Les importations méditerranéennes en Gaule du Centre-Ouest et dans les pays de la Loire moyenne du VIIe siècle au IIIe siècle a.C. Un bilan.

In : Krausz S., Colin A., Gruel K., Ralston I., Dechezleprêtre T., L'Âge du Fer en Europe. Mélanges offerts à Olivier Buchsenschutz, Bordeaux, AusoniusAn inventar of greeck, etruscian & iberic imports in western Gaul durant Hallstatt & early La Tène periodsBilan des connaissances sur les importations grecques, étrusques et ibériques en Gaule de l'Ouest pendant le premier âge du Fer et le début du secon

Prospects for Type Ia Supernova explosion mechanism identification with gamma rays

The explosion mechanism associated with thermonuclear supernovae (SNIa) is still a matter of debate. There is a wide agreement that high amounts of of radioactive nuclei are produced during these events and they are expected to be strong gamma-ray emitters. In the past, several authors have investigated the use of this gamma-ray emission as a diagnostic tool. In this paper we have done a complete study of the gamma-ray spectra associated with all the different scenarios currently proposed. This includes detonation, delayed detonation, deflagration and the off-center detonation. We have performed accurate simulations for this complete set of models in order to determine the most promising spectral features that could be used to discriminate among the different models. Our study is not limited to qualitative arguments. Instead, we have quantified the differences among the spectra and established distance limits for their detection. The calculations have been performed considering the best current response estimations of the SPI and IBIS instruments aboard INTEGRAL in such a way that our results can be used as a guideline to evaluate the capabilities of INTEGRAL in the study of type Ia supernovae. For the purpose of completeness we have also investigated the nuclear excitation and spallation reactions as a possible secondary source of gamma-rays present in some supernova scenarios. We conclude that this mechanism can be neglected due to its small contribution.Comment: 10 pages, 12 figures, LaTeX with MNRAS style file,accepted for publication in The Monthly Notices of the Royal Astron.So

Nonparametric causal discovery with applications to cancer bioinformatics

Many natural phenomena are intrinsically causal. The discovery of the cause-effect relationships implicit in these processes can help us to understand and describe them more effectively, which boils down to causal discovery about the data and variables that describe them. However, causal discovery is not an easy task. Current methods for this are extremely complex and costly, and their usefulness is strongly compromised in contexts with large amounts of data or where the nature of the variables involved is unknown. As an alternative, this paper presents an original methodology for causal discovery, built on essential aspects of the main theories of causality, in particular probabilistic causality, with many meeting points with the inferential approach of regularity theories and others. Based on this methodology, a non-parametric algorithm is developed for the discovery of causal relationships between binary variables associated to data sets, and the modeling in graphs of the causal networks they describe. This algorithm is applied to gene expression data sets in normal and cancerous prostate tissues, with the aim of discovering cause-effect relationships between gene dysregulations leading to carcinogenesis. The gene characterizations constructed from the causal relationships discovered are compared with another study based on principal component analysis (PCA) on the same data, with satisfactory results.Comment: Diploma Thesis in Computer Science. In spanish. Supervised by Drs Gabriel Gil and Augusto Gonzalez. 74 pages, 11 figures, 12 table

Un nouveau regard sur la fibule à plaquettes de La Tène moyenne de la Fond des Berthons à Naintré (Vienne) : un décor de corail

Coral identification in place of ivory. Observations about use of coral during Middle La Tène period.Identification de corail en lieu d'ivoire. Remarques sur l'utilisation du corail pendant La Tène moyenn

Diagnostic procedures and long-term prognosis in bilateral renal cortical necrosis

Diagnostic procedures and long-term prognosis in bilateral renal cortical necrosis. Thirty-eight patients with bilateral renal cortical necrosis (BRCN) were studied with special reference to etiology, diagnostic procedures and ultimate prognosis. BRCN was of obstetrical origin in 26 patients and more frequent during the third trimester of pregnancy (21%) than earlier (1.5%). Renal biopsy, renal arteriography and hemodynamic data were useful procedures in the early differentiation of total from patchy BRCN. In patients with patchy BRCN, the percentage of destroyed glomeruli on the kidney biopsy specimen was lower than in those with total BRCN, renal arteriography showed that the cortical nephrogram was present but non-homogeneous and mean renal blood flow (MRBF) (85Kr method) fell within the range observed in patients with acute tubular nephropathy undergoing full recovery. In patients with total BRCN, cortical tissue was uniformly necrotic, the cortical nephrogram was completely absent, MRBF was always below 50 ml/100 g·min and a first component was never recognizable. Biological evidence of intravascular coagulation was inconstant. Intrarenal vascular thrombi were only found in the renal biopsy specimens of those patients with short survival. Partial recovery occurred in 16 patients and GFR increased over a one year period. Subsequent deterioration of renal function occurred in nine patients requiring chronic hemodialysis and/or renal transplantation.Diagnostic et pronostic lointain des nécroses corticales bilatérales des reins. Trente-huit malades atteints de nécrose corticale bilatérale des reins (NCR) ont été spécialement étudiés du point de vue de l'étiologie, des méthodes de diagnostic et du pronostic lointain. La NCR a été d'origine obstétricale chez 26 malades et a été plus souvent observée pendant le troisième trimestre de la grossesse (21%) que plus précocement (1, 5%). La biopsie rénale, l'artériographie rénale et les données hémodynamiques ont été utiles pour distinguer les NCR totales et partielles. Chez les malades atteints de NCR partielle, la biopsie rénale a montré que le pourcentage de glomérules détruits était plus bas que dans les NCR totales, l'artériographie rénale a montré que la néphrographie corticale était présente mais non-homogène et le flux sanguin rénal moyen (FSRM) (méthode au 85Kr) restait compris dans les limites observées chez les malades atteints de néphropathie tubulaire aiguë avec guérison complète. Chez les malades atteints de NCR totale, le tissu rénal cortical était uniformément nécrotique, la néphrographie corticale totalement absente, le FSRM était toujours inférieur à 50 ml/100 g·mn et aucun premier composant n'était individualisable. Les preuves biologiques d'une coagulation intravasculaire ont été inconstantes. Des thrombi vasculaires intrarénaux n'ont été rencontrés en biopsie que chez les malades ayant une courte survie. Une récupération partielle a été observée chez 16 malades et la FG a continué à s'élever au-delà de la première année. Une aggravation secondaire de la fonction rénale est survenue chez neuf malades, nécessit ant des hémodialyses périodiques et/ou une transplantation rénale

Robust Stabilization of Neutral Systems with Saturating Inputs

International audienceThis paper focuses on the stabilization problem of neutral systems in the presence of control saturation. Based on a descriptor approach and the use of a modified sector condition, global and local stabilization conditions are derived using Lyapunov-Krasovskii functionals. These conditions allow to consider systems presenting time-varying delays and are formulated directly as linear matrix inequalities (LMIs). Optimization problems are formulated with the aim of computing stabilizing state feedback control laws

Stèles et statues du premier âge du Fer et de La Tène ancienne, de l'Aquitaine au Berry. De la Méditerranée et du Westhallstattkreis à la Gaule de l'Ouest et du Centre.

International audienceLate Bronze Age to Early La Tène period steles from Loire to AquitaniaStèles du Bronze final à La Tène ancienne de la Loire à l'Aquitain