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See detailModelling error of a hydrodynamic model of the Mediterranean Sea
Vandenbulcke, Luc ULg; Rixen, M.; Beckers, Jean-Marie ULg et al

Conference (2009)

Detailed reference viewed: 15 (2 ULg)
Peer Reviewed
See detailDo spiders capture attention in a bottom-up fashion and does fear have an impact?
Devue, Christel ULg; Belopolsky, Artem; Theeuwes, Jan

Conference (2009)

Fear-related stimuli (e.g. spiders) seem to be prioritized during visual selection when they are actively searched for. This is especially true if the observers fear them. It remains unclear whether such ... [more ▼]

Fear-related stimuli (e.g. spiders) seem to be prioritized during visual selection when they are actively searched for. This is especially true if the observers fear them. It remains unclear whether such stimuli capture attention automatically when they are task-irrelevant. To answer that question, we used the additional singleton paradigm (Theeuwes, 1992) in which participants searched for a shape singleton (a circle among diamonds) while a fear-related stimulus (a spider) or a fear-unrelated stimulus (a butterfly) was also present in the display. To assess whether fear affects the extent of a possible bottom-up capture, we compared performance of participants that scored high or low on the Fear of Spiders Questionnaire (Szymanski & O'Donohue, 1995). Results showed that both types of task-irrelevant animals captured covert attention. Importantly, both types of animals produced larger interference in high-fear than in low-fear participants. This study suggests that fear as an individual characteristic influences bottom-up capture. [less ▲]

Detailed reference viewed: 25 (8 ULg)
See detailThermal manipulations of broiler embryos during late incubation and their immediate and long-lasting effects
Willemsen, H.; Everaert, Nadia ULg; Tona, K. et al

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailRythmes biologiques et comportement animal.
Poncin, Pascal ULg

Conference (2009)

Detailed reference viewed: 16 (3 ULg)
Peer Reviewed
See detailEvolution of Saturn's Bright Polar Aurora
Stallard, T.; Grodent, Denis ULg; Badman, S. V. et al

Conference (2009)

Observations of Saturn's infrared aurorae have shown that in addition to the main auroral oval, which is believed to be associated with the solar wind, there are significant polar emissions. Ground-based ... [more ▼]

Observations of Saturn's infrared aurorae have shown that in addition to the main auroral oval, which is believed to be associated with the solar wind, there are significant polar emissions. Ground-based infrared observations of Saturn have been able to show that there is a general level of raised emission across the entire polar region, in a similar way to that seen at Jupiter. However, with direct observations of the aurora made from orbit around Saturn by the Cassini-VIMS instrument, this aurora was shown to be more than a relative generalised brightening in the infrared. Instead, a unique auroral feature was observed to occur, appearing as a large region of bright polar emission, positioned poleward of 82 degrees latitude. This Bright Polar Aurora emission is significantly different from the recently observed subrotating Q-branch auroral emission seen in both the ultraviolet and infrared, as it is separated from the main auroral oval by a region of low emission. This effectively produces a cap of bright aurora inside the main auroral oval, surrounded by a dark ring that separates the two aurorae. Here, we take a more detailed look at this cap of emission and examine the way the auroral feature develops with time. Bright Polar Aurora emission has been observed in two separate VIMS images. A more detailed analysis of the polar emission shows that each of these images in fact differs in structure; the first has auroral emission across the whole polar cap >82 degrees, but within the second the emission is concentrated on the dusk side. While the dramatic in-filling of the polar cap is not seen within any UV observations, the Hubble Space Telescope has observed transitory duskward auroral features within the polar cap, in a similar location to the duskward feature seen in the infrared. Using ground-based infrared observations, which allow a Bright Polar Aurora event to be broken into shorter timescale steps, it is possible analyse the progression of the infrared auroral emission with time, connecting the morphology seen within the two VIMS images with those in the ultraviolet. [less ▲]

Detailed reference viewed: 9 (0 ULg)
See detailTransformation identitaires en cours de formation initiale des enseignants: axes d'une grille de réflexivité sur le métier
Dejean, Karine ULg

Conference (2009)

Cette communication porte sur l’analyse des transformations identitaires exprimées dans les discours des enseignants en formation initiale. Cette analyse nous a permis de dégager des axes de ... [more ▼]

Cette communication porte sur l’analyse des transformations identitaires exprimées dans les discours des enseignants en formation initiale. Cette analyse nous a permis de dégager des axes de transformation qui pourront servir d’outils dans le cadre de séances de réflexivité collective et individuelle avec les futurs enseignants en leur offrant des éléments d’intelligibilité pour les aider à se situer par rapport à leur propre parcours de développement et par rapport aux différentes attentes institutionnelles à leur égard. [less ▲]

Detailed reference viewed: 17 (1 ULg)
See detailInferring causal relationships using information-theoretic measures
Olsen, Catharina; Meyer, Patrick ULg; Bontempi, Gianluca

Conference (2009)

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailBody dermatitis in a donkey caused by the Psoroptes ovis
Mignon, Bernard ULg; Lekimme, Mireille ULg; Huynen, K. et al

Conference (2009)

Detailed reference viewed: 53 (10 ULg)
See detailThe Quiet HMXB Candidates HD 14633 and HD 15137
McSwain, M. V.; Roberts, M. S. E.; Boyajian, T. S. et al

Conference (2009)

The runaway O-type binaries HD 14633 and HD 15137 were likely ejected from the cluster of their birth by supernovae explosions in close binaries. Neither star is a known X-ray source, but they likely ... [more ▼]

The runaway O-type binaries HD 14633 and HD 15137 were likely ejected from the cluster of their birth by supernovae explosions in close binaries. Neither star is a known X-ray source, but they likely contain neutron stars and may be weak stellar wind accretion systems. Hence the two binaries have been classified as "quiet HMXBs". Here we present new optical spectra of these spectroscopic binaries and reassess their orbits. We also present preliminary results from recent XMM-Newton observations, intended to detect the hard power-law spectrum from accreting or quiescent neutron star companions and reveal the evolutionary history of these intriguing runaways. [less ▲]

Detailed reference viewed: 8 (0 ULg)
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See detailA coupled two-scale computational approach for quasi-brittle out-of-plane structural failure
Mercatoris, Benoît ULg; Massart, Thierry J.

