Publications ORBi OA
Bookmark and Share    
Full Text
See detailPALETTE: Online pedagogical catalogue of tools and services
Denis, Brigitte ULg; Vandeput, Etienne ULg

Report (2009)

This deliverable presents services and tools developed during the PALETTE project. Online descriptions, video teasers and printable documents are available from a “Service Gallery”. The teasers provide ... [more ▼]

This deliverable presents services and tools developed during the PALETTE project. Online descriptions, video teasers and printable documents are available from a “Service Gallery”. The teasers provide information from different points of views: a problem evoked by a CoP member, the answer provided by the developer and a supplementary account by a CoP mediator or an educationist. A series of printable documents give information on the services from the developer’s and a learning specialist’s points of views. The interface of the Service Gallery also provides a link to the PALETTE portal. A short survey helps the potential users to choose which service start to explore. A link to the Learning and Organisational Resources and another one to examples of generic scenarios illustrate some potential uses of the tools and services in order to sustain CoP’s activities. From the end of the PALETTE project (February 2009), these resources will be available from a website hosted at the CRP. [less ▲]

Detailed reference viewed: 60 (6 ULg)
Full Text
Peer Reviewed
See detailComparison of Ultra Capacitors, Hydraulic Accumulators and Batteries Technologies to Optimize Hybrid Vehicle Ecoefficiency
Nzisabira, Jonathan; Louvigny, Yannick ULg; Duysinx, Pierre ULg

in Proceeding of 2nd IEEE Int. Conference of Power Engineering, Energy, and Electric Drives (2009, March)

The main objective of vehicle powertrain hybridization is to improve the fuel consumption and environment pollutants impact (Eco-score) without decreasing the vehicle performances and other user ... [more ▼]

The main objective of vehicle powertrain hybridization is to improve the fuel consumption and environment pollutants impact (Eco-score) without decreasing the vehicle performances and other user satisfaction criteria. The Eco efficiency is a global index which accounts for both environmental impacts and user satisfaction. The Hybrid vehicles ability to overcome these two requirements depends on the optimal choice of their key mechanical, electric or hydraulic components. Some energy storage systems like ultra capacitors and hydraulic system are environmentally friendly and meet some user satisfaction criteria like daily cost, security, short charge/discharge duration and long life service. On the contrary, others like batteries have some times a environmental impact mitigate. The objective of this study is to establish a comparison between HEV (hybrid electric vehicle) and HHV(hybrid hydraulic vehicle) configuration by highlighting the effect of different energy storage systems (batteries, ultra capacitors, hydraulic system), mechanical and electric components sizes (engine, motors) upon the optimized HEV design taking care of both Eco-score and User satisfaction for different driving scenarios. The approach is formulated as a multidisciplinary optimization problem. At first, the HEV and HHV are modeled and simulated using ADVISOR (advanced vehicle simulator) with respect to several driving situations. Then emissions can be determined and the Ecoscore indicator can be calculated. User Satisfaction can be evaluated based on performance criteria extracted from ADVISOR simulation and on simple evaluation tools relying on the state-of-the art of technological information for safety, reliability and daily cost. The design problem is stated as follows: select mechanical, electric or hydraulic components (e.g. engine, motor and energy storage system sizes) to minimize the Ecoscore indicator and to maximize user satisfaction criteria subject to catalogue constraints on the choice of the components. The approach is illustrated on applications dealing with mild parallel hybrid buses. Results show that the hybrid electric buses using ultra capacitors have almost the same performances as those using batteries. However, the preferred choice would go towards super capacities because they have other appreciable properties compared to the batteries: the very high lifetime, high efficiency of charge and discharge and no polluting recyclability. Despite a smaller fuel saving than a HEV, the HHV technology has a chance to compete with HEV because of the hydraulic components low cost (industrial maturity), no pollutants recyclability due to the possible using of water as motor/pump fluid. HHV technology is a possible alternative in niche markets such as urban buses; bin-lorries or heavy urban delivery vehicles. [less ▲]

