References of "Scientific congresses and symposiums"
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See detailA pressure dependent bone remodeling model for application in orthodontics
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in XXIInd Congress of the International Society of Biomechanics (2009)

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See detailQuel dispositif de formation pour un CDS ? Réflexions à partir de l’expérience de l’Académie Wallonie-Europe
Merenne-Schoumaker, Bernadette ULg; Leduc, Laurent ULg

Conference (2009)

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the ... [more ▼]

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the purpose of this article is to reflect on the specificities and constraints of a training limited to teachers in charge of First Generation students, those specificities being especially constraining since the CDS training sessions take place in a larger context : the training of all the university teachers. The Liege experience enlightens some determinant factors : sensitizing first on the interest of such a training, centring the training on close coaching of students learning with a focus on their difficulties or deficiencies and with help given to teachers in resolving them, meeting the diversity of the situations lived by those teachers (notably in terms of students number and disciplines), taking into account their expectations in accordance with their profile, cleverly combining oral speeches, testimonies and debates, suggesting a diversity of concrete intervention trails… By the way, the joined organization of introduction sessions and close coaching seminars seems to be a relevant formula in order to meet such kind of objectives. [less ▲]

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See detailÉlections collectives d’un "Patron et Protecteur". Mises en scène jésuites dans les Pays-Bas espagnols
Delfosse, Annick ULg

in Dompnier, Bernard (Ed.) Les cérémonies extraordinaires du catholicisme baroque (2009)

The A. studies the phenomenon of the civic elections of a patron saint in the Spanish Low Countries, after the process definition by the Congregation of Rites in 1630. She takes an interest mainly in the ... [more ▼]

The A. studies the phenomenon of the civic elections of a patron saint in the Spanish Low Countries, after the process definition by the Congregation of Rites in 1630. She takes an interest mainly in the ceremonial dimensions of these consecrations that give rise to solemnities noticeable by their dramaturgy. In a war context, these elections answer to the anxiety by an overactive energy resulted in a luxuriant and opulent scenery. Life’s highlights of cities in crisis, they prove an exacerbate expressivity and a strong inventiveness. Their study must excite the curiosity of the historian who questions the mechanisms of the solennisation of the Tridentine cult, the part given to the emotion in the expression of the Sacred and the processes invented to create a strong affective adhesion to the message that these ceremonies suggest. Are particularly studied the cases of Lille (1634), Aire-sur-la-Lys (1636), Armentières (1664), Luxembourg (1666 and 1678), Stadtkyll (1679) and Baasen (1682). [less ▲]

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See detailStudy of diffusive limitations in Proton Exchange Membrane Fuel Cells (PEMFC)
Brigaudet, Mathilde; Berthon-Fabry, Sandrine; Beauger, Christian et al

in Proceedings of the International Carbon Conference 2009 (2009)

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See detailTopology Optimization of Structural Components: A Multibody Dynamics-Oriented Approach
Bruls, Olivier ULg; Lemaire, Etienne ULg; Duysinx, Pierre ULg et al

in Proceedings of the Multibody Dynamics ECCOMAS Conference (2009)

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. Generally, topology optimization techniques consider that the structural ... [more ▼]

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. Generally, topology optimization techniques consider that the structural component is isolated from the rest of the mechanism and use simplified quasi-static load cases to mimic the complex loadings in service. In contrast, this paper proposes an optimization procedure based on the dynamic simulation of the full multibody system with large amplitude motions and elastic deflections. We show that the simulation model, which involves a nonlinear finite element formulation, a time integration scheme and a sensitivity analysis, can be efficiently exploited in an optimization loop. The method is applied to truss structural components. Each truss is represented by a separate structural universe of beams with a topology design variable attached to each one. A SIMP model (or a variant of the power law) is used to penalize intermediate densities. The optimization formulation is stated as the minimization of the mean compliance over a time period or as the minimization of the mean tip deflection during a given trajectory, subject to a volume constraint. In order to illustrate the benefits of the integrated design approach, the case of a two degrees-of-freedom robot arm is developed. [less ▲]

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See detailExperimental study of a river biofilm growth on artificial cobbles in contrasted flow conditions
Moulin, F.; Peltier, Yann ULg; Pen, C. et al

in International Workshop on Environmental Hydraulics (2009)

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See detailProduction of four amyloidogenic variants of human lysozyme as inclusion bodies in Escherichia coli
Dumont, Janice ULg; Menzer, Linda ULg; Scarafone, Natacha ULg et al

Poster (2009)

Six variants of human lysozyme (I56T, F57I, W64R, D67H, F57I/T70N and W112R/T70N) are associated with a hereditary non-neuropathic systemic amyloidosis. This disease involved an extra cellular deposition ... [more ▼]

Six variants of human lysozyme (I56T, F57I, W64R, D67H, F57I/T70N and W112R/T70N) are associated with a hereditary non-neuropathic systemic amyloidosis. This disease involved an extra cellular deposition of amyloid fibrils made of lysozyme variants in a wide range of organs such as liver, spleen and kidneys [1]. The characterisation at the molecular level of two variants, I56T and D67H, has shown that these mutations reduce the stability and more particularly the global cooperativity of the protein. Consequently, under physiologically relevant conditions, these variants can transiently populate a partially unfolded state in which the beta-domain and the C-helix are cooperatively unfolded while the rest of the protein remains native like [1]. The formation of intermolecular interactions between the regions that are unfolded in this intermediate state is likely to be a fundamental trigger of the aggregation process that ultimately leads to the formation and deposition of fibrils in tissues. In order to study the effects of the other amyloidogenic mutations on the properties of lysozyme and thus to get more insight in the mechanism of amyloid formation, it is necessary to produce them in large quantities. The D67H, I56T and F57I variants are currently produced in Aspergillus niger; the expression in this organism is, however, time consuming and the yield is very low. The attempts to use alternative systems such as Pichia pastoris [2], Saccharomyces cerevisiae, and Arabidopsis thaliana have not been conclusive so far. In this work, we have produced the four single-point lysozyme variants as inclusion bodies in Escherichia coli and explored the possibility to refold them. [1] Dumoulin & al., (2006) Acc. Chem. Res., 39, 603 - 610 [2] Kumita & al., (2006) FEBS J., 273, 711-720 [less ▲]

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See detailNormalizing speech transcriptions for Natural Language Processing
Dister, Anne; Constant, Matthieu; Purnelle, Gérald ULg

in Proceedings of the 3rd International Conference on Spoken Communication (GSCP'09) (2009)

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See detailSociologie post-critique et approche post-rawlsienne de la justice. Pour une théorie englobante du sens de la justice
Nachi, Mohamed ULg

in M. Breviglieri, Cl. Lafaye et D. Trom (Ed.) Compétences critiques et sens de la justice. Colloque de Cerisy (2009)

Il s'agit de comparer les théories de la justice à la sociologie pragmatique du juste pour montrer l'intérêt de cette dernière pour la compréhension du sens ordinaire de la justice

