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See detailPower to the People: Les Rôles des Coopératives d’Énergie Renouvelable dans la Transition Énergétique
Bauwens, Thomas ULg

Conference given outside the academic context (2015)

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See detailImpact of roughness and circularity-defect on bridge cables stability
Benidir, Adel; Flamand, Olivier; Gaillet, Laurent et al

in Journal of Wind Engineering & Industrial Aerodynamics (2015), 137

The stay cables on cable-stayed bridges have been the subject of considerable research in order to understand the origins of the dry galloping phenomenon. Surface irregularity is one of the last ... [more ▼]

The stay cables on cable-stayed bridges have been the subject of considerable research in order to understand the origins of the dry galloping phenomenon. Surface irregularity is one of the last parameters that have not been thoroughly examined. This paper focuses on static wind tunnel tests on original High Density Polyethylene cable covers in a range of Reynolds numbers from the sub-critical regime to the critical, corresponding to values ranging from Re = 9.6x104 to Re = 3.3x105. The experiment consists in testing cable covers of various diameters in order to investigate the effect of surface irregularity (roughness and circularity defect) on the mechanism of dry galloping excitation. Previous studies reported that dry galloping is caused by the appearance of a negative pressure bubble on one side of the circular cylinder at the critical Reynolds number range, leading to a rapid drop in the drag coefficient and the appearance of a non-negligible lift force. The results of the present investigation demonstrate that there is a clear correlation between the single bubble pressure pattern and the circularity defect along the tube. They further show that surface roughness has little effect on the location of the bubble. The paper also treats the spatial and temporal correlation of the instantaneous pressure pattern along the tube with respect to the circularity defect. [less ▲]

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See detailWasabi, de Alan Pauls. Una lectura alegórica en clave autoficcional.
Vanden Berghe, Kristine ULg

in Pasavento. Revista de Estudios Hispánicos. (2015)

Se lee Wasabi (Alan Pauls, 1994, 2005) como una novela neofantástica emparentada con La metamorfosis de Kafka y ciertos cuentos de Cortázar. Asimismo, se procede a una lectura de la novela en clave ... [more ▼]

Se lee Wasabi (Alan Pauls, 1994, 2005) como una novela neofantástica emparentada con La metamorfosis de Kafka y ciertos cuentos de Cortázar. Asimismo, se procede a una lectura de la novela en clave alegórica, atendiendo a una serie de metáforas (quiste, narcolepsias, wasabi) que aluden a las relaciones entre literatura y vida. En este sentido, se aborda el texto como una alegoría primero de la autoficción y luego de la creación literaria en general. A esta lectura alegórica la apoyan la recurrencia de la cifra siete en la novela así como la relación intertitular que esta tiene con Fils, novela autoficcional que Serge Doubrovsky escribiera en 1977. [less ▲]

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See detailImportance et rôle de l’investissement…
Choffray, Jean-Marie ULg

E-print/Working paper (2015)

Quelques observations et réflexions en réponse à une question qui m’est souvent posée sur l’importance et le rôle des investisseurs. Ces « Charognards », particulièrement visés au cours des périodes de ... [more ▼]

Quelques observations et réflexions en réponse à une question qui m’est souvent posée sur l’importance et le rôle des investisseurs. Ces « Charognards », particulièrement visés au cours des périodes de tension géopolitique, de populisme ou de débauche monétaire, semblables à celle que nous vivons aujourd’hui. Ma réponse en peu de mots : les investisseurs sont des défenseurs de la valeur du travail par temps calme et des vigies dans la tempête ! [less ▲]

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See detailStochastic modelling of reservoir sedimentation in a semi-arid watershed
Adam, Nicolas; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Water Resources Management (2015), 29(3), 785-800

Sedimentation in large reservoirs is a major concern in semi-arid regions characterized by severe seasonal water scarcity. As a contribution to improved sediment management, this study analyses the real ... [more ▼]

