Materials Literature
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Electrical treeing is a long-term degradation mechanism in polymeric insulation, which can lead to electrical failure of HV insulation systems. The rate at which trees grow across the insulation depends on the PD activity occurring within them and hence the detection of the onset of electrical treeing could be establi…
A new model for investigating the growth of electrical tree in solid insulation using hyperbolic needle-to-plane gaps is used. Accurate computation of electric field is a pre-requisite for calculating the growth of electrical tree. The electric field distribution is obtained from Laplace's equation by treating the tre…
Abstract The influence of Fe acceptor and Fe – F acceptor – donor co-doping on the dielectric response of screen-printed Ba 0.6 Sr 0.4 TiO 3 thick-films on alumina substrates has been investigated. The Ba 0.6 Sr 0.4 TiO 3 powders were synthesized by freeze-drying of sols. Permittivity, dielectric loss, and tunability…
The effects of thermomechanical cycling on the shape memory behavior and transformation temperatures of a Ni50.2Ti49.8 alloy under a constant applied stress of 300 MPa were investigated. It is believed that thermomechanical cycling induces defects such as dislocations, which evidently affect the shape memory behavior…
In this study, low-toxic fullerene-based nanocationite particles (adducts of porphyrin with cyclohexyl fullerene C 60 ) designated for targeted delivery of the paramagnetic stable magnesium isotope to heart muscle is reported for the first time; these particles exhibit a sharp clinical effect of 80% recovery from tiss…
We present chemical state information on contamination-free Ge2Sb2Te5 thin film using high-resolution x-ray photoelectron spectroscopy (HRXPS) and the corresponding theoretical understanding of the chemical states, on both amorphous and metastable phases, illuminating the phase-change mechanism of the system. HRXPS da…
The microstructure of a Cu-Zn alloy treated under different high pressures was investigated by means of metallographic, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD), and the hardness of the Cu-Zn alloy was also measured. The results show that the α phase with a…
The species composition of diatoms in ten sphagnum bogs of the Volga Upland (Penzenskaya oblast) was studied. A systematic and ecologo-geographical analysis of flora was performed. A great number of algae were found (291 species and intraspecific taxon) that differ in specific ecological features and frequency of occu…
A simulation model of concentrated colloidal rod-like nanoparticles is developed. As the governing equation of motion of a nanoparticle, the Langevine equation with external force is used. The external force includes capillary force, contact force, electrostatic force, van der Waals force, and elastic force which occu…
Four Fe–Cr–C hardfacing alloys with carbon contents of 3˙34–6˙5% were studied. The orientation of primary carbides in the microstructures of hardfacing layers produced by arc surfacing was investigated under controlled cooling conditions. Carbon content and cooling conditions were found to play an important role in de…
This paper describes a numerical and experimental investigation in support of the ARIES-CS divertor design, which selected a modular, helium-cooled, T-tube design that can accommodate a peak heat load of 10 MW/m2. Numerical analyses were carried out using the FLUENT computational fluid dynamics software package to eva…
Ferroresonance is a nonlinear dynamic electrical phenomenon in a power system. It may occur in ungrounded three-phase lines at transformer banks on no-load due to mal - functioning of switching devices (one pole closing at first). A laboratory set-up is developed with core-type transformers and power capacitors simula…
Polymers are extensively used as insulating material in high voltage devices, such as underground power cables, power capacitors and transformers. During normal operation the polymeric insulation of a power device is not only subjected to electrical stresses, but could also be subjected to thermal, mechanical and envi…
Predicting the properties of a material from knowledge of the internal microstructures is attracting significant interest in the fields of materials design and engineering. The most commonly used expression, known as Hall-Petch Relationship (HPR), reports on the relationship between the flow stress and the average gra…
To evaluate the component life in a spent nuclear fuel reprocessing plant, a large-scale mock-up test apparatus of a reduced pressurized thermosiphon evaporator was constructed, and the corrosion mechanism of a heat transfer tube made of ultralow carbon type 304 stainless steel in boiling nitric acid solution was stud…
Abstract The crystal structure of rutile-type magnesium deuteride, α -MgD 2 , has been studied by in situ neutron powder diffraction at room temperature and pressures up to 9.3 GPa. The bulk modulus B 0 = 49(2) GPa is about half, the linear compressibilities (0.0063/GPa along a and 0.0041/GPa along c ) are about twice…
The paper addresses the chemical purification behavior of detonation nanodiamond soot in the case of using a dilute nitric acid under pressure. The optimal process is found to proceed at 230–240°C, 7–8 MPa, with HNO 3 excess of 200–300% of stoichiometry.
Abstract The inherent brittleness of ceramics led to a probabilistic approach for designing with ceramic materials. For tackling this issue, numerous research projects led to the generation and continuous development of the weakest link postprocessor STAU over the last twenty years. Compared to other similar tools, ST…
The results of environmental degradation of poly(D,L-lactide) (PLA), unmodified or modified with amorphous poly[(R,S)-3-hydroxybutyrate] (a-PHB), in the compost pile with activated sludge or in the Baltic Sea water were presented. The changes of characteristic parameters of both these environments were monitored durin…
Nano-sized ZnO powder was prepared by "solution-combustion method (SCM)." The ZnO powder using Zn(OH)2 and glycine as an oxidant and a fuel (F/O = 0.8), showed good powder characteristics, such as average grain size of 30 nm and the specific surface area of 120 m2/g. and it was used as a semiconductor photocatalyst to…