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See detailGrain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties
Vanderbemden, Philippe ULg; Vertruyen, Bénédicte ULg; Ausloos, Marcel ULg et al

in Journal of Optoelectronics and Advanced Materials [= JOAM] (2009), 11(9), 1115-1121

In the first part of this paper, we discuss the effects of grain boundaries on the properties of bulk colossal magnetoresistive (CMR) manganites We compare the electrical resistivity and AC magnetic ... [more ▼]

In the first part of this paper, we discuss the effects of grain boundaries on the properties of bulk colossal magnetoresistive (CMR) manganites We compare the electrical resistivity and AC magnetic susceptibility of perovskite La-Ca-Mn-O samples with the same nominal stoichiometry but differing in their microstructure (i) a single grain sample, (ii) a sample containing two grains and (iii) a polycrystalline sample Emphasis is placed on information that can be deduced from the measurements in each case In the second part of the paper, we report the data measured on composite samples containing a CMR phase (La-Ca-Mn-O) and an insulating phase (Mn3O4) The results are discussed in the framework of percolation theory We show how the grain boundaries affect the electrical properties of these materials, and we highlight the crucial role of geometric (demagnetization) effects on the resistance vs magnetic field measurements [less ▲]

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See detailIntérêt du suivi sportif à la piste des chevaux d’endurance dans la détection des problèmes subcliniques
Fraipont, Audrey ULg; Van Erck, Emmanuelle; Art, Tatiana ULg et al

in 35ème Journée de la Recherche équine (2009)

The aim of this study was to evaluate a field exercise test specifically designed for endurance horses and to determine the relevant parameters allowing discrimination between healthy horses (H) and ... [more ▼]

The aim of this study was to evaluate a field exercise test specifically designed for endurance horses and to determine the relevant parameters allowing discrimination between healthy horses (H) and horses presenting subclinical disorders (SP). Twenty four endurance horses underwent blood analyses, general examination and special exams to define a posteriori 2 groups: group H composed of healthy horses (n=12) and group SP included horses presenting subclinical disorders (n=12). The exercise test consisted of a warm-up followed by 3 gallop steps (27 km, 1.5km, 1.5km) at incremental speed. Lactates were measured after each step, an ECG was recorded during effort and recovery, speed was monitored by a GPS. Significant differences were observed between H and SP groups for VLA4, V160 and heart rate during recovery with better values for H horses. These results demonstrate the pertinence of a medical athletic follow-up in endurance horses: this field exercise test is easily achievable and allows the detection of subclinical disorders which would otherwise remain unsuspected by the riders. [less ▲]

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See detailCarbon cycling in the mixolimnion of Lake Kivu (East Africa)
Borges, Alberto ULg; Descy, J.-P.; Delille, Bruno ULg et al

Conference (2009)

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See detailNRPS molecules producing strains isolated from Bikalga and Soumbala fermented condiments of Burkina Faso.
Savadogo, A.; Chollet-Imbert, M.; Tapi, A. et al

Conference (2009)

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See detailContinuous formulation for bottom friction in free surface flows modelling
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in River Basin Management V (2009)

Bottom friction modelling is an important step in river flows computation with 1D or 2D solvers. It is usually performed using empirical laws established for uniform flow conditions or a modern approach ... [more ▼]

Bottom friction modelling is an important step in river flows computation with 1D or 2D solvers. It is usually performed using empirical laws established for uniform flow conditions or a modern approach based on turbulence analysis. Following the definition of the flow validity field of the main friction laws proposed in the literature, an original continuous formulation has been developed. It is suited to model river flows with a wide range of properties (water depth, discharge, roughness…). The efficiency of this new formulation, theoretically established and numerically adjusted, is demonstrated through various practical applications. [less ▲]

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See detailLes services à perte : modalités d'un honoraire digne ?
Wildemeersch, Jonathan ULg

in Regards croisées sur l'avenir des professions libérales (2009)

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See detailStudy of Essential Oils of Some Plants from Algeria (Salvia officinalis, Thymus vulgaris and Ruta chalepensis)
Brada, M.; Achour, D.; Wathelet, Jean-Paul ULg et al

Poster (2009)

The essential oil of three plants (Salvia officinalis, Thymus vulgaris and Ruta chalepensis) collected from Chlef, in the north west of Algeria, was isolated by steam distillation and investigated by GC ... [more ▼]

The essential oil of three plants (Salvia officinalis, Thymus vulgaris and Ruta chalepensis) collected from Chlef, in the north west of Algeria, was isolated by steam distillation and investigated by GC and GC/MS. The yield of essential oil (g/100g) was 1.6% for Salvia officinalis, 2.6% for Thymus vulgaris and 1.1% for Ruta chalepensis. The Salvia officinalis was mainly composed of b-thujone (25%), camphor (23.6%), 1,8-cineole (21.5%), viridiflorol (9.5%) and a-thujone (6%). The main constituents of Thymus vulgaris were carvacrol (48.4%), g -terpinene (14.9%), p-cymene (14.7%) and thymol (5.6%) while 2-undecanone (83.2%) constituted the major component of Ruta chalepensis essential oil. [less ▲]

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See detailA One-Field Discontinuous Galerkin Formulation of Non-Linear Kirchhoff-Love Shells
Noels, Ludovic ULg

Conference (2009)

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing ... [more ▼]

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing for problems involving high-order derivatives, since discontinuous Galerkin (DG) methods can also be seen as a means of enforcing higher-order continuity requirements. Recently, DG formulations of linear and non-linear Kirchhoff-Love shell theories have been proposed. This new one-field formulations take advantage of the weak enforcement in such a way that the displacements are the only discrete unknowns, while the C1 continuity is enforced weakly. The resulting one field formulation is a simple and efficient method to model thin structures and can be applied to various computational methods. [less ▲]

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See detailWater and related chemistry in the Solar System. A Guaranteed Time Key Programme for Herschel
Hartogh, P.; Crovisier, J.; Lellouch, E. et al

in EPSC Abstracts 2009 (2009)

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See detailCe que causer veut dire
Durand, Pascal ULg

in Durand, Pascal (Ed.) Entre presse et littérature. Le Mousquetaire, journal de M. Alexandre Dumas (1853-1857) (2009)

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See detailPlant defense reactions stimulated following perception of Bacillus lipopeptides
Ongena, Marc ULg; Henry, G.; Jourdan, E. et al

Conference (2009)

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See detailThe inside-out transobturator sling for the surgical treatment of post-radical prostatectomy urinary incontinence: Interim results of a prospective, observational study after a 1-year minimum follow-up
Waltregny, David ULg; Leruth, Julie ULg; de Leval, Jean ULg

in Neurourology and Urodynamics (2009), 28(7), 687-688

Hypothesis / aims of study The aim of this study was to prospectively evaluate the short-term safety and efficacy of the inside-out transobturator sling procedure for treating post-radical prostatectomy ... [more ▼]

