References of "Scientific congresses and symposiums"
     in
Bookmark and Share    
See detailPreliminary analysis of Martian dayglow observed by the Imaging Ultraviolet Spectrograph onboard MAVEN
Jain, Sonal; Stewart, Ian; Schneider, Nick et al

Conference (2015, March)

Detailed reference viewed: 13 (0 ULg)
See detailPreliminary analysis of Martian nightglow and aurora observed by MAVEN's Imaging UltraViolet Spectrograph
Stiepen, Arnaud ULg; Stewart; Jain et al

Conference (2015, March)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailWheat yield sensitivity to climate change across a European transect for a large ensemble of crop models
Pirttioja, Nina; Carter, Timothy; Fronzek, Stefan et al

in Soussana, Jean-Francois (Ed.) Proceedings of the Climate Smart Agriculture 2015 conference (2015, March)

Detailed reference viewed: 4 (0 ULg)
See detailFirst results from MAVEN's Imaging UV spectrograph
Schneider; McClintock; Stewart et al

Conference (2015, March)

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailAzione, testualizzazione, notazione
Dondero, Maria Giulia ULg

in Espressione e contenuto. Rivista on-line dell'AISS Associazione Italiana di Studi Semiotici (2015, March)

Detailed reference viewed: 18 (1 ULg)
See detailMAVEN IUVS observations of the aftermath of Comet Siding Spring's meteor shower
Stewart; Schneider; Plane et al

Conference (2015, March)

Detailed reference viewed: 16 (1 ULg)
Peer Reviewed
See detailCan the exploration of left space be induced implicitly in unilateral neglect?
Wansard, Murielle ULg; Bartolomeo, Paolo; Vanderaspoilden, Valérie et al

Poster (2015, March)

The purpose of the present study was to explore the ability of neglect patients to detect and exploit the predictive value of a cue to respond more quickly and accurately to targets on their ... [more ▼]

The purpose of the present study was to explore the ability of neglect patients to detect and exploit the predictive value of a cue to respond more quickly and accurately to targets on their contralesional side in a Posner spatial cueing task. The majority of the cues (i.e. 80%) were invalid, indicating that the target would appear on the opposite side, although patients were not informed of this bias. Our results demonstrate that some neglect patients were able to extract the cue’s predictability and use it to orient faster toward the left. This cueing effect was present even in patients who were subsequently unable to describe the predictive character of the cues, and thus was not modulated by reportable awareness of the cue-target relation. [less ▲]

Detailed reference viewed: 10 (2 ULg)
See detailGian Matteo Giberti et les lettres à travers la correspondance de jeunesse
Valenti, Gianluca ULg

Conference (2015, February 27)

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailAn Alternative to Semantics?
Gauvry, Charlotte ULg

Conference (2015, February 12)

Detailed reference viewed: 2 (0 ULg)
See detailEncourager un vieillissement cognitif sain par un travail adapté (work shop)
Grotz, Catherine ULg; Adam, Stéphane ULg

Conference (2015, February 12)

L'objectif du workshop est d'apporter des éléments pratiques/cliniques en faveur d'un vieillissement cognitif de qualité, y compris une discussion des mesures à mettre en place en ce qui concerne l ... [more ▼]

L'objectif du workshop est d'apporter des éléments pratiques/cliniques en faveur d'un vieillissement cognitif de qualité, y compris une discussion des mesures à mettre en place en ce qui concerne l'employabilité de la population active plus âgée. [less ▲]

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailRisk of emergence of a hyperpathogenic bovine leukemia virus by mutation of a single envelope N-linked glycosylation site
De Brogniez, Alix ULg; Bouzar, Amel-Baya; Jacques, Jean-Rock ULg et al

Poster (2015, February 11)

- Introduction : Pathogens have co-evolved with their host to ensure efficient replication and transmission without inducing excessive pathogenicity that would indirectly impair their persistence. This is ... [more ▼]

- Introduction : Pathogens have co-evolved with their host to ensure efficient replication and transmission without inducing excessive pathogenicity that would indirectly impair their persistence. This is exemplified by the bovine leukemia virus (BLV) system in which lymphoproliferative disorders develop in ruminants after latency periods of several years. Infection of sheep and cattle with BLV is a model system for the related human T-lymphotropic virus type 1 (HTLV-1) responsible for Adult T-cell Leukemia (ATL). - Aims : The goal of this work is to investigate the role of N-glycans of the viral envelope protein during viral replication and pathogenesis. - Methods and results : Using glycosylation inhibitors and lectins, we showed that N-glycosylation is involved in viral infection (i.e. cell-to-cell fusion). Using reverse genetics of an infectious molecular provirus, we next demonstrated that a particular N-linked envelope glycosylation site (N230) limits viral replication and pathogenicity in vitro and in vivo. We have thus generated a viral mutant that is more pathogenic than the wild type strain. - Conclusions : To our knowledge, this is the first time that a hyperpathogenic BLV has been identified. This unexpected observation has important consequences in terms of disease control and managing. Indeed, during evolution, pathogens and their hosts should achieve an equilibrium allowing the coexistence of the two species. Occurrence of this particular mutation may thus represent a potential threat associated with emergence of hyperpathogenic BLV strains and possibly of new variants of the related HTLV-1. [less ▲]

Detailed reference viewed: 27 (1 ULg)
Peer Reviewed
See detailLa pérennisation des partenariats publics-privés dans le champ de l’emploi : entre application, interprétation et ajustement du cadre réglementaire
Remy, Céline ULg; Gérard, Julie ULg; Beuker, Laura ULg

Conference (2015, February 07)

Dans une perspective de gestion mixte du marché du travail, les services publics de l’emploi sont invités, par la Convention 181 de l’OIT de 1997, à déléguer et à confier l’exploitation et la gestion de ... [more ▼]

Dans une perspective de gestion mixte du marché du travail, les services publics de l’emploi sont invités, par la Convention 181 de l’OIT de 1997, à déléguer et à confier l’exploitation et la gestion de leurs activités à des opérateurs privés de service, dans le cadre d’une entente contractuelle. Alors que les modalités de la collaboration (telles que le public-cible, le type et le nombre d’accompagnements dispensés, les résultats à atteindre, etc.) sont fixées, initialement, par les services publics de l’emploi, elles sont ensuite mises en pratique par les diverses parties-prenantes du partenariat. Les acteurs publics et privés exploitent la part de latitude inhérente à leur fonction pour interpréter et ajuster les termes du contrat ou pour pouvoir réaliser leur mission d’accompagnement des demandeurs d’emploi. Partant du postulat que la règle est incomplète, notre objectif est d’analyser la mise en œuvre du partenariat en saisissant les arguments avancés par les acteurs pour justifier et légitimer leurs actions. À partir de cette analyse, nous montrerons que les acteurs du partenariat doivent interpréter les règles – écart entre le travail prescrit et le travail effectivement presté – dans leurs pratiques quotidiennes. Agissant comme des « pseudo » street-level bureaucrats, ces derniers usent de leur pouvoir pour ajuster les règles. En outre, il semblerait que ces pratiques d'indiscipline permettent, en réalité, de maintenir les relations partenariales entre services publics de l’emploi et opérateurs privés, et d’œuvrer, in fine, à la pérennisation de celles-ci dans le champ de l’emploi. Nous appuierons notre analyse sur un matériau empirique composé d’observations participantes et d’entretiens semi-directifs réalisés auprès des parties-prenantes des PPP, situés en Belgique francophone. [less ▲]

Detailed reference viewed: 37 (2 ULg)
Peer Reviewed
See detailComprendre les programmes électoraux : comparaison des méthodes d’encodage manuel et automatique
Piet, Grégory ULg; Dandoy, Régis; Joly, Jeroen

Conference (2015, February 06)

Detailed reference viewed: 18 (0 ULg)
Full Text
See detailSuppression of Limit Cycle Oscillations using the Nonlinear Tuned Vibration Absorber
Habib, Giuseppe ULg; Kerschen, Gaëtan ULg

in Proceeding IMAC XXXIII A Conference and Exposition on Structural Dynamics, Orlando 2-5 February 2015 (2015, February 03)

The objective of the present study is to mitigate, or even completely eliminate, the limit cycle oscillations in mechanical systems using a passive nonlinear absorber, termed the nonlinear tuned vibration ... [more ▼]

The objective of the present study is to mitigate, or even completely eliminate, the limit cycle oscillations in mechanical systems using a passive nonlinear absorber, termed the nonlinear tuned vibration absorber (NLTVA). An unconventional aspect of the NLTVA is that the mathematical form of its restoring force is not imposed a priori, as it is the case for most existing nonlinear absorbers. The NLTVA parameters are determined analytically using stability and bifurcation analyses, and the resulting design is validated numerically using the MATCONT software. The proposed developments are illustrated using a Van der Pol-Du ng primary system. [less ▲]

Detailed reference viewed: 57 (13 ULg)
See detailAntoine Galland et l'épigraphie
Famerie, Etienne ULg

in Bauden, Frédéric; Waller, Richard (Eds.) Colloque international A. Galland (2015, February)

Detailed reference viewed: 12 (3 ULg)
Peer Reviewed
See detailLes structures frontalières de renseignement : le modèle français exportable ?
Pirot, Pascal ULg

Conference (2015, February)

Detailed reference viewed: 7 (2 ULg)
Full Text
See detailExperimental demonstration of a 3D-printed nonlinear tuned vibration absorber
Grappasonni, Chiara ULg; Habib, Giuseppe ULg; Detroux, Thibaut ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIII (2015, February)

Engineering structures are designed to be lighter and more flexible, hence reducing the extent of application of linear dynamic models. Concurrently, vibration mitigation is required for enhancing the ... [more ▼]

Engineering structures are designed to be lighter and more flexible, hence reducing the extent of application of linear dynamic models. Concurrently, vibration mitigation is required for enhancing the performance, comfort or safety in real-life applications. Passive linear vibration absorbers are purpose-built, often designed using Den Hartog's equal-peak strategy. However, nonlinear systems are known to exhibit frequency-energy-dependent oscillations which linear absorbers cannot effectively damp out. In this context, the paper introduces a new nonlinear tuned vibration absorber (NLTVA) whose nonlinear functional form is tailored according to the frequency-energy dependence of the nonlinear primary structure. The NLTVA design aims at ensuring equal peaks in the nonlinear receptance function for an as large as possible range of forcing amplitudes, hence generalizing Den Hartog's method to nonlinear systems. Our focus in this study is on experimental demonstration of the NLTVA performance using a primary structure consisting of a cantilever beam with a geometrically nonlinear component at its free end. The absorber is implemented using a doubly-clamped beam fabricated thanks to 3D printing. The NLTVA performance is also compared with that of the classical linear tuned vibration absorber. [less ▲]

Detailed reference viewed: 37 (4 ULg)
Full Text
Peer Reviewed
See detailCore-shell AgSiO2-Protoporphyrin IX nanoparticle: Effect of the Ag core on reactive oxygen species generation
Lismont, Marjorie ULg; Pàez Martinez, Carlos ULg; Dreesen, Laurent ULg

in SPIE proceeding - Colloidal Nanoparticles for Biomedical Applications X (2015, February)

