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See detailThe City museum : a concept with multiple interpretations
Postula, Jean-Louis ULg

Conference (2016, January 27)

As early as the second half of the nineteenth century, some major European cities have developed museums to expose their history. This movement has then grown throughout the twentieth century around the ... [more ▼]

As early as the second half of the nineteenth century, some major European cities have developed museums to expose their history. This movement has then grown throughout the twentieth century around the world. At the beginning of the third millennium, the phenomenon is more relevant than ever, as evidenced by numerous projects of creation and renovation of such institutions. Nevertheless, it took a long time before that kind of museums began to be considered as part of a specific museum category, with its own characteristics and challenges. It is only in 1993, at the Museum of London, that representatives of museums devoted to the study of cities met for the very first time, in order “to discuss [their] problems, to develop theories and to promote [their] special place in the museum movement worldwide” (HEBDITCH Max, “Key-note address”, in JOHNSON Nichola (ed.), Reflecting cities, London, 1993, p. 1). The expression “city museum” took shape for this occasion, with the creation at the end of the symposium of a first International Association of City Museums, followed subsequently by other organizations. The purpose of this presentation is to provide an overview of the multiple interpretations and meanings attached to the quite recent concept of “city museum”, examined through its different uses and definitions within the museological literature. The analysis of these speeches will highlight the fact that there are no unanimously established uses of the expression among the specialists. It will also show that, as a museum category, city museum is an object whose identity is still under construction. [less ▲]

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See detailUtiliser les résultats du contrôle laitier pour améliorer son rendement fromager
Colinet, Frédéric ULg; Troch, Thibault ULg

Conference given outside the academic context (2016)

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See detailIn vitro monitoring of human tissue degradation by TD-GC×GC-TOFMS
Stefanuto, Pierre-Hugues ULg; Dubois, Lena ULg; DELPORTE, Géraldine ULg et al

Conference (2016, January 27)

Human rescue dog unit are amongst the most efficient tools to locate cadaver or individuals trapped after a natural disaster. However, the dog training process is long and expensive. Dog trainers are ... [more ▼]

Human rescue dog unit are amongst the most efficient tools to locate cadaver or individuals trapped after a natural disaster. However, the dog training process is long and expensive. Dog trainers are still looking for a better understanding of the dog olfaction matching mechanism to improve their training methods (1). How does the decomposition process differ between organs? Are there specific body parts better suited for dog training? What are the major volatile compounds responsible of the dogs’ match response? In the line of these questions, this project was monitoring the headspace of various human organs during the decomposition process. Five different organs, from five different bodies, were used: heart, lung, liver, kidney, and blood. Each organs were sampled in triplicates and let to decompose in glass jar. Regularly, the headspace of the jar was sampled by dynamic pumping to sorbent tubes that were further be desorbed on a comprehensive two-dimensional gas chromatography system (GC×GC). GC×GC is a powerful analytical tool that allows the resolution of “the smell of death”, i.e. the decomposition odor (2-3). The development of an in vitro approach for decomposition monitoring provided several analytical improvements in the decomposition field. Indeed, the study of dead bodies is always limited in the number of replicates (4). The sampling process developed for this project allows intra and inter corpse comparison with at least triplicates sampling. These comparisons were conducted using advanced chemometric methods (Fisher ratio, PCA, hierarchical analysis…) that will contribute to better understand key parameters of rescue the dog training. References 1. Hoffman et al. FSI (2009) 186, 6-13. 2. Stefanuto et al. CPC (2014) 79, 786-789. 3. Perrault et al. J. Sep. Sci. (2015) 38, 73-80. 4. Stefanuto et al. ABC (2015) 407, 4767-4778 [less ▲]

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See detailEvolution of the palaeoenvironment of the Medjerda delta (Tunisia) and geoarchaeology of the ancient city of Utica
Pleuger, Elisa ULg; Abichou, Hakim; Gadhoum, Ahmed et al

Conference (2016, January 27)

Phoenician Utica remains today largely unknown, as is its role in the Phoenician expansion in the western Mediterranean. Aristotle and Pliny the Elder mention Utica as a maritime and port city and ... [more ▼]

