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See detailTwo millennia of atmospheric lead and heavy metal pollution in Belgium : a record from an ombrotrophic peat bog
De Vleeschouwer; Gerard; Goormaghtigh et al

Conference (2007)

Detailed reference viewed: 2 (1 ULg)
See detailPsychanalyse et psychothérapie psychanalytique
Naziri, Despina ULg

Conference (2007)

Detailed reference viewed: 20 (0 ULg)
See detailEvaluation of Analytical Method Transfer on a Risk Based Methodology using Total Error
Rozet, Eric ULg; Dewe, W.; Govaerts, B. et al

Conference (2007)

Detailed reference viewed: 26 (8 ULg)
See detailModelling the medium-scale TEC structures, observed by Belgian GPS receiver network
Kutiev, Ivan; Marinov, P.; Fidanova, S. et al

Conference (2007)

Detailed reference viewed: 8 (0 ULg)
See detailNotre assiette aujourd'hui et demain
Duquesne, Brigitte ULg

Conference (2007)

Detailed reference viewed: 12 (3 ULg)
See detailEmbryophytes on land: the early steps.
Gerrienne, Philippe ULg

Conference (2007)

Detailed reference viewed: 1 (0 ULg)
Peer Reviewed
See detailThe white matter damage in neonates by inflammation
Battisti, Oreste ULg

Conference (2007)

Detailed reference viewed: 13 (3 ULg)
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See detailL’évolution du peuplement herpétologique en Région wallonne (Belgique)
Jacob, Jean-Paul; Percsy, Christiane; De Wavrin, Hellin et al

Conference (2007)

Detailed reference viewed: 24 (0 ULg)
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See detailL'Etat, les marchés des produits agricoles et le paysan
Lebailly, Philippe ULg

Conference (2007)

Detailed reference viewed: 54 (10 ULg)
Peer Reviewed
See detailComparison of ENFA and GLM modelling for summer habitat suitability of the sperm whale in the northwestern Mediterranean Sea
Praca, Emilie; Gannier, Alexandre; Das, Krishna ULg et al

Conference (2007)

Detailed reference viewed: 16 (0 ULg)
See detailActualités en droit pénal social
Maréchal, Benoît ULg

Conference (2007)

Introduction to the social criminal law.

Detailed reference viewed: 67 (0 ULg)
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See detailPhase I/IIclinical trial of local GM-CSF application in patients with cervical HPV-associated low grade squamous intraepithelial lesions
Hubert, Pascale ULg; Doyen, Jean ULg; Chapelle, X. et al

Conference (2007)

Background: Quantitative and functional alterations of professional antigen-presenting cells (APC) in SIL suggest that these lesions may have a diminished capacity to capture viral antigens. Moreover, GM ... [more ▼]

Background: Quantitative and functional alterations of professional antigen-presenting cells (APC) in SIL suggest that these lesions may have a diminished capacity to capture viral antigens. Moreover, GM-CSF (whose production is decreased in HPV-transformed keratinocytes) is an essential factor for the migration of APC in cervical (pre)neoplastic lesions formed in vitro and transplanted in vivo on mouse. In this study we performed a phase I/II clinical trial in order to determine whether a local application of GM-CSF on cervical low-grade squamous intraepithelial lesions (LSIL) might increase the recruitment of APC into the epithelium and indirectly the viral antigen presentation to the immune system. Methods: Fifteen patients with LSIL (10 GM-CSF and 5 placebo) were enrolled in this study. Patients received 4 GM-CSF applications (or placebo gel) and were followed during 6-7 months. APC infiltration was quantified by immunostaining with anti-CD1a mAb. Cellular immune response was evaluated by using an IFN-gamma intracellular staining on PBMC stimulated in vitro with the E7 HPV16 protein and L1 HPV16 Virus-like particles (VLP). Hybrid capture was performed to semi-quantify the viral DNA in cervical brush specimens. Results: GM-CSF applications were well tolerated in all patients. No difference in the cytological/histological and viral parameters assessed at 2 and 6 months after the last application was observed between the GM-CSF and the placebo group. An increased number of CD1a+ APC was observed in 6/10 patients treated by GM-CSF compared to 1/5 patient in the placebo group. There was an increased immune response against HPV in the GM-CSF group showed by NK and T cells producing IFN-gamma. [less ▲]

