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See detailDual Citizenship and Home-country Voting
Lafleur, Jean-Michel ULg

Conference (2010, May 05)

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See detailHow do insects communicate with a cadaver?
Dekeirsschieter, Jessica ULg; Verheggen, François ULg; Frederickx, Christine ULg et al

Conference (2010, May 05)

Detailed reference viewed: 113 (7 ULg)
See detailL’édition littéraire en Belgique au passé et au présent
Durand, Pascal ULg; Habrand, Tanguy ULg

Conference (2010, May 05)

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See detailBiosensors in Forensic Sciences
Frederickx, Christine ULg; Verheggen, François ULg; Haubruge, Eric ULg

Conference (2010, May 05)

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See detailOccurrence of the multicolored ladybird, Harmonia axyridis PALLAS in Walloon agro-ecosystems
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Conference (2010, May 05)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted to temperate climate conditions and to spread out all over Europe. Now, H. axyridis is one of the coccinellid with the biggest size in Belgium, causing damages to the ecosystems through e.g. intraguild predation (IGP). We are still lacking information about the consequences of the introduction of this superpredator in our agro-ecosystems. This work focuses on the potential impacts of H. axyridis on the entomofauna associated with several crops (potatos, corn, wheat, broad bean). We evaluated in 2009 the occurrence as well as the interactions between aphids and their natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystem sites in northern Wallonia. After one year of field observations, were found thirteen coccinellid species, most of the catched individuals being H. axyridis with 64% of the coccinellids, Propylea 14-punctata, 15%, or Coccinella 7-punctata, 14%. This invasive ladybird dominates the group of coccinellids generally in all crops in north Wallonia. The results with the sticky traps show that the maximum occurrence of H. axyridis in crops is observed in chicory, sugar beet and potatoes. The relationship aphid-ladybird in wheat for example, brings out that increase of density of Asian ladybird in mid-July follow the increase of aphids (Sitobion avenae, Sitobion fragariae, Metopolophium dirhodum, Aphis fabae) in the end of June. We also observe that, in most agro-ecosystems, hoverflies and lacewings are the dominant aphid natural enemies. In all crops investigate, the multicolored ladybird occurs with 5% of the aphidophagous after the Chrysopidae, 12% and the Syrphidae, 76%. In 2009, the agro-ecosystems with the most aphidophagous species are carrot and broad bean and these habitats are dominated by hoverflies. [less ▲]

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See detailThe chemical ecology of ladybird beetles
Durieux, Delphine ULg; Verheggen, François ULg; Vandereycken, Axel ULg et al

Conference (2010, May 05)

Ladybird beetles (Coleoptera: Coccinellidae) use a wide variety of semiochemicals to communicate with each other, e.g. finding a mate, protecting themselves from predation or cannibalism, finding a ... [more ▼]

Ladybird beetles (Coleoptera: Coccinellidae) use a wide variety of semiochemicals to communicate with each other, e.g. finding a mate, protecting themselves from predation or cannibalism, finding a shelter to overwinter or ensuring a better survival for their offspring. But chemical communication upon ladybeetles has also found recently to occur with their prey, their prey-host plants and even within their interactions with their natural enemies. Thorough studies on ladybird behaviours towards these compounds could lead to their practical implementation in integrated strategies using ladybirds to control pests, like aphids or mealybugs. [less ▲]

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See detailUniversity-SME's-Government : combining energies for innovation
Morant, Michel ULg

Conference (2010, May 04)

How University can play a role in the open innovation process

Detailed reference viewed: 14 (5 ULg)
See detailSimulation of glacial-interglacial atmospheric CO2 variations using a comprehensive Earth system model of intermediate complexity
Brovkin, Victor; Ganopolski, Andrei; Calov, Reinhard et al

Conference (2010, May 04)

The mechanisms of strong glacial-interglacial variations in the atmospheric CO2 concentration and the role of CO2 in driving glacial cycles still remain debatable. Here using the model of intermediate ... [more ▼]

The mechanisms of strong glacial-interglacial variations in the atmospheric CO2 concentration and the role of CO2 in driving glacial cycles still remain debatable. Here using the model of intermediate complexity CLIMBER-2 which includes all major components of the Earth system – atmosphere, ocean, land surface, ice sheets, terrestrial biota and weathering, aeolian dust and marine biogeochemistry – we performed simulation of the last glacial cycle using variations in the Earth’s orbital parameters as the only prescribed climatic forcing. The model simulates rather realistically temporal and spatial dynamics of the Northern Hemisphere glaciation and temporal dynamics of the atmospheric CO2 concentration. During the glacial inception, the model is able to simulate a decrease in the atmospheric CO2, despite of release of terrestrial biosphere carbon. The drop in CO2 concentration during the first part of the glacial cycle is between 20 and 40 ppmv. It is related primarily to the physical mechanisms – increase of the ocean solubility and relative volume and the age of the Antarctic bottom water masses. The latter is related to increased sea ice formation in the Southern Ocean and lowering of the surface salinity in the northern North Atlantic. During the second part of the glacial cycle, the atmospheric CO2 concentration decreases towards the level of 200 ppmv. A part of this drop is due an increase of biological productivity in the Southern Ocean which is directly related in the CLIMBER-2 model to increase of aeolian dust supply into the Southern Hemisphere via the iron fertilization mechanism. Significant part of the decreasing CO2 trend is also explained by increased weathering on land, especially on the exposed tropical shelves. A decrease in shallow water carbonate sedimentation and shift of CaCO3 sedimentation towards the deep ocean also plays important role in CO2 decrease. With the onset of the glacial termination, initial rise in the atmospheric CO2 concentration is explained by a weakening of the Atlantic thermohaline circulation due to increased freshwater input into the northern North Atlantic. The model is able to simulate the return of CO2 concentration to its interglacial value after termination of the glacial cycle but simulated CO2 concentration still lags considerably behind the ice core reconstructions. [less ▲]