Phoenician Utica remains today largely unknown, as is its role in the Phoenician expansion in the western Mediterranean. Aristotle and Pliny the Elder mention Utica as a maritime and port city and estimate its origin around the 11th c. BC. However, in the present state of research, no archaeological evidence is earlier than the 9th c. BC, and the location of the Phoenician and Roman port infrastructures remains unknown. Today, the ancient city is located on a promontory in the heart of the Medjerda delta, 10 km inland. This project proposes an interdisciplinary effort to understand the Medjerda delta landscape changes during the Holocene. It starts from an archaeological problem and proposes the contribution of geoarchaeology to the understanding of the relationship between ancient societies and their environment. The fluvial palaeoenvironments and sedimentary processes are studied through the mechanical extraction of cores (15-20 m deep) to reach the early Holocene. Selected sediment samples are then studied in laboratory, using different and complementary approaches. The location of port infrastructures will bring initial answers to the question of the foundation of the city. The study of river palaeoenvironments of the Medjerda delta during the Holocene aim at a better understanding of the nature of the settlement, as well as the function of the city of Utica over time. This study will also assess the impact of the ancient city on the environment and understand how the city adapted to the mobility of this Mediterranean delta. Furthermore, the analysis of sedimentary processes causing the filling of the harbour basin will lead to speculation about the causes of the abandonment of the structures and more generally the decline of the city in favor of Carthage. It will also examine whether natural or anthropogenic factors have influenced this deltaic progradation over the centuries. [less ▲]

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See detailA Comparison of Departure Time of Day Formulations
Lurkin, Virginie ULg; Garrow, Laurie; Higgins, Matthew et al

E-print/Working paper (2016)

Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been ... [more ▼]

Airline passengers’ itinerary choices are influenced by many factors including carriers, prices, the number of connections, and departure times. This paper compares three different methods that have been used to model departure time of day preferences. The first is a discrete formulation that uses indicator variables to represent the hour of departure. The next two methods are based on a continuous formulation that uses a series of sine and cosine functions. One assumes departure time preferences over a 24-hour cycle and the other uses shorter cycle lengths that account for fewer departures during certain hours of the day. We compare models using itineraries in the Continental U.S. that are separated by two time zones. Although the discrete formulation fits the data better, the two continuous time of day formulations are preferred as they provide more intuitive predictions and require fewer parameters. Results between the two continuous time of day formulations are similar but differ in how strongly they weight itineraries that depart very early or very late in the day. Based on empirical results, we recommend testing both 24-hour and less than 24-hour cycle lengths for a particular dataset. [less ▲]

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See detailEfficient methods for large-scale time-harmonic wave simulations
Marsic, Nicolas ULg

Doctoral thesis (2016)

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See detailLandslides' mechanism and evolution in the western Rwanda
Draidia, Salah ULg; El Ouahabi, Meriam ULg; Dewitte, Olivier et al

Scientific conference (2016, January 27)

Landslides' mechanism and evolution in the western Rwanda Salah DRAIDIA1,*, Meriam EL OUAHABI1, Olivier DEWITTE2, Nathalie Fagel1, Hans Balder HAVENITH1 1 Institution 1 University of Liège Department of ... [more ▼]

Landslides' mechanism and evolution in the western Rwanda Salah DRAIDIA1,*, Meriam EL OUAHABI1, Olivier DEWITTE2, Nathalie Fagel1, Hans Balder HAVENITH1 1 Institution 1 University of Liège Department of Geology Street, n° 4000 Liège Belgium 2 Institution 2 Royal Museum of Central Africa Department of Geomogy Tervuren Belgium *Corresponding author: sdraidia@gmail.com, Département de Géologie, Quartier Agora, Allée du six Août, 14, B- 4000 LIEGE (Sart Tilman) Tel +32 0497351617 Keywords: mass movement, landslides, landscape evolution, geohazard,. Abstract The mass movement, and especially the instability of the soil and rocks, play a significant role in the changing aspect and the evolution of the landscape worldwide and particularly in tropical region. In Central Africa the landslides and others kind of instabilities are very frequent, important and represent a real threat for both population and economy. The case of Rwanda is remarkable, this country which is known as the country of thousand hills, is rich of various and very complex morphology caracterized by very steep slopes crossed by a dense network of watercourse, powered by a considerable amount of precipitation distributed in two wet seasons. The growing economy of the country brings a lot of project of infrastructures and mines and quarries exploitation (embankments and cuttings) which have a strong impact on the triggering of huge instabilities and so the modification of landscape. These instabilities and the intense activity of the rivers and streams could be considered as the engine who control the shaping and the remodeling of the landform. To understand the evolution process of these instabilities, and then the landscape change we started by the mapping of the instabilities using satellite images and then we went on the field to validate the inventory to identify the morphological aspect of the terrain, to refine our knowledge of the geological nature of the materials by sedimentological analyses on selected samples, and of course to try to better know the impact of the rock's weathering process leading to the constant modification of the landform. The computer-based quantitative analyses using GIS's data processing, were carried out to help to understand the distribution of the instabilities and the geomorphological phenomena observed to better connect and explain the whole information collected. The aim of the study is to bring in more than the mapping of instabilities a response about the process and the evolution of the instabilities and the factors impacting the phenomenon. [less ▲]