Detailed reference viewed: 38 (10 ULg)
See detailEvolution des eucaryotes au précambrien
Javaux, Emmanuelle ULg

Conference (2007)

Detailed reference viewed: 13 (0 ULg)
See detailImpact of future Greenland deglaciation on global weathering fluxes and atmospheric CO2
Munhoven, Guy ULg; Brovkin, Victor; Ganopolski, A. et al

Conference (2007)

About 1.76×10^6 km2 of Greenland are currently covered by ice. It is expected that this large ice mass will melt away over the next 3000 years if anthropogenic CO2 emissions continue to rise (Alley et al ... [more ▼]

About 1.76×10^6 km2 of Greenland are currently covered by ice. It is expected that this large ice mass will melt away over the next 3000 years if anthropogenic CO2 emissions continue to rise (Alley et al., 2006). As a result, the bedrock currently covered by ice will lie free and become subject to chemical weathering. The resulting weathering fluxes will contribute to increase both the consumption rate of atmospheric CO2 and the production rate of riverine bicarbonate. Increasing these two fluxes will tend to decrease the atmospheric CO2 partial pressure, as a result of the modified ocean-atmosphere carbon cycle. Chemical weathering may thus possibly act as a negative feedback in the Greenhouse World. Other changes (e.g., vegetation cover and additional climate change) concomitant with the melting of the Greenland ice-sheet may either amplify or dampen, if not reverse the weathering effect. Here we use the intermediate complexity Earth System model CLIMBER-2 to quantify and analyse the weathering flux changes that result from the projected melting of the Greenland ice sheet and the implications for atmospheric CO2. The biogeochemical module of CLIMBER-2 has been extended to account for the consumption of atmospheric CO2 and the production of riverine bicarbonate by continental weathering processes, as a function of geographically distributed runoff (interactively provided by the CLIMBER-2 climate module) and lithology (derived from Amiotte Suchet et al., 2003). We find that the increased weathering processes alone would lead to a sustained 0.2 ppm/kyr decrease in atmospheric pCO2. The climate change resulting from the deglaciation of Greenland reduces the magnitude of this trend to 0.1 ppm/kyr. Only in the case where the effect of freshly comminuted bedrock is taken into account (Clark et al., 2006) does the weathering feedback help to reduce atmospheric pCO2 by about 10 ppm in 5000 years. Alley R.B. et al. (2005) Science 310, 456–460. Amiotte Suchet P. et al. (2003) Global Biogeochemical Cycles 17, 1139, doi:10.1029/2002GB001891. Clark P.U. et al. (2006) Quaternary Science Reviews 25, 3150–3184. [less ▲]

Detailed reference viewed: 52 (1 ULg)
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See detailApplication of Laser Induced Breakdown Spectroscopy (LIBS) to the determination of transition probabilities of laser lines in Au II spectrum
Ortiz, M.; Mayo, R.; Biémont, Emile ULg et al

Conference (2007)

Experimental branching fractions for laser lines arising from excited states of 5d97s configuration of Au II have been determined by application of Laser Induced Breakdown Spectroscopy (LIBS). The ... [more ▼]

Experimental branching fractions for laser lines arising from excited states of 5d97s configuration of Au II have been determined by application of Laser Induced Breakdown Spectroscopy (LIBS). The experimental relative transition probabilities were converted into an absolute scale using theoretical values for the radiative lifetimes of the corresponding states, calculated in this work. Transition probabilities and radiative lifetimes have been determined by a relativistic Hartree - Fock method taking configuration interaction and core-polarization effects into account. A comparison of the present results with the available theoretical values has been made and shows a reasonable agreement although discrepancies are observed between theory and experiment for some transitions. [less ▲]

Detailed reference viewed: 37 (0 ULg)
See detailMood Food
Goffin, Dorothée ULg

Conference (2007)

Mood-food can be understood as a nutrition substance, which is able to influence the good disposition of a person. Regulation is made by Neurotransmitters such as endorphins, serotonin, norepinephine and ... [more ▼]

Mood-food can be understood as a nutrition substance, which is able to influence the good disposition of a person. Regulation is made by Neurotransmitters such as endorphins, serotonin, norepinephine and dopamine, made from amino acids through chemical pathways requiring vitamins and minerals as cofactors. [less ▲]