Hypothesis / aims of study The aim of this study was to prospectively evaluate the short-term safety and efficacy of the inside-out transobturator sling procedure for treating post-radical prostatectomy (RP) stress urinary incontinence (SUI). Study design, materials and methods The sling technique uses specific instruments and a polypropylene mesh with 2 arms that are passed inside to outside through the obturator foramens, pulled for compressing the bulbar urethra upward, and tied to each other across the midline. Intra-operative urodynamic evaluation is performed to record the urethral pressure profile (UPP) and to measure the abdominal leak point pressure (ALPP) and maximal urethral pressure (MUP) before and after sling tensioning. Urodynamic measurements are repeated until tension on both arms of the mesh increases ALPP to approximately 100 cm H2O. In case of associated urethral stenosis, classic endoscopic urethrotomy is performed first. Inclusion criteria were clinically and urodynamically demonstrated SUI, positive bulbar compression test, and signed informed consent. Patients with detrusor overactivity or active urinary infection were excluded. Baseline evaluation included detailed history, physical examination with a bulbar urethra compression test, urine analysis, multichannel urodynamics, administration of self-questionnaires assessing urinary continence (questions 1 through 3 of the urinary section of the UCLA-PCI-SF questionnaire (1)) and quality of life (QoL) (Ditrovie questionnaire (2)), flexible urethrocystoscopy, and urethrocystography. The degree of incontinence was arbitrarily categorized as mild (1–2 pads/day), moderate (3–5 pads/day) or severe (>5 pads/day), as previously described (3). Follow-up evaluation at 1, 6, 12 months, and yearly thereafter included physical examination, uroflowmetry with PVR measurement, and administration of the self-questionnaires assessing urinary continence and QoL. All patients were also asked to self-evaluate their satisfaction with the treatment. Cure was defined by no pad use and improvement by a number of pads/day ≤ 2 and reduced by at least 50%. Peri- and post-operative complications were recorded. Results From April 2006 through March 2009, 95 consecutive patients who fulfilled inclusion and exclusion criteria underwent the sling procedure using the same operative protocol. As of March 2009, 58 patients who consecutively underwent the sling procedure were expected to have a minimum follow-up of 1 year. Mean age of the patients was 67.6 ± 6.5 years (range 52-79). Mean body mass index was 27.0 ± 3.6 (range 21.3 – 39.0). Of the 58 patients, 9 (16%) patients had undergone prior surgery for SUI: bulking agent injection in 5 patients, prior sling implantation in 1 patient and artificial urinary sphincter (AUS) implantation in 4 patients. A previous urethrotomy or urethral dilatation for urethral stenosis had been performed in 8 (14%) patients and 8 (14%) patients had had pelvic irradiation. Preoperatively, 14 (24%), 26 (45%), and 18 (31%) patients were using 2 (mild SUI), 3 to 5 (moderate SUI), and >5 pads/day (severe SUI), respectively. The sling procedure was performed under general and spinal anesthesia in 22 (38%) and 36 (62%) patients, respectively, and was preceded by an endoscopic urethrotomy in 5 (9%) patients. Penile prostheses were implanted concomitantly to the sling in 2 patients. Before sling tensioning, mean MUP and ALPP were 40 ± 21 cm H2O (range 5-101) and 45 ± 22 cm H2O (range 10-100). After sling tensioning, mean MUP and ALPP were 89 ± 24 cm H2O (range 44-141) and 109 ± 26 cm H2O (range 60-165). Mean increase in MUP and ALPP between post- and pre-tensioning of the sling was 49 ± 29 cm H2O (range 1-125) and 64 ± 32 cm H2O (range 20-135), respectively. Mean operative time was 65 ± 18 minutes. No intra-operative complication was noted. Seven (12%) patients required suprapubic catheterization; normal voiding resumed in all 7 patients except 1 who underwent urinary diversion for complete radiation-induced anastomotic stenosis. Mild perineal hematoma not requiring therapy was observed in 6 patients. Six-month and 1-year minimum follow-up was available on 54 (93%) and 56 (96%) of the 58 patients, respectively (Table 1). Two patients were completely lost to follow-up after the 1-month visit. At this 1-month visit, one patient was cured while the other was improved. Table 1. Postoperative pad usage Follow-up 6-month visit 1-year visit Preoperative SUI severity / Outcome Mild to moderate SUI (≤5 pads/d) Severe SUI (> 5 pads/d) Entire cohort (≥ 2 pads/d) Mild to moderate SUI (≤ 5 pads/d) Severe SUI (> 5 pads/d) Entire cohort (≥ 2 pads/d) Cure 22 (55.0%) 9 (50.0%) 31 (53.5%) 23 (57.5%) 8 (44.5%) 31 (53.5%) Improvement 13 (32.5%) 5 (27.8%) 18 (31.0%) 14 (35.0%) 6 (33.3%) 20 (34.4%) Failure 1 (2.5%) 4 (22.2%) 5 (8.6%) 1 (2.5%) 4 (22.2%) 5 (8.6%) Data not available 4 (10.0%) 0 (0.0%) 4 (6.9%) 2 (5.0%) 0 (0.0%) 2 (3.5%) Of note, at 12 months, among the 18 patients with preoperative severe incontinence, 8 (44.5%) were cured and 6 (35%) others were improved. In addition, SUI cure/improvement rates appeared to be similar at the 6 and 12 months time points. The 3 failures included one patient who had undergone post-RP radiation therapy. This man later developed a complete urethral anastomotic closure and underwent cystectomy with transileal ureterostomy 9 months after the sling procedure. The two other failed patients had a vesico-urethral anastomotic stricture before sling implantation. Both patients were implanted with an AUS after the sling procedure. After cutting the mesh arms laterally to the bulb, the AUS cuff was placed without difficulty around the bulbar urethra. The 4th failed patient had undergone previous radiation therapy and had a bulbar urethral stenosis. He is now wearing penile collectors. The 5th patient had a vesico-urethral stenosis that underwent urethrotomy just before the sling implantation. The patient has been offered the placement of an artificial urinary sphincter. Preoperative and postoperative max flow rate and postvoid residual values were not different (Table 2). Overall, QoL was substantially enhanced and 85% patients were satisfied with the procedure. Table 2. Postoperative evolution of QoL scores and voiding parameters QoL and voiding parameters Baseline (mean ± SD [range]) 6-month visit (mean ± SD [range]) 1-year visit (mean ± SD [range]) Ditrovie QoL scores (scale from 10 [best] to 50 [worst]) 32 ± 7 (17-50) 16 ± 8 (10-40) 17 ± 8 (10-42) Max flow rate (mL/sec) 20 ± 9 (6-46) 18 ± 9 (6-44) 17 ± 10 (4-51) Post void residual (mL) 17 ± 32 (0-160) 21 ± 51 (0-243) 6 ± 21 (0-87) No sling infection, urethra erosion, persistent pain or neurological complication was observed. No sling was withdrawn or cut. Interpretation of results The inside-out transobturator sling was associated with a minimal risk of intra- and post-operative complications. Postoperative SUI cure/improvement rates were found to remain stable over a 1-year period. The sling procedure appeared to be efficient at short term even in the group of patients with severe SUI before surgery. The sling procedure does not compromise concomitant penile prostheses or subsequent AUS implantation. Longer follow-up times are required to determine the long-term efficacy of this sling procedure. Concluding message The one-year results of this prospective study suggest that the inside-out transobturator sling is a safe and efficient surgical procedure at short term for the treatment of post-RP SUI. [less ▲]

