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See detailA Markov-switching Generalized additive model for compound Poisson processes, with applications to operational losses models
Hambuckers, julien ULiege

Conference (2017, July)

This paper is concerned with modeling the behavior of random sums over time. Such models are particularly useful to describe the dynamics of operational losses, and to correctly estimate tail-related risk ... [more ▼]

This paper is concerned with modeling the behavior of random sums over time. Such models are particularly useful to describe the dynamics of operational losses, and to correctly estimate tail-related risk indicators. However, time-varying dependence structures make it a difficult task. To tackle these issues, we formulate a new Markov- switching generalized additive compound process combining Poisson and generalized Pareto distributions. This flexible model takes into account two important features: on the one hand, we allow all parameters of the compound loss distribution to depend on economic covariates in a flexible way. On the other hand, we allow this depen- dence to vary over time, via a hidden state process. A simulation study indicates that, even in the case of a short time series, this model is easily and well estimated with a standard maximum likelihood procedure. Relying on this approach, we analyze a novel dataset of 819 losses resulting from frauds at the Italian bank UniCredit. We show that our model improves the estimation of the total loss distribution over time, compared to standard alternatives. In particular, this model provides estimations of the 99.9% quantile that are never exceeded by the historical total losses, a feature particularly desirable for banking regulators. [less ▲]

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See detailGood practices in adapted physical activity for cancer patients and survivors: opinion of the Raviva program participants
Rompen, Jérôme ULiege; Scharff, Jules; Cloes, Marc ULiege

Conference (2017, July)

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir ... [more ▼]

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir-mieux).The activities are supervised by instructors with inconstant trainings and experiences. Contrary to other countries, Belgian APA instructors do not necessarily need to follow specific education programs such those proposed by the ACSM (Schmitz et al., 2010) or other organizations that propose exercise guidelines for cancer survivors. The aim of this study was to identify good practices in APA for cancer patients and survivors concerning activity characteristics and instructors behaviors, from the point of view of the Raviva program participants. Methods Firstly, an online questionnaire was submitted to Raviva participants; 72 of them filled it in. Secondly, 3 video-stimulated recall interviews were conducted after 3 different Raviva sessions (fitness, yoga and aqua-aerobics), each time with another participant. Results and discussion The sessions characteristics that participants like the most are related to the choice and quality of the proposed exercises (22% of responses) and to the perceived benefits of the activities (20%). The most appreciated qualities for an instructor are related to his/her human qualities (43%) and his/her expertise (32%). What participants like least about the sessions is a poor organization (27%) and what they like least about the instructors is linked to bad choices of exercises (18%). The video-stimulated recall interviews confirmed these data and provided more precision. Finally, we noticed that differences in responses were observed depending on the type of activity participants took part in. These findings could help instructors adapt their practices to their participants’ needs in order to promote adherence to physical activity among this population. References Schmitz, K. H., Courneya, K. S., Matthews, C., Demark-Wahnefried, W., Galvão, D. a, Pinto, B. M., … Schwartz, A. L. (2010). American College of Sports Medicine roundtable on exercise guidelines for cancer survivors. Medicine and Science in Sports and Exercise, 42(7), 1409‑26. https://doi.org/10.1249/MSS.0b013e3181e0c112 [less ▲]

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

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 detailA field quantification of all inclusive fish-pass efficiency using a combined telemetry system
Ovidio, Michaël ULiege; Sonny, Damien; Dierckx, Arnaud ULiege et al

Conference (2017, July)

Detailed reference viewed: 29 (2 ULiège)
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See detailFish learned movements in a large regulated river
Capra, Hervé; Pella, Hervé; Ovidio, Michaël ULiege et al

Conference (2017, July)

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See detailPlanet remnants around evolved stars with CHEOPS
Van Grootel, Valérie ULiege

Conference (2017, July)

I will talk about the opportunity to study planets/asteroids/debris discs around evolved stars with CHEOPS. Compact, post-red giant stars (subdwarf B stars and white dwarfs) will be part of the core ... [more ▼]

I will talk about the opportunity to study planets/asteroids/debris discs around evolved stars with CHEOPS. Compact, post-red giant stars (subdwarf B stars and white dwarfs) will be part of the core program of TESS, which will provide, for the very first time, a census on the presence of planets/asteroids/debris discs around these stars. This will provide invaluable insights for the evolution of planetary systems and survival of close planets after the red giant phase. I will show how CHEOPS, with its larger collecting area and better sensitivity in the blue, could bring key added value to TESS for studying planets/asteroids/debris discs around evolved stars. [less ▲]

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See detailThe grammaticalization of Russian taxonomic nouns
Kolyaseva, Alena ULiege

Conference (2017, July)

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See detailFunctional refractory molds for metal casting built by additive manufacturing
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2017, July)

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting ... [more ▼]

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting remains not cost effective in case of prototypes and very small series due to the quite large amount time needed to build and dry the molds. Additive manufacturing may also be used to directly shape metal parts but several problems are still linked to this technique as the presence of local defects in parts and the limitation of the number of metal or alloy available for this technique on the market. We propose an intermediate method that permits to build directly molds and cores by additive manufacturing using equipment initially dedicated to build metal parts. This method presents the main advantage to cast with a large variety of metals or alloys using a single ceramic material and only one set of building conditions. The properties of the casted parts are very similar with those produced by investment casting. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of some casting defects. The use of alumina processed by selective laser melting (SLM) is shown and its outstanding resistance to temperature differential is demonstrated through casting trials with two diffferent representative alloys. Casting trials in industrial conditions will be illustrated. [less ▲]

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See detailIs a new definition of intermodal transport interesting for transferring flows from road to more environmentally friendly modes?
Mostert, Martine ULiege; Limbourg, Sabine ULiege; Caris, An

Conference (2017, July)

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like ... [more ▼]

Road remains the most used mode in Europe. 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 is identified by the European Commission 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 inland waterways (IWW). 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 goal is to determine the flow distribution of goods between direct transportation by road, rail or IWW, 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. For testing the hypothesis of intermodal transport attractiveness on medium to long distance, the model is applied to experimental data at the European level. [less ▲]

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See detailLa narrativité greimassienne comme élément d'organisation du sens dans le croisement du football et la publicité
Bassilua Nzuzi, Anicet ULiege

Conference (2017, June 30)

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine ... [more ▼]

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine, par exemple le système d’oppositions dans les figures-signes. Notre étude, consacrée aux pratiques du football et de la publicité telles qu’elles se réalisent et se croisent au stade, montre que la narrativité, en lien avec le système tensif des possibles, organise aussi le parcours du sens dans cette interaction. Cette opération se déroule à deux niveaux de pertinence hiérarchisés: niveau de l’organisation syntagmatique de chacun des deux ensembles (niveau inférieur) et niveau de leurs ajustements l’un vers l’autre (niveau supérieur). On repère ainsi, pour le football, par exemple une organisation syntagmatique qui se réalise par la succession des séquences (passe, tacle, but, etc.) qu’opèrent des sujets (joueurs) à partir d’un système ordonné des modes d’existence des unités (potentialisation /virtualisation - actualisation/réalisation). Pour la publicité, cela se réalise à travers l’agencement des syntagmes (topologiques, eidétiques, chromatiques) qui s’inscrivent sur les objets-supports (panneaux) selon le même schéma. Les deux univers s’ajustent par la suite grâce à la combinaison de deux types d’articulations (statiques et dynamiques) qui, au final, aboutit à la formation d’une sorte de discours englobant “football-publicité” qui présente une organisation syntaxique propre. [less ▲]

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See detailPopular Music Studies in French Universities
Pirenne, Christophe ULiege

Conference (2017, June 30)

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official ... [more ▼]

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official expert on that question. But between the study of a national or an international heritage, between scientific disciplines and humanities, researches devoted to popular music seems to be as perennial as fragmented. My paper will aim to present the evolution of recruitment in this area. Which disciplines were the most active in those recruitments and, beyond these raw numbers, what does it mean ? Why is the French academic situation so different to that of Italy for example ? What are the challenges of this academisation ? Which topics are taught under this heading ? I’d like to show that next to the objective reasons of this disciplinary interest, there are also various institutional issues that seems to correspond exactly to the assumptions of Bruno Latour (La science en action, 1989) and Edward Slowik (Structure of Musical Revolutions, 2007). [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 Viridiana ULiege; Vivas Romero, Maria ULiege

