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See detailA Mixed Integer Programming formulation for the three dimensional bin packing problem deriving from an air cargo application
Paquay, Célia ULg; Schyns, Michael ULg; Limbourg, Sabine ULg

in International Transactions in Operational Research (2016), 23(1-2), 187-213

The present paper looks into the problem of optimising the loading of boxes into containers. The goal is to minimise the unused volume. This type of problem belongs to the family of Multiple Bin Size Bin ... [more ▼]

The present paper looks into the problem of optimising the loading of boxes into containers. The goal is to minimise the unused volume. This type of problem belongs to the family of Multiple Bin Size Bin Packing Problems. The approach includes an extensive set of constraints encountered in real-world applications in the three-dimensional case: the stability, the fragility of the items, the weight distribution and the possibility to rotate the boxes. It also includes the specific situation in which containers are truncated parallelepipeds. This is typical in the field of air transportation. While most papers on cutting and packing problems describe ad-hoc procedures, this paper proposes a mixed integer linear program. The validity of this model is tested on small instances. [less ▲]

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See detailHegel anthropologue
Lejeune, Guillaume ULg

Book published by CNRS-éditions (2016)

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See detailDSIMA: A testbed for the quantitative analysis of interaction models within distribution networks
Mathieu, Sébastien ULg; Louveaux, Quentin ULg; Ernst, Damien ULg et al

in Sustainable Energy, Grids and Networks (2016), 5

This article proposes an open-source testbed to simulate interaction models governing the exchange of flexibility services located within a distribution network. The testbed is an agent-based system in ... [more ▼]

This article proposes an open-source testbed to simulate interaction models governing the exchange of flexibility services located within a distribution network. The testbed is an agent-based system in which the distribution system operator, the transmission system operator, producers and retailers make their decisions based on mixed-integer linear programs. This testbed helps to highlight the characteristics of an interaction model, the benefits for the agents and eases the detection of unwanted or abusive behaviors which decreases the welfare. The testbed is implemented in Python and the optimization problems are encoded in the modeling language ZIMPL. A web interface is coupled with an instance generator using macroscopic parameters of the system such as the total power production. This testbed is, therefore, well suited to test the implemented interaction models on various scenarios and to extend the implementation to other models. Five interaction models developed with industrial partners are simulated over a year on a 75-bus test system. Simulations show that interaction models relying on active network management, as they have been developed, lead to substantial welfare even though they suffer from a lack of coordination between the DSO and the TSO. A conservative interaction model restricting grid users to an access range that is computed ahead of time to prevent any congestion, avoids shedding distributed generation but considerably restrains the amount of distributed production. [less ▲]

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See detailRisk factors and effect of selective removal on retroviral infections prevalence in Belgian stray cats.
Garigliany, Mutien-Marie ULg; Jolly, Sandra ULg; Dive, M. et al

in The Veterinary record (2016), 178(2), 45

The aim of this study was to evaluate the effect of several risk/protective factors and predictors on the prevalence of feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV) infections in ... [more ▼]

The aim of this study was to evaluate the effect of several risk/protective factors and predictors on the prevalence of feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV) infections in 302 stray cats captured during a trap-neuter-release programme in a mixed urban-rural area from Belgium, from 2010 to 2012. The impact of selective removal of FIV-positive cats on the apparent prevalence in the remaining population over this three-year period was also assessed. The seroprevalences over three years were 18.8 per cent for FIV and 0.7 per cent for FeLV. For FIV, the seroprevalence decreased significantly from the first year of the programme (2010; 30.5 per cent) to the last (2012; 13.1 per cent). Sex (male) and age (adult and old cats) were risk factors, while the year of sampling (years 2011 and 2012) was a protective factor. Age, sex and location were the most relevant predictors of FIV status. The data presented in this study revealed a very high FIV seroprevalence in Belgian stray cats, while FeLV was almost absent. The selective removal of positive cats had a drastic effect on the FIV seroprevalence in the remaining cat population. [less ▲]

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See detailAnalyzing but Not Buying: The Mere Exposure Effect on Children’s Behavior in an Ecological Context
Geurten, Marie ULg; Geurten, Claire ULg; Willems, Sylvie ULg

Poster (2016)

