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See detailOn the Use of Principal Component Analysis for Parameter Identification and Damage Detection in Structures
Golinval, Jean-Claude ULg

Conference (2014, November 20)

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this ... [more ▼]

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this presentation, a different approach based on principal component analysis is considered. Principal component analysis (PCA), also called proper orthogonal decomposition (POD), is a multi-variate statistical method that aims at obtaining a compact representation of the data. In the present paper, PCA (POD) is used for three purposes, namely damage detection, structural health monitoring and identification of nonlinear parameters. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. To this purpose, an orthogonal transformation to the basis of the eigenvectors of the sample covariance matrix is performed, and the data are projected onto the subspace spanned by the eigenvectors corresponding to the largest eigenvalues. This transformation has the property to decorrelate the signal components and to maximize variance. The first problem to which PCA is applied here is the damage detection problem. When applied to vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The second problem concerns structural health monitoring of civil engineering structures when environmental effects (e.g. the influence of the variation of the ambient temperature) have to be removed from the structural changes. In this case, PCA may be applied on identified modal features (e.g. the natural frequencies) to separate the changes due to environmental variations from the changes due to damage sources. This procedure is illustrated on the example of a real bridge located in Luxembourg. The third problem is related to the estimation of nonlinear parameters using model updating techniques. In this case, the most interesting property of PCA is that it minimizes the average squared distance between the original signal and its reduced linear representation. When applied to nonlinear problems, PCA gives the optimal approximating linear manifold in the configuration space represented by the data. The linear nature of the method is appealing because the theory of linear operators is still available. However, it should be borne in mind that it also exhibits its major limitation when the data lie on a nonlinear manifold. [less ▲]

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See detailSpatial Analysis of GNSS Measurements from an Equatorial Ionospheric Scintillation Monitoring Receiver (ISMR) Network
Lonchay, Matthieu ULg; Wautelet, Gilles ULg; Cornet, Yves ULg et al

Conference (2014, November 19)

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and ... [more ▼]

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and diffraction effects. In particular, small-scale ionospheric irregularities generated by different physical processes may cause scattering effects on GNSS signals, producing rapid fluctuations of the signal phase and amplitude as a result. Such scintillations of GNSS signals are responsible for critical consequences regarding applications, such as precise positioning, due to many resulting effects: cycle slips, signal power fading, receiver loss of lock and poor resulting satellite geometry. Ionospheric Scintillation Monitoring Receivers collect high-rate GNSS data. Specific scintillation parameters, such as the well-known S4 and Phi60 indices, are built on high-rate measurements performed on GNSS signals and provide additional information to characterize the intensity of such an event occurring at a specific geographic location at a given time. Spatial Statistics belong to the field of Spatial Analysis, Geography and GIS (Geographic Information System). This discipline allows to perform analyses of data which are localised in space. Ionospheric Scintillation observations achieved by ISMR stations can be characterized by a set of attributes (S4, Phi60, Rate of TEC, etc.) including also the geographic location of their respective Ionospheric Pierce Point (IPP). By combining the simultaneous Multi-GNSS ISMR measurements from a network of ISMR stations, we can obtain a spatially denser data set, able to support spatial statistics tests. The idea of our research is to provide a spatio-temporal analysis of ionospheric scintillation events over Equatorial regions by applying spatial statistics on ISMR Multi-GNSS measurements. In particular, by using spatial statistics, we aim to resolve specific issues regarding ionospheric scintillation data from an ISMR network established in Brazil. The research consists in spatially describing the data set, detecting and measuring potential spatial autocorrelation, determining the scale of the spatial dependency and finally producing an interpolated scintillation sky map at a given time. In terms of applicability of the methodology, our research project consists in exploiting the spatio-temporal analysis performed on ionospheric scintillation data in order to improve the performances and the reliability of Absolute GNSS Positioning algorithms under moderate ionospheric scintillation conditions. By assessing correlations existing between specific ISMR data and classic GNSS observations, the method could be extended to a more general usage which would be independent of ISMR measurements. [less ▲]

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See detailThe physical education teacher as a physical activity promoter: Current developments
Cloes, Marc ULg

Conference (2014, November 19)

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity ... [more ▼]

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity at school? (2) Why the PE teacher should play a central role? (3) How the PE teacher could play such role? In conclusion, it is important to remember that (1) PE teachers should become the cornerstones of the PA promotion at school; (2) They have to be involved in PE as well as in the other dimension of PA at school; (3) They have to collaborate (they are not alone), and; (4) Pre service and inservice PETE has to be adapted to show the way and change the mentalities [less ▲]

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See detailDesign and implementation of a T impedance matching network for the radiocommunication subsystem aboard the OUFTI-1 nanosatellite
Boutaayamou, Mohamed ULg; Crosset, Nicolas ULg; Werner, Xavier ULg et al

in Proceedings of the URSI Forum 2014 (2014, November 18)

We describe how we handled an unexpected impedance matching issue on the receiver side (at UHF) of the radiocommunication system aboard the OUFTI-1 nanosatellite of the University of Liège. Our approach ... [more ▼]

We describe how we handled an unexpected impedance matching issue on the receiver side (at UHF) of the radiocommunication system aboard the OUFTI-1 nanosatellite of the University of Liège. Our approach relied on a combination of novel analytical developments combined with experimentation. [less ▲]

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See detailGNSS observational bias in the frame of ionospheric studies
Wautelet, Gilles ULg; Warnant, René ULg

Poster (2014, November 17)

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See detailContrasting the role of Ih and ICaT currents in post-inhibitory rebound mechanisms in reciprocal-inhibitory networks
Dethier, Julie ULg; Drion, Guillaume; Sepulchre, Rodolphe

Poster (2014, November 16)

Models with reciprocal inhibition are ubiquitous in the literature. For instance, common rhythmic motor behaviors produced by central pattern generators (CPGs) involve half-center oscillators, which ... [more ▼]

