References of "Scientific congresses and symposiums"      in Complete repository Arts & humanities   Archaeology   Art & art history   Classical & oriental studies   History   Languages & linguistics   Literature   Performing arts   Philosophy & ethics   Religion & theology   Multidisciplinary, general & others Business & economic sciences   Accounting & auditing   Production, distribution & supply chain management   Finance   General management & organizational theory   Human resources management   Management information systems   Marketing   Strategy & innovation   Quantitative methods in economics & management   General economics & history of economic thought   International economics   Macroeconomics & monetary economics   Microeconomics   Economic systems & public economics   Social economics   Special economic topics (health, labor, transportation…)   Multidisciplinary, general & others Engineering, computing & technology   Aerospace & aeronautics engineering   Architecture   Chemical engineering   Civil engineering   Computer science   Electrical & electronics engineering   Energy   Geological, petroleum & mining engineering   Materials science & engineering   Mechanical engineering   Multidisciplinary, general & others Human health sciences   Alternative medicine   Anesthesia & intensive care   Cardiovascular & respiratory systems   Dentistry & oral medicine   Dermatology   Endocrinology, metabolism & nutrition   Forensic medicine   Gastroenterology & hepatology   General & internal medicine   Geriatrics   Hematology   Immunology & infectious disease   Laboratory medicine & medical technology   Neurology   Oncology   Ophthalmology   Orthopedics, rehabilitation & sports medicine   Otolaryngology   Pediatrics   Pharmacy, pharmacology & toxicology   Psychiatry   Public health, health care sciences & services   Radiology, nuclear medicine & imaging   Reproductive medicine (gynecology, andrology, obstetrics)   Rheumatology   Surgery   Urology & nephrology   Multidisciplinary, general & others Law, criminology & political science   Civil law   Criminal law & procedure   Criminology   Economic & commercial law   European & international law   Judicial law   Metalaw, Roman law, history of law & comparative law   Political science, public administration & international relations   Public law   Social law   Tax law   Multidisciplinary, general & others Life sciences   Agriculture & agronomy   Anatomy (cytology, histology, embryology...) & physiology   Animal production & animal husbandry   Aquatic sciences & oceanology   Biochemistry, biophysics & molecular biology   Biotechnology   Entomology & pest control   Environmental sciences & ecology   Food science   Genetics & genetic processes   Microbiology   Phytobiology (plant sciences, forestry, mycology...)   Veterinary medicine & animal health   Zoology   Multidisciplinary, general & others Physical, chemical, mathematical & earth Sciences   Chemistry   Earth sciences & physical geography   Mathematics   Physics   Space science, astronomy & astrophysics   Multidisciplinary, general & others Social & behavioral sciences, psychology   Animal psychology, ethology & psychobiology   Anthropology   Communication & mass media   Education & instruction   Human geography & demography   Library & information sciences   Neurosciences & behavior   Regional & inter-regional studies   Social work & social policy   Sociology & social sciences   Social, industrial & organizational psychology   Theoretical & cognitive psychology   Treatment & clinical psychology   Multidisciplinary, general & others     Showing results 901 to 1000 of 36462     5 6 7 8 9 10 11 12 13 14 15     Changement climatique et priorités des acteurs politiques belges. Un même objectif, une argumentation différente?Piet, Grégory Conference (2014, March 31)Detailed reference viewed: 28 (3 ULg) Complex regulation of the FRD3 gene in Arabidopsis relativesCharlier, Jean Benoit; Polese, Catherine ; Nouet, Cécile et alPoster (2014, March 31)Detailed reference viewed: 17 (5 ULg) Polymethylmethacrylate (PMMA) augmentation of the pedicle screws in patients with fractures of osteoporotic bone. About our experience.HENROTEAUX, Adrienne ; RACARU, Tudor ; Martin, Didier et alConference (2014, March 29)Detailed reference viewed: 19 (0 ULg) Apport des examens biologiques en pratique allergologiqueGADISSEUR, Romy Conference (2014, March 29)Apport des examens biologiques en pratique allergologiqueDetailed reference viewed: 15 (5 ULg) L'impact de la charge vocale sur la rééducationMorsomme, Dominique ; REMACLE, Angélique Conference (2014, March 29)Detailed reference viewed: 30 (6 ULg) L'Analyse des sensations est-elle aussi une psychologie de la forme? Pour une réévaluation du monisme neutre d'Ernst MachZincq, Aurélien Conference (2014, March 29)Detailed reference viewed: 14 (2 ULg) From the Gymnasium to the Agora: Hermes and his Cult-EpithetsPaul, Stéphanie Conference (2014, March 29)Detailed reference viewed: 11 (1 ULg) Glioma metastatis : a case series and reviewREUTER, Gilles ; LOMBARD, Arnaud ; SCHOLTES, Félix et alPoster (2014, March 29)Detailed reference viewed: 21 (1 ULg) Le jeu des enfants placés en institution: Observation des jeux et non-jeux chez les enfants de 5 à 8 ansDegraux, Christine ; Gauthier, Jean-Marie ; Blavier, Adelaïde Poster (2014, March 29)Detailed reference viewed: 42 (5 ULg) La charge vocaleREMACLE, Angélique ; Morsomme, Dominique Conference (2014, March 29)Detailed reference viewed: 30 (3 ULg) Intermediaries, transport costs and interlinked transactionTharakan, Joseph Conference (2014, March 28)Detailed reference viewed: 8 (0 ULg) Van het klassieke China naar het moderne Amsterdam: oosterse invloeden in de poëzie van Hans FavereyDieu, Véronique Conference (2014, March 27)That a modern Dutch poet should have found inspiration in Classical Chinese poetry and philosophy may seem rather unlikely. Yet, the contents of his personal library and a number of statements made in ... [more ▼]That a modern Dutch poet should have found inspiration in Classical Chinese poetry and philosophy may seem rather unlikely. Yet, the contents of his personal library and a number of statements made in interviews reveal how Hans Faverey (1933-1990) had a great interest in oriental literature, art and thought (especially Taoism and Buddhism). Although many articles have been devoted to the use and function of intertext in Faverey’s poetry, scant attention has been paid to the possible influence of Chinese philosophers and poets on his work. I will argue that Faverey’s obsession with themes like emptiness, stillness and silence may be interpreted as an attempt to integrate some fundamental Taoist and Buddhist ideas into his writing. Taking Faverey’s oriental library as my starting point, and contextualizing it with reference to Tang dynasty poets such as Wang Wei and Li Shang-Yin, and quotations from Kung Sun Lung and the School of Names, I aim to shed a clearer light on those possible connections. The first part of my paper will focus on a number of general concepts from Chinese literature and philosophy, and discuss how Faverey assimilated these concepts into his own poems. The second part of my presentation will be devoted to a comparison between the Tao as text and a selection of Faverey’s work in order to highlight possible parallels in their use of symbols and imagery. Since Faverey, as a poet, was constantly working with and thinking about the written word, he may have been struck not only by Chinese philosophy itself but also by the way in which these thoughts had found their expression in language. The structure of the Chinese language and its penchant for paradoxical turns of phrase may have held an additional appeal for the Amsterdam poet, renowned for his pithy, hermetic writing style that abounds in paradoxes and uncommon allusions. [less ▲]Detailed reference viewed: 11 (1 ULg) Le "champ" de l'accompagnement des demandeurs d'emploi est-il un "marché"?Remy, Céline ; Orianne, Jean-François Conference (2014, March 27)Detailed reference viewed: 9 (0 ULg) «More powerful than anyone in matters of state»: the Prince’s confessor, an exceptional adviserPirlet, Pierre-François Conference (2014, March 27)Detailed reference viewed: 14 (3 ULg) Programming of neuroendocrine self-tolerance in the thymus and its defect in the development of neuroendocrine autoimmunityGeenen, Vincent Conference (2014, March 27)The thymus may be compared to a computer highly specialized in the programming of central immunological self-tolerance. A unique thymus first appeared some 500 million years ago in cartilaginous fishes ... [more ▼]The thymus may be compared to a computer highly specialized in the programming of central immunological self-tolerance. A unique thymus first appeared some 500 million years ago in cartilaginous fishes, at the same time or shortly after the emergence of the adaptive immune system. A new paradigm of neuroendocrine self-peptides has been proposed, together with the definition of neuroendocrine self. Neuroendocrine self-peptides are secreted by thymic epithelial cells (TECs) not according to the classic model of neurosecretion, but are processed for presentation by the thymic major histocompatibility complex (MHC) machinery. The autoimmune regulator (AIRE) gene/protein controls the transcription of neuroendocrine genes in TECs. Presentation of neuroendocrine self-peptides in the thymus is responsible for the clonal deletion of self-reactive T cells directed toward neuroendocrine antigens, which emerge during the random recombination of gene segments encoding variable parts of the T cell receptor for the antigen (TCR). Quite paradoxically, neuroendocrine self-peptide presentation in the thymus also generates regulatory T (tTreg) cells that inhibit, in the periphery, those self-reactive T cells having escaped thymic negative selection. Several arguments indicate that the origin of autoimmunity directed against neuroendocrine glands results from a primary defect in the intrathymic programming of self-tolerance to neuroendocrine principles. This defect may be genetic or acquired, for example during a viral infection. This novel knowledge of normal and pathologic functions of the thymus constitutes a solid scientific basis for the development of a novel type negative self-vaccination against type 1 diabetes. (Supported by NFSR of Belgium, Wallonia and FP6 Eurothymaide.) [less ▲]Detailed reference viewed: 21 (0 ULg) Quaternary rainforests of the Northern Congo Basin: contribution of charcoal analysisMorin-Rivat, Julie ; Bremond, Laurent; Gillet, Jean-François et alConference (2014, March 27)In comparison