References of "Scientific congresses and symposiums"
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See detailHuman cortical excitability depends on time spent awake and circadian phase
Ly, Julien ULg; Chellappa, Sarah Laxhmi ULg; Gaggioni, Giulia ULg et al

Conference (2014, September 17)

At any point in time, human performance results from the interaction of two main factors: a circadian signal varying with the time of the day and the sleep need accrued throughout the preceding waking ... [more ▼]

At any point in time, human performance results from the interaction of two main factors: a circadian signal varying with the time of the day and the sleep need accrued throughout the preceding waking period. But what’s happen at the cortical cerebral level? We used a novel technique coupling transcranial magnetic stimulation with electroencephalography (TMS/EEG) to assess the influence of time spent awake and circadian phasis on human cortical excitability. Twenty-two healthy young men underwent 8 TMS/EEG sessions during a 28 hour sleep deprivation protocole. We found that cortical excitability depends on both time spent awake and circadian phasis. [less ▲]

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See detailAutomatic artifact detection for whole-night polysomnographic sleep recordings
Coppieters't Wallant, Dorothée ULg; Chellappa, Sarah Laxhmi ULg; Gaggioni, Giulia ULg et al

Poster (2014, September 17)

Detecting of bad channels and artifacts for whole-night polysomnographic recordings is very time consuming and tedious. We therefore developed an automatic procedure to automatize this job.

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See detailLes effets de la retraite sur la mémoire
Adam, Stéphane ULg

Conference (2014, September 16)

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See detailScriptorium, a retro-cataloguing tool to easily and quickly encode older book items
Renaville, François ULg; Danhieux, Sylvain ULg

Conference (2014, September 16)

The University of Liège Library's books collection is composed of some 2,000,000 print volumes, of which only 60% are catalogued. Most of the uncatalogued books have been published before 1970 and ... [more ▼]

The University of Liège Library's books collection is composed of some 2,000,000 print volumes, of which only 60% are catalogued. Most of the uncatalogued books have been published before 1970 and cataloguing these according usual standards and norms would certainly take decades. To decrease the cost of treatments and increase the number of catalogued volumes, the Library developed a light PHP/MySQL application, Scriptorium, that enables non-catalogers (mostly students) to quickly encode the books (ca 3 min. per item) by providing the most essential information. References are then daily exported in MarcXML to the ILS. Scriptorium has been developed to permit to easily create new independent instances for different parallel retro-cataloguing projects and also to be used by other libraries. [less ▲]

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See detailMémoire épisodique et vieillissement normal : L'effet de la manipulation de la facilité de traitement perceptif en reconnaissance
Bastin, Christine ULg; Willems, Sylvie ULg

Poster (2014, September 16)

Etant donné que le vieillissement normal s’accompagne d’un déclin de la recollection tandis que la familiarité reste préservée, les tâches mnésiques facilitant l’utilisation de la familiarité ... [more ▼]

Etant donné que le vieillissement normal s’accompagne d’un déclin de la recollection tandis que la familiarité reste préservée, les tâches mnésiques facilitant l’utilisation de la familiarité permettraient de réduire les différences liées à l’âge en mémoire épisodique. Cette étude a évalué deux questions : 1) L’utilisation de la familiarité en reconnaissance peut-elle être favorisée en augmentant la différence de facilité de traitement perceptif (fluence) entre les items étudiés et les nouveaux items ? ; 2) Cette manipulation permet-elle de réduire l’effet de l’âge ? Deux tâches de reconnaissance ont été proposées à 24 participants jeunes et 24 participants âgés. Dans une tâche « sans recouvrement », les mots cibles et les mots nouveaux ne possédaient aucune lettre commune. L’exposition préalable aux mots cibles induisait donc une fluence sur les mots, mais également sur les lettres de sorte que la différence de fluence devenait un indice saillant et fiable pour distinguer cibles et distracteurs. Dans une tâche « avec recouvrement », les mots cibles et les mots nouveaux contenaient des lettres communes. Les résultats ont répliqué l’effet de l’âge sur la recollection (réponses Remember), avec préservation de la familiarité (réponses Know). Par ailleurs, nous observons 1) une amélioration de la discrimination dans la tâche « sans recouvrement », avec un plus grand nombre de reconnaissances correctes et moins de fausses reconnaissances (les deux basés sur la familiarité). De plus, 2) les différences liées à l’âge dans la capacité à discriminer cibles et distracteurs (reconnaissances correctes - fausses reconnaissances) étaient significativement réduites dans la tâche sans recouvrement par rapport à la tâche avec recouvrement. Ces données suggèrent que minimiser la similarité perceptive entre les mots cibles et les mots distracteurs, et donc augmenter la fluence, permet de réduire les différences liées à l’âge en reconnaissance en facilitant l’utilisation de la familiarité. [less ▲]

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See detailSFX Knowledge Base Advisory Board (KBAB): goals and achievements after one year
Renaville, François ULg; Needleman, Mark

Conference (2014, September 16)

Founded in 2013 as a result of discussions at the 2012 Zurich Conference, the goal of the SFX Knowledge Base Advisory Board (KBAB) is to promote first class quality of the data stored in the SFX Knowledge ... [more ▼]

Founded in 2013 as a result of discussions at the 2012 Zurich Conference, the goal of the SFX Knowledge Base Advisory Board (KBAB) is to promote first class quality of the data stored in the SFX Knowledge Base by reviewing the quality assurance policies and processes together with Ex Libris. During its first year, the group identified several issues in order to improve the CKB quality. They shared them with Ex Libris which agreed to work on or to take a look at some. This session will explain how KBAB has been working, and present some of the issues and the improvements brought by Ex Libris. [less ▲]

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See detailLes Mooc : étude énonciative d’une pédagogie multimodale
Dondero, Maria Giulia ULg; Eléni, Mouratidou

in Leclercq, Pierre (Ed.) Communication multimodale et collaboration instrumentée. Regards croisés sur Énonciations, Représentations, Modalités (2014, September 15)

Cette contribution interroge les pratiques de pédagogie multimodale instrumentée des Massive Open Online Courses au travers d’une étude énonciative. Partant du principe que la communication multimodale ... [more ▼]

Cette contribution interroge les pratiques de pédagogie multimodale instrumentée des Massive Open Online Courses au travers d’une étude énonciative. Partant du principe que la communication multimodale instrumentée utilise différentes médiations sémiotiques (vidéo, peinture, dessin à la main, graphique, schéma, sonorité, musique etc.) nous nous proposons d’observer et d’analyser ces types de modalités communicationnelles telles que mises en place par les mooc. Ce, dans l’objectif de saisir la variété des pratiques multimodales auxquelles recourent les Massive Open Online Courses. Nous tentons également de souligner ce qui définit la spécificité de ces pratiques et la manière dont l’étude sémiotique des stratégies énonciatives peut-elle contribuer aux questionnements actuels en sciences de la communication. Nous répondons à ces questions à travers l’analyse de deux mooc issus de deux plateformes différentes : The Future of Storytelling de la plateforme Iversity et Scientific Humanities de la plateforme France Université Numérique. [less ▲]

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See detailIntegrated modelling and uncertainty analysis for assessment of climate change effects on groundwater resource
Goderniaux, Pascal; Wildemeersch, Samuel ULg; Dassargues, Alain ULg

Conference (2014, September 15)

Climate change will bring new pressure on surface and groundwater resources (e.g. Allen et al., 2004; Goderniaux et al., 2009; Van Roosmalen et al., 2009) in many parts of the world. Additional work is ... [more ▼]

Climate change will bring new pressure on surface and groundwater resources (e.g. Allen et al., 2004; Goderniaux et al., 2009; Van Roosmalen et al., 2009) in many parts of the world. Additional work is required to help water managers to plan for future changes. For example, most of studies provide projections for a stationary climate representative of the end of the century, although information is demanded for the near-future. A sophisticated transient weather generator (WG) in combination with an integrated surface-subsurface hydrological model (HydroGeoSphere) are used for producing a stochastic generation of large numbers of equiprobable climatic time series, representing transient climate change, and assess impacts on groundwater resources in a probabilistic way. This new methodology is applied for the unconfined chalky aquifer of Hesbaye (Geer basin in Belgium). The following uncertainty sources are studied : (1) the uncertainty linked to the calibration of the hydrological model, using 'UCODE_2005' (Poeter et al., 2005); (2) the uncertainty linked to the global and regional climatic models (GCMs and RCMs), by using a multi-model ensemble; (3) the uncertainty linked to the natural variability of the weather, by using stochastic climate change scenarios. 30 equiprobable climate change scenarios from 2010 to 2085 have been generated for each of 6 different RCMs. Results show that although the 95% confidence intervals calculated around projected groundwater levels remain large, the climate change signal becomes stronger than that of natural climate variability by 2085. Additionally, the WG ability to simulate transient climate change enabled the assessment of the likely timescale and associated uncertainty of a specific impact. This methodology constitutes a real improvement in the field of groundwater projections under climate change conditions as it enables water managers to analyse risks and take decisions with full knowledge of projected impact and their degree of confidence. [less ▲]

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See detailRandom forests with random projections of the output space for high dimensional multi-label classification
Joly, Arnaud ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

in Machine Learning and Knowledge Discovery in Databases (2014, September 15)

We adapt the idea of random projections applied to the out- put space, so as to enhance tree-based ensemble methods in the context of multi-label classification. We show how learning time complexity can ... [more ▼]

We adapt the idea of random projections applied to the out- put space, so as to enhance tree-based ensemble methods in the context of multi-label classification. We show how learning time complexity can be reduced without affecting computational complexity and accuracy of predictions. We also show that random output space projections may be used in order to reach different bias-variance tradeoffs, over a broad panel of benchmark problems, and that this may lead to improved accuracy while reducing significantly the computational burden of the learning stage. [less ▲]

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See detailInteractions discursives et graphiques en conception architecturale à distance
Joachim, Guillaume ULg

in Leclercq, Pierre (Ed.) Communication multimodale et collaboration instrumentée. Regards croisés sur Énonciations, Représentations, Modalités (2014, September 15)

Cet article présente une analyse qualitative de la conception architecturale à distance outillée par un dispositif de communication multimodale synchrone. À partir d’une transcription et d’un codage de ... [more ▼]

Cet article présente une analyse qualitative de la conception architecturale à distance outillée par un dispositif de communication multimodale synchrone. À partir d’une transcription et d’un codage de vidéos d’architectes qui collaborent en dessinant et discourant simultanément, nous étudions comment ces professionnels utilisent différentes ressources graphiques et verbales pour élaborer collectivement des connaissances. [less ▲]

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See detailDevelopping a physically based groundwater vulnerability concept in a DPSIR framework
Beaujean, Jean ULg; Brouyère, Serge ULg; Lemieux, Jean-Michel et al

Conference (2014, September 15)

A general physically based method is presented to assess vulnerability of groundwater to external pressures with respect to quality and/or quantity issues. In the vulnerability assessments, many ... [more ▼]

A general physically based method is presented to assess vulnerability of groundwater to external pressures with respect to quality and/or quantity issues. In the vulnerability assessments, many scientific authors agree nowadays that ‘physically based’ methods must be preferred to traditional approaches based on empirical overlay and index methods where physical attributes are often mixed with implicitly embedded conventional priorities. Results from one or another of these last methods can consequently be very dissimilar for a given case study and decision makers are losing confidence in these tools. A methodology is proposed to reframe the groundwater vulnerability assessment in a Pressure-State-Impact causal chain that is familiar to decision makers. The DPSIR framework, for describing interactions between society and the environment, defines a chain of Drivers that exert Pressures on the State of a given resource, such as water, which then generates an Impact that will require an appropriate Response (Kristensen, 2004). The concept of groundwater vulnerability assessment considered here is based on the calculation of sensitivity coefficients for a user-defined groundwater state for which several physically-based indicators are proposed. These sensitivity coefficients reflect the easiness with which the groundwater state transmits pressures into impacts. They are grouped into a vulnerability matrix of pressures and impacts that quantify vulnerability for every combination of causal links identified in the DPSIR chain. For that reason, the sensitivity coefficients are converted to vulnerability, using the concept of ‘falling below a given threshold’, which is commonly used in socioeconomic sciences (Luers et al. 2003). Outside the careful selection of the sensitivity analysis method that can significantly influence the computational effort (Beaujean et al., 2013), emphasis will be given to the illustration of the general methodology on a simple case (of an alluvial aquifer with concerns related to water supply) demonstrating the potential use of this general and physically based vulnerability assessment method. While the methodology is general, the choice of causal chains has to be made prior to the calculation. The vulnerability is also related to a damaged state and is related to the ‘distance’ between the current state and a given threshold. This choice is arbitrary such that the vulnerability is sensitive to the choice of the threshold. The framework is general and, when applied to water, can include states that are not limited to quality such as, for example, water quantity and availability. [less ▲]

