Materials Literature
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External insulation strength assessment of contaminated insulator is proposed in this paper using the acoustic emission signals generated when the polluted insulator flashover discharges. Systematic artificial contamination experiments were done. The acoustic emission signals generated from the polluted insulator were…
Polarized absorption and dielectric spectra of poly (N-carbazole) (PVK) blend with poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) and polyvinylpyrrolidone (PVP) in the same composition ratio were investigated. Polymer coating was carried out using doctor blade technique on a glass substrate. In order to inv…
The statistical data show lightning strike is the major cause of the floating oil tanks ignition and the actual tank stroke-ignition process is still not completely known. The effects of direct lightning stroke on floating oil tank have been studied a lot in previous works and there is little research on the influence…
This paper presents the development and experimental verification of a high-speed permanent magnet motor simulation model. The used motor has maximal speed 42000 RPM, nominal speed 25000 RPM, nominal torque 1,2 Nm and nominal current 11 A. The verification is based on the motor start-up and spin down measurement. Spec…
Using the quantum chemical method PBE0/cc-pVTZ, we determined structural parameters and dipole moments of bullvalene (tricyclo[3.3.2.0 4.6 ]deca-2,7,9-triene), 1-, 2-, 3-, and 4-hydroxytricyclo[3.3.2.0 4.6 ]-deca-2,7,9-trienes, and isomeric 2- and 3-ketones transforming into each other through the keto-enol tautomeris…
Impulse voltage tests are essential to inspect and test insulation integrity of high voltage apparatus. On the other hand, generated impulse currents are used for different test applications such as investigation of high current effects, electromagnetic interference (EMI) testing, etc. Obtained voltage and current wav…
Abstract Summary: In this study it is presented the synthesis and the characterization of Fluorescent‐Magnetic Nanostructures based on polymer‐quantum dots conjugates. Polyvinyl alcohol (PVA) was used as the capping‐ligand for the preparation of CdxMn1‐xS semiconductor nanocrystals via aqueous colloidal chemistry. Dif…
There are a number of competing online partial discharge (PD) measurement systems available in the marketplace today. Since most of these systems utilize procedures and equipment that differ from one another, it has been difficult to compare the results between the varying systems and difficult to provide guidelines t…
The density functional theory was applied to calculate the electronic structure, ground state energy, phonon frequencies at the center and at the boundary of the Brillouin zone, as well as the distribution of magnetic moment over d-orbitals of iron in the magnetically ordered phase of FeTe as functions of the magnetic…
High temperature neutron powder diffraction experiments were carried for a thorough detailed study of the structural evolution and phase transition of lithium niobate. Already at low temperatures part of the Li ions enter the hitherto assumed empty octahedra, their amount increasing with temperature. This explains ano…
The high-power long pulse RF loss properties of CVD diamond windows for ECR heating and plasma stabilization in large fusion devices have been measured by established Fabry-Perot methods [1,2,3]. The dielectric loss is strongly influenced by the surface chemistry of the diamond. Special surface passivation techniques…
The application of variable energy positron annihilation spectroscopy (VE-PAS) methods to the study of perovskite oxide, ABO3, material thin films and near-surface regions is reviewed. The primary focus is on ferroic perovskite titanate oxide materials SrTiO3and Pb (ZrxTi1-x)O3, but studies of BaTiO3, LaxSr1-xCoO3, La…
This study presents the optimization of the process conditions for filled-skutterudites (with a higher melting temperature and a higher aging temperature than the original skutterudites), while many studies have focused only on introducing new filler-atom compositions. For the In-filled In0.3Co4Sb12 system, the maximu…
We have studied the effect of deposition parameters on the microstructure, crystallinity, and ferroelectric properties of 0.88(Bi(0.5)Na(0.5))TiO(3)-0.08(Bi(0.5)K(0.5))TiO(3)¿0.04BaTiO(3) thin films grown on SrRuO(3)-coated SrTiO(3) substrates by pulsed laser deposition. The parameters studied were the repetition rate…
The aging problem of material of composite insulators is one of key issues for power utilities. The most commonly used methods for aging evaluation are observation method, HC water spray classification method and static contact angle method and so on. However, there some subjective factor would be introduced by the op…
The molten carbonate fuel cell (MCFC) is a difficulty in the research field of high-temperature fuel cells at present, and its strict hot start process and running status influence the material performance and life of the cell greatly. To deal with the problem, the MCFC mathematical modeling was analyzed firstly. Then…
The effect of rotor pole-shoe construction on the electromagnetic losses of frequency-converter fed wound-field synchronous motors is studied by numerical simulations. In the machine under examination, a reduction of 6.8 % in the rated-load total electromagnetic losses was achieved merely by modifying the rotor pole-s…
In this paper we research on the run time characteristics of non-magnetic hydraulic navigation simulator and approach a corresponding control strategy. Since the simulator is designed to be non-magnetic, it consists of long hydraulic pipes separating electric part and mechanical part to avoid the magnetic interference…
The article shows the significance of constrained simulation of both the technological and structural behavior of cast parts for the purpose to improve service performance and durability of the parts. Complicated shape cast part was analyzed under loading conditions and as a preliminary the casting process was simulat…
Gallium, aluminum, fluorine, and indium doped ZnO (ZnO:Ga, ZnO:Al, ZnO:F, and ZnO:In) thin films have been deposited by the chemical spray technique on soda lime glass substrates. The effect of different dopant elements on the electrical, optical, structural, and morphological properties has been investigated. The X-r…