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
See detailTerritory knowledge (B1pc) - Discussion report
Breuer, Christophe ULg

Conference (2009)

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailNon-native variëteiten van het Nederlands: verwerving en didactiek
Rasier, Laurent ULg

Conference (2009)

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailHyperfine Structure and Isotope Shifts in Iron Atoms
Krins, Stéphanie ULg; Oppel, S.; Huet, Nicolas ULg et al

Conference (2009)

Detailed reference viewed: 26 (4 ULg)
Peer Reviewed
See detailQuantum Entanglement Antibunching and Saturation of Atoms in Dipole Blockade
Gillet, Jérémie ULg; Agarwal, G. S.; Bastin, Thierry ULg

Conference (2009)

Detailed reference viewed: 6 (2 ULg)
See detailNarrative roles of the particle isT
Gillen, Todd Jonathan ULg

Conference (2009)

Detailed reference viewed: 6 (0 ULg)
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Peer Reviewed
See detailA coupled two-scale computational approach for quasi-brittle out-of-plane structural failure
Mercatoris, Benoît ULg; Massart, Thierry J.

Conference (2009)

Detailed reference viewed: 11 (0 ULg)
See detailIono slab monitoring service
Stankov, Stanimir; Warnant, René ULg; Stegen, Koen

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailCodes, chartes et labels de qualité : conséquences juridiques pour les entrepreneurs
Kohl, Benoît ULg

Conference (2008, December 19)

Detailed reference viewed: 23 (1 ULg)
See detailLa déontologie de l'information
Vanesse, Marc ULg

Conference (2008, December 18)

Journée de réflexion sur la déontologie de l'information avec plusieurs intervenants : un avocat pénaliste, le secrétaire général adjoint de l'Association des journalistes de Belgique, l'auteur d'une ... [more ▼]

Journée de réflexion sur la déontologie de l'information avec plusieurs intervenants : un avocat pénaliste, le secrétaire général adjoint de l'Association des journalistes de Belgique, l'auteur d'une recherche sur la caméra cachée, un journaliste d'investigation. [less ▲]

Detailed reference viewed: 22 (5 ULg)
See detailIntroduction to Fiscal Federalism in Belgium
Bourgeois, Marc ULg

Conference (2008, December 18)

Detailed reference viewed: 40 (3 ULg)
Peer Reviewed
See detailÀ l’Hôtel des Étrangers, repaire d’une bohème zutique
Saint-Amand, Denis ULg

Conference (2008, December 12)

Detailed reference viewed: 66 (4 ULg)
See detailLes mutations récentes du champ éditorial belge
Habrand, Tanguy ULg

Conference (2008, December 12)

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailÀ propos d’épiclèses « trans-divines » : le cas de Zeus et d’Athéna à Cos
Paul, Stéphanie ULg

Conference (2008, December 12)

Dans l’île de Cos, Zeus et Athéna sont honorés sous cinq épiclèses différentes : Polieus/Polias, Machaneus/Machanis, Alseios/Alseia, Phatrios/Phatria et Sôter/Sôteira. L’article présente une étude des ... [more ▼]

Dans l’île de Cos, Zeus et Athéna sont honorés sous cinq épiclèses différentes : Polieus/Polias, Machaneus/Machanis, Alseios/Alseia, Phatrios/Phatria et Sôter/Sôteira. L’article présente une étude des sources épigraphiques qui nous renseignent sur ces cultes, afin de proposer une interprétation de la manière dont fonctionnent ces différentes paires de divinités au sein du panthéon de la cité. Parmi celles-ci, le culte de Zeus Polieus et d’Athéna Polias fera l’objet d’une étude particulière, car il semble y occuper une place centrale. Ce sera également l’occasion de replacer ces cultes dans le contexte historique de la cité, qui a connu un synécisme, de mettre en parallèle le cas de Cos avec ceux de Rhodes et Athènes, et de poser diverses questions qui y sont liées, comme par exemple celle des divinités « poliades ». [less ▲]

Detailed reference viewed: 26 (3 ULg)
See detailTesi Samanunga : La littérature en langue thioise dans la Principauté de Liège
Vromans, Joseph ULg

Conference (2008, December 12)

Detailed reference viewed: 36 (1 ULg)
See detailImmuno PCR : a new tool for the ultra-sensitive detection of biomolecules
Zorzi, Willy ULg; Elmoualij, Benaïssa ULg

Conference (2008, December 11)

Detailed reference viewed: 5 (0 ULg)
See detailDas Leben der Anderen
Hamers, Jérémy ULg

Conference (2008, December 11)

Detailed reference viewed: 21 (0 ULg)
See detailCommunication, médiation, vulgarisation
Servais, Christine ULg

Conference (2008, December 11)

Detailed reference viewed: 50 (11 ULg)
See detailInvisible Computer for Design Activities
Safin, Stéphane ULg

Conference (2008, December 11)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailApproche physiopathologique du nouveau-né et de l'enfant en soins intensifs
Battisti, Oreste ULg

Conference (2008, December 10)

Detailed reference viewed: 44 (9 ULg)
See detailParliamentary TA Institutions as Indications of Reflexive Modernization
Delvenne, Pierre ULg

Conference (2008, December 10)

Detailed reference viewed: 8 (0 ULg)
See detailPoint de vue de la SBAR
Brichant, Jean-François ULg

Conference (2008, December 06)

Detailed reference viewed: 10 (0 ULg)
See detailInsuffisance rénale chronique : "Epidemiology of CVRF"
Krzesinski, Jean-Marie ULg