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See detailInteraction of nanoparticles for drug delivery with biomimetic model membranes
Frost, Rickard; Cerda, Bernadino; Grandfils, Christian ULg et al

Poster (2009)

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See detailLearning Visual Representations for Interactive Systems
Piater, Justus ULg; Jodogne, Sébastien ULg; Detry, Renaud ULg et al

in 14th International Symposium on Robotics Research (2009)

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See detailHydro-mechanical modeling of damage due to underground excavation in hardened clay
Levasseur, Séverine ULg; Collin, Frédéric ULg; Frieg, Bernd et al

in Pietruszczak, Stan; Pande, Gyan; Tamagnini, Claudio (Eds.) et al Computational Geomechanics (2009)

A zone with significant irreversible processes and significant changes in flow and transport properties is expected to be formed after underground excavations. The perturbation of the excavation could ... [more ▼]

A zone with significant irreversible processes and significant changes in flow and transport properties is expected to be formed after underground excavations. The perturbation of the excavation could lead to a significant increase of the permeability, related to diffuse and/or localized crack proliferation in the material. The main objective of the study is to model these processes at large scale in order to assess their impacts on the performance of radioactive waste geological repositories. This paper concerns more particularly the hydro-mechanical modeling of a long term dilatometer experiment performed in Mont Terri Rock Laboratory in Switzerland. The proposed model defines the permeability as a function of the aperture of the cracks that are generated during the excavation. With this model, the permeability tensor becomes anisotropic. These developments are validated with the results of the experiment. [less ▲]

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See detailImpact de l’action anthropique sur la diversité floristique et structurale de la forêt de Rumonge au Burundi
Hakizimana, P; Lejoly, J; Habonimana, B et al

Poster (2009)

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See detailOperational Determination of Multiqubit Entanglement Classes
Bastin, Thierry ULg

Conference (2009)

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See detailMain characteristics of hypertensive patients seen in academic hospitals from Belgium: Preliminary analysis
Persu, A.; Ngueta, G.; Krzesinski, Jean-Marie ULg et al

in Acta Clinica Belgica (2009), 64-2(6), 165

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See detailBenefits of thixoforging hot-crack-sensitive aluminium alloys at high solid fraction
Vaneetveld, Grégory ULg; Rassili, Ahmed ULg; Pierret, Jean-Christophe ULg et al

in Proceedings of The 13th Esaform Conference on Material Forming (2010) - semi-solid processing (2009)

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<fs<1), which involves the processing of alloys in the semi-solid state. The use of semi-solid material with globular ... [more ▼]

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<fs<1), which involves the processing of alloys in the semi-solid state. The use of semi-solid material with globular microstructure helps to decrease forming load. But the introduction of a liquid phase in the material is a source of defects that limit mechanical properties of thixoforged parts. One of these defects is the hot cracking for some hot crack-sensitive wrought aluminium alloys. Hot cracking occurs because of strain and deformation during last step of solidification. This paper shows how thixoforging process helps to lower hot cracking tendency without modification of the alloy composition by decreasing strain and deformation due to shrinkage. Different experimental tests by extrusion of 7075 aluminium alloys are used. [less ▲]

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See detailOn modal interactions in strongly nonlinear systems
Peeters, Maxime ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in Euromech 503, Nonlinear Normal Modes, Dimension Reduction and Localization in Vibrating Systems, Frascati, 2009 (2009)

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See detailApplications of 3D visualization in science and engineering
Burrus, Nicolas; Hoyoux, Thomas; Verly, Jacques ULg

Conference (2009)

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See detailEffects of crops on solute transport in undisturbed soil
Garré, Sarah ULg; Javaux, Mathieu; Vanderborght, Jan

Poster (2009)

Models predicting movement of surface applied chemicals incorporate knowledge on the water velocity field and moisture content distribution. Although the influence of root water uptake on solute transport ... [more ▼]

Models predicting movement of surface applied chemicals incorporate knowledge on the water velocity field and moisture content distribution. Although the influence of root water uptake on solute transport is commonly recognized as important, it has been studied sparsely. Yet, plants may take up a large part of the infiltrating water, thereby influencing the water flow pattern in the soil and concurrently solute transport processes. For this reason, experiments are required to investigate the relationship between plant root water uptake and flow field variability. The role of root water uptake on solute transport will be elucidated in two undisturbed soil columns. During three consecutive experiments, the influence of growing barley on tracer movement through a silty soil in two lysimeters will be followed. At the first stage, an inert tracer is put on the two bare lysimeters and leached with constant irrigation. As steady-state flow can be assumed, it is possible to follow the tracer movement in the column by ERT and to identify regions of preferential flow and solute transport parameters. During the second experiment, the tracer will be applied to mature barley grown in the lysimeters. Combining the information about the water content obtained with TDR with the relation between water content, soil solution salinity and bulk electrical conductivity, the soil solution salinity distribution can be derived from images of bulk electrical conductivity obtained with ERT. Root growth will be monitored using a minirhizotron. By comparing the transport parameters obtained after these two experiments, the effect of root water on the transport process can be quantified. When the columns are washed out and the barley is harvested, the third phase will be carried out under the same steady state flow conditions as in the first experiment to investigate the effect of dead roots on soil structure. [less ▲]

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See detailDesign of a Stable Lagrange Multiplier Space for Stiff Boundary Conditions
Béchet, Eric ULg; Moës, Nicolas; Wohlmuth, Barbara

in Zilian, A.; Fries, T. P. (Eds.) International Conference on Extended Finite Element Methods – Recent Developments and Applications XFEM 2009 (2009)

We introduce a new algorithm to define a stable Lagrange multiplier space to impose stiff interface conditions within the context of the eXtended Finite Element Method. In contrast to earlier approaches ... [more ▼]

We introduce a new algorithm to define a stable Lagrange multiplier space to impose stiff interface conditions within the context of the eXtended Finite Element Method. In contrast to earlier approaches, we do not work with an interior penalty formulation as, e.g., for Nitsche techniques, but impose the constraints weakly in terms of Lagrange multipliers. The new algorithm allows a local construction of the Lagrange multiplier space while improving the accuracy of the computed fields. The originality of this approach with regard to former approaches lies in the use of the trace of primary shape functions defined on the domain, and a simplified procedure to define the mesh on the interface. Moreover, the newly constructed Lagrange multiplier space satisfies, in contrast to the naive approach, a uniform inf-sup condition. [less ▲]

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See detailOverflowing processes for the production of surfactant in bioreactors.
Guez, J.S.; Chenicker, S.; Jacques, Philippe ULg et al

Poster (2009)

