Last 7 days
Bookmark and Share    
Full Text
Peer Reviewed
See detailInfluence of the laboratory context and the size of the markers set on the tennis serve evaluation
Tubez, François ULg; Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg et al

Conference (2017, June 15)

The purpose of this study was to identify the influence on the tennis serve evaluation of 1/ the test environment and 2/ the number of the markers placed of the player. Two different studies were ... [more ▼]

The purpose of this study was to identify the influence on the tennis serve evaluation of 1/ the test environment and 2/ the number of the markers placed of the player. Two different studies were performed. The first compared a 4 vs. 28 marker set in a laboratory the same day. The second compared a 4 markers test in a laboratory with a 4 markers test on an official tennis court one week apart. We observed similar results between the different tests of both studies. [less ▲]

Detailed reference viewed: 33 (0 ULg)
Full Text
Peer Reviewed
See detailContributions of U-Th-Pb dating on the diagenesis and sediment sources of the Lower Group (BI) of the Mbuji-Mayi Supergroup (Democratic Republic of Congo)
François, Camille ULg; Kabamba Baludikay, Blaise ULg; Storme et al

in Precambrian Research (2017)

In this paper, we present new age constraints for the lower part of the Meso-Neoproterozoic sedimentary Mbuji-Mayi Supergroup (Democratic Republic of Congo, DRC). This Supergroup preserves a large ... [more ▼]

In this paper, we present new age constraints for the lower part of the Meso-Neoproterozoic sedimentary Mbuji-Mayi Supergroup (Democratic Republic of Congo, DRC). This Supergroup preserves a large diversity of organic-walled microfossils, evidencing the diversification of early eukaryotes for the first time in Central Africa. We use different methods such as in situ U-Pb geochronology by LA-ICP-MS and U-Th-Pb chemical datings by Electron Microprobe on diagenetic and detrital minerals such as xenotimes, monazites and zircons. We attempt to better constrain the provenance of the Mbuji-Mayi sediments and the minimum age of the Mbuji-Mayi Supergroup to constrain the age of the microfossils. Results with LA-ICP-MS and EMP provide new ages between 1030 and 1065 Ma for the diagenesis of the lower part of the sedimentary sequence. These results are consistent with data on biostratigraphy supporting the occurrence of worldwide changes at the Mesoproterozoic/Neoproterozoic boundary. [less ▲]

Detailed reference viewed: 10 (2 ULg)
Full Text
Peer Reviewed
See detailFrustrated crystallization of a monolayer of magnetized beads under geometrical confinement
Schockmel, Julien ULg; Vandewalle, Nicolas ULg; Opsomer, Eric ULg et al

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2017)

We present a systematic experimental study of the confinement effect on the crystallization of a monolayer of magnetized beads. The particles are millimeter-scale grains interacting through the short ... [more ▼]

We present a systematic experimental study of the confinement effect on the crystallization of a monolayer of magnetized beads. The particles are millimeter-scale grains interacting through the short range magnetic dipole-dipole potential induced by an external magnetic field. The grains are confined by repulsing walls and are homogeneously distributed inside the cell. A two-dimensional (2d) Brownian motion is induced by horizontal mechanical vibrations. Therefore, the balance between magnetic interaction and agitation allows investigating 2d phases through direct visualization. The effect of both confinement size and shape on the grains’ organization in the low-energy state has been investigated. Concerning the confinement shape, triangular, square, pentagonal, hexagonal, heptagonal, and circular geometries have been considered. The grain organization was analyzed after a slow cooling process. Through the measurement of the averaged bond order parameter for the different confinement geometries, it has been shown that cell geometry strongly affects the ordering of the system. Moreover, many kinds of defects, whose observation rate is linked to the geometry, have been observed: disclinations, dislocations, defects chain, and also more exotic defects such as a rosette. Finally, the influence of confinement size has been investigated and we point out that no finite-size effect occurs for a hexagonal cell, but the finite-size effect changes from one geometry to another. [less ▲]

Detailed reference viewed: 26 (1 ULg)
Full Text
Peer Reviewed
See detailHi-Fi simulation and teamwork training: what is it good for?
CARDOS, Benoît ULg; GILLET, Aline ULg; Ghuysen, Alexandre ULg et al

Poster (2017, June 15)

