Donets'k, Ukraine

Donetsk National Technical University is the biggest and oldest higher education establishment in Donbass, founded in 1921. It was originally located in Donetsk, Ukraine, but as a result of war in Donbass it was relocated to Krasnoarmiysk. In its early years, it was attended by Nikita Khrushchev. Wikipedia.


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Gutarevych V.,Donetsk National Technical University
Transport Problems | Year: 2012

The mathematical model of suspended monorail track with allowance for elastic strain which occurs during movement of the monorail carriage was developed. Standard forms for single span and double span of suspended monorail sections were established.


Galiakhmetov A.M.,Donetsk National Technical University
Classical and Quantum Gravity | Year: 2010

Exact general solutions to the Einstein-Cartan equations are obtained for spatially flat isotropic and homogeneous cosmologies with a nonminimally coupled scalar field. It is shown that both singular and nonsingular models are possible. Exact general solutions of an analogous problem in the torsion-less case are derived. The role of torsion in the evolution of models is elucidated. © 2010 IOP Publishing Ltd.


Petrovich N.A.,Donetsk National Technical University
2016 2nd International Conference on Intelligent Energy and Power Systems, IEPS 2016 - Conference Proceedings | Year: 2016

Modelling is an integral part of end-to-end computer-aided design. However, modelling real-time systems remains fragile and long-term. A method is proposed for the sustainable co-simulation of control objects and devices for relay protection and automation at rapid time of a single calculation. The relevance of objectives is the continual improvement of the hardware components, technological equipment and software requirements for the construction of electric power networks. Decisions are based on the representation of objects of information flows. We show how to improve the algorithms of the devices on the basis of mutual correspondence of two generalised block diagrams of the control object and control devices. We highlight the widget for a graphical display terminal, desktop and mobile devices for solving 'bottleneck' problems of information, and outsourcing of auxiliary services networks. An example presents the improvement algorithms of active and passive 'not under stress' self-monitoring. The self-control system will provide automatic maintenance of the efficiency of the network with the Petersen's coil over long-time intervals of operation for multiple collaborating network sites for smart-grids. © 2016 IEEE.


Galiakhmetov A.M.,Donetsk National Technical University
International Journal of Theoretical Physics | Year: 2013

Flat Friedmann universes filled by radiation, stiff fluid and a nonminimally coupled ghost scalar field with polynomial potentials of the fourth degree V(Φ) are investigated in the framework of the Einstein-Cartan theory. Exact solutions are obtained and analyzed for an arbitrary coupling constant ξ. It is shown that both singular and bouncing models with the late-time accelerated expansion are possible. A comparative analysis of the cosmological models with and without stiff fluid is carried out. The role of sources in the evolution of models is elucidated. Some conclusions from comparison of the presented results with other approaches in literature for accelerated expansion are made. © 2012 Springer Science+Business Media New York.


Galiakhmetov A.M.,Donetsk National Technical University
General Relativity and Gravitation | Year: 2013

Exact general solutions for spatially flat isotropic and homogeneous cosmologies with a nonminimally coupled ghost scalar field that has polynomial potentials of the fourth degree are obtained in the framework of the Einstein-Cartan theory (ECT) and general relativity (GR). The special values of coupling constant ξ and restrictions on ξ are found for the above solutions. Some effects of torsion and scalar field potential are elucidated. It is shown that solutions can describe the bouncing models with the late-time accelerated expansion. It is demonstrated that some models admit the unified scenario for dark matter and dark energy: (i) both singular models in ECT with a de Sitter-like asymptotic and with the power-law (t4/3) asymptotic at late times, (ii) singular and nonsingular models in GR with a de Sitter-like asymptotic at late times. © 2012 Springer Science+Business Media New York.


