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See detailModel Identification and FE Simulations Effect of Different Yield Loci and Hardening Laws in Sheet Forming
Flores, Paulo; Duchene, Laurent ULg; Bouffioux, Chantal ULg et al

in International Journal of Plasticity (2007), 23(3), 420-449

The bi-axial experimental equipment [Flores, P., Rondia, E., Habraken, A.M., 2005a. Development of an experimental equipment for the identification of constitutive laws (Special Issue). International ... [more ▼]

The bi-axial experimental equipment [Flores, P., Rondia, E., Habraken, A.M., 2005a. Development of an experimental equipment for the identification of constitutive laws (Special Issue). International Journal of Forming Processes] developed by Flores enables to perform Bauschinger shear tests and successive or simultaneous simple shear tests and plane strain tests. Flores investigates the material behavior with the help of classical tensile tests and the ones performed in his bi-axial machine in order to identify the yield locus and the hardening model. With tests performed on one steel grade, the methods applied to identify classical yield surfaces such as [Hill, R., 1948. A theory of the yielding and plastic flow of anisotropic materials. Proceedings of the Royal Society of London A 193, 281–297; Hosford, W.F., 1979. On yield loci of anisotropic cubic metals. In: Proceedings of the 7th North American Metalworking Conf. (NMRC), SME, Dearborn, MI, pp. 191–197] ones as well as isotropic Swift type hardening, kinematic Armstrong–Frederick or Teodosiu and Hu hardening models are explained. Comparison with the Taylor–Bishop–Hill yield locus is also provided. The effect of both yield locus and hardening model choices is presented for two applications: plane strain tensile test and Single Point Incremental Forming (SPIF). [less ▲]

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See detailValLait - Lactation Curves Modelling
Gillon, Alain ULg; Gengler, Nicolas ULg

Computer development (2007)

calculation of 305-d lactation yields for Walloon dairy cows

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See detailMG-63 osteoblasts culture on poly-(lactic acid) degradable textiles for bone tissue regeneration
Moniotte, Nicolas; Pirotte, Fabrice; Borget, Pascal et al

Article for general public (2007)

This work shows that knitted PLA fabrics, seeded with human MG-63 osteoblasts can potentially be used as tissue engineered systems for in vitro to in vivo transition, for the treatment of bone defect

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See detailKarsts in sandstones and quatrzites of Minas Gerais, Brazil
Willems, Luc ULg; Rodet, J.; Pouclet, A. et al

Poster (2007)

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See detailOrientation and Order of Self-Assembled p-Benzenedimethanethiol Films on Pt(111) Obtained by Direct Adsorption and via Alkanethiol Displacement
Silien, Christophe; Dreesen, Laurent ULg; Cecchet, Francesca et al

in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter (2007), 111

Self-assembly of p-benzenedimethanethiol (p-BDMT) on Pt(111) has been investigated by high-resolution electron energy loss spectroscopy and sum-frequency generation spectroscopy. The molecules adsorb on ... [more ▼]

Self-assembly of p-benzenedimethanethiol (p-BDMT) on Pt(111) has been investigated by high-resolution electron energy loss spectroscopy and sum-frequency generation spectroscopy. The molecules adsorb on Pt-(111) like on gold, attached through one single thiol, leaving the second thiol moiety unreacted and exposed to the outer surface. Yet, the order of the p-BDMT self-assembled film is poor in comparison to alkanethiol SAMs. Displacement in solution of a preadsorbed pentanethiol (PTT) SAM by p-BDMT molecules proved to be a successful approach to achieve films of higher quality, where the size of the dithiol molecular domains tends toward the size measured for PTT. Nearly complete exchange is accomplished after 42 h. However, no significant exchange is observed when dodecanethiol replaces PTT. Displacing the alkanethiols by benzenethiol leads to the same conclusions, suggesting that the exchange processes are lessened as compared to gold. [less ▲]

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See detailBistouri ultracision en chirurgie thyroïdienne
COIMBRA MARQUES, Carla ULg; Defechereux, thierry; Meurisse, Nicolas ULg et al

in Revue Médicale de Liège (2007), 62 Spec No

The thyroid gland is highly vascularized and, in all Thyroid surgery, a special attention must be paid to haemos. tasis and coagulation. Any carelessness in the control of thyroid vessels can indeed ... [more ▼]