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See detailAppropriation et gestion d’une activité collaborative distante. Le cas d’un atelier pédagogique de la conception architecturale
Dondero, Maria Giulia ULg; Shirkhodaei, Shima ULg

in Leclercq, Pierre (Ed.) Communication multimodale et collaboration instrumentée. Regards croisés sur Énonciations, Représentations, Modalités (2014, September 15)

Cette étude porte sur l’utilisation du dispositif SDC (Studio Digital Collaboratif) dans un projet collaboratif pédagogique de conception architecturale. Dans une perspective sémiotique, nous étudions le ... [more ▼]

Cette étude porte sur l’utilisation du dispositif SDC (Studio Digital Collaboratif) dans un projet collaboratif pédagogique de conception architecturale. Dans une perspective sémiotique, nous étudions le fonctionnement de la communication médiatisée dans les ateliers de formation par projet. Dans ces ateliers, les encadrants suivent l’avancement du projet de la conception architecturale des étudiants à travers les séances hebdomadaires de correction des documents. Ainsi, nous nous focalisons sur le rôle de l’opérateur — ici une des équipes collaboratrices — en adoptant le point de vue de la sémiotique des pratiques (J. Fontanille, Pratiques sémiotiques, Paris, PUF, 2008). Une perturbation dans l’activité collaborative des étudiants pendant l’atelier est au centre de notre propos et nous permettra de problématiser la question de l’appropriation, de la désappropriation et de la réappropriation de la pratique distante et simultanée. Cette perturbation nous permettra également de valoriser le rôle de l’opérateur dans la gestion d’une activité collaborative outillée en cours d’accomplissement. [less ▲]

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See detailSleep homeostasis and the circadian timing system set the dynamics and excitability of neuronal ensembles
Vandewalle, Gilles ULg

in Journal of Sleep Research (2014, September 14), Suppl

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See detailPsychological processes mediating the link between depression severity and the level of behavioural activation: Assessment of a conceputal model
Wagener, Aurélie ULg; Baeyens, Céline; Blairy, Sylvie ULg

Poster (2014, September 12)

INTRODUCTION. Depression is a common psychopathology characterized by a decrease of the level of behavioural activation (BA) that is the level of engagement in activities. The relationship between ... [more ▼]

INTRODUCTION. Depression is a common psychopathology characterized by a decrease of the level of behavioural activation (BA) that is the level of engagement in activities. The relationship between depression and BA is well-established in the scientific literature. According to theoretical models of depression, psychopathology is also characterized by biases in five sets of psychological processes (PP): self-image (e.g. self-esteem), negative repetitive thoughts (e.g. ruminative thoughts), experiential avoidance (e.g. mindfulness), environmental satisfaction (e.g. environmental reward observation) and emotional regulation (e.g. distress tolerance). Therefore, the present study aims to identify PP mediating the relationship between depression and the level of BA. In order to reach this objective, a conceptual model is tested. METHOD. 361 adults (x ̅ age=36, σ=15), from clinical and non-clinical settings, fulfilled a series of questionnaires assessing several variables: sociodemographic data, depression, anxiety, level of BA and the above-cited five sets of PP. Covariance structure analysis will be conducted in order to test the conceptual model mentioned above. RESULTS. Some preliminary results are presented. As expected, a negative significant correlation between depression and BA (r=-.66, p<.01) have been highlighted. Negative significant correlation appeared between BA and the measured PP: self-esteem (r=-.27, p<.01), ruminative thinking (r=-.53, p<.01), environmental reward observation (=-.13, p<.05). Positive significant correlations appeared between BA and mindfulness (r=.49, p<.01) and distress tolerance (r=.26, p<.01). DISCUSSION. The preliminary results are in line with our hypotheses. Indeed, the level of BA is negatively linked to PP usually biased in depression such as self-esteem. The mediating role of these PP between depression and the level of BA will be discussed. [less ▲]

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See detailJupiter’s magnetopause: A search for wave and reconnection signatures
Bonfond, Bertrand ULg; Kivelson, M. G.; Khurana, K. K. et al

Conference (2014, September 12)

Surface waves and magnetic reconnection are two key processes taking place at the planetary magnetopause. They allow the coupling, through energy (and particle) transfer, of the interplanetary medium and ... [more ▼]

Surface waves and magnetic reconnection are two key processes taking place at the planetary magnetopause. They allow the coupling, through energy (and particle) transfer, of the interplanetary medium and the magnetosphere. The relative importance of large scale Dungey reconnection and viscous interaction (including small-scale intermittent reconnection associated with Kelvin-Helmholtz vortices) are expected to be different at Jupiter compared to the Earth’s case. Such differences would be due to the combination of a) a weaker solar wind pressure and Alfvén velocity as the distance to the Sun increases, b) a high-β plasma sheet, originating from Io’s outgassing, which inflates the Jovian magnetosphere, c) the rapid rotation of the planet relative to its size (e.g. Desroche et al. 2012). Here we analyse the signatures of wave activity and reconnection on the magnetopause of Jupiter, based on magnetic field and energetic particle measurements from the successive spacecraft that explored the Jovian system. Up to now, 7 spacecraft equipped with a magnetometer have crossed the Jovian magnetopause: Pioneer 10, Pioneer 11, Voyager 1, Voyager 2, Ulysses, Galileo and Cassini. We make use of several normal direction finding techniques, such as the Minimum Variance Analysis, in order to identify waves and Kelvin-Helmholtz vortices. As far as the reconnection is concerned, small scale signatures of flux-tube events (FTEs) had been identified by Walker and Russell (1985), based on a limited data-set from the Pioneers’ and Voyagers’ fly-bys. Here we will extend this search to the extensive dataset from all the missions that explored Jupiter’s system. [less ▲]

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See detailRebuilding the educational system in post-conflict context in Kosovo - Survival of the Unmik’s provisions to support the living together through primary education
Pierre, Alexia ULg

Poster (2014, September 12)

In the aftermaths of the Cold War, the International Community adopts the objective of Education for All. Indeed, Education appears as a tool of social and economical development worldwide and supports ... [more ▼]

In the aftermaths of the Cold War, the International Community adopts the objective of Education for All. Indeed, Education appears as a tool of social and economical development worldwide and supports global development. Education allows individuals to take part effectively and actively in the collective life of the society they belong to. Soon after the adoption of this objective, the war is identified as the major obstacle in the fulfillment of this objective of Education for All. The international stakeholders takes their stand in favor of the continuation of the schooling during protracted crisis and wars, what lead to the education in emergency. This education has to spread values, behaviors and attitudes that attack the roots of the conflict. An objective of peace building and conflict prevention is since added to education. In a same temporality, the Kosovo Albanians were submitted to a segregationist policy headed by the Government of Milosevic, the Republika Srpska. This Government aims to make the Kosovo an unmixed territory, inhabited only by Serbs. Kosovo Albanians are rejected from all the state positions and state-owned entreprises. Education appears as a convergent point of the communities antagonisms and a critical issue between Serbs and Albanians in Kosovo. The freedom of being educated in their mother tongue is denied to the Kosovo Albanians through the policy of the Republika Srpska. The Kosovo Albanians react in setting up a parallel education system, in which virtually all the Albanian children intend school from 1992 to 1998. This parallel education system can be seen as a strong element of the pacific resistance of the Kosovo Albanians and a factor of social strength. This parallel educational system collapsed in 1998 due to the war situation in Kosovo. During this internal armed conflict, violations of the Law of war and of the International humanitarian Law are so huge that Nato intervenes through a military air campaign. This military intervention is immediately followed by a civil administration mission, the Unmik, whose mandate is to normalize the life of the inhabitants of Kosovo. Unmik is a restorative model not dedicated to the war victims. The restorative aspects for victims can be seen in the reinstallation of the Kosovo Albanians as full-right citizens. When arriving in Kosovo, Unmik faces two systems of education. Unmik’s first objective is to rebuild a unified education system in Kosovo. Along with objectives of democratization and modernization of a system inherited from a communist model. This intervention is an opportunity to promote and support peace education and conflict prevention through education, in echo with the latest international provisions on education. To achieve this objective of peace building and conflict prevention through education, the pedagogical methods, the contents of teaching and the structure of the education system has to be reformed and restructured. My work aims to explore the reconstruction process of the education system in Kosovo and the operationalization of the provisions that turn education as a tool of peace and conflict prevention, in the primaries schools of Prishtina. My approach is qualitative, inspired by the systemic perspective. The aim of this research is not to evaluate the results of the new Kosovo education system. This work is designed to explore the process of this post-war reconstruction, and to understand how international provisions come within this process and are effectively implemented in the primaries schools. The research question is on the present survival and effectiveness of these provisions in the primaries schools of Prishtina. This work was done first by a confrontation between a corpus of international normative texts on education and a legislative and normative corpus of local texts on education. This first step was dedicated to the selection of the special provisions relative to education as a tool of peace building. It appears that Civic Education and History are the two main teachings in the broadcasting of elements that helps to create a social cohesion. The tools for the data collection were based on the elements selected through this bibliographical research, as the analysis table of the empirical datas. Standardized questionnaires has been completed by teachers in History and Civic Education, and by Directors of the primaries school of Prishtina. Interviews with Kosovo people who were involved in the rebuilding process of the education system were carried out. The results highlights that International Community massively imposed this new model of education, what is visible through the identical profiles of all the schools that participated to the research. It appears that such an intervention is limited by the specificities and the reality of the Kosovo, which were not taken into consideration enough to make this new education system fit well to the very specific aspects of Kosovo. The question of the adaptability of such a model, created out of the Kosovo and without sufficient rely on the local population, is raised through this study. Indeed, the actual education system in Prishtina faces huge challenges in terms of equipment, funding and space. These challenges were not met by the Unmik’s work and are still existing, when the legislative and normative frame is continually developed in respect of the international developments in the matter. Indeed, fundamental education has to be a way to get competencies leading to a democratic citizenship, instead of a way to acquire only school basic knowledge. The potential in peace building and conflict prevention of the present education system in Kosovo is not able to be fully developed. If all the international provisions are well translated into the local provisions and operationalized in the primaries schools, the system has reached its limits and is not able to overcome its numerous challenges. Moreover, there is still two independent systems of education in Kosovo, and the education dedicated to the peace building and conflict prevention reaches only children intended schools of the official system. Serbs children are still educated in the same perspective than during the war. In a long terme perspective, the Kosovo education system will not be able to produce the expected outcomes. This contains risks of resurgence of the conflict. [less ▲]

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See detailWeakening of Jupiter’s main auroral emission in response to magnetospheric hot plasma injections
Badman, Sarah; Bonfond, Bertrand ULg; Fujimoto, M. et al

Conference (2014, September 11)

We present images of Jupiter’s northern UV aurorae taken by the Hubble Space Telescope as part of a large observing campaign in January 2014. The high time resolution observations allow the dynamics of ... [more ▼]

We present images of Jupiter’s northern UV aurorae taken by the Hubble Space Telescope as part of a large observing campaign in January 2014. The high time resolution observations allow the dynamics of the different components of the aurorae to be observed. Particular features of interest are large regions of diffuse emission, which occurred equatorward of the main oval, enveloping the auroral footprint of Ganymede. These diffuse, low latitude emissions are caused by the injection of hot plasma from the outer magnetosphere, a process which has previously been related to interchange between the flux tubes from the outer magnetosphere and outward-moving flux tubes loaded with iogenic plasma. Over the two-week observing interval the auroral signatures of two large injection events were observed, while the main oval generally decreased in intensity. We suggest that the overall dimming of the main oval results from the weakening of the corotation-enforcement currents that drive the main emission, following the replacement of the radially-stretched, mass-loaded flux tubes by more dipolar flux tubes containing rarefied hot plasma. [less ▲]

