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See detailDimensions adaptatives des fonctionnements pervers et psychopathiques : une approche étho-phénoménologique
Englebert, Jérôme ULg

Conference (2017, July 10)

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique ... [more ▼]

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique clinique suggère de conserver ces deux entités présentant une finesse psychopathologique plus grande et un pouvoir discriminatif plus important que la personnalité antisociale. Nous souhaitons interroger les dimensions intrinsèquement adaptatives de ces deux entités, mais aussi relever leurs différences sur le continuum de l’adaptation. Nous chercherons, en effet, à démontrer que le principe d'adaptation est une dimension centrale et commune aux deux entités, mais qui « se joue » de façons différentes pour chacune. Le pervers est hyper-adapté à son interlocuteur tout en présentant des moments paradoxaux d'inadaptation. Le psychopathe, avec sa faculté de chosification de l'alter ego et ses compétences émotionnelles paradoxales, présente une adaptation plus solitaire. Dans une perspective inspirée des paradigmes éthologique et phénoménologique, nous tenterons de cerner les différences essentielles entre ces deux modes d’être-au-monde. [less ▲]

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See detailcopycat: Testing Differential Treatment of New Transport Protocols in the Wild
Edeline, Korian ULg; Kühlewind, Mirja; Trammell, Brian et al

in Applied Networking Research Workshop (2017, July)

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches ... [more ▼]

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches, such as PLUS and Google's QUIC, introduce an upper transport layer atop UDP; their deployment therefore relies on UDP not being disadvantaged with respect to TCP by the Internet. This paper introduces copycat, a generic transport protocol testing tool that highlights differential treatment by the path in terms of connectivity and QoS between TCP and a non-TCP transport protocol. copycat generates TCP-shaped traffic with custom headers, and compares its performance in terms of loss and delay with TCP. We present a proof-of-concept case study (UDP vs. TCP) in order to answer questions about the deployability of current transport evolution approaches, and demonstrate the extent of copycat's capabilities and possible applications. While the vast majority of UDP impairments are found to be access-network linked, and subtle impairment is rare, middleboxes might adapt to new protocols that would then perform differently in the wild compared to early deployments or controlled environment testing. [less ▲]

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See detailStable isotopes reveal effects of environmental changes on ecological niches of Iphimediidae amphipods
Michel, Loïc ULg; d'Udekem d'Acoz, Cédric; Frederich, Bruno ULg et al

Poster (2017, July)

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic ... [more ▼]

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic invertebrates. Here, we focused on Iphimediidae amphipods, as this widely distributed family shows important ecological diversity. In total, 248 amphipods (19 species) from two widely different zones (the West Antarctic Peninsula, or WAP, and Adélie Land, AL) were studied to elucidate how environment can influence ecological niche parameters. Ecological niches were explored using stable isotope ratios of carbon and nitrogen and the SIBER approach (Jackson et al., 2011). The isotopic niche of the whole amphipod assemblage was wider in WAP than in AL. This was true for both total (proxy of the whole range of resources exploited by animals) and the core (proxy of the most commonly used resources) isotopic niches. The ratio between total and core isotopic niches was smaller in WAP than in AL (4.13 vs. 5.74), suggesting that in WAP, animals commonly use a greater relative percentage of the resources to which they have access. Niche modelling at the specific level revealed that this trend was not found in all taxa. For example, niches of Gnathiphimedia sexdentata and Iphimediella microdentata were bigger in WAP than in AL, following the general pattern. On the other hand, niches of Echiniphimedia echinata and E. hodgsoni had the same width in both areas. Moreover, relative niche overlap between these two species was much higher in WAP (42%) than in AL (20%). Our results indicate that the widely different environmental conditions encountered by the animals in these two zones clearly influence their ecology. Overall, Iphimediidae amphipods tend to exploit more resources in WAP, i.e. in the zone where impacts of global change (temperature increase, sea ice cover decrease) are the strongest. Niche overlap between some closely related (i.e. congeneric) species was also more important in WAP. Ultimately, environmental changes in this region might reinforce these trends, which might lead to competition and perturb amphipod community structure. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO and RECTO projects. [less ▲]

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See detailOptimising workforce and energy costs by exploiting production flexibility
Cuvelier, Thibaut ULg; Louveaux, Quentin ULg

Conference (2017, July)

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro ... [more ▼]

