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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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

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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)

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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 ▲]

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See detailEffects of desert dust on air quality and human health. What do we know about West Africa compared to other regions?
De Longueville, Florence ULg; Henry, Sabine; Ozer, Pierre ULg

Conference (2009, February 24)

The main source of atmospheric mineral dust is the Sahara and its desertified margins that produce about half of the yearly global mineral dust. Saharan dust is often transported far away to the sources ... [more ▼]

The main source of atmospheric mineral dust is the Sahara and its desertified margins that produce about half of the yearly global mineral dust. Saharan dust is often transported far away to the sources and causes air quality deterioration impacting northwards the Mediterranean and Europe, westwards crossing the Atlantic Ocean to the United States, the Caribbean and South America, and southwards to the Gulf of Guinea. Saharan dust storms can lead to particulate levels that exceed internationally recommended levels and transport allergens, including bacteria and fungi. Therefore special attention is paid to dust storms as such mineral particulate matter air pollution may be a serious health threat in various regions of the world because it may promote respiratory infection, cardiovascular disease and other ailments. [less ▲]

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See detailCroisées de la science et du roman au tournant des Lumières
Stienon, Valérie ULg

in COnTEXTES : Revue de Sociologie de la Littérature (2009)

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See detailExtreme coronagraphy with an adaptive hologram
Ricci, Davide ULg

Scientific conference (2009, February 19)

We present a solution to improve the performances of coronagraphs in general for the detection of exo-planets. We simulate several kinds of coronagraphic systems using an IDL software, with the aim of ... [more ▼]

We present a solution to improve the performances of coronagraphs in general for the detection of exo-planets. We simulate several kinds of coronagraphic systems using an IDL software, with the aim of evaluating the gain obtained using an adaptive hologram. The detection limit in flux ratio between a star and a planet observed with an apodized Lyot coronagraph characterized by wavefront bumpiness imperfections of lambda/20 (resp. lambda /100) turns out to be increased by a factor 1`000 (resp. 1`000`000) when equipped with an hologram. This technique could provide a direct imaging of an exo-earth at a distance of 11 parsec with a space telescope with a mirror quality analog to the HST, and with a diameter analog to the JWST. [less ▲]

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See detailPresent status of the ILMT hardware
Finet, François ULg

Scientific conference (2009, February 19)

The aim of this presentation is to introduce the International Liquid Mirror Telescope (ILMT) project and to establish the latest advances in its hardware development. The presentation will begin with a ... [more ▼]

The aim of this presentation is to introduce the International Liquid Mirror Telescope (ILMT) project and to establish the latest advances in its hardware development. The presentation will begin with a brief introduction on the basics of liquid mirrors. The elements required to complete the mirror in order to get a functional liquid mirror telescope will then be reviewed. The particularities of Liquid Mirror Telescopes will then be discussed and the advantages they represent for specific scientific objectives will be explained. In particular, the ILMT scientific drivers will be presented. Once the project and its scientific interest will have been introduced, we will talk about the current status of the ILMT hardware: the status of the container, the mechanical structure, the optical corrector and the CCD camera will be briefly summarized. The recent evolution will be emphasized. Finally, we will address what still needs to be done in the ILMT development. [less ▲]

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See detailLutte contre les maladies: les résultats des essais "protection fongicide" réalisés sur escourgeon sur le site de Lonzée en 2008
Monfort, bruno; Bodson, Bernard ULg

in Livre Blanc: Céréales - Gembloux (2009, February 18)

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See detailOrges brassicoles
Monfort, bruno; Bodson, Bernard ULg

in Livre Blanc: Céréales - Gembloux (2009, February 18)

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See detailLes régulateurs de croissance
Vancutsem, Françoise ULg; Seutin, Benoit ULg; Monfort, Bruno et al

in Livre Blanc: Céréales - Gembloux (2009, February 18)

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See detailLivre Blanc Céréales - Gembloux
De Proft, Michel; Bodson, Bernard ULg

Book published by Gembloux Agro-Bio Tech - Edition février 2009 (2009)

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See detailImplantation des cultures
Bodson, Bernard ULg; Roisin, Christian; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux (2009, February 18)

Expérimentations, résultats, perspectives, recommandations pratiques (date de semis, préparation du sol, profondeur de semis, densité de semis, protection des semis)

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