with the wood charcoals uncovered in the soils of the temperate regions, charcoals from the tropical regions remain little studied yet, in particular those from the dense humid forests of ... [more ▼]In comparison with the wood charcoals uncovered in the soils of the temperate regions, charcoals from the tropical regions remain little studied yet, in particular those from the dense humid forests of Central Africa. Here we aim at showing the interest of the analysis of soil charcoals so as to understand the current environments through some examples of taxonomical identifications conducted on charcoals sampled in several soil pits in Cameroon and in the Republic of the Congo. These charcoals were hand-split then observed under an incident light microscope. The anatomical features that are hold in the charcoals and described according to a standard method were compared to wood samples from the reference collection of the RMCA. Results demonstrated that the identified species are still present in the vegetal environment today and that only limited changes occurred over the past two millennia. Charcoal analysis can thus allow a better understanding of the past history of the forests in relationship with the ancient disturbances. The temporal and spatial framework of human settlements as well as the impact of the colonial period on the evolution of the forest is also discussed. [less ▲]Detailed reference viewed: 74 (5 ULg) Âgisme et jeunisme : conséquences trop méconnues …!Adam, Stéphane Conference (2014, March 27)Detailed reference viewed: 12 (0 ULg) Spanish Saints in the Spanish NetherlandsDelfosse, Annick Conference (2014, March 27)In the seventeenth century, the Roman proclamations of beatification or canonization generated a large number of festivities and spectacular events in many parts of the Monarchy of Spain. Yet, in the ... [more ▼]In the seventeenth century, the Roman proclamations of beatification or canonization generated a large number of festivities and spectacular events in many parts of the Monarchy of Spain. Yet, in the Netherlands, they received a fainter echo and left a limited number of sufficiently documented testimonies. Two cases, however, are exceptions: the canonization of Ignatius of Loyola and Francis Xavier triumphantly celebrated by the Belgian Jesuits in 1622, and the beatification of Francisco Borgia in 1624, i.e., the elevation to the Catholic pantheon of three Spanish saints rejoiced by an order marked by its hispanophile nature, in provinces recently returned to the Spanish Crown. I will seek to define the Hispanic features of these events and I will particularly stress the very noticeable way how the Spanish communities, present in the Low Countries, committed themselves in these festivities. [less ▲]Detailed reference viewed: 10 (2 ULg) Négociations inachevées et micropolitique : le nonce à Paris et l’internonce à Bruxelles, artisans de la recherche d’une paix entre la France et l’Espagne (1648-1650)Regibeau, Julien Conference (2014, March 26)Detailed reference viewed: 14 (3 ULg) International Law's Belgian Jurists and WWI. Cosmopolitanism of an Elite, Globalization of a Country (Montreal International Colloquium, March 2014)Genin, Vincent Conference (2014, March 26)Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary ... [more ▼]Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary project “commemorating WWI” launched by the Fédération Wallonie-Bruxelles (French Community), the Steering Group of which is led by Professor Laurence Van Ypersele (Université Catholique de Louvain). The research focuses on the following topic: Experiences and remembrance of Belgian jurists on issues of international law during the First World War (1914-1918). Belgium, that had been neutral since its independence in 1831, soon became an active reflection centre and a land of innovation for international law, as shown by the foundation of the Institute of International Law (IDI) in Ghent in 1873. Belgium’s neutrality was violated in August 1914 and its territory, the only one, was occupied at 90% by the Germans, putting the country in a unique position that encouraged its International Law experts to revise their practices in view of their experiences and their remembrance of war. As a matter of fact, between 1918 and 1940, they held a prominent position on a global scale (LN, etc.). How the field of these law experts, its practices, its networks (European/American) and its international influence (1873-1940) evolved as a result of WWI lies at the heart of our thesis. [less ▲]Detailed reference viewed: 43 (9 ULg) Valuation and price expectation mismatch in SME business transferLambert, Marie Conference (2014, March 26)Detailed reference viewed: 21 (7 ULg) A new multifractal formalism based on wavelet leaders : detection of non concave and non increasing spectra (Part I)Esser, Céline ; Kleyntssens, Thomas ; Nicolay, Samuel et alConference (2014, March 25)Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to ... [more ▼]Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to determine the spectrum of singularities of the signal, which is the Hausdorff dimension of the set of points which have the same Hölder exponent. The spectrum of singularities of many mathematical functions can be determined directly from its definition. However, for many real-life signals, the numerical determination of their Hölder regularity is not feasible. Therefore, one cannot expect to have a direct access to their spectrum of singularities and one has to find an indirect way to compute it. A multifractal formalism is a formula which is expected to yield the spectrum of singularities from quantities which are numerically computable. Several multifractal formalisms based on the wavelet coefficients of a signal have been proposed to estimate its spectrum. The most widespread of these formulas is the so-called thermodynamic multifractal formalism, based on the Frish-Parisi conjecture. This formalism presents two drawbacks: it can hold only for spectra that are concave and it can yield only the increasing part of the spectrum. This first problem can be avoided using Snu spaces. The second one can be avoided using a formalism based on wavelet leaders of the signal. In this talk, we propose a new multifractal formalism, based on a generalization of the Snu spaces using wavelet leaders. It allows to detect non concave and non increasing spectra. An implementation of this method is presented in the talk "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)" of T. Kleyntssens. [less ▲]Detailed reference viewed: 20 (10 ULg) Agisme : quelles conséquences pour nos aînés?Schroyen, Sarah ; Marquet, Manon Conference (2014, March 25)Detailed reference viewed: 17 (2 ULg) A multifractal-based climate analysisDeliège, Adrien ; Nicolay, Samuel Conference (2014, March 25)This work consists of a multifractal analysis of surface air temperature in Western and Eastern Europe. The wavelet leaders method enables us to exhibit the monofractal nature of these signals. Then, we ... [more ▼]This work consists of a multifractal analysis of surface air temperature in Western and Eastern Europe. The wavelet leaders method enables us to exhibit the monofractal nature of these signals. Then, we define a climate classification relying on the Zygmund-Hölder spaces and show that it matches the Köppen classification. By doing so, we evidence the existing relation between the regularity of the temperature data (obtained through functional spaces) and the type of climate. Finally, we give a climatic interpretation of these results. [less ▲]Detailed reference viewed: 32 (20 ULg) Compact quadratizations of nonlinear binary optimization problemsCrama, Yves ; Rodriguez Heck, Elisabeth Conference (2014, March 25)Detailed reference viewed: 25 (6 ULg) A Weak Local Irregularity Property in $S^\nu$ spacesClausel, Marianne; Nicolay, Samuel Conference (2014, March 25)Detailed reference viewed: 12 (4 ULg) A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)Kleyntssens, Thomas ; Esser, Céline ; Nicolay, Samuel Conference (2014, March 25)This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to ... [more ▼]This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to compute the spectrum of singularities by using its definition. A multifractal formalism is used to approximate this spectrum. We present a new multifractal formalism for non concave and non increasing spectra based on wavelet leaders. In this talk, an implementation of this formalism is given and several numerical examples are presented. [less ▲]Detailed reference viewed: 31 (12 ULg) Inflorescence development in tomato: linking gene function with a zigzag modelLobet, Guillaume ; Périlleux, Claire ; Tocquin, Pierre Conference (2014, March 25)Detailed reference viewed: 5 (0 ULg) About the Multifractal Nature of Cantor's BijectionSimons, Laurent ; Nicolay, Samuel Conference (2014, March 25)In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal ... [more ▼]In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal nature of this map. This talk is based on a joint work with S. Nicolay. [less ▲]Detailed reference viewed: 17 (3 ULg) Règlement Successions (650/2012) - aperçu généralWautelet, Patrick Conference (2014, March 24)This presentation gives a very general overview of the main principles on which the Succession Regulation is based.Detailed reference viewed: 16 (1 ULg) The cultural politics of labor in post-socialist China: the case of subject formation and identity politics of peasant workersFlorence, Eric Conference (2014, March 22)Detailed reference viewed: 18 (0 ULg) MSC in clinics: Liver TransplantationDETRY, Olivier Conference (2014, March 21)For several years, mesenchymal stem cells (MSC) have been evaluated in vivo and in vitro for their immunomodulatory, anti-inflammatory, anti- ischemia-reperfusion injury and “tissue repair” properties ... [more ▼]For several years, mesenchymal stem cells (MSC) have been evaluated in vivo and in vitro for their immunomodulatory, anti-inflammatory, anti- ischemia-reperfusion injury and “tissue repair” properties. These characteristics could make them interesting in various clinical applications, and particularly in organ transplantation. Taking advantage of our centre expertise and experience concerning MSC use in graft-versus-host disease after bone marrow transplantation and using already functioning GMP-compliant laboratory able to produce clinical-grade MSC, we initiated in 2011 a first trial exploring safety and tolerability of third party MSC infusions after kidney or liver transplantation in a prospective phase I-II study. In