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 detailAntarctic cyanobacteria: from diversity to genomics
Wilmotte, Annick ULiege

Conference (2017, June 30)

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See detailLabor market transformation and new forms of self-organizing: the case of Italian Clap
Esposito, Giovanni ULiege; Pinto, Mauro; Trasciani, Giorgia

Conference (2017, June 30)

The late 20th century age of globalisation witnessed growing deregulation of national labour markets following the OECD (1994) guidelines. Some scholars (i.e. Avdagic and Crouch 2015) have argued that ... [more ▼]

The late 20th century age of globalisation witnessed growing deregulation of national labour markets following the OECD (1994) guidelines. Some scholars (i.e. Avdagic and Crouch 2015) have argued that labour market deregulation has resulted into a growth of “precarious work”, a non-standard form of employment that is poorly paid, insecure, unprotected, and cannot support a household. Traditional trade unions organizations have failed in addressing the needs of this fraction of the working class. Indeed, some commentators (Näswall et al. 2004) have showed that greater levels of subjective job insecurity tend to be systematically correlated with less member satisfaction with unions, less identification with unions and a stronger desire to leave unions. Our presentation addresses this issue as well as the process through which precarious workers organize and find new collective strategies to defend and improve their working conditions. [less ▲]

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See detailDe la caricature à la bande dessinée, et retour : enjeux poétiques et médiatiques d’une affinité (1830-1890)
Stienon, Valérie ULiege

Conference (2017, June 29)

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de ... [more ▼]

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de l’art séquentiel au XIXe siècle ? La bande dessinée et la caricature ne sont pas seulement deux langages qui s’accommodent l’un à l’autre sur des supports partagés, en journal et en album, mais aussi des formes d’expression résultant de conditions techniques de production du texte-image, de réseaux éditoriaux croisés et d’une inscription dans l’actualité socioculturelle. On sait l’importance de l’équipe Aubert, pionnière de la caricature de presse, dans la reprise de l’œuvre de Töpffer via la collection des Jabots. Il reste à comprendre pourquoi certains caricaturistes ont initié l’art séquentiel sans l’affirmer comme tel (cas de J.J. Grandville) et comment la bande dessinée s’est approprié spécifiquement la pratique de la charge à mesure qu’elle trouvait son propre développement (voir notamment l’œuvre de Christophe). Centrée sur la production de la période 1830-1890, la communication propose d’examiner la culture matérielle qui détermine les diverses réorganisations du dispositif unissant la vignette à la légende, et d’étudier sous cet angle le triple rapport à l’actualité, à la sérialité et à l’humour qui anime conjointement la caricature et la bande dessinée. [less ▲]

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See detailLes risques du voyageur interculturel
Ozer, Pierre ULiege

Conference (2017, June 29)

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See detailNetwork DEA with Common Weights
Hatami Marbini, Adel ULiege

Conference (2017, June 29)

Data envelopment analysis (DEA) generally includes two properties. First, DEA is based upon the overall efficiency without observing the internal structure of a production system. Second, a multiplier DEA ... [more ▼]

Data envelopment analysis (DEA) generally includes two properties. First, DEA is based upon the overall efficiency without observing the internal structure of a production system. Second, a multiplier DEA model allows a production system to select input and output weights in a total flexible way. However, it is essential to deal with these two properties in reality. This paper presents a common-weights DEA model where the internal structure of a production system is known. We also present a numerical example to exemplify the applicability of the proposed model in this research. [less ▲]

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See detailInfrastructures in the Making: The Case of a Public Broadcasting Operator
Jemine, Grégory ULiege; Pichault, François ULiege; Dubois, Christophe ULiege

Conference (2017, June 29)

This contribution explores how actors redefine infrastructures through an analysis of a project of “modernisation” in the making. Nowadays several companies undertake serious reflexions about their work ... [more ▼]

This contribution explores how actors redefine infrastructures through an analysis of a project of “modernisation” in the making. Nowadays several companies undertake serious reflexions about their work environments, tools and practices according to the “Bricks”, “Bytes” and “Behaviours” motto (De Leede, 2017). Relying on digital solutions they aim to enhance more flexible work practices in time and space. For that purpose various strategic and operational actors contribute actively to foreseeing the future of both facility, technological and social infrastructures. By means of adjustment mechanisms such as coordination meetings and alignment speeches, the actors take various actions in order to ensure the continuity of the organisation; they perform what Ribes and Finholt named the “Long Now”, an ongoing work to generate a “sustainable future” (2009, p. 377). Our interest lies in exploring simultaneously the incremental deconstruction of the existing infrastructures and the progressive construction of the forthcoming work environment. This innovation process may be seized by studying successive waves of problematisation using the actor-network theory. In the perspective of the ANT, an organisation is always a precarious agency made of both people and artefacts (Latour, 2005). Material issues, technological opportunities and constraints as well as power games emerge through the analysis of “controversies” which make parts of the infrastructures noticeable and subject to discussion and negotiation. Those controversies evolve through time, revealing various “range of visibilities” of people and things at different times in the process (Larkin, 2013, p. 336). Our research shows how actors simultaneously make sense of the existing infrastructure while enacting its future developments. We point out how the actors themselves perceive, describe and draw on the infrastructure in order to make sense of the strategic objectives, to conduct the change project and to maintain their institution. We shed light on the process of redefining and reshaping the infrastructure itself through controversies and adjustments. [less ▲]

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

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 detailL’usage vocal des professeurs de formation musicale
Remacle, Angélique ULiege; Schiller, Isabel ULiege; Sfez, Lou et al

Conference (2017, June 29)

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent ... [more ▼]

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent l’apprentissage de la rythmique, de la lecture et de l’écriture de partitions, la pratique du chant, le développement de l’oreille musicale, ou encore la constitution d’un répertoire de référence. Ces enseignements sont dispensés dans des académies de musique ou des conservatoires. En tant que professionnels de la voix, ces professeurs font partie des travailleurs les plus à risque de consulter un phoniatre pour leur voix (1). Cependant, leur usage vocal reste peu décrit. Cette étude a pour objectif 1) de mesurer la charge vocale de professeurs de formation musicale en contexte professionnel et extra-professionnel, 2) de décrire l’influence du bruit ambiant sur leur voix et 3) d’identifier l’impact de la charge vocale sur leur qualité et leur fatigue vocale. Méthode : 13 professeurs de formation musicale (9 femmes, 4 hommes) ont été enregistrés pendant une semaine complète à l’aide d’un dosimètre vocal (VoxLog) porté du lever au coucher. Le dosimètre mesure la durée de phonation et la fréquence vocale (F0) avec un accéléromètre, ainsi que l’intensité de la voix et du bruit ambiant avec un microphone positionné au niveau du cou. L’analyse du signal est réalisée avec le logiciel VoxLog Discovery. Ce logiciel calcule notamment le nombre d’oscillations des plis vocaux par jour. A la fin de chaque journée, les professeurs ont auto-évalué leur qualité et leur fatigue vocale à l’aide d’échelles visuelles analogiques. Résultats : Les paramètres vocaux et le bruit ambiant sont significativement plus élevés en contexte professionnel qu’extra-professionnel (p<.001). L’élévation du bruit ambiant est accompagnée d’une élévation de l’intensité vocale pour les 13 professeurs (r=.61, p<.001), ainsi que d’une augmentation de F0 pour les femmes (r=.41, p=.002) mais non pour les hommes (r=.39, p=.055). Enfin, le bruit ambiant élevé est associé à une augmentation de la durée de phonation (r=.05, p<.001). L’augmentation du nombre d’oscillations journalier des plis vocaux est associée à une augmentation de la fatigue (r=0.438, p<.001) et à une diminution de la qualité vocale (r=-0.538, p<.001). Conclusion : De façon similaire aux professeurs d’école (2), les paramètres vocaux ainsi que le bruit ambiant sont significativement plus élevés en contexte professionnel. Sur leur lieu de travail, les professeurs d’éducation musicale sont confrontés à un bruit ambiant dépassant la limite recommandée par l’OMS (3). En accord avec l’effet Lombard, ce bruit élevé est associé à une augmentation de l’intensité vocale. Chez les femmes, une voix plus aigüe est observée en environnement bruyant. Comme dans l’étude de Ternström, Södersten et Bohman (4), un bruit ambiant élevé est associé à une durée de phonation plus importante, potentiellement dû à une prolongation des segments voisés par souci d’intelligibilité. En conclusion, les professeurs de formation musicale utilisent leur voix de manière intensive dans le cadre de leur travail, alternant voix parlée et voix chantée. Les corrélations entre le nombre d’oscillations journalier et les auto-évaluations montrent que la quantité de voix utilisée a un impact sur le ressenti des participants. De plus, l’élévation du bruit est corrélée à une augmentation des paramètres de charge vocale. Bibliographie 1. Remacle, A., Petitfils, C., Lejeune, L., Finck, C., & Morsomme, D. (2015, April 10). What is the professional profile of patients in phoniatrics? Oral communication presented at the 4th International Occupational Voice Symposium, London, UK. 2. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57, 406-415. 3. Inserm. (2006). La voix : Ses troubles chez les enseignants (Expertise collective). Paris : Institut National de la Santé et de la Recherche médicale. 4. Ternström, S., Södersten, M., & Bohman, M. (2002). Correlation of simulated environmental noise as a tool for measuring vocal performance during noise exposure. Journal of Voice, 16(2), 195-206. [less ▲]

