References of "2012"
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See detailLe "style" de Heidegger - entre éducation, philosophie et politique
Pieron, Julien ULg

Scientific conference (2012, April 11)

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See detailMagnetic shielding properties of a cut superconducting hollow cylinder : modelling and experiment
Vanderbemden, Philippe ULg; Elschner, Steffen; Hobl, A et al

Conference (2012, April 11)

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See detailOptimisation 3D du chargement de conteneurs pour le transport aérien
Paquay, Célia ULg; Limbourg, Sabine ULg; Schyns, Michael ULg

in LigéRO (Ed.) Proceedings ROADEF 2013 (2012, April 11)

De nos jours, décider comment remplir des conteneurs avec des colis est une activité courante aussi bien dans le domaine du transport routier qu’aérien. Ce type de question est apparentée aux problèmes de ... [more ▼]

De nos jours, décider comment remplir des conteneurs avec des colis est une activité courante aussi bien dans le domaine du transport routier qu’aérien. Ce type de question est apparentée aux problèmes de Bin-Packing(BPP) en recherche opérationnelle. En termes économiques, ces opérations doivent mener à une solution qui satisfait de nombreuses contraintes physiques, être réalisées rapidement et de sorte à maximiser certains critères. Typiquement, on tentera de charger un maximum de colis dans un minimum de conteneurs pour réduire les coûts. [less ▲]

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See detailOn the accurate selection of asymptotic detection thresholds for Infit and Outfit indexes of person fit
Magis, David ULg; Raîche, Gilles; Béland, Sébastien

Conference (2012, April 11)

It exists a bunch of person fit indexes but Lz (Drasgow, Levine, & Williams, 1985), Infit mean square W (Wright & Masters, 1982) and Outfit mean square U (Wright & Stone, 1979) are certainly the most ... [more ▼]

It exists a bunch of person fit indexes but Lz (Drasgow, Levine, & Williams, 1985), Infit mean square W (Wright & Masters, 1982) and Outfit mean square U (Wright & Stone, 1979) are certainly the most popular. However, they have the undesirable property that their limiting distribution depends on the true ability level, which is generally unknown. In addition, the asymptotic distribution of U and W indexes was not clearly stated. Snijders (2001) proposed a generalization of the index Lz to incorporate estimated ability levels in its computation, and derived subsequent asymptotic normality of this modified Lz* index. The purpose of this talk is threefold. First, the generalization of Lz to Lz* is briefly sketched. Second, it is shown how this generalization can be successfully applied to both U and W indexes, yielding generalized U* and W* indexes respectively. Third, the accuracy of generalized indexes in detecting person (mis)fit is assessed through a simulation study. Three situations were investigated: (a) absence of misfit; (b) presence of cheating (yielding spuriously high scores); (c) presence of inattention (yielding spuriously low scores). Several conditions were varied, such as test length and aberrance rates when misfit was introduced. Response patterns were generated under the Rasch model and maximum likelihood estimation was performed to obtain the ability estimates. Several significance levels were selected. It is observed, that the generalized indexes Lz*, U* and W* better recover the significance level than their standard alternatives Lz, U and W respectively, while they are more powerful in identifying the two types of person misfit. In particular, the modified index W* has the best improvement in performance with respect to its original version W. It is concluded that Snijders' generalization of Lz index to Lz* is also accurate for U and W indexes under Rasch modelling. Possible extensions to other person fit indexes, such as ECI indexes (Tatsuoka, 1984), other ability estimators, and other IRT models are eventually briefly discussed. [less ▲]

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See detailClimat: nous n'avons pas de temps à perdre
Berger, A; Callens, I; Bouckaert, T et al

Article for general public (2012)

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See detailTiO2 templated multilayer films used as high efficiency photoelectrode in liquid or solid DSSCs
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Mathis, François ULg et al

Conference (2012, April 10)

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes ... [more ▼]

