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See detailRé-Créations Familiales: ruptures, pertes et nouvelles appartenances
D'Amore, Salvatore ULg

Conference (2014, November 14)

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See detailIs there a global procedural learning deficit in children with Specific Language Impairment ?
Desmottes, Lise ULg; Maillart, Christelle ULg; Lejoly, Kelly ULg et al

Poster (2014, November 13)

The study of procedural learning abilities in children with Specific Language Impairment (Procedural Deficit Hypothesis, PDH; Ullman & Pierpont, 2005) remains a relatively unexplored field of research ... [more ▼]

The study of procedural learning abilities in children with Specific Language Impairment (Procedural Deficit Hypothesis, PDH; Ullman & Pierpont, 2005) remains a relatively unexplored field of research. Since most evidence comes from studies using tasks which involve learning of sequenced patterns, research using other procedural learning paradigms (like motor adaptation tasks) is needed to further evaluate the PDH in children with Specific Language Impairment (SLI). Therefore, in this study, we examined the ability of children with and without SLI to learn, consolidate and generalize a mirror-tracing task, a paradigm that does not involve sequence learning and had never been used in SLI. Children with SLI and typical developing (TD) matched children participated in the study. Children with SLI were included if they scored below -1.25 SD of the expected normative performance in at least 2 language areas. Both groups had to trace ten 5-pointed stars seen only in mirror-reversed view in two learning sessions separated by a one-week delay. The transfer phase consisted in tracing a new figure. The time required to complete the tracing, and the number of errors committed were recorded. Full results will be presented and discussed during the presentation of the paper. [less ▲]

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See detailElectrical modelling of interface traps in GeSn MOS structures
Baert, Bruno ULg; Cerica, Delphine ULg; Schmeits, Marcel ULg et al

Conference (2014, November 13)

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See detailL’impact de la gestion des obstacles à la libre circulation des poissons
Ovidio, Michaël ULg

Conference (2014, November 13)

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See detailApproche électro-physiologique non invasive des malformations du développement cortical: EEG
RIKIR, Estelle ULg

Conference (2014, November 13)

L’électro-encéphalogramme (EEG) de surface, technique non invasive et peu couteuse, demeure la pierre angulaire de la mise au point des épilepsies. Le développement de dispositifs d’enregistrement au ... [more ▼]

L’électro-encéphalogramme (EEG) de surface, technique non invasive et peu couteuse, demeure la pierre angulaire de la mise au point des épilepsies. Le développement de dispositifs d’enregistrement au moyen de 64 à 256 électrodes a permis d’augmenter considérablement la résolution spatiale de l’EEG de surface (Lantz et al., Clin Neurophysiol 2003). D’autre part, le développement de l’imagerie de source électrique (ISE) a permis au moyen de modèles mathématiques de localiser le générateur cortical responsable du signal EEG enregistré en surface (Scherg et al., 1990; Pascual-Marqui, 2002). Les malformations corticales (MCs) représentent un large spectre d’anomalies structurelles congénitales (Barkovich et al., Brain 2012) et constituent une des principales causes d’épilepsie de l’adulte (Spencer & Huh, Lancet Neurol 2008). Cette épilepsie s’avère malheureusement pharmaco-résistante dans la plupart des cas (85%) (Papayannis et al., Seizure 2012). Si les MCs sont hétérogènes d’un point de vue structurel (radiologique et anatomopathologique), les études électro-physiologiques (EEG) ont démontré que cette hétérogénéité existait également au niveau fonctionnel, non seulement entre les différents types de MCs mais aussi parfois au sein d’une même malformation. Les dysplasies corticales focales (DCF), hautement épileptogènes (Chassoux et al., Brain 2000; Aubert et al., Brain 2009), restent « invisibles » à l’IRM dans 30 à 50 % des cas (Hauptman et al., Epilepsia 2012). Dans ce cas, l’EEG de surface et l’ISE aident à la localisation du foyer épileptique (Brodbeck et al., Epilepsia 2010; Rikir et al.,Epilepsia 2014). Morphologiquement, aucune anomalie en EEG de surface n’est spécifique d’une DCF (Sisodiya et al., Lancet Neurol 2009). Les MCs, notamment les schizencéphalies et polymicrogyries, sont parfois très vastes et impliquent structurellement plusieurs régions lobaires et sous-lobaires, compliquant l’approche chirurgicale. L’EEG haute résolution couplé à l’ISE peut montrer le caractère hétérogène de la malformation en terme d’épilpetogénicité et désigner ainsi la partie impliquée dans les crises d’épilepsie (Rikir et al., 2014 ; Maillard et al., 2009). En cas de malformation multifocale (sclérose tubéreuse de Bourneville, hétérotopies nodulaires), les anomalies EEG critiques et inter-critiques désignent parfois une origine unifocale des crises épileptiques rendant éventuellement possible un traitement chirurgical. Enfin, il a été montré prospectivement que l’EEG haute densité couplé à l’ISE contribuait à localiser la zone épileptogène dans les épilepsies en rapport les MCs , qu’il présentait une valeur ajoutée par rapport à une mise au point classique basée sur l’enregistrement VIDEOEEG et l’IRM cérébrale, et qu’il était particulièrement indiqué en cas d’IRM négative ainsi qu’en cas de discordance entre hypothèses électro-cliniques (VIDEOEEG) et données structurelles (IRM) (Rikir et al., Epilepisa 2014). [less ▲]

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See detailSanté mentale et travail - les enjeux sociétaux
Mairiaux, Philippe ULg

Conference (2014, November 13)

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See detailWhen food cultures meet. Ethnographic analysis of belongings and positionings.
Mescoli, Elsa ULg

Poster (2014, November 13)

The displacement of human beings is always accompanied by the movement of things and practices which travel with them. This is an obvious statement that indeed leads to interesting studies on the material ... [more ▼]

The displacement of human beings is always accompanied by the movement of things and practices which travel with them. This is an obvious statement that indeed leads to interesting studies on the material culture involved by people’s mobility. Within this culture are food habits, objects of numerous scholars’ researches often focusing on culinary changes (or resistances) linked to migration paths. Far for being the only issue at stake when studying migrant’s food practices – moreover frequently assumed as originally static prior to migration –, this matter is likely to overshadow other significant dynamics. Such as those which occur when supposedly different food cultures meet, thus leading to the mobilization of belongings by groups who want to take a specific position toward one another. My paper is aimed at analysing this encounter. The assumption is that it shapes a space which corresponds to a tertium quid, that is a dimension where not only the boundaries of food cultures fade, proving of an original indeterminacy and interchangeability of practices, but also where individuals constantly change their reciprocal position depending on the perspective of the gaze upon them. To show these dynamics, I will present the ethnographic data stemmed from my doctoral research about the culinary practices of a group of Moroccan migrant women living in Milan hinterland. I will support my presentation with visual materials collected during an eighteen month fieldwork which included observations and interviews inside homes as well as in public events such as an Arab cooking class. [less ▲]

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See detailInfluence de la vitesse de croissance sur le classement de lames de bardage de Douglas wallon (Belgique)
Pollet, Caroline; Henin, Jean-Marc; Hebert, Jacques ULg et al

Poster (2014, November 12)

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See detailChocolate : Natural but also chemical product…
Echterbille, Julien ULg

Conference (2014, November 12)

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See detailLa francophonie dans tous ses états
Baiwir, Esther ULg

Conference (2014, November 12)

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See detailSmart cross-linked polymer micelles for drug delivery
Riva, Raphaël ULg; Vanslambrouck, Stéphanie ULg; Ergül, Zeynep ULg et al

Conference (2014, November 11)

Nowadays, polymer crosslinking is widely used in industry to improve or to impart new properties to existing polymer material. In the pharmaceutical field, polymer crosslinking is of great interest for ... [more ▼]

Nowadays, polymer crosslinking is widely used in industry to improve or to impart new properties to existing polymer material. In the pharmaceutical field, polymer crosslinking is of great interest for the elaboration of drug delivery devices, mostly hydrogels. Nevertheless, crosslinking is also very useful in nanovectorization of active principle. Indeed, each day, new drugs are synthesized and available on the market but in too many cases, the high hydrophobicity of some drugs makes them useless because of the absence of an appropriated administration method. The encapsulation of the drug into a nanocarrier, typically in the hydrophobic core of a polymer micelle, allows a significant increase of the drugs concentration in water in addition to the protection of the active principle against degradation. However, polymer micelles suffer of the main drawback to not be stable, leading to a premature release of the drug, when the concentration falls down the critical micellar concentration (CMC), which it is rapidly observed after intravenous injection. In order to get rid of the CMC, crosslinking of the micelle core is the most proposed strategy. Nevertheless, the crosslinking of the micelle core may have a non-negligible effect on the drug loading but mainly on the drug release due to the sequestration of the drug in the network. Over the last years, our lab investigated several strategies for the crosslinking of the micelle core made of amphiphilic and biocompatible block copolymers generally by UV radiation in order to fulfill the increasingly stringent requirements of biomedical applications. These strategies are very helpful to prepare injectable nanosized cross-linked particles loaded with an active particle. For some systems, the effect of the crosslinking rate on the drug loading and the drug release was evaluated using a model drug. As the crosslinking may interfere with the drug release after internalization of the carrier into the cell, a reversible crosslinking of the micelle core was proposed. Typically, the introduction of disulfide bond as inter-chain links allowed to delay the drug release by diffusion whereas into the cell, the reduction of the disulfide bridges into corresponding thiol led to the fast disassemble of the micelle and the specific release of the drug into cytoplasm. [less ▲]

