Materials Literature
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Pattern recognition and time location of power quality disturbances using TT-transform is proposed in this thesis. TT-transform is performed to the original signal and the result is a complex matrix. The absolute value of the complex matrix called modulus matrix. Unit cylinder is got by every row vector of modulus mat…
Samples of epoxy filled with micrometric quartz were prepared with or without the addition of a small amount of nanoclay, in regard to the quartz content. The influence of the nanofiller on heat treatment after curing was characterized using dielectric spectroscopy. It was put in evidence that the addition of nanofill…
The purpose of this study was to describe the upslope method-derived myocardial perfusion index using the parameters based on a tracer kinetic model of iodixanol contrast agent and to validate this theoretically derived relationship using an ischemic canine model. The established modified Kety model was used to descri…
Understanding the long term electrical degradation of polymeric insulation is of great importance in extending the life of high voltage cable insulation. Space charge is thought to play a significant role and the behaviour and energy dissipations of charge carriers within polymeric materials are of continued interest.…
Layered perovskite-type oxides were characterized by electrochemical measurement. Five kinds of perovskite oxides (LaSr3Fe3O10, NaLaTiO4, Sr4Co1.6Ti1.4O8(OH)2⋅xH2O, RbLaNb2O7 and LaFeO3) were used as electrolyte of fuel cells. Every perovskite oxide could generate current and high open circuit voltage (>0.8 V). The re…
This paper aims to analyse the influence of the atmospheric relative humidity level (RH) on the collection efficiency of a wire-to-plane electrostatic precipitator (WP-ESP). The experiments were performed with incense smoke particles having a mean size of about 0.28 μm. An aerosol spectrometer was employed for charact…
Setting out from the results found in a set of small-angle neutron scattering (SANS) experiments for neutron-irradiated Fe-Cu model alloys, a rate theory model for the simulation of the irradiation-induced time-evolution of Cu-rich precipitates in these model alloys is presented which follows the idea that the precipi…
Abstract We report three novel heteroleptic ruthenium complexes, RD1: Ru[(dcbpy)(1‐methyl‐2‐(pyridin‐2‐yl)‐1H‐benzimidazole)(NCS)2, RD2: Ru [(dcbpy) (2‐(pyridine‐2‐yl) benzothiazole) (NCS)2, and RD3: Ru[(dcbpy)(2‐(pyridin‐2‐yl) benzoxazole) (NCS)2, for dye‐sensitized solar cell applications. We found that RD1 exhibits…
Knowledge of the external field distribution around high voltage apparatus is of vital importance. As a part of the effort to improve the physical understanding of the DC field distribution outside high voltage apparatus, a small probe that can measure DC electric fields has been developed and a first version of this…
The formation of the diamond phase of carbon under extreme static and dynamic conditions is considered.
The performance of outdoor insulation greatly influences the reliable and safe operation of the electric power transmission and distribution systems. The two most commonly used accelerated aging tests are the application of rotating wheels and fog chambers. The paper first reviews the setup and the application of thes…
Abstract In the present study, ITO nanowires electrode within the anodized TiO2 nanotubes without using the polycarbonate membrane templates were attempted. The process begins with an anodized TiO2 nanotube arrays (TNA) and subsequent growth of indium‐tin‐oxide (ITO) nanowires into the TiO2 nanotube arrays via the ele…
This work concerns the study of electrical properties of polymer nanocomposite materials. Through the addition of nanoparticles in a polymer matrix, we seek to improve the physical properties of these “innovative” materials. We propose to study the influence of incorporating silica nanoparticles in a HDPE matrix on th…
SmartCrown work roll contour has been brought in China for several years, but the research of crown control characteristics of SmartCrown work roll is lacking, especially the relationship and difference between SmartCrown and CVC work rolls. The paper researched the principle and design method of SmartCrown work roll…
Paraíba is the main natural bentonite producing state of Brazil. Besides the advantage of abundance of bentonite clays, its transformation in organoclay is a simple method and there is only little study about the commercialization of Brazilian organoclays. In this work, Brazilian bentonite clay was organophilized with…
The possibility of thermal treatment plants of municipal wastewater is an alternative solution for the final disposition of the sludge produced on small cities as Barueri, a small town of São Paulo State, Brazil. Combustion and pyrolysis of that municipal waste, occurring respectively in air and nitrogen, have been st…
Abstract Polyethylene (PE) resins used for Rotational Molding have usually particle sizes less than 0.8 mm and used as powders or micro‐pellets. During heating in a rotating mould, these particles get fused and merge into one piece. A disadvantage of the rotomolding process is long cycle times that affect the producti…
We present our investigation of organic solar cells by modeling and simulation after numerically solving Poisson and continuity equations that describe the electric property of semiconductors. Specifically, simulations reveal that Langevin type recombination, which describes the loss mechanism in pristine materials wi…
This paper report on an theoretical investigation using FEA simulations on the stress distribution in medium voltage cable joints. Three different supplies namely 50 Hz sinusoidal, VLF 0.1 Hz sinusoidal and VLF 0.1 Hz cosine square were evaluated. The simulation results show that phase shifts occur in the stresses und…
Gold nanoparticles (AuNP) continue rising a strong interest for research and especially in the field of biosensors as attested by growing number of publications. One reason is that AuNP exhibit an optical response dominated by the localised surface plasmon resonance (LSPR) that is highly sensitive to the molecular env…