References of "Scientific congresses and symposiums"
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See detailPredicting bovine milk urea concentration for future test-day records in a management perspective
Bastin, Catherine ULg; Laloux, Laurent; Bertozzi, Carlo et al

in Proceedings of the British Society of Animal Science (2008)

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See detailEffect of acepromazine on whole blood viscosity in horses
Sandersen, Charlotte ULg; Serteyn, Didier ULg; Dringenberg, Bernhard et al

in Proceedings of the AVA Spring Meeting (2008)

Detailed reference viewed: 46 (13 ULg)
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See detailPrevention of low back injuries in sports
Vanderthommen, Marc ULg

in Isokinetics & Exercise Science (2008), 16(3), 171

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See detailExperimental study of the interaction between a turbulent flow and a river biofilm growing on macrorugosities
Moulin, F. Y.; Peltier, Yann ULg; Bercovitz, Y. et al

in International Conference in Hydroscience and Engineering 2008 (2008)

Detailed reference viewed: 8 (0 ULg)
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See detailAphid – ant mutualism : How do aphids focus ant foraging ?
Verheggen, François ULg; Diez, Lise; Detrain, Claire et al

Poster (2008)

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See detailA blue oxidase from the white continent
Roulling, Fredéric; Verté, F.; Feller, Georges ULg

Poster (2008)

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See detailInterprétation et textualité : une adresse ad libitum
Badir, Sémir ULg; Normand, Claudine

in Badir, Sémir; Klinkenberg, Jean-Marie; Houdebine, Anne-Marie (Eds.) et al Actes du colloque international « Sémiologie 2005 » : Les Aventures de l’interprétation (2008)

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See detailPhospholipids quantification in vegetable oil degumming residues by HPLC-ELSD
Pierart, Céline ULg; Danthine, Sabine ULg; Wathelet, B et al

Poster (2008)

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See detailMisdiagnosis of vitamin D insufficiency in subjects who received vitamin D2
Cavalier, Etienne ULg; Wallace, Andrew Michael; Mistretta, Virginie ULg et al

in Clinical Chemistry (2008), 54(6), 110

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See detailExploiting tree-based variable importances to selectively identify relevant variables
Huynh-Thu, Vân Anh ULg; Wehenkel, Louis ULg; Geurts, Pierre ULg

in JMLR: Workshop and Conference Proceedings (2008), 4

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See detailHafting Traces on Flint Tools
Rots, Veerle ULg

in Longo, Laura; Della Riva, Martina (Eds.) Proceedings of the Congress "Prehistoric Technology: 40 years later. Functional Studies and the Russian Legacy" (2008)

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See detailReintroduction & effects on their environment of indigenous plants of the Cerrado
Buisson, Elise; Le Stradic, Soizig ULg; Negreiros, Daniel et al

Poster (2008)

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See detailLong-term fluctuations (1979 – 2008) of the phytoplankton dynamics in the Bay of Calvi (Corsica, NW Mediterranean): relations with wind stress variability and NAO index
Goffart, Anne ULg; Hecq, Jean-Henri ULg

Conference (2008)

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that ... [more ▼]

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that changes in environmental conditions in the Corsican sector have altered the coastal phytoplankton dynamics and induced a drastic reduction of the winter-spring phytoplankton biomass over the last three decades. At the local scale, variations in winter wind stress control the development of the winter-spring phytoplankton bloom and the structure of the phytoplankton assemblages. Results emphasize that the total phytoplankton biomass (chl a) is higher during high winter wind stress years. From a specific point of view, flagellates are always the dominant component of the phytoplankton bloom communities. However, diatoms tend to be more abundant during high winter wind stress years. At a wider scale, a link between the intensity of the phytoplankton bloom and the winter NAO index is established. Lastly, the decrease in phytoplankton abundance coincides with changes in zooplankton populations. As a consequence, the entire pelagic food web dynamics is affected by climate variations and the ecosystem resilience is threatened. [less ▲]

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See detailLes insctruments de la fiscalité environnementale
Bourgeois, Marc ULg

Conference (2008)

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See detailHypoxia promotes resistance to etoposide by regulating p53 stability and c-jun DNA-binding activity
Cosse, Jean-Philippe ULg; Ronvaux, Marie; Ninane, Noelle et al

Conference (2008)

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See detailImpact of different spectroscopic datasets on CH4 retrievals from Jungfraujoch FTIR spectra
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Demoulin, Philippe ULg et al

(2008)

Due to its high warming potential and its relatively long chemical lifetime (~9 years), atmospheric methane (CH4) plays a major role in the radiative forcing responsible of the greenhouse effect. Methane ... [more ▼]

Due to its high warming potential and its relatively long chemical lifetime (~9 years), atmospheric methane (CH4) plays a major role in the radiative forcing responsible of the greenhouse effect. Methane also affects climate by influencing tropospheric ozone and stratospheric water. High quality methane data sets are needed to understand its cycle and evaluate its budget of sources and sinks. Methane vertical distribution as well as total and partial column time series can be retrieved from high-resolution ground-based FTIR spectra, using, e.g., the SFIT-2 algorithm which implements the Optimal Estimation Method of Rodgers . However, although several retrieval approaches characterized by relatively high information content exist, methane retrieved profiles very often present large oscillations in their tropospheric range, which might result partly from inappropriate or inconsistent parameters. Significant improvements on retrieval quality should therefore be reached by using more accurate or compatible CH4 spectroscopic data. The main purpose of this contribution is to test and compare three different sets of CH4 spectroscopic parameters and to quantify their impact on CH4 retrieved products as well as on the fitting quality. [less ▲]

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See detailFairness issues in software virtual routers
Egi, N.; Greenhalgh, A.; Handley, M. et al

in Proceedings of the ACM workshop on Programmable routers for extensible services of tomorrow (2008)

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See detailReDrop – An Efficient Monte-Carlo Method for Simulating Extraction Columns
Kalem, Murat; Pfennig, Andreas ULg

Conference (2008)

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See detailA Search for Escaping Water from Ceres' Poles
Rousselot, P.; Mousis, O.; Dumas, C. et al

in Asteroids, Comets, Meteors 2008 (2008)

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See detailMarine and fresh water palynomorphs from the Jauf Formation, Northwest Saudi Arabia
Miller, A.; Breuer, P.; Al-Ghazi, A. et al

Conference (2008)

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See detailImpact of the plant protection practices on the operators' exposure: survey by the communes and ministry of equipment and transport (MET-RW)
Godeaux, Denis; Schiffers, Bruno ULg; Culot, Marc ULg

in Communications in Agricultural and Applied Biological Sciences (2008)

