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See detailNew observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN
Stevens, M. H.; Evans, J. S.; Schneider, N. M. et al

in Geophysical Research Letters (2015)

We identify molecular nitrogen (N2) emissions in the Martian upper atmosphere using the Imaging Ultraviolet Spectrograph (IUVS) on NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. We report ... [more ▼]

We identify molecular nitrogen (N2) emissions in the Martian upper atmosphere using the Imaging Ultraviolet Spectrograph (IUVS) on NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. We report the first observations of the N2 Lyman-Birge-Hopfield (LBH) bands at Mars and confirm the tentative identification of the N2 Vegard-Kaplan (VK) bands. We retrieve N2 density profiles from the VK limb emissions and compare calculated limb radiances between 90 and 210km against both observations and predictions from a Mars general circulation model (GCM). Contrary to earlier analyses using other satellite data, we find that N2 abundances exceed GCM results by about a factor of 2 at 130km but are in agreement at 150km. The analysis and interpretation are enabled by a linear regression method used to extract components of UV spectra from IUVS limb observations. © 2015. American Geophysical Union. All Rights Reserved. [less ▲]

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See detailMAVEN IUVS observation of the hot oxygen corona at Mars
Deighan, J.; Chaffin, M. S.; Chaufray, J.-Y. et al

in Geophysical Research Letters (2015)

Observation of the hot oxygen corona at Mars has been an elusive measurement in planetary science. Characterizing this component of the planet's exosphere provides insight into the processes driving loss ... [more ▼]

Observation of the hot oxygen corona at Mars has been an elusive measurement in planetary science. Characterizing this component of the planet's exosphere provides insight into the processes driving loss of oxygen at the current time, which informs understanding of the planet's climatic evolution. The Mars Atmosphere and Volatile EvolutioN (MAVEN) Imaging Ultraviolet Spectrograph (IUVS) instrument is now regularly collecting altitude profiles of the hot oxygen corona as part of its investigation of atmospheric escape from Mars. Observations obtained thus far have been examined and found to display the expected gross structure and variability with EUV forcing anticipated by theory. The quality and quantity of the data set provides valuable constraints for the coronal modeling community. © 2015. American Geophysical Union. All Rights Reserved. [less ▲]

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See detailFondements logiques et phénoménologiques de la rationalité mathématique chez Husserl. Contributions husserliennes au débat sur la « crise des fondements »
Leclercq, Bruno ULg

Book published by Vrin (2015)

Formé en mathématiques par Kronecker et Weierstraß, puis en psychologie par Brentano et Stumpf, évalué par Cantor, critique de Schröder, correspondant de Frege, collègue de Hilbert, maître de Weyl et ... [more ▼]

Formé en mathématiques par Kronecker et Weierstraß, puis en psychologie par Brentano et Stumpf, évalué par Cantor, critique de Schröder, correspondant de Frege, collègue de Hilbert, maître de Weyl et Becker, Edmund Husserl est l’exact contemporain des débats célèbres qui ont opposé positions psychologistes, logicistes, intuitionnistes et formalistes au cours de ce qu’on a appelé la « crise des fondements » des mathématiques. Initié sur le terrain de l’arithmétique, puis très vite confronté à ces « fines fleurs de la mathématique moderne » que sont la théorie des systèmes de nombres, la théorie des géométries de Riemann ou la théorie des groupes de transformation de Lie, son projet phénoménologique vise à rendre compte du type de signification et d’intuitivité que peuvent revendiquer des « objets » dont la connaissance est médiée par leurs rapports rationnels les uns aux autres. Or, après s’être montré sensible aux arguments de ses différents interlocuteurs et avoir ponctuellement adopté certaines de leurs positions, ce sont en définitive des thèses formalistes que Husserl va tout à la fois défendre et s’efforcer d’élucider par des analyses constitutives statiques puis génétiques. [less ▲]

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See detailRaman characterization of the UV-protective pigment gloeocapsin and its role in the survival of cyanobacteria
Storme, Jean-Yves ULg; Golubic, Stjepko; Wilmotte, Annick ULg et al

in Astrobiology (2015), 15(10),

Extracellular UV-screening pigments gloeocapsin and scytonemin present in the EPS envelopes of extremophile cyanobacteria of freshwater and marine environments were studied by Raman spectroscopy and ... [more ▼]

