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See detailHow the debate on the protection of IDPs could inform the debate on the protection of environmental migrations
Gemenne, François ULg; Brücker, Pauline

Conference (2012, December 06)

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See detailLiquidity Shocks and Global Imbalances
Artige, Lionel ULg

Conference (2012, December 04)

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See detailSurvival analysis: finding relevant epistatic SNP pairs using Model- Based Multifactor Dimensionality Reduction
Van Lishout, François ULg; Vens, Céline; Urrea, Victor et al

Conference (2012, December 03)

Analyzing the combined effects of genes (and/or environmental factors) on the development of complex diseases is quite challenging, both from the statistical and computational perspective, even using a ... [more ▼]

Analyzing the combined effects of genes (and/or environmental factors) on the development of complex diseases is quite challenging, both from the statistical and computational perspective, even using a relatively small number of genetic and non-genetic exposures. Several data-mining methods have been proposed for interaction analysis, among them, the Multifactor Dimensionality Reduction Method (MDR). Model-Based Multifactor Dimensionality Reduction (MB-MDR), a relatively new dimensionality reduction technique, is able to unify the best of both nonparametric and parametric worlds, and has proven its utility in a variety of theoretical and practical settings. Until now, MB-MDR software has only accommodated traits that are measured on a binary or interval scale. Time-to-event data could therefore not be analyzed with the MB-MDR methodology. MB-MDR-3.0.0 overcomes this shortcoming of earlier versions. We show the added value of MB-MDR for censored traits by comparing the implemented strategies with more classical methods such as those based on a parametric regression paradigm. The simulation results are supplemented with an application to real-life data. [less ▲]

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See detailLa maladie périnéale chez l'enfant porteur d'une MICI
COIMBRA MARQUES, Carla ULg

Conference (2012, December 03)

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See detailCassini UVIS observations of Titan nightglow spectra
Ajello, Joseph M.; West, Robert A.; Gustin, Jacques ULg et al

in Journal of Geophysical Research. Space Physics (2012), 117

In this paper we present the first nightside EUV and FUV airglow limb spectra of Titan showing molecular emissions. The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed photon emissions of Titan's ... [more ▼]

In this paper we present the first nightside EUV and FUV airglow limb spectra of Titan showing molecular emissions. The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed photon emissions of Titan's day and night limb-airglow and disk-airglow on multiple occasions, including during an eclipse observation. The 71 airglow observations analyzed in this paper show EUV (600-1150 Å) and FUV (1150-1900 Å) atomic multiplet lines and band emissions arising from either photoelectron induced fluorescence and solar photo-fragmentation of molecular nitrogen (N[SUB]2[/SUB]) or excitation by magnetosphere plasma. The altitude of the peak UV emissions on the limb during daylight occurred inside the thermosphere at the altitude of the topside ionosphere (near 1000 km altitude). However, at night on the limb, a subset of emission features, much weaker in intensity, arise in the atmosphere with two different geometries. First, there is a twilight photoelectron-excited glow that persists with solar depression angle up to 25-30 degrees past the terminator, until the solar XUV shadow height passes the altitude of the topside ionosphere (1000-1200 km). The UV twilight glow spectrum is similar to the dayglow but weaker in intensity. Second, beyond 120° solar zenith angle, when the upper atmosphere of Titan is in total XUV darkness, there is indication of weak and sporadic nightside UV airglow emissions excited by magnetosphere plasma collisions with ambient thermosphere gas, with similar N[SUB]2[/SUB] excited features as above in the daylight or twilight glow over an extended altitude range. [less ▲]

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See detailRetrospective Analysis of a Listeria monocytogenes Contamination Episode in Raw Milk Goat Cheese Using Quantitative Microbial Risk Assessment tools
Delhalle, Laurent ULg; Ellouze, Mariem; Yde, Marc et al

in Journal of Food Protection (2012), 75(12), 2122-2135

In 2005, the Belgian authorities reported a Listeria monocytogenes contamination episode in cheese made from raw goat's milk. The presence of an asymptomatic shedder goat in the herd caused this ... [more ▼]

In 2005, the Belgian authorities reported a Listeria monocytogenes contamination episode in cheese made from raw goat's milk. The presence of an asymptomatic shedder goat in the herd caused this contamination. On the basis of data collected at the time of the episode, a retrospective study was performed using an exposure assessment model covering the production chain from the milking of goats up to delivery of cheese to the market. Predictive microbiology models were used to simulate the growth of L. monocytogenes during the cheese process in relation with temperature, pH, and water activity. The model showed significant growth of L. monocytogenes during chilling and storage of the milk collected the day before the cheese production (median increase of 2.2 log CFU/ml) and during the addition of starter and rennet to milk (median increase of 1.2 log CFU/ml). The L. <br /><br />monocytogenes concentration in the fresh unripened cheese was estimated to be 3.8 log CFU/g (median). This result is consistent with the number of L. monocytogenes in the fresh cheese (3.6 log CFU/g) reported during the cheese contamination episode. A variance-based method sensitivity analysis identified the most important factors impacting the cheese contamination, <br /><br />and a scenario analysis then evaluated several options for risk mitigation. Thus, by using quantitative microbial risk assessment tools, this study provides reliable information to identify and control critical steps in a local production chain of cheese made from raw goat's milk. [less ▲]

