Materials Literature
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Due to high dielectric strength, high resistance to water treeing, and thermal stability, the Ethylene Propylene Rubber (EPR) is an excellent choice for polymeric cable insulation. As for its higher dissipation factor, the usage of EPR materials for power cable insulation is limited to 154 kV. For the typical medium v…
The problem of taking into account Fermi liquid effects in the theory of electron states of epitaxial graphene formed on a metallic substrate is considered on the basis of the Anderson-Newns model. Analytic expressions were obtained for charge transition in the “epitaxial graphene plus size-quantized film” system. Fer…
In this contribution, we report on the analysis of charge transport in graphene nanoribbons by means of timedomain and frequency-domain techniques. The former can be applied in order to describe the Maxwell/Schroedinger coupled system of equations, and the letter are used to solve the Poisson/Schroedinger system in a…
The grain-boundary diffusion (GBD) of germanium in copper and its alloys Cu-2% Ge and Cu-0.5% Fe is investigated in the temperature range of 500–590°C by means of electron-probe microanalysis. The GBD parameters (triple product P = sδD GB and effective activation energy E) are found. The temperature dependence of the…
The determination of the condition of the stator core insulation between the iron sheets of large rotating electrical machines is important for a safe and economic operation. There are different methods available to determine this condition. Because of the relevance of the topic, this work gives an overview over the t…
Ba(Zr x Ti 1- x )O 3 (BZT) thin films with different Zr contents were deposited on (100) MgO and (100) Pt/(100) MgO substrates by RF-magnetron reactive sputtering using metal targets. The BZT (0 < x < 0.89) thin films had a single perovskite phase with only (001)/(100) orientation. In all cases, the ratio of Ba/Ti was…
The temperature dependence of the complex relative permittivity in a relaxor ferroelectric solid solution 24Pb(In 1/2 Nb 1/2 )O 3 –46Pb(Mg 1/3 Nb 2/3 )O 3 –30PbTiO 3 (PIN–PMN–PT) crystal poled and depoled was measured from room temperature to 200 °C at various frequencies. The poled sample exhibits transitions from th…
Percolative BaTiO 3 /multiwalled carbon nanotube (MWNT) composite thick films were developed using an aerosol deposition (AD) process at room temperature. Well-dispersed mixed powders with various volume ratios were utilized as the starting powders for AD, and dense BaTiO 3 /MWNT composite thick films were successfull…
The Co38Ni33Al29 alloy in both powder and bulk state was investigated in the presented study using neutron diraction on E9 high resolution powder diractometer at HZB (BER II). The reverse martensitic phase transformation from the tetragonal martensitic phase into the cubic austenitic phase was observed with the phase…
Polymer outdoor insulators have been developed and used on transmission lines and power distribution network. A polymeric insulating material that is widely used is epoxy resin and silicone rubber. Each material has its own advantages and disadvantages. Generally, polymeric materials have dielectric properties better…
Abstract A series of rare‐earth luminescent complexes {[Eu(pta)(H 2 O) 3 ]·H 2 O} n ( 1 , H 3 pta=pyridine‐2,4,6‐tricarboxylic acid) and {[Eu x Y (1− x ) (pta)(H 2 O) 3 ]·H 2 O} n ( 2 – 10 ) have been synthesized. Complexes 1 and 8 were determined by single‐crystal X‐ray diffraction, while other complexes were charact…
Recent years have witnessed a significant research interest in Floquet-Bloch analysis for determining the homogenized permittivity and permeability of metamaterials consisting of periodic structures. This work investigates fundamental properties of the Floquet-Bloch space harmonics in a 1-dimensional magneto-dielectri…
Rubber toughened polyester-kenaf composite were prepared by adding various percentage of kenaf fiber in unsaturated polyester resin and subsequently cross linked using methyl ethyl ketone peroxide and accelerator cobalt octanoate 1 %. 3 per hundred rubbers (phr) of liquid natural rubber (LNR) were also added to modify…
We designed and simulated a three-core nonlinear directional coupler (TNLDC) dark soliton switch. We have optimized the optical properties of chalcogenide glasses such as their high nonlinear refractive index and negative group velocity dispersion and designed a switch having a length of 7 cm and an ultra-fast pulse w…
A relation is established between the content of meso phase in high-temperature pitch and the condensation of coal tar used for pitch production. The influence of the meso-phase content in the high-temperature pitch on the quality of the artificial graphite produced is demonstrated.
Hydrogen concentration in carbon materials, in particular, carbon nanotubes, grows with cycles of sorption. Hydrogen concentration at the room temperature is more than five times less than that at the low temperature. The maximum hydrogen sorption capacity of carbon materials is 4.5 wt% at high pressure and low temper…
This paper deals with two topics about the measurement of zero sequence impedances in 3-phase core-type transformers. The first topic is a comparison of 3 methods to perform the measurement in a 3-phase winding: a) parallel connection of windings; b) series connection of windings; and c) measurement of elements of the…
Negative sequence currents are induced in the rotor of a turbine generator when there is imbalance in the three phase armature currents. By adopting surface impedance boundary conditions to represent the rotor steel, three dimensional finite element methods can be used to determine the effect of barriers to the curren…
Abstract An adapted form of vapor transport is used for the preparation of zinc oxide (ZnO) nanostructures. Control of substrate, partial pressure, temperature, and deposition time enable the synthesis of seven ZnO samples, each with different morphology. Characterization by X‐ray diffraction (XRD), photoluminescence…
Direct golden orange dye molecules were used as a dispersing agent to produce suspensions of single-walled carbon nanotubes (SWCNTs) in water. Uniform, thin film networks were fabricated by vacuum filtration using different concentrations of SWCNT and transferred subsequently to glass substrates. The dispersion effici…