References of "Scientific congresses and symposiums"
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See detailSharing in neuroimaging: collecting with Brainmap, quantitatively analysing and sharing with ANIMA
Genon, Sarah ULg; Reid, Andrew; Eickhoff, Simon

Conference (2015, September 14)

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See detailCorporate Board Attributes and CAC: A Comparative Study of France, Germany and UK
Boussaid, Nabila ULg; Hamza, Taher; Sougné, Danielle ULg

Conference (2015, September 14)

This paper investigates the impact of corporate board of directors’ attributes on conditional accounting conservatim in the French, German and British contexts. Using pooled regression model over the ... [more ▼]

This paper investigates the impact of corporate board of directors’ attributes on conditional accounting conservatim in the French, German and British contexts. Using pooled regression model over the period 2009-2012, our findings report that the relationship between corporate board attributes and accounting conservatism is country dependent. First, regarding the board composition, we find that the effect of board size is positive for German firms, negative for French firms and insignificant for British firms. We also document a positive association between board independence and accounting conservatism for British firms. However, we find no evidence of a positive association between codetermination and earnings conservatism in German context. Second, female seats on board seem to increase conservative reporting in financial statement only for French firms. Lastly, board meeting frequency in French and British firms appears to increase accounting conservatism. As a robustness test, we use an alternative measure of accounting conservatism namely, time–series of earnings changes measure and confirm the previous results. Overall, our results reveal that corporate board affects the financial reporting quality. [less ▲]

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See detailThe Red Marble of Baelen, an exceptional mid-Famennian mud mound complex in a carbonate ramp setting from Eastern Belgium
Dreesen, Roland; Vachard, Daniel; Marion, Jean-Marc ULg et al

Poster (2015, September 14)

The Red Marble of Baelen from the Limbourg area (Vesdre Basin, Eastern Belgium) represents a member of the middle Famennian (late Upper Devonian) Souverain-Pré Formation (Late marginifera conodont Zone ... [more ▼]

The Red Marble of Baelen from the Limbourg area (Vesdre Basin, Eastern Belgium) represents a member of the middle Famennian (late Upper Devonian) Souverain-Pré Formation (Late marginifera conodont Zone). It corresponds to a short-term transgressive event and eustatic rise during the Famennian, interrupting the regressive megasequence on the Condroz shelf in Belgium. It is the only known or at least the only well-documented mid-Famennian carbonate mud mound complex worldwide, after the end-Frasnian mass extinction that wiped out numerous invertebrate taxa. [less ▲]

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See detailPt-Ni Hollow Nanoparticles for Oxygen Reduction Reaction : Controlling the Nanoparticle Morphology
Asset, Tristan ULg; Zubiaur, Anthony ULg; Chattot, Raphael et al

Poster (2015, September 13)

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See detail18FDG-PET/CT IMAGING IN SUSPECTED ACUTE RENAL ALLOGRAFT REJECTION
LOVINFOSSE, Pierre ULg; WEEKERS, Laurent ULg; BOVY, Christophe ULg et al

Conference (2015, September 13)

The diagnosis procedure for kidney transplant recipients (KTR) with suspected acute rejection (AR) relies on needle biopsy. Noninvasive tests to predict nonrejection would be preferable. AR is associated ... [more ▼]

The diagnosis procedure for kidney transplant recipients (KTR) with suspected acute rejection (AR) relies on needle biopsy. Noninvasive tests to predict nonrejection would be preferable. AR is associated with a recruitment of activated leukocytes into the transplant, which are characterized by a high metabolic activity and an increased uptake of glucose analog, Fluoro-deoxyglucose ( FDG). Thus, FDG-Positron emission tomography coupled with computed tomography (PET/CT) may help noninvasively distinguish nonrejection from AR. From January 2013 to February 2015, we prospectively performed 32 FDGPET/ CT in 31 adult KTR with suspected renal AR who underwent a biopsy. Biopsies were categorized as “normal”, “borderline”, “AR” or “others” according to Banff classification. PET/CT imaging was performed within 201 ± 18 minutes after i.v. administration of 3.2 ± 0.2 MBq/kg of FDG, before any modification of immunosuppression. The mean standard uptake values (SUV) of both upper and lower renal poles were measured, with no threshold activity. Biopsies were diagnosed as “normal”, “borderline”, “AR” or “others” in 8, 10, 8 and 6 (including 3 polyoma-BK nephropathies) cases. Mean SUV respectively reached 1.5 ± 0.2, 1.6 ± 0.3, 2.9 ± 0.8, 2.2 ± 1.2 in each category. Mean SUV of biopsy-proven AR was significantly higher than “normal” cases (p<0.01). No difference was found between “normal” vs. “borderline”, or between “AR” vs. “others” histopathology. Still, a positive correlation between mean SUV and acute composite (g+i+t+v+ptc) Banff score was found, with a coefficient of 0.70 (p<0.001). Sensitivity and specificity of FDG-PET/CT in detecting pathological biospies were respectively 92.3% and 36.8%, with a mean SUV threshold at 1.4. FDG-PET/CT imaging may help discriminate nonrejection, thereby avoiding unnecessary transplant biopsy in KTR with suspected AR. [less ▲]

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See detailGreen synthesis of polyphosphoesters, a promising class of bioinspired degradable materials
Lecomte, Philippe ULg; Baeten, Evelien

Conference (2015, September 11)

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See detailCHEMOKINE (CC-MOTIF) LIGAND 2 AS A PROGNOSTIC SERUM MARKER IN CANINE IDIOPATHIC PULMONARY FIBROSIS
Roels, Elodie ULg; Holopainen, S.; Teske, Erik ULg et al

Poster (2015, September 11)

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See detailNovel organocobalt for the synthesis of functional polymers
Demarteau, Jérémy ULg; Kermagoret, Anthony; Jérôme, Christine ULg et al

Poster (2015, September 11)

Organocobalt(III) with acetylacetonate (acac) ligands is the most representative example of R-Co bearing a labile C-Co bond that can release alkyl radicals under mild experimental conditions without ... [more ▼]

Organocobalt(III) with acetylacetonate (acac) ligands is the most representative example of R-Co bearing a labile C-Co bond that can release alkyl radicals under mild experimental conditions without requiring a photoactivation. The unique isolated R-Co is a short oligo(vinyl acetate) end-capped by Co(acac)2. The high lability of its C-Co bond combined to the unique capacity of Co(acac)2 to reversibly trap alkyl radicals make this R-Co unique for the precision design of unprecedented polymers by Cobalt-Mediated Radical Polymerization (CMRP). The growth of unstabilized and highly reactive growing radicals formed by the addition of R• to unconjugated vinyl monomers (vinyl esters, vinyl amides, vinyl imidazolium, vinyl chloride, etc;) is controlled by the reversible formation of a weak C-Co bond at the polymer chain end. The lack of alternatives to this R-Co, especially to the structure of the alkyl group, has however placed limitations on post-functionalizations of end-chains. Other functional variants that would enable attractive chain-end derivatizations are unfortunately not available. In this poster, we will address this important challenge by describing an innovative synthetic route towards the preparation of new functional R-Co(acac)2 that are sources of halomethyl radicals under mild experimental conditions. The efficiency of these novel organocobalt complexes for the precision synthesis of end-functional and telechelic polymers will be described. Also, the solubility of these complexes in water enables the facile production of end-functionalized water soluble poly(ionic liquid)s. Further derivatizations of the halomethyl group at the chain-end of polymers produced by this system will be demonstrated by click reaction, largely broadening the range of possible functional groups. Finally, besides numerous applications in macromolecular engineering, this unexplored family of R-Co presents a high potential in radical reactions in organic synthesis by the facile production of halomethyl radicals. [less ▲]

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See detailA Mach-Zehnder interferometer based on orbital angular momentum for improved vortex coronagraph efficiency
Piron, Pierre ULg; Delacroix, Christian; Huby, Elsa ULg et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VII (2015, September 11)

The Annular Groove Phase Mask (AGPM) is a vectorial vortex phase mask. It acts as a half-wave plate with a radial fast axis orientation operating in the mid infrared domain. When placed at the focus of a ... [more ▼]

The Annular Groove Phase Mask (AGPM) is a vectorial vortex phase mask. It acts as a half-wave plate with a radial fast axis orientation operating in the mid infrared domain. When placed at the focus of a telescope element provides a continuous helical phase ramp for an on axis sources, which creates the orbital angular momentum. Thanks to that phase, the intensity of the central source is canceled by a down-stream pupil stop, while the off axis sources are not affected. However due to experimental conditions the nulling is hardly perfect. To improve the null, a Mach-Zehnder interferometer containing Dove prisms differently oriented can be proposed to sort out light based on its orbital angular momentum (OAM). Thanks to the differential rotation of the beam, a π phase shift is achieved for the on axis light affected by a non zero OAM. Therefore the contrast between the star and its faint companion is enhanced. Nevertheless, due the Dove prisms birefringence, the performance of the interferometer is relatively poor. To solve this problem, we propose to add a birefringent wave-plate in each arm to compensate this birefringence. In this paper, we will develop the mathematical model of the wave front using the Jones formalism. The performance of the interferometer is at first computed for the simple version without the birefringent plate. Then the effect of the birefringent plate is be mathematically described and the performance is re-computed. [less ▲]

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See detailNumerical crashworthiness analysis of an offshore wind turbine monopile impacted by a ship
Bela, Andreea ULg

Conference (2015, September 11)

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See detailIntercalation of imidazolium end-functionalized polyphosphates between montmorillonite nanosheets towards flame-retardant
Carion, Stéphan ULg; Lecomte, Philippe ULg; Thomassin, Jean-Michel ULg et al

Poster (2015, September 11)

Among the additives used to impart flame-retardant properties to polymer materials, phosphorous additives and nanoclays are widely used. The aim of this work is to associate both additives to bring about ... [more ▼]

Among the additives used to impart flame-retardant properties to polymer materials, phosphorous additives and nanoclays are widely used. The aim of this work is to associate both additives to bring about a synergetic effect for improving the flame-retardancy of the material (1). In a first step, the synthesis of an aliphatic polyphosphate end-capped by an imidazolium cation is reported. Secondly, this polymer is intercalated between montmorillonite nanoclays. The strategy used for the synthesis of the polyphosphate is based on the ring-opening polymerization of the corresponding cyclic phosphate by using 1-(11-hydroxy-undecyl)-3-methylimidazolium bromide as an initiator. This polymerization was catalyzed by DBU and a thiourea derivative (2). This polymer was characterized by a set of techniques (31P and 1H NMR, SEC, TGA, DSC). Finally, the cationic end-functionalized polymer was exchanged with sodium cations present in montmorillonite. The intercalation of the polyphosphate between the clay nanosheets was proved by X-Ray Diffraction (XRD) and thermogravimetric analysis (TGA). This last technique was also used to determine the influence of the intercalation on the thermal stability of the polyphosphate. [less ▲]

