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See detailHybridation, intergénéricité et ironie dans “Arsène Schrauwen” d’Olivier Schrauwen
Crucifix, Benoît ULg; Meesters, Gert

in Neuvième art 2.0. (2016)

« La vraie vie, c’est ce qui se passe dans la tête quand on fait la vaisselle », ou « J’ai souvent une idée [de ce à quoi ressemblera ma prochaine histoire], mais généralement mon subconscient a d’autres ... [more ▼]

« La vraie vie, c’est ce qui se passe dans la tête quand on fait la vaisselle », ou « J’ai souvent une idée [de ce à quoi ressemblera ma prochaine histoire], mais généralement mon subconscient a d’autres projets ». Ces citations, tirées d’un récent entretien, sont typiques de la posture d’Olivier Schrauwen et indiquent directement qu’une histoire sur le Congo belge, dans ses mains, ressemblera à toute autre chose que les récits (post)coloniaux auxquels la bande dessinée s’est habituée. Paru en français en 2015 à L’Association, Arsène Schrauwen fait le récit halluciné du voyage au Congo qu’aurait effectué, comme le titre semble l’induire, le grand-père de l’auteur. En partant d’un contexte de production où la bande dessinée documentaire et autobiographique sont désormais bien ancrés, nous nous pencherons sur la façon dont Arsène Schrauwen se distingue de telles approches, souvent par l’absurde et l’ironie, mais aussi en invoquant des thèmes et motifs typiques des genres populaires qui ont dominés l’histoire de la bande dessinée. L’ouvrage de Schrauwen revendique ainsi une portée auto-réflexive qui s’étend d’autant plus à une réflexion comique sur le « langage » de la bande dessinée, un jeu qui sert le propos du livre à des fins plus profondes qu’il ne pourrait paraître. [less ▲]

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See detailLe contrat de travail et la prescription : cas particuliers
Cordier, Quentin ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2016)

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See detailOn the Variable Dilatancy Angle in Rocks Around Underground Galleries
Salehnia, Fatemeh ULg; Collin, Frédéric ULg; Charlier, Robert ULg

in Rock Mechanics & Rock Engineering (2016)

Correct estimation of the dilatant behavior of a rock has an essential role in a realistic numerical simulation of the fracturing threshold during the rock deformation process and its post-failure ... [more ▼]

Correct estimation of the dilatant behavior of a rock has an essential role in a realistic numerical simulation of the fracturing threshold during the rock deformation process and its post-failure response, based on experimental and field observations. This importance has been poorly treated in most of the numerical analyses dealing with the rock engineering common problems such as deep excavations. The dilatancy angle as a commonly used parameter for describing the dilatation response of a rock is mostly simplified to be a constant value. Contrarily, a literature review declares the inadequacy of this approach in those rock mechanics applications. In the present paper, a new formula for considering the variable dilatancy angle is presented which relates this parameter to the plastic shear strain in the course of a loading procedure. It is aimed at characterizing an evolution of the dilatant or contracting volumetric response of a rock as well as giving the possibility to simulate a dilatant/contracting transitional behavior. The model is applied to simulate the development of strain localization, in shear band mode, within the inevitable excavation damaged zone created around an underground opening in rock. It is illustrated that using the model of variable dilatancy angle in a deep excavation modeling could help to better reproduce the fractures development around the opening in the course of tunneling. [less ▲]

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See detail40 years of observations of atmospheric methane from a remote European site
Bader, Whitney ULg

Scientific conference (2016, November)

Observation of solar radiation in the infrared have been performed since the mid-fifties at the International Scientific Station of the Jungfraujoch (ISSJ, Swiss Alps, 46.5°N, 8.0°E, 3580 m a.s.l.), in ... [more ▼]

Observation of solar radiation in the infrared have been performed since the mid-fifties at the International Scientific Station of the Jungfraujoch (ISSJ, Swiss Alps, 46.5°N, 8.0°E, 3580 m a.s.l.), in the framework of the Network for Detection of Atmospheric Change (NDACC, www.ndacc.org). Systematic monitoring of the chemical composition of the Earth's atmosphere started in 1984 by using two state-of-the‐art Fourier Transform InfraRed (FTIR) instruments, while grating spectrometers were used previously in the early 1950s, and from the mid-1970s onwards, covering 40 years of quasi-continuous solar observations. In this framework, I will discuss optimization of retrieval strategies from infrared solar observations and methane trend analysis. [less ▲]