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See detailHighlights of the 2014 Jupiter observing campaign by multi - spectral remote sensing using space telescopes
Kimura, T.; Badman, S.; Tao, C. et al

Conference (2014, September 11)

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 specifically for planetary observations. In the first campaign in January, Hubble Space Telescope 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, 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. In this presentation, we show remarkable scientific results obtained these campaigns mainly focusing on Jupiter’s aurora. [less ▲]

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See detailEffects of concentrate level on milk production and traffic of grazing cows milked by a mobile automatic milking system on pasture
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

in Hopkins, Alan; Collins, Rosemary; Fraser, Marieacia (Eds.) et al EGF at 50: The future of European Grasslands (2014, September 10)

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and ... [more ▼]

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and returns to the robot was assessed. Concentrates’ level had a positive influence on daily milk production over the grazing period as cows of low concentrates group produced 21.43 ± 0.62 kg compared with 24.33 ± 0.62 kg in high concentrates group. However this effect was modulated subsequently to grass quality and availability. Regarding daily voluntary returns to the robot, high concentrates group showed higher frequency (3.66 ± 0.05, compared with 3.22 ± 0.04 in low concentrates group) demonstrating positive impact of complement distribution on cows’ traffic. [less ▲]

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See detailEffects of mild heat stress periods on milk production, milking frequency and rumination time of grazing cows milked by an automatic milking system
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

Poster (2014, September 10)

Grazing dairy cows milked by an automatic system (AS) experienced mild heat stress (HS) periods, twice during the summer. The daily temperature humidity index (THI) during these periods were higher than ... [more ▼]

Grazing dairy cows milked by an automatic system (AS) experienced mild heat stress (HS) periods, twice during the summer. The daily temperature humidity index (THI) during these periods were higher than 72. Milk production, as well as milking frequency, rumination time and milk fat to protein ratio (F/P) during these periods were compared to adjacent periods with mean THI of 61. The daily milking frequency, the total number of visits to AS and the milk production were significantly higher in HS periods (2.12 vs 1.97, 2.99 vs 2.69, and 19.7 vs 18.5 kg milk per cow, respectively). There were significant interactions between times and periods for milking frequency and number of visits, while the daily rumination time was significantly lower (339 vs 419 min) and the F/P in milk tended to be decreased (1.17 vs 1.23). These results could be explained by changes in cow behaviour during HS periods. [less ▲]

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See detailPressure-impulse diagram of a beam under explosion - Influence of the indirectly affected part
Hamra, Lotfi ULg; Demonceau, Jean-François ULg; Denoël, Vincent ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September 10)

The paper studies the structural response of a beam subjected to a close-field local internal blast loading. In the literature, the pressure-impulse (p-I) diagram is commonly used to design elements or ... [more ▼]

The paper studies the structural response of a beam subjected to a close-field local internal blast loading. In the literature, the pressure-impulse (p-I) diagram is commonly used to design elements or structures for a given blast loading. The p-I diagram is a spectrum representing the level sets of damage or required ductility for a given structural system, nonlinear beam in this paper. This representation is much appreciated because a simple reading for the actual pressure p and impulse I of the considered load indicates the ductility demand of the structural system. Recent works of quasi-static behaviour have indicated the crucial need to account for the membrane effects taking place in the extreme loading of frame beams. This paper will thus extend the state-of-art features, establishing thus the p-I diagram for a beam including the lateral restraints offered by the rest of the structure, the development of non-linear membrane action and also, the M-N interaction that develops in the plastic hinges. [less ▲]

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See detailCFD Comparison of hydrodynamics between BIOSTAT® Cultibag STR and standard Stirred Cell Culture Bioreactors
Calvo, Sébastien ULg; Delafosse, Angélique ULg; Crine, Michel ULg et al

Poster (2014, September 10)

Single-use bioreactors have been increasingly used for animal cell cultures on microcarriers in screening experiments. Because of their manufacturing process, the shape of these kinds of vessels such as ... [more ▼]

Single-use bioreactors have been increasingly used for animal cell cultures on microcarriers in screening experiments. Because of their manufacturing process, the shape of these kinds of vessels such as the BIOSTAT® Cultibag STR one, is limited. For example, technical constraints on weld seams limit angles to 30° and no baffle may be installed. The shape of standard re-usable vessels may thus not be exactly reproduced and the flow structure may thus significantly differs from the flow structure in standard bioreactors. [less ▲]

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See detailEffects of concentrate level on milk production and traffic of grazing cows milked by a mobile automatic milking system on pasture
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

in Hopkins, Alan; Collins, Rosemary; Fraser, Marieacia (Eds.) et al EGF at 50: The future of European Grasslands (2014, September 10)

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and ... [more ▼]

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and returns to the robot was assessed. Concentrates’ level had a positive influence on daily milk production over the grazing period as cows of low concentrates group produced 21.43 ± 0.62 kg compared with 24.33 ± 0.62 kg in high concentrates group. However this effect was modulated subsequently to grass quality and availability. Regarding daily voluntary returns to the robot, high concentrates group showed higher frequency (3.66 ± 0.05, compared with 3.22 ± 0.04 in low concentrates group) demonstrating positive impact of complement distribution on cows’ traffic. [less ▲]

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See detailEffects of concentrate level on milk production and traffic of grazing cows milked by a mobile automatic milking system on pasture
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg

in Hopkins, Alan; Collins, Rosemary; Fraser, Marieacia (Eds.) et al EGF at 50: The future of European Grasslands (2014, September 10)

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and ... [more ▼]

Cows milked by an automatic milking system in pastures were assigned in 2 groups receiving different amounts of concentrates (2.1 kg vs 4.1 kg). The effect of concentrates’ level on milk yield (MY) and returns to the robot was assessed. Concentrates’ level had a positive influence on daily milk production over the grazing period as cows of low concentrates group produced 21.43 ± 0.62 kg compared with 24.33 ± 0.62 kg in high concentrates group. However this effect was modulated subsequently to grass quality and availability. Regarding daily voluntary returns to the robot, high concentrates group showed higher frequency (3.66 ± 0.05, compared with 3.22 ± 0.04 in low concentrates group) demonstrating positive impact of complement distribution on cows’ traffic. [less ▲]

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See detailStudy of the conditions of conidiation for the bio-fungicide Pseudozyma flocculosa
ZAKI, Omran

Poster (2014, September 07)

Pseudozyma flocculosa is a useful fungus and is used in biological control of mildew. The reproduction of this fungus seems to be exclusively asexual by conidia’s production. The latter physiological form ... [more ▼]

Pseudozyma flocculosa is a useful fungus and is used in biological control of mildew. The reproduction of this fungus seems to be exclusively asexual by conidia’s production. The latter physiological form seems to be resistant to downstream process and storage conditions. Therefore, it represents the most commonly form used in agriculture as Fungicide. However, production of conidia in submerged culture is usually uncertain, often with very low yield. Despite the advantages that P. flocculosa offers in biological control, its use remains largely limited compared with that of chemical fungicides. This is probably due to the difficulty to produce mature conidia with high yields. In this work, our aim is to decipher developmental phases of conidia by this useful strain. We start by conidia production in submerged and semisolid fermentation. We then focus on comparative study of different kinds of obtained conidia. [less ▲]

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See detailRANS and Large Eddy Simulation of the hydrodynamics inside mini-bioreactors designed for stem cell culture
Collignon, Marie-Laure ULg; Martin, Céline; Blanchard, Fabrice et al

Conference (2014, September 07)

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See detailCannabis use initiation among adolescents: the predictive role of peers, alcohol, expectancies and internalizing factors.
Schmits, Emilie ULg; Mathys, Cécile ULg; Quertemont, Etienne ULg

Conference (2014, September 05)

Theoretical background: Cannabis is the most commonly used illicit drug among teenagers. Initiation is influenced by environmental factors and personal characteristics, events or experiences. An early ... [more ▼]

Theoretical background: Cannabis is the most commonly used illicit drug among teenagers. Initiation is influenced by environmental factors and personal characteristics, events or experiences. An early initiation increases the risks of problems related to cannabis use (e.g. negative psychosocial effects, delinquent behaviors, mental disorders). Prevent initiation, through the identification of risk/protective factors and their interaction, seems crucial in terms of public health. Research question and significance: This study aimed to examine the progression of use, to identify protective and risk factors of cannabis initiation (including peers, alcohol, expectancies and internalizing factors) and to specifically focus on the influence of social anxiety and its moderators/mediators. Methods: A questionnaire was administered twice to 877 teenagers (49.94% female, M=15.61) with one year interval. Sex, age, demographic variables, peer cannabis use, cannabis-related variables (lifetime, frequency, problems and expectancies), alcohol use, social anxiety, trait-anxiety and depression were assessed through validated scales. Logistic regressions, mediation and moderation analyzes were performed. Results: During the follow-up period, 12.89% of the young participants initiated cannabis use. Several factors significantly predict initiation: alcohol use, peer users, perceptual enhancement and craving effect expectancies. Others factors significantly protect from initiation: negative behavioral effect expectancies and social anxiety. Gender, age, relaxation/social facilitation and cognitive impairment effect expectancies, trait-anxiety and depression do not significantly influence cannabis use initiation. In moderated mediation model, after controlling for relevant variables, social anxiety protected from initiation trough the mediating role of perceptual enhancement and craving effect expectancies. The number of peer users and alcohol use do not moderate this mediation. Negative behavioral effect expectancies do not significantly mediate the relation between social anxiety and cannabis initiation. Interpretation of findings: Through low positive expectancies, adolescents with social anxiety symptoms are less likely to initiate cannabis use than the others, whatever the number of peer users and the alcohol use. Findings are discussed in terms of risk and protective characteristics of relevant factors, in an overall and evolutionary approach including internalizing factors. Results support the identification of internalizing profile of adolescents concerned by prevention or treatment and the importance of social anxiety and expectancies in intervention. [less ▲]

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See detailIs Geometallurgy Teachable? A challenge for the new Erasmus Mundus EMerald
Pirard, Eric ULg

Conference (2014, September 05)

designate any kind of advanced ore characterisation prior to mineral processing operations while in fact it should clearly refer to a multidisciplinary integration of geological, mining, metallurgical ... [more ▼]

designate any kind of advanced ore characterisation prior to mineral processing operations while in fact it should clearly refer to a multidisciplinary integration of geological, mining, metallurgical, environmental and economic information into a single orebody model. In order to instil the best available geometallurgical practices in the professional world, it seems essential to break the traditional cleavages among disciplines and educate a new generation of engineers. The Erasmus Mundus EMerald “Master in Georesources Engineering” program initiated by four European universities under the coordination of University of Liege, has been designed to exactly tackle this challenge. It is not surprising that this program has been set up by universities having a long tradition in mixing a double perspective of geology and engineering (Nancy; Lulea; Liege and Freiberg). Geometallurgy requires both an excellent understanding of the natural variability and complexity of an ore and a comprehensive overview of the techniques available to extract and concentrate any valuable material. The course program has been designed to achieve a right balance between knowledge of mineral resources (geology, resource characterisation, reserve estimation, modelling) and processing (comminution, preconcentration, leaching, waste disposal,...). It also includes a broader view on life cycle analysis and urban mining. A series of professional seminars, suggested by an industrial advisory board, shed light on strategic issues, economic and environmental challenges, corporate social responsibilities, etc. Mobility and multicultural experience is an added-value of the Erasmus Mundus experience which definitely contributes to breeding engineers for tomorrow. [less ▲]

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Dodeigne, Jérémy ULg

Conference (2014, September 04)

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See detailPhysiopathology of cerebral palsy
VIELLEVOYE, Renaud ULg

Conference (2014, September 03)

Cerebral palsy describes a group of disorders of the development of movement and posture, causing activity limitation, that are attributed to nonprogressive disturbances that occurred in the developing ... [more ▼]