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See detailLa collecte de l'information. Pour qui ? Pourquoi ? Comment ?
Claustriaux, Jean-Jacques ULg

in Notes de Statistique et d'Informatique (2012), (3), 7

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See detailThe usefulness of CPTs for deterministic, spatially heterogeneous, large-scale aquitard parametrisation
Rogiers, Bart; Mallants, Dirk; Batelaan, Okke et al

in Oswald, S.E.; Kolditz, O.; Attinger, S. (Eds.) Models - Repositories of Knowledge (2012, December)

Aquitards can be effectively parameterised and incorporated in a groundwater flow model by using standard cone penetration tests (CPTs). Several conceptually different realizations of an aquitard’s ... [more ▼]

Aquitards can be effectively parameterised and incorporated in a groundwater flow model by using standard cone penetration tests (CPTs). Several conceptually different realizations of an aquitard’s hydraulic conductivity field were evaluated based on: (i) conventional methods of soil behaviour type classification, (ii) recent relationships from the literature, and (iii) novel site-specific relations with hydraulic conductivity. We show that use of most of these CPT-based hydraulic conductivity estimations in groundwater flow modelling effectively enhance model performance based on absolute head values and gradients across the aquitard. Conceptual models that considered a spatially heterogeneous hydraulic conductivity for the aquitard performed better than the reference case with a uniform aquitard hydraulic conductivity. However, the hydraulic conductivity of thin heavy clay lenses, characteristic of the aquitard present in our study area, cannot be captured using these continuum approaches. The latter leads to a bias in the direct hydraulic conductivity predictions; an alternative is to invoke inverse modelling with the heterogeneous parameter fields. To address this issue, the concept of the boundary energy associated with the CPT signal is also introduced for characterising the presence of heavy clay lenses. Overall, the CPT-based concepts provide more accurate, robust, and high-resolution data-based parameterisation of the studied aquitard. [less ▲]

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See detailModel-based glycemic control in critical care
Pretty, Christopher ULg; Penning, Sophie ULg; Le Compte, Aaron J. et al

Poster (2012, December)

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See detailGrimm'sche Märchen im Figurentheater
Viehöver, Vera ULg

in Das andere Theater (2012), 82(3), 4-5

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See detail"Hase und Igel" - antastbar!
Viehöver, Vera ULg

in Das andere Theater (2012), 82(3), 22-24

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See detailAcceleration of the convergence of a non-overlapping domain decomposition method by an approximate deflation technique for high-frequency wave propagation
Vion, Alexandre ULg; Thierry, Bertrand; Geuzaine, Christophe ULg

in Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012) (2012)

The analysis of a non-overlapping domain decom- position method with optimized transmission conditions, applied to a simplified 1-D problem discretized by finite elements, is performed to better ... [more ▼]

The analysis of a non-overlapping domain decom- position method with optimized transmission conditions, applied to a simplified 1-D problem discretized by finite elements, is performed to better understand the spectral properties of the method. An approximate deflation preconditioner is then introduced to modify the spectrum of the iteration operator, and speed up the convergence of the GMRES algorithm used to solve the substructured problem. [less ▲]

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See detailParticipatory approaches for evaluating surveillance systems: insights from a training- related study from Vietnam
Antoine-Moussiaux, Nicolas ULg; Vu, M.Q. Giao; Delabouglise, Alexis et al

Conference (2012, December)

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See detailThe social dimension of animal health surveillance system: an interdisciplinary approach of social pressure in the process of disease reporting in Northern Thailand.
Binot, Aurélie; Valeix, Sophie; Kovitvadhi, Attawit et al

Conference (2012, December)

In the framework of the CIRAD REVASIA research program, aimed at the improvement of methods for the evaluation of animal health surveillance systems, a interdisciplinary approach has been designed for ... [more ▼]