Models with reciprocal inhibition are ubiquitous in the literature. For instance, common rhythmic motor behaviors produced by central pattern generators (CPGs) involve half-center oscillators, which consist of two inhibitory neurons that are not endogenous oscillators, but produce rhythmic outputs when reciprocally connected (Marder & Calabrese 1996). Models of thalamocortical spindle oscillations also suggest that the rhythm originates from the thalamic reticular nucleus, which consists in interacting inhibitory nonoscillatory neurons (Wang & Rinzel 1992). [less ▲]

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See detail"Preußisch-deutsch" und "wallonisch". Zur Identitätsproblematik der Malmedyer Wallonie im Ersten Weltkrieg
Brüll, Christoph ULg

Conference (2014, November 15)

Durch die Artikel 32-34 des Versailler Vertrags wurden die beiden deutschen Grenzkreise Eupen und Malmedy nach einer umstrittenen Volksbefragung im Jahr 1920 Belgien zugeschlagen. Dabei wies der Kreis ... [more ▼]

Durch die Artikel 32-34 des Versailler Vertrags wurden die beiden deutschen Grenzkreise Eupen und Malmedy nach einer umstrittenen Volksbefragung im Jahr 1920 Belgien zugeschlagen. Dabei wies der Kreis Malmedy eine Besonderheit auf: er war zwei- bzw. dreisprachig Deutsch-Wallonisch-Französisch. Tatsächlich waren rund 10.000 Wallonen seit den Entscheidungen des Wiener Kongresses von 1815 Bürger Preußens und später des Kaiserreichs gewesen. Der Beitrag fragt nach ihrer Identität im Kaiserreich, wo sie zu Kollateralopfern der gegen größere Minderheiten gerichteten Germanisierungspolitik wurden, woraus ein wallonischer Kulturpartikularismus an der deutsch-belgischen Grenze resultierte. Dabei wird auch deren Offenheit während des langen 19. Jahrhunderts deutlich, die durch intensive grenzüberschreitende soziale, wirtschaftliche und auch kulturelle Kontakte gekennzeichnet ist. Der Beginn des Ersten Weltkriegs wurde deshalb als umso dramatischer empfunden. Die Haltung der Bevölkerung in der so genannten Preußischen Wallonie während des Kriegs ist jedoch bisher von der Forschung kaum in den Blick genommen worden. Deutlich lässt sich jedoch der Einfluss eines sich nunmehr erheblich beschleunigenden Nationalisierungsprozesses an der Grenze zum besetzten Belgien ausmachen. Auf der Grundlage der im Staatsarchiv Eupen erhaltenen Bestände des Kreisarchivs Malmedy im Kreis sollen die Auswirkungen des Krieges auf die kleinste Minderheit im Westen dargestellt werden. Gefragt werden soll nach Misstrauensbekundungen „von oben“, nach potentiellen Loyalitätskonflikten, z.B. in Form von Desertionen, ggf. nach Nachkriegsvorstellungen der Betroffenen und nach einem Wandel von Zugehörigkeitsgefühlen. Besonderes Augenmerk wird dabei auf jene (überaus seltenen) Akteure gelegt, die schon vor 1914 einen Anschluss des Gebietes an Belgien gefordert hatten und die sich der besonderen Aufmerksamkeit der preußischen Behörden gewiss sein konnten. Kaum zu überschätzen ist auch die Bedeutung der Pfarrer, die in einer als streng katholisch geltenden Region erheblichen Einfluss auf das politisch-gesellschaftliche Leben und – selbstverständlich – auf die Trauerarbeit für gefallene Soldaten (deren Zahl sich auf einige Hundert beläuft) nahmen. Nicht zuletzt stellt sich die Frage nach der Erfahrung des Kriegsendes und der darauf folgenden Besatzungszeit durch britische Truppen, die im August 1919 von belgischen Soldaten abgelöst wurden. Diese Fragen sind bisher, so sie denn überhaupt gestellt worden sind, zumeist aus der Perspektive des Staatenwechsels von 1920 beantwortet worden. Der Kampf einiger Akteure für die Behauptung einer wallonischen Identität innerhalb des Kaiserreichs wurde in der belgisch-nationalen Historiographie zu einem Kampf für die Eingliederung durch Belgien umgedeutet, die Zugehörigkeit zu Preußen zum dark age der lokalen Vergangenheit erklärt – wobei die Zugehörigkeit zur französisch-wallonischen Sprachgemeinschaft hier eine andere Ausgangslage schaffte als für ebenfalls an Belgien abgetretenen deutschsprachigen Gemeinden um die Städte Eupen und St. Vith. Diese Narrative entfalteten ihre durchschlagende Wirkung jedoch erst nach dem Zweiten Weltkrieg und der 1940 erfolgten Wiedereingliederung Eupen-Malmedys durch das „Großdeutsche Reich“. Der Beitrag unternimmt den Versuch, die Entwicklung der Jahre 1914-1920 nicht von ihrem Ende her zu betrachten, wobei der – bisher vernachlässigten – erfahrungsgeschichtlichen Perspektive besondere Bedeutung zukommt. Insofern zielt er ebenfalls darauf ab, die Grenzgeschichte aus der Zentrum-Peripherie-Perspektive zu lösen und – auch sehr kleine – Grenzregionen als Akteur (und nicht als bloßes Objekt) zu fassen. [less ▲]

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See detailRé-créations familiales entre ruptures, pertes et nouvelles appartenances
D'Amore, Salvatore ULg

Conference (2014, November 14)

Les familles recomposées font face à de multiples transitions.Au cœur de ces transitions, différents processus de redéfinition interactionnelle et mythique sont attendus. Parmi ceux-ci, la construction ... [more ▼]

