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See detailSoil fiction: the experience of a neglected urban thing
Meulemans, Germain ULg

Conference (2016, July 21)

This paper starts with the story of the Soil Fiction project – a residence in which artists, anthropologists and a soil-scientist worked together on developing an exhibition on urban soils – in order to ... [more ▼]

This paper starts with the story of the Soil Fiction project – a residence in which artists, anthropologists and a soil-scientist worked together on developing an exhibition on urban soils – in order to address what speculative realism might bring to anthropological modes of inquiry. For more than 150 years, urban soils were left unnoticed by modern science because of their messiness and boundedness with human activities. Yet, they are a prevalent aspect of urban conditions of life. Through six months of collective work, Soil Fiction explored some of the neglected paths that attach us to urban soils. Departing from attempts to adapt modern-day science to urban soils, it imagined the practices of a minor science developed through a journey along them. These practices were given consistence through the creation of installations and films. Drawing on Stengers’s approach to speculative thinking, I discuss the importance of inventing propositions that work as ‘lures for feelings’. In this, rather than being a figment of the imagination, the craft of speculative imagining can attract experience. Fiction and exhibition making become ways to inquire into the world, to intensify hypothesis, and to forge other relationships with the world. I conclude that imaginative experiments such as Soil Fiction are not only knowledge practices in themselves, but also add more reality to the world. Responding to Ingold’s call for an anthropology that re-unites imagination and reality together, they conjure up research modes that do not discriminate between soils and our knowledge of them. [less ▲]

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See detailIntegrating biological indicators in a monitoring network to improve soil quality diagnosis – a case study in Southern Belgium
Krüger, Inken ULg; Chartin, Caroline; van Wesemael, Bas et al

Conference (2016, July 21)

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See detailenseigner massivement la littérature jeunesse : la Formation en Ligne Ouverte à tous de l'Université de Liège
Centi, Valérie; D'Anna, Vincianne; Delbrassine, Daniel ULg et al

Conference (2016, July 20)

Detailed reference viewed: 12 (0 ULg)
See detailAlumina and zircon refractory ceramic molds fabrication by additive methods for metal alloys casting
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2016, July 19)

Traditional processes for the foundry molds fabrication need numerous and rather time consuming steps. These processes are not really adapted to small series or prototypes. The research project exposed in ... [more ▼]

Traditional processes for the foundry molds fabrication need numerous and rather time consuming steps. These processes are not really adapted to small series or prototypes. The research project exposed in this contribution proposes an alternative method combining the advantages of molding (free formulation of metal alloys, economy on material and on time of machining) with those of the additive processes (short steps between 3D-model and final product, very complex geometries available). For short series the selective laser melting process (SLM) allows the building of molds in a very short time compared to the traditional investment casting method. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of the casting defaults. In this presentation, molds built with alumina and zircon as raw materials will be presented. Two metallic alloys have been tested in order to validate alumina and zircon as mold materials; the first, AlCu4MgSi chosen as low melting point alloy reference and the second, stainless steel 316L, as high melting point alloy reference [less ▲]

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See detailLes représentations du français dans le sous-système éducatif anglophone du Cameroun: le regard des élèves de la filière Arts
Mouto Betoko, Christiane ULg

Conference (2016, July 19)

Avec l’entrée du Cameroun au Commonwealth of Nations d’une part, et, le rayonnement de la langue anglaise d’autre part, les Francophones, majoritaires au Cameroun, se ruent à l’apprentissage de l’anglais ... [more ▼]

Avec l’entrée du Cameroun au Commonwealth of Nations d’une part, et, le rayonnement de la langue anglaise d’autre part, les Francophones, majoritaires au Cameroun, se ruent à l’apprentissage de l’anglais. Cependant, le mouvement inverse n’est pas visible dans la communauté anglophone minoritaire. Toutefois, un nombre non négligeable d’élèves anglophones s’engagent à poursuivre l’apprentissage du français jusqu’à la fin de leur cursus secondaire. Pour comprendre les raisons de cet engagement, nous allons répondre aux questions telles que : quelle est l’image que ces élèves se font de la langue française ? À quels projets l’associent-ils? Quel est impact des médias dans leur rapport avec le français ? Quelle est la perception de la plus-value de l’apprentissage de cette langue ? Quel est l’intérêt de la prise en compte des représentations de ces élèves dans l’enseignement du French au Cameroun ? [less ▲]

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See detailStudy of Sn and Fe based electrode materials for Alkali-ion batteries by in situ Mössbauer spectroscopy
Mahmoud, Abdelfattah ULg; Sougrati, Moulay Tahar; Hermann, Raphaël ULg et al

Conference (2016, July 19)

Li-ion batteries are widely used for electrochemical energy storage, because of their high energy density and efficiency. The most significant challenges in the development of advanced Li-ion batteries ... [more ▼]

Li-ion batteries are widely used for electrochemical energy storage, because of their high energy density and efficiency. The most significant challenges in the development of advanced Li-ion batteries concern the electrode materials. Indeed, the electrodes properties critically determine the capacity, performance, and durability of alkali-ion batteries. In the past five decades, Mössbauer spectroscopy has been an important analytical technique for investigating the structural, magnetic and electronic properties of energy materials. Mössbauer spectroscopy allows simultaneous investigation of bulk and surface characteristics. It is a non-destructive technique that can follow the behavior of electrode materials during the reaction process in situ and operando [1]. Its high resolution enables the observation of all Mössbauer active phases and the measure of their relative quantities . Iron and tin containing materials are of considerable interest as electrode material for Li-ion batteries [2, 3]. In this presentation, we report in situ and operando measurements of new electrode materials based on Fe and Sn during electrochemical cycling by combining Mössbauer spectroscopy with complementary techniques (X-ray diffraction, magnetic measurements, impedance spectroscopy, etc.) to study and investigate the electrochemical behavior of the electrode materials. [less ▲]

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See detailLa logique de l'espace dans les stemmas de Lucien Tesnière
Mazziotta, Nicolas ULg

Conference (2016, July 19)

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See detailVariations lexicales dans la mise en prose de Barlaam et Josaphat
Lambert, Adélaïde ULg

Conference (2016, July 19)

La confrontation de la version anonyme en vers de Barlaam et Josaphat avec sa mise en prose, produite au XIIIe siècle, offre un point de vue privilégié sur la langue littéraire en prose, à l’aube de son ... [more ▼]

La confrontation de la version anonyme en vers de Barlaam et Josaphat avec sa mise en prose, produite au XIIIe siècle, offre un point de vue privilégié sur la langue littéraire en prose, à l’aube de son épanouissement. Parallèlement au retranchement d’épisodes entiers, le remanieur s’applique à conserver une étroite proximité avec la lettre de son modèle francien, et semble tendre vers un compromis entre fidélité au texte-source et intelligibilité du texte-cible. Ainsi, à côté de l’importation massive du matériau lexical et des structures syntaxiques du texte versifié, toutes ses interventions sont observables. Notre communication s’est focalisée sur un échantillon de neuf substitutions lexicales dont nous avons mesuré la fréquence et dont il s’agissait d’identifier les implications. En tant que témoins de l’actualisation linguistique du texte-source, ces variations (diachroniques et/ou diaphasiques) permettent d’améliorer la connaissance du vocabulaire de la mise en prose de Barlaam et Josaphat et de cerner avec plus de précision la sensibilité du remanieur à l’égard du lexique de sa source. [less ▲]

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See detailNeural correlates of memory for internal thoughts versus external stimuli experienced in natural settings
Stawarczyk, David ULg; Jeunehomme, Olivier ULg; D'Argembeau, Arnaud ULg

Poster (2016, July 19)

To investigate the brain regions supporting the remembrance of internal thoughts versus external events, we asked participants to perform a short walk while wearing a lifelogging device that continuously ... [more ▼]

To investigate the brain regions supporting the remembrance of internal thoughts versus external events, we asked participants to perform a short walk while wearing a lifelogging device that continuously and automatically took pictures. In a subsequent fMRI session, they were shown brief sequences of pictures from their walk and were asked to remember either external events or internal thoughts that they experienced while walking. Results showed that remembering internal thoughts activated the medial prefrontal cortex and temporal poles to a greater extent than remembering external events, whereas remembering external events was associated with higher activation in lateral frontoparietal regions. These findings suggest that memory for internal thoughts involves the reactivation of brain regions supporting the initial formation of these thoughts. [less ▲]

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See detailProbing single molecules with the AFM: Force, motion, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2016, July 18)

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See detailOn the organization of episodic future thoughts in event clusters
D'Argembeau, Arnaud ULg

Conference (2016, July 18)

Memory can be flexibly used to image events that might happen in one’s personal future, a capacity that has been referred to as episodic future thinking. In this talk, I will present data showing that ... [more ▼]

Memory can be flexibly used to image events that might happen in one’s personal future, a capacity that has been referred to as episodic future thinking. In this talk, I will present data showing that many episodic future thoughts are not represented in isolation, but instead are part of higher-order event clusters that organize imagined events in coherent themes and causal sequences. Personal goals seem to play an important role in this organization and neuroimaging evidence shows that event clusters recruit brain regions supporting conceptual and integrative processing. These findings suggest that episodic future thinking involves the integration of specific event representations with autobiographical knowledge, which contextualizes imagined events with respect to personal goals and general expectations about one’s life. [less ▲]

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See detailMetagenetics and predictive microbiology: a new tool to understand the kinetics of microbial subpopulations in Belgian white pudding
Cauchie, Emilie ULg; Gand, Mathieu; Kergourlay, Gilles et al

Poster (2016, July 18)

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See detailMetagenetics and predictive microbiology: a new tool to understand the kinetics of microbial subpopulation in minced pork meat
Cauchie, Emilie ULg; Delhalle, Laurent; Taminiau, Bernard et al

Poster (2016, July 18)

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See detailRecollection versus familiarity in normal aging and in mild cognitive impairment: Impact of test format.
Simon, Jessica ULg; Gilsoul, Jessica ULg; SALMON, Eric ULg et al

Poster (2016, July 18)

The aim of this study was to investigate the impact of test format on recollection and familiarity in normal aging and in MCI. Seventy young participants, 65 younger-old, 53 older-old, and 13 MCIs were ... [more ▼]

The aim of this study was to investigate the impact of test format on recollection and familiarity in normal aging and in MCI. Seventy young participants, 65 younger-old, 53 older-old, and 13 MCIs were presented with forced-choice and yes/no visual recognition memory tasks with the Remember/Know/Guess paradigm. The young people had better recognition performance than younger-old, who performed better than older-old and MCIs. Recollection and familiarity declined progressively in healthy aging. In MCI, recollection was more affected than familiarity, but patients demonstrated a more liberal use of familiarity. Finally, test format did not influence strongly the results. Young people used recollection more often in the forced-choice task compared to the yes/no task. [less ▲]