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

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 detailSpatial OnLine Analytical Processing Applied to Cities Security with Raster Data - A Case Study on Emergency Services of Brussels Agglomeration
Kasprzyk, Jean-Paul ULiege; Devillet, Guénaël ULiege

Conference (2017, June 29)

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social ... [more ▼]

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social media, cars, security camera, satellite images, crowdsourcing, geography portals, etc. Uses of these data are various. For instance, it is very precious to firefighters in order to fairly distribute their resources (equipment and men) on the territory. These large spatial data sets (“Big Data”) require powerful tools for their extraction and their analysis. For this purpose, an original Spatial OnLine Analytical Processing (SOLAP) model is developed for emergency services. A case study involving firefighters and medical aids of Brussels is presented [less ▲]

Detailed reference viewed: 22 (2 ULiège)
See detailExpliciter, ralentir et approfondir la schématisation en recherche qualitative
Lejeune, Christophe ULiege

Conference (2017, June 29)

Les méthodes de recherche qualitative existent depuis la naissance des sciences sociales. Il faut cependant attendre les années 1960 pour que Barney Glaser et Anselm Strauss en proposent une formalisation ... [more ▼]

Les méthodes de recherche qualitative existent depuis la naissance des sciences sociales. Il faut cependant attendre les années 1960 pour que Barney Glaser et Anselm Strauss en proposent une formalisation s'appuyant sur les usages alors en cours. Cette formalisation repose essentiellement sur le codage du matériau empirique (coding), la tenue du journal de recherche (memoing) et le traçage de diagrammes (diagramming). Les diagrammes en question se composent de bulles (nœuds) reliées entre elles par des lignes (arcs). Les graphes résultants ne sont ni hiérarchiques ni orientés (sauf avec certaines techniques spécifiques, comme l'analyse structurale). Dès leur formation, les étudiants en sciences sociales apprennent à penser au moyen de ces diagrammes typiques de l'analyse qualitative. Leur sémantique n'est cependant pas stabilisée. Selon les praticiens, une telle indétermination encourage d'ailleurs la créativité. Mais ces implicites en compliquent également l'appropriation par les étudiants. C'est donc essentiellement à des fins didactiques, que j'ai explicité le mode de construction de ces représentations graphiques dans mon «Manuel d'analyse qualitative. Analyser sans compter ni classer» (2014). J'y explicite une étape intermédiaire entre le codage et la schématisation, étape correspondant bien à la méthode qualitative, mais restée implicite jusqu'ici. Cette étape ralentit délibérément la réflexion de l'analyste au moment crucial de la conceptualisation. Ce faisant, elle l'approfondit... quand elle ne débouche pas sur la circonspection. [less ▲]

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See detailExperimental characterisation of tape spring nonlinear compliant mechanisms
Dewalque, Florence ULiege; Schwartz, Cédric ULiege; Denoël, Vincent ULiege et al

Conference (2017, June 29)

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving ... [more ▼]

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving buckling, the formation of folds, nonlinear vibrations and hysteresis, an experimental set-up is designed. Dynamic and quasi-static tests are performed, as well as small amplitude vibration tests and large amplitude deployments in order to collect data in a broad variety of cases. The acquisition equipment consists of a 3D motion analysis system which triangulates the position of active markers and a force plate. The reproducibility of the acquisitions is assessed and the parameters affecting the measurements are identified. In the end, a finite element model is developed and correlated with the experimental results. [less ▲]

Detailed reference viewed: 42 (7 ULiège)
Peer Reviewed
See detailSynthetic Rhamnolipid Bolaforms (SRBs) as inducers of plant innate immunity
Luzuriaga-Loaiza, Patricio ULiege; Schellenberger, Romain; Touchard, Matthieu et al

Conference (2017, June 28)

Natural and synthetic elicitors have demonstrated a high potential for a more sustainable agriculture and the control of plant diseases via the induction of plant defense responses. Microbial ... [more ▼]

Natural and synthetic elicitors have demonstrated a high potential for a more sustainable agriculture and the control of plant diseases via the induction of plant defense responses. Microbial biosurfactants like surfactin (Bacillus spp.) and rhamnolipids (Pseudomonas spp.) have recently been shown to stimulate the plant innate immune system. Unlike canonical elicitors exemplified by bacterial flagellin, some data suggest that surfactin and rhamnolipid perception do not depend on the presence of specific receptors in the plant cell but rather on the direct interaction of the molecules with the lipid phase of the plant plasma membrane. Moreover, surfactin and rhamnolipid interactions with plant cells are thought to depend on their amphipathicity and the length of their acyl chain. In an attempt to mimic the efficacy of these natural biosurfactants, we have synthesized via green chemistry new bio-inspired amphiphilic elicitors. In this work, we present the characterization of Arabidopsis innate immunity in response to synthetic rhamnolipid bolaforms (SRBs) with variable acyl chain lengths. Using an original pluridisciplinary approach that covers biophysical and biological assays, we assessed the capacity of SRBs to interact with plasma membranes and to stimulate defense responses in Arabidopsis thaliana. Our results show that SRBs, depending on the acyl chain length, differentially activated early and late immunityrelated signaling events, defense gene expression and cell death. Moreover, we have demonstrated that an unsaturated SRB containing a C14 acyl chain is effective to induce local resistance against the hemibiotrophic bacteria Pseudomonas syringae pv. tomato. The biophysical studies suggest that a direct interaction of the SRB C14 with the plasma membrane lipids would be involved in the plant perception and induction of plant immunity. [less ▲]

Detailed reference viewed: 73 (6 ULiège)
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See detailThermal history modelling to understand microstructures observed in repair technology of Ti-6Al-4V
Tomé Jardin, Ruben Antonio ULiege; Tchuindjang, Jérôme Tchoufack ULiege; Paydas, Hakan ULiege et al

Conference (2017, June 28)

Study of laser cladding as a possible technology to repair Ti-6Al-4V. Development of a FEM thermal to predict microstructure.

Detailed reference viewed: 28 (6 ULiège)
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See detailOn the transition between symmetric and asymmetric flow in rectangular shallow reservoirs - a case of maximum energy dissipation?
Westhoff, Martijn; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

Conference (2017, June 28)

Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with ... [more ▼]

Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with identical recirculation zones on both sides. In longer reservoirs, the main jet reattaches to the side of the reservoir leading to small and large recirculation zones. Previous studies have found an empirical geometric relation describing the switch between these two flow patterns. In this study, we demonstrate, with a simple analytical model, that this switch coincides with a maximization of energy dissipation in the shear layer between the main jet and recirculation zones: Short reservoirs dissipate more energy when the flow pattern is symmetric, while longer reservoirs dissipate more energy with an asymmetric pattern. This approach enables the prediction of the flow patterns without detailed knowledge of small scale processes, potentially useful in the early phase of reservoir design. [less ▲]

Detailed reference viewed: 38 (0 ULiège)
See detailInfluence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting
Delahaye, Jocelyn ULiege; Rigo, Olivier; Lecomte-Beckers, Jacqueline ULiege et al

Conference (2017, June 28)

Al alloy AlSi10Mg processed by Selective Laser Melting displays a very fine cellular eutetic microstructure (melt pool fine, MP fine) due to fast cooling rate from the melt. Such microstructural ... [more ▼]