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes with a thickness of 10-15 µm. Templated-assisted dip-coating techniques are used to obtain thin films with ordered porosity. However, monolayer films prepared by dip-coating from a solution suffer from a low quantity of active material with a limited surface area, leading to poor photovoltaic performances. Therefore a multilayer deposition process is needed to increase the film thickness along with surface area. Multilayer dip-coating procedures have already been reported but are usually characterized by a lack of linearity in the evolution of parameters (roughness, surface area, PV performances) as the number of layer increases. In this study, we investigate a dip-coating-based multilayer deposition technique delaying these limitations. First, the influence of the template on the film organization and porosity is studied in terms of long-range order, percentage of porosity, pore size, surface area and pores connectivity. Different techniques such as transmission electron microscopy (TEM), atmospheric poroellipsometry (AEP) and UV-visible absorption spectroscopy (UV-vis.) have been used to describe the microstructural features of the films. The film exhibiting the highest dye loading was selected and its thickness gradually increased up to 4 µm. Finally, the photovoltaic performances of the thick films (1 to 4 µm) have been evaluated in combination with the N719 dye and a liquid electrolyte and show excellent efficiency (6.1%) when compared to values reported in the literature. Such mesostructured films were compared in terms of photovoltaic performance with TiO2 nanoparticles films, generally used in DSSC. Films were further evaluated by Rutherford Backscattering Spectrometry (RBS) as high performance photoelectrode in solid-state DSSCs, in combination with Z907 dye and Spiro-OMeTAD as solid electrolyte. [less ▲]

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See detailInvestigation of nanoparticles as potential activators for the optimization of PAH biodegradation
Masy, Thibaut ULg; Wannoussa, Wissal ULg; Lambert, Stéphanie ULg et al

Poster (2012, April 10)

These last decades, through the industrial development and its imperfect waste management, the contamination by hydrocarbons in water and soils has led to a progressive deterioration of environmental ... [more ▼]

These last decades, through the industrial development and its imperfect waste management, the contamination by hydrocarbons in water and soils has led to a progressive deterioration of environmental quality, which is more and more considered nowadays. Amongst all the existing cleaning-up techniques, the bioremediation appears as the best compromise between treatment costs and effectiveness. However, this bioprocess remains time-consuming, especially for persistent pollutants as PAHs (Polycyclic Aromatic Hydrocarbons). A first way to improve the biodegradation consists in adding a consortium of efficient microorganisms in the polluted area (bioaugmentation). A further way to improve the bioremediation rate is based on the use of nutrients to assist the microbial metabolism (biostimulation). Our project gathers these two methods, specifically for the PAH biodegradation of polluted soils. Firstly, different suitable strains from our lab will be compared together in terms of PAH-degrading rate, in order to select the best microorganisms. As all these strains were selected from a long-term oil-polluted dried soil, they should be able to compete against the endogenous microflora, even if they are injected in the soil in a powdered starter. Secondly, trace elements in the nanoparticulate form, with concentrations of about 10-5M, will be added to catalyze the bacterial metabolism. First results already showed a sharp increase (2 to 3 fold) in the biodegradation kinetics, which is promising for the further scaling-up stages. In addition, this PhD project attempts to understand the mechanism of interaction between bacteria and nanoparticulate catalysts. [less ▲]

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See detailRéponses du Martin-pêcheur huppé Alcedo cristata à la perturbation de ses sites de nidification
Kisasa Kafutshi, Robert

in Malimbus (2012), 34

From 2004 to 2009, two colonies of Malachite Kingfisher were monitored by ringing the nestlings and adults, counting eggs and observing parental activity at the nests. Results show that 10 % of nests were ... [more ▼]

From 2004 to 2009, two colonies of Malachite Kingfisher were monitored by ringing the nestlings and adults, counting eggs and observing parental activity at the nests. Results show that 10 % of nests were destroyed by people in the Symphonies site as against 78 % in the Monastery site. Consequently, the number of nests available for breeding is lower at Monastery than at Symphonies. The number of fledged chicks per nest at Symphonies was twice that at the Monastery. Site fidelity is higher for the adults in the Symphonies site (26 %) than at the Monastery (11 %). This suggests that the Monastery site is less favourable to the survival of the Malachite Kingfisher than the Symphonies site. The best strategy to protect this species seems to be the maintenance of a good number of nesting sites. [less ▲]

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See detailDécouverte d’un nouveau cycle du climat
Mabille, Georges ULg; Nicolay, Samuel ULg

Article for general public (2012)