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See detailThe Green Grid Network and Trading Renewable Energy
Ernst, Damien ULg

Speech/Talk (2016)

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See detailContribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
Oudkerk, Jean-François ULg

Doctoral thesis (2016)

Piston expanders are well suited for small scale power generation (<50kW) using heat engines such as Ericsson engine or Organic Rankine Cycle (ORC) system. Both systems offer the possibility to use ... [more ▼]

Piston expanders are well suited for small scale power generation (<50kW) using heat engines such as Ericsson engine or Organic Rankine Cycle (ORC) system. Both systems offer the possibility to use renewable energy sources and are increasingly considered in light of the economic and environmental context. This thesis aims at contributing to the knowledge and the development of piston expanders by presenting modeling, simulation and experimental investigations. Two types of piston engine models are proposed. The first type (denoted as “detailed”) describes the shaft angle (or time) evolution of the state of the fluid in the control volume limited by the cylinder wall and the piston. The second type of model (denoted as “semi-empirical”) is based on theoretical indicator diagram. A calibration process is proposed and applied with the measurement collected on two different expanders. The detailed model is first used to simulate an Ericsson engine. The simulations allow for the optimization of the pressure ratio, the determination of the ratio between the swept volumes of the expander and the compressor, the computation of the valve timing and the evaluation of the potential performances. The main modifications made to turn an available Internal Combustion Engine (ICE) into an Ericsson engine are described. This prototype is then tested but did not run as expected. The identified reasons are a too high leakage rate, a too large cut-off ratio and a too low expander supply temperature. These three features led to insufficient pressure. Nevertheless, a compressor is used to rise the pressure up to 7 bar in order to test the expander part. This expander shows a maximal isentropic efficiency of 59% at 600 RPM with a pressure ratio of 5. A swash-plate expander integrated into an ORC using R245fa is also investigated in a wide range of operating conditions. Performance maps in terms of pressure ratio and rotational speed are given. Maximal reached isentropic efficiency is 54% at 2500 RPM for a pressure ratio of 10.5. Experimental results obtained on both expanders are analyzed with the same methodology to assess the importance of each source of losses. This methodology is based on the disaggregation of the isentropic efficiency into different factors. Each of these factors represents one source of losses. In-cylinder pressure measurements are performed in order to measure mechanical losses. Leakage effects are simulated with the detailed model. Finally, an Ericsson engine-based m-CHP unit and an ORC-based m-CHP unit using the swash-plate expander are simulated with the validated semi-empirical model. Ericsson engine system shows a 6.5% electrical efficiency while the ORC system shows en efficiency of 8.2%. For both systems, possible improvements are simulated. It is shown, among other things, that the benefit of an increase of the built-in volume is limited by the decrease of the mechanical efficiency. [less ▲]

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See detailUn incunable de l’imagination : "La Conquête du Char de la Gloire" du père jésuite Pierre Le Moyne (1628)
De Marco, Rosa ULg

in Art et artistes dans l’espace haut-marnais (XIVe-début XXe siècles) (2016)

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See detailSatellites à l'appui d'outils d'aide à la décision dans l'agriculture: applications passées et futures
Wellens, Joost ULg

Conference given outside the academic context (2016)

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See detailThe Base of Fabia Fabiana from Acci (Guadix, Granada). A Reassessment
Veymiers, Richard ULg; Gasparini, Valentino

Conference (2016, November)

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See detailEvaluation et gestion des scenarii de dysfonctionnement des barrages-réservoirs en Belgique
Liégeois, Benoît; Pirotton, Michel ULg; Dewals, Benjamin ULg et al

in Sûreté des barrages et enjeux (2016, November)

Belgium has fifteen structures included in the list of large dams of the International Committee on Large Dams. Six are managed by Engie Company, the other nine are owned by the Walloon regional public ... [more ▼]