In order to gain a better understanding of non-agricultural pesticide use and to prepare the legislative and technical dossiers required under the Water Framework Directive, between October 2006 and March ... [more ▼]

In order to gain a better understanding of non-agricultural pesticide use and to prepare the legislative and technical dossiers required under the Water Framework Directive, between October 2006 and March 2007, two surveys were conducted of 97 Walloon communes and 65 districts of the Walloon Ministry of Public Works and Transport (MET) (General Directorates for Motorways and Roads and for Waterway Infrastructure). The questionnaire (26 questions on six topics) was sent by e-mail or fax, with a response rate of 60 out of 97 communes and 33 out of 65 districts. This article describes the health-related aspects of the surveys (environmental aspects are the subject of separate article). The surveys have brought to light a number of bad practices and a growing awareness of the non-agricultural users with respect to health risks. However, bad habits, legislation infringements and a failure to follow good plant protection practice are still a problem and pose major health risks (which endanger the operator and the public). Information, awareness-raising and, especially, training of people therefore remain a priority for nonagricultural users. [less ▲]

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See detailEléments de synthèse sur l’écologie de Pericopsis elata au Sud-Est du Cameroun
Bourland, Nils ULg; Doucet, Jean-Louis ULg

in Rapport général de l’Atelier OIBT/CITES sur l’Afrormosia (Kribi, Cameroun, 02.04.-04.04.08.) (2008)

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See detailPrix de l’alimentation : une hausse sans faim
Duquesne, Brigitte ULg

Conference (2008)

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See detailGlobally stabilizing quasi time-optimal control of planar saturated linear systems
Forni, Fulvio ULg; Galeani, Sergio; Zaccarian, Luca

in 16th Mediterranean Conference on Control and Automation (2008) (2008)

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See detailLong term Subjective Evaluation of the Effects of Vocal Therapy on Dysfunctional Dysphonia.
Morsomme, Dominique ULg; Faurichon de la Bardonnie, Marie; Verduykt, Ingrid et al

Conference (2008)

The goal of this study is the evaluation of the long-term efficiency of voice therapy (> to 6 months) in the treatment of dysfunctional dysphonia . Four subjective measurements were performed on 29 ... [more ▼]

The goal of this study is the evaluation of the long-term efficiency of voice therapy (> to 6 months) in the treatment of dysfunctional dysphonia . Four subjective measurements were performed on 29 patients: -A visual analogical scale (VAS) ranging from 0 (not efficient at all) to 100 (very efficient). -A question “Is the speech therapy still efficient?” Yes or no. -The G(rade), R(oughness) and B(reathiness) parameters from the GRBAS perceptual scale (evaluated by the patient measured on VAS). -The Voice Handicap Index-10 (VHI-10). The results show that 76% of the patients consider that the voice therapy is still efficient. In regard to G.R.B., we observe a high score for G (median: 77). The score for R is lower (median R: 12). G and R are significantly correlated (r Spearman=0.516, p=0.004), but the satisfaction of the vocal quality does not seem correlated to B (p=0,251, NS). The median values of VHI 10 shows a significant improvement from 15 to 10 (p=0,017). In addition, the correlations between the judgment on the treatment efficiency and vocal quality (r=0,623, p<0,001) and between VHI-10 and the length of treatment (r=0.416, p=0,035) are significant. The first correlation shows that the most satisfied patients when it comes to the vocal therapy are also the most satisfied when it comes to their vocal quality. The second correlation specifies that the longer the treatment, the higher the grade of vocal handicap. Voice therapy is efficient in the long term and is worth to be prolonged for difficult cases [less ▲]

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See detailSivers function in constituent quark models
Scopetta, S.; Courtoy, Aurore ULg; Fratini, F. et al

in World scientific (2008)

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See detailProtection des races animales locales menacées en Région wallonne
Burny, Philippe ULg; Mulders, Christian

Poster (2008)

L'intensification des élevages et la recherche de hautes performances zootechniques a eu notamment pour conséquence la mise en évidence d'un nombre restreint de races sur lesquelles tous les efforts de ... [more ▼]

L'intensification des élevages et la recherche de hautes performances zootechniques a eu notamment pour conséquence la mise en évidence d'un nombre restreint de races sur lesquelles tous les efforts de sélection se sont concentrées. Indirectement, de nombreuses races locales, pourtant bien adaptées à leur milieu spécifique, se sont vues de plus en plus marginalisées, au point même de se voir menacées de disparition. Pour lutter contre cet aspect négatif des progrès de l'élevage, des mesures ont été prises par l'Europe afin d'aider au maintien d'un patrimoine génétique potentiellement intéressant pour l'avenir. [less ▲]

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See detailThe Old English copula weorðan and its replacement in Middle English
Petré, Peter ULg; Cuyckens, Hubert

in Gotti, Maurizio; Dossena, Marina; Dury, Richard (Eds.) English historical linguistics 2006. Volume I Historical syntax and morphology. Selected papers from the fourteenth International Conference on English Historical Linguistics (ICEHL 14), Bergamo, 21-25 August 2006 (2008)

With the aid of a specially compiled corpus, this paper accounts for the replacement – mainly by become – of weorðan ‘become’, whose use rapidly decreased in Middle English. Drawing on Goldbergian ... [more ▼]

With the aid of a specially compiled corpus, this paper accounts for the replacement – mainly by become – of weorðan ‘become’, whose use rapidly decreased in Middle English. Drawing on Goldbergian construction grammar, the paper posits the existence of a lexeme-independent network of copular constructions [Copula + np/ap/…]. Copular uses of weorðan are associated with this network, but also form part of a second network exclusive to weorðan, which, already in Old English, served as a model for the extension of becuman to copular uses. In early Middle English, weorðan reacted to changes in the lexeme-independent copular network. Weorðan was no longer used with adjectival participles when these were constructionally separated from its most frequent collocates, namely human propensity adjectives. Furthermore, reacting to an influx of various adjectives in predicate position, becuman, which had no collocational preferences, extended its use to these adjectives and eventually took over from weorðan completely. [less ▲]

