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See detailRelevance of early stretching in overhead athletes
Schwartz, Cédric ULg; Tubez, François ULg; Croisier, Jean-Louis ULg et al

Conference (2017, June 16)

Overhead athletes often develop, over time, a tightness of the posterior structures of the shoulder, which may be associated with injuries. Ten symptomatic (with pain) and ten asymptomatic players with a ... [more ▼]

Overhead athletes often develop, over time, a tightness of the posterior structures of the shoulder, which may be associated with injuries. Ten symptomatic (with pain) and ten asymptomatic players with a tight shoulder were compared and the effect of a self-applied stretching program was evaluated. Before and after the stretching program, pain and stiffness of the shoulder were evaluated. Our results demonstrate that risk factors for shoulder pain such as glenohumeral internal rotation deficit and total range of motion deficit may only be limited in symptomatic athletes. The mobility of the shoulder was significantly improved after the stretching program for both groups. Pain was reduced when present. Because of the limited differences between the symptomatic and asymptomatic athletes, clinicians may find it advantageous to initiate early prevention or rehabilitation programs. [less ▲]

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See detailFirst Characterization of the Volatile Organic Compounds Emitted by Banana Plants (Musa sp.)
Berhal, Chadi ULg; De Clerck, Caroline ULg; LEVICEK, Carolina et al

Conference (2017, June 16)

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish ... [more ▼]

Banana fruit (Musa sp.) ranks fourth in developing world's production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety, and Plantain represents that status for the cooking banana group. Despite the importance of the Volatile Organic Compounds (VOCs), which are secondary metabolites with a high vapour pressure, in their utility in the plant protection and communication processes, they were never documented for the plant itself. Thus, the aim of this PHD thesis is to study the VOCs emitted by the plant, rather than their fruits or flowers. A protocol was optimized for the extraction of the banana plant's VOCs. The results of the first analysis showed 11 VOCs for the Cavendish, mainly (E,E)-α-farnesene (87.90 ± 11.28 ng/µl), methyl salicylate (33.82 ± 14.29) and 6-methyl-5-hepten-2-one (29.60 ± 11.66), and 14 VOCs for the Pacific Plantain cultivars, mainly (Z,E)-α-farnesene (799.64 ± 503.15),(E,E)-α-farnesene (571.24 ± 381.70) and (E) β ocimene (241.76 ± 158.49). Most of these compounds belong to the terpenes group (8 for Cavendish, 10 for Pacific Plantain). The other compounds detected were ketones, esters and aldehydes. Eight compounds were common between the two varieties (myrcene, Z and E β-ocimene, 6-methyl-5-hepten-2 one, 6-methyl-3,5-hepadien-2-one, a-farnesene, methyl salicylate and β-ionone). This exploratory study paves the way for an in-depth characterisation of VOCs emitted by Musa plants. [less ▲]

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See detailLe cartoon. Réflexions sur la culture populaire aux États-Unis
Moreau, Timothée ULg

Conference (2017, June 16)

The aim of this paper is to propose an analysis of the cartoon and its place in popular culture from two different yet connected angles: the idea of "pop culture", linked to mass culture and its critique ... [more ▼]

The aim of this paper is to propose an analysis of the cartoon and its place in popular culture from two different yet connected angles: the idea of "pop culture", linked to mass culture and its critique/analysis by Adorno & Horkheimer and Benjamin ; and the idea of "folk culture", linked to the notion of grotesque as it is developped by Bakhtin. The main idea is that those two paths of analysis are connected through the notion of ambivalence and their link to political conceptions of a particular society and the culture that emerges from it. [less ▲]

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See detailFrammenti d’intonaci di I stile a Ostia Antica. Un lotto inedito proveniente dagli strati preparatori di un mosaico tardo-repubblicano (Domus dei Bucrani - Camera dei Nani)
Morard, Thomas ULg; Motta, Lucie ULg

Conference (2017, June 16)

Les fouilles entreprises durant les années 2002-2010 sur le site de la Schola del Traiano (IV, IV, 15) à Ostia Antica ont révélé l’existence d’une domus tardo-républicaine - la Domus aux Bucranes (60-20 ... [more ▼]

Les fouilles entreprises durant les années 2002-2010 sur le site de la Schola del Traiano (IV, IV, 15) à Ostia Antica ont révélé l’existence d’une domus tardo-républicaine - la Domus aux Bucranes (60-20 av. J.-C.) - dont le système décoratif de IIe style (pavements, enduits peints et reliefs de stuc, plafonds) est apparu exceptionnellement bien conservé dans les couches les plus profondes de la parcelle urbaine concernée. Ce système décoratif - actuellement en cours de publication - a déjà été présenté à la communauté scientifique lors de différents colloques et journées d’études internationales. Il n’est pas question d’y revenir dans le cadre de la prochaine rencontre de l’AIRPA. En revanche, nous souhaiterions y présenter un lot d’enduits peints de Ier style jetés pêle-mêle dans les couches de préparation du tapis de mosaïque de la Chambre des Nains - un oecus aménagé durant les années 40-30 au sein de cette même domus tardo-républicaine. Restés inédits jusqu’à ce jour, ces fragments comptent parmi les plus anciens jamais découverts à Ostia Antica et leur position stratigraphique - scellée entre deux pavements bien datés - offre à n’en pas douter matière à réflexion. L’ensemble de ces fragments a fait l’objet d’une documentation systématique et des analyses archéométriques ont été portées sur les mortiers et les pigments des éléments les plus significatifs. Ce sont les résultats de cette entreprise scientifique que nous souhaiterions présenter lors du colloque de l'Aquileia afin de pouvoir intégrer cet ensemble décoratif de Ier style dans un corpus plus large - une mise en relation étroite avec le matériel contemporain découvert dans le Latium. [less ▲]

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See detailGeneralized Pascal triangles for binomial coefficients of finite words
Stipulanti, Manon ULg

Conference (2017, June 16)

We introduce a generalization of Pascal triangle based on binomial coefficients of finite words. These coefficients count the number of times a finite word appears as a subsequence of another finite word ... [more ▼]

We introduce a generalization of Pascal triangle based on binomial coefficients of finite words. These coefficients count the number of times a finite word appears as a subsequence of another finite word. Similarly to the Sierpiński gasket that can be built as the limit set, for the Hausdorff distance, of a convergent sequence of normalized compact blocks extracted from Pascal triangle modulo 2, we describe and study the first properties of the subset of [0, 1] × [0, 1] associated with this extended Pascal triangle modulo a prime p. Then we create a new sequence from this extended Pascal triangle that counts, on each row of this triangle, the number of positive binomial coefficients. We show that this sequence is 2-regular. To extend our work, we construct a Pascal triangle using the Fibonacci representations of all the nonnegative integers and we define the corresponding sequence of which we study the regularity. This regularity is an extension of the classical k-regularity of sequences. [less ▲]

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See detailEnvironmental controls of biogenic volatile organic compound emissions from a grazed grassland in Dorinne, Belgium
Michel, Colin ULg; Heinesch, Bernard ULg; Bachy, Aurélie ULg et al

Poster (2017, June 15)

Despite the growing interest for oxygenated volatile organic compounds (OVOC) over the last 15 years due to their role in the atmospheric chemistry, current knowledge about OVOC exchanges by grassland and ... [more ▼]

Despite the growing interest for oxygenated volatile organic compounds (OVOC) over the last 15 years due to their role in the atmospheric chemistry, current knowledge about OVOC exchanges by grassland and the environmental factors driving them still entails gaps. However, those ecosystems represent an important part of the total earth surface (13.37%). This study conducted on a grazed grassland therefore aims to quantify OVOC exchanges over full grazing seasons in order to understand the mechanisms behind these OVOC exchanges. The Eddy Covariance method was used for flux quantification, with a PTR-MS for the measurements of OVOCs mixing ratios. It took place within the activities of the CROSTVOC project (CROp Stress VOC) and therefore gives an important attention to the stress induced fluxes. BVOC flux measurements were also performed on a smaller scale by using all-teflon automated dynamic chambers covering a surface of 0.1 m² each. [less ▲]

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See detailNorth and South: Simultaneous observations of both Jovian poles from Juno and the Hubble Space Telescope
Bonfond, Bertrand ULg; Gladstone, George R.; Grodent, Denis ULg et al

Poster (2017, June 15)

On its elongated orbit, Juno flies over the poles of Jupiter every 53.5 days. The few hours before and after the perijove offer unique opportunities to observe the whole polar region from close distance ... [more ▼]

On its elongated orbit, Juno flies over the poles of Jupiter every 53.5 days. The few hours before and after the perijove offer unique opportunities to observe the whole polar region from close distance. However, Juno’s instruments can only observe one hemisphere at a time. Fortunately, the Hubble Space Telescope points its 2.4 m mirror toward the opposite hemisphere during some of these time intervals, providing truly simultaneous observations of both poles. We compare observations from Juno-UVS with Far-UV imaging sequences from the Hubble’s Space Telescope Imaging Spectrograph (STIS). Juno-UVS acquires spectrally resolved images of 17 ms exposure every 30 s Juno spin in the 70-205 nm wavelength range, while STIS can acquire about 270 consecutive 10 s images per HST orbit in the 130-160 nm range, but without any spectral resolution. Despite some differences, these datasets are similar enough in terms of spectral coverage, temporal and spatial resolution to allow direct comparisons. On Jupiter, the magnetic field is highly asymmetric and displays significant localized anomalies. Furthermore, most processes leading to auroral emissions depend on the magnetic field magnitude, either in the equatorial plane, in the acceleration regions, or in the upper atmosphere. Investigating morphological and brightness discrepancies between the two hemispheres provides precious clues on the current systems flowing in the magnetosphere and on the charged particles acceleration mechanisms. [less ▲]

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See detailInfluence of the laboratory context and the size of the markers set on the tennis serve evaluation
Tubez, François ULg; Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg et al

Conference (2017, June 15)

The purpose of this study was to identify the influence on the tennis serve evaluation of 1/ the test environment and 2/ the number of the markers placed of the player. Two different studies were ... [more ▼]

The purpose of this study was to identify the influence on the tennis serve evaluation of 1/ the test environment and 2/ the number of the markers placed of the player. Two different studies were performed. The first compared a 4 vs. 28 marker set in a laboratory the same day. The second compared a 4 markers test in a laboratory with a 4 markers test on an official tennis court one week apart. We observed similar results between the different tests of both studies. [less ▲]

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See detailImpact of 3’-sialyllactose and Bifidobacterium crudilactis on infant feces microbial composition and virulence modulation of Escherichia coli O157:H7, using the SHIME® gastrointestinal model
Bondue, Pauline ULg

Conference (2017, June 15)

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major ... [more ▼]

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major BMO, modulated Escherichia coli O157:H7 virulence gene expressiona. In this study, the SHIME® gastrointestinal model was inoculated with 4 different treatments: 3’SL (ttm1), B. crudilactis (ttm2), 3’SL and B. crudilactis (ttm3) and CFSM from 3’SL and B. crudilactis culture (ttm4). In each section of the colon, samples were collected and analysed for short chain fatty acid (SCFA) concentration using HPLC, microbial populations using 16S rDNA metagenetic analysis and correlated with E. coli O157:H7 virulence gene expression. The results showed that SCFA levels were stable during the experiments. Metagenetic analysis showed a microbial diversity in transverse (TC) and descending colon (DC) close to feces, dominated by Bacteroides, Prevotella and Fusobacterium, while the ascending colon (AC) showed a different microbial diversity dominated by Veillonella. Ttm4 and ttm2 induced mainly a down-regulation of virulence genes: fliC in DC with ttm4, and luxS, stx1, qseA in AC, DC or TC with ttm2. Ttm1 also showed a down-regulation of fliC in DC, similar to the one observed with ttm4, but this was associated with an up-regulation of fliC and stx1 in AC or TC. Finally, ttm3 showed slight upregulation of ler, fliC and qseA in AC. These results show that ttm4 and ttm2 might have a positive effect against virulence expression of E. coli O157:H7. However, this trend has to be validated with the further replicates on the SHIME® system. [less ▲]

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

Conference (2017, June 14)

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See detailCohesive Band Model: a triaxiality-dependent cohesive model inside an implicit non-local damage to crack transition framework
Leclerc, Julien ULg; Wu, Ling ULg; Nguyen, Van Dung ULg et al

Conference (2017, June 14)

Accurate numerical prediction of the whole ductile failure process is still a challenge. The adequate numerical scheme has to concord with the physical reality composed of an initial diffuse damage step ... [more ▼]

