Materials Literature
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Abstract— The spatial distribution of impurity defect centers in Fe-doped chemical vapor deposited (CVD) ZnSe has been studied by two-photon confocal microscopy and scanning Fourier transform spectroscopy using an IR microscope. It has been shown that, as a result of doping with Fe, CVD ZnSe contains regions hundreds…
The main sources of radioactivity inside a typical nuclear power plant are analyzed. The paper presents the results of case study research of the environmental pollution near the Khmelnytskyi nuclear power plant in Ukraine. Concentrations of radionuclides in air emissions are measured: the largest concentrations are f…
Electrical tomography has been used to monitor the processes of flame ignition, fluctuation and extinction. To obtain more quantitative and key information of the flame from images of conductivity and permittivity distributions, a calibration method is necessary for studies on different combustors. In this paper, the…
Cu-Cu bond is a prefer solution for shrinking interconnect pitch as it offered lower interconnect resistance with no intermetallic compound risk. Major challenge in Cu-Cu bond is the formation of copper oxide and also the long thermal process. Several approaches had been proposed in the industry to overcome the challe…
The intermetallic compounds growth at the interface between the eutectic solder Bi58Sn42 and the copper soldering pad was examined in dependence on the temperature profile selection that was expressed by a heating factor (combined influence of time and temperature above the melting point of the solder alloy). Eight te…
A new 3D ultra-wideband high selective bandpass frequency selective surface is presented in this paper. Interleaved subwavelength metal frames produce multiple transmission poles, leading to a sharp roll-offs at the edge of passband. The simulation results show that the FSS can achieve 11.8GHz band-width, covering the…
In this study, hydroxyapatite was produced via mechanochemical method using the sea snail Turritella terebra as a calcium source at 1200 C followed by sintering. FT-IR, SEM/EDX, BET, XRD, ICP-OES analyses were applied for complete characterization. Biodegradability test in tris-buffer solution and bioactivity tests we…
This paper presents the aggregate model of single phase induction motors used in residential heat pump loads. The equivalent circuit parameters of the aggregated motor model are derived by performing no load and locked rotor tests. The proposed model captures the loads aggregated behavior (in steady state and transien…
Abstract—Nanotribological tests via atomic force microscopy were optimized by recording the lateral interaction forces between the probe tip and the sample surface in the contact mode. In the case of thin film metal materials, the technique enabled us to determine independently the sliding force and the static frictio…
Orbital angular momentum (OAM), which is inherently possessed by the electromagnetic (EM) beams, bridges a new way for multiple access using multiple orthogonal OAM-modes in wireless communications. Uniform circular array (UCA), as a convenient antenna structure for supporting the transmission and reception of OAM bas…
First representatives of a novel class of compounds containing an electron-accepting hydrazonocyclopentadiene moiety, π-conjugated phenylene spacer, and electron-donating triphenylamine moiety have been synthesized. Investigation of their optical, electrochemical and photovoltaic properties revealed a high potential o…
Abstract Phase transformations occurring in various metals like steel, titanium and super alloysis integrated and presented in this paper. In steels, the microalloying with Nb and Nb-Mo decrease in transformation temperature indicates the acceleration of transformation kineticsin turn which affect the microstructure a…
This paper proposes a coalitional model predictive control algorithm with feasibility guarantees for systems with bounded additive uncertainties. This formulation, suitable for sub-systems coupled through the inputs, assumes the coupling variables as disturbances and ensures a robust consensus with minimum information…
Abstract The structure and properties of Ti–B–N, Ti–Cr–B–N and Ti–Si–B–C–N coatings, deposited by magnetron sputtering are investigated. Various approaches to increasing adhesion strength are considered: deposition of sublayers, application of a high bias voltage at the beginning of deposition, preliminary ion etching…
Abstract The phase composition, the structure of cores and shells, and the dependences of the shell thickness on the fabrication technique were determined by Mössbauer spectroscopy for core/shell Fe3O4/γ-Fe2O3 magnetic nanoparticles (MNPs) with Fe3O4 cores of a fixed size (8 nm) and γ-Fe2O3 shells of a varying thickne…
Abstract The size effect of small particles has been extensively studied from a theoretical as well as experimental point of view. However, the size-dependence of melting entropy and enthalpy of nanostructures has not been fully explored. In the current study, considering the effect induced by atomic packing factor of…
Abstract The main results of calculations of energy parameters performed by ab initio methods (DFT) for steps of the mechanism of Fischer–Tropsch synthesis involving cobalt- and iron-containing catalytic systems which have been published over the last decade and a half are analyzed. Primary attention is paid to the re…
Abstract The fuel and energy complex is the basis for the development of all sectors of the Russian economy. Its most important element is trunk pipeline system for the transport of gas, oil and their products. The main gas pipelines with cathodic protection, are exposed to the impact of ground electrolytes and tensil…
We report Shubnikov–de Haas (SdH) oscillations of a three-dimensional (3D) Dirac semimetal candidate of layered material ZrTe5 single crystals through contactless electron spin resonance (ESR) measurements with the magnetic field up to 1.4 T. The ESR signals manifest remarkably anisotropic characteristics with respect…
Flake graphite iron, compacted graphite iron and spheroidal graphite iron with various tensile strengths were cast. They were selected and grouped according to roughly the same tensile strength, and then the main cutting force in each group was measured and compared. The microstructures of different cast irons were ch…