Sachsenhofer R.F.,University of Leoben | Privalov V.A.,Donetsk National Technical University | Panova E.A.,Ukrainian Academy of Sciences
International Journal of Coal Geology | Year: 2012

The Donets Basin is a major coal-mining district in eastern Ukraine and adjacent portions of Russia. It comprises the Donbas Foldbelt, which is the uplifted and compressionally deformed part of the Pripyat-Dniepr-Donets (PDD) Basin, and the significantly less deformed Western Donbas region. The PDD Basin is a Late Devonian rift structure located within the East European Craton. Thick coal-measures formed during the post-rift stage of the basin in Serpukhovian to Moscovian times, when about 130 seams, each with a thickness over 0.45. m, have been deposited.Early Serpukhovian coal accumulated in a relatively narrow shore-zone. It is rich in inertinite and liptinite and very low in ash. Bashkirian and Moscovian coal have a significantly wider lateral extension and are generally rich in vitrinite. Bashkirian and Moscovian coal seams usually have high ash yields (12-18%) and high sulfur contents (2.5-3.5%), but these data vary significantly depending on peat facies.Coal rank ranges from subbituminous to anthracite and is mainly controlled by the depth of the seams and the heat flow during maximum (Permian) burial. Permo-Triassic thermal events locally overprinted the resulting coalification pattern. Coked coal occurs at the contact to presumed Permian sills and dikes southwest of Donetsk. Deep Permian burial was followed by major Permian and Mesozoic uplift events.The Donets Basin hosts proven reserves in the order of 60 Gt at the exploitable depth. The thickness of coal seams currently mined is in the range of 0.6 to 2.5. m. Production during 2009 was 68.7. Mt in the Ukrainian and 4.9. Mt in the Russian part of the basin. Coal mines in the Donets Basin are among the gassiest in the world. The average methane content of coal is 14.7. m/t, but numerous seams have significantly higher gas content. The high methane content presents a severe mine safety problem. On the other hand, it represents also a high potential for coal mine bed methane projects. Emissions of coal gas released by mining and related structurally induced underground hazards (coal and gas outbursts) are a major problem for safe and efficient coal exploitation in the basin. © 2011 Elsevier B.V.


Galiakhmetov A.M.,Donetsk National Technical University
Classical and Quantum Gravity | Year: 2011

Exact general solutions to the Einstein-Cartan equations are obtained for spatially flat isotropic and homogeneous cosmologies with a nonminimally coupled scalar field that has polynomial potentials of the fourth degree V(Φ). An analogous problem is investigated in Einstein's theory of general relativity. Some effects of torsion are elucidated. A comparative analysis of the cosmological models with and without V(Φ) is carried out in the context of the Einstein-Cartan theory. The role of the scalar field potential in the dynamics of models is discussed. © 2011 IOP Publishing Ltd.


Onishchenko V.,Donetsk National Technical University
Mechanism and Machine Theory | Year: 2015

In this paper, we present results from theoretical and experimental investigations into the teeth wear of spur gears of heavy duty machines. During operation, boundary friction and scuffing result on their working surfaces. Theoretical investigations were carried out using the tooth wear model, which takes into account the instantaneous contact temperature according to Blok's concept. The model simulates the continuous interaction of the teeth forms as a function of contact parameters and the effect of these parameters on the shape of the teeth profiles. The validity of the theoretical model was confirmed by experimental investigation. © 2014 Elsevier Ltd. All rights reserved.


Galiakhmetov A.M.,Donetsk National Technical University
Gravitation and Cosmology | Year: 2016

Flat Friedmann cosmologies with stiff fluid are considered in the framework of the Einstein–Cartan theory. The version of this theory which simultaneously takes into consideration two sources of torsion, namely, a perfect fluid with the vacuum equation of state and a nonminimally coupled scalar field, is studied. It is demonstrated that, for bouncing models, phantom cosmologies with and without a Big Rip singularity are possible. Singular expanding models are presented where the early stages are dominated by a scalar-torsion field which behaves as an ultrastiff fluid, while the late stages are dominated by a perfect fluid which causes a de Sitter asymptotic. Some cosmological consequences of two sources of torsion are discussed. © 2016, Pleiades Publishing, Ltd.


Galiakhmetov A.M.,Donetsk National Technical University
General Relativity and Gravitation | Year: 2012

Exact general solutions to the Einstein-Cartan equations are obtained for spatially flat isotropic and homogeneous cosmologies with a nonminimally coupled scalar field and perfect fluid. Some effects of torsion are revealed by solving an analogous problem in general relativity. A comparative analysis of the cosmological models with and without perfect fluid is carried out in context of the Einstein-Cartan theory. The role of perfect fluid in the dynamics of models is discussed. © 2012 Springer Science+Business Media, LLC.

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