Detailed reference viewed: 21 (0 ULg)
Full Text
See detailAntifungigrammes: méthodologies et interprétation
Hayette, Marie-Pierre ULg

Conference (2017, June 15)

Detailed reference viewed: 20 (0 ULg)
Full Text
See detailLa ligue d'Action française: mode d'organisation et pratiques culturelles, sociales et politiques (1905-1936)
Schmidt, Anne-Catherine ULg

Doctoral thesis (2017)

Notre thèse se décline en une approche chronologico-thématique autour de trois pôles majeurs. Il s'agit, tout d'abord d'une démonstration qui entend établir un tableau aussi précis que possible de la ... [more ▼]

Notre thèse se décline en une approche chronologico-thématique autour de trois pôles majeurs. Il s'agit, tout d'abord d'une démonstration qui entend établir un tableau aussi précis que possible de la structure, des rouages et de l'implantation des organisations d'AF à Paris et en province. L'objectif est ensuite d'analyser les grandes matrices de l'engagement militant mais aussi et surtout leurs évolutions successives en lien avec un contexte politico-diplomatique extrêmement mouvant. Il s'agit pour chaque période donnée de chercher à comprendre ce qui constitue l'engagement au sein de la ligue dans une approche résolument tournée vers la base militante. Enfin, il faut réfléchir à la place et au rôle de l'AF dans la nébuleuse royaliste et nationaliste de son temps afin de comprendre les jeux d'alliance et de concurrence entre les diverses organisations mais aussi dans quelle mesure et de quelle manière la ligue d'AF s'est intégrée au répertoire d'action collective de son temps tout en participant à son renouvellement. Le choix de notre découpage chronologique répond à des nécessités à la fois contextuelles et propres à l'histoire de l'Action française. Au cours de la première période, de 1905 à 1914, on assiste à une structuration rapide et continue de l'appareil d'action intellectuelle et militante. Les rouages nationaux et locaux de la ligue se mettent en place et les matrices de l'engagement militant sont diffusées par l'intermédiaire du quotidien et contribuent à influencer l'opinion publique. A cette époque, l'AF est presque seule dans le champ nationaliste mais doit se positionner au sein du monde royaliste. Pendant la Grande Guerre, les structures de la ligue sont désorganisées. L'objectif principal est alors de continuer à diffuser le journal ce qui n'empêche pas la ligue d'utiliser le temps de guerre pour tenter de nouvelles méthodes de propagande notamment dans l'armée. La période 1914-1918 permet aussi à l'AF de se respectabiliser en choisissant la voie de l'Union sacrée. Elle reste malgré tout une organisation particulièrement surveillée d'autant plus que son influence dans l'opinion publique s'accroît. Après-guerre, l'AF se réorganise partout en province. Au cours de la période 1919-1926, elle fait l'expérience de la vie parlementaire et glisse, de fait, vers une sorte de conservatisme contre lequel elle s'est initialement constituée. Ses échecs électoraux couplés à l'influence croissante des communistes dans la vie publique contribuent à relancer son activisme militant mais pas suffisamment selon certains de ses membres qui suivent alors Georges Valois dans la dissidence du Faisceau. L'AF doit également faire face à l'apparition d'une nouvelle concurrence nationaliste avec la naissance des Jeunesses Patriotes. En 1926, elle est confrontée à la plus grave crise de son histoire : sa condamnation pontificale. Au cours de la période 1927-1929, la ligue cherche à rebondir et à maintenir son implantation et ses activités dans un contexte, par ailleurs, globalement défavorable. Les résultats sont extrêmement nuancés selon les régions mais, dans l'ensemble, il n'y a pas d'écroulement de sa structure militante même si les difficultés financières de la ligue sont de plus en plus importantes. Au tournant des années 1930, la crise économique aggrave encore ces difficultés mais contribue aussi à créer un contexte favorable à un nouvel épisode de flambée ligueuse. Au cours de la période 1933-1936, l'AF connaît un regain de vitalité dont le paroxysme se situe au moment du 6 février 1934. Cela étant, cet épisode démontre également les limites et les faiblesses du phénomène ligueur nationaliste en France. [less ▲]