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See detailL'utilisation des insectes dans la pharmacopée de l'Égypte gréco-romaine
Marganne, Marie-Hélène ULg

Conference (2015, September 11)

Telles qu'on peut les déchiffrer dans les papyrus littéraires grecs retrouvés en Égypte (IV/IIIe siècles avant notre ère – VI/VIIe siècles de notre ère), les prescriptions médicales recourent-elles à des ... [more ▼]

Telles qu'on peut les déchiffrer dans les papyrus littéraires grecs retrouvés en Égypte (IV/IIIe siècles avant notre ère – VI/VIIe siècles de notre ère), les prescriptions médicales recourent-elles à des insectes et, si tel est le cas, à quelle(s) variété(s), en raison de quelle(s) propriété(s) et pour quel(s) type(s) d'affections ? C'est à ces questions que l'on tentera de répondre, en complétant le témoignage des sources papyrologiques par celui des sources littéraires grecques et latines sur la pharmacopée de l'Égypte gréco-romaine. [less ▲]

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See detailNew efficient organocatalytic system for solvent-free chemical fixation of CO2 into epoxides
Panchireddy, Satyannarayana ULg; Gennen, Sandro ULg; Alves, Margot ULg et al

Poster (2015, September 11)

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and ... [more ▼]

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and industrial fields. To date, the chemical fixation of CO2 onto epoxides with the formation of cyclic carbonates (CC) is one of the most promising ways to valorise CO2 at an industrial scale. Indeed, CC are useful monomers for polycarbonate synthesis and they can react with primary amines to produce 2-hydroxyethylurethane. This reaction can be extrapolated to the synthesis of non-isocyanate polyurethanes (NIPUs) by a step growth polymerization between bifunctional CC and diamines. [less ▲]

Detailed reference viewed: 91 (9 ULg)
Peer Reviewed
See detailPredator cues and risky habitats affect foraging activity in salamanders
Melotto, Andrea; Ficetola, Gentile Francesco; Denoël, Mathieu ULg et al

Conference (2015, September 11)

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Peer Reviewed
See detailCe que l'image fait à l'histoire
Havelange, Carl ULg

Conference (2015, September 11)

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Peer Reviewed
See detailWill Big Data Deliver its Promised Productivity Growth?
Artige, Lionel ULg

Conference (2015, September 11)

Detailed reference viewed: 30 (0 ULg)
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See detailOptimized focal and pupil plane masks for vortex coronagraphs on telescopes with obstructed apertures
Ruane, Garreth; Absil, Olivier ULg; Huby, Elsa ULg et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VII (2015, September 11)

We present methods for optimizing pupil and focal plane optical elements that improve the performance of vortex coronagraphs on telescopes with obstructed or segmented apertures. Phase-only and complex ... [more ▼]

We present methods for optimizing pupil and focal plane optical elements that improve the performance of vortex coronagraphs on telescopes with obstructed or segmented apertures. Phase-only and complex masks are designed for the entrance pupil, focal plane, and the plane of the Lyot stop. Optimal masks are obtained using both analytical and numerical methods. The latter makes use of an iterative error reduction algorithm to calculate "correcting" optics that mitigate unwanted diffraction from aperture obstructions. We analyze the achieved performance in terms of starlight suppression, contrast, off-axis image quality, and chromatic dependence. Manufacturing considerations and sensitivity to aberrations are also discussed. This work provides a path to joint optimization of multiple coronagraph planes to maximize sensitivity to exoplanets and other faint companions. [less ▲]

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See detailCobalt-mediated radical polymerization for the precision design of novel poly(ionic liquid) copolymers in aqueous media
Cordella, Daniela ULg; Kermagoret, Anthony; Debuigne, Antoine ULg et al

Poster (2015, September 11)

Poly(ionic liquid)s (PILs) have emerged as a special class of polyelectrolyte materials, featuring tunable solubility, high ionic conductivity, and a broad range of glass transition temperatures. Due to ... [more ▼]

Poly(ionic liquid)s (PILs) have emerged as a special class of polyelectrolyte materials, featuring tunable solubility, high ionic conductivity, and a broad range of glass transition temperatures. Due to their specific properties emanating from the ionic liquid (IL) units and their intrinsic polymeric nature, PILs find potential applications in various areas, such as analytical chemistry, biotechnology, gas separation, dispersants, solid ionic conductors for energy, catalysis, etc. In recent years, controlled radical polymerization (CRP) techniques have been applied to the synthesis of structurally well-defined PILs, with control attained over molar mass, dispersity, and end-group fidelity. In this poster, we will report on the implementation of cobalt-mediated radical polymerization (CMRP) technique for the precision synthesis of unprecedented PILs (co)polymers. We will discuss how an organocobalt complex can efficiently control the growth of vinyl imidazolium chains and lead to PILs with predicted molar masses and low polydispersities under mild experimental conditions, thus at low temperature and using water as a green polymerization medium. The huge potential of this system will be highlighted by describing the one-pot synthesis of all vinyl imidazolium-based block copolymers in aqueous media. This CMRP is unique for providing well-defined vinyl imidazolium based-copolymers for advanced PILs applications. [less ▲]

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See detailTentativi di avvicinamento a Il figlio di Bakunìn (1991) di Sergio Atzeni (1952-1995)
Curreri, Luciano ULg

Conference (2015, September 11)

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See detailChallenges for Scale-Up of Batch Phase Separation
Pfennig, Andreas ULg; Becker, Karsten; Bach, S. et al

Conference (2015, September 10)

Detailed reference viewed: 38 (2 ULg)
See detail1. Actualités en ravageurs - 2. Variétés résistantes à la cécidomyie orange du blé : intérêt agronomique et méthode de caractérisation
Chavalle, Sandrine ULg; Jacquemin, Guillaume; De Proft, Michel

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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Peer Reviewed
See detailNewts skip aquatic life and forego reproduction in response to alien fish introduction
Winandy, Laurane ULg; Darnet, Elodie; Denoël, Mathieu ULg

Conference (2015, September 10)

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See detail1. Actualités en ravageurs - 1. Saison 2015 : attaque et dégâts de cécidomyie orange du blé
Hautier, Louis; Chavalle, Sandrine ULg; De Proft, Michel

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailNumerical simulations on embedded solids : integration of CAD and eXtended Finite Element Analysis
Duboeuf, Frédéric ULg; Béchet, Eric ULg

Conference (2015, September 10)

The aim of this communication is to propose a procedure in order to dissociate the geometric description of the field’s approximation within the extended finite element method (X-FEM) and with non ... [more ▼]

The aim of this communication is to propose a procedure in order to dissociate the geometric description of the field’s approximation within the extended finite element method (X-FEM) and with non-matching meshes. Implicit and explicit approaches are combined in order to represent with accuracy all the CAD entities regardless of their dimension. The choice of appropriate tools such as Level Sets technique allows to describe evolving interfaces with great flexibility. The design of a dedicated P1 functional space is achieved by decimating the traces of standard finite element (FE) shape functions, thanks to a new algorithm, especially when the problem domain is embedded in a space of a higher dimension. An analysis of the approximation properties of the P1 FE trace spaces on hyper-surfaces is available in the literature and applied for solving PDEs on closed surfaces without boundary. Dirichlet boundary conditions are applied using a convenient choice of stable Lagrange multiplier space, according to a new generalized algorithm. That extends the existing solutions to every combination of the space domain and boundary dimensions. In terms of solvers, the introduction of double Lagrange multipliers can be used to recover the positive definiteness of the bilinear form. This approach allows to treat any embedding, i.e. 1, 2, or 3D problems embedded in 2 or 3D background meshes. The possibility of applying the methodology to beams is investigated, with a potential application to through-thickness reinforced composites in a mixed-dimensional modelling framework. [less ▲]

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See detailDegradation of p-nitrophenol and bacteria with TiO2 xerogels sensitized in situ with tetra(4-carboxyphenyl)porphyrins
Tasseroul, Ludivine ULg; Lambert, Stéphanie ULg; Eskenazi, David et al

Poster (2015, September 10)

Heterogeneous photocatalysis is widely studied for environmental applications as oxidative processes can completely destroy organic pollutants such as alkanes, pesticides, dyes, etc. and microorganisms ... [more ▼]

Heterogeneous photocatalysis is widely studied for environmental applications as oxidative processes can completely destroy organic pollutants such as alkanes, pesticides, dyes, etc. and microorganisms. The most used photocatalyst is the commercial TiO2 Degussa P25, which is composed of 80% anatase and 20% rutile and which is active when TiO2 is exposed to UV light ( < 380 nm). Recently, several studies have been performed to extend the light absorption range of TiO2 towards the visible range. In this study, TiO2-based materials doped with porphyrins, a widely used dye for the photosensibilization of TiO2, have been prepared using a sol-gel process. To stabilize the TiO2-dye interactions, free metal tetra(4-carboxyphenyl)porphyrin and nickel tetra(4-carboxyphenyl)porphyrin were introduced in situ into the TiO2 matrix during the sol-gel process rather than by grafting. Samples were thoroughly characterized by TEM, X-ray diffraction, FT-IR, DR-UV/Vis and their texture has been examined by nitrogen adsorption–desorption at 77 K. The photocatalytic activity for the degradation of p-nitrophenol and Escherichia coli and Lactobacillus rhamnosus bacteria cells in aqueous medium, under halogen lamp light have been evaluated in relation with the physico-chemical modifications induced by the doping. The low temperature vacuum drying protocol (150°C) used in the present study enabled to obtain porphyrin doped TiO2 xerogels with a high specific surface area, and containing nanoparticles composed of amorphous- and anatase-TiO2. Diffuse reflectance spectroscopy attest the presence of TCPPH2 and TCPPNi within the TiO2 matrix. In a first step, the photoactivity of the xerogels is tested for p-nitrophenol degradation. Results show that crystallinity and nature and concentration of porphyrin introduced in situ have major impact on the degradation performances. In a second step, the best xerogel for p-nitrophenol degradation has been used to degrade bacteria. This xerogel degrades E. coli and L. rhamnosus bacteria cells in less than 48 and 24 h respectively. The photocatalytic degradation of a pollutant is thus correlated to the degradation of bacteria since a xerogel doped with the TCPPNi degrades both p-nitrophenol, E. coli and L. rhamnosus. [less ▲]