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See detailLe français pour l’unité et l’intégration nationales au cameroun
Mouto Betoko, Christiane ULg

Conference (2016, July 16)

La politique du bilinguisme officiel s’est imposée au Cameroun pour des raisons d’unité nationale suite à une double colonisation franco-britannique. En milieu scolaire, le bilinguisme renvoie ... [more ▼]

La politique du bilinguisme officiel s’est imposée au Cameroun pour des raisons d’unité nationale suite à une double colonisation franco-britannique. En milieu scolaire, le bilinguisme renvoie généralement à l’enseignement du français en tant que deuxième langue officielle aux Anglophones et, à l’enseignement de l’anglais en tant que deuxième langue officielle aux Francophones. Néanmoins, les élèves anglophones éprouvent d’énormes difficultés d’intégration à la fin des études secondaires. Quels sont donc les objectifs de l’enseignement du français aux élèves anglophones ? Quelle est l’approche méthodologique mise en œuvre pour atteindre ces objectifs ? Et enfin, comment allier objectifs scolaires du bilinguisme et méthodologie du FLE pour préparer les élèves anglophones à la vie après le secondaire ? [less ▲]

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See detailOn the use of ROC curves in DIF simulation studies
Magis, David ULg; Tuerlinckx, Francis

Conference (2016, July 14)

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF ... [more ▼]

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF items relies on statistics based on pre-defined significance level or on pre-established cutoff values. DIF methods based on conceptually different approaches may therefore become incomparable in terms of summary DIF statistics such as false alarm rate or hit rate. The purpose of this talk is to overcome this analytic issue by introducing receiver operating characteristic (ROC) curves in this context. ROC curves allow for global comparison of methods’ performances by computing pairs of (false alarm, hit) rates and representing them on a common scatter plot. Several summary ROC statistics can be considered for further analysis. The application of the ROC curve methodology, together with its limitation and possible extensions, is illustrated by a simple simulation study that compares three score-based DIF methods (Mantel-Haenszel, standardization and Delta plot). [less ▲]

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See detailOpen source programming: a new hope for psychometric research
Magis, David ULg

Conference (2016, July 14)

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore ... [more ▼]

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore require accurate, fast and stable implementation. To this regards, open source programming (such as in the R language) is a promising approach allowing for flexible implementation, data generation, replication of studies, and worldwide dissemination. The purpose of this talk is to illustrate how psychometrics and open source programming (with special emphasis on the R language) can interact and contribute to each other, by means of some selected examples. Several topics will be illustrated, among others: why open source programming is (to my opinion) as important as psychometric research; why we need for stable and complete implementation of psychometric and statistical routines for research purposes (for e.g., CAT); how accurate implementation of IRT routines can lead to unexpected theoretical results; why (and how) open source software can be valued as research output. Most examples will arise from the CAT framework and the R package catR for simulating CAT patterns. [less ▲]

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See detailExamine the effects of two adjustments to the lz statistic
Riley, Barth; Magis, David ULg

Conference (2016, July 14)

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two ... [more ▼]

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two adjustments to the standardized log-likelihood statistic (lz): (1) correction of the negatively skewed distribution of lz (Snijders, 2001), and (2) improving the sensitivity of the statistic by employing more accurate estimates of item response probability using symmetric functions (Dimitrov and Smith, 2006). Data were simulated using three test lengths (10, 20, 30 items). Data containing misfitting response patterns were simulated using three aberrant response patterns (cheating, guessing, and inattentiveness), and three levels of aberrance (i.e., proportion of item responses affected by misfit; 10%, 30% and 50%). Data containing no simulated misfitting response patterns were also generated for each test length. Non-misfitting responses were generated using the dichotomous Rasch measurement model. For each combination of independent variables, a dataset was generated consisting of 5,000 simulees. Four fit statistics were compared: lz, lz* (Snijders adjustment), lzSYM (Dimitrov and Smith adjustment), and lzSYM* (both adjustments). Mean Type I error rates were ≤ 0.1 across all conditions. The lz* statistic produced the best control of Type I error, which was often below the nominal Type I error rate, whereas the empirical Type I error rate for the unadjusted lz statistic most closely approximated the nominal rate. In contrast, lzSYM and lzSYM* yielded empirical Type I error rates larger than the nominal rate, with the discrepancy being particularly pronounced as the length of the test decreased. As might be expected, power to detect misfitting response patterns increased with test length and with the percentage of misfitting response patterns in the sample. Both lzSYM and lzSYM* evidenced improved power in detecting misfitting response patterns compared to lz and lz*, particularly for guessing response patterns and/or on shorter (i.e., 10 item) tests. [less ▲]

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See detailRoland Barthes et les écritures de la chronique
Stienon, Valérie ULg

Conference (2016, July 14)

La plupart des textes de Roland Barthes sont le produit d’une commande – qu’elle soit amicale, événementielle, éditoriale. L’inscription dans un genre ou l’investissement d’un mode d’écriture s’appuie ... [more ▼]

La plupart des textes de Roland Barthes sont le produit d’une commande – qu’elle soit amicale, événementielle, éditoriale. L’inscription dans un genre ou l’investissement d’un mode d’écriture s’appuie donc sur une situation de communication dont les paramètres sont souvent bien déterminés et qui est elle-même guidée par une demande préalable, de sorte que dispositif générique et horizon d’attente s’entre-déterminent de manière cruciale. Plus encore, les commandes passées à Barthes, avant d’être des livres, prennent généralement la forme d’articles dans des périodiques. Il y a de la sorte une dimension intrinsèquement circonstancielle à l’écriture barthésienne, dimension propice à la relation d’actualité. Dès lors, dans quelle mesure la chronique peut-elle offrir une clé de lecture du cheminement d’écriture de Barthes et du parcours de sa pensée ? [less ▲]

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See detailCharacterization of FRD3, a zinc and iron homeostasis actor in Arabidopsis relatives
Scheepers, Maxime ULg; Charlier, Jean Benoit; Spielmann, Julien ULg et al

Conference (2016, July 14)

Zinc and iron are two essential micronutrients for plants. The homeostasis networks of the two metals are intertwined. Arabidopsis halleri is a zinc- and cadmium-tolerant and zinc-hyperaccumulating ... [more ▼]

Zinc and iron are two essential micronutrients for plants. The homeostasis networks of the two metals are intertwined. Arabidopsis halleri is a zinc- and cadmium-tolerant and zinc-hyperaccumulating species, which also present adaptation of its iron homeostasis(1,4). Transcriptomic studies identified genes which are constitu-tively over-expressed in Arabidopsis halleri compared to Arabidopsis thaliana and which may have a role in metal tolerance or accumulation(2-4). Among them, a candidate gene encodes the FRD3 (FERRIC REDUCTASE DEFECTIVE 3) protein, a member of the MATE family of membrane transporters. FRD3 is a citrate transporter involved in iron homeostasis(5-7) and plays a role in zinc tolerance in A. thaliana(8). The FRD3 gene displays a complex regulation. In A. thaliana, alternative transcript initiation for FRD3 determines two transcripts, which dif-fer in their 5'UTRs and have differential translation efficiency. The two transcripts are selectively regulated under stress conditions: iron and zinc depletion, zinc excess or cadmium presence(9). In A. halleri, a single highly ex-pressed FRD3 transcript with high translation efficiency is present(9). We are further examining the FRD3 function in zinc and iron homeostasis in A. thaliana and A. halleri. We will present data (i) on the high expression of FRD3 in A. halleri, (ii) on the functional characterization of the two alternative FRD3 transcripts and their role in metal homeostasis in A. thaliana in comparison with the A. halleri FRD3 transcript and (iii) on the zinc phenotypes of the frd3 A. thaliana mutant. [less ▲]

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See detailOperational costs and externalities in optimal intermodal network design
Mostert, Martine ULg; Limbourg, Sabine ULg; Caris, An

Conference (2016, July 13)

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities ... [more ▼]

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities. The objective of this paper is to analyze at the strategic level how the flow repartition varies between three modes (road, intermodal rail and intermodal inland waterway) according to different implemented policies. A mathematical allocation model is developed and tested on the Belgian case study, in order to determine the observed changes between the single minimization of (operational or health-related external) costs and the introduction of additional road taxes. [less ▲]

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See detailShaping (im)mobility in border camps: a case study of the transformation of Calais camps and its actors
Da Silva, Amanda Carolina ULg

Conference (2016, July 13)

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the ... [more ▼]

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the implementation of a semi-permanent exclusion system based on the refugee crisis. I observe this issue as a result of a securitization process. The securitization apparatus (speech acts and policies), produced the immobility of a group. In the other hand actors will emerge to produce mobility. When a situation is defined as a crisis, atypical actions can be employed to protect the «political community». I started from the assumption that dialectic relation between securitization and camps actors had a high impact on the projects of refugees, and so long in their mobility. This is a question of integration policies at the local level. I aim to highlight the local level relevance, where the integration is primarily implemented, and therefore local and regional context should matter as much as the national model for integration (Martiniello, 2013). In Calais, due to the lack of immigrants policies, civilians associations started to react and build informal camps, but due to recent "crisis" the Stat concentrated all refugees in a single camp, 6 kilometers from the city center, called bidonville. [less ▲]

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See detailGamma-Ray Spectrometry: Experimental Measurement and Monte Carlo Simulation using GEANT4 toolkit
Guembou Shouop, Cébastien Joel ULg; Ndontchueng Moyo, Maurice; Chene, Grégoire ULg et al

Poster (2016, July 13)

Nowadays the precision in the measurement has become a challenge for physicists. That is why in recent decades, the interest is very granted to simulation. Since 1940, the method Monte Carlo is more ... [more ▼]

Nowadays the precision in the measurement has become a challenge for physicists. That is why in recent decades, the interest is very granted to simulation. Since 1940, the method Monte Carlo is more useful for validation and even for prediction of the results of the experiment. The aim of this study is to validate experimental models. Our laboratories are equipped with HPGe gamma spectrometers for measuring the natural radioactivity, it becomes interesting to compare and even to improve the performance of our system. Geant4 is used for the construction of the geometry of detection, the physics processes and the primary particles. First and prliminary result was prsented in this paper. [less ▲]

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See detailA Crypt of Swipes. Charles Burns Haunted by Tintin
Crucifix, Benoît ULg

Conference (2016, July 13)

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See detailThe Methods of Managgement: An Answer to the crisis
Robert, Jocelyne ULg

Conference (2016, July 12)

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See detailFailure multiscale simulations of composite laminates based on a non-local mean-field damage-enhanced homogenization
Wu, Ling ULg; Adam, Laurent; Doghri, Issam et al

