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See detailHanche douloureuse de l'enfant sportif
Kaux, Jean-François ULg

Learning material (2011)

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See detailImpact of thresholding techniques on X-ray soil microtomogram analyses
Beckers, Eléonore ULg; Léonard, Angélique ULg; Beekkerk van Ruth, Jöran ULg et al

in Geophysical Research Abstracts (2011), 13

Using X-ray microtomography, 3D soil structure can be visualised and analysed through useful factors like pore size distribution, shape, connectivity, orientation, etc. X-ray scans yield grey-level 2D ... [more ▼]

Using X-ray microtomography, 3D soil structure can be visualised and analysed through useful factors like pore size distribution, shape, connectivity, orientation, etc. X-ray scans yield grey-level 2D images, which can be recombined to form 3D structures. Treatments of the grey-level images can consist of either a binarization -distinguishing soil and pores- or a permeability level attribution directly linked to the grey-level values. The latter leads to problems in order to assign a permeability for each point (in soil a same grey level value can be assigned to points with a different permeability), as well as to analyse the 3D structure. On the other hand, treatment of black and white 3D structures is well-handled. However, the impact of the choice of one thresholding technique on the resulting images has already been demonstrated. Moreover, thresholding methods are various and numerous. Many of them are based on the image histogram analysis. But because of the soil complexity, the relevance of these techniques becomes debatable, with a risk of producing non reliable images. We propose to palliate this with a simple new algorithm based on physical measurements: it uses a loop fixing the threshold value in order to match the measured porosity for each sample. In this communication, our point is to highlight the impact of different thresholding techniques on the analysis and interpretation of our soil microtomograms. The underlying questions could be: Does the thresholding method influence our conclusions? Are the results depending on the sample itself or on the methodology? In order to answer these questions we tested the Otsu technique and our physically based algorithm. Soils samples were removed from the upper layer (Ap horizon) of a silty soil (Gentinnes, Brabant Walloon, Belgium) in plots with different management practices. In fact, since 2004, the field has been cultivated in conventional tillage (CT) or reduced tillage (RT). In order to empty the meso- and macroporosity, samples were placed under a 1.5 MPa pressure (Richards apparatus). Samples were then scanned by X-ray microtomography using a Skyscan-1172 high-resolution desktop micro-CT system (Skyscan, Kontich, Belgium). The cone beam source operated at 100 kV, using an aluminium filter. The detector configuration, i.e. 1048x2000 pixels with a 16-bit X-ray camera, and the distance source-object-camera were adjusted to produce images with a pixel size of 17 µm. Porosity was measured for each scanned sample. Then the threshold methods -the Otsu technique on one hand and our developed algorithm on the other - were applied, and morphological factors were calculated for both methods. A comparison of the first results shows a threshold influence on average porosity and number of pores, but also on connectivity factors and size distribution. The apparent porosity of the images, as well as connectivity, is underestimated with the Otsu technique. Despite the fact that the changes induced by thresholding are more important for RT than CT, global conclusions about the comparison of these agricultural practices are approximately the same in this case. However, differences between tillage systems are less important with the Otsu method, confirming the impact of choosing the adapted threshold method. [less ▲]

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See detailObliged permanent pastures : main future of ruminant production in Belgium
Stilmant, Didier; Stassart, Pierre M ULg; Peeters, Pierre et al

in Grassland Science in Europe (2011), 16

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See detailCouverture de pertes de substance du tibia distal par lambeau pedicule perforant en helice : deux cas cliniques.
Bous, Aurélie ULg; Ronsmans, C.; NIZET, Jean-Luc ULg et al

in Annales de Chirurgie Plastique Esthetique (2011)

Distal lower leg soft tissue defect is frequently a challenge to repair, particularly on the tibial crest. The coverage of this kind of lesion has some limitations because of regional minimal blood supply ... [more ▼]