Detailed reference viewed: 66 (11 ULg)
Full Text
Peer Reviewed
See detailComparison of UAS photogrammetric products for tree detection and characterization of coniferous stands
Bonnet, Stéphanie ULg; Lisein, Jonathan ULg; Lejeune, Philippe ULg

in International Journal of Remote Sensing (2017), 38(19), 5310-5337

The use of Unmanned Aerial Systems (UAS) opens a new era for remote sensing and forest management, which requires accurate and regular quantification of resources. In this study, we propose a ... [more ▼]

The use of Unmanned Aerial Systems (UAS) opens a new era for remote sensing and forest management, which requires accurate and regular quantification of resources. In this study, we propose a comprehensive workflow to detect trees and assess forest attributes in the particular context of coniferous stands in transformation from even-aged to uneven-aged stands, using UAS imagery, from data acquisition to model construction. We implement a local maxima detection to identify the tree tops, based on a fixed-radius moving window in a Canopy Height Model (CHM) and images produced from UAS surveys. To compare the contribution of different photogrammetric products, we analysed the local maxima detected from the CHM, from three image types (individual rectified and ortho-rectified images and ortho-mosaic) and from a combination of both CHM and images. The local maxima detection gave promising results, with low omission and true-positive rates of up to 89.2%. A filtering process of false positives was implemented, using a supervised classification which decreased the false positives up to 2.6%. Based on the local maxima combined with an area-based approach, we constructed models to assess top height (R2: 83%, root mean square error [RMSE]: 5.7%), number of stems (R2: 71%, RMSE: 28.3%), basal area (R2: 70%, RMSE: 16.2%), volume (R2: 69%, RMSE: 20.1%), and individual tree height (R2: 70%, RMSE: 7.2%). Despite a suboptimal data acquisition, our simple and flexible method has yielded good results and shows great potential for application. [less ▲]

Detailed reference viewed: 20 (5 ULg)
See detailLegal presumptions of fault in the wake of the transposition of Directive 2014/104/EU
Van Cleynenbreugel, Pieter ULg

Scientific conference (2017, June 14)

This paper looks at the role played by legal presumptions in the transposition of the directive on damages and whether this differs from the use of legal presumptions in other contexts of EU competition ... [more ▼]

This paper looks at the role played by legal presumptions in the transposition of the directive on damages and whether this differs from the use of legal presumptions in other contexts of EU competition law enforcement. [less ▲]

Detailed reference viewed: 29 (1 ULg)
Peer Reviewed
See detailProbing single molecules with the AFM: Force, motion, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2017, June 14)

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailCohesive Band Model: a triaxiality-dependent cohesive model inside an implicit non-local damage to crack transition framework
Leclerc, Julien ULg; Wu, Ling ULg; Nguyen, Van Dung ULg et al

Conference (2017, June 14)

Accurate numerical prediction of the whole ductile failure process is still a challenge. The adequate numerical scheme has to concord with the physical reality composed of an initial diffuse damage step ... [more ▼]

Accurate numerical prediction of the whole ductile failure process is still a challenge. The adequate numerical scheme has to concord with the physical reality composed of an initial diffuse damage step followed by ultimate localised crack initiation and propagation. Currently, two main modelling philosophies exist. On the one hand, continuous approaches, described by damage models, are suited for diffuse damage, but are unable to represent physical discontinuities. On the other hand, discontinuous approaches are suitable to describe crack propagation behaviour and other localised processes, but fail in diffuse damage prediction of ductile materials. Moreover, they do not usually capture triaxiality effects or in other words, in-plane stretch effects, which are mandatory for accurate ductile failure simulations. To describe the ductile failure process, the numerical scheme proposed here combines both approaches and by this way, their respective advantages: an implicit non-local damage model combined with an extrinsic cohesive law in a discontinuous Galerkin finite element framework [1]. An application example of this scheme is shown on the attached figure with a comparison of the experimental force-displacement curve [2]. An implicit non-local model [3] is involved to model the initial diffuse damage stage. Upon damage to crack transition, a cohesive band [4] is used as cohesive law in order to introduce in-plane stretch effects during the crack propagation. This model is based on the assumption that all the damaging process occurs inside a band of small but finite thickness ahead of the crack surface. The strains inside this band is obtained from the neighbouring strains and from the cohesive jump. Then, the stress-state inside the band and the cohesive traction forces on the crack lips are deduced from the underlying continuum damage model. The band thickness is not a new material parameter but it is computed to ensure the energetic consistency of the numerical scheme [5]. [1] Wu L, Becker G, Noels L. Elastic damage to crack transition in a coupled non-local implicit discontinuous Galerkin/extrinsic cohesive law framework. Comput. Methods Appl. Mech. Eng. 279 (2014): 379–409 [2] Geers M., de Borst R., Brekelmans W., Peerlings R. Validation and internal length scale determination for a gradient damage model: application to short glass-fibre-reinforced polypropylene. Int. J. of Sol. and Struct. 36 (1999): 2557‑2583. [3] Peerlings R., de Borst R., Brekelmans W., Ayyapureddi S. Gradient-enhanced damage for quasi-brittle materials, Int. J. for Num. Methods in Eng. 39 (1996): 3391-3403 [4] Remmers J. J. C., de Borst R., Verhoosel C. V., Needleman A. The cohesive band model: a cohesive surface formulation with stress triaxiality. Int. J. Fract. 181 (2013): 177–18 [5] Leclerc J., Wu L., Nguyen V.D., Noels L. Cohesive band model: a cohesive model with triaxiality for crack transition in a coupled non-local implicit discontinuous Galerkin/extrinsic cohesive law framework. Int. J. for Num. Methods in Eng. (2017): In preparation. [less ▲]

