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Functionalization of cork agglomerate composite with pcm microcapsules after db...
Carmo, S. N.; Oliveira, F. R.; Silva, E. A. A.; Steffens, F.; Souto, A. PedroThis research intends to study the influence of dielectric barrier discharge (DBD) plasma treatment on the adsorption of Phase Change Materials (PCM) microcapsules applied to cork agglomerate laminated with a polymer membrane. Several experimental techniques were used to evaluate cork and membrane surface modification after plasma treatment and the influence on the microcapsules adsorption, namely, Static and D...
Characterization of natural cork agglomerate functionalised by plasma treatment
Silva, E. A. A.; Oliveira, F. R.; Carmo, S. N.; Steffens, F.; Souto, A. PedroThis work intends to study the chemical and physical modifications of natural cork agglomerate after plasma treatment using dielectric barrier discharge (DBD). Different experimental techniques were used to evaluate the surface alterations of the substrate pre- treated with DBD plasma, namely, static and dynamic contact angle, surface energy, Fourier transform infrared spectroscopy (FTIR), energy dispersive spe...
Cortiça, tecnologia e moda : aplicação da descarga plasmática para viabilizar a...
Etienne, E. A. A.; Oliveira, F. R.; Carmo, S. N.; Steffens, F.; Souto, A. PedroEste trabalho pretende estudar potenciais aplicações da cortiça. Por ser tratar de um material inerte, muitas vezes torna-se necessário modificar a superfície deste substrato com o intuito de melhorar a sua interação com outros tipos de materiais nos processos de estamparia, tingimento, acabamentos entre outros. Diferentes técnicas foram utilizadas para analisar a cortiça após o tratamento plasmático. Verificou...
Contribution from Drell-Yan processes to the emission spectrum in solar flares
Szpigel,S.; Durães,F. O.; Steffens,F. M.The recent discovery of a new and intense solar flare radiation spectral component with a maximum in the terahertz range has raised a great deal of interest. The origin of this component is still unknown, constituting a problem that goes beyond the application of canonical models used to describe the well-known microwave spectrum. In this work, we present preliminary results on the investigation of a possible c...
The temperature dependence of the QCD running coupling
Steffens,F. M.We study the running of the QCD coupling with the momentum squared (Q²) and the temperature scales in the high temperature limit (T > Tc), using a mass dependent renormalization scheme to build the Renormalization Group Equations. The approach used guaranty gauge invariance, through the use of the Hard Thermal Loop approximation, and independence of the vertex chosen to renormalize the coupling. In general, the...
The flavor asymmetry in the polarized proton sea
Steffens,F. M.We perform a careful study on the effect of the Pauli blocking to the light polarized antiquark structure of the proton sea. We develop the formal expressions for the polarized antiquark distributions, highlighting the role played by quark statistics and the vacuum structure. The ratio involving the polarized antiquarks is calculated. In particular, it is found that D<img id="_x0000_i1026" src="../../../../img/...
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