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See detailCreative Playground ( Jean François Foliez) - vidéo "Home" ( composition Johan Dupont)
Sacré, Robert ULg

E-print/Working paper (2017)

Spectacle "Creative Playground 2017" Théâtre de Liège, 4 mars 2017; en vidéo "Home" une composition du pianiste Johan Dupont

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See detailThe origin of CIMP or how to increase international contacts between Paleozoic palynologists during the second part of last century.
Streel, Maurice ULg

in Commission internationale de la microflore du Paléozoïque CIMP Newsletter (2017), 86

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See detailDevelopment of Specifications and Performance Criteria for Surface Preparation Based on Issues Related to Bond Strength
Bissonnette, Benoît; Courard, Luc ULg; Garbacz, Andrzej et al

Report (2017)

In addition to the development of a satisfactory test procedure and recommendations to improve the overall quality of concrete repair works, the authors of this proposal intend to collaborate with various ... [more ▼]

In addition to the development of a satisfactory test procedure and recommendations to improve the overall quality of concrete repair works, the authors of this proposal intend to collaborate with various representatives from public agencies and from the industry to facilitate technological transfer. Presentations will be made in conferences and workshops in North America and Europe. At the end of the project, the results shall include two MSc theses and at least two papers in major journals, such as Concrete International or ACI Materials Journal. Also, the project should provide the basis towards a standard procedure for the evaluation of superficial cohesion of concrete, in relation with surface preparation and concrete removal techniques. Finally, recommendations and specifications could be incorporated in future versions of the ACI-ICRI Manual of Concrete Repairs as well as in DOT’s specifications. [less ▲]

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See detailSeasonal plasticity of auditory saccular sensitivity in “sneaker” type II male plainfin midshipman fish, Porichthys notatus
Bhandiwad, Ashwin A.; Whitchurch, Elizabeth A.; Colleye, Orphal ULg et al

in Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural and Behavioral Physiology (2017), 203(3), 211-222

Adult female and nesting (type I) male midshipman fish (Porichthys notatus) exhibit an adaptive form of auditory plasticity for the enhanced detection of social acoustic signals. Whether this adaptive ... [more ▼]

Adult female and nesting (type I) male midshipman fish (Porichthys notatus) exhibit an adaptive form of auditory plasticity for the enhanced detection of social acoustic signals. Whether this adaptive plasticity also occurs in “sneaker” type II males is unknown. Here, we characterize auditory-evoked potentials recorded from hair cells in the saccule of reproductive and non-reproductive “sneaker” type II male midshipman to determine whether this sexual phenotype exhibits seasonal, reproductive state-dependent changes in auditory sensitivity and frequency response to behaviorally relevant auditory stimuli. Saccular potentials were recorded from the middle and caudal region of the saccule while sound was presented via an underwater speaker. Our results indicate saccular hair cells from reproductive type II males had thresholds based on measures of sound pressure and acceleration (re. 1 μPa and 1 ms−2, respectively) that were ~8–21 dB lower than non-reproductive type II males across a broad range of frequencies, which include the dominant higher frequencies in type I male vocalizations. This increase in type II auditory sensitivity may potentially facilitate eavesdropping by sneaker males and their assessment of vocal type I males for the selection of cuckoldry sites during the breeding season. [less ▲]

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See detailRendre compte de la société d’aujourd’hui
Quoilin, Cécile; Postula, Jean-Louis ULg

in Cahiers de muséologie - Dans la marge (2017)

Founded a century ago as a classical museum of regional ethnography, the Museum of Walloon Life is now facing the challenge of an essential update and the redefinition of its museum project. For about ten ... [more ▼]

Founded a century ago as a classical museum of regional ethnography, the Museum of Walloon Life is now facing the challenge of an essential update and the redefinition of its museum project. For about ten years, the choice of the approach known as "society museum" on the occasion of the total renovation of the building, led to an in-depth review of the acquisition and exhibition policies but also of the nature of field research and relationships with its different audiences. This article shows the practical consequences of the implementation of this new model, which now places the man rather than the collections at the center of discourse, on all museum functions. One of its fundamental objectives is to allow the development within the Museum of the sometimes complex issues of contemporary society. [less ▲]