Conference (2016, July 12)

A multiscale method is developed to study the failure of carbon fiber reinforced composites. In order to capture the intra-laminar failure, a non-local mean-field homogenization (MFH) method accounting ... [more ▼]

A multiscale method is developed to study the failure of carbon fiber reinforced composites. In order to capture the intra-laminar failure, a non-local mean-field homogenization (MFH) method accounting for the damage evolution of the matrix phase of the composite material [1] is considered. In that formulation, an incremental-secant MFH approach is used to account for the elastic unloading of the fibers during the strain softening of the matrix. In order to avoid the strain/damage localization caused by the matrix material softening, an implicit non-local method [2] was reformulated to account for the composite material anisotropy. As a result, accurate predictions of the composite softening behavior and of the different phases response is possible, even for volume ratios of inclusions around 60%. In particular it is shown that the damage propagation direction in each ply follows the fiber orientation in agreement with experimental data. The delamination process is modeled by recourse to a hybrid discontinuous Galerkin (DG)/ extrinsic cohesive law approach. As for the extrinsic cohesive law (ECL), which represents the fracturing response only, and for which cohesive elements are inserted at failure onset, the method does not suffer from a mesh-dependent effect. However, because of the underlying discontinuous Galerkin method, interface elements are present since the very beginning of the simulation avoiding the need to propagate topological changes in the mesh with the propagation of the delamination. Moreover, the pre-failure response is accurately captured by the material law though the DG implementation, by contrast to usual intrinsic cohesive laws. As a demonstration of the efficiency and accuracy of the method, a composite laminate with a quasi-isotropic sequence ([90/45/-45/90/0]S) and an open-hole geometry is studied using the multiscale method [3] and the results are compared to experimental data. The numerical model is found to predict the damage bands along the fiber directions as observed in the experimental samples inspected by X-ray computed tomography (XCT). Moreover, the predicted delamination pattern is found to match the experimental observations. REFERENCES [1] L. Wu, L. Noels, L. Adam, I. Doghri, An implicit-gradient-enhanced incremental-secant mean- field homogenization scheme for elasto-plastic composites with damage, International Journal of Solids and Structures, 50, 3843-3860, 2013. [2] R. Peerlings, R. de Borst, W. Brekelmans, S. Ayyapureddi, Gradient-enhanced damage for quasi-brittle materials. International Journal for Numerical Methods in Engineering, 39, 3391-3403, 1996. [3] L. Wu, F. Sket, J.M. Molina-Aldareguia, A. Makradi, L. Adam, I. Doghri, L. Noels, A study of composite laminates failure using an anisotropic gradient-enhanced damage mean-field homogenization model, Composite Structures, 126, 246–264, 2015. [less ▲]

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See detailMean-Field-Homogenization-based stochastic multiscale methods for composite materials
Wu, Ling ULg; Lucas, Vincent ULg; Adam, Laurent et al

Conference (2016, July 12)

When considering a homogenization-based multiscale approach, at each integration-point of the macro-structure, the material properties are obtained from the resolution of a micro-scale boundary value ... [more ▼]

When considering a homogenization-based multiscale approach, at each integration-point of the macro-structure, the material properties are obtained from the resolution of a micro-scale boundary value problem. At the micro-level, the macro-point is viewed as the center of a Representative Volume Element (RVE). However, to be representative, the micro-volume-element should have a size much bigger than the micro-structure size. For composite materials which suffer from a large property and geometrical dispersion, either this requires RVE of sizes which cannot usually be obtained numerically, or simply the structural properties exhibit a scatter at the macro-scale. In both cases, the representativity of the micro-scale volume element is lost and Statistical Volume Elements (SVE) [1] should be considered in order to account for the micro-structural uncertainties, which should in turn be propagated to the macro-scale in order to predict the structural properties in a probabilistic way. In this work we propose a non-deterministic multi-scale approach for composite materials following the methodology set in [2]. Uncertainties on the meso-scale properties and their (spatial) correlations are first evaluated through the homogenization of SVEs. This homogenization combines both mean-field method in order to gain efficiency and computational homogenization to evaluate the spatial correlation. A generator of the meso-scale material tensor is then implemented using the spectral method [3]. As a result, a meso-scale random field can be generated, paving the way to the use of stochastic finite elements to study the probabilistic behavior of macro-scale structures. [1] M. Ostoja-Starzewski, X.Wang, Stochastic finite elements as a bridge between random material microstructure and global response, Computer Methods in Applied Mechanics and Engineering, 168, 35–49, 1999. [2] V. Lucas, J.-C. Golinval, S. Paquay, V.-D. Nguyen, L. Noels, L. Wu, A stochastic computational multiscale approach; Application to MEMS resonators. Computer Methods in Applied Mechanics and Engineering, 294, 141–167, 2015. [3] Shinozuka, M., Deodatis, G. Simulation of stochastic processes by spectral representation. Appl. Mech. Rev., 1991: 44(4): 191-204, 1991. [less ▲]

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See detailArchitectural and Environmental Housing Typology Analysis in Huamachuco, Peru
Meliani, Houmam ULg; Teller, Jacques ULg; Attia, Shady ULg

in La Roche, Pablo; Schiler, Marc (Eds.) Passive and Low Energy Architecture Conference (2016, July 12)

This work focuses on the city of Huamachuco, a town 3200 meters above sea level in Northern Peru. The main aim of this study is to share and disseminate technological knowledge on architecture, building ... [more ▼]

This work focuses on the city of Huamachuco, a town 3200 meters above sea level in Northern Peru. The main aim of this study is to share and disseminate technological knowledge on architecture, building technology and lifestyle of Huamachuco inhabitants. The paper objective is to (1) highlight the concept of architectural quality in Huamachuco, (2) compare the living environment of existing traditional dwellings in comparison with newly constructed concrete dwellings, and to (3) identify the reasons for neglecting ecological construction technologies and materials in the new built environment. The research methodology went through different phases that range from qualitative data collection and quantitative measuring, to data analysis and findings reporting. Firstly, a typological study was conducted visiting 110 houses. The typological study enabled us to describe and understand the housing typologies and classify those under four major typologies according to their construction techniques: 1) adobe, 2) rammed earth, 3) concrete and 4) mixed technique. Secondly, detailed field studies were conducted for representative houses representing the four categories. Finally, 10 houses have been thoroughly audited for using measuring equipment to collect data related to temperature, relative humidity, carbon dioxide concentration, lighting intensity, and envelope thermography. [less ▲]

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See detailComputerized adaptive testing and multistage testing with R
Magis, David ULg; Yan, Duanli; von Davier, Alina

Conference (2016, July 11)

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and ... [more ▼]

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and applications using R open source language and several data examples. The implementations rely on the R packages catR and mstR that have been already or are being developed and include some of the newest research algorithms developed by the authors. This workshop will cover several topics: the basics of R, theoretical overview of CAT and MST, CAT and MST designs, assembly methodologies, catR and mstR packages, simulations and applications. The intended audience for the workshop is undergraduate/graduate students, faculty, researchers, practitioners at testing institutions, and anyone in psychometrics, measurement, education, psychology and other fields who is interested in computerized adaptive and multistage testing, especially in practical implementations of simulation using R. [less ▲]

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See detailGestion des flux patients et surpopulation des urgences : Heurs et malheurs de la fonction de « Bed Manager ».
GILLET, Aline ULg; Minder, Anaïs ULg; Nyssen, Anne-Sophie ULg et al

Conference (2016, July 11)

For many years, emergency departments (ED) overcrowding has become a major issue in Public Health. Many studies have demonstrated the efficiency of flow management coordination on this recurrent problem ... [more ▼]

For many years, emergency departments (ED) overcrowding has become a major issue in Public Health. Many studies have demonstrated the efficiency of flow management coordination on this recurrent problem, by offering an interface between the ED, the hospital and out-of-hospital structures and by coordinating patients’ movements towards hospital care units. This was the basis for the implementation of "bed management" coordination program in the ED of the University Hospital of Liège in January 2014. The present study evaluates the adequacy of the Bed Manager (BM) activity with actual ED and hospital workload. Our results describe the rate of intra-hospital patients’ transfers according to the adequacy of the destination unit and time delays for these transfers. Head nurses from specific care units were interrogated about their perceptions of BM activity. We are now convinced by the importance of a participative approach in the development of ED bed management and working procedures, as well as the usefulness of further studies to explore this complex activity. [less ▲]

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See detailA Novel Methodology for Hybrid Fire Testing
Sauca, Ana ULg; Gernay, Thomas ULg; Robert, Fabienne et al

in Proceedings of the 6th European Conference on Structural Control (2016, July 11)

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is ... [more ▼]

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is calculated separately, here by means of a predetermined matrix. Equilibrium and compatibility at the interface between the tested “physical substructure” and the “numerical substructure” is maintained throughout the test using a dedicated algorithm. The procedures developed so far are sensitive to the stiffness ratio between the physical and the numerical substructure and therefore they can be applied only in some cases. In fire field, the stiffness of the heated physical substructure may change dramatically and the resulting change in stiffness ratio can lead to instability during the test. To overcome this drawback, a methodology independent of the stiffness ratio has been developed, inspired from the Finite Element Tearing and Interconnecting (FETI) method, which has been originally developed for substructuring in numerical analyses. The novel methodology has been successfully applied to a hybrid fire test in a purely numerical environment, i.e. the physical substructure was also modelled numerically. It is shown that stability does not depend on the stiffness ratio and that equilibrium and compatibility can be consistently maintained at the interface during the fire. Finally, the ongoing experimental program aimed at employing and experimentally validating this methodology is described. [less ▲]

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See detailAccounting conservatism, analysts’ performance and stock market liquidity
Boussaid, Nabila ULg; Hamza, Taher; Sougné, Danielle ULg

Conference (2016, July 11)

This paper investigates whether conditional accounting conservatism has informational benefits to financial market participants. Using a large sample of French firms over the period 2001-2014, we report ... [more ▼]

This paper investigates whether conditional accounting conservatism has informational benefits to financial market participants. Using a large sample of French firms over the period 2001-2014, we report that accounting conservatism improves the firm information environment by providing verifiable information. We specifically document that increases in accounting conservatism are associated with more accurate analyst earnings forecasts, less dispersed forecasts and less volatility in forecast revisions. We also provide evidence that increases in firm accounting conservatism lead to subsequent increases in stock market liquidity, tested on the price impact dimension. Overall, our findings are in line with conservatism being useful to financial markets participants such as financial analysts and investors. [less ▲]

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See detailHieroglyphic encoding: The Thot Sign-List (TSL) data model and the hieroglyphic signs in Unicode
Polis, Stéphane ULg; Rosmorduc, Serge

Conference (2016, July 11)

