Last 7 days
Bookmark and Share    
Full Text
See detailRaison dialectique ou raison tragique ? Sartre, Lévi-Strauss, Goldmann
Delruelle, Edouard ULg

Scientific conference (2015, May 21)

Detailed reference viewed: 6 (3 ULg)
Full Text
See detailCombining remote sensing and ancillary data to improve species distribution models
Delangre, Jessica ULg; Radoux, Julien; Jacquemin, Floriane ULg et al

Poster (2015, May 21)

Correlative distribution models are increasingly used in biological conservation. They often require the compilation of various environmental attributes (climate, topography, land cover,…), which can be ... [more ▼]

Correlative distribution models are increasingly used in biological conservation. They often require the compilation of various environmental attributes (climate, topography, land cover,…), which can be very time-consuming. In the Lifewatch project, a database combining segmentation in homogeneous landscape units (“ecotopes”) and environmental attributes derived from regularly updated remote sensing data (land cover, potential solar energy,…) and other data sources (climate, topography,…) has been designed. Our aim was to assess the usefulness of this database for species distribution modelling and to propose further improvements. The distribution of ten species (four butterflies, three birds, two reptiles and one mammal) was modelled across Wallonia and model performance was assessed by Area Under the ROC Curve using the subsample approach. The models derived from ecotope segmentation and quantitative land cover attributes were compared to those obtained with a corresponding grid and a qualitative land cover database. The usefulness of ancillary data (soil properties, contextual attributes) was assessed to decide which variables should be integrated in the ecotope database. The results allowed us to assess and improve the relevance and accuracy of our database, which is a promising tool for species distribution modellers at the European scale. [less ▲]

Detailed reference viewed: 41 (3 ULg)
Full Text
See detailLe réseau scientifique wallon Agriculture - changement climatique
Minet, Julien ULg

Scientific conference (2015, May 20)

Detailed reference viewed: 13 (0 ULg)
See detailQuelles stratégies africaines face aux émergents?
Mputu Ingole, Jean-Claude ULg

Conference (2015, May 20)

Le rapprochement entre l’Afrique et les pays émergents pose toute une série des questions. Dans cet article, nous voulons nous interroger sur la position africaine face à ces nouveaux acteurs. Le ... [more ▼]

Le rapprochement entre l’Afrique et les pays émergents pose toute une série des questions. Dans cet article, nous voulons nous interroger sur la position africaine face à ces nouveaux acteurs. Le continent africain est-il un acteur conscient des enjeux en cours avec ces nouveaux « partenaires », pour reprendre les termes de l’Union Africaine, ou comme le suggère certains auteurs, elle serait entrain de subir une fois de plus la volonté des acteurs extérieurs ? Car si l’on constate que l’ensemble des pays émergents ont mis en place des nouvelles stratégies africaines, le contraire ne paraît pas évident. Ce papier se propose donc de voir s’il existe une ou plusieurs stratégies africaines vis-à-vis des émergents et si oui, de les analyser dans le contexte d’un monde en pleine mutation avec des nouveaux enjeux. Comment l’Union Africaine fait face aux nouvelles sollicitations des Etats émergents ? Compte-t-elle en tirer profit pour sa propre affirmation comme une actrice qui compte ou bien est-elle marginalisée par les Etats africains qui chacun, en ce qui le concerne, recherche ses propres intérêts. A-t-elle mis en place des nouveaux instruments pour gérer, selon ses intérêts cet accroissement de coopération avec les pays émergents. Quels rôles jouent les organisations régionales et/ou le NEPAD dans le développement de ces nouvelles coopérations ? Car au moment où la croissance africaine est l’une des plus fortes au monde et que le nombre de ses partenaires ne cesse d’augmenter, il est dès lors question de savoir comment l’Afrique se prépare à saisir ces nouvelles opportunités pour renforcer sa présence sur le monde avec ou sans les émergents. [less ▲]

Detailed reference viewed: 21 (4 ULg)
Full Text
See detailBest in translation: Steiner e Eco come revenants
Curreri, Luciano ULg

Learning material (2015)

Detailed reference viewed: 12 (1 ULg)
Full Text
See detailLa coopération Sud-Sud au sein des BRICS ; un nouveau paradigme d’aide au développement? Le cas du Brésil en Mozambique
Cusson, Gabrielle ULg

Conference (2015, May 20)

L’émergence et l’affirmation de nouvelles puissances dites du « Sud », dont celles des BRICS, ont donné un nouveau souffle à la coopération Sud-Sud (CSS), et ce spécialement en Afrique. Ces émergents ... [more ▼]