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See detailHigh-density resolution synchrotron radiation based X-ray microtomography (SRμCT) for quantitative 3D-morphometrics in zoological sciences
Nickel, Michael; Hammel, Jörg U.; Herzen, Julia et al

in SPIE Optical Engineering+Application Conference, San Diego, California, USA, 10--14 August 2008 (2008)

best suitable methods like tomography allow for a direct representation of 3D-structures. In recent years, synchrotron radiation based x-ray microtomography (SR μCT) placed high resolutions to the ... [more ▼]

best suitable methods like tomography allow for a direct representation of 3D-structures. In recent years, synchrotron radiation based x-ray microtomography (SR μCT) placed high resolutions to the disposal of morphologists. With the development of highly brilliant and collimated third generation synchrotron sources, phase contrast SR μCT became widely available. A number of scientific contributions stressed the superiority of phase contrast over absorption contrast. However, here we demonstrate the power of high density resolution methods based on absorption-contrast SRμCT for quantitative 3D-measurements of tissues and other delicate bio-structures in zoological sciences. We used beamline BW2 at DORIS III (DESY, Hamburg, Germany) to perform microtomography on tissue and mineral skeletons of marine sponges (Porifera) which were shock frozen and/or fixed in a glutamate osmium tetroxide solution, followed by critical point drying. High density resolution tomographic reconstructions allowed running quantitative 3D-image analyses in Matlab and ImageJ. By applying contrast and shape rule based algorithms we semi-automatically extracted and measured sponge body structures like mineral spicules, elements of the canal system or tissue structures. This lead to a better understanding of sponge biology: from skeleton functional morphology and internal water flow regimes to body contractility. Our high density resolution based quantitative approach can be applied to a wide variety of biological structures. However, two prerequisites apply: (1) maximum density resolution is necessary; (2) edge effects as seen for example in phase outline contrast SR μCT must not be present. As a consequence, to allow biological sciences to fully exploit the power of SR μCT further increase of density resolution in absorption contrast methods is desirable. [less ▲]

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See detailMultiplicity of O-type stars in NGC 2244
Mahy, Laurent ULg; Nazé, Yaël ULg; Rauw, Grégor ULg et al

Poster (2008)

We present the main results from our long‐term spectroscopic campaign devoted to the O‐type stars in the young open cluster NGC 2244. Previous works by our team on the O‐stars multiplicity in other young ... [more ▼]

We present the main results from our long‐term spectroscopic campaign devoted to the O‐type stars in the young open cluster NGC 2244. Previous works by our team on the O‐stars multiplicity in other young open clusters (IC 1805 and NGC 6231) showed that the number of binary systems in such clusters was larger than 40%. Until now, only two stars (HD 47129 and HD 48099) in the surroundings of NGC 2244 have been confirmed as spectroscopic binaries (SB) although Garcia & Mermilliod (2001) estimated the O‐type binary fraction at 50%. In this context, we revisited the spectral classification, the projected rotational velocity and the multiplicity of O‐type stars in NGC 2244. [less ▲]

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See detail3-D gas exchange pathways in pome fruit characterised by synchrotron X-ray computed tomography
Verboven, Pieter; Kerckhofs, Greet ULg; Mebatsion, Hibru K. et al

Conference (2008)

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See detailTowards a new definition of Cooksonia Lang, 1937
Gonez, Paul ULg; Gerrienne, Philippe ULg

Conference (2008)

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See detailSeasonal variability of CO2 fluxes in the tropical lagoons of Ivory Coast
Koné, Y. J. M.; Gourene, G.; Abril, G. et al

Poster (2008)

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See detailThe Early Devonian plants from the Ancenis Basin (Armorican Massif, France): one century later...
Strullu-Derrien, Marie-Christine; Gerrienne, Philippe ULg

Conference (2008)

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See detailAnalyse du contexte de formation d’un jeune athlète. Etude de cas
Theunissen, Catherine ULg; Pauly, Alain; Cloes, Marc ULg

in Wallian, N.; Poggi, M. P.; Musard, M. (Eds.) Co-construire des savoirs : les métiers de l’intervention dans les APSA. Actes du colloque ARIS (2008)

Nous nous sommes intéressés à un jeune espoir sportif belge pour lequel nous avons tenté de modéliser la structure d’encadrement. Pour ce faire, nous avons opté pour des entretiens exploratoires ... [more ▼]

Nous nous sommes intéressés à un jeune espoir sportif belge pour lequel nous avons tenté de modéliser la structure d’encadrement. Pour ce faire, nous avons opté pour des entretiens exploratoires semi‐directifs dans les milieux familial, sportif et scolaire de l’athlète. L’analyse des informations recueillies nous a permis de dévoiler la qualité de la structure actuellement mise en place et, notamment, le rôle déterminant du père qui se charge de coordonner et de contrôler l’ensemble de celle‐ci. Notre étude a également conscientisé les acteurs sur le fonctionnement de la structure et s’est montrée efficace pour améliorer les relations entre les principaux acteurs. [less ▲]

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See detailLate Devonian plants from Australia: the anatomically preserved flora from Barraba, New South Wales.
Meyer-Berthaud, Brigitte; Blanchard, Romain; Decombeix, Anne-Laure et al

Conference (2008)

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See detailModal analysis of mineral blends using optical image analysis versus X ray diffraction
Bouzahzah, Hassan; Califice, Arnaud ULg; Benzaazoua, Mostafa et al

in GU, Ying; BUTCHER, Alan; STEELE, David (Eds.) Proceedings of International Congress for Applied Mineralogy ICAM08 (2008)

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See detailLa démarche RAI et le domicile
Gosset, Christiane ULg

Conference (2008)

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See detailOptical Spectroscopy of the B and C Fragments of Comet 73P/Schwassmann-Wachmann 3 at the ESO VLT
Jehin, Emmanuel ULg; Manfroid, Jean ULg; Kawakita, H. et al

in LPI contribution 1405 (2008)

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See detailBedusted, yet not beheaded: The role of be-’s constructional properties in its conservation
Petré, Peter ULg; Cuyckens, Hubert

in Bergs, Alexander; Diewald, Gabriele (Eds.) Constructions and Language Change: Selected papers from the Workshop on Constructions and Language Change, XVII International Conference on Historical Linguistics (2008)

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See detailInfluence of nitrogen fertilizer treatments on soft wheat starch characteristics
Massaux, Carine; Sindic, Marianne ULg; Lenartz, Jonathan et al

Poster (2008)

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See detailModelling the Excavated damage zone around an underground gallery- Coupling mechanical, thermal and hydraulical aspects
Charlier, Robert ULg; Chambon, René; Li, Xiang Ling et al

in Management and Disposal of Radioactive Waste Euradwast’08 (2008)

A zone with significant irreversible deformations and significant changes in flow and transport properties is expected to be formed in clay around underground excavations. The stress perturbation around ... [more ▼]