In this paper, we review issues related to the existing hieroglyphic sign-lists, focusing especially on the problematic aspects of the 'Manuel de Codage' (1988) and of the so-called 'Hieroglyphica' (2000 ... [more ▼]

In this paper, we review issues related to the existing hieroglyphic sign-lists, focusing especially on the problematic aspects of the 'Manuel de Codage' (1988) and of the so-called 'Hieroglyphica' (2000) for font-designers and users alike. We propose and discuss a data model for the Thot Sign-List (TSL, in prep.). This data model shall lead to the implementation of a structured and systematically referenced hieroglyphic repertoire, which should ultimately allow a sound extension of the Egyptian Hieroglyphs in Unicode. [less ▲]

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See detailCounting time measurement and statistics in gamma spectrometry: the balance
Guembou Shouop, Cébastien Joel ULg; Ndontchueng Moyo, Maurice; Chene, Grégoire ULg et al

Poster (2016, July 11)

Nuclear counting statistics at high count rate are assessed on a γ-ray spectrometer set-up. Our typical gamma spectrometry system consists of a High Purity Germanium (HPGe) detector, liquid nitrogen ... [more ▼]

Nuclear counting statistics at high count rate are assessed on a γ-ray spectrometer set-up. Our typical gamma spectrometry system consists of a High Purity Germanium (HPGe) detector, liquid nitrogen cooling system, preamplifier, detector bias supply, linear amplifier, analog-to-digital converter (ADC), multichannel storage of the spectrum, and data readout devices. Although the system is powerful enough for background measurements, it is important, nowadays, to have a great statistical in short time measurement: which is a challenge for scientists. The purpose of this study was to determine the average time for gamma spectrometry measurement. To detect Uranium, Thorium and their respective daughters and Potassium series with a relative related error less than 1%, it was found that it is necessary to count during a minimum of 24 Hours (86,400 s). This result is in accordance to the literature with planar geometry detector. These results conduct us to make the following three guidelines for selecting the detector best suited for an application: 1. The more detector material available (germanium semi-conductor), the higher the full-energy peak efficiency. 2. The smaller the distance between the detector and the source material, the higher the full- energy peak efficiency. 3. While better resolution gives a better MDA, the resolution contributes only as the square root to the MDA value, whereas the MDA is proportional to the full-energy peak efficiency. This idea came to us by comparing the spectra of measuring radioactivity lasts for 12 hours in the day that does not fully covered the night spectra for the same sample. The conclusion after several investigations became clearer: to remove all effects of radiation from outside (earth, sun and universe) our system, it is necessary to measure the background for 24, 48 or 72 hours. In the same way, the samples have to be measures for 24, 48 or 72 hours to be safe to be purified the measurement (equality of day and night measurement). It is also possible to not use the background of the winter in summer. Depend to the energy of radionuclide we seek, it is clear that the most important steps of a gamma spectrometry measurement are the preparation of the sample and the calibration of the detector. [less ▲]

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See detailOptimal returnable transport items management
Limbourg, Sabine ULg; Martin, Adeline; Paquay, Célia ULg

Conference (2016, July 11)

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a ... [more ▼]

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a closed-loop supply chain. Face-to-face interviews with senior executives from seven companies involved in RTIs were conducted to gain a thorough understanding of how they manage the flow of RTIs as well as how they determine the number of RTIs needed in a fleet. Results indicate that RTIs managements are quite diverse, that some common beliefs about RTIs do not apply to all RTI types, and that research efforts are needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and scheduling. [less ▲]

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See detailMultiscale study of the Carolingian mosaic of Germigny-des-Prés (Loiret, Fr
Van Wersch, Line ULg; Kronz, L.; Simon, K. et al

Conference (2016, July 08)

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See detailReproducibility of a tennis serve protocol
Tubez, François ULg; FORTHOMME, Bénédicte ULg; Croisier, Jean-Louis ULg et al

Conference (2016, July 08)

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill ... [more ▼]

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill. Players have a maximum of control on this stroke. It is unclear whether 3D kinematic tests are reproducible for the same player under identical conditions and if a familiarization session is necessary. In practice, with professional players, who have little time available to perform tests, familiarization sessions are difficult. The aim of our study is to measure the reproducibility of a 3D serve protocol test. METHODS Nine tennis players (righties, regional level, 20 ± 2 years) were asked to hit first flat serves in a 1 m² area placed on the "T" zone of deuce diagonal of the tennis court. Two identical tests are performed one week apart. For each test, we selected the three best serves of the 25 trials (with the highest speed and the highest accuracy). Kinetics measurements were performed using a 3D analysis system (Codamotion), a force platform (Kistler) and a radar gun. 28 markers were placed on the players’ bodies to measure kinematics of the movements: ankles, knees, hips, trunk, shoulder, elbow and wrist dominant side. We measured ball speed, leg drive, linear velocity of the racket and joints, joints range of motion and maximum angular velocities at different positions (armed, maximum external rotation and impact) (1). RESULTS All analyzed parameters (linear speeds of racket and joints, leg drive force, joint angles and angular velocities) are reproducible with exception of a small part of them. Our study shows that 5,7% (7 of 122 measurements) joint position parameters and 8,3% (4 of 48 measures) angular velocity parameters are not reproducible from a session to another. DISCUSSION Various errors sources encountered in 3D analysis can justify the presence of non-reproducible parameters (2-3). However, after this work, we can state that the established protocol provides reproducible results when analyzing the tennis serve. [less ▲]

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See detailRestricted interests in autism with versus without speech onset delay : the importance of perceptually versus thematically organized interests
Chiodo, Liliane ULg; Majerus, Steve ULg; Eusèbe, Sandrine et al

Poster (2016, July 07)

Objectives : To explore whether autistic adults with vs without speech delay also differ in the perceptual vs thematic nature of their restricted interests.

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See detailNonlinear analysis of compliant mechanisms: application to tape springs
Dewalque, Florence ULg; Bruls, Olivier ULg

Poster (2016, July 07)

Brief summary of the mechanical behaviour of tape springs. Main results obtained by the means of finite element models. Description of the experimental set-up and results. See the extended abstract for ... [more ▼]

Brief summary of the mechanical behaviour of tape springs. Main results obtained by the means of finite element models. Description of the experimental set-up and results. See the extended abstract for more details. [less ▲]

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See detailValorization of CO2 for the preparation of advanced materials
Gennen, Sandro ULg; Grignard, Bruno ULg; Thomassin, Jean-Michel ULg et al

Conference (2016, July 07)

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See detailNovel butanol pretreatment significantly improves delignification and saccharification of different lignocellulosic biomasses
Schmetz, Quentin ULg; Teramura, Hiroshi; Jacquet, Nicolas ULg et al

Poster (2016, July 07)

Organosolv pretreatment using diluted acid and butanol allows the separation of cellulose, hemicelluloses and lignin into three distinct phases. The butanol process has been investigated on six different ... [more ▼]

Organosolv pretreatment using diluted acid and butanol allows the separation of cellulose, hemicelluloses and lignin into three distinct phases. The butanol process has been investigated on six different biomasses: tall fescue, sugarbeet pulp, sugarcane bagasse, beech wood, eucalyptus and Japanese cedar. Dilute acid pretreatment has been performed under similar conditions for comparison. [less ▲]

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See detailSingle Molecule force spectroscopy on helical foldamers
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Conference (2016, July 07)

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See detailDevelopment and optimization of a TD-GC/MS methodology for detection and quantifi cation of furan released in air using of an experimental design.
Alsafra, Zouheir ULg; Scholl, Georges ULg; Romain et al

Poster (2016, July 07)

In the aim of understanding the way in which human is exposed to furan present in the air of an occupational area, an analytical method of Thermal desorption-gas chromatography/Mass spectrometry (TD-GC/MS ... [more ▼]

In the aim of understanding the way in which human is exposed to furan present in the air of an occupational area, an analytical method of Thermal desorption-gas chromatography/Mass spectrometry (TD-GC/MS) has been developed and optimized using a Plackett–Burman experimental design. This method was then used to study the phenomena of diffusion of furan released in air from a contamination source. This source of furan is simply a coffee machine located in a closed controlled room. Results show that furan concentration increases quickly over time after turning on the coffee machine until reaching a maxima. Then it starts to decrease slowly. On the other hand, concentration of furan seems to be identical everywhere in the conditioned room in each moment. [less ▲]

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See detailL’argumentation de l’image scientifique : une affaire de méréologie
Dondero, Maria Giulia ULg

in Pollet, Marie-Christine; Glorieux, Carole (Eds.) Argumenter dans les écrits scientifiques (2016, July 07)

Ce texte vise à étudier, dans une perspective sémiotique, le discours scientifique de recherche et celui de la vulgarisation et notamment les images présentes dans ces deux genres de discours. Nous ... [more ▼]

Ce texte vise à étudier, dans une perspective sémiotique, le discours scientifique de recherche et celui de la vulgarisation et notamment les images présentes dans ces deux genres de discours. Nous examinons des travaux relevant de l’astrophysique et notamment la manière dont les images argumentent. Le corpus sera abordé à partir de la notion de rhétorique entendue comme un ensemble d’opérations méréologiques. Nous reprendrons à ce propos la théorie de l’iconicité de Jean-François Bordron, illustrée par ses deux derniers livres, L’iconicité et ses images (2011) ainsi qu’Image et vérité. Essais sur la dimension iconique de la connaissance (2013). [less ▲]

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See detailAu-delà des success stories, quel processus de libération ? Étude de cas au sein du secteur public belge
Fox, Fanny ULg; Pichault, François ULg

Conference (2016, July 07)

Si l’on peut s’attendre à ce qu’un processus de libération s’inscrive logiquement dans une perspective polyphonique (Pichault, 2013) – marquée par l’importance de la communication et de la mobilisation ... [more ▼]

Si l’on peut s’attendre à ce qu’un processus de libération s’inscrive logiquement dans une perspective polyphonique (Pichault, 2013) – marquée par l’importance de la communication et de la mobilisation des acteurs, mais aussi par les affrontements entre voix opposées (Sullivan & McCarthy, 2008), il peut tout aussi bien être sous-tendu par un volonté de contrôle et de disciplinarisation du corps social relevant davantage du panoptisme. À travers une recherche qualitative, nous explorons la mise en œuvre du processus de libération : ses étapes, les obstacles rencontrés et la façon dont ils ont été – ou non – surmontés, l’implication des différentes parties prenantes et les négociations y afférentes, les résistances et les tensions suscitées, etc. Cet article, de nature empirique, repose sur une étude de cas originale réalisée dans le secteur public belge, marquée par une forte présence syndicale. Il ambitionne d’éclairer certaines contradictions de l’entreprise libérée envisagée sous l’angle de la gestion du changement. [less ▲]

