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See detailDynamic modeling and control strategy analysis of a micro-scale CSP plant coupled with a thermocline system for power generation
Dickes, Rémi ULg; Desideri, Adriano ULg; Bell, Ian ULg et al

Conference (2014, September 17)

Concentrated solar power systems are characterized by strong transients and require proper control guidelines to operate efficiently. In this context, a dynamic model of a 5 kWe solar ORC system is ... [more ▼]

Concentrated solar power systems are characterized by strong transients and require proper control guidelines to operate efficiently. In this context, a dynamic model of a 5 kWe solar ORC system is developed in the Modelica language to investigate the possible advantages of coupling a concentrating solar power system with a thermocline packed-bed storage. The models of the solar field, the thermocline storage and the ORC unit are described and integrated in the open-source ThermoCycle library. A first regulation strategy is proposed and implemented into a controller unit. Results of a three-day simulation using real meteorological data are finally analyzed and discussed. [less ▲]

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See detailNuclear Waste Management in Belgium: the place(less) of public participation
Parotte, Céline ULg

Conference (2014, September 17)

This presentation highlights the last reflections of the author on NWM in Belgium. It focuses on the new governance practices in Belgian nuclear waste management (NWM) from its ‘participatory turn’ in the ... [more ▼]

This presentation highlights the last reflections of the author on NWM in Belgium. It focuses on the new governance practices in Belgian nuclear waste management (NWM) from its ‘participatory turn’ in the late 1990s. Rather than praising (or rejecting) participation versus expert analysis, we make use of a theoretical and analytical framework in which the important dynamics for the analysis are ‘opening up’ and ‘closing down’ technological appraisals and commitments. Even though NWM agencies often plea for an integrative approach between experts analysis and participation, in practice this reveals itself rather complicated as both exercises are often kept separate. We address this separation and its consequences and we find that societal concerns remain subsumed in the technical options which have long been favoured by the Belgian agency. This taming of uncertainty may come at a high price, if it systematically reduces the scope of alternative options for governance intervention or if societal consultations ultimately appear like an instrument of legitimation of already-taken decisions. [less ▲]

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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 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 detailCrystallization behaviour of binary fat blends containing shea stearin as hard fat
Danthine, Sabine ULg; Delatte, S; Blecker, Christophe ULg et al

Conference (2014, September 15)

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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 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 detailDer Einfluss der Historischen Rechtsschule auf Belgien
Gerkens, Jean-François ULg

Conference (2014, September 12)

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See detailVenus III book: aeronomy of the upper atmosphere
Gérard, Jean-Claude ULg; Bougher, Stephen; Drossart, Pierre et al

Conference (2014, September 12)

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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 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 detailPREVENTION OF INCISIONAL HERNIA AFTER MIDLINE LAPAROTOMY FOR ABDOMINAL AORTIC ANEURYSM TREATMENT: A RANDOMIZED CONTROLLED TRIAL
Muysoms, F; Vierendeels, T; Huyghe, M et al

Conference (2014, September 11)

Background: The incidence of incisional hernias (IH) after open abdominal aortic aneurysm (AAA) repair is high. Prophylactic mesh augmentation (PMA) during laparotomy closure has been proposed in high ... [more ▼]

Background: The incidence of incisional hernias (IH) after open abdominal aortic aneurysm (AAA) repair is high. Prophylactic mesh augmentation (PMA) during laparotomy closure has been proposed in high-risk patients. Methods: A multicenter prospective randomized controlled study was conducted on patients undergoing elective repair of AAA through midline laparotomy (Clinical.Trials.gov: NCT00757133). In the study group a retro-muscular PMA was performed with a large-pore polypropylene mesh (Ultrapro™, width 7.5 cm). The primary endpoint was the incidence of IH at 24 months. Results: Between February 2009 and January 2013, 120 patients were recruited at 8 Belgian centers. Patients' characteristics at baseline were similar between the groups. Operative and postoperative characteristics showed no difference in morbidity or mortality. A highly significant reduction of IH incidence was found after PMA compared to conventional closure, respectively 0% (CI: 0 % - 5.5%) versus 27.6% (CI: 16.7% - 40.9%) (P<0.0001; Fisher's exact test). The estimated "freedom of IH" curves (Kaplan-Meier estimate) were significantly different across study arms (X2=18.93, P<0.0001; Mantel-Cox test). No adverse effects were observed, apart from an increased mean (SD) time to close the abdominal wall for PMA: 46.2 min (18.6) versus 29.6 min (18.5) (P<0.001; Mann-Whitney U test). Conclusion: Prophylactic retro-muscular mesh augmentation of a midline laparotomy in AAA patients is safe and effectively prevents the development of IH, with an extra time investment of 17 minutes. [less ▲]

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See detailThe temptation of violence : which effects of feelings of discrimiation and victimisation ?
Gavray, Claire ULg

Conference (2014, September 11)

A lack of personal and social recognition and negative interactions with social institutions and relations influence negatively youth's behaviours