Detailed reference viewed: 12 (0 ULg)
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See detailCarbon xerogels as catalyst supports for PEM fuel cell cathode
Job, Nathalie ULg; Marie, Julien; Lambert, Stéphanie ULg et al

Conference (2007)

Detailed reference viewed: 19 (2 ULg)
See detailCreation of Dicke States in Distant Qubits with Linear Optics
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 5 (0 ULg)
See detailMeasurement-induced spatial modulation of spontaneous decay and photon arrival times
von Zanthier, J.; Bastin, Thierry ULg; Agarwal, G. S.

Conference (2007)

Detailed reference viewed: 1 (0 ULg)
See detailQuantum imaging with incoherent photons
Thiel, C.; Solano, E.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 7 (4 ULg)
See detailCreation of Dicke States in Distant Qubits with Linear Optics
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 1 (0 ULg)
See detailQuantum imaging with incoherent photons
von Zanthier, J.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 4 (3 ULg)
See detailGeneration of Dicke states in Distant Matter Qubits with Linear Optics
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 3 (0 ULg)
See detailQuantum imaging with incoherent photons
von Zanthier, J.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2007)

Detailed reference viewed: 8 (6 ULg)
Peer Reviewed
See detailCapital social et variables socio-démographiques : quelle valeur ajoutée ?
Italiano, Patrick ULg; Jacquemain, Marc ULg

Conference (2007)

The paper presents a multivariate analysis of survey data to assess in what measure indicators of social capital keep an explanatory power when we control main socio-demographic variables. The result is ... [more ▼]

The paper presents a multivariate analysis of survey data to assess in what measure indicators of social capital keep an explanatory power when we control main socio-demographic variables. The result is that those variable do not absorb the totality of the effect of social capital but the remaining impact is weak. [less ▲]

Detailed reference viewed: 26 (4 ULg)
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See detailNeonatal screening of hemoglobinopathies on dried blood
BOEMER, François ULg

Conference (2007)

Detailed reference viewed: 19 (6 ULg)
See detailTotal Error-Based Criterion for Analytical Method Transfer Experiments
Rozet, Eric ULg; Dewe, W.; Boulanger, Bruno ULg et al

Conference (2007)

Detailed reference viewed: 11 (3 ULg)
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See detailSynthèse de chélateurs bifonctionnels en vue du développement d’agents de contraste pour l’IRM
Thonon, David ULg; Paris, Jérôme; Jacques, Vincent et al

Conference (2007)

Detailed reference viewed: 6 (1 ULg)
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See detailLes consommateurs : entre attentes et pratiques
Duquesne, Brigitte ULg

Conference (2007)

Detailed reference viewed: 26 (6 ULg)
Peer Reviewed
See detailEnhancement of the relaxation of SiGe layers by He ion implantation using a delta-Si:C layer
Buca, D.; Goryll, M.; Holländer, B. et al

Conference (2007)

Detailed reference viewed: 3 (0 ULg)
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See detailEcological Impacts of Invasive Plant Species
Vanderhoeven, Sonia ULg

Conference (2007)

Detailed reference viewed: 9 (0 ULg)
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See detailExperimental models/cell model: organotypic cultures
Jacobs, Nathalie ULg; Delvenne, Philippe ULg

Conference (2007)

Detailed reference viewed: 20 (0 ULg)
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See detailClimatic differentiation of the invasive alien plant Senecio inaequidens (Asteraceae) during invasion
Monty, Arnaud ULg; Mahy, Grégory ULg

Conference (2007)

Despite the problems they cause, biological invasions represent a great opportunity to study large-scale plant evolution, e.g. in response to changing climate. Senecio inaequidens DC. is an herbaceous ... [more ▼]

