Oles Gonchar Dnepropetrovsk National University

Dnipropetrovsk, Ukraine

Oles Gonchar Dnepropetrovsk National University

Dnipropetrovsk, Ukraine

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Hudramovich V.S.,Ukrainian Academy of Sciences | Hart E.L.,Oles Gonchar Dnepropetrovsk National University | Klimenko D.V.,Yangel Yuzhnoe State Design Office | Ryabokon S.A.,Ukrainian Academy of Sciences
Strength of Materials | Year: 2013

Analytical models have been constructed for the stress-strain determination by using projectioniterative schemes for implementation of the finite-element method for shell-type structures with rectangular openings under plastic deformation. The variation of opening parameters, quantity, and spacing allows one to study the formation and transformation of plastic strain zones in the course of loading for various deformation curves. Merging of the zones leads to a decrease in stiffness; this fact is used in predicting the load-carrying ability of shell-type structures with openings. © 2013 Springer Science+Business Media New York.


Nesterova E.Yu.,Oles Gonchar Dnepropetrovsk National University | Pugacheva A.S.,Oles Gonchar Dnepropetrovsk National University | Voevudsky M.V.,Ukrainian State University of Chemical Technology
Chemistry of Heterocyclic Compounds | Year: 2012

Under Curtius rearrangement conditions, 2,6-dimethyl-3,5-pyridinedicarboxylic acid azides form the corresponding isocyanates which react in situ with ammonia, primary and secondary amines to form mono-, di-, and trisubstituted ureas. The reaction of the 5-ethoxycarbonyl-2,6-dimethylnicotinic acid azide with imidazole under these conditions gave symmetrical N,N'-bis[5-(ethoxycarbonyl)-2,6-di-methylpyridin-3-yl]ureas. © 2012 Springer Science+Business Media New York.


Plakhtiy E.G.,Oles Gonchar Dnepropetrovsk National University | Khmelenko O.V.,Oles Gonchar Dnepropetrovsk National University | Kovalenko A.V.,Oles Gonchar Dnepropetrovsk National University | Bulany M.F.,Oles Gonchar Dnepropetrovsk National University
YSF 2015 - International Young Scientists Forum on Applied Physics | Year: 2015

It is known that deformation of the flux grown microtwinned crystals zinc sulphide is realized by motion of partial dislocations [1] and therefore it is accompanied by the changes of crystal structure. During the increase of degree of deformation till 18 - 20% in such zinc sulphide crystals is gradually occurred complete detwinning and disappearance of stacking fault [2]. It is reflected in the changes of all structure-sensitive properties including luminescent properties of material. Basic regularities of the process of photoluminescence deformation changes of bivalent manganese impurity centres in zinc sulphide crystals were previously determined [3]. © 2015 IEEE.


Pashchenko V.A.,Oles Gonchar Dnepropetrovsk National University | Khandetskii V.S.,Oles Gonchar Dnepropetrovsk National University
Russian Journal of Nondestructive Testing | Year: 2012

In order to develop a nonstationary theory of eddy-current testing, analytical spatiotempo- ral distributions of the abscissa and ordinate of the elementary vector-potential in the air above a plane surface of an orthotropically conducting composite are obtained using the multidimensional Laplace transform for an expanding zone of propagation of an electromagnetic field in the case of application of excitations from a point element of a plane current contour. © Pleiades Publishing, Ltd., 2012.


Kas'Yan L.I.,Oles Gonchar Dnepropetrovsk National University | Pal'Chikov V.A.,Oles Gonchar Dnepropetrovsk National University | Bondarenko Y.S.,Oles Gonchar Dnepropetrovsk National University
Russian Journal of Organic Chemistry | Year: 2011

Methods of preparation of azetidines, pyrrolidines, and piperidines from epoxides and aziridines were analyzed. The possibility of epoxides conversion into aziridines was considered. The examples of application of azacycloalkanes in the medical and organic chemistry as biologically active substances and synthons for their preparation were calculated. © 2011 Pleiades Publishing, Ltd.


Kas'Yan L.I.,Oles Gonchar Dnepropetrovsk National University | Pal'Chikov V.A.,Oles Gonchar Dnepropetrovsk National University
Russian Journal of Organic Chemistry | Year: 2010

The review analyzes methods for the synthesis of amino alcohols containing cage-like norbornene, norbornane, and adamantane fragments. Such reactions of amino alcohols as selective functionalization of hydroxy and amino groups, as well as heterocyclizations with formation of nitrogen- and oxygen-containing heterocycles, are considered. Biological activity of cage-like amino alcohols and their derivatives and their use as ligands in catalytic asymmetric syntheses are discussed. © 2010 Pleiades Publishing, Ltd.


