69439 2658-5553 AlfaBuild 25 5 25 2022 1-5
RAR RUS 2501-2501 0000-0002-7610-3503 National Research Mordovia State University Masenina Elena Vasilyevna elena.masenina@mail.ru
Saransk, Russian Federation
 0000-0002-5042-2899 Lobachevskiy State University of Nizhniy Novgorod Zaharova Elena Alexzandrovna zaharova64ea@mail.ru
Nizhniy Novgorod, Russian Federation
 57191250834 0000-0003-1506-8502 National Research Mordovia State University Erofeeva Irina Vladimirovna ira.erofeeva.90@mail.ru
Saransk, Russian Federation
 0000-0002-5201-4098 Federal State Budgetary Educational Institution of Higher Education South-West State University SWSU Tolmacheva Valeria Mikhailovna 325573@mail.ru
Kursk, Russian Federation
 A-7827-2017 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir Trofimovich yerofeevvt@mail.ru
Saransk, Russian Federation
 ABE-1858-2021 57208300172 0000-0003-0031-7270 Peter the Great St. Petersburg Polytechnic University Kotliarskaia Irina Leonidovna iravassilek@mail.ru
St. Petersburg, Russian Federation
 Microbiological contamination of reinforced concrete structures in the poultry complex The object of research is a microbiological contamination of reinforced concrete structures of the poultry house. Method. The species composition of microorganisms settled on the selected samples of reinforced concrete structures was determined in laboratory conditions. The identification of microscopic fungi was carried out according to their morphological and cultural characteristics using determinants: K. B. Raper, C. A. Thorn, 1949; K.B. Raper, D.I. Fennel, 1965; N.P. Podopilchenko (1971); M.A. Litvinov (1967); A.A. Milko (1974); Т.С. Кириленко (1977); K. Donch, V. Gams, 1980; A.U. Lugauskas, A.N. Mikulskene, D.U. Shlyauzhene (1987); V.I. Bilay, E.Z. Koval (1988). Results. Biodegradation processes in buildings with different service lives are considered. Biodegraders that affect biodegradation of concrete and reinforced concrete structures have been identified. 10.57728/ALF.25.1 69 Poultry complexes reinforced concrete structures Microbiological contamination Microbiological studies Destruction mechanics Biological corrosion Bacteria Aspergillus Alternaria Penicillium Cladosporium Chaetomium Fusarium Paecilomyces https://alfabuild.spbstu.ru/article/2022.25.1/
RAR RUS 2502-2502 A-7827-2017 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir Trofimovich yerofeevvt@mail.ru
Saransk, Russian Federation
 55996501600 0000-0001-7401-1202 National Research Mordovia State University Bazhanova Margarita Evgenievna Mbazhanova@yandex.ru
Saransk, Russian Fede
 57220160973 0000-0001-6095-5667 Ogarev Mordovia State University Zotkina Marina Mihailovna zotkina.mm@yandex.ru
Saransk, Russian Federation
 0000-0002-5201-4098 Federal State Budgetary Educational Institution of Higher Education South-West State University SWSU Tolmacheva Valeria Mikhailovna 325573@mail.ru
Kursk, Russian Federation
 55996501600 0000-0001-7649-3911 National Research Mordovia State University Saltanova Tatiana Aleksandrovna salt-tanyuska@yandex.ru
Saransk, Russian Federation
 National Research Mordovia State University Akhmedova Govkher ahmedovarslan597@gmail.com
Saransk, Russian Federation
 0000-0002-1187-9933 National Research Mordovia State University Akhmedov Arslan arslan.akhmedov.92@mail.ru
Saransk, Russian Federation
 ABE-1858-2021 57208300172 0000-0003-0031-7270 Peter the Great St. Petersburg Polytechnic University Kotliarskaia Irina Leonidovna iravassilek@mail.ru
St. Petersburg, Russian Federation
 Corrosion of metal and polymer materials in soil operating conditions The object of research is corrosion of metal and polymer materials in soil operating. Method. Experimental studies of soil corrosion of samples made from metal piping materials of different manufacturers, as well as polymer composite materials based on an epoxy binder in soil conditions of the Republic of Mordovia (Russia). Metal samples were exposed to various types of soils (chernozem and loam) at a depth of 410 mm and 630 mm. Polymeric materials were located in various soils at a depth of 0.5 m and 1.5 m. During the tests, the samples were kept under conditions of variable temperature and humidity for 12 months. Microbiological studies were carried out to identify microorganisms on the surface of the samples. Results. The species composition of microorganisms that settled on the samples during the tests was established, and changes in the mass-strength properties of the composites were revealed. Methods for protecting pipeline materials from biological damage are proposed.   10.57728/ALF.25.2 69 Construction materials Pipelines Polymers Biodeterioration Microorganisms Soil corrosion https://alfabuild.spbstu.ru/article/2022.25.2/