Conference (2008, December 05)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailLes stratégies juridiques des entreprises en Europe
Petit, Nicolas ULg

Conference (2008, December 05)

Detailed reference viewed: 10 (2 ULg)
Peer Reviewed
See detailLa base de données du CIEL
Dozo, Björn-Olav ULg; Vanderpelen, Cécile

Conference (2008, December 04)

Detailed reference viewed: 7 (1 ULg)
See detailLe management cohérent de l'entreprise coopérative
Mertens de Wilmars, Sybille ULg

Conference (2008, December 04)

Detailed reference viewed: 14 (3 ULg)
See detailTiO2 mesoporous thin films acting as photoelectrode in dye-sensitized solar cells
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Henrist, Catherine ULg

Conference (2008, December 03)

This study aims at developing thin films of nanocrystalline, mesostructured titanium dioxide in order to build low cost and efficient photovoltaic devices. The synthesis is based on the Evaporation ... [more ▼]

This study aims at developing thin films of nanocrystalline, mesostructured titanium dioxide in order to build low cost and efficient photovoltaic devices. The synthesis is based on the Evaporation Induced-Self Assembly method using titanium isopropoxide as inorganic source, block copolymers as structuring and porogeneous agents and ethanol as solvent. The films were obtained by dip-coating various substrates in the solution. The influence of different experimental parameters, such as dip-coating and ageing relative humidity, withdrawal speed, surfactant:Ti ratio, substrate, was studied. The post-deposition thermal treatment had to be accurately adjusted in order to maximise the crystallisation of the inorganic network while avoiding the collapse of the porous mesostructure. The final structure obtained is discussed in the light of the XRD results combined with TEM analysis. Moreover the cell performance is limited by the film thickness which is mainly responsible of the small amount of absorbed light. Therefore a multilayer deposition process was studied and the as-obtained mesostructure was characterized by TEM, RBS and environmental ellipsometry. [less ▲]

Detailed reference viewed: 19 (3 ULg)
See detailHypertension artérielle et alimentation
Krzesinski, Jean-Marie ULg

Conference (2008, December 02)

Detailed reference viewed: 9 (3 ULg)
See detailThe variation of different components of Jupiter's auroral emission
Nichols, J.; Clarke, J.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

In this paper we use the extensive HST data set obtained over two month-long campaigns in 2007 to determine the long term variability of the different components of Jupiter's auroras. We define three ... [more ▼]

In this paper we use the extensive HST data set obtained over two month-long campaigns in 2007 to determine the long term variability of the different components of Jupiter's auroras. We define three regions on the planet's disc, i.e. the main oval, the low latitude, and high latitude auroras, and extract the UV auroral power emitted therefrom. The high latitude region was also further divided into the polar inner and polar outer regions. We discuss the temporal variation of these parameters with reference to the auroral morphology and estimated solar wind conditions projected to Jupiter's orbit from data obtained at Earth orbit. We show that the auroral morphology was very different between the first and second campaigns. In the first campaign the emitted power originated mainly from the main oval and the high latitude regions, which roughly correlated, and exhibited enhancements that are suggested to be associated with compression regions. In the second campaign the high latitude and main oval auroras were generally dimmer overall and less variable, while the low latitude region was populated with bright, patchy emission. We show that a particular auroral morphology is probably associated specifically with compression regions, i.e. over longitudes greater than approx. 180 degrees the main oval is bright and located approx. 1 degree poleward of its previous location, while over smaller longitudes the main oval is not bright or well defined. Instead there is bright emission originating from the contiguous poleward region in the afternoon/dusk sector where bright, sometimes multiple arcs form. It remains unclear, however, whether this state is a response to the initial shock or some other event within the rapidly-varying compression regions. We also show that the dawn storm events, typically associated with intense dawn side main oval auroras also result in the brightening of the high latitude auroras, even to the very highest latitude components, which presumably map to a very different region of the magnetosphere. However, apart from the dawn storms and bright poleward arcs in the afternoon/dusk sector, the power emitted from the poleward auroras is generally uncorrelated with that of the main oval. [less ▲]

Detailed reference viewed: 23 (2 ULg)
See detailRecent results from HST and ground-based observations of Saturn's aurora
Grodent, Denis ULg; Stallard, T.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

Current observations of Saturn's aurora performed from Earth-orbit with HST and ground based instruments more than complement the in situ measurements obtained by the Cassini spacecraft. These remote ... [more ▼]

Current observations of Saturn's aurora performed from Earth-orbit with HST and ground based instruments more than complement the in situ measurements obtained by the Cassini spacecraft. These remote observations focus on two spectral windows revealing different facets of the same auroral phenomenon. The auroral photons captured in the ultraviolet bandwidth result from direct impact excitation of H and H2 by charged particles accelerated along magnetic field lines, while the thermal infrared emission involves additional steps in order to produce hot H3+ from the auroral energy. Each spectral window presents its own advantages. The high spatial and temporal resolution of the recent UV images obtained with HST make it possible to discriminate auroral sub-structures, such as short lived arcs and spots, and to map them into the magnetosphere where they can be associated with in situ observations. Infrared high resolution spectroscopy and emission-line imaging from ground observatories (IRTF, UKIRT) have more modest spatial resolution; however they recently pinned down emissions barely observed in the UV. Furthermore, they offer a direct measurement of the ion wind velocities in the auroral ionosphere. These ion flow patterns might then be used to untangle the origin of the auroral particles. The complementarity of observations obtained in the UV and IR bandwidths provides a powerful tool to study the auroral mechanisms in the Kronian magnetosphere and the atmospheric response to the auroral input. [less ▲]

Detailed reference viewed: 17 (7 ULg)
Peer Reviewed
See detailIntérêt de l'évaluation de l'efficacité d'une prise en charge
Adam, Stéphane ULg