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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 detailProdiginines: cell-death associated metabolites in Nature and Medicine
Rigali, Sébastien ULg

Conference (2014, September 09)

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See detailProbing the innermost regions of the beta Pic planetary system with near-infrared interferometry
Absil, Olivier ULg; Defrere, D.; Le Bouquin, J.-B. et al

Conference (2014, September 08)

In this talk, I will review the near-infrared interferometric view of the innermost regions (< 4 AU) around beta Pictoris. I will first present the results of VLTI/AMBER and VLTI/PIONIER observations ... [more ▼]

In this talk, I will review the near-infrared interferometric view of the innermost regions (< 4 AU) around beta Pictoris. I will first present the results of VLTI/AMBER and VLTI/PIONIER observations aiming to detect faint companions around beta Pic. These data sets allow us to exclude the presence of companions a few hundred times as faint as the central star at angular separations up to about 100 mas. The median sensitivity in our search region corresponds to a brown dwarf of about 30 Mjup at beta Pic's age. I will then discuss the search for hot circumstellar dust that we carried out with VLTI/PIONIER. Based on accurate squared visibilities obtained at short baselines, we have been able to identify the presence of resolved circumstellar emission with an integrated brightness amounting to about 1.4% of the stellar brightness in H band. The spectral shape of the detected excess across the H band is consistant with thermal emission and/or reflected light from hot dust grains located in the innermost regions of the planetary system, although forward scattering by dust grains located further away (but still within the PIONIER field-of-view, i.e., close to the line of sight) could also significantly contribute to the detected circumstellar emission. I will conclude with a brief discussion of the implications of these interferometric observations on our view of the planetary system architecture around beta Pic. [less ▲]

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See detailAging mechanisms in amorphous GeTe
Raty, Jean-Yves ULg; Zhang, wei; Luckas, Jennifer et al

Conference (2014, September 08)

We investigate the structure of amorphous GeTe using Density Functional Theory based Molecular Dynamics, using either the standard Generalized Gradient Approximation, or the more elaborate van der Waals ... [more ▼]

We investigate the structure of amorphous GeTe using Density Functional Theory based Molecular Dynamics, using either the standard Generalized Gradient Approximation, or the more elaborate van der Waals approximation that proves more accurate in this system. New insight is provided on the stability of homopolar GeGe bonds and tetrahedral Ge bonding, in relation with the resistance drift phenomenon, that is investigated experimentally using photothermal deflection spectroscopy experiments. [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 detailEconomical evaluation of feeding costs in pilot farms at grazing.
Lessire, Françoise ULg; Dufrasne, Isabelle ULg

Conference (2014, September 07)

Cette présentation montre la méthodologie de calcul des coûts alimentaires dans des fermes laitières au pâturage.Ce calcul nécessite l'évaluation de la quantité d'herbe présente dans la ration et l ... [more ▼]

Cette présentation montre la méthodologie de calcul des coûts alimentaires dans des fermes laitières au pâturage.Ce calcul nécessite l'évaluation de la quantité d'herbe présente dans la ration et l'évaluation du coût de production de celle-ci. La quantité d'herbeest estimée par différentes méthodes explicitées dans la présentation. [less ▲]

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See detailContent analysis of abstracts of communications of GP during congresses, a step forward.
Jamoulle, Marc ULg

Conference (2014, September 06)

Département universitaire de médecine générale. University of Liège. belgium marc.jamoulle@doct.ulg.ac.be Context To succeed to have an accepted communication in a congress is a quite challenging and time ... [more ▼]

Département universitaire de médecine générale. University of Liège. belgium marc.jamoulle@doct.ulg.ac.be Context To succeed to have an accepted communication in a congress is a quite challenging and time consuming process. The gathered knowledge will often remain an ephemeral work as more than 50% of abstracts of Wonca congresses never reach the step of publication. Despite the effort to publish online the abstracts of Wonca Europe congresses, those remain largely useless as they are not indexed. Medical Subject Headings (MeSH) are often recommended, but in fact they are not convenient to index family doctor’s works. Methods Following the seminal idea of the late Henk Lamberts, the author has proposed to index the abstracts of communications of GPs with ICPC while using the letter Q for indexation of non-clinical matters. The opening of the letter Q for coding Wonca 2007 abstracts has given rise to a proposal for a classification called Core Content Classification of General Practice (3CGP/FM). 3CGP encompasses 8 domains and a rag bag. The 8 domains are open in categories and subcategories. Remained dormant during several years the project kind of woke up in Portugal during the 2013 APMGF congress. Two congresses of the French association of teacher (CNGE 2013 & 2014) have been submitted to careful content analysis using the Atlas.ti software and ICPC and 3CGP as coding items. Results The analyze of 998 abstracts in Wonca 2007, 125 in APMGF Covilha 2013, 205 CNGE in Clermont 2013 and the ongoing process to code the CNGE Lille Nov. 2014 submitted abstracts has provoked the evolution of 3CGP and demonstrates the interest to combine ICPC and a non-clinical classification for indexing Family doctor’s work. Next phases of the projects will be to link 3CGP to Wonca dictionary definitions, to corresponding MeSH terms if any, and to edit the whole product in Protégé, the semantic web editor. Indeed, semantic knowledge technology is waiting for general practice and will permit indexing congresses automatically or in a helped way, rising to the need of knowledge management for the family medicine of the future. Discussion The collaboration of WICC will be asked for further work. [less ▲]