RAR RUS 2503-2503 A-7827-2017 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir Trofimovich yerofeevvt@mail.ru
Saransk, Russian Federation
 0000-0002-7282-9251 National Research Mordovian State University Likomaskina Maya Alekseevna chakichevama@list.ru
Saransk, Russian Federation
 AAB-4881-2022 57214232767 0000-0001-7976-9792 Ogarev Mordovia State University Afonin Viktor Vasilyevich vvafonin53@yandex.ru
Saransk, Russian Federation
 0000-0001-8898-0709 National Research Mordovia State University Likomaskin Alexander Ivanovich alekslik@inbox.ru
Saransk, Russian Federation
 0000-0002-5201-4098 Federal State Budgetary Educational Institution of Higher Education South-West State University SWSU Tolmacheva Valeria Mikhailovna 325573@mail.ru
Kursk, Russian Federation
 ABE-1858-2021 57208300172 0000-0003-0031-7270 Peter the Great St. Petersburg Polytechnic University Kotliarskaia Irina Leonidovna iravassilek@mail.ru
St. Petersburg, Russian Federation
 Microbiological resistance of sand-bitumen concrete The object of research is the biological resistance of twenty-two samples of asphalt concrete with different bitumen content. Method. Laboratory testing of samples of asphalt concrete mixtures for fungal resistance and the presence of antifungal properties. Determination of changes in strength and elastic-plastic properties of materials. Results. Based on the conducted studies of biostability and the proposed methods for monitoring changes in hardness and modulus of deformation, the most preferable compositions were deter-mined with respect to their resistance to the effects of filamentous fungi. For each group of samples and mixtures of bitumen concrete under study, their ranking according to the degree of the resistance to the effects of the external microbiological medium is provided. 10.57728/ALF.25.3 69 Bitumen concrete Strength Hardness Resistance Filamentous fungi Modulus of deformation Linear interpolation Hermite interpolation Mean square error https://alfabuild.spbstu.ru/article/2022.25.3/
RAR RUS 2504-2504 0000-0003-1814-6334 Moscow Aviation Institute Khomutskaya Olga Vladislavovna khomutskayaov@gmail.com
Moscow, Russian Federation
 0000-0002-0138-3950 Moscow Aviation Institute Kopylov Denis Aleksandrovich kopylov-denis@inbox.ru
Moscow, Russian Federation
 0000-0003-0412-3262 Moscow Aviation Institute Vantsov Sergey Vasilevich van2851@mail.ru
Moscow, Russian Federation
 Plane strain predictive estimation method The object of research is a plane strain predictive estimation method. Method. Assessment of flat deformation was carried out on the example of flat deformation of printing blanks due to thermal and chemical influences, which the blanks are repeatedly exposed in the process of receiving boards. The study was conducted on twenty -five manufactured blanks for printed circuit boards. Results. The dependence of the deformation on the parameters of the printed circuit board is non-linear. It is determined that in order to identify the dependencies of deformation on the position of the reference points, the most effective is the algorithm for processing the primary data arrays according to the criteria Precision, Recall, F1. The proposed method makes it possible to increase the prediction of deformation of the multilayer structure of the board. 10.57728/ALF.25.4 69 Plane deformation Deformation Circuit Boards Artificial Intelligence Prediction Method https://alfabuild.spbstu.ru/article/2022.25.4/ 2504.pdf
RAR RUS 2505-2505 H-9967-2013 16412815600 0000-0002-8588-3871 Moscow Power Engineering Institute Kirsanov Mikhail Nikolaevich mpei2004@yandex.ru
Moscow, Russian Federation
 Mathematical model of a spatial rectangular contour-type truss deformations The object of research is spatial structure of a rectangular contour-type cover. A diagram of a statically determinate truss in the form of a closed rectangle with supports along the inner contour is proposed. The truss consists of quadrangular bar pyramids assembled into a square contour with tops connected by a bar belt. Four horizontal braces are located at the corners of the structure. A vertical load is considered, evenly distributed over the nodes of the truss. Method. The design is statically determinate, therefore, to calculate the forces in the rods, it is enough to solve the system of equations for the equilibrium of nodes. The matrix of the system of equilibrium equations consists of the direction