques conduites par les gouvernements Dehaene Ier et Di Rupo. Le modèle fédéral engendre en effet une multiplication du nombre d'acteurs impliqués dans la prise de décision, ce qui complique l'élaboration de compromis. Il appartient donc aux acteurs politiques de maintenir le système belge gouvernable en imaginant des procédures adaptées à cette nouvelle réalité. [less ▲]

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See detailIsolation of an amylolytic chrysophyte, Poterioochromonas sp. from the digestive tract of the termite R. santonensis
Tarayre, Cédric ULg; Bauwens, Julien ULg; Brasseur, Catherine ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(1),

The aim of this work was the isolation and cultivation of amylolytic protists living in the digestive tract of the termite Reticulitermes santonensis (Feytaud). A chrysophyte identified as ... [more ▼]

The aim of this work was the isolation and cultivation of amylolytic protists living in the digestive tract of the termite Reticulitermes santonensis (Feytaud). A chrysophyte identified as Poterioochromonas sp. was isolated in a special medium containing rice grains as a source of carbon and nitrogen. Then, the protist was grown in a medium containing starch as a carbon source, tryptone, and a phosphate buffer at different pH values (5, 6 and 7). Yeast extract was added or not. Ciprofloxacin was used to avoid the bacterial development. Other antibiotics were also tested but showed an inhibitive effect on the growth of Poterioochromonas sp. Yeast extract allowed reaching 1.9 (pH 5), 2.3 (pH 6) and 2.2 (pH 7) times higher final cell concentrations, and 2.8 (pH 5), 2.8 (pH 6) and 2.2 (pH 7) times higher biomass yields. The starch concentration did not decrease in the medium until 3 and 4 days of culture, with and without yeast extract, respectively. Eight days of culture were necessary for hydrolyzing the starch completely, with and without yeast extract. Maltose and maltotriose were detected in the culture media and were hydrolyzed progressively. Maximal maltose concentrations were 0.68, 0.66 and 0.51 g.l-1 in the medium containing yeast extract. Maltotriose concentrations were only 0.17, 0.14 and 0.12 g.l-1. Other glucose oligomers were also detected but in lower quantities. It was determined that the protist developed a weak amylase activity, particularly at a weakly acidic pH (5-6). Such a pH also allowed a better growth of the protist. A maximal amylase activity of 112 nkat.l-1 was measured with yeast extract at pH 5. No other enzymatic activity (protease, cellulase or xylanase) was detected except amylase. The degradation products of starch which were obtained by enzymatic hydrolysis allow the identification of α-amylase, amyloglucosidase and possibly β-amylase activities. [less ▲]

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See detailImprove the characterization of tropical forests to improve management: policy brief
Gourlet-Fleury, Sylvie; Aleman, Julie; Bayol, Nicolas et al

Report (2014)

CoForChange has shown that management plans based on timber stock recovery are not enough to ensure the sustainability of these production forests. The variability of forest characteristics and their ... [more ▼]

CoForChange has shown that management plans based on timber stock recovery are not enough to ensure the sustainability of these production forests. The variability of forest characteristics and their different responses to disturbance should be considered in management decisions. [less ▲]

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See detailLa voix n'est pas infatigable
Tréger, Isabelle; Remacle, Angélique ULg

in L'Orthophoniste (2014), 335

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See detailAutomated analysis of background EEG and reactivity during therapeutic hypothermia in comatose patients after cardiac arrest
Noirhomme, Quentin ULg; Lehembre, Rémy; Lugo, Zulay et al

in Clinical EEG and Neuroscience : Official Journal of the EEG and Clinical Neuroscience Society (ENCS) (2014)

Visual analysis of electroencephalography (EEG) background and reactivity during therapeutic hypothermia provides important outcome information, but is time-consuming and not always consistent between ... [more ▼]

