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See detailNumerical Modelling of Thin-Walled Stainless Steel Structural Elements in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Simoes da Silva, Luís et al

in Fire Technology (2010), 46(1), 91-108

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program ... [more ▼]

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program SAFIR, including imperfections. In order to make these simulations, two main changes in the program were made: (i) the code was changed in order to deal with the stainless steel 2D material constitutive law to be used with shell elements and (ii) the possibility of the program to take into account residual stresses with shell finite elements was introduced. The stainless steel stress–strain relationship at high temperatures was based on the one presented in part 1.2 of Eurocode 3. To model the strain hardening exhibited by the stainless steels, using the shell element formulation, an approximation to the Eurocode 3 constitutive law was needed. Local and global geometrical imperfections were considered in the simulations. The paper shows the influence of the residual stresses on the ultimate load-carrying capacity of thin-walled stainless steel structural elements in case of fire. [less ▲]

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See detailRiddles and Counterpoint: Mozart's Pupil Franz Jacob Freystädtler
Steyaert, Kris ULiege; Sprague, Catherine

in Newsletter of the Mozart Society of America (2010), XIV(1), 14-17

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See detailAnthropogenic and naturally-produced organobrominated compounds in marine mammals from Brazil
Dorneles, Paulo R; Lailson-Brito, José; Dirtu, Alin C et al

in Environment International (2010), 36(1), 60-67

Liver samples from 51 cetaceans, comprising 10 species, stranded between 1994 and 2006 in a highly industrialized and urbanized region in Southeast Brazil, were analyzed for polybrominated diphenyl ethers ... [more ▼]

Liver samples from 51 cetaceans, comprising 10 species, stranded between 1994 and 2006 in a highly industrialized and urbanized region in Southeast Brazil, were analyzed for polybrominated diphenyl ethers (PBDEs) and methoxylated-PBDEs (MeO-PBDEs). A concentration range of PBDEs (3-5960 ng/g lw) similar to that observed in Northern Hemisphere dolphins was found. MeO-PBDE concentrations in continental shelf (CS) dolphins from Brazil are among the highest detected to date in cetaceans (up to 250 µg/g lw). Higher [Sigma]MeO-PBDE concentrations were measured in CS and oceanic dolphins than in estuarine dolphins. The [Sigma]PBDE/[Sigma]MeO-PBDE ratio varied significantly ranging from a mean value of 7.12 to 0.08 and 0.01 for estuarine, CS and oceanic species, respectively. A positive correlation was observed between [Sigma]PBDE and year of stranding of male estuarine dolphins (Sotalia guianensis), which suggests temporal variation in the exposure. Placental transfer of organobrominated compounds was also evidenced in S. guianensis. [less ▲]

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See detailADDICTION AU MMORPG : QUAND LE REEL EST SOUS L’EMPRISE DU VIRTUEL
Bataille, Stéphanie; Triffaux, Jean-Marc ULiege

Poster (2010, January)

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See detailRéanimation aux urgences pédiatriques
Battisti, Oreste ULiege; Brasseur, Edmond ULiege; D'Orio, Vincenzo ULiege et al

Learning material (2010)

précis des principales situations aux urgences pédiatriques

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See detailEtude des habitats utilisés par le Pic mar en Région wallonne à partir des données de l'inventaire forestier
Lehaire, François ULiege; Paquet, Jean-Yves; Monticelli, David et al

in Forêt Wallonne (2010), (104), 50-61

Le Pic mar est une espèce-clé de nos forêts feuillues. Il apparaît généralement comme étant un indicateur des forêts de grande valeur biologique. Autrefois cantonné dans les grands massifs feuillus ... [more ▼]

Le Pic mar est une espèce-clé de nos forêts feuillues. Il apparaît généralement comme étant un indicateur des forêts de grande valeur biologique. Autrefois cantonné dans les grands massifs feuillus d’Ardenne et de Gaume, il a remarquablement étendu son aire à toute la Wallonie lors des deux dernières décennies. L’étude de cette aire d’extension récente devrait nous permettre de mieux apprécier ses exigences écologiques dans un habitat encore peu ou mal connu et pourrait ouvrir des portes vers des recommandations de gestion forestière plus précises quant aux pics et leur biodiversité associée. [less ▲]

