Materials Literature
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Water tree is a degradation mode of power cable with polymeric insulation. A water tree is composed of small droplets filled with water. As the conductivity in water tree is very high, it leads to dielectric breakdown when it grows up. As inside the water tree is filled with trap sites, it is polarized with a certain…
Polyethylene/montmorillonite (LDPE/MMT) nano-composites are prepared by melting intercalation process. The characteristics of electrical breakdown and partial discharge (PD) of the nano-composites are investigated. The test results indicate that electrical breakdown strength of LDPE/MMT is obviously higher than that o…
Electrical treeing is an electrical prebreakdown phenomenon commonly found in solid dielectrics. It is a damaging process due to partial discharge (PD) and progresses through the stressed insulation by chemical degradation whose path resembles the form of a tree root. The characteristics of PDs due to electrical treei…
The absorption, luminescence, and excitation spectra of CaF2, SrF2, and BaF2 crystals with EuF3 or YbF3 impurity have been investigated in the range 1–12 eV. In all cases, strong wide absorption bands (denoted as CT1) were observed at energies below the 4f n -4f n − 15d absorption threshold of impurity ions. Weaker ab…
Power transformers are one of the most important and also expensive components of the electrical power supply. In electrical networks, power transformers are of essential importance as interface between different system voltage levels. Due to the long manufacture process they are one of the most critical and high-pric…
In the oxide electrowinning method of nuclear fuel recycling, the applicability of the pulse electrolysis methodto the mixed-oxide (MOX) codeposition process was evaluated. Several experiments were conducted involving uranium, plutonium, and elements simulating fission products (FPs) or corrosion products (CPs). Throu…
Pb 1- x Sr x Te thin films with different strontium (Sr) compositions are grown on BaF 2 (111) substrates by molecular beam epitaxy (MBE). Using high resolution x-ray diffraction (HRXRD), we obtain Pb 1- x Sr x Te lattice constants, which vary in the range 6.462-6.492Å. According to the Vegard law and HRXRD data, Sr c…
Ni, Ni/Ir and Ni/Ru electrodeposited electrodes on AISI 316 stainless steel gauze have been studied as electrocatalysts for the oxygen evolution reaction in 5M KOH solution at room temperature. Oxygen evolution on the coated electrodes occurs only after the oxidation of the electrode surface. The Ni/Ir electrode offer…
Finite element method (FEM) was used to study the electric field distribution along creepage path of a cap and pin porcelain insulator string of transmission line. The effect of pollution layer conductivity and dry band width is considered in order to investigate electric field behaviors of insulator using in polluted…
Cancer nanotechnology is a cross-disciplinary field of research in science, engineering, and medicine for cancer imaging, molecular diagnosis, and targeted therapy; which refers to use of a vast & diverse array of devices smaller than 100 nanometers.These devices include nanovectors for targeted delivery of anti cance…
In this study, sorption and desorption of two wood plastic composites (WPCs), along with solid southern pine, and white oak were investigated in humidity controlled chambers. Equilibrium moisture content (EMC) obtained for WPC, softwood (southern pine), and hardwood (white oak) sorption after 45 days of experimentatio…
The structure and the charge transport properties of poly(ethylene terephthalate) track membranes modified in a thiophene plasma were studied. It was found that polymer deposition on the surface of a track membrane via the plasma polymerization of thiophene results in composite membranes that, in the case of the forma…
Recently, the author presented a simple equation to approximate the density profile inside a symmetric structural polymer foam (Rodrigue, D. (2007)). This equation, based on a generalized Fourier series approximation, is now used to predict the apparent flexural modulus of these foams. The calculations are compared wi…
Carbon nanotubes (CNT) are considered promising nano-scale materials because of their unique structural, mechanical and electronic properties. Due to their long seamless cylindrical shaped structures they could be applied as effective nano-channels for mass transfer and relevant storages for hydrogen molecules. We stu…
Abstract Hybrid nanoparticles with a polystyrene core and a hybrid copolymer shell were used to produce hybrid nanocapsules by dissolving the polystyrene core from the previously elaborated core‐shell particles. Following previous works, the core‐shell particles were prepared by emulsion polymerization of styrene and…
Amostras de caulinita oriundas da região do Rio Capim, estado do Pará, Brasil, foram intercaladas com dimetilsulfóxido - DMSO. As amostras de caulinita naturais e intercaladas foram utilizadas em processo de adsorção com Zn(II) em meio aquoso em pH 5,0 e temperatura controlada de 298 ± 1K. As propriedades físico-quími…
This study characterizes the performance of several diesel oxidation catalyst (DOC) formulations with respect to their ability to heat up engine exhaust for the purpose of regenerating a diesel particulate filter or desulphating a lean nitrogen oxide (NO x ) trap. Platinum (Pt), platinum—palladium (Pt—Pd), and platinu…
We report the experiment results and data analyses based on a polaron exchange model for La 0.7 Ca 0.3 MnO 3 and Pr 0.7 (Sr 1-x Ca x ) 0.3 MnO 3 epitaxial thin films. In the polaron exchange model with an energy balance condition, critical temperature of T C for stable ferromagnetic (FM) ordering should depend on δE a…
The analysis of prospects of development nanoelectronics and silicon nanotechnology is carried out. The information on a condition of works on manufacturing integrated microcircuits on technological norms 32, 45, 51, 55 and 60 nm is resulted. The basic results of plasma etching of silicon in CCl2F2/O2in quartz reactor…
Abstract The specially designed, fully equipped, and computerized devices for the underwater long‐term measurements have been used to study the hydrogen permeation rate through the structural steels under natural sea water conditions. By applying constant cathodic potentials, the polarization current and the hydrogen…