Cerebral palsy describes a group of disorders of the development of movement and posture, causing activity limitation, that are attributed to nonprogressive disturbances that occurred in the developing fetal or infant brain. The vulnerability of different brain structures and types of disability associated with CP are influenced by the gestational age at which brain development is altered. Understanding the pathophysiology of CP is crucial for the development of neuroprotective strategies. In the first trimester of gestation, genetic disorders, infectious and toxic diseases explain the vast majority of lesions. In the preterm newborn, neuroinflammation and anoxo-ischemia induce activation of the microglia and a maturational blockade of oligodendrocytes disrupting the developmental program of white matter. In term infants, hypoxic-ischemic encephalopathy is the consequence of the excitotoxic cascade leading to cortical and/or basal ganglia lesions. Clinical disabilities are the consequence of these lesions modulated by cerebral plasticity process. [less ▲]

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See detailCost monitoring to promote the value added for clam raising farmers in the Northern area of Vietnam
Bui Thi, Nga; Tran Thu, Hoai; Tran Huu, Cuong et al

Conference (2014, September 02)

Clam farming in coastal provinces of Vietnam has notably developed since the last decade. It generated high income, improve socio-economic development for many local communities. However, many clam ... [more ▼]

Clam farming in coastal provinces of Vietnam has notably developed since the last decade. It generated high income, improve socio-economic development for many local communities. However, many clam raising farms are facing difficulties of farm management, disease control, markets and systems of quality control. This research aims to study about the real situation of cost monitoring in the clam raising farms in the Northern area of Vietnam and suggest some recommendation for apply a suitable model for cost monitoring to promote the value added for farmers. The paper based on the semi-structure, standard questionnaires and PRA method to collect data from 89 clam raising farms in two coastal provinces (Nam Dinh and Thai Binh) in the Northern area of Vietnam in 2014. The findings show that clam raising provides farmers a chance of getting high income parallel with high risk. There were 32.15% surveyed farms got profit, 32.14% of them met the breakeven and 35.71% was lost. The study finds out four key factors affecting farms’ economic performance and efficiency. The first is capacity of farm cost control as the cost for clam raising was very high at 8,142 to 9,190 USD per ha. The second is the farmers’ experience, skill, technique and ability of risk control. The third is low, unstable market price and unsuitable market channel with the dominant of the traders. Final factors is the area and location of clam raising. Despite of these difficulties, 55.14% surveyed farms still want to expand their production, 25% of them will continue, and only 17.86% will stop or change to other activities. In order to promote the value added for clam raising farmers, cost control should be paid more attention, improvement of the farmers’ capacity is necessary, and market should be regarded. [less ▲]

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See detailFrom geometallurgy to ecometallurgy:Building mines for the future
Pirard, Eric ULg

Conference (2014, September 02)

geometallurgy will become the central pivot of a successful mining operation. Recently, Europe has awakened from a long period of lethargy in the raw materials sector. A series of important initiatives ... [more ▼]

geometallurgy will become the central pivot of a successful mining operation. Recently, Europe has awakened from a long period of lethargy in the raw materials sector. A series of important initiatives inspired by the European Innovation Partnership (EIP) have paved the way for more intense cooperation between industry, research centres and universities. Among these, the establishment of a Knowledge Innovation Community (KIC) in 2015 will definitely boost innovation and education in the sector. Interestingly, EIP addresses the whole value chain and considers mining, recycling and substitution as essential pillars of the raw materials policy. This vision strengthens the role of geometallurgy but also brings up the need for a close dialogue between mineralogists, metallurgists and product designers. Microelectronics and nanotechnologies are ubiquitous in our technologies and have greatly improved their functionality, but they have also made recycling and efficient recovery of metals a tough technical challenge. Our urban mines formed by the accumulation of end-of-life products should be scrutinized from now on using an ecometallurgical approach whereby important questions should be addressed such as: 1. Metal concentrations: Is the metal grade high enough to pay for recycling? Does the manufacturer help to maintain grades above a technological cut-off? 2. Metal speciation: Under which form (alloy, salt, organic compound,…) is the metal present? Is there a processing technology available to separate these species? 3. Metal paragenesis: What are the metal assemblages found in the product? Will it be feasible to separate those metals and at what costs? Are there penalty or contaminating elements associated? 4. Textural assemblage: How will the product behave during dismantling? Is it realistic to liberate a given component? What comminution strategy will be needed to achieve phase liberation? 5. Reserve estimation: What are the tonnages expected for this kind of product? Can selective collection be organised? 6. Homogeneity: What will the next generation of products look like? Should one expect strong differences in concentration, speciation, paragenesis, etc.? Will this kind of product be blended with others during collection? How will this impact on downstream recycling? Ecometallurgy, as introduced here, is essentially about establishing a dialogue with product designers and material scientists to make sure that, once unearthed, metals will remain easily and sustainably available for the future generations. Geologists and mineralogists, even though generally kept away from the synthetic materials, could greatly contribute to this progress by bringing their expertise in dealing with complex and variable orebodies of the future. [less ▲]

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See detailMineralogy of fine particles in slurry from multispectral imaging
Leroy, Sophie ULg; Dislaire, Godefroid ULg; Barnabé, Pierre ULg et al

Conference (2014, September 02)

Quantitative mineralogy of fine particles in slurry from multispectral imaging Sophie Leroy, Godefroid Dislaire, Pierre Barnabé and Eric Pirard Mineral processing especially in its final stages relies ... [more ▼]

Quantitative mineralogy of fine particles in slurry from multispectral imaging Sophie Leroy, Godefroid Dislaire, Pierre Barnabé and Eric Pirard Mineral processing especially in its final stages relies heavily on the differential behavior of particles in pulps. In order to monitor hydrocyclones and flotation cells in almost real time, it is important to develop at line particle characterization providing information on particle distribution but also mineralogy. A sampling device has been elaborated based on a flow cell with variable wall spacing linked to a high pressure peristaltic pump. This setup allows for dispersion and dilution of the mineral slurry into the cell. Depending on the ore or gangue minerals to be controlled, particles can be imaged either in diffuse reflectance or in transmittance mode. A simple multispectral imaging module has been designed to acquire images at eight different wavelengths. The design is based on a series of dichroic filters thereby avoiding any moving part and enabling a very fast acquisition of multispectral images. Imaging artifacts due, among others, to specular reflectance from the glass window are minimized. Multispectral classification is used to outline particles appearing in the field of view and to qualify their main mineral component. In particular, areas reflecting a meaningful and discriminative spectrum are identified and compared to a multispectral database. The database is continuously enriched through testing of pure mineral particles under similar pulp conditions (dilution, grain size,…). Results of final classification are compared to the modal analysis obtained from polished blocks and conventional reflected light microscopy. The technology developed in this work sets the basis for at line monitoring of ore slurries with reasonably simple mineralogy. Extension of the spectral range is being considered for future developments. [less ▲]

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See detailPredictive microbiology combined with metagenomic analysis targeted on the 16S rDNA : A new approach for food quality
Delhalle, Laurent ULg; Ellouze, Mariem; Taminiau, Bernard ULg et al

Poster (2014, September 01)

The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods may not be relevant to understand the modifications of the microbial ecology in food products ... [more ▼]

The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods may not be relevant to understand the modifications of the microbial ecology in food products. Metagenomic analysis targeted on 16S ribosomal DNA can elucidate microbial community structures at a muche higher resolution than was previously possible. Combined with predictive microbiological models, a new approach was investigated to take into account bacterial populations dynamics in perishable foods under different environmental conditions. White pudding samples, a typical Belgian pork meat product, were packed under food wrap (atmospheric air condition). Durability studies were conducted at 4°C, 12°C and a dynamic temperature profile according to the NF V01-003 standards (4°C (1/3 of the shelf life) - 8°C (2/3 of the shelf life)) during 15 days. The effect of organic acids was also investigated using a lactic acid (1.8% w/w) treatment. At each day of the trials, classical microbiological (total flora) and 16S rDNA metagenomic analysis were carried out on all these samples. For the metagenomic analysis, a sequencing library was generated, targeting the V1-V3 region of the 16S rDNA. The two major bacterial populations were thus identified (Psychrobacter sp and Brochotrix thermosphacta) and predictive microbiology models used to assess the growth parameters. Cardinal parameters for temperature were collected on the two main bacterial species. The model was validated using the data obtained at a dynamic temperature profile. The results of the simulations for Psychrobacter sp and Brochotrix thermosphacta show a good compliance between predicted and observed data. Compared to culture based methods on selective media and previous independent culture techniques, metagenomic analysis combined with predictive microbiology gives more valuable information, and could be considered as a technological breakthrough to control the quality or for accurately determining shelf life. [less ▲]

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See detailI know what you did last summer - High resolution mapping of wild boar damages with drones
Michez, Adrien ULg; Morelle, Kevin ULg; Lehaire, François ULg et al

Poster (2014, September 01)

Wild boar ability to cause important damages to agricultural lands is not anymore to be demonstrated. These damages often raise conflicts between farmers and hunters due to the associated economic losses ... [more ▼]

Wild boar ability to cause important damages to agricultural lands is not anymore to be demonstrated. These damages often raise conflicts between farmers and hunters due to the associated economic losses. Objective and accurate method for real impact assessment of losses suffered by farmers is thus needed. Currently,in Wallonia damage assessment is performed from the ground by experts, asked to evaluate precisely the area impacted. This task is time and man power consuming. Moreover, damaged areas are often large and consequently, sampling is mandatory and can induce accuracy issues. Recent development of unmanned aerial vehicle (UAV / drone) toghether with lower cost and better accessibility for civil society and scientific community, makes now possible the use of this technology for wildlife researches. Through photogrammetric 3D reconstruction of the field crop, UAV can allow to objectively and precisely measure the area impacted by wild boar damages. In a context of increasing issues caused by wild boar to agriculture, and the need for stakeholders for accurate impact assessment, we tested an innovative approach to estimate more effectively the area impacted by wild boar. [less ▲]

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See detailTechnical variability in the Gravettian with tanged tools: new results from Belgium
Touzé, Olivier; Flas, Damien ULg; Pesesse, Damien

Conference (2014, September 01)

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See detailCIRCULAR TUBE COLUMNS IN HIGH STRENGTH STEEL: Economical solutions for building frames
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September)

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See detailRole of estradiol in the feminization of lordosis behavior
Trouillet, Anne-Charlotte ULg

Poster (2014, September)

The classic theory of mammalian brain and behavioral sexual differentiation holds that an organizational action of testosterone, secreted perinatally by the male’s testes, controls male-typical aspects of ... [more ▼]

The classic theory of mammalian brain and behavioral sexual differentiation holds that an organizational action of testosterone, secreted perinatally by the male’s testes, controls male-typical aspects of brain and behavioral development, whereas no active perinatal sex hormone signaling is required for female-typical differentiation. However, it has recently been shown using aromatase knock out (ArKO) mice, which are deprived of estradiol due to a targeted mutation in the aromatase gene, that estradiol may also actively contribute to the differentiation of female-typical aspects of behavior over a specific pre-pubertal period. Sexual behavior is a well known sexually dimorphic behavior, and thus provides a good model for studying the sexual differentiation of the brain. Female ArKO mice showed significantly lower levels of lordosis behavior than wild type controls following adult ovariectomy and treatment with ovarian hormones. This deficit was restored by treating female ArKO mice with estradiol benzoate between postnatal days 15 and 25. However, the mechanism by which estradiol acts prepubertally in female mice to feminize lordosis behavior remains to be elucidated. Therefore, in a first attempt, we will determine which neuropeptides are in particularly sensitive to estradiol action over the prepubertal period. We will focus on neuropeptides which have been shown to be implicated in lordosis behavior. Studies by the group of Micevych have proposed an important role for NPY and beta-endorphin (B-END) neurons in the arcuate nucleus (ARC) in the estradiol-mediated activation of lordosis behavior in female rats. An in vitro study recently showed that kisspeptin directly activates arcuate (ARC) B-END neurons. This is particularly interesting since unpublished results from our laboratory showed that Kp neurons are directly involved in the expression of lordosis behavior. We are thus currently determining the expression of NPY, B-END, and kisspeptin in the ARC as well as μ-opioid receptors MORs in the MPN over the prepubertal period and their possible modulation by prepubertal estradiol treatment. Interestingly, we also observed that our treatment may have an organizational effect on the regulation of energy balance. Indeed, administration of estradiol over the prepubertal period restores a normal weight in ArKO mice, which are normally obese in adulthood. It has been shown that ArKO mice present a lower spontaneous physical activity which can be one cause of their obesity. However, our treated mice did not show an increase in their locomotion behavior. These new observations suggest that estradiol during prepubertal development may have an additional role in the organization of brain circuits regulating the energy balance. [less ▲]