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See detail6. Protection intégrée des semis et des jeunes emblavures
Henriet, François; Chavalle, Sandrine ULg; Bataille, Charlotte et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailOsteopontin as a new target in glioblastoma progression and resistance to radiotherapy
Henry, Aurélie ULg; Bellahcene, Akeila ULg; Castronovo, Vincenzo ULg et al

Conference (2015, September 10)

Glioblastoma (GBM) is the most aggressive and common solid human brain tumor. Because of GBM heterogeneity, location and aggressiveness, none of the available treatment is curative. These treatments ... [more ▼]

Glioblastoma (GBM) is the most aggressive and common solid human brain tumor. Because of GBM heterogeneity, location and aggressiveness, none of the available treatment is curative. These treatments include maximal surgical resection, radiotherapy and concomitant or adjuvant chemotherapy with Temozolomide (TMZ). However, the prognosis of adult patients with GBM remains poor and the survival outcome after treatment does not exceed 15 months. Glioblastoma-composing cells have developed many strategies to counteract these current therapies. Among the wide hallmarks acquired to survive, osteopontin (OPN) ranks correlates with lower overall and disease-free/relapse-free survival in all tumors combined, as well in brain cancer. OPN expression is largely considered as a molecular cancer marker associated with poor prognosis for patients with cancer. Our preliminary works (Lamour V and Henry A, IJC 2015) have demonstrated the role of OPN in the tumorigenicity of glioblastoma cells and its importance in the maintenance of the stem charachters. Within the continuance of this work, our recent studies focused on the potential role of OPN in the resistance of glioblastoma cells to radiotherapy and its implication in the initiation of Double Strand Breaks (DSBs) repair mechanism. In this context, U251-MG and U87-MG cells were used to assess the role of OPN in the initiation of the DSBs repair mechanism after an exposure to gamma-irradiation (γ–IR). The transient transfection of both cell lines with siRNA directed against OPN shown a lower induction of γ–H2AX compared to control (irrelevant siRNA). The survival of U251-OPN depleted cells was also affected after an exposure to γ–IR (based on clonogenic assays). However, the sole depletion of OPN in U87 cells affected their survival (independently of the γ–IR). To prove that the secreted form of OPN is necessary to survive after γ–IR, conditionned medium of U87-shSCR clones (rich in OPN) was used to treat U87shOPN clones before an exposure to γ–IR. By immunofluorescence, we observed that the γ–H2AX staining was higher in U87 shOPN clones than when treated with their own conditionned medium (poor in OPN). Currently, we are investigating the in vivo implication of OPN in the initiation of DSBs repair mechanism after an exposure of mice to γ–IR (whole brain exposure). For this purpose, IPTG-inducible U87 shRNA clones (SCR and OPN) have been generated and validated for an orthotopic xenograft model in NOD-SCID mice. The survival after a radiotherapy of 10 Gy (2Gy per day for 5 days) will be assessed in OPN-positive and –negative tumor-bearing mice. Taken together, these datas suggest that OPN could represent an important pronostic factor for patient response to radiotherapy in the context of GBM. [less ▲]

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See detail3. Variétés - 2. Escourgeon et orge d'hiver fourragers
Monfort, Bruno; Mahieu, Olivier; Jacquemin, Guillaume et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailLivre Blanc Céréales
Sinnaeve, Georges; Gofflot, S.; Chandelier, anne et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailDéception et incertitude en démocratie
Jamin, Jérôme ULg

Conference (2015, September 10)

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See detail3. Variétés - 1. Froment d'hiver
Meza Morales, Walter ULg; Eylenbosch, Damien ULg; Jacquemin, Guillaume et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detail2. Implantation des cultures
Eylenbosch, Damien ULg; Meza Morales, Walter ULg; Monfort, Bruno et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailDesign of the superconducting end caps of a tubular magnetic shield.
Wera, Laurent ULg; Fagnard, Jean-François ULg; Hogan, Kevin ULg et al

Poster (2015, September 09)

Shielding a sensitive device against DC or AC stray magnetic fields can be realized very efficiently with high-Tc superconductors. A simple magnetic shield can be obtained with a tube enclosing the device ... [more ▼]

Shielding a sensitive device against DC or AC stray magnetic fields can be realized very efficiently with high-Tc superconductors. A simple magnetic shield can be obtained with a tube enclosing the device, which is protected against external fields until the magnetic flux diffuses either across the tube wall or through the end openings. A better shielding vessel is obtained by using superconducting end caps. In the simplest design, the end caps, consisting of superconducting disks placed at the extremities of the tube, are making a 90 degree angle with the tube wall. Because of demagnetization effects, this arrangement results in a 'weak spot' for the penetrating magnetic flux. In this work, we investigate numerically different shapes for the end caps so as to avoid sharp angles and obtain a smoother magnetic flux penetration. The external magnetic induction is applied parallel to the shield axis. The magnetic flux distribution and the shielding currents are calculated with a finite element approach. The shielded volume is defined as the region where the local magnetic flux density is attenuated below a given fraction of the external field. It is studied as a function of the shape of the cap, its superconducting properties, the aspect ratio of the assembly, and the presence of a cabling hole. Curved and elongated caps, which could in principle be obtained by melt cast processing or different coating techniques, are shown to substantially increase the shielded volume. [less ▲]

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See detailUn musée du Moyen Age à Namur
George, Philippe ULg

Conference (2015, September 09)

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See detailMagnetic shielding properties of a bulk Bi-2223 superconducting hollow cylinder subjected to the magnetic stray field of a nearby magnetic source
Hogan, Kevin ULg; Wera, Laurent ULg; Fagnard, Jean-François ULg et al

Poster (2015, September 09)

Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. At low frequencies, their efficiency even surpasses that of conventional ferromagnetic materials ... [more ▼]

Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. At low frequencies, their efficiency even surpasses that of conventional ferromagnetic materials. Therefore, they can be very useful for many applications which require low or very low magnetic field in intense quasi-static magnetic environments. The vast majority of studies on superconducting screens has been conducted in homogeneous magnetic field configurations. Few works have been done concerning inhomogeneous magnetic field configurations while those are representative of practical situations. Moreover, those configurations are non-trivial given the magnetic hysteretic behaviour of type-II superconductors. In the present work, we aim at investigating and understanding the shielding properties of a superconducting hollow cylinder made of Bi-2223 subjected to the magnetic stray field of a coil placed in the vicinity. All experiments are carried out at 77K. [less ▲]

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See detailWhat do they mean? Listening to babies communicating in the daily setting in ECEC service
Pirard, Florence ULg; Legrand, Anne; Michel, Aurore ULg

Conference (2015, September 09)

The main aim of the study was to gain understanding of how babies communicate in ECEC services. Previous literature indicates that babies can interact and communicate precociously, not only with adults ... [more ▼]

The main aim of the study was to gain understanding of how babies communicate in ECEC services. Previous literature indicates that babies can interact and communicate precociously, not only with adults (Stern, 2005; Threvarten, 2011), but also with other children (Tomasello et al., 2005). The ECEC service can be considered as a setting where interaction and communication between peers can be sustained by practitioners who observe them, document what happens, analyse together the educational condition to guarantee and regulate their action (Stambak et al., 1983). The study involved qualitative and action research initiated by Cresas and IEDPE (self-regulating participatory assessment, Ballion et al., 1988), combined with an analysis of activity approach focused on contextualised process. An action researcher has gathered practitioners, trainers and researchers from France, Spain, Croatia, Italy and Belgium to analyse educational daily practice in ECEC services and their effect on communication between peers. Videos have been used to document and analyse the practice (EADAP, 2011). The ethical considerations taken in this study involved collaborative perspectives that give an active place to all participants (researchers, trainers, practitioners? parents and children). Informed consent and authorization for using video in the research are guaranteed. Participants identify and document communication processes between very young children observed in natural setting (ECEC services). These processes are characterised by several aspects: duration, emotional expression and meaningful linking of observed behaviours between babies. A shared meaning from the video documentation can be co-constructed like some narrative stories. Participants consider the activity of babies as meaningful stories that they should understand and sustain with interest. We discuss implications for professionalisation of the workforce (initial training and professional development). [less ▲]

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See detailCharacterization of the magnetic properties of a continuously coated YBCO coated conductor cylinder in persistent current mode
Wera, Laurent ULg; Fagnard, Jean-François ULg; Hogan, Kevin ULg et al

Poster (2015, September 09)

YBCO coated conductors are good candidates for magnetic shielding applications because of (i) their high current density and (ii) their lower weight compared to magnetic shields made of bulk HTS materials ... [more ▼]

YBCO coated conductors are good candidates for magnetic shielding applications because of (i) their high current density and (ii) their lower weight compared to magnetic shields made of bulk HTS materials. In particular, an efficient superconducting magnetic shield can be built as an assembly of milled YBCO 2G coated conductor tape sections, or, as in this case, a continuously coated cylinder. The purpose of the present work is to characterize experimentally the DC magnetic properties of a continuous band of YBCO film (about 1 cm width) deposited around a hastelloy cylinder of 6.4 cm in diameter. In particular, we characterize the distribution and the time dependence of the trapped field inside the cylinder due to persistent current loops. We also investigate the magnetic shielding properties at several sweep rates when the applied magnetic field is parallel to the main axis of the cylinder. All measurements are carried out at 77 K. The measurement of the trapped field of the cylinder gives evidence that a persistent current of about 80 A can be induced in the YBCO band. Magnetic shielding measurements show that, thanks to the persistent current flowing in the band, the cylinder is able to attenuate by a factor of 2 the applied magnetic field. These results open interesting perspectives for a further development of magnetic shields made of coated conductor cylinders. We investigate how the shielding performances could be further improved by increasing the number of layers and by increasing the height of the cylinder. The results are compared to a multilayer coated conductor cylinder with joints and to persistent current loops obtained with milled coated conductor tape sections. [less ▲]

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See detailStudy of the impact of school average ability on career expectations
Dupont, Virginie ULg

Conference (2015, September 09)

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See detailReevaluating IUCN Red List assesment on European amphibians
Crnobrnja-Isailović, Jelka; Cogalniceanu, Dan; Denoël, Mathieu ULg et al

Conference (2015, September 09)