Photodynamic therapy (PDT) for cancer is based on the use of a light sensitive molecule to produce, under specific irradiation, toxic reactive oxygen species (ROS). A way to improve the therapy efficiency ... [more ▼]

Photodynamic therapy (PDT) for cancer is based on the use of a light sensitive molecule to produce, under specific irradiation, toxic reactive oxygen species (ROS). A way to improve the therapy efficiency is to increase the amount of produced ROS near cancer cells. This aim can be achieved by using a metal enhanced process arising when an optically active molecule is located near a metallic nanoparticle (NP). Here, the coupling effect between silver (Ag) NPs and protoporphyrin IX (PpIX) molecules, a clinically approved photosensitizer, is studied compared first, to PpIX fluorescence yield and second, to ROS production efficiency. By applying a modified Stöber process, PpIX was encapsulated into a silica (SiO2) shell, surrounding a 60 nm sized Ag core. We showed that, compared to SiO2-PpIX NPs, Ag coated SiO2-PpIX NPs dramatically decreased PpIX fluorescence together with singlet oxygen production efficiency. However, after incubation time in the dark, the amount of superoxide anions generated by the Ag doped sample was higher than the control sample one. [less ▲]

Detailed reference viewed: 10 (2 ULg)
Full Text
See detailBridging the gap between Nonlinear Normal Modes and Modal Derivatives
Sombroek, Cees; Renson, Ludovic ULg; Tiso, Paolo et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIII (2015, February)

Nonlinear Normal Modes (NNMs) have a clear conceptual relation to the classical linear normal modes (LNMs), yet they offer a solid theoretical framework for interpreting a wide class of non-linear ... [more ▼]

Nonlinear Normal Modes (NNMs) have a clear conceptual relation to the classical linear normal modes (LNMs), yet they offer a solid theoretical framework for interpreting a wide class of non-linear dynamical phenomena with no linear counterpart. The main difficulty associated with NNMs is that their calculation for large-scale models is expensive, particularly for distributed nonlinearities. Repeated direct time integrations need to be carried out together with extensive sensitivity analysis to reproduce the frequency-energy dependence of the modes of interest. In the present paper, NNMs are computed from a reduced model obtained using a quadratic transformation comprising LNMs and Modal Derivatives (MDs). Previous studies have shown that MDs can capture the essential dynamics of geometrically nonlinear structures and can greatly reduce the computational cost of time integration. A direct comparison with the NNMs computed from another standard reduction technique highlights the capability of the proposed reduction method to capture the essential nonlinear phenomena. The methodology is demonstrated using simple examples with 2 and 4 degrees of freedom. [less ▲]

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailExperimental modal analysis of nonlinear structures using broadband data
Noël, Jean-Philippe ULg; Renson, Ludovic ULg; Grappasonni, Chiara ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIII (2015, February)

The objective of the present paper is to develop a rigorous identification methodology of nonlinear normal modes (NNMs) of engineering structures. This is achieved by processing experimental measurements ... [more ▼]

The objective of the present paper is to develop a rigorous identification methodology of nonlinear normal modes (NNMs) of engineering structures. This is achieved by processing experimental measurements collected under broadband forcing. The use of such a type of forcing signal allows to excite multiple NNMs simultaneously and, in turn, to save testing time. A two-step methodology integrating nonlinear system identification and numerical continuation of periodic solutions is proposed for the extraction of the individual NNMs from broadband input and output data. It is demonstrated using a numerical cantilever beam possessing a cubic nonlinearity at its free end. The proposed methodology can be viewed as a nonlinear generalization of the phase separation techniques routinely utilized for experimental modal analysis of linear structures. The paper ends with a comparison between this new nonlinear phase separation technique and a previously-developed nonlinear phase resonance method. [less ▲]

Detailed reference viewed: 32 (6 ULg)
Full Text
See detailExperimental nonlinear identification of an aircraft with bolted connections
De Filippis, Giovanni; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIII (2015, February)

Aircraft structures are known to be prone to nonlinear phenomena, especially as they constantly become lighter and hence more flexible. One specific challenge that is regularly encountered is the modeling ... [more ▼]

Aircraft structures are known to be prone to nonlinear phenomena, especially as they constantly become lighter and hence more flexible. One specific challenge that is regularly encountered is the modeling of the mounting interfaces between aircraft subcomponents. Indeed, for large amplitudes of vibration, such interfaces may loosen and, in turn, trigger complex mechanisms such as friction and clearances. In this context, the present work intends to investigate the nonlinear dynamics of the Morane–Saulnier Paris aircraft, accessible at ONERA. This aircraft possesses multiple bolted connections between two external fuel tanks and wing tips. The objective of the paper is specifically to carry out an adequate identification of the numerous nonlinearities affecting the dynamics of this full-scale structure. Nonlinearity detection and the subsequent subspace-based parameter estimation have been performed on experimental data, collected during an on-ground test campaign. Nonlinearity detection is first achieved by the comparison of frequency response functions estimated at low excitation level, with those obtained at high amplitude level, yielding insight towards accurately characterizing the behavior of the bolted connections. Then, a nonlinear subspace identification method is applied to measured data to estimate the linear and nonlinear parameters of the structure and novel strategies and tools that overcome specific arisen problems are developed. [less ▲]

Detailed reference viewed: 60 (1 ULg)
Peer Reviewed
See detailDépasser la situation : de la situation-limite à la personnalité borderline. Généalogie, critique et clinique d’un concept sartrien
Cormann, Grégory ULg; Englebert, Jérôme ULg

Conference (2015, January 31)

Nous souhaitons interroger ici le concept sartrien de situation à partir d’une double approche historique et psychopathologique qui semble en diagnostiquer la disparition tout aussi bien conceptuelle ... [more ▼]

Nous souhaitons interroger ici le concept sartrien de situation à partir d’une double approche historique et psychopathologique qui semble en diagnostiquer la disparition tout aussi bien conceptuelle qu’existentielle : la notion de situation, organisatrice de l’ontologie phénoménologique de Sartre et pivot de son engagement, semble s’être aujourd’hui désintégrée en tant que concept (voir ses usages pseudo-conceptuels dans les domaines de la pédagogie et du management), alors que ce qu’on appelle la « condition postmoderne », telle qu’elle s’exprime dans de nouvelles symptomatologies psychopathologiques, rend apparemment caduque, face à la fragmentation des repères de l’existence, l’exigence de penser en/la situation. Nous procèderons en trois temps. Nous ferons d’abord la généalogie du concept, dont l’application à la psyché humaine et à la représentation théâtrale de celle-ci remonte, selon Leo Spitzer, à la fin du 17ème siècle. Dans cette première section, nous insisterons en particulier sur le rapport que l’élaboration du concept de situation entretient, au début du 20ème siècle, avec l’émergence de la psychopathologie notamment chez Jaspers (« situation-limite ») et chez Minkowski (nous rappellerons à cet égard le rôle de Gabriel Marcel dans le champ philosophique français de l’entre-deux-guerres). Nous serons également attentifs à la critique méthodologique que le concept de situation permet d’adresser à la métapsychologie freudienne. Sur cette base, nous reprendrons ensuite les principales étapes chez Sartre de la prise en considération de l’homme en situation et des possibilités de dépassement de cette situation. Nous envisagerons successivement l’Esquisse d’une théorie des émotions, « Questions de méthode » et L’Idiot de la famille. Il conviendra certes de rappeler comment l’existentialisme, comme le situationnisme à sa façon, a cherché, dans le sillage du marxisme, à réaliser la philosophie et du coup à transformer le concept en vécu. Mais nous montrerons aussi, à rebours, comment l’œuvre sartrienne, confrontée aux exigences conjointes du marxisme et de la psychanalyse (cf. l’analyse des pressions familiales dans le Flaubert), a dû dépasser le cadre de la magie émotionnelle au sein duquel la notion de situation s’était d’abord élaborée. Au-delà de la « situation sartrienne » – et peut-être en la prolongeant –, la critique de Deleuze des dispositifs nous servira enfin, dans un troisième temps, de point de bascule vers la condition postmoderne et la fragmentation de la situation en tant que repère d’existence. Le sujet borderline – véritable éclat de la postmodernité – nous permettra ainsi de conclure en reprenant le propos psychopathologique maturé par l’évolution conceptuelle de la situation. Nous caractériserons l’existence borderline par une fragmentation du soi corrélée à une explosion, voire à un morcellement, des espaces de vie qui répondent à la nécessité ontologique d’une « ubiquité instantanée » dénuée de présence corporelle (comme le permettent les espaces virtuels « connectés »). [less ▲]

Detailed reference viewed: 43 (6 ULg)
Full Text
See detailBiochemical methane potential of residues of three banana varieties from Cameroon : fresh and dry peduncles
Awedem wobiwo, Florent; Happi Emaga, Thomas; Fokou, Elie et al

Poster (2015, January 30)

In Cameroon , the ratio of energy cost to standard of living for both electric and fuel energy is higher than in USA and EU. The local energy needs could be met by valorizing local wastes in an ... [more ▼]

In Cameroon , the ratio of energy cost to standard of living for both electric and fuel energy is higher than in USA and EU. The local energy needs could be met by valorizing local wastes in an environmentally and economically sustainable way. Banana and plantain plants produce significant quantities of post-harvest biomass wastes such as bulbs, pseudo stems, leaf sheaths, petioles–midribs, leaf blades, peduncles, rachis and blossoms which can be converted to methane-rich biogas by anaerobic digestion (AD). AD is a natural process of degradation of organic materials. [less ▲]

Full Text
Peer Reviewed
See detailLinking bees and flowers: mutualistic interaction networks to study ecosystem functioning
Uyttenbroeck, Roel ULg; Monty, Arnaud ULg

Poster (2015, January 30)

In recent years, much attention is going to pollinators, as they are important for the increasing food production while being threatened by agricultural intensification and other environmental drivers ... [more ▼]

In recent years, much attention is going to pollinators, as they are important for the increasing food production while being threatened by agricultural intensification and other environmental drivers. While honeybees (Apis mellifera L.) are generalist according to their flower preferences, wild pollinators’ flower preferences can go from generalist to very specialist. The same goes for plant species, which can be generalist or specialist in the pollinator species they need to get pollinated. The combination of a set of generalist and specialist plant species with a pollinator community consisting of generalists and specialists in a certain habitat, results in an interaction network between pollinators and the visited plant flowers. Studying this mutualistic interaction network is a time-consuming method, but can provide valuable data to calculate indicators of ecosystem functioning. One of the important conclusions that came already out of studies applying this method is that pollination systems are often more generalized than thought based on pollination syndromes. This poster will explore the method of studying mutualistic interaction networks with a focus on the sampling protocol, the indicators that can be derived from the data and their meaning. [less ▲]

Detailed reference viewed: 3 (0 ULg)
Full Text
Peer Reviewed
See detailFéminiser la voix
Morsomme, Dominique ULg; Remacle, Angélique ULg