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See detailThe Rain Ratio Hypothesis: Can it be Rescued?
Munhoven, Guy ULg

Conference (2010, May 04)

The Rain Ratio Hypothesis (Archer and Maier-Reimer, 1994, Nature 367, 260–263) ascribes an important part of the observed glacial-interglacial variations of CO2 in the atmosphere to reduced sea-floor rain ... [more ▼]

The Rain Ratio Hypothesis (Archer and Maier-Reimer, 1994, Nature 367, 260–263) ascribes an important part of the observed glacial-interglacial variations of CO2 in the atmosphere to reduced sea-floor rain ratio (i.e., carbonate-C/organic-C in the biogenic particle flux at the sea-floor) during glacial times. With a lower sea-floor rain ratio the influence of organic carbon respiration on carbonate dissolution is stronger. The deep-sea carbonate ion concentration required for global ocean carbonate compensation will then be higher, which in turn contributes to lower atmospheric pCO2. Munhoven (2007, Deep-Sea Research II, 722–746) showed that the suggested rain ratio reductions lead to unrealistic sedimentary records for %CaCO3: the transition zone changes in the model sedimentary record were too large and opposite in phase to available observational data. The rain ratio reduction applied by Munhoven (2007) was uniform over the ocean and the author hypothesised that a non-uniform reduction could change the complete picture. If the rain ratio variations had primarily taken place in open ocean areas of great depth—essentially in regions where the sea floor was deeper than the saturation horizon or the CCD—then the transition zone boundaries could possibly have moved less. Here, we test this hypothesis and analyse the effect of depth dependent variations. It is shown that concentrating rain ratio changes over areas of greatest water depth completely alters the sedimentary imprint: the phase relationship of the signal reverts (compared to the uniform case) and the amplitude of the change decreases, bringing it into better agreement with the observations. However, the pCO2 response is also reduced. The global average rain ratio reduction of 40% that yielded a 40 ppm reduction of atmospheric pCO2 in the uniform case only leads to 25 ppm in this non-uniform case. Results for other depth-dependent reductions will also be discussed. [less ▲]

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See detailAuroral footprints of tail reconnection at Jupiter and Saturn
Radioti, Aikaterini ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010, May 03)

Tail reconnection at Jupiter’s magnetosphere, has recently been shown to leave its signature in the aurora. The Hubble Space Telescope observed transient polar dawn spots on the Jovian aurora, with a ... [more ▼]

Tail reconnection at Jupiter’s magnetosphere, has recently been shown to leave its signature in the aurora. The Hubble Space Telescope observed transient polar dawn spots on the Jovian aurora, with a characteristic recurrence period of 2-3 days. Because of their periodic occurrence cycle and observed location, it is suggested that the transient auroral features are related to the precipitated, heated plasma during reconnection processes taking place in the Jovian magnetotail. Particularly, it is proposed that the transient auroral spots are triggered by the planetward moving flow bursts released during the process. A comparison of their properties with those of the <br />auroral spots strengthen the conclusion that they are signatures of tail reconnection. <br />Cassini recently revealed magnetotail reconnection events at Saturn similar to those observed at Jupiter. Based on the UVIS dataset we present transient features at Saturn’s polar auroral region, which are possible signatures of tail reconnection. We study their size, power, duration and duty cycle and we suggest possible triggering mechanisms associated with magnetotail dynamics. We compare these auroral emissions with those at Jupiter and we discuss how energy is transferred to the ionosphere during tail reconnection. [less ▲]

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See detailTowards a comprehensive C-budgeting approach of a cocoliothophorid bloom in the northern Bay of Biscay: results from PEACE project.
Harlay, Jérôme ULg; Borges, Alberto ULg; Delille, Bruno ULg et al

Conference (2010, May 03)

During coccolithophorid blooms, carbon (C) cycling in the photic zone is driven by the production and the degradation of organic matter (primary production and community respiration), as well as the ... [more ▼]

During coccolithophorid blooms, carbon (C) cycling in the photic zone is driven by the production and the degradation of organic matter (primary production and community respiration), as well as the production and the dissolution of biogenic calcium carbonate (CaCO3). Organic and inorganic metabolisms lead to a transfer of carbon to depth and both impact the flows of carbon dioxide (CO2) in the water column and the CO2 flux across the air-sea interface. Furthermore, due to complex dynamics of coccolithophores, the impact of metabolic C fluxes on CO2 fluxes is variable in time, depending on the stage of the bloom development, and mainly on the ratio of calcification to primary production (CAL:GPP). Understanding and quantifying C cycling of coccolithophorid blooms in natural conditions is a prerequisite to correctly validate biogeochemical models aiming at predicting feedbacks related to ocean acidification, which incorporate knowledge obtained from perturbation laboratory experiments. We carried out a trans-disciplinary cruise on board the R/V Belgica at the continental margin of the Bay of Biscay, in the midst of a coccolithophorid bloom, during which 14C primary production (GPPp), 14C calcification (CAL) and O2-based pelagic community respiration rates (PCR) were determined in the water column. [less ▲]

