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See detailSize Matters, book-to-market does not! The F&F empirical CAPM revisited
Lambert, Marie ULg; Hübner, Georges ULg

Conference (2014, December 18)

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See detailDe l’intention au comportement physiquement actif chez les seniors : étude de l’influence des perceptions environnementales
Mouton, Alexandre ULg; Peels, Denise; Bolman, Catherine et al

Conference (2014, December 17)

The aim of this study was to analyse whether the perception of the local opportunities and the perception about the quality of the environment for physical activity (PA) mediate or moderate the intention ... [more ▼]

The aim of this study was to analyse whether the perception of the local opportunities and the perception about the quality of the environment for physical activity (PA) mediate or moderate the intention-behaviour relationship for PA in older adults. Data from two existing longitudinal studies (n = 149 and n = 1262) were used, assessing intention at baseline (T1), environmental variables at six months (T2) and PA behaviour at one year (T3). Results exposed a significant mediating role of the perception of the local PA opportunities (accounting for 15.5% in study 1 and 11.9% in study 2) and of the perception about the quality of the PA environment (accounting for respectively 19.6% and 18.2%) on the intention-behaviour relationship for PA. A moderation effect on the intention-behaviour relationship for PA was found in participants with a moderate perception of the local PA opportunities and in participants with a low or moderate perception about the quality of the environment for PA in both studies. This is the first longitudinal study that provides insight in the mediating and moderating role of environmental perceptions in the intention-behaviour relation for PA. Improving environmental perceptions could help future PA promotion interventions to bridge the intention-behaviour gap. [less ▲]

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See detailAllergie moléculaire & Diagnostic in-vitro, Optimalisation de la prescription
GADISSEUR, Romy ULg

Conference (2014, December 17)

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See detailComment conceptualiser les liens entre caractéristiques dépressives, processus psychologiques et niveau d'engagement dans des activités (activation versus évitement) ? Implications en psychologie clinique
Wagener, Aurélie ULg; Blairy, Sylvie ULg; Baeyens, Céline

Conference (2014, December 16)

Introduction : La dépression est caractérisée par une diminution du niveau d’activation comportementale (ACT) et par une augmentation du niveau d’évitement (EV). Selon les modèles théoriques de la dépres ... [more ▼]

Introduction : La dépression est caractérisée par une diminution du niveau d’activation comportementale (ACT) et par une augmentation du niveau d’évitement (EV). Selon les modèles théoriques de la dépres-sion, elle est également caractérisée par des biais dans six ensembles de processus psychologiques (PP): pensées négatives répétitives, stratégies de régulation émotionnelle, satisfaction environne-mentale, tendance à l’approche ou à l’inhibition, image de soi et clarté de l’identité. Cette étude a pour objectif de préciser l’influence des caractéristiques dépressives et des PP sur l’ACT et l’EV. Ces résultats seront intégrés au modèle élaboré par Kinderman en 2013 afin de construire un mo-dèle conceptuel de l’ensemble de ces liens, fondé empiriquement. Méthodologie : 477 adultes ( âge = 34, σ = 12), issus d’échantillons tout-venants ou fréquentant des services de psychiatrie, ont rempli une série de questionnaires évaluant plusieurs variables: données sociodé-mographiques, dépression, ACT, EV et les six ensembles de PP cités ci-dessus. Résultats : Le modèle testé via des analyses factorielles confirmatoires présente une adéquation raisonnable (RMSEA = 0,8). L’ACT est le plus influencée par des stratégies de régulation émotionnelle adap-tatives, des hauts niveaux de satisfaction environnementale et une image de soi positive. L’EV est le plus influencé par des pensées négatives répétitives, des stratégies de régulation émotionnelle non-adaptatives et de faibles niveaux de satisfaction environnementale. Conclusion : Les stratégies de régulation émotionnelle et la satisfaction environnementale sont les deux fac-teurs influençant le plus les niveaux d’ACT et celui d’EV. Les implications cliniques de ces résultats seront discutées. [less ▲]

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See detailHistoWeb - Toward a new learning ecology for histology
Vincke, Grégoire ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg et al

Conference (2014, December 16)

HistoWeb targets the transformation of the professional tool Cytomineinto a comprehensive and innovative teaching platform, valuing the notions of learning ecology and new learning dimensions seeking for ... [more ▼]

HistoWeb targets the transformation of the professional tool Cytomineinto a comprehensive and innovative teaching platform, valuing the notions of learning ecology and new learning dimensions seeking for lifelong competencies. The poster was released at the Digital Learning round table, organized by the European Commission around H2020 funding instruments and call 2 "ICT-20 Technologies for better human learning" [less ▲]

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See detailCorporate Board Attributes and Conditional Accounting Conservatism Evidence from French Firms
Boussaid, Nabila ULg; Sougné, Danielle ULg; Hamza, Taher

Conference (2014, December 16)

In this paper we investigate the relationship between boards of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model to evaluate this ... [more ▼]

In this paper we investigate the relationship between boards of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model to evaluate this relationship for the period 2009-2012, our empirical results can be summarized as follows. Firstly, greater board activity encourages more conservative reporting in financial statements. Secondly, greater board size diminishes conditional accounting conservatism. Lastly, there is a positive relationship between gender diversity and conservatism. To ensure robustness we have calculated our results usingalternative measures of accounting conservatism, namely time series and accrual-based measures in addition to asymmetric timeliness of earnings. These findings suggest that boards of directors’ attributes are an important factor in determining the financial reporting quality of French firms. [less ▲]

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See detailVieillissement réussi: quel lien avec la qualité de vie des personnes âgées?
Missotten, Pierre ULg; Dupuis, Gilles; Adam, Stéphane ULg

Conference (2014, December 16)

Introduction: Selon des théories du « bien vieillir », un sujet doit 1) vivre dans le présent et se focaliser sur des informations émotionnelles positives si il a un sentiment de finitude élevé (FTP)1 ; 2 ... [more ▼]

Introduction: Selon des théories du « bien vieillir », un sujet doit 1) vivre dans le présent et se focaliser sur des informations émotionnelles positives si il a un sentiment de finitude élevé (FTP)1 ; 2) sélectionner des tâches prioritaires (SOC-Sélection) pour les pratiquer plus (SOC-Optimisation) tout en modifiant ses manières de procéder (SOC-Compensation)2 ; 3) réajuster ses buts en tenant compte des limitations de l’environnement ou du self (Flexibilité) et non essayer de changer la situation existante (Ténacité)3. Si on peut penser que ces théories sont liées à la qualité de vie (qdv), aucune recherche empirique n’a testé ces liens. Méthodologie: Cette étude investigue dans quelle mesure les opérationnalisations de trois théories du vieillissement réussi (SOC, FTP, Flexibilité-Ténacité) sont bien liées à la qualité de vie (WHOQOL-OLD et ISQV-65+ bref©) de personnes âgées de plus de 65 ans vivant à domicile (n=61). Résultats: Un faible sentiment de finitude (FTP), une tendance à investir son énergie dans les buts importants (SOC-Optimisation), à chercher des alternatives (SOC-Compensation) et une bonne capacité de réajustement des buts (Flexibilité) constituent des indices liés à une meilleure Qdv (tous r>.30 mais <.70; p<.05). Conclusion: Le vieillissement réussi est bien lié à la qdv: les deux concepts sont différents mais complémentaires. En regard de la théorie FTP, il est toutefois nécessaire de déterminer si la mauvaise qdv des sujets ayant un sentiment de finitude élevé est causée par le fait de ne pas vivre dans le présent et de ne pas s’orienter vers des buts émotionnels. 1. Carstensen, L. (1995). Current Directions in Psychological Science, 4, 151-156. 2. Baltes & Baltes (1990). In P. B. Baltes & M. M. Baltes (Eds.), Successful aging: Perspectives from the behavioral sciences (pp. 1–34). New York: Cambridge University Press. 3. Brandtstädter, J. & Renner, G. (1990). Psychology and Aging 5 (1), 58–67. [less ▲]

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See detailLe genre Erythrophleum (Fabaceae) en Afrique, un modèle pour l’étude des mécanismes de différenciation de niches climatiques
Gorel, Anaïs ULg; Duminil, Jérôme; Doucet, Jean-Louis ULg et al

Conference (2014, December 16)

Comprendre l’origine des patrons de diversité est un défi en écologie des communautés et en écologie évolutive, notamment dans le contexte du futur changement climatique. Ce poster aura deux objectifs : i ... [more ▼]