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See detailDiversity and evolution of transposable elements in the Arabidopsis lyrata and A. halleri genomes
Caron, Thibault; Legrand, Sylvain; Schvartzman Echenique, Maria Sol ULg et al

Conference (2016, July 07)

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See detailIntegrated microfluidic device for in line SERS detection for glyphosate and related metabolites
Emonds-Alt, Gauthier ULg; Malherbe, Cédric ULg; Monbaliu, Jean-Christophe ULg et al

Poster (2016, July 07)

The goal of this work is to develop a quantitative analytical method for the glyphosate and its major metabolite the aminomethylphosphonic acid (AMPA) by coupling microfluidics with surface enhanced Raman ... [more ▼]

The goal of this work is to develop a quantitative analytical method for the glyphosate and its major metabolite the aminomethylphosphonic acid (AMPA) by coupling microfluidics with surface enhanced Raman spectroscopy (SERS). This work is divided into 4 axes : (a) bimetallic nanoparticles synthesis in a microreactor, (b) nanoparticles functionnalisation, (c) SERS quantification of glyphosate/AMPA and (d) miniature prototype development composed of axes a to c. The first section aims at the synthesis of bimetallic nanoparticles (Au-Ag, Au-Cu and Ag-Cu) in a microfluidic device. This microfluidic device integrates a first section for the synthesis of monometallic nanoparticles (core) and a second section for the reductive deposition of a second metal (shell). The second axe of this work deals with the functionnalisation of nanoparticles to improve the selectivity of this method for the selected analytes. Two types of functionnalisation are studied : PEGylation (a) with multi-arm PEG ending with -SH and/or (b) with linear heterobifunctionnal PEG. The third axe consists in measuring quantitatively glyphosate and AMPA in different matrices, such as water, urine and fruit juice. Finally, the forth axe deals with the development of a portable detection system to perform on-site analysis. This prototype integrates the microfluidic device for nanoparticles synthesis, their functionnalisation, an injection port followed by a mixing section for the sample and an integrated Raman spectrometer for in-line analysis. [less ▲]

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See detailDu tableau au plan. Remake et transmédialité dans "Shirley" (2013) de Gustav Deutsch
Belloi, Livio ULg

Conference (2016, July 06)

Cette communication prend pour objet "Shirley" (2013), le dernier en date des films de Gustav Deutsch. Dans ce film de fiction, l'artiste autrichien vise à recréer, à incarner et à animer treize tableaux ... [more ▼]

Cette communication prend pour objet "Shirley" (2013), le dernier en date des films de Gustav Deutsch. Dans ce film de fiction, l'artiste autrichien vise à recréer, à incarner et à animer treize tableaux du grand peintre américain Edward Hopper. Partant de ce constat, il s'agit d'étudier au plus près les enjeux théoriques et esthétiques dont ce remake transmédial est porteur. [less ▲]

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See detailCity dwellers without a background
Meulemans, Germain ULg

Conference (2016, July 06)

One implication of the notion of taskscape is to make an argument against the idea of the landscape being a 'background for life'. It entails that in a truly ecological view of the world, there cannot be ... [more ▼]

One implication of the notion of taskscape is to make an argument against the idea of the landscape being a 'background for life'. It entails that in a truly ecological view of the world, there cannot be such a thing as a 'background'. This paper examines how these entailments may concern present discussions about 'nature in town' - a notion that has gained importance in different fields since the 1990s. From offshoots in population ecology or ethology to the development of state led initiatives aiming at managing species and ecosystems in towns, it has added city areas to the list of biodiversity hot spots. Anthropologists are not left out of the subject, and have generally invested the notion as a 'hybrid' in which common categories of nature and culture are blurred and re-defined. The paper argues that in these approaches cities are often taken as a background to life, in terms similar to those Ingold aimed at overpassing in his writings on landscape. Building on the case of the study of city soils, I suggest that an approach in which soils are a multispecies compound taken in pedogenesis may provide a way around the 'nature in town' approach. Prolonging the recent soil science assumption that soil organisms 'altogether are the soil', I argue that humans too join them in pedogenesis. In this, the city stops being a background for lives, and becomes a processual entity in which humans, species and materials in fluxes shape one another. [less ▲]

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See detailInsight on Van Dongen’s La Violoiste by hyperspectral imaging and MA-XRF
Herens, Elodie ULg; Strivay, David ULg; Walter, Philippe et al

Conference (2016, July 06)

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See detailDébattre la mesure : l'imagination sociologique de Steve reich
Orianne, Jean-François ULg

Conference (2016, July 06)

Cette communication vise à identifier les apports de la musique de Steve Reich à la sociologie. Sa musique présente trois caractéristiques majeures : elle se compose à partir d’un matériau empirique ... [more ▼]

Cette communication vise à identifier les apports de la musique de Steve Reich à la sociologie. Sa musique présente trois caractéristiques majeures : elle se compose à partir d’un matériau empirique recueilli sur le terrain ; elle est un acte politique et culturel ; elle est une théorie des processus. La musique de Steve Reich affecte la sociologie sur ces trois points : elle interpelle le sociologue sur son métier et son engagement dans le monde social, l’interroge sur ses pratiques et ses méthodes, elle éclaire même ses propres concepts (en particulier celui de processus). L’auteur propose d’extraire du travail de composition de Steve Reich quelques éléments utiles pour le métier de sociologue : 1) une contribution à la théorie des processus sociaux ; 2) la question du rapport à l’empirie ; 3) le problème de l’engagement (politique, moral et culturel). [less ▲]

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See detailLe stéthoscope au bout du clavier : la médecine générale belge à l'ère de l'e-Santé
Slomian, Cynthia ULg

Conference (2016, July 06)

Cette communication se propose d’explorer l’informatisation de la médecine générale en Belgique. Nous parcourrons la sociologie de la santé dans la littérature, en revenant sur les approches s’intéressant ... [more ▼]

Cette communication se propose d’explorer l’informatisation de la médecine générale en Belgique. Nous parcourrons la sociologie de la santé dans la littérature, en revenant sur les approches s’intéressant aux rôles respectifs du médecin et du malade (Parsons, 1951), à la division du travail médical (Freidson, 1984) et également à la segmentation de la profession médicale (Bucher et Strauss, 1961). Nous intégrerons ensuite un nouvel élément au raisonnement sociologique afin de compléter et dépasser les approches traditionnelles : la digitalisation de la pratique médicale. En effet, il paraît indispensable de comprendre les implications, d’une part, de l’utilisation de plus en plus fréquente des TIC par les médecins et, d’autre part, du partage de données de santé, qui est au cœur de nombre de politiques publiques en Europe et ailleurs à l’heure actuelle. Plus précisément, nous reviendrons sur les changements récents dans le paysage belge des soins de santé, qui intègre l’e-Santé au cœur des politiques publiques depuis 2013. L’étude de documents ainsi que du discours des acteurs institutionnels constituera les fondements de l’analyse exploratoire proposée. Nous espérons ainsi montrer pourquoi la sociologie de la médecine doit intégrer le numérique comme élément essentiel de compréhension pour étudier les relations entre professionnels de la santé, mais également pour considérer le colloque singulier médecin-patient sous un jour nouveau. [less ▲]

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See detailDe ferrovipathe à vaporiste. Ethnographie de la restauration de locomotives à vapeur
Lejeune, Christophe ULg

Conference (2016, July 06)

Voilà un demi-siècle, quand les sociétés nationales de chemin de fer ont délaissé les locomotives à vapeur, des amateurs ont décidé de sauvegarder ce patrimoine ferroviaire. Depuis, leurs associations ... [more ▼]

Voilà un demi-siècle, quand les sociétés nationales de chemin de fer ont délaissé les locomotives à vapeur, des amateurs ont décidé de sauvegarder ce patrimoine ferroviaire. Depuis, leurs associations recrutent chaque jour des volontaires, issus d'horizons variés. Le débutant commence par trier des boulons, poncer un châssis ou appliquer un enduit contre la corrosion. Un tuteur lui apprend ensuite comment allumer et alimenter un foyer à charbon. En dépit de ce compagnonnage, le quotidien des volontaires ne correspond pas totalement à celui des artisans (Sennett, 2010). S'ils s'identifient volontiers aux cheminots, ils critiquent les sociétés nationales qui délaissent leur patrimoine. Comme le métro (Thibault, 2013) ou les automobiles (Dant, 2010), les locomotives se restaurent en coulisse. Leurs réparateurs ne bénéficient donc pas de la reconnaissance du public. Ils n'entendent pas moins opérer avec «professionnalisme» : ils maintiennent en activité d'antiques machines tout en respectant les (exigeantes) règles de sécurité actuelles. Et ils y arrivent sans disposer de pièces de rechange. Ainsi, malgré son ressort nostalgique, la préservation ferroviaire préfigure les collectifs actuels de réparateurs («repair café»). Loisir, sacerdoce, travail-à-côté, artisanat, tremplin pour l'emploi ? La configuration protéiforme de la restauration de locomotives à vapeur interroge la pertinence des catégories sociologiques susceptibles d'en rendre compte. [less ▲]

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See detailEtude de la composition chimique de Pseudotsuga menziesii (Mirb.) Franco et évaluation de l’impact de divers prétraitements lignocellulosiques sur l’extraction de la lignine
Berchem, Thomas ULg; Schmetz, Quentin ULg; Jacquet, Nicolas ULg et al

Poster (2016, July 06)

La raréfaction des ressources fossiles est une certitude à l’heure actuelle. Il est donc primordial de trouver des voies de production plus durables pour des produits de consommation courante. Le ... [more ▼]

La raréfaction des ressources fossiles est une certitude à l’heure actuelle. Il est donc primordial de trouver des voies de production plus durables pour des produits de consommation courante. Le bioraffinage fait partie des solutions envisagées pour substituer les matériaux originaires de la filière pétrochimique. Dans cette optique, ce travail se focalise sur l’extraction et la caractérisation de la lignine à partir d’une biomasse présente en abondance en région Wallonne, Pseudotsuga menziesii (Mirb.) Franco (Douglas). Ce travail vise à montrer l’impact de divers prétraitements lignocellulosiques, tant en terme de rendements et de pureté d’extraction qu’au niveau de la modification de la structure et des propriétés des lignines. Ces différents paramètres sont évalués par des techniques gravimétriques (Klason), chromatographiques (chromatographie d’exclusion stérique) et spectroscopiques (RMN 2D HSQC). Pseudotsuga menziesii (Mirb.) Franco a été préalablement caractérisé par son taux de matière lignocellulosique (cellulose, hémicelluloses, lignine), ainsi que sa teneurs en cendres, en protéines et en extractibles (à l’eau et à l’éthanol). Les lignines natives ont été caractérisées par RMN 2D HSQC. [less ▲]