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See detailAutomatization of mirror - tracing skill in children with Developmental Coordination Disorder
Lejeune, Caroline ULg; Meulemans, Thierry ULg; Desmottes, Lise ULg et al

Poster (2014, September)

Aim: This study investigated the hypothesis of a skill automatization deficit in Developmental Coordination Disorder (DCD). Method: Thirty children (15 with DCD and 15 control children), aged between 7 ... [more ▼]

Aim: This study investigated the hypothesis of a skill automatization deficit in Developmental Coordination Disorder (DCD). Method: Thirty children (15 with DCD and 15 control children), aged between 7 and 12 years old, were administered the mirror-tracing task during two 10-trials sessions separated by one week. An auditory interference task was introduced at the end of the procedural learning phase to test skill automatization. Results: Interestingly, no between-group difference was revealed in learning and automatization measures except for a specific subgroup of DCD children (n=5) who experienced difficulties in skill automatization. Conclusion: The results of our preliminary study highlighted the heterogeneity of the deficit presented in DCD and they emphasized the importance to explore further the lack of automatization in DCD. [less ▲]

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See detailAccurate monitoring of the rumination behaviour of cattle using IMU signals from a mobile device
Andriamandroso, Andriamasinoro ULg; Lebeau, Frédéric ULg; Bindelle, Jérôme ULg

in Hopkins, A; Collins, RP; Fraser, MD (Eds.) et al EGF at 50: The Future of European Grasslands. Proceedings of the 25th General Meeting of the European Grassland Federation. (2014, September)

Improving the monitoring of rumination in cattle could help in assessing of the welfare status and their risk of acidosis. In this work, the monitoring of cattle’s behaviour was performed using the ... [more ▼]

Improving the monitoring of rumination in cattle could help in assessing of the welfare status and their risk of acidosis. In this work, the monitoring of cattle’s behaviour was performed using the inertial measurement unit (IMU) present in smartphones mounted on the neck of cows. The processing of both time and frequency domains of the IMU signals was capable to detect accurately the main behaviours (grazing, rumination and other) and highlight the characteristics of the rumination process. The algorithm for analysis of rumination was more accurate for grazing cattle than for silage-fed cattle in stables. [less ▲]

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See detailA Multiphysics model of neotissue growth in a perfu sion bioreactor
Guyot, Yann ULg; Papantoniou, Ioannis; Schrooten, Jan et al

Conference (2014, September)

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See detailThe Belgian Reform of Mental Health: Changing the Face of Psychiatric Hospitals
Thunus, Sophie ULg

Conference (2014, September)

This paper focuses on the ongoing reform of psychiatric and mental health care delivery in Belgium. It starts by mentioning particularities of the system’s development, then it defines the reform’s ... [more ▼]

This paper focuses on the ongoing reform of psychiatric and mental health care delivery in Belgium. It starts by mentioning particularities of the system’s development, then it defines the reform’s objectives and policy instruments used to reach these objectives and, finally, it indicates specific issues and outcomes resulting from the implementing. [less ▲]

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See detailCalibration of Building Simulation Models: Assessment of Current Acceptance Criteria
Ruiz Flores, Roberto ULg; Lemort, Vincent ULg

in Proceedings of the 8th International Conference Improving Energy Efficiency in Commercial Buildings (IEECB’14) (2014, September)

In this paper, the most used acceptance criteria in calibration of building simulation models are introduced and tried out by means of a practical exercise. In order to simplify the process of obtaining ... [more ▼]

In this paper, the most used acceptance criteria in calibration of building simulation models are introduced and tried out by means of a practical exercise. In order to simplify the process of obtaining “simulated data” and to avoid carrying out a formal calibration procedure; two yearly testing profiles (hourly time scale) are created from real building electrical metered data (¼ hour profile). Both testing profiles represent two model responses that could possibly be obtained in a common calibration procedure. The objective of this work is to test the capabilities of the method to determine (1) the model adequacy to represent an existing situation; (2) the reliability of the model when predicting a future or different scenario and also (3) the ability of the method to orient the practitioner to upgrade the model when it provides a non-satisfactory response. To do this, the real accuracy of both testing profiles is verified by means of a complementary statistical bin analysis. This crosschecking analysis allows highlighting the strengths and weakness of the current criteria and determining whether they need to be revised, modified or complemented. At the end of the analysis, it is concluded that the capabilities of the current acceptance criteria are limited because don’t provide any satisfactory answer, indication or clue for none of the three points aforementioned and some other complementary tests (such as bin analysis) must be implemented and performed in order to properly declare a model as calibrated. [less ▲]

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See detailVascular endothelial growth factor : a blood biomarker in canine pulmonary fibrosis.
Roels, Elodie ULg; Krafft, Emilie ULg; Heikkilä, H.P. et al

in Proceedings of the 24th Ecvim Meeting, Mainz, Germany - 4-6 September 2014 (2014, September)

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See detailBright light therapy in restless legs syndrome: a doubleblind, placebo-controlled study
Kilic-Huck, Ulker; Meyer, Christelle ULg; Ruppert, Elisabeth et al

in Journal of Sleep Research (2014, September), 23

Medications often partially alleviate the symptoms of RLS patients, emphasizing the need for finding alternative treatments. Recent studies reported an efficacy of bright light therapy (BLT) in Parkinson ... [more ▼]

Medications often partially alleviate the symptoms of RLS patients, emphasizing the need for finding alternative treatments. Recent studies reported an efficacy of bright light therapy (BLT) in Parkinson disease. RLS pathogenesis involves the dopaminergic system and light has been shown to influence the dopaminergic tone. Therefore, the objective of our study was to determine the therapeutic value of three weeks of BLT on RLS symptoms severity, sleep quality, daytime somnolence, circadian rhythms and mood. [less ▲]

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See detailElectronic nose for reactor stability monitoring of an agricultural co-digestion biogas plant
Adam, Gilles ULg; Lemaigre, Sébastien; Delfosse, Philippe et al

in Progress in Biogas III - Biogas Production from agricultural biomass and organic residues (2014, September)

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See detailCorrelation between thoracic ct-scan angiography findings and echocardiographic right pulmonary vein to pulmonary artery ratio in west highland white terriers with idiopathic pulmonary fibrosis.
Roels, Elodie ULg; Merveille, Anne-Christine ULg; Couvreur, T. et al

in Proceedings of the 24th Ecvim Meeting, Mainz, Germany - 4-6 September 2014 (2014, September)

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See detailThe Double-Sarcophagus of Hierapytna (Creta). A Reassessment
Veymiers, Richard ULg

Conference (2014, September)

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See detailPractical design of a nonlinear tuned vibration absorber
Grappasonni, Chiara ULg; Habib, Giuseppe ULg; Detroux, Thibaut ULg et al

in Proceedings of the ISMA 2014 conference (2014, September)

The aim of the paper is to develop a new nonlinear tuned vibration absorber (NLTVA) capable of mitigating the vibrations of nonlinear systems which are known to exhibit frequency-energy-dependent ... [more ▼]

The aim of the paper is to develop a new nonlinear tuned vibration absorber (NLTVA) capable of mitigating the vibrations of nonlinear systems which are known to exhibit frequency-energy-dependent oscillations. A nonlinear generalization of Den Hartog’s equal-peak method is proposed to ensure equal peaks in the nonlinear frequency response for a large range of forcing amplitudes. An analytical tuning procedure is developed and provides the load-deflection characteristic of the NLTVA. Based on this prescribed relation, the NLTVA design is performed by two different approaches, namely thanks to (i) analytical formulas of uniform cantilever and doubly-clamped beams and (ii) numerical shape optimization of beams with varying width and thickness. A primary system composed of a cantilever beam with a geometrically nonlinear component at its free end serves to illustrate the proposed methodology. [less ▲]

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See detailIntroducing the Belgian Science and Technology Studies Network (BSTS)
Meyers, Gert; Van Oudheusden, Michiel ULg; Thoreau, François ULg et al

Poster (2014, September)

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See detailSELF BROADENING COEFFICIENTS AND IMPROVED LINE INTENSITIES FOR THE v7 BAND OF C2H4 NEAR 10.5 µm, AND IMPACT ON ETHYLENE RETRIEVALS FROM JUNGFRAUJOCH SOLAR SPECTRA
Vander Auwera, Jean; Fayt, André; Tudorie, Marcella et al

Poster (2014, September)

Relying on high-resolution Fourier transform infrared (FTIR) spectra, the present work involved extensive measurements of individual line intensities and self-broadening coefficients for the ν7 band of ... [more ▼]

Relying on high-resolution Fourier transform infrared (FTIR) spectra, the present work involved extensive measurements of individual line intensities and self-broadening coefficients for the ν7 band of 12C2H4. The measured self-broadening coefficients exhibit a dependence on both J and Ka. Compared to the corresponding information available in the latest edition of the HITRAN spectroscopic database, the measured line intensities were found to be higher by about 10 % for high J lines in the P branch and lower by about 5 % for high J lines of the R branch, varying between these two limits roughly linearly with the line positions. The impact of the presently measured line intensities on retrievals of atmospheric ethylene in the 949.0–952.0cm 1 microwindow was evaluated using a subset of ground-based high-resolution FTIR solar spectra recorded at the Jungfraujoch station. The use of HITRAN 2012 with line intensities modified to match the present measurements led to a systematic reduction of the measured total columns of ethylene by -4.1 +/- 0.1 %. [less ▲]

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See detailImplications of microbial phenotypic heterogeneity in large-scale bioprocessing conditions
Delvigne, Frank ULg; Gorret, Nathalie; Molina-Jouve, Carole et al

Conference (2014, September)

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See detailGlucose use and lactate production by equine fresh semen in human and equine extender
Ponthier, Jérôme ULg; De Tullio, Pascal ULg; Parrilla-Hernandez, Sonia et al

in Reproduction in Domestic Animals (2014, September), 49(suppl 3), 13

This study shows that this human semen extender doesn’t support equine semen preservation. Sperm cells’ glucose consumption and lactate production seem to be negligible, as these parameters were not ... [more ▼]

This study shows that this human semen extender doesn’t support equine semen preservation. Sperm cells’ glucose consumption and lactate production seem to be negligible, as these parameters were not affected by sperm concentrations in our study. Our results suggest that spermatozoa are able to cleave complex carbohydrates as glucose concentration in INRA96 increased over time. [less ▲]

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See detailUse of Inertial Measurement Unit of a Mobile Device to Discriminate Cattle Grazing and Ruminating Behaviours on Pasture
Andriamandroso, Andriamasinoro ULg; Bindelle, Jérôme ULg; Lebeau, Frédéric ULg

in Animal Production in Australia (2014, September)

Precision livestock farming is emerging in the wake of the technological developments in remote sensing and motion monitoring. Tools are developed to allow accurate real time monitoring of the individual ... [more ▼]

Precision livestock farming is emerging in the wake of the technological developments in remote sensing and motion monitoring. Tools are developed to allow accurate real time monitoring of the individual cattle behaviour in a quest to improve the management of pastures. Studies have shown the relevancy of accelerometers in the analysis of behaviour using dedicated devices. Accelerometers are located either close to the mouth or jaw of the animal or on its forehead or neck. Records are usually performed at low frequency (<1Hz) and most studies classify behaviours using neuronal networks or multivariate statistical approaches, with little consideration to the animals’ actual movements. Inertial measurement units (IMU) in consumer mobile devices are specifically developed to record accurately user movements. Besides 3D-accelerometer, they can include 3-D rotational speed sensors, 3-D magnetometers and GPS. Optimised power consumption offers significant autonomy. Data directly acquired from the sensors and IMU signals from build-in proprietary algorithms can be recovered using user-friendly low-cost applications. Moreover, mobile devices can store or communicate information by wireless in real time at high frequency. As movements of cattle are in the same range as humans, this study investigates the relevancy of mobile devices IMU signals to discriminate main behaviours of cattle on pasture. [less ▲]

