Materials Literature
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A geometrical model of the well-known “mattress” effect, which is similar to the one observed at the opening of an umbrella, is built. The main hypothesis is that the surface of metallic mesh of a parabolic reflector takes a form closed to the minimal surface in the isotropic case. The fact that, for the orthotropic m…
SiOC ceramic as anode material for lithium ion batteries has received extensive attention recently. In this work, polycarbosilane and polymethylhydrosiloxane were used as precursor polymers through a curing, pyrolysis and ball-milling progress to synthesize three kinds of ceramic powders with different components note…
Polymer nanocomposites, when prepared and treated carefully, have the potential to offer many advantages over the current materials used in high voltage applications. Four materials have been prepared containing 2 wt%, 5 wt%, and 10 wt% of hexagonal boron nitride nanofiller, including an unfilled material based on a p…
S E Borjas-García, A Medina-Flores, L Béjar, P Martínez-Torres, N Dasgupta-Schubert, J L Bernal; Synthesis of Mesoporous Ceria by Using CTAB as Template, M
In this research several optimization methods were used to determine the optimal design for a corona ring. The following methods were utilized: Nelder-Mead, COBYLA and BOBYQA. In addition, a software based on the Finite Element Method was used to perform electric field simulations. Results show that the optimized coro…
Internal insulation defects of oil-immersed transformers are common because of flaws in both manufacturing and transportation process. Partial discharge (PD) activity caused by insulation defects may occur at rated voltage condition, leading to deterioration of material, which results in breakdown of insulation. Featu…
Hybrid solar cells with ITO/AZO/ZnS/P3HT/PCBM/Ag structure were fabricated so that, in the synthesis of the ZnS layer, the successive ion layer absorption and reaction (SILAR) technique was used. At first, Al-doped ZnO (AZO) layers with different molar concentrations of Al were deposited on ITO-glass substrates, and t…
Matthew J Cabral, Shujun Zhang, Elizabeth C Dickey, James M LeBeau; Direct observation of local chemistry and local cation displacements in the relaxor fer
Ronald Vane, Ewa Kosmowska; Remote Plasma Cleaning and Radical Recombination Rates, Microscopy and Microanalysis, Volume 22, Issue S3, 1 July 2016, Pages 4
In this study, polyindole (PIN) and polystyrene/polyindole (PS/PIN) composites were synthesized by chemical polymerization using FeCl3 as an oxidant agent. The conductivities of PIN and the composites were measured with a four-probe technique. The conductivity of PIN was determined as 5.1 × 10 –3 S cm –1 , whereas the…
This paper presents an investigation into the influence of different operating conditions of HVDC converters on partial discharge behavior occurring within solid dielectrics. Cables at the DC side undergo different stresses due to transients and harmonics that may result in an intensified level of partial discharge (P…
Results of a study of the structure of porous carbon materials (PCMs) prepared by the carbonization of plant raw materials and the modification of oxidized or thermally expanded graphite have been described. It has been experimentally found that the studied materials have a porous fractal structure with an average mic…
The mechanism of formation of the two-dimensional conductivity along the interface between two polymer dielectrics is experimentally studied. The idea of “polar catastrophe,” which was successfully used earlier to explain the electronic properties of the interface between two perovskites LaAlO 3 /SrTiO 3 , is chosen a…
Cable accessories made of ethylene-propylene-diene terpolymer (EPDM) are considered to be the weakest part of HVDC cable system due to the existence of the interface between cable insulation and itself. The charges are likely to accumulate at the interface between insulation materials with different conductivity and p…
Polarization and depolarization measurements of alumina-filled epoxy samples are presented. Discussed are the effects of temperature and electric field, as well as the dependences on sample thickness, contacting method and aging duration on DC currents. Such investigations are crucial to establish reliable generic con…
Epoxy resin is widely used in electronic and electrical devices because of its excellent insulation properties. The surface charge accumulating on epoxy resin may cause electric field distortion which would lead to surface flashover. That TiO2nano particles were doped in the epoxy resin can enhance the mechanical prop…
The work describes the methods of manufacturing single cells of solid oxide fuel cell (SOFC) with thin–film YSZ and CGO electrolytes and also with the bilayer YSZ/CGO electrolyte. Formation of YSZ and CGO films on the supporting NiO–YSZ anode of SOFC was carried out using the combined electron–ionic–plasma deposition…
Summary Biaxial‐oriented polypropylene (BOPP) is one of the most used materials for industrial films and food packaging. In terms of environmental and economic issues, the reduction of the film thickness, increasing the homogeneity, enhancing the process efficiency and stability are in the focus of this work. A system…
The article presents the results of experiments to study the creep of an intermetallic monocrystalline alloy used to manufacture nozzle blades. The results serve as a basis for calculating the creep-rupture strength and thermal fatigue of gas-turbine engine blades.
As part of a continued effort to improve the understanding of material time-dependent response, a series of mechanical tests have been conducted on the titanium alloy, Ti-6Al-4V. Tensile, creep, and stress relaxation tests were performed over a wide range of temperatures and strain rates to engage various amounts of t…