About the number
CORROSION RESISTANCE OF REPAIR BUILDING MIXES
Authors: A.S. Dzhabarov, V.V. Belov
Abstract: In this paper one of the main characteristics of concrete intended for the repair
and reconstruction of building structures, corrosion resistance, was considered. It was found out
that to increase this characteristic of concrete, it is necessary to take into account a number of
necessary requirements for the composition of the mixture. In addition to using heavy concrete
for repair work, fine-grained and powdered concrete can also be used, which can improve
corrosion resistance.
Keywords: corrosion resistance, mineral additives, repair mixtures, aggressive
environment, biological corrosion, colmatation.
URGENT ISSUES OF INNOVATIONS IN WORK
AT HEIGHT SAFETY REGULATIONS
Authors: A.M. Puzyrev, L.V. Kozyreva
Abstract: The article analysis Work at Height Safety Regulations approved by order
№ 782n dtd. November 16, 2020 of the Russian Ministry of Labour and Social Protection: it
deals with the main the changes in the Russian Work at Height Safety Regulations: the
requirements for employees, allowed to work at height are given, age and educational
qualifications for safety groups are specified, the documentation for work at height, including the
forms of documents is discussed. The conclusions in whole about the changes of the Regulations
of the Occupational Safety for working at height are drawn. The article can be useful to a wide
range of occupational safety specialists as analytical tools.
Keywords: safety system for working at height, safety groups for working at height,
permit for working at height, professional risks.
SOCIO-CULTURAL ASPECT OF URBAN DEVELOPMENT
SMALL HISTORICAL SETTLEMENTS OF THE TVER REGION
Authors: V.V. Fedorov, M.V. Fedorov
Abstract: The differences in the socio-cultural development of large and small cities,
which are reflected in the activity of mass consciousness, are emphasized. The relevance of the
choice of the operator of the features of the place of residence and activity is shown, when the
decisive factor is the scale of populated places, their correlation in the open space and the
characteristic features generated by these circumstances. The increasing complexity of the
epidemiological situation, the expansion of the digital economy, and the improvement of the road
transport infrastructure put on the agenda the tasks of more fully involving small cities in the
active life of the region and the country. It is noted that small towns and historical settlements
receive additional opportunities to realize their potential. Legally, the municipal authorities have
the necessary rights, but their economic and socio-cultural situation does not allow them to be
implemented to the necessary extent. A typological comparison of the socio-cultural
characteristics of a large and small city is proposed. The role of small historical settlements in the
development of the Tver region is considered.
Keywords: small historical city, mass culture, reconstruction of buildings, urban
development, reconstruction of coastal territories.
BUCKLING OF THE STEEL ROD 45 UNDER THE ACTION
OF AXIAL COMPRESSION
DURING THE ELASTIC OPERATION OF THE MATERIAL
Authors: S.V. Cheremnykh
Abstract: The problem of loss of stability of an isolated pivotally reinforced rod of a thinwalled circular cross-section under combined loading by an axial compressive force and a torque
is investigated. The problem is solved in the bifurcation formulation under the elastic operation
of the material. Equations are obtained for calculating the critical stress intensity as a function of
the flexibility of a thin-walled rod in the implementation of proportional processes of combined
subcritical loading by axial compressive force and torque in the plane of the deviator space of
deformations of A.A. Ilyushin. Algorithms and programs for solving the problem of bifurcation
of a thin-walled rod of circular cross-section under combined loading by an axial compressive
force and a torque are developed for both elastic and elastic-plastic work of the material. An
equation is obtained for calculating the critical load in the elastic problem of buckling of a thinwalled circular cylindrical shell under axial compression. In order to verify the obtained
equations, a model elastic problem is solved.
Keywords: rod, subcritical loading, material deformation, bifurcation, torque, nonconservative system.
ASSESSMENT OF AIR NOISE ISOLATION OF PARTITIONS MADE
OF BLOCKS WITH NON-REMOVABLE VOID GENERATORS
Authors: V.A. Yasyukovich, V.I. Trofimov
Abstract: In the era of technological progress, much attention is paid to such a problem
as noise, the long-term impact of which has a negative impact on the human body. It is noted that
the walls of residential buildings erected from blocks based on light concrete and not only do not
always meet the necessary requirements for sound insulation. Therefore, this paper considers the
effectiveness of using concrete blocks with non-removable tubular voids, as partitions, for noise
insulation in residential buildings. The calculation was made to determine the calculated values of
the air noise insulation index for model samples of blocks and blocks of standard sizes. A
comparison with the nearest analogues is given. At the end, the main conclusions are presented,
based on the results of calculating the noise insulation properties of the studied blocks,
comparing them with regulatory requirements and analogues.