Chmilenko F.A.,Oles Gonchar Dnepropetrovsk National University | Khudyakova S.N.,Oles Gonchar Dnepropetrovsk National University
Journal of Analytical Chemistry | Year: 2013

We have demonstrated the advantages of the dynamic preconcentration and separation of Pd(II) and Pt(IV) on paper carriers modified with 3-methyl-2,6-dimercapto-1,4-thiopyrone. The optimal conditions of the solid-phase reaction have been determined in Pd(II) sorption; after its separation Pt(IV), has been preconcentrated by sorption as its dimercaptides. Test scales have been produced for the visual determination of 0.5-40 μg Pd(II) and 1-195 μg Pt(IV) in 10- and 100 mL-samples, respectively. In addition, a procedure of their sorption-chromaticity densitometry determination from a single aliquot portion has been developed with detection limits of 5 and 1 ng/mL, respectively, and a procedure of Pd(II) determination using a test strip (cmin = 0.40 mg/L) has been proposed. The procedures have been applied to the determination of palladium and platinum in electrolytes, sludges, and alloys. © Pleiades Publishing, Ltd., 2013.


Kas'yan L.I.,Oles Gonchar Dnepropetrovsk National University | Pal'chikov V.A.,Oles Gonchar Dnepropetrovsk National University | Bondarenko Ya.S.,Oles Gonchar Dnepropetrovsk National University
Russian Journal of Organic Chemistry | Year: 2011

The review summarizes methods for the synthesis of 1,3-oxazolidin-2-ones, 1,3-oxazolidines, and dihydro-1,3-oxazoles from epoxides and aziridines. Possible applications of N,O-containing heterocycles in medicinal and organic chemistry as biologically active substances and intermediate products for their preparation are considered. © Pleiades Publishing, Ltd., 2011.


Pal'chikov V.A.,Oles Gonchar Dnepropetrovsk National University | Prid'ma S.A.,Oles Gonchar Dnepropetrovsk National University | Turov A.V.,Taras Shevchenko National University | Kas'yan A.O.,ProBioGen A.G. | And 2 more authors.
Russian Journal of Organic Chemistry | Year: 2011

Reactions of N-(alkyl-, benzyl-, arylsulfonyl)bicyclo[2.2.1]hept-5-en-exo- 2-ylmethanamines with 2-(chloromethyl)oxirane in the presence of tetramethylammonium iodide gave a number of cage-like N-(oxiran-2-ylmethyl) sulfonamides, as well as N-(exo-5,6-epoxybicyclo[2.2.1]heptan-exo-2-ylmethyl)-4- nitro-N-(oxiran-2-ylmethyl)benzenesulfonamide. The latter was also synthesized by oxidation of oxiran-2-ylmethyl norbornene derivative with peroxy acids. Opening of the epoxide ring in N-(oxiran-2-ylmethyl) sulfonamides in reaction with benzylamine followed the Krasuskii rule, and the aminolysis of N-(exo-5,6-epoxybicyclo[2.2.1]-heptan-exo-2-ylmethyl)-4-nitro-N-(oxiran-2- ylmethyl)benzenesulfonamide chemoselectively occurred at the side-chain epoxy group. © 2011 Pleiades Publishing, Ltd.


Knysh L.I.,Oles Gonchar Dnepropetrovsk National University | Gabrinets V.A.,Oles Gonchar Dnepropetrovsk National University
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu | Year: 2013

Combined PVT-cycle with gallium-arsenide high-temperature solar cells and solar radiation concentrator is proposed to increase the energy performance of solar power plants. Cooling of the solar cells is carried out by means of the coolant which is the cycle fluid of the steam turbine cycle. Purpose: To determine the quantitative indicators of combined PVT-cycle. Temperatures providing high efficiency must be found. Methodology: The research was conducted based on analysis of the function of the overall efficiency of the combined cycle and analysis of its first and second derivatives. The function of the overall efficiency was constructed using the approximation of experimental research for gallium-arsenide solar cells and analytical relationships for the thermodynamic Rankine cycle. Findings: The values of efficiency of combined PVT-power plants with unijunction and heterostructure solar cells were received. The waste heat was used in classic steam turbine cycle. Originality: The methodology allows us to determine, for the first time, the temperature of the solar radiation receiving system, which provides optimal combined conversion performance indicators. The quantitative values of efficiency of combined PVT-cycles were found. Practical value: The method determining the optimal efficiency indicators can be applied when designing the reception systems of prospective PVT-power plants and other systems with similar thermal conversion cycle.

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