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Search Results: 1 - 10 of 1304 matches for " Damien Simonin "
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Pouvoir et sexualité. Le discours féministe sur la prostitution en France (1968-1986).
Damien Simonin
Genre & Histoire , 2010,
Abstract: Cette recherche porte sur les discours sur la prostitution dans la presse féministe, entre 1968 et 1986 en France. Durant cette période, le mouvement féministe est composé de courants conflictuels (courants réformistes et révolutionnaires, différentialistes et universalistes) et il porte des discours hétérogènes (informations sur la prostitution, analyses théoriques et politiques, témoignages de prostituées). Pourtant, ces discours s'accordent sur la revendication d'une libération des rapport...
Two-Impurity Anderson-Kondo Model: first order Impurity-correlation
J. Simonin
Physics , 2005,
Abstract: We analyze the consequences of a first-order (in the effective Kondo coupling) inter-impurity correlation present in the Two-Impurity Anderson Hamiltonian. This correlation generates a pair of Kondo Doublet states which are responsible for the first (higher energy) Kondo stage of these systems. Applied to systems of quantum dots in a semiconductor heterolayer, these Doublets predict a mainly ferromagnetic dot-dot spin correlation which is different than the expected from the second-order RKKY interaction. In order to effectively screen both dots, a parallel alignment of the dot-spins is favored by the interaction.
Looking for the Kondo cloud
Jorge Simonin
Physics , 2007,
Abstract: We study the spatial distribution of the Kondo screening cloud. We find that in 3 D the spatial range of the cloud is limited to distances of the order of the Fermi wavelength due to angular dispersion effects. In lower dimensions this effect is less important and thus the Kondo length determines the localization of the cloud around the magnetic impurity. We clarify the role of the Kondo cloud in the impurity-impurity interactions: the hole coherence factor of the Kondo-doublet interaction is proportional to the amplitude of the Kondo cloud. We single out an experimental setup in which the Kondo cloud could be directly measured.
Two Impurity Anderson problem: Perturbative Kondo-Doublet interaction
J. Simonin
Physics , 2008,
Abstract: We reobtain the Kondo-Doublet interaction by means of the Brillouin-Wigner Perturbation theory. By applying the same method to the single impurity case we show that the Kondo-Doublet interaction is a direct consequence of the Kondo screening cloud. We fully confirm our previous results on this novel interaction. In particular, we found that for values of the system parameters typical of semiconductor Quantum Dots heterostructures, the ferromagnetic Kondo-Doublet interaction dominates over the RKKY one.
Kondo Quantum Dots and the Novel Kondo-doublet interaction
J. Simonin
Physics , 2006, DOI: 10.1103/PhysRevLett.97.266804
Abstract: We analyze the interactions between two Kondo Quantum Dots connected to a Rashba-active Quantum Wire. We find that the Kondo-doublet interaction, at an inter-dot distance of the order of the wire Fermi length, is over an order of magnitude greater than the RKKY interaction. The effects induced on the Kondo-doublet interaction by the wire spin-orbit coupling can be used to control the Quantum Dots spin-spin correlation. These results imply that the widely used assumption that the RKKY is the dominant interaction between Anderson impurities must be revised.
Two Anderson Impurity problem: Kondo-doublets beyond the Kondo Limit
J. Simonin
Physics , 2007,
Abstract: We analyze the effects of high energy configurations on the Kondo-doublet interaction between two Anderson impurities. We found that the Kondo doublet states are robust and that their coherence energy is incremented by the inclusion of high energy configurations. Analytic expressions are obtained for the corrections near the Kondo limit. Analysis of the system in the intermediate valence regime shows that the behavior of the system can be changed from ferromagnetic to sligthy antiferromagnetic by tuning the system parameters; this regime can also be used to study the interplay between hole-driven and electron-driven coherence effects.
Two Anderson Impurities in the Kondo Limit, Doublet States
J. Simonin
Physics , 2005,
Abstract: We analyze two pairs of doublet states for the two Anderson impurity problem. We found that for short interimpurity distances they have a lower energy than the ferro triplet and the antiferro singlet. For medium to long distances between the impurities, the doublets also have a lower energy than the two decoupled Kondo-singlet state for most of the range of interest. The mechanism behind their energy gain is an coherence enhanced Kondo-like interaction.
Two Anderson Impurities in the Kondo Limit. Systematic Study
J. Simonin
Physics , 2005,
Abstract: We analyze the two Anderson impurity problem, in the strong Coulomb repulsion limit, by means of variational wave functions whose equations we solve analytically. We found two pairs of Doublet states, one odd and one even with respect to the midplane between the impurities. These Doublets make a significatively strong use of the hybridization terms of the Hamiltonian, and have a much larger Kondo-like correlation energy than a single impurity (the Kondo energy). Furthermore, these Doublets combine to form a Super-Singlet. This Super-Singlet makes use of the remaining hybridization probability to improve its energy with respect to the Doublets energy, but for low-Dimensional systems and at the inter-impurity distances where the Doublets are full developed, its energy gain is exponentially small. The interaction behind the Doublets is a first-order (in the effective Kondo coupling) one, it also generates a parallel alignment of the impurity-spins. This ferromagnetic impurity-impurity response is thus generated without resort to the RKKY interaction. The effective range of this first-order Doublet interaction is also much larger than the one of the RKKY interaction.
Les monts d'Ougarta d'après SPOT 1
Mappemonde , 1988,
Abstract: D'après une image SPOT, un exemple de cartographie géomorphologique en zone aride (Sahara algérien).
Lymphotoxin Signaling Is Initiated by the Viral Polymerase in HCV-linked Tumorigenesis
Yannick Simonin ,Serena Vegna,Leila Akkari,Damien Grégoire,Etienne Antoine,Jacques Piette,Nicolas Floc'h,Patrice Lassus,Guann-Yi Yu,Arielle R. Rosenberg,Michael Karin,David Durantel,Urszula Hibner
PLOS Pathogens , 2013, DOI: 10.1371/journal.ppat.1003234
Abstract: Exposure to hepatitis C virus (HCV) typically results in chronic infection that leads to progressive liver disease ranging from mild inflammation to severe fibrosis and cirrhosis as well as primary liver cancer. HCV triggers innate immune signaling within the infected hepatocyte, a first step in mounting of the adaptive response against HCV infection. Persistent inflammation is strongly associated with liver tumorigenesis. The goal of our work was to investigate the initiation of the inflammatory processes triggered by HCV viral proteins in their host cell and their possible link with HCV-related liver cancer. We report a dramatic upregulation of the lymphotoxin signaling pathway and more specifically of lymphotoxin-β in tumors of the FL-N/35 HCV-transgenic mice. Lymphotoxin expression is accompanied by activation of NF-κB, neosynthesis of chemokines and intra-tumoral recruitment of mononuclear cells. Spectacularly, IKKβ inactivation in FL-N/35 mice drastically reduces tumor incidence. Activation of lymphotoxin-β pathway can be reproduced in several cellular models, including the full length replicon and HCV-infected primary human hepatocytes. We have identified NS5B, the HCV RNA dependent RNA polymerase, as the viral protein responsible for this phenotype and shown that pharmacological inhibition of its activity alleviates activation of the pro-inflammatory pathway. These results open new perspectives in understanding the inflammatory mechanisms linked to HCV infection and tumorigenesis.
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