L'outil mathématique "transformée en ondelettes" est appliqué ici à des séries de températures de l'air au sol et met en évidence un cycle de l'ordre de 30 mois. Ce cycle s’observe sur une part importante ... [more ▼]

L'outil mathématique "transformée en ondelettes" est appliqué ici à des séries de températures de l'air au sol et met en évidence un cycle de l'ordre de 30 mois. Ce cycle s’observe sur une part importante de la surface de la planète. [less ▲]

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See detailStudy of the portals of entry of Cyprinid herpesvirus 3 in Cyprinus carpio
Fournier, Guillaume ULg

Doctoral thesis (2012)

The common carp is one of the most important freshwater species in aquaculture and its colourful subspecies koi is grown for personal pleasure and exhibitions. Both subspecies are economically important ... [more ▼]

The common carp is one of the most important freshwater species in aquaculture and its colourful subspecies koi is grown for personal pleasure and exhibitions. Both subspecies are economically important. In the 1990s, a highly contagious and lethal pathogen called koi herpesvirus (KHV) or cyprinid herpesvirus 3 (CyHV-3) began to cause severe financial losses in these two carp industries worldwide. Because of its economic importance and its numerous original biological properties, CyHV 3 became rapidly an attractive subject for applied and fundamental research. The goal of this thesis was to identify the portals of entry of CyHV-3 in carp. This information is essential to understand the pathogenesis and the epidemiology of the infection, but also to develop efficacious vaccines. Prolonged CyHV-3 cultivation in vitro leads to the spontaneous attenuation of the virus. To circumvent this problem, the entire viral genome was cloned as a bacterial artificial chromosome (BAC). Then to test the usefulness of the BAC clone, several recombinants strains were generated as described in the first chapter. In the second chapter, we took profit of the CyHV-3 BAC clone to produce a recombinant strain encoding a firefly luciferase (LUC) expression cassette. Infection of carp by immersion in water containing the CyHV-3 LUC strain demonstrated, using bioluminescent in vivo imaging system (IVIS), that the skin, and not the gills, is the major portal of entry for CyHV-3. Fish skin provides mechanical, chemical and immune protection against injury and pathogenic microorganisms. Its mucus layer confers an innate immune protection against pathogen entry. However, there is little in vivo evidence on the role of skin mucus as a first line of innate immune protection against bacterial and viral infections. In the third chapter, we used the CyHV-3 LUC strain and IVIS to investigate the roles of epidermal mucus as an innate immune barrier against CyHV-3 entry. Our results demonstrate that the mucus of the skin inhibits CyHV-3 binding to epidermal cells and contains soluble molecules able to neutralize CyHV-3 infectivity. The skin is the major portal of entry after inoculation by immersion in water containing CyHV-3. While this model of infection mimics some natural conditions in which infection takes place, other epidemiological conditions could favor entry of virus through the digestive tract. Consequently, in the fourth and last chapter, we investigated the role of the carp digestive tract as a viral portal of entry using bioluminescence imaging. We found that feeding carp with infectious materials induces CyHV-3 entry through infection of the pharyngeal periodontal mucosa. In conclusion, this study demonstrated that according to epidemiological conditions, CyHV-3 can enter carp either through infection of the skin (immersion in infectious water) or through infection of the pharyngeal periodontal mucosa (feeding on infectious materials). The existence of these two portal of entry adapted to different epidemiological conditions most probably contributes to the high contagious nature of the virus. [less ▲]

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See detailL'interprétation réaliste des jugements existentiels de Conrad-Martius
Seron, Denis ULg

Conference (2012, April 06)

Hedwig Conrad-Martius a développé, dans les années 1930, une conception en grande partie originale du jugement existentiel, dans la perspective d’une ontologie d’allure aristotélicienne. L’idée à la base ... [more ▼]

Hedwig Conrad-Martius a développé, dans les années 1930, une conception en grande partie originale du jugement existentiel, dans la perspective d’une ontologie d’allure aristotélicienne. L’idée à la base de cette conception est que l’être existentiel et l’être copule sont unis par une relation d’analogie, et que celle-ci doit servir de principe directeur pour la clarification des « sens de l’être ». Cette idée a conduit Conrad-Martius à élaborer une théorie assez sophistiquée de l’« être immanent à l‘état de choses », ainsi qu’une conception réaliste suivant laquelle le prédicat existentiel exprime une propriété de premier degré, qui doit être mise au jour par l’intuition des essences. On s’attachera non seulement à détailler son analyse du jugement existentiel, en remontant à ses sources chez Reinach, Pfänder et, indirectement, chez Meinong, mais aussi à en clarifier quelques implications métaphysiques. [less ▲]