Visual analysis of electroencephalography (EEG) background and reactivity during therapeutic hypothermia provides important outcome information, but is time-consuming and not always consistent between reviewers. Automated EEG analysis may help quantify the brain damage. Forty-six comatose patients in therapeutic hypothermia, after cardiac arrest, were included in the study. EEG background was quantified with burst-suppression ratio (BSR) and approximate entropy, both used to monitor anesthesia. Reactivity was detected through change in the power spectrum of signal before and after stimulation. Automatic results obtained almost perfect agreement (discontinuity) to substantial agreement (background reactivity) with a visual score from EEG-certified neurologists. Burst-suppression ratio was more suited to distinguish continuous EEG background from burst-suppression than approximate entropy in this specific population. Automatic EEG background and reactivity measures were significantly related to good and poor outcome. We conclude that quantitative EEG measurements can provide promising information regarding current state of the patient and clinical outcome, but further work is needed before routine application in a clinical setting. [less ▲]

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See detailA review on simulation-based optimization methods applied to building performance analysis
Nguyen, Anh Tuan ULg; Reiter, Sigrid ULg; Rigo, Philippe ULg

in Applied Energy (2014), 113

Recent progress in computer science and stringent requirements of the design of “greener” buildings put forwards the research and applications of simulation-based optimization methods in the building ... [more ▼]

Recent progress in computer science and stringent requirements of the design of “greener” buildings put forwards the research and applications of simulation-based optimization methods in the building sector. This paper provides an overview on this subject, aiming at clarifying recent advances and outlining potential challenges and obstacles in building design optimization. Key discussions are focused on handling discontinuous multi-modal building optimization problems, the performance and selection of optimization algorithms, multi-objective optimization, the application of surrogate models, optimization under uncertainty and the propagation of optimization techniques into real-world design challenges. This paper also gives bibliographic information on the issues of simulation programs, optimization tools, efficiency of optimization methods, and trends in optimization studies. The review indicates that future researches should be oriented towards improving the efficiency of search techniques and approximation methods (surrogate models) for large-scale building optimization problems; and reducing time and effort for such activities. Further effort is also required to quantify the robustness in optimal solutions so as to improve building performance stability. [less ▲]

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See detailThe Breakthrough of Social Enterprise: Conceptual Clarifications
Defourny, Jacques ULg; Nyssens, Marthe

in Alix, Nicole; de Nanteuil, Matthieu (Eds.) For an Economy of Trust in Europe: the Contribution of the Social and Solidarity Economy (2014)

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See detailPrécis de droit pénal social
Kéfer, Fabienne ULg

Book published by Anthémis - 2è éd. (2014)

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See detailArrêt Essent c. Pays-Bas: l'interdiction absolue de privatisation à l'épreuve de la libre circulation des capitaux
Demoulin, Iris ULg; Sibony, Anne-Lise ULg

in Journal de Droit Européen [=JDE] (2014), 1

La prévention des conflits d’intérêts dans les industries de réseau peut rendre légitimes des mesures antiprivatisation. De telles mesures peuvent être justifiées par la poursuite d’objectifs d’intérêt ... [more ▼]

La prévention des conflits d’intérêts dans les industries de réseau peut rendre légitimes des mesures antiprivatisation. De telles mesures peuvent être justifiées par la poursuite d’objectifs d’intérêt général. [less ▲]

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See detailVascular Endothelial Growth Factor-111 (VEGF-111) and tendon healing: preliminary results in a rat model of tendon injury
Kaux, Jean-François ULg; Janssen, Lauriane ULg; Drion, Pierre ULg et al

in Muscle, Ligaments and Tendons Journal (2014), 1(5), 25-28

Tendon lesions are among the most frequent musculoskeletal pathologies. Vascular endothelial growth factor (VEGF) is known to regulate angiogenesis. VEGF-111, a biologically active and proteolysis ... [more ▼]

