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Mostrando ítems 161-170 de 1126
Captação de recursos financeiros privados por empresas nascentes de base tecnológica: estudo de múltiplos casos de empresas mineiras e paulistas
(Universidade Federal de Minas GeraisUFMG, 2011-05-04)
The international literature has highlighted the importance of technological entrepreneurship. In this issue, is highlighted the emergence of New Technology-Based Firms (NTBFs) that commercialize new products and new ...
Estados ligados e supercondutividade não convencional em sistemas com impurezas
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE FÍSICAPrograma de Pós-Graduação em FísicaUFMG, 2021-03-30)
In this thesis we carry out a theoretical investigation on the effect of impurities in many body systems. In the first part of this work we study the behavior of a mobile impurity in a 2D topological semimetal with quadratic ...
Empreendedorismo tecnológico: processo de geração de startups (p-start) e métodos de suporte ao reconhecimento, criação e exploração de oportunidades
(Universidade Federal de Minas GeraisUFMG, 2018-01-30)
Technology entrepreneurship (TE) has gaining increasing importance over the last decades. Therefore, a multidisciplinary research field was formed around research on technology-based innovation and entrepreneurship. However, ...
Desenvolvimento e estudo de sondas para microscopia óptica de campo próximo
(Universidade Federal de Minas GeraisUFMG, 2015-11-16)
This thesis reports the usage of electron microscopy on the study and development of probes for scanning near-field optical microscopy (SNOM). Two fabrication methods for the production of sharp SNOM probes are described: ...
Estudo de solos antropogênicos da Amazônia utilizando a espectroscopia Raman
(Universidade Federal de Minas GeraisUFMG, 2011-03-10)
The Terras Pretas de Índios da Amazônia are very productive soils found in northern Brazil. These soils are fleeing from the reality of tropical regions, deeply affected by heavy rains and high temperatures. Studies have ...
Study of electrostatic shielding and environmental interactions in carbon nanotubes by Resonance Raman Spectroscopy
(Universidade Federal de Minas GeraisUFMG, 2010-08-30)
In the last decade, many theoretical and experimental achievements have been made in the photophysics of single wall carbon nanotubes (SWNTs). Such accomplishments allowed us to gain a deep understanding of the physics ...
Mapeamento da constante dielétrica local de um sistema biológico nanoestruturado: estudo da asa da libélula Chalcopterix rutilans
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE FÍSICAPrograma de Pós-Graduação em FísicaUFMG, 2021-03-18)
The aim of this work is to determine the dielectric constant value of a bio-nanostructured system via Electrostatic Force Microscopy (EFM) and to show how this method is useful to study natural photonic crystals. We mapped ...
Efeitos da desordem e segregação nas propriedades eletrônicas de camadas de carbonitreto de boro
(Universidade Federal de Minas GeraisUFMG, 2007-03-14)
Materials with sp2 covalent bonds can present distinct electronic structures. For instance, a graphite sheet (graphene) is a conductor while an analogous boron nitride sheet, h - BN, is a wide gap insulator. The complete ...
Estudo dos pares de Cooper fotônicos e sua relação com os formalismos da teoria BCS da supercondutividade e da teoria da superfluidez
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE FÍSICAPrograma de Pós-Graduação em FísicaUFMG, 2022-02-22)
The correlated Stokes-anti-Stokes (SaS) Raman scattering occurs with the creation of a Stokes (S) and anti-Stokes (aS) photon pair where the phonon created by the S process is annihilated by the aS process. This process ...
O espalhamento Raman correlacionado Stokes-anti-Stokes: um estudo da influência da largura temporal do pulso de excitação
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE FÍSICAPrograma de Pós-Graduação em FísicaUFMG, 2022-10-21)
In this work, we study the correlated Stokes-anti-Stokes (SaS) Raman scattering in a diamond sample and the influence that the excitation pulse width has in the intensity of generation of the correlated pairs in the process. ...