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See detailUsing a 2D Model of the Io Plasma Torus to Investigate the Effects of Density Variations on the Morphology and Intensity of the Io Footprint
Payan, Alexia; Rajendar, Ashok; Paty, Carol et al

Poster (2012, December 06)

Io is the primary source of plasma in the Jovian magnetosphere, continuously releasing approximately 1 ton/s of SO2 from volcanic eruptions. The interaction of Io with Jupiter’s magnetosphere is strongly ... [more ▼]

Io is the primary source of plasma in the Jovian magnetosphere, continuously releasing approximately 1 ton/s of SO2 from volcanic eruptions. The interaction of Io with Jupiter’s magnetosphere is strongly influenced by the density structure of the resulting plasma torus and the position of Io relative to the center of the torus [Bonfond et al. 2008]. This unusual interaction produces a complex auroral feature on Jupiter’s ionosphere known as the Io footprint. Hubble Space Telescope (HST) observations of Jupiter’s far-UV aurora during spring 2007 showed an increased number of isolated auroral blobs along with a continuous expansion of Jupiter’s main auroral oval over a few months. These blobs were associated with several large injections of hot plasma between 9 and 27 Jovian radii. These events coincided with a large volcanic eruption of the Tvashtar Paterae on Io, as observed by the New Horizons spacecraft [Spencer et al., 2007]. This, in turn, may have resulted in a significant increase in the plasma torus density. Besides, on June 7th, 2007, the Io footprint momentarily became so faint that it disappeared under a diffuse patch of emission remaining from an injection blob [Bonfond et al., 2012]. The goal of the present study is to examine the relationship between the increased density of the plasma torus and the dimming of the Io footprint. We implement a 2D model of the Io plasma torus that treats the variable-density torus as being composed of discrete layers of uniform density. As the co-rotating plasma in the plasma torus impinges on Io, Alfvén waves are launched at a pushback angle obtained from Gurnett and Goertz [1981]. The waves propagate inside the plasma torus through reflection and refraction at density discontinuities where they lose some of their initial energy. Using the above model, we can track the Alfvén wave fronts in the plasma torus and determine the longitude at which they exit the torus along with the corresponding remaining energy. Since Alfvén waves are capable of accelerating charged particles along magnetic field lines, we assume that the discrete Io footprint features are created at these longitudes, and that the intensity of each of these features is positively correlated to the energy transported by the wave front as it exits the plasma torus. Therefore, the model allows us to investigate both the effects of density changes and of Io’s position in the plasma torus on the intensity and the morphology of the Io footprint. In this context, the model enables us to determine the density increase in the plasma torus required to explain the apparent disappearance of Io footprint given its position at that time. [less ▲]

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See detailHydrodynamique et Architecture Navale
Hage, André; Rigo, Philippe ULg; Lapy, Matthieu ULg

in Journées scientifiques et techniques du CETMEF 2012 (2012, December 05)

State of art en matière d'hydrodynamique navale et architecture navale pour la navaigatio nfluviale

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See detailZinc hyperaccumulation: a model to examine metal homeostasis in plants
Hanikenne, Marc ULg

Scientific conference (2012, December 05)

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See detailDes controverses souterraines et silencieuses ? Les vers de terre (lombricidés), l’agronomie et l’agriculture : d’une « non-histoire » à leur délicate mobilisation dans la conception et l’évaluation de formes contemporaines d’agricultures « durables »
Dannevoye, Bastien ULg

Conference (2012, December 05)

This communication investigates the recent and marginal scientific and agronomic interest in earthworms (or "lumbricids"), which paradoxically accounts for the first animal biomass of the globe. After ... [more ▼]

This communication investigates the recent and marginal scientific and agronomic interest in earthworms (or "lumbricids"), which paradoxically accounts for the first animal biomass of the globe. After giving some historical points of reference about earthworms' quite recent scientific knowledge-building - thanks to soil scientists and biologists' works -, we present the manner in which the earthworms and their agricultural and ecological functions are valued today amongst groups of farmers linked to "conservation agriculture practices". This second part is built on sociological observation and interviews amongst those "conservation farmers", at work as well as communicating on their soil conservation practices (no-till, direct drilling, etc.). By doing that, we aim at describing how the earthworms, conceived as "intermediary objects" and "spokesperson" of the much larger soil biology, allows for those practicians to make strongly hold together production and environmental challenges in the agriculture they're developing... instead of opposing those stakes as it's usually the case. [less ▲]