Comprendre l’origine des patrons de diversité est un défi en écologie des communautés et en écologie évolutive, notamment dans le contexte du futur changement climatique. Ce poster aura deux objectifs : i) présenter pourquoi le genre Erythrophleum en Afrique est un modèle d’étude idéal à la compréhension des mécanismes de différenciation de niche et de spéciation au sein d’une lignée d’arbre en région tropicale; ii) mettre en lumière les démarches statistiques et expérimentales permettant de valider et de comprendre ces mécanismes. Le genre Erythrophleum, largement distribué en Afrique, est représenté par quatre espèces d’arbre : E. ivorense, E. suaveolens, E. africanum et E. lasianthum. Ces espèces morphologiquement très proches, présentent des aires de distribution géographiques et climatiques adjacentes. Elles sont distribuées de façon parapatrique sur un gradient pluviométrique, du plus humide pour E. ivorense ou plus sec pour E. lasianthum. Ce mode de distribution apparent, combiné à des données issues d’études phylogénétiques, suggère un rôle majeur des gradients climatiques comme pilotes des différenciations spécifiques du genre et pourrait donc confirmer l’hypothèse du gradient écologique (« The ecological gradient hypothesis » suppose que des gradients environnementaux peuvent induire des spéciations parapatriques sans que les populations ne soient isolées géographiquement. Néanmoins, des études sur les niches climatiques et leurs degrés de conservatisme sont indispensables pour valider cette hypothèse. Aujourd’hui, ces études sont rendues plus aisées grâce au développement de nouvelles techniques de modélisation des niches environnementales (Species Distribution Model ou SDM) et de tests statistiques de quantification du conservatisme/divergence de niche (voire Warren et al., 2008). En complément de la modélisation des niches observées (c.à.d. niches réalisées selon la définition de Hutchison (1957)), il est intéressant de comprendre les stratégies fonctionnelles sous-jacentes aux différenciations de niche. Les différenciations de niche au sein des espèces du genre sont probablement issues d’une distinction de leurs stratégies d’utilisation des ressources (lumière/eau) et de leurs différents positionnements au sein du slow-fast continuum (sensu Reich, 2014). Cette hypothèse peut être testée par la mise en place d’expériences en milieu contrôlé mesurant les réponses des individus à des stress environnementaux. [less ▲]

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See detailPersonnel soignant et âgisme: quelles conséquences cliniques ?
Schroyen, Sarah ULg; Missotten, Pierre ULg; JERUSALEM, Guy ULg et al

Conference (2014, December 16)

Introduction : Le cancer est un problème de santé majeur dont l’âge constitue un facteur de risque avéré1. Paradoxalement, les personnes âgées souffrant d’un cancer sont souvent exclues des essais ... [more ▼]

Introduction : Le cancer est un problème de santé majeur dont l’âge constitue un facteur de risque avéré1. Paradoxalement, les personnes âgées souffrant d’un cancer sont souvent exclues des essais cliniques et sous-traitées comparativement à des patients plus jeunes1. Un élément explicateur de ces constats est la stigmatisation liée à l’âge² (c.à.d. nos stéréotypes liés à l’âge, et donc l’âgisme). Méthodologie : Nous avons interrogé 76 infirmiers (-ères) travaillant en oncologie. A l’aide de fiches cli-niques, nous leur avons demandé s’ils encourageraient à des patients un traitement expérimental (40 vs 70 ans), une chimiothérapie ou une reconstruction mammaire (35, 55 ou 75 ans), tout paramètres cliniques étant équivalents par ailleurs. Résultats : L’encouragement d’un traitement expérimental est moins fréquente pour une personne de 70 ans comparativement à une personne de 40 ans (p<.001). De plus, le personnel soignant encourage moins fréquemment une chimiothérapie pour une personne de 75 ans comparativement aux per-sonnes de 55 et 35 ans (p<.001). Au niveau de la reconstruction mammaire, une différence est vi-sible dès 55 ans : la reconstruction mammaire est moins encouragée pour une personne de cet âge par rapport à une personne de 35 ans (p=.02) et encore moins encouragée pour une personne de 75 ans comparativement à une personne de 55 ans (p<.001). L’âge des infirmiers (M = 35.8) a une influence sur ces encouragement : plus ils sont âgés, plus ils encouragent le traitement chimiothérapeutique d’une per-sonne de 75 ans (p = .005) de même que le traitement expérimental pour une personne de 70 ans (p = .01). Conclusion : A l’instar d’autres études3, 4, nous confirmons que tant du point de vue esthétique que cura-tif, le personnel médical encourage moins fréquemment un traitement aux patients plus âgés compa-rativement aux plus jeunes. 1. Hurria, A., et al. (2012). J Natl Compr Canc Netw, 10, 162-209. 2. Penson, R. T., et al. (2004). The Oncologist, 9, 343-352. 3. Madan, A. K., et al. (2001). Acad Med, 76, 282-284. 4. Protière, C., et al. (2010). Crit Rev Oncol Hematol, 75, 138-150. [less ▲]

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See detailTiming pubertaire perçu et conduites à risque et déviantes à l’adolescence
Glowacz, Fabienne ULg

Conference (2014, December 15)

Le processus de maturation pubertaire a des répercussions sur la représentation de soi et sur l’établissement des relations sociales à l’adolescence. La poussée staturo-pondérale, comme l’atteinte de la ... [more ▼]

Le processus de maturation pubertaire a des répercussions sur la représentation de soi et sur l’établissement des relations sociales à l’adolescence. La poussée staturo-pondérale, comme l’atteinte de la maturité sexuelle, ne se produisent pas en même temps chez tous les adolescents. Cette variabilité interindividuelle a des effets au niveau de la construction identitaire, de la perception de soi et du rapport aux autres. Nos recherches se centrent sur les liens entre le timing pubertaire et l’engagement dans des comportements délictueux, usage de drogue, conduites sexuelles et autres comportements exploratoires et déviants. Notre recherche porte sur un échantillon de 316 adolescents âgés de 13 à 18 ans, et un échantillon de 47 adolescents ayant commis une agression sexuelle. L’estime de soi, l’agressivité, les relations aux pairs, les comportements sexuels, les conduites délinquantes et le timing pubertaire perçu (TPP) ont été évalués pour chaque sujet. Des analyses comparatives entre les types de TPP (avancé-retardé-normal) ont permis d’analyser l’impact de la perception par l’adolescent d’une désynchronisation de son timing pubertaire au niveau des dimensions étudiées et de l’adoption de conduites à risque et déviantes. Nos résultats montrent une surreprésentation de « pubertés» décalées (avancées ou retardées) chez les adolescents engagés dans des conduites à risques et des conduites déviantes au niveau de la sexualité. Ils seront discutés dans une perspective bio-psychosociale à partir des théories développementales. [less ▲]

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See detailMulti-wavelength observations of Jupiter's aurora coordinated with Hisaki and other space telescopes
Kimura, Tomoki; Badman, Sarah; Tao, Chihiro et al

Conference (2014, December 15)

From January to April 2014, two observing campaigns by multi-wavelength remote sensing from X-ray to radio were performed to uncover energy transport process in Jupiter’s plasma environment using space ... [more ▼]

From January to April 2014, two observing campaigns by multi-wavelength remote sensing from X-ray to radio were performed to uncover energy transport process in Jupiter’s plasma environment using space telescopes and ground-based facilities. These campaigns were triggered by the new Hisaki spacecraft launched in September 2013, which is an extremely ultraviolet (EUV) space telescope of JAXA designed for planetary observations. In the first campaign in January, Hubble Space Telescope (HST) made imaging of far ultraviolet (FUV) aurora with a high special resolution (0.08”) through two weeks while Hisaki continuously monitored aurora and plasma torus emissions in EUV wavelength with a high temporal resolution (1 min<). We discovered new magnetospheric activities from the campaign data: e.g., internally-driven type auroral brightening associated with hot plasma injection, and plasma and electromagnetic filed modulations in the inner magnetosphere externally driven by the solar wind modulation. The second campaign in April was performed by Chandra X-ray Observatory (CXO), XMM newton, and Suzaku satellite simultaneously with Hisaki. Relativistic auroral accelerations in the polar region and hot plasma in the inner magnetosphere were captured by the X-ray space telescopes simultaneously with EUV monitoring of aurora and plasma torus. Auroral intensity in EUV indicated a clear periodicity of 45 minutes whereas the periodicity was not evident in X-ray intensity although previous observations by CXO indicated clear 40-minute periodicity in the polar cap X-ray aurora. In this presentation, we show remarkable scientific results obtained these campaigns. [less ▲]

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See detailPerception du bien-être chez les étudiants de l’Université de Liège
Cloes, Marc ULg; Etienne, Anne-Marie ULg; Maslah, Olfa et al

Conference (2014, December 15)

This study is focused on the analysis of the wellness perception of a representative sample of students of the University of Liege. Findings confirm those of the literature as males at students who ... [more ▼]

This study is focused on the analysis of the wellness perception of a representative sample of students of the University of Liege. Findings confirm those of the literature as males at students who consider to be physically active have higher scores of wellness. The study reveals also that students who are still leaving with their parents have higher scores of wellness. [less ▲]

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See detailMarty and the 4th Logical Investigation: What is the disagreement really about?
Seron, Denis ULg

Conference (2014, December 13)

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See detailTuta absoluta (Lepidoptera: Gelechiidae) ability to localize and develop on wild and cultivated solanaceous plant species
Bawin, Thomas ULg; Dujeu, David ULg; Fagan, Maud ULg et al

Conference (2014, December 13)

The tomato leafminer, Tuta absoluta (Lepidoptera: Gelechiidae), is a widespread invasive species damaging economically important cultivated solanaceous crop plants, including tomatoes and potatoes. Little ... [more ▼]

The tomato leafminer, Tuta absoluta (Lepidoptera: Gelechiidae), is a widespread invasive species damaging economically important cultivated solanaceous crop plants, including tomatoes and potatoes. Little is known about the ability of this microlepidoptera to encounter and develop on alternative wild and agricultural plant species. These plants could provide refuges and have to be identified for more efficient integrated management strategies. In the present study, we assessed the ability of T. absoluta to develop on wild (Solanum nigrum, Atropa belladonna, Datura stramonium) and cultivated (Solanum tuberosum) solanaceous plant species under laboratory conditions. Fitness tests were performed in Petri dishes by isolating single individuals with excised leaf from one of the host plants. We found that Solanum species allowed higher larval survivability and shorter development time (from egg to adult emergency) compared to the other plants. Two choice behavioral assays performed in flying tunnels (S. tuberosum versus another plant) revealed that adult distribution and female oviposition did not differ between Solanum species, which were preferred to the other tested plants. These results appeared to be consistent with survival rates and development times. Because larval survivability depends on the female’s oviposition choice, the hypothesis that host plant choice is influenced by plant volatile organic compounds has to be tested. It can be concluded that Solanum species remain the more suitable hosts for T. absoluta development among the tested plants. Other plant species could be opportunistically colonized with little incidence but care should be taken in these results as genetic variability in insects and plants, as well as plant physiological state, might have an impact on the pest survivabilty. [less ▲]