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See detailBiodegradable microbeads based on poly(L-lactide) as microcarriers for tissue engineering
Tsoy, A.M; Köttgen, Cindy; Grandfils, Christian ULg et al

Conference (2010, May 03)

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See detailParticle export with coccolithophorid Emiliania huxleyi blooms in the Bay of Biscay. XII International Symposium on Oceanography of the Bay of Biscay
Schmidt, Sabine; Harlay, Jérôme ULg; Roevros, Nathalie et al

Conference (2010, May 03)

Coccolithophores, one of the most productive calcifying phytoplanktonic groups, often form massive blooms in the temperate and sub-polar oceans, and in particular at continental margins and in shelf seas ... [more ▼]

Coccolithophores, one of the most productive calcifying phytoplanktonic groups, often form massive blooms in the temperate and sub-polar oceans, and in particular at continental margins and in shelf seas. Export of organic carbon and calcification are the main drivers of the biological CO2 pump and are expected to change with oceanic acidification. Coccolithophores are also a major producer of dimethyl sulphide (DMS), whose oxidation products of DMS affect the number and size distribution of tropospheric cloud condensation nuclei, with possible consequences for cloud albedo and heat balance. Coccolithophores are further known to produce transparent exopolymer particles (TEP) that promote particle aggregation and sinking. Coccolithophores play thus key roles in the global carbon, carbonate and sulphur cycles, and, in turn, in climate regulation. The objectives of the Belgian CCCC project (Role of Oceanic Production and Dissolution of Calcium Carbonate in Climate Change) was to evaluate the role in climate regulation of calcification, primary production and export processes during coccolithophorid blooms. Field investigations, supported by remote sensing data, were conducted in the Northern Gulf of Biscay on the continental shelf and slope region (47°- 50°30'N, 5°-11°W) where coccolithophorid blooms are frequently and recurrently observed. During the cruises in May 2002 and 2003 on board the r/v Belgica, fundamental variables (temperature, salinity, primary production, Chl. a, particulate organic carbon) were measured in the water column. To estimate the spatial variability of particle dynamics in surface waters in relation with the coccolithophorid bloom development, we had employed the natural radionuclide 234Th. The preferential scavenging of the particle-reactive daughter 234Th (t1/2= 24.1 days) while its soluble parent, 238U, remains nearly constant, provides an appropriate tool for assessing temporal variations of the removal of particles from surface waters, at a time scale of weeks. The two cruises have permitted to sample two different situations; in particular in May 2002, it was possible to sample a well-developed bloom. As a result, 234Th present contrasted profiles in the upper 0-80 m during the two investigations. In May 2003, 234Th was nearly in equilibrium with 238U (its radioactive parent) along with high particulate activities: this seems to indicate an early bloom situation with low grazing fluxes. On the opposite, in May 2002, deficits of 234Th toward 238U were indicating more efficient particle export from upper waters. Synthesis of the acquired data will be discussed to compare particle dynamics and the magnitude of particulate carbon export using 234Th and POC data at different states of coccolithophorid bloom in the Northern Gulf of Biscay. [less ▲]

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See detailBiodegradable microcarriers with entrapped peptides for tissue engineering
Markvicheva, E; Prudchenko, I; Tsoy, A et al

Conference (2010, May 03)

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See detailAn evaluation of the contributions of the distant and near-Earth neutral lines to magnetotail reconnection rates and magnetic flux closure
Milan, Steve; Boakes, Peter; Imber, Suzanne et al

Conference (2010, May 01)

The expanding-contracting polar cap paradigm relates the dayside and nightside rates of magnetic reconnection to changes in the size of the ionospheric polar cap, the amount of magnetic flux in the ... [more ▼]

The expanding-contracting polar cap paradigm relates the dayside and nightside rates of magnetic reconnection to changes in the size of the ionospheric polar cap, the amount of magnetic flux in the magnetotail lobes, and the excitation of ionospheric and magnetospheric plasma convection. Expansions of the polar cap are the consequence of dayside reconnection, the merging of interplanetary magnetic flux with the terrestrial dipole to increase the proportion of the dipole that is open. Contractions of the polar cap are caused by magnetic reconnection in the magnetotail at a distant neutral (or X-) line (DXL) and near-Earth neutral line (NEXL), the latter especially during substorms, to reduce the open flux in the magnetosphere. There is debate surrounding the proportion of flux closure provided by the DXL and NEXL, and hence whether substorms dominate the nightside contribution to ionospheric and magnetospheric convection. This study utilizes a 7-day interval of auroral observations from the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite and convection measurements by the Super Dual Auroral Radar Network (SuperDARN) to quantify the nightside rates of reconnection during substorm and non-substorm periods and hence investigate DXL and NEXL flux closure. [less ▲]

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See detailRecent developments in optimization of flexible components of multibody systems
Duysinx, Pierre ULg; Emonds-Alt, Jonathan; Virlez, Geoffrey ULg et al

Conference (2010, May)

Recently mechanical engineering has extended from a component to a system oriented approach. The structural analysis of components is now completed by the whole mechanical system simulation using ... [more ▼]