Tendon lesions are among the most frequent musculoskeletal pathologies. Vascular endothelial growth factor (VEGF) is known to regulate angiogenesis. VEGF-111, a biologically active and proteolysis-resistant splice variant of this family, was recently identified. This study aimed at evaluating whether VEGF-111 could have a therapeutic interest in tendon pathologies. Surgical section of one Achilles tendon of rats was performed before a local injection of either saline or VEGF-111. After 5, 15 and 30 days, the Achilles tendons of 10 rats of both groups were sampled and submitted to a biomechanical tensile test. The force necessary to induce tendon rupture was greater for tendons of the VEGF-111 group (p<0.05) while the section areas of the tendons were similar. The mechanical stress was similar at 5 and 15 days in the both groups but was improved for the VEGF-111 group at day 30 (p <0.001). No difference was observed in the mRNA expression of collagen III, tenomodulin and MMP-9. In conclusion, we observed that a local injection of VEGF-111 improves the early phases of the healing process of rat tendons after a surgical section. Further confirmatory experimentations are needed to consolidate our results. [less ▲]

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See detailCROSSROADS - magazine sonore des musiques noires US
Sacré, Robert ULg

Diverse speeche and writing (2014)

CROSSROADS : émission radio hebdomadaire diffusée sur EQUINOXE FM 100.1 (on line via www.equinoxefm.be) : tous les mercredis de 18 à 20h : contenu : blues,R&B,Soul, gospel, Zydeco, jazz

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See detailSciences humaines : Gestion des ressources environnementales : Etude de cas : le gaz de schiste
Claessens, Myriam; Lunskens, Virginie; Stevens, Xavier ULg

Learning material (2014)

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See detailWater soluble exo-polysaccharide from Syncephalastrum racemosum, a strong inducer of plant defence reactions
Valepyn, Emmanuel ULg; Cabrera, Juan-Carlos; Richel, Aurore ULg et al

in Carbohydrate Polymers (2014), 101

This study examines the production, characterization and bioactivity on plant cell cultured in vitro of exopolysaccharides (EPS) from Syncephalastrum racemosum CBS 443.59. Firstly, the influence of the ... [more ▼]

This study examines the production, characterization and bioactivity on plant cell cultured in vitro of exopolysaccharides (EPS) from Syncephalastrum racemosum CBS 443.59. Firstly, the influence of the fungus culture condition in shake flasks (pH, temperature and different carbon and nitrogen sources) on EPS and biomass production were evaluated. In order to enhance EPS production, a new protocol based on two-stage pH fermentation in a 3 L stirred fermentor was developed. Under this condition, EPS production increased by 3.55 times, compared to a constant pH process, reaching a maximal EPS concentration of 2.62 g/L. Structurally, the EPS contains a polyglucuronic acid backbone, linked essentially with mannose and fucose units and some galactose and glucose units. The bioactivity of EPS as inducer of defence reactions in plant suspension-cultured cells was also studied. Our results show, for first time, that EPS from S. racemosum CBS 443.59 induces, depending on the concentration, PAL activation and H2O2 synthesis in Arabidospsis thaliana cell suspensions. [less ▲]

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See detailEffects of limestone fillers on surface free energy and electrical conductivity of the interstitial solution of cement mixes
Courard, Luc ULg; Michel, Frédéric ULg; Perkowicz, Sylwia et al

in Cement and Concrete Composites (2014), 45

Most of concrete formulations actually contain mineral additives that are used as an inert filler or supplementary cementitious material (as type II addition). These materials are generally used in order ... [more ▼]

Most of concrete formulations actually contain mineral additives that are used as an inert filler or supplementary cementitious material (as type II addition). These materials are generally used in order to increase concrete performances both in its fresh and hardened states. The mineral additives usually improve the consistency and workability of fresh concrete and reduce the water demand for a required concrete slump because of an additional volume of fines. The way of action depends on the physical and chemical characteristics of fillers. The study of surface free energies and electric conductivities of interstitial solutions of cement mixes modified by blast furnace slags and limestone fillers contributes to a better knowledge of hardening and interaction process. [less ▲]

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