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See detailAPA@ULg : les normes de l'A.P.A. (American Psychological Association)
Thirion, Paul ULg; Durieux, Nancy ULg

Learning material (2012)

Site destiné à expliquer les principales règles de l'American Psychological Association (APA) en matière de citations, de présentation de la liste des références et de présentation des tableaux et figures ... [more ▼]

Site destiné à expliquer les principales règles de l'American Psychological Association (APA) en matière de citations, de présentation de la liste des références et de présentation des tableaux et figures dans un document scientifique. Le site comporte une série d'exemples et quelques adaptations au contexte francophone. [less ▲]

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See detailDifferential usage of NF-kB activating signals by IL-1b and TNF-a in pancreatic beta cells
Ortis, Fernanda; Miani, M; Colli, ML et al

in FEBS Letters (2012), 586

The cytokines interleukin (IL)-1b and tumor necrosis factor (TNF)-a induce b-cell death in type 1 diabetes via NF-kB activation. IL-1b induces a more marked NF-kB activation than TNF-a, with higher ... [more ▼]

The cytokines interleukin (IL)-1b and tumor necrosis factor (TNF)-a induce b-cell death in type 1 diabetes via NF-kB activation. IL-1b induces a more marked NF-kB activation than TNF-a, with higher expression of genes involved in b-cell dysfunction and death. We show here a differential usage of the IKK complex by IL-1b and TNF-a in b-cells. While TNF-a uses IKK complexes containing both IKKa and IKKb, IL-1b induces complexes with IKKa only; this effect is achieved by induction of IKKb degradation via the proteasome. Both IKKg and activation of the TRAF6-TAK1-JNK pathway are involved in IL-1b-induced IKKb degradation. [less ▲]

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See detailCharacterisation of macadamia nuts using X-ray microtomography
Plougonven, Erwan ULg; Srichamnong, Warangkana; Srzednicki, George et al

in Micro-CT User Meeting Abstract Book (2012, April 05)

Macadamia nuts are among the most nutritious and highest in monounsaturated oil content among edible nuts1. They are widely grown in Australia (46 % of total production), United States of America ... [more ▼]

Macadamia nuts are among the most nutritious and highest in monounsaturated oil content among edible nuts1. They are widely grown in Australia (46 % of total production), United States of America, especially in Hawaii, South Africa and Guatemala2. In practice, there are several steps involved in macadamia processing, including sorting and grading, drying, cracking, roasting, packaging and storage. Drying is a very crucial step as it needs to preserve macadamia quality as well as enhance storage stability through the reduction of water activity. It is obvious that physical properties of the nut contribute to its drying characteristics, and hence its storage stability. Accurate measures such as kernel volume ratio or shell density could help for improving drying efficiency. We present a methodology to investigate structural differences between varieties of macadamia nuts in order to understand the factors involved in storage stability. Fresh nuts-in-shell are scanned by X-ray microtomography, and the different parts of the nuts (shell, kernel, tracheids) are segmented by a set of classical 3D image operators. After image segmentation, volumes are determined, and additional weighing of the nuts allows density measurements. These quantities are plotted for several nuts from each variety. [less ▲]

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See detailRaymond De Becker et l'identité belge
Lanneau, Catherine ULg

Conference (2012, April 05)

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See detailLa lutte contre les abus passe par l'Union européenne
Defossez, Alexandre ULg

Article for general public (2012)

Le drame de Wingene, dans lequel deux chauffeurs routiers polonais ont tragiquement perdu la vie, a jeté une lumière crue sur les conditions de travail parfois déplorables de certains travailleurs issus ... [more ▼]

Le drame de Wingene, dans lequel deux chauffeurs routiers polonais ont tragiquement perdu la vie, a jeté une lumière crue sur les conditions de travail parfois déplorables de certains travailleurs issus des pays de l’Est. [less ▲]

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