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See detailNew technologies in conservation: monitoring African wildlife with UAS
Linchant, Julie ULg; Semeki, Jean; Lejeune, Philippe ULg et al

Conference (2014, December 13)

In the vast protected areas of Africa, traditional wildlife surveys performed by plane or foot are logistically difficult to implement due to the lack of means and appropriate materials. Moreover, the ... [more ▼]

In the vast protected areas of Africa, traditional wildlife surveys performed by plane or foot are logistically difficult to implement due to the lack of means and appropriate materials. Moreover, the possibilities of encountering poachers in the field pose a serious risk to the monitoring teams. Over the last decade, civilian UAS (Unmanned Aerial Systems) boomed in natural resource monitoring. One of the biggest challenges of the UAS is to replace traditional wildlife censuses for the application of wildlife conservation. Parameters have to be approached in a different way than before. We performed test flights in the open savannah of the Garamba National Park during the wet season using the Falcon Unmanned UAS. Both photos (Sony Nex7, 24Mp) and videos, including thermal infrared videos (Tamarisk 640x480), have been used. Flight altitude ranged from 50 to 200m and pictures showed that animals can be effectively detected at 100m. We spotted elephants, hippopotamus and buffaloes as well as other smaller species such as hartebeests, kobs and warthogs. Thermal videos gave medium quality results during the day due to the heat but performed well during the night. The limited range and endurance of the UAS suggest a rethink of the usual census protocols. We therefore tested new flight plans in a rosette shape to take advantage of the higher points in the park, with transects having the length of the maximal range. Twelve transects of 10km can be covered in half a day with pictures covering a 15.6km² area. Human activities could also be detected. Pictures showed areas burned by poachers and the thermal infrared camera allows the detection of fires from a high altitude. Future developments need to be investigated such as automatic detection to review the huge amount of data collected and statistical methods must be adapted to those challenging situations. [less ▲]

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See detailBelowground Chemical Ecology: The Case of Wireworms
Barsics, Fanny ULg; Delory, Benjamin ULg; Delaplace, Pierre ULg et al

Conference (2014, December 13)

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See detailFirst monitoring results of three straw bale buildings in Belgium
Evrard, Arnaud; Dubois, Samuel ULg; Louis, Arnaud et al

Conference (2014, December 13)

Straw bale use in buildings may be an interesting way to decrease our energy needs and our impact on environment. The present paper describes an experimental set up to monitor three straw bale buildings ... [more ▼]

Straw bale use in buildings may be an interesting way to decrease our energy needs and our impact on environment. The present paper describes an experimental set up to monitor three straw bale buildings recently built in Belgium. For each building, results on temperature and relative humidity, inside and outside, are analyzed, as well as internal evolution of temperature and humidity distribution in the walls. The first building is an office building where two finishing are compared. Measurements also provide additional data on CO2 levels and electric consumption. The two other buildings are dwellings where live one single family. In the first one, a wall in the bedroom and a retaining wall are analyzed. In the second one, a wall in the bedroom and a wall in the bathroom are analyzed. Their hygrothermal behavior is discussed based on simulation results obtained with WUFI Pro and WUFI Plus software. The criterion for the validation of wall behavior is based on water content distribution through the walls. The paper confirms the great potential of this type of building technology and helps to identify how to assess and validate their effective hygrothermal behavior. [less ▲]

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See detailLiquidity patterns on the US corporate bond market
Heck, Stéphanie ULg; Margaritis, Dimitri; Muller, Aline ULg

Conference (2014, December 13)

Liquidity commonality exists and empirical evidence (e.g. Lin et al., 2011) indicates that exposure to this common liquidity factor is priced in the cross-section of corporate bonds. The existence of ... [more ▼]

Liquidity commonality exists and empirical evidence (e.g. Lin et al., 2011) indicates that exposure to this common liquidity factor is priced in the cross-section of corporate bonds. The existence of commonality implies that part of a bond’s illiquidity is left as idiosyncratic. In this paper, we study how illiquidity components explain the cross-section of bond yields and how this relationship varies over time and across bond categories. We use a factor decomposition to break down total illiquidity into a common and an idiosyncratic component and analyze how yields relate differentially to each of these two components. We find that a bond’s idiosyncratic illiquidity is important, which might reflect informational asymmetries compounded by the lack of diversification in the institutional investors’ portfolios. Moreover, the relation between illiquidity and yield spreads appears to be negative during the recent crisis period. [less ▲]

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See detailBelgien- und Deutschlandbilder als Spiegel der ostbelgischen Nachkriegsgesellschaft
Brüll, Christoph ULg

Conference (2014, December 13)

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See detailColonization of a new habitat by copepods: An in situ experiment
Mascart, Thibaud ULg; Lepoint, Gilles ULg; Biondo, Renzo ULg et al

Conference (2014, December 12)

Colonization of new habitats by a biological community is conspicuous and this dynamic process is one of the architectural forces of the biogeographical distribution we know today. Within the meiofauna ... [more ▼]

Colonization of new habitats by a biological community is conspicuous and this dynamic process is one of the architectural forces of the biogeographical distribution we know today. Within the meiofauna (<1mm), copepods (Crustacea) have successfully adapted to nearly every ecosystem and heir colonization power of permanent habitats is therefore well-established. However, few studies tackled the colonization of new naturally occurring provisional habitats, which are of ecological interest since they are rich in organic material, structurally complex and devoted of native fauna. Hence, the present study investigated the copepod colonization of provisional macrophytodetritus (mainly composed of senescent leaves and drift macroalgae) accumulated on bare sand patches inside a Mediterranean Posidonia oceanica seagrass meadow. General motive of colonization such as food and shelter are well-defined. However, little is known regarding the mode of the colonization and source pool of the associated colonists. Here, an in situ experiment was deployed in order to understand the mode of copepod’s colonization to fauna deprived macrophytodetritus. The objectives were: (1) assessing the adjacent colonist’s source pool (i.e. sediment, water column or P. oceanica canopy), (2) investigating the speed of settlement and (3) quantifying the species composition of the colonizing copepods. In summary: (1) species from every source pool actively colonized the macrophytodetritus through the water column and through the sediment-macrophytodetritus interface. (2) The initial settlement occurred within the first 24 hours. (3) The species composition showed to be different than the source’s composition. After 24h, the composition was similar to 45% of the P. oceanica, 28% of the water column and 25% of the sediments. After 96h, the composition was similar to 24% of the P. oceanica, 13% of the water column and 10% of the sediments. Indicating an evolution towards a macrophytodetritus copepod specific community composed of a mixture of the adjacent habitats first colonizers. [less ▲]

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See detailPolyplex based on polycarbonate polymers for an efficient delivery of HDAC5 and HDAC7 siRNA
Frère, Antoine ULg; Evrard, Brigitte ULg; Mespouille, Laetitia et al

Conference (2014, December 12)

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See detailOpen Access, dream or reality for scholars: The ULg experience
Thirion, Paul ULg

Conference (2014, December 12)

Since the “serial price crisis”, no institution in the world has been able anymore to provide to scholars with the scientific literature they need. Although it was the first reason why the scientific ... [more ▼]

Since the “serial price crisis”, no institution in the world has been able anymore to provide to scholars with the scientific literature they need. Although it was the first reason why the scientific community developed Open Access initiatives, it’s absolutely not the only one. Nowadays, the awareness has become so large that many research players have put OA on the agenda (NIH, WHO, H2020, Wellcome Trust, FRS-FNRS…). The two main existing complementary ways will be described (Green and Gold) and Fools’ Gold will be denounced (unfair gold, hybrid journals, predatory journals). The University of Liege is one of the world leaders in OA with Green and Gold initiatives. What benefits can scholars expect from OA as authors and as readers on the basis of that experience? [less ▲]

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See detailMaintaining the coexistence of forest species of different shade tolerances with close-to-nature forestry
Ligot, Gauthier ULg; Philippe, Balandier

Conference (2014, December 12)

Continuous-cover forestry has the goal of relying on natural regeneration, and maintaining irregular stand structure and tree species mixture. However, maintaining mixture of species with different shade ... [more ▼]

Continuous-cover forestry has the goal of relying on natural regeneration, and maintaining irregular stand structure and tree species mixture. However, maintaining mixture of species with different shade tolerances appears arduous with such a silvicultural system. Successfully managing irregular and mixed forests, relying on natural processes, requires a strong knowledge of the ecology of natural regeneration. In theory, regeneration dynamics depends upon the amount of transmitted radiation: shade-tolerant species dominate the regeneration under closed canopies whereas less shade-tolerant species dominate the regeneration under partially open canopies. Nevertheless, it explains hardly the difficulties faced by forest managers to maintain the coexistence of species of different shade tolerances. The purpose of this research is to define light requirements of two species with contrasting shade tolerances (Fagus sylvatica L. and Quercus petraea (Matt.) Liebl.) and, next, determining how understory light can be controlled by forest managers. We find that, contrary to our expectations, the shade-tolerant species outgrow the less shade-tolerant species in all light conditions. We next examine the effects of canopy structure and composition on understory light availability with a model of light interception by heterogeneous canopies. Various silvicultural treatments are tested in order to provide favorable understory light conditions for natural regeneration. The results underline that creating favorable understory light conditions for natural regeneration can be achieved with various regeneration treatments. However, the adequate reduction of stand density depends upon the chosen silvicultural strategies. The outcomes of this study highlight that the control of understory light can be insufficient to maintain the coexistence of species of contrasting shade tolerance, and provide guidelines for the management of understory light in heterogeneous forests. [less ▲]