A zone with significant irreversible deformations and significant changes in flow and transport properties is expected to be formed in clay around underground excavations. The stress perturbation around the excavation could lead to a significant increase of the permeability, related to diffuse and/or localized crack propagation in the material. Further the drainage and the heating of disposal will modified the size and the structure of the damage zone. The main objective of the study is to model these processes at small and large scale in order to assess their impacts on the performance of radioactive waste geological repositories. This paper concerns more particularly the thermo-hydro-mechanical modelling of a hollow cylinder experiment performed in Boom Clay and the hydro-mechanical modelling of a long term dilatometer experiment performed in Opalinus Clay at Mont Terri Rock Laboratory in Switzerland. This study shows that simple models already permit to reproduce the behaviours observed experimentally. [less ▲]

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See detailInteraction between virus like particles (VLP) and natural killer (NK) cells
Renoux, Virginie ULg; Dortu, Estelle ULg; Provenzano, Fabian et al

in Acta Clinica Belgica (2008), 2

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See detailLigand binding to tetra-end-linked (TGGGGT)4 G-quadruplexes: an electrospray mass spectroscopy study
Amato, Jussara; Oliviero, Giorgia; Borbone, Nicola et al

in Nucleic Acids Symposium Series (2008), 52

The binding properties of a series of known G-quadruplex ligands have been studied by ESI-MS experiments. The tetramolecular (TG(4)T)(4) quadruplex and its analogues I and II blocked, respectively, at the ... [more ▼]

The binding properties of a series of known G-quadruplex ligands have been studied by ESI-MS experiments. The tetramolecular (TG(4)T)(4) quadruplex and its analogues I and II blocked, respectively, at the 3' or 5'-end by a tetra-end-linker (TEL) unit were chosen as the ligands targets. The stoichiometries of the obtained complexes as well as the ligand affinity and selectivity to the different quadruplexes were determined to deduce the ligand binding site. The TEL derivatives I and II allowed the probing of the grooves contribution to the binding of ligands to G-quadruplexes, demonstrating that the 3' and 5' quartets are not equivalent binding sites for ligand end-stacking. [less ▲]

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See detailA shimming procedure for fMRI, optimizing the local BOLD sensitivity
Balteau, Evelyne ULg; Weiskopf, Nikolaus

in Proceedings of the International Society for Magnetic Resonance in Medicine (2008), 16

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See detailProteomic analysis of telomerase inhibition by telomere specific ligands
Mazzucchelli, Gabriel ULg; Gabelica, Valérie ULg; Smargiasso, Nicolas ULg et al

in Anticancer Research (2008), 28(5c), 3257-3258

Telomeres consist of protein complexes and repeated ‘TTAGGG’ double strand DNA sequences ended by a 3’ single strand DNA of the same sequence. Progressive telomere shortening is observed in vitro upon ... [more ▼]

Telomeres consist of protein complexes and repeated ‘TTAGGG’ double strand DNA sequences ended by a 3’ single strand DNA of the same sequence. Progressive telomere shortening is observed in vitro upon cell divisions and with ageing in vivo. At a critical telomere length, shortened telomeres trigger a permanent growth arrest known as replicative senescence. Telomerase is an RNA-dependent DNA polymerase that extends telomeres by adding ‘TTAGGG’ repeats. It consists of a functional RNA component (hTR) which serves as template and a catalytic protein (hTERT) with reverse transcriptase activity. The expression of hTERT alone is sufficient for the immortalisation of cells. Telomerase is highly expressed in tumor cells but at very low level in most somatic cells. These observations make the telomerase an attractive target for anticancer strategies. One of these strategies relies on the use of drug candidates able to stabilize the particular telomere G-quadruplex DNA structures. The stabilization of these structures makes the telomere inaccessible for telomerase and thus inhibits telomerase activity. The effect of the hTERT transfection was first studied on the proteome of human WI38 fibroblast cells (1). Then, the proteome alteration response of hTERT transfected WI38 cells induced by the treatment of two G-quadruplexes ligands, telomestatin and TMPyP4, was analyzed. Both compounds can inhibit telomerase but have different selectivity for the different G-quadruplexes structures. Proteome analysis of the treated cells reveals that TMPyP4 induces much more protein expression alterations than telomestatin probably due to its poor selectivity. TMPyP4 induces especially a drastic down expression of the hnRNPs, a modulation of the proteasome pathway, an apparent decrease of the translation and an over expression of several molecular chaperones. Telomestatin induces in particular an over expression of the protein BCL2A1 which is involved in drug resistance of cancer cells and a probable increase of the translation. Both treatments have a common effect particularly on the molecular chaperone CCT (down expression), HSP90 alpha (over expression) and hnRNP D (down expression). The protein HSP90 alpha is also over expressed in hTERT transfected cells compared to parental cells. This protein is already a promising anticancer target protein due to its central role in oncogenesis and in telomerase activity regulation. 1 Mazzucchelli et al: Proteome Science 6: 12, 2008. [less ▲]

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See detailFruit microstructure evaluation using synchrotron X-ray computed tomography
Verboven, Pieter; Kerckhofs, Greet ULg; Mebatsion, Hibru K. et al

Conference (2008)

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See detailHow compatible is perfect competition with transmission loss allocation methods?
Jing, Dai; Phulpin, Yannick; Rious, Vincent et al

in Proceedings of the 5th International Conference on the European Electricity Market (EEM-08) (2008)

This paper addresses the problem of transmission loss allocation in a power system where the generators, the demands and the system operator are independent. We suppose that the transmission losses are ... [more ▼]

This paper addresses the problem of transmission loss allocation in a power system where the generators, the demands and the system operator are independent. We suppose that the transmission losses are exclusively charged to the generators, which are willing to adopt a perfectly competitive behavior. In this context, their offers must reflect their production costs and their transmission loss costs, the latter being unknown beforehand and having to be predicted. We assume in this paper that the generators predict their loss costs from the past observations by using a weighted average of their past allocated costs. Under those assumptions, we simulate the market dynamics for different types of transmission loss allocation methods. The results show that the transmission loss allocation scheme can lead to a poorly efficient market in terms of social welfare. [less ▲]

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See detailFrom strokes to model: a bottom-up approach for sketching activities analysis. Workshop.
Safin, Stéphane ULg; Juchmes, Roland ULg; Elsen, Catherine ULg et al

Conference (2008)

This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe ... [more ▼]

This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe our previous works on sketch-based support tools for the preliminary design phases and the context of these researches. The next chapter declares the concrete objectives of our approach, then the methodology of sketches analysis we propose is presented with a concrete example, and finally the last section is dedicated to the expected results and specifications of a sketch-based support tool that would follow our framework. [less ▲]