Detailed reference viewed: 26 (3 ULg)
See detailJavier Cercas, Le mobile
Licata, Nicolas ULg

E-print/Working paper (2017)

Synopsis d'une nouvelle de Javier Cercas intitulée Le mobile (1987), rédigé dans le cadre du dossier "Les lectures pour l'été 2017" de la revue Culture.

Detailed reference viewed: 31 (5 ULg)
Full Text
Peer Reviewed
See detailBody shape convergence driven by small size optimum in marine angelfishes
Frederich, Bruno ULg; Santini, Francesco; Konow, Nicolai et al

in Biology Letters (2017), 13

Convergent evolution of small body size occurs across many vertebrate clades and may reflect an evolutionary response to shared selective press- ures. However it remains unclear if other aspects of ... [more ▼]

Convergent evolution of small body size occurs across many vertebrate clades and may reflect an evolutionary response to shared selective press- ures. However it remains unclear if other aspects of phenotype undergo convergent evolution in miniaturized lineages. Here we present a comparative analysis of body size and shape evolution in marine angelfishes (Pomacanthidae), a reef fish family characterized by repeated transitions to small body size. We ask if lineages that evolve small sizes show convergent evolution in body shape. Our results reveal that angelfish lineages evolved three different stable size optima with one corresponding to the group of pygmy angelfishes (Centropyge). Then, we test if the observed shifts in body size are associated with changes to new adaptive peaks in shape. Our data suggest that independent evolution to small size optima have induced repeated convergence upon deeper body and steeper head profile in Centropyge. These traits may favour manoeuvrability and visual aware- ness in these cryptic species living among corals, illustrating that functional demands on small size may be related to habitat specialization and predator avoidance. The absence of shape convergence in large marine angelfishes also suggests that more severe requirements exist for small than for large size optima. [less ▲]

Detailed reference viewed: 27 (2 ULg)
See detailAnalyse qualitative et méthodes (a)preceptives
Englebert, Jérôme ULg

Scientific conference (2017, June 13)

Detailed reference viewed: 51 (3 ULg)
Full Text
See detailModulation strategies of integrated HVAC systems used in residential buildings for demand-side management at different scales
Georges, Emeline ULg

Doctoral thesis (2017)

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, to ensure grid ... [more ▼]

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, to ensure grid balancing, there is a rising need for flexibility, both on the supply and demand sides. A possible solution to help achieve grid balancing is the smart modulation of the electrical load in a "demand following supply" scheme through demand-side management. In this context, the objective of this doctoral thesis is to assess the amount of flexibility that can be harvested from the management of residential thermostatically-controlled loads and, in particular, through the use of heat pumps and storage. To that end, a modeling and control framework is developed to define efficient and scalable optimal load modulation strategies. The flexibility potential is investigated in different contexts: day-ahead electricity market, matching of decentralized electricity production and provision of ancillary services. Different scales are considered, from a single building to several thousand buildings. [less ▲]

Detailed reference viewed: 38 (8 ULg)