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro-intensive. Nevertheless, the plants can significantly reduce this impact: some electro-intensive factories could shift their production to time periods where the electricity is cheaper, resulting in large savings. At the same time, the grid operator can remunerate this consumption adaptation as a flexibility service. Our research goal is to optimise the operations of a factory around this flexibility. We compute a production plan that adapts to price forecasts, but also flexibility levers that adjust this plan to react to unexpected price changes. We propose the unifying concept of reservoir to provide sufficiently good models for the plant's processes. Nevertheless, this methodology implies to have frequent production plan changes, which directly impacts the workers, as they may be asked to follow barely predictable schedules. This has a significant detrimental effect on their quality of life. As a consequence, the human aspect of flexibility must also be considered: we seek for production plans that consider both workforce and energy costs, and we then assign workers to work shifts while ensuring their well-being. This HR orientation is the most innovative contribution of this research project. [less ▲]

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See detailThe grammaticalization of Russian taxonomic nouns
Kolyaseva, Alena ULg

Conference (2017, July)

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See detailReinforcement Learning for Electric Power System Decision and Control: Past Considerations and Perspectives
Glavic, Mevludin ULg; Fonteneau, Raphaël ULg; Ernst, Damien ULg

in The 20th World Congress of the International Federation of Automatic Control, Toulouse 9-14 July 2017 (2017, July)

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are ... [more ▼]

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are reviewed in terms of speci c electric power system problems, type of control and RL method used. We also provide observations about past considerations based on a comprehensive review of available publications. The review reveals the RL is considered as viable solutions to many decision and control problems across di erent time scales and electric power system states. Furthermore, we analyse the perspectives of RL approaches in light of the emergence of new-generation, communications, and instrumentation technologies currently in use, or available for future use, in power systems. The perspectives are also analysed in terms of recent breakthroughs in RL algorithms (Safe RL, Deep RL and path integral control for RL) and other, not previously considered, problems for RL considerations (most notably restorative, emergency controls together with so-called system integrity protection schemes, fusion with existing robust controls, and combining preventive and emergency control). [less ▲]

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See detailWEATHERING ON THE DEVONIAN SLATES AND CHARACTERIZATION OF A BENTONITE LAYER IN THE WESTERWALD (GERMANY)
Fontaine, François ULg; Hamaekers, Helen; Hoffmann, Andreas et al

Conference (2017, July)

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

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian rocks. During the Miocene, intense volcanic activities led to a large basalt cover, protecting the clays from the erosion. The two main goals of this study are first to improve the knowledge on the weathering processes of the Devonian slates that led to the current setting of those clay deposits by studying the mineralogical and chemical composition of the clays with depth. The second goal is to characterize a bentonite layer underneath the Miocene basalt cover using quantitative X-ray diffraction, chemical analysis, BET, cation exchange capacity and scanning electron microscope. A 20 meter deep quarry mining the Devonian bedrock in southern Westerwald has been sampled on its entire depth. The XRD results show no significant variations of the mineralogy with depth, except for the phyllosilicates. The minerals of the < 2 μm fraction are illite, kaolinite, smectite and mixed-layers minerals (vermiculite-chlorite and illite-chlorite). The proportions of the minerals in the mixed-layers chlorite-vermiculite vary with depth. At the bottom of the quarry, the proportion of vermiculite is very low while in the top, the proportion of vermiculite is higher. This is explained by the degree of the weathering, logically more intense at the top of the quarry. Trace elements compositions are currently being investigated. A 3 meter thick greenish to brownish bentonite layer has been found in the eastern part of the Westerwald region. The XRD performed on different samples of this bentonite shows a relatively heterogeneous composition: montmorillonite (60-80%), kaolinite (5-12%), illite (0-7%), goethite (2-15%), talc (0-10%), K-feldspars (0-7%), plagioclase (0-4%) and traces of amphibole and pyroxene. This bentonite is probably the result of the weathering of volcanic ashes. Since there are not many outcrops of this bentonite layer, its spatial distribution is studied by drilling. [less ▲]

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See detailFreeplay-induced limit cycle oscillation mitigation using linear and nonlinear tuned vibration absorbers
Verstraelen, Edouard ULg; Kerschen, Gaëtan ULg; Dimitriadis, Grigorios ULg

in Proceeding of the IFASD 2017 Conference (2017, July)

Structural nonlinearities such as freeplay in control surface bearings and actuators or in connections between wings and external payloads sometimes lead to aeroelastic limit cycle oscillations at ... [more ▼]

