ElAr :: Перегляд за автором "Glukhov, O. V."

Перегляд за автором "Glukhov, O. V."

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Creating of a remote-presence robot based on the development board Texas Instruments to monitor the status of infected patients
(2022) Chekubasheva, V. A.; Kravchuk, O. A.; Hlukhova, H.; Glukhov, O. V.
Statistics show that many infections of employees in medical institutions are associated with direct contact with patients. Furthermore, the deterioration of the patient’s condition in the intervals between doctor’s rounds was observed. Therefore, control and reduction of morbidity through introducing new monitoring methods without the direct involvement of human resources remains an urgent issue. This paper considers an alternative method for monitoring the state of infectious patients undergoing treatment. In this article, we have described the use of standard elements for scanning the medical state of people for the timely detection of pathologies with the implementation of instant notification of the attending physician. Based on the functionality of the Texas Instruments Robotics System Kit (TI-RLSK) developer board and additional sensors, an autonomous robot scanner was created. The considered embodiment of the model systemizes the provided recording recognition of a specific patient with the parameters of the health state in a database. In addition, the navigating system with an updated real-time map of the area enables the robot to deliver medicine to patients.
Creation of a Prototype of a Multi-function Remote Presence Robot for Physical Research in Electronics
(2021) Beresnev, V. M.; Chekubasheva, V. A.; Glukhov, O. V.; Kravchuk, O. O.
The article presents methods for constructing and implementing an automated electronic system for collecting and analyzing information about various physical parameters of the environment under conditions of long-term continuous measurements. The system is based on microprocessor devices using wireless technologies with the implementation of the EKF SLAM algorithm for localizing places with an uneven distribution of environmental parameters to minimize pollution of cleanrooms. Also, it can then transmit signals through the operator's computer to the control elements of the room. Thus, the minimization of environmental factors for physical diseases and high-precision equipment is carried out, thereby extending its service life.
Hopping Conductivity Mechanism in Cd3As2 Films Prepared by Magnetron Sputtering
(2020) Glukhov, O. V.
Cadmium arsenide films on oxidized silicon substrates were obtained by RF magnetron sputtering. The structure and morphology of the surface were studied by atomic force microscopy (AFM) and Raman spectroscopy (RS). The Raman spectrum contains peaks characteristic for Cd3As2 films at 194, 249, and 303 cm − 1. The carrier mobility in the samples was 0.15-1.7·103 cm2V − 1s − 1 at concentrations of 0.7- 4.4·1019 cm − 3. It has been established that for the sample No 1 in the temperature range T  10-15 K, the variable-range hopping (VRH) conductivity mechanism according to the Mott law is implemented. This can be explained by the fact that a microscopic disorder becomes important for electron localization in this temperature region. This is due to a decrease in temperature or an increase in the degree of disorder. In this case, the jump becomes possible only inside the Mott energy band near the Fermi level. The charge transfer in sample No 2 at T  220-300 K is carried out by the VRH conductivity of the jump over localized states lying in a narrow energy band near the Fermi level. These states can be created by grain boundaries and dislocations. The relations between the values of the Coulomb gap Δ and the zone width of localized states W are consistent with the corresponding conduction mechanism.
Influence of the Angle of Inclination of the Plasma Flow of Carbone to the Substrate on the Electrical Capacitance and Morphology of the Surface of Carbon Coatings.
(2017) Glukhov, O. V.; Sudzhanskaya, I. V.; Poplavsky, A. I.; Goncharov, I. Yu.
Carbon film was obtained by pulsed vacuum-arc method on the silicon wafers. Method of impedance spectroscopy was obtained results change of electrical capacitance of parameters obtained carbon films. Morphology of surface produce by scanning probe microscopy methods was investigated. Determine correlation dependence between electrical capacity of carbon films and morphology surface against condition theirs obtainment. The explanation of the obtained results was proposed.
Influence of the Bias Potential and Working Gas Pressure on the Properties of the TiSiN/NbN Ion Plasma Multilayer Coating
(2022) Horokh, D. V.; Maksakova, O. V.; Klymenko, S. A.; Lytovchenko, S. V.; Beresnev, V. M.; Glukhov, O. V.