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See detailSeasonal sampling and stable isotopes use to delineate seagrass phytodetritus macrofauna trophic ecology: baseline variation or actual diet change?
Remy, François ULg; Mascart, Thibaud ULg; Dauby, Patrick ULg et al

Conference (2014, December 12)

In Mediterranean exported seagrass macrophytodetritus accumulations, a diverse (more than 130 species) and abundant (up to 4900 id.m-2) macrofauna assemblage is found alongside meiofauna, microalgae ... [more ▼]

In Mediterranean exported seagrass macrophytodetritus accumulations, a diverse (more than 130 species) and abundant (up to 4900 id.m-2) macrofauna assemblage is found alongside meiofauna, microalgae, fungi and bacteria. Macrophytodetritus are mainly composed of poorly digestible yet highly colonized material: the dead leaves of the very productive (300 to 2000 g dry wt m-2 yr-1) endemic seagrass Posidonia oceanica. A key role may be played by macrofauna, and more particularly by litter vagile macroinvertebrates (invertebrates > 500µm), in the degradation, enrichment and carbon transfer from P. oceanica to coastal food webs. Indeed, results of gut content observations of the most abundant species show that even if only a few of these species ingest a large proportion of P.oceanica dead leaves fragments, most of the others ingest a small but non-negligible part, suggesting a potential role of the whole community in the mechanical fragmentation of the dead leaves. Mediterranean exported macrophytodetritus accumulations are very dynamic habitats with very variable food availability, quality, and composition. Such an inconstant habitat may result in drastic modifications of the invertebrate community but also of its trophic structure and ecology. To test this hypothesis of influence of pulsed availability, quality and composition of food sources on the vagile macrofauna diet, we took seasonal samples in Calvi Bay (Corsica, 8°45’E; 42°35’N), at two sites between August 2011 and May 2012. Gut content observations and C/N/S stable isotope analysis of bulk tissues were conducted on both the macrofauna and their potential food sources. Significant seasonal and spatial differences of ingestion patterns of the most abundant species were emphasised as were differences of isotopic signatures. “SIAR” Bayesian mixing model and “SIBER” package were used to analyse isotopic data and determine if these differences were due to actual diet modifications or only to baselines isotopic composition variations. [less ▲]

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See detailThe cerato-mandibular ligament: an innovation for sound production and feeding in damselfishes (Pomacentridae).
Olivier, Damien ULg; Frederich, Bruno ULg; Spanopoulos-Zarco, Milton et al

Conference (2014, December 12)

The success of a taxonomic group can be promoted by a key character that allows the group to interact with its environment in a different way and to potentially occupy new niches. The Pomacentridae ... [more ▼]

The success of a taxonomic group can be promoted by a key character that allows the group to interact with its environment in a different way and to potentially occupy new niches. The Pomacentridae possess a synapomorphic trait, the cerato-mandibular (c-md) ligament, which joins the hyoid bar to the inner part of the lower jaw. It has previously been shown that this ligament is a key trait in communication in damselfishes because it enables them to slam the oral jaws shut causing teeth collision and sound production. This specific behavior of mouth closing could, however, also be used for other tasks, such as feeding. Many territorial damselfishes are referred to as farmers, due to their ability to manage algal crops on which they feed. This study hypothesizes that the c-md ligament provides an advantage for grazing filamentous algae, and should thus be considered a key trait for farming behavior. The kinematic patterns associated with sound production and biting filamentous algae or attached animal prey are all based on the same mechanism and are associated with a slam of the oral jaws. We observed that transection of the c-md ligaments makes the fish unable to perform such actions. This study shows that the c-md ligament is a key trait both for sound production and for grazing activities in damselfishes. The buccal jaw slam enables the fish to perform accurate strikes on small filamentous algae. This kind of bite probably plays a major role in farming activity and allows grazing damselfishes to occupy distinct niches, possibly increasing their competitive evolutionary success. [less ▲]

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See detailAnalphabétisme secondaire, raison cynique et la culture pour tous.
Hamers, Jérémy ULg

Conference (2014, December 12)

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See detailUmbilical hernia under local anaesthesia: tips and tricks
DETRY, Olivier ULg

Conference (2014, December 12)

Despite many studies confirming the feasibility and the interest of local anaesthesia for umbilical repair, its use is not generalized amongst the abdominal surgeons. The advantages of local anaesthesia ... [more ▼]

Despite many studies confirming the feasibility and the interest of local anaesthesia for umbilical repair, its use is not generalized amongst the abdominal surgeons. The advantages of local anaesthesia are indeed clear, including reduced costs, reduced hospital stay and reduced post operative pain. The success of the procedure depends on the skills and the motivation of the surgeon, of the nursing teams, and of the patient him/herself. The Mayo repair is ideally performed under local anaesthesia, but should be proposed to patients suffering from limited umbilical hernia with small defects. Prosthetic repairs might also be proposed under local anaesthesia, but large defects with rectus diastasis might require a full Rives/Stoppa repair in which local anaesthesia could not be sufficient. In obese patients, laparoscopic repair might be beneficial despite higher cost and longer hospital stay. Practically local anaesthesia requires some patience and quiet in the operative room. Operators should be aware that the action of local anaesthesia is delayed after injection. Local anaesthetics should be buffered and at body temperature at time of injection. Local anaesthetics containing Adrenalin allow longer pain control, with limitation of bleeding and less toxicity. Large and brutal movements should be avoided. Ligature and section of parts of greater omentum are feasible under local anaesthesia without patient discomfort. Tension free repair should be favoured, and during Mayo repair, the only painful part of the repair is often the closure of the defect with the different stiches. The surgical and anaesthetic techniques for umbilical hernia repair should be tailored to the specific characteristics of the umbilical hernia and of the patient. There is no method of choice that might fit for every patient. [less ▲]

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See detailNegations in Late Egyptian: the general trends. A functional and typological perspective
Winand, Jean ULg

Conference (2014, December 12)

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See detailCo-evolution of the parasitic fungi Pneumocystis and their Muridae rodent hosts in Southeast Asia
Latinne, Alice ULg; Bezé, François; Morand, Serge et al

Conference (2014, December 12)

Pneumocystis species are opportunistic and airborne-transmitted fungi that infect the lungs of numerous mammalian species. These highly diversified fungi are characterized by strong host specificity ... [more ▼]

Pneumocystis species are opportunistic and airborne-transmitted fungi that infect the lungs of numerous mammalian species. These highly diversified fungi are characterized by strong host specificity, probably associated with co-speciation. In this study, we investigate the Pneumocystis genetic diversity and infection rate in Muridae rodents of Southeast Asia in relation to environmental habitats. A total of 445 wild rodents belonging to 18 Southeast Asian Muridae species were tested for the presence of Pneumocystis in their lungs through PCR amplification of two Pneumocystis mitochondrial genes (mtLSU rRNA and mtSSU rRNA). Pneumocystis DNA was detected in 215 (48.3%) out of these 445 rodents. Eight highly divergent Pneumocystis lineages were retrieved in our phylogenetic tree. Three of these lineages correspond to the described species Pneumocystis murina (infecting Mus species), P. carinii (infecting Rattus species) and P. wakefieldiae (also infecting Rattus species). Three individuals belonging to Rattus norvegicus were found co-infected by both P. carinii and P. wakefieldiae. The five remaining lineages may correspond to several new undescribed Pneumocystis species and infect the lungs of Cannomys (lineage 1), Bandicota (lineage 2), Berylmys (lineage 3), Rattus (lineage 4) and Maxomys, Niviventer and Leopoldamys (lineage 5) Muridae genera. The congruence between phylogenies of Pneumocystis and their rodent hosts has been tested using co-phylogenetic analyses and the number of inferred co-speciation events is significantly greater than expected by chance. Rodent species, age and sex have no influence on the Pneumocystis infection rate among Muridae rodents but individuals trapped close to human settlements in patchy habitat were more likely infected by Pneumocystis parasites. [less ▲]

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See detailSymptômes neurologiques du bord latéral du pied et de la cheville
WANG, François-Charles ULg

Conference (2014, December 12)

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See detailLaïcité à la française : de la prétention universaliste à l'obsession identitaire
Jacquemain, Marc ULg

Conference (2014, December 11)

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même ... [more ▼]

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même structure narrative peut être retrouvé sous des formes débarrassée de leur racisme explicite dans des textes considérés comme "mainstream" au sein de la laïcité, en analysant un texte du Rappel. A partir de là, on tente de montrer que cette "dérivation conspirationniste" peut trouver des prises dans des formulations "progressistes" de la laîcité dès lors que ces formulations partent pour point de départ le point de vue à la fois holiste et idéaliste d'un "laos" toujours-dejà-là, comme chez Peña ruiz [less ▲]

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See detailLa communauté du ressentiment. Analyse d'une posture énonciative
Servais, Christine ULg

Conference (2014, December 10)

Cette communication propose de caractériser la posture énonciative des « nouveaux réactionnaires » en analysant la manière dont ils s’adressent à leurs destinataires en tant que communauté politique. Par ... [more ▼]