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See detailFlushing operations with limited sediment availability
Dewals, Benjamin ULg; Brasseur, Nicolas; Erpicum, Sébastien ULg et al

in Proc. 33rd IAHR Congress: Water Engineering for a Sustainable Environment (2009)

Detailed reference viewed: 13 (2 ULg)
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See detailLe cortisol salivaire comme indicateur du bien-être chez la truie gestante lors de regroupement.
Wavreille, José; Planchon, V.; Remience, Virginie et al

in 41èmes Journées de la Recherche porcine (2009)

Detailed reference viewed: 40 (7 ULg)
See detailProblèmes et conflits en Afrique centrale
Kabamba, Bob ULg

Conference (2009)

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See detailYlang-ylang (Cananga odorata (Lam.) Hook. & Thoms. var. genuina) essential oils from Comoros Islands: characterization and variability
Benini, Céline ULg; Wathelet, Jean-Paul ULg; du Jardin, Patrick ULg et al

Poster (2009)

The Union of the Comoros is the world’s biggest producer of ylang-ylang essential oils. Comorian ylang-ylang also provides the most valuable essential oil that can be found on international market. This ... [more ▼]

The Union of the Comoros is the world’s biggest producer of ylang-ylang essential oils. Comorian ylang-ylang also provides the most valuable essential oil that can be found on international market. This product represents a high percentage of Comoros’ annual currency. Ylang-ylang essential oil is obtained by fractionned hydrodistillation or steam distillation of Cananga odorata fresh flowers. This oil is commercialized in five different quality grades (extra S; extra; I; II; III) which possess their own physicochemical properties. [less ▲]

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See detailBody dermatitis in a donkey caused by the Psoroptes ovis
Mignon, Bernard ULg; Lekimme, Mireille ULg; Huynen, K. et al

Conference (2009)

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See detailHigh-throughput methodology applied to screening of carbohydrate-based surfactant interfacial properties for colloidal system formulations
Razafindralambo, Hary ULg; Blecker, Christophe ULg; Deroanne et al

Poster (2009)

Carbohydrate-based surfactants (CBS) constitute an attractive class of amphiphilic molecules owing to their structural diversity generating a wide range of properties which could be developed in food and ... [more ▼]

Carbohydrate-based surfactants (CBS) constitute an attractive class of amphiphilic molecules owing to their structural diversity generating a wide range of properties which could be developed in food and non-food applications. Based on many functional groups of the carbohydrate part, it is possible to design multiple amphiphilic structures of CBS varying in the hydrophilic head groups (mono-, oligo-, or polysaccharides), hydrophobic tail (mono-, di-, tricatenar) but also in the linker/spacer between them. The main structures of CBS include mono- and bicatenar glycolipids, bolaforms, and gemini. Moreover, CBS compounds can be produced from the most abundant renewable materials allowing large product concept possibilities. Among general properties of surfactants, interfacial properties molecules occupy a fundamental key role for colloidal system formulations since they control most of technological aptitudes required for forming and stabilizing food, cosmetic, agrochemical, detergent, and pharmaceutical products. High-throughput methodology applied to screening of CBS interfacial properties appears crucial for achieving optimum formulations of colloidal systems like foams and emulsions for which small amounts of single or mix surface-active agents are often needed and numerous physical and chemical parameters are involved. This general approach may be applied to any amphiphilic molecules produced from other renewable resources of surface-active compounds like micro-organisms and by direct extraction from vegetable materials. One of the key factors for the development of this methodology is the use of automated instrument systems in laboratory scale which are still lacking in this field compared to those existing in the analytical chemistry and biochemistry areas. [less ▲]

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See detailSurveying activity-travel behavior in Flanders: Assessing the impact of the survey design
Cools, Mario ULg; Moons, Elke; Bellemans, Tom et al

in Macharis, C.; Turcksin, L. (Eds.) Proceedings of the BIVEC-GIBET Transport Research Day 2009, Part II (2009)

Ever since car ownership and car use started to increase in Western Europe and the USA, transportation planners attempted to model people’s travel behavior. In the context of the Feathers project a ... [more ▼]

Ever since car ownership and car use started to increase in Western Europe and the USA, transportation planners attempted to model people’s travel behavior. In the context of the Feathers project a dynamic activity-based travel demand framework is developed for Flanders. In this paper, the complete survey design of the data collection effort required for such dynamic activity-based model is discussed. A mixed survey design of using a PDA application on the one hand, and using traditional paper and pencil diaries on the other hand, turns out to be a very suitable way of collecting detailed information about planned and executed activity-travel behavior of households. The results show that no attrition effects are present, not on the number of out-of-home activities reported, nor on the number of trips reported. Moreover the survey mode (PDA versus paper and pencil) has no direct impact on the quantities investigated. Notwithstanding, it is essential for further analysis on the Feathers data to explicitly take into account mode effects because of two reasons. First, the effect of explanatory variables can be influenced by the survey mode. Second, the variance in the estimation of the quantity investigated can differ significantly. Heteroscedatisc linear regression models provide the required framework to explicitly take into account these mode effects. [less ▲]

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See detailLe dopage en cyclisme sur route : un objet d’étude criminologique
Fincoeur, Bertrand ULg

in Guedah, Mohammed (Ed.) Délinquances et changements sociaux des modes de vie et des pratiques d'intervention (2009)

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See detailShifting Towards Environment-Friendly Modes: Profiling Travelers using Q-Methodology
Cools, Mario ULg; Moons, Elke; Janssens, Brecht et al

in Proceedings of the 88th Annual Meeting of the Transportation Research Board (DVD-ROM) (2009)

Due to a variety of reasons, the previous century is characterized by an extraordinary growth in car use that has continued into the current century. This has resulted in serious environmental ... [more ▼]

Due to a variety of reasons, the previous century is characterized by an extraordinary growth in car use that has continued into the current century. This has resulted in serious environmental repercussions. Despite technological advancements, the externalities remain an ecological threat that can not be discarded by policy makers. Therefore, it is essential that policy makers focus on reducing car use and on stimulating the shift towards more environment-friendly transport modes. In this study, Q-methodology is adopted as the technique to segment people, and to ascertain which approaches and determinants matter to medium distance travel. Segmentation is important, as policy measures will be more efficient and effective if they are fine-tuned on specific target groups. The analysis revealed that four discourses preponderate the paradigm of environmentally sustainable transport: travelers who use public transport as a dominant alternative, car-dependent travelers, travelers with a positive perception of using public transport, and travelers with a preference for car use. Concerning rational, economic motives, individuals evaluate travel time reliability as most important. To increase the reliability policy makers should consider the use of separate bus lanes and traffic light manipulation. In addition, public transport can be made even more attractive, when costs of cars are made more variable by road or congestion charging. When the subjective motives are discussed, the differences between the different groups of travelers were more pronounced. Next to increasing the benefits of using public transport, policy makers should also pay attention to removing psycho-social barriers. [less ▲]