The mere exposure effect is usually considered a robust phenomenon whereby people’s attitudes can easily be influenced. However, recent studies suggest that some conditions must be met for this effect to ... [more ▼]

The mere exposure effect is usually considered a robust phenomenon whereby people’s attitudes can easily be influenced. However, recent studies suggest that some conditions must be met for this effect to emerge. In this experiment, the influence of the features of a specific material on the mere exposure effect was examined in an ecological context. Children were told that they would play a game during which they would have to buy several items in different shops. In these shops, half of the participants were incidentally exposed to two target stimuli. During a subsequent judgment phase, the target stimuli were presented to each child, either with perceptually similar items or with perceptually dissimilar items. Prior encounter with an item only influenced children’s preference choices when the test items were dissimilar. These findings are discussed in terms of the processing styles that are necessary for the mere exposure effect to appear. [less ▲]

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See detailShort term impact of selective logging on western lowland gorilla
Haurez, Barbara ULg; Tagg, Nikki; Petre, Charles-Albert ULg et al

in Forest Ecology & Management (2016), 364

Selective timber production is implemented over a large proportion of the world’s tropical forests. Within these forest ecosystems, the frugivore community contributes important ecological services ... [more ▼]

Selective timber production is implemented over a large proportion of the world’s tropical forests. Within these forest ecosystems, the frugivore community contributes important ecological services through animal-mediated seed dispersal. However, there is no clear understanding of the impacts of logging on wildlife or of the extent to which seed dispersal is preserved in logged forests. Given its tendency for nesting in light gaps, the western lowland gorilla is likely to provide directed-dispersal services to a wide range of tree species. Production forests preserved from poaching have been reported to harbor high densities of gorillas, but the monitoring of gorilla populations subjected to logging is poorly documented. This study investigated gorilla density and nesting behavior after timber exploitation in a logging concession in southeast Gabon. Nest count censuses were performed on line transects, before and after the second felling cycle. Gorilla density dropped from 1.5 (116.7 nests km 2, 95% CI = 83.4–163.5) to 1.0 (64.9 nests km 2, % CI = 32.6–129.5) weaned gorilla km 2 4–6 months after logging, then rose to 2.6 (176.3 nests km 2, 95% CI = 113.5–274.1) gorillas km 2 9–11 months after logging. A consistent preference for nesting in open canopy terra firma forest was observed during all censuses. This study demonstrates the short-term resilience of the western lowland gorilla to selective timber harvesting, and argues that they offer a continued contribution to directed-dispersal services within months after logging. Although a long-term monitoring of gorillas in a logged forest should be undertaken, the role of this species in logged forest recovery is thought to be important. The preservation of gorilla should receive particular consideration by forest managers. [less ▲]

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See detail27 entrées du dictionnaire (Adorno, Bataille, Benjamin, Brecht, Burckhardt, etc.)
Hagelstein, Maud ULg

in Talon-Hugon, Carole (Ed.) Dictionnaire des théoriciens de l'art (2016)

Les notices du dictionnaire que je prends en charge : Adorno, Bataille, Benjamin, Burckhardt, Cassirer, Chastel, Deleuze, Dilthey, Faure, Focillon, Foucault, Francastel, Freud, Kracauer, Luckacs, Malraux ... [more ▼]

Les notices du dictionnaire que je prends en charge : Adorno, Bataille, Benjamin, Burckhardt, Cassirer, Chastel, Deleuze, Dilthey, Faure, Focillon, Foucault, Francastel, Freud, Kracauer, Luckacs, Malraux, Nietzsche, Panofsky, Riegl, Rousseau, Simmel, Valery, Vasari, Winkelman, Wölfflin, Worringer, Warburg. [less ▲]

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See detailAby Warburg, Textes & Fragments (1926-1929) suivi de "Plasticité du visuel. Montages et usages critiques de l'image chez A. Warburg" (M. Hagelstein)
Hagelstein, Maud ULg; Letawe, Céline ULg

Book published by Presses Universitaires de Liège (2016)

Assorti d’une série de textes inédits, cet ouvrage monographique vise à faire connaître dans le milieu francophone les écrits d’Aby Warburg (1866-1929), en particulier ceux rédigés dans les dernières ... [more ▼]