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See detailTeaching ethics of prevention while defining fields of activities in GP/FM, a success of WICC.
Jamoulle, Marc ULg

Conference (2014, September 06)

Teaching ethics of prevention while defining fields of activities in GP/FM, a success of WICC. Marc Jamoulle, Département universitaire de médecine générale. University of Liège. Belgium marc.jamoulle ... [more ▼]

Teaching ethics of prevention while defining fields of activities in GP/FM, a success of WICC. Marc Jamoulle, Département universitaire de médecine générale. University of Liège. Belgium marc.jamoulle@doct.ulg.ac.be Context When presented in Durham during the 1995 WICC workshop, the concept of quaternary prevention, born in 1986, has attracted the consensus of the whole audience. In 2003 it has been discretely published in the Wonca dictionary of general practice. Method Since this time, medicine has changed. The diffusion of knowledge and the sagacity of some researchers has shown that medicine could become dangerous for health. The concepts of overinformation, overdiagnosis, overtreatment and overscreening are now the bread and butter of numerous medical journals and the themes of numerous books and disputes throughout the world. Quaternary prevention encompasses all those domains and supersedes them by putting the relationships between patient and doctor at the center of the ethical reflection. Result WICC has been instrumental in the genesis and dissemination of the concept of quaternary prevention. This concept is now known and distributed worldwide under the acronym P4. Family physicians form interlinked P4 groups in various countries. It is the theme of many congresses and was propelled to the forefront of the recent Wonca Europe Congress. This concept could induce profound changes in the role of the family physician in health care. Moreover, the combination of the four definitions of prevention provided an amazing view of the activity of family physicians and could renew basic job description in GP / FM. [less ▲]

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See detailThe Paradox of Incentives: Scientific Impact and Societal Relevance of Academic Research in the Walloon Science System
MELON, Steve; Fallon, Catherine ULg

Conference (2014, September 06)

Bibliometric indicators might be inappropriate tools to evaluate public funded research whose aim is to deal with the socio-economic challenges endured by a nation. By the means of a bibliometric analysis ... [more ▼]

Bibliometric indicators might be inappropriate tools to evaluate public funded research whose aim is to deal with the socio-economic challenges endured by a nation. By the means of a bibliometric analysis (Web of Science, period 1981 – 2011 for Belgium) combined with qualitative material, it has been argued that the kind of research that is more likely to address societal issues (based on its language, its type of collaboration and its type of research) is the one with the least scientific impact as measured by bibliometric measurements. The outcome of this study helped us realise that there exists a paradox of incentives for academic researchers due to an inadequacy between the production of knowledge that address societal issues and its evaluation: (1) traditional evaluation methods do not produce enough incentives to address societal challenges and that (2) scientists are intensifying their effort to produce valuable results for their evaluation. [less ▲]

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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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See detailExperimental replication of Australian grinding stone implements
Hayes, Elspeth; Cnuts, Dries ULg; Fullagar, Richard et al

Conference (2014, September 05)

Introduction: Until recently, lithic tool-use experiments in Australia were dominated by flaked stone with relatively few studies of ground-stone. This paper reports on a workshop, during which tool-use ... [more ▼]

Introduction: Until recently, lithic tool-use experiments in Australia were dominated by flaked stone with relatively few studies of ground-stone. This paper reports on a workshop, during which tool-use experiments were designed to document the wear traces associated with grinding various materials, different processing techniques and sandstones of different hardness. The specific variables were selected to build a use-wear and residue reference library applicable to archaeological grinding implements proposed for detailed functional analysis. Materials/Methods: Experimental sandstone grinding implements were used primarily to process organic and inorganic materials, documented ethnographically. Other materials were processed to investigate characteristics of seeds that were unavailable locally. Upper and lower stones were used together to grind seeds and bone; and abrading stones were used to file bone, stone and wood, and to grate haematite. The experimental stones came from five geographic regions in Australia, each associated with the archaeological assemblages proposed for study. Usewear was sampled with polyvinyl siloxane peels, which were examined under a stereomicroscope and a metallographic microscope. Residues were extracted with two solvents (water and a tri-mixture of acetonitrile, ethanol and water), and subsequently mounted on slides and examined under transmitted light microscopy. The slide preparations were stained to highlight constituent plant and animal tissues. Results: The hardness/softness of the sandstone and the degree of grain cementation have a strong influence on the development and appearance of use-wear. On the hard sandstone, the processing time affected polish formation. Use-wear patterns were distinctive of the broad categories of processed material (seed, bone, stone, haematite and wood). Key use-wear features relating to activity and processed material are reflected in the degree of grain rounding and grain levelling, the presence of macroscopic surface striations and the occurrence of micro-fractures, polish and striations observed at high magnification. Residues included collagen and cellulose fibres, starch granules, phytoliths, resins, bone fragments and pigment crystals. As for use-wear, the residues were also distinctive of the broad categories of processed material. Staining was particularly useful to distinguish plant and animal tissues. Conclusions: The experiments provided insights into the wear formation on sandstones of different hardness and degree of cementation. Stained cellular structures provide a reliable basis for distinguishing the investigated plant and animal tissue subjected to mechanical damage, resulting from grinding and pounding. Studies are underway to further test the viability of residue identification on ethnographic specimens of varying ages, and experimental grinding stones greater than 30 years. The residue and usewear experiments build on previous studies and help form the basis of a systematic and collaborative use-wear and residue reference library for ground-stone tools in Australia. Future experiments will focus on the wider range of plant taxa processed by grinding and documented ethnographically. [less ▲]