Cette communication propose de caractériser la posture énonciative des « nouveaux réactionnaires » en analysant la manière dont ils s’adressent à leurs destinataires en tant que communauté politique. Par conséquent, on n’y conduit pas une simple analyse des représentations, mais une analyse des postures énonciatives en termes d’adresse au récepteur, étant entendu que, en convoquant une référence, le discours convoque également le destinataire dans un monde, auquel et duquel celui-ci est appelé à répondre. C’est à caractériser cet « appel » au récepteur dans le discours des « nouveaux réactionnaires » que cette intervention est consacrée. [less ▲]

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See detailIntegrating phylogenetic and environmental niche models to explore speciation mechanisms in the Erythrophleum genus in tropical Africa
Gorel, Anaïs ULg; Fayolle, Adeline ULg; Doucet, Jean-Louis ULg et al

Conference (2014, December 10)

In the context of global climate change, it is of primary importance to understand the species response to climate (habitat tracking or adaptation). In this study we investigated the evolutionary history ... [more ▼]

In the context of global climate change, it is of primary importance to understand the species response to climate (habitat tracking or adaptation). In this study we investigated the evolutionary history of the climatic niche between and within closely related tropical tree species of the Erythrophleum genus (Fabaceae, Caesalpinioideae): E. ivorense, E. suaveolens and E. africanum. Two major hypotheses, the refuge theory and the ecological gradient hypothesis, have been developed to explain the current distribution of tree clades across tropical Africa. To identify the speciation mechanisms, we used a combination of geographic data and environmental factors to quantify the degree of niche conservatism (or divergence). We used two sets of distribution data for the purpose of this study. Species distribution data for the whole of tropical Africa were gathered from herbarium records. Distribution data of the two sister species E. ivorense and E. suaveolens assigned to genetic cluster were available for the lowland tropical forests of western and central Africa. Using a Species Distribution Model (SDM) approach based on MaxEnt algorithm, we tested for the environmental differences (BIOCLIM data) between species and genetic clusters within species. We developed SDMs for each of the three Erythrophleum species (over the whole range) and for each of the five genetic clusters. We quantified the niche overlap using new niche similarity metrics. At species level, the climatic niches differed significantly and overlapped only sligthly, suggesting a parapatric speciation along a climatic gradient. Within the two sister species, the niche of the parapatric central African clusters strongly overlapped, suggesting a secondary contact following the recolonization from different forest refugia. The west African cluster however showed contrasted climatic niches possibly due to either recent (< 100 yrs) climate change in west Africa, or ongoing differentiation on the dry part of the climatic gradient. [less ▲]

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See detailPlaidoyer pour une recherche-compagne
Havelange, Carl ULg

Conference (2014, December 10)

Detailed reference viewed: 16 (3 ULg)
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See detailSur quelques conditions médiatiques de la posture néo-réactionnaire
Durand, Pascal ULg

Conference (2014, December 10)

Ceux qu'il est convenu de rassembler sous l'étiquette sans doute trop extensible de « Nouveaux Réactionnaires » appartiennent pour la plupart à un système inséparablement journalistique et éditorial, dans ... [more ▼]

Ceux qu'il est convenu de rassembler sous l'étiquette sans doute trop extensible de « Nouveaux Réactionnaires » appartiennent pour la plupart à un système inséparablement journalistique et éditorial, dans lequel c’est avec une grande symétrie que se répondent et se rencontrent, d’un coté, des « intellectuels médiatiques », auteurs d’essais à rotation rapide leur garantissant de fortes couvertures de presse et un fort taux de présence dans les émissions de radio et de télévision et, de l’autre côté, des journalistes prolongeant leur propre activité par des recueils de chroniques ou des ouvrages sur des questions de politique ou de société. L’intersection de plus en plus forte de l’univers des médias, de l’univers de l’édition et de l’univers intellectuel est d’autant moins étrangère à ce courant de pensée et de discours que certains de ses représentants les plus visibles apparaissent à l’évidence comme les produits de cette intersection même. Les logiques à l’œuvre dans cette intersection sont bien connues : elles vont de l’emprise croissante de la télévision sur le champ journalistique à l’emprise à son tour croissante de ce champ sur l’univers de la production éditoriale et intellectuelle (comme encore sur les formes du débat et de la représentation politiques). L'objet de la présente communication est de mettre en évidence que la nouvelle parole pamphlétaire semble bien avoir trouvé, dans ce nouvel écosystème discursif dominé par le médium télévisuel et notamment les dispositifs du talk show, les conditions idéales à sa propre montée en force et à la propagation de ses effets. [less ▲]

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See detailBias-variance decomposition in Random Forests
Louppe, Gilles ULg

Conference (2014, December 09)

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See detailIdentifying the best technical trading rule: a .632 bootstrap approach.
Hambuckers, julien ULg; Heuchenne, Cédric ULg

Conference (2014, December 07)

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being ... [more ▼]

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being rarely available. We argue that this method makes a poor use of the available information and creates data mining possibilities. Instead, we introduce an alternative bootstrap approach, based on the .632 bootstrap principle. This method enables to build in-sample and out-of-sample bootstrap data sets that do not overlap and exhibit the same time dependencies. We illustrate our methodology on IBM and Microsoft daily stock prices, where we compare 11 trading rules specifications. For the data sets considered, two different filter rule specifications have the highest out-of-sample mean excess returns. However, all tested rules cannot beat a simple buy-and-hold strategy when trading at a daily frequency. [less ▲]

Detailed reference viewed: 48 (7 ULg)
See detailLa théorie des humeurs à l’aube de l’Europe vernaculaire
Valenti, Gianluca ULg

Conference (2014, December 05)

Detailed reference viewed: 4 (0 ULg)
See detailRegistres de la langue en néo-égyptien: le cas des Tomb Robberies
Winand, Jean ULg

Conference (2014, December 05)

Detailed reference viewed: 15 (0 ULg)
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See detailCan Electrical Resistivity Tomography offer us a dynamic view on what happens in the soil-plant continuum?
Garré, Sarah ULg

Conference (2014, December 05)

Root water and nutrient uptake and its relation to environmental factors is one of the least understood components in the terrestrial water balance and is of high importance for water resources management ... [more ▼]

Root water and nutrient uptake and its relation to environmental factors is one of the least understood components in the terrestrial water balance and is of high importance for water resources management, ecology and agriculture. As the processes in the soil-plant continuum are complex and inextricably intertwined, alternative, non-invasive measurement methods are necessary to unravel spatial and temporal dynamics of the system. Electrical resistivity tomography (ERT) has been proposed as a promising technique, since bulk resistivity maps and their temporal evolution may serve as a proxy for changes in soil moisture and pore water salinity, amongst others. However, the variables affecting the measured bulk electrical resistivity often change simultaneously in natural environments and not all influencing factors are yet well understood (e.g. influence of root biomass). Therefore, the method needs field-specific calibration. In addition to limitations due to signal-to-noise ratio and data inversion strategies, this implies that ERT still needs further development and research efforts for its use to characterize the soil-plant continuum. [less ▲]

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See detailScience at the fringe of the French colonial world: the circulation of Jean-André Peyssonnel’s treatises on medicine and the natural history of Guadeloupe
Vandersmissen, Jan ULg

Conference (2014, December 05)

Jean-André Peyssonnel, born in Marseille in 1694, was a physician who in 1720-1721 earned his spurs in the fight against the plague that ravaged his hometown. Fascinated by the sea and the work of ... [more ▼]

Jean-André Peyssonnel, born in Marseille in 1694, was a physician who in 1720-1721 earned his spurs in the fight against the plague that ravaged his hometown. Fascinated by the sea and the work of fishermen, he turned in following years to the study of marine life. While conducting observational research along the coasts of the Provence and North Africa, he found evidence of the animal nature of coral. This controversial claim caused a heated debate with Réaumur, who blocked his career plans in France. Out of necessity Peyssonnel was forced to accept the post of “Médecin du Roi” in Guadeloupe. In this remote outpost of the French colonial empire, Peyssonnel continued his scientific activities. He received orders to fight a local outburst of leprosy, which resulted in a comprehensive study on the disease. In addition, he produced dozens of treatises on the natural history of the French Antilles, including volcanic, oceanographic, botanical and zoological studies. This contribution tells the story of these remarkable documents which, on their way to the learned world in Europe, passed through many hands. Spread over several intellectual centres – London, Paris, Marseille, Rouen, Bordeaux, Angers – these manuscripts shed a unique light on the circulation of knowledge in a Republic of Sciences turning global. [less ▲]

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See detailL’impact de la réserve cognitive sur le fonctionnement exécutif au cours du vieillissement normal
Simon, Jessica ULg; Gilsoul, Jessica ULg; Collette, Fabienne ULg

Conference (2014, December 05)

Le vieillissement normal s’accompagne d’un dysfonctionnement exécutif important. Or, on sait aujourd’hui qu’il existe une forte variabilité interindividuelle quant aux effets du vieillissement sur la ... [more ▼]

