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- 저자 : Paulo R. O. Brito (검색결과 2 건)
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Cast Aluminum Surface Reinforced with Carbon Nanotube via Solubilization Treatment
Paulo R. O. Brito,Cristhian R. L. Loayza,Mário E. S. Sousa,Eduardo M. Braga,Rômulo S. Angélica,Simone P. A. da Paz,Marcos A. L. Reis 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Carbon nanotubes (CNTs) are noteworthy, as they reinforce the metallic matrix, due to mechanical properties, such asthe ~ 1.0 TPa Young module. To improve the maintenance of the commercially pure aluminum surface, multi-walled carbonnanotubes were incorporated into the aluminum surface with heat treatment by solid solubilization, in order to improvethe surface properties of aluminum. The aluminum samples were chemically attacked for 30, 60 and 120 s and placed in acontainer with CNTs, being subjected to a temperature of 640 °C for 1 h. Then, the roughness was evaluated by a roughnessmeter for morphology in the scanning electron microscopy. An intensity of aggregation of CNTs was evaluated by XRD, andthe Raman Spectra has evaluated the transfer of charge to the matrix. Microhardness was performed to evaluate the influenceof the incorporation of CNTs in the matrix. The results obtained show that the incorporation of CNTs in the aluminummatrix increases the hardness in approximately 20% of the surface, in comparison with the control sample. The process ofincorporating CNTs into the aluminum matrix by solubilization is a promising, simple and inexpensive alternative to improvethe durability of the aluminum surface.
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Brito Giovani G.,Concenço Germani,Costa Vladimir E.,Fagundes Paulo Ricardo R.,da Silva-Filho João Luis,Parfitt José Maria B.,Magalhães Ariano,Silva Giovana T.,Jardim Thaís M.,Luccas Nathália Furtado,S 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.1
Phenotyping is the major bottleneck in the efort to develop varieties of rice (Oryza sativa L.) suitable for growing under a water-saving irrigation management, such as alternate wetting and drying irrigation techniques (AWD). To analyze if the genotypic variability for carbon isotope discrimination (CID) in rice leaves could be used as a relatively high-throughput tracer to early select superior genotypes highlighting improved root architecture traits when submitted to AWD, a set of twenty varieties grown under semi-natural conditions were submitted to two water irrigation regimes, continuous fooding (CF) and AWD cycles. Coefcients of genetic variance (π2g) obtained for root architecture, micro-morphological and physiological traits were signifcant for all of them regardless of the adopted irrigation system, except to mean root diameter. The three signifcant principal components (PCs) with eigenvalue>1, explain most of the total variation across cycles and water regimes. For most of analyzed traits, the values of heritability coefcients were higher regardless of adopted irrigation management and trait category; for CID, the magnitudes of broad heritability at an individual level (greater than 0.80) were similar in the two irrigation techniques, evidencing that the success of the selection is independent of irrigation management. The higher CID values after three AWD cycles are associated with varieties with higher total root length and volume. To our knowledge, this is the frst study demonstrating the potential application of CID as a tracer to select root architecture traits in rice when water-saving irrigation management is of concern
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