Structural nonlinearities such as freeplay in control surface bearings and actuators or in connections between wings and external payloads sometimes lead to aeroelastic limit cycle oscillations at airspeeds lower than the linear flutter speed of the aircraft. In parallel, numerous studies demonstrated the potential of linear and nonlinear tuned vibration absorbers to increase the flutter speed of linear and continuously hardening aeroelastic systems such as two-degree- of-freedom wings or long span bridges. In this work, the effect of linear and nonlinear tuned vibration absorbers is studied on a wing with pitch plunge and control surface deflection degrees of freedom and with freeplay in pitch. Depending on the tuning of the linear absorber, the linear flutter speed of the system can be increased by 10% or the onset of limit cycle oscillations due to the freeplay can be delayed by 7.7% and their amplitude can be significantly decreased. The addition of cubic hardening forces on the absorber can further decrease the limit cycle amplitude in a limited airspeed range at the cost of an increase in limit cycle amplitude in another airspeed range. Conversely, the addition of a freeplay hardening force on the absorber can decrease the limit cycle amplitude without any detrimental effect. [less ▲]

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See detailThe role of Gender, Race, and Class in Transnational Political Movements: Mexican and Colombian Women Engaging in Homeland Politics from Europe’s Capital
Lara-Guerrero, Larisa; Vivas Romero, Maria ULg

Conference (2017, June 30)

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has ... [more ▼]

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has triggered the political and social mobilization of Mexican and Colombian migrants from abroad many of them from the Global City of Brussels. This paper unpacks the motivations and dynamics behind transnational political activism organized by Mexican and Colombian women living in Brussels. By integrating and revising insights from social movements theories, political transnationalism from migration studies and intersectionality studies, this paper elaborates on the role of migrant women organizing and sustaining transnational political movements to change the political conditions of their countries of origin. The ethnographic evidence presented in this paper reveals the importance to recognize the individual level in the analysis of transnational movements. Women are cognitive actors with political ideals and emotions whose political activism is highly influenced by social categorizations such as gender, race, class, and generation. [less ▲]

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See detailMean and variance of Dynamic Functional Connectivity in Parkinson’s Disease
Baquero Duarte, Katherine Andrea ULg; Guldenmund, Pieter; Rouillard, Maud ULg et al

Poster (2017, June 29)

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See detailThe art to talk on immigration: a state of emergency
Da Silva, Amanda Carolina ULg

Conference (2017, June 29)

This paper intend to present the results of the state of emergency project. The project started in 2014 with a simple question: how researchers that work in immigration can communicate with civil society ... [more ▼]

This paper intend to present the results of the state of emergency project. The project started in 2014 with a simple question: how researchers that work in immigration can communicate with civil society outside the traditional academic channels? It is not only a matter of popularization of academic research, but mainly brings researchers into society, far from the academic walls. The answer to this question was the art and the spaces of culture. Art, and also cultural spaces have enormous potential, its could bring together different social groups and help researchers to be in society, and making their research accessible. In the society, debates on immigration are mostly dominated by media and political representations, what is also polarizing societies between solidarity and anti-immigration movement's. Therefore, the presence of researchers to discuss the immigration issue in society has become urgent. The state of emergency project had as a bases my research, “The borders of Nord-Pas-deCalais” (2014), and brought together two dancers, two acrobats, a scene director and a plastic artist. The project started from the assumption that art is a collective production, but artistic intention started with the individual consciousness on the issue the artist is focusing. It was adopted the artistic improvisation method to develop a spectacle and other tolls. In order to incorporate research on immigration into artistic production it was necessary to present and to appropriate the artists of basic concepts, but also carry out a fieldwork, that was developed during a month at the French border (Calais city). The methodology adopted by the artists consisted in a fieldwork. The project took two years to be concluded. The result was a dance spectacle, “Dites a ma mère que je suis la”, and a hybrid form of workshop that mixes the artistic and the methods of immigration research. I contrast, I developed during the project a multi-sited ethnography whit the artists. Where the main objective was to understand which impact the scientific knowledge on the issue could produce in artist's way to see immigration, and how this new approach could change the researcher and artist productions. [less ▲]

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See detailCo-producing sociotechnical solutions in difficult times: the art of governing nuclear wastes in France
Parotte, Céline ULg; Delvenne, Pierre ULg

Conference (2017, June 29)

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object ... [more ▼]