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See detailStraw-bale walls for sustainable architecture: Improving and promoting straw-bale use in European Buildings
Evrard, Arnaud; Biot, Benjamin; Keutgen, Gauthier et al

in Cucinella; Giulia (Eds.) Architecture in (R)Evolution (2015, September 09)

Straw-bale use in buildings may be an interesting way to decrease our energy needs and our impact on the environment. Moreover, it fosters a local economy and the creation of new jobs in the building ... [more ▼]

Straw-bale use in buildings may be an interesting way to decrease our energy needs and our impact on the environment. Moreover, it fosters a local economy and the creation of new jobs in the building industry. Combined with earth materials and other well-selected materials and systems, it allows creative designers to integrate highly efficient, low-tech and reusable envelopes in comfortable and healthy places. The present paper summarizes the results of a four year R&D program aiming to improve and promote the use of straw bale in buildings and also to remove uncertainties concerning this use. Three main aspects are pinpointed and discussed: hygrothermal transfer and storage in straw-bale walls, regulation of indoor conditions and environmental impact in the long term. These three topics were submitted to European experts (France, England and Germany) in order to discuss a cross-comparison of results obtained on a larger scale. The paper shows that straw-bale use in buildings is a relevant and innovative solution in facing one of the major challenges of today and tomorrow: "How to build/transform comfortable and affordable buildings with local resources and with a positive impact on the environment?". [less ▲]

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See detailPractical training session on virus discovery from High Throughput Sequencing data
Massart, Sébastien ULg

Conference (2015, September 09)

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See detailA plea for the creation for inviolate areas to protect reference areas for future microbiology research in Antarctica
Wilmotte, Annick ULg; Willems, Anne; Verleyen, Elie et al

Poster (2015, September 08)

Antarctica is essentially a microbial continent. A surprisingly large biodiversity of adapted microorganisms lives permanently in various biotopes of the ice-free areas (about 44,000 km2). Based on ... [more ▼]

Antarctica is essentially a microbial continent. A surprisingly large biodiversity of adapted microorganisms lives permanently in various biotopes of the ice-free areas (about 44,000 km2). Based on molecular methods and microscopic observations, important findings like the presence of potentially endemic taxa, their survival in glacial refugia since the continent moved away from Australia and South America, and the determination of biogeographic patterns have been inferred. Moreover, Antarctic microorganisms may contain novel molecules with potentially pharmaceutical or biotechnological interest. However, microbial habitats are under pressure as a result of nthropogenic introductions. Indeed, as a consequence of human presence, non-indigenous microorganisms are released from bodies, clothing, cargo and food into the environment (Cowan et al. 2011). The increase of tourism and its diversification from coastal cruises to adventurous expeditions into the continent, as well as the increase of research stations and associated impacts, constantly create new ‘entry points‘ for microbial contamination (Chown et al. 2012). The impacts of such introductions are still unknown, and might lead to a loss of the native microbial biodiversity, or its modification by lateral gene transfer. The technical progresses in molecular methodologies, like we currently see with Next Generation Sequencing (NGS), mean that very sensitive high-throughput analyses will become increasingly accessible. They have the potential to describe the microbial communities with unprecedented details without preconceived expectations. However, by that time, we might have lost the pristine Antarctic areas that would enable the scientists to study the native microbial flora, its functioning and properties. The Protocol on Environmental Protection of the Antarctic Treaty foresees the designation of Antarctic Specially Protected Areas (ASPA) to protect “outstanding environmental, scientific, historic, aesthetic, or wilderness values, any combination of those values, or on- going or planned scientific research” (http://www.ats.aq/e/ep_protected.htm). However, the designation of ASPAs has not followed a systematic planning, and often focused on the conservation of large animals or higher plant communities. Microorganisms have the handicap of generally being invisible without a microscope and relevant expertise, and needing molecular methods to determine their identity. Terrestrial habitats are protected in 55 out of the 72 existing ASPAs (in total less than 700 km2), mostly based on the need to protect vascular plants and bryophyte communities (Shaw et al. 2014). In 28 ASPAs, the protection targets the lichens, whereas microalgae are protected in 16 ASPAs, cyanobacteria in 7 and snow microalgae in 3. Only 8 ASPAs mention ‘Microbial habitats’, ‘microbial communities’ or ‘soil and lake microflora’. One tool of the Protocol that could be specifically used to protect microbial habitats is the creation of inviolate areas where no visitation is permitted (inside ASPAs, for example). These zones could be set aside for future research (Hughes et al. 2013) and become extremely valuable. After a few decades, they would be unique examples of truly pristine habitats, representative of the native microbial diversity and processes. Such an option would necessitate discussions and consensus with scientists of other disciplines to select these regions, and careful management protocols of the sites and their vicinity (Hughes et al. 2015). In addition, gaps in knowledge should be addressed, like the extent of transportation of microorganisms by natural means (winds, birds...) (e.g. Pearce et al. 2009), and the probability of subsequent colonization of new areas by microorganisms coming from other Antarctic regions or from outside Antarctica. Let’s hope that the dialogue between scientists and policy makers will enable to improve the conservation of Antarctic microbial diversity and safeguard the possibility to study these unique communities in the future with the most advanced techniques of the time. The outcome of these discussions might also be of interest for Arctic and alpine regions. [less ▲]

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See detailComparison of 3 diffractive IOLs: one monofocal (achromatic), one bifocal and one trifocal lens implant
Gatinel, Damien; Loicq, Jerôme ULg; Pagnoule, Christophe et al

Conference (2015, September 08)

Purpose: To describe the optical performance of 3 types (monofocal, bifocal and trifocal) of diffractive hydrophobic intraocular lenses (IOLs). Setting: Fondation Rothschild, Paris, France Methods: An ... [more ▼]

Purpose: To describe the optical performance of 3 types (monofocal, bifocal and trifocal) of diffractive hydrophobic intraocular lenses (IOLs). Setting: Fondation Rothschild, Paris, France Methods: An achromatic monofocal, a bifocal and trifocal diffractive IOLs were measured with an optical bench, designed to measure Modulation transfer function (MTF) and point spread function (PSF) of diffractive intraocular lenses. The measurements were performed at 3 wavelengths (480 nm, 546 nm and 650 nm), using an aberration free cornea and an aspherical artificial cornea generating a +0.28 µm of positive spherical aberration (ISO 11979-2 guideline). The through-focus MTF was recorded with the 3 IOLs for various pupil apertures. The evaluation of the magnitude of the halos was performed from PSF measurement obtained at each focal spot location. Results: The monofocal and the two bifocal IOLs were presenting 2 peaks on the through-focus MTF in the green: for intermediate vision (at 1.75D) for the monofocal achromatic lens, and for far and for near vision( at +4D) for the bifocal IOL of the same material. Three peaks were recorded with the trifocal IOL at any wavelength. The achromatic monofocal was monofocal for far in the red and monofocal for near in the blue. The amount of energy allocated to each focal point was not very different for the three IOLs except for smaller apertures where the distance vision with the trifocal IOL had a significant lower peak than the two other IOLs. The amount of halos were comparable between lenses. Conclusions: The diffractive and refractive optics generated opposite chromatic aberration. A achromatic diffractive IOL behaves like a bifocal IOL with an intermediate addition The bifocal and trifocal IOL induce similar chromatic effects for the near (bifocal, trifocal) and intermediate (trifocal) foci. The tested diffractive patterns wee not efficient to correct the chromatic aberration at the distance foci for all tested IOLs. [less ▲]

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See detailA wavelet-based mode decomposition compared to the EMD
Deliège, Adrien ULg; Nicolay, Samuel ULg

Poster (2015, September 08)

We introduce a new method based on wavelets for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the "classic" wavelet ... [more ▼]

We introduce a new method based on wavelets for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the "classic" wavelet-based decomposition and the empirical mode decomposition (EMD). We compare the efficiency of the method with the well-established EMD on toys examples and the ENSO climate index. [less ▲]

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See detailL’image dans le concours d’architecture : Méthodologie de lecture de la représentation graphique du projet
Boutemadja, Abdelkader ULg; Reiter, Sigrid ULg

in AISV 2015 (2015, September 08)

Nous assistons depuis quelques décennies au développement de nouveaux modes de production des représentations graphiques en architecture. Ces développements ont des raisons multiples mais la principale ... [more ▼]

Nous assistons depuis quelques décennies au développement de nouveaux modes de production des représentations graphiques en architecture. Ces développements ont des raisons multiples mais la principale semble être l’essor qu’a connu l’usage de l’outil informatique dans nos sociétés de manière générale mais aussi dans les domaines de liés à l’édification dont l’architecture et l’urbanisme. Le recours aux images 3D assistées par ordinateur est aussi apparu très tôt surtout dans le cadre des concours d’architecture. Pour produire les images les plus séduisantes, les logiciels d’architecture et d’urbanisme (DAO, CAO, BIM, SIG, …) sont devenus de plus en plus performants et intuitifs. Dans le cadre plus particulier des concours d’architecture, cette utilisation de l’outil informatique et des nouveaux modes de représentation graphique se trouve exacerbée. Chaque concours devient d’occasion, pour les architectes qui y participent, de recherche et d’innovation – non seulement architecturale – mais aussi dans la manière de représenter et de communiquer cette architecture. Qu’elles sont les nouvelles stratégies de communication portées par les représentations graphiques du projet que l’architecte cherche à mettre en place dans un concours d’architecture ? Existe-t-il une logique commune, liée aux nouveaux modes de production, à ces stratégies de communication du projet ? Ces nouvelles typologies de représentation graphique ont elles une influence sur les typologies architecturales produites, plus particulièrement dans les concours d’architecture ? Ce sont ici les questions principales que nous nous posons et auxquelles nous cherchons à répondre au travers de cet article. [less ▲]

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See detailSocial Enterprise Models in a worldwide Comparative Perspective
Defourny, Jacques ULg

Conference (2015, September 08)

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See detailProperties of a new hydrophobic diffractive trifocal intraocular lens: linear chromatic aberrations (LCA) by optical simulation and optical bench testing
Loicq, Jerôme ULg; Gatinel, Damien

Conference (2015, September 08)

Purpose: Impact of the IOL raw material Abbe number on diffractive trifocal optical outcomes in terms of light energy partition between the three foci, modulation transfer function (MTF) and linear ... [more ▼]

