Last 7 days
Bookmark and Share    
Full Text
See detailEvaluation des enseignements par les étudiants :  évaluer pour évoluer
Detroz, Pascal ULiege

Scientific conference (2017, June 29)

Detailed reference viewed: 39 (2 ULiège)
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 ▲]

Detailed reference viewed: 27 (1 ULiège)
Full Text
Peer Reviewed
See detailA Discussion on the Advancement of Blade Tip Timing Data Processing
Kharyton, Vsevolod; Dimitriadis, Grigorios ULiege; Defise, Colin

in Proceedings of the Turbomachinery Technical Conference & Exposition, TURBO EXPO 2017 (2017, June 29)

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration ... [more ▼]

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration specialists. Its advantages include its non-intrusive nature and its capability of being used for long-term monitoring, both in on-line and off-line analysis. However, the main drawback of BTT is frequency aliasing. Frequency aliasing effects in tip timing can be reduced by means of the application of different methods from digital signal analysis that can exploit the non-uniform nature of the data sampled by BTT. This non-uniformity is due to the fact that an optimization of the circumferential distribution of BTT probes is usually required in order to improve the data quality for targeted modes of blade vibration and/or orders of excitation. The BTT data analysis methods considered in this study are the non-uniform Fourier transform, the minimum variance spectrum estimator approach, a multi-channel technique using in-between samples interpolation, the Lombe-Scargle periodogram and an iterative variable threshold procedure. These methods will be applied to measured data representing quite a large scope of events occurring during gas-turbine compressor operation, e.g. synchronous engine order resonance crossing, rotating stall, suspected limit-cycle oscillations. Finally, the frequency estimates obtained from all these methods will be summarized. [less ▲]

Detailed reference viewed: 68 (0 ULiège)
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 ▲]

Detailed reference viewed: 25 (1 ULiège)
Full Text
Peer Reviewed
See detailAssessment of AquaCrop for winter wheat using satellite derived fCover data
Mohamed Sallah, Abdoul-Hamid ULiege; Wellens, Joost ULiege; Tychon, Bernard ULiege et al

in 9th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

Detailed reference viewed: 40 (1 ULiège)
Full Text
Peer Reviewed
See detailPotato monitoring in Belgium with "watchITgrow"
Piccard, Isabelle; Gobin, Anne; Wellens, Joost ULiege et al

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

Detailed reference viewed: 23 (1 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 ▲]

Detailed reference viewed: 10 (1 ULiège)
Peer Reviewed
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 ▲]

Detailed reference viewed: 26 (4 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 ▲]

Detailed reference viewed: 47 (2 ULiège)
Full Text
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: 27 (4 ULiège)
Full Text
Peer Reviewed
See detailDecreasing cloud cover drives the recent mass loss on the Greenland Ice Sheet
Hofer, S.; Tedstone, A.; Fettweis, Xavier ULiege et al

in Science (2017), 3(6),

The Greenland Ice Sheet (GrIS) has been losing mass at an accelerating rate since the mid-1990s. This has been due to both increased ice discharge into the ocean and melting at the surface, with the ... [more ▼]

The Greenland Ice Sheet (GrIS) has been losing mass at an accelerating rate since the mid-1990s. This has been due to both increased ice discharge into the ocean and melting at the surface, with the latter being the dominant contribution. This change in state has been attributed to rising temperatures and a decrease in surface albedo. We show, using satellite data and climate model output, that the abrupt reduction in surface mass balance since about 1995 can be attributed largely to a coincident trend of decreasing summer cloud cover enhancing the melt-albedo feedback. Satellite observations show that, from 1995 to 2009, summer cloud cover decreased by 0.9 ± 0.3% per year. Model output indicates that the GrIS summer melt increases by 27 ± 13 gigatons (Gt) per percent reduction in summer cloud cover, principally because of the impact of increased shortwave radiation over the low albedo ablation zone. The observed reduction in cloud cover is strongly correlated with a state shift in the North Atlantic Oscillation promoting anticyclonic conditions in summer and suggests that the enhanced surface mass loss from the GrIS is driven by synoptic-scale changes in Arctic-wide atmospheric circulation. [less ▲]

Detailed reference viewed: 23 (6 ULiège)
Full Text
See detailAn integrated logistics decision support model for city logistics
Limbourg, Sabine ULiege

Scientific conference (2017, June 28)

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport ... [more ▼]

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport (both forward flows and reverse flows) is clearly growing. But, transport is also responsible for a large share of urban air pollution as well as noise nuisance. Thus, an integrated logistics system to optimize transport network and service design, as well as vehicles routing of a variety of modes has to be developed. The objective is to determine how to efficiently move freight by means of these services and vehicles, while reducing negative environmental impacts. The topic includes research questions related to the demand to be serviced, the type and number of facilities needed to store and consolidate freight, the better utilization of vehicle capacity (fill rate and fewer empty trips: on average, 25% of goods vehicles in Europe run empty) and the reduction of energy consumption. [less ▲]

Detailed reference viewed: 42 (1 ULiège)
Full Text
Peer Reviewed
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: 30 (0 ULiège)
Full Text
See detailHolomorphic cohomological convolution
Dubussy, Christophe ULiege

Poster (2017, June 28)

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holomorphic functions defined on star-eligible subsets of the Riemann sphere. We show how this theory is actually a particular ... [more ▼]

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holomorphic functions defined on star-eligible subsets of the Riemann sphere. We show how this theory is actually a particular case of the holomorphic cohomological convolution, defined in a general way thanks to the integration map on complex Lie groups. [less ▲]

Detailed reference viewed: 35 (12 ULiège)
Full Text
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 (15 ULiège)
Full Text
Peer Reviewed
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: 51 (4 ULiège)