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See detailQuand Simon obsédait les moines : le scriptorium de Saint-Trond dans la première moitié du XIIe siècle
Schmidt, Kevin ULg

Conference (2016, January 27)

Étudier l’histoire des relations extérieures d’une communauté cloitrée peut sembler paradoxal. En effet, pourquoi des hommes qui ont choisi de vivre loin de la société séculière s’inquiéteraient-ils de la ... [more ▼]

Étudier l’histoire des relations extérieures d’une communauté cloitrée peut sembler paradoxal. En effet, pourquoi des hommes qui ont choisi de vivre loin de la société séculière s’inquiéteraient-ils de la situation du monde extérieur ? Poser la question revient à souligner un fait indéniable, en parfaite contradiction avec la vie monastique : les interactions entre les monastères et le siècle se sont de tout temps avérées intenses, qu’elles soient justifiées par de nécessaires échanges commerciaux, par l’immixtion des laïcs dans la gestion du temporel de la communauté ou, au contraire, des abbés dans la politique régionale. À ce titre, la situation de l’abbaye de Saint-Trond au début du XIIe siècle constitue un excellent exemple. Menacée fréquemment par son avoué, à la merci d’une attaque du duc de Louvain, la communauté trudonnaire dut choisir intelligemment ses alliés et lutter contre ses opposants. Dans ce contexte, étudier et comparer les textes non normatifs produits au sein du scriptorium du monastère durant la 1ère moitié du XIIe siècle (Gesta abbatum Trudonensium, poèmes, traités didactiques ou textes polémiques) permet de mieux comprendre les combats que les moines menaient dans le silence du cloître, avec leurs armes de prédilection que sont la plume et le parchemin. Les textes rédigés au sein de l’abbaye se caractérisent ainsi par une forte réflexion anti-simoniaque, suscitée par les idées réformatrices et le positionnement politique de l’un de ses abbés les plus importants, Raoul (1108-1138). À l’occasion des 3e rencontres doctorales du département de recherche Transition consacrées aux documents, aux méthodes et aux concepts, nous exposerons quelques conclusions provisoires de notre recherche, toujours en cours, et qui, au-delà d’une enquête strictement politico-institutionnelle, doit permettre d’écrire une nouvelle page d’histoire des mentalités monastiques. [less ▲]

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See detailImporting and Exporting Cord Blood Units
BAUDOUX, Etienne ULg; GIET, Olivier ULg; Jöris, Monique et al

Learning material (2016)

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See detailJUICE UVS radiation test at CSL-ULg
Carapelle, Alain ULg; Grodent, Denis ULg

Scientific conference (2016, January 27)

Progress report of the window fluorescence and quantum efficiency measurements of the JUICE UVS detector exposed to beams of electrons of various energies.

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See detailConclusions
Morato, Nicola ULg

Scientific conference (2016, January 27)

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See detailHydrogeological conditions required for Underground Pumping Storage Hydroelectricity (UPSH) in old mines
Bodeux, Sarah ULg; Pujades, Estanislao ULg; Orban, Philippe ULg et al

in Abstract book (2016, January 26)

Renewable energy sources, because of their intermittence, could not afford a stable production and an adequate variability according to the energy demand. Underground Pumped Storage Hydroelectricity (UPSH ... [more ▼]