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See detailConstruction d’une capitale : les ressources ligneuses exploitées pour le bâti bruxellois
Weitz, Armelle ULg; Charruadas, Paulo ULg; Cremer, Sarah et al

Conference (2014, September 04)

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See detailLes allergies alimentaires et le point sur l'oesophagite à éosinophiles
GADISSEUR, Romy ULg

Conference (2014, September 04)

Les allergies alimentaires et le point sur l'oesophagite à éosinophiles

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See detailMondialisation et enseignement des langues et des cultures
Defays, Jean-Marc ULg

Conference (2014, September 04)

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See detailTeaching Practices in Science: a Survey of Primary Teachers in the French Speaking Community of Belgium
Quittre, Valérie ULg; Meyer, Coralie; Monseur, Christian ULg

Conference (2014, September 04)

Since PISA 2000, the performance of 15 year-old students from French speaking Community of Belgium (FWB) in science is largely below the OECD average (OECD, 2002, 2004, 2007, 2010 and 2013). This low ... [more ▼]

Since PISA 2000, the performance of 15 year-old students from French speaking Community of Belgium (FWB) in science is largely below the OECD average (OECD, 2002, 2004, 2007, 2010 and 2013). This low level of performance is not really unexpected as it was already observed at grade 7 and grade 8 in TIMSS 1995 (Harmon, Smith & Martin, 1997). In mathematics and in reading, the average performance of the 15 year-olds do not significantly differ from the OECD mean. Can these differences in performance in comparison with the OECD means be partly attributed to the emphasis and importance of the respective intended and implemented curricula? Does the relative importance of science teaching differ between primary and secondary education? In this investigation, we make the assumptions that the problem already exists in primary education and persists in secondary education. Therefore, we will focus on primary education. Data will be mainly collected on opportunities to learn (OTL) for science education and on professional knowledge and teaching practices More precisely, these study intents to question teachers at grade 3 and grade 4 about their beliefs and practices in science. Do the primary teachers feel confident and comfortable with science knowledge and science teaching? What’s the effective learning time of our pupils in science? Can we identify patterns of teachers that current international research has shown to have a significant role in science education of pupils? [less ▲]

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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 detailVADOSE ZONE STUDIES AT AN INDUSTRIAL CONTAMINATED SITE: THE VADOSE ZONE MONITORING SYSTEM AND CROSS-HOLE GEOPHYSICS
Fernandez de Vera, Natalia ULg; Beaujean, Jean ULg; Jamin, Pierre ULg et al

Conference (2014, September 03)

In situ vadose zone characterization is essential to improve risk characterization and remediation measures for soil and groundwater contamination. However, most available technologies have been developed ... [more ▼]

In situ vadose zone characterization is essential to improve risk characterization and remediation measures for soil and groundwater contamination. However, most available technologies have been developed in the context of agricultural soils. Most of these methodologies are not applicable at industrial sites, where soils and contamination differ in origin and composition. In addition, they are applicable only in the first meters of soils, leaving deeper vadose zones with lack of information, in particular on field scale heterogeneity. To overcome such difficulties, a vadose zone experiment has been setup at a former industrial site in Belgium. Industrial activities carried out on site left a legacy of soil and groundwater contamination in BTEX, PAH, cyanide and heavy metals. The experiment involves the combination of two techniques: the Vadose Zone Monitoring System (VMS) and cross-hole geophysics. The VMS allows continuous measurements of water content at different depths of the vadose zone (Dahan et al., 2009). In addition, it provides the possibility of pore water sampling at different depths. The system is formed by a flexible sleeve installed in a slanted borehole (Fig. 1) and containing monitoring units along its depth (Fig. 2). The flexible sleeve contains three types of monitoring units in the vadose zone: Time Domain Transmissometry (TDT), which allows water content measurements; Vadose Sampling Ports (VSP), used for collecting water samples coming from the matrix; and the Fracture Samplers (FS), which are used for retrieving water samples from the fractures. Cross-hole electrical tomography measurements are carried providing detailed spatial patterns about electrical properties of the subsurface. Such properties are related with subsurface heterogeneities, water content and solute concentrations. Two VMS were installed on site, together with four vertical boreholes containing electrodes for geophysical measurements. The site has been monitored under natural recharge conditions during the summer, autumn and winter. Results show reactions in the soil at depths up to 6m as a consequence of rainfall infiltration and groundwater level fluctuations. In addition, the chemistry of the soil water changes with depth and water infiltration. Background images obtained from geophysical measurements show a highly conductive subsurface due to the lithologies and the high mineralization of the water in the vadose zone. The combination of cross-hole geophysics with the VMS has provided an effective tool for characterizing the chemistry and the structure of the vadose zone. [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 detailLes ruralités dans les politiques du vivant
Mormont, Marc ULg