Assorti d’une série de textes inédits, cet ouvrage monographique vise à faire connaître dans le milieu francophone les écrits d’Aby Warburg (1866-1929), en particulier ceux rédigés dans les dernières années de sa vie. Peu connus, ces textes datent de la période d’élaboration de l’Atlas d’images Mnemosyne – Atlas dont le succès grandissant auprès des artistes et des théoriciens de l’art n’est plus à démontrer . Mais si Mnemosyne attire de plus en plus les spécialistes des images de tous horizons, on accorde encore peu d’intérêt aux textes et aux notes rédigées par son auteur dans les années 1926-1929. Ces textes auraient du accompagner les planches de l’Atlas si le projet avait abouti. Or, les manuscrits inédits conservés au Warburg Institute (Londres) montrent la portée philosophique des recherches tardives d’Aby Warburg. Il y développe une théorie culturelle de l’image pour le moins originale et qui a profondément influencé certaines démarches plus contemporaines (dans les domaines de l’histoire de l’art, de l’anthropologie du visuel, de la Bildwissenschaft allemande ou des Visual Studies anglo-saxonnes). À l’occasion d’un débat avec les pensées de Nietzsche et de Burckhardt, Warburg élabore une conception nouvelle de la Kultur. [less ▲]

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See detailTowards an Australian Philosophy. Constructive Appropriation of Enlightenment Thinking in Murray Bail's The Pages
Herbillon, Marie ULg

in Tunca, Daria; Wilson, Janet (Eds.) Under Construction. Postcolonial Gateways and Walls (2016)

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See detailDépasser le paradoxe évolutionniste de la schizophrénie : psychopathologie éthologique et adaptation perpétuelle
Englebert, Jérôme ULg

in Englebert, Jérôme; Follet, Valérie (Eds.) Adaptation : Essai collectif à partir des paradigmes éthologiques et évolutionnistes (2016)

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See detailL’enfant, l’institutrice et le tableau interactif : Corps relationnel et évolution numérique
Jadin, Aurore ULg; Englebert, Jérôme ULg

in Cahiers de Psychologie Clinique (2016), 46

In clinical psychology, the ecological observation of child in different life domains offers many inaccessible observations through the individual therapy sessions. The article proposes, from a clinical ... [more ▼]

In clinical psychology, the ecological observation of child in different life domains offers many inaccessible observations through the individual therapy sessions. The article proposes, from a clinical case, a reflection on the technological change of classes, particularly through the use of the interactive whiteboard, and the psychological and relational consequences of this revolution, for each of the protagonists. A consequence of this use of the digital device is that the body can appear less necessary and therefore be abandoned in favor of a poorly invested technicality. Our analysis values the development of a necessary compromise between digital and body. It proposes to find ways of arranging so that teacher's body is still a fundamental dimension of the educational process. [less ▲]

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See detailDes situations-limites au dépassement de la situation : phénoménologie d'un concept sartrien
Cormann, Grégory ULg; Englebert, Jérôme ULg

in Sartre Studies International (2016), 22(1),

Dans cet article, nous explorons le concept de situation, en-deçà et au-delà de sa thématisation par Sartre, à partir de L’imaginaire, dans les Carnets de la drôle de guerre puis dans L’être et le néant ... [more ▼]

Dans cet article, nous explorons le concept de situation, en-deçà et au-delà de sa thématisation par Sartre, à partir de L’imaginaire, dans les Carnets de la drôle de guerre puis dans L’être et le néant. Notre approche se fonde sur un double mouvement : d’une part, une archéologie du concept dans le contexte de la première percée de la phénoménologie en France dans les années 1930 ; d’autre part, une attention à son possible dépassement deux décennies plus tard. Dans une relation serrée avec les développements de la psychopathologie de son temps, il s’agit d’abord de situer la prétention de l’Esquisse d’une théorie des émotions à poser les bases d’une phénoménologie de « l’homme en situation », ensuite d’éclairer la reprise critique du concept dans Questions de méthode, dans l’exposition de la méthode progressive-régressive. En somme, il s’agit de montrer comment s’élabore progressivement chez Sartre une « herméneutique de l’existence » qui fait droit à la liberté, puis se donne les moyens d’en suivre l’action effective dans le monde. [less ▲]