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See detailLa maison zéro énergie, et après ?
Monfils, Stéphane ULg

Conference given outside the academic context (2012)

Introduction à la future réglementation, à la problématique des bâtiments existants et à la performance environnementale

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See detailLe partenariat CITET - CWBI : 10 années de collaboration scientifique et transfert technologique sur la valorisation énergétique des biomasses
Hiligsmann, Serge ULg; Sayahi, Lamia; Tangour, Douha et al

Conference (2012, December 05)

Les procédés de biométhanisation sont bien connus de par le monde et applicables à presque toute matière organique, même résiduaire. Ils possèdent des rendements et spécificités qui les rendent ... [more ▼]

Les procédés de biométhanisation sont bien connus de par le monde et applicables à presque toute matière organique, même résiduaire. Ils possèdent des rendements et spécificités qui les rendent intéressants pour des applications à petite comme à grande échelle. Du point de vue technologique, le concept de la biométhanisation, est relativement proche de celui des procédés agro-alimentaires. Ce processus de valorisation des déchets organiques est donc plus facilement intégrable dans un procédé agroalimentaire que les autres procédés de valorisation (gazification, pyrolyse, etc,..). La biométhanisation offre aussi l'avantage de pouvoir s'appliquer à des rejets liquides, semi-solides et solides. Par ailleurs, les procédés agro-alimentaires sont nombreux en Tunisie, leurs rejets peuvent contenir de la matière organique de relativement bonne qualité pour la biométhanisation. Toutefois, les conditions de mise en œuvre de la biométhanisation mais aussi de la cogénération en aval doivent être définies au cas par cas afin de conduire à une valorisation efficace des matières et une utilisation rentable du biogaz produit. Depuis plus de 10 ans, des axes de recherche et développement privilégiés ont été définis par les partenaires du CITET et du CWBI (Université de Liège, Belgique) en vue de promouvoir la valorisation des déchets organiques issus du secteur agro-alimentaire et des déchets ménagers. Les premiers travaux s’étaient focalisés sur l’étude de l’impact environnemental et la modélisation de la production de méthane au sein des centres d'enfouissement technique pour déchets ménagers. Forts de cette expérience et d’une compréhension mutuelle, concrétisées par plusieurs publications internationales, les deux centres ont pu aborder de réels transferts technologiques avec assistance technique et programmes de formation&training sur la biométhanisation des déchets organiques du secteur agro-alimentaire : technologie présentant des avantages importants sur le plan environnemental, économique et énergétique. Les travaux portent sur la caractérisation et la codigestion de matières organiques résiduaires liquides et/ou solides provenant des industries agroalimentaires, abattoirs, marchés, restaurants, épiceries, déchets des ménages, … Ils sont complétés par des stages de formation sur le dimensionnement des installations ; missions à l’étranger ; contacts avec des administrations de contrôle et/ou aide à l’investissement; visites et/ou suivis de bioréacteurs pilotes ou industriels. [less ▲]

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See detailCoronary heart disease: the MONICA-BELLUX Register
JeanJean, Michel; Krzesinski, Jean-Marie ULg; Wunsch, Guillaume

Conference (2012, December 05)

Background : Cardiovascular diseases contribute to 42% of overall mortality in the European Union. Over a third of deaths from CVD are from coronary heart disease and just over a quarter are from ... [more ▼]

Background : Cardiovascular diseases contribute to 42% of overall mortality in the European Union. Over a third of deaths from CVD are from coronary heart disease and just over a quarter are from cerebrovascular disease (stroke). Standardized death rates for heart disease have fallen dramatically in the last 25 years in Western Europe, both for men and for women. Multinational MONItoring of trends and determinants in CArdiovascular disease The MONICA Project : A major source of information on cardiovascular diseases established in the early 1980s under the auspices of WHO, to monitor trends in cardiovascular diseases and to relate these to risk factor changes over a ten year period. There were a total of 37 MONICA Collaborating Centres in 21 countries (including 29 populations in 16 European countries). The ten year data collection was completed in the late 1990s, though several Centres are still active today. Conclusions : CVD registers remain nevertheless an invaluable source for monitoring levels and trends in incidence and case fatality. Trends in incidence rates and in case fatality rates can significantly differ from one another. This situation requires better detection of individuals at risk. The intervention component of the BELLUX register is well-suited for this task. [less ▲]