In the framework of the CIRAD REVASIA research program, aimed at the improvement of methods for the evaluation of animal health surveillance systems, a interdisciplinary approach has been designed for addressing surveillance‘s social factors at local level. To that purpose, methodological inputs from epidemiology, economics and anthropology have been merged together in order to provide an innovative methodological pathway for the assessment and quantification of these factors at community level. Regarding the onset of the desired interdisciplinary approach, the first step was to bring the researchers into several brainstorming sessions aimed at defining a shared scientific and operational objective for this study. It was decided to settle two field sites in two different political, economical and social contexts: one in Vietnam and one in Thailand. Then, the next step was to bring all the concerned researchers into a common workshop dealing with participatory approaches applied to epidemiology. One of the main outcomes was to allow for the handling by the investigators of basic participatory investigation and visualization tools (mapping, diagrams, proportional piling, etc.) and qualitative data gathering. Then, the two field inquiry’s protocols were designed on the economical process at play in the field of livestock and animal health and the social and socio-­‐political dynamics at the community level. This communication will focus on the Thailand study, showing how an anthropology-­‐based study of the social, economical and political process in the community can highlight behavior rules in the context of animal diseases reporting. Indeed, the decision-­‐making process for reporting or not reporting a disease has been considered beyond the individual, as the result of a body of community influences referring to social factors. Thus, we have gone through a better understanding of (1) the community’s functioning patterns, (2) power relationships at play and social stakeholders’ networks and interactions (economical stakes, land tenure issues, political control etc.). In parallel, we showed some trends for health management practices and knowledge. The outputs of this study were an analysis of the social pressure that the stakeholders are subjected to in the framework of animal health management, a better understanding of the animal health information spreading scheme, and a typology of social stakeholders regarding surveillance. The research process, even if focusing on social and anthropological dynamics at play was interdisciplinary from the very beginning, merging together qualitative participatory investigation methods from sociology and economics, modeling and computer sciences, and epidemiology. Thus, pathways of individual motivation for reporting, based on social types, have been provided in order to highlight behavior rules associated to animal health surveillance systems. [less ▲]

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See detailDéveloppement d’une ailette d’obus en composite magnésium renforcé de fibres de carbone
Montrieux, Henri-Michel ULg; Mertens, Anne ULg; Lecomte-Beckers, Jacqueline ULg

Report (2012)

This report describes the accomplished breakthrough for the manufacturing of long carbon fibres reinforced magnesium alloy (AZ91). Infiltration can be performed with non-equilibrium conditions such as ... [more ▼]

This report describes the accomplished breakthrough for the manufacturing of long carbon fibres reinforced magnesium alloy (AZ91). Infiltration can be performed with non-equilibrium conditions such as fibres preheating, high liquid compacting pressure and low contact times. Thanks to specific TEOS sol/gel treatment, the reached fibre rate is 60 vol.% and the measured Young's modulus of the composite is ca. 110 GPa. The presence of defects including fibre yarns misorientation, unreinforced areas seems very detrimental to the bending properties. Other advanced infiltration techniques with Al pretreatment (K2ZrF6) of fibres is also considered. [less ▲]

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See detailMartian thermospheric temperatures retrieved from CO2 + SPICAM dayglow measurements
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Bougher, S. et al

Conference (2012, December)

A large dataset of dayside grazing limb CO2+ observations performed by the SPICAM (Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars) instrument on board Mars Express is analyzed ... [more ▼]

A large dataset of dayside grazing limb CO2+ observations performed by the SPICAM (Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars) instrument on board Mars Express is analyzed to retrieve Martian thermospheric temperature, as well as its variation with solar activity, season and latitude. The method permits to retrieve the temperature from the scale height of the CO2+ emission. We also present puzzling features such as limb profiles exhibiting multiple peaks and their characteristics. We furthermore study the behavior of the main emission peak of the CO2+ vertical emission profiles. The CO2+ emission at 289 nm arises from the relaxation of the CO2+* molecule in the B2Σ+ state to the X2Π state. CO2+* molecules are mainly produced in the Martian dayside through photoionisation and photoelectron impact. The CO2+ emission exhibits features that constrain the temperature and density vertical profiles of CO2. Comparisons of retrieved temperatures are made with corresponding simulations from the coupled MGCM-MTGCM. We also use a Monte-Carlo code to model the observed intensity limb profiles. [less ▲]

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See detailMass transport in carbon gels with tuned porosity
Job, Nathalie ULg

in Spanish Carbon Group Bulletin (2012)

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See detailCOSMOGRAIL: Measuring Time Delays of Gravitationally Lensed Quasars to Constrain Cosmology
Tewes, Malte; Courbin, Frédéric; Meylan, Georges et al

in The Messenger (2012)

COSMOGRAIL is a long-term programme for the photometric monitoring of gravitationally lensed quasars. It makes use of several medium-size telescopes to derive long and well-sampled light curves of lensed ... [more ▼]

COSMOGRAIL is a long-term programme for the photometric monitoring of gravitationally lensed quasars. It makes use of several medium-size telescopes to derive long and well-sampled light curves of lensed quasars, in order to measure the time delays between the quasar images. These delays directly relate to the Hubble constant H0, without any need for secondary distance calibrations. COSMOGRAIL was initiated in 2004, and has now secured almost a decade of data, resulting in cosmological constraints that are very complementary to other cosmological probes. [less ▲]

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