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See detailOnline Learning for Strong Branching Approximation in Branch-and-Bound
Marcos Alvarez, Alejandro ULg; Wehenkel, Louis ULg; Louveaux, Quentin ULg

E-print/Working paper (2016)

We present an online learning approach to variable branching in branch-and-bound for mixed-integer linear problems. Our approach consists in learning strong branching scores in an online fashion and in ... [more ▼]

We present an online learning approach to variable branching in branch-and-bound for mixed-integer linear problems. Our approach consists in learning strong branching scores in an online fashion and in using them to take branching decisions. More specifically, numerical scores are used to rank the branching candidates. If, for a given variable, the learned approximation is deemed reliable, then the score for that variable is computed thanks to the learned function. If the approximation is not reliable yet, the real strong branching score is used instead. The scores that are computed through the real strong branching procedure are fed to the online learning algorithm in order to improve the approximated function. The experiments show promising results. [less ▲]

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See detailLA PARTICIPATION DES USAGERS COMME LEVIER DE L’INNOVATION DANS LES SERVICES PUBLICS : LE CAS DE LA GÉOMATIQUE WALLONNE
Fallon, Catherine ULg; Calay, Vincent

in Pyramides : Revue du Laboratoire d'Etudes et de Recherches en Administration Publique (2016)

La numérisation des données géographiques est une de ces techniques récentes qui transforment à la fois la structure politico-administrative et la construction des politiques elles-mêmes en transformant ... [more ▼]

La numérisation des données géographiques est une de ces techniques récentes qui transforment à la fois la structure politico-administrative et la construction des politiques elles-mêmes en transformant le réseau d’action publique. Ces données peuvent être utilisées dans la plupart des politiques, pourvu que les questions de distribution territoriales y soient pertinentes : on parle en ce sens d’une « géomatisation » de l’action publique. Le cadre européen avec la directive INSPIRE a donné l’impulsion et définit le cadre de référence pour une refonte des processus de production et de diffusion des données géographiques numériques. Les états doivent chacun établir une infrastructure de données géographiques numériques pour assurer l’interopérabilité entre bases de données et faciliter la diffusion, la disponibilité, l'utilisation et la réutilisation de l’information géographique au niveau de leur territoire et en Europe. En Belgique, ce sont les régions - et le niveau fédéral pour ses compétences - qui ont hérité de cette responsabilité : leurs données doivent être mises à disposition des utilisateurs, qu’ils soient décideurs ou citoyens dans des formats harmonisés afin d'en faciliter l'utilisation par tous et il faut aussi définir les principes d’échange, de tarification et les conditions d’utilisation propres à faciliter l’accès aux données et aux services en ligne. Les données géographiques numérisées ont ceci de particulier qu’elles sont produites de façon décentralisées par des acteurs publics mais aussi privés, lesquels cherchent à peser sur les choix stratégiques des autorités régionales. Au niveau de la Région wallonne a été mis en place récemment un ensemble de structure de coopération avec les usagers, les entreprises, et les autorités locales. L’administration a créé en son sein des groupes de travail transversaux pour améliorer l’intégration entre les approches thématiques contrôlées par les différentes directions. Le projet d’article trouve son origine dans l’accompagnement assuré par le SPIRAL au Département de la géomatique de la Région wallonne dans le cadre de la rédaction du plan stratégique et du plan opérationnel de la géomatique wallonne (2013-2015). L’article prendra appui sur les principes de la sociologie de la traduction (Callon, 1986) pour proposer une analyse des lieux et des processus qui contribuent à mettre en place une « gouvernance en réseau » mobilisant une logique d’innovation publique (Sørensen et al. 2011), sans suspendre pour autant les formes de coordination hiérarchiques et contractuelles. [less ▲]

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See detailLa médiation animale comme dispositif technique
de Villers Grand Champs, Bénédicte ULg; Servais, Véronique ULg

in Servais, Christine (Ed.) La médiation. De la théorie aux terrains (2016)

Les pratiques thérapeutiques associant des animaux sont-elles des techniques thérapeutiques comme les autres ? Quelles sont les particularités de cette « médiation animale » dès lors que l’agent médiateur ... [more ▼]