Renewable energy sources, because of their intermittence, could not afford a stable production and an adequate variability according to the energy demand. Underground Pumped Storage Hydroelectricity (UPSH) using abandoned mine works is an interesting alternative, in flat regions, to store energy during low demand periods by pumping water from an underground mine to an upper reservoir. From the hydrogeological point of view, two considerations can arise for studying the feasibility before constructing an UPSH plant: 1) the alteration of the natural conditions of surrounding aquifers, and (2) the efficiency of the plant depending on possible leakage in the cavities from the hydrogeological environment. A potential old slate mine was selected through a multi-criterion method and its geometrical and hydrogeological characteristics are used to build a simple but typical model. With the help of the HFEMC approach implemented in the code SUFT3D (HEG-ULg), the groundwater flows are modelled for a representative cavity. Simulations of groundwater flow induced by a UPSH system are performed and the main variables are identified. Piezometric heads around the reservoir oscillate, the magnitude of the oscillations and the time to achieve a pseudo-steady state (magnitude and head reached during oscillations not varying anymore with time) depend on the boundaries, the parameters of the aquifer and the characteristics of the underground reservoir. The required hydrogeological conditions are deduced and a screening methodology can be proposed to assess the main impacts caused in aquifers by UPSH plants. Their efficiency regarding the water level evolution inside the reservoir is also considered accommodating the cyclic pumped storage schemes. [less ▲]

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See detailHow heterogeneity of the K-field influences a heat plume in a shallow alluvial aquifer: responses from a heat tracer test
Klepikova, Maria; Jamin, Pierre ULg; Orban, Philippe ULg et al

in Abstract book (2016, January 26)

Simultaneous solute and heat tracer test provides essential information for a reliable assessment of low temperature geothermal systems. The actual efficiency of ‘open systems’, including heat storage ... [more ▼]

Simultaneous solute and heat tracer test provides essential information for a reliable assessment of low temperature geothermal systems. The actual efficiency of ‘open systems’, including heat storage projects, is strongly affected by the heterogeneity of the hydraulic conductivity field (K-field). It could be also useful for assessing the cumulative impacts of numerous projects in urban areas on the groundwater resources. Using field data from a solute and heat tracer test conducted in the alluvial aquifer of the Meuse River (Belgium), an inverse problem of parameter estimation is solved. The tracing experiment consisted in simultaneously injecting heated water and a dye tracer in a piezometer and monitoring the evolution of groundwater temperature and tracer concentration in the recovery well and in monitoring wells. To get insights in the 3D characteristics of the heat plume, an arrangement of three transects of observation wells was used. The breakthrough curves measured in the recovery well showed that heat transfer in the alluvial aquifer is slower and more dispersive than solute transport. Recovery is very low for heat while in the same time it is measured as relatively high for the solute tracer. This is due to the fact that heat transport is a thermal diffusion dominated process. For conditions corresponding to high Peclet numbers, the hydraulic conductivity is the primary calibration parameter for predicting heat plume distribution. Heat diffusion is larger than molecular diffusion, implying that exchange between groundwater and the porous medium matrix is far more significant for heat than for solute tracers. [less ▲]

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See detailLe notaire dans la régulation sociale des conflits violents dans la Principauté de Liège aux XVIIe et XVIIIe siècles
Drécourt, Aurore ULg

Conference (2016, January 26)

Les actes notariés constituent des sources d’une grande richesse pour l’historien et ont permis de nombreuses études. Inventaires, testaments, contrats de mariage sont autant de documents qui ont ... [more ▼]

Les actes notariés constituent des sources d’une grande richesse pour l’historien et ont permis de nombreuses études. Inventaires, testaments, contrats de mariage sont autant de documents qui ont renouvelé notre connaissance de la vie sociale et économique des populations d’autrefois. Toutefois, les actes réalisés par les notaires sont d’une telle variété qu’ils n’ont pas encore révélé tous leurs secrets. Glissés entre des centaines de documents à valeur économique, certains actes nous renseignent sur la violence de la société d’Ancien Régime et sur les solutions mises en œuvre pour la réguler. Ce genre d’étude s’est appuyé durant des décennies sur des archives judiciaires. Toutefois, il est de plus en plus acquis parmi les historiens de la justice que les populations d’Ancien Régime n’allaient pas systématiquement devant le juge pour régler leurs différends mais préféraient opter pour d’autres stratégies de résolutions de conflits. Le notaire a, à ce titre, joué un rôle majeur. Il est celui devant lequel on établit des accommodements. Il est aussi celui qui retranscrit et authentifie le récit subjectif des victimes, témoins ou agresseurs, qui seront ensuite, selon le choix du comparant, enregistrées ou non au greffe. Aussi l’étude des sources notariales offre-t-elle à l’historien la possibilité de saisir des récits qui ne seraient sans doute jamais parvenues à sa connaissance par la seule étude des archives criminelles. De plus, elles ont l’avantage de présenter des couches plus modestes de la population et de montrer que le judiciaire n’est pas la voie unique, voire préférée, pour régler les conflits. La présente communication propose de montrer toute la richesse de ces documents si peu étudiés par les historiens, le tout dans le cadre de la Principauté de Liège au XVIIe siècle. [less ▲]