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See detailLa production en masse de microalgues: limitations actuelles, perspectives d'amélioration et applications dans le domanaine des pigments valorisables
Franck, Fabrice ULg

Conference (2016, July 06)

Actuellement les productions industrielles de microalgues sont exploitées pour diverses applications commerciales. Les cultures sont le plus souvent réalisées sur le mode photoautotrophe, c’est-à-dire ... [more ▼]

Actuellement les productions industrielles de microalgues sont exploitées pour diverses applications commerciales. Les cultures sont le plus souvent réalisées sur le mode photoautotrophe, c’est-à-dire basées sur l’absorption de lumière pour l’incorporation du carbone du CO2 dans la biomasse. Bien que les productivités atteignent des valeurs respectables par rapport aux rendements agricoles, elles restent limitées par de faibles rendements de conversion de l’énergie solaire, en comparaison avec le rendement théorique maximum. Les raisons généralement évoquées pour expliquer cette limitation sont principalement l’atténuation de la lumière dans les cultures et la saturation de la photosynthèse en surface. Les pistes d’amélioration proposées concernent d’une part la géométrie des systèmes de culture et, d’autre part, l’amélioration génétique des souches de microalgues en vue d’une meilleure efficience énergétique. Des cultures hétérotrophes en fermenteur sont également en développement. Avec les limitations actuelles de productivité, les coûts de production restent élevés pour des applications à faible valeur ajoutée. Les pigments des microalgues, par leur variété et leurs multiples débouchés, représentent une catégorie en expansion de produits économiquement viables. Ils comprennent principalement les caroténoïdes de microalgues vertes et de diatomées, ainsi que les phycobilines des cyanobactéries. [less ▲]

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See detailOptimisation de la production d’acide furan-2,5-dicarboxylique à partir de déchets verts pour la conception de plastiques bio-basés
Istasse, Thibaut ULg; Jacquet, Nicolas ULg; Richel, Aurore ULg

Poster (2016, July 06)

Afin de trouver des alternatives renouvelables aux produits issus de l’industrie pétrochimique, de nombreuses voies de recherches ont été explorées. Une voie prometteuse est la technologie des dérivés ... [more ▼]

Afin de trouver des alternatives renouvelables aux produits issus de l’industrie pétrochimique, de nombreuses voies de recherches ont été explorées. Une voie prometteuse est la technologie des dérivés furaniques. Parmi ces composés, le 5-hydroxyméthylfurfural (5-HMF) fait partie des molécules plateformes les plus importantes1. Il s’agit d’un produit de dégradation obtenu par déshydratation des hexoses2,3. Le 5-HMF peut servir de base à la conception de nombreuses molécules valorisables comme l’acide furan-2,5-dicarboxylique dont la structure proche de l’acide téréphtalique permet des applications dans la conception de polymères bio-basés3. L’acide furan-2,5-dicarboxylique respecte la législation REACH selon l’European Chemicals Agency4. Un rapport de l’EFSA de 2014 a démontré que cette substance ne posait pas de problème de toxicité lors de son utilisation comme monomère de base dans les plastiques d’emballage pour aliments5. Selon la société Avantium, le FDCA peut être utilisé pour produire un plastique entièrement bio-basé, le polyéthylène furanoate (PEF), qui affiche des performances supérieures à celle du poléthylène téréphtalate (PET) en termes de stabilité thermique, de propriétés mécaniques et de perméabilité aux gaz6. Si le FDCA peut être convertit en de nombreux produits à haute valeur ajoutée, il existe toutefois un frein majeur à son exploitation industrielle : son précurseur, le 5-HMF, n’est pas encore produit en grande quantité1. Ce problème est dû principalement à la déshydratation non sélective des sucres de la biomasse qui aboutit à de nombreux autres produits que le 5-HMF. La première difficulté à surmonter est donc la mise au point d’un procédé permettant de déshydrater de manière efficace et sélective les sucres de la biomasse. Le 5-HMF est également peu stable en milieu acide où il se décompose en acide formique et en acide lévulinique2. L'enjeu du projet de recherche présenté est donc l’optimisation de la production de 5-HMF à partir d’un ou plusieurs types de biomasses dans un premier temps, puis l’optimisation de la conversion du 5-HMF produit en FDCA. Les paramètres à prendre en compte sont notamment les sources de biomasse, l’efficacité des prétraitements concernant l’extraction des sucres, la sélectivité et l’efficacité de la conversion de ces sucres en 5-HMF (système mono- ou biphasique), l’étude de divers catalyseurs, le coût des traitements, etc… [less ▲]

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See detailNeighborhood search approaches for multi-trip vehicle routing problems
François, Véronique ULg; Arda, Yasemin ULg; Crama, Yves ULg

Conference (2016, July 06)

We introduce two large neighborhood search approaches for solving the multi-trip vehicle routing problem (MTVRP), where each vehicle can perform several routes to serve a set of customers. The problem ... [more ▼]

We introduce two large neighborhood search approaches for solving the multi-trip vehicle routing problem (MTVRP), where each vehicle can perform several routes to serve a set of customers. The problem specifically arises when travel times between customers are short and/or when demands are large. It has been commonly solved in the literature by mixing vehicle routing heuristics and bin packing techniques aimed at assigning routes to vehicles. As an alternative, we propose specific operators that tackle the routing and the assignment aspects of the problem simultaneously. The introduced methods are compared both for the MTVRP and the version with time windows, in which the assignment part of the problem becomes more challenging. In the latter, besides considering a time window at the depot, the working time of each vehicle may not exceed a maximum duration, while its start time is a decision variable. Beyond providing several best known solutions for benchmark instances of the MTVRP, we focus on understanding the behavior of the algorithms. An automatic configuration tool is used, not only to improve the quality of the results, but also as a mean to gain knowledge about algorithm design options and their interactions. We question the impact of several heuristic components and in particular those of the roulette wheel mechanism and of the adaptive memory of routes. [less ▲]

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See detailGamifier un quiz – Effet graduel sur la performance, l’immersion et la perception de compétence
le Maire, Nathalie ULg; Fauconnier, Marie-Laure ULg; Colaux, Catherine ULg et al

Conference (2016, July 06)

Dans un contexte marqué par l’arrivée d’une génération pour laquelle les technologies, les réseaux sociaux et les jeux en ligne relèvent de l’évidence (Stein, 2013; Weiler, 2004), le jeu a souvent été ... [more ▼]

Dans un contexte marqué par l’arrivée d’une génération pour laquelle les technologies, les réseaux sociaux et les jeux en ligne relèvent de l’évidence (Stein, 2013; Weiler, 2004), le jeu a souvent été qualifié de véhicule d’une pédagogie rendant l’étudiant acteur de son apprentissage, conférant une dimension de défi aux activités éducatives et générant une motivation intrinsèque (Foster, 2008; Kang & Tan, 2008; McFarlane et al., 2002; Mitchell & Savill-Smith, 2004; Papastergiou, 2009). Ce potentiel éducatif du jeu a cependant été souvent associé à des jeux immersifs (de Freitas, 2006) requérant la mise en œuvre d’une trame narrative et dont le développement peut s’avérer couteux. L’utilisation de mini-jeux est considérée comme une solution alternative à ces « serious games » complexes car ils permettent d’enseigner un grand nombre de concepts tout en générant de faibles coûts de développement (Illanas, Gallego, Satorre, & Llorens, 2008). Ceux-ci présentent des règles basiques, sont faciles à jouer et conçus comme objets d’apprentissage de sorte qu’il soit aisé pour l’étudiant de percevoir les informations essentielles et que leur pratique soit bénéfique pour l’apprentissage (Frazer, Argles, & Wills, 2007). La gamification, à savoir la transposition des principes issus de l’univers du jeu au domaine de l’éducation (Deterding, Dixon, Khaled, & Nacke, 2011), ne porte donc pas ici sur des jeux de simulation immersifs mais vise plus réalistement la transposition à des activités d’apprentissage d’un certain nombre de principes et de leviers à l’œuvre dans des mini-jeux populaires tel que Candy Crush. La question de recherche qui a guidé l’expérience décrite ci-après concerne l’évaluation du potentiel pédagogique de l’utilisation d’un mini-jeu de ce type dans un cours de chimie générale en complément des supports pédagogiques plus classiquement utilisés en première année d’université. Concrètement, ce mini-jeu appelé « Atomica » se présente comme un quiz d’entrainement portant sur un chapitre réputé difficile du cours, l’atomistique. Ce quiz a fait l’objet de quatre versions activant chacune un nombre croissant d’éléments de gamification (indiqués en gras) décrits par plusieurs auteurs comme étant les « ingrédients » ou « building blocks » d’un bon jeu (Bunchball Inc., 2010; Dignan, 2011; Reeves & Read, 2013) : - La version contrôle du QCM se présente comme similaire aux évaluations formatives couramment utilisées à l’université ; - La version 1 segmente le QCM en six niveaux de difficulté ; - La version 2 ajoute un feedback automatisé aux niveaux de difficulté ; - La version 3 présente une version maximaliste de la gamification puisque, aux éléments précédents, elle ajoute un compte à rebours, des indices dont l’appel engendre une perte de points, un classement des meilleurs joueurs et un indicateur social (possibilité de se situer par rapport à la communauté de joueurs). Ce choix d’un dispositif graduel se justifie notamment par l’intérêt pour la détection d’un seuil à partir duquel l’ajout d’éléments de gamification fait basculer la perception d’un quiz habituel vers un artefact relevant du mini-jeu et générant ainsi un état de flow chez le joueur. Chaque version a été soumise à un groupe d’une trentaine d’étudiants, selon une procédure expérimentale contrôlée, avec pour objectif la collecte de données (en cours) sur : - L’état de flow ou expérience optimale engendré par chacune des versions (orientation comparative) défini comme un état subjectif de bien-être (Csikszentmihalyi, 1990) engendrant une immersion totale dans l’activité. Afin de mesurer le flow, une échelle spécifique aux jeux éducatifs (EGameFlow) développée en 2009 (Fu, Su, & Yu, 2009) a été utilisée dans le cadre de cette étude. - Une des trois composantes du modèle de la dynamique motivationnelle de Viau, la perception du sentiment de compétence (Bandura, 1993; Pajares, 2014) considéré comme un moteur essentiel à l’apprentissage et un déterminant de l’intérêt pour une discipline scolaire. - La performance à un test de connaissance soumis aux étudiants avant et après l’expérience de jeu. Les motivations sous-tendant le processus d’exploration des mini-jeux sont à chercher du côté d’un certain discours pédagogique qui prône l’inscription d’une dimension ludique dans les apprentissages en enseignement supérieur. Nourrie par ses résultats expérimentaux, la communication proposera un retour réflexif plus général sur la valeur, les limitations et les conditions de réalisation de ce discours. [less ▲]