Le vieillissement normal s’accompagne d’un dysfonctionnement exécutif important. Or, on sait aujourd’hui qu’il existe une forte variabilité interindividuelle quant aux effets du vieillissement sur la cognition. Selon l’hypothèse de la réserve cognitive (Stern, 2009), les individus qui auraient développé un haut niveau de réserve résisteraient mieux aux effets du vieillissement que des individus de plus faible réserve cognitive. Dans cette étude, nous avons voulu mesurer l’impact des facteurs de réserve cognitive sur le fonctionnement exécutif au cours du vieillissement normal. Nous avons recruté 59 participants âgés de 60 à 80 ans, sans trouble cognitif ni neurologique. Nous leur avons proposé 8 tâches cognitives évaluant le fonctionnement exécutif : des épreuves d’inhibition (test de Stroop, test de Hayling, subtest Incompatibilité de la TAP), de flexibilité (subtest Flexibilité de la TAP, épreuve d’alternance arithmétique « plus-moins ») et de mise à jour (subtest Lettre-Chiffre de la MEM III, mise à jour de consonnes et tâche de 2-back). De plus, nous leur avons demandé de compléter différents questionnaires évaluant quatre facteurs de réserve cognitive (niveau d’études, parcours professionnel, activité physique et activités de loisir). Nous avons réparti nos participants en deux groupes en fonction de leur niveau de réserve cognitive (faible et haute). Des analyses de t de student (p<0.05) montrent que les participants avec une haute réserve cognitive ont de meilleures performances au subtest de mise à jour des consonnes (p=0,05) ainsi que des résultats quasi significatif pour le score composite de mise à jour (p=0,06) et le subtest de mise de consonnes (p=0,06). Nous avons aussi évalué l’impact spécifique de chaque facteur de réserve cognitive sur les performances au moyen de régressions simples (p<0.05). Les données montrent que le niveau d’étude explique une part significative de la variance du score composite de mise à jour et aux subtests Flexibilité et Lettre-Chiffre ainsi qu’une part quasi significative de la variance au score de mise à jour de consonnes. L’activité professionnelle au cours de la vie explique une part quasi-significative de la variance pour le score de mise à jour (p=0,07) et pour le test de mise à jour de consonnes (p=0,07). Enfin, les activités de loisir, quant à elles, expliquent une part significative de la variance des performances à la tâche du 2-back et une part quasi-significative de la variance des performances au test de Hayling (p=0.06). En conclusion, il apparait que les sujets âgés avec un haut niveau de réserve cognitive montrent de meilleures capacités à certains tests exécutifs uniquement. De plus, nos données suggèrent que tous les aspects du fonctionnement exécutif ne sont pas impactés de façon similaire par les différents facteurs de réserve cognitive. [less ▲]

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See detailOutline of ULg chemical sensors applications for IAQ evaluation
Romain, Anne-Claude ULg

Conference (2014, December 04)

The arrival of the European and National laws* concerning the official labelling of building materials (CE marking) and the respect of concentration values for some compounds regulations in public ... [more ▼]

The arrival of the European and National laws* concerning the official labelling of building materials (CE marking) and the respect of concentration values for some compounds regulations in public buildings as for instance schools, the emergence of the Environmental Assessments of buildings (Breeam, HQE,…) beside the energy performance, as well as the awareness increase of the impact of indoor air quality on the wellness and health (ie ENVIE and Healthvent projects [1]) lead inevitably to the development of new sensing technologies related to the IAQ evaluation. Among the numerous existing measurement devices, electrochemical cells, NDIR and PID ones are the most encountered sensors on the market. The major uses are real time monitoring (CO2) and “friendly” handheld devices. Other applications are also studied in several research labs. Few years ago, the ULg research team investigated the interest of MOS chemical sensors arrays for IAQ evaluation. This presentation aims to review some of the results of those projects. A first is the fast and simple diagnosis of moulds on building materials. The identification of contaminated materials among uncontaminated ones was successful [2-4]. However, the low concentration of the MVOC markers compounds (below 10 µg/m³) and the complexity of the background (material emissions, and VOC content of the indoor air) curbed the use of MOS sensors. Specific preconcentrations have to be developed to improve the diagnosis. Nowadays, with the emergence of new sensing materials and new measurement principles (eg IMS-ion mobility spectrometry [5]), perspectives are again opened. Another project (HEMICPD, Belgian project “Horizontal evaluation method for the implementation of the Construction Products Directive”-Emissions to indoor air [6]) concerned the marking of building materials and one of the tasks was to test the sensors array principle to monitor the compounds emanation from different building material, during 28 days, in emission test chambers. Another goal was to investigate a classification of the materials including their odour level. The results on the use of sensors to evaluate the efficiency of “masking” products pulverised in wallpapers and to manage their use are also explained. [less ▲]

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See detailAdvances in proteomics for the FP7 Venomics project
Degueldre, Michel ULg; Quinton, Loïc ULg; De Pauw, Edwin ULg

Conference (2014, December 03)

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See detailLa régulation du marché du travail par les intermédiaires privés
Gérard, Julie ULg

Conference (2014, December 02)

Detailed reference viewed: 14 (2 ULg)
See detailL'âgisme
Marquet, Manon ULg; Schroyen, Sarah ULg

Conference (2014, December 01)

Detailed reference viewed: 14 (4 ULg)
See detailPhysisorbed poly(ethylene oxide) is a robust tether for AFM-based single-molecule force spectroscopy
Willet, Nicolas ULg; Lussis, Perrine ULg; Giamblanco, Nicoletta et al

Conference (2014, December 01)

Atomic force microscopy (AFM)-based single-molecule force spectroscopy is a prevalent tool for the exploration of individual (bio)molecules, providing exquisite information on many molecular-level ... [more ▼]

Atomic force microscopy (AFM)-based single-molecule force spectroscopy is a prevalent tool for the exploration of individual (bio)molecules, providing exquisite information on many molecular-level processes. For example, proteins, DNA, polysaccharides, supramolecular polymers and polyelectrolytes have been investigated, revealing details about the strength of intramolecular interactions, folding and unfolding pathways, mechanics, conformational changes, reactivity, kinetics, etc. For each particular system under investigation, the experimental design is a decisive phase that often involves a multistep chemical protocol, including grafting, derivatization, coupling, (de-)protection, and other functionalization reactions. Procedures of sample preparation are often complex and time-consuming. Hence, there is a need for new general platforms allowing for straightforward sample preparation adapted to single-molecule studies, i.e. a tight attachment to both the substrate and the tip, and a low density to favor single-molecule detection. We report here on the use of poly(ethylene oxide) (PEO) as a tether to probe various properties of individual molecules. The polymeric linker acts as a handle that stably binds to the AFM tip. The simple adsorption of poly(ethylene oxide) to the tip is versatile and provides an appropriate system configuration for the investigation of many different biological and synthetic molecular systems. To attest for this versatility and adequacy with advanced single-molecule investigation, we present different examples of PEO-mediated studies about the unfolding of a synthetic peptide, the mechanochemical behavior of a molecular machine and finally the stability of a metallo-supramolecular complexed polymer. All the requirements for the study of peptide conformation, tiny molecular machines or metallo-supramolecular interactions in solution are here fulfilled. More generally, this method based on non-covalent sorption of PEO on an AFM tip, can be implemented in a wide range of solvents, for the study of many intra- or intermolecular phenomena at the single-molecule level over orders of magnitude of force loading rates. Connecting PEO tethers to a very broad variety of (bio)molecules is a facile and versatile route. The commercial availability of many different functional PEOs makes this tethering strategy even more accessible. [less ▲]

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See detailAtmosphere - surface fluxes estimated from different measurement techniques over snow covered sea ice
Sørensen, L.L; Delille, Bruno ULg; Jensen, B. et al

Conference (2014, December)

Carbon dioxide flux measurements in ecosystem science are mostly conducted over terrestrial areas by eddy covariance technique or the closed chamber method. Both methods are becoming more frequently used ... [more ▼]

Carbon dioxide flux measurements in ecosystem science are mostly conducted over terrestrial areas by eddy covariance technique or the closed chamber method. Both methods are becoming more frequently used over ice and snow covered surfaces. Comparisons between eddy covariance and chamber methods have been carried out over terrestrial surfaces, but carefully designed inter calibration experiments over sea ice and snow are still needed to assess differences and uncertainties. Here we present one of the first comparisons of fluxes over snow covered sea ice estimated from the eddy covariance technique and the chamber method. The measurements were carried out at Young Sound in Northeast Greenland from May 28th to June 28th 2014 starting just before snow started to melt. The comparison shows in general higher fluxes obtained by the eddy covariance method however the disagreement varies depending on meteorological and surface parameters. The flux divergence in relation to varying parameters will be presented and possible causes will be discussed. [less ▲]

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See detailOral Abstract session: Stress echo in clinical practice: Friday 5 December 2014, 08:30-10:00Location: Agora.
Magne, J.; Donal, E.; Dulgheru, R. et al

Conference (2014, December)

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See detailTree species diversity effects on soil microbial biomass, diversity and activity across European forest types
Carnol, Monique ULg; Baeten, Lander; Bosman, Bernard ULg et al

Conference (2014, December)

Increasing tree species diversity in forests might contribute to ecosystem-service maintenance, as well as to the reconciliation of regulating, provisioning and supporting services within the frame of ... [more ▼]

Increasing tree species diversity in forests might contribute to ecosystem-service maintenance, as well as to the reconciliation of regulating, provisioning and supporting services within the frame of multifunctional and sustainable forestry. Individual tree species influence biogeochemical cycling through element deposition (throughfall, litterfall), and through microbial activities in the soil. Yet, the influence of mixing tree species on these ecosystem processes is unclear, in particular concerning the microbial diversity and activity in soils. Here we synthesize results from the Exploratory Platform of the FunDivEUROPE project (http://www.fundiveurope.eu/). This network of 209 comparative plots covering a tree diversity gradient of 1 to 5 tree species was established in existing mature forests in 6 European regions. These six focal regions represent a gradient of major European forest types from boreal to Mediterranean forests. We analysed the impact of tree species diversity and the role of other controlling factors on the metabolic diversity of soil bacteria (BIOLOG Ecoplate), soil microbial biomass (fumigation-extraction) and potential nitrification (shaken soil slurry) in the forest floor and the upper organo-mineral soil horizon. Mean values of microbial biomass carbon ranged from 240 (Poland) to 1762 (Germany) mg kg-1 in the forest floor and from 4197 (Italy) to 11207 (Finland) mg kg-1 in the upper organo-mineral horizon. Tree diversity and soil water content were important controlling factors. Statistical models predict microbial biomass to increase in both horizons by 7-8% with each step increase in tree diversity. Metabolic diversity of soil bacteria (% of substrates used) showed high variability both within and between sites. Further results analysed with mixed linear models will be presented and discussed. [less ▲]