Conference (2014, September 02)

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See detailTool use and hafting in the Middle Palaeolithic of North Africa: preliminary results of an on-going use-wear analysis on the Mousterian/Aterian assemblages of Ifri n’Ammar (Morocco)
Tomasso, Sonja ULg; Rots, Veerle ULg; Eiwanger, Josef

Conference (2014, September 02)

The rock shelter of Ifri n’Ammar has a remarkable stratigraphy with alternating Mousterian and Aterian occupations within more than 6 meters of sediments dated from MIS 6 to 5a. The stratigraphy ... [more ▼]

The rock shelter of Ifri n’Ammar has a remarkable stratigraphy with alternating Mousterian and Aterian occupations within more than 6 meters of sediments dated from MIS 6 to 5a. The stratigraphy attributed to the Middle-Palaeolithic is divided in two units, separated by a calcareous crust, where upper and lower Aterian occupations can be identified. Previous studies have characterised Aterian and Mousterian cultures on a typological and technological basis. Functional data on lithic industries from the Middle Palaeolithic in northern Africa is at present very scarce and detailed studies of the production, hafting and use of tools, particularly tanged pieces, have not yet been conducted. Preliminary results of an on-going use-wear analysis of Middle Palaeolithic stone tools from the site of Ifri n’Ammar will be presented. Both low and high magnifications are combined for examining the macro- and microscopic wear traces on the stone tools. The interpretation of the archaeological material is based on comparisons with an experimental reference collection. The long-term goal of the study is to understand how stone tools were used, whether hafted stone tools existed at the site and how these functional parameters compare to the typo-technological characteristics of the different assemblages and how they may have influenced assemblage variability. [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 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 detailTechnical variability into the Gravettian with tanged tools: new results from Belgium
Touzé, Olivier ULg; Flas, Damien; Pesesse, Damien

Conference (2014, September 01)

Located at the interface between the Paris and the Rhine basins and the more northern territories of Europe, Belgium yield several gravettian occupations, all of which are located in the southern half of ... [more ▼]

Located at the interface between the Paris and the Rhine basins and the more northern territories of Europe, Belgium yield several gravettian occupations, all of which are located in the southern half of the country. The work of M. Otte in the second part of the seventies permitted to inventory eight deposits attributable to the Gravettian, and more than twice sites delivering clues that also evoke this period (Otte, 1979). But the quality of the documentation doesn't always respond to its quantity. Indeed, the analysis of the data is frequently complicated by the antiquity of the excavations conducted in most gravettian sites. The stratified records in karst context are particularly affected by this situation, thus restraining studies on the gravettian chronology in Belgium. This overview is however partly counterbalanced by two open air deposits excavated during the second half of the XXth century, and which benefited of good condition of preservation as well as more modern excavation methods: Maisieres-Canal (de Heinzelin, 1973; Haesaerts & de Heinzelin, 1979) and Station de l'Hermitage (Straus et al., 2000). These two deposits have often been the object of comparisons highlighting their similarities, both in term of spatial establishment and in term of lithic industry. In fact, their lithic industries stand out by the presence of tanged tools, a typological marker usually associated with the early Gravettian of Western Europe, and also encountered in other Belgian sites, particularly in the Betche-aux-Roches cave in Spy recently studied by two of us (Pesesse & Flas, 2014). If Maisieres-Canal and Station de l'Hermitage might have been described as “sisters-sites” (Straus & Otte, 2000), the recent reappraisal of their lithic industries, henceforth lead us to nuance this proposal. Our communication will therefore be the opportunity to shed a crossed look on two of the main gravettian sites of Belgium in the light of renewed data on their lithic assemblages, data that we will furthermore compare to the last results obtained on the Gravettian of Spy. New elements of reflection will in particular be proposed on the variability of technical behaviours within the Belgian Gravettian with tanged tools, as well as on the causes that may be responsible for this variability. Haesaerts P., Heinzelin J. de, 1979 – Le site paléolithique de Maisières-Canal, Brugge : De Tempel (Dissertationes Archaeologicae Gandenses, XIX), 119 p. Heinzelin J. de, 1973 – L’industrie du site paléolithique de Maisières-Canal, Brussels : Royal Belgian Institute of Natural Sciences (Mémoires, 171), 63 p. Otte M., 1979 – Le Paléolithique supérieur ancien en Belgique, Brussels : Royal Museums of Art and History (Monographies d'Archéologie nationales, 5), 684 p. Pesesse D., Flas D., 2014 – Wich Gravettians at Spy ?, in : Rougier H., Semal P., (eds.), Spy Cave. State of 120 years of pluridisciplinary research on the Betche-aux-Rotches from Spy (Jemeppe-sur-Sambre, Province of Namur, Belgium), Brussels : Royal Belgian Institute of Natural Sciences. Straus L. G., Otte M., 2000 – Résumé et conclusions, in : Straus L. G., Otte M., Haesaerts P. (dir.), La Station de l’Hermitage à Huccorgne. Un habitat à la frontière septentrionale du monde gravettien, Liège : Université de Liège (E.R.A.U.L., 94), pp. 209-213. Straus L. G., Otte M., Haesaerts P. (dir.), 2000 – La Station de l’Hermitage à Huccorgne, Liege : University of Liege (E.R.A.U.L., 94), 229 p. [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 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 detailBash Tapa and its Environment. Third Millennium Pottery from the First Excavation Campaign.
Mas, Juliette ULg