Accurate numerical prediction of the whole ductile failure process is still a challenge. The adequate numerical scheme has to concord with the physical reality composed of an initial diffuse damage step followed by ultimate localised crack initiation and propagation. Currently, two main modelling philosophies exist. On the one hand, continuous approaches, described by damage models, are suited for diffuse damage, but are unable to represent physical discontinuities. On the other hand, discontinuous approaches are suitable to describe crack propagation behaviour and other localised processes, but fail in diffuse damage prediction of ductile materials. Moreover, they do not usually capture triaxiality effects or in other words, in-plane stretch effects, which are mandatory for accurate ductile failure simulations. To describe the ductile failure process, the numerical scheme proposed here combines both approaches and by this way, their respective advantages: an implicit non-local damage model combined with an extrinsic cohesive law in a discontinuous Galerkin finite element framework [1]. An application example of this scheme is shown on the attached figure with a comparison of the experimental force-displacement curve [2]. An implicit non-local model [3] is involved to model the initial diffuse damage stage. Upon damage to crack transition, a cohesive band [4] is used as cohesive law in order to introduce in-plane stretch effects during the crack propagation. This model is based on the assumption that all the damaging process occurs inside a band of small but finite thickness ahead of the crack surface. The strains inside this band is obtained from the neighbouring strains and from the cohesive jump. Then, the stress-state inside the band and the cohesive traction forces on the crack lips are deduced from the underlying continuum damage model. The band thickness is not a new material parameter but it is computed to ensure the energetic consistency of the numerical scheme [5]. [1] Wu L, Becker G, Noels L. Elastic damage to crack transition in a coupled non-local implicit discontinuous Galerkin/extrinsic cohesive law framework. Comput. Methods Appl. Mech. Eng. 279 (2014): 379–409 [2] Geers M., de Borst R., Brekelmans W., Peerlings R. Validation and internal length scale determination for a gradient damage model: application to short glass-fibre-reinforced polypropylene. Int. J. of Sol. and Struct. 36 (1999): 2557‑2583. [3] Peerlings R., de Borst R., Brekelmans W., Ayyapureddi S. Gradient-enhanced damage for quasi-brittle materials, Int. J. for Num. Methods in Eng. 39 (1996): 3391-3403 [4] Remmers J. J. C., de Borst R., Verhoosel C. V., Needleman A. The cohesive band model: a cohesive surface formulation with stress triaxiality. Int. J. Fract. 181 (2013): 177–18 [5] Leclerc J., Wu L., Nguyen V.D., Noels L. Cohesive band model: a cohesive model with triaxiality for crack transition in a coupled non-local implicit discontinuous Galerkin/extrinsic cohesive law framework. Int. J. for Num. Methods in Eng. (2017): In preparation. [less ▲]

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See detailGFR and drug dosage adaptation: are we still in the mist?
DELANAYE, Pierre ULg

Conference (2017, June 13)

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See detailLa révolution du roman-feuilleton
Durand, Pascal ULg

Conference (2017, June 13)

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See detailStudy of the regulation of β-lactam resistance in Enterococcus hirae
Raymackers, Alice ULg; Maréchal, Maxime; Verlaine, Olivier ULg et al

Poster (2017, June 13)

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See detailAcute renal failure: definition and detection
DELANAYE, Pierre ULg

Conference (2017, June 13)

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See detailMacro-Kinematic Approach for Shear Behaviour of Short Coupling Beams with Conventional Reinforcement
Mihaylov, Boyan ULg; Franssen, Renaud ULg

Conference (2017, June 13)

Short coupling beams in wall structures work predominantly in shear and develop complex deformation patterns. For this reason they cannot be modelled based on the classical plane-sections-remain-plane ... [more ▼]

Short coupling beams in wall structures work predominantly in shear and develop complex deformation patterns. For this reason they cannot be modelled based on the classical plane-sections-remain-plane hypothesis, and are typically designed with strut-and-tie models. However, because strut-and-tie models are inherently conservative, they can result in very large amounts of shear reinforcement (stirrups), and therefore significant construction difficulties. In addition, strut-and-tie models do not provide information about the deformation capacity of coupling beams, which is important for performance-based seismic design. To address these challenges, this paper discusses a three-parameter kinematic theory (3PKT) for the shear strength and deformation patterns of short coupling beams. The 3PKT approach is situated between simple and conservative strut-and-tie models and complex non-linear finite element (FE) models. While FE models use a large number of degrees of freedom (DOFs) to describe the deformation patterns in coupling beams, the 3PKT method is based on a kinematic model with only three DOFs. The paper presents the formulation of the model and its validation with tests. [less ▲]

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See detailLegal rare books @ the Graulich Library, University of Liège
Desseilles, François ULg

Conference (2017, June 12)

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See detailTowards Mixed-Type Modelling of Structures with Slender and Deep Beam Elements
Liu, Jian ULg; Mihaylov, Boyan ULg

Conference (2017, June 12)

Concrete frame structures often include both slender and deep beams. Deep beams possess a large shear capacity, and thus are typically used as transfer girders to carry heavy loads over large spans. The ... [more ▼]

Concrete frame structures often include both slender and deep beams. Deep beams possess a large shear capacity, and thus are typically used as transfer girders to carry heavy loads over large spans. The overloading of such members due to extreme events such as earthquakes may result in the collapse of the entire structure. To evaluate the resilience of large frame structures under extreme loading, it is necessary to model the interaction between the deep girders and the rest of the structure in an accurate and computationally effective manner. To address this issue, this paper proposes a mixed-type modelling framework by formulating an innovative 1D macro deep-beam element and coupling it with 1D slender elements. The new macro element aims to combine the accuracy of 2D micro finite elements with the simplicity of 1D macro elements. The paper summarizes the formulations of this element, based on the three-parameter kinematic theory, and integrates it into an existing global nonlinear analysis procedure to create a mixed-type modeling framework. The verification study, including a frame structure with a deep transfer girder, has shown that this approach captures the response of the frame with an accuracy similar to that of 2D micro finite elements, while requiring approx. 20% of the analysis time. [less ▲]

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See detailRemittances: a Loan Funds for Rural Economy? Illustration from the Kayes Area (Western Mali)
Yao Namé, Juste Michel ULg; Lebailly, Philippe ULg

Conference (2017, June 12)

In addition to have a direct and positive impact on reducing of food insecurity and poverty gaps in more vulnerable countries to shocks on the rainfall, the remittances received by the migrants families ... [more ▼]

In addition to have a direct and positive impact on reducing of food insecurity and poverty gaps in more vulnerable countries to shocks on the rainfall, the remittances received by the migrants families also allow them to have saving. This is what reveals the self-managed village banks of Kayes’ region, the most important emigration basin of Mali and located in strong climate variations area. However, this saving contributes less at agricultural sector finance. [less ▲]

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See detailImpact of formulation and process parameters on near-infrared spectra: Application for water determination in biopharmaceuticals
Clavaud, Matthieu ULg; Roggo, Yves; Allmendinger, Andrea et al

Poster (2017, June 11)

Traditionally, the water content of freeze-dried biopharmaceuticals is determined by time-consuming methods such as Karl Fischer titration. As a fast and non-destructive method, many studies demonstrated ... [more ▼]

Traditionally, the water content of freeze-dried biopharmaceuticals is determined by time-consuming methods such as Karl Fischer titration. As a fast and non-destructive method, many studies demonstrated the efficiency of Near-Infrared (NIR) spectroscopy for that purpose [1]. In this study, NIR was applied to different freeze-dried monoclonal antibody. The aim was to evaluate the robustness of a NIR model depending on formulation composition and process parameters of the lyophilization parameters, and the benefits of NIR when developing a freeze-drying cycle for a new pharmaceutical product. A full Design of experiments (DoE) was established in order to produce materials with various formulations and various process parameters. As a first step, a calibration model was created and validated. The model creation was based on 4 target lyophilized cycles which were manufactured to obtain samples with different water content concentration. Then, 20 lyophilized cycles were produced according to the DoE. Two levels of protein and sucrose concentration, and two levels of pressure / primary drying temperature and process time were investigated. Furthermore, several samples of each experiment stored at different temperature and relative humidity conditions were evaluated. Chemometrics using Principal Component Analysis (PCA) and Partial Least Squares (PLS) were used to evaluate the process variations and to determine the water content, respectively. NIR is capable to differentiate between different lyophilization process conditions, based on chemometrics. Robust calibration NIR model for water determination was generated against KF independent on lyophilization process parameters and formulation composition. NIR is suitable and robust method for drug product development of freeze-dried formulation. [less ▲]

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See detailBone Markers and Vascular Calcification in CKD-MBD
DELANAYE, Pierre ULg

Conference (2017, June 10)

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See detailDe Rome à la Grèce et retour : langue, pouvoir et identité sous l'Empire romain
Rochette, Bruno ULg

Conference (2017, June 10)

Une des conséquences majeures de la conquête romaine fut la diffusion du latin et de la culture romaine dans les pays soumis. Plusieurs textes de l’époque impériale pourraient faire croire que le latin ... [more ▼]

Une des conséquences majeures de la conquête romaine fut la diffusion du latin et de la culture romaine dans les pays soumis. Plusieurs textes de l’époque impériale pourraient faire croire que le latin est devenu une langue universelle utilisée à travers tout l’Empire romain : Pline l’Ancien, Plutarque, Pline le Jeune, Martial, saint Augustin. Qu’en est-il en réalité ? Rome n’a pas développé de politique linguistique. Son attitude à l’égard des problèmes sociolinguistiques fut souple et adaptée aux exigences réelles de chaque situation. Sous la République, on constate en effet une grande souplesse dans l’utilisation des langues par les magistrats romains lorsqu’ils sont en contact avec la Grèce. Même si le bilinguisme est fréquent chez les Romains de la République, dans la sphère publique, le latin conserve un rôle de langue de prestige, langue de la domination de Rome. Malgré cette souplesse, une concurrence naturelle s’est instaurée entre la langue des dominants et celle des dominés. En Occident, le latin devint l’unique langue de communication, orale comme écrite, tandis qu’en Orient, on assiste à une situation paradoxale : l’hellénisation des Romains, due au statut culturellement élevé du grec. Cette situation dichotomique n’implique toutefois pas un fractionnement en deux camps imperméables aux influences linguistiques et culturelles réciproques : ni l’Orient ni l’Occident ne sont deux domaines complètement fermés. [less ▲]

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See detailBio- and CO2-sourced polyhydroxyurethanes for hydrogels coatings, foams and high performance adhesives
Gennen, Sandro ULg; Panchireddy, Satyannarayana ULg; Grignard, Bruno ULg et al

Poster (2017, June 09)

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and ... [more ▼]

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and industrial fields. Indeed, CO2 can be viewed as a cheap, non-toxic and renewable C1 building block precursor of sophisticated organic molecules and polymers. One representative example of CO2 transformation includes the synthesis of various (bis)cyclic carbonates via CO2/epoxide coupling.1-3 Bis-cyclic carbonates were then valorized as monomers for the synthesis of series of novel low carbon footprint poly(hydroxyurethane)s (PHUs). These polymers are now exploited to produce sustainable materials including foams for thermal insulation,4 hydrogels (for potential biomedical use)5 and high performance adhesives and glues (for metal, glass and wood). [less ▲]

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See detailLa caricature par la manière : la technique des images selon les Goncourt
Stienon, Valérie ULg

Conference (2017, June 09)

Retraçant le parcours de Gavarni, évoquant leur amitié avec Rops, commentant les gravures destinées à illustrer leurs propres ouvrages, les Goncourt ne tiennent pas seulement un discours sur l’esthétique ... [more ▼]

Retraçant le parcours de Gavarni, évoquant leur amitié avec Rops, commentant les gravures destinées à illustrer leurs propres ouvrages, les Goncourt ne tiennent pas seulement un discours sur l’esthétique de l’image, ils disent aussi la médiation technique qui est à son origine. Gravure, lithographie, eau-forte ont leur place dans ce discours certes discret, mais précis et récurrent, qui conduit à s’interroger sur un savoir technique de la caricature propre aux Goncourt. La communication vise d’abord à mettre en évidence la nature et la portée de leurs propos sur les étapes matérielles intervenant dans la fabrique des images caricaturales, que ce savoir émane des sociabilités artistiques et culturelles (société des aquafortistes à laquelle est lié Rops, notamment) ou d’une expérience de participation à la presse. Il s’agit ensuite de déceler, dans l’essai, la fiction romanesque et le journal, les prises de positions manifestées à travers les valeurs, les avantages et les critiques que les Goncourt attribuent à ces techniques, à une époque où la caricature oscille entre les possibles de la gravure sur bois et les visées industrielles de la lithographie. [less ▲]

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See detailCoherent backscattering of bosonic matter-wave in the presence of disorder and interaction
Chrétien, Renaud ULg; Dujardin, Julien; Petitjean, Cyril ULg et al

Poster (2017, June 09)

Coherent backscattering, which is an enhancement of the backscattered intensity of a light going through a medium made of point-like scatterers, is known as one of the most robust interference effects. It ... [more ▼]

Coherent backscattering, which is an enhancement of the backscattered intensity of a light going through a medium made of point-like scatterers, is known as one of the most robust interference effects. It has been shown, although it is nowadays not fully understood yet, that in the presence of non-linearities, this enhancement turns to an inhibition. We propose to study that effect by means of a system in which we study the transport of a Bose-Einstein condensate through Aharonov-Bohm rings in the presence of interaction and disorder. We find that our system is indeed a good candidate to observe the coherent peak’s inversion and is also suitable for more feasible theoretical calculations than in the original case. [less ▲]

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See detailSeparable states with infinitely many separable decompositions
Neven, Antoine ULg; Bastin, Thierry ULg

Poster (2017, June 09)

Despite intense effort in the past decades, developing a general criterion for identifying separable mixed states is still an open problem. In this context, the Positive Partial Transpose (PPT) criterion ... [more ▼]

Despite intense effort in the past decades, developing a general criterion for identifying separable mixed states is still an open problem. In this context, the Positive Partial Transpose (PPT) criterion constituted an important first step towards practical entanglement detection techniques and was later used to investigate the auxiliary problem of finding separable decompositions for separable states. In this poster, we use the rank diminishing method proposed by B. Kraus et al. [PRA 61, 062302 (2000)], that exploits the PPT property to reconstruct separable decompositions, to study the separable decompositions of symmetric PPT states of 3 qubits. We show that any 3-qubit symmetric product states always belong to an optimal separable decomposition of a PPT symmetric 3-qubit state with maximal birank. [less ▲]

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See detailHeavy or not ? Analysing drum placements in hard rock music
Pirenne, Christophe ULg

Conference (2017, June 09)

The aim of this study is to verify—thanks to computer musical analysis—if downbeats and backbeats placements are different when a drummer plays in a hard rock or in a funk style. In other words, does beat ... [more ▼]