Conference (2008, December 01)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailNeutral Ion Coupling Explorer satellite measurements of thermospheric composition, winds and temperatures.
Mende, S. B.; Immel, T. J.; England, S. et al

Conference (2008, December 01)

A new Small Explorer mission, the Neutral Ion Coupling Explorer (NICE) mission, was selected for study by NASA to specifically address neutral ion coupling in the Earth's atmosphere. The main goal of NICE ... [more ▼]

A new Small Explorer mission, the Neutral Ion Coupling Explorer (NICE) mission, was selected for study by NASA to specifically address neutral ion coupling in the Earth's atmosphere. The main goal of NICE is to study neutral-ion coupling at low latitudes where the densest plasma in geospace is created and where a number of remarkable interactions between the plasma and neutral gas occur even in the relative absence of high-latitude forcing. NICE will study this region from a ~24 degree inclination 550 km circular orbit, residing entirely on closed magnetic field lines. The relatively fast precession of low-inclination orbit is favorable for frequent sampling of all local times for the determination of tidal structures. It is now widely recognized that the neutral thermosphere has a strong influence on the ionosphere and that Earth's ionosphere at quiet times is actually tidally dominated. The NICE concept is unique in simultaneously providing measurements of the parameters relevant to ion production and motion across the entire altitude range of the low-latitude ionosphere. The science payload consists of 3 remote sensing instruments viewing the atmospheric limb (1) a dual Doppler Fabry-Perot Interferometer (FP), scanning in altitude to measure neutral wind vector and temperature altitude profiles in the E- and F-regions, (2) a Far Ultraviolet (FUV) imager to measure daytime neutral composition and image the nighttime F-layer intensity distributions, and (3) an Extreme Ultraviolet (EUV) altitude profiler to retrieve daytime F-layer properties. In addition, an Ion Velocity Meter (IVM) measures the in-situ ion drifts. NICE will take advantage of an elegant choice of orbit and instrument viewing geometries to make coordinated and complementary observations at all local times, with optimal conjunction of measurements occurring near the equator. The observations are accompanied by a suite of advanced numerical models and analysis techniques. [less ▲]

Detailed reference viewed: 80 (7 ULg)
See detailThe Ultraviolet Spectrograph (UVS) on Juno
Gladstone, G. R.; Persyn, S.; Eterno, J. et al

Conference (2008, December 01)

Juno, a NASA New Frontiers mission, plans for launch in August 2011, a 5-year cruise (including a flyby of Earth in October 2013 for a gravity boost), and 14 months around Jupiter after arriving in August ... [more ▼]

Juno, a NASA New Frontiers mission, plans for launch in August 2011, a 5-year cruise (including a flyby of Earth in October 2013 for a gravity boost), and 14 months around Jupiter after arriving in August 2016. The spinning (2 RPM), solar-powered Juno will study Jupiter from a highly elliptical orbit, in which the spacecraft (for about 6 hours once every 11 days) dives down over the north pole, skims the outermost atmosphere, and rises back up over the south pole. This orbit allows Juno avoid most of the intense particle radiation surrounding the planet and provides an excellent platform for investigating Jupiter's polar magnetosphere. Part of the exploration of Jupiter's polar magnetosphere will involve remote sensing of the far-ultraviolet H and H2 auroral emissions, plus gases such as methane and acetylene which add their absorption signature to the H2 emissions. This hydrocarbon absorption can be used to estimate the energy of the precipitating electrons; since more energetic electrons penetrate deeper into the atmosphere and the UV emissions they produce will show more absorption. Juno will carry an Ultraviolet Spectrograph (UVS) to make spectral images of Jupiter's aurora. UVS is a UV imaging spectrograph sensitive to both extreme and far ultraviolet emissions in the 70-205~nm range that will characterize the morphology and spectral nature of Jupiter's auroral emissions. Juno UVS consists of two separate sections: a dedicated telescope/spectrograph assembly and a vault electronics box. The telescope/spectrograph assembly contains a telescope which feeds a 0.15-m Rowland circle spectrograph. The telescope has an input aperture 40à 40~mm2 and uses an off-axis parabolic primary mirror. A flat scan mirror situated at the front end of the telescope (used to target specific auroral features at up to ±30° perpendicular to the Juno spin plane) directs incoming light to the primary. The light is then focused onto the spectrograph entrance slit, which has a 'dog- bone' shape 6° long, in three 2° sections of 0.2°, 0.05°, and 0.2° width (projected onto the sky). Light entering the slit is dispersed by a toroidal grating which focuses the UV bandpass onto a curved microchannel plate (MCP) cross delay line (XDL) detector with a solar blind UV- sensitive CsI photocathode, which makes up the instrument's focal plane. Tantalum shielding surrounds the detector assembly to protect the detector and the adjacent detector electronics from high-energy electrons. The main electronics box is located in the Juno vault. Inside are two redundant high-voltage power supplies (HVPS), two redundant low-voltage power supplies, the command and data handling (C&DH) electronics, heater/actuator activation electronics, scan mirror electronics, and event processing electronics. An overview of the UVS design and scientific performance will be presented. [less ▲]

Detailed reference viewed: 119 (8 ULg)
See detailThe Degree of Correlation of Jovian and Saturnian Auroral Emissions With Solar Wind Conditions
Clarke, J. T.; Nichols, J.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

While the terrestrial aurorae are known to be driven primarily by the interaction of the Earth's magnetosphere with the solar wind, auroral emissions on Jupiter and Saturn are thought to be driven ... [more ▼]

