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See detailImprovement and validation of milk fatty acid predictions using mid-infrared spectrometry
Soyeurt, Hélène ULg; McParland, Sinead; Berry, Donagh et al

in Proceedings of the Bristish Society of Animal Science and the Agricultural Research Forum (2010)

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See detailDeveloping the HRH Policy and Plan in Mali
Paul, Elisabeth ULg; Samaké, Salif

Conference (2010)

Context: Deficient HRH management – especially insufficient training and motivation, and adverse distribution of qualified staff countrywide, at the expense of poor and remote areas – has been identified ... [more ▼]

Context: Deficient HRH management – especially insufficient training and motivation, and adverse distribution of qualified staff countrywide, at the expense of poor and remote areas – has been identified for over a decade as one major constraint for the implementation of Mali's national health policy. Main objective: The HRH policy aims to define a coherent framework for the ministry of health (MoH) and its partners in order to ensure the harmonious development, distribution, management and motivation of health staff so as to ultimately improve health results. The policy is translated into an operational plan dealing specifically with training, recruitment, motivation, and career management. Methodology: The HRH policy and plan were developed by a core team under the leadership of the Planning Department of the MoH, with the involvement from other departments of the MoH, the ministries in charge of finance (MoF) and civil service (MoCS), and donors. After analyzing existing studies and data, the diagnosis over the major problems to be tackled was done. This allowed identifying the main orientations of the policy, which were then translated into strategies and interventions, and then costed. Once the policy and plan have been drafted by the core team, they have been circulated to all departments and partners and discussed in several meetings with different stakeholders at central level. After integrating comments from these meetings, the MoH organized a validation workshop with very broad participation (including the operational level, private sector, and civil society) so as to ensure ownership. Final amendments were negotiated with the MoF and MoCS in order to be adopted as a national policy by the Counsel of Ministers by the end of 2009. Results: The HRH policy and plan now benefit from wide political support by major stakeholders. Yet, implementation still has been delayed because of the management modalities at operational level still need to be definitively agreed upon. Conclusion: The inclusive development process has been necessary to move on with the complex and highly sensitive issue of HRH management, and to get the support from MoF, MoSC and donors who are supposed to contribute to its financing. [less ▲]

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See detailSelective epitaxial growth of III-V semiconductor heterostructures on Si substrates for logic applications
Nguyen, Ngoc Duy ULg; Wang, Gang; Waldron, Niamh et al

in 218th ECS Meeting, 2010 (2010)

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See detailBerichte aus der Fremde. Unbehaustheit als Grundmotiv von Joseph Roths Reisereportagen und Reiseschilderungen
Küpper, Achim ULg

in Eicher, Thomas (Ed.) Joseph Roth und die Reportage (2010)

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See detailCentral neuromodulation in cluster headache patients treated with occipital nerve stimulators: A PET study
Magis, Delphine ULg; Bruno, Marie-Aurélie ULg; Fumal, Arnaud ULg et al

in Acta Neurologica Belgica (2010), 110(Suppl 1), 17

OBJECTIVES: Use functional brain imaging to explore activity changes in centres involved in trigeminal pain processing and control before and after occipital neurostimulation in drug-resistant chronic ... [more ▼]

OBJECTIVES: Use functional brain imaging to explore activity changes in centres involved in trigeminal pain processing and control before and after occipital neurostimulation in drug-resistant chronic cluster headache patients. BACKGROUND: Occipital nerve stimulation (ONS) provides relief to about 60% of patients suffering from drug-resistant chronic cluster headache (drCCH). Its mode of action, however, remains elusive, but the long latency to meaningful effect suggests that ONS induces slow neuromodulation. METHODS: Ten drCCH patients underwent an 18FDG-PET scan after ONS durations varying between 0 and 30 months. All were scanned with ongoing ONS (ON) and with the stimulator switched OFF. RESULTS: After 6-30 months of ONS, 3 patients were pain free and 4 had a ≥ 90% reduction of attack frequency (responders). In patients overall compared to controls, several areas of the pain matrix were hypermetabolic: ipsilateral hypothalamus, midbrain and ipsilateral lower pons. All normalized after ONS, except the hypothalamus. Switching ON or OFF the stimulator had little influence on brain glucose metabolism. The perigenual anterior cingulate cortex (PACC) was hyperactive in ONS responders compared to non-responders. INTERPRETATION AND CONCLUSIONS: Metabolic normalization in the pain neuromatrix and lack of short-term changes induced by the stimulation support the hypothesis that ONS acts in drCCH through slow neuromodulatory processes. Selective activation in responders of PACC, a pivotal structure in the endogenous opioid system, suggests that ONS may restore balance within dysfunctioning pain control centres. That ONS is nothing but a symptomatic treatment might be illustrated by the persistent hypothalamic hypermetabolism which could explain why autonomic attacks may persist despite pain relief and why cluster attacks recur shortly after stimulator arrest. [less ▲]

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See detailTime-Symmetric Discretization of the Harmonic Oscillator
Antippa, Adel F.; Dubois, Daniel ULg

in Dubois, Daniel (Ed.) COMPUTING ANTICIPATORY SYSTEMS (2010)

We explicitly and analytically demonstrate that simple time-symmetric discretization of the harmonic oscillator (used as a simple model of a discrete dynamical system), leads to discrete equations of ... [more ▼]

We explicitly and analytically demonstrate that simple time-symmetric discretization of the harmonic oscillator (used as a simple model of a discrete dynamical system), leads to discrete equations of motion whose solutions are perfectly stable at all time scales, and whose energy is exactly conserved. This result is important for both fundamental discrete physics, as well as for numerical analysis and simulation. [less ▲]

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See detailHet Nederlandse literatuuronderwijs in de Waalse provincies als prescriptieve Landeskunde (1817-1900)
Steyaert, Kris ULg

in Konst, Jan; Hüning, Matthias; Holzhey, Tanja (Eds.) Neerlandistiek in Europa: Bijdragen tot de geschiedenis van de universitaire neerlandistiek buiten Nederland en Vlaanderen (2010)

This article focuses on three nineteenth-century literary histories written for French-speaking students of Dutch. The histories illustrate a concern on the part of the authors (J.F.X. Würth, F.A ... [more ▼]

This article focuses on three nineteenth-century literary histories written for French-speaking students of Dutch. The histories illustrate a concern on the part of the authors (J.F.X. Würth, F.A. Snellaert, and J. Stecher) not only with the teaching of Dutch literature and the development of a solid Dutch literary tradition but also with the presentation of their material in keeping with an underlying ideological framework. In each case their presentation was designed to reinforce a particular view of country and culture and of the respective roles of the Dutch, Flemish and Walloon peoples in the creation of a one-nation state. The differences between them reflect a change in the significance of Dutch literature as a result of political developments, leading in turn to a paradigm shift in the teaching of the subject at university. An analysis of the didactic aims and principles underlying the literary histories written by Würth, Snellaert and Stecher reveals the extent to which political allegiances and nationalist considerations determined their selection criteria and the organisation of their subject matter. Not surprisingly, the contemporary critical response to these study books shows a similar ideological bias. [less ▲]

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See detailEstimation of tidal boundary conditions and surface winds by assimilation of high-frequency radar surface currents in the German Bight
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Gurgel, Klaus-Werner et al

Conference (2010)

Numerical ocean models are affected by errors of various origins: errors in the initial conditions, boundary conditions and atmospheric forcings, uncertainties in the turbulence parametrization and ... [more ▼]