Purpose: Impact of the IOL raw material Abbe number on diffractive trifocal optical outcomes in terms of light energy partition between the three foci, modulation transfer function (MTF) and linear chromatic aberration (LCA). Setting: Space Center Liège (Centre Spatial de Liège), University of Liège, Liège, Belgium Methods: The difference between hydrophilic and hydrophobic materials doesn't rely on biocompatibility only, but also influence some optical properties. In order to highlight the impact of the raw material associated to Diffractive-Trifocal-IOLs, we compare certain optical properties of two Diffractive-Trifocal-IOLs associated to Physiol's Trifocal-technology and made of 26% hydrophilic and hydrophobic GF raw material. The Abbe number of the two IOL materials was measured with a refractometer. The through focus MTF curves at 3 wavelengths (480, 546 and 650 nm) and different apertures were generated by simulation in an Arizona eye model and compared with results on a PMTF optical bench. Results: The through focus MTF curves at the three wavelengths shows that the diffracted light for the near vision (+3.5 D) by the trifocal optic generates chromatic aberrations of opposite sign with respect to the refracted light assigned to the Far vision. The diffracted light at the origin of the Intermediate vision (+1.75 D) does not show significant amount of LCA and can be considered as a chromatic aberration free focus. Results are similar for the two lens materials. Conclusions: Diffractive Trifocal IOLs show chromatic aberrations whose sign and amplitude depend on the add-power of the different foci (far, near or intermediate), but is basically independent of the nature of the type of raw material, hydrophilic or hydrophobic. [less ▲]

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See detailEthylene polymerization mediated by nickel(II) covalently anchored to silica xerogels
Lambert, Stéphanie ULg; Sacco, Luigi

Conference (2015, September 08)

Heterogeneous catalysis is generally widely preferred for industrial applications thanks to the well-known advantages of easier product-catalyst separation and recovery of the catalyst process and, often ... [more ▼]

Heterogeneous catalysis is generally widely preferred for industrial applications thanks to the well-known advantages of easier product-catalyst separation and recovery of the catalyst process and, often, to the enhanced stability of the catalyst. But in terms of selectivity, homogeneous catalysis usually provides better results. From this point of view, the grafting of homogeneous catalysts onto a solid support seems the ideal combination in order to achieve the advantages of both heterogeneous and homogeneous catalysis, allowing the developing of more environmentally friendly and economical processes with potential application in the industry. Further, to covalently link a homogeneous onto silica (a support which is thermally, chemically and mechanically resistant, with a well defined structure) is the best way to limit metal leaching and sintering. Nitrogen-based ligands containing one of several Schiff bases have been reported to form active catalysts with “late-metal” (such as Fe, Pd, Ni,…) for the ethylene polymerization [1]. Moreover, substituted pyrazole-based organometallic complexes gave also promising results in this field. These facts let us suggest that the pyrazolylpyridine derivatives bearing a tethered trimethoxysilylated group synthesized in a previous work [2] are potentially good candidate to prepare hybrid catalyst (i.e. soluble organometallic complexes covalently bonded onto an insoluble support, in this case silica) with Ni-II, Fe-II or Pd-II for ethylene polymerization. [less ▲]

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See detailYear Round Survey of Ocean-Sea Ice-Air Exchanges – the YROSIAE survey
Delille, Bruno ULg; Van Der Linden, Fanny ULg; Fripiat, François et al

Poster (2015, September 08)

YROSIAE survey aimed to carry out a year-round integrated survey of land-fast sea ice focusing on the study of sea ice physics and biogeochemistry in order to a) better understand and budget exchanges of ... [more ▼]

YROSIAE survey aimed to carry out a year-round integrated survey of land-fast sea ice focusing on the study of sea ice physics and biogeochemistry in order to a) better understand and budget exchanges of energy and matter across the ocean-sea ice-atmosphere interfaces during sea ice growth and decay and b) quantify their potential impact on fluxes of climate gases (CO2, DMS, CH4, N2O) to the atmosphere and on carbon and macro- nutrients and micro-nutrients export to the ocean. We will present the aims, overall approach and integrated sampling strategy of the YROSIAE survey. We will also discuss CO2 and N2O dynamics within sea ice. It appears that sea ice acts as a source of CO2 for the atmosphere in winter, counterbalancing spring sink. In addition, mineralization in spring appears to alleviate spring CO2 uptake. Intense nitrification in sea ice in spring fosters emission of N2O at the air-ice interface. [less ▲]

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See detailThe leaders profile method: detection of distinct processes in a signal
Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Poster (2015, September 08)

The leaders profile method is a multifractal formalism that allows to compute non-concave and non-increasing spectra. Our implementation can detect the presence of distinct processes in a signal. We ... [more ▼]

The leaders profile method is a multifractal formalism that allows to compute non-concave and non-increasing spectra. Our implementation can detect the presence of distinct processes in a signal. We present here the first results obtained. [less ▲]

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See detailAssessing electrical resistivity tomography for hydrofacies detection using a sensitivity dependent probabilistic methodology
Hermans, Thomas ULg; Irving, James

in EarthDoc - Near Surface Geosciences 2015 (2015, September 08)

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may ... [more ▼]

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may provide important information on the spatial distribution of hydrogeological parameters. However, ERT inversion introduces some bias in the resulting resistivity distribution due to regularization and resolution issues. In this study, we refine ERT inversions by incorporating prior information in order to improve the identification of facies through a probabilistic relationship derived from collocated measurements. We then analyze with synthetic cases the effect of spatially varying sensitivity on the probabilistic relationship. As expected, when sensitivity decreases, the distributions of resistivity for the different facies tend to be superimposed. A mean distribution thus overestimates the ability of surface ERT to discriminate hydrofacies in depth. [less ▲]

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See detailPremières notes pour l'ethnographie d'un projet européen en situation embarquée
Thoreau, François ULg

Conference (2015, September 08)

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See detailIconic virtues of diagrams. Peirce and ampliative reasoning
Leclercq, Bruno ULg

Conference (2015, September 08)

In his Critic of pure reason, Immanuel Kant notoriously claimed that, being grounded on the forms of sense intuition, arithmetical and geometrical propositions are both synthetic (i.e. informative) and a ... [more ▼]

In his Critic of pure reason, Immanuel Kant notoriously claimed that, being grounded on the forms of sense intuition, arithmetical and geometrical propositions are both synthetic (i.e. informative) and a priori. Bernard Bolzano, followed in this by the logicist movement (from Gottlob Frege to Rudolf Carnap), answered that the generality and necessity of mathematical propositions and proofs can only be grounded on conceptual analysis. Even though, just like Frege, he is one of the fathers of formal logic, Charles Sanders Peirce provides some semiotic reasons to think that Kant was right: diagrams do convey general meanings and provide some knowledge which is necessary yet non-trivial. Unlike logical analysis, visual presentation of concepts in schemas or diagrams helps to explore concepts by stressing some of their “side” features in such a way that new knowledge is gained: « diagrams evolve what was involved » (CP4/86). This is why, according to Kant’s notion of intuitive construction, mathematical inferences are not merely deductive but are inventive and ampliative. My talk aims at identifying some iconic virtues of diagrams which, according to Peirce, explain their epistemic productivity. A first one lies in the “formal” nature of icons, which allows them to express syntactic relations between descriptive (symbols) and demonstrative (indices) components of structured information. On this respect, even algebraic and ideographic expressions are icons exhibiting a general form – a “rheme” – in which places for indices are filled with variables “x” and “y” meaning “any individual”. For this reason, even though they are singular, diagrams are “abstractions” in the sense that they represent relations rather than their terms. Only with this in prospect can a second, and more studied, feature of diagrams matter, namely their two-dimensionality, which helps to exhibit complex relations that cannot be seen on linear linguistic expressions. Finally, a third feature of diagrams lies in their imaginary rather than referential character. Icons connote without denoting, and therefore they can be informational without this information being limited to singular individuals. Furthermore, this non referential character of icons is what makes them open to virtual exploratory manipulations that allow to consider and investigate possibilities which in turn inform us on not obvious properties of the presently visible configuration. [less ▲]

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See detailThe BCCM/ULC culture collection to conserve, document and explore the polar cyanobacterial diversity
Wilmotte, Annick ULg; Renard, Marine ULg; Kleinteich, Julia et al

Poster (2015, September 07)

In Polar Regions, Cyanobacteria represent key primary producers and are the main drivers of the food webs in a wide range of aquatic to terrestrial habitats. For example, they form benthic microbial mats ... [more ▼]

In Polar Regions, Cyanobacteria represent key primary producers and are the main drivers of the food webs in a wide range of aquatic to terrestrial habitats. For example, they form benthic microbial mats in lakes and soil crusts in terrestrial biotopes. They have adapted to their environment, and may present interesting features to survive freeze/thaw cycles, seasonally contrasted light intensities, high UV radiations, dessication and other environmental stresses. The BCCM/ULC public collection funded by the Belgian Science Policy Office since 2011 aims to gather a representative portion of the polar cyanobacterial diversity with different ecological origins (limnetic microbial mats, soil crusts, cryoconites, endoliths, etc.). The collection is available for researchers to study the taxonomy, evolution, adaptations to extreme environmental conditions, and genomic make-up. It presently includes 200 cyanobacterial strains, with 123 being of polar origin (catalogue: http://bccm.belspo.be/catalogues/ulc-catalogue-search). The morphological identification shows that the strains belong to the orders Synechococcales, Oscillatoriales, Pleurocapsales, Chroococcidiopsidales and Nostocales. The large diversity is also supported by the phylogenetic analyses based on the 16S rRNA sequences. This broad distribution makes the BCCM/ULC collection particularly interesting for phylogenomic studies. To this end, the sequencing of the complete genome of 16 selected strains is currently under way. In addition, cyanobacteria produce a wide range of secondary metabolites (e.g. alkaloides, cyclic and linear peptides, polyketides) with different bioactive potential (e.g. antibiotic, antiviral, anticancer, cytotoxic, genotoxic). Bioassays have shown antifungal activities of the cell extracts from strains Plectolyngbya hodgsonii ULC009 and Phormidium priestleyi ULC026. The potential of the polar strains to produce cyanotoxins and other secondary metabolites is currently being studied by ELISA, LC-MS and the detection of genes involved in their production. Due to the geographic isolation and the strong environmental stressors of the habitat, the exploration of these metabolites in Antarctic cyanobacterial strains seems promising for biotechnology or biomedical applications (Biondi et al. 2008). In summary, the BCCM/ULC public collection could serve as a Biological Resource Centre (OECD 2001) to conserve and document the biodiversity of polar cyanobacteria, as well as a repository for discovery of novel bioactive compounds. REFERENCES Biondi, N., Tredici, M., Taton, A., Wilmotte, A., Hodgson, D., Losi, D., & Marinelli, F. (2008) : Cyanobacteria from benthic mats of Antarctic lakes as a source of new bioactivities. Journal of Applied Microbiology, 105(1) : 105- 115 OECD (2001) Biological Resource Centres : Underpinning the Future of Life Sciences and Biotechnology. http://www.oecd.org/science/biotech/2487422.pdf [less ▲]

