Détection électromagnétique d'éléments polluants au dessus de la surface maritime

Ce document présente les travaux réalisés dans le cadre de la thèse de Mohamed Yassine Ayari entre octobre 2002 et novembre 2005. Les travaux ont été effectués au sein du laboratoire E3I2-EA3876 de l ENSIETA à Brest. Le projet de thèse a pour objectif global la fourniture de moyens méthodologiques permettant de détecter les polluants à la surface de la mer (pétrole, résidus pétrochimiques, ) par des méthodes électromagnétiques (radar). L une des difficultés supplémentaires au problème posé concerne la configuration adoptée, il s agit de la configuration bistatique ou l émetteur et le récepteur sont séparés (contrairement au cas souvent utilisé, rétrodiffusion ou propagation avant). Jusqu à présent, peu d études se sont intéressées à la détection électromagnétique des polluants de surface et moins aux problèmes de diffusion par les surfaces rugueuses en configuration bistatique. La plupart des méthodes de détection actuelles sont basées soit sur la technique d imagerie par satellites, soit sur des images radar ( SAR, ) Ces derniers sont difficilement exploitables et ne donnent pas une idée précise quant à la nature de polluant. En effet, l imagerie SAR donne des effets similaires pour une surface couverte du polluant et une autre abritée du vent. Au cours de notre travail, nous avons étudié l effet du polluant sur les caractéristiques physiques et géométriques de la surface de la mer et corrélé cette étude avec les modèles de diffusion électromagnétique afin d avoir une idée précise sur l effet du polluant sur la diffusion électromagnétique par la surface pour différentes configurations et différentes polarisations à l émission et à la réceptionThis document presents the work completed within the theis of Mohamed Yassine Ayari between october 2002 and novembre 2005. The work was carried out in the laboratory E3I2-EA 3876 of ENSIETA in Brest. The project of the thesis has the objective to supply methodological means on making it possible to detect the pollutants on the surface of the sea (oil, residues petrochemical ) by electromagnetic methods (radar). One of the additional difficulties to the problem arising relates to the adopted configuration, it acts of the bistatic configuration where the transmitter and the receiver are separate (contrary to the case often used : backscattering configurtion). Until now, few studies were interested in electromagnetic detection of pollutants on sea surface and less in the scattering problems by rough surfaces in bistatic configuration. The majority of the current detection methods are based either on the technique of satellite photos or on radar imagery (SAR ). The latter are not easily exploitable and do not give a precise idea as for the nature of pollutant. Indeed, SAR images give similar effects for a covered surface with pollutants and another sheltered wind surface. During this work we have studied the effect of the pollutant on physical and geometrical sea surface characteristics and correlated this study with the electromagnetic scattering models in order to have a precise idea on the effect of the pollutant on the electromagnetic surface scattering for different configurations and various transmitter and the receiver polarizations.BREST-BU Droit-Sciences-Sports (290192103) / SudocPLOUZANE-Bibl.La Pérouse (290195209) / SudocSudocFranceF

About a case of paratesticular myxoid liposarcoma

Paratesticular liposarcomas are relatively common sarcomas in the paratesticular region, however, the myxoid variant is considered very rare. Due to the infrequency of this malignant disease, no standard treatment would be available. Multiple treatments have reported in literature with different results. Herein, we presented a case of paratesticular myxoid liposarcoma in a 67-year-old man originating from the right paratesticular soft tissue. Keywords: Myxoid liposarcoma, Paratesticular, Scrotal mas

Renal malakoplakia mimicking a locally advanced renal mass: A case report

Malakoplakia is a rare inflammatory condition that can affect many organ systems, including genitourinary tract, it is associated with impaired immune function. It is characterized by distinctive Michaelis-Gutmann bodies. Very rare cases have been reported to present as a locally advanced renal mass

Clear Cell Adenocarcinoma of the Female Urethra, Mimicking Cystocele

Clear cell adenocarcinoma of the urethra is an extremely rare neoplasm mainly described in women. Anterior pelvic exenteration was the treatment performed in most reported cases. It seems to have poorer prognosis than urothelial carcinomas

Epidemiology of heart failure and long-term follow-up outcomes in a north-African population: Results from the NAtional TUnisian REgistry of Heart Failure (NATURE-HF)

International audienceThe NATURE-HF registry was aimed to describe clinical epidemiology and 1-year outcomes of outpatients and inpatients with heart failure (HF). This is a prospective, multicenter, observational survey conducted in Tunisian Cardiology centers. A total of 2040 patients were included in the study. Of these, 1632 (80%) were outpatients with chronic HF (CHF). The mean hospital stay was 8.7 ± 8.2 days. The mortality rate during the initial hospitalization event for AHF was 7.4%. The all-cause 1-year mortality rate was 22.8% among AHF patients and 10.6% among CHF patients. Among CHF patients, the older age, diabetes, anemia, reduced EF, ischemic etiology, residual congestion and the absence of ACEI/ ARBs treatment were independent predictors of 1-year cumulative rates of rehospitalization and mortality. The female sex and the functional status were independent predictors of 1-year all-cause mortality and rehospitalization in AHF patients. This study confirmed that acute HF is still associated with a poor prognosis, while the mid-term outcomes in patients with chronic HF seems to be improved. Some differences across countries may be due to different clinical characteristics and differences in healthcare systems