Conference (2015, January 29)

Parlée ou chantée, notre voix révèle qui nous sommes. Elle participe à notre identité et véhicule nos émotions (ref. Revis. J). Dans cet exposé, nous présenterons la voix du point de vue du genre. En ... [more ▼]

Parlée ou chantée, notre voix révèle qui nous sommes. Elle participe à notre identité et véhicule nos émotions (ref. Revis. J). Dans cet exposé, nous présenterons la voix du point de vue du genre. En effet, l’Unité Logopédie de la Voix (www.logopedie-voix.be) s’intéresse entre autres à la féminisation vocale chez les personnes transidentitaires, en processus de changement de genre. Ces personnes ne s’identifiant pas au sexe et au genre qui leur ont été attribués à la naissance, elles éprouvent un désir profond de vivre comme une personne du sexe opposé à leur sexe biologique. Lors du processus de transition où ont lieu les transformations nécessaires au changement de genre, la logopédie a pour but d’améliorer la cohérence entre l’apparence de la personne et sa voix. Ainsi, notre recherche se focalise sur ce qui distingue la voix féminine de la voix masculine. Nous visons à développer des stratégies de féminisation vocale, portant sur des paramètres tels que la fréquence fondamentale de la voix (grave ou aigüe), les contours intonatifs, le niveau d’amplitude de certains formants, le débit de parole, son rythme, ou encore le vocabulaire choisi. Féminiser une voix, c’est chercher à comprendre ce qui permet d’en identifier le genre, mais également participer à la construction de l’identité de la personne à part entière. [less ▲]

Full Text
Peer Reviewed
See detailUsing shear strain localisation to model the fracturing around gallery in unsaturated Callovo-Oxfordian claystone
Pardoen, Benoît ULg; Levasseur, Séverine ULg; Collin, Frédéric ULg

in Chau, Kam Tim; Zhao, Jidong (Eds.) Bifurcation and Degradation of Geomaterials in the New Millennium (2015, January 28)

Galleries drilling leads to damage propagation, fracturing and properties modifications in the surrounding medium. The prediction of the damaged zone behaviour is an important matter and needs to be ... [more ▼]

Galleries drilling leads to damage propagation, fracturing and properties modifications in the surrounding medium. The prediction of the damaged zone behaviour is an important matter and needs to be properly assessed. To do so the fractures can be modelled using shear strain localisation. The coupled local second gradient model is used under unsaturated conditions to correctly model the strain localisation behaviour. The permeability evolution and the rock desaturation due to air ventilation in galleries are considered. Finally, a hydro-mechanical modelling of a gallery excavation in Callovo-Oxfordian claystone is performed leading to a fairly good representation of the damaged zone. [less ▲]

Detailed reference viewed: 51 (16 ULg)
Full Text
Peer Reviewed
See detailAPPUI ANALYTIQUE A LA LUTTE CONTRE LES MEDICAMENTS DE QUALITE INFERIEURE
Mbinze Kindenge, Jérémie; Hubert, Philippe ULg; Marini Djang'Eing'A, Roland ULg

Conference (2015, January 27)

Detailed reference viewed: 19 (1 ULg)
Full Text
See detail[18F]UCB-H as a new PET radiotracer for Synaptic vesicle protein 2A: A first clinical trial
Bahri, Mohamed Ali ULg; Stifkens, Mathieu; Bastin, Christine ULg et al

Poster (2015, January 27)

SV2A is widely distributed in the brain and has been demonstrated to be involved in vesicle trafficking. The critical role of SV2A in proper nervous system function is shown, e.g., by the fact that it is ... [more ▼]

SV2A is widely distributed in the brain and has been demonstrated to be involved in vesicle trafficking. The critical role of SV2A in proper nervous system function is shown, e.g., by the fact that it is a binding site and the primary mechanism of levetiracetam. Levetiracetam is an antiepileptic drug which has recently been suggested to reduce synaptic deficits in a mouse model for Alzheimer’s disease. We here aimed to investigate the cerebral distribution of [18F]UCB-H, which has a high affinity with the SV2A. Dynamic PET data of the head of 4 healthy volunteers were acquired over 100 minutes after injection of 170.4 ± 24.9 MBq of GMP produced [18F]UCB-H. The arterial input function (IF) was obtained by blood sampling. The IF was also derived from the dynamic data using the correlation coefficient method. Blood data revealed a consistent amount of [18F]UCB-H in whole blood and plasma indicating a very low degree of binding of the tracer to the red blood cells. The image-derived arterial IFs were showed to be very similar to the measured ones with a peak-ratio around 0.91 and an area-under-curve ratio about 0.98. The [18F]UCB-H PET data showed a high and rapid uptake in the grey matter structures, matching the known ubiquitous distribution of the SV2A in the brain. The kinetics of the tracer in the brain was characterized by an initial high uptake phase followed by rapid washout allowing the standard compartmental modeling (1-tissue, 2-tissue, and Logan Plot). The three models gave similar results with both the measured and image-derived IFs. The total distribution volume of the tracer in the brain was greater than 7 mL/cm3. Our results suggest that [18F]UCB-H is a good candidate as radiotracer for brain SV2A proteins and could be used for human studies. Image-derived IF showed to be useful for quantitative studies without the need to the arterial blood sampling. SV2A modifications may consequently be assessed in neurological pathologies such as Alzheimer’s disease. [less ▲]

Detailed reference viewed: 14 (9 ULg)
See detailEffects of α-synuclein levels on cerebral synaptic function: Validation of a novel PET radioligand for the early diagnosis of Parkinson’s disease
Tarragon Cros, Ernesto ULg; Ferrara, André ULg; Tirelli, Ezio ULg et al

Poster (2015, January 27)

Background In Parkinson’s disease, converging evidence supports a pathogenic role for excessive α–synuclein accumulation in synaptic terminals that may propagate back to the soma of vulnerable nerve cells ... [more ▼]

Background In Parkinson’s disease, converging evidence supports a pathogenic role for excessive α–synuclein accumulation in synaptic terminals that may propagate back to the soma of vulnerable nerve cells such as neurons in the substantia nigra pars compacta. The resulting loss of dopaminergic terminals in the striatum can be demonstrated in vivo using 18F-Dopa-PET (positron emission tomography). However, there’s currently no validated biomarker of the progressive synaptic dysfunction in other vulnerable areas such as the cerebral cortex. Goal In this longitudinal study, we will test the hypothesis that the loss of synaptic terminals in a mouse model of excessive α–synuclein accumulation can be demonstrated in vivo before the occurrence of behavioural disturbances using 18F-UCB-H, a new PET biomarker developed at CRC. We will also test if this new imaging modality is sensitive enough to study the effect of a disease modifying therapy such as chronic physical exercise. Methods We will use microPET for the in vivo quantification of 18F-UCB-H brain uptake in 16 wild type animals and 16 transgenic (Tg) mice overexpressing human α–syn under the mThy1 promotor every 2 months. Data will be validated against post-mortem analyses after the last PET study. Predictions We predict decreased tracer uptake over time in the basal ganglia and cerebral cortex in Tg mice as compared with WT animals. Also, we predict a relationship between 18F-UCB-H uptake levels in basal ganglia and cerebral cortex and progressive alterations in both motor and cognitive functions, respectively. Further, we also expect that chronic exercise will slow down both motor and cognitive disturbances, as well as the rate of 18F-UCB-H brain uptake decreases. Conclusion If 18F-UCB-H PET proves to be a valid biomarker for the early detection of α–synuclein accumulation in the pre-clinical model of PD, the methods will tested on human clinical populations. [less ▲]

Detailed reference viewed: 17 (8 ULg)
Peer Reviewed
See detailLe testing adaptatif informatisé : une brève introduction
Magis, David ULg

Conference (2015, January 27)

L’objet de cet exposé est de présenter les grands principes et concepts du testing adaptatif informatisé (TAI). Les éléments abordés sont : le TAI face au test fixe (papier-crayon), les principes généraux ... [more ▼]

L’objet de cet exposé est de présenter les grands principes et concepts du testing adaptatif informatisé (TAI). Les éléments abordés sont : le TAI face au test fixe (papier-crayon), les principes généraux du TAI (banque d’items, estimation provisoire et finale de la compétence, sélection des items à administrer, règles d’arrêt), les principes spécifiques au TAI (contrôle de l’exposition des items, équilibrage du contenu des tests). L’exposé se veut didactique et général afin de dessiner les contours du TAI. Il se termine par un état de l’art sur les recherches actuelles sur le TAI. [less ▲]

Detailed reference viewed: 20 (2 ULg)
Peer Reviewed
See detailÉtude du Typus mélancholicus au sein d’une population de dépressifs unipoalires
ramackers, Amélia; Englebert, Jérôme ULg

Poster (2015, January 21)

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detailLa personnalité Borderline à travers le test de Rorschach
Rommes, Jennifer; Englebert, Jérôme ULg

Poster (2015, January 21)

Detailed reference viewed: 23 (0 ULg)
Peer Reviewed
See detailÉtude du récit de vie de l’adulte à haut potentiel
Mormont, Elodie; Gauthier, Jean-Marie ULg; Englebert, Jérôme ULg

Poster (2015, January 21)

Detailed reference viewed: 37 (2 ULg)
Full Text
Peer Reviewed
See detailProduction of extracellular polysaccharide by Enterobacter A47 using cheese whey as the sole carbon source
Antunes, S.; Alves, V.D.; Grandfils, Christian ULg et al

in Proceeding of the meeting (2015, January 19)

Detailed reference viewed: 50 (0 ULg)
Full Text
Peer Reviewed
See detailCharacterization of the chitin-glucan complex extracted from Komagataella pastoris cell wall
Farinha, I.; Duarte, P.; Pimentel et al

in Proceeding of the meeting (2015, January 19)

Detailed reference viewed: 22 (0 ULg)
Full Text
See detailCommotion cérébrale
Kaux, Jean-François ULg

Conference (2015, January 19)

Detailed reference viewed: 25 (8 ULg)
See detailLa mise en abyme comme procédé comique
Saint-Amand, Denis ULg

Conference (2015, January 17)

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailAcheter, cuisiner, transmettre. Diversification des choix alimentaires des familles marocaines en contexte migratoire.
Mescoli, Elsa ULg

Conference (2015, January 16)

Les études autour des cultures alimentaires contemporaines, menées dans le cadre de différentes disciplines, mettent en évidence le dynamisme interne et interrelationnels qui caractérise les gastronomies ... [more ▼]