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See detail“Negotiating the law: judges, families and court hearings in inheritance cases in Cotonou”
Andreetta, Sophie ULg

Conference (2014, December)

On 14 June 2004, Benin ratified a new Code on Persons and Family – regulating, amongst other things, inheritance matters. Over the last couple of years, the number of inheritance cases handled by state ... [more ▼]

On 14 June 2004, Benin ratified a new Code on Persons and Family – regulating, amongst other things, inheritance matters. Over the last couple of years, the number of inheritance cases handled by state courts has drastically increased in the capital city. How do people understand and use the law? While modern courts, like other public services, have been analyzed as part of everyday governance and the local state in West Africa, I on the other hand will focus on the ways in which the judiciary interprets and implements law. Within that context, hearings are a key moment of legal proceedings. How do litigants argue their cases? How do judges manage to settle inheritance quarrels? Using case studies of inheritance disputes and their litigation under the 2004 ‘Code on Persons and Family’, I try to understand how state laws are understood, utilized, and/or questioned in Cotonou. [less ▲]

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See detailQuasi-loss of nationality - policy recommendations
Wautelet, Patrick ULg; de Groot, Gérard-René

Conference (2014, December)

This presentation gives a summary of the policy recommendations which were drafted in the framework of the ILEC project on loss of nationality (http://www.ilecproject.eu/). The recommendations pertain to ... [more ▼]

This presentation gives a summary of the policy recommendations which were drafted in the framework of the ILEC project on loss of nationality (http://www.ilecproject.eu/). The recommendations pertain to the situation of 'quasi-loss', i.e. the situation in which a person who was assumed to possed a nationality, learns that he/she never has possessed that nationality. The recommendations were presented in a policy brief (available at www.ceps.eu/node/9871). They will be included in Guidelines. [less ▲]

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See detailLes intervenants psycho-sociaux face à l’homoparentalité: quels besoins et quels défis?
Scali, Thérèse ULg; D'Amore, Salvatore ULg

Conference (2014, December)

Les intervenants psycho-sociaux sont confrontés à une société changeante qui leur pose de nouveaux défis tant dans leur clinique que vis-à-vis des concepts théoriques auxquels ils se réfèrent. En ... [more ▼]

Les intervenants psycho-sociaux sont confrontés à une société changeante qui leur pose de nouveaux défis tant dans leur clinique que vis-à-vis des concepts théoriques auxquels ils se réfèrent. En particulier depuis 2006 en Belgique, le cadre législatif permet aux couples homosexuels l’accès à la parentalité. Ainsi, les psychologues de la santé sont aujourd’hui face à une réalité qui les interpelle et qui leur demande d’intervenir. Ces interventions sont nombreuses : travail clinique, psychoéducation, sensibilisation dans les écoles, conférences… Mais qu’en est-il réellement du contenu de ces interventions ? La présente recherche a investigué les attitudes des intervenants psycho-sociaux dans les plannings familiaux face à la thématique de l’homoparentalité. Une méthodologie d’investigation groupale (les focus groups) a été utilisée (Kitzinger, Markova & Kalampalikis, 2004). A travers 6 focus groups composés de 4 à 8 participants, des psychologues, médecins, assistants sociaux et juristes ont été amenés à discuter cette question de santé publique à travers l’analyse de leurs pratiques quotidiennes. Les résultats ont mis en évidence trois niveaux : la réalité de terrain des intervenants avec leurs expériences et leurs ressentis, leurs questionnements concrets liés à la méconnaissance du vécu des familles homoparentales, et leurs besoins en termes d’outils. Ces résultats pourront aider à promouvoir la santé et la qualité de vie des personnes homosexuelles en favorisant la compréhension des réactions des professionnels hétérosexuels auxquels ils sont confrontés. [less ▲]

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See detailEcology of 20 trace elements in Mytilus galloprovincialis
Richir, Jonathan ULg; Lepoint, Gilles ULg; Lejeune, Pierre et al

Conference (2014, December)

Trace elements (TEs) are considered as non-degradable pollutants. This persistent character can alter their natural biogeochemical balance in contaminated environments. TEs are further toxic for aquatic ... [more ▼]

Trace elements (TEs) are considered as non-degradable pollutants. This persistent character can alter their natural biogeochemical balance in contaminated environments. TEs are further toxic for aquatic organisms from threshold levels and are thus likely to cause multiple damages to the population, the community and the ecosystem levels. For these reasons, their environmental occurrence has to be accurately monitored. The main interest of the use of quantitative sentinel organisms to this end, or bioindicator species, is their capacity to give information on the bioavailability of environmental contaminants. Mussels from the genus Mytilus are particularly well suited organisms for the monitoring of the coastal contamination. Native wild and cultured Mytilus galloprovincialis Lamarck, 1819 have been widely used since around 40 years to this purpose along coasts of the eastern Atlantic and the Mediterranean. But the accurate use of a bioindicator relies on the detailed knowledge of its ecophysiology and the influence of environmental variables on the bioaccumulation processes. In the framework of the STARECAPMED project, the ecology of 20 TEs in M. galloprovincialis is therefore investigated. The mussel morphometry and biology firstly define the TE accumulation processes. Accumulated TE are internally regulated and redistributed between body compartments; these internal processes notably depend on the essential or non-essential character of TEs. As filter feeder, mussels accumulate soluble and suspended TEs whose environmental levels are determined by the geomorphology, the physico-chemistry and the hydrology of monitored coastal meadows. All these factors are acting together to modulate the TE accumulation processes in mussels. TE bioaccumulated levels further balance quickly when any physiological or environmental changes occur in order to reach a new steady-state with environmental TE loads. The ecology of TEs in M. galloprovincialis is thus complex and very dynamic; these considerations must be taken into account when monitoring the chemical contamination of coastal meadows. [less ▲]

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See detailComparative morphology of cephalic cartilage and statocysts of Mediterranean cephalopods using magnetic resonance imaging (MRI)
Gillet, Amandine ULg; Solé, Marta; Jauniaux, Thierry et al

Conference (2014, December)

Organs responsible for equilibrium of cephalopods, the statocysts, possess numerous similarities with the vestibular systems of vertebrates. The statocysts are embebbed in the cephalic cartilage ... [more ▼]

Organs responsible for equilibrium of cephalopods, the statocysts, possess numerous similarities with the vestibular systems of vertebrates. The statocysts are embebbed in the cephalic cartilage protecting the brain. Although statocysts have been largely described, few studies focused on the cephalic cartilage and its morphology. The aim of this study is to describe the morphology of both statocysts and cartilage, to compare them between different species and to determine which are the parameters influencing their morphology. For species of Decapodiformes (Sepia officinalis, Sepiola rondeletii, Loligo vulgaris and Illex coindetii) and two species of Octopodiformes (Octopus vulgaris and Eledone cirrhosa) have been studied. Cephalic cartilages from these species have been scanned by magnetic resonance imaging (MRI) and volumes and linear measurements have been taken on the 3 dimension reconstructed models of the cartilages and statocysts. Results show that Octopodiformes possess a globular cartilage which surrounds almost totally the brain. On the other hand Decapodiformes posses a cartilage with bigger lateral and anterior foramens and then surrounds a smaller part of the brain. The morphology of the statocysts also varies between the two superorders. The statocysts of Octopodiformes are divided into two parts: endolymph and perilymph while those of Decapodiformes aren’t. These morphological variations between the two groups might be related to their ecology. Eledone cirrhosa and Octopus vulgaris are typically benthic species and then might receive shocks more often than Decapodiformes that possess a more pelagic lifestyle. Octopodiformes might then need a better protection for their brain than Decapodiformes. [less ▲]

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See detailFungal lipase production by solid-state fermentation
Ramos-Sanchez, L.B.; Julian-Ricardo, M.C.; Cordova, J. et al

Conference (2014, December)

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See detailAthanase Kircher ou l’Oedipe des Temps modernes
Winand, Jean ULg

Conference (2014, November 29)

Detailed reference viewed: 14 (1 ULg)
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See detailThe Beginning of UP in Northern Mongolia: New Results and Perspectives from the Open-air Site of Tolbor 16
Zwyns, N.; Bolorbat, T.; Flas, Damien ULg et al

Conference (2014, November 28)

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See detailGuidance chez les professionnels de la voix
Remacle, Angélique ULg

Conference (2014, November 28)

Cet atelier s’intéresse aux locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. Outre la ... [more ▼]

Cet atelier s’intéresse aux locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. Outre la présentation de pistes relatives à la prévention et la prise en charge de cette population, l’atelier comporte des manipulations d'accumulateurs vocaux, y compris l'utilisation du feedback tactile dans le but de modifier le comportement vocal (contrôle de la fréquence et du niveau de pression sonore de la voix). Des moyens permettant de réduire la charge vocale et le bruit environnant sont également présentés et manipulés : système d’amplification vocale et traqueur de bruit. [less ▲]

