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See detailA comparison of triangle and quadrangle finite elements for large strain elastoplastic formulations
KARASEVA, Olga; Stainier, Laurent ULg; Careglio, C. et al

in Proceedings of ACOMEN’2008, Advanced Computational Methods in Engineering (2008)

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems ... [more ▼]

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems, in particular necking of a cylindrical bar in tension. Stress distribution at necking section, as well as load histories are analyzed for all three formulations. Two other test cases consider bending of the so-called ”Greco” beam and upsetting of a cylinder. Numerical results show that all approaches yield very similar results and thus are equally valid. Furthermore, quadratic 6-noded triangles provide a good alternative to bilinear quadrangles, even if sometimes they appear to be more sensitive to big distorsions. [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 detailOlive mill wastewater valorization : use by non-conventional yeasts.
Gonçalves, C.; Lopes, M.; Aguedo, Mario ULg et al

in Nzihou, Ange; Lyberatos, Gerasimos (Eds.) Proceedings of the 2nd International Conference on Engineering for Waste Valorisation (2008)

The ability of the strains Yarrowia lipolytica and Candida rugosa to grow on Olive Mill Wastewater (OMW) based medium and to produce high-value compounds from OMW (such as enzymes), while degrading this ... [more ▼]

The ability of the strains Yarrowia lipolytica and Candida rugosa to grow on Olive Mill Wastewater (OMW) based medium and to produce high-value compounds from OMW (such as enzymes), while degrading this waste, was tested. Factors affecting cellular growth and OMW degradation were also studied, such as OMW composition, dilution and supplementation. OMW collected from 3-phase olive mill of the north region of Portugal were used and characterized chemical and biochemically. OMW with COD ranging from 100 g·L-1 to 200 g·L-1 were supplemented with yeast extract and ammonium chloride proportionally to its organic composition. Preliminary studies of OMW consumption were carried out in batch cultures of Y. lipolytica W29 and C. rugosa PYCC 3238. The strains were able to grow in the OMW used without dilution, to consume almost all of the sugars present in the media and to significantly reduce COD. Y. lipolytica W29 was less affected by operating conditions changes such as, stirring rate variation and OMW medium supplementation. [less ▲]

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See detailFamille, sexualité et pouvoir dans "L’Ogre" de Jacques Chessex et "Le Jardin d’acclimatation" d’Yves Navarre
Sindaco, Sarah ULg

in Bouliane, Claudia; Popovic, Pierre (Eds.) La Ve République des Goncourt (2008)

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See detailThe Effects of Early Retirement on Youth Unemployment: The Case of Belgium
Jousten, Alain ULg

Conference (2008)

The paper studies the effect of the pension system on the unemployment of the young

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See detailLe champ d'application de la loi Breyne
Kohl, Benoît ULg

Conference (2008)

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See detailEtude du matériel céramique d’un dépotoir mérovingien en province de Namur (Belgique)
Van Wersch, Line ULg; Vrielynck, olivier

in Guillaume, J.; Peytremann, E. (Eds.) L’Austrasie, société, économies, territoires, christianisation, Actes des XXVIe Journées internationales d’archéologie mérovingienne (2008)

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See detailThe IMA-CNMNC dominant-constituent rule revisited and extended
Hatert, Frédéric ULg; Burke, Ernst

Conference (2008)

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See detailL'impact de l'ouverture à la concurrence
Pauliat, Hélène; Burnham, June; Galabov, Anthony et al

in Pauliat, Hélène (Ed.) Services publics, concurrence, régulation : le grand bouleversement en Europe ? (2008)

Mon intervention lors de ce panel porte principalement sur la libéralisation du secteur du placement des demandeurs d'emploi et du secteur de l'énergie.