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See detailHigh-temperature and quantitative XRD study of typical Westerwald clays (Germany)
Fontaine, François ULg; Fagel, Nathalie ULg

Poster (2016, July 05)

The Westerwald is one of the largest and oldest clay mining area of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian ... [more ▼]

The Westerwald is one of the largest and oldest clay mining area of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian rocks. During the Miocene, intense volcanic activities led to a large basalt cover, protecting the clays from the erosion. The fine fraction is mainly composed of kaolinite and illite, with the possible presence of interstratified I S. Other minerals such as quartz, feldspars, hematite, goethite or anatase are present in variable concentrations. Four typical Westerwald clays were chosen for this study: kaolinite-rich clay, kaolinite-illite clay, a red and a yellow firing clays. The first goal is to perform quantitative XRD using two different methods and to compare them: reference intensity ratio (RIR) and Rietveld (using Topas and BGMN). The second goal is the study of those samples using high-temperature XRD (HTXRD). The samples were heated up to 1250°C and a XRD pattern was obtained in situ every 100°C. The results show the temperatures of vitrification and formation of mullite and cristobalite varying from one sample to another, which is mainly linked to their flux concentration. [less ▲]

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See detailPIXE-PIGE analysis of Early Medieval Glass Artefacts at IPNAS cyclotron external beam line
Chene, Grégoire ULg; Van Wersch, Line ULg; Biron, Isabelle et al

Poster (2016, July 05)

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See detailBeyond national accounting figures: how quantification practices reshape the state
Piron, Damien ULg

Conference (2016, July 05)

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See detailProgramme de soutien aux aidants de patients présentant la maladie d’Alzheimer : une étude de cas
Clesse, Audrey ULg; Missotten, Pierre ULg; Adam, Stéphane ULg

Poster (2016, July 05)

Il est largement reconnu que vivre au jour le jour avec un proche atteint de la maladie d’Alzheimer est une situation particulièrement éprouvante. La charge générée par cette maladie peut menée à des ... [more ▼]

Il est largement reconnu que vivre au jour le jour avec un proche atteint de la maladie d’Alzheimer est une situation particulièrement éprouvante. La charge générée par cette maladie peut menée à des états de fatigue psychologiques et physiques, voir au burnout, pour l’aidant. Plusieurs études sur la santé des aidants prenant en charge un proche dément ont montré qu’ils constituent, en comparaison aux personnes s’occupant d’un individu âgé non dément, une population à risque, notamment en termes de symptômes dépressifs, détresse psychologique ou de problèmes de santé. Ces constats alarmants justifient la mise en place de programmes de soutien visant à offrir un suivi thérapeutique aux personnes ayant un conjoint ou un parent présentant une démence de type Alzheimer. Nous présentons l’étude de cas de Mme C.G., fille d’une patiente âgée de 79 ans, ayant suivi le programme de soutien développé par Adam et al. (2009), basé sur l’approche de gestion du stress qui suggère l’utilisation de stratégies d’ajustement centrées sur la résolution de problèmes. Avant et après l’intervention, Mme C.G. a répondu à différents questionnaires examinant sa santé psychologique (MBI, BDI-II, STAI, etc.), sa manière de gérer la maladie de son parent (WCC, CAMI, SCQ, etc.) et l’état général de la patiente (ADRQL, IADL, NPI). La comparaison pré et post-intervention apporte des éléments positifs, notamment concernant l’amélioration de la qualité de vie de l’aidante, de son sentiment de compétence et d’efficacité à gérer la maladie au quotidien. Concernant le burnout, qui était la priorité de cette intervention, nous constatons que l’épuisement émotionnel de l’aidante tend à diminuer au cours des séances de counseling. Un autre constat particulièrement important concerne les changements familiaux opérés tout au long de la thérapie ; ce qui pose question quant à la réorganisation de la dynamique familiale. Ces résultats positifs démontrent l’importance de développer des programmes d’aide aux aidants grâce à une approche clinique globale et holistique de la situation, étant donné les composantes neuropsychologiques, cognitives et systémiques impliquées. [less ▲]

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See detailThe economic effectiveness of economic land supply
Halleux, Jean-Marie ULg; Vandermeer, Marie-Caroline

Conference (2016, July 05)

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See detailQuelles conditions favorisent le changement de pratiques lors de la mise en oeuvre d'un dispositif didactique?
Dellisse; De Croix, Séverine ULg; Dumay, Xavier et al

Conference (2016, July 05)

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See detailIdentifying wheat varieties with low acrylamide potential
Lecart, Brieuc ULg; Jacquet, Nicolas ULg; Anseeuw, Laurent et al

Poster (2016, July 05)

Maillard reactions are responsible for the formation of many compounds in food that have been baked at temperatures above 120°C1. Some of these compounds are sought for their contribution to the ... [more ▼]

Maillard reactions are responsible for the formation of many compounds in food that have been baked at temperatures above 120°C1. Some of these compounds are sought for their contribution to the organoleptic qualities of food but others, such as acrylamide, have been identified since 1986 as reprotoxic, genotoxic and carcinogenic in animals2. Synthesized from a chain reaction between free sugars and free asparagine, acrylamide has been found in many food such as products prepared from wheat flour1,3,4. The correlation between the amount of free sugars and free asparagine in raw food with the acrylamide content in the baked food has been well documented5. For this reason we compared the levels of 15 wheat varieties and identified wheat varieties with significantly lower level (=0.05) in acrylamide precursors. Those varieties could therefore be used preferentially in products intended for food. [less ▲]

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See detailColumn Generation Based Algorithms for a VRP with Time Windows and Variable Departure Times
Michelini, Stefano ULg; Arda, Yasemin ULg; Küçükaydin, Hande

Conference (2016, July 05)

We investigate a solution methodology for a variant of the VRP with time windows. In the examined variant, the departure time of each vehicle from the depot can be determined by the decision-maker, who ... [more ▼]

We investigate a solution methodology for a variant of the VRP with time windows. In the examined variant, the departure time of each vehicle from the depot can be determined by the decision-maker, who aims at minimizing the overall duration of the routes, including waiting times, while respecting the maximum allowed working duration of each vehicle. In order to solve this problem with a branch-and-price methodology, we address the associated pricing problem as an elementary shortest path problem with resource constraints (ESPPRC). We propose an adapted bidirectional dynamic programming algorithm for the studied ESPPRC. The decremental state space relaxation (DSSR) technique is also implemented as an acceleration technique both to obtain ng-routes and elementary routes. Several implementation and integration strategies are considered for the DSSR and ng-route relaxation techniques. The ng-route pricing and the elementary route pricing algorithms are compared inside a column generation procedure. For both column generation procedures, the algorithmic choices are made and the values of the numerical parameters are determined using an automatic algorithm configuration tool, the irace package. Finally, we discuss how these column generation procedures can be included as a component in the development of a matheuristic. [less ▲]

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See detailStocks de Carbone Organique et des incertitudes
Chartin, Caroline; Krüger, Inken ULg; Carnol, Monique ULg et al

Conference (2016, July 05)

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See detail"Lirécrire pour apprendre": enjeux et méthodologie d'une recherche expérimentale en milieu naturel
Wyns, Marielle; De Croix, Séverine ULg; Dellisse, Sébastien et al

Conference (2016, July 05)

Les spécificités et les difficultés de la « lecture pour apprendre » au début du secondaire sont à l’origine du projet de recherche longitudinale de type expérimental « Lirécrire pour apprendre ». Ses ... [more ▼]

Les spécificités et les difficultés de la « lecture pour apprendre » au début du secondaire sont à l’origine du projet de recherche longitudinale de type expérimental « Lirécrire pour apprendre ». Ses principaux objectifs sont : d’expérimenter un programme didactique centré sur le développement de la compréhension et de la production des textes à visée informative, de tester la valeur de cet outil sur un large échantillon d’élèves de première année de l’enseignement secondaire, et d’évaluer les conditions d’implémentation et de mise en œuvre de l’outil les plus favorables au changement de pratiques pédagogiques et au maintien de l’innovation. Pendant deux ans (2014-2016), un instrument didactique est expérimenté dans 85 classes de français de première secondaire, issues de 19 établissements belges contrastés (en termes d’indice socio-économique). Cet outil, centré sur l’enseignement explicite des stratégies de compréhension en lecture, a été élaboré dans le souci de prendre en compte les difficultés langagières que rencontrent de nombreux élèves face aux usages scolaires des écrits informatifs (Nonnon, 2007 ; Cèbe & Goigoux, 2007). Il est mis en œuvre par 19 enseignants, répartis dans trois conditions : un groupe « contrôle » et deux conditions expérimentales – les enseignants bénéficient, dans la première de ces conditions, d’une formation à l’utilisation de l’outil ; dans la seconde, de cette même formation et d’un accompagnement en équipe. Dans le cadre de cette communication introductive, nous présenterons les constats à l’origine de la recherche, ainsi que les hypothèses de départ. Nous mettrons ensuite en lumière les enjeux d’une telle recherche, dans les domaines de l’accompagnement des difficultés de lecture au début du secondaire (Baye, Lafontaine, Vanhulle, 2003), et du changement de pratiques des enseignants (Rowan & Miller, 2007). Nous présenterons enfin le design de la recherche, décrirons et questionnerons la méthodologie utilisée pour la collecte de données et les analyses engagées et envisagées. D’autres résultats de recherche – relatifs, d’une part, aux effets de l’instrument didactique sur les performances des élèves en lecture et, d’autre part, aux conditions d’appropriation de l’outil par les enseignants – seront détaillés dans deux communications également présentées dans ce symposium. [less ▲]

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See detailL'efficacité des pratiques d'enseignement de la compréhension en lecture : diversité des voies de la recherche actuelle
Bishop, Marie-France; Crinon, Jacques; De Croix, Séverine ULg et al

Conference (2016, July 05)

De nombreux élèves s’approprient avec difficulté les pratiques langagières de l’école, ce qui handicape lourdement tous leurs apprentissages et la suite de leur scolarité. Plus particulièrement, un ... [more ▼]