Les études autour des cultures alimentaires contemporaines, menées dans le cadre de différentes disciplines, mettent en évidence le dynamisme interne et interrelationnels qui caractérise les gastronomies, plutôt qu’une « pureté » et « immobilisme » originels (La Cecla, 1998). Cependant, lorsqu’il s’agit d’analyser le rapport entre alimentation et migration, une essentialisation des habitudes se produit. Celles des migrants sont souvent considérées comme résistantes au changement, et elles deviennent les indicateurs de la disposition à « s’intégrer » à la société locale. Dans ce contexte discursif, où différentes règles interagissent en déterminant l’inclusion ou l’exclusion des individus de certains groupes (la communauté majoritaire, la collectivité « saine » etc.), les familles issues de la migration vivent et exercent leur quotidien alimentaire. Bricoler avec ces règles surdéterminées leur permet d’exprimer une créativité qui se met en œuvre à plusieurs niveaux : celui de l’approvisionnement, celui de la préparation des repas, celui de la transmission des savoir-faire entre les générations. Cette communication vise à présenter les données collectées au cours d’un travail de terrain ethnographique mené pendant dix-huit mois au milieu d’un groupe de femmes marocaines résidentes dans la province de Milan en Italie. Observations et entretiens ont été conduits à la fois dans les maisons et les espaces publics. Ils portaient sur les (micro)pratiques alimentaires entendues comme facteurs centraux dans la définition du soi, suivant une approche praxéologique à la subjectivation (Warnier, 2001). Grâce à cette analyse, il sera possible de constater qu’une culture alimentaire composite se redéfinit au niveau familial, bien qu’elle ne soit pas exemptée de l’effet de dynamiques culturelles, sociales, économiques et politiques plus amples et apparemment structurantes. On assiste à une diversification des pratiques. D’un côté, avec leurs déplacements pour faire leurs achats, femmes et hommes dessinent des chorégraphies complexes à l’intérieur de la ville, et ils engagent aussi une circulation transnationale des biens alimentaires. De l’autre côté, mères et filles puisent de savoirs différents pour faire face à leurs exigences, en s’appuyant sur une pluralité d’outils (mémoire incorporée, bouche à oreille, livres de recettes, internet). Ainsi, les familles continuent d’effectuer un choix actif en matière d’alimentation. L’analyse sera accompagnée par des supports visuels. [less ▲]

Detailed reference viewed: 29 (4 ULg)
Peer Reviewed
See detailLa mise en abyme vidéoludique comme vecteur d’une immersion au second degré : une analyse du jeu The Stanley Parable
Barnabé, Fanny ULg; Dozo, Björn-Olav ULg

Conference (2015, January 16)

Par sa nature même, le jeu entretient avec la réflexivité une parenté certaine. En effet, pour qu’une situation ou un objet soit reconnu comme ludique par les participants, il est nécessaire que ces ... [more ▼]

Par sa nature même, le jeu entretient avec la réflexivité une parenté certaine. En effet, pour qu’une situation ou un objet soit reconnu comme ludique par les participants, il est nécessaire que ces derniers superposent à leur action le message « ceci est un jeu » (Bateson, 1977). L’acte ludique, le « jouer » (Henriot, 1989), constitue donc un procédé de « méta-communication » (Bateson, 1977) supposant une interaction au second degré avec le réel (le joueur « fait comme si » ; Schaeffer, 1999). Le jeu vidéo n’échappe pas à cette dynamique réflexive, comme en témoigne le nombre important d’œuvres vidéoludiques qui – par le biais de différents outils formels – discourent sur leur propre organisation ludo-narrative, sur leurs possibilités d’utilisation ou sur le médium qui les supporte. Envisageant la mise en abyme comme l’un des procédés réflexifs – parmi d’autres – dont peut user le jeu vidéo, la présente communication visera à étudier les particularités de cette forme de représentation liées à son inclusion dans un environnement ludique. La mise en abyme vidéoludique rompt-elle l’immersion du joueur, le « cercle magique » (Huizinga, 1950) ? Permet-elle l’élaboration d’un univers fictionnel cohérent malgré le fait qu’elle rappelle le joueur à son statut d’utilisateur ? A-t-elle nécessairement une vocation critique ou peut-elle constituer une fin en soi, un dispositif ludique à part entière ? Pour répondre à ces interrogations, nous nous intéresserons à un cas exemplaire de mise en abyme vidéoludique : le jeu The Stanley Parable. Celui-ci met en perspective l’action du joueur en lui faisant incarner le personnage de Stanley, dont le travail consiste à appuyer sur des boutons en suivant un ordre et une fréquence qui lui sont dictés par un ordinateur. Ce jeu d’aventure pousse la logique réflexive à un point tel (elle constitue son fondement ludique, narratif et esthétique) qu’il met en question sa force évocatrice et sa validité : l’accumulation des mises en abyme (reflétant l’expérience du joueur mais aussi l’histoire du jeu vidéo en général) empêche effectivement toute prise au sérieux du récit, tout investissement au premier degré. En multipliant les méta-énoncés, The Stanley Parable fait de la mise en abyme un système de règles en soi (un game) dont le principe ludique repose sur la manipulation des codes mêmes du jeu vidéo : le game designer y engage le joueur dans une lutte (un play) dont l’enjeu n’est autre que la maîtrise du langage vidéoludique. [less ▲]

Detailed reference viewed: 9 (2 ULg)
Peer Reviewed
See detailThe Impact of Employee-Employer Relationships on Domestic Worker’s Achievement of Transnational Family-Work Balance
Vivas Romero, Maria ULg

Conference (2015, January 16)

While the average mainstream woman’s daily commute to work is 28 minutes, the ageing Peruvian domestic workers I have followed for the past year, crossed the Atlantic ocean 12 years ago for jobs in ... [more ▼]

While the average mainstream woman’s daily commute to work is 28 minutes, the ageing Peruvian domestic workers I have followed for the past year, crossed the Atlantic ocean 12 years ago for jobs in Europe’s capital. They found in Brussels the opportunity to be employed either in the informal or formal domestic sector while they continued to cope with their transnational obligations as spouses, daughters, and mothers. Transnational family and Global Care Chains literature have examined the consequences of migrant domestic workers’ double role as mothers and workers abroad. My contribution takes the discussion one step further and examines how, in spite of their disadvantaged position within the global division of labor, these women manage to informally negotiate a transnational family-work balance. My analysis, based on the life-stories of two ageing Peruvian women, suggests that domestic-workers’ success in their negotiations for transnational family-work balance simultaneously depends on three factors: 1- their gender, race, and class positioning within the migratory, care, and welfare regimes of sending and receiving states, 2- their ability to circulate familial care transnationally through the different stages in their life-course, 3- the business or personalized relationship that they established through their life-course with their employers. Furthermore, this analysis shows that employers are key actors in domestic workers’ negotiation, not only of a family-work balance, but also simply for social protection, especially in their old age. Finally, I suggest that the analysis of these complex employer-employee negotiations may allows us to see how these particular domestic workers are taking small steps to professionalize their work while paving the way to erase the historical vestiges associated with it. [less ▲]

Detailed reference viewed: 11 (1 ULg)
Peer Reviewed
See detailProfession art-thérapeute?
Vandeninden, Elise ULg

Conference (2015, January 09)

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailErosion and sedimentation issues in a hydropower project: assessing impacts and opportunities
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Schüttrumpf, Holger (Ed.) Offene Gewässer: Strahlwirkung, Fischaufstieg, Fischabstieg, Sedimente, Schadstoffe (2015, January 09)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailLes médiateurs scolaires : une ressource pour la gestion des désordres scolaires
Dethier, Baptiste ULg

Conference (2015, January 09)

Dans de nombreux pays, principalement anglo-saxons, la médiation par les pairs s’est développée dans les écoles. Cependant, la spécificité de la Belgique francophone réside dans le développement, par des ... [more ▼]

Dans de nombreux pays, principalement anglo-saxons, la médiation par les pairs s’est développée dans les écoles. Cependant, la spécificité de la Belgique francophone réside dans le développement, par des fonctionnaires publics spécialisés, de dispositifs de médiation scolaire (Kuty et al., 2012). Censés prévenir la violence et le décrochage scolaires et agir sur le climat de l’école, ces dispositifs ne sont pas uniquement destinés à résoudre les problèmes posés par les élèves perturbateurs (ou plutôt de ces élèves en tant que problèmes eux-mêmes) mais aussi à stimuler la participation, l’implication et la responsabilisation des adultes, principalement les enseignants. De ce fait, ils interrogent les formes scolaires traditionnelles, voire bousculent les équilibres historiques du système (Verhoeven, 1997), en ouvrant davantage que des espaces de « traitement » des élèves dits « à problèmes ». Sur base de dix entretiens semi-directifs, cinq focus groups et trois périodes d’observation non participante auprès de médiateurs scolaires belges francophones, cette communication a pour objectif de décrire le cœur du travail de ces derniers pour mieux en saisir les caractéristiques et les enjeux. En effet, à partir d’un cadre légal restreint et flou initié dans les années 1990, les médiateurs ont développé des pratiques et des dispositifs s’inscrivant dans une logique de médiation, organisés sur le principe de l’intervention d’un tiers dit neutre et indépendant visant à aider au rétablissement d’une relation entre deux parties. Ces dispositifs cherchent à rompre avec les logiques historiques de stigmatisation des élèves perturbateurs, que nous interrogerons. [less ▲]

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailLa réforme des soins de santé mentale en Belgique: pas complètement convergents, mais concrètement interdépendants
Thunus, Sophie ULg

Conference (2015, January 08)

Dans cet article, nous retracerons d’abord les grandes lignes des évolutions des associations d’usagers et de proches en santé mentale, en Europe et en Belgique. Ensuite, nous présenterons une ... [more ▼]

Dans cet article, nous retracerons d’abord les grandes lignes des évolutions des associations d’usagers et de proches en santé mentale, en Europe et en Belgique. Ensuite, nous présenterons une expérimentation politique dans le champ de la santé mentale en Belgique, qui a été l’occasion, pour les associations d’usagers et de proches, d’institutionnaliser leur participation. A cette occasion, nous évoquerons les motifs politiques à l’origine du projet de participation (acte 1) confié par les autorités publiques belges aux associations, ses modalités, et son implémentation au sein d’un dispositif d’action publique impliquant également des experts professionnels et scientifiques. Dans un troisième temps, nous nous intéresserons à la poursuite du projet participation dans le cadre de la réforme actuelle de la santé mentale et de la psychiatrie. Nous décrirons les modalités d’implémentation du projet (acte 2) et les nouveaux défis qui se posent aux associations, au fur-et-à-mesure de l’augmentation et de la visibilité accrue de leur participation aux niveaux institutionnels et politiques. En conclusion, nous soulignerons le caractère contingent de l’émergence et de la stabilisation de la participation en Belgique. Nous verrons que ce caractère contingent est à l’origine de fortes interdépendances entre le développement de la participation, des projets politiques spécifiques et trajectoires individuelles particulières. Cette interdépendance génère à son tour des enjeux spécifiques, pour les associations et les représentants des usagers, en termes identitaires et de légitimité. Nous soulignerons en outre le caractère incrémental du processus par lequel les associations stabilisent leur discours, leur méthodologie et leur intervention concrète dans la prise de décision aux niveaux macro et micro. A cet égard, mettrons en évidence l’importance de la production continue de documents (recommandations, questionnaires, …) stabilisant les éléments-clé de ce discours et permettant aux experts par le vécu de le porter en différents endroits, au sein des institutions des soins et dans la sphère politique. Finalement, nous envisagerons l’hypothèse de la professionnalisation des représentant(e)s des associations et des représentants des usagers, tout en soulignant les enjeux personnels et structurels associés à cette professionnalisation. [less ▲]