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See detailNonlinear Normal Modes, Part I: An Attempt To Demystify Them
Kerschen, Gaëtan ULg; Peeters, Maxime ULg; Golinval, Jean-Claude ULg et al

in 26th International Modal Analysis Conference, Orlando, 2008 (2008)

The concept of nonlinear normal modes (NNMs) is discussed in the present paper and its companions, Parts II and III. Because there is virtually no application of the NNMs to large-scale engineering ... [more ▼]

The concept of nonlinear normal modes (NNMs) is discussed in the present paper and its companions, Parts II and III. Because there is virtually no application of the NNMs to large-scale engineering structures, these papers are an attempt to highlight several aspects that might drive their development in the future. Specifically, we support that (i) numerical methods for the continuation of periodic solutions pave the way for an effective and practical computation of NNMs, and (ii) time-frequency analysis is particularly suitable for the analysis of the resulting dynamics. Another objective of the present paper is to describe, in simple terms, and to illustrate the fundamental properties of NNMs. This is achieved to convince the structural dynamicist not necessarily acquainted with them that they are a useful framework for the analysis of nonlinear vibrating structures. [less ▲]

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See detailPurification of nuclear mRNPs, characterization of their content and function in transcription
Close, Pierre ULg; Skehel, M; East, P et al

Poster (2008)

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See detailNegative refraction: theory and application to thin metal layer superlens
Lecler, Sylvain; Frere, Benjamin; Habraken, Serge ULg et al

in Proceedings of SPIE (2008), 6987

The main concepts dealing with negative refraction are clarified in order to understand if a high conductive metal layer thinner than the wavelength can really be considered as a metamaterial with a ... [more ▼]

The main concepts dealing with negative refraction are clarified in order to understand if a high conductive metal layer thinner than the wavelength can really be considered as a metamaterial with a negative refraction index. The theoretical method to find the direction of phase velocity is clearly explained. The use of the causality principle is presented. We discuss why the negative refractive metamaterial has to be regarded as a dispersive one. Discussions are illustrated by means of FDTD simulations. The superlens application is presented. We explain why it is not obvious to consider a thin metal layer as a negative refractive material. [less ▲]

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See detailOn-the-go georeferenced measurements of soil mechanical strength and differenciation of soil structure.
Destain, Marie-France ULg; Sirjacobs, Damien ULg; Hanquet, Bernard et al

in Geophysical Research Abstracts (2008)

Soil strength is defined as the resistance which as to be overcome to obtain a given soil deformation. Amongst the numerous methods developed to measure soil strength, two are classically used. On one ... [more ▼]

Soil strength is defined as the resistance which as to be overcome to obtain a given soil deformation. Amongst the numerous methods developed to measure soil strength, two are classically used. On one hand, a laboratory method based on triaxial tests of undisturbed soil samples allows the estimation of cohesion and internal friction angle by the Mohr-Coulomb equation. On the other hand, measuring soil penetration resistance by pushing a cone into a soil is a widely used technique. Both techniques deliver discontinuous field information and are not suited to produce digital soil mapping. The objectives of this paper are to present a sensor able to continuously measure soil strength variations. The sensor was constituted of a thin blade pulled in the soil at a constant depth and speed and a beam which transferred the soil-blade forces to a transducer fixed on a vehicle. The transducer measures the draft force Fx, the vertical force Fz and the moment My thanks to an octagonal ring dynamometer. A measurement chain was developed to acquire simultaneously the signals provides by the soil strength sensor and those of a DGPS. Signal processing was notably based on geostatistics and allows soil mapping [1]. Four fields representative of the soils used in silty areas for arable production in Belgium were selected. The measurements were repeated several times during 1999-2003. Targeted test plots were chosen in each field to perform reference measurements, namely granulometry, cohesion, friction angle, pF, water content, dry bulk density, and cone index. The within-field studies revealed high variability caused by texture, history, traffic, etc., and showed a correlation between the sensor signals and physical parameters, such as cone index and soil moisture, as long as no over-consolidation of the soil occurred [2]. To assess the similarity of soil strength between the fields, the data Fx, Fz and My were classified by using canonical variates (CV). The two first CV represented 95.9 % of the variability, which means that two main variables contain the essential part of the information. In a plane (Fz, Fx), three clusters could be distinguished. The first one (trials 1 and 5), characterized by a low draft and a high Fz, corresponded to trials performed in March on soils ploughed during the winter, naked or covered with small vegetation, and characterized by small values of cone index. The second one (trials 2, 3, 4, 7) with high values of Fx and Fz grouped measurements done just after wheat harvest in August. The third cluster (trials 6) corresponded to measurements performed during wheat growth. It may be concluded that the signals from the sensor treated by suited statistical analysis have the potential to differentiate soil structures at a field scale. REFERENCES [1] Sirjacobs D., Hanquet B., Lebeau F., Destain M.-F. (2002). On-line mechanical resistance mapping and correlation with soil physical properties for precision agriculture. Soil and Tillage Research 64, 231-242. [2] Hanquet B., Sirjacobs D., Destain M.-F., Frankinet M., Verbrugge J.-C. (2004). Analysis of soil variability measured with a soil strength sensor. Precision Agriculture, 5, 227-246. [less ▲]

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See detailComparison of transrectal ultrasound and plasma pregnancy-associated glycoprotein (PAG) as pregnancy tests of reindeer
Savela, H.; Vahtiala, S.; Lindeberg, H. et al

in Proceedings of the 16th International Congress on Animal Reproduction (2008)

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See detailConsidering bottom curvature in depth-averaged open-channel flow modelling, based on curvilinear coordinates
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Pirotton, Michel ULg

in Advances in Fluid Mechanics VII (2008)

Accurately modelling open-channel flows on strongly vertically curved bottoms, such as for instance over a spillway, is a challenge for any depth-averaged flow model. This type of computation requires the ... [more ▼]

Accurately modelling open-channel flows on strongly vertically curved bottoms, such as for instance over a spillway, is a challenge for any depth-averaged flow model. This type of computation requires the use of axes properly inclined along the mean flow direction in the vertical plane and a modelling of curvature effects. The present generalized model performs such computations by means of curvilinear coordinates in the vertical plane, enabling for instance to simulate within one single computation domain the flows in the upstream reservoir, over the spillway, in the stilling basin and in the river reach downstream of a dam. The frame of reference is chosen in such a way that one of the two curvilinear axes follows the local bottom curvature. Hence the set of generalized shallow water equations involves explicitly not only the channel bottom slope, but also the channel vertical curvature and its derivative. The velocity profile is generalized in comparison with the uniform one usually assumed in the conventional shallow-water equations. The pressure distribution is also modified as a function of the bottom curvature and is thus not purely hydrostatic but accounts for effects of centrifugal forces. This enhanced mathematical modelling framework has been implemented in a 2D finite volume model. A specific flux vector splitting technique has been developed and demonstrated to be stable for any flow regime and any bottom curvature. The scheme offers the advantage of being dependent only on the sign of the bottom curvature. For a vanishing bottom curvature, the new model converges smoothly towards the conventional shallow-water equations. Finally, two test cases are detailed and lead to satisfactory validation results for the new model. [less ▲]

