Encontrados 21 documentos, a visualizar página 1 de 3
Aplicação da análise exploratória de dados na discriminação geográfica do quiab...
Panero,F. S.; Vieira,M. F. P.; Cruz,Â. M. F.; Moura,M. F. V.; Silva,H. E. B. daForam analisadas amostras de quiabo dos municípios de Caruaru e Vitória de Santo Antão, em Pernambuco, assim como nos municípios de Ceará-Mirim, Macaíba e Extremoz no estado do Rio Grande do Norte. A aplicação de dois métodos de análise exploratória de dados: Análise de Componentes principais - PCA e Análise de Agrupamentos Hierárquicos - HCA permitiu a discriminação geográfica do quiabo proveniente dos dois es...
Strain path and work-hardening behavior of brass
Sakharova, N. A.; Fernandes, J. V.; Vieira, M. F.http://www.sciencedirect.com/science/article/B6TXD-4VCH6XN-2/2/f2fdcdb8e9296ed402996e926d4803b4
Genotyping of methicillin-resistant Staphylococcus aureus isolates obtained in ...
Sousa-Junior,F.C. de; Silva-Carvalho,M.C.; Fernandes,M.J.B.C.; Vieira,M.F.P.; Pellegrino,F.L.P.C.; Figueiredo,A.M.S.; Melo,M.C.N. de; Milan,E.P.Methicillin-resistant Staphylococcus aureus (MRSA) is a major agent of hospital infections worldwide. In Brazil, a multiresistant MRSA lineage (ST239-SCCmecIIIA), the so-called Brazilian epidemic clone (BEC), has predominated in all regions. However, an increase in nosocomial infections caused by non-multiresistant MRSA clones has recently been observed. In the present study, 45 clinical isolates of MRSA obtain...
Solid-state diffusion bonding of gamma-TiAl alloys using Ti/Al thin films as in...
Duarte, L. I.; Ramos, A. S.; Vieira, M. F.; Viana, F.; Vieira, M. T.; Koçak, M.Alternating nanometric layers of titanium and aluminium were used as filler material to promote joining between titanium aluminide samples. The improved diffusivity of these nanometric layers is thought to overcome the difficulties in solid-state joining of titanium aluminides without producing chemical discontinuities at the interface. In this study, a thin multilayer (alternating titanium and aluminium layers...
Nanometric multilayers: A new approach for joining TiAl
Ramos, A. S.; Vieira, M. T.; Duarte, L. I.; Vieira, M. F.; Viana, F.; Calinas, R.A novel intermetallic alloy diffusion bonding procedure is being developed. The innovative aspect relies on the use of sputtered nanometallic multilayers made up of the elements present in the bulk intermetallics to enhance the bonding mechanisms. For this purpose a deep knowledge of the multilayer thin films is required, focusing on thermal phase stability and grain size evolution. [gamma]-TiAl was selected fo...
Assessing the influence of heat treatments on γ-TiAl joints
Guedes, A.; Pinto, A. M. P.; Vieira, M. F.; Viana, FilomenaThe heat treatment of γ-TiAl alloy (Ti-47Al-2Cr-2Nb (at.%)) diffusion brazed joints was investigated. Joining was performed using a Ti/Ni/Ti clad-laminated braze alloy foil at 1050 and 1150ºC with a dwell time of 10 minutes. The joints were subsequently heat treated at 1250 and 1350ºC for 240 and 30 minutes, respectively. The microstructure and the chemical composition of the interfaces were analysed by scannin...
Joint Ti-47 Al-2Cr-2Nb with a Ti-Ni braze alloy
Guedes, A.; Pinto, A. M. P.; Vieira, M. F.; Viana, FilomenaTi-47Al-2Cr-2Nb was joined by diffusion brazing using a Ti-Ni clad-laminated filler alloy. Brazing was performed in the temperature range of 1000 to 1200ºC for 10 min. The microstructure and the chemical composition of the interfaces were studied by scanning electron microscopy (SEM) and by energy dispersive X-ray scans (EDS), respectively. The reaction between the gamma-TiAl alloy and the liquid produced inter...
Joining Ti-47Al-2Cr-2Nb with a Ti/(Cu,Ni)/Ti clad-laminated braze alloy
Guedes, A.; Pinto, A. M. P.; Vieira, M. F.; Viana, FilomenaThe joining of Ti-47Al-2Cr-2Nb using Ti-15Cu-15Ni (wt.%) as braze alloy was investigated. Experiments were conducted at 980 and 1000ºC for 10 min. The microstructure and the chemical composition of the interfaces were studied by scanning electron microscopy (SEM) and by energy dispersive X-ray spectroscopy (EDS), respectively. For both processing conditions the reaction between the gamma-TiAl alloy and the braz...
The Influence of the processing temperature on the microstructure of gamma-TiA...
Guedes, A.; Pinto, A. M. P.; Vieira, M. F.; Viana, FilomenaThe joining of Ti-47Al-2Cr-2Nb (at.%) by diffusion brazing at 1000, 1050 and 1100ºC for 10 min, using a Ti-15Cu-15Ni (wt.%) braze alloy was investigated. The icrostructure and the chemical composition of the interfaces were studied by scanning electron microscopy (SEM) and by energy dispersive X-ray scans (EDS), respectively. The reaction between the gamma-TiAl alloy and the braze alloy led to the formation of ...
On the evaluation of the ductility of thin films
Antunes, J. M.; Menezes, L. F.; Vieira, M. F.; Fernandes, J. V.; Trindade, B.; Ramos, A. S.; Vieira, M. T.A new tensile test procedure has been developed to evaluate the ductility of thin films deposited on a substrate. The tensile sample has a continuously variable cross-sectional area, resulting in a continuous strain gradient along the sample after deformation. The films present cracks where the strain imposed exceeds their ductility. The strain attained at the boundary of the region where cracks appear characte...
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