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailAutour du sujet défait
Vrancken, Didier ULg

Conference (2015, January 07)

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailEffect of stress path on the miniaturizatio size effect for nickel polycrystals
Keller, Clement; Hug, Eric; Duchene, Laurent ULg et al

Conference (2015, January 04)

The mechanical behavior of mettalic materials deeply depends on the size of samples. For specimen dimensions de creasing from a few millimeters to a few micrometers, the general observed trend is a ... [more ▼]

The mechanical behavior of mettalic materials deeply depends on the size of samples. For specimen dimensions de creasing from a few millimeters to a few micrometers, the general observed trend is a softening of the mechanical behavior in tension which affects the stress level and the strain hardening. This effect is triggered by the derease of the number of grains across the thickness ( also called thickness"t" over grain size "d" ratio). The objective of this work is to provide new experimental results in order to analyse the miniaturization size effects for various stress paths without strain gradients across the thickness of the samples. To this aim, experimental tensil tests, large tensile tests and shear tests have been performed on Ni sheets ( 0.5mm) with various grain sizes ensuring different t/d ratios. Results show that the miniaturization softening is affected by triaxiality, the larger is this parameter, the lower is the mechanicval softening. These features seem to be linked to surface effects which are larger for low triaxiality stress paths. Attempts of numerical simulations using strain gradient crystal plasticity model are also performed to confirm the role played by surface effects. [less ▲]

Detailed reference viewed: 20 (4 ULg)
Full Text
See detailThe X-ray properties of magnetic massive stars
Nazé, Yaël ULg; Petit, Véronique; Rinbrand, Melanie et al

in IAU Symposium (2015, January 01)

Early-type stars are well-known to be sources of soft X-rays. However, this high-energy emission can be supplemented by bright and hard X-rays when magnetically confined winds are present. In an attempt ... [more ▼]

Early-type stars are well-known to be sources of soft X-rays. However, this high-energy emission can be supplemented by bright and hard X-rays when magnetically confined winds are present. In an attempt to clarify the systematics of the observed X-ray properties of this phenomenon, a large series of Chandra and XMM observations was analyzed, over 100 exposures of 60% of the known magnetic massive stars listed recently by Petit et al. (2013). It is found that the X-ray luminosity is strongly correlated with mass-loss rate, in agreement with predictions of magnetically confined wind models, though the predictions of higher temperature are not always verified. We also investigated the behaviour of other X-ray properties (absorption, variability), yielding additional constraints on models. This work not only advances our knowledge of the X-ray emission of massive stars, but also suggests new observational and theoretical avenues to further explore magnetically confined winds. [less ▲]

Detailed reference viewed: 1 (0 ULg)
Full Text
See detailAre the stars of a new class of variability detected in NGC 3766 fast rotating SPB stars?
Salmon, Sébastien ULg; Montalbán, J.; Reese, D. R. et al

in Meynet, Georges; Georgy, Cyril; Groh, Jose (Eds.) et al Proceedings of the International Astronomical Union S307 (2015, January 01)

A recent photometric survey in the NGC 3766 cluster led to the detection of stars presenting an unexpected variability. They lie in a region of the Hertzsprung-Russell (HR) diagram where no pulsation are ... [more ▼]

A recent photometric survey in the NGC 3766 cluster led to the detection of stars presenting an unexpected variability. They lie in a region of the Hertzsprung-Russell (HR) diagram where no pulsation are theoretically expected, in between the δ Scuti and slowly pulsating B (SPB) star instability domains. Their variability periods, between ~0.1-0.7 d, are outside the expected domains of these well-known pulsators. The NCG 3766 cluster is known to host fast rotating stars. Rotation can significantly affect the pulsation properties of stars and alter their apparent luminosity through gravity darkening. Therefore we inspect if the new variable stars could correspond to fast rotating SPB stars. We carry out instability and visibility analysis of SPB pulsation modes within the frame of the traditional approximation. The effects of gravity darkening on typical SPB models are next studied. We find that at the red border of the SPB instability strip, prograde sectoral (PS) modes are preferentially excited, with periods shifted in the 0.2-0.5 d range due to the Coriolis effect. These modes are best seen when the star is seen equator-on. For such inclinations, low-mass SPB models can appear fainter due to gravity darkening and as if they were located between the δ Scuti and SPB instability strips. [less ▲]

Detailed reference viewed: 1 (0 ULg)
Full Text
See detailAn X-ray surprise in a magnetic pulsator
Nazé, Yaël ULg

in IAU Symposium (2015, January 01)

ξ[SUP]1[/SUP] CMa is a rare β Cep star with a strong magnetic field. To gain new insight on this object, a dedicated campaign using XMM-Newton was performed. These data reveal a new type of variations, X ... [more ▼]

ξ[SUP]1[/SUP] CMa is a rare β Cep star with a strong magnetic field. To gain new insight on this object, a dedicated campaign using XMM-Newton was performed. These data reveal a new type of variations, X-ray pulsations, posing a new challenge to our understanding of stellar winds. [less ▲]

Full Text
Peer Reviewed
See detailModelling Hydromechanical Dilation Geomaterial—Cavitation and Localization
Sieffert, Y.; Buzzi, O.; Collin, Frédéric ULg et al

in Chau, Kam Tim; Zhao, Jidong (Eds.) Bifurcation and Degradation of Geomaterials in the New Millennium (2015, January)

This paper presents an extension of the local second gradient model to multiphasic materials (solid particles, air, water) and including the cavitation phenomenon. This new development was made in order ... [more ▼]

This paper presents an extension of the local second gradient model to multiphasic materials (solid particles, air, water) and including the cavitation phenomenon. This new development was made in order to model the response of saturated dilatant materials under deviatoric stress and undrained conditions and possibly, in future, the behaviour of unsaturated soils [less ▲]

Detailed reference viewed: 2 (0 ULg)
Full Text
Peer Reviewed
See detailFood provioning influences ranging patterns in northern pigtailed macaques (Macaca leonina)
Huynen, Marie-Claude ULg; Savini, Tommaso ULg; Asensio, Norberto et al

in International Journal of Primatology (2015, January)

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailAntioxydants et santé : conseils pratiques.
PINCEMAIL, Joël ULg

Conference (2015, January)

Detailed reference viewed: 7 (0 ULg)
See detailMeasurement of Human Internal Cadaveric VOC's by GCxGC-HRTOFMS
Stefanuto, Pierre-Hugues ULg; Varlet, Vincent; Silke et al

Conference (2015, January)

Detailed reference viewed: 12 (2 ULg)
Full Text
Peer Reviewed
See detailMassive stars: privileged sources of cosmic-rays for interstellar astrochemistry
De Becker, Michaël ULg

in Bulletin de la Société Royale des Sciences de Liège (2015, January), 84

Massive stars can be considered as crucial engines for interstellar physics. They are indeed the main providers of UV radiation field, and constitute a substantial source of chemical enrichment. On their ... [more ▼]

Massive stars can be considered as crucial engines for interstellar physics. They are indeed the main providers of UV radiation field, and constitute a substantial source of chemical enrichment. On their evolution time-scale (at most about 10 Myr), they typically stay close to their formation site, i.e. close to molecular clouds very rich in interstellar molecules. These stellar objects have also the property to be involved in particle acceleration processes leading to the production of high energy charged particles (cosmic-rays). After rejection in the interstellar medium, these particles will play a substantial role in processes such as those simulated in various facilities dedicated to experimental astrochemistry. This short contribution intends to put these particles, crucial for astrochemistry, in their adequate astrophysical context. [less ▲]

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailPourquoi la théorie de la connaissance a besoin de la psychologie: les arguments de Stumpf
Dewalque, Arnaud ULg

in Gyemant, Maria (Ed.) Psychologie et psychologisme (2015, January)

Mon objectif est double. Il s’agira, d’une part, de retracer la position de Carl Stumpf face à la querelle du psychologisme (lectures psychologistes de Kant vs lectures antipsychologistes néokantiennes ... [more ▼]

Mon objectif est double. Il s’agira, d’une part, de retracer la position de Carl Stumpf face à la querelle du psychologisme (lectures psychologistes de Kant vs lectures antipsychologistes néokantiennes) et, d’autre part, d’en tirer quelques implications d’allure très générale concernant la place qu’il convient de réserver aux considérations psychologiques en philosophie. Je suggérerai: (1) que Stumpf adopte une voie médiane entre psychologisme et antipsychologisme, (2) que cette voie médiane est représentative de l'orientation philosophique de Brentano et de son école, (3) qu'elle débouche sur une conception fine des rapports entre philosophie (en particulier théorie de la connaissance) et psychologie: la théorie de la connaissance a besoin de la psychologie, sans être à proprement parler "fondée" sur elle. [less ▲]

Detailed reference viewed: 57 (5 ULg)
Peer Reviewed
See detailPrivate Versus Official? New Hypotheses for the Reconstruction of Bronze Age Upper Mesopotamian Economic System
Mas, Juliette ULg

Conference (2015, January)

Ancient economic systems from Southern and Central Mesopotamia are quite well known when Northern Mesopotamia ones remain less known. If we already know that, during Bronze Age, households played a ... [more ▼]

Ancient economic systems from Southern and Central Mesopotamia are quite well known when Northern Mesopotamia ones remain less known. If we already know that, during Bronze Age, households played a deciding role in several kinds of production, their degree of dependence or independence to the State still has to be clarified . The archaeological data clearly show that private workshops, set up in private houses, could be very efficient and specialized. Furthermore, these economic entities could be assimilated to private enterprises, which were able to handle their own administrative duties. On the other hand, we know from the texts that the Palace and the temples were also a main element of ancient economic systems. If public administrations should, in some cases, have supplied raw materials, hired workforce, and dealt with the distribution of produced goods, it seems that the production didn’t take place in the palace itself. Dealing both with archaeological and textual data could help to better define the role and the importance of both public and private components in early Mesopotamian economic systems. [less ▲]

Detailed reference viewed: 12 (10 ULg)
See detailImpact of light and melanopsin on human cognitive brain function
Vandewalle, Gilles ULg

Conference (2015)

Detailed reference viewed: 34 (0 ULg)
Full Text
Peer Reviewed
See detailAnalyzing Access, Egress, and Main Transport Mode of Public Transit Journeys: Evidence from the Flemish National Household Travel Survey
Creemers, Lieve; Bellemans, Tom; Janssens, Davy et al

in Proceedings of the 94th Annual Meeting of the Transportation Research Board (2015)

The primary objective of this paper is to explore the influence of socio-demographic and contextual variables on the multimodal character of public transit journeys. Accounting for multimodality in public ... [more ▼]