The aim of this study is to verify—thanks to computer musical analysis—if downbeats and backbeats placements are different when a drummer plays in a hard rock or in a funk style. In other words, does beat placements contribute to the heaviness of hard rock? In the field of popular music, many authors admit that there are three ways of placing the bass drum and snare drum beats with respect to metronomic time: either an anticipation, a perfect coincidence, or a slight delay. While the repertoires where the notes coincide with the metronomic time are often described as mechanical and a little cold, the anticipated notes would have a more propitious character to the dance and the delayed notes, would produce a music with a heavy character. These impressions were very often mentioned by those working on heavy metal (Waltzer, Brennan), but they have not been scientifically proven to the extent that these variations are counted in milliseconds. Two new IRCAM software, Audiosculpt and OpenMusic, now make it possible to measure very precisely these smallest variations. Thanks to this software, I will analyze the snare and bass drum hits in a few funk and hard rock songs released in 1970: James Brown's Get Up (I Feel Like Being A) Sex Machine and Super Bad (with "Jabo" Starks on drums) (which were already analyzed in Danielsen’s Presence and Pleasure, 2006). These songs will be compared with Black Night by Deep Purple (Ian Paice on drums), Uriah Heep's Gypsy (Alex Napier on drums) and Led Zepplin's Immigrant Song (John Bonham on drums). With this small sample, I will of course not be able to draw conclusions for hard rock as a whole, but if differences appear, it will be necessary to work on metadata to know if delaying the beats is a representative practice or simply a clean playing style for some drummers. [less ▲]

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See detailLa place de l’éthique dans la clinique du lien social
Englebert, Jérôme ULg; Gesché, Michèle; Kalonji, Johan

Conference (2017, June 09)

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See detailCharacterization of the pre-metastatic niche in lymph node, in experimental and clinical settings
Noël, Agnès ULg; Balsat, Cédric; Garcia Caballero, Melissa et al

Poster (2017, June 08)

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See detailFire resistance of concrete slabs acting in compressive membrane action
Molkens, Tom; Gernay, Thomas ULg; Caspeele, Robby

in Nigro, Emidio; Bilotta, Antonio (Eds.) Proceedings of the 2nd International Fire Safety Symposium - IFireSS 2017 (2017, June 08)

In building renovation, the real behaviour of reinforced concrete slabs cannot always be explained by the bending theory according to classical structural mechanics. Indeed, the bearing capacity, as ... [more ▼]

In building renovation, the real behaviour of reinforced concrete slabs cannot always be explained by the bending theory according to classical structural mechanics. Indeed, the bearing capacity, as assessed for instance by a loading test, sometimes appears to be much higher than what would be expected. This phenomenon may be caused by the activation of an arch-effect or so-called compressive membrane action (CMA) which can develop even with small vertical deformations. For a slab which is completely restrained, the presence of reinforcement becomes of lesser importance when this phenomenon is activated (except for end fields). Hence, for fire resistance purposes, it can be discussed whether reinforcement and concrete cover has a smaller influence on the bearing capacity for slabs subjected to fire which exhibit a significant concrete compressive membrane behaviour. This paper presents a loading test performed on a real concrete building which highlighted the development of CMA as the load bearing mode. It then proposes a strategy to evaluate the behaviour resulting from the development of CMA in reinforced concrete slabs at ambient and at elevated temperature based on numerical modelling. The numerical analyses are performed with the finite element software SAFIR® using a strip of layered shell elements. A plastic-damage constitutive model with an explicit transient creep formulation is used to capture the concrete behaviour at elevated temperature. [less ▲]

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See detailUps and downs for SoTL development in a collective project targeting feedback practice enhancement
Verpoorten, Dominique ULg; Detroz, Pascal ULg; Mohr, Audrey ULg et al

Conference (2017, June 08)

The “Feedback First-Year Project” (FFYP) was designed by IFRES (Institute for Training and Research in Higher Education) and the Study Guidance Service at the University of Liège (Belgium) to support ... [more ▼]

The “Feedback First-Year Project” (FFYP) was designed by IFRES (Institute for Training and Research in Higher Education) and the Study Guidance Service at the University of Liège (Belgium) to support First-Year professors’ efforts to think and act upon their current teaching and assessment practice, and possible improvements. Amongst lessons learnt, the presentation pinpoints three major risks that a collective project like FFYP might encounter. Recommendations likely to mitigate these risks are proposed, in case others would like to replicate the experience. [less ▲]

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See detailRetours d’expérience d’un partenariat Université - Agences de l'Eau pour une gestion de la qualité des eaux de surface
Deliège, Jean-François ULg; Everbecq, Etienne ULg; MAGERMANS, POL ULg et al

Conference (2017, June 08)

Un partenariat innovant a été établi entre une équipe de recherche universitaire (unité R&D de l’Aquapôle, Université de Liège) et des pouvoirs publics ayant dans leurs attributions la protection des ... [more ▼]

Un partenariat innovant a été établi entre une équipe de recherche universitaire (unité R&D de l’Aquapôle, Université de Liège) et des pouvoirs publics ayant dans leurs attributions la protection des ressources en eau et des milieux aquatiques (Agences de l’Eau françaises, Administrations wallonne et flamande). L’objectif principal de ce partenariat est la gestion des ressources par les Agences et Administrations en les dotant d’un outil innovant et opérationnel d’aide à la décision leur permettant de remplir leurs missions régionales (programmes d’intervention, SDAGE, …), nationales et internationales (DCE, rapportage européen, …). Pour atteindre cet objectif, le partenariat se base sur le développement d’une suite logicielle répondant aux attentes des opérateurs. Cette stratégie de développement, basée sur les besoins des partenaires, est au bénéfice direct de la restauration de la qualité des milieux aquatiques. [less ▲]

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See detailDiametral dimension and property Omega Bar far spaces Snu
Demeulenaere, Loïc ULg

Conference (2017, June 08)

Spaces Snu are metrizable sequence spaces defined by Jaffard in the context of multifractal analysis and signal treatment. From a functional analysis point of view, the study of these spaces points out ... [more ▼]

Spaces Snu are metrizable sequence spaces defined by Jaffard in the context of multifractal analysis and signal treatment. From a functional analysis point of view, the study of these spaces points out some topological properties, such as the facts they are locally pseudoconvex in general and locally p-convex in certain cases, Schwartz, and non-nuclear. In this talk, we focus on two topological invariants, namely the diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz) and the property "Omega Bar" (Vogt, Wagner). Firstly, we revisit a result of Aubry and Bastin giving the diametral dimension of locally p-convex spaces Snu and extend it to some non-locally p-convex spaces Snu. Secondly, we explain how these developments can be used to prove that a subclass of spaces Snu (among which the locally p-convex ones) verifes the condition Omega Bar. [less ▲]

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See detailProbing Single Molecules with the AFM: Force, Motion, Dynamics, and Function
Duwez, Anne-Sophie ULg

Conference (2017, June 07)

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See detailFire risk assessment of multi-story buildings based on fragility analysis
Gernay, Thomas ULg; Elhami Khorasani, Negar; Garlock, Maria

in Nigro, Emidio; Bilotta, Antonio (Eds.) Proceedings of the 2nd International Fire Safety Symposium - IFireSS 2017 (2017, June 07)

Recent efforts aim at assessing the fire performance of structures in a probabilistic framework. But there is still no well-established method to quantify the reliability of entire buildings. Previous ... [more ▼]

Recent efforts aim at assessing the fire performance of structures in a probabilistic framework. But there is still no well-established method to quantify the reliability of entire buildings. Previous works focused on isolated structural members, therefore not allowing for a determination of the global safety level of buildings. Here, a new methodology is developed to quantify the reliability of buildings in fire. The methodology uses Monte Carlo simulations for constructing fragility functions associated with different fire breakout locations in a building, then combines the functions to characterize the overall building conditional probability of failure, and finally incorporates the probabilistic models for intensity measure and fire occurrence likelihood. The methodology is applied to multi-story steel buildings. This work addresses fire reliability at the building scale, and therefore is useful for standardizing safety level as well as for evaluating community resilience. [less ▲]

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See detailLes Nodo/Paranodopathies
MILANTS, Christophe ULg

Conference (2017, June 06)

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See detailImparting Knowledge in Humanities. About Some Practices of Scientific Blogging on Hypothèses
Mayeur, Ingrid ULg

in Chan, Leslie; Loizides, Fernando (Eds.) Expanding Perspectives on Open Science: Communities, Cultures and Diversity in Concepts and Practices (2017, June 06)

My contribution aims to explain how a platform of electronic publishing such as OpenEdition might reach a larger public outside the academic sphere, and contribute to the revealing of research in the ... [more ▼]

My contribution aims to explain how a platform of electronic publishing such as OpenEdition might reach a larger public outside the academic sphere, and contribute to the revealing of research in the Humanities to civil society. Practices of academic blogging have expanded since the 2000's. Its potential as a vulgarization tool was acknowledged early. However, most initiatives in scientific blogging are concerned with the field of STM (Science, Technology, and Medicine). A quick overview of the classical literature about vulgarization shows that a great deal of attention is being paid to STM. As such, I propose to examine what the practices of communication are towards civil society in Humanities through Hypothèses, the blogging platform of OpenEdition. [less ▲]

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See detailIncremental-secant mean-field-homogenization method for elasto-visco-plastic materials systems
Wu, Ling ULg; Bidaine, Benoît; Adam, Laurent et al

Conference (2017, June 05)

With the increasing use of engineered and/or heterogeneous materials, there is a need to develop multi-scale methods in order to predict with accuracy structural behaviors. One computationally efficient ... [more ▼]

With the increasing use of engineered and/or heterogeneous materials, there is a need to develop multi-scale methods in order to predict with accuracy structural behaviors. One computationally efficient multi-scale method is the mean-field homogenization (MFH) one, which considers as homogenized strain and stress fields the volume average of their respective counterparts in the different composite material phases. Although originally developed for elastic materials, MFH methods have been extended to non-linear behaviors by considering a linear comparison composite (LCC). To define this LCC, the authors have developed an incremental-secant mean-field homogenization formulation, for which the residual stress and strain states reached in the phases upon a fictitious elastic unloading are considered as starting point to apply the secant method [1, 2]. The mean stress fields in the phases are then computed using isotropic secant tensors, which are naturally used to define the LCC. The incremental-secant formulation has several advantages: it can handle non-radial loading conditions, it avoids the isotropisation step required by other incremental methods, and it can handle softening behaviors in an accurate way. In this work, we present an extension of the incremental-secant mean-field homogenization to elasto-visco-plastic composite materials. The formulation can account for both first and second statistical moment estimates during the evaluation of the visco-plastic flow. The method predictions are compared to finite element (FE), to Fast-Fourier-Transform (FFT), and to experimental results, to demonstrate the accuracy of the method. References [1] Wu, L., Noels, L., Adam, L., & Doghri, I. (2013). A combined incremental-secant mean-field homogenization scheme with per-phase residual strains for elasto-plastic composites. International Journal of Plasticity, 51, 80-102 [2] Wu, L., Noels, L., Adam, L., & Doghri, I. (2013). An implicit-gradient-enhanced incremental-secant mean- field homogenization scheme for elasto-plastic composites with damage. International Journal of Solids and Structures, 50(24), 3843–3860 [less ▲]

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See detailStochastic multiscale method applied to thermo-elasticity of polycrystalline micro-structures
Wu, Ling ULg; Lucas, Vincent; Golinval, Jean-Claude ULg et al

Conference (2017, June 05)

A stochastic 3-scale approach is developed in order to predict the probabilistic behavior of micro-resonators made of polycrystalline materials. In this method, stochastic volume elements (SVEs) [1] are ... [more ▼]

A stochastic 3-scale approach is developed in order to predict the probabilistic behavior of micro-resonators made of polycrystalline materials. In this method, stochastic volume elements (SVEs) [1] are defined from Voronoï tessellations using experimental measurements of the grain size, orientation, and surface roughness [2]. For each SVE realization, the mesoscopic apparent thermo-elastic properties such as elasticity tensor, thermal conductivity tensor, and thermal dilatation tensor are extracted using a coupled homogenization theory [3, 4]. A stochastic model is then built from the homogenized properties extracted from Voronoï tessellations using a moving window technique in order to generate spatially correlated meso-scale random fields. These random fields are then used as input for stochastic finite element simulations. As a result, the probabilistic distribution of micro-resonator properties can be extracted. The applications are two-fold: either a stochastic thermo-elastic homogenization is coupled to thermo-elastic 3D models of the micro-resonator in order to extract the probabilistic distribution of the Quality factor of the micro-resonators [5], or a stochastic second-order mechanical homogenization is coupled to a plate model of the micro-resonator in order to extract the effect of the uncertainties related to the surface roughness of the polycrystalline structures [1]. References [1] Lucas, V., Golinval, J.-C., Voicu, R., Danila, M., Gravila, R., Muller, R., Dinescu, A., Noels, L., & Wu, L. (in press). Propagation of material and surface profile uncertainties on MEMS micro-resonators using a stochastic second-order computational multi-scale approach. International Journal for Numerical Methods in Engineering. [2] Ostoja-Starzewski, M., Wang, X. (1999) Stochastic finite elements as a bridge between random material microstructure and global response, Computer Methods in Applied Mechanics and Engineering, 168, 35-49, 1999 [3] Temizer, I., Wriggers, P. (2011) Homogenization in finite thermoelasticity, Journal of the Mechanics and Physics of Solids 59 (2), 344-372 [4] Nguyen, V. D., Wu, L., Noels, L. (in press). Unified treatment of boundary conditions and efficient algorithms for estimating tangent operators of the homogenized behavior in the computational homogenization method. Computational Mechanics. [5] Wu, L., Lucas, V., Nguyen, V. D., Golinval, J.-C., Paquay, S., & Noels, L. (2016) A Stochastic Multi-Scale Approach for the Modeling of Thermo-Elastic Damping in Micro-Resonators. Computer Methods in Applied Mechanics & Engineering, 310, 802-839. [less ▲]