Al alloy AlSi10Mg processed by Selective Laser Melting displays a very fine cellular eutetic microstructure (melt pool fine, MP fine) due to fast cooling rate from the melt. Such microstructural refinement results in high tensile strength and hardness. Studies have shown that a coarser cells region (melt pool coarse, MP coarse) as well as a heat affected zone (HAZ) can be observed at the melt pool boundary caused by a change of thermal history [1]. Those microstructural inhomogeneities act like a weak zone as demonstrated by the laser tracks observed on fracture features after tensile test [2]. This study aims at investigating in which zone fracture occurs. To do so, MP fine, MP coarse and HAZ were analyzed. Si precipitates spacing was compared with dimples size observed on fracture features. The Si precipitates fraction were quantified by image analysis. Hardness tests were performed in the 3 different zones by nanoindentation. [1] Thijs et al., Acta Mater. 61 (2013) pp. 1809-1819 [2] Tang et al., JOM 69 (2017) pp. 516-522 [less ▲]

Detailed reference viewed: 71 (10 ULiège)
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See detailFrom local initiatives to territorial transition project: case study of a grassroots food belt project in Liège (Belgium)
Feyereisen, Marlène ULiege; Stassart, Pierre M ULiege; Jonet, Christian

Conference (2017, June 28)

This study analyses a local food initiatives in Liege (Belgium) linked to the Transition Network movement: Ceinture Aliment-Terre Liégeoise (CATL). The study aims to analyse how CATL evolved from a ... [more ▼]

This study analyses a local food initiatives in Liege (Belgium) linked to the Transition Network movement: Ceinture Aliment-Terre Liégeoise (CATL). The study aims to analyse how CATL evolved from a marginal grassroots movement, to a project of transition of the agri-food system which is considered exemplary by Belgian institutional actors. [less ▲]

Detailed reference viewed: 54 (6 ULiège)
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See detailAntimicrobial activities of key intermediate plant oxylipins
Deboever, Estelle ULiege

Conference (2017, June 28)

Nowadays, biopesticides have emerged as a main alternative to conventional agriculture. In this context, plant oxylipins, a vast and diverse family of secondary metabolites originated from polyunsaturated ... [more ▼]

Nowadays, biopesticides have emerged as a main alternative to conventional agriculture. In this context, plant oxylipins, a vast and diverse family of secondary metabolites originated from polyunsaturated fatty acids (PUFAs), appear to be crucial agents in plant defense mechanisms. Among plant oxylipins, the 13-hydroperoxy oxylipins (13-HPO) constitute key intermediate oxylipins (KIOs) as they can be converted into jasmonic acid, OPDA, dn-OPDA or traumatic acid, well-characterized components involved in plant resistance mechanisms. Their presumed functions include direct antimicrobial effect, stimulation of plant defense gene expression, and/or regulation of plant cell death. However, the precise contribution of each KIOs to plant defense remains essentially unknown. In this work, we focus on two h13-HPO, the 13(S)-hydroperoxy-octadecadienoic acid (13-HPOD) and the 13(S)-hydroperoxy-octadecatrienoic acid (13-HPOT). In vitro growth inhibition assays were performed to investigate the direct antimicrobial activities against 7 pathogens of agronomic interest including bacteria, oomycetes and fungi. This study showed unambiguously that 13-HPO are able to hinder growth of some plant microbial pathogens, generally with a higher efficacity for 13-HPOT. In order to get a better insight into their mechanism of action, a complementary in silico and experimental biophysical approach was applied. Biomimetic pathogen plasma membranes are used to study the mechanism at the molecular level. Slight conformational differences may have significant impacts on their ability to interact with pathogens lipids and plasma membranes. [less ▲]

Detailed reference viewed: 28 (1 ULiège)
Peer Reviewed
See detailFrom internal experts to external interlocutors? EU agencies and procedures assessing the equivalence of third country legal rules with EU regulatory standards
Van Cleynenbreugel, Pieter ULiege

Conference (2017, June 28)

this paper will offer an overview of procedures allowing EU agencies to determine the equivalence of third country regulatory regimes and conceptualise the accountability challenges they pose. Proceeding ... [more ▼]

this paper will offer an overview of procedures allowing EU agencies to determine the equivalence of third country regulatory regimes and conceptualise the accountability challenges they pose. Proceeding in three parts, the first part will identify and classify the different third country equivalence procedures in place. Analysing the legal basis for agency intervention and the specific powers granted to the respective agencies in that respect, this part will allow to develop a topology of two different equivalence roles conferred on EU agencies. Building upon this descriptive analysis, the second part will identify two accountability challenges associated with each of the identified third country equivalence procedure categories. Seeking to overcome those challenges, the third part of the paper will make four pointed suggestions aimed at recognising explicitly and in a more centralised way the external action powers conferred on EU agencies. Doing so would at the very least allow better to tailor modifications to the external action frameworks against the background of which existing equivalence procedures currently already implicitly operate. [less ▲]

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See detailAbsent, yet present? Tracing "Responsible Research and Innovation" in Radiation Protection Research
Van Oudheusden, Michiel ULiege

Conference (2017, June 28)

In this paper, I argue that although the notion of responsible research and innovation (RRI) is manifestly absent in research programs for radiation protection and nuclear research and training, RRI is ... [more ▼]

In this paper, I argue that although the notion of responsible research and innovation (RRI) is manifestly absent in research programs for radiation protection and nuclear research and training, RRI is increasingly recognized, and mobilized, by various actors in the field; is an essentially contested concept; and facilitates the development of a sizeable network comprising actors with a variety of roles, expectations and stakes, including researchers in the social sciences and humanities (SSH). To sustain these points, I draw on my experiences as an embedded social scientist in nuclear research, singling out sites and instances (e.g. the crafting and dissemination of the 2015 Ricomet Public Declaration, SSH research within the EU-Concert framework, conversations with radiation protection researchers) where RRI is explicitly discussed, propagated, negated, or transformed. This exploration highlights recurring challenges of “translating” RRI to radiation protection research, such as the strong evaluative connotation of RRI and its top-down character; the lack of industry involvement in RRI processes; the tight connection between RRI and new and emerging technologies; and the hybridization of SSH through inter- and transdisciplinary research. I discuss each of these challenges in turn, with the aims of reflexively considering how RRI is co-produced in radiation protection research through negotiations between stakeholders and the interplay of practices and artifacts; and what the potential implications of these processes are for SSH engagement in the field. [less ▲]

Detailed reference viewed: 13 (0 ULiège)
Peer Reviewed
See detail"Exploring Experiences of Inequality in European Urban Centers: Towards an Intersectional and Transnational Approach."
Vivas Romero, Maria ULiege; 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 detailWear behaviour of laser clad High Speed Steels thick deposits
Hashemi, Seyedeh Neda ULiege; Tchuindjang, Jérôme Tchoufack ULiege; Dedry, Olivier ULiege et al

Conference (2017, June 28)

The wear behaviour of 4 different High Speed Steel (HSS) thick coatings (one cast material and 3 laser clad deposits with varying Mo, V and W contents) was investigated at 2 different test temperatures, i ... [more ▼]

The wear behaviour of 4 different High Speed Steel (HSS) thick coatings (one cast material and 3 laser clad deposits with varying Mo, V and W contents) was investigated at 2 different test temperatures, i.e. at room temperature and at 300°C. For all four materials under both test conditions, oxidative wear was identified as the main wear mechanism. The 3 laser clad deposits exhibit a higher wear resistance compared to the conventional cast reference material, and this effect was mainly attributed to their strongly refined microstructures. Moreover, a detailed comparison of the wear behaviour of the 3 laser clad deposits, in correlation with their microstructures, allows a better understanding of the effect of the different carbides and of their morphology. [less ▲]

Detailed reference viewed: 52 (16 ULiège)
See detailIs going to space still worthwhile?
Rochus, Pierre ULiege

Conference (2017, June 27)

Very often, we hear: “Is it still worth going to space? Aren’t there better causes to spend our money on, here on Earth?” At this talk, Pierre Rochus will highlight the importance of the benefits that ... [more ▼]

Very often, we hear: “Is it still worth going to space? Aren’t there better causes to spend our money on, here on Earth?” At this talk, Pierre Rochus will highlight the importance of the benefits that space activities and space research bring. He will try to convince the credulous that besides those everyday space applications that we obviously can no longer do without (GPS, for instance!), space science activities are also essential for humanity. Space research not only gives answers to fundamental questions facing humanity but the technical design of future missions also poses a challenge to the collective imagination. Space scientific research is not only an intellectual challenge, it is much more: it is a stimulus for technical developments; it requires constant, leading-edge developments in different technical domains such as:  systems miniaturisation,  light detectors,  new materials,  coatings,  cryogenics,  mechanisms,  electrical motors,  tribology (the study of friction, wear, lubrication, and the design of bearings)  ... Space Research gives rise to spin-offs and unpredictable developments which will come in useful in our future daily life. One hope is that some part of the huge budgets dedicated to military research could be transferred to space activities. And, of course, it is very important to convince young people to study sciences and technology - where better to start, than in space? [less ▲]

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See detailUnraveling the molecular mechanisms controlling flowering in the model temperate grass Brachypodium distachyon
Bouché, Frédéric ULiege; Woods, D.P.; Amasino, R.M.