Sedimentation in large reservoirs is a major concern in semi-arid regions characterized by severe seasonal water scarcity. As a contribution to improved sediment management, this study analyses the real case of the reservoir of Sidi Yacoub in the north of Algeria. First, a dynamic model of the reservoir was set up and used to estimate past water and sediment inflows (period 1990-2010) based on data recorded by the dam operator and measurements at a gauging station located downstream of the reservoir. Second, in a stochastic framework using the statistical characteristics of inflow and outflow discharges, a projection of future sedimentation was performed until 2030, assuming stationarity of the statistical distributions. Third, the model was used to investigate the influence of possible climate change and to quantify the positive effects of soil conservation measures upstream. [less ▲]

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See detailRole of the progesterone receptor in the development of sexual behavior in female mice
Desroziers, Elodie ULg; Brock, Olivier; Baum, M.J. et al

Poster (2015, February)

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See detailLittérature et sémiotique: histoire et épistémologie
Provenzano, François ULg; Bertrand, Jean-Pierre ULg; Stienon, Valérie ULg

in Signata. Annales des Sémiotiques = Annals of Semiotics (2015), 5(2014), 384

La question des liens entre sémiotique et littérature amène à poser un regard rétrospectif sur une période qui paraît aujourd’hui révolue. L’émergence de la sémiotique comme discipline institutionnalisée ... [more ▼]

La question des liens entre sémiotique et littérature amène à poser un regard rétrospectif sur une période qui paraît aujourd’hui révolue. L’émergence de la sémiotique comme discipline institutionnalisée est en effet contemporaine d’un profond changement de paradigme dans les approches du texte littéraire. Au cours de la décennie 1960, la rencontre entre sémiotique et littérature produit, en un temps très bref, un nombre considérable de concepts et d’instruments d’analyse, qui vont de la théorie du dialogisme et de la polyphonie à la sémanalyse en passant par la narratologie et la sémantique structurale. L'objectif de ce dossier est de saisir cette rencontre dans la perspective d’une histoire des idées, en éclairant ce qui, dans la conjoncture des années 1960, a pu favoriser la convergence, avant de la rendre caduque ou obsolète. Une place est également réservée aux témoignages pour laisser entendre, dans un souci d'historicisation, la voix d'acteurs importants de ces années sémio-littéraires: Philippe Hamon, le groupe Mu, Marc Angenot [less ▲]

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See detailStandardisation of milk mid-infrared spectra from a European dairy network
Grelet, Clément ULg; Fernandez Pierna, Juan Antonio; Dardenne, Pierre et al

in Journal of Dairy Science (2015), 98

http://www.journalofdairyscience.org/article/S0022-0302(15)00091-0/abstract

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See detailHow to Assess Data Availability, Accessibility and Format for Risk Analysis?
Humblet, Marie-France ULg; Vandeputte, Sébastien; Mignot, Clémence et al

in Transboundary and Emerging Diseases (2015), doi: 10.1111/tbed.12328

Risk assessments are mostly carried out based on available data, which do not reflect all data theoretically required by experts to answer them. This study aimed at developing a methodology to assess data ... [more ▼]

Risk assessments are mostly carried out based on available data, which do not reflect all data theoretically required by experts to answer them. This study aimed at developing a methodology to assess data availability, accessibility and format, based on a scoring system and focusing on two diseases: Venezuelan equine encephalomyelitis (VEE), still exotic to Europe, and alveolar echinococcosis, caused by Echinococcus multilocularis (EM), endemic in several Member States (MSs). After reviewing 36 opinions of the EFSA-AHAW Panel on risk assessment of animal health questions, a generic list of needed data was elaborated. The methodology consisted, first, in implementing a direct and an indirect survey to collect the data needed for both case studies: the direct survey consisted in a questionnaire sent to contact points of three European MSs (Belgium, France and the Netherlands), and the organization of a workshop gathering experts on both diseases. The indirect survey, focusing on the three MSs involved in the direct survey plus Spain, relied on web searches. Secondly, a scoring system with reference to data availability, accessibility and format was elaborated, to, finally, compare both diseases and data between MSs. The accessibility of data was generally related to their availability. Web searches resulted in more data available for VEE compared to EM, despite its current exotic status in the European Union. Hypertext markup language and portable document files were the main formats of available data. Data availability, accessibility and format should be improved for research scientists/assessors. The format of data plays a key role in the feasibility and rapidness of data management and analysis, through a prompt compilation, combination and aggregation in working databases. Harmonization of data collection process is encouraged, according to standardized procedures, to provide useful and reliable data, both at the national and the international levels for both animal and human health; it would allow assessing data gaps through comparative studies. The present methodology is a good way of assessing the relevance of data for risk assessment, as it allows integrating the uncertainty linked to the quality of data used. Such an approach could be described as transparent and traceable and should be performed systematically. [less ▲]