Extracellular UV-screening pigments gloeocapsin and scytonemin present in the EPS envelopes of extremophile cyanobacteria of freshwater and marine environments were studied by Raman spectroscopy and compared to their intracellular photosynthetic pigments. This Raman spectral analysis of the extracellular pigment gloeocapsin showed that it shared Raman spectral signatures with parietin, a radiation-protective pigment known in lichens. The UV-light spectra also showed similarities. Gloeocapsin occurs in some cyanobacterial species, mostly with exclusion of scytonemin, indicating that these pigments have evolved in cyanobacteria as separate protective strategies. Both gloeocapsin and scytonemin are widely and species-specifically distributed in different cyanobacterial genera and families. The widespread occurrence of these pigments may suggest an early origin, while their detection by Raman Spectroscopy makes them potential biosignatures for cyanobacteria in the fossil record and demonstrates the usefulness of non-destructive Raman spectroscopy analyses for the search of complex organics, including possible photosynthetic pigments, if preservable in early Earth and extraterrestrial samples. [less ▲]

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See detailY a-t-il vraiment une ethnologie chez Raynal? L’enfance de l’art américain dans les ‘Deux Indes’
Droixhe, Daniel ULg

in Oxford University Studies in the Enlightenment (2015), 2015:10

Quelle place occupent les arts et plus généralement l’expression artistique dans le relevé que l’Histoire des deux Indes consacre aux ‘moeurs’ des peuples censés témoigner, d’une manière ou d’une autre ... [more ▼]

Quelle place occupent les arts et plus généralement l’expression artistique dans le relevé que l’Histoire des deux Indes consacre aux ‘moeurs’ des peuples censés témoigner, d’une manière ou d’une autre, de ce que furent les ‘enfances de l’humanité’? Cette question est abordée à propos du continent américain, en examinant trois cas où se mêlent des populations conservant un état culturel supposé ‘originel’: Indiens d’Amérique du Sud ou du Canada, et Africains dont la condition d’esclave a fixé à l’étape d’une certaine ‘sauvagerie’ le degré de civilisation. [less ▲]

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See detailSoigner le cancer au XVIIIe siècle. Triomphe et déclin de la thérapie par la ciguë dans le Journal de médecine
Droixhe, Daniel ULg

Book published by Hermann (2015)

En 1761, la Gazette salutaire donnait un article intitulé « De la ciguë ». On y apprenait « que Mr. Storck, célèbre médecin de Vienne (…) avait eu le succès le plus complet de ce remède si nouveau et si ... [more ▼]

En 1761, la Gazette salutaire donnait un article intitulé « De la ciguë ». On y apprenait « que Mr. Storck, célèbre médecin de Vienne (…) avait eu le succès le plus complet de ce remède si nouveau et si inattendu, pour fondre différentes sortes de tumeurs ». Störck « croyait même pouvoir se flatter de triompher, par son moyen, du mal le plus cruel et le plus opiniâtre de tous, du cancer». Il venait de publier un Petit livre qui montre que la ciguë peut non seulement être utilisée en interne, mais aussi qu’elle constitue en même temps un remède très utile dans de nombreuses maladies réputées impossibles à guérir. On inscrit la « découverte » de Störck dans les archives du traitement par la ciguë et dans « l’horizon d’attente » suscité par des expériences de traitement du cancer au moyen de la belladone. On analyse la « machine d’accréditation » mise en oeuvre. On considère les dizaines d’ « Observations » adressées au Journal de médecine, du « temps de la découverte » à l’époque des doutes et des échecs. On s’attache au traitement du cancer du sein, à quelques « oncologues » du 18e siècle, au cas du cancer chez les religieuses, à la circulation du « levain cancéreux » et à la question de la naissance de la clinique selon Michel Foucault. [less ▲]