Les pratiques thérapeutiques associant des animaux sont-elles des techniques thérapeutiques comme les autres ? Quelles sont les particularités de cette « médiation animale » dès lors que l’agent médiateur, l’animal, est vivant et partiellement ignorant du dispositif dans lequel il est inscrit ? Nous faisons ici l’hypothèse que les pratiques de médiation animale peuvent s’inscrire dans l’horizon de ce que Leroi-Gourhan nommait le « milieu technique », le « mi-lieu », cet entre-deux qui assure la rencontre, la mise en relation d’un vivant et de son monde. Ce mi-lieu n’a rien d’un cordon, même symbolique, qui relierait le patient, l’intervenant et l’animal. Il se présente plutôt sous la forme d’un écotone, du nom des écosystèmes qui se développent à la lisière de deux écosystèmes différents et dont l’écosystème côtier est le meilleur exemple. Nous nous appuyons sur les concepts de technique, de technique du corps, d’espace potentiel et de rituel pour essayer de comprendre ce processus de médiation dont un vivant animal est partie prenante et comment il se fait que des rencontres animales recèlent un potentiel thérapeutique [less ▲]

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See detailProcedural learning, consolidation, and transfer of a new skill in Developmental Coordination Disorder
Lejeune, Caroline ULg; Wansard, Murielle ULg; Geurten, Marie ULg et al

in Child Neuropsychology : A Journal on Normal & Abnormal Development in Childhood & Adolescence (2016), 22(2),

The aim of this study was to explore the differences in procedural learning abilities between children with DCD and typically developing children by investigating the steps that lead to skill ... [more ▼]

The aim of this study was to explore the differences in procedural learning abilities between children with DCD and typically developing children by investigating the steps that lead to skill automatization (i.e., the stages of fast learning, consolidation, and slow learning). Transfer of the skill to a new situation was also assessed. We tested 34 children aged 6–12 years with and without DCD on a perceptuomotor adaptation task, a form of procedural learning that is thought to involve the cerebellum and the basal ganglia (regions whose impairment has been associated with DCD) but also other brain areas including frontal regions. The results showed similar rates of learning, consolidation, and transfer in DCD and control children. However, the DCD children's performance remained slower than that of controls throughout the procedural task and they reached a lower asymptotic performance level; the difficulties observed at the outset did not diminish with practice. [less ▲]

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See detailAirewater interfacial properties of enzymatic wheat gluten hydrolyzates determine their foaming behavior
Wouters, Arno G.B.; Rombouts, Ine; Legein, Marie et al

in Food Hydrocolloids (2016), 55

Insight in the link between foaming and interfacial properties of proteins can increase their potential as functional agents in food systems. Here, foaming capacity and stability of structurally different ... [more ▼]

Insight in the link between foaming and interfacial properties of proteins can increase their potential as functional agents in food systems. Here, foaming capacity and stability of structurally different peptic and tryptic wheat gluten hydrolyzates were related to the kinetics of their adsorption at an airewater interface as well as to the properties of a compressed protein film at this interface. Foams from degree of hydrolysis (DH, i.e. the percentage of cleaved peptide bonds) 2 hydrolyzates were more stable than those from their DH 6 counterparts, and this at all protein concentrations tested. However, at protein concentrations from 0.010% to 0.050% (wprot/v), peptic DH 2 and 6 hydrolyzates had better foaming stability than their tryptic counterparts of the same DH. The opposite was observed when protein concentrations ranged from 0.050% to 0.150% (wprot/v). These observations can in part be explained by the molecular mass composition of the samples and, more importantly, by high levels of hydrophobic peptides in the DH 2 samples. The calculation of an average elasticity (up to 20e25 mN/m) from the variation in surface pressure for a variation in surface area in Langmuir isotherms showed that DH 2 samples had higher elasticity than DH 6 samples, which was in agreement with their foaming stabilities at various protein concentrations. Additionally, although not usually considered in literature, it seemed there was a correspondence between surface pressure at different protein surface concentrations and foaming stability at different protein concentrations. [less ▲]

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See detailThe Future of Ageing - Stakeholder Involvement on the Future of Care
Barland, Marianne; Delvenne, Pierre ULg; Rosskamp, Benedikt ULg

in Klüver, Lars; Øjvind Nielsen, Rasmus; Jørgensen, Marie Louise (Eds.) Policy-Oriented Technology Assessment Across Europe: Expanding Capacities (2016)