Les familles recomposées font face à de multiples transitions.Au cœur de ces transitions, différents processus de redéfinition interactionnelle et mythique sont attendus. Parmi ceux-ci, la construction des nouvelles appartenances qui prévoit la gestion des ruptures ainsi que la construction de nouveaux repères affectifs et sociaux. Dans la pratique psychothérapeutique, nous rencontrons souvent des couples et des familles qui ont « mal » aux transitions et qui se proposent comme « suspendues » entre un passé non reproductible et un futur imperceptible. A travers des situations cliniques et de recherche avec des familles recomposées, l’intervention portera sur l’intérêt d’aborder ces transitions complexes à travers le concept de perte ambiguë. Ce travail prévoit, non pas tant une élaboration définitive des précédentes appartenances mais bien une co-création de ponts affectifs entre le passé et le présent, l’écriture de nouveaux scripts pour le futur ainsi que la gestion d’appartenances multiples et ce, également à travers la re-dynamisation de ressources et de potentialités évolutives chez les couples, familles et leurs réseaux. [less ▲]

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

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 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 detailQuality of work life of rural emergency department nurses and physicians: a pilot study
Bragard, Isabelle ULg; Dupuis, Gilles; Archambault, Patrick et al

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 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 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 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 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 detailÉmissions gazeuses en production porcine
Philippe, François-Xavier ULg

Conference (2014, November 04)

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

Poster (2014, November)

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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 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 detailLe TSM (Test Spectral Métacognitif) : 10 caractéristiques pour relever 5 défis de la formation
Leclercq, Dieudonné ULg

in Actes du 28° Congrès de l'AIPU 2014 Mons Belgique du 18 au 22 mai 2014 (2014, October 30)

Les cinq défis de l'éducation auxquels le TSM vise à apporter des réponses relèvent (1) de la maîtrise d'un domaine disciplinaire, (2) de la maîtrise de'habiletés et compétences générales comme la ... [more ▼]

Les cinq défis de l'éducation auxquels le TSM vise à apporter des réponses relèvent (1) de la maîtrise d'un domaine disciplinaire, (2) de la maîtrise de'habiletés et compétences générales comme la vigilance cognitive et la lecture de consignes, (3) de compétences métacognitives, (4) du développement épistémique et (5) de la motivation à apprendre. Par 10 caractéristiques, le TSM vise à contribuer à ces cinq défis A LA FOIS. Après une introduction théorique à la problématique, un TSM de démonstration (de 16 questions) est présenté. l-Le lecteur peut l'expérimenter sur lui-même, puis télécharger les réponses correctes et enfin traiter ses résultats. [less ▲]

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See detailBetween dialect and idiolect in Deir el-Medineh
Winand, Jean ULg

Conference (2014, October 29)

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See detailRevealed preference tests of collectively rational consumption behavior
Crama, Yves ULg

Conference (2014, October 28)

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests that can be applied to real-world data. These tests check whether the observed ... [more ▼]

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests that can be applied to real-world data. These tests check whether the observed household behavior is "rational", in the sense that it is consistent with the predictions of the model. In this talk, we present different approaches based on revealed preferences to test collective models of household consumption. Testing collective rationality is computationally difficult (NP-hard). In order to overcome this negative result, we introduce mixed-integer programming formulations which can be used for medium-sized data sets. Next, we propose simulated annealing heuristics, which allow for efficient testing of the collective model on large data sets. We present the results of computational experiments using our approaches. [less ▲]

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See detailUTILISATION DES RESIDUS DE LAVAGE DES GRANULATS DE CARRIERES DANS L’ELABORATION DE PIECES CERAMIQUES (REGION DE TAMAZOUZT, MAROC).
El Boudour El Idrissi, Hicham ULg; Daoudi, Lahcen; El Ouahabi, Meriam ULg et al

Conference (2014, October 27)

Le site potier de Tamazouzt est situé à 40 km au Sud-Est de la ville de Marrakech. La production est sous forme de poterie décorative d’ustensiles rustiques. La matière première utilisée dans ... [more ▼]

Le site potier de Tamazouzt est situé à 40 km au Sud-Est de la ville de Marrakech. La production est sous forme de poterie décorative d’ustensiles rustiques. La matière première utilisée dans l’élaboration de ces produits est issue de résidus de lavage des carrières de granulats exploités le long des oueds. En plus de la qualité des produits et des rendements élevés, ce site donne un bon exemple de valorisation des résidus de lavage qui causent des problèmes pour l’environnement et pour les industriels. Nous avons caractérisé cette matière première afin d’en faire la promotion et d’encourager l’exploitation de tels matériaux dans le domaine de la céramique à l’échelle globale. Les résultats des analyses montrent que la pâte est constituée de 62% d’argiles, 23% de limons et 15% de sables ; l’indice de plasticité est de l’ordre de 16. Pour 27% d’humidité, le degré de retrait au séchage ne dépasse pas 6%. La minéralogie indique la présence de quartz (32%), plagioclase (20%), feldspaths potassiques (10%), calcite (3%) et argile (31%). Les minéraux argileux sont constitués d’illite (16%), de chlorite (7%), de kaolinite (4%) et de vermiculite (4%). La teneur en matière organique est de 4%. La composition chimique est surtout silico-alumineuse (64% de SiO2, 17% d’Al2O3). Les autres éléments majeurs dont la teneur est significative (> 1%) sont : Fe2O3 (8%), MgO (4%), K2O (3%), CaO (3%), Na2O (2%). Les pièces cuites à 1050°C présentent 2% de retrait, 13% de porosité à l’eau, la résistance mécanique à la compression et à la flexion est respectivement de 63 et 20 Mpa. L’analyse DRX des pièces cuites à 1050°C a montré l’apparition de géhlénite, anorthite, diopside et d’hématite. Ces résultats indiquent qu’en plus de l’utilisation locale dans la poterie décorative ces argiles pourraient être valorisées comme matériaux de construction vue leur caractère isolant (bonne porosité), résistance (bon comportement mécanique) et leur couleur rouge (présence de l’hématite). [less ▲]