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See detailPosidonies : Lire dans les prairies sous-marines
Abadie, Arnaud ULg; Gobert, Sylvie ULg; Pergent, Gérard

Article for general public (2017)

Les “feuilles” qui s’amoncèlent sur les plages de Méditerranée sont le souvenir échoué des luxuriantes prairies sous-marines qui tapissent les fonds. C’est un écosystème fragile dont dépend un grand ... [more ▼]

Les “feuilles” qui s’amoncèlent sur les plages de Méditerranée sont le souvenir échoué des luxuriantes prairies sous-marines qui tapissent les fonds. C’est un écosystème fragile dont dépend un grand nombre d’espèces : les chercheurs doivent apprendre à “lire” les fonds pour identifier les menaces qui pèsent sur la posidonie. [less ▲]

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See detailLaos, Demos, Ethnos. Le peuple a bon dos
Jacquemain, Marc ULg

Article for general public (2017)

Si le républicanisme français est si obsédé par le "visible" et "l'invisible" dans l'espace public, c'est parce qu'il confond l'universalisme idéal de sa devise et le particularisme de ses pratiques ... [more ▼]

Si le républicanisme français est si obsédé par le "visible" et "l'invisible" dans l'espace public, c'est parce qu'il confond l'universalisme idéal de sa devise et le particularisme de ses pratiques réelles. La critique s'inspire de celle de Cécile Laborde dans "Critical Republicanism". [less ▲]

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See detailEtude de la composition chimique et de l’activité antioxydante des différents extraits de la Lavande dentée (Lavandula dentata)
Bettaieb Rebey, I.; Bourgou, S.; Saidani Tounsi, M. et al

in Journal of New Sciences Agri & Biotech (2017), 39(2), 2096-2105

In this study, Lavandula dentata organs (roots, stems and leaves) were investigated for their essential oils, total phenolics, flavonoids contents and antioxidant activities. Essential oil yields were 0 ... [more ▼]

In this study, Lavandula dentata organs (roots, stems and leaves) were investigated for their essential oils, total phenolics, flavonoids contents and antioxidant activities. Essential oil yields were 0.22% in roots, 0.68 % in stems and 0.89 % in flowers. Major components of the oils were β-ocimene, limonene and 1,8 cineol in roots, stems and leaves and flowers, respectively. In all organs, total phenolics content ranged from 42.57 to 16.17 mg gallic acid equivalents per gram of dry weight (mg GAE/g DW).The antioxidant activities of Lavandula dentata extracts obtained from the three organs were assessed using two tests (DPPH and reducing power). The root extract was strongly effective as DPPH radical scavenger and reducing agent. Thus, the identification of individual target polyphenolic compounds of roots was performed by RP-HPLC. The major phenolic compound detected in roots was rosmarinic acid. This activity was high enough for the plant to be a new and natural source of strongly antioxidant substances for use as natural additives in food and pharmaceutical industry. [less ▲]

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See detailConstraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass
Eggenberger, P.; Lagarde, N.; Miglio, A. et al

in Astronomy and Astrophysics (2017), 599

Context: Constraints on the internal rotation of red giants are now available thanks to asteroseismic observations. Preliminary comparisons with rotating stellar models indicate that an undetermined ... [more ▼]

