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IMPACT OF GRANULOMETRIC COMPOSITION
ON ULTRASONIC PROCESSING EFFICIENCY
OF FINE-GRAINED CONCRETE
Authors: V.V. Belov, P.V. Kulyaev, А.А. Artemyev
Abstract: Ultrasonic methods are widely used in the construction industry as methods
of defectoscopy and non-destructive testing of physical and mechanical characteristics of
concrete in structures. At the same time, ultrasonic treatment of concrete mix and freshly laid
concrete can be used for the purpose of modifying its structure and properties as well. The
relevance of the topic is directly related to the consideration of issues related to savings in
construction, since it allows you to reduce the cost of introducing expensive cements into the
concrete.
Keywords: ultrasonic processing, micro-level reinforcement, optimal particle size
measurement, highest particle packing, software package modeling.
USE OF POLYPROPYLENE FIBERS IN CONCRETE FABRICATED
WITH RECYCLED AGGREGATES
Authors: P.Y. Matar
, G.-Ph.G. Zéhil
, J.J. Assaad
, T.R. Barkaya
Abstract: This article presents an overview of two research works investigating the effect
of polypropylene fibers on the properties of recycled aggregate concrete (RAC) and, particularly,
self-consolidating concrete(SCC) incorporating recycled aggregates. The following properties of
RAC were evaluated: compressive strength, splitting tensile strength, flexural strength, modulus
of elasticity, Poisson’s ratio, density, absorption, and voids. As for the SCC including recycled
aggregates, the workability, compressive strength, and tensile strength were examined.
Keywords: recycled aggregates, recycled concrete, self-consolidating concrete,
polypropylene fibers, physical and mechanical properties, rheological properties.
OVERVIEW OF THE SPATIAL DATA INFRASTRUCTURE
OF THE RUSSIAN FEDERATION AND THE PEOPLE'S REPUBLIC OF CHINA
Authors: V.V. Krylova, L.A. Stepanova
Abstract: The analysis of domestic and foreign experience in the field of spatial data
infrastructure design is presented. The article discusses the stages of development, structure and
elements of the spatial data infrastructure of the Russian Federation and the people's Republic of
China.
Keywords: spatial data infrastructure, SDI, China, GIS, GPS.
ARCHITECTURAL AND LANDSCAPE ENVIRONMENT
IN URBAN PLANNING SCREEN
Authors: V.V. Fedorov, M.V. Fedorov
Abstract: It is noted that the role of the image of the city in cinema is due to the
dominance of megacities and agglomerations in the modern world, as well as and the
practically unlimited possibilities of computer modeling of the visual environment.
Architectural and landscape environment-an attribute of almost any film narrative-performs the
following functions. It is stated that due to the large life cycle of buildings and structures, the
environment in which the next generation will live de facto already exists, representing the
architecture of the prospective (foreseeable future). It is shown that computer technologies of
generative design and parametric design of architectural and landscape environment allow us to
explore a wide range of prospective architectural and landscape solutions in the field of
cinematography.
Keywords: architectural environment of the prospective (future), film image of the
environment, computer technology of environment modeling.
SOLVING THE PROBLEM OF STABILITY UNDER COMPLEX LOADING
FOR TRAJECTORIES IN THE FORM OF CIRCLES
AND ARCS OF CIRCLES IN A COMPUTER PROGRAM
Authors: S.V. Cheremnykh
Abstract: Discusses the impact of the complexity of loading at the bifurcation at the
critical parameters of stress and strain in the implementation of complex processes pre-critical
deformation of a circular cylindrical shell in the coordinate plane Э1 – Э3. The equations of the
relationship between stresses and strains in the construction of the image of the loading process
are accepted in accordance with the defining relations of the coplanarity hypothesis [1–3]. The
material parameters p and q of the approximations of the determining plasticity functions in the
theoretical construction of the image of the loading process are taken according to the principle
of the best approximation to the experimental data. Proposed innovative methods to solve
stability problems under complex loading trajectories of circles and circular arcs in the
direction of structural mechanics and solid mechanics implemented in the developed computer
program.
Keywords: computer program, stability, bifurcation, shell, complex loading, trajectory,
tension, deformation.
SOLVING THE PROBLEM OF STABILITY UNDER COMPLEX LOADING
FOR TRAJECTORIES IN THE FORM OF CIRCLES
AND ARCS OF CIRCLES IN A COMPUTER PROGRAM
Authors: S.V. Cheremnykh
Abstract: Discusses the impact of the complexity of loading at the bifurcation at the
critical parameters of stress and strain in the implementation of complex processes pre-critical
deformation of a circular cylindrical shell in the coordinate plane Э1 – Э3. The equations of the
relationship between stresses and strains in the construction of the image of the loading process
are accepted in accordance with the defining relations of the coplanarity hypothesis [1–3]. The
material parameters p and q of the approximations of the determining plasticity functions in the
theoretical construction of the image of the loading process are taken according to the principle
of the best approximation to the experimental data. Proposed innovative methods to solve
stability problems under complex loading trajectories of circles and circular arcs in the
direction of structural mechanics and solid mechanics implemented in the developed computer
program.