Conference (2017, June 27)

Controlling the timing to flowering is an essential aspect of agriculture, either by delaying flowering to maximize storage in root crops or by initiating flowering when conditions are favorable to ... [more ▼]

Controlling the timing to flowering is an essential aspect of agriculture, either by delaying flowering to maximize storage in root crops or by initiating flowering when conditions are favorable to maximize seed or fruit production. The extensive studies on the model Brassicaceae Arabidopsis thaliana revealed dozens of genes whose mutation alters flowering time. Comparatively, relatively little is known about the genetic mechanisms controlling flowering in Pooideae, a group of grasses that includes important crops such as wheat, barley, and oat. In recent years, Brachypodium distachyon—a small grass from the Pooideae group—has been increasingly used as a model plant to study the genetic mechanisms controlling developmental processes in temperate grasses, including flowering. Here, we report our recent contributions to the comprehension of the mechanisms controlling flowering time in Brachypodium: (i) we used a quantitative trait locus (QTL) analysis to identify genomic regions controlling flowering under a variety of photoperiod and vernalization conditions. This analysis was carried out on a recombinant inbred line population resulting from the cross between Bd21 and Bd1-1, two accessions with contrasting flowering behaviors. We identified six significant QTLs, three of which colocalized with major flowering regulators (VERNALIZATION1/PHYTOCHROME C, VERNALIZATION2, and FD), while others were not associated with known flowering-time genes. The genetic regions corresponding to these QTLs were further analyzed to identify candidate genes possibly involved in the control of flowering time. (ii) We used forward genetic screens to identify new flowering-time mutants, which are currently being analyzed. The characterization of the genes identified through these approaches will contribute to improve our knowledge of the molecular networks governing the transition to flowering in temperate grasses. [less ▲]

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See detailAtmospheric free acidity from cloud processing
Franco, Bruno ULiege; Taraborrelli, Domenico; Gromov, Sergey et al

Conference (2017, June 27)

Detailed reference viewed: 41 (5 ULiège)
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See detailProxima Cen b: theoretical spectral signatures for different atmospheric scenarios
Defrere, Denis ULiege; Léger, Alain; Grenfell, John Lee et al

Conference (2017, June 27)

Proxima Cen b is possibly the nearest rocky exoplanet orbiting in the habitable zone of its star and might represent by consequent a formidable opportunity for astrobiology. In this presentation, we ... [more ▼]

Proxima Cen b is possibly the nearest rocky exoplanet orbiting in the habitable zone of its star and might represent by consequent a formidable opportunity for astrobiology. In this presentation, we discuss several possible atmospheric compositions and present the corresponding infrared spectrum computed with modern planetary atmosphere models. To be specific, we consider (1) a bare planet, which has lost its atmosphere; (2) a water-ocean planet; (3) an Earth-analog planet; and (4) a planet similar to Earth but with a lower O2 pressure (< 1mbar) that produces a false positive for the triple signature (H20, O3, and CO2). We discuss the information contained in each infrared spectrum and the possibility to constrain the nature of the planet by remote sensing. We end this presentation by describing an instrumental concept recently proposed to ESA and optimised for this task. [less ▲]

Detailed reference viewed: 30 (1 ULiège)
Peer Reviewed
See detailEmergency Medical Services: When Fatigue Becomes The Norm.
Berastegui, Pierre ULiege; Jaspar, Mathieu ULiege; GHUYSEN, Alexandre ULiege

Conference (2017, June 27)

BACKROUND: Emergency Medical Services (EMS) routinely work at the very limit of their capacity due to growing emergency rooms visits and residents’ shortage. In this context, EMS workers are regularly ... [more ▼]

BACKROUND: Emergency Medical Services (EMS) routinely work at the very limit of their capacity due to growing emergency rooms visits and residents’ shortage. In this context, EMS workers are regularly asked to work more than 10 hours a day, on varying shifts and with short recuperation breaks. Two approaches can be used to reduce fatigue-related risk: reducing the likelihood a fatigued operator is working (i.e. fatigue reduction), or reducing the likelihood a fatigued operator will make an error (i.e. fatigue proofing). In Emergency Medical Services, formal risk control mainly focuses on reduction strategies such as reducing work hours while proofing strategies develops as an implicit element of the safety system. OBJECTIVE: Our purpose is to identify individual proofing and reduction strategies used by emergency residents and to investigate how they relate to fatigue, performance and patient safety indicators. METHODS: First, we conducted 4 focus-group sessions with a total of 25 EMS residents to elicit perceived consequences of fatigue and strategies used to cope with them. Focus group results were used to design a questionnaire assessing how often EMS residents personally used any of the strategies reported during sessions. Second, we administered the questionnaire to a larger sample and conducted a prospective observational study with a repeated within-subjects component. A total of 45 EMS residents participated in the study for a total of 400 shifts analyzed. We gathered sleep diaries, subjective sleepiness, reaction time, self-reported medical errors and performance ratings at different time point during both day and night shift using an android-based application. Sleep time and activity levels were confirmed using wrist actigraphy. DISCUSSION: We will discuss what can be drawn from our results in terms of individual and collective resilience processes with a focus on the potential for implementation of more formal processes at a system level.  [less ▲]

Detailed reference viewed: 35 (4 ULiège)
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See detailCharacterizing exoplanetary atmospheres with a mid-infrared nulling interferometer
Defrere, Denis ULiege; Léger, Alain; Absil, Olivier ULiege

Conference (2017, June 27)

The discovery of an increasing number of terrestrial planets around nearby stars marks the dawn of a new era in the exoplanet field: the characterization and understanding of their atmospheres. To make ... [more ▼]

The discovery of an increasing number of terrestrial planets around nearby stars marks the dawn of a new era in the exoplanet field: the characterization and understanding of their atmospheres. To make significant progress, it becomes clear that a large number of exoplanetary atmospheres have to be studied at various wavelengths. This is particularly relevant for identifying possible bio-signatures. In this talk, we present a concept of a space-based mid-infrared nulling spectrograph that can characterize a large number of exoplanetary atmospheres and provide key information on their size, surface temperature, and the presence of key molecules such as CO2, H2O, CH4 and O3. The proposed mission concept would be particularly suited to characterize Proxima Cen b. [less ▲]

Detailed reference viewed: 25 (5 ULiège)
See detailInstrumentation, magnetic and electrical characterization of superconductors
Vanderbemden, Philippe ULiege

Conference (2017, June 27)

Detailed reference viewed: 17 (0 ULiège)
See detailChine-Costa Rica. La projection des normes chinoises en Amérique centrale
Wintgens, Sophie ULiege

Conference (2017, June 27)

Cet article a pour hypothèse que l’accroissement des échanges économiques et commerciaux de la Chine avec le Costa Rica, premier pays membre du Système d’intégration centraméricain (SICA) à avoir signé un ... [more ▼]

Cet article a pour hypothèse que l’accroissement des échanges économiques et commerciaux de la Chine avec le Costa Rica, premier pays membre du Système d’intégration centraméricain (SICA) à avoir signé un accord de libre-échange avec Pékin, va de pair avec la projection des normes économiques et politiques chinoises en Amérique centrale. Afin de démontrer cette hypothèse, il article analyse les enjeux de la présence de la Chine au Costa Rica afin de voir si sa politique commerciale envers l’Amérique centrale est porteuse d’un projet économico-politique régional. [less ▲]

Detailed reference viewed: 13 (2 ULiège)
See detailThe Mars atomic oxygen dayglow: predictions based on the OI 297.2 nm MAVEN/IUVS observations
Gkouvelis, Leonardos ULiege; Gérard, Jean-Claude ULiege; Hubert, Benoît ULiege