While the terrestrial aurorae are known to be driven primarily by the interaction of the Earth's magnetosphere with the solar wind, auroral emissions on Jupiter and Saturn are thought to be driven primarily by internal processes, with the main energy source being the planets' rapid rotation. Limited evidence has suggested there might be some influence of the solar wind on Jupiter's aurorae, and indicated that auroral storms on Saturn can occur at times of solar wind pressure increases. To investigate in detail the dependence of auroral processes on solar wind conditions, a large campaign of observations of these planets has been undertaken using the Hubble Space Telescope, in association with measurements from planetary spacecraft and solar wind conditions both propagated from one AU and measured near each planet. The data indicate a consistent brightening of both the auroral emissions and Saturn Kilometric Radiation (SKR) at Saturn close in time to the arrival of solar wind shocks and pressure increases, consistent with a direct physical relationship between Saturnian auroral processes and solar wind conditions. This correlation has been strengthened by the final campaign observations in Feb. 2008. At Jupiter the situation is less clear, with increases in total auroral power seen near the arrival of solar wind forward shocks, while little increase has been observed near reverse shocks. In addition, auroral dawn storms have been observed when there was little change in solar wind conditions. The data are consistent with some solar wind influence on some Jovian auroral processes, while the auroral activity also varies independently of the solar wind. This extensive data set will serve to constrain theoretical models for the interaction of the solar wind with the magnetospheres of Jupiter and Saturn. [less ▲]

Detailed reference viewed: 55 (8 ULg)
Peer Reviewed
See detailElaboration of Magnetic Nanodots by Nanosphere Lithography : a Computerized Method for Order Quantification
Colson, Pierre ULg; Cloots, Rudi ULg; Henrist, Catherine ULg

Conference (2008, December 01)

Nanosphere lithography (NSL) is an ideal inexpensive fabrication tool for producing regular, nearly homogenous arrays of nanoparticules with different sizes. There are many different methods for the ... [more ▼]

Nanosphere lithography (NSL) is an ideal inexpensive fabrication tool for producing regular, nearly homogenous arrays of nanoparticules with different sizes. There are many different methods for the fabrication of the latex monolayer based on electrophoresis, the controlled evaporation of a solvent from the suspension containing latex particles, spincoating etc… We focused our work on this last method. The main problem with formation of 2D latex monolayers is that there are always a high number of different structural defects such as: point defects (vacancies), line defects (dislocations) and also many disordered areas. The influence of the different spincoating parameters on the amount of defects was determined by image analysis of SEM micrographies from the different samples. FePt and Co films were deposited onto quartz substrates through the polystryrene monolayers by magnetron sputtering. The nanopsheres were removed by sonication in toluene. Post-deposition annealing treatment was performed under reductive atmosphere for the FePt nanodots in order to transform the as-deposited chemically disoredered face-centered cubic (fcc) structure into the chemically ordered face-centered tetragonal (fct) phase (L10-phase). DRX , SEM and MFM analysis were performed on the different samples. [less ▲]

Detailed reference viewed: 25 (2 ULg)
See detailLong-term Brightness Variations of the Io UV Footprint
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

Since the finding of the UV Io footprint in 1996, the successive UV instruments on board the Hubble Space Telescope (HST) allowed us to considerably improve the understanding of the Io-Jupiter electro ... [more ▼]

Since the finding of the UV Io footprint in 1996, the successive UV instruments on board the Hubble Space Telescope (HST) allowed us to considerably improve the understanding of the Io-Jupiter electro-magnetic interaction and its auroral counterpart. It has been shown that the Io footprint is generally formed by one bright spot preceded or followed by secondary spots whose relative positions are linked to the location of Io in the plasma torus. We also know that these spots experience brightness variations from minutes to hours. The Io footprint brightness varies over hours with the longitude of Io in the Jovian magnetic field (System III longitude) but until recently, huge gaps existed in the longitude coverage. Part of these gaps has now been filled during the latest HST imaging campaign and a more complete spot brightness versus Io System III longitude diagram emerges. Additionally, we compare spot brightness between images obtained a few minutes apart but from opposite hemispheres. Based on images gathered from 1997 to 2007 with the STIS and the ACS cameras, we also show that the footprint morphology and the spots brightness, including their relative brightness, can vary significantly from one year to another. Finally, we discuss the brightness variations from hours to years in terms of plasma torus density and position of Io in the plasma torus as well as in Jovian magnetic field. [less ▲]

Detailed reference viewed: 30 (5 ULg)
See detailSaturn Auroral Movies from Cassini UVIS
Pryor, W. R.; Stewart, I.; Esposito, L. et al

Conference (2008, December 01)

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed four years of study of Saturn's atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and ... [more ▼]

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed four years of study of Saturn's atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and FUV data from 111.5-191.3 nm. 64 spatial pixels along each slit are combined with slit motion to construct spectral images of Saturn. Auroral emissions are seen from electron-excited molecular and atomic hydrogen. In 2008 UVIS obtained data with the spacecraft well out of Saturn's ring plane, permitting UVIS to obtain a number of short movies of the rotating auroral structures. In some movies a cusp-like feature is present near noon inside the oval. One movie from 2008 day 201 shows parallel linear features on the day side almost at right angles to the main auroral oval that appear, then lengthen, separate in the middle, and then fade away. The same movie also shows one bright "polar flare" inside the oval. A few of the most recent images were obtained at sufficiently close range that 2 spacecraft slews were needed to completely cover the oval. These images provide almost 100 pixels of information across the oval and clearly show multiple arcs of emission on the main oval and scattered emissions inside the oval. We will discuss these features, their locations, and possible interpretations. [less ▲]

Detailed reference viewed: 47 (2 ULg)
See detailL'audit social. Evaluez les risques sociaux de votre entreprise !
Robert, Frédéric; Maréchal, Benoît ULg

Conference (2008, December 01)

This seminar introduce to the practice of the social audit with regard to compagnies. On basis of a list of social risks with regard to labour law and social security law, the Authors illustrated how ... [more ▼]

This seminar introduce to the practice of the social audit with regard to compagnies. On basis of a list of social risks with regard to labour law and social security law, the Authors illustrated how these risks could be examined and evaluated in the case of a social audit of the company. [less ▲]

Detailed reference viewed: 164 (4 ULg)
See detailCoordinated measurements of auroral processes at Saturn from the Cassini spacecraft and HST
Mitchell, D. G.; Kurth, William; Hospodarsky, G. B. et al