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See detailSecreted subtilisins of Microsporum canis are involved in adhesion of arthroconidia to feline corneocytes
Mathy, Anne ULg; Tabart, Jérémy; Mignon, Bernard ULg et al

Poster (2008)

Microsporum canis is a pathogenic fungus that causes a superficial skin infection called dermatophytosis mainly in cats, dogs and humans. Like other dermatophytoses, the physiopathology of this dermatosis ... [more ▼]

Microsporum canis is a pathogenic fungus that causes a superficial skin infection called dermatophytosis mainly in cats, dogs and humans. Like other dermatophytoses, the physiopathology of this dermatosis remains largely unknown. From a fungal perspective, the infection process can be divided in three steps: adhesion of M. canis arthroconidia to corneocytes, conidial germination, and fungal invasion of the keratin network. The mechanisms involved in adherence of M. canis to epidermis have never been investigated. However, several previously characterized secreted fungal endoproteases like subtilisins (Sub), including the keratinolytic protease Sub3, are secreted in vivo and could be involved in the first pathogenic steps. The objective of this study were (1) to develop an in vitro model to study M. canis adherence to feline corneocytes and (2) to assess whether the Sub are involved in fungal adhesion. An arthroconidial suspension was spread over the surface of reconstituted feline epidermis (RFE). Co-cultures were incubated for varying lengths of time and adherent conidia were labelled using Calcofluor white and counted. In subsequent assays arthroconidia were exposed to the serine protease inhibitor chymostatin or a mixture of two anti-Sub3 monoclonal antibodies (Mabs) one hour prior to the adherence assay. In our model, adherence of M. canis arthroconidia to RFE is time-dependent, beginning within two hours and still increasing after six hours. Chymostatin and Mabs inhibit M. canis adherence to RFE by 53 and 23 % respectively, which suggests that subtilisins and particularly Sub3, are fungal virulence factors involved in the adherence process. [less ▲]

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See detailDetailed 2D flow simulations as an onset for evaluating socio-economic impacts of floods
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Proceedings of the European Conference on Flood Risk Management - FloodRisk 2008 (2008)

A 2D hydraulic numerical model is presented. It is based on the fully dynamic shallow-water equations, solved by means of a finite volume scheme on multiblock structured grids. The model handles highly ... [more ▼]

A 2D hydraulic numerical model is presented. It is based on the fully dynamic shallow-water equations, solved by means of a finite volume scheme on multiblock structured grids. The model handles highly accurate DSM derived from airborne laser altimetry for the floodplains and sonar detection for the bathymetry of the main channel. The flow simulations are performed with a typical grid spacing of 2m, comparable to the resolution of the DSM and fine enough to represent reliably the flows at the scale of each building. Consequently, the model succeeds in predicting accurately the pattern of flood depth even in densely urbanized floodplains, as confirmed by several validation examples, which also demonstrate the ability of the model to reproduce depth measurements for a wide range of flood discharges without the need for recalibration of the roughness coefficient. Finally, the hydraulic model is exploited as a component of a complete flood risk modelling chain, accounting for socio-economic and ecological impacts of floods and dedicated to the assessment of flood protection measures in the context of climate change. [less ▲]

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See detailDevelopment of a technique to measure 17β-estradiol in discrete brain regions in zebra finch
Charlier, Thierry ULg; Po, Kelvin WL; Shah, Amit H et al

Poster (2008)

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See detailA mathematical model of bone regeneration including angiogenesis: relevance for tissue engineering strategies
Van Oosterwyck, Hans; Vander Sloten, Jos; Geris, Liesbet ULg

in European Cells and Materials (2008), Vol. 14(Suppl. 1,), 29

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See detailATRP of methyl methacrylate and styrene catalysed by homobimetallic ruthenium-vinylidene complexes
Bicchielli, Dario ULg; Borguet, Yannick ULg; Sauvage, Xavier ULg et al

in Polymer Preprints (2008)

Styrene and Me methacrylate were subjected to atom transfer radical polymn. using a homobimetallic ruthenium-vinylidene complex (p-cymene)RuCl2/(PCy3)(styrylidene)RuCl2 as catalyst and Et 2 ... [more ▼]

Styrene and Me methacrylate were subjected to atom transfer radical polymn. using a homobimetallic ruthenium-vinylidene complex (p-cymene)RuCl2/(PCy3)(styrylidene)RuCl2 as catalyst and Et 2-bromoisobutyrate (EBiB), 1-phenylethyl bromide, or CCl4 as initiators (in toluene). The polymns. proceeded in a controlled fashion and the polydispersities were quite narrow. Using (EBiB), an induction period was obsd. The polymn. of styrene ceased after 80% conversion because of the degrdn. of the complex into inactive species. With both monomers and CCl4 as initiator, the mol. wt. of the polymers was lower than the calcd. value, i.e., the initiation efficiency was >1. [less ▲]

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See detailMise au point d’une épreuve originale de quantification du statut fonctionnel du sujet fibromyalgique
Maquet, Didier ULg; Lehance, Cédric ULg; Mouette, Eric et al

in Revue du Rhumatisme (2008), 75

Objectif Mettre au point une épreuve de "monitoring" du statut fonctionnel du sujet fibromyalgique durant une période de 24 heures. Patients et Méthodes Vingt-six patientes fibromyalgiques, diagnostiquées ... [more ▼]