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See detailDISTRIBUTION OF CAPSULAR POLYSACCHARIDES OF STREPTOCOCCUS AGALACTIAE STRAINS FROM URUGUAY. MULTIPLEX PCR VERSUS CONVENTIONAL CAPSULAR SEROTYPING
Rodriguez Cuns, Grisel ULg; BOREUX, Raphaël ULg; ADAMS, Pauline et al

in XIX Lancefield International Symposium on Streptococci and Streptococcal Diseases, Program and Abstract book (2014, November 11)

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See detailPratiques et stratégies alimentaires dans l'Antiquité tardive : l'apport de la papyrologie
Marganne, Marie-Hélène ULg

Conference (2014, November 10)

Sans équivalent dans le monde antique et tardo-antique en raison des conditions climatiques favorables de l’Égypte, les sources papyrologiques, qu'elles soient littéraires, documentaires, magiques ou ... [more ▼]

Sans équivalent dans le monde antique et tardo-antique en raison des conditions climatiques favorables de l’Égypte, les sources papyrologiques, qu'elles soient littéraires, documentaires, magiques ou chrétiennes, écrites en grec, en latin ou même en copte, fournissent de nombreuses informations sur les denrées alimentaires, non seulement produites et importées dans le Pays du Nil durant la période byzantine (à partir de l'accession au principat de Dioclétien, en 284, jusqu'à la conquête arabe, en 641), mais également exportées et consommées dans le reste de l'Empire romain et dans d’autres contrées, ainsi que sur la manière de les utiliser. Après avoir inventorié les papyrus contenant des références à des produits alimentaires, leur genre, leur provenance, leur forme, leur langue et leur écriture, à l'aide de quelques exemples, on s’interrogera sur leur contenu et sur ce qu’il révèle des pratiques et stratégies alimentaires d’une société multiculturelle (Égyptiens, Grecs, Romains, Juifs, etc.) depuis l’époque hellénistique, de l’internationalisation et de l’intensification des relations commerciales sous l’Empire romain, sans oublier l’influence des préceptes religieux. [less ▲]

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See detailWork Integration and Social Enterprises: dynamics and challenges in Europe
Rijpens, Julie ULg

Conference (2014, November 10)

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie ULg; Schyns, Michael ULg

Conference (2014, November 09)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approach is ... [more ▼]

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approach is to allow multi-trips with pickup and delivery at some intermediate locations. The objective is to minimize the economic and environmental costs including the impact of the intermediate operations. We resort to an integer linear model. Numerical experiments have been performed using a standard B\&C library. Heuristics are developed to speed up the process. [less ▲]

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See detail« Roman policier métaphysique et récit de l’échec »
Dechene, Antoine ULg

Conference (2014, November 09)

Detailed reference viewed: 6 (0 ULg)
See detailUse of lipid probes as matrices for MALDI Imaging applications
Longuespée, Rémi ULg; Alberts, Deborah ULg; Pottier, Charles et al

Poster (2014, November 07)

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See detailLes lettres des tirailleurs rwandais
Singiza, Dantès ULg

Conference (2014, November 07)

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See detailRetrievals of formaldehyde from ground-based FTIR and MAX-DOAS observations at the Jungfraujoch station and comparisons with GEOS-Chem and IMAGES model simulations
Franco, Bruno ULg; Hendrick, François; Van Roozendael, Michel et al

Conference (2014, November 07)

As a ubiquitous product of the oxidation of many Volatile Organic Compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation ... [more ▼]

As a ubiquitous product of the oxidation of many Volatile Organic Compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation pathways leading to the formation of tropospheric ozone and secondary organic aerosols. We have successfully retrieved HCHO columns from ground-based Fourier Transform Infrared (FTIR) solar spectra and UV-Visible Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) scans recorded during the July 2010 – December 2012 time period at the Jungfraujoch station (Swiss Alps, 46.5 °N, 8.0 °E, 3580 m a.s.l.). Characterization of the retrieved products has revealed different vertical sensitivity between both remote sensing techniques. Furthermore, HCHO amounts simulated by two state-of-the-art Chemical Transport Models (CTMs), GEOS-Chem and IMAGESv2, have been compared to FTIR total columns and MAX-DOAS 3.6 – 8 km partial columns, accounting for the respective vertical resolution of each ground-based instrument. Using the CTMs outputs as intermediate, FTIR and MAX-DOAS retrievals have shown consistent seasonal modulations of HCHO throughout the investigated period, characterized by summertime maximum and wintertime minimum. Such comparisons have also highlighted that FTIR and MAX-DOAS provide complementary products for HCHO above the Jungfraujoch station. [less ▲]

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See detailDevelopment of a high throughput de novo sequencing platform for peptidic toxins combining proteomics and transcriptomics
Degueldre, Michel ULg; Verdenaud, Marion; Zuniga, Sheila et al

Poster (2014, November 07)

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See detailDe la sociologie de la littérature à une sociologie par la littérature
Ledent, David ULg

Conference (2014, November 07)

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See detailForest inventory with Terrestrial LiDAR: what about Hand-Held Mobile LiDAR?
Bauwens, Sébastien ULg; Bartholomeus, Harm; Piboule, Alexandre et al

Conference (2014, November 05)

For a decade, studies of the application of static Terrestrial Laser Scanner (TLS) in plotwise forest inventories are giving more and more effective results. In spite of the improvements occurring in ... [more ▼]

For a decade, studies of the application of static Terrestrial Laser Scanner (TLS) in plotwise forest inventories are giving more and more effective results. In spite of the improvements occurring in processing scan data to extract forest attributes, the occlusion effect is still limiting the processing efficiency. A multi-scan approach is recommended to reduce this effect. However, such approach needs pre-scan preparations (setting up the plot, targets positioning), it requires data registration and it comes at a higher data collection cost. In this study we explore the potential of a Hand-held mobile LiDAR System (HMLS) as new LiDAR tool to scan forest plots. HMLS data are compared to static TLS data (single and multi-scan) in terms of data acquisition, registration time and quality of automatic DBH extraction. The low weight, small size of the instrument and no targets requirements reduce the time of pre-scan preparations to the time needed for single scan which is 6 times less than scanning a plot with 5 scans. The registration time depends of the time spent to scan the plot and it is of the same magnitude than single scan. The resulting point cloud of the HMLS is noisier than TLS point clouds. Nevertheless, error on DBH estimations is similar to scanning a plot with a TLS positioned at 5 locations. RMSE is higher than multi-scan and close to single scan for trees detected by the both LiDAR technologies. This first study exhibits the high potential of HMLS by its simple use, which needs only one operator while presenting similar results in automatic DBH extraction than static TLS. Technology and registering method improvements of this type of mobile LiDAR will reduce the noise of the point cloud, which might reduce the DBH RMSE. [less ▲]

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See detailPollution and Siltation of Rivers in the Western Highlands of Cameroon: a Consequence of Farmland Erosion by Runoff
Djoukeng, Henri Grisseur ULg; Tankou, Christopher Mubeteneh; Degré, Aurore ULg

Conference (2014, November 05)

In the western highlands agro-ecological zone of Cameroon, rivers are constantly silted and polluted with waste from cultivated plots. This study investigated on the characterization and quantification of ... [more ▼]

In the western highlands agro-ecological zone of Cameroon, rivers are constantly silted and polluted with waste from cultivated plots. This study investigated on the characterization and quantification of sediment from plots cultivated in the watershed Méloh; among these sediment we highlighted soil, plant residues, chemical packages and plastic casing used for irrigation. In a natural rocky bottom wells, we performed for a period of three years the collection, differentiation and measurement of trapped sediment in the cultivated part of river that runs through the watershed. The total cultivated area is about 7.5 ha; slopes are operated between 14% and 17%. During the years 2012 and 2013 where farmers practiced both flatbed and ridging along the steepest slope, two methods of land preparation that do not contribute positively to water conservation, we collected an average of 10.429 t.ha-1. During the 2013 crop year, with the participation of curious farmers we experimented tied ridging in a potato; this technique was adopted on 75% of plots in 2014 and we collected 3.586 t.ha-1, a decrease of 65.61% compared to the average of previous years. This study showed that traditional agricultural practices are a cause of siltation and pollution of the Méloh river, thus almost all rivers in the study area by what the topography is similar and agriculture the main activity. Tied ridging significantly reduced siltation of rivers; it is thus an effective technique to fight against water pollution in mountain agriculture. [less ▲]