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See detailAxions and polarisation of quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in AIP Conference Proceedings (2008), 1038

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent ... [more ▼]

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent orientations of quasar polarisation vectors in visible light that have been observed in some regions of the sky. [less ▲]

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See detailLevels of PCDD/Fs and DL-PCBs in Belgian river eel specimen
Focant, Jean-François ULg; Geererts, C.; Eppe, Gauthier ULg et al

in Organohalogen Compounds (2008), 70

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See detailPraktijkgerelateerd contrastief onderzoek naar vreemdetaalverwerving
Hiligsmann, Philippe; Baelen, Mélanie; Leloup, Anne-Lore et al

Conference (2008)

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See detailNonlinear Normal Modes, Part II: Practical Computation using Numerical Continuation Techniques
Peeters, Maxime ULg; Viguié, Régis ULg; Sérandour, Guillaume 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 companion, Part I. One reason of the still limited use of NNMs in structural dynamics is that their computation is ... [more ▼]

The concept of nonlinear normal modes (NNMs) is discussed in the present paper and its companion, Part I. One reason of the still limited use of NNMs in structural dynamics is that their computation is often regarded as impractical. However, when resorting to numerical algorithms, we show that the NNM computation is possible with limited implementation effort, which paves the way to a practical method for determining the NNMs of nonlinear mechanical systems. The proposed algorithm relies on two main techniques, namely a shooting procedure and a method for the continuation of NNM motions. The algorithm is demonstrated using two different mechanical systems, a nonlinear two-degree-of-freedom system and a nonlinear cantilever beam discretized by the finite element method. [less ▲]

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See detailA Numerical Simulator for VITRUV
Lebouquin, J.-B.; Herwats, Emilie ULg; Carvalho, M.-I. et al

in Richichi, A.; Delplancke, F.; Paresce, F. (Eds.) et al The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation (2008)

VITRUVsim is a numerical tool with as much as possible physics included. Inputs are the source parameters (flux, morphology, position...) and outputs are sequences of observed fringes and/or reduced ... [more ▼]

VITRUVsim is a numerical tool with as much as possible physics included. Inputs are the source parameters (flux, morphology, position...) and outputs are sequences of observed fringes and/or reduced visibilities. VITRUVsim is written in a portable and free language. [less ▲]

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See detailEffects of fish size on agonistic sounds in the clownfish Amphiprion akallopisos : implications for the role of the swimbladder in the sound production mechanism?
Colleye, Orphal ULg; Vandewalle, Pierre ULg; Frederich, Bruno ULg et al

Conference (2008)

Clownfishes (i.e. Amphiprion akallopisos) are territorial fishes that use sound production to defend their anemone territory. They live in social groups which display a size-based dominance hierarchy. In ... [more ▼]

Clownfishes (i.e. Amphiprion akallopisos) are territorial fishes that use sound production to defend their anemone territory. They live in social groups which display a size-based dominance hierarchy. In such a system, agonistic interactions are frequent and play an important role in the social organization. In addition, these interactions are often associated with sounds. In this study, we compared the sonic features between individuals of different sizes and in different sexual status (juvenile, male and female). The existent relationship between fish size and swimbladder size also implied to seek the swimbladder role in the sound production. Sound analyses showed that juveniles, males and females had distinct sounds in the dominant frequency and pulse duration. These differences were however not in relation to the sexual state; influence of sex on sonic features being mainly the result of a size dimorphism between sexes. Differences in calls were therefore due to the respective size of the emitter. This observation highlighted the role of the swimbladder as a resonance chamber. This role was also reinforced because the experimental filling of the swimbladder with physiological liquid significantly modified the acoustic features. In A. akallopisos, frequency and pulse duration are directly related to swimbladder size, and thus to fish size. This relationship provides strong evidence that the emitter could be identified by its calls. [less ▲]

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See detailA Multi-Wavelength Simultaneous Study of the Composition of the Halley-Family Comet 8P/Tuttle at the VLT
Bockelée-Morvan, Dominique; Dello Russo, N.; Jehin, Emmanuel ULg et al

in LPI contribution 1405 (2008)

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See detailPhysical and numerical modeling of overbank flow with a groyne on the floodplain
Peltier, Yann ULg; Proust, S.; Bourdat, A. et al

in River Flow 2008: 4th Int. Conf. on Fluvial Hydraulics (2008)

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See detailDifferential diagnosis of equine systolic murmurs
Amory, Hélène ULg

in In the Proceedings of the Voorjaardagen Congress (2008)

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See detailUsing monovariate and multivariate EOFs to reconstruct missing data with DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Sirjacobs, Damien ULg et al