Numerical ocean models are affected by errors of various origins: errors in the initial conditions, boundary conditions and atmospheric forcings, uncertainties in the turbulence parametrization and discretization errors. In data assimilation, observations are used to reduce the uncertainty in the model solution. Ensemble-based assimilation schemes are often implemented such that the expected error of the model solution is minimized. It is shown that the observations can also be used to obtain improved estimates of the, in general, poorly known boundary conditions and atmospheric forcings. An ensemble smoother scheme is presented to assimilate high-frequency (HF) radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of dynamically realistic tidal boundary conditions, a cost function is formulated which is directly related to the probability of each perturbation. This cost function ensures that the perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimensional General Estuarine Ocean Model (GETM). Optimized boundary values are obtained using all observations within the assimilation period using the covariances of the ensemble simulation. The approach acts like a smoother scheme since past and future observations are taken into account. The final analysis is obtained by rerunning the model using the optimal perturbation of the boundary conditions. The analyzed model solution satisfies thus the model equations exactly and does not suffer from spurious adjustments often observed with sequential assimilation schemes. Model results are also compared to independent tide gauge data. The assimilation also reduces the model error compared to those sea level observations. The same scheme is also used to correct surface winds. Surface winds are crucial for accurately modeling the marine circulation in coastal waters. The method is validated directly by comparing the analyzed wind speed to in situ measurements and indirectly by assessing the impact of the corrected winds on sea surface temperature (SST) relative to satellite SST. [less ▲]

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See detailInfluence de la modalité visuelle sur l'évaluation acoustique de salles
Defays, Aurore ULg; Safin, Stéphane ULg; Billon, Alexis ULg et al

in Actes du 45ème congrès de la Société d'ergonomie de langue française. (2010)

Le projet AURALIAS vise à développer un environnement immersif permettant le travail coopératif entre architectes et acousticiens. Ce système associe donc un rendu sonore 3D et une vue du modèle 3D de la ... [more ▼]

Le projet AURALIAS vise à développer un environnement immersif permettant le travail coopératif entre architectes et acousticiens. Ce système associe donc un rendu sonore 3D et une vue du modèle 3D de la salle considérée. Dans ce cadre, nous nous intéressons à l’impact de l’image projetée sur le jugement subjectif de l’acoustique de la salle. 70 sujets ont été confrontés à une tâche de jugement du degré de réverbération d’un extrait sonore dans une situation contrôle (sans image) puis dans une situation expérimentale avec, pour la première partie des sujets, une image visant à soutenir le jugement (cohérente avec le son), pour la deuxième partie, une image « distractrice », et pour la troisième partie, sans image (groupe témoin). Nos résultats montrent une influence positive des images évocatrices et pas d’effet des images distractrices. [less ▲]

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See detailFlourishing Aphrodite: an overview in recent scholarship
Pirenne-Delforge, Vinciane ULg

in Smith, Amy; Pickup, Sadie (Eds.) Companion to Aphrodite (2010)

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See detailThe Scientific Representation of Temporal Stratification
Dondero, Maria Giulia ULg

in Semiotics 2009 Proceeding Volume of 34th Annual Semiotic Society of America (SSA) Meeting (2010)

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See detailTotal Error Concept in Validation of Viral Activity in Cell Cultures
Gibein, N.; Rozet, Eric ULg

Conference (2010)

Due to the high variability inherent of experimental recipients, validating biological methods is often a complex exercise, and following ICH Q2R1 recommendations is not always feasible and/or meaningful ... [more ▼]

Due to the high variability inherent of experimental recipients, validating biological methods is often a complex exercise, and following ICH Q2R1 recommendations is not always feasible and/or meaningful. Linking systematic error and random error to obtain a unique criterion, as defined in ISO guideline, could be of interest to capture the total variability in biological assays. In this paper, the use of Total Error concept in the validation of biological assays was for the first time investigated and compared to a conventional interpretation of the ICH guideline. Both decision methodologies concluded that the assaywas valid from 2.13 to 5.83 log10(CCID50/ml). However, only the Total Error approach using accuracy profile as decision tool allowed to guarantee that accurate and reliable results will be obtained during the future routine application of the assay. In addition, the risk to obtain out of acceptance limits results was estimated using this approach and was found out to be at the most 3.1% irrespective of the concentration level, thus demonstrating the reliability of the biological assay. [less ▲]

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See detailMetalub – A Slab Method software for the numerical simulation of mixed lubrication regime. Application to cold rolling
Carretta, Yves ULg; Stephany, Antoine; Legrand, Nicolas et al

in ICTMP 2010 - International Conference on Tribology in Manufacturing processes (2010)

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See detailAxions et polarisation des quasars
Payez, Alexandre ULg

in Barillon, Pierre (Ed.) Journées Jeunes Chercheurs 2008 (2010)

[Français] Je présente rapidement l'objet de mes recherches et tente ensuite l'exercice consistant à exposer - le plus clairement possible - les idées et considérations physiques ayant amené à la ... [more ▼]

[Français] Je présente rapidement l'objet de mes recherches et tente ensuite l'exercice consistant à exposer - le plus clairement possible - les idées et considérations physiques ayant amené à la proposition de l'existence de l'axion. [less ▲]

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See detailTrends of CO2, CH4 and N2O over 1985-2010 from high-resolution FTIR solar observations at the Jungfraujoch station
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Zander, Rodolphe ULg et al

in Geophysical Research Abstracts (2010), 12(EGU2010-15418-2),

Two state-of-the-art Fourier Transform Infrared (FTIR) spectrometers are operated at the Jungfraujoch station (46.5ºN, 8.0ºE, 3580m asl) within the framework of the Network for the Detection of ... [more ▼]

Two state-of-the-art Fourier Transform Infrared (FTIR) spectrometers are operated at the Jungfraujoch station (46.5ºN, 8.0ºE, 3580m asl) within the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). The earliest FTIR observations have been obtained there in 1984. Since then, regular recordings of high-resolution solar absorption spectra have been performed at that site, under clear-sky conditions, allowing to collect almost 29000 observations relevant to the present communication. We present time series of three greenhouse gases targeted by the Kyoto Protocol: CO2, CH4 (and its isotopologue 13CH4) and N2O. These data sets have been obtained with the SFIT-2 algorithm which implements the Optimal Estimation Method of Rodgers (1990). This allows retrieving total columns of the target gases as well as information on their distribution with altitude. For the methane isotopologues and N2O, a Tikhonov L1 regularization scheme has been applied, as part of an harmonization effort carried out within the European HYMN project (see also Dils et al, 2010; Foster et al., 2010). Trends –and their associated uncertainties– characterizing these long series as well as the seasonal modulations have been determined with a statistical tool using bootstrap resampling (Gardiner et al., 2008). Trend values will be presented and critically discussed; in particular, we will investigate if significant changes in the rate of accumulations of these four atmospheric gases occurred over the last 25 years. Numerous additional greenhouse gases are accessible to the FTIR technique. Examples of such trend studies are reported at the EGU General Assembly by Mahieu et al. (2010) and Rinsland et al. (2010). [less ▲]

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See detailNatural and Artificial Intelligence, Language, Consciousness, Emotion, and Anticipation
Dubois, Daniel ULg

in Dubois, Daniel (Ed.) COMPUTING ANTICIPATORY SYSTEMS (2010)

The classical paradigm of the neural brain as the seat of human natural intelligence is too restrictive. This paper defends the idea that the neural ectoderm is the actual brain, based on the development ... [more ▼]

The classical paradigm of the neural brain as the seat of human natural intelligence is too restrictive. This paper defends the idea that the neural ectoderm is the actual brain, based on the development of the human embryo. Indeed, the neural ectoderm includes the neural crest, given by pigment cells in the skin and ganglia of the autonomic nervous system, and the neural tube, given by the brain, the spinal cord, and motor neurons. So the brain is completely integrated in the ectoderm, and cannot work alone. The paper presents fundamental properties of the brain as follows. Firstly, Paul D. MacLean proposed the triune human brain, which consists to three brains in one, following the species evolution, given by the reptilian complex, the limbic system, and the neo-cortex. Secondly, the consciousness and conscious awareness are analysed. Thirdly, the anticipatory unconscious free will and conscious free veto are described in agreement with the experiments of Benjamin Libet. Fourthly, the main section explains the development of the human embryo and shows that the neural ectoderm is the whole neural brain. Fifthly, a conjecture is proposed that the neural brain is completely programmed with scripts written in biological low-level and high-level languages, in a manner similar to the programmed cells by the genetic code. Finally, it is concluded that the proposition of the neural ectoderm as the whole neural brain is a breakthrough in the understanding of the natural intelligence, and also in the future design of robots with artificial intelligence. [less ▲]