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See detailConstraints on Landslide-Climate Research Imposed by the Reality of Fieldwork in Central Africa
Monsieurs, Elise ULg; Kirschbaum, Dalia B.; Thiery, Wim et al

Conference (2017, June 05)

Climate change is reported to be ‘very likely’ associated with an increasing trend in extreme rainfall intensity over the tropics. Its impact on the timing of landslide initiation however remains poorly ... [more ▼]

Climate change is reported to be ‘very likely’ associated with an increasing trend in extreme rainfall intensity over the tropics. Its impact on the timing of landslide initiation however remains poorly understood. Central Africa, located in the tropics, has repeatedly been highlighted as lacking landslide catalogs and landslide-climate studies. We present a research approach, adapted to the data-poor context of Central Africa, to study regional rainfall controls on landslides conditioned by climate change. Preliminary results are presented, including a description of the current rain gauge network installed, an inventory of 83 landslide events with known date and location, and a case study of a landslide occurrence. We show that the underrepresentation of Central Africa in current landslide-climate research is related to the dearth of adequate rainfall ground monitoring networks and spatiotemporal data on landslide occurrence, rather than to the lack of landslide occurrence. Research constraints imposed by the context of Central Africa are highlighted. In presenting this challenging research setting, our aim is not to discourage research in the region, but to identify lessons learned from previous field work and emphasize the abundant opportunities inviting natural hazard studies in Central Africa. [less ▲]

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See detailSeparation, identification and quantification of peptidoglycan fragments by zwitterionic hydrophilic interaction chromatography and capillary electrophoresis coupled to mass spectrometry
Boulanger, Madeleine ULg; Delvaux, Cédric ULg; Raymackers, Alice ULg et al

Poster (2017, June 05)

Bacterial peptidoglycan-derived muropeptides and peptides are soluble fragments acting as messengers in diverse cell-signalling events. As the peptidoglycan wall is a key target of antibiotics, bacteria ... [more ▼]

Bacterial peptidoglycan-derived muropeptides and peptides are soluble fragments acting as messengers in diverse cell-signalling events. As the peptidoglycan wall is a key target of antibiotics, bacteria have developed specific resistance mechanisms based on the detection of these fragments inside their cytoplasm. In our model strain, Bacillus licheniformis, the peptidoglycan dipeptide m-A2pm-D-Glu triggers a beta-lactamase induction. However, the nature and the concentration of cytoplasmic peptidoglycan fragments leading to the dipeptide formation are unknown. Additionally, the muropeptides sensing is involved in the innate immune response toward bacterial invasion and is therefore of considerable importance in eukaryotes self-defence functions. In this context, the development of reliable analytical methods aiming to identify and quantify those fragments in complex samples are of major interest. [less ▲]

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See detailTransitive structures with generic/indefinite O-arguments in English: An emergent antipassive construction?
Lambert, Céline ULg; Plumat, Coraline ULg; Van linden, An ULg

Conference (2017, June 03)

This corpus study focuses on transitive structures that contain generic/indefinite O-arguments in Present-day English, cf. (1) featuring things and (2) featuring folks, and investigates to what extent ... [more ▼]

This corpus study focuses on transitive structures that contain generic/indefinite O-arguments in Present-day English, cf. (1) featuring things and (2) featuring folks, and investigates to what extent these show reduced transitivity and backgrounded discourse status in the sense of Hopper and Thompson (1980). As can be observed in (1) and (2), the constructions studied show a high degree of transitivity on most of the transitivity parameters proposed in Hopper and Thompson (1980), apart from the individuation of the O-argument. For example, (1) and (2), score high in terms of kinesis, volitionality, agency and affirmation, but their O-arguments have generic reference. In addition, the constructions examined generally form part of backgrounded discourse. In (1) and (2), rather than pushing the story-line further, the structures render descriptions of a person’s character and behaviour that make them eligible for a specific task or job. (1) Iyad Allawi is strong and tough with a hard edge. He’ll make things better. (USnews) (2) The fact that he cut such a handsome figure tended to make folks forget that he didn’t know it all. He looked and acted like a man destined for great things, and most people tend to be swayed by a man’s opinion of himself. (USbooks) More generally, the data suggest that in the constructions studied, the noun phrases coding O-participants merely function as filler elements, used to satisfy the argument-structure requirements imposed by the verb. In view of them realizing non-individuated O-arguments in backgrounded stretches of discourse, we propose that the structures focused on could be analysed as emergent (Hopper 1991) antipassive constructions, which won’t necessarily develop into canonical antipassive constructions over time. In fact, there is a good chance that they will never shed overt expression of the (original) O-argument. In addition to things and folks, this study examines the nouns people, stuff and shit(s) in the role of O-participant, thus factoring in an animacy variable (animate people, folks versus inanimate things, stuff and shit(s)), as well as a register variable (neutral people, things versus informal to slang folks, stuff, and shit(s)). Specifically, the queries used allowed for up to two intervening words between any verb form and the noun studied; for each noun 250 relevant examples were analysed, drawn from random samples from the US subcorpora of WordBanksOnline. References Hopper, P. 1991. On some principles of grammaticization. In Traugott & Heine (eds), Approaches to Grammaticalization, vol. 1: Focus on Theoretical and Methodological Issues, 17-35. Amsterdam: John Benjamins. Hopper, P. & S.A. Thompson. 1980. Transitivity in grammar and discourse. Language 56 (2): 251-299. [less ▲]

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See detailViolences sexuelles dans les relations amoureuses des adolescents : quelles perspectives de prévention et d’intervention ?
Courtain, Audrey ULg; Glowacz, Fabienne ULg

Conference (2017, June 02)

La présente communication a pour objectif de faire un état des lieux des violences sexuelles (VS) que les adolescents et jeunes adultes peuvent agir ou subir dans leurs relations amoureuses, de mettre ... [more ▼]

La présente communication a pour objectif de faire un état des lieux des violences sexuelles (VS) que les adolescents et jeunes adultes peuvent agir ou subir dans leurs relations amoureuses, de mettre cette VS en perspective avec les attitudes que les jeunes ont vis-à-vis de celle-ci, et de questionner les manifestations traumatiques. Un questionnaire a été administré en passation groupale à des étudiants (N>1000, 15-25 ans) en Belgique francophone reprenant trois outils : le CADRI (Conflict in Adolescent Dating Relationships Inventory ; Wolfe et al., 2001), l’ATDVS (Attitudes Toward Dating Violence Scale ; Price & Byers, 1999) et l’échelle d’Horowitz sur l’impact des événements traumatisants (Horowitz et al, 1979 ; Brunet et al., 2003). Après un descriptif des prévalences de VS agies et subies, ainsi que des attitudes des participants, et des manifestations traumatiques, nous traiterons des liens entre les VS et les attitudes afférentes, en termes de perpétration et de victimisation. Aussi, nous questionnons les liens entre les attitudes relatives aux VS et les manifestations traumatiques. Tout au long de nos analyses, les différences de genre seront considérées. Les résultats permettront d’envisager de nouvelles perspectives préventives et cliniques ajoutant à l’approche des violences psychologiques et physiques celle des violences sexuelles dans les relations amoureuses des adolescentes analysées sous le prisme des attitudes et du trauma [less ▲]

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See detailThe diachrony of polysemy networks. Cognitive and cultural motivations for the semantic extension of time-related lexemes in Ancient Greek and Ancient Egyptian – Coptic
Georgakopoulos, Athanasios ULg; Polis, Stéphane ULg

Conference (2017, June 02)

This paper aims at contrasting the semantic extension of time-related lexemes in Ancient Greek and Ancient Egyptian – Coptic in order to identify shared cognitive motivations and to assess the potential ... [more ▼]

This paper aims at contrasting the semantic extension of time-related lexemes in Ancient Greek and Ancient Egyptian – Coptic in order to identify shared cognitive motivations and to assess the potential impact of cultural factors on the evolution of this lexical field in both languages. In doing so we first take as a point of departure semantic networks inferred from synchronic polysemy data in large language samples, such as Youn et al. (2016) and CLICS (List et al., 2014). In a second step, we identify the lexemes that lexicalize meanings associated with DAY/DAYTIME/TIME in Ancient Greek (8th – 1st c. BC) and Ancient Egyptian (26th c. BC – 10th c. AD), two languages with significant diachronic material. The data are extracted from dictionaries, grammars, and from the Perseus digital library (http://www.perseus.tufts.edu/hopper/) for Ancient Greek, and from the Thesaurus Linguae Aegyptiae (http://aaew.bbaw.de/tla/), the Ramses corpus (http://ramses.ulg.ac.be), and Coptic etymological dictionaries for Ancient Egyptian. Based on this diachronic material we describe the semantic extensions of time-related lexemes and map them onto the synchronic polysemy networks. In a final step, our results are checked against The Catalogue of Semantic Shifts in the Languages of the World (http://semshifts.iling-ran.ru/). Fig. 1 exemplifies how meaning extension may be added to polysemy networks. A diachronic analysis reveals that, for the Ancient Greek lexical unit hṓra, the meaning ‘time’ is historically prior to the meaning ‘hour.’ Accordingly, we may add a directed arrow representing the directionality of change from ‘time’ to ‘hour.’ Similarly, Ancient Egyptian data points to an extension of the polysemy network of the lexical unit tr – originally meaning ‘time,’ ‘moment in time’ – to ‘season’ (cf. Coptic ⲧⲏ tê ‘time, season’). One can then describe the cognitive motivations (e.g., metaphor, metonymy, etc.) for meaning extensions and analyze the cultural factors underlying the observed evolutions. In the case of the Greek word hṓra, for instance, a metonymic motivation between TIME and HOUR could be established. Finally, the analysis can be refined by searching in the corpus bridging contexts that allow such extensions of the polysemy networks of content items. The approach adopted here is closely connected to the semantic map method, which has recently shifted its focus from the study of the polysemic patterns of grammatical morphemes (in this respect, see, e.g., Haspelmath, 2003) to the study of lexical items (e.g., François, 2008, Perrin, 2010, Wälchli and Cysouw 2012, and Georgakopoulos et al., 2016). As such, our paper has also a methodological bearing on the semantic map model, both because of its focus on content words and on diachrony (see van der Auwera, 2008; Narrog, 2010; Luraghi, 2014; Juvonen and Koptjevskaja-Tamm, 2016). All things considered, this diachronic take on the polysemic networks of lexemes belonging to a particular semantic domain offers a new perspective on dealing with the question of the directionality of meaning change. [less ▲]

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See detailWhat do Comics do to Graphic Novels? Remediating Old Comics
Crucifix, Benoît ULg

Conference (2017, June 02)

A widely debated object, the graphic novel has catalyzed anxieties about changes within the comics world, postulating something of a radical break with its past. Albeit with great nuance, Jan Baetens and ... [more ▼]

A widely debated object, the graphic novel has catalyzed anxieties about changes within the comics world, postulating something of a radical break with its past. Albeit with great nuance, Jan Baetens and Hugo Frey put forward the bold argument that graphic novels constitute not only a “special type of comics” or a genre, but perhaps even a new medium. At the same time, they also repeatedly hint at how graphic novels are traversed by references to the past of comics, at times lapsing into a constraining retromania. This talk seeks out to dig into these questions by focusing on the remediation of the comic strip within two recent American graphic novels: Daniel Clowes’s "Ice Haven" and Cole Closser’s "Little Tommy Lost". Both works recuperate the medial body of the comic strip within their structure, demonstrating a self-reflexive historical awareness that redraws ‘old’ comics into its cultural make-up. Considering the remediation of the comic strip within the graphic novel, this talk analyzes how remediation might work ‘within’ a medium, reinvigorating the concept in a historical but medium-specific perspective that accounts for the dynamically changing identities of a medium. [less ▲]

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See detailMass spectrometry imaging of small xenobiotics on Danio rerio : influence of molecular profiles modification as potential localization asset
Tiquet, Mathieu ULg; Muller, Marc ULg; De Pauw, Edwin ULg

Poster (2017, June 02)

MALDI Mass spectrometry often fail to locate small xenobiotics present in low concentration in tissues due to ion suppression effect. This new method compare tissues of contaminated zebrafish to controles ... [more ▼]

MALDI Mass spectrometry often fail to locate small xenobiotics present in low concentration in tissues due to ion suppression effect. This new method compare tissues of contaminated zebrafish to controles with the statistical tool called receiver operating characteristic. Results cannot directly locate the xenobiotic but can indicate which tissues are affected by the contamination and thus give a hint on the biolocalization. [less ▲]

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See detailIntérêt de la cryothérapie chez le sportif
Kaux, Jean-François ULg

Conference (2017, June 02)

La thérapie par le froid est couramment utilisée comme une procédure pour soulager les symptômes douloureux, particulièrement dans les maladies inflammatoires. La cryothérapie corps entier consiste en une ... [more ▼]

La thérapie par le froid est couramment utilisée comme une procédure pour soulager les symptômes douloureux, particulièrement dans les maladies inflammatoires. La cryothérapie corps entier consiste en une exposition à l’air très froid (maintenue entre -110 °C et -140 °C) en cryochambre spéciale, généralement pendant 2 minutes. En médecine sportive, la cryothérapie corps entier a gagné en popularité comme méthode améliorant la récupération ou accélérant la guérison des blessures. Malheureusement, il n’y a peu de documents relatifs à l’application de ce traitement chez les athlètes. [less ▲]