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See detailLes usagers, au coeur de la "modernisation" de la justice belge?
Lejeune, Aude ULiege

in Revue Nouvelle (2010), 65(1), 61-67

La Justice joue à la fois le rôle de service public et de pouvoir judiciaire qui exerce des prérogatives de la puissance publique, et la définition même de ses « usagers » est polysémique. L’analyse des ... [more ▼]

La Justice joue à la fois le rôle de service public et de pouvoir judiciaire qui exerce des prérogatives de la puissance publique, et la définition même de ses « usagers » est polysémique. L’analyse des multiples acceptions du terme permet de souligner les enjeux des réformes en cours. La création des maisons de justice à la fin des années nonante illustre de manière exemplaire le recours à la rhétorique des usagers, placés au coeur de la « modernisation » de l’institution judiciaire ainsi que les enjeux liés à la définition du contenu de cette notion. De manière plus générale, ce recours à l’usager lance un nouveau défi à l’institution judiciaire, amenée à se positionner par rapport aux questions de « modernisation » et de management, sans négliger pour autant les risques qu’engendrerait une banalisation de la fonction de Justice. [less ▲]

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See detailSingle nucleotide differences (SNDs) in the dbSNP database may lead to errors in genotyping and haplotyping studies.
Musumeci, Lucia ULiege; Arthur, Jonathan; Cheung, Florence et al

in Human Mutation (2010), 31(1), 63-73

The creation of single nucleotide polymorphism (SNP) databases (such as NCBI dbSNP) has facilitated scientific research in many fields. SNP discovery and detection has improved to the extent that there ... [more ▼]

The creation of single nucleotide polymorphism (SNP) databases (such as NCBI dbSNP) has facilitated scientific research in many fields. SNP discovery and detection has improved to the extent that there are over 17 million human reference (rs) SNPs reported to date (Build 129 of dbSNP). SNP databases are unfortunately not always complete and/or accurate. In fact, half of the reported SNPs are still only candidate SNPs and are not validated in a population. We describe the identification of SNDs (single nucleotide differences) in humans, that may contaminate the dbSNP database. These SNDs, reported as real SNPs in the database, do not exist as such, but are merely artifacts due to the presence of a paralogue (highly similar duplicated) sequence in the genome. Using sequencing we showed how SNDs could originate in two paralogous genes and evaluated samples from a population of 100 individuals for the presence/absence of SNPs. Moreover, using bioinformatics, we predicted as many as 8.32% of the biallelic, coding SNPs in the dbSNP database to be SNDs. Our identification of SNDs in the database will allow researchers to not only select truly informative SNPs for association studies, but also aid in determining accurate SNP genotypes and haplotypes. [less ▲]

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See detailA fast gas chromatographic method for the study of semiochemical slow release formulations
Heuskin, Stéphanie ULiege; Lorge, Stéphanie; Leroy, Pascal ULiege et al

Poster (2010, January)

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See detailLa prison, entre crise et modernisation
Dubois, Christophe ULiege

in Revue Nouvelle (2010)

L’actualité médiatique de ces derniers mois a relaté plusieurs cas de désordres survenus dans nos prisons : actes de violence, grève du personnel, évasions, suicides, mutineries, etc. Derrière ces ... [more ▼]

L’actualité médiatique de ces derniers mois a relaté plusieurs cas de désordres survenus dans nos prisons : actes de violence, grève du personnel, évasions, suicides, mutineries, etc. Derrière ces indicateurs de crise, on peut également déceler les traces, de plus en plus nombreuses, d’un vaste chantier de modernisation dans lequel l’administration pénitentiaire s’est engagée, comme l’indiquent le plan de management initié par le directeur général, la reconfiguration de la profession de directeur ou encore l’introduction de notions managériales dans les discours de ces derniers. Les expériences anglaises et néerlandaises offrent une perspective décentrée pour saisir les opportunités de changement que permettent (ou non) les crises et le Nouveau Management Public. Nous proposons ici de nous inspirer de ces expériences pour en extraire quelques pistes de réflexion à propos de notre administration pénitentiaire. [less ▲]

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See detailChemical contamination in fish species from rivers in the North of Luxembourg: Potential impact on the Eurasian otter (Lutra lutra).
Boscher, Aurore; Gobert, Sylvie ULiege; Guignard, C. et al

in Chemosphere (2010), 78

Contamination levels of PCBs, and of the heavy metals cadmium (Cd), lead (Pb) and mercury (Hg) were analyzed in four fish species from seven rivers in the North of Luxembourg. During August and September ... [more ▼]