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See detailRecyclage des briques cassées pour améliorer les propriétés céramiques des argiles plastiques (Meknès, Maroc)
El Ouahabi, Meriam ULg; Daoudi, Lahcen; El Boudour El Idrissi, Hicham ULg et al

Poster (2014, October 27)

Dans le Bassin de Saïs (nord ouest du Maroc), les argiles du Miocène de la région de Meknès sont utilisées dans l’industrie céramique locale pour la fabrication des briques. Ces argiles riches en smectite ... [more ▼]

Dans le Bassin de Saïs (nord ouest du Maroc), les argiles du Miocène de la région de Meknès sont utilisées dans l’industrie céramique locale pour la fabrication des briques. Ces argiles riches en smectite et en carbonates, ont une granulométrie très fine, marquée par la quasi absence de la fraction sableuse. Ces propriétés les rendent très plastiques, ce qui engendre des taux de retrait importants au séchage et à la cuisson et des problèmes de qualité du produit fini qui s’en suivent (fissurations, déformations et casses pendant les processus de séchage et de cuisson). Dans le but de palier à ce problème et d’améliorer la qualité du produit fini, nous proposons au cours de cette étude de recycler les déchets de briques cassées. Afin d'atteindre ces objectifs, 4 formulations ont été réalisées à base d’argiles plastiques, riches en smectite et des casses de briques broyées. Des quantités de 5, 10, 15 et 20% de briques broyées ont été ajoutées à la pâte destinée à la confection des briques. Des analyses minéralogiques par diffraction des rayons X (DRX), chimiques par spectrométrie de fluorescence (XRF), granulométrique par granulométrie laser, ainsi que les limites d’Atterberg ont été effectuées. Les résultats minéralogiques montrent une diminution de la teneur en carbonates (calcite) et en argile totale (principalement smectite), lors des ajouts successifs de briques broyées. La fraction sableuse augmente progressivement, jusqu’à atteindre 30% pour une formulation avec 20% de casses de briques. Cette granulométrie plus grossière diminue la plasticité de la pâte et permet d’éviter les déformations et les fissures pendant le processus du séchage. De plus, l’ajout des casses de briques dilue les carbonates, ce qui permet d’améliorer la qualité du produit cuit. Ces résultats indiquent que le recyclage des déchets de briques, présente un intérêt à la fois économique et écologique. Des essais de comportement au séchage et à la cuisson ainsi que des essais mécaniques complèteront cette étude. [less ▲]

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See detailDouble stigmatization influence in oncogeriatry
Schroyen, Sarah ULg; Adam, Stéphane ULg; JERUSALEM, Guy ULg et al

in Psycho-oncology (2014, October 24)

Introduction Cancer is a major health problem widespread in elderly, which is inscribed in ageism context1. Negative influence of the vision that older people possess on aging on mental and physical ... [more ▼]

Introduction Cancer is a major health problem widespread in elderly, which is inscribed in ageism context1. Negative influence of the vision that older people possess on aging on mental and physical health2 is well established within “normal” aging. Consequently, we can ask ourselves what consequences age stigmas have in the realm of oncogeriatry. Moreover, cancerous patients face pathology-related stigmas because nowadays cancer still conveys a lot of negative representations. Method A group of 120 patients aged of 65 years old and more suffering from cancer (lung, breast or gynecological) will be followed during one year (0-3-6-12 months). Different instruments measuring quality of life, depression, symptoms, etc. are used as well as questions about their vision of aging and of cancer. Clinical parameters (weight, biologicals values, comorbidity…) are recorded too. Currently, we have 63 patients (31 breast cancer, 14 gynecological cancer and 18 lung cancer with distinction between smokers and non-smokers). Our analysis is only on the baseline at this moment, without any distinction between kinds of cancers. Results Double ANOVAs were used to analyze the data. A positive vision of aging is linked to a lower level of depression in comparison to a negative vision of aging (p = .04). Vision of pathology approach significance: less depression when vision is positive (p = .077). Concerning daily functioning (physical, emotional, social...), a positive vision of aging is related to a better functioning (p = .03) whereas vision of pathology has no effect. Eventually, a positive vision of aging and of cancer is related to a better quality of life (respectively p=.02, p=.002). Concerning clinical parameters, no results are observed. Conclusion These first results suggest that the vision patients have themselves of the age and of cancer is in relation with subjective mental and physical health. As we observe influence on vision of aging as well as pathology, we can talk about “double stigmatization”. Needless to say, more studies are needed to analyze the direction of these observation and longitudinal data analysis could bring some answers: is stigmatization provoke a less good mental and physical health or is it because I have health problem that I have a negative vision of aging and of my disease? 1. Penson, R. T., et al. (2004). The Oncologist, 9, 343-352. 2. Levy, B. (2009). Curr Dir Psychol Sci, 18, 332-336. [less ▲]

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See detailUniversité : Les interactions possibles avec l’enseignement non-universitaire
Winand, Jean ULg

Conference (2014, October 23)

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See detailThe effect of Brand Anthropomorphism on Self-Disclosure
Gretry, Anaïs ULg; Horváth, Csilla; Belei, Nina et al

Conference (2014, October 23)

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See detailThe Initial Upper Paleolithic in Northeast Asia: toward the definition of a techno-complex
Zwyns, N.; Teyssandier, N.; Izuho, M. et al

Conference (2014, October 23)

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See detailReformage catalytique du toluène
Claude, Vincent ULg; Lambert, Stéphanie ULg; Courson, Claire

Poster (2014, October 23)

