Browsing by Author "Kharchenko, Aleksandr V."

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Analysis of Design of Passenger Cars Bogies for High speed Movement
(The Silesian University of Technology, Poland, 2014) Kharchenko, Aleksandr V.
EN: This paper gives an overview of the existing models of passenger cars bogies for high-speed movement, both Ukrainian production and production of other countries. As a result of this analysis it were determined the main tendencies to improve the design of running parts of passenger cars for high-speed movement. Also it was made a classification of bogies of passenger cars on different criteria.
Synthesis of N,N'-(((Hydrazine-1,2- Dicarbonothioyl)Bis(Azanediyl))Bis(2,2,2-Trichloroethane-1,1- Diyl)) Carboxamides and Their Cyclisation Into N,N'-(((1,3,4-Thiadiazole-2,5- Diyl)Bis(Azanediyl))Bis(2,2,2-Trichloroethane-1,1-Diyl))Carboxamides
(Oles Honchar Dnipro National University, Dnipro, 2025) Pavlova, Valeriia V.; Zadorozhnii, Pavlo V.; Kiselev, Vadym V.; Romanenko, Pavlo V.; Okhtina, Oxana V.; Kharchenko, Aleksandr V.
ENG: 1,3,4-Thiadiazole derivatives are widely used in science and technology as biologically active compounds, components of polymer and rubber compositions, dyes and varnishes, catalysts, as well as materials for microelectronics and nanotechnology. This work presents the synthesis of new bis-amidoalkylated derivatives of 2,5-diamino-1,3,4-thiadiazole. The preparation of these compounds is based on the reaction of oxidative dehydrosulfonation of N,N'-(((hydrazine-1,2-dicarbonothioyl)bis(azanediyl))bis(2,2,2-trichloroethane-1,1- diyl))carboxamides using a mixture of iodine and triethylamine in DMF. The reaction was carried out at room temperature for two hours. This method yields target products in the range of 63–92 %. The advantage of the method is the absence of the need for expensive or hard-to-find reagents. NMR ¹H and ¹³C spectroscopy confirmed the structure of the synthesized compounds. The 1H NMR spectra of synthesized 1,3,4-thiadiazoles are distinguished by the presence of doublet signals corresponding to two NH protons observed in the 9.53–6.69 ppm range, along with a doublet of doublets assigned to the CH proton of the alkylamide fragment appearing at 6.77– 6.69 ppm. The 13C NMR spectra exhibit characteristic resonances of the C=O carbon at 168.8–164.7 ppm and the C=N carbon of the thiadiazole ring at 158.9–158.6 ppm. Furthermore, characteristics signals attributed to the CCl3_ moiety and the CH carbon of the alkylamide fragment are observed at 101.5–101.2 and 70.0–69.4 ppm respectively.
Usage of Quaternionic Matrices to Define Inertia Moments of Wheelset Taking Into Account Manufacturing and Assembly Errors
(2011) Kharchenko, Aleksandr V.; Kravets, Tamila V.
EN: It is given a computational algorithm of inertia matrix of wheelset that take into account manufacturing and assembly errors. An algorithm is based on quaternionic matrices. These matrices are made using Rodriguez-Hamilton parameters that take into account misalignments of symmetry axes and shifts of constructions in allowable limits.