The thyroid gland is highly vascularized and, in all Thyroid surgery, a special attention must be paid to haemos. tasis and coagulation. Any carelessness in the control of thyroid vessels can indeed entail serious consequences. In this respect, the ultrasonic scalpel represents a significant progress. In this paper, the ultrasonic dissector will first be presented. Then a prospective, randomized trial comparing the results obtained with this apparatus to those obtained with the conventional method of hemostasis in a series of 34 patients submitted to total thyroidectomy for multinodular goiter will be summarized. Without increasing the costs, the ultrasonic dissector allows a saving of operative time as well as a reduction of peroperative bleeding and of postoperative use of antalgics. Finally, the results of 1696 total thyroidectomies performed with the use of the ultrasonic dissector will be briefly outlined. [less ▲]

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See detailSpatial dynamics of rRNAs within the cell nucleus
Thiry, Marc ULg; Lamaye, Françoise; Thelen, Nicolas ULg et al

Poster (2007)

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See detailA new interpretation of the Io UV footprint morphology
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2007)

The electromagnetic interaction between Io and the jovian magnetic field leads to an auroral UV footprint consisting of single or multiple UV spots in both jovian hemi- spheres. According to current ... [more ▼]

The electromagnetic interaction between Io and the jovian magnetic field leads to an auroral UV footprint consisting of single or multiple UV spots in both jovian hemi- spheres. According to current theories, the perturbation induced by the motion of Io in the plasma torus propagates along the field lines in the form of Alfvén waves and finally causes electron precipitation in the jovian ionosphere. The occurrence and mul- tiplicity of the secondary spots appear to be related to the position of Io in the plasma torus and have been attributed to partial reflections of the Alfvén waves on the torus boundaries. Nevertheless, the discrepancies between the predicted inter-spot distances and the measurements were found difficult to explain. Additionally, some crucial con- figurations of Io in the torus had never been observed. Our recent HST/ACS observations of the footprint in so far unexplored Io-plasma torus configurations lead to the finding of a new feature in the footprint: a faint spot upstream of the main spot. The observations of this precursor emission, together with the inconsistencies related to the inter-spot distances, suggest a new interpretation of the footprint morphology. We propose that the precursor and the first secondary spot stem from the same mechanism and we interpret them as the counterparts of the main spot occurring in the opposite hemisphere. [less ▲]

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See detailEvaluation of oral corticosteroids and phosphodiesterase-4 inhibitor on the acute inflammation induced by inhaled lipopolysaccharide in human.
Michel, Olivier; Dentener, Mieke; Cataldo, Didier ULg et al

in Pulmonary Pharmacology & Therapeutics (2007), 20(6), 676-83

Background Endotoxins are pro-inflammatory substances present in the environment. In man, inhalation of its purified derivative lipopolysaccharide (LPS) induces inflammation related to macrophages and ... [more ▼]

Background Endotoxins are pro-inflammatory substances present in the environment. In man, inhalation of its purified derivative lipopolysaccharide (LPS) induces inflammation related to macrophages and neutrophils. Corticosteroids and phosphodiesterase (PDE)-4 inhibitors have inhibiting effects on macrophages and neutrophils, respectively. This study investigated the effect of prednisolone and of the PDE-4 inhibitor cilomilast on the LPS-induced acute inflammation. Methods The study was a placebo-controlled, double-blind crossover design. On three occasions, at 2 weeks interval, 16 healthy subjects inhaled 50 μg LPS after a 6-day treatment with cilomilast (15 mg bd), prednisolone (10 mg bd) or placebo. For the assessment of the inflammatory response, induced sputum was obtained before inclusion and 6 h post-LPS while blood samples were collected before, 6 and 24 h post-LPS. Results Inhaled LPS induced an increase in sputum neutrophils (p<0.0001), logMMP-9 (p<0.05), logMMP-9/TIMP-1 (p<0.01) and logTNF-α (p<0.02). At the blood level there were significant rise in neutrophilia (p<0.001), E-selectin (p<0.02), C-reactive protein (CRP) (p<0.001) and LPS-binding protein (p<0.001). There was both a slight, but not significant, increase in body temperature and decrease in forced expiratory volume in 1 s (FEV1). Neither prednisolone nor cilomilast had protective effect on the LPS-induced airways’ inflammation. The LPS-induced CRP acute-phase protein of inflammation (0.58±0.13 and 3.52±0.41 mg/dL, before and after LPS, respectively) was significantly inhibited by a pre-treatment with prednisolone (1.39±0.32 mg/dL, p<0.01) and attenuated (2.65±0.30 mg/dL, p=0.09) with cilomilast. Conclusion In healthy subjects, while the LPS-induced airways’ inflammation was not modified either by oral prednisolone or by PDE-4 inhibitor cilomilast (at actual dosage), the LPS-induced acute phase of blood inflammation was reduced by prednisolone. [less ▲]