Despite the problems they cause, biological invasions represent a great opportunity to study large-scale plant evolution, e.g. in response to changing climate. Senecio inaequidens DC. is an herbaceous perennial originating from South Africa. It was introduced as a wool alien in a few precise locations about one century ago and after a lag phase of several decades, started to spread rapidly throughout Europe and its contrasted climate. Our study uses common garden experiments to assess the differentiation of the species along both altitudinal and climatic gradients. Life history traits are measured and linked to climatic conditions of source populations. Results show that the species evolved along a climatic gradient from the Mediterranean to the high Pyrenean. This along-invasion differentiation can be linked to mean temperature evolution along the gradient and shows how an introduced species can potentially develop adaptations to new encountered thermic conditions in a length of time of several decades. How understanding the adaptive response of a plant to new climatic conditions will help anticipating the potential response of the flora to climate change is discussed. [less ▲]

Detailed reference viewed: 9 (3 ULg)
See detailHybrid Model for Kp prediction, combining solar wind and magnetometer data
Kutiev, Ivan; Andonov, B.; Muhtarov, P. et al

Conference (2007)

Detailed reference viewed: 18 (0 ULg)
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See detailEvaluations plurielles : concepts et défis
Vandoorne, Chantal ULg; Demarteau, Michel

Conference (2007)

Detailed reference viewed: 22 (11 ULg)
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See detailPARTICIPATION OF ULG STUDENTS TO THE SSETI MICROSATELLITE PROGRAMME USING SAMCEF
Bolland, M.; COLLIGNON, G.; VANDENPLAS, X. et al

Conference (2007)

The objective of this presentation is to discuss the participation of students at the University of Liège to the educational spacecraft project SSETI-ESEO proposed by the European Space Agency. SSETI ... [more ▼]

The objective of this presentation is to discuss the participation of students at the University of Liège to the educational spacecraft project SSETI-ESEO proposed by the European Space Agency. SSETI students are now mainly involved in the ESEO satellite for which the University of Liège is in charge of the MECH work package. The students have to propose a design for the structure of the solar panels (including the geometry and materials) and their deployment and pointing mechanisms (including electrical circuits, motors, hinges and actuators). Through detailed finite element computations in the SAMCEF software, they have to verify the structural integrity of the panels during the launch phase and to guarantee a safe deployment once on-orbit. Another task is to ensure an appropriate orientation of the solar panels to collect the maximum power from the sun. An industrial partner specialized in the development of computer-aided engineering solutions, SAMTECH, and a research center, Liège Space Center (CSL), also bring their expertise to the project. [less ▲]

Detailed reference viewed: 60 (8 ULg)
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See detailLEODIUM project and student space activities at the University of Liege
Vandenrijt, Jean-François ULg; Rochus, Pierre ULg; Kerschen, Gaëtan ULg et al

Conference (2007)

the origin of the LEODIUM project which stands for Low Earth Orbit Demonstration of Innovations in University Mode. This project aims to create student pico- or nano-satellites. There is a strong ... [more ▼]

the origin of the LEODIUM project which stands for Low Earth Orbit Demonstration of Innovations in University Mode. This project aims to create student pico- or nano-satellites. There is a strong motivation coming from the students and from the academic members to promote space. Being unexperienced in complete satellite design, as a first step in this direction, we started working with the ESA funded SSETI association. At the moment, two teams of students are working on SSETI satellites. One is working as the MECH team which is in charge of the design of the sun-pointing solar panels of the European Student Earth Orbiter (ESEO) satellite mechanisms, the other team is working on the phase-A studies of the Narrow Angle Camera (NAC) which will be the core payload of the European Student Moon Orbiter (ESMO) satellite, both in collaboration with local industrials. The students are mainly working on ESEO and ESMO as part of their master thesis. In addition to that, two PhD students are in charge of the coordination of the teams (one for the ESEO team and another for the ESMO team). They will also be the link between previous and new students every times an overlap will occur and ensure that information is not lost during the transition. In this paper, we will describe the current design and the achievements on the ESEO solar panels and the ESMO NAC camera. Explanation will also be given on how the collaboration between the local student and the SSETI association is managed. Finally, we will briefly introduce the prospective for the LEODIUM project. [less ▲]

Detailed reference viewed: 61 (7 ULg)
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See detailInfluence of water exchanges on the gallery convergence
Gerard, Pierre ULg; Charlier, Robert ULg; Chambon, René et al

Conference (2007)

Detailed reference viewed: 21 (6 ULg)
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See detailNew insights in the thermomechanical modelling of soils
Laloui, Lyesse; François, Bertrand ULg

Conference (2007)