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See detailComparison of Life cycle Impact Assessment methods in a case of crop in Northern France
Merchan, Angel ULg; Combelles, Agathe

Poster (2014, November 05)

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See detailComparison of Life cycle Impact Assessment methods in a case of crop in Northern France
Merchan, Angel ULg; Combelles, Agathe

in Proceeding of the 4th international conference on Life Cycle approaches (2014, November 05)

Life Cycle Assessment (LCA) applied to the agri-food sector has been rapidly developing in the last years, however initiatives like Agribalyse® have shown the lack of consensus making on the impact ... [more ▼]

Life Cycle Assessment (LCA) applied to the agri-food sector has been rapidly developing in the last years, however initiatives like Agribalyse® have shown the lack of consensus making on the impact assessment phase (choice of characterization methods). A review of the proceedings of the 8th International Conference on Life Cycle Assessment in the Agri-Food Sector (LCAFood 2012) revealed the absence of prevalence of a life cycle impact assessment (LCIA) method, where several calculation methods and variations of them are used. [less ▲]

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See detailÉmissions gazeuses en production porcine
Philippe, François-Xavier ULg

Conference (2014, November 04)

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See detailIncorporate agroecology within research : The on-going story of four young researchers
Hatt, Séverin ULg; Artru, Sidonie ULg; Boeraeve, Fanny ULg et al

in Broadening Scopes on Food, Squeezing Urban Hinterlands (2014, November 04)

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See detailDisentangling the sources of phenotypic variation in Ambrosia artemisiifolia L.: the role of seed traits
Ortmans, William ULg; Monty, Arnaud ULg; Mahy, Grégory ULg

Poster (2014, November 03)

When invading new environments, a plant invader may express new phenotypes as a result of different ecological and genetic processes. It includes phenotypic plasticity, local adaptation, environmental ... [more ▼]

When invading new environments, a plant invader may express new phenotypes as a result of different ecological and genetic processes. It includes phenotypic plasticity, local adaptation, environmental maternal effects, and genetic drift. The quantification of each of these factors is crucial in the study of biological invasions. Ambrosia artemisiifolia L. invasion success is strongly linked to seed characteristics (dispersal by human activities, long-lived soil seed bank, etc.). Known as an opportunist and a colonizer, the species is often limited by the competition from other plants. In the early stages of development, the seedlings can be quickly outcompeted and a rapid growth is therefore a major advantage. First, this study aims to analyze the seed traits variation, and to detect an impact of these traits on the early development of the seedling (environmental maternal effect). Second, we aimed to quantify the respective role of phenotypic plasticity, environmental maternal effect, local adaptation and genetic drift on seedlings phenotype. Variability of seeds from 3 geographical zones (Belgium – Centre of France – South of France) was assessed. We measured the seed variation in mass, length, width, circularity, and pigmentation. Seeds were disposed in growth chamber under two temperature treatments. After two months, we compared seedling phenotypic variation in germination time, height, aboveground biomass, belowground biomass, early competitive performance, and the final leaf area. We found a high variability of seed traits. Seeds were varying significantly among zones, populations, and parents, with more than 30% of the variation attributable to the mother plant identity. The main sources of seedling phenotypic variation appeared to be phenotypic plasticity and environmental maternal effect. No genetic differentiation was detected in this study. Seed mass was positively correlated to seedling biomass, early competitive performance, and the final leaf area. The relevance of traits reflecting environmental maternal effect is discussed. Phenotypic plasticity and seed characteristics appear to play a major role in the invasion success. [less ▲]

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See detailBiostratigraphic and chemostratigraphic constraints of the Mbuji-Mayi Supergroup (Meso-Neoproterozoic age), Democratic Republic of Congo.
Kabamba Baludikay, Blaise ULg; Bekker, Andrey; Baudet, Daniel et al

Conference (2014, November 03)

The Mbuji-Mayi Supergroup is a sedimentary sequence unaffected by regional metamorphism [1]. It was deposited between 1174 ± 22 Ma and ca. 800 Ma in the intracratonic failed-rift SMLL “Sankuru-Mbuji-Mayi ... [more ▼]

The Mbuji-Mayi Supergroup is a sedimentary sequence unaffected by regional metamorphism [1]. It was deposited between 1174 ± 22 Ma and ca. 800 Ma in the intracratonic failed-rift SMLL “Sankuru-Mbuji-Mayi- Lomami- Lovoy” basin [2] which extends from SE to NW between Katanga and Kasai Provinces. And overlies the Mesoproterozoic Kibaran Belt Supergroup (in the eastern part of SMLL basin) while in the Western part, where we focused our work, it rests unconformably upon Archean Dibaya Granitic Complex [3]. The amygdaloidal basaltic pillow lavas (948 ± 20 Ma) overlie the Mbuji-Mayi Supergroup, at the confluence of Mbuji-Mayi and Sankuru rivers [4]. Lithostratigraphically, this Supergroup consists in two distinct successions: a lower siliciclastic sequence (~500m) of BI Group and an upper carbonatic sequence (~1000m) with stromatolitic build-ups and black shales of BII Group [2]. Our own and previous sedimentological observations [5] indicate facies ranging from subtidal, low-energy stromatolitic environments to overlying intertidal to supratidal evaporitic settings of lagoon and sabkha. Here we present data on microfossil diversity and carbon isotope chemostratigraphy from the Kanshi, Lubi and Kafuku drillholes. The well-preserved and diverse assemblage of acritarchs and filamentous forms includes prokaryotes and eukaryotes, and is similar to other coeval assemblages described worldwide outside of Africa. The presence of the acanthomorph acritarch Trachyhystrichosphaera aimika is significant as it is indicative of the late Meso- to early Neoproterozoic age elsewhere, and is reported for the first time in Central Africa. So far, 56 species belonging to 31 genera were identified, dramatically increasing the previously reported diversity [6, 7]. Chemostratigraphy based on δ13Ccarb values for 290 samples, records, for the BI Group, predominantly negative values down to -8 to -9 ‰ VPDB with few samples having more positive, up to +3 ‰, values. Although the siliciclastics-rich sediments in the lower part of the BI Group likely record early diagenetic signal, carbonates in the upper part of the BI Group show similar patterns in both the Lubi and Kafuku drill cores with the sharp fall from +1 to +3 ‰ values to -8 to -7 ‰ and recovery back to +1 ‰ values over 40 to 70 m of section. The BII Group shows a less dramatic rise from -1 ‰ to +4 to +5 ‰ over more than 150 m of section. These large-scale variations differ from the steady-state carbon cycle of the late Mesoproterozoic [8] and are typical of the early Neoproterozoic record [9]. The project is supported by the EU FP7 ERC Stg ELITE. [less ▲]

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See detailHigh-Dispersion Spectroscopic Observations of Comet C/2012 S1 (ISON) with the Subaru Telescope
Shinnaka, Yoshiharu; Kawakita, Hideyo; Nagashima, Masayoshi et al

in Bulletin of the American Astronomical Society (2014, November 01), 46

Comet C/2012 S1 (ISON) was one of the Oort cloud comets and dynamically new. This comet was broken at its perihelion passage on UT 2013 November 28.1 (at Rh ~ 17 solar radius). We observed the comet C ... [more ▼]

Comet C/2012 S1 (ISON) was one of the Oort cloud comets and dynamically new. This comet was broken at its perihelion passage on UT 2013 November 28.1 (at Rh ~ 17 solar radius). We observed the comet C/2012 S1 (ISON) on UT 2013 November 15 with the High Dispersion Spectrograph (HDS) mounted on the Subaru Telescope atop Mauna Kea, Hawaii. Its heliocentric and geocentric distances were 0.601 and 0.898 AU, respectively. We selected the slit size of 0”.5 x 9”.0 on the sky to achieve the spectral resolution of R = 72,000 from 550 to 830 nm. The total exposure time of comet C/2012 S1 (ISON) was 1200 seconds. We detected many emission lines caused from radicals (e.g., CN, C2, NH2), ions (H2O+), atoms ([OI] and Na I) and also many unidentified lines in the spectra. We report the (1) the ortho-to-para abundance ratios (OPRs) of water and ammonia estimated from the high-dispersion spectra of H2O+ and NH2, (2) the green-to-red line ratio of forbidden oxygen emissions, (3) the isotopic ratios of C2 (the carbon isotopic ratio from Swan band) and CN (the carbon and nitrogen isotopic ratios from red band), (4) the sodium-to-continuum ratio of comet C/2012 S1 (ISON). </PRE></BODY></HTML> [less ▲]

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See detailThe TRAPPIST comet survey in 2014
Jehin, Emmanuel ULg; Opitom, Cyrielle ULg; Manfroid, Jean ULg et al

in Bulletin of the American Astronomical Society (2014, November 01), 46

TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that has been installed in June 2010 at the ESO La Silla Observatory [1]. Operated from Liège (Belgium) it is ... [more ▼]

TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that has been installed in June 2010 at the ESO La Silla Observatory [1]. Operated from Liège (Belgium) it is devoted to the detection and characterisation of exoplanets and to the study of comets and other small bodies in the Solar System. A set of narrowband cometary filters designed by the NASA for the Hale-Bopp Observing Campaign [2] is permanently mounted on the telescope along with classic Johnson-Cousins filters. We describe here the hardware and the goals of the project. For relatively bright comets (V < 12) we measure several times a week the gaseous production rates (using a Haser model) and the spatial distribution of several species among which OH, NH, CN, C2 and C3 as well as ions like CO+. The dust production rates (Afrho) and color of the dust aredetermined through four dust continuum bands from the UV to the red (UC, BC, GC, RC filters). We will present the dust and gas production rates of the brightest comets observed in 2014: C/2012 K1 (PANSTARRS), C/2014 E2 (Jacques), C/2013 A1 (Siding Springs) and C/2013 V5 (Oukaimeden). Each of these comets have been observed at least once a week for several weeks to several months. Light curves with respect to the heliocentric distance will be presented and discussed. [1] Jehin et al., The Messenger, 145, 2-6, 2011.[2] Farnham et al., Icarus, 147, 180-204, 2000. [less ▲]

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See detailResponse of Microchannel Plate (MCP) Detectors to MeV Electrons: Beamline tests in support of Juno, JUICE, and Europa Mission UVS instrument investigations
Retherford, Kurt D.; Davis, Michael W.; Greathouse, Thomas K. et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2014, November 01)

The response of Microchannel Plate (MCP) detectors to far-UV photons is excellent. MCPs provide a photon-counting capability that is especially useful for high-quality stellar and solar occultation ... [more ▼]

The response of Microchannel Plate (MCP) detectors to far-UV photons is excellent. MCPs provide a photon-counting capability that is especially useful for high-quality stellar and solar occultation measurements. However, use of MCPs within the Jovian magnetosphere for UV measurements is hampered by their ~30% detection efficiency to energetic electrons and ~1% efficiency to γ-rays. High-Z shielding stops energetic electrons, but creates numerous secondary particles; γ-rays are the most important of these for MCPs. These detected particles are a noise background to the measured far-UV photon signal, and at particularly intense times their combination can approach detector global count rates of ~500 kHz when operating at nominal HV levels. To address the challenges presented by the intense radiation environment experienced during Europa encounters we performed electron beam radiation testing of the Juno-UVS flight spare cross-delay line (XDL) MCP in June 2012 at MIT’s High Voltage Research Laboratory (HVRL), and again in Nov. 2013 adding an atomic-layer deposition (ALD) coated test-MCP, to measure the detection efficiency and pulse height distribution characteristics for energetic electrons and γ-rays. A key result from this UVS-dedicated SwRI IR&D project is a detailed characterization of our XDL’s response to both particles (electrons and γ-rays) and photons as a function of HV level. These results provide confidence that good science data quality is achievable when operating at Europa closest approach and/or in orbit. Comparisons with in-flight data obtained with New Horizons Pluto-Alice MeV electron response measurements at Jupiter (Steffl et al., JGR, 2012), LRO-LAMP electron and proton event data, and Juno-UVS Earth proton-belt flyby data, and recent bench tests with radioactive sources at Sensor Sciences increase this confidence. We present a description of the test setup, quantitative results, and several lessons learned to help inform future beamline test experiments dedicated to instrument developments for NASA's next large mission to Europa and ESA's JUICE mission to Ganymede. [less ▲]

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See detailSearch for Satellite Effects on Saturn's Auroras in Cassini UVIS Data
Pryor, Wayne R.; Esposito, Larry; Jouchoux, Alain et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2014, November 01)

The Cassini UVIS has been obtaining Saturn auroral images since 2004. We have previously reported instances when the main auroral oval brightened briefly in a quasi-periodic fashion near the sub-Mimas ... [more ▼]

The Cassini UVIS has been obtaining Saturn auroral images since 2004. We have previously reported instances when the main auroral oval brightened briefly in a quasi-periodic fashion near the sub-Mimas longitude. Here we examine the large set of auroral images obtained from close range and high sub-spacecraft latitudes. We will plot the brightness of the individual auroral measurements as a function of local time, and as a function of the location of Mimas and other moons to test for any correlations. [less ▲]

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See detailMagnetic fields in O stars
Nazé, Yaël ULg

in Mathys, Gauthier; Griffin, E.; Kochukhov, O. (Eds.) et al Putting A Stars into Context: Evolution, Environment, and Related Stars (2014, November 01)

During the last decade, large-scale, organized (generally dipolar) magnetic fields with strengths between 0.1 and 20 kG have been detected in dozens of OB stars. This contribution reviews the impact of ... [more ▼]

During the last decade, large-scale, organized (generally dipolar) magnetic fields with strengths between 0.1 and 20 kG have been detected in dozens of OB stars. This contribution reviews the impact of such fields on the stellar winds of O-type stars, with emphasis on variability and X-ray emission. [less ▲]

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See detailTRAPPIST monitoring of comet C/2013 A1 (Siding Spring)
Opitom, Cyrielle ULg; Jehin, Emmanuel ULg; Manfroid, Jean ULg et al

in Bulletin of the American Astronomical Society (2014, November 01), 46

C/2013 A1 (Siding Spring) is a long period comet discovered by Robert H McNaught at Siding Spring Observatory in Australia on January 3, 2013 at 7.2 au from the Sun. This comet will make a close encounter ... [more ▼]

C/2013 A1 (Siding Spring) is a long period comet discovered by Robert H McNaught at Siding Spring Observatory in Australia on January 3, 2013 at 7.2 au from the Sun. This comet will make a close encounter with Mars on October 19, 2014. At this occasion the comet will be extensively observed both from Earth and from several orbiters around Mars.On September 20, 2013 when the comet was around 5 au from the Sun, we started a monitoring with the TRAPPIST robotic telescope installed at La Silla observatory [1]. A set of narrowband cometary filters designed by the NASA for the Hale-Bopp Observing Campaign [2] is permanently mounted on the telescope along with classic Johnson-Cousins B, V, Rc, and Ic filters.We observed the comet continuously at least once a week from September 20, 2013 to April 6, 2014 with broad band filters. We then recovered the comet on May 20. At this time we could detect the gas and started the observations with narrow band filters until early November, covering the close approach to Mars and the perihelion passage.We present here our first results about comet Siding Springs. From the images in the broad band filters and in the dust continuum filters we derived A(θ)fρ values [3] and studied the evolution of the comet activity with the heliocentric distance from September 20, 2013 to early November 2014. We could also detect gas since May 20, 2014. We thus derived gas production rates using a Haser model [4]. We present the evolution of gas production rates and gas production rates ratios with the heliocentric distance.Finally, we discuss the dust and gas coma morphology. [less ▲]

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See detailJupiter’s polar auroral dynamics
Grodent, Denis ULg; Bonfond, Bertrand ULg

in AAS/Division for Planetary Sciences Meeting Abstracts (2014, November 01)

The morphology of Jupiter’s ultraviolet aurora is commonly described in terms of components located inside (poleward of) or outside (equatorward of) the main oval emission. These components may also be ... [more ▼]

The morphology of Jupiter’s ultraviolet aurora is commonly described in terms of components located inside (poleward of) or outside (equatorward of) the main oval emission. These components may also be discriminated by their temporal behaviour, where the narrowest parts of the main “oval” remain relatively stable over time periods of several hours, and the satellite footprints show large variability with timescales of minutes. Inside the main emission the so-called polar aurora, presumably corresponding to the polar cap mixing open and closed magnetic field lines, is characterized by rapid motions taking the form of swirls, giving rise to the “swirl region” and by intermittent brightenings in the “active region”. Coarse analysis of these motions suggests that they are too fast to respond to an equatorial magnetospheric forcing. Instead, they appear to be related to processes taking place in or above the ionosphere where distances travelled by plasma waves match those of the subtended auroral emission. Here, we present a preliminary improved analysis of the auroral motion in the polar region based on the application of an iterative “Advection Corrected Correlation Image Velocimetry” (ACCIV) method (Asay-Davis et al., 2009). This method allows one to build velocity fields quantifying local and overall auroral motions which may then be used to constrain their origin. [less ▲]

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See detailCost-effectiveness model for sofosbuvir in chronic hepatitis C
De Groote, K; Michielsen, P; DELWAIDE, Jean ULg

in Value in Health (2014, November)

Pan-genotypic cost-effectiveness has been demonstrated for sofosbuvir in comparison for the current standard of care in HCV in Belgium. Overall, the wheghted pan-genotypic ICER is 15.575 Euros.