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See detailSpatio-temporal patterns of preys and wastes moved by ants within the nests
Diez, Lise; Lejeune, Philippe ULg; Deneubourg, Jean-Louis et al

Poster (2010)

Living in society in a restricted and confined nest implies important organisational issues. Ants have to control food supply for the whole colony as well as nest defence but they also have to manage ... [more ▼]

Living in society in a restricted and confined nest implies important organisational issues. Ants have to control food supply for the whole colony as well as nest defence but they also have to manage everyday life tasks such as waste rejection. Within the nest, ants are faced with different items that have to be used or rejected regarding colony needs. We study whether they can discriminate between three types of items (building material, nestmate cadaver or prey) and accordingly adapt the spatio-temporal distribution of these items. Therefore, we used colonies of the ant Myrmica rubra settled in a 2-dimensional space and introduced different items in the nest centre. We show that each item triggers a specific cascade of behaviour. We observed important differences in rejection time: building items were removed within a few minutes and cadavers after a few hours while preys could be kept in the nest for a day or more. Furthermore, the movement of items by ants leads to specific spatio-temporal patterns. Building items were removed with a straight trajectory from the centre to the exit of the nest. Ant cadavers that could bear pathogens showed a trajectory avoiding and moving away from larvae that are potentially more sensitive to diseases. The moving of preys headed an oscillating pattern: these items were alternatively taken on larvae for consumption and then moved away from them, until final rejection. This specific pattern may be due to the coupled effects of groups of ants acting alternatively to feed larvae and reject waste. In the case of cadavers and building items, only undertaking ants may be active. These results suggest that each ant is able to discriminate and interact with each other leading at the collective level to a complex cascade of behaviour. [less ▲]

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See detailThermodynamic analysis of the interaction of surfactin, a bacterial lipopeptide, to lipid vesicles
Deleu, Magali ULg

in 13th International Conference on organized molecular films (2010)

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See detailForensic science technique applied for calculation of kinship index
Bömcke, Elisabeth ULg; Gengler, Nicolas ULg

Poster (2010)

Implementing conservation strategies needs the knowledge of relationships inside the concerned population. The aim of this study was to find tools to help scientists and breeders to manage endangered ... [more ▼]

Implementing conservation strategies needs the knowledge of relationships inside the concerned population. The aim of this study was to find tools to help scientists and breeders to manage endangered populations or populations with missing pedigree information. The animal genetics literature often seems unaware of relevant developments in human genetics (and conversely). In this study, an approach called Familial Searching was tested. This is used in forensic science, in addition to matching DNA evidence directly to criminal profiles, to search for people (present in a database) who are related to an individual that left DNA evidence at a scene of crime. This method is based on the calculation of likelihood ratios (LR) between genotype of an individual and genotypes of each other individuals of the database. In order to decrease the number of comparisons, the available pedigree information was used as ‘local’ prior information, i.e. relating to specific pairs of individuals. General knowledge about the studied population (e.g., generation interval, sexual maturity) was considered as ‘global’ prior information. Including prior information reduced the number of comparisons from over 50%. Results showed that the parents were always classified into the 4 highest LR. This method simplified parentage verifications, it allowed the detection of 90% of false parentage (LR=0). It also allowed to create new links in the pedigree through detection of unregistered parents. The method was tested on the Skyros pony, an indigenous Greek breed. For this breed, partial pedigree information was available, and 99 individuals were genotyped at 16 microsatellite loci. The method allowed to check about 2500 possible parent-child combinations, three registered parentages were considered as incorrect and one non-recorded parentage was detected. The method will now be tested on other breed and with other markers, e.g. SNPs. [less ▲]

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See detailSubspace-based Methods for Machinery Analysis and Monitoring
Nguyen, Viet Ha ULg; Rutten, Christophe ULg; Golinval, Jean-Claude ULg

Conference (2010)

The objective of this presentation is to address the problem of structural damage detection or fault diagnosis in mechanical systems using subspace-based methods. Different methods are reviewed starting ... [more ▼]

The objective of this presentation is to address the problem of structural damage detection or fault diagnosis in mechanical systems using subspace-based methods. Different methods are reviewed starting from Principal Component Analysis (PCA) also known as Proper Orthogonal Decomposition (POD) of time responses. PCA is known as an efficient method for extracting modal features of linear structures from output-only measurements. Those features define a subspace which characterizes the dynamical behavior of the structure. It becomes than possible to detect structural damage by comparing a reference subspace (obtained from the healthy structure) with current subspaces on the basis of the concept of angles between subspaces. Other damage indexes based on statistics may also be used. One of the drawbacks of PCA is the need of several sensors. If the number of sensors is too small, modal identification and/or damage detection may not be performed in good conditions using PCA. An alternative PCA-based method named Null Subspace Analysis (NSA) may then be used. The NSA method generates data by means of block Hankel matrices and is proven to be efficient when the number of available sensors is small or even reduced to one sensor only. However, when damage activates nonlinearity, the detection problem may necessitate methods which are more sensitive to nonlinear behaviors. To this purpose, Kernel Principal Component Analysis (KPCA) is a nonlinear extension of PCA built to authorize features with nonlinear dependence between variables. The method is “flexible” in the sense that different kernel functions may be used to better fit the testing data. Industrial applications are presented to illustrate the proposed methods. [less ▲]

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See detailLe cycle de Guillaume d’Orange ou les Aliscans rajeunis
Henrard, Nadine ULg

in Cazanave, Caroline; Houssais, Yvon (Eds.) Grands textes du Moyen Âge à l'usage des petits (2010)

Examen d'une douzaine de versions de récritures de la geste de Guillaume d'Orange parues entre 1905 et 1995 et destinées à la jeunesse

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See detailExtinction debt and colonization credit: When both phenomena are integrated
Piqueray, Julien ULg; Cristofoli, Sara; Bisteau, Emmanuelle et al

Conference (2010)

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the ... [more ▼]

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the creation of an extinction debt in remaining habitat patches. In our study site, it was shown in a previous study that Fragmented habitat patches (area loss since 1965 >80%) exhibited an extinction debt in comparison to Stable habitat patches (area loss since 1965 <80%). However, human activities also created new habitat patches in the landscape and provided therefore opportunities for calcareous grassland plant species to colonize new sites. They also provide opportunities for studying species colonization abilities in the context of habitat restoration. We analyzed species richness in these new patches in comparison to old patches in order to detect colonization credit. When taking as reference Fragmented patches (that exhibit an extinction debt) or all old patches (Fragmented and Stable), we concluded to the occurrence of a colonization credit in New patches. However, when the reference is Stable patches (the less likely to exhibit an extinction debt) alone, no colonization credit could be detected. Moreover, correspondence analysis revealed that New patches were similar to old patches in term of species composition. These results are encouraging for restoration programs. They also showed that the presence of an extinction debt in reference habitats can lead to mistaken conclusion in restoration monitoring. Extinction debt occurrence should be taken into account in the choice of reference habitats for evaluation of restoration success. [less ▲]

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See detailCharacterisation of B1 metallo-beta-lactamase inhibition by VHHs
Sohier, Jean ULg; Laurent, Clémentine ULg; Chevigné, Andy et al

Poster (2010)

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See detailLes concepts de l'égalité et de la diversité
Cornet, Annie ULg

Conference (2010)

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See detailNew Ways of Lemmatizing and Tagging Classical and post-Classical Latin: the LATLEM project of the LASLA
Longrée, Dominique ULg; Poudat, Céline

in Anreiter, Peter; Kienpointner, Manfred (Eds.) Proceedings of the 15th International Colloquium on Latin Linguistics (2010)