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See detailGerminal centre innervation of bovine and human tonsils related to prion diseases.
Defaweux, Valérie ULg; Dorban, Gauthier; Antoine, Nadine ULg et al

in Brain, Behavior & Immunity (2009), 23(1), 10

Detailed reference viewed: 24 (7 ULg)
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See detailA comparison between pulse contour analysis and Doppler echocardiographic measurements of cardiac output in awake horses
Guidi, E; Amory, Hélène ULg; Borde, Laura ULg et al

in In Proceedings of the 3rd Annual Congress of the European College of Equine Internal Medicine (ECEIM) (2009)

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See detailFastes princiers et culte eucharistique au pays de Liège : cérémonies baroques au cœur d’une principauté ecclésiastique des XVIIe et XVIIIe siècles
Henneau, Marie-Elisabeth ULg

in Dompnier, Bernard (Ed.) Les cérémonies extraordinaires du Catholicisme baroque (2009)

Detailed reference viewed: 28 (7 ULg)
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See detailRythmes biologiques et comportement animal.
Poncin, Pascal ULg

Conference (2009)

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See detailA web interface for griding arbitrarily distributed in situ data based on Data-Interpolating Variational Analysis (Diva)
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Troupin, Charles ULg et al

Conference (2009)

Spatial interpolation of observations on a regular grid is a common task in many ceanographic disciplines (and geosciences in general). It is often used to create climatological maps for physical ... [more ▼]

Spatial interpolation of observations on a regular grid is a common task in many ceanographic disciplines (and geosciences in general). It is often used to create climatological maps for physical, biological or chemical parameters representing e.g. monthly or seasonally averaged fields. Since instantaneous observations can not be directly related to a field representing an average, simple spatial interpolation of observations is in general not acceptable. Diva (Data-Interpolating Variational Analysis) is an analysis tool which takes the error in the observations and the typical spatial scale of the underlying field into account. Barriers due to the coastline and the topography in general and also currents estimates (if available) are used to propagate the information of a given observation spatially. Diva is a command-line driven application written in Fortran and Shell Scripts. The observations and parameters are specified by the user using text files. The analyzed field and the expected error variance are returned as NetCDF files. This form of interaction with Diva is very similar to other high-performance codes and is a familiar approach for ocean modelers. However it represents a steep learning curve for oceanographers from other disciplines not familiar with command-line applications and programming. To make Diva easier to use, a web interface has been developed (http://gher-diva.phys.ulg.ac.be). Installation and compilation of Diva is therefore not required. The user can directly upload his/her data in ASCII format and enter several parameters for the analysis. The analyzed field, location of the observations, and the error mask are presented as different layers using the Web Map Service protocol. They are visualized in the browser using the Javascript library OpenLayers allowing the user to interact with layers (for example zooming and panning). Finally, the results can be downloaded as a NetCDF file, Matlab file (also readable in Octave, an open source program similar to Matlab) and Keyhole Markup Language (KML) file for visualisation in applications such as Google Earth. [less ▲]

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See detailInfluence of medium composition on oxygen transfer rate in animal cell culture
Toye, Dominique ULg; Galifi, Alain; Salmon, Thierry ULg et al

in Proceedings of 8th World Congress on Chemical Engineering (2009)

Experiments were conducted in a 0.25 m diameter bubble column to investigate the effect of animal cell culture medium composition on oxygen transfer rate. Air is used as the dispersed phase. The gas ... [more ▼]

Experiments were conducted in a 0.25 m diameter bubble column to investigate the effect of animal cell culture medium composition on oxygen transfer rate. Air is used as the dispersed phase. The gas superficial velocity is varied between 0.4 and 2 cm/s (aeration rate ranging between 0.05 and 0.25 vvm) and the bubble column is thus operated in the homogenous regime. Aqueous solutions the composition (electrolyte, protein concentrations) of which mimics a mammalian cell culture medium) are used as the continuous phase. In particular, the effect on oxygen transfer rate of additive such as PVP, Pluronic F-68 which are usually used to protect cells against local hydrodynamic stresses induced by bubble coalescence and bursting is addressed. For each composition, the mass transfer coefficient is measured by the "gas in – gas out" method using a fast response dissolved oxygen probe. Its increase with gas velocity is measured. The liquid viscosity and surface tension are experimentally determined as a function of culture medium composition. Bubble size distribution is measured at different scales using three experimental techniques: gas disengagement technique, two dual optical probes and photography, which lead to results in good qualitative agreement one with each other. The integrated analysis of these data allows to decouple the effects of the different additive on coefficient kL and on the interfacial area, a. [less ▲]

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See detailDynamic interaction between merchandizes and supporting structure in steel storage racking systems
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of the COMPDYN 2009 Conference (2009)

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See detailLes tribulations du Grand Bâtard Antoine de Bourgogne en Italie (1475)
Marchandisse, Alain ULg; Masson, Christophe ULg

in Publication du Centre Européen d'Etudes Bourguignonnes (2009), XLIX

During his Italian journey, which aimed at confirming to Ferrante of Aragon, king of Naples, his elevation to the title of knight of the Golden Fleece, the Bastard Antoine multiplied the visits, the ... [more ▼]

During his Italian journey, which aimed at confirming to Ferrante of Aragon, king of Naples, his elevation to the title of knight of the Golden Fleece, the Bastard Antoine multiplied the visits, the contacts, in Savoy, in Milan twice, in Naples, in the papal court, in Florence, in Venice and in Ferrare. He revealed himself a very pleasant person everywhere he stayed and, in return, was welcomed with the greatest consideration. Whatever may have been, in the name of his brother, the diplomatic relations struck up by the Bastard with the Italian sovereigns, and whatever design they had, either creating an irrepressible strike force against France, or stirring up the most stunning of coalitions against its king by the conclusion of a most politically profitable marital union or by the gift of the Golden Fleece, even if Antoine was able to recruit a few soldiers and weapons, since they took place while the siege of Neuss was dragging on miserably, all these attempts remained in vain in fine. In 1482, the Estates of Burgundy fell to a child and Marie de Bourgogne left behind her a political situation as delicate as the one who prevailed before Sixte IV offered Antoine, by legitimizing him, the dynastic capacity to reign. [less ▲]

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See detailUniversal applicability of Total Error for the validation of bioanalytical methods
Rozet, Eric ULg; Boulanger, Bruno ULg; Rudaz, S. et al

Conference (2009)

An innovative universal strategy using Total Error is thus proposed to decide about the method’s validity that controls the risk of accepting an unsuitable assay together with the ability to predict the ... [more ▼]

An innovative universal strategy using Total Error is thus proposed to decide about the method’s validity that controls the risk of accepting an unsuitable assay together with the ability to predict the reliability of future results. Several examples of applications of this validation methodology to various types of assays [LC-MS, ELISA, Bio-Assays] will be presented. [less ▲]

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See detailQuand les traditions culturelles cimentent une volonté d'exister : le cas des Wallons du Wisconsin
Lempereur, Françoise ULg

in Port Acadie : Revue Interdisciplinaire en Etudes Acadiennes = Port Acadie: An Interdisciplinary Review in Acadian Studies (2009), 13-14-15