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See detailDoc'Data: mesure de la persévérance au doctorat à l'Université de Liège
Aerts, Stéphanie ULg; Haesbroeck, Gentiane ULg; Schyns, Michael ULg

Report (2015)

Le Conseil du Doctorat a parmi ses missions celle d’accompagner les doctorants dans leur parcours et de mettre en place des actions en vue de favoriser la réussite. Cependant, pour réellement mesurer ... [more ▼]

Le Conseil du Doctorat a parmi ses missions celle d’accompagner les doctorants dans leur parcours et de mettre en place des actions en vue de favoriser la réussite. Cependant, pour réellement mesurer l’impact des actions mises en oeuvre dans cette optique, il faut d’abord pouvoir quantifier le taux de réussite. Or, mesurer le taux de réussite dans les études de 3ème cycle n’est pas une démarche évidente. De nombreux raccourcis de raisonnement sont tentants mais mènent à des résultats très variables et incorrects. Le but de ce document est de présenter les difficultés inhérentes au calcul d’un taux de réussite et de proposer quelques procédures appropriées. Dans un premier temps, les chances (ou, d’un point de vue plus formel, les probabilités) de réussite et d'abandon des doctorants sont modélisées en fonction du nombre d’années d’inscription et en tenant compte de caractéristiques du doctorant comme son genre, sa nationalité, son âge au moment de l’inscription, son statut professionnel... L'analyse descriptive et exploratoire est ensuite confirmée par l’application d’une analyse de survie avec risques compétitifs. [less ▲]

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See detailLa cardiomyopathie du cirrhotique : un bref aperçu
MARCHETTA, Stella ULg; DELWAIDE, Jean ULg; LANCELLOTTI, Patrizio ULg

in Revue Médicale de Liège (2015), 2

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See detailRobust impact design of steel and composite building structures: the alternate load path approach
Hoffmann, Nadine; Kuhlmann, Ulrike; Demonceau, Jean-François ULg et al

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

Vulnerability of structures to progressive collapse and mitigation of the effects of local damages are topics widely discussed. The studies worldwide carried out allowed identifying different design ... [more ▼]

Vulnerability of structures to progressive collapse and mitigation of the effects of local damages are topics widely discussed. The studies worldwide carried out allowed identifying different design strategies. However, specific knowledge is still limited and this gap is apparent in codes of practice. A European project focusing on robustness of steel and steel and concrete composite structures regarding the effects of impact recently started combining the 2 methods of residual strength and alternate load path. In the framework of the project activities, the Authors aimed their studies on the redundancy of the structure through slab-beam-systems and ductile joint as well as on the local behaviour of the impacted members. For this analytical, numerical and experimental investigations have been planned and executed. The paper describes the experimental activities related to the investigations on the structural redundancy and presents the preliminary test outcomes. [less ▲]

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See detailRobust impact design of steel and composite building structures
Hoffman, Nadine; Kuhlmann, Ulrike; Demonceau, Jean-François ULg et al

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

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See detailSignes et jouabilité : l’interface comme outil de ludicisation
Barnabé, Fanny ULg

in Interfaces Numériques (2015), 4(1),

As shown by the recent works on the subject (Rao, 2008 ; Simonnot, 2008 ; all papers presented at the symposium Game and playability in the digital age), researchers now seem to agree on the fact that the ... [more ▼]