Context: Constraints on the internal rotation of red giants are now available thanks to asteroseismic observations. Preliminary comparisons with rotating stellar models indicate that an undetermined additional process for the internal transport of angular momentum is required in addition to purely hydrodynamic processes. Aims: We investigate how asteroseismic measurements of red giants can help us characterize the additional transport mechanism. Methods: We first determine the efficiency of the missing transport mechanism for the low-mass red giant KIC 7341231 by computing rotating models that include an additional viscosity corresponding to this process. We then discuss the change in the efficiency of this transport of angular momentum with the mass, metallicity and evolutionary stage. Results: In the case of the low-mass red giant KIC 7341231, we find that the viscosity corresponding to the additional mechanism is constrained to the range 1 x 10^3 - 1.3 x 10^4 cm^2/s. This constraint on the efficiency of the unknown additional transport mechanism during the post-main sequence is obtained independently of any specific assumption about the modelling of rotational effects during the pre-main sequence and the main sequence (in particular, the braking of the surface by magnetized winds and the efficiency of the internal transport of angular momentum before the post-main-sequence phase). When we assume that the additional transport mechanism is at work during the whole evolution of the star together with a solar-calibrated braking of the surface by magnetized winds, the range of nu_add is reduced to 1 - 4 x 10^3 cm^2/s. In addition to being sensitive to the evolutionary stage of the star, we show that the efficiency of the unknown process for internal transport of angular momentum increases with the stellar mass. [less ▲]

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See detailComment les vidéastes gagnent-ils leur vie sur Youtube ?
Krywicki, Boris ULg

in Culture, le Magazine Culturel de l'Université de Liège (2017)

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See detailAnalyse de l’impact social des IDESS
Vanmeerbeek, Perrine ULg; Fallon, Catherine ULg; Italiano, Patrick ULg et al

Report (2017)

Ce rapport présente les résultats de recherche d'une analyse de l'impact social et des externalités positives des Initiatives de Développement de l'Emploi dans le secteur des Services de Proximité à ... [more ▼]

Ce rapport présente les résultats de recherche d'une analyse de l'impact social et des externalités positives des Initiatives de Développement de l'Emploi dans le secteur des Services de Proximité à finalité Sociale (IDESS). Les IDESS ont un double objectif : l'aide sociale à une population précarisée, et l'insertion socioprofessionnel de personnes éloignées du monde de l'emploi. Trois modèles-types de fonctionnement des IDESS sont développés dans ce rapport, et permettent d'appréhender à la fois les objectifs, les logiques d'action, et les impacts des IDESS. [less ▲]

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See detailValidation of SAFIR through DIN EN 1992-1-2 NA: Comparison of the results for the examples presented in Annex CC
Romeiro Ferreira, Joao Daniel ULg; Franssen, Jean-Marc ULg; Gernay, Thomas ULg

Report (2017)

Annex CC of DIN EN 1992-1-2 NA presents a series of cases that allow benchmarking software tools aimed at the design of structures in a fire situation. With the goal of providing a validation document for ... [more ▼]

Annex CC of DIN EN 1992-1-2 NA presents a series of cases that allow benchmarking software tools aimed at the design of structures in a fire situation. With the goal of providing a validation document for the finite element code SAFIR, a comparison of the reference results for the cases presented in the Annex CC with the results obtained with SAFIR has been carried out and is presented in this document. The validation typically consists in a comparison between the value of a result (temperature, displacement or others) obtained by SAFIR and the value given as a reference and supposed to be the « true » result. The value obtained must fall in the interval stipulated by the document. The parametric analysis shows that the solution of SAFIR satisfies the requirement of the standard. The solution converges to the theoretical solution when the density of the mesh is increased and the value of the time step is reduced. When refining the mesh, rectangular elements converge slightly faster than triangular element; regular structured meshes are most efficient, with slight differences being observed in distorted structured meshes; unstructured meshes are somehow less efficient while being still in the acceptable range of the standard. [less ▲]

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See detailChris BEARD - The Prince of the Blues
Sacré, Robert ULg

E-print/Working paper (2017)

Interview de Chris BEARD + record reviews

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See detailAccurate Control of 17beta-Estradiol Long-Term Release Increases Reliability and Reproducibility of Preclinical Animal Studies.
Gérard, Céline ULg; Gallez, Anne ULg; Dubois, Charline ULg et al

in Journal of Mammary Gland Biology & Neoplasia (2017), 22(1), 1-11

Estrogens are the subject of intensive researches aiming to elucidate their mechanism of action on the various tissues they target and especially on mammary gland and breast cancer. The use of ready-to ... [more ▼]