Conference (2008)

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based method to reconstruct missing data in geophysical data sets. DINEOF can be used to reconstruct monovariate data sets (as sea ... [more ▼]

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based method to reconstruct missing data in geophysical data sets. DINEOF can be used to reconstruct monovariate data sets (as sea surface temperature (SST), chlorophyll, etc), and multivariate data sets with little increase in complexity. For multivariate reconstructions, extended EOFs are used, which take into account the interrelationships between related variables to infer data at missing locations. Spatial maps of the standard deviation of the reconstruction error can be also calculated. In the past, DINEOF has been compared to Optimal Interpolation (OI) techniques for the Adriatic Sea SST. The results showed that DINEOF was faster than OI, making it very suitable for operational applications. DINEOF was also more accurate when compared to in situ data. Another advantage of DINEOF is that there is no need for a priori knowledge of the statistics of the reconstructed data set (such as covariance or correlation length), thus reducing the subjectivity of the analysis. DINEOF has been successfully used to reconstruct a large variety of domains over the world ocean, mostly at the regional scale. In addition to an overview of the technique's capabilities, limitations and future developments, recent work aimed to improve the quality of the reconstructions at the global and local scales will be presented. [less ▲]

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See detailRadiative data in the Zr I spectrum obtained by Laser Induced Fluorescence
Malcheva, G.; Mayo, R.; Ortiz, M. et al

Conference (2008)

Radiative lifetimes of 17 excited states in Zr I, in the energy interval 29000 – 40974 cm-1, have been investigated using the Time-Resolved Laser-Induced Fluorescence (TR-LIF) method. The levels belong to ... [more ▼]

Radiative lifetimes of 17 excited states in Zr I, in the energy interval 29000 – 40974 cm-1, have been investigated using the Time-Resolved Laser-Induced Fluorescence (TR-LIF) method. The levels belong to the 4d25s5p, 4d35p and 4d5s25p electronic configurations were excited in a single - step process from levels belonging to the ground 4p25s2 a 3F or to low-lying 4p25s2 a 3P, a 5F terms. For 14 levels, the lifetimes have been measured for the first time. Experimental results are compared with theoretical calculations performed with a multiconfigurational relativistic Hartree–Fock method including core polarization effects. [less ▲]

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See detailOptimisation of blocked designs in fMRI studies
Maus, Bärbel ULg; van Breukelen, G. J. P.; Goebel, R. et al

Poster (2008)

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See detailComparison of Adaptive Filtering Schemes for Gas Turbine Performance Diagnostics
Borguet, Sébastien ULg; Léonard, Olivier ULg

in Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

Kalman filters are widely used in the turbine engine community for health monitoring purpose. This algorithm has proven its capability to track gradual deterioration with a good accuracy. On the other ... [more ▼]

Kalman filters are widely used in the turbine engine community for health monitoring purpose. This algorithm has proven its capability to track gradual deterioration with a good accuracy. On the other hand, its response to rapid deterioration is either a long delay in recognising the fault, and/or a spread of the estimated fault on several components. The main reason of this deficiency lies in the transition model of the parameters that assumes a smooth evolution of the engine condition. The aim of this contribution is to compare two adaptive diagnosis tools that combine a Kalman filter and a secondary system that monitors the residuals. This auxiliary component implements on one hand a covariance matching scheme and on the other hand a generalised likelihood ratio test to improve the behaviour of the diagnosis tool with respect to abrupt faults. [less ▲]

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See detailHydraulic behaviour of greened porous pavements: a physical study
Straet, Frederic; Beckers, Eléonore ULg; Degre, Aurore ULg

(2008)

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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 detailContribution of ATP-gated P2X1 ion channels to the control of neutrophil chemotaxis.
Lecut, Christelle ULg; Frederix, Kim ULg; Johnson, Daniel et al

in Purinergic Signalling (2008), 4

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See detailAryl Hydrocarbon receptor interacting protein (AIP) expression in human pituitary adenomas
Jaffrain-Rea, M. L.; Spilioti, C.; Vanbellinghen, Jean-François ULg et al

in 10th European Congress of Endocrinology - Abstract book (2008)