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See detailRôle des psychologues spécialisés en neuropsychologie auprès des patients en état de conscience altérée : état des lieux et perspectives
Wauquiez, Grégoire; Radiguer, François; Stephan, Julie et al

Poster (2017, June 02)

Avec les progrès des techniques de soins intensifs et de réanimation, de nombreuses personnes survivent à des lésions cérébrales graves et peuvent notamment présenter dans les suites un état de conscience ... [more ▼]

Avec les progrès des techniques de soins intensifs et de réanimation, de nombreuses personnes survivent à des lésions cérébrales graves et peuvent notamment présenter dans les suites un état de conscience altérée. La création depuis les années 2000 d’unités spécialisées dites “Etats Végétatifs Chroniques / Etats Pauci-Relationnels” témoigne du développement de l’offre de soin dédiée à ces problématiques complexes. De plus en plus d’études scientifiques sont également publiées chaque année sur le sujet de l’évaluation et de la prise en charge de ces patients (ref1). La question du diagnostic d'état d'éveil non répondant ou d'état de conscience minimale constitue entre autres un enjeu majeur pour proposer à ces patients une stimulation adaptée (ref2). Néanmoins, ce domaine d’intervention paraît aujourd'hui encore modérément investi par les psychologues spécialisés en neuropsychologie, professionnels qui semblent pourtant à même d’y contribuer de manière pertinente de par leurs connaissances et leurs compétences (ref3). Où en sont les pratiques sur le terrain et quelles seraient les perspectives de développement à envisager ? Pour tenter de répondre à ces questions, nous avons diffusé une enquête en ligne à destination des neuropsychologues francophones (Belgique, France, Québec et Suisse) en vue de recueillir des données sur la formation, les activités et les attentes de nos collègues. En parallèle, nous avons réalisé une brève revue de la littérature scientifique sur le sujet et sollicité l’avis d’experts concernant les pratiques et spécificités des neuropsychologues auprès de ces patients. Nos premiers résultats mettent en avant 1°) qu’un nombre non négligeable de psychologues spécialisés en neuropsychologie travaillent auprès de patients en état de conscience altérée, 2°) qu'ils ont des connaissances et une pratique spécifique leur permettant d'apporter un réel bénéfice dans le diagnostic et la prise en charge interdisciplinaire de ces patients, et 3°) que le sujet des états de conscience altérée mériterait une place plus importante dans la formation initiale et continue des neuropsychologues afin de contribuer au développement d’une pratique de haut niveau auprès de ces patients tout à fait particuliers. Ces résultats nous feront discuter des questions de la formation initiale, des variétés de pratiques et de la perspective d’une enquête élargie aux pays non francophones. [less ▲]

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See detailCellwise robust regularized discriminant analysis
Aerts, Stéphanie ULg; Wilms, Ines

Conference (2017, June 02)

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are more ... [more ▼]

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are more variables than observations in the groups, the usual estimates are singular and cannot be used anymore. Assuming homoscedasticity, as in LDA, reduces the number of parameters to estimate. This rather strong assumption is however rarely verified in practice. Regularized discriminant techniques that are computable in high-dimension and cover the path between the two extremes QDA and LDA have been proposed in the literature. However, these procedures rely on sample covariance matrices. As such, they become inappropriate in presence of cellwise outliers, a type of outliers that is very likely to occur in high-dimensional datasets. We propose cellwise robust counterparts of these regularized discriminant techniques by inserting cellwise robust covariancematrices. Ourmethodologyresultsinafamilyofdiscriminantmethods that are robust against outlying cells, cover the gap between LDA and QDA and are computable in high-dimension. [less ▲]

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See detailAccessibilité/disposition au traitement et processus de désistance : articulation des principes théoriques du Good Lives Model à la réalité clinique
Devillers, Bérengère ULg; Henrard, Noémie ULg; Corneille, Serge ULg

Conference (2017, June 02)

Le Good Lives Model (GLM) s’attèle au développement et à l’amélioration du bien-être et d’une identité personnelle positive en tenant compte des caractéristiques de l’environne- ment. Il s’agit notamment ... [more ▼]

Le Good Lives Model (GLM) s’attèle au développement et à l’amélioration du bien-être et d’une identité personnelle positive en tenant compte des caractéristiques de l’environne- ment. Il s’agit notamment de guider l'individu dans l’élaboration d’un plan de vie en prenant en compte ses besoins humains fondamentaux ainsi que les ressources et compétences nécessaires pour y arriver. Le G.L.M. va donc inciter l’acquisition de ressources et la réduc- tion de la récidive, en tant que celle-ci constitue un obstacle au bien-être et à l’accomplisse- ment personnel. Plus spécifiquement, le G.L.M. est efficace pour surmonter certaines limites inhé- rentes aux approches traditionnelles grâce, notamment, au soutien du processus de désis- tance, fruit d’interactions complexes entre des facteurs subjectifs, environnementaux et sociaux, et à l’amélioration de la disposition/accessibilité au traitement qui renvoie à la présence de caractéristiques (états et dispositions) dans le chef de l’usager, mais aussi de la situation thérapeutique. Il est donc de la responsabilité des intervenants d’adapter leurs traitements aux besoins des usagers plutôt que d’exiger des usagers qu’ils adaptent leurs besoins aux compétences limitées des intervenants. Lors de cette communication, nous souhaitons, d’une part, articuler ces différents repères théoriques à un suivi thérapeutique, d’un auteur d’infractions à caractère sexuel, réalisé en milieu pénitentiaire et, d’autre part, interroger et souligner les effets potentiels de la posture professionnelle sur les facteurs subjectifs impliqués dans la désistance. [less ▲]

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See detailPensées défaitistes chez les personnes atteintes d'une schizophrénie et présentant des symptômes négatifs persistants
Thonon, Bénédicte ULg; Laroi, Frank ULg

Poster (2017, June 02)

Intro : Les symptômes négatifs de la schizophrénie, particulièrement ceux concernant le dé ficit motivationnel, sont associés à un faible fonctionnement quotidien. Ces symptômes se sont montré liés à des ... [more ▼]

Intro : Les symptômes négatifs de la schizophrénie, particulièrement ceux concernant le dé ficit motivationnel, sont associés à un faible fonctionnement quotidien. Ces symptômes se sont montré liés à des attitudes dysfonctionnelles, telles que les pensées défaitistes concernant l’atteinte de buts. Ce lien a été observé dans divers types d’échantillons, tant au cours des premières décompensations que dans la maladie chronique, mais non chez les personnes présentant des symptômes négatifs persistants (SNP). La présente étude vise à é valuer le lien entre les pensées défaitistes et les symptômes négatifs chez des personnes diagnostiquées avec une schizophrénie et des SNP. Un autre objectif est d’évaluer le lien entre la modification des pensées défaitistes et la réduction des symptômes négatifs après une intervention psychosociale. Méthode : Cinquante-et-un participants ont suivi l’intervention « Motivation and Engagement Training » pendant 9 mois. Ils ont été évalués avant et après l’intervention sur base des échelles suivantes : Negative Symptom Assessment (NSA), Brief Negative Symptom Scale (BNSS), Clinical Assessment Interview for Negative Symptom (CAINS), Defeatist Performance Beliefs. Résultats : En ligne de base, les pensées défaitistes n’étaient pas significativement corrélées aux symptômes négatifs, excepté au facteur Amotivation de la BNSS. La modification des pensées défaitistes s’est montrée cependant modérément et positivement corrélée au changement de l’amotivation mesurée par la BNSS (mais pas via les autres mesures). Discussion : Ces résultats soulignent la nécessité d’élargir les cibles des intervenions psychosociales à d’autres facteurs liés aux symptômes négatifs d’amotivation. [less ▲]

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See detailThéories implicites de personnalité et mécanismes de désengagement moral : Analyse différentielle des cognitions d’auteurs présumés selon la culpabilité auto-révélée et la qualification judiciaire des faits d’infractions sexuelles sur mineurs
Garcet, Serge ULg

Conference (2017, June 02)

Les unités cognitivo-affectives qui sous-tendent l’adaptation à l’environnement, et particulièrement les mécanismes d’évaluation, de réflexion et de régulation des comportements et de leurs conséquences ... [more ▼]

Les unités cognitivo-affectives qui sous-tendent l’adaptation à l’environnement, et particulièrement les mécanismes d’évaluation, de réflexion et de régulation des comportements et de leurs conséquences, sont des variables à prendre en compte lorsque l’on aborde le passage à l’acte et la réitération des comportements d’agression sexuelle. Une meilleure compréhension de ces processus et de leurs contenus (catégorisations, théories implicites de personnalité, scripts, schémas) affine l’approche des comportements d’agression sexuelle. Elle améliore également l’intervention judiciaire, par une meilleure prise en compte des risques potentiels, et l’action thérapeutique par l’identification de leviers susceptibles d’initier le changement. Parmi ces mécanismes autorégulateurs, les processus de justification et de reconstruction cognitive qui inhibent les comportements perçus comme immoraux (Sykes et Matza ; Bandura & al. ; Barriga et Gibbs ), et regroupés sous le label de « mécanismes de neutralisation morale » sont particulièrement intéressants puisqu’ils ont pour fonction d’atténuer la dissonance cognitive chez l’auteur et rendre acceptable voire légitimer les comportements d’agressions sexuelles. Ces mécanismes de désengagement peuvent être identifiés au travers des théories implicites de personnalité (TIP) observables dans les discours des auteurs à l’égard de leurs victimes. La présente étude a consisté à analyser un ensemble de 470 corpus de justifications recueillis lors des premières auditions policières de 60 auteurs présumés d’infractions à caractère sexuel sur mineurs, en aveu ou non, afin d’identifier les différentes représentations (TIP) auxquelles ils ont eu recours dans le but d’envisager comment ces représentations implicites alimentent par leurs contenus les processus cognitifs de désengagement moral. La qualification présumée des faits et le moment judiciaire (information ou instruction) durant lequel se déroule l’audition ont aussi été pris en compte afin de mesurer l’éventuelle incidence de ces variables sur les modes préférentiels de justification et de neutralisation. Chacune des auditions a été analysée au moyen d’une grille d’interprétation construite sur la base des théories implicites de la personnalité consacrées aux agresseurs sexuels de Ward & Keenan (1999). 470 corpus ont été identifiés et regroupés selon les différentes théories implicites de personnalité du modèle de Ward & Keenan. Les différents corpus ont également été croisés avec les échelles des cognitions d’Abel & al. (1989) et les formes du déni (Facets of Sexual Offender Denial - FoSOD) de Schneider et Wright (2001). Dans un second temps, les différents contenus implicites associés aux corpus ont été mis en perspective avec les mécanismes de neutralisation morale mais aussi avec la nature des faits reprochés, le moment judiciaire et la présence d’aveu ou non afin de dégager d’éventuels modes préférentiels de désengagement. Les résultats obtenus mettent en évidence l’existence de différents processus de justification qui sont autant d’illustration des processus de désengagement moral des auteurs d’infraction à caractère sexuel que ce soit dans une perspective d’atténuation de la culpabilité face au système judiciaire ou de réduction de la dissonance cognitive. Il existe également des profils différentiels de théories implicites de personnalité et de processus de neutralisation morale entre les sujets selon qu’ils soient en aveux ou non et selon la qualification des faits incriminés. Le moment de la procédure durant lequel le sujet a été auditionné n’a par contre pas d’impact. L’étude contribue ainsi au développement d’outils psychométriques susceptibles de rendre compte de la façon dont les auteurs d’infractions sexuelles se représentent et justifient leurs comportements à l’égard des victimes mais elle ouvre également des perspectives par rapport à l’analyse que nous pouvons faire du discours de l’auteur, de son éventuelle crédibilité par la prise en compte des mécanismes préférentiels de désengagement de sa responsabilité. [less ▲]

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See detailSexting : pratiques adolescentaires à risque de violences ?
Glowacz, Fabienne ULg

Conference (2017, June 02)

La violence cybernétique dans les couples d’adolescents est une forme de violence recourant aux nouvelles technologies pouvant comprendre deux versants, l’un d’agression (impliquant par exemple des ... [more ▼]

La violence cybernétique dans les couples d’adolescents est une forme de violence recourant aux nouvelles technologies pouvant comprendre deux versants, l’un d’agression (impliquant par exemple des insultes, humiliations et menaces en ligne vis-à-vis du partenaire) et l’autre de contrôle (impliquant la surveillance en ligne des activités en ligne et hors-ligne du partenaire). Dans le cadre de cette communication, c’est la pratique de sexting, les dynamiques relationnelles et les risques s’y rapportant qui seront abordés à partir d’une part des données d’une enquête menée auprès d’une population d’adolescents et d’autre part, de présentations de vignettes cliniques. La pratique de sexting lors de l’adolescence et le début de l’âge adulte jouerait un rôle dans l’expression de la sexualité et le recours aux textos et sextos serait relativement répandu tant chez les garçons que chez les filles. Il peut dès lors s’inscrire en tant que modalités d’interactions relationnelles et sexuelles négociées passant par la voie de l’image mettant en lumière l’ambiguité de « la proximité et de l’intimité à distance ». Il a cependant été montré que le sexting peut être associé à des conduites à risques et du harcèlement sexuel. Au terme de la présentation, nous envisagerons comment construire la prévention et les interventions par rapport à ces nouvelles formes de dynamiques relationnelles et de violences sexuelles. [less ▲]

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See detailPRP & arthrose
Kaux, Jean-François ULg

Conference (2017, June 02)