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object with a half-life of more than 100.000 years? This paper’s starting point is the so-called “participatory turn” in the nuclear waste management (NWM) in France, when tensions appeared concerning claims of epistemic authority of national nuclear agencies. In 1990, in the aftermath of violent contestations and citizen mobilization in four Departments, the then Prime Minister of France, Michel Rocard, decided to impose a one-year moratorium on the research conducted by the national nuclear waste management organization (ANDRA). A not so well-known parliamentary technology assessment (PTA) institution, OPECST (the French Office Parlementaire d’Evaluation des Choix Scientifiques et Technologiques), was called to the rescue to clear up a difficult situation and to restore trust between state and scientific agencies and a critical population. We find that OPECST played a surprisingly central role in defining the French NWM program. [less ▲]

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See detail"Exploring Experiences of Inequality in European Urban Centers: Towards an Intersectional and Transnational Approach."
Vivas Romero, Maria ULg; Ramos, Cristina

Conference (2017, June 28)

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in ... [more ▼]

What strategies do migrants living in European cities use to challenge inequalities in access to healthcare, participation in the labor market and the creation of social support networks? The papers in this panel aim to respond to this question by drawing from transnational and intersectional approaches conceptualizing inequalities as sets of relationships between people and broader structures in which interactions generate better opportunity for some more than for others (Tilly, 2000). Panel participants consider that these interactions and the benefits that can be obtained through migration are affected by various social categories such as gender, class, sexual identity, transnational connections, and citizenship. Intersectional approaches allow to examine how these axes of inequality (Crenshaw, 1989; Anthias, 2001) simultaneously affect migration outcomes and also how they operate differently according to the geographical space in which they develop: origin and host societies as well as transnationally. Nonetheless, the papers presented in this panel will also emphasize migrants’ agency to resist or conform to the inequalities they face. Overall, this panel aims to contribute to the study of migration and inequality at the conceptual and methodological levels. At the theoretical level, the panel will build on new debates on the reproduction of intersectional inequalities in transnational settings (Faist, 2016, Amelina, 2017). At the methodological level, all paper presenters have use multi-sited ethnographic methods (working in cities such as Madrid, London, Milan, Brussels and Frankfurt) and will therefore use the panel as an opportunity to discuss the strengths and weaknesses of such method. [less ▲]

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See detailLa comparaison en Belgique
Delville, Michel ULg

Conference (2017, June 22)

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See detailUHPLC-ESI-MS/MS quantitation of natural estrogens in aqueous matrices as pyridine-3-sulfonyl derivatives
Glineur, Alex ULg; Ronkart, Sébastien; Nott, Kathérine et al

Conference (2017, June 22)

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic ... [more ▼]

Natural estrogens (estrone: E1, 17-β-estradiol : E2, estriol : E3) and synthetic estrogen (17-α-ethinylestradiol: EE2) are powerful endocrine disruptors. They may have deleterious effects on aquatic wildlife and also humans even at extremely low concentrations. For this reason, these molecules have been included in a watch list from the European Commission regarding emerging aquatic pollutants. The maximum detection limits are set at 0.035 and 0.40 ng/L for EE2 and E1, E2 respectively. Reaching such low levels of concentration of estrogenic compounds is a challenge, even using state-of-the-art analytical methods. In this study, we developed a UHPLC-ESI-MS/MS method allowing the quantification of E1, E2, E3 and EE2 residues in aqueous matrices. Studies commonly used ESI in negative mode albeit the poor ionization efficiency of native estrogenic compounds in this mode. In this study, the molecules were derivatised using a sulfonyl chloride reagent (pyridine-3-sulfonyl, P-3-S). The resulting response in the positive mode was significantly enhanced. Similarly to other dansyl derivatives, the product ion spectra of the P-3-S derivatives indicate ions originating from the derivatization reagent moiety. Moreover, several other ions were included in the product ion spectra of the P-3-S derivatives. Their specificity was assessed by a qualitative approach implying the analysis of different types of water samples (groundwater, surface water). Some product ions were found to be noticeably better for quantification and confirmation of the analytes. The developed analytical method was validated according to the NF T90-210 norm which is suitable to assess the performances of a method in the water quality field. The limits of quantification were 0.04, 0.05, 0.10 and 0.02 ng/L in groundwater and 0.89, 0.79,4.42 and 0.29 ng/L in surface water for E1, E2, E3 and EE2 respectively. [less ▲]

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See detailSeasonal Transport in Mars’ Mesosphere revealed by Nitric Oxide Nightglow
Stiepen, Arnaud ULg

Conference (2017, June 21)

We analyze the ultraviolet nightglow in the atmosphere of Mars through Nitric Oxide (NO) δ and γ bands emissions. On the dayside thermosphere of Mars, solar extreme ultraviolet radiation partly ... [more ▼]