this study, after successful transplantation, 10 liver and 10 kidney transplant recipients under standard immunosuppressive treatment (tacrolimus, mycophenolate, steroids) receive an intravenous infusion of 1.5 - 3x106/kg of third-party MSC, on post-operative day 3+/-2. These patients are prospectively compared to the same number of liver and kidney transplant recipients who meet inclusion criteria but do not receive MSC infusion. Safety is assessed by recording side effects, including opportunistic infections and cancers. Immunosuppressive potential is evaluated by rejection episode rates, graft/patient survivals, immunohistology of 3-month (kidney) and 6-month (liver) graft biopsies, and in vitro evaluation of recipient immunity profile. In a second step, reduction (kidney) and progressive weaning (liver) of immunosuppression is attempted in recipients who received MSC. Inclusion of liver patients is now complete, and to date 3 kidney patients received MSC. Primary results will be presented, and complete 6-month liver results are expected for the end of 2014. The next step will be to assert the immunosuppressive potential of MSC after organ transplantation, and the opportunity to develop larger randomised, controlled, phase III trials. [less ▲]Detailed reference viewed: 18 (6 ULg) The last Neanderthals in North-West Europe and the Lincombian-Ranisian-JerzmanowicianFlas, Damien Conference (2014, March 21)Detailed reference viewed: 16 (0 ULg) New fossils at the “Troisième caverne” of Goyet (Belgium) and the mortuary practices of late NeandertalsRougier, H.; Crevecoeur, I.; Beauval, C. et alConference (2014, March 21)Detailed reference viewed: 15 (0 ULg) Insight into the ecology of Neandertals in North-West Europe: stable isotopes and their palaeobiological implicationsWissing, C.; Bocherens, H.; Crevecoeur, I. et alConference (2014, March 21)Detailed reference viewed: 19 (0 ULg) L’E-learning et les nouvelles technologies de l'image dans les travaux pratiques d'histologie en Médecine Vétérinaire : Impacts sur la motivation et la maîtrise de l'apprentissage.Toppets, Vinciane ; Tonus, Céline ; Waroux, Olivier et alConference (2014, March 21)Detailed reference viewed: 14 (2 ULg) Le vécu de l'ICSI du côté de l'hommeBarbillon, Adrien ; Naziri, Despina Conference (2014, March 20)Detailed reference viewed: 15 (1 ULg) making the most of the LBTI nulling interferometry observations using a statistical data reduction methodMarion, Lindsay ; Mennesson, Bertrand; Defrère, Denis et alPoster (2014, March 20)Detailed reference viewed: 13 (0 ULg) Children’s perspectives on their working lives and on public action against child labour in Burkina FasoWouango, Joséphine Conference (2014, March 20)Since the end of 1990’s, there has been a growing interest to combat child labour in Burkina Faso. State actors as well as civil society organisations have started to engage themselves to urgently combat ... [more ▼]Since the end of 1990’s, there has been a growing interest to combat child labour in Burkina Faso. State actors as well as civil society organisations have started to engage themselves to urgently combat the worst forms of child labour. The 2006 National Statistical Survey found that 41.1 % of children aged 5 to 17 years were economically active. Compared to other West African countries, Burkina Faso is said to have the highest rate of children involved in hazardous work, which is one working child out of two. In this context of renewed interest regarding child labour, working children have their say. Based on a qualitative survey, this paper is focused on the perspectives of children working in two of the eleven hazardous sectors of activity identified by the 2009 National Decree: a stone quarry located in the capital Ouagadougou and an artisanal gold mine in a northern rural area. The paper aims to better understand the experience and opinions of children at work, to describe what work means to them, the role and the benefits of work in their lives and the difficulties they encounter. The focus is also on what children (and their families) think about public action against child labour and what are their aspirations regarding the current interventions. The analysis shows that if economic reasons lead children to work in in these two sectors of activity, this not the only determinant. The wish of a large number of children (and their parents) to find other less difficult work reopens the debate on children’s right to work. The results of this study reveal that there is a need to better understand how working children and their fmailies negotiate everyday life within the socio-cultural and economic context of Burkina Faso. [less ▲]Detailed reference viewed: 26 (0 ULg) Le suivi des enfants nés prématurés ou avec un très petit poids de naissance : le projet CAP48Mostaert, Anne; Nassogne, Marie-Cécile; Vermeylen, Danièle et alPoster (2014, March 20)This poster describes the cohort of very preterm and very low birth weight newborns recruted in the "CAP48" project and anaylses the main reasons for cessation of follow-up.Detailed reference viewed: 36 (3 ULg) Ostermeier dans la Cour d’honneur d’Avignon : un scandale qui n’a pas eu lieuDelhalle, Nancy Conference (2014, March 20)Detailed reference viewed: 5 (0 ULg) Les enseignants à l'image. Représentations iconographiques et audiovisuelles du mouvement enseignant (1995-1996)Lanneau, Catherine Conference (2014, March 20)Les réformes institutionnelles de 1988-1989 ont transféré aux Communautés les compétences en matière d’enseignement. Pour la Communauté française, cette responsabilisation a très vite rimé avec la ... [more ▼]Les réformes institutionnelles de 1988-1989 ont transféré aux Communautés les compétences en matière d’enseignement. Pour la Communauté française, cette responsabilisation a très vite rimé avec la nécessité de réaliser d’importantes économies et donc d’importantes réformes structurelles. Une première vague de protestation secoue Bruxelles et la Wallonie en 1990 mais, cinq ans plus tard, un nouveau plan d’économies préparé par la socialiste Laurette Onkelinx, Ministre-Présidente de la Communauté française, en charge notamment de l’Education, donne naissance à un long et douloureux mouvement de protestation. Celui-ci semble matérialiser la rupture entre une base enseignante proche, selon les réseaux, du PS ou du PSC, et un Exécutif au sein duquel ces deux partis fonctionnent en coalition. Réduction des dépenses, suppression de trois mille postes, fusions d’écoles, tous les ingrédients sont réunis pour que la situation soit explosive. Elle va l’être d’autant plus – et cela marquera d’ailleurs durablement les esprits – que certaines manifestations de mécontentement vont s’exprimer avec violence, s’attaquer à des symboliques fortes (la Fête de la Communauté française en septembre 1995, le 1er mai 1996) et perturber la vie privée de la Ministre et de son entourage. Notre contribution s’inscrit dans le volet « images produites ». Elle s’interrogera sur le rôle des images dans la représentation que la presse écrite généraliste a donnée du mouvement enseignant et des enseignants eux-mêmes durant ce conflit. Grâce à certaines archives numérisées, le traitement du mouvement par l’audiovisuel public pourra, lui aussi, être abordé. La photographie de presse, la caricature et le reportage ont-ils contribué à présenter le mouvement enseignant de manière objective et dépassionnée ? Ont-ils au contraire – et jusqu’à quel point ? - intégré les clichés traditionnels véhiculés sur cette catégorie socio-professionnelle (conservatisme, attachement à de supposés « privilèges »…). Quelle image est renvoyée du syndicalisme enseignant ? Comment est mise en scène la relation triangulaire entre grévistes, ministre et public de l’école (parents et élèves) ? Quels sont le poids et le rôle dévolus à chacun ? Quelle est, spécifiquement, le traitement réservé au mouvement par un journal comme La Wallonie ? Comment a-t-il accompagné en images la rupture entre le monde enseignant, la CGSP et le parti socialiste, culminant le 1er mai 1996 ? [less ▲]Detailed reference viewed: 22 (2 ULg) Les confesseurs des Princes et des Gouverneurs-généraux (1598-1665)Pirlet, Pierre-François Poster (2014, March 19)Detailed reference viewed: 23 (5 ULg) Contribution à l'amélioration de l'accès à une eau potable de qualité pour les populations de la région nord du Burkina FasoSome, Issam; Guel, Boubié; Hantson, Anne-Lise et alPoster (2014, March 19)Detailed reference viewed: 12 (0 ULg) Présentation de l'Action de Recherches Concertée EpistolARTDelfosse, Annick ; Allart, Dominique ; Moreno, Paola et alConference (2014, March 19)Detailed reference viewed: 27 (7 ULg) Goro Gheri, un secrétaire au service de l'artMiesse, Hélène Poster (2014, March 19)Detailed reference viewed: 4 (1 ULg) Le rôle politique et diplomatique joué par les nonciatures permanentes du Saint-Siège lors des congrès de paix en Westphalie (1644-1648)Regibeau, Julien Poster (2014, March 19)Detailed reference viewed: 11 (0 ULg) Artificial Abelian gauge potentials induced by dipole-dipole interactions between Rydberg atomsCesa, Alexandre ; Martin, John Poster (2014, March 19)We analyze the influence of dipole-dipole interactions between Rydberg atoms on the generation of Abelian artificial gauge potentials and fields. When two Rydberg atoms are driven by a uniform laser field ... [more ▼]We analyze the influence of dipole-dipole interactions between Rydberg atoms on the generation of Abelian artificial gauge potentials and fields. When two Rydberg atoms are driven by a uniform laser field, we show that the combined atom-atom and atom-field interactions give rise to nonuniform, artificial gauge potentials. We identify the mechanism responsible for the emergence of these gauge potentials. Analytical expressions for the latter indicate that the strongest artificial magnetic fields are reached in the regime intermediate between the dipole blockade regime and the regime in which the atoms are sufficiently far apart such that atom-light interaction dominates over atom-atom interactions. We discuss the differences and similarities of artificial gauge fields originating from resonant dipole-dipole and van der Waals interactions. We also give an estimation of experimentally attainable artificial magnetic fields resulting from this mechanism and we discuss their detection through the deflection of the atomic motion. [less ▲]Detailed reference viewed: 22 (10 ULg) Impact des matériaux biosourcés sur le climat intérieur : Un outil de calcul flexible à l'échelle de la pièceDubois, Samuel ; Lebeau, Frédéric Conference (2014, March 19)L'impact de