Detailed reference viewed: 13 (1 ULg)
Peer Reviewed
See detailWhat about concrete in the next thirty years ?
Courard, Luc ULg

Conference (2007)

Detailed reference viewed: 6 (0 ULg)
See detailGene regulation in Arabidopsis halleri, a model system to understand zinc homeostasis in plants.
Hanikenne, Marc ULg; Talke, Ina N.; Lanz, Christa et al

Conference (2006, December 18)

Detailed reference viewed: 14 (1 ULg)
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See detailLarge-scale groundwater modelling in the Walloon part of the Meuse basin: challenges and first steps
Brouyère, Serge ULg; Orban, Philippe ULg

Conference (2006, December 14)

This presentation described the first steps in the development of large (groundwater body) scale groundwater flow and transport modelling in the Meuse district

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailCattedrale e collegiali di Liegi
Corswarem, Emilie ULg

Conference (2006, December 07)

Detailed reference viewed: 11 (0 ULg)
See detailSorties d’écoles et chemins de l’insertion : un parcours brouillé
Farvaque, Nicolas; Moulaert, Thibault; Orianne, Jean-François ULg

Conference (2006, December 06)

Detailed reference viewed: 12 (2 ULg)
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See detailSyndrome de Hoffmann aux urgences
Kaux, Jean-François ULg

Conference (2006, December 05)

Detailed reference viewed: 46 (27 ULg)
See detailL’interférence de l’ARN (ARNi): un mécanisme fondamental longtemps ignoré
Cornet, Anne ULg

Conference (2006, December 05)

Detailed reference viewed: 12 (3 ULg)
See detailCalcification and transparent exopolymer particles (TEP) production in batch cultures of Emiliania huxleyi exposed to different pCO2
De Bodt, Caroline; d'Hoop, Quentin; Harlay, Jérôme ULg et al

Conference (2006, December 04)

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailMagnetotail topology around substorm onset time
Meurant, M.; Donovan, E. F.; Gérard, Jean-Claude ULg et al

Conference (2006, December 01)

The time evolution of the magnetotail topology during minutes preceding and following substorm onset is an important question of the magnetospheric dynamic. The substorm onset is a local and explosive ... [more ▼]

The time evolution of the magnetotail topology during minutes preceding and following substorm onset is an important question of the magnetospheric dynamic. The substorm onset is a local and explosive phenomenon, which makes it difficult to describe with in situ data. In this study, we investigate this problem thanks the remote sensing data provided by the FUV camera onboard the IMAGE spacecraft. In the first part of this study, we use a set of IMAGE-FUV and GOES-8 simultaneous observations obtained during substorms periods to develop a model of the magnetic field elevation angle at geosynchronous orbit. In the second part, we use a set of 259 substorms observed by the IMAGE spacecraft between 2000 and 2002. Taking advantage of the global scale of the observations provided by IMAGE-FUV, we describe the time evolution of the magnetotail topology provided by the model. An interesting result shows that the field is symmetrically stretched around the onset position before the onset time and this symmetry is broken after onset, with a more important stretching duskward to the onset. [less ▲]

Detailed reference viewed: 20 (9 ULg)
See detailComprehensive auroral imaging of Saturn during the International Heliophysical Year
Nichols, J. D.; Clarke, J. T.; Duval, J. et al

Conference (2006, December 01)

As part of the International Heliophysical Year in 2007, a large-scale campaign is planned to observe the UV auroras of Jupiter and Saturn with the Hubble Space Telescope (HST). In this talk we will ... [more ▼]

As part of the International Heliophysical Year in 2007, a large-scale campaign is planned to observe the UV auroras of Jupiter and Saturn with the Hubble Space Telescope (HST). In this talk we will provide an overview of the Saturn campaign. Previous HST observations of Saturn's auroras have greatly extended our knowledge of the processes that occur in the planet's magnetosphere. In particular, Saturn's main oval auroras vary much more than Jupiter's in terms of latitudinal position and extent, and have been shown to be correlated with the conditions in the solar wind. However, these campaigns have generally been limited by their short-term nature, and in order to establish exactly how the auroras depend on the solar wind we must make observations continually over at least one complete solar rotation. This is the goal of the 2007 campaign, in which Saturn will be observed for a period of 30 days in January and February. The timing is fortuitous since not only will the planet be in opposition, allowing near-Earth measurements of the interplanetary medium to be extrapolated to Saturn's orbit, the Cassini spacecraft will be in a position to obtain in-situ plasma and magnetic field measurements from the magnetosphere and solar wind. Cassini will also make observations of Saturn's UV and SKR emissions throughout the campaign, and the planet will be observed by ground-based IR and radio telescopes. Here we provide a brief review of our current understanding of Saturn's auroras, along with an overview of the coordinated observations planned at Saturn and the key science goals we aim to address. [less ▲]