This poster summarizes results obtained for the catalytic reforming of tar in the oultlet gas of a biomass gasifier. All samples were synthesized with aluminum nitrate and an organosilane (EDAS) in order ... [more ▼]

This poster summarizes results obtained for the catalytic reforming of tar in the oultlet gas of a biomass gasifier. All samples were synthesized with aluminum nitrate and an organosilane (EDAS) in order to enhance the metallic dispersion and surface area. Three different compositions have been studied (Al2O3-SiO2; Al2O3-SiO2+2%wt Ni; Al2O3-SiO2+10%wt Fe). The catalytic tests highlight the fact that the sample containing 2%Ni wt is the more appropriate in our conditions. [less ▲]

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See detailAnalysis of the interactions of natural elicitor rhamnolipids with plant plasma membranes by in silico methods
Polo Lozano, Damien ULg; Nasir, Mehmet Nail ULg; Deleu, Magali ULg et al

Poster (2014, October 20)

Rhamnolipids are surface active molecules produced mainly by various strains of the bacterium Pseudomonas aeruginosa. These secondary metabolites are composed of one to three fatty acids with various ... [more ▼]

Rhamnolipids are surface active molecules produced mainly by various strains of the bacterium Pseudomonas aeruginosa. These secondary metabolites are composed of one to three fatty acids with various chain lengths linked through a glycosidic bond to one or two rhamnose moieties. The fatty acids are linked together through an ester bond. These molecules have shown several biological activities including plant defense stimulation. It has be suggested that this elicitor activity could be related to an interaction of rhamnolipids with the lipid bilayer of the plant plasma membrane (PPM) and lead to its destabilization, which can activate the plant defense signaling pathways. In this context, interactions of two rhamnolipids (Rha-C10-C10 and Rha-Rha-C10-C10) with membrane models and lipidic constituents of the PPM were investigated using in silico approaches. Most probable chemical structures of the rhamnolipids were determined using the STRUCTURE TREE procedure according to the molecule potential energy. The ability of these rhamnolipid structures to insert within the PPM was assessed using IMPALA simulations. IMPALA uses a membrane model in which phospholipids molecules are implicitly modeled by an empirical function and the membrane properties are modeled by energetic restraints. The ability of each rhamnolipid structure to form an assembly with several PPM constituents (phospholipid (PLPC), sterols (Sitosterol, Stigmasterol, Campesterol) and sphingolipids (GIPC, Glucosylceramide)) was calculated using the HYPERMATRIX procedure, which calculate and minimize the energies of interaction between all molecules of the complex until the lowest energy structure is reached. [less ▲]

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See detailInsights upon the adsorption mechanism of KAX on malachite
Kanda, Jean-Marie; Kongolo, Mukendi; Gaydardzhiev, Stoyan ULg et al

in Yianatos, Juan (Ed.) Proceedings of the XXVII International Mineral Processing Congress (2014, October 20)

The adsorption patterns of potassium amylxanthate on the surface of high purity malachite subjected to prior sulfidization with NaSH have been followed and elucidated. DRIFTS spectroscopy has been used to ... [more ▼]

The adsorption patterns of potassium amylxanthate on the surface of high purity malachite subjected to prior sulfidization with NaSH have been followed and elucidated. DRIFTS spectroscopy has been used to trace the associated physicochemical alterations as well as the chemical species present on the mineral surface. Varying the collector concentration from 5.10-4 to 1.10-2 mol/L has led to different degree of surface coverage of the alkyl groups in combination with formation of organometallic hydrophobic complexes of CuX and CuX – X2 type. The results reveal that the CuX complex formed on the malachite surface without sulfidizing agent is more unstable and prone to dissolution-precipitation phenomena. Based upon the constructed adsorption isotherms and upon the degree of statistical coverage, different zones of mineral-reagent interactions could be distinguished. They correspond respectively to the monolayer, bi-layer and tridimensional condensation domains. In each of the identified zones mono or double layer adsorption patterns of the collector are proposed leading respectively to formation of surface compounds with different degree of hydrophobicity. [less ▲]

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See detailAdvances in the synthesis of degradable polymers for biomedical applications
Lecomte, Philippe ULg

Conference (2014, October 20)

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See detailPhysicochemical observations during process water reuse in flotation of oxide copper-cobalt ore
Shengo, Michel; Gaydardzhiev, Stoyan ULg; Kalenga, Pierre

in Yianatos, Juan (Ed.) Proceedings of the XXVII International Mineral Processing Congress (2014, October 20)

Lab-scale flotation of copper and cobalt oxidized ore from the Luiswishi deposit in the Katanga province (DRC) has been done focusing on the influence of the degree of process water recycling on metals ... [more ▼]

Lab-scale flotation of copper and cobalt oxidized ore from the Luiswishi deposit in the Katanga province (DRC) has been done focusing on the influence of the degree of process water recycling on metals recovery. Results have shown that at 20 % recycling rate, the recovery of copper and cobalt in the cleaner stage have been respectively reduced to 23 % and 45 % in comparison to 53 % Cu and 63 % Co if process water has not been recycled. At 10 % recycling rate however, the system could still tolerate the effect from recycling, since Cu and Co recovery has remained respectively at acceptable levels of 52 % and 60 %. In order to explain the reasons for the observed worsening of flotation results if process water was recycled at rate higher than 20 %, electrochemical investigation of the pulp has been performed. It has been established that the chemical compounds formed in the pulp when process water was recycled, do influence the sulfidization of malachite and heterogenite and impact further collector adsorption. To confirm these assumptions, the effect from thiosulphate ions presence during the sulfidization of high purity malachite has been studied. It has been found, that thiosulphate ions depending on their concentration in water induce variations in pulp properties such as DO content, pH, Es and contribute to formation of undesirable chemical compounds on mineral surface as identified by DRIFT spectroscopy. [less ▲]

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

Conference (2014, October 19)