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See detailResidual stress measurement in dental prostheses by hole-drilling.
Mainjot, Amélie ULg; Schajer, Gary; Vanheusden, Alain ULg et al

Poster (2010)

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See detailLa place du français dans les identités linguistiques des Belges issus de l’immigration
Lucchini, Silvia ULg; Hambye, Philippe; Forlot, Gilles et al

in Dialogues et Cultures (2010), I(55), 389-402

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See detailOptimized approach to retrieve information on the tropospheric and stratospheric carbonyl sulfide (OCS) vertical distributions above Jungfraujoch from high-resolution FTIR solar spectra
Lejeune, Bernard ULg; Mahieu, Emmanuel ULg; Servais, Christian ULg et al

in Geophysical Research Abstracts (2010), 12(EGU2010-3513),

Carbonyl sulfide (OCS), which is produced in the troposphere from both biogenic and anthropogenic sources, is the most abundant gaseous sulfur species in the unpolluted atmosphere. Due to its low chemical ... [more ▼]

Carbonyl sulfide (OCS), which is produced in the troposphere from both biogenic and anthropogenic sources, is the most abundant gaseous sulfur species in the unpolluted atmosphere. Due to its low chemical reactivity and water solubility, a significant fraction of OCS is able to reach the stratosphere where it is converted to SO2 and ultimately to H2SO4 aerosols (Junge layer). These aerosols have the potential to amplify stratospheric ozone destruction on a global scale and may influence Earth’s radiation budget and climate through increasing solar scattering. The transport of OCS from troposphere to stratosphere is thought to be the primary mechanism by which the Junge layer is sustained during nonvolcanic periods. Because of this, long-term trends in atmospheric OCS concentration, not only in the troposphere but also in the stratosphere, are of great interest. A new approach has been developed and optimized to retrieve atmospheric abundance of OCS from high-resolution ground-based infrared solar spectra by using the SFIT-2 (v3.91) algorithm, including a new model for solar lines simulation (solar lines often produce significant interferences in the OCS microwindows). The strongest lines of the nu3 fundamental band of OCS at 2062 cm-1 have been systematically evaluated with objective criteria to select a new set of microwindows, assuming the HITRAN 2004 spectroscopic parameters with an increase in the OCS line intensities of the nu3band main isotopologue 16O12C32S by 15.79% as compared to HITRAN 2000 (Rothman et al., 2008, and references therein). Two regularization schemes have further been compared (deducted from ATMOS and ACE-FTS measurements or based on a Tikhonov approach), in order to select the one which optimizes the information content while minimizing the error budget. The selected approach has allowed us to determine updated OCS long-term trend from 1988 to 2009 in both the troposphere and the stratosphere, using spectra recorded on a regular basis with Fourier Transform Infrared spectrometers (FTIRs), under clear-sky conditions, at the NDACC site (Network for the Detection of Atmospheric Composition Change, visit http://www.ndacc.org) of the International Scientific Station of the Jungfraujoch (Swiss Alps, 46.5°N, 8.0°E, 3580m asl). Trends and seasonal cycles deduced from our results will be compared to values published in the literature and critically discussed. In particular, we will confirm the recent change in the OCS total column trend, which has become positive since 2002 before undergoing a slowing down over the last years. [less ▲]

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See detailA mid-size city and IYA09: a case study
Nazé, Yaël ULg

Poster (2010)

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See detailAppétence et adhérence des systèmes de réparation : importance de la préparation du support
Courard, Luc ULg

Conference (2010)

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ... [more ▼]

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ainsi que de l’environnement dans lequel le contact est créé. Elle s’exprime habituellement en termes de variations dimensionnelles, de perméabilité et de propriétés chimiques et électrochimiques. Ces propriétés sont évoquées ou développées pour chacun des matériaux mis en présence : rugosité, porosité, cohésion superficielle et eau interstitielle pour le béton ; retrait, fluage, rigidité, absorption capillaire pour les produits de réparation. Trois conditions fondamentales nécessaires et suffisantes au développement de l’adhérence en tant que signe de la compatibilité entre matériaux sont évoquées et illustrées pour le cas particulier de la préparation de surface : sablage, burinage, hydro démolition, marteau-piqueur, … ont un effet spécifique non seulement sur la rugosité, et donc l’accrochage mécanique du système de réparation, mais aussi sur la cohésion de la couche superficielle du béton [less ▲]

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See detailRobust Automatic Target Recognition Using Extra-trees
Pisane, Jonathan ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg et al

in Pisane, Jonathan (Ed.) Robust Automatic Target Recognition Using Extra-trees (2010)

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT image classifier. It uses randomized sub-windows extraction and extremely randomized ... [more ▼]

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT image classifier. It uses randomized sub-windows extraction and extremely randomized trees (extra-trees). This approach requires very little pre-processing of the images, thereby limiting the computational load. It was successfully tested on an extended version of the public standard MSTAR database, that includes targets of interest, false targets, and background clutter. A misclassification rate of about three percent has been achieved. [less ▲]

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See detailLiquid hold-up measurement in Mellapak Plus 752Y packed bed using X-ray tomography
Aferka, Saïd ULg; Viva, Aurora ULg; Brunazzi, Elisabetta et al

in VCIPT (Ed.) Proceedings of 6th World Congress On Industrial Process Tomography (WCIPT6), Beijing, China, 6-9 Septembre 2010 (2010)

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See detailSteel Hollow Columns filled with self compacting Concrete under Fire Conditions
Dotreppe, Jean-Claude ULg; Chu, Thi Binh; Franssen, Jean-Marc ULg

in The third International Congress and Exhibition - Proceedings Disc (2010)

Concrete filled steel hollow section (CFSHS) columns can carry important loads and therefore are used extensively in the construction of high-rise buildings. Steel hollow sections are filled usually with ... [more ▼]

Concrete filled steel hollow section (CFSHS) columns can carry important loads and therefore are used extensively in the construction of high-rise buildings. Steel hollow sections are filled usually with ordinary concrete, but filling problems may arise with small cross sections and dense reinforcement or hollow sections (tubes) surrounding another profile (tube or H section) when the distance between the two profiles is small. For such a configuration, self-compacting concrete can be recommended. Ten columns filled with self-compacting concrete embedding another steel profile have been tested in the Fire Engineering Laboratory of the University of Liege - Belgium. The non linear finite element software SAFIR developed at the University of Liege has been used to simulate the thermal and structural behavior under fire conditions. A good agreement between numerical and experimental results has been obtained. This shows that SAFIR code can predict well the behavior of CFSHS columns and that the properties of self-compacting concrete at high temperatures can be considered to be the same as those of ordinary concrete. Another purpose of this study was to give practical tools to consulting engineers. [less ▲]

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See detailAnts’ survival and waste management in Myrmica rubra nests
Diez, Lise; Lejeune, Philippe ULg; Detrain, Claire

Poster (2010)

Sociality increases risks of disease transmission as genetically related individuals live in a confined environment. Therefore, social insects developed specific defences against pathogens by showing ... [more ▼]

Sociality increases risks of disease transmission as genetically related individuals live in a confined environment. Therefore, social insects developed specific defences against pathogens by showing hygienic behaviours such as the rejection of cadavers and other wastes. We investigated if the undertaking and waste management is actually an efficient way of increasing ants’ survival and of limiting pathogens transmission. First, we observed the survival curve of ant colonies that were prevented from rejecting their dead nestmates outside the nest. Colonies that were forced to keep their dead inside the nest showed increased mortality of both adults and larvae in comparison to control nests, confirming that undertaking is an effective way for improving colony’s survival. Then, we compared the rejection dynamics of single waste items (ant cadavers, preys and clay pellet) introduced into ant nests. Clay pellets were quickly rejected within 12 ± 4 minutes, cadavers were dumped outside after 139 ± 28 min and preys were eaten and rejected only after 17.3 ± 0.3 hours. Spatial localisation inside the nest also differs between different items, as most cadavers stayed far from ants’ aggregate and larvae while preys were long-eaten close to larvae and inside ants’ aggregate. These results show that cadavers and preys are managed differently before becoming contagious, thus preventing effectively pathogens transmission inside the nest. [less ▲]

