Materials Literature
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In general, it is hard for discharge to be initiated in a small void existing in solid insulating material because of insufficient initial electrons. For this reason, the discharge occurs after a long delay even at a critical electric field to initiate discharge. In this study, the initial electrons are supplied by X-…
The roles of graphene in shape memory polyurethane nanocomposite (SMPUN) as a reinforcing filler, as a fixed structure for memorizing a specified original shape, and as a conductive filler to actuate shape recovery by resistive heating, were examined. The effectiveness of each role was modulated by functionalizing gra…
As the temperature difference exists between the inner and outer conductors of high voltage DC cables in practice, it is important to study space charge behavior under temperature gradient. However, due to the effect of temperature on the acoustic propagation, it is necessary to study the waveform recovery method in p…
The distributions of the electric voltage U ( t ) that is read from an induction magnetic head as it scans a discrete magnetic medium with residual magnetic field records that were obtained under the action of a pulsed magnetic field with different-polarity surges on a magnetic medium with a tested object are given. T…
Insulations in high voltage engineering are a concern to users in terms of its performance, expected lifetime, and long-time reliability. Insulation failure can allow leakage current (LC) to flow and causes tracking and erosion as well as flashover. Tracking and erosion test complying with BS EN 60857-2007 are conduct…
For the first time, the phase diagrams of the systems Gd2S3-Gd2O3 and Dy2S3-Dy2O3 were constructed within the temperature range from 870 K to the melting point. In the systems, compounds Gd2O2S and Dy2O2S form in hexagonal symmetry with the unit cell parameters a = 0.3858 nm, c = 0.6667 nm and a = 0.3802 nm, c = 0.659…
Mesoporous Fe 3 O 4 /carbon dots (CDs)/silica microspheres with large surface area, good fluorescence and magnetic property have been synthesised with as‐prepared Fe 3 O 4 nanoparticles, silane‐functionalised CDs and tetraethyl orthosilicate as co‐precursors and cetyltrimethyl ammonium bromide as the pore‐directing ag…
This paper gives an overview of recent activities in the production of natural fiber- -reinforced polyurethane (PUR) composites. Extensive research is being conducted to develop marketable solutions for the production of bio-based plastics. In composite applications, natural fibers can be used as a substitute for synt…
We have investigated the magnetic and the dielectric properties of åkermanite Sr 2 CoSi 2 O 7 and Sr 2 MnSi 2 O 7 single crystals. Sr 2 CoSi 2 O 7 shows a canted antiferromagnetism with a large magnetic anisotropy at temperatures below 7 K. By applying a magnetic field along the [110] direction, an electric polarizati…
Capabilities of crystal plasticity finite element (CPFE) model in application to modeling polycrystalline aluminum sample behavior during plain strain compression test are discussed within the present work. To simplify analysis of material behavior during plain strain compression the aluminum specimen is composed of o…
A two-dimensional (2D) crystal formed by a system of identical atoms with a pair centrosymmetric interaction between them is considered. It is assumed that in the initial state of equilibrium atoms occupy sites of a flat translation-symmetrical mesh, and the deformed state appears as a result of their displacements in…
Catalytic oxidation of volatile organic compounds (VOCs) was carried out over a composite catalyst comprising Pt/γ-Al₂O₃ and protonated beta zeolite. The conversion of several VOCs such as ethyl acetate, butyl acetate, 2-propanol, 1,2-dichloroethane, and chloroethane over the composite catalyst was higher than the con…
An improved expanding ring experimental technique has been described to determine dynamic material properties under conditions approximating uniform one-dimensional tensile loading. There are mainly explosive expanding ring technique and electromagnetic expanding ring technique currently, for which exist many limitati…
The inhibitor property of Murraya koenigii extract and Cymbopogen citratus extract at in 0.25-1.0 M H2SO4 concentration is investigated with Taguchi dynamic approach. The results show the inhibitor property of Murraya koenigii extract is better than Cymbopogen citratus extract. The optimum parameter setting is 1.5 hou…
Using the electrochemical polarization resistance technique, the inhibitor behavior of potassium-o-ethyl dithiocarbonate (potassium ethyl xanthate) is studied for copper in a 3.5 % NaCl aqueous solution. The inhibition mechanism is mixed, apparent activation energy with inhibitor being greater than without inhibitor.…
Abstract In this article, we discuss how fluorescence microscopy techniques are used to investigate important characteristics of porous silica materials. We start with a discussion of the synthesis, formation mechanism and functionalization of these materials. We then give an introduction to single molecule microscopy…
The inhibition of a substituted naphthol compound, 4-(4-nitrophenylazo)-1-naphthol (44NIN), on the corrosion of aluminium (Al) in a basic medium was studied by classical chemical (gravimetric) and spectrophotometric (UV–Vis and FTIR) methods at 303–333 K. 44NIN demonstrated an excellent inhibiting property to Al corro…
A series of FeCo-SiO2 granular films of different FeCo atomic concentration (33-54%) have been prepared by fast atom beam sputtering technique and post-annealed in inert (Ar) and reducing (H2) gas environments. Fe and Co K-edge XANES analysis of as-deposited films indicate that both Fe and Co are present mainly in the…
DC insulation resistance (IR) and polarization index (PI) testing is very widely used to assess the condition of the rotor and stator windings in motors and generators. The IR/PI tests are good at identifying contaminated windings; however, such issues as thermal deterioration or abrasion of the insulation due to coil…
The life-time of oil-impregnated (OI) insulation is mainly governed by two aging mechanism, i.e. electrical and thermal. The electrical-life law takes the form of inverse power law. In this case the life is inversely proportional to the applied electrical stress. Due to continuous voltage application, the insulation l…