We analyze the ultraviolet nightglow in the atmosphere of Mars through Nitric Oxide (NO) δ and γ bands emissions. On the dayside thermosphere of Mars, solar extreme ultraviolet radiation partly dissociates CO2 and N2 molecules. O(3P) and N(4S) atoms are carried by the day-to-night hemispheric transport. They preferentially descend in the nightside mesosphere in the winter hemisphere, where they can radiatively recombine to form NO(C2Π). The excited molecules promptly relax by emitting photons in the UV δ bands and in the γ bands through cascades via the A2Σ, v’ = 0 state. These emissions are thus indicators of the N and O atom fluxes transported from the dayside to Mars’ nightside and the winter descending circulation pattern from the nightside thermosphere to the mesosphere (e.g. Bertaux et al., 2005 ; Bougher et al., 1990 ; Cox et al., 2008 ; Gagné et al., 2013 ; Gérard et al., 2008 ; Stiepen et al., 2015, 2017). Observations of these emissions have been accumulated on a large dataset of nightside disk images and vertical profiles obtained at the limb by the Imaging Ultraviolet Spectrograph (IUVS, McClintock et al., 2015) instrument when the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft is at its apoapsis and its periapsis phases along its orbit, respectively. We present discussion on the variability in the brightness and altitude and of the emission with season, geographical position and local time and possible interpretation for local and global changes in the mesosphere dynamics. IUVS images and limb scans reveal unexpected complex structure of the emission. The brightest emission is observed close to the winter pole. The emission is also surprisingly more intense in some longitude, revealing possible impact of tides and waves in Mars’ nightside mesosphere. Observations also reveal spots and streaks, indicating irregularities in the wind circulation pattern. The disk images and limb profiles are compared to the LMD-MGCM model (Gonzàlez-Galindo et al., 2009 ; Lopez-Valverde et al., 2011) to focus on the seasonal, local time and geographical influences on the NO Nightglow emission. We will also provide a statistical study of the regions of enhanced brightness (i.e. splotches and streaks) and discuss possible interpretation from the comparison to the GCM. [less ▲]

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See detailDiametral dimension(s) and prominent bounded sets
Demeulenaere, Loïc ULg

Conference (2017, June 20)

The classical diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz), denoted by "Delta", is a topological invariant which can be used to characterize Schwartz and nuclear locally convex spaces ... [more ▼]

The classical diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz), denoted by "Delta", is a topological invariant which can be used to characterize Schwartz and nuclear locally convex spaces. Mityagin also introduced a variant of this diametral dimension, denoted by "Delta_b", using bounded sets in its definition, contrary to "Delta". In this talk, we present some conditions assuring the equality of these two diametral dimensions for Fréchet spaces. Among these conditions, there is the notion of existence of prominent bounded sets, due to Terzioglu. In fact, it appears that the existence of prominent sets is implied by the property "Omega Bar" of Vogt and Wagner. Finally, we describe a construction which gives Schwartz and nuclear non-Fréchet spaces E verifying "Delta_b(E) = \Delta(E)". [less ▲]

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

Conference (2017, June 19)

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 detailChromatographic analysis of alkaloids in Aconitum pollen : towards new insights in plant protection mechanisms
Vanderplanck, Maryse ULg; Glauser, Gaëtan; Tyteca, Eva ULg et al

Conference (2017, June 19)

Alkaloids are a class of naturally occurring organic nitrogen-containing bases that are found primarily in plants. They display a huge diversity with more than 3,000 different types already identified ... [more ▼]

