Conception et fabrication de circuits intégrés monologhiques microondes pour radiocommunictions

La technologie des MMICS -- Regard historique des MMICs -- Les technologies des MMIC -- Comparaison entre les MMICs et les MHMICs -- Les applications -- Procédés de fabrication des MMICS -- La technologie AsGa du CMC -- Exemple d'éléments planaires -- Instrumentation pour MMIC et mesure de circuits actifs -- Instrumentation -- Station de mesures sous pointes -- Station de mesure sous-pointes du laboratoire -- Calibration -- Mesures de résistances -- Design et caractérisation de circuits passifs -- Lignes microrubans -- Lignes coplanaires -- Généralités sur les coupleurs directionnels et les jonctions hybrides -- Coupleur hybride -- Coupleurs directionnels à ligne CPW couplées -- Coupleur "multioctave" -- Validation des règles du procédé de Nortel dans le Design d'un amplificateur -- Généralités sur la conception des amplificateurs -- Choix des paramètres du transistor -- Unilatéralité -- Stabilité -- Adaptation du transistor -- Mesures -- Interprétation des résultats de mesure

PETROGRAPHIE DU GISEMENT D’OR DE BONIKRO, SILLON BIRIMIEN D’OUME - FETTEKRO, COTE D’IVOIRE

The Bonikro gold deposit is located in the southern part of the Oumé- Fettèkro birimian furrow. Its lithology is made of two primary rocks units; a mafic volcanic sequence in the East and a unit of volcano-sedimentary rocks in the western part. The interface of these two units is occupied by the Bonikro Shear Zone and the granodiorit. This intrusive is associated with the dykes of pegmatite and aplite, but also with volcanic giving the group of felsic rocks in the deposit. The minerals of sericite, chlorite, epidote observed in these rocks are consistent with the impacts of the greenschist facies metamorphism. Also, these lithologies are affected by a strong hydrothermal alteration due to the abundant veins of quartz, carbonate, albite, sulphide, scheelite and gold. The distribution of these aforenamed two units in the east and in the west supports the fact that the birimian has inherited the ancient valley. The various volcanic rocks are linked to the birimian volcanism, when the pyroclastites imply that this volcanism has undergone a possible period of explosive character

Petrographie Des Volcanites Et Plutonites De La Partie Sud Du Sillon Volcano-Sedimentaire De Toumodi-Fetekro (Cote D’ivoire)

The southern part of Toumodi-Fètêkro greenstone belt is located in the Center - Southeast of Ivory Coast. Petrographic study of volcanic and plutonic rocks shows three units. The first unit is composed of basaltic to rhyolitic lavas which imply effusive character. Then we have volcanosedimentary unit composed of pyroclastic formations (lapilli tuff, breccia, ash deposit and ignimbrites) and the pillow-lavas. Indeed, the presence of this last shows clearly that an explosive volcanism and a submarine effusive volcanism have occurred during during the setting of Toumodi-Fètêkro belt. Plutonic unit is constituted of gabbroic to granitic rocks. Sericite, chlorite, epidote observed in these rocks are consistent with the impacts of greenschist facies metamorphism. The rocks of the southern part of the Toumodi-Fètêkro greenstone belt are formed in a subduction context rather than in oceanic plateaus context because of the old inheritance, sometimes of Archean age, found somewhere in theBirimiandomain. The lithologies of the southern part of Toumodi-Fètêkro meet elsewhere in the other Birimian greenstone belts. Also, these lithologies are affected by a hydrothermal alteration due to the abundant veins of quartz, carbonates, sericite, chlorite, epidote, sulphides and oxides. However, volcanic show in some places amphibolit facies metamorphism