Detailed reference viewed: 350 (9 ULg)
Full Text
See detailLe portfolio appliqué à la formation en logopédie
Maillart, Christelle ULg; Deum, Mélanie ULg; Grevesse, Pascale ULg et al

Poster (2009, March)

Detailed reference viewed: 280 (43 ULg)
Full Text
See detailAlimentation durable : De la promotion des filières courtes à la promotion d’emplois durables
Ozer, Pierre ULg; Bay, Maud ULg

Scientific conference (2009, March)

Consommation durable ? Le thème de la consommation durable est relativement neuf. Il trouve ses origines au Sommet de la Terre qui s’est tenu en 1992 à Rio de Janeiro. Ce thème part du constat que les ... [more ▼]

Consommation durable ? Le thème de la consommation durable est relativement neuf. Il trouve ses origines au Sommet de la Terre qui s’est tenu en 1992 à Rio de Janeiro. Ce thème part du constat que les politiques publiques ne peuvent plus seulement se contenter d’agir sur la production ; infléchir également les modes de consommation écologiquement et socialement non soutenables étant devenu indispensable pour parvenir à un développement durable. Mais cela pose une série de questions. Quelles sont actuellement les spécificités des modes de consommation des ménages ? Quelles sont leurs capacités à évoluer vers la prise en compte des critères du développement durable ? Quels sont les rôles que doivent jouer les pouvoirs publics, les acteurs économiques et associatifs dans la consommation durable ? [less ▲]

Detailed reference viewed: 617 (45 ULg)
Full Text
See detailDémocratie et Internet
Lejeune, Christophe ULg

Article for general public (2009)

Detailed reference viewed: 115 (7 ULg)
Full Text
See detailLe réalisme sale de Guillermo Fadanelli
Vanden Berghe, Kristine ULg

Article for general public (2009)

Detailed reference viewed: 100 (8 ULg)
Full Text
See detailLe théâtre-action, expression des minorités...
Brahy, Rachel ULg

Article for general public (2009)

Detailed reference viewed: 116 (25 ULg)
Full Text
Peer Reviewed
See detailClinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe
Monty, Arnaud ULg; Mahy, Grégory ULg

in Oecologia (2009), 159(2), 305-315

The dynamics of plant population differentiation may be integral in predicting aspects of introduced species invasion. In the present study, we tested the hypothesis that European populations of Senecio ... [more ▼]

The dynamics of plant population differentiation may be integral in predicting aspects of introduced species invasion. In the present study, we tested the hypothesis that European populations of Senecio inaequidens (Asteraceae), an invasive species with South African origins, differentiated during migration from two independent introduction sites into divergent altitudinal and climatic zones. We carried out 2 years of common garden experiments with eight populations sampled from Belgian and ten populations from French altitudinal transects. The Belgian transect followed a temperature and precipitation gradient. A temperature and summer drought gradient characterized the French transect. We evaluated differentiation and clinal variation in plants germinated from field-collected seed using the following traits: days to germination, days to flowering, height at maturity, final plant height and aboveground biomass. Results showed that S. inaequidens populations differentiated in growth traits during invasion. During the 1st year of sampling, the results indicated clinal variation for growth traits along both the Belgium and French altitudinal transects. Data from the 2nd year of study demonstrated that with increasing altitude, a reduction in three growth traits, including plant height at maturity, final plant height and aboveground biomass, was detected along the French transect, but no longer along the Belgian one. Phenological traits did not exhibit a clear clinal variation along altitudinal transects. The possible evolutionary causes for the observed differentiation are discussed. [less ▲]

Detailed reference viewed: 77 (17 ULg)
Full Text
Peer Reviewed
See detailAn explicit test for the contribution of environmental maternal effects to rapid clinal differentiation in an invasive plant
Monty, Arnaud ULg; Lebeau, Julie; Meerts, Pierre et al

in Journal of Evolutionary Biology (2009), 22(5), 917-926

Population differentiation of alien invasive plants within their non-native range has received increasingly more attention. Common gardens are typically used to assess the levels of genotypic ... [more ▼]