Keywords: computer program, stability, bifurcation, shell, complex loading, trajectory,
tension, deformation.
SIMULATION OF DIGITAL AUTOMATION OF SUBSTATIONS
FOR PROTECTION OF INTER-SUBSTATION LINES
Authors: V.V. Okuneva, K.B. Korneev, Yu.V. Kovaleva
Abstract: Power systems are currently complex power grids, including a large number
of substations and an extensive network of power transmission lines. These lines are key
components of networks and must be secured to ensure the integrity and reliability of the
system. The control and protection of equipment at the substation has evolved from manual
to hardware-automated, to dispatcher control and data acquisition with intelligent
electronic devices enabled, and finally now to digital automation. The current substation
automation standard adopted worldwide is International Electrotechnical Commission (IEC)
Standard 61850.
Keywords: digital substation, line protection, IEC 61850 standard, digital automation.
ELECTROMECHANICAL FLYWHEEL
WITH AN ARTIFICIAL (CAPACITIVE) MOMENT OF INERTIA
Authors: I.P. Popov
Abstract: The purpose of the study is to develop an artificial capacitive flywheel with the
ability to automatically control the moment of inertia. The device, which has an artificial moment
of inertia, can have a significantly low weight and be used instead of massive flywheels. The
device constructively can be made in the form of a direct current electric machine of independent
excitation or a valve electric machine, in the armature circuit of which a capacitor is included.
A mechanical device interacting with an electromagnetic flywheel, which has an artificial
moment of inertia, «does not distinguish» it from a flywheel with a «natural» moment of inertia,
while the idealized version of the former does not have gravitational mass. Artificial or capacitive
moment of inertia functionally depends on electromagnetic quantities – capacitance and magnetic
induction, which creates the possibility of its automatic regulation.
Keywords: mass, moment of inertia, electric machine, capacitor.
A NOTE ON THE CENTERS
OF S-SYMMETRY AND C-SYMMETRY OF A FLAT PLATE
Authors: Al.An. Shum
, A.M. Vetoshkin
, An.Al. Shum
Abstract: The concepts of s-symmetry and c-symmetry of a flat plate are studied.
A sufficient criterion is established for the coincidence of the center of c-symmetry of a flat
convex plate with the origin, which is an analogue of the previously obtained criterion for the
case of s-symmetry. An example of applying the new criterion is considered.
Keywords: symmetry, c-symmetry, s-symmetry, center of symmetry, half-mass line,
equilibrium line, density function, mass, center of mass, electric machine.
THE ENTHALPY OF FORMATION OF DIATOMIC ALCOHOLS.
NUMERICAL CALCULATIONS AND BASIC REGULARITIES
Authors: M.G. Vinogradova, R.R. Kozlova, T.A. Savelyeva
Abstract: The enthalpy of formation of fНº298(lg) diatomic alcohols is discussed.
Working formulas are derived, and their graph-theoretic interpretation is given. Numerical
calculations consistent with the experiment are carried out. New data have been obtained.
A number of regularities linking the enthalpy of formation with the structure of diatomic alcohols
have been established. It is found that the enthalpy of formation depends on the chain length,
branching diatomic alcohols and location of hydroxo groups.
Keywords: structure, education enthalpy, calculation methods
METHODS FOR ESTIMATING POLLUTION
OF BOTTOM SEDIMENTS WITH HEAVY METALS
Authors: G.N. Ivanov, I.V. Krivenko, M.A. Smirnova, S.R. Ispirian
Abstract: The paper deal with learning actual problem on-farm land management that is
estimating of the state of water bodies and the overall level of their technogenic load. It is noted
that one of the most objective and reliable indicators required for such estimating is the content
of heavy metals in the bottom sediments of a water body. We are systematized and described
various methods for estimating pollution of bottom sediments with heavy metals, which based
on the using the regional clarks of the content the elements in the soils and bottom sediments of
background and conditionally background territories. Methods for calculating various criteria
that reflect the degree of pollution the bottom sediments with heavy metals and conclusions
about environmental risks based on such calculations are presented and analyzed.
Keywords: land management, state of the water body, bottom sediments, heavy metals,
pollution degree of water bodies.
TEST SAMPLES FOR COMPUTER-AIDED TEST SYSTEM:
CHEMICAL ANALYSIS, MEASUREMENT TOOLS AND MATERIALS
Authors: I.A. Savrasov
Abstract: The issue of determining the chemical composition of samples used to study
the processes of complex deformation of materials at the automated test complex of the
MV-computer of the Tver State Technical University is being considered. For this purpose, gasvolume, titrimetric, gravimetric methods were used, which made it possible to evaluate the
chemical composition of samples and conclude the compliance of the steel 45 brand according to
GOST 1050-88.
Keywords: complex deformation of materials, titrimetric method, chemical composition,
dynamometer.