Recently mechanical engineering has extended from a component to a system oriented approach. The structural analysis of components is now completed by the whole mechanical system simulation using multibody system analysis. This evolution aims at capturing better the real loading conditions accounting for the component interaction and couplings in the system. Structural optimization is continuing along the same tracks. Recent works in structural optimization have tried to optimize components with respect to loadings conditions defined through dynamic loading coming from multibody system dynamic analysis. Generally, optimization techniques consider that the structural component is isolated from the rest of the mechanism and use simplified quasi-static load cases to mimic the complex loadings in service. In contrast, we have shown in previous works devoted to topology optimization that an optimization directly based on the dynamic response of the flexible multibody system leads to a more integrated approach. In order to overcome the limitations of some previous approaches, a more integrated optimization technique is proposed here, based on the nonlinear finite element approach for flexible multibody systems. The non linear finite element formalism accounts for both large rigid-body motions and elastic deflection of the structural components. In previous work, the optimal design of components was realized as an optimal truss / beam layout. The present communication investigates the optimal design of components considered as a continuum medium. We study first sizing optimal design of structural components and we later extend the method to optimal material distribution approach to address their lay out optimization. The continuum domain is discretized into finite elements. For sizing optimization, the design variables are wall-thickness and lumped element variables. For topology optimization the design variables are classically density-like parameters associated to a power law interpolation of effective material properties for intermediate densities, also known as Simply Isotropic Material with Penalization (SIMP). This study assesses the feasibility of this approach, which extends optimization techniques to continuum flexible bodies included in MBS. The numerical implementation is conducted in SAMCEF MECANO for the flexible MBS analysis and BOSS Quattro for the optimization shell. The nonlinear equations of motion are solved using a generalized-a time integration scheme while the sensitivity analysis of mechanical responses is based on a direct differentiation method or finite differences. For sizing and parametric optimization the paper investigates and compares several optimization approaches methods such as classical gradient-based methods (SQP, Augmented lagrangian), sequential convex programming methods (CONLIN, MMA), but also surrogate-based optimization method (with Neural Networks) combined with genetic algorithms. The formulation of the problem is also discussed, and its influence on the convergence history is illustrated. Optimal sizing, shape and topology optimization of a simple model of a robot are addressed. The optimization approach is illustrated on numerical applications of sizing optimization of robot arms during trajectory tracking and lightweight layout optimal design of automotive components. [less ▲]

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See detailLa méthode des cas en gestion des ressources humaines
Dujardin, Jean-Marie ULg

Conference (2010, May)

Detailed reference viewed: 44 (17 ULg)
See detailPenser la justice en contextes islamiques
Nachi, Mohamed ULg

Conference (2010, May)

Inscrire la question de la justice dans les contextes des sociétés islamiques pour en montrer la spécificités et les différentes dimensions sociales, culturelles, politiques, éthiques, etc.

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See detailAir-ice CO2 fluxes and pCO2 dynamics in sea ice in the Arctic coastal area (Amundsen Gulf, Canada)
Geilfus, Nicolas-Xavier ULg; Tison, Jean Louis; Carnat, Gauthier et al

Conference (2010, May)

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See detailBayesian hierarchical linear regression for the validation of analytical methods
Lebrun, Pierre ULg; Boulanger, Bruno ULg; Rozet, Eric ULg et al

Conference (2010, May)

Analytical quantitative methods are widely used to quantify analytes of interest, for instance in pharmaceutical formulations, linking an observed response to the concentration of one compound of the ... [more ▼]

Analytical quantitative methods are widely used to quantify analytes of interest, for instance in pharmaceutical formulations, linking an observed response to the concentration of one compound of the formulation. Current methodologies to validate these analytical methods are based on one-way ANOVA random effect model in order to estimate repeatability and intermediate precision variances. This model is then applied several times at different concentration levels over a range of concentrations where the method is intended to be used, assuming independency between the levels. In this way, the capacity of the method to be able to quantify accurately is assessed at various concentration levels, and the method is said to be fitted for purpose (or valid) at the concentration level(s) where it shows trueness and precision that are fully acceptable, i.e. within predefined acceptance limits. Problem of such approach is the amount of data required and the time needed to collect them, while small sample sizes (small number of series and of replicates per series) are often preferred and practiced by laboratories. A better use of the data could then be envisaged. In this presentation, we take into account the response-concentration relationship that exists by the use of a hierarchical linear regression model. Instead of fitting a model at each concentration level that is assessed, only one model is studied. We show how the Bayesian framework is well adapted to this task. Also, as a predictive tool, we naturally derive beta-expectation and beta-gamma content tolerance intervals by means of MCMC simulations. The Bayesian modeling can also include informative prior information whenever justified, leading to reliable decisions given the domain knowledge. [less ▲]

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See detailIntentionnalité et intentionnalisme chez Brentano
Boccaccini, Federico ULg

Conference (2010, May)

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See detailHow to construct fundamental risk factors?
Lambert, Marie ULg; Hübner, Georges ULg

Conference (2010, May)

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See detailHow the genomic environment of the HTLV-1 provirus impacts on clone fitness
Gillet, Nicolas ULg; Malani, Nirav; Berry, Charles et al

Conference (2010, May)

Detailed reference viewed: 21 (1 ULg)
See detailEarth and sea-level change projections with the Earth system model of intermediate complexity LOVECLIM
Goelzer, H.; Huybrechts, P.; Loutre, M. F. et al

Conference (2010, May)

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See detailIn silico study of the interaction of the Myelin Basic Protein C-terminal a-helical peptide with DMPC and mixed DMPC/DMPE lipid bilayers
Bessonov, Kyrylo ULg

Conference (2010, May)

Biological membranes continue to be extensively investigated in different ways. This paper presents the benefits of Molecular Dynamics (MD) approaches to study the properties of biological membranes and ... [more ▼]