Conference (2008, December 01)

One of the primary Cassini mission objectives at Saturn is to characterize Saturn's aurora-its spatial morphology, associated particle energization, radio wave generation, and magnetospheric currents ... [more ▼]

One of the primary Cassini mission objectives at Saturn is to characterize Saturn's aurora-its spatial morphology, associated particle energization, radio wave generation, and magnetospheric currents, relationship with solar wind pressure and magnetic field, and its large scale mapping to the magnetosphere. By design, the Cassini orbital tour included high inclination and low periapsis orbits late in the prime mission specifically to address many of these topics. In this presentation, we will provide a snapshot of the current state of our investigation into the relationship between magnetospheric measurements of particles and fields, and the aurora. For in situ data, we will show measurements of upward traveling light ion conics (~30 keV to 200 keV), often accompanied by electron beams (<20 keV to ~1 MeV) and enhanced broadband noise (10 Hz to a few kHz), throughout the outer magnetosphere on field lines that nominally map from well into the polar cap (dipole L > 50) to well into the closed field region (dipole L < 10). Sometimes the particle phenomena and the broadband noise occur in pulses of roughly five-minute duration, separated by tens of minutes. At other times they are relatively steady over an hour or more. Magnetic signatures associated with some of the pulsed events are consistent with field aligned current structures. Correlative observations of solar wind (Cassini) and aurora (HST) have established a strong relationship between solar wind pressure and auroral activity (brightness) (Crary et al., Nature, 2005; Clarke et al., JGR, 2008). A similar correspondence between bright auroral arcs and ring current ion acceleration will be shown here. So while some auroral forms seem to be associated with the open/closed field boundary (i.e. in the cusp-Bunce et al., JGR, 2008), we also demonstrate that under some magnetospheric conditions for which protons and oxygen ions are accelerated once per Saturn magnetosphere rotation at a preferred local time between midnight and dawn, simultaneous auroral observations by the HST reveal a close correlation between these dynamical magnetospheric events and dawn-side transient auroral brightenings. Likewise, many of the recurrent energetic neutral atom enhancements coincide closely with bursts of Saturn kilometric radiation, again suggesting a linkage with high latitude auroral processes. Finally, we will show some intriguing results of auroral movie sequences from the Cassini UVIS instrument with corresponding ring current movies from the Magnetospheric Imaging Instrument Ion and Neutral Camera (MIMI/INCA). [less ▲]

Detailed reference viewed: 52 (6 ULg)
See detailEnjeux et conditions de l'enseignement des langues dans les universités
Defays, Jean-Marc ULg

Conference (2008, December)

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See detailLindane et goudron dans les shampoings: quelle toxicité ?
Theunis, Laetitia ULg

Conference (2008, December)

Detailed reference viewed: 16 (3 ULg)
See detailIsothermal titration calorimetry as a tool for improving enzymatic lignocellulose hydrolysis
Razafindralambo, Hary ULg; Boquel, Pascal; Jacquet, Nicolas ULg et al

Conference (2008, December)

Detailed reference viewed: 21 (9 ULg)
See detailDevelopment of products for GNSS users at the Belgian Solar-Terrestrial Centre of Excellence
Warnant, René ULg; Lejeune, Sandrine; Stankov, Stanimir et al

Conference (2008, December)

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See detailDesign of perfluorinated macroligand for the implementation of atom transfer radical polymerization in supercritical carbon dioxide
Grignard, Bruno ULg; Jérôme, Christine ULg; Calberg, Cédric ULg et al

Conference (2008, November 28)

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical ... [more ▼]

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical polymerization (CRP) in scCO2 has started to gain attention. Among all the controlled processes, Atom Transfer Radical Polymerization has emerged as a robust tool for the preparation of polymers with well-defined molecular weight, architecture and chain-end functionality. The goal of the research relies on the development of ATRP of vinyl monomers in scCO2. Perfluorinated polymethacrylate, i.e. poly2,2,2-trifluoroethyl methacrylate (PFMA), was successfully prepared by homogenous ATRP using a polymeric ligand in order to complex the copper catalyst. CO2-soluble poly(2,2,2-trifluoroethylmethacrylate) was also prepared in supercritical CO2 by supported ATRP using a “pseudo-homogeneous” catalyst consisting of copper (I) ligated by macroligand immobilized onto an inorganic support, that results in polymers with well defined molecular weight and low polydispersity. The first efficient dispersion ATRP of methyl methacrylate (MMA) in scCO2 using a fluorinated polymeric ligand that had a dual role, i.e., the complexation of the copper salt and the stabilization of PMMA growing particles was also reported and the concept of dispersion ATRP was extended to the dispersion ATRP of styrene, to the synthesis of diblock copolymers beads using PMMA beads as macroinitiators, leading to (co)polymers with predictable molecular weight and narrow polydispersity. Finally, because both ATRP and alkyne-azide Huisgen’s 1,3-dipolar cycloaddition relies on the use of a Cu(I) catalyst, synthesis of pyrene end-functionalized polymers by simultaneous dispersion ATRP and click reaction was also investigated in supercritical carbon dioxide, leading to the formation of PMMA of well defined characteristics that was collected as fluorescent micropheres. [less ▲]

Detailed reference viewed: 41 (6 ULg)
See detailDesign of thermoresponsive inorganic nanoparticles
Aqil, Abdelhafid ULg; Jérôme, Christine ULg

Conference (2008, November 28)

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See detailTowards Another Summer
Delrez, Marc ULg

Conference (2008, November 28)

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See detailStimuli responsive nanogels for targeted drug delivery
Jérôme, Christine ULg

Conference (2008, November 28)

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See detailSummary of aim and achievements in Work Package 7 "Functional Coatings"
Jérôme, Christine ULg

Conference (2008, November 28)