l'utilisation de matériaux d'origine végétale sur le climat intérieur, et donc sur le confort des occupants ainsi que la performance énergétique du bâtiment, n'est établi que partiellement ... [more ▼]L'impact de l'utilisation de matériaux d'origine végétale sur le climat intérieur, et donc sur le confort des occupants ainsi que la performance énergétique du bâtiment, n'est établi que partiellement. Ces produits présentent des propriétés hygroscopiques et capillaires causant des phénomènes spécifiques liés aux changements de phase dynamiques au sein de la matrice poreuse. Les modèles mathématiques utilisés pour étudier leur comportement hygrothermique de manière détaillée sont souvent des modèles de paroi (dits modèles HAM - Heat Air Moisture). Cela sous-tend qu'ils nécessitent d'imposer des conditions aux limites à toutes les frontières de l'élément étudié, et ne permettent donc pas de connaître les flux de chaleur et de masse réels qu'offrent l'assemblage de matériaux vers le volume d'air intérieur. Pour y accéder, il convient d'intégrer ces modèles à la description de bilans thermique et hydrique de zones. Dans cette communication, nous présentons un modèle hygrothermique capable de simuler l'évolution temporelle du climat intérieur d'une ou de plusieurs pièces ("zones thermiques"). Il est composé d'un module HAM basé sur des équations aux dérivées partielles et caractérisant les transferts dans les matériaux de construction et développé au sein de l'environnement numérique COMSOL Multiphysics. Les équations qui le composent sont flexibles et facilement adaptables au cas expérimental modélisé ainsi qu'aux propriétés des matériaux composant les parois. En outre, on y trouve un traitement complet des phénomènes de changement de phase qui prend en compte l'impact de la température sur la capacité de stockage d'humidité du matériau. Ce premier module, est couplé à un outil caractérisant les bilans chaleur/masse au niveau de la zone à l'aide d'équations aux dérivées ordinaires. Le couplage des modèles est effectué au sein de SIMULINK, un outil de MATLAB destiné à l'étude des systèmes dynamiques. Nous appliquons ensuite ce modèle à l'étude d'un mur en ballots de paille séparant une enceinte climatique de grande taille en deux volumes d'air. Les données d'une expérience simple, un choc thermique imposé à un des volumes d'air, sont comparées aux sorties du modèle numérique. [less ▲]Detailed reference viewed: 15 (1 ULg) Intraocular lenses with functionalized surfaces by biomolecules in relation with lens epithelial cell adhesionHuang, Yi-Shiang ; Durrieu, Marie-Christine; De Pauw-Gillet, Marie-Claire Poster (2014, March 19)Detailed reference viewed: 11 (1 ULg) La correspondance de Francesco Guicciardini: Philologie et histoire des conceptsMoreno, Paola Poster (2014, March 19)Detailed reference viewed: 15 (3 ULg) Influence of dipole-dipole interactions decoherence-free statesDamanet, François ; Martin, John Poster (2014, March 18)Decoherence, known as the consequence of the coupling of any quan- tum system to its environment, causes information loss in the system and represents a major problem in the physical realization of quan ... [more ▼]Decoherence, known as the consequence of the coupling of any quan- tum system to its environment, causes information loss in the system and represents a major problem in the physical realization of quan- tum computers [1]. Decoherence-Free States (DFS) are considered as a possible solution to this problem. A set of trapped cold atoms placed in a DFS state will be immune against decoherence due to sponta- neous emission. However, because of dipole-dipole interactions between atoms, induced dephasing effects are likely to destroy the coherence and drive the system out of its DFS [1-2]. In this work, we study nu- merically the dynamics of a set of two-level atoms initially in a DFS with respect to dissipative processes by solving the master equation in- cluding both dissipative dynamics and dipole dipole interactions. We focus our attention on the influence of dipolar coupling on the radiated energy rate and coherence of the system as in [3]. In particular, by av- eraging over many realizations of close randomly distributed atomic positions, we show the formation of a superradiant-like pulse and we study its properties as a function of the dipolar coupling strength. [1] D. A. Lidar & K. B. Whaley, Lectures Notes in Phys., Vol. 622, p83-120, Springer (2003). [2] M. Gross & S. Haroche, Physics reports 93, 301-396 (1982). [3] W. Feng, Y. Li & S. -Y. Zhu, arXiv :1302.0957. (2013). [less ▲]Detailed reference viewed: 24 (5 ULg) To see or not to see: does video-CPR perform better than telephone-CPR?Ghuysen, Alexandre ; DELFOSSE, Anne-sophie ; STIPULANTE, Samuel et alPoster (2014, March 18)Detailed reference viewed: 34 (7 ULg) Estimation de la sédimentation des retenues hydro -agricoles de Kierma et de Wedbila : Méthodologie et résultats obtenus.Guyon, Francis; Hallot, Eric ; Kima, Etienne et alConference (2014, March 17)Detailed reference viewed: 9 (1 ULg) Système d’information sur la sédimentation et les apports sédimentaires dans les retenues d’eau d’irrigation : Objectifs de recherche et méthodologie de collecteHallot, Eric ; Guyon, Francis; de Thysebaert, DidierConference (2014, March 17)Detailed reference viewed: 11 (1 ULg) Evaluation et planification des ressources en eau des petites retenues hydro -agricoles : Application du modèle WEAP aux retenues de Kierma et de Wedbila (Burkina Faso).Razanamahandry Lovasoa, Christine; Hallot, Eric ; Guyon, Francis et alConference (2014, March 17)Detailed reference viewed: 11 (1 ULg) Enrichir le lait de vache en équol par la consommation de fourrages prairiaux spécifiquesFranckson, Delphine; Daems, Frédéric ; Decruyenaere, Virginie et alPoster (2014, March 16)Detailed reference viewed: 6 (1 ULg) PRP and tendinopathy, from in vitro to clinical trialsKaux, Jean-François Conference (2014, March 15)Detailed reference viewed: 19 (2 ULg) Retour au travail après une absence de longue duréeMairiaux, Philippe Conference (2014, March 14)Detailed reference viewed: 14 (1 ULg) Parallel Computing and Localization Techniques for Faster Power System Dynamic SimulationsAristidou, Petros ; Van Cutsem, Thierry in Proceedings of Cigre 2014 Belgium Conference (2014, March 13)Dynamic simulation studies are used to analyze the behavior of power systems after a disturbance has occurred. This type of simulation is essential when the system is operating close to its stability ... [more ▼]Dynamic simulation studies are used to analyze the behavior of power systems after a disturbance has occurred. This type of simulation is essential when the system is operating close to its stability limits or its behavior is dictated by complex control and protection schemes modifying its trajectory. These simulations can be computationally very demanding, especially if performed over a time interval of several minutes. In this paper, new shared- memory parallel computing techniques to increase the performance of large-scale power system dynamic simulations are described. The algorithms presented achieve this by utilizing the parallel processing resources available in modern, inexpensive, multi-core machines. In addition, the localized response of power systems after a disturbance is exploited to further accelerate simulations without decreasing accuracy. The medium-scale model of a real power system and a realistic large-scale test system have been used for the performance evaluation of the proposed methods. [less ▲]Detailed reference viewed: 74 (20 ULg) Une brochure, trois langues, trois cultures ?Letawe, Céline ; Rasier, Laurent Conference (2014, March 13)Detailed reference viewed: 27 (8 ULg) Wearable respiratory belt for human breathing controlStoukatch, Serguei ; Léonard, Jean; Bellier, Pierre et alin Conf. Proc. Smart Systems Integration Conf. (SSI2014) (2014, March 12)We designed and manufactured a working prototype of a wearable respiratory belt. The belt can work as a stand along system or can be embedded into clothes. The system is intended for remote health ... [more ▼]We designed and manufactured a working prototype of a wearable respiratory belt. The belt can work as a stand along system or can be embedded into clothes. The system is intended for remote health monitoring (particularly to monitor human respiration) such as home healthcare, remote medicine and remote socio-medical assistance as well as to monitor patients. The fully functional prototype proofs the concept that the elongation in the respiratory belt causes by human respiration is accurate enough to measure and to monitor human respiration. [less ▲]Detailed reference viewed: 22 (2 ULg) Open-source CAT software: R packages and ConcertoMagis, David Conference (2014, March 12)Together with the investigation of new or updated CAT procedures, it is of primary importance to ensure development of appropriate, flexible and useful CAT software. Open-source CAT algorithms have been ... [more ▼]Together with the investigation of new or updated CAT procedures, it is of primary importance to ensure development of appropriate, flexible and useful CAT software. Open-source CAT algorithms have been recently proposed and are offering very promising tools for future practical CAT implementations, though yet under development. After a brief overview of available (commercial) software, I will present and compare the characteristics of some open-source R packages as CAT solutions: catR (Magis, & Raîche, 2012), catIrt (Nydick, 2013) and MAT (Choi, 2011), as well as the R-based software Firestar (Choi, 2009). A more complete description of catR will be given and (depending on time and computer constraints) a short illustrative session will be proposed. Finally, the web platform Concerto (Kosinski & Rust, 2011) will be shortly introduced. References: Choi, S. W. (2009). Firestar: Computerized adaptive testing simulation program for polytomous item response theory models. Applied Psychological Measurement, 33, 644-645. Choi, S. W. (2011). MAT: Multidimensional Adaptive Testing (MAT). R package version 0.1-3. Kosinski, M., & Rust, J. (2011). The development of Concerto: An open source online adaptive testing platform. Paper presented at the International Association for Computerized Adaptive Testing, Pacific Grove, CA. Magis, D., & Raîche, G. (2012). Random generation of response patterns under computerized adaptive testing with the R package catR. Journal of Statistical Software, 48 (8), 1-31. Nydick, S. W. (2013). catIrt: An R package for simulating IRT-based computerized adaptive tests. R package version 0.4-1. [less ▲]Detailed reference viewed: 168 (2 ULg) What is the role of the VLTI in the study of particle acceleration in massive binaries?De Becker, Michaël Conference (2014, March 12)Among massive binaries, a fraction is known to accelerate particles up to relativistic energies. The acceleration process is believed to take place in the wind-wind interaction region, and most of these ... [more ▼]Among massive binaries, a fraction is known to accelerate particles up to relativistic energies. The acceleration process is believed to take place in the wind-wind interaction region, and most of these systems are identified through the production of synchrotron radiation in the radio domain. Considering the crucial role played by binarity in the physics of particle acceleration, tools such as the VLTI appear to be highly relevant to explore the basic properties of this population of objects. A few recent results and prospects for future studies will be briefly presented. [less ▲]Detailed reference viewed: 13 (0 ULg) Precision design, solution behavior and application of stimuli-responsive N-vinylamides containing copolymersDebuigne, Antoine ; Kermagoret, Anthony ; Mathieu, Kevin et alConference (2014, March 12)Detailed reference viewed: 26 (5 ULg) On the Identication of Symmetric N-qubit Maximally Entangled StatesBaguette, Dorian ; Bastin, Thierry ; Martin, John Poster (2014, March 11)Maximally entangled states can serve as a useful resource in many different contexts. It is therefore important to identify those states. Here we are interested in the identification of maximally ... [more ▼]Maximally entangled states can serve as a useful resource in many different contexts. It is therefore important to identify those states. Here we are interested in the identification of maximally entangled states in the symmetric subspace of an N-qubit system. By maximally entangled states, we refer to symmetric states characterized by a one qubit reduced density matrix proportional to the identity. These states maximise various entanglement measures [1] such as von Neumann and Meyer-Wallach entropy and are unique up to LU in their SLOCC class [2]. We identify and characterize all maximally entangled symmetric states up to 4 qubits. We provide general conditions for a symmetric state with an arbitrary number of qubits to be maximally entangled and identify families of SLOCC classes which do not contain any maximally entangled states. [1] F. Verstraete, J. Dehaene, B. De Moor, Phys. Rev. A 68, 012103 (2003). [2] G. Gour, N. Wallach, N. J. Phys. 13, 073013 (2011) [less ▲]Detailed reference viewed: 34 (5 ULg) Ondes de choc et tendinopathies : expérience clinique du CHU de LiègeKaux, Jean-François Conference (2014, March 11)Detailed reference viewed: 54 (3 ULg) Bringing regenerating tissues to life: the importance of angiogenesis in tissue engineeringCarlier, Aurélie ; Van Gastel, Nick; Geris, Liesbet et alPoster (2014, March 11)Detailed reference viewed: 28 (4 ULg) Performing Emotions at the Canonization of St. Ignatius and St. XavierDelfosse, Annick ; Vermeir, Koen; Delbeke, Maarten et alConference (2014, March 08)This paper will approach the celebrations of the canonization of St. Ignatius and St. Xavier in different localities of the Southern Netherlands over the course of 1622 as performances of emotion. We will ... [more ▼]This paper will approach the celebrations of the canonization of St. Ignatius and St. Xavier in different localities of the Southern Netherlands over the course of 1622 as performances of emotion. We will analyze little known visual and textual testimonials of festivals and theatrical representations in Antwerp, Douai, Brussels, Dunkerque and Leuven to examine which means were used to represent, convey and enhance emotions, which actors were involved, how emotions were meant to address and affect the audience, and to what end emotions were activated. The double canonization of 1622 consecrated the Jesuits as stalwarts of the Roman papacy. In the Southern Netherlands, the celebrations of 1622 were a key moment in confirming the legitimacy of the order by displaying both how it was embedded in the local political and religious arena, and how it mastered the most advanced artistic means to support its mission. After a sketch of the celebrations and their political and religious context, we will analyze how and why emotion was performed in three steps. The sources attach enormous attention to the material, architectural and urban setting of the celebrations, by emphasizing the splendor and artistic sophistication of the events, and by pointing out the prestigious patronage that had accrued around them. We will examine whether and how the sources charged the material context of the celebration with emotion. What was the intended effect of this context on the audience? How did this context enable the performance of emotion in different forms of public display (pageantry, performances, …)? In order to answer this last question, in a second step we will have a closer look at the Triumphus dedicated to St Ignatius and St. Xavier performed in Brussels. We will examine how, in this ensemble, the material context is activated by the movement of the viewer. The description of the Triumphus singles out moments of transition as instances of heightened emotivity, suggesting that emotions are not mobilized by singular details but by overall views that impress themselves when the beholder crosses a treshold. In a third step we will describe the intended effect of the performance of emotions as a sacer horror, the bodily manifestation of religious awe, the organic sensation of respect mixed with fear and wonder felt in the presence of gods or cosmic forces. The performance of emotions, engendered by multiple layers of transformation (of the material context by means of ephemeral architecture, of the views and the experiences of the viewer, and ultimately, of their affective state) was directed at effectuating a lasting change of heart. [less ▲]Detailed reference viewed: 13 (2 ULg) John McDowell en phénoménologue. Propositions pour une interprétation conceptualiste de l'intentionnalitéZincq, Aurélien Conference (2014, March 07)Detailed reference viewed: 13 (2 ULg) Using features of mercury and methylmercury to discriminate contamination profiles between sea bass, Dicentrarchus labrax, populationsCransveld, Alice ; Amouroux, David; Koutrakis, Emmanuil et alPoster (2014, March 07)Despite many efforts consented in the last decades, Mercury (Hg) emissions have kept rising worldwide. Currently, anthropogenic inputs dominate Hg emissions to the atmosphere by far, natural releases ... [more ▼]Despite many efforts consented in the last decades, Mercury (Hg) emissions have kept rising worldwide. Currently, anthropogenic inputs dominate Hg emissions to the atmosphere by far, natural releases accounting only for a 4th of the total. Because Hg has a stable gaseous form (Hg0) with a long residence time in the atmosphere (~1year), both natural and industrially produced Hg can be transported far from point sources. Therefore, many uncertainties remain in our knowledge about Hg biogeochemistry. Our study aims at identifying the different Hg forms found in marine predators in order to discriminate different polluted areas and potential pollution sources. More specifically, we seek to discriminate contaminations of local origins versus contamination of global origins. To achieve this, we are currently studying different sea bass, Dicentrarchus labrax, populations from the Atlantic Ocean and Mediterranean. In muscle, liver, kidney and brain tissues, we analyze total Mercury (THg) and methylmercury (MeHg). We are also testing the discrimination power of Hg's stable isotopes (199Hg, 201Hg and 202Hg). Indeed, recent findings show that Hg isotopes can exhibit both mass-dependent (MDF) and mass-independent fractionation (MIF). This means that Hg isotopes provide two different types of information at once, both on biological cycling of Hg, including bioaccumulation (MDF), and on chemical pathways such as photochemical transformations (MIF). Eventually, we are planning to extend our results with compound specific isotope analysis (CSIA) on the carbon of methylmercury. Preliminary analysis performed on 14 juvenile specimens from the North Sea and the Aegean Sea indicate that THg concentrations are higher in individuals from the North Sea than from Greece. The lack of correlation with size and weight indicate that it is likely linked to a difference in contamination levels between the two areas. MeHg is the predominant form of Hg in muscle, while the same cannot be asserted for liver. Mass dependent isotopic values (δ202Hg), were always higher in muscle than in liver and, for each tissue, values were similar between the two areas. This is probably related to the species distribution and to some internal Hg metabolism. For mass independent isotopic signature (MIF), sea bass from the Aegean Sea had a systematically higher Δ201Hg value than individuals from the North Sea. Thus, mass independent values seem definitely site dependent and might be in agreement with differences in both mercury sources and cycling in the North and Aegean Seas. These preliminary results consequently indicate that Hg isotopes may help to discriminate fish from different areas. This promising outcome must be further confirmed by extending our sampling and will be coupled to other results obtained through CSIA. [less ▲]Detailed reference viewed: 23 (3 ULg) Corsican seagrass detritus: An opportune shelter or a copepod Eldorado?Mascart, Thibaud ; Lepoint, Gilles ; Remy, François et alPoster (2014, March 07)Seagrass ecosystems are extensive beds of marine flowering plants bordering tropical and temperate coastal regions. They play an important role in maintaining biological productivity and bio-geochemical ... [more ▼]Seagrass ecosystems are extensive beds of marine flowering plants bordering tropical and temperate coastal regions. They play an important role in maintaining biological productivity and bio-geochemical cycles in the sea and support higher diversity and abundance of fauna in comparison to adjacent non-vegetated areas. The seagrass meadow primary production can be directly consumed through herbivory but the majority of the plant material falls on the sea floor during the autumnal leaf senescence. The leaf litter then degrades within the meadow or accumulates with other micro- and macrophytodetritus to form detritus accumulations on the adjacent non-vegetated sand patches. These exported accumulations are quite dynamic in relation to seafloor geomorphology and local