Last 7 days
Bookmark and Share    
See detailUn laboratoire d'auto-immunité paperless: mythe ou réalité?
LUTTERI, Laurence ULg

Conference (2016, January 29)

Detailed reference viewed: 13 (0 ULg)
See detailSalt but not glucocorticoïds enhances Th17 differentiation from naïve T cells in vitro
Delens, Loïc ULg; SERVAIS, Sophie ULg; Vrancken, Louise et al

Poster (2016, January 29)

Detailed reference viewed: 22 (7 ULg)
Full Text
See detailCo-simulation of Electromagnetic Transients and Phasor Models of Electric Power Systems
Plumier, Frédéric ULg

Doctoral thesis (2016)

This study investigates and improves methods used for the combination of phasor and electromagnetic transients time domain simulations of power systems. It involves the study of the protocols of ... [more ▼]

This study investigates and improves methods used for the combination of phasor and electromagnetic transients time domain simulations of power systems. It involves the study of the protocols of computation, the comparison of the different kinds of boundary conditions used to represent one sub-system when simulating the other, and the interfacing of phasor and electromagnetic transients models. The Nordic system has been used to realize the tests. Illustrative simulation results are reported for the case of a single and of multiple boundary buses between the sub-systems. [less ▲]

Detailed reference viewed: 85 (26 ULg)
Full Text
See detailOne day walk
Gantois, Gisele ULg

Scientific conference (2016, January 29)

One day walk Within my research I’m trying to find methods and tools to trace, unveil and map social & ecological values of built heritage in rural areas. In this contribution I’d like to discuss one of ... [more ▼]

One day walk Within my research I’m trying to find methods and tools to trace, unveil and map social & ecological values of built heritage in rural areas. In this contribution I’d like to discuss one of the methods I developed namely ‘A protocol for walking.’ The approach focuses on thinking through walking and drawing rather than an attempt to directly resolve or structure a problem. It aims at triggering curiosity not necessarily resulting in a solution or a conclusion while following a non-linear path. Walking acts like a starting trigger to investigate the cultural landscape and aims at generating and facilitating a thought process. It is therefore a way of reflecting. While walking, the act of watching closely can lead to real closeness and might help to gain insight into people’s and other living creatures attitudes, value system, concerns, motivations, aspirations, culture and behaviours and their interaction with space. As one needs the sharp eye to discover even the most trusted things, the act of drawing while walking becomes a way of observing. The drawing turns into a tool for the eye and makes one seeing things differently. The essential concept in this methodology is to approach the problem in an indirect way by postponing the problem. This is a way of tackling the uncertainty of the ‘ill-defined’ nature of the problem statement as values and significances cannot easily or clearly be defined. [less ▲]

Detailed reference viewed: 22 (0 ULg)
See detailCaught in the middle: the Maisierian, a lithic tradition between two worlds
Touzé, Olivier ULg

Conference (2016, January 29)

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailData-driven selection of the minimum-gradient support parameter in time-lapse focused electrical imaging
Nguyen, Frédéric ULg; Kemna, Andreas; Robert, Tanguy et al

in Geophysics (2016), 81(1), 1-5

We have considered the problem of the choice of the minimum-gradient support (MGS) parameter in focused inversion for time-lapse (TL) electric resistivity tomography. Most existing approaches have relied ... [more ▼]

We have considered the problem of the choice of the minimum-gradient support (MGS) parameter in focused inversion for time-lapse (TL) electric resistivity tomography. Most existing approaches have relied either on an arbitrary choice of this parameter or one based on the prior information, such as the expected contrast in the TL image. We have decided to select the MGS parameter using a line search based on the value of the TL data root-mean-square misfit at the first iteration of the nonlinear inversion procedure. The latter was based on a Gauss-Newton scheme minimizing a regularized objective function in which the regularization functional was defined by the MGS functional. The regularization parameter was optimized to achieve a certain target level, following the Occam principles. We have validated our approach on a synthetic benchmark using a complex and heterogeneous model and determined its effectiveness on electric tomography TL data collected during a salt tracer experiment in fractured limestone. Our results have determined that the approach was successful in retrieving the focused anomaly and did not rely on prior information. [less ▲]

Detailed reference viewed: 75 (15 ULg)
Full Text
Peer Reviewed
See detailTwo cases of atypical CALR mutations in MPN patients
SAGOT, Clémence ULg; CHARLIER, Hélène ULg; KOOPMANSCH, Benjamin ULg et al

Poster (2016, January 29)

Detailed reference viewed: 22 (4 ULg)
Full Text
See detailThe BRICS New Development Bank: a China-led challenge to the Western Hegemony
WCusson, Gabrielle ULg; Culpi, Ludmila ULg

Scientific conference (2016, January 28)

Detailed reference viewed: 30 (2 ULg)
Peer Reviewed
See detailHéroïsme en clôture : de la contemplative silencieuse à l’amazone chrétienne. Discours et représentations de l’héroïsme féminin sous la plume d’annonciades célestes au XVIIe siècle
Henneau, Marie-Elisabeth ULg

Conference (2016, January 28)

Les annonciades célestes – ordre féminin d’origine génoise fondé en 1604 et implanté en pleine Guerre de Trente Ans sur la Dorsale catholique, face aux territoires protestants – ont produit une nombre ... [more ▼]