Conference (2014, September)

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). The ... [more ▼]

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). The stratigraphical step trench excavated on the southern slope of the tell revealed six phases of occupation dating to the 3rd millennium BC, from the Ninevite 5 to the Early Dynastic III periods (ARCANE ETG 1 – 5). A first evaluation of the pottery material recovered in this operation revealed that there are different traditions represented at the site. In fact, while the material dated from the beginning of the Early Bronze Age is clearly related to the Northern tradition, the most recent 3rd millennium levels identified so far have provided us with pottery which could be connected to Central Mesopotamia, and more specifically to the Diyala region. This paper will give a first overview of 3rd millennium pottery from the two first campaigns of excavation at Bash Tapa, its links with the other regions of Near East and its significance for chronology. [less ▲]

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See detailElectrografting of acrylate monomer, versatile method for coatings and thin films technologies
Aqil, Abdelhafid ULg; Jérôme, Christine ULg

Conference (2014, September)

Among the high research activity in the area of surface modification, electrografting is a very powerful and effective technique. When conducted under appropriate conditions of solvent and cathodic ... [more ▼]

Among the high research activity in the area of surface modification, electrografting is a very powerful and effective technique. When conducted under appropriate conditions of solvent and cathodic potential, the electropolymerization of (meth)acrylic monomers results in the chemisorption of the polymer on the conducting surface. This one-step electrografting technique is very easily implemented, can be applied to a wide range of (semi)-conducting surfaces by keeping the same chemistry and requires commonly used, readily available (meth)acrylate monomers. The wide variety of acrylic monomers suitable for this process makes available a broad range of surface properties including bactericidal, superhydrophobic and proteins repellent coatings. Electrografted smart coatings able to respond to external stimuli are also of interest particularly for sensors and actuators. [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 detailSpectral mapping of the FUV Jovian aurora and electron energy distribution
Gérard, Jean-Claude ULg; Bonfond, Bertrand ULg; Grodent, Denis ULg et al

Conference (2014, September)

Observations have been made with the Hubble Space Telescope in the timetag mode using the STIS long slit. During the 40 min of the observations, the slit spatially scanned the polar regions to build ... [more ▼]

Observations have been made with the Hubble Space Telescope in the timetag mode using the STIS long slit. During the 40 min of the observations, the slit spatially scanned the polar regions to build spectral maps of the jovian aurora. The emission is composed of the HI Lyman-alpha line and the H2 Lyman and Werner bands. The shorter wavelengths are partly absorbed by the methane layer overlying the bulk of the auroral emission. Since the CH4 absorption cross section drastically drops above 140 nm, the longer wavelengths are not absorbed and the intensity directly reflects the precipitated energy flux carried by the electrons. Maps of the intensity ratio of the two spectral regions will be presented, together with the associated auroral electron energy. These values will be compared with those expected from current magnetosphere-ionosphere model. They will provide input into 3-D modeling of the auroral heat source into the high-latitude Jovian upper atmosphere. [less ▲]

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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 detailBIODIVERSITY AND REDOX CONDITIONS THROUGH THE PROTEROZOIC TAOUDENI BASIN OF MAURITANIA
Beghin, Jérémie ULg; Poulton, Simon; Gueneli, Nur et al

Conference (2014, September)

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See detailLiquid-liquid extraction design under uncertainty
Rüngeler, Bettina; Pfennig, Andreas ULg

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 detailTransfusion in aortic surgery
KOCH, Jean-Noël ULg

Conference (2014, September)

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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 detailWhat do parents in families living in poverty say about the care and education of very young children?
Pirard, Florence ULg

Conference (2014, September)

The conclusions of scientific research indicate that it is the children of families living in poverty that benefit most of using educational services and quality care (Leseman, 2009). However, these ... [more ▼]