The primary objective of this paper is to explore the influence of socio-demographic and contextual variables on the multimodal character of public transit journeys. Accounting for multimodality in public transit journeys is important from a demand modeling point of view, especially in the assessment of new projected public transit infrastructure. To meet the objective, data from the national household travel survey of Flanders (Belgium) is analyzed. Based on 2,202 public transit journeys, the main public transit mode choice (bus/tram/metro or train) and access/egress mode choice are simultaneously estimated using a multinomial logit model, and by explicitly making a distinction between unimodal and multimodal transit journeys. The results indicate that various socio-demographical (e.g. age, gender, level of education, household income) and contextual factors (e.g. journey distance, journey motive, urbanization degree, car availability) significantly influence the joint decision process. Total journey distance and car availability are identified as the most important explanatory variables. In terms of model performance, the model appears to yield satisfactory predictions, justifying the integration of the model in more general demand modeling frameworks. [less ▲]

Detailed reference viewed: 4 (1 ULg)
Full Text
See detailChemical abundances of fast-rotating OB stars
Cazorla, Constantin ULg; Morel, Thierry ULg; Nazé, Yaël ULg et al

in Proceedings of the International Astronomical Union - New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry (2015)

Fast rotation in massive stars is predicted to induce mixing in their interior, but a population of fast-rotating stars with normal nitrogen abundances at their surface has recently been revealed (Hunter ... [more ▼]

Fast rotation in massive stars is predicted to induce mixing in their interior, but a population of fast-rotating stars with normal nitrogen abundances at their surface has recently been revealed (Hunter et al. 2009; Brott et al. 2011, but see Maeder et al. 2014). However, as the binary fraction of these stars is unknown, no definitive statements about the ability of single-star evolutionary models including rotation to reproduce these observations can be made. Our work combines for the first time a detailed surface abundance analysis with a radial-velocity monitoring for a sample of bright, fast-rotating Galactic OB stars to put strong constraints on stellar evolutionary and interior models. [less ▲]

Detailed reference viewed: 25 (18 ULg)
Peer Reviewed
See detailLandslide Susceptibility Mapping with Data Mining Methods—a Case Study from Maily-Say, Kyrgyzstan
Braun, A.; Fernandez-Steeger, T.; Havenith, Hans-Balder ULg et al

in Engineering Geology for Society and Territory-Volume 2 (2015)

Abstract: Multiple factors, such as geology, high mountain topography, seismic activity, climatic conditions and mining activities cause significant landslide hazard in the region around Maily-Say ... [more ▼]

Abstract: Multiple factors, such as geology, high mountain topography, seismic activity, climatic conditions and mining activities cause significant landslide hazard in the region around Maily-Say, Kyrgyzstan. To assess the landslide susceptibility a database containing landslide information and geological, morphological and hydrological parameters associated with landslide occurrence was established and analyzed with different data mining algorithms. The most promising results were achieved with an Artificial Neural ... [less ▲]

Detailed reference viewed: 10 (0 ULg)
Peer Reviewed
See detailValidation and test cases for a free surface PSH model
Goffin, Louis ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

in Advances in hydroinformatics - Simhydro 2014 (2015)

Detailed reference viewed: 20 (4 ULg)
Full Text
See detailThe Harmonic Balance Method for Bifurcation Analysis of Nonlinear Mechanical Systems
Detroux, Thibaut ULg; Renson, Ludovic ULg; Masset, Luc ULg et al

in Proceedings of the SEM IMAC XXXIII (2015)

Because nowadays structural engineers are willing to use or at least understand nonlinearities instead of simply avoiding them, there is a need for numerical tools performing analysis of nonlinear large ... [more ▼]

Because nowadays structural engineers are willing to use or at least understand nonlinearities instead of simply avoiding them, there is a need for numerical tools performing analysis of nonlinear large-scale structures. Among these techniques, the harmonic balance (HB) method is certainly one of the most commonly used to study finite element models with reasonably complex nonlinearities. However, in its classical formulation the HB method is limited to the approximation of periodic solutions. For this reason, the present paper proposes to extend the method to the detection and tracking of codimension-1 bifurcations in the system parameters space. As an application, the frequency response of a spacecraft is studied, together with two nonlinear phenomena, namely quasiperiodic oscillations and detached resonance curves. This example illustrates how bifurcation tracking using the HB method can be employed as a promising design tool for detecting and eliminating such undesired behaviors. [less ▲]

Detailed reference viewed: 101 (19 ULg)
Full Text
Peer Reviewed
See detailEnquêter sur les non-publics de la culture: quelle posture de recherche pour quel dispositif méthodologique?
Ghebaur, Cosmina ULg

in Questions de Communication (2015)

Mes travaux portent sur les non-publics de la culture et leur fabrication institutionnelle, à savoir leur production par les institutions chargées de mettre en œuvre sur un territoire donné les politiques ... [more ▼]

Mes travaux portent sur les non-publics de la culture et leur fabrication institutionnelle, à savoir leur production par les institutions chargées de mettre en œuvre sur un territoire donné les politiques culturelles les concernant. Pour explorer cette question, je me place dans la perspective initiée en sociologie de l'art par Pascale Ancel et Alain Pessin (2004) et caractérisée par la remise en question de la frontière entre publics et non-publics. On peut, écrit Martine Azam (2004), être " à la fois " public et non-public s'agissant de deux objets culturels différents ou du même objet à des moments différents. L'objectif de cet article est d'expliciter les principaux choix méthodologiques que j'ai été amenée à faire en enquêtant, avec cette posture de recherche, sur une exposition photographique en extérieur organisée dans une ville de la banlieue parisienne. [less ▲]

Detailed reference viewed: 16 (2 ULg)
Full Text
Peer Reviewed
See detailAntoninos de Cos, les lophoura et les soins vétérinaires
Marganne, Marie-Hélène ULg

in Doyen-Higuet, Anne-Marie; Van den Abeele, Baudouin (Eds.) Chevaux, chiens, faucons. L’art vétérinaire antique et médiéval à travers les sources écrites, archéologiques et iconographiques (Louvain-La-Neuve, 24-26 mars 2011) (2015)

Poursuivant les recherches ébauchées à propos d'Antoninos de Cos, dont le nom apparaît, à propos de soins vétérinaires, dans un papyrus grec daté du début du IIIe siècle de notre ère réédité récemment par ... [more ▼]

Poursuivant les recherches ébauchées à propos d'Antoninos de Cos, dont le nom apparaît, à propos de soins vétérinaires, dans un papyrus grec daté du début du IIIe siècle de notre ère réédité récemment par nos soins (Matière médicale ou doxographie ? Révision de PSI inv. 3011 [MP3 2388], dans V. Boudon-Millot – A. Garzya – J. Jouanna & A. Roselli (éd.), Histoire de la tradition et édition des médecins grecs. Actes du VIe Colloque international, Paris, 12-14 avril 2008, Napoli, 2010, pp. 43-59 [Collectanea, 27]), on s'attache à rassembler les fragments qui pourraient être attribués à cet auteur, qu'ils relèvent de la médecine humaine ou vétérinaire, à retracer tant leur contexte chronologique que les étapes de leur transmission, à analyser leur contenu et à définir enfin leur apport à la connaissance de l'art vétérinaire antique et de son expression écrite. [less ▲]

Detailed reference viewed: 52 (7 ULg)
Peer Reviewed
See detailSignes et corrections dans le P.Vat. gr. 11v - Favorinos, De exsilio
Macedo, Gabriel ULg

in Marganne, Marie-Hélène; Amato, Eugenio (Eds.) Entre papyrologie, philologie et littérature. Autour du traité "Sur l'Exil" de Favorinos d'Arles. Actes de la journée d'études, Nantes 13-11-2013 (2015)

A study of scribal practices, signs and corrections on the only known copy of Favorinos' De exsilio.

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailLes frontières du droit à l'épreuve des films de mafias
Thirion, Nicolas ULg; Pasteger, David ULg

in Flores-Lonjou, Magalie (Ed.) Frontière(s) au cinéma - Actes des septièmes rencontres "Droit et cinéma" (2015)

demander dans quelle mesure l’injonction du brigand qui exige « la bourse ou la vie ! » peut être comparée à la norme de comportement édictée par un Etat sous la forme d’une loi, c’est poser la ... [more ▼]

demander dans quelle mesure l’injonction du brigand qui exige « la bourse ou la vie ! » peut être comparée à la norme de comportement édictée par un Etat sous la forme d’une loi, c’est poser la sempiternelle question de la frontière qui sépare le droit du non-droit, tout au moins dans une perspective juspositiviste, en tant que cette école de théorie du droit refuse de définir le phénomène juridique en se référant à une valeur ou un ensemble de valeurs. La frontière du droit et du non-droit est en effet particulièrement difficile à tracer, nonobstant plusieurs siècles de discussions philosophiques à ce sujet. Lorsque, fatigué de parcourir les chemins, le brigand décide de s’installer en ville pour s’y adonner au racket des commerçants du quartier et qu’il s’adjoint ensuite le concours d’autres bandits, c’est un gang de malfaiteurs qui voit le jour. Si, ultérieurement, ce gang se concerte avec d’autres bandes de truands pour s’épauler mutuellement dans les exactions auxquelles ils se livrent sur leurs territoires respectifs, il prend alors la forme d’une organisation criminelle ou, au sens large du terme, d’une « mafia ». Le cinéma de Francis Ford Coppola, Martin Scorsese, Brian De Palma, Sergio Leone ou bien encore Matteo Garrone, entre autres, dépeint, souvent avec réalisme, la genèse et le fonctionnement de telles organisations criminelles. La communication a proposé, au moyen d’illustrations tirées des films de ces grands cinéastes, une analyse de microscopie juridique du crime organisé. Une description serrée de la particule élémentaire du phénomène juridique, identifiée par Lucien François dans son ouvrage de théorie du droit Le cap des Tempêtes sous l’appellation de « jurème », met en lumière une indéniable proximité entre les techniques de pouvoir utilisées respectivement par le brigand isolé, la bande organisée et l’Etat souverain. En remontant ensuite vers la structure plus complexe d’un système étatique, on se demandera si, en fin de compte, dans la vision juspositiviste poussée au bout de sa logique par Lucien François, l’Etat ne pourrait être réduit, d’un point de vue ontologique, à un pouvoir de fait comparable, par les techniques de contrainte qu’il exerce sur ses sujets, à une organisation criminelle – abstraction faite des valeurs promues ou poursuivies par tel ou tel appareil étatique. [less ▲]

Detailed reference viewed: 45 (13 ULg)
Peer Reviewed
See detailSignes et corrections dans le P.Vat. gr. 11v - Favorinos, De exsilio
Macedo, Gabriel ULg

in Marganne, Marie-Hélène; Amato, Eugenio (Eds.) Entre papyrologie, philologie et littérature. Autour du traité "Sur l'Exil" de Favorinos d'Arles. Actes de la journée d'études, Nantes 13-11-2013 (2015)

A study of scribal practices, signs and corrections on the only known copy of Favorinos' De exsilio.