Biological membranes continue to be extensively investigated in different ways. This paper presents the benefits of Molecular Dynamics (MD) approaches to study the properties of biological membranes and proteins using the freely available GROMACS package, in the context of the Myelin Basic Protein (MBP) C-terminal a-helical peptide. A mixed membrane consisting of 2-Dimyristoyl-sn-Glycero-3-phosphocholine/1,2-Dimyristoyl-sn-Glycero-3- phosphoethanolamine (DMPC/DMPE), and pure DMPC membranes, composed of 188 and 248 lipids, respectively, were simulated for 200 ns at 309 K. The DMPC membrane was approximately three times more fluid compared to the DMPC/DMPE system, with the diffusion coefficients (D) being 0.0207x10-5 cm2/s and 0.0068x10-5 cm2/s, respectively. In addition, the 14-residue peptide representing the C-terminal a-helical region of murine Myelin Basic Protein (MBP), with amino acid sequence NH2-A141YDAQGTLSKIFKL154-COOH , was simulated in both membrane systems for 200 ns. The peptide penetrated further into the DMPC bilayer compared to the mixed DMPC/DMPE bilayer, potentially because of the reduced accessibility of the charged peptide amino acid side chains to the formal positive charge of the amine N atom surrounded by methyl and methylene groups in DMPC, that might have resulted in greater overall peptide mobility [3]. These findings are significant in their implication that membrane composition affects the behavior of MBP, providing further insights into myelin structure. Our preliminary results suggest that local changes in membrane composition (e.g. enrichment in DMPE molecules), as well as, electrostatic nature of primary amino acid sequence could cause localized denaturation / instability of external MBP a-helices possibly augmenting the degradation of myelin in multiple sclerosis (MS), resulting in a subsequent decrease of nerve impulse propagation efficiency. [less ▲]

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See detailComparaison des méthodes de Lord et de la régression logistique pour la détection du fonctionnement différentiel des items
Raîche, Gilles; Magis, David ULg; Béland, Sébastien

Conference (2010, May)

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See detailPortfolio Theory with Venture Capital
François, Pascal; Hübner, Georges ULg

Conference (2010, May)

This paper studies the contracting choices between an entrepreneur and venture capital investors in a portfolio context. We rely on the mean-variance framework and derive the optimal choices for an ... [more ▼]

This paper studies the contracting choices between an entrepreneur and venture capital investors in a portfolio context. We rely on the mean-variance framework and derive the optimal choices for an entrepreneur with and without the presence of different kinds of venture capitalists. In particular, we show that the entrepreneur always has the incentive to share the risk and benefits of the venture whenever possible. On the basis of their objectives and characteristics, we distinguish the situations of the corporate, independent, and bank-sponsored venture capital funds. Our framework enables us to derive the optimal contract design for the entrepreneur, featuring the choice of investor, the entrepreneur's investment in the venture, and her dilution in the project's equity as a function of her bargaining power. This result allows us to characterize the choice of the investor depending on her cost of equity and debt capital. In addition to project size and risk, entrepreneur's risk aversion turns out to be a critical determinant of VC investor choice -- a finding which is strongly supported by a panel analysis of VC fund flows for 5 European countries over the 2002--2009 period. [less ▲]

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See detailComment développer le portfolio étudiant au supérieur ? Analyse de dispositifs innovants à l’Université de Liège
Deum, Mélanie ULg; Gruslin, Isabelle ULg; Peters, Stéphanie ULg et al

Conference (2010, May)

Depuis 2008, l’Institut de Formation et de Recherche en Enseignement Supérieur de l’Université de Liège (IFRES) accompagne des innovations pédagogiques qui consistent, notamment, en l’implantation de ... [more ▼]

Depuis 2008, l’Institut de Formation et de Recherche en Enseignement Supérieur de l’Université de Liège (IFRES) accompagne des innovations pédagogiques qui consistent, notamment, en l’implantation de portfolios pour des étudiants de master. Ces initiatives, venant de quatre équipes d’enseignants-chercheurs (Psychologie sociale des groupes et des organisations, Formation d’adultes, Pharmacie et Logopédie), poursuivent des objectifs centrés sur l’articulation théorie-pratique, l’accompagnement de démarches réflexives, le développement et l’évaluation de compétences. Notre communication se focalisera principalement sur la mise en œuvre de ces initiatives au travers des questions suivantes : Comment intégrer un portfolio étudiant dans le cadre d’une formation universitaire? Comment en évaluer son contenu? Comment accompagner les étudiants dans la collecte de preuves significatives ? Des perspectives concernant l’accompagnement de tels projets pédagogiques seront également abordées pour qu’au delà de l’analyse de quelques dispositifs portfolio, notre communication apporte un regard plus critique sur les conditions optimales d’implantation et d’accompagnement d’innovations pédagogiques telles que la mise en place d’un portfolio pour les étudiants. [less ▲]

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See detailWillingness-to-pay for local milk-based dairy products in Senegal
Lefevre, Mélanie ULg

Conference (2010, May)

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Using data from a choice-based ... [more ▼]

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Using data from a choice-based-conjoint analysis conducted on 400 households in the region of Dakar, we evaluate the premium that consumers are willing to pay for fresh raw material (rather than powder) in the composition of sour milk. Based on an Ordered Probit Model, the results show evidence for a positive WTP for fresh raw material, which may be seen as a strong indication of preference for local products. This WTP greatly depends on the characteristics of the households. Wealthier households are willing to pay more than the medium households, while big households are ready to pay much less than the base category ones. Obviously, some niche markets exist, that producers may target to sell the local milk-based dairy products. However, more information has to be provided about the composition of dairy products, as consumers are not currently able to distinguish both types of raw material, even if they are willing to pay more for one of them. In spite of some restrictions about the presence of a potential "hypothetical bias" due to the nature of the data, this study gives a first insight of consumers' preferences for local milk-based dairy products. [less ▲]