Detailed reference viewed: 10 (2 ULg)
See detailA Lilliputian lignophyte from the Lower Devonian?
Gerrienne, Philippe ULg; Strullu-Derrien, C.; Steemans, Philippe ULg

Conference (2008, November 27)

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See detailLa figure de la femme dans les opéras de Wolfgang Amadeus Mozart (1756-1791) et de Giuseppe Verdi (1813-1901)
Corswarem, Emilie ULg; Onkelinx, Jean-Marc

Conference (2008, November 26)

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See detailL’enfance comme champ d’intervention politique au Burkina Faso
Wouango, Joséphine ULg

Conference (2008, November 21)

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Peer Reviewed
See detailNon rigid stabilization of the spine.
Martin, Didier ULg

Conference (2008, November 21)

Detailed reference viewed: 2 (1 ULg)
Peer Reviewed
See detailVenture Creation Intentions and Midlife Crisis
Heuer, Annamaria ULg; Surlemont, Bernard ULg

Conference (2008, November 21)

Aim of the paper This paper aims to analyse the relationship between life stages and the drivers of venture creation intention and, hence, the venture creation. The objective is to analyse the extent to ... [more ▼]

Aim of the paper This paper aims to analyse the relationship between life stages and the drivers of venture creation intention and, hence, the venture creation. The objective is to analyse the extent to which the single-minded focus of most policy measures on early adult population to spur intention is not understating the importance of adapting the approach to specific life stages of the target population. Using different conceptualisations of age biological, psychological, organisational and life span related , we will take here a closer look at the midlife age cluster, centred around the 35th year. Contribution to the literature Numerous studies have applied models based on cognition research to understand entrepreneurial intentions and the factors that impact them (e.g. Autio et al., 2001; Kolvereid, 1996; Krueger, Reilly and Carsrud, 2000; Kristiansen and Indarti, 2004). However, besides a few exceptions, such as Douglas and Shepherd (2002) or Davidsson (1995), most scholars have conducted their studies on university students, due to their advantages as sample, like easier information access and homogeneity of population. Not much attention has been paid to the potential influence of the life-stage factor and its potential impact on policy formulation. Taking a chronological age perspective, Levinson (1986) proposed that there is an “underlying order in human life course”, no matter what occupation or background people have. He conceived life as a sequence of eras, each of them with a specific biopsychosocial character and each of them contributing to the whole life cycle. Major changes of life characteristics occur in the cross-era transition, but also within a life stage. According to this approach, every life stage has tasks to be accomplished (Levinson et al., 1978). From an entrepreneurship perspective, it is especially interesting to introduce this model by taking a closer look at stages of “Early adulthood” (age c. 20-40). “Early adult transition” (age c. 17-22) for instance is characterised by reflections about one’s own place in the world independent from the institutions of youth (parents, school…). It is also about testing one’s initial choices about preferences for the adult life. This is in line with the “impressionable years” hypothesis, which is based on the notion that key attitudes, beliefs, and values are of great plasticity during the early adult years (Sears, 1975; Visser et al., 1998), while suggesting that susceptibility to change in attitude falls sharply after early adult years and stays on a low level for the rest of the life cycle. These attitudes, beliefs and values build an essential pillar of intentions, and are thus relevant for the study of entrepreneurial intentions. A vast quantity of policies trying to foster entrepreneurship usually target the “Early adult transition” cluster, arguing that entrepreneurial intention is created at this stage, even though, it is rather the entrepreneurial attitude that comes into existence at this point. Another remarkable and relevant milestone of Levinson’s life stage development model is linked to the age of c. 29 to 33, called “Thirties transition”, and which is dealing with the evaluation of the accomplishments of the twenties and the adjustments to the adopted life structure. It is a time characterised by instability and change, in which it is to be expected that commitment and satisfaction will remain low: for instance, individuals at this era will express greater intentions to leave their company (Ornstein et al., 1989), and possibly, to create one. This may provide another explanation to why it is observed that the age for new venture creation is around 35 years. Given that entrepreneurial activity does not only depend on the desirability and feasibility of entrepreneurship, but also upon the desirability and feasibility of employment (Kolvereid, 1996b), this could help to explain the increased levels of early-stage entrepreneurship in this age-cluster, and is leading to the following questions: (i) If potential entrepreneurs in their thirties are much more susceptible to change, and considering the aging population and the expected increase of retirement age in the western world the economic importance of “older” entrepreneur’s is likely to increase (Weber, 2004), why then not stimulate them more? (ii) If attitude gets more rigid with age, is applying the same policy strategies to “younger” and “older” potential entrepreneurs really the most efficient approach, or are, this way, policy-makers failing to stimulate a part of the population? (iii) If policy-making is about trying to sell an idea and make the population buy it, why are we then ignoring basic marketing segmentation strategies? In order to provide to our knowledge the first more holistic picture of possible adult development related impacts on entrepreneurial intention, we will proceed in a rather systematic way by choosing different perspectives of aging such as chronological, psychological and organisational, focusing on and around the “midlife” age cluster. Methodology This paper is conceptual in nature, transferring important ideas from adult-development studies to the domain of entrepreneurship. Through our argumentation we will show that an in-depth analysis, in form of comparative studies, of aging-related changes of the factors determining intention is timely. Results To date, there has been only sporadic, short argumentation for aging-related changes of intentional antecedents, such as “organisational age” impacting perceived behavioural control or life-span age impacting how to bear the uncertainty of income from self-employment activity (Shane, 2003). We will provide a more rigorous review of this problematic, and by that hope to contribute to a better understanding of sometimes ambiguous details of study outcomes. Bibliography Aution, E., Keeley, R. H. (2001), ”Entreprenerial intent among students in Scandinavia and in the USA”, Entreprise and Innovation Management Studies, Vol. 2, No. 2, pp.145-160 Davidsson, P. (1995), ”Determinants of entrepreneurial intentions”, Paper prepared for RENT IX Workshop, Piacenza, Italy Douglas, E. J., Dean, A. S. (2002), ”Self-employment as a Career Choice: Attitudes, Entrepreneurial Intentions, and Utility Maximization”, Entrepreneurship: Theory & Practice, Vol. 26, Issue 3, pp. 81-90 Kolvereid, L. (1996), ”Organizational employment versus self-employment: reasons for career choice intentions”, Entrepreneurship: Theory & Practice, Vol. 20, Issue 3, pp. 23-31 Kolvereid, L. (1996b), ”Prediction of Employment Status Choice Intentions”, Entrepreneurship: Theory & Practice, Vol. 21, Issue 1, pp. 47-57 Kristiansen, S., Indarti, N. (2004), ”Entrepreneurial intention among Indonesian and Norwegian students”, Journal of Entreprising Culture, Vol. 12, No. 1, pp. 55-78 Krueger, N. F., Reilly, M. D., Carsrud, A. L. (2000), ”Competing models of entrepreneurial intentions”, Journal of Business Venturing, Vol. 15, Issue 5/6, pp. 411-432 Levinson, D. J., Darrow, C. N., Klein, E. B., Levinson, M. H. and McKee; B. (1978), ”The seasons of a Man’s Life”, Alfred A. Knopf, New York Levinson, D. J. (1986), ”A Conception of Adult Development”, American Psychologist, Vol. 41, No. 1, pp. 3-13 Ornstein, S., Cron, W. L., Slocum, J. W. Jr. (1989), ”Life stage versus career stage: A comparative test of theories of Levinson and Super”, Journal of organizational behaviour, Vol. 10, pp. 117-133 Sears, D. O. (1975), ”Political socialization”, In F.I. Greenstein and N. W. Polsby (Eds.), Handbook of political science, MA: Addison-Wesley Shane, S. (2003), ”A General Theory of Entrepreneurship – The Individual-Opportunity Nexus”, Edward Elgar Publishing, Cheltenham Visser, P. S., Krosnick, J. A. (1998), ”Development of Attitude Strength Over the Life Cycle: Surge and Decline”, Journal of Personality and Social Psychology, Vol. 75, No. 6, pp. 1389-1410 Weber, P., Schaper, M. (2004), ”Understanding the grey entrepreneur”, Journal of Entreprising Culture, Vol. 12, No. 2, pp. 147-164 [less ▲]