Population differentiation of alien invasive plants within their non-native range has received increasingly more attention. Common gardens are typically used to assess the levels of genotypic differentiation among populations. However, in such experiments, environmental maternal effects can influence phenotypic variation among individuals if seed sources are collected from field populations under variable environmental regimes. In the present study, we investigated the causes of an altitudinal cline in an invasive plant. Seeds were collected from Senecio inaequidens (Asteraceae) populations along an altitudinal gradient in southern France. In addition, seeds from the same populations were generated by intra-population crossings in a climatic chamber. The two seed lots were grown in a common garden in Central Belgium to identify any evidence of environmentally induced maternal effects and/or an altitudinal cline in a suite of life-history traits. Results failed to detect any environmental maternal effects. However, an altitudinal cline in plant height and above-ground biomass was found to be independent of the maternal environment. [less ▲]

Detailed reference viewed: 41 (10 ULg)
Full Text
Peer Reviewed
See detailDéficit de mémoire autobiographique chez des personnes souffrant de troubles bipolaires
Lejeune, Aurélie; Blairy, Sylvie ULg

in Revue Francophone de Clinique Comportementale et Cognitive (2009, March)

Detailed reference viewed: 162 (7 ULg)
Full Text
Peer Reviewed
See detailMeasurement of the magnetic field inside the holes of a drilled bulk high-Tc superconductor
Lousberg, Grégory ULg; Fagnard, Jean-François ULg; Noudem, Jacques G et al

in Superconductor Science and Technology (2009), 22

We use macroscopic holes drilled in a bulk YBCO superconductor to probe its magnetic properties in the volume of the sample. The sample is subjected to an AC magnetic flux with a density ranging from 30 ... [more ▼]

We use macroscopic holes drilled in a bulk YBCO superconductor to probe its magnetic properties in the volume of the sample. The sample is subjected to an AC magnetic flux with a density ranging from 30 to 130 mT and the flux in the superconductor is probed by miniature coils inserted in the holes. In a given hole, three different penetration regimes can be observed: (i) the shielded regime, where no magnetic flux threads the hole; (ii) the gradual penetration regime, where the waveform of the magnetic field has a clipped sine shape whose fundamental component scales with the applied field; and (iii) the flux concentration regime, where the waveform of the magnetic field is nearly a sine wave, with an amplitude exceeding that of the applied field by up to a factor of two. The distribution of the penetration regimes in the holes is compared with that of the magnetic flux density at the top and bottom surfaces of the sample, and is interpreted with the help of optical polarized light micrographs of these surfaces. We show that the measurement of the magnetic field inside the holes can be used as a local characterization of the bulk magnetic properties of the sample. [less ▲]

Detailed reference viewed: 121 (82 ULg)
Full Text
Peer Reviewed
See detailSpecific language impairment as systemic developmental disorders
Parisse, Christophe; Maillart, Christelle ULg

in Journal of Neurolinguistics (2009), 22(2), 109-122

Specific Language Impairment (SLI) is a disorder characterised by slow, abnormal language development. Most children with this disorder do not present any other cognitive or neurological deficits. There ... [more ▼]

Specific Language Impairment (SLI) is a disorder characterised by slow, abnormal language development. Most children with this disorder do not present any other cognitive or neurological deficits. There are many different pathological developmental profiles and switches from one profile to another often occur. An alternative would be to consider SLI as a generic name covering three developmental language disorders: developmental verbal dyspraxia, linguistic dysphasia, and pragmatic language impairment. The underlying cause of SLI is unknown and the numerous studies on the subject suggest that there is no single cause. We suggest that SLI is the result of an abnormal development of the language system, occurring when more than one part of the system fails, thus blocking the system’s natural compensation mechanisms. Since compensation also hinders linguistic evaluation, one possibility for diagnosis and remediation control is to assess basic cognitive abilities by non-linguistic means whenever possible. Neurological plausible bases for language and language development should also be taken into account to offer new hypotheses and research issues for future work on SLI. [less ▲]