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See detailDurabilité de lots de bois de peuplier modifié thermiquement
Jourez, Benoît ULg; Verheyen, Cécile

Conference (2012, December 05)

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See detailCatalytic purification of biogas
Claude, Vincent ULg; Lambert, Stéphanie ULg

Poster (2012, December 05)

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See detailContesting Frames in Public Health
Hendrickx, Kim ULg

Scientific conference (2012, December 05)

Detailed reference viewed: 7 (1 ULg)
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See detailGround-based remote sensing of tropospheric water vapour isotopologues within the project MUSICA
Schneider, M.; Barthlott, S.; Hase, F. et al

in Atmospheric Measurement Techniques (2012), 5(2012), 3007-3027

Within the project MUSICA (MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water), long-term tropospheric water vapour isotopologue data records are provided for ... [more ▼]

Within the project MUSICA (MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water), long-term tropospheric water vapour isotopologue data records are provided for ten globally distributed ground-based mid-infrared remote sensing stations of the NDACC (Network for the Detection of Atmospheric Composition Change). We present a new method allowing for an extensive and straightforward characterisation of the complex nature of such isotopologue remote sensing datasets. We demonstrate that the MUSICA humidity profiles are representative for most of the troposphere with a vertical resolution ranging from about 2 km (in the lower troposphere) to 8 km (in the upper troposphere) and with an estimated precision of better than 10%. We find that the sensitivity with respect to the isotopologue composition is limited to the lower and middle troposphere, whereby we estimate a precision of about 30‰ for the ratio between the two isotopologues HD16O and H216O. The measurement noise, the applied atmospheric temperature profiles, the uncertainty in the spectral baseline, and the cross-dependence on humidity are the leading error sources. We introduce an a posteriori correction method of the cross-dependence on humidity, and we recommend applying it to isotopologue ratio remote sensing datasets in general. In addition, we present mid-infrared CO2 retrievals and use them for demonstrating the MUSICA network-wide data consistency. In order to indicate the potential of long-term isotopologue remote sensing data if provided with a well-documented quality, we present a climatology and compare it to simulations of an isotope incorporated AGCM (Atmospheric General Circulation Model). We identify differences in the multi-year mean and seasonal cycles that significantly exceed the estimated errors, thereby indicating deficits in the modeled atmospheric water cycle. [less ▲]

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See detailBiolixiviation de la carrolite-Application aux minerais polymétalliques de l'Arc Cuprifère du Katanga (cas de minerais de la mine de Kamoya, Kambove) en RDC
Nkulu Wa Ngoie, Guy ULg

Doctoral thesis (2012)

The present work focuses on the bioleaching of carrolite as pure mineral and application of bioleaching as an alternative technique for processing the polymetallic sulphide ores in Katanga copperbelt ... [more ▼]