Distal lower leg soft tissue defect is frequently a challenge to repair, particularly on the tibial crest. The coverage of this kind of lesion has some limitations because of regional minimal blood supply and paucity of local soft-tissue flaps. The perforator pedicled propeller (PPP) method tries to find a new place in lower leg reconstruction in bringing similar tissues at the recipient site and avoiding long and difficult free flap transfer or muscular sacrifice. The authors report on the use of PPP method for a tibial crest exposure after trauma and for a soft tissue defect with osteomyelitis on the tibial crest. [less ▲]

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See detailCoûts et valeur ajoutée dans la commercialisation des perches de teck au Sud-Bénin
Aoudji, Augustin K. N.; Adégbidi, Anselme; Agbo, Valentin et al

in Cahiers Agricultures (2011), 20(6 (Novembre-Décembre 2011)), 480-486

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See detailExiste-t-il des communautés sur Internet ? La réponse de trois études du mouvement du logiciel libre
Lejeune, Christophe ULg

in Actes des travaux du comité de recherche « Sociologie de la communication » (2011)

L'Open Directory Project, Debian et Wikipedia sont trois collectifs issus du mouvement du logiciel libre. Leur comparaison permet de dégager les traits communs et les différences d'organisation sociale de ... [more ▼]

L'Open Directory Project, Debian et Wikipedia sont trois collectifs issus du mouvement du logiciel libre. Leur comparaison permet de dégager les traits communs et les différences d'organisation sociale de ces trois collectifs médiatisés par la technologie.Nous examinons dans quelle mesure ces éléments empiriques s'accordent avec les définitions classiques de communauté (fut-elle virtuelle). Nous interrogeons dès lors l'opportunité de caractériser ces phénomènes au moyen d'une telle notion et identifiant deux alternatives : soit modifier les définitions classiques, soit proposer de nouvelles notions. Finalement, nous proposons la notion plus adéquate de collectifs médiatisés orientés vers un projet. [less ▲]

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See detailMolecular data challenge traditional subgeneric divisions in the leafy liverwort Radula
Devos, Nicolas; Renner, MAM; Gradstein, SR et al

in Taxon (2011), 60

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See detailA coupled two-scale computational scheme for periodic quasi-brittle thin planar shell failure
Mercatoris, Benoît ULg; Massart, Thierry J.

Conference (2011)

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See detailAnalyse comparative de la flore de la forêt dense de Kigwena et de la forêt claire de Rumonge au Burundi
Hakizimana, P; Bangirimana, F; Habonimana, B et al

in Bulletin Scientifique de l'Institut National pour l'Environnement et la Conservation de la Nature (INECN) (2011), 9

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See detailEditorial : Questionner le tourisme rural
Schmitz, Serge ULg; Decroly, Jean Michel

in Schmitz, Serge; Decroly, Jean Michel (Eds.) Questionner le tourisme rural (2011)

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See detailZu den Grenzen des EuroCom-Konzeptes für EuroComGerm - Zwischenfazit
Berthele, Raphael; Colliander, Peter; Duke, Janet et al

in Pöckl, Wolfgang; Ohnheiser, Ingeborg; Sandrini, Peter (Eds.) Translation – Sprachvariation – Mehrsprachigkeit: : Festschrift für Lew Zybatow zum 60. Geburtstag (2011)

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See detailThe Ri chicken breed and livelihoods in North Vietnam: characterisation and prospects
Moula, Nassim ULg; Do Duc, Luc ULg; Pham Kim, Dang et al

in Journal of Agriculture and Rural Development in the Tropics and Subtropics (2011), 112(1), 57-69

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See detailL’ikhtilâf, l’autre principe de l’islam. Une entrée pour penser le compromis en contextes islamiques
Nachi, Mohamed ULg

in Nachi, Mohamed (Ed.) Les figures du compromis dans les sociétés islamiques. Perspectives historiques et socio-anthropologiques (2011)

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See detailDuden - Deutsches Universalwörterbuch
Auberle, Anette; Eickhoff, Birgit; Haller-Wolf, Angelika et al

Book published by Dudenverlag - 7ème éd. (2011)

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See detailArsenic-doped Ge-spiked monoemitter SiGe:C HBTs by means of low-temperature trisilane based epitaxy
You, Shuzhen; Decoutere, Stefaan; Nguyen, Ngoc Duy ULg et al

Conference (2011)

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