The present paper looks into the problem of optimizing the loading of a set of containers and pallets into cargo aircraft serving multiple airports. Due to the pickup and delivery operations occurring at ... [more ▼]

The present paper looks into the problem of optimizing the loading of a set of containers and pallets into cargo aircraft serving multiple airports. Due to the pickup and delivery operations occurring at intermediate airports, this problem is simultaneously a weight and balance problem and a sequencing problem. Our objective is to minimize fuel and handling operations costs. This problem is shown to be NP-hard. We resort to a mixed integer linear program. On the basis of a professional partner's real-world data, TNT Airways, we perform numerical experiments using a standard B&C library. This approach yields better solutions than traditional manual planning, which results in substantial cost savings. [less ▲]

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See detailFamilial hypocalciuric hypercalcemia : a rare cause of recurrent pancreatitis
Daniel, Sara ULg; Potorac, Iulia ULg; MALAISE, Olivier ULg et al

in Abstract book - 24th Meeting of the Belgian Endocrine Society (2014, October 18)

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See detailA novel mutation of the luteinizing hormone/choionic gonadotrophin receptor gene leading to Leydig cell hypoplasia type I
Potorac, Iulia ULg; Rivero-Müller, Adolfo; Pintiaux, Axelle ULg et al

in Abstract book - 24th Meeting of the Belgian Endocrine Society (2014, October 18)

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See detailCharacterization of paragangliomas : a single center cohort study
VROONEN, Laurent ULg; Maiga, Ibrahima ULg; PETROSSIANS, Patrick ULg et al

in Abstract book - 24th Meeting of the Belgian Endocrine Society (2014, October 18)

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See detailVascular endothelial growth factor: a blood biomarker in canine idiopathic pulmonary fibrosis.
Roels, Elodie ULg; Krafft, Emilie ULg; Laurila, HP et al

Poster (2014, October 17)

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See detailPhenotyping Belgian Blue cattle for their susceptibility to psoroptic mange
Abos, Romain ULg; Coussé, Annelies; Sarre, Charlotte et al

Poster (2014, October 17)

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See detailLocal goat in Kabylie (Chemini and Bouzeguene)
Moula, Nassim ULg; Michaux, Charles ULg; Philippe, François-Xavier ULg et al

Poster (2014, October 17)

The livestock sector plays a dynamic role in the economic development of rural areas in Algeria. Due to its adaptation to harsh environments, goat breeding is practiced in many areas of the country. To ... [more ▼]

The livestock sector plays a dynamic role in the economic development of rural areas in Algeria. Due to its adaptation to harsh environments, goat breeding is practiced in many areas of the country. To the north, it is confined to mountainous areas, but the bulk of the workforce is left in the steppe and semi-desert areas. The goat population in Algeria reached 3.8 million heads, ranking second after sheep. The present work contributes to a better characterisation of local goat in Kabylie for production and reproduction traits. The study was conducted in the regions of Chemini (Bejaia province) and Bouzeguene (Tizi-Ouzou province). A survey was conducted in 29 herds. The results revealed that the overall mean of goats per households was 6.69 ± 2.97. The purposes of keeping goat in Chemini and Bouzguene was private consumption of milk (82.76%) and meat (68.97%) as well as for commercial exchange (62.07%). The Kabyle goat is small (male: 62.23 cm and female: 58.41 cm) with long hair. Its ears are drooping, its convex profile has a slightly pronounced nasal split and its coat colour ranges from dark brown to black. However, the crossbreeding with exotic breeds (mainly with Saanen goat), controlled or uncontrolled, increased the frequency of white coat. The average age at puberty in males was 6.93 ± 1.04 and 7.38 ± 0.94 months in females. The reported age at first kidding and kidding interval were 13.03 ± 0.87 months and 7.83 ± 1.29 months, respectively. [less ▲]

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See detailMélancolie et dépression : étude phénoménologique
Ramackers, Amélia; Englebert, Jérôme ULg

Poster (2014, October 17)

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See detailAn evaluation of anthropometric and conditional indicators for specific positions in youth women's volleyball played as a school sport
Joao, Paulo Vicente; Contiuga, Ioana; Pereira, Ana et al

in Science & Sports (2014, October 17), 29(Hors-série 1), 31

The present study aimed to identify anthropometric and functional characteristics of female volleyball players according to their specific in the match.

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See detailDépression, niveau d'engagement dans des activités et processus psychologiques : Nouvel axe de lecture et nouveaux outils d'évaluation
Wagener, Aurélie ULg

Conference (2014, October 17)

Cet atelier aura pour objectif de présenter un modèle théorique, testé auprès de 500 personnes, des liens entre la dépression, le niveau d’engagement dans des activités et différentes familles de ... [more ▼]

Cet atelier aura pour objectif de présenter un modèle théorique, testé auprès de 500 personnes, des liens entre la dépression, le niveau d’engagement dans des activités et différentes familles de processus psychologiques (image de soi, pensées négatives répétitives, évitement expérientiel, satisfaction environnementale, régulation émotionnelle et tendance à l’approche). Plus précisément, nous menons actuellement une étude dont les résultats nous permettront d’identifier les processus psychologiques médiateurs de la relation entre la dépression et le niveau d’engagement dans des activités. Ces processus psychologiques médiateurs pourront donc devenir des cibles précises et identifiées du traitement psychothérapeutique. Pour mener à bien cette étude, nous avons réalisé une revue de la littérature des outils évaluant spécifiquement ces processus psychologiques. Certains questionnaires ont été traduits de l’Anglais au Français et sont en cours de validation. L’ensemble des échelles utilisées, leur utilité et leur cotation, seront présentées lors de l’atelier. Elles seront également mises à disposition des cliniciens intéressés. Une discussion concernant les patients avec lesquels les utiliser sera également proposée. [less ▲]