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Peer Reviewed
See detailL'office de la Trinité. Liège, Metz, Mayence, Saint-Gall
Close, Florence ULg

Conference (2008, November 20)

L’histoire de l'office de la Trinité a déjà fait couler beaucoup d’encre. Les philologues se sont intéressés à la place du formulaire dans l’histoire des offices versifiés du haut moyen âge, aux sources ... [more ▼]

L’histoire de l'office de la Trinité a déjà fait couler beaucoup d’encre. Les philologues se sont intéressés à la place du formulaire dans l’histoire des offices versifiés du haut moyen âge, aux sources d’inspiration des textes, au principe et à la stratégie d’inspiration ; les musicologues au mode de composition musicale comme au rapport entre les textes chantés et la musique. Par contre, peu a été dit sur la transmission du formulaire – texte et musique confondus – dans l’Eglise occidentale . Cette communication entendait proposer un hypothétique schéma de propagation du formulaire dans la partie orientale de l’ancien empire carolingien, inséré dans une plus large réflexion en cours sur les motifs extra-liturgiques du succès de la première fête votive de l’histoire de la liturgie dans l’Eglise catholique d’Occident. [less ▲]

Detailed reference viewed: 15 (0 ULg)
See detailDrying of wastewater sludge’s, common practice and challenges
Crine, Michel ULg; Léonard, Angélique ULg

Conference (2008, November 20)

Detailed reference viewed: 33 (11 ULg)
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See detailModelling the Ionosphere over Europe: Investigation of NeQuick Formulation
Bidaine, Benoît ULg; Warnant, René ULg

Conference (2008, November 18)

The modelling of the Total Electron Content (TEC) plays an important role in global satellite navigation systems (GNSS) accuracy, especially for single-frequency receivers, the most common ones ... [more ▼]

The modelling of the Total Electron Content (TEC) plays an important role in global satellite navigation systems (GNSS) accuracy, especially for single-frequency receivers, the most common ones constituting the mass market. For the latter and in the framework of Galileo, the NeQuick model has been chosen for correcting the ionospheric error contribution. It has been designed to calculate the electron density at a given point of the ionosphere according to the time conditions and the solar activity. This electron density can be integrated along the path from the receiver to the considered satellite to provide the TEC. For Galileo, a parameter Az (“effective ionisation level”) will be provided to the model as solar activity information and will be daily updated by the ground stations. Since NeQuick was chosen for Galileo purpose, a new version of the model has been released. It involves simplifications in the representation of the bottomside as well as a unique formula for a key parameter of the topside formulation previously defined through two equations, each one used for six months of the year. Hence we decided to investigate consecutive improvements and remaining weaknesses of this new formulation. To this extent, we take benefit of various ionosphere data from several European stations (Chilton in UK, Dourbes in Belgium, El Arenosillo and Roquetes in Spain, Pruhonice in Czech Republic) where ionosonde and GPS TEC data are available for different solar activity levels. These data allow us to study NeQuick representation of the ionosphere at mid-latitudes. We investigate the difference between GPS-derived vTEC and corresponding values from NeQuick for the latest years (between solar maximum in 2000 and minimum in 2007) in order to observe the temporal dependencies towards Universal Time, season and solar activity. We use ionosonde data to constrain the model so that we can concentrate on its formulation of the profile only. We especially highlight the improvements from the second version of NeQuick and show the critical importance of the topside formulation. [less ▲]

Detailed reference viewed: 75 (22 ULg)
See detailHypertension artérielle et sport
Krzesinski, Jean-Marie ULg

Conference (2008, November 18)

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