Les injections de Plasma Riche en Plaquettes (PRP) dans le traitement de diverses pathologies arthrosiques semblent se développer comme un nouveau traitement de pointe. Sur base de ce constat, nous avons ... [more ▼]

Les injections de Plasma Riche en Plaquettes (PRP) dans le traitement de diverses pathologies arthrosiques semblent se développer comme un nouveau traitement de pointe. Sur base de ce constat, nous avons relevé dans la littérature, les conditions de protocoles d’optimisation du traitement du PRP dans les lésions cartilagineuses. [less ▲]

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See detailAgression sexuelle lors d’un conflit dans les relations amoureuses : Un statut spécifique
Courtain, Audrey ULg; Glowacz, Fabienne ULg

Poster (2017, June 01)

Le CADRI (Conflict in Adolescent Dating Relationships Inventory ; Wolfe et al., 2001) est un questionnaire portant sur les fréquences de violence dans les relations amoureuses (VRA), dont la dimension ... [more ▼]

Le CADRI (Conflict in Adolescent Dating Relationships Inventory ; Wolfe et al., 2001) est un questionnaire portant sur les fréquences de violence dans les relations amoureuses (VRA), dont la dimension sexuelle. Il s’inscrit dans la continuité du CTS-2 (Conflict Tactics Scale ; Strauss et al., 1996) utilisé dans le cadre des violences conjugales, ces deux outils ayant été conçus sur base de la théorie du conflit. Or, celle-ci postule que « conflict is an inevitable part of human association, whereas violence as a tactic to deal with conflict is not. » (Strauss et al., 1996, p.284). Ainsi, agresser sexuellement sa petite amie ou son petit ami, est-ce du ressort d’un contexte conflictuel, ou bien de la violence sexuelle : quelle en est la spécificité ? Méthodologie : Deux versions du CADRI ont été administrées en passation groupale à des étudiants (N>200, 15-23 ans) en Belgique francophone : la première étant une version modifiée où la consigne introductive ne circonscrivait pas les items de violence à du conflit, la seconde étant la version-type délimitant les items de violence à un contexte de conflit. Résultats : Les scores diffèrent selon la version-type et la version modifiée du CADRI, et selon que nous nous situons sur le versant de la perpétration ou de la victimisation sexuelle, ainsi que selon le sexe des répondants. Discussion : Alors que l’importance des consignes introductives est globalement reconnue, l’implication conceptuelle de certaines est loin d'être négligeable pour la description, la compréhension et la prévention de l'agression sexuelle comme VRA. [less ▲]

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See detailLa reconnaissance de la maladie mentale en psychopathologie légale
Englebert, Jérôme ULg

Conference (2017, June 01)

De nombreux programmes thérapeutiques recommandent d’orienter la thérapie sur la reconnaissance du trouble ou de la maladie. Nous évoquerons cette problématique dans le cadre de la psychiatrie légale ... [more ▼]

De nombreux programmes thérapeutiques recommandent d’orienter la thérapie sur la reconnaissance du trouble ou de la maladie. Nous évoquerons cette problématique dans le cadre de la psychiatrie légale (particulièrement avec des patients présentant un diagnostic de schizophrénie et ayant commis des faits de délinquance sexuelle). Avoir pour objectif de réduire l’anosognosie pose la question des représentations du trouble et de la connaissance de ces phénomènes complexes. La distinction des perspectives en première et troisième personnes est un apport récent et décisif de la phénoménologie à la psychologie clinique et à la psychopathologie (Parnas, Sass & Zahavi, 2012). La perspective en troisième personne consiste en l’attribution, depuis une position externe, de signes cliniques repérés indépendamment du ressenti exprimé par le patient. L’exemple typique de ces signes est le délire et l’hallucination du schizophrène. Ces symptômes cristallisent précisément les difficultés qu’éprouve le sujet à se reconnaitre affecté du trouble. La perspective en première personne concentre, quant à elle, son attention sur l’expérience subjective exprimée par le patient. Si l’on reprend le cas de la schizophrénie, ce sont la « perte de l’évidence naturelle » des choses ou un « sentiment de diminution du soi » qui sont verbalisés. Ce pas de côté de la vision omnisciente du médical, assumant une remise en cause du pouvoir de domination qu’entraine la perspective en troisième personne, se révèle être un outil psychothérapeutique pertinent. Il désacralise le problème de l’anosognosie et ouvre la voie à une perspective intersubjective, à une « co-reconnaissance ». [less ▲]

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See detailAnalyse des pratiques, des représentations et de la tolérance en matière de sexualité adolescente au regard de la consommation pornographique sur Internet
Garcet, Serge ULg; Eloy, Noémie ULg

Poster (2017, June 01)

L’hyper-sexualisation actuelle de l’espace public et la consommation de matériel pornographique semble avoir un impact sur le développement psycho-sexuel adolescent, la tolérance aux pratiques sexuelles ... [more ▼]

L’hyper-sexualisation actuelle de l’espace public et la consommation de matériel pornographique semble avoir un impact sur le développement psycho-sexuel adolescent, la tolérance aux pratiques sexuelles parallèles et l’expérimentation précoce et variée de ces pratiques. Différentes recherches ont été menées auprès d’un panel de plus de 300 adolescents. Les résultats, présentés en synthèses sous forme d’un poster, permettent de rendre une photographie actuelle des pratiques sexuelles adolescentes au regard de la littérature scientifique. Il apparait notamment que 80% des jeunes interrogés se disent consommateurs réguliers de contenus pornographiques. Cette consommation pornographique semble en lien avec le fait d’être plus ouvert aux questions en matière de sexualité, la diversification des pratiques sexuelles, le nombre de partenaires sexuels ou encore le recours à des relations alternatives de types « fuckfsriends » ou « sexting ». La mise en parallèle des pratiques adolescentes en matière de sexualité et de la consommation de pornographie internet a également permis de tenter de répondre à la double interrogation ; L’hyper-sexualisation de l’espace public augmente-t-il la tolérance des jeunes en matière de sexualité ? La pornographie internet influence-t-elle les représentations et pratiques des adolescents en matière de sexualité ? Par extension, cette compilation de résultats, nous a amené à envisager le lien existant entre la consommation précoce et accrue de pornographie chez les adolescents, leur seuil de tolérance aux différentes pratiques sexuelles mises en scène dans ces contenus et la propension que ces jeunes ont à expérimenter ces pratiques, parfois déviantes, au risque de s’inscrire dans la transgression. [less ▲]

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See detailThe acquisition of nouns in children with Specific Language Impairment
Krzemien, Magali ULg; Thibaut, Jean-Pierre; Zghonda, Hela ULg et al

Poster (2017, June 01)

Specific Language Impairment (SLI) is a neurodevelopmental disorder that affects the language development of children with a normal nonverbal intelligence and no history of neurological disorder nor ... [more ▼]

Specific Language Impairment (SLI) is a neurodevelopmental disorder that affects the language development of children with a normal nonverbal intelligence and no history of neurological disorder nor auditory deficit (Leonard, 2014). A difficulty linked to SLI is the poor language productivity and the input dependency that children display compared with their peers: they tend to use a limited variety of verbal forms compared to younger siblings (Conti-Ramsden & Jones, 1997) and use a high proportions of the same verbs as their mothers (Jones & Conti-Ramsden, 1997). Recent studies suggested that these disorders could be linked to a deficit in generalizing constructions (constructions being units of language that vary in complexity and abstractness, Tomasello, 2009) from the input (Leroy et al., 2013). Specifically, some authors proposed that children with SLI would need more exemplars to abstract a given construction from the input and apply it to new instances (Leroy et al., 2013). In this study, we want to broaden this assumption to the acquisition of words: we evaluated the ability of children with SLI to generalize novel words, and in particular relational words. SLI seem indeed to be linked to an impairment in the processing of relations: children with SLI have poorer performance than their age-matched peers in linguistic or non-linguistic analogical tasks, which require to reason about relational structures (Leroy et al., 2014). We draw the hypothesis that children with SLI would need more exemplars in order to generalize words compared to age-matched but also to language-matched peers. We created a novel word extension task to improve this hypothesis: the first part is composed with nine test trials, each associated with a non-word. The child sees one, two, or three exemplars of a novel noun in short animations. The examiner tells him: “This is a /dyfɑ̃/”. Then, the child sees three other animations and the examiner says: “Show me which one of these is a /dyfɑ̃/”. The child has to choose the object that plays the same role as the exemplars among two distractors: an object that looks like one of the exemplar and a non-related distractor. The second part of the task is based on the same protocol but the exemplars are objects that have a specific spatial configuration (like symmetry). Here again, the child sees one, two, or three exemplars of a novel noun associated with the objects. The examiner tells him: “This is a /fegɑ̃/”. Then, the child sees three other objects and the examiner says: “Show me which one of these is a /fegɑ̃/”. The distractors are an object that has the same global form as one of the exemplar but without having the specific configuration required, and the non-related distractor. The participants are 20 children diagnosed with SLI aged from 6 to 12 years-old. Each child is match to a control child in age and non-verbal IQ on the one hand, and to a control child in linguistic age (based on a measure of vocabulary comprehension). Results show that children are better able to extend relational words when presented with several referents of these words, which confirms what has already been found in other experiments (Gentner, 2005). When the feature to be used is a spatial relation between the parts of the objects, children with SLI have more difficulties than age-matched controls extending new words, which confirms that SLI is linked to an impairment in the processing of relations and a greater dependance on perceptual information (Leroy et al., 2014). They also tend to benefit more than age-matched children from the presentation of several referents of a new word in order to extend it, what would mean that they greatly benefit from comparison and variability in order to identify relational similarities. It would be interesting to see if children can learn from several items that relational feature can be pertinent to define categories and extend words, as young children without SLI can do it with shape while children with SLI cannot (Collinson et al., 2015). [less ▲]

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See detailA novel approach towards manipulation of vortex matter in a superconductor with micromagnetic structures
Shaw, Gorky ULg

Conference (2017, June 01)

Though Superconductor/Ferromagnet hybrids is a widely studied system, application of hard magnetic materials as sources of vortex pinning remains relatively unexplored. They offer a number of advantages ... [more ▼]

Though Superconductor/Ferromagnet hybrids is a widely studied system, application of hard magnetic materials as sources of vortex pinning remains relatively unexplored. They offer a number of advantages over softer magnetic materials, like greater stability and larger magnetic field amplitudes. Recently, a promising technique, thermomagnetic patterning (TMP), has been developed to prepare micromagnets, which serve as micro flux sources to produce magnetic fields spatially modulated at the micron scale. Permanent magnetic structures prepared using TMP present an interesting and so far unexplored option for controlled artificial pinning. We have investigated the vortex matter in superconductor/TMP micromagnet heterostructures (Nb-NdFeB) using quantitative Magneto-Optical Imaging (MOI). Comprehensive protocols have been developed for calibrating and converting Faraday rotation data acquired by MOI to magnetic field maps. These protocols reveal the comparatively weaker magnetic response of the superconductor from the background of larger fields associated with the magnetic layer in its vicinity. Further, TMP micromagnet structures have been imprinted in a permalloy (Py) layer following a protocol reported earlier to obtain flexible magnetic landscapes for flux guidance in a Nb layer below it. Both smooth flux penetration and vortex avalanches in Nb are observed to be strongly influenced by the micromagnetic patterns. Our study offers new insights into the peculiarities of the vortex state in these superconductor-micromagnet heterostructures. [less ▲]

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See detailDe l'errance individuelle à la reconnaissance collective: Récits de patients et de proches impliqués dans des associations de maladies rares en Belgique
Duysens, Fanny ULg

Conference (2017, June 01)

Les maladies dites rares affectent moins d’une personne sur 2000 selon les chiffres de l'Union Européenne. Outre ce faible taux de prévalence, elles sont définies comme faisant généralement l'objet d'une ... [more ▼]

Les maladies dites rares affectent moins d’une personne sur 2000 selon les chiffres de l'Union Européenne. Outre ce faible taux de prévalence, elles sont définies comme faisant généralement l'objet d'une insuffisance de connaissance et de reconnaissance, qui conduit souvent à des situations d'errance diagnostique et thérapeutique pour les patients et leurs proches. Ainsi, ceux-ci sont nombreux à se regrouper dans des associations qui visent à guider quelque peu les personnes concernées dans leurs parcours et à améliorer leur qualité de vie. S'inscrivant dans le champ des sciences sociales, et plus particulièrement des Science & Technology Studies et de l'anthropologie de la santé et de la maladie, cette recherche doctorale (en cours) explore les activités d’associations de patients et de proches formées autour de maladies rares en Belgique. Elle se base sur une ethnographie multi-site qui implique notamment des entretiens biographiques avec des personnes engagées. Ce sont des récits de parcours et d'expériences, dans lesquels les personnes ont raconté les manières dont elles se sont trouvées concernées par certaines maladies, les raisons qui les ont conduit à fonder ou à rejoindre une association, ainsi que les enjeux de cet engagement tant sur les plans individuels que collectifs. L'étude des récits des patients et des proches engagés montre qu'ils constituent en eux-mêmes de véritables ressources mobilisées dans les activités des associations de maladies rares. De fait, celles-ci apparaissent comme des espaces de production et de mise en circulation de certains types de récits qui visent entre autres à caractériser la "rareté" d'une maladie et à construire une catégorie univoque de "maladie rare". Les associations travaillent à identifier des problématiques communes, puis élaborer des missions susceptibles de bénéficier à tous au-delà de la multiplicité des personnes, des situations, des conceptions et des expériences vécues. Dans une approche comparative des récits des parcours et des expériences individuelles de représentants de différentes associations, cette communication visait à étudier le fond et la forme de ces récits en vue de comprendre les logiques de leur mobilisation collective pour une catégorisation de la "maladie rare". Plus particulièrement, il s'agissait d'interroger l'articulation entre la singularité des récits et la certaine logique collective qu'ils reflètent. Comment les expériences sont-elles échangées au sein des associations ? Comment sont-elles alignées les unes par rapport aux autres pour en faire des ressources mobilisables collectivement ? Comment est ainsi construite la catégorie de "maladie rare" ? Quels sont les éléments qui font sens et qu’est-ce qui, à l’inverse, se perd dans ce passage de l’individuel au collectif ? Par ailleurs, quels sont les rapports entre les récits des patients et des proches engagés et les contextes sociaux, politiques et médicaux plus larges dans lesquels ils s'inscrivent ? [less ▲]

