Dissertação de mestrado em Redes e Serviços de Comunicações ; Nos últimos anos, têm surgido várias soluções que visam alcançar configurações eficientes para o encaminhamento de tráfego OSPF (Open Shortest Path First). Este trabalho tem por intento a prossecução da investigação nessa área, com o objetivo de alcançar mecanismos de otimização eficientes que sejam resilientes a mudanças relevantes no ambiente de u...
The optical conductivity of graphene nanoribbons is analytical and exactly derived. It is shown that the absence of translational invariance along the transverse direction allows considerable intraband absorption in a narrow frequency window that varies with the ribbon width, and lies in the THz range domain for ribbons 10–100 nm wide. In this spectral region the absorption anisotropy can be as high as two orde...
We consider the electronic structure near vacancies in the half-filled honeycomb lattice. It is shown that vacancies induce the formation of localized states. When particle-hole symmetry is broken, localized states become resonances close to the Fermi level. We also study the problem of a finite density of vacancies, obtaining the electronic density of states, and discussing the issue of electronic localization...
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