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See detailGouvernance des pôles de compétitivité: des dynamiques de tercéisation multi-niveaux, gage du respect de l’intérêt collectif ?
Lisein, Olivier ULg; Rondeaux, Giseline ULg

Conference (2014, November)

Le développement et l’importance sans cesse croissants des pôles de compétitivité dans notre économie contemporaine suscitent un intérêt certain au sein du milieu académique, où les chercheurs abordent ... [more ▼]

Le développement et l’importance sans cesse croissants des pôles de compétitivité dans notre économie contemporaine suscitent un intérêt certain au sein du milieu académique, où les chercheurs abordent les enjeux que représente cette nouvelle forme de regroupement territorialisé d’organisations sous des angles d’analyse divers. En particulier, la gouvernance de ce type de réseaux d’innovation réunissant des catégories d’acteurs hétérogènes, les formes qu’elle est concrètement susceptible de prendre dans les faits, les dynamiques qu’elle engendre en termes de synergies collaboratives et de performances des partenariats constituent des champs de recherche en pleine émergence, renforcés par la pression des pouvoirs publics qui attendent des pôles de compétitivité qu’ils gèrent au mieux les ressources financières qui leur sont octroyées et veillent à rentabiliser celles-ci dans l’intérêt de la collectivité. C’est dans ce cadre que s’inscrit notre contribution, laquelle entend plus particulièrement interroger plus en avant cette question de la gouvernance des pôles de compétitivité et tenter de cerner de façon plus précise les pratiques managériales à l’œuvre dans ce type de structure collaborative. En dépassant le stade d’une gouvernance du réseau et d’un management des activités placés sous la seule responsabilité des "porteurs de projets", nous nous intéressons aux efforts que consentent les parties prenantes – internes et externes – des pôles de compétitivité pour arriver à la satisfaction conjointe de leurs intérêts respectifs. En ce sens, nous questionnons l’éventuel "déplacement identitaire" et les "concessions partenariales" potentielles que seraient amenés à opérer certains acteurs – partenaires actifs au sein des réseaux d’innovation et/ou institutions extérieures moins directement impliquées dans la vie de ces réseaux collaboratifs – pour favoriser le succès des pôles de compétitivité et des projets qui y sont développés. Renvoyant à l’idée de "dynamique de tercéisation", qui illustre le processus de réflexivité qu’opèrent les acteurs pour concevoir et institutionnaliser de nouvelles pratiques collaboratives, ces enjeux sont étudiés au cours de notre propos à la lumière des enseignements tirés d’une recherche empirique menée au sein des pôles de compétitivité promus en Belgique dans le cadre du Plan Marshall, initiative mise en œuvre par le Gouvernement de la Région Wallonie-Bruxelles pour renforcer les processus d’innovation des entreprises et soutenir le développement économique de la Région. Les résultats en la matière sont contrastés : confrontés aux logiques d’actions différentes de partenaires issus d’autres "mondes", certains acteurs des pôles de compétitivité tendent effectivement à réaliser des "concessions identitaires" en vue d’arriver à la satisfaction conjointe des intérêts respectifs en présence ; d’autres acteurs au contraire restent davantage en retrait en termes de "dynamique de tercéisation", n’entrant que partiellement dans un processus de réflexivité par rapport à leurs pratiques usuelles. Cette dualisation de comportements n’est pas sans répercussion potentielle sur l’atteinte des objectifs d’innovation et de respect de l’intérêt collectif inhérents aux pôles de compétitivité. [less ▲]

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See detailBash Tapa (Iraq). The Pottery from the First Excavation Campaign
Mas, Juliette ULg

Conference (2014, November)

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). When ... [more ▼]

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). When the sounding carried out on the top of the site allowed us to explore middle-assyrian levels, the stratigraphical step trench excavated on the southern slope of the tell revealed six phases of occupation dating to the 3rd millennium BC, from the Ninevite 5 to the Early Dynastic III periods. A first evaluation of the pottery material recovered in this operation revealed that there are different traditions represented at the site. In fact, while the material dated from the beginning of the Early Bronze Age is clearly related to the Northern tradition, the most recent 3rd millennium levels identified so far have provided us with pottery which could be connected to Central Mesopotamia, and more specifically to the Diyala region. This paper will give a first overview of the pottery from the first campaign of excavation at Bash Tapa, mainly focusing on 3rd millennium material, its links with the other regions of Near East and its significance for chronology. [less ▲]

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See detailThe effect of sampling effort on mammalian paleodiversity: the fossil record of large and small mammals compared
Santaella, Beatriz; Figueirido, Borja; Cascales - Miñana, Borja ULg et al

in Journal of Vertebrate Paleontology, Program and Abstracts, 2014 (2014, November)

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See detailEtude de la forme d'arcade dentaire après nivellement en technique Damon.
LEWY, Stéphanie; LIMME, Michel ULg; BRUWIER, Annick ULg

Poster (2014, November)

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See detailMagnetospheric modes and magnetic reconnection.
Hubert, Benoît ULg; Milan, S.E.; Cowley, S.W.H.

Poster (2014, November)

We combine imaging of the proton aurora from the SI12-IMAGE instrument with measurement of the ionospheric convection from the SuperDARN radar network to analyze the cycle of magnetic flux opening and ... [more ▼]

We combine imaging of the proton aurora from the SI12-IMAGE instrument with measurement of the ionospheric convection from the SuperDARN radar network to analyze the cycle of magnetic flux opening and closure of the Earth magnetosphere. Interaction between the solar wind and the Earth geomagnetic environment causes a reconfiguration of the magnetic field that connects the interplanetary magnetic field (IMF) to the geomagnetic field. This reconnection process produces open magnetic field lines (i.e. field lines of the magnetosphere that close through the interplanetary medium) that are dragged to the magnetotail by the solar wind flow, where they eventually reconnect again, back to a closed topology. The SI12 imaging of the Doppler-shifted Lyman-α emission of the proton aurora is used to estimate the location of the boundary separating open and closed field lines at ionospheric altitude. We then estimate the open magnetic flux of the Earth magnetosphere, encircled by this boundary. The rate of reconnection causing a variation of the open magnetic flux can be expressed as a voltage in application of Faraday’s law. This voltage is measured along the open/closed field line boundary determined from the imaging data. The electric field associated with the voltage has two origins: motion of the boundary and the ionospheric field. We use the ionospheric electric field deduced from ionospheric convection measurement from the SuperDARN to estimate the reconnection voltage at the magnetopause (flux opening) and in the magnetotail (flux closure) accounting for the motion of the open/closed field line boundary determined from the SI12 images. The method is applied during substorms, steady geomagnetic convection intervals, sawtooth events and geomagnetic storms. These different intervals are characterized by different values of open flux and reconnection rates, as a result of different coupling between the solar wind and the geomagnetic environment. We interpret these differences as different dynamic modes of the magnetospheric system. Shock-induced flux closure events are also presented, as an exceptional situation that differs from the modes presented above. [less ▲]

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See detailEcomorfologia y evolucion del sistema locomotor de la familia Pomacentridae
Aguilar-Medrano, Rosalia; Frederich, Bruno ULg; Barber, Paul

Conference (2014, November)

Due their productivity, structural diversity, and potential to promote ecological, functional and morphological evolution, coral reefs have the highest species richness of fishes. As swimming is the ... [more ▼]

Due their productivity, structural diversity, and potential to promote ecological, functional and morphological evolution, coral reefs have the highest species richness of fishes. As swimming is the primary form of locomotion and interaction their aquatic environment, small morphological variations can have profound implications on the fitness of fishes. The damselfish family, Pomacentridae, has inhabited coral reef ecosystems for more than 50 million years. As such, habitat preferences and behavior could significantly contribute to the evolution of the morphology of damselfish through the impacts of shape on locomotion. To test this hypothesis, we employed comparative morphometric analyses of fish shape and ecology. While body elongation represented the primary source of variation in locomotor system shape, results also showed a diverse suit of morphological combinations in between the morphological extremes. Results showed strong associations between behavior and habitat preferences, suggesting that behavior may constrain the shape of the locomotor system in damselfishes. Position in the water column show relation with the cephalic region and truck, behavior is related to the cephalic angle and the angle of insertion of the pectoral fin, while maximum depth is related to the caudal peduncle. Was found little relation between the caudal peduncle, the angle of pectoral fin attachment and the rest modules, therefore, this two modules may be the main responsible of swimming fitness in damselfishes. Finally, cephalic region is highly related to most modules, especially to trunk. This strong integration may be responsible of the limit morphological variation of damselfishes. [less ▲]

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See detailConnexion universelle et enveloppement du futur dans le présent
Bouquiaux, Laurence ULg

Conference (2014, November)

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See detailL’introduction des nouvelles technologies dans les services d’aide aux personnes : Une question de justifications
Franssen, Marine ULg; Pichault, François ULg; Naedenoen, Frédéric ULg

Conference (2014, November)

