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See detailPrenatal diagnosis of benign extreme hyperlordosis.
Chantraine, Frédéric ULg; Tutschek, Boris; Senterre, Thibault ULg et al

in Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine (2009), 28(8), 1097

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See detailGeometric Study of Mixed-integer Sets from Two Rows of Two Adjacent Simplex Bases
Louveaux, Quentin ULg

Conference (2009, August)

We generalize the study of sets arising from two rows of a simplex tableau by considering bounds on the nonbasic variables. We show that new classes of facets arise that cannot be obtained from triangles ... [more ▼]

We generalize the study of sets arising from two rows of a simplex tableau by considering bounds on the nonbasic variables. We show that new classes of facets arise that cannot be obtained from triangles and quadrilaterals. Specifically, when exactly one upper bound on a non-basic variable is introduced, inequalities that can be derived from pentagons involving up to six variables also appear. [less ▲]

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See detailHiggs Exclusive Production
Dechambre, Alice ULg

Poster (2009, August)

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See detailPractical Methods for Measuring the Tortuosity of Porous Materials from Binary or Gray-Tone Tomographic Reconstructions
Gommes, Cédric ULg; Bons, Anton-Jan; Blacher, Silvia ULg et al

in AIChE Journal (2009), 55(8), 2000-2012

Two practical methods are proposed to measure the tortuosity of a porous or permeable material from its tomographic reconstruction. The first method is based on the direct measurement of the shortest ... [more ▼]

Two practical methods are proposed to measure the tortuosity of a porous or permeable material from its tomographic reconstruction. The first method is based on the direct measurement of the shortest distance between two points in the pores, and the second is based on the geodesic reconstruction of the pore or permeation space. Unlike the first method, the second can be directly applied to gray-tone tomograms, without the need of a segmentation step. The methods are illustrated with an electron tomogram of clay/plastic nanocomposite, an X-ray microtomogram of sandstone, and a series of model morphologies consisting of penetrable random spheres. For the latter series, the measured tortuosities compare very well with those derived independently from the theoretical effective diffusion coefficients [less ▲]

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See detailPotential of Dried Egg Yolk as a Source of Immunoglobulins to Control Salmonella in the Gastrointestinal Tract of the Broiler Chicken
Marcq, Christopher ULg; Portetelle, Daniel ULg; Chalghoumi, RAJA ULg et al

in 17th European Symposium on Poultry Nutrition : Proceedings & Abstracts (2009, August)

Egg yolk immunoglobulins (IgY) are considered as a promising tool of establishing passive immunity against enteric pathogens (e.g. Salmonella) in poultry (Kovacs-Nolan and Mine, 2005). In our previous ... [more ▼]

Egg yolk immunoglobulins (IgY) are considered as a promising tool of establishing passive immunity against enteric pathogens (e.g. Salmonella) in poultry (Kovacs-Nolan and Mine, 2005). In our previous works, in-feed incorporation of freeze-dried yolk powder (FYP) improved performances of Salmonella-infected broilers (Marcq et al., 2009). Nevertheless, no extra value could be attributed to the presence of specific IgY when a comparison was done between impact of hyperimmune or non immune FYP both concerning growth performances and Salmonella infection. We hypothesized that these inconclusive in vivo results were related to the sensitivity of IgY to gastrointestinal conditions. Egg yolks with high IgY titers directed against Salmonella Enteritidis and Typhimurium were obtained from laying hens immunized as previously described (Chalghoumi et al., 2008). Three feed additives derived from these eggs were produced: FYP, spray-dried yolk powder (SYP), and freeze-dried water-soluble fraction of yolk powder (WSFP). A force-feeding assay was realized on these additives with 48 five-week-old males Ross broiler chicken (Salmonella spp.-free status). Survival of undigested IgY and bioactive Fab fragments was evaluated in the intestinal tract by ELISA. Statistical analyses were done using GLM procedure of Minitab 15.1. Software. Differences were considered significant when P<0.05. As a result of the digestive process, the levels of total and specific undigested IgY found throughout the intestine were dramatically reduced for the three additives. For FYP, no difference was observed with intestinal contents of control animals (P>0.05) and for WSFP, which correspond to semi-purified IgY, the immunological activity reached the same level than that for SYP (P>0.05) whereas its initial level was almost ten times higher. The results suggest a protective effect of whole yolk on IgY with SYP but such effect was not observed with FYP. High levels of Fab fragments were identified in intestinal contents, highlighting the importance of protein digestion in the digestive tract and especially pepsin digestion. These Fab fragments conserve their immunological functionality and remained detectable in all intestinal segments including the caecum which represents the major site of Salmonella infection in poultry. These results can explain our previous challenge data and reveal that a protection treatment should be applied to dried egg yolk to improve the resistance of IgY to gastrointestinal conditions in broilers. [less ▲]

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See detailCrystal plasticity prediction of Lankford coefficient using the MULTISITE model: influence of the critical resolved shear stresses
Hammami, Walid ULg; Delannay, Laurent; Duchene, Laurent ULg et al

in International Journal of Material Forming (2009, August), 2(Supplément 1), 65-68

The MULTISITE model [1] is based on polycrystalline plasticity and the underlying hypotheses of the model are (i) that the deformation of each grain is significantly influenced by the interaction with a ... [more ▼]