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See detailL'evidence-based practice en psychologie et en logopédie
Durieux, Nancy ULg

Conference (2014, October 17)

L’evidence-based practice (EBP) est une approche qui recommande d’optimiser les soins de santé en intégrant les meilleures données actuelles issues de la recherche scientifique, l’expertise des cliniciens ... [more ▼]

L’evidence-based practice (EBP) est une approche qui recommande d’optimiser les soins de santé en intégrant les meilleures données actuelles issues de la recherche scientifique, l’expertise des cliniciens ainsi que la situation et les préférences de chaque patient (Sackett et al., 1996). L’EBP fait couler beaucoup d’encre en médecine, où elle prend sa source, mais également dans d’autres disciplines. Certains praticiens ne jurent que par elle, d’autres la décrient… Quoiqu’il en soit, le recours à l’EBP est de plus en plus encouragé en logopédie et en psychologie. Les principaux objectifs de cette conférence seront de définir l’EBP, d’en décrire les étapes et d’exposer les bénéfices et les obstacles à son application. Des perspectives d’avenir seront également discutées afin que l’EBP puisse intégrer le quotidien des logopèdes et des psychologues en Belgique. [less ▲]

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See detailLa psychomotricité avec poney ou équimotricité© : vidéo
Saublens, Catherine; Cloes, Marc ULg

in Science & Sports (2014, October 17), 29(Hors-série 1), 11

Physical activity has a positive impact ont child's grow, on his global development and wellness. Implemented in 2007, equimotricity corresponds to motor development activities organized in a outdoor ... [more ▼]

Physical activity has a positive impact ont child's grow, on his global development and wellness. Implemented in 2007, equimotricity corresponds to motor development activities organized in a outdoor track where children act in teams of two. [less ▲]

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See detailEffet de l'expertise musicale sur la perception de la justesse vocale
Gosselin, Laura; Morsomme, Dominique ULg; Larrouy, Pauline ULg

Poster (2014, October 17)

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See detailL’équimotricité© : bases théoriques, principes d’action et constats informels
SAUBLENS, Catherine; Cloes, Marc ULg

in Science & Sports (2014, October 17), 29(Hors-série 1), 49

L'évolution actuelle de la société amène une dégradation du niveau de développement moteur et de condition physique des enfants. L'équimotricité© a été créée en 2007 et connait depuis lors un ... [more ▼]

L'évolution actuelle de la société amène une dégradation du niveau de développement moteur et de condition physique des enfants. L'équimotricité© a été créée en 2007 et connait depuis lors un développement important. Cette présentation fournit une description des modalités d'organisation de cette activité destinée à enrichir les opportunités de pratique des jeunes enfants. [less ▲]

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See detailThe effect of the inclusion of Urtica dioica leaves meal in diets on growth performances and carcass characteristics of broiler
Moula, Nassim ULg; Philippe, François-Xavier ULg; Michaux, Charles ULg et al

Poster (2014, October 17)

The objective of this study was to evaluate the effects of the inclusion of Urtica dioica leaves meal in diets on growth performances and carcass characteristics of broiler chicken. The study was ... [more ▼]

The objective of this study was to evaluate the effects of the inclusion of Urtica dioica leaves meal in diets on growth performances and carcass characteristics of broiler chicken. The study was conducted from May to June 2014 in the area of Chemini (Algeria). In a completely randomized design, a total of 100 one-day-old broilers (industrial strain) were divided into 2 groups and 2 repetitions with 25 chickens each. Group 1 was the control group fed a standard commercial diet based on corn and soybean purchased on the local market, whereas the birds in group 2 were fed the nettle diet (control diet with addition of 2% of nettle). The animals were housed inside in experimental pens and fed ad libitum. The results showed that nettle inclusion significantly promotes growth performance of broilers at 42 days of age (1644.8 ± 45.5 vs. 1565.1 ± 45.5g; P<0.05). The broilers fed the nettle diet had higher thigh yield (26.0 ± 0.3 vs. 25.2 ± 0.3%; P<0.05) but lower abdominal fat yield (4.39 ± 0.16 vs. 3.90 ± 0.16%; P<0.05). No significant effect of the diet was observed for carcass yield (around 71.1%) and breast percentage (around 32.40%). The overall mortality was not significantly different (P>0.05) for any of the dietary regimens (around 20%). Feed conversion ratio of the two groups were very close (around 2.17). This experiment showed that dietary inclusion of Urtica dioica has positive effects on growth performance and carcass quality of broilers. [less ▲]

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See detailAnalyse du point de vue des enseignants sur la mise en place de « Brain Break » dans l’enseignement primaire. Étude de cas
Cloes, Marc ULg; Mornard, Manhattan ULg

in Science et sports (2014, October 17), 29(Hors-série 1), 25

Children have a natural need of movement. It seems logical to develop processes that could be used during classroom teaching. Our study aims to test one didactic approach allowing primary school pupils to ... [more ▼]

Children have a natural need of movement. It seems logical to develop processes that could be used during classroom teaching. Our study aims to test one didactic approach allowing primary school pupils to express their movement need. [less ▲]

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See detailPratique de l’équimotricité© : motifs de participation et perception de l’impact
Saublens, Catherine; Cloes, Marc ULg

in Science et sports (2014, October 17), 29(Hors-série 1), 17

La littérature souligne toute l'importance du développement moteur chez les enfants. De nombreux parents s'efforcent de trouver, au sein de la communauté, des activités susceptibles de palier le manque d ... [more ▼]

La littérature souligne toute l'importance du développement moteur chez les enfants. De nombreux parents s'efforcent de trouver, au sein de la communauté, des activités susceptibles de palier le manque d'occasions de pratique de ces derniers. La participation à des séances au cours desquelles les enfants alternent des périodes d'activité physique sur un poney et au cours desquelles ils conduisent ce dernier est considérée par les parents comme très bénéfique à leur développement. [less ▲]