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See detailContinuous Departure Time of Day Preferences for Continental U.S. Airline Markets Segmented by Distance, Direction of Travel, Number of Time Zones, Day of Week and Itinerary Type
Lurkin, Virginie ULg; Garrow, Laurie; Higgins, Matthew et al

E-print/Working paper (2016)

Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice model ... [more ▼]

Airlines use itinerary choice models to allocate the total number of passengers in a city pair to specific itineraries. In a related paper, we estimated a multinomial logit (MNL) itinerary choice model using database of more than 3 million tickets for Continental U.S. markets provided by the Airlines Reporting Corporation that accounted for price endogeneity. The size and comprehensiveness of our database allowed us to estimate highly refined continuous departure time of day preference curves that account for distance, direction of travel, the number of time zones traversed, departure day of week and itinerary type (outbound, inbound or one-way). This paper and accompanying Excel spreadsheet located at http://garrowlab.ce.gatech.edu contain the results of all model coefficients (including the 1260 time of day parameters) and summarize results in a series of ten figures. These highly-refined time of day preference curves can be used by airlines, researchers, and government organizations in the evaluation of demand-management and other policies. [less ▲]

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See detailAccounting for Price Endogeneity in Airline Itinerary Choice Models: An Application to Continental U.S. Markets
Lurkin, Virginie ULg; Garrow, Laurie; Higgins, Matthew et al

E-print/Working paper (2016)

Network planning models, which forecast the profitability of airline schedules, support many critical decisions, including equipment purchase decisions. Network planning models include an itinerary choice ... [more ▼]

Network planning models, which forecast the profitability of airline schedules, support many critical decisions, including equipment purchase decisions. Network planning models include an itinerary choice model which is used to allocate air total demand in a city pair to different itineraries. Multinomial logit (MNL) models are commonly used in practice and capture how individuals make trade-offs among different itinerary attributes; however, none that we are aware of account for price endogeneity. This study formulates an itinerary choice model that is consistent with those used by industry and corrects for price endogeneity using a control function that uses several types of instrumental variables. We estimate our models using database of more than 3 million tickets provided by the Airlines Reporting Corporation. Results based on Continental U.S. markets for May 2013 departures show that models that fail to account for price endogeneity overestimate customers’ value of time and result in biased price estimates and incorrect pricing recommendations. The size and comprehensiveness of our database allows us to estimate highly refined departure time of day preference curves that account for distance, direction of travel, the number of time zones traversed, departure day of week and itinerary type (outbound, inbound or one-way). These time of day preference curves can be used by airlines, researchers, and government organizations in the evaluation of different policies such as congestion pricing. [less ▲]

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See detailUn nouveau regard sur la tenture des Travaux d’Hercule de Marie de Hongrie (Patrimonio Nacional, série 23)
Laruelle, Anne-Sophie ULg

Conference (2016, January 26)

Les exploits d’Hercule suscitent depuis l’Antiquité de multiples interprétations et constituent l’un des thèmes littéraires et artistiques les plus appréciés à la Renaissance. Plus que toute autre figure ... [more ▼]

Les exploits d’Hercule suscitent depuis l’Antiquité de multiples interprétations et constituent l’un des thèmes littéraires et artistiques les plus appréciés à la Renaissance. Plus que toute autre figure antique, Hercule sert d’exemple aux souverains car il est considéré comme le modèle par excellence de la "vertu active". Ses Travaux sont l’une des sources d’inspiration majeures de la tapisserie flamande au XVIe siècle. Cette communication ambitionne d’apporter un nouvel éclairage sur la tenture en douze pièces achetée en 1535 par la régente des anciens Pays-Bas, Marie de Hongrie, à l’atelier bruxellois Dermoyen. Nous verrons que cette tenture connaît un véritable succès, qui conduit les ateliers flamands à réaliser de nombreuses rééditions jusqu’à la fin du siècle. Notre intervention, fondée sur une méthode déjà bien établie par les spécialistes de la tapisserie, s’articulera autour des quatre composantes principales de ce genre artistique : les pièces existantes et leur iconographie, la manufacture qui les a tissées, les artistes qui en ont fourni les modèles aux liciers, et enfin le commanditaire. [less ▲]

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