Les annonciades célestes – ordre féminin d’origine génoise fondé en 1604 et implanté en pleine Guerre de Trente Ans sur la Dorsale catholique, face aux territoires protestants – ont produit une nombre considérable de chroniques, annales, journaux, mémoires, biographies spirituelles, abrégés de vertus, lettres, autobiographies et autres billets d’humeur, autant de témoignages d’expériences, vécues en espace clos, mais toujours en prise sur le monde, en quête d’éternité, mais sans cesse plongées dans le temps en cours. Des expériences riches et singulières, qui ont eu souvent raison des timidités ou des retenues des intéressées pour aboutir à des relations particulièrement savoureuses où alternent écriture de soi et écriture de l’histoire. Cette documentation inédite et pour une bonne part inexploitée – au contraire des fonds relatifs aux Visitandines – permet, notamment, d’approcher leur conception de la moniale tridentine idéale, mise en scène et en mots par des autrices dont le génie littéraire n’égale sans doute pas les grandes plumes de Port-Royal, mais dont la production révèle tant le large éventail de représentations de soi élaborées par les annonciades que la réception intra muros des discours tenus à leur propos dans le siècle. Contemplatives vouées à une très stricte clôture, ces femmes se voient néanmoins en missionnaires conquérantes d’un espace à (ré)évangéliser. Il s’agira d’étudier d’une part comment elles intègrent les recommandations de leur entourage masculin qui les incitent à la discrétion, à l’effacement, au silence, bref, à un héroïsme comparable à celui de la Vierge, qui dans le secret de sa chambre n’en conçoit pas moins le Sauveur de l’humanité et, d’autre part, et sans que cela soit contradictoire, comment ces cloîtrées vivent les péripéties de leur expansion en aventurières de Dieu et souhaitent, en les narrant, manifester au monde leur héroïsme au service de la Réforme catholique. [less ▲]

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailHolocene paleoenvironmental reconstructions from speleothem and peat bog archives
Allan, Mohammed ULg; VERHEYDEN; CRUCIFIX, Michel et al

Poster (2016, January 28)

The geological materials (speleothems and peatbogs) presented in Belgium (Hautes-Fagnes Plateau, Ardennes caves) are interesting archives for atmospheric pollution record and climate variability. Both ... [more ▼]

The geological materials (speleothems and peatbogs) presented in Belgium (Hautes-Fagnes Plateau, Ardennes caves) are interesting archives for atmospheric pollution record and climate variability. Both archives are easily dated (U/Th and counting for laminated speleothems, 210Pb and 14C for peatbogs), have a high temporal resolution (decadal to seasonal), contain multiple measurable parameters (elemental geochemistry, stable isotopes, radiogenic Nd and Pb isotopes, pollens, rates of peat humification, luminescence and thickness of laminated speleothems) and depending on environmental conditions of temperature and / or humidity. The aim of this study is to determine the sensitivity of both archives (speleothems and peatbogs) to human perturbations and climate changes. Our ultimate goal is to contribute to a better understanding of natural interglacial climate variability by generating and confronting high resolution paleoclimate reconstructions from 2 continental archives. [less ▲]

Detailed reference viewed: 54 (1 ULg)
Full Text
See detailTightening linearizations of non-linear binary optimization problems
Rodriguez Heck, Elisabeth ULg; Crama, Yves ULg

Conference (2016, January 28)

Detailed reference viewed: 19 (3 ULg)
Full Text
Peer Reviewed
See detailCombining acceleration techniques for pricing in a VRP with time windows
Michelini, Stefano ULg; Arda, Yasemin ULg; Küçükaydin, Hande

Conference (2016, January 28)

In this study, we investigate a solution methodology for a variant of the VRP with time windows. The cost of each route depends on its overall duration (including waiting times), while the departure time ... [more ▼]

In this study, we investigate a solution methodology for a variant of the VRP with time windows. The cost of each route depends on its overall duration (including waiting times), while the departure time of a vehicle is a decision variable. Furthermore, each route has a maximum permitted duration. In order to solve this problem with a branch-and-price methodology, we study also the associated pricing problem, an elementary shortest path problem with resource constraints (ESPPRC). Compared to the classical ESPPRC, this variant admits an infinite number of Pareto-optimal states. In order to tackle this, it was shown in [1] that it is possible to represent the total travelling time as a piecewise linear function of the service start time at the depot. Together with this representation, an appropriate label structure and domi- nance rules are proposed and integrated into an exact bidirectional dynamic programming algorithm [2]. It is possible to implement certain acceleration techniques in the dynamic program- ming algorithm used to solve the pricing problem. We focus on two of these techniques: decremental state space relaxation (DSSR), introduced in [3], and ng-route relaxation, in- troduced in [4] and [5]. DSSR aims to enforce gradually the constraints on the elementarity of the path, which adversely affect the number of generated and dominated labels. A set of critical nodes is iteratively populated, and elementarity is enforced only on these critical nodes. When using ng-route relaxation, a neighbourhood is defined for each vertex. Then, the labels are extended such that, thanks to this neighbourhood structure, it is possible to allow only cycles that are relatively expensive and therefore less likely to appear in the optimal solution. In this study, we explore several different strategies used to apply these techniques, for example initialization strategies for the critical vertex set in DSSR, or the size of the neighbourhoods for ng-route relaxation. We also analyze two ways of combining DSSR and ng-route relaxation. The different algorithmic choices are represented as categorical parameters. The categorical parameters, together with the numerical ones, can be tuned with tools for automatic algorithm configuration such as the irace package [6]. We discuss how this column generation procedure can be included as a component in the development of a matheuristic based on the idea in [7], which consists in a collaboration scheme between a branch-and-price algorithm, an exact MIP solver, and a metaheuristic. [less ▲]

Detailed reference viewed: 15 (1 ULg)
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 ▲]

Detailed reference viewed: 39 (5 ULg)
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 ▲]

Detailed reference viewed: 55 (0 ULg)