Materials Literature
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Abstract The solid–liquid equilibria (SLE) in the ternary nicotinic acid + ammonium sulfate + water system were experimentally studied at T = 298.15, 323.15, and 348.15 K under atmospheric pressure by an isothermal equilibrium method. Three isothermal phase diagrams of the system were established based on the measured…
Abstract Plasmonic enhancement of the photoluminescence in hybrid structures with SiGe quantum dots and Ag nanoislands was found. Ag nanoislands grown on the top of the multilayer structures with SiGe quantum dots (QDs) support a surface plasmon resonance that can be tuned to the QD emission wavelength by changing of…
Abstract Circular dichroism (CD) spectra of liquid crystalline dispersions formed as a result of phase exclusion of double-stranded DNA molecules from aqueous-salt-poly(ethylene glycol)-containing solutions were studied at room temperature and under heating. Based on the CD spectra, it is possible to distinguish dispe…
Abstract In previous papers, the author has shown that the polyhedral structures of fullerene type are widespread in the living and mineral worlds. They are most clearly manifested in the capsids of icosahedral viruses, the geometry of which has been well studied. This article demonstrates that the nomenclature, class…
Cordierite composed of an alumina-silica-magnesia compound has a low coefficient of thermal expansion(CTE) and excellent thermal shock resistance. It also has a low dielectric constant and high electrical insulation. However, due to low mechanical strength, it is limited for use in a ceramic heater. In this study, ZrO…
Abstract It is shown that damages accumulating in a rotor steel after more than 20 years in service under creep conditions at high temperatures reveal themselves in the change of acoustic emission (AE) parameters as compared with the initial structural state. The formation of clusters of AE activity is observed in zon…
This work deals with thermal design of permanent magnet synchronous motor (PMSM). The designed motor is the in-wheel traction motor for automotive. The motor consist of an external rotor and inner stator with water cooling system. The thermal calculation is based on the simplified lumped parameters thermal model and i…
Germanium is an important semiconductor having abundant phases of scientific interest. In this work, we studied the structural, electronic, vibrational, elastic and thermal conductivity properties of a tetragonal germanium via first-principles calculations. The results indicate that it is dynamically stable and there…
Phase-change memory (PCM) is the most mature candidate technology to be used in in-memory computing systems. For being able to experiment with large-scale PCM configurations, we developed an accurate and precise hardware PCM cell model that emulates the basic intrinsic impairments of the PCM technology, and we used it…
Abstract Structural, elastic, and magnetic properties of cobaltites DyBaCo4O7 + x produced by various technologies and distinguished by oxygen excess x are experimentally studied. It was found that rhombic distortion of the crystal structure of annealed stoichiometric samples with x = 0 results in frustration removal…
In the present paper we have used Scanning Electronic Microscopy (SEM) under vacuum conditions to show the influence of aging at high temperature and e-beam energy on the trapped charge in XLPE insulation. The XLPE samples are modeled and aged at 140°C. Unaged and aged samples are charged with electron beam irradiatio…
Abstract We have hypothesized that products of oxygen biotransformation by a microbial electron transport chain, for example, superoxide anion and the product of its disproportionation, hydrogen peroxide, play a key role in aerobic biocorrosion. The goal of the present work was to evaluate the role of superoxide anion…
The processes of electric charge transfer (conductivity) and mass transfer (diffusion) in La1 ‒ ySryF3 – y superionic conductors are determined by mobile fluorine ions. The fluorine random-diffusion coefficients Dσ have been calculated from experimental data on the ionic conductivity σdc for La1 ‒ ySryF3 – y single cr…
An electro-magnetic damping device, consisting of a pot-core with a permanent magnet in the center with a coil wound on it and a ferromagnetic yoke is analyzed in a simplified, linearised form. Experimental results indicate resonance peak attenuation and shift to a lower frequency in respect to a sole mechanical oscil…
Recently, new strain-gauge sensors based on magnetic tunnel junctions (MTJs) have attracted attention because they are promising for detecting extremely small strains. To further enhance the strain sensitivity of these spintronic strain-gauge sensors (Spin-SGSs) and obtain a linear response that is suitable for MEMS a…
We investigate the reduction of SnO2 and the generation of syngas(H2, CO) using methane(CH4) and hydrogen(H2) or a mixed gas of methane and hydrogen as a reducing gas. When methane is used as a reducing gas, carbon is formed by the decomposition of methane on the reduced Sn surface, and the amount of generated carbon…
Magnetization characteristics play a design significant role, implementation and switched reluctance motors SRMs performance that are considered fault tolerant motors. The first objective in modelling of SRM is to provide a high accuracy and robust operation through the complete speed and torque range. This paper pres…
Microwave imaging based on programmable metasurface with a single sensor at single frequency has been demonstrated to be remarkably advantageous to other conventional imaging techniques due to the high-speed-data-acquisition, the low cost hardware, and the non-frequency dispersion. In this work, we establish the ambig…
We propose a modified homogenization model by considering fiber reinforced composites with the random fluctuation microstructure in practical manufacturing craft. Several unknown factors are introduced in the proposed homogenization model to describe the behaviors of random fluctuation. Three infinite composite sheets…
Abstract The results of an investigation of the chemical composition, structure, topography, and mechanical properties of surface layers of armco-iron after implantation of nitrogen ions under various conditions are given. Using X-ray electron spectroscopy, the implanted nitrogen distribution profiles are determined a…