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See detailRéappropriation et réapparition. Survivances de Vertigo
Mélon, Marc-Emmanuel ULg

Conference (2010, May)

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See detailTime integration of finite rotations in flexible multibody dynamics using Lie group integrators
Bruls, Olivier ULg; Cardona, Alberto

Conference (2010, May)

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Peer Reviewed
See detailHow to construct fundamental risk factors?
Lambert, Marie ULg; Hübner, Georges ULg

Conference (2010, May)

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See detailMultiparametric observations and analysis in the Bay of Calvi (Corsica), an ideal site for studying the human activity effects and climate changes in the Mediterranean Sea; STARESO
Gobert, Sylvie ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Conference (2010, May)

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed ... [more ▼]

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed in 1969, it is located near Calvi (Corsica, Western Mediterranean Sea) in an oligotrophic area chosen for the exceptional quality of its coastal waters STARESO offers to the oceanographers, by diving or with boats, a direct access to the sea. The variety of the accessible ecosystems is remarkable and unique in the Mediterranean basin: -the Bay of Calvi is characterized by healthy and very diverse biocenosis (e.g. Posidonia meadows, rocky and sandy communities, -a steep submarine canyon, with depths greater than 1 000 meters, is accessible in 15 minutes of navigation; -the Liguro-Provençal front, a major hydrologic structure, is situated between 10 and 15 miles of the coast. STARESO is accessible all the year for everybody and is functioning like an oceanographic research vessel. The Station is a platform for all oceanographic disciplines with a scientific expertise widely based on a long tradition of interdisciplinary work, and a direct access to time series of physical, chemical and biological data registered with automated systems and variety of sensors deployed in the Bay of Calvi since 30 years. This platform provides the opportunity to reach coastal, pelagic, benthic, deep systems with a manageable cost and ship requirements in a pristine zone. [less ▲]

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See detailMicrowave-assisted conversion of carbohydrates. State of the art and outlook.
Richel, Aurore ULg; Laurent, Pascal ULg; Wathelet, Bernard ULg et al

Conference (2010, May)

The valorisation of carbohydrates arising from the hydrolysis of renewable feedstocks (i.e. lignocellulosic biomass) is nowadays an area of outmost interest. In this context, the implementation of fast ... [more ▼]

The valorisation of carbohydrates arising from the hydrolysis of renewable feedstocks (i.e. lignocellulosic biomass) is nowadays an area of outmost interest. In this context, the implementation of fast, expeditous and cost-effective methodologies for the modification of these naturally occurring compounds is becoming a prerequisite. In this sense, the application of microwaves has gained progressive attention in laboratories for making a range of high-added value sugars derivatives scaffolds. Its advantages are numerous and include enhacement of reaction rates and yields combined to improved regio-, chemo- and anomeric selectivities. Since the first publications of Gedye et Giguere in 1986, the use of microwave has progressively emerged as a popular non conventional heating source in the field of organic synthesis.1 Nevertheless, its application in the area of carbohydrate chemistry is less documented.2, 3 Although research in this field is still in its infancy, recourse to microwaves often provides, with remarkable yields and atom efficiency, new carbohydrate-based structures that are not easily available by any another means (or only via painstaking multi-step protocols). This communication proposes therefore selected, recent and non exhaustive illustrations of the application of microwaves to promote famous carbohydrates “model” reactions. The scale-up of such microwave-assisted reactions is also presented. [less ▲]

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See detailUne intentionnalité grammaticale chez Wittgenstein
Gauvry, Charlotte ULg

Conference (2010, May)

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See detailGRANDS TRAVAUX D’AMENAGEMENT ET MOUVEMENTS DE VERSANT. LE CAS DE TAFFRENT( CONSTANTINOIS, ALGERIE)
Benabbas, Chaouki; Chabour, Nabil; Bourefis, Ahcéne et al

Conference (2010, May)

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See detailAbscisic acid signal transduction is altered in Arabidopsis plants deficient in plastidial glyceraldehyde- 3-phosphate dehydrogenase
Muñoz-Bertomeu, Jesús; Cascales - Miñana, Borja ULg; Anoman, Armand D. et al

Conference (2010, May)

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See detailThoughts on fetal growth: tissues and nutrition
Battisti, Oreste ULg

Conference (2010, May)

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See detailDeterministic and stochastic behaviour of L. monocytogenes suspended cells or detached from stainless steel surfaces during cheese manufacture
Belessi, C; Gounadaki, A; Schvartzman Echenique, Maria Sol ULg et al

Conference (2010, May)

Growth probability and kinetic models for Listeria monocytogenes in response to multiple hurdles occurring during cheese anufacturing are mainly focused on suspended L. monocytogenes cells. This study ... [more ▼]

