Materials Literature
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Luminescent films of TiO 2 : Sm were prepared by the sol-gel method using the spray pyrolysis technique. Various techniques (including IR absorption, Raman, AFM, XPS, photoluminescence) were used to characterize the samples. After a thermal treatment up to 750°C, intense Sm 3+ luminescence with a well-resolved fine st…
A lectotype and epitype are designated for the freshwater epipelic diatom Navicula bacillum Ehrenberg, now generally referred to as Sellaphora bacillum (Ehrenberg) D.G. Mann. The lectotype is an original drawing preserved in the Ehrenberg collection at the Museum fĂźr Naturkunde in Berlin, which shows a naviculoid dia…
The excellent performance of a 100-GB-capacity write-once disk was demonstrated. The disk has quadruple recording layers, i.e., Layer 3, 2, 1, and 0 (from the laser-incident side of the disk) based on the 4 × Blu-ray disc (BD) format. Each layer is provided with a phase-change type memory film of Te–O–Pd, whose thickn…
Synthesis of single‐walled carbon nanotubes by arc‐discharge technique has been realized in nitrogen atmosphere with Ni:Y2O3 catalyst. Presence of carbon nanotubes in the synthesized material has been confirmed by a Raman spectroscopy and by a transmission electron microscopy. The synthesis parameters (gas pressure, a…
Based on scalar model of elasticity, we investigate the acoustic phonon transport and ballistic thermal conductance in a three-dimensional double-bend quantum structure at low temperatures using scattering matrix method. The results show that the quantum steps of the acoustic phonon transport probability is observed o…
The growing environmental awareness throughout the world has triggered a shift towards designing environmentally friendly materials from sustainable renewable resources. Natural fibre reinforced composites are already being used for construction and automotive applications and now can play a significant role as second…
This paper describes a novel approach for identifying induction motor electrical parameters in function of flux levels based on experimental transient measurements from a vector controlled induction motor (I.M.) drive and using an off line genetic algorithm (GA) routine with a linear machine model. The evaluation of t…
This work deals with the representation of three-phase and three-limb transformers in two dimensions using FEMM (finite element methods on magnetics). The transformer magnetization curve is obtained using the magnetization characteristic for the silicon steel used when assembling the transformer core, associated to th…
Abstract The structural relaxation of nanographite ball‐milled in argon atmosphere and stored in evacuated ampoules, has been studied by monitoring the evolution of the Raman spectra. Reduction of some Raman bands associated with “in‐plane” structural defects, such as vacancies, dislocations or grain boundaries, and t…
Density-functional theory based on first principles is used to investigate oxidation of a semiconducting graphene nanoribbon with armchair edges (9-AGNR) by oxygen. The calculated results demonstrate that the oxygen is favorably physisorbed on the inner of 9-AGNR, while the oxygen is chemisorbed at the edge of 9-AGNR.…
In this paper, an analytical phase transition model is coupled self-consistently with the electro-thermal transport model. The phase space model and the transition dynamic is described. The resulting phase-electro-thermal simulation model is applied to an illustrative example structure. The self-consistency of the app…
With the broad application of silicone rubber (SIR) insulator in high-altitude regions, corona degradation is one of the inevitable electrical degradation caused by electric stress due to the organic properties of SIR. Although this phenomenon is investigated at atmospheric pressure, there is little investigation at l…
Quantitative applications of surface-enhanced resonance Raman scattering (SERRS) are often limited by the reproducibility of SERRS intensities, given the difficulty of controlling analyte-substrate interactions and the associated local field enhancement. As demonstrated here, SERRS from dye molecules even within the s…
The variation of the open circuit potential of the Fe electrode in strongly oxygenated solutions of Na2 CO3 of different concentrations is followed until steady state values are established. In all solution concentrations, the steady state potentials Est. are approached from negative values, denoting oxide film repair…
The temperature dependence of the bulk modulus of polyisoprene has been studied using molecular dynamics simulations. Virtual polyisoprenes have been submitted to volume contractions above and below the glass transition. Bulk modulus has been observed to be linearly dependent on temperature both above and below the gl…
We prepared BaTiO 3 –CoFe 2 O 4 composite thin film on (La 0.5 Sr 0.5 )CoO 3 /CeO 2 /YSZ/Si(100) substrate by pulsed laser deposition. Simultaneous epitaxial growths of BaTiO 3 and CoFe 2 O 4 were achieved. Reciprocal space map measurement revealed that the lattice parameters of BaTiO 3 parallel and perpendicular to t…
Raman spectroscopy is utilized to study the evaluation of vacancies in PbTiO 3 thin films subjected to hydrogen atmosphere heat treatment. The B 1 mode consisted of only oxygen ion vibration was shifted to lower frequency with increasing heat treatment temperature. It was considered that the oxygen ions were lacking f…
Troubleshooting resonance problems within alternating current induction motor systems has always presented difficult challenges for motor manufacturers and end users alike. Often, the changes in structural stiffness from a motor manufacturer's rigid foundation to a less stiff field base can produce drastically differe…
A matriz termoplástica semicristalina PEKK (poli (éter-cetona-cetona)) tem recebido nos últimos anos uma atenção crescente pelas indústrias aeronáutica e espacial, no processamento de compósitos poliméricos avançados. As características de elevados valores de temperatura de transição vítrea, de resistência mecânica e…
O crescimento do consumo de plásticos vem gerando grandes problemas ambientais, pois um polímero, uma vez descartado no ambiente, necessita de mais de cem anos para se degradar. O plástico ideal deve apresentar propriedades industriais desejáveis e, ao mesmo tempo ser degradável num período considerado satisfatório. B…