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See detailAssessment methodology of the intradermal tuberculosis skin test performed in cattle by field practitioners
Humblet, Marie-France ULg; Walravens, K.; Salandre, O. et al

Poster (2010)

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See detailCombining Mixed Integer Programming and Supervised Learning for Fast Re-planning
Rachelson, Emmanuel ULg; Ben Abbes, Ala; Diemer, Sébastien

in Proceedings of the 22nd IEEE International Conference on Tools with Artificial Intelligence (2010)

We introduce a new plan repair method for problems cast as Mixed Integer Programs. In order to tackle the inherent complexity of these NP-hard problems, our approach relies on the use of Supervised ... [more ▼]

We introduce a new plan repair method for problems cast as Mixed Integer Programs. In order to tackle the inherent complexity of these NP-hard problems, our approach relies on the use of Supervised Learning method for the offline construction of a predictor which takes the problem’s parameters as input and infers values for the discrete optimization variables. This way, the online resolution time of the plan repair problem can be greatly decreased by avoiding a large part of the combinatorial search among discrete variables. This contribution was motivated by the large-scale problem of intra-daily recourse strategy computation in electrical power systems. We report and discuss results on this benchmark, illustrating the different aspects and mechanisms of this new approach which provided close-to-optimal solutions in only a fraction of the computational time necessary for existing solvers. [less ▲]

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See detailEvaluation et proposition de révision du deuxième Programme de Gestion Durable de l'Azote en agriculture en Région wallonne (Belgique)
Vandenberghe, Christophe ULg; Benoit, Jérémie ULg; Deneufbourg, Mathieu ULg et al

in Marcoen, Jean Marie; Vandenberghe, Christophe (Eds.) Actes de l'Atelier "Nitrate - Eau" 2 au 5 juin 2009. Peyresq, France (2010)

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See detailAnalysis of Textual Data, a interdisciplinary approach for studying the text structure indicators : the case of Latin historic narrative
Longrée, Dominique ULg; Mellet, Sylvie

in Proceedings of the International Workshop on Multidisciplinary Approaches to Discourse 2010 (MAD'10): « Multidisciplinary Perspectives on Signalling Text Organisation », March 17-20, 2010, Moissac, France, (2010)

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See detailMixed symmetric baryon multiplets in large $N_c$ QCD: two and three flavours
Matagne, Nicolas; Stancu, Floarea ULg

in Bled Workshops in Physics (2010), 11(1), 37-43

We propose a new method to study mixed symmetric multiplets of baryons in the context of the $1/N_c$ expansion approach. The simplicity of the method allows to better understand the role of various ... [more ▼]

We propose a new method to study mixed symmetric multiplets of baryons in the context of the $1/N_c$ expansion approach. The simplicity of the method allows to better understand the role of various operators acting on spin and flavour degrees of freedom. The method is tested on two and three flavours. It is shown that the spin and flavour operators proportional to the quadratic invariants of SU$_S$(2) and SU$_F$(3) respectively are dominant in the mass formula. [less ▲]

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See detailLowest negative parity baryons in the 1/Nc expansion
Matagne, Nicolas; Stancu, Floarea ULg

in Acta Physica Polonica. B, Proceedings Supplement (2010), 3

We review a recently proposed approach to study the lowest negative parity baryons within the $1/N_c$ expansion. The method is based on the derivation of the matrix elements of SU(2N$_f$) generators for ... [more ▼]

We review a recently proposed approach to study the lowest negative parity baryons within the $1/N_c$ expansion. The method is based on the derivation of the matrix elements of SU(2N$_f$) generators for mixed symmetric $[N_c-1,1]$ flavor-spin states. Presently it is applied to the N = 1 band and a comparison is made with a former method based on the decoupling of the system into a symmetric core of $N_c-1$ quarks and an excited one. We prove that the decoupling is not necessary and moreover, it misses some important physical consequences. [less ▲]

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See detailF1FO ATP synthase mutants in Chlamydomonas: Stability and oligomycin resistance mediated by atypical Asa7 protein; interaction between chloroplastic and mitochondrial bioenergetics
Lapaille, Marie ULg; Escobar-Ramírez, Adelma; Degand, Hervé et al

in Biochimica et Biophysica Acta (BBA) - Bioenergetics (2010), 1797(Supplement 1), 29

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See detailEcosystem services in mixed forests and monocultures: comparing stakeholders’ perceptions and scientific knowledge
Carnol, Monique ULg; Branquart, Etienne; Muys, Bart et al

in Book of Abstacts, IUFRO 7.01 Conference: Adaptation of Forest Ecosystems to Air Pollution and Climate Change, Antalya 2010 (2010)

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See detailDamage modelling in geotechnics: micromechanical approaches
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg et al

in Zhao, Jian; Labiouse, Vincent; Dudt, Jean-Paul (Eds.) et al EUROCK2010: Rock Mechanics in Civil and Environmental Engineering (2010)

The mechanical behaviours of geomaterials are significantly affected by the presence of voids or cracks-like defects. The modelling of such behaviour is classically performed by considering purely ... [more ▼]

The mechanical behaviours of geomaterials are significantly affected by the presence of voids or cracks-like defects. The modelling of such behaviour is classically performed by considering purely macroscopic or micromechanically-based damage models. In the perspective of applications in civil engineering or in geomechanics, we propose in this paper to evaluate a homogenization approach, based on Mori-Tanaka scheme, applied to microcracked materials. In order to provide an appropriate interpretation of the nonlinear behaviour at macro-scale, the crack-induced damage is coupled to friction phenomena on closed cracks lips. The predictions of the coupled model are first analysed on laboratory tests performed on Callovo-Oxfordian Clay. Then, they are extended to a numerical analysis of excavation damaged zones around tunnels. [less ▲]

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See detailInterest, recording and possible use of new phenotypes from fine milk composition
Gengler, Nicolas ULg; Soyeurt, Hélène ULg

in Proceedings of the 9th World Congress on Genetics Applied to Livestock Production (2010)

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See detailRecent trends of inorganic chlorine and halogenated source gases above the Jungfraujoch and Kitt Peak stations derived from high-resolution FTIR solar observations
Mahieu, Emmanuel ULg; Rinsland, Curtis P.; Gardiner, Tom et al

in Geophysical Research Abstracts (2010), 12(EGU2010-2420-3),

The longest series of Fourier Transform Infrared (FTIR) high spectral resolution solar absorption observations are available from the Jungfraujoch and Kitt Peak stations, located at 46.5ºN and 30.9ºN ... [more ▼]