Growth probability and kinetic models for Listeria monocytogenes in response to multiple hurdles occurring during cheese anufacturing are mainly focused on suspended L. monocytogenes cells. This study aimed to compared: (i) the growth/no growth interface of L. monocytogenes cells attached on stainless steel (SS) surfaces, or in suspension, within adjusted media and (ii) the behavior of planktonic and detached Listeria cells during manufacturing and ripening of two popular Greek cheeses: Feta and Graviera. A multi-strains composite of L. monocytogenes isolates from cheese, factory and farm in Greece and Ireland, were grown in TSBYE, MRD, Milk, Feta and Graviera cheese in the presence of SS coupons (2x5cm) for 3d at 20 °C, to obtain the following inocula: planktonic cells (P), and cells detached from the SS coupons (D). Detachment took place by the bead vortexing method. For growth/no growth evaluation P and D cells were inoculated in TSBYE, adjusted to 5 pH (6.8-4.8) by lactic acid and at 4 aw (0.945-0.995) by NaCl. For evaluation of L. monocytogenes kinetics in cheese, P and D cells were inoculated at three simulated stages of Feta and Graviera manufacture: in pasteurized milk, after cutting the curd and after the first ripening. The growth of D cells slightly delayed compared to P cells while it was more affected by aw than pH. On cheese, L. monocytogenes survived throughout the ripening at low levels. The differences in probability of growth of single cells for both inocula (P and D) were assessed by stochastic approaches. Furthermore, PFGE analysis resulted that 91 % of the cells of any tested condition belonged to the cheese factory isolate. The re- sults may address safety implications relevant to the potential of attached cells to proliferate, whereas data may contribute to filling data gaps on risk assessment of L. monocytogenes isolates from the dairy industry. [less ▲]

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See detailL'enlèvement international d'enfants- questions choisies
Pfeiff, Silvia ULg

Conference (2010, May)

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See detailThe assessment of the past decades based on modelling and data analysis: some examples
Grégoire, Marilaure ULg; Gorsky, G.; Sesame participants, .

Conference (2010, May)

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See detailAbsence of Listeria monocytogenes growth during raw milk cheesemaking: a modelling approach
Jordan, Kieran; Schvartzman Echenique, Maria Sol ULg; Maffre, A et al

Conference (2010, May)

The presence of Listeria monocytogenes in certain foods and the risk that this poses to public health and food quality is still a problem. Currently, the field of food mi- crobiology focuses on obtaining ... [more ▼]

The presence of Listeria monocytogenes in certain foods and the risk that this poses to public health and food quality is still a problem. Currently, the field of food mi- crobiology focuses on obtaining data on the behaviour of microorganisms in food, but the responses obtained provide little insight into the relationship between physiological processes and growth or survival. This link can be made through mathematical models. In a simple form, a mathematical model is a simple mathe- matical description of a process. The application of mathematical models to food microbiology has been developed in recent years and now constitutes a new disci- pline named as Predictive Microbiology. However, most predictive models are based on laboratory experiments in microbiological media under static conditions. As such models tend to be inaccurate, we have undertaken our experiments in a food system under dynamic conditions. Cheese was made with raw and pasteurised milk deliberately contaminated with L. monocytogenes . Listeria was monitored through the manufacture and ripening period of the cheese. The results showed that L. monocytogenes did not grow during manufacture of raw milk cheese, but did grow during manufacture of pasteurised milk cheese. The data obtained for growth, survival and inactivation was modelled. The application of models that can explain the behaviour of Listeria in cheese and the further predictions that can be obtained from these models are useful for the improvement of ongoing re- search on biotraceability and for the better understanding of the general behaviour of these microorganisms under dynamic conditions, such as in dairy products [less ▲]

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See detailPoints, chiffres et lettres: la critique des images selon Harun Farocki
Hamers, Jérémy ULg

Conference (2010, April 30)

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See detailDe l'"hermétisme" à l'émancipation: réflexion sur le Mallarmé de Rancière
Pieron, Julien ULg

Conference (2010, April 30)

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See detailError assessment of sea surface temperature satellite data relative to in situ data: effect of spatial and temporal coverage
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Troupin, Charles ULg et al

Conference (2010, April 30)

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is shown. The aim of this study is to better understand the differences between these ... [more ▼]

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is shown. The aim of this study is to better understand the differences between these two data sets, in order to compute merged maps of SST using satellite and in situ data. When merging temperature from different platforms, it is crucial to take the expected RMS error of the observations into account and to correct for possible biases. Different in situ data sensors and platforms (CTD, XBT, drifter, etc) are available for the comparison, each with specificities in the nature of the measurement (accuracy and precision of the measures), and with different spatial and temporal distributions. A comparison with satellite data needs to take these factors into account. Statistics about the differences due to the hour of the day, the month of the year, the type of sensor/ platform used and the spatial distribution is therefore realised through a combination of error measures, diagrams and statistical hypothesis testing. The data used are Advanced Very High Resolution Radiometer (AVHRR) SST day-time and night-time satellite data, and in situ temperature data from various databases (World Ocean Database’05, Coriolis, Medar/Medatlas and ICES). [less ▲]

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See detailUne éthique de la littérature : Foucault, de Kant à Lacan
Bolmain, Thomas ULg

Conference (2010, April 29)

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See detailEffect of ground scattering on noise barriers efficiency
Billon, Alexis ULg; Nemerlin, Jean ULg; Embrechts, Jean-Jacques ULg

Conference (2010, April 29)

Noise barriers are popular devices to mitigate the impact of roads or railway noise on the community. So, heavy works have been devoted to improve their efficiency, both through their shapes and their ... [more ▼]

Noise barriers are popular devices to mitigate the impact of roads or railway noise on the community. So, heavy works have been devoted to improve their efficiency, both through their shapes and their building materials. In this work, the effect of ground scattering on the insertion loss created by a straight hard thin screen is investigated using a 1/10th scale model. The ground possesses thus a repetitive structure to induce scattering. Measurements are conducted on both sides of the screen and comparisons are drawn with a flat ground configuration. [less ▲]

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See detailFunctions of Binary Variables and Nonlinear 0-1 Optimization
Crama, Yves ULg