As shown by the recent works on the subject (Rao, 2008 ; Simonnot, 2008 ; all papers presented at the symposium Game and playability in the digital age), researchers now seem to agree on the fact that the digital has an intrinsic playability (it is “ludogenic” according to Vial, 2012) and that this property is not uninvolved with the current spread of the “gamification” or “ludification” (Genvo, 2011) phenomenons. Following these considerations, this paper aims to examine a specific angle of this privileged relationship between digital and game, namely the fundamental role played by the interfaces (both graphical and physical). We will try to demonstrate through various examples the deeply playable nature (I.e suitable to set off a playful attitude) of the different kinds of interface, but also to examine its causes: is there a structural basis that could explain this affinity with the play? With this aim in mind, theories of game (playful attitude) will be intersected with interface theories in order to demonstrate the existence of many similarities. The hypothesis that guides this work is that this transitional device’s playability owes more to its semiotic nature than to its belonging to digital. Indeed, as a system of signs, the interface has two characteristics that make it fit to generate a playful attitude in the user: the metaphoric distance and the increase of possible actions. [less ▲]

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See detailIncreased tree-growth synchronization of beech (Fagus sylvatica L.) in response to climate change in northwestern Europe
Latte, Nicolas ULg; Lebourgeois, François; Claessens, Hugues ULg

in Dendrochronologia (2015), 33

To better understand how the radial growth of beech (Fagus sylvatica L.) high forests has responded to climate change, we selected 12 sites (137 trees) with optimal growing conditions along a W − E ... [more ▼]

To better understand how the radial growth of beech (Fagus sylvatica L.) high forests has responded to climate change, we selected 12 sites (137 trees) with optimal growing conditions along a W − E altitudinal gradient (67–590 m) in Belgium. We evaluated temporal changes in growth response to climate by using pointer year analysis, moving mean sensitivities (1860–2011), and moving bootstrapped correlation coefficients (1952–2011). The strongest driving climatic variables were identified by using the partial least squares method. The common patterns of growth trends, pointer years, and mean sensitivities among sites provided evidences for the impact of environmental changes operating at a regional scale. The results of growth–climate analysis indicated that these changes were strongly influenced by the climatic conditions of the previous year. The climate sensitivity of beech increased progressively in response to more frequent and intense heat waves and warming-related droughts, especially during recent decades, leading to remarkable inter-site synchronization. The changes were much more pronounced for sites located in lowlands (<300 m). The differences in growth responses along the altitudinal gradient and the consequences of warming for beech growth and physiology are discussed. [less ▲]

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See detailEarly detection of university students in potential difficulty
Hoffait, Anne-Sophie ULg; Schyns, Michael ULg

Conference (2015, February)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by ... [more ▼]

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by early identifying students who have a high probability to face difficulties if nothing is done, the Universities might develop adapted methods to attack the problem with more emphasis where it is more needed and when it is still possible. Thus we want to develop a decision tool able to identify these students to help them. For that, we consider three standard datamining methods: logistic regression, artificial neural networks and decision trees and focus on early detection, i.e. before starting at the University. Then, we suggest to adapt these three methods as well as the classification framework in order to increase the probability of correct identification of the students. In our approach, we do not restrict the classification to two extreme classes, e.g. failure or success, but we create subcategories for different levels of confidence: high risk of failure, risk of failure, expected success or high probability of success. The algorithms are modified accordingly and to give more weight to the class that really matters. Note that this approach remains valid for any other classification problems for which the focus is on some extreme classes; e.g. fraud detection, credit default... Finally, simulations are conducted to measure the performances of the three methods, with and without the suggested adaptation. We check if the factors of success/failure we can identify are similar to those reported in the literature. We also make a ``what-if sensitivity analysis''. The goal is to measure in more depth the impact of some factors and the impact of some solutions, e.g., a complementary training or a reorientation. [less ▲]

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See detailSecreto de confesión
Ceballos Viro, Alvaro ULg

Article for general public (2015)

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