Conference (2017, June 23)

The oxygen green line at 557.7 nm corresponds to the 1S →1D forbidden transition of the O atom. It shares the same upper level as the 1S→ 3P UV line at 297.2 nm. The green line is a major component of the ... [more ▼]

The oxygen green line at 557.7 nm corresponds to the 1S →1D forbidden transition of the O atom. It shares the same upper level as the 1S→ 3P UV line at 297.2 nm. The green line is a major component of the visible terrestrial dayglow spectrum and accounts for the dominant color of the high-latitude auroral display. The 297.2 nm emission was first detected with spectrometers on board the Mariner missions. It has since has been observed at the limb in the Martian dayglow with the SPICAM (Mars Express) and IUVS (MAVEN) spectrographs. The sources of the 1S excitation in the Mars dayglow are electron impact on O, photodissociation and electron impact dissociation of CO2 and CO and dissociative recombination of O2+ ions. [less ▲]

Detailed reference viewed: 10 (1 ULiège)
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See detailLatest results with LBTI's Vortex coronagraph: real-time tip/tilt sensing, new data reduction algorithms, and YSO observations
Defrere, Denis ULiege; Hinz, Philip; Absil, Olivier ULiege

Conference (2017, June 23)

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They enhance the dynamic range at very small inner working angle ... [more ▼]

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They enhance the dynamic range at very small inner working angle (down to the diffraction limit of the telescope) and provide a clear 360 degree discovery space for high-contrast direct imaging of exoplanets. In 2013, we installed and commissioned an L-band coronagraph in LBTI/LMIRCam and obtained outstanding images of the four planets around HR8799 during the first hours on sky. In this presentation, we will present the results of the latest data reduction performed with the VIP software that is developed at the University of Liège and that features state-of-the-art image processing algorithms inherited from the field of background subtraction in computer vision (including machine learning algorithms and low rank modeling algorithms). We will also present the results obtained with the second L- and M-band coronagraph that was recently installed in LMIRCam to enable binocular Vortex observations. During the first observations (October 2016), we tested and validated a new real-time post-coronagraphic tip-tilt sensing technique (called QACITS) to quickly align each beam on the center of their respective Vortex coronagraph and obtained observations of a young star showing disk features near the resolution limit of each aperture. Finally, we will present some exciting prospects for the Vortex coronagraph that will be installed on VISIR and ELT/METIS. [less ▲]

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See detailLe contrôle du respect des droits fondamentaux de ses condamnés par la Cour pénale internationale : théorie et pratique naissante
Deprez, Christophe ULiege

Conference (2017, June 23)

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l ... [more ▼]

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l'Université de Liège. [less ▲]

Detailed reference viewed: 33 (0 ULiège)
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See detailLes rouleaux littéraires coptes de papyrus (fin du IIIe - VIIe siècle)
Carlig, Nathan ULiege

Conference (2017, June 23)

Detailed reference viewed: 20 (2 ULiège)
Peer Reviewed
See detailQuatre années d'un chantier au XVIe siècle : la façade méridionale de la collégiale Saint-Martin de Liège
Joly, Emmanuel ULiege

Conference (2017, June 23)

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d ... [more ▼]

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d'appréhender, parfois avec précision, la chronologie et les modalités de la reconstruction de cette église. Ainsi, au chantier du chœur, dont la première pierre est posée en 1511, succède le chantier du transept et de la nef, qui fait l'objet d'un contrat signé en 1539 entre le chapitre et le maître maçon Paul de Richelle. Dans cette communication, nous proposons un focus sur les quatre premières années du chantier de la nef et du transept. La période située entre 1539 et 1543 constitue en effet un moment riche en événements clefs. En mars 1540, le chapitre de la collégiale demande explicitement à ce que la façade sud de l'église soit construite en priorité. En plus de nous fournir les motivations esthétiques et pratiques de ce choix, la décision prise par les chanoines nous permet de circonscrire avec précision les travaux qui sont entamés dans un premier temps, et ainsi de pouvoir les analyser finement. De plus, cette première phase est marquée par le décès tragique de Paul de Richelle en 1541, ainsi que par l'implication dans le chantier d'une des personnalités majeures du milieu de la construction en vallée mosane. Cette communication aura donc pour but de mettre en lumière le déroulement du chantier, d'en présenter les acteurs majeurs et de mettre au jour les nombreux changements qui se sont produits dans l'intervalle de ces quatre années. En mettant en relation les données archivistiques, dont la plupart sont inédites, avec les données acquises grâce à l'étude du bâti, nous analyserons l'impact de l'ensemble de ces éléments, tant sur l'organisation du chantier que sur les choix formels et esthétiques. [less ▲]

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Peer Reviewed
See detailUHPLC-ESI-MS/MS quantitation of natural estrogens in aqueous matrices as pyridine-3-sulfonyl derivatives
Glineur, Alex ULiege; 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 ▲]

Detailed reference viewed: 74 (26 ULiège)
Peer Reviewed
See detailLa comparaison en Belgique
Delville, Michel ULiege

Conference (2017, June 22)

Detailed reference viewed: 18 (1 ULiège)
See detailSeasonal Transport in Mars’ Mesosphere revealed by Nitric Oxide Nightglow
Stiepen, Arnaud ULiege

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 ▲]

Detailed reference viewed: 15 (1 ULiège)
See detailConclusions of the 6th European Drying Conference
Léonard, Angélique ULiege

Conference (2017, June 21)

Detailed reference viewed: 26 (1 ULiège)
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See detailL’art de gouverner les régions par les finances publiques
Piron, Damien ULiege

Conference (2017, June 21)

Detailed reference viewed: 27 (4 ULiège)
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See detailImpact of conditioning on sludge internal structure evolution during drying
Fraikin, Laurent ULiege; Pambou, Yvon Bert; Salmon, Thierry ULiege et al

Conference (2017, June 20)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimiting by external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

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

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 detailCharacterisation of Luvisol compaction under two different tillage systems and field traffic zones by assessing soil mechanical properties
Taguem Ngoualadjio, Eric Martial ULiege; Destain, Marie-France ULiege; ROISIN, Christian et al

Conference (2017, June 20)

Compaction of arable soils is a consequence of tillage systems and agricultural machinery traffic year after year. Its negative effects on crop production and on the environment have been put into ... [more ▼]

Compaction of arable soils is a consequence of tillage systems and agricultural machinery traffic year after year. Its negative effects on crop production and on the environment have been put into evidence by several studies. However, soil compaction is a complex phenomenon and the understanding of the involved mechanisms related to agricultural practices still remains limited. This contribution aims to study the influence of the interaction between traffic intensity and tillage system on soil compaction. Soil samples were taken from topsoil (0.07-0.25 m), plough pan (0.30-0.35 m) and subsoil (0.35 – 0.52 m), on plots under long-term reduced tillage (RT) and conventional tillage (CT). For each tillage system, intensive traffic zones (IT) and non-intensive traffic zones (NT) were considered. Swelling index (Cs), compression index (Cc), precompression stress (Pc) obtained by oedometer test, porosity (n) and water content obtained by gravimetric determination were chosen to characterise the soil mechanical properties. An analysis of covariance (ANCOVA) was performed to study the effect of the depth, the tillage and the traffic intensity on the variables measured, with the water content as covariable. The results show that, after ten years of reconversion from CT to RT, the plough pan is still present in RT and its compaction appears as important as in CT ( nRT-30cm = 36.9% , nCT-30cm = 38.0%, p-value = 0.098). In subsoil, the compression index was high in CT, as well as in RT (CcRT = 0.150 kPa-1, CcCT = 0.148 kPa-1, p-value = 0.617), involving that this layer remains susceptible to compaction under heavy loads. Moreover, the mean value of the precompression stress (meanPc = 92±34 kPa) remains lower than stresses induced by heavy machines such as beet harvesters. The results also show that the presence of two traffic zones induces a spatial heterogeneity in the field (CcIT = 0.138 kPa-1; CcNT = 0.154 kPa-1, p-value = 0.031). These main results could be used in computational modelling to develop decision support systems to mitigate the effects of soil compaction. [less ▲]

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Peer Reviewed
See detailOptimization of an electrophoretic approach for the screening and the development of new antithrombotic drugs
Farcas, Elena ULiege; Bouckaert, Charlotte; Servais, Anne-Catherine ULiege et al

Conference (2017, June 20)

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations ... [more ▼]