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailLa ‘Commendatio animæ’ dans les littératures romanes des origines
Valenti, Gianluca ULg

in Draelants, Isabelle; Balouzat-Loubet, Christelle (Eds.) La formule au Moyen Âge, II / Formulas in Medieval Culture, II. Actes du colloque international / Proceedings of the International Conference (2015)

Detailed reference viewed: 2 (1 ULg)
Peer Reviewed
See detailHazard and Risk Related to Earthquake-Triggered Landslides
Havenith, Hans-Balder ULg; Fan, X.; Torgoev, A.

in Engineering Geology for Society and Territory-Volume 2 (2015)

Abstract This paper first analyses how important earthquake-induced landslide hazards are compared to other geohazards at world-wide scale. Further, we will outline where these hazards may have the ... [more ▼]

Abstract This paper first analyses how important earthquake-induced landslide hazards are compared to other geohazards at world-wide scale. Further, we will outline where these hazards may have the strongest impacts—at regional and local scale. In this regard, we consider the short-and long-term effects of geological, tectonic, climatic and morphological conditions. Hazard and risk related to these processes will also be analysed on the basis of a series of case histories: eg, the 1920 Haiyuan earthquake-landslide disaster in China. A ... [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailCombining satellite, aerial and ground measurements to assess forest carbon stocks in Democratic Republic of Congo
Beaumont, Benoît; Bouvy, Alban; Stephenne, Nathalie et al

in Geophysical Research Abstracts, Vol. 17, EGU2015-4765-2, 2015 (2015)

Monitoring tropical forest carbon stocks changes has been a rising topic in the recent years as a result of REDD+ mechanisms negotiations. Such monitoring will be mandatory for each country willing to ... [more ▼]

Monitoring tropical forest carbon stocks changes has been a rising topic in the recent years as a result of REDD+ mechanisms negotiations. Such monitoring will be mandatory for each country willing to benefit from these financial incentives in the future. Aerial and satellite remote sensing technologies offer cost advantages in implementing large scale forest inventories. Despite the recent progress made in the use of airborne LiDAR for C stocks estimation, no widely operational and cost effective method has yet been delivered for central Africa forest monitoring. Within the Maï Ndombe region of DRC, the EO4REDD project develops a method combining satellite, aerial and ground measurements. This combination is done in three steps: [1] mapping and quantifying forest cover changes using an object-based semi-automatic change detection (deforestation and forest degradation) methodology based on very high resolution satellite imagery (RapidEye), [2] developing an allometric linear model for above ground biomass measurements based on dendrometric parameters (tree crown areas and heights) extracted from airborne stereoscopic image pairs and calibrated using ground measurements of individual trees on a data set of 18 one hectare plots and [3] relating these two products to assess carbon stocks changes at a regional scale. Given the high accuracies obtained in [1] (> 80% for deforestation and 77% for forest degradation) and the suitable, but still to be improved with a larger calibrating sample, model (R2 of 0.7) obtained in [2], EO4REDD products can be seen as a valid and replicable option for carbon stocks monitoring in tropical forests. Further improvements are planned to strengthen the cost effectiveness value/REDD+ suitability in the 2nd phase of EO4REDD. This 2nd phase will include [A] specific model developments per forest type; [B] measurements of afforestation, reforestation and natural regeneration processes and [C] study of Sentinel data series potential use. [less ▲]

Detailed reference viewed: 8 (1 ULg)
Peer Reviewed
See detailInvolvement of the Distinctiveness Heuristic in Children's Decision Making
Geurten, Marie ULg; Willems, Sylvie ULg; Meulemans, Thierry ULg

in International Convention of Psychological Science: ICPS, Amsterdam 2015 (2015)

Over the past decades, researchers studying adult metacognition have placed a heavy emphasis on how expectations and naïve theories about memory functioning can improve memory accuracy through the ... [more ▼]

Over the past decades, researchers studying adult metacognition have placed a heavy emphasis on how expectations and naïve theories about memory functioning can improve memory accuracy through the implementation of some metacognitive rules. By contrasts, however, research on metacognition in children has only recently started to pay attention to the influence of these heuristic-based judgments on decision making. Generally, the results of these studies indicate that memory decisions are already based on some heuristics by the ages of 7-8 years. Thus far, the question of whether younger children can do the same has widely gone unexamined. The present experiment investigates whether young children are able to reduce their false recognitions rate after distinctive encoding through the implementation of a strategic metacognitive rule. Specifically, we examine the use of a retrieval strategy called the distinctiveness heuristic whereby people infer that an event has not occurred when they cannot remember expected memorial information about it. Seventy-two children, aged 4, 6, and 9 years, studied two lists of unrelated items. One of these lists was visually displayed (picture/dictinctive condition) while the other was presented auditorily (word/no-distinctive condition). After each study phase, participants completed recognition tests. Finally, they answered questions about their explicit knowledge of the distinctive-encoding effect. The results revealed that even the youngest children in our sample showed a smaller proportion of intrusions in the picture condition than in the word condition. Furthermore, the findings of the signal detection analyses are consistent with the hypothesis that the lower rate of false recognitions after picture encoding results from the implementation of a conservative response criterion based on the participants’ metacognitive expectations (distinctiveness heuristic). Moreover, the absence of correlation between children’s explicit knowledge of the distinctiveness rule and their effective use of this metacognitive heuristic seems to indicate that its involvement in memory decisions could be mediated by implicit mechanisms. [less ▲]

Detailed reference viewed: 17 (0 ULg)
Peer Reviewed
See detailGIS-Based Landslide Susceptibility Mapping in the Great Lakes Region of Africa, Case Study of Bujumbura Burundi
Nibigira, L.; Draidia, Salah ULg; Havenith, Hans-Balder ULg

in Engineering Geology for Society and Territory-Volume 2 (2015)

Abstract: Landslides in Central Africa represent a constant threat to the population. The present work took its motivation from the increasing number of recorded incidents in recent times. It is focused ... [more ▼]

Abstract: Landslides in Central Africa represent a constant threat to the population. The present work took its motivation from the increasing number of recorded incidents in recent times. It is focused on the analysis of mass movements in a regional context. Remote sensing based on the use of satellite images (Pleiades images of 2011) and aerial photographs (1957, 1958 and 1981) allowed us to identify instabilities at different scales. The study of these mass movements and the characterization of the processes governing ... [less ▲]

Detailed reference viewed: 15 (1 ULg)
Full Text
See detailAnalytic solution for the relative motion of satellites in near-circular low-Earth orbits
Martinusi, Vladimir ULg; Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Proceedings of the AAS/AIAA Space FLight Mechanics Meeting (2015)

The paper presents the solution to the problem of the relative motion between two satellites orbiting Earth under the influence of the oblateness and atmospheric drag perturbations. Starting from the ... [more ▼]

The paper presents the solution to the problem of the relative motion between two satellites orbiting Earth under the influence of the oblateness and atmospheric drag perturbations. Starting from the analytic solution to the problem of the absolute motion, the closed-form equations of motion are obtained. No simplifying assumptions are made on the relative dynamics. [less ▲]

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailLe Transport de marchandises et de personnes sur le Nil en 823 A.H./1420 È.C.
Bauden, Frédéric ULg

in Schubert, Alexander T.; Sijpesteijn, Petra M. (Eds.) Documents and the History of the Early Islamic World (2015)

Detailed reference viewed: 230 (20 ULg)
Full Text
See detailNavigating the uncertain seas of controversies – A pedagogical wind rose
Verpoorten, Dominique ULg

in Melard, François; Stassart, Pierre M (Eds.) Proceedings of the International Interdisciplinary Working Conference "Teaching complexity and uncertainty on Environmental Issues - Practices, Theories and Products" (2014, December 23)

The Arlon conference brought together lecturers willing to share and discuss aspects of their practice of “controversies”, seen as a teaching/learning method suited to the contextual needs and demands of ... [more ▼]

The Arlon conference brought together lecturers willing to share and discuss aspects of their practice of “controversies”, seen as a teaching/learning method suited to the contextual needs and demands of higher education environmental studies. The paper contributes to this joint reflective effort by providing conceptual tools helping to interpret the practice, to question what it puts at stake and to detect, from a pedagogical viewpoint, key issues and upcoming questions. The contribution falls within the Conference's aim n°2: “share theories or conceptual propositions that make it possible to equip the teaching approaches and to give them theoretical and methodological foundations” (Program Arlon Conference 2014, p. 2). The article takes a traditional stance, looking at the contributions to the conference through “constructive alignment”(Biggs, 1996), a basic principle meant to secure the pedagogical validity of any given learning situation by establishing a triple consistency (Kovertaite & Leclercq, 2006; Leclercq, 1995; Petit, Castaigne, & Verpoorten, 2007; Tyler, 1949) between objectives, methods and assessment. [less ▲]

Detailed reference viewed: 90 (4 ULg)
Full Text
See detailThe Politics of National Accounting: Assessing Walloon Public Debt
Piron, Damien ULg

Conference (2014, December 19)

Detailed reference viewed: 22 (0 ULg)
Full Text
Peer Reviewed
See detailSize Matters, book-to-market does not! The F&F empirical CAPM revisited
Lambert, Marie ULg; Hübner, Georges ULg

Conference (2014, December 18)

Detailed reference viewed: 45 (0 ULg)
Peer Reviewed
See detailUncertainty in Training-Image Based Inversion of Hydraulic Head Data Constrained to ERT Data: Workflow and Case Study
Hermans, Thomas ULg; Nguyen, Frédéric ULg; Caers, Jef

Conference (2014, December 18)

In inverse problems, investigating the relationship between data and prior models and the uncertainty related to the posterior distribution of model parameters are as important as matching the data. In ... [more ▼]

In inverse problems, investigating the relationship between data and prior models and the uncertainty related to the posterior distribution of model parameters are as important as matching the data. In recent years, many efforts have been done to assess the posterior distribution of a given problem with reasonable computational costs through inversion techniques such as McMC. The derived posterior distribution is always dependent on the prior distribution. However, most of the studies ignore modeling the prior with realistic uncertainty. In this paper, we propose a workflow to assess the uncertainty of inversion of hydraulic heads data through the addition of electrical resistivity tomography (ERT) constraining data. The workflow is divided in three successive steps: 1) Construction of prior: we generate multiple alternative geological scenarios from literature data (architecture of facies) as well as site specific data (proportions of facies). Spatial uncertainty within each scenario is integrated hierarchically through geostatistics (multiple-point statistics simulation of facies constrained by ERT data as soft data). 2) Validation of prior scenarios: we transform prior facies scenarios into resistivity distribution scenarios through forward and inverse modeling. The scenarios are validated by comparison with field ERT data. The comparison is made through distance calculation and projection into a low dimensional space to calculate the probability of each scenario given field ERT data. 3) Matching dynamical data: we use the probability perturbation method, within each scenario, to integrate hydraulic heads to our models. We account for scenario probabilities, calculated in 2, in determining how many models per scenario we have to consider for building a reliable posterior distribution. As an illustration, the method is applied on a field case study in an alluvial aquifer (Belgium) where we consider prior uncertainty related to the type of elements (gravel channels or bars) and to their size. This study shows the importance of considering the uncertainty of the prior in inverse problems as it has a strong influence on model predictions and decision-making problems. [less ▲]