cosines of the forces, which are calculated from the coordinates of the nodes. The derivation of the formula for the dependence of the deflection of several characteristic points of the structure on the number of panels in the truss is given. The conclusion is based on an inductive generalization of the decision sequence for structures with an increasing number of panels. The coefficients of the sought formulas are found from the solution of homogeneous linear recurrent equations. Results. The solution of the equilibrium equations of the nodes and all transformations are performed in the Maple symbolic mathematics system. Linear asymptotics of solutions are found. The two main results of the work are the development of a scheme for a regular spatial statically determinate rectangular truss and obtaining an analytical dependence of the deflection of the structure on the number of panels. 10.57728/ALF.25.5 69 Spatial truss Induction Maple Deflection Square Contour Distribution of forces Asymptotics https://alfabuild.spbstu.ru/article/2022.25.5/ 2505.pdf
RAR RUS 2506-2506 7005346094 0000-0003-4261-9840 Southwest State University Bulgakov Alexey Grigor’evich agi.bulgakov@gmail.com
Kursk, Russian Federation
 0000-0003-1951-7299 Southwest State University Dubrakova Ksenia Olegovna Dko1988@yandex.ru
Kursk, Russian Federation
 0000-0003-1646-5470 Kvasnikova Anna Nikolaevna kvasnikova.anna@list.ru 0000-0003-0018-3452 National Research Ogarev Mordovia State University Antoshkin Vasiliy Dmitrievich antovd@mail.ru
Saransk, Russia
 ABE-1858-2021 57208300172 0000-0003-0031-7270 Peter the Great St. Petersburg Polytechnic University Kotliarskaia Irina Leonidovna iravassilek@mail.ru
St. Petersburg, Russian Federation
 The module of deformation of a composite material during bending under force and medium load The object of research is the module of deformation of a composite material during bending under force and medium load. Method. Mathematical modeling of the rheological model. Results. The relationship between the determination of the long-term strength of a compressed wood bar and the deformation of structures with the simultaneous manifestation of power and environmental resistance is established. Equations are written for determining the long-term modulus of deformation of wood, considering the influence of importance based on processing the results of the experiment. Using different values measured in bending tests, deflections and deformations associated with the deformation characteristics of the structure material under various stress-strain states, analytical dependencies were obtained that can be used in the calculations of timber structures. 10.57728/ALF.25.6 69 Stability of Timber Systems Relative deformation Modulus of deformation of composite material Strength of timber Linear creep of timber Rheological model of deformation of the material Deformation https://alfabuild.spbstu.ru/article/2022.25.6/
RAR RUS 2507-2507 H-9967-2013 16412815600 0000-0002-8588-3871 Moscow Power Engineering Institute Kirsanov Mikhail Nikolaevich mpei2004@yandex.ru
Moscow, Russian Federation
 0000-0002-6848-0974 Moscow Power Engineering Institute Luong Cong Luan luongcongluan96@gmail.com
Moscow, Russian Federation
 Deformations and natural frequency spectrum of a planar truss with an arbitrary number of panels The object of the study is a planar, statically determined lattice truss on two supports. The lower belt of the contour structure is an isosceles trapezoid. The task is to obtain formulas for the dependence of the deflection and lower limit of the truss natural frequency on the number of panels. To obtain the deviation value, the Maxwell – Mohr formula is used. The forces in the rods are determined in a conditional form by cutting out nodes from the solution of a system of linear equations in the Maple computer mathematics system. The system of equations includes both the forces in the rods and the reactions of the supports. Analytical expressions for the lower limit of the truss natural frequency is found using the Dunkerley formula and the induction method for an arbitrary number of panels. It is assumed that the mass of the truss is concentrated in its nodes, each having one degree of freedom, and the rigidity of the rods is the same. Based on the results of deflection calculations in a series of similar trusses with different numbers of panels, the desired dependence of deflection on load, elastic properties of rods, and the number of panels is derived. In this paper, a linear asymptote of the deflection problem is found. The analytical frequency estimate is compared with the lowest frequency of the entire frequency spectrum found numerically. Regularities in the distribution of frequencies in the spectrum of trusses of various orders are found. 10.57728/ALF.25.7 69 Truss Deflection Induction Maple Natural frequency Maxwell–Mohr formula Dunkerley method Spectra of frequencies Spectral constant https://alfabuild.spbstu.ru/article/2022.25.7/ 2507.pdf