The MULTISITE model [1] is based on polycrystalline plasticity and the underlying hypotheses of the model are (i) that the deformation of each grain is significantly influenced by the interaction with a limited number of adjacent grains, and (ii) that local strains deviate from their macroscopic average according to specific “relaxation modes”. The LAMEL model [2] is reformulated into the more general elastic-viscoplastic MULTISITE model permitting various relaxation modes. This model has been validated for cubic materials but hexagonal close-packed (HCP) crystals usually demonstrate larger anisotropy than cubic crystals. The model was used to simulate uniaxial tensile tests performed on rolled sheets made of Ti-6Al-4V. The Lankford coefficients (r) calculated in various directions in the plane of the sheet were analysed. In this study, different grain interaction hypotheses were tested. Besides, it appeared that the value of the critical resolved shear stresses (CRSS) of the different slip system families of the HCP metal had significant effects on the results. Their influence as well as the influence of the strain rate sensitivity parameter was examined. [less ▲]

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See detailTransfer of heroin profiling method from conventional GC-MS to Fast-GC-MS and UHPLC-MS/MS
Debrus, Benjamin ULg; Broséus, Julian; Guillarme, Davy et al

Conference (2009, August)

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See detailGenetic evaluation considering phenotypic data and limited molecular information using a novel equivalent model: Case study using effect of the mh locus on milk production in the dual-purpose Belgian Blue breed
Colinet, Frédéric ULg; Gengler, Nicolas ULg

Conference (2009, August)

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the ... [more ▼]

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. However, all animals could not be genotyped. Thus, the developed equations were modified to allow the integration of the known genotype for a portion of the population. This strategy was tested for the mh locus (responsible for the double-muscling phenotype) in dual-purpose Belgian Blue cattle. The genotype was determined for 123 bulls and 1940 cows (+/+ 19.5, mh/+ 39.3 and mh/mh 41.2%). These animals had 11,150 daughters with test-day (TD) records. The genotypes were incorporated into a modified genetic evaluation based on the current routine multi-trait multibreed test-day model used in the Walloon Region (Belgium). Data used included 12,829,309 TD records for 689,057 dairy cows in production. The pedigree file contained 1,606,024 animals (cows with TD records and ancestors). Computation of the modified mixed model equations was done solving iteratively two systems of equations, one for the polygenic effects and one for the gene effect until the relative differences in the gene solutions were below 10-5. A linear extrapolation was also used to speed up the convergence of gene effects. As expected, the mh locus exerts negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -158.7 kg milk, -8.93 kg fat and -5.64 kg protein per lactation (305 days). [less ▲]

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See detailInnovative development and validation of an HPLC/DAD method for the qualitative and quantitative determination of major cannabinoïds in cannabis plant material
De Backer, Benjamin ULg; Debrus, Benjamin ULg; Lebrun, Pierre ULg et al

Poster (2009, August)

GC is commonly used for the analysis of cannabis samples, e.g. in forensic chemistry. However, as this method is based on heating of the sample, acidic forms of cannabinoids are decarboxylated into their ... [more ▼]

GC is commonly used for the analysis of cannabis samples, e.g. in forensic chemistry. However, as this method is based on heating of the sample, acidic forms of cannabinoids are decarboxylated into their neutral counterparts. Converely, HPLC permits the determination of the original composition of plant cannabinoids by direct analysis. Several HPLC methods have been described in the literature, but most of them failed to separate efficiently all the cannabinoids or were not validated according to general guidelines. By use of an innovative methodology for modelling chromatographic responses, a simple and accurate HPLC/DAD method was develop [less ▲]

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See detailRhétorique
Provenzano, François ULg

in Grassin, Jean-Marie (Ed.) Dictionnaire international des termes littéraires [en ligne] (2009)

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See detailPratiques réflexives en didactique des Langues et littératures modernes à l'ULg : description, évaluation, perspectives.
Simons, Germain ULg; Delbrassine, Daniel ULg; Pagnoul, Pierre ULg et al

in Puzzle (2009), (26), 20-27

Dans cet article, nous définissons d'abord brièvement la notion de "réflexion sur l'action" et soulignons l'intérêt d'une telle démarche dans la formation initiale des enseignants. Ensuite, nous décrivons ... [more ▼]

Dans cet article, nous définissons d'abord brièvement la notion de "réflexion sur l'action" et soulignons l'intérêt d'une telle démarche dans la formation initiale des enseignants. Ensuite, nous décrivons, commentons et évaluons les différentes activités que nous avons conçues pour amener les étudiants de l'AESS/du Master à finalité didactique en Langues et littératures modernes de l'ULg à devenir des "praticiens réflexifs" (Schön, 1988) ou du moins à s'approcher de cet idéal. Enfin, nous proposons quelques pistes pour améliorer le dispositif mis en place. [less ▲]

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See detailOn input-to-output stability of switched non-exponentially stable nonlinear systems
Efimov, Denis ULg; Panteley, Elena; Loria, Antonio

in Proc. European Control Conference, Budapest (2009)

The problem of input-to-output stability for switched nonlinear systems is considered. Two approaches for switching between non-exponentially stable systems are proposed guaranteeing input-to-output ... [more ▼]

The problem of input-to-output stability for switched nonlinear systems is considered. Two approaches for switching between non-exponentially stable systems are proposed guaranteeing input-to-output stability for the switched system. [less ▲]

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See detailHybrid robust observers for locally Lipschitz systems
Bobtsov, Alexey; Efimov, Denis ULg

in Proc. European Control Conference, Budapest (2009)

State observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach ... [more ▼]

State observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach applicable to nonlinear systems with bounded solutions. [less ▲]

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See detailComparison of bovine colostrum whey and defatted bovine colostrum supplementation on piglet post-weaning growth check
Boudry, Christelle ULg; Gauthier, Vincent ULg; Buldgen, André

in Book of the Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

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See detailEffect of bovine colostrums of 1st, 2nd and 3rd milking on growth performance and the immune system of newly-weaned piglets after an E. coli LPS challenge
Gauthier, Vincent ULg; Boudry, Christelle ULg; Buldgen, André

in Book of the Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

Detailed reference viewed: 31 (8 ULg)