The longest series of Fourier Transform Infrared (FTIR) high spectral resolution solar absorption observations are available from the Jungfraujoch and Kitt Peak stations, located at 46.5ºN and 30.9ºN, respectively. State-of-the-art interferometers are operated at these sites within the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). These instruments allow to record spectra on a regular basis, under clear-sky conditions, using a suite of optical filters which altogether cover the 2 to 16 micron spectral range. Numerous absorption features characterized in the HITRAN compilations (e.g. Rothman et al., 2008) are encompassed in this mid-infrared region. Their analyses with either the SFIT-1 or SFIT-2 algorithm allow retrieving total columns of the target gases. Moreover, information on their distribution with altitude can generally be derived when using SFIT-2 which implements the Optimal Estimation Method of Rodgers (1990). Among the two dozen gases of atmospheric interest accessible to the ground-based FTIR technique, we have selected here a suite of long-lived halogenated species: HCl, ClONO2, CCl2F2, CCl3F, CHClF2, CCl4 and SF6. Time series available from the two sites will be presented, compared and critically discussed. In particular, changes in the abundances of theses gases since the peak in inorganic chlorine (Cly, which occurred in 1996-1997) and their intra-annual variability will be characterized with a statistical tool using bootstrap resampling (Gardiner et al., 2008). Trends and their associated uncertainties will be reported and put into perspective with the phase-out regulations of the production of ozone depleting substances adopted and implemented by the Montreal Protocol, its Amendments and Adjustments. For instance, the trends affecting the reservoir species HCl, ClONO2, and their summation which is a good proxy of the total inorganic chlorine, have been calculated using all available daily mean measurements from January 1996 onwards. The following values were obtained for Jungfraujoch, when using 1996 as the reference year: -0.90±0.10%/yr for HCl, -0.92±0.26 %/yr for ClONO2, and -0.96±0.14 %/yr for Cly; in all cases, the uncertainties define the 95% confidence interval around the trend values. For Kitt Peak, the corresponding trends are: -0.55±0.34 %/yr for HCl, -1.27±0.84 %/yr for ClONO2 and -0.61±0.51 %/yr for Cly, they are statistically consistent with the Jungfraujoch rates of decrease. Further trend data will be presented at the EGU General Assembly while supplementary information on Jungfraujoch results will be available from communications at the same meeting by Duchatelet et al. (2010), Lejeune et al (2010) and Rinsland et al (2010). Comparisons with model data are also foreseen. [less ▲]

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See detailWorking Group 3 Infrared interferometry at Dome C
Coudé Du Foresto; Surdej, Jean ULg

in Spinoglio, L.; Epchtein, N. (Eds.) ies 3rd ARENA Conference: An Astronomical Observatory at CONCORDIA (Dome C, Antarctica) (2010)

The goal of the working group was to define and realize a pre-feasibility study of an Antarctic interferometer dedicated to the characterization of exozodis with the sensitivity required (30 zodis 5 Ï ... [more ▼]

The goal of the working group was to define and realize a pre-feasibility study of an Antarctic interferometer dedicated to the characterization of exozodis with the sensitivity required (30 zodis 5 Ï detection) to discriminate sources suitable for future exoearth spectroscopic analysis. The engineering study was carried out at AMOS, based on a concept by Thalès Alenia Space derived from the GENIE instrument studied for ESA. Particular emphasis was put on the compatibility with Concordia logistic and operational constraints, for which input was provided by IPEV through long visits by a system engineer student, Xavier Daudigeos. The preliminary results are encouraging enough so that we recommend to move forward with a proposal for full industrial feasibility study that could be submitted to FP7 and/or to ESA. [less ▲]

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See detailLes animateurs de la vie littéraire. Sociabilités littéraires au sein du sous-champ belge francophone de l’entre-deux-guerres
Dozo, Björn-Olav ULg

in Joyeux-Prunel, Béatrice (Ed.) L'art et la mesure. Histoire de l'art et méthodes quantitatives (2010)

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See detailDiagenèse osseuse et genèse de nodules phosphatés, associés aux sédiments fluvio-lacustres de sites à hominidés miocène (Kenya)
DERICQUEBOURG, P.; PERSON, A.; SEGALEN, L. et al

Poster (2010)

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See detailIntegrating collective work aspects in the design process: An analysis case study of the robotic surgery. Using communication as a sign of fundamental change
Nyssen, Anne-Sophie ULg; Blavier, Adelaïde ULg

in Palanque, Philippe; Vanderdonck; Winckler (Eds.) Human Error, Safety and System Development (2010)

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See detailStromatoporoids paleoecology from the Frasnian (Upper Devonian) of Southern Belgium.
Da Silva, Anne-Christine ULg; Kershaw, Stephen; Boulvain, Frédéric ULg

in International Palaeontological Congress, Programme and Abstracts (2010)

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See detailReliable hydraulic numerical modeling with multiblock grids and linked models
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proc. Int. Conf. SimHydro 2010: Hydraulic modeling and uncertainty (2010)

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See detailConstraining fission parameters for highly excited compound nuclei
Mancusi, Davide ULg; Cugnon, Joseph ULg; Charity, R. J.

in Seminar on Fission, het Pand (2010)

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See detailWater table mapping using Bayesian data fusion with auxiliary data
Fasbender, Dominique; Bogaert, Patrick; Peeters, Luk et al

in Water 2010 symposium, International Symposium on Stochastic Hydraulics (2010)

Water table elevations are usually sampled in space using piezometric measurements, that are unfortunately both expensive to drill and monitor and consequently are thus scarce over space. Most of the time ... [more ▼]

Water table elevations are usually sampled in space using piezometric measurements, that are unfortunately both expensive to drill and monitor and consequently are thus scarce over space. Most of the time, piezometric data are sparsely distributed over large areas, thus providing limited direct information about the level of the corresponding water table. As a consequence, there is a real need for approaches that are able at the same time to (i) provide spatial predictions at unsampled locations and (ii) enable the user to account in a meaningful way for all potentially available secondary information sources that are in some way related to water table elevations. Advantages of these auxiliary information sources are their cheapest prices and their better spatial coverage, thus allowing the user to improve the quality of subsequent mapping provide that a meaningful way of merging these data is made available. In this paper, a recently developed Bayesian Data Fusion technique (BDF) is applied to the problem of water table spatial mapping. After a brief presentation of the underlying theory, specific assumptions are made and discussed in order to account for a digital elevation model as well as for the geometry of a corresponding river network. Based on a data set for the Dyle basin in the north part of Belgium, the suggested model is then implemented by accounting for two secondary information sources, i.e., a spatially exhaustive high resolution digital elevation model and a metric allowing us to account for the whole geometry of the river network as auxiliary information. Results are compared to those of standard spatial mapping techniques like ordinary kriging and cokriging. Respective accuracies and precisions of these estimators are finally evaluated using a leave-one-out cross-validation procedure. They show one one side the obvious benefit of incorporating additional information sources, but more interesting they also emphasize the limitations of traditional multivariate methods (like, e.g., cokriging methods) that fail to efficiently take benefit of these addditional information due to restrictive modeling hypotheses, whereas BDF has no difficulty on that side. Though the BDF methodology was illustrated here for the integration of only two secondary information sources, the method can also be applied for incorporating an arbitrary number of auxiliary variables. It has also been successfully applied in other fields like remote-sensing and air pollution, thus opening new avenues for the important and general topic of data integration in a spatial mapping context. Extension towards a space-time context for dynamic mapping is also possible. [less ▲]

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See detailLocal Structure of Mn in (La1-xHox)2/3Ca1/3MnO3 Studied by X-ray Absorption Fine Structure
Pietnoczka, A.; Pekala, M.; Bacewicz, R. et al

in Acta Physica Polonica A (2010), 117(2), 257-261

Results of X-ray absorption fine structure measurements in manganites (La1-xHox)2/3Ca1/3MnO3 with 0.15 < x < 0.50 are presented. When LaMnO3 is doped with a divalent element such as Ca2+, substituting ... [more ▼]

Results of X-ray absorption fine structure measurements in manganites (La1-xHox)2/3Ca1/3MnO3 with 0.15 < x < 0.50 are presented. When LaMnO3 is doped with a divalent element such as Ca2+, substituting forLa3+, holes are induced in the filled Mn d orbitals. This leads to a strong ferromagnetic coupling between Mn sites. Ca ions in La1-xCaxMnO3 introduce a distortion of the crystal lattice and mixed valence Mn ions (Mn3+ and Mn4+). On the other hand, in manganites (La1-xHox)2/3Ca1/3MnO3 the substitution of La for Ho causes a lattice distortion and induces a disorder, which reduces a magnetic interaction. The ferromagnetic transition temperature and conductivity decrease very quickly with increasing x. The magnetic and transport properties of compounds depend on the local atomic structure around Mn ions. The information on the bond lengths and Debye–Waller factor are obtained from the extended X-ray absorption fine structure (EXAFS) data analysis. The charge state of Mn is determined from the position of the absorption edge in X-ray absorption near edge structure (XANES) data. XAFS results are in good agreement with magnetic characteristics of the studied materials. [less ▲]