Detailed reference viewed: 55 (3 ULg)
Full Text
Peer Reviewed
See detailDe l’intention au comportement physiquement actif chez les seniors : étude de l’influence des perceptions environnementales
Mouton, Alexandre ULg; Peels, Denise; Bolman, Catherine et al

Conference (2014, December 17)

The aim of this study was to analyse whether the perception of the local opportunities and the perception about the quality of the environment for physical activity (PA) mediate or moderate the intention ... [more ▼]

The aim of this study was to analyse whether the perception of the local opportunities and the perception about the quality of the environment for physical activity (PA) mediate or moderate the intention-behaviour relationship for PA in older adults. Data from two existing longitudinal studies (n = 149 and n = 1262) were used, assessing intention at baseline (T1), environmental variables at six months (T2) and PA behaviour at one year (T3). Results exposed a significant mediating role of the perception of the local PA opportunities (accounting for 15.5% in study 1 and 11.9% in study 2) and of the perception about the quality of the PA environment (accounting for respectively 19.6% and 18.2%) on the intention-behaviour relationship for PA. A moderation effect on the intention-behaviour relationship for PA was found in participants with a moderate perception of the local PA opportunities and in participants with a low or moderate perception about the quality of the environment for PA in both studies. This is the first longitudinal study that provides insight in the mediating and moderating role of environmental perceptions in the intention-behaviour relation for PA. Improving environmental perceptions could help future PA promotion interventions to bridge the intention-behaviour gap. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailCancer du sein et retour au travail
Schippers, Nathalie ULg; Van Hoof, Elke; Mairiaux, Philippe ULg

Poster (2014, December 17)

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailAllergie moléculaire & Diagnostic in-vitro, Optimalisation de la prescription
GADISSEUR, Romy ULg

Conference (2014, December 17)

Detailed reference viewed: 12 (3 ULg)
Peer Reviewed
See detailPersonnel soignant et âgisme: quelles conséquences cliniques ?
Schroyen, Sarah ULg; Missotten, Pierre ULg; JERUSALEM, Guy ULg et al

Conference (2014, December 16)

Introduction : Le cancer est un problème de santé majeur dont l’âge constitue un facteur de risque avéré1. Paradoxalement, les personnes âgées souffrant d’un cancer sont souvent exclues des essais ... [more ▼]

Introduction : Le cancer est un problème de santé majeur dont l’âge constitue un facteur de risque avéré1. Paradoxalement, les personnes âgées souffrant d’un cancer sont souvent exclues des essais cliniques et sous-traitées comparativement à des patients plus jeunes1. Un élément explicateur de ces constats est la stigmatisation liée à l’âge² (c.à.d. nos stéréotypes liés à l’âge, et donc l’âgisme). Méthodologie : Nous avons interrogé 76 infirmiers (-ères) travaillant en oncologie. A l’aide de fiches cli-niques, nous leur avons demandé s’ils encourageraient à des patients un traitement expérimental (40 vs 70 ans), une chimiothérapie ou une reconstruction mammaire (35, 55 ou 75 ans), tout paramètres cliniques étant équivalents par ailleurs. Résultats : L’encouragement d’un traitement expérimental est moins fréquente pour une personne de 70 ans comparativement à une personne de 40 ans (p<.001). De plus, le personnel soignant encourage moins fréquemment une chimiothérapie pour une personne de 75 ans comparativement aux per-sonnes de 55 et 35 ans (p<.001). Au niveau de la reconstruction mammaire, une différence est vi-sible dès 55 ans : la reconstruction mammaire est moins encouragée pour une personne de cet âge par rapport à une personne de 35 ans (p=.02) et encore moins encouragée pour une personne de 75 ans comparativement à une personne de 55 ans (p<.001). L’âge des infirmiers (M = 35.8) a une influence sur ces encouragement : plus ils sont âgés, plus ils encouragent le traitement chimiothérapeutique d’une per-sonne de 75 ans (p = .005) de même que le traitement expérimental pour une personne de 70 ans (p = .01). Conclusion : A l’instar d’autres études3, 4, nous confirmons que tant du point de vue esthétique que cura-tif, le personnel médical encourage moins fréquemment un traitement aux patients plus âgés compa-rativement aux plus jeunes. 1. Hurria, A., et al. (2012). J Natl Compr Canc Netw, 10, 162-209. 2. Penson, R. T., et al. (2004). The Oncologist, 9, 343-352. 3. Madan, A. K., et al. (2001). Acad Med, 76, 282-284. 4. Protière, C., et al. (2010). Crit Rev Oncol Hematol, 75, 138-150. [less ▲]

Detailed reference viewed: 26 (6 ULg)
Peer Reviewed
See detailAnxiété et dépression chez l'enfant parentifié. Mieux identifier pour mieux intervenir.
Haxhe, Stéphanie ULg; Stassart, Martine ULg; D'Amore, Salvatore ULg

Poster (2014, December 16)

La parentification reste un phénomème mal connu. Pourtant, les conséquences pour l'enfant sont à prendre au sérieux.

Detailed reference viewed: 15 (0 ULg)
Full Text
See detailPhytochemical Study of Plants of Interest for Cosmetics in Mayotte
Saive, Matthew ULg; Fauconnier, Marie-Laure ULg; Danflous, Jean-Paul

Poster (2014, December 16)

This study takes place in a bigger project aiming to identify and to make an inventory of the French Pharmacopeia. Its aim is to identify plants or plant families regularly used in traditional cosmetics ... [more ▼]

This study takes place in a bigger project aiming to identify and to make an inventory of the French Pharmacopeia. Its aim is to identify plants or plant families regularly used in traditional cosmetics in Mayotte. In order to give a direction to the research, two technics where used. At first, the plants and their families used in the pharmacopeia of neighboring regions were inventoried using the literature. The resulting inventory was then compared with the flora of the Mahoran territory. The second technique was the realization of a semi-structured survey with people known for their plant-use knowledge in Mayotte. In order to have significant results, the ethnobotanical survey was done following Trotter & Logan’s protocol. (1986) According to that protocol, the gathered data has to be the following: common name, place of harvest, part used and the posology. Moreover the number of informant has to be big enough in order to integrate the data in several indicators such as: The informant agreement ration (IAR), the fidelity level (FL) and use value (UV). The number of informant was determined based on the population density of the different communes of the island. Another critical factor for this study is the correct identification of each sample. To achieve that when a sample was realized, it was taken twice. One for the analysis, the second sample was pressed and dried so as to enter a herbarium for identification. The last important step of this part of the study is the development of fast technics to establish the samples’ physiological activity. These test will give us qualitative information in order the isolate the plants that show a true potential. The targeted activities and tests being: - Anti-tyrosinase activity through an inhibition of tyrosinase test. - Anti-free-radicals activity through the DPPH test. - Anti-inflammatory activity through an inhibition of lipoxygenase an cyclooxygenase test The following steps of the study is the complete analysis of the physiologically active plants extracts in order to identify the active molecules. The end of the study will result in the creation of cosmetics originating from Mayotte’s flora. The way the cosmetics will be developed is thought so as it can be easily and durably done in Mayotte allowing this study to have a positive impact on the development of the island. [less ▲]

Detailed reference viewed: 17 (1 ULg)
Peer Reviewed
See detailVieillissement réussi: quel lien avec la qualité de vie des personnes âgées?
Missotten, Pierre ULg; Dupuis, Gilles; Adam, Stéphane ULg

Conference (2014, December 16)

Introduction: Selon des théories du « bien vieillir », un sujet doit 1) vivre dans le présent et se focaliser sur des informations émotionnelles positives si il a un sentiment de finitude élevé (FTP)1 ; 2 ... [more ▼]

Introduction: Selon des théories du « bien vieillir », un sujet doit 1) vivre dans le présent et se focaliser sur des informations émotionnelles positives si il a un sentiment de finitude élevé (FTP)1 ; 2) sélectionner des tâches prioritaires (SOC-Sélection) pour les pratiquer plus (SOC-Optimisation) tout en modifiant ses manières de procéder (SOC-Compensation)2 ; 3) réajuster ses buts en tenant compte des limitations de l’environnement ou du self (Flexibilité) et non essayer de changer la situation existante (Ténacité)3. Si on peut penser que ces théories sont liées à la qualité de vie (qdv), aucune recherche empirique n’a testé ces liens. Méthodologie: Cette étude investigue dans quelle mesure les opérationnalisations de trois théories du vieillissement réussi (SOC, FTP, Flexibilité-Ténacité) sont bien liées à la qualité de vie (WHOQOL-OLD et ISQV-65+ bref©) de personnes âgées de plus de 65 ans vivant à domicile (n=61). Résultats: Un faible sentiment de finitude (FTP), une tendance à investir son énergie dans les buts importants (SOC-Optimisation), à chercher des alternatives (SOC-Compensation) et une bonne capacité de réajustement des buts (Flexibilité) constituent des indices liés à une meilleure Qdv (tous r>.30 mais <.70; p<.05). Conclusion: Le vieillissement réussi est bien lié à la qdv: les deux concepts sont différents mais complémentaires. En regard de la théorie FTP, il est toutefois nécessaire de déterminer si la mauvaise qdv des sujets ayant un sentiment de finitude élevé est causée par le fait de ne pas vivre dans le présent et de ne pas s’orienter vers des buts émotionnels. 1. Carstensen, L. (1995). Current Directions in Psychological Science, 4, 151-156. 2. Baltes & Baltes (1990). In P. B. Baltes & M. M. Baltes (Eds.), Successful aging: Perspectives from the behavioral sciences (pp. 1–34). New York: Cambridge University Press. 3. Brandtstädter, J. & Renner, G. (1990). Psychology and Aging 5 (1), 58–67. [less ▲]

Detailed reference viewed: 20 (2 ULg)
Full Text
See detailVariability of Jupiter’s Main Auroral Emission in Response to Magnetospheric Hot Plasma Injections
Badman, Sarah; Bonfond, Bertrand ULg; Fujimoto, Masaki et al

Poster (2014, December 16)

We present observations of Jupiter’s FUV aurora acquired by the Hubble Space Telescope during a two-week interval in January 2014. The variability of the main auroral emission was studied using ... [more ▼]

We present observations of Jupiter’s FUV aurora acquired by the Hubble Space Telescope during a two-week interval in January 2014. The variability of the main auroral emission was studied using latitudinal profiles of intensity. The main oval intensity was found to be reduced when bright patches of diffuse emission were present at lower latitudes. These low latitude emissions are interpreted as the signatures of hot plasma injections from the outer magnetosphere, a process which has previously been related to interchange between the flux tubes from the outer magnetosphere and outward-moving flux tubes loaded with iogenic plasma. The main emission was also observed to broaden and shift in latitude, and occasionally display a double peak structure. These observations are interpreted with reference to the expected changes in auroral field-aligned currents associated with the replacement of the radially-stretched, mass-loaded flux tubes in the middle magnetosphere by more dipolar flux tubes containing rarefied hot plasma. [less ▲]

Detailed reference viewed: 10 (0 ULg)