Alkaloids are a class of naturally occurring organic nitrogen-containing bases that are found primarily in plants. They display a huge diversity with more than 3,000 different types already identified. Next to their different pharmacological and therapeutic effects, alkaloids can have a deleterious impact on organisms as they are known to be neurotoxic and cardiotoxic for mammals and insects. In the current context of worldwide bee decline, occurrence of such compounds in floral production, i.e. nectar and pollen, raises major concerns. They could be beneficial to bees by protecting them against disease and pathogens but they could also cause toxicity. Until now alkaloids, and their effect on human health, are mainly studied in vegetative parts of plants. More recently the natural occurrence of alkaloids in nectar was also studied to investigate their effect on bee health. Whereas nectar chemicals can relatively easily and quickly be analyzed by chromatography, extracting chemicals from low pollen amount remains a challenge because of pollen structure and complexity. However, characterization of pollen chemicals can lead to valuable insight in their impact on pollinators allowing the development of mitigation strategies. In this study, we used a UHPLC-(ESI)-Q-ToF/MS method allowing the identification and quantification of alkaloids in pollen matrices from four Aconitum species; A. lycoctonum, A. napellus compactum, A. napellus neomontanum and A. variegatum. Alkaloid extraction was performed using bead-beating disruption of the pollen sample and chromatographic analysis was carried out on an Acquity UPLC system interfaced with a Synapt G2 QTOF. The separation was achieved in gradient mode on an Acquity UPLC BEH C18 column and detection was performed in electrospray positive ionization mode (ES+). Alkaloid concentrations were measured as aconitine equivalents by using a pure aconitine standard as reference compound. The total amount of alkaloids in Aconitum pollen ranged from 0.75 to 1.20 mg/g with 859 different compounds detected, some of them being pollen-specific. Statistical analyses were conducted on the global dataset to assess both quantitative and qualitative interspecific differences. One-way analysis of variance was performed on the total alkaloid content while a permutational test of multivatiate analysis of variance was used to compare the alkaloid profiles among the four Aconitum species. Results are briefly discussed in an ecological context. [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 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 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 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 detailLa révolution du roman-feuilleton
Durand, Pascal ULg

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

Conference (2017, June 13)

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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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 pratiques sexuelles et des conduites à risques et de 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 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 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 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 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 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 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 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 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 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 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 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 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 detailTree Ensemble Methods and Parcelling to Identify Brain Areas Related to Alzheimer’s Disease
Wehenkel, Marie ULg; Bastin, Christine ULg; Phillips, Christophe ULg et al

in 2017 International Workshop on Pattern Recognition in Neuroimaging (PRNI), proceedings (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 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 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 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 detailIntermodal transport: does a wider definition improve its competitiveness?
Mostert, Martine ULg; Limbourg, Sabine ULg; Caris, An

Conference (2017, June)

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it ... [more ▼]

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves (United Nations, 2001) is identified by the European Commission (2011) as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or IWW. The combination of these modes allows reducing the negative externalities of the whole travel, i.e. the negative impacts that are generated by transport operators, but which are not directly supported by them. These externalities in particular consist in air pollution and climate change, provoked by the release of emissions which lead to air pollution and human health problems. The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The research is based on tools of the operations research domain and proposes the development of an allocation model for freight transport at the strategic level of decision. The goal is to determine the flow distribution of goods between direct transportation by road, rail or inland waterways, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. [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 detailDevelopment of a unified model for flow-material interaction applied to porous charring ablators
Coheur, Joffrey ULg; Schrooyen, Pierre; Turchi, Alessandro et al

Conference (2017, June)

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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 detailE-CLOUD, the open microgrid in existing network infrastructure
Vangulick, David ULg; Cornélusse, Bertrand ULg; Vanherck, Thierry et al

in Proceedings of the 24th International Conference on Electricity Distribution (2017, June)

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in ... [more ▼]

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in the E-cloud and given some local restrictions (e.g. wind turbines cannot be put everywhere), an optimal mix of green generation sources (in kW) and local storage (in kWh) needs to be computed. Then according to this computation, the required generating units and storage device are installed. A repartition mechanism grants the customer a share of the generated electricity and storage capacity. These shares are either computed offline, or dynamically adapted on line. The project will test two models: either the DSO or a producer owns and operates the storage device. Two flows of information (real-time for operation of the storage facility and ex-post for its settlement) are needed to correctly manage the E-Cloud and to ensure correct information exchange with the wholesale market. These information flows are completed thanks to a forecast that provides members of the E-Cloud the full capability to anticipate and obtain the maximum benefits of the local generation. The expected benefits for the customer are a reduction of their electricity bill by a minimum of 10%. Societal benefits should also arise: 1) easing the technical integration of renewables’ generation embedded in the distribution network, and 2) avoids extra investment on the DSO network. The E-Cloud may also ensure new revenue for the DSO thanks to new services provided to the E-Cloud community. [less ▲]

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See detailDocumenting the parameters of effective SoTL counselling
Jérôme, Françoise ULg; Verpoorten, Dominique ULg; Detroz, Pascal ULg

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference (2017, June)

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training ... [more ▼]