Detailed reference viewed: 16 (1 ULg)
See detailThe HST UV Auroral Imaging Campaign of Jupiter and Saturn during the International Heliophysical Year
Clarke, J. T.; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2006, December 01)

An extended campaign of observations of the UV auroral emissions from Jupiter and Saturn is scheduled for three periods beginning in Jan. 2007 and ending in late June 2008. This will be by far the most ... [more ▼]

An extended campaign of observations of the UV auroral emissions from Jupiter and Saturn is scheduled for three periods beginning in Jan. 2007 and ending in late June 2008. This will be by far the most extensive series of remote high resolution imaging of planetary aurora to date, and should provide new physical insight into the cause and effect relationships governing the controlling processes for the giant planet auroral emissions. These observations will overlap with in situ measurements of local solar wind and magnetospheric plasma conditions by Cassini at Saturn in Jan. 2007 and by the New Horizons mission approaching Jupiter in Feb. 2007. The UV auroral emission brightness and distributions will also be compared with extrapolated estimates of the solar wind conditions near each planet from periods just before planetary opposition in Jan. 2007 (Saturn) and June 2007 (Jupiter). The HST observations will also be coordinated with ground-based observations of near-IR auroral and nonthermal radio emissions. This paper will give an overview of the program, including the schedule of HST observations and the schedule of known coordinated observations. While a preliminary schedule has been submitted for the HST observations, this schedule will be finalized only when the HST orbit is sufficiently well known for the periods of observation for detailed pointing to be specified. By the time of Fall AGU, it should be possible to show the detailed schedule and pointing for the Jan-Feb 2007 observations. The paper will include a presentation of the plans for the rapid reduction and distribution of the HST auroral images to the community. [less ▲]

Detailed reference viewed: 15 (1 ULg)
See detailSaturn's Auroras and Polar Atmosphere from Cassini UVIS
Pryor, W. R.; West, R.; Larsen, K. et al

Conference (2006, December 01)

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed two 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 two 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, with sufficient spatial resolution to image Saturn's auroral oval when Cassini leaves Saturn's equatorial plane. We will present new images and time-series data from summer 2006. Detailed spectral models of molecular hydrogen auroral emissions that include hydrocarbon absorption and hydrogen self- absorption have now been compared to UVIS data. We are analyzing a UV spectral feature detected in an auroral oval image from 2005. The feature is an absorption feature concentrated inside the oval, at wavelengths dominated by reflected sunlight and acetylene absorption. The absorption feature appears as a broad absorption "scoop". One plausible molecule that has a similar absorption feature is benzene, which has a cross-section some 500 times larger than acetylene in this spectral region. Thus UVIS is sensitive to small quantities of benzene. Enhanced polar benzene has been previously observed at Jupiter and can be generated in coupled photochemical/auroral models. We will explore the uniqueness of this interpretation, and compare the inferred benzene abundances to results from complementary Cassini CIRS infrared observations. Additional out of the equatorial plane UVIS Saturn data planned for the coming months will improve the signal- to-noise ratio and spatial resolution on the auroral ovals and their interior. Coordinated observations with Cassini VIMS and Hubble Space Telescope are being scheduled for 2007. [less ▲]

Detailed reference viewed: 31 (1 ULg)
See detailSynthesis of block copolymers and their use for biomedical applications
Jérôme, Christine ULg

Conference (2006, December)

Detailed reference viewed: 3 (1 ULg)
Peer Reviewed
See detailLe portrait dans Daguerréotypes d'Agnès Varda
Van Cauwenberge, Geneviève ULg

Conference (2006, December)

Detailed reference viewed: 54 (6 ULg)
Peer Reviewed
See detailLe sens de l’orientation. Résistance, ouverture et relégation
Andre, Géraldine ULg