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See detailApplication of forensic science technique to the management of an endangered horse population
Bömcke, Elisabeth ULg; Gengler, Nicolas ULg

in Journal of Animal Science (2008), 86(E-suppl.2), 433

Implementing conservation strategies needs the knowledge of relationships inside the concerned population. The aim of the study was to find tools to help breeders to manage their horse population. The ... [more ▼]

Implementing conservation strategies needs the knowledge of relationships inside the concerned population. The aim of the study was to find tools to help breeders to manage their horse population. The Skyros pony is an indigenous Greek breed. The breed risk status is defined as critical-maintained according to the criteria from the Food and Agriculture Organization. Partial pedigree information is available, but its quality is poor as the average number of generation-equivalents is under 0.8 for the first known generation and under 1.4 for the second to the fifth. Further, 99 living individuals were genotyped at 16 microsatellite loci in order to check the registered parentage. For ungenotyped animals, conditional expectation of gene contents was calculated given molecular and pedigree data. As said in other studies, the animal genetics literature often seems unaware of relevant developments in human genetics (and conversely). In this study, an approach called Familial Searching was tested. This is used in forensic science, in addition to matching DNA evidence directly to criminal profiles, to search for people (present in a database) who are related to an individual that left DNA evidence at a scene of crime. This method is based on the calculation of likelihood ratios (LR) between genotype of an individual and genotypes of each other individuals of the database. The pedigree was used as ‘local’ prior information, i.e. relating to specific pairs of individuals. General knowledge about the studied population (generation interval, sexual maturity, …) was considered as ‘global’ prior information. Including prior information reduced the number of comparisons from over 50%. First results showed that the parents were always classified into the 5 highest LR. These results simplified parentage verifications, it allowed the detection of 90% of false parentage (LR=0). New links were created in the pedigree through detection of unregistered parents, what involved a reduction of the percentage of animals with one or both unknown parents and consequently an increase of the number of generation-equivalents. The pedigree of the breed was thus improved. [less ▲]

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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 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 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 detailThe influence of friction on elasto-plastic material in nanoindentation
Guo, Weichao ULg; Ponthot, Jean-Philippe ULg; ZHANG, W. H. et al

in Proceedings of ACOMEN’2008, Advanced Computational Methods in Engineering (2008)

A comprehensive computational study is undertaken to identify the influence of friction in nanoindentation of elasto-plastic materials, the impacts of friction on calculation results with conical and ... [more ▼]

A comprehensive computational study is undertaken to identify the influence of friction in nanoindentation of elasto-plastic materials, the impacts of friction on calculation results with conical and spherical indenters are shown in this paper. The results clearly demonstrate that, for some elasto-plastic materials, the P  h curves obtained either by spherical or conical indenters with different friction coefficients cannot be distinguished. However, if utilizing the parameter  (see text for details), to quantify the deformation of piling-up or sinking-in, it is easy to find that the influence of friction on piling-up or sinking-in in nanoindentation is significant. Therefore, the material parameters derived from the projected area will have a large error caused by the influence of friction. In this paper, the maximum error on hardness can reach 14% for some elastic materials. These results do not agree with those from researchers who stated that instrumented indentation experiments are not significantly affected by friction. Moreover, in conical indentation, friction can effectively restrain the slip on the interface between indenter and specimen, which leads to a decrease in the amount of piling-up or increase in the amount of sinking-in. However, when the half apex angle is large enough, the influence of friction becomes a minor factor in indentation. In spherical indentation, the amount of piling-up decreases or of sinking-in increases with an increasing friction coefficient. But the friction is independent of the radius of spherical indenter, the piling-up or sinking-in obtained by two different spherical indenters with varying friction coefficients are nearly identical. [less ▲]

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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 detailInfluence of the media granular size of small pilot subsurface flow wetlands on axial dispersion and the hydraulic behaviour
Fonder, N.; Xanthoulis, Dimitri ULg

in Wetlands Systems for Water Pollution Control. (2008)

The objective of this paper is to evaluate using tracer tests, the role of the granular media size on the hydraulic behaviour of small -scale pilot horizontal subsurface flow (HSSF) gravel beds. The non ... [more ▼]