In the middle of the XIXe century, thousands of Walloons left Belgium to settle in Wisconsin, USA. The article summarizes the cultural traditions of this little "marginal" group and considers the ... [more ▼]

In the middle of the XIXe century, thousands of Walloons left Belgium to settle in Wisconsin, USA. The article summarizes the cultural traditions of this little "marginal" group and considers the relevance of safeguarding cultural heritage as a positive ethnical fundament. [less ▲]

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See detailNumerical Evaluation of Load induced Thermal Strain in restraint Structures compared with an Experimental Study on reinforced Concrete Columns
Schneider, Ulrich; Schneider, Martin; Franssen, Jean-Marc ULg

in Conference Proceedings Fire and Materials 2009 (2009)

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See detailLe Dévonien: des mousses à l'arbre.
Gerrienne, Philippe ULg

Conference (2009)

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See detailDevelopment of an original approach to evaluate effects of surfactants, biomass and pollutants on the scaling-up of a two-phase partitioning bioreactor
Aldric, Jean-Marc ULg

(2009)

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to ... [more ▼]

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to design and scale-up TPPBs. The partitioning of the two phases remains a misunderstood way of research. In particular, the impact of pollutant (isopropylbenzene), biomass and surfactant extract needs to be better evaluated. RESULTS:. An adaptated scale-down apparatus has been developed in order to quantify the speed of phase partitioning (SPP) into a plug flow section. Firstly, it was shown that isopropylbenzene (IPB) doesn’t destabilize more significantly the system. Secondly, respectively 0.5 g.L-1 and 0.05 g.L-1 of biomass and surfactant extract, separately or in mixture, were sufficient to ensure the stability of the two-phase system. Finally, a 100 m3 limit of scaling-up was suggested on the basis of the circulation time comparison. CONCLUSION: The scaling-up of an aqueous/silicone-oil TPPB was found to be definitely conceivable when the presence of biotic compounds were considered. However, further considerations are needed to verify our assumptions, in particular by taking into account the velocity field pattern in full-scale bioreactors and reproduce it in lab-scale apparatus. [less ▲]

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See detailViscoelastic Modeling of Brain Tissue: A Fractional Calculus-Based Approach
Libertiaux, Vincent ULg; Pascon, Frédéric ULg

in Ganghoffer, Jean-François; Pastrone, Franco (Eds.) Mechanics of Microstructured Solids Cellular Materials, Fibre Reinforced Solids and Soft Tissues (2009)

In recent years, the mechanical study of the brain has become a major topic in the field of biomechanics. A global biomechanical model of the brain could find applications in neurosurgery and haptic ... [more ▼]

In recent years, the mechanical study of the brain has become a major topic in the field of biomechanics. A global biomechanical model of the brain could find applications in neurosurgery and haptic device design. It would also be useful for car makers, who could then evaluate the possible trauma due to impact. Such a model requires the design of suitable constitutive laws for the different tissues that compose the brain (i.e. for white and for gray matters, among others). Numerous constitutive equations have already been proposed, based on linear elasticity, hyperelasticity, viscoelasticity and poroelasticity. Regarding the strong strain-rate dependence of the brain’s mechanical behaviour, we decided to describe the brain as a viscoelastic medium. The design of the constitutive law was based on the Caputo fractional derivation operator. By definition, it is a suitable tool for modeling hereditary materials. Indeed, unlike integer order derivatives, fractional (or real order) operators are non-local, which means they take the whole history of the function into account when computing the derivative at current time t. The model was calibrated using experimental data on simple compression tests performed by Miller and Chinzei. A simulated annealing algorithm was used to ensure that the global optimum was found. The fractional calculus-based model shows a significant improvement compared to existing models. This model fits the experimental curves almost perfectly for natural strains up to − 0.3 and for strain-rates from 0.64s − 1 to 0.64 10− 2 s − 1. [less ▲]

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See detailDetection and Correction of Outliers for Fatty Acids Contents Measured by Mid-Infrared Spectrometry Using Random Regression Test-Day Models
Soyeurt, Hélène ULg; Dardenne, Pierre; Gengler, Nicolas ULg

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

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See detailPhysicochemical characterization of fat blends related to margarine formulation
Danthine, Sabine ULg; Fernando Munoz, J; Cavillot, V et al

Poster (2009)

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See detailUsing Artificial Vision for the Microscopic Identification of Ores with Reflected Light: Preliminary Results.
Castroviejo, Ricardo; Brea, Carolina; Perez-Barnuevo, Laura et al

in Proceedings 10th Biennial SGA Meeting (2009)

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See detailModulation of cytochrome P450 1A1 expression and activity in intestinal Caco-2 cells by components of Ginkgo biloba-based dietary supplements
Ribonnet, Laurence; Callebaut, Alfons; Scippo, Marie-Louise ULg et al

in Toxicology Letters (2009), 189

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See detailEnergising an exchange network between trainers in health promotion in the long term
Giot, Catherine ULg; Gosselain, Yves; Vanesse, Catherine et al

in Archives of Public Health (2009), 67(Supplement 2), 27-28

Detailed reference viewed: 31 (19 ULg)
See detailMassive stars and emission-line stars with GAIA
Blomme, Ronny; Frémat, Y.; Lobel, Alex et al

Poster (2009)

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See detailIRF3 is required for the induction of allergic airway inflammation by lung dendritic cells in a mouse model of house dust mite-induced atopic asthma
Marichal, Thomas ULg; Bedoret, Denis; Goriely, M. et al

in Abstracts of the 17th Annual European Respiratory Society Congress, Vienna, Austria (2009)

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See detailFamiliar person recognition: do we remember more episodic memories from faces than from names?
Barsics, Catherine ULg; Brédart, Serge ULg

Poster (2009)

This study was aimed at investigating whether the recognition of familiar faces is more likely to be associated with an experience of Remembering than the recognition of familiar names. Using the Remember ... [more ▼]

This study was aimed at investigating whether the recognition of familiar faces is more likely to be associated with an experience of Remembering than the recognition of familiar names. Using the Remember/Know paradigm the proportions of episodic memories recalled following the recognition of famous faces and names (Conditions) were assessed. Presented faces and names were previously judged by an independent group of participants as eliciting an equivalent level of familiarity. Nevertheless significant differences between the two conditions appeared in hit and false alarm rates. However, present results showed no significant difference in the recollection of personal memories (Remember responses conditionalized on the hits), following familiar faces compared with familiar names recognition. This finding contrasts with recent accounts assuming that faces are more prone to yield episodic memories than other cues to person identity. These results and their implications for current Interactive Activation and Competition person recognition models are discussed. [less ▲]

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See detailTransinusoidal portal vein embolisation with Onyx: feasibility study in pigs
Smits; Hav; Vanlengenhoeve et al

Poster (2009)