L’émergence et l’affirmation de nouvelles puissances dites du « Sud », dont celles des BRICS, ont donné un nouveau souffle à la coopération Sud-Sud (CSS), et ce spécialement en Afrique. Ces émergents jouissent d’une marge de manœuvre politique et économique grandissante qui leur permet de multiplier les partenariats Sud-Sud, de contribuer financièrement à la coopération au développement et d’instaurer de nouvelles structures d’institutionnalisation de CSS. La stratégie de CSS des BRICS se veut différente du modèle traditionnel de coopération Nord-Sud (CNS) ; elle s’appuie sur des principes de solidarité, offre une aide sans condition, se base sur des relations horizontales permettant des bénéfices mutuels pour les partenaires. Cependant, la CSS engagée par les BRICS n’est pas exempte de retombées politiques, diplomatiques ou commerciales à leur égard. Dans ce contexte, il est valable de se questionner à savoir si une politique de coopération au développement déployée par une puissance émergente peut être désintéressée et s’il est possible d’établir des relations d’égal à égal alors qu’elle se développe dans un cadre de rapports entre un donateur et un récepteur ? Cette présentation tentera de déterminer si le modèle de CSS soutenu par les BRICS s’inscrit dans un nouveau paradigme pour repenser l’efficacité de l’aide au développement en Afrique ou s’il reproduit la structure d’aide traditionnelle du modèle de CNS. Pour ce faire, nous étudierons le cas de la pénétration brésilienne au Mozambique, soit son implication technique et financière au développement de l’exploitation de certaines cultures à des fins de production de biocarburants. [less ▲]

Detailed reference viewed: 28 (1 ULg)
Full Text
See detailChanges of macrofauna stable isotope compositions in a very inconstant seagrass detritic habitat: actual diet modification or baseline shift?
Remy, François ULg; Mascart, Thibaud ULg; Dauby, Patrick ULg et al

Conference (2015, May 20)

Decayed leaves of the Neptune grass Posidonia oceanica, detached and then exported during storms, constitute an important compartment in terms of organic matter transfer from the seagrass bed to the other ... [more ▼]

Decayed leaves of the Neptune grass Posidonia oceanica, detached and then exported during storms, constitute an important compartment in terms of organic matter transfer from the seagrass bed to the other habitats, particularly coastal habitats. These exported litter accumulations (ELA) support a diverse (more than 130 species) and abundant (up to 4900 id.m-2) vagile macrofauna (invertebrates > 500µm) assemblage which may play a key role in the degradation, enrichment and carbon transfer from P. oceanica dead material to coastal food chains. Indeed, preliminary results of vagile invertebrates gut content observations show that even if only a few of these species ingest a large proportion of P.oceanica dead leaves fragments, most of the others ingest a small but non-negligible part, suggesting a potential role of the whole community in the mechanical fragmentation of the dead leaves. ELA are very dynamic habitats with highly variable food availability, quality, and composition. Such an inconstant habitat may result in drastic modifications of the invertebrate community but also of its trophic structure and ecology. To test this hypothesis of influence of pulsed availability, quality and composition of food sources on the vagile macrofauna diet, we took seasonal samples in Calvi Bay (Corsica, 8°45’E; 42°35’N), at two sites between August 2011 and May 2012. Stable isotopes analysis (C&N) were conducted at an individual level on dominant macrofauna species and mixing and isotopic niche model packages in R were used. Bayesian inference “SIBER” package highlighted significant seasonal and spatial differences of diet at the community, specific and even intraspecific level. Data confirm the potential transfer of seagrass material to animal tissues but in various proportions depending of the species and the season. But one question remained: are these variations reflection a true diet change, or only a spatiotemporal baseline variation of the food sources isotopic composition? “SIAR” Bayesian mixing model showed that it depends on the species and that the two responses co-occur. We emphasized the need to work at the specific level but also with an adequate temporal resolution for sampling to encompass diet and baseline variability. [less ▲]

Detailed reference viewed: 27 (1 ULg)
See detailL’influence normative de la Chine en Amérique latine, un défi stratégique pour l’Union européenne ?
Wintgens, Sophie ULg; Dabène, Olivier

Conference (2015, May 20)

La Chine est aujourd’hui devenue un partenaire commercial incontournable, un important pourvoyeur d’investissements directs étrangers et un grand fournisseur de prêts financiers pour un nombre croissant ... [more ▼]

La Chine est aujourd’hui devenue un partenaire commercial incontournable, un important pourvoyeur d’investissements directs étrangers et un grand fournisseur de prêts financiers pour un nombre croissant de pays d’Amérique latine. L’accroissement de ses échanges économiques et commerciaux avec ce sous-continent va de pair avec l’imposition des normes économiques et politiques dont sa politique commerciale internationale est porteuse. Cet article pose dès lors la question du défi que représente cette influence normative chinoise pour la stratégie déployée par l’Union européenne envers l’Amérique latine. [less ▲]

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailRecent results derived from regular ground-based FTIR observations at the Jungfraujoch and other NDACC stations
Mahieu, Emmanuel ULg; Bader, Whitney ULg; Franco, Bruno ULg