hydrodynamics. Thus, the detritus accumulations are an easily disturbed ephemeral environment with one large influx a year. Consequently the physico-chemical characteristics can change very fast and impact the sheltering capacity and food supply present. Nonetheless, fishes, macrofauna and meiofauna are omnipresent throughout the year. In our study site along the shore of N-W Corsica, Posidonia oceanica seagrass meadows are characterised by substantial detritus accumulations. The present study aimed to analyse the biodiversity of the copepod species communities (Crustacea, Copepoda) in those detritus accumulations. The results showed that the copepod detritus community consisted of a mixture of species that are also found in adjacent habitats (seagrass meadow, sediment, epilithic habitats, water column). Each adjacent habitat is characterised by organisms that are morphologically adapted to the specific features of that habitat. The majority of copepods are epiphytic (order Harpacticoida), that occur typically on seagrass leaves and macroalgae. Other species are planktonic (orders Cyclopoida and Calanoida) and some were benthic (order Harpacticoida), known from the nearby sediment. A minority of the copepod community were parasitic on fish or invertebrate (order Siphonostomatoida). In order to clarify their origin, we assume that passive transport by currents plays a significant role next to the active migration from the anoxic sediments under the detritus. For sure they also reproduce within the detritus packages as we found many nauplii, copepodites and gravid females. The above mentioned suggestions cannot explain such high density of copepods by themselves. Other attraction mechanisms are needed to explain the important amount of planktonic and epiphytic species with good swimming ability, such as higher food accessibility. In the detritus no plant-defence mechanisms are present anymore and a lot of micro-organisms and thus potential food sources are present. Furthermore, the dense detritus package provides shelter and protection from potential predators. Subsequently we may consider the detritus accumulations as a copepod species-specific opportune Eldorado for sheltering, nursing and feeding. [less ▲]Detailed reference viewed: 24 (3 ULg) Microplastics caught in herring gill rakers: illustration by scanning electron microscopyCollard, France ; Das, Krishna ; Parmentier, Eric Conference (2014, March 07)Plastics are produced in huge quantity (280 million of tons in 2012) and more than 10% end up in the oceans. It is estimated that between 60 and 80% of all marine debris are plastics. Plastics are ... [more ▼]Plastics are produced in huge quantity (280 million of tons in 2012) and more than 10% end up in the oceans. It is estimated that between 60 and 80% of all marine debris are plastics. Plastics are persistent and have accumulated in the oceans for several decades. Plastics may adverse wildlife in many ways: they can be ingested by marine vertebrates and cause internal wounds in the digestive tract. Plastics are also vectors of organic pollutants including. Once ingested, plastics may release these pollutants in the organism. Plastics present in the marine environment fragment in small pieces by mechanical stress and UV radiation leading to the so-called microplastics smaller than 5 mm. Little is known about microplastics ingestion and toxicity in planktivorous fish such as the herring, Clupea harengus. Planktivorous fish have gill rakers, which may function as a trap for microplastics. This study aims to describe and characterise microplastics present on gill rakers of the herring, Clupea harengus. Ten gill cavities were sampled in January 2013 in the Channel and the North Sea during a fishery campaign organized by the IFREMER. Gills cavities were placed in a fixating solution until preparation for scanning electron microscopy (SEM). SEM was used in order to detect microplastics which are too small to be observed by a dissection microscope, to compare them with the distance between gill rakers and to characterise the surface and the shape of microplastics. Scanning electron microscopy revealed large variety of microplastics, which lengths ranged from 0.05 to 5mm. Relationship between microplastics length and distance between gill rakers was analysed on the same branchial arch. The present study revealed the presence of microplastics in an edible species of high economic value and raise question about potential impact on the herring and its consumers, including human beings. [less ▲]Detailed reference viewed: 92 (4 ULg) Modes intentionnelsDewalque, Arnaud Conference (2014, March 07)Je dresse le bilan de la situation des recherches actuelles en théorie de la perception (entre représentationalisme et relationalisme), et je suggère que la voie d'investigations la plus prometteuse est l ... [more ▼]Je dresse le bilan de la situation des recherches actuelles en théorie de la perception (entre représentationalisme et relationalisme), et je suggère que la voie d'investigations la plus prometteuse est l'intentionalisme modal. D'après l'intentionalisme modal, un état mental est individualisé par son contenu intentionnel et par son mode intentionnel. En m'appuyant sur la méthode descriptive de Franz Brentano, je propose alors un argument en faveur de cette conception: l'argument de la complétude. [less ▲]Detailed reference viewed: 15 (1 ULg) Early neuropsychological detection of Alzheimer's diseaseBastin, Christine Conference (2014, March 06)Considering that brain pathology due to Alzheimer’s disease starts many years before the clinical symptoms become evident, subtle cognitive changes may exist already in the predementia phase. Different ... [more ▼]Considering that brain pathology due to Alzheimer’s disease starts many years before the clinical symptoms become evident, subtle cognitive changes may exist already in the predementia phase. Different approaches have been used to detect initial cognitive impairments indicative of Alzheimer’s disease. One approach is the assessment of the predictive power of neuropsychological tools in characterizing patients with stable mild cognitive impairment (MCI) versus MCI patients who subsequently develop Alzheimer’s disease. Another approach is the longitudinal evaluation of large cohorts of older adults in population-based studies. Findings from several studies suggest that a memory test that ensures deep encoding of information and assesses retrieval with free as well as cued recall is a useful tool to distinguish patients at an early stage of Alzheimer disease from MCI non-converters. Impaired semantic memory has also been proposed as a neuropsychological marker of predementia Alzheimer’s disease. Beyond the memory domain, category verbal fluency has been shown to predict progression to Alzheimer’s disease. Moreover, combining neuropsychological scores of memory and executive functions and neuroimaging data allows a better discrimination between stable MCI and converters than neuroimaging data alone. Altogether, it is possible to detect cognitive changes that are predictive of the typical form of probable Alzheimer’s disease already in the predementia stage. Such at risk people are thought to be the best target for therapeutic interventions. [less ▲]Detailed reference viewed: 50 (3 ULg) Equations fantaisistes : l'argent comme ressort burlesque dans l'œuvre de Pierre La PoliceBelloi, Livio Conference (2014, March 06)Conçue comme une vaste parodie du discours médiatique en général et de la presse quotidienne en particulier, la série "Véridique !" (Cornélius, 1999-2002) du dessinateur français Pierre La Police met ... [more ▼]Conçue comme une vaste parodie du discours médiatique en général et de la presse quotidienne en particulier, la série "Véridique !" (Cornélius, 1999-2002) du dessinateur français Pierre La Police met volontiers en scène des questions ou des rapports d’argent. Le plus souvent lié à la sphère politique, le thème de l’argent autorise l’auteur à jeter un regard narquois et particulièrement acéré sur des événements qui firent grand bruit dans la France des années 1990 (l’affaire Roland Dumas, le scandale de l’ARC, l’affaire des emplois fictifs à la ville de Paris, etc.). Ma communication étudie au plus près les mises en scène de l’argent dans l’œuvre de Pierre La Police et s'efforce de porter au jour les véritables équations mises au point à cet égard par l’auteur. Toutes à leur manière, ces équations concourent à faire du thème de l’argent un ressort burlesque à part entière ; elles participent également d’une esthétique générale de la distorsion et de l’approximation, qui est comme la marque de fabrique de Pierre La Police. [less ▲]Detailed reference viewed: 13 (0 ULg) Intentionalisme et représentationalisme de Brentano à CraneBoccaccini, Federico Conference (2014, March 06)Detailed reference viewed: 8 (0 ULg) A vision-based autonomous inter-row weederKrishna Moorthy Parvathi, Sruthi Moorthy ; Detry, Renaud ; Boigelot, Bernard et alConference (2014, March 05)Autonomous robotic weed destruction plays a significant role in crop production as it automates one of the few unmechanized and drudging tasks of agriculture i.e. manual weed destruction. Robotic ... [more ▼]Autonomous robotic weed destruction plays a significant role in crop production as it automates one of the few unmechanized and drudging tasks of agriculture i.e. manual weed destruction. Robotic technology also contributes to long-term sustainability with both economic and environmental benefits, by minimising the current dependency on chemicals. The aim of this study is to design a small low-cost versatile robot allowing the destruction of weeds that lie between the crop rows by navigating in the field autonomously and using a minimum of a priori information of the field. For the robot to navigate autonomously, necessary and sufficient information can be supplied by a machine vision system. One important issue with the application of machine vision is to develop a system that recognises the crop rows accurately and robustly which is tolerant to problems such as crops at varying growth stages, poor illumination conditions, missing crops, high weed pressure, etc. Aiming at accurate and robust real-time guidance of autonomous robot through the field, the plethora of image processing algorithms like Ostu’s threshold method and hough transform will be explored for two main processes namely the image segmentation and crop row detection respectively. In order to overcome the issue of large variabilities encountered in agriculture such as varying weather conditions, intelligent stochastic