Conference (2006, December)

Detailed reference viewed: 2 (0 ULg)
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See detailSound field modeling in architectural acoustics using a diffusion equation
Picaut, Judicaël; Valeau, Vincent; Billon, Alexis ULg et al

Conference (2006, December)

A numerical approach is proposed to model the reverberated sound field in rooms. The model is based on the numerical implementation of a diffusion model enabling spatial variations of the sound energy ... [more ▼]

A numerical approach is proposed to model the reverberated sound field in rooms. The model is based on the numerical implementation of a diffusion model enabling spatial variations of the sound energy within a room, unlike the statistical theory. The proposed method allows to take into account most of complex phenomena encountered in room acoustics, like mixed reflections on walls (diffuse and specular), low and high absorption on walls, atmospheric attenuation, fitted zones. Moreover, the model can be applied to complex geometries, like multiple coupled rooms of different sizes. In this paper, the model and its numerical implementation are first detailed. Then, an application is proposed for a complex geometry defined by multiple coupled rooms with fitting objects, including low and high absorption on walls, in terms of sound level and reverberation times. The main interest of the model is that such approach requires less computational time in comparison with common approaches like ray-tracing simulations. [less ▲]

Detailed reference viewed: 33 (1 ULg)
See detailAtmospheric Carbon Dioxide and Climate Over Phanerozoic Times
François, Louis ULg; Lefèbvre, Vincent; Goddéris, Yves et al

Conference (2006, December)

The atmospheric CO2 mixing ratio has fluctuated widely over the Phanerozoic, according to the estimates from available proxy records. Because atmospheric CO2 is a major greenhouse gas, these fluctuations ... [more ▼]

The atmospheric CO2 mixing ratio has fluctuated widely over the Phanerozoic, according to the estimates from available proxy records. Because atmospheric CO2 is a major greenhouse gas, these fluctuations should have led to significant climatic variations. The "classical" view is indeed that atmospheric CO2 has been the main driver of the Earth's climate history. On long-term time scales, the atmospheric CO2 level is the result of the balance between CO2 inputs from volcanoes or oxidation of old organic carbon (kerogen) in exposed rocks and outputs through silicate weathering or organic carbon deposition. Existing model reconstructions of the Phanerozoic history of atmospheric CO2 are based on such budgets. Recent data and model experiments currently challenge these models. First, the carbon cycle may be more complex than represented in the earliest models. In particular, silicate weathering depends on numerous factors, which are not obvious to model or are poorly known over the Phanerozoic. Mountain uplift is one such factor, which has been much debated in the last decade. Lithology is another example: basalts weather much more rapidly than other silicate rocks and the emplacement of large basaltic areas on the continents may trigger glaciations. Continental configuration is also more important than previously thought, as indicated by recent model experiments on super-continent fragmentation coupling geochemical and climate models. Problems of "classical" Phanerozoic CO2 models are also well illustrated by the fact that the most recent estimates of CO2 degassing show very little variation between the Cretaceous and the present, a period when large changes in CO2 have occurred, whereas degassing is the most important forcing of CO2 evolution in long-term carbon cycle models. Second, CO2 is not the only driver of climate evolution. This obvious fact has largely been forgotten in Phanerozoic studies. What the proxies tell us on paleo-atmospheric CO2 is not always in line with what we know about paleoclimatic records. For instance, the proxies suggest relatively high CO2 levels during the Late Ordovician glaciations. Similarly, the Late Jurassic now appears to be colder than earlier thought, while again proxies suggest high atmospheric CO2 at that time. The mid-Miocene climate warming, which occurs simultaneously with a drop in CO2, provides another example. This latter change in CO2 is unanimously reflected in all proxies and, so, this decoupling between CO2 and climate cannot arise from uncertainties on the reconstructed CO2 levels or from dating problems, as might be the case of the former two examples. Other climatic drivers than CO2 clearly need to be considered. In this respect, vegetation- climate feedbacks have been completely disregarded in long-term climatic studies. Cenozoic cooling is, however, accompanied by a progressive transition from closed forests to more widespread grasslands and deserts on the continental areas, a change which must have had major impacts on the surface albedo and the water cycle. [less ▲]

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