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See detailAgriculture and climate change : challenges and solutions
Mergeai, Guy ULg

in Tropicultura (2015), 33(3), 161-162

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See detailMetamemory Following Childhood Brain Injury: A Consequence of Executive Impairment
Geurten, Marie ULg; Chevignard, Mathilde; Kerrouche, Bernadette et al

in Child Neuropsychology : A Journal on Normal & Abnormal Development in Childhood & Adolescence (2015)

In this study, we investigated the influence of children’s level of executive functioning on two types of metamemory knowledge following a traumatic brain injury (TBI). For this purpose, 22 children (aged ... [more ▼]

In this study, we investigated the influence of children’s level of executive functioning on two types of metamemory knowledge following a traumatic brain injury (TBI). For this purpose, 22 children (aged 7 to 14 years) who had sustained a moderate to severe TBI and 44 typically developing children were recruited. Children with TBI were divided into two groups according to the severity of their executive impairment. Injury severity was determined by the Glasgow Coma Scale (GCS) score on admission or by the duration of unconsciousness. All children were then tested on both their knowledge of general memory functioning and their level of memory self-awareness, respectively assessed using total number of correct responses on an adapted version of Kreutzer et al.’s metamemory interview and a self-other discrepancy score on a questionnaire evaluating everyday memory abilities. Data analyses revealed that participants with TBI who suffered impaired executive functions demonstrated less general metamemory knowledge, and underestimated the frequency of their memory problems, compared with children with TBI who had preserved executive functions and with control participants. Considering the well-established effect of metamemory knowledge on people’s spontaneous implementation of strategies, the interest and the importance of these findings on both theoretical and clinical grounds are discussed. [less ▲]

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See detailLogique formelle et argumentation, seconde édition revue et corrigée
Bouquiaux, Laurence ULg; Leclercq, Bruno ULg

Book published by De Boeck (2015)

Science de la pensée rationnelle, la logique s’est donné pour tâche de dégager les grands principes théoriques permettant de distinguer les raisonnements corrects des raisonnements fallacieux. Au cours de ... [more ▼]

Science de la pensée rationnelle, la logique s’est donné pour tâche de dégager les grands principes théoriques permettant de distinguer les raisonnements corrects des raisonnements fallacieux. Au cours de son histoire, elle a forgé des outils d’analyse de plus en plus précis et rigoureux. Ces développements ont abouti aux divers systèmes formels de la logique symbolique dont nous disposons aujourd’hui. Il est désormais possible de traiter de nombreux raisonnements comme de calculs dont la validité est assurée par le seul respect de règles d’inférence préalablement établies. La question de la légitimité de nos argumentations quotidiennes suppose cependant que l’on prenne également en compte des critères qui relèvent d’autres dimensions – dialectique, topique, rhétorique ou linguistique – de l’argumentation. C’est en se fondant sur l’ensemble de ces analyses que l’on peut évaluer l’usage en contexte de tel ou tel schéma d’inférence et déterminer, par des questions critiques, s’il fait l’objet d’une utilisation globalement rationnelle ou d’un abus sophistique. Parce qu’il envisage l’étude des raisonnements sous ces différents aspects, ce livre constitue une véritable introduction générale à la logique. L’approche choisie est délibérément pédagogique. L’ouvrage analyse plus de 280 raisonnements et propose au lecteur 360 exercices dont les corrigés sont disponibles en ligne. [less ▲]

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See detailSoil - the Key to our Future
Mergeai, Guy ULg

in Tropicultura (2015), 33(2), 65-66

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See detailTesting the proportional odds assumption in multiply imputed ordinal longitudinal data
Donneau, Anne-Françoise ULg; Mauer, M; Lambert, Philippe ULg et al

in Journal of Applied Statistics (2015), 42(10), 2257-2279

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See detailLa coopération Sud-Sud : le cas de la Chine en Afrique et en Amérique latine
Wintgens, Sophie ULg; Zacharie, Arnaud

in Zacharie, Arnaud (Ed.) La nouvelle géographie du développement. Coopérer dans un monde en mutation (2015)

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See detailOne shot learning and generation of dexterous grasps for novel objects
Kopicki, Marek; Detry, Renaud ULg; Adjigble, Maxime et al

in International Journal of Robotics Research (2015)