Contamination levels of PCBs, and of the heavy metals cadmium (Cd), lead (Pb) and mercury (Hg) were analyzed in four fish species from seven rivers in the North of Luxembourg. During August and September 2007, 85 samples of fish were collected belonging to four species: the stone loach (Barbatula barbatula, n = 12 pools), the chub (Squalius cephalus, n = 36), the barbel (Barbus barbus, n = 23) and eel (Anguilla anguilla, n = 14). The concentration of seven indicator PCBs (P7PCBs) reached a mean of 39 ng g􏰀1 and varied between 4.0 and 346.2 ng g􏰀1 (wet wt) depending on the site and species. Fish collected at Wal- lendorf on the Our River and sites on the Wiltz and the Clerve rivers showed the highest concentrations for PCBs. In comparison with 1994, PCB levels in fish decreased strongly during the last decade in these rivers. Lead was detected at low levels (0–181.4 ng g􏰀1 wet wt). Mercury concentrations ranged between 10.3 and 534.5ngg􏰀1 (wet wt) exceeding maximum tolerable levels for human consumption of 500 ng g􏰀1 in two fish out of 85. Chubs and eels from the Sûre River were the most contaminated by mer- cury. Cadmium levels varied between 4.0 and 103.9 ng g􏰀1 (wet wt). In addition to mercury in fish, cad- mium was the most problematic pollutant on the Our, the Wiltz, the Clerve and the Troine Rivers, because values found in 20% of fish exceeded the threshold of about 10–50 ng g􏰀1 (wet wt) recommended for human health. The total PCB level predicted to accumulate in livers from otter potentially feeding on these fish based on a previously published mathematical model is 37.7 lg g􏰀1 (lipid wt), which is between a proposed ‘‘safe level” and a ‘‘critical level” for otters. Rivers in the North of Luxembourg are thus to some extent polluted, and the establishment of otter populations could be affected by current levels of contamination. [less ▲]

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See detailBande dessinée, art brut et dissidence
Dejasse, Erwin ULiege

in Neuvième art 2.0. (2010)

The article deals with the connections between comics on one hand and art brut and outsider art on the other hand.

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See detailThe Migration of the Flightless Bird: Janet Frame's Towards Another Summer
Delrez, Marc ULiege

in Journal of Post-Colonial Cultures and Societies (2010)

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See detailViolence dans les stades de football: Les supporters acteurs de la prévention?
Comeron, Manuel ULiege

in Cahiers de la Sécurité (2010), 11

Supporter violence in football grounds is not only characterised by its spontaneity but also by a more organised and premeditated form of violence. The problem seemed to be under control in most countries ... [more ▼]

Supporter violence in football grounds is not only characterised by its spontaneity but also by a more organised and premeditated form of violence. The problem seemed to be under control in most countries in Europe, due to the considerable security measures that have been put in place. Unfortunately, we are now seeing a resurgence of the phenomenon with a new generation of hooligans. For a number of years, in depth, preventive, educational measures, such as “Fan coaching”, have been used with targeted groups of supporters. The recent evolution in supporter attitude in Europe has shown that a number of responsible citizens have taken the matter into their own hands and organised similar "social" programmes to reduce the tension, aggression and violence at football matches. [less ▲]

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See detailPost-buckling behaviour and strength of multi-stiffened aluminium panels under combined axial compression and lateral pressure
Reza Khedmati, Mohammad; Bayatfar, Abbas; Rigo, Philippe ULiege

in Marine Structures (2010), 23

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See detailEvolution of ontogenetic allometry shaping giant species: a case study from the damselfish genus Dascyllus (Pomacentridae)
Frederich, Bruno ULiege; Sheets, David

in Biological Journal of the Linnean Society (2010), 99(1), 99-117

The evolution of body size, the paired phenomena of giantism and dwarfism, has long been studied by biologists and paleontologists. However, detailed investigations devoted to the study of the evolution ... [more ▼]

