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See detailGeoarchaeology of the Ancient Harbour of Utica in a Deltaic Context (2014 and 2015)
Pleuger, Elisa ULg; Gadhoum, Ahmed; Abichou, Hakim et al

Conference (2016, January 28)

Ancient authors 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 ... [more ▼]

Ancient authors 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. Based on this observation, our geoarchaeological research focuses on two main issues: - Was there a marine environment around the promontory of Utica, which could shelter harbour structures? - Why the city, formerly a seaport city, is today located 10 km from the coast? Can the wadi be solely responsible of such an important sediment accumulation in a few millennia? Have any natural or anthropogenic factors influenced this deltaic progradation over the centuries? First results permitted drawing an hypothesis of the coastline during Antiquity to the effect that the Utica promontory was surrounded by the sea in an earlier era. (1) Effectively, the «North compartment» of the delta was covered by the sea at a given time, which will be determined by the next radiocarbon dating. But the sea still brushed the north side of the promontory during the Roman period, as evidenced by the potsherds found in one of the cores. This deep marine bay could be a potential location for harbour infrastructure prior to clogging of the bay by the sediments carried by the wadi. (2) The «corridor» area, materialised by the promontories of Utica and Kalâat el-Andalous, was also invaded by the sea at one time. The many artifacts found in this core attest the occupation of this area, outside of the maximal extension of the ancient city according to A. Lézine. Dating of the marine units in the two cores will bring essential data: * to establish the chronological framework of the retreat of the coastline and of the clogging of the bay; * to understand the passage of the Medjerda into the «North compartment» by the corridor Utica-Kalâat. The geoarchaeological results corroborate ancient sources. Utica was able to welcome important harbour structures, since the presence of a deep marine environment is attested around the promontory, but these remains are probably 5 m deep under the alluvium of the Wadi Medjerda. [less ▲]

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See detailLa violence de l’image. Débats autour de l’irreprésentable (G. Didi-Huberman/ J. Rancière)
Hagelstein, Maud ULg

Scientific conference (2016, January 28)

L’image peut être vectrice de débats politiquement complexes (tendus), notamment quand elle est porteuse de violence – quand elle montre/représente la violence. Or, on sait bien qu’au XXème siècle, il y a ... [more ▼]

L’image peut être vectrice de débats politiquement complexes (tendus), notamment quand elle est porteuse de violence – quand elle montre/représente la violence. Or, on sait bien qu’au XXème siècle, il y a un événement qui fait rupture de ce point de vue, en tant qu’il pousse la violence exercée par des hommes sur d’autres hommes à son paroxysme : la Shoah. Comme on peut l’observer dans toutes sortes de polémiques qui entourent la possibilité même de sa représentation (la littérature sur le sujet est vraiment très dense), la Shoah implique un rapport extrêmement difficile au document visuel, dont on a d’ailleurs longtemps pensé qu’il était pratiquement inexistant. « Il n’y a pas d’images de la Shoah » peut s’entendre de deux manières : soit qu’il n’y ait pas d’images effectives du processus d’extermination, soit que la possibilité même de représenter ce processus soit refusée par l’intensité de sa violence. La représentation visuelle de la Shoah pose problème. Non seulement la représentation imagée fictionnelle (cf. le cas récent du film Le fils de Saul de László Nemes – grand prix du jury au festival de Cannes), mais aussi, de manière plus étonnante encore peut-être, la représentation imagée documentaire. Autrement dit : même la diffusion de l’iconologie concentrationnaire, qui se réduit à presque rien puisque bon nombre de photographies ont été détruites par les nazis, soulève des réactions extrêmement vives. [less ▲]

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See detailEffets anthropiques sur les écosystèmes marins
Richir, Jonathan ULg; Grosjean, Philippe

Scientific conference (2016, January 28)

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See detailContribution of Capillary Electrophoresis and Ion Mobility Spectrometry to probe conformational change during desolvation
Far, Johann ULg; Delvaux, Cédric ULg; Kune, Christopher ULg et al

Conference (2016, January 28)

The transfer of ions from the solution to the gas phase is a critical step to produce « native species ». Coming from a highly solvating medium, ionic species will tend to find a new equilibrium ... [more ▼]

The transfer of ions from the solution to the gas phase is a critical step to produce « native species ». Coming from a highly solvating medium, ionic species will tend to find a new equilibrium conformation in the gas phase. The pathway to reach the thermodynamically stable conformation involves crossing potential barriers of different heights. When these barriers are too high compared to the internal energy of the ions, it will result in “partial memories” (as structural preservation) of the conformation in solution. In order to evaluate the effect of the solvent evaporation and of the various collision processes encountered by the ions in the mass spectrometer, we developed two strategies: The first strategy consists in comparing in a single experiment the shape of the ions in solution and in the gas phase. Data are obtained by coupling Capillary Electrophoresis (CE) with Ion Mobility Mass Spectrometry (IMS). Drift times in solution and in the gas phase are directly compared. Deviations from their correlation points out changes in folding upon desolvatation. Preliminary results show that some of peptides issued from tryptic digest of BSA clearly change their conformation during desolvatation. The second strategy consists to monitor the shape of the different conformers observed for the intact cytochrome C during native runs in capillary electrophoresis and “native” ion mobility mass spectrometry, both using a physiological TRIS acetic pH7 buffer compared to a “MS friendly” ammonium acetate pH7 buffer. Finally as preliminary study, we proposed to use homopolymers for better understanding about the folding behavior in gas phase and the resulting shape of these ions using ion mobility spectrometry. [less ▲]

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See detailMesure ambulatoire de la PA (MAPA) : pour qui?, pourquoi?, comment?
Krzesinski, Jean-Marie ULg

Scientific conference (2016, January 28)

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See detailHolocene paleoenvironmental reconstructions from Belgian peatbog
Allan, Mohammed ULg; VERHEYDEN, sophie; Le roux, gael et al

Conference (2016, January 27)

Atmospheric deposition is an important part of the global climate system, and plays a key role in the marine and terrestrial biogeochemical cycles as a source for major and trace nutrient elements ... [more ▼]

Atmospheric deposition is an important part of the global climate system, and plays a key role in the marine and terrestrial biogeochemical cycles as a source for major and trace nutrient elements. Reconstruction of atmospheric deposition is crucial to understand the effects of the increased atmospheric depositions induced by humans on the environment and to help understanding Holocene climate variability. This study investigated potential paleoenvironmental proxies provided by major and trace elements and stable isotopes compositions of peat bogs. Peat bog cores were collected from Hautes-Fagnes plateau (Misten bog) (SE-Belgium). The analyses of Rare Earth Elements (REE) and lithogenic element concentrations as well as Nd isotopes were performed by HR-ICP-MS and MC-ICP-MS respectively, in a  7 m peat section representing 7300 years, dated by 210Pb and 14C methods. The Misten bog is highly affected by atmospheric supplies (natural and anthropogenic) and can be used to establish the changes in atmospheric dust during the Mid-Late Holocene. Dust fluxes show pronounced increase at 3200-2800BC, 600BC, AD600, 1000AD, 1200AD and from 1700 AD corresponding to local and regional human activities combined with climate change. Peat humification and testate amoebae were used to evaluate hydroclimatic conditions. The Nd values show large variability, between -5 and –13, identifying three major sources of dust: local soils, distal volcanic and desert particles. Our results provide evidence that climate forcing may be detected in ombrotrophic peat, even for the historical period that is characterised by a mixed climate-human control. [less ▲]

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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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