Keywords: beton, voidness, insulation index, air noise, partition made of blocks, void
formers, calculation of sound insulation.
ECONOMIC AND MATHEMATICAL MODEL OF OPTIMIZATION
OF REPAIR AND PREVENTIVE MAINTENANCE OF SWITCHING
AND STARTING EQUIPMENT WITH DIAGNOSTICS
OF THE INSULATION CONDITION
Authors: G.S. Kuzmin
Abstract: The article presents the conclusion of the objective function, which is a
probabilistic economic and mathematical model for optimizing the frequency of maintenance of
switching and starting devices. The model is designed for a maintenance strategy, in which the
decision to repair or replace the device is made based on the results of periodic monitoring of the
insulation resistance, combined with a repair inspection and checking the serviceability of
mechanical parts. The specific repair and maintenance costs are taken as the target function.
Keywords: electrical switching and starting devices, repair, prevention, maintenance,
optimization model, target function, reliability, time to failure, electrical insulation.
ENERGY FORECASTING AS A SPHERE
OF SYSTEM APPROACH AND EXPERIMENTAL SOLUTIONS
ON THE BASED EXISTING MODELS AND METHODS
Authors: S.V. Marinova
Abstract: The article describes types and methods of forecasting, models of domestic and
foreign solutions.
Keywords: electricity forecasting, electricity forecasting methods, electrical load.
ON THE CENTERS OF SYMMETRY OF A FLAT CONVEX PLATE
Authors: Al.A. Shum
, A.M. Vetoshkin
, An.A. Shum
Abstract: The concept of the center of n-symmetry of a flat plate is considered. Special
cases of n-symmetry are s-symmetry and c-symmetry (0-symmetry and 1-symmetry,
respectively). The previously established sufficient criterion for the coincidence of the center of
c-symmetry of a flat convex plate with the origin is transferred to the general case of n-symmetry
Keywords: symmetry, c-symmetry, s-symmetry, n-symmetry, center of symmetry,
half-mass line, equilibrium line, density function, mass, center of mass, electric machine.
REGULATION OF RHEOLOGICAL PROPERTIES
THREE-PHASE DISPERSE SYSTEMS USED
FOR THE PRODUCTION OF CONSTRUCTION MATERIALS
Authors: V.V. Belov
Abstract: The work considers the connection of rheological properties of three-phase
disperse systems with capillary adhesion and on this basis the possibility of directional regulation
of rheological properties of raw mixtures for production of building materials is justified. It is
shown that rheological properties of two-phase disperse systems are determined mainly by action
of intermolecular forces in liquid-filled contact zones of solid phase particles, and in three-phase
systems – by action of capillary adhesion forces.
Keywords: rheological properties, two-phase systems, three-phase systems, disperse
systems, regulation, capillary adhesion
DEVELOPMENT OF METHODS FOR OBTAINING
POLYSACCHARIDE CAPSULES FOR DOSAGE FORMS
BASED ON WATER EXTRACTS OF SEAWEED
Authors: I.I. Karpenko, O.V. Manaenkov, K.O. Il'ina, V.P. Molchanov
Abstract: The aim of the work is to create methods for obtaining polysaccharide
capsules based on aqueous extracts of seaweed for the subsequent development of dosage
forms and food products of increased authenticity and biological quality that correspond
to the current level of knowledge about the role of nutrition in maintaining health and
meet the requirements of the consumer market. The article presents a brief analysis of the
scientific and technical literature on the issues of obtaining encapsulated forms of nutrients that
can be used in the creation of functional food products, considers the main methods and
techniques of microcapsulation and describes the results of search experiments to determine the
gel-forming ability of kelp gel and sodium alginate, as well as to study the process of dissolving
tablets with different coatings in modes that simulate the conditions of the stomach and
intestines.
Keywords: biopolymers, biologically active substances, immobilization, encapsulation,
dosage forms, polysaccharide capsules, seaweed.
BEHAVIOUR OF THE PRECIPITATIONS ACIDITY IN TVER, 1990–2020
Authors: F.V. Kachanovsky
Abstract: Analysis had made of dynamics of the precipitation acidity (atmospheric
precipitation had fallen in Tver in 1990–2020 years). Time series models of the indicator pH
were examined. Cubic and quadratic models have considered as adequate. Seasonal indices of the
indicator pH preserved his character in spite of time series lengthening.
Keywords: acidity, acid rain, precipitation, model, time series, trend, cycle component,
seasonal component, residuals, indicator pH.