Detailed reference viewed: 333 (27 ULg)
Full Text
Peer Reviewed
See detailRedshifts and lens profile for the double quasar QJ 0158-4325
Faure, C.; Anguita, T.; Eigenbrod, A. et al

in Astronomy and Astrophysics (2009), 496(2), 361-364

Aims. We report on the redshift of the lensing galaxy and of the quasar QJ 0158-4325 and on the lens model of the system. Methods. A deep VLT/FORS2 spectrum and HST/NICMOS-F160W images are deconvolved ... [more ▼]

Aims. We report on the redshift of the lensing galaxy and of the quasar QJ 0158-4325 and on the lens model of the system. Methods. A deep VLT/FORS2 spectrum and HST/NICMOS-F160W images are deconvolved. From the images we derive the light profile of the lensing galaxy and an accurate relative astrometry for the system. In addition we measure the flux ratio between the quasar images in the Mg II emission line to constrain the mass model. Results. From the spectrum we measure the redshift of the lensing galaxy (z = 0.317 +/- 0.001) and of the quasar (z = 1.294 +/- 0.008). Using the flux ratio in the lens model allows us to discard the SIE as a suitable approximation of the lens potential. On the contrary the truncated-PIEMD gives a good fit to the lens and leads to a time delay of Delta t(A-B) = -14.5 +/- 0.1 days, with H-0 = 73 km s(-1) Mpc(-1). Conclusions. Using the flux ratio to constrain the mass model favors the truncated-PIEMD over the SIE, while ignoring this constraint leaves the choice open. [less ▲]

Detailed reference viewed: 37 (4 ULg)
Full Text
See detailPreparation of multilayered chitosan-based nanofibers by combination of electrospinning and layer-by-layer deposition techniques
Croisier, Florence ULg; Aqil, Abdelhafid ULg; Detrembleur, Christophe ULg et al

Poster (2009, March)

By combining electrospinning technique and layer-by-layer deposition, we produced a new material made of multilayered, chitosan-based nanofibers. Layer-by-layer (LBL) is a well known method for surface ... [more ▼]

By combining electrospinning technique and layer-by-layer deposition, we produced a new material made of multilayered, chitosan-based nanofibers. Layer-by-layer (LBL) is a well known method for surface coating, based on electrostatic interactions. It enables the controllable deposition of a variety of polyions including synthetic and natural materials, with designable layer structure, defined wall thickness and size. Electrospinning (ESP) technique allows the fabrication of polymer fibers ranging from nanometers to a few microns in diameter, depending on the polymer characteristics (a.o. molecular weight, solution viscosity and conductivity) and processing conditions (electric potential, distance between syringe-capillary and collection plate, concentration, flow rate) (3). Mats of nanofibers produced by ESP display a very large surface area-to-volume ratio and high porosity with very small pore size. The nanometric scale of electrospun fibers also proves a positive effect on cellular growth, as fibers mats mimic extracellular matrix structure. The association of these two techniques with the use of biocompatible and biodegradable polymers such as chitosan, gives outstanding prospects in the field of biomedical applications, especially for the preparation of wound dressings, artificial skin or tissue engineering scaffolds. In the present study, a charged copolymer, poly(methylmethacrylate-block-methacrylic acid), was added to a poly(ε-caprolactone) or poly(D,L-lactide) solution before electrospinning in order to obtain charges on fibers surface. Oppositely charged polyelectrolytes – chitosan and poly(styrene sulfonate) or hyaluronic acid – were then alternately deposited on these aliphatic polyester fiber “cores” using LBL method. The aliphatic polyester core was also removed selectively to confirm the existence of a multilayered shell, obtaining hollow fibers. [less ▲]

Detailed reference viewed: 180 (17 ULg)
Full Text
See detailAre Education Professionals always vectors of solidarity-based social protection systems?
Poncelet, Marc ULg; Vögeli, Olivier; Thiry, Bernard et al

Report (2009)

Teachers are a ‘homogeneous’ socioprofessional category, which is organised and open to involvement and the promotion of a shared interest. They are an essential component of civil society on the edge or ... [more ▼]

