Donbas National Academy of Engineering and Architecture

donnasa.edu.ua
Makiyivka, Ukraine
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Bondarev A.,Donbas National Academy of Engineering and Architecture | Yugov A.,Saint Petersburg State University
Procedia Engineering | Year: 2015

Mathematical models of the method of generating large-span rod systems with the manufacturer defect and assembly sequence at construction process are offered in the article. The explanations and formulas used in the universal algorithm that allows generate of the proposed method are offered. This article gives an analysis of previous theoretical and experimental studies. By the example of a cell of hinged-rod system shows the technology to solve this problem by using the suggested method. The results of identifying the potential assembly errors in the metal single collar cylinder shell. Assembly forces are defined that occur in the shell when it is assembled - with mounting influence. © 2015 Published by Elsevier Ltd.


Korsun V.,Donbas National Academy of Engineering and Architecture | Vatin N.,Saint Petersburg State University | Korsun A.,Saint Petersburg State University | Nemova D.,Saint Petersburg State University
Applied Mechanics and Materials | Year: 2014

The article introduces the results of the experimental research of the influence of elevated temperatures on the modified fine-grained concrete strength and strain under axial compression. © (2014) Trans Tech Publications, Switzerland


Postnikov V.A.,Donbas National Academy of Engineering and Architecture | Chertopalov S.V.,Donetsk National University
Crystallography Reports | Year: 2015

The growth of organic single crystals of naphthalene (C10H8) and anthracene (С14H10) at the liquid‒air interface from a mixture of solvents has been investigated. The growth technique used in the study makes it possible to obtain single-crystal sheets up to 10 mm in size for 24 h. The surface morphology and structure of the crystals have been analyzed by optical microscopy and X-ray diffraction. C10H8 and С14H10 single crystals grow coplanarly along the (001) plane. A thermodynamic model of the flat-crystal nucleus formation at the liquid‒air interface, based on the analysis of the change in the free Gibbs energy, is considered. © 2015, Pleiades Publishing, Inc.


Postnikov V.A.,Donbas National Academy of Engineering and Architecture
Russian Journal of Physical Chemistry A | Year: 2014

Liquid-solid phase equilibria are studied in the eutectic benzoic acid-naphthalene system by means of thermic analysis (DTA, CTA), on the basis of which the liquidus line and eutectic point (x e ≈ 50 mol %, T e ± 340 K) are determined and the phase diagram is constructed. Average precrystallization supercooling temperatures ΔT L - of the liquid phase relative to liquidus temperature T L are determined, allowing us to locate the region of solution metastability on the phase diagram. Excessive functions of the components in the liquid phase are found via thermodynamic modeling using the Margules equation and experimental data. The boundaries of the region of liquid solution metastability are estimated from the thermodynamic conditions of solution stability. © 2014 Pleiades Publishing, Ltd.


Samsonenko S.N.,Donbas National Academy of Engineering and Architecture
Physics of the Solid State | Year: 2014

The shape anisotropy of the EPR lines of broken carbon bonds in a dislocation core with an edge component in natural semiconducting type Ic diamonds has been investigated. It has been found that electrically active acceptor centers are formed at dislocation steps, jogs, or kinks. The distance between the paramagnetic centers is determined. © 2014 Pleiades Publishing, Ltd.


Bondarev A.B.,Donbas National Academy of Engineering and Architecture | Yugov A.,Donbas National Academy of Engineering and Architecture
Magazine of Civil Engineering | Year: 2016

The article presents a method for calculating the accuracy of large-span metal rod systems and its mathematical model. The method takes into account the connectivity of hinged-rod metal shells, the technology of their construction and the gaps in the bolted joints. The latter are caused by the the center of the hole deviating from its designed position and by the actual shape of the holes for the bolts designing from the nominal form. An example of calculating the hinged-rod shell with polybolted seams on the lining is described in the article. It is also shown how to use the proposed methodology for calculating the accuracy of hinged-rod metal shells in general combined with the previously proposed method for generating hinged-rod systems. Consequently, the proposed method for calculating the accuracy of large-span metal rod systemscan be used for determining the deviations of both the whole hinge-rod system and its individual elements. in the method presented in this papercan be used when calculating the accuracy of a variety of joint-core multiple systems, made from metal, e.g., support tower chimneys, radio telescopes, cooling towers, antennas and similar structures.


Radionov T.V.,Donbas National Academy of Engineering and Architecture
Journal of Architecture and Urbanism | Year: 2014

In the article the strategic reconstruction issues of standardized development objects that are in the difficult geo-climatic conditions are examined. The solution of such issues depends on the demographic, social and economic position of the considered locality. During the research basic tasks were set that are aimed at the investigation of geological conditions of the area, the detailed analysis of the typological characteristics of buildings and structures that are undergoing the reconstruction as well as taking into account legislative environment of the project activities in this direction. Researches conducted, tasks set and recommendations developed have given the opportunity to present the main results of researches and to formulate definite conclusions. Scientific novelty of the research lies in the development of scientific and practical recommendations concerning the reconstruction of standardized development objects which are located in the difficult geoclimatic conditions. © 2014 Vilnius Gediminas Technical University (VGTU) Press Technika.


Gorokhov Y.V.,Donbas National Academy of Engineering and Architecture | Mushchanov V.P.,Donbas National Academy of Engineering and Architecture | Pryadko I.N.,Donbas National Academy of Engineering and Architecture
Procedia Engineering | Year: 2013

The design work of the spatial pivotal roof with a cut-out in the elliptic setting formed by the system of rigid threads through the sections based on determination of a numerical safety index of a designed structure has been described. The proposed method provides the sequence of solution of problem series: determination rational geometric parameters of a structure; obtaining of appropriate rigidity characteristics of basic bearing elements; determination of a track of elements destruction for typical coating diagram with the following evaluation of stressed and strained state of an object; determination of numerical safety indices of a structure (determination of the lower and upper safety limits). © 2013 The Authors.


Aleksandrov V.D.,Donbas National Academy of Engineering and Architecture
Crystallography Reports | Year: 2014

Regularities of changes in the structure of chemical elements in crystalline and liquid states under the action of temperature and pressure are systematized on the basis of the periodic table. © 2014 Pleiades Publishing, Inc.


Aleksandrov V.D.,Donbas National Academy of Engineering and Architecture | Pokyntelytsia O.A.,Donbas National Academy of Engineering and Architecture
Russian Journal of Physical Chemistry A | Year: 2016

An alternative approach to calculating critical sizes lk of nucleation centers and work Ak of their formation upon crystallization from a supercooled melt by analyzing the variation in the Gibbs energy during the phase transformation is considered. Unlike the classical variant, it is proposed that the transformation entropy be associated not with melting temperature TL but with temperature T < TL at which the nucleation of crystals occurs. New equations for lk and Ak are derived. Based on the results from calculating these quantities for a series of compounds, it is shown that this approach is unbiased and it is possible to eliminate known conflicts in analyzing these parameters in the classical interpretation. © 2016, Pleiades Publishing, Ltd.

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