Exploiting Borders: The Political Economy of Local Backlash against Undocumented Immigrants

Four years prior to Arizona\u27s passage of one of the most far-reaching pieces of anti-Latino immigrant legislation signed into law in decades,3 demands to seal off the border 4 were being made thousands of miles from the U.S.-Mexico divide. In 2006, Hazleton, Pennsylvania, passed equally harsh legislation aimed at keeping undocumented immigrants out of their community. During this time, commentators described the local backlash in Hazleton and other small cities across the United States as akin to the opening of a deep and profound fissure in the American landscape 5 wherein all immigration politics is local. 6 Yet, as the so-called immigration problem returns to its point of origin and the actual U.S.-Mexico border reclaims its place as the popular political referent from the more imaginary yet equally racialized borders of homogeneous interior cities, it appears that neither the Arizona law nor previous local-level legislation represent a new trend but rather an intensification of America\u27s growing anti-Latino immigrant backlash

Translation on Graphs: An Isometric Shift Operator

International audienceIn this letter, we propose a new shift operator for graph signals, enforcing that our operator is isometric. Doing so, we ensure that as many properties of the time shift as possible get carried over. Finally, we show that our operator behaves reasonably for graph signals

Signaux stationnaires sur graphe : étude d'un cas réel

National audienceBased on a real geographical dataset, we apply the stationarity characterisation of a graph signal, through the analysis of its spectral decomposition. In the course, we identify possible sources of non-stationarity and we elaborate on the impact of the graph used to model the structural coherence of the data.Sur un jeu de données géographiques réelles, nous appliquons la caractérisation de la propriété de stationnarité d'un signal sur graphe via l'analyse de ses coefficients spectraux. Nous identifions différentes sources possibles de non-stationnarité et isolons l'influence qu'a le graphe sous-jacent sur la cohérence structurelle des données

Traitement du Signal sur Graphe : Interprétation en termes de Filtre de l'Apprentissage Semi-Supervisé sur Graphe

National audienceNous montrons comment les outils de traitement du signal sur graphe peuvent dégager des notions de fréquences sur les graphes pour étudier des données portées par les nœud d'un graphe. Prenant l'exemple de l'apprentissage semi-supervisé, nous montrons alors qu'il peut s'interpréter comme le filtre d'un signal sur graphe

Graphe de contacts et ondelettes

National audienceLes infections nosocomiales sont une source importante de mortalité lors d'un séjour hospitalier. En particulier, les bactéries multi-résistantes telles que les staphilocoques dorés présentent un problème sanitaire croissant puisque le nombre de traitements antibiotiques efficaces s'amenuise. Cette étude a pour but de comprendre le processus épidémique au sein d'un hôpital sur une durée de plusieurs mois. Pour cela, nous utilisons des outils inspirés du traitement du signal et appliqués aux graphes pour en déduire les différentes dimensions spatio-temporelles des données

Hexagons and Correlators in the Fishnet Theory

We investigate the hexagon formalism in the planar 4d conformal fishnet theory. This theory arises from N=4 SYM by a deformation that preserves both conformal symmetry and integrability. Based on this relation, we obtain the hexagon form factors for a large class of states, including the BMN vacuum, some excited states, and the Lagrangian density. We apply these form factors to the computation of several correlators and match the results with direct Feynman diagrammatic calculations. We also study the renormalisation of the hexagon form factor expansion for a family of diagonal structure constants and test the procedure at higher orders through comparison with a known universal formula for the Lagrangian insertion.Comment: 63 page

Nitrogen isotopic fractionation during abiotic synthesis of organic solid particles

The formation of organic compounds is generally assumed to result from abiotic processes in the Solar System, with the exception of biogenic organics on Earth. Nitrogen-bearing organics are of particular interest, notably for prebiotic perspectives but also for overall comprehension of organic formation in the young solar system and in planetary atmospheres. We have investigated abiotic synthesis of organics upon plasma discharge, with special attention to N isotope fractionation. Organic aerosols were synthesized from N2-CH4 and N2-CO gaseous mixtures using low-pressure plasma discharge experiments, aimed at simulating chemistry occurring in Titan s atmosphere and in the protosolar nebula, respectively. Nitrogen is efficiently incorporated into the synthesized solids, independently of the oxidation degree, of the N2 content of the starting gas mixture, and of the nitrogen speciation in the aerosols. The aerosols are depleted in 15N by 15-25 permil relative to the initial N2 gas, whatever the experimental setup is. Such an isotopic fractionation is attributed to mass-dependent kinetic effect(s). Nitrogen isotope fractionation upon electric discharge cannot account for the large N isotope variations observed among solar system objects and reservoirs. Extreme N isotope signatures in the solar system are more likely the result of self-shielding during N2 photodissociation, exotic effect during photodissociation of N2 and/or low temperature ion-molecule isotope exchange. Kinetic N isotope fractionation may play a significant role in the Titan s atmosphere. We also suggest that the low delta15N values of Archaean organic matter are partly the result of abiotic synthesis of organics that occurred at that time

Extraction des paramètres électriques sur les transistors CMOS de technologies avancées

Session POSTER 3L'extraction des paramètres électriques est un point clef pour la compréhension des phénomènes physiques qui régissent le fonctionnement des transistors. La réduction des dimensions impose aujourd'hui d'adapter les méthodes d'extraction préexistantes aux nouvelles générations de dispositifs. Ainsi, nous montrons comment – à partir de courbe courant-tension ID(VG) et capacité-tension Cgc(VG) – il est possible d'extraire avec précision la mobilité à bas champ (μ0) et les résistances séries (RSD) sur des transistors ultra-courts