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See detailWithin-Population Genetic Structure And Clonal Diversity Of A Threatened Endemic Metallophyte, Viola Calaminaria (Violaceae)
Bizoux, Jean-Philippe ULg; Mahy, Grégory ULg

in American Journal of Botany (2007), 94(5), 887-895

We studied the within-population genetic structure and the clonality extent of Viola calaminaria, a rare endemic species of calamine soils, by means of RAPD markers in two populations (one recent and one ... [more ▼]

We studied the within-population genetic structure and the clonality extent of Viola calaminaria, a rare endemic species of calamine soils, by means of RAPD markers in two populations (one recent and one ancient) with expected harsh and heterogeneous heavy-metal stress. At a very local scale (0.2 3 m), clonal propagation was detected in both populations, but the levels of clonal diversity were high (number of genets/number of ramets sampled ¼ 0.9 [recent] and 0.76 [ancient]) and the maximal observed extension of the clones was 0.4 m. This indicated that clonality is not, for the species, an important mode of propagation and that clonal growth cannot be interpreted as a strategy for propagating or perpetuating adapted genotypes under harsh ecological constraints. Spatial autocorrelations revealed a significant (P , 0.001) negative value of correlogram slope in the two populations even when a single individual per clone was considered (i.e., analysis at the genet level). We conclude that spatial genetic structure at a very local scale reflects limited gene flow due to restricted seed dispersal rather than variation in clonal pattern in response to environmental heterogeneity. At a larger scale (2–30 m), spatial autocorrelations revealed a positive (P , < 0.001) correlation at , 3 m and a random pattern at larger distances for the two populations. This suggested a patchy distribution of the genetically linked individuals associated with a disrupted pattern at a longer distance probably due to gene flow by pollen dispersal and a seed bank effect. The implications for the conservation of V. calaminaria are discussed. [less ▲]

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See detailSmoothing the mosaic subclinical melanoderma by calcipotriol.
Pierard, Claudine ULg; Paquet, Philippe ULg; Quatresooz, Pascale ULg et al

in Journal of the European Academy of Dermatology & Venereology (2007), 21(5), 657-61

BACKGROUND: The observation of photo-exposed skin under ultraviolet light reveals a mosaic pattern of varying intensity in epidermal melanization. Several patterns of mosaic subclinical melanoderma (MSM ... [more ▼]

BACKGROUND: The observation of photo-exposed skin under ultraviolet light reveals a mosaic pattern of varying intensity in epidermal melanization. Several patterns of mosaic subclinical melanoderma (MSM) have been described using a specially designed CCD camera and the ultraviolet light-enhanced visualization (ULEV) method. Vitamin D(3) and its analogues influence the biology of keratinocytes and melanocytes. OBJECTIVE: To assess the effect of calcipotriol on MSM. METHODS: This randomized split-face study was conducted in 27 men to compare the effect of once daily applications of 5% calcipotriol cream or a moisturizing cream on the heterogeneity of facial MSM. Computerized image analysis of video images was used at 1-month intervals before and during a 2-month treatment, as well as during a 3-month follow-up. RESULTS: At both sites, the average melanin content of the epidermis showed no significant change over time. However, the mottled appearance was smoothened at the calcipotriol site, whereas it was increased at the site receiving the moisturizer. CONCLUSION: The decreased heterogeneity in MSM after calcipotriol applications suggests a control of the epidermal melanocyte unit by the vitamin D(3) derivative. [less ▲]

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See detailCharlotte Joulia
Tomasovic, Dick ULg

in Aubenas, Jacqueline (Ed.) Filmer la danse (2007)

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See detailPierre Barré
Tomasovic, Dick ULg

in Aubenas, Jacqueline (Ed.) Filmer la danse (2007)

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See detailLa gestión del medio ambiente: aporte teóricos y metodológicos de la sociología en el caso del desarrollo ecoturístico de la Vía Parque Isla de Salamanca
Escobar Jimenez, Kelly ULg

Master's dissertation (2007)

Este trabajo estudia los procesos de gestión ambiental relacionados con el desarrollo ecoturístico de la VIPIS. Para esto se analizan las interacciones de los actores de la VIPIS y sus formas de ... [more ▼]