De nombreux élèves s’approprient avec difficulté les pratiques langagières de l’école, ce qui handicape lourdement tous leurs apprentissages et la suite de leur scolarité. Plus particulièrement, un déficit dans le domaine de la compréhension peut se manifester au début de l’enseignement primaire, moment des premiers apprentissages en lecture et écriture. Il est également susceptible d’apparaitre lors de l’entrée dans le secondaire, moment où l’écrit est utilisé pour s’approprier des connaissances et où sont par conséquent sollicités, dans les différentes disciplines scolaires, de nouveaux modes de lecture, peu enseignés de façon explicite. Est-il possible d’agir face aux difficultés persistantes des élèves, et d’accroitre la capacité du système éducatif à développer les acquis scolaires, en particulier ceux des élèves issus des milieux les plus précaires ? Quelles pratiques enseignantes s’avèrent les plus efficaces dans le domaine de la compréhension, et comment amener les maitres à les adopter ? Pour apporter une réponse rigoureuse, il semble pertinent de développer des recherches à large échelle et de décrire l’interaction entre les pratiques enseignantes et les performances des élèves, par le biais de prises de mesures fiables. Le symposium comportera cinq communications, issues de deux équipes de pays différents, qui toutes deux ont mené de vastes recherches empiriques sur l’efficacité des pratiques d’enseignement de la lecture-écriture, l’une à l’école élémentaire ("Lire et écrire au CP", en France) et l’autre au premier degré de l’enseignement secondaire ("Lirécrire pour apprendre", en Belgique). Les voies de recherche empruntées relèvent d’approches méthodologiques différentes : d’une part, une approche écologique, centrée sur l’analyse et l’évaluation des pratiques ordinaires de classe ; d’autre part, une approche de type expérimental, avec introduction d’un programme didactique structuré. Le symposium sera l’occasion de questionner l’intérêt, la pertinence, les limites, les difficultés de ces options méthodologiques, et de mettre en évidence leur complémentarité. En outre, chaque intervention traitera, d’une manière ou d’une autre, de la question transversale des enjeux sociaux de nos recherches. En particulier, l’on cherchera à interroger les caractéristiques des pratiques enseignantes qui se révèlent les moins différenciatrices socialement, et à vérifier la capacité de certaines de ces pratiques à faire progresser tous les élèves. Chacune des deux recherches fera l’objet d’une communication introductive qui explicitera le questionnement à l’origine de la recherche, les hypothèses, les objectifs et la méthodologie, et reprendra quelques résultats majeurs. Par ailleurs, trois communications exploreront, sur la base de données ciblées, des questions spécifiques, en lien avec l’efficacité des pratiques d’enseignement de la compréhension en lecture : - Quels sont, d’une part, les mécanismes par lesquels l’école contribue à aggraver les inégalités scolaires dans le domaine de la lecture-compréhension et, d’autre part, les pratiques susceptibles de faire progresser les élèves qui n’ont que l’école pour apprendre ? - Comment la mise en œuvre d’un outil didactique conçu à partir des besoins des plus faibles lecteurs amène-t-elle les enseignants à ajuster leurs pratiques de classe, et quels rôles les dispositifs de formation et/ou d’accompagnement peuvent-ils jouer dans l’appropriation d’un tel outil ? [less ▲]

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See detailL’intégration d’indicateurs biologiques dans un réseau de surveillance des sols afin d’améliorer le diagnostic de la qualité du sol – une étude de cas dans le sud de la Belgique (Wallonie)
Krüger, Inken ULg; Chartin, Caroline; van Wesemael, Bas et al

Poster (2016, July 05)

Les organismes du sol et leurs activités sont essentiels pour le fonctionnement de l’écosystème du sol et ils peuvent donc servir comme indicateurs de la qualité du sol. Des efforts ont récemment été ... [more ▼]

Les organismes du sol et leurs activités sont essentiels pour le fonctionnement de l’écosystème du sol et ils peuvent donc servir comme indicateurs de la qualité du sol. Des efforts ont récemment été menés pour intégrer les indicateurs biologiques de la qualité du sol dans les réseaux de surveillance régionaux/nationaux. Le but de cette étude était de déterminer des gammes de valeurs pour six indicateurs biologiques et deux quotients éco-physiologiques pour les sols agricoles. La respiration potentielle, la biomasse microbienne (carbone et azote), la minéralisation nette de l’azote, la diversité métabolique des bactéries du sol, l’abondance des vers de terre, le quotient microbien et le quotient métabolique ont été mesurés dans 60 sites dans des régions agricoles contrastées (différents types de sol et climat) et différentes utilisations de sol (prairies et cultures) sélectionnés d’un réseau de surveillance du carbone organique du sol (CARBOSOL). Les liens entre indicateurs biologiques et paramètres chimiques (le pH du sol, carbone organique total, soluble, labile et stable) sont analysés. Quatre des six indicateurs biologiques sélectionnés (respiration potentielle, biomasse microbienne (carbone et azote) et diversité métabolique des bactéries du sol) sont significativement plus élevés sous prairies que sous cultures. Les gammes de valeurs sont plus larges sous prairies que sous cultures. Les indicateurs biologiques sélectionnés ne sont pas significativement influencés par la région agricole. Les meilleures corrélations avec les paramètres chimiques ont été trouvées pour la respiration potentielle et la biomasse microbienne (carbone et azote). L’étude définit des gammes de valeurs pour les sols agricoles à l’échelle régionale (Wallonie) séparées par utilisation de sol (prairies et cultures) et présente une base solide pour l’établissement d’un réseau de surveillance de la qualité biologique du sol. [less ▲]

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See detailInterkultureller Transfer und Transformation von Literatur am Beispiel von Herta Müllers "Atemschaukel" und seiner französischen Übersetzung "La bascule du souffle" von Claire de Oliveira
Houscheid, Karin ULg

Conference (2016, July 04)

Wird ein literarisches Werk in eine andere Sprache übersetzt, kommt es nicht nur zu einem sprachlichen, sondern auch zu einem kulturellen Transfer von Literatur. Bei diesem Transfer erfährt das Werk ... [more ▼]

Wird ein literarisches Werk in eine andere Sprache übersetzt, kommt es nicht nur zu einem sprachlichen, sondern auch zu einem kulturellen Transfer von Literatur. Bei diesem Transfer erfährt das Werk unterschiedliche Transformationen, die unter anderem der Adaptation an den jeweiligen Sprach- und Kulturraum dienen. Welche Transformationen ein literarisches Werk beim Übergang in einen anderen Sprach- und Kulturraum erfährt, mit welchen Vermarktungs- und Gestaltungsstrategien es dem neuen Zielpublikum angepasst wird und wie dieses „neue“ Werk im Anschluss von seinen Lesern rezipiert wird, soll am Beispiel von Herta Müllers Atemschaukel und seiner französischen Übersetzung La bascule du souffle von Claire de Oliveira dargelegt werden. Dazu wird auf die unterschiedliche Gestaltung der Cover, die Übersetzung des Titels, den werbenden Klappentext und die damit verbundenen Strategien der Verlage eingegangen. Die Analyse der Rezeptionszeugnisse erlaubt es anschließend zu überprüfen, inwiefern die interkulturellen Transferstrategien die Lektüre und das Urteil der Leser beeinflussen. [less ▲]

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See detailHow elites talk about their political career: Metaphors in spontaneous and informal political discourse
Heyvaert, Pauline ULg

Conference (2016, July 02)

It has often been acknowledged that political discourse is a genre that naturally allows for metaphor use. Moreover, recent research has demonstrated the importance of analysing the political impact of ... [more ▼]

It has often been acknowledged that political discourse is a genre that naturally allows for metaphor use. Moreover, recent research has demonstrated the importance of analysing the political impact of these metaphors: “Examining metaphors that appear in political discourse provides insights into the way speakers understand their situation, and how they seek to accomplish their ends” (Ritchie, 2013). Previous research (Perrez&Reuchamps, 2014) has demonstrated the usefulness of applying Steen’s three-dimensional model of metaphor analysis in communication to a corpus of political discourse. I therefore propose to apply this model to a particular type of elite discourse. The corpus used for this research consists of biographical interviews conducted with Walloon politicians, each describing at length their personal political career within the political dynamics of their country. This corpus offers an interesting ground of investigation because of its spontaneous and informal character. Moreover, most studies on the use of metaphors in political discourse tend to focus on elite discourse with the underlying assumption that elites might knowingly use metaphors to convince the audience. What is interesting with our corpus, is that the interviews do not have a clear addressee or audience. Analysing the form, and particularly the metaphor use of these interviews comes with a number of questions: (i) do politicians use metaphors in spontaneous discourse; (ii) if so, when and (iii) why do they use these metaphors, i.e. do they use them with a specific purpose, as for example explaining a complex political issue, or not? To assess the extent to which politicians use metaphors in spontaneous discourse, we conducted a corpus analysis by applying the MIPVU procedure (Steen et al., 2010) in order to identify potential metaphorical contexts. In line with Steen’s three-dimensional model, we subsequently analysed the identified metaphors by making a distinction between three different layers of metaphor, respectively at the linguistic, conceptual and communicative level. [less ▲]

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See detailEntre cueillette et maraudage :données et informations, matières premières du renseignement
Leroy, Patrick ULg

Conference (2016, July 01)

http://www.ps.be/Pagetype1/Actus/Activites/Rencontres-d’ete-2016-du-PS-(du-1er-au-2-juillet).aspx

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See detailIdentité Alcoolique Anonyme, entre adaptation et liberté.
Della Libera, Clara ULg; Englebert, Jérôme ULg

Conference (2016, July 01)

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See detailHeritage Conservation in River Corridor Cities. The Case of Tripoli, Lebanon.
Ginzarly, Manal ULg; Teller, Jacques ULg

Conference (2016, July)

This article recognizes rivers as cultural heritage landscapes, as an integral component of cities common heritage and an element of collective memory and identity. It is based on the consideration that ... [more ▼]

This article recognizes rivers as cultural heritage landscapes, as an integral component of cities common heritage and an element of collective memory and identity. It is based on the consideration that analysis of the socio-spatial relationship between the river and urban structure at different historical period can further lead to knowledge about the river contribution in forming the identity and sense of place of an urban area. This knowledge can be used to inform urban conservation as well as development practices to support the integral spatial and cultural relation between the city and the river in order to maintain the character of river city. This article takes the historic core in the city of Tripoli, Lebanon as a case study where conservation practices have followed a monument centric approach focusing on the restoration of heritage buildings and sites and neglecting the cultural value of the Abu Ali River flowing through the city. It conducts a multi- dimensional morphological analysis that is based on archival review and field work to extract the social value of the river and its contribution to the urban morphology of the city. [less ▲]

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See detailApplication of NIR hyperspectral imaging combined to chemometrics to assess the impact of tillage on the root system development of a winter wheat crop
Fraipont, Guillaume ULg; Eylenbosch, Damien ULg; Baeten, Vincent et al

Poster (2016, July)

This poster presents de results of a study of the influence of tillage on the root development of a winter wheat crop. The originality of this research lies in the application of an innovative root ... [more ▼]

This poster presents de results of a study of the influence of tillage on the root development of a winter wheat crop. The originality of this research lies in the application of an innovative root quantification method based on the near infrared hyperspectral imaging. [less ▲]

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