794 research outputs found

    The response to the Dieudonné affair in France risks demonising French minority groups in the name of tolerance

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    The French comedian DieudonnĂ© M’Bala M’Bala has caused controversy in France over the alleged anti-Semitism of his performances. Paul A. Silverstein writes on the wider issues related to anti-Semitism in French society, and why DieudonnĂ© has proved so controversial. He argues that while Dieudonné’s supporters deny the accusations of anti-Semitism, they feed into a broader social and institutional context that can make Jewish citizens feel targeted. There is also a danger that in attacking DieudonnĂ©, the French establishment risks demonising other French minority groups who make up many of his supporters

    Bruce Maddy-Weitzman, Amazigh Politics in the Wake of the Arab Spring

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    Amazigh Activism and the Moroccan State

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    Copper(0)-mediated radical polymerisation in a self-generating biphasic system

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    Herein, we demonstrate the synthesis of well-defined poly(n-alkyl acrylate)s via copper(0)-mediated radical polymerisation in a self-generating biphasic system. During the polymerisation of n-butyl acrylate in DMSO, the polymer phase separates to yield a polymer-rich layer with very low copper content (ICP-MS analysis: 0.016 wt%). The poly(n-butyl acrylate) has been characterized by a range of techniques, including GPC, NMR and MALDI-TOF, to confirm both the controlled character of the polymerisation and the end group fidelity. Moreover, we have successfully chain extended poly(n-butyl acrylate) in this biphasic system several times with n-butyl acrylate to high conversion without intermediate purification steps. A range of other alkyl acrylates have been investigated and the control over the polymerisation is lost as the hydrophobicity of the polymer increases due to the increase in alkyl chain length indicating that it is important for the monomer to be soluble in the polar solvent

    Universal de Sitter solutions at tree-level

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    Type IIA string theory compactified on SU(3)-structure manifolds with orientifolds allows for classical de Sitter solutions in four dimensions. In this paper we investigate these solutions from a ten-dimensional point of view. In particular, we demonstrate that there exists an attractive class of de Sitter solutions, whose geometry, fluxes and source terms can be entirely written in terms of the universal forms that are defined on all SU(3)-structure manifolds. These are the forms J and Omega, defining the SU(3)-structure itself, and the torsion classes. The existence of such universal de Sitter solutions is governed by easy-to-verify conditions on the SU(3)-structure, rendering the problem of finding dS solutions purely geometrical. We point out that the known (unstable) solution coming from the compactification on SU(2)x SU(2) is of this kind.Comment: 20 pages, 3 figures, v2: added reference

    Appeals to semiotic registers in ethno-metapragmatic accounts of variation

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    Discussions of folklinguistic accounts of language use are frequently focused on dismissing them because of their limitations. As a result, not a lot is written regarding how such accounts are done and how they ‘work’. This article examines how folklinguistic evaluations are achieved in interaction, particularly through appeals to semiotic registers (Agha 2007). It describes how in explaining their beliefs regarding linguistic variation, speakers frequently produce voicings with varying transparency. These rely on understandings of the social world and bring large collections of linguistic resources into play. They offer rich insights if analytic attention is given to their details because even when evaluating a single variant, whole ways of speaking, and even being, may be utilized. The paper explores in turn how analysis reveals the inseparability of variants, understandings of context and audience, the relationship between linguistic forms and social types, and the performance of social types via the evaluation of semiotic resources. In each section, discussion is grounded in extracts from interviews on Australian English with speakers of this variety of English. Cumulatively they show the primacy of semiotic registers in ethno-metapragmatic accounts.N/

    D-brane Dynamics in RR Deformation of NS5-branes Background and Tachyon Cosmology

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    We study D-brane dynamics in the gravity dual background of ODp theories using the effective action on the worldvolume of the brane. We explore the similarities of the system with the rolling tachyon, including the exponential decrease of pressure at late times. We also consider the case where the worldvolume theory on a D3-brane is coupled to gravity and construct a cosmological model. By considering the time reversal symmetric solutions, we find that we can have both closed and open universes depending on the initial value of the radial mode on the brane. We compare the models with tachyon driven cosmologies and find limits where slow roll inflation is realized.Comment: 24 pages, 5 figures, a subsection added on Maldacena-Nunez background. To be published in Nuclear Physics
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