data fusion and machine learning algorithms will be used to combine data from heterogeneous sensors. Besides crop row detection, other major challenges foreseen are: mapping the unknown geometry of the field, high-level planning of efficient and complete coverage of the field, controlling the low-level op- erations of the robot, and ensuring security. Specialised sensors such as GPS will be considered to generate the map of the field enabling Simultaneous Localisation And Mapping (SLAM) in real time on a mobile platform. The generated map will be exploited along with the sensorial in- formation from crop row detection to efficiently plan and execute the guidance of the robot au- tonomously in the field, thereby enabling weed elimination. [less ▲]Detailed reference viewed: 58 (5 ULg) Some Interesting Sources of Plant Seed OilPaul, Aman ; Danthine, Sabine ; Blecker, Christophe et alPoster (2014, March 05)There is a growing realization worldwide that biodiversity is fundamental to agricultural production and food security, as well as a valuable ingredient of environmental conservation. Flowering strips ... [more ▼]There is a growing realization worldwide that biodiversity is fundamental to agricultural production and food security, as well as a valuable ingredient of environmental conservation. Flowering strips around the border of the crops serves as an important function to improve the biodiversity, besides this they play a major role in the ruminant nutrition and serve as a source of numerous beneficial compounds. It is well known that seeds store their food reserves for next generation mainly in the form of lipids; some of the seeds from these flowering strips could be an interesting source of lipids. These seed oils could play important role in food, pharmaceutical, cosmetics and other industries. The extraction of seed oil from four such plant species in Belgium namely Oregano (Origanum vulgare), Yellow Bedstraw (Galium verum), Common Self-heal (Prunella vulgaris) & Purple loosestrife (Lythrum salicaria) was carried out. Extraction was done by a cold extraction technique using chloroform/methanol in 2:1 ratio as solvent. Amount of oil extracted from Oregano, Yellow Bedstraw, Common Self-heal and Purple loosestrife was 22.58±0.03 %, 3.28±0.01 %, 14.84±0.12 % & 20.32±0.15 %. The fatty acid profiles of these four species were determined by gas chromatography (using methyl esters of their fatty acids); Oleic acid and Linoleic acid were found in all the four species, Gamma-linolenic acid was found in Purple loosestrife & Alpha-linolenic acid was found in Oregano and Common Self-heal plant species. Thermal behaviour of these four plant seed oils were analyzed using Differential Scanning Calorimetry (DSC), while some other physicochemical properties of the seed oils were also analyzed. These plant seed oils can be of great commercial importance. [less ▲]Detailed reference viewed: 54 (18 ULg) Chemical Hydrolysis of Fagus sylvatica Wood: Dilute Acid vs. Alkaline TreatmentMiazek, Krystian ; Goffin, Dorothée ; Richel, Aurore Poster (2014, March 05)Lignocellulosic biomass, found in a large variety of plants such as coniferous trees (Softwood), broad leaved trees (Hardwood), grasses and agricultural or food residues, is the most abundant source of ... [more ▼]Lignocellulosic biomass, found in a large variety of plants such as coniferous trees (Softwood), broad leaved trees (Hardwood), grasses and agricultural or food residues, is the most abundant source of molecules required for production of biofuels and high value - added products. Lignocellulose is composed of three polymers: cellulose, hemicellulose and lignin. Cellulose is a non-branched polymer consisting of glucoses (hexoses). Hemicellulose is a complex carbohydrate containing pentoses (mainly xyloses in the case of Hardwood, grasses and agricultural wastes) or hexoses (usually mannoses in the case of Softwood) as the main sugars. Lignin is a biopolymer with aromatic alcohols as basic monomeric units. Cellulose chains are arranged in bundles and interlinked with hemicellulose. Lignin is cross-linked with hemicellulose and occupies space between cellulose bundles. Due to complex polymeric structure, lignocellulosic materials are resistant to hydrolysis. A number of treatment methods (mechanical, chemical, biochemical) is implemented to successfully hydrolyse lignocellulose. Amongst chemical methods harnessed to break lignocellulose structure, dilute acid and alkaline treatments are commonly mentioned, as the most efficient ones. The objective of this study was to evaluate the effect of dilute acid and alkaline treatment on hydrolysis rate of polymeric components in Fagus sylvatica wood. Fagus sylvatica also known as common beech is a broad leaved, deciduous tree that belongs to the family of Fagaceae, widely spread in Europe. Beech wood was determined to contain 48 % glucose, 18 % xylose and 20 % Klason lignin in its dry material. Results of this study showed that 1 h hydrolysis at 100 °C with the use of 3 % H2SO4 resulted in 71 % removal of xylose and 4 % removal of glucose with Klason lignin remained intact. Additionally, the presence of sugar degradation products: 2 - furfural and hydroxymethylfurfural was detected in dilute acid hydrolysate. Release of 2 - furfural and hydroxymethylfurfural from beech wood was determined as 0.03 % and 0.1 %, respectively. On the other hand, 1 h hydrolysis at 100 °C with the use of 7 % NaOH caused 59 % xylose removal and 11 % removal of Klason lignin with no effect on glucose. Dilute acid hydrolysis proved to be more efficient in removing xylose, but alkaline hydrolysis additionally showed to remove Klason lignin. [less ▲]Detailed reference viewed: 37 (6 ULg) Wildflower strips: a help for crop protection ?Hatt, Séverin ; Uyttenbroeck, Roel ; Bodson, Bernard et alConference (2014, March 05)Detailed reference viewed: 16 (4 ULg) Wildflower strips: a help for crop protection ?Hatt, Séverin ; Uyttenbroeck, Roel ; Bodson, Bernard et alPoster (2014, March 05)Detailed reference viewed: 20 (1 ULg) Theoretical characterization of the interactions between organic ligands and metallic clustersFresch, Barbara Conference (2014, March 04)Detailed reference viewed: 15 (0 ULg) Using active and passive acoustics to assess O2 production of a Posidonia oceanica meadowFelisberto, P; Zabel, F; Rodriguez, O et alPoster (2014, March 04)Detailed reference viewed: 5 (0 ULg) How do we perceive vocal pitch accuracy during singing?Larrouy, Pauline ; Pfordresher, Peter QConference (2014, March 03)Detailed reference viewed: 13 (0 ULg) Shergottites: Partial Melts of a Depleted Martian MantleMédard, Etienne; Collinet, Max Poster (2014, March)Detailed reference viewed: 11 (0 ULg) Modeling reaction-limited Ostwald ripening of supported Ni catalysts in presence of CO: the role of particle size distributionGommes, Cédric ; Munnik, Peter; de Jongh, Petra et alPoster (2014, March)Detailed reference viewed: 9 (0 ULg) Dimethyl sulfide and dimethylsulfoniopropionate profiles in sea ice during winter in the Weddell SeaUhlig, C.; Tison, J.-L.; Rintala, J. et alConference (2014, March)This study presents profiles of the organic sulphur components dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in sea ice cores collected during the AWECS (Antarctic Winter Ecosytem Climate ... [more ▼]This study presents profiles of the organic sulphur components dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in sea ice cores collected during the AWECS (Antarctic Winter Ecosytem Climate Study) cruise on RV Polarstern (ANT29-6) in the Weddell Sea. DMS is a semi-volatile sulfur component and under discussion to be climate active, as its oxidation products might act as cloud condensation nuclei - thus cooling the atmosphere. It is produced by enzymatic cleavage of the precursor DMSP, which is synthesized by various types of phytoplankton and serves for example as compatible solute and cryoprotectant. Due to the physico-chemical conditions given, i.e. the high salinity and the icy matrix, sea ice as habitat favors production of high levels of DMSP by the inhabiting microalgae. DMSP and DMS are frequently found in high concentrations in sea ice during spring and summer. The aim of this study was to investigate DMS(P) levels in winter sea ice as data for the winter season is yet scarce, but is of importance for global budgeting. Preliminary results of our study show that DMS(P) production in sea ice in the Weddell Sea is also significant during winter. This stands in contrast to previous measurements in Arctic winter sea ice (CFL-IPY cruise in the Circumpolar Flaw Lead Polynya), where DMS(P) concentrations were very low. Possible explanations for the differences between DMS(P) levels in the Arctic and Antarctic might be the different snow cover and thus insulation, light regimes and also microbial community structure within the ice. DMS(P) levels were generally correlated with chlorophyll a concentrations, although the details are complex and seem to be influenced by species composition and species specific DMSP/Chla ratios. The DMS profiles mirrored the permeability of the sea ice following DMSP in the impermeable areas while showing losses to the ice surface and ice-water interface in the more permeable regions. Winter DMS(P) profiles are furthermore compared to data collected during the following spring cruise of RV Polarstern (ANT29-7) in the Weddell Sea. [less ▲]Detailed reference viewed: 38 (2 ULg) Rupture et repli sur soi. À propos de quelques traits posturaux de Rousseau dans sa correspondance entre 1762 et 1765Biquet, Stéphanie in Francalanza, Eric (Ed.) Actes du colloque international "Rousseau en toutes lettres", Brest 22-24 mars 2012 (2014, March)Detailed reference viewed: 16 (1 ULg) Partial anomalous pulmonary venous connection : systematic echocardiography allows incidental diagnosFARHAT, Nesrine ; SEGHAYE, Marie-Christine Conference (2014, March)Detailed reference viewed: 12 (0 ULg) Organized proteomic heterogeneity in colorectal liver metastases and implications for therapiesTurtoi, Andrei ; Blomme, A; Debois, Delphine et alin Acta Gastro-Enterologica Belgica (2014, March), 77(1), 07Detailed reference viewed: 7 (1 ULg) Land-fast sea ice of McMurdo Sound as a source of bio-essential trace metals for primary productivity in the Ross Sea, AntarcticaSchoemann, V.; de Jong, J.T.M.; Tison, J.L. et alConference (2014, March)Iron (Fe) is an essential micronutrient. Its low abundance limits primary productivity in more than 30% of the oceans, including the Southern Ocean, and has a crucial impact on the biogeochemical cycles ... [more ▼]Iron (Fe) is