Prenant appui sur la théorie des conventions, l’article analyse les résultats d’une recherche-intervention menée auprès de deux organisations de services d’aide aux personnes lors de l’introduction d’un ... [more ▼]

Prenant appui sur la théorie des conventions, l’article analyse les résultats d’une recherche-intervention menée auprès de deux organisations de services d’aide aux personnes lors de l’introduction d’un procédé de gestion informatisé des données. Il se centre sur les attitudes des collaborateurs et les justifications invoquées par les dirigeants de ces deux organismes. Le procédé informatisé présente de nombreuses caractéristiques du monde industriel, au sens défini par Boltanski et Thévenot [1991]. Comprenant potentiellement une importante dimension de contrôle via la géolocalisation, les risques de rejet paraissent élevés au sein d’un secteur où la mission sociale constitue le fondement des actions. Les résultats indiquent que les compromis nouvellement créés lors de la dématérialisation du formulaire papier restent précaires, dépendant fortement de la volonté des dirigeants en place. Nous préconisons dès lors l’établissement d’un suivi régulier des modalités d’application de ce système informatique afin d’en consolider les bases. [less ▲]

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See detailPropuesta de estrategia para la producción de biocombustibles de biomasa lignocelulósica
Ramos-Sanchez, L.B.; Cujilema-Quitio, M.C.; Leon-Revelo, G. et al

Conference (2014, November)

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See detailBacillus as a source of novel antibiotics
Fickers, Patrick ULg

Conference (2014, November)

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See detailHighly sophisticated compound droplets on fiber arrays
Weyer, Floriane ULg; Lismont, Marjorie ULg; Dreesen, Laurent ULg et al

Poster (2014, November)

The poster shows a drop of oil containing four soapy water droplets of four different colors : red, orange, green and blue. This sophisticated object is created thanks to a fiber array. Fiber networks ... [more ▼]

The poster shows a drop of oil containing four soapy water droplets of four different colors : red, orange, green and blue. This sophisticated object is created thanks to a fiber array. Fiber networks allow processes such as droplet motion, fragmentation, trapping, releasing, mixing and encapsulation. Therefore, by using a vertical fiber decorated with successive nodes, compound droplets can be created. A soapy water droplet, with a specific color, is placed at each intersection. Then, a silicon oil droplet glides along the vertical fiber, encapsulates and collects the water droplets at each node leading to the formation of a compound droplet with four different components. [less ▲]

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See detailReference values for the craniocervical flexion test in healthy volunteers
Demoulin, Christophe ULg; Hody, Stéphanie ULg; GROSDENT, Stéphanie ULg et al

in Abstract Book of 7th Biennial Congress of The Belgian Back Society (2014, November)

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See detailTh17 cells in melanoma microenvironment
Weatherspoon, Alodie ULg; Multon, Sylvie ULg; Defaweux, Valérie ULg et al

Poster (2014, November)

Detailed reference viewed: 27 (8 ULg)
See detailSpace Weather at Saturn - Auroral observations
Radioti, Aikaterini ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2014, November)

Unlike to Earth, Saturn is a fast rotator and its magnetosphere is dominated by fast planetary rotation and internally driven processes. However, the interaction of the solar wind with Saturn’s ... [more ▼]

Unlike to Earth, Saturn is a fast rotator and its magnetosphere is dominated by fast planetary rotation and internally driven processes. However, the interaction of the solar wind with Saturn’s magnetosphere is not negligible and it is manifested among others in the auroral region. The interplanetary magnetic field reconnects with the dayside magnetopause at Saturn and results in enhancements in the auroral emission accompanied by entry of significant amount of open flux in the magnetosphere. The solar wind affects also the nightside magnetosphere. Dramatic enhancements of the nightside-dawn auroral emissions have been attributed to solar wind-induced auroral storms. Additionally, recent auroral observations revealed the presence of a transpolar arc at Saturn, one of the most spectacular auroral features at Earth, which could be possibly related to solar wind driven tail reconnection. Finally, there is evidence of viscous interaction of the solar wind with Saturn’s magnetosphere, which involves magnetic reconnection on a small scale. [less ▲]

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See detailSocio-economic characteristics of Fulani's households in Northeastern Benin
Chabi Toko, Roukayath ULg; Adegbidi, Anselme; Lebailly, Philippe ULg

in Kovacevic, Dusan (Ed.) Book of proceeding Fourth International Scientific Agricultural Symposium "Agrosym 2014" (2014, November)

Fulani belong to a socio-cultural group predominantly met in western Africa and usually raises cattle. Known as a nomadic group, Fulani have become increasingly more settled and combine crop farming with ... [more ▼]

Fulani belong to a socio-cultural group predominantly met in western Africa and usually raises cattle. Known as a nomadic group, Fulani have become increasingly more settled and combine crop farming with livestock husbandry. In Benin Fulani are predominant in the two eastern departments of the north. This community plays a key role in meat and milk supply in the country. But deep information on their household characteristics is scarce so that specific development actions concerning their activities are scarce. This study was carried out to characterize their household and highlight their livelihood strategies in the three agroecological conditions of the study area. 150 Fulani livestock keepers randomly selected were interviewed in 2013. The results show that the average household size is 18 people of which 22% are directly involved in cattle farming. The land is mostly inherited and the average size for a household is about 10.5 ha. Half of the land size is devoted to crops farming mainly 80% for home consumption and 17% to cotton production. Their livestock includes cattle, sheep, goats and poultry (chickens and Guinea fowl). Cattle represent 50% of the household livestock size. Cattle provide daily milk consumed at 51%; the rest is sold. Fulani also sell in average one cattle per month. In less favorable ecological conditions, they derive their income mainly from livestock. While in the regions where it rains more, they diversify their incomes by investing in food crops and cash crop (cotton mainly) farming. [less ▲]

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See detailImpact de la phéromone d’alarme sur l’efficacité de la transmission de virus
Bosquée, Emilie ULg; Lin, Fang Jing; Liu, Ying Jie et al

Poster (2014, November)

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See detailDistribution and robustness of a distance-based multivariate coefficient of variation
Aerts, Stéphanie ULg

Poster (2014, November)

When one wants to compare the homogeneity of a characteristic in several popula- tions that have di erent means, the advocated statistic is the univariate coe cient of variation. However, in the ... [more ▼]

When one wants to compare the homogeneity of a characteristic in several popula- tions that have di erent means, the advocated statistic is the univariate coe cient of variation. However, in the multivariate setting, comparing marginal coe cients may be inconclusive. Therefore, several extensions that summarize multivariate relative dispersion in one single in- dex have been proposed in the literature (see Albert & Zhang, 2010, for a review). In this poster, focus is on a particular extension, due to Voinov & Nikulin (1996), based on the Mahalanobis distance between the mean and the origin of the design space. Some arguments are outlined for justifying this choice. Then, properties of its sample version under elliptical symmetry are discussed. Under normality, this estimator is shown to be biased at nite samples. In order to overcome this drawback, two bias corrections are proposed. Moreover, the empirical estimator also su ers from a lack of robustness, which is illustrated by means of in uence functions. A robust counterpart based on the Minimum Covariance Determinant estimator is advocated. [less ▲]

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See detailLa sociologie implicite de la littérature
Ledent, David ULg

in Narrative Knowing / Récit et savoir (2014, November)

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See detailRegional crop modelling and yield forecasting: opportunities in coupling models and satellite data
Wellens, Joost ULg; Derouane, Johan

Conference (2014, November)

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See detailTreg/Th17 balance during murine embryo implantation and pregnancy
Polese, Barbara ULg; Gridelet, Virginie ULg; Araklioti, Eleni et al

Poster (2014, November)

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See detailPhotoelectric Conversion Effect in Non-Photovoltaic Photorefractive Materials
Frejlich, Jaime; De Oliveira, Ivan; Carvalho, Jesiel et al

in Latin America Optics & Photonics Conference (LAOP) - OSA Technical Digest (online) (2014, November)

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See detailANÁLISE DE REQUISITOS PARA AVALIAÇÃO DE QUALIDADE GEOMÉTRICA NO REGISTRO DO PATRIMÔNIO ARQUITETÔNICO COM TÉCNICAS FOTOGRAMÉTRICAS
Campos, Mariana Batista; De Moraes, Marcus Antunes; Tommaselli, Antonio Maria Garcia et al

in Nome, Carlos Alejandro; de Magalhães Cordeiro, Aristóteles Lobo; Rocha, Germana Costa (Eds.) Anais ARQDOC 2014 INFORMAÇÃO E CONHECIMENTO PARA PRESERVAÇÃO (2014, November)

The documentation of the cultural heritage is a concern since 1885, with the first application of photogrammetry techniques by Albrecht Meydenbauer. In 1987, The International Council of Monuments and ... [more ▼]