Scientific conference (2015, May 20)

We present an overview of the recent results derived from the observational program for the long-term monitoring of the Earth's atmosphere from the Jungfraujoch station, including comparison with data ... [more ▼]

We present an overview of the recent results derived from the observational program for the long-term monitoring of the Earth's atmosphere from the Jungfraujoch station, including comparison with data from the ACE-FTS satellite instrument and other NDACC stations. [less ▲]

Detailed reference viewed: 11 (3 ULg)
Full Text
See detailCritical analysis and alternative treatment of Type Ia Supernovae data
Hauret, Clémentine ULg

Conference (2015, May 20)

Detailed reference viewed: 15 (6 ULg)
Full Text
See detailLes circuits-courts en alimentation comme réponse au défi climatique
Ozer, Pierre ULg

Conference (2015, May 20)

Detailed reference viewed: 26 (2 ULg)
Full Text
Peer Reviewed
See detailPredicting the non-linear shear behaviour of deep beams based on a two-parameter kinematic model
Mihaylov, Boyan ULg

in Concrete - Innovation and Design, fib Symposium Proceedings, Copenhagen 18 to 20 May 2015 (2015, May 20)

Deep beams are often used as transfer girders in high rise buildings to support heavy loads from discontinuous columns or shear walls. Several buildings with such transfer girders were affected by the ... [more ▼]

Deep beams are often used as transfer girders in high rise buildings to support heavy loads from discontinuous columns or shear walls. Several buildings with such transfer girders were affected by the February 2011 earthquake in Christchurch, New Zealand, which produced very large vertical accelerations and overloaded the transfer girders. One of the buildings had to be stabilized urgently in the hours after the earthquake while others sustained significant damage. The structures which remained standing were those capable of redistributing the forces from the damaged transfer girders to less damaged structural members. The extent of such force redistribution, and therefore the ability of the structure to survive extreme events, depends in part on the displacement capacity and post-peak behaviour of the transfer girders. For this reason, the evaluation of structures with deep transfer girders under extreme loading requires accurate models for predicting the complete non-linear response of the girders. As deep beams usually fail in a brittle manner due to shear, predicting their non-linear behaviour represents a challenging problem even when sophisticated non-linear finite element models are used. This paper will discuss a simpler alternative approach based on a kinematic model for deep beams. The kinematic model describes the deformation patterns of the beam with the help of two degrees of freedom: the average strain along the flexural reinforcement from support to support, and the transverse displacement in the critical zones in the vicinity of the applied loads (critical loading zones). The model assumes that much of the deformations concentrate along a critical diagonal crack which widens and slips as the deflections of the member increase. The equations of the kinematic model are combined with equilibrium equations and constitutive relationships for the load-resisting mechanisms across the critical crack. These mechanisms include diagonal compression in the critical loading zones, aggregate interlock, tension in the stirrups crossing the crack, and dowel action of the longitudinal reinforcement. The complete set of equations is solved iteratively in order to compute the pre- and post- peak response of deep beams. This approach is validated with the help of tests of deep beams. The model will be used to draw conclusions on the effect of the properties of deep beams on their non-linear behaviour. [less ▲]

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailGold nanorods coated with mesoporous silica shell as drug delivery system for remote near infrared light-activated release and potential phototherapy
Liu, Ji; Detrembleur, Christophe ULg; De Pauw-Gillet, Marie-Claire ULg et al

in Small (Weinheim an der Bergstrasse, Germany) (2015), 11(19), 2323-2332

In this study, we report the synthesis of a nanoscaled drug delivery system, which is composed of a gold nanorod-like core and a mesoporous silica shell (GNR@MSNP) and partially uploaded with phase ... [more ▼]

In this study, we report the synthesis of a nanoscaled drug delivery system, which is composed of a gold nanorod-like core and a mesoporous silica shell (GNR@MSNP) and partially uploaded with phase-changing molecules (1-tetradecanol, TD, Tm 39 degrees C) as gatekeepers, as well as its ability to regulate the release of doxorubicin (DOX). Indeed, a nearly zero premature release is evidenced at physiological temperature (37 degrees C), whereas the DOX release is efficiently achieved at higher temperature not only upon external heating, but also via internal heating generated by the GNR core under near infrared irradiation. When tagged with folate moieties, GNR@MSNPs target specifically to KB cells, which are known to overexpress the folate receptors. Such a precise control over drug release, combining with the photothermal effect of GNR cores, provides promising opportunity for localized synergistic photothermal ablation and chemotherapy. Moreover, the performance in killing the targeted cancer cells is more efficient compared with the single phototherapeutic modality of GNR@MSNPs. This versatile combination of local heating, phototherapeutics, chemotherapeutics and gating components opens up the possibilities for designing multifunctional drug delivery systems. [less ▲]

Detailed reference viewed: 58 (12 ULg)