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See detailThe earliest seed plants from Gondwana: palaeogeographical and evolutionary implications based on Tournaisian (Mississippian) records from Argentina
Prestianni, C.; Rustán, J.J.; Balseiro, D. et al

Conference (2014, September)

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See detailAdaptation interculturelle et validation du questionnaire VISA-P en français
Oppong-Kyei, Julian; Bruyère, Olivier ULg; Delvaux, François ULg et al

in 7ème Congrès National SFMES & SFTS 2014 (2014, September)

Introduction La tendinopathie patellaire est une affection musculo-squelettique très fréquentes chez le sportif et la plus fréquente au niveau du genou. Elle affecte le plus souvent des disciplines qui ... [more ▼]

Introduction La tendinopathie patellaire est une affection musculo-squelettique très fréquentes chez le sportif et la plus fréquente au niveau du genou. Elle affecte le plus souvent des disciplines qui nécessitent soit des impulsions et des sauts soit un travail important du quadriceps. Le Victorian Institute of Sports Assessment–Patellar (VISA-P) est un questionnaire permettant d’évaluer les symptômes et leurs retentissements sur les activités physiques quotidiennes et sportives de la tendinopathie patellaire (Jumper’s knee). Comme la plus part des questionnaires de ce type, le VISA-P fut originalement développé pour des patients anglophones et n'est donc pas adapté à une population francophone. En conséquence, l'objectif de cette étude sera de traduire, adapter et valider une version française fiable du VISA-P et d'en évaluer ses propriétés psychométriques. Matériel et méthode La traduction et l’adaptation interculturelle du VISA-P ont été réalisées selon les recommandations internationales (Guidelines for the Process of Cross-Cultural Adaptation of Self-Report Measures). Ce processus s'est déroulé en 6 étapes : traductions initiales, synthèse des traductions, traduction de retour vers la langue d’origine, comité expert, test de la version pré-finale et approbation du comité expert. La version française finale obtenue fut ensuite l’objet d’une évaluation de certaines propriétés psychométriques telles que la fidélité test-retest, la cohérence interne, la validité de construit et les effets plancher et plafond. Nonante-deux sujets furent recruté au total afin de tester ces propriétés psychométriques. Trois groupes de sujets furent utilisés pour répondre conjointement aux VISA-P et à un questionnaire supplémentaire, le Medical Outcomes Survey Short Form 36 questionnaire (SF-36) pour la validité de construit : un groupe de sujets pathologiques principalement recrutés parmi les patients du Centre Hospitalier Universitaire de Liège (28), un groupe de sujets asymptomatiques (22) et un groupe de sportifs à risque recrutés dans divers clubs sportif (42). L'ensemble des participants ont été recrutés au sein de la province de Liège. Résultats Aucun sujet ne présenta de grosses difficultés à comprendre le questionnaire suite au test de la version pré-finale. Les différents membres du comité expert se montrèrent satisfait de la version finale et donnèrent donc leur approbation. La moyenne des scores obtenu est de 53 (± 17) pour le groupe pathologique, 99 (± 2) pour le groupe sain et 86 (± 14) pour le groupe à risque. Les corrélations entre le VISA-P et certaines mesures divergentes du SF-36 semblent donner des résultats faibles. Les coefficients de corrélation mesurés entre les scores du VISA-P et les items convergents du SF-36 paraissent être élevés. Aucun effet plancher ou plafond n'a pu être observer lors de l'évaluation des propriétés psychométriques du VISA-P dans le groupe pathologique. Conclusion La version française du VISA-P est donc être un questionnaire compréhensible, fiable et adapté aux patients francophones souffrant d'une tendinopathie patellaire supérieur. [less ▲]

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See detailExperimental evidence and numerical prediction of nonlinear modal interactions in a real-life aerospace structure
Renson, Ludovic ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the ISMA 2014 conference (2014, September)

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably ... [more ▼]

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably because their analysis is regarded as impractical. The objective of the present contribution is to show that there now exists experimental and numerical methodologies which can deal with nonlinear phenomena in real-life structures. Specifically, this study investigates nonlinear modal interactions evidenced during the qualification campaign of the SmallSat spacecraft developed by EADS-Astrium. The ability to understand and reliably predict such interactions is of utmost importance as they may involve energy transfer between modes and, in turn, jeopardise the structural integrity. The paper proceeds in two steps, leading to great-fidelity reproductions of the experimental observations. In the first step, sine-sweep data collected during the qualification campaign are exploited to build a nonlinear computational model of the SmallSat with good predictive capabilities. To this end, the complete progression through nonlinearity detection, characterisation and parameter estimation is carried out by means of several techniques, such as the wavelet transform and the restoring force surface method. In the second step, the computational model is exploited through continuation algorithms to compute the nonlinear normal modes of the spacecraft and predict potential interactions. A very good agreement between experimental and numerical results is obtained for 2:1 interactions between modes with non-commensurate linear frequencies. [less ▲]

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See detailFlow and turbulence characterization as an onset for assessing the stability of gravel beds
Duma, Diana ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in 7th International Conference on Fluvial Hydraulics (2014, September)

The flow characteristics, such as velocity profiles and turbulence intensities, are of high practical relevance in the assessment of riverbed stability. So far, the Shields diagram remains the most widely ... [more ▼]

The flow characteristics, such as velocity profiles and turbulence intensities, are of high practical relevance in the assessment of riverbed stability. So far, the Shields diagram remains the most widely accepted approach for defining the initiation of sediment motion. However, it faces a number of shortcomings. In principle, it is only valid for uniform flow conditions and, under non-uniform flow conditions, it fails to account properly for the influence of turbulence in sediment entrainment. In this paper, we focus on a more detailed description of quasi-uniform and non-uniform flow characteristics in the vicinity of the critical flow conditions for inception of motion of gravel beds. Laboratory experiments were designed, involving two configurations. First, the entire bottom of the flume was paved with stones of uniform diameter (8 or 15 mm), leading to quasi-uniform flow conditions. Second, the flume bottom was smooth upstream of the zone of measurement while the downstream part was covered with gravels, leading to a sudden smooth-to-rough transition. The flow velocity was obtained by acoustic measurements and the turbulence intensity was calculated for both configurations. By fitting the velocity profile to a modified logarithmic law, the shear velocity was estimated. Standard approaches for predicting the threshold of motion, initially developed for uniform flows, were compared to other methods, based on depth-averaged turbulence kinetic energy, recently proposed in literature for non-uniform flow conditions. [less ▲]

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See detailImaging and understanding of iron ore granulation using X-ray mictrotomography
Evrard, Maxime ULg; Contreras, Rafael; Pirard, Eric ULg

Conference (2014, September)

Imaging and understanding of iron ore granulation using X-ray microtomography. Evrard M., Contreras R., Pirard E. Most iron ores cannot be directly fed into blast furnaces because their particle size ... [more ▼]

Imaging and understanding of iron ore granulation using X-ray microtomography. Evrard M., Contreras R., Pirard E. Most iron ores cannot be directly fed into blast furnaces because their particle size distribution will negatively impact the blast furnace permeability and hence the overall efficiency of the ore reduction process. The finest fraction (typ. < 6.3 mm) has to undergo a sintering process, wherein a mixture of iron ore, coke and flux (limestone, olivine,…) is heated, partially molten and transformed into pieces of sintered material with adequate size, porosity and strength characteristics to be fed into the blast furnace. The preparation of an adequate mixture involves a granulation process which is the subject of this study. Sintering and hence granulation of iron ores, is particularly important in Europe where iron ores show a downward trend in quality (finer particles, broader size range, lower grades with higher variability). In addition an increasing fraction of non-sintered material (return fines) is being added to the mix to optimize the resource efficiency while maintaining sinter quality. For most practitioners, microgranules (or micropellets) are considered as being composed of a nucleus (a particle in the range of 1 to 2 mm) surrounded by layers of the finest ore particles (typically the < 250 µm fraction). A series of experiments and 3D imaging tests have been performed in this study to better understand the granulation mechanisms. Microgranules are formed by mixing iron ore with water in a small rotating drum. Several parameters can be tuned during the granulation process: size and proportion of nucleating particles, size and proportion of fines, water addition, rotating speed, total duration,… Simple experiments using a single ore type (dominantly goethitic or hematitic) and water additions have been carried out systematically to better understand the kinetics of granulation. X-ray microtomography and subsequent 3D image analysis is used to identify and quantify the number of nuclei (when present), to measure the porosity and identify layering or cracks in the microgranule. Compared to previous studies on iron ore pellets (Farber et al. 2002; Shatokha et al. 2009; Shatokha et al. 2010), this work focuses on imaging prior to sintering. It also uses higher resolution micro-CT and definitely brings a better insight into granulation as compared to data from 2D imaging of polished blocks: less artefacts in apparent porosity due to sample preparation; good discrimination among components of the granule; clear identification of the nuclei; etc. This work is part of a larger European project (IMSIMI - Improved Sintering Mix) aiming at an optimal use of challenging input materials through carefully monitored preparation phases (mixing, granulation, etc.) and better understanding of their impact on the sintering process. Farber L., Tardos G., Michaels JN.,2002. Use of X-ray tomograzphy to study the porosity and morphology of granules. Powder Technology vol. 132, p 57-63. Shatokha V., Korobeynikov I., Maire E., Adrien J., 2009. Application of 3D X-ray tomography to investigation of structure of sinter mixture granules. Ironmaking and Steelmaking, vol. 36 (6), p 416-420. Shatokha V., Korobeynikov I., Maire E., Gremillard L., Adrien J.,2010. Iron ore sinter porosity characterisation with application of 3D X-ray tomography. Ironmaking and Steelmaking, vol. 37(5), p313-319. [less ▲]

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See detailFormal Incident Reporting System: Putting Solidarity on Trial
Rossignol, Nicolas ULg; Claisse, Frédéric ULg

Conference (2014, September)

The practice of “incident reporting” is commonly recognized as an effective mean to reduce the vulnerability of “at risk” socio-technical systems (e.g. nuclear plants, large industrial facilities or ... [more ▼]

The practice of “incident reporting” is commonly recognized as an effective mean to reduce the vulnerability of “at risk” socio-technical systems (e.g. nuclear plants, large industrial facilities or hospitals), as it allow the concerned community to learn from past incidents. Indeed, it is assumed that collective resilience will be upgraded via the use of institutionalized Incident Reporting System (IRS), enabling the organization to improve the quality of the actions and reactions in case of deviation from normality, or to prevent such deviation. Yet, inductive analysis of what happens with those IRS in practice are not numerous. In this paper, we address this gap and display the results of semi-structured interviews conducted in a nuclear facility. During those interviews, participants were also requested to produce a mind map of the IRS they are concerned with. As a result, we show that safety is a matter of solidarities that are situated in specific contexts. To that regard, incident reporting is a practice of decomposition and recomposition of trusts and thus of solidarities. Reporting incidents consists in putting solidarity on trial, as the collective safety was threatened. We show that such open trial is often avoided because questioning solidarities is not always desirable in order to allow the group to continue functioning. Overall, we argue that informal reporting behaviors can also contribute to upgrade collective resilience without putting solidarities on trial. [less ▲]

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See detailLes objectifs de la formation des soignants en Education Thérapeutique du Patient : une proposition
Pétré, Benoît ULg; Guillaume, Michèle ULg; LEGRAND, Catherine et al

Conference (2014, September)

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See detailDetection of Angiostrongylus vasorum in the bronchoalveolar lavage fluid or faeces of coughing and healthy dogs in Belgium.
Canonne-Guibert, Morgane ULg; Roels, Elodie ULg; Caron, Yannick ULg et al

in Proceedings of the 24th Ecvim Meeting, Mainz, Germany - 4-6 September 2014 (2014, September)

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See detailAsteroseismology of evolved stars: from hot B subdwarfs to white dwarfs
Van Grootel, Valérie ULg; Fontaine, G.; Charpinet, S. et al

Conference (2014, September)