The discovery of lead compounds that can modulate the activity of a biological target is essential to provide efficient pharmacological tools and to serve as starting points for new drug generations. Fragment-based drug discovery (FBDD) approach is an attractive tool for the identification of new selective inhibitors of a target of interest, but its success largely depends on the ability to develop screening bioassays capable to detect and gauge weak affinity binders. To achieve this goal, we investigated capillary electrophoresis (CE) for identifying and ranking fragments from an initial library. Indeed, due to its ability to evaluate weak interactions, CE seems to be promising for fragment-based screening. This technique is a powerful analytical tool with a unique separation mechanism, speed, efficiency and versatility. Its main advantages are low protein consumption, higher throughput compared to NMR and X-ray crystallography and the fact that screening can be carried out using native protein in physiological solution without the need of immobilization. We developed a proof of concept study on thrombin, a serine protease implicated in the coagulation cascade using affinity capillary electrophoresis (ACE) for ranking fragments from an initial library. For this study, we followed a probe ligand, benzamidine, and we investigated interactions with the target by monitoring the changes of its electrophoretic mobility upon binding. The first step of this study consisted in the optimization of the experimental conditions suitable for the CE method (target and probe ligand concentrations, separation buffer composition, voltage, separation effective length, target partial filling…). Then, numerous thrombin inhibitors with a wide range of inhibitory potency (i.e. Ki 200 µM – 5 nM) were tested to validate our system demonstrating the possibility to fish binders in the optimized conditions. We also checked the absence of non-specific binding with the target using the inactivated enzyme at the binding site. It is noteworthy that in this operating system (ACE assay), binding occurs in free solution using physiological buffers, thus preventing artifacts that may result from target immobilization, which is a requirement for some techniques such as SPR. [less ▲]

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

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 detailAltération de la mémoire à court terme dans la dyscalculie : un peu d’ordre
Attout, Lucie ULiege

Conference (2017, June 19)

Il semble plutôt évident que lorsque nous réalisons une opération arithmétique nous devons maintenir de manière temporaire le premier opérande en vue de l’utiliser ultérieurement ou encore maintenir ... [more ▼]

Il semble plutôt évident que lorsque nous réalisons une opération arithmétique nous devons maintenir de manière temporaire le premier opérande en vue de l’utiliser ultérieurement ou encore maintenir pendant un court laps de temps le résultat intermédiaire d’un calcul complexe. De la même façon, dans le comptage verbal, il est nécessaire de maintenir temporairement l’élément qui vient d’être compté afin de pouvoir déterminer l’élément suivant. Alors que la plupart des études s’accordent pour montrer un déficit de l’administrateur central chez des enfants présentant un trouble spécifique des apprentissages en mathématiques, l’altération de la mémoire à court terme (MCT) verbale et visuo-spatiale reste beaucoup plus discutée. Néanmoins, la plupart des recherches ayant exploré le lien entre MCT et dyscalculie développementale ne tiennent pas compte des récentes études comportementales, en neuroimagerie et des modélisations de la MCT distinguant le traitement de l’information « item » et « ordre » en MCT. Nous présenterons donc une série d’études dans le développement normal et atypique démontrant l’importance du traitement de l’ordre sériel en MCT dans le développement des habiletés mathématiques. Enfin, nous discuterons de la pertinence de la prise en charge des composants d’ordre sériel en MCT dans les troubles d’apprentissage des habiletés mathématiques. [less ▲]

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See detailConvective drying : experimental campaign and numerical modelling
Hubert, Julien ULiege; Plougonven, Erwan ULiege; Léonard, Angélique ULiege et al

Conference (2017, June 19)

Detailed reference viewed: 18 (5 ULiège)
Peer Reviewed
See detailChromatographic analysis of alkaloids in Aconitum pollen : towards new insights in plant protection mechanisms
Vanderplanck, Maryse ULiege; Glauser, Gaëtan; Tyteca, Eva ULiege 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 ▲]

Detailed reference viewed: 60 (1 ULiège)
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See detailENMG du pied (atelier)
WANG, François-Charles ULiege

Conference (2017, June 17)

Detailed reference viewed: 18 (1 ULiège)
Full Text
See detailGeneralized Pascal triangles for binomial coefficients of finite words
Stipulanti, Manon ULiege

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 ▲]

Detailed reference viewed: 21 (6 ULiège)
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See detailFirst Characterization of the Volatile Organic Compounds Emitted by Banana Plants (Musa sp.)
Berhal, Chadi ULiege; De Clerck, Caroline ULiege; LEVICEK, Carolina et al

Conference (2017, June 16)

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

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

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

Conference (2017, June 16)

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

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

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Peer Reviewed
See detailNCA independence in the context of EU Regulation 1/2003: time to take incongruent accountability realities (more) seriously?
Van Cleynenbreugel, Pieter ULiege

Conference (2017, June 16)

This paper argues that the Commission’s reform suggestions aimed at streamlining NCAs into independent administrative agencies appear to neglect this variety of accountability mechanisms underlying ... [more ▼]

This paper argues that the Commission’s reform suggestions aimed at streamlining NCAs into independent administrative agencies appear to neglect this variety of accountability mechanisms underlying current NCA institutional organisation and functioning. Given that those mechanisms each harbour incongruent expectations regarding the organisation and functioning of independent NCAs, failure to acknowledge such incongruence may in practice lead to less effective competition law enforcement. The purpose of this paper is therefore to uncover the different NCA independence perspectives underlying those accountability mechanisms and to look for legally sound ways to make them converge when designing or upgrading NCA independence in the context of the Regulation 1/2003 reform. [less ▲]

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Peer Reviewed
See detailRelevance of early stretching in overhead athletes
Schwartz, Cédric ULiege; Tubez, François ULiege; Croisier, Jean-Louis ULiege 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 detailElaboration of an aqueous sol-gel method for the synthesis of g-Al2O3 supports
Lambert, Stéphanie ULiege

Conference (2017, June 16)

Detailed reference viewed: 16 (4 ULiège)
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Peer Reviewed
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 ULiege; Motta, Lucie ULiege

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 ULiege

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

Conference (2017, June 15)

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

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

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See detailConcurrent ultraviolet and infrared observations of the north Jovian aurora during Juno’s first perijove
Gérard, Jean-Claude ULiege; Bonfond, Bertrand ULiege; Gladstone, G.R. et al

Conference (2017, June 15)

The UltraViolet Spectrograph (UVS) and the Jupiter InfraRed Auroral Mapper (JIRAM) observed the polar aurora during the perijove phase of the first Juno orbit (PJ1) on 27 August 2016. The UVS passband ... [more ▼]

The UltraViolet Spectrograph (UVS) and the Jupiter InfraRed Auroral Mapper (JIRAM) observed the polar aurora during the perijove phase of the first Juno orbit (PJ1) on 27 August 2016. The UVS passband includes H2 bands that are directly excited by collisions of auroral electrons with H2. The JIRAM L-band imager includes some of the brightest H3+ features between 3.3 and 3.6 μ m. The intensity if this IR emission depends on both the column density of H3+ and the temperature in the emitting region. A series of spatial scans obtained every 30 s is used to build up images of the polar regions. JIRAM’s spatial resolution was about 100 km/pixel during most of the observations reported here while UVS has a substantially lower resolution (about 250 km/pixel). Concurrent observations were obtained during about 70 min in the north. We present a set of simultaneous ultraviolet and infrared images and point out similarities and di ff erences in their morphology and brightness distribution. The time evolution in the two spectral domains will be described and interpreted in terms of energy of the auroral electrons, time history of the precipitation and lifetime of the H3+ ions. Ultraviolet color ratio maps visualize the spatial distribution of the characteristic energy of the primary auroral electrons. Other supporting information is provided by the H3+ temperatures and column density maps derived from the analysis of JIRAM spectra covering the 2-5 μm interval. [less ▲]

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See detailThe Auroral Dynamic Duo - Jupiter's Independent Pulsating X-ray Hot Spots
Dunn, William; Branduardi-Raymont, Graziella; Ray, Licia et al

Conference (2017, June 15)

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See detailAntifungigrammes: méthodologies et interprétation
Hayette, Marie-Pierre ULiege

Conference (2017, June 15)

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See detailJuno-UVS observation of the Io footprint during eclipse
Hue, V.; Gladstone; Greathouse et al

Conference (2017, June 15)