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See detailEfficacité de la combinaison des méthodes explicite et implicite pour intervenir sur les difficultés morphosyntaxiques
Houben, Lauren; Maillart, Christelle ULg; Leroy, Sandrine ULg

Poster (2017, June 01)

Pour que la logopédie puisse s’appuyer sur une pratique basée sur les preuves (Evidence-Based Practice), il est nécessaire de disposer d’études traitant de l’efficacité des interventions. Dans la ... [more ▼]

Pour que la logopédie puisse s’appuyer sur une pratique basée sur les preuves (Evidence-Based Practice), il est nécessaire de disposer d’études traitant de l’efficacité des interventions. Dans la littérature scientifique, deux approches sont mises en avant pour pallier aux difficultés morphosyntaxiques: les méthodes implicites opposées aux méthodes explicites. Les méthodes implicites s’avèrent pertinentes chez les enfants d’âge préscolaire, en raison de leurs faibles habiletés métalinguistiques. Ces méthodes réfèrent aux méthodes de facilitation grammaticale (imitation, modelage, stimulation focalisée et reformulation) et à l’approche basée sur l’usage. Cette dernière tient compte de l’apprentissage progressif des différentes structures grammaticales chez les enfants ayant un développement typique (notamment Riches, 2013). Les méthodes explicites offrent un apprentissage explicite du langage. Elles reposent sur le constat selon lequel, en raison d’un déficit de la mémoire procédurale, les enfants ayant des troubles du langage ne parviendraient pas à apprendre implicitement le langage. Actuellement, les résultats obtenus quant à l’efficacité de ces méthodes semblent contradictoires. Dès lors, la combinaison des deux types d’approches pourrait être envisagée. Actuellement, une seule étude (Smith-Lock et al., 2013) s’est intéressée à cette combinaison des deux méthodes et a prouvé son efficacité. Bien que cette étude soit assez prometteuse quant aux bienfaits d’une rééducation s’appuyant sur plusieurs méthodes, des recherches complémentaires sont indispensables. [less ▲]

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See detailQuand l'enfant révèle un abus sexuel : le vécu du couple, ses fonctions et conséquences
Gallo, Alicia ULg; Wertz, Céline ULg; Blavier, Adelaïde ULg

Conference (2017, June 01)

Cet exposé relate les difficultés du couple à l’annonce d’un abus sexuel d’un enfant. Ce vécu mérite d’être investigué car nous savons combien la souffrance des parents influence celle des enfants et peut ... [more ▼]

Cet exposé relate les difficultés du couple à l’annonce d’un abus sexuel d’un enfant. Ce vécu mérite d’être investigué car nous savons combien la souffrance des parents influence celle des enfants et peut alimenter voire maintenir leurs symptômes. Notre échantillon comprend 6 couples dont l’enfant a été victime. Nous avons réalisé un entretien semi-structuré récoltant les informations sur les circonstances de l’abus. De plus, nous avons administré 5 questionnaires évaluant une dimension spécifique du couple. Les résultats obtenus soulignent une détresse chez chaque couple. Cependant, celle-ci s’exprime différemment, aussi bien entre les couples qu’entre les partenaires conjugaux. Néanmoins, pour chacun d’eux, la dimension de la parentalité semble être une ressource permettant un investissement auprès de leur enfant par une focalisation ayant pour conséquence l’effacement du couple conjugal. Si certains couples manifestent néanmoins un rapprochement, celui-ci se fait autour de l’enfant et du problème. Cette capacité à faire équipe nous laisse penser que ces couples disposent de ressources pour faire face à l’abus. L’intérêt porté à la détresse conjugale et parentale semble primordial car si les parents tentent dans un premier temps de mettre en place des mécanismes assurant l’homéostasie et la sécurité, ceux-ci ne sont pas toujours adaptatifs à long terme (secret de famille, surprotection, étiolement du couple). Ainsi, il nous semble impératif de soutenir et contenir la conjugalité. D’autres études sont nécessaires pour approfondir les difficultés vécues par ces couples. [less ▲]

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See detailSuperconducting weak links created by electromigration
Silhanek, Alejandro ULg

Conference (2017, June 01)

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum ... [more ▼]

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum phase slips may takes place when the effective cross section becomes smaller than ~150 nm^2. In the regime dominated by quantum phase slips the nanowire loses completely its capacity to carry current without dissipation, even at the lowest possible temperature. We also discuss the origin of negative magnetoresistance at low magnetic fields in the bow-tie shaped constrictions. Strikingly, the detrimental effect caused by the repeated electromigration can be healed by simply inverting the current direction. These findings reveal perspectives of the proposed fabrication method for exploring various fascinating superconducting phenomena in atomic size constrictions. [less ▲]

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See detailExploration des processus de recollection et de familiarité chez des patients présentant une plainte mnésique : Une étude longitudinale
Simon, Jessica ULg; Collette, Fabienne ULg; Salmon, Eric ULg et al

Poster (2017, June 01)

Les données actuelles suggèrent une altération précoce de la recollection dans les premiers stades de la maladie d’Alzheimer. Par contre, aucun consensus n’a pu être dégagé concernant l’intégrité de la ... [more ▼]

Les données actuelles suggèrent une altération précoce de la recollection dans les premiers stades de la maladie d’Alzheimer. Par contre, aucun consensus n’a pu être dégagé concernant l’intégrité de la familiarité. En effet, certaines études suggèrent une altération précoce de ce processus, alors que d’autres montrent une préservation de celle-ci. Dans ce cadre, nous avons exploré l'impact du type de format de reconnaissance et du matériel sur la recollection et la familiarité chez des patients qui se plaignent de leur mémoire. Nous avons recruté 23 participants âgés contrôles, 9 patients présentant un trouble subjectif de la mémoire (SCI) et 23 patients présentant un trouble cognitif léger (TCL). Les participants ont réalisé une tâche de reconnaissance à choix forcé à deux alternatives et une tâche de reconnaissance Oui-Non incluant des images et des mots. Ces tâches étaient suivies d’une courte évaluation neuropsychologique. Quinze participants âgés contrôles et 23 patients ont participé au suivi, incluant une évaluation neuropsychologique, dans un délai moyen de 21 mois. Nos résultats montrent qu’à l’inclusion, les patients avec TCL avaient des performances moindres en reconnaissance que les deux autres groupes, qui ne différaient pas. De même, ces patients utilisaient moins efficacement la recollection et la familiarité par rapport aux contrôles et aux SCI, qui présentaient des performances similaires. Il n’y avait aucune interaction entre le groupe et le type de format ou le matériel. Lors du suivi, cinq patients avec TCL ont retrouvé un niveau d’efficience cognitive dans la norme et ont été considérés comme des SCI car les plaintes mnésiques étaient toujours présentes. Sur la base de l'adaptation française du test de rappel libre et indicé (RLRI-16), nous avons calculé une pente de déclin mnésique pour chacun de nos patients. Nous avons observé que les indices de recollection et de familiarité étaient expliqués par les pentes de déclin calculées sur le nombre total d’items rappelés librement. Ainsi, nous avons observé un déclin de la recollection et la familiarité dans le groupe de TCL mais pas dans celui des SCI, bien que les deux groupes se plaignent de leur mémoire. En outre, l'efficacité de la familiarité pourrait prédire un déclin cognitif futur. [less ▲]

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See detailThe Delivery of Bad News to Customers in Service Encounters: An Employee Perspective
Delcourt, Cécile ULg; Gremler, Dwayne; Greer, Dominique

Conference (2017, June)

During service encounters, customer contact employees often need to deliver bad news: unexpected information contrary to the customer’s wellbeing. For example, technicians regularly tell customers that ... [more ▼]

During service encounters, customer contact employees often need to deliver bad news: unexpected information contrary to the customer’s wellbeing. For example, technicians regularly tell customers that none of the data on their computer hard drive can be retrieved, veterinarians often inform owners that a beloved pet has cancer and cannot be cured, and airline staff regularly tell travelers that their flights have been cancelled due to bad weather. For some customer-contact employees, delivering bad news is an unavoidable, delicate, and emotionally-charged task that occurs regularly. Disclosing bad news can be highly stressful and perhaps detrimental for (1) customers, (2) customer- contact employees, and (3) service firms in general. Accordingly, it is crucial for service organizations to better understand bad news encounters (i.e., situations during which customer contact employees must deliver negative information) to better equip their managers and employees to deliver such news to customers. The topic of how to best deliver bad news has been broached in various disciplines, including the medical literature (e.g., Baile et al. 2000, 2002; Rosenbaum et al. 2004), the management literature (e.g., Bies 2013; Kothari, Shu, and Wysocki 2009), and the sociology literature (e.g., Clark and LaBeff 1986). These literatures have (1) examined the attitudes and emotions of the discloser of extreme bad news in very specific contexts, (2) identified the tactics used by disclosers, and (3) developed protocols for delivering extremely negative information. Surprisingly, studies of bad news delivered by contact employees are scarce in service research. Service failure and service recovery have received much attention, but this literature has two major gaps when it comes to understanding the delivery of negative information. First, service recovery research generally skips over the initial part of the process where employees first communicate bad news to customers, and instead focuses primarily on the process involved to resolve the situation. Second, there are many situations in which employees must deliver negative information to customers where it is clear that a service failure has not occurred (e.g., informing a customer that his 30-year old dishwasher is beyond repair). We use the critical incident technique (CIT) (Flanagan 1954; Gremler 2004) to analyze 200 incidents where service employees from a wide range of service sectors had to deliver bad news to a customer. [less ▲]

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See detailLeibniz and the Polyp, or the Metaphysical Puzzle of Life
Dony, Arthur ULg

in Scienza e Philosophia (2017, June), 17

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See detailAutomatic phase identification of smart meter measurement data
Olivier, Frédéric ULg; Ernst, Damien ULg; Fonteneau, Raphaël ULg

in Proc. of CIRED 2017 (2017, June)

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we ... [more ▼]

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we propose a novel method for identifying the phases of the measurement devices, based exclusively on voltage measurement correlation. It relies on graph theory and the notion of maximum spanning tree. It has been tested on a real Belgian LV network, first with simulated unbalanced voltage for which it managed to correctly identify the phases of all measurement points, second, on preliminary data from a real measurement campaign for which it shows encouraging results. [less ▲]

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See detailA Model Reduction Approach for Simulation of Long-term Voltage and Frequency Dynamics
Weckesser, Johannes ULg; Franz, Valeri; Grebe, Eckhard et al

in 12th IEEE PES PowerTech Conference 2017 (2017, June)

This paper presents a novel approach, which identifies a buffer zone around a given study system and replaces the external system with an equivalent. The aim is to obtain a reduced system, which is ... [more ▼]

This paper presents a novel approach, which identifies a buffer zone around a given study system and replaces the external system with an equivalent. The aim is to obtain a reduced system, which is suitable for assessment of long-term voltage and frequency dynamics in the study system. First, the proposed methodology ensures that all components, which are impacting the voltage profile of the study system, are included in the buffer zone. For that purpose, the propagation of reactive power changes from the boundary of the study system into the external system are used in a modified depth-first search algorithm to identify the buffer zone. Second, the external system is replaced with equivalents accounting for inertia and primary frequency control effects. The proposed method was successfully tested on a modified version of the ENTSO-E Dynamic Study Model. [less ▲]

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See detailMultimodal imaging analysis in Charles Bonnet Syndrome: a case report
Martial, Charlotte ULg; Di Perri, Carol ULg; Larroque, Stephen ULg et al

Poster (2017, June)

Charles Bonnet syndrome (CBS) is a rare condition characterized by visual impairment associated with complex visual hallucinations in psychologically normal elderly people. Previous studies have suggested ... [more ▼]

Charles Bonnet syndrome (CBS) is a rare condition characterized by visual impairment associated with complex visual hallucinations in psychologically normal elderly people. Previous studies have suggested that visual hallucinations may be caused by brain damage in the visual system. However, in the case of CBS, specific brain regions in the occipital cortex have not been clearly determined and functional neuroimaging remains relatively unexplored. To our knowledge, functional connectivity by means of resting-state magnetic resonance imaging (MRI) has never been investigated in patients with CBS. We here aimed to investigate structural imaging, brain metabolism and functional connectivity in a patient with CBS. Resting-state functional and structural MRI were acquired in an 85-year-old patient with CBS and 12 age- and gender-matched normally sighted controls. Cognitive functioning was measured by behavioral assessment. A seed-based resting state fMRI was performed to investigate the default mode network (DMN), the executive control network and the visual networks connectivity. A voxel-based morphometry (VBM) analysis was employed to investigate the grey matter volume. Cortical and subcortical grey matter thickness were further investigated. Finally, 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) was also acquired to observe regional glucose uptake by comparing standard uptake values (SUVs). Increased functional connectivity was found between the DMN and the temporo-occipital fusiform cortex, as well as between the secondary visual cortex and the left frontal cortex, in the CBS patient compared to controls. The patient also demonstrated increased functional connectivity between the primary visual cortex and the left supramarginal gyrus and between the associative visual cortex and the superior temporal gyrus/angular gyrus, as compared to controls. Decreased grey matter volume was observed in the lateral occipital cortex/angular gyrus in our patient as compared to controls. Diminished grey matter thickness values were observed in the lateral geniculate nucleus compared to healthy controls. FDG-PET results confirmed previous work and showed bilateral hypometabolism in the occipital cortex (mean SUV reduction of 5.36%, p<0.001). Our results suggest that structural alterations in visual system in CBS are associated with compensatory/adaptive changes in functional connectivity that involve regions known to support hallucinations of faces in CBS patients. We suggest that this functional connectivity reorganization following visual structural damage may contribute to visual hallucinations. These findings might shed light on the pathophysiology underlining this rare condition. [less ▲]