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See detailHow to check analytically the robustness of a building submitted to a column loss - A premiere
Huvelle, Clara ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Proceedings of Eurosteel 2014 conference (2014, September)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to Eurocodes and some ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to Eurocodes and some other national design codes, the structural integrity of civil engineering structures should be guaranteed through appropriate measures and one way to guarantee it is to ensure an appropriate robustness of the structure, which may be defined as the ability of a structure to remain globally stable in case of exceptional event leading to local damages. However, although global design approaches are provided in modern codes and standards, no easy-to-apply practical guidelines are provided. The present paper reflects recent researches realised at the University of Liege with the scope of proposing such practical guidelines for the activation of alternative load path in the structure, design strategy generally leading to the most economical solutions. [less ▲]

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See detailComparaison du VeinoPlus Sport et du TENS sur la récupération de jeunes footballeurs
God, Maxime; LE GOFF, Caroline ULg; Evrard, Frédéric et al

in 7ème Congrès National SFMES & SFTS 2014 (2014, September)

Introduction : Toute activité physique fatigue l’organisme ; les muscles produisent des métabolites et de d’acide lactique, limitant leur fonctionnement. Il est donc nécessaire de pouvoir récupérer de ... [more ▼]

Introduction : Toute activité physique fatigue l’organisme ; les muscles produisent des métabolites et de d’acide lactique, limitant leur fonctionnement. Il est donc nécessaire de pouvoir récupérer de manière efficace au plus vite. En effet, une mauvaise récupération porte préjudice à la performance et à l’état physique du sportif. Aux côtés de la récupération active et de la balnéothérapie de nouvelles techniques comme de la cryothérapie et électrostimulation ont fait leur apparition pour une meilleure récupération. Le but de cette étude était de comparer l’impact de 2 types de stimulateurs : « VeinoPlus Sport » (VPS) et « TENS » sur la récupération des footballeurs amateurs après un effort de type Yo-Yo. Matériel et méthode : Dans un contexte identique, chaque sportif (20 footballeurs; âge moyen = 17,1 ans ± 0,79) a bénéficié du VPS ou du TENS lors de 2 séances différentes après 2 efforts de type Yo-Yo, séparés d’une période de récupération. Quatre prélèvements sanguins (lactate, gaz sanguins, ions, marqueurs cardiaques…) ainsi qu’un évaluation de l’explosivité par Myotest ont été réalisés respectivement avant l’épreuve, juste après, après la récupération et après la seconde épreuve. Un questionnaire relatif à l’état de fatigue a également été rempli par les sujets. Pour l’analyse statistique, nous avons utilisé le logiciel « StatPlus » et réalisé une Anova à mesures répétées ainsi qu’un test de Scheffé. Résultats : Les sportifs ont tous parcouru une plus grande distance lors des 2èmes efforts, surtout au sein du groupe VPS, mais sans différence significative. L’épreuve a déclenché une variation significative de lactatémie, du HCO3- ainsi que de la myoglobine. L’étude des autres paramètres sanguins ainsi que des paramètres de l’explosivité n’a révélé aucune évolution significative tout au long de l’étude. Par contre en ce qui concerne les critères subjectifs (« ressenti »), les footballeurs du groupe VPS ont noté, à 12h et 24h, une moindre douleur aux jambes, une moindre sensation de fatigue, une moindre diminution de la force, une plus grande légèreté ainsi qu’un meilleur état de forme par rapport au groupe TENS. Enfin, en général, et sans noter de préférence particulière pour l’un ou l’autre des appareils, les athlètes ont préféré l’utilisation de l’électrostimulation à leur récupération habituelle. Conclusion : Cette étude ne montre que des différences mineures, non significatives, entre les deux appareils. Les 2 groupes ont parcouru une distance plus grande lors du 2ème effort. Ceci suggère que le test n’était pas épuisant, malgré les signes biologiques de « fatigue ». Cependant, sur des critères subjectifs de récupération et de bien–être, une tendance était en faveur du VPS. Ces résultats seront à prendre en compte pour de nouvelles études avec cette fois des tests plus fatigants. [less ▲]

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See detailSelecting job candidates who have a propensity to exhibit change-oriented organizational citizenship behaviour.
Lothe, Benoit ULg; Hansez, Isabelle ULg

Conference (2014, September)

Purpose An abundant literature indicates that Organizational Citizenship Behaviours (OCBs) positively influence a number of important organizational outcomes. Furthermore, research is needed on the topic ... [more ▼]

Purpose An abundant literature indicates that Organizational Citizenship Behaviours (OCBs) positively influence a number of important organizational outcomes. Furthermore, research is needed on the topic of assessing and selecting applicants who have a propensity to exhibit OCB (Organ & al., 2010). Some of these behaviours are truly important to enable organization to adapt and “to make constructive changes in the work and task environment” (Choi, 2007, p.468). Examples include Voice, a challenging dimension of OCB (Dominguez & al., 2013), and Sportsmanship, that facilitate the change by reducing the diversion of resources in trivial matters (Organ & al., 2006). This exploratory study provides empirical evidence about using Situational Judgment Tests (SJTs) for identifying applicants who have a propensity to exhibit change oriented OCB. Method Two SJTs were developed to comply with OCBs assessment. The OCBs framework includes behaviours relating to organizational adaptation (sportsmanship) and change (voice). OCBs were concurrently collected using self-reported measurement scales. Data were collected from 220 white collars and 139 university students through an online survey. Results Significant correlations were found between the SJT scores and overall OCB ratings. More specifics findings provided substantial evidence for the concurrent validity of the SJTs to measure change-oriented sub-dimensions of OCBs. Conclusions Researches on techniques to predict OCBs are scarce and this study is the first to address the development and validation of a SJT for the assessment of affiliative and challenging dimensions of OCBs. [less ▲]

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See detailLe test conflictuel - un colosse aux pieds d'argile?
Wautelet, Patrick ULg

Conference (2014, September)

Cette présentation a servi de support à une communication tendant à faire le point sur l'article 27 du Code de droit international privé. La communication avait comme objectif de démontrer les difficultés ... [more ▼]

Cette présentation a servi de support à une communication tendant à faire le point sur l'article 27 du Code de droit international privé. La communication avait comme objectif de démontrer les difficultés du régime actuel d'accueil en Belgique des actes étrangers en Belgique et à formuler des pistes de solution pour améliorer ce régime. [less ▲]

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See detailCortical excitability dynamics of during sleep deprivation set PVT performance
Borsu, Chloé; Gaggioni, Giulia ULg; Ly, Julien ULg et al

Poster (2014, September)

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See detailHow to check analytically the robustness of a building submitted to a column loss - A premiere
Huvelle, Clara ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Proceedings of Eurosteel 2014 conference (2014, September)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to Eurocodes and some ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to Eurocodes and some other national design codes, the structural integrity of civil engineering structures should be guaranteed through appropriate measures and one way to guarantee it is to ensure an appropriate robustness of the structure, which may be defined as the ability of a structure to remain globally stable in case of exceptional event leading to local damages. However, although global design approaches are provided in modern codes and standards, no easy-to-apply practical guidelines are provided. The present paper reflects recent researches realised at the University of Liege with the scope of proposing such practical guidelines for the activation of alternative load path in the structure, design strategy generally leading to the most economical solutions. [less ▲]

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See detailMeasurement uncertainty for persistent organic pollutants by isotope dilution mass spectrometry
Eppe, Gauthier ULg; Diletti, G; Fernandes, A et al

in Organohalogen Compounds (2014, September), 76

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See detailAdaptation interculturelle et validation du questionnaire VISA-A en français
Oppong-Kyei, Julian; Bruyère, Olivier ULg; Delvaux, François ULg et al

in 7ème Congrès National SFMES & SFTS 2014 (2014, September)

Introduction La tendinopathie d’Achille, dont la discipline athlétique implique une grosse activité de course à pied, représente une source de douleurs et de handicap. Cette pathologie fait actuellement l ... [more ▼]

Introduction La tendinopathie d’Achille, dont la discipline athlétique implique une grosse activité de course à pied, représente une source de douleurs et de handicap. Cette pathologie fait actuellement l'objet de nouvelles découvertes sur le plan de la physiopathologie permettant l'exploration de nouvelles pistes thérapeutiques. Dans le cadre de telles études, des échelles d’évaluation sont utilisées afin d'évaluer des phénomènes subjectifs ou complexes tels la douleur, la qualité de vie, le handicap, etc. Elles sont généralement composées de plusieurs items dont la cotation est combinée en un score global ou des sous scores dimensionnels. La majorité des échelles algo-fonctionnelles sont développés dans des pays anglophones et sont par conséquence uniquement pertinents pour des sujets parlant l’anglais. Ceci est la cas pour le Victorian Institute of Sports Assessment–Achilles (VISA-A), un questionnaire développé dans le but d'évaluer la sévérité des symptômes de la tendinopathie achilléenne. L’intérêt de ce mémoire est donc de valider une version française fiable de ce questionnaire. Matériel et méthode La traduction et l’adaptation interculturelle du VISA-A ont été réalisées selon les recommandations internationales (Guidelines for the Process of Cross-Cultural Adaptation of Self-Report Measures). Ce processus s'est déroulé en 6 étapes : traductions initiales, synthèse des traductions, traduction de retour vers la langue d’origine, comité expert, test de la version pré-finale et approbation du comité expert. La version française finale obtenue fut ensuite l’objet d’une évaluation de certaines propriétés psychométriques telles que la fidélité test-retest, la cohérence interne, la validité de construit et les effets plancher et plafond. Pour ces évaluations, 116 sujets furent recruté et répartis en 3 groupes : un groupe de sujets pathologiques principalement recrutés parmi les patients du Centre Hospitalier Universitaire de Liège (31), un groupe de sujets asymptomatiques (22) et un groupe de sportifs à risque (63). Tous ces sujets durent également répondre à un questionnaire supplémentaire, le Medical Outcomes Survey Short Form 36 questionnaire (SF-36) pour la validité de construit. L'ensemble des participants ont été recrutés au sein de la province de Liège. Résultats Aucun sujets ne présenta de difficultés à comprendre le questionnaire suite au test de la version pré-finale. Les différents membres du comité expert se montrèrent satisfait de la version finale et donnèrent donc leur approbation. La moyenne des scores obtenus dans le groupe pathologique est de 59 (± 18), celle du groupe sain est de 99 (± 1) et celle du groupe à risque est de 94 (± 7). Aucun effet plancher ou plafond n'a pu être observer lors de l'évaluation des propriétés psychométriques du VISA-A (dans le groupe pathologique). Les corrélations entre le VISA-A et certaines mesures divergentes du SF-36 semblent être faibles. Les coefficients de corrélation mesurés entre les scores du VISA-A et les items convergents du SF-36 paraissent être élevé. Conclusion La version française du VISA-A est donc être un questionnaire compréhensible, fiable et adapté aux patients francophones souffrant d'une tendinopathie d'Achille. [less ▲]

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See detailComparaison du VeinoPlus Sport et du TENS sur la récupération de jeunes footballeurs
God, Maxime; LE GOFF, Caroline ULg; Evrard, Frédéric et al

in 7ème Congrès National SFMES & SFTS 2014 (2014, September)

Introduction : Toute activité physique fatigue l’organisme ; les muscles produisent des métabolites et de d’acide lactique, limitant leur fonctionnement. Il est donc nécessaire de pouvoir récupérer de ... [more ▼]