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See detailExpérimentation des « Brain Break » dans l’enseignement primaire. Avis des élèves
Cloes, Marc ULg; Mornard, Manhattan ULg

in Science & Sports (2014, October 17), 29(Hors-série 1), 52

L'école est identifiée comme un des piliers de la lutte contre la sédentarité des jeunes. Une société américaine (HOPSports) conçoit et diffuse des séquences de quelques minutes qui mettent en scène des ... [more ▼]

L'école est identifiée comme un des piliers de la lutte contre la sédentarité des jeunes. Une société américaine (HOPSports) conçoit et diffuse des séquences de quelques minutes qui mettent en scène des personnages, réalisant des activités à imiter en classe: les 'Brain Breaks' (BB). Ces videos ont été proposées pendant trois mois dans deux écoles primaires de la région liégeoise. L'opinion des élèves est positive mais leurs attitudes à l'égard de l'école et de l'activité physique ne change guère. [less ▲]

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See detailLes îles (d')où fuir. Poétique croisée de la robinsonnade et de l'anticipation
Stienon, Valérie ULg

Conference (2014, October 17)

Il existe des parentés remarquables entre certaines caractéristiques du roman d’aventures et les premières fictions d’anticipation françaises. Il n'y a pas seulement que la notion d’"aventure" est floue ... [more ▼]

Il existe des parentés remarquables entre certaines caractéristiques du roman d’aventures et les premières fictions d’anticipation françaises. Il n'y a pas seulement que la notion d’"aventure" est floue, composant une catégorie infiltrante tenant de l’hypergenre ou du genre parasite, mais il existe aussi des propriétés communes formant un genre hybride de « science-fiction d’aventures» qui compose un corpus important, pourtant peu considéré par les études littéraires consacrées au récit d'anticipation. Envisagé sous cet angle, tout un pan de la production d’anticipation de la seconde moitié du XIXe siècle apparaît comme marqué par le déplacement géographique autant sinon davantage que par le voyage temporel, cultivant une plasticité qui permet dans certains cas des reprises à l’identique ou presque. Ce sont ces procédés d’hybridation qui font l'objet de cette communication, à partir d’un type de récits généralement considéré comme un sous-genre matriciel de l’aventure, la robinsonnade, considérée dans quatre romans du dernier quart du XIXe siècle: André Laurie, Les Exilés de la Terre; Georges Le Faure, Les Robinsons lunaires; Jules Verne, L'Île à hélice; Paul Adam, Lettres de Malaisie. [less ▲]

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See detailThe Effect of Urtica dioica Supplements on Egg Quality
Touazi, Leghel; Moula, Nassim ULg

Poster (2014, October 17)

Eggs are a rich source of lipids and proteins. Because of their low production cost, they represent a cheap source of animal proteins and lipids. recently, in Algeria, consumers’ interest are oriented of ... [more ▼]

Eggs are a rich source of lipids and proteins. Because of their low production cost, they represent a cheap source of animal proteins and lipids. recently, in Algeria, consumers’ interest are oriented of healthiness and dietetic values food. The purpose of this study was to investigate the effects a dietary supplement of Urtica dioica on laying hen's performance and egg quality. The study was conducted from may to june 2014 in the area of Chemini (Algeria). Sixty, 25-wk-old Lohmann Brown layers were randomly divided into 3 groups with 20 hens in each group. Group 1 was the control group fed a standard commercial diet based on corn and soybean, whereas the groups 2 and 3 were fed the control diet supplemented with 1% and 1.5% of nettle respectively. The hens were housed in cages in the same local and fed ad libitum. Fifty five eggs were sampled 4 times in each group from 25 to 27 weeks. A total of 220 eggs were examined. A series of measurements were carried out on each egg, namely egg weight, form index (egg shape), yolk to albumen ratio (Y:A), Yolk color, egg shell thickness, Haugh’s units. Egg weight, yolk color and Haugh Units (HU) were affected by age. Significant differences (P<0.05) were recorded between feeding type in total egg weight, yolk color and Haugh Units. The egg from group 2 proved to have a higher egg weight (57.67g; group 1: 55.41g; group 3: 56.70g; P<0.05), (33.4%), intermediate Yolk color (8.53; group 1: 9.03 ; group 3: 9.38; P<0.05) and HU (79.81; group 1: 80.85; group 3: 76.92). The results showed that the use of 1% and 1.5% of Urtica dioica, had positive effects on the color of yolk of laying hens. Using different levels of Urtica dioica could change the characteristics of egg and could meet the preferences of consumers for the intense color of the yolk. [less ▲]

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See detailL'intolérance environnementale idiopathique attribuée aux champs électromagnétiques (IEI-EMF)
Demaret, Isabelle ULg

Poster (2014, October 16)

Depuis le début des années '80, des chercheurs étudient les plaintes des personnes se disant hypersensibles aux champs électromagnétiques (EMF), sous les normes recommandées. Les recherches n'ont ... [more ▼]

Depuis le début des années '80, des chercheurs étudient les plaintes des personnes se disant hypersensibles aux champs électromagnétiques (EMF), sous les normes recommandées. Les recherches n'ont cependant pas démontré que ces personnes étaient capables de détecter les EMF ni qu'elles présentaient des changements physiologiques en étant exposées aux EMF . L'OMS a regroupé ces plaintes sous le nom d'Intolérance Environnementale Idiopathique attribuée aux Champs Electromagnétiques (IEI-EMF). Au niveau médical, l'IEI-EMF est classée parmi les syndromes fonctionnels somatiques comme d'autres syndromes sans bases physiologiques démontrées. [less ▲]

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See detailGuidance Document: Background information on Uncertainty of Measurement
Dumont, Fabien ULg

Conference (2014, October 14)

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