The phase composition, element distribution, and mechanical properties of the TiSiN/NbN(TiN) multilayer coatings obtained by vacuum arc deposition are anlyzed. The effect of the bias potential on the mechanical and tribological characteristics of the coatings is studied, and the adhesion strengths of the coatings to the substrate are measured. The results of X-ray diffraction stud ies of the coatings show that a two-fold increase in the bias potential leads to increases in all phase and structural parameters—in particular, lattice parameters, crystallite sizes, and microdeformation levels of the components of the coatings. The intensities of δ diffraction peaks of TiN and NbN indicate the presence of a strong (200) texture. Tribotechnical studies of the coatings have shown that they are erased during scratching, but their detachment from the substrate has not been recorded. This means that the coatings are worn by the cohesive mechanism associated with plastic deformation and the for mation of fatigue cracks in the coating volume. Different modes of coating formation correspond to different values of acoustic emission that occurs, depending on the conditions, in the loading zone.
Nanostructured Coatings Based on Amorphous Carbon and Gold Nanoparticles Obtained by the Pulsed Vacuum-arc Method
(2019) Glukhov, O. V.
Nanostructured coatings based on diamond-like carbon and gold-doped carbon with a thickness of 100- 300 nm were obtained by a pulsed vacuum-arc method on silicon substrates. The structure of the coatings was studied by high-resolution transmission electron microscopy, the elemental composition was studied by X-ray microanalysis. In addition, hardness, adhesive and tribological characteristics, the magnitude of internal stresses, as well as electrical conductivity and optical characteristics were also investigated. It was found that gold nanoparticles in the carbon matrix have a crystal structure and their size is about 5 nm. A change in the gold content from 1 to 25 % leads to a deterioration in the tribological properties of the coating, while the resistivity decreases from 920 to 0.06 mΩm. The technique proposed in this study for the doping of a diamond-like carbon coating with gold allows varying the resistivity and transmittance over a wide range while maintaining high wear resistance and low friction coefficient.
Production, Structure and Properties of Coatings Based on Al2O3 Obtained by Magnetron Method
(2020) Glukhov, O. V.
Al2O3 and Al2O3/ZrO2 multilayer coatings were deposited by the magnetron method by sputtering the corresponding metal targets in a mixture of oxygen and argon gases. The microstructure of the cross sections to determine the thickness and elemental composition of the obtained coatings was studied by transmission and scanning electron microscopy. The surface morphology of Al2O3 coating samples was studied by scanning probe microscopy. It is shown that the formed Al2O3 coating and the Al2O3/ZrO2 multilayer coating have a columnar structure with the columns oriented perpendicular to the surface. The columnar structure of multilayer coatings is not violated during the transition from layer to layer. The coating surface consists of globules with a diameter of about 20 nm. It was found that the Al2O3 coating has dielectric properties using the method of impedance spectrometry. Thus, it was shown that the magnetron method can be used to apply high-quality multilayer dielectric coatings, which can be used as thermal barrier coatings to protect the blades of high-temperature stages of aircraft engine turbines.
Structure and mechanical properties of multilayer coatings (TiAlCrY)N/ZrN
(2019) Novikov, V. Yu.; Beresnev, V. M.; Kolesnikov, D. A.; Ivanov, O. N.; Lytovchenko, S. V.; Stolbovoy, V. A.; Kolodiy, I. V.; Kozachenko, A. O.; Kovaleva, M. G.; Kritsyna, E. V.; Glukhov, O. V.
Multiperiodic nitride coatings (TiAlCrY)N/ZrN with different layer thicknesses are formed by vacuum-arc evaporation in a nitrogen atmosphere (0.2…0.6 Pa) of two targets, TiAlCrY and Zr. The targets were located along one straight line at equal distances from the perpendicular axis on which the substrates were placed. The rotation of the axis with the substrates was carried out either continuously or with a fixed delay at the evaporators. The duration of the process was chosen so that the total thickness of the coating (total thickness of the bilayers) was 10…11 μm. The effect of nitrogen pressure and modulation period on the structural-phase state, elemental composition, and mechanical properties of multilayer coatings has been studied. An increase in the partial pressure of nitrogen and, consequently, its content in the coating leads to an increase in hardness. Reducing the thickness of the layers in the coatings increases the adhesive strength of the coatings and does not have a significant effect on the microstresses in the coating.