The conclusions of scientific research indicate that it is the children of families living in poverty that benefit most of using educational services and quality care (Leseman, 2009). However, these families are underrepresented in public childcare services. This situation is also observed in Brussels-Wallonia Federation, a European region where the structure of service supply is divided. The low participation especially in childcare services (0-3 years) contrasts with the more general preschool attendance (3-6 years). A survey commissioned by the King Baudouin Fondation collected information about the expectations and experience of parents of children ages 0-6 years, Belgian and foreign-born, regarding the services, structures and initiatives for young children: perinatal services, ONE child consultation (Office of Birth and Childhood, a public institution responsible for developing birth and childhood policies), childcare services for children aged 0-3 years, preschool and school age child care. This study that covered 44 living in poverty in Brussels-Wallonia Federation reveals aspects of primary and secondary accessibility (Humblet, Laevers, 2013) : while the former concern access strico sensu, the latter reveals conditions to ensure that each family also feels welcomed. The study further sheds some light on the view of the families on the concept of co-education. In addition, we will present some methodological issues, such as the difficulties to include fathers in the study, both directly and indirectly (through the mothers). In contrast with this, mothers were very eager to express their opinions, when listened to. Finally we discuss implications for the professionalisation of the workforce. [less ▲]

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See detailEuropean ELITA ELTR multicenter survey on the management of bile duct during liver procurement, preservation and transplantation
MEURISSE, Nicolas ULg; MONBALIU, D; MUIESAN, P et al

Conference (2014, September)

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See detailApplication of X-ray microtomography to investigate the effect of raw material properties on the kinetics of iron ores granulation
Evrard, Maxime ULg; Contreras, Rafael; Pirard, Eric ULg

Conference (2014, September)

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides ... [more ▼]

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides iron ores, such as return fines and other recycled materials (dusts, mill scale, sludges), solid fuel (coke breeze or anthracite) and fluxes (limestone, lime, olivine, dunite or dolomite) (Ball, 1973). As it is necessary to maintain a consistent quality of the granules (size distribution, porosity, strength, etc.) despite of the varying iron ore origins, the question arises as to how the properties of the iron ore particles (size and shape) influence the granulation process. The granulation process is partly influenced by the characteristic of the feed and partly by the action of cohesive force inside the drum granulator (Newitt et al. 1958). The objective of this paper is to study the effect of raw material properties on the kinetics of iron ore granulation considering in particular the mechanisms ruling wet granulation for two iron ores and to know the factors which determine the texture, shape, porosity and mechanical strength of the granules. [less ▲]

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See detailTemperature management, statistical local results
KOCH, Jean-Noël ULg

Conference (2014, September)

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See detailElicitor screening to protect winter wheat against Septoria tritici Blotch: preliminary results
Le Mire, Géraldine ULg; Deleu, Magali ULg; Ongena, Marc ULg et al

Conference (2014, September)

Elicitors are plant immunity-triggering compounds which are currently considered as one of the most promising tools in agriculture for the induction of plant resistance to various diseases (Mejía-Teniente ... [more ▼]

Elicitors are plant immunity-triggering compounds which are currently considered as one of the most promising tools in agriculture for the induction of plant resistance to various diseases (Mejía-Teniente et al., 2010). By contributing to both economic and environmental performances of agroecosystems, they can help reducing the use of chemical inputs. Although some elicitor products are already available on the market, it appears that a variable efficiency in the field, along with an uneasy integration in the current legislation and agricultural strategies, make these tools difficult to use (Walters, Ratsep, & Havis, 2013). Besides these limitations, few elicitor treatments have yet been efficiently and specifically designed to protect crop plants such as wheat, which is grown and consumed worldwide, against major diseases threatening both their yield and quality. There is a strong need to better understand the mechanisms of induced resistance in plants and develop elicitor use in agriculture. A phD research is currently led in Gembloux Agro Bio-Tech to develop a method based on eliciting agents, tested in greenhouse and field conditions, to protect winter wheat against major diseases, namely Septoria tritici, Fusarium graminearum and Fusarium culmorum. This project focuses on the screening of a large number of elicitors from different origins and structures. In 2014, we focused the first screening experiments on the protection of wheat against Septoria tritici Blotch (STB). Two winter wheat genotypes were tested: susceptible ‘Avatar’ and semi-resistant ‘Sy Epson’. Plants at 3-leaf stage were first sprayed till runoff with different concentrations of elicitors, and then inoculated 5 days later with a Septoria tritici spore suspension (106 spores mL-1) using a hand sprayer. Control plants were treated, prior to disease inoculation, with sterile water (negative control) or with BION® (ASM, Syngenta Europe; positive control). The disease severity and incidence were scored every 2 days for 28 days post-inoculation (d.p.i) by measuring the percentage of area covered with lesions and bearing pycnidia on the third leaf. The first results of these tests should enable a first discrimination of elicitors considering their dose-efficiency to reduce disease severity. After further screening of all the elicitors in hand, a determination of the elicitation pathways of the most efficient molecules tested will be undertaken. We intend to study the influence of various factors (i.e Temperature, relative humidity, plant development stage) on the elicitation potential and develop a formulation to be finally tested under field conditions. [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 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 detailMaster-narratives for science policy. The interplay of political discourses on Science in Wallonia.
Charlier, Nathan ULg