Objectif Mettre au point une épreuve de "monitoring" du statut fonctionnel du sujet fibromyalgique durant une période de 24 heures. Patients et Méthodes Vingt-six patientes fibromyalgiques, diagnostiquées selon les critères du Collège Américain de Rhumatologie et 21 sujets volontaires contrôles féminins sont inclus dans cette étude. La quantification du statut fonctionnel est réalisée à partir du « Sense Wear Pro® Armband » (basé sur un système d'accélérométrie et de capteurs thermiques) placé au niveau du bras des sujets contrôles et fibromylagiques durant 24 heures. Ce dispositif, particulièrement léger et porté en l'absence de toute gêne particulière, permet, à partir d'un logiciel, de calculer divers paramètres dont la dépense énergétique totale (Kcal), le nombre de pas, le temps en position allongée, le temps de sommeil, la dépense énergétique réalisée à différents niveaux d'intensité d'activité physique (0 à 1 équivalent métabolique (MET), 2 à 3 MET, > à 3 ou 4 MET, … ). Résultats Au terme de cette épreuve originale de monitoring de statut fonctionnel durant 24 heures, nous observons une modification significative du statut fonctionnel de la population fibromyalgique en comparaison de la population contrôle, appariée en termes de paramètres biométriques. La dépense énergétique (Kcal) mesurée à une intensité comprise entre 1 et 2 MET, 3 et 4 MET ou encore à une intensité supérieure à 4 MET apparaît significativement réduite chez les patients fibromyalgiques. Par contre, aucune différence significative ne s'observe pour la dépense énergétique comprise entre 0 et 1 MET, le temps mesuré en position allongée et le temps de sommeil. Enfin, le nombre de pas accomplis sur 24 heures diffère significativement entre les 2 groupes (7776 pas chez les fibromyalgiques versus 11068 pas chez les sujets contrôles). Discussion Ces observations originales illustrent non seulement l'altération du statut fonctionnel du fibromyalgique mais aussi un certain ralentissement fonctionnel puisque aucune différence ne s'observe pour la dépense énergétique mesurée entre 0 et 1 MET alors qu'au-delà, les différences apparaissent significatives. Conclusion Cette étude propose une épreuve particulièrement sensible de monitoring du statut fonctionnel du sujet fibromyalgique. Ce test, ne sollicitant aucune participation volontaire du patient, pourrait constituer une épreuve de choix dans la quantification de statut fonctionnel du fibromyalgique, notamment dans le cadre du suivi longitudinal du patient ou encore la quantification des bénéfices éventuels apportés par diverses thérapeutiques. L'épreuve apparaît, en outre, transférable à de multiples situations pathologiques. [less ▲]

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See detailRelationship between lactoferrin, minerals, and somatic cells in bovine milk
Soyeurt, Hélène ULg; Arnould, Valérie ULg; Bruwier, Damien et al

in Journal of Dairy Science (2008), 91(E-Suppl. 1), 542

Selection for increased mastitis resistance is hampered by lack of available data. Currently, somatic cell count or score are proven indicators. However, it should be a priority to increase the number of ... [more ▼]

Selection for increased mastitis resistance is hampered by lack of available data. Currently, somatic cell count or score are proven indicators. However, it should be a priority to increase the number of available indicator traits for mastitis resistance. The aim of this research was to study the relationships among potential indicator traits as lactoferrin content, concentrations of major minerals in milk (calcium, Ca; sodium, Na; phosphore, P), and somatic cell count. First, 3 calibration equations Breeding and Genetics: Breeding for Milk Quality and Test-Day Model Applications J. Anim. Sci. Vol. 86, E-Suppl. 2/J. Dairy Sci. Vol. 91, E-Suppl. 1 543 were developed using partial least squares regressions to predict the contents of Ca, Na, and P in milk by mid-infrared spectrometry. A total of 1,609 milk samples were collected between March 2005 and May 2006 for 475 cows from 6 dairy breeds. Based on their spectral variability, 100 samples were selected using a principal components approach. The contents of these minerals were estimated by emission spectrometry (ICP-AES). The ratio of standard deviation to standard error of cross validation obtained for the equations predicted the contents of Ca, Na, and P were superior to 2 suggesting the use of these equations in this research. Second, the relationship between lactoferrin, minerals and somatic cells was studied using a random regressions multi-trait animal test-day model. A total of 57,973 milk samples were collected from 94 herds between April 2005 and January 2008 during milk recording in the Walloon part of Belgium. [less ▲]

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See detailIntegrated assessment of flood protection measures in the context of climate change: hydraulic modelling and economic approach
Dewals, Benjamin ULg; Giron, Eve; Ernst, Julien ULg et al

in Aravossis, K.; Brebbia, C. A.; Gomez, Nieves (Eds.) Environmental Economics (2008)

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See detailTheoretical Understanding of Targeted Energy Transfers for Suppressing Aeroelastic Instabilities in a Nonlinear Aeroelastic Test Apparatus
Lee, Young S.; McFarland, D. Michael; Kerschen, Gaëtan ULg et al

in 45th Technical Meeting of the Society of Engineering Science, Urbana Champaign, 2008 (2008)

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See detailComputation of Nonlinear Normal Modes using Numerical Continuation Techniques
Peeters, Maxime ULg; Viguié, Régis ULg; Serandour, Guillaume et al

in International Confernce on Advanced Computational Methods in Engineering, Liège, 2008 (2008)

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See detailSecond sound and shock waves in rigid crystals: an extended thermodynamic analysis
Lebon, Georgy ULg; Dauby, Pierre ULg; Desaive, Thomas ULg et al

in Proceedings of CHT-08 ICHMT International Symposium on Advances in Computational Heat Transfer (2008)

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See detailIntegration of accurate 2D inundation modelling, vector land use database and economic damage evaluation
Ernst, Julien ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of the European Conference on Flood Risk Management - FloodRisk 2008 (2008)

Within the global framework of the climate change, according to most Regional Climate Mod-els the maximum peak discharges in river will increase in importance and frequency. Therefore the people will have ... [more ▼]

Within the global framework of the climate change, according to most Regional Climate Mod-els the maximum peak discharges in river will increase in importance and frequency. Therefore the people will have to face worst inundation conditions. In order to protect themselves from the increasing flood risk, the communities have to draw up suitable flood protection measures. The selection and the evaluation among the different possible flood mitigation measures requires developing decision-support system (DSS). This sys-tem has to take into consideration parameters such as hydraulic, economic, social or environmental. This pa-per focuses on the integration between two components of the DSS, namely the evaluation of the economic impacts of floods and the hydrodynamic modelling. The hydraulic simulations are conducted by means of WOLF 2D flow modelling system and provide as an output high resolution flood maps detailing the distribu-tion of water depth and flow velocity in the floodplains. The integration is ensured by the use of very accurate geographic databases and an automated procedure which makes the most of geomatic methods. The paper de-tails the application of the integrated assessment procedure for a case study along the river Ourthe located in the Meuse basin (Belgium). Moreover, possibilities of validation of the economic damage evaluation proce-dure are investigated by comparing computation results with real damage data recorded by the Belgian Disas-ter Fund after several major flood events (2003, 2002, 1995, and 1993). [less ▲]

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See detailContribution de l’inactivation épigénétique des gènes BRCA1 et BRCA2 dans les cancers du sein sporadiques en Tunisie
Trimeche, Mounir; Ziadi, Sonia; Hachana, Mohamed Ridha ULg et al

in Bulletin du Cancer (2008)