Teachers are a ‘homogeneous’ socioprofessional category, which is organised and open to involvement and the promotion of a shared interest. They are an essential component of civil society on the edge or at the heart of the public sector. Whether or not they are integrated into the public sector, they share values: promotion of individuals, the emancipation and elevation of individuals, and social well-being. All of these elements are aspects which make teachers naturally open to mutual solidarity. They can fully assess the advantage of the mutual organisation as a complementary element to government social action or as a substitute for failing public authorities. They can ‘incarnate’ solidarity and reconstruct social links [less ▲]

Detailed reference viewed: 29 (8 ULg)
Full Text
See detailwhite matter damage in perinatal brain
Battisti, Oreste ULg

Learning material (2009)

this presentation makes the point on the pathophysiology concerning the white matter damage in the newborn infant

Detailed reference viewed: 23 (6 ULg)
Full Text
Peer Reviewed
See detailDéficit de mémoire autobiographique chez des patients Etat-limite
Smets, Virginie; Blairy, Sylvie ULg

in Revue Francophone de Clinique Comportementale et Cognitive (2009, March)

Detailed reference viewed: 99 (13 ULg)
Full Text
See detailL’impact des prises d’eau industrielles et des turbinages hydroélectriques sur la dynamique des populations de poissons et la qualité de leur habitat dans les cours d’eau navigables. Le cas de la Meuse et de l’Ourthe en Wallonie.
Philippart, Jean-Claude ULg; Ovidio, Michaël ULg

Scientific conference (2009, March)

La dynamique des populations de poissons, c’est-à-dire la variation dans le temps et l’espace de leur abondance, est la résultante de trois processus écologiques fondamentaux : i) l’apport de nouveaux ... [more ▼]

La dynamique des populations de poissons, c’est-à-dire la variation dans le temps et l’espace de leur abondance, est la résultante de trois processus écologiques fondamentaux : i) l’apport de nouveaux jeunes (recrutement) grâce à la reproduction naturelle (parfois renforcée ou compensée par des repeuplements en poissons d’élevage), ii) la perte d’individus à tous les stades de développement à cause des différents facteurs de mortalité (mauvaise qualité de l’eau, actions mécaniques, maladies et parasites, prédation, pêche) et iii) les phénomènes d’émigration-immigration qui mettent en jeu des migrations, particulièrement importantes chez les poissons amphihalins anadromes comme les salmonidés (saumon et truite de mer, lamproies de rivière et de mer) et catadromes commel’anguille européenne dans nos régions. Au cours de leurs migrations vers l’aval, les poissons sont confrontés à une forme de pression anthropique, les prises d’eau de tous types, qui peut provoquer des pertes démographiques importantes lorsque les ouvrages dérivent de grands volumes d’eau comme c’est le cas avec les prises d’eau de refroidissement des centrales électriques thermiques classiques et nucléaires et les grandes centrales hydroélectriques au fil de l’eau qui existent sur la Meuse et le cours inférieur de ses affluents navigables (Ourthe, Sambre). Ces mortalités résultent du placage des poissons entraînés sur les dispositifs de filtration de l’eau à l’entrée des installations (tambours filtrants et/ou grilles à barreaux) ou de leur passage forcé dans des turbines hydroélectriques de divers types, grandeurs et vitesses de rotation. L’exposé présente un aperçu des connaissances actuelles sur l’importance quantitative et le degré de gravité écologique des mortalités causées par les prises d’eau industrielles et les turbines hydroélectriques sur les populations de poissons de Wallonie, en accordant une attention particulière aux smolts du saumon atlantique et de la truite de mer et aux anguilles argentées sub-adultes. L’ analyse est complétée par un bref inventaire des moyens disponibles et à développer pour tenter de réduire les mortalités mécaniques des poissons migrateurs au niveau des ouvrages anciens en place et surtout des nouveaux ouvrages, spécialement les centrales hydroélectriques, en construction ou programmés. [less ▲]

Detailed reference viewed: 161 (33 ULg)