Conference (2014, September)

Both in Europe and in the United States, scientific research and science, technology and innovation (STI) policies have undergone profound changes for about thirty years. These transitions are often ... [more ▼]

Both in Europe and in the United States, scientific research and science, technology and innovation (STI) policies have undergone profound changes for about thirty years. These transitions are often framed along dichotomous lines : an ‘old regime’ characterized by strong public funding, independent academia and a linear conception of innovation has supposedly been replaced by a ‘new regime’ in which research and innovation are conceived in systemic terms, regarding their economic and societal relevance (Rip 2000). My proposal states that this conceptualization is of little use when it comes to studying the evolution of STI policies at the regional level. In this paper, I investigate how global master narratives like the “Knowledge-based Economy”, the “Grand societal Challenges”, “Science, the endless Frontier”, “Responsible Research and Innovation”, etc. are locally articulated, and thereby become grounded in regional STI policymaking, research, and innovation. These narratives, as explanatory resources and mobilizing resources, provide stakeholders with different visions; they are related to power relations between groups and individuals, to institutional settings and to policy trajectories. In my contribution, I study the four narratives in context; i.e. in different situated discourses of STI stakeholders. I consider multiple issues: who is telling what, to whom, why, when, where, and in which form. Instead of dichotomizing, investigating the evolutions of STI policies with a narrative framework provides an enriched description for complex local situations, towards a more political reading of the transitions. [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 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 detailResidue and microwear analyses of the stone artefacts from Schöningen
Rots, Veerle ULg; Hardy, Bruce

Conference (2014, September)

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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 detailRetrospective study of ventilation after major aortic surgery
KOCH, Jean-Noël ULg

Conference (2014, September)

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See detailJupiter's equatorward auroral features : Possible signature of magnetospheric injections
Dumont, Maïté ULg; Grodent, Denis ULg; Radioti, Aikaterini ULg et al

Conference (2014, September)

We investigate the characteristics of ultraviolet auroral features located equatorward of the main emission appearing in the Hubble Space Telescope (HST) images obtained in 2000-2007. Several properties ... [more ▼]

We investigate the characteristics of ultraviolet auroral features located equatorward of the main emission appearing in the Hubble Space Telescope (HST) images obtained in 2000-2007. Several properties of the auroral emissions are analyzed. The mapped radial position and System III longitude of the observed auroral features are in good agreement with those of the injections observed in the equatorial plane by Galileo. Finally, we discuss the processes causing auroral signatures of injections. This comparative study demonstrates that the structures under study are most probably related to magnetospheric injections and sheds light to the mechanism involved in the magnetosphere-ionosphere dynamics. [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 detailClassical analogy for the deflection of flux avalanches by a metallic layer
Silhanek, Alejandro ULg

Conference (2014, August 31)

Sudden avalanches of magnetic flux bursting into a superconducting sample undergo deflections of their trajectories when encountering a conductive layer deposited on top of the superconductor. Remarkably ... [more ▼]

Sudden avalanches of magnetic flux bursting into a superconducting sample undergo deflections of their trajectories when encountering a conductive layer deposited on top of the superconductor. Remarkably, in some cases the flux is totally excluded from the area covered by the conductive layer. We present a simple classical model that accounts for this behaviour and considers a magnetic monopole approaching a semi-infinite conductive plane. This model suggests that magnetic braking is an important mechanism responsible for avalanche deflection. [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 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 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 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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Peer Reviewed
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 detailZoroastre dans "Les Mages hellénisés". Portrait illusoire d'une sagesse barbare.
Swennen, Philippe ULg

Conference (2014, August 29)

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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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See detailPolyplex based on polycarbonate polymesr for an efficient delivery of an anti-angiogenic siRNA
Frère, Antoine ULg; Tempelaar, Sarah; Peixoto, Paul ULg et al

Conference (2014, August 28)

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See detailCrisis and post-crisis. Looks and contributions of Geography
Merenne-Schoumaker, Bernadette ULg

Conference (2014, August 28)

The presentation hinges on a double approach: to provide a brief overview of the notion of crisis in geographic works (mainly French-speaking) and then show how geography classes help to understand ... [more ▼]

The presentation hinges on a double approach: to provide a brief overview of the notion of crisis in geographic works (mainly French-speaking) and then show how geography classes help to understand economic crises through two particularly interesting approaches: the mapping of certain crisis indicators and the analysis of changes in productive systems. While geographers have generally favoured global dynamics and changes rather than crises, which are merely breaking points or bifurcation points, their work unequivocally allows us to take into account the spatial aspects of crises and their impacts, either thanks to mapping, or by studying the relations between economy, societies and land. Hence, geography classes are indeed complementary to economics classes. [less ▲]

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