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See detailZero Energy Retrofit Case Study of a Chalet in Ain-Sukhna, EGYPT
Attia, Shady ULg

in Conference proceedings of American Solar Energy Society - 2010 (2010)

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Red Sea Coastline of Egypt. A chalet, located in Ain ... [more ▼]

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Red Sea Coastline of Egypt. A chalet, located in Ain-Sukhna is selected as a case study for the zero energy retrofit. The aim of the study is to investigate the potential of achieving thermal comfort and delivering electrical demands for existing buildings on site. The Red Sea Coastline of Egypt has a semi arid climate with an annual total irradiation above 2409 bankable kWh/m2 per year with approximately 3300 hours of full sunshine. Moreover, the annual monthly averages of wind speed in this region range from 5.0 to 7.1 m/s. Therefore, different passive and active design strategies are discussed and compared to reach an annual net zero energy demand for the existing building stock. In order to achieve zero energy retrofit certain strategies are examined. For example, internal loads reduction, envelope retrofitting in addition to the installation of solar water heater, photovoltaic and small-scale wind turbine. Based on a month-by–month demand analysis, internal loads and envelope performance are analyzed in order to explore the existing economical potential. Simulation software TRNSYS is used to predict the annual net zero energy performance for a chalet at Ain-Sukhna. The final result of this study compares the potential and constraints of each strategy and rank them based on economical feasibility. For the considered location and weather conditions the Chalet can provide thermal comfort for occupants and meets the zero energy objectives. The research also proofs that some strategies applied for retrofitting are economical rewarding with a payback period ranging from 2 to 7 years. [less ▲]

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See detailNondestructive Detection of Delaminations in Concrete Bridge Decks: A First Experimental Study
Van der Wielen, Audrey ULg; Courard, Luc ULg; Nguyen, Frédéric ULg

in Proceedings of the XIII International Conference on Ground Penetrating Radar (2010)

To detect delaminations in concrete bridge decks, nondestructive techniques (NDT) permit a frequent and large inspection of the slabs without damaging structures. This research was devoted to detect ... [more ▼]

To detect delaminations in concrete bridge decks, nondestructive techniques (NDT) permit a frequent and large inspection of the slabs without damaging structures. This research was devoted to detect simulated defects in twelve repaired concrete slabs. These were scanned with high frequency ground penetrating radar (GPR) with the common offset (CO) and common midpoint (CMP) methods. The electromagnetic waves speed was determined from CMPs. A 3D visualization program was also created to display the CO measurements. The visibility of the inserted defects revealed to be dependent on their lateral extension, their thickness and their constitutive material. [less ▲]

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See detailEffects of brand presence and stimulus of comparison on response inhibition toward alcohol cues in male and female heavy drinkers
Kreusch, Fanny ULg; Quertemont, Etienne ULg

in 2010 annual meeting of the Belgian Association for Psychological Sciences (2010)

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See detailApproaches for assessing potential impacts of thyroid hormone disrupting chemicals in wild sea bass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Klaren, Peter; Thomé, Jean-Pierre ULg et al

Poster (2010)

Organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters; of particular interest are effects on thyroid function. To assess the ability of occurring ... [more ▼]

Organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters; of particular interest are effects on thyroid function. To assess the ability of occurring pollutants in European coastal areas to disrupt the thyroid system in sea bass, a field study in the major European estuaries, namely, the Scheldt, the Seine, the Loire, the Charente and the Garonne has been conducted. Several thyroid endpoints were simultaneously examined. Diameter of follicles and the epithelial cell heights give an indication on the production and secretion activity of the thyroid gland. The activity of enzymes involved in the metabolism (deiodination, glucuronidation and sulfatation) of thyroid hormones was analyzed. Finally thyroxine (T4) and triiodothyronine (T3) concentrations were analyzed in muscle by radioimmunoassay. The combined use of all those endpoints gives us an overview of the complex thyroid hormone system. PCB concentration in wild fish varied from 10 to 100 ng g-1 wet weight (ww) depending on length and location. Each region has its own contamination levels and profiles reflecting the contribution of pollutants from rivers. The contamination levels were as follows: the highest concentrations were measured in individuals collected from the coastal region near the Scheldt > Seine > Loire > Charente and the lowest levels were observed in sea bass from coastal regions near the Garonne. Measurements of metabolic activity revealed an altered hepatic T4 outer ring deiodinase whereas T4 sulfatation and T4 glucuronidation were not affected. Owing to the extensive autoregulatory feedback at both central and peripheral levels, the thyroid hormone concentrations were preserved despite the PCB induced changes in thyroid hormone dynamics. [less ▲]

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See detailA mathematical model describing the biology of orthodontic tooth movement
Van Schepdael, A.; Vander Sloten, Jos; Geris, Liesbet ULg

in Goh Cho Hong, James; Teck Lim, Chwee (Eds.) proceedings of the 6th world congress on biomechanics (2010)

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See detailRemoval of Androgens and Estrogens from Water by Reactive Materials
Kai, Cai; Phillips, D. H.; Elliott, Chris et al

in 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2010) (2010)

Nowadays, endocrine disruptor compounds in the water system have become a concern due to the risk of contamination to wild life and humans even at the nanogram level. Excess estrogens and androgens are a ... [more ▼]

Nowadays, endocrine disruptor compounds in the water system have become a concern due to the risk of contamination to wild life and humans even at the nanogram level. Excess estrogens and androgens are a major contributor group of endocrine compounds. Statistical surveys have shown that dairy farms contribute to over 90% of the total estrogens in the UK and US. An analytical system is being developed to assess the efficiency of reactive materials to remove target hormonal contaminants from dairy farm effluent. This can be achieved using reporter gene assays (RGAs) to detect low level steroid hormones. A preliminary study comparing the efficiency of granular activated carbon, zero-valent iron, and organoclay was carried out using bench-scale evaluations in negative control HPLC water. Their potential ability to remove testosterone and 17- beta -estradiol spiked at reported environmental levels was measured by androgenic and estrogenic luminescent reporter assay respectively. [less ▲]

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See detailLa coocurrence, une relation asymétrique ?
Longrée, Dominique ULg; Luong, Xuan; Brunet, Etienne et al

in Bolasco, Sergio (Ed.) Proceedings of the JADT 2010, 10th International Conference on the Statistical Analysis of Textual Data, Rome, 9-11 June 2010 (2010)

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See detailAiming Zero Impact Buildings: Mondo Solar-2002, A case study in Belgium
Attia, Shady ULg; De Herde, André

in Sustainable Buildings CIB 2010 (2010)

This paper presents the Solar-2002 zero impact renovation project in Belgium. Its characteristics are based on fundamental principles taking advantage of natural resources by diverting the sun shine and ... [more ▼]

This paper presents the Solar-2002 zero impact renovation project in Belgium. Its characteristics are based on fundamental principles taking advantage of natural resources by diverting the sun shine and rain in the building design. The building has been renovated aiming to achieve principals of occupant health and comfort, energy efficiency, renewable energy production, resource conservation and reduction of environmental impacts. The paper reviews the design concepts including the passive and active strategies and compare building actual performance to actual monitoring results. Innovations relating to architectural design, building system performance and simulation are presented. Results show that the house achieved energy and carbon neutral balance, closed water cycle and almost a cradle to cradle building material cycle. However, monitoring results shows the difficulty to maintain optimal thermal comfort during extreme summer and winter periods. Achieving the environmental zero impact objectives is not economically feasible without the subsidies from the federal and regional government. [less ▲]