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See detailIn vitro evaluation of the fermentation characteristics in the pig intestines of hulless barleys differing in β-glucan content
Jha, Rajesh; Bindelle, Jérôme ULg; Rossnagel, Brian et al

in Journal of Animal Science (2009), 87(E-Suppl. 3), 103

Non-starch polysaccharides (NSP) in isolated form, especially β-glucans, are reported to have prebiotic effects in pigs. However, little information is available on the possible functional properties of ... [more ▼]

Non-starch polysaccharides (NSP) in isolated form, especially β-glucans, are reported to have prebiotic effects in pigs. However, little information is available on the possible functional properties of these NSP when the latter are still present in the fibrous matrix of whole cereals. Hulless barleys (HB) are good sources of β-glucans and the content is quite variable among varieties. In order to evaluate the potential of HB as functional feeds, an in vitro experiment was carried out to study the fermentation characteristics of 6 HB varieties varying in their β-glucan contents (36-99 g/kg DM) in comparison to 3 hulled barleys and 5 oats. After a pepsin-pancreatin hydrolysis, the ingredients were incubated in a buffer solution containing minerals and pig feces as inoculum. The accumulated gas production, proportional to the amount of fiber fermented, was measured for 48 h and modeled. Short-chain fatty acid (SCFA) and ammonia concentration were measured in the fermented solutions. A cereal type effect (P < 0.05) was observed on the fermentation kinetics parameters. Rates of degradation and total gas productions were higher in HB than in oats (P < 0.05) but no difference was observed between HB varieties. On the contrary, differences were found between HB for lag time and rate of degradation. The production of SCFA was also higher with HB (6.1 mMol/g DM incubated; P < 0.05) than with hulled barleys and oats (4.9 and 2.9 mMol/g DM incubated respectively). In contrast, oats generated higher ammonia (P <0.05) production (1.4 mMol/g DM incubated, on average) than barley (1.0 mMol/g). In conclusion, HB are better fermented in vitro, produce more beneficial (SCFA) and less harmful (ammonia) metabolites and have a better potential than other cereal species to modulate gut microbiota and improve gut health. [less ▲]

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See detailA coupled two-scale computational approach for masonry out-of-plane failure
Massart, T. J.; Mercatoris, Benoît ULg

in 12th International Conference on Fracture 2009, ICF-12 5 (2009)

The formulation of macroscopic constitutive laws for the behaviour of masonry is a complex task, due to its strongly heterogeneous microstructure which influences its overall mechanical behaviour. This ... [more ▼]

The formulation of macroscopic constitutive laws for the behaviour of masonry is a complex task, due to its strongly heterogeneous microstructure which influences its overall mechanical behaviour. This has triggered in the past decade the formulation of homogenisation methods, both for linear and damaging behaviours, and for in and out-of-plane loading conditions. This contribution deals with two-scale computational framework, in which the material behaviour of a structural masonry shell is sampled by resorting to computational homogenisation applied on a microstructural description of masonry constituents. The structural damaging behaviour is modelled by incorporating localising hinges in a coarse scale thin shell description. The appearance, the orientation and the softening mechanical response of these hinges are directly deduced from the computational homogenisation scheme. This procedure allows incorporating naturally the anisotropic damaging effects of the masonry material degradation. The contribution will illustrate the two-scale results by comparing them to full fine scale models. [less ▲]

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See detailEffect of breed on Doppler echocardiographic measurements in equids
Al Haidar, A; Sandersen, Charlotte ULg; Van Erck, Emmanuelle et al

in Proceedings of the 3rd Annual Congress of the European College of Equine Internal Medicine (ECEIM) (2009)

Detailed reference viewed: 16 (2 ULg)
See detailPublish or perish: how to survive in the publication jungle
Maréchal, Kevin ULg

Conference (2009)

Detailed reference viewed: 12 (1 ULg)
See detailDe notre détermination à nous aveugler... (Introduction)
Strivay, Lucienne ULg

in Echanges, Le vivant en ville, Symposium International 2 (2009)

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See detailMultiquark hadrons
Stancu, Floarea ULg

in Bled Workshops in Physics (2009), 10(1), 57-61

The possible production of multiquark systems is very important for our understanding of hadrons. A considerable interest in such states started with Jaffe's work in 1977, demonstrating the role of the ... [more ▼]

The possible production of multiquark systems is very important for our understanding of hadrons. A considerable interest in such states started with Jaffe's work in 1977, demonstrating the role of the chromomagnetic interaction in the stability of light multiquarks. Since then, heavy quarks have also been included. A brief survey is presented regarding the evolution of the problem. Some of the recently observed resonances, named X,Y or Z, are discussed as possible candidates for tetraquarks. [less ▲]

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See detailDevelopment of a practical test of insulin resistance in obese Beagle dogs and effects of sc FOS
Daumas, Caroline; Lhoest, Estelle; Hornick, Jean-Luc ULg et al

in Mussa, P. P.; Nery, J.; Schiavone, A. (Eds.) et al Congress Proceedings 13t h Congress of the ESVCN (2009)

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See detailSpecies delimitation and phylogeography of an African tropical tree species complex
Duminil, J.; Heuertz, M.; Bourland, Nils ULg et al

Poster (2009)

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See detailAn analysis of the random error affecting CO2 fluxes measured by eddy covariance
Laffineur, Quentin ULg; Heinesch, Bernard ULg; Aubinet, Marc ULg

Poster (2009)

This study focuses on random errors associated with eddy covariance flux measurements. This error is heteroscedastic, increases linearly with the flux magnitude and the error on CO2 flux decreases with ... [more ▼]

This study focuses on random errors associated with eddy covariance flux measurements. This error is heteroscedastic, increases linearly with the flux magnitude and the error on CO2 flux decreases with increasing wind speed. As random errors accumulate in quadrature, they are less critical than systematic errors as far as flux sums are concerned. On the other hand it may affect significantly half-hour data and pose problem for modelling or analysis of flux response to environmental parameters. It is therefore useful to characterize the site and the specific conditions under which the random error is the most important. The random error on CO2 flux was computed at two sites, one cropland and one forested site, by using the daily differencing approach (DDA, Hollinger and Richardson 2005). Relationships with flux and wind speed were compared between different periods (day vs. night, growing season vs. rest of the year) and for different flux computation methods. First, an increase of random error with decreasing wind speed was observed at low speed. This effect was not observed during the rest period at the cropland site and disappears when a high-pass filtering is applied to the data. It may be explained by two processes: on one hand, the below canopy air layer is less efficiently mixed which can create large flux variations when CO2 sources and sinks are separated. On the other hand, mesoscale motions may exceed small-scale turbulence at low wind speed. At similar wind speeds, the random error was lower at the cropland than at the forested site, which can be due to either process: indeed, at the cropland site, the distance between CO2 sources and sinks is smaller which reduce the low mixing effect but the site is also more flat and homogeneous which reduce the impact of mesoscale movements. The possibility of mesoscale movement impact is supported by the fact that the effect disappears when applying a high pass filtering. The random error was also found sensitive to the computational method: in particular it is larger when the flux is computed using the block average rather than the running mean, it increases when storage is taken into account and decreases when data are filtered by applying stationarity screening or u* filtering. [less ▲]

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