Estrogens are the subject of intensive researches aiming to elucidate their mechanism of action on the various tissues they target and especially on mammary gland and breast cancer. The use of ready-to-use slow releasing devices to administer steroids, especially estrogens, to small experimental animals remains the method of choice in terms of animal well-being and of safety for both the researcher and the animal. In this study, we evaluated and compared, in vitro and in vivo, the release kinetic of estradiol (E2) over sixty days from two different slow-releasing systems: the matrix pellet (MP) and the reservoir implant (RI). We compared the impact of these systems in three E2-sensitive mouse models : mammary gland development, human MCF7 adenocarcinoma xenograft and mouse melanoma progression. The real amount of E2 that is released from both types of devices could differ from manufacturer specifications due to inadequate release for MP and initial burst effect for RI. Compared to MP, the interindividual variability was reduced with RI thanks to a superior control of the E2 release. Depending on the dose-dependent sensitivity of the physiological or pathological readout studied, this could lead to an improvement of the statistical power of in vivo experiments and thus to a reduction of the required animal number. Altogether, our data draw attention on the importance to adequately select the slow-releasing device that is the most appropriated to a specific experiment to better fulfill the 3Rs rule (Replacement, Reduction, Refinement) related to animal welfare and protection. [less ▲]

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See detail« Traitement fiscal des dividendes – Fiscalité européenne et droit comparé »
Richelle, Isabelle ULg; Malherbe, Jacques

in Annunziata, Filippo (Ed.) Le droit comparé des affaires au XXIème siècle – Mélanges à la mémoire de Claude Ducouloux (2017)

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See detailFlux penetration in a superconducting film partially capped with a conducting layer
Brisbois, Jérémy ULg; Gladilin, V. N.; Tempere, J. et al

in Physical Review B (2017), 95

The influence of a conducting layer on the magnetic flux penetration in a superconducting Nb film is studied by magneto-optical imaging. The metallic layer partially covering the superconductor provides ... [more ▼]

The influence of a conducting layer on the magnetic flux penetration in a superconducting Nb film is studied by magneto-optical imaging. The metallic layer partially covering the superconductor provides an additional velocity-dependent damping mechanism for the flux motion that helps protecting the superconducting state when thermomagnetic instabilities develop. If the flux advances with a velocity slower than w = 2/µ0σt, where σ is the cap layer conductivity and t is its thickness, the flux penetration remains unaffected, whereas for incoming flux moving faster than w, the metallic layer becomes an active screening shield. When the metallic layer is replaced by a perfect conductor, it is expected that the flux braking effect will occur for all flux velocities. We demonstrate this effect by investigating Nb samples with a thickness step. Some of the observed features, namely the deflection and the branching of the flux trajectories at the border of the thick centre, as well as the favoured flux penetration at the indentation, are reproduced by time-dependent Ginzburg-Landau simulations. [less ▲]

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See detailFire resistance testing
Dumont, Fabien ULg

Learning material (2017)

The objective of determining fire resistance is to assess the behaviour of a specimen of a building element when subjected to defined heating, pressure and – if relevant – loading conditions. The ... [more ▼]

The objective of determining fire resistance is to assess the behaviour of a specimen of a building element when subjected to defined heating, pressure and – if relevant – loading conditions. The experimental methods provide a means of quantifying the ability of an element to withstand exposure to such stresses. More precisely, the issue is to quantify the separating and/or loadbearing capacity of a building element in order to ensure the separating function and/or structural stability of a building. A representative sample (called "test specimen") of the building element is exposed to a specified scheme of heating and – where relevant – of loading. The tests are carried out on specimens in full size or on small-scale models for elements exceeding the dimensions of the furnaces. The performances of the test specimen are determined by assessing criteria described in test methods. Fire resistance of the test specimen is expressed as the times for which the appropriate criteria have been satisfied. The times so obtained are a measure of the adequacy of the construction in a fire, but they have no direct relationship with the duration time of a real fire. In Europe, about 50 laboratories currently perform fire resistance tests. [less ▲]

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See detailDioxins! Hunting the Great White Shark
Focant, Jean-François ULg

Scientific conference (2017, March)

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