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See detailFriction coefficients evaluation for steel thixoforging
Pierret, Jean-Christophe ULg; Rassili, Ahmed ULg; Vaneetveld, Grégory ULg et al

in Proceedings of The 13th Esaform Conference on Material Forming (2010) - semi-solid processing (2010)

Since the first works on thixoforming, lot of studies have been performed all over the world and the behaviour of the globular semi-solid slurry is now quite well understood. This knowledge had lead to an ... [more ▼]

Since the first works on thixoforming, lot of studies have been performed all over the world and the behaviour of the globular semi-solid slurry is now quite well understood. This knowledge had lead to an industrialisation of the technology for low melting point alloys as aluminium or magnesium. For high melting point alloys as steel, this industrialisation is still a wish but seems closer each year. In the aim of this development of the process, it is important to be able to accurately represent the behaviour of the slurry during thixoforming. In this goal, lot of constitutive models has been proposed during the last years. However, until now there isn’t any study about the friction in the case of thixoforming. This knowledge is needed as friction has an important effect on the flow of the slurry during the shaping. The aim of this work is so to propose a quantification of the friction coefficients for the thixoforming technology thanks to experiments on a dedicated tool and comparison with simulations run on the finite elements code Forge2008©. The friction law is a Coulomb limited Tresca one. [less ▲]

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See detailThe influence of genetic selection on the milk fatty acid profile of spring calving dairy cows
McParland, Sinead; Berry, Donagh; Coleman, J. et al

in Proceedings of the British Society of Animal Science and the Agricultural Research Forum (2010)

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See detailThe SignSpeak Project -- Bridging the Gap Between Signers and Speakers
Dreuw, Philippe; Ney, Hermann; Martínez Ruiz, Gregorio et al

in 7th International Conference on Language Resources and Evaluation (2010)

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See detailD’Edgar Allan Poe à Marlene Streeruwitz : lecture « palimpsestueuse » du roman Partygirl
Pontzen, Alexandra ULg; Letawe, Céline ULg

in D'Amelio, Nadia (Ed.) Les Traductions extraordinaires d’Edgar Allan Poe. (2010)

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See detailLes taggers, auxiliaires heuristiques en ADT
Longrée, Dominique ULg; Mellet, Sylvie; Poudat, Céline

in Bolasco, Sergio (Ed.) Proceedings of the JADT 2010, 10th International Conference on the Statistical Analysis of Textual Data, Rome, 9-11 June 2010 (2010)

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See detailAtmospheric lead deposition in an ombrotrophic peat bog of Southern Poland
Fiałkiewicz-Kozieł, B.; De Vleeschouwer, F.; Smieja-Król, B. et al

Poster (2010)

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See detailA time-dependent damage law in solids: a homogenization approach
Dascalu, Cristian; François, Bertrand ULg

in 9th HSTAM International Congress on Mechanics (2010)

The theoretical developments and the numerical applications of a time-dependent damage law is presented. This law is deduced from considerations at the micro-scale where non-planar growth of micro-cracks ... [more ▼]

The theoretical developments and the numerical applications of a time-dependent damage law is presented. This law is deduced from considerations at the micro-scale where non-planar growth of micro-cracks, following a subcritical propagation criterion, is assumed. The passage from micro-scale to macro-scale is done through an asymptotic homogenization approach. The model is built in two steps. First, the effective coefficients are calculated at the micro-scale in finite periodical cells, with respect to the micro-cracks length and their orientation. Then, a subcritical damage law is developed in order to establish the evolution of damage. As shown by numerical simulations, the developed model enables to reproduce the long-term behavior encountering relaxation and creep effects. [less ▲]

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See detailLong-term trend of carbon tetrachloride (CCl4) from ground-based high resolution infrared solar spectra recorded at the Jungfraujoch
Rinsland, Curtis P.; Mahieu, Emmanuel ULg; Demoulin, Philippe ULg et al

in Geophysical Research Abstracts (2010), 12(EGU2010-1819-3),

The long-term trend of carbon tetrachloride (CCl4) has been retrieved from infrared high resolution solar absorption spectra encompassing the 1999 to 2010 time period. The measurements were recorded with ... [more ▼]

The long-term trend of carbon tetrachloride (CCl4) has been retrieved from infrared high resolution solar absorption spectra encompassing the 1999 to 2010 time period. The measurements were recorded with a Fourier transform spectrometer at the northern mid-latitude, high altitude Jungfraujoch station in Switzerland (46.5°N latitude, 8.0°E longitude, 3580 m altitude). Total columns were derived from the region of the strong CCl4 _3 band at 794 cm􀀀1 accounting for all interfering molecules (e.g. H2O, O3) with significant improvement in the residuals obtained by also taking into account the line mixing in a nearby CO2 Q branch, a procedure not implemented in previous remote sensing CCl4 retrievals though its importance has been noted in several papers. The time series shows a statistically-significant long-term decrease in the CCl4 total atmospheric burden of -1.18_0.10 %/yr, at the 95% confidence level, using 2005 as reference. Furthermore, fit to the total column data set also reveals a seasonal cycle with a peak-to-peak amplitude of 10.2%, with minimum and maximum values found in mid-February and early August, respectively. This seasonal modulation can however be attributed to tropopause height changes throughout the season. The results quantify the continued impact of the regulations implemented by the Montreal Protocol and its strengthening amendments and adjustments for a molecule with high global warming potential. Although a statistically significant decrease in the total column is inferred, the CCl4 molecule remains an important contributor to the stratospheric chlorine budget and burden. [less ▲]

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See detailSignSpeak -- Scientific Understanding and Vision-Based Technological Development for Continuous Sign Language Recognition and Translation
Dreuw, Philippe; Forster, Jens; Gweth, Yannick et al

in 4th Workshop on the Representation and Processing of Sign Languages: Corpora and Sign Language Technologies (2010)

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See detailVapor phase doping for ultra shallow junction formation in advanced Si CMOS devices
Shimizu, Yasuo; Nguyen, Ngoc Duy ULg; Jiang, Sijia et al

Poster (2010)

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See detailObject-Action Complexes: Grounded Abstractions of Sensorimotor Processes
Krüger, Norbert; Piater, Justus ULg; Geib, Christopher et al

in 4th International Conference on Cognitive Systems (2010)

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See detailLes contrats du consommateur – Rapport de droit belge
Biquet, Christine ULg

in Le consommateur (2010)

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See detailStudy of mechanical, physical and chemical properties of a-C:H films deposited by reactive magnetron sputtering in DC pulsed mode
Colaux, J. L.; Dumont, D.; Delwigne, T. et al

Poster (2010)

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See detailMagnetic model refinement via a coupling of finite element subproblems
Dular, Patrick ULg; V Sabariego, Ruth ULg; Krähenbühl, Laurent et al

in Proceedings of Scientific Computing in Electrical Engineering (SCEE 2010) (2010)

Model refinements of magnetic circuits are performed via a subdomain finite element method. A complete problem is split into subproblems with overlap- ping meshes, to allow a progression from source to ... [more ▼]

Model refinements of magnetic circuits are performed via a subdomain finite element method. A complete problem is split into subproblems with overlap- ping meshes, to allow a progression from source to reaction fields, ideal to real flux tubes, 1-D to 3-D models, perfect to real materials, statics to dynamics, with any coupling of these changes. Its solution is then the sum of the subproblem solutions. The procedure simplifies both meshing and solving processes, and quantifies the gain given by each refinement on both local fields and global quantities. [less ▲]

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See detailReading Pausanias: Cults of the Gods and Representation of the Divine
Pirenne-Delforge, Vinciane ULg

in Bremmer, Jan N.; Erskine, Andrew (Eds.) The Gods of Ancient Greece: Identities and Transformations (2010)

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See detailResults with INCL4
Cugnon, Joseph ULg; Mancusi, Davide ULg; Boudard, A. et al

in Proceedings to the Satellite Meeting on Nuclear Spallation Reactions, International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators 2009 (2010)

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