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See detailBrazil-EU Relations: Strategic Partner or Competitors?
Santander, Sébastian ULg

Conference (2015, September 07)

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See detailLa perte comme identité : le cas des familles post-séparation et post-divorce.
D'Amore, Salvatore ULg

Conference (2015, September 07)

Detailed reference viewed: 24 (1 ULg)
See detailBEDROCK AND BIOTIC INFLUENCE ON COMMUNITY COMPOSITION IN SOILS FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA
Tytgat, Bjorn; Verleyen, Elie; D'hondt, Sofie et al

Poster (2015, September 07)

Antarctica is a continent of extremes; the low availability of liquid water and nutrients, extreme low temperatures and seasonally variable levels of solar radiation exert high selective pressures on ... [more ▼]

Antarctica is a continent of extremes; the low availability of liquid water and nutrients, extreme low temperatures and seasonally variable levels of solar radiation exert high selective pressures on organisms. Consequently, most life forms in the scarce ice-free regions which represent less than 1% of the surface area of the continent are microbial. Despite this, terrestrial microbial communities are poorly studied and the existing data are geographically focused on McMurdo dry valleys and volcanically active regions. Nunataks, mountain tops protruding through the ice sheets, occur along much of the East Antarctic coast and in the Transantarctic Mountains. Among them, several remained ice-free during Neogene and Pleistocene ice ages and thus may have acted as important refugia for terrestrial life. Here we present the results of a broad-scale survey of microbial biodiversity of ice-free regions in the western Sør Rondane Mountains (Dronning Maud Land (DML), East Antarctica). A total of 66 samples from eight different ice-free regions were selected to represent gradients in bedrock type (gneiss or granite), the macrobiotic content (presence or absence of moss, lichen and/or arthropods) and geographic location. All samples were subjected to both genetic fingerprinting (ARISA) and second generation sequencing (Illumina MiSeq 300PE) targeting the V1 -V3 variable regions of the 16S rRNA gene. Mock communities were included to benchmark the bioinformatics pipeline. Reads were processed using Usearch (Edgar 2010), clustered based on a 97 % similarity cutoff using Uparse (Edgar 2013)and identified using the GreenGenes training set. The specific conductivity, pH, water content, and total (TC),total organic (TOC) and inorganic (IC) carbon content were determined and used as explanatory variables in direct ordination analyses of both the ARISA and the Illumina data. The Illumina sequencing resulted in ~600.000 high quality sequences divided over ~3980 OTUs in 28 phyla and 219 genera. No significant differences in richness equaling the number of OTUs after standardization for the number of sequences per samples were observed between high, medium and low TOC content classes for the sequencing data. Redundancy Analysis revealed that bedrock type (granite or gneiss), water content, specific conductance, pH and TOC significantly shaped the bacterial community composition. The ARISA dataset, despite having a lower taxonomic resolution, showed very similar patterns and relationships with environmental data, among which bedrock type remained the most important parameter in explaining differences in community structure between the samples. As the gneiss is supposedly of granite origin, differences in community structure may be related to physical differences between both bedrock types and their weathering products. Preliminary cosmogenic analysis of Pb isotopes of gravel samples indeed suggest a predominantly local origin of the material, yet mixtures with exotic material cannot be excluded in samples from gneiss outcrops. We conclude that microbial community composition is primarily driven by mineralogical characteristics of weathering products in these poorly developed soils, while biotic influences are of secondary importance. [less ▲]

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See detailBIOGEOGRAPHIC PATTERNS IN ANTARCTIC LACUSTRINE PROKARYOTES
Tytgat, Bjorn; Verleyen, Elie; Sweetlove, Maxime et al

Poster (2015, September 07)

Amplified climate change, increased human activity and the introduction of alien species likely form the biggest threat to Antarctic terrestrial ecosystems through range size expansions and contractions ... [more ▼]

Amplified climate change, increased human activity and the introduction of alien species likely form the biggest threat to Antarctic terrestrial ecosystems through range size expansions and contractions, regional extirpation and impacts on ecosystem functions. Despite their crucial role in the functioning of Antarctic terrestrial ecosystems , little is known about the present -day diversity and biogeography of microorganisms such as prokaryotes and microeukaryotes in the Antarctic Biogeographic Realm. Furthermore, identification of the key processes underlying microbial biodiversity dynamics is essential to understand and predict the consequences of global change on Antarctic lacustrine ecosystems. We analysed bacterial biodiversity in a total of 152 lacustrine microbial mat samples, distributed over the three main Biogeographic regions in the Antarctic Realm, including continental Antarctica, Maritime Antarctica and the Sub-Antarctic Islands comprising the southern Indian Ocean Province (SIOP) and the southern Pacific Ocean Province (SPOP). We targeted the V1-V3 variable regions of the 16S rRNA gene. Amplicon sequencing was done on an Illumina PE300 MiSeq. Sequences were processed using Usearch and Uparse, Mothur and custom scripts for basic parsing. An OTU cut-off was defined at 97 % sequence similarity, and sequences were mapped against a local GreenGenes database. Downstream analyses were performed using several R packages. We obtained about three million high quality sequences, with an average length of 500 bp. Sequences belonged to 8237 OTUs, and were distributed over 51 phyla and 366 genera. In addition, 649 OTUs remained unclassified at the phylum level and 6263 at the genus level. Mean OTU richness differed strongly between the four biogeographic regions. The lakes from Maritime Antarctica had a higher richness than those from Continental Antarctica. Interestingly, in sub-Antarctica OTU richness was strongly variable, with Marion Island (SIOP) having the lowest and Macquarie Island (SPOP) having on average the highest diversity of all studied regions. Multivariate Analyses showed that microbial community composition varied between biogeographic regions, with Macquarie Island being most different from the other regions. Continental Antarctica, Maritime Antarctica and the lakes from the SIOP share many OTUs, both in the case of Cyanobacteria and other bacteria, but are also characterised by a considerable number of unique OTUs. Within Antarctica, some regions harbour distinct bacterial communities such as the lakes in Schirmacher Oasis, Dronning Maud Land, and those from the eastern and western part of the Antarctic Peninsula. [less ▲]

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See detailA Stylistic Analysis of Caryl Phillips's "Made in Wales"
Tunca, Daria ULg

Conference (2015, September 07)

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See detailImmunoglobulin E enhances host resistance to venoms.
Marichal, Thomas ULg

Conference (2015, September 07)

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See detailThe 4m International Liquid Mirror Telescope
Surdej, Jean ULg

Conference (2015, September 07)

The International Liquid Mirror Telescope (ILMT) consists of a 4-m diameter zenith telescope with a liquid mirror characterized by a f/2 focal ratio. It is a collaborative project between Belgium, Canada ... [more ▼]

The International Liquid Mirror Telescope (ILMT) consists of a 4-m diameter zenith telescope with a liquid mirror characterized by a f/2 focal ratio. It is a collaborative project between Belgium, Canada, India and Poland. The participating institutions are: Institute of Astrophysics and Geophysics of the Liege University (IAGL), the Royal Observatory of Belgium (ROB), six Canadian universities (British Columbia, Laval, Montreal, Toronto, Victoria and York), the Aryabatta Research Institute of Observational Sciences (ARIES, Nainital, India) and the Observatory of Poznan (UAM, Poland). This telescope is being installed at the Devasthal observatory, India (Longitude 79° 41' 04'' E, +29° 21' 40'' N, altitude 2450m), in the central Himalayas. First light should happen in early 2016. It will image every night a strip of sky having an approximate width of 27' in declination using a 4096 x 4096 pixel CCD detector that will work in the time delay integration (TDI) mode. The ILMT will thus perform a deep survey of a long and narrow strip of sky by looking at stars, galaxies, AGN, quasars, asteroids, space debris, ... crossing its field of view. It will observe in the i', r', g' SDSS spectral bands. This survey will thus be mainly dedicated to photometric and astrometric variability studies of faint objects. Among the main scientific goals, let us mention the detection and follow up of a few tens of multiply imaged quasars produced by gravitational lensing, hundreds of supernovae every year, detection of nearby brown dwarfs, white dwarfs and other faint stars based upon their trigonometric parallax and/or proper motion measurements, photometric variability studies of thousands of quasars and millions of stars as well as space debris detection at dusk and/or at dawn. Right now, numerous data sets have already been obtained of the ILMT strip of sky with smaller telescopes in the TDI mode. These will be used to carry out preliminary scientific projects and calibration of the ILMT data. A pipeline and database are presently in construction at the Poznan Observatory. Some videos and recent photographs will illustrate the present status of the ILMT project. [less ▲]

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See detailDiasporic Experience and Music in Caryl Phillips’s Crossing the River
Mascoli, Giulia ULg

Conference (2015, September 07)

This paper deals with Caryl Phillips who has incessantly represented diasporic experience in his work where he evokes complex identities at the crossroads between Africa, the Caribbean and Europe. My ... [more ▼]

This paper deals with Caryl Phillips who has incessantly represented diasporic experience in his work where he evokes complex identities at the crossroads between Africa, the Caribbean and Europe. My proposal is to concentrate on Phillips’s novel Crossing the River (1993) which extensively explores the theme of the African diaspora and which, interestingly, has also been described as his most jazzy text. This narrative not only addresses diasporic themes, such as uprootings and lost origins, but very much like jazz -- which is for Brathwaite “a cry from the heart of the hurt man” (277) – it gives a voice to the victims of history, to shattered individuals in pain whose tragic fate is viewed at once as personal and collective. Benítez-Rojo draws attention to the importance of rhythm in this text, but he only provides a limited analysis with no specific examples of how this significant feature of the work is achieved or the purposes it serves. In this paper I will try to demonstrate that Phillips’s thematic and formal use of music, including the references to classic themes of the African American musical tradition or the recurrent and creative use of repetitions, has a performative role and reenacts the duty of remembering inherent in the diasporic experience. [less ▲]