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training programme gives participants the opportunity to make a full-scale SoTL study (from the implementation of a well-circumscribed course regulation to the assessment of its pedagogical effectiveness by means of the analysis of collected data) of one prominent aspect of their teaching practice. The process of trying out some new pedagogical approach and of discussing its effects on student learning has also to be reported in the form of a scientific paper (including a short review of the relevant pedagogical literature) and presented to a small audience of teacher colleagues. In order to meet the many requirements of such a complex task, each participant benefits from individualized pedagogical counselling. Besides a brief description of the Formasup context, the present contribution proposes brief case studies of three SoTL projects carried out in 2016. The case studies focus mainly on the dynamics of the interaction between teacher and pedagogical counsellor at each constitutive step of the SoTL project with the intention of making out the specificities of counselling applied to first time SoTL experience (time dedicated to and types of counselling activities in relation to the particularities of individual projects). The case studies are then integrated into a bigger picture drawing upon a larger number of counselling experiences over the last four years (from 2013 to 2016). On the basis of the main characteristics of 21 counselling experiences we propose a typology of teacher profiles according to their strategic approach to SoTL and the corresponding input of counselling. [less ▲]

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See detailEfficient management of a connected microgrid in Belgium
Cornélusse, Bertrand ULg; Ernst, Damien ULg; Warichet, Luc et al

in Proceedings of the 24th International Conference on Electricity Distribution, Glasgow, 12-15 June 2017 (2017, June)

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See detailDecoding the disciplines – A pilot study at the University of Liège (Belgium)
Verpoorten, Dominique ULg; Devyver, Julie ULg; Duchâteau, Dominique ULg et al

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference - Transforming patterns through the scholarship of teaching and learning (2017, June)

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered ... [more ▼]

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered to reflect, through a structured process, upon “bottlenecks” in their courses, with the help of IFRES’ (Institute for Training and Research in Higher Education) pedagogical advisers. This pilot delivered contrasted observations: while participants granted value to their exposure to this approach, especially in terms of enhanced awareness of possible discrepancies between what experts and newcomers in the field might consider as obvious, none of them activated the possibility offered to tackle the identified bottlenecks, according to the systematic approach (stages 3-7) suggested by the framework. The paper presents the pedagogical setting, analyses the interviews of participants and the outcomes of the project, outlines explanations for its results, and shares some lessons learnt. [less ▲]

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See detailHic Sunt NATs: Uncovering Address Translation with a Smart Traceroute
Zullo, Raffaele; Pescapé, Antonio; Edeline, Korian ULg et al

in IEEE/IFIP Workshop on Mobile Network Measurement (MNM) (2017, June)

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope ... [more ▼]

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope with the lack of IPv4 addresses. Recently the landscape for NATs has become even more crowded, especially in mobile networks, mainly due to the impossibility of IPv6 to be a large-scale solution to addressing issues. In this paper, we present a novel methodology for detecting NATs embodied in Mobile Tracebox, a measurement tool for Android smart devices that detects a wide range of middleboxes. It analyzes ICMP time-exceeded messages received during \traceroute and points at IP and transport checksum inconsistencies in the embedded packets to uncover address translation along a path. We deployed Mobile Tracebox through a crowdsourcing approach and used the collected dataset to validate our methodology. Results showed that, in absence of middleboxes breaking \traceroute, it can help to detect and locate NATs in the majority of the cases. [less ▲]

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See detailChallenges of Trace Mineral Diagnosis
Guyot, Hugues ULg

in ACVIM Forum Proceedings (2017, June)

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation ... [more ▼]

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation, depletion of soil and roughages quality. The clinical signs of the deficiencies are rarely pathognomonic but loss of production, impaired reproduction performances or increased morbidity/mortality rates are mostly observed. In a European critical economic context, especially for milk production, it is not easy to convince the farmer to invest in diagnosis and/or trace mineral supplementation. Nevertheless, it is important to investigate the nutritional status of the herd to improve global herd health. This presentation aims to present the interest of the diagnosis of trace mineral deficiencies as well as the different manners to investigate this nutrition trouble at a herd level. Trace mineral supplementation solutions will be briefly discussed. [less ▲]

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See detailVariable selection in proportional hazards cure model with time-varying covariates, application to bank failures
Beretta, Alessandro ULg; Heuchenne, Cédric ULg

Conference (2017, June)

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank ... [more ▼]