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See detailQuels modèles pour soutenir la prévention et la promotion de la santé ?
Vanmeerbeek, Marc ULg; Mathonet, Julien; Miermans, Marie-Christine ULg et al

Conference (2014, November 28)

Contexte et objectifs La prévention n’atteint pas souvent son objectif d’accès universel aux soins préventifs. Les modèles opérationnels publiés concernant la prévention et la promotion de la santé en ... [more ▼]

Contexte et objectifs La prévention n’atteint pas souvent son objectif d’accès universel aux soins préventifs. Les modèles opérationnels publiés concernant la prévention et la promotion de la santé en soins primaires ont été recherchés pour réaliser un inventaire fonctionnel et formuler des hypothèses de travail sur l’efficacité et l’équité de la prévention. Méthode Revue narrative de littérature utilisant les mots-clés relatifs aux différents niveaux de prévention, à la promotion de la santé, aux soins primaires, aux modèles de pratique et à la délivrance de soins. Une analyse multicritères a été utilisée. Principaux résultats Douze modèles ont été sélectionnés. Les modèles dont les auteurs annoncent qu’ils s’appliquent à la prévention décrivent majoritairement des approches centrées sur les individus dans le cadre de la relation médecin-patient, prenant en compte l’organisation de pratique. Certains modèles systémiques de type socio-écologique illustrent le concept de promotion de la santé : pratique éducative, ciblage sur des groupes ou des populations, prise en compte des milieux de vie et des déterminants sociaux de la santé. La place des patients dans l’élaboration des modèles est mineure, à l’image de leur implication comme acteurs dans les systèmes de soins. Les définitions des termes de prévention, promotion de la santé et éducation du patient diffèrent considérablement d’un modèle à l’autre. Discussion et conclusion Certains éléments valorisés par la promotion de la santé seraient intégrables aux pratiques de soins : empowerment individuel des patients, prise en compte de leurs milieux de vie ; participation accrue à des réseaux locaux de professionnels de la santé ; intégration, au sein des mêmes structures, de l’approche individuelle et collective pour permettre la poursuite simultanée des objectifs de personnalisation, d’efficacité et d’équité. Ces évolutions ont des implications sur la formation des soignants, en termes d’aptitudes communicationnelles, de sensibilisation aux concepts de la santé publique et d’immersion précoce des futurs soignants dans la communauté. [less ▲]

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See detailLes accumulateurs de voix
Remacle, Angélique ULg

Conference (2014, November 28)

Les troubles de la voix peuvent être engendrés tant par un malmenage que par un surmenage vocal. Tandis que le malmenage est causé par un geste vocal inadéquat, le surmenage résulte d’une charge vocale ... [more ▼]

Les troubles de la voix peuvent être engendrés tant par un malmenage que par un surmenage vocal. Tandis que le malmenage est causé par un geste vocal inadéquat, le surmenage résulte d’une charge vocale supérieure aux capacités de récupération du locuteur. La charge dépend principalement de la quantité de phonation en termes de durée, de fréquence fondamentale et de niveau de pression sonore de la voix. Ainsi, parler longtemps, fort et avec une voix aigüe peut mener au surmenage, principalement lorsque les conditions environnementales sont défavorables (mauvaise acoustique, bruit ambiant élevé, atmosphère sèche, etc). Depuis quelques années, des systèmes portables de quantification de la charge vocale sont commercialisés. Ces accumulateurs (ou dosimètres) objectivent le comportement vocal en situation réelle pendant une durée prolongée. Ils permettent de déterminer les moments auxquels le sujet parle, la durée de phonation, la fréquence fondamentale et le niveau de pression sonore de la voix. Certains modèles fournissent également des mesures du bruit environnant. Actuellement, les accumulateurs sont principalement utilisés chez les locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. La dosimétrie vocale permet de cibler les comportements vocaux à risque en contexte écologique ainsi que les situations favorisant la dysphonie. L’objectif des recherches utilisant ces outils est de proposer des lignes de conduites pour la prévention, l’évaluation et le traitement de la dysphonie, principalement chez les personnes ayant un usage vocal intensif. Aussi, ces recherches tentent d’établir des normes relatives à l’utilisation vocale journalière de différents groupes d’individus. En rééducation, les accumulateurs de voix peuvent également fournir un feedback vibratoire en temps réel lorsque des seuils d’intensité ou de fréquence, prédéfinis par l’expérimentateur avant l’usage, sont dépassés par le locuteur. [less ▲]

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See detailHow light and occupational therapy intervention could fight some psychogeriatric symptoms
Maggi, Patrick ULg; Bassain, Fatima; Gosset, Christiane ULg et al

Conference (2014, November 27)

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in ... [more ▼]

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in older people. Since the beginning of June 2014 the Walloon Government has been financing a project which consists of a non-pharmacological approach that combines light and occupational therapy for a psychogeriatric population with specific symptoms: spatial and temporal disorientations, apathy, depression, agitation, anxiety, confusion and circadian disorder. The objective of this abstract is to expose the assumptions that the combination of two different light devices and one specific occupational therapy program could have an impact on the different symptoms of a psychogeriatric population. Methods: To build our hypothesis, two literature reviews have been achieved. The first one concerning the use of light as therapy gathered 30 studies while the other one about occupational therapy activities collected 35 articles. Results: Despite of a heterogeneity between studies dealing with light and occupational therapy, the combination of these two non-pharmacological interventions might fight the depressive syndrome, reduce the temporal disorientation thanks to a regularity in the period of activity, restore the circadian rhythm and so reduce some troubles that can be linked to them: sleep disorder, risk of fall, apathy, agitation, behavioural and cognitive troubles (attention, concentration). Moreover, one of the two light devices used which can modulate the light intensity according to the rooms might reduce the spatial disorientation if it’s employed as a landmark. Conclusions: Based on literature reviews and our experience into this field it’s seems that a non-pharmacological approach involving light and occupational therapy intervention could have a positive effect on symptoms of psychogeriatric population. In admitting that those effects are becoming true after experimentation and analyses, we can also expect an improvement of the quality of life. [less ▲]

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See detailL’animation théâtrale comme présence sociale
Brahy, Rachel ULg

Conference (2014, November 27)

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See detailPPP in the field of employment: clandestine strategies to become an efficient PPP?
Remy, Céline ULg

Conference (2014, November 27)

In this article, we study the Public-Private Partnerships (PPP) in the field of employment, in Belgium. These PPPs are established between Public Employment Service (PES) and private operators to create ... [more ▼]

In this article, we study the Public-Private Partnerships (PPP) in the field of employment, in Belgium. These PPPs are established between Public Employment Service (PES) and private operators to create projects for support and training for jobseekers the ultimate goal of which is social and professional reintegration. There are three critical moments in the life of the partnership: getting a partnership agreement with the PES, mobilizing jobseekers to participate in the delivery, and evaluating the outcomes achieved by the operator. The parties affected by these three critical steps are mainly the private operators. To overcome these difficulties, the providers implement informal and "clandestine" strategies to ensure the proper operation of the partnership and especially its performance and sustainability. [less ▲]

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See detailDiscussant Panel on "Public-Private Partnerships: New Governance Arrangements"
Remy, Céline ULg

Conference (2014, November 27)

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See detailLa sociologie par la littérature : une approche transdisciplinaire
Ledent, David ULg

Conference (2014, November 27)

Detailed reference viewed: 16 (2 ULg)
See detailAllergies alimentaires
GADISSEUR, Romy ULg

Conference (2014, November 26)

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See detailGuides d'architecture moderne et contemporaine en Wallonie et à Bruxelles
Charlier, Sébastien ULg; Moor, Thomas

Conference (2014, November 25)

Detailed reference viewed: 32 (4 ULg)
See detailProgramming self assembly by designing the 3D shape of floating objects
Poty, Martin ULg; Lagubeau, Guillaume ULg; Lumay, Geoffroy ULg et al

Conference (2014, November 25)

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, milimeter scale objets are produced ... [more ▼]

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, milimeter scale objets are produced. Their 3d shape is chosen in order to create capillary multipoles. The capillary interactions between these components can be either attractive or repulsive depending on the interface local deformations along the liquid-air interface. In order to understand how the shape of an object deforms the interface, we developed an original profilometry method. The measurements show that specific structures can be programmed by selecting the 3d branched shapes. [less ▲]

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See detailPENSANDO LA CIUDAD SOSTENIBLE MÁS ALLÁ DE LA DICOTOMÍA ECOLOGÍA URBANA Y MEDIOAMBIENTE URBANO: EL CASO DE LA GOBERNANZA DEL AGUA EN COCHABAMBA
Cabrera Quispe, Juan Edson ULg; Farah, Jihad ULg

Conference (2014, November 24)

In this article, we go back on two ways of taking into account the environmental dimension in urban planning and governance. We stress the difficult articulation between these two approaches – “urban ... [more ▼]

In this article, we go back on two ways of taking into account the environmental dimension in urban planning and governance. We stress the difficult articulation between these two approaches – “urban ecology” and “urban environment” – and the actual impasse the discipline of urban planning finds itself in in its quest of the sustainable city. These two approaches for acting on the city by considering the complexity of its milieu build on different representations of this milieu and different modes of action legitimation. Negating each other, they can difficultly coexist, even less articulate. Through the example of water management in Cochabamba, we stress the tensions between these approaches. We point also to the awkward and marginalized position of urban planning and challenges it must face to regain a capacity of action in contemporary fragmented cities that know complex governance landscapes and rare or endangered resources. [less ▲]

Detailed reference viewed: 51 (1 ULg)