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See detailCHARACTERIZATION OF TEN STRAINS OF FILAMENTOUS CYANOBACTERIA FROM THE SOUTH SHETLAND ISLANDS, MARITIME ANTARCTICA
Kovacik, Lubomir; Pereira, Antonio; Dusinsky, Roman et al

Poster (2015, September 07)

The evolutionary relationships of ten Antarctic cyanobacterial strains of the order Oscillatoriales isolated from King George Island and Deception Island, South Shetland Islands were studied by a ... [more ▼]

The evolutionary relationships of ten Antarctic cyanobacterial strains of the order Oscillatoriales isolated from King George Island and Deception Island, South Shetland Islands were studied by a polyphasic approach. Phenotypic observations of the morphological features and genotypic analyses (16S rRNA and ITS sequences) were performed. Based on major phenotypic features, the strains were divided into four distinct morphotypes: Leptolyngbya borchgrevinkii (A), Leptolyngbya frigida (B), Phormidium autumnale (C) and Wilmottia murrayi (D). This morphological identification was in global agreement with the evolutionary relationships. According to the phylogenetic analysis, the ten strains were divided into two major clades, containing related strain sequences with Leptolyngbya morphotypes in one clade and with morphotypes corresponding to Phormidium, Wilmottia and Microcoleus spp. in the other clade. Each major clade was divided into two sub-clades. For the first time, the 16S rRNA gene sequence of a strain corresponding to the Leptolyngbya borchgrevinkii morphotype (A) was determined, on the basis of strain KOVACIK-ANT 1990/4. The closest sequence to our morphotype A is the clone Fr252 isolated from microbial mat of Antarctic Lake Fryxell. Morphotype B is closest to sequences assigned to Leptolyngbya frigida isolated from microbial mats of lakes in continental East Antarctica. Morphotype C belongs to a cluster including strains with morphotypes corresponding to Phormidium autumnale from Antarctica, but also from Europe. Morphotype D is grouped with sequences of the morphotype assigned to Wilmottia murrayi isolated from Antarctica. [less ▲]

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See detailCitizens abroad and Regional Elections: A diffusionist Perspective
Lafleur, Jean-Michel ULg; Arrighi, Jean-Thomas

Conference (2015, September 06)

In this paper we shift the focus away from the state to the regional demos with the aim to introduce the notion of scale in the study of external voting. It is divided into three parts. Following a ... [more ▼]

In this paper we shift the focus away from the state to the regional demos with the aim to introduce the notion of scale in the study of external voting. It is divided into three parts. Following a preliminary discussion on the external franchise from a sub-state perspective, we proceed with a comparative overview of the rules of acquisition and loss of the franchise in regional elections and show that the extension of the franchise to ‘regional expatriates’ is a relatively exceptional practice. We then identify factors that in our view are key to understand the absence of a vertical diffusion of the external franchise to lower levels of government, in sharp contrast with its rapid horizontal diffusion at the state level. The second part examines the debates surrounding the inclusion and exclusion of the franchise in three cases of protracted nationalist mobilization that translated into far reaching territorial autonomy: Catalonia, Scotland and Flanders. The third and final section contrasts the similarities and differences that can be found between our three cases and reflects upon the lessons that can be drawn from them. [less ▲]

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See detailBinge Drinking at young age
Gavray, Claire ULg

Conference (2015, September 05)

discussion théorique et méthodologique sur le concept et la mesure du binge drinking. Présentation des facteurs liés à cette pratique chez les adolescents filles et garçons. Analyse des résultats à la ... [more ▼]

discussion théorique et méthodologique sur le concept et la mesure du binge drinking. Présentation des facteurs liés à cette pratique chez les adolescents filles et garçons. Analyse des résultats à la lumière des opportunités historiques sexuées en évolution.données ISRD3-Belgique [less ▲]

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See detailSelf-Reported Delinquency Survey: Comparison of Two Methods Among Female and Male Detained Adolescents
Grégoire, Julie ULg; Mathys, Cécile ULg

Poster (2015, September 04)

Self-report delinquency (SRD) surveys have begun to be used more than 70 years ago to measure delinquency (Porterfield, 1943). Since then, lots of methods have been developed (e.g. P&P questionnaire ... [more ▼]

Self-report delinquency (SRD) surveys have begun to be used more than 70 years ago to measure delinquency (Porterfield, 1943). Since then, lots of methods have been developed (e.g. P&P questionnaire, telephone interviewing, face-to-face interviewing, CASI, ACASI) for data collection (Kleck & Roberts, 2012). Although a lot of researches have assessed the participation rates of these methods, most of SRD surveys are submitted to non-detained adolescents . We have therefore noticed that those methods only allow us to know but little about the participation rate of young detainees and about their motivation to take part in a SRD survey. This research, which constitutes the pre-test of a further larger research, aims to: 1) Identify which method of SRD (comparing Paper & Pencil (P&P) questionnaire and Web questionnaire) has the highest participation rate and is the most attractive for young detained people, and if there are differences between boys and girls. 2) Determine the impact of an incentive on the motivation to participate in a survey, and if there are differences between boys and girls. As a result, we can observe that the SRD survey method doesn’t seem to have an influence on the participation rate of youth from detention centers. Nevertheless, the most attractive SRD survey method seems to be the Web one. As it is also less discouraging, it seems preferable to use this method with these adolescents whenever it is possible. Regarding the different kinds of incentives regularly used in research, their impact on the decision to take part in a survey turns out to be very weak, even nonexistent or negative. It appears that an incentive for juveniles placed in detention centers is inappropriate to increase their motivation to participate. [less ▲]

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See detailEVALUATION OF SV2Alox/Cre TRANSGENIC MOUSE USING [18F]UCB-H IN IN VITRO AUTORADIOGRAPHY
Serrano Navacerrada, Maria Elisa ULg; Becker, Guillaume ULg; MENTEN, Catherine ULg et al

Poster (2015, September 04)

Background: SV2A is the most studied isoform of the Synaptic Vesicle 2 proteins, which are involved in the synaptic vesicle trafficking. Interestingly, the SV2A has been identify as the binding site for ... [more ▼]

Background: SV2A is the most studied isoform of the Synaptic Vesicle 2 proteins, which are involved in the synaptic vesicle trafficking. Interestingly, the SV2A has been identify as the binding site for the antiepileptic drug levetiracetam, showing a close relation between the epilepsy, the dysregulation of the SV2A levels and the response to antiepileptic medications. SV2A floxed-mice were developed using a cre-lox technique, leading to a strong decrease of SV2A expression in the CA3 field of the hippocampus. We aim here to validate this model using [18F]UCB-H, a novel PET imaging radiotracer with a nanomolar affinity for human SV2A. Methods: In vitro autoradiography were performed on SV2Alox/Cre+ transgenic mouse brain slices. SV2Alox/Cre- mouse was used as control. To obtain a structural reference, brain slices underwent eosin-haematoxylin staining. Images of both procedures were coregistered using π-PMOD software. Regions of interest (Dentate Gyrus, CA1, CA2 and CA3) were drawn according to a stereotaxic atlas of the mouse brain. Results: Analyses showed significant differences in radiotracer binding (p<0.001) between SV2Alox/Cre+ mouse and SV2Alox/Cre- mouse highlighting an important reduction for the labelling density in Ammon's horn, particularly in CA1, compared to Dentate Gyrus where the diminution was less marked. Conclusions: Here, we used the radiotracer [18F]UCB-H to probe the decreased expression of SV2A protein in the hippocampus of SV2Alox/Cre+ mouse versus SV2Alox/Cre- control mouse. Our results contribute to the validation of the model, and encourage us to proceed with further longitudinal and behavioural studies. [less ▲]

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See detailSeasonality in human cognitive brain responses.
Meyer, Christelle ULg; Muto, Vincenzo ULg; Jaspar, Mathieu ULg et al

Poster (2015, September 04)

Detailed reference viewed: 172 (8 ULg)
Peer Reviewed
See detailThe impact of ageing on episodic memory encoding: an fMRI study
François, Sarah ULg; Angel, Lucie; SALMON, Eric ULg et al

Poster (2015, September 04)

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See detailFrom Aleph to Alma: Fulfillment, feel it fully
Van Ruymbeke, Muriel ULg; Lhoest, Rémy ULg; Thirion, Paul ULg

Conference (2015, September 04)

If it is well prepared, migrating from Aleph to Alma brings users a lot of advantages. To reach the go live day with as less worries as possible, ULg Library's preparation consisted in two things: a deep ... [more ▼]

If it is well prepared, migrating from Aleph to Alma brings users a lot of advantages. To reach the go live day with as less worries as possible, ULg Library's preparation consisted in two things: a deep understanding of Alma new concepts and a simplification of our physical fulfillment policy. This presentation, based on our experience, will aim at describing the main differences between Aleph and Alma regarding fulfillment concepts and their significant consequences on implementation and migration jobs. On a fulfillment point of view, what distinguishes Aleph from Alma is that, in Aleph, the circulation policy is based on item status. On the contrary in Alma it is based on the location, and its traffic rules built by a set of terms of uses (TOU). Numerous other idioms complete the Alma toolkit and allow physical item’s fulfillment customizing. But to really enjoy the new possibilities given by Alma, it is important to fully feel the necessary changes… at the very beginning ! [less ▲]

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See detailMagnetic shielding properties of tubular bulk superconductors subjected to stray magnetic fields
Hogan, Kevin ULg; Fagnard, Jean-François ULg; Wera, Laurent ULg et al

Conference (2015, September 04)

Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. The vast majority of studies on superconducting shields has been conducted in homogeneous ... [more ▼]

Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. The vast majority of studies on superconducting shields has been conducted in homogeneous magnetic field configurations. Only few works have been done concerning inhomogeneous magnetic field configurations while those are representative of practical situations. Moreover, those configurations are non-trivial given the magnetic hysteretic behaviour of type-II superconductors. In the present work, we aim at investigating and understanding the magnetic response of a superconducting hollow cylinder made of Bi-2223 subjected to the magnetic stray field of various magnetic sources. Thanks to a bespoke 3D mapping system and a three-axis Hall probe, we measure the magnetic flux density distribution in the vicinity of the cylinder when the latter is subjected to those stray fields. All experiments are carried out in liquid nitrogen. Our experimental data allow us to apprehend the magnetic field penetration inside the superconductor in inhomogeneous field configurations and to compare those to results obtained with homogeneous fields. Then we compare our results to a finite element model of an infinite tube subjected to an inhomogeneous magnetic field in order to gather information on the magnetic field penetration and the current density distribution inside the superconductor. [less ▲]

