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L'approche de la theorie de la fonctionnelle de la densite (DFT) est utilisee pour etudier les proprietes electroniques de nanograins de silicium incorpores dans une matrice de silice SiO2 dopee ou non avec de l'erbium. D'abord, nous nous sommes interesses au materiau constitue de nanograins de silicium immerges dans differentes formes cristallines de SiO2. Nous avons construit plusieurs modeles (supercellules cubiques de taille differentes contenant un grain de silicium dont la taille est egalement variable). Nous avons ainsi etudie l'influence de plusieurs parametres sur les proprietes...

The book deals with the origins of Vietnam, especially the Dongsonian civilization with its characteristic bronze drums. The year was 39 CE when the Lac people under the Trung's leadership revolted against the Chinese yoke and threw them out of Vietnam. The Trung Sisters reigned for almost three years when they had to face a new Chinese army sent to subdue them. The Trung Sisters were the first warriors and Queens to define the identity of the unique Vietnamese culture. They instilled and sowed the concepts of freedom and independence, seeds that took a long time to blossom. They showed the...