The evolution of body size, the paired phenomena of giantism and dwarfism, has long been studied by biologists and paleontologists. However, detailed investigations devoted to the study of the evolution of ontogenetic patterns shaping giant species are scarce. The damselfishes of the genus Dascyllus appear as an excellent model for such a study. Their well understood phylogeny reveals that large-bodied species have evolved in two different clades. Geometric morphometric methods were used to compare the ontogenetic trajectories of the neurocranium and the mandible in both small-bodied (Dascyllus aruanus and Dascyllus carneus; maximum size: 50–65 mm standard length) and giant (Dascyllus trimaculatus and Dascyllus flavicaudus; maximum size: 90–110 mm standard length) Dascyllus species. At their respective maximum body size, the neurocranium of the giant species is significantly shorter and have a higher supraoccipital crest relative to the small-bodied species, whereas mandible shape variation is more limited and is not related to the ‘giant’ trait. The hypothesis of ontogenetic scaling whereby the giant species evolved by extending the allometric trajectory of the small-bodied ones (i.e. hypermorphosis) is rejected. Instead, the allometric trajectories vary among species by lateral transpositions. The rate of shape changes and the type of lateral transposition also differ according to the skeletal unit among Dascyllus species. Differences seen between the two giant species in the present study demonstrate that giant species may appear by varied alterations of the ancestor allometric pattern. [less ▲]

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See detailA cautious approach to generalization in reinforcement learning
Fonteneau, Raphaël ULiege; Murphy, Susan; Wehenkel, Louis ULiege et al

in Proceedings of the 2nd International Conference on Agents and Artificial Intelligence (2010, January)

In the context of a deterministic Lipschitz continuous environment over continuous state spaces, finite action spaces, and a finite optimization horizon, we propose an algorithm of polynomial complexity ... [more ▼]

In the context of a deterministic Lipschitz continuous environment over continuous state spaces, finite action spaces, and a finite optimization horizon, we propose an algorithm of polynomial complexity which exploits weak prior knowledge about its environment for computing from a given sample of trajectories and for a given initial state a sequence of actions. The proposed Viterbi-like algorithm maximizes a recently proposed lower bound on the return depending on the initial state, and uses to this end prior knowledge about the environment provided in the form of upper bounds on its Lipschitz constants. It thereby avoids, in way depending on the initial state and on the prior knowledge, those regions of the state space where the sample is too sparse to make safe generalizations. Our experiments show that it can lead to more cautious policies than algorithms combining dynamic programming with function approximators. We give also a condition on the sample sparsity ensuring that, for a given initial state, the proposed algorithm produces an optimal sequence of actions in open-loop. [less ▲]

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See detailA relaxed approach to combinatorial problems in robustness and diagnostics
Critchley, Frank; Schyns, Michael ULiege; Haesbroeck, Gentiane ULiege et al

in Statistics and Computing (2010), 20(1), 99-115

A range of procedures in both robustness and diagnostics require optimisation of a target functional over all subsamples of given size. Whereas such combinatorial problems are extremely difficult to solve ... [more ▼]

A range of procedures in both robustness and diagnostics require optimisation of a target functional over all subsamples of given size. Whereas such combinatorial problems are extremely difficult to solve exactly, something less than the global optimum can be ‘good enough’ for many practical purposes, as shown by example. Again, a relaxation strategy embeds these discrete, high-dimensional problems in continuous, low-dimensional ones. Overall, nonlinear optimisation methods can be exploited to provide a single, reasonably fast algorithm to handle a wide variety of problems of this kind, thereby providing a certain unity. Four running examples illustrate the approach. On the robustness side, algorithmic approximations to minimum covariance determinant (MCD) and least trimmed squares (LTS) estimation. And, on the diagnostic side, detection of multiple multivariate outliers and global diagnostic use of the likelihood displacement function. This last is developed here as a global complement to Cook’s (in J. R. Stat. Soc. 48:133–169, 1986) local analysis. Appropriate convergence of each branch of the algorithm is guaranteed for any target functional whose relaxed form is—in a natural generalisation of concavity, introduced here—‘gravitational’. Again, its descent strategy can downweight to zero contaminating cases in the starting position. A simulation study shows that, although not optimised for the LTS problem, our general algorithm holds its own with algorithms that are so optimised. An adapted algorithm relaxes the gravitational condition itself. [less ▲]

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See detailPeter Verhelst. Entre corps et rêve
Steyaert, Kris ULiege

Article for general public (2010)

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