Introduction : Toute activité physique fatigue l’organisme ; les muscles produisent des métabolites et de d’acide lactique, limitant leur fonctionnement. Il est donc nécessaire de pouvoir récupérer de manière efficace au plus vite. En effet, une mauvaise récupération porte préjudice à la performance et à l’état physique du sportif. Aux côtés de la récupération active et de la balnéothérapie de nouvelles techniques comme de la cryothérapie et électrostimulation ont fait leur apparition pour une meilleure récupération. Le but de cette étude était de comparer l’impact de 2 types de stimulateurs : « VeinoPlus Sport » (VPS) et « TENS » sur la récupération des footballeurs amateurs après un effort de type Yo-Yo. Matériel et méthode : Dans un contexte identique, chaque sportif (20 footballeurs; âge moyen = 17,1 ans ± 0,79) a bénéficié du VPS ou du TENS lors de 2 séances différentes après 2 efforts de type Yo-Yo, séparés d’une période de récupération. Quatre prélèvements sanguins (lactate, gaz sanguins, ions, marqueurs cardiaques…) ainsi qu’un évaluation de l’explosivité par Myotest ont été réalisés respectivement avant l’épreuve, juste après, après la récupération et après la seconde épreuve. Un questionnaire relatif à l’état de fatigue a également été rempli par les sujets. Pour l’analyse statistique, nous avons utilisé le logiciel « StatPlus » et réalisé une Anova à mesures répétées ainsi qu’un test de Scheffé. Résultats : Les sportifs ont tous parcouru une plus grande distance lors des 2èmes efforts, surtout au sein du groupe VPS, mais sans différence significative. L’épreuve a déclenché une variation significative de lactatémie, du HCO3- ainsi que de la myoglobine. L’étude des autres paramètres sanguins ainsi que des paramètres de l’explosivité n’a révélé aucune évolution significative tout au long de l’étude. Par contre en ce qui concerne les critères subjectifs (« ressenti »), les footballeurs du groupe VPS ont noté, à 12h et 24h, une moindre douleur aux jambes, une moindre sensation de fatigue, une moindre diminution de la force, une plus grande légèreté ainsi qu’un meilleur état de forme par rapport au groupe TENS. Enfin, en général, et sans noter de préférence particulière pour l’un ou l’autre des appareils, les athlètes ont préféré l’utilisation de l’électrostimulation à leur récupération habituelle. Conclusion : Cette étude ne montre que des différences mineures, non significatives, entre les deux appareils. Les 2 groupes ont parcouru une distance plus grande lors du 2ème effort. Ceci suggère que le test n’était pas épuisant, malgré les signes biologiques de « fatigue ». Cependant, sur des critères subjectifs de récupération et de bien–être, une tendance était en faveur du VPS. Ces résultats seront à prendre en compte pour de nouvelles études avec cette fois des tests plus fatigants. [less ▲]

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See detailBOLTED END-PLATE BEAM-TO-COLUMN JOINTS USING HAMMERHEAD BEAMS: Experimental tests and proposal of design guidelines
Demonceau, Jean-François ULg; Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September)

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See detailReflexive Introduction to the Categorisation of the European Countryside
Schmitz, Serge ULg

in Siljkovic, Zeljka; Cuka, Anita; Pejdo, Ana (Eds.) Contempory development of European rural areas, Book of Abstracts (2014, September)

At the end of the 20th century, French rural geographers used a simple typology that encapsulates three categories of the countryside: Thirty years later, we should probably add new categories ... [more ▼]

At the end of the 20th century, French rural geographers used a simple typology that encapsulates three categories of the countryside: Thirty years later, we should probably add new categories: “agricultural countryside”, “recreational countryside”, “residential countryside”, “greying countryside”, “countryside supplying energy”, “new peasantry countryside”, “Biosphere reserves” and pay attention to other perspectives such as natural and cultural heritage, water resources protection and ecological transition. The paper discusses these old and new types of countryside and underlines main challenges that countryside faces; it shows how sensitive the categorisation could be according to the level of analysis, the period of observation and the perspectives. [less ▲]

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See detailIntérêt d’une seconde infiltration de plasma riche en plaquettes dans le traitement des tendinopathies patellaires ?
Kaux, Jean-François ULg; Kaux, Jean-François ULg; Croisier, Jean-Louis ULg et al

in 7ème Congrès National SFMES & SFTS 2014 (2014, September)

Introduction : Des études cliniques ont évalué l’effet du plasma riche en plaquettes (PRP) dans le traitement de la tendinopathie patellaire. Même si une seule infiltration peut améliorer les symptômes du ... [more ▼]

Introduction : Des études cliniques ont évalué l’effet du plasma riche en plaquettes (PRP) dans le traitement de la tendinopathie patellaire. Même si une seule infiltration peut améliorer les symptômes du sportif dans cette indication, la majorité des études évaluent les effets de 3 infiltrations successives. Le but de notre étude était donc de comparer l’efficacité d’une et de 2 infiltrations (rapprochées) de PRP dans le cade de tendinopathies patellaires chroniques, rebelles aux traitements conservateurs. Matériel et méthode : Vingt sportifs souffrant de tendinopathie patellaire depuis plus de 3 mois ont été inclus et randomisés en 2 groupes, respectivement 1 ou 2 infiltrations de PRP (15 jours d’intervalle). Le PRP a été obtenu à l’aide d’une machine d’aphérèse permettant d’obtenir une concentration plaquettaire identique pour tous les sujets. Ils ont bénéficié ensuite d’une rééducation excentrique sous-maximale standardisée. Le suivi a été réalisé à l’aide d’une échelle visuelle analogique de la douleur, de scores algo-fonctionnels (IKDC et VISA-P), ainsi qu’un questionnaire « mode de vie » avant l’infiltration, 3 et 12 mois post-infiltration. Résultats: La concentration de PRP employée était la même au sein des 2 groupes (9x106/µL), et ne contenait pas d’érythrocyte ni de leucocyte. Au terme du suivi (1 an), les résultats montrent une amélioration des scores EVA dans les deux groupes et significative pour le groupe 1 (p=0,005). Les scores VISA-P et IKDC ont tous deux augmentés, significativement dans les deux groupes. Un sujet par groupe n’a pas repris d’activité physique tandis 67% ont repris le sport au niveau antérieur dans le groupe 1 et 78% dans le groupe 2. Conclusion: La comparaison entre 1 et 2 infiltrations rapprochées de PRP n’a pas permis de mettre en évidence de différence entre les 2 groupes sur un suivi d’un an. Une seconde infiltration rapprochée ne semble donc pas indiquée pour améliorer l’efficacité de ce traitement. Cependant, un suivi à plus long terme serait nécessaire. De même l’évaluation d’une seconde infiltration plus à distance (3 mois) de la première mériterait d’être explorée. [less ▲]

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See detailβ 5 tubulin and 15-protofilament microtubules appeared in supporting cells of the Corti’s organ during development in rodents
Renauld, Justine ULg; Thelen, Nicolas ULg; Johnen, Nicolas et al

Conference (2014, August 31)

A feature of the organ of Corti’s supporting cells is the presence of an abundant cytoskeleton which is mainly composed of microtubules. These supporting cells have also been shown to contain a minor ... [more ▼]

A feature of the organ of Corti’s supporting cells is the presence of an abundant cytoskeleton which is mainly composed of microtubules. These supporting cells have also been shown to contain a minor mammalian tubulin, the β5-tubulin [1], recently related as a biomarker for cancer outcome [2] and cell proliferation [3]. It was shown that a β-tubulin isoform can specified the microtubule architecture, such as the expression of the Moth β2 in the Drosophila testes imposed the 16 protofilaments (16pf) structure on the corresponding subset of Drosophila microtubules, which normally contain 13pf [4]. Moreover, supporting cell microtubules are formed by 15pf instead of the canonical 13, a unique fact among vertebrates [5]. Such a protofilament configuration has been observed in C. elegans’ neurons which are responsible for the mechanosensory sense of touch [6]. It was also shown that these 15pf microtubules were essential to the proper functioning of these mechanosensory neurons [6]. To determine the role of this particular tubulin in the auditory organ and its possible involvement in the formation of the unusual 15pf microtubules of supporting cells, we studied the spatiotemporal localization of β5-tubulin during development in rats from embryonic day 18 until P25 (25th postnatal day). We also analyzed the localization of β5-tubulin mRNA expression in the Corti’s organ. Then we examined the fine structure of microtubules at the electron microscope level. For these experiments, we used an early postnatal stage and a late postnatal stage. Our results showed that β5-tubulin, contrary to other β-tubulins, had a unique distribution in the cochlea. This β-tubulin appeared at a postnatal stage, before the opening of the Corti’s tunnel and being restricted to supporting cells, especially in pillar and Deiters cells,. The same localization of β5-tubulin mRNA was observed by in Situ Hybridization. Electron microscopy indicated further that Pillar and Deiters cells were composed by 15-protofilament microtubules at the late postnatal stage (P25). In conclusion, all these data strongly suggest that there is a relationship between the presence of β5-tubulin and 15-protofilament microtubules in the supporting cells of the auditory organ. Further studies are now needed to elucidate their role. [less ▲]

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See detailAmélioration des moyens d'existence durables. Une voie pour la durabilité des exploitations agricoles familiales de coton au Bénin
Assogba, Claude Gervais; Tossou, C. R.; Lebailly, Philippe ULg et al

Conference (2014, August 30)

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See detailAspects économiques de la filière du vermicelle de tolomane au Vietnam
Le Thi Long, Vy; Vu Dinh, Ton; Lebailly, Philippe ULg et al

Conference (2014, August 30)

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See detailL'agriculture de subsistance et de semi-subsistance en Roumanie
Dona, Ion; Burny, Philippe ULg

Conference (2014, August 30)

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See detailProblématique foncière chez les exploitants agricoles de la Province de Kirundo au nord du Burundi
Minani, Bonaventure; Rurema, Déo-Guide; Burny, Philippe ULg et al

Conference (2014, August 30)

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See detailThe effects of a Global Agricultural Policy on the smallholder farmers in ending hunger
Paveliuc-Olariu, Codrin; Burny, Philippe ULg

Conference (2014, August 30)

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See detailAccelerating Random Forests in Scikit-Learn
Louppe, Gilles ULg

Conference (2014, August 29)

Random Forests are without contest one of the most robust, accurate and versatile tools for solving machine learning tasks. Implementing this algorithm properly and efficiently remains however a ... [more ▼]

Random Forests are without contest one of the most robust, accurate and versatile tools for solving machine learning tasks. Implementing this algorithm properly and efficiently remains however a challenging task involving issues that are easily overlooked if not considered with care. In this talk, we present the Random Forests implementation developed within the Scikit-Learn machine learning library. In particular, we describe the iterative team efforts that led us to gradually improve our codebase and eventually make Scikit-Learn's Random Forests one of the most efficient implementations in the scientific ecosystem, across all libraries and programming languages. Algorithmic and technical optimizations that have made this possible include: - An efficient formulation of the decision tree algorithm, tailored for Random Forests; - Cythonization of the tree induction algorithm; - CPU cache optimizations, through low-level organization of data into contiguous memory blocks; - Efficient multi-threading through GIL-free routines; - A dedicated sorting procedure, taking into account the properties of data; - Shared pre-computations whenever critical. Overall, we believe that lessons learned from this case study extend to a broad range of scientific applications and may be of interest to anybody doing data analysis in Python. [less ▲]

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See detailComputational homogenization of cellular materials with propagation of instabilities through the scales
Nguyen, Van Dung ULg; Noels, Ludovic ULg

Conference (2014, August 29)

The aim of this work is to develop an efficient multi–scale finite element framework to capture the buckling instabilities in cellular materials. As a classical multi–scale computational homogenization ... [more ▼]

The aim of this work is to develop an efficient multi–scale finite element framework to capture the buckling instabilities in cellular materials. As a classical multi–scale computational homogenization scheme looses accuracy with the apparition of the macroscopic localizations resulting from the micro–buckling, the second–order multi–scale computational homogenization scheme1 is considered. This second–order computational framework is herein enhanced with the following novelties so that it can be used for cellular materials. First, at the microscopic scale, the periodic boundary condition is used because of its efficiency. As the meshes generated from cellular materials exhibit a large void part on the boundaries and are not conforming in general, the classical enforcement based on the matching nodes cannot be applied. A new method based on the polynomial interpolation2 without the requirement of the matching mesh condition on opposite boundaries of the representative volume element (RVE) is developed. Next, in order to solve the underlying macroscopic Mindlin strain gradient continuum of this second–order scheme by the displacement–based finite element framework, the treatment of high order terms is based on the discontinuous Galerkin (DG) method to weakly impose the C1-continuity3. Finally, as the instability phenomena are considered at both scales of the cellular materials, the path following technique is adopted to solve both the macroscopic and microscopic problems4. The micro–buckling leading to the macroscopic localization and the size effect phenomena can be captured within the proposed framework. In particular it is shown that results are not dependent on the mesh size at the macroscopic scale during the softening response, and that they agree well with the direct numerical simulations. [less ▲]

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