Encontrados 11 documentos, a visualizar página 1 de 2
Synergistic helium and deuterium blistering in tungsten–tantalum composites
Dias, M.; Mateus, R.; Catarino, N.; Franco, N.; Nunes, D.; Correia, J. Brito; Carvalho, P. A.; Hanada, K.; Sârbu, C.; Alves, E.Tungsten–tantalum composites with 10 and 20 at.% Ta were prepared by ball milling W powder with Ta fibers and by consolidating the milled materials with spark plasma sintering. The composites were implanted at room temperature with He+ (30 keV with a fluence 5 1021 at/m2) and/or D+ (15 keV with a fluence 5 x 1021 at/m2) ion beams. The materials were studied by scanning and high-resolution transmission electron ...
Effects of helium and deuterium irradiation on SPS sintered W–Ta composites at ...
Mateus, R.; Dias, M.; Lopes, J.; Rocha, J.; Catarino, N.; Franco, N.; Livramento, Vanessa; Carvalho, P. A.; Correia, J. Brito; Hanada, K.; Alves, E.Energetic He+ and D+ ions were implanted into different W–Ta composites in order to investigate their stability under helium and deuterium irradiation. The results were compared with morphological and chemical modifications arising from exposure of pure W and Ta. Special attention was given to tantalum hydride (Ta2H)formation due to its implications for tritium inventory. Three W–Ta composites with 10 and 20 at...
CdTe nano-structures for photovoltaic devices
Corregidor, V.; Alves, L. C.; Franco, N.; Barreiros, Maria Alexandra; Sochinskii, N. V.; Alves, E.CdTe nano-structures with diameter of ∼100 nm and variable length (200–600 nm) were fabricated on glass substrates covered with conductive buffer layers such as NiCr, ZAO (ZnO:Al2O3 + Ta2O5) or TiPd alloys. The fabrication process consisted of the starting vapour deposition of metal catalyst dropped layer followed by the isothermal catalyst-prompted vapour growth of CdTe nano-structured layer of controllable sh...
Structural and optical studies of Au doped titanium oxide films
Alves, E.; Franco, N.; Barradas, N. P.; Nunes, B.; Lopes, J.; Cavaleiro, A.; Torrell, M.; Cunha, L.; Vaz, F.Thin films of TiO2 were doped with Au by ion implantation and in situ during the deposition. The films were grown by reactive magnetron sputtering and deposited in silicon and glass substrates at a temperature around 150 °C. The undoped films were implanted with Au fluences in the range of 5 × 1015 Au/cm2–1 × 1017 Au/cm2 with a energy of 150 keV. At a fluence of 5 × 1016 Au/cm2 the formation of Au nanoclusters ...
Testes físico-mecânicos e físico-químicos do couro da tilápia vermelha
Godoy,L.C.; Gasparino,E.; Franco,M.L.R.S.; Franco,N.P.; Dourado,D.M.Realizaram-se testes físico-mecânicos e físico-químicos em couro de tilápia vermelha (Oreochromis spp.) a fim de testar a sua resistência. As amostras foram distribuídas em delineamento inteiramente ao acaso com dois tratamentos: no T1, procedeu-se à retirada do corpo-de-prova no sentido longitudinal e, no T2, à retirada do corpo-de-prova no sentido transversal. Para os testes de determinação da resistência à t...
Microstructural characterization of the ODS Eurofer 97 EU-batch
Mateus, R.; Carvalho, P. A.; Nunes, D.; Alves, L. C.; Franco, N.; Correia, J. Brito; Alves, E.Four as-processed forms (Plate 16, Plate 6, Rod 20 and Rod 12.5) of the ODS Eurofer 97 EU-batch produced under different thermomechanical conditions have been investigated by scanning nuclear microprobe, scanning and transmission electron microscopy, energy dispersive X-ray spectroscopy, electron backscattered diffraction, hightemperature X-ray diffraction and microhardness measurements. The materials presented...
Structural and optical properties of Zn0.9 Mn0.1 O/ZnO core-shell nanowires des...
Kaydashev, V.E.; Kaidashev, E.M.; Peres, M.; Monteiro, T.; Correia, M.R.; Sobolev, N.A.; Alves, L.C.; Franco, N.; Alves, E.Core-shell ZnO/ZnMnO nanowires on a-Al2O3 and GaN (buffer layer)/Si (111) substrates were fabricated by pulsed laser deposition using a Au catalyst. Two ZnO targets with a Mn content of 10% were sintered at 1150 and 550 °C in order to achieve the domination in them of paramagnetic MnO2 and ferromagnetic Mn2O3 phases, respectively. Cluster mechanism of laser ablation as a source of possible incorporation of seco...
Projecto Rodentia : etologia aplicada na sala de aula do 1º Ciclo
Franco, N. H.; Olosson, A.; Santos, J. B.; Brosseron, F.; Pinto, A.; Ricardo, E.O Projecto Rodentia, implementado no ano 2006/2007, visa promover a cultura científica em alunos do 1º ciclo do Ensino Básico, familiarizando-os com o Método Científico e desenvolvendo competências conceptuais, processuais e atitudinais, com base na Etologia Aplicada e na reflexão ética sobre o bem-estar animal. Foram instalados em três salas de aula habitats especialmente desenhados, contendo cada um dois rato...
Microstructure characterization of ODS-RAFM steels
Mateus, R.; Carvalho, P.; Nunes, D.; Alves, L. C.; Franco, N.; Correia, J. Brito; Fernandes, H.; Silva, C.; Alves, E.; Lindau, R.Results of the microstructural characterization of four different RAFM ODS Eurofer 97 batches are presented and discussed. Analyses and observations were performed by nuclear microprobe and scanning and transmission electron microscopy. X-ray elemental distribution maps obtained with proton beam scans showed homogeneous composition within the proton beam spatial resolution and, in particular, pointed to a unifo...
Microwave dielectric permittivity and photoluminescence of Eu 2O3 doped laser h...
Rubinger, C.P.L.; Costa, L.C.; Macatrão, M.; Peres, M.; Monteiro, T.; Costa, F.M.; Franco, N.; Alves, E.; Saggioro, B.Z.; Andreeta, M.R.B.We report the microwave dielectric properties and photoluminescence of undoped and europium oxide doped Ta2O5 fibers, grown by laser heated pedestal growth technique. The effects of Eu2O3 doping 1–3 mol % on the structural, optical, and dielectric properties were investigated. At a frequency of 5 GHz, the undoped material exhibits a dielectric permittivity of 21 and for Eu2O3 doped Ta2O5 samples it increases,...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||