Materials Literature
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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…
Plastic deformation of extruded AZ91 magnesium alloy was investigated at various strain rates and in a temperature range of 360420 C. Samples exhibiting superplastic behaviour were prepared with dierent thermo-mechanical treatments. Microstructure of samples was observed by light and scanning electron microscopy. The…
Discussion of the austenitesingle-variant martensite interfaces in CuAlNi alloy is performed in the frame of a topological model of martensite interfaces. This model takes into account admissible defects lying in the interface. The results are compared with the experimental data obtained on the foils of CuAlNi alloys…
The PD behaviour of so-called basic test arrangements as for corona discharge or other discharge sources seems to be well known from the physical point of view. On the other hand the measurement results and, in the same manner, their identification and interpretation can be different, because this is depending on the…
This paper deals with continuous monitoring of components of a 400 kV XLPE cable system placed in an underground tunnel in South London. An advance concept to assess and monitor the condition of the insulation of cable system is described. Partial discharges are continuously monitored at all joints and terminations an…
This paper deals with effect of excitation current waveform on PD induced electromagnetic wave propagation and attenuation in straight 154 kV GIS model tank with epoxy spacers. An attempt was made to determine a standard wave shape of experimentally obtained EM wave for the simulated ones obtained by changing the rise…
Various concentrations of copper were embedded into silica matrix to xerogel forms using copper source Cu(NO3)2∙3H2O. The xerogel samples were prepared by hydrolysis and condensation of Tetraethyl Ortho-Silicate (TEOS) with determination of new molar ratio of the components by the sol-gel method. After ambient drying,…