The documentation of the cultural heritage is a concern since 1885, with the first application of photogrammetry techniques by Albrecht Meydenbauer. In 1987, The International Council of Monuments and sites has recommended the creation of photogrammetry records of monuments and archaeological sites. Since then, the close range photogrammetry has been the most used technique to survey cultural heritage. This technique has become faster and more accessible with the advancement of digital cameras. Despite the recommendations of International Council of Monuments and sites, the advent of new technologies and the importance of a quality evaluation and documentation, there are few studies with a rigorous analysis of the requirements for the cultural heritage documentation, with focus on the geometry of the models generated by digital photogrammetry process. The aim of this work is to propose discussions and analysis of requirements for the evaluation of planimetric quality of photogrammetric projects applied to the cultural heritage documentation. [less ▲]

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See detailIon mobility-mass spectrometry to perform structural classifications of disulfide-bridged-peptides
Massonnet, Philippe ULg; Upert, Gregory; Morsa, Denis ULg et al

Poster (2014, November)

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See detailMicrowave-assisted extraction of pectin from unused pumpkin biomass
Košťálová, Zuzana; Aguedo, Mario ULg; Hromádková, Zdenka

Poster (2014, November)

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See detailStabilité oxydative des viandes blanc bleu belge conditionnées sous atmosphère riche en oxygène après maturation sous vide ou en carcasse
Didimo Imazaki, Pedro Henrique ULg; Douny, Caroline ULg; Scippo, Marie-Louise ULg et al

in Viandes et Produits Carnés (2014, November)

The aim of this study was to evaluate the physico-chemical stability of Belgian Blue beef packaged under high-oxygen atmosphere as a function of a previous aging technique (wet-aging in vacuum conditions ... [more ▼]

The aim of this study was to evaluate the physico-chemical stability of Belgian Blue beef packaged under high-oxygen atmosphere as a function of a previous aging technique (wet-aging in vacuum conditions vs. carcass-aging). Two muscles (longissimus dorsi vs. rectus femoris) were studied. After a seven-day wet- or carcass-aging step, muscle cuts from 4 Belgian Blue cows were vacuum packaged and stored at −1 °C for up to 28 days. Each 14 days, part of these samples was repackaged under modified atmosphere (70 % O2:30 % CO2), and stored during 7 days at +4 °C. The following parameters were evaluated: color, metmyoglobin %, metmyoglobin reducing activity, fat content, fatty acid profile, lipid oxidation, antioxidant enzyme activities and alpha-tocopherol content. The sensitivity of modified atmosphere repacked meat cuts to oxidation was influenced by the conditions of the previous aging period (wet > carcass conditions), muscle (rectus femoris > longissimus dorsi) and length of the vacuum storage. [less ▲]

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See detailEvalulating the additional value of the illness perceptions questionnaire in patients with chronic low back pain
Leysen, M; Nijs, J; Van Wilgen, CP et al

in Abstract Book of 7th Biennial Congress of The Belgian Back Society (2014, November)

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See detailRécit de vie d’une sainte en devenir dans le sillage des Pères de la Foi : le portrait de Julie Billiart, fondatrice des Sœurs de Notre-Dame, par sa compagne, Françoise Blin de Bourdon
Henneau, Marie-Elisabeth ULg

in Mostaccio, Silvia; Caffiero, Marina; de Maeyer, Jan (Eds.) et al Échelles de pouvoir, rapports de genre, Femmes, jésuites et modèle ignatien dans le long XIXe siècle (2014, November)

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See detailRobust detection of local outliers in multivariate spatial data
Ernst, Marie ULg

Poster (2014, November)

Multivariate spatial data are geographical locations on which non spatial variables are measured. Such data may contain two types of outliers: global and/or local. Focus is here on local outlier whose ... [more ▼]

Multivariate spatial data are geographical locations on which non spatial variables are measured. Such data may contain two types of outliers: global and/or local. Focus is here on local outlier whose attribute values lie far from the values taken by its neighbors. This poster has three main objectives. The first is to review some local detection techniques that seem to perform well in practice. Secondly, an adaptation to one of these is suggested to further develop its local characteristic. Then simulations based on Matérn model are reported and discussed in order to compare in an objective way the different detection techniques. [less ▲]

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See detailAnalysing spatiotemporal changes in sediment contamination
Richir, Jonathan ULg; Pini, Jennifer; White, Shannon et al

Poster (2014, November)

Coastal environments are subjected to anthropogenic threats, of which pollution by trace elements (TEs). They remain chemicals of concern because of their toxicity, their ability to be concentrated in ... [more ▼]

Coastal environments are subjected to anthropogenic threats, of which pollution by trace elements (TEs). They remain chemicals of concern because of their toxicity, their ability to be concentrated in biota and their persistence in sediment. Aware of these threats, monitoring agencies perform large environmental surveys. However, the databases generated often remain underexploited, even though they represent an important source of information for scientists. As a case study, we focused on the highly industrialized and developed coastal area of the Solent, south coast of the UK, which is also a European Marine site with protected habitats and species. To date, no scientific-based spatiotemporal trend has been published regarding its pollution in TEs. But mining of existing databases requested from the Environmental Agency and the Marine Environment Monitoring and Assessment National database showed that sediment from 32 sites were/are indeed monitored for that purpose, covering a 22 years period (1992-2013). Temporal trend analysis showed that sediment contamination significantly decreased during that time interval (45 % decrease in median). However, all TEs still show concentrations above Sediment Quality Guidelines. Important spatial variability is also present, presumably linked to the distribution of pollutant anthropogenic sources. Taken together, these data have been used to provide stakeholders with relevant scientific based tools, i.e. GIS maps of the contamination in TEs in the Solent. This regional-level assessment enables local stakeholders to create bridges between environmental scientists and local authorities and valorizes the existing databases, for future governance at the regional and national scales. [less ▲]

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See detailEarly detection of university students in potential difficulty : a case study
Hoffait, Anne-Sophie ULg; Schyns, Michael ULg

Conference (2014, November)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by ... [more ▼]

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by early identifying students who have a high probability to face difficulties if nothing is done, the Universities might develop adapted methods to attack the problem with more emphasis where it is more needed and when it is still possible. Thus we want to develop a decision tool able to identify these students to help them. For that, we consider three standard datamining methods: logistic regression, artificial neural networks and decision trees and focus on early detection, i.e. before starting at the University. Then, we suggest to adapt these three methods as well as the classification framework in order to increase the probability of correct identification of the students. In our approach, we do not restrict the classification to two extreme classes, e.g. failure or success, but we create subcategories for different levels of confidence: high risk of failure, risk of failure, expected success or high probability of success. The algorithms are modified accordingly and to give more weight to the class that really matters. Note that this approach remains valid for any other classification problems for which the focus is on some extreme classes; e.g. fraud detection, credit default... Finally, simulations are conducted to measure the performances of the three methods, with and without the suggested adaptation. We check if the factors of success/failure we can identify are similar to those reported in the literature. We also make a ``what-if sensitivity analysis''. The goal is to measure in more depth the impact of some factors and the impact of some solutions, e.g., a complementary training or a reorientation. [less ▲]

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See detailSystematic Analysis of two cystatin C assays using samples of 2057 older adults - The Berlin initiative study
Ebert, natalie; DELANAYE, Pierre ULg; Martus, Peter et al

Poster (2014, November)

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See detailAmmonia oxidizing bacteria community structure and richness under coniferous/deciduous tree species at three temperate forest sites
Malchair, Sandrine ULg

Poster (2014, November)

Ammonia Oxidizing Bacteria community structure and richness under coniferous/deciduous tree species at three temperate forest sites Malchair S. and Carnol M. Laboratory of Plant and Microbial Ecology ... [more ▼]

Ammonia Oxidizing Bacteria community structure and richness under coniferous/deciduous tree species at three temperate forest sites Malchair S. and Carnol M. Laboratory of Plant and Microbial Ecology Department Biology, Ecology and Evolution University of Liege, Belgium Introduction: Despite the crucial roles of soil microorganisms in ecosystem processes, numerous uncertainties subsist on the relationship between soil microbial diversity and function. Furthermore, the link between aboveground and belowground diversity remains also unclear. In European forests, at the beginning of the 19th century, plantations of Norway spruce and Scots pine for timber production were substantially increased. However, concerns were expressed with regard to the ecological risks posed by coniferous monocultures. The conversion of these monocultures into broadleaved or mixed stands has been suggested as a solution. Nevertheless, belowground effects of such a change in the dominant tree species is largely unknown, although bacteria regulate many soil processes and some groups, like ammonia oxidizing bacteria (AOB) are highly sensitive to environmental stresses. Objectives: The aims of this study were to investigate (i) AOB community structure and richness under several tree species, (ii) microbial/environmental factors influencing AOB diversity, (iii) the relationship between AOB diversity and the nitrification process. Materials and methods: Forest floor (Of, Oh) was sampled under Norway spruce, Douglas fir, European beech and sessile oak at three temperate forest sites. AOB diversity (community structure and richness) was assessed by PCR-DGGE and sequencing. Samples were analysed for microbial (net N mineralization, potential nitrification, basal respiration, microbial biomass, microbial or metabolic quotient) and environmental parameters (pH, total nitrogen, extractable ammonium, organic matter content and exchangeable cations). Results: AOB sequences retrieved in this study were related to different uncultured strains from soils, related to both Nitrosospira-like and Nitrosomonas-like sequences. AOB community structure and tree species effects on AOB diversity were site-specific. AOB community structure was influenced by environmental/microbial parameters, i.e. net N mineralization or organic matter content, regulating ammonium availability. AOB richness was not related to nitrification but a very weak correlation between potential nitrification and AOB community structure was observed. Conclusions: At larger spatial scales, site specific characteristics may be more important that tree species in determining AOB richness and community structure. However, within sites, tree species influence AOB diversity. The absence of a clear relationship between AOB diversity and nitrification points to a possibly role of AOB abundance, phenotypic plasticity or the implication of ammonia oxidizing archaea in this process. [less ▲]

