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Your search keyword '"Ferreira, S.C."' showing total 43 results
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43 results on '"Ferreira, S.C."'

1. The clinical diagnosis of malnutrition predicts mortality better than low muscle mass and strength in cirrhotic patients

Author

Anastácio, L.R., primary, Santos, B.C., additional, Fonseca, A.L.F., additional, Alves, B.C., additional, Saueressig, C., additional, Cunha, C.M., additional, Ferreira, L.G., additional, Oliveira, L.P.M., additional, Boulhosa, R.S.D.S.B., additional, de Jesus, R.P., additional, Ferreira, S.C., additional, Dall'Alba, V., additional, Luft, V.C., additional, Mizubuti, Y.G.G., additional, and Correia, M.I.T.D., additional

Published
2023
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24. Corrosion behaviour of aluminium syntactic functionally graded composites

Author

Ferreira, S.C., Velhinho, A., Silva, R.J.C., and Rocha, L.A.

Subjects
Corrosion and anti-corrosives -- Analysis, Composite materials -- Chemical properties, Engineering and manufacturing industries
Abstract

Byline: S.C. Ferreira, A. Velhinho, R.J.C. Silva, L.A. Rocha Syntactic Functionally Graded Metal Matrix Composites (SFGMMC) are a type of composites reinforced by microballoons exhibiting a graded reinforcement distribution. These materials constitute a promising new generation of lightweight structural materials for aerospace, marine and shielding/insulation applications. In this work, A356 alloy reinforced with silica-alumina microballoons (SiO2-Al2O3) was processed by casting techniques. The influence of the microballoon distribution gradient on the corrosion behaviour of the composite was investigated by potentiodynamic polarisation and Electrochemical Impedance Spectroscopy (EIS). Composite surfaces were analysed before and after testing by Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) to determine the influence of microstructural changes.

Published
2010

26. Climatic variables drive temporal patterns of α and β diversities of dung beetles.

Author

Ferreira, S.C., da Silva, P.G., Paladini, A., and Di Mare, R.A.

Subjects
*DUNG beetles, *BIOTIC communities, *BIODIVERSITY, *BIOLOGICAL extinction, *SPECIES diversity, *HABITAT partitioning (Ecology)
Abstract

Understanding the mechanisms underpinning spatiotemporal diversity patterns of biological communities is a major goal of ecology. We aimed to test two ecological hypotheses: (i) temporal patterns of β-diversity will mostly be driven by nestedness, with a loss of species from summer to winter, and (ii) nestedness values will correlate with climatic variables instead of turnover values, indicating either a loss of species during winter or a gain of species during summer. We sampled dung beetles using standardized sampling protocols along a year in four Atlantic forest sites: two at the northwest and two at the central region of Rio Grande do Sul state, southern Brazil. We partitioned temporal patterns of β-diversity into turnover and nestedness in order to investigate if community changes are driven by species substitution or gain/loss across time. Our results highlighted five main findings: (i) dung beetle composition varied more with sites than site geographic position; (ii) there was almost one and a half 'true' dung beetle assemblages regarding the spatial distribution of species weighed by abundance; (iii) we found a positive influence of mean temperature and a negative influence of relative humidity on both species richness and abundance; (iv) both spatial and temporal dissimilarity among sites were dominated by species replacement, while the relative importance of nestedness was higher in temporal than spatial patterns; (v) there was an effect of precipitation and relative humidity on temporal patterns of β-diversity components, but these effects were site-dependent. Contrary to our expectations, the β-diversity component of turnover dominated both spatial and temporal patterns in dung beetle dissimilarity among sites and months. Distinct climatic variables affected differently the α-diversity and β-diversity components of dung beetle assemblages. Partitioning β-diversity into temporal components is a promising approach to unveil patterns of the community dynamics and to produce insights on mechanisms underlying such patterns. [ABSTRACT FROM AUTHOR]

Published
2019
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35. 599 ALLELES AND GENOTYPES OF IL-18 AND TNF-α PROMOTER POLYMORPHISMS ARE ASSOCIATED WITH HIGHER RISKOF HEPATOCELLULAR CARCINOMA (HCC) IN BRAZILIAN POPULATION

Author

Teixeira, A.C., primary, Mendes-Júnior, C.T., additional, Souza, F.F., additional, Cantão, C.A.B., additional, Ferreira, S.C., additional, Deghaid, N.H.S., additional, Castelli, E.C., additional, Mente, E.D., additional, Sankarankutty, A.K., additional, Zucoloto, S., additional, Elias, J., additional, Muglia, V., additional, Castro-Silva, O., additional, Donadi, E.A., additional, and Martinelli, A.C., additional

Published
2010
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41. A one-dimensional model for the growth of CdTe quantum dots on Si substrates

Author

Ferreira, S.C. and Ferreira, S.O.

Subjects
*QUANTUM dots, *QUANTUM electronics, *MONTE Carlo method, *CRYSTAL growth
Abstract

Abstract: Recent experiments involving CdTe films grown on Si(111) substrates by hot wall epitaxy revealed features not previously observed [S.O. Ferreira, et al., J. Appl. Phys. 93 (2003) 1195]. This system, which follows the Volmer–Weber growth mode with nucleation of isolated 3D islands for less than one monolayer of evaporated material, was described by a peculiar behavior of the quantum dot (QD) size distributions. In this work, we proposed a kinetic deposition model to reproduce these new features. The model, which includes thermally activated diffusion and evaporation of CdTe, qualitatively reproduced the experimental QD size distributions. Moreover, the model predicts a transition from Stranski–Krastanow growth mode at lower temperatures to Volmer–Weber growth mode at higher ones characterized through the QD width distributions. [Copyright &y& Elsevier]

Published
2006
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42. Fighting cancer with viruses

Author

Ferreira, S.C., Martins, M.L., and Vilela, M.J.

Subjects
*CANCER cells, *TUMOR growth, *SOLUTION (Chemistry), *PHYSICAL & theoretical chemistry
Abstract

Abstract: One of the most promising strategies to treat cancer is attacking it with viruses. Viruses can kill tumor cells specifically or act as carriers that deliver normal genes into cancer cells. A model for virotherapy of cancer is investigated and its predictions are in agreement with results obtained from experimental tumors. Furthermore, the model reveals an oscillatory (periodic or aperiodic) response of tumor cells and virus populations which may make clinical prognosis difficult. These results suggest the need for new in vivo and in vitro experiments aiming to detect this oscillatory response. [Copyright &y& Elsevier]

Published
2005
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43. Application of X-Ray Microtomography to the Microstructural Characterization of Al-Based Functionally Graded Materials

Author

Velhinho, Alexandre, Braz Fernandes, Francisco Manuel, Ferreira, S.C., Rocha, L.A., Vignoles, Gerard, and Cloetens, P.

Abstract

This paper provides a brief overview of the possibilities offered by X-ray computed microtomography, and particularly synchrotron radiation X-ray microtomography, regarding metal matrix composite characterization, emphasis being placed in the case of Al-based functionally graded materials. Examples are provided concerning the characterization of the reinforcement population, interfacial properties, in-situ transformation and damage evolution. The specific needs of the technique and limitations to its widespread use are mentioned.

Published
2006
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