The present work focuses on the bioleaching of carrolite as pure mineral and application of bioleaching as an alternative technique for processing the polymetallic sulphide ores in Katanga copperbelt (case of Kamoya deposit ores) in Democratic Republic of Congo (DRC). A preliminary study on the bioleaching of carrolite in the presence of mesophilic bacteria has highlighted the effect of the initial pH (pH = 1.5, 2.0 and 2.5), particle size (-53μm, -75+53 µm, -106+75µm), the pulp density (dp= 2.5 and 10) on the pH, the solution redox and on the dissolution performance of copper, nickel and cobalt. The results obtained at this stage showed that the initial pH, particle size and pulp density greatly influences the process of bioleaching of carrolite. The evolution of pH, solution redox and the efficiency of metals dissolution with time considering these factors indicate the importance of bacterial growth. Good bacterial activity thereby yields high metal dissolution which is being obtained at initial pH 2.0, particle size of -53μm and 2% pulp density. A second study upon the bioleaching of carrolite has allowed highlighting the metal dissolution mechanism during the bioleaching process. The evolution of the bacterial population, observations of Optical Microscope (MO), Scanning Electron Microscope (SEM), Confocal Laser Scanning Microscope (CLSM) of carrolite grains during bioleaching and spectroscopical analysis in X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) of bioleaching residues allowed us to demonstrate the role and importance of bacteria attached on the surface of carrolite grains from one hand, and ferric ions on the other hand, during the carrolite bioleaching. Strong adhesion of bacteria to the surface of the carrolite grains was observed during early bioleach stages and playing an important role in the process. This phenomenon would cause the release of ferrous ions in solution by a direct contact mechanism on the one hand and causing oxidation of ferrous ions, elemental sulfur or sulfur compounds on the other hand, compounds which would accumulate at the surface of carrolite grains. The number of free bacteria in solution increases thus promoting the oxidation of ferrous to ferric ions, which oxidize the mineral through indirect mechanism. The number of free bacteria in solution and that of attached bacteria became constant over time, suggesting a cooperative mechanism of carrolite bioleaching. Finally, a statistical study of bioleaching of polymetallic concentrate from Kamoya deposit by Taguchi methodology and analysis of variance (ANOVA) was used to investigate the effect of different physicochemical parameters (initial pH, temperature, agitation, pulp density and duration of bioleaching) on the process efficiency. The results obtained from this statistical approach showed the possibility of bioleaching application as an alternative technique for treatment of the polymetallic sulphide ores of the Katanga copperbelt in Democratic Republic of Congo (DRC) but further investigation using thermophilic bacteria should be considered to improve metal dissolution. [less ▲]

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See detailREDI: budgets de référence pour une vie digne, une application web
Cornelis, Ilse; Peeters, Nele; Reynaert, Jean-François ULg et al

Report (2012)

En résumé, l’application web REDI permet d’utiliser un cadre de référence uniforme tout en calculant un budget adapté au bénéficiaire. En outre, cet outil peut être un guide pour obtenir un aperçu des ... [more ▼]

En résumé, l’application web REDI permet d’utiliser un cadre de référence uniforme tout en calculant un budget adapté au bénéficiaire. En outre, cet outil peut être un guide pour obtenir un aperçu des dépenses et revenus de la personne et a prouvé sa valeur éducative dans le cadre d’accompagnements individuels des clients. REDI peut contribuer à une plus grande prise de conscience sur le besoin d’uniformité existant au sein des CPAS auprès des assistants sociaux et des conseillers pour l’octroi de soutien financier supplémentaire. En outre, l’utilisation des budgets de référence contribue à ce que les assistants sociaux et conseillers comprennent mieux ce qui est nécessaire pour vivre dans la dignité, et participer pleinement à la vie en société. Espérons que sur le long terme, cela puisse modifier les politiques d’aide sociale et permettre une société plus inclusive. [less ▲]

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See detailInitiation à ArcGIS - Travaux pratiques sur les Systèmes d'Information Géographique - SIG
Denis, Antoine ULg

Learning material (2012)

Introduction to ArcGIS (GIS) manual for beginners with data

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See detailFuture surface mass balance contribution of the Antarctic ice-sheet to sea level rise
Agosta, Cécile ULg; Fettweis, Xavier ULg; Krinner, Gerhard et al

Scientific conference (2012, December 04)

Most of the IPCC-AR4 global circulation models predict an increase of the Antarctic Surface Mass Balance (SMB) during the 21st century that would mitigate global sea level rise. High-resolution modeling ... [more ▼]

Most of the IPCC-AR4 global circulation models predict an increase of the Antarctic Surface Mass Balance (SMB) during the 21st century that would mitigate global sea level rise. High-resolution modeling is necessary to adequately capture the Antarctic SMB, that is why we present here a downscaling method leading to 15-km SMB resolution for century time-scales over Antarctica. Our first results show that a higher resolution induce at the same time more run-off but a significantly higher mitigation of sea level rise for the next centuries. [less ▲]

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See detailLiquidity Shocks and Global Imbalances
Artige, Lionel ULg

Conference (2012, December 04)

Detailed reference viewed: 5 (3 ULg)