Barland et al. describe an example project showcasing the strengths of technology assessment methodology in structuring stakeholder dialogues in a cross-European context. The authors provide an in-depth ... [more ▼]

Barland et al. describe an example project showcasing the strengths of technology assessment methodology in structuring stakeholder dialogues in a cross-European context. The authors provide an in-depth account of the method design choices made and their underlying rationale. Beyond the buzzword, well-structured and transparent stakeholder dialogue can help to balance difficult issues of policy priority – in this case by balancing the contributions of technological innovation against social reorganization as a means of securing sustainable future health-care service for senior citizens. The article shows the added value of multi-site dialogues based in national debates but linked to the European policy development process [less ▲]

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See detailMaking Technology Assessment Accessible to New Players
Delvenne, Pierre ULg; Rosskamp, Benedikt ULg; Fitzgerald, Ciara et al

in Klüver, Lars; Nielsen, Rasmus; Jorgensen, Marie-Louise (Eds.) Policy-Oriented Technology Assessment Across Europe. Expanding Capacities (2016)

This chapter reports on the two PACITA summers schools, which were aimed at teaching TA as well as enhancing mutual-learning activities. The first summer school concentrated on the topic ‘Renewable Energy ... [more ▼]

This chapter reports on the two PACITA summers schools, which were aimed at teaching TA as well as enhancing mutual-learning activities. The first summer school concentrated on the topic ‘Renewable Energy Systems- role and use of PTA’ and it was held in Liege in June 2012. The second summer school addressed the topic of ‘Ageing and Technology’, and was held in Cork in June 2014. We describe the rationale and format of the summer school in order to present a comprehensive account of how it was introduced TA, both its rational and its methods, to a new audience. We argue that as the responsible innovation agenda continues to gain traction among policy makers, societal actors and academics, education initiatives such as TA summer schools can have an important role to play in the future of the governance of science, technology and innovation. [less ▲]

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See detail"Passer la ligne" : La rencontre de Fanon et de Sartre
Cormann, Grégory ULg

in Luneau, Marie-Pier; Saint-Amand, Denis (Eds.) La Préface. Formes, enjeux et effets d’un discours d’escorte (2016)

À partir de 1948, où il donne des préfaces à l’Anthologie de la nouvelle poésie nègre et malgache et à l’antiroman de Nathalie Sarraute, Portrait d’un inconnu, jusqu’au début des années 1970, Sartre a ... [more ▼]

À partir de 1948, où il donne des préfaces à l’Anthologie de la nouvelle poésie nègre et malgache et à l’antiroman de Nathalie Sarraute, Portrait d’un inconnu, jusqu’au début des années 1970, Sartre a écrit une quinzaine de préfaces. Dans plusieurs cas, ces préfaces sont comme indissociables de l’ouvrage préfacé ; on leur reproche souvent d’avoir pris le dessus sur celui-ci. Il s’agit ici de relire la préface de Sartre aux Damnés de la terre de Frantz Fanon. Cette préface, peut-être la plus célèbre, sûrement la plus scandaleuse, est souvent réduite à l’invitation à la violence libératrice qu’on y trouve ou croit y trouver, sans qu’il ne semble guère utile de relire le texte de Sartre, une fois pour toutes saisi dans une posture d’aveu. En partant de l’unique rencontre de Fanon et de Sartre à Rome, à l’été 1961, il s’agit, plus précisément, de comprendre la « collaboration » qui se noue alors entre les deux hommes : à savoir de comprendre de quelles façons Sartre construit sa préface en prenant sur lui une certaine histoire de la littérature noire (Maran, Wright, Fanon) qui lui permet, à partir de cette rencontre à la mort, de (presque) confondre sa situation avec celle de Fanon. Dans ce texte-bilan d’une décennie d’engagement jusqu’à l’épuisement, Sartre trouve en même temps la possibilité de réécrire « Orphée noir », à partir des romans contemporains de Boris Vian et de Richard Wright, et de réécrire Fanon lui-même en l’envisageant au futur à partir de Peau noire, masques blancs. La littérature sartrien apparaît du coup non pas comme un abandon complaisant à la violence, mais comme une manière de regarder la réalité en face, ce que Qu’est-ce que la littérature ? désignait comme un art de (se) faire honte. [less ▲]

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