The objective of this paper is to evaluate using tracer tests, the role of the granular media size on the hydraulic behaviour of small -scale pilot horizontal subsurface flow (HSSF) gravel beds. The non-ideal flow was modelled by the tank-in-series model (TIS) using the moment analysis and Gamma distribution fitting using the Solver™ routine in Microsoft Excel™; the Plug Flow with Dispersion (PFD) model was also assessed. Tests were performed under a greenhouse in four identical pilot-scale gravel beds of 9:1:1 ratio, which received an equal, inflow of clear water. The influent flow rate was 40 L/day and the surface area of the pilot cells was 0.8 m². The pea gravel media used in the four beds were as follows: 3-5 mm, 6-8 mm, 8-10 mm and 10-12 mm. The tracer used was Potassium Bromide (KBr) with a concentration of 1 g Br/L, using a single-shot injection into the inlet distribution tubes. Tests were repeated three times, with identical materials and methods. Statistical differences were observed between replications. Water loss by evaporation of the unplanted gravel beds was of 11% for the smaller media size (3-5 mm) which is significantly different than the 4 to 5% obtained for the other media sizes. Tracer detention time, tracer peak time, volumetric and hydraulic efficiencies show all the same tendency which is a significant reduction with larger particles sizes. The two methods of calculation for the number NTIS by moment analysis and Gamma distribution fitting (using Solver™) are significantly different. The Gamma model increases the number of TIS with significantly higher values for smaller media sizes. [less ▲]

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

in World scientific (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 detailHistology and ultrastructure of the elastic spring apparatus in Acanthodoras cataphractus (Siluriformes: Doradidae)
Fabri, Grégory; Thiry, Marc ULg; Parmentier, Eric

Poster (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 detailPoultry products market : Food safety and international trade
Duquesne, Brigitte ULg

Conference (2008)

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See detailThe role of scalar mesons in extended perturbation scheme for effective field theory
Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander; Vereshagin, Vladimir

in AIP Conference Proceedings (2008), 1030

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See detailSea-level changes and brachiopods and coral extinctions during the late Frasnian in the Namur-Dinant Basin (Belgium)
Mottequin, Bernard ULg; Poty, Edouard ULg

in Kröger, B.; Servais, T. (Eds.) Palaeozoic climates (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 detailBiodiversité et caractéristiques physiques des cours d'eau
Philippart, Jean-Claude ULg

in Lambot, Françis; et collaborateurs (Eds.) Actes du Colloque de Namur "La gestion physique des cours d'eau: bilan d'une décennie d'ingénierie écologique" (2008)

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See detailArchaeometry at the Centre Européen d’Archéométrie-Université de Liège
Calvo Del Castillo, Helena ULg; Mathis, François ULg; Garcia Moreno, Renata et al

Conference (2008)

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See detailMEMS Modelling using Non-Conforming Elements
Rochus, Véronique ULg; Rixen, Daniel; Golinval, Jean-Claude ULg

(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 detailMR imaging of the equine foot: a qualitative comparison of ex-vivo images at 0.27T, 1.5T and 3T
Bolen, Géraldine ULg; Audigié, F.; Spriet, M. et al

in Proceedings EVDI 2008 (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 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 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 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 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 detailReDrop – An Efficient Monte-Carlo Method for Simulating Extraction Columns
Kalem, Murat; Pfennig, Andreas ULg

Conference (2008)

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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 detailHigh-Frequency Integral Equation Solver for 3-D Wave Scattering Around Convex Obstacles
Geuzaine, Christophe ULg; Bruno, Oscar; V Sabariego, Ruth ULg et al

in Proceedings of 6ème Conférence Européenne sur les Méthodes Numériques en Electromagnétisme (NUMELEC2008) (2008)

We present a numerical method for the computation of wave scattering by convex three-dimensional obstacles, which exhibits a bounded computational complexity for arbitrarily high frequencies. The method ... [more ▼]

We present a numerical method for the computation of wave scattering by convex three-dimensional obstacles, which exhibits a bounded computational complexity for arbitrarily high frequencies. The method is based on a combination of a high-frequency ansatz for the unknown density in a boundary integral formulation of the problem, and an extension of the ideas of the method of stationary phase to allow for the efficient integration of oscillatory functions. The method builds upon the ideas proposed in [2] and [1]. [less ▲]