Structure and Physicomechanical Properties of Superhard Milticomponent Multilayer (TiAlCrY/Zr)/(TiAlCrYN/ZrN) Coating with Double Modulation Period of the Structure
(2019) Novikov, V. Yu.; Beresnev, V. M.; Kolesnikov, D. A.; Ivanov, O. N.; Lytovchenko, S. V.; Glukhov, O. V.; Gorokh, D. V.; Kozachenko, A. O.; Krystyna, E. V.; Sirota, V. V.
Synthesis of Pure Hydroxyapatite by Ion Exchange Reaction.
(2019) Glukhov, O. V.
An ion-exchange reaction for the synthesis of hydroxyapatite (HAP) in a constant alkaline medium using preliminary dry homogenization is proposed in this work. Sodium hydrogen phosphate Na2HPO4, calcium chloride CaCl2 and calcium hydroxide Ca(OH)2 were chosen as precursors. When Na2HPO4 interacts with calcium salts in an alkaline medium, Na+ ions are replaced by Ca2+ ions. The CaCl2 salt was chosen as the source of Ca2+ ions, since in this case one of the reaction products is sodium chloride, which is subsequently easily washed out. The required pH of the medium was achieved by adding calcium hydroxide to the starting materials, which was also a source of Ca2+ ions. Heating in a water bath provided a constant influx of water molecules, which is necessary for the dissociation of the molecules of the substances involved in the reaction. In dry synthesis, it is rather difficult to obtain stoichiometric HAP due to the uneven distribution of ions in the reacting mixture. The chemical reaction in a humid environment can reduce the influence of this factor. It was assumed that since, in addition to HAP, the reaction products are water-soluble compounds, a slight change in the ratio of the starting components can be used to control the stoichiometry of HAP, as well as the ratio of the final reaction products. Additional products formed during the reaction were removed by washing the resulting powder with distilled water. The washed and dried HAP powder was annealed in an oven at T  700 °C. Studies carried out by methods of X-ray phase analysis, scanning electron and transmission microscopy showed that the material obtained is a singlephase hydroxyapatite powder with a Ca/P ratio close to 1.67. It was found that the particles of HAP powder obtained as a result of synthesis with subsequent washing have the shape of needles with a thickness of 10 to 40 nm and a length of 30 to 200 nm. Annealing of the powder at a temperature of 700 °C leads to agglomeration of particles, as well as to rounding of their shape.
(TiZr)N/(TiSi)N Maitilayer Nanostructured Coatings obtained by Vacuum Arc Deposition.
(2018) Lytovchenko, S. V.; Mazilin, B. A.; Beresnev, V. M.; Stolbovoy, V. A.; Kovalyova, M. G.; Kritsyna, E. V.; Kolodiy, I. V.; Glukhov, O. V.; Malikov, L. V.
The paper investigates the structure and properties of nanoscale multilayer coatings based on (TiZr)N and (TiSi)N produced by vacuum arc technique. Also, it provides an analysis of the impact of partial pressure of nitrogen on structural and phase state of coatings. The nitride phases are strongly textured, crystallographic planes (111) of most grains are oriented parallel to the surface. Dimensions of the coherent scattering regions and values of micro-distortions of the lattice have been calculated. The hardness of coatings reached 37.1 GPa, and the adhesion fracture load exceeds 150 N. The process technology ensures high uniformity of and a low defect rate in obtained coatings.
Tribotechnical Properties of (TiZr)N/(TiSi)N Multilayer Coatings with Nanometer Thickness.
(2019) Glukhov, O. V.
The tribotechnical characteristics of (TiZr)N/(TiSi)N nitride multilayer coatings obtained by the meth-od of vacuum-arc deposition at room temperature were investigated. The analysis of the influence of the deposition conditions on the mechanical and tribological properties of coatings with different modulation periods (total bilayer thickness) of this structure was carried out: in the 1st series  about 20.4 nm, in the 2nd series with  ≈ 43.9 nm, and in the 3d series of samples the coating was formed with a thickness of  ≈ 137 nm. The results of wear were investigated, and they indicate that multi-element nitride coatings wear out by abrasive mechanism. The intensity of wear in coatings with the number of layers 360 (period   20.4 nm) is 2 times lower than in coatings of 89 layers (period   137 nm). The values of the friction coefficient were 0.79-0.82 during tests. Coating hardness was HV0.05  37.6 GPa for the samples of series 1, HV0.05  31.2 GPa for the second series, and HV0.05  26.5 GPa for the samples of series 3.

Перегляд за автором "Glukhov, O. V."

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