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See detailQuantification of roots by the use of NIR hyperspectral imaging and chemometrics
Eylenbosch, Damien ULg; Baeten, Vincent; Bodson, Bernard ULg et al

Poster (2017, June)

Roots, the belowground part of plants, play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for suitable crop production but ... [more ▼]

Roots, the belowground part of plants, play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for suitable crop production but roots are hidden by soil and their study is therefore difficult. Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However, this method is limited due to the time needed to extract roots from soil cores and to manually sort them from crop residues before quantification. To avoid this tedious sorting step and remove operator subjectivity, a faster sorting method was developed. Near infrared hyperspectral imaging (NIR-HIS) was tested as a rapid method to quantify the amount of roots in soil samples. [less ▲]

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See detailUsing electric vehicles as flexible resource in power systems: A case study in the Netherlands
Beltramo, Agnese; Julea, Andreea; Refa, Nazir et al

in Proceedings of the 14th International Conference on the European Energy Market (2017, June)

The European Union (EU) is actively encouraging member countries to phase out traditional oil-fuelled cars in cities in favour of Electric Vehicles (EV) as a solution for increasing efficiency ... [more ▼]

The European Union (EU) is actively encouraging member countries to phase out traditional oil-fuelled cars in cities in favour of Electric Vehicles (EV) as a solution for increasing efficiency, contributing to ensure security of supply, decrease CO2 emission and decrease local (especially urban) air pollution coming from the transport sector. With the increasing associated charging infrastructure deployment all over European countries, the demand coming from these technologies might impact the power system and potentially offer a source of flexibility through variable charging profiles and battery storage capacity options. In the recent years, the Dutch government has adopted several policy support mechanisms for EVs uptake, which made the Netherlands the country with the highest market share of electric cars in 2015 in the EU, and the second-highest share worldwide after Norway. This country is therefore a unique case study for the analysis of EVs charging demand and impact of the power sector. The recent uptake of EVs provides a significant amount of historical data regarding charging profiles, connection times or utilisation patterns pertaining this technology. This paper aims at exploiting such data to evaluate the current and future impact of electric vehicle deployment on the power system. To that end, historical data from 2015 are used in conjunction with the Dispa-SET model, a unit commitment and power dispatch model developed at the Joint Research Centre (JRC) of the European Commission. This aims at investigating the impact of Battery Electric Vehicle (BEV) charging demand on the current Dutch power system, under different hypotheses for BEV technology penetration and renewable energy deployment (i.e. wind and solar) in the country. In addition, looking at the entire connection periods when vehicles are plugged to the grid, the battery capacity connected to the system is estimated, based on commercial BEV battery characteristics. This total capacity is finally used as variable storage unit in the model, in order to investigate the impact that Vehicle to Grid (V2G) strategies could have on the optimal use of power resources available, with particular attention to Variable Renewable Energy (VRE). [less ▲]

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See detail[18F]BPAM121: An AMPAR Modulator with Potential as a PET Probe
Manos-Turvey, Alexandra ULg; Lemaire, Christian ULg; Deverdenne, François et al

Poster (2017, June)

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See detailStaggered strong coupling between existing fluid and solid solvers through a Python interface for fluid-structure interaction problems
Thomas, David ULg; Variyar, Anil; Boman, Romain ULg et al

in Proceedings of the VII International Conference on Coupled Problems in Science and Engineering (2017, June)

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See detailThe Use of Inflammatory Markers in Field Cattle Medicine
Guyot, Hugues ULg

in ACVIM Forum Proceedings (2017, June)

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to ... [more ▼]

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to pathologies (BOH or ions Ca++, Na+, K+, etc.). Beside these interesting elements, inflammation, which is either a cause or a consequence of a specific disease, is often forgotten. This presentation will refresh the practitioner’s knowledge on the assessment of inflammation in cattle by using inflammatory markers assayed with laboratory and cow-side tests. The interpretation of these markers can be sometimes delicate (bias) and might not necessarily lead to a prognosis. Depending on the age of the animal, some inflammatory markers can also serve as diagnosis for other purposes such as the evaluation of passive immunity transfer in calves. [less ▲]

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See detailQuantification of roots by the use of NIR hyperspectral imaging and chemometrics
Eylenbosch, Damien ULg; Baeten, Vincent; Bodson, Bernard ULg et al

Conference (2017, June)

Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However ... [more ▼]

Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However, this method is limited due to the time needed to extract roots from soil cores and to manually sort them from crop residues before quantification. To avoid this tedious sorting step and remove operator subjectivity, a procedure based on NIR Hyperspectral Imaging (NIR-HSI) has been developed. [less ▲]

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See detailImpact of 3’-­‐sialyllactose and Bifidobacterium crudilactis on infant feces microbial composition and virulence modulation of Escherichia coli O157:H7, using the SHIME® gastrointes6nal model
Bondue, Pauline ULg; Lebrun, Sarah ULg; Crevecoeur, Sébastien ULg et al

Poster (2017, June)

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major ... [more ▼]

Bifidobacterium crudilactis, a bacterial species from bovine origin, growths on bovine milk oligosaccharides (BMO). Cell free spent media (CFSM) from B. crudilactis and 3’-sialyllactose (3’SL), a major BMO, modulated Escherichia coli O157:H7 virulence gene expressiona. In this study, the SHIME® gastrointestinal model was inoculated with 4 different treatments: 3’SL (ttm1), B. crudilactis (ttm2), 3’SL and B. crudilactis (ttm3) and CFSM from 3’SL and B. crudilactis culture (ttm4). In each section of the colon, samples were collected and analysed for short chain fatty acid (SCFA) concentration using HPLC, microbial populations using 16S rDNA metagenetic analysis and correlated with E. coli O157:H7 virulence gene expression. The results showed that SCFA levels were stable during the experiments. Metagenetic analysis showed a microbial diversity in transverse (TC) and descending colon (DC) close to feces, dominated by Bacteroides, Prevotella and Fusobacterium, while the ascending colon (AC) showed a different microbial diversity dominated by Veillonella. Ttm4 and ttm2 induced mainly a down-regulation of virulence genes: fliC in DC with ttm4, and luxS, stx1, qseA in AC, DC or TC with ttm2. Ttm1 also showed a down-regulation of fliC in DC, similar to the one observed with ttm4, but this was associated with an up-regulation of fliC and stx1 in AC or TC. Finally, ttm3 showed slight upregulation of ler, fliC and qseA in AC. These results show that ttm4 and ttm2 might have a positive effect against virulence expression of E. coli O157:H7. However, this trend has to be validated with the further replicates on the SHIME® system. [less ▲]

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See detailThe Split-Band Interferometry Approach to Determine the Phase Unwrapping Offset
Libert, Ludivine ULg; De Rauw, Dominique ULg; d'Oreye, Nicolas et al

Poster (2017, June)

This poster presents an approach based on the Split-Band Interferometry to solve the ambiguities introduced during the phase unwrapping of separate regions.

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See detailExperimental design helps to optimize spray drying processes
Dellicour, Aline ULg; Cloots, Rudi ULg; Boschini, Frédéric ULg

Poster (2017, June)

Experimental design is necessary to identify major experimental parameters linked to a process in order to optimize it and reduce costs. It also helps to reduce the number of experiments and analyze data ... [more ▼]

Experimental design is necessary to identify major experimental parameters linked to a process in order to optimize it and reduce costs. It also helps to reduce the number of experiments and analyze data statistically. This work aims to present some possibilities of how experimental design may be applied in the field of pharmaceutical powders production by spray drying. Depending on the application, powders need particular size, morphology, purity, crystallinity or polymorphism. All these characteristics may be influenced by process parameters and should be controlled to reach pharmaceutical requirements. [less ▲]

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See detailA strategy to protect reference sites for future microbiology research in Antarctica
Wilmotte, Annick ULg; Willems, Anne; Verleyen, Elie et al

in Van de Putte, Anton (Ed.) Book of abstracts: XIIth SCAR Biology Symposium, Leuven, Belgium, 10-14 July 2017. (2017, June)

In addition to iconic animals and birds, Antarctica harbours surprisingly diverse microbial communities that drive important biogeochemical processes in virtually all habitats, including ice-free regions ... [more ▼]

In addition to iconic animals and birds, Antarctica harbours surprisingly diverse microbial communities that drive important biogeochemical processes in virtually all habitats, including ice-free regions, ice sheets and subglacial habitats. Recent studies have shown that Antarctic microbiomes may have unique compositions and functions, exhibit biogeographic patterns, and include endemic taxa that have survived in refugia since the continent started to glaciate. Microbial habitats are under constant pressure due to anthropogenic activities, which may introduce non-indigenous microorganisms, via human bodies, clothing, food, cargo, or construction material. New ‘entry points‘ for microbial contamination are a consequence of the increase and diversification of tourism and research stations. Climatic changes might increase the probability of establishment of non-native taxa. The impacts of such introductions are still unknown, but might lead to a loss of the native microbial biodiversity, or its modification. The technical progress in molecular methodologies has generated very sensitive high-throughput methods. They have the potential to describe the microbial communities with unprecedented detail. However, due to the anthropogenic pressure described above, we may be losing the pristine Antarctic areas that would enable scientists to study the native microbial flora, its functions and properties. One tool of the Protocol on Environmental Protection of the Antarctic Treaty that could be specifically used to protect microbial habitats is the creation of inviolate areas where a special entry permit is required (inside ASPAs, for example) and quarantine equipment needs to be used. These zones could be set aside for future research and become extremely valuable as after a few decades, they would be unique examples of pristine habitats, representative of the native microbial diversity and processes. [less ▲]

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See detailVoltage Profile Correction in Distribution Grids Combining Single- and Two-level Controllers
Soleimani Bidgoli, Hamid ULg; Van Cutsem, Thierry ULg

in IEEE PES 2017 PowerTech conference proceedings (2017, June)

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two ... [more ▼]

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two levels: locally, in DGU controllers, and centrally by a supervisory controller acting on some of the DGUs only. The centralized, discrete controller solves a multi-time-step constrained optimization inspired of Model Predictive Control. Unacceptable voltage deviations are partially but rapidly corrected by the local controls. Further but slower corrections are applied by the upper level, taking advantage of the coordination between DGUs. This hybrid control is of practical interest where the deployment of the upper level control is not feasible or affordable over all DGUs. The proposed method effectiveness is demonstrated on a 75-bus test system. [less ▲]

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See detailUnravelling the secret of the resistance of desert strains of Chroococcidiopsis to desiccation and radiation
Billi, Daniela; Fagliarone; Verseux, Cyprien et al

in Van de Putte, Anton (Ed.) Book of abstracts: XIIth SCAR Biology Symposium, Leuven, Belgium, 10-14 July 2017. (2017, June)

Chroococcidiopsis is a unicellular cyanobacterial genus that is growing in extreme dry conditions, either in low or high temperatures. At the lower end of the spectrum, they live as cryptoendoliths in ... [more ▼]

Chroococcidiopsis is a unicellular cyanobacterial genus that is growing in extreme dry conditions, either in low or high temperatures. At the lower end of the spectrum, they live as cryptoendoliths in rocks of the Mc Murdo Dry Valleys in Antarctica where they were discovered by Imre Friedmann, while at the higher end, they grow as hypoliths/endoliths in hot deserts, e.g. Negev, Gobi, Atacama. The capacity of desert strains of Chroococcidiopsis to stabilize their sub-cellular organization is so efficient that, when dried, they can cope with simulated space and Martian conditionsas well as with high doses of ionizing and UV radiations . [less ▲]

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Peer Reviewed
See detailMindfulness in Cyber-Security: The Case of a Government Agency
Tapanainen, Tommi ULg; Lisein, Olivier ULg

Conference (2017, June)

Cyber-security requires not only technical preparations but also organizational practices that reduce the likelihood and severity of damage to the organization. Although user compliance to security ... [more ▼]

Cyber-security requires not only technical preparations but also organizational practices that reduce the likelihood and severity of damage to the organization. Although user compliance to security policies has been examined in prior literature, user behaviour is only one facet of an organization’s cyber-security; the actions of the IT staff, crisis team, and the management are just as critical. Consequently, organizational practices in cyber-security are not understood very well. To address this gap, this research applied the concept of mindfulness, which has recently received attention also in the IT field. We collected data from a revelatory case – that of a government agency that was targeted by a large-scale cyber-attack – and applied the concept of mindfulness in analyzing the data. Our analysis uncovered a number of mindful practices related to cyber-security. These practices can serve as a building block to theorize on the activities to be taken by IT workers in promoting cyber-security. Our paper also suggests avenues for further research in the emerging topic, for instance, through the concept of cyber-security capability. [less ▲]

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See detailQuantification of serum androstanediol glucuronide
LE GOFF, Caroline ULg

in Clinical Chemistry and Laboratory Medicine (2017, June)

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