The Juno mission offers a unique opportunity to study Jupiter, from its inner structure to its magnetospheric environment. Juno-UVS is a UV spectrograph with a bandpass of 70<lambda<205 mn, designed to ... [more ▼]

The Juno mission offers a unique opportunity to study Jupiter, from its inner structure to its magnetospheric environment. Juno-UVS is a UV spectrograph with a bandpass of 70<lambda<205 mn, designed to characterize Jupiter’s UV emissions. One of the main feature of UVS is its scan mirror, which allows targeting specific UV features that are located +/- 30 ̊ perpendicular to the Juno spin plane. Juno provides a unique vantage point in Jupiter’s system to perform observations otherwise not possible from Earth. During Perijove 3 (PJ time: 11 December 2016 at 17:04 UTC), Io went into eclipse on Dec. 11th from 17:38:43 to 19:52:25 UTC. At that time, Juno was flying over the South Pole and observed the Io footprint from 17:50 to 22:04, with nearly continuous time coverage. Since Juno is spinning at 2 rpm, the Io footprint was observed once every 30 sec. The atmosphere of Io is mostly composed of SO2, with a small contribution of SO, S2, and NaCl. Whether its atmosphere is sublimation driven or supported by the volcanic activity is being controversially debated over decades. Studying the response of Io’s footprint brightness as it enters and leaves eclipse provides a novel method to probe its atmospheric response to a diminution of the solar flux. We will present the observations of this event and how the interaction strength of the interaction between Io’s ionosphere and the magnetosphere of Jupiter evolve during the eclipse. [less ▲]

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See detailJuno, Hubble and James Webb observing Jupiter’s aurora
Grodent, Denis ULiege; Bonfond, Bertrand ULiege; Yao, Zhonghua ULiege et al

Conference (2017, June 15)

Hubble Space Telescope (HST) observations of Jupiter’s aurora, supporting the Juno mission, started on 30 Nov 2016. So far, they successfully covered orbits PJ03 to PJ06. After PJ07 in July 2017, the HST ... [more ▼]

Hubble Space Telescope (HST) observations of Jupiter’s aurora, supporting the Juno mission, started on 30 Nov 2016. So far, they successfully covered orbits PJ03 to PJ06. After PJ07 in July 2017, the HST campaign will be interrupted by a solar avoidance period, preventing any observations from late August to the end of December 2017 (PJ08 to PJ10). The campaign will resume with PJ11 and continue until the end of HST cycle 25 (PJ15). Here, we present a brief summary of the HST data that has been acquired so far. It shows a broad range of auroral morphologies, suggesting that the Juno mission is sampling di ff erent facets of Jupiter’s magnetospheric activity. One should keep in mind that HST will not last forever. We should be ready to switch to the James Webb Telescope and take advantage of the overlap between the HST and JWST missions to prepare a smooth transition. The numerous infrared observations of Jupiter’s aurora obtained from ground based telescopes during Juno and obviously with Juno-JIRAM demonstrate that we can expect much from the tremendous performances of the JWST NIRCam and NIRSpec instruments. [less ▲]

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

Conference (2017, June 14)

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

Conference (2017, June 14)

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

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

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See detailPFEM-FEM coupling for fluid-structure interaction problems involving free surfaces and large solid deformations
Cerquaglia, Marco Lucio ULiege; Boman, Romain ULiege; Deliège, Geoffrey ULiege et al

Conference (2017, June 14)

The present work focuses on the solution of fluid-structure interaction problems involving free surfaces and deformable structures. Free-surface flows are often encountered in reality, but the numerical ... [more ▼]

The present work focuses on the solution of fluid-structure interaction problems involving free surfaces and deformable structures. Free-surface flows are often encountered in reality, but the numerical solution of such problems remains a challenge, especially when the flow interacts with some flexible structure. The Particle Finite Element Method (PFEM) is nowadays a well-established Lagrangian method for the study of free-surface flows. The key feature of this method is the continuous remeshing of the computational domain through an efficient Delaunay triangulation, based on which the equations are solved using classical Finite Elements. In this work, the PFEM is coupled to Metafor, an in-house non-linear Finite Element solver, through an original partitioned strategy, based on block Gauss-Seidel iterations with dynamic relaxation. The main advantages of using a partitioned approach are that independent formulations can be employed for the fluid and the solid domains, and that the capabilities of already existing codes can be exploited at their best. In particular, in the problems proposed in this work, the solid structures can undergo very large deformations, and complex material laws, including plasticity for instance, can be easily taken into account. The techniques developed in this work are assessed through many examples, ranging from civil engineering problems, such as a dam break against a deformable obstacle, to aerospace applications, such a bird strike. Results are compared to those available in the literature, whenever possible. [less ▲]

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See detailLegal presumptions of fault in the wake of the transposition of Directive 2014/104/EU
Van Cleynenbreugel, Pieter ULiege

Conference (2017, June 14)

This paper looks at the role played by legal presumptions in the transposition of the directive on damages and whether this differs from the use of legal presumptions in other contexts of EU competition ... [more ▼]

This paper looks at the role played by legal presumptions in the transposition of the directive on damages and whether this differs from the use of legal presumptions in other contexts of EU competition law enforcement. [less ▲]

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See detailAn Overview of Juno-UVS Observations of Jupiter’s Auroras through Perijove 6
Gladstone, G. R.; Versteeg, M. H.; Greathouse, T. K. et al

Conference (2017, June 14)

Currently, Juno’s Ultraviolet Spectrograph (UVS) has observed the Jovian aurora during five perijove passes. On each pass, UVS observes Jupiter for 10 hours centered on closest approach in a series of ... [more ▼]

Currently, Juno’s Ultraviolet Spectrograph (UVS) has observed the Jovian aurora during five perijove passes. On each pass, UVS observes Jupiter for 10 hours centered on closest approach in a series of swaths, with one swath per 30s spin of the Juno spacecraft. During this time the range to the aurora drops from 6 RJ to 0.3 RJ or less in the north (and reverses this in the south), so that spatial resolution and coverage change dramatically. The UVS scan mirror is used to target di ff erent features, as the auroral regions are generally much larger than UVS’s 7-degree long slit can accommodate in a single swath. Typically, the scan mirror position is changed every 2 -5 Juno spins, to track specific targets or just raster across the entire auroral region. Since UVS only observes any particular location for 17 ms/swath, the series of swaths provide snapshots of ultraviolet auroral brightness and color. A variety of forms and activity levels are represented in this data set, and many have been described before with HST observations, but are seen here with higher spatial resolution. One interesting result is that in false color images (where RGB colors are assigned to long, medium, and short UV wavelengths, respectively), the emission morphology often alternates red and blue, in a way similar to patterns expected of large scale current systems. Further results which emerge as the UVS data are compared with data from the other Juno auroral instruments will also be presented. [less ▲]

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See detailParticle energization and structuring of Jupiter’s main auroral oval as diagnosed with Juno measurements of (>30 keV) energetic particles
Mauk, Barry; Haggerty, Dennis; Paranicas, Chris et al

Conference (2017, June 14)

Juno polar low-altitude energetic particle observations indicate that the most intense emissions from Jupiter’s main auroral oval are caused by the impingement onto the atmosphere of relatively flat ... [more ▼]

Juno polar low-altitude energetic particle observations indicate that the most intense emissions from Jupiter’s main auroral oval are caused by the impingement onto the atmosphere of relatively flat, energy-monotonic electron distributions, often extending to energies >1 MeV. They can be associated with bi-directional angular beaming with upward fluxes greater than the downward fluxes. Downward fluxes of >800 mW/m^2 have been observed. However, when viewed in high time resolution ( 1.0s) these distributions are sometimes (3 of 8)) intermixed with >50keV downward accelerated electron distributions with the classic inverted-V configuration, indicative of steady magnetic field-aligned electric fields. The highest downward energy peak observed so far is 400 keV. The inverted-V energy distributions lack the high energy tails observed in adjacent regions, and thus, contrary to what is observed at Earth, the associated downward energy fluxes are generally lower than the downward energy fluxes associated with the more intense energy-monotonic distributions. The relationship between these two modes of auroral particle energization is unclear. Do the classic auroral processes that create inverted-V distributions become so powerful that instabilities are stimulated that cause stochastic energization to turn on and dominate, or do these two different forms of auroral acceleration represent distinctly different processes? These and other questions are explored. [less ▲]

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

Conference (2017, June 13)

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

Conference (2017, June 13)

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

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

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