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See detailTMS can selectively activate and condition two different sets of excitatory synaptic inputs to corticospinal neurons in humans
Sommer, Martin; D'Ostilio, Kevin ULg; Cioccia, Matteo et al

Poster (2014, November)

Background: Current protocols or repetitive transcranial magnetic stimulation (rTMS) induce mixed facilitatory and inhibitory effects. More selective, quasi-monophasic high-frequency stimulators now ... [more ▼]

Background: Current protocols or repetitive transcranial magnetic stimulation (rTMS) induce mixed facilitatory and inhibitory effects. More selective, quasi-monophasic high-frequency stimulators now become available. We sought to investigate the impact of current direction and pulse width on intermittent theta burst stimulation (iTBS) effects on human motor cortex excitability. Also, we estimated strength-duration time constants from motor threshold and input-output (IO) curves for PA and AP orientations. Methods: We stimulated the dominant hand representation of the motor cortex in 15 healthy subjects, using “unidirectional biphasic” pulses generated by a controllable TMS machine (cTMS-3, Rogue Resolutions Ltd., Cardiff, UK), connected to a standard figure-8 coil. iTBS was applied conventionally, using 20 sequences of 2 seconds iTBS (10 bursts at 5 Hz burst repetition frequency, each burst consisting of 3 pulses of 80 % AMT intensity repeated at 50 Hz frequency). In separate sessions pulses differing in current direction and shape were applied: a) posterio-anterior (PA) current direction in the brain, 75 μs (iTBS_PA75). b) AP current direction, 45 μs (iTBS_AP45). Before and for 30 minutes after iTBS, we monitored the modulation of motor evoked potential (MEP) amplitude from the dominant first dorsal interosseus using conventional, monophasic, suprathreshold pulses generated by a Magstim 2002 stimulator, inducing PA currents in the brain, at 0.2 Hz frequency. In an additional study on ten healthy subjects, we investigated the effect the two coil orientations with three different pulse widths (30, 60 and 120 μs) on the IO curve and the latency of the motor evoked potentials (MEPs). Results: iTBS_AP45 yielded a pronounced and slightly delayed inhibition of MEP amplitude in all but one subjects, it was unrelated to the MEP latency differences. iTBS_PA75 had a variable and inconsistent effect that was in part related to the latency differenceAP-LM , in that long latency differences were correlated with the induction of inhibition rather than facilitation. We found a longer time constant for AP than PA orientation. MEP latencies yielded an interaction between pulse width and orientation, due mainly to longer onset latencies following AP stimuli of short duration. Conclusions: Current direction influences the outcome of iTBS, with a preference for AP currents. PA and AP stimuli activate the axons of neurones with different time constants. Those activated by AP pulses excite corticospinal outputs with a longer latency than those activated by PA pulses. AP pulses of short duration recruit long latency inputs most selectively. [less ▲]

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See detailLes stratégies industrielles de valorisation de la biomasse végétale en Région Wallonne
Richel, Aurore ULg

Conference (2014, November)

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les ... [more ▼]

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les matières premières disponibles pour le bioraffinage de 1ère et 2ème générations sont listées sur base des données accumulées par les équipes de Gembloux Agro-Bio Tech. Les avantages et limitations de ces matières premières sont décrits. Les technologies de conversion commercialisables sont proposées en fonction des contraintes socio-économiques de la Wallonie: bioraffineries autonomes, intégrées, etc. Divers exemples de réalisations commerciales ou en prototypes sont proposés, de même que certains projets de R&D dans ce domaine. [less ▲]

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See detail« La médiation, une justice de seconde zone ? Les modes alternatifs de résolution des conflits, le droit et l’héritage à Cotonou »
Andreetta, Sophie ULg

Conference (2014, November)

Dans la plupart des familles de Cotonou, l’héritage est source de conflits. Qu’il s’agisse de frères et sœurs et de la gestion du patrimoine commun, d’un administrateur qui accapare l’ensemble des ... [more ▼]

Dans la plupart des familles de Cotonou, l’héritage est source de conflits. Qu’il s’agisse de frères et sœurs et de la gestion du patrimoine commun, d’un administrateur qui accapare l’ensemble des ressources, d’une veuve chassée par les enfants de ses coépouses, chaque famille fait l’objet d’une anecdote, de tensions latentes ou de conflits ouverts. Si certains n’hésitent pas à saisir les tribunaux, la justice constitue la plupart du temps le dernier recours. En cas de désaccord, quelles sont les démarches entreprises avant le tribunal? Il existe une série d’instances de médiation en matière familiale, depuis les sages de la famille ou du village, jusqu’aux tribunaux de conciliation ou aux ONG d’assistance juridique. Comment les héritiers choisissent-ils le forum auquel s’adresser ? Je m’intéresserai également au fonctionnement de ces institutions parajudiciaires, à la manière dont le droit y est mobilisé, dont les conflits y sont résolus ou renvoyés vers les tribunaux. [less ▲]

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See detailGBS and antibiotic resistance: threat to therapy
MELIN, Pierrette ULg

in XIX Lancefield International Symposium on Streptococci and Streptococcal Diseases, Program and Abstract book (2014, November)

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See detailGBS and antibiotic resistance: threat to therapy
MELIN, Pierrette ULg

in XIX Lancefield International Symposium on Streptococci and Streptococcal Diseases, Program and Abstract book (2014, November)

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See detailImpact of the dialysis membrane on the Vitamin D metabolims markers
CAVALIER, Etienne ULg; DUBOIS, Bernard ULg; Urena, Pablo et al

Poster (2014, November)

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See detailStress and singing accuracy: What is the relationship?
Larrouy, Pauline ULg

Conference (2014, October 31)

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will ... [more ▼]

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will have an influence on vocal accuracy. In addition, the quality of a musical performance can be lessened or enhanced if the performer experiences stressful conditions. In order to clarify the effects of stress on singing accuracy and to explore solutions to favor the positive consequences of stress, we ran an experiment in collaboration with the Royal Conservatory of Liège. Thirty-one music students were asked to learn a simple melody. There were then recorded in a stressful condition (i.e., a music examination) and a non-stressful condition. Two groups were defined according to the challenge level of the music examination (first and second music levels). Measurements were made by self-reported state anxiety (CSAI-2R questionnaire) and by observing heart rate activity (electrocardiogram) during each performance. In addition, the vocal accuracy of the sung performances (in terms of respect of melodic contour, precision of intervals and respect of the tonality) was objectively analyzed. As expected, state anxiety and heart rate were significantly higher on the day of the music examination than in the non-stressful condition for all the music students. However, the effect of stress was positive for the first-year students but negative for the second-year students, for whom the music examination was particularly challenging. In addition, highly significant correlations were found between the intensity of cognitive symptoms and the vocal accuracy criteria. This study highlights the contrasting effects of stress on singing voice accuracy. The results encourage searchers to take into account the stress level of the performer when evaluating singing accuracy. In addition, it seems pertinent to work on the perception of somatic and cognitive symptoms in higher music institutions and to try to diminish the stress level of students, in order to favor the positive consequences of stress on the quality of musical performances. Thanks to this method, we are actually focusing on studies designed to better understand the effects of stress on speaking voice. [less ▲]

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See detailInjections de PRP et tendinopathies
Kaux, Jean-François ULg

Conference (2014, October 30)

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See detailComputergestützte Förderung der mündlichen Leistung im Fremdsprachenunterricht - Die @lter Fremdsprachkurse an der Universität Lüttich (ULg), Belgien
Thonard, Audrey ULg; Jérôme, Françoise ULg; Badir, Yasmine ULg et al

Poster (2014, October 30)

The poster présents the implementation of voice tools in the service of foreign language learning at the University of Liège. Oral skills (comprehension and production) are trained online in autonomy and ... [more ▼]

The poster présents the implementation of voice tools in the service of foreign language learning at the University of Liège. Oral skills (comprehension and production) are trained online in autonomy and with instructors' interventions. The setting also provides facilities for oral feedbacks. [less ▲]

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