Encontrados 35 documentos, a visualizar página 1 de 4
Ag+ release and corrosion behavior of zirconium carbonitride coatings with silv...
Calderon Velasquez, S.; Galindo, R. Escobar; Oliveira, J. C.; Cavaleiro, A.; Carvalho, S.Zirconium carbonitride coatings with silver nanoparticles were produced by DC unbalanced dual magnetron sputtering system, using two targets, Zr and Zr/Ag in an Ar, C2H2 and N2 atmosphere. Stainless steel 316L and silicon (100) substrates were used for electrochemical and structural characterization, respectively. Silver was found to be well distributed throughout the coatings, maintaining the films' compositio...
Influence of surface features on the adhesion of Staphylococcus epidermidis to ...
Carvalho, I.; Henriques, Mariana; Oliveira, J. C.; Alves, C. F.; Piedade, Ana Paula; Carvalho, S.Staphylococcus epidermidis has emerged as one of the major nosocomial pathogens associated with infections of implanted medical devices. The initial adhesion of these organisms to the surface of biomaterials is assumed to be an important stage in their colonization. The main objective of this work is to assess the influence of surface features on the adhesion of S. epidermidis to Ag–TiCN coatings deposited by d...
Synthesis and thermal behavior of La9.33Si2Ge4O26 apatite for SOFCs
Serra, R.; Alves, Cátia; Oliveira, J.C.; Oliveira, F. A. Costa; Marcelo, Teresa; Mascarenhas, João; Trindade, B.Powders of La2O3, GeO2 and SiO2 were dry milled in a planetary ball mill with different rotation speeds (150–350 rpm) and increasing milling times up to 35 h in order to obtain the La9.33Si2Ge4O26 apatite phase at room temperature. The results showed that the higher the rotation speed the lower the time required for the formation of the apatite phase. No reaction between the starting powders was observed at 150...
Effects of O addition on the thermal behaviour of hard W-N sputtered coatings
Louro, C.; Oliveira, J. C.; Cavaleiro, A.The structural thermal behaviour of three W-O-N sputtered coatings with similar metalloid to metal ratio (~2.1) was investigated up to 900 °C after annealing in a vacuum tube furnace as well as in-situ HT-XRD under a controlled atmosphere of Ar-5%H2. The as-deposited microstructure of the coatings consisting in a nanocomposite of low-order W-O and W-N phases evaluated differently as a function of the oxygen con...
Oxidation of magnetron sputtered La-Si thin films for solide oxide fuel cell el...
Oliveira, J. C.; Horwat, D.; Billard, A.; Cavaleiro, A.http://www.sciencedirect.com/science/article/B6TW0-4TN82DN-4/2/d9656db8902a2eb13310e9dca5201287
Modulated Chaos as a Source of Images for Numbers
Tiago de Oliveira, J- C.Classificação de imagens de Markus-Lyapounoff
Development of new decorative coatings based on gold nanoparticles dispersed in...
Torrell, M.; Machado, P.; Cunha, L.; Figueiredo, N. M.; Oliveira, J. C.; Louro, C.; Vaz, F.The present work is devoted to the optical properties of Au:TiO2 thin films in order to clarify the role of the Au clusters inclusions in the TiO2 dielectric matrix. Three series of films containing about 30 at.% (29.2), 20 at. % (19.8) and 10 at.% (9.3) Au were deposited by dc reactive magnetron sputtering. On thermal annealing in the range from 300 to 800 °C in protective atmosphere, significant changes on th...
Characterization of patterns of food packaging usage in portuguese homes
Poças, M. F. F.; Oliveira, J. C.; Pinto, H. J.; Zacarias, M. E.; Hogg, T.This study aimed to further refine the exposure assessment of migrants from food-contact materials by characterizing, at the household level, food packaging usage (amount and type) in Portuguese urban families. Packages from domestic use were collected from a sample of 105 consumers from 34 households over a 30-day period. Collected packages (more than 6000 items) were characterized in the laboratory and data w...
Fragments Intimes d'un Savant Oublié
Tiago de Oliveira, J. C.Explicação do "ser matemático não arbitrário" Posições sobre a história dos povos semitas. Atitude perante a história da arte. Poema de amor à Esposa.
Obesidade Infantil, Actividade Física e Sedentarismo em crianças do 1ºciclo do ...
Campos, L. F.; Gomes, J. M.; Oliveira, J. C.During last years we’ve been assisting to a significant increase on the indexes of prevalence of childhood obesity, particularly in developed countries, conducting, in some cases, to epidemic proportions. Concerning this fact, the term “Disease of Civilization” associated to Obesity is clearly indicative of a dramatic situation. With the aim of searching the occurrence of obesity and over-weight in children in ...
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