The paper discusses a theoretical model for the kinetics of the process of lipid peroxidation, which takes into account the effect of the synergy of vitamins E and C. Approximations are analyzed that make it possible to simplify the model system, taking into account the peculiarities of the process of lipid peroxidation. The resulting model is minimal and adequately describes the process of lipid peroxidation at stages significant for the effective control of this process as a whole.

The paper presents a study of the electrodeposition of binary alloys CoMo, CoRe and a ternary alloy CoMoRe from the citrate electrolyte (pH 3.5) depending on the presence of a constant magnetic field and the direction of the magnetic induction vector relative to the surface of the working electrode. It is shown that the use of magnetoelectrolysis makes it possible to significantly increase the current efficiency of all studied alloys, especially the ternary CoMoRe alloy. The modeling of the forces acting in the liquid and on the bubbles of hydrogen released during the reaction in a constant magnetic field was carried out, and it was shown that the creation of convective flows due to the magnetohydrodynamic effect in the solution is not the only and determining factor; in the case of intense outgassing, the ratio of forces varies depending on the size of the bubbles: the conductive force and the Archimedes buoyancy force are the largest for large bubbles (about 100 µm), and the gradient magnetic force is for bubbles (less than 1 µm).

The paper discusses a possibility of increasing the wear and corrosion resistance of a low carbon steel surface after cathodic plasma electrolytic boronitrocarburising in a solution of boric acid, glycerin, and ammonium chloride, with the subsequent anodic plasma electrolytic polishing in an ammonium sulfate solution due to the formation of a modified structure consisting of a dense oxide layer and a diffusion layer below it, which contains up to 0.87% carbon, 0.80% nitrogen, and 0.87% boron upon reaching microhardness up to 970±20 HV. The competitive influence of the surface erosion under the action of discharges and high-temperature oxidation on the morphology and roughness of the surface is revealed. A positive effect of reducing the surface roughness during the formation of a dense oxide layer on the surface and a hardened diffusion layer under it on reducing the friction coefficient and mass wear, as well as reducing the roughness and additional oxidation of the surface during polishing on reducing the corrosion current density, has been established.

The results are given of approximate calculations of the relative permittivity er of conductive unmagnetic materials (metals and alloys) for a special case when the of conductivity and displacement currents are equal in a homogeneous unmagnetic medium. The above mentioned materials are widely used in the electric power engineering and high-voltage pulse engineering in conditions when alternating (pulse) electric currents and electromagnetic fields (EMFs) with different peak-temporal parameters are acting on them. It is demonstrated that in the studied case the examined materials for low frequencies f0 of the current and EMF (at the frequencies about 102 Hz) within the range of very long electromagnetic waves (EW) are characterized by very high values of the electrophysical parameter er (about 1015). For the very high frequencies f0 of the current and EMFs (at the frequencies about 5?1013 Hz) from the range of infrared radiation the indicated conducting materials are characterized by the er values of the order of (102–104) and according to the electro-physical parameter er they will approach to solid dielectrics and ferroelectrics.

Nonlinear interaction of capillary waves for the first azimuthal modes of an elliptical jet in an electric cross-section field is examined by the product of two independent small parameters. The interaction itself arises due to the ellipticity of the section perpendicular to the jet. Three azimuth modes participate in the interaction: either even or odd ones. When compared with a jet in a radial electrostatic field, the stability of the jet in a perpendicular uniform electrostatic field is reduced. It turned out that the characteristic time for implementing instability decreases with an increase in the initial amplitudes of the interacting modes and with an increase in the intensity of the external electrostatic field, and it also depends on the value of the wave number.

The paper presents the results of studies of the electrical and magnetic properties of an inhomogeneous percolated medium based on the theory of percolation. The application of this theory has a wide and varied range. Examples include hopping conductivity in semiconductors, properties of porous materials, and so on. It was found that, with approaching the percolation threshold pc = 0.35, the resistivity decreases, and the electrical conductivity increases accordingly. An increasing number of individual ferromagnetic nanogranules in (p)–Fe2O3–(1–p)MBT composites merge with the formation of individual Fe2O3 clusters in the bentonite matrix, which combine to form a continuous network of clusters. This is due to the fact that the resistivity ? of the composite is mainly determined by the magnetic component of the latter.

This publication provides a brief overview of the results of recent research works by the author in the field of power electronics, carried out and published mainly in 2019–2021, and awarded with the Premium “Boris Lazarenko” of the Academy of Sciences of Moldova in the field of engineering. The methodological basis of those investigations is an original alternative method of the synchronous multi-zone space-vector modulation of signals of voltage source inverters as the main workhorses of adjustable speed electric drives and renewable energy systems. Therefore, basic strategies, schemes, and algorithms of synchronous multi-zone modulation have been further developed, modernized, modified, and disseminated for the control of novel promising topologies of power conversion systems for variable speed drives and for photovoltaic installations. It is shown that the developed schemes and algorithms of the synchronous space-vector modulation applied for control of inverter-based systems provide continuous synchronization and symmetry of the basic voltage waveforms of systems during the whole control range. It provides minimization of even harmonics and undesirable subharmonics (of the fundamental frequency) in spectra of the basic voltages of systems, leading to reducing the losses in the systems and to increasing their efficiency. Based on a comparative analysis of the integral spectral characteristics of the phase voltage of the systems, recommendations are formulated for the rational choice of schemes and algorithms of the synchronous space-vector modulation for the relevant installations, depending on the modes of their operation.

This work deals with the influence of the parameters of the working fluid (hydrostatic pressure, temperature, electrical conductivity) and the geometry of the electrode system (the length of the interelectrode gap and the uninsulated part of the anode) on the pre-breakdown characteristics of an electric discharge in a liquid aqueous electrolyte (breakdown voltage and breakdown delay time) and the minimum charging voltage, which provides a stable high-voltage breakdown of the interelectrode gap. Studies have shown that an increase in the hydrostatic pressure leads to an increase in most of the studied characteristics. At the same time, an increase in the specific electrical conductivity and temperature was observed to lead to their decrease. At the same time, it was suggested that the effect of temperature on the pre-breakdown characteristics is associated with a change in the specific electrical conductivity of the working fluid during its heating. The data obtained showed no effect of the length of the interelectrode gap on the breakdown voltage and its breakdown delay time, as well as the minimum charging voltage. The results of the experimental studies made it possible to develop a criterion for determining the charging voltage, which provides a stable high-voltage breakdown of the water interelectrode gap. Its experimental verification has shown that it can be applied to the design of electric discharge equipment and to the choice of technological modes of operation in the specified range of parameters.