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See detailAge-related modulations in cognitive functions and its cerebral underpinnings
Collette, Fabienne ULg

Conference (2015, September 04)

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See detailThe executive functioning in normal aging: Impact of the cognitive reserve
Simon, Jessica ULg; Gilsoul, Jessica ULg; Collette, Fabienne ULg

Poster (2015, September 04)

There exists a large inter-individual variability regarding the effects of aging on cognition. According to Stern (2009), people who developed a high level of reserve are more resilient to the effects of ... [more ▼]

There exists a large inter-individual variability regarding the effects of aging on cognition. According to Stern (2009), people who developed a high level of reserve are more resilient to the effects of aging that individuals with lower cognitive reserve. In this study, we describe the impact of cognitive reserve on executive functions in normal aging. Ninety healthy participants aged from 60 to 80 years were recruited. We assessed the three major executive functions: Inhibition (Stroop test, Hayling test, TAP Incompatibility subtest), Shifting (TAP Flexibility subtest, Plus-Minus task), and Updating (Letter-Number Sequencing subtest from MEM III, Letter memory task, 2-back task). Cognitive reserve was measured by questionnaires assessing educational level, occupation, leisure activities and physical activity across the life. Multiple linear regressions (p<0.05) adjusted for age, quality of sleep, processing speed showed that elderly with a high level of reserve have better performance on updating. We also assessed the effect of each factor of cognitive reserve separately after adjustment for the other. We observed that people with high level of education have better performance on flexibility (TAP Flexibility subtest and composite score) and on updating (Letter-Number Sequencing subtest, Letter memory and composite score). However, we didn’t observe any significant effect of the other factors of cognitive reserve. These results suggest that the cognitive reserve is related to abilities in some executive tests. [less ▲]

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See detailUne féminité en métamorphose: Représentation de la féminité noire dans le cinéma black-British
Herbert, Emilie ULg

Conference (2015, September 03)

Le long-métrage "Burning an illusion", réalisé par Menelik Shabazz, met en scène l'éveil politique d'une jeune femme noire, Pat (Cassie McFarlane) lorsqu'elle fait l'expérience du racisme et de la ... [more ▼]

Le long-métrage "Burning an illusion", réalisé par Menelik Shabazz, met en scène l'éveil politique d'une jeune femme noire, Pat (Cassie McFarlane) lorsqu'elle fait l'expérience du racisme et de la violence dans les rues de Londres. "Burning an illusion" est l'un des premiers films black British à prendre pour personnage principal une femme et Shabazz décrit la conscientisation politique de Pat en termes ouvertement féminins : sa transformation intellectuelle passe en effet par une métamorphose physique. A travers une africanisation de son apparence (son maquillage disparaît, ses vêtements changent et ses cheveux, soigneusement lissés au début du film, reprennent leur apparence naturelle), Pat manifeste son rejet des codes de beauté occidentaux qui annihilent les femmes noires en imposant la blancheur comme point de référence. Ce long-métrage, réalisé en 1981, met en avant une notion développée par un féminisme noir qui s'éveille à la même époque en Grande-Bretagne : celle de la (re)conquête de la féminité noire à travers la création d'une identité black British fluide qui reconnaît la nature fragmentée des identitées hybrides, racialisées et genrées (Mirza, 1997). L'analyse d'un corpus de plusieurs films du mouvement du black British Cinema des années 1980 et 90 à travers une approche intersectionnelle, féministe et de genre nous permettra de comprendre ce processus de redéfinition de la féminité noire, jusqu'alors rendue invisible au sein du cinéma britannique blanc (Bourne, 2001). Les films étudiés encouragent en effet la revalorisation de la beauté naturelle du corps féminin noir, permettant ainsi son mouvement d'objet à sujet (Weekes, 1997), en passant par un processus de métamorphose physique. Le corps y est fragmenté (Coly, 2010) afin d'en déconstruire l'image socialement et culturellement produite (Jordan-Zachery, 2013) et de créer ainsi une nouvelle syntaxe qui permet d'articuler et de comprendre le corps féminin noir différemment (Doane, 1981). [less ▲]

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See detailWhy are flux avalanches deflected by a metallic layer?
Brisbois, Jérémy ULg

Poster (2015, September 03)

Sudden avalanches of magnetic flux bursting into a superconducting sample are deflected from their trajectories when they encounter a conductive layer deposited on top of the superconductor. Remarkably ... [more ▼]

Sudden avalanches of magnetic flux bursting into a superconducting sample are deflected from their trajectories when they encounter a conductive layer deposited on top of the superconductor. Remarkably, in some cases the flux is totally excluded from the area covered by the conductive layer. Even if this phenomenon has been known for a few years, there is currently no theoretical model describing it. Moreover, the question whether the deflection would also be observed for a single vortex entering the region covered by a metallic layer is still unanswered. In this work we use the magneto-optical imaging (MOI) technique, based on the Faraday effect, to show that a conductive layer (Cu) can repel flux avalanches triggered in an underlying superconducting film (Nb) (see figure). We present a simple classical model that accounts for the deflection of a single vortex and considers a magnetic monopole approaching a semi-infinite conductive plane. This model suggests the important role played in the avalanche deflection by electromagnetic braking, arising from the eddy currents induced by the moving vortex in the metal. Moreover, we have found a decrease of the vortex damping coefficient due to the metallic sheet at large vortex velocities, correcting early theoretical descriptions where a linear behaviour was proposed. [less ▲]

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See detailLa Banque de Données des Epiclèses Grecques (BDEG) dans le cadre des Humanités numériques : questions théoriques et méthodologiques.
Lebreton, Sylvain ULg

Poster (2015, September 03)

Quiconque est un peu familier avec les textes grecs antiques peut aisément prendre la mesure de la richesse, en nombre et en diversité, des épiclèses (épithètes cultuelles) que les anciens Grecs ont ... [more ▼]

Quiconque est un peu familier avec les textes grecs antiques peut aisément prendre la mesure de la richesse, en nombre et en diversité, des épiclèses (épithètes cultuelles) que les anciens Grecs ont attribuées à leurs divinités. Cette importance, tant quantitative que qualitative, fait de ces dénominations un vecteur extrêmement pertinent pour l'étude du polythéisme hellénique, en même temps qu'elle constitue un défi analytique de premier ordre. Compte tenu de cette abondance, de la masse documentaire mise à contribution (surtout si l'on envisage le monde grec antique dans son ensemble), mais aussi de la complexité des relations entre les différentes composantes de la « société des dieux » des anciens Grecs, une telle étude peut tirer grand profit du recours à des outils de traitement quantitatif des données. Ce constat est à l'origine de la création, il y a une dizaine d'années, de la Banque de Données des Epiclèses Grecques (BDEG), dans le cadre du LAHM (ex-Crescam, UMR 6566 CReAAH) de l'Université Rennes 2 (https://epiclesesgrecques.univ-rennes1.fr/accueil.php). Le projet est toujours en cours de développement et constitue de ce fait une étude de cas potentiellement intéressante dans le cadre d'une réflexion sur les Humanités numériques dans le champ de l'Antiquité. En effet, la confrontation avec la réalité des données documentaires (en l'occurrence principalement littéraires et épigraphiques), les progrès dans la réflexion sur le traitement quantitatif et les évolutions des outils numériques ont rendu nécessaire l'évolution de la BDEG depuis sa création. On s'attachera donc à présenter certains pans de cette évolution – passés, en cours et à venir – en insistant sur les problèmes méthodologiques qu'ils posent du point de vue des Humanités numériques. [less ▲]

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See detailWildflowers sown at field margins have positive and negative effects on pests and parasitoids
Hatt, Séverin ULg; Uyttenbroeck, Roel ULg; Chevalier Mendes Lopes, Thomas ULg et al

Conference (2015, September 03)

Wildflower strips are sown at field margins throughout Europe to support insect conservation in agricultural areas. Among other insects, parasitoids may favor a biological regulation of pests. On an ... [more ▼]

Wildflower strips are sown at field margins throughout Europe to support insect conservation in agricultural areas. Among other insects, parasitoids may favor a biological regulation of pests. On an experimental field of the research platform AgricultureIsLife in Gembloux (University of Liège, Belgium), three replications of five wildflower seed mixtures were sown in strips adjacent to crops in spring 2013. Insect pests and their parasitoids were pan-trapped in spring 2014 in both wildflower strips and oilseed rape crops and identified at the species level. Flower species and cover were monitored in the strips using 1 m² quadrats, before mowing. Meligethes spp. were found abundantly in crops when oilseed rape was blooming. Meligethes’ parasitoids occurred later and their abundance was positively correlated with that of Meligethes in the flower strips. At the crop ripening stage, weevils Ceutorhynchus spp. occurred and were followed by an increase in abundance of their parasitoids in both crops and flowers. Positive as well as negative correlations were found between the abundance of these pests, their parasitoids and different flower species blooming at this time. The link between these results with flower species’ functional traits will be discussed. [less ▲]

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See detailFragility Analysis of a Steel Building in Fire
Gernay, Thomas ULg; Elhami Khorasani, Negar; Garlock, Maria

in Usmani, Asif; Lu, Yong; Das, Purnendu (Eds.) Proceedings of the First International Conference on Structural Safety under Fire & Blast - CONFAB 2015 (2015, September 03)

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings ... [more ▼]

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings to fire following earthquake, a potentially highly destructive cascading multi-hazard event. In a previous part of the work, a model has been developed to predict the probability of ignition in a building due to an earthquake. Given an ignition in a building, the probability of the structure exceeding certain limit states must be evaluated in order to quantify the expected damage loss. Adopting an approach similar to that used in seismic engineering, fragility functions can be developed for structures subjected to fire. The methodology is described here for a prototype nine-story steel frame building. In developing the fragility functions, uncertainties in the fire model, the heat transfer model and the thermo-mechanical response are considered. In addition several fire scenarios at different locations in the building are studied. The demand on and capacity of the system are assessed probabilistically in terms of critical temperature. The developed fire fragility functions yield the probability of exceedance of predefined damage states as a function of the fire load in the building. Future works will aim to implement fire fragility functions into a GIS based risk assessment software platform for assessment of the expected risk and cost associated with fire following earthquake for a community of buildings. [less ▲]

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See detailMilk biomarkers to detect ketosis and negative energy balance using MIR spectrometry
Grelet, Clément ULg; Bastin, Catherine ULg; Gelé, Marine et al

Conference (2015, September 02)

Detailed reference viewed: 35 (11 ULg)