139 research outputs found
The Embodiment of Political Freedom:Spontaneous Movement, Plurality and the Ontological Constitution of Public Space
No full textThis article seeks to investigate the relation between bodies’ movements, political freedom and the ontological constitution and maintenance of public space, understood in the very material sense of the res publica, the public thing, particularly the question what inhibitions of movement in public space could tell us about the meaning of uninhibited movement for political freedom. The starting point of this inquiry into the political value of bodily movement are Hannah Arendt’s cursory remarks, that we find scattered throughout her work, about elementary corporeal capacity of free movement as basic to political freedom. Referring to Butler and Merleau-Ponty, it reconstructs Arendt’s account of the relation between our elementary free bodily movement, public space and political freedom. While this account proves very insightful, it also exposes a certain ambivalence about the political meaning of free movement. Further, the author argues that this ambivalence results from Arendt’s reluctance to radically think through the consequences of her account of the corporeal nature of free movement. Engaging with feminist criticisms of Arendt’s body-aversiveness (especially Judith Butler’s), she shows that it is not so much the vulnerable body, but the capable, including resisting, body that is missing in Arendt’s account of political freedom. For that reason, the author turns to Merleau-Ponty’s phenomenology of the body to argue that bodily free movement is not just negative, but could have a positive meaning as a political ‘practice of freedom’
Doping-driven metal-insulator transitions and charge orderings in the extended Hubbard model
No full textWe perform a thorough study of the extended Hubbard model featuring local and nearest-neighbor Coulomb repulsion. Using the dynamical mean-field theory we investigated the zero-temperature phase diagram of this model as a function of the chemical doping. The interplay between local and nonlocal interactions drives a variety of phase transitions connecting two distinct charge-ordered insulators, i.e., half filled and quarter filled, a charge-ordered metal and a Mott-insulating phase. We characterize these transitions and the relative stability of the solutions and we show that the two interactions conspire to stabilize the quarter-filled charge-ordered phase
The Embodiment of Political Freedom: Spontaneous Movement, Plurality and the Ontological Constitution of Public Space
No full textThis article seeks to investigate the relation between bodies’ movements, political freedom and the ontological constitution and maintenance of public space, understood in the very material sense of the res publica, the public thing, particularly the question what inhibitions of movement in public space could tell us about the meaning of uninhibited movement for political freedom. The starting point of this inquiry into the political value of bodily movement are Hannah Arendt’s cursory remarks, that we find scattered throughout her work, about elementary corporeal capacity of free movement as basic to political freedom. Referring to Butler and Merleau-Ponty, it reconstructs Arendt’s account of the relation between our elementary free bodily movement, public space and political freedom. While this account proves very insightful, it also exposes a certain ambivalence about the political meaning of free movement. Further, the author argues that this ambivalence results from Arendt’s reluctance to radically think through the consequences of her account of the corporeal nature of free movement. Engaging with feminist criticisms of Arendt’s body-aversiveness (especially Judith Butler’s), she shows that it is not so much the vulnerable body, but the capable, including resisting, body that is missing in Arendt’s account of political freedom. For that reason, the author turns to Merleau-Ponty’s phenomenology of the body to argue that bodily free movement is not just negative, but could have a positive meaning as a political ‘practice of freedom’
Endoscopie surveillance of Barrett's esophagus
No full textL'endobrachyœsophage ou œsophage de Barrett est une entité caractérisée par le remplacement de la muqueuse malpighienne de l'œsophage distal par une muqueuse de type glandulaire. Le principal risque évolutif de cette métaplasie est représenté par la dégénérescence en adénocarcinome. Les adénocarcinomes sur endobrachyœsophage sont généralement diagnostiqués à un stade évolué et leur pronostic pourrait en théorie être amélioré par un dépistage précoce. Une surveillance endoscopique des œsophages de Barrett est donc recommandée afin de dépister ces cancers à un stade infra-clinique potentiellement curable. La stratégie de surveillance classique consiste à détecter des lésions dysplasiques par des biopsies multiples régulièrement espacées de la muqueuse de Barret
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No full textThe effects of the next-nearest-neighbour density-density interaction in the atomic limit of the extended Hubbard model
No full textThis is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter.
IOP Publishing Ltd. is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0953-8984/23/10/105601We have studied the extended Hubbard model in the atomic limit. The Hamiltonian analyzed consists of the effective on-site interaction U and the intersite density-density interactions Wij (both: nearest-neighbour and next-nearest-neighbour). The model can be considered as a simple effective model of charge ordered insulators. The phase diagrams and thermodynamic properties of this system have been determined within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. Our investigation of the general case taking into account for the first time the effects of longer-ranged density-density interaction (repulsive and attractive) as well as possible phase separations shows that, depending on the values of the interaction parameters and the electron concentration, the system can exhibit not only several homogeneous charge ordered (CO) phases, but also various phase separated states (CO-CO and CO-nonordered). One finds that the model considered exhibits very interesting multicritical behaviours and features, including among others bicritical, tricritical, critical-end and isolated critical points
Superconductivity, Charge Density Wave and Charge Kondo States in Systems of Coexisting Itinerant Electrons and Local Pairs
No full textThe properties of a system of coexisting local pairs and itinerant electrons described by the (hard-core) boson-fermion model are discussed. For the first time we include into analysis of the model not only the superconducting and non-ordered (normal) states but also the charge density wave phases as well as the so-called charge Kondo state. Within an extended mean-field approximation, a mutual stability of charge density wave, superconducting and charge Kondo states are determined at T = 0 in the case of half-filled fermionic and bosonic bands
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