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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 detailPolymorphism in PERIOD3 predicts fMRI-assessed inter-individual differences in the effects of sleep deprivation
Vandewalle, Gilles ULg; Archer, Simon; Wuillaume, Catherine et al

in Journal of Sleep Research (2008), 17(Suppl. 1),

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See detailImprovement of He ion induced SiGe layer relaxation by a thin Si:C layer
Buca, D.; Trinkaus, H.; Holländer, B. 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 detailComparison of ultrasonography and MRI in the evaluation of palmar foot pain
Van Thielen, B.; Murray, R.; De Ridder, F. et al

in ESVOT Proceedings (2008)

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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 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 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 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 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 detailShear strength of unsaturated soil and its influence on slope stability
Tomboy, Olivier; Whenham, Valérie; De Vos, Monika et al

in 1st European Conference on Unsaturated Soils (2008)

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See detailCan laboratory tests help to define the profile of desensitised patients or patients at high risk of severe reaction ?
Gadisseur, Romy ULg; Collard, Ludivine; Cataldo, Didier ULg et al

in Allergy (2008), 63(Suppl. 88), 1773

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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 detailHolocene sediment deposition in contrasting Belgian catchments
Notebaert, Batsiaan; Houbrechts, Geoffrey ULg; Verstraeten, Gert et al

in LUCIFS Workshop December 2008: Programme and Abstracts (2008)

Holocene alluvial sediment deposition was studied in several contrasting Belgian catchments: the Geul (380 km2) and its tributary the Gulp (47 km2), the Amblève (1070 km2) and its tributary the Lienne ... [more ▼]

Holocene alluvial sediment deposition was studied in several contrasting Belgian catchments: the Geul (380 km2) and its tributary the Gulp (47 km2), the Amblève (1070 km2) and its tributary the Lienne (148 km²), and the Dijle (750 km2). These catchments have a comparable Holocene climatic evolution, but they differ largely in land use history. Detailed total Holocene sediments deposition was assessed for each catchment using more then 1000 hand augerings. Detailed radiocarbon dating of fluvial deposits was performed in the Dijle catchment, while iron slag was used as a tracer for sediments deposited after 1350 AD in the Lienne catchment. For the Geul River the presence of lead contamination, originating from 19th century mining activities, were used as a tracer. Results show that sediment deposition is much largest in the Dijle catchment (4.6 Mg/ha catchment area) then in the Gulp catchment (1.3 Mg/ha catchment area), while the lowest deposition is found in the Amblève catchment (0.2 Mg/ha catchment area). It is clear that these differences are mainly due to historical land use differences, although it can not be excluded that part of these differences are due to physical factors, especially for the Amblève catchment. For the latter catchment, the distribution of iron slags in the floodplain sediments showed that large parts of the alluvial plane were eroded after 1350 AD, and thus that there is no net aggradation as for the Dijle and Gulp floodplain. Remobilization of floodplain sediment in the Amblève makes it also difficult to estimate Holocene erosion rates. Nevertheless it is clear that an important part of the sedimentation took place after the Middle Ages, and that during Medieval times the river changed from a system with two or more channels to a system with one single channel. This is probably related to increasing deforestation after 1350 AD. Dating results of the Dijle floodplain show that the sedimentation rates are largely influenced by land use with main deposition after the Middle Ages. There is a gradual increase in sedimentation rate since Neolithic times and each new cultural period is recognized by an increase in sedimentation rate related to the intensification of land use. Several sites show that sedimentation rates have recently decreased, probably due to a reduction in cropland area. 12 Dating of the Geul River floodplain suggests a high sedimentation rate during the 19th century and lower rates for more recent times, which can be related to the more intense 19th century land combined with mobilization of sediments by the mining activities, which ended at the end of that century. From the data collected in these catchments it is clear that land use changes are the main driving factors for accelerated alluvial sediment deposition rates, although climate fluctuations can have influenced the impact of land use changes. [less ▲]

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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 detailImagerie fonctionnelle et coma: implications pronostiques
Vanhaudenhuyse, Audrey ULg

Conference (2008)

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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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