an essential micronutrient. Its low abundance limits primary productivity in more than 30% of the oceans, including the Southern Ocean, and has a crucial impact on the biogeochemical cycles of carbon and other elements with ultimate influence on the Earth climate system. Other trace metals, like Mn, Zn, Co and Cu are also required for microorganisms cell metabolism and may be (co-) limiting. Previous data on dissolved and particulate Fe concentration data showed that Fe is 10-100 times more concentrated in the sea ice than in underlying seawater and that sea ice melt can deliver up to 70% of the daily Fe supply to the surface waters. According to budget estimates in East Antarctica and in the Weddell Sea, accumulated Fe would largely derive from the underlying seawater rather than from atmospheric inputs. Most of the available data of trace metals in the sea ice concern pack ice and Fe. Only very scarce data exist on land-fast ice and on other trace metal concentrations. In this presentation, the general objective is to assess the role of land-fast ice as a source of Fe and other bio-essential trace metals (e.g. Mn, Zn, Cu, Mo, Cd), its impact on primary productivity and on the biological pump. Samples of sea ice, brines and seawater as well as dusts samples have been collected during the land-based sampling program YROSIAE at Cape Evans (Scott Base, McMurdo Sound, Ross Sea, Antarctica) from Nov 2011 to Dec 2011 and from Aug 2012 to Dec 2012. Dissolved and particulate trace metals concentrations have been measured by a recently developed method, which combines multiple element isotope dilution with preconcentration using the Nobias Chelate PA1 resin and ICP-MS analysis. Concentrations of trace metals in snow collected during the present study are one to up to five orders of magnitude higher than the concentrations previously observed in snow from East Antarctica, showing a much stronger dust input of these metals in McMurdo Sound. When comparing the concentrations obtained in the under-ice seawater with those obtained in the snow at McMurdo Sound, concentrations of Fe, Al, Mn, Co are much lower, whereas concentrations of Cu, Zn and Pb are similar and the concentrations of Ni, Mo and Cd are higher. Inventories of these trace metals in the land-fast sea ice give insights on its role as a source of bio-essential trace metal for the fuelling of the seasonal Ross Sea bloom. Other sources of these trace metals will be addressed and compared. [less ▲]Detailed reference viewed: 61 (7 ULg) Alkaline Primary Melts from the Primitive Mantle of MarsCollinet, Max ; Médard, Etienne; Vander Auwera, Jacqueline et alPoster (2014, March)Detailed reference viewed: 21 (10 ULg) Learning to Learn: Assessment of Metacognitive competenciesFrenkel, Stéphanie ; Nobile, Debora in IATED (Ed.) INTED2014 Proceedings (2014, March)Numerous students are having school difficulties linked to the way they learn. Some authors speak of a “metacognitive deficit”. We refer to a “sleeping potential” instead (Frenkel, 2013, in press; Frenkel ... [more ▼]Numerous students are having school difficulties linked to the way they learn. Some authors speak of a “metacognitive deficit”. We refer to a “sleeping potential” instead (Frenkel, 2013, in press; Frenkel & Deforge, in press; Frenkel & Nobile, 2013). Be it psychologists, teachers or parents, all wish to develop their skills in order to help these students. This is the case in primary and secondary school. Metacognitive abilities play a central role in learning (e.g., Frenkel & Deforge, in press; Giasson, 2001; Grangeat, 1997; Hessels & Hessels-Schlatter, 2010b; Lumbelli, 2003; Poissant, Poëllhuber & Falardeau, 1994; Rozencwajg, 2003; Veenman, Kok & Blöte, 2005) and thus in successful school learning (Büchel, 2013a, 2013b; Van der Stel & Veenman, 2010; Wang, Haertel & Walberg, 1994). However, studying them requires that we clarify what is meant by “metacognition” and “metacognitive abilities”. In this framework, we developed the EDUCA + project which is intended to provide possible solutions. EDUCA + is based on wide field experience. Its theoretical background is based on a substantial review of the literature. Its objective is to increase the expertise of “front line” field workers by developing specific products such as tools, training courses, services, and a website (Frenkel, in press). This will notably enable them to develop their expertise, detect « sleeping » potential, diagnose, give advice when necessary, intervene (prevention and remediation) and use the tools efficiently. Two types of tools are being designed. On the one hand, assessment tools (tests allowing to put forward the learner’s strengths and weaknesses as well as the scope of his/her “sleeping potential”). On the other hand, intervention tools (short prevention vs. remediation programs). This also includes training courses and services. The creation of a website also aims to reinforce the actions of EDUCA + (personalized access depending on the internaut’s profile: students, parents, professionals). The aim of this paper is to present this research project and its main theoretical background. [less ▲]Detailed reference viewed: 48 (16 ULg) Epidémiologie des infections virales respiratoires basses communautaires des enfants hospitalisésMARINI, Tania ; STERGIOPOULOU, Theodouli ; LEBRETHON, Marie-Christine et alConference (2014, March)Detailed reference viewed: 19 (3 ULg) Prognostic value of FDG PET/CT in liver transplantation for hepatocarcinomaDETRY, Olivier ; Govaerts, L; BLETARD, Noëlla et alin Acta Gastro-Enterologica Belgica (2014, March), 77(1), 08AIM : FDG uptake has been shown to predict the outcome in large series of patients with hepatocarcinoma (HCC) in Asia, but few data are available regarding European populations. Our aim was to evaluate ... [more ▼]AIM : FDG uptake has been shown to predict the outcome in large series of patients with hepatocarcinoma (HCC) in Asia, but few data are available regarding European populations. Our aim was to evaluate the prognostic value of pretreatment FDG PET-CT in patients treated by liver transplantation. Methods: We retrospectively analyzed the data of 27 patients (24 M and 3 W, mean age 58 ± 9 years). The mean follow-up was 26 ± 18 months (min 1 month, max 66 months). All patients had an FDG PET-CT before the transplantation. The FDG PET/CT was performed according to a standard clinical protocol: 4 MBqFDG/kg body weight, uptake 60 min., low-dose non-enhanced CT. We measured the SUVmax and SUVmean of the tumor and the normal liver. The tumor/liver activity ratios (RSUVmax and RSUVmean) were tested as prognostic factors and compared to the following conventional prognostic factors: MILAN, CLIP, OKUDA, TNM stage, alphafoetoprotein level, portal thrombosis, size of the largest nodule, tumor differentiation, microvascular invasion, underlying cirrhosis and liver function. Results : The DFS was 87.2% at 1y and 72.1% at 3y. The OS was 85.2% at 1y and 80.7% at 3y. According to an univariate Cox model, RSUVmax, RSUVmean and healthy liver were predictors of DFS and RSUVmax, RSUVmean, size of the largest nodule, CLIP, liver involvement>50%, and healthy liver predicted the OS. According to a multivariate Cox model, only RSUVmax predicted DFS and RSUVmax and liver involvement>50% predicted OS. An ROC analysis of the ratios showed that the 1.15 cut-off for RSUVmax was best for predicting both the DFS (Cox regression:HR 14.4, p=0.02) and OS (HR 5.6, p=0.049). The Kaplan-Meier curves and Logrank tests confirmed those results. Even though the MILAN criteria alone were not predictive, it is worth noting that none of the patients outside the MILAN criteria and with RSUVmax<1.15 relapsed. Conclusions: The RSUVmax is a strong prognostic factor for recurrence and death in patients with HCC treated by liver transplantation with a cut-off value of 1,15. further prospective studies should test whether the metabolic index should be systematically included in the preoperative assessment. [less ▲]Detailed reference viewed: 13 (4 ULg) Case report : un cas de glioblastome intra-médullaire chez un enfant de 12 ansBARREA, Christophe ; RAMAEKERS, Vincent ; OTTO, Bernard et alConference (2014, March)Detailed reference viewed: 26 (3 ULg) Embodying the divine: herms in Greek vase-paintingCollard, Hélène Conference (2014, March)Detailed reference viewed: 12 (0 ULg) Sea ice CO2 flux in the Southern Ocean during mid-winter and early springNomura, D.; Delille, Bruno ; Dieckmann, G.S. et alConference (2014, March)There seems little doubt that sea ice is permeable to CO2 and other gases although air–sea ice gas flux is more or less inhibited at a brine volume fraction of less than 5% representing the threshold for ... [more ▼]There seems little doubt that sea ice is permeable to CO2 and other gases although air–sea ice gas flux is more or less inhibited at a brine volume fraction of less than 5% representing the threshold for fluid permeability of sea ice. Generally, air–sea ice CO2 flux is at its minimum in winter due to low sea ice temperatures and consequently reduced permeability despite the fact the partial pressure of CO2 in sea ice is usually high at that time and sea ice has therefore the potential to release CO2 to the atmosphere. Here, we present first evidence that snow laden Antarctic sea ice can act as source for atmospheric CO2 even during mid-winter and early spring. During a mid-winter cruise to the Weddell Sea (AWECS, 2013) and an early spring cruise off east Antarctica (SIPEX-2, 2012), due to thick insulating snow covers, the bottom of the snow and the surface of the sea ice were relatively warm (>–10°C) even though air temperature was sometimes below –30°C. In addition, in both areas, sea ice was characterized by high bulk-salinities, resulting in brine volume fractions that are generally higher than 5%. Automatic “open-closed” chamber measurements indicated positive CO2 fluxes of up to +2.5 mmol C m–2 day–1, illustrating that sea ice acted as a source of atmospheric CO2. Higher fluxes were measured at bare ice surfaces after removing the snow. However, generally low snow densities (mean: 339 kg m–3), indicating a permeable snow cover, facilitated degassing of CO2 at the snow-air interface. Our results therefore suggest that even in the winter and early spring, Antarctic sea ice can act as CO2 source for the atmosphere, particularly in areas with a thick insulating snow cover. [less ▲]Detailed reference viewed: 56 (1 ULg) Dissection artérielle cérébrale chez l'enfantBARREA, Christophe ; RAMAEKERS, Vincent ; OTTO, Bernard et alConference (2014, March)Detailed reference viewed: 24 (3 ULg)