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See detailExploiting tree-based variable importances to selectively identify relevant variables
Huynh-Thu, Vân Anh; Wehenkel, Louis ULg; Geurts, Pierre ULg

in Proc. of FSDM08, ECML/PKDD Workshop on New challenges for feature selection in data mining and knowledge discovery (2008)

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See detailLe collage des restaurations all ceram
MAINJOT, Amélie ULg

Conference (2008)

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See detailIdentification of the Slow-Flow Dynamics of Transonic Aeroelastic Response from Time-Series Data
Lee, Y. S.; Vakakis, Alexander F.; McFarland, D. M. et al

in 45th Technical Meeting of the Society of Engineering Science, Urbana Champaign, 2008 (2008)

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See detailCross-entropy based rare-event simulation for the identification of dangerous events in power systems
Belmudes, Florence ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

in Proceedings of the 10th International Conference on Probabilistic Methods Applied to Power Systems (PMAPS-08) (2008)

We propose in this paper a novel approach for identifying rare events that may endanger power system integrity. This approach is inspired by the rare-event simulation literature and, in particular, by the ... [more ▼]

We propose in this paper a novel approach for identifying rare events that may endanger power system integrity. This approach is inspired by the rare-event simulation literature and, in particular, by the cross-entropy (CE) method for rare event simulation. We propose a general framework for exploiting the CE method in the context of power system reliability evaluation, when a severity function defined on the set of possible events is available. The approach is illustrated on the IEEE 30 bus test system when instability mechanisms related to static voltage security are considered. [less ▲]

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See detailAdvantages and limits of a video multitracking system for quantification of individual behavior in a large fish shoal
Delcourt, Johann ULg; Becco, Christophe ULg; Vandewalle, Nicolas ULg et al

in Spink, A.; Ballintijn, M. R.; Bogers, N. D. (Eds.) et al Proceedings of Measuring Behavior 2008 (2008)

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See detailE. coli HU dimers dynamics studied by NMR
Augustyniak, R.; Damblon, Christian ULg; Castaing, B.

Poster (2008)

HU is a 2x90 residues, dimeric bacterial histone-like protein involved in chromosome compaction and other DNA-related processes. E. coli HU proteins are composed of three forms: two homodimers α2 and β2 ... [more ▼]

HU is a 2x90 residues, dimeric bacterial histone-like protein involved in chromosome compaction and other DNA-related processes. E. coli HU proteins are composed of three forms: two homodimers α2 and β2 (α and β sharing 70% of sequence identity) and one heterodimer (αβ). Dimeric forms relative abundance varies during cell growth and in response to environmental changes, suggesting that each dimer plays different physiological roles. Unlike other HU proteins which melt through a single step (N2<=>2D), E. coli dimers melt according to a two-step mechanism (N2<=>I2<=>2D). The native dimer, N2, melts partially into a dimeric intermediate, I2, which in turn yields the unfolded monomers, D. Circular Dichroism studies indicate that the intermediate, I2, corresponds to an HU dimer having partly lost its a-helices. Here we compared dynamic properties and structural features of E. Coli HU dimers at different temperatures in order to determine the secondary strutural elements still present in the I2 intermediate. Isotopically labelled proteins (15N, 13C) have been used to perform backbone assignment for all dimeric forms using sequential triple-resonance experiments. 15N-HSQC at different temperatures (288-323K) were recorded .Intensity variations and chemical shift perturbations allow the identification of the secondary element lost in the intermediate I2 confirming the high dynamics of arms responsible for protein-DNA interactions and the thermal stability of HTH motif in all dimeric forms. [less ▲]

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See detailImprovements of image processing for wheat ear counting
Cointault, Frédéric; Journaux, Ludovic; Miteran, Joel et al

in Agricultural and biosystems engineering for a sustainable world (2008)

One of the most important activity of agricultural research insititutes concerns the agronomical experiments done under different conditions needing many land observations and valuations to quantify ... [more ▼]

One of the most important activity of agricultural research insititutes concerns the agronomical experiments done under different conditions needing many land observations and valuations to quantify several variables. These observations, although generally accurate, are visually done by the agriculturist technicians and present numerous drawbacks: penibility, weak productivity, numerous labor force, limited sampling … Two feasibility studies lead in our laboratory recently have shown that some of the previous observations, and particularly the counting of the number of wheat ear per m², can be done by color and/or texture image processing for images taken directly in the field with a specific acquisition system. This paper describes the improvements of the previous studies concerning the image acquisition system, and especially the illumination control, and the justification of different hypothesis on the number of classes to detect in an image. The use of a cluster validity index has allowed to prove that 3 classes to determine all the objects in a wheat ear image are not sufficient. A correlation with a study based on the size of the analysis window is currently under investigation to improve the ear detection, which is now of 6%, compared to manual counting done by agriculturist technicians. [less ▲]

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See detailDetection of glucocorticoid bioactivity in bovine urine samples using a reporter gene assay
Connolly, Lisa; Kai, C.; Van Der Heiden, Edwige ULg et al

in Proceedings of the Euroresidue VI Conference (2008)

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See detailInvestigation of the geomechanical aspects of a large landslide by means of a finite-element method: a case study
François, Bertrand ULg; Bonnard, Christophe; Laloui, Lyesse

in 12th IACMAG Conference (2008)

Using advanced geomechanical finite element modelling, it has been possible to simulate the mechanical behaviour of a large slope movement, namely the Triesenberg landslide. This slope is located along ... [more ▼]

Using advanced geomechanical finite element modelling, it has been possible to simulate the mechanical behaviour of a large slope movement, namely the Triesenberg landslide. This slope is located along the Rhine valley in the Principality of Liechtenstein, covering an area of around 5 km2 which includes two villages. Pore water pressure fields calculated by a separated hydrogeological model were used as an input for the geomechanical model. The results obtained through 2- and 3-dimension numerical simulations agree fairly well with field measurements of peak velocity, spatial and temporal distribution of velocity and total displacements. Such results were obtained using a Modified Cam-Clay elasto-plastic constitutive model. In addition, a parametric study has been carried out to evaluate the effect of the selected friction angle and of the range of water pressure variation on the movements during a crisis period. [less ▲]

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See detailIsokinetic fatigue protocol: Assessment of shoulder rotator muscles
Forthomme; Maquet, Didier ULg; Lehance, Cédric ULg et al

in Abstract book of 13th Annual Congress of the European College of Sport Science (2008)

Detailed reference viewed: 71 (10 ULg)