Belgium has fifteen structures included in the list of large dams of the International Committee on Large Dams. Six are managed by Engie Company, the other nine are owned by the Walloon regional public authority. The Belgian legislator has never enacted specific rules for large dams. However, managers have always been concerned with this issue. They developed procedures and methods that were subject to exchanges of experience with their counterparts, in particular through the Belgian Committee on Large Dams. In this ongoing research of security, the impact of multiple failure scenarios (dam break, quick emptying …) on the people and the environment downstream of dams is a particular focal point. An impact study has been conducted for the main plants. This study is based on a deterministic numerical method. The methodology, the assumptions regarding the failure mode or emptying and the lessons learned from the analyses are presented. These results are an important step in the assessment and the management of risks. Indeed, regulations were recently enacted for the management and the coordination of any activity likely to seriously impact public safety during crisis periods. These rules apply therefore for large dams. In this context, managers have established an emergency plan for each structure. This paper provides a broad overview on the issues of the evaluation and the management of dysfunction risks of Belgian dams, as well as on approaches and collaborations initiated between the private managers and public authority. [less ▲]

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See detailEtre chercheur en Europe aujourd'hui
Halleux, Isabelle ULg

Learning material (2016)

This document is provided as a support for training researchers on their job requirements, seen through the European Charter and Code's angle and the HR Strategy process implemented at ULg. It can be used ... [more ▼]

This document is provided as a support for training researchers on their job requirements, seen through the European Charter and Code's angle and the HR Strategy process implemented at ULg. It can be used in a "train the trainer" context. Duration: 4 hours. A very active participation is expected from participants. This doc présents the findings of the session help on 2016/11/16. [less ▲]

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See detailCartels in the EU: who appeals and who wins?
Gautier, Axel ULg

Conference (2016, November)

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See detailRécupération musculaire après plastie LCA : conséquences sur le retour au sport
Croisier, Jean-Louis ULg; Delvaux, François ULg; Kaux, Jean-François ULg et al

in Abstract Book des XVIIIèmes RENCONTRES ISOCINETIQUES MEDIMEX / ROTSCHILD (2016, November)

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See detailLoadbearing capacity criteria in fire resistance testing
Dumont, Fabien ULg; Wellens, Eric ULg; Gernay, Thomas ULg et al

in Materials and Structures (2016), 49(11), 4565-4581

The European system for fire testing and classification of loadbearing building elements lacks consistency because the two standards that have to be applied prescribe different criteria for assessing the ... [more ▼]

The European system for fire testing and classification of loadbearing building elements lacks consistency because the two standards that have to be applied prescribe different criteria for assessing the loadbearing performance. This article analyzes the implications of the present conflict between the standard for testing and the standard for classification. The prescribed criteria for loadbearing performance are related to the exceedance of deflection and rate of deflection thresholds. A database of 46 fire resistance tests performed at the University of Liege is collected that contains the time at which these thresholds are reached in fire tests with different typologies of elements (walls, floors, columns and beams). Then, the loadbearing performance (and hence the fire resistance rating) can be derived according to the two standards. The evolutions of deflection and rate of deflection during the tests are also analyzed to gain a better understanding of the adequacy of the standards. The selection of one or the other standard affects the time at which “failure” is deemed to occur in fire tests. Statistically speaking, the difference in terms of failure time that results from using one or the other standard has a 25% probability to exceed 10%. In certain cases, this results in a difference in fire resistance rating; this was observed for 3 of the analyzed tests. The apparent contradiction in two codes in application has potential practical implications and therefore needs to be solved. The article suggests some guidelines for defining homogenized and consistent criteria. [less ▲]

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See detailWeak performance of glomerular filtration rate equations in stable lung/liver transplant recipients compared to 51Cr-EDTA clearance.
Navaux, Emilie; Gustot, Thierry; Racape, Judith et al

Conference (2016, November)

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See detailGlomerular filtration rate in healthy living potential kidney donors: a meta-analysis.
Pottel, H; Hoste; DELANAYE, Pierre ULg

Poster (2016, November)

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See detailComparisons of estimated GFR and Cockcroft Gault equations: calibration against relative risk for all-cause mortality.
Warnock, DG; van den Brand, JAJG; DELANAYE, Pierre ULg et al

Poster (2016, November)

Detailed reference viewed: 9 (1 ULg)