RAR RUS 2508-2508 A-7827-2017 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir Trofimovich yerofeevvt@mail.ru
Saransk, Russian Federation
 0000-0002-4244-0579 Ogarev Mordovia State University Cherushova Natalia Vladimirovna cherushova@yandex.ru 0000-0001-5511-7407 Joint Stock Company "Russian Railways" Cherushov Kirill Andreevich cherushovk@yandex.ru 57220160973 0000-0001-6095-5667 Ogarev Mordovia State University Zotkina Marina Mihailovna zotkina.mm@yandex.ru
Saransk, Russian Federation
 0000-0002-3355-9164 Ogarev Mordovia State University Matrosova Ekaterina Andreevna k_mart@bk.ru The choice of pigments for paints and varnishes on epoxy binder The object of research is decorative polymer composites. Epoxy resin ED-16, which was cured with polyethylenepolyamine, was used as a binder for polymer composites. Organic and inorganic pigments were used to color the compositions. The aim of the work is to experimentally substantiate the techniques and methods for obtaining effective anti-corrosion protective materials for decorative purposes based on epoxy binders. Method. The study of structural changes in paints and varnishes was carried out by IR spectroscopy, based on the absorption of individual functional groups in the IR region. Determination of tensile strength and relative elongation of epoxy composites were established using physical and mechanical methods. Results. Using infrared spectroscopy methods, it was found that the degree of polymerization of paint and varnish polymeric materials is significantly influenced by the nature of the pigment used. The dependences of the change in the tensile strength and relative elongation on the type of pigment and its content were experimentally established. re composite materials based on an epoxy binder with various pigments. The purpose of the research is to substantiate the proposed methodology for analyzing the color change of protective coatings and to evaluate the decorative properties of epoxy composites used in marine climate conditions. 10.57728/ALF.25.8 69 Paints and varnishes Polyethylenepolyamine Pigments Decorative composites Structure formation Properties Strength Elongation https://alfabuild.spbstu.ru/article/2022.25.8/ 2508.pdf
RAR RUS 2509-2509 A-7827-2017 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir Trofimovich yerofeevvt@mail.ru
Saransk, Russian Federation
 0000-0002-7142-5087 Ogarev Mordovia State University Martynov Andrey Alexandrovich am-kor@bk.ru 57220160973 0000-0001-6095-5667 Ogarev Mordovia State University Zotkina Marina Mihailovna zotkina.mm@yandex.ru
Saransk, Russian Federation
 0000-0002-4244-0579 Ogarev Mordovia State University Cherushova Natalia Vladimirovna cherushova@yandex.ru The effect of solvents on the biostability of epoxy composites in the marine climate The object of research is epoxy composite materials with various solvents. Acetone, gasoline, solvent grade P647 and butanol were considered as solvents. The aim of the work is to establish the biological resistance of epoxy materials in marine climate conditions with the prospect of their use as impregnating compositions. Method. The biological resistance of epoxy composites was assessed by the species composition of microorganisms on the surface of the samples after they were kept for 21 months in an open area under natural and climatic conditions in Gelendzhik (Russia). The fingerprint method was used to identify microorganisms from the surface of the samples. Results. The species composition of microorganisms inhabiting epoxy composites was experimentally determined, depending on the type of solvent and the quantitative content of the hardener. Samples with solvents in their composition (gasoline and butanol) turned out to be the most resistant of the studied (30 mass parts of the solvent) to the aggressive effects of microorganisms. Compositions containing 12 mass parts of the hardener in their composition have the lowest biological resistance of the studied ones. 10.57728/ALF.25.9 69 Bio-damage Climate resistance Mycelial fungi Epoxy resin Polyethylenepolyamine Solvent https://alfabuild.spbstu.ru/article/2022.25.9/ 2509.pdf