Física: Últimas Submissões
Resultados 61-70 de 830
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Wetting phenomena : from basic science to applications
(2021) [Tese]The study of wetting phenomena in solids is of great interest due to the multifaceted technological applications of hydrophobic, hydrophilic and oleophobic surfaces. Examples of such applications include self cleaning ... -
Revealing the chemical evolution history of the Milky Way halo with RR Lyrae stars
(2021) [Tese]The Galactic Halo is the component of the Milky Way that can preserve the clearest signatures of the accretion of satellites required for the built-up of the Galaxy according to the Λ cold dark matter paradigm. The nature ... -
Transições de fases em sistemas magnéticos com frustração e desordem em grafos aleatórios
(2021) [Tese]Nesta tese, estudamos sistemas magnéticos com frustração e desordem em redes com conectividade finita. Especificamente, nos concentramos em grafos aleatórios, onde a existência de uma conexão entre dois sítios da rede é ... -
Testing general relativity at galactic scales
(2021) [Dissertação]General Relativity (GR) has been successfully tested in Solar system scales. However, for galactic scales, this theory has been poorly tested. Moreover, several galaxy data analysis depend on the value of the Hubble constant ... -
Asteroseismology of massive ZZ Ceti stars : an updated grid of fully evolutionary models
(2021) [Dissertação]White dwarfs stars are by far the most common outcome of stellar evolution, being the final product of more than 95% of all stars in the Milk Way. During their evolution, the white dwarf stars cross several zones known as ... -
The impact of axion emission on the cooling of white dwarf stars
(2021) [Dissertação]Axions are theoretical particles that have been probed in stellar systems such as white dwarf stars, which have already been shown to be excellent laboratories for the study of axions with coupling to electrons. However, ... -
Design of integrable quantum devices
(2021) [Dissertação]We present an integrable four-well model that describes the interaction and quantum tunneling of bosons in a square plaquette. This model possesses four conserved and independent quantities, of which two can be employed ... -
Anel de partículas ativas : emergencia da coletividade, difusão e morfologia
(2021) [Dissertação]Sistemas ativos são formados por entidades autônomas que absorvem individualmente energia (nutrientes, alimento) do meio para posteriormente convertê-la em energia cinética e moverem-se com movimento persistente (autopropulsão). ... -
Improving the photodegradation of dyes with SrTiO3-modified nanoparticles
(2021) [Dissertação]Nowadays, thousands of tons of dyes are produced worldwide annually by the industry, and almost one-third of these substances is thrown into effluents. Methylene blue is a widely used dye. Thus, there is a strong need to ... -
Dispositivo para análise e caracterização de materiais semicondutores utilizados como sensores de gás
(2021) [Dissertação]O trabalho apresentado nessa dissertação consiste fundamentalmente no estudo (projeto), desenvolvimento e teste de um dispositivo eletrônico destinado à obtenção de parâmetros elétricos e térmicos, como resistividade ...