The features of the deviation of the potential of a de-energized circuit at the semiconductor-electrolyte contact, where cadmium and zinc sulfides are used as semiconductor materials, are considered. Models of equivalent electrical circuits explaining the observed phenomena are proposed. Examples of devices implemented on the base of the results of the conducted research are given.

Mathematical modeling of the electrohydraulic sheet metal stamping process using discharge chambers with a conical cavity was carried out. The influence of the parameters of the conical cavity of the discharge chamber on the plastic deformation energy of the plate and the shape of its deflection was investigated. It was determined that the height of the cone, a small radius of its upper base, and the location of the discharge channel near the upper base increase the plastic deformation energy of the plate to the greatest extent.

Experimental study of the chromium-nickel steel Cr18Ni10 anodic dissolution in a nitrate solution with electrical conductivity 0.15 S/cm in a pulse – galvanostatic mode at pulse durations 20–100 µs and current densities 0.01–100 A/cm2, with a change in the duty cycle 10–100% (direct current) at various hydrodynamic conditions and control the surface temperature, that the results obtained are consistent with the hypothesis that the process proceeds through the formation of oxide films of a semiconductor nature with a different type of conductivity (a film containing point defects, Point Defect Model, PDM). Under stationary conditions of the existence of PDM-II, the rate of its electrochemical formation is compensates by the rate of its chemical limiting value of the weight loss per unit of a passed charge (0.16–0.18 mg/C) (takes place under pulse conditions), which corresponds to a current efficiency close to 100% based on the highest degree of oxidation of the steel components.

The methodology, technique, and results of studies of the formation of films on the glass surface during laser irradiation of water solutions of copper sulfate with radiation are presented. The nanosecond radiation of an yttrium-aluminum garnet laser with a generation wavelength ? = 1.06 µm was used. Solutions with different concentrations of copper sulfate were applied. The structure of the films obtained in this case was compared with the structure of the films obtained as a result of drying solutions without exposure to laser radiation. The resulting films have both ordered and disordered structures. The characteristic dimensions of the structural elements of the films are 0.5–10 µm. The transmission of films in the visible spectral region (400–800 nm) was studied. In general, the resulting films are transparent in this area. Their transmission practically does not depend on the wavelength, but is different for different concentrations of the used solutions of copper sulfate.

The paper presents the results of experimental studies of the mass value of electrode (anode) erosion during a high-voltage electric discharge in a liquid. The results obtained made it possible to determine the influence of technological parameters and operating conditions of high-voltage electric discharge installations on the mass erosion of an anode. It is noted that with an increase in the specific electrical conductivity of the working fluid and in the length of the interelectrode gap, a decrease in the value of the mass erosion of the anode is observed. Comparison of mass erosion of anodes made of copper, steel, and aluminum showed that among them the steel anode has the highest erosion resistance during an electric discharge in water. Based on the results of the performed experimental studies, an empirical technique was developed that allows to estimate the mass erosion of the anode in one electric discharge in water.

The efficiency of the electrohydrodynamic (EHD) cooling and thermostating systems of electronic and electrical devices is investigated. A design of electroconvective cooling of an X-ray generator is proposed, the effectiveness of which is confirmed on laboratory models and full-scale samples. The anode temperature was reduced by a factor of two, the duration of the emitter operation increased, the reliability of the device improved. Various methods of cooling a high-voltage transformer are presented allowing to increase the specific power, reduce the weigh, size parameters, and temperature of the coolant, augment the resource. Studies have been conducted to establish the possibility of thermostating the heat-emitting element (block) by EHD methods when both external and internal conditions change. The design of an EHD thermostat with an automatic thermal stabilization system has been developed and tested (the temperature is maintained with an accuracy of ± 0.05 ??). A frame with an EHD liquid circuit and an EHD thermostat has been designed, which allows to significantly reduce longitudinal temperature differences and its deformation. The high efficiency of EHD cooling methods is shown by an example of a block of light-emitting diodes, small elements and components of electronic equipment, the use of electrodes – wires with a perforated insulating coating when cooling flat heat-emitting surfaces; a sevenfold increase in the heat transfer coefficient is achieved

To stabilize the dynamic layer of cellulose acetate (CA) and polystyrene (PS) membranes, the membrane was exposed to UV radiation using a laboratory setup in atmospheric air. As a base for dynamic membranes, a micro-filtration membrane made of nylon-66 and a membrane made of polytetrafluoroethylene (PTFE) grade MFFC-3G were used. Dynamic membranes PTFE-CA, PTFE-PSd nylon-CA, nylon-PS were obtained by forming a semi-permeable layer on the surface of a porous base from suspended microparticles of PS or CA present in a filtered aqueous solution of acetone with sizes of 81–504 nm and 42–130 nm, respectively, in a dynamic equilibrium with the solution. After obtaining the membranes, the surface was treated for 10 minutes with UV radiation in the wavelength range of 280–320 nm, with a UV radiation power of 6 W. Stabilization of dynamic membranes by UV radiation made it possible to increase the specific productivity of CA membranes 10 times and of PS by 1.5 times, while reducing the retention capacity of those membranes in terms of oil products by 9–17%. UV treatment of polymeric membranes can be used to increase the specific productivity and stabilization of dynamic membranes with a PS surface layer

The separation of water-oil emulsion with cellulose membranes modified with a unipolar corona discharge at voltage of 5–25 kV and time of 1–5 min was investigated. The results of the X-ray diffraction analysis and of the electrostatic field parameters measurements showed a decrease in crystallinity from 0.29 to 0.27 and the formation of positive charges on the surface of the sample, while the formation of a double electric layer according to dielectric spectrometry data was not detected. During the separation of the model water-oil emulsions, an increase in efficiency was revealed as 80% to 98% and the separation productivity from 15 dm³/(m²?h) to 35 dm³/(m²?h) after treatment in the field of a unipolar corona discharge of cellulose acetate membranes, which is explained by a change in the supramolecular and chemical structure of the latter.

The separation of water-oil emulsion with cellulose membranes modified with a unipolar corona discharge at voltage of 5–25 kV and time of 1–5 min was investigated. The results of the X-ray diffraction analysis and of the electrostatic field parameters measurements showed a decrease in crystallinity from 0.29 to 0.27 and the formation of positive charges on the surface of the sample, while the formation of a double electric layer according to dielectric spectrometry data was not detected. During the separation of the model water-oil emulsions, an increase in efficiency was revealed as 80% to 98% and the separation productivity from 15 dm³/(m²?h) to 35 dm³/(m²?h) after treatment in the field of a unipolar corona discharge of cellulose acetate membranes, which is explained by a change in the supramolecular and chemical structure of the latter.