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See detailSynthetic biology as a new threat to biosecurity. Is there a road to suitable governance?
Colussi, Ilaria Anna ULg

in Romeo Casabona, Carlos Maria (Ed.) Bioterrorismo y bioseguridad (2015)

Synthetic biology, which is a new emerging technology aiming at re-writing existing biological systems and designing completely new parts and devices, brings several potential benefits, but at the same ... [more ▼]

Synthetic biology, which is a new emerging technology aiming at re-writing existing biological systems and designing completely new parts and devices, brings several potential benefits, but at the same time it constitutes a new threat to biosecurity: for such “double Janus face”, it can be considered as a “dual use research”. Indeed, the risk that its theoretical discoveries and applications are handled by bioterrorists and used for malevolent purposes is not a mere hypothesis. Therefore, it is necessary to look for possible solutions for the governance of this type of risk. In order to try to achieve such purpose, the analysis focuses, first of all, on the overview of the existing regulations against bioterrorism. Then, these regulations are evaluated in the light of the constitutional frame of fundamental rights at stake (in the belief that any policy/regulation should take into account and be based on the respect of fundamental rights). Thirdly, the applicability of the existing regulatory framework to synthetic biology is checked. Fourthly, the different positions that have been proposed so far for addressing biosecurity risks in the area of synthetic biology are shown and put into comparison. Finally, the proposal of a model of governance, called of “prudent vigilance”, is described. [less ▲]

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See detailMeliponini and Apini in Africa (Apidae: Apinae): a review on the challenges and stakes bound to their diversity and their distribution
Fabre Anguilet, Edgard ULg; Nguyen, Bach Kim ULg; Bengone Ndong, Toussaint et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2015), 19(4),

Introduction. Meliponini and Apini contribute to the pollination of flowering plants and to improving agricultural yields. These bees’ diversity, distribution and abundance depend on the ecosystem in ... [more ▼]

Introduction. Meliponini and Apini contribute to the pollination of flowering plants and to improving agricultural yields. These bees’ diversity, distribution and abundance depend on the ecosystem in which they evolve. The present work aims to summarize the diversity, distribution, abundance, potential threats, challenges and issues faced with respect to these social bees in Africa. Literature. In Africa, there were 21 species of Meliponini and 2 species of Apini (Apis). Aspects related to the species diversity, distribution, biology, ecology and abundance of nests are poorly documented, especially for Meliponini. This deficit could be related to a lack of interest of the authors or the various difficulties in performing these studies in Africa. With regard to the difficulties, there is a need to clarify the taxonomy of Meliponini, and the observation of nests in certain forest environments is difficult. Nest predation and habitat loss are the main threats that could cause the depopulation of certain social bee species in Africa. If there is currently new evidence that diseases and pests did not endanger these bees, then there is a need for further studies for better assessment of the risks that are associated with these potential threats. Conclusions. Work on the diversity, distribution and abundance of the social bees must be strengthened to address the challenges that are related to these insects in Africa. Indeed, this approach will contribute to answering the challenges of sustainable management of the biodiversity and economic and agricultural issues. [less ▲]

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See detailCorneille, bâtard de Bourgogne (ca 1426-1452)
Marchandisse, Alain ULg

in Bousmar, Éric; Marchandisse, Alain; Masson, Christophe (Eds.) et al La bâtardise et l'exercice du pouvoir en Europe du XIIIe au début du XVIe siècle (2015)

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See detailVII.15 Cahier de texte et reliure [manuscrit arabe MRAH I.S. 5007]
Franssen, Elise ULg

in van Raemdonck, Mieke (Ed.) En Harmonie. Art du monde islamique aux Musées Royaux d’Art et d’Histoire de Bruxelles (2015)

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See detailFuzzy boundaries, fuzzy syntax. Quelques réflexions sur le progressif et d'autres constructions en néo-égyptien
Winand, Jean ULg

in Amstutz, A.; Dorn, Andreas; Müller, Matthias (Eds.) et al Fuzzy Boundaries. Festschrift für Antonio Loprieno (2015)

Detailed reference viewed: 45 (3 ULg)