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank failures suggests the existence of banks which are not susceptible to default. For this reason, we use a semi-parametric proportional hazards cure model with time-varying covariates to study their effects either on the probability that a bank is susceptible to default and on the survival time of failed institutions. We propose a penalized maximum likelihood method for the selection of the most significant variables, using a Smoothly Clipped Absolute Deviation (SCAD) penalty. A simulation study shows that this procedure performs reasonably well. We apply this methodology to a quite large sample of United States commercial banks insured by the Federal Deposit Insurance Corporation (FDIC) and with more than 50 million dollars of total assets during the last quarter of 2002. More in detail, we use bank-specific covariates observed on a quarterly basis until the end of 2015, that we use as proxies for capital adequacy, asset quality, earnings, management efficiency, liquidity, cost structure and size. [less ▲]

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See detailShallow water model with anisotropic porosity for flood modelling on Cartesian grids
Bruwier, Martin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Conference (2017, June)

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time ... [more ▼]

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time remains too high for many practical applications. In contrast, models solving the shallow-water equations with porosity provide a useful tool to improve the computational efficiency, while preserving to some extent the detailed topographic information through porosity parameters. In this study, we present a new model solving the fully dynamic shallow water equations with anisotropic porosity based on Cartesian grids. Using a Cartesian grid leads to specific challenges, particularly as regards the definition of the conveyance porosities at the cell edges. Moreover, the presented model is further improved by a merging method so as to increase the computational efficiency without affecting the overall accuracy. The performance of the model has been evaluated based on a wide range of test cases, which confirm the validity of the model and the benefits of such a modelling framework. [less ▲]

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See detailProfiling inferior left dorsal premotor cortex: when Area 55b meets Premotor Eye-Field
Genon, Sarah ULg; Reid, Andrew; Langner, Robert et al

Poster (2017, June)

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See detailDynamic stall onset variation with reduced frequency for three stall mechanisms
Boutet, Johan ULg; Dimitriadis, Grigorios ULg; Amandolese, Xavier

in Proceedings of the IFASD 2017 Conference (2017, June)

Asetofunsteadyaerodynamicloadmeasurementisperformedonthreeoscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in pitch ... [more ▼]

Asetofunsteadyaerodynamicloadmeasurementisperformedonthreeoscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in pitch around the stall angle of attack with prescribed frequency and amplitude. A criterion proposed by Sheng et al. is used to locate the onset of the flow separation process associated with dynamic stall, and quantify its variation with an equivalent reduced pitch rate. The validity of this criterion is tested for the three airfoils at low Reynolds number, Re = 2 × 10^4. Results are compared with the experimental data obtained by Sheng et al. at higher Reynolds number of Re = 1.5 × 10^6. [less ▲]

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See detailNumerical simulations of a non-charring ablator in high enthalpy flows by means of a unified flow-material solver
Schrooyen, Pierre; Coheur, Joffrey ULg; Turchi, Alessandro et al

Conference (2017, June)

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See detailGelfand duality for compact pospaces
De Rudder, Laurent ULg

Conference (2017, June)

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of ... [more ▼]

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of dualities between compact Hausdorff spaces, C^\star-algebras, compact regular frames and de Vries algebras. Three of these dualities have been extended to dualities between compact pospaces, stably compact frames and proximity frames, the fourth part of the square being lacking. We propose the category of bounded Archimedean l-semi-algebra to complete what will be the outside square of dualities and to extend to category of C^\star-algebras. [less ▲]

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See detailNew data on the Mesozoic radiation of chelonioids
Scavezzoni, Isaure ULg; Fischer, Valentin ULg

Poster (2017, June)

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs ... [more ▼]

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs, curved limbs, anapsid skull exempt of temporal fenestrae) and ecology has often obscured their relationships and, hence, their evolutionary history, notably in marine turtles (chelonioids). Modern chelonioids are divided in two clades (i. e. : shoft-shelled turtles and hard-shelled turtles) supported by distinct morphological and embryological characters. Their origin is traced back up to the Cretaceous, along with a series of extinct forms, many of which being collectively known as Protostegidae. Fossil evidence show that at least five clades of marine turtles were roaming the seas at the end of the Cretaceous. In fact, chelonioids appeared during the first stages of the Early Cretaceous and quickly exploded to reach a high level of disparity at the lowermost part of the late Cretaceous. Therefore, the Mesozoic radiation of chelonioids must have happened during the "middle" Cretaceous (especially the Aptian-Albian interval). However this radiation is poorly understood as the phylogenetic relationships of marine turtles are not resolved yet. Bringing new data may help resolve these issues, and it is the exact reason why the genus Rhinochelys is being investigated. [less ▲]

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See detailSafety update on dapagliflozin (DAPA) across the phase 2b/3 clinical trial program
Jabbour, Serge; Seufert, Jochen; SCHEEN, André ULg et al

Poster (2017, June)

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