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« Étudier les classes inversées en mathématiques. Préalables méthodologiques sur les cours : le cas particulier des "capsules" »
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La contradiction des actes de l'état civil, motif de renversement de la présomption de l'art. 47 c. civ.
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Vivre avec son parent biologique n'est pas nécessairement conforme à l'intérêt de l'enfant
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Trajet du « nous » dans le récit contemporain d'Yvan Pommaux à Léonora Miano
No full textInternational audienceActes du colloque international « L’écriture de la migration dans la littérature et le cinéma contemporains pour adultes et pour enfants : frontières, passages, errances et figures du tragique moderne », Anne Schneider, Magali Jeannin, Yann Calvet, Marie Cleren (dir.), Laslar EA 4256, Université de Caen-Normandie, 21-22-23 novembre
Zero-error source coding when side information may be present
No full textInternational audienceZero-error source coding when side-information (SI) may be present is a fundamental building block of interactive real-world compression systems. In such a scenario, the side information may represent an image that could have been requested previously by the user. We aim at designing a two layer zero-error coding scheme that adapts to the presence or not of the side information at the decoder. The scenario we consider involves two decoders and two noiseless channels, the first channel to both decoder and the second channel of additional information to decoder 2 only. The side information is available at the encoder and decoder 1, but not at decoder 2. By using a random coding argument we characterize the zero-error achievable rate region. The code construction relies on coset partitioning obtained from a linear code. The encoder sends the coset of the source sequence on the first channel to all decoders, and sends the index of the source sequence in its coset on the second channel to decoder 2
Relativistic spin-0 particle in a box: Bound states, wave packets, and the disappearance of the Klein paradox
No full textInternational audienceThe “particle-in-a-box” problem is investigated for a relativistic particle obeying the Klein–Gordon equation. To find the bound states, the standard methods known from elementary non-relativistic quantum mechanics can only be employed for “shallow” wells. For deeper wells, when the confining potentials become supercritical, we show that a method based on a scattering expansion accounts for Klein tunneling (undamped propagation outside the well) and the Klein paradox (charge density increase inside the well). We will see that in the infinite well limit, the wave function outside the well vanishes, and Klein tunneling is suppressed: Quantization is, thus, recovered, similar to the non-relativistic particle in a box. In addition, we show how wave packets can be constructed semi-analytically from the scattering expansion, accounting for the dynamics of Klein tunneling in a physically intuitive way
Des limites McKean-Vlasov dirigées par des bruits blancs pour des systèmes de particules avec des sauts simultanés et aléatoires
No full textInternational audienceWe study the convergence of particle systems described by SDEs driven by Brownian motion and Poisson random measure, where the coefficients depend on the empirical measure of the system. Every particle jumps with a jump rate depending on its position and on the empirical measure of the system. Jumps are simultaneous, that is, at each jump time, all particles of the system are affected by this jump and receive a random jump height that is centred and scaled in This particular scaling implies that the limit of the empirical measures of the system is random, describing the conditional distribution of one particle in the limit system. We call such limits {\it conditional McKean-Vlasov limits}. The conditioning in the limit measure reflects the dependencies between coexisting particles in the limit system such that we are dealing with a {\it conditional propagation of chaos property}. As a consequence of the scaling in and of the fact that the limit of the empirical measures is not deterministic the limit system turns out to be solution of a non-linear SDE, where not independent martingale measures and white noises appear having an intensity that depends on the conditional law of the process.Nous étudions la convergence de systèmes de N particules décrits par des EDS dirigées par des mouvements browniens et des mesures de Poisson, où les coefficients dépendent de la meure empirique du système. Chaque particule saute avec une intensité qui dépend de sa position et de la mesure empirique du système. Les sauts sont simultanés, c'est-à-dire qu'à chaque instant de saut, toutes les particules du système sont affectées par ce saut et reçoivent une amplitude de saut aléatoire centrée normalisée en Cette normalisation particulière implique que la limite des mesures empiriques des systèmes est aléatoire, étant la loi conditionnelle d'une particule du système limite. Nous appelons de telles limites {\it limite McKean-Vlasov conditionnelle}. Le conditionnement dans la mesure limite reflète les dépendances entre les particules co-existantes dans le système limite de telle sorte qu'il s'agit d'une {\it propagation du chaos conditionnelle}. A cause de la normalisation en et du fait que la limite des mesures empiriques n'est pas déterministe, le système limite est solution d'une EDS non-linéaire, où des mesures martingales et des bruits blancs non-indépendants apparaissent avec des intensités qui dépendent de la loi conditionnelle du processus
Genocide in Bangladesh - The politics of Disinformation
No full textFor the whole eleven years during which I have been actively engaged in South Asia, nothing touched me more than the Bangladeshi people’s struggle for memory, justice, and accountability regarding the Genocide perpetrated against Bangladesh by the Pakistani military authorities. This genocide, organised in tandem with Islamic fanatic organisations from both West and East Pakistan, was meant to destroy the Bengali identity by murdering elites, destroying religious diversity, and raping women. […