Conference (2010, April 29)

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See detailAntibiotics and pesticides residues in aquaculture products
Scippo, Marie-Louise ULg

Conference (2010, April 28)

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See detailGrammatical integration of loanwords in Late Egyptian
Winand, Jean ULg

Conference (2010, April 28)

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See detailLe syndrome néphrotique
Bovy, Christophe ULg; Krzesinski, Jean-Marie ULg

Conference (2010, April 27)

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See detaill'affranchissement des stéréotypes sexués chez les adolescents comme facteur de meilleure réussite scolaire
Gavray, Claire ULg

Conference (2010, April 27)

les stéréotypes genrés restent significativement ancrés chez les adolescents, et cela plus chez les garçons que chez les filles qui développent de nouvelles façons de penser et d'agir qui s'avèrent ... [more ▼]

les stéréotypes genrés restent significativement ancrés chez les adolescents, et cela plus chez les garçons que chez les filles qui développent de nouvelles façons de penser et d'agir qui s'avèrent payantes d'un point de vue scolaire mais qui sont inégalement réparties entre les groupes sociaux et culturels d'origine. les garçons ont tendance à partager un bon nombre de stéréotypes sexués, quel que soit leur groupe social et culturel, sauf en ce qui concerne la valorisation outrancière du recours à la force pour s'imposer. Celle-ci agit plus souvent en compensation d'une position statutaire et scolaire défavorable et d'un avenir perçu comme bouché et injuste....Elle précipite aussi l'échec en français et la dévalorisation de tout ce qui est perçu comme renvoyant à l'univers féminin.... [less ▲]

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See detailCoptic kata vs Greek κατά: A Case-Study in Contrastive Semantics
Polis, Stéphane ULg

Conference (2010, April 26)

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See detailAnalyse de la marche/course chez le sportif
Kaux, Jean-François ULg

Conference (2010, April 26)

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See detailLe cinéma au risque du musée : le spectateur exposé
Thonon, Jonathan ULg

Conference (2010, April 26)

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See detailQuand la censure fonctionne à plein régime. Autour de la question algérienne
Sindaco, Sarah ULg

Conference (2010, April 24)

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See detailLa pathologie hypothalamo-hypophysaire post-traumatique
VALDES SOCIN, Hernan Gonzalo ULg; Beckers, Albert ULg

Conference (2010, April 24)

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See detailLes troubles bipolaires dans la petite enfance : une sémiologie dimensionnelle du normal au pathologique
Scholl, Jean-Marc ULg

Conference (2010, April 24)

Les médecins confrontés à la petite enfance, particulièrement les neuropédiatres, les pédiatres et les pédopsychiatres, sont en attente de repères sémiologiques précis leur permettant de mieux discriminer ... [more ▼]

Les médecins confrontés à la petite enfance, particulièrement les neuropédiatres, les pédiatres et les pédopsychiatres, sont en attente de repères sémiologiques précis leur permettant de mieux discriminer les difficultés propres de l'enfant. La bipolarité est une affection qui nécessite, plus que d'autres, l'acquisition de meilleurs repères cliniques. Pour répondre à cette attente, la recherche sémiologique présentée dans cet exposé a mis en lumière une sémiologie, non pas catégorielle, mais dimensionnelle, c'est-à-dire une sémiologie précisant chaque micro-signe pour lui-même, et, en le considérant dans un continuum du normale au pathologique. C'est l'intensité de ce signe ou la présence concomitante d'autres signes, qui mettront l'enfant en difficulté ou en souffrance, faisant ainsi passer ce signe vers un aspect pathologique. De plus, cette recherche a tenté de préciser l'évolution développementale de cette sémiologie, en fonction de l'âge. Ainsi, cet exposé aboutit à la description d'une sémiologie très fine de la bipolarité, et à la proposition d'une classification des états bipolaires dans la petite enfance. Il donne également un diagnostic différentiel précis entre Bipolarité et Troubles de l'attention avec ou sans hyperactivité. [less ▲]

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See detailOrthodontics and Periodontology
LAMBERT, France ULg

Conference (2010, April 24)

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See detailLa salive, une nouvelle matrice alternative en toxicologie
Collart, Anne-Françoise ULg

Conference (2010, April 23)

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See detailL’insertion professionnelle des comédiens
Brahy, Rachel ULg; Fraiture, Sébastien ULg; Megherbi, Salim ULg

Conference (2010, April 23)

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See detailLe culte moderne de la mémoire : patrimoine et philosophie du soupçon
Dawans, Stéphane ULg

Conference (2010, April 23)

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See detailDe la périurbanisation diffuse à la ville compacte qualitative
Halleux, Jean-Marie ULg

Conference (2010, April 23)

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See detailCassandre's results from the Kwalon experiment
Lejeune, Christophe ULg

Conference (2010, April 23)

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See detailIndéterminations de la photographie (I)
Havelange, Carl ULg

Conference (2010, April 23)

Detailed reference viewed: 17 (9 ULg)
See detailprisons : l'espace privé en question
Tieleman, David ULg

Conference (2010, April 23)

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See detailHigh Multiplicity Scheduling Problems and Just-In-Time Scheduling
Crama, Yves ULg

Conference (2010, April 22)

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See detailHypertension
Krzesinski, Jean-Marie ULg

Conference (2010, April 21)

Detailed reference viewed: 12 (2 ULg)
See detailLa recette de cuisine : essai de définition
Colson, Maryse ULg

Conference (2010, April 21)

Detailed reference viewed: 43 (10 ULg)