Este trabajo estudia los procesos de gestión ambiental relacionados con el desarrollo ecoturístico de la VIPIS. Para esto se analizan las interacciones de los actores de la VIPIS y sus formas de apropiación y utilización del medio ambiente; se exploran las posibilidades del desarrollo ecoturístico negociado en la VIPIS; y analizando el trasfondo del concepto de comunidad, y reflexionando sobre los tipos de participación para el caso del Parque Natural, se propone y explora la “Gestión ambiental Comunitaria”. A lo largo del texto se presentan los aportes metodológicos y teóricos de la sociología en el campo de la gestión ambiental. [less ▲]

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See detailRandom subwindows and extremely randomized trees for image classification in cell biology
Marée, Raphaël ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

in BMC Cell Biology (2007), 8(Suppl. 1),

Background: With the improvements in biosensors and high-throughput image acquisition technologies, life science laboratories are able to perform an increasing number of experiments that involve the ... [more ▼]

Background: With the improvements in biosensors and high-throughput image acquisition technologies, life science laboratories are able to perform an increasing number of experiments that involve the generation of a large amount of images at different imaging modalities/scales. It stresses the need for computer vision methods that automate image classification tasks. Results: We illustrate the potential of our image classification method in cell biology by evaluating it on four datasets of images related to protein distributions or subcellular localizations, and red-blood cell shapes. Accuracy results are quite good without any specific pre-processing neither domain knowledge incorporation. The method is implemented in Java and available upon request for evaluation and research purpose. Conclusion: Our method is directly applicable to any image classification problems. We foresee the use of this automatic approach as a baseline method and first try on various biological image classification problems. [less ▲]

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See detailEvaluation de l’efficacité du Caprofène lors de bronchoneumonie expérimentale bovine à Mannheimia haemolytica
Wallemacq, Hugues; Boutet, Philippe; Zecchinon, L. et al

in Revue de Médecine Vétérinaire (2007), 158(8-9), 418-424

M. haemolytica serotype A1 (formerly known as Pasteurella) is the most important and commonly isolated bacterial pathogen from fatal cases of bovine fibrinous pleuroneumonia. M. haemolytica and its two ... [more ▼]

M. haemolytica serotype A1 (formerly known as Pasteurella) is the most important and commonly isolated bacterial pathogen from fatal cases of bovine fibrinous pleuroneumonia. M. haemolytica and its two principal toxins, the lipopolysaccharides (LPS) and the leukotoxin (LktA) induce the recruitment, the activation and the necrosis of neutrophils involved in the pathogenicity of bovine pneumonic mannheimiosis (BPM). The objective of this study was to determine whether systemic therapy with carprofène (Rimadyl®*), a non-steroidal anti-inflammatory drug, improves the disease development in an acute experimental model of BPM. The experimental pathology was induced by trans-tracheal inoculation of M. haemolytica and toxins at T0. One hour post-inoculation, six calves were treated intravenously with carprofen (1,4 mg/kg) while six placebo-treated calves received dose-matched volumes of sterile saline. The clinical and biochemical parameters were measured at one (T+1), three (T+3) and seven (T+7) hours after inoculation. Disease scores for carprofen treated calves were significantly lower than those for placebo-treated controls six hours (T+7) after treatment. These results were associated to a significantly oxygen saturation decrease at T+3 and a significantly blood lactate increase at T+7 in the control calves. Moreover, pulmonary lesions were significantly less extensive than those in the control group. Taken together, this finding suggest that pharmacological modulation by carprofen of pulmonary inflammation after appearance of acute BPM clinical signs leads to calves’ health enhancement and reduces the extent of gross pneumonic lesion. [less ▲]

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See detailLa co-construction de soi et de ses savoirs professionnels comme effet de l'alternance: quels indicateurs?
Vanhulle, Sabine; Mottier Lopez, Lucie; Deum, Mélanie ULg

in Merhan, France; Ronveaux, Christophe; Vanhulle, Sabine (Eds.) Alternances en formation (2007)

Cette contribution porte sur la construction de savoirs professionnels dans l'alternance en formation initiale à l'enseignement. Elle postule que cette construction de savoirs se relie à l'émergence de l ... [more ▼]

Cette contribution porte sur la construction de savoirs professionnels dans l'alternance en formation initiale à l'enseignement. Elle postule que cette construction de savoirs se relie à l'émergence de l'identité professionnelle: le sujet en formation se construit comme acteur social en même temps des savoirs propices à son agir. Plus précisément, notre préoccupation de recherche concerne les indicateurs de cette co-construction soi/savoirs professionnels tels qu'on peut les inférer à partir de l'analyse de discours écrits ou oraux produits par les étudiants. [less ▲]

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